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2019 lines
46 KiB
2019 lines
46 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* net-sysfs.c - network device class and attributes |
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* |
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* Copyright (c) 2003 Stephen Hemminger <[email protected]> |
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*/ |
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#include <linux/capability.h> |
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#include <linux/kernel.h> |
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#include <linux/netdevice.h> |
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#include <linux/if_arp.h> |
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#include <linux/slab.h> |
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#include <linux/sched/signal.h> |
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#include <linux/sched/isolation.h> |
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#include <linux/nsproxy.h> |
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#include <net/sock.h> |
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#include <net/net_namespace.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/vmalloc.h> |
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#include <linux/export.h> |
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#include <linux/jiffies.h> |
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#include <linux/pm_runtime.h> |
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#include <linux/of.h> |
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#include <linux/of_net.h> |
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#include <linux/cpu.h> |
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#include "net-sysfs.h" |
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#ifdef CONFIG_SYSFS |
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static const char fmt_hex[] = "%#x\n"; |
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static const char fmt_dec[] = "%d\n"; |
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static const char fmt_ulong[] = "%lu\n"; |
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static const char fmt_u64[] = "%llu\n"; |
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static inline int dev_isalive(const struct net_device *dev) |
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{ |
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return dev->reg_state <= NETREG_REGISTERED; |
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} |
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/* use same locking rules as GIF* ioctl's */ |
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static ssize_t netdev_show(const struct device *dev, |
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struct device_attribute *attr, char *buf, |
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ssize_t (*format)(const struct net_device *, char *)) |
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{ |
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struct net_device *ndev = to_net_dev(dev); |
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ssize_t ret = -EINVAL; |
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read_lock(&dev_base_lock); |
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if (dev_isalive(ndev)) |
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ret = (*format)(ndev, buf); |
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read_unlock(&dev_base_lock); |
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return ret; |
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} |
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/* generate a show function for simple field */ |
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#define NETDEVICE_SHOW(field, format_string) \ |
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static ssize_t format_##field(const struct net_device *dev, char *buf) \ |
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{ \ |
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return sprintf(buf, format_string, dev->field); \ |
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} \ |
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static ssize_t field##_show(struct device *dev, \ |
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struct device_attribute *attr, char *buf) \ |
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{ \ |
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return netdev_show(dev, attr, buf, format_##field); \ |
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} \ |
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#define NETDEVICE_SHOW_RO(field, format_string) \ |
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NETDEVICE_SHOW(field, format_string); \ |
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static DEVICE_ATTR_RO(field) |
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#define NETDEVICE_SHOW_RW(field, format_string) \ |
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NETDEVICE_SHOW(field, format_string); \ |
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static DEVICE_ATTR_RW(field) |
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/* use same locking and permission rules as SIF* ioctl's */ |
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static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t len, |
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int (*set)(struct net_device *, unsigned long)) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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struct net *net = dev_net(netdev); |
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unsigned long new; |
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int ret; |
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if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
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return -EPERM; |
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ret = kstrtoul(buf, 0, &new); |
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if (ret) |
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goto err; |
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if (!rtnl_trylock()) |
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return restart_syscall(); |
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if (dev_isalive(netdev)) { |
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ret = (*set)(netdev, new); |
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if (ret == 0) |
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ret = len; |
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} |
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rtnl_unlock(); |
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err: |
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return ret; |
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} |
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NETDEVICE_SHOW_RO(dev_id, fmt_hex); |
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NETDEVICE_SHOW_RO(dev_port, fmt_dec); |
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NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec); |
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NETDEVICE_SHOW_RO(addr_len, fmt_dec); |
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NETDEVICE_SHOW_RO(ifindex, fmt_dec); |
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NETDEVICE_SHOW_RO(type, fmt_dec); |
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NETDEVICE_SHOW_RO(link_mode, fmt_dec); |
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static ssize_t iflink_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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struct net_device *ndev = to_net_dev(dev); |
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return sprintf(buf, fmt_dec, dev_get_iflink(ndev)); |
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} |
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static DEVICE_ATTR_RO(iflink); |
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static ssize_t format_name_assign_type(const struct net_device *dev, char *buf) |
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{ |
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return sprintf(buf, fmt_dec, dev->name_assign_type); |
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} |
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static ssize_t name_assign_type_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct net_device *ndev = to_net_dev(dev); |
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ssize_t ret = -EINVAL; |
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if (ndev->name_assign_type != NET_NAME_UNKNOWN) |
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ret = netdev_show(dev, attr, buf, format_name_assign_type); |
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return ret; |
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} |
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static DEVICE_ATTR_RO(name_assign_type); |
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/* use same locking rules as GIFHWADDR ioctl's */ |
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static ssize_t address_show(struct device *dev, struct device_attribute *attr, |
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char *buf) |
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{ |
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struct net_device *ndev = to_net_dev(dev); |
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ssize_t ret = -EINVAL; |
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read_lock(&dev_base_lock); |
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if (dev_isalive(ndev)) |
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ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len); |
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read_unlock(&dev_base_lock); |
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return ret; |
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} |
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static DEVICE_ATTR_RO(address); |
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static ssize_t broadcast_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct net_device *ndev = to_net_dev(dev); |
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if (dev_isalive(ndev)) |
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return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len); |
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return -EINVAL; |
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} |
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static DEVICE_ATTR_RO(broadcast); |
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static int change_carrier(struct net_device *dev, unsigned long new_carrier) |
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{ |
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if (!netif_running(dev)) |
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return -EINVAL; |
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return dev_change_carrier(dev, (bool)new_carrier); |
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} |
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static ssize_t carrier_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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return netdev_store(dev, attr, buf, len, change_carrier); |
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} |
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static ssize_t carrier_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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if (netif_running(netdev)) |
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return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); |
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return -EINVAL; |
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} |
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static DEVICE_ATTR_RW(carrier); |
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static ssize_t speed_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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int ret = -EINVAL; |
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if (!rtnl_trylock()) |
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return restart_syscall(); |
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if (netif_running(netdev)) { |
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struct ethtool_link_ksettings cmd; |
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if (!__ethtool_get_link_ksettings(netdev, &cmd)) |
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ret = sprintf(buf, fmt_dec, cmd.base.speed); |
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} |
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rtnl_unlock(); |
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return ret; |
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} |
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static DEVICE_ATTR_RO(speed); |
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static ssize_t duplex_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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int ret = -EINVAL; |
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if (!rtnl_trylock()) |
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return restart_syscall(); |
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if (netif_running(netdev)) { |
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struct ethtool_link_ksettings cmd; |
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if (!__ethtool_get_link_ksettings(netdev, &cmd)) { |
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const char *duplex; |
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switch (cmd.base.duplex) { |
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case DUPLEX_HALF: |
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duplex = "half"; |
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break; |
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case DUPLEX_FULL: |
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duplex = "full"; |
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break; |
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default: |
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duplex = "unknown"; |
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break; |
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} |
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ret = sprintf(buf, "%s\n", duplex); |
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} |
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} |
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rtnl_unlock(); |
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return ret; |
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} |
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static DEVICE_ATTR_RO(duplex); |
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static ssize_t testing_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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if (netif_running(netdev)) |
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return sprintf(buf, fmt_dec, !!netif_testing(netdev)); |
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return -EINVAL; |
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} |
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static DEVICE_ATTR_RO(testing); |
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static ssize_t dormant_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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if (netif_running(netdev)) |
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return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); |
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return -EINVAL; |
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} |
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static DEVICE_ATTR_RO(dormant); |
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static const char *const operstates[] = { |
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"unknown", |
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"notpresent", /* currently unused */ |
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"down", |
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"lowerlayerdown", |
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"testing", |
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"dormant", |
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"up" |
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}; |
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static ssize_t operstate_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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const struct net_device *netdev = to_net_dev(dev); |
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unsigned char operstate; |
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read_lock(&dev_base_lock); |
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operstate = netdev->operstate; |
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if (!netif_running(netdev)) |
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operstate = IF_OPER_DOWN; |
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read_unlock(&dev_base_lock); |
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if (operstate >= ARRAY_SIZE(operstates)) |
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return -EINVAL; /* should not happen */ |
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return sprintf(buf, "%s\n", operstates[operstate]); |
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} |
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static DEVICE_ATTR_RO(operstate); |
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static ssize_t carrier_changes_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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return sprintf(buf, fmt_dec, |
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atomic_read(&netdev->carrier_up_count) + |
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atomic_read(&netdev->carrier_down_count)); |
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} |
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static DEVICE_ATTR_RO(carrier_changes); |
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static ssize_t carrier_up_count_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count)); |
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} |
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static DEVICE_ATTR_RO(carrier_up_count); |
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static ssize_t carrier_down_count_show(struct device *dev, |
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struct device_attribute *attr, |
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char *buf) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count)); |
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} |
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static DEVICE_ATTR_RO(carrier_down_count); |
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/* read-write attributes */ |
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static int change_mtu(struct net_device *dev, unsigned long new_mtu) |
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{ |
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return dev_set_mtu(dev, (int)new_mtu); |
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} |
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static ssize_t mtu_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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return netdev_store(dev, attr, buf, len, change_mtu); |
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} |
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NETDEVICE_SHOW_RW(mtu, fmt_dec); |
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static int change_flags(struct net_device *dev, unsigned long new_flags) |
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{ |
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return dev_change_flags(dev, (unsigned int)new_flags, NULL); |
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} |
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static ssize_t flags_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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return netdev_store(dev, attr, buf, len, change_flags); |
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} |
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NETDEVICE_SHOW_RW(flags, fmt_hex); |
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static ssize_t tx_queue_len_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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if (!capable(CAP_NET_ADMIN)) |
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return -EPERM; |
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return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len); |
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} |
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NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec); |
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static int change_gro_flush_timeout(struct net_device *dev, unsigned long val) |
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{ |
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WRITE_ONCE(dev->gro_flush_timeout, val); |
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return 0; |
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} |
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static ssize_t gro_flush_timeout_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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if (!capable(CAP_NET_ADMIN)) |
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return -EPERM; |
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return netdev_store(dev, attr, buf, len, change_gro_flush_timeout); |
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} |
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NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong); |
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static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val) |
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{ |
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WRITE_ONCE(dev->napi_defer_hard_irqs, val); |
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return 0; |
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} |
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static ssize_t napi_defer_hard_irqs_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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if (!capable(CAP_NET_ADMIN)) |
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return -EPERM; |
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return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs); |
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} |
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NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec); |
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static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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struct net *net = dev_net(netdev); |
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size_t count = len; |
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ssize_t ret = 0; |
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if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
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return -EPERM; |
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/* ignore trailing newline */ |
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if (len > 0 && buf[len - 1] == '\n') |
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--count; |
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if (!rtnl_trylock()) |
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return restart_syscall(); |
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if (dev_isalive(netdev)) { |
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ret = dev_set_alias(netdev, buf, count); |
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if (ret < 0) |
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goto err; |
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ret = len; |
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netdev_state_change(netdev); |
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} |
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err: |
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rtnl_unlock(); |
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return ret; |
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} |
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static ssize_t ifalias_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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const struct net_device *netdev = to_net_dev(dev); |
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char tmp[IFALIASZ]; |
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ssize_t ret = 0; |
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ret = dev_get_alias(netdev, tmp, sizeof(tmp)); |
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if (ret > 0) |
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ret = sprintf(buf, "%s\n", tmp); |
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return ret; |
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} |
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static DEVICE_ATTR_RW(ifalias); |
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static int change_group(struct net_device *dev, unsigned long new_group) |
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{ |
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dev_set_group(dev, (int)new_group); |
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return 0; |
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} |
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static ssize_t group_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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return netdev_store(dev, attr, buf, len, change_group); |
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} |
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NETDEVICE_SHOW(group, fmt_dec); |
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static DEVICE_ATTR(netdev_group, 0644, group_show, group_store); |
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static int change_proto_down(struct net_device *dev, unsigned long proto_down) |
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{ |
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return dev_change_proto_down(dev, (bool)proto_down); |
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} |
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static ssize_t proto_down_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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return netdev_store(dev, attr, buf, len, change_proto_down); |
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} |
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NETDEVICE_SHOW_RW(proto_down, fmt_dec); |
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static ssize_t phys_port_id_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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ssize_t ret = -EINVAL; |
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if (!rtnl_trylock()) |
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return restart_syscall(); |
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if (dev_isalive(netdev)) { |
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struct netdev_phys_item_id ppid; |
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ret = dev_get_phys_port_id(netdev, &ppid); |
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if (!ret) |
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ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); |
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} |
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rtnl_unlock(); |
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return ret; |
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} |
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static DEVICE_ATTR_RO(phys_port_id); |
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static ssize_t phys_port_name_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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ssize_t ret = -EINVAL; |
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if (!rtnl_trylock()) |
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return restart_syscall(); |
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if (dev_isalive(netdev)) { |
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char name[IFNAMSIZ]; |
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ret = dev_get_phys_port_name(netdev, name, sizeof(name)); |
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if (!ret) |
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ret = sprintf(buf, "%s\n", name); |
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} |
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rtnl_unlock(); |
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return ret; |
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} |
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static DEVICE_ATTR_RO(phys_port_name); |
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static ssize_t phys_switch_id_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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ssize_t ret = -EINVAL; |
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if (!rtnl_trylock()) |
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return restart_syscall(); |
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if (dev_isalive(netdev)) { |
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struct netdev_phys_item_id ppid = { }; |
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ret = dev_get_port_parent_id(netdev, &ppid, false); |
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if (!ret) |
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ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); |
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} |
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rtnl_unlock(); |
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return ret; |
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} |
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static DEVICE_ATTR_RO(phys_switch_id); |
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static ssize_t threaded_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct net_device *netdev = to_net_dev(dev); |
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ssize_t ret = -EINVAL; |
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if (!rtnl_trylock()) |
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return restart_syscall(); |
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if (dev_isalive(netdev)) |
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ret = sprintf(buf, fmt_dec, netdev->threaded); |
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rtnl_unlock(); |
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return ret; |
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} |
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static int modify_napi_threaded(struct net_device *dev, unsigned long val) |
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{ |
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int ret; |
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if (list_empty(&dev->napi_list)) |
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return -EOPNOTSUPP; |
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if (val != 0 && val != 1) |
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return -EOPNOTSUPP; |
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ret = dev_set_threaded(dev, val); |
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return ret; |
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} |
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static ssize_t threaded_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t len) |
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{ |
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return netdev_store(dev, attr, buf, len, modify_napi_threaded); |
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} |
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static DEVICE_ATTR_RW(threaded); |
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|
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static struct attribute *net_class_attrs[] __ro_after_init = { |
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&dev_attr_netdev_group.attr, |
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&dev_attr_type.attr, |
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&dev_attr_dev_id.attr, |
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&dev_attr_dev_port.attr, |
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&dev_attr_iflink.attr, |
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&dev_attr_ifindex.attr, |
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&dev_attr_name_assign_type.attr, |
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&dev_attr_addr_assign_type.attr, |
|
&dev_attr_addr_len.attr, |
|
&dev_attr_link_mode.attr, |
|
&dev_attr_address.attr, |
|
&dev_attr_broadcast.attr, |
|
&dev_attr_speed.attr, |
|
&dev_attr_duplex.attr, |
|
&dev_attr_dormant.attr, |
|
&dev_attr_testing.attr, |
|
&dev_attr_operstate.attr, |
|
&dev_attr_carrier_changes.attr, |
|
&dev_attr_ifalias.attr, |
|
&dev_attr_carrier.attr, |
|
&dev_attr_mtu.attr, |
|
&dev_attr_flags.attr, |
|
&dev_attr_tx_queue_len.attr, |
|
&dev_attr_gro_flush_timeout.attr, |
|
&dev_attr_napi_defer_hard_irqs.attr, |
|
&dev_attr_phys_port_id.attr, |
|
&dev_attr_phys_port_name.attr, |
|
&dev_attr_phys_switch_id.attr, |
|
&dev_attr_proto_down.attr, |
|
&dev_attr_carrier_up_count.attr, |
|
&dev_attr_carrier_down_count.attr, |
|
&dev_attr_threaded.attr, |
|
NULL, |
|
}; |
|
ATTRIBUTE_GROUPS(net_class); |
|
|
|
/* Show a given an attribute in the statistics group */ |
|
static ssize_t netstat_show(const struct device *d, |
|
struct device_attribute *attr, char *buf, |
|
unsigned long offset) |
|
{ |
|
struct net_device *dev = to_net_dev(d); |
|
ssize_t ret = -EINVAL; |
|
|
|
WARN_ON(offset > sizeof(struct rtnl_link_stats64) || |
|
offset % sizeof(u64) != 0); |
|
|
|
read_lock(&dev_base_lock); |
|
if (dev_isalive(dev)) { |
|
struct rtnl_link_stats64 temp; |
|
const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); |
|
|
|
ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset)); |
|
} |
|
read_unlock(&dev_base_lock); |
|
return ret; |
|
} |
|
|
|
/* generate a read-only statistics attribute */ |
|
#define NETSTAT_ENTRY(name) \ |
|
static ssize_t name##_show(struct device *d, \ |
|
struct device_attribute *attr, char *buf) \ |
|
{ \ |
|
return netstat_show(d, attr, buf, \ |
|
offsetof(struct rtnl_link_stats64, name)); \ |
|
} \ |
|
static DEVICE_ATTR_RO(name) |
|
|
|
NETSTAT_ENTRY(rx_packets); |
|
NETSTAT_ENTRY(tx_packets); |
|
NETSTAT_ENTRY(rx_bytes); |
|
NETSTAT_ENTRY(tx_bytes); |
|
NETSTAT_ENTRY(rx_errors); |
|
NETSTAT_ENTRY(tx_errors); |
|
NETSTAT_ENTRY(rx_dropped); |
|
NETSTAT_ENTRY(tx_dropped); |
|
NETSTAT_ENTRY(multicast); |
|
NETSTAT_ENTRY(collisions); |
|
NETSTAT_ENTRY(rx_length_errors); |
|
NETSTAT_ENTRY(rx_over_errors); |
|
NETSTAT_ENTRY(rx_crc_errors); |
|
NETSTAT_ENTRY(rx_frame_errors); |
|
NETSTAT_ENTRY(rx_fifo_errors); |
|
NETSTAT_ENTRY(rx_missed_errors); |
|
NETSTAT_ENTRY(tx_aborted_errors); |
|
NETSTAT_ENTRY(tx_carrier_errors); |
|
NETSTAT_ENTRY(tx_fifo_errors); |
|
NETSTAT_ENTRY(tx_heartbeat_errors); |
|
NETSTAT_ENTRY(tx_window_errors); |
|
NETSTAT_ENTRY(rx_compressed); |
|
NETSTAT_ENTRY(tx_compressed); |
|
NETSTAT_ENTRY(rx_nohandler); |
|
|
|
static struct attribute *netstat_attrs[] __ro_after_init = { |
|
&dev_attr_rx_packets.attr, |
|
&dev_attr_tx_packets.attr, |
|
&dev_attr_rx_bytes.attr, |
|
&dev_attr_tx_bytes.attr, |
|
&dev_attr_rx_errors.attr, |
|
&dev_attr_tx_errors.attr, |
|
&dev_attr_rx_dropped.attr, |
|
&dev_attr_tx_dropped.attr, |
|
&dev_attr_multicast.attr, |
|
&dev_attr_collisions.attr, |
|
&dev_attr_rx_length_errors.attr, |
|
&dev_attr_rx_over_errors.attr, |
|
&dev_attr_rx_crc_errors.attr, |
|
&dev_attr_rx_frame_errors.attr, |
|
&dev_attr_rx_fifo_errors.attr, |
|
&dev_attr_rx_missed_errors.attr, |
|
&dev_attr_tx_aborted_errors.attr, |
|
&dev_attr_tx_carrier_errors.attr, |
|
&dev_attr_tx_fifo_errors.attr, |
|
&dev_attr_tx_heartbeat_errors.attr, |
|
&dev_attr_tx_window_errors.attr, |
|
&dev_attr_rx_compressed.attr, |
|
&dev_attr_tx_compressed.attr, |
|
&dev_attr_rx_nohandler.attr, |
|
NULL |
|
}; |
|
|
|
static const struct attribute_group netstat_group = { |
|
.name = "statistics", |
|
.attrs = netstat_attrs, |
|
}; |
|
|
|
#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) |
|
static struct attribute *wireless_attrs[] = { |
|
NULL |
|
}; |
|
|
|
static const struct attribute_group wireless_group = { |
|
.name = "wireless", |
|
.attrs = wireless_attrs, |
|
}; |
|
#endif |
|
|
|
#else /* CONFIG_SYSFS */ |
|
#define net_class_groups NULL |
|
#endif /* CONFIG_SYSFS */ |
|
|
|
#ifdef CONFIG_SYSFS |
|
#define to_rx_queue_attr(_attr) \ |
|
container_of(_attr, struct rx_queue_attribute, attr) |
|
|
|
#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) |
|
|
|
static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, |
|
char *buf) |
|
{ |
|
const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); |
|
struct netdev_rx_queue *queue = to_rx_queue(kobj); |
|
|
|
if (!attribute->show) |
|
return -EIO; |
|
|
|
return attribute->show(queue, buf); |
|
} |
|
|
|
static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); |
|
struct netdev_rx_queue *queue = to_rx_queue(kobj); |
|
|
|
if (!attribute->store) |
|
return -EIO; |
|
|
|
return attribute->store(queue, buf, count); |
|
} |
|
|
|
static const struct sysfs_ops rx_queue_sysfs_ops = { |
|
.show = rx_queue_attr_show, |
|
.store = rx_queue_attr_store, |
|
}; |
|
|
|
#ifdef CONFIG_RPS |
|
static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf) |
|
{ |
|
struct rps_map *map; |
|
cpumask_var_t mask; |
|
int i, len; |
|
|
|
if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) |
|
return -ENOMEM; |
|
|
|
rcu_read_lock(); |
|
map = rcu_dereference(queue->rps_map); |
|
if (map) |
|
for (i = 0; i < map->len; i++) |
|
cpumask_set_cpu(map->cpus[i], mask); |
|
|
|
len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); |
|
rcu_read_unlock(); |
|
free_cpumask_var(mask); |
|
|
|
return len < PAGE_SIZE ? len : -EINVAL; |
|
} |
|
|
|
static ssize_t store_rps_map(struct netdev_rx_queue *queue, |
|
const char *buf, size_t len) |
|
{ |
|
struct rps_map *old_map, *map; |
|
cpumask_var_t mask; |
|
int err, cpu, i, hk_flags; |
|
static DEFINE_MUTEX(rps_map_mutex); |
|
|
|
if (!capable(CAP_NET_ADMIN)) |
|
return -EPERM; |
|
|
|
if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
|
return -ENOMEM; |
|
|
|
err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); |
|
if (err) { |
|
free_cpumask_var(mask); |
|
return err; |
|
} |
|
|
|
if (!cpumask_empty(mask)) { |
|
hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ; |
|
cpumask_and(mask, mask, housekeeping_cpumask(hk_flags)); |
|
if (cpumask_empty(mask)) { |
|
free_cpumask_var(mask); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
map = kzalloc(max_t(unsigned int, |
|
RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), |
|
GFP_KERNEL); |
|
if (!map) { |
|
free_cpumask_var(mask); |
|
return -ENOMEM; |
|
} |
|
|
|
i = 0; |
|
for_each_cpu_and(cpu, mask, cpu_online_mask) |
|
map->cpus[i++] = cpu; |
|
|
|
if (i) { |
|
map->len = i; |
|
} else { |
|
kfree(map); |
|
map = NULL; |
|
} |
|
|
|
mutex_lock(&rps_map_mutex); |
|
old_map = rcu_dereference_protected(queue->rps_map, |
|
mutex_is_locked(&rps_map_mutex)); |
|
rcu_assign_pointer(queue->rps_map, map); |
|
|
|
if (map) |
|
static_branch_inc(&rps_needed); |
|
if (old_map) |
|
static_branch_dec(&rps_needed); |
|
|
|
mutex_unlock(&rps_map_mutex); |
|
|
|
if (old_map) |
|
kfree_rcu(old_map, rcu); |
|
|
|
free_cpumask_var(mask); |
|
return len; |
|
} |
|
|
|
static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, |
|
char *buf) |
|
{ |
|
struct rps_dev_flow_table *flow_table; |
|
unsigned long val = 0; |
|
|
|
rcu_read_lock(); |
|
flow_table = rcu_dereference(queue->rps_flow_table); |
|
if (flow_table) |
|
val = (unsigned long)flow_table->mask + 1; |
|
rcu_read_unlock(); |
|
|
|
return sprintf(buf, "%lu\n", val); |
|
} |
|
|
|
static void rps_dev_flow_table_release(struct rcu_head *rcu) |
|
{ |
|
struct rps_dev_flow_table *table = container_of(rcu, |
|
struct rps_dev_flow_table, rcu); |
|
vfree(table); |
|
} |
|
|
|
static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, |
|
const char *buf, size_t len) |
|
{ |
|
unsigned long mask, count; |
|
struct rps_dev_flow_table *table, *old_table; |
|
static DEFINE_SPINLOCK(rps_dev_flow_lock); |
|
int rc; |
|
|
|
if (!capable(CAP_NET_ADMIN)) |
|
return -EPERM; |
|
|
|
rc = kstrtoul(buf, 0, &count); |
|
if (rc < 0) |
|
return rc; |
|
|
|
if (count) { |
|
mask = count - 1; |
|
/* mask = roundup_pow_of_two(count) - 1; |
|
* without overflows... |
|
*/ |
|
while ((mask | (mask >> 1)) != mask) |
|
mask |= (mask >> 1); |
|
/* On 64 bit arches, must check mask fits in table->mask (u32), |
|
* and on 32bit arches, must check |
|
* RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow. |
|
*/ |
|
#if BITS_PER_LONG > 32 |
|
if (mask > (unsigned long)(u32)mask) |
|
return -EINVAL; |
|
#else |
|
if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) |
|
/ sizeof(struct rps_dev_flow)) { |
|
/* Enforce a limit to prevent overflow */ |
|
return -EINVAL; |
|
} |
|
#endif |
|
table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); |
|
if (!table) |
|
return -ENOMEM; |
|
|
|
table->mask = mask; |
|
for (count = 0; count <= mask; count++) |
|
table->flows[count].cpu = RPS_NO_CPU; |
|
} else { |
|
table = NULL; |
|
} |
|
|
|
spin_lock(&rps_dev_flow_lock); |
|
old_table = rcu_dereference_protected(queue->rps_flow_table, |
|
lockdep_is_held(&rps_dev_flow_lock)); |
|
rcu_assign_pointer(queue->rps_flow_table, table); |
|
spin_unlock(&rps_dev_flow_lock); |
|
|
|
if (old_table) |
|
call_rcu(&old_table->rcu, rps_dev_flow_table_release); |
|
|
|
return len; |
|
} |
|
|
|
static struct rx_queue_attribute rps_cpus_attribute __ro_after_init |
|
= __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map); |
|
|
|
static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init |
|
= __ATTR(rps_flow_cnt, 0644, |
|
show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); |
|
#endif /* CONFIG_RPS */ |
|
|
|
static struct attribute *rx_queue_default_attrs[] __ro_after_init = { |
|
#ifdef CONFIG_RPS |
|
&rps_cpus_attribute.attr, |
|
&rps_dev_flow_table_cnt_attribute.attr, |
|
#endif |
|
NULL |
|
}; |
|
ATTRIBUTE_GROUPS(rx_queue_default); |
|
|
|
static void rx_queue_release(struct kobject *kobj) |
|
{ |
|
struct netdev_rx_queue *queue = to_rx_queue(kobj); |
|
#ifdef CONFIG_RPS |
|
struct rps_map *map; |
|
struct rps_dev_flow_table *flow_table; |
|
|
|
map = rcu_dereference_protected(queue->rps_map, 1); |
|
if (map) { |
|
RCU_INIT_POINTER(queue->rps_map, NULL); |
|
kfree_rcu(map, rcu); |
|
} |
|
|
|
flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); |
|
if (flow_table) { |
|
RCU_INIT_POINTER(queue->rps_flow_table, NULL); |
|
call_rcu(&flow_table->rcu, rps_dev_flow_table_release); |
|
} |
|
#endif |
|
|
|
memset(kobj, 0, sizeof(*kobj)); |
|
dev_put(queue->dev); |
|
} |
|
|
|
static const void *rx_queue_namespace(struct kobject *kobj) |
|
{ |
|
struct netdev_rx_queue *queue = to_rx_queue(kobj); |
|
struct device *dev = &queue->dev->dev; |
|
const void *ns = NULL; |
|
|
|
if (dev->class && dev->class->ns_type) |
|
ns = dev->class->namespace(dev); |
|
|
|
return ns; |
|
} |
|
|
|
static void rx_queue_get_ownership(struct kobject *kobj, |
|
kuid_t *uid, kgid_t *gid) |
|
{ |
|
const struct net *net = rx_queue_namespace(kobj); |
|
|
|
net_ns_get_ownership(net, uid, gid); |
|
} |
|
|
|
static struct kobj_type rx_queue_ktype __ro_after_init = { |
|
.sysfs_ops = &rx_queue_sysfs_ops, |
|
.release = rx_queue_release, |
|
.default_groups = rx_queue_default_groups, |
|
.namespace = rx_queue_namespace, |
|
.get_ownership = rx_queue_get_ownership, |
|
}; |
|
|
|
static int rx_queue_add_kobject(struct net_device *dev, int index) |
|
{ |
|
struct netdev_rx_queue *queue = dev->_rx + index; |
|
struct kobject *kobj = &queue->kobj; |
|
int error = 0; |
|
|
|
/* Kobject_put later will trigger rx_queue_release call which |
|
* decreases dev refcount: Take that reference here |
|
*/ |
|
dev_hold(queue->dev); |
|
|
|
kobj->kset = dev->queues_kset; |
|
error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, |
|
"rx-%u", index); |
|
if (error) |
|
goto err; |
|
|
|
if (dev->sysfs_rx_queue_group) { |
|
error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); |
|
if (error) |
|
goto err; |
|
} |
|
|
|
kobject_uevent(kobj, KOBJ_ADD); |
|
|
|
return error; |
|
|
|
err: |
|
kobject_put(kobj); |
|
return error; |
|
} |
|
|
|
static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid, |
|
kgid_t kgid) |
|
{ |
|
struct netdev_rx_queue *queue = dev->_rx + index; |
|
struct kobject *kobj = &queue->kobj; |
|
int error; |
|
|
|
error = sysfs_change_owner(kobj, kuid, kgid); |
|
if (error) |
|
return error; |
|
|
|
if (dev->sysfs_rx_queue_group) |
|
error = sysfs_group_change_owner( |
|
kobj, dev->sysfs_rx_queue_group, kuid, kgid); |
|
|
|
return error; |
|
} |
|
#endif /* CONFIG_SYSFS */ |
|
|
|
int |
|
net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) |
|
{ |
|
#ifdef CONFIG_SYSFS |
|
int i; |
|
int error = 0; |
|
|
|
#ifndef CONFIG_RPS |
|
if (!dev->sysfs_rx_queue_group) |
|
return 0; |
|
#endif |
|
for (i = old_num; i < new_num; i++) { |
|
error = rx_queue_add_kobject(dev, i); |
|
if (error) { |
|
new_num = old_num; |
|
break; |
|
} |
|
} |
|
|
|
while (--i >= new_num) { |
|
struct kobject *kobj = &dev->_rx[i].kobj; |
|
|
|
if (!refcount_read(&dev_net(dev)->ns.count)) |
|
kobj->uevent_suppress = 1; |
|
if (dev->sysfs_rx_queue_group) |
|
sysfs_remove_group(kobj, dev->sysfs_rx_queue_group); |
|
kobject_put(kobj); |
|
} |
|
|
|
return error; |
|
#else |
|
return 0; |
|
#endif |
|
} |
|
|
|
static int net_rx_queue_change_owner(struct net_device *dev, int num, |
|
kuid_t kuid, kgid_t kgid) |
|
{ |
|
#ifdef CONFIG_SYSFS |
|
int error = 0; |
|
int i; |
|
|
|
#ifndef CONFIG_RPS |
|
if (!dev->sysfs_rx_queue_group) |
|
return 0; |
|
#endif |
|
for (i = 0; i < num; i++) { |
|
error = rx_queue_change_owner(dev, i, kuid, kgid); |
|
if (error) |
|
break; |
|
} |
|
|
|
return error; |
|
#else |
|
return 0; |
|
#endif |
|
} |
|
|
|
#ifdef CONFIG_SYSFS |
|
/* |
|
* netdev_queue sysfs structures and functions. |
|
*/ |
|
struct netdev_queue_attribute { |
|
struct attribute attr; |
|
ssize_t (*show)(struct netdev_queue *queue, char *buf); |
|
ssize_t (*store)(struct netdev_queue *queue, |
|
const char *buf, size_t len); |
|
}; |
|
#define to_netdev_queue_attr(_attr) \ |
|
container_of(_attr, struct netdev_queue_attribute, attr) |
|
|
|
#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) |
|
|
|
static ssize_t netdev_queue_attr_show(struct kobject *kobj, |
|
struct attribute *attr, char *buf) |
|
{ |
|
const struct netdev_queue_attribute *attribute |
|
= to_netdev_queue_attr(attr); |
|
struct netdev_queue *queue = to_netdev_queue(kobj); |
|
|
|
if (!attribute->show) |
|
return -EIO; |
|
|
|
return attribute->show(queue, buf); |
|
} |
|
|
|
static ssize_t netdev_queue_attr_store(struct kobject *kobj, |
|
struct attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
const struct netdev_queue_attribute *attribute |
|
= to_netdev_queue_attr(attr); |
|
struct netdev_queue *queue = to_netdev_queue(kobj); |
|
|
|
if (!attribute->store) |
|
return -EIO; |
|
|
|
return attribute->store(queue, buf, count); |
|
} |
|
|
|
static const struct sysfs_ops netdev_queue_sysfs_ops = { |
|
.show = netdev_queue_attr_show, |
|
.store = netdev_queue_attr_store, |
|
}; |
|
|
|
static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf) |
|
{ |
|
unsigned long trans_timeout; |
|
|
|
spin_lock_irq(&queue->_xmit_lock); |
|
trans_timeout = queue->trans_timeout; |
|
spin_unlock_irq(&queue->_xmit_lock); |
|
|
|
return sprintf(buf, fmt_ulong, trans_timeout); |
|
} |
|
|
|
static unsigned int get_netdev_queue_index(struct netdev_queue *queue) |
|
{ |
|
struct net_device *dev = queue->dev; |
|
unsigned int i; |
|
|
|
i = queue - dev->_tx; |
|
BUG_ON(i >= dev->num_tx_queues); |
|
|
|
return i; |
|
} |
|
|
|
static ssize_t traffic_class_show(struct netdev_queue *queue, |
|
char *buf) |
|
{ |
|
struct net_device *dev = queue->dev; |
|
int num_tc, tc; |
|
int index; |
|
|
|
if (!netif_is_multiqueue(dev)) |
|
return -ENOENT; |
|
|
|
if (!rtnl_trylock()) |
|
return restart_syscall(); |
|
|
|
index = get_netdev_queue_index(queue); |
|
|
|
/* If queue belongs to subordinate dev use its TC mapping */ |
|
dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev; |
|
|
|
num_tc = dev->num_tc; |
|
tc = netdev_txq_to_tc(dev, index); |
|
|
|
rtnl_unlock(); |
|
|
|
if (tc < 0) |
|
return -EINVAL; |
|
|
|
/* We can report the traffic class one of two ways: |
|
* Subordinate device traffic classes are reported with the traffic |
|
* class first, and then the subordinate class so for example TC0 on |
|
* subordinate device 2 will be reported as "0-2". If the queue |
|
* belongs to the root device it will be reported with just the |
|
* traffic class, so just "0" for TC 0 for example. |
|
*/ |
|
return num_tc < 0 ? sprintf(buf, "%d%d\n", tc, num_tc) : |
|
sprintf(buf, "%d\n", tc); |
|
} |
|
|
|
#ifdef CONFIG_XPS |
|
static ssize_t tx_maxrate_show(struct netdev_queue *queue, |
|
char *buf) |
|
{ |
|
return sprintf(buf, "%lu\n", queue->tx_maxrate); |
|
} |
|
|
|
static ssize_t tx_maxrate_store(struct netdev_queue *queue, |
|
const char *buf, size_t len) |
|
{ |
|
struct net_device *dev = queue->dev; |
|
int err, index = get_netdev_queue_index(queue); |
|
u32 rate = 0; |
|
|
|
if (!capable(CAP_NET_ADMIN)) |
|
return -EPERM; |
|
|
|
err = kstrtou32(buf, 10, &rate); |
|
if (err < 0) |
|
return err; |
|
|
|
if (!rtnl_trylock()) |
|
return restart_syscall(); |
|
|
|
err = -EOPNOTSUPP; |
|
if (dev->netdev_ops->ndo_set_tx_maxrate) |
|
err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate); |
|
|
|
rtnl_unlock(); |
|
if (!err) { |
|
queue->tx_maxrate = rate; |
|
return len; |
|
} |
|
return err; |
|
} |
|
|
|
static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init |
|
= __ATTR_RW(tx_maxrate); |
|
#endif |
|
|
|
static struct netdev_queue_attribute queue_trans_timeout __ro_after_init |
|
= __ATTR_RO(tx_timeout); |
|
|
|
static struct netdev_queue_attribute queue_traffic_class __ro_after_init |
|
= __ATTR_RO(traffic_class); |
|
|
|
#ifdef CONFIG_BQL |
|
/* |
|
* Byte queue limits sysfs structures and functions. |
|
*/ |
|
static ssize_t bql_show(char *buf, unsigned int value) |
|
{ |
|
return sprintf(buf, "%u\n", value); |
|
} |
|
|
|
static ssize_t bql_set(const char *buf, const size_t count, |
|
unsigned int *pvalue) |
|
{ |
|
unsigned int value; |
|
int err; |
|
|
|
if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) { |
|
value = DQL_MAX_LIMIT; |
|
} else { |
|
err = kstrtouint(buf, 10, &value); |
|
if (err < 0) |
|
return err; |
|
if (value > DQL_MAX_LIMIT) |
|
return -EINVAL; |
|
} |
|
|
|
*pvalue = value; |
|
|
|
return count; |
|
} |
|
|
|
static ssize_t bql_show_hold_time(struct netdev_queue *queue, |
|
char *buf) |
|
{ |
|
struct dql *dql = &queue->dql; |
|
|
|
return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); |
|
} |
|
|
|
static ssize_t bql_set_hold_time(struct netdev_queue *queue, |
|
const char *buf, size_t len) |
|
{ |
|
struct dql *dql = &queue->dql; |
|
unsigned int value; |
|
int err; |
|
|
|
err = kstrtouint(buf, 10, &value); |
|
if (err < 0) |
|
return err; |
|
|
|
dql->slack_hold_time = msecs_to_jiffies(value); |
|
|
|
return len; |
|
} |
|
|
|
static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init |
|
= __ATTR(hold_time, 0644, |
|
bql_show_hold_time, bql_set_hold_time); |
|
|
|
static ssize_t bql_show_inflight(struct netdev_queue *queue, |
|
char *buf) |
|
{ |
|
struct dql *dql = &queue->dql; |
|
|
|
return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); |
|
} |
|
|
|
static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init = |
|
__ATTR(inflight, 0444, bql_show_inflight, NULL); |
|
|
|
#define BQL_ATTR(NAME, FIELD) \ |
|
static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ |
|
char *buf) \ |
|
{ \ |
|
return bql_show(buf, queue->dql.FIELD); \ |
|
} \ |
|
\ |
|
static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ |
|
const char *buf, size_t len) \ |
|
{ \ |
|
return bql_set(buf, len, &queue->dql.FIELD); \ |
|
} \ |
|
\ |
|
static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \ |
|
= __ATTR(NAME, 0644, \ |
|
bql_show_ ## NAME, bql_set_ ## NAME) |
|
|
|
BQL_ATTR(limit, limit); |
|
BQL_ATTR(limit_max, max_limit); |
|
BQL_ATTR(limit_min, min_limit); |
|
|
|
static struct attribute *dql_attrs[] __ro_after_init = { |
|
&bql_limit_attribute.attr, |
|
&bql_limit_max_attribute.attr, |
|
&bql_limit_min_attribute.attr, |
|
&bql_hold_time_attribute.attr, |
|
&bql_inflight_attribute.attr, |
|
NULL |
|
}; |
|
|
|
static const struct attribute_group dql_group = { |
|
.name = "byte_queue_limits", |
|
.attrs = dql_attrs, |
|
}; |
|
#endif /* CONFIG_BQL */ |
|
|
|
#ifdef CONFIG_XPS |
|
static ssize_t xps_queue_show(struct net_device *dev, unsigned int index, |
|
int tc, char *buf, enum xps_map_type type) |
|
{ |
|
struct xps_dev_maps *dev_maps; |
|
unsigned long *mask; |
|
unsigned int nr_ids; |
|
int j, len; |
|
|
|
rcu_read_lock(); |
|
dev_maps = rcu_dereference(dev->xps_maps[type]); |
|
|
|
/* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0 |
|
* when dev_maps hasn't been allocated yet, to be backward compatible. |
|
*/ |
|
nr_ids = dev_maps ? dev_maps->nr_ids : |
|
(type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues); |
|
|
|
mask = bitmap_zalloc(nr_ids, GFP_NOWAIT); |
|
if (!mask) { |
|
rcu_read_unlock(); |
|
return -ENOMEM; |
|
} |
|
|
|
if (!dev_maps || tc >= dev_maps->num_tc) |
|
goto out_no_maps; |
|
|
|
for (j = 0; j < nr_ids; j++) { |
|
int i, tci = j * dev_maps->num_tc + tc; |
|
struct xps_map *map; |
|
|
|
map = rcu_dereference(dev_maps->attr_map[tci]); |
|
if (!map) |
|
continue; |
|
|
|
for (i = map->len; i--;) { |
|
if (map->queues[i] == index) { |
|
set_bit(j, mask); |
|
break; |
|
} |
|
} |
|
} |
|
out_no_maps: |
|
rcu_read_unlock(); |
|
|
|
len = bitmap_print_to_pagebuf(false, buf, mask, nr_ids); |
|
bitmap_free(mask); |
|
|
|
return len < PAGE_SIZE ? len : -EINVAL; |
|
} |
|
|
|
static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf) |
|
{ |
|
struct net_device *dev = queue->dev; |
|
unsigned int index; |
|
int len, tc; |
|
|
|
if (!netif_is_multiqueue(dev)) |
|
return -ENOENT; |
|
|
|
index = get_netdev_queue_index(queue); |
|
|
|
if (!rtnl_trylock()) |
|
return restart_syscall(); |
|
|
|
/* 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) { |
|
rtnl_unlock(); |
|
return -EINVAL; |
|
} |
|
|
|
/* Make sure the subordinate device can't be freed */ |
|
get_device(&dev->dev); |
|
rtnl_unlock(); |
|
|
|
len = xps_queue_show(dev, index, tc, buf, XPS_CPUS); |
|
|
|
put_device(&dev->dev); |
|
return len; |
|
} |
|
|
|
static ssize_t xps_cpus_store(struct netdev_queue *queue, |
|
const char *buf, size_t len) |
|
{ |
|
struct net_device *dev = queue->dev; |
|
unsigned int index; |
|
cpumask_var_t mask; |
|
int err; |
|
|
|
if (!netif_is_multiqueue(dev)) |
|
return -ENOENT; |
|
|
|
if (!capable(CAP_NET_ADMIN)) |
|
return -EPERM; |
|
|
|
if (!alloc_cpumask_var(&mask, GFP_KERNEL)) |
|
return -ENOMEM; |
|
|
|
index = get_netdev_queue_index(queue); |
|
|
|
err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); |
|
if (err) { |
|
free_cpumask_var(mask); |
|
return err; |
|
} |
|
|
|
if (!rtnl_trylock()) { |
|
free_cpumask_var(mask); |
|
return restart_syscall(); |
|
} |
|
|
|
err = netif_set_xps_queue(dev, mask, index); |
|
rtnl_unlock(); |
|
|
|
free_cpumask_var(mask); |
|
|
|
return err ? : len; |
|
} |
|
|
|
static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init |
|
= __ATTR_RW(xps_cpus); |
|
|
|
static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf) |
|
{ |
|
struct net_device *dev = queue->dev; |
|
unsigned int index; |
|
int tc; |
|
|
|
index = get_netdev_queue_index(queue); |
|
|
|
if (!rtnl_trylock()) |
|
return restart_syscall(); |
|
|
|
tc = netdev_txq_to_tc(dev, index); |
|
rtnl_unlock(); |
|
if (tc < 0) |
|
return -EINVAL; |
|
|
|
return xps_queue_show(dev, index, tc, buf, XPS_RXQS); |
|
} |
|
|
|
static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf, |
|
size_t len) |
|
{ |
|
struct net_device *dev = queue->dev; |
|
struct net *net = dev_net(dev); |
|
unsigned long *mask; |
|
unsigned int index; |
|
int err; |
|
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
|
return -EPERM; |
|
|
|
mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL); |
|
if (!mask) |
|
return -ENOMEM; |
|
|
|
index = get_netdev_queue_index(queue); |
|
|
|
err = bitmap_parse(buf, len, mask, dev->num_rx_queues); |
|
if (err) { |
|
bitmap_free(mask); |
|
return err; |
|
} |
|
|
|
if (!rtnl_trylock()) { |
|
bitmap_free(mask); |
|
return restart_syscall(); |
|
} |
|
|
|
cpus_read_lock(); |
|
err = __netif_set_xps_queue(dev, mask, index, XPS_RXQS); |
|
cpus_read_unlock(); |
|
|
|
rtnl_unlock(); |
|
|
|
bitmap_free(mask); |
|
return err ? : len; |
|
} |
|
|
|
static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init |
|
= __ATTR_RW(xps_rxqs); |
|
#endif /* CONFIG_XPS */ |
|
|
|
static struct attribute *netdev_queue_default_attrs[] __ro_after_init = { |
|
&queue_trans_timeout.attr, |
|
&queue_traffic_class.attr, |
|
#ifdef CONFIG_XPS |
|
&xps_cpus_attribute.attr, |
|
&xps_rxqs_attribute.attr, |
|
&queue_tx_maxrate.attr, |
|
#endif |
|
NULL |
|
}; |
|
ATTRIBUTE_GROUPS(netdev_queue_default); |
|
|
|
static void netdev_queue_release(struct kobject *kobj) |
|
{ |
|
struct netdev_queue *queue = to_netdev_queue(kobj); |
|
|
|
memset(kobj, 0, sizeof(*kobj)); |
|
dev_put(queue->dev); |
|
} |
|
|
|
static const void *netdev_queue_namespace(struct kobject *kobj) |
|
{ |
|
struct netdev_queue *queue = to_netdev_queue(kobj); |
|
struct device *dev = &queue->dev->dev; |
|
const void *ns = NULL; |
|
|
|
if (dev->class && dev->class->ns_type) |
|
ns = dev->class->namespace(dev); |
|
|
|
return ns; |
|
} |
|
|
|
static void netdev_queue_get_ownership(struct kobject *kobj, |
|
kuid_t *uid, kgid_t *gid) |
|
{ |
|
const struct net *net = netdev_queue_namespace(kobj); |
|
|
|
net_ns_get_ownership(net, uid, gid); |
|
} |
|
|
|
static struct kobj_type netdev_queue_ktype __ro_after_init = { |
|
.sysfs_ops = &netdev_queue_sysfs_ops, |
|
.release = netdev_queue_release, |
|
.default_groups = netdev_queue_default_groups, |
|
.namespace = netdev_queue_namespace, |
|
.get_ownership = netdev_queue_get_ownership, |
|
}; |
|
|
|
static int netdev_queue_add_kobject(struct net_device *dev, int index) |
|
{ |
|
struct netdev_queue *queue = dev->_tx + index; |
|
struct kobject *kobj = &queue->kobj; |
|
int error = 0; |
|
|
|
/* Kobject_put later will trigger netdev_queue_release call |
|
* which decreases dev refcount: Take that reference here |
|
*/ |
|
dev_hold(queue->dev); |
|
|
|
kobj->kset = dev->queues_kset; |
|
error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, |
|
"tx-%u", index); |
|
if (error) |
|
goto err; |
|
|
|
#ifdef CONFIG_BQL |
|
error = sysfs_create_group(kobj, &dql_group); |
|
if (error) |
|
goto err; |
|
#endif |
|
|
|
kobject_uevent(kobj, KOBJ_ADD); |
|
return 0; |
|
|
|
err: |
|
kobject_put(kobj); |
|
return error; |
|
} |
|
|
|
static int tx_queue_change_owner(struct net_device *ndev, int index, |
|
kuid_t kuid, kgid_t kgid) |
|
{ |
|
struct netdev_queue *queue = ndev->_tx + index; |
|
struct kobject *kobj = &queue->kobj; |
|
int error; |
|
|
|
error = sysfs_change_owner(kobj, kuid, kgid); |
|
if (error) |
|
return error; |
|
|
|
#ifdef CONFIG_BQL |
|
error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid); |
|
#endif |
|
return error; |
|
} |
|
#endif /* CONFIG_SYSFS */ |
|
|
|
int |
|
netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) |
|
{ |
|
#ifdef CONFIG_SYSFS |
|
int i; |
|
int error = 0; |
|
|
|
for (i = old_num; i < new_num; i++) { |
|
error = netdev_queue_add_kobject(dev, i); |
|
if (error) { |
|
new_num = old_num; |
|
break; |
|
} |
|
} |
|
|
|
while (--i >= new_num) { |
|
struct netdev_queue *queue = dev->_tx + i; |
|
|
|
if (!refcount_read(&dev_net(dev)->ns.count)) |
|
queue->kobj.uevent_suppress = 1; |
|
#ifdef CONFIG_BQL |
|
sysfs_remove_group(&queue->kobj, &dql_group); |
|
#endif |
|
kobject_put(&queue->kobj); |
|
} |
|
|
|
return error; |
|
#else |
|
return 0; |
|
#endif /* CONFIG_SYSFS */ |
|
} |
|
|
|
static int net_tx_queue_change_owner(struct net_device *dev, int num, |
|
kuid_t kuid, kgid_t kgid) |
|
{ |
|
#ifdef CONFIG_SYSFS |
|
int error = 0; |
|
int i; |
|
|
|
for (i = 0; i < num; i++) { |
|
error = tx_queue_change_owner(dev, i, kuid, kgid); |
|
if (error) |
|
break; |
|
} |
|
|
|
return error; |
|
#else |
|
return 0; |
|
#endif /* CONFIG_SYSFS */ |
|
} |
|
|
|
static int register_queue_kobjects(struct net_device *dev) |
|
{ |
|
int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; |
|
|
|
#ifdef CONFIG_SYSFS |
|
dev->queues_kset = kset_create_and_add("queues", |
|
NULL, &dev->dev.kobj); |
|
if (!dev->queues_kset) |
|
return -ENOMEM; |
|
real_rx = dev->real_num_rx_queues; |
|
#endif |
|
real_tx = dev->real_num_tx_queues; |
|
|
|
error = net_rx_queue_update_kobjects(dev, 0, real_rx); |
|
if (error) |
|
goto error; |
|
rxq = real_rx; |
|
|
|
error = netdev_queue_update_kobjects(dev, 0, real_tx); |
|
if (error) |
|
goto error; |
|
txq = real_tx; |
|
|
|
return 0; |
|
|
|
error: |
|
netdev_queue_update_kobjects(dev, txq, 0); |
|
net_rx_queue_update_kobjects(dev, rxq, 0); |
|
#ifdef CONFIG_SYSFS |
|
kset_unregister(dev->queues_kset); |
|
#endif |
|
return error; |
|
} |
|
|
|
static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid) |
|
{ |
|
int error = 0, real_rx = 0, real_tx = 0; |
|
|
|
#ifdef CONFIG_SYSFS |
|
if (ndev->queues_kset) { |
|
error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid); |
|
if (error) |
|
return error; |
|
} |
|
real_rx = ndev->real_num_rx_queues; |
|
#endif |
|
real_tx = ndev->real_num_tx_queues; |
|
|
|
error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid); |
|
if (error) |
|
return error; |
|
|
|
error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid); |
|
if (error) |
|
return error; |
|
|
|
return 0; |
|
} |
|
|
|
static void remove_queue_kobjects(struct net_device *dev) |
|
{ |
|
int real_rx = 0, real_tx = 0; |
|
|
|
#ifdef CONFIG_SYSFS |
|
real_rx = dev->real_num_rx_queues; |
|
#endif |
|
real_tx = dev->real_num_tx_queues; |
|
|
|
net_rx_queue_update_kobjects(dev, real_rx, 0); |
|
netdev_queue_update_kobjects(dev, real_tx, 0); |
|
#ifdef CONFIG_SYSFS |
|
kset_unregister(dev->queues_kset); |
|
#endif |
|
} |
|
|
|
static bool net_current_may_mount(void) |
|
{ |
|
struct net *net = current->nsproxy->net_ns; |
|
|
|
return ns_capable(net->user_ns, CAP_SYS_ADMIN); |
|
} |
|
|
|
static void *net_grab_current_ns(void) |
|
{ |
|
struct net *ns = current->nsproxy->net_ns; |
|
#ifdef CONFIG_NET_NS |
|
if (ns) |
|
refcount_inc(&ns->passive); |
|
#endif |
|
return ns; |
|
} |
|
|
|
static const void *net_initial_ns(void) |
|
{ |
|
return &init_net; |
|
} |
|
|
|
static const void *net_netlink_ns(struct sock *sk) |
|
{ |
|
return sock_net(sk); |
|
} |
|
|
|
const struct kobj_ns_type_operations net_ns_type_operations = { |
|
.type = KOBJ_NS_TYPE_NET, |
|
.current_may_mount = net_current_may_mount, |
|
.grab_current_ns = net_grab_current_ns, |
|
.netlink_ns = net_netlink_ns, |
|
.initial_ns = net_initial_ns, |
|
.drop_ns = net_drop_ns, |
|
}; |
|
EXPORT_SYMBOL_GPL(net_ns_type_operations); |
|
|
|
static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) |
|
{ |
|
struct net_device *dev = to_net_dev(d); |
|
int retval; |
|
|
|
/* pass interface to uevent. */ |
|
retval = add_uevent_var(env, "INTERFACE=%s", dev->name); |
|
if (retval) |
|
goto exit; |
|
|
|
/* pass ifindex to uevent. |
|
* ifindex is useful as it won't change (interface name may change) |
|
* and is what RtNetlink uses natively. |
|
*/ |
|
retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); |
|
|
|
exit: |
|
return retval; |
|
} |
|
|
|
/* |
|
* netdev_release -- destroy and free a dead device. |
|
* Called when last reference to device kobject is gone. |
|
*/ |
|
static void netdev_release(struct device *d) |
|
{ |
|
struct net_device *dev = to_net_dev(d); |
|
|
|
BUG_ON(dev->reg_state != NETREG_RELEASED); |
|
|
|
/* no need to wait for rcu grace period: |
|
* device is dead and about to be freed. |
|
*/ |
|
kfree(rcu_access_pointer(dev->ifalias)); |
|
netdev_freemem(dev); |
|
} |
|
|
|
static const void *net_namespace(struct device *d) |
|
{ |
|
struct net_device *dev = to_net_dev(d); |
|
|
|
return dev_net(dev); |
|
} |
|
|
|
static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid) |
|
{ |
|
struct net_device *dev = to_net_dev(d); |
|
const struct net *net = dev_net(dev); |
|
|
|
net_ns_get_ownership(net, uid, gid); |
|
} |
|
|
|
static struct class net_class __ro_after_init = { |
|
.name = "net", |
|
.dev_release = netdev_release, |
|
.dev_groups = net_class_groups, |
|
.dev_uevent = netdev_uevent, |
|
.ns_type = &net_ns_type_operations, |
|
.namespace = net_namespace, |
|
.get_ownership = net_get_ownership, |
|
}; |
|
|
|
#ifdef CONFIG_OF_NET |
|
static int of_dev_node_match(struct device *dev, const void *data) |
|
{ |
|
for (; dev; dev = dev->parent) { |
|
if (dev->of_node == data) |
|
return 1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* of_find_net_device_by_node - lookup the net device for the device node |
|
* @np: OF device node |
|
* |
|
* Looks up the net_device structure corresponding with the device node. |
|
* If successful, returns a pointer to the net_device with the embedded |
|
* struct device refcount incremented by one, or NULL on failure. The |
|
* refcount must be dropped when done with the net_device. |
|
*/ |
|
struct net_device *of_find_net_device_by_node(struct device_node *np) |
|
{ |
|
struct device *dev; |
|
|
|
dev = class_find_device(&net_class, NULL, np, of_dev_node_match); |
|
if (!dev) |
|
return NULL; |
|
|
|
return to_net_dev(dev); |
|
} |
|
EXPORT_SYMBOL(of_find_net_device_by_node); |
|
#endif |
|
|
|
/* Delete sysfs entries but hold kobject reference until after all |
|
* netdev references are gone. |
|
*/ |
|
void netdev_unregister_kobject(struct net_device *ndev) |
|
{ |
|
struct device *dev = &ndev->dev; |
|
|
|
if (!refcount_read(&dev_net(ndev)->ns.count)) |
|
dev_set_uevent_suppress(dev, 1); |
|
|
|
kobject_get(&dev->kobj); |
|
|
|
remove_queue_kobjects(ndev); |
|
|
|
pm_runtime_set_memalloc_noio(dev, false); |
|
|
|
device_del(dev); |
|
} |
|
|
|
/* Create sysfs entries for network device. */ |
|
int netdev_register_kobject(struct net_device *ndev) |
|
{ |
|
struct device *dev = &ndev->dev; |
|
const struct attribute_group **groups = ndev->sysfs_groups; |
|
int error = 0; |
|
|
|
device_initialize(dev); |
|
dev->class = &net_class; |
|
dev->platform_data = ndev; |
|
dev->groups = groups; |
|
|
|
dev_set_name(dev, "%s", ndev->name); |
|
|
|
#ifdef CONFIG_SYSFS |
|
/* Allow for a device specific group */ |
|
if (*groups) |
|
groups++; |
|
|
|
*groups++ = &netstat_group; |
|
|
|
#if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) |
|
if (ndev->ieee80211_ptr) |
|
*groups++ = &wireless_group; |
|
#if IS_ENABLED(CONFIG_WIRELESS_EXT) |
|
else if (ndev->wireless_handlers) |
|
*groups++ = &wireless_group; |
|
#endif |
|
#endif |
|
#endif /* CONFIG_SYSFS */ |
|
|
|
error = device_add(dev); |
|
if (error) |
|
return error; |
|
|
|
error = register_queue_kobjects(ndev); |
|
if (error) { |
|
device_del(dev); |
|
return error; |
|
} |
|
|
|
pm_runtime_set_memalloc_noio(dev, true); |
|
|
|
return error; |
|
} |
|
|
|
/* Change owner for sysfs entries when moving network devices across network |
|
* namespaces owned by different user namespaces. |
|
*/ |
|
int netdev_change_owner(struct net_device *ndev, const struct net *net_old, |
|
const struct net *net_new) |
|
{ |
|
struct device *dev = &ndev->dev; |
|
kuid_t old_uid, new_uid; |
|
kgid_t old_gid, new_gid; |
|
int error; |
|
|
|
net_ns_get_ownership(net_old, &old_uid, &old_gid); |
|
net_ns_get_ownership(net_new, &new_uid, &new_gid); |
|
|
|
/* The network namespace was changed but the owning user namespace is |
|
* identical so there's no need to change the owner of sysfs entries. |
|
*/ |
|
if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid)) |
|
return 0; |
|
|
|
error = device_change_owner(dev, new_uid, new_gid); |
|
if (error) |
|
return error; |
|
|
|
error = queue_change_owner(ndev, new_uid, new_gid); |
|
if (error) |
|
return error; |
|
|
|
return 0; |
|
} |
|
|
|
int netdev_class_create_file_ns(const struct class_attribute *class_attr, |
|
const void *ns) |
|
{ |
|
return class_create_file_ns(&net_class, class_attr, ns); |
|
} |
|
EXPORT_SYMBOL(netdev_class_create_file_ns); |
|
|
|
void netdev_class_remove_file_ns(const struct class_attribute *class_attr, |
|
const void *ns) |
|
{ |
|
class_remove_file_ns(&net_class, class_attr, ns); |
|
} |
|
EXPORT_SYMBOL(netdev_class_remove_file_ns); |
|
|
|
int __init netdev_kobject_init(void) |
|
{ |
|
kobj_ns_type_register(&net_ns_type_operations); |
|
return class_register(&net_class); |
|
}
|
|
|