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