net/core/net-sysfs.c

   1 /*
   2  * net-sysfs.c - network device class and attributes
   3  *
   4  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/capability.h>
  13 #include <linux/kernel.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/slab.h>
  17 #include <linux/nsproxy.h>
  18 #include <net/sock.h>
  19 #include <net/net_namespace.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/wireless.h>
  22 #include <linux/vmalloc.h>
  23 #include <net/wext.h>
  24
  25 #include "net-sysfs.h"
  26
  27 #ifdef CONFIG_SYSFS
  28 static const char fmt_hex[] = "%#x\n";
  29 static const char fmt_long_hex[] = "%#lx\n";
  30 static const char fmt_dec[] = "%d\n";
  31 static const char fmt_ulong[] = "%lu\n";
  32 static const char fmt_u64[] = "%llu\n";
  33
  34 static inline int dev_isalive(const struct net_device *dev)
  35 {
  36         return dev->reg_state <= NETREG_REGISTERED;
  37 }
  38
  39 /* use same locking rules as GIF* ioctl's */
  40 static ssize_t netdev_show(const struct device *dev,
  41                            struct device_attribute *attr, char *buf,
  42                            ssize_t (*format)(const struct net_device *, char *))
  43 {
  44         struct net_device *net = to_net_dev(dev);
  45         ssize_t ret = -EINVAL;
  46
  47         read_lock(&dev_base_lock);
  48         if (dev_isalive(net))
  49                 ret = (*format)(net, buf);
  50         read_unlock(&dev_base_lock);
  51
  52         return ret;
  53 }
  54
  55 /* generate a show function for simple field */
  56 #define NETDEVICE_SHOW(field, format_string)                            \
  57 static ssize_t format_##field(const struct net_device *net, char *buf)  \
  58 {                                                                       \
  59         return sprintf(buf, format_string, net->field);                 \
  60 }                                                                       \
  61 static ssize_t show_##field(struct device *dev,                         \
  62                             struct device_attribute *attr, char *buf)   \
  63 {                                                                       \
  64         return netdev_show(dev, attr, buf, format_##field);             \
  65 }
  66
  67
  68 /* use same locking and permission rules as SIF* ioctl's */
  69 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  70                             const char *buf, size_t len,
  71                             int (*set)(struct net_device *, unsigned long))
  72 {
  73         struct net_device *net = to_net_dev(dev);
  74         char *endp;
  75         unsigned long new;
  76         int ret = -EINVAL;
  77
  78         if (!capable(CAP_NET_ADMIN))
  79                 return -EPERM;
  80
  81         new = simple_strtoul(buf, &endp, 0);
  82         if (endp == buf)
  83                 goto err;
  84
  85         if (!rtnl_trylock())
  86                 return restart_syscall();
  87
  88         if (dev_isalive(net)) {
  89                 if ((ret = (*set)(net, new)) == 0)
  90                         ret = len;
  91         }
  92         rtnl_unlock();
  93  err:
  94         return ret;
  95 }
  96
  97 NETDEVICE_SHOW(dev_id, fmt_hex);
  98 NETDEVICE_SHOW(addr_assign_type, fmt_dec);
  99 NETDEVICE_SHOW(addr_len, fmt_dec);
 100 NETDEVICE_SHOW(iflink, fmt_dec);
 101 NETDEVICE_SHOW(ifindex, fmt_dec);
 102 NETDEVICE_SHOW(features, fmt_hex);
 103 NETDEVICE_SHOW(type, fmt_dec);
 104 NETDEVICE_SHOW(link_mode, fmt_dec);
 105
 106 /* use same locking rules as GIFHWADDR ioctl's */
 107 static ssize_t show_address(struct device *dev, struct device_attribute *attr,
 108                             char *buf)
 109 {
 110         struct net_device *net = to_net_dev(dev);
 111         ssize_t ret = -EINVAL;
 112
 113         read_lock(&dev_base_lock);
 114         if (dev_isalive(net))
 115                 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
 116         read_unlock(&dev_base_lock);
 117         return ret;
 118 }
 119
 120 static ssize_t show_broadcast(struct device *dev,
 121                             struct device_attribute *attr, char *buf)
 122 {
 123         struct net_device *net = to_net_dev(dev);
 124         if (dev_isalive(net))
 125                 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
 126         return -EINVAL;
 127 }
 128
 129 static ssize_t show_carrier(struct device *dev,
 130                             struct device_attribute *attr, char *buf)
 131 {
 132         struct net_device *netdev = to_net_dev(dev);
 133         if (netif_running(netdev)) {
 134                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 135         }
 136         return -EINVAL;
 137 }
 138
 139 static ssize_t show_speed(struct device *dev,
 140                           struct device_attribute *attr, char *buf)
 141 {
 142         struct net_device *netdev = to_net_dev(dev);
 143         int ret = -EINVAL;
 144
 145         if (!rtnl_trylock())
 146                 return restart_syscall();
 147
 148         if (netif_running(netdev) &&
 149             netdev->ethtool_ops &&
 150             netdev->ethtool_ops->get_settings) {
 151                 struct ethtool_cmd cmd = { ETHTOOL_GSET };
 152
 153                 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
 154                         ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd));
 155         }
 156         rtnl_unlock();
 157         return ret;
 158 }
 159
 160 static ssize_t show_duplex(struct device *dev,
 161                            struct device_attribute *attr, char *buf)
 162 {
 163         struct net_device *netdev = to_net_dev(dev);
 164         int ret = -EINVAL;
 165
 166         if (!rtnl_trylock())
 167                 return restart_syscall();
 168
 169         if (netif_running(netdev) &&
 170             netdev->ethtool_ops &&
 171             netdev->ethtool_ops->get_settings) {
 172                 struct ethtool_cmd cmd = { ETHTOOL_GSET };
 173
 174                 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
 175                         ret = sprintf(buf, "%s\n", cmd.duplex ? "full" : "half");
 176         }
 177         rtnl_unlock();
 178         return ret;
 179 }
 180
 181 static ssize_t show_dormant(struct device *dev,
 182                             struct device_attribute *attr, char *buf)
 183 {
 184         struct net_device *netdev = to_net_dev(dev);
 185
 186         if (netif_running(netdev))
 187                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 188
 189         return -EINVAL;
 190 }
 191
 192 static const char *const operstates[] = {
 193         "unknown",
 194         "notpresent", /* currently unused */
 195         "down",
 196         "lowerlayerdown",
 197         "testing", /* currently unused */
 198         "dormant",
 199         "up"
 200 };
 201
 202 static ssize_t show_operstate(struct device *dev,
 203                               struct device_attribute *attr, char *buf)
 204 {
 205         const struct net_device *netdev = to_net_dev(dev);
 206         unsigned char operstate;
 207
 208         read_lock(&dev_base_lock);
 209         operstate = netdev->operstate;
 210         if (!netif_running(netdev))
 211                 operstate = IF_OPER_DOWN;
 212         read_unlock(&dev_base_lock);
 213
 214         if (operstate >= ARRAY_SIZE(operstates))
 215                 return -EINVAL; /* should not happen */
 216
 217         return sprintf(buf, "%s\n", operstates[operstate]);
 218 }
 219
 220 /* read-write attributes */
 221 NETDEVICE_SHOW(mtu, fmt_dec);
 222
 223 static int change_mtu(struct net_device *net, unsigned long new_mtu)
 224 {
 225         return dev_set_mtu(net, (int) new_mtu);
 226 }
 227
 228 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
 229                          const char *buf, size_t len)
 230 {
 231         return netdev_store(dev, attr, buf, len, change_mtu);
 232 }
 233
 234 NETDEVICE_SHOW(flags, fmt_hex);
 235
 236 static int change_flags(struct net_device *net, unsigned long new_flags)
 237 {
 238         return dev_change_flags(net, (unsigned) new_flags);
 239 }
 240
 241 static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
 242                            const char *buf, size_t len)
 243 {
 244         return netdev_store(dev, attr, buf, len, change_flags);
 245 }
 246
 247 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
 248
 249 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
 250 {
 251         net->tx_queue_len = new_len;
 252         return 0;
 253 }
 254
 255 static ssize_t store_tx_queue_len(struct device *dev,
 256                                   struct device_attribute *attr,
 257                                   const char *buf, size_t len)
 258 {
 259         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
 260 }
 261
 262 static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
 263                              const char *buf, size_t len)
 264 {
 265         struct net_device *netdev = to_net_dev(dev);
 266         size_t count = len;
 267         ssize_t ret;
 268
 269         if (!capable(CAP_NET_ADMIN))
 270                 return -EPERM;
 271
 272         /* ignore trailing newline */
 273         if (len >  0 && buf[len - 1] == '\n')
 274                 --count;
 275
 276         if (!rtnl_trylock())
 277                 return restart_syscall();
 278         ret = dev_set_alias(netdev, buf, count);
 279         rtnl_unlock();
 280
 281         return ret < 0 ? ret : len;
 282 }
 283
 284 static ssize_t show_ifalias(struct device *dev,
 285                             struct device_attribute *attr, char *buf)
 286 {
 287         const struct net_device *netdev = to_net_dev(dev);
 288         ssize_t ret = 0;
 289
 290         if (!rtnl_trylock())
 291                 return restart_syscall();
 292         if (netdev->ifalias)
 293                 ret = sprintf(buf, "%s\n", netdev->ifalias);
 294         rtnl_unlock();
 295         return ret;
 296 }
 297
 298 NETDEVICE_SHOW(group, fmt_dec);
 299
 300 static int change_group(struct net_device *net, unsigned long new_group)
 301 {
 302         dev_set_group(net, (int) new_group);
 303         return 0;
 304 }
 305
 306 static ssize_t store_group(struct device *dev, struct device_attribute *attr,
 307                          const char *buf, size_t len)
 308 {
 309         return netdev_store(dev, attr, buf, len, change_group);
 310 }
 311
 312 static struct device_attribute net_class_attributes[] = {
 313         __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
 314         __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
 315         __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
 316         __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
 317         __ATTR(iflink, S_IRUGO, show_iflink, NULL),
 318         __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
 319         __ATTR(features, S_IRUGO, show_features, NULL),
 320         __ATTR(type, S_IRUGO, show_type, NULL),
 321         __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
 322         __ATTR(address, S_IRUGO, show_address, NULL),
 323         __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
 324         __ATTR(carrier, S_IRUGO, show_carrier, NULL),
 325         __ATTR(speed, S_IRUGO, show_speed, NULL),
 326         __ATTR(duplex, S_IRUGO, show_duplex, NULL),
 327         __ATTR(dormant, S_IRUGO, show_dormant, NULL),
 328         __ATTR(operstate, S_IRUGO, show_operstate, NULL),
 329         __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
 330         __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
 331         __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
 332                store_tx_queue_len),
 333         __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
 334         {}
 335 };
 336
 337 /* Show a given an attribute in the statistics group */
 338 static ssize_t netstat_show(const struct device *d,
 339                             struct device_attribute *attr, char *buf,
 340                             unsigned long offset)
 341 {
 342         struct net_device *dev = to_net_dev(d);
 343         ssize_t ret = -EINVAL;
 344
 345         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 346                         offset % sizeof(u64) != 0);
 347
 348         read_lock(&dev_base_lock);
 349         if (dev_isalive(dev)) {
 350                 struct rtnl_link_stats64 temp;
 351                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 352
 353                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
 354         }
 355         read_unlock(&dev_base_lock);
 356         return ret;
 357 }
 358
 359 /* generate a read-only statistics attribute */
 360 #define NETSTAT_ENTRY(name)                                             \
 361 static ssize_t show_##name(struct device *d,                            \
 362                            struct device_attribute *attr, char *buf)    \
 363 {                                                                       \
 364         return netstat_show(d, attr, buf,                               \
 365                             offsetof(struct rtnl_link_stats64, name));  \
 366 }                                                                       \
 367 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
 368
 369 NETSTAT_ENTRY(rx_packets);
 370 NETSTAT_ENTRY(tx_packets);
 371 NETSTAT_ENTRY(rx_bytes);
 372 NETSTAT_ENTRY(tx_bytes);
 373 NETSTAT_ENTRY(rx_errors);
 374 NETSTAT_ENTRY(tx_errors);
 375 NETSTAT_ENTRY(rx_dropped);
 376 NETSTAT_ENTRY(tx_dropped);
 377 NETSTAT_ENTRY(multicast);
 378 NETSTAT_ENTRY(collisions);
 379 NETSTAT_ENTRY(rx_length_errors);
 380 NETSTAT_ENTRY(rx_over_errors);
 381 NETSTAT_ENTRY(rx_crc_errors);
 382 NETSTAT_ENTRY(rx_frame_errors);
 383 NETSTAT_ENTRY(rx_fifo_errors);
 384 NETSTAT_ENTRY(rx_missed_errors);
 385 NETSTAT_ENTRY(tx_aborted_errors);
 386 NETSTAT_ENTRY(tx_carrier_errors);
 387 NETSTAT_ENTRY(tx_fifo_errors);
 388 NETSTAT_ENTRY(tx_heartbeat_errors);
 389 NETSTAT_ENTRY(tx_window_errors);
 390 NETSTAT_ENTRY(rx_compressed);
 391 NETSTAT_ENTRY(tx_compressed);
 392
 393 static struct attribute *netstat_attrs[] = {
 394         &dev_attr_rx_packets.attr,
 395         &dev_attr_tx_packets.attr,
 396         &dev_attr_rx_bytes.attr,
 397         &dev_attr_tx_bytes.attr,
 398         &dev_attr_rx_errors.attr,
 399         &dev_attr_tx_errors.attr,
 400         &dev_attr_rx_dropped.attr,
 401         &dev_attr_tx_dropped.attr,
 402         &dev_attr_multicast.attr,
 403         &dev_attr_collisions.attr,
 404         &dev_attr_rx_length_errors.attr,
 405         &dev_attr_rx_over_errors.attr,
 406         &dev_attr_rx_crc_errors.attr,
 407         &dev_attr_rx_frame_errors.attr,
 408         &dev_attr_rx_fifo_errors.attr,
 409         &dev_attr_rx_missed_errors.attr,
 410         &dev_attr_tx_aborted_errors.attr,
 411         &dev_attr_tx_carrier_errors.attr,
 412         &dev_attr_tx_fifo_errors.attr,
 413         &dev_attr_tx_heartbeat_errors.attr,
 414         &dev_attr_tx_window_errors.attr,
 415         &dev_attr_rx_compressed.attr,
 416         &dev_attr_tx_compressed.attr,
 417         NULL
 418 };
 419
 420
 421 static struct attribute_group netstat_group = {
 422         .name  = "statistics",
 423         .attrs  = netstat_attrs,
 424 };
 425
 426 #ifdef CONFIG_WIRELESS_EXT_SYSFS
 427 /* helper function that does all the locking etc for wireless stats */
 428 static ssize_t wireless_show(struct device *d, char *buf,
 429                              ssize_t (*format)(const struct iw_statistics *,
 430                                                char *))
 431 {
 432         struct net_device *dev = to_net_dev(d);
 433         const struct iw_statistics *iw;
 434         ssize_t ret = -EINVAL;
 435
 436         if (!rtnl_trylock())
 437                 return restart_syscall();
 438         if (dev_isalive(dev)) {
 439                 iw = get_wireless_stats(dev);
 440                 if (iw)
 441                         ret = (*format)(iw, buf);
 442         }
 443         rtnl_unlock();
 444
 445         return ret;
 446 }
 447
 448 /* show function template for wireless fields */
 449 #define WIRELESS_SHOW(name, field, format_string)                       \
 450 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
 451 {                                                                       \
 452         return sprintf(buf, format_string, iw->field);                  \
 453 }                                                                       \
 454 static ssize_t show_iw_##name(struct device *d,                         \
 455                               struct device_attribute *attr, char *buf) \
 456 {                                                                       \
 457         return wireless_show(d, buf, format_iw_##name);                 \
 458 }                                                                       \
 459 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
 460
 461 WIRELESS_SHOW(status, status, fmt_hex);
 462 WIRELESS_SHOW(link, qual.qual, fmt_dec);
 463 WIRELESS_SHOW(level, qual.level, fmt_dec);
 464 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
 465 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
 466 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
 467 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
 468 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
 469 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
 470 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
 471
 472 static struct attribute *wireless_attrs[] = {
 473         &dev_attr_status.attr,
 474         &dev_attr_link.attr,
 475         &dev_attr_level.attr,
 476         &dev_attr_noise.attr,
 477         &dev_attr_nwid.attr,
 478         &dev_attr_crypt.attr,
 479         &dev_attr_fragment.attr,
 480         &dev_attr_retries.attr,
 481         &dev_attr_misc.attr,
 482         &dev_attr_beacon.attr,
 483         NULL
 484 };
 485
 486 static struct attribute_group wireless_group = {
 487         .name = "wireless",
 488         .attrs = wireless_attrs,
 489 };
 490 #endif
 491 #endif /* CONFIG_SYSFS */
 492
 493 #ifdef CONFIG_RPS
 494 /*
 495  * RX queue sysfs structures and functions.
 496  */
 497 struct rx_queue_attribute {
 498         struct attribute attr;
 499         ssize_t (*show)(struct netdev_rx_queue *queue,
 500             struct rx_queue_attribute *attr, char *buf);
 501         ssize_t (*store)(struct netdev_rx_queue *queue,
 502             struct rx_queue_attribute *attr, const char *buf, size_t len);
 503 };
 504 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 505     struct rx_queue_attribute, attr)
 506
 507 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 508
 509 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 510                                   char *buf)
 511 {
 512         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 513         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 514
 515         if (!attribute->show)
 516                 return -EIO;
 517
 518         return attribute->show(queue, attribute, buf);
 519 }
 520
 521 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 522                                    const char *buf, size_t count)
 523 {
 524         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 525         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 526
 527         if (!attribute->store)
 528                 return -EIO;
 529
 530         return attribute->store(queue, attribute, buf, count);
 531 }
 532
 533 static const struct sysfs_ops rx_queue_sysfs_ops = {
 534         .show = rx_queue_attr_show,
 535         .store = rx_queue_attr_store,
 536 };
 537
 538 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 539                             struct rx_queue_attribute *attribute, char *buf)
 540 {
 541         struct rps_map *map;
 542         cpumask_var_t mask;
 543         size_t len = 0;
 544         int i;
 545
 546         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 547                 return -ENOMEM;
 548
 549         rcu_read_lock();
 550         map = rcu_dereference(queue->rps_map);
 551         if (map)
 552                 for (i = 0; i < map->len; i++)
 553                         cpumask_set_cpu(map->cpus[i], mask);
 554
 555         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 556         if (PAGE_SIZE - len < 3) {
 557                 rcu_read_unlock();
 558                 free_cpumask_var(mask);
 559                 return -EINVAL;
 560         }
 561         rcu_read_unlock();
 562
 563         free_cpumask_var(mask);
 564         len += sprintf(buf + len, "\n");
 565         return len;
 566 }
 567
 568 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 569                       struct rx_queue_attribute *attribute,
 570                       const char *buf, size_t len)
 571 {
 572         struct rps_map *old_map, *map;
 573         cpumask_var_t mask;
 574         int err, cpu, i;
 575         static DEFINE_SPINLOCK(rps_map_lock);
 576
 577         if (!capable(CAP_NET_ADMIN))
 578                 return -EPERM;
 579
 580         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 581                 return -ENOMEM;
 582
 583         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 584         if (err) {
 585                 free_cpumask_var(mask);
 586                 return err;
 587         }
 588
 589         map = kzalloc(max_t(unsigned,
 590             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 591             GFP_KERNEL);
 592         if (!map) {
 593                 free_cpumask_var(mask);
 594                 return -ENOMEM;
 595         }
 596
 597         i = 0;
 598         for_each_cpu_and(cpu, mask, cpu_online_mask)
 599                 map->cpus[i++] = cpu;
 600
 601         if (i)
 602                 map->len = i;
 603         else {
 604                 kfree(map);
 605                 map = NULL;
 606         }
 607
 608         spin_lock(&rps_map_lock);
 609         old_map = rcu_dereference_protected(queue->rps_map,
 610                                             lockdep_is_held(&rps_map_lock));
 611         rcu_assign_pointer(queue->rps_map, map);
 612         spin_unlock(&rps_map_lock);
 613
 614         if (old_map)
 615                 kfree_rcu(old_map, rcu);
 616
 617         free_cpumask_var(mask);
 618         return len;
 619 }
 620
 621 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 622                                            struct rx_queue_attribute *attr,
 623                                            char *buf)
 624 {
 625         struct rps_dev_flow_table *flow_table;
 626         unsigned int val = 0;
 627
 628         rcu_read_lock();
 629         flow_table = rcu_dereference(queue->rps_flow_table);
 630         if (flow_table)
 631                 val = flow_table->mask + 1;
 632         rcu_read_unlock();
 633
 634         return sprintf(buf, "%u\n", val);
 635 }
 636
 637 static void rps_dev_flow_table_release_work(struct work_struct *work)
 638 {
 639         struct rps_dev_flow_table *table = container_of(work,
 640             struct rps_dev_flow_table, free_work);
 641
 642         vfree(table);
 643 }
 644
 645 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 646 {
 647         struct rps_dev_flow_table *table = container_of(rcu,
 648             struct rps_dev_flow_table, rcu);
 649
 650         INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
 651         schedule_work(&table->free_work);
 652 }
 653
 654 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 655                                      struct rx_queue_attribute *attr,
 656                                      const char *buf, size_t len)
 657 {
 658         unsigned int count;
 659         char *endp;
 660         struct rps_dev_flow_table *table, *old_table;
 661         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 662
 663         if (!capable(CAP_NET_ADMIN))
 664                 return -EPERM;
 665
 666         count = simple_strtoul(buf, &endp, 0);
 667         if (endp == buf)
 668                 return -EINVAL;
 669
 670         if (count) {
 671                 int i;
 672
 673                 if (count > 1<<30) {
 674                         /* Enforce a limit to prevent overflow */
 675                         return -EINVAL;
 676                 }
 677                 count = roundup_pow_of_two(count);
 678                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
 679                 if (!table)
 680                         return -ENOMEM;
 681
 682                 table->mask = count - 1;
 683                 for (i = 0; i < count; i++)
 684                         table->flows[i].cpu = RPS_NO_CPU;
 685         } else
 686                 table = NULL;
 687
 688         spin_lock(&rps_dev_flow_lock);
 689         old_table = rcu_dereference_protected(queue->rps_flow_table,
 690                                               lockdep_is_held(&rps_dev_flow_lock));
 691         rcu_assign_pointer(queue->rps_flow_table, table);
 692         spin_unlock(&rps_dev_flow_lock);
 693
 694         if (old_table)
 695                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 696
 697         return len;
 698 }
 699
 700 static struct rx_queue_attribute rps_cpus_attribute =
 701         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 702
 703
 704 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 705         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 706             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 707
 708 static struct attribute *rx_queue_default_attrs[] = {
 709         &rps_cpus_attribute.attr,
 710         &rps_dev_flow_table_cnt_attribute.attr,
 711         NULL
 712 };
 713
 714 static void rx_queue_release(struct kobject *kobj)
 715 {
 716         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 717         struct rps_map *map;
 718         struct rps_dev_flow_table *flow_table;
 719
 720
 721         map = rcu_dereference_raw(queue->rps_map);
 722         if (map) {
 723                 RCU_INIT_POINTER(queue->rps_map, NULL);
 724                 kfree_rcu(map, rcu);
 725         }
 726
 727         flow_table = rcu_dereference_raw(queue->rps_flow_table);
 728         if (flow_table) {
 729                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 730                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 731         }
 732
 733         memset(kobj, 0, sizeof(*kobj));
 734         dev_put(queue->dev);
 735 }
 736
 737 static struct kobj_type rx_queue_ktype = {
 738         .sysfs_ops = &rx_queue_sysfs_ops,
 739         .release = rx_queue_release,
 740         .default_attrs = rx_queue_default_attrs,
 741 };
 742
 743 static int rx_queue_add_kobject(struct net_device *net, int index)
 744 {
 745         struct netdev_rx_queue *queue = net->_rx + index;
 746         struct kobject *kobj = &queue->kobj;
 747         int error = 0;
 748
 749         kobj->kset = net->queues_kset;
 750         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 751             "rx-%u", index);
 752         if (error) {
 753                 kobject_put(kobj);
 754                 return error;
 755         }
 756
 757         kobject_uevent(kobj, KOBJ_ADD);
 758         dev_hold(queue->dev);
 759
 760         return error;
 761 }
 762 #endif /* CONFIG_RPS */
 763
 764 int
 765 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
 766 {
 767 #ifdef CONFIG_RPS
 768         int i;
 769         int error = 0;
 770
 771         for (i = old_num; i < new_num; i++) {
 772                 error = rx_queue_add_kobject(net, i);
 773                 if (error) {
 774                         new_num = old_num;
 775                         break;
 776                 }
 777         }
 778
 779         while (--i >= new_num)
 780                 kobject_put(&net->_rx[i].kobj);
 781
 782         return error;
 783 #else
 784         return 0;
 785 #endif
 786 }
 787
 788 #ifdef CONFIG_XPS
 789 /*
 790  * netdev_queue sysfs structures and functions.
 791  */
 792 struct netdev_queue_attribute {
 793         struct attribute attr;
 794         ssize_t (*show)(struct netdev_queue *queue,
 795             struct netdev_queue_attribute *attr, char *buf);
 796         ssize_t (*store)(struct netdev_queue *queue,
 797             struct netdev_queue_attribute *attr, const char *buf, size_t len);
 798 };
 799 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
 800     struct netdev_queue_attribute, attr)
 801
 802 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 803
 804 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 805                                       struct attribute *attr, char *buf)
 806 {
 807         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 808         struct netdev_queue *queue = to_netdev_queue(kobj);
 809
 810         if (!attribute->show)
 811                 return -EIO;
 812
 813         return attribute->show(queue, attribute, buf);
 814 }
 815
 816 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 817                                        struct attribute *attr,
 818                                        const char *buf, size_t count)
 819 {
 820         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 821         struct netdev_queue *queue = to_netdev_queue(kobj);
 822
 823         if (!attribute->store)
 824                 return -EIO;
 825
 826         return attribute->store(queue, attribute, buf, count);
 827 }
 828
 829 static const struct sysfs_ops netdev_queue_sysfs_ops = {
 830         .show = netdev_queue_attr_show,
 831         .store = netdev_queue_attr_store,
 832 };
 833
 834 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
 835 {
 836         struct net_device *dev = queue->dev;
 837         int i;
 838
 839         for (i = 0; i < dev->num_tx_queues; i++)
 840                 if (queue == &dev->_tx[i])
 841                         break;
 842
 843         BUG_ON(i >= dev->num_tx_queues);
 844
 845         return i;
 846 }
 847
 848
 849 static ssize_t show_xps_map(struct netdev_queue *queue,
 850                             struct netdev_queue_attribute *attribute, char *buf)
 851 {
 852         struct net_device *dev = queue->dev;
 853         struct xps_dev_maps *dev_maps;
 854         cpumask_var_t mask;
 855         unsigned long index;
 856         size_t len = 0;
 857         int i;
 858
 859         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 860                 return -ENOMEM;
 861
 862         index = get_netdev_queue_index(queue);
 863
 864         rcu_read_lock();
 865         dev_maps = rcu_dereference(dev->xps_maps);
 866         if (dev_maps) {
 867                 for_each_possible_cpu(i) {
 868                         struct xps_map *map =
 869                             rcu_dereference(dev_maps->cpu_map[i]);
 870                         if (map) {
 871                                 int j;
 872                                 for (j = 0; j < map->len; j++) {
 873                                         if (map->queues[j] == index) {
 874                                                 cpumask_set_cpu(i, mask);
 875                                                 break;
 876                                         }
 877                                 }
 878                         }
 879                 }
 880         }
 881         rcu_read_unlock();
 882
 883         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 884         if (PAGE_SIZE - len < 3) {
 885                 free_cpumask_var(mask);
 886                 return -EINVAL;
 887         }
 888
 889         free_cpumask_var(mask);
 890         len += sprintf(buf + len, "\n");
 891         return len;
 892 }
 893
 894 static DEFINE_MUTEX(xps_map_mutex);
 895 #define xmap_dereference(P)             \
 896         rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
 897
 898 static ssize_t store_xps_map(struct netdev_queue *queue,
 899                       struct netdev_queue_attribute *attribute,
 900                       const char *buf, size_t len)
 901 {
 902         struct net_device *dev = queue->dev;
 903         cpumask_var_t mask;
 904         int err, i, cpu, pos, map_len, alloc_len, need_set;
 905         unsigned long index;
 906         struct xps_map *map, *new_map;
 907         struct xps_dev_maps *dev_maps, *new_dev_maps;
 908         int nonempty = 0;
 909         int numa_node = -2;
 910
 911         if (!capable(CAP_NET_ADMIN))
 912                 return -EPERM;
 913
 914         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 915                 return -ENOMEM;
 916
 917         index = get_netdev_queue_index(queue);
 918
 919         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 920         if (err) {
 921                 free_cpumask_var(mask);
 922                 return err;
 923         }
 924
 925         new_dev_maps = kzalloc(max_t(unsigned,
 926             XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
 927         if (!new_dev_maps) {
 928                 free_cpumask_var(mask);
 929                 return -ENOMEM;
 930         }
 931
 932         mutex_lock(&xps_map_mutex);
 933
 934         dev_maps = xmap_dereference(dev->xps_maps);
 935
 936         for_each_possible_cpu(cpu) {
 937                 map = dev_maps ?
 938                         xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
 939                 new_map = map;
 940                 if (map) {
 941                         for (pos = 0; pos < map->len; pos++)
 942                                 if (map->queues[pos] == index)
 943                                         break;
 944                         map_len = map->len;
 945                         alloc_len = map->alloc_len;
 946                 } else
 947                         pos = map_len = alloc_len = 0;
 948
 949                 need_set = cpu_isset(cpu, *mask) && cpu_online(cpu);
 950 #ifdef CONFIG_NUMA
 951                 if (need_set) {
 952                         if (numa_node == -2)
 953                                 numa_node = cpu_to_node(cpu);
 954                         else if (numa_node != cpu_to_node(cpu))
 955                                 numa_node = -1;
 956                 }
 957 #endif
 958                 if (need_set && pos >= map_len) {
 959                         /* Need to add queue to this CPU's map */
 960                         if (map_len >= alloc_len) {
 961                                 alloc_len = alloc_len ?
 962                                     2 * alloc_len : XPS_MIN_MAP_ALLOC;
 963                                 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
 964                                                        GFP_KERNEL,
 965                                                        cpu_to_node(cpu));
 966                                 if (!new_map)
 967                                         goto error;
 968                                 new_map->alloc_len = alloc_len;
 969                                 for (i = 0; i < map_len; i++)
 970                                         new_map->queues[i] = map->queues[i];
 971                                 new_map->len = map_len;
 972                         }
 973                         new_map->queues[new_map->len++] = index;
 974                 } else if (!need_set && pos < map_len) {
 975                         /* Need to remove queue from this CPU's map */
 976                         if (map_len > 1)
 977                                 new_map->queues[pos] =
 978                                     new_map->queues[--new_map->len];
 979                         else
 980                                 new_map = NULL;
 981                 }
 982                 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
 983         }
 984
 985         /* Cleanup old maps */
 986         for_each_possible_cpu(cpu) {
 987                 map = dev_maps ?
 988                         xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
 989                 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
 990                         kfree_rcu(map, rcu);
 991                 if (new_dev_maps->cpu_map[cpu])
 992                         nonempty = 1;
 993         }
 994
 995         if (nonempty)
 996                 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
 997         else {
 998                 kfree(new_dev_maps);
 999                 rcu_assign_pointer(dev->xps_maps, NULL);
1000         }
1001
1002         if (dev_maps)
1003                 kfree_rcu(dev_maps, rcu);
1004
1005         netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node :
1006                                             NUMA_NO_NODE);
1007
1008         mutex_unlock(&xps_map_mutex);
1009
1010         free_cpumask_var(mask);
1011         return len;
1012
1013 error:
1014         mutex_unlock(&xps_map_mutex);
1015
1016         if (new_dev_maps)
1017                 for_each_possible_cpu(i)
1018                         kfree(rcu_dereference_protected(
1019                                 new_dev_maps->cpu_map[i],
1020                                 1));
1021         kfree(new_dev_maps);
1022         free_cpumask_var(mask);
1023         return -ENOMEM;
1024 }
1025
1026 static struct netdev_queue_attribute xps_cpus_attribute =
1027     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1028
1029 static struct attribute *netdev_queue_default_attrs[] = {
1030         &xps_cpus_attribute.attr,
1031         NULL
1032 };
1033
1034 static void netdev_queue_release(struct kobject *kobj)
1035 {
1036         struct netdev_queue *queue = to_netdev_queue(kobj);
1037         struct net_device *dev = queue->dev;
1038         struct xps_dev_maps *dev_maps;
1039         struct xps_map *map;
1040         unsigned long index;
1041         int i, pos, nonempty = 0;
1042
1043         index = get_netdev_queue_index(queue);
1044
1045         mutex_lock(&xps_map_mutex);
1046         dev_maps = xmap_dereference(dev->xps_maps);
1047
1048         if (dev_maps) {
1049                 for_each_possible_cpu(i) {
1050                         map = xmap_dereference(dev_maps->cpu_map[i]);
1051                         if (!map)
1052                                 continue;
1053
1054                         for (pos = 0; pos < map->len; pos++)
1055                                 if (map->queues[pos] == index)
1056                                         break;
1057
1058                         if (pos < map->len) {
1059                                 if (map->len > 1)
1060                                         map->queues[pos] =
1061                                             map->queues[--map->len];
1062                                 else {
1063                                         RCU_INIT_POINTER(dev_maps->cpu_map[i],
1064                                             NULL);
1065                                         kfree_rcu(map, rcu);
1066                                         map = NULL;
1067                                 }
1068                         }
1069                         if (map)
1070                                 nonempty = 1;
1071                 }
1072
1073                 if (!nonempty) {
1074                         RCU_INIT_POINTER(dev->xps_maps, NULL);
1075                         kfree_rcu(dev_maps, rcu);
1076                 }
1077         }
1078
1079         mutex_unlock(&xps_map_mutex);
1080
1081         memset(kobj, 0, sizeof(*kobj));
1082         dev_put(queue->dev);
1083 }
1084
1085 static struct kobj_type netdev_queue_ktype = {
1086         .sysfs_ops = &netdev_queue_sysfs_ops,
1087         .release = netdev_queue_release,
1088         .default_attrs = netdev_queue_default_attrs,
1089 };
1090
1091 static int netdev_queue_add_kobject(struct net_device *net, int index)
1092 {
1093         struct netdev_queue *queue = net->_tx + index;
1094         struct kobject *kobj = &queue->kobj;
1095         int error = 0;
1096
1097         kobj->kset = net->queues_kset;
1098         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1099             "tx-%u", index);
1100         if (error) {
1101                 kobject_put(kobj);
1102                 return error;
1103         }
1104
1105         kobject_uevent(kobj, KOBJ_ADD);
1106         dev_hold(queue->dev);
1107
1108         return error;
1109 }
1110 #endif /* CONFIG_XPS */
1111
1112 int
1113 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1114 {
1115 #ifdef CONFIG_XPS
1116         int i;
1117         int error = 0;
1118
1119         for (i = old_num; i < new_num; i++) {
1120                 error = netdev_queue_add_kobject(net, i);
1121                 if (error) {
1122                         new_num = old_num;
1123                         break;
1124                 }
1125         }
1126
1127         while (--i >= new_num)
1128                 kobject_put(&net->_tx[i].kobj);
1129
1130         return error;
1131 #else
1132         return 0;
1133 #endif
1134 }
1135
1136 static int register_queue_kobjects(struct net_device *net)
1137 {
1138         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1139
1140 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1141         net->queues_kset = kset_create_and_add("queues",
1142             NULL, &net->dev.kobj);
1143         if (!net->queues_kset)
1144                 return -ENOMEM;
1145 #endif
1146
1147 #ifdef CONFIG_RPS
1148         real_rx = net->real_num_rx_queues;
1149 #endif
1150         real_tx = net->real_num_tx_queues;
1151
1152         error = net_rx_queue_update_kobjects(net, 0, real_rx);
1153         if (error)
1154                 goto error;
1155         rxq = real_rx;
1156
1157         error = netdev_queue_update_kobjects(net, 0, real_tx);
1158         if (error)
1159                 goto error;
1160         txq = real_tx;
1161
1162         return 0;
1163
1164 error:
1165         netdev_queue_update_kobjects(net, txq, 0);
1166         net_rx_queue_update_kobjects(net, rxq, 0);
1167         return error;
1168 }
1169
1170 static void remove_queue_kobjects(struct net_device *net)
1171 {
1172         int real_rx = 0, real_tx = 0;
1173
1174 #ifdef CONFIG_RPS
1175         real_rx = net->real_num_rx_queues;
1176 #endif
1177         real_tx = net->real_num_tx_queues;
1178
1179         net_rx_queue_update_kobjects(net, real_rx, 0);
1180         netdev_queue_update_kobjects(net, real_tx, 0);
1181 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1182         kset_unregister(net->queues_kset);
1183 #endif
1184 }
1185
1186 static const void *net_current_ns(void)
1187 {
1188         return current->nsproxy->net_ns;
1189 }
1190
1191 static const void *net_initial_ns(void)
1192 {
1193         return &init_net;
1194 }
1195
1196 static const void *net_netlink_ns(struct sock *sk)
1197 {
1198         return sock_net(sk);
1199 }
1200
1201 struct kobj_ns_type_operations net_ns_type_operations = {
1202         .type = KOBJ_NS_TYPE_NET,
1203         .current_ns = net_current_ns,
1204         .netlink_ns = net_netlink_ns,
1205         .initial_ns = net_initial_ns,
1206 };
1207 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1208
1209 static void net_kobj_ns_exit(struct net *net)
1210 {
1211         kobj_ns_exit(KOBJ_NS_TYPE_NET, net);
1212 }
1213
1214 static struct pernet_operations kobj_net_ops = {
1215         .exit = net_kobj_ns_exit,
1216 };
1217
1218
1219 #ifdef CONFIG_HOTPLUG
1220 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1221 {
1222         struct net_device *dev = to_net_dev(d);
1223         int retval;
1224
1225         /* pass interface to uevent. */
1226         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1227         if (retval)
1228                 goto exit;
1229
1230         /* pass ifindex to uevent.
1231          * ifindex is useful as it won't change (interface name may change)
1232          * and is what RtNetlink uses natively. */
1233         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1234
1235 exit:
1236         return retval;
1237 }
1238 #endif
1239
1240 /*
1241  *      netdev_release -- destroy and free a dead device.
1242  *      Called when last reference to device kobject is gone.
1243  */
1244 static void netdev_release(struct device *d)
1245 {
1246         struct net_device *dev = to_net_dev(d);
1247
1248         BUG_ON(dev->reg_state != NETREG_RELEASED);
1249
1250         kfree(dev->ifalias);
1251         kfree((char *)dev - dev->padded);
1252 }
1253
1254 static const void *net_namespace(struct device *d)
1255 {
1256         struct net_device *dev;
1257         dev = container_of(d, struct net_device, dev);
1258         return dev_net(dev);
1259 }
1260
1261 static struct class net_class = {
1262         .name = "net",
1263         .dev_release = netdev_release,
1264 #ifdef CONFIG_SYSFS
1265         .dev_attrs = net_class_attributes,
1266 #endif /* CONFIG_SYSFS */
1267 #ifdef CONFIG_HOTPLUG
1268         .dev_uevent = netdev_uevent,
1269 #endif
1270         .ns_type = &net_ns_type_operations,
1271         .namespace = net_namespace,
1272 };
1273
1274 /* Delete sysfs entries but hold kobject reference until after all
1275  * netdev references are gone.
1276  */
1277 void netdev_unregister_kobject(struct net_device * net)
1278 {
1279         struct device *dev = &(net->dev);
1280
1281         kobject_get(&dev->kobj);
1282
1283         remove_queue_kobjects(net);
1284
1285         device_del(dev);
1286 }
1287
1288 /* Create sysfs entries for network device. */
1289 int netdev_register_kobject(struct net_device *net)
1290 {
1291         struct device *dev = &(net->dev);
1292         const struct attribute_group **groups = net->sysfs_groups;
1293         int error = 0;
1294
1295         device_initialize(dev);
1296         dev->class = &net_class;
1297         dev->platform_data = net;
1298         dev->groups = groups;
1299
1300         dev_set_name(dev, "%s", net->name);
1301
1302 #ifdef CONFIG_SYSFS
1303         /* Allow for a device specific group */
1304         if (*groups)
1305                 groups++;
1306
1307         *groups++ = &netstat_group;
1308 #ifdef CONFIG_WIRELESS_EXT_SYSFS
1309         if (net->ieee80211_ptr)
1310                 *groups++ = &wireless_group;
1311 #ifdef CONFIG_WIRELESS_EXT
1312         else if (net->wireless_handlers)
1313                 *groups++ = &wireless_group;
1314 #endif
1315 #endif
1316 #endif /* CONFIG_SYSFS */
1317
1318         error = device_add(dev);
1319         if (error)
1320                 return error;
1321
1322         error = register_queue_kobjects(net);
1323         if (error) {
1324                 device_del(dev);
1325                 return error;
1326         }
1327
1328         return error;
1329 }
1330
1331 int netdev_class_create_file(struct class_attribute *class_attr)
1332 {
1333         return class_create_file(&net_class, class_attr);
1334 }
1335 EXPORT_SYMBOL(netdev_class_create_file);
1336
1337 void netdev_class_remove_file(struct class_attribute *class_attr)
1338 {
1339         class_remove_file(&net_class, class_attr);
1340 }
1341 EXPORT_SYMBOL(netdev_class_remove_file);
1342
1343 int netdev_kobject_init(void)
1344 {
1345         kobj_ns_type_register(&net_ns_type_operations);
1346         register_pernet_subsys(&kobj_net_ops);
1347         return class_register(&net_class);
1348 }