diff options
Diffstat (limited to 'net/core/net-sysfs.c')
| -rw-r--r-- | net/core/net-sysfs.c | 1339 |
1 files changed, 1339 insertions, 0 deletions
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c new file mode 100644 index 00000000..33d2a1fb --- /dev/null +++ b/net/core/net-sysfs.c @@ -0,0 +1,1339 @@ +/* + * 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 <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/wireless.h> +#include <linux/vmalloc.h> +#include <net/wext.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 *net = to_net_dev(dev); + ssize_t ret = -EINVAL; + + read_lock(&dev_base_lock); + if (dev_isalive(net)) + ret = (*format)(net, 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 *net, char *buf) \ +{ \ + return sprintf(buf, format_string, net->field); \ +} \ +static ssize_t show_##field(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + return netdev_show(dev, attr, buf, format_##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 *net = to_net_dev(dev); + char *endp; + unsigned long new; + int ret = -EINVAL; + + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + + new = simple_strtoul(buf, &endp, 0); + if (endp == buf) + goto err; + + if (!rtnl_trylock()) + return restart_syscall(); + + if (dev_isalive(net)) { + if ((ret = (*set)(net, new)) == 0) + ret = len; + } + rtnl_unlock(); + err: + return ret; +} + +NETDEVICE_SHOW(dev_id, fmt_hex); +NETDEVICE_SHOW(addr_assign_type, fmt_dec); +NETDEVICE_SHOW(addr_len, fmt_dec); +NETDEVICE_SHOW(iflink, fmt_dec); +NETDEVICE_SHOW(ifindex, fmt_dec); +NETDEVICE_SHOW(features, fmt_hex); +NETDEVICE_SHOW(type, fmt_dec); +NETDEVICE_SHOW(link_mode, fmt_dec); + +/* use same locking rules as GIFHWADDR ioctl's */ +static ssize_t show_address(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct net_device *net = to_net_dev(dev); + ssize_t ret = -EINVAL; + + read_lock(&dev_base_lock); + if (dev_isalive(net)) + ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len); + read_unlock(&dev_base_lock); + return ret; +} + +static ssize_t show_broadcast(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct net_device *net = to_net_dev(dev); + if (dev_isalive(net)) + return sysfs_format_mac(buf, net->broadcast, net->addr_len); + return -EINVAL; +} + +static ssize_t show_carrier(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 ssize_t show_speed(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 (!dev_ethtool_get_settings(netdev, &cmd)) + ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd)); + } + rtnl_unlock(); + return ret; +} + +static ssize_t show_duplex(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 (!dev_ethtool_get_settings(netdev, &cmd)) + ret = sprintf(buf, "%s\n", + cmd.duplex ? "full" : "half"); + } + rtnl_unlock(); + return ret; +} + +static ssize_t show_dormant(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 const char *const operstates[] = { + "unknown", + "notpresent", /* currently unused */ + "down", + "lowerlayerdown", + "testing", /* currently unused */ + "dormant", + "up" +}; + +static ssize_t show_operstate(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]); +} + +/* read-write attributes */ +NETDEVICE_SHOW(mtu, fmt_dec); + +static int change_mtu(struct net_device *net, unsigned long new_mtu) +{ + return dev_set_mtu(net, (int) new_mtu); +} + +static ssize_t store_mtu(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + return netdev_store(dev, attr, buf, len, change_mtu); +} + +NETDEVICE_SHOW(flags, fmt_hex); + +static int change_flags(struct net_device *net, unsigned long new_flags) +{ + return dev_change_flags(net, (unsigned) new_flags); +} + +static ssize_t store_flags(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + return netdev_store(dev, attr, buf, len, change_flags); +} + +NETDEVICE_SHOW(tx_queue_len, fmt_ulong); + +static int change_tx_queue_len(struct net_device *net, unsigned long new_len) +{ + net->tx_queue_len = new_len; + return 0; +} + +static ssize_t store_tx_queue_len(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + return netdev_store(dev, attr, buf, len, change_tx_queue_len); +} + +static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + struct net_device *netdev = to_net_dev(dev); + size_t count = len; + ssize_t ret; + + if (!capable(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 show_ifalias(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; +} + +NETDEVICE_SHOW(group, fmt_dec); + +static int change_group(struct net_device *net, unsigned long new_group) +{ + dev_set_group(net, (int) new_group); + return 0; +} + +static ssize_t store_group(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + return netdev_store(dev, attr, buf, len, change_group); +} + +static struct device_attribute net_class_attributes[] = { + __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL), + __ATTR(addr_len, S_IRUGO, show_addr_len, NULL), + __ATTR(dev_id, S_IRUGO, show_dev_id, NULL), + __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias), + __ATTR(iflink, S_IRUGO, show_iflink, NULL), + __ATTR(ifindex, S_IRUGO, show_ifindex, NULL), + __ATTR(features, S_IRUGO, show_features, NULL), + __ATTR(type, S_IRUGO, show_type, NULL), + __ATTR(link_mode, S_IRUGO, show_link_mode, NULL), + __ATTR(address, S_IRUGO, show_address, NULL), + __ATTR(broadcast, S_IRUGO, show_broadcast, NULL), + __ATTR(carrier, S_IRUGO, show_carrier, NULL), + __ATTR(speed, S_IRUGO, show_speed, NULL), + __ATTR(duplex, S_IRUGO, show_duplex, NULL), + __ATTR(dormant, S_IRUGO, show_dormant, NULL), + __ATTR(operstate, S_IRUGO, show_operstate, NULL), + __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu), + __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags), + __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len, + store_tx_queue_len), + __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group), + {} +}; + +/* 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 show_##name(struct device *d, \ + struct device_attribute *attr, char *buf) \ +{ \ + return netstat_show(d, attr, buf, \ + offsetof(struct rtnl_link_stats64, name)); \ +} \ +static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) + +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, +}; + +#ifdef CONFIG_WIRELESS_EXT_SYSFS +/* helper function that does all the locking etc for wireless stats */ +static ssize_t wireless_show(struct device *d, char *buf, + ssize_t (*format)(const struct iw_statistics *, + char *)) +{ + struct net_device *dev = to_net_dev(d); + const struct iw_statistics *iw; + ssize_t ret = -EINVAL; + + if (!rtnl_trylock()) + return restart_syscall(); + if (dev_isalive(dev)) { + iw = get_wireless_stats(dev); + if (iw) + ret = (*format)(iw, buf); + } + rtnl_unlock(); + + return ret; +} + +/* show function template for wireless fields */ +#define WIRELESS_SHOW(name, field, format_string) \ +static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \ +{ \ + return sprintf(buf, format_string, iw->field); \ +} \ +static ssize_t show_iw_##name(struct device *d, \ + struct device_attribute *attr, char *buf) \ +{ \ + return wireless_show(d, buf, format_iw_##name); \ +} \ +static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL) + +WIRELESS_SHOW(status, status, fmt_hex); +WIRELESS_SHOW(link, qual.qual, fmt_dec); +WIRELESS_SHOW(level, qual.level, fmt_dec); +WIRELESS_SHOW(noise, qual.noise, fmt_dec); +WIRELESS_SHOW(nwid, discard.nwid, fmt_dec); +WIRELESS_SHOW(crypt, discard.code, fmt_dec); +WIRELESS_SHOW(fragment, discard.fragment, fmt_dec); +WIRELESS_SHOW(misc, discard.misc, fmt_dec); +WIRELESS_SHOW(retries, discard.retries, fmt_dec); +WIRELESS_SHOW(beacon, miss.beacon, fmt_dec); + +static struct attribute *wireless_attrs[] = { + &dev_attr_status.attr, + &dev_attr_link.attr, + &dev_attr_level.attr, + &dev_attr_noise.attr, + &dev_attr_nwid.attr, + &dev_attr_crypt.attr, + &dev_attr_fragment.attr, + &dev_attr_retries.attr, + &dev_attr_misc.attr, + &dev_attr_beacon.attr, + NULL +}; + +static struct attribute_group wireless_group = { + .name = "wireless", + .attrs = wireless_attrs, +}; +#endif +#endif /* CONFIG_SYSFS */ + +#ifdef CONFIG_RPS +/* + * RX queue sysfs structures and functions. + */ +struct rx_queue_attribute { + struct attribute attr; + ssize_t (*show)(struct netdev_rx_queue *queue, + struct rx_queue_attribute *attr, char *buf); + ssize_t (*store)(struct netdev_rx_queue *queue, + struct rx_queue_attribute *attr, const char *buf, size_t len); +}; +#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, +}; + +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; + size_t len = 0; + int i; + + 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 += cpumask_scnprintf(buf + len, PAGE_SIZE, mask); + if (PAGE_SIZE - len < 3) { + rcu_read_unlock(); + free_cpumask_var(mask); + return -EINVAL; + } + rcu_read_unlock(); + + free_cpumask_var(mask); + len += sprintf(buf + len, "\n"); + return len; +} + +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, + 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 (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, + struct rx_queue_attribute *attr, + char *buf) +{ + struct rps_dev_flow_table *flow_table; + unsigned int val = 0; + + rcu_read_lock(); + flow_table = rcu_dereference(queue->rps_flow_table); + if (flow_table) + val = flow_table->mask + 1; + rcu_read_unlock(); + + return sprintf(buf, "%u\n", val); +} + +static void rps_dev_flow_table_release_work(struct work_struct *work) +{ + struct rps_dev_flow_table *table = container_of(work, + struct rps_dev_flow_table, free_work); + + vfree(table); +} + +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); + + INIT_WORK(&table->free_work, rps_dev_flow_table_release_work); + schedule_work(&table->free_work); +} + +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 int count; + char *endp; + struct rps_dev_flow_table *table, *old_table; + static DEFINE_SPINLOCK(rps_dev_flow_lock); + + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + + count = simple_strtoul(buf, &endp, 0); + if (endp == buf) + return -EINVAL; + + if (count) { + int i; + + if (count > 1<<30) { + /* Enforce a limit to prevent overflow */ + return -EINVAL; + } + count = roundup_pow_of_two(count); + table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count)); + if (!table) + return -ENOMEM; + + table->mask = count - 1; + for (i = 0; i < count; i++) + table->flows[i].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); + +static struct attribute *rx_queue_default_attrs[] = { + &rps_cpus_attribute.attr, + &rps_dev_flow_table_cnt_attribute.attr, + NULL +}; + +static void rx_queue_release(struct kobject *kobj) +{ + struct netdev_rx_queue *queue = to_rx_queue(kobj); + struct rps_map *map; + struct rps_dev_flow_table *flow_table; + + + map = rcu_dereference_raw(queue->rps_map); + if (map) { + RCU_INIT_POINTER(queue->rps_map, NULL); + kfree_rcu(map, rcu); + } + + flow_table = rcu_dereference_raw(queue->rps_flow_table); + if (flow_table) { + RCU_INIT_POINTER(queue->rps_flow_table, NULL); + call_rcu(&flow_table->rcu, rps_dev_flow_table_release); + } + + memset(kobj, 0, sizeof(*kobj)); + dev_put(queue->dev); +} + +static struct kobj_type rx_queue_ktype = { + .sysfs_ops = &rx_queue_sysfs_ops, + .release = rx_queue_release, + .default_attrs = rx_queue_default_attrs, +}; + +static int rx_queue_add_kobject(struct net_device *net, int index) +{ + struct netdev_rx_queue *queue = net->_rx + index; + struct kobject *kobj = &queue->kobj; + int error = 0; + + kobj->kset = net->queues_kset; + error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, + "rx-%u", index); + if (error) { + kobject_put(kobj); + return error; + } + + kobject_uevent(kobj, KOBJ_ADD); + dev_hold(queue->dev); + + return error; +} +#endif /* CONFIG_RPS */ + +int +net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num) +{ +#ifdef CONFIG_RPS + int i; + int error = 0; + + for (i = old_num; i < new_num; i++) { + error = rx_queue_add_kobject(net, i); + if (error) { + new_num = old_num; + break; + } + } + + while (--i >= new_num) + kobject_put(&net->_rx[i].kobj); + + return error; +#else + return 0; +#endif +} + +#ifdef CONFIG_XPS +/* + * 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 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_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; + size_t len = 0; + int i; + + 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 += cpumask_scnprintf(buf + len, PAGE_SIZE, mask); + if (PAGE_SIZE - len < 3) { + free_cpumask_var(mask); + return -EINVAL; + } + + free_cpumask_var(mask); + len += sprintf(buf + len, "\n"); + return len; +} + +static DEFINE_MUTEX(xps_map_mutex); +#define xmap_dereference(P) \ + rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) + +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; + cpumask_var_t mask; + int err, i, cpu, pos, map_len, alloc_len, need_set; + unsigned long index; + struct xps_map *map, *new_map; + struct xps_dev_maps *dev_maps, *new_dev_maps; + int nonempty = 0; + int numa_node = -2; + + 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; + } + + new_dev_maps = kzalloc(max_t(unsigned, + XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL); + if (!new_dev_maps) { + free_cpumask_var(mask); + return -ENOMEM; + } + + mutex_lock(&xps_map_mutex); + + dev_maps = xmap_dereference(dev->xps_maps); + + for_each_possible_cpu(cpu) { + map = dev_maps ? + xmap_dereference(dev_maps->cpu_map[cpu]) : NULL; + new_map = map; + if (map) { + for (pos = 0; pos < map->len; pos++) + if (map->queues[pos] == index) + break; + map_len = map->len; + alloc_len = map->alloc_len; + } else + pos = map_len = alloc_len = 0; + + need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu); +#ifdef CONFIG_NUMA + if (need_set) { + if (numa_node == -2) + numa_node = cpu_to_node(cpu); + else if (numa_node != cpu_to_node(cpu)) + numa_node = -1; + } +#endif + if (need_set && pos >= map_len) { + /* Need to add queue to this CPU's map */ + if (map_len >= alloc_len) { + alloc_len = alloc_len ? + 2 * alloc_len : XPS_MIN_MAP_ALLOC; + new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), + GFP_KERNEL, + cpu_to_node(cpu)); + if (!new_map) + goto error; + new_map->alloc_len = alloc_len; + for (i = 0; i < map_len; i++) + new_map->queues[i] = map->queues[i]; + new_map->len = map_len; + } + new_map->queues[new_map->len++] = index; + } else if (!need_set && pos < map_len) { + /* Need to remove queue from this CPU's map */ + if (map_len > 1) + new_map->queues[pos] = + new_map->queues[--new_map->len]; + else + new_map = NULL; + } + RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map); + } + + /* Cleanup old maps */ + for_each_possible_cpu(cpu) { + map = dev_maps ? + xmap_dereference(dev_maps->cpu_map[cpu]) : NULL; + if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map) + kfree_rcu(map, rcu); + if (new_dev_maps->cpu_map[cpu]) + nonempty = 1; + } + + if (nonempty) + rcu_assign_pointer(dev->xps_maps, new_dev_maps); + else { + kfree(new_dev_maps); + rcu_assign_pointer(dev->xps_maps, NULL); + } + + if (dev_maps) + kfree_rcu(dev_maps, rcu); + + netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node : + NUMA_NO_NODE); + + mutex_unlock(&xps_map_mutex); + + free_cpumask_var(mask); + return len; + +error: + mutex_unlock(&xps_map_mutex); + + if (new_dev_maps) + for_each_possible_cpu(i) + kfree(rcu_dereference_protected( + new_dev_maps->cpu_map[i], + 1)); + kfree(new_dev_maps); + free_cpumask_var(mask); + return -ENOMEM; +} + +static struct netdev_queue_attribute xps_cpus_attribute = + __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map); + +static struct attribute *netdev_queue_default_attrs[] = { + &xps_cpus_attribute.attr, + NULL +}; + +static void netdev_queue_release(struct kobject *kobj) +{ + struct netdev_queue *queue = to_netdev_queue(kobj); + struct net_device *dev = queue->dev; + struct xps_dev_maps *dev_maps; + struct xps_map *map; + unsigned long index; + int i, pos, nonempty = 0; + + index = get_netdev_queue_index(queue); + + mutex_lock(&xps_map_mutex); + dev_maps = xmap_dereference(dev->xps_maps); + + if (dev_maps) { + for_each_possible_cpu(i) { + map = xmap_dereference(dev_maps->cpu_map[i]); + if (!map) + continue; + + for (pos = 0; pos < map->len; pos++) + if (map->queues[pos] == index) + break; + + if (pos < map->len) { + if (map->len > 1) + map->queues[pos] = + map->queues[--map->len]; + else { + RCU_INIT_POINTER(dev_maps->cpu_map[i], + NULL); + kfree_rcu(map, rcu); + map = NULL; + } + } + if (map) + nonempty = 1; + } + + if (!nonempty) { + RCU_INIT_POINTER(dev->xps_maps, NULL); + kfree_rcu(dev_maps, rcu); + } + } + + mutex_unlock(&xps_map_mutex); + + memset(kobj, 0, sizeof(*kobj)); + dev_put(queue->dev); +} + +static struct kobj_type netdev_queue_ktype = { + .sysfs_ops = &netdev_queue_sysfs_ops, + .release = netdev_queue_release, + .default_attrs = netdev_queue_default_attrs, +}; + +static int netdev_queue_add_kobject(struct net_device *net, int index) +{ + struct netdev_queue *queue = net->_tx + index; + struct kobject *kobj = &queue->kobj; + int error = 0; + + kobj->kset = net->queues_kset; + error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, + "tx-%u", index); + if (error) { + kobject_put(kobj); + return error; + } + + kobject_uevent(kobj, KOBJ_ADD); + dev_hold(queue->dev); + + return error; +} +#endif /* CONFIG_XPS */ + +int +netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num) +{ +#ifdef CONFIG_XPS + int i; + int error = 0; + + for (i = old_num; i < new_num; i++) { + error = netdev_queue_add_kobject(net, i); + if (error) { + new_num = old_num; + break; + } + } + + while (--i >= new_num) + kobject_put(&net->_tx[i].kobj); + + return error; +#else + return 0; +#endif +} + +static int register_queue_kobjects(struct net_device *net) +{ + int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; + +#if defined(CONFIG_RPS) || defined(CONFIG_XPS) + net->queues_kset = kset_create_and_add("queues", + NULL, &net->dev.kobj); + if (!net->queues_kset) + return -ENOMEM; +#endif + +#ifdef CONFIG_RPS + real_rx = net->real_num_rx_queues; +#endif + real_tx = net->real_num_tx_queues; + + error = net_rx_queue_update_kobjects(net, 0, real_rx); + if (error) + goto error; + rxq = real_rx; + + error = netdev_queue_update_kobjects(net, 0, real_tx); + if (error) + goto error; + txq = real_tx; + + return 0; + +error: + netdev_queue_update_kobjects(net, txq, 0); + net_rx_queue_update_kobjects(net, rxq, 0); + return error; +} + +static void remove_queue_kobjects(struct net_device *net) +{ + int real_rx = 0, real_tx = 0; + +#ifdef CONFIG_RPS + real_rx = net->real_num_rx_queues; +#endif + real_tx = net->real_num_tx_queues; + + net_rx_queue_update_kobjects(net, real_rx, 0); + netdev_queue_update_kobjects(net, real_tx, 0); +#if defined(CONFIG_RPS) || defined(CONFIG_XPS) + kset_unregister(net->queues_kset); +#endif +} + +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, + .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); + +#ifdef CONFIG_HOTPLUG +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; +} +#endif + +/* + * 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); + kfree((char *)dev - dev->padded); +} + +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, +#ifdef CONFIG_SYSFS + .dev_attrs = net_class_attributes, +#endif /* CONFIG_SYSFS */ +#ifdef CONFIG_HOTPLUG + .dev_uevent = netdev_uevent, +#endif + .ns_type = &net_ns_type_operations, + .namespace = net_namespace, +}; + +/* Delete sysfs entries but hold kobject reference until after all + * netdev references are gone. + */ +void netdev_unregister_kobject(struct net_device * net) +{ + struct device *dev = &(net->dev); + + kobject_get(&dev->kobj); + + remove_queue_kobjects(net); + + device_del(dev); +} + +/* Create sysfs entries for network device. */ +int netdev_register_kobject(struct net_device *net) +{ + struct device *dev = &(net->dev); + const struct attribute_group **groups = net->sysfs_groups; + int error = 0; + + device_initialize(dev); + dev->class = &net_class; + dev->platform_data = net; + dev->groups = groups; + + dev_set_name(dev, "%s", net->name); + +#ifdef CONFIG_SYSFS + /* Allow for a device specific group */ + if (*groups) + groups++; + + *groups++ = &netstat_group; +#ifdef CONFIG_WIRELESS_EXT_SYSFS + if (net->ieee80211_ptr) + *groups++ = &wireless_group; +#ifdef CONFIG_WIRELESS_EXT + else if (net->wireless_handlers) + *groups++ = &wireless_group; +#endif +#endif +#endif /* CONFIG_SYSFS */ + + error = device_add(dev); + if (error) + return error; + + error = register_queue_kobjects(net); + if (error) { + device_del(dev); + return error; + } + + return error; +} + +int netdev_class_create_file(struct class_attribute *class_attr) +{ + return class_create_file(&net_class, class_attr); +} +EXPORT_SYMBOL(netdev_class_create_file); + +void netdev_class_remove_file(struct class_attribute *class_attr) +{ + class_remove_file(&net_class, class_attr); +} +EXPORT_SYMBOL(netdev_class_remove_file); + +int netdev_kobject_init(void) +{ + kobj_ns_type_register(&net_ns_type_operations); + return class_register(&net_class); +} |