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_up_count) +
 299                        atomic_read(&netdev->carrier_down_count));
 300 }
 301 static DEVICE_ATTR_RO(carrier_changes);
 302
 303 static ssize_t carrier_up_count_show(struct device *dev,
 304                                      struct device_attribute *attr,
 305                                      char *buf)
 306 {
 307         struct net_device *netdev = to_net_dev(dev);
 308
 309         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
 310 }
 311 static DEVICE_ATTR_RO(carrier_up_count);
 312
 313 static ssize_t carrier_down_count_show(struct device *dev,
 314                                        struct device_attribute *attr,
 315                                        char *buf)
 316 {
 317         struct net_device *netdev = to_net_dev(dev);
 318
 319         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
 320 }
 321 static DEVICE_ATTR_RO(carrier_down_count);
 322
 323 /* read-write attributes */
 324
 325 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 326 {
 327         return dev_set_mtu(dev, (int)new_mtu);
 328 }
 329
 330 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 331                          const char *buf, size_t len)
 332 {
 333         return netdev_store(dev, attr, buf, len, change_mtu);
 334 }
 335 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 336
 337 static int change_flags(struct net_device *dev, unsigned long new_flags)
 338 {
 339         return dev_change_flags(dev, (unsigned int)new_flags);
 340 }
 341
 342 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 343                            const char *buf, size_t len)
 344 {
 345         return netdev_store(dev, attr, buf, len, change_flags);
 346 }
 347 NETDEVICE_SHOW_RW(flags, fmt_hex);
 348
 349 static ssize_t tx_queue_len_store(struct device *dev,
 350                                   struct device_attribute *attr,
 351                                   const char *buf, size_t len)
 352 {
 353         if (!capable(CAP_NET_ADMIN))
 354                 return -EPERM;
 355
 356         return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
 357 }
 358 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
 359
 360 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 361 {
 362         dev->gro_flush_timeout = val;
 363         return 0;
 364 }
 365
 366 static ssize_t gro_flush_timeout_store(struct device *dev,
 367                                        struct device_attribute *attr,
 368                                        const char *buf, size_t len)
 369 {
 370         if (!capable(CAP_NET_ADMIN))
 371                 return -EPERM;
 372
 373         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 374 }
 375 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 376
 377 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 378                              const char *buf, size_t len)
 379 {
 380         struct net_device *netdev = to_net_dev(dev);
 381         struct net *net = dev_net(netdev);
 382         size_t count = len;
 383         ssize_t ret = 0;
 384
 385         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 386                 return -EPERM;
 387
 388         /* ignore trailing newline */
 389         if (len >  0 && buf[len - 1] == '\n')
 390                 --count;
 391
 392         if (!rtnl_trylock())
 393                 return restart_syscall();
 394
 395         if (dev_isalive(netdev)) {
 396                 ret = dev_set_alias(netdev, buf, count);
 397                 if (ret < 0)
 398                         goto err;
 399                 ret = len;
 400                 netdev_state_change(netdev);
 401         }
 402 err:
 403         rtnl_unlock();
 404
 405         return ret;
 406 }
 407
 408 static ssize_t ifalias_show(struct device *dev,
 409                             struct device_attribute *attr, char *buf)
 410 {
 411         const struct net_device *netdev = to_net_dev(dev);
 412         char tmp[IFALIASZ];
 413         ssize_t ret = 0;
 414
 415         ret = dev_get_alias(netdev, tmp, sizeof(tmp));
 416         if (ret > 0)
 417                 ret = sprintf(buf, "%s\n", tmp);
 418         return ret;
 419 }
 420 static DEVICE_ATTR_RW(ifalias);
 421
 422 static int change_group(struct net_device *dev, unsigned long new_group)
 423 {
 424         dev_set_group(dev, (int)new_group);
 425         return 0;
 426 }
 427
 428 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 429                            const char *buf, size_t len)
 430 {
 431         return netdev_store(dev, attr, buf, len, change_group);
 432 }
 433 NETDEVICE_SHOW(group, fmt_dec);
 434 static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
 435
 436 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 437 {
 438         return dev_change_proto_down(dev, (bool)proto_down);
 439 }
 440
 441 static ssize_t proto_down_store(struct device *dev,
 442                                 struct device_attribute *attr,
 443                                 const char *buf, size_t len)
 444 {
 445         return netdev_store(dev, attr, buf, len, change_proto_down);
 446 }
 447 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 448
 449 static ssize_t phys_port_id_show(struct device *dev,
 450                                  struct device_attribute *attr, char *buf)
 451 {
 452         struct net_device *netdev = to_net_dev(dev);
 453         ssize_t ret = -EINVAL;
 454
 455         if (!rtnl_trylock())
 456                 return restart_syscall();
 457
 458         if (dev_isalive(netdev)) {
 459                 struct netdev_phys_item_id ppid;
 460
 461                 ret = dev_get_phys_port_id(netdev, &ppid);
 462                 if (!ret)
 463                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 464         }
 465         rtnl_unlock();
 466
 467         return ret;
 468 }
 469 static DEVICE_ATTR_RO(phys_port_id);
 470
 471 static ssize_t phys_port_name_show(struct device *dev,
 472                                    struct device_attribute *attr, char *buf)
 473 {
 474         struct net_device *netdev = to_net_dev(dev);
 475         ssize_t ret = -EINVAL;
 476
 477         if (!rtnl_trylock())
 478                 return restart_syscall();
 479
 480         if (dev_isalive(netdev)) {
 481                 char name[IFNAMSIZ];
 482
 483                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 484                 if (!ret)
 485                         ret = sprintf(buf, "%s\n", name);
 486         }
 487         rtnl_unlock();
 488
 489         return ret;
 490 }
 491 static DEVICE_ATTR_RO(phys_port_name);
 492
 493 static ssize_t phys_switch_id_show(struct device *dev,
 494                                    struct device_attribute *attr, char *buf)
 495 {
 496         struct net_device *netdev = to_net_dev(dev);
 497         ssize_t ret = -EINVAL;
 498
 499         if (!rtnl_trylock())
 500                 return restart_syscall();
 501
 502         if (dev_isalive(netdev)) {
 503                 struct switchdev_attr attr = {
 504                         .orig_dev = netdev,
 505                         .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
 506                         .flags = SWITCHDEV_F_NO_RECURSE,
 507                 };
 508
 509                 ret = switchdev_port_attr_get(netdev, &attr);
 510                 if (!ret)
 511                         ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
 512                                       attr.u.ppid.id);
 513         }
 514         rtnl_unlock();
 515
 516         return ret;
 517 }
 518 static DEVICE_ATTR_RO(phys_switch_id);
 519
 520 static struct attribute *net_class_attrs[] __ro_after_init = {
 521         &dev_attr_netdev_group.attr,
 522         &dev_attr_type.attr,
 523         &dev_attr_dev_id.attr,
 524         &dev_attr_dev_port.attr,
 525         &dev_attr_iflink.attr,
 526         &dev_attr_ifindex.attr,
 527         &dev_attr_name_assign_type.attr,
 528         &dev_attr_addr_assign_type.attr,
 529         &dev_attr_addr_len.attr,
 530         &dev_attr_link_mode.attr,
 531         &dev_attr_address.attr,
 532         &dev_attr_broadcast.attr,
 533         &dev_attr_speed.attr,
 534         &dev_attr_duplex.attr,
 535         &dev_attr_dormant.attr,
 536         &dev_attr_operstate.attr,
 537         &dev_attr_carrier_changes.attr,
 538         &dev_attr_ifalias.attr,
 539         &dev_attr_carrier.attr,
 540         &dev_attr_mtu.attr,
 541         &dev_attr_flags.attr,
 542         &dev_attr_tx_queue_len.attr,
 543         &dev_attr_gro_flush_timeout.attr,
 544         &dev_attr_phys_port_id.attr,
 545         &dev_attr_phys_port_name.attr,
 546         &dev_attr_phys_switch_id.attr,
 547         &dev_attr_proto_down.attr,
 548         &dev_attr_carrier_up_count.attr,
 549         &dev_attr_carrier_down_count.attr,
 550         NULL,
 551 };
 552 ATTRIBUTE_GROUPS(net_class);
 553
 554 /* Show a given an attribute in the statistics group */
 555 static ssize_t netstat_show(const struct device *d,
 556                             struct device_attribute *attr, char *buf,
 557                             unsigned long offset)
 558 {
 559         struct net_device *dev = to_net_dev(d);
 560         ssize_t ret = -EINVAL;
 561
 562         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 563                 offset % sizeof(u64) != 0);
 564
 565         read_lock(&dev_base_lock);
 566         if (dev_isalive(dev)) {
 567                 struct rtnl_link_stats64 temp;
 568                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 569
 570                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
 571         }
 572         read_unlock(&dev_base_lock);
 573         return ret;
 574 }
 575
 576 /* generate a read-only statistics attribute */
 577 #define NETSTAT_ENTRY(name)                                             \
 578 static ssize_t name##_show(struct device *d,                            \
 579                            struct device_attribute *attr, char *buf)    \
 580 {                                                                       \
 581         return netstat_show(d, attr, buf,                               \
 582                             offsetof(struct rtnl_link_stats64, name));  \
 583 }                                                                       \
 584 static DEVICE_ATTR_RO(name)
 585
 586 NETSTAT_ENTRY(rx_packets);
 587 NETSTAT_ENTRY(tx_packets);
 588 NETSTAT_ENTRY(rx_bytes);
 589 NETSTAT_ENTRY(tx_bytes);
 590 NETSTAT_ENTRY(rx_errors);
 591 NETSTAT_ENTRY(tx_errors);
 592 NETSTAT_ENTRY(rx_dropped);
 593 NETSTAT_ENTRY(tx_dropped);
 594 NETSTAT_ENTRY(multicast);
 595 NETSTAT_ENTRY(collisions);
 596 NETSTAT_ENTRY(rx_length_errors);
 597 NETSTAT_ENTRY(rx_over_errors);
 598 NETSTAT_ENTRY(rx_crc_errors);
 599 NETSTAT_ENTRY(rx_frame_errors);
 600 NETSTAT_ENTRY(rx_fifo_errors);
 601 NETSTAT_ENTRY(rx_missed_errors);
 602 NETSTAT_ENTRY(tx_aborted_errors);
 603 NETSTAT_ENTRY(tx_carrier_errors);
 604 NETSTAT_ENTRY(tx_fifo_errors);
 605 NETSTAT_ENTRY(tx_heartbeat_errors);
 606 NETSTAT_ENTRY(tx_window_errors);
 607 NETSTAT_ENTRY(rx_compressed);
 608 NETSTAT_ENTRY(tx_compressed);
 609 NETSTAT_ENTRY(rx_nohandler);
 610
 611 static struct attribute *netstat_attrs[] __ro_after_init = {
 612         &dev_attr_rx_packets.attr,
 613         &dev_attr_tx_packets.attr,
 614         &dev_attr_rx_bytes.attr,
 615         &dev_attr_tx_bytes.attr,
 616         &dev_attr_rx_errors.attr,
 617         &dev_attr_tx_errors.attr,
 618         &dev_attr_rx_dropped.attr,
 619         &dev_attr_tx_dropped.attr,
 620         &dev_attr_multicast.attr,
 621         &dev_attr_collisions.attr,
 622         &dev_attr_rx_length_errors.attr,
 623         &dev_attr_rx_over_errors.attr,
 624         &dev_attr_rx_crc_errors.attr,
 625         &dev_attr_rx_frame_errors.attr,
 626         &dev_attr_rx_fifo_errors.attr,
 627         &dev_attr_rx_missed_errors.attr,
 628         &dev_attr_tx_aborted_errors.attr,
 629         &dev_attr_tx_carrier_errors.attr,
 630         &dev_attr_tx_fifo_errors.attr,
 631         &dev_attr_tx_heartbeat_errors.attr,
 632         &dev_attr_tx_window_errors.attr,
 633         &dev_attr_rx_compressed.attr,
 634         &dev_attr_tx_compressed.attr,
 635         &dev_attr_rx_nohandler.attr,
 636         NULL
 637 };
 638
 639 static const struct attribute_group netstat_group = {
 640         .name  = "statistics",
 641         .attrs  = netstat_attrs,
 642 };
 643
 644 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 645 static struct attribute *wireless_attrs[] = {
 646         NULL
 647 };
 648
 649 static const struct attribute_group wireless_group = {
 650         .name = "wireless",
 651         .attrs = wireless_attrs,
 652 };
 653 #endif
 654
 655 #else /* CONFIG_SYSFS */
 656 #define net_class_groups        NULL
 657 #endif /* CONFIG_SYSFS */
 658
 659 #ifdef CONFIG_SYSFS
 660 #define to_rx_queue_attr(_attr) \
 661         container_of(_attr, struct rx_queue_attribute, attr)
 662
 663 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 664
 665 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 666                                   char *buf)
 667 {
 668         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 669         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 670
 671         if (!attribute->show)
 672                 return -EIO;
 673
 674         return attribute->show(queue, buf);
 675 }
 676
 677 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 678                                    const char *buf, size_t count)
 679 {
 680         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 681         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 682
 683         if (!attribute->store)
 684                 return -EIO;
 685
 686         return attribute->store(queue, buf, count);
 687 }
 688
 689 static const struct sysfs_ops rx_queue_sysfs_ops = {
 690         .show = rx_queue_attr_show,
 691         .store = rx_queue_attr_store,
 692 };
 693
 694 #ifdef CONFIG_RPS
 695 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
 696 {
 697         struct rps_map *map;
 698         cpumask_var_t mask;
 699         int i, len;
 700
 701         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 702                 return -ENOMEM;
 703
 704         rcu_read_lock();
 705         map = rcu_dereference(queue->rps_map);
 706         if (map)
 707                 for (i = 0; i < map->len; i++)
 708                         cpumask_set_cpu(map->cpus[i], mask);
 709
 710         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 711         rcu_read_unlock();
 712         free_cpumask_var(mask);
 713
 714         return len < PAGE_SIZE ? len : -EINVAL;
 715 }
 716
 717 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 718                              const char *buf, size_t len)
 719 {
 720         struct rps_map *old_map, *map;
 721         cpumask_var_t mask;
 722         int err, cpu, i;
 723         static DEFINE_MUTEX(rps_map_mutex);
 724
 725         if (!capable(CAP_NET_ADMIN))
 726                 return -EPERM;
 727
 728         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 729                 return -ENOMEM;
 730
 731         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 732         if (err) {
 733                 free_cpumask_var(mask);
 734                 return err;
 735         }
 736
 737         map = kzalloc(max_t(unsigned int,
 738                             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 739                       GFP_KERNEL);
 740         if (!map) {
 741                 free_cpumask_var(mask);
 742                 return -ENOMEM;
 743         }
 744
 745         i = 0;
 746         for_each_cpu_and(cpu, mask, cpu_online_mask)
 747                 map->cpus[i++] = cpu;
 748
 749         if (i) {
 750                 map->len = i;
 751         } else {
 752                 kfree(map);
 753                 map = NULL;
 754         }
 755
 756         mutex_lock(&rps_map_mutex);
 757         old_map = rcu_dereference_protected(queue->rps_map,
 758                                             mutex_is_locked(&rps_map_mutex));
 759         rcu_assign_pointer(queue->rps_map, map);
 760
 761         if (map)
 762                 static_key_slow_inc(&rps_needed);
 763         if (old_map)
 764                 static_key_slow_dec(&rps_needed);
 765
 766         mutex_unlock(&rps_map_mutex);
 767
 768         if (old_map)
 769                 kfree_rcu(old_map, rcu);
 770
 771         free_cpumask_var(mask);
 772         return len;
 773 }
 774
 775 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 776                                            char *buf)
 777 {
 778         struct rps_dev_flow_table *flow_table;
 779         unsigned long val = 0;
 780
 781         rcu_read_lock();
 782         flow_table = rcu_dereference(queue->rps_flow_table);
 783         if (flow_table)
 784                 val = (unsigned long)flow_table->mask + 1;
 785         rcu_read_unlock();
 786
 787         return sprintf(buf, "%lu\n", val);
 788 }
 789
 790 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 791 {
 792         struct rps_dev_flow_table *table = container_of(rcu,
 793             struct rps_dev_flow_table, rcu);
 794         vfree(table);
 795 }
 796
 797 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 798                                             const char *buf, size_t len)
 799 {
 800         unsigned long mask, count;
 801         struct rps_dev_flow_table *table, *old_table;
 802         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 803         int rc;
 804
 805         if (!capable(CAP_NET_ADMIN))
 806                 return -EPERM;
 807
 808         rc = kstrtoul(buf, 0, &count);
 809         if (rc < 0)
 810                 return rc;
 811
 812         if (count) {
 813                 mask = count - 1;
 814                 /* mask = roundup_pow_of_two(count) - 1;
 815                  * without overflows...
 816                  */
 817                 while ((mask | (mask >> 1)) != mask)
 818                         mask |= (mask >> 1);
 819                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 820                  * and on 32bit arches, must check
 821                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 822                  */
 823 #if BITS_PER_LONG > 32
 824                 if (mask > (unsigned long)(u32)mask)
 825                         return -EINVAL;
 826 #else
 827                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 828                                 / sizeof(struct rps_dev_flow)) {
 829                         /* Enforce a limit to prevent overflow */
 830                         return -EINVAL;
 831                 }
 832 #endif
 833                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 834                 if (!table)
 835                         return -ENOMEM;
 836
 837                 table->mask = mask;
 838                 for (count = 0; count <= mask; count++)
 839                         table->flows[count].cpu = RPS_NO_CPU;
 840         } else {
 841                 table = NULL;
 842         }
 843
 844         spin_lock(&rps_dev_flow_lock);
 845         old_table = rcu_dereference_protected(queue->rps_flow_table,
 846                                               lockdep_is_held(&rps_dev_flow_lock));
 847         rcu_assign_pointer(queue->rps_flow_table, table);
 848         spin_unlock(&rps_dev_flow_lock);
 849
 850         if (old_table)
 851                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 852
 853         return len;
 854 }
 855
 856 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
 857         = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
 858
 859 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
 860         = __ATTR(rps_flow_cnt, 0644,
 861                  show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 862 #endif /* CONFIG_RPS */
 863
 864 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
 865 #ifdef CONFIG_RPS
 866         &rps_cpus_attribute.attr,
 867         &rps_dev_flow_table_cnt_attribute.attr,
 868 #endif
 869         NULL
 870 };
 871
 872 static void rx_queue_release(struct kobject *kobj)
 873 {
 874         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 875 #ifdef CONFIG_RPS
 876         struct rps_map *map;
 877         struct rps_dev_flow_table *flow_table;
 878
 879         map = rcu_dereference_protected(queue->rps_map, 1);
 880         if (map) {
 881                 RCU_INIT_POINTER(queue->rps_map, NULL);
 882                 kfree_rcu(map, rcu);
 883         }
 884
 885         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 886         if (flow_table) {
 887                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 888                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 889         }
 890 #endif
 891
 892         memset(kobj, 0, sizeof(*kobj));
 893         dev_put(queue->dev);
 894 }
 895
 896 static const void *rx_queue_namespace(struct kobject *kobj)
 897 {
 898         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 899         struct device *dev = &queue->dev->dev;
 900         const void *ns = NULL;
 901
 902         if (dev->class && dev->class->ns_type)
 903                 ns = dev->class->namespace(dev);
 904
 905         return ns;
 906 }
 907
 908 static struct kobj_type rx_queue_ktype __ro_after_init = {
 909         .sysfs_ops = &rx_queue_sysfs_ops,
 910         .release = rx_queue_release,
 911         .default_attrs = rx_queue_default_attrs,
 912         .namespace = rx_queue_namespace
 913 };
 914
 915 static int rx_queue_add_kobject(struct net_device *dev, int index)
 916 {
 917         struct netdev_rx_queue *queue = dev->_rx + index;
 918         struct kobject *kobj = &queue->kobj;
 919         int error = 0;
 920
 921         kobj->kset = dev->queues_kset;
 922         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 923                                      "rx-%u", index);
 924         if (error)
 925                 return error;
 926
 927         if (dev->sysfs_rx_queue_group) {
 928                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
 929                 if (error) {
 930                         kobject_put(kobj);
 931                         return error;
 932                 }
 933         }
 934
 935         kobject_uevent(kobj, KOBJ_ADD);
 936         dev_hold(queue->dev);
 937
 938         return error;
 939 }
 940 #endif /* CONFIG_SYSFS */
 941
 942 int
 943 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
 944 {
 945 #ifdef CONFIG_SYSFS
 946         int i;
 947         int error = 0;
 948
 949 #ifndef CONFIG_RPS
 950         if (!dev->sysfs_rx_queue_group)
 951                 return 0;
 952 #endif
 953         for (i = old_num; i < new_num; i++) {
 954                 error = rx_queue_add_kobject(dev, i);
 955                 if (error) {
 956                         new_num = old_num;
 957                         break;
 958                 }
 959         }
 960
 961         while (--i >= new_num) {
 962                 struct kobject *kobj = &dev->_rx[i].kobj;
 963
 964                 if (!refcount_read(&dev_net(dev)->count))
 965                         kobj->uevent_suppress = 1;
 966                 if (dev->sysfs_rx_queue_group)
 967                         sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
 968                 kobject_put(kobj);
 969         }
 970
 971         return error;
 972 #else
 973         return 0;
 974 #endif
 975 }
 976
 977 #ifdef CONFIG_SYSFS
 978 /*
 979  * netdev_queue sysfs structures and functions.
 980  */
 981 struct netdev_queue_attribute {
 982         struct attribute attr;
 983         ssize_t (*show)(struct netdev_queue *queue, char *buf);
 984         ssize_t (*store)(struct netdev_queue *queue,
 985                          const char *buf, size_t len);
 986 };
 987 #define to_netdev_queue_attr(_attr) \
 988         container_of(_attr, struct netdev_queue_attribute, attr)
 989
 990 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 991
 992 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 993                                       struct attribute *attr, char *buf)
 994 {
 995         const struct netdev_queue_attribute *attribute
 996                 = to_netdev_queue_attr(attr);
 997         struct netdev_queue *queue = to_netdev_queue(kobj);
 998
 999         if (!attribute->show)
1000                 return -EIO;
1001
1002         return attribute->show(queue, buf);
1003 }
1004
1005 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1006                                        struct attribute *attr,
1007                                        const char *buf, size_t count)
1008 {
1009         const struct netdev_queue_attribute *attribute
1010                 = to_netdev_queue_attr(attr);
1011         struct netdev_queue *queue = to_netdev_queue(kobj);
1012
1013         if (!attribute->store)
1014                 return -EIO;
1015
1016         return attribute->store(queue, buf, count);
1017 }
1018
1019 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1020         .show = netdev_queue_attr_show,
1021         .store = netdev_queue_attr_store,
1022 };
1023
1024 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1025 {
1026         unsigned long trans_timeout;
1027
1028         spin_lock_irq(&queue->_xmit_lock);
1029         trans_timeout = queue->trans_timeout;
1030         spin_unlock_irq(&queue->_xmit_lock);
1031
1032         return sprintf(buf, "%lu", trans_timeout);
1033 }
1034
1035 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1036 {
1037         struct net_device *dev = queue->dev;
1038         unsigned int i;
1039
1040         i = queue - dev->_tx;
1041         BUG_ON(i >= dev->num_tx_queues);
1042
1043         return i;
1044 }
1045
1046 static ssize_t traffic_class_show(struct netdev_queue *queue,
1047                                   char *buf)
1048 {
1049         struct net_device *dev = queue->dev;
1050         int index = get_netdev_queue_index(queue);
1051         int tc = netdev_txq_to_tc(dev, index);
1052
1053         if (tc < 0)
1054                 return -EINVAL;
1055
1056         return sprintf(buf, "%u\n", tc);
1057 }
1058
1059 #ifdef CONFIG_XPS
1060 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1061                                char *buf)
1062 {
1063         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1064 }
1065
1066 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1067                                 const char *buf, size_t len)
1068 {
1069         struct net_device *dev = queue->dev;
1070         int err, index = get_netdev_queue_index(queue);
1071         u32 rate = 0;
1072
1073         err = kstrtou32(buf, 10, &rate);
1074         if (err < 0)
1075                 return err;
1076
1077         if (!rtnl_trylock())
1078                 return restart_syscall();
1079
1080         err = -EOPNOTSUPP;
1081         if (dev->netdev_ops->ndo_set_tx_maxrate)
1082                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1083
1084         rtnl_unlock();
1085         if (!err) {
1086                 queue->tx_maxrate = rate;
1087                 return len;
1088         }
1089         return err;
1090 }
1091
1092 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1093         = __ATTR_RW(tx_maxrate);
1094 #endif
1095
1096 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1097         = __ATTR_RO(tx_timeout);
1098
1099 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1100         = __ATTR_RO(traffic_class);
1101
1102 #ifdef CONFIG_BQL
1103 /*
1104  * Byte queue limits sysfs structures and functions.
1105  */
1106 static ssize_t bql_show(char *buf, unsigned int value)
1107 {
1108         return sprintf(buf, "%u\n", value);
1109 }
1110
1111 static ssize_t bql_set(const char *buf, const size_t count,
1112                        unsigned int *pvalue)
1113 {
1114         unsigned int value;
1115         int err;
1116
1117         if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1118                 value = DQL_MAX_LIMIT;
1119         } else {
1120                 err = kstrtouint(buf, 10, &value);
1121                 if (err < 0)
1122                         return err;
1123                 if (value > DQL_MAX_LIMIT)
1124                         return -EINVAL;
1125         }
1126
1127         *pvalue = value;
1128
1129         return count;
1130 }
1131
1132 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1133                                   char *buf)
1134 {
1135         struct dql *dql = &queue->dql;
1136
1137         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1138 }
1139
1140 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1141                                  const char *buf, size_t len)
1142 {
1143         struct dql *dql = &queue->dql;
1144         unsigned int value;
1145         int err;
1146
1147         err = kstrtouint(buf, 10, &value);
1148         if (err < 0)
1149                 return err;
1150
1151         dql->slack_hold_time = msecs_to_jiffies(value);
1152
1153         return len;
1154 }
1155
1156 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1157         = __ATTR(hold_time, 0644,
1158                  bql_show_hold_time, bql_set_hold_time);
1159
1160 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1161                                  char *buf)
1162 {
1163         struct dql *dql = &queue->dql;
1164
1165         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1166 }
1167
1168 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1169         __ATTR(inflight, 0444, bql_show_inflight, NULL);
1170
1171 #define BQL_ATTR(NAME, FIELD)                                           \
1172 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1173                                  char *buf)                             \
1174 {                                                                       \
1175         return bql_show(buf, queue->dql.FIELD);                         \
1176 }                                                                       \
1177                                                                         \
1178 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1179                                 const char *buf, size_t len)            \
1180 {                                                                       \
1181         return bql_set(buf, len, &queue->dql.FIELD);                    \
1182 }                                                                       \
1183                                                                         \
1184 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1185         = __ATTR(NAME, 0644,                            \
1186                  bql_show_ ## NAME, bql_set_ ## NAME)
1187
1188 BQL_ATTR(limit, limit);
1189 BQL_ATTR(limit_max, max_limit);
1190 BQL_ATTR(limit_min, min_limit);
1191
1192 static struct attribute *dql_attrs[] __ro_after_init = {
1193         &bql_limit_attribute.attr,
1194         &bql_limit_max_attribute.attr,
1195         &bql_limit_min_attribute.attr,
1196         &bql_hold_time_attribute.attr,
1197         &bql_inflight_attribute.attr,
1198         NULL
1199 };
1200
1201 static const struct attribute_group dql_group = {
1202         .name  = "byte_queue_limits",
1203         .attrs  = dql_attrs,
1204 };
1205 #endif /* CONFIG_BQL */
1206
1207 #ifdef CONFIG_XPS
1208 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1209                              char *buf)
1210 {
1211         struct net_device *dev = queue->dev;
1212         int cpu, len, num_tc = 1, tc = 0;
1213         struct xps_dev_maps *dev_maps;
1214         cpumask_var_t mask;
1215         unsigned long index;
1216
1217         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1218                 return -ENOMEM;
1219
1220         index = get_netdev_queue_index(queue);
1221
1222         if (dev->num_tc) {
1223                 num_tc = dev->num_tc;
1224                 tc = netdev_txq_to_tc(dev, index);
1225                 if (tc < 0)
1226                         return -EINVAL;
1227         }
1228
1229         rcu_read_lock();
1230         dev_maps = rcu_dereference(dev->xps_maps);
1231         if (dev_maps) {
1232                 for_each_possible_cpu(cpu) {
1233                         int i, tci = cpu * num_tc + tc;
1234                         struct xps_map *map;
1235
1236                         map = rcu_dereference(dev_maps->cpu_map[tci]);
1237                         if (!map)
1238                                 continue;
1239
1240                         for (i = map->len; i--;) {
1241                                 if (map->queues[i] == index) {
1242                                         cpumask_set_cpu(cpu, mask);
1243                                         break;
1244                                 }
1245                         }
1246                 }
1247         }
1248         rcu_read_unlock();
1249
1250         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1251         free_cpumask_var(mask);
1252         return len < PAGE_SIZE ? len : -EINVAL;
1253 }
1254
1255 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1256                               const char *buf, size_t len)
1257 {
1258         struct net_device *dev = queue->dev;
1259         unsigned long index;
1260         cpumask_var_t mask;
1261         int err;
1262
1263         if (!capable(CAP_NET_ADMIN))
1264                 return -EPERM;
1265
1266         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1267                 return -ENOMEM;
1268
1269         index = get_netdev_queue_index(queue);
1270
1271         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1272         if (err) {
1273                 free_cpumask_var(mask);
1274                 return err;
1275         }
1276
1277         err = netif_set_xps_queue(dev, mask, index);
1278
1279         free_cpumask_var(mask);
1280
1281         return err ? : len;
1282 }
1283
1284 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1285         = __ATTR_RW(xps_cpus);
1286 #endif /* CONFIG_XPS */
1287
1288 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1289         &queue_trans_timeout.attr,
1290         &queue_traffic_class.attr,
1291 #ifdef CONFIG_XPS
1292         &xps_cpus_attribute.attr,
1293         &queue_tx_maxrate.attr,
1294 #endif
1295         NULL
1296 };
1297
1298 static void netdev_queue_release(struct kobject *kobj)
1299 {
1300         struct netdev_queue *queue = to_netdev_queue(kobj);
1301
1302         memset(kobj, 0, sizeof(*kobj));
1303         dev_put(queue->dev);
1304 }
1305
1306 static const void *netdev_queue_namespace(struct kobject *kobj)
1307 {
1308         struct netdev_queue *queue = to_netdev_queue(kobj);
1309         struct device *dev = &queue->dev->dev;
1310         const void *ns = NULL;
1311
1312         if (dev->class && dev->class->ns_type)
1313                 ns = dev->class->namespace(dev);
1314
1315         return ns;
1316 }
1317
1318 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1319         .sysfs_ops = &netdev_queue_sysfs_ops,
1320         .release = netdev_queue_release,
1321         .default_attrs = netdev_queue_default_attrs,
1322         .namespace = netdev_queue_namespace,
1323 };
1324
1325 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1326 {
1327         struct netdev_queue *queue = dev->_tx + index;
1328         struct kobject *kobj = &queue->kobj;
1329         int error = 0;
1330
1331         kobj->kset = dev->queues_kset;
1332         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1333                                      "tx-%u", index);
1334         if (error)
1335                 return error;
1336
1337 #ifdef CONFIG_BQL
1338         error = sysfs_create_group(kobj, &dql_group);
1339         if (error) {
1340                 kobject_put(kobj);
1341                 return error;
1342         }
1343 #endif
1344
1345         kobject_uevent(kobj, KOBJ_ADD);
1346         dev_hold(queue->dev);
1347
1348         return 0;
1349 }
1350 #endif /* CONFIG_SYSFS */
1351
1352 int
1353 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1354 {
1355 #ifdef CONFIG_SYSFS
1356         int i;
1357         int error = 0;
1358
1359         for (i = old_num; i < new_num; i++) {
1360                 error = netdev_queue_add_kobject(dev, i);
1361                 if (error) {
1362                         new_num = old_num;
1363                         break;
1364                 }
1365         }
1366
1367         while (--i >= new_num) {
1368                 struct netdev_queue *queue = dev->_tx + i;
1369
1370                 if (!refcount_read(&dev_net(dev)->count))
1371                         queue->kobj.uevent_suppress = 1;
1372 #ifdef CONFIG_BQL
1373                 sysfs_remove_group(&queue->kobj, &dql_group);
1374 #endif
1375                 kobject_put(&queue->kobj);
1376         }
1377
1378         return error;
1379 #else
1380         return 0;
1381 #endif /* CONFIG_SYSFS */
1382 }
1383
1384 static int register_queue_kobjects(struct net_device *dev)
1385 {
1386         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1387
1388 #ifdef CONFIG_SYSFS
1389         dev->queues_kset = kset_create_and_add("queues",
1390                                                NULL, &dev->dev.kobj);
1391         if (!dev->queues_kset)
1392                 return -ENOMEM;
1393         real_rx = dev->real_num_rx_queues;
1394 #endif
1395         real_tx = dev->real_num_tx_queues;
1396
1397         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1398         if (error)
1399                 goto error;
1400         rxq = real_rx;
1401
1402         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1403         if (error)
1404                 goto error;
1405         txq = real_tx;
1406
1407         return 0;
1408
1409 error:
1410         netdev_queue_update_kobjects(dev, txq, 0);
1411         net_rx_queue_update_kobjects(dev, rxq, 0);
1412         return error;
1413 }
1414
1415 static void remove_queue_kobjects(struct net_device *dev)
1416 {
1417         int real_rx = 0, real_tx = 0;
1418
1419 #ifdef CONFIG_SYSFS
1420         real_rx = dev->real_num_rx_queues;
1421 #endif
1422         real_tx = dev->real_num_tx_queues;
1423
1424         net_rx_queue_update_kobjects(dev, real_rx, 0);
1425         netdev_queue_update_kobjects(dev, real_tx, 0);
1426 #ifdef CONFIG_SYSFS
1427         kset_unregister(dev->queues_kset);
1428 #endif
1429 }
1430
1431 static bool net_current_may_mount(void)
1432 {
1433         struct net *net = current->nsproxy->net_ns;
1434
1435         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1436 }
1437
1438 static void *net_grab_current_ns(void)
1439 {
1440         struct net *ns = current->nsproxy->net_ns;
1441 #ifdef CONFIG_NET_NS
1442         if (ns)
1443                 refcount_inc(&ns->passive);
1444 #endif
1445         return ns;
1446 }
1447
1448 static const void *net_initial_ns(void)
1449 {
1450         return &init_net;
1451 }
1452
1453 static const void *net_netlink_ns(struct sock *sk)
1454 {
1455         return sock_net(sk);
1456 }
1457
1458 const struct kobj_ns_type_operations net_ns_type_operations = {
1459         .type = KOBJ_NS_TYPE_NET,
1460         .current_may_mount = net_current_may_mount,
1461         .grab_current_ns = net_grab_current_ns,
1462         .netlink_ns = net_netlink_ns,
1463         .initial_ns = net_initial_ns,
1464         .drop_ns = net_drop_ns,
1465 };
1466 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1467
1468 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1469 {
1470         struct net_device *dev = to_net_dev(d);
1471         int retval;
1472
1473         /* pass interface to uevent. */
1474         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1475         if (retval)
1476                 goto exit;
1477
1478         /* pass ifindex to uevent.
1479          * ifindex is useful as it won't change (interface name may change)
1480          * and is what RtNetlink uses natively.
1481          */
1482         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1483
1484 exit:
1485         return retval;
1486 }
1487
1488 /*
1489  *      netdev_release -- destroy and free a dead device.
1490  *      Called when last reference to device kobject is gone.
1491  */
1492 static void netdev_release(struct device *d)
1493 {
1494         struct net_device *dev = to_net_dev(d);
1495
1496         BUG_ON(dev->reg_state != NETREG_RELEASED);
1497
1498         /* no need to wait for rcu grace period:
1499          * device is dead and about to be freed.
1500          */
1501         kfree(rcu_access_pointer(dev->ifalias));
1502         netdev_freemem(dev);
1503 }
1504
1505 static const void *net_namespace(struct device *d)
1506 {
1507         struct net_device *dev = to_net_dev(d);
1508
1509         return dev_net(dev);
1510 }
1511
1512 static struct class net_class __ro_after_init = {
1513         .name = "net",
1514         .dev_release = netdev_release,
1515         .dev_groups = net_class_groups,
1516         .dev_uevent = netdev_uevent,
1517         .ns_type = &net_ns_type_operations,
1518         .namespace = net_namespace,
1519 };
1520
1521 #ifdef CONFIG_OF_NET
1522 static int of_dev_node_match(struct device *dev, const void *data)
1523 {
1524         int ret = 0;
1525
1526         if (dev->parent)
1527                 ret = dev->parent->of_node == data;
1528
1529         return ret == 0 ? dev->of_node == data : ret;
1530 }
1531
1532 /*
1533  * of_find_net_device_by_node - lookup the net device for the device node
1534  * @np: OF device node
1535  *
1536  * Looks up the net_device structure corresponding with the device node.
1537  * If successful, returns a pointer to the net_device with the embedded
1538  * struct device refcount incremented by one, or NULL on failure. The
1539  * refcount must be dropped when done with the net_device.
1540  */
1541 struct net_device *of_find_net_device_by_node(struct device_node *np)
1542 {
1543         struct device *dev;
1544
1545         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1546         if (!dev)
1547                 return NULL;
1548
1549         return to_net_dev(dev);
1550 }
1551 EXPORT_SYMBOL(of_find_net_device_by_node);
1552 #endif
1553
1554 /* Delete sysfs entries but hold kobject reference until after all
1555  * netdev references are gone.
1556  */
1557 void netdev_unregister_kobject(struct net_device *ndev)
1558 {
1559         struct device *dev = &ndev->dev;
1560
1561         if (!refcount_read(&dev_net(ndev)->count))
1562                 dev_set_uevent_suppress(dev, 1);
1563
1564         kobject_get(&dev->kobj);
1565
1566         remove_queue_kobjects(ndev);
1567
1568         pm_runtime_set_memalloc_noio(dev, false);
1569
1570         device_del(dev);
1571 }
1572
1573 /* Create sysfs entries for network device. */
1574 int netdev_register_kobject(struct net_device *ndev)
1575 {
1576         struct device *dev = &ndev->dev;
1577         const struct attribute_group **groups = ndev->sysfs_groups;
1578         int error = 0;
1579
1580         device_initialize(dev);
1581         dev->class = &net_class;
1582         dev->platform_data = ndev;
1583         dev->groups = groups;
1584
1585         dev_set_name(dev, "%s", ndev->name);
1586
1587 #ifdef CONFIG_SYSFS
1588         /* Allow for a device specific group */
1589         if (*groups)
1590                 groups++;
1591
1592         *groups++ = &netstat_group;
1593
1594 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1595         if (ndev->ieee80211_ptr)
1596                 *groups++ = &wireless_group;
1597 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1598         else if (ndev->wireless_handlers)
1599                 *groups++ = &wireless_group;
1600 #endif
1601 #endif
1602 #endif /* CONFIG_SYSFS */
1603
1604         error = device_add(dev);
1605         if (error)
1606                 return error;
1607
1608         error = register_queue_kobjects(ndev);
1609         if (error) {
1610                 device_del(dev);
1611                 return error;
1612         }
1613
1614         pm_runtime_set_memalloc_noio(dev, true);
1615
1616         return error;
1617 }
1618
1619 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1620                                 const void *ns)
1621 {
1622         return class_create_file_ns(&net_class, class_attr, ns);
1623 }
1624 EXPORT_SYMBOL(netdev_class_create_file_ns);
1625
1626 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1627                                  const void *ns)
1628 {
1629         class_remove_file_ns(&net_class, class_attr, ns);
1630 }
1631 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1632
1633 int __init netdev_kobject_init(void)
1634 {
1635         kobj_ns_type_register(&net_ns_type_operations);
1636         return class_register(&net_class);
1637 }