net/core/net-sysfs.c

   1 /*
   2  * net-sysfs.c - network device class and attributes
   3  *
   4  * Copyright (c) 2003 Stephen Hemminger <[email protected]>
   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_dec[] = "%d\n";
  33 static const char fmt_ulong[] = "%lu\n";
  34 static const char fmt_u64[] = "%llu\n";
  35
  36 static inline int dev_isalive(const struct net_device *dev)
  37 {
  38         return dev->reg_state <= NETREG_REGISTERED;
  39 }
  40
  41 /* use same locking rules as GIF* ioctl's */
  42 static ssize_t netdev_show(const struct device *dev,
  43                            struct device_attribute *attr, char *buf,
  44                            ssize_t (*format)(const struct net_device *, char *))
  45 {
  46         struct net_device *ndev = to_net_dev(dev);
  47         ssize_t ret = -EINVAL;
  48
  49         read_lock(&dev_base_lock);
  50         if (dev_isalive(ndev))
  51                 ret = (*format)(ndev, buf);
  52         read_unlock(&dev_base_lock);
  53
  54         return ret;
  55 }
  56
  57 /* generate a show function for simple field */
  58 #define NETDEVICE_SHOW(field, format_string)                            \
  59 static ssize_t format_##field(const struct net_device *dev, char *buf)  \
  60 {                                                                       \
  61         return sprintf(buf, format_string, dev->field);                 \
  62 }                                                                       \
  63 static ssize_t field##_show(struct device *dev,                         \
  64                             struct device_attribute *attr, char *buf)   \
  65 {                                                                       \
  66         return netdev_show(dev, attr, buf, format_##field);             \
  67 }                                                                       \
  68
  69 #define NETDEVICE_SHOW_RO(field, format_string)                         \
  70 NETDEVICE_SHOW(field, format_string);                                   \
  71 static DEVICE_ATTR_RO(field)
  72
  73 #define NETDEVICE_SHOW_RW(field, format_string)                         \
  74 NETDEVICE_SHOW(field, format_string);                                   \
  75 static DEVICE_ATTR_RW(field)
  76
  77 /* use same locking and permission rules as SIF* ioctl's */
  78 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  79                             const char *buf, size_t len,
  80                             int (*set)(struct net_device *, unsigned long))
  81 {
  82         struct net_device *netdev = to_net_dev(dev);
  83         struct net *net = dev_net(netdev);
  84         unsigned long new;
  85         int ret = -EINVAL;
  86
  87         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  88                 return -EPERM;
  89
  90         ret = kstrtoul(buf, 0, &new);
  91         if (ret)
  92                 goto err;
  93
  94         if (!rtnl_trylock())
  95                 return restart_syscall();
  96
  97         if (dev_isalive(netdev)) {
  98                 if ((ret = (*set)(netdev, new)) == 0)
  99                         ret = len;
 100         }
 101         rtnl_unlock();
 102  err:
 103         return ret;
 104 }
 105
 106 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 107 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 108 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 109 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 110 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 111 NETDEVICE_SHOW_RO(type, fmt_dec);
 112 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 113
 114 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
 115                            char *buf)
 116 {
 117         struct net_device *ndev = to_net_dev(dev);
 118
 119         return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
 120 }
 121 static DEVICE_ATTR_RO(iflink);
 122
 123 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 124 {
 125         return sprintf(buf, fmt_dec, dev->name_assign_type);
 126 }
 127
 128 static ssize_t name_assign_type_show(struct device *dev,
 129                                      struct device_attribute *attr,
 130                                      char *buf)
 131 {
 132         struct net_device *ndev = to_net_dev(dev);
 133         ssize_t ret = -EINVAL;
 134
 135         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
 136                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
 137
 138         return ret;
 139 }
 140 static DEVICE_ATTR_RO(name_assign_type);
 141
 142 /* use same locking rules as GIFHWADDR ioctl's */
 143 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 144                             char *buf)
 145 {
 146         struct net_device *ndev = to_net_dev(dev);
 147         ssize_t ret = -EINVAL;
 148
 149         read_lock(&dev_base_lock);
 150         if (dev_isalive(ndev))
 151                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 152         read_unlock(&dev_base_lock);
 153         return ret;
 154 }
 155 static DEVICE_ATTR_RO(address);
 156
 157 static ssize_t broadcast_show(struct device *dev,
 158                               struct device_attribute *attr, char *buf)
 159 {
 160         struct net_device *ndev = to_net_dev(dev);
 161         if (dev_isalive(ndev))
 162                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
 163         return -EINVAL;
 164 }
 165 static DEVICE_ATTR_RO(broadcast);
 166
 167 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
 168 {
 169         if (!netif_running(dev))
 170                 return -EINVAL;
 171         return dev_change_carrier(dev, (bool) new_carrier);
 172 }
 173
 174 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 175                              const char *buf, size_t len)
 176 {
 177         return netdev_store(dev, attr, buf, len, change_carrier);
 178 }
 179
 180 static ssize_t carrier_show(struct device *dev,
 181                             struct device_attribute *attr, char *buf)
 182 {
 183         struct net_device *netdev = to_net_dev(dev);
 184         if (netif_running(netdev)) {
 185                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 186         }
 187         return -EINVAL;
 188 }
 189 static DEVICE_ATTR_RW(carrier);
 190
 191 static ssize_t speed_show(struct device *dev,
 192                           struct device_attribute *attr, char *buf)
 193 {
 194         struct net_device *netdev = to_net_dev(dev);
 195         int ret = -EINVAL;
 196
 197         if (!rtnl_trylock())
 198                 return restart_syscall();
 199
 200         if (netif_running(netdev)) {
 201                 struct ethtool_link_ksettings cmd;
 202
 203                 if (!__ethtool_get_link_ksettings(netdev, &cmd))
 204                         ret = sprintf(buf, fmt_dec, cmd.base.speed);
 205         }
 206         rtnl_unlock();
 207         return ret;
 208 }
 209 static DEVICE_ATTR_RO(speed);
 210
 211 static ssize_t duplex_show(struct device *dev,
 212                            struct device_attribute *attr, char *buf)
 213 {
 214         struct net_device *netdev = to_net_dev(dev);
 215         int ret = -EINVAL;
 216
 217         if (!rtnl_trylock())
 218                 return restart_syscall();
 219
 220         if (netif_running(netdev)) {
 221                 struct ethtool_link_ksettings cmd;
 222
 223                 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
 224                         const char *duplex;
 225
 226                         switch (cmd.base.duplex) {
 227                         case DUPLEX_HALF:
 228                                 duplex = "half";
 229                                 break;
 230                         case DUPLEX_FULL:
 231                                 duplex = "full";
 232                                 break;
 233                         default:
 234                                 duplex = "unknown";
 235                                 break;
 236                         }
 237                         ret = sprintf(buf, "%s\n", duplex);
 238                 }
 239         }
 240         rtnl_unlock();
 241         return ret;
 242 }
 243 static DEVICE_ATTR_RO(duplex);
 244
 245 static ssize_t dormant_show(struct device *dev,
 246                             struct device_attribute *attr, char *buf)
 247 {
 248         struct net_device *netdev = to_net_dev(dev);
 249
 250         if (netif_running(netdev))
 251                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 252
 253         return -EINVAL;
 254 }
 255 static DEVICE_ATTR_RO(dormant);
 256
 257 static const char *const operstates[] = {
 258         "unknown",
 259         "notpresent", /* currently unused */
 260         "down",
 261         "lowerlayerdown",
 262         "testing", /* currently unused */
 263         "dormant",
 264         "up"
 265 };
 266
 267 static ssize_t operstate_show(struct device *dev,
 268                               struct device_attribute *attr, char *buf)
 269 {
 270         const struct net_device *netdev = to_net_dev(dev);
 271         unsigned char operstate;
 272
 273         read_lock(&dev_base_lock);
 274         operstate = netdev->operstate;
 275         if (!netif_running(netdev))
 276                 operstate = IF_OPER_DOWN;
 277         read_unlock(&dev_base_lock);
 278
 279         if (operstate >= ARRAY_SIZE(operstates))
 280                 return -EINVAL; /* should not happen */
 281
 282         return sprintf(buf, "%s\n", operstates[operstate]);
 283 }
 284 static DEVICE_ATTR_RO(operstate);
 285
 286 static ssize_t carrier_changes_show(struct device *dev,
 287                                     struct device_attribute *attr,
 288                                     char *buf)
 289 {
 290         struct net_device *netdev = to_net_dev(dev);
 291         return sprintf(buf, fmt_dec,
 292                        atomic_read(&netdev->carrier_changes));
 293 }
 294 static DEVICE_ATTR_RO(carrier_changes);
 295
 296 /* read-write attributes */
 297
 298 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 299 {
 300         return dev_set_mtu(dev, (int) new_mtu);
 301 }
 302
 303 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 304                          const char *buf, size_t len)
 305 {
 306         return netdev_store(dev, attr, buf, len, change_mtu);
 307 }
 308 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 309
 310 static int change_flags(struct net_device *dev, unsigned long new_flags)
 311 {
 312         return dev_change_flags(dev, (unsigned int) new_flags);
 313 }
 314
 315 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 316                            const char *buf, size_t len)
 317 {
 318         return netdev_store(dev, attr, buf, len, change_flags);
 319 }
 320 NETDEVICE_SHOW_RW(flags, fmt_hex);
 321
 322 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
 323 {
 324         dev->tx_queue_len = new_len;
 325         return 0;
 326 }
 327
 328 static ssize_t tx_queue_len_store(struct device *dev,
 329                                   struct device_attribute *attr,
 330                                   const char *buf, size_t len)
 331 {
 332         if (!capable(CAP_NET_ADMIN))
 333                 return -EPERM;
 334
 335         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
 336 }
 337 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
 338
 339 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 340 {
 341         dev->gro_flush_timeout = val;
 342         return 0;
 343 }
 344
 345 static ssize_t gro_flush_timeout_store(struct device *dev,
 346                                   struct device_attribute *attr,
 347                                   const char *buf, size_t len)
 348 {
 349         if (!capable(CAP_NET_ADMIN))
 350                 return -EPERM;
 351
 352         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 353 }
 354 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 355
 356 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 357                              const char *buf, size_t len)
 358 {
 359         struct net_device *netdev = to_net_dev(dev);
 360         struct net *net = dev_net(netdev);
 361         size_t count = len;
 362         ssize_t ret;
 363
 364         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 365                 return -EPERM;
 366
 367         /* ignore trailing newline */
 368         if (len >  0 && buf[len - 1] == '\n')
 369                 --count;
 370
 371         if (!rtnl_trylock())
 372                 return restart_syscall();
 373         ret = dev_set_alias(netdev, buf, count);
 374         rtnl_unlock();
 375
 376         return ret < 0 ? ret : len;
 377 }
 378
 379 static ssize_t ifalias_show(struct device *dev,
 380                             struct device_attribute *attr, char *buf)
 381 {
 382         const struct net_device *netdev = to_net_dev(dev);
 383         ssize_t ret = 0;
 384
 385         if (!rtnl_trylock())
 386                 return restart_syscall();
 387         if (netdev->ifalias)
 388                 ret = sprintf(buf, "%s\n", netdev->ifalias);
 389         rtnl_unlock();
 390         return ret;
 391 }
 392 static DEVICE_ATTR_RW(ifalias);
 393
 394 static int change_group(struct net_device *dev, unsigned long new_group)
 395 {
 396         dev_set_group(dev, (int) new_group);
 397         return 0;
 398 }
 399
 400 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 401                            const char *buf, size_t len)
 402 {
 403         return netdev_store(dev, attr, buf, len, change_group);
 404 }
 405 NETDEVICE_SHOW(group, fmt_dec);
 406 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
 407
 408 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 409 {
 410         return dev_change_proto_down(dev, (bool) proto_down);
 411 }
 412
 413 static ssize_t proto_down_store(struct device *dev,
 414                                 struct device_attribute *attr,
 415                                 const char *buf, size_t len)
 416 {
 417         return netdev_store(dev, attr, buf, len, change_proto_down);
 418 }
 419 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 420
 421 static ssize_t phys_port_id_show(struct device *dev,
 422                                  struct device_attribute *attr, char *buf)
 423 {
 424         struct net_device *netdev = to_net_dev(dev);
 425         ssize_t ret = -EINVAL;
 426
 427         if (!rtnl_trylock())
 428                 return restart_syscall();
 429
 430         if (dev_isalive(netdev)) {
 431                 struct netdev_phys_item_id ppid;
 432
 433                 ret = dev_get_phys_port_id(netdev, &ppid);
 434                 if (!ret)
 435                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 436         }
 437         rtnl_unlock();
 438
 439         return ret;
 440 }
 441 static DEVICE_ATTR_RO(phys_port_id);
 442
 443 static ssize_t phys_port_name_show(struct device *dev,
 444                                    struct device_attribute *attr, char *buf)
 445 {
 446         struct net_device *netdev = to_net_dev(dev);
 447         ssize_t ret = -EINVAL;
 448
 449         if (!rtnl_trylock())
 450                 return restart_syscall();
 451
 452         if (dev_isalive(netdev)) {
 453                 char name[IFNAMSIZ];
 454
 455                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 456                 if (!ret)
 457                         ret = sprintf(buf, "%s\n", name);
 458         }
 459         rtnl_unlock();
 460
 461         return ret;
 462 }
 463 static DEVICE_ATTR_RO(phys_port_name);
 464
 465 static ssize_t phys_switch_id_show(struct device *dev,
 466                                    struct device_attribute *attr, char *buf)
 467 {
 468         struct net_device *netdev = to_net_dev(dev);
 469         ssize_t ret = -EINVAL;
 470
 471         if (!rtnl_trylock())
 472                 return restart_syscall();
 473
 474         if (dev_isalive(netdev)) {
 475                 struct switchdev_attr attr = {
 476                         .orig_dev = netdev,
 477                         .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
 478                         .flags = SWITCHDEV_F_NO_RECURSE,
 479                 };
 480
 481                 ret = switchdev_port_attr_get(netdev, &attr);
 482                 if (!ret)
 483                         ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
 484                                       attr.u.ppid.id);
 485         }
 486         rtnl_unlock();
 487
 488         return ret;
 489 }
 490 static DEVICE_ATTR_RO(phys_switch_id);
 491
 492 static struct attribute *net_class_attrs[] = {
 493         &dev_attr_netdev_group.attr,
 494         &dev_attr_type.attr,
 495         &dev_attr_dev_id.attr,
 496         &dev_attr_dev_port.attr,
 497         &dev_attr_iflink.attr,
 498         &dev_attr_ifindex.attr,
 499         &dev_attr_name_assign_type.attr,
 500         &dev_attr_addr_assign_type.attr,
 501         &dev_attr_addr_len.attr,
 502         &dev_attr_link_mode.attr,
 503         &dev_attr_address.attr,
 504         &dev_attr_broadcast.attr,
 505         &dev_attr_speed.attr,
 506         &dev_attr_duplex.attr,
 507         &dev_attr_dormant.attr,
 508         &dev_attr_operstate.attr,
 509         &dev_attr_carrier_changes.attr,
 510         &dev_attr_ifalias.attr,
 511         &dev_attr_carrier.attr,
 512         &dev_attr_mtu.attr,
 513         &dev_attr_flags.attr,
 514         &dev_attr_tx_queue_len.attr,
 515         &dev_attr_gro_flush_timeout.attr,
 516         &dev_attr_phys_port_id.attr,
 517         &dev_attr_phys_port_name.attr,
 518         &dev_attr_phys_switch_id.attr,
 519         &dev_attr_proto_down.attr,
 520         NULL,
 521 };
 522 ATTRIBUTE_GROUPS(net_class);
 523
 524 /* Show a given an attribute in the statistics group */
 525 static ssize_t netstat_show(const struct device *d,
 526                             struct device_attribute *attr, char *buf,
 527                             unsigned long offset)
 528 {
 529         struct net_device *dev = to_net_dev(d);
 530         ssize_t ret = -EINVAL;
 531
 532         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 533                         offset % sizeof(u64) != 0);
 534
 535         read_lock(&dev_base_lock);
 536         if (dev_isalive(dev)) {
 537                 struct rtnl_link_stats64 temp;
 538                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 539
 540                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
 541         }
 542         read_unlock(&dev_base_lock);
 543         return ret;
 544 }
 545
 546 /* generate a read-only statistics attribute */
 547 #define NETSTAT_ENTRY(name)                                             \
 548 static ssize_t name##_show(struct device *d,                            \
 549                            struct device_attribute *attr, char *buf)    \
 550 {                                                                       \
 551         return netstat_show(d, attr, buf,                               \
 552                             offsetof(struct rtnl_link_stats64, name));  \
 553 }                                                                       \
 554 static DEVICE_ATTR_RO(name)
 555
 556 NETSTAT_ENTRY(rx_packets);
 557 NETSTAT_ENTRY(tx_packets);
 558 NETSTAT_ENTRY(rx_bytes);
 559 NETSTAT_ENTRY(tx_bytes);
 560 NETSTAT_ENTRY(rx_errors);
 561 NETSTAT_ENTRY(tx_errors);
 562 NETSTAT_ENTRY(rx_dropped);
 563 NETSTAT_ENTRY(tx_dropped);
 564 NETSTAT_ENTRY(multicast);
 565 NETSTAT_ENTRY(collisions);
 566 NETSTAT_ENTRY(rx_length_errors);
 567 NETSTAT_ENTRY(rx_over_errors);
 568 NETSTAT_ENTRY(rx_crc_errors);
 569 NETSTAT_ENTRY(rx_frame_errors);
 570 NETSTAT_ENTRY(rx_fifo_errors);
 571 NETSTAT_ENTRY(rx_missed_errors);
 572 NETSTAT_ENTRY(tx_aborted_errors);
 573 NETSTAT_ENTRY(tx_carrier_errors);
 574 NETSTAT_ENTRY(tx_fifo_errors);
 575 NETSTAT_ENTRY(tx_heartbeat_errors);
 576 NETSTAT_ENTRY(tx_window_errors);
 577 NETSTAT_ENTRY(rx_compressed);
 578 NETSTAT_ENTRY(tx_compressed);
 579 NETSTAT_ENTRY(rx_nohandler);
 580
 581 static struct attribute *netstat_attrs[] = {
 582         &dev_attr_rx_packets.attr,
 583         &dev_attr_tx_packets.attr,
 584         &dev_attr_rx_bytes.attr,
 585         &dev_attr_tx_bytes.attr,
 586         &dev_attr_rx_errors.attr,
 587         &dev_attr_tx_errors.attr,
 588         &dev_attr_rx_dropped.attr,
 589         &dev_attr_tx_dropped.attr,
 590         &dev_attr_multicast.attr,
 591         &dev_attr_collisions.attr,
 592         &dev_attr_rx_length_errors.attr,
 593         &dev_attr_rx_over_errors.attr,
 594         &dev_attr_rx_crc_errors.attr,
 595         &dev_attr_rx_frame_errors.attr,
 596         &dev_attr_rx_fifo_errors.attr,
 597         &dev_attr_rx_missed_errors.attr,
 598         &dev_attr_tx_aborted_errors.attr,
 599         &dev_attr_tx_carrier_errors.attr,
 600         &dev_attr_tx_fifo_errors.attr,
 601         &dev_attr_tx_heartbeat_errors.attr,
 602         &dev_attr_tx_window_errors.attr,
 603         &dev_attr_rx_compressed.attr,
 604         &dev_attr_tx_compressed.attr,
 605         &dev_attr_rx_nohandler.attr,
 606         NULL
 607 };
 608
 609
 610 static struct attribute_group netstat_group = {
 611         .name  = "statistics",
 612         .attrs  = netstat_attrs,
 613 };
 614
 615 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 616 static struct attribute *wireless_attrs[] = {
 617         NULL
 618 };
 619
 620 static struct attribute_group wireless_group = {
 621         .name = "wireless",
 622         .attrs = wireless_attrs,
 623 };
 624 #endif
 625
 626 #else /* CONFIG_SYSFS */
 627 #define net_class_groups        NULL
 628 #endif /* CONFIG_SYSFS */
 629
 630 #ifdef CONFIG_SYSFS
 631 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 632     struct rx_queue_attribute, attr)
 633
 634 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 635
 636 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 637                                   char *buf)
 638 {
 639         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 640         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 641
 642         if (!attribute->show)
 643                 return -EIO;
 644
 645         return attribute->show(queue, attribute, buf);
 646 }
 647
 648 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 649                                    const char *buf, size_t count)
 650 {
 651         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 652         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 653
 654         if (!attribute->store)
 655                 return -EIO;
 656
 657         return attribute->store(queue, attribute, buf, count);
 658 }
 659
 660 static const struct sysfs_ops rx_queue_sysfs_ops = {
 661         .show = rx_queue_attr_show,
 662         .store = rx_queue_attr_store,
 663 };
 664
 665 #ifdef CONFIG_RPS
 666 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 667                             struct rx_queue_attribute *attribute, char *buf)
 668 {
 669         struct rps_map *map;
 670         cpumask_var_t mask;
 671         int i, len;
 672
 673         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 674                 return -ENOMEM;
 675
 676         rcu_read_lock();
 677         map = rcu_dereference(queue->rps_map);
 678         if (map)
 679                 for (i = 0; i < map->len; i++)
 680                         cpumask_set_cpu(map->cpus[i], mask);
 681
 682         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 683         rcu_read_unlock();
 684         free_cpumask_var(mask);
 685
 686         return len < PAGE_SIZE ? len : -EINVAL;
 687 }
 688
 689 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 690                       struct rx_queue_attribute *attribute,
 691                       const char *buf, size_t len)
 692 {
 693         struct rps_map *old_map, *map;
 694         cpumask_var_t mask;
 695         int err, cpu, i;
 696         static DEFINE_MUTEX(rps_map_mutex);
 697
 698         if (!capable(CAP_NET_ADMIN))
 699                 return -EPERM;
 700
 701         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 702                 return -ENOMEM;
 703
 704         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 705         if (err) {
 706                 free_cpumask_var(mask);
 707                 return err;
 708         }
 709
 710         map = kzalloc(max_t(unsigned int,
 711             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 712             GFP_KERNEL);
 713         if (!map) {
 714                 free_cpumask_var(mask);
 715                 return -ENOMEM;
 716         }
 717
 718         i = 0;
 719         for_each_cpu_and(cpu, mask, cpu_online_mask)
 720                 map->cpus[i++] = cpu;
 721
 722         if (i)
 723                 map->len = i;
 724         else {
 725                 kfree(map);
 726                 map = NULL;
 727         }
 728
 729         mutex_lock(&rps_map_mutex);
 730         old_map = rcu_dereference_protected(queue->rps_map,
 731                                             mutex_is_locked(&rps_map_mutex));
 732         rcu_assign_pointer(queue->rps_map, map);
 733
 734         if (map)
 735                 static_key_slow_inc(&rps_needed);
 736         if (old_map)
 737                 static_key_slow_dec(&rps_needed);
 738
 739         mutex_unlock(&rps_map_mutex);
 740
 741         if (old_map)
 742                 kfree_rcu(old_map, rcu);
 743
 744         free_cpumask_var(mask);
 745         return len;
 746 }
 747
 748 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 749                                            struct rx_queue_attribute *attr,
 750                                            char *buf)
 751 {
 752         struct rps_dev_flow_table *flow_table;
 753         unsigned long val = 0;
 754
 755         rcu_read_lock();
 756         flow_table = rcu_dereference(queue->rps_flow_table);
 757         if (flow_table)
 758                 val = (unsigned long)flow_table->mask + 1;
 759         rcu_read_unlock();
 760
 761         return sprintf(buf, "%lu\n", val);
 762 }
 763
 764 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 765 {
 766         struct rps_dev_flow_table *table = container_of(rcu,
 767             struct rps_dev_flow_table, rcu);
 768         vfree(table);
 769 }
 770
 771 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 772                                      struct rx_queue_attribute *attr,
 773                                      const char *buf, size_t len)
 774 {
 775         unsigned long mask, count;
 776         struct rps_dev_flow_table *table, *old_table;
 777         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 778         int rc;
 779
 780         if (!capable(CAP_NET_ADMIN))
 781                 return -EPERM;
 782
 783         rc = kstrtoul(buf, 0, &count);
 784         if (rc < 0)
 785                 return rc;
 786
 787         if (count) {
 788                 mask = count - 1;
 789                 /* mask = roundup_pow_of_two(count) - 1;
 790                  * without overflows...
 791                  */
 792                 while ((mask | (mask >> 1)) != mask)
 793                         mask |= (mask >> 1);
 794                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 795                  * and on 32bit arches, must check
 796                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 797                  */
 798 #if BITS_PER_LONG > 32
 799                 if (mask > (unsigned long)(u32)mask)
 800                         return -EINVAL;
 801 #else
 802                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 803                                 / sizeof(struct rps_dev_flow)) {
 804                         /* Enforce a limit to prevent overflow */
 805                         return -EINVAL;
 806                 }
 807 #endif
 808                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 809                 if (!table)
 810                         return -ENOMEM;
 811
 812                 table->mask = mask;
 813                 for (count = 0; count <= mask; count++)
 814                         table->flows[count].cpu = RPS_NO_CPU;
 815         } else
 816                 table = NULL;
 817
 818         spin_lock(&rps_dev_flow_lock);
 819         old_table = rcu_dereference_protected(queue->rps_flow_table,
 820                                               lockdep_is_held(&rps_dev_flow_lock));
 821         rcu_assign_pointer(queue->rps_flow_table, table);
 822         spin_unlock(&rps_dev_flow_lock);
 823
 824         if (old_table)
 825                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 826
 827         return len;
 828 }
 829
 830 static struct rx_queue_attribute rps_cpus_attribute =
 831         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 832
 833
 834 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 835         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 836             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 837 #endif /* CONFIG_RPS */
 838
 839 static struct attribute *rx_queue_default_attrs[] = {
 840 #ifdef CONFIG_RPS
 841         &rps_cpus_attribute.attr,
 842         &rps_dev_flow_table_cnt_attribute.attr,
 843 #endif
 844         NULL
 845 };
 846
 847 static void rx_queue_release(struct kobject *kobj)
 848 {
 849         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 850 #ifdef CONFIG_RPS
 851         struct rps_map *map;
 852         struct rps_dev_flow_table *flow_table;
 853
 854
 855         map = rcu_dereference_protected(queue->rps_map, 1);
 856         if (map) {
 857                 RCU_INIT_POINTER(queue->rps_map, NULL);
 858                 kfree_rcu(map, rcu);
 859         }
 860
 861         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 862         if (flow_table) {
 863                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 864                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 865         }
 866 #endif
 867
 868         memset(kobj, 0, sizeof(*kobj));
 869         dev_put(queue->dev);
 870 }
 871
 872 static const void *rx_queue_namespace(struct kobject *kobj)
 873 {
 874         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 875         struct device *dev = &queue->dev->dev;
 876         const void *ns = NULL;
 877
 878         if (dev->class && dev->class->ns_type)
 879                 ns = dev->class->namespace(dev);
 880
 881         return ns;
 882 }
 883
 884 static struct kobj_type rx_queue_ktype = {
 885         .sysfs_ops = &rx_queue_sysfs_ops,
 886         .release = rx_queue_release,
 887         .default_attrs = rx_queue_default_attrs,
 888         .namespace = rx_queue_namespace
 889 };
 890
 891 static int rx_queue_add_kobject(struct net_device *dev, int index)
 892 {
 893         struct netdev_rx_queue *queue = dev->_rx + index;
 894         struct kobject *kobj = &queue->kobj;
 895         int error = 0;
 896
 897         kobj->kset = dev->queues_kset;
 898         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 899             "rx-%u", index);
 900         if (error)
 901                 goto exit;
 902
 903         if (dev->sysfs_rx_queue_group) {
 904                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
 905                 if (error)
 906                         goto exit;
 907         }
 908
 909         kobject_uevent(kobj, KOBJ_ADD);
 910         dev_hold(queue->dev);
 911
 912         return error;
 913 exit:
 914         kobject_put(kobj);
 915         return error;
 916 }
 917 #endif /* CONFIG_SYSFS */
 918
 919 int
 920 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
 921 {
 922 #ifdef CONFIG_SYSFS
 923         int i;
 924         int error = 0;
 925
 926 #ifndef CONFIG_RPS
 927         if (!dev->sysfs_rx_queue_group)
 928                 return 0;
 929 #endif
 930         for (i = old_num; i < new_num; i++) {
 931                 error = rx_queue_add_kobject(dev, i);
 932                 if (error) {
 933                         new_num = old_num;
 934                         break;
 935                 }
 936         }
 937
 938         while (--i >= new_num) {
 939                 if (dev->sysfs_rx_queue_group)
 940                         sysfs_remove_group(&dev->_rx[i].kobj,
 941                                            dev->sysfs_rx_queue_group);
 942                 kobject_put(&dev->_rx[i].kobj);
 943         }
 944
 945         return error;
 946 #else
 947         return 0;
 948 #endif
 949 }
 950
 951 #ifdef CONFIG_SYSFS
 952 /*
 953  * netdev_queue sysfs structures and functions.
 954  */
 955 struct netdev_queue_attribute {
 956         struct attribute attr;
 957         ssize_t (*show)(struct netdev_queue *queue,
 958             struct netdev_queue_attribute *attr, char *buf);
 959         ssize_t (*store)(struct netdev_queue *queue,
 960             struct netdev_queue_attribute *attr, const char *buf, size_t len);
 961 };
 962 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
 963     struct netdev_queue_attribute, attr)
 964
 965 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 966
 967 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 968                                       struct attribute *attr, char *buf)
 969 {
 970         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 971         struct netdev_queue *queue = to_netdev_queue(kobj);
 972
 973         if (!attribute->show)
 974                 return -EIO;
 975
 976         return attribute->show(queue, attribute, buf);
 977 }
 978
 979 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 980                                        struct attribute *attr,
 981                                        const char *buf, size_t count)
 982 {
 983         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 984         struct netdev_queue *queue = to_netdev_queue(kobj);
 985
 986         if (!attribute->store)
 987                 return -EIO;
 988
 989         return attribute->store(queue, attribute, buf, count);
 990 }
 991
 992 static const struct sysfs_ops netdev_queue_sysfs_ops = {
 993         .show = netdev_queue_attr_show,
 994         .store = netdev_queue_attr_store,
 995 };
 996
 997 static ssize_t show_trans_timeout(struct netdev_queue *queue,
 998                                   struct netdev_queue_attribute *attribute,
 999                                   char *buf)
1000 {
1001         unsigned long trans_timeout;
1002
1003         spin_lock_irq(&queue->_xmit_lock);
1004         trans_timeout = queue->trans_timeout;
1005         spin_unlock_irq(&queue->_xmit_lock);
1006
1007         return sprintf(buf, "%lu", trans_timeout);
1008 }
1009
1010 #ifdef CONFIG_XPS
1011 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1012 {
1013         struct net_device *dev = queue->dev;
1014         unsigned int i;
1015
1016         i = queue - dev->_tx;
1017         BUG_ON(i >= dev->num_tx_queues);
1018
1019         return i;
1020 }
1021
1022 static ssize_t show_tx_maxrate(struct netdev_queue *queue,
1023                                struct netdev_queue_attribute *attribute,
1024                                char *buf)
1025 {
1026         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1027 }
1028
1029 static ssize_t set_tx_maxrate(struct netdev_queue *queue,
1030                               struct netdev_queue_attribute *attribute,
1031                               const char *buf, size_t len)
1032 {
1033         struct net_device *dev = queue->dev;
1034         int err, index = get_netdev_queue_index(queue);
1035         u32 rate = 0;
1036
1037         err = kstrtou32(buf, 10, &rate);
1038         if (err < 0)
1039                 return err;
1040
1041         if (!rtnl_trylock())
1042                 return restart_syscall();
1043
1044         err = -EOPNOTSUPP;
1045         if (dev->netdev_ops->ndo_set_tx_maxrate)
1046                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1047
1048         rtnl_unlock();
1049         if (!err) {
1050                 queue->tx_maxrate = rate;
1051                 return len;
1052         }
1053         return err;
1054 }
1055
1056 static struct netdev_queue_attribute queue_tx_maxrate =
1057         __ATTR(tx_maxrate, S_IRUGO | S_IWUSR,
1058                show_tx_maxrate, set_tx_maxrate);
1059 #endif
1060
1061 static struct netdev_queue_attribute queue_trans_timeout =
1062         __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
1063
1064 #ifdef CONFIG_BQL
1065 /*
1066  * Byte queue limits sysfs structures and functions.
1067  */
1068 static ssize_t bql_show(char *buf, unsigned int value)
1069 {
1070         return sprintf(buf, "%u\n", value);
1071 }
1072
1073 static ssize_t bql_set(const char *buf, const size_t count,
1074                        unsigned int *pvalue)
1075 {
1076         unsigned int value;
1077         int err;
1078
1079         if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
1080                 value = DQL_MAX_LIMIT;
1081         else {
1082                 err = kstrtouint(buf, 10, &value);
1083                 if (err < 0)
1084                         return err;
1085                 if (value > DQL_MAX_LIMIT)
1086                         return -EINVAL;
1087         }
1088
1089         *pvalue = value;
1090
1091         return count;
1092 }
1093
1094 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1095                                   struct netdev_queue_attribute *attr,
1096                                   char *buf)
1097 {
1098         struct dql *dql = &queue->dql;
1099
1100         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1101 }
1102
1103 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1104                                  struct netdev_queue_attribute *attribute,
1105                                  const char *buf, size_t len)
1106 {
1107         struct dql *dql = &queue->dql;
1108         unsigned int value;
1109         int err;
1110
1111         err = kstrtouint(buf, 10, &value);
1112         if (err < 0)
1113                 return err;
1114
1115         dql->slack_hold_time = msecs_to_jiffies(value);
1116
1117         return len;
1118 }
1119
1120 static struct netdev_queue_attribute bql_hold_time_attribute =
1121         __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
1122             bql_set_hold_time);
1123
1124 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1125                                  struct netdev_queue_attribute *attr,
1126                                  char *buf)
1127 {
1128         struct dql *dql = &queue->dql;
1129
1130         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1131 }
1132
1133 static struct netdev_queue_attribute bql_inflight_attribute =
1134         __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1135
1136 #define BQL_ATTR(NAME, FIELD)                                           \
1137 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1138                                  struct netdev_queue_attribute *attr,   \
1139                                  char *buf)                             \
1140 {                                                                       \
1141         return bql_show(buf, queue->dql.FIELD);                         \
1142 }                                                                       \
1143                                                                         \
1144 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1145                                 struct netdev_queue_attribute *attr,    \
1146                                 const char *buf, size_t len)            \
1147 {                                                                       \
1148         return bql_set(buf, len, &queue->dql.FIELD);                    \
1149 }                                                                       \
1150                                                                         \
1151 static struct netdev_queue_attribute bql_ ## NAME ## _attribute =       \
1152         __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME,              \
1153             bql_set_ ## NAME);
1154
1155 BQL_ATTR(limit, limit)
1156 BQL_ATTR(limit_max, max_limit)
1157 BQL_ATTR(limit_min, min_limit)
1158
1159 static struct attribute *dql_attrs[] = {
1160         &bql_limit_attribute.attr,
1161         &bql_limit_max_attribute.attr,
1162         &bql_limit_min_attribute.attr,
1163         &bql_hold_time_attribute.attr,
1164         &bql_inflight_attribute.attr,
1165         NULL
1166 };
1167
1168 static struct attribute_group dql_group = {
1169         .name  = "byte_queue_limits",
1170         .attrs  = dql_attrs,
1171 };
1172 #endif /* CONFIG_BQL */
1173
1174 #ifdef CONFIG_XPS
1175 static ssize_t show_xps_map(struct netdev_queue *queue,
1176                             struct netdev_queue_attribute *attribute, char *buf)
1177 {
1178         struct net_device *dev = queue->dev;
1179         struct xps_dev_maps *dev_maps;
1180         cpumask_var_t mask;
1181         unsigned long index;
1182         int i, len;
1183
1184         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1185                 return -ENOMEM;
1186
1187         index = get_netdev_queue_index(queue);
1188
1189         rcu_read_lock();
1190         dev_maps = rcu_dereference(dev->xps_maps);
1191         if (dev_maps) {
1192                 for_each_possible_cpu(i) {
1193                         struct xps_map *map =
1194                             rcu_dereference(dev_maps->cpu_map[i]);
1195                         if (map) {
1196                                 int j;
1197                                 for (j = 0; j < map->len; j++) {
1198                                         if (map->queues[j] == index) {
1199                                                 cpumask_set_cpu(i, mask);
1200                                                 break;
1201                                         }
1202                                 }
1203                         }
1204                 }
1205         }
1206         rcu_read_unlock();
1207
1208         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1209         free_cpumask_var(mask);
1210         return len < PAGE_SIZE ? len : -EINVAL;
1211 }
1212
1213 static ssize_t store_xps_map(struct netdev_queue *queue,
1214                       struct netdev_queue_attribute *attribute,
1215                       const char *buf, size_t len)
1216 {
1217         struct net_device *dev = queue->dev;
1218         unsigned long index;
1219         cpumask_var_t mask;
1220         int err;
1221
1222         if (!capable(CAP_NET_ADMIN))
1223                 return -EPERM;
1224
1225         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1226                 return -ENOMEM;
1227
1228         index = get_netdev_queue_index(queue);
1229
1230         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1231         if (err) {
1232                 free_cpumask_var(mask);
1233                 return err;
1234         }
1235
1236         err = netif_set_xps_queue(dev, mask, index);
1237
1238         free_cpumask_var(mask);
1239
1240         return err ? : len;
1241 }
1242
1243 static struct netdev_queue_attribute xps_cpus_attribute =
1244     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1245 #endif /* CONFIG_XPS */
1246
1247 static struct attribute *netdev_queue_default_attrs[] = {
1248         &queue_trans_timeout.attr,
1249 #ifdef CONFIG_XPS
1250         &xps_cpus_attribute.attr,
1251         &queue_tx_maxrate.attr,
1252 #endif
1253         NULL
1254 };
1255
1256 static void netdev_queue_release(struct kobject *kobj)
1257 {
1258         struct netdev_queue *queue = to_netdev_queue(kobj);
1259
1260         memset(kobj, 0, sizeof(*kobj));
1261         dev_put(queue->dev);
1262 }
1263
1264 static const void *netdev_queue_namespace(struct kobject *kobj)
1265 {
1266         struct netdev_queue *queue = to_netdev_queue(kobj);
1267         struct device *dev = &queue->dev->dev;
1268         const void *ns = NULL;
1269
1270         if (dev->class && dev->class->ns_type)
1271                 ns = dev->class->namespace(dev);
1272
1273         return ns;
1274 }
1275
1276 static struct kobj_type netdev_queue_ktype = {
1277         .sysfs_ops = &netdev_queue_sysfs_ops,
1278         .release = netdev_queue_release,
1279         .default_attrs = netdev_queue_default_attrs,
1280         .namespace = netdev_queue_namespace,
1281 };
1282
1283 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1284 {
1285         struct netdev_queue *queue = dev->_tx + index;
1286         struct kobject *kobj = &queue->kobj;
1287         int error = 0;
1288
1289         kobj->kset = dev->queues_kset;
1290         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1291             "tx-%u", index);
1292         if (error)
1293                 goto exit;
1294
1295 #ifdef CONFIG_BQL
1296         error = sysfs_create_group(kobj, &dql_group);
1297         if (error)
1298                 goto exit;
1299 #endif
1300
1301         kobject_uevent(kobj, KOBJ_ADD);
1302         dev_hold(queue->dev);
1303
1304         return 0;
1305 exit:
1306         kobject_put(kobj);
1307         return error;
1308 }
1309 #endif /* CONFIG_SYSFS */
1310
1311 int
1312 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1313 {
1314 #ifdef CONFIG_SYSFS
1315         int i;
1316         int error = 0;
1317
1318         for (i = old_num; i < new_num; i++) {
1319                 error = netdev_queue_add_kobject(dev, i);
1320                 if (error) {
1321                         new_num = old_num;
1322                         break;
1323                 }
1324         }
1325
1326         while (--i >= new_num) {
1327                 struct netdev_queue *queue = dev->_tx + i;
1328
1329 #ifdef CONFIG_BQL
1330                 sysfs_remove_group(&queue->kobj, &dql_group);
1331 #endif
1332                 kobject_put(&queue->kobj);
1333         }
1334
1335         return error;
1336 #else
1337         return 0;
1338 #endif /* CONFIG_SYSFS */
1339 }
1340
1341 static int register_queue_kobjects(struct net_device *dev)
1342 {
1343         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1344
1345 #ifdef CONFIG_SYSFS
1346         dev->queues_kset = kset_create_and_add("queues",
1347             NULL, &dev->dev.kobj);
1348         if (!dev->queues_kset)
1349                 return -ENOMEM;
1350         real_rx = dev->real_num_rx_queues;
1351 #endif
1352         real_tx = dev->real_num_tx_queues;
1353
1354         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1355         if (error)
1356                 goto error;
1357         rxq = real_rx;
1358
1359         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1360         if (error)
1361                 goto error;
1362         txq = real_tx;
1363
1364         return 0;
1365
1366 error:
1367         netdev_queue_update_kobjects(dev, txq, 0);
1368         net_rx_queue_update_kobjects(dev, rxq, 0);
1369         return error;
1370 }
1371
1372 static void remove_queue_kobjects(struct net_device *dev)
1373 {
1374         int real_rx = 0, real_tx = 0;
1375
1376 #ifdef CONFIG_SYSFS
1377         real_rx = dev->real_num_rx_queues;
1378 #endif
1379         real_tx = dev->real_num_tx_queues;
1380
1381         net_rx_queue_update_kobjects(dev, real_rx, 0);
1382         netdev_queue_update_kobjects(dev, real_tx, 0);
1383 #ifdef CONFIG_SYSFS
1384         kset_unregister(dev->queues_kset);
1385 #endif
1386 }
1387
1388 static bool net_current_may_mount(void)
1389 {
1390         struct net *net = current->nsproxy->net_ns;
1391
1392         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1393 }
1394
1395 static void *net_grab_current_ns(void)
1396 {
1397         struct net *ns = current->nsproxy->net_ns;
1398 #ifdef CONFIG_NET_NS
1399         if (ns)
1400                 atomic_inc(&ns->passive);
1401 #endif
1402         return ns;
1403 }
1404
1405 static const void *net_initial_ns(void)
1406 {
1407         return &init_net;
1408 }
1409
1410 static const void *net_netlink_ns(struct sock *sk)
1411 {
1412         return sock_net(sk);
1413 }
1414
1415 struct kobj_ns_type_operations net_ns_type_operations = {
1416         .type = KOBJ_NS_TYPE_NET,
1417         .current_may_mount = net_current_may_mount,
1418         .grab_current_ns = net_grab_current_ns,
1419         .netlink_ns = net_netlink_ns,
1420         .initial_ns = net_initial_ns,
1421         .drop_ns = net_drop_ns,
1422 };
1423 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1424
1425 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1426 {
1427         struct net_device *dev = to_net_dev(d);
1428         int retval;
1429
1430         /* pass interface to uevent. */
1431         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1432         if (retval)
1433                 goto exit;
1434
1435         /* pass ifindex to uevent.
1436          * ifindex is useful as it won't change (interface name may change)
1437          * and is what RtNetlink uses natively. */
1438         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1439
1440 exit:
1441         return retval;
1442 }
1443
1444 /*
1445  *      netdev_release -- destroy and free a dead device.
1446  *      Called when last reference to device kobject is gone.
1447  */
1448 static void netdev_release(struct device *d)
1449 {
1450         struct net_device *dev = to_net_dev(d);
1451
1452         BUG_ON(dev->reg_state != NETREG_RELEASED);
1453
1454         kfree(dev->ifalias);
1455         netdev_freemem(dev);
1456 }
1457
1458 static const void *net_namespace(struct device *d)
1459 {
1460         struct net_device *dev = to_net_dev(d);
1461
1462         return dev_net(dev);
1463 }
1464
1465 static struct class net_class = {
1466         .name = "net",
1467         .dev_release = netdev_release,
1468         .dev_groups = net_class_groups,
1469         .dev_uevent = netdev_uevent,
1470         .ns_type = &net_ns_type_operations,
1471         .namespace = net_namespace,
1472 };
1473
1474 #ifdef CONFIG_OF_NET
1475 static int of_dev_node_match(struct device *dev, const void *data)
1476 {
1477         int ret = 0;
1478
1479         if (dev->parent)
1480                 ret = dev->parent->of_node == data;
1481
1482         return ret == 0 ? dev->of_node == data : ret;
1483 }
1484
1485 /*
1486  * of_find_net_device_by_node - lookup the net device for the device node
1487  * @np: OF device node
1488  *
1489  * Looks up the net_device structure corresponding with the device node.
1490  * If successful, returns a pointer to the net_device with the embedded
1491  * struct device refcount incremented by one, or NULL on failure. The
1492  * refcount must be dropped when done with the net_device.
1493  */
1494 struct net_device *of_find_net_device_by_node(struct device_node *np)
1495 {
1496         struct device *dev;
1497
1498         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1499         if (!dev)
1500                 return NULL;
1501
1502         return to_net_dev(dev);
1503 }
1504 EXPORT_SYMBOL(of_find_net_device_by_node);
1505 #endif
1506
1507 /* Delete sysfs entries but hold kobject reference until after all
1508  * netdev references are gone.
1509  */
1510 void netdev_unregister_kobject(struct net_device *ndev)
1511 {
1512         struct device *dev = &(ndev->dev);
1513
1514         kobject_get(&dev->kobj);
1515
1516         remove_queue_kobjects(ndev);
1517
1518         pm_runtime_set_memalloc_noio(dev, false);
1519
1520         device_del(dev);
1521 }
1522
1523 /* Create sysfs entries for network device. */
1524 int netdev_register_kobject(struct net_device *ndev)
1525 {
1526         struct device *dev = &(ndev->dev);
1527         const struct attribute_group **groups = ndev->sysfs_groups;
1528         int error = 0;
1529
1530         device_initialize(dev);
1531         dev->class = &net_class;
1532         dev->platform_data = ndev;
1533         dev->groups = groups;
1534
1535         dev_set_name(dev, "%s", ndev->name);
1536
1537 #ifdef CONFIG_SYSFS
1538         /* Allow for a device specific group */
1539         if (*groups)
1540                 groups++;
1541
1542         *groups++ = &netstat_group;
1543
1544 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1545         if (ndev->ieee80211_ptr)
1546                 *groups++ = &wireless_group;
1547 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1548         else if (ndev->wireless_handlers)
1549                 *groups++ = &wireless_group;
1550 #endif
1551 #endif
1552 #endif /* CONFIG_SYSFS */
1553
1554         error = device_add(dev);
1555         if (error)
1556                 return error;
1557
1558         error = register_queue_kobjects(ndev);
1559         if (error) {
1560                 device_del(dev);
1561                 return error;
1562         }
1563
1564         pm_runtime_set_memalloc_noio(dev, true);
1565
1566         return error;
1567 }
1568
1569 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1570                                 const void *ns)
1571 {
1572         return class_create_file_ns(&net_class, class_attr, ns);
1573 }
1574 EXPORT_SYMBOL(netdev_class_create_file_ns);
1575
1576 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1577                                  const void *ns)
1578 {
1579         class_remove_file_ns(&net_class, class_attr, ns);
1580 }
1581 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1582
1583 int __init netdev_kobject_init(void)
1584 {
1585         kobj_ns_type_register(&net_ns_type_operations);
1586         return class_register(&net_class);
1587 }