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2605 lines
64 KiB
2605 lines
64 KiB
/* |
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* Virtual network driver for conversing with remote driver backends. |
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* |
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* Copyright (c) 2002-2005, K A Fraser |
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* Copyright (c) 2005, XenSource Ltd |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License version 2 |
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* as published by the Free Software Foundation; or, when distributed |
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* separately from the Linux kernel or incorporated into other |
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* software packages, subject to the following license: |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this source file (the "Software"), to deal in the Software without |
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* restriction, including without limitation the rights to use, copy, modify, |
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* merge, publish, distribute, sublicense, and/or sell copies of the Software, |
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* and to permit persons to whom the Software is furnished to do so, subject to |
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* the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS |
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* IN THE SOFTWARE. |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/netdevice.h> |
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#include <linux/etherdevice.h> |
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#include <linux/skbuff.h> |
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#include <linux/ethtool.h> |
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#include <linux/if_ether.h> |
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#include <net/tcp.h> |
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#include <linux/udp.h> |
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#include <linux/moduleparam.h> |
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#include <linux/mm.h> |
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#include <linux/slab.h> |
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#include <net/ip.h> |
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#include <linux/bpf.h> |
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#include <net/page_pool.h> |
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#include <linux/bpf_trace.h> |
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|
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#include <xen/xen.h> |
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#include <xen/xenbus.h> |
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#include <xen/events.h> |
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#include <xen/page.h> |
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#include <xen/platform_pci.h> |
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#include <xen/grant_table.h> |
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|
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#include <xen/interface/io/netif.h> |
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#include <xen/interface/memory.h> |
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#include <xen/interface/grant_table.h> |
|
|
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/* Module parameters */ |
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#define MAX_QUEUES_DEFAULT 8 |
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static unsigned int xennet_max_queues; |
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module_param_named(max_queues, xennet_max_queues, uint, 0644); |
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MODULE_PARM_DESC(max_queues, |
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"Maximum number of queues per virtual interface"); |
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|
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#define XENNET_TIMEOUT (5 * HZ) |
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|
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static const struct ethtool_ops xennet_ethtool_ops; |
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|
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struct netfront_cb { |
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int pull_to; |
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}; |
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|
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#define NETFRONT_SKB_CB(skb) ((struct netfront_cb *)((skb)->cb)) |
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|
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#define RX_COPY_THRESHOLD 256 |
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|
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#define GRANT_INVALID_REF 0 |
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|
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#define NET_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, XEN_PAGE_SIZE) |
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#define NET_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, XEN_PAGE_SIZE) |
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|
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/* Minimum number of Rx slots (includes slot for GSO metadata). */ |
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#define NET_RX_SLOTS_MIN (XEN_NETIF_NR_SLOTS_MIN + 1) |
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|
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/* Queue name is interface name with "-qNNN" appended */ |
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#define QUEUE_NAME_SIZE (IFNAMSIZ + 6) |
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|
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/* IRQ name is queue name with "-tx" or "-rx" appended */ |
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#define IRQ_NAME_SIZE (QUEUE_NAME_SIZE + 3) |
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|
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static DECLARE_WAIT_QUEUE_HEAD(module_wq); |
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|
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struct netfront_stats { |
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u64 packets; |
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u64 bytes; |
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struct u64_stats_sync syncp; |
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}; |
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|
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struct netfront_info; |
|
|
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struct netfront_queue { |
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unsigned int id; /* Queue ID, 0-based */ |
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char name[QUEUE_NAME_SIZE]; /* DEVNAME-qN */ |
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struct netfront_info *info; |
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|
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struct bpf_prog __rcu *xdp_prog; |
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|
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struct napi_struct napi; |
|
|
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/* Split event channels support, tx_* == rx_* when using |
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* single event channel. |
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*/ |
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unsigned int tx_evtchn, rx_evtchn; |
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unsigned int tx_irq, rx_irq; |
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/* Only used when split event channels support is enabled */ |
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char tx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-tx */ |
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char rx_irq_name[IRQ_NAME_SIZE]; /* DEVNAME-qN-rx */ |
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|
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spinlock_t tx_lock; |
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struct xen_netif_tx_front_ring tx; |
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int tx_ring_ref; |
|
|
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/* |
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* {tx,rx}_skbs store outstanding skbuffs. Free tx_skb entries |
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* are linked from tx_skb_freelist through tx_link. |
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*/ |
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struct sk_buff *tx_skbs[NET_TX_RING_SIZE]; |
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unsigned short tx_link[NET_TX_RING_SIZE]; |
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#define TX_LINK_NONE 0xffff |
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#define TX_PENDING 0xfffe |
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grant_ref_t gref_tx_head; |
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grant_ref_t grant_tx_ref[NET_TX_RING_SIZE]; |
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struct page *grant_tx_page[NET_TX_RING_SIZE]; |
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unsigned tx_skb_freelist; |
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unsigned int tx_pend_queue; |
|
|
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spinlock_t rx_lock ____cacheline_aligned_in_smp; |
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struct xen_netif_rx_front_ring rx; |
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int rx_ring_ref; |
|
|
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struct timer_list rx_refill_timer; |
|
|
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struct sk_buff *rx_skbs[NET_RX_RING_SIZE]; |
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grant_ref_t gref_rx_head; |
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grant_ref_t grant_rx_ref[NET_RX_RING_SIZE]; |
|
|
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struct page_pool *page_pool; |
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struct xdp_rxq_info xdp_rxq; |
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}; |
|
|
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struct netfront_info { |
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struct list_head list; |
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struct net_device *netdev; |
|
|
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struct xenbus_device *xbdev; |
|
|
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/* Multi-queue support */ |
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struct netfront_queue *queues; |
|
|
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/* Statistics */ |
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struct netfront_stats __percpu *rx_stats; |
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struct netfront_stats __percpu *tx_stats; |
|
|
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/* XDP state */ |
|
bool netback_has_xdp_headroom; |
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bool netfront_xdp_enabled; |
|
|
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/* Is device behaving sane? */ |
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bool broken; |
|
|
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atomic_t rx_gso_checksum_fixup; |
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}; |
|
|
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struct netfront_rx_info { |
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struct xen_netif_rx_response rx; |
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struct xen_netif_extra_info extras[XEN_NETIF_EXTRA_TYPE_MAX - 1]; |
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}; |
|
|
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/* |
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* Access macros for acquiring freeing slots in tx_skbs[]. |
|
*/ |
|
|
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static void add_id_to_list(unsigned *head, unsigned short *list, |
|
unsigned short id) |
|
{ |
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list[id] = *head; |
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*head = id; |
|
} |
|
|
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static unsigned short get_id_from_list(unsigned *head, unsigned short *list) |
|
{ |
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unsigned int id = *head; |
|
|
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if (id != TX_LINK_NONE) { |
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*head = list[id]; |
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list[id] = TX_LINK_NONE; |
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} |
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return id; |
|
} |
|
|
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static int xennet_rxidx(RING_IDX idx) |
|
{ |
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return idx & (NET_RX_RING_SIZE - 1); |
|
} |
|
|
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static struct sk_buff *xennet_get_rx_skb(struct netfront_queue *queue, |
|
RING_IDX ri) |
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{ |
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int i = xennet_rxidx(ri); |
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struct sk_buff *skb = queue->rx_skbs[i]; |
|
queue->rx_skbs[i] = NULL; |
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return skb; |
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} |
|
|
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static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue, |
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RING_IDX ri) |
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{ |
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int i = xennet_rxidx(ri); |
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grant_ref_t ref = queue->grant_rx_ref[i]; |
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queue->grant_rx_ref[i] = GRANT_INVALID_REF; |
|
return ref; |
|
} |
|
|
|
#ifdef CONFIG_SYSFS |
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static const struct attribute_group xennet_dev_group; |
|
#endif |
|
|
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static bool xennet_can_sg(struct net_device *dev) |
|
{ |
|
return dev->features & NETIF_F_SG; |
|
} |
|
|
|
|
|
static void rx_refill_timeout(struct timer_list *t) |
|
{ |
|
struct netfront_queue *queue = from_timer(queue, t, rx_refill_timer); |
|
napi_schedule(&queue->napi); |
|
} |
|
|
|
static int netfront_tx_slot_available(struct netfront_queue *queue) |
|
{ |
|
return (queue->tx.req_prod_pvt - queue->tx.rsp_cons) < |
|
(NET_TX_RING_SIZE - XEN_NETIF_NR_SLOTS_MIN - 1); |
|
} |
|
|
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static void xennet_maybe_wake_tx(struct netfront_queue *queue) |
|
{ |
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struct net_device *dev = queue->info->netdev; |
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struct netdev_queue *dev_queue = netdev_get_tx_queue(dev, queue->id); |
|
|
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if (unlikely(netif_tx_queue_stopped(dev_queue)) && |
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netfront_tx_slot_available(queue) && |
|
likely(netif_running(dev))) |
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netif_tx_wake_queue(netdev_get_tx_queue(dev, queue->id)); |
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} |
|
|
|
|
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static struct sk_buff *xennet_alloc_one_rx_buffer(struct netfront_queue *queue) |
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{ |
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struct sk_buff *skb; |
|
struct page *page; |
|
|
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skb = __netdev_alloc_skb(queue->info->netdev, |
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RX_COPY_THRESHOLD + NET_IP_ALIGN, |
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GFP_ATOMIC | __GFP_NOWARN); |
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if (unlikely(!skb)) |
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return NULL; |
|
|
|
page = page_pool_dev_alloc_pages(queue->page_pool); |
|
if (unlikely(!page)) { |
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kfree_skb(skb); |
|
return NULL; |
|
} |
|
skb_add_rx_frag(skb, 0, page, 0, 0, PAGE_SIZE); |
|
|
|
/* Align ip header to a 16 bytes boundary */ |
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skb_reserve(skb, NET_IP_ALIGN); |
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skb->dev = queue->info->netdev; |
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|
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return skb; |
|
} |
|
|
|
|
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static void xennet_alloc_rx_buffers(struct netfront_queue *queue) |
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{ |
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RING_IDX req_prod = queue->rx.req_prod_pvt; |
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int notify; |
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int err = 0; |
|
|
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if (unlikely(!netif_carrier_ok(queue->info->netdev))) |
|
return; |
|
|
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for (req_prod = queue->rx.req_prod_pvt; |
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req_prod - queue->rx.rsp_cons < NET_RX_RING_SIZE; |
|
req_prod++) { |
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struct sk_buff *skb; |
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unsigned short id; |
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grant_ref_t ref; |
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struct page *page; |
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struct xen_netif_rx_request *req; |
|
|
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skb = xennet_alloc_one_rx_buffer(queue); |
|
if (!skb) { |
|
err = -ENOMEM; |
|
break; |
|
} |
|
|
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id = xennet_rxidx(req_prod); |
|
|
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BUG_ON(queue->rx_skbs[id]); |
|
queue->rx_skbs[id] = skb; |
|
|
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ref = gnttab_claim_grant_reference(&queue->gref_rx_head); |
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WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); |
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queue->grant_rx_ref[id] = ref; |
|
|
|
page = skb_frag_page(&skb_shinfo(skb)->frags[0]); |
|
|
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req = RING_GET_REQUEST(&queue->rx, req_prod); |
|
gnttab_page_grant_foreign_access_ref_one(ref, |
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queue->info->xbdev->otherend_id, |
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page, |
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0); |
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req->id = id; |
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req->gref = ref; |
|
} |
|
|
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queue->rx.req_prod_pvt = req_prod; |
|
|
|
/* Try again later if there are not enough requests or skb allocation |
|
* failed. |
|
* Enough requests is quantified as the sum of newly created slots and |
|
* the unconsumed slots at the backend. |
|
*/ |
|
if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN || |
|
unlikely(err)) { |
|
mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10)); |
|
return; |
|
} |
|
|
|
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->rx, notify); |
|
if (notify) |
|
notify_remote_via_irq(queue->rx_irq); |
|
} |
|
|
|
static int xennet_open(struct net_device *dev) |
|
{ |
|
struct netfront_info *np = netdev_priv(dev); |
|
unsigned int num_queues = dev->real_num_tx_queues; |
|
unsigned int i = 0; |
|
struct netfront_queue *queue = NULL; |
|
|
|
if (!np->queues || np->broken) |
|
return -ENODEV; |
|
|
|
for (i = 0; i < num_queues; ++i) { |
|
queue = &np->queues[i]; |
|
napi_enable(&queue->napi); |
|
|
|
spin_lock_bh(&queue->rx_lock); |
|
if (netif_carrier_ok(dev)) { |
|
xennet_alloc_rx_buffers(queue); |
|
queue->rx.sring->rsp_event = queue->rx.rsp_cons + 1; |
|
if (RING_HAS_UNCONSUMED_RESPONSES(&queue->rx)) |
|
napi_schedule(&queue->napi); |
|
} |
|
spin_unlock_bh(&queue->rx_lock); |
|
} |
|
|
|
netif_tx_start_all_queues(dev); |
|
|
|
return 0; |
|
} |
|
|
|
static void xennet_tx_buf_gc(struct netfront_queue *queue) |
|
{ |
|
RING_IDX cons, prod; |
|
unsigned short id; |
|
struct sk_buff *skb; |
|
bool more_to_do; |
|
const struct device *dev = &queue->info->netdev->dev; |
|
|
|
BUG_ON(!netif_carrier_ok(queue->info->netdev)); |
|
|
|
do { |
|
prod = queue->tx.sring->rsp_prod; |
|
if (RING_RESPONSE_PROD_OVERFLOW(&queue->tx, prod)) { |
|
dev_alert(dev, "Illegal number of responses %u\n", |
|
prod - queue->tx.rsp_cons); |
|
goto err; |
|
} |
|
rmb(); /* Ensure we see responses up to 'rp'. */ |
|
|
|
for (cons = queue->tx.rsp_cons; cons != prod; cons++) { |
|
struct xen_netif_tx_response txrsp; |
|
|
|
RING_COPY_RESPONSE(&queue->tx, cons, &txrsp); |
|
if (txrsp.status == XEN_NETIF_RSP_NULL) |
|
continue; |
|
|
|
id = txrsp.id; |
|
if (id >= RING_SIZE(&queue->tx)) { |
|
dev_alert(dev, |
|
"Response has incorrect id (%u)\n", |
|
id); |
|
goto err; |
|
} |
|
if (queue->tx_link[id] != TX_PENDING) { |
|
dev_alert(dev, |
|
"Response for inactive request\n"); |
|
goto err; |
|
} |
|
|
|
queue->tx_link[id] = TX_LINK_NONE; |
|
skb = queue->tx_skbs[id]; |
|
queue->tx_skbs[id] = NULL; |
|
if (unlikely(gnttab_query_foreign_access( |
|
queue->grant_tx_ref[id]) != 0)) { |
|
dev_alert(dev, |
|
"Grant still in use by backend domain\n"); |
|
goto err; |
|
} |
|
gnttab_end_foreign_access_ref( |
|
queue->grant_tx_ref[id], GNTMAP_readonly); |
|
gnttab_release_grant_reference( |
|
&queue->gref_tx_head, queue->grant_tx_ref[id]); |
|
queue->grant_tx_ref[id] = GRANT_INVALID_REF; |
|
queue->grant_tx_page[id] = NULL; |
|
add_id_to_list(&queue->tx_skb_freelist, queue->tx_link, id); |
|
dev_kfree_skb_irq(skb); |
|
} |
|
|
|
queue->tx.rsp_cons = prod; |
|
|
|
RING_FINAL_CHECK_FOR_RESPONSES(&queue->tx, more_to_do); |
|
} while (more_to_do); |
|
|
|
xennet_maybe_wake_tx(queue); |
|
|
|
return; |
|
|
|
err: |
|
queue->info->broken = true; |
|
dev_alert(dev, "Disabled for further use\n"); |
|
} |
|
|
|
struct xennet_gnttab_make_txreq { |
|
struct netfront_queue *queue; |
|
struct sk_buff *skb; |
|
struct page *page; |
|
struct xen_netif_tx_request *tx; /* Last request on ring page */ |
|
struct xen_netif_tx_request tx_local; /* Last request local copy*/ |
|
unsigned int size; |
|
}; |
|
|
|
static void xennet_tx_setup_grant(unsigned long gfn, unsigned int offset, |
|
unsigned int len, void *data) |
|
{ |
|
struct xennet_gnttab_make_txreq *info = data; |
|
unsigned int id; |
|
struct xen_netif_tx_request *tx; |
|
grant_ref_t ref; |
|
/* convenient aliases */ |
|
struct page *page = info->page; |
|
struct netfront_queue *queue = info->queue; |
|
struct sk_buff *skb = info->skb; |
|
|
|
id = get_id_from_list(&queue->tx_skb_freelist, queue->tx_link); |
|
tx = RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); |
|
ref = gnttab_claim_grant_reference(&queue->gref_tx_head); |
|
WARN_ON_ONCE(IS_ERR_VALUE((unsigned long)(int)ref)); |
|
|
|
gnttab_grant_foreign_access_ref(ref, queue->info->xbdev->otherend_id, |
|
gfn, GNTMAP_readonly); |
|
|
|
queue->tx_skbs[id] = skb; |
|
queue->grant_tx_page[id] = page; |
|
queue->grant_tx_ref[id] = ref; |
|
|
|
info->tx_local.id = id; |
|
info->tx_local.gref = ref; |
|
info->tx_local.offset = offset; |
|
info->tx_local.size = len; |
|
info->tx_local.flags = 0; |
|
|
|
*tx = info->tx_local; |
|
|
|
/* |
|
* Put the request in the pending queue, it will be set to be pending |
|
* when the producer index is about to be raised. |
|
*/ |
|
add_id_to_list(&queue->tx_pend_queue, queue->tx_link, id); |
|
|
|
info->tx = tx; |
|
info->size += info->tx_local.size; |
|
} |
|
|
|
static struct xen_netif_tx_request *xennet_make_first_txreq( |
|
struct xennet_gnttab_make_txreq *info, |
|
unsigned int offset, unsigned int len) |
|
{ |
|
info->size = 0; |
|
|
|
gnttab_for_one_grant(info->page, offset, len, xennet_tx_setup_grant, info); |
|
|
|
return info->tx; |
|
} |
|
|
|
static void xennet_make_one_txreq(unsigned long gfn, unsigned int offset, |
|
unsigned int len, void *data) |
|
{ |
|
struct xennet_gnttab_make_txreq *info = data; |
|
|
|
info->tx->flags |= XEN_NETTXF_more_data; |
|
skb_get(info->skb); |
|
xennet_tx_setup_grant(gfn, offset, len, data); |
|
} |
|
|
|
static void xennet_make_txreqs( |
|
struct xennet_gnttab_make_txreq *info, |
|
struct page *page, |
|
unsigned int offset, unsigned int len) |
|
{ |
|
/* Skip unused frames from start of page */ |
|
page += offset >> PAGE_SHIFT; |
|
offset &= ~PAGE_MASK; |
|
|
|
while (len) { |
|
info->page = page; |
|
info->size = 0; |
|
|
|
gnttab_foreach_grant_in_range(page, offset, len, |
|
xennet_make_one_txreq, |
|
info); |
|
|
|
page++; |
|
offset = 0; |
|
len -= info->size; |
|
} |
|
} |
|
|
|
/* |
|
* Count how many ring slots are required to send this skb. Each frag |
|
* might be a compound page. |
|
*/ |
|
static int xennet_count_skb_slots(struct sk_buff *skb) |
|
{ |
|
int i, frags = skb_shinfo(skb)->nr_frags; |
|
int slots; |
|
|
|
slots = gnttab_count_grant(offset_in_page(skb->data), |
|
skb_headlen(skb)); |
|
|
|
for (i = 0; i < frags; i++) { |
|
skb_frag_t *frag = skb_shinfo(skb)->frags + i; |
|
unsigned long size = skb_frag_size(frag); |
|
unsigned long offset = skb_frag_off(frag); |
|
|
|
/* Skip unused frames from start of page */ |
|
offset &= ~PAGE_MASK; |
|
|
|
slots += gnttab_count_grant(offset, size); |
|
} |
|
|
|
return slots; |
|
} |
|
|
|
static u16 xennet_select_queue(struct net_device *dev, struct sk_buff *skb, |
|
struct net_device *sb_dev) |
|
{ |
|
unsigned int num_queues = dev->real_num_tx_queues; |
|
u32 hash; |
|
u16 queue_idx; |
|
|
|
/* First, check if there is only one queue */ |
|
if (num_queues == 1) { |
|
queue_idx = 0; |
|
} else { |
|
hash = skb_get_hash(skb); |
|
queue_idx = hash % num_queues; |
|
} |
|
|
|
return queue_idx; |
|
} |
|
|
|
static void xennet_mark_tx_pending(struct netfront_queue *queue) |
|
{ |
|
unsigned int i; |
|
|
|
while ((i = get_id_from_list(&queue->tx_pend_queue, queue->tx_link)) != |
|
TX_LINK_NONE) |
|
queue->tx_link[i] = TX_PENDING; |
|
} |
|
|
|
static int xennet_xdp_xmit_one(struct net_device *dev, |
|
struct netfront_queue *queue, |
|
struct xdp_frame *xdpf) |
|
{ |
|
struct netfront_info *np = netdev_priv(dev); |
|
struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); |
|
struct xennet_gnttab_make_txreq info = { |
|
.queue = queue, |
|
.skb = NULL, |
|
.page = virt_to_page(xdpf->data), |
|
}; |
|
int notify; |
|
|
|
xennet_make_first_txreq(&info, |
|
offset_in_page(xdpf->data), |
|
xdpf->len); |
|
|
|
xennet_mark_tx_pending(queue); |
|
|
|
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); |
|
if (notify) |
|
notify_remote_via_irq(queue->tx_irq); |
|
|
|
u64_stats_update_begin(&tx_stats->syncp); |
|
tx_stats->bytes += xdpf->len; |
|
tx_stats->packets++; |
|
u64_stats_update_end(&tx_stats->syncp); |
|
|
|
xennet_tx_buf_gc(queue); |
|
|
|
return 0; |
|
} |
|
|
|
static int xennet_xdp_xmit(struct net_device *dev, int n, |
|
struct xdp_frame **frames, u32 flags) |
|
{ |
|
unsigned int num_queues = dev->real_num_tx_queues; |
|
struct netfront_info *np = netdev_priv(dev); |
|
struct netfront_queue *queue = NULL; |
|
unsigned long irq_flags; |
|
int nxmit = 0; |
|
int i; |
|
|
|
if (unlikely(np->broken)) |
|
return -ENODEV; |
|
if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK)) |
|
return -EINVAL; |
|
|
|
queue = &np->queues[smp_processor_id() % num_queues]; |
|
|
|
spin_lock_irqsave(&queue->tx_lock, irq_flags); |
|
for (i = 0; i < n; i++) { |
|
struct xdp_frame *xdpf = frames[i]; |
|
|
|
if (!xdpf) |
|
continue; |
|
if (xennet_xdp_xmit_one(dev, queue, xdpf)) |
|
break; |
|
nxmit++; |
|
} |
|
spin_unlock_irqrestore(&queue->tx_lock, irq_flags); |
|
|
|
return nxmit; |
|
} |
|
|
|
|
|
#define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1) |
|
|
|
static netdev_tx_t xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) |
|
{ |
|
struct netfront_info *np = netdev_priv(dev); |
|
struct netfront_stats *tx_stats = this_cpu_ptr(np->tx_stats); |
|
struct xen_netif_tx_request *first_tx; |
|
unsigned int i; |
|
int notify; |
|
int slots; |
|
struct page *page; |
|
unsigned int offset; |
|
unsigned int len; |
|
unsigned long flags; |
|
struct netfront_queue *queue = NULL; |
|
struct xennet_gnttab_make_txreq info = { }; |
|
unsigned int num_queues = dev->real_num_tx_queues; |
|
u16 queue_index; |
|
struct sk_buff *nskb; |
|
|
|
/* Drop the packet if no queues are set up */ |
|
if (num_queues < 1) |
|
goto drop; |
|
if (unlikely(np->broken)) |
|
goto drop; |
|
/* Determine which queue to transmit this SKB on */ |
|
queue_index = skb_get_queue_mapping(skb); |
|
queue = &np->queues[queue_index]; |
|
|
|
/* If skb->len is too big for wire format, drop skb and alert |
|
* user about misconfiguration. |
|
*/ |
|
if (unlikely(skb->len > XEN_NETIF_MAX_TX_SIZE)) { |
|
net_alert_ratelimited( |
|
"xennet: skb->len = %u, too big for wire format\n", |
|
skb->len); |
|
goto drop; |
|
} |
|
|
|
slots = xennet_count_skb_slots(skb); |
|
if (unlikely(slots > MAX_XEN_SKB_FRAGS + 1)) { |
|
net_dbg_ratelimited("xennet: skb rides the rocket: %d slots, %d bytes\n", |
|
slots, skb->len); |
|
if (skb_linearize(skb)) |
|
goto drop; |
|
} |
|
|
|
page = virt_to_page(skb->data); |
|
offset = offset_in_page(skb->data); |
|
|
|
/* The first req should be at least ETH_HLEN size or the packet will be |
|
* dropped by netback. |
|
*/ |
|
if (unlikely(PAGE_SIZE - offset < ETH_HLEN)) { |
|
nskb = skb_copy(skb, GFP_ATOMIC); |
|
if (!nskb) |
|
goto drop; |
|
dev_consume_skb_any(skb); |
|
skb = nskb; |
|
page = virt_to_page(skb->data); |
|
offset = offset_in_page(skb->data); |
|
} |
|
|
|
len = skb_headlen(skb); |
|
|
|
spin_lock_irqsave(&queue->tx_lock, flags); |
|
|
|
if (unlikely(!netif_carrier_ok(dev) || |
|
(slots > 1 && !xennet_can_sg(dev)) || |
|
netif_needs_gso(skb, netif_skb_features(skb)))) { |
|
spin_unlock_irqrestore(&queue->tx_lock, flags); |
|
goto drop; |
|
} |
|
|
|
/* First request for the linear area. */ |
|
info.queue = queue; |
|
info.skb = skb; |
|
info.page = page; |
|
first_tx = xennet_make_first_txreq(&info, offset, len); |
|
offset += info.tx_local.size; |
|
if (offset == PAGE_SIZE) { |
|
page++; |
|
offset = 0; |
|
} |
|
len -= info.tx_local.size; |
|
|
|
if (skb->ip_summed == CHECKSUM_PARTIAL) |
|
/* local packet? */ |
|
first_tx->flags |= XEN_NETTXF_csum_blank | |
|
XEN_NETTXF_data_validated; |
|
else if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
|
/* remote but checksummed. */ |
|
first_tx->flags |= XEN_NETTXF_data_validated; |
|
|
|
/* Optional extra info after the first request. */ |
|
if (skb_shinfo(skb)->gso_size) { |
|
struct xen_netif_extra_info *gso; |
|
|
|
gso = (struct xen_netif_extra_info *) |
|
RING_GET_REQUEST(&queue->tx, queue->tx.req_prod_pvt++); |
|
|
|
first_tx->flags |= XEN_NETTXF_extra_info; |
|
|
|
gso->u.gso.size = skb_shinfo(skb)->gso_size; |
|
gso->u.gso.type = (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV6) ? |
|
XEN_NETIF_GSO_TYPE_TCPV6 : |
|
XEN_NETIF_GSO_TYPE_TCPV4; |
|
gso->u.gso.pad = 0; |
|
gso->u.gso.features = 0; |
|
|
|
gso->type = XEN_NETIF_EXTRA_TYPE_GSO; |
|
gso->flags = 0; |
|
} |
|
|
|
/* Requests for the rest of the linear area. */ |
|
xennet_make_txreqs(&info, page, offset, len); |
|
|
|
/* Requests for all the frags. */ |
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; |
|
xennet_make_txreqs(&info, skb_frag_page(frag), |
|
skb_frag_off(frag), |
|
skb_frag_size(frag)); |
|
} |
|
|
|
/* First request has the packet length. */ |
|
first_tx->size = skb->len; |
|
|
|
/* timestamp packet in software */ |
|
skb_tx_timestamp(skb); |
|
|
|
xennet_mark_tx_pending(queue); |
|
|
|
RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&queue->tx, notify); |
|
if (notify) |
|
notify_remote_via_irq(queue->tx_irq); |
|
|
|
u64_stats_update_begin(&tx_stats->syncp); |
|
tx_stats->bytes += skb->len; |
|
tx_stats->packets++; |
|
u64_stats_update_end(&tx_stats->syncp); |
|
|
|
/* Note: It is not safe to access skb after xennet_tx_buf_gc()! */ |
|
xennet_tx_buf_gc(queue); |
|
|
|
if (!netfront_tx_slot_available(queue)) |
|
netif_tx_stop_queue(netdev_get_tx_queue(dev, queue->id)); |
|
|
|
spin_unlock_irqrestore(&queue->tx_lock, flags); |
|
|
|
return NETDEV_TX_OK; |
|
|
|
drop: |
|
dev->stats.tx_dropped++; |
|
dev_kfree_skb_any(skb); |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
static int xennet_close(struct net_device *dev) |
|
{ |
|
struct netfront_info *np = netdev_priv(dev); |
|
unsigned int num_queues = dev->real_num_tx_queues; |
|
unsigned int i; |
|
struct netfront_queue *queue; |
|
netif_tx_stop_all_queues(np->netdev); |
|
for (i = 0; i < num_queues; ++i) { |
|
queue = &np->queues[i]; |
|
napi_disable(&queue->napi); |
|
} |
|
return 0; |
|
} |
|
|
|
static void xennet_move_rx_slot(struct netfront_queue *queue, struct sk_buff *skb, |
|
grant_ref_t ref) |
|
{ |
|
int new = xennet_rxidx(queue->rx.req_prod_pvt); |
|
|
|
BUG_ON(queue->rx_skbs[new]); |
|
queue->rx_skbs[new] = skb; |
|
queue->grant_rx_ref[new] = ref; |
|
RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->id = new; |
|
RING_GET_REQUEST(&queue->rx, queue->rx.req_prod_pvt)->gref = ref; |
|
queue->rx.req_prod_pvt++; |
|
} |
|
|
|
static int xennet_get_extras(struct netfront_queue *queue, |
|
struct xen_netif_extra_info *extras, |
|
RING_IDX rp) |
|
|
|
{ |
|
struct xen_netif_extra_info extra; |
|
struct device *dev = &queue->info->netdev->dev; |
|
RING_IDX cons = queue->rx.rsp_cons; |
|
int err = 0; |
|
|
|
do { |
|
struct sk_buff *skb; |
|
grant_ref_t ref; |
|
|
|
if (unlikely(cons + 1 == rp)) { |
|
if (net_ratelimit()) |
|
dev_warn(dev, "Missing extra info\n"); |
|
err = -EBADR; |
|
break; |
|
} |
|
|
|
RING_COPY_RESPONSE(&queue->rx, ++cons, &extra); |
|
|
|
if (unlikely(!extra.type || |
|
extra.type >= XEN_NETIF_EXTRA_TYPE_MAX)) { |
|
if (net_ratelimit()) |
|
dev_warn(dev, "Invalid extra type: %d\n", |
|
extra.type); |
|
err = -EINVAL; |
|
} else { |
|
extras[extra.type - 1] = extra; |
|
} |
|
|
|
skb = xennet_get_rx_skb(queue, cons); |
|
ref = xennet_get_rx_ref(queue, cons); |
|
xennet_move_rx_slot(queue, skb, ref); |
|
} while (extra.flags & XEN_NETIF_EXTRA_FLAG_MORE); |
|
|
|
queue->rx.rsp_cons = cons; |
|
return err; |
|
} |
|
|
|
static u32 xennet_run_xdp(struct netfront_queue *queue, struct page *pdata, |
|
struct xen_netif_rx_response *rx, struct bpf_prog *prog, |
|
struct xdp_buff *xdp, bool *need_xdp_flush) |
|
{ |
|
struct xdp_frame *xdpf; |
|
u32 len = rx->status; |
|
u32 act; |
|
int err; |
|
|
|
xdp_init_buff(xdp, XEN_PAGE_SIZE - XDP_PACKET_HEADROOM, |
|
&queue->xdp_rxq); |
|
xdp_prepare_buff(xdp, page_address(pdata), XDP_PACKET_HEADROOM, |
|
len, false); |
|
|
|
act = bpf_prog_run_xdp(prog, xdp); |
|
switch (act) { |
|
case XDP_TX: |
|
get_page(pdata); |
|
xdpf = xdp_convert_buff_to_frame(xdp); |
|
err = xennet_xdp_xmit(queue->info->netdev, 1, &xdpf, 0); |
|
if (unlikely(!err)) |
|
xdp_return_frame_rx_napi(xdpf); |
|
else if (unlikely(err < 0)) |
|
trace_xdp_exception(queue->info->netdev, prog, act); |
|
break; |
|
case XDP_REDIRECT: |
|
get_page(pdata); |
|
err = xdp_do_redirect(queue->info->netdev, xdp, prog); |
|
*need_xdp_flush = true; |
|
if (unlikely(err)) |
|
trace_xdp_exception(queue->info->netdev, prog, act); |
|
break; |
|
case XDP_PASS: |
|
case XDP_DROP: |
|
break; |
|
|
|
case XDP_ABORTED: |
|
trace_xdp_exception(queue->info->netdev, prog, act); |
|
break; |
|
|
|
default: |
|
bpf_warn_invalid_xdp_action(act); |
|
} |
|
|
|
return act; |
|
} |
|
|
|
static int xennet_get_responses(struct netfront_queue *queue, |
|
struct netfront_rx_info *rinfo, RING_IDX rp, |
|
struct sk_buff_head *list, |
|
bool *need_xdp_flush) |
|
{ |
|
struct xen_netif_rx_response *rx = &rinfo->rx, rx_local; |
|
int max = XEN_NETIF_NR_SLOTS_MIN + (rx->status <= RX_COPY_THRESHOLD); |
|
RING_IDX cons = queue->rx.rsp_cons; |
|
struct sk_buff *skb = xennet_get_rx_skb(queue, cons); |
|
struct xen_netif_extra_info *extras = rinfo->extras; |
|
grant_ref_t ref = xennet_get_rx_ref(queue, cons); |
|
struct device *dev = &queue->info->netdev->dev; |
|
struct bpf_prog *xdp_prog; |
|
struct xdp_buff xdp; |
|
unsigned long ret; |
|
int slots = 1; |
|
int err = 0; |
|
u32 verdict; |
|
|
|
if (rx->flags & XEN_NETRXF_extra_info) { |
|
err = xennet_get_extras(queue, extras, rp); |
|
if (!err) { |
|
if (extras[XEN_NETIF_EXTRA_TYPE_XDP - 1].type) { |
|
struct xen_netif_extra_info *xdp; |
|
|
|
xdp = &extras[XEN_NETIF_EXTRA_TYPE_XDP - 1]; |
|
rx->offset = xdp->u.xdp.headroom; |
|
} |
|
} |
|
cons = queue->rx.rsp_cons; |
|
} |
|
|
|
for (;;) { |
|
if (unlikely(rx->status < 0 || |
|
rx->offset + rx->status > XEN_PAGE_SIZE)) { |
|
if (net_ratelimit()) |
|
dev_warn(dev, "rx->offset: %u, size: %d\n", |
|
rx->offset, rx->status); |
|
xennet_move_rx_slot(queue, skb, ref); |
|
err = -EINVAL; |
|
goto next; |
|
} |
|
|
|
/* |
|
* This definitely indicates a bug, either in this driver or in |
|
* the backend driver. In future this should flag the bad |
|
* situation to the system controller to reboot the backend. |
|
*/ |
|
if (ref == GRANT_INVALID_REF) { |
|
if (net_ratelimit()) |
|
dev_warn(dev, "Bad rx response id %d.\n", |
|
rx->id); |
|
err = -EINVAL; |
|
goto next; |
|
} |
|
|
|
ret = gnttab_end_foreign_access_ref(ref, 0); |
|
BUG_ON(!ret); |
|
|
|
gnttab_release_grant_reference(&queue->gref_rx_head, ref); |
|
|
|
rcu_read_lock(); |
|
xdp_prog = rcu_dereference(queue->xdp_prog); |
|
if (xdp_prog) { |
|
if (!(rx->flags & XEN_NETRXF_more_data)) { |
|
/* currently only a single page contains data */ |
|
verdict = xennet_run_xdp(queue, |
|
skb_frag_page(&skb_shinfo(skb)->frags[0]), |
|
rx, xdp_prog, &xdp, need_xdp_flush); |
|
if (verdict != XDP_PASS) |
|
err = -EINVAL; |
|
} else { |
|
/* drop the frame */ |
|
err = -EINVAL; |
|
} |
|
} |
|
rcu_read_unlock(); |
|
next: |
|
__skb_queue_tail(list, skb); |
|
if (!(rx->flags & XEN_NETRXF_more_data)) |
|
break; |
|
|
|
if (cons + slots == rp) { |
|
if (net_ratelimit()) |
|
dev_warn(dev, "Need more slots\n"); |
|
err = -ENOENT; |
|
break; |
|
} |
|
|
|
RING_COPY_RESPONSE(&queue->rx, cons + slots, &rx_local); |
|
rx = &rx_local; |
|
skb = xennet_get_rx_skb(queue, cons + slots); |
|
ref = xennet_get_rx_ref(queue, cons + slots); |
|
slots++; |
|
} |
|
|
|
if (unlikely(slots > max)) { |
|
if (net_ratelimit()) |
|
dev_warn(dev, "Too many slots\n"); |
|
err = -E2BIG; |
|
} |
|
|
|
if (unlikely(err)) |
|
queue->rx.rsp_cons = cons + slots; |
|
|
|
return err; |
|
} |
|
|
|
static int xennet_set_skb_gso(struct sk_buff *skb, |
|
struct xen_netif_extra_info *gso) |
|
{ |
|
if (!gso->u.gso.size) { |
|
if (net_ratelimit()) |
|
pr_warn("GSO size must not be zero\n"); |
|
return -EINVAL; |
|
} |
|
|
|
if (gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV4 && |
|
gso->u.gso.type != XEN_NETIF_GSO_TYPE_TCPV6) { |
|
if (net_ratelimit()) |
|
pr_warn("Bad GSO type %d\n", gso->u.gso.type); |
|
return -EINVAL; |
|
} |
|
|
|
skb_shinfo(skb)->gso_size = gso->u.gso.size; |
|
skb_shinfo(skb)->gso_type = |
|
(gso->u.gso.type == XEN_NETIF_GSO_TYPE_TCPV4) ? |
|
SKB_GSO_TCPV4 : |
|
SKB_GSO_TCPV6; |
|
|
|
/* Header must be checked, and gso_segs computed. */ |
|
skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; |
|
skb_shinfo(skb)->gso_segs = 0; |
|
|
|
return 0; |
|
} |
|
|
|
static int xennet_fill_frags(struct netfront_queue *queue, |
|
struct sk_buff *skb, |
|
struct sk_buff_head *list) |
|
{ |
|
RING_IDX cons = queue->rx.rsp_cons; |
|
struct sk_buff *nskb; |
|
|
|
while ((nskb = __skb_dequeue(list))) { |
|
struct xen_netif_rx_response rx; |
|
skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0]; |
|
|
|
RING_COPY_RESPONSE(&queue->rx, ++cons, &rx); |
|
|
|
if (skb_shinfo(skb)->nr_frags == MAX_SKB_FRAGS) { |
|
unsigned int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
|
|
|
BUG_ON(pull_to < skb_headlen(skb)); |
|
__pskb_pull_tail(skb, pull_to - skb_headlen(skb)); |
|
} |
|
if (unlikely(skb_shinfo(skb)->nr_frags >= MAX_SKB_FRAGS)) { |
|
queue->rx.rsp_cons = ++cons + skb_queue_len(list); |
|
kfree_skb(nskb); |
|
return -ENOENT; |
|
} |
|
|
|
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, |
|
skb_frag_page(nfrag), |
|
rx.offset, rx.status, PAGE_SIZE); |
|
|
|
skb_shinfo(nskb)->nr_frags = 0; |
|
kfree_skb(nskb); |
|
} |
|
|
|
queue->rx.rsp_cons = cons; |
|
|
|
return 0; |
|
} |
|
|
|
static int checksum_setup(struct net_device *dev, struct sk_buff *skb) |
|
{ |
|
bool recalculate_partial_csum = false; |
|
|
|
/* |
|
* A GSO SKB must be CHECKSUM_PARTIAL. However some buggy |
|
* peers can fail to set NETRXF_csum_blank when sending a GSO |
|
* frame. In this case force the SKB to CHECKSUM_PARTIAL and |
|
* recalculate the partial checksum. |
|
*/ |
|
if (skb->ip_summed != CHECKSUM_PARTIAL && skb_is_gso(skb)) { |
|
struct netfront_info *np = netdev_priv(dev); |
|
atomic_inc(&np->rx_gso_checksum_fixup); |
|
skb->ip_summed = CHECKSUM_PARTIAL; |
|
recalculate_partial_csum = true; |
|
} |
|
|
|
/* A non-CHECKSUM_PARTIAL SKB does not require setup. */ |
|
if (skb->ip_summed != CHECKSUM_PARTIAL) |
|
return 0; |
|
|
|
return skb_checksum_setup(skb, recalculate_partial_csum); |
|
} |
|
|
|
static int handle_incoming_queue(struct netfront_queue *queue, |
|
struct sk_buff_head *rxq) |
|
{ |
|
struct netfront_stats *rx_stats = this_cpu_ptr(queue->info->rx_stats); |
|
int packets_dropped = 0; |
|
struct sk_buff *skb; |
|
|
|
while ((skb = __skb_dequeue(rxq)) != NULL) { |
|
int pull_to = NETFRONT_SKB_CB(skb)->pull_to; |
|
|
|
if (pull_to > skb_headlen(skb)) |
|
__pskb_pull_tail(skb, pull_to - skb_headlen(skb)); |
|
|
|
/* Ethernet work: Delayed to here as it peeks the header. */ |
|
skb->protocol = eth_type_trans(skb, queue->info->netdev); |
|
skb_reset_network_header(skb); |
|
|
|
if (checksum_setup(queue->info->netdev, skb)) { |
|
kfree_skb(skb); |
|
packets_dropped++; |
|
queue->info->netdev->stats.rx_errors++; |
|
continue; |
|
} |
|
|
|
u64_stats_update_begin(&rx_stats->syncp); |
|
rx_stats->packets++; |
|
rx_stats->bytes += skb->len; |
|
u64_stats_update_end(&rx_stats->syncp); |
|
|
|
/* Pass it up. */ |
|
napi_gro_receive(&queue->napi, skb); |
|
} |
|
|
|
return packets_dropped; |
|
} |
|
|
|
static int xennet_poll(struct napi_struct *napi, int budget) |
|
{ |
|
struct netfront_queue *queue = container_of(napi, struct netfront_queue, napi); |
|
struct net_device *dev = queue->info->netdev; |
|
struct sk_buff *skb; |
|
struct netfront_rx_info rinfo; |
|
struct xen_netif_rx_response *rx = &rinfo.rx; |
|
struct xen_netif_extra_info *extras = rinfo.extras; |
|
RING_IDX i, rp; |
|
int work_done; |
|
struct sk_buff_head rxq; |
|
struct sk_buff_head errq; |
|
struct sk_buff_head tmpq; |
|
int err; |
|
bool need_xdp_flush = false; |
|
|
|
spin_lock(&queue->rx_lock); |
|
|
|
skb_queue_head_init(&rxq); |
|
skb_queue_head_init(&errq); |
|
skb_queue_head_init(&tmpq); |
|
|
|
rp = queue->rx.sring->rsp_prod; |
|
if (RING_RESPONSE_PROD_OVERFLOW(&queue->rx, rp)) { |
|
dev_alert(&dev->dev, "Illegal number of responses %u\n", |
|
rp - queue->rx.rsp_cons); |
|
queue->info->broken = true; |
|
spin_unlock(&queue->rx_lock); |
|
return 0; |
|
} |
|
rmb(); /* Ensure we see queued responses up to 'rp'. */ |
|
|
|
i = queue->rx.rsp_cons; |
|
work_done = 0; |
|
while ((i != rp) && (work_done < budget)) { |
|
RING_COPY_RESPONSE(&queue->rx, i, rx); |
|
memset(extras, 0, sizeof(rinfo.extras)); |
|
|
|
err = xennet_get_responses(queue, &rinfo, rp, &tmpq, |
|
&need_xdp_flush); |
|
|
|
if (unlikely(err)) { |
|
err: |
|
while ((skb = __skb_dequeue(&tmpq))) |
|
__skb_queue_tail(&errq, skb); |
|
dev->stats.rx_errors++; |
|
i = queue->rx.rsp_cons; |
|
continue; |
|
} |
|
|
|
skb = __skb_dequeue(&tmpq); |
|
|
|
if (extras[XEN_NETIF_EXTRA_TYPE_GSO - 1].type) { |
|
struct xen_netif_extra_info *gso; |
|
gso = &extras[XEN_NETIF_EXTRA_TYPE_GSO - 1]; |
|
|
|
if (unlikely(xennet_set_skb_gso(skb, gso))) { |
|
__skb_queue_head(&tmpq, skb); |
|
queue->rx.rsp_cons += skb_queue_len(&tmpq); |
|
goto err; |
|
} |
|
} |
|
|
|
NETFRONT_SKB_CB(skb)->pull_to = rx->status; |
|
if (NETFRONT_SKB_CB(skb)->pull_to > RX_COPY_THRESHOLD) |
|
NETFRONT_SKB_CB(skb)->pull_to = RX_COPY_THRESHOLD; |
|
|
|
skb_frag_off_set(&skb_shinfo(skb)->frags[0], rx->offset); |
|
skb_frag_size_set(&skb_shinfo(skb)->frags[0], rx->status); |
|
skb->data_len = rx->status; |
|
skb->len += rx->status; |
|
|
|
if (unlikely(xennet_fill_frags(queue, skb, &tmpq))) |
|
goto err; |
|
|
|
if (rx->flags & XEN_NETRXF_csum_blank) |
|
skb->ip_summed = CHECKSUM_PARTIAL; |
|
else if (rx->flags & XEN_NETRXF_data_validated) |
|
skb->ip_summed = CHECKSUM_UNNECESSARY; |
|
|
|
__skb_queue_tail(&rxq, skb); |
|
|
|
i = ++queue->rx.rsp_cons; |
|
work_done++; |
|
} |
|
if (need_xdp_flush) |
|
xdp_do_flush(); |
|
|
|
__skb_queue_purge(&errq); |
|
|
|
work_done -= handle_incoming_queue(queue, &rxq); |
|
|
|
xennet_alloc_rx_buffers(queue); |
|
|
|
if (work_done < budget) { |
|
int more_to_do = 0; |
|
|
|
napi_complete_done(napi, work_done); |
|
|
|
RING_FINAL_CHECK_FOR_RESPONSES(&queue->rx, more_to_do); |
|
if (more_to_do) |
|
napi_schedule(napi); |
|
} |
|
|
|
spin_unlock(&queue->rx_lock); |
|
|
|
return work_done; |
|
} |
|
|
|
static int xennet_change_mtu(struct net_device *dev, int mtu) |
|
{ |
|
int max = xennet_can_sg(dev) ? XEN_NETIF_MAX_TX_SIZE : ETH_DATA_LEN; |
|
|
|
if (mtu > max) |
|
return -EINVAL; |
|
dev->mtu = mtu; |
|
return 0; |
|
} |
|
|
|
static void xennet_get_stats64(struct net_device *dev, |
|
struct rtnl_link_stats64 *tot) |
|
{ |
|
struct netfront_info *np = netdev_priv(dev); |
|
int cpu; |
|
|
|
for_each_possible_cpu(cpu) { |
|
struct netfront_stats *rx_stats = per_cpu_ptr(np->rx_stats, cpu); |
|
struct netfront_stats *tx_stats = per_cpu_ptr(np->tx_stats, cpu); |
|
u64 rx_packets, rx_bytes, tx_packets, tx_bytes; |
|
unsigned int start; |
|
|
|
do { |
|
start = u64_stats_fetch_begin_irq(&tx_stats->syncp); |
|
tx_packets = tx_stats->packets; |
|
tx_bytes = tx_stats->bytes; |
|
} while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start)); |
|
|
|
do { |
|
start = u64_stats_fetch_begin_irq(&rx_stats->syncp); |
|
rx_packets = rx_stats->packets; |
|
rx_bytes = rx_stats->bytes; |
|
} while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start)); |
|
|
|
tot->rx_packets += rx_packets; |
|
tot->tx_packets += tx_packets; |
|
tot->rx_bytes += rx_bytes; |
|
tot->tx_bytes += tx_bytes; |
|
} |
|
|
|
tot->rx_errors = dev->stats.rx_errors; |
|
tot->tx_dropped = dev->stats.tx_dropped; |
|
} |
|
|
|
static void xennet_release_tx_bufs(struct netfront_queue *queue) |
|
{ |
|
struct sk_buff *skb; |
|
int i; |
|
|
|
for (i = 0; i < NET_TX_RING_SIZE; i++) { |
|
/* Skip over entries which are actually freelist references */ |
|
if (!queue->tx_skbs[i]) |
|
continue; |
|
|
|
skb = queue->tx_skbs[i]; |
|
queue->tx_skbs[i] = NULL; |
|
get_page(queue->grant_tx_page[i]); |
|
gnttab_end_foreign_access(queue->grant_tx_ref[i], |
|
GNTMAP_readonly, |
|
(unsigned long)page_address(queue->grant_tx_page[i])); |
|
queue->grant_tx_page[i] = NULL; |
|
queue->grant_tx_ref[i] = GRANT_INVALID_REF; |
|
add_id_to_list(&queue->tx_skb_freelist, queue->tx_link, i); |
|
dev_kfree_skb_irq(skb); |
|
} |
|
} |
|
|
|
static void xennet_release_rx_bufs(struct netfront_queue *queue) |
|
{ |
|
int id, ref; |
|
|
|
spin_lock_bh(&queue->rx_lock); |
|
|
|
for (id = 0; id < NET_RX_RING_SIZE; id++) { |
|
struct sk_buff *skb; |
|
struct page *page; |
|
|
|
skb = queue->rx_skbs[id]; |
|
if (!skb) |
|
continue; |
|
|
|
ref = queue->grant_rx_ref[id]; |
|
if (ref == GRANT_INVALID_REF) |
|
continue; |
|
|
|
page = skb_frag_page(&skb_shinfo(skb)->frags[0]); |
|
|
|
/* gnttab_end_foreign_access() needs a page ref until |
|
* foreign access is ended (which may be deferred). |
|
*/ |
|
get_page(page); |
|
gnttab_end_foreign_access(ref, 0, |
|
(unsigned long)page_address(page)); |
|
queue->grant_rx_ref[id] = GRANT_INVALID_REF; |
|
|
|
kfree_skb(skb); |
|
} |
|
|
|
spin_unlock_bh(&queue->rx_lock); |
|
} |
|
|
|
static netdev_features_t xennet_fix_features(struct net_device *dev, |
|
netdev_features_t features) |
|
{ |
|
struct netfront_info *np = netdev_priv(dev); |
|
|
|
if (features & NETIF_F_SG && |
|
!xenbus_read_unsigned(np->xbdev->otherend, "feature-sg", 0)) |
|
features &= ~NETIF_F_SG; |
|
|
|
if (features & NETIF_F_IPV6_CSUM && |
|
!xenbus_read_unsigned(np->xbdev->otherend, |
|
"feature-ipv6-csum-offload", 0)) |
|
features &= ~NETIF_F_IPV6_CSUM; |
|
|
|
if (features & NETIF_F_TSO && |
|
!xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv4", 0)) |
|
features &= ~NETIF_F_TSO; |
|
|
|
if (features & NETIF_F_TSO6 && |
|
!xenbus_read_unsigned(np->xbdev->otherend, "feature-gso-tcpv6", 0)) |
|
features &= ~NETIF_F_TSO6; |
|
|
|
return features; |
|
} |
|
|
|
static int xennet_set_features(struct net_device *dev, |
|
netdev_features_t features) |
|
{ |
|
if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN) { |
|
netdev_info(dev, "Reducing MTU because no SG offload"); |
|
dev->mtu = ETH_DATA_LEN; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static irqreturn_t xennet_tx_interrupt(int irq, void *dev_id) |
|
{ |
|
struct netfront_queue *queue = dev_id; |
|
unsigned long flags; |
|
|
|
if (queue->info->broken) |
|
return IRQ_HANDLED; |
|
|
|
spin_lock_irqsave(&queue->tx_lock, flags); |
|
xennet_tx_buf_gc(queue); |
|
spin_unlock_irqrestore(&queue->tx_lock, flags); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static irqreturn_t xennet_rx_interrupt(int irq, void *dev_id) |
|
{ |
|
struct netfront_queue *queue = dev_id; |
|
struct net_device *dev = queue->info->netdev; |
|
|
|
if (queue->info->broken) |
|
return IRQ_HANDLED; |
|
|
|
if (likely(netif_carrier_ok(dev) && |
|
RING_HAS_UNCONSUMED_RESPONSES(&queue->rx))) |
|
napi_schedule(&queue->napi); |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static irqreturn_t xennet_interrupt(int irq, void *dev_id) |
|
{ |
|
xennet_tx_interrupt(irq, dev_id); |
|
xennet_rx_interrupt(irq, dev_id); |
|
return IRQ_HANDLED; |
|
} |
|
|
|
#ifdef CONFIG_NET_POLL_CONTROLLER |
|
static void xennet_poll_controller(struct net_device *dev) |
|
{ |
|
/* Poll each queue */ |
|
struct netfront_info *info = netdev_priv(dev); |
|
unsigned int num_queues = dev->real_num_tx_queues; |
|
unsigned int i; |
|
|
|
if (info->broken) |
|
return; |
|
|
|
for (i = 0; i < num_queues; ++i) |
|
xennet_interrupt(0, &info->queues[i]); |
|
} |
|
#endif |
|
|
|
#define NETBACK_XDP_HEADROOM_DISABLE 0 |
|
#define NETBACK_XDP_HEADROOM_ENABLE 1 |
|
|
|
static int talk_to_netback_xdp(struct netfront_info *np, int xdp) |
|
{ |
|
int err; |
|
unsigned short headroom; |
|
|
|
headroom = xdp ? XDP_PACKET_HEADROOM : 0; |
|
err = xenbus_printf(XBT_NIL, np->xbdev->nodename, |
|
"xdp-headroom", "%hu", |
|
headroom); |
|
if (err) |
|
pr_warn("Error writing xdp-headroom\n"); |
|
|
|
return err; |
|
} |
|
|
|
static int xennet_xdp_set(struct net_device *dev, struct bpf_prog *prog, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
unsigned long max_mtu = XEN_PAGE_SIZE - XDP_PACKET_HEADROOM; |
|
struct netfront_info *np = netdev_priv(dev); |
|
struct bpf_prog *old_prog; |
|
unsigned int i, err; |
|
|
|
if (dev->mtu > max_mtu) { |
|
netdev_warn(dev, "XDP requires MTU less than %lu\n", max_mtu); |
|
return -EINVAL; |
|
} |
|
|
|
if (!np->netback_has_xdp_headroom) |
|
return 0; |
|
|
|
xenbus_switch_state(np->xbdev, XenbusStateReconfiguring); |
|
|
|
err = talk_to_netback_xdp(np, prog ? NETBACK_XDP_HEADROOM_ENABLE : |
|
NETBACK_XDP_HEADROOM_DISABLE); |
|
if (err) |
|
return err; |
|
|
|
/* avoid the race with XDP headroom adjustment */ |
|
wait_event(module_wq, |
|
xenbus_read_driver_state(np->xbdev->otherend) == |
|
XenbusStateReconfigured); |
|
np->netfront_xdp_enabled = true; |
|
|
|
old_prog = rtnl_dereference(np->queues[0].xdp_prog); |
|
|
|
if (prog) |
|
bpf_prog_add(prog, dev->real_num_tx_queues); |
|
|
|
for (i = 0; i < dev->real_num_tx_queues; ++i) |
|
rcu_assign_pointer(np->queues[i].xdp_prog, prog); |
|
|
|
if (old_prog) |
|
for (i = 0; i < dev->real_num_tx_queues; ++i) |
|
bpf_prog_put(old_prog); |
|
|
|
xenbus_switch_state(np->xbdev, XenbusStateConnected); |
|
|
|
return 0; |
|
} |
|
|
|
static int xennet_xdp(struct net_device *dev, struct netdev_bpf *xdp) |
|
{ |
|
struct netfront_info *np = netdev_priv(dev); |
|
|
|
if (np->broken) |
|
return -ENODEV; |
|
|
|
switch (xdp->command) { |
|
case XDP_SETUP_PROG: |
|
return xennet_xdp_set(dev, xdp->prog, xdp->extack); |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static const struct net_device_ops xennet_netdev_ops = { |
|
.ndo_open = xennet_open, |
|
.ndo_stop = xennet_close, |
|
.ndo_start_xmit = xennet_start_xmit, |
|
.ndo_change_mtu = xennet_change_mtu, |
|
.ndo_get_stats64 = xennet_get_stats64, |
|
.ndo_set_mac_address = eth_mac_addr, |
|
.ndo_validate_addr = eth_validate_addr, |
|
.ndo_fix_features = xennet_fix_features, |
|
.ndo_set_features = xennet_set_features, |
|
.ndo_select_queue = xennet_select_queue, |
|
.ndo_bpf = xennet_xdp, |
|
.ndo_xdp_xmit = xennet_xdp_xmit, |
|
#ifdef CONFIG_NET_POLL_CONTROLLER |
|
.ndo_poll_controller = xennet_poll_controller, |
|
#endif |
|
}; |
|
|
|
static void xennet_free_netdev(struct net_device *netdev) |
|
{ |
|
struct netfront_info *np = netdev_priv(netdev); |
|
|
|
free_percpu(np->rx_stats); |
|
free_percpu(np->tx_stats); |
|
free_netdev(netdev); |
|
} |
|
|
|
static struct net_device *xennet_create_dev(struct xenbus_device *dev) |
|
{ |
|
int err; |
|
struct net_device *netdev; |
|
struct netfront_info *np; |
|
|
|
netdev = alloc_etherdev_mq(sizeof(struct netfront_info), xennet_max_queues); |
|
if (!netdev) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
np = netdev_priv(netdev); |
|
np->xbdev = dev; |
|
|
|
np->queues = NULL; |
|
|
|
err = -ENOMEM; |
|
np->rx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); |
|
if (np->rx_stats == NULL) |
|
goto exit; |
|
np->tx_stats = netdev_alloc_pcpu_stats(struct netfront_stats); |
|
if (np->tx_stats == NULL) |
|
goto exit; |
|
|
|
netdev->netdev_ops = &xennet_netdev_ops; |
|
|
|
netdev->features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM | |
|
NETIF_F_GSO_ROBUST; |
|
netdev->hw_features = NETIF_F_SG | |
|
NETIF_F_IPV6_CSUM | |
|
NETIF_F_TSO | NETIF_F_TSO6; |
|
|
|
/* |
|
* Assume that all hw features are available for now. This set |
|
* will be adjusted by the call to netdev_update_features() in |
|
* xennet_connect() which is the earliest point where we can |
|
* negotiate with the backend regarding supported features. |
|
*/ |
|
netdev->features |= netdev->hw_features; |
|
|
|
netdev->ethtool_ops = &xennet_ethtool_ops; |
|
netdev->min_mtu = ETH_MIN_MTU; |
|
netdev->max_mtu = XEN_NETIF_MAX_TX_SIZE; |
|
SET_NETDEV_DEV(netdev, &dev->dev); |
|
|
|
np->netdev = netdev; |
|
np->netfront_xdp_enabled = false; |
|
|
|
netif_carrier_off(netdev); |
|
|
|
do { |
|
xenbus_switch_state(dev, XenbusStateInitialising); |
|
err = wait_event_timeout(module_wq, |
|
xenbus_read_driver_state(dev->otherend) != |
|
XenbusStateClosed && |
|
xenbus_read_driver_state(dev->otherend) != |
|
XenbusStateUnknown, XENNET_TIMEOUT); |
|
} while (!err); |
|
|
|
return netdev; |
|
|
|
exit: |
|
xennet_free_netdev(netdev); |
|
return ERR_PTR(err); |
|
} |
|
|
|
/* |
|
* Entry point to this code when a new device is created. Allocate the basic |
|
* structures and the ring buffers for communication with the backend, and |
|
* inform the backend of the appropriate details for those. |
|
*/ |
|
static int netfront_probe(struct xenbus_device *dev, |
|
const struct xenbus_device_id *id) |
|
{ |
|
int err; |
|
struct net_device *netdev; |
|
struct netfront_info *info; |
|
|
|
netdev = xennet_create_dev(dev); |
|
if (IS_ERR(netdev)) { |
|
err = PTR_ERR(netdev); |
|
xenbus_dev_fatal(dev, err, "creating netdev"); |
|
return err; |
|
} |
|
|
|
info = netdev_priv(netdev); |
|
dev_set_drvdata(&dev->dev, info); |
|
#ifdef CONFIG_SYSFS |
|
info->netdev->sysfs_groups[0] = &xennet_dev_group; |
|
#endif |
|
|
|
return 0; |
|
} |
|
|
|
static void xennet_end_access(int ref, void *page) |
|
{ |
|
/* This frees the page as a side-effect */ |
|
if (ref != GRANT_INVALID_REF) |
|
gnttab_end_foreign_access(ref, 0, (unsigned long)page); |
|
} |
|
|
|
static void xennet_disconnect_backend(struct netfront_info *info) |
|
{ |
|
unsigned int i = 0; |
|
unsigned int num_queues = info->netdev->real_num_tx_queues; |
|
|
|
netif_carrier_off(info->netdev); |
|
|
|
for (i = 0; i < num_queues && info->queues; ++i) { |
|
struct netfront_queue *queue = &info->queues[i]; |
|
|
|
del_timer_sync(&queue->rx_refill_timer); |
|
|
|
if (queue->tx_irq && (queue->tx_irq == queue->rx_irq)) |
|
unbind_from_irqhandler(queue->tx_irq, queue); |
|
if (queue->tx_irq && (queue->tx_irq != queue->rx_irq)) { |
|
unbind_from_irqhandler(queue->tx_irq, queue); |
|
unbind_from_irqhandler(queue->rx_irq, queue); |
|
} |
|
queue->tx_evtchn = queue->rx_evtchn = 0; |
|
queue->tx_irq = queue->rx_irq = 0; |
|
|
|
if (netif_running(info->netdev)) |
|
napi_synchronize(&queue->napi); |
|
|
|
xennet_release_tx_bufs(queue); |
|
xennet_release_rx_bufs(queue); |
|
gnttab_free_grant_references(queue->gref_tx_head); |
|
gnttab_free_grant_references(queue->gref_rx_head); |
|
|
|
/* End access and free the pages */ |
|
xennet_end_access(queue->tx_ring_ref, queue->tx.sring); |
|
xennet_end_access(queue->rx_ring_ref, queue->rx.sring); |
|
|
|
queue->tx_ring_ref = GRANT_INVALID_REF; |
|
queue->rx_ring_ref = GRANT_INVALID_REF; |
|
queue->tx.sring = NULL; |
|
queue->rx.sring = NULL; |
|
|
|
page_pool_destroy(queue->page_pool); |
|
} |
|
} |
|
|
|
/* |
|
* We are reconnecting to the backend, due to a suspend/resume, or a backend |
|
* driver restart. We tear down our netif structure and recreate it, but |
|
* leave the device-layer structures intact so that this is transparent to the |
|
* rest of the kernel. |
|
*/ |
|
static int netfront_resume(struct xenbus_device *dev) |
|
{ |
|
struct netfront_info *info = dev_get_drvdata(&dev->dev); |
|
|
|
dev_dbg(&dev->dev, "%s\n", dev->nodename); |
|
|
|
xennet_disconnect_backend(info); |
|
return 0; |
|
} |
|
|
|
static int xen_net_read_mac(struct xenbus_device *dev, u8 mac[]) |
|
{ |
|
char *s, *e, *macstr; |
|
int i; |
|
|
|
macstr = s = xenbus_read(XBT_NIL, dev->nodename, "mac", NULL); |
|
if (IS_ERR(macstr)) |
|
return PTR_ERR(macstr); |
|
|
|
for (i = 0; i < ETH_ALEN; i++) { |
|
mac[i] = simple_strtoul(s, &e, 16); |
|
if ((s == e) || (*e != ((i == ETH_ALEN-1) ? '\0' : ':'))) { |
|
kfree(macstr); |
|
return -ENOENT; |
|
} |
|
s = e+1; |
|
} |
|
|
|
kfree(macstr); |
|
return 0; |
|
} |
|
|
|
static int setup_netfront_single(struct netfront_queue *queue) |
|
{ |
|
int err; |
|
|
|
err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); |
|
if (err < 0) |
|
goto fail; |
|
|
|
err = bind_evtchn_to_irqhandler(queue->tx_evtchn, |
|
xennet_interrupt, |
|
0, queue->info->netdev->name, queue); |
|
if (err < 0) |
|
goto bind_fail; |
|
queue->rx_evtchn = queue->tx_evtchn; |
|
queue->rx_irq = queue->tx_irq = err; |
|
|
|
return 0; |
|
|
|
bind_fail: |
|
xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); |
|
queue->tx_evtchn = 0; |
|
fail: |
|
return err; |
|
} |
|
|
|
static int setup_netfront_split(struct netfront_queue *queue) |
|
{ |
|
int err; |
|
|
|
err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->tx_evtchn); |
|
if (err < 0) |
|
goto fail; |
|
err = xenbus_alloc_evtchn(queue->info->xbdev, &queue->rx_evtchn); |
|
if (err < 0) |
|
goto alloc_rx_evtchn_fail; |
|
|
|
snprintf(queue->tx_irq_name, sizeof(queue->tx_irq_name), |
|
"%s-tx", queue->name); |
|
err = bind_evtchn_to_irqhandler(queue->tx_evtchn, |
|
xennet_tx_interrupt, |
|
0, queue->tx_irq_name, queue); |
|
if (err < 0) |
|
goto bind_tx_fail; |
|
queue->tx_irq = err; |
|
|
|
snprintf(queue->rx_irq_name, sizeof(queue->rx_irq_name), |
|
"%s-rx", queue->name); |
|
err = bind_evtchn_to_irqhandler(queue->rx_evtchn, |
|
xennet_rx_interrupt, |
|
0, queue->rx_irq_name, queue); |
|
if (err < 0) |
|
goto bind_rx_fail; |
|
queue->rx_irq = err; |
|
|
|
return 0; |
|
|
|
bind_rx_fail: |
|
unbind_from_irqhandler(queue->tx_irq, queue); |
|
queue->tx_irq = 0; |
|
bind_tx_fail: |
|
xenbus_free_evtchn(queue->info->xbdev, queue->rx_evtchn); |
|
queue->rx_evtchn = 0; |
|
alloc_rx_evtchn_fail: |
|
xenbus_free_evtchn(queue->info->xbdev, queue->tx_evtchn); |
|
queue->tx_evtchn = 0; |
|
fail: |
|
return err; |
|
} |
|
|
|
static int setup_netfront(struct xenbus_device *dev, |
|
struct netfront_queue *queue, unsigned int feature_split_evtchn) |
|
{ |
|
struct xen_netif_tx_sring *txs; |
|
struct xen_netif_rx_sring *rxs; |
|
grant_ref_t gref; |
|
int err; |
|
|
|
queue->tx_ring_ref = GRANT_INVALID_REF; |
|
queue->rx_ring_ref = GRANT_INVALID_REF; |
|
queue->rx.sring = NULL; |
|
queue->tx.sring = NULL; |
|
|
|
txs = (struct xen_netif_tx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
|
if (!txs) { |
|
err = -ENOMEM; |
|
xenbus_dev_fatal(dev, err, "allocating tx ring page"); |
|
goto fail; |
|
} |
|
SHARED_RING_INIT(txs); |
|
FRONT_RING_INIT(&queue->tx, txs, XEN_PAGE_SIZE); |
|
|
|
err = xenbus_grant_ring(dev, txs, 1, &gref); |
|
if (err < 0) |
|
goto grant_tx_ring_fail; |
|
queue->tx_ring_ref = gref; |
|
|
|
rxs = (struct xen_netif_rx_sring *)get_zeroed_page(GFP_NOIO | __GFP_HIGH); |
|
if (!rxs) { |
|
err = -ENOMEM; |
|
xenbus_dev_fatal(dev, err, "allocating rx ring page"); |
|
goto alloc_rx_ring_fail; |
|
} |
|
SHARED_RING_INIT(rxs); |
|
FRONT_RING_INIT(&queue->rx, rxs, XEN_PAGE_SIZE); |
|
|
|
err = xenbus_grant_ring(dev, rxs, 1, &gref); |
|
if (err < 0) |
|
goto grant_rx_ring_fail; |
|
queue->rx_ring_ref = gref; |
|
|
|
if (feature_split_evtchn) |
|
err = setup_netfront_split(queue); |
|
/* setup single event channel if |
|
* a) feature-split-event-channels == 0 |
|
* b) feature-split-event-channels == 1 but failed to setup |
|
*/ |
|
if (!feature_split_evtchn || err) |
|
err = setup_netfront_single(queue); |
|
|
|
if (err) |
|
goto alloc_evtchn_fail; |
|
|
|
return 0; |
|
|
|
/* If we fail to setup netfront, it is safe to just revoke access to |
|
* granted pages because backend is not accessing it at this point. |
|
*/ |
|
alloc_evtchn_fail: |
|
gnttab_end_foreign_access_ref(queue->rx_ring_ref, 0); |
|
grant_rx_ring_fail: |
|
free_page((unsigned long)rxs); |
|
alloc_rx_ring_fail: |
|
gnttab_end_foreign_access_ref(queue->tx_ring_ref, 0); |
|
grant_tx_ring_fail: |
|
free_page((unsigned long)txs); |
|
fail: |
|
return err; |
|
} |
|
|
|
/* Queue-specific initialisation |
|
* This used to be done in xennet_create_dev() but must now |
|
* be run per-queue. |
|
*/ |
|
static int xennet_init_queue(struct netfront_queue *queue) |
|
{ |
|
unsigned short i; |
|
int err = 0; |
|
char *devid; |
|
|
|
spin_lock_init(&queue->tx_lock); |
|
spin_lock_init(&queue->rx_lock); |
|
|
|
timer_setup(&queue->rx_refill_timer, rx_refill_timeout, 0); |
|
|
|
devid = strrchr(queue->info->xbdev->nodename, '/') + 1; |
|
snprintf(queue->name, sizeof(queue->name), "vif%s-q%u", |
|
devid, queue->id); |
|
|
|
/* Initialise tx_skb_freelist as a free chain containing every entry. */ |
|
queue->tx_skb_freelist = 0; |
|
queue->tx_pend_queue = TX_LINK_NONE; |
|
for (i = 0; i < NET_TX_RING_SIZE; i++) { |
|
queue->tx_link[i] = i + 1; |
|
queue->grant_tx_ref[i] = GRANT_INVALID_REF; |
|
queue->grant_tx_page[i] = NULL; |
|
} |
|
queue->tx_link[NET_TX_RING_SIZE - 1] = TX_LINK_NONE; |
|
|
|
/* Clear out rx_skbs */ |
|
for (i = 0; i < NET_RX_RING_SIZE; i++) { |
|
queue->rx_skbs[i] = NULL; |
|
queue->grant_rx_ref[i] = GRANT_INVALID_REF; |
|
} |
|
|
|
/* A grant for every tx ring slot */ |
|
if (gnttab_alloc_grant_references(NET_TX_RING_SIZE, |
|
&queue->gref_tx_head) < 0) { |
|
pr_alert("can't alloc tx grant refs\n"); |
|
err = -ENOMEM; |
|
goto exit; |
|
} |
|
|
|
/* A grant for every rx ring slot */ |
|
if (gnttab_alloc_grant_references(NET_RX_RING_SIZE, |
|
&queue->gref_rx_head) < 0) { |
|
pr_alert("can't alloc rx grant refs\n"); |
|
err = -ENOMEM; |
|
goto exit_free_tx; |
|
} |
|
|
|
return 0; |
|
|
|
exit_free_tx: |
|
gnttab_free_grant_references(queue->gref_tx_head); |
|
exit: |
|
return err; |
|
} |
|
|
|
static int write_queue_xenstore_keys(struct netfront_queue *queue, |
|
struct xenbus_transaction *xbt, int write_hierarchical) |
|
{ |
|
/* Write the queue-specific keys into XenStore in the traditional |
|
* way for a single queue, or in a queue subkeys for multiple |
|
* queues. |
|
*/ |
|
struct xenbus_device *dev = queue->info->xbdev; |
|
int err; |
|
const char *message; |
|
char *path; |
|
size_t pathsize; |
|
|
|
/* Choose the correct place to write the keys */ |
|
if (write_hierarchical) { |
|
pathsize = strlen(dev->nodename) + 10; |
|
path = kzalloc(pathsize, GFP_KERNEL); |
|
if (!path) { |
|
err = -ENOMEM; |
|
message = "out of memory while writing ring references"; |
|
goto error; |
|
} |
|
snprintf(path, pathsize, "%s/queue-%u", |
|
dev->nodename, queue->id); |
|
} else { |
|
path = (char *)dev->nodename; |
|
} |
|
|
|
/* Write ring references */ |
|
err = xenbus_printf(*xbt, path, "tx-ring-ref", "%u", |
|
queue->tx_ring_ref); |
|
if (err) { |
|
message = "writing tx-ring-ref"; |
|
goto error; |
|
} |
|
|
|
err = xenbus_printf(*xbt, path, "rx-ring-ref", "%u", |
|
queue->rx_ring_ref); |
|
if (err) { |
|
message = "writing rx-ring-ref"; |
|
goto error; |
|
} |
|
|
|
/* Write event channels; taking into account both shared |
|
* and split event channel scenarios. |
|
*/ |
|
if (queue->tx_evtchn == queue->rx_evtchn) { |
|
/* Shared event channel */ |
|
err = xenbus_printf(*xbt, path, |
|
"event-channel", "%u", queue->tx_evtchn); |
|
if (err) { |
|
message = "writing event-channel"; |
|
goto error; |
|
} |
|
} else { |
|
/* Split event channels */ |
|
err = xenbus_printf(*xbt, path, |
|
"event-channel-tx", "%u", queue->tx_evtchn); |
|
if (err) { |
|
message = "writing event-channel-tx"; |
|
goto error; |
|
} |
|
|
|
err = xenbus_printf(*xbt, path, |
|
"event-channel-rx", "%u", queue->rx_evtchn); |
|
if (err) { |
|
message = "writing event-channel-rx"; |
|
goto error; |
|
} |
|
} |
|
|
|
if (write_hierarchical) |
|
kfree(path); |
|
return 0; |
|
|
|
error: |
|
if (write_hierarchical) |
|
kfree(path); |
|
xenbus_dev_fatal(dev, err, "%s", message); |
|
return err; |
|
} |
|
|
|
static void xennet_destroy_queues(struct netfront_info *info) |
|
{ |
|
unsigned int i; |
|
|
|
for (i = 0; i < info->netdev->real_num_tx_queues; i++) { |
|
struct netfront_queue *queue = &info->queues[i]; |
|
|
|
if (netif_running(info->netdev)) |
|
napi_disable(&queue->napi); |
|
netif_napi_del(&queue->napi); |
|
} |
|
|
|
kfree(info->queues); |
|
info->queues = NULL; |
|
} |
|
|
|
|
|
|
|
static int xennet_create_page_pool(struct netfront_queue *queue) |
|
{ |
|
int err; |
|
struct page_pool_params pp_params = { |
|
.order = 0, |
|
.flags = 0, |
|
.pool_size = NET_RX_RING_SIZE, |
|
.nid = NUMA_NO_NODE, |
|
.dev = &queue->info->netdev->dev, |
|
.offset = XDP_PACKET_HEADROOM, |
|
.max_len = XEN_PAGE_SIZE - XDP_PACKET_HEADROOM, |
|
}; |
|
|
|
queue->page_pool = page_pool_create(&pp_params); |
|
if (IS_ERR(queue->page_pool)) { |
|
err = PTR_ERR(queue->page_pool); |
|
queue->page_pool = NULL; |
|
return err; |
|
} |
|
|
|
err = xdp_rxq_info_reg(&queue->xdp_rxq, queue->info->netdev, |
|
queue->id, 0); |
|
if (err) { |
|
netdev_err(queue->info->netdev, "xdp_rxq_info_reg failed\n"); |
|
goto err_free_pp; |
|
} |
|
|
|
err = xdp_rxq_info_reg_mem_model(&queue->xdp_rxq, |
|
MEM_TYPE_PAGE_POOL, queue->page_pool); |
|
if (err) { |
|
netdev_err(queue->info->netdev, "xdp_rxq_info_reg_mem_model failed\n"); |
|
goto err_unregister_rxq; |
|
} |
|
return 0; |
|
|
|
err_unregister_rxq: |
|
xdp_rxq_info_unreg(&queue->xdp_rxq); |
|
err_free_pp: |
|
page_pool_destroy(queue->page_pool); |
|
queue->page_pool = NULL; |
|
return err; |
|
} |
|
|
|
static int xennet_create_queues(struct netfront_info *info, |
|
unsigned int *num_queues) |
|
{ |
|
unsigned int i; |
|
int ret; |
|
|
|
info->queues = kcalloc(*num_queues, sizeof(struct netfront_queue), |
|
GFP_KERNEL); |
|
if (!info->queues) |
|
return -ENOMEM; |
|
|
|
for (i = 0; i < *num_queues; i++) { |
|
struct netfront_queue *queue = &info->queues[i]; |
|
|
|
queue->id = i; |
|
queue->info = info; |
|
|
|
ret = xennet_init_queue(queue); |
|
if (ret < 0) { |
|
dev_warn(&info->xbdev->dev, |
|
"only created %d queues\n", i); |
|
*num_queues = i; |
|
break; |
|
} |
|
|
|
/* use page pool recycling instead of buddy allocator */ |
|
ret = xennet_create_page_pool(queue); |
|
if (ret < 0) { |
|
dev_err(&info->xbdev->dev, "can't allocate page pool\n"); |
|
*num_queues = i; |
|
return ret; |
|
} |
|
|
|
netif_napi_add(queue->info->netdev, &queue->napi, |
|
xennet_poll, 64); |
|
if (netif_running(info->netdev)) |
|
napi_enable(&queue->napi); |
|
} |
|
|
|
netif_set_real_num_tx_queues(info->netdev, *num_queues); |
|
|
|
if (*num_queues == 0) { |
|
dev_err(&info->xbdev->dev, "no queues\n"); |
|
return -EINVAL; |
|
} |
|
return 0; |
|
} |
|
|
|
/* Common code used when first setting up, and when resuming. */ |
|
static int talk_to_netback(struct xenbus_device *dev, |
|
struct netfront_info *info) |
|
{ |
|
const char *message; |
|
struct xenbus_transaction xbt; |
|
int err; |
|
unsigned int feature_split_evtchn; |
|
unsigned int i = 0; |
|
unsigned int max_queues = 0; |
|
struct netfront_queue *queue = NULL; |
|
unsigned int num_queues = 1; |
|
|
|
info->netdev->irq = 0; |
|
|
|
/* Check if backend supports multiple queues */ |
|
max_queues = xenbus_read_unsigned(info->xbdev->otherend, |
|
"multi-queue-max-queues", 1); |
|
num_queues = min(max_queues, xennet_max_queues); |
|
|
|
/* Check feature-split-event-channels */ |
|
feature_split_evtchn = xenbus_read_unsigned(info->xbdev->otherend, |
|
"feature-split-event-channels", 0); |
|
|
|
/* Read mac addr. */ |
|
err = xen_net_read_mac(dev, info->netdev->dev_addr); |
|
if (err) { |
|
xenbus_dev_fatal(dev, err, "parsing %s/mac", dev->nodename); |
|
goto out_unlocked; |
|
} |
|
|
|
info->netback_has_xdp_headroom = xenbus_read_unsigned(info->xbdev->otherend, |
|
"feature-xdp-headroom", 0); |
|
if (info->netback_has_xdp_headroom) { |
|
/* set the current xen-netfront xdp state */ |
|
err = talk_to_netback_xdp(info, info->netfront_xdp_enabled ? |
|
NETBACK_XDP_HEADROOM_ENABLE : |
|
NETBACK_XDP_HEADROOM_DISABLE); |
|
if (err) |
|
goto out_unlocked; |
|
} |
|
|
|
rtnl_lock(); |
|
if (info->queues) |
|
xennet_destroy_queues(info); |
|
|
|
/* For the case of a reconnect reset the "broken" indicator. */ |
|
info->broken = false; |
|
|
|
err = xennet_create_queues(info, &num_queues); |
|
if (err < 0) { |
|
xenbus_dev_fatal(dev, err, "creating queues"); |
|
kfree(info->queues); |
|
info->queues = NULL; |
|
goto out; |
|
} |
|
rtnl_unlock(); |
|
|
|
/* Create shared ring, alloc event channel -- for each queue */ |
|
for (i = 0; i < num_queues; ++i) { |
|
queue = &info->queues[i]; |
|
err = setup_netfront(dev, queue, feature_split_evtchn); |
|
if (err) |
|
goto destroy_ring; |
|
} |
|
|
|
again: |
|
err = xenbus_transaction_start(&xbt); |
|
if (err) { |
|
xenbus_dev_fatal(dev, err, "starting transaction"); |
|
goto destroy_ring; |
|
} |
|
|
|
if (xenbus_exists(XBT_NIL, |
|
info->xbdev->otherend, "multi-queue-max-queues")) { |
|
/* Write the number of queues */ |
|
err = xenbus_printf(xbt, dev->nodename, |
|
"multi-queue-num-queues", "%u", num_queues); |
|
if (err) { |
|
message = "writing multi-queue-num-queues"; |
|
goto abort_transaction_no_dev_fatal; |
|
} |
|
} |
|
|
|
if (num_queues == 1) { |
|
err = write_queue_xenstore_keys(&info->queues[0], &xbt, 0); /* flat */ |
|
if (err) |
|
goto abort_transaction_no_dev_fatal; |
|
} else { |
|
/* Write the keys for each queue */ |
|
for (i = 0; i < num_queues; ++i) { |
|
queue = &info->queues[i]; |
|
err = write_queue_xenstore_keys(queue, &xbt, 1); /* hierarchical */ |
|
if (err) |
|
goto abort_transaction_no_dev_fatal; |
|
} |
|
} |
|
|
|
/* The remaining keys are not queue-specific */ |
|
err = xenbus_printf(xbt, dev->nodename, "request-rx-copy", "%u", |
|
1); |
|
if (err) { |
|
message = "writing request-rx-copy"; |
|
goto abort_transaction; |
|
} |
|
|
|
err = xenbus_printf(xbt, dev->nodename, "feature-rx-notify", "%d", 1); |
|
if (err) { |
|
message = "writing feature-rx-notify"; |
|
goto abort_transaction; |
|
} |
|
|
|
err = xenbus_printf(xbt, dev->nodename, "feature-sg", "%d", 1); |
|
if (err) { |
|
message = "writing feature-sg"; |
|
goto abort_transaction; |
|
} |
|
|
|
err = xenbus_printf(xbt, dev->nodename, "feature-gso-tcpv4", "%d", 1); |
|
if (err) { |
|
message = "writing feature-gso-tcpv4"; |
|
goto abort_transaction; |
|
} |
|
|
|
err = xenbus_write(xbt, dev->nodename, "feature-gso-tcpv6", "1"); |
|
if (err) { |
|
message = "writing feature-gso-tcpv6"; |
|
goto abort_transaction; |
|
} |
|
|
|
err = xenbus_write(xbt, dev->nodename, "feature-ipv6-csum-offload", |
|
"1"); |
|
if (err) { |
|
message = "writing feature-ipv6-csum-offload"; |
|
goto abort_transaction; |
|
} |
|
|
|
err = xenbus_transaction_end(xbt, 0); |
|
if (err) { |
|
if (err == -EAGAIN) |
|
goto again; |
|
xenbus_dev_fatal(dev, err, "completing transaction"); |
|
goto destroy_ring; |
|
} |
|
|
|
return 0; |
|
|
|
abort_transaction: |
|
xenbus_dev_fatal(dev, err, "%s", message); |
|
abort_transaction_no_dev_fatal: |
|
xenbus_transaction_end(xbt, 1); |
|
destroy_ring: |
|
xennet_disconnect_backend(info); |
|
rtnl_lock(); |
|
xennet_destroy_queues(info); |
|
out: |
|
rtnl_unlock(); |
|
out_unlocked: |
|
device_unregister(&dev->dev); |
|
return err; |
|
} |
|
|
|
static int xennet_connect(struct net_device *dev) |
|
{ |
|
struct netfront_info *np = netdev_priv(dev); |
|
unsigned int num_queues = 0; |
|
int err; |
|
unsigned int j = 0; |
|
struct netfront_queue *queue = NULL; |
|
|
|
if (!xenbus_read_unsigned(np->xbdev->otherend, "feature-rx-copy", 0)) { |
|
dev_info(&dev->dev, |
|
"backend does not support copying receive path\n"); |
|
return -ENODEV; |
|
} |
|
|
|
err = talk_to_netback(np->xbdev, np); |
|
if (err) |
|
return err; |
|
if (np->netback_has_xdp_headroom) |
|
pr_info("backend supports XDP headroom\n"); |
|
|
|
/* talk_to_netback() sets the correct number of queues */ |
|
num_queues = dev->real_num_tx_queues; |
|
|
|
if (dev->reg_state == NETREG_UNINITIALIZED) { |
|
err = register_netdev(dev); |
|
if (err) { |
|
pr_warn("%s: register_netdev err=%d\n", __func__, err); |
|
device_unregister(&np->xbdev->dev); |
|
return err; |
|
} |
|
} |
|
|
|
rtnl_lock(); |
|
netdev_update_features(dev); |
|
rtnl_unlock(); |
|
|
|
/* |
|
* All public and private state should now be sane. Get |
|
* ready to start sending and receiving packets and give the driver |
|
* domain a kick because we've probably just requeued some |
|
* packets. |
|
*/ |
|
netif_carrier_on(np->netdev); |
|
for (j = 0; j < num_queues; ++j) { |
|
queue = &np->queues[j]; |
|
|
|
notify_remote_via_irq(queue->tx_irq); |
|
if (queue->tx_irq != queue->rx_irq) |
|
notify_remote_via_irq(queue->rx_irq); |
|
|
|
spin_lock_irq(&queue->tx_lock); |
|
xennet_tx_buf_gc(queue); |
|
spin_unlock_irq(&queue->tx_lock); |
|
|
|
spin_lock_bh(&queue->rx_lock); |
|
xennet_alloc_rx_buffers(queue); |
|
spin_unlock_bh(&queue->rx_lock); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Callback received when the backend's state changes. |
|
*/ |
|
static void netback_changed(struct xenbus_device *dev, |
|
enum xenbus_state backend_state) |
|
{ |
|
struct netfront_info *np = dev_get_drvdata(&dev->dev); |
|
struct net_device *netdev = np->netdev; |
|
|
|
dev_dbg(&dev->dev, "%s\n", xenbus_strstate(backend_state)); |
|
|
|
wake_up_all(&module_wq); |
|
|
|
switch (backend_state) { |
|
case XenbusStateInitialising: |
|
case XenbusStateInitialised: |
|
case XenbusStateReconfiguring: |
|
case XenbusStateReconfigured: |
|
case XenbusStateUnknown: |
|
break; |
|
|
|
case XenbusStateInitWait: |
|
if (dev->state != XenbusStateInitialising) |
|
break; |
|
if (xennet_connect(netdev) != 0) |
|
break; |
|
xenbus_switch_state(dev, XenbusStateConnected); |
|
break; |
|
|
|
case XenbusStateConnected: |
|
netdev_notify_peers(netdev); |
|
break; |
|
|
|
case XenbusStateClosed: |
|
if (dev->state == XenbusStateClosed) |
|
break; |
|
fallthrough; /* Missed the backend's CLOSING state */ |
|
case XenbusStateClosing: |
|
xenbus_frontend_closed(dev); |
|
break; |
|
} |
|
} |
|
|
|
static const struct xennet_stat { |
|
char name[ETH_GSTRING_LEN]; |
|
u16 offset; |
|
} xennet_stats[] = { |
|
{ |
|
"rx_gso_checksum_fixup", |
|
offsetof(struct netfront_info, rx_gso_checksum_fixup) |
|
}, |
|
}; |
|
|
|
static int xennet_get_sset_count(struct net_device *dev, int string_set) |
|
{ |
|
switch (string_set) { |
|
case ETH_SS_STATS: |
|
return ARRAY_SIZE(xennet_stats); |
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static void xennet_get_ethtool_stats(struct net_device *dev, |
|
struct ethtool_stats *stats, u64 * data) |
|
{ |
|
void *np = netdev_priv(dev); |
|
int i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) |
|
data[i] = atomic_read((atomic_t *)(np + xennet_stats[i].offset)); |
|
} |
|
|
|
static void xennet_get_strings(struct net_device *dev, u32 stringset, u8 * data) |
|
{ |
|
int i; |
|
|
|
switch (stringset) { |
|
case ETH_SS_STATS: |
|
for (i = 0; i < ARRAY_SIZE(xennet_stats); i++) |
|
memcpy(data + i * ETH_GSTRING_LEN, |
|
xennet_stats[i].name, ETH_GSTRING_LEN); |
|
break; |
|
} |
|
} |
|
|
|
static const struct ethtool_ops xennet_ethtool_ops = |
|
{ |
|
.get_link = ethtool_op_get_link, |
|
|
|
.get_sset_count = xennet_get_sset_count, |
|
.get_ethtool_stats = xennet_get_ethtool_stats, |
|
.get_strings = xennet_get_strings, |
|
.get_ts_info = ethtool_op_get_ts_info, |
|
}; |
|
|
|
#ifdef CONFIG_SYSFS |
|
static ssize_t show_rxbuf(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
return sprintf(buf, "%lu\n", NET_RX_RING_SIZE); |
|
} |
|
|
|
static ssize_t store_rxbuf(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t len) |
|
{ |
|
char *endp; |
|
|
|
if (!capable(CAP_NET_ADMIN)) |
|
return -EPERM; |
|
|
|
simple_strtoul(buf, &endp, 0); |
|
if (endp == buf) |
|
return -EBADMSG; |
|
|
|
/* rxbuf_min and rxbuf_max are no longer configurable. */ |
|
|
|
return len; |
|
} |
|
|
|
static DEVICE_ATTR(rxbuf_min, 0644, show_rxbuf, store_rxbuf); |
|
static DEVICE_ATTR(rxbuf_max, 0644, show_rxbuf, store_rxbuf); |
|
static DEVICE_ATTR(rxbuf_cur, 0444, show_rxbuf, NULL); |
|
|
|
static struct attribute *xennet_dev_attrs[] = { |
|
&dev_attr_rxbuf_min.attr, |
|
&dev_attr_rxbuf_max.attr, |
|
&dev_attr_rxbuf_cur.attr, |
|
NULL |
|
}; |
|
|
|
static const struct attribute_group xennet_dev_group = { |
|
.attrs = xennet_dev_attrs |
|
}; |
|
#endif /* CONFIG_SYSFS */ |
|
|
|
static void xennet_bus_close(struct xenbus_device *dev) |
|
{ |
|
int ret; |
|
|
|
if (xenbus_read_driver_state(dev->otherend) == XenbusStateClosed) |
|
return; |
|
do { |
|
xenbus_switch_state(dev, XenbusStateClosing); |
|
ret = wait_event_timeout(module_wq, |
|
xenbus_read_driver_state(dev->otherend) == |
|
XenbusStateClosing || |
|
xenbus_read_driver_state(dev->otherend) == |
|
XenbusStateClosed || |
|
xenbus_read_driver_state(dev->otherend) == |
|
XenbusStateUnknown, |
|
XENNET_TIMEOUT); |
|
} while (!ret); |
|
|
|
if (xenbus_read_driver_state(dev->otherend) == XenbusStateClosed) |
|
return; |
|
|
|
do { |
|
xenbus_switch_state(dev, XenbusStateClosed); |
|
ret = wait_event_timeout(module_wq, |
|
xenbus_read_driver_state(dev->otherend) == |
|
XenbusStateClosed || |
|
xenbus_read_driver_state(dev->otherend) == |
|
XenbusStateUnknown, |
|
XENNET_TIMEOUT); |
|
} while (!ret); |
|
} |
|
|
|
static int xennet_remove(struct xenbus_device *dev) |
|
{ |
|
struct netfront_info *info = dev_get_drvdata(&dev->dev); |
|
|
|
xennet_bus_close(dev); |
|
xennet_disconnect_backend(info); |
|
|
|
if (info->netdev->reg_state == NETREG_REGISTERED) |
|
unregister_netdev(info->netdev); |
|
|
|
if (info->queues) { |
|
rtnl_lock(); |
|
xennet_destroy_queues(info); |
|
rtnl_unlock(); |
|
} |
|
xennet_free_netdev(info->netdev); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct xenbus_device_id netfront_ids[] = { |
|
{ "vif" }, |
|
{ "" } |
|
}; |
|
|
|
static struct xenbus_driver netfront_driver = { |
|
.ids = netfront_ids, |
|
.probe = netfront_probe, |
|
.remove = xennet_remove, |
|
.resume = netfront_resume, |
|
.otherend_changed = netback_changed, |
|
}; |
|
|
|
static int __init netif_init(void) |
|
{ |
|
if (!xen_domain()) |
|
return -ENODEV; |
|
|
|
if (!xen_has_pv_nic_devices()) |
|
return -ENODEV; |
|
|
|
pr_info("Initialising Xen virtual ethernet driver\n"); |
|
|
|
/* Allow as many queues as there are CPUs inut max. 8 if user has not |
|
* specified a value. |
|
*/ |
|
if (xennet_max_queues == 0) |
|
xennet_max_queues = min_t(unsigned int, MAX_QUEUES_DEFAULT, |
|
num_online_cpus()); |
|
|
|
return xenbus_register_frontend(&netfront_driver); |
|
} |
|
module_init(netif_init); |
|
|
|
|
|
static void __exit netif_exit(void) |
|
{ |
|
xenbus_unregister_driver(&netfront_driver); |
|
} |
|
module_exit(netif_exit); |
|
|
|
MODULE_DESCRIPTION("Xen virtual network device frontend"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("xen:vif"); |
|
MODULE_ALIAS("xennet");
|
|
|