net/core/net-sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net-sysfs.c - network device class and attributes
   4  *
   5  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
   6  */
   7
   8 #include <linux/capability.h>
   9 #include <linux/kernel.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/if_arp.h>
  12 #include <linux/slab.h>
  13 #include <linux/sched/signal.h>
  14 #include <linux/sched/isolation.h>
  15 #include <linux/nsproxy.h>
  16 #include <net/sock.h>
  17 #include <net/net_namespace.h>
  18 #include <linux/rtnetlink.h>
  19 #include <linux/vmalloc.h>
  20 #include <linux/export.h>
  21 #include <linux/jiffies.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/of.h>
  24 #include <linux/of_net.h>
  25 #include <linux/cpu.h>
  26
  27 #include "net-sysfs.h"
  28
  29 #ifdef CONFIG_SYSFS
  30 static const char fmt_hex[] = "%#x\n";
  31 static const char fmt_dec[] = "%d\n";
  32 static const char fmt_ulong[] = "%lu\n";
  33 static const char fmt_u64[] = "%llu\n";
  34
  35 static inline int dev_isalive(const struct net_device *dev)
  36 {
  37         return dev->reg_state <= NETREG_REGISTERED;
  38 }
  39
  40 /* use same locking rules as GIF* ioctl's */
  41 static ssize_t netdev_show(const struct device *dev,
  42                            struct device_attribute *attr, char *buf,
  43                            ssize_t (*format)(const struct net_device *, char *))
  44 {
  45         struct net_device *ndev = to_net_dev(dev);
  46         ssize_t ret = -EINVAL;
  47
  48         read_lock(&dev_base_lock);
  49         if (dev_isalive(ndev))
  50                 ret = (*format)(ndev, buf);
  51         read_unlock(&dev_base_lock);
  52
  53         return ret;
  54 }
  55
  56 /* generate a show function for simple field */
  57 #define NETDEVICE_SHOW(field, format_string)                            \
  58 static ssize_t format_##field(const struct net_device *dev, char *buf)  \
  59 {                                                                       \
  60         return sprintf(buf, format_string, dev->field);                 \
  61 }                                                                       \
  62 static ssize_t field##_show(struct device *dev,                         \
  63                             struct device_attribute *attr, char *buf)   \
  64 {                                                                       \
  65         return netdev_show(dev, attr, buf, format_##field);             \
  66 }                                                                       \
  67
  68 #define NETDEVICE_SHOW_RO(field, format_string)                         \
  69 NETDEVICE_SHOW(field, format_string);                                   \
  70 static DEVICE_ATTR_RO(field)
  71
  72 #define NETDEVICE_SHOW_RW(field, format_string)                         \
  73 NETDEVICE_SHOW(field, format_string);                                   \
  74 static DEVICE_ATTR_RW(field)
  75
  76 /* use same locking and permission rules as SIF* ioctl's */
  77 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  78                             const char *buf, size_t len,
  79                             int (*set)(struct net_device *, unsigned long))
  80 {
  81         struct net_device *netdev = to_net_dev(dev);
  82         struct net *net = dev_net(netdev);
  83         unsigned long new;
  84         int ret;
  85
  86         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  87                 return -EPERM;
  88
  89         ret = kstrtoul(buf, 0, &new);
  90         if (ret)
  91                 goto err;
  92
  93         if (!rtnl_trylock())
  94                 return restart_syscall();
  95
  96         if (dev_isalive(netdev)) {
  97                 ret = (*set)(netdev, new);
  98                 if (ret == 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(ifindex, fmt_dec);
 111 NETDEVICE_SHOW_RO(type, fmt_dec);
 112 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 113
 114 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
 115                            char *buf)
 116 {
 117         struct net_device *ndev = to_net_dev(dev);
 118
 119         return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
 120 }
 121 static DEVICE_ATTR_RO(iflink);
 122
 123 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 124 {
 125         return sprintf(buf, fmt_dec, dev->name_assign_type);
 126 }
 127
 128 static ssize_t name_assign_type_show(struct device *dev,
 129                                      struct device_attribute *attr,
 130                                      char *buf)
 131 {
 132         struct net_device *ndev = to_net_dev(dev);
 133         ssize_t ret = -EINVAL;
 134
 135         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
 136                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
 137
 138         return ret;
 139 }
 140 static DEVICE_ATTR_RO(name_assign_type);
 141
 142 /* use same locking rules as GIFHWADDR ioctl's */
 143 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 144                             char *buf)
 145 {
 146         struct net_device *ndev = to_net_dev(dev);
 147         ssize_t ret = -EINVAL;
 148
 149         read_lock(&dev_base_lock);
 150         if (dev_isalive(ndev))
 151                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 152         read_unlock(&dev_base_lock);
 153         return ret;
 154 }
 155 static DEVICE_ATTR_RO(address);
 156
 157 static ssize_t broadcast_show(struct device *dev,
 158                               struct device_attribute *attr, char *buf)
 159 {
 160         struct net_device *ndev = to_net_dev(dev);
 161
 162         if (dev_isalive(ndev))
 163                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
 164         return -EINVAL;
 165 }
 166 static DEVICE_ATTR_RO(broadcast);
 167
 168 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
 169 {
 170         if (!netif_running(dev))
 171                 return -EINVAL;
 172         return dev_change_carrier(dev, (bool)new_carrier);
 173 }
 174
 175 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 176                              const char *buf, size_t len)
 177 {
 178         struct net_device *netdev = to_net_dev(dev);
 179
 180         /* The check is also done in change_carrier; this helps returning early
 181          * without hitting the trylock/restart in netdev_store.
 182          */
 183         if (!netdev->netdev_ops->ndo_change_carrier)
 184                 return -EOPNOTSUPP;
 185
 186         return netdev_store(dev, attr, buf, len, change_carrier);
 187 }
 188
 189 static ssize_t carrier_show(struct device *dev,
 190                             struct device_attribute *attr, char *buf)
 191 {
 192         struct net_device *netdev = to_net_dev(dev);
 193
 194         if (netif_running(netdev))
 195                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 196
 197         return -EINVAL;
 198 }
 199 static DEVICE_ATTR_RW(carrier);
 200
 201 static ssize_t speed_show(struct device *dev,
 202                           struct device_attribute *attr, char *buf)
 203 {
 204         struct net_device *netdev = to_net_dev(dev);
 205         int ret = -EINVAL;
 206
 207         /* The check is also done in __ethtool_get_link_ksettings; this helps
 208          * returning early without hitting the trylock/restart below.
 209          */
 210         if (!netdev->ethtool_ops->get_link_ksettings)
 211                 return ret;
 212
 213         if (!rtnl_trylock())
 214                 return restart_syscall();
 215
 216         if (netif_running(netdev)) {
 217                 struct ethtool_link_ksettings cmd;
 218
 219                 if (!__ethtool_get_link_ksettings(netdev, &cmd))
 220                         ret = sprintf(buf, fmt_dec, cmd.base.speed);
 221         }
 222         rtnl_unlock();
 223         return ret;
 224 }
 225 static DEVICE_ATTR_RO(speed);
 226
 227 static ssize_t duplex_show(struct device *dev,
 228                            struct device_attribute *attr, char *buf)
 229 {
 230         struct net_device *netdev = to_net_dev(dev);
 231         int ret = -EINVAL;
 232
 233         /* The check is also done in __ethtool_get_link_ksettings; this helps
 234          * returning early without hitting the trylock/restart below.
 235          */
 236         if (!netdev->ethtool_ops->get_link_ksettings)
 237                 return ret;
 238
 239         if (!rtnl_trylock())
 240                 return restart_syscall();
 241
 242         if (netif_running(netdev)) {
 243                 struct ethtool_link_ksettings cmd;
 244
 245                 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
 246                         const char *duplex;
 247
 248                         switch (cmd.base.duplex) {
 249                         case DUPLEX_HALF:
 250                                 duplex = "half";
 251                                 break;
 252                         case DUPLEX_FULL:
 253                                 duplex = "full";
 254                                 break;
 255                         default:
 256                                 duplex = "unknown";
 257                                 break;
 258                         }
 259                         ret = sprintf(buf, "%s\n", duplex);
 260                 }
 261         }
 262         rtnl_unlock();
 263         return ret;
 264 }
 265 static DEVICE_ATTR_RO(duplex);
 266
 267 static ssize_t testing_show(struct device *dev,
 268                             struct device_attribute *attr, char *buf)
 269 {
 270         struct net_device *netdev = to_net_dev(dev);
 271
 272         if (netif_running(netdev))
 273                 return sprintf(buf, fmt_dec, !!netif_testing(netdev));
 274
 275         return -EINVAL;
 276 }
 277 static DEVICE_ATTR_RO(testing);
 278
 279 static ssize_t dormant_show(struct device *dev,
 280                             struct device_attribute *attr, char *buf)
 281 {
 282         struct net_device *netdev = to_net_dev(dev);
 283
 284         if (netif_running(netdev))
 285                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 286
 287         return -EINVAL;
 288 }
 289 static DEVICE_ATTR_RO(dormant);
 290
 291 static const char *const operstates[] = {
 292         "unknown",
 293         "notpresent", /* currently unused */
 294         "down",
 295         "lowerlayerdown",
 296         "testing",
 297         "dormant",
 298         "up"
 299 };
 300
 301 static ssize_t operstate_show(struct device *dev,
 302                               struct device_attribute *attr, char *buf)
 303 {
 304         const struct net_device *netdev = to_net_dev(dev);
 305         unsigned char operstate;
 306
 307         read_lock(&dev_base_lock);
 308         operstate = netdev->operstate;
 309         if (!netif_running(netdev))
 310                 operstate = IF_OPER_DOWN;
 311         read_unlock(&dev_base_lock);
 312
 313         if (operstate >= ARRAY_SIZE(operstates))
 314                 return -EINVAL; /* should not happen */
 315
 316         return sprintf(buf, "%s\n", operstates[operstate]);
 317 }
 318 static DEVICE_ATTR_RO(operstate);
 319
 320 static ssize_t carrier_changes_show(struct device *dev,
 321                                     struct device_attribute *attr,
 322                                     char *buf)
 323 {
 324         struct net_device *netdev = to_net_dev(dev);
 325
 326         return sprintf(buf, fmt_dec,
 327                        atomic_read(&netdev->carrier_up_count) +
 328                        atomic_read(&netdev->carrier_down_count));
 329 }
 330 static DEVICE_ATTR_RO(carrier_changes);
 331
 332 static ssize_t carrier_up_count_show(struct device *dev,
 333                                      struct device_attribute *attr,
 334                                      char *buf)
 335 {
 336         struct net_device *netdev = to_net_dev(dev);
 337
 338         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
 339 }
 340 static DEVICE_ATTR_RO(carrier_up_count);
 341
 342 static ssize_t carrier_down_count_show(struct device *dev,
 343                                        struct device_attribute *attr,
 344                                        char *buf)
 345 {
 346         struct net_device *netdev = to_net_dev(dev);
 347
 348         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
 349 }
 350 static DEVICE_ATTR_RO(carrier_down_count);
 351
 352 /* read-write attributes */
 353
 354 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 355 {
 356         return dev_set_mtu(dev, (int)new_mtu);
 357 }
 358
 359 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 360                          const char *buf, size_t len)
 361 {
 362         return netdev_store(dev, attr, buf, len, change_mtu);
 363 }
 364 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 365
 366 static int change_flags(struct net_device *dev, unsigned long new_flags)
 367 {
 368         return dev_change_flags(dev, (unsigned int)new_flags, NULL);
 369 }
 370
 371 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 372                            const char *buf, size_t len)
 373 {
 374         return netdev_store(dev, attr, buf, len, change_flags);
 375 }
 376 NETDEVICE_SHOW_RW(flags, fmt_hex);
 377
 378 static ssize_t tx_queue_len_store(struct device *dev,
 379                                   struct device_attribute *attr,
 380                                   const char *buf, size_t len)
 381 {
 382         if (!capable(CAP_NET_ADMIN))
 383                 return -EPERM;
 384
 385         return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
 386 }
 387 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
 388
 389 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 390 {
 391         WRITE_ONCE(dev->gro_flush_timeout, val);
 392         return 0;
 393 }
 394
 395 static ssize_t gro_flush_timeout_store(struct device *dev,
 396                                        struct device_attribute *attr,
 397                                        const char *buf, size_t len)
 398 {
 399         if (!capable(CAP_NET_ADMIN))
 400                 return -EPERM;
 401
 402         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 403 }
 404 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 405
 406 static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val)
 407 {
 408         WRITE_ONCE(dev->napi_defer_hard_irqs, val);
 409         return 0;
 410 }
 411
 412 static ssize_t napi_defer_hard_irqs_store(struct device *dev,
 413                                           struct device_attribute *attr,
 414                                           const char *buf, size_t len)
 415 {
 416         if (!capable(CAP_NET_ADMIN))
 417                 return -EPERM;
 418
 419         return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs);
 420 }
 421 NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec);
 422
 423 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 424                              const char *buf, size_t len)
 425 {
 426         struct net_device *netdev = to_net_dev(dev);
 427         struct net *net = dev_net(netdev);
 428         size_t count = len;
 429         ssize_t ret = 0;
 430
 431         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 432                 return -EPERM;
 433
 434         /* ignore trailing newline */
 435         if (len >  0 && buf[len - 1] == '\n')
 436                 --count;
 437
 438         if (!rtnl_trylock())
 439                 return restart_syscall();
 440
 441         if (dev_isalive(netdev)) {
 442                 ret = dev_set_alias(netdev, buf, count);
 443                 if (ret < 0)
 444                         goto err;
 445                 ret = len;
 446                 netdev_state_change(netdev);
 447         }
 448 err:
 449         rtnl_unlock();
 450
 451         return ret;
 452 }
 453
 454 static ssize_t ifalias_show(struct device *dev,
 455                             struct device_attribute *attr, char *buf)
 456 {
 457         const struct net_device *netdev = to_net_dev(dev);
 458         char tmp[IFALIASZ];
 459         ssize_t ret = 0;
 460
 461         ret = dev_get_alias(netdev, tmp, sizeof(tmp));
 462         if (ret > 0)
 463                 ret = sprintf(buf, "%s\n", tmp);
 464         return ret;
 465 }
 466 static DEVICE_ATTR_RW(ifalias);
 467
 468 static int change_group(struct net_device *dev, unsigned long new_group)
 469 {
 470         dev_set_group(dev, (int)new_group);
 471         return 0;
 472 }
 473
 474 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 475                            const char *buf, size_t len)
 476 {
 477         return netdev_store(dev, attr, buf, len, change_group);
 478 }
 479 NETDEVICE_SHOW(group, fmt_dec);
 480 static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
 481
 482 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 483 {
 484         return dev_change_proto_down(dev, (bool)proto_down);
 485 }
 486
 487 static ssize_t proto_down_store(struct device *dev,
 488                                 struct device_attribute *attr,
 489                                 const char *buf, size_t len)
 490 {
 491         struct net_device *netdev = to_net_dev(dev);
 492
 493         /* The check is also done in change_proto_down; this helps returning
 494          * early without hitting the trylock/restart in netdev_store.
 495          */
 496         if (!netdev->netdev_ops->ndo_change_proto_down)
 497                 return -EOPNOTSUPP;
 498
 499         return netdev_store(dev, attr, buf, len, change_proto_down);
 500 }
 501 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 502
 503 static ssize_t phys_port_id_show(struct device *dev,
 504                                  struct device_attribute *attr, char *buf)
 505 {
 506         struct net_device *netdev = to_net_dev(dev);
 507         ssize_t ret = -EINVAL;
 508
 509         /* The check is also done in dev_get_phys_port_id; this helps returning
 510          * early without hitting the trylock/restart below.
 511          */
 512         if (!netdev->netdev_ops->ndo_get_phys_port_id)
 513                 return -EOPNOTSUPP;
 514
 515         if (!rtnl_trylock())
 516                 return restart_syscall();
 517
 518         if (dev_isalive(netdev)) {
 519                 struct netdev_phys_item_id ppid;
 520
 521                 ret = dev_get_phys_port_id(netdev, &ppid);
 522                 if (!ret)
 523                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 524         }
 525         rtnl_unlock();
 526
 527         return ret;
 528 }
 529 static DEVICE_ATTR_RO(phys_port_id);
 530
 531 static ssize_t phys_port_name_show(struct device *dev,
 532                                    struct device_attribute *attr, char *buf)
 533 {
 534         struct net_device *netdev = to_net_dev(dev);
 535         ssize_t ret = -EINVAL;
 536
 537         /* The checks are also done in dev_get_phys_port_name; this helps
 538          * returning early without hitting the trylock/restart below.
 539          */
 540         if (!netdev->netdev_ops->ndo_get_phys_port_name &&
 541             !netdev->netdev_ops->ndo_get_devlink_port)
 542                 return -EOPNOTSUPP;
 543
 544         if (!rtnl_trylock())
 545                 return restart_syscall();
 546
 547         if (dev_isalive(netdev)) {
 548                 char name[IFNAMSIZ];
 549
 550                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 551                 if (!ret)
 552                         ret = sprintf(buf, "%s\n", name);
 553         }
 554         rtnl_unlock();
 555
 556         return ret;
 557 }
 558 static DEVICE_ATTR_RO(phys_port_name);
 559
 560 static ssize_t phys_switch_id_show(struct device *dev,
 561                                    struct device_attribute *attr, char *buf)
 562 {
 563         struct net_device *netdev = to_net_dev(dev);
 564         ssize_t ret = -EINVAL;
 565
 566         /* The checks are also done in dev_get_phys_port_name; this helps
 567          * returning early without hitting the trylock/restart below. This works
 568          * because recurse is false when calling dev_get_port_parent_id.
 569          */
 570         if (!netdev->netdev_ops->ndo_get_port_parent_id &&
 571             !netdev->netdev_ops->ndo_get_devlink_port)
 572                 return -EOPNOTSUPP;
 573
 574         if (!rtnl_trylock())
 575                 return restart_syscall();
 576
 577         if (dev_isalive(netdev)) {
 578                 struct netdev_phys_item_id ppid = { };
 579
 580                 ret = dev_get_port_parent_id(netdev, &ppid, false);
 581                 if (!ret)
 582                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 583         }
 584         rtnl_unlock();
 585
 586         return ret;
 587 }
 588 static DEVICE_ATTR_RO(phys_switch_id);
 589
 590 static ssize_t threaded_show(struct device *dev,
 591                              struct device_attribute *attr, char *buf)
 592 {
 593         struct net_device *netdev = to_net_dev(dev);
 594         ssize_t ret = -EINVAL;
 595
 596         if (!rtnl_trylock())
 597                 return restart_syscall();
 598
 599         if (dev_isalive(netdev))
 600                 ret = sprintf(buf, fmt_dec, netdev->threaded);
 601
 602         rtnl_unlock();
 603         return ret;
 604 }
 605
 606 static int modify_napi_threaded(struct net_device *dev, unsigned long val)
 607 {
 608         int ret;
 609
 610         if (list_empty(&dev->napi_list))
 611                 return -EOPNOTSUPP;
 612
 613         if (val != 0 && val != 1)
 614                 return -EOPNOTSUPP;
 615
 616         ret = dev_set_threaded(dev, val);
 617
 618         return ret;
 619 }
 620
 621 static ssize_t threaded_store(struct device *dev,
 622                               struct device_attribute *attr,
 623                               const char *buf, size_t len)
 624 {
 625         return netdev_store(dev, attr, buf, len, modify_napi_threaded);
 626 }
 627 static DEVICE_ATTR_RW(threaded);
 628
 629 static struct attribute *net_class_attrs[] __ro_after_init = {
 630         &dev_attr_netdev_group.attr,
 631         &dev_attr_type.attr,
 632         &dev_attr_dev_id.attr,
 633         &dev_attr_dev_port.attr,
 634         &dev_attr_iflink.attr,
 635         &dev_attr_ifindex.attr,
 636         &dev_attr_name_assign_type.attr,
 637         &dev_attr_addr_assign_type.attr,
 638         &dev_attr_addr_len.attr,
 639         &dev_attr_link_mode.attr,
 640         &dev_attr_address.attr,
 641         &dev_attr_broadcast.attr,
 642         &dev_attr_speed.attr,
 643         &dev_attr_duplex.attr,
 644         &dev_attr_dormant.attr,
 645         &dev_attr_testing.attr,
 646         &dev_attr_operstate.attr,
 647         &dev_attr_carrier_changes.attr,
 648         &dev_attr_ifalias.attr,
 649         &dev_attr_carrier.attr,
 650         &dev_attr_mtu.attr,
 651         &dev_attr_flags.attr,
 652         &dev_attr_tx_queue_len.attr,
 653         &dev_attr_gro_flush_timeout.attr,
 654         &dev_attr_napi_defer_hard_irqs.attr,
 655         &dev_attr_phys_port_id.attr,
 656         &dev_attr_phys_port_name.attr,
 657         &dev_attr_phys_switch_id.attr,
 658         &dev_attr_proto_down.attr,
 659         &dev_attr_carrier_up_count.attr,
 660         &dev_attr_carrier_down_count.attr,
 661         &dev_attr_threaded.attr,
 662         NULL,
 663 };
 664 ATTRIBUTE_GROUPS(net_class);
 665
 666 /* Show a given an attribute in the statistics group */
 667 static ssize_t netstat_show(const struct device *d,
 668                             struct device_attribute *attr, char *buf,
 669                             unsigned long offset)
 670 {
 671         struct net_device *dev = to_net_dev(d);
 672         ssize_t ret = -EINVAL;
 673
 674         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 675                 offset % sizeof(u64) != 0);
 676
 677         read_lock(&dev_base_lock);
 678         if (dev_isalive(dev)) {
 679                 struct rtnl_link_stats64 temp;
 680                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 681
 682                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
 683         }
 684         read_unlock(&dev_base_lock);
 685         return ret;
 686 }
 687
 688 /* generate a read-only statistics attribute */
 689 #define NETSTAT_ENTRY(name)                                             \
 690 static ssize_t name##_show(struct device *d,                            \
 691                            struct device_attribute *attr, char *buf)    \
 692 {                                                                       \
 693         return netstat_show(d, attr, buf,                               \
 694                             offsetof(struct rtnl_link_stats64, name));  \
 695 }                                                                       \
 696 static DEVICE_ATTR_RO(name)
 697
 698 NETSTAT_ENTRY(rx_packets);
 699 NETSTAT_ENTRY(tx_packets);
 700 NETSTAT_ENTRY(rx_bytes);
 701 NETSTAT_ENTRY(tx_bytes);
 702 NETSTAT_ENTRY(rx_errors);
 703 NETSTAT_ENTRY(tx_errors);
 704 NETSTAT_ENTRY(rx_dropped);
 705 NETSTAT_ENTRY(tx_dropped);
 706 NETSTAT_ENTRY(multicast);
 707 NETSTAT_ENTRY(collisions);
 708 NETSTAT_ENTRY(rx_length_errors);
 709 NETSTAT_ENTRY(rx_over_errors);
 710 NETSTAT_ENTRY(rx_crc_errors);
 711 NETSTAT_ENTRY(rx_frame_errors);
 712 NETSTAT_ENTRY(rx_fifo_errors);
 713 NETSTAT_ENTRY(rx_missed_errors);
 714 NETSTAT_ENTRY(tx_aborted_errors);
 715 NETSTAT_ENTRY(tx_carrier_errors);
 716 NETSTAT_ENTRY(tx_fifo_errors);
 717 NETSTAT_ENTRY(tx_heartbeat_errors);
 718 NETSTAT_ENTRY(tx_window_errors);
 719 NETSTAT_ENTRY(rx_compressed);
 720 NETSTAT_ENTRY(tx_compressed);
 721 NETSTAT_ENTRY(rx_nohandler);
 722
 723 static struct attribute *netstat_attrs[] __ro_after_init = {
 724         &dev_attr_rx_packets.attr,
 725         &dev_attr_tx_packets.attr,
 726         &dev_attr_rx_bytes.attr,
 727         &dev_attr_tx_bytes.attr,
 728         &dev_attr_rx_errors.attr,
 729         &dev_attr_tx_errors.attr,
 730         &dev_attr_rx_dropped.attr,
 731         &dev_attr_tx_dropped.attr,
 732         &dev_attr_multicast.attr,
 733         &dev_attr_collisions.attr,
 734         &dev_attr_rx_length_errors.attr,
 735         &dev_attr_rx_over_errors.attr,
 736         &dev_attr_rx_crc_errors.attr,
 737         &dev_attr_rx_frame_errors.attr,
 738         &dev_attr_rx_fifo_errors.attr,
 739         &dev_attr_rx_missed_errors.attr,
 740         &dev_attr_tx_aborted_errors.attr,
 741         &dev_attr_tx_carrier_errors.attr,
 742         &dev_attr_tx_fifo_errors.attr,
 743         &dev_attr_tx_heartbeat_errors.attr,
 744         &dev_attr_tx_window_errors.attr,
 745         &dev_attr_rx_compressed.attr,
 746         &dev_attr_tx_compressed.attr,
 747         &dev_attr_rx_nohandler.attr,
 748         NULL
 749 };
 750
 751 static const struct attribute_group netstat_group = {
 752         .name  = "statistics",
 753         .attrs  = netstat_attrs,
 754 };
 755
 756 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 757 static struct attribute *wireless_attrs[] = {
 758         NULL
 759 };
 760
 761 static const struct attribute_group wireless_group = {
 762         .name = "wireless",
 763         .attrs = wireless_attrs,
 764 };
 765 #endif
 766
 767 #else /* CONFIG_SYSFS */
 768 #define net_class_groups        NULL
 769 #endif /* CONFIG_SYSFS */
 770
 771 #ifdef CONFIG_SYSFS
 772 #define to_rx_queue_attr(_attr) \
 773         container_of(_attr, struct rx_queue_attribute, attr)
 774
 775 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 776
 777 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 778                                   char *buf)
 779 {
 780         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 781         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 782
 783         if (!attribute->show)
 784                 return -EIO;
 785
 786         return attribute->show(queue, buf);
 787 }
 788
 789 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 790                                    const char *buf, size_t count)
 791 {
 792         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 793         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 794
 795         if (!attribute->store)
 796                 return -EIO;
 797
 798         return attribute->store(queue, buf, count);
 799 }
 800
 801 static const struct sysfs_ops rx_queue_sysfs_ops = {
 802         .show = rx_queue_attr_show,
 803         .store = rx_queue_attr_store,
 804 };
 805
 806 #ifdef CONFIG_RPS
 807 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
 808 {
 809         struct rps_map *map;
 810         cpumask_var_t mask;
 811         int i, len;
 812
 813         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 814                 return -ENOMEM;
 815
 816         rcu_read_lock();
 817         map = rcu_dereference(queue->rps_map);
 818         if (map)
 819                 for (i = 0; i < map->len; i++)
 820                         cpumask_set_cpu(map->cpus[i], mask);
 821
 822         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 823         rcu_read_unlock();
 824         free_cpumask_var(mask);
 825
 826         return len < PAGE_SIZE ? len : -EINVAL;
 827 }
 828
 829 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 830                              const char *buf, size_t len)
 831 {
 832         struct rps_map *old_map, *map;
 833         cpumask_var_t mask;
 834         int err, cpu, i, hk_flags;
 835         static DEFINE_MUTEX(rps_map_mutex);
 836
 837         if (!capable(CAP_NET_ADMIN))
 838                 return -EPERM;
 839
 840         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 841                 return -ENOMEM;
 842
 843         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 844         if (err) {
 845                 free_cpumask_var(mask);
 846                 return err;
 847         }
 848
 849         if (!cpumask_empty(mask)) {
 850                 hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
 851                 cpumask_and(mask, mask, housekeeping_cpumask(hk_flags));
 852                 if (cpumask_empty(mask)) {
 853                         free_cpumask_var(mask);
 854                         return -EINVAL;
 855                 }
 856         }
 857
 858         map = kzalloc(max_t(unsigned int,
 859                             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 860                       GFP_KERNEL);
 861         if (!map) {
 862                 free_cpumask_var(mask);
 863                 return -ENOMEM;
 864         }
 865
 866         i = 0;
 867         for_each_cpu_and(cpu, mask, cpu_online_mask)
 868                 map->cpus[i++] = cpu;
 869
 870         if (i) {
 871                 map->len = i;
 872         } else {
 873                 kfree(map);
 874                 map = NULL;
 875         }
 876
 877         mutex_lock(&rps_map_mutex);
 878         old_map = rcu_dereference_protected(queue->rps_map,
 879                                             mutex_is_locked(&rps_map_mutex));
 880         rcu_assign_pointer(queue->rps_map, map);
 881
 882         if (map)
 883                 static_branch_inc(&rps_needed);
 884         if (old_map)
 885                 static_branch_dec(&rps_needed);
 886
 887         mutex_unlock(&rps_map_mutex);
 888
 889         if (old_map)
 890                 kfree_rcu(old_map, rcu);
 891
 892         free_cpumask_var(mask);
 893         return len;
 894 }
 895
 896 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 897                                            char *buf)
 898 {
 899         struct rps_dev_flow_table *flow_table;
 900         unsigned long val = 0;
 901
 902         rcu_read_lock();
 903         flow_table = rcu_dereference(queue->rps_flow_table);
 904         if (flow_table)
 905                 val = (unsigned long)flow_table->mask + 1;
 906         rcu_read_unlock();
 907
 908         return sprintf(buf, "%lu\n", val);
 909 }
 910
 911 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 912 {
 913         struct rps_dev_flow_table *table = container_of(rcu,
 914             struct rps_dev_flow_table, rcu);
 915         vfree(table);
 916 }
 917
 918 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 919                                             const char *buf, size_t len)
 920 {
 921         unsigned long mask, count;
 922         struct rps_dev_flow_table *table, *old_table;
 923         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 924         int rc;
 925
 926         if (!capable(CAP_NET_ADMIN))
 927                 return -EPERM;
 928
 929         rc = kstrtoul(buf, 0, &count);
 930         if (rc < 0)
 931                 return rc;
 932
 933         if (count) {
 934                 mask = count - 1;
 935                 /* mask = roundup_pow_of_two(count) - 1;
 936                  * without overflows...
 937                  */
 938                 while ((mask | (mask >> 1)) != mask)
 939                         mask |= (mask >> 1);
 940                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 941                  * and on 32bit arches, must check
 942                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 943                  */
 944 #if BITS_PER_LONG > 32
 945                 if (mask > (unsigned long)(u32)mask)
 946                         return -EINVAL;
 947 #else
 948                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 949                                 / sizeof(struct rps_dev_flow)) {
 950                         /* Enforce a limit to prevent overflow */
 951                         return -EINVAL;
 952                 }
 953 #endif
 954                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 955                 if (!table)
 956                         return -ENOMEM;
 957
 958                 table->mask = mask;
 959                 for (count = 0; count <= mask; count++)
 960                         table->flows[count].cpu = RPS_NO_CPU;
 961         } else {
 962                 table = NULL;
 963         }
 964
 965         spin_lock(&rps_dev_flow_lock);
 966         old_table = rcu_dereference_protected(queue->rps_flow_table,
 967                                               lockdep_is_held(&rps_dev_flow_lock));
 968         rcu_assign_pointer(queue->rps_flow_table, table);
 969         spin_unlock(&rps_dev_flow_lock);
 970
 971         if (old_table)
 972                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 973
 974         return len;
 975 }
 976
 977 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
 978         = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
 979
 980 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
 981         = __ATTR(rps_flow_cnt, 0644,
 982                  show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 983 #endif /* CONFIG_RPS */
 984
 985 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
 986 #ifdef CONFIG_RPS
 987         &rps_cpus_attribute.attr,
 988         &rps_dev_flow_table_cnt_attribute.attr,
 989 #endif
 990         NULL
 991 };
 992 ATTRIBUTE_GROUPS(rx_queue_default);
 993
 994 static void rx_queue_release(struct kobject *kobj)
 995 {
 996         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 997 #ifdef CONFIG_RPS
 998         struct rps_map *map;
 999         struct rps_dev_flow_table *flow_table;
1000
1001         map = rcu_dereference_protected(queue->rps_map, 1);
1002         if (map) {
1003                 RCU_INIT_POINTER(queue->rps_map, NULL);
1004                 kfree_rcu(map, rcu);
1005         }
1006
1007         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
1008         if (flow_table) {
1009                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
1010                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
1011         }
1012 #endif
1013
1014         memset(kobj, 0, sizeof(*kobj));
1015         dev_put(queue->dev);
1016 }
1017
1018 static const void *rx_queue_namespace(struct kobject *kobj)
1019 {
1020         struct netdev_rx_queue *queue = to_rx_queue(kobj);
1021         struct device *dev = &queue->dev->dev;
1022         const void *ns = NULL;
1023
1024         if (dev->class && dev->class->ns_type)
1025                 ns = dev->class->namespace(dev);
1026
1027         return ns;
1028 }
1029
1030 static void rx_queue_get_ownership(struct kobject *kobj,
1031                                    kuid_t *uid, kgid_t *gid)
1032 {
1033         const struct net *net = rx_queue_namespace(kobj);
1034
1035         net_ns_get_ownership(net, uid, gid);
1036 }
1037
1038 static struct kobj_type rx_queue_ktype __ro_after_init = {
1039         .sysfs_ops = &rx_queue_sysfs_ops,
1040         .release = rx_queue_release,
1041         .default_groups = rx_queue_default_groups,
1042         .namespace = rx_queue_namespace,
1043         .get_ownership = rx_queue_get_ownership,
1044 };
1045
1046 static int rx_queue_add_kobject(struct net_device *dev, int index)
1047 {
1048         struct netdev_rx_queue *queue = dev->_rx + index;
1049         struct kobject *kobj = &queue->kobj;
1050         int error = 0;
1051
1052         /* Kobject_put later will trigger rx_queue_release call which
1053          * decreases dev refcount: Take that reference here
1054          */
1055         dev_hold(queue->dev);
1056
1057         kobj->kset = dev->queues_kset;
1058         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
1059                                      "rx-%u", index);
1060         if (error)
1061                 goto err;
1062
1063         if (dev->sysfs_rx_queue_group) {
1064                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
1065                 if (error)
1066                         goto err;
1067         }
1068
1069         kobject_uevent(kobj, KOBJ_ADD);
1070
1071         return error;
1072
1073 err:
1074         kobject_put(kobj);
1075         return error;
1076 }
1077
1078 static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
1079                                  kgid_t kgid)
1080 {
1081         struct netdev_rx_queue *queue = dev->_rx + index;
1082         struct kobject *kobj = &queue->kobj;
1083         int error;
1084
1085         error = sysfs_change_owner(kobj, kuid, kgid);
1086         if (error)
1087                 return error;
1088
1089         if (dev->sysfs_rx_queue_group)
1090                 error = sysfs_group_change_owner(
1091                         kobj, dev->sysfs_rx_queue_group, kuid, kgid);
1092
1093         return error;
1094 }
1095 #endif /* CONFIG_SYSFS */
1096
1097 int
1098 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1099 {
1100 #ifdef CONFIG_SYSFS
1101         int i;
1102         int error = 0;
1103
1104 #ifndef CONFIG_RPS
1105         if (!dev->sysfs_rx_queue_group)
1106                 return 0;
1107 #endif
1108         for (i = old_num; i < new_num; i++) {
1109                 error = rx_queue_add_kobject(dev, i);
1110                 if (error) {
1111                         new_num = old_num;
1112                         break;
1113                 }
1114         }
1115
1116         while (--i >= new_num) {
1117                 struct kobject *kobj = &dev->_rx[i].kobj;
1118
1119                 if (!refcount_read(&dev_net(dev)->ns.count))
1120                         kobj->uevent_suppress = 1;
1121                 if (dev->sysfs_rx_queue_group)
1122                         sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
1123                 kobject_put(kobj);
1124         }
1125
1126         return error;
1127 #else
1128         return 0;
1129 #endif
1130 }
1131
1132 static int net_rx_queue_change_owner(struct net_device *dev, int num,
1133                                      kuid_t kuid, kgid_t kgid)
1134 {
1135 #ifdef CONFIG_SYSFS
1136         int error = 0;
1137         int i;
1138
1139 #ifndef CONFIG_RPS
1140         if (!dev->sysfs_rx_queue_group)
1141                 return 0;
1142 #endif
1143         for (i = 0; i < num; i++) {
1144                 error = rx_queue_change_owner(dev, i, kuid, kgid);
1145                 if (error)
1146                         break;
1147         }
1148
1149         return error;
1150 #else
1151         return 0;
1152 #endif
1153 }
1154
1155 #ifdef CONFIG_SYSFS
1156 /*
1157  * netdev_queue sysfs structures and functions.
1158  */
1159 struct netdev_queue_attribute {
1160         struct attribute attr;
1161         ssize_t (*show)(struct netdev_queue *queue, char *buf);
1162         ssize_t (*store)(struct netdev_queue *queue,
1163                          const char *buf, size_t len);
1164 };
1165 #define to_netdev_queue_attr(_attr) \
1166         container_of(_attr, struct netdev_queue_attribute, attr)
1167
1168 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1169
1170 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1171                                       struct attribute *attr, char *buf)
1172 {
1173         const struct netdev_queue_attribute *attribute
1174                 = to_netdev_queue_attr(attr);
1175         struct netdev_queue *queue = to_netdev_queue(kobj);
1176
1177         if (!attribute->show)
1178                 return -EIO;
1179
1180         return attribute->show(queue, buf);
1181 }
1182
1183 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1184                                        struct attribute *attr,
1185                                        const char *buf, size_t count)
1186 {
1187         const struct netdev_queue_attribute *attribute
1188                 = to_netdev_queue_attr(attr);
1189         struct netdev_queue *queue = to_netdev_queue(kobj);
1190
1191         if (!attribute->store)
1192                 return -EIO;
1193
1194         return attribute->store(queue, buf, count);
1195 }
1196
1197 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1198         .show = netdev_queue_attr_show,
1199         .store = netdev_queue_attr_store,
1200 };
1201
1202 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1203 {
1204         unsigned long trans_timeout = atomic_long_read(&queue->trans_timeout);
1205
1206         return sprintf(buf, fmt_ulong, trans_timeout);
1207 }
1208
1209 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1210 {
1211         struct net_device *dev = queue->dev;
1212         unsigned int i;
1213
1214         i = queue - dev->_tx;
1215         BUG_ON(i >= dev->num_tx_queues);
1216
1217         return i;
1218 }
1219
1220 static ssize_t traffic_class_show(struct netdev_queue *queue,
1221                                   char *buf)
1222 {
1223         struct net_device *dev = queue->dev;
1224         int num_tc, tc;
1225         int index;
1226
1227         if (!netif_is_multiqueue(dev))
1228                 return -ENOENT;
1229
1230         if (!rtnl_trylock())
1231                 return restart_syscall();
1232
1233         index = get_netdev_queue_index(queue);
1234
1235         /* If queue belongs to subordinate dev use its TC mapping */
1236         dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1237
1238         num_tc = dev->num_tc;
1239         tc = netdev_txq_to_tc(dev, index);
1240
1241         rtnl_unlock();
1242
1243         if (tc < 0)
1244                 return -EINVAL;
1245
1246         /* We can report the traffic class one of two ways:
1247          * Subordinate device traffic classes are reported with the traffic
1248          * class first, and then the subordinate class so for example TC0 on
1249          * subordinate device 2 will be reported as "0-2". If the queue
1250          * belongs to the root device it will be reported with just the
1251          * traffic class, so just "0" for TC 0 for example.
1252          */
1253         return num_tc < 0 ? sprintf(buf, "%d%d\n", tc, num_tc) :
1254                             sprintf(buf, "%d\n", tc);
1255 }
1256
1257 #ifdef CONFIG_XPS
1258 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1259                                char *buf)
1260 {
1261         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1262 }
1263
1264 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1265                                 const char *buf, size_t len)
1266 {
1267         struct net_device *dev = queue->dev;
1268         int err, index = get_netdev_queue_index(queue);
1269         u32 rate = 0;
1270
1271         if (!capable(CAP_NET_ADMIN))
1272                 return -EPERM;
1273
1274         /* The check is also done later; this helps returning early without
1275          * hitting the trylock/restart below.
1276          */
1277         if (!dev->netdev_ops->ndo_set_tx_maxrate)
1278                 return -EOPNOTSUPP;
1279
1280         err = kstrtou32(buf, 10, &rate);
1281         if (err < 0)
1282                 return err;
1283
1284         if (!rtnl_trylock())
1285                 return restart_syscall();
1286
1287         err = -EOPNOTSUPP;
1288         if (dev->netdev_ops->ndo_set_tx_maxrate)
1289                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1290
1291         rtnl_unlock();
1292         if (!err) {
1293                 queue->tx_maxrate = rate;
1294                 return len;
1295         }
1296         return err;
1297 }
1298
1299 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1300         = __ATTR_RW(tx_maxrate);
1301 #endif
1302
1303 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1304         = __ATTR_RO(tx_timeout);
1305
1306 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1307         = __ATTR_RO(traffic_class);
1308
1309 #ifdef CONFIG_BQL
1310 /*
1311  * Byte queue limits sysfs structures and functions.
1312  */
1313 static ssize_t bql_show(char *buf, unsigned int value)
1314 {
1315         return sprintf(buf, "%u\n", value);
1316 }
1317
1318 static ssize_t bql_set(const char *buf, const size_t count,
1319                        unsigned int *pvalue)
1320 {
1321         unsigned int value;
1322         int err;
1323
1324         if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1325                 value = DQL_MAX_LIMIT;
1326         } else {
1327                 err = kstrtouint(buf, 10, &value);
1328                 if (err < 0)
1329                         return err;
1330                 if (value > DQL_MAX_LIMIT)
1331                         return -EINVAL;
1332         }
1333
1334         *pvalue = value;
1335
1336         return count;
1337 }
1338
1339 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1340                                   char *buf)
1341 {
1342         struct dql *dql = &queue->dql;
1343
1344         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1345 }
1346
1347 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1348                                  const char *buf, size_t len)
1349 {
1350         struct dql *dql = &queue->dql;
1351         unsigned int value;
1352         int err;
1353
1354         err = kstrtouint(buf, 10, &value);
1355         if (err < 0)
1356                 return err;
1357
1358         dql->slack_hold_time = msecs_to_jiffies(value);
1359
1360         return len;
1361 }
1362
1363 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1364         = __ATTR(hold_time, 0644,
1365                  bql_show_hold_time, bql_set_hold_time);
1366
1367 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1368                                  char *buf)
1369 {
1370         struct dql *dql = &queue->dql;
1371
1372         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1373 }
1374
1375 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1376         __ATTR(inflight, 0444, bql_show_inflight, NULL);
1377
1378 #define BQL_ATTR(NAME, FIELD)                                           \
1379 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1380                                  char *buf)                             \
1381 {                                                                       \
1382         return bql_show(buf, queue->dql.FIELD);                         \
1383 }                                                                       \
1384                                                                         \
1385 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1386                                 const char *buf, size_t len)            \
1387 {                                                                       \
1388         return bql_set(buf, len, &queue->dql.FIELD);                    \
1389 }                                                                       \
1390                                                                         \
1391 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1392         = __ATTR(NAME, 0644,                            \
1393                  bql_show_ ## NAME, bql_set_ ## NAME)
1394
1395 BQL_ATTR(limit, limit);
1396 BQL_ATTR(limit_max, max_limit);
1397 BQL_ATTR(limit_min, min_limit);
1398
1399 static struct attribute *dql_attrs[] __ro_after_init = {
1400         &bql_limit_attribute.attr,
1401         &bql_limit_max_attribute.attr,
1402         &bql_limit_min_attribute.attr,
1403         &bql_hold_time_attribute.attr,
1404         &bql_inflight_attribute.attr,
1405         NULL
1406 };
1407
1408 static const struct attribute_group dql_group = {
1409         .name  = "byte_queue_limits",
1410         .attrs  = dql_attrs,
1411 };
1412 #endif /* CONFIG_BQL */
1413
1414 #ifdef CONFIG_XPS
1415 static ssize_t xps_queue_show(struct net_device *dev, unsigned int index,
1416                               int tc, char *buf, enum xps_map_type type)
1417 {
1418         struct xps_dev_maps *dev_maps;
1419         unsigned long *mask;
1420         unsigned int nr_ids;
1421         int j, len;
1422
1423         rcu_read_lock();
1424         dev_maps = rcu_dereference(dev->xps_maps[type]);
1425
1426         /* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0
1427          * when dev_maps hasn't been allocated yet, to be backward compatible.
1428          */
1429         nr_ids = dev_maps ? dev_maps->nr_ids :
1430                  (type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues);
1431
1432         mask = bitmap_zalloc(nr_ids, GFP_NOWAIT);
1433         if (!mask) {
1434                 rcu_read_unlock();
1435                 return -ENOMEM;
1436         }
1437
1438         if (!dev_maps || tc >= dev_maps->num_tc)
1439                 goto out_no_maps;
1440
1441         for (j = 0; j < nr_ids; j++) {
1442                 int i, tci = j * dev_maps->num_tc + tc;
1443                 struct xps_map *map;
1444
1445                 map = rcu_dereference(dev_maps->attr_map[tci]);
1446                 if (!map)
1447                         continue;
1448
1449                 for (i = map->len; i--;) {
1450                         if (map->queues[i] == index) {
1451                                 set_bit(j, mask);
1452                                 break;
1453                         }
1454                 }
1455         }
1456 out_no_maps:
1457         rcu_read_unlock();
1458
1459         len = bitmap_print_to_pagebuf(false, buf, mask, nr_ids);
1460         bitmap_free(mask);
1461
1462         return len < PAGE_SIZE ? len : -EINVAL;
1463 }
1464
1465 static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf)
1466 {
1467         struct net_device *dev = queue->dev;
1468         unsigned int index;
1469         int len, tc;
1470
1471         if (!netif_is_multiqueue(dev))
1472                 return -ENOENT;
1473
1474         index = get_netdev_queue_index(queue);
1475
1476         if (!rtnl_trylock())
1477                 return restart_syscall();
1478
1479         /* If queue belongs to subordinate dev use its map */
1480         dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1481
1482         tc = netdev_txq_to_tc(dev, index);
1483         if (tc < 0) {
1484                 rtnl_unlock();
1485                 return -EINVAL;
1486         }
1487
1488         /* Make sure the subordinate device can't be freed */
1489         get_device(&dev->dev);
1490         rtnl_unlock();
1491
1492         len = xps_queue_show(dev, index, tc, buf, XPS_CPUS);
1493
1494         put_device(&dev->dev);
1495         return len;
1496 }
1497
1498 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1499                               const char *buf, size_t len)
1500 {
1501         struct net_device *dev = queue->dev;
1502         unsigned int index;
1503         cpumask_var_t mask;
1504         int err;
1505
1506         if (!netif_is_multiqueue(dev))
1507                 return -ENOENT;
1508
1509         if (!capable(CAP_NET_ADMIN))
1510                 return -EPERM;
1511
1512         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1513                 return -ENOMEM;
1514
1515         index = get_netdev_queue_index(queue);
1516
1517         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1518         if (err) {
1519                 free_cpumask_var(mask);
1520                 return err;
1521         }
1522
1523         if (!rtnl_trylock()) {
1524                 free_cpumask_var(mask);
1525                 return restart_syscall();
1526         }
1527
1528         err = netif_set_xps_queue(dev, mask, index);
1529         rtnl_unlock();
1530
1531         free_cpumask_var(mask);
1532
1533         return err ? : len;
1534 }
1535
1536 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1537         = __ATTR_RW(xps_cpus);
1538
1539 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1540 {
1541         struct net_device *dev = queue->dev;
1542         unsigned int index;
1543         int tc;
1544
1545         index = get_netdev_queue_index(queue);
1546
1547         if (!rtnl_trylock())
1548                 return restart_syscall();
1549
1550         tc = netdev_txq_to_tc(dev, index);
1551         rtnl_unlock();
1552         if (tc < 0)
1553                 return -EINVAL;
1554
1555         return xps_queue_show(dev, index, tc, buf, XPS_RXQS);
1556 }
1557
1558 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1559                               size_t len)
1560 {
1561         struct net_device *dev = queue->dev;
1562         struct net *net = dev_net(dev);
1563         unsigned long *mask;
1564         unsigned int index;
1565         int err;
1566
1567         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1568                 return -EPERM;
1569
1570         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1571         if (!mask)
1572                 return -ENOMEM;
1573
1574         index = get_netdev_queue_index(queue);
1575
1576         err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1577         if (err) {
1578                 bitmap_free(mask);
1579                 return err;
1580         }
1581
1582         if (!rtnl_trylock()) {
1583                 bitmap_free(mask);
1584                 return restart_syscall();
1585         }
1586
1587         cpus_read_lock();
1588         err = __netif_set_xps_queue(dev, mask, index, XPS_RXQS);
1589         cpus_read_unlock();
1590
1591         rtnl_unlock();
1592
1593         bitmap_free(mask);
1594         return err ? : len;
1595 }
1596
1597 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1598         = __ATTR_RW(xps_rxqs);
1599 #endif /* CONFIG_XPS */
1600
1601 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1602         &queue_trans_timeout.attr,
1603         &queue_traffic_class.attr,
1604 #ifdef CONFIG_XPS
1605         &xps_cpus_attribute.attr,
1606         &xps_rxqs_attribute.attr,
1607         &queue_tx_maxrate.attr,
1608 #endif
1609         NULL
1610 };
1611 ATTRIBUTE_GROUPS(netdev_queue_default);
1612
1613 static void netdev_queue_release(struct kobject *kobj)
1614 {
1615         struct netdev_queue *queue = to_netdev_queue(kobj);
1616
1617         memset(kobj, 0, sizeof(*kobj));
1618         dev_put(queue->dev);
1619 }
1620
1621 static const void *netdev_queue_namespace(struct kobject *kobj)
1622 {
1623         struct netdev_queue *queue = to_netdev_queue(kobj);
1624         struct device *dev = &queue->dev->dev;
1625         const void *ns = NULL;
1626
1627         if (dev->class && dev->class->ns_type)
1628                 ns = dev->class->namespace(dev);
1629
1630         return ns;
1631 }
1632
1633 static void netdev_queue_get_ownership(struct kobject *kobj,
1634                                        kuid_t *uid, kgid_t *gid)
1635 {
1636         const struct net *net = netdev_queue_namespace(kobj);
1637
1638         net_ns_get_ownership(net, uid, gid);
1639 }
1640
1641 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1642         .sysfs_ops = &netdev_queue_sysfs_ops,
1643         .release = netdev_queue_release,
1644         .default_groups = netdev_queue_default_groups,
1645         .namespace = netdev_queue_namespace,
1646         .get_ownership = netdev_queue_get_ownership,
1647 };
1648
1649 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1650 {
1651         struct netdev_queue *queue = dev->_tx + index;
1652         struct kobject *kobj = &queue->kobj;
1653         int error = 0;
1654
1655         /* Kobject_put later will trigger netdev_queue_release call
1656          * which decreases dev refcount: Take that reference here
1657          */
1658         dev_hold(queue->dev);
1659
1660         kobj->kset = dev->queues_kset;
1661         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1662                                      "tx-%u", index);
1663         if (error)
1664                 goto err;
1665
1666 #ifdef CONFIG_BQL
1667         error = sysfs_create_group(kobj, &dql_group);
1668         if (error)
1669                 goto err;
1670 #endif
1671
1672         kobject_uevent(kobj, KOBJ_ADD);
1673         return 0;
1674
1675 err:
1676         kobject_put(kobj);
1677         return error;
1678 }
1679
1680 static int tx_queue_change_owner(struct net_device *ndev, int index,
1681                                  kuid_t kuid, kgid_t kgid)
1682 {
1683         struct netdev_queue *queue = ndev->_tx + index;
1684         struct kobject *kobj = &queue->kobj;
1685         int error;
1686
1687         error = sysfs_change_owner(kobj, kuid, kgid);
1688         if (error)
1689                 return error;
1690
1691 #ifdef CONFIG_BQL
1692         error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
1693 #endif
1694         return error;
1695 }
1696 #endif /* CONFIG_SYSFS */
1697
1698 int
1699 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1700 {
1701 #ifdef CONFIG_SYSFS
1702         int i;
1703         int error = 0;
1704
1705         for (i = old_num; i < new_num; i++) {
1706                 error = netdev_queue_add_kobject(dev, i);
1707                 if (error) {
1708                         new_num = old_num;
1709                         break;
1710                 }
1711         }
1712
1713         while (--i >= new_num) {
1714                 struct netdev_queue *queue = dev->_tx + i;
1715
1716                 if (!refcount_read(&dev_net(dev)->ns.count))
1717                         queue->kobj.uevent_suppress = 1;
1718 #ifdef CONFIG_BQL
1719                 sysfs_remove_group(&queue->kobj, &dql_group);
1720 #endif
1721                 kobject_put(&queue->kobj);
1722         }
1723
1724         return error;
1725 #else
1726         return 0;
1727 #endif /* CONFIG_SYSFS */
1728 }
1729
1730 static int net_tx_queue_change_owner(struct net_device *dev, int num,
1731                                      kuid_t kuid, kgid_t kgid)
1732 {
1733 #ifdef CONFIG_SYSFS
1734         int error = 0;
1735         int i;
1736
1737         for (i = 0; i < num; i++) {
1738                 error = tx_queue_change_owner(dev, i, kuid, kgid);
1739                 if (error)
1740                         break;
1741         }
1742
1743         return error;
1744 #else
1745         return 0;
1746 #endif /* CONFIG_SYSFS */
1747 }
1748
1749 static int register_queue_kobjects(struct net_device *dev)
1750 {
1751         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1752
1753 #ifdef CONFIG_SYSFS
1754         dev->queues_kset = kset_create_and_add("queues",
1755                                                NULL, &dev->dev.kobj);
1756         if (!dev->queues_kset)
1757                 return -ENOMEM;
1758         real_rx = dev->real_num_rx_queues;
1759 #endif
1760         real_tx = dev->real_num_tx_queues;
1761
1762         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1763         if (error)
1764                 goto error;
1765         rxq = real_rx;
1766
1767         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1768         if (error)
1769                 goto error;
1770         txq = real_tx;
1771
1772         return 0;
1773
1774 error:
1775         netdev_queue_update_kobjects(dev, txq, 0);
1776         net_rx_queue_update_kobjects(dev, rxq, 0);
1777 #ifdef CONFIG_SYSFS
1778         kset_unregister(dev->queues_kset);
1779 #endif
1780         return error;
1781 }
1782
1783 static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
1784 {
1785         int error = 0, real_rx = 0, real_tx = 0;
1786
1787 #ifdef CONFIG_SYSFS
1788         if (ndev->queues_kset) {
1789                 error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
1790                 if (error)
1791                         return error;
1792         }
1793         real_rx = ndev->real_num_rx_queues;
1794 #endif
1795         real_tx = ndev->real_num_tx_queues;
1796
1797         error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
1798         if (error)
1799                 return error;
1800
1801         error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
1802         if (error)
1803                 return error;
1804
1805         return 0;
1806 }
1807
1808 static void remove_queue_kobjects(struct net_device *dev)
1809 {
1810         int real_rx = 0, real_tx = 0;
1811
1812 #ifdef CONFIG_SYSFS
1813         real_rx = dev->real_num_rx_queues;
1814 #endif
1815         real_tx = dev->real_num_tx_queues;
1816
1817         net_rx_queue_update_kobjects(dev, real_rx, 0);
1818         netdev_queue_update_kobjects(dev, real_tx, 0);
1819 #ifdef CONFIG_SYSFS
1820         kset_unregister(dev->queues_kset);
1821 #endif
1822 }
1823
1824 static bool net_current_may_mount(void)
1825 {
1826         struct net *net = current->nsproxy->net_ns;
1827
1828         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1829 }
1830
1831 static void *net_grab_current_ns(void)
1832 {
1833         struct net *ns = current->nsproxy->net_ns;
1834 #ifdef CONFIG_NET_NS
1835         if (ns)
1836                 refcount_inc(&ns->passive);
1837 #endif
1838         return ns;
1839 }
1840
1841 static const void *net_initial_ns(void)
1842 {
1843         return &init_net;
1844 }
1845
1846 static const void *net_netlink_ns(struct sock *sk)
1847 {
1848         return sock_net(sk);
1849 }
1850
1851 const struct kobj_ns_type_operations net_ns_type_operations = {
1852         .type = KOBJ_NS_TYPE_NET,
1853         .current_may_mount = net_current_may_mount,
1854         .grab_current_ns = net_grab_current_ns,
1855         .netlink_ns = net_netlink_ns,
1856         .initial_ns = net_initial_ns,
1857         .drop_ns = net_drop_ns,
1858 };
1859 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1860
1861 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1862 {
1863         struct net_device *dev = to_net_dev(d);
1864         int retval;
1865
1866         /* pass interface to uevent. */
1867         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1868         if (retval)
1869                 goto exit;
1870
1871         /* pass ifindex to uevent.
1872          * ifindex is useful as it won't change (interface name may change)
1873          * and is what RtNetlink uses natively.
1874          */
1875         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1876
1877 exit:
1878         return retval;
1879 }
1880
1881 /*
1882  *      netdev_release -- destroy and free a dead device.
1883  *      Called when last reference to device kobject is gone.
1884  */
1885 static void netdev_release(struct device *d)
1886 {
1887         struct net_device *dev = to_net_dev(d);
1888
1889         BUG_ON(dev->reg_state != NETREG_RELEASED);
1890
1891         /* no need to wait for rcu grace period:
1892          * device is dead and about to be freed.
1893          */
1894         kfree(rcu_access_pointer(dev->ifalias));
1895         netdev_freemem(dev);
1896 }
1897
1898 static const void *net_namespace(struct device *d)
1899 {
1900         struct net_device *dev = to_net_dev(d);
1901
1902         return dev_net(dev);
1903 }
1904
1905 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1906 {
1907         struct net_device *dev = to_net_dev(d);
1908         const struct net *net = dev_net(dev);
1909
1910         net_ns_get_ownership(net, uid, gid);
1911 }
1912
1913 static struct class net_class __ro_after_init = {
1914         .name = "net",
1915         .dev_release = netdev_release,
1916         .dev_groups = net_class_groups,
1917         .dev_uevent = netdev_uevent,
1918         .ns_type = &net_ns_type_operations,
1919         .namespace = net_namespace,
1920         .get_ownership = net_get_ownership,
1921 };
1922
1923 #ifdef CONFIG_OF
1924 static int of_dev_node_match(struct device *dev, const void *data)
1925 {
1926         for (; dev; dev = dev->parent) {
1927                 if (dev->of_node == data)
1928                         return 1;
1929         }
1930
1931         return 0;
1932 }
1933
1934 /*
1935  * of_find_net_device_by_node - lookup the net device for the device node
1936  * @np: OF device node
1937  *
1938  * Looks up the net_device structure corresponding with the device node.
1939  * If successful, returns a pointer to the net_device with the embedded
1940  * struct device refcount incremented by one, or NULL on failure. The
1941  * refcount must be dropped when done with the net_device.
1942  */
1943 struct net_device *of_find_net_device_by_node(struct device_node *np)
1944 {
1945         struct device *dev;
1946
1947         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1948         if (!dev)
1949                 return NULL;
1950
1951         return to_net_dev(dev);
1952 }
1953 EXPORT_SYMBOL(of_find_net_device_by_node);
1954 #endif
1955
1956 /* Delete sysfs entries but hold kobject reference until after all
1957  * netdev references are gone.
1958  */
1959 void netdev_unregister_kobject(struct net_device *ndev)
1960 {
1961         struct device *dev = &ndev->dev;
1962
1963         if (!refcount_read(&dev_net(ndev)->ns.count))
1964                 dev_set_uevent_suppress(dev, 1);
1965
1966         kobject_get(&dev->kobj);
1967
1968         remove_queue_kobjects(ndev);
1969
1970         pm_runtime_set_memalloc_noio(dev, false);
1971
1972         device_del(dev);
1973 }
1974
1975 /* Create sysfs entries for network device. */
1976 int netdev_register_kobject(struct net_device *ndev)
1977 {
1978         struct device *dev = &ndev->dev;
1979         const struct attribute_group **groups = ndev->sysfs_groups;
1980         int error = 0;
1981
1982         device_initialize(dev);
1983         dev->class = &net_class;
1984         dev->platform_data = ndev;
1985         dev->groups = groups;
1986
1987         dev_set_name(dev, "%s", ndev->name);
1988
1989 #ifdef CONFIG_SYSFS
1990         /* Allow for a device specific group */
1991         if (*groups)
1992                 groups++;
1993
1994         *groups++ = &netstat_group;
1995
1996 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1997         if (ndev->ieee80211_ptr)
1998                 *groups++ = &wireless_group;
1999 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
2000         else if (ndev->wireless_handlers)
2001                 *groups++ = &wireless_group;
2002 #endif
2003 #endif
2004 #endif /* CONFIG_SYSFS */
2005
2006         error = device_add(dev);
2007         if (error)
2008                 return error;
2009
2010         error = register_queue_kobjects(ndev);
2011         if (error) {
2012                 device_del(dev);
2013                 return error;
2014         }
2015
2016         pm_runtime_set_memalloc_noio(dev, true);
2017
2018         return error;
2019 }
2020
2021 /* Change owner for sysfs entries when moving network devices across network
2022  * namespaces owned by different user namespaces.
2023  */
2024 int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
2025                         const struct net *net_new)
2026 {
2027         kuid_t old_uid = GLOBAL_ROOT_UID, new_uid = GLOBAL_ROOT_UID;
2028         kgid_t old_gid = GLOBAL_ROOT_GID, new_gid = GLOBAL_ROOT_GID;
2029         struct device *dev = &ndev->dev;
2030         int error;
2031
2032         net_ns_get_ownership(net_old, &old_uid, &old_gid);
2033         net_ns_get_ownership(net_new, &new_uid, &new_gid);
2034
2035         /* The network namespace was changed but the owning user namespace is
2036          * identical so there's no need to change the owner of sysfs entries.
2037          */
2038         if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
2039                 return 0;
2040
2041         error = device_change_owner(dev, new_uid, new_gid);
2042         if (error)
2043                 return error;
2044
2045         error = queue_change_owner(ndev, new_uid, new_gid);
2046         if (error)
2047                 return error;
2048
2049         return 0;
2050 }
2051
2052 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
2053                                 const void *ns)
2054 {
2055         return class_create_file_ns(&net_class, class_attr, ns);
2056 }
2057 EXPORT_SYMBOL(netdev_class_create_file_ns);
2058
2059 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
2060                                  const void *ns)
2061 {
2062         class_remove_file_ns(&net_class, class_attr, ns);
2063 }
2064 EXPORT_SYMBOL(netdev_class_remove_file_ns);
2065
2066 int __init netdev_kobject_init(void)
2067 {
2068         kobj_ns_type_register(&net_ns_type_operations);
2069         return class_register(&net_class);
2070 }