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/sched/signal.h>
  19 #include <linux/nsproxy.h>
  20 #include <net/sock.h>
  21 #include <net/net_namespace.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/vmalloc.h>
  24 #include <linux/export.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/pm_runtime.h>
  27 #include <linux/of.h>
  28 #include <linux/of_net.h>
  29
  30 #include "net-sysfs.h"
  31
  32 #ifdef CONFIG_SYSFS
  33 static const char fmt_hex[] = "%#x\n";
  34 static const char fmt_dec[] = "%d\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                 ret = (*set)(netdev, new);
 101                 if (ret == 0)
 102                         ret = len;
 103         }
 104         rtnl_unlock();
 105  err:
 106         return ret;
 107 }
 108
 109 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 110 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 111 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 112 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 113 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 114 NETDEVICE_SHOW_RO(type, fmt_dec);
 115 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 116
 117 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
 118                            char *buf)
 119 {
 120         struct net_device *ndev = to_net_dev(dev);
 121
 122         return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
 123 }
 124 static DEVICE_ATTR_RO(iflink);
 125
 126 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 127 {
 128         return sprintf(buf, fmt_dec, dev->name_assign_type);
 129 }
 130
 131 static ssize_t name_assign_type_show(struct device *dev,
 132                                      struct device_attribute *attr,
 133                                      char *buf)
 134 {
 135         struct net_device *ndev = to_net_dev(dev);
 136         ssize_t ret = -EINVAL;
 137
 138         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
 139                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
 140
 141         return ret;
 142 }
 143 static DEVICE_ATTR_RO(name_assign_type);
 144
 145 /* use same locking rules as GIFHWADDR ioctl's */
 146 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 147                             char *buf)
 148 {
 149         struct net_device *ndev = to_net_dev(dev);
 150         ssize_t ret = -EINVAL;
 151
 152         read_lock(&dev_base_lock);
 153         if (dev_isalive(ndev))
 154                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 155         read_unlock(&dev_base_lock);
 156         return ret;
 157 }
 158 static DEVICE_ATTR_RO(address);
 159
 160 static ssize_t broadcast_show(struct device *dev,
 161                               struct device_attribute *attr, char *buf)
 162 {
 163         struct net_device *ndev = to_net_dev(dev);
 164
 165         if (dev_isalive(ndev))
 166                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
 167         return -EINVAL;
 168 }
 169 static DEVICE_ATTR_RO(broadcast);
 170
 171 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
 172 {
 173         if (!netif_running(dev))
 174                 return -EINVAL;
 175         return dev_change_carrier(dev, (bool)new_carrier);
 176 }
 177
 178 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 179                              const char *buf, size_t len)
 180 {
 181         return netdev_store(dev, attr, buf, len, change_carrier);
 182 }
 183
 184 static ssize_t carrier_show(struct device *dev,
 185                             struct device_attribute *attr, char *buf)
 186 {
 187         struct net_device *netdev = to_net_dev(dev);
 188
 189         if (netif_running(netdev))
 190                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 191
 192         return -EINVAL;
 193 }
 194 static DEVICE_ATTR_RW(carrier);
 195
 196 static ssize_t speed_show(struct device *dev,
 197                           struct device_attribute *attr, char *buf)
 198 {
 199         struct net_device *netdev = to_net_dev(dev);
 200         int ret = -EINVAL;
 201
 202         if (!rtnl_trylock())
 203                 return restart_syscall();
 204
 205         if (netif_running(netdev)) {
 206                 struct ethtool_link_ksettings cmd;
 207
 208                 if (!__ethtool_get_link_ksettings(netdev, &cmd))
 209                         ret = sprintf(buf, fmt_dec, cmd.base.speed);
 210         }
 211         rtnl_unlock();
 212         return ret;
 213 }
 214 static DEVICE_ATTR_RO(speed);
 215
 216 static ssize_t duplex_show(struct device *dev,
 217                            struct device_attribute *attr, char *buf)
 218 {
 219         struct net_device *netdev = to_net_dev(dev);
 220         int ret = -EINVAL;
 221
 222         if (!rtnl_trylock())
 223                 return restart_syscall();
 224
 225         if (netif_running(netdev)) {
 226                 struct ethtool_link_ksettings cmd;
 227
 228                 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
 229                         const char *duplex;
 230
 231                         switch (cmd.base.duplex) {
 232                         case DUPLEX_HALF:
 233                                 duplex = "half";
 234                                 break;
 235                         case DUPLEX_FULL:
 236                                 duplex = "full";
 237                                 break;
 238                         default:
 239                                 duplex = "unknown";
 240                                 break;
 241                         }
 242                         ret = sprintf(buf, "%s\n", duplex);
 243                 }
 244         }
 245         rtnl_unlock();
 246         return ret;
 247 }
 248 static DEVICE_ATTR_RO(duplex);
 249
 250 static ssize_t dormant_show(struct device *dev,
 251                             struct device_attribute *attr, char *buf)
 252 {
 253         struct net_device *netdev = to_net_dev(dev);
 254
 255         if (netif_running(netdev))
 256                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 257
 258         return -EINVAL;
 259 }
 260 static DEVICE_ATTR_RO(dormant);
 261
 262 static const char *const operstates[] = {
 263         "unknown",
 264         "notpresent", /* currently unused */
 265         "down",
 266         "lowerlayerdown",
 267         "testing", /* currently unused */
 268         "dormant",
 269         "up"
 270 };
 271
 272 static ssize_t operstate_show(struct device *dev,
 273                               struct device_attribute *attr, char *buf)
 274 {
 275         const struct net_device *netdev = to_net_dev(dev);
 276         unsigned char operstate;
 277
 278         read_lock(&dev_base_lock);
 279         operstate = netdev->operstate;
 280         if (!netif_running(netdev))
 281                 operstate = IF_OPER_DOWN;
 282         read_unlock(&dev_base_lock);
 283
 284         if (operstate >= ARRAY_SIZE(operstates))
 285                 return -EINVAL; /* should not happen */
 286
 287         return sprintf(buf, "%s\n", operstates[operstate]);
 288 }
 289 static DEVICE_ATTR_RO(operstate);
 290
 291 static ssize_t carrier_changes_show(struct device *dev,
 292                                     struct device_attribute *attr,
 293                                     char *buf)
 294 {
 295         struct net_device *netdev = to_net_dev(dev);
 296
 297         return sprintf(buf, fmt_dec,
 298                        atomic_read(&netdev->carrier_changes));
 299 }
 300 static DEVICE_ATTR_RO(carrier_changes);
 301
 302 /* read-write attributes */
 303
 304 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 305 {
 306         return dev_set_mtu(dev, (int)new_mtu);
 307 }
 308
 309 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 310                          const char *buf, size_t len)
 311 {
 312         return netdev_store(dev, attr, buf, len, change_mtu);
 313 }
 314 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 315
 316 static int change_flags(struct net_device *dev, unsigned long new_flags)
 317 {
 318         return dev_change_flags(dev, (unsigned int)new_flags);
 319 }
 320
 321 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 322                            const char *buf, size_t len)
 323 {
 324         return netdev_store(dev, attr, buf, len, change_flags);
 325 }
 326 NETDEVICE_SHOW_RW(flags, fmt_hex);
 327
 328 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
 329 {
 330         unsigned int orig_len = dev->tx_queue_len;
 331         int res;
 332
 333         if (new_len != (unsigned int)new_len)
 334                 return -ERANGE;
 335
 336         if (new_len != orig_len) {
 337                 dev->tx_queue_len = new_len;
 338                 res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev);
 339                 res = notifier_to_errno(res);
 340                 if (res) {
 341                         netdev_err(dev,
 342                                    "refused to change device tx_queue_len\n");
 343                         dev->tx_queue_len = orig_len;
 344                         return -EFAULT;
 345                 }
 346         }
 347
 348         return 0;
 349 }
 350
 351 static ssize_t tx_queue_len_store(struct device *dev,
 352                                   struct device_attribute *attr,
 353                                   const char *buf, size_t len)
 354 {
 355         if (!capable(CAP_NET_ADMIN))
 356                 return -EPERM;
 357
 358         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
 359 }
 360 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
 361
 362 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 363 {
 364         dev->gro_flush_timeout = val;
 365         return 0;
 366 }
 367
 368 static ssize_t gro_flush_timeout_store(struct device *dev,
 369                                        struct device_attribute *attr,
 370                                        const char *buf, size_t len)
 371 {
 372         if (!capable(CAP_NET_ADMIN))
 373                 return -EPERM;
 374
 375         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 376 }
 377 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 378
 379 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 380                              const char *buf, size_t len)
 381 {
 382         struct net_device *netdev = to_net_dev(dev);
 383         struct net *net = dev_net(netdev);
 384         size_t count = len;
 385         ssize_t ret;
 386
 387         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 388                 return -EPERM;
 389
 390         /* ignore trailing newline */
 391         if (len >  0 && buf[len - 1] == '\n')
 392                 --count;
 393
 394         if (!rtnl_trylock())
 395                 return restart_syscall();
 396         ret = dev_set_alias(netdev, buf, count);
 397         rtnl_unlock();
 398
 399         return ret < 0 ? ret : len;
 400 }
 401
 402 static ssize_t ifalias_show(struct device *dev,
 403                             struct device_attribute *attr, char *buf)
 404 {
 405         const struct net_device *netdev = to_net_dev(dev);
 406         ssize_t ret = 0;
 407
 408         if (!rtnl_trylock())
 409                 return restart_syscall();
 410         if (netdev->ifalias)
 411                 ret = sprintf(buf, "%s\n", netdev->ifalias);
 412         rtnl_unlock();
 413         return ret;
 414 }
 415 static DEVICE_ATTR_RW(ifalias);
 416
 417 static int change_group(struct net_device *dev, unsigned long new_group)
 418 {
 419         dev_set_group(dev, (int)new_group);
 420         return 0;
 421 }
 422
 423 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 424                            const char *buf, size_t len)
 425 {
 426         return netdev_store(dev, attr, buf, len, change_group);
 427 }
 428 NETDEVICE_SHOW(group, fmt_dec);
 429 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
 430
 431 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 432 {
 433         return dev_change_proto_down(dev, (bool)proto_down);
 434 }
 435
 436 static ssize_t proto_down_store(struct device *dev,
 437                                 struct device_attribute *attr,
 438                                 const char *buf, size_t len)
 439 {
 440         return netdev_store(dev, attr, buf, len, change_proto_down);
 441 }
 442 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 443
 444 static ssize_t phys_port_id_show(struct device *dev,
 445                                  struct device_attribute *attr, char *buf)
 446 {
 447         struct net_device *netdev = to_net_dev(dev);
 448         ssize_t ret = -EINVAL;
 449
 450         if (!rtnl_trylock())
 451                 return restart_syscall();
 452
 453         if (dev_isalive(netdev)) {
 454                 struct netdev_phys_item_id ppid;
 455
 456                 ret = dev_get_phys_port_id(netdev, &ppid);
 457                 if (!ret)
 458                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 459         }
 460         rtnl_unlock();
 461
 462         return ret;
 463 }
 464 static DEVICE_ATTR_RO(phys_port_id);
 465
 466 static ssize_t phys_port_name_show(struct device *dev,
 467                                    struct device_attribute *attr, char *buf)
 468 {
 469         struct net_device *netdev = to_net_dev(dev);
 470         ssize_t ret = -EINVAL;
 471
 472         if (!rtnl_trylock())
 473                 return restart_syscall();
 474
 475         if (dev_isalive(netdev)) {
 476                 char name[IFNAMSIZ];
 477
 478                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 479                 if (!ret)
 480                         ret = sprintf(buf, "%s\n", name);
 481         }
 482         rtnl_unlock();
 483
 484         return ret;
 485 }
 486 static DEVICE_ATTR_RO(phys_port_name);
 487
 488 static ssize_t phys_switch_id_show(struct device *dev,
 489                                    struct device_attribute *attr, char *buf)
 490 {
 491         struct net_device *netdev = to_net_dev(dev);
 492         ssize_t ret = -EINVAL;
 493
 494         if (!rtnl_trylock())
 495                 return restart_syscall();
 496
 497         if (dev_isalive(netdev)) {
 498                 struct switchdev_attr attr = {
 499                         .orig_dev = netdev,
 500                         .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
 501                         .flags = SWITCHDEV_F_NO_RECURSE,
 502                 };
 503
 504                 ret = switchdev_port_attr_get(netdev, &attr);
 505                 if (!ret)
 506                         ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
 507                                       attr.u.ppid.id);
 508         }
 509         rtnl_unlock();
 510
 511         return ret;
 512 }
 513 static DEVICE_ATTR_RO(phys_switch_id);
 514
 515 static struct attribute *net_class_attrs[] __ro_after_init = {
 516         &dev_attr_netdev_group.attr,
 517         &dev_attr_type.attr,
 518         &dev_attr_dev_id.attr,
 519         &dev_attr_dev_port.attr,
 520         &dev_attr_iflink.attr,
 521         &dev_attr_ifindex.attr,
 522         &dev_attr_name_assign_type.attr,
 523         &dev_attr_addr_assign_type.attr,
 524         &dev_attr_addr_len.attr,
 525         &dev_attr_link_mode.attr,
 526         &dev_attr_address.attr,
 527         &dev_attr_broadcast.attr,
 528         &dev_attr_speed.attr,
 529         &dev_attr_duplex.attr,
 530         &dev_attr_dormant.attr,
 531         &dev_attr_operstate.attr,
 532         &dev_attr_carrier_changes.attr,
 533         &dev_attr_ifalias.attr,
 534         &dev_attr_carrier.attr,
 535         &dev_attr_mtu.attr,
 536         &dev_attr_flags.attr,
 537         &dev_attr_tx_queue_len.attr,
 538         &dev_attr_gro_flush_timeout.attr,
 539         &dev_attr_phys_port_id.attr,
 540         &dev_attr_phys_port_name.attr,
 541         &dev_attr_phys_switch_id.attr,
 542         &dev_attr_proto_down.attr,
 543         NULL,
 544 };
 545 ATTRIBUTE_GROUPS(net_class);
 546
 547 /* Show a given an attribute in the statistics group */
 548 static ssize_t netstat_show(const struct device *d,
 549                             struct device_attribute *attr, char *buf,
 550                             unsigned long offset)
 551 {
 552         struct net_device *dev = to_net_dev(d);
 553         ssize_t ret = -EINVAL;
 554
 555         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 556                 offset % sizeof(u64) != 0);
 557
 558         read_lock(&dev_base_lock);
 559         if (dev_isalive(dev)) {
 560                 struct rtnl_link_stats64 temp;
 561                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 562
 563                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
 564         }
 565         read_unlock(&dev_base_lock);
 566         return ret;
 567 }
 568
 569 /* generate a read-only statistics attribute */
 570 #define NETSTAT_ENTRY(name)                                             \
 571 static ssize_t name##_show(struct device *d,                            \
 572                            struct device_attribute *attr, char *buf)    \
 573 {                                                                       \
 574         return netstat_show(d, attr, buf,                               \
 575                             offsetof(struct rtnl_link_stats64, name));  \
 576 }                                                                       \
 577 static DEVICE_ATTR_RO(name)
 578
 579 NETSTAT_ENTRY(rx_packets);
 580 NETSTAT_ENTRY(tx_packets);
 581 NETSTAT_ENTRY(rx_bytes);
 582 NETSTAT_ENTRY(tx_bytes);
 583 NETSTAT_ENTRY(rx_errors);
 584 NETSTAT_ENTRY(tx_errors);
 585 NETSTAT_ENTRY(rx_dropped);
 586 NETSTAT_ENTRY(tx_dropped);
 587 NETSTAT_ENTRY(multicast);
 588 NETSTAT_ENTRY(collisions);
 589 NETSTAT_ENTRY(rx_length_errors);
 590 NETSTAT_ENTRY(rx_over_errors);
 591 NETSTAT_ENTRY(rx_crc_errors);
 592 NETSTAT_ENTRY(rx_frame_errors);
 593 NETSTAT_ENTRY(rx_fifo_errors);
 594 NETSTAT_ENTRY(rx_missed_errors);
 595 NETSTAT_ENTRY(tx_aborted_errors);
 596 NETSTAT_ENTRY(tx_carrier_errors);
 597 NETSTAT_ENTRY(tx_fifo_errors);
 598 NETSTAT_ENTRY(tx_heartbeat_errors);
 599 NETSTAT_ENTRY(tx_window_errors);
 600 NETSTAT_ENTRY(rx_compressed);
 601 NETSTAT_ENTRY(tx_compressed);
 602 NETSTAT_ENTRY(rx_nohandler);
 603
 604 static struct attribute *netstat_attrs[] __ro_after_init = {
 605         &dev_attr_rx_packets.attr,
 606         &dev_attr_tx_packets.attr,
 607         &dev_attr_rx_bytes.attr,
 608         &dev_attr_tx_bytes.attr,
 609         &dev_attr_rx_errors.attr,
 610         &dev_attr_tx_errors.attr,
 611         &dev_attr_rx_dropped.attr,
 612         &dev_attr_tx_dropped.attr,
 613         &dev_attr_multicast.attr,
 614         &dev_attr_collisions.attr,
 615         &dev_attr_rx_length_errors.attr,
 616         &dev_attr_rx_over_errors.attr,
 617         &dev_attr_rx_crc_errors.attr,
 618         &dev_attr_rx_frame_errors.attr,
 619         &dev_attr_rx_fifo_errors.attr,
 620         &dev_attr_rx_missed_errors.attr,
 621         &dev_attr_tx_aborted_errors.attr,
 622         &dev_attr_tx_carrier_errors.attr,
 623         &dev_attr_tx_fifo_errors.attr,
 624         &dev_attr_tx_heartbeat_errors.attr,
 625         &dev_attr_tx_window_errors.attr,
 626         &dev_attr_rx_compressed.attr,
 627         &dev_attr_tx_compressed.attr,
 628         &dev_attr_rx_nohandler.attr,
 629         NULL
 630 };
 631
 632 static const struct attribute_group netstat_group = {
 633         .name  = "statistics",
 634         .attrs  = netstat_attrs,
 635 };
 636
 637 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 638 static struct attribute *wireless_attrs[] = {
 639         NULL
 640 };
 641
 642 static const struct attribute_group wireless_group = {
 643         .name = "wireless",
 644         .attrs = wireless_attrs,
 645 };
 646 #endif
 647
 648 #else /* CONFIG_SYSFS */
 649 #define net_class_groups        NULL
 650 #endif /* CONFIG_SYSFS */
 651
 652 #ifdef CONFIG_SYSFS
 653 #define to_rx_queue_attr(_attr) \
 654         container_of(_attr, struct rx_queue_attribute, attr)
 655
 656 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 657
 658 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 659                                   char *buf)
 660 {
 661         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 662         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 663
 664         if (!attribute->show)
 665                 return -EIO;
 666
 667         return attribute->show(queue, buf);
 668 }
 669
 670 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 671                                    const char *buf, size_t count)
 672 {
 673         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 674         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 675
 676         if (!attribute->store)
 677                 return -EIO;
 678
 679         return attribute->store(queue, buf, count);
 680 }
 681
 682 static const struct sysfs_ops rx_queue_sysfs_ops = {
 683         .show = rx_queue_attr_show,
 684         .store = rx_queue_attr_store,
 685 };
 686
 687 #ifdef CONFIG_RPS
 688 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
 689 {
 690         struct rps_map *map;
 691         cpumask_var_t mask;
 692         int i, len;
 693
 694         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 695                 return -ENOMEM;
 696
 697         rcu_read_lock();
 698         map = rcu_dereference(queue->rps_map);
 699         if (map)
 700                 for (i = 0; i < map->len; i++)
 701                         cpumask_set_cpu(map->cpus[i], mask);
 702
 703         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 704         rcu_read_unlock();
 705         free_cpumask_var(mask);
 706
 707         return len < PAGE_SIZE ? len : -EINVAL;
 708 }
 709
 710 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 711                              const char *buf, size_t len)
 712 {
 713         struct rps_map *old_map, *map;
 714         cpumask_var_t mask;
 715         int err, cpu, i;
 716         static DEFINE_MUTEX(rps_map_mutex);
 717
 718         if (!capable(CAP_NET_ADMIN))
 719                 return -EPERM;
 720
 721         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 722                 return -ENOMEM;
 723
 724         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 725         if (err) {
 726                 free_cpumask_var(mask);
 727                 return err;
 728         }
 729
 730         map = kzalloc(max_t(unsigned int,
 731                             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 732                       GFP_KERNEL);
 733         if (!map) {
 734                 free_cpumask_var(mask);
 735                 return -ENOMEM;
 736         }
 737
 738         i = 0;
 739         for_each_cpu_and(cpu, mask, cpu_online_mask)
 740                 map->cpus[i++] = cpu;
 741
 742         if (i) {
 743                 map->len = i;
 744         } else {
 745                 kfree(map);
 746                 map = NULL;
 747         }
 748
 749         mutex_lock(&rps_map_mutex);
 750         old_map = rcu_dereference_protected(queue->rps_map,
 751                                             mutex_is_locked(&rps_map_mutex));
 752         rcu_assign_pointer(queue->rps_map, map);
 753
 754         if (map)
 755                 static_key_slow_inc(&rps_needed);
 756         if (old_map)
 757                 static_key_slow_dec(&rps_needed);
 758
 759         mutex_unlock(&rps_map_mutex);
 760
 761         if (old_map)
 762                 kfree_rcu(old_map, rcu);
 763
 764         free_cpumask_var(mask);
 765         return len;
 766 }
 767
 768 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 769                                            char *buf)
 770 {
 771         struct rps_dev_flow_table *flow_table;
 772         unsigned long val = 0;
 773
 774         rcu_read_lock();
 775         flow_table = rcu_dereference(queue->rps_flow_table);
 776         if (flow_table)
 777                 val = (unsigned long)flow_table->mask + 1;
 778         rcu_read_unlock();
 779
 780         return sprintf(buf, "%lu\n", val);
 781 }
 782
 783 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 784 {
 785         struct rps_dev_flow_table *table = container_of(rcu,
 786             struct rps_dev_flow_table, rcu);
 787         vfree(table);
 788 }
 789
 790 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 791                                             const char *buf, size_t len)
 792 {
 793         unsigned long mask, count;
 794         struct rps_dev_flow_table *table, *old_table;
 795         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 796         int rc;
 797
 798         if (!capable(CAP_NET_ADMIN))
 799                 return -EPERM;
 800
 801         rc = kstrtoul(buf, 0, &count);
 802         if (rc < 0)
 803                 return rc;
 804
 805         if (count) {
 806                 mask = count - 1;
 807                 /* mask = roundup_pow_of_two(count) - 1;
 808                  * without overflows...
 809                  */
 810                 while ((mask | (mask >> 1)) != mask)
 811                         mask |= (mask >> 1);
 812                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 813                  * and on 32bit arches, must check
 814                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 815                  */
 816 #if BITS_PER_LONG > 32
 817                 if (mask > (unsigned long)(u32)mask)
 818                         return -EINVAL;
 819 #else
 820                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 821                                 / sizeof(struct rps_dev_flow)) {
 822                         /* Enforce a limit to prevent overflow */
 823                         return -EINVAL;
 824                 }
 825 #endif
 826                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 827                 if (!table)
 828                         return -ENOMEM;
 829
 830                 table->mask = mask;
 831                 for (count = 0; count <= mask; count++)
 832                         table->flows[count].cpu = RPS_NO_CPU;
 833         } else {
 834                 table = NULL;
 835         }
 836
 837         spin_lock(&rps_dev_flow_lock);
 838         old_table = rcu_dereference_protected(queue->rps_flow_table,
 839                                               lockdep_is_held(&rps_dev_flow_lock));
 840         rcu_assign_pointer(queue->rps_flow_table, table);
 841         spin_unlock(&rps_dev_flow_lock);
 842
 843         if (old_table)
 844                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 845
 846         return len;
 847 }
 848
 849 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
 850         = __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 851
 852 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
 853         = __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 854                  show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 855 #endif /* CONFIG_RPS */
 856
 857 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
 858 #ifdef CONFIG_RPS
 859         &rps_cpus_attribute.attr,
 860         &rps_dev_flow_table_cnt_attribute.attr,
 861 #endif
 862         NULL
 863 };
 864
 865 static void rx_queue_release(struct kobject *kobj)
 866 {
 867         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 868 #ifdef CONFIG_RPS
 869         struct rps_map *map;
 870         struct rps_dev_flow_table *flow_table;
 871
 872         map = rcu_dereference_protected(queue->rps_map, 1);
 873         if (map) {
 874                 RCU_INIT_POINTER(queue->rps_map, NULL);
 875                 kfree_rcu(map, rcu);
 876         }
 877
 878         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 879         if (flow_table) {
 880                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 881                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 882         }
 883 #endif
 884
 885         memset(kobj, 0, sizeof(*kobj));
 886         dev_put(queue->dev);
 887 }
 888
 889 static const void *rx_queue_namespace(struct kobject *kobj)
 890 {
 891         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 892         struct device *dev = &queue->dev->dev;
 893         const void *ns = NULL;
 894
 895         if (dev->class && dev->class->ns_type)
 896                 ns = dev->class->namespace(dev);
 897
 898         return ns;
 899 }
 900
 901 static struct kobj_type rx_queue_ktype __ro_after_init = {
 902         .sysfs_ops = &rx_queue_sysfs_ops,
 903         .release = rx_queue_release,
 904         .default_attrs = rx_queue_default_attrs,
 905         .namespace = rx_queue_namespace
 906 };
 907
 908 static int rx_queue_add_kobject(struct net_device *dev, int index)
 909 {
 910         struct netdev_rx_queue *queue = dev->_rx + index;
 911         struct kobject *kobj = &queue->kobj;
 912         int error = 0;
 913
 914         kobj->kset = dev->queues_kset;
 915         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 916                                      "rx-%u", index);
 917         if (error)
 918                 return error;
 919
 920         if (dev->sysfs_rx_queue_group) {
 921                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
 922                 if (error) {
 923                         kobject_put(kobj);
 924                         return error;
 925                 }
 926         }
 927
 928         kobject_uevent(kobj, KOBJ_ADD);
 929         dev_hold(queue->dev);
 930
 931         return error;
 932 }
 933 #endif /* CONFIG_SYSFS */
 934
 935 int
 936 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
 937 {
 938 #ifdef CONFIG_SYSFS
 939         int i;
 940         int error = 0;
 941
 942 #ifndef CONFIG_RPS
 943         if (!dev->sysfs_rx_queue_group)
 944                 return 0;
 945 #endif
 946         for (i = old_num; i < new_num; i++) {
 947                 error = rx_queue_add_kobject(dev, i);
 948                 if (error) {
 949                         new_num = old_num;
 950                         break;
 951                 }
 952         }
 953
 954         while (--i >= new_num) {
 955                 struct kobject *kobj = &dev->_rx[i].kobj;
 956
 957                 if (!atomic_read(&dev_net(dev)->count))
 958                         kobj->uevent_suppress = 1;
 959                 if (dev->sysfs_rx_queue_group)
 960                         sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
 961                 kobject_put(kobj);
 962         }
 963
 964         return error;
 965 #else
 966         return 0;
 967 #endif
 968 }
 969
 970 #ifdef CONFIG_SYSFS
 971 /*
 972  * netdev_queue sysfs structures and functions.
 973  */
 974 struct netdev_queue_attribute {
 975         struct attribute attr;
 976         ssize_t (*show)(struct netdev_queue *queue, char *buf);
 977         ssize_t (*store)(struct netdev_queue *queue,
 978                          const char *buf, size_t len);
 979 };
 980 #define to_netdev_queue_attr(_attr) \
 981         container_of(_attr, struct netdev_queue_attribute, attr)
 982
 983 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 984
 985 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 986                                       struct attribute *attr, char *buf)
 987 {
 988         const struct netdev_queue_attribute *attribute
 989                 = to_netdev_queue_attr(attr);
 990         struct netdev_queue *queue = to_netdev_queue(kobj);
 991
 992         if (!attribute->show)
 993                 return -EIO;
 994
 995         return attribute->show(queue, buf);
 996 }
 997
 998 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 999                                        struct attribute *attr,
1000                                        const char *buf, size_t count)
1001 {
1002         const struct netdev_queue_attribute *attribute
1003                 = to_netdev_queue_attr(attr);
1004         struct netdev_queue *queue = to_netdev_queue(kobj);
1005
1006         if (!attribute->store)
1007                 return -EIO;
1008
1009         return attribute->store(queue, buf, count);
1010 }
1011
1012 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1013         .show = netdev_queue_attr_show,
1014         .store = netdev_queue_attr_store,
1015 };
1016
1017 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1018 {
1019         unsigned long trans_timeout;
1020
1021         spin_lock_irq(&queue->_xmit_lock);
1022         trans_timeout = queue->trans_timeout;
1023         spin_unlock_irq(&queue->_xmit_lock);
1024
1025         return sprintf(buf, "%lu", trans_timeout);
1026 }
1027
1028 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1029 {
1030         struct net_device *dev = queue->dev;
1031         unsigned int i;
1032
1033         i = queue - dev->_tx;
1034         BUG_ON(i >= dev->num_tx_queues);
1035
1036         return i;
1037 }
1038
1039 static ssize_t traffic_class_show(struct netdev_queue *queue,
1040                                   char *buf)
1041 {
1042         struct net_device *dev = queue->dev;
1043         int index = get_netdev_queue_index(queue);
1044         int tc = netdev_txq_to_tc(dev, index);
1045
1046         if (tc < 0)
1047                 return -EINVAL;
1048
1049         return sprintf(buf, "%u\n", tc);
1050 }
1051
1052 #ifdef CONFIG_XPS
1053 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1054                                char *buf)
1055 {
1056         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1057 }
1058
1059 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1060                                 const char *buf, size_t len)
1061 {
1062         struct net_device *dev = queue->dev;
1063         int err, index = get_netdev_queue_index(queue);
1064         u32 rate = 0;
1065
1066         err = kstrtou32(buf, 10, &rate);
1067         if (err < 0)
1068                 return err;
1069
1070         if (!rtnl_trylock())
1071                 return restart_syscall();
1072
1073         err = -EOPNOTSUPP;
1074         if (dev->netdev_ops->ndo_set_tx_maxrate)
1075                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1076
1077         rtnl_unlock();
1078         if (!err) {
1079                 queue->tx_maxrate = rate;
1080                 return len;
1081         }
1082         return err;
1083 }
1084
1085 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1086         = __ATTR_RW(tx_maxrate);
1087 #endif
1088
1089 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1090         = __ATTR_RO(tx_timeout);
1091
1092 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1093         = __ATTR_RO(traffic_class);
1094
1095 #ifdef CONFIG_BQL
1096 /*
1097  * Byte queue limits sysfs structures and functions.
1098  */
1099 static ssize_t bql_show(char *buf, unsigned int value)
1100 {
1101         return sprintf(buf, "%u\n", value);
1102 }
1103
1104 static ssize_t bql_set(const char *buf, const size_t count,
1105                        unsigned int *pvalue)
1106 {
1107         unsigned int value;
1108         int err;
1109
1110         if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1111                 value = DQL_MAX_LIMIT;
1112         } else {
1113                 err = kstrtouint(buf, 10, &value);
1114                 if (err < 0)
1115                         return err;
1116                 if (value > DQL_MAX_LIMIT)
1117                         return -EINVAL;
1118         }
1119
1120         *pvalue = value;
1121
1122         return count;
1123 }
1124
1125 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1126                                   char *buf)
1127 {
1128         struct dql *dql = &queue->dql;
1129
1130         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1131 }
1132
1133 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1134                                  const char *buf, size_t len)
1135 {
1136         struct dql *dql = &queue->dql;
1137         unsigned int value;
1138         int err;
1139
1140         err = kstrtouint(buf, 10, &value);
1141         if (err < 0)
1142                 return err;
1143
1144         dql->slack_hold_time = msecs_to_jiffies(value);
1145
1146         return len;
1147 }
1148
1149 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1150         = __ATTR(hold_time, S_IRUGO | S_IWUSR,
1151                  bql_show_hold_time, bql_set_hold_time);
1152
1153 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1154                                  char *buf)
1155 {
1156         struct dql *dql = &queue->dql;
1157
1158         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1159 }
1160
1161 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1162         __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1163
1164 #define BQL_ATTR(NAME, FIELD)                                           \
1165 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1166                                  char *buf)                             \
1167 {                                                                       \
1168         return bql_show(buf, queue->dql.FIELD);                         \
1169 }                                                                       \
1170                                                                         \
1171 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1172                                 const char *buf, size_t len)            \
1173 {                                                                       \
1174         return bql_set(buf, len, &queue->dql.FIELD);                    \
1175 }                                                                       \
1176                                                                         \
1177 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1178         = __ATTR(NAME, S_IRUGO | S_IWUSR,                               \
1179                  bql_show_ ## NAME, bql_set_ ## NAME)
1180
1181 BQL_ATTR(limit, limit);
1182 BQL_ATTR(limit_max, max_limit);
1183 BQL_ATTR(limit_min, min_limit);
1184
1185 static struct attribute *dql_attrs[] __ro_after_init = {
1186         &bql_limit_attribute.attr,
1187         &bql_limit_max_attribute.attr,
1188         &bql_limit_min_attribute.attr,
1189         &bql_hold_time_attribute.attr,
1190         &bql_inflight_attribute.attr,
1191         NULL
1192 };
1193
1194 static const struct attribute_group dql_group = {
1195         .name  = "byte_queue_limits",
1196         .attrs  = dql_attrs,
1197 };
1198 #endif /* CONFIG_BQL */
1199
1200 #ifdef CONFIG_XPS
1201 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1202                              char *buf)
1203 {
1204         struct net_device *dev = queue->dev;
1205         int cpu, len, num_tc = 1, tc = 0;
1206         struct xps_dev_maps *dev_maps;
1207         cpumask_var_t mask;
1208         unsigned long index;
1209
1210         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1211                 return -ENOMEM;
1212
1213         index = get_netdev_queue_index(queue);
1214
1215         if (dev->num_tc) {
1216                 num_tc = dev->num_tc;
1217                 tc = netdev_txq_to_tc(dev, index);
1218                 if (tc < 0)
1219                         return -EINVAL;
1220         }
1221
1222         rcu_read_lock();
1223         dev_maps = rcu_dereference(dev->xps_maps);
1224         if (dev_maps) {
1225                 for_each_possible_cpu(cpu) {
1226                         int i, tci = cpu * num_tc + tc;
1227                         struct xps_map *map;
1228
1229                         map = rcu_dereference(dev_maps->cpu_map[tci]);
1230                         if (!map)
1231                                 continue;
1232
1233                         for (i = map->len; i--;) {
1234                                 if (map->queues[i] == index) {
1235                                         cpumask_set_cpu(cpu, mask);
1236                                         break;
1237                                 }
1238                         }
1239                 }
1240         }
1241         rcu_read_unlock();
1242
1243         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1244         free_cpumask_var(mask);
1245         return len < PAGE_SIZE ? len : -EINVAL;
1246 }
1247
1248 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1249                               const char *buf, size_t len)
1250 {
1251         struct net_device *dev = queue->dev;
1252         unsigned long index;
1253         cpumask_var_t mask;
1254         int err;
1255
1256         if (!capable(CAP_NET_ADMIN))
1257                 return -EPERM;
1258
1259         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1260                 return -ENOMEM;
1261
1262         index = get_netdev_queue_index(queue);
1263
1264         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1265         if (err) {
1266                 free_cpumask_var(mask);
1267                 return err;
1268         }
1269
1270         err = netif_set_xps_queue(dev, mask, index);
1271
1272         free_cpumask_var(mask);
1273
1274         return err ? : len;
1275 }
1276
1277 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1278         = __ATTR_RW(xps_cpus);
1279 #endif /* CONFIG_XPS */
1280
1281 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1282         &queue_trans_timeout.attr,
1283         &queue_traffic_class.attr,
1284 #ifdef CONFIG_XPS
1285         &xps_cpus_attribute.attr,
1286         &queue_tx_maxrate.attr,
1287 #endif
1288         NULL
1289 };
1290
1291 static void netdev_queue_release(struct kobject *kobj)
1292 {
1293         struct netdev_queue *queue = to_netdev_queue(kobj);
1294
1295         memset(kobj, 0, sizeof(*kobj));
1296         dev_put(queue->dev);
1297 }
1298
1299 static const void *netdev_queue_namespace(struct kobject *kobj)
1300 {
1301         struct netdev_queue *queue = to_netdev_queue(kobj);
1302         struct device *dev = &queue->dev->dev;
1303         const void *ns = NULL;
1304
1305         if (dev->class && dev->class->ns_type)
1306                 ns = dev->class->namespace(dev);
1307
1308         return ns;
1309 }
1310
1311 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1312         .sysfs_ops = &netdev_queue_sysfs_ops,
1313         .release = netdev_queue_release,
1314         .default_attrs = netdev_queue_default_attrs,
1315         .namespace = netdev_queue_namespace,
1316 };
1317
1318 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1319 {
1320         struct netdev_queue *queue = dev->_tx + index;
1321         struct kobject *kobj = &queue->kobj;
1322         int error = 0;
1323
1324         kobj->kset = dev->queues_kset;
1325         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1326                                      "tx-%u", index);
1327         if (error)
1328                 return error;
1329
1330 #ifdef CONFIG_BQL
1331         error = sysfs_create_group(kobj, &dql_group);
1332         if (error) {
1333                 kobject_put(kobj);
1334                 return error;
1335         }
1336 #endif
1337
1338         kobject_uevent(kobj, KOBJ_ADD);
1339         dev_hold(queue->dev);
1340
1341         return 0;
1342 }
1343 #endif /* CONFIG_SYSFS */
1344
1345 int
1346 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1347 {
1348 #ifdef CONFIG_SYSFS
1349         int i;
1350         int error = 0;
1351
1352         for (i = old_num; i < new_num; i++) {
1353                 error = netdev_queue_add_kobject(dev, i);
1354                 if (error) {
1355                         new_num = old_num;
1356                         break;
1357                 }
1358         }
1359
1360         while (--i >= new_num) {
1361                 struct netdev_queue *queue = dev->_tx + i;
1362
1363                 if (!atomic_read(&dev_net(dev)->count))
1364                         queue->kobj.uevent_suppress = 1;
1365 #ifdef CONFIG_BQL
1366                 sysfs_remove_group(&queue->kobj, &dql_group);
1367 #endif
1368                 kobject_put(&queue->kobj);
1369         }
1370
1371         return error;
1372 #else
1373         return 0;
1374 #endif /* CONFIG_SYSFS */
1375 }
1376
1377 static int register_queue_kobjects(struct net_device *dev)
1378 {
1379         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1380
1381 #ifdef CONFIG_SYSFS
1382         dev->queues_kset = kset_create_and_add("queues",
1383                                                NULL, &dev->dev.kobj);
1384         if (!dev->queues_kset)
1385                 return -ENOMEM;
1386         real_rx = dev->real_num_rx_queues;
1387 #endif
1388         real_tx = dev->real_num_tx_queues;
1389
1390         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1391         if (error)
1392                 goto error;
1393         rxq = real_rx;
1394
1395         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1396         if (error)
1397                 goto error;
1398         txq = real_tx;
1399
1400         return 0;
1401
1402 error:
1403         netdev_queue_update_kobjects(dev, txq, 0);
1404         net_rx_queue_update_kobjects(dev, rxq, 0);
1405         return error;
1406 }
1407
1408 static void remove_queue_kobjects(struct net_device *dev)
1409 {
1410         int real_rx = 0, real_tx = 0;
1411
1412 #ifdef CONFIG_SYSFS
1413         real_rx = dev->real_num_rx_queues;
1414 #endif
1415         real_tx = dev->real_num_tx_queues;
1416
1417         net_rx_queue_update_kobjects(dev, real_rx, 0);
1418         netdev_queue_update_kobjects(dev, real_tx, 0);
1419 #ifdef CONFIG_SYSFS
1420         kset_unregister(dev->queues_kset);
1421 #endif
1422 }
1423
1424 static bool net_current_may_mount(void)
1425 {
1426         struct net *net = current->nsproxy->net_ns;
1427
1428         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1429 }
1430
1431 static void *net_grab_current_ns(void)
1432 {
1433         struct net *ns = current->nsproxy->net_ns;
1434 #ifdef CONFIG_NET_NS
1435         if (ns)
1436                 refcount_inc(&ns->passive);
1437 #endif
1438         return ns;
1439 }
1440
1441 static const void *net_initial_ns(void)
1442 {
1443         return &init_net;
1444 }
1445
1446 static const void *net_netlink_ns(struct sock *sk)
1447 {
1448         return sock_net(sk);
1449 }
1450
1451 const struct kobj_ns_type_operations net_ns_type_operations = {
1452         .type = KOBJ_NS_TYPE_NET,
1453         .current_may_mount = net_current_may_mount,
1454         .grab_current_ns = net_grab_current_ns,
1455         .netlink_ns = net_netlink_ns,
1456         .initial_ns = net_initial_ns,
1457         .drop_ns = net_drop_ns,
1458 };
1459 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1460
1461 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1462 {
1463         struct net_device *dev = to_net_dev(d);
1464         int retval;
1465
1466         /* pass interface to uevent. */
1467         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1468         if (retval)
1469                 goto exit;
1470
1471         /* pass ifindex to uevent.
1472          * ifindex is useful as it won't change (interface name may change)
1473          * and is what RtNetlink uses natively.
1474          */
1475         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1476
1477 exit:
1478         return retval;
1479 }
1480
1481 /*
1482  *      netdev_release -- destroy and free a dead device.
1483  *      Called when last reference to device kobject is gone.
1484  */
1485 static void netdev_release(struct device *d)
1486 {
1487         struct net_device *dev = to_net_dev(d);
1488
1489         BUG_ON(dev->reg_state != NETREG_RELEASED);
1490
1491         kfree(dev->ifalias);
1492         netdev_freemem(dev);
1493 }
1494
1495 static const void *net_namespace(struct device *d)
1496 {
1497         struct net_device *dev = to_net_dev(d);
1498
1499         return dev_net(dev);
1500 }
1501
1502 static struct class net_class __ro_after_init = {
1503         .name = "net",
1504         .dev_release = netdev_release,
1505         .dev_groups = net_class_groups,
1506         .dev_uevent = netdev_uevent,
1507         .ns_type = &net_ns_type_operations,
1508         .namespace = net_namespace,
1509 };
1510
1511 #ifdef CONFIG_OF_NET
1512 static int of_dev_node_match(struct device *dev, const void *data)
1513 {
1514         int ret = 0;
1515
1516         if (dev->parent)
1517                 ret = dev->parent->of_node == data;
1518
1519         return ret == 0 ? dev->of_node == data : ret;
1520 }
1521
1522 /*
1523  * of_find_net_device_by_node - lookup the net device for the device node
1524  * @np: OF device node
1525  *
1526  * Looks up the net_device structure corresponding with the device node.
1527  * If successful, returns a pointer to the net_device with the embedded
1528  * struct device refcount incremented by one, or NULL on failure. The
1529  * refcount must be dropped when done with the net_device.
1530  */
1531 struct net_device *of_find_net_device_by_node(struct device_node *np)
1532 {
1533         struct device *dev;
1534
1535         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1536         if (!dev)
1537                 return NULL;
1538
1539         return to_net_dev(dev);
1540 }
1541 EXPORT_SYMBOL(of_find_net_device_by_node);
1542 #endif
1543
1544 /* Delete sysfs entries but hold kobject reference until after all
1545  * netdev references are gone.
1546  */
1547 void netdev_unregister_kobject(struct net_device *ndev)
1548 {
1549         struct device *dev = &ndev->dev;
1550
1551         if (!atomic_read(&dev_net(ndev)->count))
1552                 dev_set_uevent_suppress(dev, 1);
1553
1554         kobject_get(&dev->kobj);
1555
1556         remove_queue_kobjects(ndev);
1557
1558         pm_runtime_set_memalloc_noio(dev, false);
1559
1560         device_del(dev);
1561 }
1562
1563 /* Create sysfs entries for network device. */
1564 int netdev_register_kobject(struct net_device *ndev)
1565 {
1566         struct device *dev = &ndev->dev;
1567         const struct attribute_group **groups = ndev->sysfs_groups;
1568         int error = 0;
1569
1570         device_initialize(dev);
1571         dev->class = &net_class;
1572         dev->platform_data = ndev;
1573         dev->groups = groups;
1574
1575         dev_set_name(dev, "%s", ndev->name);
1576
1577 #ifdef CONFIG_SYSFS
1578         /* Allow for a device specific group */
1579         if (*groups)
1580                 groups++;
1581
1582         *groups++ = &netstat_group;
1583
1584 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1585         if (ndev->ieee80211_ptr)
1586                 *groups++ = &wireless_group;
1587 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1588         else if (ndev->wireless_handlers)
1589                 *groups++ = &wireless_group;
1590 #endif
1591 #endif
1592 #endif /* CONFIG_SYSFS */
1593
1594         error = device_add(dev);
1595         if (error)
1596                 return error;
1597
1598         error = register_queue_kobjects(ndev);
1599         if (error) {
1600                 device_del(dev);
1601                 return error;
1602         }
1603
1604         pm_runtime_set_memalloc_noio(dev, true);
1605
1606         return error;
1607 }
1608
1609 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1610                                 const void *ns)
1611 {
1612         return class_create_file_ns(&net_class, class_attr, ns);
1613 }
1614 EXPORT_SYMBOL(netdev_class_create_file_ns);
1615
1616 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1617                                  const void *ns)
1618 {
1619         class_remove_file_ns(&net_class, class_attr, ns);
1620 }
1621 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1622
1623 int __init netdev_kobject_init(void)
1624 {
1625         kobj_ns_type_register(&net_ns_type_operations);
1626         return class_register(&net_class);
1627 }