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11436 lines
287 KiB
11436 lines
287 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* NET3 Protocol independent device support routines. |
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* |
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* Derived from the non IP parts of dev.c 1.0.19 |
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* Authors: Ross Biro |
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* Fred N. van Kempen, <[email protected]> |
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* Mark Evans, <[email protected]> |
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* |
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* Additional Authors: |
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* Florian la Roche <[email protected]> |
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* Alan Cox <[email protected]> |
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* David Hinds <[email protected]> |
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* Alexey Kuznetsov <[email protected]> |
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* Adam Sulmicki <[email protected]> |
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* Pekka Riikonen <[email protected]> |
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* |
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* Changes: |
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* D.J. Barrow : Fixed bug where dev->refcnt gets set |
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* to 2 if register_netdev gets called |
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* before net_dev_init & also removed a |
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* few lines of code in the process. |
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* Alan Cox : device private ioctl copies fields back. |
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* Alan Cox : Transmit queue code does relevant |
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* stunts to keep the queue safe. |
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* Alan Cox : Fixed double lock. |
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* Alan Cox : Fixed promisc NULL pointer trap |
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* ???????? : Support the full private ioctl range |
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* Alan Cox : Moved ioctl permission check into |
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* drivers |
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* Tim Kordas : SIOCADDMULTI/SIOCDELMULTI |
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* Alan Cox : 100 backlog just doesn't cut it when |
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* you start doing multicast video 8) |
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* Alan Cox : Rewrote net_bh and list manager. |
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* Alan Cox : Fix ETH_P_ALL echoback lengths. |
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* Alan Cox : Took out transmit every packet pass |
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* Saved a few bytes in the ioctl handler |
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* Alan Cox : Network driver sets packet type before |
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* calling netif_rx. Saves a function |
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* call a packet. |
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* Alan Cox : Hashed net_bh() |
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* Richard Kooijman: Timestamp fixes. |
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* Alan Cox : Wrong field in SIOCGIFDSTADDR |
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* Alan Cox : Device lock protection. |
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* Alan Cox : Fixed nasty side effect of device close |
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* changes. |
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* Rudi Cilibrasi : Pass the right thing to |
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* set_mac_address() |
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* Dave Miller : 32bit quantity for the device lock to |
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* make it work out on a Sparc. |
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* Bjorn Ekwall : Added KERNELD hack. |
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* Alan Cox : Cleaned up the backlog initialise. |
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* Craig Metz : SIOCGIFCONF fix if space for under |
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* 1 device. |
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* Thomas Bogendoerfer : Return ENODEV for dev_open, if there |
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* is no device open function. |
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* Andi Kleen : Fix error reporting for SIOCGIFCONF |
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* Michael Chastain : Fix signed/unsigned for SIOCGIFCONF |
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* Cyrus Durgin : Cleaned for KMOD |
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* Adam Sulmicki : Bug Fix : Network Device Unload |
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* A network device unload needs to purge |
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* the backlog queue. |
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* Paul Rusty Russell : SIOCSIFNAME |
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* Pekka Riikonen : Netdev boot-time settings code |
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* Andrew Morton : Make unregister_netdevice wait |
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* indefinitely on dev->refcnt |
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* J Hadi Salim : - Backlog queue sampling |
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* - netif_rx() feedback |
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*/ |
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|
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#include <linux/uaccess.h> |
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#include <linux/bitops.h> |
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#include <linux/capability.h> |
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#include <linux/cpu.h> |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/hash.h> |
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#include <linux/slab.h> |
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#include <linux/sched.h> |
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#include <linux/sched/mm.h> |
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#include <linux/mutex.h> |
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#include <linux/rwsem.h> |
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#include <linux/string.h> |
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#include <linux/mm.h> |
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#include <linux/socket.h> |
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#include <linux/sockios.h> |
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#include <linux/errno.h> |
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#include <linux/interrupt.h> |
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#include <linux/if_ether.h> |
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#include <linux/netdevice.h> |
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#include <linux/etherdevice.h> |
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#include <linux/ethtool.h> |
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#include <linux/skbuff.h> |
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#include <linux/kthread.h> |
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#include <linux/bpf.h> |
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#include <linux/bpf_trace.h> |
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#include <net/net_namespace.h> |
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#include <net/sock.h> |
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#include <net/busy_poll.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/stat.h> |
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#include <net/dsa.h> |
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#include <net/dst.h> |
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#include <net/dst_metadata.h> |
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#include <net/gro.h> |
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#include <net/pkt_sched.h> |
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#include <net/pkt_cls.h> |
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#include <net/checksum.h> |
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#include <net/xfrm.h> |
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#include <linux/highmem.h> |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/netpoll.h> |
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#include <linux/rcupdate.h> |
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#include <linux/delay.h> |
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#include <net/iw_handler.h> |
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#include <asm/current.h> |
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#include <linux/audit.h> |
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#include <linux/dmaengine.h> |
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#include <linux/err.h> |
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#include <linux/ctype.h> |
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#include <linux/if_arp.h> |
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#include <linux/if_vlan.h> |
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#include <linux/ip.h> |
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#include <net/ip.h> |
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#include <net/mpls.h> |
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#include <linux/ipv6.h> |
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#include <linux/in.h> |
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#include <linux/jhash.h> |
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#include <linux/random.h> |
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#include <trace/events/napi.h> |
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#include <trace/events/net.h> |
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#include <trace/events/skb.h> |
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#include <trace/events/qdisc.h> |
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#include <linux/inetdevice.h> |
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#include <linux/cpu_rmap.h> |
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#include <linux/static_key.h> |
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#include <linux/hashtable.h> |
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#include <linux/vmalloc.h> |
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#include <linux/if_macvlan.h> |
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#include <linux/errqueue.h> |
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#include <linux/hrtimer.h> |
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#include <linux/netfilter_netdev.h> |
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#include <linux/crash_dump.h> |
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#include <linux/sctp.h> |
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#include <net/udp_tunnel.h> |
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#include <linux/net_namespace.h> |
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#include <linux/indirect_call_wrapper.h> |
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#include <net/devlink.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/prandom.h> |
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#include <linux/once_lite.h> |
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|
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#include "dev.h" |
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#include "net-sysfs.h" |
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static DEFINE_SPINLOCK(ptype_lock); |
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struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
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struct list_head ptype_all __read_mostly; /* Taps */ |
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static int netif_rx_internal(struct sk_buff *skb); |
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static int call_netdevice_notifiers_info(unsigned long val, |
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struct netdev_notifier_info *info); |
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static int call_netdevice_notifiers_extack(unsigned long val, |
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struct net_device *dev, |
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struct netlink_ext_ack *extack); |
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static struct napi_struct *napi_by_id(unsigned int napi_id); |
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|
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/* |
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* The @dev_base_head list is protected by @dev_base_lock and the rtnl |
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* semaphore. |
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* |
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* Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
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* |
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* Writers must hold the rtnl semaphore while they loop through the |
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* dev_base_head list, and hold dev_base_lock for writing when they do the |
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* actual updates. This allows pure readers to access the list even |
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* while a writer is preparing to update it. |
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* |
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* To put it another way, dev_base_lock is held for writing only to |
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* protect against pure readers; the rtnl semaphore provides the |
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* protection against other writers. |
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* |
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* See, for example usages, register_netdevice() and |
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* unregister_netdevice(), which must be called with the rtnl |
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* semaphore held. |
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*/ |
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DEFINE_RWLOCK(dev_base_lock); |
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EXPORT_SYMBOL(dev_base_lock); |
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|
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static DEFINE_MUTEX(ifalias_mutex); |
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|
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/* protects napi_hash addition/deletion and napi_gen_id */ |
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static DEFINE_SPINLOCK(napi_hash_lock); |
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static unsigned int napi_gen_id = NR_CPUS; |
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static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8); |
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static DECLARE_RWSEM(devnet_rename_sem); |
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static inline void dev_base_seq_inc(struct net *net) |
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{ |
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while (++net->dev_base_seq == 0) |
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; |
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} |
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static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
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{ |
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unsigned int hash = full_name_hash(net, name, strnlen(name, IFNAMSIZ)); |
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return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
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} |
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static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
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{ |
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return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
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} |
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static inline void rps_lock_irqsave(struct softnet_data *sd, |
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unsigned long *flags) |
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{ |
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if (IS_ENABLED(CONFIG_RPS)) |
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spin_lock_irqsave(&sd->input_pkt_queue.lock, *flags); |
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else if (!IS_ENABLED(CONFIG_PREEMPT_RT)) |
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local_irq_save(*flags); |
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} |
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static inline void rps_lock_irq_disable(struct softnet_data *sd) |
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{ |
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if (IS_ENABLED(CONFIG_RPS)) |
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spin_lock_irq(&sd->input_pkt_queue.lock); |
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else if (!IS_ENABLED(CONFIG_PREEMPT_RT)) |
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local_irq_disable(); |
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} |
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static inline void rps_unlock_irq_restore(struct softnet_data *sd, |
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unsigned long *flags) |
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{ |
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if (IS_ENABLED(CONFIG_RPS)) |
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spin_unlock_irqrestore(&sd->input_pkt_queue.lock, *flags); |
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else if (!IS_ENABLED(CONFIG_PREEMPT_RT)) |
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local_irq_restore(*flags); |
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} |
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static inline void rps_unlock_irq_enable(struct softnet_data *sd) |
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{ |
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if (IS_ENABLED(CONFIG_RPS)) |
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spin_unlock_irq(&sd->input_pkt_queue.lock); |
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else if (!IS_ENABLED(CONFIG_PREEMPT_RT)) |
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local_irq_enable(); |
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} |
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static struct netdev_name_node *netdev_name_node_alloc(struct net_device *dev, |
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const char *name) |
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{ |
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struct netdev_name_node *name_node; |
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name_node = kmalloc(sizeof(*name_node), GFP_KERNEL); |
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if (!name_node) |
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return NULL; |
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INIT_HLIST_NODE(&name_node->hlist); |
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name_node->dev = dev; |
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name_node->name = name; |
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return name_node; |
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} |
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static struct netdev_name_node * |
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netdev_name_node_head_alloc(struct net_device *dev) |
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{ |
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struct netdev_name_node *name_node; |
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name_node = netdev_name_node_alloc(dev, dev->name); |
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if (!name_node) |
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return NULL; |
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INIT_LIST_HEAD(&name_node->list); |
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return name_node; |
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} |
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static void netdev_name_node_free(struct netdev_name_node *name_node) |
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{ |
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kfree(name_node); |
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} |
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static void netdev_name_node_add(struct net *net, |
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struct netdev_name_node *name_node) |
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{ |
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hlist_add_head_rcu(&name_node->hlist, |
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dev_name_hash(net, name_node->name)); |
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} |
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static void netdev_name_node_del(struct netdev_name_node *name_node) |
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{ |
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hlist_del_rcu(&name_node->hlist); |
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} |
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static struct netdev_name_node *netdev_name_node_lookup(struct net *net, |
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const char *name) |
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{ |
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struct hlist_head *head = dev_name_hash(net, name); |
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struct netdev_name_node *name_node; |
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hlist_for_each_entry(name_node, head, hlist) |
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if (!strcmp(name_node->name, name)) |
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return name_node; |
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return NULL; |
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} |
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static struct netdev_name_node *netdev_name_node_lookup_rcu(struct net *net, |
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const char *name) |
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{ |
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struct hlist_head *head = dev_name_hash(net, name); |
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struct netdev_name_node *name_node; |
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hlist_for_each_entry_rcu(name_node, head, hlist) |
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if (!strcmp(name_node->name, name)) |
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return name_node; |
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return NULL; |
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} |
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bool netdev_name_in_use(struct net *net, const char *name) |
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{ |
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return netdev_name_node_lookup(net, name); |
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} |
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EXPORT_SYMBOL(netdev_name_in_use); |
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int netdev_name_node_alt_create(struct net_device *dev, const char *name) |
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{ |
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struct netdev_name_node *name_node; |
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struct net *net = dev_net(dev); |
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name_node = netdev_name_node_lookup(net, name); |
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if (name_node) |
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return -EEXIST; |
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name_node = netdev_name_node_alloc(dev, name); |
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if (!name_node) |
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return -ENOMEM; |
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netdev_name_node_add(net, name_node); |
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/* The node that holds dev->name acts as a head of per-device list. */ |
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list_add_tail(&name_node->list, &dev->name_node->list); |
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return 0; |
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} |
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static void __netdev_name_node_alt_destroy(struct netdev_name_node *name_node) |
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{ |
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list_del(&name_node->list); |
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netdev_name_node_del(name_node); |
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kfree(name_node->name); |
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netdev_name_node_free(name_node); |
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} |
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int netdev_name_node_alt_destroy(struct net_device *dev, const char *name) |
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{ |
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struct netdev_name_node *name_node; |
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struct net *net = dev_net(dev); |
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name_node = netdev_name_node_lookup(net, name); |
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if (!name_node) |
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return -ENOENT; |
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/* lookup might have found our primary name or a name belonging |
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* to another device. |
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*/ |
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if (name_node == dev->name_node || name_node->dev != dev) |
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return -EINVAL; |
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__netdev_name_node_alt_destroy(name_node); |
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return 0; |
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} |
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static void netdev_name_node_alt_flush(struct net_device *dev) |
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{ |
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struct netdev_name_node *name_node, *tmp; |
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list_for_each_entry_safe(name_node, tmp, &dev->name_node->list, list) |
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__netdev_name_node_alt_destroy(name_node); |
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} |
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/* Device list insertion */ |
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static void list_netdevice(struct net_device *dev) |
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{ |
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struct net *net = dev_net(dev); |
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ASSERT_RTNL(); |
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write_lock(&dev_base_lock); |
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list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
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netdev_name_node_add(net, dev->name_node); |
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hlist_add_head_rcu(&dev->index_hlist, |
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dev_index_hash(net, dev->ifindex)); |
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write_unlock(&dev_base_lock); |
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dev_base_seq_inc(net); |
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} |
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/* Device list removal |
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* caller must respect a RCU grace period before freeing/reusing dev |
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*/ |
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static void unlist_netdevice(struct net_device *dev, bool lock) |
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{ |
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ASSERT_RTNL(); |
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|
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/* Unlink dev from the device chain */ |
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if (lock) |
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write_lock(&dev_base_lock); |
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list_del_rcu(&dev->dev_list); |
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netdev_name_node_del(dev->name_node); |
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hlist_del_rcu(&dev->index_hlist); |
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if (lock) |
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write_unlock(&dev_base_lock); |
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dev_base_seq_inc(dev_net(dev)); |
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} |
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|
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/* |
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* Our notifier list |
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*/ |
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static RAW_NOTIFIER_HEAD(netdev_chain); |
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|
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/* |
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* Device drivers call our routines to queue packets here. We empty the |
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* queue in the local softnet handler. |
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*/ |
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|
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DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
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EXPORT_PER_CPU_SYMBOL(softnet_data); |
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#ifdef CONFIG_LOCKDEP |
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/* |
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* register_netdevice() inits txq->_xmit_lock and sets lockdep class |
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* according to dev->type |
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*/ |
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static const unsigned short netdev_lock_type[] = { |
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ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, |
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ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, |
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ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, |
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ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, |
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ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, |
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ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, |
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ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, |
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ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, |
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ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, |
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ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, |
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ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, |
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ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, |
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ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM, |
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ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE, |
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ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE}; |
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|
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static const char *const netdev_lock_name[] = { |
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"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", |
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"_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", |
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"_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", |
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"_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", |
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"_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", |
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"_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", |
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"_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", |
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"_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", |
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"_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", |
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"_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", |
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"_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", |
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"_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", |
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"_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM", |
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"_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE", |
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"_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"}; |
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|
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static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
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static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
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|
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static inline unsigned short netdev_lock_pos(unsigned short dev_type) |
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{ |
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int i; |
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|
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for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) |
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if (netdev_lock_type[i] == dev_type) |
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return i; |
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/* the last key is used by default */ |
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return ARRAY_SIZE(netdev_lock_type) - 1; |
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} |
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|
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static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
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unsigned short dev_type) |
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{ |
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int i; |
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|
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i = netdev_lock_pos(dev_type); |
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lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], |
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netdev_lock_name[i]); |
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} |
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|
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static inline void netdev_set_addr_lockdep_class(struct net_device *dev) |
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{ |
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int i; |
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|
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i = netdev_lock_pos(dev->type); |
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lockdep_set_class_and_name(&dev->addr_list_lock, |
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&netdev_addr_lock_key[i], |
|
netdev_lock_name[i]); |
|
} |
|
#else |
|
static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
|
unsigned short dev_type) |
|
{ |
|
} |
|
|
|
static inline void netdev_set_addr_lockdep_class(struct net_device *dev) |
|
{ |
|
} |
|
#endif |
|
|
|
/******************************************************************************* |
|
* |
|
* Protocol management and registration routines |
|
* |
|
*******************************************************************************/ |
|
|
|
|
|
/* |
|
* Add a protocol ID to the list. Now that the input handler is |
|
* smarter we can dispense with all the messy stuff that used to be |
|
* here. |
|
* |
|
* BEWARE!!! Protocol handlers, mangling input packets, |
|
* MUST BE last in hash buckets and checking protocol handlers |
|
* MUST start from promiscuous ptype_all chain in net_bh. |
|
* It is true now, do not change it. |
|
* Explanation follows: if protocol handler, mangling packet, will |
|
* be the first on list, it is not able to sense, that packet |
|
* is cloned and should be copied-on-write, so that it will |
|
* change it and subsequent readers will get broken packet. |
|
* --ANK (980803) |
|
*/ |
|
|
|
static inline struct list_head *ptype_head(const struct packet_type *pt) |
|
{ |
|
if (pt->type == htons(ETH_P_ALL)) |
|
return pt->dev ? &pt->dev->ptype_all : &ptype_all; |
|
else |
|
return pt->dev ? &pt->dev->ptype_specific : |
|
&ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; |
|
} |
|
|
|
/** |
|
* dev_add_pack - add packet handler |
|
* @pt: packet type declaration |
|
* |
|
* Add a protocol handler to the networking stack. The passed &packet_type |
|
* is linked into kernel lists and may not be freed until it has been |
|
* removed from the kernel lists. |
|
* |
|
* This call does not sleep therefore it can not |
|
* guarantee all CPU's that are in middle of receiving packets |
|
* will see the new packet type (until the next received packet). |
|
*/ |
|
|
|
void dev_add_pack(struct packet_type *pt) |
|
{ |
|
struct list_head *head = ptype_head(pt); |
|
|
|
spin_lock(&ptype_lock); |
|
list_add_rcu(&pt->list, head); |
|
spin_unlock(&ptype_lock); |
|
} |
|
EXPORT_SYMBOL(dev_add_pack); |
|
|
|
/** |
|
* __dev_remove_pack - remove packet handler |
|
* @pt: packet type declaration |
|
* |
|
* Remove a protocol handler that was previously added to the kernel |
|
* protocol handlers by dev_add_pack(). The passed &packet_type is removed |
|
* from the kernel lists and can be freed or reused once this function |
|
* returns. |
|
* |
|
* The packet type might still be in use by receivers |
|
* and must not be freed until after all the CPU's have gone |
|
* through a quiescent state. |
|
*/ |
|
void __dev_remove_pack(struct packet_type *pt) |
|
{ |
|
struct list_head *head = ptype_head(pt); |
|
struct packet_type *pt1; |
|
|
|
spin_lock(&ptype_lock); |
|
|
|
list_for_each_entry(pt1, head, list) { |
|
if (pt == pt1) { |
|
list_del_rcu(&pt->list); |
|
goto out; |
|
} |
|
} |
|
|
|
pr_warn("dev_remove_pack: %p not found\n", pt); |
|
out: |
|
spin_unlock(&ptype_lock); |
|
} |
|
EXPORT_SYMBOL(__dev_remove_pack); |
|
|
|
/** |
|
* dev_remove_pack - remove packet handler |
|
* @pt: packet type declaration |
|
* |
|
* Remove a protocol handler that was previously added to the kernel |
|
* protocol handlers by dev_add_pack(). The passed &packet_type is removed |
|
* from the kernel lists and can be freed or reused once this function |
|
* returns. |
|
* |
|
* This call sleeps to guarantee that no CPU is looking at the packet |
|
* type after return. |
|
*/ |
|
void dev_remove_pack(struct packet_type *pt) |
|
{ |
|
__dev_remove_pack(pt); |
|
|
|
synchronize_net(); |
|
} |
|
EXPORT_SYMBOL(dev_remove_pack); |
|
|
|
|
|
/******************************************************************************* |
|
* |
|
* Device Interface Subroutines |
|
* |
|
*******************************************************************************/ |
|
|
|
/** |
|
* dev_get_iflink - get 'iflink' value of a interface |
|
* @dev: targeted interface |
|
* |
|
* Indicates the ifindex the interface is linked to. |
|
* Physical interfaces have the same 'ifindex' and 'iflink' values. |
|
*/ |
|
|
|
int dev_get_iflink(const struct net_device *dev) |
|
{ |
|
if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink) |
|
return dev->netdev_ops->ndo_get_iflink(dev); |
|
|
|
return dev->ifindex; |
|
} |
|
EXPORT_SYMBOL(dev_get_iflink); |
|
|
|
/** |
|
* dev_fill_metadata_dst - Retrieve tunnel egress information. |
|
* @dev: targeted interface |
|
* @skb: The packet. |
|
* |
|
* For better visibility of tunnel traffic OVS needs to retrieve |
|
* egress tunnel information for a packet. Following API allows |
|
* user to get this info. |
|
*/ |
|
int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) |
|
{ |
|
struct ip_tunnel_info *info; |
|
|
|
if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst) |
|
return -EINVAL; |
|
|
|
info = skb_tunnel_info_unclone(skb); |
|
if (!info) |
|
return -ENOMEM; |
|
if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX))) |
|
return -EINVAL; |
|
|
|
return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb); |
|
} |
|
EXPORT_SYMBOL_GPL(dev_fill_metadata_dst); |
|
|
|
static struct net_device_path *dev_fwd_path(struct net_device_path_stack *stack) |
|
{ |
|
int k = stack->num_paths++; |
|
|
|
if (WARN_ON_ONCE(k >= NET_DEVICE_PATH_STACK_MAX)) |
|
return NULL; |
|
|
|
return &stack->path[k]; |
|
} |
|
|
|
int dev_fill_forward_path(const struct net_device *dev, const u8 *daddr, |
|
struct net_device_path_stack *stack) |
|
{ |
|
const struct net_device *last_dev; |
|
struct net_device_path_ctx ctx = { |
|
.dev = dev, |
|
}; |
|
struct net_device_path *path; |
|
int ret = 0; |
|
|
|
memcpy(ctx.daddr, daddr, sizeof(ctx.daddr)); |
|
stack->num_paths = 0; |
|
while (ctx.dev && ctx.dev->netdev_ops->ndo_fill_forward_path) { |
|
last_dev = ctx.dev; |
|
path = dev_fwd_path(stack); |
|
if (!path) |
|
return -1; |
|
|
|
memset(path, 0, sizeof(struct net_device_path)); |
|
ret = ctx.dev->netdev_ops->ndo_fill_forward_path(&ctx, path); |
|
if (ret < 0) |
|
return -1; |
|
|
|
if (WARN_ON_ONCE(last_dev == ctx.dev)) |
|
return -1; |
|
} |
|
|
|
if (!ctx.dev) |
|
return ret; |
|
|
|
path = dev_fwd_path(stack); |
|
if (!path) |
|
return -1; |
|
path->type = DEV_PATH_ETHERNET; |
|
path->dev = ctx.dev; |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(dev_fill_forward_path); |
|
|
|
/** |
|
* __dev_get_by_name - find a device by its name |
|
* @net: the applicable net namespace |
|
* @name: name to find |
|
* |
|
* Find an interface by name. Must be called under RTNL semaphore |
|
* or @dev_base_lock. If the name is found a pointer to the device |
|
* is returned. If the name is not found then %NULL is returned. The |
|
* reference counters are not incremented so the caller must be |
|
* careful with locks. |
|
*/ |
|
|
|
struct net_device *__dev_get_by_name(struct net *net, const char *name) |
|
{ |
|
struct netdev_name_node *node_name; |
|
|
|
node_name = netdev_name_node_lookup(net, name); |
|
return node_name ? node_name->dev : NULL; |
|
} |
|
EXPORT_SYMBOL(__dev_get_by_name); |
|
|
|
/** |
|
* dev_get_by_name_rcu - find a device by its name |
|
* @net: the applicable net namespace |
|
* @name: name to find |
|
* |
|
* Find an interface by name. |
|
* If the name is found a pointer to the device is returned. |
|
* If the name is not found then %NULL is returned. |
|
* The reference counters are not incremented so the caller must be |
|
* careful with locks. The caller must hold RCU lock. |
|
*/ |
|
|
|
struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) |
|
{ |
|
struct netdev_name_node *node_name; |
|
|
|
node_name = netdev_name_node_lookup_rcu(net, name); |
|
return node_name ? node_name->dev : NULL; |
|
} |
|
EXPORT_SYMBOL(dev_get_by_name_rcu); |
|
|
|
/** |
|
* dev_get_by_name - find a device by its name |
|
* @net: the applicable net namespace |
|
* @name: name to find |
|
* |
|
* Find an interface by name. This can be called from any |
|
* context and does its own locking. The returned handle has |
|
* the usage count incremented and the caller must use dev_put() to |
|
* release it when it is no longer needed. %NULL is returned if no |
|
* matching device is found. |
|
*/ |
|
|
|
struct net_device *dev_get_by_name(struct net *net, const char *name) |
|
{ |
|
struct net_device *dev; |
|
|
|
rcu_read_lock(); |
|
dev = dev_get_by_name_rcu(net, name); |
|
dev_hold(dev); |
|
rcu_read_unlock(); |
|
return dev; |
|
} |
|
EXPORT_SYMBOL(dev_get_by_name); |
|
|
|
/** |
|
* __dev_get_by_index - find a device by its ifindex |
|
* @net: the applicable net namespace |
|
* @ifindex: index of device |
|
* |
|
* Search for an interface by index. Returns %NULL if the device |
|
* is not found or a pointer to the device. The device has not |
|
* had its reference counter increased so the caller must be careful |
|
* about locking. The caller must hold either the RTNL semaphore |
|
* or @dev_base_lock. |
|
*/ |
|
|
|
struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
|
{ |
|
struct net_device *dev; |
|
struct hlist_head *head = dev_index_hash(net, ifindex); |
|
|
|
hlist_for_each_entry(dev, head, index_hlist) |
|
if (dev->ifindex == ifindex) |
|
return dev; |
|
|
|
return NULL; |
|
} |
|
EXPORT_SYMBOL(__dev_get_by_index); |
|
|
|
/** |
|
* dev_get_by_index_rcu - find a device by its ifindex |
|
* @net: the applicable net namespace |
|
* @ifindex: index of device |
|
* |
|
* Search for an interface by index. Returns %NULL if the device |
|
* is not found or a pointer to the device. The device has not |
|
* had its reference counter increased so the caller must be careful |
|
* about locking. The caller must hold RCU lock. |
|
*/ |
|
|
|
struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) |
|
{ |
|
struct net_device *dev; |
|
struct hlist_head *head = dev_index_hash(net, ifindex); |
|
|
|
hlist_for_each_entry_rcu(dev, head, index_hlist) |
|
if (dev->ifindex == ifindex) |
|
return dev; |
|
|
|
return NULL; |
|
} |
|
EXPORT_SYMBOL(dev_get_by_index_rcu); |
|
|
|
|
|
/** |
|
* dev_get_by_index - find a device by its ifindex |
|
* @net: the applicable net namespace |
|
* @ifindex: index of device |
|
* |
|
* Search for an interface by index. Returns NULL if the device |
|
* is not found or a pointer to the device. The device returned has |
|
* had a reference added and the pointer is safe until the user calls |
|
* dev_put to indicate they have finished with it. |
|
*/ |
|
|
|
struct net_device *dev_get_by_index(struct net *net, int ifindex) |
|
{ |
|
struct net_device *dev; |
|
|
|
rcu_read_lock(); |
|
dev = dev_get_by_index_rcu(net, ifindex); |
|
dev_hold(dev); |
|
rcu_read_unlock(); |
|
return dev; |
|
} |
|
EXPORT_SYMBOL(dev_get_by_index); |
|
|
|
/** |
|
* dev_get_by_napi_id - find a device by napi_id |
|
* @napi_id: ID of the NAPI struct |
|
* |
|
* Search for an interface by NAPI ID. Returns %NULL if the device |
|
* is not found or a pointer to the device. The device has not had |
|
* its reference counter increased so the caller must be careful |
|
* about locking. The caller must hold RCU lock. |
|
*/ |
|
|
|
struct net_device *dev_get_by_napi_id(unsigned int napi_id) |
|
{ |
|
struct napi_struct *napi; |
|
|
|
WARN_ON_ONCE(!rcu_read_lock_held()); |
|
|
|
if (napi_id < MIN_NAPI_ID) |
|
return NULL; |
|
|
|
napi = napi_by_id(napi_id); |
|
|
|
return napi ? napi->dev : NULL; |
|
} |
|
EXPORT_SYMBOL(dev_get_by_napi_id); |
|
|
|
/** |
|
* netdev_get_name - get a netdevice name, knowing its ifindex. |
|
* @net: network namespace |
|
* @name: a pointer to the buffer where the name will be stored. |
|
* @ifindex: the ifindex of the interface to get the name from. |
|
*/ |
|
int netdev_get_name(struct net *net, char *name, int ifindex) |
|
{ |
|
struct net_device *dev; |
|
int ret; |
|
|
|
down_read(&devnet_rename_sem); |
|
rcu_read_lock(); |
|
|
|
dev = dev_get_by_index_rcu(net, ifindex); |
|
if (!dev) { |
|
ret = -ENODEV; |
|
goto out; |
|
} |
|
|
|
strcpy(name, dev->name); |
|
|
|
ret = 0; |
|
out: |
|
rcu_read_unlock(); |
|
up_read(&devnet_rename_sem); |
|
return ret; |
|
} |
|
|
|
/** |
|
* dev_getbyhwaddr_rcu - find a device by its hardware address |
|
* @net: the applicable net namespace |
|
* @type: media type of device |
|
* @ha: hardware address |
|
* |
|
* Search for an interface by MAC address. Returns NULL if the device |
|
* is not found or a pointer to the device. |
|
* The caller must hold RCU or RTNL. |
|
* The returned device has not had its ref count increased |
|
* and the caller must therefore be careful about locking |
|
* |
|
*/ |
|
|
|
struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
|
const char *ha) |
|
{ |
|
struct net_device *dev; |
|
|
|
for_each_netdev_rcu(net, dev) |
|
if (dev->type == type && |
|
!memcmp(dev->dev_addr, ha, dev->addr_len)) |
|
return dev; |
|
|
|
return NULL; |
|
} |
|
EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
|
|
|
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
|
{ |
|
struct net_device *dev, *ret = NULL; |
|
|
|
rcu_read_lock(); |
|
for_each_netdev_rcu(net, dev) |
|
if (dev->type == type) { |
|
dev_hold(dev); |
|
ret = dev; |
|
break; |
|
} |
|
rcu_read_unlock(); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(dev_getfirstbyhwtype); |
|
|
|
/** |
|
* __dev_get_by_flags - find any device with given flags |
|
* @net: the applicable net namespace |
|
* @if_flags: IFF_* values |
|
* @mask: bitmask of bits in if_flags to check |
|
* |
|
* Search for any interface with the given flags. Returns NULL if a device |
|
* is not found or a pointer to the device. Must be called inside |
|
* rtnl_lock(), and result refcount is unchanged. |
|
*/ |
|
|
|
struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags, |
|
unsigned short mask) |
|
{ |
|
struct net_device *dev, *ret; |
|
|
|
ASSERT_RTNL(); |
|
|
|
ret = NULL; |
|
for_each_netdev(net, dev) { |
|
if (((dev->flags ^ if_flags) & mask) == 0) { |
|
ret = dev; |
|
break; |
|
} |
|
} |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(__dev_get_by_flags); |
|
|
|
/** |
|
* dev_valid_name - check if name is okay for network device |
|
* @name: name string |
|
* |
|
* Network device names need to be valid file names to |
|
* allow sysfs to work. We also disallow any kind of |
|
* whitespace. |
|
*/ |
|
bool dev_valid_name(const char *name) |
|
{ |
|
if (*name == '\0') |
|
return false; |
|
if (strnlen(name, IFNAMSIZ) == IFNAMSIZ) |
|
return false; |
|
if (!strcmp(name, ".") || !strcmp(name, "..")) |
|
return false; |
|
|
|
while (*name) { |
|
if (*name == '/' || *name == ':' || isspace(*name)) |
|
return false; |
|
name++; |
|
} |
|
return true; |
|
} |
|
EXPORT_SYMBOL(dev_valid_name); |
|
|
|
/** |
|
* __dev_alloc_name - allocate a name for a device |
|
* @net: network namespace to allocate the device name in |
|
* @name: name format string |
|
* @buf: scratch buffer and result name string |
|
* |
|
* Passed a format string - eg "lt%d" it will try and find a suitable |
|
* id. It scans list of devices to build up a free map, then chooses |
|
* the first empty slot. The caller must hold the dev_base or rtnl lock |
|
* while allocating the name and adding the device in order to avoid |
|
* duplicates. |
|
* Limited to bits_per_byte * page size devices (ie 32K on most platforms). |
|
* Returns the number of the unit assigned or a negative errno code. |
|
*/ |
|
|
|
static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
|
{ |
|
int i = 0; |
|
const char *p; |
|
const int max_netdevices = 8*PAGE_SIZE; |
|
unsigned long *inuse; |
|
struct net_device *d; |
|
|
|
if (!dev_valid_name(name)) |
|
return -EINVAL; |
|
|
|
p = strchr(name, '%'); |
|
if (p) { |
|
/* |
|
* Verify the string as this thing may have come from |
|
* the user. There must be either one "%d" and no other "%" |
|
* characters. |
|
*/ |
|
if (p[1] != 'd' || strchr(p + 2, '%')) |
|
return -EINVAL; |
|
|
|
/* Use one page as a bit array of possible slots */ |
|
inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
|
if (!inuse) |
|
return -ENOMEM; |
|
|
|
for_each_netdev(net, d) { |
|
struct netdev_name_node *name_node; |
|
list_for_each_entry(name_node, &d->name_node->list, list) { |
|
if (!sscanf(name_node->name, name, &i)) |
|
continue; |
|
if (i < 0 || i >= max_netdevices) |
|
continue; |
|
|
|
/* avoid cases where sscanf is not exact inverse of printf */ |
|
snprintf(buf, IFNAMSIZ, name, i); |
|
if (!strncmp(buf, name_node->name, IFNAMSIZ)) |
|
__set_bit(i, inuse); |
|
} |
|
if (!sscanf(d->name, name, &i)) |
|
continue; |
|
if (i < 0 || i >= max_netdevices) |
|
continue; |
|
|
|
/* avoid cases where sscanf is not exact inverse of printf */ |
|
snprintf(buf, IFNAMSIZ, name, i); |
|
if (!strncmp(buf, d->name, IFNAMSIZ)) |
|
__set_bit(i, inuse); |
|
} |
|
|
|
i = find_first_zero_bit(inuse, max_netdevices); |
|
free_page((unsigned long) inuse); |
|
} |
|
|
|
snprintf(buf, IFNAMSIZ, name, i); |
|
if (!netdev_name_in_use(net, buf)) |
|
return i; |
|
|
|
/* It is possible to run out of possible slots |
|
* when the name is long and there isn't enough space left |
|
* for the digits, or if all bits are used. |
|
*/ |
|
return -ENFILE; |
|
} |
|
|
|
static int dev_alloc_name_ns(struct net *net, |
|
struct net_device *dev, |
|
const char *name) |
|
{ |
|
char buf[IFNAMSIZ]; |
|
int ret; |
|
|
|
BUG_ON(!net); |
|
ret = __dev_alloc_name(net, name, buf); |
|
if (ret >= 0) |
|
strscpy(dev->name, buf, IFNAMSIZ); |
|
return ret; |
|
} |
|
|
|
/** |
|
* dev_alloc_name - allocate a name for a device |
|
* @dev: device |
|
* @name: name format string |
|
* |
|
* Passed a format string - eg "lt%d" it will try and find a suitable |
|
* id. It scans list of devices to build up a free map, then chooses |
|
* the first empty slot. The caller must hold the dev_base or rtnl lock |
|
* while allocating the name and adding the device in order to avoid |
|
* duplicates. |
|
* Limited to bits_per_byte * page size devices (ie 32K on most platforms). |
|
* Returns the number of the unit assigned or a negative errno code. |
|
*/ |
|
|
|
int dev_alloc_name(struct net_device *dev, const char *name) |
|
{ |
|
return dev_alloc_name_ns(dev_net(dev), dev, name); |
|
} |
|
EXPORT_SYMBOL(dev_alloc_name); |
|
|
|
static int dev_get_valid_name(struct net *net, struct net_device *dev, |
|
const char *name) |
|
{ |
|
BUG_ON(!net); |
|
|
|
if (!dev_valid_name(name)) |
|
return -EINVAL; |
|
|
|
if (strchr(name, '%')) |
|
return dev_alloc_name_ns(net, dev, name); |
|
else if (netdev_name_in_use(net, name)) |
|
return -EEXIST; |
|
else if (dev->name != name) |
|
strscpy(dev->name, name, IFNAMSIZ); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* dev_change_name - change name of a device |
|
* @dev: device |
|
* @newname: name (or format string) must be at least IFNAMSIZ |
|
* |
|
* Change name of a device, can pass format strings "eth%d". |
|
* for wildcarding. |
|
*/ |
|
int dev_change_name(struct net_device *dev, const char *newname) |
|
{ |
|
unsigned char old_assign_type; |
|
char oldname[IFNAMSIZ]; |
|
int err = 0; |
|
int ret; |
|
struct net *net; |
|
|
|
ASSERT_RTNL(); |
|
BUG_ON(!dev_net(dev)); |
|
|
|
net = dev_net(dev); |
|
|
|
/* Some auto-enslaved devices e.g. failover slaves are |
|
* special, as userspace might rename the device after |
|
* the interface had been brought up and running since |
|
* the point kernel initiated auto-enslavement. Allow |
|
* live name change even when these slave devices are |
|
* up and running. |
|
* |
|
* Typically, users of these auto-enslaving devices |
|
* don't actually care about slave name change, as |
|
* they are supposed to operate on master interface |
|
* directly. |
|
*/ |
|
if (dev->flags & IFF_UP && |
|
likely(!(dev->priv_flags & IFF_LIVE_RENAME_OK))) |
|
return -EBUSY; |
|
|
|
down_write(&devnet_rename_sem); |
|
|
|
if (strncmp(newname, dev->name, IFNAMSIZ) == 0) { |
|
up_write(&devnet_rename_sem); |
|
return 0; |
|
} |
|
|
|
memcpy(oldname, dev->name, IFNAMSIZ); |
|
|
|
err = dev_get_valid_name(net, dev, newname); |
|
if (err < 0) { |
|
up_write(&devnet_rename_sem); |
|
return err; |
|
} |
|
|
|
if (oldname[0] && !strchr(oldname, '%')) |
|
netdev_info(dev, "renamed from %s\n", oldname); |
|
|
|
old_assign_type = dev->name_assign_type; |
|
dev->name_assign_type = NET_NAME_RENAMED; |
|
|
|
rollback: |
|
ret = device_rename(&dev->dev, dev->name); |
|
if (ret) { |
|
memcpy(dev->name, oldname, IFNAMSIZ); |
|
dev->name_assign_type = old_assign_type; |
|
up_write(&devnet_rename_sem); |
|
return ret; |
|
} |
|
|
|
up_write(&devnet_rename_sem); |
|
|
|
netdev_adjacent_rename_links(dev, oldname); |
|
|
|
write_lock(&dev_base_lock); |
|
netdev_name_node_del(dev->name_node); |
|
write_unlock(&dev_base_lock); |
|
|
|
synchronize_rcu(); |
|
|
|
write_lock(&dev_base_lock); |
|
netdev_name_node_add(net, dev->name_node); |
|
write_unlock(&dev_base_lock); |
|
|
|
ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
|
ret = notifier_to_errno(ret); |
|
|
|
if (ret) { |
|
/* err >= 0 after dev_alloc_name() or stores the first errno */ |
|
if (err >= 0) { |
|
err = ret; |
|
down_write(&devnet_rename_sem); |
|
memcpy(dev->name, oldname, IFNAMSIZ); |
|
memcpy(oldname, newname, IFNAMSIZ); |
|
dev->name_assign_type = old_assign_type; |
|
old_assign_type = NET_NAME_RENAMED; |
|
goto rollback; |
|
} else { |
|
netdev_err(dev, "name change rollback failed: %d\n", |
|
ret); |
|
} |
|
} |
|
|
|
return err; |
|
} |
|
|
|
/** |
|
* dev_set_alias - change ifalias of a device |
|
* @dev: device |
|
* @alias: name up to IFALIASZ |
|
* @len: limit of bytes to copy from info |
|
* |
|
* Set ifalias for a device, |
|
*/ |
|
int dev_set_alias(struct net_device *dev, const char *alias, size_t len) |
|
{ |
|
struct dev_ifalias *new_alias = NULL; |
|
|
|
if (len >= IFALIASZ) |
|
return -EINVAL; |
|
|
|
if (len) { |
|
new_alias = kmalloc(sizeof(*new_alias) + len + 1, GFP_KERNEL); |
|
if (!new_alias) |
|
return -ENOMEM; |
|
|
|
memcpy(new_alias->ifalias, alias, len); |
|
new_alias->ifalias[len] = 0; |
|
} |
|
|
|
mutex_lock(&ifalias_mutex); |
|
new_alias = rcu_replace_pointer(dev->ifalias, new_alias, |
|
mutex_is_locked(&ifalias_mutex)); |
|
mutex_unlock(&ifalias_mutex); |
|
|
|
if (new_alias) |
|
kfree_rcu(new_alias, rcuhead); |
|
|
|
return len; |
|
} |
|
EXPORT_SYMBOL(dev_set_alias); |
|
|
|
/** |
|
* dev_get_alias - get ifalias of a device |
|
* @dev: device |
|
* @name: buffer to store name of ifalias |
|
* @len: size of buffer |
|
* |
|
* get ifalias for a device. Caller must make sure dev cannot go |
|
* away, e.g. rcu read lock or own a reference count to device. |
|
*/ |
|
int dev_get_alias(const struct net_device *dev, char *name, size_t len) |
|
{ |
|
const struct dev_ifalias *alias; |
|
int ret = 0; |
|
|
|
rcu_read_lock(); |
|
alias = rcu_dereference(dev->ifalias); |
|
if (alias) |
|
ret = snprintf(name, len, "%s", alias->ifalias); |
|
rcu_read_unlock(); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* netdev_features_change - device changes features |
|
* @dev: device to cause notification |
|
* |
|
* Called to indicate a device has changed features. |
|
*/ |
|
void netdev_features_change(struct net_device *dev) |
|
{ |
|
call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
|
} |
|
EXPORT_SYMBOL(netdev_features_change); |
|
|
|
/** |
|
* netdev_state_change - device changes state |
|
* @dev: device to cause notification |
|
* |
|
* Called to indicate a device has changed state. This function calls |
|
* the notifier chains for netdev_chain and sends a NEWLINK message |
|
* to the routing socket. |
|
*/ |
|
void netdev_state_change(struct net_device *dev) |
|
{ |
|
if (dev->flags & IFF_UP) { |
|
struct netdev_notifier_change_info change_info = { |
|
.info.dev = dev, |
|
}; |
|
|
|
call_netdevice_notifiers_info(NETDEV_CHANGE, |
|
&change_info.info); |
|
rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL); |
|
} |
|
} |
|
EXPORT_SYMBOL(netdev_state_change); |
|
|
|
/** |
|
* __netdev_notify_peers - notify network peers about existence of @dev, |
|
* to be called when rtnl lock is already held. |
|
* @dev: network device |
|
* |
|
* Generate traffic such that interested network peers are aware of |
|
* @dev, such as by generating a gratuitous ARP. This may be used when |
|
* a device wants to inform the rest of the network about some sort of |
|
* reconfiguration such as a failover event or virtual machine |
|
* migration. |
|
*/ |
|
void __netdev_notify_peers(struct net_device *dev) |
|
{ |
|
ASSERT_RTNL(); |
|
call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev); |
|
call_netdevice_notifiers(NETDEV_RESEND_IGMP, dev); |
|
} |
|
EXPORT_SYMBOL(__netdev_notify_peers); |
|
|
|
/** |
|
* netdev_notify_peers - notify network peers about existence of @dev |
|
* @dev: network device |
|
* |
|
* Generate traffic such that interested network peers are aware of |
|
* @dev, such as by generating a gratuitous ARP. This may be used when |
|
* a device wants to inform the rest of the network about some sort of |
|
* reconfiguration such as a failover event or virtual machine |
|
* migration. |
|
*/ |
|
void netdev_notify_peers(struct net_device *dev) |
|
{ |
|
rtnl_lock(); |
|
__netdev_notify_peers(dev); |
|
rtnl_unlock(); |
|
} |
|
EXPORT_SYMBOL(netdev_notify_peers); |
|
|
|
static int napi_threaded_poll(void *data); |
|
|
|
static int napi_kthread_create(struct napi_struct *n) |
|
{ |
|
int err = 0; |
|
|
|
/* Create and wake up the kthread once to put it in |
|
* TASK_INTERRUPTIBLE mode to avoid the blocked task |
|
* warning and work with loadavg. |
|
*/ |
|
n->thread = kthread_run(napi_threaded_poll, n, "napi/%s-%d", |
|
n->dev->name, n->napi_id); |
|
if (IS_ERR(n->thread)) { |
|
err = PTR_ERR(n->thread); |
|
pr_err("kthread_run failed with err %d\n", err); |
|
n->thread = NULL; |
|
} |
|
|
|
return err; |
|
} |
|
|
|
static int __dev_open(struct net_device *dev, struct netlink_ext_ack *extack) |
|
{ |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
int ret; |
|
|
|
ASSERT_RTNL(); |
|
dev_addr_check(dev); |
|
|
|
if (!netif_device_present(dev)) { |
|
/* may be detached because parent is runtime-suspended */ |
|
if (dev->dev.parent) |
|
pm_runtime_resume(dev->dev.parent); |
|
if (!netif_device_present(dev)) |
|
return -ENODEV; |
|
} |
|
|
|
/* Block netpoll from trying to do any rx path servicing. |
|
* If we don't do this there is a chance ndo_poll_controller |
|
* or ndo_poll may be running while we open the device |
|
*/ |
|
netpoll_poll_disable(dev); |
|
|
|
ret = call_netdevice_notifiers_extack(NETDEV_PRE_UP, dev, extack); |
|
ret = notifier_to_errno(ret); |
|
if (ret) |
|
return ret; |
|
|
|
set_bit(__LINK_STATE_START, &dev->state); |
|
|
|
if (ops->ndo_validate_addr) |
|
ret = ops->ndo_validate_addr(dev); |
|
|
|
if (!ret && ops->ndo_open) |
|
ret = ops->ndo_open(dev); |
|
|
|
netpoll_poll_enable(dev); |
|
|
|
if (ret) |
|
clear_bit(__LINK_STATE_START, &dev->state); |
|
else { |
|
dev->flags |= IFF_UP; |
|
dev_set_rx_mode(dev); |
|
dev_activate(dev); |
|
add_device_randomness(dev->dev_addr, dev->addr_len); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* dev_open - prepare an interface for use. |
|
* @dev: device to open |
|
* @extack: netlink extended ack |
|
* |
|
* Takes a device from down to up state. The device's private open |
|
* function is invoked and then the multicast lists are loaded. Finally |
|
* the device is moved into the up state and a %NETDEV_UP message is |
|
* sent to the netdev notifier chain. |
|
* |
|
* Calling this function on an active interface is a nop. On a failure |
|
* a negative errno code is returned. |
|
*/ |
|
int dev_open(struct net_device *dev, struct netlink_ext_ack *extack) |
|
{ |
|
int ret; |
|
|
|
if (dev->flags & IFF_UP) |
|
return 0; |
|
|
|
ret = __dev_open(dev, extack); |
|
if (ret < 0) |
|
return ret; |
|
|
|
rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
|
call_netdevice_notifiers(NETDEV_UP, dev); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(dev_open); |
|
|
|
static void __dev_close_many(struct list_head *head) |
|
{ |
|
struct net_device *dev; |
|
|
|
ASSERT_RTNL(); |
|
might_sleep(); |
|
|
|
list_for_each_entry(dev, head, close_list) { |
|
/* Temporarily disable netpoll until the interface is down */ |
|
netpoll_poll_disable(dev); |
|
|
|
call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
|
|
|
clear_bit(__LINK_STATE_START, &dev->state); |
|
|
|
/* Synchronize to scheduled poll. We cannot touch poll list, it |
|
* can be even on different cpu. So just clear netif_running(). |
|
* |
|
* dev->stop() will invoke napi_disable() on all of it's |
|
* napi_struct instances on this device. |
|
*/ |
|
smp_mb__after_atomic(); /* Commit netif_running(). */ |
|
} |
|
|
|
dev_deactivate_many(head); |
|
|
|
list_for_each_entry(dev, head, close_list) { |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
|
|
/* |
|
* Call the device specific close. This cannot fail. |
|
* Only if device is UP |
|
* |
|
* We allow it to be called even after a DETACH hot-plug |
|
* event. |
|
*/ |
|
if (ops->ndo_stop) |
|
ops->ndo_stop(dev); |
|
|
|
dev->flags &= ~IFF_UP; |
|
netpoll_poll_enable(dev); |
|
} |
|
} |
|
|
|
static void __dev_close(struct net_device *dev) |
|
{ |
|
LIST_HEAD(single); |
|
|
|
list_add(&dev->close_list, &single); |
|
__dev_close_many(&single); |
|
list_del(&single); |
|
} |
|
|
|
void dev_close_many(struct list_head *head, bool unlink) |
|
{ |
|
struct net_device *dev, *tmp; |
|
|
|
/* Remove the devices that don't need to be closed */ |
|
list_for_each_entry_safe(dev, tmp, head, close_list) |
|
if (!(dev->flags & IFF_UP)) |
|
list_del_init(&dev->close_list); |
|
|
|
__dev_close_many(head); |
|
|
|
list_for_each_entry_safe(dev, tmp, head, close_list) { |
|
rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL); |
|
call_netdevice_notifiers(NETDEV_DOWN, dev); |
|
if (unlink) |
|
list_del_init(&dev->close_list); |
|
} |
|
} |
|
EXPORT_SYMBOL(dev_close_many); |
|
|
|
/** |
|
* dev_close - shutdown an interface. |
|
* @dev: device to shutdown |
|
* |
|
* This function moves an active device into down state. A |
|
* %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device |
|
* is then deactivated and finally a %NETDEV_DOWN is sent to the notifier |
|
* chain. |
|
*/ |
|
void dev_close(struct net_device *dev) |
|
{ |
|
if (dev->flags & IFF_UP) { |
|
LIST_HEAD(single); |
|
|
|
list_add(&dev->close_list, &single); |
|
dev_close_many(&single, true); |
|
list_del(&single); |
|
} |
|
} |
|
EXPORT_SYMBOL(dev_close); |
|
|
|
|
|
/** |
|
* dev_disable_lro - disable Large Receive Offload on a device |
|
* @dev: device |
|
* |
|
* Disable Large Receive Offload (LRO) on a net device. Must be |
|
* called under RTNL. This is needed if received packets may be |
|
* forwarded to another interface. |
|
*/ |
|
void dev_disable_lro(struct net_device *dev) |
|
{ |
|
struct net_device *lower_dev; |
|
struct list_head *iter; |
|
|
|
dev->wanted_features &= ~NETIF_F_LRO; |
|
netdev_update_features(dev); |
|
|
|
if (unlikely(dev->features & NETIF_F_LRO)) |
|
netdev_WARN(dev, "failed to disable LRO!\n"); |
|
|
|
netdev_for_each_lower_dev(dev, lower_dev, iter) |
|
dev_disable_lro(lower_dev); |
|
} |
|
EXPORT_SYMBOL(dev_disable_lro); |
|
|
|
/** |
|
* dev_disable_gro_hw - disable HW Generic Receive Offload on a device |
|
* @dev: device |
|
* |
|
* Disable HW Generic Receive Offload (GRO_HW) on a net device. Must be |
|
* called under RTNL. This is needed if Generic XDP is installed on |
|
* the device. |
|
*/ |
|
static void dev_disable_gro_hw(struct net_device *dev) |
|
{ |
|
dev->wanted_features &= ~NETIF_F_GRO_HW; |
|
netdev_update_features(dev); |
|
|
|
if (unlikely(dev->features & NETIF_F_GRO_HW)) |
|
netdev_WARN(dev, "failed to disable GRO_HW!\n"); |
|
} |
|
|
|
const char *netdev_cmd_to_name(enum netdev_cmd cmd) |
|
{ |
|
#define N(val) \ |
|
case NETDEV_##val: \ |
|
return "NETDEV_" __stringify(val); |
|
switch (cmd) { |
|
N(UP) N(DOWN) N(REBOOT) N(CHANGE) N(REGISTER) N(UNREGISTER) |
|
N(CHANGEMTU) N(CHANGEADDR) N(GOING_DOWN) N(CHANGENAME) N(FEAT_CHANGE) |
|
N(BONDING_FAILOVER) N(PRE_UP) N(PRE_TYPE_CHANGE) N(POST_TYPE_CHANGE) |
|
N(POST_INIT) N(RELEASE) N(NOTIFY_PEERS) N(JOIN) N(CHANGEUPPER) |
|
N(RESEND_IGMP) N(PRECHANGEMTU) N(CHANGEINFODATA) N(BONDING_INFO) |
|
N(PRECHANGEUPPER) N(CHANGELOWERSTATE) N(UDP_TUNNEL_PUSH_INFO) |
|
N(UDP_TUNNEL_DROP_INFO) N(CHANGE_TX_QUEUE_LEN) |
|
N(CVLAN_FILTER_PUSH_INFO) N(CVLAN_FILTER_DROP_INFO) |
|
N(SVLAN_FILTER_PUSH_INFO) N(SVLAN_FILTER_DROP_INFO) |
|
N(PRE_CHANGEADDR) N(OFFLOAD_XSTATS_ENABLE) N(OFFLOAD_XSTATS_DISABLE) |
|
N(OFFLOAD_XSTATS_REPORT_USED) N(OFFLOAD_XSTATS_REPORT_DELTA) |
|
} |
|
#undef N |
|
return "UNKNOWN_NETDEV_EVENT"; |
|
} |
|
EXPORT_SYMBOL_GPL(netdev_cmd_to_name); |
|
|
|
static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val, |
|
struct net_device *dev) |
|
{ |
|
struct netdev_notifier_info info = { |
|
.dev = dev, |
|
}; |
|
|
|
return nb->notifier_call(nb, val, &info); |
|
} |
|
|
|
static int call_netdevice_register_notifiers(struct notifier_block *nb, |
|
struct net_device *dev) |
|
{ |
|
int err; |
|
|
|
err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev); |
|
err = notifier_to_errno(err); |
|
if (err) |
|
return err; |
|
|
|
if (!(dev->flags & IFF_UP)) |
|
return 0; |
|
|
|
call_netdevice_notifier(nb, NETDEV_UP, dev); |
|
return 0; |
|
} |
|
|
|
static void call_netdevice_unregister_notifiers(struct notifier_block *nb, |
|
struct net_device *dev) |
|
{ |
|
if (dev->flags & IFF_UP) { |
|
call_netdevice_notifier(nb, NETDEV_GOING_DOWN, |
|
dev); |
|
call_netdevice_notifier(nb, NETDEV_DOWN, dev); |
|
} |
|
call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev); |
|
} |
|
|
|
static int call_netdevice_register_net_notifiers(struct notifier_block *nb, |
|
struct net *net) |
|
{ |
|
struct net_device *dev; |
|
int err; |
|
|
|
for_each_netdev(net, dev) { |
|
err = call_netdevice_register_notifiers(nb, dev); |
|
if (err) |
|
goto rollback; |
|
} |
|
return 0; |
|
|
|
rollback: |
|
for_each_netdev_continue_reverse(net, dev) |
|
call_netdevice_unregister_notifiers(nb, dev); |
|
return err; |
|
} |
|
|
|
static void call_netdevice_unregister_net_notifiers(struct notifier_block *nb, |
|
struct net *net) |
|
{ |
|
struct net_device *dev; |
|
|
|
for_each_netdev(net, dev) |
|
call_netdevice_unregister_notifiers(nb, dev); |
|
} |
|
|
|
static int dev_boot_phase = 1; |
|
|
|
/** |
|
* register_netdevice_notifier - register a network notifier block |
|
* @nb: notifier |
|
* |
|
* Register a notifier to be called when network device events occur. |
|
* The notifier passed is linked into the kernel structures and must |
|
* not be reused until it has been unregistered. A negative errno code |
|
* is returned on a failure. |
|
* |
|
* When registered all registration and up events are replayed |
|
* to the new notifier to allow device to have a race free |
|
* view of the network device list. |
|
*/ |
|
|
|
int register_netdevice_notifier(struct notifier_block *nb) |
|
{ |
|
struct net *net; |
|
int err; |
|
|
|
/* Close race with setup_net() and cleanup_net() */ |
|
down_write(&pernet_ops_rwsem); |
|
rtnl_lock(); |
|
err = raw_notifier_chain_register(&netdev_chain, nb); |
|
if (err) |
|
goto unlock; |
|
if (dev_boot_phase) |
|
goto unlock; |
|
for_each_net(net) { |
|
err = call_netdevice_register_net_notifiers(nb, net); |
|
if (err) |
|
goto rollback; |
|
} |
|
|
|
unlock: |
|
rtnl_unlock(); |
|
up_write(&pernet_ops_rwsem); |
|
return err; |
|
|
|
rollback: |
|
for_each_net_continue_reverse(net) |
|
call_netdevice_unregister_net_notifiers(nb, net); |
|
|
|
raw_notifier_chain_unregister(&netdev_chain, nb); |
|
goto unlock; |
|
} |
|
EXPORT_SYMBOL(register_netdevice_notifier); |
|
|
|
/** |
|
* unregister_netdevice_notifier - unregister a network notifier block |
|
* @nb: notifier |
|
* |
|
* Unregister a notifier previously registered by |
|
* register_netdevice_notifier(). The notifier is unlinked into the |
|
* kernel structures and may then be reused. A negative errno code |
|
* is returned on a failure. |
|
* |
|
* After unregistering unregister and down device events are synthesized |
|
* for all devices on the device list to the removed notifier to remove |
|
* the need for special case cleanup code. |
|
*/ |
|
|
|
int unregister_netdevice_notifier(struct notifier_block *nb) |
|
{ |
|
struct net *net; |
|
int err; |
|
|
|
/* Close race with setup_net() and cleanup_net() */ |
|
down_write(&pernet_ops_rwsem); |
|
rtnl_lock(); |
|
err = raw_notifier_chain_unregister(&netdev_chain, nb); |
|
if (err) |
|
goto unlock; |
|
|
|
for_each_net(net) |
|
call_netdevice_unregister_net_notifiers(nb, net); |
|
|
|
unlock: |
|
rtnl_unlock(); |
|
up_write(&pernet_ops_rwsem); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(unregister_netdevice_notifier); |
|
|
|
static int __register_netdevice_notifier_net(struct net *net, |
|
struct notifier_block *nb, |
|
bool ignore_call_fail) |
|
{ |
|
int err; |
|
|
|
err = raw_notifier_chain_register(&net->netdev_chain, nb); |
|
if (err) |
|
return err; |
|
if (dev_boot_phase) |
|
return 0; |
|
|
|
err = call_netdevice_register_net_notifiers(nb, net); |
|
if (err && !ignore_call_fail) |
|
goto chain_unregister; |
|
|
|
return 0; |
|
|
|
chain_unregister: |
|
raw_notifier_chain_unregister(&net->netdev_chain, nb); |
|
return err; |
|
} |
|
|
|
static int __unregister_netdevice_notifier_net(struct net *net, |
|
struct notifier_block *nb) |
|
{ |
|
int err; |
|
|
|
err = raw_notifier_chain_unregister(&net->netdev_chain, nb); |
|
if (err) |
|
return err; |
|
|
|
call_netdevice_unregister_net_notifiers(nb, net); |
|
return 0; |
|
} |
|
|
|
/** |
|
* register_netdevice_notifier_net - register a per-netns network notifier block |
|
* @net: network namespace |
|
* @nb: notifier |
|
* |
|
* Register a notifier to be called when network device events occur. |
|
* The notifier passed is linked into the kernel structures and must |
|
* not be reused until it has been unregistered. A negative errno code |
|
* is returned on a failure. |
|
* |
|
* When registered all registration and up events are replayed |
|
* to the new notifier to allow device to have a race free |
|
* view of the network device list. |
|
*/ |
|
|
|
int register_netdevice_notifier_net(struct net *net, struct notifier_block *nb) |
|
{ |
|
int err; |
|
|
|
rtnl_lock(); |
|
err = __register_netdevice_notifier_net(net, nb, false); |
|
rtnl_unlock(); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(register_netdevice_notifier_net); |
|
|
|
/** |
|
* unregister_netdevice_notifier_net - unregister a per-netns |
|
* network notifier block |
|
* @net: network namespace |
|
* @nb: notifier |
|
* |
|
* Unregister a notifier previously registered by |
|
* register_netdevice_notifier(). The notifier is unlinked into the |
|
* kernel structures and may then be reused. A negative errno code |
|
* is returned on a failure. |
|
* |
|
* After unregistering unregister and down device events are synthesized |
|
* for all devices on the device list to the removed notifier to remove |
|
* the need for special case cleanup code. |
|
*/ |
|
|
|
int unregister_netdevice_notifier_net(struct net *net, |
|
struct notifier_block *nb) |
|
{ |
|
int err; |
|
|
|
rtnl_lock(); |
|
err = __unregister_netdevice_notifier_net(net, nb); |
|
rtnl_unlock(); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(unregister_netdevice_notifier_net); |
|
|
|
int register_netdevice_notifier_dev_net(struct net_device *dev, |
|
struct notifier_block *nb, |
|
struct netdev_net_notifier *nn) |
|
{ |
|
int err; |
|
|
|
rtnl_lock(); |
|
err = __register_netdevice_notifier_net(dev_net(dev), nb, false); |
|
if (!err) { |
|
nn->nb = nb; |
|
list_add(&nn->list, &dev->net_notifier_list); |
|
} |
|
rtnl_unlock(); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(register_netdevice_notifier_dev_net); |
|
|
|
int unregister_netdevice_notifier_dev_net(struct net_device *dev, |
|
struct notifier_block *nb, |
|
struct netdev_net_notifier *nn) |
|
{ |
|
int err; |
|
|
|
rtnl_lock(); |
|
list_del(&nn->list); |
|
err = __unregister_netdevice_notifier_net(dev_net(dev), nb); |
|
rtnl_unlock(); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(unregister_netdevice_notifier_dev_net); |
|
|
|
static void move_netdevice_notifiers_dev_net(struct net_device *dev, |
|
struct net *net) |
|
{ |
|
struct netdev_net_notifier *nn; |
|
|
|
list_for_each_entry(nn, &dev->net_notifier_list, list) { |
|
__unregister_netdevice_notifier_net(dev_net(dev), nn->nb); |
|
__register_netdevice_notifier_net(net, nn->nb, true); |
|
} |
|
} |
|
|
|
/** |
|
* call_netdevice_notifiers_info - call all network notifier blocks |
|
* @val: value passed unmodified to notifier function |
|
* @info: notifier information data |
|
* |
|
* Call all network notifier blocks. Parameters and return value |
|
* are as for raw_notifier_call_chain(). |
|
*/ |
|
|
|
static int call_netdevice_notifiers_info(unsigned long val, |
|
struct netdev_notifier_info *info) |
|
{ |
|
struct net *net = dev_net(info->dev); |
|
int ret; |
|
|
|
ASSERT_RTNL(); |
|
|
|
/* Run per-netns notifier block chain first, then run the global one. |
|
* Hopefully, one day, the global one is going to be removed after |
|
* all notifier block registrators get converted to be per-netns. |
|
*/ |
|
ret = raw_notifier_call_chain(&net->netdev_chain, val, info); |
|
if (ret & NOTIFY_STOP_MASK) |
|
return ret; |
|
return raw_notifier_call_chain(&netdev_chain, val, info); |
|
} |
|
|
|
/** |
|
* call_netdevice_notifiers_info_robust - call per-netns notifier blocks |
|
* for and rollback on error |
|
* @val_up: value passed unmodified to notifier function |
|
* @val_down: value passed unmodified to the notifier function when |
|
* recovering from an error on @val_up |
|
* @info: notifier information data |
|
* |
|
* Call all per-netns network notifier blocks, but not notifier blocks on |
|
* the global notifier chain. Parameters and return value are as for |
|
* raw_notifier_call_chain_robust(). |
|
*/ |
|
|
|
static int |
|
call_netdevice_notifiers_info_robust(unsigned long val_up, |
|
unsigned long val_down, |
|
struct netdev_notifier_info *info) |
|
{ |
|
struct net *net = dev_net(info->dev); |
|
|
|
ASSERT_RTNL(); |
|
|
|
return raw_notifier_call_chain_robust(&net->netdev_chain, |
|
val_up, val_down, info); |
|
} |
|
|
|
static int call_netdevice_notifiers_extack(unsigned long val, |
|
struct net_device *dev, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct netdev_notifier_info info = { |
|
.dev = dev, |
|
.extack = extack, |
|
}; |
|
|
|
return call_netdevice_notifiers_info(val, &info); |
|
} |
|
|
|
/** |
|
* call_netdevice_notifiers - call all network notifier blocks |
|
* @val: value passed unmodified to notifier function |
|
* @dev: net_device pointer passed unmodified to notifier function |
|
* |
|
* Call all network notifier blocks. Parameters and return value |
|
* are as for raw_notifier_call_chain(). |
|
*/ |
|
|
|
int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
|
{ |
|
return call_netdevice_notifiers_extack(val, dev, NULL); |
|
} |
|
EXPORT_SYMBOL(call_netdevice_notifiers); |
|
|
|
/** |
|
* call_netdevice_notifiers_mtu - call all network notifier blocks |
|
* @val: value passed unmodified to notifier function |
|
* @dev: net_device pointer passed unmodified to notifier function |
|
* @arg: additional u32 argument passed to the notifier function |
|
* |
|
* Call all network notifier blocks. Parameters and return value |
|
* are as for raw_notifier_call_chain(). |
|
*/ |
|
static int call_netdevice_notifiers_mtu(unsigned long val, |
|
struct net_device *dev, u32 arg) |
|
{ |
|
struct netdev_notifier_info_ext info = { |
|
.info.dev = dev, |
|
.ext.mtu = arg, |
|
}; |
|
|
|
BUILD_BUG_ON(offsetof(struct netdev_notifier_info_ext, info) != 0); |
|
|
|
return call_netdevice_notifiers_info(val, &info.info); |
|
} |
|
|
|
#ifdef CONFIG_NET_INGRESS |
|
static DEFINE_STATIC_KEY_FALSE(ingress_needed_key); |
|
|
|
void net_inc_ingress_queue(void) |
|
{ |
|
static_branch_inc(&ingress_needed_key); |
|
} |
|
EXPORT_SYMBOL_GPL(net_inc_ingress_queue); |
|
|
|
void net_dec_ingress_queue(void) |
|
{ |
|
static_branch_dec(&ingress_needed_key); |
|
} |
|
EXPORT_SYMBOL_GPL(net_dec_ingress_queue); |
|
#endif |
|
|
|
#ifdef CONFIG_NET_EGRESS |
|
static DEFINE_STATIC_KEY_FALSE(egress_needed_key); |
|
|
|
void net_inc_egress_queue(void) |
|
{ |
|
static_branch_inc(&egress_needed_key); |
|
} |
|
EXPORT_SYMBOL_GPL(net_inc_egress_queue); |
|
|
|
void net_dec_egress_queue(void) |
|
{ |
|
static_branch_dec(&egress_needed_key); |
|
} |
|
EXPORT_SYMBOL_GPL(net_dec_egress_queue); |
|
#endif |
|
|
|
DEFINE_STATIC_KEY_FALSE(netstamp_needed_key); |
|
EXPORT_SYMBOL(netstamp_needed_key); |
|
#ifdef CONFIG_JUMP_LABEL |
|
static atomic_t netstamp_needed_deferred; |
|
static atomic_t netstamp_wanted; |
|
static void netstamp_clear(struct work_struct *work) |
|
{ |
|
int deferred = atomic_xchg(&netstamp_needed_deferred, 0); |
|
int wanted; |
|
|
|
wanted = atomic_add_return(deferred, &netstamp_wanted); |
|
if (wanted > 0) |
|
static_branch_enable(&netstamp_needed_key); |
|
else |
|
static_branch_disable(&netstamp_needed_key); |
|
} |
|
static DECLARE_WORK(netstamp_work, netstamp_clear); |
|
#endif |
|
|
|
void net_enable_timestamp(void) |
|
{ |
|
#ifdef CONFIG_JUMP_LABEL |
|
int wanted; |
|
|
|
while (1) { |
|
wanted = atomic_read(&netstamp_wanted); |
|
if (wanted <= 0) |
|
break; |
|
if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted + 1) == wanted) |
|
return; |
|
} |
|
atomic_inc(&netstamp_needed_deferred); |
|
schedule_work(&netstamp_work); |
|
#else |
|
static_branch_inc(&netstamp_needed_key); |
|
#endif |
|
} |
|
EXPORT_SYMBOL(net_enable_timestamp); |
|
|
|
void net_disable_timestamp(void) |
|
{ |
|
#ifdef CONFIG_JUMP_LABEL |
|
int wanted; |
|
|
|
while (1) { |
|
wanted = atomic_read(&netstamp_wanted); |
|
if (wanted <= 1) |
|
break; |
|
if (atomic_cmpxchg(&netstamp_wanted, wanted, wanted - 1) == wanted) |
|
return; |
|
} |
|
atomic_dec(&netstamp_needed_deferred); |
|
schedule_work(&netstamp_work); |
|
#else |
|
static_branch_dec(&netstamp_needed_key); |
|
#endif |
|
} |
|
EXPORT_SYMBOL(net_disable_timestamp); |
|
|
|
static inline void net_timestamp_set(struct sk_buff *skb) |
|
{ |
|
skb->tstamp = 0; |
|
skb->mono_delivery_time = 0; |
|
if (static_branch_unlikely(&netstamp_needed_key)) |
|
skb->tstamp = ktime_get_real(); |
|
} |
|
|
|
#define net_timestamp_check(COND, SKB) \ |
|
if (static_branch_unlikely(&netstamp_needed_key)) { \ |
|
if ((COND) && !(SKB)->tstamp) \ |
|
(SKB)->tstamp = ktime_get_real(); \ |
|
} \ |
|
|
|
bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb) |
|
{ |
|
return __is_skb_forwardable(dev, skb, true); |
|
} |
|
EXPORT_SYMBOL_GPL(is_skb_forwardable); |
|
|
|
static int __dev_forward_skb2(struct net_device *dev, struct sk_buff *skb, |
|
bool check_mtu) |
|
{ |
|
int ret = ____dev_forward_skb(dev, skb, check_mtu); |
|
|
|
if (likely(!ret)) { |
|
skb->protocol = eth_type_trans(skb, dev); |
|
skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb) |
|
{ |
|
return __dev_forward_skb2(dev, skb, true); |
|
} |
|
EXPORT_SYMBOL_GPL(__dev_forward_skb); |
|
|
|
/** |
|
* dev_forward_skb - loopback an skb to another netif |
|
* |
|
* @dev: destination network device |
|
* @skb: buffer to forward |
|
* |
|
* return values: |
|
* NET_RX_SUCCESS (no congestion) |
|
* NET_RX_DROP (packet was dropped, but freed) |
|
* |
|
* dev_forward_skb can be used for injecting an skb from the |
|
* start_xmit function of one device into the receive queue |
|
* of another device. |
|
* |
|
* The receiving device may be in another namespace, so |
|
* we have to clear all information in the skb that could |
|
* impact namespace isolation. |
|
*/ |
|
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) |
|
{ |
|
return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb); |
|
} |
|
EXPORT_SYMBOL_GPL(dev_forward_skb); |
|
|
|
int dev_forward_skb_nomtu(struct net_device *dev, struct sk_buff *skb) |
|
{ |
|
return __dev_forward_skb2(dev, skb, false) ?: netif_rx_internal(skb); |
|
} |
|
|
|
static inline int deliver_skb(struct sk_buff *skb, |
|
struct packet_type *pt_prev, |
|
struct net_device *orig_dev) |
|
{ |
|
if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
|
return -ENOMEM; |
|
refcount_inc(&skb->users); |
|
return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
|
} |
|
|
|
static inline void deliver_ptype_list_skb(struct sk_buff *skb, |
|
struct packet_type **pt, |
|
struct net_device *orig_dev, |
|
__be16 type, |
|
struct list_head *ptype_list) |
|
{ |
|
struct packet_type *ptype, *pt_prev = *pt; |
|
|
|
list_for_each_entry_rcu(ptype, ptype_list, list) { |
|
if (ptype->type != type) |
|
continue; |
|
if (pt_prev) |
|
deliver_skb(skb, pt_prev, orig_dev); |
|
pt_prev = ptype; |
|
} |
|
*pt = pt_prev; |
|
} |
|
|
|
static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb) |
|
{ |
|
if (!ptype->af_packet_priv || !skb->sk) |
|
return false; |
|
|
|
if (ptype->id_match) |
|
return ptype->id_match(ptype, skb->sk); |
|
else if ((struct sock *)ptype->af_packet_priv == skb->sk) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
/** |
|
* dev_nit_active - return true if any network interface taps are in use |
|
* |
|
* @dev: network device to check for the presence of taps |
|
*/ |
|
bool dev_nit_active(struct net_device *dev) |
|
{ |
|
return !list_empty(&ptype_all) || !list_empty(&dev->ptype_all); |
|
} |
|
EXPORT_SYMBOL_GPL(dev_nit_active); |
|
|
|
/* |
|
* Support routine. Sends outgoing frames to any network |
|
* taps currently in use. |
|
*/ |
|
|
|
void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
|
{ |
|
struct packet_type *ptype; |
|
struct sk_buff *skb2 = NULL; |
|
struct packet_type *pt_prev = NULL; |
|
struct list_head *ptype_list = &ptype_all; |
|
|
|
rcu_read_lock(); |
|
again: |
|
list_for_each_entry_rcu(ptype, ptype_list, list) { |
|
if (ptype->ignore_outgoing) |
|
continue; |
|
|
|
/* Never send packets back to the socket |
|
* they originated from - MvS ([email protected]) |
|
*/ |
|
if (skb_loop_sk(ptype, skb)) |
|
continue; |
|
|
|
if (pt_prev) { |
|
deliver_skb(skb2, pt_prev, skb->dev); |
|
pt_prev = ptype; |
|
continue; |
|
} |
|
|
|
/* need to clone skb, done only once */ |
|
skb2 = skb_clone(skb, GFP_ATOMIC); |
|
if (!skb2) |
|
goto out_unlock; |
|
|
|
net_timestamp_set(skb2); |
|
|
|
/* skb->nh should be correctly |
|
* set by sender, so that the second statement is |
|
* just protection against buggy protocols. |
|
*/ |
|
skb_reset_mac_header(skb2); |
|
|
|
if (skb_network_header(skb2) < skb2->data || |
|
skb_network_header(skb2) > skb_tail_pointer(skb2)) { |
|
net_crit_ratelimited("protocol %04x is buggy, dev %s\n", |
|
ntohs(skb2->protocol), |
|
dev->name); |
|
skb_reset_network_header(skb2); |
|
} |
|
|
|
skb2->transport_header = skb2->network_header; |
|
skb2->pkt_type = PACKET_OUTGOING; |
|
pt_prev = ptype; |
|
} |
|
|
|
if (ptype_list == &ptype_all) { |
|
ptype_list = &dev->ptype_all; |
|
goto again; |
|
} |
|
out_unlock: |
|
if (pt_prev) { |
|
if (!skb_orphan_frags_rx(skb2, GFP_ATOMIC)) |
|
pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); |
|
else |
|
kfree_skb(skb2); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
EXPORT_SYMBOL_GPL(dev_queue_xmit_nit); |
|
|
|
/** |
|
* netif_setup_tc - Handle tc mappings on real_num_tx_queues change |
|
* @dev: Network device |
|
* @txq: number of queues available |
|
* |
|
* If real_num_tx_queues is changed the tc mappings may no longer be |
|
* valid. To resolve this verify the tc mapping remains valid and if |
|
* not NULL the mapping. With no priorities mapping to this |
|
* offset/count pair it will no longer be used. In the worst case TC0 |
|
* is invalid nothing can be done so disable priority mappings. If is |
|
* expected that drivers will fix this mapping if they can before |
|
* calling netif_set_real_num_tx_queues. |
|
*/ |
|
static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
|
{ |
|
int i; |
|
struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; |
|
|
|
/* If TC0 is invalidated disable TC mapping */ |
|
if (tc->offset + tc->count > txq) { |
|
netdev_warn(dev, "Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n"); |
|
dev->num_tc = 0; |
|
return; |
|
} |
|
|
|
/* Invalidated prio to tc mappings set to TC0 */ |
|
for (i = 1; i < TC_BITMASK + 1; i++) { |
|
int q = netdev_get_prio_tc_map(dev, i); |
|
|
|
tc = &dev->tc_to_txq[q]; |
|
if (tc->offset + tc->count > txq) { |
|
netdev_warn(dev, "Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n", |
|
i, q); |
|
netdev_set_prio_tc_map(dev, i, 0); |
|
} |
|
} |
|
} |
|
|
|
int netdev_txq_to_tc(struct net_device *dev, unsigned int txq) |
|
{ |
|
if (dev->num_tc) { |
|
struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; |
|
int i; |
|
|
|
/* walk through the TCs and see if it falls into any of them */ |
|
for (i = 0; i < TC_MAX_QUEUE; i++, tc++) { |
|
if ((txq - tc->offset) < tc->count) |
|
return i; |
|
} |
|
|
|
/* didn't find it, just return -1 to indicate no match */ |
|
return -1; |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(netdev_txq_to_tc); |
|
|
|
#ifdef CONFIG_XPS |
|
static struct static_key xps_needed __read_mostly; |
|
static struct static_key xps_rxqs_needed __read_mostly; |
|
static DEFINE_MUTEX(xps_map_mutex); |
|
#define xmap_dereference(P) \ |
|
rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) |
|
|
|
static bool remove_xps_queue(struct xps_dev_maps *dev_maps, |
|
struct xps_dev_maps *old_maps, int tci, u16 index) |
|
{ |
|
struct xps_map *map = NULL; |
|
int pos; |
|
|
|
if (dev_maps) |
|
map = xmap_dereference(dev_maps->attr_map[tci]); |
|
if (!map) |
|
return false; |
|
|
|
for (pos = map->len; pos--;) { |
|
if (map->queues[pos] != index) |
|
continue; |
|
|
|
if (map->len > 1) { |
|
map->queues[pos] = map->queues[--map->len]; |
|
break; |
|
} |
|
|
|
if (old_maps) |
|
RCU_INIT_POINTER(old_maps->attr_map[tci], NULL); |
|
RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL); |
|
kfree_rcu(map, rcu); |
|
return false; |
|
} |
|
|
|
return true; |
|
} |
|
|
|
static bool remove_xps_queue_cpu(struct net_device *dev, |
|
struct xps_dev_maps *dev_maps, |
|
int cpu, u16 offset, u16 count) |
|
{ |
|
int num_tc = dev_maps->num_tc; |
|
bool active = false; |
|
int tci; |
|
|
|
for (tci = cpu * num_tc; num_tc--; tci++) { |
|
int i, j; |
|
|
|
for (i = count, j = offset; i--; j++) { |
|
if (!remove_xps_queue(dev_maps, NULL, tci, j)) |
|
break; |
|
} |
|
|
|
active |= i < 0; |
|
} |
|
|
|
return active; |
|
} |
|
|
|
static void reset_xps_maps(struct net_device *dev, |
|
struct xps_dev_maps *dev_maps, |
|
enum xps_map_type type) |
|
{ |
|
static_key_slow_dec_cpuslocked(&xps_needed); |
|
if (type == XPS_RXQS) |
|
static_key_slow_dec_cpuslocked(&xps_rxqs_needed); |
|
|
|
RCU_INIT_POINTER(dev->xps_maps[type], NULL); |
|
|
|
kfree_rcu(dev_maps, rcu); |
|
} |
|
|
|
static void clean_xps_maps(struct net_device *dev, enum xps_map_type type, |
|
u16 offset, u16 count) |
|
{ |
|
struct xps_dev_maps *dev_maps; |
|
bool active = false; |
|
int i, j; |
|
|
|
dev_maps = xmap_dereference(dev->xps_maps[type]); |
|
if (!dev_maps) |
|
return; |
|
|
|
for (j = 0; j < dev_maps->nr_ids; j++) |
|
active |= remove_xps_queue_cpu(dev, dev_maps, j, offset, count); |
|
if (!active) |
|
reset_xps_maps(dev, dev_maps, type); |
|
|
|
if (type == XPS_CPUS) { |
|
for (i = offset + (count - 1); count--; i--) |
|
netdev_queue_numa_node_write( |
|
netdev_get_tx_queue(dev, i), NUMA_NO_NODE); |
|
} |
|
} |
|
|
|
static void netif_reset_xps_queues(struct net_device *dev, u16 offset, |
|
u16 count) |
|
{ |
|
if (!static_key_false(&xps_needed)) |
|
return; |
|
|
|
cpus_read_lock(); |
|
mutex_lock(&xps_map_mutex); |
|
|
|
if (static_key_false(&xps_rxqs_needed)) |
|
clean_xps_maps(dev, XPS_RXQS, offset, count); |
|
|
|
clean_xps_maps(dev, XPS_CPUS, offset, count); |
|
|
|
mutex_unlock(&xps_map_mutex); |
|
cpus_read_unlock(); |
|
} |
|
|
|
static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index) |
|
{ |
|
netif_reset_xps_queues(dev, index, dev->num_tx_queues - index); |
|
} |
|
|
|
static struct xps_map *expand_xps_map(struct xps_map *map, int attr_index, |
|
u16 index, bool is_rxqs_map) |
|
{ |
|
struct xps_map *new_map; |
|
int alloc_len = XPS_MIN_MAP_ALLOC; |
|
int i, pos; |
|
|
|
for (pos = 0; map && pos < map->len; pos++) { |
|
if (map->queues[pos] != index) |
|
continue; |
|
return map; |
|
} |
|
|
|
/* Need to add tx-queue to this CPU's/rx-queue's existing map */ |
|
if (map) { |
|
if (pos < map->alloc_len) |
|
return map; |
|
|
|
alloc_len = map->alloc_len * 2; |
|
} |
|
|
|
/* Need to allocate new map to store tx-queue on this CPU's/rx-queue's |
|
* map |
|
*/ |
|
if (is_rxqs_map) |
|
new_map = kzalloc(XPS_MAP_SIZE(alloc_len), GFP_KERNEL); |
|
else |
|
new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL, |
|
cpu_to_node(attr_index)); |
|
if (!new_map) |
|
return NULL; |
|
|
|
for (i = 0; i < pos; i++) |
|
new_map->queues[i] = map->queues[i]; |
|
new_map->alloc_len = alloc_len; |
|
new_map->len = pos; |
|
|
|
return new_map; |
|
} |
|
|
|
/* Copy xps maps at a given index */ |
|
static void xps_copy_dev_maps(struct xps_dev_maps *dev_maps, |
|
struct xps_dev_maps *new_dev_maps, int index, |
|
int tc, bool skip_tc) |
|
{ |
|
int i, tci = index * dev_maps->num_tc; |
|
struct xps_map *map; |
|
|
|
/* copy maps belonging to foreign traffic classes */ |
|
for (i = 0; i < dev_maps->num_tc; i++, tci++) { |
|
if (i == tc && skip_tc) |
|
continue; |
|
|
|
/* fill in the new device map from the old device map */ |
|
map = xmap_dereference(dev_maps->attr_map[tci]); |
|
RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); |
|
} |
|
} |
|
|
|
/* Must be called under cpus_read_lock */ |
|
int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask, |
|
u16 index, enum xps_map_type type) |
|
{ |
|
struct xps_dev_maps *dev_maps, *new_dev_maps = NULL, *old_dev_maps = NULL; |
|
const unsigned long *online_mask = NULL; |
|
bool active = false, copy = false; |
|
int i, j, tci, numa_node_id = -2; |
|
int maps_sz, num_tc = 1, tc = 0; |
|
struct xps_map *map, *new_map; |
|
unsigned int nr_ids; |
|
|
|
if (dev->num_tc) { |
|
/* Do not allow XPS on subordinate device directly */ |
|
num_tc = dev->num_tc; |
|
if (num_tc < 0) |
|
return -EINVAL; |
|
|
|
/* If queue belongs to subordinate dev use its map */ |
|
dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev; |
|
|
|
tc = netdev_txq_to_tc(dev, index); |
|
if (tc < 0) |
|
return -EINVAL; |
|
} |
|
|
|
mutex_lock(&xps_map_mutex); |
|
|
|
dev_maps = xmap_dereference(dev->xps_maps[type]); |
|
if (type == XPS_RXQS) { |
|
maps_sz = XPS_RXQ_DEV_MAPS_SIZE(num_tc, dev->num_rx_queues); |
|
nr_ids = dev->num_rx_queues; |
|
} else { |
|
maps_sz = XPS_CPU_DEV_MAPS_SIZE(num_tc); |
|
if (num_possible_cpus() > 1) |
|
online_mask = cpumask_bits(cpu_online_mask); |
|
nr_ids = nr_cpu_ids; |
|
} |
|
|
|
if (maps_sz < L1_CACHE_BYTES) |
|
maps_sz = L1_CACHE_BYTES; |
|
|
|
/* The old dev_maps could be larger or smaller than the one we're |
|
* setting up now, as dev->num_tc or nr_ids could have been updated in |
|
* between. We could try to be smart, but let's be safe instead and only |
|
* copy foreign traffic classes if the two map sizes match. |
|
*/ |
|
if (dev_maps && |
|
dev_maps->num_tc == num_tc && dev_maps->nr_ids == nr_ids) |
|
copy = true; |
|
|
|
/* allocate memory for queue storage */ |
|
for (j = -1; j = netif_attrmask_next_and(j, online_mask, mask, nr_ids), |
|
j < nr_ids;) { |
|
if (!new_dev_maps) { |
|
new_dev_maps = kzalloc(maps_sz, GFP_KERNEL); |
|
if (!new_dev_maps) { |
|
mutex_unlock(&xps_map_mutex); |
|
return -ENOMEM; |
|
} |
|
|
|
new_dev_maps->nr_ids = nr_ids; |
|
new_dev_maps->num_tc = num_tc; |
|
} |
|
|
|
tci = j * num_tc + tc; |
|
map = copy ? xmap_dereference(dev_maps->attr_map[tci]) : NULL; |
|
|
|
map = expand_xps_map(map, j, index, type == XPS_RXQS); |
|
if (!map) |
|
goto error; |
|
|
|
RCU_INIT_POINTER(new_dev_maps->attr_map[tci], map); |
|
} |
|
|
|
if (!new_dev_maps) |
|
goto out_no_new_maps; |
|
|
|
if (!dev_maps) { |
|
/* Increment static keys at most once per type */ |
|
static_key_slow_inc_cpuslocked(&xps_needed); |
|
if (type == XPS_RXQS) |
|
static_key_slow_inc_cpuslocked(&xps_rxqs_needed); |
|
} |
|
|
|
for (j = 0; j < nr_ids; j++) { |
|
bool skip_tc = false; |
|
|
|
tci = j * num_tc + tc; |
|
if (netif_attr_test_mask(j, mask, nr_ids) && |
|
netif_attr_test_online(j, online_mask, nr_ids)) { |
|
/* add tx-queue to CPU/rx-queue maps */ |
|
int pos = 0; |
|
|
|
skip_tc = true; |
|
|
|
map = xmap_dereference(new_dev_maps->attr_map[tci]); |
|
while ((pos < map->len) && (map->queues[pos] != index)) |
|
pos++; |
|
|
|
if (pos == map->len) |
|
map->queues[map->len++] = index; |
|
#ifdef CONFIG_NUMA |
|
if (type == XPS_CPUS) { |
|
if (numa_node_id == -2) |
|
numa_node_id = cpu_to_node(j); |
|
else if (numa_node_id != cpu_to_node(j)) |
|
numa_node_id = -1; |
|
} |
|
#endif |
|
} |
|
|
|
if (copy) |
|
xps_copy_dev_maps(dev_maps, new_dev_maps, j, tc, |
|
skip_tc); |
|
} |
|
|
|
rcu_assign_pointer(dev->xps_maps[type], new_dev_maps); |
|
|
|
/* Cleanup old maps */ |
|
if (!dev_maps) |
|
goto out_no_old_maps; |
|
|
|
for (j = 0; j < dev_maps->nr_ids; j++) { |
|
for (i = num_tc, tci = j * dev_maps->num_tc; i--; tci++) { |
|
map = xmap_dereference(dev_maps->attr_map[tci]); |
|
if (!map) |
|
continue; |
|
|
|
if (copy) { |
|
new_map = xmap_dereference(new_dev_maps->attr_map[tci]); |
|
if (map == new_map) |
|
continue; |
|
} |
|
|
|
RCU_INIT_POINTER(dev_maps->attr_map[tci], NULL); |
|
kfree_rcu(map, rcu); |
|
} |
|
} |
|
|
|
old_dev_maps = dev_maps; |
|
|
|
out_no_old_maps: |
|
dev_maps = new_dev_maps; |
|
active = true; |
|
|
|
out_no_new_maps: |
|
if (type == XPS_CPUS) |
|
/* update Tx queue numa node */ |
|
netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index), |
|
(numa_node_id >= 0) ? |
|
numa_node_id : NUMA_NO_NODE); |
|
|
|
if (!dev_maps) |
|
goto out_no_maps; |
|
|
|
/* removes tx-queue from unused CPUs/rx-queues */ |
|
for (j = 0; j < dev_maps->nr_ids; j++) { |
|
tci = j * dev_maps->num_tc; |
|
|
|
for (i = 0; i < dev_maps->num_tc; i++, tci++) { |
|
if (i == tc && |
|
netif_attr_test_mask(j, mask, dev_maps->nr_ids) && |
|
netif_attr_test_online(j, online_mask, dev_maps->nr_ids)) |
|
continue; |
|
|
|
active |= remove_xps_queue(dev_maps, |
|
copy ? old_dev_maps : NULL, |
|
tci, index); |
|
} |
|
} |
|
|
|
if (old_dev_maps) |
|
kfree_rcu(old_dev_maps, rcu); |
|
|
|
/* free map if not active */ |
|
if (!active) |
|
reset_xps_maps(dev, dev_maps, type); |
|
|
|
out_no_maps: |
|
mutex_unlock(&xps_map_mutex); |
|
|
|
return 0; |
|
error: |
|
/* remove any maps that we added */ |
|
for (j = 0; j < nr_ids; j++) { |
|
for (i = num_tc, tci = j * num_tc; i--; tci++) { |
|
new_map = xmap_dereference(new_dev_maps->attr_map[tci]); |
|
map = copy ? |
|
xmap_dereference(dev_maps->attr_map[tci]) : |
|
NULL; |
|
if (new_map && new_map != map) |
|
kfree(new_map); |
|
} |
|
} |
|
|
|
mutex_unlock(&xps_map_mutex); |
|
|
|
kfree(new_dev_maps); |
|
return -ENOMEM; |
|
} |
|
EXPORT_SYMBOL_GPL(__netif_set_xps_queue); |
|
|
|
int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask, |
|
u16 index) |
|
{ |
|
int ret; |
|
|
|
cpus_read_lock(); |
|
ret = __netif_set_xps_queue(dev, cpumask_bits(mask), index, XPS_CPUS); |
|
cpus_read_unlock(); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(netif_set_xps_queue); |
|
|
|
#endif |
|
static void netdev_unbind_all_sb_channels(struct net_device *dev) |
|
{ |
|
struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues]; |
|
|
|
/* Unbind any subordinate channels */ |
|
while (txq-- != &dev->_tx[0]) { |
|
if (txq->sb_dev) |
|
netdev_unbind_sb_channel(dev, txq->sb_dev); |
|
} |
|
} |
|
|
|
void netdev_reset_tc(struct net_device *dev) |
|
{ |
|
#ifdef CONFIG_XPS |
|
netif_reset_xps_queues_gt(dev, 0); |
|
#endif |
|
netdev_unbind_all_sb_channels(dev); |
|
|
|
/* Reset TC configuration of device */ |
|
dev->num_tc = 0; |
|
memset(dev->tc_to_txq, 0, sizeof(dev->tc_to_txq)); |
|
memset(dev->prio_tc_map, 0, sizeof(dev->prio_tc_map)); |
|
} |
|
EXPORT_SYMBOL(netdev_reset_tc); |
|
|
|
int netdev_set_tc_queue(struct net_device *dev, u8 tc, u16 count, u16 offset) |
|
{ |
|
if (tc >= dev->num_tc) |
|
return -EINVAL; |
|
|
|
#ifdef CONFIG_XPS |
|
netif_reset_xps_queues(dev, offset, count); |
|
#endif |
|
dev->tc_to_txq[tc].count = count; |
|
dev->tc_to_txq[tc].offset = offset; |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(netdev_set_tc_queue); |
|
|
|
int netdev_set_num_tc(struct net_device *dev, u8 num_tc) |
|
{ |
|
if (num_tc > TC_MAX_QUEUE) |
|
return -EINVAL; |
|
|
|
#ifdef CONFIG_XPS |
|
netif_reset_xps_queues_gt(dev, 0); |
|
#endif |
|
netdev_unbind_all_sb_channels(dev); |
|
|
|
dev->num_tc = num_tc; |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(netdev_set_num_tc); |
|
|
|
void netdev_unbind_sb_channel(struct net_device *dev, |
|
struct net_device *sb_dev) |
|
{ |
|
struct netdev_queue *txq = &dev->_tx[dev->num_tx_queues]; |
|
|
|
#ifdef CONFIG_XPS |
|
netif_reset_xps_queues_gt(sb_dev, 0); |
|
#endif |
|
memset(sb_dev->tc_to_txq, 0, sizeof(sb_dev->tc_to_txq)); |
|
memset(sb_dev->prio_tc_map, 0, sizeof(sb_dev->prio_tc_map)); |
|
|
|
while (txq-- != &dev->_tx[0]) { |
|
if (txq->sb_dev == sb_dev) |
|
txq->sb_dev = NULL; |
|
} |
|
} |
|
EXPORT_SYMBOL(netdev_unbind_sb_channel); |
|
|
|
int netdev_bind_sb_channel_queue(struct net_device *dev, |
|
struct net_device *sb_dev, |
|
u8 tc, u16 count, u16 offset) |
|
{ |
|
/* Make certain the sb_dev and dev are already configured */ |
|
if (sb_dev->num_tc >= 0 || tc >= dev->num_tc) |
|
return -EINVAL; |
|
|
|
/* We cannot hand out queues we don't have */ |
|
if ((offset + count) > dev->real_num_tx_queues) |
|
return -EINVAL; |
|
|
|
/* Record the mapping */ |
|
sb_dev->tc_to_txq[tc].count = count; |
|
sb_dev->tc_to_txq[tc].offset = offset; |
|
|
|
/* Provide a way for Tx queue to find the tc_to_txq map or |
|
* XPS map for itself. |
|
*/ |
|
while (count--) |
|
netdev_get_tx_queue(dev, count + offset)->sb_dev = sb_dev; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(netdev_bind_sb_channel_queue); |
|
|
|
int netdev_set_sb_channel(struct net_device *dev, u16 channel) |
|
{ |
|
/* Do not use a multiqueue device to represent a subordinate channel */ |
|
if (netif_is_multiqueue(dev)) |
|
return -ENODEV; |
|
|
|
/* We allow channels 1 - 32767 to be used for subordinate channels. |
|
* Channel 0 is meant to be "native" mode and used only to represent |
|
* the main root device. We allow writing 0 to reset the device back |
|
* to normal mode after being used as a subordinate channel. |
|
*/ |
|
if (channel > S16_MAX) |
|
return -EINVAL; |
|
|
|
dev->num_tc = -channel; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(netdev_set_sb_channel); |
|
|
|
/* |
|
* Routine to help set real_num_tx_queues. To avoid skbs mapped to queues |
|
* greater than real_num_tx_queues stale skbs on the qdisc must be flushed. |
|
*/ |
|
int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) |
|
{ |
|
bool disabling; |
|
int rc; |
|
|
|
disabling = txq < dev->real_num_tx_queues; |
|
|
|
if (txq < 1 || txq > dev->num_tx_queues) |
|
return -EINVAL; |
|
|
|
if (dev->reg_state == NETREG_REGISTERED || |
|
dev->reg_state == NETREG_UNREGISTERING) { |
|
ASSERT_RTNL(); |
|
|
|
rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
|
txq); |
|
if (rc) |
|
return rc; |
|
|
|
if (dev->num_tc) |
|
netif_setup_tc(dev, txq); |
|
|
|
dev_qdisc_change_real_num_tx(dev, txq); |
|
|
|
dev->real_num_tx_queues = txq; |
|
|
|
if (disabling) { |
|
synchronize_net(); |
|
qdisc_reset_all_tx_gt(dev, txq); |
|
#ifdef CONFIG_XPS |
|
netif_reset_xps_queues_gt(dev, txq); |
|
#endif |
|
} |
|
} else { |
|
dev->real_num_tx_queues = txq; |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(netif_set_real_num_tx_queues); |
|
|
|
#ifdef CONFIG_SYSFS |
|
/** |
|
* netif_set_real_num_rx_queues - set actual number of RX queues used |
|
* @dev: Network device |
|
* @rxq: Actual number of RX queues |
|
* |
|
* This must be called either with the rtnl_lock held or before |
|
* registration of the net device. Returns 0 on success, or a |
|
* negative error code. If called before registration, it always |
|
* succeeds. |
|
*/ |
|
int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) |
|
{ |
|
int rc; |
|
|
|
if (rxq < 1 || rxq > dev->num_rx_queues) |
|
return -EINVAL; |
|
|
|
if (dev->reg_state == NETREG_REGISTERED) { |
|
ASSERT_RTNL(); |
|
|
|
rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
|
rxq); |
|
if (rc) |
|
return rc; |
|
} |
|
|
|
dev->real_num_rx_queues = rxq; |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(netif_set_real_num_rx_queues); |
|
#endif |
|
|
|
/** |
|
* netif_set_real_num_queues - set actual number of RX and TX queues used |
|
* @dev: Network device |
|
* @txq: Actual number of TX queues |
|
* @rxq: Actual number of RX queues |
|
* |
|
* Set the real number of both TX and RX queues. |
|
* Does nothing if the number of queues is already correct. |
|
*/ |
|
int netif_set_real_num_queues(struct net_device *dev, |
|
unsigned int txq, unsigned int rxq) |
|
{ |
|
unsigned int old_rxq = dev->real_num_rx_queues; |
|
int err; |
|
|
|
if (txq < 1 || txq > dev->num_tx_queues || |
|
rxq < 1 || rxq > dev->num_rx_queues) |
|
return -EINVAL; |
|
|
|
/* Start from increases, so the error path only does decreases - |
|
* decreases can't fail. |
|
*/ |
|
if (rxq > dev->real_num_rx_queues) { |
|
err = netif_set_real_num_rx_queues(dev, rxq); |
|
if (err) |
|
return err; |
|
} |
|
if (txq > dev->real_num_tx_queues) { |
|
err = netif_set_real_num_tx_queues(dev, txq); |
|
if (err) |
|
goto undo_rx; |
|
} |
|
if (rxq < dev->real_num_rx_queues) |
|
WARN_ON(netif_set_real_num_rx_queues(dev, rxq)); |
|
if (txq < dev->real_num_tx_queues) |
|
WARN_ON(netif_set_real_num_tx_queues(dev, txq)); |
|
|
|
return 0; |
|
undo_rx: |
|
WARN_ON(netif_set_real_num_rx_queues(dev, old_rxq)); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(netif_set_real_num_queues); |
|
|
|
/** |
|
* netif_set_tso_max_size() - set the max size of TSO frames supported |
|
* @dev: netdev to update |
|
* @size: max skb->len of a TSO frame |
|
* |
|
* Set the limit on the size of TSO super-frames the device can handle. |
|
* Unless explicitly set the stack will assume the value of |
|
* %GSO_LEGACY_MAX_SIZE. |
|
*/ |
|
void netif_set_tso_max_size(struct net_device *dev, unsigned int size) |
|
{ |
|
dev->tso_max_size = min(GSO_MAX_SIZE, size); |
|
if (size < READ_ONCE(dev->gso_max_size)) |
|
netif_set_gso_max_size(dev, size); |
|
} |
|
EXPORT_SYMBOL(netif_set_tso_max_size); |
|
|
|
/** |
|
* netif_set_tso_max_segs() - set the max number of segs supported for TSO |
|
* @dev: netdev to update |
|
* @segs: max number of TCP segments |
|
* |
|
* Set the limit on the number of TCP segments the device can generate from |
|
* a single TSO super-frame. |
|
* Unless explicitly set the stack will assume the value of %GSO_MAX_SEGS. |
|
*/ |
|
void netif_set_tso_max_segs(struct net_device *dev, unsigned int segs) |
|
{ |
|
dev->tso_max_segs = segs; |
|
if (segs < READ_ONCE(dev->gso_max_segs)) |
|
netif_set_gso_max_segs(dev, segs); |
|
} |
|
EXPORT_SYMBOL(netif_set_tso_max_segs); |
|
|
|
/** |
|
* netif_inherit_tso_max() - copy all TSO limits from a lower device to an upper |
|
* @to: netdev to update |
|
* @from: netdev from which to copy the limits |
|
*/ |
|
void netif_inherit_tso_max(struct net_device *to, const struct net_device *from) |
|
{ |
|
netif_set_tso_max_size(to, from->tso_max_size); |
|
netif_set_tso_max_segs(to, from->tso_max_segs); |
|
} |
|
EXPORT_SYMBOL(netif_inherit_tso_max); |
|
|
|
/** |
|
* netif_get_num_default_rss_queues - default number of RSS queues |
|
* |
|
* Default value is the number of physical cores if there are only 1 or 2, or |
|
* divided by 2 if there are more. |
|
*/ |
|
int netif_get_num_default_rss_queues(void) |
|
{ |
|
cpumask_var_t cpus; |
|
int cpu, count = 0; |
|
|
|
if (unlikely(is_kdump_kernel() || !zalloc_cpumask_var(&cpus, GFP_KERNEL))) |
|
return 1; |
|
|
|
cpumask_copy(cpus, cpu_online_mask); |
|
for_each_cpu(cpu, cpus) { |
|
++count; |
|
cpumask_andnot(cpus, cpus, topology_sibling_cpumask(cpu)); |
|
} |
|
free_cpumask_var(cpus); |
|
|
|
return count > 2 ? DIV_ROUND_UP(count, 2) : count; |
|
} |
|
EXPORT_SYMBOL(netif_get_num_default_rss_queues); |
|
|
|
static void __netif_reschedule(struct Qdisc *q) |
|
{ |
|
struct softnet_data *sd; |
|
unsigned long flags; |
|
|
|
local_irq_save(flags); |
|
sd = this_cpu_ptr(&softnet_data); |
|
q->next_sched = NULL; |
|
*sd->output_queue_tailp = q; |
|
sd->output_queue_tailp = &q->next_sched; |
|
raise_softirq_irqoff(NET_TX_SOFTIRQ); |
|
local_irq_restore(flags); |
|
} |
|
|
|
void __netif_schedule(struct Qdisc *q) |
|
{ |
|
if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) |
|
__netif_reschedule(q); |
|
} |
|
EXPORT_SYMBOL(__netif_schedule); |
|
|
|
struct dev_kfree_skb_cb { |
|
enum skb_free_reason reason; |
|
}; |
|
|
|
static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb) |
|
{ |
|
return (struct dev_kfree_skb_cb *)skb->cb; |
|
} |
|
|
|
void netif_schedule_queue(struct netdev_queue *txq) |
|
{ |
|
rcu_read_lock(); |
|
if (!netif_xmit_stopped(txq)) { |
|
struct Qdisc *q = rcu_dereference(txq->qdisc); |
|
|
|
__netif_schedule(q); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
EXPORT_SYMBOL(netif_schedule_queue); |
|
|
|
void netif_tx_wake_queue(struct netdev_queue *dev_queue) |
|
{ |
|
if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) { |
|
struct Qdisc *q; |
|
|
|
rcu_read_lock(); |
|
q = rcu_dereference(dev_queue->qdisc); |
|
__netif_schedule(q); |
|
rcu_read_unlock(); |
|
} |
|
} |
|
EXPORT_SYMBOL(netif_tx_wake_queue); |
|
|
|
void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason) |
|
{ |
|
unsigned long flags; |
|
|
|
if (unlikely(!skb)) |
|
return; |
|
|
|
if (likely(refcount_read(&skb->users) == 1)) { |
|
smp_rmb(); |
|
refcount_set(&skb->users, 0); |
|
} else if (likely(!refcount_dec_and_test(&skb->users))) { |
|
return; |
|
} |
|
get_kfree_skb_cb(skb)->reason = reason; |
|
local_irq_save(flags); |
|
skb->next = __this_cpu_read(softnet_data.completion_queue); |
|
__this_cpu_write(softnet_data.completion_queue, skb); |
|
raise_softirq_irqoff(NET_TX_SOFTIRQ); |
|
local_irq_restore(flags); |
|
} |
|
EXPORT_SYMBOL(__dev_kfree_skb_irq); |
|
|
|
void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason) |
|
{ |
|
if (in_hardirq() || irqs_disabled()) |
|
__dev_kfree_skb_irq(skb, reason); |
|
else |
|
dev_kfree_skb(skb); |
|
} |
|
EXPORT_SYMBOL(__dev_kfree_skb_any); |
|
|
|
|
|
/** |
|
* netif_device_detach - mark device as removed |
|
* @dev: network device |
|
* |
|
* Mark device as removed from system and therefore no longer available. |
|
*/ |
|
void netif_device_detach(struct net_device *dev) |
|
{ |
|
if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && |
|
netif_running(dev)) { |
|
netif_tx_stop_all_queues(dev); |
|
} |
|
} |
|
EXPORT_SYMBOL(netif_device_detach); |
|
|
|
/** |
|
* netif_device_attach - mark device as attached |
|
* @dev: network device |
|
* |
|
* Mark device as attached from system and restart if needed. |
|
*/ |
|
void netif_device_attach(struct net_device *dev) |
|
{ |
|
if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && |
|
netif_running(dev)) { |
|
netif_tx_wake_all_queues(dev); |
|
__netdev_watchdog_up(dev); |
|
} |
|
} |
|
EXPORT_SYMBOL(netif_device_attach); |
|
|
|
/* |
|
* Returns a Tx hash based on the given packet descriptor a Tx queues' number |
|
* to be used as a distribution range. |
|
*/ |
|
static u16 skb_tx_hash(const struct net_device *dev, |
|
const struct net_device *sb_dev, |
|
struct sk_buff *skb) |
|
{ |
|
u32 hash; |
|
u16 qoffset = 0; |
|
u16 qcount = dev->real_num_tx_queues; |
|
|
|
if (dev->num_tc) { |
|
u8 tc = netdev_get_prio_tc_map(dev, skb->priority); |
|
|
|
qoffset = sb_dev->tc_to_txq[tc].offset; |
|
qcount = sb_dev->tc_to_txq[tc].count; |
|
if (unlikely(!qcount)) { |
|
net_warn_ratelimited("%s: invalid qcount, qoffset %u for tc %u\n", |
|
sb_dev->name, qoffset, tc); |
|
qoffset = 0; |
|
qcount = dev->real_num_tx_queues; |
|
} |
|
} |
|
|
|
if (skb_rx_queue_recorded(skb)) { |
|
hash = skb_get_rx_queue(skb); |
|
if (hash >= qoffset) |
|
hash -= qoffset; |
|
while (unlikely(hash >= qcount)) |
|
hash -= qcount; |
|
return hash + qoffset; |
|
} |
|
|
|
return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset; |
|
} |
|
|
|
static void skb_warn_bad_offload(const struct sk_buff *skb) |
|
{ |
|
static const netdev_features_t null_features; |
|
struct net_device *dev = skb->dev; |
|
const char *name = ""; |
|
|
|
if (!net_ratelimit()) |
|
return; |
|
|
|
if (dev) { |
|
if (dev->dev.parent) |
|
name = dev_driver_string(dev->dev.parent); |
|
else |
|
name = netdev_name(dev); |
|
} |
|
skb_dump(KERN_WARNING, skb, false); |
|
WARN(1, "%s: caps=(%pNF, %pNF)\n", |
|
name, dev ? &dev->features : &null_features, |
|
skb->sk ? &skb->sk->sk_route_caps : &null_features); |
|
} |
|
|
|
/* |
|
* Invalidate hardware checksum when packet is to be mangled, and |
|
* complete checksum manually on outgoing path. |
|
*/ |
|
int skb_checksum_help(struct sk_buff *skb) |
|
{ |
|
__wsum csum; |
|
int ret = 0, offset; |
|
|
|
if (skb->ip_summed == CHECKSUM_COMPLETE) |
|
goto out_set_summed; |
|
|
|
if (unlikely(skb_is_gso(skb))) { |
|
skb_warn_bad_offload(skb); |
|
return -EINVAL; |
|
} |
|
|
|
/* Before computing a checksum, we should make sure no frag could |
|
* be modified by an external entity : checksum could be wrong. |
|
*/ |
|
if (skb_has_shared_frag(skb)) { |
|
ret = __skb_linearize(skb); |
|
if (ret) |
|
goto out; |
|
} |
|
|
|
offset = skb_checksum_start_offset(skb); |
|
ret = -EINVAL; |
|
if (WARN_ON_ONCE(offset >= skb_headlen(skb))) { |
|
DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false); |
|
goto out; |
|
} |
|
csum = skb_checksum(skb, offset, skb->len - offset, 0); |
|
|
|
offset += skb->csum_offset; |
|
if (WARN_ON_ONCE(offset + sizeof(__sum16) > skb_headlen(skb))) { |
|
DO_ONCE_LITE(skb_dump, KERN_ERR, skb, false); |
|
goto out; |
|
} |
|
ret = skb_ensure_writable(skb, offset + sizeof(__sum16)); |
|
if (ret) |
|
goto out; |
|
|
|
*(__sum16 *)(skb->data + offset) = csum_fold(csum) ?: CSUM_MANGLED_0; |
|
out_set_summed: |
|
skb->ip_summed = CHECKSUM_NONE; |
|
out: |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(skb_checksum_help); |
|
|
|
int skb_crc32c_csum_help(struct sk_buff *skb) |
|
{ |
|
__le32 crc32c_csum; |
|
int ret = 0, offset, start; |
|
|
|
if (skb->ip_summed != CHECKSUM_PARTIAL) |
|
goto out; |
|
|
|
if (unlikely(skb_is_gso(skb))) |
|
goto out; |
|
|
|
/* Before computing a checksum, we should make sure no frag could |
|
* be modified by an external entity : checksum could be wrong. |
|
*/ |
|
if (unlikely(skb_has_shared_frag(skb))) { |
|
ret = __skb_linearize(skb); |
|
if (ret) |
|
goto out; |
|
} |
|
start = skb_checksum_start_offset(skb); |
|
offset = start + offsetof(struct sctphdr, checksum); |
|
if (WARN_ON_ONCE(offset >= skb_headlen(skb))) { |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
|
|
ret = skb_ensure_writable(skb, offset + sizeof(__le32)); |
|
if (ret) |
|
goto out; |
|
|
|
crc32c_csum = cpu_to_le32(~__skb_checksum(skb, start, |
|
skb->len - start, ~(__u32)0, |
|
crc32c_csum_stub)); |
|
*(__le32 *)(skb->data + offset) = crc32c_csum; |
|
skb->ip_summed = CHECKSUM_NONE; |
|
skb->csum_not_inet = 0; |
|
out: |
|
return ret; |
|
} |
|
|
|
__be16 skb_network_protocol(struct sk_buff *skb, int *depth) |
|
{ |
|
__be16 type = skb->protocol; |
|
|
|
/* Tunnel gso handlers can set protocol to ethernet. */ |
|
if (type == htons(ETH_P_TEB)) { |
|
struct ethhdr *eth; |
|
|
|
if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr)))) |
|
return 0; |
|
|
|
eth = (struct ethhdr *)skb->data; |
|
type = eth->h_proto; |
|
} |
|
|
|
return __vlan_get_protocol(skb, type, depth); |
|
} |
|
|
|
/* openvswitch calls this on rx path, so we need a different check. |
|
*/ |
|
static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) |
|
{ |
|
if (tx_path) |
|
return skb->ip_summed != CHECKSUM_PARTIAL && |
|
skb->ip_summed != CHECKSUM_UNNECESSARY; |
|
|
|
return skb->ip_summed == CHECKSUM_NONE; |
|
} |
|
|
|
/** |
|
* __skb_gso_segment - Perform segmentation on skb. |
|
* @skb: buffer to segment |
|
* @features: features for the output path (see dev->features) |
|
* @tx_path: whether it is called in TX path |
|
* |
|
* This function segments the given skb and returns a list of segments. |
|
* |
|
* It may return NULL if the skb requires no segmentation. This is |
|
* only possible when GSO is used for verifying header integrity. |
|
* |
|
* Segmentation preserves SKB_GSO_CB_OFFSET bytes of previous skb cb. |
|
*/ |
|
struct sk_buff *__skb_gso_segment(struct sk_buff *skb, |
|
netdev_features_t features, bool tx_path) |
|
{ |
|
struct sk_buff *segs; |
|
|
|
if (unlikely(skb_needs_check(skb, tx_path))) { |
|
int err; |
|
|
|
/* We're going to init ->check field in TCP or UDP header */ |
|
err = skb_cow_head(skb, 0); |
|
if (err < 0) |
|
return ERR_PTR(err); |
|
} |
|
|
|
/* Only report GSO partial support if it will enable us to |
|
* support segmentation on this frame without needing additional |
|
* work. |
|
*/ |
|
if (features & NETIF_F_GSO_PARTIAL) { |
|
netdev_features_t partial_features = NETIF_F_GSO_ROBUST; |
|
struct net_device *dev = skb->dev; |
|
|
|
partial_features |= dev->features & dev->gso_partial_features; |
|
if (!skb_gso_ok(skb, features | partial_features)) |
|
features &= ~NETIF_F_GSO_PARTIAL; |
|
} |
|
|
|
BUILD_BUG_ON(SKB_GSO_CB_OFFSET + |
|
sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb)); |
|
|
|
SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb); |
|
SKB_GSO_CB(skb)->encap_level = 0; |
|
|
|
skb_reset_mac_header(skb); |
|
skb_reset_mac_len(skb); |
|
|
|
segs = skb_mac_gso_segment(skb, features); |
|
|
|
if (segs != skb && unlikely(skb_needs_check(skb, tx_path) && !IS_ERR(segs))) |
|
skb_warn_bad_offload(skb); |
|
|
|
return segs; |
|
} |
|
EXPORT_SYMBOL(__skb_gso_segment); |
|
|
|
/* Take action when hardware reception checksum errors are detected. */ |
|
#ifdef CONFIG_BUG |
|
static void do_netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb) |
|
{ |
|
netdev_err(dev, "hw csum failure\n"); |
|
skb_dump(KERN_ERR, skb, true); |
|
dump_stack(); |
|
} |
|
|
|
void netdev_rx_csum_fault(struct net_device *dev, struct sk_buff *skb) |
|
{ |
|
DO_ONCE_LITE(do_netdev_rx_csum_fault, dev, skb); |
|
} |
|
EXPORT_SYMBOL(netdev_rx_csum_fault); |
|
#endif |
|
|
|
/* XXX: check that highmem exists at all on the given machine. */ |
|
static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
|
{ |
|
#ifdef CONFIG_HIGHMEM |
|
int i; |
|
|
|
if (!(dev->features & NETIF_F_HIGHDMA)) { |
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
|
|
|
if (PageHighMem(skb_frag_page(frag))) |
|
return 1; |
|
} |
|
} |
|
#endif |
|
return 0; |
|
} |
|
|
|
/* If MPLS offload request, verify we are testing hardware MPLS features |
|
* instead of standard features for the netdev. |
|
*/ |
|
#if IS_ENABLED(CONFIG_NET_MPLS_GSO) |
|
static netdev_features_t net_mpls_features(struct sk_buff *skb, |
|
netdev_features_t features, |
|
__be16 type) |
|
{ |
|
if (eth_p_mpls(type)) |
|
features &= skb->dev->mpls_features; |
|
|
|
return features; |
|
} |
|
#else |
|
static netdev_features_t net_mpls_features(struct sk_buff *skb, |
|
netdev_features_t features, |
|
__be16 type) |
|
{ |
|
return features; |
|
} |
|
#endif |
|
|
|
static netdev_features_t harmonize_features(struct sk_buff *skb, |
|
netdev_features_t features) |
|
{ |
|
__be16 type; |
|
|
|
type = skb_network_protocol(skb, NULL); |
|
features = net_mpls_features(skb, features, type); |
|
|
|
if (skb->ip_summed != CHECKSUM_NONE && |
|
!can_checksum_protocol(features, type)) { |
|
features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK); |
|
} |
|
if (illegal_highdma(skb->dev, skb)) |
|
features &= ~NETIF_F_SG; |
|
|
|
return features; |
|
} |
|
|
|
netdev_features_t passthru_features_check(struct sk_buff *skb, |
|
struct net_device *dev, |
|
netdev_features_t features) |
|
{ |
|
return features; |
|
} |
|
EXPORT_SYMBOL(passthru_features_check); |
|
|
|
static netdev_features_t dflt_features_check(struct sk_buff *skb, |
|
struct net_device *dev, |
|
netdev_features_t features) |
|
{ |
|
return vlan_features_check(skb, features); |
|
} |
|
|
|
static netdev_features_t gso_features_check(const struct sk_buff *skb, |
|
struct net_device *dev, |
|
netdev_features_t features) |
|
{ |
|
u16 gso_segs = skb_shinfo(skb)->gso_segs; |
|
|
|
if (gso_segs > READ_ONCE(dev->gso_max_segs)) |
|
return features & ~NETIF_F_GSO_MASK; |
|
|
|
if (!skb_shinfo(skb)->gso_type) { |
|
skb_warn_bad_offload(skb); |
|
return features & ~NETIF_F_GSO_MASK; |
|
} |
|
|
|
/* Support for GSO partial features requires software |
|
* intervention before we can actually process the packets |
|
* so we need to strip support for any partial features now |
|
* and we can pull them back in after we have partially |
|
* segmented the frame. |
|
*/ |
|
if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL)) |
|
features &= ~dev->gso_partial_features; |
|
|
|
/* Make sure to clear the IPv4 ID mangling feature if the |
|
* IPv4 header has the potential to be fragmented. |
|
*/ |
|
if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) { |
|
struct iphdr *iph = skb->encapsulation ? |
|
inner_ip_hdr(skb) : ip_hdr(skb); |
|
|
|
if (!(iph->frag_off & htons(IP_DF))) |
|
features &= ~NETIF_F_TSO_MANGLEID; |
|
} |
|
|
|
return features; |
|
} |
|
|
|
netdev_features_t netif_skb_features(struct sk_buff *skb) |
|
{ |
|
struct net_device *dev = skb->dev; |
|
netdev_features_t features = dev->features; |
|
|
|
if (skb_is_gso(skb)) |
|
features = gso_features_check(skb, dev, features); |
|
|
|
/* If encapsulation offload request, verify we are testing |
|
* hardware encapsulation features instead of standard |
|
* features for the netdev |
|
*/ |
|
if (skb->encapsulation) |
|
features &= dev->hw_enc_features; |
|
|
|
if (skb_vlan_tagged(skb)) |
|
features = netdev_intersect_features(features, |
|
dev->vlan_features | |
|
NETIF_F_HW_VLAN_CTAG_TX | |
|
NETIF_F_HW_VLAN_STAG_TX); |
|
|
|
if (dev->netdev_ops->ndo_features_check) |
|
features &= dev->netdev_ops->ndo_features_check(skb, dev, |
|
features); |
|
else |
|
features &= dflt_features_check(skb, dev, features); |
|
|
|
return harmonize_features(skb, features); |
|
} |
|
EXPORT_SYMBOL(netif_skb_features); |
|
|
|
static int xmit_one(struct sk_buff *skb, struct net_device *dev, |
|
struct netdev_queue *txq, bool more) |
|
{ |
|
unsigned int len; |
|
int rc; |
|
|
|
if (dev_nit_active(dev)) |
|
dev_queue_xmit_nit(skb, dev); |
|
|
|
len = skb->len; |
|
trace_net_dev_start_xmit(skb, dev); |
|
rc = netdev_start_xmit(skb, dev, txq, more); |
|
trace_net_dev_xmit(skb, rc, dev, len); |
|
|
|
return rc; |
|
} |
|
|
|
struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev, |
|
struct netdev_queue *txq, int *ret) |
|
{ |
|
struct sk_buff *skb = first; |
|
int rc = NETDEV_TX_OK; |
|
|
|
while (skb) { |
|
struct sk_buff *next = skb->next; |
|
|
|
skb_mark_not_on_list(skb); |
|
rc = xmit_one(skb, dev, txq, next != NULL); |
|
if (unlikely(!dev_xmit_complete(rc))) { |
|
skb->next = next; |
|
goto out; |
|
} |
|
|
|
skb = next; |
|
if (netif_tx_queue_stopped(txq) && skb) { |
|
rc = NETDEV_TX_BUSY; |
|
break; |
|
} |
|
} |
|
|
|
out: |
|
*ret = rc; |
|
return skb; |
|
} |
|
|
|
static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb, |
|
netdev_features_t features) |
|
{ |
|
if (skb_vlan_tag_present(skb) && |
|
!vlan_hw_offload_capable(features, skb->vlan_proto)) |
|
skb = __vlan_hwaccel_push_inside(skb); |
|
return skb; |
|
} |
|
|
|
int skb_csum_hwoffload_help(struct sk_buff *skb, |
|
const netdev_features_t features) |
|
{ |
|
if (unlikely(skb_csum_is_sctp(skb))) |
|
return !!(features & NETIF_F_SCTP_CRC) ? 0 : |
|
skb_crc32c_csum_help(skb); |
|
|
|
if (features & NETIF_F_HW_CSUM) |
|
return 0; |
|
|
|
if (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) { |
|
switch (skb->csum_offset) { |
|
case offsetof(struct tcphdr, check): |
|
case offsetof(struct udphdr, check): |
|
return 0; |
|
} |
|
} |
|
|
|
return skb_checksum_help(skb); |
|
} |
|
EXPORT_SYMBOL(skb_csum_hwoffload_help); |
|
|
|
static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev, bool *again) |
|
{ |
|
netdev_features_t features; |
|
|
|
features = netif_skb_features(skb); |
|
skb = validate_xmit_vlan(skb, features); |
|
if (unlikely(!skb)) |
|
goto out_null; |
|
|
|
skb = sk_validate_xmit_skb(skb, dev); |
|
if (unlikely(!skb)) |
|
goto out_null; |
|
|
|
if (netif_needs_gso(skb, features)) { |
|
struct sk_buff *segs; |
|
|
|
segs = skb_gso_segment(skb, features); |
|
if (IS_ERR(segs)) { |
|
goto out_kfree_skb; |
|
} else if (segs) { |
|
consume_skb(skb); |
|
skb = segs; |
|
} |
|
} else { |
|
if (skb_needs_linearize(skb, features) && |
|
__skb_linearize(skb)) |
|
goto out_kfree_skb; |
|
|
|
/* If packet is not checksummed and device does not |
|
* support checksumming for this protocol, complete |
|
* checksumming here. |
|
*/ |
|
if (skb->ip_summed == CHECKSUM_PARTIAL) { |
|
if (skb->encapsulation) |
|
skb_set_inner_transport_header(skb, |
|
skb_checksum_start_offset(skb)); |
|
else |
|
skb_set_transport_header(skb, |
|
skb_checksum_start_offset(skb)); |
|
if (skb_csum_hwoffload_help(skb, features)) |
|
goto out_kfree_skb; |
|
} |
|
} |
|
|
|
skb = validate_xmit_xfrm(skb, features, again); |
|
|
|
return skb; |
|
|
|
out_kfree_skb: |
|
kfree_skb(skb); |
|
out_null: |
|
dev_core_stats_tx_dropped_inc(dev); |
|
return NULL; |
|
} |
|
|
|
struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev, bool *again) |
|
{ |
|
struct sk_buff *next, *head = NULL, *tail; |
|
|
|
for (; skb != NULL; skb = next) { |
|
next = skb->next; |
|
skb_mark_not_on_list(skb); |
|
|
|
/* in case skb wont be segmented, point to itself */ |
|
skb->prev = skb; |
|
|
|
skb = validate_xmit_skb(skb, dev, again); |
|
if (!skb) |
|
continue; |
|
|
|
if (!head) |
|
head = skb; |
|
else |
|
tail->next = skb; |
|
/* If skb was segmented, skb->prev points to |
|
* the last segment. If not, it still contains skb. |
|
*/ |
|
tail = skb->prev; |
|
} |
|
return head; |
|
} |
|
EXPORT_SYMBOL_GPL(validate_xmit_skb_list); |
|
|
|
static void qdisc_pkt_len_init(struct sk_buff *skb) |
|
{ |
|
const struct skb_shared_info *shinfo = skb_shinfo(skb); |
|
|
|
qdisc_skb_cb(skb)->pkt_len = skb->len; |
|
|
|
/* To get more precise estimation of bytes sent on wire, |
|
* we add to pkt_len the headers size of all segments |
|
*/ |
|
if (shinfo->gso_size && skb_transport_header_was_set(skb)) { |
|
unsigned int hdr_len; |
|
u16 gso_segs = shinfo->gso_segs; |
|
|
|
/* mac layer + network layer */ |
|
hdr_len = skb_transport_header(skb) - skb_mac_header(skb); |
|
|
|
/* + transport layer */ |
|
if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))) { |
|
const struct tcphdr *th; |
|
struct tcphdr _tcphdr; |
|
|
|
th = skb_header_pointer(skb, skb_transport_offset(skb), |
|
sizeof(_tcphdr), &_tcphdr); |
|
if (likely(th)) |
|
hdr_len += __tcp_hdrlen(th); |
|
} else { |
|
struct udphdr _udphdr; |
|
|
|
if (skb_header_pointer(skb, skb_transport_offset(skb), |
|
sizeof(_udphdr), &_udphdr)) |
|
hdr_len += sizeof(struct udphdr); |
|
} |
|
|
|
if (shinfo->gso_type & SKB_GSO_DODGY) |
|
gso_segs = DIV_ROUND_UP(skb->len - hdr_len, |
|
shinfo->gso_size); |
|
|
|
qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len; |
|
} |
|
} |
|
|
|
static int dev_qdisc_enqueue(struct sk_buff *skb, struct Qdisc *q, |
|
struct sk_buff **to_free, |
|
struct netdev_queue *txq) |
|
{ |
|
int rc; |
|
|
|
rc = q->enqueue(skb, q, to_free) & NET_XMIT_MASK; |
|
if (rc == NET_XMIT_SUCCESS) |
|
trace_qdisc_enqueue(q, txq, skb); |
|
return rc; |
|
} |
|
|
|
static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
|
struct net_device *dev, |
|
struct netdev_queue *txq) |
|
{ |
|
spinlock_t *root_lock = qdisc_lock(q); |
|
struct sk_buff *to_free = NULL; |
|
bool contended; |
|
int rc; |
|
|
|
qdisc_calculate_pkt_len(skb, q); |
|
|
|
if (q->flags & TCQ_F_NOLOCK) { |
|
if (q->flags & TCQ_F_CAN_BYPASS && nolock_qdisc_is_empty(q) && |
|
qdisc_run_begin(q)) { |
|
/* Retest nolock_qdisc_is_empty() within the protection |
|
* of q->seqlock to protect from racing with requeuing. |
|
*/ |
|
if (unlikely(!nolock_qdisc_is_empty(q))) { |
|
rc = dev_qdisc_enqueue(skb, q, &to_free, txq); |
|
__qdisc_run(q); |
|
qdisc_run_end(q); |
|
|
|
goto no_lock_out; |
|
} |
|
|
|
qdisc_bstats_cpu_update(q, skb); |
|
if (sch_direct_xmit(skb, q, dev, txq, NULL, true) && |
|
!nolock_qdisc_is_empty(q)) |
|
__qdisc_run(q); |
|
|
|
qdisc_run_end(q); |
|
return NET_XMIT_SUCCESS; |
|
} |
|
|
|
rc = dev_qdisc_enqueue(skb, q, &to_free, txq); |
|
qdisc_run(q); |
|
|
|
no_lock_out: |
|
if (unlikely(to_free)) |
|
kfree_skb_list_reason(to_free, |
|
SKB_DROP_REASON_QDISC_DROP); |
|
return rc; |
|
} |
|
|
|
/* |
|
* Heuristic to force contended enqueues to serialize on a |
|
* separate lock before trying to get qdisc main lock. |
|
* This permits qdisc->running owner to get the lock more |
|
* often and dequeue packets faster. |
|
* On PREEMPT_RT it is possible to preempt the qdisc owner during xmit |
|
* and then other tasks will only enqueue packets. The packets will be |
|
* sent after the qdisc owner is scheduled again. To prevent this |
|
* scenario the task always serialize on the lock. |
|
*/ |
|
contended = qdisc_is_running(q) || IS_ENABLED(CONFIG_PREEMPT_RT); |
|
if (unlikely(contended)) |
|
spin_lock(&q->busylock); |
|
|
|
spin_lock(root_lock); |
|
if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { |
|
__qdisc_drop(skb, &to_free); |
|
rc = NET_XMIT_DROP; |
|
} else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && |
|
qdisc_run_begin(q)) { |
|
/* |
|
* This is a work-conserving queue; there are no old skbs |
|
* waiting to be sent out; and the qdisc is not running - |
|
* xmit the skb directly. |
|
*/ |
|
|
|
qdisc_bstats_update(q, skb); |
|
|
|
if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) { |
|
if (unlikely(contended)) { |
|
spin_unlock(&q->busylock); |
|
contended = false; |
|
} |
|
__qdisc_run(q); |
|
} |
|
|
|
qdisc_run_end(q); |
|
rc = NET_XMIT_SUCCESS; |
|
} else { |
|
rc = dev_qdisc_enqueue(skb, q, &to_free, txq); |
|
if (qdisc_run_begin(q)) { |
|
if (unlikely(contended)) { |
|
spin_unlock(&q->busylock); |
|
contended = false; |
|
} |
|
__qdisc_run(q); |
|
qdisc_run_end(q); |
|
} |
|
} |
|
spin_unlock(root_lock); |
|
if (unlikely(to_free)) |
|
kfree_skb_list_reason(to_free, SKB_DROP_REASON_QDISC_DROP); |
|
if (unlikely(contended)) |
|
spin_unlock(&q->busylock); |
|
return rc; |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
|
static void skb_update_prio(struct sk_buff *skb) |
|
{ |
|
const struct netprio_map *map; |
|
const struct sock *sk; |
|
unsigned int prioidx; |
|
|
|
if (skb->priority) |
|
return; |
|
map = rcu_dereference_bh(skb->dev->priomap); |
|
if (!map) |
|
return; |
|
sk = skb_to_full_sk(skb); |
|
if (!sk) |
|
return; |
|
|
|
prioidx = sock_cgroup_prioidx(&sk->sk_cgrp_data); |
|
|
|
if (prioidx < map->priomap_len) |
|
skb->priority = map->priomap[prioidx]; |
|
} |
|
#else |
|
#define skb_update_prio(skb) |
|
#endif |
|
|
|
/** |
|
* dev_loopback_xmit - loop back @skb |
|
* @net: network namespace this loopback is happening in |
|
* @sk: sk needed to be a netfilter okfn |
|
* @skb: buffer to transmit |
|
*/ |
|
int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb) |
|
{ |
|
skb_reset_mac_header(skb); |
|
__skb_pull(skb, skb_network_offset(skb)); |
|
skb->pkt_type = PACKET_LOOPBACK; |
|
if (skb->ip_summed == CHECKSUM_NONE) |
|
skb->ip_summed = CHECKSUM_UNNECESSARY; |
|
DEBUG_NET_WARN_ON_ONCE(!skb_dst(skb)); |
|
skb_dst_force(skb); |
|
netif_rx(skb); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(dev_loopback_xmit); |
|
|
|
#ifdef CONFIG_NET_EGRESS |
|
static struct sk_buff * |
|
sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev) |
|
{ |
|
#ifdef CONFIG_NET_CLS_ACT |
|
struct mini_Qdisc *miniq = rcu_dereference_bh(dev->miniq_egress); |
|
struct tcf_result cl_res; |
|
|
|
if (!miniq) |
|
return skb; |
|
|
|
/* qdisc_skb_cb(skb)->pkt_len was already set by the caller. */ |
|
tc_skb_cb(skb)->mru = 0; |
|
tc_skb_cb(skb)->post_ct = false; |
|
mini_qdisc_bstats_cpu_update(miniq, skb); |
|
|
|
switch (tcf_classify(skb, miniq->block, miniq->filter_list, &cl_res, false)) { |
|
case TC_ACT_OK: |
|
case TC_ACT_RECLASSIFY: |
|
skb->tc_index = TC_H_MIN(cl_res.classid); |
|
break; |
|
case TC_ACT_SHOT: |
|
mini_qdisc_qstats_cpu_drop(miniq); |
|
*ret = NET_XMIT_DROP; |
|
kfree_skb_reason(skb, SKB_DROP_REASON_TC_EGRESS); |
|
return NULL; |
|
case TC_ACT_STOLEN: |
|
case TC_ACT_QUEUED: |
|
case TC_ACT_TRAP: |
|
*ret = NET_XMIT_SUCCESS; |
|
consume_skb(skb); |
|
return NULL; |
|
case TC_ACT_REDIRECT: |
|
/* No need to push/pop skb's mac_header here on egress! */ |
|
skb_do_redirect(skb); |
|
*ret = NET_XMIT_SUCCESS; |
|
return NULL; |
|
default: |
|
break; |
|
} |
|
#endif /* CONFIG_NET_CLS_ACT */ |
|
|
|
return skb; |
|
} |
|
|
|
static struct netdev_queue * |
|
netdev_tx_queue_mapping(struct net_device *dev, struct sk_buff *skb) |
|
{ |
|
int qm = skb_get_queue_mapping(skb); |
|
|
|
return netdev_get_tx_queue(dev, netdev_cap_txqueue(dev, qm)); |
|
} |
|
|
|
static bool netdev_xmit_txqueue_skipped(void) |
|
{ |
|
return __this_cpu_read(softnet_data.xmit.skip_txqueue); |
|
} |
|
|
|
void netdev_xmit_skip_txqueue(bool skip) |
|
{ |
|
__this_cpu_write(softnet_data.xmit.skip_txqueue, skip); |
|
} |
|
EXPORT_SYMBOL_GPL(netdev_xmit_skip_txqueue); |
|
#endif /* CONFIG_NET_EGRESS */ |
|
|
|
#ifdef CONFIG_XPS |
|
static int __get_xps_queue_idx(struct net_device *dev, struct sk_buff *skb, |
|
struct xps_dev_maps *dev_maps, unsigned int tci) |
|
{ |
|
int tc = netdev_get_prio_tc_map(dev, skb->priority); |
|
struct xps_map *map; |
|
int queue_index = -1; |
|
|
|
if (tc >= dev_maps->num_tc || tci >= dev_maps->nr_ids) |
|
return queue_index; |
|
|
|
tci *= dev_maps->num_tc; |
|
tci += tc; |
|
|
|
map = rcu_dereference(dev_maps->attr_map[tci]); |
|
if (map) { |
|
if (map->len == 1) |
|
queue_index = map->queues[0]; |
|
else |
|
queue_index = map->queues[reciprocal_scale( |
|
skb_get_hash(skb), map->len)]; |
|
if (unlikely(queue_index >= dev->real_num_tx_queues)) |
|
queue_index = -1; |
|
} |
|
return queue_index; |
|
} |
|
#endif |
|
|
|
static int get_xps_queue(struct net_device *dev, struct net_device *sb_dev, |
|
struct sk_buff *skb) |
|
{ |
|
#ifdef CONFIG_XPS |
|
struct xps_dev_maps *dev_maps; |
|
struct sock *sk = skb->sk; |
|
int queue_index = -1; |
|
|
|
if (!static_key_false(&xps_needed)) |
|
return -1; |
|
|
|
rcu_read_lock(); |
|
if (!static_key_false(&xps_rxqs_needed)) |
|
goto get_cpus_map; |
|
|
|
dev_maps = rcu_dereference(sb_dev->xps_maps[XPS_RXQS]); |
|
if (dev_maps) { |
|
int tci = sk_rx_queue_get(sk); |
|
|
|
if (tci >= 0) |
|
queue_index = __get_xps_queue_idx(dev, skb, dev_maps, |
|
tci); |
|
} |
|
|
|
get_cpus_map: |
|
if (queue_index < 0) { |
|
dev_maps = rcu_dereference(sb_dev->xps_maps[XPS_CPUS]); |
|
if (dev_maps) { |
|
unsigned int tci = skb->sender_cpu - 1; |
|
|
|
queue_index = __get_xps_queue_idx(dev, skb, dev_maps, |
|
tci); |
|
} |
|
} |
|
rcu_read_unlock(); |
|
|
|
return queue_index; |
|
#else |
|
return -1; |
|
#endif |
|
} |
|
|
|
u16 dev_pick_tx_zero(struct net_device *dev, struct sk_buff *skb, |
|
struct net_device *sb_dev) |
|
{ |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(dev_pick_tx_zero); |
|
|
|
u16 dev_pick_tx_cpu_id(struct net_device *dev, struct sk_buff *skb, |
|
struct net_device *sb_dev) |
|
{ |
|
return (u16)raw_smp_processor_id() % dev->real_num_tx_queues; |
|
} |
|
EXPORT_SYMBOL(dev_pick_tx_cpu_id); |
|
|
|
u16 netdev_pick_tx(struct net_device *dev, struct sk_buff *skb, |
|
struct net_device *sb_dev) |
|
{ |
|
struct sock *sk = skb->sk; |
|
int queue_index = sk_tx_queue_get(sk); |
|
|
|
sb_dev = sb_dev ? : dev; |
|
|
|
if (queue_index < 0 || skb->ooo_okay || |
|
queue_index >= dev->real_num_tx_queues) { |
|
int new_index = get_xps_queue(dev, sb_dev, skb); |
|
|
|
if (new_index < 0) |
|
new_index = skb_tx_hash(dev, sb_dev, skb); |
|
|
|
if (queue_index != new_index && sk && |
|
sk_fullsock(sk) && |
|
rcu_access_pointer(sk->sk_dst_cache)) |
|
sk_tx_queue_set(sk, new_index); |
|
|
|
queue_index = new_index; |
|
} |
|
|
|
return queue_index; |
|
} |
|
EXPORT_SYMBOL(netdev_pick_tx); |
|
|
|
struct netdev_queue *netdev_core_pick_tx(struct net_device *dev, |
|
struct sk_buff *skb, |
|
struct net_device *sb_dev) |
|
{ |
|
int queue_index = 0; |
|
|
|
#ifdef CONFIG_XPS |
|
u32 sender_cpu = skb->sender_cpu - 1; |
|
|
|
if (sender_cpu >= (u32)NR_CPUS) |
|
skb->sender_cpu = raw_smp_processor_id() + 1; |
|
#endif |
|
|
|
if (dev->real_num_tx_queues != 1) { |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
|
|
if (ops->ndo_select_queue) |
|
queue_index = ops->ndo_select_queue(dev, skb, sb_dev); |
|
else |
|
queue_index = netdev_pick_tx(dev, skb, sb_dev); |
|
|
|
queue_index = netdev_cap_txqueue(dev, queue_index); |
|
} |
|
|
|
skb_set_queue_mapping(skb, queue_index); |
|
return netdev_get_tx_queue(dev, queue_index); |
|
} |
|
|
|
/** |
|
* __dev_queue_xmit() - transmit a buffer |
|
* @skb: buffer to transmit |
|
* @sb_dev: suboordinate device used for L2 forwarding offload |
|
* |
|
* Queue a buffer for transmission to a network device. The caller must |
|
* have set the device and priority and built the buffer before calling |
|
* this function. The function can be called from an interrupt. |
|
* |
|
* When calling this method, interrupts MUST be enabled. This is because |
|
* the BH enable code must have IRQs enabled so that it will not deadlock. |
|
* |
|
* Regardless of the return value, the skb is consumed, so it is currently |
|
* difficult to retry a send to this method. (You can bump the ref count |
|
* before sending to hold a reference for retry if you are careful.) |
|
* |
|
* Return: |
|
* * 0 - buffer successfully transmitted |
|
* * positive qdisc return code - NET_XMIT_DROP etc. |
|
* * negative errno - other errors |
|
*/ |
|
int __dev_queue_xmit(struct sk_buff *skb, struct net_device *sb_dev) |
|
{ |
|
struct net_device *dev = skb->dev; |
|
struct netdev_queue *txq = NULL; |
|
struct Qdisc *q; |
|
int rc = -ENOMEM; |
|
bool again = false; |
|
|
|
skb_reset_mac_header(skb); |
|
skb_assert_len(skb); |
|
|
|
if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP)) |
|
__skb_tstamp_tx(skb, NULL, NULL, skb->sk, SCM_TSTAMP_SCHED); |
|
|
|
/* Disable soft irqs for various locks below. Also |
|
* stops preemption for RCU. |
|
*/ |
|
rcu_read_lock_bh(); |
|
|
|
skb_update_prio(skb); |
|
|
|
qdisc_pkt_len_init(skb); |
|
#ifdef CONFIG_NET_CLS_ACT |
|
skb->tc_at_ingress = 0; |
|
#endif |
|
#ifdef CONFIG_NET_EGRESS |
|
if (static_branch_unlikely(&egress_needed_key)) { |
|
if (nf_hook_egress_active()) { |
|
skb = nf_hook_egress(skb, &rc, dev); |
|
if (!skb) |
|
goto out; |
|
} |
|
|
|
netdev_xmit_skip_txqueue(false); |
|
|
|
nf_skip_egress(skb, true); |
|
skb = sch_handle_egress(skb, &rc, dev); |
|
if (!skb) |
|
goto out; |
|
nf_skip_egress(skb, false); |
|
|
|
if (netdev_xmit_txqueue_skipped()) |
|
txq = netdev_tx_queue_mapping(dev, skb); |
|
} |
|
#endif |
|
/* If device/qdisc don't need skb->dst, release it right now while |
|
* its hot in this cpu cache. |
|
*/ |
|
if (dev->priv_flags & IFF_XMIT_DST_RELEASE) |
|
skb_dst_drop(skb); |
|
else |
|
skb_dst_force(skb); |
|
|
|
if (!txq) |
|
txq = netdev_core_pick_tx(dev, skb, sb_dev); |
|
|
|
q = rcu_dereference_bh(txq->qdisc); |
|
|
|
trace_net_dev_queue(skb); |
|
if (q->enqueue) { |
|
rc = __dev_xmit_skb(skb, q, dev, txq); |
|
goto out; |
|
} |
|
|
|
/* The device has no queue. Common case for software devices: |
|
* loopback, all the sorts of tunnels... |
|
|
|
* Really, it is unlikely that netif_tx_lock protection is necessary |
|
* here. (f.e. loopback and IP tunnels are clean ignoring statistics |
|
* counters.) |
|
* However, it is possible, that they rely on protection |
|
* made by us here. |
|
|
|
* Check this and shot the lock. It is not prone from deadlocks. |
|
*Either shot noqueue qdisc, it is even simpler 8) |
|
*/ |
|
if (dev->flags & IFF_UP) { |
|
int cpu = smp_processor_id(); /* ok because BHs are off */ |
|
|
|
/* Other cpus might concurrently change txq->xmit_lock_owner |
|
* to -1 or to their cpu id, but not to our id. |
|
*/ |
|
if (READ_ONCE(txq->xmit_lock_owner) != cpu) { |
|
if (dev_xmit_recursion()) |
|
goto recursion_alert; |
|
|
|
skb = validate_xmit_skb(skb, dev, &again); |
|
if (!skb) |
|
goto out; |
|
|
|
HARD_TX_LOCK(dev, txq, cpu); |
|
|
|
if (!netif_xmit_stopped(txq)) { |
|
dev_xmit_recursion_inc(); |
|
skb = dev_hard_start_xmit(skb, dev, txq, &rc); |
|
dev_xmit_recursion_dec(); |
|
if (dev_xmit_complete(rc)) { |
|
HARD_TX_UNLOCK(dev, txq); |
|
goto out; |
|
} |
|
} |
|
HARD_TX_UNLOCK(dev, txq); |
|
net_crit_ratelimited("Virtual device %s asks to queue packet!\n", |
|
dev->name); |
|
} else { |
|
/* Recursion is detected! It is possible, |
|
* unfortunately |
|
*/ |
|
recursion_alert: |
|
net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n", |
|
dev->name); |
|
} |
|
} |
|
|
|
rc = -ENETDOWN; |
|
rcu_read_unlock_bh(); |
|
|
|
dev_core_stats_tx_dropped_inc(dev); |
|
kfree_skb_list(skb); |
|
return rc; |
|
out: |
|
rcu_read_unlock_bh(); |
|
return rc; |
|
} |
|
EXPORT_SYMBOL(__dev_queue_xmit); |
|
|
|
int __dev_direct_xmit(struct sk_buff *skb, u16 queue_id) |
|
{ |
|
struct net_device *dev = skb->dev; |
|
struct sk_buff *orig_skb = skb; |
|
struct netdev_queue *txq; |
|
int ret = NETDEV_TX_BUSY; |
|
bool again = false; |
|
|
|
if (unlikely(!netif_running(dev) || |
|
!netif_carrier_ok(dev))) |
|
goto drop; |
|
|
|
skb = validate_xmit_skb_list(skb, dev, &again); |
|
if (skb != orig_skb) |
|
goto drop; |
|
|
|
skb_set_queue_mapping(skb, queue_id); |
|
txq = skb_get_tx_queue(dev, skb); |
|
|
|
local_bh_disable(); |
|
|
|
dev_xmit_recursion_inc(); |
|
HARD_TX_LOCK(dev, txq, smp_processor_id()); |
|
if (!netif_xmit_frozen_or_drv_stopped(txq)) |
|
ret = netdev_start_xmit(skb, dev, txq, false); |
|
HARD_TX_UNLOCK(dev, txq); |
|
dev_xmit_recursion_dec(); |
|
|
|
local_bh_enable(); |
|
return ret; |
|
drop: |
|
dev_core_stats_tx_dropped_inc(dev); |
|
kfree_skb_list(skb); |
|
return NET_XMIT_DROP; |
|
} |
|
EXPORT_SYMBOL(__dev_direct_xmit); |
|
|
|
/************************************************************************* |
|
* Receiver routines |
|
*************************************************************************/ |
|
|
|
int netdev_max_backlog __read_mostly = 1000; |
|
EXPORT_SYMBOL(netdev_max_backlog); |
|
|
|
int netdev_tstamp_prequeue __read_mostly = 1; |
|
unsigned int sysctl_skb_defer_max __read_mostly = 64; |
|
int netdev_budget __read_mostly = 300; |
|
/* Must be at least 2 jiffes to guarantee 1 jiffy timeout */ |
|
unsigned int __read_mostly netdev_budget_usecs = 2 * USEC_PER_SEC / HZ; |
|
int weight_p __read_mostly = 64; /* old backlog weight */ |
|
int dev_weight_rx_bias __read_mostly = 1; /* bias for backlog weight */ |
|
int dev_weight_tx_bias __read_mostly = 1; /* bias for output_queue quota */ |
|
int dev_rx_weight __read_mostly = 64; |
|
int dev_tx_weight __read_mostly = 64; |
|
|
|
/* Called with irq disabled */ |
|
static inline void ____napi_schedule(struct softnet_data *sd, |
|
struct napi_struct *napi) |
|
{ |
|
struct task_struct *thread; |
|
|
|
lockdep_assert_irqs_disabled(); |
|
|
|
if (test_bit(NAPI_STATE_THREADED, &napi->state)) { |
|
/* Paired with smp_mb__before_atomic() in |
|
* napi_enable()/dev_set_threaded(). |
|
* Use READ_ONCE() to guarantee a complete |
|
* read on napi->thread. Only call |
|
* wake_up_process() when it's not NULL. |
|
*/ |
|
thread = READ_ONCE(napi->thread); |
|
if (thread) { |
|
/* Avoid doing set_bit() if the thread is in |
|
* INTERRUPTIBLE state, cause napi_thread_wait() |
|
* makes sure to proceed with napi polling |
|
* if the thread is explicitly woken from here. |
|
*/ |
|
if (READ_ONCE(thread->__state) != TASK_INTERRUPTIBLE) |
|
set_bit(NAPI_STATE_SCHED_THREADED, &napi->state); |
|
wake_up_process(thread); |
|
return; |
|
} |
|
} |
|
|
|
list_add_tail(&napi->poll_list, &sd->poll_list); |
|
__raise_softirq_irqoff(NET_RX_SOFTIRQ); |
|
} |
|
|
|
#ifdef CONFIG_RPS |
|
|
|
/* One global table that all flow-based protocols share. */ |
|
struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
|
EXPORT_SYMBOL(rps_sock_flow_table); |
|
u32 rps_cpu_mask __read_mostly; |
|
EXPORT_SYMBOL(rps_cpu_mask); |
|
|
|
struct static_key_false rps_needed __read_mostly; |
|
EXPORT_SYMBOL(rps_needed); |
|
struct static_key_false rfs_needed __read_mostly; |
|
EXPORT_SYMBOL(rfs_needed); |
|
|
|
static struct rps_dev_flow * |
|
set_rps_cpu(struct net_device *dev, struct sk_buff *skb, |
|
struct rps_dev_flow *rflow, u16 next_cpu) |
|
{ |
|
if (next_cpu < nr_cpu_ids) { |
|
#ifdef CONFIG_RFS_ACCEL |
|
struct netdev_rx_queue *rxqueue; |
|
struct rps_dev_flow_table *flow_table; |
|
struct rps_dev_flow *old_rflow; |
|
u32 flow_id; |
|
u16 rxq_index; |
|
int rc; |
|
|
|
/* Should we steer this flow to a different hardware queue? */ |
|
if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap || |
|
!(dev->features & NETIF_F_NTUPLE)) |
|
goto out; |
|
rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); |
|
if (rxq_index == skb_get_rx_queue(skb)) |
|
goto out; |
|
|
|
rxqueue = dev->_rx + rxq_index; |
|
flow_table = rcu_dereference(rxqueue->rps_flow_table); |
|
if (!flow_table) |
|
goto out; |
|
flow_id = skb_get_hash(skb) & flow_table->mask; |
|
rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, |
|
rxq_index, flow_id); |
|
if (rc < 0) |
|
goto out; |
|
old_rflow = rflow; |
|
rflow = &flow_table->flows[flow_id]; |
|
rflow->filter = rc; |
|
if (old_rflow->filter == rflow->filter) |
|
old_rflow->filter = RPS_NO_FILTER; |
|
out: |
|
#endif |
|
rflow->last_qtail = |
|
per_cpu(softnet_data, next_cpu).input_queue_head; |
|
} |
|
|
|
rflow->cpu = next_cpu; |
|
return rflow; |
|
} |
|
|
|
/* |
|
* get_rps_cpu is called from netif_receive_skb and returns the target |
|
* CPU from the RPS map of the receiving queue for a given skb. |
|
* rcu_read_lock must be held on entry. |
|
*/ |
|
static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, |
|
struct rps_dev_flow **rflowp) |
|
{ |
|
const struct rps_sock_flow_table *sock_flow_table; |
|
struct netdev_rx_queue *rxqueue = dev->_rx; |
|
struct rps_dev_flow_table *flow_table; |
|
struct rps_map *map; |
|
int cpu = -1; |
|
u32 tcpu; |
|
u32 hash; |
|
|
|
if (skb_rx_queue_recorded(skb)) { |
|
u16 index = skb_get_rx_queue(skb); |
|
|
|
if (unlikely(index >= dev->real_num_rx_queues)) { |
|
WARN_ONCE(dev->real_num_rx_queues > 1, |
|
"%s received packet on queue %u, but number " |
|
"of RX queues is %u\n", |
|
dev->name, index, dev->real_num_rx_queues); |
|
goto done; |
|
} |
|
rxqueue += index; |
|
} |
|
|
|
/* Avoid computing hash if RFS/RPS is not active for this rxqueue */ |
|
|
|
flow_table = rcu_dereference(rxqueue->rps_flow_table); |
|
map = rcu_dereference(rxqueue->rps_map); |
|
if (!flow_table && !map) |
|
goto done; |
|
|
|
skb_reset_network_header(skb); |
|
hash = skb_get_hash(skb); |
|
if (!hash) |
|
goto done; |
|
|
|
sock_flow_table = rcu_dereference(rps_sock_flow_table); |
|
if (flow_table && sock_flow_table) { |
|
struct rps_dev_flow *rflow; |
|
u32 next_cpu; |
|
u32 ident; |
|
|
|
/* First check into global flow table if there is a match */ |
|
ident = sock_flow_table->ents[hash & sock_flow_table->mask]; |
|
if ((ident ^ hash) & ~rps_cpu_mask) |
|
goto try_rps; |
|
|
|
next_cpu = ident & rps_cpu_mask; |
|
|
|
/* OK, now we know there is a match, |
|
* we can look at the local (per receive queue) flow table |
|
*/ |
|
rflow = &flow_table->flows[hash & flow_table->mask]; |
|
tcpu = rflow->cpu; |
|
|
|
/* |
|
* If the desired CPU (where last recvmsg was done) is |
|
* different from current CPU (one in the rx-queue flow |
|
* table entry), switch if one of the following holds: |
|
* - Current CPU is unset (>= nr_cpu_ids). |
|
* - Current CPU is offline. |
|
* - The current CPU's queue tail has advanced beyond the |
|
* last packet that was enqueued using this table entry. |
|
* This guarantees that all previous packets for the flow |
|
* have been dequeued, thus preserving in order delivery. |
|
*/ |
|
if (unlikely(tcpu != next_cpu) && |
|
(tcpu >= nr_cpu_ids || !cpu_online(tcpu) || |
|
((int)(per_cpu(softnet_data, tcpu).input_queue_head - |
|
rflow->last_qtail)) >= 0)) { |
|
tcpu = next_cpu; |
|
rflow = set_rps_cpu(dev, skb, rflow, next_cpu); |
|
} |
|
|
|
if (tcpu < nr_cpu_ids && cpu_online(tcpu)) { |
|
*rflowp = rflow; |
|
cpu = tcpu; |
|
goto done; |
|
} |
|
} |
|
|
|
try_rps: |
|
|
|
if (map) { |
|
tcpu = map->cpus[reciprocal_scale(hash, map->len)]; |
|
if (cpu_online(tcpu)) { |
|
cpu = tcpu; |
|
goto done; |
|
} |
|
} |
|
|
|
done: |
|
return cpu; |
|
} |
|
|
|
#ifdef CONFIG_RFS_ACCEL |
|
|
|
/** |
|
* rps_may_expire_flow - check whether an RFS hardware filter may be removed |
|
* @dev: Device on which the filter was set |
|
* @rxq_index: RX queue index |
|
* @flow_id: Flow ID passed to ndo_rx_flow_steer() |
|
* @filter_id: Filter ID returned by ndo_rx_flow_steer() |
|
* |
|
* Drivers that implement ndo_rx_flow_steer() should periodically call |
|
* this function for each installed filter and remove the filters for |
|
* which it returns %true. |
|
*/ |
|
bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, |
|
u32 flow_id, u16 filter_id) |
|
{ |
|
struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; |
|
struct rps_dev_flow_table *flow_table; |
|
struct rps_dev_flow *rflow; |
|
bool expire = true; |
|
unsigned int cpu; |
|
|
|
rcu_read_lock(); |
|
flow_table = rcu_dereference(rxqueue->rps_flow_table); |
|
if (flow_table && flow_id <= flow_table->mask) { |
|
rflow = &flow_table->flows[flow_id]; |
|
cpu = READ_ONCE(rflow->cpu); |
|
if (rflow->filter == filter_id && cpu < nr_cpu_ids && |
|
((int)(per_cpu(softnet_data, cpu).input_queue_head - |
|
rflow->last_qtail) < |
|
(int)(10 * flow_table->mask))) |
|
expire = false; |
|
} |
|
rcu_read_unlock(); |
|
return expire; |
|
} |
|
EXPORT_SYMBOL(rps_may_expire_flow); |
|
|
|
#endif /* CONFIG_RFS_ACCEL */ |
|
|
|
/* Called from hardirq (IPI) context */ |
|
static void rps_trigger_softirq(void *data) |
|
{ |
|
struct softnet_data *sd = data; |
|
|
|
____napi_schedule(sd, &sd->backlog); |
|
sd->received_rps++; |
|
} |
|
|
|
#endif /* CONFIG_RPS */ |
|
|
|
/* Called from hardirq (IPI) context */ |
|
static void trigger_rx_softirq(void *data) |
|
{ |
|
struct softnet_data *sd = data; |
|
|
|
__raise_softirq_irqoff(NET_RX_SOFTIRQ); |
|
smp_store_release(&sd->defer_ipi_scheduled, 0); |
|
} |
|
|
|
/* |
|
* Check if this softnet_data structure is another cpu one |
|
* If yes, queue it to our IPI list and return 1 |
|
* If no, return 0 |
|
*/ |
|
static int napi_schedule_rps(struct softnet_data *sd) |
|
{ |
|
struct softnet_data *mysd = this_cpu_ptr(&softnet_data); |
|
|
|
#ifdef CONFIG_RPS |
|
if (sd != mysd) { |
|
sd->rps_ipi_next = mysd->rps_ipi_list; |
|
mysd->rps_ipi_list = sd; |
|
|
|
__raise_softirq_irqoff(NET_RX_SOFTIRQ); |
|
return 1; |
|
} |
|
#endif /* CONFIG_RPS */ |
|
__napi_schedule_irqoff(&mysd->backlog); |
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_NET_FLOW_LIMIT |
|
int netdev_flow_limit_table_len __read_mostly = (1 << 12); |
|
#endif |
|
|
|
static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen) |
|
{ |
|
#ifdef CONFIG_NET_FLOW_LIMIT |
|
struct sd_flow_limit *fl; |
|
struct softnet_data *sd; |
|
unsigned int old_flow, new_flow; |
|
|
|
if (qlen < (READ_ONCE(netdev_max_backlog) >> 1)) |
|
return false; |
|
|
|
sd = this_cpu_ptr(&softnet_data); |
|
|
|
rcu_read_lock(); |
|
fl = rcu_dereference(sd->flow_limit); |
|
if (fl) { |
|
new_flow = skb_get_hash(skb) & (fl->num_buckets - 1); |
|
old_flow = fl->history[fl->history_head]; |
|
fl->history[fl->history_head] = new_flow; |
|
|
|
fl->history_head++; |
|
fl->history_head &= FLOW_LIMIT_HISTORY - 1; |
|
|
|
if (likely(fl->buckets[old_flow])) |
|
fl->buckets[old_flow]--; |
|
|
|
if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) { |
|
fl->count++; |
|
rcu_read_unlock(); |
|
return true; |
|
} |
|
} |
|
rcu_read_unlock(); |
|
#endif |
|
return false; |
|
} |
|
|
|
/* |
|
* enqueue_to_backlog is called to queue an skb to a per CPU backlog |
|
* queue (may be a remote CPU queue). |
|
*/ |
|
static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
|
unsigned int *qtail) |
|
{ |
|
enum skb_drop_reason reason; |
|
struct softnet_data *sd; |
|
unsigned long flags; |
|
unsigned int qlen; |
|
|
|
reason = SKB_DROP_REASON_NOT_SPECIFIED; |
|
sd = &per_cpu(softnet_data, cpu); |
|
|
|
rps_lock_irqsave(sd, &flags); |
|
if (!netif_running(skb->dev)) |
|
goto drop; |
|
qlen = skb_queue_len(&sd->input_pkt_queue); |
|
if (qlen <= READ_ONCE(netdev_max_backlog) && !skb_flow_limit(skb, qlen)) { |
|
if (qlen) { |
|
enqueue: |
|
__skb_queue_tail(&sd->input_pkt_queue, skb); |
|
input_queue_tail_incr_save(sd, qtail); |
|
rps_unlock_irq_restore(sd, &flags); |
|
return NET_RX_SUCCESS; |
|
} |
|
|
|
/* Schedule NAPI for backlog device |
|
* We can use non atomic operation since we own the queue lock |
|
*/ |
|
if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) |
|
napi_schedule_rps(sd); |
|
goto enqueue; |
|
} |
|
reason = SKB_DROP_REASON_CPU_BACKLOG; |
|
|
|
drop: |
|
sd->dropped++; |
|
rps_unlock_irq_restore(sd, &flags); |
|
|
|
dev_core_stats_rx_dropped_inc(skb->dev); |
|
kfree_skb_reason(skb, reason); |
|
return NET_RX_DROP; |
|
} |
|
|
|
static struct netdev_rx_queue *netif_get_rxqueue(struct sk_buff *skb) |
|
{ |
|
struct net_device *dev = skb->dev; |
|
struct netdev_rx_queue *rxqueue; |
|
|
|
rxqueue = dev->_rx; |
|
|
|
if (skb_rx_queue_recorded(skb)) { |
|
u16 index = skb_get_rx_queue(skb); |
|
|
|
if (unlikely(index >= dev->real_num_rx_queues)) { |
|
WARN_ONCE(dev->real_num_rx_queues > 1, |
|
"%s received packet on queue %u, but number " |
|
"of RX queues is %u\n", |
|
dev->name, index, dev->real_num_rx_queues); |
|
|
|
return rxqueue; /* Return first rxqueue */ |
|
} |
|
rxqueue += index; |
|
} |
|
return rxqueue; |
|
} |
|
|
|
u32 bpf_prog_run_generic_xdp(struct sk_buff *skb, struct xdp_buff *xdp, |
|
struct bpf_prog *xdp_prog) |
|
{ |
|
void *orig_data, *orig_data_end, *hard_start; |
|
struct netdev_rx_queue *rxqueue; |
|
bool orig_bcast, orig_host; |
|
u32 mac_len, frame_sz; |
|
__be16 orig_eth_type; |
|
struct ethhdr *eth; |
|
u32 metalen, act; |
|
int off; |
|
|
|
/* The XDP program wants to see the packet starting at the MAC |
|
* header. |
|
*/ |
|
mac_len = skb->data - skb_mac_header(skb); |
|
hard_start = skb->data - skb_headroom(skb); |
|
|
|
/* SKB "head" area always have tailroom for skb_shared_info */ |
|
frame_sz = (void *)skb_end_pointer(skb) - hard_start; |
|
frame_sz += SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
|
|
|
rxqueue = netif_get_rxqueue(skb); |
|
xdp_init_buff(xdp, frame_sz, &rxqueue->xdp_rxq); |
|
xdp_prepare_buff(xdp, hard_start, skb_headroom(skb) - mac_len, |
|
skb_headlen(skb) + mac_len, true); |
|
|
|
orig_data_end = xdp->data_end; |
|
orig_data = xdp->data; |
|
eth = (struct ethhdr *)xdp->data; |
|
orig_host = ether_addr_equal_64bits(eth->h_dest, skb->dev->dev_addr); |
|
orig_bcast = is_multicast_ether_addr_64bits(eth->h_dest); |
|
orig_eth_type = eth->h_proto; |
|
|
|
act = bpf_prog_run_xdp(xdp_prog, xdp); |
|
|
|
/* check if bpf_xdp_adjust_head was used */ |
|
off = xdp->data - orig_data; |
|
if (off) { |
|
if (off > 0) |
|
__skb_pull(skb, off); |
|
else if (off < 0) |
|
__skb_push(skb, -off); |
|
|
|
skb->mac_header += off; |
|
skb_reset_network_header(skb); |
|
} |
|
|
|
/* check if bpf_xdp_adjust_tail was used */ |
|
off = xdp->data_end - orig_data_end; |
|
if (off != 0) { |
|
skb_set_tail_pointer(skb, xdp->data_end - xdp->data); |
|
skb->len += off; /* positive on grow, negative on shrink */ |
|
} |
|
|
|
/* check if XDP changed eth hdr such SKB needs update */ |
|
eth = (struct ethhdr *)xdp->data; |
|
if ((orig_eth_type != eth->h_proto) || |
|
(orig_host != ether_addr_equal_64bits(eth->h_dest, |
|
skb->dev->dev_addr)) || |
|
(orig_bcast != is_multicast_ether_addr_64bits(eth->h_dest))) { |
|
__skb_push(skb, ETH_HLEN); |
|
skb->pkt_type = PACKET_HOST; |
|
skb->protocol = eth_type_trans(skb, skb->dev); |
|
} |
|
|
|
/* Redirect/Tx gives L2 packet, code that will reuse skb must __skb_pull |
|
* before calling us again on redirect path. We do not call do_redirect |
|
* as we leave that up to the caller. |
|
* |
|
* Caller is responsible for managing lifetime of skb (i.e. calling |
|
* kfree_skb in response to actions it cannot handle/XDP_DROP). |
|
*/ |
|
switch (act) { |
|
case XDP_REDIRECT: |
|
case XDP_TX: |
|
__skb_push(skb, mac_len); |
|
break; |
|
case XDP_PASS: |
|
metalen = xdp->data - xdp->data_meta; |
|
if (metalen) |
|
skb_metadata_set(skb, metalen); |
|
break; |
|
} |
|
|
|
return act; |
|
} |
|
|
|
static u32 netif_receive_generic_xdp(struct sk_buff *skb, |
|
struct xdp_buff *xdp, |
|
struct bpf_prog *xdp_prog) |
|
{ |
|
u32 act = XDP_DROP; |
|
|
|
/* Reinjected packets coming from act_mirred or similar should |
|
* not get XDP generic processing. |
|
*/ |
|
if (skb_is_redirected(skb)) |
|
return XDP_PASS; |
|
|
|
/* XDP packets must be linear and must have sufficient headroom |
|
* of XDP_PACKET_HEADROOM bytes. This is the guarantee that also |
|
* native XDP provides, thus we need to do it here as well. |
|
*/ |
|
if (skb_cloned(skb) || skb_is_nonlinear(skb) || |
|
skb_headroom(skb) < XDP_PACKET_HEADROOM) { |
|
int hroom = XDP_PACKET_HEADROOM - skb_headroom(skb); |
|
int troom = skb->tail + skb->data_len - skb->end; |
|
|
|
/* In case we have to go down the path and also linearize, |
|
* then lets do the pskb_expand_head() work just once here. |
|
*/ |
|
if (pskb_expand_head(skb, |
|
hroom > 0 ? ALIGN(hroom, NET_SKB_PAD) : 0, |
|
troom > 0 ? troom + 128 : 0, GFP_ATOMIC)) |
|
goto do_drop; |
|
if (skb_linearize(skb)) |
|
goto do_drop; |
|
} |
|
|
|
act = bpf_prog_run_generic_xdp(skb, xdp, xdp_prog); |
|
switch (act) { |
|
case XDP_REDIRECT: |
|
case XDP_TX: |
|
case XDP_PASS: |
|
break; |
|
default: |
|
bpf_warn_invalid_xdp_action(skb->dev, xdp_prog, act); |
|
fallthrough; |
|
case XDP_ABORTED: |
|
trace_xdp_exception(skb->dev, xdp_prog, act); |
|
fallthrough; |
|
case XDP_DROP: |
|
do_drop: |
|
kfree_skb(skb); |
|
break; |
|
} |
|
|
|
return act; |
|
} |
|
|
|
/* When doing generic XDP we have to bypass the qdisc layer and the |
|
* network taps in order to match in-driver-XDP behavior. This also means |
|
* that XDP packets are able to starve other packets going through a qdisc, |
|
* and DDOS attacks will be more effective. In-driver-XDP use dedicated TX |
|
* queues, so they do not have this starvation issue. |
|
*/ |
|
void generic_xdp_tx(struct sk_buff *skb, struct bpf_prog *xdp_prog) |
|
{ |
|
struct net_device *dev = skb->dev; |
|
struct netdev_queue *txq; |
|
bool free_skb = true; |
|
int cpu, rc; |
|
|
|
txq = netdev_core_pick_tx(dev, skb, NULL); |
|
cpu = smp_processor_id(); |
|
HARD_TX_LOCK(dev, txq, cpu); |
|
if (!netif_xmit_frozen_or_drv_stopped(txq)) { |
|
rc = netdev_start_xmit(skb, dev, txq, 0); |
|
if (dev_xmit_complete(rc)) |
|
free_skb = false; |
|
} |
|
HARD_TX_UNLOCK(dev, txq); |
|
if (free_skb) { |
|
trace_xdp_exception(dev, xdp_prog, XDP_TX); |
|
dev_core_stats_tx_dropped_inc(dev); |
|
kfree_skb(skb); |
|
} |
|
} |
|
|
|
static DEFINE_STATIC_KEY_FALSE(generic_xdp_needed_key); |
|
|
|
int do_xdp_generic(struct bpf_prog *xdp_prog, struct sk_buff *skb) |
|
{ |
|
if (xdp_prog) { |
|
struct xdp_buff xdp; |
|
u32 act; |
|
int err; |
|
|
|
act = netif_receive_generic_xdp(skb, &xdp, xdp_prog); |
|
if (act != XDP_PASS) { |
|
switch (act) { |
|
case XDP_REDIRECT: |
|
err = xdp_do_generic_redirect(skb->dev, skb, |
|
&xdp, xdp_prog); |
|
if (err) |
|
goto out_redir; |
|
break; |
|
case XDP_TX: |
|
generic_xdp_tx(skb, xdp_prog); |
|
break; |
|
} |
|
return XDP_DROP; |
|
} |
|
} |
|
return XDP_PASS; |
|
out_redir: |
|
kfree_skb_reason(skb, SKB_DROP_REASON_XDP); |
|
return XDP_DROP; |
|
} |
|
EXPORT_SYMBOL_GPL(do_xdp_generic); |
|
|
|
static int netif_rx_internal(struct sk_buff *skb) |
|
{ |
|
int ret; |
|
|
|
net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb); |
|
|
|
trace_netif_rx(skb); |
|
|
|
#ifdef CONFIG_RPS |
|
if (static_branch_unlikely(&rps_needed)) { |
|
struct rps_dev_flow voidflow, *rflow = &voidflow; |
|
int cpu; |
|
|
|
rcu_read_lock(); |
|
|
|
cpu = get_rps_cpu(skb->dev, skb, &rflow); |
|
if (cpu < 0) |
|
cpu = smp_processor_id(); |
|
|
|
ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
|
|
|
rcu_read_unlock(); |
|
} else |
|
#endif |
|
{ |
|
unsigned int qtail; |
|
|
|
ret = enqueue_to_backlog(skb, smp_processor_id(), &qtail); |
|
} |
|
return ret; |
|
} |
|
|
|
/** |
|
* __netif_rx - Slightly optimized version of netif_rx |
|
* @skb: buffer to post |
|
* |
|
* This behaves as netif_rx except that it does not disable bottom halves. |
|
* As a result this function may only be invoked from the interrupt context |
|
* (either hard or soft interrupt). |
|
*/ |
|
int __netif_rx(struct sk_buff *skb) |
|
{ |
|
int ret; |
|
|
|
lockdep_assert_once(hardirq_count() | softirq_count()); |
|
|
|
trace_netif_rx_entry(skb); |
|
ret = netif_rx_internal(skb); |
|
trace_netif_rx_exit(ret); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(__netif_rx); |
|
|
|
/** |
|
* netif_rx - post buffer to the network code |
|
* @skb: buffer to post |
|
* |
|
* This function receives a packet from a device driver and queues it for |
|
* the upper (protocol) levels to process via the backlog NAPI device. It |
|
* always succeeds. The buffer may be dropped during processing for |
|
* congestion control or by the protocol layers. |
|
* The network buffer is passed via the backlog NAPI device. Modern NIC |
|
* driver should use NAPI and GRO. |
|
* This function can used from interrupt and from process context. The |
|
* caller from process context must not disable interrupts before invoking |
|
* this function. |
|
* |
|
* return values: |
|
* NET_RX_SUCCESS (no congestion) |
|
* NET_RX_DROP (packet was dropped) |
|
* |
|
*/ |
|
int netif_rx(struct sk_buff *skb) |
|
{ |
|
bool need_bh_off = !(hardirq_count() | softirq_count()); |
|
int ret; |
|
|
|
if (need_bh_off) |
|
local_bh_disable(); |
|
trace_netif_rx_entry(skb); |
|
ret = netif_rx_internal(skb); |
|
trace_netif_rx_exit(ret); |
|
if (need_bh_off) |
|
local_bh_enable(); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(netif_rx); |
|
|
|
static __latent_entropy void net_tx_action(struct softirq_action *h) |
|
{ |
|
struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
|
|
|
if (sd->completion_queue) { |
|
struct sk_buff *clist; |
|
|
|
local_irq_disable(); |
|
clist = sd->completion_queue; |
|
sd->completion_queue = NULL; |
|
local_irq_enable(); |
|
|
|
while (clist) { |
|
struct sk_buff *skb = clist; |
|
|
|
clist = clist->next; |
|
|
|
WARN_ON(refcount_read(&skb->users)); |
|
if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED)) |
|
trace_consume_skb(skb); |
|
else |
|
trace_kfree_skb(skb, net_tx_action, |
|
SKB_DROP_REASON_NOT_SPECIFIED); |
|
|
|
if (skb->fclone != SKB_FCLONE_UNAVAILABLE) |
|
__kfree_skb(skb); |
|
else |
|
__kfree_skb_defer(skb); |
|
} |
|
} |
|
|
|
if (sd->output_queue) { |
|
struct Qdisc *head; |
|
|
|
local_irq_disable(); |
|
head = sd->output_queue; |
|
sd->output_queue = NULL; |
|
sd->output_queue_tailp = &sd->output_queue; |
|
local_irq_enable(); |
|
|
|
rcu_read_lock(); |
|
|
|
while (head) { |
|
struct Qdisc *q = head; |
|
spinlock_t *root_lock = NULL; |
|
|
|
head = head->next_sched; |
|
|
|
/* We need to make sure head->next_sched is read |
|
* before clearing __QDISC_STATE_SCHED |
|
*/ |
|
smp_mb__before_atomic(); |
|
|
|
if (!(q->flags & TCQ_F_NOLOCK)) { |
|
root_lock = qdisc_lock(q); |
|
spin_lock(root_lock); |
|
} else if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, |
|
&q->state))) { |
|
/* There is a synchronize_net() between |
|
* STATE_DEACTIVATED flag being set and |
|
* qdisc_reset()/some_qdisc_is_busy() in |
|
* dev_deactivate(), so we can safely bail out |
|
* early here to avoid data race between |
|
* qdisc_deactivate() and some_qdisc_is_busy() |
|
* for lockless qdisc. |
|
*/ |
|
clear_bit(__QDISC_STATE_SCHED, &q->state); |
|
continue; |
|
} |
|
|
|
clear_bit(__QDISC_STATE_SCHED, &q->state); |
|
qdisc_run(q); |
|
if (root_lock) |
|
spin_unlock(root_lock); |
|
} |
|
|
|
rcu_read_unlock(); |
|
} |
|
|
|
xfrm_dev_backlog(sd); |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_BRIDGE) && IS_ENABLED(CONFIG_ATM_LANE) |
|
/* This hook is defined here for ATM LANE */ |
|
int (*br_fdb_test_addr_hook)(struct net_device *dev, |
|
unsigned char *addr) __read_mostly; |
|
EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
|
#endif |
|
|
|
static inline struct sk_buff * |
|
sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret, |
|
struct net_device *orig_dev, bool *another) |
|
{ |
|
#ifdef CONFIG_NET_CLS_ACT |
|
struct mini_Qdisc *miniq = rcu_dereference_bh(skb->dev->miniq_ingress); |
|
struct tcf_result cl_res; |
|
|
|
/* If there's at least one ingress present somewhere (so |
|
* we get here via enabled static key), remaining devices |
|
* that are not configured with an ingress qdisc will bail |
|
* out here. |
|
*/ |
|
if (!miniq) |
|
return skb; |
|
|
|
if (*pt_prev) { |
|
*ret = deliver_skb(skb, *pt_prev, orig_dev); |
|
*pt_prev = NULL; |
|
} |
|
|
|
qdisc_skb_cb(skb)->pkt_len = skb->len; |
|
tc_skb_cb(skb)->mru = 0; |
|
tc_skb_cb(skb)->post_ct = false; |
|
skb->tc_at_ingress = 1; |
|
mini_qdisc_bstats_cpu_update(miniq, skb); |
|
|
|
switch (tcf_classify(skb, miniq->block, miniq->filter_list, &cl_res, false)) { |
|
case TC_ACT_OK: |
|
case TC_ACT_RECLASSIFY: |
|
skb->tc_index = TC_H_MIN(cl_res.classid); |
|
break; |
|
case TC_ACT_SHOT: |
|
mini_qdisc_qstats_cpu_drop(miniq); |
|
kfree_skb_reason(skb, SKB_DROP_REASON_TC_INGRESS); |
|
*ret = NET_RX_DROP; |
|
return NULL; |
|
case TC_ACT_STOLEN: |
|
case TC_ACT_QUEUED: |
|
case TC_ACT_TRAP: |
|
consume_skb(skb); |
|
*ret = NET_RX_SUCCESS; |
|
return NULL; |
|
case TC_ACT_REDIRECT: |
|
/* skb_mac_header check was done by cls/act_bpf, so |
|
* we can safely push the L2 header back before |
|
* redirecting to another netdev |
|
*/ |
|
__skb_push(skb, skb->mac_len); |
|
if (skb_do_redirect(skb) == -EAGAIN) { |
|
__skb_pull(skb, skb->mac_len); |
|
*another = true; |
|
break; |
|
} |
|
*ret = NET_RX_SUCCESS; |
|
return NULL; |
|
case TC_ACT_CONSUMED: |
|
*ret = NET_RX_SUCCESS; |
|
return NULL; |
|
default: |
|
break; |
|
} |
|
#endif /* CONFIG_NET_CLS_ACT */ |
|
return skb; |
|
} |
|
|
|
/** |
|
* netdev_is_rx_handler_busy - check if receive handler is registered |
|
* @dev: device to check |
|
* |
|
* Check if a receive handler is already registered for a given device. |
|
* Return true if there one. |
|
* |
|
* The caller must hold the rtnl_mutex. |
|
*/ |
|
bool netdev_is_rx_handler_busy(struct net_device *dev) |
|
{ |
|
ASSERT_RTNL(); |
|
return dev && rtnl_dereference(dev->rx_handler); |
|
} |
|
EXPORT_SYMBOL_GPL(netdev_is_rx_handler_busy); |
|
|
|
/** |
|
* netdev_rx_handler_register - register receive handler |
|
* @dev: device to register a handler for |
|
* @rx_handler: receive handler to register |
|
* @rx_handler_data: data pointer that is used by rx handler |
|
* |
|
* Register a receive handler for a device. This handler will then be |
|
* called from __netif_receive_skb. A negative errno code is returned |
|
* on a failure. |
|
* |
|
* The caller must hold the rtnl_mutex. |
|
* |
|
* For a general description of rx_handler, see enum rx_handler_result. |
|
*/ |
|
int netdev_rx_handler_register(struct net_device *dev, |
|
rx_handler_func_t *rx_handler, |
|
void *rx_handler_data) |
|
{ |
|
if (netdev_is_rx_handler_busy(dev)) |
|
return -EBUSY; |
|
|
|
if (dev->priv_flags & IFF_NO_RX_HANDLER) |
|
return -EINVAL; |
|
|
|
/* Note: rx_handler_data must be set before rx_handler */ |
|
rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
|
rcu_assign_pointer(dev->rx_handler, rx_handler); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(netdev_rx_handler_register); |
|
|
|
/** |
|
* netdev_rx_handler_unregister - unregister receive handler |
|
* @dev: device to unregister a handler from |
|
* |
|
* Unregister a receive handler from a device. |
|
* |
|
* The caller must hold the rtnl_mutex. |
|
*/ |
|
void netdev_rx_handler_unregister(struct net_device *dev) |
|
{ |
|
|
|
ASSERT_RTNL(); |
|
RCU_INIT_POINTER(dev->rx_handler, NULL); |
|
/* a reader seeing a non NULL rx_handler in a rcu_read_lock() |
|
* section has a guarantee to see a non NULL rx_handler_data |
|
* as well. |
|
*/ |
|
synchronize_net(); |
|
RCU_INIT_POINTER(dev->rx_handler_data, NULL); |
|
} |
|
EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); |
|
|
|
/* |
|
* Limit the use of PFMEMALLOC reserves to those protocols that implement |
|
* the special handling of PFMEMALLOC skbs. |
|
*/ |
|
static bool skb_pfmemalloc_protocol(struct sk_buff *skb) |
|
{ |
|
switch (skb->protocol) { |
|
case htons(ETH_P_ARP): |
|
case htons(ETH_P_IP): |
|
case htons(ETH_P_IPV6): |
|
case htons(ETH_P_8021Q): |
|
case htons(ETH_P_8021AD): |
|
return true; |
|
default: |
|
return false; |
|
} |
|
} |
|
|
|
static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev, |
|
int *ret, struct net_device *orig_dev) |
|
{ |
|
if (nf_hook_ingress_active(skb)) { |
|
int ingress_retval; |
|
|
|
if (*pt_prev) { |
|
*ret = deliver_skb(skb, *pt_prev, orig_dev); |
|
*pt_prev = NULL; |
|
} |
|
|
|
rcu_read_lock(); |
|
ingress_retval = nf_hook_ingress(skb); |
|
rcu_read_unlock(); |
|
return ingress_retval; |
|
} |
|
return 0; |
|
} |
|
|
|
static int __netif_receive_skb_core(struct sk_buff **pskb, bool pfmemalloc, |
|
struct packet_type **ppt_prev) |
|
{ |
|
struct packet_type *ptype, *pt_prev; |
|
rx_handler_func_t *rx_handler; |
|
struct sk_buff *skb = *pskb; |
|
struct net_device *orig_dev; |
|
bool deliver_exact = false; |
|
int ret = NET_RX_DROP; |
|
__be16 type; |
|
|
|
net_timestamp_check(!READ_ONCE(netdev_tstamp_prequeue), skb); |
|
|
|
trace_netif_receive_skb(skb); |
|
|
|
orig_dev = skb->dev; |
|
|
|
skb_reset_network_header(skb); |
|
if (!skb_transport_header_was_set(skb)) |
|
skb_reset_transport_header(skb); |
|
skb_reset_mac_len(skb); |
|
|
|
pt_prev = NULL; |
|
|
|
another_round: |
|
skb->skb_iif = skb->dev->ifindex; |
|
|
|
__this_cpu_inc(softnet_data.processed); |
|
|
|
if (static_branch_unlikely(&generic_xdp_needed_key)) { |
|
int ret2; |
|
|
|
migrate_disable(); |
|
ret2 = do_xdp_generic(rcu_dereference(skb->dev->xdp_prog), skb); |
|
migrate_enable(); |
|
|
|
if (ret2 != XDP_PASS) { |
|
ret = NET_RX_DROP; |
|
goto out; |
|
} |
|
} |
|
|
|
if (eth_type_vlan(skb->protocol)) { |
|
skb = skb_vlan_untag(skb); |
|
if (unlikely(!skb)) |
|
goto out; |
|
} |
|
|
|
if (skb_skip_tc_classify(skb)) |
|
goto skip_classify; |
|
|
|
if (pfmemalloc) |
|
goto skip_taps; |
|
|
|
list_for_each_entry_rcu(ptype, &ptype_all, list) { |
|
if (pt_prev) |
|
ret = deliver_skb(skb, pt_prev, orig_dev); |
|
pt_prev = ptype; |
|
} |
|
|
|
list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) { |
|
if (pt_prev) |
|
ret = deliver_skb(skb, pt_prev, orig_dev); |
|
pt_prev = ptype; |
|
} |
|
|
|
skip_taps: |
|
#ifdef CONFIG_NET_INGRESS |
|
if (static_branch_unlikely(&ingress_needed_key)) { |
|
bool another = false; |
|
|
|
nf_skip_egress(skb, true); |
|
skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev, |
|
&another); |
|
if (another) |
|
goto another_round; |
|
if (!skb) |
|
goto out; |
|
|
|
nf_skip_egress(skb, false); |
|
if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0) |
|
goto out; |
|
} |
|
#endif |
|
skb_reset_redirect(skb); |
|
skip_classify: |
|
if (pfmemalloc && !skb_pfmemalloc_protocol(skb)) |
|
goto drop; |
|
|
|
if (skb_vlan_tag_present(skb)) { |
|
if (pt_prev) { |
|
ret = deliver_skb(skb, pt_prev, orig_dev); |
|
pt_prev = NULL; |
|
} |
|
if (vlan_do_receive(&skb)) |
|
goto another_round; |
|
else if (unlikely(!skb)) |
|
goto out; |
|
} |
|
|
|
rx_handler = rcu_dereference(skb->dev->rx_handler); |
|
if (rx_handler) { |
|
if (pt_prev) { |
|
ret = deliver_skb(skb, pt_prev, orig_dev); |
|
pt_prev = NULL; |
|
} |
|
switch (rx_handler(&skb)) { |
|
case RX_HANDLER_CONSUMED: |
|
ret = NET_RX_SUCCESS; |
|
goto out; |
|
case RX_HANDLER_ANOTHER: |
|
goto another_round; |
|
case RX_HANDLER_EXACT: |
|
deliver_exact = true; |
|
break; |
|
case RX_HANDLER_PASS: |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
} |
|
|
|
if (unlikely(skb_vlan_tag_present(skb)) && !netdev_uses_dsa(skb->dev)) { |
|
check_vlan_id: |
|
if (skb_vlan_tag_get_id(skb)) { |
|
/* Vlan id is non 0 and vlan_do_receive() above couldn't |
|
* find vlan device. |
|
*/ |
|
skb->pkt_type = PACKET_OTHERHOST; |
|
} else if (eth_type_vlan(skb->protocol)) { |
|
/* Outer header is 802.1P with vlan 0, inner header is |
|
* 802.1Q or 802.1AD and vlan_do_receive() above could |
|
* not find vlan dev for vlan id 0. |
|
*/ |
|
__vlan_hwaccel_clear_tag(skb); |
|
skb = skb_vlan_untag(skb); |
|
if (unlikely(!skb)) |
|
goto out; |
|
if (vlan_do_receive(&skb)) |
|
/* After stripping off 802.1P header with vlan 0 |
|
* vlan dev is found for inner header. |
|
*/ |
|
goto another_round; |
|
else if (unlikely(!skb)) |
|
goto out; |
|
else |
|
/* We have stripped outer 802.1P vlan 0 header. |
|
* But could not find vlan dev. |
|
* check again for vlan id to set OTHERHOST. |
|
*/ |
|
goto check_vlan_id; |
|
} |
|
/* Note: we might in the future use prio bits |
|
* and set skb->priority like in vlan_do_receive() |
|
* For the time being, just ignore Priority Code Point |
|
*/ |
|
__vlan_hwaccel_clear_tag(skb); |
|
} |
|
|
|
type = skb->protocol; |
|
|
|
/* deliver only exact match when indicated */ |
|
if (likely(!deliver_exact)) { |
|
deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, |
|
&ptype_base[ntohs(type) & |
|
PTYPE_HASH_MASK]); |
|
} |
|
|
|
deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, |
|
&orig_dev->ptype_specific); |
|
|
|
if (unlikely(skb->dev != orig_dev)) { |
|
deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type, |
|
&skb->dev->ptype_specific); |
|
} |
|
|
|
if (pt_prev) { |
|
if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC))) |
|
goto drop; |
|
*ppt_prev = pt_prev; |
|
} else { |
|
drop: |
|
if (!deliver_exact) |
|
dev_core_stats_rx_dropped_inc(skb->dev); |
|
else |
|
dev_core_stats_rx_nohandler_inc(skb->dev); |
|
kfree_skb_reason(skb, SKB_DROP_REASON_UNHANDLED_PROTO); |
|
/* Jamal, now you will not able to escape explaining |
|
* me how you were going to use this. :-) |
|
*/ |
|
ret = NET_RX_DROP; |
|
} |
|
|
|
out: |
|
/* The invariant here is that if *ppt_prev is not NULL |
|
* then skb should also be non-NULL. |
|
* |
|
* Apparently *ppt_prev assignment above holds this invariant due to |
|
* skb dereferencing near it. |
|
*/ |
|
*pskb = skb; |
|
return ret; |
|
} |
|
|
|
static int __netif_receive_skb_one_core(struct sk_buff *skb, bool pfmemalloc) |
|
{ |
|
struct net_device *orig_dev = skb->dev; |
|
struct packet_type *pt_prev = NULL; |
|
int ret; |
|
|
|
ret = __netif_receive_skb_core(&skb, pfmemalloc, &pt_prev); |
|
if (pt_prev) |
|
ret = INDIRECT_CALL_INET(pt_prev->func, ipv6_rcv, ip_rcv, skb, |
|
skb->dev, pt_prev, orig_dev); |
|
return ret; |
|
} |
|
|
|
/** |
|
* netif_receive_skb_core - special purpose version of netif_receive_skb |
|
* @skb: buffer to process |
|
* |
|
* More direct receive version of netif_receive_skb(). It should |
|
* only be used by callers that have a need to skip RPS and Generic XDP. |
|
* Caller must also take care of handling if ``(page_is_)pfmemalloc``. |
|
* |
|
* This function may only be called from softirq context and interrupts |
|
* should be enabled. |
|
* |
|
* Return values (usually ignored): |
|
* NET_RX_SUCCESS: no congestion |
|
* NET_RX_DROP: packet was dropped |
|
*/ |
|
int netif_receive_skb_core(struct sk_buff *skb) |
|
{ |
|
int ret; |
|
|
|
rcu_read_lock(); |
|
ret = __netif_receive_skb_one_core(skb, false); |
|
rcu_read_unlock(); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(netif_receive_skb_core); |
|
|
|
static inline void __netif_receive_skb_list_ptype(struct list_head *head, |
|
struct packet_type *pt_prev, |
|
struct net_device *orig_dev) |
|
{ |
|
struct sk_buff *skb, *next; |
|
|
|
if (!pt_prev) |
|
return; |
|
if (list_empty(head)) |
|
return; |
|
if (pt_prev->list_func != NULL) |
|
INDIRECT_CALL_INET(pt_prev->list_func, ipv6_list_rcv, |
|
ip_list_rcv, head, pt_prev, orig_dev); |
|
else |
|
list_for_each_entry_safe(skb, next, head, list) { |
|
skb_list_del_init(skb); |
|
pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
|
} |
|
} |
|
|
|
static void __netif_receive_skb_list_core(struct list_head *head, bool pfmemalloc) |
|
{ |
|
/* Fast-path assumptions: |
|
* - There is no RX handler. |
|
* - Only one packet_type matches. |
|
* If either of these fails, we will end up doing some per-packet |
|
* processing in-line, then handling the 'last ptype' for the whole |
|
* sublist. This can't cause out-of-order delivery to any single ptype, |
|
* because the 'last ptype' must be constant across the sublist, and all |
|
* other ptypes are handled per-packet. |
|
*/ |
|
/* Current (common) ptype of sublist */ |
|
struct packet_type *pt_curr = NULL; |
|
/* Current (common) orig_dev of sublist */ |
|
struct net_device *od_curr = NULL; |
|
struct list_head sublist; |
|
struct sk_buff *skb, *next; |
|
|
|
INIT_LIST_HEAD(&sublist); |
|
list_for_each_entry_safe(skb, next, head, list) { |
|
struct net_device *orig_dev = skb->dev; |
|
struct packet_type *pt_prev = NULL; |
|
|
|
skb_list_del_init(skb); |
|
__netif_receive_skb_core(&skb, pfmemalloc, &pt_prev); |
|
if (!pt_prev) |
|
continue; |
|
if (pt_curr != pt_prev || od_curr != orig_dev) { |
|
/* dispatch old sublist */ |
|
__netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr); |
|
/* start new sublist */ |
|
INIT_LIST_HEAD(&sublist); |
|
pt_curr = pt_prev; |
|
od_curr = orig_dev; |
|
} |
|
list_add_tail(&skb->list, &sublist); |
|
} |
|
|
|
/* dispatch final sublist */ |
|
__netif_receive_skb_list_ptype(&sublist, pt_curr, od_curr); |
|
} |
|
|
|
static int __netif_receive_skb(struct sk_buff *skb) |
|
{ |
|
int ret; |
|
|
|
if (sk_memalloc_socks() && skb_pfmemalloc(skb)) { |
|
unsigned int noreclaim_flag; |
|
|
|
/* |
|
* PFMEMALLOC skbs are special, they should |
|
* - be delivered to SOCK_MEMALLOC sockets only |
|
* - stay away from userspace |
|
* - have bounded memory usage |
|
* |
|
* Use PF_MEMALLOC as this saves us from propagating the allocation |
|
* context down to all allocation sites. |
|
*/ |
|
noreclaim_flag = memalloc_noreclaim_save(); |
|
ret = __netif_receive_skb_one_core(skb, true); |
|
memalloc_noreclaim_restore(noreclaim_flag); |
|
} else |
|
ret = __netif_receive_skb_one_core(skb, false); |
|
|
|
return ret; |
|
} |
|
|
|
static void __netif_receive_skb_list(struct list_head *head) |
|
{ |
|
unsigned long noreclaim_flag = 0; |
|
struct sk_buff *skb, *next; |
|
bool pfmemalloc = false; /* Is current sublist PF_MEMALLOC? */ |
|
|
|
list_for_each_entry_safe(skb, next, head, list) { |
|
if ((sk_memalloc_socks() && skb_pfmemalloc(skb)) != pfmemalloc) { |
|
struct list_head sublist; |
|
|
|
/* Handle the previous sublist */ |
|
list_cut_before(&sublist, head, &skb->list); |
|
if (!list_empty(&sublist)) |
|
__netif_receive_skb_list_core(&sublist, pfmemalloc); |
|
pfmemalloc = !pfmemalloc; |
|
/* See comments in __netif_receive_skb */ |
|
if (pfmemalloc) |
|
noreclaim_flag = memalloc_noreclaim_save(); |
|
else |
|
memalloc_noreclaim_restore(noreclaim_flag); |
|
} |
|
} |
|
/* Handle the remaining sublist */ |
|
if (!list_empty(head)) |
|
__netif_receive_skb_list_core(head, pfmemalloc); |
|
/* Restore pflags */ |
|
if (pfmemalloc) |
|
memalloc_noreclaim_restore(noreclaim_flag); |
|
} |
|
|
|
static int generic_xdp_install(struct net_device *dev, struct netdev_bpf *xdp) |
|
{ |
|
struct bpf_prog *old = rtnl_dereference(dev->xdp_prog); |
|
struct bpf_prog *new = xdp->prog; |
|
int ret = 0; |
|
|
|
switch (xdp->command) { |
|
case XDP_SETUP_PROG: |
|
rcu_assign_pointer(dev->xdp_prog, new); |
|
if (old) |
|
bpf_prog_put(old); |
|
|
|
if (old && !new) { |
|
static_branch_dec(&generic_xdp_needed_key); |
|
} else if (new && !old) { |
|
static_branch_inc(&generic_xdp_needed_key); |
|
dev_disable_lro(dev); |
|
dev_disable_gro_hw(dev); |
|
} |
|
break; |
|
|
|
default: |
|
ret = -EINVAL; |
|
break; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static int netif_receive_skb_internal(struct sk_buff *skb) |
|
{ |
|
int ret; |
|
|
|
net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb); |
|
|
|
if (skb_defer_rx_timestamp(skb)) |
|
return NET_RX_SUCCESS; |
|
|
|
rcu_read_lock(); |
|
#ifdef CONFIG_RPS |
|
if (static_branch_unlikely(&rps_needed)) { |
|
struct rps_dev_flow voidflow, *rflow = &voidflow; |
|
int cpu = get_rps_cpu(skb->dev, skb, &rflow); |
|
|
|
if (cpu >= 0) { |
|
ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
|
rcu_read_unlock(); |
|
return ret; |
|
} |
|
} |
|
#endif |
|
ret = __netif_receive_skb(skb); |
|
rcu_read_unlock(); |
|
return ret; |
|
} |
|
|
|
void netif_receive_skb_list_internal(struct list_head *head) |
|
{ |
|
struct sk_buff *skb, *next; |
|
struct list_head sublist; |
|
|
|
INIT_LIST_HEAD(&sublist); |
|
list_for_each_entry_safe(skb, next, head, list) { |
|
net_timestamp_check(READ_ONCE(netdev_tstamp_prequeue), skb); |
|
skb_list_del_init(skb); |
|
if (!skb_defer_rx_timestamp(skb)) |
|
list_add_tail(&skb->list, &sublist); |
|
} |
|
list_splice_init(&sublist, head); |
|
|
|
rcu_read_lock(); |
|
#ifdef CONFIG_RPS |
|
if (static_branch_unlikely(&rps_needed)) { |
|
list_for_each_entry_safe(skb, next, head, list) { |
|
struct rps_dev_flow voidflow, *rflow = &voidflow; |
|
int cpu = get_rps_cpu(skb->dev, skb, &rflow); |
|
|
|
if (cpu >= 0) { |
|
/* Will be handled, remove from list */ |
|
skb_list_del_init(skb); |
|
enqueue_to_backlog(skb, cpu, &rflow->last_qtail); |
|
} |
|
} |
|
} |
|
#endif |
|
__netif_receive_skb_list(head); |
|
rcu_read_unlock(); |
|
} |
|
|
|
/** |
|
* netif_receive_skb - process receive buffer from network |
|
* @skb: buffer to process |
|
* |
|
* netif_receive_skb() is the main receive data processing function. |
|
* It always succeeds. The buffer may be dropped during processing |
|
* for congestion control or by the protocol layers. |
|
* |
|
* This function may only be called from softirq context and interrupts |
|
* should be enabled. |
|
* |
|
* Return values (usually ignored): |
|
* NET_RX_SUCCESS: no congestion |
|
* NET_RX_DROP: packet was dropped |
|
*/ |
|
int netif_receive_skb(struct sk_buff *skb) |
|
{ |
|
int ret; |
|
|
|
trace_netif_receive_skb_entry(skb); |
|
|
|
ret = netif_receive_skb_internal(skb); |
|
trace_netif_receive_skb_exit(ret); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL(netif_receive_skb); |
|
|
|
/** |
|
* netif_receive_skb_list - process many receive buffers from network |
|
* @head: list of skbs to process. |
|
* |
|
* Since return value of netif_receive_skb() is normally ignored, and |
|
* wouldn't be meaningful for a list, this function returns void. |
|
* |
|
* This function may only be called from softirq context and interrupts |
|
* should be enabled. |
|
*/ |
|
void netif_receive_skb_list(struct list_head *head) |
|
{ |
|
struct sk_buff *skb; |
|
|
|
if (list_empty(head)) |
|
return; |
|
if (trace_netif_receive_skb_list_entry_enabled()) { |
|
list_for_each_entry(skb, head, list) |
|
trace_netif_receive_skb_list_entry(skb); |
|
} |
|
netif_receive_skb_list_internal(head); |
|
trace_netif_receive_skb_list_exit(0); |
|
} |
|
EXPORT_SYMBOL(netif_receive_skb_list); |
|
|
|
static DEFINE_PER_CPU(struct work_struct, flush_works); |
|
|
|
/* Network device is going away, flush any packets still pending */ |
|
static void flush_backlog(struct work_struct *work) |
|
{ |
|
struct sk_buff *skb, *tmp; |
|
struct softnet_data *sd; |
|
|
|
local_bh_disable(); |
|
sd = this_cpu_ptr(&softnet_data); |
|
|
|
rps_lock_irq_disable(sd); |
|
skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
|
if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
|
__skb_unlink(skb, &sd->input_pkt_queue); |
|
dev_kfree_skb_irq(skb); |
|
input_queue_head_incr(sd); |
|
} |
|
} |
|
rps_unlock_irq_enable(sd); |
|
|
|
skb_queue_walk_safe(&sd->process_queue, skb, tmp) { |
|
if (skb->dev->reg_state == NETREG_UNREGISTERING) { |
|
__skb_unlink(skb, &sd->process_queue); |
|
kfree_skb(skb); |
|
input_queue_head_incr(sd); |
|
} |
|
} |
|
local_bh_enable(); |
|
} |
|
|
|
static bool flush_required(int cpu) |
|
{ |
|
#if IS_ENABLED(CONFIG_RPS) |
|
struct softnet_data *sd = &per_cpu(softnet_data, cpu); |
|
bool do_flush; |
|
|
|
rps_lock_irq_disable(sd); |
|
|
|
/* as insertion into process_queue happens with the rps lock held, |
|
* process_queue access may race only with dequeue |
|
*/ |
|
do_flush = !skb_queue_empty(&sd->input_pkt_queue) || |
|
!skb_queue_empty_lockless(&sd->process_queue); |
|
rps_unlock_irq_enable(sd); |
|
|
|
return do_flush; |
|
#endif |
|
/* without RPS we can't safely check input_pkt_queue: during a |
|
* concurrent remote skb_queue_splice() we can detect as empty both |
|
* input_pkt_queue and process_queue even if the latter could end-up |
|
* containing a lot of packets. |
|
*/ |
|
return true; |
|
} |
|
|
|
static void flush_all_backlogs(void) |
|
{ |
|
static cpumask_t flush_cpus; |
|
unsigned int cpu; |
|
|
|
/* since we are under rtnl lock protection we can use static data |
|
* for the cpumask and avoid allocating on stack the possibly |
|
* large mask |
|
*/ |
|
ASSERT_RTNL(); |
|
|
|
cpus_read_lock(); |
|
|
|
cpumask_clear(&flush_cpus); |
|
for_each_online_cpu(cpu) { |
|
if (flush_required(cpu)) { |
|
queue_work_on(cpu, system_highpri_wq, |
|
per_cpu_ptr(&flush_works, cpu)); |
|
cpumask_set_cpu(cpu, &flush_cpus); |
|
} |
|
} |
|
|
|
/* we can have in flight packet[s] on the cpus we are not flushing, |
|
* synchronize_net() in unregister_netdevice_many() will take care of |
|
* them |
|
*/ |
|
for_each_cpu(cpu, &flush_cpus) |
|
flush_work(per_cpu_ptr(&flush_works, cpu)); |
|
|
|
cpus_read_unlock(); |
|
} |
|
|
|
static void net_rps_send_ipi(struct softnet_data *remsd) |
|
{ |
|
#ifdef CONFIG_RPS |
|
while (remsd) { |
|
struct softnet_data *next = remsd->rps_ipi_next; |
|
|
|
if (cpu_online(remsd->cpu)) |
|
smp_call_function_single_async(remsd->cpu, &remsd->csd); |
|
remsd = next; |
|
} |
|
#endif |
|
} |
|
|
|
/* |
|
* net_rps_action_and_irq_enable sends any pending IPI's for rps. |
|
* Note: called with local irq disabled, but exits with local irq enabled. |
|
*/ |
|
static void net_rps_action_and_irq_enable(struct softnet_data *sd) |
|
{ |
|
#ifdef CONFIG_RPS |
|
struct softnet_data *remsd = sd->rps_ipi_list; |
|
|
|
if (remsd) { |
|
sd->rps_ipi_list = NULL; |
|
|
|
local_irq_enable(); |
|
|
|
/* Send pending IPI's to kick RPS processing on remote cpus. */ |
|
net_rps_send_ipi(remsd); |
|
} else |
|
#endif |
|
local_irq_enable(); |
|
} |
|
|
|
static bool sd_has_rps_ipi_waiting(struct softnet_data *sd) |
|
{ |
|
#ifdef CONFIG_RPS |
|
return sd->rps_ipi_list != NULL; |
|
#else |
|
return false; |
|
#endif |
|
} |
|
|
|
static int process_backlog(struct napi_struct *napi, int quota) |
|
{ |
|
struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
|
bool again = true; |
|
int work = 0; |
|
|
|
/* Check if we have pending ipi, its better to send them now, |
|
* not waiting net_rx_action() end. |
|
*/ |
|
if (sd_has_rps_ipi_waiting(sd)) { |
|
local_irq_disable(); |
|
net_rps_action_and_irq_enable(sd); |
|
} |
|
|
|
napi->weight = READ_ONCE(dev_rx_weight); |
|
while (again) { |
|
struct sk_buff *skb; |
|
|
|
while ((skb = __skb_dequeue(&sd->process_queue))) { |
|
rcu_read_lock(); |
|
__netif_receive_skb(skb); |
|
rcu_read_unlock(); |
|
input_queue_head_incr(sd); |
|
if (++work >= quota) |
|
return work; |
|
|
|
} |
|
|
|
rps_lock_irq_disable(sd); |
|
if (skb_queue_empty(&sd->input_pkt_queue)) { |
|
/* |
|
* Inline a custom version of __napi_complete(). |
|
* only current cpu owns and manipulates this napi, |
|
* and NAPI_STATE_SCHED is the only possible flag set |
|
* on backlog. |
|
* We can use a plain write instead of clear_bit(), |
|
* and we dont need an smp_mb() memory barrier. |
|
*/ |
|
napi->state = 0; |
|
again = false; |
|
} else { |
|
skb_queue_splice_tail_init(&sd->input_pkt_queue, |
|
&sd->process_queue); |
|
} |
|
rps_unlock_irq_enable(sd); |
|
} |
|
|
|
return work; |
|
} |
|
|
|
/** |
|
* __napi_schedule - schedule for receive |
|
* @n: entry to schedule |
|
* |
|
* The entry's receive function will be scheduled to run. |
|
* Consider using __napi_schedule_irqoff() if hard irqs are masked. |
|
*/ |
|
void __napi_schedule(struct napi_struct *n) |
|
{ |
|
unsigned long flags; |
|
|
|
local_irq_save(flags); |
|
____napi_schedule(this_cpu_ptr(&softnet_data), n); |
|
local_irq_restore(flags); |
|
} |
|
EXPORT_SYMBOL(__napi_schedule); |
|
|
|
/** |
|
* napi_schedule_prep - check if napi can be scheduled |
|
* @n: napi context |
|
* |
|
* Test if NAPI routine is already running, and if not mark |
|
* it as running. This is used as a condition variable to |
|
* insure only one NAPI poll instance runs. We also make |
|
* sure there is no pending NAPI disable. |
|
*/ |
|
bool napi_schedule_prep(struct napi_struct *n) |
|
{ |
|
unsigned long val, new; |
|
|
|
do { |
|
val = READ_ONCE(n->state); |
|
if (unlikely(val & NAPIF_STATE_DISABLE)) |
|
return false; |
|
new = val | NAPIF_STATE_SCHED; |
|
|
|
/* Sets STATE_MISSED bit if STATE_SCHED was already set |
|
* This was suggested by Alexander Duyck, as compiler |
|
* emits better code than : |
|
* if (val & NAPIF_STATE_SCHED) |
|
* new |= NAPIF_STATE_MISSED; |
|
*/ |
|
new |= (val & NAPIF_STATE_SCHED) / NAPIF_STATE_SCHED * |
|
NAPIF_STATE_MISSED; |
|
} while (cmpxchg(&n->state, val, new) != val); |
|
|
|
return !(val & NAPIF_STATE_SCHED); |
|
} |
|
EXPORT_SYMBOL(napi_schedule_prep); |
|
|
|
/** |
|
* __napi_schedule_irqoff - schedule for receive |
|
* @n: entry to schedule |
|
* |
|
* Variant of __napi_schedule() assuming hard irqs are masked. |
|
* |
|
* On PREEMPT_RT enabled kernels this maps to __napi_schedule() |
|
* because the interrupt disabled assumption might not be true |
|
* due to force-threaded interrupts and spinlock substitution. |
|
*/ |
|
void __napi_schedule_irqoff(struct napi_struct *n) |
|
{ |
|
if (!IS_ENABLED(CONFIG_PREEMPT_RT)) |
|
____napi_schedule(this_cpu_ptr(&softnet_data), n); |
|
else |
|
__napi_schedule(n); |
|
} |
|
EXPORT_SYMBOL(__napi_schedule_irqoff); |
|
|
|
bool napi_complete_done(struct napi_struct *n, int work_done) |
|
{ |
|
unsigned long flags, val, new, timeout = 0; |
|
bool ret = true; |
|
|
|
/* |
|
* 1) Don't let napi dequeue from the cpu poll list |
|
* just in case its running on a different cpu. |
|
* 2) If we are busy polling, do nothing here, we have |
|
* the guarantee we will be called later. |
|
*/ |
|
if (unlikely(n->state & (NAPIF_STATE_NPSVC | |
|
NAPIF_STATE_IN_BUSY_POLL))) |
|
return false; |
|
|
|
if (work_done) { |
|
if (n->gro_bitmask) |
|
timeout = READ_ONCE(n->dev->gro_flush_timeout); |
|
n->defer_hard_irqs_count = READ_ONCE(n->dev->napi_defer_hard_irqs); |
|
} |
|
if (n->defer_hard_irqs_count > 0) { |
|
n->defer_hard_irqs_count--; |
|
timeout = READ_ONCE(n->dev->gro_flush_timeout); |
|
if (timeout) |
|
ret = false; |
|
} |
|
if (n->gro_bitmask) { |
|
/* When the NAPI instance uses a timeout and keeps postponing |
|
* it, we need to bound somehow the time packets are kept in |
|
* the GRO layer |
|
*/ |
|
napi_gro_flush(n, !!timeout); |
|
} |
|
|
|
gro_normal_list(n); |
|
|
|
if (unlikely(!list_empty(&n->poll_list))) { |
|
/* If n->poll_list is not empty, we need to mask irqs */ |
|
local_irq_save(flags); |
|
list_del_init(&n->poll_list); |
|
local_irq_restore(flags); |
|
} |
|
|
|
do { |
|
val = READ_ONCE(n->state); |
|
|
|
WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED)); |
|
|
|
new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED | |
|
NAPIF_STATE_SCHED_THREADED | |
|
NAPIF_STATE_PREFER_BUSY_POLL); |
|
|
|
/* If STATE_MISSED was set, leave STATE_SCHED set, |
|
* because we will call napi->poll() one more time. |
|
* This C code was suggested by Alexander Duyck to help gcc. |
|
*/ |
|
new |= (val & NAPIF_STATE_MISSED) / NAPIF_STATE_MISSED * |
|
NAPIF_STATE_SCHED; |
|
} while (cmpxchg(&n->state, val, new) != val); |
|
|
|
if (unlikely(val & NAPIF_STATE_MISSED)) { |
|
__napi_schedule(n); |
|
return false; |
|
} |
|
|
|
if (timeout) |
|
hrtimer_start(&n->timer, ns_to_ktime(timeout), |
|
HRTIMER_MODE_REL_PINNED); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(napi_complete_done); |
|
|
|
/* must be called under rcu_read_lock(), as we dont take a reference */ |
|
static struct napi_struct *napi_by_id(unsigned int napi_id) |
|
{ |
|
unsigned int hash = napi_id % HASH_SIZE(napi_hash); |
|
struct napi_struct *napi; |
|
|
|
hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node) |
|
if (napi->napi_id == napi_id) |
|
return napi; |
|
|
|
return NULL; |
|
} |
|
|
|
#if defined(CONFIG_NET_RX_BUSY_POLL) |
|
|
|
static void __busy_poll_stop(struct napi_struct *napi, bool skip_schedule) |
|
{ |
|
if (!skip_schedule) { |
|
gro_normal_list(napi); |
|
__napi_schedule(napi); |
|
return; |
|
} |
|
|
|
if (napi->gro_bitmask) { |
|
/* flush too old packets |
|
* If HZ < 1000, flush all packets. |
|
*/ |
|
napi_gro_flush(napi, HZ >= 1000); |
|
} |
|
|
|
gro_normal_list(napi); |
|
clear_bit(NAPI_STATE_SCHED, &napi->state); |
|
} |
|
|
|
static void busy_poll_stop(struct napi_struct *napi, void *have_poll_lock, bool prefer_busy_poll, |
|
u16 budget) |
|
{ |
|
bool skip_schedule = false; |
|
unsigned long timeout; |
|
int rc; |
|
|
|
/* Busy polling means there is a high chance device driver hard irq |
|
* could not grab NAPI_STATE_SCHED, and that NAPI_STATE_MISSED was |
|
* set in napi_schedule_prep(). |
|
* Since we are about to call napi->poll() once more, we can safely |
|
* clear NAPI_STATE_MISSED. |
|
* |
|
* Note: x86 could use a single "lock and ..." instruction |
|
* to perform these two clear_bit() |
|
*/ |
|
clear_bit(NAPI_STATE_MISSED, &napi->state); |
|
clear_bit(NAPI_STATE_IN_BUSY_POLL, &napi->state); |
|
|
|
local_bh_disable(); |
|
|
|
if (prefer_busy_poll) { |
|
napi->defer_hard_irqs_count = READ_ONCE(napi->dev->napi_defer_hard_irqs); |
|
timeout = READ_ONCE(napi->dev->gro_flush_timeout); |
|
if (napi->defer_hard_irqs_count && timeout) { |
|
hrtimer_start(&napi->timer, ns_to_ktime(timeout), HRTIMER_MODE_REL_PINNED); |
|
skip_schedule = true; |
|
} |
|
} |
|
|
|
/* All we really want here is to re-enable device interrupts. |
|
* Ideally, a new ndo_busy_poll_stop() could avoid another round. |
|
*/ |
|
rc = napi->poll(napi, budget); |
|
/* We can't gro_normal_list() here, because napi->poll() might have |
|
* rearmed the napi (napi_complete_done()) in which case it could |
|
* already be running on another CPU. |
|
*/ |
|
trace_napi_poll(napi, rc, budget); |
|
netpoll_poll_unlock(have_poll_lock); |
|
if (rc == budget) |
|
__busy_poll_stop(napi, skip_schedule); |
|
local_bh_enable(); |
|
} |
|
|
|
void napi_busy_loop(unsigned int napi_id, |
|
bool (*loop_end)(void *, unsigned long), |
|
void *loop_end_arg, bool prefer_busy_poll, u16 budget) |
|
{ |
|
unsigned long start_time = loop_end ? busy_loop_current_time() : 0; |
|
int (*napi_poll)(struct napi_struct *napi, int budget); |
|
void *have_poll_lock = NULL; |
|
struct napi_struct *napi; |
|
|
|
restart: |
|
napi_poll = NULL; |
|
|
|
rcu_read_lock(); |
|
|
|
napi = napi_by_id(napi_id); |
|
if (!napi) |
|
goto out; |
|
|
|
preempt_disable(); |
|
for (;;) { |
|
int work = 0; |
|
|
|
local_bh_disable(); |
|
if (!napi_poll) { |
|
unsigned long val = READ_ONCE(napi->state); |
|
|
|
/* If multiple threads are competing for this napi, |
|
* we avoid dirtying napi->state as much as we can. |
|
*/ |
|
if (val & (NAPIF_STATE_DISABLE | NAPIF_STATE_SCHED | |
|
NAPIF_STATE_IN_BUSY_POLL)) { |
|
if (prefer_busy_poll) |
|
set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); |
|
goto count; |
|
} |
|
if (cmpxchg(&napi->state, val, |
|
val | NAPIF_STATE_IN_BUSY_POLL | |
|
NAPIF_STATE_SCHED) != val) { |
|
if (prefer_busy_poll) |
|
set_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); |
|
goto count; |
|
} |
|
have_poll_lock = netpoll_poll_lock(napi); |
|
napi_poll = napi->poll; |
|
} |
|
work = napi_poll(napi, budget); |
|
trace_napi_poll(napi, work, budget); |
|
gro_normal_list(napi); |
|
count: |
|
if (work > 0) |
|
__NET_ADD_STATS(dev_net(napi->dev), |
|
LINUX_MIB_BUSYPOLLRXPACKETS, work); |
|
local_bh_enable(); |
|
|
|
if (!loop_end || loop_end(loop_end_arg, start_time)) |
|
break; |
|
|
|
if (unlikely(need_resched())) { |
|
if (napi_poll) |
|
busy_poll_stop(napi, have_poll_lock, prefer_busy_poll, budget); |
|
preempt_enable(); |
|
rcu_read_unlock(); |
|
cond_resched(); |
|
if (loop_end(loop_end_arg, start_time)) |
|
return; |
|
goto restart; |
|
} |
|
cpu_relax(); |
|
} |
|
if (napi_poll) |
|
busy_poll_stop(napi, have_poll_lock, prefer_busy_poll, budget); |
|
preempt_enable(); |
|
out: |
|
rcu_read_unlock(); |
|
} |
|
EXPORT_SYMBOL(napi_busy_loop); |
|
|
|
#endif /* CONFIG_NET_RX_BUSY_POLL */ |
|
|
|
static void napi_hash_add(struct napi_struct *napi) |
|
{ |
|
if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state)) |
|
return; |
|
|
|
spin_lock(&napi_hash_lock); |
|
|
|
/* 0..NR_CPUS range is reserved for sender_cpu use */ |
|
do { |
|
if (unlikely(++napi_gen_id < MIN_NAPI_ID)) |
|
napi_gen_id = MIN_NAPI_ID; |
|
} while (napi_by_id(napi_gen_id)); |
|
napi->napi_id = napi_gen_id; |
|
|
|
hlist_add_head_rcu(&napi->napi_hash_node, |
|
&napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]); |
|
|
|
spin_unlock(&napi_hash_lock); |
|
} |
|
|
|
/* Warning : caller is responsible to make sure rcu grace period |
|
* is respected before freeing memory containing @napi |
|
*/ |
|
static void napi_hash_del(struct napi_struct *napi) |
|
{ |
|
spin_lock(&napi_hash_lock); |
|
|
|
hlist_del_init_rcu(&napi->napi_hash_node); |
|
|
|
spin_unlock(&napi_hash_lock); |
|
} |
|
|
|
static enum hrtimer_restart napi_watchdog(struct hrtimer *timer) |
|
{ |
|
struct napi_struct *napi; |
|
|
|
napi = container_of(timer, struct napi_struct, timer); |
|
|
|
/* Note : we use a relaxed variant of napi_schedule_prep() not setting |
|
* NAPI_STATE_MISSED, since we do not react to a device IRQ. |
|
*/ |
|
if (!napi_disable_pending(napi) && |
|
!test_and_set_bit(NAPI_STATE_SCHED, &napi->state)) { |
|
clear_bit(NAPI_STATE_PREFER_BUSY_POLL, &napi->state); |
|
__napi_schedule_irqoff(napi); |
|
} |
|
|
|
return HRTIMER_NORESTART; |
|
} |
|
|
|
static void init_gro_hash(struct napi_struct *napi) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < GRO_HASH_BUCKETS; i++) { |
|
INIT_LIST_HEAD(&napi->gro_hash[i].list); |
|
napi->gro_hash[i].count = 0; |
|
} |
|
napi->gro_bitmask = 0; |
|
} |
|
|
|
int dev_set_threaded(struct net_device *dev, bool threaded) |
|
{ |
|
struct napi_struct *napi; |
|
int err = 0; |
|
|
|
if (dev->threaded == threaded) |
|
return 0; |
|
|
|
if (threaded) { |
|
list_for_each_entry(napi, &dev->napi_list, dev_list) { |
|
if (!napi->thread) { |
|
err = napi_kthread_create(napi); |
|
if (err) { |
|
threaded = false; |
|
break; |
|
} |
|
} |
|
} |
|
} |
|
|
|
dev->threaded = threaded; |
|
|
|
/* Make sure kthread is created before THREADED bit |
|
* is set. |
|
*/ |
|
smp_mb__before_atomic(); |
|
|
|
/* Setting/unsetting threaded mode on a napi might not immediately |
|
* take effect, if the current napi instance is actively being |
|
* polled. In this case, the switch between threaded mode and |
|
* softirq mode will happen in the next round of napi_schedule(). |
|
* This should not cause hiccups/stalls to the live traffic. |
|
*/ |
|
list_for_each_entry(napi, &dev->napi_list, dev_list) { |
|
if (threaded) |
|
set_bit(NAPI_STATE_THREADED, &napi->state); |
|
else |
|
clear_bit(NAPI_STATE_THREADED, &napi->state); |
|
} |
|
|
|
return err; |
|
} |
|
EXPORT_SYMBOL(dev_set_threaded); |
|
|
|
void netif_napi_add_weight(struct net_device *dev, struct napi_struct *napi, |
|
int (*poll)(struct napi_struct *, int), int weight) |
|
{ |
|
if (WARN_ON(test_and_set_bit(NAPI_STATE_LISTED, &napi->state))) |
|
return; |
|
|
|
INIT_LIST_HEAD(&napi->poll_list); |
|
INIT_HLIST_NODE(&napi->napi_hash_node); |
|
hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED); |
|
napi->timer.function = napi_watchdog; |
|
init_gro_hash(napi); |
|
napi->skb = NULL; |
|
INIT_LIST_HEAD(&napi->rx_list); |
|
napi->rx_count = 0; |
|
napi->poll = poll; |
|
if (weight > NAPI_POLL_WEIGHT) |
|
netdev_err_once(dev, "%s() called with weight %d\n", __func__, |
|
weight); |
|
napi->weight = weight; |
|
napi->dev = dev; |
|
#ifdef CONFIG_NETPOLL |
|
napi->poll_owner = -1; |
|
#endif |
|
set_bit(NAPI_STATE_SCHED, &napi->state); |
|
set_bit(NAPI_STATE_NPSVC, &napi->state); |
|
list_add_rcu(&napi->dev_list, &dev->napi_list); |
|
napi_hash_add(napi); |
|
napi_get_frags_check(napi); |
|
/* Create kthread for this napi if dev->threaded is set. |
|
* Clear dev->threaded if kthread creation failed so that |
|
* threaded mode will not be enabled in napi_enable(). |
|
*/ |
|
if (dev->threaded && napi_kthread_create(napi)) |
|
dev->threaded = 0; |
|
} |
|
EXPORT_SYMBOL(netif_napi_add_weight); |
|
|
|
void napi_disable(struct napi_struct *n) |
|
{ |
|
unsigned long val, new; |
|
|
|
might_sleep(); |
|
set_bit(NAPI_STATE_DISABLE, &n->state); |
|
|
|
for ( ; ; ) { |
|
val = READ_ONCE(n->state); |
|
if (val & (NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC)) { |
|
usleep_range(20, 200); |
|
continue; |
|
} |
|
|
|
new = val | NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC; |
|
new &= ~(NAPIF_STATE_THREADED | NAPIF_STATE_PREFER_BUSY_POLL); |
|
|
|
if (cmpxchg(&n->state, val, new) == val) |
|
break; |
|
} |
|
|
|
hrtimer_cancel(&n->timer); |
|
|
|
clear_bit(NAPI_STATE_DISABLE, &n->state); |
|
} |
|
EXPORT_SYMBOL(napi_disable); |
|
|
|
/** |
|
* napi_enable - enable NAPI scheduling |
|
* @n: NAPI context |
|
* |
|
* Resume NAPI from being scheduled on this context. |
|
* Must be paired with napi_disable. |
|
*/ |
|
void napi_enable(struct napi_struct *n) |
|
{ |
|
unsigned long val, new; |
|
|
|
do { |
|
val = READ_ONCE(n->state); |
|
BUG_ON(!test_bit(NAPI_STATE_SCHED, &val)); |
|
|
|
new = val & ~(NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC); |
|
if (n->dev->threaded && n->thread) |
|
new |= NAPIF_STATE_THREADED; |
|
} while (cmpxchg(&n->state, val, new) != val); |
|
} |
|
EXPORT_SYMBOL(napi_enable); |
|
|
|
static void flush_gro_hash(struct napi_struct *napi) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < GRO_HASH_BUCKETS; i++) { |
|
struct sk_buff *skb, *n; |
|
|
|
list_for_each_entry_safe(skb, n, &napi->gro_hash[i].list, list) |
|
kfree_skb(skb); |
|
napi->gro_hash[i].count = 0; |
|
} |
|
} |
|
|
|
/* Must be called in process context */ |
|
void __netif_napi_del(struct napi_struct *napi) |
|
{ |
|
if (!test_and_clear_bit(NAPI_STATE_LISTED, &napi->state)) |
|
return; |
|
|
|
napi_hash_del(napi); |
|
list_del_rcu(&napi->dev_list); |
|
napi_free_frags(napi); |
|
|
|
flush_gro_hash(napi); |
|
napi->gro_bitmask = 0; |
|
|
|
if (napi->thread) { |
|
kthread_stop(napi->thread); |
|
napi->thread = NULL; |
|
} |
|
} |
|
EXPORT_SYMBOL(__netif_napi_del); |
|
|
|
static int __napi_poll(struct napi_struct *n, bool *repoll) |
|
{ |
|
int work, weight; |
|
|
|
weight = n->weight; |
|
|
|
/* This NAPI_STATE_SCHED test is for avoiding a race |
|
* with netpoll's poll_napi(). Only the entity which |
|
* obtains the lock and sees NAPI_STATE_SCHED set will |
|
* actually make the ->poll() call. Therefore we avoid |
|
* accidentally calling ->poll() when NAPI is not scheduled. |
|
*/ |
|
work = 0; |
|
if (test_bit(NAPI_STATE_SCHED, &n->state)) { |
|
work = n->poll(n, weight); |
|
trace_napi_poll(n, work, weight); |
|
} |
|
|
|
if (unlikely(work > weight)) |
|
netdev_err_once(n->dev, "NAPI poll function %pS returned %d, exceeding its budget of %d.\n", |
|
n->poll, work, weight); |
|
|
|
if (likely(work < weight)) |
|
return work; |
|
|
|
/* Drivers must not modify the NAPI state if they |
|
* consume the entire weight. In such cases this code |
|
* still "owns" the NAPI instance and therefore can |
|
* move the instance around on the list at-will. |
|
*/ |
|
if (unlikely(napi_disable_pending(n))) { |
|
napi_complete(n); |
|
return work; |
|
} |
|
|
|
/* The NAPI context has more processing work, but busy-polling |
|
* is preferred. Exit early. |
|
*/ |
|
if (napi_prefer_busy_poll(n)) { |
|
if (napi_complete_done(n, work)) { |
|
/* If timeout is not set, we need to make sure |
|
* that the NAPI is re-scheduled. |
|
*/ |
|
napi_schedule(n); |
|
} |
|
return work; |
|
} |
|
|
|
if (n->gro_bitmask) { |
|
/* flush too old packets |
|
* If HZ < 1000, flush all packets. |
|
*/ |
|
napi_gro_flush(n, HZ >= 1000); |
|
} |
|
|
|
gro_normal_list(n); |
|
|
|
/* Some drivers may have called napi_schedule |
|
* prior to exhausting their budget. |
|
*/ |
|
if (unlikely(!list_empty(&n->poll_list))) { |
|
pr_warn_once("%s: Budget exhausted after napi rescheduled\n", |
|
n->dev ? n->dev->name : "backlog"); |
|
return work; |
|
} |
|
|
|
*repoll = true; |
|
|
|
return work; |
|
} |
|
|
|
static int napi_poll(struct napi_struct *n, struct list_head *repoll) |
|
{ |
|
bool do_repoll = false; |
|
void *have; |
|
int work; |
|
|
|
list_del_init(&n->poll_list); |
|
|
|
have = netpoll_poll_lock(n); |
|
|
|
work = __napi_poll(n, &do_repoll); |
|
|
|
if (do_repoll) |
|
list_add_tail(&n->poll_list, repoll); |
|
|
|
netpoll_poll_unlock(have); |
|
|
|
return work; |
|
} |
|
|
|
static int napi_thread_wait(struct napi_struct *napi) |
|
{ |
|
bool woken = false; |
|
|
|
set_current_state(TASK_INTERRUPTIBLE); |
|
|
|
while (!kthread_should_stop()) { |
|
/* Testing SCHED_THREADED bit here to make sure the current |
|
* kthread owns this napi and could poll on this napi. |
|
* Testing SCHED bit is not enough because SCHED bit might be |
|
* set by some other busy poll thread or by napi_disable(). |
|
*/ |
|
if (test_bit(NAPI_STATE_SCHED_THREADED, &napi->state) || woken) { |
|
WARN_ON(!list_empty(&napi->poll_list)); |
|
__set_current_state(TASK_RUNNING); |
|
return 0; |
|
} |
|
|
|
schedule(); |
|
/* woken being true indicates this thread owns this napi. */ |
|
woken = true; |
|
set_current_state(TASK_INTERRUPTIBLE); |
|
} |
|
__set_current_state(TASK_RUNNING); |
|
|
|
return -1; |
|
} |
|
|
|
static int napi_threaded_poll(void *data) |
|
{ |
|
struct napi_struct *napi = data; |
|
void *have; |
|
|
|
while (!napi_thread_wait(napi)) { |
|
for (;;) { |
|
bool repoll = false; |
|
|
|
local_bh_disable(); |
|
|
|
have = netpoll_poll_lock(napi); |
|
__napi_poll(napi, &repoll); |
|
netpoll_poll_unlock(have); |
|
|
|
local_bh_enable(); |
|
|
|
if (!repoll) |
|
break; |
|
|
|
cond_resched(); |
|
} |
|
} |
|
return 0; |
|
} |
|
|
|
static void skb_defer_free_flush(struct softnet_data *sd) |
|
{ |
|
struct sk_buff *skb, *next; |
|
unsigned long flags; |
|
|
|
/* Paired with WRITE_ONCE() in skb_attempt_defer_free() */ |
|
if (!READ_ONCE(sd->defer_list)) |
|
return; |
|
|
|
spin_lock_irqsave(&sd->defer_lock, flags); |
|
skb = sd->defer_list; |
|
sd->defer_list = NULL; |
|
sd->defer_count = 0; |
|
spin_unlock_irqrestore(&sd->defer_lock, flags); |
|
|
|
while (skb != NULL) { |
|
next = skb->next; |
|
napi_consume_skb(skb, 1); |
|
skb = next; |
|
} |
|
} |
|
|
|
static __latent_entropy void net_rx_action(struct softirq_action *h) |
|
{ |
|
struct softnet_data *sd = this_cpu_ptr(&softnet_data); |
|
unsigned long time_limit = jiffies + |
|
usecs_to_jiffies(READ_ONCE(netdev_budget_usecs)); |
|
int budget = READ_ONCE(netdev_budget); |
|
LIST_HEAD(list); |
|
LIST_HEAD(repoll); |
|
|
|
local_irq_disable(); |
|
list_splice_init(&sd->poll_list, &list); |
|
local_irq_enable(); |
|
|
|
for (;;) { |
|
struct napi_struct *n; |
|
|
|
skb_defer_free_flush(sd); |
|
|
|
if (list_empty(&list)) { |
|
if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll)) |
|
goto end; |
|
break; |
|
} |
|
|
|
n = list_first_entry(&list, struct napi_struct, poll_list); |
|
budget -= napi_poll(n, &repoll); |
|
|
|
/* If softirq window is exhausted then punt. |
|
* Allow this to run for 2 jiffies since which will allow |
|
* an average latency of 1.5/HZ. |
|
*/ |
|
if (unlikely(budget <= 0 || |
|
time_after_eq(jiffies, time_limit))) { |
|
sd->time_squeeze++; |
|
break; |
|
} |
|
} |
|
|
|
local_irq_disable(); |
|
|
|
list_splice_tail_init(&sd->poll_list, &list); |
|
list_splice_tail(&repoll, &list); |
|
list_splice(&list, &sd->poll_list); |
|
if (!list_empty(&sd->poll_list)) |
|
__raise_softirq_irqoff(NET_RX_SOFTIRQ); |
|
|
|
net_rps_action_and_irq_enable(sd); |
|
end:; |
|
} |
|
|
|
struct netdev_adjacent { |
|
struct net_device *dev; |
|
netdevice_tracker dev_tracker; |
|
|
|
/* upper master flag, there can only be one master device per list */ |
|
bool master; |
|
|
|
/* lookup ignore flag */ |
|
bool ignore; |
|
|
|
/* counter for the number of times this device was added to us */ |
|
u16 ref_nr; |
|
|
|
/* private field for the users */ |
|
void *private; |
|
|
|
struct list_head list; |
|
struct rcu_head rcu; |
|
}; |
|
|
|
static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev, |
|
struct list_head *adj_list) |
|
{ |
|
struct netdev_adjacent *adj; |
|
|
|
list_for_each_entry(adj, adj_list, list) { |
|
if (adj->dev == adj_dev) |
|
return adj; |
|
} |
|
return NULL; |
|
} |
|
|
|
static int ____netdev_has_upper_dev(struct net_device *upper_dev, |
|
struct netdev_nested_priv *priv) |
|
{ |
|
struct net_device *dev = (struct net_device *)priv->data; |
|
|
|
return upper_dev == dev; |
|
} |
|
|
|
/** |
|
* netdev_has_upper_dev - Check if device is linked to an upper device |
|
* @dev: device |
|
* @upper_dev: upper device to check |
|
* |
|
* Find out if a device is linked to specified upper device and return true |
|
* in case it is. Note that this checks only immediate upper device, |
|
* not through a complete stack of devices. The caller must hold the RTNL lock. |
|
*/ |
|
bool netdev_has_upper_dev(struct net_device *dev, |
|
struct net_device *upper_dev) |
|
{ |
|
struct netdev_nested_priv priv = { |
|
.data = (void *)upper_dev, |
|
}; |
|
|
|
ASSERT_RTNL(); |
|
|
|
return netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev, |
|
&priv); |
|
} |
|
EXPORT_SYMBOL(netdev_has_upper_dev); |
|
|
|
/** |
|
* netdev_has_upper_dev_all_rcu - Check if device is linked to an upper device |
|
* @dev: device |
|
* @upper_dev: upper device to check |
|
* |
|
* Find out if a device is linked to specified upper device and return true |
|
* in case it is. Note that this checks the entire upper device chain. |
|
* The caller must hold rcu lock. |
|
*/ |
|
|
|
bool netdev_has_upper_dev_all_rcu(struct net_device *dev, |
|
struct net_device *upper_dev) |
|
{ |
|
struct netdev_nested_priv priv = { |
|
.data = (void *)upper_dev, |
|
}; |
|
|
|
return !!netdev_walk_all_upper_dev_rcu(dev, ____netdev_has_upper_dev, |
|
&priv); |
|
} |
|
EXPORT_SYMBOL(netdev_has_upper_dev_all_rcu); |
|
|
|
/** |
|
* netdev_has_any_upper_dev - Check if device is linked to some device |
|
* @dev: device |
|
* |
|
* Find out if a device is linked to an upper device and return true in case |
|
* it is. The caller must hold the RTNL lock. |
|
*/ |
|
bool netdev_has_any_upper_dev(struct net_device *dev) |
|
{ |
|
ASSERT_RTNL(); |
|
|
|
return !list_empty(&dev->adj_list.upper); |
|
} |
|
EXPORT_SYMBOL(netdev_has_any_upper_dev); |
|
|
|
/** |
|
* netdev_master_upper_dev_get - Get master upper device |
|
* @dev: device |
|
* |
|
* Find a master upper device and return pointer to it or NULL in case |
|
* it's not there. The caller must hold the RTNL lock. |
|
*/ |
|
struct net_device *netdev_master_upper_dev_get(struct net_device *dev) |
|
{ |
|
struct netdev_adjacent *upper; |
|
|
|
ASSERT_RTNL(); |
|
|
|
if (list_empty(&dev->adj_list.upper)) |
|
return NULL; |
|
|
|
upper = list_first_entry(&dev->adj_list.upper, |
|
struct netdev_adjacent, list); |
|
if (likely(upper->master)) |
|
return upper->dev; |
|
return NULL; |
|
} |
|
EXPORT_SYMBOL(netdev_master_upper_dev_get); |
|
|
|
static struct net_device *__netdev_master_upper_dev_get(struct net_device *dev) |
|
{ |
|
struct netdev_adjacent *upper; |
|
|
|
ASSERT_RTNL(); |
|
|
|
if (list_empty(&dev->adj_list.upper)) |
|
return NULL; |
|
|
|
upper = list_first_entry(&dev->adj_list.upper, |
|
struct netdev_adjacent, list); |
|
if (likely(upper->master) && !upper->ignore) |
|
return upper->dev; |
|
return NULL; |
|
} |
|
|
|
/** |
|
* netdev_has_any_lower_dev - Check if device is linked to some device |
|
* @dev: device |
|
* |
|
* Find out if a device is linked to a lower device and return true in case |
|
* it is. The caller must hold the RTNL lock. |
|
*/ |
|
static bool netdev_has_any_lower_dev(struct net_device *dev) |
|
{ |
|
ASSERT_RTNL(); |
|
|
|
return !list_empty(&dev->adj_list.lower); |
|
} |
|
|
|
void *netdev_adjacent_get_private(struct list_head *adj_list) |
|
{ |
|
struct netdev_adjacent *adj; |
|
|
|
adj = list_entry(adj_list, struct netdev_adjacent, list); |
|
|
|
return adj->private; |
|
} |
|
EXPORT_SYMBOL(netdev_adjacent_get_private); |
|
|
|
/** |
|
* netdev_upper_get_next_dev_rcu - Get the next dev from upper list |
|
* @dev: device |
|
* @iter: list_head ** of the current position |
|
* |
|
* Gets the next device from the dev's upper list, starting from iter |
|
* position. The caller must hold RCU read lock. |
|
*/ |
|
struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev, |
|
struct list_head **iter) |
|
{ |
|
struct netdev_adjacent *upper; |
|
|
|
WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); |
|
|
|
upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); |
|
|
|
if (&upper->list == &dev->adj_list.upper) |
|
return NULL; |
|
|
|
*iter = &upper->list; |
|
|
|
return upper->dev; |
|
} |
|
EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu); |
|
|
|
static struct net_device *__netdev_next_upper_dev(struct net_device *dev, |
|
struct list_head **iter, |
|
bool *ignore) |
|
{ |
|
struct netdev_adjacent *upper; |
|
|
|
upper = list_entry((*iter)->next, struct netdev_adjacent, list); |
|
|
|
if (&upper->list == &dev->adj_list.upper) |
|
return NULL; |
|
|
|
*iter = &upper->list; |
|
*ignore = upper->ignore; |
|
|
|
return upper->dev; |
|
} |
|
|
|
static struct net_device *netdev_next_upper_dev_rcu(struct net_device *dev, |
|
struct list_head **iter) |
|
{ |
|
struct netdev_adjacent *upper; |
|
|
|
WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held()); |
|
|
|
upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); |
|
|
|
if (&upper->list == &dev->adj_list.upper) |
|
return NULL; |
|
|
|
*iter = &upper->list; |
|
|
|
return upper->dev; |
|
} |
|
|
|
static int __netdev_walk_all_upper_dev(struct net_device *dev, |
|
int (*fn)(struct net_device *dev, |
|
struct netdev_nested_priv *priv), |
|
struct netdev_nested_priv *priv) |
|
{ |
|
struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; |
|
struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; |
|
int ret, cur = 0; |
|
bool ignore; |
|
|
|
now = dev; |
|
iter = &dev->adj_list.upper; |
|
|
|
while (1) { |
|
if (now != dev) { |
|
ret = fn(now, priv); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
next = NULL; |
|
while (1) { |
|
udev = __netdev_next_upper_dev(now, &iter, &ignore); |
|
if (!udev) |
|
break; |
|
if (ignore) |
|
continue; |
|
|
|
next = udev; |
|
niter = &udev->adj_list.upper; |
|
dev_stack[cur] = now; |
|
iter_stack[cur++] = iter; |
|
break; |
|
} |
|
|
|
if (!next) { |
|
if (!cur) |
|
return 0; |
|
next = dev_stack[--cur]; |
|
niter = iter_stack[cur]; |
|
} |
|
|
|
now = next; |
|
iter = niter; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
int netdev_walk_all_upper_dev_rcu(struct net_device *dev, |
|
int (*fn)(struct net_device *dev, |
|
struct netdev_nested_priv *priv), |
|
struct netdev_nested_priv *priv) |
|
{ |
|
struct net_device *udev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; |
|
struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; |
|
int ret, cur = 0; |
|
|
|
now = dev; |
|
iter = &dev->adj_list.upper; |
|
|
|
while (1) { |
|
if (now != dev) { |
|
ret = fn(now, priv); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
next = NULL; |
|
while (1) { |
|
udev = netdev_next_upper_dev_rcu(now, &iter); |
|
if (!udev) |
|
break; |
|
|
|
next = udev; |
|
niter = &udev->adj_list.upper; |
|
dev_stack[cur] = now; |
|
iter_stack[cur++] = iter; |
|
break; |
|
} |
|
|
|
if (!next) { |
|
if (!cur) |
|
return 0; |
|
next = dev_stack[--cur]; |
|
niter = iter_stack[cur]; |
|
} |
|
|
|
now = next; |
|
iter = niter; |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(netdev_walk_all_upper_dev_rcu); |
|
|
|
static bool __netdev_has_upper_dev(struct net_device *dev, |
|
struct net_device *upper_dev) |
|
{ |
|
struct netdev_nested_priv priv = { |
|
.flags = 0, |
|
.data = (void *)upper_dev, |
|
}; |
|
|
|
ASSERT_RTNL(); |
|
|
|
return __netdev_walk_all_upper_dev(dev, ____netdev_has_upper_dev, |
|
&priv); |
|
} |
|
|
|
/** |
|
* netdev_lower_get_next_private - Get the next ->private from the |
|
* lower neighbour list |
|
* @dev: device |
|
* @iter: list_head ** of the current position |
|
* |
|
* Gets the next netdev_adjacent->private from the dev's lower neighbour |
|
* list, starting from iter position. The caller must hold either hold the |
|
* RTNL lock or its own locking that guarantees that the neighbour lower |
|
* list will remain unchanged. |
|
*/ |
|
void *netdev_lower_get_next_private(struct net_device *dev, |
|
struct list_head **iter) |
|
{ |
|
struct netdev_adjacent *lower; |
|
|
|
lower = list_entry(*iter, struct netdev_adjacent, list); |
|
|
|
if (&lower->list == &dev->adj_list.lower) |
|
return NULL; |
|
|
|
*iter = lower->list.next; |
|
|
|
return lower->private; |
|
} |
|
EXPORT_SYMBOL(netdev_lower_get_next_private); |
|
|
|
/** |
|
* netdev_lower_get_next_private_rcu - Get the next ->private from the |
|
* lower neighbour list, RCU |
|
* variant |
|
* @dev: device |
|
* @iter: list_head ** of the current position |
|
* |
|
* Gets the next netdev_adjacent->private from the dev's lower neighbour |
|
* list, starting from iter position. The caller must hold RCU read lock. |
|
*/ |
|
void *netdev_lower_get_next_private_rcu(struct net_device *dev, |
|
struct list_head **iter) |
|
{ |
|
struct netdev_adjacent *lower; |
|
|
|
WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held()); |
|
|
|
lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); |
|
|
|
if (&lower->list == &dev->adj_list.lower) |
|
return NULL; |
|
|
|
*iter = &lower->list; |
|
|
|
return lower->private; |
|
} |
|
EXPORT_SYMBOL(netdev_lower_get_next_private_rcu); |
|
|
|
/** |
|
* netdev_lower_get_next - Get the next device from the lower neighbour |
|
* list |
|
* @dev: device |
|
* @iter: list_head ** of the current position |
|
* |
|
* Gets the next netdev_adjacent from the dev's lower neighbour |
|
* list, starting from iter position. The caller must hold RTNL lock or |
|
* its own locking that guarantees that the neighbour lower |
|
* list will remain unchanged. |
|
*/ |
|
void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter) |
|
{ |
|
struct netdev_adjacent *lower; |
|
|
|
lower = list_entry(*iter, struct netdev_adjacent, list); |
|
|
|
if (&lower->list == &dev->adj_list.lower) |
|
return NULL; |
|
|
|
*iter = lower->list.next; |
|
|
|
return lower->dev; |
|
} |
|
EXPORT_SYMBOL(netdev_lower_get_next); |
|
|
|
static struct net_device *netdev_next_lower_dev(struct net_device *dev, |
|
struct list_head **iter) |
|
{ |
|
struct netdev_adjacent *lower; |
|
|
|
lower = list_entry((*iter)->next, struct netdev_adjacent, list); |
|
|
|
if (&lower->list == &dev->adj_list.lower) |
|
return NULL; |
|
|
|
*iter = &lower->list; |
|
|
|
return lower->dev; |
|
} |
|
|
|
static struct net_device *__netdev_next_lower_dev(struct net_device *dev, |
|
struct list_head **iter, |
|
bool *ignore) |
|
{ |
|
struct netdev_adjacent *lower; |
|
|
|
lower = list_entry((*iter)->next, struct netdev_adjacent, list); |
|
|
|
if (&lower->list == &dev->adj_list.lower) |
|
return NULL; |
|
|
|
*iter = &lower->list; |
|
*ignore = lower->ignore; |
|
|
|
return lower->dev; |
|
} |
|
|
|
int netdev_walk_all_lower_dev(struct net_device *dev, |
|
int (*fn)(struct net_device *dev, |
|
struct netdev_nested_priv *priv), |
|
struct netdev_nested_priv *priv) |
|
{ |
|
struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; |
|
struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; |
|
int ret, cur = 0; |
|
|
|
now = dev; |
|
iter = &dev->adj_list.lower; |
|
|
|
while (1) { |
|
if (now != dev) { |
|
ret = fn(now, priv); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
next = NULL; |
|
while (1) { |
|
ldev = netdev_next_lower_dev(now, &iter); |
|
if (!ldev) |
|
break; |
|
|
|
next = ldev; |
|
niter = &ldev->adj_list.lower; |
|
dev_stack[cur] = now; |
|
iter_stack[cur++] = iter; |
|
break; |
|
} |
|
|
|
if (!next) { |
|
if (!cur) |
|
return 0; |
|
next = dev_stack[--cur]; |
|
niter = iter_stack[cur]; |
|
} |
|
|
|
now = next; |
|
iter = niter; |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev); |
|
|
|
static int __netdev_walk_all_lower_dev(struct net_device *dev, |
|
int (*fn)(struct net_device *dev, |
|
struct netdev_nested_priv *priv), |
|
struct netdev_nested_priv *priv) |
|
{ |
|
struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; |
|
struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; |
|
int ret, cur = 0; |
|
bool ignore; |
|
|
|
now = dev; |
|
iter = &dev->adj_list.lower; |
|
|
|
while (1) { |
|
if (now != dev) { |
|
ret = fn(now, priv); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
next = NULL; |
|
while (1) { |
|
ldev = __netdev_next_lower_dev(now, &iter, &ignore); |
|
if (!ldev) |
|
break; |
|
if (ignore) |
|
continue; |
|
|
|
next = ldev; |
|
niter = &ldev->adj_list.lower; |
|
dev_stack[cur] = now; |
|
iter_stack[cur++] = iter; |
|
break; |
|
} |
|
|
|
if (!next) { |
|
if (!cur) |
|
return 0; |
|
next = dev_stack[--cur]; |
|
niter = iter_stack[cur]; |
|
} |
|
|
|
now = next; |
|
iter = niter; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
struct net_device *netdev_next_lower_dev_rcu(struct net_device *dev, |
|
struct list_head **iter) |
|
{ |
|
struct netdev_adjacent *lower; |
|
|
|
lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list); |
|
if (&lower->list == &dev->adj_list.lower) |
|
return NULL; |
|
|
|
*iter = &lower->list; |
|
|
|
return lower->dev; |
|
} |
|
EXPORT_SYMBOL(netdev_next_lower_dev_rcu); |
|
|
|
static u8 __netdev_upper_depth(struct net_device *dev) |
|
{ |
|
struct net_device *udev; |
|
struct list_head *iter; |
|
u8 max_depth = 0; |
|
bool ignore; |
|
|
|
for (iter = &dev->adj_list.upper, |
|
udev = __netdev_next_upper_dev(dev, &iter, &ignore); |
|
udev; |
|
udev = __netdev_next_upper_dev(dev, &iter, &ignore)) { |
|
if (ignore) |
|
continue; |
|
if (max_depth < udev->upper_level) |
|
max_depth = udev->upper_level; |
|
} |
|
|
|
return max_depth; |
|
} |
|
|
|
static u8 __netdev_lower_depth(struct net_device *dev) |
|
{ |
|
struct net_device *ldev; |
|
struct list_head *iter; |
|
u8 max_depth = 0; |
|
bool ignore; |
|
|
|
for (iter = &dev->adj_list.lower, |
|
ldev = __netdev_next_lower_dev(dev, &iter, &ignore); |
|
ldev; |
|
ldev = __netdev_next_lower_dev(dev, &iter, &ignore)) { |
|
if (ignore) |
|
continue; |
|
if (max_depth < ldev->lower_level) |
|
max_depth = ldev->lower_level; |
|
} |
|
|
|
return max_depth; |
|
} |
|
|
|
static int __netdev_update_upper_level(struct net_device *dev, |
|
struct netdev_nested_priv *__unused) |
|
{ |
|
dev->upper_level = __netdev_upper_depth(dev) + 1; |
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_LOCKDEP |
|
static LIST_HEAD(net_unlink_list); |
|
|
|
static void net_unlink_todo(struct net_device *dev) |
|
{ |
|
if (list_empty(&dev->unlink_list)) |
|
list_add_tail(&dev->unlink_list, &net_unlink_list); |
|
} |
|
#endif |
|
|
|
static int __netdev_update_lower_level(struct net_device *dev, |
|
struct netdev_nested_priv *priv) |
|
{ |
|
dev->lower_level = __netdev_lower_depth(dev) + 1; |
|
|
|
#ifdef CONFIG_LOCKDEP |
|
if (!priv) |
|
return 0; |
|
|
|
if (priv->flags & NESTED_SYNC_IMM) |
|
dev->nested_level = dev->lower_level - 1; |
|
if (priv->flags & NESTED_SYNC_TODO) |
|
net_unlink_todo(dev); |
|
#endif |
|
return 0; |
|
} |
|
|
|
int netdev_walk_all_lower_dev_rcu(struct net_device *dev, |
|
int (*fn)(struct net_device *dev, |
|
struct netdev_nested_priv *priv), |
|
struct netdev_nested_priv *priv) |
|
{ |
|
struct net_device *ldev, *next, *now, *dev_stack[MAX_NEST_DEV + 1]; |
|
struct list_head *niter, *iter, *iter_stack[MAX_NEST_DEV + 1]; |
|
int ret, cur = 0; |
|
|
|
now = dev; |
|
iter = &dev->adj_list.lower; |
|
|
|
while (1) { |
|
if (now != dev) { |
|
ret = fn(now, priv); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
next = NULL; |
|
while (1) { |
|
ldev = netdev_next_lower_dev_rcu(now, &iter); |
|
if (!ldev) |
|
break; |
|
|
|
next = ldev; |
|
niter = &ldev->adj_list.lower; |
|
dev_stack[cur] = now; |
|
iter_stack[cur++] = iter; |
|
break; |
|
} |
|
|
|
if (!next) { |
|
if (!cur) |
|
return 0; |
|
next = dev_stack[--cur]; |
|
niter = iter_stack[cur]; |
|
} |
|
|
|
now = next; |
|
iter = niter; |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(netdev_walk_all_lower_dev_rcu); |
|
|
|
/** |
|
* netdev_lower_get_first_private_rcu - Get the first ->private from the |
|
* lower neighbour list, RCU |
|
* variant |
|
* @dev: device |
|
* |
|
* Gets the first netdev_adjacent->private from the dev's lower neighbour |
|
* list. The caller must hold RCU read lock. |
|
*/ |
|
void *netdev_lower_get_first_private_rcu(struct net_device *dev) |
|
{ |
|
struct netdev_adjacent *lower; |
|
|
|
lower = list_first_or_null_rcu(&dev->adj_list.lower, |
|
struct netdev_adjacent, list); |
|
if (lower) |
|
return lower->private; |
|
return NULL; |
|
} |
|
EXPORT_SYMBOL(netdev_lower_get_first_private_rcu); |
|
|
|
/** |
|
* netdev_master_upper_dev_get_rcu - Get master upper device |
|
* @dev: device |
|
* |
|
* Find a master upper device and return pointer to it or NULL in case |
|
* it's not there. The caller must hold the RCU read lock. |
|
*/ |
|
struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev) |
|
{ |
|
struct netdev_adjacent *upper; |
|
|
|
upper = list_first_or_null_rcu(&dev->adj_list.upper, |
|
struct netdev_adjacent, list); |
|
if (upper && likely(upper->master)) |
|
return upper->dev; |
|
return NULL; |
|
} |
|
EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu); |
|
|
|
static int netdev_adjacent_sysfs_add(struct net_device *dev, |
|
struct net_device *adj_dev, |
|
struct list_head *dev_list) |
|
{ |
|
char linkname[IFNAMSIZ+7]; |
|
|
|
sprintf(linkname, dev_list == &dev->adj_list.upper ? |
|
"upper_%s" : "lower_%s", adj_dev->name); |
|
return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj), |
|
linkname); |
|
} |
|
static void netdev_adjacent_sysfs_del(struct net_device *dev, |
|
char *name, |
|
struct list_head *dev_list) |
|
{ |
|
char linkname[IFNAMSIZ+7]; |
|
|
|
sprintf(linkname, dev_list == &dev->adj_list.upper ? |
|
"upper_%s" : "lower_%s", name); |
|
sysfs_remove_link(&(dev->dev.kobj), linkname); |
|
} |
|
|
|
static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev, |
|
struct net_device *adj_dev, |
|
struct list_head *dev_list) |
|
{ |
|
return (dev_list == &dev->adj_list.upper || |
|
dev_list == &dev->adj_list.lower) && |
|
net_eq(dev_net(dev), dev_net(adj_dev)); |
|
} |
|
|
|
static int __netdev_adjacent_dev_insert(struct net_device *dev, |
|
struct net_device *adj_dev, |
|
struct list_head *dev_list, |
|
void *private, bool master) |
|
{ |
|
struct netdev_adjacent *adj; |
|
int ret; |
|
|
|
adj = __netdev_find_adj(adj_dev, dev_list); |
|
|
|
if (adj) { |
|
adj->ref_nr += 1; |
|
pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d\n", |
|
dev->name, adj_dev->name, adj->ref_nr); |
|
|
|
return 0; |
|
} |
|
|
|
adj = kmalloc(sizeof(*adj), GFP_KERNEL); |
|
if (!adj) |
|
return -ENOMEM; |
|
|
|
adj->dev = adj_dev; |
|
adj->master = master; |
|
adj->ref_nr = 1; |
|
adj->private = private; |
|
adj->ignore = false; |
|
netdev_hold(adj_dev, &adj->dev_tracker, GFP_KERNEL); |
|
|
|
pr_debug("Insert adjacency: dev %s adj_dev %s adj->ref_nr %d; dev_hold on %s\n", |
|
dev->name, adj_dev->name, adj->ref_nr, adj_dev->name); |
|
|
|
if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) { |
|
ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list); |
|
if (ret) |
|
goto free_adj; |
|
} |
|
|
|
/* Ensure that master link is always the first item in list. */ |
|
if (master) { |
|
ret = sysfs_create_link(&(dev->dev.kobj), |
|
&(adj_dev->dev.kobj), "master"); |
|
if (ret) |
|
goto remove_symlinks; |
|
|
|
list_add_rcu(&adj->list, dev_list); |
|
} else { |
|
list_add_tail_rcu(&adj->list, dev_list); |
|
} |
|
|
|
return 0; |
|
|
|
remove_symlinks: |
|
if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
|
netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
|
free_adj: |
|
netdev_put(adj_dev, &adj->dev_tracker); |
|
kfree(adj); |
|
|
|
return ret; |
|
} |
|
|
|
static void __netdev_adjacent_dev_remove(struct net_device *dev, |
|
struct net_device *adj_dev, |
|
u16 ref_nr, |
|
struct list_head *dev_list) |
|
{ |
|
struct netdev_adjacent *adj; |
|
|
|
pr_debug("Remove adjacency: dev %s adj_dev %s ref_nr %d\n", |
|
dev->name, adj_dev->name, ref_nr); |
|
|
|
adj = __netdev_find_adj(adj_dev, dev_list); |
|
|
|
if (!adj) { |
|
pr_err("Adjacency does not exist for device %s from %s\n", |
|
dev->name, adj_dev->name); |
|
WARN_ON(1); |
|
return; |
|
} |
|
|
|
if (adj->ref_nr > ref_nr) { |
|
pr_debug("adjacency: %s to %s ref_nr - %d = %d\n", |
|
dev->name, adj_dev->name, ref_nr, |
|
adj->ref_nr - ref_nr); |
|
adj->ref_nr -= ref_nr; |
|
return; |
|
} |
|
|
|
if (adj->master) |
|
sysfs_remove_link(&(dev->dev.kobj), "master"); |
|
|
|
if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) |
|
netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list); |
|
|
|
list_del_rcu(&adj->list); |
|
pr_debug("adjacency: dev_put for %s, because link removed from %s to %s\n", |
|
adj_dev->name, dev->name, adj_dev->name); |
|
netdev_put(adj_dev, &adj->dev_tracker); |
|
kfree_rcu(adj, rcu); |
|
} |
|
|
|
static int __netdev_adjacent_dev_link_lists(struct net_device *dev, |
|
struct net_device *upper_dev, |
|
struct list_head *up_list, |
|
struct list_head *down_list, |
|
void *private, bool master) |
|
{ |
|
int ret; |
|
|
|
ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, |
|
private, master); |
|
if (ret) |
|
return ret; |
|
|
|
ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, |
|
private, false); |
|
if (ret) { |
|
__netdev_adjacent_dev_remove(dev, upper_dev, 1, up_list); |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev, |
|
struct net_device *upper_dev, |
|
u16 ref_nr, |
|
struct list_head *up_list, |
|
struct list_head *down_list) |
|
{ |
|
__netdev_adjacent_dev_remove(dev, upper_dev, ref_nr, up_list); |
|
__netdev_adjacent_dev_remove(upper_dev, dev, ref_nr, down_list); |
|
} |
|
|
|
static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev, |
|
struct net_device *upper_dev, |
|
void *private, bool master) |
|
{ |
|
return __netdev_adjacent_dev_link_lists(dev, upper_dev, |
|
&dev->adj_list.upper, |
|
&upper_dev->adj_list.lower, |
|
private, master); |
|
} |
|
|
|
static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev, |
|
struct net_device *upper_dev) |
|
{ |
|
__netdev_adjacent_dev_unlink_lists(dev, upper_dev, 1, |
|
&dev->adj_list.upper, |
|
&upper_dev->adj_list.lower); |
|
} |
|
|
|
static int __netdev_upper_dev_link(struct net_device *dev, |
|
struct net_device *upper_dev, bool master, |
|
void *upper_priv, void *upper_info, |
|
struct netdev_nested_priv *priv, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct netdev_notifier_changeupper_info changeupper_info = { |
|
.info = { |
|
.dev = dev, |
|
.extack = extack, |
|
}, |
|
.upper_dev = upper_dev, |
|
.master = master, |
|
.linking = true, |
|
.upper_info = upper_info, |
|
}; |
|
struct net_device *master_dev; |
|
int ret = 0; |
|
|
|
ASSERT_RTNL(); |
|
|
|
if (dev == upper_dev) |
|
return -EBUSY; |
|
|
|
/* To prevent loops, check if dev is not upper device to upper_dev. */ |
|
if (__netdev_has_upper_dev(upper_dev, dev)) |
|
return -EBUSY; |
|
|
|
if ((dev->lower_level + upper_dev->upper_level) > MAX_NEST_DEV) |
|
return -EMLINK; |
|
|
|
if (!master) { |
|
if (__netdev_has_upper_dev(dev, upper_dev)) |
|
return -EEXIST; |
|
} else { |
|
master_dev = __netdev_master_upper_dev_get(dev); |
|
if (master_dev) |
|
return master_dev == upper_dev ? -EEXIST : -EBUSY; |
|
} |
|
|
|
ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, |
|
&changeupper_info.info); |
|
ret = notifier_to_errno(ret); |
|
if (ret) |
|
return ret; |
|
|
|
ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv, |
|
master); |
|
if (ret) |
|
return ret; |
|
|
|
ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, |
|
&changeupper_info.info); |
|
ret = notifier_to_errno(ret); |
|
if (ret) |
|
goto rollback; |
|
|
|
__netdev_update_upper_level(dev, NULL); |
|
__netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL); |
|
|
|
__netdev_update_lower_level(upper_dev, priv); |
|
__netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level, |
|
priv); |
|
|
|
return 0; |
|
|
|
rollback: |
|
__netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* netdev_upper_dev_link - Add a link to the upper device |
|
* @dev: device |
|
* @upper_dev: new upper device |
|
* @extack: netlink extended ack |
|
* |
|
* Adds a link to device which is upper to this one. The caller must hold |
|
* the RTNL lock. On a failure a negative errno code is returned. |
|
* On success the reference counts are adjusted and the function |
|
* returns zero. |
|
*/ |
|
int netdev_upper_dev_link(struct net_device *dev, |
|
struct net_device *upper_dev, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct netdev_nested_priv priv = { |
|
.flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, |
|
.data = NULL, |
|
}; |
|
|
|
return __netdev_upper_dev_link(dev, upper_dev, false, |
|
NULL, NULL, &priv, extack); |
|
} |
|
EXPORT_SYMBOL(netdev_upper_dev_link); |
|
|
|
/** |
|
* netdev_master_upper_dev_link - Add a master link to the upper device |
|
* @dev: device |
|
* @upper_dev: new upper device |
|
* @upper_priv: upper device private |
|
* @upper_info: upper info to be passed down via notifier |
|
* @extack: netlink extended ack |
|
* |
|
* Adds a link to device which is upper to this one. In this case, only |
|
* one master upper device can be linked, although other non-master devices |
|
* might be linked as well. The caller must hold the RTNL lock. |
|
* On a failure a negative errno code is returned. On success the reference |
|
* counts are adjusted and the function returns zero. |
|
*/ |
|
int netdev_master_upper_dev_link(struct net_device *dev, |
|
struct net_device *upper_dev, |
|
void *upper_priv, void *upper_info, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct netdev_nested_priv priv = { |
|
.flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, |
|
.data = NULL, |
|
}; |
|
|
|
return __netdev_upper_dev_link(dev, upper_dev, true, |
|
upper_priv, upper_info, &priv, extack); |
|
} |
|
EXPORT_SYMBOL(netdev_master_upper_dev_link); |
|
|
|
static void __netdev_upper_dev_unlink(struct net_device *dev, |
|
struct net_device *upper_dev, |
|
struct netdev_nested_priv *priv) |
|
{ |
|
struct netdev_notifier_changeupper_info changeupper_info = { |
|
.info = { |
|
.dev = dev, |
|
}, |
|
.upper_dev = upper_dev, |
|
.linking = false, |
|
}; |
|
|
|
ASSERT_RTNL(); |
|
|
|
changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev; |
|
|
|
call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, |
|
&changeupper_info.info); |
|
|
|
__netdev_adjacent_dev_unlink_neighbour(dev, upper_dev); |
|
|
|
call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, |
|
&changeupper_info.info); |
|
|
|
__netdev_update_upper_level(dev, NULL); |
|
__netdev_walk_all_lower_dev(dev, __netdev_update_upper_level, NULL); |
|
|
|
__netdev_update_lower_level(upper_dev, priv); |
|
__netdev_walk_all_upper_dev(upper_dev, __netdev_update_lower_level, |
|
priv); |
|
} |
|
|
|
/** |
|
* netdev_upper_dev_unlink - Removes a link to upper device |
|
* @dev: device |
|
* @upper_dev: new upper device |
|
* |
|
* Removes a link to device which is upper to this one. The caller must hold |
|
* the RTNL lock. |
|
*/ |
|
void netdev_upper_dev_unlink(struct net_device *dev, |
|
struct net_device *upper_dev) |
|
{ |
|
struct netdev_nested_priv priv = { |
|
.flags = NESTED_SYNC_TODO, |
|
.data = NULL, |
|
}; |
|
|
|
__netdev_upper_dev_unlink(dev, upper_dev, &priv); |
|
} |
|
EXPORT_SYMBOL(netdev_upper_dev_unlink); |
|
|
|
static void __netdev_adjacent_dev_set(struct net_device *upper_dev, |
|
struct net_device *lower_dev, |
|
bool val) |
|
{ |
|
struct netdev_adjacent *adj; |
|
|
|
adj = __netdev_find_adj(lower_dev, &upper_dev->adj_list.lower); |
|
if (adj) |
|
adj->ignore = val; |
|
|
|
adj = __netdev_find_adj(upper_dev, &lower_dev->adj_list.upper); |
|
if (adj) |
|
adj->ignore = val; |
|
} |
|
|
|
static void netdev_adjacent_dev_disable(struct net_device *upper_dev, |
|
struct net_device *lower_dev) |
|
{ |
|
__netdev_adjacent_dev_set(upper_dev, lower_dev, true); |
|
} |
|
|
|
static void netdev_adjacent_dev_enable(struct net_device *upper_dev, |
|
struct net_device *lower_dev) |
|
{ |
|
__netdev_adjacent_dev_set(upper_dev, lower_dev, false); |
|
} |
|
|
|
int netdev_adjacent_change_prepare(struct net_device *old_dev, |
|
struct net_device *new_dev, |
|
struct net_device *dev, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct netdev_nested_priv priv = { |
|
.flags = 0, |
|
.data = NULL, |
|
}; |
|
int err; |
|
|
|
if (!new_dev) |
|
return 0; |
|
|
|
if (old_dev && new_dev != old_dev) |
|
netdev_adjacent_dev_disable(dev, old_dev); |
|
err = __netdev_upper_dev_link(new_dev, dev, false, NULL, NULL, &priv, |
|
extack); |
|
if (err) { |
|
if (old_dev && new_dev != old_dev) |
|
netdev_adjacent_dev_enable(dev, old_dev); |
|
return err; |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(netdev_adjacent_change_prepare); |
|
|
|
void netdev_adjacent_change_commit(struct net_device *old_dev, |
|
struct net_device *new_dev, |
|
struct net_device *dev) |
|
{ |
|
struct netdev_nested_priv priv = { |
|
.flags = NESTED_SYNC_IMM | NESTED_SYNC_TODO, |
|
.data = NULL, |
|
}; |
|
|
|
if (!new_dev || !old_dev) |
|
return; |
|
|
|
if (new_dev == old_dev) |
|
return; |
|
|
|
netdev_adjacent_dev_enable(dev, old_dev); |
|
__netdev_upper_dev_unlink(old_dev, dev, &priv); |
|
} |
|
EXPORT_SYMBOL(netdev_adjacent_change_commit); |
|
|
|
void netdev_adjacent_change_abort(struct net_device *old_dev, |
|
struct net_device *new_dev, |
|
struct net_device *dev) |
|
{ |
|
struct netdev_nested_priv priv = { |
|
.flags = 0, |
|
.data = NULL, |
|
}; |
|
|
|
if (!new_dev) |
|
return; |
|
|
|
if (old_dev && new_dev != old_dev) |
|
netdev_adjacent_dev_enable(dev, old_dev); |
|
|
|
__netdev_upper_dev_unlink(new_dev, dev, &priv); |
|
} |
|
EXPORT_SYMBOL(netdev_adjacent_change_abort); |
|
|
|
/** |
|
* netdev_bonding_info_change - Dispatch event about slave change |
|
* @dev: device |
|
* @bonding_info: info to dispatch |
|
* |
|
* Send NETDEV_BONDING_INFO to netdev notifiers with info. |
|
* The caller must hold the RTNL lock. |
|
*/ |
|
void netdev_bonding_info_change(struct net_device *dev, |
|
struct netdev_bonding_info *bonding_info) |
|
{ |
|
struct netdev_notifier_bonding_info info = { |
|
.info.dev = dev, |
|
}; |
|
|
|
memcpy(&info.bonding_info, bonding_info, |
|
sizeof(struct netdev_bonding_info)); |
|
call_netdevice_notifiers_info(NETDEV_BONDING_INFO, |
|
&info.info); |
|
} |
|
EXPORT_SYMBOL(netdev_bonding_info_change); |
|
|
|
static int netdev_offload_xstats_enable_l3(struct net_device *dev, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct netdev_notifier_offload_xstats_info info = { |
|
.info.dev = dev, |
|
.info.extack = extack, |
|
.type = NETDEV_OFFLOAD_XSTATS_TYPE_L3, |
|
}; |
|
int err; |
|
int rc; |
|
|
|
dev->offload_xstats_l3 = kzalloc(sizeof(*dev->offload_xstats_l3), |
|
GFP_KERNEL); |
|
if (!dev->offload_xstats_l3) |
|
return -ENOMEM; |
|
|
|
rc = call_netdevice_notifiers_info_robust(NETDEV_OFFLOAD_XSTATS_ENABLE, |
|
NETDEV_OFFLOAD_XSTATS_DISABLE, |
|
&info.info); |
|
err = notifier_to_errno(rc); |
|
if (err) |
|
goto free_stats; |
|
|
|
return 0; |
|
|
|
free_stats: |
|
kfree(dev->offload_xstats_l3); |
|
dev->offload_xstats_l3 = NULL; |
|
return err; |
|
} |
|
|
|
int netdev_offload_xstats_enable(struct net_device *dev, |
|
enum netdev_offload_xstats_type type, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
ASSERT_RTNL(); |
|
|
|
if (netdev_offload_xstats_enabled(dev, type)) |
|
return -EALREADY; |
|
|
|
switch (type) { |
|
case NETDEV_OFFLOAD_XSTATS_TYPE_L3: |
|
return netdev_offload_xstats_enable_l3(dev, extack); |
|
} |
|
|
|
WARN_ON(1); |
|
return -EINVAL; |
|
} |
|
EXPORT_SYMBOL(netdev_offload_xstats_enable); |
|
|
|
static void netdev_offload_xstats_disable_l3(struct net_device *dev) |
|
{ |
|
struct netdev_notifier_offload_xstats_info info = { |
|
.info.dev = dev, |
|
.type = NETDEV_OFFLOAD_XSTATS_TYPE_L3, |
|
}; |
|
|
|
call_netdevice_notifiers_info(NETDEV_OFFLOAD_XSTATS_DISABLE, |
|
&info.info); |
|
kfree(dev->offload_xstats_l3); |
|
dev->offload_xstats_l3 = NULL; |
|
} |
|
|
|
int netdev_offload_xstats_disable(struct net_device *dev, |
|
enum netdev_offload_xstats_type type) |
|
{ |
|
ASSERT_RTNL(); |
|
|
|
if (!netdev_offload_xstats_enabled(dev, type)) |
|
return -EALREADY; |
|
|
|
switch (type) { |
|
case NETDEV_OFFLOAD_XSTATS_TYPE_L3: |
|
netdev_offload_xstats_disable_l3(dev); |
|
return 0; |
|
} |
|
|
|
WARN_ON(1); |
|
return -EINVAL; |
|
} |
|
EXPORT_SYMBOL(netdev_offload_xstats_disable); |
|
|
|
static void netdev_offload_xstats_disable_all(struct net_device *dev) |
|
{ |
|
netdev_offload_xstats_disable(dev, NETDEV_OFFLOAD_XSTATS_TYPE_L3); |
|
} |
|
|
|
static struct rtnl_hw_stats64 * |
|
netdev_offload_xstats_get_ptr(const struct net_device *dev, |
|
enum netdev_offload_xstats_type type) |
|
{ |
|
switch (type) { |
|
case NETDEV_OFFLOAD_XSTATS_TYPE_L3: |
|
return dev->offload_xstats_l3; |
|
} |
|
|
|
WARN_ON(1); |
|
return NULL; |
|
} |
|
|
|
bool netdev_offload_xstats_enabled(const struct net_device *dev, |
|
enum netdev_offload_xstats_type type) |
|
{ |
|
ASSERT_RTNL(); |
|
|
|
return netdev_offload_xstats_get_ptr(dev, type); |
|
} |
|
EXPORT_SYMBOL(netdev_offload_xstats_enabled); |
|
|
|
struct netdev_notifier_offload_xstats_ru { |
|
bool used; |
|
}; |
|
|
|
struct netdev_notifier_offload_xstats_rd { |
|
struct rtnl_hw_stats64 stats; |
|
bool used; |
|
}; |
|
|
|
static void netdev_hw_stats64_add(struct rtnl_hw_stats64 *dest, |
|
const struct rtnl_hw_stats64 *src) |
|
{ |
|
dest->rx_packets += src->rx_packets; |
|
dest->tx_packets += src->tx_packets; |
|
dest->rx_bytes += src->rx_bytes; |
|
dest->tx_bytes += src->tx_bytes; |
|
dest->rx_errors += src->rx_errors; |
|
dest->tx_errors += src->tx_errors; |
|
dest->rx_dropped += src->rx_dropped; |
|
dest->tx_dropped += src->tx_dropped; |
|
dest->multicast += src->multicast; |
|
} |
|
|
|
static int netdev_offload_xstats_get_used(struct net_device *dev, |
|
enum netdev_offload_xstats_type type, |
|
bool *p_used, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct netdev_notifier_offload_xstats_ru report_used = {}; |
|
struct netdev_notifier_offload_xstats_info info = { |
|
.info.dev = dev, |
|
.info.extack = extack, |
|
.type = type, |
|
.report_used = &report_used, |
|
}; |
|
int rc; |
|
|
|
WARN_ON(!netdev_offload_xstats_enabled(dev, type)); |
|
rc = call_netdevice_notifiers_info(NETDEV_OFFLOAD_XSTATS_REPORT_USED, |
|
&info.info); |
|
*p_used = report_used.used; |
|
return notifier_to_errno(rc); |
|
} |
|
|
|
static int netdev_offload_xstats_get_stats(struct net_device *dev, |
|
enum netdev_offload_xstats_type type, |
|
struct rtnl_hw_stats64 *p_stats, |
|
bool *p_used, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct netdev_notifier_offload_xstats_rd report_delta = {}; |
|
struct netdev_notifier_offload_xstats_info info = { |
|
.info.dev = dev, |
|
.info.extack = extack, |
|
.type = type, |
|
.report_delta = &report_delta, |
|
}; |
|
struct rtnl_hw_stats64 *stats; |
|
int rc; |
|
|
|
stats = netdev_offload_xstats_get_ptr(dev, type); |
|
if (WARN_ON(!stats)) |
|
return -EINVAL; |
|
|
|
rc = call_netdevice_notifiers_info(NETDEV_OFFLOAD_XSTATS_REPORT_DELTA, |
|
&info.info); |
|
|
|
/* Cache whatever we got, even if there was an error, otherwise the |
|
* successful stats retrievals would get lost. |
|
*/ |
|
netdev_hw_stats64_add(stats, &report_delta.stats); |
|
|
|
if (p_stats) |
|
*p_stats = *stats; |
|
*p_used = report_delta.used; |
|
|
|
return notifier_to_errno(rc); |
|
} |
|
|
|
int netdev_offload_xstats_get(struct net_device *dev, |
|
enum netdev_offload_xstats_type type, |
|
struct rtnl_hw_stats64 *p_stats, bool *p_used, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
ASSERT_RTNL(); |
|
|
|
if (p_stats) |
|
return netdev_offload_xstats_get_stats(dev, type, p_stats, |
|
p_used, extack); |
|
else |
|
return netdev_offload_xstats_get_used(dev, type, p_used, |
|
extack); |
|
} |
|
EXPORT_SYMBOL(netdev_offload_xstats_get); |
|
|
|
void |
|
netdev_offload_xstats_report_delta(struct netdev_notifier_offload_xstats_rd *report_delta, |
|
const struct rtnl_hw_stats64 *stats) |
|
{ |
|
report_delta->used = true; |
|
netdev_hw_stats64_add(&report_delta->stats, stats); |
|
} |
|
EXPORT_SYMBOL(netdev_offload_xstats_report_delta); |
|
|
|
void |
|
netdev_offload_xstats_report_used(struct netdev_notifier_offload_xstats_ru *report_used) |
|
{ |
|
report_used->used = true; |
|
} |
|
EXPORT_SYMBOL(netdev_offload_xstats_report_used); |
|
|
|
void netdev_offload_xstats_push_delta(struct net_device *dev, |
|
enum netdev_offload_xstats_type type, |
|
const struct rtnl_hw_stats64 *p_stats) |
|
{ |
|
struct rtnl_hw_stats64 *stats; |
|
|
|
ASSERT_RTNL(); |
|
|
|
stats = netdev_offload_xstats_get_ptr(dev, type); |
|
if (WARN_ON(!stats)) |
|
return; |
|
|
|
netdev_hw_stats64_add(stats, p_stats); |
|
} |
|
EXPORT_SYMBOL(netdev_offload_xstats_push_delta); |
|
|
|
/** |
|
* netdev_get_xmit_slave - Get the xmit slave of master device |
|
* @dev: device |
|
* @skb: The packet |
|
* @all_slaves: assume all the slaves are active |
|
* |
|
* The reference counters are not incremented so the caller must be |
|
* careful with locks. The caller must hold RCU lock. |
|
* %NULL is returned if no slave is found. |
|
*/ |
|
|
|
struct net_device *netdev_get_xmit_slave(struct net_device *dev, |
|
struct sk_buff *skb, |
|
bool all_slaves) |
|
{ |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
|
|
if (!ops->ndo_get_xmit_slave) |
|
return NULL; |
|
return ops->ndo_get_xmit_slave(dev, skb, all_slaves); |
|
} |
|
EXPORT_SYMBOL(netdev_get_xmit_slave); |
|
|
|
static struct net_device *netdev_sk_get_lower_dev(struct net_device *dev, |
|
struct sock *sk) |
|
{ |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
|
|
if (!ops->ndo_sk_get_lower_dev) |
|
return NULL; |
|
return ops->ndo_sk_get_lower_dev(dev, sk); |
|
} |
|
|
|
/** |
|
* netdev_sk_get_lowest_dev - Get the lowest device in chain given device and socket |
|
* @dev: device |
|
* @sk: the socket |
|
* |
|
* %NULL is returned if no lower device is found. |
|
*/ |
|
|
|
struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev, |
|
struct sock *sk) |
|
{ |
|
struct net_device *lower; |
|
|
|
lower = netdev_sk_get_lower_dev(dev, sk); |
|
while (lower) { |
|
dev = lower; |
|
lower = netdev_sk_get_lower_dev(dev, sk); |
|
} |
|
|
|
return dev; |
|
} |
|
EXPORT_SYMBOL(netdev_sk_get_lowest_dev); |
|
|
|
static void netdev_adjacent_add_links(struct net_device *dev) |
|
{ |
|
struct netdev_adjacent *iter; |
|
|
|
struct net *net = dev_net(dev); |
|
|
|
list_for_each_entry(iter, &dev->adj_list.upper, list) { |
|
if (!net_eq(net, dev_net(iter->dev))) |
|
continue; |
|
netdev_adjacent_sysfs_add(iter->dev, dev, |
|
&iter->dev->adj_list.lower); |
|
netdev_adjacent_sysfs_add(dev, iter->dev, |
|
&dev->adj_list.upper); |
|
} |
|
|
|
list_for_each_entry(iter, &dev->adj_list.lower, list) { |
|
if (!net_eq(net, dev_net(iter->dev))) |
|
continue; |
|
netdev_adjacent_sysfs_add(iter->dev, dev, |
|
&iter->dev->adj_list.upper); |
|
netdev_adjacent_sysfs_add(dev, iter->dev, |
|
&dev->adj_list.lower); |
|
} |
|
} |
|
|
|
static void netdev_adjacent_del_links(struct net_device *dev) |
|
{ |
|
struct netdev_adjacent *iter; |
|
|
|
struct net *net = dev_net(dev); |
|
|
|
list_for_each_entry(iter, &dev->adj_list.upper, list) { |
|
if (!net_eq(net, dev_net(iter->dev))) |
|
continue; |
|
netdev_adjacent_sysfs_del(iter->dev, dev->name, |
|
&iter->dev->adj_list.lower); |
|
netdev_adjacent_sysfs_del(dev, iter->dev->name, |
|
&dev->adj_list.upper); |
|
} |
|
|
|
list_for_each_entry(iter, &dev->adj_list.lower, list) { |
|
if (!net_eq(net, dev_net(iter->dev))) |
|
continue; |
|
netdev_adjacent_sysfs_del(iter->dev, dev->name, |
|
&iter->dev->adj_list.upper); |
|
netdev_adjacent_sysfs_del(dev, iter->dev->name, |
|
&dev->adj_list.lower); |
|
} |
|
} |
|
|
|
void netdev_adjacent_rename_links(struct net_device *dev, char *oldname) |
|
{ |
|
struct netdev_adjacent *iter; |
|
|
|
struct net *net = dev_net(dev); |
|
|
|
list_for_each_entry(iter, &dev->adj_list.upper, list) { |
|
if (!net_eq(net, dev_net(iter->dev))) |
|
continue; |
|
netdev_adjacent_sysfs_del(iter->dev, oldname, |
|
&iter->dev->adj_list.lower); |
|
netdev_adjacent_sysfs_add(iter->dev, dev, |
|
&iter->dev->adj_list.lower); |
|
} |
|
|
|
list_for_each_entry(iter, &dev->adj_list.lower, list) { |
|
if (!net_eq(net, dev_net(iter->dev))) |
|
continue; |
|
netdev_adjacent_sysfs_del(iter->dev, oldname, |
|
&iter->dev->adj_list.upper); |
|
netdev_adjacent_sysfs_add(iter->dev, dev, |
|
&iter->dev->adj_list.upper); |
|
} |
|
} |
|
|
|
void *netdev_lower_dev_get_private(struct net_device *dev, |
|
struct net_device *lower_dev) |
|
{ |
|
struct netdev_adjacent *lower; |
|
|
|
if (!lower_dev) |
|
return NULL; |
|
lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower); |
|
if (!lower) |
|
return NULL; |
|
|
|
return lower->private; |
|
} |
|
EXPORT_SYMBOL(netdev_lower_dev_get_private); |
|
|
|
|
|
/** |
|
* netdev_lower_state_changed - Dispatch event about lower device state change |
|
* @lower_dev: device |
|
* @lower_state_info: state to dispatch |
|
* |
|
* Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info. |
|
* The caller must hold the RTNL lock. |
|
*/ |
|
void netdev_lower_state_changed(struct net_device *lower_dev, |
|
void *lower_state_info) |
|
{ |
|
struct netdev_notifier_changelowerstate_info changelowerstate_info = { |
|
.info.dev = lower_dev, |
|
}; |
|
|
|
ASSERT_RTNL(); |
|
changelowerstate_info.lower_state_info = lower_state_info; |
|
call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, |
|
&changelowerstate_info.info); |
|
} |
|
EXPORT_SYMBOL(netdev_lower_state_changed); |
|
|
|
static void dev_change_rx_flags(struct net_device *dev, int flags) |
|
{ |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
|
|
if (ops->ndo_change_rx_flags) |
|
ops->ndo_change_rx_flags(dev, flags); |
|
} |
|
|
|
static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify) |
|
{ |
|
unsigned int old_flags = dev->flags; |
|
kuid_t uid; |
|
kgid_t gid; |
|
|
|
ASSERT_RTNL(); |
|
|
|
dev->flags |= IFF_PROMISC; |
|
dev->promiscuity += inc; |
|
if (dev->promiscuity == 0) { |
|
/* |
|
* Avoid overflow. |
|
* If inc causes overflow, untouch promisc and return error. |
|
*/ |
|
if (inc < 0) |
|
dev->flags &= ~IFF_PROMISC; |
|
else { |
|
dev->promiscuity -= inc; |
|
netdev_warn(dev, "promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n"); |
|
return -EOVERFLOW; |
|
} |
|
} |
|
if (dev->flags != old_flags) { |
|
pr_info("device %s %s promiscuous mode\n", |
|
dev->name, |
|
dev->flags & IFF_PROMISC ? "entered" : "left"); |
|
if (audit_enabled) { |
|
current_uid_gid(&uid, &gid); |
|
audit_log(audit_context(), GFP_ATOMIC, |
|
AUDIT_ANOM_PROMISCUOUS, |
|
"dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", |
|
dev->name, (dev->flags & IFF_PROMISC), |
|
(old_flags & IFF_PROMISC), |
|
from_kuid(&init_user_ns, audit_get_loginuid(current)), |
|
from_kuid(&init_user_ns, uid), |
|
from_kgid(&init_user_ns, gid), |
|
audit_get_sessionid(current)); |
|
} |
|
|
|
dev_change_rx_flags(dev, IFF_PROMISC); |
|
} |
|
if (notify) |
|
__dev_notify_flags(dev, old_flags, IFF_PROMISC); |
|
return 0; |
|
} |
|
|
|
/** |
|
* dev_set_promiscuity - update promiscuity count on a device |
|
* @dev: device |
|
* @inc: modifier |
|
* |
|
* Add or remove promiscuity from a device. While the count in the device |
|
* remains above zero the interface remains promiscuous. Once it hits zero |
|
* the device reverts back to normal filtering operation. A negative inc |
|
* value is used to drop promiscuity on the device. |
|
* Return 0 if successful or a negative errno code on error. |
|
*/ |
|
int dev_set_promiscuity(struct net_device *dev, int inc) |
|
{ |
|
unsigned int old_flags = dev->flags; |
|
int err; |
|
|
|
err = __dev_set_promiscuity(dev, inc, true); |
|
if (err < 0) |
|
return err; |
|
if (dev->flags != old_flags) |
|
dev_set_rx_mode(dev); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(dev_set_promiscuity); |
|
|
|
static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify) |
|
{ |
|
unsigned int old_flags = dev->flags, old_gflags = dev->gflags; |
|
|
|
ASSERT_RTNL(); |
|
|
|
dev->flags |= IFF_ALLMULTI; |
|
dev->allmulti += inc; |
|
if (dev->allmulti == 0) { |
|
/* |
|
* Avoid overflow. |
|
* If inc causes overflow, untouch allmulti and return error. |
|
*/ |
|
if (inc < 0) |
|
dev->flags &= ~IFF_ALLMULTI; |
|
else { |
|
dev->allmulti -= inc; |
|
netdev_warn(dev, "allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n"); |
|
return -EOVERFLOW; |
|
} |
|
} |
|
if (dev->flags ^ old_flags) { |
|
dev_change_rx_flags(dev, IFF_ALLMULTI); |
|
dev_set_rx_mode(dev); |
|
if (notify) |
|
__dev_notify_flags(dev, old_flags, |
|
dev->gflags ^ old_gflags); |
|
} |
|
return 0; |
|
} |
|
|
|
/** |
|
* dev_set_allmulti - update allmulti count on a device |
|
* @dev: device |
|
* @inc: modifier |
|
* |
|
* Add or remove reception of all multicast frames to a device. While the |
|
* count in the device remains above zero the interface remains listening |
|
* to all interfaces. Once it hits zero the device reverts back to normal |
|
* filtering operation. A negative @inc value is used to drop the counter |
|
* when releasing a resource needing all multicasts. |
|
* Return 0 if successful or a negative errno code on error. |
|
*/ |
|
|
|
int dev_set_allmulti(struct net_device *dev, int inc) |
|
{ |
|
return __dev_set_allmulti(dev, inc, true); |
|
} |
|
EXPORT_SYMBOL(dev_set_allmulti); |
|
|
|
/* |
|
* Upload unicast and multicast address lists to device and |
|
* configure RX filtering. When the device doesn't support unicast |
|
* filtering it is put in promiscuous mode while unicast addresses |
|
* are present. |
|
*/ |
|
void __dev_set_rx_mode(struct net_device *dev) |
|
{ |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
|
|
/* dev_open will call this function so the list will stay sane. */ |
|
if (!(dev->flags&IFF_UP)) |
|
return; |
|
|
|
if (!netif_device_present(dev)) |
|
return; |
|
|
|
if (!(dev->priv_flags & IFF_UNICAST_FLT)) { |
|
/* Unicast addresses changes may only happen under the rtnl, |
|
* therefore calling __dev_set_promiscuity here is safe. |
|
*/ |
|
if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
|
__dev_set_promiscuity(dev, 1, false); |
|
dev->uc_promisc = true; |
|
} else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
|
__dev_set_promiscuity(dev, -1, false); |
|
dev->uc_promisc = false; |
|
} |
|
} |
|
|
|
if (ops->ndo_set_rx_mode) |
|
ops->ndo_set_rx_mode(dev); |
|
} |
|
|
|
void dev_set_rx_mode(struct net_device *dev) |
|
{ |
|
netif_addr_lock_bh(dev); |
|
__dev_set_rx_mode(dev); |
|
netif_addr_unlock_bh(dev); |
|
} |
|
|
|
/** |
|
* dev_get_flags - get flags reported to userspace |
|
* @dev: device |
|
* |
|
* Get the combination of flag bits exported through APIs to userspace. |
|
*/ |
|
unsigned int dev_get_flags(const struct net_device *dev) |
|
{ |
|
unsigned int flags; |
|
|
|
flags = (dev->flags & ~(IFF_PROMISC | |
|
IFF_ALLMULTI | |
|
IFF_RUNNING | |
|
IFF_LOWER_UP | |
|
IFF_DORMANT)) | |
|
(dev->gflags & (IFF_PROMISC | |
|
IFF_ALLMULTI)); |
|
|
|
if (netif_running(dev)) { |
|
if (netif_oper_up(dev)) |
|
flags |= IFF_RUNNING; |
|
if (netif_carrier_ok(dev)) |
|
flags |= IFF_LOWER_UP; |
|
if (netif_dormant(dev)) |
|
flags |= IFF_DORMANT; |
|
} |
|
|
|
return flags; |
|
} |
|
EXPORT_SYMBOL(dev_get_flags); |
|
|
|
int __dev_change_flags(struct net_device *dev, unsigned int flags, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
unsigned int old_flags = dev->flags; |
|
int ret; |
|
|
|
ASSERT_RTNL(); |
|
|
|
/* |
|
* Set the flags on our device. |
|
*/ |
|
|
|
dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | |
|
IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | |
|
IFF_AUTOMEDIA)) | |
|
(dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | |
|
IFF_ALLMULTI)); |
|
|
|
/* |
|
* Load in the correct multicast list now the flags have changed. |
|
*/ |
|
|
|
if ((old_flags ^ flags) & IFF_MULTICAST) |
|
dev_change_rx_flags(dev, IFF_MULTICAST); |
|
|
|
dev_set_rx_mode(dev); |
|
|
|
/* |
|
* Have we downed the interface. We handle IFF_UP ourselves |
|
* according to user attempts to set it, rather than blindly |
|
* setting it. |
|
*/ |
|
|
|
ret = 0; |
|
if ((old_flags ^ flags) & IFF_UP) { |
|
if (old_flags & IFF_UP) |
|
__dev_close(dev); |
|
else |
|
ret = __dev_open(dev, extack); |
|
} |
|
|
|
if ((flags ^ dev->gflags) & IFF_PROMISC) { |
|
int inc = (flags & IFF_PROMISC) ? 1 : -1; |
|
unsigned int old_flags = dev->flags; |
|
|
|
dev->gflags ^= IFF_PROMISC; |
|
|
|
if (__dev_set_promiscuity(dev, inc, false) >= 0) |
|
if (dev->flags != old_flags) |
|
dev_set_rx_mode(dev); |
|
} |
|
|
|
/* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI |
|
* is important. Some (broken) drivers set IFF_PROMISC, when |
|
* IFF_ALLMULTI is requested not asking us and not reporting. |
|
*/ |
|
if ((flags ^ dev->gflags) & IFF_ALLMULTI) { |
|
int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
|
|
|
dev->gflags ^= IFF_ALLMULTI; |
|
__dev_set_allmulti(dev, inc, false); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
void __dev_notify_flags(struct net_device *dev, unsigned int old_flags, |
|
unsigned int gchanges) |
|
{ |
|
unsigned int changes = dev->flags ^ old_flags; |
|
|
|
if (gchanges) |
|
rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC); |
|
|
|
if (changes & IFF_UP) { |
|
if (dev->flags & IFF_UP) |
|
call_netdevice_notifiers(NETDEV_UP, dev); |
|
else |
|
call_netdevice_notifiers(NETDEV_DOWN, dev); |
|
} |
|
|
|
if (dev->flags & IFF_UP && |
|
(changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) { |
|
struct netdev_notifier_change_info change_info = { |
|
.info = { |
|
.dev = dev, |
|
}, |
|
.flags_changed = changes, |
|
}; |
|
|
|
call_netdevice_notifiers_info(NETDEV_CHANGE, &change_info.info); |
|
} |
|
} |
|
|
|
/** |
|
* dev_change_flags - change device settings |
|
* @dev: device |
|
* @flags: device state flags |
|
* @extack: netlink extended ack |
|
* |
|
* Change settings on device based state flags. The flags are |
|
* in the userspace exported format. |
|
*/ |
|
int dev_change_flags(struct net_device *dev, unsigned int flags, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
int ret; |
|
unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags; |
|
|
|
ret = __dev_change_flags(dev, flags, extack); |
|
if (ret < 0) |
|
return ret; |
|
|
|
changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags); |
|
__dev_notify_flags(dev, old_flags, changes); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(dev_change_flags); |
|
|
|
int __dev_set_mtu(struct net_device *dev, int new_mtu) |
|
{ |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
|
|
if (ops->ndo_change_mtu) |
|
return ops->ndo_change_mtu(dev, new_mtu); |
|
|
|
/* Pairs with all the lockless reads of dev->mtu in the stack */ |
|
WRITE_ONCE(dev->mtu, new_mtu); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(__dev_set_mtu); |
|
|
|
int dev_validate_mtu(struct net_device *dev, int new_mtu, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
/* MTU must be positive, and in range */ |
|
if (new_mtu < 0 || new_mtu < dev->min_mtu) { |
|
NL_SET_ERR_MSG(extack, "mtu less than device minimum"); |
|
return -EINVAL; |
|
} |
|
|
|
if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) { |
|
NL_SET_ERR_MSG(extack, "mtu greater than device maximum"); |
|
return -EINVAL; |
|
} |
|
return 0; |
|
} |
|
|
|
/** |
|
* dev_set_mtu_ext - Change maximum transfer unit |
|
* @dev: device |
|
* @new_mtu: new transfer unit |
|
* @extack: netlink extended ack |
|
* |
|
* Change the maximum transfer size of the network device. |
|
*/ |
|
int dev_set_mtu_ext(struct net_device *dev, int new_mtu, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
int err, orig_mtu; |
|
|
|
if (new_mtu == dev->mtu) |
|
return 0; |
|
|
|
err = dev_validate_mtu(dev, new_mtu, extack); |
|
if (err) |
|
return err; |
|
|
|
if (!netif_device_present(dev)) |
|
return -ENODEV; |
|
|
|
err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev); |
|
err = notifier_to_errno(err); |
|
if (err) |
|
return err; |
|
|
|
orig_mtu = dev->mtu; |
|
err = __dev_set_mtu(dev, new_mtu); |
|
|
|
if (!err) { |
|
err = call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev, |
|
orig_mtu); |
|
err = notifier_to_errno(err); |
|
if (err) { |
|
/* setting mtu back and notifying everyone again, |
|
* so that they have a chance to revert changes. |
|
*/ |
|
__dev_set_mtu(dev, orig_mtu); |
|
call_netdevice_notifiers_mtu(NETDEV_CHANGEMTU, dev, |
|
new_mtu); |
|
} |
|
} |
|
return err; |
|
} |
|
|
|
int dev_set_mtu(struct net_device *dev, int new_mtu) |
|
{ |
|
struct netlink_ext_ack extack; |
|
int err; |
|
|
|
memset(&extack, 0, sizeof(extack)); |
|
err = dev_set_mtu_ext(dev, new_mtu, &extack); |
|
if (err && extack._msg) |
|
net_err_ratelimited("%s: %s\n", dev->name, extack._msg); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(dev_set_mtu); |
|
|
|
/** |
|
* dev_change_tx_queue_len - Change TX queue length of a netdevice |
|
* @dev: device |
|
* @new_len: new tx queue length |
|
*/ |
|
int dev_change_tx_queue_len(struct net_device *dev, unsigned long new_len) |
|
{ |
|
unsigned int orig_len = dev->tx_queue_len; |
|
int res; |
|
|
|
if (new_len != (unsigned int)new_len) |
|
return -ERANGE; |
|
|
|
if (new_len != orig_len) { |
|
dev->tx_queue_len = new_len; |
|
res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev); |
|
res = notifier_to_errno(res); |
|
if (res) |
|
goto err_rollback; |
|
res = dev_qdisc_change_tx_queue_len(dev); |
|
if (res) |
|
goto err_rollback; |
|
} |
|
|
|
return 0; |
|
|
|
err_rollback: |
|
netdev_err(dev, "refused to change device tx_queue_len\n"); |
|
dev->tx_queue_len = orig_len; |
|
return res; |
|
} |
|
|
|
/** |
|
* dev_set_group - Change group this device belongs to |
|
* @dev: device |
|
* @new_group: group this device should belong to |
|
*/ |
|
void dev_set_group(struct net_device *dev, int new_group) |
|
{ |
|
dev->group = new_group; |
|
} |
|
|
|
/** |
|
* dev_pre_changeaddr_notify - Call NETDEV_PRE_CHANGEADDR. |
|
* @dev: device |
|
* @addr: new address |
|
* @extack: netlink extended ack |
|
*/ |
|
int dev_pre_changeaddr_notify(struct net_device *dev, const char *addr, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct netdev_notifier_pre_changeaddr_info info = { |
|
.info.dev = dev, |
|
.info.extack = extack, |
|
.dev_addr = addr, |
|
}; |
|
int rc; |
|
|
|
rc = call_netdevice_notifiers_info(NETDEV_PRE_CHANGEADDR, &info.info); |
|
return notifier_to_errno(rc); |
|
} |
|
EXPORT_SYMBOL(dev_pre_changeaddr_notify); |
|
|
|
/** |
|
* dev_set_mac_address - Change Media Access Control Address |
|
* @dev: device |
|
* @sa: new address |
|
* @extack: netlink extended ack |
|
* |
|
* Change the hardware (MAC) address of the device |
|
*/ |
|
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
int err; |
|
|
|
if (!ops->ndo_set_mac_address) |
|
return -EOPNOTSUPP; |
|
if (sa->sa_family != dev->type) |
|
return -EINVAL; |
|
if (!netif_device_present(dev)) |
|
return -ENODEV; |
|
err = dev_pre_changeaddr_notify(dev, sa->sa_data, extack); |
|
if (err) |
|
return err; |
|
err = ops->ndo_set_mac_address(dev, sa); |
|
if (err) |
|
return err; |
|
dev->addr_assign_type = NET_ADDR_SET; |
|
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
|
add_device_randomness(dev->dev_addr, dev->addr_len); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(dev_set_mac_address); |
|
|
|
static DECLARE_RWSEM(dev_addr_sem); |
|
|
|
int dev_set_mac_address_user(struct net_device *dev, struct sockaddr *sa, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
int ret; |
|
|
|
down_write(&dev_addr_sem); |
|
ret = dev_set_mac_address(dev, sa, extack); |
|
up_write(&dev_addr_sem); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(dev_set_mac_address_user); |
|
|
|
int dev_get_mac_address(struct sockaddr *sa, struct net *net, char *dev_name) |
|
{ |
|
size_t size = sizeof(sa->sa_data); |
|
struct net_device *dev; |
|
int ret = 0; |
|
|
|
down_read(&dev_addr_sem); |
|
rcu_read_lock(); |
|
|
|
dev = dev_get_by_name_rcu(net, dev_name); |
|
if (!dev) { |
|
ret = -ENODEV; |
|
goto unlock; |
|
} |
|
if (!dev->addr_len) |
|
memset(sa->sa_data, 0, size); |
|
else |
|
memcpy(sa->sa_data, dev->dev_addr, |
|
min_t(size_t, size, dev->addr_len)); |
|
sa->sa_family = dev->type; |
|
|
|
unlock: |
|
rcu_read_unlock(); |
|
up_read(&dev_addr_sem); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(dev_get_mac_address); |
|
|
|
/** |
|
* dev_change_carrier - Change device carrier |
|
* @dev: device |
|
* @new_carrier: new value |
|
* |
|
* Change device carrier |
|
*/ |
|
int dev_change_carrier(struct net_device *dev, bool new_carrier) |
|
{ |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
|
|
if (!ops->ndo_change_carrier) |
|
return -EOPNOTSUPP; |
|
if (!netif_device_present(dev)) |
|
return -ENODEV; |
|
return ops->ndo_change_carrier(dev, new_carrier); |
|
} |
|
|
|
/** |
|
* dev_get_phys_port_id - Get device physical port ID |
|
* @dev: device |
|
* @ppid: port ID |
|
* |
|
* Get device physical port ID |
|
*/ |
|
int dev_get_phys_port_id(struct net_device *dev, |
|
struct netdev_phys_item_id *ppid) |
|
{ |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
|
|
if (!ops->ndo_get_phys_port_id) |
|
return -EOPNOTSUPP; |
|
return ops->ndo_get_phys_port_id(dev, ppid); |
|
} |
|
|
|
/** |
|
* dev_get_phys_port_name - Get device physical port name |
|
* @dev: device |
|
* @name: port name |
|
* @len: limit of bytes to copy to name |
|
* |
|
* Get device physical port name |
|
*/ |
|
int dev_get_phys_port_name(struct net_device *dev, |
|
char *name, size_t len) |
|
{ |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
int err; |
|
|
|
if (ops->ndo_get_phys_port_name) { |
|
err = ops->ndo_get_phys_port_name(dev, name, len); |
|
if (err != -EOPNOTSUPP) |
|
return err; |
|
} |
|
return devlink_compat_phys_port_name_get(dev, name, len); |
|
} |
|
|
|
/** |
|
* dev_get_port_parent_id - Get the device's port parent identifier |
|
* @dev: network device |
|
* @ppid: pointer to a storage for the port's parent identifier |
|
* @recurse: allow/disallow recursion to lower devices |
|
* |
|
* Get the devices's port parent identifier |
|
*/ |
|
int dev_get_port_parent_id(struct net_device *dev, |
|
struct netdev_phys_item_id *ppid, |
|
bool recurse) |
|
{ |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
struct netdev_phys_item_id first = { }; |
|
struct net_device *lower_dev; |
|
struct list_head *iter; |
|
int err; |
|
|
|
if (ops->ndo_get_port_parent_id) { |
|
err = ops->ndo_get_port_parent_id(dev, ppid); |
|
if (err != -EOPNOTSUPP) |
|
return err; |
|
} |
|
|
|
err = devlink_compat_switch_id_get(dev, ppid); |
|
if (!recurse || err != -EOPNOTSUPP) |
|
return err; |
|
|
|
netdev_for_each_lower_dev(dev, lower_dev, iter) { |
|
err = dev_get_port_parent_id(lower_dev, ppid, true); |
|
if (err) |
|
break; |
|
if (!first.id_len) |
|
first = *ppid; |
|
else if (memcmp(&first, ppid, sizeof(*ppid))) |
|
return -EOPNOTSUPP; |
|
} |
|
|
|
return err; |
|
} |
|
EXPORT_SYMBOL(dev_get_port_parent_id); |
|
|
|
/** |
|
* netdev_port_same_parent_id - Indicate if two network devices have |
|
* the same port parent identifier |
|
* @a: first network device |
|
* @b: second network device |
|
*/ |
|
bool netdev_port_same_parent_id(struct net_device *a, struct net_device *b) |
|
{ |
|
struct netdev_phys_item_id a_id = { }; |
|
struct netdev_phys_item_id b_id = { }; |
|
|
|
if (dev_get_port_parent_id(a, &a_id, true) || |
|
dev_get_port_parent_id(b, &b_id, true)) |
|
return false; |
|
|
|
return netdev_phys_item_id_same(&a_id, &b_id); |
|
} |
|
EXPORT_SYMBOL(netdev_port_same_parent_id); |
|
|
|
/** |
|
* dev_change_proto_down - set carrier according to proto_down. |
|
* |
|
* @dev: device |
|
* @proto_down: new value |
|
*/ |
|
int dev_change_proto_down(struct net_device *dev, bool proto_down) |
|
{ |
|
if (!(dev->priv_flags & IFF_CHANGE_PROTO_DOWN)) |
|
return -EOPNOTSUPP; |
|
if (!netif_device_present(dev)) |
|
return -ENODEV; |
|
if (proto_down) |
|
netif_carrier_off(dev); |
|
else |
|
netif_carrier_on(dev); |
|
dev->proto_down = proto_down; |
|
return 0; |
|
} |
|
|
|
/** |
|
* dev_change_proto_down_reason - proto down reason |
|
* |
|
* @dev: device |
|
* @mask: proto down mask |
|
* @value: proto down value |
|
*/ |
|
void dev_change_proto_down_reason(struct net_device *dev, unsigned long mask, |
|
u32 value) |
|
{ |
|
int b; |
|
|
|
if (!mask) { |
|
dev->proto_down_reason = value; |
|
} else { |
|
for_each_set_bit(b, &mask, 32) { |
|
if (value & (1 << b)) |
|
dev->proto_down_reason |= BIT(b); |
|
else |
|
dev->proto_down_reason &= ~BIT(b); |
|
} |
|
} |
|
} |
|
|
|
struct bpf_xdp_link { |
|
struct bpf_link link; |
|
struct net_device *dev; /* protected by rtnl_lock, no refcnt held */ |
|
int flags; |
|
}; |
|
|
|
static enum bpf_xdp_mode dev_xdp_mode(struct net_device *dev, u32 flags) |
|
{ |
|
if (flags & XDP_FLAGS_HW_MODE) |
|
return XDP_MODE_HW; |
|
if (flags & XDP_FLAGS_DRV_MODE) |
|
return XDP_MODE_DRV; |
|
if (flags & XDP_FLAGS_SKB_MODE) |
|
return XDP_MODE_SKB; |
|
return dev->netdev_ops->ndo_bpf ? XDP_MODE_DRV : XDP_MODE_SKB; |
|
} |
|
|
|
static bpf_op_t dev_xdp_bpf_op(struct net_device *dev, enum bpf_xdp_mode mode) |
|
{ |
|
switch (mode) { |
|
case XDP_MODE_SKB: |
|
return generic_xdp_install; |
|
case XDP_MODE_DRV: |
|
case XDP_MODE_HW: |
|
return dev->netdev_ops->ndo_bpf; |
|
default: |
|
return NULL; |
|
} |
|
} |
|
|
|
static struct bpf_xdp_link *dev_xdp_link(struct net_device *dev, |
|
enum bpf_xdp_mode mode) |
|
{ |
|
return dev->xdp_state[mode].link; |
|
} |
|
|
|
static struct bpf_prog *dev_xdp_prog(struct net_device *dev, |
|
enum bpf_xdp_mode mode) |
|
{ |
|
struct bpf_xdp_link *link = dev_xdp_link(dev, mode); |
|
|
|
if (link) |
|
return link->link.prog; |
|
return dev->xdp_state[mode].prog; |
|
} |
|
|
|
u8 dev_xdp_prog_count(struct net_device *dev) |
|
{ |
|
u8 count = 0; |
|
int i; |
|
|
|
for (i = 0; i < __MAX_XDP_MODE; i++) |
|
if (dev->xdp_state[i].prog || dev->xdp_state[i].link) |
|
count++; |
|
return count; |
|
} |
|
EXPORT_SYMBOL_GPL(dev_xdp_prog_count); |
|
|
|
u32 dev_xdp_prog_id(struct net_device *dev, enum bpf_xdp_mode mode) |
|
{ |
|
struct bpf_prog *prog = dev_xdp_prog(dev, mode); |
|
|
|
return prog ? prog->aux->id : 0; |
|
} |
|
|
|
static void dev_xdp_set_link(struct net_device *dev, enum bpf_xdp_mode mode, |
|
struct bpf_xdp_link *link) |
|
{ |
|
dev->xdp_state[mode].link = link; |
|
dev->xdp_state[mode].prog = NULL; |
|
} |
|
|
|
static void dev_xdp_set_prog(struct net_device *dev, enum bpf_xdp_mode mode, |
|
struct bpf_prog *prog) |
|
{ |
|
dev->xdp_state[mode].link = NULL; |
|
dev->xdp_state[mode].prog = prog; |
|
} |
|
|
|
static int dev_xdp_install(struct net_device *dev, enum bpf_xdp_mode mode, |
|
bpf_op_t bpf_op, struct netlink_ext_ack *extack, |
|
u32 flags, struct bpf_prog *prog) |
|
{ |
|
struct netdev_bpf xdp; |
|
int err; |
|
|
|
memset(&xdp, 0, sizeof(xdp)); |
|
xdp.command = mode == XDP_MODE_HW ? XDP_SETUP_PROG_HW : XDP_SETUP_PROG; |
|
xdp.extack = extack; |
|
xdp.flags = flags; |
|
xdp.prog = prog; |
|
|
|
/* Drivers assume refcnt is already incremented (i.e, prog pointer is |
|
* "moved" into driver), so they don't increment it on their own, but |
|
* they do decrement refcnt when program is detached or replaced. |
|
* Given net_device also owns link/prog, we need to bump refcnt here |
|
* to prevent drivers from underflowing it. |
|
*/ |
|
if (prog) |
|
bpf_prog_inc(prog); |
|
err = bpf_op(dev, &xdp); |
|
if (err) { |
|
if (prog) |
|
bpf_prog_put(prog); |
|
return err; |
|
} |
|
|
|
if (mode != XDP_MODE_HW) |
|
bpf_prog_change_xdp(dev_xdp_prog(dev, mode), prog); |
|
|
|
return 0; |
|
} |
|
|
|
static void dev_xdp_uninstall(struct net_device *dev) |
|
{ |
|
struct bpf_xdp_link *link; |
|
struct bpf_prog *prog; |
|
enum bpf_xdp_mode mode; |
|
bpf_op_t bpf_op; |
|
|
|
ASSERT_RTNL(); |
|
|
|
for (mode = XDP_MODE_SKB; mode < __MAX_XDP_MODE; mode++) { |
|
prog = dev_xdp_prog(dev, mode); |
|
if (!prog) |
|
continue; |
|
|
|
bpf_op = dev_xdp_bpf_op(dev, mode); |
|
if (!bpf_op) |
|
continue; |
|
|
|
WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL)); |
|
|
|
/* auto-detach link from net device */ |
|
link = dev_xdp_link(dev, mode); |
|
if (link) |
|
link->dev = NULL; |
|
else |
|
bpf_prog_put(prog); |
|
|
|
dev_xdp_set_link(dev, mode, NULL); |
|
} |
|
} |
|
|
|
static int dev_xdp_attach(struct net_device *dev, struct netlink_ext_ack *extack, |
|
struct bpf_xdp_link *link, struct bpf_prog *new_prog, |
|
struct bpf_prog *old_prog, u32 flags) |
|
{ |
|
unsigned int num_modes = hweight32(flags & XDP_FLAGS_MODES); |
|
struct bpf_prog *cur_prog; |
|
struct net_device *upper; |
|
struct list_head *iter; |
|
enum bpf_xdp_mode mode; |
|
bpf_op_t bpf_op; |
|
int err; |
|
|
|
ASSERT_RTNL(); |
|
|
|
/* either link or prog attachment, never both */ |
|
if (link && (new_prog || old_prog)) |
|
return -EINVAL; |
|
/* link supports only XDP mode flags */ |
|
if (link && (flags & ~XDP_FLAGS_MODES)) { |
|
NL_SET_ERR_MSG(extack, "Invalid XDP flags for BPF link attachment"); |
|
return -EINVAL; |
|
} |
|
/* just one XDP mode bit should be set, zero defaults to drv/skb mode */ |
|
if (num_modes > 1) { |
|
NL_SET_ERR_MSG(extack, "Only one XDP mode flag can be set"); |
|
return -EINVAL; |
|
} |
|
/* avoid ambiguity if offload + drv/skb mode progs are both loaded */ |
|
if (!num_modes && dev_xdp_prog_count(dev) > 1) { |
|
NL_SET_ERR_MSG(extack, |
|
"More than one program loaded, unset mode is ambiguous"); |
|
return -EINVAL; |
|
} |
|
/* old_prog != NULL implies XDP_FLAGS_REPLACE is set */ |
|
if (old_prog && !(flags & XDP_FLAGS_REPLACE)) { |
|
NL_SET_ERR_MSG(extack, "XDP_FLAGS_REPLACE is not specified"); |
|
return -EINVAL; |
|
} |
|
|
|
mode = dev_xdp_mode(dev, flags); |
|
/* can't replace attached link */ |
|
if (dev_xdp_link(dev, mode)) { |
|
NL_SET_ERR_MSG(extack, "Can't replace active BPF XDP link"); |
|
return -EBUSY; |
|
} |
|
|
|
/* don't allow if an upper device already has a program */ |
|
netdev_for_each_upper_dev_rcu(dev, upper, iter) { |
|
if (dev_xdp_prog_count(upper) > 0) { |
|
NL_SET_ERR_MSG(extack, "Cannot attach when an upper device already has a program"); |
|
return -EEXIST; |
|
} |
|
} |
|
|
|
cur_prog = dev_xdp_prog(dev, mode); |
|
/* can't replace attached prog with link */ |
|
if (link && cur_prog) { |
|
NL_SET_ERR_MSG(extack, "Can't replace active XDP program with BPF link"); |
|
return -EBUSY; |
|
} |
|
if ((flags & XDP_FLAGS_REPLACE) && cur_prog != old_prog) { |
|
NL_SET_ERR_MSG(extack, "Active program does not match expected"); |
|
return -EEXIST; |
|
} |
|
|
|
/* put effective new program into new_prog */ |
|
if (link) |
|
new_prog = link->link.prog; |
|
|
|
if (new_prog) { |
|
bool offload = mode == XDP_MODE_HW; |
|
enum bpf_xdp_mode other_mode = mode == XDP_MODE_SKB |
|
? XDP_MODE_DRV : XDP_MODE_SKB; |
|
|
|
if ((flags & XDP_FLAGS_UPDATE_IF_NOEXIST) && cur_prog) { |
|
NL_SET_ERR_MSG(extack, "XDP program already attached"); |
|
return -EBUSY; |
|
} |
|
if (!offload && dev_xdp_prog(dev, other_mode)) { |
|
NL_SET_ERR_MSG(extack, "Native and generic XDP can't be active at the same time"); |
|
return -EEXIST; |
|
} |
|
if (!offload && bpf_prog_is_dev_bound(new_prog->aux)) { |
|
NL_SET_ERR_MSG(extack, "Using device-bound program without HW_MODE flag is not supported"); |
|
return -EINVAL; |
|
} |
|
if (new_prog->expected_attach_type == BPF_XDP_DEVMAP) { |
|
NL_SET_ERR_MSG(extack, "BPF_XDP_DEVMAP programs can not be attached to a device"); |
|
return -EINVAL; |
|
} |
|
if (new_prog->expected_attach_type == BPF_XDP_CPUMAP) { |
|
NL_SET_ERR_MSG(extack, "BPF_XDP_CPUMAP programs can not be attached to a device"); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
/* don't call drivers if the effective program didn't change */ |
|
if (new_prog != cur_prog) { |
|
bpf_op = dev_xdp_bpf_op(dev, mode); |
|
if (!bpf_op) { |
|
NL_SET_ERR_MSG(extack, "Underlying driver does not support XDP in native mode"); |
|
return -EOPNOTSUPP; |
|
} |
|
|
|
err = dev_xdp_install(dev, mode, bpf_op, extack, flags, new_prog); |
|
if (err) |
|
return err; |
|
} |
|
|
|
if (link) |
|
dev_xdp_set_link(dev, mode, link); |
|
else |
|
dev_xdp_set_prog(dev, mode, new_prog); |
|
if (cur_prog) |
|
bpf_prog_put(cur_prog); |
|
|
|
return 0; |
|
} |
|
|
|
static int dev_xdp_attach_link(struct net_device *dev, |
|
struct netlink_ext_ack *extack, |
|
struct bpf_xdp_link *link) |
|
{ |
|
return dev_xdp_attach(dev, extack, link, NULL, NULL, link->flags); |
|
} |
|
|
|
static int dev_xdp_detach_link(struct net_device *dev, |
|
struct netlink_ext_ack *extack, |
|
struct bpf_xdp_link *link) |
|
{ |
|
enum bpf_xdp_mode mode; |
|
bpf_op_t bpf_op; |
|
|
|
ASSERT_RTNL(); |
|
|
|
mode = dev_xdp_mode(dev, link->flags); |
|
if (dev_xdp_link(dev, mode) != link) |
|
return -EINVAL; |
|
|
|
bpf_op = dev_xdp_bpf_op(dev, mode); |
|
WARN_ON(dev_xdp_install(dev, mode, bpf_op, NULL, 0, NULL)); |
|
dev_xdp_set_link(dev, mode, NULL); |
|
return 0; |
|
} |
|
|
|
static void bpf_xdp_link_release(struct bpf_link *link) |
|
{ |
|
struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); |
|
|
|
rtnl_lock(); |
|
|
|
/* if racing with net_device's tear down, xdp_link->dev might be |
|
* already NULL, in which case link was already auto-detached |
|
*/ |
|
if (xdp_link->dev) { |
|
WARN_ON(dev_xdp_detach_link(xdp_link->dev, NULL, xdp_link)); |
|
xdp_link->dev = NULL; |
|
} |
|
|
|
rtnl_unlock(); |
|
} |
|
|
|
static int bpf_xdp_link_detach(struct bpf_link *link) |
|
{ |
|
bpf_xdp_link_release(link); |
|
return 0; |
|
} |
|
|
|
static void bpf_xdp_link_dealloc(struct bpf_link *link) |
|
{ |
|
struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); |
|
|
|
kfree(xdp_link); |
|
} |
|
|
|
static void bpf_xdp_link_show_fdinfo(const struct bpf_link *link, |
|
struct seq_file *seq) |
|
{ |
|
struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); |
|
u32 ifindex = 0; |
|
|
|
rtnl_lock(); |
|
if (xdp_link->dev) |
|
ifindex = xdp_link->dev->ifindex; |
|
rtnl_unlock(); |
|
|
|
seq_printf(seq, "ifindex:\t%u\n", ifindex); |
|
} |
|
|
|
static int bpf_xdp_link_fill_link_info(const struct bpf_link *link, |
|
struct bpf_link_info *info) |
|
{ |
|
struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); |
|
u32 ifindex = 0; |
|
|
|
rtnl_lock(); |
|
if (xdp_link->dev) |
|
ifindex = xdp_link->dev->ifindex; |
|
rtnl_unlock(); |
|
|
|
info->xdp.ifindex = ifindex; |
|
return 0; |
|
} |
|
|
|
static int bpf_xdp_link_update(struct bpf_link *link, struct bpf_prog *new_prog, |
|
struct bpf_prog *old_prog) |
|
{ |
|
struct bpf_xdp_link *xdp_link = container_of(link, struct bpf_xdp_link, link); |
|
enum bpf_xdp_mode mode; |
|
bpf_op_t bpf_op; |
|
int err = 0; |
|
|
|
rtnl_lock(); |
|
|
|
/* link might have been auto-released already, so fail */ |
|
if (!xdp_link->dev) { |
|
err = -ENOLINK; |
|
goto out_unlock; |
|
} |
|
|
|
if (old_prog && link->prog != old_prog) { |
|
err = -EPERM; |
|
goto out_unlock; |
|
} |
|
old_prog = link->prog; |
|
if (old_prog->type != new_prog->type || |
|
old_prog->expected_attach_type != new_prog->expected_attach_type) { |
|
err = -EINVAL; |
|
goto out_unlock; |
|
} |
|
|
|
if (old_prog == new_prog) { |
|
/* no-op, don't disturb drivers */ |
|
bpf_prog_put(new_prog); |
|
goto out_unlock; |
|
} |
|
|
|
mode = dev_xdp_mode(xdp_link->dev, xdp_link->flags); |
|
bpf_op = dev_xdp_bpf_op(xdp_link->dev, mode); |
|
err = dev_xdp_install(xdp_link->dev, mode, bpf_op, NULL, |
|
xdp_link->flags, new_prog); |
|
if (err) |
|
goto out_unlock; |
|
|
|
old_prog = xchg(&link->prog, new_prog); |
|
bpf_prog_put(old_prog); |
|
|
|
out_unlock: |
|
rtnl_unlock(); |
|
return err; |
|
} |
|
|
|
static const struct bpf_link_ops bpf_xdp_link_lops = { |
|
.release = bpf_xdp_link_release, |
|
.dealloc = bpf_xdp_link_dealloc, |
|
.detach = bpf_xdp_link_detach, |
|
.show_fdinfo = bpf_xdp_link_show_fdinfo, |
|
.fill_link_info = bpf_xdp_link_fill_link_info, |
|
.update_prog = bpf_xdp_link_update, |
|
}; |
|
|
|
int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) |
|
{ |
|
struct net *net = current->nsproxy->net_ns; |
|
struct bpf_link_primer link_primer; |
|
struct bpf_xdp_link *link; |
|
struct net_device *dev; |
|
int err, fd; |
|
|
|
rtnl_lock(); |
|
dev = dev_get_by_index(net, attr->link_create.target_ifindex); |
|
if (!dev) { |
|
rtnl_unlock(); |
|
return -EINVAL; |
|
} |
|
|
|
link = kzalloc(sizeof(*link), GFP_USER); |
|
if (!link) { |
|
err = -ENOMEM; |
|
goto unlock; |
|
} |
|
|
|
bpf_link_init(&link->link, BPF_LINK_TYPE_XDP, &bpf_xdp_link_lops, prog); |
|
link->dev = dev; |
|
link->flags = attr->link_create.flags; |
|
|
|
err = bpf_link_prime(&link->link, &link_primer); |
|
if (err) { |
|
kfree(link); |
|
goto unlock; |
|
} |
|
|
|
err = dev_xdp_attach_link(dev, NULL, link); |
|
rtnl_unlock(); |
|
|
|
if (err) { |
|
link->dev = NULL; |
|
bpf_link_cleanup(&link_primer); |
|
goto out_put_dev; |
|
} |
|
|
|
fd = bpf_link_settle(&link_primer); |
|
/* link itself doesn't hold dev's refcnt to not complicate shutdown */ |
|
dev_put(dev); |
|
return fd; |
|
|
|
unlock: |
|
rtnl_unlock(); |
|
|
|
out_put_dev: |
|
dev_put(dev); |
|
return err; |
|
} |
|
|
|
/** |
|
* dev_change_xdp_fd - set or clear a bpf program for a device rx path |
|
* @dev: device |
|
* @extack: netlink extended ack |
|
* @fd: new program fd or negative value to clear |
|
* @expected_fd: old program fd that userspace expects to replace or clear |
|
* @flags: xdp-related flags |
|
* |
|
* Set or clear a bpf program for a device |
|
*/ |
|
int dev_change_xdp_fd(struct net_device *dev, struct netlink_ext_ack *extack, |
|
int fd, int expected_fd, u32 flags) |
|
{ |
|
enum bpf_xdp_mode mode = dev_xdp_mode(dev, flags); |
|
struct bpf_prog *new_prog = NULL, *old_prog = NULL; |
|
int err; |
|
|
|
ASSERT_RTNL(); |
|
|
|
if (fd >= 0) { |
|
new_prog = bpf_prog_get_type_dev(fd, BPF_PROG_TYPE_XDP, |
|
mode != XDP_MODE_SKB); |
|
if (IS_ERR(new_prog)) |
|
return PTR_ERR(new_prog); |
|
} |
|
|
|
if (expected_fd >= 0) { |
|
old_prog = bpf_prog_get_type_dev(expected_fd, BPF_PROG_TYPE_XDP, |
|
mode != XDP_MODE_SKB); |
|
if (IS_ERR(old_prog)) { |
|
err = PTR_ERR(old_prog); |
|
old_prog = NULL; |
|
goto err_out; |
|
} |
|
} |
|
|
|
err = dev_xdp_attach(dev, extack, NULL, new_prog, old_prog, flags); |
|
|
|
err_out: |
|
if (err && new_prog) |
|
bpf_prog_put(new_prog); |
|
if (old_prog) |
|
bpf_prog_put(old_prog); |
|
return err; |
|
} |
|
|
|
/** |
|
* dev_new_index - allocate an ifindex |
|
* @net: the applicable net namespace |
|
* |
|
* Returns a suitable unique value for a new device interface |
|
* number. The caller must hold the rtnl semaphore or the |
|
* dev_base_lock to be sure it remains unique. |
|
*/ |
|
static int dev_new_index(struct net *net) |
|
{ |
|
int ifindex = net->ifindex; |
|
|
|
for (;;) { |
|
if (++ifindex <= 0) |
|
ifindex = 1; |
|
if (!__dev_get_by_index(net, ifindex)) |
|
return net->ifindex = ifindex; |
|
} |
|
} |
|
|
|
/* Delayed registration/unregisteration */ |
|
LIST_HEAD(net_todo_list); |
|
DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq); |
|
|
|
static void net_set_todo(struct net_device *dev) |
|
{ |
|
list_add_tail(&dev->todo_list, &net_todo_list); |
|
atomic_inc(&dev_net(dev)->dev_unreg_count); |
|
} |
|
|
|
static netdev_features_t netdev_sync_upper_features(struct net_device *lower, |
|
struct net_device *upper, netdev_features_t features) |
|
{ |
|
netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; |
|
netdev_features_t feature; |
|
int feature_bit; |
|
|
|
for_each_netdev_feature(upper_disables, feature_bit) { |
|
feature = __NETIF_F_BIT(feature_bit); |
|
if (!(upper->wanted_features & feature) |
|
&& (features & feature)) { |
|
netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n", |
|
&feature, upper->name); |
|
features &= ~feature; |
|
} |
|
} |
|
|
|
return features; |
|
} |
|
|
|
static void netdev_sync_lower_features(struct net_device *upper, |
|
struct net_device *lower, netdev_features_t features) |
|
{ |
|
netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES; |
|
netdev_features_t feature; |
|
int feature_bit; |
|
|
|
for_each_netdev_feature(upper_disables, feature_bit) { |
|
feature = __NETIF_F_BIT(feature_bit); |
|
if (!(features & feature) && (lower->features & feature)) { |
|
netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n", |
|
&feature, lower->name); |
|
lower->wanted_features &= ~feature; |
|
__netdev_update_features(lower); |
|
|
|
if (unlikely(lower->features & feature)) |
|
netdev_WARN(upper, "failed to disable %pNF on %s!\n", |
|
&feature, lower->name); |
|
else |
|
netdev_features_change(lower); |
|
} |
|
} |
|
} |
|
|
|
static netdev_features_t netdev_fix_features(struct net_device *dev, |
|
netdev_features_t features) |
|
{ |
|
/* Fix illegal checksum combinations */ |
|
if ((features & NETIF_F_HW_CSUM) && |
|
(features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { |
|
netdev_warn(dev, "mixed HW and IP checksum settings.\n"); |
|
features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); |
|
} |
|
|
|
/* TSO requires that SG is present as well. */ |
|
if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) { |
|
netdev_dbg(dev, "Dropping TSO features since no SG feature.\n"); |
|
features &= ~NETIF_F_ALL_TSO; |
|
} |
|
|
|
if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) && |
|
!(features & NETIF_F_IP_CSUM)) { |
|
netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n"); |
|
features &= ~NETIF_F_TSO; |
|
features &= ~NETIF_F_TSO_ECN; |
|
} |
|
|
|
if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) && |
|
!(features & NETIF_F_IPV6_CSUM)) { |
|
netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n"); |
|
features &= ~NETIF_F_TSO6; |
|
} |
|
|
|
/* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */ |
|
if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO)) |
|
features &= ~NETIF_F_TSO_MANGLEID; |
|
|
|
/* TSO ECN requires that TSO is present as well. */ |
|
if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN) |
|
features &= ~NETIF_F_TSO_ECN; |
|
|
|
/* Software GSO depends on SG. */ |
|
if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) { |
|
netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n"); |
|
features &= ~NETIF_F_GSO; |
|
} |
|
|
|
/* GSO partial features require GSO partial be set */ |
|
if ((features & dev->gso_partial_features) && |
|
!(features & NETIF_F_GSO_PARTIAL)) { |
|
netdev_dbg(dev, |
|
"Dropping partially supported GSO features since no GSO partial.\n"); |
|
features &= ~dev->gso_partial_features; |
|
} |
|
|
|
if (!(features & NETIF_F_RXCSUM)) { |
|
/* NETIF_F_GRO_HW implies doing RXCSUM since every packet |
|
* successfully merged by hardware must also have the |
|
* checksum verified by hardware. If the user does not |
|
* want to enable RXCSUM, logically, we should disable GRO_HW. |
|
*/ |
|
if (features & NETIF_F_GRO_HW) { |
|
netdev_dbg(dev, "Dropping NETIF_F_GRO_HW since no RXCSUM feature.\n"); |
|
features &= ~NETIF_F_GRO_HW; |
|
} |
|
} |
|
|
|
/* LRO/HW-GRO features cannot be combined with RX-FCS */ |
|
if (features & NETIF_F_RXFCS) { |
|
if (features & NETIF_F_LRO) { |
|
netdev_dbg(dev, "Dropping LRO feature since RX-FCS is requested.\n"); |
|
features &= ~NETIF_F_LRO; |
|
} |
|
|
|
if (features & NETIF_F_GRO_HW) { |
|
netdev_dbg(dev, "Dropping HW-GRO feature since RX-FCS is requested.\n"); |
|
features &= ~NETIF_F_GRO_HW; |
|
} |
|
} |
|
|
|
if ((features & NETIF_F_GRO_HW) && (features & NETIF_F_LRO)) { |
|
netdev_dbg(dev, "Dropping LRO feature since HW-GRO is requested.\n"); |
|
features &= ~NETIF_F_LRO; |
|
} |
|
|
|
if (features & NETIF_F_HW_TLS_TX) { |
|
bool ip_csum = (features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) == |
|
(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM); |
|
bool hw_csum = features & NETIF_F_HW_CSUM; |
|
|
|
if (!ip_csum && !hw_csum) { |
|
netdev_dbg(dev, "Dropping TLS TX HW offload feature since no CSUM feature.\n"); |
|
features &= ~NETIF_F_HW_TLS_TX; |
|
} |
|
} |
|
|
|
if ((features & NETIF_F_HW_TLS_RX) && !(features & NETIF_F_RXCSUM)) { |
|
netdev_dbg(dev, "Dropping TLS RX HW offload feature since no RXCSUM feature.\n"); |
|
features &= ~NETIF_F_HW_TLS_RX; |
|
} |
|
|
|
return features; |
|
} |
|
|
|
int __netdev_update_features(struct net_device *dev) |
|
{ |
|
struct net_device *upper, *lower; |
|
netdev_features_t features; |
|
struct list_head *iter; |
|
int err = -1; |
|
|
|
ASSERT_RTNL(); |
|
|
|
features = netdev_get_wanted_features(dev); |
|
|
|
if (dev->netdev_ops->ndo_fix_features) |
|
features = dev->netdev_ops->ndo_fix_features(dev, features); |
|
|
|
/* driver might be less strict about feature dependencies */ |
|
features = netdev_fix_features(dev, features); |
|
|
|
/* some features can't be enabled if they're off on an upper device */ |
|
netdev_for_each_upper_dev_rcu(dev, upper, iter) |
|
features = netdev_sync_upper_features(dev, upper, features); |
|
|
|
if (dev->features == features) |
|
goto sync_lower; |
|
|
|
netdev_dbg(dev, "Features changed: %pNF -> %pNF\n", |
|
&dev->features, &features); |
|
|
|
if (dev->netdev_ops->ndo_set_features) |
|
err = dev->netdev_ops->ndo_set_features(dev, features); |
|
else |
|
err = 0; |
|
|
|
if (unlikely(err < 0)) { |
|
netdev_err(dev, |
|
"set_features() failed (%d); wanted %pNF, left %pNF\n", |
|
err, &features, &dev->features); |
|
/* return non-0 since some features might have changed and |
|
* it's better to fire a spurious notification than miss it |
|
*/ |
|
return -1; |
|
} |
|
|
|
sync_lower: |
|
/* some features must be disabled on lower devices when disabled |
|
* on an upper device (think: bonding master or bridge) |
|
*/ |
|
netdev_for_each_lower_dev(dev, lower, iter) |
|
netdev_sync_lower_features(dev, lower, features); |
|
|
|
if (!err) { |
|
netdev_features_t diff = features ^ dev->features; |
|
|
|
if (diff & NETIF_F_RX_UDP_TUNNEL_PORT) { |
|
/* udp_tunnel_{get,drop}_rx_info both need |
|
* NETIF_F_RX_UDP_TUNNEL_PORT enabled on the |
|
* device, or they won't do anything. |
|
* Thus we need to update dev->features |
|
* *before* calling udp_tunnel_get_rx_info, |
|
* but *after* calling udp_tunnel_drop_rx_info. |
|
*/ |
|
if (features & NETIF_F_RX_UDP_TUNNEL_PORT) { |
|
dev->features = features; |
|
udp_tunnel_get_rx_info(dev); |
|
} else { |
|
udp_tunnel_drop_rx_info(dev); |
|
} |
|
} |
|
|
|
if (diff & NETIF_F_HW_VLAN_CTAG_FILTER) { |
|
if (features & NETIF_F_HW_VLAN_CTAG_FILTER) { |
|
dev->features = features; |
|
err |= vlan_get_rx_ctag_filter_info(dev); |
|
} else { |
|
vlan_drop_rx_ctag_filter_info(dev); |
|
} |
|
} |
|
|
|
if (diff & NETIF_F_HW_VLAN_STAG_FILTER) { |
|
if (features & NETIF_F_HW_VLAN_STAG_FILTER) { |
|
dev->features = features; |
|
err |= vlan_get_rx_stag_filter_info(dev); |
|
} else { |
|
vlan_drop_rx_stag_filter_info(dev); |
|
} |
|
} |
|
|
|
dev->features = features; |
|
} |
|
|
|
return err < 0 ? 0 : 1; |
|
} |
|
|
|
/** |
|
* netdev_update_features - recalculate device features |
|
* @dev: the device to check |
|
* |
|
* Recalculate dev->features set and send notifications if it |
|
* has changed. Should be called after driver or hardware dependent |
|
* conditions might have changed that influence the features. |
|
*/ |
|
void netdev_update_features(struct net_device *dev) |
|
{ |
|
if (__netdev_update_features(dev)) |
|
netdev_features_change(dev); |
|
} |
|
EXPORT_SYMBOL(netdev_update_features); |
|
|
|
/** |
|
* netdev_change_features - recalculate device features |
|
* @dev: the device to check |
|
* |
|
* Recalculate dev->features set and send notifications even |
|
* if they have not changed. Should be called instead of |
|
* netdev_update_features() if also dev->vlan_features might |
|
* have changed to allow the changes to be propagated to stacked |
|
* VLAN devices. |
|
*/ |
|
void netdev_change_features(struct net_device *dev) |
|
{ |
|
__netdev_update_features(dev); |
|
netdev_features_change(dev); |
|
} |
|
EXPORT_SYMBOL(netdev_change_features); |
|
|
|
/** |
|
* netif_stacked_transfer_operstate - transfer operstate |
|
* @rootdev: the root or lower level device to transfer state from |
|
* @dev: the device to transfer operstate to |
|
* |
|
* Transfer operational state from root to device. This is normally |
|
* called when a stacking relationship exists between the root |
|
* device and the device(a leaf device). |
|
*/ |
|
void netif_stacked_transfer_operstate(const struct net_device *rootdev, |
|
struct net_device *dev) |
|
{ |
|
if (rootdev->operstate == IF_OPER_DORMANT) |
|
netif_dormant_on(dev); |
|
else |
|
netif_dormant_off(dev); |
|
|
|
if (rootdev->operstate == IF_OPER_TESTING) |
|
netif_testing_on(dev); |
|
else |
|
netif_testing_off(dev); |
|
|
|
if (netif_carrier_ok(rootdev)) |
|
netif_carrier_on(dev); |
|
else |
|
netif_carrier_off(dev); |
|
} |
|
EXPORT_SYMBOL(netif_stacked_transfer_operstate); |
|
|
|
static int netif_alloc_rx_queues(struct net_device *dev) |
|
{ |
|
unsigned int i, count = dev->num_rx_queues; |
|
struct netdev_rx_queue *rx; |
|
size_t sz = count * sizeof(*rx); |
|
int err = 0; |
|
|
|
BUG_ON(count < 1); |
|
|
|
rx = kvzalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); |
|
if (!rx) |
|
return -ENOMEM; |
|
|
|
dev->_rx = rx; |
|
|
|
for (i = 0; i < count; i++) { |
|
rx[i].dev = dev; |
|
|
|
/* XDP RX-queue setup */ |
|
err = xdp_rxq_info_reg(&rx[i].xdp_rxq, dev, i, 0); |
|
if (err < 0) |
|
goto err_rxq_info; |
|
} |
|
return 0; |
|
|
|
err_rxq_info: |
|
/* Rollback successful reg's and free other resources */ |
|
while (i--) |
|
xdp_rxq_info_unreg(&rx[i].xdp_rxq); |
|
kvfree(dev->_rx); |
|
dev->_rx = NULL; |
|
return err; |
|
} |
|
|
|
static void netif_free_rx_queues(struct net_device *dev) |
|
{ |
|
unsigned int i, count = dev->num_rx_queues; |
|
|
|
/* netif_alloc_rx_queues alloc failed, resources have been unreg'ed */ |
|
if (!dev->_rx) |
|
return; |
|
|
|
for (i = 0; i < count; i++) |
|
xdp_rxq_info_unreg(&dev->_rx[i].xdp_rxq); |
|
|
|
kvfree(dev->_rx); |
|
} |
|
|
|
static void netdev_init_one_queue(struct net_device *dev, |
|
struct netdev_queue *queue, void *_unused) |
|
{ |
|
/* Initialize queue lock */ |
|
spin_lock_init(&queue->_xmit_lock); |
|
netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); |
|
queue->xmit_lock_owner = -1; |
|
netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
|
queue->dev = dev; |
|
#ifdef CONFIG_BQL |
|
dql_init(&queue->dql, HZ); |
|
#endif |
|
} |
|
|
|
static void netif_free_tx_queues(struct net_device *dev) |
|
{ |
|
kvfree(dev->_tx); |
|
} |
|
|
|
static int netif_alloc_netdev_queues(struct net_device *dev) |
|
{ |
|
unsigned int count = dev->num_tx_queues; |
|
struct netdev_queue *tx; |
|
size_t sz = count * sizeof(*tx); |
|
|
|
if (count < 1 || count > 0xffff) |
|
return -EINVAL; |
|
|
|
tx = kvzalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); |
|
if (!tx) |
|
return -ENOMEM; |
|
|
|
dev->_tx = tx; |
|
|
|
netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
|
spin_lock_init(&dev->tx_global_lock); |
|
|
|
return 0; |
|
} |
|
|
|
void netif_tx_stop_all_queues(struct net_device *dev) |
|
{ |
|
unsigned int i; |
|
|
|
for (i = 0; i < dev->num_tx_queues; i++) { |
|
struct netdev_queue *txq = netdev_get_tx_queue(dev, i); |
|
|
|
netif_tx_stop_queue(txq); |
|
} |
|
} |
|
EXPORT_SYMBOL(netif_tx_stop_all_queues); |
|
|
|
/** |
|
* register_netdevice() - register a network device |
|
* @dev: device to register |
|
* |
|
* Take a prepared network device structure and make it externally accessible. |
|
* A %NETDEV_REGISTER message is sent to the netdev notifier chain. |
|
* Callers must hold the rtnl lock - you may want register_netdev() |
|
* instead of this. |
|
*/ |
|
int register_netdevice(struct net_device *dev) |
|
{ |
|
int ret; |
|
struct net *net = dev_net(dev); |
|
|
|
BUILD_BUG_ON(sizeof(netdev_features_t) * BITS_PER_BYTE < |
|
NETDEV_FEATURE_COUNT); |
|
BUG_ON(dev_boot_phase); |
|
ASSERT_RTNL(); |
|
|
|
might_sleep(); |
|
|
|
/* When net_device's are persistent, this will be fatal. */ |
|
BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); |
|
BUG_ON(!net); |
|
|
|
ret = ethtool_check_ops(dev->ethtool_ops); |
|
if (ret) |
|
return ret; |
|
|
|
spin_lock_init(&dev->addr_list_lock); |
|
netdev_set_addr_lockdep_class(dev); |
|
|
|
ret = dev_get_valid_name(net, dev, dev->name); |
|
if (ret < 0) |
|
goto out; |
|
|
|
ret = -ENOMEM; |
|
dev->name_node = netdev_name_node_head_alloc(dev); |
|
if (!dev->name_node) |
|
goto out; |
|
|
|
/* Init, if this function is available */ |
|
if (dev->netdev_ops->ndo_init) { |
|
ret = dev->netdev_ops->ndo_init(dev); |
|
if (ret) { |
|
if (ret > 0) |
|
ret = -EIO; |
|
goto err_free_name; |
|
} |
|
} |
|
|
|
if (((dev->hw_features | dev->features) & |
|
NETIF_F_HW_VLAN_CTAG_FILTER) && |
|
(!dev->netdev_ops->ndo_vlan_rx_add_vid || |
|
!dev->netdev_ops->ndo_vlan_rx_kill_vid)) { |
|
netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n"); |
|
ret = -EINVAL; |
|
goto err_uninit; |
|
} |
|
|
|
ret = -EBUSY; |
|
if (!dev->ifindex) |
|
dev->ifindex = dev_new_index(net); |
|
else if (__dev_get_by_index(net, dev->ifindex)) |
|
goto err_uninit; |
|
|
|
/* Transfer changeable features to wanted_features and enable |
|
* software offloads (GSO and GRO). |
|
*/ |
|
dev->hw_features |= (NETIF_F_SOFT_FEATURES | NETIF_F_SOFT_FEATURES_OFF); |
|
dev->features |= NETIF_F_SOFT_FEATURES; |
|
|
|
if (dev->udp_tunnel_nic_info) { |
|
dev->features |= NETIF_F_RX_UDP_TUNNEL_PORT; |
|
dev->hw_features |= NETIF_F_RX_UDP_TUNNEL_PORT; |
|
} |
|
|
|
dev->wanted_features = dev->features & dev->hw_features; |
|
|
|
if (!(dev->flags & IFF_LOOPBACK)) |
|
dev->hw_features |= NETIF_F_NOCACHE_COPY; |
|
|
|
/* If IPv4 TCP segmentation offload is supported we should also |
|
* allow the device to enable segmenting the frame with the option |
|
* of ignoring a static IP ID value. This doesn't enable the |
|
* feature itself but allows the user to enable it later. |
|
*/ |
|
if (dev->hw_features & NETIF_F_TSO) |
|
dev->hw_features |= NETIF_F_TSO_MANGLEID; |
|
if (dev->vlan_features & NETIF_F_TSO) |
|
dev->vlan_features |= NETIF_F_TSO_MANGLEID; |
|
if (dev->mpls_features & NETIF_F_TSO) |
|
dev->mpls_features |= NETIF_F_TSO_MANGLEID; |
|
if (dev->hw_enc_features & NETIF_F_TSO) |
|
dev->hw_enc_features |= NETIF_F_TSO_MANGLEID; |
|
|
|
/* Make NETIF_F_HIGHDMA inheritable to VLAN devices. |
|
*/ |
|
dev->vlan_features |= NETIF_F_HIGHDMA; |
|
|
|
/* Make NETIF_F_SG inheritable to tunnel devices. |
|
*/ |
|
dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL; |
|
|
|
/* Make NETIF_F_SG inheritable to MPLS. |
|
*/ |
|
dev->mpls_features |= NETIF_F_SG; |
|
|
|
ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
|
ret = notifier_to_errno(ret); |
|
if (ret) |
|
goto err_uninit; |
|
|
|
ret = netdev_register_kobject(dev); |
|
write_lock(&dev_base_lock); |
|
dev->reg_state = ret ? NETREG_UNREGISTERED : NETREG_REGISTERED; |
|
write_unlock(&dev_base_lock); |
|
if (ret) |
|
goto err_uninit; |
|
|
|
__netdev_update_features(dev); |
|
|
|
/* |
|
* Default initial state at registry is that the |
|
* device is present. |
|
*/ |
|
|
|
set_bit(__LINK_STATE_PRESENT, &dev->state); |
|
|
|
linkwatch_init_dev(dev); |
|
|
|
dev_init_scheduler(dev); |
|
|
|
netdev_hold(dev, &dev->dev_registered_tracker, GFP_KERNEL); |
|
list_netdevice(dev); |
|
|
|
add_device_randomness(dev->dev_addr, dev->addr_len); |
|
|
|
/* If the device has permanent device address, driver should |
|
* set dev_addr and also addr_assign_type should be set to |
|
* NET_ADDR_PERM (default value). |
|
*/ |
|
if (dev->addr_assign_type == NET_ADDR_PERM) |
|
memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len); |
|
|
|
/* Notify protocols, that a new device appeared. */ |
|
ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
|
ret = notifier_to_errno(ret); |
|
if (ret) { |
|
/* Expect explicit free_netdev() on failure */ |
|
dev->needs_free_netdev = false; |
|
unregister_netdevice_queue(dev, NULL); |
|
goto out; |
|
} |
|
/* |
|
* Prevent userspace races by waiting until the network |
|
* device is fully setup before sending notifications. |
|
*/ |
|
if (!dev->rtnl_link_ops || |
|
dev->rtnl_link_state == RTNL_LINK_INITIALIZED) |
|
rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
|
|
|
out: |
|
return ret; |
|
|
|
err_uninit: |
|
if (dev->netdev_ops->ndo_uninit) |
|
dev->netdev_ops->ndo_uninit(dev); |
|
if (dev->priv_destructor) |
|
dev->priv_destructor(dev); |
|
err_free_name: |
|
netdev_name_node_free(dev->name_node); |
|
goto out; |
|
} |
|
EXPORT_SYMBOL(register_netdevice); |
|
|
|
/** |
|
* init_dummy_netdev - init a dummy network device for NAPI |
|
* @dev: device to init |
|
* |
|
* This takes a network device structure and initialize the minimum |
|
* amount of fields so it can be used to schedule NAPI polls without |
|
* registering a full blown interface. This is to be used by drivers |
|
* that need to tie several hardware interfaces to a single NAPI |
|
* poll scheduler due to HW limitations. |
|
*/ |
|
int init_dummy_netdev(struct net_device *dev) |
|
{ |
|
/* Clear everything. Note we don't initialize spinlocks |
|
* are they aren't supposed to be taken by any of the |
|
* NAPI code and this dummy netdev is supposed to be |
|
* only ever used for NAPI polls |
|
*/ |
|
memset(dev, 0, sizeof(struct net_device)); |
|
|
|
/* make sure we BUG if trying to hit standard |
|
* register/unregister code path |
|
*/ |
|
dev->reg_state = NETREG_DUMMY; |
|
|
|
/* NAPI wants this */ |
|
INIT_LIST_HEAD(&dev->napi_list); |
|
|
|
/* a dummy interface is started by default */ |
|
set_bit(__LINK_STATE_PRESENT, &dev->state); |
|
set_bit(__LINK_STATE_START, &dev->state); |
|
|
|
/* napi_busy_loop stats accounting wants this */ |
|
dev_net_set(dev, &init_net); |
|
|
|
/* Note : We dont allocate pcpu_refcnt for dummy devices, |
|
* because users of this 'device' dont need to change |
|
* its refcount. |
|
*/ |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(init_dummy_netdev); |
|
|
|
|
|
/** |
|
* register_netdev - register a network device |
|
* @dev: device to register |
|
* |
|
* Take a completed network device structure and add it to the kernel |
|
* interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier |
|
* chain. 0 is returned on success. A negative errno code is returned |
|
* on a failure to set up the device, or if the name is a duplicate. |
|
* |
|
* This is a wrapper around register_netdevice that takes the rtnl semaphore |
|
* and expands the device name if you passed a format string to |
|
* alloc_netdev. |
|
*/ |
|
int register_netdev(struct net_device *dev) |
|
{ |
|
int err; |
|
|
|
if (rtnl_lock_killable()) |
|
return -EINTR; |
|
err = register_netdevice(dev); |
|
rtnl_unlock(); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(register_netdev); |
|
|
|
int netdev_refcnt_read(const struct net_device *dev) |
|
{ |
|
#ifdef CONFIG_PCPU_DEV_REFCNT |
|
int i, refcnt = 0; |
|
|
|
for_each_possible_cpu(i) |
|
refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); |
|
return refcnt; |
|
#else |
|
return refcount_read(&dev->dev_refcnt); |
|
#endif |
|
} |
|
EXPORT_SYMBOL(netdev_refcnt_read); |
|
|
|
int netdev_unregister_timeout_secs __read_mostly = 10; |
|
|
|
#define WAIT_REFS_MIN_MSECS 1 |
|
#define WAIT_REFS_MAX_MSECS 250 |
|
/** |
|
* netdev_wait_allrefs_any - wait until all references are gone. |
|
* @list: list of net_devices to wait on |
|
* |
|
* This is called when unregistering network devices. |
|
* |
|
* Any protocol or device that holds a reference should register |
|
* for netdevice notification, and cleanup and put back the |
|
* reference if they receive an UNREGISTER event. |
|
* We can get stuck here if buggy protocols don't correctly |
|
* call dev_put. |
|
*/ |
|
static struct net_device *netdev_wait_allrefs_any(struct list_head *list) |
|
{ |
|
unsigned long rebroadcast_time, warning_time; |
|
struct net_device *dev; |
|
int wait = 0; |
|
|
|
rebroadcast_time = warning_time = jiffies; |
|
|
|
list_for_each_entry(dev, list, todo_list) |
|
if (netdev_refcnt_read(dev) == 1) |
|
return dev; |
|
|
|
while (true) { |
|
if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
|
rtnl_lock(); |
|
|
|
/* Rebroadcast unregister notification */ |
|
list_for_each_entry(dev, list, todo_list) |
|
call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
|
|
|
__rtnl_unlock(); |
|
rcu_barrier(); |
|
rtnl_lock(); |
|
|
|
list_for_each_entry(dev, list, todo_list) |
|
if (test_bit(__LINK_STATE_LINKWATCH_PENDING, |
|
&dev->state)) { |
|
/* We must not have linkwatch events |
|
* pending on unregister. If this |
|
* happens, we simply run the queue |
|
* unscheduled, resulting in a noop |
|
* for this device. |
|
*/ |
|
linkwatch_run_queue(); |
|
break; |
|
} |
|
|
|
__rtnl_unlock(); |
|
|
|
rebroadcast_time = jiffies; |
|
} |
|
|
|
if (!wait) { |
|
rcu_barrier(); |
|
wait = WAIT_REFS_MIN_MSECS; |
|
} else { |
|
msleep(wait); |
|
wait = min(wait << 1, WAIT_REFS_MAX_MSECS); |
|
} |
|
|
|
list_for_each_entry(dev, list, todo_list) |
|
if (netdev_refcnt_read(dev) == 1) |
|
return dev; |
|
|
|
if (time_after(jiffies, warning_time + |
|
READ_ONCE(netdev_unregister_timeout_secs) * HZ)) { |
|
list_for_each_entry(dev, list, todo_list) { |
|
pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", |
|
dev->name, netdev_refcnt_read(dev)); |
|
ref_tracker_dir_print(&dev->refcnt_tracker, 10); |
|
} |
|
|
|
warning_time = jiffies; |
|
} |
|
} |
|
} |
|
|
|
/* The sequence is: |
|
* |
|
* rtnl_lock(); |
|
* ... |
|
* register_netdevice(x1); |
|
* register_netdevice(x2); |
|
* ... |
|
* unregister_netdevice(y1); |
|
* unregister_netdevice(y2); |
|
* ... |
|
* rtnl_unlock(); |
|
* free_netdev(y1); |
|
* free_netdev(y2); |
|
* |
|
* We are invoked by rtnl_unlock(). |
|
* This allows us to deal with problems: |
|
* 1) We can delete sysfs objects which invoke hotplug |
|
* without deadlocking with linkwatch via keventd. |
|
* 2) Since we run with the RTNL semaphore not held, we can sleep |
|
* safely in order to wait for the netdev refcnt to drop to zero. |
|
* |
|
* We must not return until all unregister events added during |
|
* the interval the lock was held have been completed. |
|
*/ |
|
void netdev_run_todo(void) |
|
{ |
|
struct net_device *dev, *tmp; |
|
struct list_head list; |
|
#ifdef CONFIG_LOCKDEP |
|
struct list_head unlink_list; |
|
|
|
list_replace_init(&net_unlink_list, &unlink_list); |
|
|
|
while (!list_empty(&unlink_list)) { |
|
struct net_device *dev = list_first_entry(&unlink_list, |
|
struct net_device, |
|
unlink_list); |
|
list_del_init(&dev->unlink_list); |
|
dev->nested_level = dev->lower_level - 1; |
|
} |
|
#endif |
|
|
|
/* Snapshot list, allow later requests */ |
|
list_replace_init(&net_todo_list, &list); |
|
|
|
__rtnl_unlock(); |
|
|
|
/* Wait for rcu callbacks to finish before next phase */ |
|
if (!list_empty(&list)) |
|
rcu_barrier(); |
|
|
|
list_for_each_entry_safe(dev, tmp, &list, todo_list) { |
|
if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
|
netdev_WARN(dev, "run_todo but not unregistering\n"); |
|
list_del(&dev->todo_list); |
|
continue; |
|
} |
|
|
|
write_lock(&dev_base_lock); |
|
dev->reg_state = NETREG_UNREGISTERED; |
|
write_unlock(&dev_base_lock); |
|
linkwatch_forget_dev(dev); |
|
} |
|
|
|
while (!list_empty(&list)) { |
|
dev = netdev_wait_allrefs_any(&list); |
|
list_del(&dev->todo_list); |
|
|
|
/* paranoia */ |
|
BUG_ON(netdev_refcnt_read(dev) != 1); |
|
BUG_ON(!list_empty(&dev->ptype_all)); |
|
BUG_ON(!list_empty(&dev->ptype_specific)); |
|
WARN_ON(rcu_access_pointer(dev->ip_ptr)); |
|
WARN_ON(rcu_access_pointer(dev->ip6_ptr)); |
|
|
|
if (dev->priv_destructor) |
|
dev->priv_destructor(dev); |
|
if (dev->needs_free_netdev) |
|
free_netdev(dev); |
|
|
|
if (atomic_dec_and_test(&dev_net(dev)->dev_unreg_count)) |
|
wake_up(&netdev_unregistering_wq); |
|
|
|
/* Free network device */ |
|
kobject_put(&dev->dev.kobj); |
|
} |
|
} |
|
|
|
/* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has |
|
* all the same fields in the same order as net_device_stats, with only |
|
* the type differing, but rtnl_link_stats64 may have additional fields |
|
* at the end for newer counters. |
|
*/ |
|
void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, |
|
const struct net_device_stats *netdev_stats) |
|
{ |
|
#if BITS_PER_LONG == 64 |
|
BUILD_BUG_ON(sizeof(*stats64) < sizeof(*netdev_stats)); |
|
memcpy(stats64, netdev_stats, sizeof(*netdev_stats)); |
|
/* zero out counters that only exist in rtnl_link_stats64 */ |
|
memset((char *)stats64 + sizeof(*netdev_stats), 0, |
|
sizeof(*stats64) - sizeof(*netdev_stats)); |
|
#else |
|
size_t i, n = sizeof(*netdev_stats) / sizeof(unsigned long); |
|
const unsigned long *src = (const unsigned long *)netdev_stats; |
|
u64 *dst = (u64 *)stats64; |
|
|
|
BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64)); |
|
for (i = 0; i < n; i++) |
|
dst[i] = src[i]; |
|
/* zero out counters that only exist in rtnl_link_stats64 */ |
|
memset((char *)stats64 + n * sizeof(u64), 0, |
|
sizeof(*stats64) - n * sizeof(u64)); |
|
#endif |
|
} |
|
EXPORT_SYMBOL(netdev_stats_to_stats64); |
|
|
|
struct net_device_core_stats __percpu *netdev_core_stats_alloc(struct net_device *dev) |
|
{ |
|
struct net_device_core_stats __percpu *p; |
|
|
|
p = alloc_percpu_gfp(struct net_device_core_stats, |
|
GFP_ATOMIC | __GFP_NOWARN); |
|
|
|
if (p && cmpxchg(&dev->core_stats, NULL, p)) |
|
free_percpu(p); |
|
|
|
/* This READ_ONCE() pairs with the cmpxchg() above */ |
|
return READ_ONCE(dev->core_stats); |
|
} |
|
EXPORT_SYMBOL(netdev_core_stats_alloc); |
|
|
|
/** |
|
* dev_get_stats - get network device statistics |
|
* @dev: device to get statistics from |
|
* @storage: place to store stats |
|
* |
|
* Get network statistics from device. Return @storage. |
|
* The device driver may provide its own method by setting |
|
* dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; |
|
* otherwise the internal statistics structure is used. |
|
*/ |
|
struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
|
struct rtnl_link_stats64 *storage) |
|
{ |
|
const struct net_device_ops *ops = dev->netdev_ops; |
|
const struct net_device_core_stats __percpu *p; |
|
|
|
if (ops->ndo_get_stats64) { |
|
memset(storage, 0, sizeof(*storage)); |
|
ops->ndo_get_stats64(dev, storage); |
|
} else if (ops->ndo_get_stats) { |
|
netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
|
} else { |
|
netdev_stats_to_stats64(storage, &dev->stats); |
|
} |
|
|
|
/* This READ_ONCE() pairs with the write in netdev_core_stats_alloc() */ |
|
p = READ_ONCE(dev->core_stats); |
|
if (p) { |
|
const struct net_device_core_stats *core_stats; |
|
int i; |
|
|
|
for_each_possible_cpu(i) { |
|
core_stats = per_cpu_ptr(p, i); |
|
storage->rx_dropped += READ_ONCE(core_stats->rx_dropped); |
|
storage->tx_dropped += READ_ONCE(core_stats->tx_dropped); |
|
storage->rx_nohandler += READ_ONCE(core_stats->rx_nohandler); |
|
storage->rx_otherhost_dropped += READ_ONCE(core_stats->rx_otherhost_dropped); |
|
} |
|
} |
|
return storage; |
|
} |
|
EXPORT_SYMBOL(dev_get_stats); |
|
|
|
/** |
|
* dev_fetch_sw_netstats - get per-cpu network device statistics |
|
* @s: place to store stats |
|
* @netstats: per-cpu network stats to read from |
|
* |
|
* Read per-cpu network statistics and populate the related fields in @s. |
|
*/ |
|
void dev_fetch_sw_netstats(struct rtnl_link_stats64 *s, |
|
const struct pcpu_sw_netstats __percpu *netstats) |
|
{ |
|
int cpu; |
|
|
|
for_each_possible_cpu(cpu) { |
|
u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
|
const struct pcpu_sw_netstats *stats; |
|
unsigned int start; |
|
|
|
stats = per_cpu_ptr(netstats, cpu); |
|
do { |
|
start = u64_stats_fetch_begin_irq(&stats->syncp); |
|
rx_packets = u64_stats_read(&stats->rx_packets); |
|
rx_bytes = u64_stats_read(&stats->rx_bytes); |
|
tx_packets = u64_stats_read(&stats->tx_packets); |
|
tx_bytes = u64_stats_read(&stats->tx_bytes); |
|
} while (u64_stats_fetch_retry_irq(&stats->syncp, start)); |
|
|
|
s->rx_packets += rx_packets; |
|
s->rx_bytes += rx_bytes; |
|
s->tx_packets += tx_packets; |
|
s->tx_bytes += tx_bytes; |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(dev_fetch_sw_netstats); |
|
|
|
/** |
|
* dev_get_tstats64 - ndo_get_stats64 implementation |
|
* @dev: device to get statistics from |
|
* @s: place to store stats |
|
* |
|
* Populate @s from dev->stats and dev->tstats. Can be used as |
|
* ndo_get_stats64() callback. |
|
*/ |
|
void dev_get_tstats64(struct net_device *dev, struct rtnl_link_stats64 *s) |
|
{ |
|
netdev_stats_to_stats64(s, &dev->stats); |
|
dev_fetch_sw_netstats(s, dev->tstats); |
|
} |
|
EXPORT_SYMBOL_GPL(dev_get_tstats64); |
|
|
|
struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
|
{ |
|
struct netdev_queue *queue = dev_ingress_queue(dev); |
|
|
|
#ifdef CONFIG_NET_CLS_ACT |
|
if (queue) |
|
return queue; |
|
queue = kzalloc(sizeof(*queue), GFP_KERNEL); |
|
if (!queue) |
|
return NULL; |
|
netdev_init_one_queue(dev, queue, NULL); |
|
RCU_INIT_POINTER(queue->qdisc, &noop_qdisc); |
|
queue->qdisc_sleeping = &noop_qdisc; |
|
rcu_assign_pointer(dev->ingress_queue, queue); |
|
#endif |
|
return queue; |
|
} |
|
|
|
static const struct ethtool_ops default_ethtool_ops; |
|
|
|
void netdev_set_default_ethtool_ops(struct net_device *dev, |
|
const struct ethtool_ops *ops) |
|
{ |
|
if (dev->ethtool_ops == &default_ethtool_ops) |
|
dev->ethtool_ops = ops; |
|
} |
|
EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops); |
|
|
|
void netdev_freemem(struct net_device *dev) |
|
{ |
|
char *addr = (char *)dev - dev->padded; |
|
|
|
kvfree(addr); |
|
} |
|
|
|
/** |
|
* alloc_netdev_mqs - allocate network device |
|
* @sizeof_priv: size of private data to allocate space for |
|
* @name: device name format string |
|
* @name_assign_type: origin of device name |
|
* @setup: callback to initialize device |
|
* @txqs: the number of TX subqueues to allocate |
|
* @rxqs: the number of RX subqueues to allocate |
|
* |
|
* Allocates a struct net_device with private data area for driver use |
|
* and performs basic initialization. Also allocates subqueue structs |
|
* for each queue on the device. |
|
*/ |
|
struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
|
unsigned char name_assign_type, |
|
void (*setup)(struct net_device *), |
|
unsigned int txqs, unsigned int rxqs) |
|
{ |
|
struct net_device *dev; |
|
unsigned int alloc_size; |
|
struct net_device *p; |
|
|
|
BUG_ON(strlen(name) >= sizeof(dev->name)); |
|
|
|
if (txqs < 1) { |
|
pr_err("alloc_netdev: Unable to allocate device with zero queues\n"); |
|
return NULL; |
|
} |
|
|
|
if (rxqs < 1) { |
|
pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n"); |
|
return NULL; |
|
} |
|
|
|
alloc_size = sizeof(struct net_device); |
|
if (sizeof_priv) { |
|
/* ensure 32-byte alignment of private area */ |
|
alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
|
alloc_size += sizeof_priv; |
|
} |
|
/* ensure 32-byte alignment of whole construct */ |
|
alloc_size += NETDEV_ALIGN - 1; |
|
|
|
p = kvzalloc(alloc_size, GFP_KERNEL_ACCOUNT | __GFP_RETRY_MAYFAIL); |
|
if (!p) |
|
return NULL; |
|
|
|
dev = PTR_ALIGN(p, NETDEV_ALIGN); |
|
dev->padded = (char *)dev - (char *)p; |
|
|
|
ref_tracker_dir_init(&dev->refcnt_tracker, 128); |
|
#ifdef CONFIG_PCPU_DEV_REFCNT |
|
dev->pcpu_refcnt = alloc_percpu(int); |
|
if (!dev->pcpu_refcnt) |
|
goto free_dev; |
|
__dev_hold(dev); |
|
#else |
|
refcount_set(&dev->dev_refcnt, 1); |
|
#endif |
|
|
|
if (dev_addr_init(dev)) |
|
goto free_pcpu; |
|
|
|
dev_mc_init(dev); |
|
dev_uc_init(dev); |
|
|
|
dev_net_set(dev, &init_net); |
|
|
|
dev->gso_max_size = GSO_LEGACY_MAX_SIZE; |
|
dev->gso_max_segs = GSO_MAX_SEGS; |
|
dev->gro_max_size = GRO_LEGACY_MAX_SIZE; |
|
dev->tso_max_size = TSO_LEGACY_MAX_SIZE; |
|
dev->tso_max_segs = TSO_MAX_SEGS; |
|
dev->upper_level = 1; |
|
dev->lower_level = 1; |
|
#ifdef CONFIG_LOCKDEP |
|
dev->nested_level = 0; |
|
INIT_LIST_HEAD(&dev->unlink_list); |
|
#endif |
|
|
|
INIT_LIST_HEAD(&dev->napi_list); |
|
INIT_LIST_HEAD(&dev->unreg_list); |
|
INIT_LIST_HEAD(&dev->close_list); |
|
INIT_LIST_HEAD(&dev->link_watch_list); |
|
INIT_LIST_HEAD(&dev->adj_list.upper); |
|
INIT_LIST_HEAD(&dev->adj_list.lower); |
|
INIT_LIST_HEAD(&dev->ptype_all); |
|
INIT_LIST_HEAD(&dev->ptype_specific); |
|
INIT_LIST_HEAD(&dev->net_notifier_list); |
|
#ifdef CONFIG_NET_SCHED |
|
hash_init(dev->qdisc_hash); |
|
#endif |
|
dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM; |
|
setup(dev); |
|
|
|
if (!dev->tx_queue_len) { |
|
dev->priv_flags |= IFF_NO_QUEUE; |
|
dev->tx_queue_len = DEFAULT_TX_QUEUE_LEN; |
|
} |
|
|
|
dev->num_tx_queues = txqs; |
|
dev->real_num_tx_queues = txqs; |
|
if (netif_alloc_netdev_queues(dev)) |
|
goto free_all; |
|
|
|
dev->num_rx_queues = rxqs; |
|
dev->real_num_rx_queues = rxqs; |
|
if (netif_alloc_rx_queues(dev)) |
|
goto free_all; |
|
|
|
strcpy(dev->name, name); |
|
dev->name_assign_type = name_assign_type; |
|
dev->group = INIT_NETDEV_GROUP; |
|
if (!dev->ethtool_ops) |
|
dev->ethtool_ops = &default_ethtool_ops; |
|
|
|
nf_hook_netdev_init(dev); |
|
|
|
return dev; |
|
|
|
free_all: |
|
free_netdev(dev); |
|
return NULL; |
|
|
|
free_pcpu: |
|
#ifdef CONFIG_PCPU_DEV_REFCNT |
|
free_percpu(dev->pcpu_refcnt); |
|
free_dev: |
|
#endif |
|
netdev_freemem(dev); |
|
return NULL; |
|
} |
|
EXPORT_SYMBOL(alloc_netdev_mqs); |
|
|
|
/** |
|
* free_netdev - free network device |
|
* @dev: device |
|
* |
|
* This function does the last stage of destroying an allocated device |
|
* interface. The reference to the device object is released. If this |
|
* is the last reference then it will be freed.Must be called in process |
|
* context. |
|
*/ |
|
void free_netdev(struct net_device *dev) |
|
{ |
|
struct napi_struct *p, *n; |
|
|
|
might_sleep(); |
|
|
|
/* When called immediately after register_netdevice() failed the unwind |
|
* handling may still be dismantling the device. Handle that case by |
|
* deferring the free. |
|
*/ |
|
if (dev->reg_state == NETREG_UNREGISTERING) { |
|
ASSERT_RTNL(); |
|
dev->needs_free_netdev = true; |
|
return; |
|
} |
|
|
|
netif_free_tx_queues(dev); |
|
netif_free_rx_queues(dev); |
|
|
|
kfree(rcu_dereference_protected(dev->ingress_queue, 1)); |
|
|
|
/* Flush device addresses */ |
|
dev_addr_flush(dev); |
|
|
|
list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
|
netif_napi_del(p); |
|
|
|
ref_tracker_dir_exit(&dev->refcnt_tracker); |
|
#ifdef CONFIG_PCPU_DEV_REFCNT |
|
free_percpu(dev->pcpu_refcnt); |
|
dev->pcpu_refcnt = NULL; |
|
#endif |
|
free_percpu(dev->core_stats); |
|
dev->core_stats = NULL; |
|
free_percpu(dev->xdp_bulkq); |
|
dev->xdp_bulkq = NULL; |
|
|
|
/* Compatibility with error handling in drivers */ |
|
if (dev->reg_state == NETREG_UNINITIALIZED) { |
|
netdev_freemem(dev); |
|
return; |
|
} |
|
|
|
BUG_ON(dev->reg_state != NETREG_UNREGISTERED); |
|
dev->reg_state = NETREG_RELEASED; |
|
|
|
/* will free via device release */ |
|
put_device(&dev->dev); |
|
} |
|
EXPORT_SYMBOL(free_netdev); |
|
|
|
/** |
|
* synchronize_net - Synchronize with packet receive processing |
|
* |
|
* Wait for packets currently being received to be done. |
|
* Does not block later packets from starting. |
|
*/ |
|
void synchronize_net(void) |
|
{ |
|
might_sleep(); |
|
if (rtnl_is_locked()) |
|
synchronize_rcu_expedited(); |
|
else |
|
synchronize_rcu(); |
|
} |
|
EXPORT_SYMBOL(synchronize_net); |
|
|
|
/** |
|
* unregister_netdevice_queue - remove device from the kernel |
|
* @dev: device |
|
* @head: list |
|
* |
|
* This function shuts down a device interface and removes it |
|
* from the kernel tables. |
|
* If head not NULL, device is queued to be unregistered later. |
|
* |
|
* Callers must hold the rtnl semaphore. You may want |
|
* unregister_netdev() instead of this. |
|
*/ |
|
|
|
void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
|
{ |
|
ASSERT_RTNL(); |
|
|
|
if (head) { |
|
list_move_tail(&dev->unreg_list, head); |
|
} else { |
|
LIST_HEAD(single); |
|
|
|
list_add(&dev->unreg_list, &single); |
|
unregister_netdevice_many(&single); |
|
} |
|
} |
|
EXPORT_SYMBOL(unregister_netdevice_queue); |
|
|
|
/** |
|
* unregister_netdevice_many - unregister many devices |
|
* @head: list of devices |
|
* |
|
* Note: As most callers use a stack allocated list_head, |
|
* we force a list_del() to make sure stack wont be corrupted later. |
|
*/ |
|
void unregister_netdevice_many(struct list_head *head) |
|
{ |
|
struct net_device *dev, *tmp; |
|
LIST_HEAD(close_head); |
|
|
|
BUG_ON(dev_boot_phase); |
|
ASSERT_RTNL(); |
|
|
|
if (list_empty(head)) |
|
return; |
|
|
|
list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
|
/* Some devices call without registering |
|
* for initialization unwind. Remove those |
|
* devices and proceed with the remaining. |
|
*/ |
|
if (dev->reg_state == NETREG_UNINITIALIZED) { |
|
pr_debug("unregister_netdevice: device %s/%p never was registered\n", |
|
dev->name, dev); |
|
|
|
WARN_ON(1); |
|
list_del(&dev->unreg_list); |
|
continue; |
|
} |
|
dev->dismantle = true; |
|
BUG_ON(dev->reg_state != NETREG_REGISTERED); |
|
} |
|
|
|
/* If device is running, close it first. */ |
|
list_for_each_entry(dev, head, unreg_list) |
|
list_add_tail(&dev->close_list, &close_head); |
|
dev_close_many(&close_head, true); |
|
|
|
list_for_each_entry(dev, head, unreg_list) { |
|
/* And unlink it from device chain. */ |
|
write_lock(&dev_base_lock); |
|
unlist_netdevice(dev, false); |
|
dev->reg_state = NETREG_UNREGISTERING; |
|
write_unlock(&dev_base_lock); |
|
} |
|
flush_all_backlogs(); |
|
|
|
synchronize_net(); |
|
|
|
list_for_each_entry(dev, head, unreg_list) { |
|
struct sk_buff *skb = NULL; |
|
|
|
/* Shutdown queueing discipline. */ |
|
dev_shutdown(dev); |
|
|
|
dev_xdp_uninstall(dev); |
|
|
|
netdev_offload_xstats_disable_all(dev); |
|
|
|
/* Notify protocols, that we are about to destroy |
|
* this device. They should clean all the things. |
|
*/ |
|
call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
|
|
|
if (!dev->rtnl_link_ops || |
|
dev->rtnl_link_state == RTNL_LINK_INITIALIZED) |
|
skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U, 0, |
|
GFP_KERNEL, NULL, 0); |
|
|
|
/* |
|
* Flush the unicast and multicast chains |
|
*/ |
|
dev_uc_flush(dev); |
|
dev_mc_flush(dev); |
|
|
|
netdev_name_node_alt_flush(dev); |
|
netdev_name_node_free(dev->name_node); |
|
|
|
if (dev->netdev_ops->ndo_uninit) |
|
dev->netdev_ops->ndo_uninit(dev); |
|
|
|
if (skb) |
|
rtmsg_ifinfo_send(skb, dev, GFP_KERNEL); |
|
|
|
/* Notifier chain MUST detach us all upper devices. */ |
|
WARN_ON(netdev_has_any_upper_dev(dev)); |
|
WARN_ON(netdev_has_any_lower_dev(dev)); |
|
|
|
/* Remove entries from kobject tree */ |
|
netdev_unregister_kobject(dev); |
|
#ifdef CONFIG_XPS |
|
/* Remove XPS queueing entries */ |
|
netif_reset_xps_queues_gt(dev, 0); |
|
#endif |
|
} |
|
|
|
synchronize_net(); |
|
|
|
list_for_each_entry(dev, head, unreg_list) { |
|
netdev_put(dev, &dev->dev_registered_tracker); |
|
net_set_todo(dev); |
|
} |
|
|
|
list_del(head); |
|
} |
|
EXPORT_SYMBOL(unregister_netdevice_many); |
|
|
|
/** |
|
* unregister_netdev - remove device from the kernel |
|
* @dev: device |
|
* |
|
* This function shuts down a device interface and removes it |
|
* from the kernel tables. |
|
* |
|
* This is just a wrapper for unregister_netdevice that takes |
|
* the rtnl semaphore. In general you want to use this and not |
|
* unregister_netdevice. |
|
*/ |
|
void unregister_netdev(struct net_device *dev) |
|
{ |
|
rtnl_lock(); |
|
unregister_netdevice(dev); |
|
rtnl_unlock(); |
|
} |
|
EXPORT_SYMBOL(unregister_netdev); |
|
|
|
/** |
|
* __dev_change_net_namespace - move device to different nethost namespace |
|
* @dev: device |
|
* @net: network namespace |
|
* @pat: If not NULL name pattern to try if the current device name |
|
* is already taken in the destination network namespace. |
|
* @new_ifindex: If not zero, specifies device index in the target |
|
* namespace. |
|
* |
|
* This function shuts down a device interface and moves it |
|
* to a new network namespace. On success 0 is returned, on |
|
* a failure a netagive errno code is returned. |
|
* |
|
* Callers must hold the rtnl semaphore. |
|
*/ |
|
|
|
int __dev_change_net_namespace(struct net_device *dev, struct net *net, |
|
const char *pat, int new_ifindex) |
|
{ |
|
struct net *net_old = dev_net(dev); |
|
int err, new_nsid; |
|
|
|
ASSERT_RTNL(); |
|
|
|
/* Don't allow namespace local devices to be moved. */ |
|
err = -EINVAL; |
|
if (dev->features & NETIF_F_NETNS_LOCAL) |
|
goto out; |
|
|
|
/* Ensure the device has been registrered */ |
|
if (dev->reg_state != NETREG_REGISTERED) |
|
goto out; |
|
|
|
/* Get out if there is nothing todo */ |
|
err = 0; |
|
if (net_eq(net_old, net)) |
|
goto out; |
|
|
|
/* Pick the destination device name, and ensure |
|
* we can use it in the destination network namespace. |
|
*/ |
|
err = -EEXIST; |
|
if (netdev_name_in_use(net, dev->name)) { |
|
/* We get here if we can't use the current device name */ |
|
if (!pat) |
|
goto out; |
|
err = dev_get_valid_name(net, dev, pat); |
|
if (err < 0) |
|
goto out; |
|
} |
|
|
|
/* Check that new_ifindex isn't used yet. */ |
|
err = -EBUSY; |
|
if (new_ifindex && __dev_get_by_index(net, new_ifindex)) |
|
goto out; |
|
|
|
/* |
|
* And now a mini version of register_netdevice unregister_netdevice. |
|
*/ |
|
|
|
/* If device is running close it first. */ |
|
dev_close(dev); |
|
|
|
/* And unlink it from device chain */ |
|
unlist_netdevice(dev, true); |
|
|
|
synchronize_net(); |
|
|
|
/* Shutdown queueing discipline. */ |
|
dev_shutdown(dev); |
|
|
|
/* Notify protocols, that we are about to destroy |
|
* this device. They should clean all the things. |
|
* |
|
* Note that dev->reg_state stays at NETREG_REGISTERED. |
|
* This is wanted because this way 8021q and macvlan know |
|
* the device is just moving and can keep their slaves up. |
|
*/ |
|
call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
|
rcu_barrier(); |
|
|
|
new_nsid = peernet2id_alloc(dev_net(dev), net, GFP_KERNEL); |
|
/* If there is an ifindex conflict assign a new one */ |
|
if (!new_ifindex) { |
|
if (__dev_get_by_index(net, dev->ifindex)) |
|
new_ifindex = dev_new_index(net); |
|
else |
|
new_ifindex = dev->ifindex; |
|
} |
|
|
|
rtmsg_ifinfo_newnet(RTM_DELLINK, dev, ~0U, GFP_KERNEL, &new_nsid, |
|
new_ifindex); |
|
|
|
/* |
|
* Flush the unicast and multicast chains |
|
*/ |
|
dev_uc_flush(dev); |
|
dev_mc_flush(dev); |
|
|
|
/* Send a netdev-removed uevent to the old namespace */ |
|
kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE); |
|
netdev_adjacent_del_links(dev); |
|
|
|
/* Move per-net netdevice notifiers that are following the netdevice */ |
|
move_netdevice_notifiers_dev_net(dev, net); |
|
|
|
/* Actually switch the network namespace */ |
|
dev_net_set(dev, net); |
|
dev->ifindex = new_ifindex; |
|
|
|
/* Send a netdev-add uevent to the new namespace */ |
|
kobject_uevent(&dev->dev.kobj, KOBJ_ADD); |
|
netdev_adjacent_add_links(dev); |
|
|
|
/* Fixup kobjects */ |
|
err = device_rename(&dev->dev, dev->name); |
|
WARN_ON(err); |
|
|
|
/* Adapt owner in case owning user namespace of target network |
|
* namespace is different from the original one. |
|
*/ |
|
err = netdev_change_owner(dev, net_old, net); |
|
WARN_ON(err); |
|
|
|
/* Add the device back in the hashes */ |
|
list_netdevice(dev); |
|
|
|
/* Notify protocols, that a new device appeared. */ |
|
call_netdevice_notifiers(NETDEV_REGISTER, dev); |
|
|
|
/* |
|
* Prevent userspace races by waiting until the network |
|
* device is fully setup before sending notifications. |
|
*/ |
|
rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL); |
|
|
|
synchronize_net(); |
|
err = 0; |
|
out: |
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(__dev_change_net_namespace); |
|
|
|
static int dev_cpu_dead(unsigned int oldcpu) |
|
{ |
|
struct sk_buff **list_skb; |
|
struct sk_buff *skb; |
|
unsigned int cpu; |
|
struct softnet_data *sd, *oldsd, *remsd = NULL; |
|
|
|
local_irq_disable(); |
|
cpu = smp_processor_id(); |
|
sd = &per_cpu(softnet_data, cpu); |
|
oldsd = &per_cpu(softnet_data, oldcpu); |
|
|
|
/* Find end of our completion_queue. */ |
|
list_skb = &sd->completion_queue; |
|
while (*list_skb) |
|
list_skb = &(*list_skb)->next; |
|
/* Append completion queue from offline CPU. */ |
|
*list_skb = oldsd->completion_queue; |
|
oldsd->completion_queue = NULL; |
|
|
|
/* Append output queue from offline CPU. */ |
|
if (oldsd->output_queue) { |
|
*sd->output_queue_tailp = oldsd->output_queue; |
|
sd->output_queue_tailp = oldsd->output_queue_tailp; |
|
oldsd->output_queue = NULL; |
|
oldsd->output_queue_tailp = &oldsd->output_queue; |
|
} |
|
/* Append NAPI poll list from offline CPU, with one exception : |
|
* process_backlog() must be called by cpu owning percpu backlog. |
|
* We properly handle process_queue & input_pkt_queue later. |
|
*/ |
|
while (!list_empty(&oldsd->poll_list)) { |
|
struct napi_struct *napi = list_first_entry(&oldsd->poll_list, |
|
struct napi_struct, |
|
poll_list); |
|
|
|
list_del_init(&napi->poll_list); |
|
if (napi->poll == process_backlog) |
|
napi->state = 0; |
|
else |
|
____napi_schedule(sd, napi); |
|
} |
|
|
|
raise_softirq_irqoff(NET_TX_SOFTIRQ); |
|
local_irq_enable(); |
|
|
|
#ifdef CONFIG_RPS |
|
remsd = oldsd->rps_ipi_list; |
|
oldsd->rps_ipi_list = NULL; |
|
#endif |
|
/* send out pending IPI's on offline CPU */ |
|
net_rps_send_ipi(remsd); |
|
|
|
/* Process offline CPU's input_pkt_queue */ |
|
while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
|
netif_rx(skb); |
|
input_queue_head_incr(oldsd); |
|
} |
|
while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) { |
|
netif_rx(skb); |
|
input_queue_head_incr(oldsd); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* netdev_increment_features - increment feature set by one |
|
* @all: current feature set |
|
* @one: new feature set |
|
* @mask: mask feature set |
|
* |
|
* Computes a new feature set after adding a device with feature set |
|
* @one to the master device with current feature set @all. Will not |
|
* enable anything that is off in @mask. Returns the new feature set. |
|
*/ |
|
netdev_features_t netdev_increment_features(netdev_features_t all, |
|
netdev_features_t one, netdev_features_t mask) |
|
{ |
|
if (mask & NETIF_F_HW_CSUM) |
|
mask |= NETIF_F_CSUM_MASK; |
|
mask |= NETIF_F_VLAN_CHALLENGED; |
|
|
|
all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask; |
|
all &= one | ~NETIF_F_ALL_FOR_ALL; |
|
|
|
/* If one device supports hw checksumming, set for all. */ |
|
if (all & NETIF_F_HW_CSUM) |
|
all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM); |
|
|
|
return all; |
|
} |
|
EXPORT_SYMBOL(netdev_increment_features); |
|
|
|
static struct hlist_head * __net_init netdev_create_hash(void) |
|
{ |
|
int i; |
|
struct hlist_head *hash; |
|
|
|
hash = kmalloc_array(NETDEV_HASHENTRIES, sizeof(*hash), GFP_KERNEL); |
|
if (hash != NULL) |
|
for (i = 0; i < NETDEV_HASHENTRIES; i++) |
|
INIT_HLIST_HEAD(&hash[i]); |
|
|
|
return hash; |
|
} |
|
|
|
/* Initialize per network namespace state */ |
|
static int __net_init netdev_init(struct net *net) |
|
{ |
|
BUILD_BUG_ON(GRO_HASH_BUCKETS > |
|
8 * sizeof_field(struct napi_struct, gro_bitmask)); |
|
|
|
INIT_LIST_HEAD(&net->dev_base_head); |
|
|
|
net->dev_name_head = netdev_create_hash(); |
|
if (net->dev_name_head == NULL) |
|
goto err_name; |
|
|
|
net->dev_index_head = netdev_create_hash(); |
|
if (net->dev_index_head == NULL) |
|
goto err_idx; |
|
|
|
RAW_INIT_NOTIFIER_HEAD(&net->netdev_chain); |
|
|
|
return 0; |
|
|
|
err_idx: |
|
kfree(net->dev_name_head); |
|
err_name: |
|
return -ENOMEM; |
|
} |
|
|
|
/** |
|
* netdev_drivername - network driver for the device |
|
* @dev: network device |
|
* |
|
* Determine network driver for device. |
|
*/ |
|
const char *netdev_drivername(const struct net_device *dev) |
|
{ |
|
const struct device_driver *driver; |
|
const struct device *parent; |
|
const char *empty = ""; |
|
|
|
parent = dev->dev.parent; |
|
if (!parent) |
|
return empty; |
|
|
|
driver = parent->driver; |
|
if (driver && driver->name) |
|
return driver->name; |
|
return empty; |
|
} |
|
|
|
static void __netdev_printk(const char *level, const struct net_device *dev, |
|
struct va_format *vaf) |
|
{ |
|
if (dev && dev->dev.parent) { |
|
dev_printk_emit(level[1] - '0', |
|
dev->dev.parent, |
|
"%s %s %s%s: %pV", |
|
dev_driver_string(dev->dev.parent), |
|
dev_name(dev->dev.parent), |
|
netdev_name(dev), netdev_reg_state(dev), |
|
vaf); |
|
} else if (dev) { |
|
printk("%s%s%s: %pV", |
|
level, netdev_name(dev), netdev_reg_state(dev), vaf); |
|
} else { |
|
printk("%s(NULL net_device): %pV", level, vaf); |
|
} |
|
} |
|
|
|
void netdev_printk(const char *level, const struct net_device *dev, |
|
const char *format, ...) |
|
{ |
|
struct va_format vaf; |
|
va_list args; |
|
|
|
va_start(args, format); |
|
|
|
vaf.fmt = format; |
|
vaf.va = &args; |
|
|
|
__netdev_printk(level, dev, &vaf); |
|
|
|
va_end(args); |
|
} |
|
EXPORT_SYMBOL(netdev_printk); |
|
|
|
#define define_netdev_printk_level(func, level) \ |
|
void func(const struct net_device *dev, const char *fmt, ...) \ |
|
{ \ |
|
struct va_format vaf; \ |
|
va_list args; \ |
|
\ |
|
va_start(args, fmt); \ |
|
\ |
|
vaf.fmt = fmt; \ |
|
vaf.va = &args; \ |
|
\ |
|
__netdev_printk(level, dev, &vaf); \ |
|
\ |
|
va_end(args); \ |
|
} \ |
|
EXPORT_SYMBOL(func); |
|
|
|
define_netdev_printk_level(netdev_emerg, KERN_EMERG); |
|
define_netdev_printk_level(netdev_alert, KERN_ALERT); |
|
define_netdev_printk_level(netdev_crit, KERN_CRIT); |
|
define_netdev_printk_level(netdev_err, KERN_ERR); |
|
define_netdev_printk_level(netdev_warn, KERN_WARNING); |
|
define_netdev_printk_level(netdev_notice, KERN_NOTICE); |
|
define_netdev_printk_level(netdev_info, KERN_INFO); |
|
|
|
static void __net_exit netdev_exit(struct net *net) |
|
{ |
|
kfree(net->dev_name_head); |
|
kfree(net->dev_index_head); |
|
if (net != &init_net) |
|
WARN_ON_ONCE(!list_empty(&net->dev_base_head)); |
|
} |
|
|
|
static struct pernet_operations __net_initdata netdev_net_ops = { |
|
.init = netdev_init, |
|
.exit = netdev_exit, |
|
}; |
|
|
|
static void __net_exit default_device_exit_net(struct net *net) |
|
{ |
|
struct net_device *dev, *aux; |
|
/* |
|
* Push all migratable network devices back to the |
|
* initial network namespace |
|
*/ |
|
ASSERT_RTNL(); |
|
for_each_netdev_safe(net, dev, aux) { |
|
int err; |
|
char fb_name[IFNAMSIZ]; |
|
|
|
/* Ignore unmoveable devices (i.e. loopback) */ |
|
if (dev->features & NETIF_F_NETNS_LOCAL) |
|
continue; |
|
|
|
/* Leave virtual devices for the generic cleanup */ |
|
if (dev->rtnl_link_ops && !dev->rtnl_link_ops->netns_refund) |
|
continue; |
|
|
|
/* Push remaining network devices to init_net */ |
|
snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
|
if (netdev_name_in_use(&init_net, fb_name)) |
|
snprintf(fb_name, IFNAMSIZ, "dev%%d"); |
|
err = dev_change_net_namespace(dev, &init_net, fb_name); |
|
if (err) { |
|
pr_emerg("%s: failed to move %s to init_net: %d\n", |
|
__func__, dev->name, err); |
|
BUG(); |
|
} |
|
} |
|
} |
|
|
|
static void __net_exit default_device_exit_batch(struct list_head *net_list) |
|
{ |
|
/* At exit all network devices most be removed from a network |
|
* namespace. Do this in the reverse order of registration. |
|
* Do this across as many network namespaces as possible to |
|
* improve batching efficiency. |
|
*/ |
|
struct net_device *dev; |
|
struct net *net; |
|
LIST_HEAD(dev_kill_list); |
|
|
|
rtnl_lock(); |
|
list_for_each_entry(net, net_list, exit_list) { |
|
default_device_exit_net(net); |
|
cond_resched(); |
|
} |
|
|
|
list_for_each_entry(net, net_list, exit_list) { |
|
for_each_netdev_reverse(net, dev) { |
|
if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) |
|
dev->rtnl_link_ops->dellink(dev, &dev_kill_list); |
|
else |
|
unregister_netdevice_queue(dev, &dev_kill_list); |
|
} |
|
} |
|
unregister_netdevice_many(&dev_kill_list); |
|
rtnl_unlock(); |
|
} |
|
|
|
static struct pernet_operations __net_initdata default_device_ops = { |
|
.exit_batch = default_device_exit_batch, |
|
}; |
|
|
|
/* |
|
* Initialize the DEV module. At boot time this walks the device list and |
|
* unhooks any devices that fail to initialise (normally hardware not |
|
* present) and leaves us with a valid list of present and active devices. |
|
* |
|
*/ |
|
|
|
/* |
|
* This is called single threaded during boot, so no need |
|
* to take the rtnl semaphore. |
|
*/ |
|
static int __init net_dev_init(void) |
|
{ |
|
int i, rc = -ENOMEM; |
|
|
|
BUG_ON(!dev_boot_phase); |
|
|
|
if (dev_proc_init()) |
|
goto out; |
|
|
|
if (netdev_kobject_init()) |
|
goto out; |
|
|
|
INIT_LIST_HEAD(&ptype_all); |
|
for (i = 0; i < PTYPE_HASH_SIZE; i++) |
|
INIT_LIST_HEAD(&ptype_base[i]); |
|
|
|
if (register_pernet_subsys(&netdev_net_ops)) |
|
goto out; |
|
|
|
/* |
|
* Initialise the packet receive queues. |
|
*/ |
|
|
|
for_each_possible_cpu(i) { |
|
struct work_struct *flush = per_cpu_ptr(&flush_works, i); |
|
struct softnet_data *sd = &per_cpu(softnet_data, i); |
|
|
|
INIT_WORK(flush, flush_backlog); |
|
|
|
skb_queue_head_init(&sd->input_pkt_queue); |
|
skb_queue_head_init(&sd->process_queue); |
|
#ifdef CONFIG_XFRM_OFFLOAD |
|
skb_queue_head_init(&sd->xfrm_backlog); |
|
#endif |
|
INIT_LIST_HEAD(&sd->poll_list); |
|
sd->output_queue_tailp = &sd->output_queue; |
|
#ifdef CONFIG_RPS |
|
INIT_CSD(&sd->csd, rps_trigger_softirq, sd); |
|
sd->cpu = i; |
|
#endif |
|
INIT_CSD(&sd->defer_csd, trigger_rx_softirq, sd); |
|
spin_lock_init(&sd->defer_lock); |
|
|
|
init_gro_hash(&sd->backlog); |
|
sd->backlog.poll = process_backlog; |
|
sd->backlog.weight = weight_p; |
|
} |
|
|
|
dev_boot_phase = 0; |
|
|
|
/* The loopback device is special if any other network devices |
|
* is present in a network namespace the loopback device must |
|
* be present. Since we now dynamically allocate and free the |
|
* loopback device ensure this invariant is maintained by |
|
* keeping the loopback device as the first device on the |
|
* list of network devices. Ensuring the loopback devices |
|
* is the first device that appears and the last network device |
|
* that disappears. |
|
*/ |
|
if (register_pernet_device(&loopback_net_ops)) |
|
goto out; |
|
|
|
if (register_pernet_device(&default_device_ops)) |
|
goto out; |
|
|
|
open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
|
open_softirq(NET_RX_SOFTIRQ, net_rx_action); |
|
|
|
rc = cpuhp_setup_state_nocalls(CPUHP_NET_DEV_DEAD, "net/dev:dead", |
|
NULL, dev_cpu_dead); |
|
WARN_ON(rc < 0); |
|
rc = 0; |
|
out: |
|
return rc; |
|
} |
|
|
|
subsys_initcall(net_dev_init);
|
|
|