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/vmalloc.h>
  22 #include <linux/export.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/pm_runtime.h>
  25
  26 #include "net-sysfs.h"
  27
  28 #ifdef CONFIG_SYSFS
  29 static const char fmt_hex[] = "%#x\n";
  30 static const char fmt_long_hex[] = "%#lx\n";
  31 static const char fmt_dec[] = "%d\n";
  32 static const char fmt_udec[] = "%u\n";
  33 static const char fmt_ulong[] = "%lu\n";
  34 static const char fmt_u64[] = "%llu\n";
  35
  36 static inline int dev_isalive(const struct net_device *dev)
  37 {
  38         return dev->reg_state <= NETREG_REGISTERED;
  39 }
  40
  41 /* use same locking rules as GIF* ioctl's */
  42 static ssize_t netdev_show(const struct device *dev,
  43                            struct device_attribute *attr, char *buf,
  44                            ssize_t (*format)(const struct net_device *, char *))
  45 {
  46         struct net_device *ndev = to_net_dev(dev);
  47         ssize_t ret = -EINVAL;
  48
  49         read_lock(&dev_base_lock);
  50         if (dev_isalive(ndev))
  51                 ret = (*format)(ndev, buf);
  52         read_unlock(&dev_base_lock);
  53
  54         return ret;
  55 }
  56
  57 /* generate a show function for simple field */
  58 #define NETDEVICE_SHOW(field, format_string)                            \
  59 static ssize_t format_##field(const struct net_device *dev, char *buf)  \
  60 {                                                                       \
  61         return sprintf(buf, format_string, dev->field);                 \
  62 }                                                                       \
  63 static ssize_t field##_show(struct device *dev,                         \
  64                             struct device_attribute *attr, char *buf)   \
  65 {                                                                       \
  66         return netdev_show(dev, attr, buf, format_##field);             \
  67 }                                                                       \
  68
  69 #define NETDEVICE_SHOW_RO(field, format_string)                         \
  70 NETDEVICE_SHOW(field, format_string);                                   \
  71 static DEVICE_ATTR_RO(field)
  72
  73 #define NETDEVICE_SHOW_RW(field, format_string)                         \
  74 NETDEVICE_SHOW(field, format_string);                                   \
  75 static DEVICE_ATTR_RW(field)
  76
  77 /* use same locking and permission rules as SIF* ioctl's */
  78 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  79                             const char *buf, size_t len,
  80                             int (*set)(struct net_device *, unsigned long))
  81 {
  82         struct net_device *netdev = to_net_dev(dev);
  83         struct net *net = dev_net(netdev);
  84         unsigned long new;
  85         int ret = -EINVAL;
  86
  87         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  88                 return -EPERM;
  89
  90         ret = kstrtoul(buf, 0, &new);
  91         if (ret)
  92                 goto err;
  93
  94         if (!rtnl_trylock())
  95                 return restart_syscall();
  96
  97         if (dev_isalive(netdev)) {
  98                 if ((ret = (*set)(netdev, new)) == 0)
  99                         ret = len;
 100         }
 101         rtnl_unlock();
 102  err:
 103         return ret;
 104 }
 105
 106 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 107 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 108 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 109 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 110 NETDEVICE_SHOW_RO(iflink, fmt_dec);
 111 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 112 NETDEVICE_SHOW_RO(type, fmt_dec);
 113 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 114
 115 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 116 {
 117         return sprintf(buf, fmt_dec, dev->name_assign_type);
 118 }
 119
 120 static ssize_t name_assign_type_show(struct device *dev,
 121                                      struct device_attribute *attr,
 122                                      char *buf)
 123 {
 124         struct net_device *ndev = to_net_dev(dev);
 125         ssize_t ret = -EINVAL;
 126
 127         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
 128                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
 129
 130         return ret;
 131 }
 132 static DEVICE_ATTR_RO(name_assign_type);
 133
 134 /* use same locking rules as GIFHWADDR ioctl's */
 135 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 136                             char *buf)
 137 {
 138         struct net_device *ndev = to_net_dev(dev);
 139         ssize_t ret = -EINVAL;
 140
 141         read_lock(&dev_base_lock);
 142         if (dev_isalive(ndev))
 143                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 144         read_unlock(&dev_base_lock);
 145         return ret;
 146 }
 147 static DEVICE_ATTR_RO(address);
 148
 149 static ssize_t broadcast_show(struct device *dev,
 150                               struct device_attribute *attr, char *buf)
 151 {
 152         struct net_device *ndev = to_net_dev(dev);
 153         if (dev_isalive(ndev))
 154                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
 155         return -EINVAL;
 156 }
 157 static DEVICE_ATTR_RO(broadcast);
 158
 159 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
 160 {
 161         if (!netif_running(dev))
 162                 return -EINVAL;
 163         return dev_change_carrier(dev, (bool) new_carrier);
 164 }
 165
 166 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 167                              const char *buf, size_t len)
 168 {
 169         return netdev_store(dev, attr, buf, len, change_carrier);
 170 }
 171
 172 static ssize_t carrier_show(struct device *dev,
 173                             struct device_attribute *attr, char *buf)
 174 {
 175         struct net_device *netdev = to_net_dev(dev);
 176         if (netif_running(netdev)) {
 177                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 178         }
 179         return -EINVAL;
 180 }
 181 static DEVICE_ATTR_RW(carrier);
 182
 183 static ssize_t speed_show(struct device *dev,
 184                           struct device_attribute *attr, char *buf)
 185 {
 186         struct net_device *netdev = to_net_dev(dev);
 187         int ret = -EINVAL;
 188
 189         if (!rtnl_trylock())
 190                 return restart_syscall();
 191
 192         if (netif_running(netdev)) {
 193                 struct ethtool_cmd cmd;
 194                 if (!__ethtool_get_settings(netdev, &cmd))
 195                         ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
 196         }
 197         rtnl_unlock();
 198         return ret;
 199 }
 200 static DEVICE_ATTR_RO(speed);
 201
 202 static ssize_t duplex_show(struct device *dev,
 203                            struct device_attribute *attr, char *buf)
 204 {
 205         struct net_device *netdev = to_net_dev(dev);
 206         int ret = -EINVAL;
 207
 208         if (!rtnl_trylock())
 209                 return restart_syscall();
 210
 211         if (netif_running(netdev)) {
 212                 struct ethtool_cmd cmd;
 213                 if (!__ethtool_get_settings(netdev, &cmd)) {
 214                         const char *duplex;
 215                         switch (cmd.duplex) {
 216                         case DUPLEX_HALF:
 217                                 duplex = "half";
 218                                 break;
 219                         case DUPLEX_FULL:
 220                                 duplex = "full";
 221                                 break;
 222                         default:
 223                                 duplex = "unknown";
 224                                 break;
 225                         }
 226                         ret = sprintf(buf, "%s\n", duplex);
 227                 }
 228         }
 229         rtnl_unlock();
 230         return ret;
 231 }
 232 static DEVICE_ATTR_RO(duplex);
 233
 234 static ssize_t dormant_show(struct device *dev,
 235                             struct device_attribute *attr, char *buf)
 236 {
 237         struct net_device *netdev = to_net_dev(dev);
 238
 239         if (netif_running(netdev))
 240                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 241
 242         return -EINVAL;
 243 }
 244 static DEVICE_ATTR_RO(dormant);
 245
 246 static const char *const operstates[] = {
 247         "unknown",
 248         "notpresent", /* currently unused */
 249         "down",
 250         "lowerlayerdown",
 251         "testing", /* currently unused */
 252         "dormant",
 253         "up"
 254 };
 255
 256 static ssize_t operstate_show(struct device *dev,
 257                               struct device_attribute *attr, char *buf)
 258 {
 259         const struct net_device *netdev = to_net_dev(dev);
 260         unsigned char operstate;
 261
 262         read_lock(&dev_base_lock);
 263         operstate = netdev->operstate;
 264         if (!netif_running(netdev))
 265                 operstate = IF_OPER_DOWN;
 266         read_unlock(&dev_base_lock);
 267
 268         if (operstate >= ARRAY_SIZE(operstates))
 269                 return -EINVAL; /* should not happen */
 270
 271         return sprintf(buf, "%s\n", operstates[operstate]);
 272 }
 273 static DEVICE_ATTR_RO(operstate);
 274
 275 static ssize_t carrier_changes_show(struct device *dev,
 276                                     struct device_attribute *attr,
 277                                     char *buf)
 278 {
 279         struct net_device *netdev = to_net_dev(dev);
 280         return sprintf(buf, fmt_dec,
 281                        atomic_read(&netdev->carrier_changes));
 282 }
 283 static DEVICE_ATTR_RO(carrier_changes);
 284
 285 /* read-write attributes */
 286
 287 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 288 {
 289         return dev_set_mtu(dev, (int) new_mtu);
 290 }
 291
 292 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 293                          const char *buf, size_t len)
 294 {
 295         return netdev_store(dev, attr, buf, len, change_mtu);
 296 }
 297 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 298
 299 static int change_flags(struct net_device *dev, unsigned long new_flags)
 300 {
 301         return dev_change_flags(dev, (unsigned int) new_flags);
 302 }
 303
 304 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 305                            const char *buf, size_t len)
 306 {
 307         return netdev_store(dev, attr, buf, len, change_flags);
 308 }
 309 NETDEVICE_SHOW_RW(flags, fmt_hex);
 310
 311 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
 312 {
 313         dev->tx_queue_len = new_len;
 314         return 0;
 315 }
 316
 317 static ssize_t tx_queue_len_store(struct device *dev,
 318                                   struct device_attribute *attr,
 319                                   const char *buf, size_t len)
 320 {
 321         if (!capable(CAP_NET_ADMIN))
 322                 return -EPERM;
 323
 324         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
 325 }
 326 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
 327
 328 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 329                              const char *buf, size_t len)
 330 {
 331         struct net_device *netdev = to_net_dev(dev);
 332         struct net *net = dev_net(netdev);
 333         size_t count = len;
 334         ssize_t ret;
 335
 336         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 337                 return -EPERM;
 338
 339         /* ignore trailing newline */
 340         if (len >  0 && buf[len - 1] == '\n')
 341                 --count;
 342
 343         if (!rtnl_trylock())
 344                 return restart_syscall();
 345         ret = dev_set_alias(netdev, buf, count);
 346         rtnl_unlock();
 347
 348         return ret < 0 ? ret : len;
 349 }
 350
 351 static ssize_t ifalias_show(struct device *dev,
 352                             struct device_attribute *attr, char *buf)
 353 {
 354         const struct net_device *netdev = to_net_dev(dev);
 355         ssize_t ret = 0;
 356
 357         if (!rtnl_trylock())
 358                 return restart_syscall();
 359         if (netdev->ifalias)
 360                 ret = sprintf(buf, "%s\n", netdev->ifalias);
 361         rtnl_unlock();
 362         return ret;
 363 }
 364 static DEVICE_ATTR_RW(ifalias);
 365
 366 static int change_group(struct net_device *dev, unsigned long new_group)
 367 {
 368         dev_set_group(dev, (int) new_group);
 369         return 0;
 370 }
 371
 372 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 373                            const char *buf, size_t len)
 374 {
 375         return netdev_store(dev, attr, buf, len, change_group);
 376 }
 377 NETDEVICE_SHOW(group, fmt_dec);
 378 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
 379
 380 static ssize_t phys_port_id_show(struct device *dev,
 381                                  struct device_attribute *attr, char *buf)
 382 {
 383         struct net_device *netdev = to_net_dev(dev);
 384         ssize_t ret = -EINVAL;
 385
 386         if (!rtnl_trylock())
 387                 return restart_syscall();
 388
 389         if (dev_isalive(netdev)) {
 390                 struct netdev_phys_port_id ppid;
 391
 392                 ret = dev_get_phys_port_id(netdev, &ppid);
 393                 if (!ret)
 394                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 395         }
 396         rtnl_unlock();
 397
 398         return ret;
 399 }
 400 static DEVICE_ATTR_RO(phys_port_id);
 401
 402 static struct attribute *net_class_attrs[] = {
 403         &dev_attr_netdev_group.attr,
 404         &dev_attr_type.attr,
 405         &dev_attr_dev_id.attr,
 406         &dev_attr_dev_port.attr,
 407         &dev_attr_iflink.attr,
 408         &dev_attr_ifindex.attr,
 409         &dev_attr_name_assign_type.attr,
 410         &dev_attr_addr_assign_type.attr,
 411         &dev_attr_addr_len.attr,
 412         &dev_attr_link_mode.attr,
 413         &dev_attr_address.attr,
 414         &dev_attr_broadcast.attr,
 415         &dev_attr_speed.attr,
 416         &dev_attr_duplex.attr,
 417         &dev_attr_dormant.attr,
 418         &dev_attr_operstate.attr,
 419         &dev_attr_carrier_changes.attr,
 420         &dev_attr_ifalias.attr,
 421         &dev_attr_carrier.attr,
 422         &dev_attr_mtu.attr,
 423         &dev_attr_flags.attr,
 424         &dev_attr_tx_queue_len.attr,
 425         &dev_attr_phys_port_id.attr,
 426         NULL,
 427 };
 428 ATTRIBUTE_GROUPS(net_class);
 429
 430 /* Show a given an attribute in the statistics group */
 431 static ssize_t netstat_show(const struct device *d,
 432                             struct device_attribute *attr, char *buf,
 433                             unsigned long offset)
 434 {
 435         struct net_device *dev = to_net_dev(d);
 436         ssize_t ret = -EINVAL;
 437
 438         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 439                         offset % sizeof(u64) != 0);
 440
 441         read_lock(&dev_base_lock);
 442         if (dev_isalive(dev)) {
 443                 struct rtnl_link_stats64 temp;
 444                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 445
 446                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
 447         }
 448         read_unlock(&dev_base_lock);
 449         return ret;
 450 }
 451
 452 /* generate a read-only statistics attribute */
 453 #define NETSTAT_ENTRY(name)                                             \
 454 static ssize_t name##_show(struct device *d,                            \
 455                            struct device_attribute *attr, char *buf)    \
 456 {                                                                       \
 457         return netstat_show(d, attr, buf,                               \
 458                             offsetof(struct rtnl_link_stats64, name));  \
 459 }                                                                       \
 460 static DEVICE_ATTR_RO(name)
 461
 462 NETSTAT_ENTRY(rx_packets);
 463 NETSTAT_ENTRY(tx_packets);
 464 NETSTAT_ENTRY(rx_bytes);
 465 NETSTAT_ENTRY(tx_bytes);
 466 NETSTAT_ENTRY(rx_errors);
 467 NETSTAT_ENTRY(tx_errors);
 468 NETSTAT_ENTRY(rx_dropped);
 469 NETSTAT_ENTRY(tx_dropped);
 470 NETSTAT_ENTRY(multicast);
 471 NETSTAT_ENTRY(collisions);
 472 NETSTAT_ENTRY(rx_length_errors);
 473 NETSTAT_ENTRY(rx_over_errors);
 474 NETSTAT_ENTRY(rx_crc_errors);
 475 NETSTAT_ENTRY(rx_frame_errors);
 476 NETSTAT_ENTRY(rx_fifo_errors);
 477 NETSTAT_ENTRY(rx_missed_errors);
 478 NETSTAT_ENTRY(tx_aborted_errors);
 479 NETSTAT_ENTRY(tx_carrier_errors);
 480 NETSTAT_ENTRY(tx_fifo_errors);
 481 NETSTAT_ENTRY(tx_heartbeat_errors);
 482 NETSTAT_ENTRY(tx_window_errors);
 483 NETSTAT_ENTRY(rx_compressed);
 484 NETSTAT_ENTRY(tx_compressed);
 485
 486 static struct attribute *netstat_attrs[] = {
 487         &dev_attr_rx_packets.attr,
 488         &dev_attr_tx_packets.attr,
 489         &dev_attr_rx_bytes.attr,
 490         &dev_attr_tx_bytes.attr,
 491         &dev_attr_rx_errors.attr,
 492         &dev_attr_tx_errors.attr,
 493         &dev_attr_rx_dropped.attr,
 494         &dev_attr_tx_dropped.attr,
 495         &dev_attr_multicast.attr,
 496         &dev_attr_collisions.attr,
 497         &dev_attr_rx_length_errors.attr,
 498         &dev_attr_rx_over_errors.attr,
 499         &dev_attr_rx_crc_errors.attr,
 500         &dev_attr_rx_frame_errors.attr,
 501         &dev_attr_rx_fifo_errors.attr,
 502         &dev_attr_rx_missed_errors.attr,
 503         &dev_attr_tx_aborted_errors.attr,
 504         &dev_attr_tx_carrier_errors.attr,
 505         &dev_attr_tx_fifo_errors.attr,
 506         &dev_attr_tx_heartbeat_errors.attr,
 507         &dev_attr_tx_window_errors.attr,
 508         &dev_attr_rx_compressed.attr,
 509         &dev_attr_tx_compressed.attr,
 510         NULL
 511 };
 512
 513
 514 static struct attribute_group netstat_group = {
 515         .name  = "statistics",
 516         .attrs  = netstat_attrs,
 517 };
 518
 519 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 520 static struct attribute *wireless_attrs[] = {
 521         NULL
 522 };
 523
 524 static struct attribute_group wireless_group = {
 525         .name = "wireless",
 526         .attrs = wireless_attrs,
 527 };
 528 #endif
 529
 530 #else /* CONFIG_SYSFS */
 531 #define net_class_groups        NULL
 532 #endif /* CONFIG_SYSFS */
 533
 534 #ifdef CONFIG_SYSFS
 535 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 536     struct rx_queue_attribute, attr)
 537
 538 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 539
 540 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 541                                   char *buf)
 542 {
 543         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 544         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 545
 546         if (!attribute->show)
 547                 return -EIO;
 548
 549         return attribute->show(queue, attribute, buf);
 550 }
 551
 552 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 553                                    const char *buf, size_t count)
 554 {
 555         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 556         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 557
 558         if (!attribute->store)
 559                 return -EIO;
 560
 561         return attribute->store(queue, attribute, buf, count);
 562 }
 563
 564 static const struct sysfs_ops rx_queue_sysfs_ops = {
 565         .show = rx_queue_attr_show,
 566         .store = rx_queue_attr_store,
 567 };
 568
 569 #ifdef CONFIG_RPS
 570 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 571                             struct rx_queue_attribute *attribute, char *buf)
 572 {
 573         struct rps_map *map;
 574         cpumask_var_t mask;
 575         size_t len = 0;
 576         int i;
 577
 578         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 579                 return -ENOMEM;
 580
 581         rcu_read_lock();
 582         map = rcu_dereference(queue->rps_map);
 583         if (map)
 584                 for (i = 0; i < map->len; i++)
 585                         cpumask_set_cpu(map->cpus[i], mask);
 586
 587         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 588         if (PAGE_SIZE - len < 3) {
 589                 rcu_read_unlock();
 590                 free_cpumask_var(mask);
 591                 return -EINVAL;
 592         }
 593         rcu_read_unlock();
 594
 595         free_cpumask_var(mask);
 596         len += sprintf(buf + len, "\n");
 597         return len;
 598 }
 599
 600 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 601                       struct rx_queue_attribute *attribute,
 602                       const char *buf, size_t len)
 603 {
 604         struct rps_map *old_map, *map;
 605         cpumask_var_t mask;
 606         int err, cpu, i;
 607         static DEFINE_SPINLOCK(rps_map_lock);
 608
 609         if (!capable(CAP_NET_ADMIN))
 610                 return -EPERM;
 611
 612         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 613                 return -ENOMEM;
 614
 615         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 616         if (err) {
 617                 free_cpumask_var(mask);
 618                 return err;
 619         }
 620
 621         map = kzalloc(max_t(unsigned int,
 622             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 623             GFP_KERNEL);
 624         if (!map) {
 625                 free_cpumask_var(mask);
 626                 return -ENOMEM;
 627         }
 628
 629         i = 0;
 630         for_each_cpu_and(cpu, mask, cpu_online_mask)
 631                 map->cpus[i++] = cpu;
 632
 633         if (i)
 634                 map->len = i;
 635         else {
 636                 kfree(map);
 637                 map = NULL;
 638         }
 639
 640         spin_lock(&rps_map_lock);
 641         old_map = rcu_dereference_protected(queue->rps_map,
 642                                             lockdep_is_held(&rps_map_lock));
 643         rcu_assign_pointer(queue->rps_map, map);
 644         spin_unlock(&rps_map_lock);
 645
 646         if (map)
 647                 static_key_slow_inc(&rps_needed);
 648         if (old_map) {
 649                 kfree_rcu(old_map, rcu);
 650                 static_key_slow_dec(&rps_needed);
 651         }
 652         free_cpumask_var(mask);
 653         return len;
 654 }
 655
 656 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 657                                            struct rx_queue_attribute *attr,
 658                                            char *buf)
 659 {
 660         struct rps_dev_flow_table *flow_table;
 661         unsigned long val = 0;
 662
 663         rcu_read_lock();
 664         flow_table = rcu_dereference(queue->rps_flow_table);
 665         if (flow_table)
 666                 val = (unsigned long)flow_table->mask + 1;
 667         rcu_read_unlock();
 668
 669         return sprintf(buf, "%lu\n", val);
 670 }
 671
 672 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 673 {
 674         struct rps_dev_flow_table *table = container_of(rcu,
 675             struct rps_dev_flow_table, rcu);
 676         vfree(table);
 677 }
 678
 679 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 680                                      struct rx_queue_attribute *attr,
 681                                      const char *buf, size_t len)
 682 {
 683         unsigned long mask, count;
 684         struct rps_dev_flow_table *table, *old_table;
 685         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 686         int rc;
 687
 688         if (!capable(CAP_NET_ADMIN))
 689                 return -EPERM;
 690
 691         rc = kstrtoul(buf, 0, &count);
 692         if (rc < 0)
 693                 return rc;
 694
 695         if (count) {
 696                 mask = count - 1;
 697                 /* mask = roundup_pow_of_two(count) - 1;
 698                  * without overflows...
 699                  */
 700                 while ((mask | (mask >> 1)) != mask)
 701                         mask |= (mask >> 1);
 702                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 703                  * and on 32bit arches, must check
 704                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 705                  */
 706 #if BITS_PER_LONG > 32
 707                 if (mask > (unsigned long)(u32)mask)
 708                         return -EINVAL;
 709 #else
 710                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 711                                 / sizeof(struct rps_dev_flow)) {
 712                         /* Enforce a limit to prevent overflow */
 713                         return -EINVAL;
 714                 }
 715 #endif
 716                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 717                 if (!table)
 718                         return -ENOMEM;
 719
 720                 table->mask = mask;
 721                 for (count = 0; count <= mask; count++)
 722                         table->flows[count].cpu = RPS_NO_CPU;
 723         } else
 724                 table = NULL;
 725
 726         spin_lock(&rps_dev_flow_lock);
 727         old_table = rcu_dereference_protected(queue->rps_flow_table,
 728                                               lockdep_is_held(&rps_dev_flow_lock));
 729         rcu_assign_pointer(queue->rps_flow_table, table);
 730         spin_unlock(&rps_dev_flow_lock);
 731
 732         if (old_table)
 733                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 734
 735         return len;
 736 }
 737
 738 static struct rx_queue_attribute rps_cpus_attribute =
 739         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 740
 741
 742 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 743         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 744             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 745 #endif /* CONFIG_RPS */
 746
 747 static struct attribute *rx_queue_default_attrs[] = {
 748 #ifdef CONFIG_RPS
 749         &rps_cpus_attribute.attr,
 750         &rps_dev_flow_table_cnt_attribute.attr,
 751 #endif
 752         NULL
 753 };
 754
 755 static void rx_queue_release(struct kobject *kobj)
 756 {
 757         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 758 #ifdef CONFIG_RPS
 759         struct rps_map *map;
 760         struct rps_dev_flow_table *flow_table;
 761
 762
 763         map = rcu_dereference_protected(queue->rps_map, 1);
 764         if (map) {
 765                 RCU_INIT_POINTER(queue->rps_map, NULL);
 766                 kfree_rcu(map, rcu);
 767         }
 768
 769         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 770         if (flow_table) {
 771                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 772                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 773         }
 774 #endif
 775
 776         memset(kobj, 0, sizeof(*kobj));
 777         dev_put(queue->dev);
 778 }
 779
 780 static const void *rx_queue_namespace(struct kobject *kobj)
 781 {
 782         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 783         struct device *dev = &queue->dev->dev;
 784         const void *ns = NULL;
 785
 786         if (dev->class && dev->class->ns_type)
 787                 ns = dev->class->namespace(dev);
 788
 789         return ns;
 790 }
 791
 792 static struct kobj_type rx_queue_ktype = {
 793         .sysfs_ops = &rx_queue_sysfs_ops,
 794         .release = rx_queue_release,
 795         .default_attrs = rx_queue_default_attrs,
 796         .namespace = rx_queue_namespace
 797 };
 798
 799 static int rx_queue_add_kobject(struct net_device *dev, int index)
 800 {
 801         struct netdev_rx_queue *queue = dev->_rx + index;
 802         struct kobject *kobj = &queue->kobj;
 803         int error = 0;
 804
 805         kobj->kset = dev->queues_kset;
 806         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 807             "rx-%u", index);
 808         if (error)
 809                 goto exit;
 810
 811         if (dev->sysfs_rx_queue_group) {
 812                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
 813                 if (error)
 814                         goto exit;
 815         }
 816
 817         kobject_uevent(kobj, KOBJ_ADD);
 818         dev_hold(queue->dev);
 819
 820         return error;
 821 exit:
 822         kobject_put(kobj);
 823         return error;
 824 }
 825 #endif /* CONFIG_SYSFS */
 826
 827 int
 828 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
 829 {
 830 #ifdef CONFIG_SYSFS
 831         int i;
 832         int error = 0;
 833
 834 #ifndef CONFIG_RPS
 835         if (!dev->sysfs_rx_queue_group)
 836                 return 0;
 837 #endif
 838         for (i = old_num; i < new_num; i++) {
 839                 error = rx_queue_add_kobject(dev, i);
 840                 if (error) {
 841                         new_num = old_num;
 842                         break;
 843                 }
 844         }
 845
 846         while (--i >= new_num) {
 847                 if (dev->sysfs_rx_queue_group)
 848                         sysfs_remove_group(&dev->_rx[i].kobj,
 849                                            dev->sysfs_rx_queue_group);
 850                 kobject_put(&dev->_rx[i].kobj);
 851         }
 852
 853         return error;
 854 #else
 855         return 0;
 856 #endif
 857 }
 858
 859 #ifdef CONFIG_SYSFS
 860 /*
 861  * netdev_queue sysfs structures and functions.
 862  */
 863 struct netdev_queue_attribute {
 864         struct attribute attr;
 865         ssize_t (*show)(struct netdev_queue *queue,
 866             struct netdev_queue_attribute *attr, char *buf);
 867         ssize_t (*store)(struct netdev_queue *queue,
 868             struct netdev_queue_attribute *attr, const char *buf, size_t len);
 869 };
 870 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
 871     struct netdev_queue_attribute, attr)
 872
 873 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 874
 875 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 876                                       struct attribute *attr, char *buf)
 877 {
 878         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 879         struct netdev_queue *queue = to_netdev_queue(kobj);
 880
 881         if (!attribute->show)
 882                 return -EIO;
 883
 884         return attribute->show(queue, attribute, buf);
 885 }
 886
 887 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 888                                        struct attribute *attr,
 889                                        const char *buf, size_t count)
 890 {
 891         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 892         struct netdev_queue *queue = to_netdev_queue(kobj);
 893
 894         if (!attribute->store)
 895                 return -EIO;
 896
 897         return attribute->store(queue, attribute, buf, count);
 898 }
 899
 900 static const struct sysfs_ops netdev_queue_sysfs_ops = {
 901         .show = netdev_queue_attr_show,
 902         .store = netdev_queue_attr_store,
 903 };
 904
 905 static ssize_t show_trans_timeout(struct netdev_queue *queue,
 906                                   struct netdev_queue_attribute *attribute,
 907                                   char *buf)
 908 {
 909         unsigned long trans_timeout;
 910
 911         spin_lock_irq(&queue->_xmit_lock);
 912         trans_timeout = queue->trans_timeout;
 913         spin_unlock_irq(&queue->_xmit_lock);
 914
 915         return sprintf(buf, "%lu", trans_timeout);
 916 }
 917
 918 static struct netdev_queue_attribute queue_trans_timeout =
 919         __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
 920
 921 #ifdef CONFIG_BQL
 922 /*
 923  * Byte queue limits sysfs structures and functions.
 924  */
 925 static ssize_t bql_show(char *buf, unsigned int value)
 926 {
 927         return sprintf(buf, "%u\n", value);
 928 }
 929
 930 static ssize_t bql_set(const char *buf, const size_t count,
 931                        unsigned int *pvalue)
 932 {
 933         unsigned int value;
 934         int err;
 935
 936         if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
 937                 value = DQL_MAX_LIMIT;
 938         else {
 939                 err = kstrtouint(buf, 10, &value);
 940                 if (err < 0)
 941                         return err;
 942                 if (value > DQL_MAX_LIMIT)
 943                         return -EINVAL;
 944         }
 945
 946         *pvalue = value;
 947
 948         return count;
 949 }
 950
 951 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
 952                                   struct netdev_queue_attribute *attr,
 953                                   char *buf)
 954 {
 955         struct dql *dql = &queue->dql;
 956
 957         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
 958 }
 959
 960 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
 961                                  struct netdev_queue_attribute *attribute,
 962                                  const char *buf, size_t len)
 963 {
 964         struct dql *dql = &queue->dql;
 965         unsigned int value;
 966         int err;
 967
 968         err = kstrtouint(buf, 10, &value);
 969         if (err < 0)
 970                 return err;
 971
 972         dql->slack_hold_time = msecs_to_jiffies(value);
 973
 974         return len;
 975 }
 976
 977 static struct netdev_queue_attribute bql_hold_time_attribute =
 978         __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
 979             bql_set_hold_time);
 980
 981 static ssize_t bql_show_inflight(struct netdev_queue *queue,
 982                                  struct netdev_queue_attribute *attr,
 983                                  char *buf)
 984 {
 985         struct dql *dql = &queue->dql;
 986
 987         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
 988 }
 989
 990 static struct netdev_queue_attribute bql_inflight_attribute =
 991         __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
 992
 993 #define BQL_ATTR(NAME, FIELD)                                           \
 994 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
 995                                  struct netdev_queue_attribute *attr,   \
 996                                  char *buf)                             \
 997 {                                                                       \
 998         return bql_show(buf, queue->dql.FIELD);                         \
 999 }                                                                       \
1000                                                                         \
1001 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1002                                 struct netdev_queue_attribute *attr,    \
1003                                 const char *buf, size_t len)            \
1004 {                                                                       \
1005         return bql_set(buf, len, &queue->dql.FIELD);                    \
1006 }                                                                       \
1007                                                                         \
1008 static struct netdev_queue_attribute bql_ ## NAME ## _attribute =       \
1009         __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME,              \
1010             bql_set_ ## NAME);
1011
1012 BQL_ATTR(limit, limit)
1013 BQL_ATTR(limit_max, max_limit)
1014 BQL_ATTR(limit_min, min_limit)
1015
1016 static struct attribute *dql_attrs[] = {
1017         &bql_limit_attribute.attr,
1018         &bql_limit_max_attribute.attr,
1019         &bql_limit_min_attribute.attr,
1020         &bql_hold_time_attribute.attr,
1021         &bql_inflight_attribute.attr,
1022         NULL
1023 };
1024
1025 static struct attribute_group dql_group = {
1026         .name  = "byte_queue_limits",
1027         .attrs  = dql_attrs,
1028 };
1029 #endif /* CONFIG_BQL */
1030
1031 #ifdef CONFIG_XPS
1032 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1033 {
1034         struct net_device *dev = queue->dev;
1035         unsigned int i;
1036
1037         i = queue - dev->_tx;
1038         BUG_ON(i >= dev->num_tx_queues);
1039
1040         return i;
1041 }
1042
1043
1044 static ssize_t show_xps_map(struct netdev_queue *queue,
1045                             struct netdev_queue_attribute *attribute, char *buf)
1046 {
1047         struct net_device *dev = queue->dev;
1048         struct xps_dev_maps *dev_maps;
1049         cpumask_var_t mask;
1050         unsigned long index;
1051         size_t len = 0;
1052         int i;
1053
1054         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1055                 return -ENOMEM;
1056
1057         index = get_netdev_queue_index(queue);
1058
1059         rcu_read_lock();
1060         dev_maps = rcu_dereference(dev->xps_maps);
1061         if (dev_maps) {
1062                 for_each_possible_cpu(i) {
1063                         struct xps_map *map =
1064                             rcu_dereference(dev_maps->cpu_map[i]);
1065                         if (map) {
1066                                 int j;
1067                                 for (j = 0; j < map->len; j++) {
1068                                         if (map->queues[j] == index) {
1069                                                 cpumask_set_cpu(i, mask);
1070                                                 break;
1071                                         }
1072                                 }
1073                         }
1074                 }
1075         }
1076         rcu_read_unlock();
1077
1078         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
1079         if (PAGE_SIZE - len < 3) {
1080                 free_cpumask_var(mask);
1081                 return -EINVAL;
1082         }
1083
1084         free_cpumask_var(mask);
1085         len += sprintf(buf + len, "\n");
1086         return len;
1087 }
1088
1089 static ssize_t store_xps_map(struct netdev_queue *queue,
1090                       struct netdev_queue_attribute *attribute,
1091                       const char *buf, size_t len)
1092 {
1093         struct net_device *dev = queue->dev;
1094         unsigned long index;
1095         cpumask_var_t mask;
1096         int err;
1097
1098         if (!capable(CAP_NET_ADMIN))
1099                 return -EPERM;
1100
1101         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1102                 return -ENOMEM;
1103
1104         index = get_netdev_queue_index(queue);
1105
1106         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1107         if (err) {
1108                 free_cpumask_var(mask);
1109                 return err;
1110         }
1111
1112         err = netif_set_xps_queue(dev, mask, index);
1113
1114         free_cpumask_var(mask);
1115
1116         return err ? : len;
1117 }
1118
1119 static struct netdev_queue_attribute xps_cpus_attribute =
1120     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1121 #endif /* CONFIG_XPS */
1122
1123 static struct attribute *netdev_queue_default_attrs[] = {
1124         &queue_trans_timeout.attr,
1125 #ifdef CONFIG_XPS
1126         &xps_cpus_attribute.attr,
1127 #endif
1128         NULL
1129 };
1130
1131 static void netdev_queue_release(struct kobject *kobj)
1132 {
1133         struct netdev_queue *queue = to_netdev_queue(kobj);
1134
1135         memset(kobj, 0, sizeof(*kobj));
1136         dev_put(queue->dev);
1137 }
1138
1139 static const void *netdev_queue_namespace(struct kobject *kobj)
1140 {
1141         struct netdev_queue *queue = to_netdev_queue(kobj);
1142         struct device *dev = &queue->dev->dev;
1143         const void *ns = NULL;
1144
1145         if (dev->class && dev->class->ns_type)
1146                 ns = dev->class->namespace(dev);
1147
1148         return ns;
1149 }
1150
1151 static struct kobj_type netdev_queue_ktype = {
1152         .sysfs_ops = &netdev_queue_sysfs_ops,
1153         .release = netdev_queue_release,
1154         .default_attrs = netdev_queue_default_attrs,
1155         .namespace = netdev_queue_namespace,
1156 };
1157
1158 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1159 {
1160         struct netdev_queue *queue = dev->_tx + index;
1161         struct kobject *kobj = &queue->kobj;
1162         int error = 0;
1163
1164         kobj->kset = dev->queues_kset;
1165         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1166             "tx-%u", index);
1167         if (error)
1168                 goto exit;
1169
1170 #ifdef CONFIG_BQL
1171         error = sysfs_create_group(kobj, &dql_group);
1172         if (error)
1173                 goto exit;
1174 #endif
1175
1176         kobject_uevent(kobj, KOBJ_ADD);
1177         dev_hold(queue->dev);
1178
1179         return 0;
1180 exit:
1181         kobject_put(kobj);
1182         return error;
1183 }
1184 #endif /* CONFIG_SYSFS */
1185
1186 int
1187 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1188 {
1189 #ifdef CONFIG_SYSFS
1190         int i;
1191         int error = 0;
1192
1193         for (i = old_num; i < new_num; i++) {
1194                 error = netdev_queue_add_kobject(dev, i);
1195                 if (error) {
1196                         new_num = old_num;
1197                         break;
1198                 }
1199         }
1200
1201         while (--i >= new_num) {
1202                 struct netdev_queue *queue = dev->_tx + i;
1203
1204 #ifdef CONFIG_BQL
1205                 sysfs_remove_group(&queue->kobj, &dql_group);
1206 #endif
1207                 kobject_put(&queue->kobj);
1208         }
1209
1210         return error;
1211 #else
1212         return 0;
1213 #endif /* CONFIG_SYSFS */
1214 }
1215
1216 static int register_queue_kobjects(struct net_device *dev)
1217 {
1218         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1219
1220 #ifdef CONFIG_SYSFS
1221         dev->queues_kset = kset_create_and_add("queues",
1222             NULL, &dev->dev.kobj);
1223         if (!dev->queues_kset)
1224                 return -ENOMEM;
1225         real_rx = dev->real_num_rx_queues;
1226 #endif
1227         real_tx = dev->real_num_tx_queues;
1228
1229         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1230         if (error)
1231                 goto error;
1232         rxq = real_rx;
1233
1234         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1235         if (error)
1236                 goto error;
1237         txq = real_tx;
1238
1239         return 0;
1240
1241 error:
1242         netdev_queue_update_kobjects(dev, txq, 0);
1243         net_rx_queue_update_kobjects(dev, rxq, 0);
1244         return error;
1245 }
1246
1247 static void remove_queue_kobjects(struct net_device *dev)
1248 {
1249         int real_rx = 0, real_tx = 0;
1250
1251 #ifdef CONFIG_SYSFS
1252         real_rx = dev->real_num_rx_queues;
1253 #endif
1254         real_tx = dev->real_num_tx_queues;
1255
1256         net_rx_queue_update_kobjects(dev, real_rx, 0);
1257         netdev_queue_update_kobjects(dev, real_tx, 0);
1258 #ifdef CONFIG_SYSFS
1259         kset_unregister(dev->queues_kset);
1260 #endif
1261 }
1262
1263 static bool net_current_may_mount(void)
1264 {
1265         struct net *net = current->nsproxy->net_ns;
1266
1267         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1268 }
1269
1270 static void *net_grab_current_ns(void)
1271 {
1272         struct net *ns = current->nsproxy->net_ns;
1273 #ifdef CONFIG_NET_NS
1274         if (ns)
1275                 atomic_inc(&ns->passive);
1276 #endif
1277         return ns;
1278 }
1279
1280 static const void *net_initial_ns(void)
1281 {
1282         return &init_net;
1283 }
1284
1285 static const void *net_netlink_ns(struct sock *sk)
1286 {
1287         return sock_net(sk);
1288 }
1289
1290 struct kobj_ns_type_operations net_ns_type_operations = {
1291         .type = KOBJ_NS_TYPE_NET,
1292         .current_may_mount = net_current_may_mount,
1293         .grab_current_ns = net_grab_current_ns,
1294         .netlink_ns = net_netlink_ns,
1295         .initial_ns = net_initial_ns,
1296         .drop_ns = net_drop_ns,
1297 };
1298 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1299
1300 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1301 {
1302         struct net_device *dev = to_net_dev(d);
1303         int retval;
1304
1305         /* pass interface to uevent. */
1306         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1307         if (retval)
1308                 goto exit;
1309
1310         /* pass ifindex to uevent.
1311          * ifindex is useful as it won't change (interface name may change)
1312          * and is what RtNetlink uses natively. */
1313         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1314
1315 exit:
1316         return retval;
1317 }
1318
1319 /*
1320  *      netdev_release -- destroy and free a dead device.
1321  *      Called when last reference to device kobject is gone.
1322  */
1323 static void netdev_release(struct device *d)
1324 {
1325         struct net_device *dev = to_net_dev(d);
1326
1327         BUG_ON(dev->reg_state != NETREG_RELEASED);
1328
1329         kfree(dev->ifalias);
1330         netdev_freemem(dev);
1331 }
1332
1333 static const void *net_namespace(struct device *d)
1334 {
1335         struct net_device *dev;
1336         dev = container_of(d, struct net_device, dev);
1337         return dev_net(dev);
1338 }
1339
1340 static struct class net_class = {
1341         .name = "net",
1342         .dev_release = netdev_release,
1343         .dev_groups = net_class_groups,
1344         .dev_uevent = netdev_uevent,
1345         .ns_type = &net_ns_type_operations,
1346         .namespace = net_namespace,
1347 };
1348
1349 /* Delete sysfs entries but hold kobject reference until after all
1350  * netdev references are gone.
1351  */
1352 void netdev_unregister_kobject(struct net_device *ndev)
1353 {
1354         struct device *dev = &(ndev->dev);
1355
1356         kobject_get(&dev->kobj);
1357
1358         remove_queue_kobjects(ndev);
1359
1360         pm_runtime_set_memalloc_noio(dev, false);
1361
1362         device_del(dev);
1363 }
1364
1365 /* Create sysfs entries for network device. */
1366 int netdev_register_kobject(struct net_device *ndev)
1367 {
1368         struct device *dev = &(ndev->dev);
1369         const struct attribute_group **groups = ndev->sysfs_groups;
1370         int error = 0;
1371
1372         device_initialize(dev);
1373         dev->class = &net_class;
1374         dev->platform_data = ndev;
1375         dev->groups = groups;
1376
1377         dev_set_name(dev, "%s", ndev->name);
1378
1379 #ifdef CONFIG_SYSFS
1380         /* Allow for a device specific group */
1381         if (*groups)
1382                 groups++;
1383
1384         *groups++ = &netstat_group;
1385
1386 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1387         if (ndev->ieee80211_ptr)
1388                 *groups++ = &wireless_group;
1389 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1390         else if (ndev->wireless_handlers)
1391                 *groups++ = &wireless_group;
1392 #endif
1393 #endif
1394 #endif /* CONFIG_SYSFS */
1395
1396         error = device_add(dev);
1397         if (error)
1398                 return error;
1399
1400         error = register_queue_kobjects(ndev);
1401         if (error) {
1402                 device_del(dev);
1403                 return error;
1404         }
1405
1406         pm_runtime_set_memalloc_noio(dev, true);
1407
1408         return error;
1409 }
1410
1411 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1412                                 const void *ns)
1413 {
1414         return class_create_file_ns(&net_class, class_attr, ns);
1415 }
1416 EXPORT_SYMBOL(netdev_class_create_file_ns);
1417
1418 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1419                                  const void *ns)
1420 {
1421         class_remove_file_ns(&net_class, class_attr, ns);
1422 }
1423 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1424
1425 int __init netdev_kobject_init(void)
1426 {
1427         kobj_ns_type_register(&net_ns_type_operations);
1428         return class_register(&net_class);
1429 }