| /* |
| * net-sysfs.c - network device class and attributes |
| * |
| * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org> |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/capability.h> |
| #include <linux/kernel.h> |
| #include <linux/netdevice.h> |
| #include <net/switchdev.h> |
| #include <linux/if_arp.h> |
| #include <linux/slab.h> |
| #include <linux/nsproxy.h> |
| #include <net/sock.h> |
| #include <net/net_namespace.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/vmalloc.h> |
| #include <linux/export.h> |
| #include <linux/jiffies.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/of.h> |
| |
| #include "net-sysfs.h" |
| |
| #ifdef CONFIG_SYSFS |
| static const char fmt_hex[] = "%#x\n"; |
| static const char fmt_long_hex[] = "%#lx\n"; |
| static const char fmt_dec[] = "%d\n"; |
| static const char fmt_udec[] = "%u\n"; |
| static const char fmt_ulong[] = "%lu\n"; |
| static const char fmt_u64[] = "%llu\n"; |
| |
| static inline int dev_isalive(const struct net_device *dev) |
| { |
| return dev->reg_state <= NETREG_REGISTERED; |
| } |
| |
| /* use same locking rules as GIF* ioctl's */ |
| static ssize_t netdev_show(const struct device *dev, |
| struct device_attribute *attr, char *buf, |
| ssize_t (*format)(const struct net_device *, char *)) |
| { |
| struct net_device *ndev = to_net_dev(dev); |
| ssize_t ret = -EINVAL; |
| |
| read_lock(&dev_base_lock); |
| if (dev_isalive(ndev)) |
| ret = (*format)(ndev, buf); |
| read_unlock(&dev_base_lock); |
| |
| return ret; |
| } |
| |
| /* generate a show function for simple field */ |
| #define NETDEVICE_SHOW(field, format_string) \ |
| static ssize_t format_##field(const struct net_device *dev, char *buf) \ |
| { \ |
| return sprintf(buf, format_string, dev->field); \ |
| } \ |
| static ssize_t field##_show(struct device *dev, \ |
| struct device_attribute *attr, char *buf) \ |
| { \ |
| return netdev_show(dev, attr, buf, format_##field); \ |
| } \ |
| |
| #define NETDEVICE_SHOW_RO(field, format_string) \ |
| NETDEVICE_SHOW(field, format_string); \ |
| static DEVICE_ATTR_RO(field) |
| |
| #define NETDEVICE_SHOW_RW(field, format_string) \ |
| NETDEVICE_SHOW(field, format_string); \ |
| static DEVICE_ATTR_RW(field) |
| |
| /* use same locking and permission rules as SIF* ioctl's */ |
| static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t len, |
| int (*set)(struct net_device *, unsigned long)) |
| { |
| struct net_device *netdev = to_net_dev(dev); |
| struct net *net = dev_net(netdev); |
| unsigned long new; |
| int ret = -EINVAL; |
| |
| if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| return -EPERM; |
| |
| ret = kstrtoul(buf, 0, &new); |
| if (ret) |
| goto err; |
| |
| if (!rtnl_trylock()) |
| return restart_syscall(); |
| |
| if (dev_isalive(netdev)) { |
| if ((ret = (*set)(netdev, new)) == 0) |
| ret = len; |
| } |
| rtnl_unlock(); |
| err: |
| return ret; |
| } |
| |
| NETDEVICE_SHOW_RO(dev_id, fmt_hex); |
| NETDEVICE_SHOW_RO(dev_port, fmt_dec); |
| NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec); |
| NETDEVICE_SHOW_RO(addr_len, fmt_dec); |
| NETDEVICE_SHOW_RO(iflink, fmt_dec); |
| NETDEVICE_SHOW_RO(ifindex, fmt_dec); |
| NETDEVICE_SHOW_RO(type, fmt_dec); |
| NETDEVICE_SHOW_RO(link_mode, fmt_dec); |
| |
| static ssize_t format_name_assign_type(const struct net_device *dev, char *buf) |
| { |
| return sprintf(buf, fmt_dec, dev->name_assign_type); |
| } |
| |
| static ssize_t name_assign_type_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct net_device *ndev = to_net_dev(dev); |
| ssize_t ret = -EINVAL; |
| |
| if (ndev->name_assign_type != NET_NAME_UNKNOWN) |
| ret = netdev_show(dev, attr, buf, format_name_assign_type); |
| |
| return ret; |
| } |
| static DEVICE_ATTR_RO(name_assign_type); |
| |
| /* use same locking rules as GIFHWADDR ioctl's */ |
| static ssize_t address_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct net_device *ndev = to_net_dev(dev); |
| ssize_t ret = -EINVAL; |
| |
| read_lock(&dev_base_lock); |
| if (dev_isalive(ndev)) |
| ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len); |
| read_unlock(&dev_base_lock); |
| return ret; |
| } |
| static DEVICE_ATTR_RO(address); |
| |
| static ssize_t broadcast_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct net_device *ndev = to_net_dev(dev); |
| if (dev_isalive(ndev)) |
| return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len); |
| return -EINVAL; |
| } |
| static DEVICE_ATTR_RO(broadcast); |
| |
| static int change_carrier(struct net_device *dev, unsigned long new_carrier) |
| { |
| if (!netif_running(dev)) |
| return -EINVAL; |
| return dev_change_carrier(dev, (bool) new_carrier); |
| } |
| |
| static ssize_t carrier_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| return netdev_store(dev, attr, buf, len, change_carrier); |
| } |
| |
| static ssize_t carrier_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct net_device *netdev = to_net_dev(dev); |
| if (netif_running(netdev)) { |
| return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); |
| } |
| return -EINVAL; |
| } |
| static DEVICE_ATTR_RW(carrier); |
| |
| static ssize_t speed_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct net_device *netdev = to_net_dev(dev); |
| int ret = -EINVAL; |
| |
| if (!rtnl_trylock()) |
| return restart_syscall(); |
| |
| if (netif_running(netdev)) { |
| struct ethtool_cmd cmd; |
| if (!__ethtool_get_settings(netdev, &cmd)) |
| ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd)); |
| } |
| rtnl_unlock(); |
| return ret; |
| } |
| static DEVICE_ATTR_RO(speed); |
| |
| static ssize_t duplex_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct net_device *netdev = to_net_dev(dev); |
| int ret = -EINVAL; |
| |
| if (!rtnl_trylock()) |
| return restart_syscall(); |
| |
| if (netif_running(netdev)) { |
| struct ethtool_cmd cmd; |
| if (!__ethtool_get_settings(netdev, &cmd)) { |
| const char *duplex; |
| switch (cmd.duplex) { |
| case DUPLEX_HALF: |
| duplex = "half"; |
| break; |
| case DUPLEX_FULL: |
| duplex = "full"; |
| break; |
| default: |
| duplex = "unknown"; |
| break; |
| } |
| ret = sprintf(buf, "%s\n", duplex); |
| } |
| } |
| rtnl_unlock(); |
| return ret; |
| } |
| static DEVICE_ATTR_RO(duplex); |
| |
| static ssize_t dormant_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct net_device *netdev = to_net_dev(dev); |
| |
| if (netif_running(netdev)) |
| return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); |
| |
| return -EINVAL; |
| } |
| static DEVICE_ATTR_RO(dormant); |
| |
| static const char *const operstates[] = { |
| "unknown", |
| "notpresent", /* currently unused */ |
| "down", |
| "lowerlayerdown", |
| "testing", /* currently unused */ |
| "dormant", |
| "up" |
| }; |
| |
| static ssize_t operstate_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| const struct net_device *netdev = to_net_dev(dev); |
| unsigned char operstate; |
| |
| read_lock(&dev_base_lock); |
| operstate = netdev->operstate; |
| if (!netif_running(netdev)) |
| operstate = IF_OPER_DOWN; |
| read_unlock(&dev_base_lock); |
| |
| if (operstate >= ARRAY_SIZE(operstates)) |
| return -EINVAL; /* should not happen */ |
| |
| return sprintf(buf, "%s\n", operstates[operstate]); |
| } |
| static DEVICE_ATTR_RO(operstate); |
| |
| static ssize_t carrier_changes_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct net_device *netdev = to_net_dev(dev); |
| return sprintf(buf, fmt_dec, |
| atomic_read(&netdev->carrier_changes)); |
| } |
| static DEVICE_ATTR_RO(carrier_changes); |
| |
| /* read-write attributes */ |
| |
| static int change_mtu(struct net_device *dev, unsigned long new_mtu) |
| { |
| return dev_set_mtu(dev, (int) new_mtu); |
| } |
| |
| static ssize_t mtu_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| return netdev_store(dev, attr, buf, len, change_mtu); |
| } |
| NETDEVICE_SHOW_RW(mtu, fmt_dec); |
| |
| static int change_flags(struct net_device *dev, unsigned long new_flags) |
| { |
| return dev_change_flags(dev, (unsigned int) new_flags); |
| } |
| |
| static ssize_t flags_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| return netdev_store(dev, attr, buf, len, change_flags); |
| } |
| NETDEVICE_SHOW_RW(flags, fmt_hex); |
| |
| static int change_tx_queue_len(struct net_device *dev, unsigned long new_len) |
| { |
| dev->tx_queue_len = new_len; |
| return 0; |
| } |
| |
| static ssize_t tx_queue_len_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| if (!capable(CAP_NET_ADMIN)) |
| return -EPERM; |
| |
| return netdev_store(dev, attr, buf, len, change_tx_queue_len); |
| } |
| NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong); |
| |
| static int change_gro_flush_timeout(struct net_device *dev, unsigned long val) |
| { |
| dev->gro_flush_timeout = val; |
| return 0; |
| } |
| |
| static ssize_t gro_flush_timeout_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| if (!capable(CAP_NET_ADMIN)) |
| return -EPERM; |
| |
| return netdev_store(dev, attr, buf, len, change_gro_flush_timeout); |
| } |
| NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong); |
| |
| static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| struct net_device *netdev = to_net_dev(dev); |
| struct net *net = dev_net(netdev); |
| size_t count = len; |
| ssize_t ret; |
| |
| if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
| return -EPERM; |
| |
| /* ignore trailing newline */ |
| if (len > 0 && buf[len - 1] == '\n') |
| --count; |
| |
| if (!rtnl_trylock()) |
| return restart_syscall(); |
| ret = dev_set_alias(netdev, buf, count); |
| rtnl_unlock(); |
| |
| return ret < 0 ? ret : len; |
| } |
| |
| static ssize_t ifalias_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| const struct net_device *netdev = to_net_dev(dev); |
| ssize_t ret = 0; |
| |
| if (!rtnl_trylock()) |
| return restart_syscall(); |
| if (netdev->ifalias) |
| ret = sprintf(buf, "%s\n", netdev->ifalias); |
| rtnl_unlock(); |
| return ret; |
| } |
| static DEVICE_ATTR_RW(ifalias); |
| |
| static int change_group(struct net_device *dev, unsigned long new_group) |
| { |
| dev_set_group(dev, (int) new_group); |
| return 0; |
| } |
| |
| static ssize_t group_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t len) |
| { |
| return netdev_store(dev, attr, buf, len, change_group); |
| } |
| NETDEVICE_SHOW(group, fmt_dec); |
| static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store); |
| |
| static ssize_t phys_port_id_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct net_device *netdev = to_net_dev(dev); |
| ssize_t ret = -EINVAL; |
| |
| if (!rtnl_trylock()) |
| return restart_syscall(); |
| |
| if (dev_isalive(netdev)) { |
| struct netdev_phys_item_id ppid; |
| |
| ret = dev_get_phys_port_id(netdev, &ppid); |
| if (!ret) |
| ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); |
| } |
| rtnl_unlock(); |
| |
| return ret; |
| } |
| static DEVICE_ATTR_RO(phys_port_id); |
| |
| static ssize_t phys_switch_id_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct net_device *netdev = to_net_dev(dev); |
| ssize_t ret = -EINVAL; |
| |
| if (!rtnl_trylock()) |
| return restart_syscall(); |
| |
| if (dev_isalive(netdev)) { |
| struct netdev_phys_item_id ppid; |
| |
| ret = netdev_switch_parent_id_get(netdev, &ppid); |
| if (!ret) |
| ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); |
| } |
| rtnl_unlock(); |
| |
| return ret; |
| } |
| static DEVICE_ATTR_RO(phys_switch_id); |
| |
| static struct attribute *net_class_attrs[] = { |
| &dev_attr_netdev_group.attr, |
| &dev_attr_type.attr, |
| &dev_attr_dev_id.attr, |
| &dev_attr_dev_port.attr, |
| &dev_attr_iflink.attr, |
| &dev_attr_ifindex.attr, |
| &dev_attr_name_assign_type.attr, |
| &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_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_phys_port_id.attr, |
| &dev_attr_phys_switch_id.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); |
| |
| static struct attribute *netstat_attrs[] = { |
| &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, |
| NULL |
| }; |
| |
| |
| static 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 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) |
| { |
| 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, attribute, buf); |
| } |
| |
| static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, |
| const char *buf, size_t count) |
| { |
| 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, attribute, 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, |
| struct rx_queue_attribute *attribute, 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, |
| struct rx_queue_attribute *attribute, |
| const char *buf, size_t len) |
| { |
| struct rps_map *old_map, *map; |
| cpumask_var_t mask; |
| int err, cpu, i; |
| static DEFINE_SPINLOCK(rps_map_lock); |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| spin_lock(&rps_map_lock); |
| old_map = rcu_dereference_protected(queue->rps_map, |
| lockdep_is_held(&rps_map_lock)); |
| rcu_assign_pointer(queue->rps_map, map); |
| spin_unlock(&rps_map_lock); |
| |
| if (map) |
| static_key_slow_inc(&rps_needed); |
| if (old_map) { |
| kfree_rcu(old_map, rcu); |
| static_key_slow_dec(&rps_needed); |
| } |
| free_cpumask_var(mask); |
| return len; |
| } |
| |
| static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, |
| struct rx_queue_attribute *attr, |
| 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, |
| struct rx_queue_attribute *attr, |
| 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 = |
| __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); |
| |
| |
| static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = |
| __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, |
| show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); |
| #endif /* CONFIG_RPS */ |
| |
| static struct attribute *rx_queue_default_attrs[] = { |
| #ifdef CONFIG_RPS |
| &rps_cpus_attribute.attr, |
| &rps_dev_flow_table_cnt_attribute.attr, |
| #endif |
| NULL |
| }; |
| |
| 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 struct kobj_type rx_queue_ktype = { |
| .sysfs_ops = &rx_queue_sysfs_ops, |
| .release = rx_queue_release, |
| .default_attrs = rx_queue_default_attrs, |
| .namespace = rx_queue_namespace |
| }; |
| |
| 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; |
| |
| kobj->kset = dev->queues_kset; |
| error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, |
| "rx-%u", index); |
| if (error) |
| goto exit; |
| |
| if (dev->sysfs_rx_queue_group) { |
| error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); |
| if (error) |
| goto exit; |
| } |
| |
| kobject_uevent(kobj, KOBJ_ADD); |
| dev_hold(queue->dev); |
| |
| return error; |
| exit: |
| kobject_put(kobj); |
| 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) { |
| if (dev->sysfs_rx_queue_group) |
| sysfs_remove_group(&dev->_rx[i].kobj, |
| dev->sysfs_rx_queue_group); |
| kobject_put(&dev->_rx[i].kobj); |
| } |
| |
| 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, |
| struct netdev_queue_attribute *attr, char *buf); |
| ssize_t (*store)(struct netdev_queue *queue, |
| struct netdev_queue_attribute *attr, 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) |
| { |
| 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, attribute, buf); |
| } |
| |
| static ssize_t netdev_queue_attr_store(struct kobject *kobj, |
| struct attribute *attr, |
| const char *buf, size_t count) |
| { |
| 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, attribute, buf, count); |
| } |
| |
| static const struct sysfs_ops netdev_queue_sysfs_ops = { |
| .show = netdev_queue_attr_show, |
| .store = netdev_queue_attr_store, |
| }; |
| |
| static ssize_t show_trans_timeout(struct netdev_queue *queue, |
| struct netdev_queue_attribute *attribute, |
| 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, "%lu", trans_timeout); |
| } |
| |
| #ifdef CONFIG_XPS |
| static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue) |
| { |
| struct net_device *dev = queue->dev; |
| int i; |
| |
| for (i = 0; i < dev->num_tx_queues; i++) |
| if (queue == &dev->_tx[i]) |
| break; |
| |
| BUG_ON(i >= dev->num_tx_queues); |
| |
| return i; |
| } |
| |
| static ssize_t show_tx_maxrate(struct netdev_queue *queue, |
| struct netdev_queue_attribute *attribute, |
| char *buf) |
| { |
| return sprintf(buf, "%lu\n", queue->tx_maxrate); |
| } |
| |
| static ssize_t set_tx_maxrate(struct netdev_queue *queue, |
| struct netdev_queue_attribute *attribute, |
| const char *buf, size_t len) |
| { |
| struct net_device *dev = queue->dev; |
| int err, index = get_netdev_queue_index(queue); |
| u32 rate = 0; |
| |
| 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 = |
| __ATTR(tx_maxrate, S_IRUGO | S_IWUSR, |
| show_tx_maxrate, set_tx_maxrate); |
| #endif |
| |
| static struct netdev_queue_attribute queue_trans_timeout = |
| __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL); |
| |
| #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, |
| struct netdev_queue_attribute *attr, |
| 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, |
| struct netdev_queue_attribute *attribute, |
| 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 = |
| __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time, |
| bql_set_hold_time); |
| |
| static ssize_t bql_show_inflight(struct netdev_queue *queue, |
| struct netdev_queue_attribute *attr, |
| 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 = |
| __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL); |
| |
| #define BQL_ATTR(NAME, FIELD) \ |
| static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ |
| struct netdev_queue_attribute *attr, \ |
| char *buf) \ |
| { \ |
| return bql_show(buf, queue->dql.FIELD); \ |
| } \ |
| \ |
| static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ |
| struct netdev_queue_attribute *attr, \ |
| const char *buf, size_t len) \ |
| { \ |
| return bql_set(buf, len, &queue->dql.FIELD); \ |
| } \ |
| \ |
| static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \ |
| __ATTR(NAME, S_IRUGO | S_IWUSR, 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[] = { |
| &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 struct attribute_group dql_group = { |
| .name = "byte_queue_limits", |
| .attrs = dql_attrs, |
| }; |
| #endif /* CONFIG_BQL */ |
| |
| #ifdef CONFIG_XPS |
| static ssize_t show_xps_map(struct netdev_queue *queue, |
| struct netdev_queue_attribute *attribute, char *buf) |
| { |
| struct net_device *dev = queue->dev; |
| struct xps_dev_maps *dev_maps; |
| cpumask_var_t mask; |
| unsigned long index; |
| int i, len; |
| |
| if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) |
| return -ENOMEM; |
| |
| index = get_netdev_queue_index(queue); |
| |
| rcu_read_lock(); |
| dev_maps = rcu_dereference(dev->xps_maps); |
| if (dev_maps) { |
| for_each_possible_cpu(i) { |
| struct xps_map *map = |
| rcu_dereference(dev_maps->cpu_map[i]); |
| if (map) { |
| int j; |
| for (j = 0; j < map->len; j++) { |
| if (map->queues[j] == index) { |
| cpumask_set_cpu(i, mask); |
| break; |
| } |
| } |
| } |
| } |
| } |
| rcu_read_unlock(); |
| |
| len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); |
| free_cpumask_var(mask); |
| return len < PAGE_SIZE ? len : -EINVAL; |
| } |
| |
| static ssize_t store_xps_map(struct netdev_queue *queue, |
| struct netdev_queue_attribute *attribute, |
| const char *buf, size_t len) |
| { |
| struct net_device *dev = queue->dev; |
| unsigned long index; |
| cpumask_var_t mask; |
| int err; |
| |
| 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; |
| } |
| |
| err = netif_set_xps_queue(dev, mask, index); |
| |
| free_cpumask_var(mask); |
| |
| return err ? : len; |
| } |
| |
| static struct netdev_queue_attribute xps_cpus_attribute = |
| __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map); |
| #endif /* CONFIG_XPS */ |
| |
| static struct attribute *netdev_queue_default_attrs[] = { |
| &queue_trans_timeout.attr, |
| #ifdef CONFIG_XPS |
| &xps_cpus_attribute.attr, |
| &queue_tx_maxrate.attr, |
| #endif |
| NULL |
| }; |
| |
| 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 struct kobj_type netdev_queue_ktype = { |
| .sysfs_ops = &netdev_queue_sysfs_ops, |
| .release = netdev_queue_release, |
| .default_attrs = netdev_queue_default_attrs, |
| .namespace = netdev_queue_namespace, |
| }; |
| |
| 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; |
| |
| kobj->kset = dev->queues_kset; |
| error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, |
| "tx-%u", index); |
| if (error) |
| goto exit; |
| |
| #ifdef CONFIG_BQL |
| error = sysfs_create_group(kobj, &dql_group); |
| if (error) |
| goto exit; |
| #endif |
| |
| kobject_uevent(kobj, KOBJ_ADD); |
| dev_hold(queue->dev); |
| |
| return 0; |
| exit: |
| kobject_put(kobj); |
| 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; |
| |
| #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 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); |
| return error; |
| } |
| |
| 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) |
| atomic_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); |
| } |
| |
| 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); |
| |
| kfree(dev->ifalias); |
| netdev_freemem(dev); |
| } |
| |
| static const void *net_namespace(struct device *d) |
| { |
| struct net_device *dev; |
| dev = container_of(d, struct net_device, dev); |
| return dev_net(dev); |
| } |
| |
| static struct class net_class = { |
| .name = "net", |
| .dev_release = netdev_release, |
| .dev_groups = net_class_groups, |
| .dev_uevent = netdev_uevent, |
| .ns_type = &net_ns_type_operations, |
| .namespace = net_namespace, |
| }; |
| |
| #ifdef CONFIG_OF_NET |
| static int of_dev_node_match(struct device *dev, const void *data) |
| { |
| int ret = 0; |
| |
| if (dev->parent) |
| ret = dev->parent->of_node == data; |
| |
| return ret == 0 ? dev->of_node == data : ret; |
| } |
| |
| 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); |
| |
| 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; |
| } |
| |
| int netdev_class_create_file_ns(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(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); |
| } |