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 int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 329 {
 330         dev->gro_flush_timeout = val;
 331         return 0;
 332 }
 333
 334 static ssize_t gro_flush_timeout_store(struct device *dev,
 335                                   struct device_attribute *attr,
 336                                   const char *buf, size_t len)
 337 {
 338         if (!capable(CAP_NET_ADMIN))
 339                 return -EPERM;
 340
 341         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 342 }
 343 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 344
 345 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 346                              const char *buf, size_t len)
 347 {
 348         struct net_device *netdev = to_net_dev(dev);
 349         struct net *net = dev_net(netdev);
 350         size_t count = len;
 351         ssize_t ret;
 352
 353         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 354                 return -EPERM;
 355
 356         /* ignore trailing newline */
 357         if (len >  0 && buf[len - 1] == '\n')
 358                 --count;
 359
 360         if (!rtnl_trylock())
 361                 return restart_syscall();
 362         ret = dev_set_alias(netdev, buf, count);
 363         rtnl_unlock();
 364
 365         return ret < 0 ? ret : len;
 366 }
 367
 368 static ssize_t ifalias_show(struct device *dev,
 369                             struct device_attribute *attr, char *buf)
 370 {
 371         const struct net_device *netdev = to_net_dev(dev);
 372         ssize_t ret = 0;
 373
 374         if (!rtnl_trylock())
 375                 return restart_syscall();
 376         if (netdev->ifalias)
 377                 ret = sprintf(buf, "%s\n", netdev->ifalias);
 378         rtnl_unlock();
 379         return ret;
 380 }
 381 static DEVICE_ATTR_RW(ifalias);
 382
 383 static int change_group(struct net_device *dev, unsigned long new_group)
 384 {
 385         dev_set_group(dev, (int) new_group);
 386         return 0;
 387 }
 388
 389 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 390                            const char *buf, size_t len)
 391 {
 392         return netdev_store(dev, attr, buf, len, change_group);
 393 }
 394 NETDEVICE_SHOW(group, fmt_dec);
 395 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
 396
 397 static ssize_t phys_port_id_show(struct device *dev,
 398                                  struct device_attribute *attr, char *buf)
 399 {
 400         struct net_device *netdev = to_net_dev(dev);
 401         ssize_t ret = -EINVAL;
 402
 403         if (!rtnl_trylock())
 404                 return restart_syscall();
 405
 406         if (dev_isalive(netdev)) {
 407                 struct netdev_phys_item_id ppid;
 408
 409                 ret = dev_get_phys_port_id(netdev, &ppid);
 410                 if (!ret)
 411                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 412         }
 413         rtnl_unlock();
 414
 415         return ret;
 416 }
 417 static DEVICE_ATTR_RO(phys_port_id);
 418
 419 static struct attribute *net_class_attrs[] = {
 420         &dev_attr_netdev_group.attr,
 421         &dev_attr_type.attr,
 422         &dev_attr_dev_id.attr,
 423         &dev_attr_dev_port.attr,
 424         &dev_attr_iflink.attr,
 425         &dev_attr_ifindex.attr,
 426         &dev_attr_name_assign_type.attr,
 427         &dev_attr_addr_assign_type.attr,
 428         &dev_attr_addr_len.attr,
 429         &dev_attr_link_mode.attr,
 430         &dev_attr_address.attr,
 431         &dev_attr_broadcast.attr,
 432         &dev_attr_speed.attr,
 433         &dev_attr_duplex.attr,
 434         &dev_attr_dormant.attr,
 435         &dev_attr_operstate.attr,
 436         &dev_attr_carrier_changes.attr,
 437         &dev_attr_ifalias.attr,
 438         &dev_attr_carrier.attr,
 439         &dev_attr_mtu.attr,
 440         &dev_attr_flags.attr,
 441         &dev_attr_tx_queue_len.attr,
 442         &dev_attr_gro_flush_timeout.attr,
 443         &dev_attr_phys_port_id.attr,
 444         NULL,
 445 };
 446 ATTRIBUTE_GROUPS(net_class);
 447
 448 /* Show a given an attribute in the statistics group */
 449 static ssize_t netstat_show(const struct device *d,
 450                             struct device_attribute *attr, char *buf,
 451                             unsigned long offset)
 452 {
 453         struct net_device *dev = to_net_dev(d);
 454         ssize_t ret = -EINVAL;
 455
 456         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 457                         offset % sizeof(u64) != 0);
 458
 459         read_lock(&dev_base_lock);
 460         if (dev_isalive(dev)) {
 461                 struct rtnl_link_stats64 temp;
 462                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 463
 464                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
 465         }
 466         read_unlock(&dev_base_lock);
 467         return ret;
 468 }
 469
 470 /* generate a read-only statistics attribute */
 471 #define NETSTAT_ENTRY(name)                                             \
 472 static ssize_t name##_show(struct device *d,                            \
 473                            struct device_attribute *attr, char *buf)    \
 474 {                                                                       \
 475         return netstat_show(d, attr, buf,                               \
 476                             offsetof(struct rtnl_link_stats64, name));  \
 477 }                                                                       \
 478 static DEVICE_ATTR_RO(name)
 479
 480 NETSTAT_ENTRY(rx_packets);
 481 NETSTAT_ENTRY(tx_packets);
 482 NETSTAT_ENTRY(rx_bytes);
 483 NETSTAT_ENTRY(tx_bytes);
 484 NETSTAT_ENTRY(rx_errors);
 485 NETSTAT_ENTRY(tx_errors);
 486 NETSTAT_ENTRY(rx_dropped);
 487 NETSTAT_ENTRY(tx_dropped);
 488 NETSTAT_ENTRY(multicast);
 489 NETSTAT_ENTRY(collisions);
 490 NETSTAT_ENTRY(rx_length_errors);
 491 NETSTAT_ENTRY(rx_over_errors);
 492 NETSTAT_ENTRY(rx_crc_errors);
 493 NETSTAT_ENTRY(rx_frame_errors);
 494 NETSTAT_ENTRY(rx_fifo_errors);
 495 NETSTAT_ENTRY(rx_missed_errors);
 496 NETSTAT_ENTRY(tx_aborted_errors);
 497 NETSTAT_ENTRY(tx_carrier_errors);
 498 NETSTAT_ENTRY(tx_fifo_errors);
 499 NETSTAT_ENTRY(tx_heartbeat_errors);
 500 NETSTAT_ENTRY(tx_window_errors);
 501 NETSTAT_ENTRY(rx_compressed);
 502 NETSTAT_ENTRY(tx_compressed);
 503
 504 static struct attribute *netstat_attrs[] = {
 505         &dev_attr_rx_packets.attr,
 506         &dev_attr_tx_packets.attr,
 507         &dev_attr_rx_bytes.attr,
 508         &dev_attr_tx_bytes.attr,
 509         &dev_attr_rx_errors.attr,
 510         &dev_attr_tx_errors.attr,
 511         &dev_attr_rx_dropped.attr,
 512         &dev_attr_tx_dropped.attr,
 513         &dev_attr_multicast.attr,
 514         &dev_attr_collisions.attr,
 515         &dev_attr_rx_length_errors.attr,
 516         &dev_attr_rx_over_errors.attr,
 517         &dev_attr_rx_crc_errors.attr,
 518         &dev_attr_rx_frame_errors.attr,
 519         &dev_attr_rx_fifo_errors.attr,
 520         &dev_attr_rx_missed_errors.attr,
 521         &dev_attr_tx_aborted_errors.attr,
 522         &dev_attr_tx_carrier_errors.attr,
 523         &dev_attr_tx_fifo_errors.attr,
 524         &dev_attr_tx_heartbeat_errors.attr,
 525         &dev_attr_tx_window_errors.attr,
 526         &dev_attr_rx_compressed.attr,
 527         &dev_attr_tx_compressed.attr,
 528         NULL
 529 };
 530
 531
 532 static struct attribute_group netstat_group = {
 533         .name  = "statistics",
 534         .attrs  = netstat_attrs,
 535 };
 536
 537 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 538 static struct attribute *wireless_attrs[] = {
 539         NULL
 540 };
 541
 542 static struct attribute_group wireless_group = {
 543         .name = "wireless",
 544         .attrs = wireless_attrs,
 545 };
 546 #endif
 547
 548 #else /* CONFIG_SYSFS */
 549 #define net_class_groups        NULL
 550 #endif /* CONFIG_SYSFS */
 551
 552 #ifdef CONFIG_SYSFS
 553 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 554     struct rx_queue_attribute, attr)
 555
 556 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 557
 558 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 559                                   char *buf)
 560 {
 561         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 562         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 563
 564         if (!attribute->show)
 565                 return -EIO;
 566
 567         return attribute->show(queue, attribute, buf);
 568 }
 569
 570 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 571                                    const char *buf, size_t count)
 572 {
 573         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 574         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 575
 576         if (!attribute->store)
 577                 return -EIO;
 578
 579         return attribute->store(queue, attribute, buf, count);
 580 }
 581
 582 static const struct sysfs_ops rx_queue_sysfs_ops = {
 583         .show = rx_queue_attr_show,
 584         .store = rx_queue_attr_store,
 585 };
 586
 587 #ifdef CONFIG_RPS
 588 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 589                             struct rx_queue_attribute *attribute, char *buf)
 590 {
 591         struct rps_map *map;
 592         cpumask_var_t mask;
 593         size_t len = 0;
 594         int i;
 595
 596         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 597                 return -ENOMEM;
 598
 599         rcu_read_lock();
 600         map = rcu_dereference(queue->rps_map);
 601         if (map)
 602                 for (i = 0; i < map->len; i++)
 603                         cpumask_set_cpu(map->cpus[i], mask);
 604
 605         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 606         if (PAGE_SIZE - len < 3) {
 607                 rcu_read_unlock();
 608                 free_cpumask_var(mask);
 609                 return -EINVAL;
 610         }
 611         rcu_read_unlock();
 612
 613         free_cpumask_var(mask);
 614         len += sprintf(buf + len, "\n");
 615         return len;
 616 }
 617
 618 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 619                       struct rx_queue_attribute *attribute,
 620                       const char *buf, size_t len)
 621 {
 622         struct rps_map *old_map, *map;
 623         cpumask_var_t mask;
 624         int err, cpu, i;
 625         static DEFINE_SPINLOCK(rps_map_lock);
 626
 627         if (!capable(CAP_NET_ADMIN))
 628                 return -EPERM;
 629
 630         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 631                 return -ENOMEM;
 632
 633         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 634         if (err) {
 635                 free_cpumask_var(mask);
 636                 return err;
 637         }
 638
 639         map = kzalloc(max_t(unsigned int,
 640             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 641             GFP_KERNEL);
 642         if (!map) {
 643                 free_cpumask_var(mask);
 644                 return -ENOMEM;
 645         }
 646
 647         i = 0;
 648         for_each_cpu_and(cpu, mask, cpu_online_mask)
 649                 map->cpus[i++] = cpu;
 650
 651         if (i)
 652                 map->len = i;
 653         else {
 654                 kfree(map);
 655                 map = NULL;
 656         }
 657
 658         spin_lock(&rps_map_lock);
 659         old_map = rcu_dereference_protected(queue->rps_map,
 660                                             lockdep_is_held(&rps_map_lock));
 661         rcu_assign_pointer(queue->rps_map, map);
 662         spin_unlock(&rps_map_lock);
 663
 664         if (map)
 665                 static_key_slow_inc(&rps_needed);
 666         if (old_map) {
 667                 kfree_rcu(old_map, rcu);
 668                 static_key_slow_dec(&rps_needed);
 669         }
 670         free_cpumask_var(mask);
 671         return len;
 672 }
 673
 674 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 675                                            struct rx_queue_attribute *attr,
 676                                            char *buf)
 677 {
 678         struct rps_dev_flow_table *flow_table;
 679         unsigned long val = 0;
 680
 681         rcu_read_lock();
 682         flow_table = rcu_dereference(queue->rps_flow_table);
 683         if (flow_table)
 684                 val = (unsigned long)flow_table->mask + 1;
 685         rcu_read_unlock();
 686
 687         return sprintf(buf, "%lu\n", val);
 688 }
 689
 690 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 691 {
 692         struct rps_dev_flow_table *table = container_of(rcu,
 693             struct rps_dev_flow_table, rcu);
 694         vfree(table);
 695 }
 696
 697 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 698                                      struct rx_queue_attribute *attr,
 699                                      const char *buf, size_t len)
 700 {
 701         unsigned long mask, count;
 702         struct rps_dev_flow_table *table, *old_table;
 703         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 704         int rc;
 705
 706         if (!capable(CAP_NET_ADMIN))
 707                 return -EPERM;
 708
 709         rc = kstrtoul(buf, 0, &count);
 710         if (rc < 0)
 711                 return rc;
 712
 713         if (count) {
 714                 mask = count - 1;
 715                 /* mask = roundup_pow_of_two(count) - 1;
 716                  * without overflows...
 717                  */
 718                 while ((mask | (mask >> 1)) != mask)
 719                         mask |= (mask >> 1);
 720                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 721                  * and on 32bit arches, must check
 722                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 723                  */
 724 #if BITS_PER_LONG > 32
 725                 if (mask > (unsigned long)(u32)mask)
 726                         return -EINVAL;
 727 #else
 728                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 729                                 / sizeof(struct rps_dev_flow)) {
 730                         /* Enforce a limit to prevent overflow */
 731                         return -EINVAL;
 732                 }
 733 #endif
 734                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 735                 if (!table)
 736                         return -ENOMEM;
 737
 738                 table->mask = mask;
 739                 for (count = 0; count <= mask; count++)
 740                         table->flows[count].cpu = RPS_NO_CPU;
 741         } else
 742                 table = NULL;
 743
 744         spin_lock(&rps_dev_flow_lock);
 745         old_table = rcu_dereference_protected(queue->rps_flow_table,
 746                                               lockdep_is_held(&rps_dev_flow_lock));
 747         rcu_assign_pointer(queue->rps_flow_table, table);
 748         spin_unlock(&rps_dev_flow_lock);
 749
 750         if (old_table)
 751                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 752
 753         return len;
 754 }
 755
 756 static struct rx_queue_attribute rps_cpus_attribute =
 757         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 758
 759
 760 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 761         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 762             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 763 #endif /* CONFIG_RPS */
 764
 765 static struct attribute *rx_queue_default_attrs[] = {
 766 #ifdef CONFIG_RPS
 767         &rps_cpus_attribute.attr,
 768         &rps_dev_flow_table_cnt_attribute.attr,
 769 #endif
 770         NULL
 771 };
 772
 773 static void rx_queue_release(struct kobject *kobj)
 774 {
 775         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 776 #ifdef CONFIG_RPS
 777         struct rps_map *map;
 778         struct rps_dev_flow_table *flow_table;
 779
 780
 781         map = rcu_dereference_protected(queue->rps_map, 1);
 782         if (map) {
 783                 RCU_INIT_POINTER(queue->rps_map, NULL);
 784                 kfree_rcu(map, rcu);
 785         }
 786
 787         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 788         if (flow_table) {
 789                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 790                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 791         }
 792 #endif
 793
 794         memset(kobj, 0, sizeof(*kobj));
 795         dev_put(queue->dev);
 796 }
 797
 798 static const void *rx_queue_namespace(struct kobject *kobj)
 799 {
 800         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 801         struct device *dev = &queue->dev->dev;
 802         const void *ns = NULL;
 803
 804         if (dev->class && dev->class->ns_type)
 805                 ns = dev->class->namespace(dev);
 806
 807         return ns;
 808 }
 809
 810 static struct kobj_type rx_queue_ktype = {
 811         .sysfs_ops = &rx_queue_sysfs_ops,
 812         .release = rx_queue_release,
 813         .default_attrs = rx_queue_default_attrs,
 814         .namespace = rx_queue_namespace
 815 };
 816
 817 static int rx_queue_add_kobject(struct net_device *dev, int index)
 818 {
 819         struct netdev_rx_queue *queue = dev->_rx + index;
 820         struct kobject *kobj = &queue->kobj;
 821         int error = 0;
 822
 823         kobj->kset = dev->queues_kset;
 824         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 825             "rx-%u", index);
 826         if (error)
 827                 goto exit;
 828
 829         if (dev->sysfs_rx_queue_group) {
 830                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
 831                 if (error)
 832                         goto exit;
 833         }
 834
 835         kobject_uevent(kobj, KOBJ_ADD);
 836         dev_hold(queue->dev);
 837
 838         return error;
 839 exit:
 840         kobject_put(kobj);
 841         return error;
 842 }
 843 #endif /* CONFIG_SYSFS */
 844
 845 int
 846 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
 847 {
 848 #ifdef CONFIG_SYSFS
 849         int i;
 850         int error = 0;
 851
 852 #ifndef CONFIG_RPS
 853         if (!dev->sysfs_rx_queue_group)
 854                 return 0;
 855 #endif
 856         for (i = old_num; i < new_num; i++) {
 857                 error = rx_queue_add_kobject(dev, i);
 858                 if (error) {
 859                         new_num = old_num;
 860                         break;
 861                 }
 862         }
 863
 864         while (--i >= new_num) {
 865                 if (dev->sysfs_rx_queue_group)
 866                         sysfs_remove_group(&dev->_rx[i].kobj,
 867                                            dev->sysfs_rx_queue_group);
 868                 kobject_put(&dev->_rx[i].kobj);
 869         }
 870
 871         return error;
 872 #else
 873         return 0;
 874 #endif
 875 }
 876
 877 #ifdef CONFIG_SYSFS
 878 /*
 879  * netdev_queue sysfs structures and functions.
 880  */
 881 struct netdev_queue_attribute {
 882         struct attribute attr;
 883         ssize_t (*show)(struct netdev_queue *queue,
 884             struct netdev_queue_attribute *attr, char *buf);
 885         ssize_t (*store)(struct netdev_queue *queue,
 886             struct netdev_queue_attribute *attr, const char *buf, size_t len);
 887 };
 888 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
 889     struct netdev_queue_attribute, attr)
 890
 891 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 892
 893 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 894                                       struct attribute *attr, char *buf)
 895 {
 896         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 897         struct netdev_queue *queue = to_netdev_queue(kobj);
 898
 899         if (!attribute->show)
 900                 return -EIO;
 901
 902         return attribute->show(queue, attribute, buf);
 903 }
 904
 905 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 906                                        struct attribute *attr,
 907                                        const char *buf, size_t count)
 908 {
 909         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 910         struct netdev_queue *queue = to_netdev_queue(kobj);
 911
 912         if (!attribute->store)
 913                 return -EIO;
 914
 915         return attribute->store(queue, attribute, buf, count);
 916 }
 917
 918 static const struct sysfs_ops netdev_queue_sysfs_ops = {
 919         .show = netdev_queue_attr_show,
 920         .store = netdev_queue_attr_store,
 921 };
 922
 923 static ssize_t show_trans_timeout(struct netdev_queue *queue,
 924                                   struct netdev_queue_attribute *attribute,
 925                                   char *buf)
 926 {
 927         unsigned long trans_timeout;
 928
 929         spin_lock_irq(&queue->_xmit_lock);
 930         trans_timeout = queue->trans_timeout;
 931         spin_unlock_irq(&queue->_xmit_lock);
 932
 933         return sprintf(buf, "%lu", trans_timeout);
 934 }
 935
 936 static struct netdev_queue_attribute queue_trans_timeout =
 937         __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
 938
 939 #ifdef CONFIG_BQL
 940 /*
 941  * Byte queue limits sysfs structures and functions.
 942  */
 943 static ssize_t bql_show(char *buf, unsigned int value)
 944 {
 945         return sprintf(buf, "%u\n", value);
 946 }
 947
 948 static ssize_t bql_set(const char *buf, const size_t count,
 949                        unsigned int *pvalue)
 950 {
 951         unsigned int value;
 952         int err;
 953
 954         if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
 955                 value = DQL_MAX_LIMIT;
 956         else {
 957                 err = kstrtouint(buf, 10, &value);
 958                 if (err < 0)
 959                         return err;
 960                 if (value > DQL_MAX_LIMIT)
 961                         return -EINVAL;
 962         }
 963
 964         *pvalue = value;
 965
 966         return count;
 967 }
 968
 969 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
 970                                   struct netdev_queue_attribute *attr,
 971                                   char *buf)
 972 {
 973         struct dql *dql = &queue->dql;
 974
 975         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
 976 }
 977
 978 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
 979                                  struct netdev_queue_attribute *attribute,
 980                                  const char *buf, size_t len)
 981 {
 982         struct dql *dql = &queue->dql;
 983         unsigned int value;
 984         int err;
 985
 986         err = kstrtouint(buf, 10, &value);
 987         if (err < 0)
 988                 return err;
 989
 990         dql->slack_hold_time = msecs_to_jiffies(value);
 991
 992         return len;
 993 }
 994
 995 static struct netdev_queue_attribute bql_hold_time_attribute =
 996         __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
 997             bql_set_hold_time);
 998
 999 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1000                                  struct netdev_queue_attribute *attr,
1001                                  char *buf)
1002 {
1003         struct dql *dql = &queue->dql;
1004
1005         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1006 }
1007
1008 static struct netdev_queue_attribute bql_inflight_attribute =
1009         __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1010
1011 #define BQL_ATTR(NAME, FIELD)                                           \
1012 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1013                                  struct netdev_queue_attribute *attr,   \
1014                                  char *buf)                             \
1015 {                                                                       \
1016         return bql_show(buf, queue->dql.FIELD);                         \
1017 }                                                                       \
1018                                                                         \
1019 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1020                                 struct netdev_queue_attribute *attr,    \
1021                                 const char *buf, size_t len)            \
1022 {                                                                       \
1023         return bql_set(buf, len, &queue->dql.FIELD);                    \
1024 }                                                                       \
1025                                                                         \
1026 static struct netdev_queue_attribute bql_ ## NAME ## _attribute =       \
1027         __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME,              \
1028             bql_set_ ## NAME);
1029
1030 BQL_ATTR(limit, limit)
1031 BQL_ATTR(limit_max, max_limit)
1032 BQL_ATTR(limit_min, min_limit)
1033
1034 static struct attribute *dql_attrs[] = {
1035         &bql_limit_attribute.attr,
1036         &bql_limit_max_attribute.attr,
1037         &bql_limit_min_attribute.attr,
1038         &bql_hold_time_attribute.attr,
1039         &bql_inflight_attribute.attr,
1040         NULL
1041 };
1042
1043 static struct attribute_group dql_group = {
1044         .name  = "byte_queue_limits",
1045         .attrs  = dql_attrs,
1046 };
1047 #endif /* CONFIG_BQL */
1048
1049 #ifdef CONFIG_XPS
1050 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1051 {
1052         struct net_device *dev = queue->dev;
1053         unsigned int i;
1054
1055         i = queue - dev->_tx;
1056         BUG_ON(i >= dev->num_tx_queues);
1057
1058         return i;
1059 }
1060
1061
1062 static ssize_t show_xps_map(struct netdev_queue *queue,
1063                             struct netdev_queue_attribute *attribute, char *buf)
1064 {
1065         struct net_device *dev = queue->dev;
1066         struct xps_dev_maps *dev_maps;
1067         cpumask_var_t mask;
1068         unsigned long index;
1069         size_t len = 0;
1070         int i;
1071
1072         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1073                 return -ENOMEM;
1074
1075         index = get_netdev_queue_index(queue);
1076
1077         rcu_read_lock();
1078         dev_maps = rcu_dereference(dev->xps_maps);
1079         if (dev_maps) {
1080                 for_each_possible_cpu(i) {
1081                         struct xps_map *map =
1082                             rcu_dereference(dev_maps->cpu_map[i]);
1083                         if (map) {
1084                                 int j;
1085                                 for (j = 0; j < map->len; j++) {
1086                                         if (map->queues[j] == index) {
1087                                                 cpumask_set_cpu(i, mask);
1088                                                 break;
1089                                         }
1090                                 }
1091                         }
1092                 }
1093         }
1094         rcu_read_unlock();
1095
1096         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
1097         if (PAGE_SIZE - len < 3) {
1098                 free_cpumask_var(mask);
1099                 return -EINVAL;
1100         }
1101
1102         free_cpumask_var(mask);
1103         len += sprintf(buf + len, "\n");
1104         return len;
1105 }
1106
1107 static ssize_t store_xps_map(struct netdev_queue *queue,
1108                       struct netdev_queue_attribute *attribute,
1109                       const char *buf, size_t len)
1110 {
1111         struct net_device *dev = queue->dev;
1112         unsigned long index;
1113         cpumask_var_t mask;
1114         int err;
1115
1116         if (!capable(CAP_NET_ADMIN))
1117                 return -EPERM;
1118
1119         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1120                 return -ENOMEM;
1121
1122         index = get_netdev_queue_index(queue);
1123
1124         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1125         if (err) {
1126                 free_cpumask_var(mask);
1127                 return err;
1128         }
1129
1130         err = netif_set_xps_queue(dev, mask, index);
1131
1132         free_cpumask_var(mask);
1133
1134         return err ? : len;
1135 }
1136
1137 static struct netdev_queue_attribute xps_cpus_attribute =
1138     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1139 #endif /* CONFIG_XPS */
1140
1141 static struct attribute *netdev_queue_default_attrs[] = {
1142         &queue_trans_timeout.attr,
1143 #ifdef CONFIG_XPS
1144         &xps_cpus_attribute.attr,
1145 #endif
1146         NULL
1147 };
1148
1149 static void netdev_queue_release(struct kobject *kobj)
1150 {
1151         struct netdev_queue *queue = to_netdev_queue(kobj);
1152
1153         memset(kobj, 0, sizeof(*kobj));
1154         dev_put(queue->dev);
1155 }
1156
1157 static const void *netdev_queue_namespace(struct kobject *kobj)
1158 {
1159         struct netdev_queue *queue = to_netdev_queue(kobj);
1160         struct device *dev = &queue->dev->dev;
1161         const void *ns = NULL;
1162
1163         if (dev->class && dev->class->ns_type)
1164                 ns = dev->class->namespace(dev);
1165
1166         return ns;
1167 }
1168
1169 static struct kobj_type netdev_queue_ktype = {
1170         .sysfs_ops = &netdev_queue_sysfs_ops,
1171         .release = netdev_queue_release,
1172         .default_attrs = netdev_queue_default_attrs,
1173         .namespace = netdev_queue_namespace,
1174 };
1175
1176 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1177 {
1178         struct netdev_queue *queue = dev->_tx + index;
1179         struct kobject *kobj = &queue->kobj;
1180         int error = 0;
1181
1182         kobj->kset = dev->queues_kset;
1183         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1184             "tx-%u", index);
1185         if (error)
1186                 goto exit;
1187
1188 #ifdef CONFIG_BQL
1189         error = sysfs_create_group(kobj, &dql_group);
1190         if (error)
1191                 goto exit;
1192 #endif
1193
1194         kobject_uevent(kobj, KOBJ_ADD);
1195         dev_hold(queue->dev);
1196
1197         return 0;
1198 exit:
1199         kobject_put(kobj);
1200         return error;
1201 }
1202 #endif /* CONFIG_SYSFS */
1203
1204 int
1205 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1206 {
1207 #ifdef CONFIG_SYSFS
1208         int i;
1209         int error = 0;
1210
1211         for (i = old_num; i < new_num; i++) {
1212                 error = netdev_queue_add_kobject(dev, i);
1213                 if (error) {
1214                         new_num = old_num;
1215                         break;
1216                 }
1217         }
1218
1219         while (--i >= new_num) {
1220                 struct netdev_queue *queue = dev->_tx + i;
1221
1222 #ifdef CONFIG_BQL
1223                 sysfs_remove_group(&queue->kobj, &dql_group);
1224 #endif
1225                 kobject_put(&queue->kobj);
1226         }
1227
1228         return error;
1229 #else
1230         return 0;
1231 #endif /* CONFIG_SYSFS */
1232 }
1233
1234 static int register_queue_kobjects(struct net_device *dev)
1235 {
1236         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1237
1238 #ifdef CONFIG_SYSFS
1239         dev->queues_kset = kset_create_and_add("queues",
1240             NULL, &dev->dev.kobj);
1241         if (!dev->queues_kset)
1242                 return -ENOMEM;
1243         real_rx = dev->real_num_rx_queues;
1244 #endif
1245         real_tx = dev->real_num_tx_queues;
1246
1247         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1248         if (error)
1249                 goto error;
1250         rxq = real_rx;
1251
1252         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1253         if (error)
1254                 goto error;
1255         txq = real_tx;
1256
1257         return 0;
1258
1259 error:
1260         netdev_queue_update_kobjects(dev, txq, 0);
1261         net_rx_queue_update_kobjects(dev, rxq, 0);
1262         return error;
1263 }
1264
1265 static void remove_queue_kobjects(struct net_device *dev)
1266 {
1267         int real_rx = 0, real_tx = 0;
1268
1269 #ifdef CONFIG_SYSFS
1270         real_rx = dev->real_num_rx_queues;
1271 #endif
1272         real_tx = dev->real_num_tx_queues;
1273
1274         net_rx_queue_update_kobjects(dev, real_rx, 0);
1275         netdev_queue_update_kobjects(dev, real_tx, 0);
1276 #ifdef CONFIG_SYSFS
1277         kset_unregister(dev->queues_kset);
1278 #endif
1279 }
1280
1281 static bool net_current_may_mount(void)
1282 {
1283         struct net *net = current->nsproxy->net_ns;
1284
1285         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1286 }
1287
1288 static void *net_grab_current_ns(void)
1289 {
1290         struct net *ns = current->nsproxy->net_ns;
1291 #ifdef CONFIG_NET_NS
1292         if (ns)
1293                 atomic_inc(&ns->passive);
1294 #endif
1295         return ns;
1296 }
1297
1298 static const void *net_initial_ns(void)
1299 {
1300         return &init_net;
1301 }
1302
1303 static const void *net_netlink_ns(struct sock *sk)
1304 {
1305         return sock_net(sk);
1306 }
1307
1308 struct kobj_ns_type_operations net_ns_type_operations = {
1309         .type = KOBJ_NS_TYPE_NET,
1310         .current_may_mount = net_current_may_mount,
1311         .grab_current_ns = net_grab_current_ns,
1312         .netlink_ns = net_netlink_ns,
1313         .initial_ns = net_initial_ns,
1314         .drop_ns = net_drop_ns,
1315 };
1316 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1317
1318 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1319 {
1320         struct net_device *dev = to_net_dev(d);
1321         int retval;
1322
1323         /* pass interface to uevent. */
1324         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1325         if (retval)
1326                 goto exit;
1327
1328         /* pass ifindex to uevent.
1329          * ifindex is useful as it won't change (interface name may change)
1330          * and is what RtNetlink uses natively. */
1331         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1332
1333 exit:
1334         return retval;
1335 }
1336
1337 /*
1338  *      netdev_release -- destroy and free a dead device.
1339  *      Called when last reference to device kobject is gone.
1340  */
1341 static void netdev_release(struct device *d)
1342 {
1343         struct net_device *dev = to_net_dev(d);
1344
1345         BUG_ON(dev->reg_state != NETREG_RELEASED);
1346
1347         kfree(dev->ifalias);
1348         netdev_freemem(dev);
1349 }
1350
1351 static const void *net_namespace(struct device *d)
1352 {
1353         struct net_device *dev;
1354         dev = container_of(d, struct net_device, dev);
1355         return dev_net(dev);
1356 }
1357
1358 static struct class net_class = {
1359         .name = "net",
1360         .dev_release = netdev_release,
1361         .dev_groups = net_class_groups,
1362         .dev_uevent = netdev_uevent,
1363         .ns_type = &net_ns_type_operations,
1364         .namespace = net_namespace,
1365 };
1366
1367 /* Delete sysfs entries but hold kobject reference until after all
1368  * netdev references are gone.
1369  */
1370 void netdev_unregister_kobject(struct net_device *ndev)
1371 {
1372         struct device *dev = &(ndev->dev);
1373
1374         kobject_get(&dev->kobj);
1375
1376         remove_queue_kobjects(ndev);
1377
1378         pm_runtime_set_memalloc_noio(dev, false);
1379
1380         device_del(dev);
1381 }
1382
1383 /* Create sysfs entries for network device. */
1384 int netdev_register_kobject(struct net_device *ndev)
1385 {
1386         struct device *dev = &(ndev->dev);
1387         const struct attribute_group **groups = ndev->sysfs_groups;
1388         int error = 0;
1389
1390         device_initialize(dev);
1391         dev->class = &net_class;
1392         dev->platform_data = ndev;
1393         dev->groups = groups;
1394
1395         dev_set_name(dev, "%s", ndev->name);
1396
1397 #ifdef CONFIG_SYSFS
1398         /* Allow for a device specific group */
1399         if (*groups)
1400                 groups++;
1401
1402         *groups++ = &netstat_group;
1403
1404 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1405         if (ndev->ieee80211_ptr)
1406                 *groups++ = &wireless_group;
1407 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1408         else if (ndev->wireless_handlers)
1409                 *groups++ = &wireless_group;
1410 #endif
1411 #endif
1412 #endif /* CONFIG_SYSFS */
1413
1414         error = device_add(dev);
1415         if (error)
1416                 return error;
1417
1418         error = register_queue_kobjects(ndev);
1419         if (error) {
1420                 device_del(dev);
1421                 return error;
1422         }
1423
1424         pm_runtime_set_memalloc_noio(dev, true);
1425
1426         return error;
1427 }
1428
1429 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1430                                 const void *ns)
1431 {
1432         return class_create_file_ns(&net_class, class_attr, ns);
1433 }
1434 EXPORT_SYMBOL(netdev_class_create_file_ns);
1435
1436 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1437                                  const void *ns)
1438 {
1439         class_remove_file_ns(&net_class, class_attr, ns);
1440 }
1441 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1442
1443 int __init netdev_kobject_init(void)
1444 {
1445         kobj_ns_type_register(&net_ns_type_operations);
1446         return class_register(&net_class);
1447 }