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 void rps_map_release(struct rcu_head *rcu)
 569 {
 570         struct rps_map *map = container_of(rcu, struct rps_map, rcu);
 571
 572         kfree(map);
 573 }
 574
 575 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 576                       struct rx_queue_attribute *attribute,
 577                       const char *buf, size_t len)
 578 {
 579         struct rps_map *old_map, *map;
 580         cpumask_var_t mask;
 581         int err, cpu, i;
 582         static DEFINE_SPINLOCK(rps_map_lock);
 583
 584         if (!capable(CAP_NET_ADMIN))
 585                 return -EPERM;
 586
 587         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 588                 return -ENOMEM;
 589
 590         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 591         if (err) {
 592                 free_cpumask_var(mask);
 593                 return err;
 594         }
 595
 596         map = kzalloc(max_t(unsigned,
 597             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 598             GFP_KERNEL);
 599         if (!map) {
 600                 free_cpumask_var(mask);
 601                 return -ENOMEM;
 602         }
 603
 604         i = 0;
 605         for_each_cpu_and(cpu, mask, cpu_online_mask)
 606                 map->cpus[i++] = cpu;
 607
 608         if (i)
 609                 map->len = i;
 610         else {
 611                 kfree(map);
 612                 map = NULL;
 613         }
 614
 615         spin_lock(&rps_map_lock);
 616         old_map = rcu_dereference_protected(queue->rps_map,
 617                                             lockdep_is_held(&rps_map_lock));
 618         rcu_assign_pointer(queue->rps_map, map);
 619         spin_unlock(&rps_map_lock);
 620
 621         if (old_map)
 622                 call_rcu(&old_map->rcu, rps_map_release);
 623
 624         free_cpumask_var(mask);
 625         return len;
 626 }
 627
 628 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 629                                            struct rx_queue_attribute *attr,
 630                                            char *buf)
 631 {
 632         struct rps_dev_flow_table *flow_table;
 633         unsigned int val = 0;
 634
 635         rcu_read_lock();
 636         flow_table = rcu_dereference(queue->rps_flow_table);
 637         if (flow_table)
 638                 val = flow_table->mask + 1;
 639         rcu_read_unlock();
 640
 641         return sprintf(buf, "%u\n", val);
 642 }
 643
 644 static void rps_dev_flow_table_release_work(struct work_struct *work)
 645 {
 646         struct rps_dev_flow_table *table = container_of(work,
 647             struct rps_dev_flow_table, free_work);
 648
 649         vfree(table);
 650 }
 651
 652 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 653 {
 654         struct rps_dev_flow_table *table = container_of(rcu,
 655             struct rps_dev_flow_table, rcu);
 656
 657         INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
 658         schedule_work(&table->free_work);
 659 }
 660
 661 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 662                                      struct rx_queue_attribute *attr,
 663                                      const char *buf, size_t len)
 664 {
 665         unsigned int count;
 666         char *endp;
 667         struct rps_dev_flow_table *table, *old_table;
 668         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 669
 670         if (!capable(CAP_NET_ADMIN))
 671                 return -EPERM;
 672
 673         count = simple_strtoul(buf, &endp, 0);
 674         if (endp == buf)
 675                 return -EINVAL;
 676
 677         if (count) {
 678                 int i;
 679
 680                 if (count > 1<<30) {
 681                         /* Enforce a limit to prevent overflow */
 682                         return -EINVAL;
 683                 }
 684                 count = roundup_pow_of_two(count);
 685                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
 686                 if (!table)
 687                         return -ENOMEM;
 688
 689                 table->mask = count - 1;
 690                 for (i = 0; i < count; i++)
 691                         table->flows[i].cpu = RPS_NO_CPU;
 692         } else
 693                 table = NULL;
 694
 695         spin_lock(&rps_dev_flow_lock);
 696         old_table = rcu_dereference_protected(queue->rps_flow_table,
 697                                               lockdep_is_held(&rps_dev_flow_lock));
 698         rcu_assign_pointer(queue->rps_flow_table, table);
 699         spin_unlock(&rps_dev_flow_lock);
 700
 701         if (old_table)
 702                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 703
 704         return len;
 705 }
 706
 707 static struct rx_queue_attribute rps_cpus_attribute =
 708         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 709
 710
 711 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 712         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 713             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 714
 715 static struct attribute *rx_queue_default_attrs[] = {
 716         &rps_cpus_attribute.attr,
 717         &rps_dev_flow_table_cnt_attribute.attr,
 718         NULL
 719 };
 720
 721 static void rx_queue_release(struct kobject *kobj)
 722 {
 723         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 724         struct rps_map *map;
 725         struct rps_dev_flow_table *flow_table;
 726
 727
 728         map = rcu_dereference_raw(queue->rps_map);
 729         if (map) {
 730                 RCU_INIT_POINTER(queue->rps_map, NULL);
 731                 call_rcu(&map->rcu, rps_map_release);
 732         }
 733
 734         flow_table = rcu_dereference_raw(queue->rps_flow_table);
 735         if (flow_table) {
 736                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 737                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 738         }
 739
 740         memset(kobj, 0, sizeof(*kobj));
 741         dev_put(queue->dev);
 742 }
 743
 744 static struct kobj_type rx_queue_ktype = {
 745         .sysfs_ops = &rx_queue_sysfs_ops,
 746         .release = rx_queue_release,
 747         .default_attrs = rx_queue_default_attrs,
 748 };
 749
 750 static int rx_queue_add_kobject(struct net_device *net, int index)
 751 {
 752         struct netdev_rx_queue *queue = net->_rx + index;
 753         struct kobject *kobj = &queue->kobj;
 754         int error = 0;
 755
 756         kobj->kset = net->queues_kset;
 757         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 758             "rx-%u", index);
 759         if (error) {
 760                 kobject_put(kobj);
 761                 return error;
 762         }
 763
 764         kobject_uevent(kobj, KOBJ_ADD);
 765         dev_hold(queue->dev);
 766
 767         return error;
 768 }
 769 #endif /* CONFIG_RPS */
 770
 771 int
 772 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
 773 {
 774 #ifdef CONFIG_RPS
 775         int i;
 776         int error = 0;
 777
 778         for (i = old_num; i < new_num; i++) {
 779                 error = rx_queue_add_kobject(net, i);
 780                 if (error) {
 781                         new_num = old_num;
 782                         break;
 783                 }
 784         }
 785
 786         while (--i >= new_num)
 787                 kobject_put(&net->_rx[i].kobj);
 788
 789         return error;
 790 #else
 791         return 0;
 792 #endif
 793 }
 794
 795 #ifdef CONFIG_XPS
 796 /*
 797  * netdev_queue sysfs structures and functions.
 798  */
 799 struct netdev_queue_attribute {
 800         struct attribute attr;
 801         ssize_t (*show)(struct netdev_queue *queue,
 802             struct netdev_queue_attribute *attr, char *buf);
 803         ssize_t (*store)(struct netdev_queue *queue,
 804             struct netdev_queue_attribute *attr, const char *buf, size_t len);
 805 };
 806 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
 807     struct netdev_queue_attribute, attr)
 808
 809 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 810
 811 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 812                                       struct attribute *attr, char *buf)
 813 {
 814         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 815         struct netdev_queue *queue = to_netdev_queue(kobj);
 816
 817         if (!attribute->show)
 818                 return -EIO;
 819
 820         return attribute->show(queue, attribute, buf);
 821 }
 822
 823 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 824                                        struct attribute *attr,
 825                                        const char *buf, size_t count)
 826 {
 827         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 828         struct netdev_queue *queue = to_netdev_queue(kobj);
 829
 830         if (!attribute->store)
 831                 return -EIO;
 832
 833         return attribute->store(queue, attribute, buf, count);
 834 }
 835
 836 static const struct sysfs_ops netdev_queue_sysfs_ops = {
 837         .show = netdev_queue_attr_show,
 838         .store = netdev_queue_attr_store,
 839 };
 840
 841 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
 842 {
 843         struct net_device *dev = queue->dev;
 844         int i;
 845
 846         for (i = 0; i < dev->num_tx_queues; i++)
 847                 if (queue == &dev->_tx[i])
 848                         break;
 849
 850         BUG_ON(i >= dev->num_tx_queues);
 851
 852         return i;
 853 }
 854
 855
 856 static ssize_t show_xps_map(struct netdev_queue *queue,
 857                             struct netdev_queue_attribute *attribute, char *buf)
 858 {
 859         struct net_device *dev = queue->dev;
 860         struct xps_dev_maps *dev_maps;
 861         cpumask_var_t mask;
 862         unsigned long index;
 863         size_t len = 0;
 864         int i;
 865
 866         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 867                 return -ENOMEM;
 868
 869         index = get_netdev_queue_index(queue);
 870
 871         rcu_read_lock();
 872         dev_maps = rcu_dereference(dev->xps_maps);
 873         if (dev_maps) {
 874                 for_each_possible_cpu(i) {
 875                         struct xps_map *map =
 876                             rcu_dereference(dev_maps->cpu_map[i]);
 877                         if (map) {
 878                                 int j;
 879                                 for (j = 0; j < map->len; j++) {
 880                                         if (map->queues[j] == index) {
 881                                                 cpumask_set_cpu(i, mask);
 882                                                 break;
 883                                         }
 884                                 }
 885                         }
 886                 }
 887         }
 888         rcu_read_unlock();
 889
 890         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 891         if (PAGE_SIZE - len < 3) {
 892                 free_cpumask_var(mask);
 893                 return -EINVAL;
 894         }
 895
 896         free_cpumask_var(mask);
 897         len += sprintf(buf + len, "\n");
 898         return len;
 899 }
 900
 901 static void xps_map_release(struct rcu_head *rcu)
 902 {
 903         struct xps_map *map = container_of(rcu, struct xps_map, rcu);
 904
 905         kfree(map);
 906 }
 907
 908 static void xps_dev_maps_release(struct rcu_head *rcu)
 909 {
 910         struct xps_dev_maps *dev_maps =
 911             container_of(rcu, struct xps_dev_maps, rcu);
 912
 913         kfree(dev_maps);
 914 }
 915
 916 static DEFINE_MUTEX(xps_map_mutex);
 917 #define xmap_dereference(P)             \
 918         rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
 919
 920 static ssize_t store_xps_map(struct netdev_queue *queue,
 921                       struct netdev_queue_attribute *attribute,
 922                       const char *buf, size_t len)
 923 {
 924         struct net_device *dev = queue->dev;
 925         cpumask_var_t mask;
 926         int err, i, cpu, pos, map_len, alloc_len, need_set;
 927         unsigned long index;
 928         struct xps_map *map, *new_map;
 929         struct xps_dev_maps *dev_maps, *new_dev_maps;
 930         int nonempty = 0;
 931         int numa_node = -2;
 932
 933         if (!capable(CAP_NET_ADMIN))
 934                 return -EPERM;
 935
 936         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 937                 return -ENOMEM;
 938
 939         index = get_netdev_queue_index(queue);
 940
 941         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 942         if (err) {
 943                 free_cpumask_var(mask);
 944                 return err;
 945         }
 946
 947         new_dev_maps = kzalloc(max_t(unsigned,
 948             XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
 949         if (!new_dev_maps) {
 950                 free_cpumask_var(mask);
 951                 return -ENOMEM;
 952         }
 953
 954         mutex_lock(&xps_map_mutex);
 955
 956         dev_maps = xmap_dereference(dev->xps_maps);
 957
 958         for_each_possible_cpu(cpu) {
 959                 map = dev_maps ?
 960                         xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
 961                 new_map = map;
 962                 if (map) {
 963                         for (pos = 0; pos < map->len; pos++)
 964                                 if (map->queues[pos] == index)
 965                                         break;
 966                         map_len = map->len;
 967                         alloc_len = map->alloc_len;
 968                 } else
 969                         pos = map_len = alloc_len = 0;
 970
 971                 need_set = cpu_isset(cpu, *mask) && cpu_online(cpu);
 972 #ifdef CONFIG_NUMA
 973                 if (need_set) {
 974                         if (numa_node == -2)
 975                                 numa_node = cpu_to_node(cpu);
 976                         else if (numa_node != cpu_to_node(cpu))
 977                                 numa_node = -1;
 978                 }
 979 #endif
 980                 if (need_set && pos >= map_len) {
 981                         /* Need to add queue to this CPU's map */
 982                         if (map_len >= alloc_len) {
 983                                 alloc_len = alloc_len ?
 984                                     2 * alloc_len : XPS_MIN_MAP_ALLOC;
 985                                 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
 986                                                        GFP_KERNEL,
 987                                                        cpu_to_node(cpu));
 988                                 if (!new_map)
 989                                         goto error;
 990                                 new_map->alloc_len = alloc_len;
 991                                 for (i = 0; i < map_len; i++)
 992                                         new_map->queues[i] = map->queues[i];
 993                                 new_map->len = map_len;
 994                         }
 995                         new_map->queues[new_map->len++] = index;
 996                 } else if (!need_set && pos < map_len) {
 997                         /* Need to remove queue from this CPU's map */
 998                         if (map_len > 1)
 999                                 new_map->queues[pos] =
1000                                     new_map->queues[--new_map->len];
1001                         else
1002                                 new_map = NULL;
1003                 }
1004                 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
1005         }
1006
1007         /* Cleanup old maps */
1008         for_each_possible_cpu(cpu) {
1009                 map = dev_maps ?
1010                         xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
1011                 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
1012                         call_rcu(&map->rcu, xps_map_release);
1013                 if (new_dev_maps->cpu_map[cpu])
1014                         nonempty = 1;
1015         }
1016
1017         if (nonempty)
1018                 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
1019         else {
1020                 kfree(new_dev_maps);
1021                 rcu_assign_pointer(dev->xps_maps, NULL);
1022         }
1023
1024         if (dev_maps)
1025                 call_rcu(&dev_maps->rcu, xps_dev_maps_release);
1026
1027         netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node :
1028                                             NUMA_NO_NODE);
1029
1030         mutex_unlock(&xps_map_mutex);
1031
1032         free_cpumask_var(mask);
1033         return len;
1034
1035 error:
1036         mutex_unlock(&xps_map_mutex);
1037
1038         if (new_dev_maps)
1039                 for_each_possible_cpu(i)
1040                         kfree(rcu_dereference_protected(
1041                                 new_dev_maps->cpu_map[i],
1042                                 1));
1043         kfree(new_dev_maps);
1044         free_cpumask_var(mask);
1045         return -ENOMEM;
1046 }
1047
1048 static struct netdev_queue_attribute xps_cpus_attribute =
1049     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1050
1051 static struct attribute *netdev_queue_default_attrs[] = {
1052         &xps_cpus_attribute.attr,
1053         NULL
1054 };
1055
1056 static void netdev_queue_release(struct kobject *kobj)
1057 {
1058         struct netdev_queue *queue = to_netdev_queue(kobj);
1059         struct net_device *dev = queue->dev;
1060         struct xps_dev_maps *dev_maps;
1061         struct xps_map *map;
1062         unsigned long index;
1063         int i, pos, nonempty = 0;
1064
1065         index = get_netdev_queue_index(queue);
1066
1067         mutex_lock(&xps_map_mutex);
1068         dev_maps = xmap_dereference(dev->xps_maps);
1069
1070         if (dev_maps) {
1071                 for_each_possible_cpu(i) {
1072                         map = xmap_dereference(dev_maps->cpu_map[i]);
1073                         if (!map)
1074                                 continue;
1075
1076                         for (pos = 0; pos < map->len; pos++)
1077                                 if (map->queues[pos] == index)
1078                                         break;
1079
1080                         if (pos < map->len) {
1081                                 if (map->len > 1)
1082                                         map->queues[pos] =
1083                                             map->queues[--map->len];
1084                                 else {
1085                                         RCU_INIT_POINTER(dev_maps->cpu_map[i],
1086                                             NULL);
1087                                         call_rcu(&map->rcu, xps_map_release);
1088                                         map = NULL;
1089                                 }
1090                         }
1091                         if (map)
1092                                 nonempty = 1;
1093                 }
1094
1095                 if (!nonempty) {
1096                         RCU_INIT_POINTER(dev->xps_maps, NULL);
1097                         call_rcu(&dev_maps->rcu, xps_dev_maps_release);
1098                 }
1099         }
1100
1101         mutex_unlock(&xps_map_mutex);
1102
1103         memset(kobj, 0, sizeof(*kobj));
1104         dev_put(queue->dev);
1105 }
1106
1107 static struct kobj_type netdev_queue_ktype = {
1108         .sysfs_ops = &netdev_queue_sysfs_ops,
1109         .release = netdev_queue_release,
1110         .default_attrs = netdev_queue_default_attrs,
1111 };
1112
1113 static int netdev_queue_add_kobject(struct net_device *net, int index)
1114 {
1115         struct netdev_queue *queue = net->_tx + index;
1116         struct kobject *kobj = &queue->kobj;
1117         int error = 0;
1118
1119         kobj->kset = net->queues_kset;
1120         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1121             "tx-%u", index);
1122         if (error) {
1123                 kobject_put(kobj);
1124                 return error;
1125         }
1126
1127         kobject_uevent(kobj, KOBJ_ADD);
1128         dev_hold(queue->dev);
1129
1130         return error;
1131 }
1132 #endif /* CONFIG_XPS */
1133
1134 int
1135 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1136 {
1137 #ifdef CONFIG_XPS
1138         int i;
1139         int error = 0;
1140
1141         for (i = old_num; i < new_num; i++) {
1142                 error = netdev_queue_add_kobject(net, i);
1143                 if (error) {
1144                         new_num = old_num;
1145                         break;
1146                 }
1147         }
1148
1149         while (--i >= new_num)
1150                 kobject_put(&net->_tx[i].kobj);
1151
1152         return error;
1153 #else
1154         return 0;
1155 #endif
1156 }
1157
1158 static int register_queue_kobjects(struct net_device *net)
1159 {
1160         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1161
1162 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1163         net->queues_kset = kset_create_and_add("queues",
1164             NULL, &net->dev.kobj);
1165         if (!net->queues_kset)
1166                 return -ENOMEM;
1167 #endif
1168
1169 #ifdef CONFIG_RPS
1170         real_rx = net->real_num_rx_queues;
1171 #endif
1172         real_tx = net->real_num_tx_queues;
1173
1174         error = net_rx_queue_update_kobjects(net, 0, real_rx);
1175         if (error)
1176                 goto error;
1177         rxq = real_rx;
1178
1179         error = netdev_queue_update_kobjects(net, 0, real_tx);
1180         if (error)
1181                 goto error;
1182         txq = real_tx;
1183
1184         return 0;
1185
1186 error:
1187         netdev_queue_update_kobjects(net, txq, 0);
1188         net_rx_queue_update_kobjects(net, rxq, 0);
1189         return error;
1190 }
1191
1192 static void remove_queue_kobjects(struct net_device *net)
1193 {
1194         int real_rx = 0, real_tx = 0;
1195
1196 #ifdef CONFIG_RPS
1197         real_rx = net->real_num_rx_queues;
1198 #endif
1199         real_tx = net->real_num_tx_queues;
1200
1201         net_rx_queue_update_kobjects(net, real_rx, 0);
1202         netdev_queue_update_kobjects(net, real_tx, 0);
1203 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1204         kset_unregister(net->queues_kset);
1205 #endif
1206 }
1207
1208 static const void *net_current_ns(void)
1209 {
1210         return current->nsproxy->net_ns;
1211 }
1212
1213 static const void *net_initial_ns(void)
1214 {
1215         return &init_net;
1216 }
1217
1218 static const void *net_netlink_ns(struct sock *sk)
1219 {
1220         return sock_net(sk);
1221 }
1222
1223 struct kobj_ns_type_operations net_ns_type_operations = {
1224         .type = KOBJ_NS_TYPE_NET,
1225         .current_ns = net_current_ns,
1226         .netlink_ns = net_netlink_ns,
1227         .initial_ns = net_initial_ns,
1228 };
1229 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1230
1231 static void net_kobj_ns_exit(struct net *net)
1232 {
1233         kobj_ns_exit(KOBJ_NS_TYPE_NET, net);
1234 }
1235
1236 static struct pernet_operations kobj_net_ops = {
1237         .exit = net_kobj_ns_exit,
1238 };
1239
1240
1241 #ifdef CONFIG_HOTPLUG
1242 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1243 {
1244         struct net_device *dev = to_net_dev(d);
1245         int retval;
1246
1247         /* pass interface to uevent. */
1248         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1249         if (retval)
1250                 goto exit;
1251
1252         /* pass ifindex to uevent.
1253          * ifindex is useful as it won't change (interface name may change)
1254          * and is what RtNetlink uses natively. */
1255         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1256
1257 exit:
1258         return retval;
1259 }
1260 #endif
1261
1262 /*
1263  *      netdev_release -- destroy and free a dead device.
1264  *      Called when last reference to device kobject is gone.
1265  */
1266 static void netdev_release(struct device *d)
1267 {
1268         struct net_device *dev = to_net_dev(d);
1269
1270         BUG_ON(dev->reg_state != NETREG_RELEASED);
1271
1272         kfree(dev->ifalias);
1273         kfree((char *)dev - dev->padded);
1274 }
1275
1276 static const void *net_namespace(struct device *d)
1277 {
1278         struct net_device *dev;
1279         dev = container_of(d, struct net_device, dev);
1280         return dev_net(dev);
1281 }
1282
1283 static struct class net_class = {
1284         .name = "net",
1285         .dev_release = netdev_release,
1286 #ifdef CONFIG_SYSFS
1287         .dev_attrs = net_class_attributes,
1288 #endif /* CONFIG_SYSFS */
1289 #ifdef CONFIG_HOTPLUG
1290         .dev_uevent = netdev_uevent,
1291 #endif
1292         .ns_type = &net_ns_type_operations,
1293         .namespace = net_namespace,
1294 };
1295
1296 /* Delete sysfs entries but hold kobject reference until after all
1297  * netdev references are gone.
1298  */
1299 void netdev_unregister_kobject(struct net_device * net)
1300 {
1301         struct device *dev = &(net->dev);
1302
1303         kobject_get(&dev->kobj);
1304
1305         remove_queue_kobjects(net);
1306
1307         device_del(dev);
1308 }
1309
1310 /* Create sysfs entries for network device. */
1311 int netdev_register_kobject(struct net_device *net)
1312 {
1313         struct device *dev = &(net->dev);
1314         const struct attribute_group **groups = net->sysfs_groups;
1315         int error = 0;
1316
1317         device_initialize(dev);
1318         dev->class = &net_class;
1319         dev->platform_data = net;
1320         dev->groups = groups;
1321
1322         dev_set_name(dev, "%s", net->name);
1323
1324 #ifdef CONFIG_SYSFS
1325         /* Allow for a device specific group */
1326         if (*groups)
1327                 groups++;
1328
1329         *groups++ = &netstat_group;
1330 #ifdef CONFIG_WIRELESS_EXT_SYSFS
1331         if (net->ieee80211_ptr)
1332                 *groups++ = &wireless_group;
1333 #ifdef CONFIG_WIRELESS_EXT
1334         else if (net->wireless_handlers)
1335                 *groups++ = &wireless_group;
1336 #endif
1337 #endif
1338 #endif /* CONFIG_SYSFS */
1339
1340         error = device_add(dev);
1341         if (error)
1342                 return error;
1343
1344         error = register_queue_kobjects(net);
1345         if (error) {
1346                 device_del(dev);
1347                 return error;
1348         }
1349
1350         return error;
1351 }
1352
1353 int netdev_class_create_file(struct class_attribute *class_attr)
1354 {
1355         return class_create_file(&net_class, class_attr);
1356 }
1357 EXPORT_SYMBOL(netdev_class_create_file);
1358
1359 void netdev_class_remove_file(struct class_attribute *class_attr)
1360 {
1361         class_remove_file(&net_class, class_attr);
1362 }
1363 EXPORT_SYMBOL(netdev_class_remove_file);
1364
1365 int netdev_kobject_init(void)
1366 {
1367         kobj_ns_type_register(&net_ns_type_operations);
1368         register_pernet_subsys(&kobj_net_ops);
1369         return class_register(&net_class);
1370 }