net/core/net-sysfs.c

   1 /*
   2  * net-sysfs.c - network device class and attributes
   3  *
   4  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/capability.h>
  13 #include <linux/kernel.h>
  14 #include <linux/netdevice.h>
  15 #include <net/switchdev.h>
  16 #include <linux/if_arp.h>
  17 #include <linux/slab.h>
  18 #include <linux/nsproxy.h>
  19 #include <net/sock.h>
  20 #include <net/net_namespace.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/vmalloc.h>
  23 #include <linux/export.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/pm_runtime.h>
  26 #include <linux/of.h>
  27 #include <linux/of_net.h>
  28
  29 #include "net-sysfs.h"
  30
  31 #ifdef CONFIG_SYSFS
  32 static const char fmt_hex[] = "%#x\n";
  33 static const char fmt_dec[] = "%d\n";
  34 static const char fmt_ulong[] = "%lu\n";
  35 static const char fmt_u64[] = "%llu\n";
  36
  37 static inline int dev_isalive(const struct net_device *dev)
  38 {
  39         return dev->reg_state <= NETREG_REGISTERED;
  40 }
  41
  42 /* use same locking rules as GIF* ioctl's */
  43 static ssize_t netdev_show(const struct device *dev,
  44                            struct device_attribute *attr, char *buf,
  45                            ssize_t (*format)(const struct net_device *, char *))
  46 {
  47         struct net_device *ndev = to_net_dev(dev);
  48         ssize_t ret = -EINVAL;
  49
  50         read_lock(&dev_base_lock);
  51         if (dev_isalive(ndev))
  52                 ret = (*format)(ndev, buf);
  53         read_unlock(&dev_base_lock);
  54
  55         return ret;
  56 }
  57
  58 /* generate a show function for simple field */
  59 #define NETDEVICE_SHOW(field, format_string)                            \
  60 static ssize_t format_##field(const struct net_device *dev, char *buf)  \
  61 {                                                                       \
  62         return sprintf(buf, format_string, dev->field);                 \
  63 }                                                                       \
  64 static ssize_t field##_show(struct device *dev,                         \
  65                             struct device_attribute *attr, char *buf)   \
  66 {                                                                       \
  67         return netdev_show(dev, attr, buf, format_##field);             \
  68 }                                                                       \
  69
  70 #define NETDEVICE_SHOW_RO(field, format_string)                         \
  71 NETDEVICE_SHOW(field, format_string);                                   \
  72 static DEVICE_ATTR_RO(field)
  73
  74 #define NETDEVICE_SHOW_RW(field, format_string)                         \
  75 NETDEVICE_SHOW(field, format_string);                                   \
  76 static DEVICE_ATTR_RW(field)
  77
  78 /* use same locking and permission rules as SIF* ioctl's */
  79 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  80                             const char *buf, size_t len,
  81                             int (*set)(struct net_device *, unsigned long))
  82 {
  83         struct net_device *netdev = to_net_dev(dev);
  84         struct net *net = dev_net(netdev);
  85         unsigned long new;
  86         int ret = -EINVAL;
  87
  88         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  89                 return -EPERM;
  90
  91         ret = kstrtoul(buf, 0, &new);
  92         if (ret)
  93                 goto err;
  94
  95         if (!rtnl_trylock())
  96                 return restart_syscall();
  97
  98         if (dev_isalive(netdev)) {
  99                 if ((ret = (*set)(netdev, new)) == 0)
 100                         ret = len;
 101         }
 102         rtnl_unlock();
 103  err:
 104         return ret;
 105 }
 106
 107 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 108 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 109 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 110 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 111 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 112 NETDEVICE_SHOW_RO(type, fmt_dec);
 113 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 114
 115 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
 116                            char *buf)
 117 {
 118         struct net_device *ndev = to_net_dev(dev);
 119
 120         return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
 121 }
 122 static DEVICE_ATTR_RO(iflink);
 123
 124 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 125 {
 126         return sprintf(buf, fmt_dec, dev->name_assign_type);
 127 }
 128
 129 static ssize_t name_assign_type_show(struct device *dev,
 130                                      struct device_attribute *attr,
 131                                      char *buf)
 132 {
 133         struct net_device *ndev = to_net_dev(dev);
 134         ssize_t ret = -EINVAL;
 135
 136         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
 137                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
 138
 139         return ret;
 140 }
 141 static DEVICE_ATTR_RO(name_assign_type);
 142
 143 /* use same locking rules as GIFHWADDR ioctl's */
 144 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 145                             char *buf)
 146 {
 147         struct net_device *ndev = to_net_dev(dev);
 148         ssize_t ret = -EINVAL;
 149
 150         read_lock(&dev_base_lock);
 151         if (dev_isalive(ndev))
 152                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 153         read_unlock(&dev_base_lock);
 154         return ret;
 155 }
 156 static DEVICE_ATTR_RO(address);
 157
 158 static ssize_t broadcast_show(struct device *dev,
 159                               struct device_attribute *attr, char *buf)
 160 {
 161         struct net_device *ndev = to_net_dev(dev);
 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         return netdev_store(dev, attr, buf, len, change_carrier);
 179 }
 180
 181 static ssize_t carrier_show(struct device *dev,
 182                             struct device_attribute *attr, char *buf)
 183 {
 184         struct net_device *netdev = to_net_dev(dev);
 185         if (netif_running(netdev)) {
 186                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 187         }
 188         return -EINVAL;
 189 }
 190 static DEVICE_ATTR_RW(carrier);
 191
 192 static ssize_t speed_show(struct device *dev,
 193                           struct device_attribute *attr, char *buf)
 194 {
 195         struct net_device *netdev = to_net_dev(dev);
 196         int ret = -EINVAL;
 197
 198         if (!rtnl_trylock())
 199                 return restart_syscall();
 200
 201         if (netif_running(netdev)) {
 202                 struct ethtool_link_ksettings cmd;
 203
 204                 if (!__ethtool_get_link_ksettings(netdev, &cmd))
 205                         ret = sprintf(buf, fmt_dec, cmd.base.speed);
 206         }
 207         rtnl_unlock();
 208         return ret;
 209 }
 210 static DEVICE_ATTR_RO(speed);
 211
 212 static ssize_t duplex_show(struct device *dev,
 213                            struct device_attribute *attr, char *buf)
 214 {
 215         struct net_device *netdev = to_net_dev(dev);
 216         int ret = -EINVAL;
 217
 218         if (!rtnl_trylock())
 219                 return restart_syscall();
 220
 221         if (netif_running(netdev)) {
 222                 struct ethtool_link_ksettings cmd;
 223
 224                 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
 225                         const char *duplex;
 226
 227                         switch (cmd.base.duplex) {
 228                         case DUPLEX_HALF:
 229                                 duplex = "half";
 230                                 break;
 231                         case DUPLEX_FULL:
 232                                 duplex = "full";
 233                                 break;
 234                         default:
 235                                 duplex = "unknown";
 236                                 break;
 237                         }
 238                         ret = sprintf(buf, "%s\n", duplex);
 239                 }
 240         }
 241         rtnl_unlock();
 242         return ret;
 243 }
 244 static DEVICE_ATTR_RO(duplex);
 245
 246 static ssize_t dormant_show(struct device *dev,
 247                             struct device_attribute *attr, char *buf)
 248 {
 249         struct net_device *netdev = to_net_dev(dev);
 250
 251         if (netif_running(netdev))
 252                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 253
 254         return -EINVAL;
 255 }
 256 static DEVICE_ATTR_RO(dormant);
 257
 258 static const char *const operstates[] = {
 259         "unknown",
 260         "notpresent", /* currently unused */
 261         "down",
 262         "lowerlayerdown",
 263         "testing", /* currently unused */
 264         "dormant",
 265         "up"
 266 };
 267
 268 static ssize_t operstate_show(struct device *dev,
 269                               struct device_attribute *attr, char *buf)
 270 {
 271         const struct net_device *netdev = to_net_dev(dev);
 272         unsigned char operstate;
 273
 274         read_lock(&dev_base_lock);
 275         operstate = netdev->operstate;
 276         if (!netif_running(netdev))
 277                 operstate = IF_OPER_DOWN;
 278         read_unlock(&dev_base_lock);
 279
 280         if (operstate >= ARRAY_SIZE(operstates))
 281                 return -EINVAL; /* should not happen */
 282
 283         return sprintf(buf, "%s\n", operstates[operstate]);
 284 }
 285 static DEVICE_ATTR_RO(operstate);
 286
 287 static ssize_t carrier_changes_show(struct device *dev,
 288                                     struct device_attribute *attr,
 289                                     char *buf)
 290 {
 291         struct net_device *netdev = to_net_dev(dev);
 292         return sprintf(buf, fmt_dec,
 293                        atomic_read(&netdev->carrier_changes));
 294 }
 295 static DEVICE_ATTR_RO(carrier_changes);
 296
 297 /* read-write attributes */
 298
 299 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 300 {
 301         return dev_set_mtu(dev, (int) new_mtu);
 302 }
 303
 304 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 305                          const char *buf, size_t len)
 306 {
 307         return netdev_store(dev, attr, buf, len, change_mtu);
 308 }
 309 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 310
 311 static int change_flags(struct net_device *dev, unsigned long new_flags)
 312 {
 313         return dev_change_flags(dev, (unsigned int) new_flags);
 314 }
 315
 316 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 317                            const char *buf, size_t len)
 318 {
 319         return netdev_store(dev, attr, buf, len, change_flags);
 320 }
 321 NETDEVICE_SHOW_RW(flags, fmt_hex);
 322
 323 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
 324 {
 325         dev->tx_queue_len = new_len;
 326         return 0;
 327 }
 328
 329 static ssize_t tx_queue_len_store(struct device *dev,
 330                                   struct device_attribute *attr,
 331                                   const char *buf, size_t len)
 332 {
 333         if (!capable(CAP_NET_ADMIN))
 334                 return -EPERM;
 335
 336         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
 337 }
 338 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
 339
 340 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 341 {
 342         dev->gro_flush_timeout = val;
 343         return 0;
 344 }
 345
 346 static ssize_t gro_flush_timeout_store(struct device *dev,
 347                                   struct device_attribute *attr,
 348                                   const char *buf, size_t len)
 349 {
 350         if (!capable(CAP_NET_ADMIN))
 351                 return -EPERM;
 352
 353         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 354 }
 355 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 356
 357 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 358                              const char *buf, size_t len)
 359 {
 360         struct net_device *netdev = to_net_dev(dev);
 361         struct net *net = dev_net(netdev);
 362         size_t count = len;
 363         ssize_t ret;
 364
 365         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 366                 return -EPERM;
 367
 368         /* ignore trailing newline */
 369         if (len >  0 && buf[len - 1] == '\n')
 370                 --count;
 371
 372         if (!rtnl_trylock())
 373                 return restart_syscall();
 374         ret = dev_set_alias(netdev, buf, count);
 375         rtnl_unlock();
 376
 377         return ret < 0 ? ret : len;
 378 }
 379
 380 static ssize_t ifalias_show(struct device *dev,
 381                             struct device_attribute *attr, char *buf)
 382 {
 383         const struct net_device *netdev = to_net_dev(dev);
 384         ssize_t ret = 0;
 385
 386         if (!rtnl_trylock())
 387                 return restart_syscall();
 388         if (netdev->ifalias)
 389                 ret = sprintf(buf, "%s\n", netdev->ifalias);
 390         rtnl_unlock();
 391         return ret;
 392 }
 393 static DEVICE_ATTR_RW(ifalias);
 394
 395 static int change_group(struct net_device *dev, unsigned long new_group)
 396 {
 397         dev_set_group(dev, (int) new_group);
 398         return 0;
 399 }
 400
 401 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 402                            const char *buf, size_t len)
 403 {
 404         return netdev_store(dev, attr, buf, len, change_group);
 405 }
 406 NETDEVICE_SHOW(group, fmt_dec);
 407 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
 408
 409 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 410 {
 411         return dev_change_proto_down(dev, (bool) proto_down);
 412 }
 413
 414 static ssize_t proto_down_store(struct device *dev,
 415                                 struct device_attribute *attr,
 416                                 const char *buf, size_t len)
 417 {
 418         return netdev_store(dev, attr, buf, len, change_proto_down);
 419 }
 420 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 421
 422 static ssize_t phys_port_id_show(struct device *dev,
 423                                  struct device_attribute *attr, char *buf)
 424 {
 425         struct net_device *netdev = to_net_dev(dev);
 426         ssize_t ret = -EINVAL;
 427
 428         if (!rtnl_trylock())
 429                 return restart_syscall();
 430
 431         if (dev_isalive(netdev)) {
 432                 struct netdev_phys_item_id ppid;
 433
 434                 ret = dev_get_phys_port_id(netdev, &ppid);
 435                 if (!ret)
 436                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 437         }
 438         rtnl_unlock();
 439
 440         return ret;
 441 }
 442 static DEVICE_ATTR_RO(phys_port_id);
 443
 444 static ssize_t phys_port_name_show(struct device *dev,
 445                                    struct device_attribute *attr, char *buf)
 446 {
 447         struct net_device *netdev = to_net_dev(dev);
 448         ssize_t ret = -EINVAL;
 449
 450         if (!rtnl_trylock())
 451                 return restart_syscall();
 452
 453         if (dev_isalive(netdev)) {
 454                 char name[IFNAMSIZ];
 455
 456                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 457                 if (!ret)
 458                         ret = sprintf(buf, "%s\n", name);
 459         }
 460         rtnl_unlock();
 461
 462         return ret;
 463 }
 464 static DEVICE_ATTR_RO(phys_port_name);
 465
 466 static ssize_t phys_switch_id_show(struct device *dev,
 467                                    struct device_attribute *attr, char *buf)
 468 {
 469         struct net_device *netdev = to_net_dev(dev);
 470         ssize_t ret = -EINVAL;
 471
 472         if (!rtnl_trylock())
 473                 return restart_syscall();
 474
 475         if (dev_isalive(netdev)) {
 476                 struct switchdev_attr attr = {
 477                         .orig_dev = netdev,
 478                         .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
 479                         .flags = SWITCHDEV_F_NO_RECURSE,
 480                 };
 481
 482                 ret = switchdev_port_attr_get(netdev, &attr);
 483                 if (!ret)
 484                         ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
 485                                       attr.u.ppid.id);
 486         }
 487         rtnl_unlock();
 488
 489         return ret;
 490 }
 491 static DEVICE_ATTR_RO(phys_switch_id);
 492
 493 static struct attribute *net_class_attrs[] = {
 494         &dev_attr_netdev_group.attr,
 495         &dev_attr_type.attr,
 496         &dev_attr_dev_id.attr,
 497         &dev_attr_dev_port.attr,
 498         &dev_attr_iflink.attr,
 499         &dev_attr_ifindex.attr,
 500         &dev_attr_name_assign_type.attr,
 501         &dev_attr_addr_assign_type.attr,
 502         &dev_attr_addr_len.attr,
 503         &dev_attr_link_mode.attr,
 504         &dev_attr_address.attr,
 505         &dev_attr_broadcast.attr,
 506         &dev_attr_speed.attr,
 507         &dev_attr_duplex.attr,
 508         &dev_attr_dormant.attr,
 509         &dev_attr_operstate.attr,
 510         &dev_attr_carrier_changes.attr,
 511         &dev_attr_ifalias.attr,
 512         &dev_attr_carrier.attr,
 513         &dev_attr_mtu.attr,
 514         &dev_attr_flags.attr,
 515         &dev_attr_tx_queue_len.attr,
 516         &dev_attr_gro_flush_timeout.attr,
 517         &dev_attr_phys_port_id.attr,
 518         &dev_attr_phys_port_name.attr,
 519         &dev_attr_phys_switch_id.attr,
 520         &dev_attr_proto_down.attr,
 521         NULL,
 522 };
 523 ATTRIBUTE_GROUPS(net_class);
 524
 525 /* Show a given an attribute in the statistics group */
 526 static ssize_t netstat_show(const struct device *d,
 527                             struct device_attribute *attr, char *buf,
 528                             unsigned long offset)
 529 {
 530         struct net_device *dev = to_net_dev(d);
 531         ssize_t ret = -EINVAL;
 532
 533         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 534                         offset % sizeof(u64) != 0);
 535
 536         read_lock(&dev_base_lock);
 537         if (dev_isalive(dev)) {
 538                 struct rtnl_link_stats64 temp;
 539                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 540
 541                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
 542         }
 543         read_unlock(&dev_base_lock);
 544         return ret;
 545 }
 546
 547 /* generate a read-only statistics attribute */
 548 #define NETSTAT_ENTRY(name)                                             \
 549 static ssize_t name##_show(struct device *d,                            \
 550                            struct device_attribute *attr, char *buf)    \
 551 {                                                                       \
 552         return netstat_show(d, attr, buf,                               \
 553                             offsetof(struct rtnl_link_stats64, name));  \
 554 }                                                                       \
 555 static DEVICE_ATTR_RO(name)
 556
 557 NETSTAT_ENTRY(rx_packets);
 558 NETSTAT_ENTRY(tx_packets);
 559 NETSTAT_ENTRY(rx_bytes);
 560 NETSTAT_ENTRY(tx_bytes);
 561 NETSTAT_ENTRY(rx_errors);
 562 NETSTAT_ENTRY(tx_errors);
 563 NETSTAT_ENTRY(rx_dropped);
 564 NETSTAT_ENTRY(tx_dropped);
 565 NETSTAT_ENTRY(multicast);
 566 NETSTAT_ENTRY(collisions);
 567 NETSTAT_ENTRY(rx_length_errors);
 568 NETSTAT_ENTRY(rx_over_errors);
 569 NETSTAT_ENTRY(rx_crc_errors);
 570 NETSTAT_ENTRY(rx_frame_errors);
 571 NETSTAT_ENTRY(rx_fifo_errors);
 572 NETSTAT_ENTRY(rx_missed_errors);
 573 NETSTAT_ENTRY(tx_aborted_errors);
 574 NETSTAT_ENTRY(tx_carrier_errors);
 575 NETSTAT_ENTRY(tx_fifo_errors);
 576 NETSTAT_ENTRY(tx_heartbeat_errors);
 577 NETSTAT_ENTRY(tx_window_errors);
 578 NETSTAT_ENTRY(rx_compressed);
 579 NETSTAT_ENTRY(tx_compressed);
 580 NETSTAT_ENTRY(rx_nohandler);
 581
 582 static struct attribute *netstat_attrs[] = {
 583         &dev_attr_rx_packets.attr,
 584         &dev_attr_tx_packets.attr,
 585         &dev_attr_rx_bytes.attr,
 586         &dev_attr_tx_bytes.attr,
 587         &dev_attr_rx_errors.attr,
 588         &dev_attr_tx_errors.attr,
 589         &dev_attr_rx_dropped.attr,
 590         &dev_attr_tx_dropped.attr,
 591         &dev_attr_multicast.attr,
 592         &dev_attr_collisions.attr,
 593         &dev_attr_rx_length_errors.attr,
 594         &dev_attr_rx_over_errors.attr,
 595         &dev_attr_rx_crc_errors.attr,
 596         &dev_attr_rx_frame_errors.attr,
 597         &dev_attr_rx_fifo_errors.attr,
 598         &dev_attr_rx_missed_errors.attr,
 599         &dev_attr_tx_aborted_errors.attr,
 600         &dev_attr_tx_carrier_errors.attr,
 601         &dev_attr_tx_fifo_errors.attr,
 602         &dev_attr_tx_heartbeat_errors.attr,
 603         &dev_attr_tx_window_errors.attr,
 604         &dev_attr_rx_compressed.attr,
 605         &dev_attr_tx_compressed.attr,
 606         &dev_attr_rx_nohandler.attr,
 607         NULL
 608 };
 609
 610
 611 static struct attribute_group netstat_group = {
 612         .name  = "statistics",
 613         .attrs  = netstat_attrs,
 614 };
 615
 616 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 617 static struct attribute *wireless_attrs[] = {
 618         NULL
 619 };
 620
 621 static struct attribute_group wireless_group = {
 622         .name = "wireless",
 623         .attrs = wireless_attrs,
 624 };
 625 #endif
 626
 627 #else /* CONFIG_SYSFS */
 628 #define net_class_groups        NULL
 629 #endif /* CONFIG_SYSFS */
 630
 631 #ifdef CONFIG_SYSFS
 632 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 633     struct rx_queue_attribute, attr)
 634
 635 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 636
 637 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 638                                   char *buf)
 639 {
 640         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 641         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 642
 643         if (!attribute->show)
 644                 return -EIO;
 645
 646         return attribute->show(queue, attribute, buf);
 647 }
 648
 649 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 650                                    const char *buf, size_t count)
 651 {
 652         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 653         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 654
 655         if (!attribute->store)
 656                 return -EIO;
 657
 658         return attribute->store(queue, attribute, buf, count);
 659 }
 660
 661 static const struct sysfs_ops rx_queue_sysfs_ops = {
 662         .show = rx_queue_attr_show,
 663         .store = rx_queue_attr_store,
 664 };
 665
 666 #ifdef CONFIG_RPS
 667 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 668                             struct rx_queue_attribute *attribute, char *buf)
 669 {
 670         struct rps_map *map;
 671         cpumask_var_t mask;
 672         int i, len;
 673
 674         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 675                 return -ENOMEM;
 676
 677         rcu_read_lock();
 678         map = rcu_dereference(queue->rps_map);
 679         if (map)
 680                 for (i = 0; i < map->len; i++)
 681                         cpumask_set_cpu(map->cpus[i], mask);
 682
 683         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 684         rcu_read_unlock();
 685         free_cpumask_var(mask);
 686
 687         return len < PAGE_SIZE ? len : -EINVAL;
 688 }
 689
 690 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 691                       struct rx_queue_attribute *attribute,
 692                       const char *buf, size_t len)
 693 {
 694         struct rps_map *old_map, *map;
 695         cpumask_var_t mask;
 696         int err, cpu, i;
 697         static DEFINE_MUTEX(rps_map_mutex);
 698
 699         if (!capable(CAP_NET_ADMIN))
 700                 return -EPERM;
 701
 702         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 703                 return -ENOMEM;
 704
 705         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 706         if (err) {
 707                 free_cpumask_var(mask);
 708                 return err;
 709         }
 710
 711         map = kzalloc(max_t(unsigned int,
 712             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 713             GFP_KERNEL);
 714         if (!map) {
 715                 free_cpumask_var(mask);
 716                 return -ENOMEM;
 717         }
 718
 719         i = 0;
 720         for_each_cpu_and(cpu, mask, cpu_online_mask)
 721                 map->cpus[i++] = cpu;
 722
 723         if (i)
 724                 map->len = i;
 725         else {
 726                 kfree(map);
 727                 map = NULL;
 728         }
 729
 730         mutex_lock(&rps_map_mutex);
 731         old_map = rcu_dereference_protected(queue->rps_map,
 732                                             mutex_is_locked(&rps_map_mutex));
 733         rcu_assign_pointer(queue->rps_map, map);
 734
 735         if (map)
 736                 static_key_slow_inc(&rps_needed);
 737         if (old_map)
 738                 static_key_slow_dec(&rps_needed);
 739
 740         mutex_unlock(&rps_map_mutex);
 741
 742         if (old_map)
 743                 kfree_rcu(old_map, rcu);
 744
 745         free_cpumask_var(mask);
 746         return len;
 747 }
 748
 749 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 750                                            struct rx_queue_attribute *attr,
 751                                            char *buf)
 752 {
 753         struct rps_dev_flow_table *flow_table;
 754         unsigned long val = 0;
 755
 756         rcu_read_lock();
 757         flow_table = rcu_dereference(queue->rps_flow_table);
 758         if (flow_table)
 759                 val = (unsigned long)flow_table->mask + 1;
 760         rcu_read_unlock();
 761
 762         return sprintf(buf, "%lu\n", val);
 763 }
 764
 765 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 766 {
 767         struct rps_dev_flow_table *table = container_of(rcu,
 768             struct rps_dev_flow_table, rcu);
 769         vfree(table);
 770 }
 771
 772 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 773                                      struct rx_queue_attribute *attr,
 774                                      const char *buf, size_t len)
 775 {
 776         unsigned long mask, count;
 777         struct rps_dev_flow_table *table, *old_table;
 778         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 779         int rc;
 780
 781         if (!capable(CAP_NET_ADMIN))
 782                 return -EPERM;
 783
 784         rc = kstrtoul(buf, 0, &count);
 785         if (rc < 0)
 786                 return rc;
 787
 788         if (count) {
 789                 mask = count - 1;
 790                 /* mask = roundup_pow_of_two(count) - 1;
 791                  * without overflows...
 792                  */
 793                 while ((mask | (mask >> 1)) != mask)
 794                         mask |= (mask >> 1);
 795                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 796                  * and on 32bit arches, must check
 797                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 798                  */
 799 #if BITS_PER_LONG > 32
 800                 if (mask > (unsigned long)(u32)mask)
 801                         return -EINVAL;
 802 #else
 803                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 804                                 / sizeof(struct rps_dev_flow)) {
 805                         /* Enforce a limit to prevent overflow */
 806                         return -EINVAL;
 807                 }
 808 #endif
 809                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 810                 if (!table)
 811                         return -ENOMEM;
 812
 813                 table->mask = mask;
 814                 for (count = 0; count <= mask; count++)
 815                         table->flows[count].cpu = RPS_NO_CPU;
 816         } else
 817                 table = NULL;
 818
 819         spin_lock(&rps_dev_flow_lock);
 820         old_table = rcu_dereference_protected(queue->rps_flow_table,
 821                                               lockdep_is_held(&rps_dev_flow_lock));
 822         rcu_assign_pointer(queue->rps_flow_table, table);
 823         spin_unlock(&rps_dev_flow_lock);
 824
 825         if (old_table)
 826                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 827
 828         return len;
 829 }
 830
 831 static struct rx_queue_attribute rps_cpus_attribute =
 832         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 833
 834
 835 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 836         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 837             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 838 #endif /* CONFIG_RPS */
 839
 840 static struct attribute *rx_queue_default_attrs[] = {
 841 #ifdef CONFIG_RPS
 842         &rps_cpus_attribute.attr,
 843         &rps_dev_flow_table_cnt_attribute.attr,
 844 #endif
 845         NULL
 846 };
 847
 848 static void rx_queue_release(struct kobject *kobj)
 849 {
 850         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 851 #ifdef CONFIG_RPS
 852         struct rps_map *map;
 853         struct rps_dev_flow_table *flow_table;
 854
 855
 856         map = rcu_dereference_protected(queue->rps_map, 1);
 857         if (map) {
 858                 RCU_INIT_POINTER(queue->rps_map, NULL);
 859                 kfree_rcu(map, rcu);
 860         }
 861
 862         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 863         if (flow_table) {
 864                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 865                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 866         }
 867 #endif
 868
 869         memset(kobj, 0, sizeof(*kobj));
 870         dev_put(queue->dev);
 871 }
 872
 873 static const void *rx_queue_namespace(struct kobject *kobj)
 874 {
 875         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 876         struct device *dev = &queue->dev->dev;
 877         const void *ns = NULL;
 878
 879         if (dev->class && dev->class->ns_type)
 880                 ns = dev->class->namespace(dev);
 881
 882         return ns;
 883 }
 884
 885 static struct kobj_type rx_queue_ktype = {
 886         .sysfs_ops = &rx_queue_sysfs_ops,
 887         .release = rx_queue_release,
 888         .default_attrs = rx_queue_default_attrs,
 889         .namespace = rx_queue_namespace
 890 };
 891
 892 static int rx_queue_add_kobject(struct net_device *dev, int index)
 893 {
 894         struct netdev_rx_queue *queue = dev->_rx + index;
 895         struct kobject *kobj = &queue->kobj;
 896         int error = 0;
 897
 898         kobj->kset = dev->queues_kset;
 899         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 900             "rx-%u", index);
 901         if (error)
 902                 goto exit;
 903
 904         if (dev->sysfs_rx_queue_group) {
 905                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
 906                 if (error)
 907                         goto exit;
 908         }
 909
 910         kobject_uevent(kobj, KOBJ_ADD);
 911         dev_hold(queue->dev);
 912
 913         return error;
 914 exit:
 915         kobject_put(kobj);
 916         return error;
 917 }
 918 #endif /* CONFIG_SYSFS */
 919
 920 int
 921 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
 922 {
 923 #ifdef CONFIG_SYSFS
 924         int i;
 925         int error = 0;
 926
 927 #ifndef CONFIG_RPS
 928         if (!dev->sysfs_rx_queue_group)
 929                 return 0;
 930 #endif
 931         for (i = old_num; i < new_num; i++) {
 932                 error = rx_queue_add_kobject(dev, i);
 933                 if (error) {
 934                         new_num = old_num;
 935                         break;
 936                 }
 937         }
 938
 939         while (--i >= new_num) {
 940                 if (dev->sysfs_rx_queue_group)
 941                         sysfs_remove_group(&dev->_rx[i].kobj,
 942                                            dev->sysfs_rx_queue_group);
 943                 kobject_put(&dev->_rx[i].kobj);
 944         }
 945
 946         return error;
 947 #else
 948         return 0;
 949 #endif
 950 }
 951
 952 #ifdef CONFIG_SYSFS
 953 /*
 954  * netdev_queue sysfs structures and functions.
 955  */
 956 struct netdev_queue_attribute {
 957         struct attribute attr;
 958         ssize_t (*show)(struct netdev_queue *queue,
 959             struct netdev_queue_attribute *attr, char *buf);
 960         ssize_t (*store)(struct netdev_queue *queue,
 961             struct netdev_queue_attribute *attr, const char *buf, size_t len);
 962 };
 963 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
 964     struct netdev_queue_attribute, attr)
 965
 966 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 967
 968 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 969                                       struct attribute *attr, char *buf)
 970 {
 971         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 972         struct netdev_queue *queue = to_netdev_queue(kobj);
 973
 974         if (!attribute->show)
 975                 return -EIO;
 976
 977         return attribute->show(queue, attribute, buf);
 978 }
 979
 980 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 981                                        struct attribute *attr,
 982                                        const char *buf, size_t count)
 983 {
 984         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 985         struct netdev_queue *queue = to_netdev_queue(kobj);
 986
 987         if (!attribute->store)
 988                 return -EIO;
 989
 990         return attribute->store(queue, attribute, buf, count);
 991 }
 992
 993 static const struct sysfs_ops netdev_queue_sysfs_ops = {
 994         .show = netdev_queue_attr_show,
 995         .store = netdev_queue_attr_store,
 996 };
 997
 998 static ssize_t show_trans_timeout(struct netdev_queue *queue,
 999                                   struct netdev_queue_attribute *attribute,
1000                                   char *buf)
1001 {
1002         unsigned long trans_timeout;
1003
1004         spin_lock_irq(&queue->_xmit_lock);
1005         trans_timeout = queue->trans_timeout;
1006         spin_unlock_irq(&queue->_xmit_lock);
1007
1008         return sprintf(buf, "%lu", trans_timeout);
1009 }
1010
1011 #ifdef CONFIG_XPS
1012 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1013 {
1014         struct net_device *dev = queue->dev;
1015         unsigned int i;
1016
1017         i = queue - dev->_tx;
1018         BUG_ON(i >= dev->num_tx_queues);
1019
1020         return i;
1021 }
1022
1023 static ssize_t show_tx_maxrate(struct netdev_queue *queue,
1024                                struct netdev_queue_attribute *attribute,
1025                                char *buf)
1026 {
1027         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1028 }
1029
1030 static ssize_t set_tx_maxrate(struct netdev_queue *queue,
1031                               struct netdev_queue_attribute *attribute,
1032                               const char *buf, size_t len)
1033 {
1034         struct net_device *dev = queue->dev;
1035         int err, index = get_netdev_queue_index(queue);
1036         u32 rate = 0;
1037
1038         err = kstrtou32(buf, 10, &rate);
1039         if (err < 0)
1040                 return err;
1041
1042         if (!rtnl_trylock())
1043                 return restart_syscall();
1044
1045         err = -EOPNOTSUPP;
1046         if (dev->netdev_ops->ndo_set_tx_maxrate)
1047                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1048
1049         rtnl_unlock();
1050         if (!err) {
1051                 queue->tx_maxrate = rate;
1052                 return len;
1053         }
1054         return err;
1055 }
1056
1057 static struct netdev_queue_attribute queue_tx_maxrate =
1058         __ATTR(tx_maxrate, S_IRUGO | S_IWUSR,
1059                show_tx_maxrate, set_tx_maxrate);
1060 #endif
1061
1062 static struct netdev_queue_attribute queue_trans_timeout =
1063         __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
1064
1065 #ifdef CONFIG_BQL
1066 /*
1067  * Byte queue limits sysfs structures and functions.
1068  */
1069 static ssize_t bql_show(char *buf, unsigned int value)
1070 {
1071         return sprintf(buf, "%u\n", value);
1072 }
1073
1074 static ssize_t bql_set(const char *buf, const size_t count,
1075                        unsigned int *pvalue)
1076 {
1077         unsigned int value;
1078         int err;
1079
1080         if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
1081                 value = DQL_MAX_LIMIT;
1082         else {
1083                 err = kstrtouint(buf, 10, &value);
1084                 if (err < 0)
1085                         return err;
1086                 if (value > DQL_MAX_LIMIT)
1087                         return -EINVAL;
1088         }
1089
1090         *pvalue = value;
1091
1092         return count;
1093 }
1094
1095 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1096                                   struct netdev_queue_attribute *attr,
1097                                   char *buf)
1098 {
1099         struct dql *dql = &queue->dql;
1100
1101         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1102 }
1103
1104 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1105                                  struct netdev_queue_attribute *attribute,
1106                                  const char *buf, size_t len)
1107 {
1108         struct dql *dql = &queue->dql;
1109         unsigned int value;
1110         int err;
1111
1112         err = kstrtouint(buf, 10, &value);
1113         if (err < 0)
1114                 return err;
1115
1116         dql->slack_hold_time = msecs_to_jiffies(value);
1117
1118         return len;
1119 }
1120
1121 static struct netdev_queue_attribute bql_hold_time_attribute =
1122         __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
1123             bql_set_hold_time);
1124
1125 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1126                                  struct netdev_queue_attribute *attr,
1127                                  char *buf)
1128 {
1129         struct dql *dql = &queue->dql;
1130
1131         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1132 }
1133
1134 static struct netdev_queue_attribute bql_inflight_attribute =
1135         __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1136
1137 #define BQL_ATTR(NAME, FIELD)                                           \
1138 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1139                                  struct netdev_queue_attribute *attr,   \
1140                                  char *buf)                             \
1141 {                                                                       \
1142         return bql_show(buf, queue->dql.FIELD);                         \
1143 }                                                                       \
1144                                                                         \
1145 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1146                                 struct netdev_queue_attribute *attr,    \
1147                                 const char *buf, size_t len)            \
1148 {                                                                       \
1149         return bql_set(buf, len, &queue->dql.FIELD);                    \
1150 }                                                                       \
1151                                                                         \
1152 static struct netdev_queue_attribute bql_ ## NAME ## _attribute =       \
1153         __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME,              \
1154             bql_set_ ## NAME);
1155
1156 BQL_ATTR(limit, limit)
1157 BQL_ATTR(limit_max, max_limit)
1158 BQL_ATTR(limit_min, min_limit)
1159
1160 static struct attribute *dql_attrs[] = {
1161         &bql_limit_attribute.attr,
1162         &bql_limit_max_attribute.attr,
1163         &bql_limit_min_attribute.attr,
1164         &bql_hold_time_attribute.attr,
1165         &bql_inflight_attribute.attr,
1166         NULL
1167 };
1168
1169 static struct attribute_group dql_group = {
1170         .name  = "byte_queue_limits",
1171         .attrs  = dql_attrs,
1172 };
1173 #endif /* CONFIG_BQL */
1174
1175 #ifdef CONFIG_XPS
1176 static ssize_t show_xps_map(struct netdev_queue *queue,
1177                             struct netdev_queue_attribute *attribute, char *buf)
1178 {
1179         struct net_device *dev = queue->dev;
1180         struct xps_dev_maps *dev_maps;
1181         cpumask_var_t mask;
1182         unsigned long index;
1183         int i, len;
1184
1185         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1186                 return -ENOMEM;
1187
1188         index = get_netdev_queue_index(queue);
1189
1190         rcu_read_lock();
1191         dev_maps = rcu_dereference(dev->xps_maps);
1192         if (dev_maps) {
1193                 for_each_possible_cpu(i) {
1194                         struct xps_map *map =
1195                             rcu_dereference(dev_maps->cpu_map[i]);
1196                         if (map) {
1197                                 int j;
1198                                 for (j = 0; j < map->len; j++) {
1199                                         if (map->queues[j] == index) {
1200                                                 cpumask_set_cpu(i, mask);
1201                                                 break;
1202                                         }
1203                                 }
1204                         }
1205                 }
1206         }
1207         rcu_read_unlock();
1208
1209         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1210         free_cpumask_var(mask);
1211         return len < PAGE_SIZE ? len : -EINVAL;
1212 }
1213
1214 static ssize_t store_xps_map(struct netdev_queue *queue,
1215                       struct netdev_queue_attribute *attribute,
1216                       const char *buf, size_t len)
1217 {
1218         struct net_device *dev = queue->dev;
1219         unsigned long index;
1220         cpumask_var_t mask;
1221         int err;
1222
1223         if (!capable(CAP_NET_ADMIN))
1224                 return -EPERM;
1225
1226         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1227                 return -ENOMEM;
1228
1229         index = get_netdev_queue_index(queue);
1230
1231         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1232         if (err) {
1233                 free_cpumask_var(mask);
1234                 return err;
1235         }
1236
1237         err = netif_set_xps_queue(dev, mask, index);
1238
1239         free_cpumask_var(mask);
1240
1241         return err ? : len;
1242 }
1243
1244 static struct netdev_queue_attribute xps_cpus_attribute =
1245     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1246 #endif /* CONFIG_XPS */
1247
1248 static struct attribute *netdev_queue_default_attrs[] = {
1249         &queue_trans_timeout.attr,
1250 #ifdef CONFIG_XPS
1251         &xps_cpus_attribute.attr,
1252         &queue_tx_maxrate.attr,
1253 #endif
1254         NULL
1255 };
1256
1257 static void netdev_queue_release(struct kobject *kobj)
1258 {
1259         struct netdev_queue *queue = to_netdev_queue(kobj);
1260
1261         memset(kobj, 0, sizeof(*kobj));
1262         dev_put(queue->dev);
1263 }
1264
1265 static const void *netdev_queue_namespace(struct kobject *kobj)
1266 {
1267         struct netdev_queue *queue = to_netdev_queue(kobj);
1268         struct device *dev = &queue->dev->dev;
1269         const void *ns = NULL;
1270
1271         if (dev->class && dev->class->ns_type)
1272                 ns = dev->class->namespace(dev);
1273
1274         return ns;
1275 }
1276
1277 static struct kobj_type netdev_queue_ktype = {
1278         .sysfs_ops = &netdev_queue_sysfs_ops,
1279         .release = netdev_queue_release,
1280         .default_attrs = netdev_queue_default_attrs,
1281         .namespace = netdev_queue_namespace,
1282 };
1283
1284 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1285 {
1286         struct netdev_queue *queue = dev->_tx + index;
1287         struct kobject *kobj = &queue->kobj;
1288         int error = 0;
1289
1290         kobj->kset = dev->queues_kset;
1291         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1292             "tx-%u", index);
1293         if (error)
1294                 goto exit;
1295
1296 #ifdef CONFIG_BQL
1297         error = sysfs_create_group(kobj, &dql_group);
1298         if (error)
1299                 goto exit;
1300 #endif
1301
1302         kobject_uevent(kobj, KOBJ_ADD);
1303         dev_hold(queue->dev);
1304
1305         return 0;
1306 exit:
1307         kobject_put(kobj);
1308         return error;
1309 }
1310 #endif /* CONFIG_SYSFS */
1311
1312 int
1313 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1314 {
1315 #ifdef CONFIG_SYSFS
1316         int i;
1317         int error = 0;
1318
1319         for (i = old_num; i < new_num; i++) {
1320                 error = netdev_queue_add_kobject(dev, i);
1321                 if (error) {
1322                         new_num = old_num;
1323                         break;
1324                 }
1325         }
1326
1327         while (--i >= new_num) {
1328                 struct netdev_queue *queue = dev->_tx + i;
1329
1330 #ifdef CONFIG_BQL
1331                 sysfs_remove_group(&queue->kobj, &dql_group);
1332 #endif
1333                 kobject_put(&queue->kobj);
1334         }
1335
1336         return error;
1337 #else
1338         return 0;
1339 #endif /* CONFIG_SYSFS */
1340 }
1341
1342 static int register_queue_kobjects(struct net_device *dev)
1343 {
1344         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1345
1346 #ifdef CONFIG_SYSFS
1347         dev->queues_kset = kset_create_and_add("queues",
1348             NULL, &dev->dev.kobj);
1349         if (!dev->queues_kset)
1350                 return -ENOMEM;
1351         real_rx = dev->real_num_rx_queues;
1352 #endif
1353         real_tx = dev->real_num_tx_queues;
1354
1355         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1356         if (error)
1357                 goto error;
1358         rxq = real_rx;
1359
1360         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1361         if (error)
1362                 goto error;
1363         txq = real_tx;
1364
1365         return 0;
1366
1367 error:
1368         netdev_queue_update_kobjects(dev, txq, 0);
1369         net_rx_queue_update_kobjects(dev, rxq, 0);
1370         return error;
1371 }
1372
1373 static void remove_queue_kobjects(struct net_device *dev)
1374 {
1375         int real_rx = 0, real_tx = 0;
1376
1377 #ifdef CONFIG_SYSFS
1378         real_rx = dev->real_num_rx_queues;
1379 #endif
1380         real_tx = dev->real_num_tx_queues;
1381
1382         net_rx_queue_update_kobjects(dev, real_rx, 0);
1383         netdev_queue_update_kobjects(dev, real_tx, 0);
1384 #ifdef CONFIG_SYSFS
1385         kset_unregister(dev->queues_kset);
1386 #endif
1387 }
1388
1389 static bool net_current_may_mount(void)
1390 {
1391         struct net *net = current->nsproxy->net_ns;
1392
1393         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1394 }
1395
1396 static void *net_grab_current_ns(void)
1397 {
1398         struct net *ns = current->nsproxy->net_ns;
1399 #ifdef CONFIG_NET_NS
1400         if (ns)
1401                 atomic_inc(&ns->passive);
1402 #endif
1403         return ns;
1404 }
1405
1406 static const void *net_initial_ns(void)
1407 {
1408         return &init_net;
1409 }
1410
1411 static const void *net_netlink_ns(struct sock *sk)
1412 {
1413         return sock_net(sk);
1414 }
1415
1416 struct kobj_ns_type_operations net_ns_type_operations = {
1417         .type = KOBJ_NS_TYPE_NET,
1418         .current_may_mount = net_current_may_mount,
1419         .grab_current_ns = net_grab_current_ns,
1420         .netlink_ns = net_netlink_ns,
1421         .initial_ns = net_initial_ns,
1422         .drop_ns = net_drop_ns,
1423 };
1424 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1425
1426 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1427 {
1428         struct net_device *dev = to_net_dev(d);
1429         int retval;
1430
1431         /* pass interface to uevent. */
1432         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1433         if (retval)
1434                 goto exit;
1435
1436         /* pass ifindex to uevent.
1437          * ifindex is useful as it won't change (interface name may change)
1438          * and is what RtNetlink uses natively. */
1439         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1440
1441 exit:
1442         return retval;
1443 }
1444
1445 /*
1446  *      netdev_release -- destroy and free a dead device.
1447  *      Called when last reference to device kobject is gone.
1448  */
1449 static void netdev_release(struct device *d)
1450 {
1451         struct net_device *dev = to_net_dev(d);
1452
1453         BUG_ON(dev->reg_state != NETREG_RELEASED);
1454
1455         kfree(dev->ifalias);
1456         netdev_freemem(dev);
1457 }
1458
1459 static const void *net_namespace(struct device *d)
1460 {
1461         struct net_device *dev = to_net_dev(d);
1462
1463         return dev_net(dev);
1464 }
1465
1466 static struct class net_class = {
1467         .name = "net",
1468         .dev_release = netdev_release,
1469         .dev_groups = net_class_groups,
1470         .dev_uevent = netdev_uevent,
1471         .ns_type = &net_ns_type_operations,
1472         .namespace = net_namespace,
1473 };
1474
1475 #ifdef CONFIG_OF_NET
1476 static int of_dev_node_match(struct device *dev, const void *data)
1477 {
1478         int ret = 0;
1479
1480         if (dev->parent)
1481                 ret = dev->parent->of_node == data;
1482
1483         return ret == 0 ? dev->of_node == data : ret;
1484 }
1485
1486 /*
1487  * of_find_net_device_by_node - lookup the net device for the device node
1488  * @np: OF device node
1489  *
1490  * Looks up the net_device structure corresponding with the device node.
1491  * If successful, returns a pointer to the net_device with the embedded
1492  * struct device refcount incremented by one, or NULL on failure. The
1493  * refcount must be dropped when done with the net_device.
1494  */
1495 struct net_device *of_find_net_device_by_node(struct device_node *np)
1496 {
1497         struct device *dev;
1498
1499         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1500         if (!dev)
1501                 return NULL;
1502
1503         return to_net_dev(dev);
1504 }
1505 EXPORT_SYMBOL(of_find_net_device_by_node);
1506 #endif
1507
1508 /* Delete sysfs entries but hold kobject reference until after all
1509  * netdev references are gone.
1510  */
1511 void netdev_unregister_kobject(struct net_device *ndev)
1512 {
1513         struct device *dev = &(ndev->dev);
1514
1515         kobject_get(&dev->kobj);
1516
1517         remove_queue_kobjects(ndev);
1518
1519         pm_runtime_set_memalloc_noio(dev, false);
1520
1521         device_del(dev);
1522 }
1523
1524 /* Create sysfs entries for network device. */
1525 int netdev_register_kobject(struct net_device *ndev)
1526 {
1527         struct device *dev = &(ndev->dev);
1528         const struct attribute_group **groups = ndev->sysfs_groups;
1529         int error = 0;
1530
1531         device_initialize(dev);
1532         dev->class = &net_class;
1533         dev->platform_data = ndev;
1534         dev->groups = groups;
1535
1536         dev_set_name(dev, "%s", ndev->name);
1537
1538 #ifdef CONFIG_SYSFS
1539         /* Allow for a device specific group */
1540         if (*groups)
1541                 groups++;
1542
1543         *groups++ = &netstat_group;
1544
1545 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1546         if (ndev->ieee80211_ptr)
1547                 *groups++ = &wireless_group;
1548 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1549         else if (ndev->wireless_handlers)
1550                 *groups++ = &wireless_group;
1551 #endif
1552 #endif
1553 #endif /* CONFIG_SYSFS */
1554
1555         error = device_add(dev);
1556         if (error)
1557                 return error;
1558
1559         error = register_queue_kobjects(ndev);
1560         if (error) {
1561                 device_del(dev);
1562                 return error;
1563         }
1564
1565         pm_runtime_set_memalloc_noio(dev, true);
1566
1567         return error;
1568 }
1569
1570 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1571                                 const void *ns)
1572 {
1573         return class_create_file_ns(&net_class, class_attr, ns);
1574 }
1575 EXPORT_SYMBOL(netdev_class_create_file_ns);
1576
1577 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1578                                  const void *ns)
1579 {
1580         class_remove_file_ns(&net_class, class_attr, ns);
1581 }
1582 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1583
1584 int __init netdev_kobject_init(void)
1585 {
1586         kobj_ns_type_register(&net_ns_type_operations);
1587         return class_register(&net_class);
1588 }