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) && netif_device_present(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 struct attribute *net_class_attrs[] __ro_after_init = {
 591         &dev_attr_netdev_group.attr,
 592         &dev_attr_type.attr,
 593         &dev_attr_dev_id.attr,
 594         &dev_attr_dev_port.attr,
 595         &dev_attr_iflink.attr,
 596         &dev_attr_ifindex.attr,
 597         &dev_attr_name_assign_type.attr,
 598         &dev_attr_addr_assign_type.attr,
 599         &dev_attr_addr_len.attr,
 600         &dev_attr_link_mode.attr,
 601         &dev_attr_address.attr,
 602         &dev_attr_broadcast.attr,
 603         &dev_attr_speed.attr,
 604         &dev_attr_duplex.attr,
 605         &dev_attr_dormant.attr,
 606         &dev_attr_testing.attr,
 607         &dev_attr_operstate.attr,
 608         &dev_attr_carrier_changes.attr,
 609         &dev_attr_ifalias.attr,
 610         &dev_attr_carrier.attr,
 611         &dev_attr_mtu.attr,
 612         &dev_attr_flags.attr,
 613         &dev_attr_tx_queue_len.attr,
 614         &dev_attr_gro_flush_timeout.attr,
 615         &dev_attr_napi_defer_hard_irqs.attr,
 616         &dev_attr_phys_port_id.attr,
 617         &dev_attr_phys_port_name.attr,
 618         &dev_attr_phys_switch_id.attr,
 619         &dev_attr_proto_down.attr,
 620         &dev_attr_carrier_up_count.attr,
 621         &dev_attr_carrier_down_count.attr,
 622         NULL,
 623 };
 624 ATTRIBUTE_GROUPS(net_class);
 625
 626 /* Show a given an attribute in the statistics group */
 627 static ssize_t netstat_show(const struct device *d,
 628                             struct device_attribute *attr, char *buf,
 629                             unsigned long offset)
 630 {
 631         struct net_device *dev = to_net_dev(d);
 632         ssize_t ret = -EINVAL;
 633
 634         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 635                 offset % sizeof(u64) != 0);
 636
 637         read_lock(&dev_base_lock);
 638         if (dev_isalive(dev)) {
 639                 struct rtnl_link_stats64 temp;
 640                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 641
 642                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
 643         }
 644         read_unlock(&dev_base_lock);
 645         return ret;
 646 }
 647
 648 /* generate a read-only statistics attribute */
 649 #define NETSTAT_ENTRY(name)                                             \
 650 static ssize_t name##_show(struct device *d,                            \
 651                            struct device_attribute *attr, char *buf)    \
 652 {                                                                       \
 653         return netstat_show(d, attr, buf,                               \
 654                             offsetof(struct rtnl_link_stats64, name));  \
 655 }                                                                       \
 656 static DEVICE_ATTR_RO(name)
 657
 658 NETSTAT_ENTRY(rx_packets);
 659 NETSTAT_ENTRY(tx_packets);
 660 NETSTAT_ENTRY(rx_bytes);
 661 NETSTAT_ENTRY(tx_bytes);
 662 NETSTAT_ENTRY(rx_errors);
 663 NETSTAT_ENTRY(tx_errors);
 664 NETSTAT_ENTRY(rx_dropped);
 665 NETSTAT_ENTRY(tx_dropped);
 666 NETSTAT_ENTRY(multicast);
 667 NETSTAT_ENTRY(collisions);
 668 NETSTAT_ENTRY(rx_length_errors);
 669 NETSTAT_ENTRY(rx_over_errors);
 670 NETSTAT_ENTRY(rx_crc_errors);
 671 NETSTAT_ENTRY(rx_frame_errors);
 672 NETSTAT_ENTRY(rx_fifo_errors);
 673 NETSTAT_ENTRY(rx_missed_errors);
 674 NETSTAT_ENTRY(tx_aborted_errors);
 675 NETSTAT_ENTRY(tx_carrier_errors);
 676 NETSTAT_ENTRY(tx_fifo_errors);
 677 NETSTAT_ENTRY(tx_heartbeat_errors);
 678 NETSTAT_ENTRY(tx_window_errors);
 679 NETSTAT_ENTRY(rx_compressed);
 680 NETSTAT_ENTRY(tx_compressed);
 681 NETSTAT_ENTRY(rx_nohandler);
 682
 683 static struct attribute *netstat_attrs[] __ro_after_init = {
 684         &dev_attr_rx_packets.attr,
 685         &dev_attr_tx_packets.attr,
 686         &dev_attr_rx_bytes.attr,
 687         &dev_attr_tx_bytes.attr,
 688         &dev_attr_rx_errors.attr,
 689         &dev_attr_tx_errors.attr,
 690         &dev_attr_rx_dropped.attr,
 691         &dev_attr_tx_dropped.attr,
 692         &dev_attr_multicast.attr,
 693         &dev_attr_collisions.attr,
 694         &dev_attr_rx_length_errors.attr,
 695         &dev_attr_rx_over_errors.attr,
 696         &dev_attr_rx_crc_errors.attr,
 697         &dev_attr_rx_frame_errors.attr,
 698         &dev_attr_rx_fifo_errors.attr,
 699         &dev_attr_rx_missed_errors.attr,
 700         &dev_attr_tx_aborted_errors.attr,
 701         &dev_attr_tx_carrier_errors.attr,
 702         &dev_attr_tx_fifo_errors.attr,
 703         &dev_attr_tx_heartbeat_errors.attr,
 704         &dev_attr_tx_window_errors.attr,
 705         &dev_attr_rx_compressed.attr,
 706         &dev_attr_tx_compressed.attr,
 707         &dev_attr_rx_nohandler.attr,
 708         NULL
 709 };
 710
 711 static const struct attribute_group netstat_group = {
 712         .name  = "statistics",
 713         .attrs  = netstat_attrs,
 714 };
 715
 716 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 717 static struct attribute *wireless_attrs[] = {
 718         NULL
 719 };
 720
 721 static const struct attribute_group wireless_group = {
 722         .name = "wireless",
 723         .attrs = wireless_attrs,
 724 };
 725 #endif
 726
 727 #else /* CONFIG_SYSFS */
 728 #define net_class_groups        NULL
 729 #endif /* CONFIG_SYSFS */
 730
 731 #ifdef CONFIG_SYSFS
 732 #define to_rx_queue_attr(_attr) \
 733         container_of(_attr, struct rx_queue_attribute, attr)
 734
 735 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 736
 737 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 738                                   char *buf)
 739 {
 740         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 741         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 742
 743         if (!attribute->show)
 744                 return -EIO;
 745
 746         return attribute->show(queue, buf);
 747 }
 748
 749 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 750                                    const char *buf, size_t count)
 751 {
 752         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 753         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 754
 755         if (!attribute->store)
 756                 return -EIO;
 757
 758         return attribute->store(queue, buf, count);
 759 }
 760
 761 static const struct sysfs_ops rx_queue_sysfs_ops = {
 762         .show = rx_queue_attr_show,
 763         .store = rx_queue_attr_store,
 764 };
 765
 766 #ifdef CONFIG_RPS
 767 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
 768 {
 769         struct rps_map *map;
 770         cpumask_var_t mask;
 771         int i, len;
 772
 773         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 774                 return -ENOMEM;
 775
 776         rcu_read_lock();
 777         map = rcu_dereference(queue->rps_map);
 778         if (map)
 779                 for (i = 0; i < map->len; i++)
 780                         cpumask_set_cpu(map->cpus[i], mask);
 781
 782         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 783         rcu_read_unlock();
 784         free_cpumask_var(mask);
 785
 786         return len < PAGE_SIZE ? len : -EINVAL;
 787 }
 788
 789 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 790                              const char *buf, size_t len)
 791 {
 792         struct rps_map *old_map, *map;
 793         cpumask_var_t mask;
 794         int err, cpu, i, hk_flags;
 795         static DEFINE_MUTEX(rps_map_mutex);
 796
 797         if (!capable(CAP_NET_ADMIN))
 798                 return -EPERM;
 799
 800         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 801                 return -ENOMEM;
 802
 803         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 804         if (err) {
 805                 free_cpumask_var(mask);
 806                 return err;
 807         }
 808
 809         if (!cpumask_empty(mask)) {
 810                 hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
 811                 cpumask_and(mask, mask, housekeeping_cpumask(hk_flags));
 812                 if (cpumask_empty(mask)) {
 813                         free_cpumask_var(mask);
 814                         return -EINVAL;
 815                 }
 816         }
 817
 818         map = kzalloc(max_t(unsigned int,
 819                             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 820                       GFP_KERNEL);
 821         if (!map) {
 822                 free_cpumask_var(mask);
 823                 return -ENOMEM;
 824         }
 825
 826         i = 0;
 827         for_each_cpu_and(cpu, mask, cpu_online_mask)
 828                 map->cpus[i++] = cpu;
 829
 830         if (i) {
 831                 map->len = i;
 832         } else {
 833                 kfree(map);
 834                 map = NULL;
 835         }
 836
 837         mutex_lock(&rps_map_mutex);
 838         old_map = rcu_dereference_protected(queue->rps_map,
 839                                             mutex_is_locked(&rps_map_mutex));
 840         rcu_assign_pointer(queue->rps_map, map);
 841
 842         if (map)
 843                 static_branch_inc(&rps_needed);
 844         if (old_map)
 845                 static_branch_dec(&rps_needed);
 846
 847         mutex_unlock(&rps_map_mutex);
 848
 849         if (old_map)
 850                 kfree_rcu(old_map, rcu);
 851
 852         free_cpumask_var(mask);
 853         return len;
 854 }
 855
 856 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 857                                            char *buf)
 858 {
 859         struct rps_dev_flow_table *flow_table;
 860         unsigned long val = 0;
 861
 862         rcu_read_lock();
 863         flow_table = rcu_dereference(queue->rps_flow_table);
 864         if (flow_table)
 865                 val = (unsigned long)flow_table->mask + 1;
 866         rcu_read_unlock();
 867
 868         return sprintf(buf, "%lu\n", val);
 869 }
 870
 871 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 872 {
 873         struct rps_dev_flow_table *table = container_of(rcu,
 874             struct rps_dev_flow_table, rcu);
 875         vfree(table);
 876 }
 877
 878 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 879                                             const char *buf, size_t len)
 880 {
 881         unsigned long mask, count;
 882         struct rps_dev_flow_table *table, *old_table;
 883         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 884         int rc;
 885
 886         if (!capable(CAP_NET_ADMIN))
 887                 return -EPERM;
 888
 889         rc = kstrtoul(buf, 0, &count);
 890         if (rc < 0)
 891                 return rc;
 892
 893         if (count) {
 894                 mask = count - 1;
 895                 /* mask = roundup_pow_of_two(count) - 1;
 896                  * without overflows...
 897                  */
 898                 while ((mask | (mask >> 1)) != mask)
 899                         mask |= (mask >> 1);
 900                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 901                  * and on 32bit arches, must check
 902                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 903                  */
 904 #if BITS_PER_LONG > 32
 905                 if (mask > (unsigned long)(u32)mask)
 906                         return -EINVAL;
 907 #else
 908                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 909                                 / sizeof(struct rps_dev_flow)) {
 910                         /* Enforce a limit to prevent overflow */
 911                         return -EINVAL;
 912                 }
 913 #endif
 914                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 915                 if (!table)
 916                         return -ENOMEM;
 917
 918                 table->mask = mask;
 919                 for (count = 0; count <= mask; count++)
 920                         table->flows[count].cpu = RPS_NO_CPU;
 921         } else {
 922                 table = NULL;
 923         }
 924
 925         spin_lock(&rps_dev_flow_lock);
 926         old_table = rcu_dereference_protected(queue->rps_flow_table,
 927                                               lockdep_is_held(&rps_dev_flow_lock));
 928         rcu_assign_pointer(queue->rps_flow_table, table);
 929         spin_unlock(&rps_dev_flow_lock);
 930
 931         if (old_table)
 932                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 933
 934         return len;
 935 }
 936
 937 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
 938         = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
 939
 940 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
 941         = __ATTR(rps_flow_cnt, 0644,
 942                  show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 943 #endif /* CONFIG_RPS */
 944
 945 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
 946 #ifdef CONFIG_RPS
 947         &rps_cpus_attribute.attr,
 948         &rps_dev_flow_table_cnt_attribute.attr,
 949 #endif
 950         NULL
 951 };
 952 ATTRIBUTE_GROUPS(rx_queue_default);
 953
 954 static void rx_queue_release(struct kobject *kobj)
 955 {
 956         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 957 #ifdef CONFIG_RPS
 958         struct rps_map *map;
 959         struct rps_dev_flow_table *flow_table;
 960
 961         map = rcu_dereference_protected(queue->rps_map, 1);
 962         if (map) {
 963                 RCU_INIT_POINTER(queue->rps_map, NULL);
 964                 kfree_rcu(map, rcu);
 965         }
 966
 967         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 968         if (flow_table) {
 969                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 970                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 971         }
 972 #endif
 973
 974         memset(kobj, 0, sizeof(*kobj));
 975         dev_put(queue->dev);
 976 }
 977
 978 static const void *rx_queue_namespace(struct kobject *kobj)
 979 {
 980         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 981         struct device *dev = &queue->dev->dev;
 982         const void *ns = NULL;
 983
 984         if (dev->class && dev->class->ns_type)
 985                 ns = dev->class->namespace(dev);
 986
 987         return ns;
 988 }
 989
 990 static void rx_queue_get_ownership(struct kobject *kobj,
 991                                    kuid_t *uid, kgid_t *gid)
 992 {
 993         const struct net *net = rx_queue_namespace(kobj);
 994
 995         net_ns_get_ownership(net, uid, gid);
 996 }
 997
 998 static struct kobj_type rx_queue_ktype __ro_after_init = {
 999         .sysfs_ops = &rx_queue_sysfs_ops,
1000         .release = rx_queue_release,
1001         .default_groups = rx_queue_default_groups,
1002         .namespace = rx_queue_namespace,
1003         .get_ownership = rx_queue_get_ownership,
1004 };
1005
1006 static int rx_queue_add_kobject(struct net_device *dev, int index)
1007 {
1008         struct netdev_rx_queue *queue = dev->_rx + index;
1009         struct kobject *kobj = &queue->kobj;
1010         int error = 0;
1011
1012         /* Kobject_put later will trigger rx_queue_release call which
1013          * decreases dev refcount: Take that reference here
1014          */
1015         dev_hold(queue->dev);
1016
1017         kobj->kset = dev->queues_kset;
1018         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
1019                                      "rx-%u", index);
1020         if (error)
1021                 goto err;
1022
1023         if (dev->sysfs_rx_queue_group) {
1024                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
1025                 if (error)
1026                         goto err;
1027         }
1028
1029         kobject_uevent(kobj, KOBJ_ADD);
1030
1031         return error;
1032
1033 err:
1034         kobject_put(kobj);
1035         return error;
1036 }
1037
1038 static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
1039                                  kgid_t kgid)
1040 {
1041         struct netdev_rx_queue *queue = dev->_rx + index;
1042         struct kobject *kobj = &queue->kobj;
1043         int error;
1044
1045         error = sysfs_change_owner(kobj, kuid, kgid);
1046         if (error)
1047                 return error;
1048
1049         if (dev->sysfs_rx_queue_group)
1050                 error = sysfs_group_change_owner(
1051                         kobj, dev->sysfs_rx_queue_group, kuid, kgid);
1052
1053         return error;
1054 }
1055 #endif /* CONFIG_SYSFS */
1056
1057 int
1058 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1059 {
1060 #ifdef CONFIG_SYSFS
1061         int i;
1062         int error = 0;
1063
1064 #ifndef CONFIG_RPS
1065         if (!dev->sysfs_rx_queue_group)
1066                 return 0;
1067 #endif
1068         for (i = old_num; i < new_num; i++) {
1069                 error = rx_queue_add_kobject(dev, i);
1070                 if (error) {
1071                         new_num = old_num;
1072                         break;
1073                 }
1074         }
1075
1076         while (--i >= new_num) {
1077                 struct kobject *kobj = &dev->_rx[i].kobj;
1078
1079                 if (!refcount_read(&dev_net(dev)->count))
1080                         kobj->uevent_suppress = 1;
1081                 if (dev->sysfs_rx_queue_group)
1082                         sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
1083                 kobject_put(kobj);
1084         }
1085
1086         return error;
1087 #else
1088         return 0;
1089 #endif
1090 }
1091
1092 static int net_rx_queue_change_owner(struct net_device *dev, int num,
1093                                      kuid_t kuid, kgid_t kgid)
1094 {
1095 #ifdef CONFIG_SYSFS
1096         int error = 0;
1097         int i;
1098
1099 #ifndef CONFIG_RPS
1100         if (!dev->sysfs_rx_queue_group)
1101                 return 0;
1102 #endif
1103         for (i = 0; i < num; i++) {
1104                 error = rx_queue_change_owner(dev, i, kuid, kgid);
1105                 if (error)
1106                         break;
1107         }
1108
1109         return error;
1110 #else
1111         return 0;
1112 #endif
1113 }
1114
1115 #ifdef CONFIG_SYSFS
1116 /*
1117  * netdev_queue sysfs structures and functions.
1118  */
1119 struct netdev_queue_attribute {
1120         struct attribute attr;
1121         ssize_t (*show)(struct netdev_queue *queue, char *buf);
1122         ssize_t (*store)(struct netdev_queue *queue,
1123                          const char *buf, size_t len);
1124 };
1125 #define to_netdev_queue_attr(_attr) \
1126         container_of(_attr, struct netdev_queue_attribute, attr)
1127
1128 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1129
1130 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1131                                       struct attribute *attr, char *buf)
1132 {
1133         const struct netdev_queue_attribute *attribute
1134                 = to_netdev_queue_attr(attr);
1135         struct netdev_queue *queue = to_netdev_queue(kobj);
1136
1137         if (!attribute->show)
1138                 return -EIO;
1139
1140         return attribute->show(queue, buf);
1141 }
1142
1143 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1144                                        struct attribute *attr,
1145                                        const char *buf, size_t count)
1146 {
1147         const struct netdev_queue_attribute *attribute
1148                 = to_netdev_queue_attr(attr);
1149         struct netdev_queue *queue = to_netdev_queue(kobj);
1150
1151         if (!attribute->store)
1152                 return -EIO;
1153
1154         return attribute->store(queue, buf, count);
1155 }
1156
1157 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1158         .show = netdev_queue_attr_show,
1159         .store = netdev_queue_attr_store,
1160 };
1161
1162 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1163 {
1164         unsigned long trans_timeout;
1165
1166         spin_lock_irq(&queue->_xmit_lock);
1167         trans_timeout = queue->trans_timeout;
1168         spin_unlock_irq(&queue->_xmit_lock);
1169
1170         return sprintf(buf, fmt_ulong, trans_timeout);
1171 }
1172
1173 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1174 {
1175         struct net_device *dev = queue->dev;
1176         unsigned int i;
1177
1178         i = queue - dev->_tx;
1179         BUG_ON(i >= dev->num_tx_queues);
1180
1181         return i;
1182 }
1183
1184 static ssize_t traffic_class_show(struct netdev_queue *queue,
1185                                   char *buf)
1186 {
1187         struct net_device *dev = queue->dev;
1188         int index;
1189         int tc;
1190
1191         if (!netif_is_multiqueue(dev))
1192                 return -ENOENT;
1193
1194         index = get_netdev_queue_index(queue);
1195
1196         /* If queue belongs to subordinate dev use its TC mapping */
1197         dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1198
1199         tc = netdev_txq_to_tc(dev, index);
1200         if (tc < 0)
1201                 return -EINVAL;
1202
1203         /* We can report the traffic class one of two ways:
1204          * Subordinate device traffic classes are reported with the traffic
1205          * class first, and then the subordinate class so for example TC0 on
1206          * subordinate device 2 will be reported as "0-2". If the queue
1207          * belongs to the root device it will be reported with just the
1208          * traffic class, so just "0" for TC 0 for example.
1209          */
1210         return dev->num_tc < 0 ? sprintf(buf, "%d%d\n", tc, dev->num_tc) :
1211                                  sprintf(buf, "%d\n", tc);
1212 }
1213
1214 #ifdef CONFIG_XPS
1215 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1216                                char *buf)
1217 {
1218         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1219 }
1220
1221 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1222                                 const char *buf, size_t len)
1223 {
1224         struct net_device *dev = queue->dev;
1225         int err, index = get_netdev_queue_index(queue);
1226         u32 rate = 0;
1227
1228         if (!capable(CAP_NET_ADMIN))
1229                 return -EPERM;
1230
1231         /* The check is also done later; this helps returning early without
1232          * hitting the trylock/restart below.
1233          */
1234         if (!dev->netdev_ops->ndo_set_tx_maxrate)
1235                 return -EOPNOTSUPP;
1236
1237         err = kstrtou32(buf, 10, &rate);
1238         if (err < 0)
1239                 return err;
1240
1241         if (!rtnl_trylock())
1242                 return restart_syscall();
1243
1244         err = -EOPNOTSUPP;
1245         if (dev->netdev_ops->ndo_set_tx_maxrate)
1246                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1247
1248         rtnl_unlock();
1249         if (!err) {
1250                 queue->tx_maxrate = rate;
1251                 return len;
1252         }
1253         return err;
1254 }
1255
1256 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1257         = __ATTR_RW(tx_maxrate);
1258 #endif
1259
1260 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1261         = __ATTR_RO(tx_timeout);
1262
1263 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1264         = __ATTR_RO(traffic_class);
1265
1266 #ifdef CONFIG_BQL
1267 /*
1268  * Byte queue limits sysfs structures and functions.
1269  */
1270 static ssize_t bql_show(char *buf, unsigned int value)
1271 {
1272         return sprintf(buf, "%u\n", value);
1273 }
1274
1275 static ssize_t bql_set(const char *buf, const size_t count,
1276                        unsigned int *pvalue)
1277 {
1278         unsigned int value;
1279         int err;
1280
1281         if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1282                 value = DQL_MAX_LIMIT;
1283         } else {
1284                 err = kstrtouint(buf, 10, &value);
1285                 if (err < 0)
1286                         return err;
1287                 if (value > DQL_MAX_LIMIT)
1288                         return -EINVAL;
1289         }
1290
1291         *pvalue = value;
1292
1293         return count;
1294 }
1295
1296 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1297                                   char *buf)
1298 {
1299         struct dql *dql = &queue->dql;
1300
1301         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1302 }
1303
1304 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1305                                  const char *buf, size_t len)
1306 {
1307         struct dql *dql = &queue->dql;
1308         unsigned int value;
1309         int err;
1310
1311         err = kstrtouint(buf, 10, &value);
1312         if (err < 0)
1313                 return err;
1314
1315         dql->slack_hold_time = msecs_to_jiffies(value);
1316
1317         return len;
1318 }
1319
1320 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1321         = __ATTR(hold_time, 0644,
1322                  bql_show_hold_time, bql_set_hold_time);
1323
1324 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1325                                  char *buf)
1326 {
1327         struct dql *dql = &queue->dql;
1328
1329         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1330 }
1331
1332 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1333         __ATTR(inflight, 0444, bql_show_inflight, NULL);
1334
1335 #define BQL_ATTR(NAME, FIELD)                                           \
1336 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1337                                  char *buf)                             \
1338 {                                                                       \
1339         return bql_show(buf, queue->dql.FIELD);                         \
1340 }                                                                       \
1341                                                                         \
1342 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1343                                 const char *buf, size_t len)            \
1344 {                                                                       \
1345         return bql_set(buf, len, &queue->dql.FIELD);                    \
1346 }                                                                       \
1347                                                                         \
1348 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1349         = __ATTR(NAME, 0644,                            \
1350                  bql_show_ ## NAME, bql_set_ ## NAME)
1351
1352 BQL_ATTR(limit, limit);
1353 BQL_ATTR(limit_max, max_limit);
1354 BQL_ATTR(limit_min, min_limit);
1355
1356 static struct attribute *dql_attrs[] __ro_after_init = {
1357         &bql_limit_attribute.attr,
1358         &bql_limit_max_attribute.attr,
1359         &bql_limit_min_attribute.attr,
1360         &bql_hold_time_attribute.attr,
1361         &bql_inflight_attribute.attr,
1362         NULL
1363 };
1364
1365 static const struct attribute_group dql_group = {
1366         .name  = "byte_queue_limits",
1367         .attrs  = dql_attrs,
1368 };
1369 #endif /* CONFIG_BQL */
1370
1371 #ifdef CONFIG_XPS
1372 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1373                              char *buf)
1374 {
1375         int cpu, len, ret, num_tc = 1, tc = 0;
1376         struct net_device *dev = queue->dev;
1377         struct xps_dev_maps *dev_maps;
1378         cpumask_var_t mask;
1379         unsigned long index;
1380
1381         if (!netif_is_multiqueue(dev))
1382                 return -ENOENT;
1383
1384         index = get_netdev_queue_index(queue);
1385
1386         if (!rtnl_trylock())
1387                 return restart_syscall();
1388
1389         if (dev->num_tc) {
1390                 /* Do not allow XPS on subordinate device directly */
1391                 num_tc = dev->num_tc;
1392                 if (num_tc < 0) {
1393                         ret = -EINVAL;
1394                         goto err_rtnl_unlock;
1395                 }
1396
1397                 /* If queue belongs to subordinate dev use its map */
1398                 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1399
1400                 tc = netdev_txq_to_tc(dev, index);
1401                 if (tc < 0) {
1402                         ret = -EINVAL;
1403                         goto err_rtnl_unlock;
1404                 }
1405         }
1406
1407         if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
1408                 ret = -ENOMEM;
1409                 goto err_rtnl_unlock;
1410         }
1411
1412         rcu_read_lock();
1413         dev_maps = rcu_dereference(dev->xps_cpus_map);
1414         if (dev_maps) {
1415                 for_each_possible_cpu(cpu) {
1416                         int i, tci = cpu * num_tc + tc;
1417                         struct xps_map *map;
1418
1419                         map = rcu_dereference(dev_maps->attr_map[tci]);
1420                         if (!map)
1421                                 continue;
1422
1423                         for (i = map->len; i--;) {
1424                                 if (map->queues[i] == index) {
1425                                         cpumask_set_cpu(cpu, mask);
1426                                         break;
1427                                 }
1428                         }
1429                 }
1430         }
1431         rcu_read_unlock();
1432
1433         rtnl_unlock();
1434
1435         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1436         free_cpumask_var(mask);
1437         return len < PAGE_SIZE ? len : -EINVAL;
1438
1439 err_rtnl_unlock:
1440         rtnl_unlock();
1441         return ret;
1442 }
1443
1444 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1445                               const char *buf, size_t len)
1446 {
1447         struct net_device *dev = queue->dev;
1448         unsigned long index;
1449         cpumask_var_t mask;
1450         int err;
1451
1452         if (!netif_is_multiqueue(dev))
1453                 return -ENOENT;
1454
1455         if (!capable(CAP_NET_ADMIN))
1456                 return -EPERM;
1457
1458         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1459                 return -ENOMEM;
1460
1461         index = get_netdev_queue_index(queue);
1462
1463         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1464         if (err) {
1465                 free_cpumask_var(mask);
1466                 return err;
1467         }
1468
1469         if (!rtnl_trylock()) {
1470                 free_cpumask_var(mask);
1471                 return restart_syscall();
1472         }
1473
1474         err = netif_set_xps_queue(dev, mask, index);
1475         rtnl_unlock();
1476
1477         free_cpumask_var(mask);
1478
1479         return err ? : len;
1480 }
1481
1482 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1483         = __ATTR_RW(xps_cpus);
1484
1485 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1486 {
1487         int j, len, ret, num_tc = 1, tc = 0;
1488         struct net_device *dev = queue->dev;
1489         struct xps_dev_maps *dev_maps;
1490         unsigned long *mask, index;
1491
1492         index = get_netdev_queue_index(queue);
1493
1494         if (!rtnl_trylock())
1495                 return restart_syscall();
1496
1497         if (dev->num_tc) {
1498                 num_tc = dev->num_tc;
1499                 tc = netdev_txq_to_tc(dev, index);
1500                 if (tc < 0) {
1501                         ret = -EINVAL;
1502                         goto err_rtnl_unlock;
1503                 }
1504         }
1505         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1506         if (!mask) {
1507                 ret = -ENOMEM;
1508                 goto err_rtnl_unlock;
1509         }
1510
1511         rcu_read_lock();
1512         dev_maps = rcu_dereference(dev->xps_rxqs_map);
1513         if (!dev_maps)
1514                 goto out_no_maps;
1515
1516         for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1517              j < dev->num_rx_queues;) {
1518                 int i, tci = j * num_tc + tc;
1519                 struct xps_map *map;
1520
1521                 map = rcu_dereference(dev_maps->attr_map[tci]);
1522                 if (!map)
1523                         continue;
1524
1525                 for (i = map->len; i--;) {
1526                         if (map->queues[i] == index) {
1527                                 set_bit(j, mask);
1528                                 break;
1529                         }
1530                 }
1531         }
1532 out_no_maps:
1533         rcu_read_unlock();
1534
1535         rtnl_unlock();
1536
1537         len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1538         bitmap_free(mask);
1539
1540         return len < PAGE_SIZE ? len : -EINVAL;
1541
1542 err_rtnl_unlock:
1543         rtnl_unlock();
1544         return ret;
1545 }
1546
1547 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1548                               size_t len)
1549 {
1550         struct net_device *dev = queue->dev;
1551         struct net *net = dev_net(dev);
1552         unsigned long *mask, index;
1553         int err;
1554
1555         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1556                 return -EPERM;
1557
1558         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1559         if (!mask)
1560                 return -ENOMEM;
1561
1562         index = get_netdev_queue_index(queue);
1563
1564         err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1565         if (err) {
1566                 bitmap_free(mask);
1567                 return err;
1568         }
1569
1570         if (!rtnl_trylock()) {
1571                 bitmap_free(mask);
1572                 return restart_syscall();
1573         }
1574
1575         cpus_read_lock();
1576         err = __netif_set_xps_queue(dev, mask, index, true);
1577         cpus_read_unlock();
1578
1579         rtnl_unlock();
1580
1581         bitmap_free(mask);
1582         return err ? : len;
1583 }
1584
1585 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1586         = __ATTR_RW(xps_rxqs);
1587 #endif /* CONFIG_XPS */
1588
1589 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1590         &queue_trans_timeout.attr,
1591         &queue_traffic_class.attr,
1592 #ifdef CONFIG_XPS
1593         &xps_cpus_attribute.attr,
1594         &xps_rxqs_attribute.attr,
1595         &queue_tx_maxrate.attr,
1596 #endif
1597         NULL
1598 };
1599 ATTRIBUTE_GROUPS(netdev_queue_default);
1600
1601 static void netdev_queue_release(struct kobject *kobj)
1602 {
1603         struct netdev_queue *queue = to_netdev_queue(kobj);
1604
1605         memset(kobj, 0, sizeof(*kobj));
1606         dev_put(queue->dev);
1607 }
1608
1609 static const void *netdev_queue_namespace(struct kobject *kobj)
1610 {
1611         struct netdev_queue *queue = to_netdev_queue(kobj);
1612         struct device *dev = &queue->dev->dev;
1613         const void *ns = NULL;
1614
1615         if (dev->class && dev->class->ns_type)
1616                 ns = dev->class->namespace(dev);
1617
1618         return ns;
1619 }
1620
1621 static void netdev_queue_get_ownership(struct kobject *kobj,
1622                                        kuid_t *uid, kgid_t *gid)
1623 {
1624         const struct net *net = netdev_queue_namespace(kobj);
1625
1626         net_ns_get_ownership(net, uid, gid);
1627 }
1628
1629 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1630         .sysfs_ops = &netdev_queue_sysfs_ops,
1631         .release = netdev_queue_release,
1632         .default_groups = netdev_queue_default_groups,
1633         .namespace = netdev_queue_namespace,
1634         .get_ownership = netdev_queue_get_ownership,
1635 };
1636
1637 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1638 {
1639         struct netdev_queue *queue = dev->_tx + index;
1640         struct kobject *kobj = &queue->kobj;
1641         int error = 0;
1642
1643         /* Kobject_put later will trigger netdev_queue_release call
1644          * which decreases dev refcount: Take that reference here
1645          */
1646         dev_hold(queue->dev);
1647
1648         kobj->kset = dev->queues_kset;
1649         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1650                                      "tx-%u", index);
1651         if (error)
1652                 goto err;
1653
1654 #ifdef CONFIG_BQL
1655         error = sysfs_create_group(kobj, &dql_group);
1656         if (error)
1657                 goto err;
1658 #endif
1659
1660         kobject_uevent(kobj, KOBJ_ADD);
1661         return 0;
1662
1663 err:
1664         kobject_put(kobj);
1665         return error;
1666 }
1667
1668 static int tx_queue_change_owner(struct net_device *ndev, int index,
1669                                  kuid_t kuid, kgid_t kgid)
1670 {
1671         struct netdev_queue *queue = ndev->_tx + index;
1672         struct kobject *kobj = &queue->kobj;
1673         int error;
1674
1675         error = sysfs_change_owner(kobj, kuid, kgid);
1676         if (error)
1677                 return error;
1678
1679 #ifdef CONFIG_BQL
1680         error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
1681 #endif
1682         return error;
1683 }
1684 #endif /* CONFIG_SYSFS */
1685
1686 int
1687 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1688 {
1689 #ifdef CONFIG_SYSFS
1690         int i;
1691         int error = 0;
1692
1693         for (i = old_num; i < new_num; i++) {
1694                 error = netdev_queue_add_kobject(dev, i);
1695                 if (error) {
1696                         new_num = old_num;
1697                         break;
1698                 }
1699         }
1700
1701         while (--i >= new_num) {
1702                 struct netdev_queue *queue = dev->_tx + i;
1703
1704                 if (!refcount_read(&dev_net(dev)->count))
1705                         queue->kobj.uevent_suppress = 1;
1706 #ifdef CONFIG_BQL
1707                 sysfs_remove_group(&queue->kobj, &dql_group);
1708 #endif
1709                 kobject_put(&queue->kobj);
1710         }
1711
1712         return error;
1713 #else
1714         return 0;
1715 #endif /* CONFIG_SYSFS */
1716 }
1717
1718 static int net_tx_queue_change_owner(struct net_device *dev, int num,
1719                                      kuid_t kuid, kgid_t kgid)
1720 {
1721 #ifdef CONFIG_SYSFS
1722         int error = 0;
1723         int i;
1724
1725         for (i = 0; i < num; i++) {
1726                 error = tx_queue_change_owner(dev, i, kuid, kgid);
1727                 if (error)
1728                         break;
1729         }
1730
1731         return error;
1732 #else
1733         return 0;
1734 #endif /* CONFIG_SYSFS */
1735 }
1736
1737 static int register_queue_kobjects(struct net_device *dev)
1738 {
1739         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1740
1741 #ifdef CONFIG_SYSFS
1742         dev->queues_kset = kset_create_and_add("queues",
1743                                                NULL, &dev->dev.kobj);
1744         if (!dev->queues_kset)
1745                 return -ENOMEM;
1746         real_rx = dev->real_num_rx_queues;
1747 #endif
1748         real_tx = dev->real_num_tx_queues;
1749
1750         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1751         if (error)
1752                 goto error;
1753         rxq = real_rx;
1754
1755         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1756         if (error)
1757                 goto error;
1758         txq = real_tx;
1759
1760         return 0;
1761
1762 error:
1763         netdev_queue_update_kobjects(dev, txq, 0);
1764         net_rx_queue_update_kobjects(dev, rxq, 0);
1765 #ifdef CONFIG_SYSFS
1766         kset_unregister(dev->queues_kset);
1767 #endif
1768         return error;
1769 }
1770
1771 static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
1772 {
1773         int error = 0, real_rx = 0, real_tx = 0;
1774
1775 #ifdef CONFIG_SYSFS
1776         if (ndev->queues_kset) {
1777                 error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
1778                 if (error)
1779                         return error;
1780         }
1781         real_rx = ndev->real_num_rx_queues;
1782 #endif
1783         real_tx = ndev->real_num_tx_queues;
1784
1785         error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
1786         if (error)
1787                 return error;
1788
1789         error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
1790         if (error)
1791                 return error;
1792
1793         return 0;
1794 }
1795
1796 static void remove_queue_kobjects(struct net_device *dev)
1797 {
1798         int real_rx = 0, real_tx = 0;
1799
1800 #ifdef CONFIG_SYSFS
1801         real_rx = dev->real_num_rx_queues;
1802 #endif
1803         real_tx = dev->real_num_tx_queues;
1804
1805         net_rx_queue_update_kobjects(dev, real_rx, 0);
1806         netdev_queue_update_kobjects(dev, real_tx, 0);
1807
1808         dev->real_num_rx_queues = 0;
1809         dev->real_num_tx_queues = 0;
1810 #ifdef CONFIG_SYSFS
1811         kset_unregister(dev->queues_kset);
1812 #endif
1813 }
1814
1815 static bool net_current_may_mount(void)
1816 {
1817         struct net *net = current->nsproxy->net_ns;
1818
1819         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1820 }
1821
1822 static void *net_grab_current_ns(void)
1823 {
1824         struct net *ns = current->nsproxy->net_ns;
1825 #ifdef CONFIG_NET_NS
1826         if (ns)
1827                 refcount_inc(&ns->passive);
1828 #endif
1829         return ns;
1830 }
1831
1832 static const void *net_initial_ns(void)
1833 {
1834         return &init_net;
1835 }
1836
1837 static const void *net_netlink_ns(struct sock *sk)
1838 {
1839         return sock_net(sk);
1840 }
1841
1842 const struct kobj_ns_type_operations net_ns_type_operations = {
1843         .type = KOBJ_NS_TYPE_NET,
1844         .current_may_mount = net_current_may_mount,
1845         .grab_current_ns = net_grab_current_ns,
1846         .netlink_ns = net_netlink_ns,
1847         .initial_ns = net_initial_ns,
1848         .drop_ns = net_drop_ns,
1849 };
1850 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1851
1852 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1853 {
1854         struct net_device *dev = to_net_dev(d);
1855         int retval;
1856
1857         /* pass interface to uevent. */
1858         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1859         if (retval)
1860                 goto exit;
1861
1862         /* pass ifindex to uevent.
1863          * ifindex is useful as it won't change (interface name may change)
1864          * and is what RtNetlink uses natively.
1865          */
1866         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1867
1868 exit:
1869         return retval;
1870 }
1871
1872 /*
1873  *      netdev_release -- destroy and free a dead device.
1874  *      Called when last reference to device kobject is gone.
1875  */
1876 static void netdev_release(struct device *d)
1877 {
1878         struct net_device *dev = to_net_dev(d);
1879
1880         BUG_ON(dev->reg_state != NETREG_RELEASED);
1881
1882         /* no need to wait for rcu grace period:
1883          * device is dead and about to be freed.
1884          */
1885         kfree(rcu_access_pointer(dev->ifalias));
1886         netdev_freemem(dev);
1887 }
1888
1889 static const void *net_namespace(struct device *d)
1890 {
1891         struct net_device *dev = to_net_dev(d);
1892
1893         return dev_net(dev);
1894 }
1895
1896 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1897 {
1898         struct net_device *dev = to_net_dev(d);
1899         const struct net *net = dev_net(dev);
1900
1901         net_ns_get_ownership(net, uid, gid);
1902 }
1903
1904 static struct class net_class __ro_after_init = {
1905         .name = "net",
1906         .dev_release = netdev_release,
1907         .dev_groups = net_class_groups,
1908         .dev_uevent = netdev_uevent,
1909         .ns_type = &net_ns_type_operations,
1910         .namespace = net_namespace,
1911         .get_ownership = net_get_ownership,
1912 };
1913
1914 #ifdef CONFIG_OF_NET
1915 static int of_dev_node_match(struct device *dev, const void *data)
1916 {
1917         for (; dev; dev = dev->parent) {
1918                 if (dev->of_node == data)
1919                         return 1;
1920         }
1921
1922         return 0;
1923 }
1924
1925 /*
1926  * of_find_net_device_by_node - lookup the net device for the device node
1927  * @np: OF device node
1928  *
1929  * Looks up the net_device structure corresponding with the device node.
1930  * If successful, returns a pointer to the net_device with the embedded
1931  * struct device refcount incremented by one, or NULL on failure. The
1932  * refcount must be dropped when done with the net_device.
1933  */
1934 struct net_device *of_find_net_device_by_node(struct device_node *np)
1935 {
1936         struct device *dev;
1937
1938         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1939         if (!dev)
1940                 return NULL;
1941
1942         return to_net_dev(dev);
1943 }
1944 EXPORT_SYMBOL(of_find_net_device_by_node);
1945 #endif
1946
1947 /* Delete sysfs entries but hold kobject reference until after all
1948  * netdev references are gone.
1949  */
1950 void netdev_unregister_kobject(struct net_device *ndev)
1951 {
1952         struct device *dev = &ndev->dev;
1953
1954         if (!refcount_read(&dev_net(ndev)->count))
1955                 dev_set_uevent_suppress(dev, 1);
1956
1957         kobject_get(&dev->kobj);
1958
1959         remove_queue_kobjects(ndev);
1960
1961         pm_runtime_set_memalloc_noio(dev, false);
1962
1963         device_del(dev);
1964 }
1965
1966 /* Create sysfs entries for network device. */
1967 int netdev_register_kobject(struct net_device *ndev)
1968 {
1969         struct device *dev = &ndev->dev;
1970         const struct attribute_group **groups = ndev->sysfs_groups;
1971         int error = 0;
1972
1973         device_initialize(dev);
1974         dev->class = &net_class;
1975         dev->platform_data = ndev;
1976         dev->groups = groups;
1977
1978         dev_set_name(dev, "%s", ndev->name);
1979
1980 #ifdef CONFIG_SYSFS
1981         /* Allow for a device specific group */
1982         if (*groups)
1983                 groups++;
1984
1985         *groups++ = &netstat_group;
1986
1987 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1988         if (ndev->ieee80211_ptr)
1989                 *groups++ = &wireless_group;
1990 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1991         else if (ndev->wireless_handlers)
1992                 *groups++ = &wireless_group;
1993 #endif
1994 #endif
1995 #endif /* CONFIG_SYSFS */
1996
1997         error = device_add(dev);
1998         if (error)
1999                 return error;
2000
2001         error = register_queue_kobjects(ndev);
2002         if (error) {
2003                 device_del(dev);
2004                 return error;
2005         }
2006
2007         pm_runtime_set_memalloc_noio(dev, true);
2008
2009         return error;
2010 }
2011
2012 /* Change owner for sysfs entries when moving network devices across network
2013  * namespaces owned by different user namespaces.
2014  */
2015 int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
2016                         const struct net *net_new)
2017 {
2018         kuid_t old_uid = GLOBAL_ROOT_UID, new_uid = GLOBAL_ROOT_UID;
2019         kgid_t old_gid = GLOBAL_ROOT_GID, new_gid = GLOBAL_ROOT_GID;
2020         struct device *dev = &ndev->dev;
2021         int error;
2022
2023         net_ns_get_ownership(net_old, &old_uid, &old_gid);
2024         net_ns_get_ownership(net_new, &new_uid, &new_gid);
2025
2026         /* The network namespace was changed but the owning user namespace is
2027          * identical so there's no need to change the owner of sysfs entries.
2028          */
2029         if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
2030                 return 0;
2031
2032         error = device_change_owner(dev, new_uid, new_gid);
2033         if (error)
2034                 return error;
2035
2036         error = queue_change_owner(ndev, new_uid, new_gid);
2037         if (error)
2038                 return error;
2039
2040         return 0;
2041 }
2042
2043 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
2044                                 const void *ns)
2045 {
2046         return class_create_file_ns(&net_class, class_attr, ns);
2047 }
2048 EXPORT_SYMBOL(netdev_class_create_file_ns);
2049
2050 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
2051                                  const void *ns)
2052 {
2053         class_remove_file_ns(&net_class, class_attr, ns);
2054 }
2055 EXPORT_SYMBOL(netdev_class_remove_file_ns);
2056
2057 int __init netdev_kobject_init(void)
2058 {
2059         kobj_ns_type_register(&net_ns_type_operations);
2060         return class_register(&net_class);
2061 }