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
  28 #include "net-sysfs.h"
  29
  30 #ifdef CONFIG_SYSFS
  31 static const char fmt_hex[] = "%#x\n";
  32 static const char fmt_long_hex[] = "%#lx\n";
  33 static const char fmt_dec[] = "%d\n";
  34 static const char fmt_udec[] = "%u\n";
  35 static const char fmt_ulong[] = "%lu\n";
  36 static const char fmt_u64[] = "%llu\n";
  37
  38 static inline int dev_isalive(const struct net_device *dev)
  39 {
  40         return dev->reg_state <= NETREG_REGISTERED;
  41 }
  42
  43 /* use same locking rules as GIF* ioctl's */
  44 static ssize_t netdev_show(const struct device *dev,
  45                            struct device_attribute *attr, char *buf,
  46                            ssize_t (*format)(const struct net_device *, char *))
  47 {
  48         struct net_device *ndev = to_net_dev(dev);
  49         ssize_t ret = -EINVAL;
  50
  51         read_lock(&dev_base_lock);
  52         if (dev_isalive(ndev))
  53                 ret = (*format)(ndev, buf);
  54         read_unlock(&dev_base_lock);
  55
  56         return ret;
  57 }
  58
  59 /* generate a show function for simple field */
  60 #define NETDEVICE_SHOW(field, format_string)                            \
  61 static ssize_t format_##field(const struct net_device *dev, char *buf)  \
  62 {                                                                       \
  63         return sprintf(buf, format_string, dev->field);                 \
  64 }                                                                       \
  65 static ssize_t field##_show(struct device *dev,                         \
  66                             struct device_attribute *attr, char *buf)   \
  67 {                                                                       \
  68         return netdev_show(dev, attr, buf, format_##field);             \
  69 }                                                                       \
  70
  71 #define NETDEVICE_SHOW_RO(field, format_string)                         \
  72 NETDEVICE_SHOW(field, format_string);                                   \
  73 static DEVICE_ATTR_RO(field)
  74
  75 #define NETDEVICE_SHOW_RW(field, format_string)                         \
  76 NETDEVICE_SHOW(field, format_string);                                   \
  77 static DEVICE_ATTR_RW(field)
  78
  79 /* use same locking and permission rules as SIF* ioctl's */
  80 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  81                             const char *buf, size_t len,
  82                             int (*set)(struct net_device *, unsigned long))
  83 {
  84         struct net_device *netdev = to_net_dev(dev);
  85         struct net *net = dev_net(netdev);
  86         unsigned long new;
  87         int ret = -EINVAL;
  88
  89         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  90                 return -EPERM;
  91
  92         ret = kstrtoul(buf, 0, &new);
  93         if (ret)
  94                 goto err;
  95
  96         if (!rtnl_trylock())
  97                 return restart_syscall();
  98
  99         if (dev_isalive(netdev)) {
 100                 if ((ret = (*set)(netdev, new)) == 0)
 101                         ret = len;
 102         }
 103         rtnl_unlock();
 104  err:
 105         return ret;
 106 }
 107
 108 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 109 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 110 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 111 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 112 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 113 NETDEVICE_SHOW_RO(type, fmt_dec);
 114 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 115
 116 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
 117                            char *buf)
 118 {
 119         struct net_device *ndev = to_net_dev(dev);
 120
 121         return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
 122 }
 123 static DEVICE_ATTR_RO(iflink);
 124
 125 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 126 {
 127         return sprintf(buf, fmt_dec, dev->name_assign_type);
 128 }
 129
 130 static ssize_t name_assign_type_show(struct device *dev,
 131                                      struct device_attribute *attr,
 132                                      char *buf)
 133 {
 134         struct net_device *ndev = to_net_dev(dev);
 135         ssize_t ret = -EINVAL;
 136
 137         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
 138                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
 139
 140         return ret;
 141 }
 142 static DEVICE_ATTR_RO(name_assign_type);
 143
 144 /* use same locking rules as GIFHWADDR ioctl's */
 145 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 146                             char *buf)
 147 {
 148         struct net_device *ndev = to_net_dev(dev);
 149         ssize_t ret = -EINVAL;
 150
 151         read_lock(&dev_base_lock);
 152         if (dev_isalive(ndev))
 153                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 154         read_unlock(&dev_base_lock);
 155         return ret;
 156 }
 157 static DEVICE_ATTR_RO(address);
 158
 159 static ssize_t broadcast_show(struct device *dev,
 160                               struct device_attribute *attr, char *buf)
 161 {
 162         struct net_device *ndev = to_net_dev(dev);
 163         if (dev_isalive(ndev))
 164                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
 165         return -EINVAL;
 166 }
 167 static DEVICE_ATTR_RO(broadcast);
 168
 169 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
 170 {
 171         if (!netif_running(dev))
 172                 return -EINVAL;
 173         return dev_change_carrier(dev, (bool) new_carrier);
 174 }
 175
 176 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 177                              const char *buf, size_t len)
 178 {
 179         return netdev_store(dev, attr, buf, len, change_carrier);
 180 }
 181
 182 static ssize_t carrier_show(struct device *dev,
 183                             struct device_attribute *attr, char *buf)
 184 {
 185         struct net_device *netdev = to_net_dev(dev);
 186         if (netif_running(netdev)) {
 187                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 188         }
 189         return -EINVAL;
 190 }
 191 static DEVICE_ATTR_RW(carrier);
 192
 193 static ssize_t speed_show(struct device *dev,
 194                           struct device_attribute *attr, char *buf)
 195 {
 196         struct net_device *netdev = to_net_dev(dev);
 197         int ret = -EINVAL;
 198
 199         if (!rtnl_trylock())
 200                 return restart_syscall();
 201
 202         if (netif_running(netdev)) {
 203                 struct ethtool_cmd cmd;
 204                 if (!__ethtool_get_settings(netdev, &cmd))
 205                         ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
 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_cmd cmd;
 223                 if (!__ethtool_get_settings(netdev, &cmd)) {
 224                         const char *duplex;
 225                         switch (cmd.duplex) {
 226                         case DUPLEX_HALF:
 227                                 duplex = "half";
 228                                 break;
 229                         case DUPLEX_FULL:
 230                                 duplex = "full";
 231                                 break;
 232                         default:
 233                                 duplex = "unknown";
 234                                 break;
 235                         }
 236                         ret = sprintf(buf, "%s\n", duplex);
 237                 }
 238         }
 239         rtnl_unlock();
 240         return ret;
 241 }
 242 static DEVICE_ATTR_RO(duplex);
 243
 244 static ssize_t dormant_show(struct device *dev,
 245                             struct device_attribute *attr, char *buf)
 246 {
 247         struct net_device *netdev = to_net_dev(dev);
 248
 249         if (netif_running(netdev))
 250                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 251
 252         return -EINVAL;
 253 }
 254 static DEVICE_ATTR_RO(dormant);
 255
 256 static const char *const operstates[] = {
 257         "unknown",
 258         "notpresent", /* currently unused */
 259         "down",
 260         "lowerlayerdown",
 261         "testing", /* currently unused */
 262         "dormant",
 263         "up"
 264 };
 265
 266 static ssize_t operstate_show(struct device *dev,
 267                               struct device_attribute *attr, char *buf)
 268 {
 269         const struct net_device *netdev = to_net_dev(dev);
 270         unsigned char operstate;
 271
 272         read_lock(&dev_base_lock);
 273         operstate = netdev->operstate;
 274         if (!netif_running(netdev))
 275                 operstate = IF_OPER_DOWN;
 276         read_unlock(&dev_base_lock);
 277
 278         if (operstate >= ARRAY_SIZE(operstates))
 279                 return -EINVAL; /* should not happen */
 280
 281         return sprintf(buf, "%s\n", operstates[operstate]);
 282 }
 283 static DEVICE_ATTR_RO(operstate);
 284
 285 static ssize_t carrier_changes_show(struct device *dev,
 286                                     struct device_attribute *attr,
 287                                     char *buf)
 288 {
 289         struct net_device *netdev = to_net_dev(dev);
 290         return sprintf(buf, fmt_dec,
 291                        atomic_read(&netdev->carrier_changes));
 292 }
 293 static DEVICE_ATTR_RO(carrier_changes);
 294
 295 /* read-write attributes */
 296
 297 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 298 {
 299         return dev_set_mtu(dev, (int) new_mtu);
 300 }
 301
 302 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 303                          const char *buf, size_t len)
 304 {
 305         return netdev_store(dev, attr, buf, len, change_mtu);
 306 }
 307 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 308
 309 static int change_flags(struct net_device *dev, unsigned long new_flags)
 310 {
 311         return dev_change_flags(dev, (unsigned int) new_flags);
 312 }
 313
 314 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 315                            const char *buf, size_t len)
 316 {
 317         return netdev_store(dev, attr, buf, len, change_flags);
 318 }
 319 NETDEVICE_SHOW_RW(flags, fmt_hex);
 320
 321 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
 322 {
 323         dev->tx_queue_len = new_len;
 324         return 0;
 325 }
 326
 327 static ssize_t tx_queue_len_store(struct device *dev,
 328                                   struct device_attribute *attr,
 329                                   const char *buf, size_t len)
 330 {
 331         if (!capable(CAP_NET_ADMIN))
 332                 return -EPERM;
 333
 334         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
 335 }
 336 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
 337
 338 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 339 {
 340         dev->gro_flush_timeout = val;
 341         return 0;
 342 }
 343
 344 static ssize_t gro_flush_timeout_store(struct device *dev,
 345                                   struct device_attribute *attr,
 346                                   const char *buf, size_t len)
 347 {
 348         if (!capable(CAP_NET_ADMIN))
 349                 return -EPERM;
 350
 351         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 352 }
 353 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 354
 355 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 356                              const char *buf, size_t len)
 357 {
 358         struct net_device *netdev = to_net_dev(dev);
 359         struct net *net = dev_net(netdev);
 360         size_t count = len;
 361         ssize_t ret;
 362
 363         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 364                 return -EPERM;
 365
 366         /* ignore trailing newline */
 367         if (len >  0 && buf[len - 1] == '\n')
 368                 --count;
 369
 370         if (!rtnl_trylock())
 371                 return restart_syscall();
 372         ret = dev_set_alias(netdev, buf, count);
 373         rtnl_unlock();
 374
 375         return ret < 0 ? ret : len;
 376 }
 377
 378 static ssize_t ifalias_show(struct device *dev,
 379                             struct device_attribute *attr, char *buf)
 380 {
 381         const struct net_device *netdev = to_net_dev(dev);
 382         ssize_t ret = 0;
 383
 384         if (!rtnl_trylock())
 385                 return restart_syscall();
 386         if (netdev->ifalias)
 387                 ret = sprintf(buf, "%s\n", netdev->ifalias);
 388         rtnl_unlock();
 389         return ret;
 390 }
 391 static DEVICE_ATTR_RW(ifalias);
 392
 393 static int change_group(struct net_device *dev, unsigned long new_group)
 394 {
 395         dev_set_group(dev, (int) new_group);
 396         return 0;
 397 }
 398
 399 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 400                            const char *buf, size_t len)
 401 {
 402         return netdev_store(dev, attr, buf, len, change_group);
 403 }
 404 NETDEVICE_SHOW(group, fmt_dec);
 405 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
 406
 407 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 408 {
 409         return dev_change_proto_down(dev, (bool) proto_down);
 410 }
 411
 412 static ssize_t proto_down_store(struct device *dev,
 413                                 struct device_attribute *attr,
 414                                 const char *buf, size_t len)
 415 {
 416         return netdev_store(dev, attr, buf, len, change_proto_down);
 417 }
 418 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 419
 420 static ssize_t phys_port_id_show(struct device *dev,
 421                                  struct device_attribute *attr, char *buf)
 422 {
 423         struct net_device *netdev = to_net_dev(dev);
 424         ssize_t ret = -EINVAL;
 425
 426         if (!rtnl_trylock())
 427                 return restart_syscall();
 428
 429         if (dev_isalive(netdev)) {
 430                 struct netdev_phys_item_id ppid;
 431
 432                 ret = dev_get_phys_port_id(netdev, &ppid);
 433                 if (!ret)
 434                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 435         }
 436         rtnl_unlock();
 437
 438         return ret;
 439 }
 440 static DEVICE_ATTR_RO(phys_port_id);
 441
 442 static ssize_t phys_port_name_show(struct device *dev,
 443                                    struct device_attribute *attr, char *buf)
 444 {
 445         struct net_device *netdev = to_net_dev(dev);
 446         ssize_t ret = -EINVAL;
 447
 448         if (!rtnl_trylock())
 449                 return restart_syscall();
 450
 451         if (dev_isalive(netdev)) {
 452                 char name[IFNAMSIZ];
 453
 454                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 455                 if (!ret)
 456                         ret = sprintf(buf, "%s\n", name);
 457         }
 458         rtnl_unlock();
 459
 460         return ret;
 461 }
 462 static DEVICE_ATTR_RO(phys_port_name);
 463
 464 static ssize_t phys_switch_id_show(struct device *dev,
 465                                    struct device_attribute *attr, char *buf)
 466 {
 467         struct net_device *netdev = to_net_dev(dev);
 468         ssize_t ret = -EINVAL;
 469
 470         if (!rtnl_trylock())
 471                 return restart_syscall();
 472
 473         if (dev_isalive(netdev)) {
 474                 struct switchdev_attr attr = {
 475                         .id = SWITCHDEV_ATTR_PORT_PARENT_ID,
 476                         .flags = SWITCHDEV_F_NO_RECURSE,
 477                 };
 478
 479                 ret = switchdev_port_attr_get(netdev, &attr);
 480                 if (!ret)
 481                         ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
 482                                       attr.u.ppid.id);
 483         }
 484         rtnl_unlock();
 485
 486         return ret;
 487 }
 488 static DEVICE_ATTR_RO(phys_switch_id);
 489
 490 static struct attribute *net_class_attrs[] = {
 491         &dev_attr_netdev_group.attr,
 492         &dev_attr_type.attr,
 493         &dev_attr_dev_id.attr,
 494         &dev_attr_dev_port.attr,
 495         &dev_attr_iflink.attr,
 496         &dev_attr_ifindex.attr,
 497         &dev_attr_name_assign_type.attr,
 498         &dev_attr_addr_assign_type.attr,
 499         &dev_attr_addr_len.attr,
 500         &dev_attr_link_mode.attr,
 501         &dev_attr_address.attr,
 502         &dev_attr_broadcast.attr,
 503         &dev_attr_speed.attr,
 504         &dev_attr_duplex.attr,
 505         &dev_attr_dormant.attr,
 506         &dev_attr_operstate.attr,
 507         &dev_attr_carrier_changes.attr,
 508         &dev_attr_ifalias.attr,
 509         &dev_attr_carrier.attr,
 510         &dev_attr_mtu.attr,
 511         &dev_attr_flags.attr,
 512         &dev_attr_tx_queue_len.attr,
 513         &dev_attr_gro_flush_timeout.attr,
 514         &dev_attr_phys_port_id.attr,
 515         &dev_attr_phys_port_name.attr,
 516         &dev_attr_phys_switch_id.attr,
 517         &dev_attr_proto_down.attr,
 518         NULL,
 519 };
 520 ATTRIBUTE_GROUPS(net_class);
 521
 522 /* Show a given an attribute in the statistics group */
 523 static ssize_t netstat_show(const struct device *d,
 524                             struct device_attribute *attr, char *buf,
 525                             unsigned long offset)
 526 {
 527         struct net_device *dev = to_net_dev(d);
 528         ssize_t ret = -EINVAL;
 529
 530         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 531                         offset % sizeof(u64) != 0);
 532
 533         read_lock(&dev_base_lock);
 534         if (dev_isalive(dev)) {
 535                 struct rtnl_link_stats64 temp;
 536                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 537
 538                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
 539         }
 540         read_unlock(&dev_base_lock);
 541         return ret;
 542 }
 543
 544 /* generate a read-only statistics attribute */
 545 #define NETSTAT_ENTRY(name)                                             \
 546 static ssize_t name##_show(struct device *d,                            \
 547                            struct device_attribute *attr, char *buf)    \
 548 {                                                                       \
 549         return netstat_show(d, attr, buf,                               \
 550                             offsetof(struct rtnl_link_stats64, name));  \
 551 }                                                                       \
 552 static DEVICE_ATTR_RO(name)
 553
 554 NETSTAT_ENTRY(rx_packets);
 555 NETSTAT_ENTRY(tx_packets);
 556 NETSTAT_ENTRY(rx_bytes);
 557 NETSTAT_ENTRY(tx_bytes);
 558 NETSTAT_ENTRY(rx_errors);
 559 NETSTAT_ENTRY(tx_errors);
 560 NETSTAT_ENTRY(rx_dropped);
 561 NETSTAT_ENTRY(tx_dropped);
 562 NETSTAT_ENTRY(multicast);
 563 NETSTAT_ENTRY(collisions);
 564 NETSTAT_ENTRY(rx_length_errors);
 565 NETSTAT_ENTRY(rx_over_errors);
 566 NETSTAT_ENTRY(rx_crc_errors);
 567 NETSTAT_ENTRY(rx_frame_errors);
 568 NETSTAT_ENTRY(rx_fifo_errors);
 569 NETSTAT_ENTRY(rx_missed_errors);
 570 NETSTAT_ENTRY(tx_aborted_errors);
 571 NETSTAT_ENTRY(tx_carrier_errors);
 572 NETSTAT_ENTRY(tx_fifo_errors);
 573 NETSTAT_ENTRY(tx_heartbeat_errors);
 574 NETSTAT_ENTRY(tx_window_errors);
 575 NETSTAT_ENTRY(rx_compressed);
 576 NETSTAT_ENTRY(tx_compressed);
 577
 578 static struct attribute *netstat_attrs[] = {
 579         &dev_attr_rx_packets.attr,
 580         &dev_attr_tx_packets.attr,
 581         &dev_attr_rx_bytes.attr,
 582         &dev_attr_tx_bytes.attr,
 583         &dev_attr_rx_errors.attr,
 584         &dev_attr_tx_errors.attr,
 585         &dev_attr_rx_dropped.attr,
 586         &dev_attr_tx_dropped.attr,
 587         &dev_attr_multicast.attr,
 588         &dev_attr_collisions.attr,
 589         &dev_attr_rx_length_errors.attr,
 590         &dev_attr_rx_over_errors.attr,
 591         &dev_attr_rx_crc_errors.attr,
 592         &dev_attr_rx_frame_errors.attr,
 593         &dev_attr_rx_fifo_errors.attr,
 594         &dev_attr_rx_missed_errors.attr,
 595         &dev_attr_tx_aborted_errors.attr,
 596         &dev_attr_tx_carrier_errors.attr,
 597         &dev_attr_tx_fifo_errors.attr,
 598         &dev_attr_tx_heartbeat_errors.attr,
 599         &dev_attr_tx_window_errors.attr,
 600         &dev_attr_rx_compressed.attr,
 601         &dev_attr_tx_compressed.attr,
 602         NULL
 603 };
 604
 605
 606 static struct attribute_group netstat_group = {
 607         .name  = "statistics",
 608         .attrs  = netstat_attrs,
 609 };
 610
 611 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 612 static struct attribute *wireless_attrs[] = {
 613         NULL
 614 };
 615
 616 static struct attribute_group wireless_group = {
 617         .name = "wireless",
 618         .attrs = wireless_attrs,
 619 };
 620 #endif
 621
 622 #else /* CONFIG_SYSFS */
 623 #define net_class_groups        NULL
 624 #endif /* CONFIG_SYSFS */
 625
 626 #ifdef CONFIG_SYSFS
 627 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 628     struct rx_queue_attribute, attr)
 629
 630 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 631
 632 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 633                                   char *buf)
 634 {
 635         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 636         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 637
 638         if (!attribute->show)
 639                 return -EIO;
 640
 641         return attribute->show(queue, attribute, buf);
 642 }
 643
 644 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 645                                    const char *buf, size_t count)
 646 {
 647         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 648         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 649
 650         if (!attribute->store)
 651                 return -EIO;
 652
 653         return attribute->store(queue, attribute, buf, count);
 654 }
 655
 656 static const struct sysfs_ops rx_queue_sysfs_ops = {
 657         .show = rx_queue_attr_show,
 658         .store = rx_queue_attr_store,
 659 };
 660
 661 #ifdef CONFIG_RPS
 662 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 663                             struct rx_queue_attribute *attribute, char *buf)
 664 {
 665         struct rps_map *map;
 666         cpumask_var_t mask;
 667         int i, len;
 668
 669         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 670                 return -ENOMEM;
 671
 672         rcu_read_lock();
 673         map = rcu_dereference(queue->rps_map);
 674         if (map)
 675                 for (i = 0; i < map->len; i++)
 676                         cpumask_set_cpu(map->cpus[i], mask);
 677
 678         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 679         rcu_read_unlock();
 680         free_cpumask_var(mask);
 681
 682         return len < PAGE_SIZE ? len : -EINVAL;
 683 }
 684
 685 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 686                       struct rx_queue_attribute *attribute,
 687                       const char *buf, size_t len)
 688 {
 689         struct rps_map *old_map, *map;
 690         cpumask_var_t mask;
 691         int err, cpu, i;
 692         static DEFINE_SPINLOCK(rps_map_lock);
 693
 694         if (!capable(CAP_NET_ADMIN))
 695                 return -EPERM;
 696
 697         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 698                 return -ENOMEM;
 699
 700         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 701         if (err) {
 702                 free_cpumask_var(mask);
 703                 return err;
 704         }
 705
 706         map = kzalloc(max_t(unsigned int,
 707             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 708             GFP_KERNEL);
 709         if (!map) {
 710                 free_cpumask_var(mask);
 711                 return -ENOMEM;
 712         }
 713
 714         i = 0;
 715         for_each_cpu_and(cpu, mask, cpu_online_mask)
 716                 map->cpus[i++] = cpu;
 717
 718         if (i)
 719                 map->len = i;
 720         else {
 721                 kfree(map);
 722                 map = NULL;
 723         }
 724
 725         spin_lock(&rps_map_lock);
 726         old_map = rcu_dereference_protected(queue->rps_map,
 727                                             lockdep_is_held(&rps_map_lock));
 728         rcu_assign_pointer(queue->rps_map, map);
 729         spin_unlock(&rps_map_lock);
 730
 731         if (map)
 732                 static_key_slow_inc(&rps_needed);
 733         if (old_map) {
 734                 kfree_rcu(old_map, rcu);
 735                 static_key_slow_dec(&rps_needed);
 736         }
 737         free_cpumask_var(mask);
 738         return len;
 739 }
 740
 741 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 742                                            struct rx_queue_attribute *attr,
 743                                            char *buf)
 744 {
 745         struct rps_dev_flow_table *flow_table;
 746         unsigned long val = 0;
 747
 748         rcu_read_lock();
 749         flow_table = rcu_dereference(queue->rps_flow_table);
 750         if (flow_table)
 751                 val = (unsigned long)flow_table->mask + 1;
 752         rcu_read_unlock();
 753
 754         return sprintf(buf, "%lu\n", val);
 755 }
 756
 757 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 758 {
 759         struct rps_dev_flow_table *table = container_of(rcu,
 760             struct rps_dev_flow_table, rcu);
 761         vfree(table);
 762 }
 763
 764 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 765                                      struct rx_queue_attribute *attr,
 766                                      const char *buf, size_t len)
 767 {
 768         unsigned long mask, count;
 769         struct rps_dev_flow_table *table, *old_table;
 770         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 771         int rc;
 772
 773         if (!capable(CAP_NET_ADMIN))
 774                 return -EPERM;
 775
 776         rc = kstrtoul(buf, 0, &count);
 777         if (rc < 0)
 778                 return rc;
 779
 780         if (count) {
 781                 mask = count - 1;
 782                 /* mask = roundup_pow_of_two(count) - 1;
 783                  * without overflows...
 784                  */
 785                 while ((mask | (mask >> 1)) != mask)
 786                         mask |= (mask >> 1);
 787                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 788                  * and on 32bit arches, must check
 789                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 790                  */
 791 #if BITS_PER_LONG > 32
 792                 if (mask > (unsigned long)(u32)mask)
 793                         return -EINVAL;
 794 #else
 795                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 796                                 / sizeof(struct rps_dev_flow)) {
 797                         /* Enforce a limit to prevent overflow */
 798                         return -EINVAL;
 799                 }
 800 #endif
 801                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 802                 if (!table)
 803                         return -ENOMEM;
 804
 805                 table->mask = mask;
 806                 for (count = 0; count <= mask; count++)
 807                         table->flows[count].cpu = RPS_NO_CPU;
 808         } else
 809                 table = NULL;
 810
 811         spin_lock(&rps_dev_flow_lock);
 812         old_table = rcu_dereference_protected(queue->rps_flow_table,
 813                                               lockdep_is_held(&rps_dev_flow_lock));
 814         rcu_assign_pointer(queue->rps_flow_table, table);
 815         spin_unlock(&rps_dev_flow_lock);
 816
 817         if (old_table)
 818                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 819
 820         return len;
 821 }
 822
 823 static struct rx_queue_attribute rps_cpus_attribute =
 824         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 825
 826
 827 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 828         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 829             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 830 #endif /* CONFIG_RPS */
 831
 832 static struct attribute *rx_queue_default_attrs[] = {
 833 #ifdef CONFIG_RPS
 834         &rps_cpus_attribute.attr,
 835         &rps_dev_flow_table_cnt_attribute.attr,
 836 #endif
 837         NULL
 838 };
 839
 840 static void rx_queue_release(struct kobject *kobj)
 841 {
 842         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 843 #ifdef CONFIG_RPS
 844         struct rps_map *map;
 845         struct rps_dev_flow_table *flow_table;
 846
 847
 848         map = rcu_dereference_protected(queue->rps_map, 1);
 849         if (map) {
 850                 RCU_INIT_POINTER(queue->rps_map, NULL);
 851                 kfree_rcu(map, rcu);
 852         }
 853
 854         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 855         if (flow_table) {
 856                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 857                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 858         }
 859 #endif
 860
 861         memset(kobj, 0, sizeof(*kobj));
 862         dev_put(queue->dev);
 863 }
 864
 865 static const void *rx_queue_namespace(struct kobject *kobj)
 866 {
 867         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 868         struct device *dev = &queue->dev->dev;
 869         const void *ns = NULL;
 870
 871         if (dev->class && dev->class->ns_type)
 872                 ns = dev->class->namespace(dev);
 873
 874         return ns;
 875 }
 876
 877 static struct kobj_type rx_queue_ktype = {
 878         .sysfs_ops = &rx_queue_sysfs_ops,
 879         .release = rx_queue_release,
 880         .default_attrs = rx_queue_default_attrs,
 881         .namespace = rx_queue_namespace
 882 };
 883
 884 static int rx_queue_add_kobject(struct net_device *dev, int index)
 885 {
 886         struct netdev_rx_queue *queue = dev->_rx + index;
 887         struct kobject *kobj = &queue->kobj;
 888         int error = 0;
 889
 890         kobj->kset = dev->queues_kset;
 891         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 892             "rx-%u", index);
 893         if (error)
 894                 goto exit;
 895
 896         if (dev->sysfs_rx_queue_group) {
 897                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
 898                 if (error)
 899                         goto exit;
 900         }
 901
 902         kobject_uevent(kobj, KOBJ_ADD);
 903         dev_hold(queue->dev);
 904
 905         return error;
 906 exit:
 907         kobject_put(kobj);
 908         return error;
 909 }
 910 #endif /* CONFIG_SYSFS */
 911
 912 int
 913 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
 914 {
 915 #ifdef CONFIG_SYSFS
 916         int i;
 917         int error = 0;
 918
 919 #ifndef CONFIG_RPS
 920         if (!dev->sysfs_rx_queue_group)
 921                 return 0;
 922 #endif
 923         for (i = old_num; i < new_num; i++) {
 924                 error = rx_queue_add_kobject(dev, i);
 925                 if (error) {
 926                         new_num = old_num;
 927                         break;
 928                 }
 929         }
 930
 931         while (--i >= new_num) {
 932                 if (dev->sysfs_rx_queue_group)
 933                         sysfs_remove_group(&dev->_rx[i].kobj,
 934                                            dev->sysfs_rx_queue_group);
 935                 kobject_put(&dev->_rx[i].kobj);
 936         }
 937
 938         return error;
 939 #else
 940         return 0;
 941 #endif
 942 }
 943
 944 #ifdef CONFIG_SYSFS
 945 /*
 946  * netdev_queue sysfs structures and functions.
 947  */
 948 struct netdev_queue_attribute {
 949         struct attribute attr;
 950         ssize_t (*show)(struct netdev_queue *queue,
 951             struct netdev_queue_attribute *attr, char *buf);
 952         ssize_t (*store)(struct netdev_queue *queue,
 953             struct netdev_queue_attribute *attr, const char *buf, size_t len);
 954 };
 955 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
 956     struct netdev_queue_attribute, attr)
 957
 958 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 959
 960 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 961                                       struct attribute *attr, char *buf)
 962 {
 963         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 964         struct netdev_queue *queue = to_netdev_queue(kobj);
 965
 966         if (!attribute->show)
 967                 return -EIO;
 968
 969         return attribute->show(queue, attribute, buf);
 970 }
 971
 972 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 973                                        struct attribute *attr,
 974                                        const char *buf, size_t count)
 975 {
 976         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 977         struct netdev_queue *queue = to_netdev_queue(kobj);
 978
 979         if (!attribute->store)
 980                 return -EIO;
 981
 982         return attribute->store(queue, attribute, buf, count);
 983 }
 984
 985 static const struct sysfs_ops netdev_queue_sysfs_ops = {
 986         .show = netdev_queue_attr_show,
 987         .store = netdev_queue_attr_store,
 988 };
 989
 990 static ssize_t show_trans_timeout(struct netdev_queue *queue,
 991                                   struct netdev_queue_attribute *attribute,
 992                                   char *buf)
 993 {
 994         unsigned long trans_timeout;
 995
 996         spin_lock_irq(&queue->_xmit_lock);
 997         trans_timeout = queue->trans_timeout;
 998         spin_unlock_irq(&queue->_xmit_lock);
 999
1000         return sprintf(buf, "%lu", trans_timeout);
1001 }
1002
1003 #ifdef CONFIG_XPS
1004 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1005 {
1006         struct net_device *dev = queue->dev;
1007         int i;
1008
1009         for (i = 0; i < dev->num_tx_queues; i++)
1010                 if (queue == &dev->_tx[i])
1011                         break;
1012
1013         BUG_ON(i >= dev->num_tx_queues);
1014
1015         return i;
1016 }
1017
1018 static ssize_t show_tx_maxrate(struct netdev_queue *queue,
1019                                struct netdev_queue_attribute *attribute,
1020                                char *buf)
1021 {
1022         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1023 }
1024
1025 static ssize_t set_tx_maxrate(struct netdev_queue *queue,
1026                               struct netdev_queue_attribute *attribute,
1027                               const char *buf, size_t len)
1028 {
1029         struct net_device *dev = queue->dev;
1030         int err, index = get_netdev_queue_index(queue);
1031         u32 rate = 0;
1032
1033         err = kstrtou32(buf, 10, &rate);
1034         if (err < 0)
1035                 return err;
1036
1037         if (!rtnl_trylock())
1038                 return restart_syscall();
1039
1040         err = -EOPNOTSUPP;
1041         if (dev->netdev_ops->ndo_set_tx_maxrate)
1042                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1043
1044         rtnl_unlock();
1045         if (!err) {
1046                 queue->tx_maxrate = rate;
1047                 return len;
1048         }
1049         return err;
1050 }
1051
1052 static struct netdev_queue_attribute queue_tx_maxrate =
1053         __ATTR(tx_maxrate, S_IRUGO | S_IWUSR,
1054                show_tx_maxrate, set_tx_maxrate);
1055 #endif
1056
1057 static struct netdev_queue_attribute queue_trans_timeout =
1058         __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
1059
1060 #ifdef CONFIG_BQL
1061 /*
1062  * Byte queue limits sysfs structures and functions.
1063  */
1064 static ssize_t bql_show(char *buf, unsigned int value)
1065 {
1066         return sprintf(buf, "%u\n", value);
1067 }
1068
1069 static ssize_t bql_set(const char *buf, const size_t count,
1070                        unsigned int *pvalue)
1071 {
1072         unsigned int value;
1073         int err;
1074
1075         if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
1076                 value = DQL_MAX_LIMIT;
1077         else {
1078                 err = kstrtouint(buf, 10, &value);
1079                 if (err < 0)
1080                         return err;
1081                 if (value > DQL_MAX_LIMIT)
1082                         return -EINVAL;
1083         }
1084
1085         *pvalue = value;
1086
1087         return count;
1088 }
1089
1090 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1091                                   struct netdev_queue_attribute *attr,
1092                                   char *buf)
1093 {
1094         struct dql *dql = &queue->dql;
1095
1096         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1097 }
1098
1099 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1100                                  struct netdev_queue_attribute *attribute,
1101                                  const char *buf, size_t len)
1102 {
1103         struct dql *dql = &queue->dql;
1104         unsigned int value;
1105         int err;
1106
1107         err = kstrtouint(buf, 10, &value);
1108         if (err < 0)
1109                 return err;
1110
1111         dql->slack_hold_time = msecs_to_jiffies(value);
1112
1113         return len;
1114 }
1115
1116 static struct netdev_queue_attribute bql_hold_time_attribute =
1117         __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
1118             bql_set_hold_time);
1119
1120 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1121                                  struct netdev_queue_attribute *attr,
1122                                  char *buf)
1123 {
1124         struct dql *dql = &queue->dql;
1125
1126         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1127 }
1128
1129 static struct netdev_queue_attribute bql_inflight_attribute =
1130         __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1131
1132 #define BQL_ATTR(NAME, FIELD)                                           \
1133 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1134                                  struct netdev_queue_attribute *attr,   \
1135                                  char *buf)                             \
1136 {                                                                       \
1137         return bql_show(buf, queue->dql.FIELD);                         \
1138 }                                                                       \
1139                                                                         \
1140 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1141                                 struct netdev_queue_attribute *attr,    \
1142                                 const char *buf, size_t len)            \
1143 {                                                                       \
1144         return bql_set(buf, len, &queue->dql.FIELD);                    \
1145 }                                                                       \
1146                                                                         \
1147 static struct netdev_queue_attribute bql_ ## NAME ## _attribute =       \
1148         __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME,              \
1149             bql_set_ ## NAME);
1150
1151 BQL_ATTR(limit, limit)
1152 BQL_ATTR(limit_max, max_limit)
1153 BQL_ATTR(limit_min, min_limit)
1154
1155 static struct attribute *dql_attrs[] = {
1156         &bql_limit_attribute.attr,
1157         &bql_limit_max_attribute.attr,
1158         &bql_limit_min_attribute.attr,
1159         &bql_hold_time_attribute.attr,
1160         &bql_inflight_attribute.attr,
1161         NULL
1162 };
1163
1164 static struct attribute_group dql_group = {
1165         .name  = "byte_queue_limits",
1166         .attrs  = dql_attrs,
1167 };
1168 #endif /* CONFIG_BQL */
1169
1170 #ifdef CONFIG_XPS
1171 static ssize_t show_xps_map(struct netdev_queue *queue,
1172                             struct netdev_queue_attribute *attribute, char *buf)
1173 {
1174         struct net_device *dev = queue->dev;
1175         struct xps_dev_maps *dev_maps;
1176         cpumask_var_t mask;
1177         unsigned long index;
1178         int i, len;
1179
1180         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1181                 return -ENOMEM;
1182
1183         index = get_netdev_queue_index(queue);
1184
1185         rcu_read_lock();
1186         dev_maps = rcu_dereference(dev->xps_maps);
1187         if (dev_maps) {
1188                 for_each_possible_cpu(i) {
1189                         struct xps_map *map =
1190                             rcu_dereference(dev_maps->cpu_map[i]);
1191                         if (map) {
1192                                 int j;
1193                                 for (j = 0; j < map->len; j++) {
1194                                         if (map->queues[j] == index) {
1195                                                 cpumask_set_cpu(i, mask);
1196                                                 break;
1197                                         }
1198                                 }
1199                         }
1200                 }
1201         }
1202         rcu_read_unlock();
1203
1204         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1205         free_cpumask_var(mask);
1206         return len < PAGE_SIZE ? len : -EINVAL;
1207 }
1208
1209 static ssize_t store_xps_map(struct netdev_queue *queue,
1210                       struct netdev_queue_attribute *attribute,
1211                       const char *buf, size_t len)
1212 {
1213         struct net_device *dev = queue->dev;
1214         unsigned long index;
1215         cpumask_var_t mask;
1216         int err;
1217
1218         if (!capable(CAP_NET_ADMIN))
1219                 return -EPERM;
1220
1221         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1222                 return -ENOMEM;
1223
1224         index = get_netdev_queue_index(queue);
1225
1226         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1227         if (err) {
1228                 free_cpumask_var(mask);
1229                 return err;
1230         }
1231
1232         err = netif_set_xps_queue(dev, mask, index);
1233
1234         free_cpumask_var(mask);
1235
1236         return err ? : len;
1237 }
1238
1239 static struct netdev_queue_attribute xps_cpus_attribute =
1240     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1241 #endif /* CONFIG_XPS */
1242
1243 static struct attribute *netdev_queue_default_attrs[] = {
1244         &queue_trans_timeout.attr,
1245 #ifdef CONFIG_XPS
1246         &xps_cpus_attribute.attr,
1247         &queue_tx_maxrate.attr,
1248 #endif
1249         NULL
1250 };
1251
1252 static void netdev_queue_release(struct kobject *kobj)
1253 {
1254         struct netdev_queue *queue = to_netdev_queue(kobj);
1255
1256         memset(kobj, 0, sizeof(*kobj));
1257         dev_put(queue->dev);
1258 }
1259
1260 static const void *netdev_queue_namespace(struct kobject *kobj)
1261 {
1262         struct netdev_queue *queue = to_netdev_queue(kobj);
1263         struct device *dev = &queue->dev->dev;
1264         const void *ns = NULL;
1265
1266         if (dev->class && dev->class->ns_type)
1267                 ns = dev->class->namespace(dev);
1268
1269         return ns;
1270 }
1271
1272 static struct kobj_type netdev_queue_ktype = {
1273         .sysfs_ops = &netdev_queue_sysfs_ops,
1274         .release = netdev_queue_release,
1275         .default_attrs = netdev_queue_default_attrs,
1276         .namespace = netdev_queue_namespace,
1277 };
1278
1279 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1280 {
1281         struct netdev_queue *queue = dev->_tx + index;
1282         struct kobject *kobj = &queue->kobj;
1283         int error = 0;
1284
1285         kobj->kset = dev->queues_kset;
1286         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1287             "tx-%u", index);
1288         if (error)
1289                 goto exit;
1290
1291 #ifdef CONFIG_BQL
1292         error = sysfs_create_group(kobj, &dql_group);
1293         if (error)
1294                 goto exit;
1295 #endif
1296
1297         kobject_uevent(kobj, KOBJ_ADD);
1298         dev_hold(queue->dev);
1299
1300         return 0;
1301 exit:
1302         kobject_put(kobj);
1303         return error;
1304 }
1305 #endif /* CONFIG_SYSFS */
1306
1307 int
1308 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1309 {
1310 #ifdef CONFIG_SYSFS
1311         int i;
1312         int error = 0;
1313
1314         for (i = old_num; i < new_num; i++) {
1315                 error = netdev_queue_add_kobject(dev, i);
1316                 if (error) {
1317                         new_num = old_num;
1318                         break;
1319                 }
1320         }
1321
1322         while (--i >= new_num) {
1323                 struct netdev_queue *queue = dev->_tx + i;
1324
1325 #ifdef CONFIG_BQL
1326                 sysfs_remove_group(&queue->kobj, &dql_group);
1327 #endif
1328                 kobject_put(&queue->kobj);
1329         }
1330
1331         return error;
1332 #else
1333         return 0;
1334 #endif /* CONFIG_SYSFS */
1335 }
1336
1337 static int register_queue_kobjects(struct net_device *dev)
1338 {
1339         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1340
1341 #ifdef CONFIG_SYSFS
1342         dev->queues_kset = kset_create_and_add("queues",
1343             NULL, &dev->dev.kobj);
1344         if (!dev->queues_kset)
1345                 return -ENOMEM;
1346         real_rx = dev->real_num_rx_queues;
1347 #endif
1348         real_tx = dev->real_num_tx_queues;
1349
1350         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1351         if (error)
1352                 goto error;
1353         rxq = real_rx;
1354
1355         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1356         if (error)
1357                 goto error;
1358         txq = real_tx;
1359
1360         return 0;
1361
1362 error:
1363         netdev_queue_update_kobjects(dev, txq, 0);
1364         net_rx_queue_update_kobjects(dev, rxq, 0);
1365         return error;
1366 }
1367
1368 static void remove_queue_kobjects(struct net_device *dev)
1369 {
1370         int real_rx = 0, real_tx = 0;
1371
1372 #ifdef CONFIG_SYSFS
1373         real_rx = dev->real_num_rx_queues;
1374 #endif
1375         real_tx = dev->real_num_tx_queues;
1376
1377         net_rx_queue_update_kobjects(dev, real_rx, 0);
1378         netdev_queue_update_kobjects(dev, real_tx, 0);
1379 #ifdef CONFIG_SYSFS
1380         kset_unregister(dev->queues_kset);
1381 #endif
1382 }
1383
1384 static bool net_current_may_mount(void)
1385 {
1386         struct net *net = current->nsproxy->net_ns;
1387
1388         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1389 }
1390
1391 static void *net_grab_current_ns(void)
1392 {
1393         struct net *ns = current->nsproxy->net_ns;
1394 #ifdef CONFIG_NET_NS
1395         if (ns)
1396                 atomic_inc(&ns->passive);
1397 #endif
1398         return ns;
1399 }
1400
1401 static const void *net_initial_ns(void)
1402 {
1403         return &init_net;
1404 }
1405
1406 static const void *net_netlink_ns(struct sock *sk)
1407 {
1408         return sock_net(sk);
1409 }
1410
1411 struct kobj_ns_type_operations net_ns_type_operations = {
1412         .type = KOBJ_NS_TYPE_NET,
1413         .current_may_mount = net_current_may_mount,
1414         .grab_current_ns = net_grab_current_ns,
1415         .netlink_ns = net_netlink_ns,
1416         .initial_ns = net_initial_ns,
1417         .drop_ns = net_drop_ns,
1418 };
1419 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1420
1421 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1422 {
1423         struct net_device *dev = to_net_dev(d);
1424         int retval;
1425
1426         /* pass interface to uevent. */
1427         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1428         if (retval)
1429                 goto exit;
1430
1431         /* pass ifindex to uevent.
1432          * ifindex is useful as it won't change (interface name may change)
1433          * and is what RtNetlink uses natively. */
1434         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1435
1436 exit:
1437         return retval;
1438 }
1439
1440 /*
1441  *      netdev_release -- destroy and free a dead device.
1442  *      Called when last reference to device kobject is gone.
1443  */
1444 static void netdev_release(struct device *d)
1445 {
1446         struct net_device *dev = to_net_dev(d);
1447
1448         BUG_ON(dev->reg_state != NETREG_RELEASED);
1449
1450         kfree(dev->ifalias);
1451         netdev_freemem(dev);
1452 }
1453
1454 static const void *net_namespace(struct device *d)
1455 {
1456         struct net_device *dev;
1457         dev = container_of(d, struct net_device, dev);
1458         return dev_net(dev);
1459 }
1460
1461 static struct class net_class = {
1462         .name = "net",
1463         .dev_release = netdev_release,
1464         .dev_groups = net_class_groups,
1465         .dev_uevent = netdev_uevent,
1466         .ns_type = &net_ns_type_operations,
1467         .namespace = net_namespace,
1468 };
1469
1470 #ifdef CONFIG_OF_NET
1471 static int of_dev_node_match(struct device *dev, const void *data)
1472 {
1473         int ret = 0;
1474
1475         if (dev->parent)
1476                 ret = dev->parent->of_node == data;
1477
1478         return ret == 0 ? dev->of_node == data : ret;
1479 }
1480
1481 struct net_device *of_find_net_device_by_node(struct device_node *np)
1482 {
1483         struct device *dev;
1484
1485         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1486         if (!dev)
1487                 return NULL;
1488
1489         return to_net_dev(dev);
1490 }
1491 EXPORT_SYMBOL(of_find_net_device_by_node);
1492 #endif
1493
1494 /* Delete sysfs entries but hold kobject reference until after all
1495  * netdev references are gone.
1496  */
1497 void netdev_unregister_kobject(struct net_device *ndev)
1498 {
1499         struct device *dev = &(ndev->dev);
1500
1501         kobject_get(&dev->kobj);
1502
1503         remove_queue_kobjects(ndev);
1504
1505         pm_runtime_set_memalloc_noio(dev, false);
1506
1507         device_del(dev);
1508 }
1509
1510 /* Create sysfs entries for network device. */
1511 int netdev_register_kobject(struct net_device *ndev)
1512 {
1513         struct device *dev = &(ndev->dev);
1514         const struct attribute_group **groups = ndev->sysfs_groups;
1515         int error = 0;
1516
1517         device_initialize(dev);
1518         dev->class = &net_class;
1519         dev->platform_data = ndev;
1520         dev->groups = groups;
1521
1522         dev_set_name(dev, "%s", ndev->name);
1523
1524 #ifdef CONFIG_SYSFS
1525         /* Allow for a device specific group */
1526         if (*groups)
1527                 groups++;
1528
1529         *groups++ = &netstat_group;
1530
1531 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1532         if (ndev->ieee80211_ptr)
1533                 *groups++ = &wireless_group;
1534 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1535         else if (ndev->wireless_handlers)
1536                 *groups++ = &wireless_group;
1537 #endif
1538 #endif
1539 #endif /* CONFIG_SYSFS */
1540
1541         error = device_add(dev);
1542         if (error)
1543                 return error;
1544
1545         error = register_queue_kobjects(ndev);
1546         if (error) {
1547                 device_del(dev);
1548                 return error;
1549         }
1550
1551         pm_runtime_set_memalloc_noio(dev, true);
1552
1553         return error;
1554 }
1555
1556 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1557                                 const void *ns)
1558 {
1559         return class_create_file_ns(&net_class, class_attr, ns);
1560 }
1561 EXPORT_SYMBOL(netdev_class_create_file_ns);
1562
1563 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1564                                  const void *ns)
1565 {
1566         class_remove_file_ns(&net_class, class_attr, ns);
1567 }
1568 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1569
1570 int __init netdev_kobject_init(void)
1571 {
1572         kobj_ns_type_register(&net_ns_type_operations);
1573         return class_register(&net_class);
1574 }