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 <net/sock.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/wireless.h>
  19 #include <net/wext.h>
  20
  21 #include "net-sysfs.h"
  22
  23 #ifdef CONFIG_SYSFS
  24 static const char fmt_hex[] = "%#x\n";
  25 static const char fmt_long_hex[] = "%#lx\n";
  26 static const char fmt_dec[] = "%d\n";
  27 static const char fmt_ulong[] = "%lu\n";
  28
  29 static inline int dev_isalive(const struct net_device *dev)
  30 {
  31         return dev->reg_state <= NETREG_REGISTERED;
  32 }
  33
  34 /* use same locking rules as GIF* ioctl's */
  35 static ssize_t netdev_show(const struct device *dev,
  36                            struct device_attribute *attr, char *buf,
  37                            ssize_t (*format)(const struct net_device *, char *))
  38 {
  39         struct net_device *net = to_net_dev(dev);
  40         ssize_t ret = -EINVAL;
  41
  42         read_lock(&dev_base_lock);
  43         if (dev_isalive(net))
  44                 ret = (*format)(net, buf);
  45         read_unlock(&dev_base_lock);
  46
  47         return ret;
  48 }
  49
  50 /* generate a show function for simple field */
  51 #define NETDEVICE_SHOW(field, format_string)                            \
  52 static ssize_t format_##field(const struct net_device *net, char *buf)  \
  53 {                                                                       \
  54         return sprintf(buf, format_string, net->field);                 \
  55 }                                                                       \
  56 static ssize_t show_##field(struct device *dev,                         \
  57                             struct device_attribute *attr, char *buf)   \
  58 {                                                                       \
  59         return netdev_show(dev, attr, buf, format_##field);             \
  60 }
  61
  62
  63 /* use same locking and permission rules as SIF* ioctl's */
  64 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  65                             const char *buf, size_t len,
  66                             int (*set)(struct net_device *, unsigned long))
  67 {
  68         struct net_device *net = to_net_dev(dev);
  69         char *endp;
  70         unsigned long new;
  71         int ret = -EINVAL;
  72
  73         if (!capable(CAP_NET_ADMIN))
  74                 return -EPERM;
  75
  76         new = simple_strtoul(buf, &endp, 0);
  77         if (endp == buf)
  78                 goto err;
  79
  80         if (!rtnl_trylock())
  81                 return restart_syscall();
  82
  83         if (dev_isalive(net)) {
  84                 if ((ret = (*set)(net, new)) == 0)
  85                         ret = len;
  86         }
  87         rtnl_unlock();
  88  err:
  89         return ret;
  90 }
  91
  92 NETDEVICE_SHOW(dev_id, fmt_hex);
  93 NETDEVICE_SHOW(addr_len, fmt_dec);
  94 NETDEVICE_SHOW(iflink, fmt_dec);
  95 NETDEVICE_SHOW(ifindex, fmt_dec);
  96 NETDEVICE_SHOW(features, fmt_long_hex);
  97 NETDEVICE_SHOW(type, fmt_dec);
  98 NETDEVICE_SHOW(link_mode, fmt_dec);
  99
 100 /* use same locking rules as GIFHWADDR ioctl's */
 101 static ssize_t show_address(struct device *dev, struct device_attribute *attr,
 102                             char *buf)
 103 {
 104         struct net_device *net = to_net_dev(dev);
 105         ssize_t ret = -EINVAL;
 106
 107         read_lock(&dev_base_lock);
 108         if (dev_isalive(net))
 109                 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
 110         read_unlock(&dev_base_lock);
 111         return ret;
 112 }
 113
 114 static ssize_t show_broadcast(struct device *dev,
 115                             struct device_attribute *attr, char *buf)
 116 {
 117         struct net_device *net = to_net_dev(dev);
 118         if (dev_isalive(net))
 119                 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
 120         return -EINVAL;
 121 }
 122
 123 static ssize_t show_carrier(struct device *dev,
 124                             struct device_attribute *attr, char *buf)
 125 {
 126         struct net_device *netdev = to_net_dev(dev);
 127         if (netif_running(netdev)) {
 128                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 129         }
 130         return -EINVAL;
 131 }
 132
 133 static ssize_t show_speed(struct device *dev,
 134                           struct device_attribute *attr, char *buf)
 135 {
 136         struct net_device *netdev = to_net_dev(dev);
 137         int ret = -EINVAL;
 138
 139         if (!rtnl_trylock())
 140                 return restart_syscall();
 141
 142         if (netif_running(netdev) &&
 143             netdev->ethtool_ops &&
 144             netdev->ethtool_ops->get_settings) {
 145                 struct ethtool_cmd cmd = { ETHTOOL_GSET };
 146
 147                 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
 148                         ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd));
 149         }
 150         rtnl_unlock();
 151         return ret;
 152 }
 153
 154 static ssize_t show_duplex(struct device *dev,
 155                            struct device_attribute *attr, char *buf)
 156 {
 157         struct net_device *netdev = to_net_dev(dev);
 158         int ret = -EINVAL;
 159
 160         if (!rtnl_trylock())
 161                 return restart_syscall();
 162
 163         if (netif_running(netdev) &&
 164             netdev->ethtool_ops &&
 165             netdev->ethtool_ops->get_settings) {
 166                 struct ethtool_cmd cmd = { ETHTOOL_GSET };
 167
 168                 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
 169                         ret = sprintf(buf, "%s\n", cmd.duplex ? "full" : "half");
 170         }
 171         rtnl_unlock();
 172         return ret;
 173 }
 174
 175 static ssize_t show_dormant(struct device *dev,
 176                             struct device_attribute *attr, char *buf)
 177 {
 178         struct net_device *netdev = to_net_dev(dev);
 179
 180         if (netif_running(netdev))
 181                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 182
 183         return -EINVAL;
 184 }
 185
 186 static const char *const operstates[] = {
 187         "unknown",
 188         "notpresent", /* currently unused */
 189         "down",
 190         "lowerlayerdown",
 191         "testing", /* currently unused */
 192         "dormant",
 193         "up"
 194 };
 195
 196 static ssize_t show_operstate(struct device *dev,
 197                               struct device_attribute *attr, char *buf)
 198 {
 199         const struct net_device *netdev = to_net_dev(dev);
 200         unsigned char operstate;
 201
 202         read_lock(&dev_base_lock);
 203         operstate = netdev->operstate;
 204         if (!netif_running(netdev))
 205                 operstate = IF_OPER_DOWN;
 206         read_unlock(&dev_base_lock);
 207
 208         if (operstate >= ARRAY_SIZE(operstates))
 209                 return -EINVAL; /* should not happen */
 210
 211         return sprintf(buf, "%s\n", operstates[operstate]);
 212 }
 213
 214 /* read-write attributes */
 215 NETDEVICE_SHOW(mtu, fmt_dec);
 216
 217 static int change_mtu(struct net_device *net, unsigned long new_mtu)
 218 {
 219         return dev_set_mtu(net, (int) new_mtu);
 220 }
 221
 222 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
 223                          const char *buf, size_t len)
 224 {
 225         return netdev_store(dev, attr, buf, len, change_mtu);
 226 }
 227
 228 NETDEVICE_SHOW(flags, fmt_hex);
 229
 230 static int change_flags(struct net_device *net, unsigned long new_flags)
 231 {
 232         return dev_change_flags(net, (unsigned) new_flags);
 233 }
 234
 235 static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
 236                            const char *buf, size_t len)
 237 {
 238         return netdev_store(dev, attr, buf, len, change_flags);
 239 }
 240
 241 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
 242
 243 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
 244 {
 245         net->tx_queue_len = new_len;
 246         return 0;
 247 }
 248
 249 static ssize_t store_tx_queue_len(struct device *dev,
 250                                   struct device_attribute *attr,
 251                                   const char *buf, size_t len)
 252 {
 253         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
 254 }
 255
 256 static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
 257                              const char *buf, size_t len)
 258 {
 259         struct net_device *netdev = to_net_dev(dev);
 260         size_t count = len;
 261         ssize_t ret;
 262
 263         if (!capable(CAP_NET_ADMIN))
 264                 return -EPERM;
 265
 266         /* ignore trailing newline */
 267         if (len >  0 && buf[len - 1] == '\n')
 268                 --count;
 269
 270         if (!rtnl_trylock())
 271                 return restart_syscall();
 272         ret = dev_set_alias(netdev, buf, count);
 273         rtnl_unlock();
 274
 275         return ret < 0 ? ret : len;
 276 }
 277
 278 static ssize_t show_ifalias(struct device *dev,
 279                             struct device_attribute *attr, char *buf)
 280 {
 281         const struct net_device *netdev = to_net_dev(dev);
 282         ssize_t ret = 0;
 283
 284         if (!rtnl_trylock())
 285                 return restart_syscall();
 286         if (netdev->ifalias)
 287                 ret = sprintf(buf, "%s\n", netdev->ifalias);
 288         rtnl_unlock();
 289         return ret;
 290 }
 291
 292 static struct device_attribute net_class_attributes[] = {
 293         __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
 294         __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
 295         __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
 296         __ATTR(iflink, S_IRUGO, show_iflink, NULL),
 297         __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
 298         __ATTR(features, S_IRUGO, show_features, NULL),
 299         __ATTR(type, S_IRUGO, show_type, NULL),
 300         __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
 301         __ATTR(address, S_IRUGO, show_address, NULL),
 302         __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
 303         __ATTR(carrier, S_IRUGO, show_carrier, NULL),
 304         __ATTR(speed, S_IRUGO, show_speed, NULL),
 305         __ATTR(duplex, S_IRUGO, show_duplex, NULL),
 306         __ATTR(dormant, S_IRUGO, show_dormant, NULL),
 307         __ATTR(operstate, S_IRUGO, show_operstate, NULL),
 308         __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
 309         __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
 310         __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
 311                store_tx_queue_len),
 312         {}
 313 };
 314
 315 /* Show a given an attribute in the statistics group */
 316 static ssize_t netstat_show(const struct device *d,
 317                             struct device_attribute *attr, char *buf,
 318                             unsigned long offset)
 319 {
 320         struct net_device *dev = to_net_dev(d);
 321         ssize_t ret = -EINVAL;
 322
 323         WARN_ON(offset > sizeof(struct net_device_stats) ||
 324                         offset % sizeof(unsigned long) != 0);
 325
 326         read_lock(&dev_base_lock);
 327         if (dev_isalive(dev)) {
 328                 const struct net_device_stats *stats = dev_get_stats(dev);
 329                 ret = sprintf(buf, fmt_ulong,
 330                               *(unsigned long *)(((u8 *) stats) + offset));
 331         }
 332         read_unlock(&dev_base_lock);
 333         return ret;
 334 }
 335
 336 /* generate a read-only statistics attribute */
 337 #define NETSTAT_ENTRY(name)                                             \
 338 static ssize_t show_##name(struct device *d,                            \
 339                            struct device_attribute *attr, char *buf)    \
 340 {                                                                       \
 341         return netstat_show(d, attr, buf,                               \
 342                             offsetof(struct net_device_stats, name));   \
 343 }                                                                       \
 344 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
 345
 346 NETSTAT_ENTRY(rx_packets);
 347 NETSTAT_ENTRY(tx_packets);
 348 NETSTAT_ENTRY(rx_bytes);
 349 NETSTAT_ENTRY(tx_bytes);
 350 NETSTAT_ENTRY(rx_errors);
 351 NETSTAT_ENTRY(tx_errors);
 352 NETSTAT_ENTRY(rx_dropped);
 353 NETSTAT_ENTRY(tx_dropped);
 354 NETSTAT_ENTRY(multicast);
 355 NETSTAT_ENTRY(collisions);
 356 NETSTAT_ENTRY(rx_length_errors);
 357 NETSTAT_ENTRY(rx_over_errors);
 358 NETSTAT_ENTRY(rx_crc_errors);
 359 NETSTAT_ENTRY(rx_frame_errors);
 360 NETSTAT_ENTRY(rx_fifo_errors);
 361 NETSTAT_ENTRY(rx_missed_errors);
 362 NETSTAT_ENTRY(tx_aborted_errors);
 363 NETSTAT_ENTRY(tx_carrier_errors);
 364 NETSTAT_ENTRY(tx_fifo_errors);
 365 NETSTAT_ENTRY(tx_heartbeat_errors);
 366 NETSTAT_ENTRY(tx_window_errors);
 367 NETSTAT_ENTRY(rx_compressed);
 368 NETSTAT_ENTRY(tx_compressed);
 369
 370 static struct attribute *netstat_attrs[] = {
 371         &dev_attr_rx_packets.attr,
 372         &dev_attr_tx_packets.attr,
 373         &dev_attr_rx_bytes.attr,
 374         &dev_attr_tx_bytes.attr,
 375         &dev_attr_rx_errors.attr,
 376         &dev_attr_tx_errors.attr,
 377         &dev_attr_rx_dropped.attr,
 378         &dev_attr_tx_dropped.attr,
 379         &dev_attr_multicast.attr,
 380         &dev_attr_collisions.attr,
 381         &dev_attr_rx_length_errors.attr,
 382         &dev_attr_rx_over_errors.attr,
 383         &dev_attr_rx_crc_errors.attr,
 384         &dev_attr_rx_frame_errors.attr,
 385         &dev_attr_rx_fifo_errors.attr,
 386         &dev_attr_rx_missed_errors.attr,
 387         &dev_attr_tx_aborted_errors.attr,
 388         &dev_attr_tx_carrier_errors.attr,
 389         &dev_attr_tx_fifo_errors.attr,
 390         &dev_attr_tx_heartbeat_errors.attr,
 391         &dev_attr_tx_window_errors.attr,
 392         &dev_attr_rx_compressed.attr,
 393         &dev_attr_tx_compressed.attr,
 394         NULL
 395 };
 396
 397
 398 static struct attribute_group netstat_group = {
 399         .name  = "statistics",
 400         .attrs  = netstat_attrs,
 401 };
 402
 403 #ifdef CONFIG_WIRELESS_EXT_SYSFS
 404 /* helper function that does all the locking etc for wireless stats */
 405 static ssize_t wireless_show(struct device *d, char *buf,
 406                              ssize_t (*format)(const struct iw_statistics *,
 407                                                char *))
 408 {
 409         struct net_device *dev = to_net_dev(d);
 410         const struct iw_statistics *iw;
 411         ssize_t ret = -EINVAL;
 412
 413         if (!rtnl_trylock())
 414                 return restart_syscall();
 415         if (dev_isalive(dev)) {
 416                 iw = get_wireless_stats(dev);
 417                 if (iw)
 418                         ret = (*format)(iw, buf);
 419         }
 420         rtnl_unlock();
 421
 422         return ret;
 423 }
 424
 425 /* show function template for wireless fields */
 426 #define WIRELESS_SHOW(name, field, format_string)                       \
 427 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
 428 {                                                                       \
 429         return sprintf(buf, format_string, iw->field);                  \
 430 }                                                                       \
 431 static ssize_t show_iw_##name(struct device *d,                         \
 432                               struct device_attribute *attr, char *buf) \
 433 {                                                                       \
 434         return wireless_show(d, buf, format_iw_##name);                 \
 435 }                                                                       \
 436 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
 437
 438 WIRELESS_SHOW(status, status, fmt_hex);
 439 WIRELESS_SHOW(link, qual.qual, fmt_dec);
 440 WIRELESS_SHOW(level, qual.level, fmt_dec);
 441 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
 442 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
 443 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
 444 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
 445 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
 446 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
 447 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
 448
 449 static struct attribute *wireless_attrs[] = {
 450         &dev_attr_status.attr,
 451         &dev_attr_link.attr,
 452         &dev_attr_level.attr,
 453         &dev_attr_noise.attr,
 454         &dev_attr_nwid.attr,
 455         &dev_attr_crypt.attr,
 456         &dev_attr_fragment.attr,
 457         &dev_attr_retries.attr,
 458         &dev_attr_misc.attr,
 459         &dev_attr_beacon.attr,
 460         NULL
 461 };
 462
 463 static struct attribute_group wireless_group = {
 464         .name = "wireless",
 465         .attrs = wireless_attrs,
 466 };
 467 #endif
 468
 469 #ifdef CONFIG_RPS
 470 /*
 471  * RX queue sysfs structures and functions.
 472  */
 473 struct rx_queue_attribute {
 474         struct attribute attr;
 475         ssize_t (*show)(struct netdev_rx_queue *queue,
 476             struct rx_queue_attribute *attr, char *buf);
 477         ssize_t (*store)(struct netdev_rx_queue *queue,
 478             struct rx_queue_attribute *attr, const char *buf, size_t len);
 479 };
 480 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 481     struct rx_queue_attribute, attr)
 482
 483 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 484
 485 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 486                                   char *buf)
 487 {
 488         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 489         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 490
 491         if (!attribute->show)
 492                 return -EIO;
 493
 494         return attribute->show(queue, attribute, buf);
 495 }
 496
 497 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 498                                    const char *buf, size_t count)
 499 {
 500         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 501         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 502
 503         if (!attribute->store)
 504                 return -EIO;
 505
 506         return attribute->store(queue, attribute, buf, count);
 507 }
 508
 509 static struct sysfs_ops rx_queue_sysfs_ops = {
 510         .show = rx_queue_attr_show,
 511         .store = rx_queue_attr_store,
 512 };
 513
 514 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 515                             struct rx_queue_attribute *attribute, char *buf)
 516 {
 517         struct rps_map *map;
 518         cpumask_var_t mask;
 519         size_t len = 0;
 520         int i;
 521
 522         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 523                 return -ENOMEM;
 524
 525         rcu_read_lock();
 526         map = rcu_dereference(queue->rps_map);
 527         if (map)
 528                 for (i = 0; i < map->len; i++)
 529                         cpumask_set_cpu(map->cpus[i], mask);
 530
 531         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 532         if (PAGE_SIZE - len < 3) {
 533                 rcu_read_unlock();
 534                 free_cpumask_var(mask);
 535                 return -EINVAL;
 536         }
 537         rcu_read_unlock();
 538
 539         free_cpumask_var(mask);
 540         len += sprintf(buf + len, "\n");
 541         return len;
 542 }
 543
 544 static void rps_map_release(struct rcu_head *rcu)
 545 {
 546         struct rps_map *map = container_of(rcu, struct rps_map, rcu);
 547
 548         kfree(map);
 549 }
 550
 551 ssize_t store_rps_map(struct netdev_rx_queue *queue,
 552                       struct rx_queue_attribute *attribute,
 553                       const char *buf, size_t len)
 554 {
 555         struct rps_map *old_map, *map;
 556         cpumask_var_t mask;
 557         int err, cpu, i;
 558         static DEFINE_SPINLOCK(rps_map_lock);
 559
 560         if (!capable(CAP_NET_ADMIN))
 561                 return -EPERM;
 562
 563         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 564                 return -ENOMEM;
 565
 566         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 567         if (err) {
 568                 free_cpumask_var(mask);
 569                 return err;
 570         }
 571
 572         map = kzalloc(max_t(unsigned,
 573             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 574             GFP_KERNEL);
 575         if (!map) {
 576                 free_cpumask_var(mask);
 577                 return -ENOMEM;
 578         }
 579
 580         i = 0;
 581         for_each_cpu_and(cpu, mask, cpu_online_mask)
 582                 map->cpus[i++] = cpu;
 583
 584         if (i)
 585                 map->len = i;
 586         else {
 587                 kfree(map);
 588                 map = NULL;
 589         }
 590
 591         spin_lock(&rps_map_lock);
 592         old_map = queue->rps_map;
 593         rcu_assign_pointer(queue->rps_map, map);
 594         spin_unlock(&rps_map_lock);
 595
 596         if (old_map)
 597                 call_rcu(&old_map->rcu, rps_map_release);
 598
 599         free_cpumask_var(mask);
 600         return len;
 601 }
 602
 603 static struct rx_queue_attribute rps_cpus_attribute =
 604         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 605
 606 static struct attribute *rx_queue_default_attrs[] = {
 607         &rps_cpus_attribute.attr,
 608         NULL
 609 };
 610
 611 static void rx_queue_release(struct kobject *kobj)
 612 {
 613         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 614         struct rps_map *map = queue->rps_map;
 615         struct netdev_rx_queue *first = queue->first;
 616
 617         if (map)
 618                 call_rcu(&map->rcu, rps_map_release);
 619
 620         if (atomic_dec_and_test(&first->count))
 621                 kfree(first);
 622 }
 623
 624 static struct kobj_type rx_queue_ktype = {
 625         .sysfs_ops = &rx_queue_sysfs_ops,
 626         .release = rx_queue_release,
 627         .default_attrs = rx_queue_default_attrs,
 628 };
 629
 630 static int rx_queue_add_kobject(struct net_device *net, int index)
 631 {
 632         struct netdev_rx_queue *queue = net->_rx + index;
 633         struct kobject *kobj = &queue->kobj;
 634         int error = 0;
 635
 636         kobj->kset = net->queues_kset;
 637         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 638             "rx-%u", index);
 639         if (error) {
 640                 kobject_put(kobj);
 641                 return error;
 642         }
 643
 644         kobject_uevent(kobj, KOBJ_ADD);
 645
 646         return error;
 647 }
 648
 649 static int rx_queue_register_kobjects(struct net_device *net)
 650 {
 651         int i;
 652         int error = 0;
 653
 654         net->queues_kset = kset_create_and_add("queues",
 655             NULL, &net->dev.kobj);
 656         if (!net->queues_kset)
 657                 return -ENOMEM;
 658         for (i = 0; i < net->num_rx_queues; i++) {
 659                 error = rx_queue_add_kobject(net, i);
 660                 if (error)
 661                         break;
 662         }
 663
 664         if (error)
 665                 while (--i >= 0)
 666                         kobject_put(&net->_rx[i].kobj);
 667
 668         return error;
 669 }
 670
 671 static void rx_queue_remove_kobjects(struct net_device *net)
 672 {
 673         int i;
 674
 675         for (i = 0; i < net->num_rx_queues; i++)
 676                 kobject_put(&net->_rx[i].kobj);
 677         kset_unregister(net->queues_kset);
 678 }
 679 #endif /* CONFIG_RPS */
 680 #endif /* CONFIG_SYSFS */
 681
 682 #ifdef CONFIG_HOTPLUG
 683 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
 684 {
 685         struct net_device *dev = to_net_dev(d);
 686         int retval;
 687
 688         if (!net_eq(dev_net(dev), &init_net))
 689                 return 0;
 690
 691         /* pass interface to uevent. */
 692         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
 693         if (retval)
 694                 goto exit;
 695
 696         /* pass ifindex to uevent.
 697          * ifindex is useful as it won't change (interface name may change)
 698          * and is what RtNetlink uses natively. */
 699         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
 700
 701 exit:
 702         return retval;
 703 }
 704 #endif
 705
 706 /*
 707  *      netdev_release -- destroy and free a dead device.
 708  *      Called when last reference to device kobject is gone.
 709  */
 710 static void netdev_release(struct device *d)
 711 {
 712         struct net_device *dev = to_net_dev(d);
 713
 714         BUG_ON(dev->reg_state != NETREG_RELEASED);
 715
 716         kfree(dev->ifalias);
 717         kfree((char *)dev - dev->padded);
 718 }
 719
 720 static struct class net_class = {
 721         .name = "net",
 722         .dev_release = netdev_release,
 723 #ifdef CONFIG_SYSFS
 724         .dev_attrs = net_class_attributes,
 725 #endif /* CONFIG_SYSFS */
 726 #ifdef CONFIG_HOTPLUG
 727         .dev_uevent = netdev_uevent,
 728 #endif
 729 };
 730
 731 /* Delete sysfs entries but hold kobject reference until after all
 732  * netdev references are gone.
 733  */
 734 void netdev_unregister_kobject(struct net_device * net)
 735 {
 736         struct device *dev = &(net->dev);
 737
 738         kobject_get(&dev->kobj);
 739
 740         if (!net_eq(dev_net(net), &init_net))
 741                 return;
 742
 743 #ifdef CONFIG_RPS
 744         rx_queue_remove_kobjects(net);
 745 #endif
 746
 747         device_del(dev);
 748 }
 749
 750 /* Create sysfs entries for network device. */
 751 int netdev_register_kobject(struct net_device *net)
 752 {
 753         struct device *dev = &(net->dev);
 754         const struct attribute_group **groups = net->sysfs_groups;
 755         int error = 0;
 756
 757         dev->class = &net_class;
 758         dev->platform_data = net;
 759         dev->groups = groups;
 760
 761         dev_set_name(dev, "%s", net->name);
 762
 763 #ifdef CONFIG_SYSFS
 764         /* Allow for a device specific group */
 765         if (*groups)
 766                 groups++;
 767
 768         *groups++ = &netstat_group;
 769 #ifdef CONFIG_WIRELESS_EXT_SYSFS
 770         if (net->ieee80211_ptr)
 771                 *groups++ = &wireless_group;
 772 #ifdef CONFIG_WIRELESS_EXT
 773         else if (net->wireless_handlers)
 774                 *groups++ = &wireless_group;
 775 #endif
 776 #endif
 777 #endif /* CONFIG_SYSFS */
 778
 779         if (!net_eq(dev_net(net), &init_net))
 780                 return 0;
 781
 782         error = device_add(dev);
 783         if (error)
 784                 return error;
 785
 786 #ifdef CONFIG_RPS
 787         error = rx_queue_register_kobjects(net);
 788         if (error) {
 789                 device_del(dev);
 790                 return error;
 791         }
 792 #endif
 793
 794         return error;
 795 }
 796
 797 int netdev_class_create_file(struct class_attribute *class_attr)
 798 {
 799         return class_create_file(&net_class, class_attr);
 800 }
 801
 802 void netdev_class_remove_file(struct class_attribute *class_attr)
 803 {
 804         class_remove_file(&net_class, class_attr);
 805 }
 806
 807 EXPORT_SYMBOL(netdev_class_create_file);
 808 EXPORT_SYMBOL(netdev_class_remove_file);
 809
 810 void netdev_initialize_kobject(struct net_device *net)
 811 {
 812         struct device *device = &(net->dev);
 813         device_initialize(device);
 814 }
 815
 816 int netdev_kobject_init(void)
 817 {
 818         return class_register(&net_class);
 819 }