net/core/net-sysfs.c

   1 /*
   2  * net-sysfs.c - network device class and attributes
   3  *
   4  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/capability.h>
  13 #include <linux/kernel.h>
  14 #include <linux/netdevice.h>
  15 #include <net/switchdev.h>
  16 #include <linux/if_arp.h>
  17 #include <linux/slab.h>
  18 #include <linux/nsproxy.h>
  19 #include <net/sock.h>
  20 #include <net/net_namespace.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/vmalloc.h>
  23 #include <linux/export.h>
  24 #include <linux/jiffies.h>
  25 #include <linux/pm_runtime.h>
  26 #include <linux/of.h>
  27 #include <linux/of_net.h>
  28
  29 #include "net-sysfs.h"
  30
  31 #ifdef CONFIG_SYSFS
  32 static const char fmt_hex[] = "%#x\n";
  33 static const char fmt_dec[] = "%d\n";
  34 static const char fmt_ulong[] = "%lu\n";
  35 static const char fmt_u64[] = "%llu\n";
  36
  37 static inline int dev_isalive(const struct net_device *dev)
  38 {
  39         return dev->reg_state <= NETREG_REGISTERED;
  40 }
  41
  42 /* use same locking rules as GIF* ioctl's */
  43 static ssize_t netdev_show(const struct device *dev,
  44                            struct device_attribute *attr, char *buf,
  45                            ssize_t (*format)(const struct net_device *, char *))
  46 {
  47         struct net_device *ndev = to_net_dev(dev);
  48         ssize_t ret = -EINVAL;
  49
  50         read_lock(&dev_base_lock);
  51         if (dev_isalive(ndev))
  52                 ret = (*format)(ndev, buf);
  53         read_unlock(&dev_base_lock);
  54
  55         return ret;
  56 }
  57
  58 /* generate a show function for simple field */
  59 #define NETDEVICE_SHOW(field, format_string)                            \
  60 static ssize_t format_##field(const struct net_device *dev, char *buf)  \
  61 {                                                                       \
  62         return sprintf(buf, format_string, dev->field);                 \
  63 }                                                                       \
  64 static ssize_t field##_show(struct device *dev,                         \
  65                             struct device_attribute *attr, char *buf)   \
  66 {                                                                       \
  67         return netdev_show(dev, attr, buf, format_##field);             \
  68 }                                                                       \
  69
  70 #define NETDEVICE_SHOW_RO(field, format_string)                         \
  71 NETDEVICE_SHOW(field, format_string);                                   \
  72 static DEVICE_ATTR_RO(field)
  73
  74 #define NETDEVICE_SHOW_RW(field, format_string)                         \
  75 NETDEVICE_SHOW(field, format_string);                                   \
  76 static DEVICE_ATTR_RW(field)
  77
  78 /* use same locking and permission rules as SIF* ioctl's */
  79 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  80                             const char *buf, size_t len,
  81                             int (*set)(struct net_device *, unsigned long))
  82 {
  83         struct net_device *netdev = to_net_dev(dev);
  84         struct net *net = dev_net(netdev);
  85         unsigned long new;
  86         int ret = -EINVAL;
  87
  88         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  89                 return -EPERM;
  90
  91         ret = kstrtoul(buf, 0, &new);
  92         if (ret)
  93                 goto err;
  94
  95         if (!rtnl_trylock())
  96                 return restart_syscall();
  97
  98         if (dev_isalive(netdev)) {
  99                 if ((ret = (*set)(netdev, new)) == 0)
 100                         ret = len;
 101         }
 102         rtnl_unlock();
 103  err:
 104         return ret;
 105 }
 106
 107 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 108 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 109 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 110 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 111 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 112 NETDEVICE_SHOW_RO(type, fmt_dec);
 113 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 114
 115 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
 116                            char *buf)
 117 {
 118         struct net_device *ndev = to_net_dev(dev);
 119
 120         return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
 121 }
 122 static DEVICE_ATTR_RO(iflink);
 123
 124 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 125 {
 126         return sprintf(buf, fmt_dec, dev->name_assign_type);
 127 }
 128
 129 static ssize_t name_assign_type_show(struct device *dev,
 130                                      struct device_attribute *attr,
 131                                      char *buf)
 132 {
 133         struct net_device *ndev = to_net_dev(dev);
 134         ssize_t ret = -EINVAL;
 135
 136         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
 137                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
 138
 139         return ret;
 140 }
 141 static DEVICE_ATTR_RO(name_assign_type);
 142
 143 /* use same locking rules as GIFHWADDR ioctl's */
 144 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 145                             char *buf)
 146 {
 147         struct net_device *ndev = to_net_dev(dev);
 148         ssize_t ret = -EINVAL;
 149
 150         read_lock(&dev_base_lock);
 151         if (dev_isalive(ndev))
 152                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 153         read_unlock(&dev_base_lock);
 154         return ret;
 155 }
 156 static DEVICE_ATTR_RO(address);
 157
 158 static ssize_t broadcast_show(struct device *dev,
 159                               struct device_attribute *attr, char *buf)
 160 {
 161         struct net_device *ndev = to_net_dev(dev);
 162         if (dev_isalive(ndev))
 163                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
 164         return -EINVAL;
 165 }
 166 static DEVICE_ATTR_RO(broadcast);
 167
 168 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
 169 {
 170         if (!netif_running(dev))
 171                 return -EINVAL;
 172         return dev_change_carrier(dev, (bool) new_carrier);
 173 }
 174
 175 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 176                              const char *buf, size_t len)
 177 {
 178         return netdev_store(dev, attr, buf, len, change_carrier);
 179 }
 180
 181 static ssize_t carrier_show(struct device *dev,
 182                             struct device_attribute *attr, char *buf)
 183 {
 184         struct net_device *netdev = to_net_dev(dev);
 185         if (netif_running(netdev)) {
 186                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 187         }
 188         return -EINVAL;
 189 }
 190 static DEVICE_ATTR_RW(carrier);
 191
 192 static ssize_t speed_show(struct device *dev,
 193                           struct device_attribute *attr, char *buf)
 194 {
 195         struct net_device *netdev = to_net_dev(dev);
 196         int ret = -EINVAL;
 197
 198         if (!rtnl_trylock())
 199                 return restart_syscall();
 200
 201         if (netif_running(netdev)) {
 202                 struct ethtool_link_ksettings cmd;
 203
 204                 if (!__ethtool_get_link_ksettings(netdev, &cmd))
 205                         ret = sprintf(buf, fmt_dec, cmd.base.speed);
 206         }
 207         rtnl_unlock();
 208         return ret;
 209 }
 210 static DEVICE_ATTR_RO(speed);
 211
 212 static ssize_t duplex_show(struct device *dev,
 213                            struct device_attribute *attr, char *buf)
 214 {
 215         struct net_device *netdev = to_net_dev(dev);
 216         int ret = -EINVAL;
 217
 218         if (!rtnl_trylock())
 219                 return restart_syscall();
 220
 221         if (netif_running(netdev)) {
 222                 struct ethtool_link_ksettings cmd;
 223
 224                 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
 225                         const char *duplex;
 226
 227                         switch (cmd.base.duplex) {
 228                         case DUPLEX_HALF:
 229                                 duplex = "half";
 230                                 break;
 231                         case DUPLEX_FULL:
 232                                 duplex = "full";
 233                                 break;
 234                         default:
 235                                 duplex = "unknown";
 236                                 break;
 237                         }
 238                         ret = sprintf(buf, "%s\n", duplex);
 239                 }
 240         }
 241         rtnl_unlock();
 242         return ret;
 243 }
 244 static DEVICE_ATTR_RO(duplex);
 245
 246 static ssize_t dormant_show(struct device *dev,
 247                             struct device_attribute *attr, char *buf)
 248 {
 249         struct net_device *netdev = to_net_dev(dev);
 250
 251         if (netif_running(netdev))
 252                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 253
 254         return -EINVAL;
 255 }
 256 static DEVICE_ATTR_RO(dormant);
 257
 258 static const char *const operstates[] = {
 259         "unknown",
 260         "notpresent", /* currently unused */
 261         "down",
 262         "lowerlayerdown",
 263         "testing", /* currently unused */
 264         "dormant",
 265         "up"
 266 };
 267
 268 static ssize_t operstate_show(struct device *dev,
 269                               struct device_attribute *attr, char *buf)
 270 {
 271         const struct net_device *netdev = to_net_dev(dev);
 272         unsigned char operstate;
 273
 274         read_lock(&dev_base_lock);
 275         operstate = netdev->operstate;
 276         if (!netif_running(netdev))
 277                 operstate = IF_OPER_DOWN;
 278         read_unlock(&dev_base_lock);
 279
 280         if (operstate >= ARRAY_SIZE(operstates))
 281                 return -EINVAL; /* should not happen */
 282
 283         return sprintf(buf, "%s\n", operstates[operstate]);
 284 }
 285 static DEVICE_ATTR_RO(operstate);
 286
 287 static ssize_t carrier_changes_show(struct device *dev,
 288                                     struct device_attribute *attr,
 289                                     char *buf)
 290 {
 291         struct net_device *netdev = to_net_dev(dev);
 292         return sprintf(buf, fmt_dec,
 293                        atomic_read(&netdev->carrier_changes));
 294 }
 295 static DEVICE_ATTR_RO(carrier_changes);
 296
 297 /* read-write attributes */
 298
 299 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 300 {
 301         return dev_set_mtu(dev, (int) new_mtu);
 302 }
 303
 304 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 305                          const char *buf, size_t len)
 306 {
 307         return netdev_store(dev, attr, buf, len, change_mtu);
 308 }
 309 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 310
 311 static int change_flags(struct net_device *dev, unsigned long new_flags)
 312 {
 313         return dev_change_flags(dev, (unsigned int) new_flags);
 314 }
 315
 316 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 317                            const char *buf, size_t len)
 318 {
 319         return netdev_store(dev, attr, buf, len, change_flags);
 320 }
 321 NETDEVICE_SHOW_RW(flags, fmt_hex);
 322
 323 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
 324 {
 325         int res, orig_len = dev->tx_queue_len;
 326
 327         if (new_len != orig_len) {
 328                 dev->tx_queue_len = new_len;
 329                 res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev);
 330                 res = notifier_to_errno(res);
 331                 if (res) {
 332                         netdev_err(dev,
 333                                    "refused to change device tx_queue_len\n");
 334                         dev->tx_queue_len = orig_len;
 335                         return -EFAULT;
 336                 }
 337         }
 338
 339         return 0;
 340 }
 341
 342 static ssize_t tx_queue_len_store(struct device *dev,
 343                                   struct device_attribute *attr,
 344                                   const char *buf, size_t len)
 345 {
 346         if (!capable(CAP_NET_ADMIN))
 347                 return -EPERM;
 348
 349         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
 350 }
 351 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
 352
 353 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 354 {
 355         dev->gro_flush_timeout = val;
 356         return 0;
 357 }
 358
 359 static ssize_t gro_flush_timeout_store(struct device *dev,
 360                                   struct device_attribute *attr,
 361                                   const char *buf, size_t len)
 362 {
 363         if (!capable(CAP_NET_ADMIN))
 364                 return -EPERM;
 365
 366         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 367 }
 368 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 369
 370 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 371                              const char *buf, size_t len)
 372 {
 373         struct net_device *netdev = to_net_dev(dev);
 374         struct net *net = dev_net(netdev);
 375         size_t count = len;
 376         ssize_t ret;
 377
 378         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 379                 return -EPERM;
 380
 381         /* ignore trailing newline */
 382         if (len >  0 && buf[len - 1] == '\n')
 383                 --count;
 384
 385         if (!rtnl_trylock())
 386                 return restart_syscall();
 387         ret = dev_set_alias(netdev, buf, count);
 388         rtnl_unlock();
 389
 390         return ret < 0 ? ret : len;
 391 }
 392
 393 static ssize_t ifalias_show(struct device *dev,
 394                             struct device_attribute *attr, char *buf)
 395 {
 396         const struct net_device *netdev = to_net_dev(dev);
 397         ssize_t ret = 0;
 398
 399         if (!rtnl_trylock())
 400                 return restart_syscall();
 401         if (netdev->ifalias)
 402                 ret = sprintf(buf, "%s\n", netdev->ifalias);
 403         rtnl_unlock();
 404         return ret;
 405 }
 406 static DEVICE_ATTR_RW(ifalias);
 407
 408 static int change_group(struct net_device *dev, unsigned long new_group)
 409 {
 410         dev_set_group(dev, (int) new_group);
 411         return 0;
 412 }
 413
 414 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 415                            const char *buf, size_t len)
 416 {
 417         return netdev_store(dev, attr, buf, len, change_group);
 418 }
 419 NETDEVICE_SHOW(group, fmt_dec);
 420 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
 421
 422 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 423 {
 424         return dev_change_proto_down(dev, (bool) proto_down);
 425 }
 426
 427 static ssize_t proto_down_store(struct device *dev,
 428                                 struct device_attribute *attr,
 429                                 const char *buf, size_t len)
 430 {
 431         return netdev_store(dev, attr, buf, len, change_proto_down);
 432 }
 433 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 434
 435 static ssize_t phys_port_id_show(struct device *dev,
 436                                  struct device_attribute *attr, char *buf)
 437 {
 438         struct net_device *netdev = to_net_dev(dev);
 439         ssize_t ret = -EINVAL;
 440
 441         if (!rtnl_trylock())
 442                 return restart_syscall();
 443
 444         if (dev_isalive(netdev)) {
 445                 struct netdev_phys_item_id ppid;
 446
 447                 ret = dev_get_phys_port_id(netdev, &ppid);
 448                 if (!ret)
 449                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 450         }
 451         rtnl_unlock();
 452
 453         return ret;
 454 }
 455 static DEVICE_ATTR_RO(phys_port_id);
 456
 457 static ssize_t phys_port_name_show(struct device *dev,
 458                                    struct device_attribute *attr, char *buf)
 459 {
 460         struct net_device *netdev = to_net_dev(dev);
 461         ssize_t ret = -EINVAL;
 462
 463         if (!rtnl_trylock())
 464                 return restart_syscall();
 465
 466         if (dev_isalive(netdev)) {
 467                 char name[IFNAMSIZ];
 468
 469                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 470                 if (!ret)
 471                         ret = sprintf(buf, "%s\n", name);
 472         }
 473         rtnl_unlock();
 474
 475         return ret;
 476 }
 477 static DEVICE_ATTR_RO(phys_port_name);
 478
 479 static ssize_t phys_switch_id_show(struct device *dev,
 480                                    struct device_attribute *attr, char *buf)
 481 {
 482         struct net_device *netdev = to_net_dev(dev);
 483         ssize_t ret = -EINVAL;
 484
 485         if (!rtnl_trylock())
 486                 return restart_syscall();
 487
 488         if (dev_isalive(netdev)) {
 489                 struct switchdev_attr attr = {
 490                         .orig_dev = netdev,
 491                         .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
 492                         .flags = SWITCHDEV_F_NO_RECURSE,
 493                 };
 494
 495                 ret = switchdev_port_attr_get(netdev, &attr);
 496                 if (!ret)
 497                         ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
 498                                       attr.u.ppid.id);
 499         }
 500         rtnl_unlock();
 501
 502         return ret;
 503 }
 504 static DEVICE_ATTR_RO(phys_switch_id);
 505
 506 static struct attribute *net_class_attrs[] = {
 507         &dev_attr_netdev_group.attr,
 508         &dev_attr_type.attr,
 509         &dev_attr_dev_id.attr,
 510         &dev_attr_dev_port.attr,
 511         &dev_attr_iflink.attr,
 512         &dev_attr_ifindex.attr,
 513         &dev_attr_name_assign_type.attr,
 514         &dev_attr_addr_assign_type.attr,
 515         &dev_attr_addr_len.attr,
 516         &dev_attr_link_mode.attr,
 517         &dev_attr_address.attr,
 518         &dev_attr_broadcast.attr,
 519         &dev_attr_speed.attr,
 520         &dev_attr_duplex.attr,
 521         &dev_attr_dormant.attr,
 522         &dev_attr_operstate.attr,
 523         &dev_attr_carrier_changes.attr,
 524         &dev_attr_ifalias.attr,
 525         &dev_attr_carrier.attr,
 526         &dev_attr_mtu.attr,
 527         &dev_attr_flags.attr,
 528         &dev_attr_tx_queue_len.attr,
 529         &dev_attr_gro_flush_timeout.attr,
 530         &dev_attr_phys_port_id.attr,
 531         &dev_attr_phys_port_name.attr,
 532         &dev_attr_phys_switch_id.attr,
 533         &dev_attr_proto_down.attr,
 534         NULL,
 535 };
 536 ATTRIBUTE_GROUPS(net_class);
 537
 538 /* Show a given an attribute in the statistics group */
 539 static ssize_t netstat_show(const struct device *d,
 540                             struct device_attribute *attr, char *buf,
 541                             unsigned long offset)
 542 {
 543         struct net_device *dev = to_net_dev(d);
 544         ssize_t ret = -EINVAL;
 545
 546         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 547                         offset % sizeof(u64) != 0);
 548
 549         read_lock(&dev_base_lock);
 550         if (dev_isalive(dev)) {
 551                 struct rtnl_link_stats64 temp;
 552                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 553
 554                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
 555         }
 556         read_unlock(&dev_base_lock);
 557         return ret;
 558 }
 559
 560 /* generate a read-only statistics attribute */
 561 #define NETSTAT_ENTRY(name)                                             \
 562 static ssize_t name##_show(struct device *d,                            \
 563                            struct device_attribute *attr, char *buf)    \
 564 {                                                                       \
 565         return netstat_show(d, attr, buf,                               \
 566                             offsetof(struct rtnl_link_stats64, name));  \
 567 }                                                                       \
 568 static DEVICE_ATTR_RO(name)
 569
 570 NETSTAT_ENTRY(rx_packets);
 571 NETSTAT_ENTRY(tx_packets);
 572 NETSTAT_ENTRY(rx_bytes);
 573 NETSTAT_ENTRY(tx_bytes);
 574 NETSTAT_ENTRY(rx_errors);
 575 NETSTAT_ENTRY(tx_errors);
 576 NETSTAT_ENTRY(rx_dropped);
 577 NETSTAT_ENTRY(tx_dropped);
 578 NETSTAT_ENTRY(multicast);
 579 NETSTAT_ENTRY(collisions);
 580 NETSTAT_ENTRY(rx_length_errors);
 581 NETSTAT_ENTRY(rx_over_errors);
 582 NETSTAT_ENTRY(rx_crc_errors);
 583 NETSTAT_ENTRY(rx_frame_errors);
 584 NETSTAT_ENTRY(rx_fifo_errors);
 585 NETSTAT_ENTRY(rx_missed_errors);
 586 NETSTAT_ENTRY(tx_aborted_errors);
 587 NETSTAT_ENTRY(tx_carrier_errors);
 588 NETSTAT_ENTRY(tx_fifo_errors);
 589 NETSTAT_ENTRY(tx_heartbeat_errors);
 590 NETSTAT_ENTRY(tx_window_errors);
 591 NETSTAT_ENTRY(rx_compressed);
 592 NETSTAT_ENTRY(tx_compressed);
 593 NETSTAT_ENTRY(rx_nohandler);
 594
 595 static struct attribute *netstat_attrs[] = {
 596         &dev_attr_rx_packets.attr,
 597         &dev_attr_tx_packets.attr,
 598         &dev_attr_rx_bytes.attr,
 599         &dev_attr_tx_bytes.attr,
 600         &dev_attr_rx_errors.attr,
 601         &dev_attr_tx_errors.attr,
 602         &dev_attr_rx_dropped.attr,
 603         &dev_attr_tx_dropped.attr,
 604         &dev_attr_multicast.attr,
 605         &dev_attr_collisions.attr,
 606         &dev_attr_rx_length_errors.attr,
 607         &dev_attr_rx_over_errors.attr,
 608         &dev_attr_rx_crc_errors.attr,
 609         &dev_attr_rx_frame_errors.attr,
 610         &dev_attr_rx_fifo_errors.attr,
 611         &dev_attr_rx_missed_errors.attr,
 612         &dev_attr_tx_aborted_errors.attr,
 613         &dev_attr_tx_carrier_errors.attr,
 614         &dev_attr_tx_fifo_errors.attr,
 615         &dev_attr_tx_heartbeat_errors.attr,
 616         &dev_attr_tx_window_errors.attr,
 617         &dev_attr_rx_compressed.attr,
 618         &dev_attr_tx_compressed.attr,
 619         &dev_attr_rx_nohandler.attr,
 620         NULL
 621 };
 622
 623
 624 static struct attribute_group netstat_group = {
 625         .name  = "statistics",
 626         .attrs  = netstat_attrs,
 627 };
 628
 629 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 630 static struct attribute *wireless_attrs[] = {
 631         NULL
 632 };
 633
 634 static struct attribute_group wireless_group = {
 635         .name = "wireless",
 636         .attrs = wireless_attrs,
 637 };
 638 #endif
 639
 640 #else /* CONFIG_SYSFS */
 641 #define net_class_groups        NULL
 642 #endif /* CONFIG_SYSFS */
 643
 644 #ifdef CONFIG_SYSFS
 645 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 646     struct rx_queue_attribute, attr)
 647
 648 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 649
 650 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 651                                   char *buf)
 652 {
 653         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 654         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 655
 656         if (!attribute->show)
 657                 return -EIO;
 658
 659         return attribute->show(queue, attribute, buf);
 660 }
 661
 662 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 663                                    const char *buf, size_t count)
 664 {
 665         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 666         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 667
 668         if (!attribute->store)
 669                 return -EIO;
 670
 671         return attribute->store(queue, attribute, buf, count);
 672 }
 673
 674 static const struct sysfs_ops rx_queue_sysfs_ops = {
 675         .show = rx_queue_attr_show,
 676         .store = rx_queue_attr_store,
 677 };
 678
 679 #ifdef CONFIG_RPS
 680 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 681                             struct rx_queue_attribute *attribute, char *buf)
 682 {
 683         struct rps_map *map;
 684         cpumask_var_t mask;
 685         int i, len;
 686
 687         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 688                 return -ENOMEM;
 689
 690         rcu_read_lock();
 691         map = rcu_dereference(queue->rps_map);
 692         if (map)
 693                 for (i = 0; i < map->len; i++)
 694                         cpumask_set_cpu(map->cpus[i], mask);
 695
 696         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 697         rcu_read_unlock();
 698         free_cpumask_var(mask);
 699
 700         return len < PAGE_SIZE ? len : -EINVAL;
 701 }
 702
 703 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 704                       struct rx_queue_attribute *attribute,
 705                       const char *buf, size_t len)
 706 {
 707         struct rps_map *old_map, *map;
 708         cpumask_var_t mask;
 709         int err, cpu, i;
 710         static DEFINE_MUTEX(rps_map_mutex);
 711
 712         if (!capable(CAP_NET_ADMIN))
 713                 return -EPERM;
 714
 715         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 716                 return -ENOMEM;
 717
 718         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 719         if (err) {
 720                 free_cpumask_var(mask);
 721                 return err;
 722         }
 723
 724         map = kzalloc(max_t(unsigned int,
 725             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 726             GFP_KERNEL);
 727         if (!map) {
 728                 free_cpumask_var(mask);
 729                 return -ENOMEM;
 730         }
 731
 732         i = 0;
 733         for_each_cpu_and(cpu, mask, cpu_online_mask)
 734                 map->cpus[i++] = cpu;
 735
 736         if (i)
 737                 map->len = i;
 738         else {
 739                 kfree(map);
 740                 map = NULL;
 741         }
 742
 743         mutex_lock(&rps_map_mutex);
 744         old_map = rcu_dereference_protected(queue->rps_map,
 745                                             mutex_is_locked(&rps_map_mutex));
 746         rcu_assign_pointer(queue->rps_map, map);
 747
 748         if (map)
 749                 static_key_slow_inc(&rps_needed);
 750         if (old_map)
 751                 static_key_slow_dec(&rps_needed);
 752
 753         mutex_unlock(&rps_map_mutex);
 754
 755         if (old_map)
 756                 kfree_rcu(old_map, rcu);
 757
 758         free_cpumask_var(mask);
 759         return len;
 760 }
 761
 762 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 763                                            struct rx_queue_attribute *attr,
 764                                            char *buf)
 765 {
 766         struct rps_dev_flow_table *flow_table;
 767         unsigned long val = 0;
 768
 769         rcu_read_lock();
 770         flow_table = rcu_dereference(queue->rps_flow_table);
 771         if (flow_table)
 772                 val = (unsigned long)flow_table->mask + 1;
 773         rcu_read_unlock();
 774
 775         return sprintf(buf, "%lu\n", val);
 776 }
 777
 778 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 779 {
 780         struct rps_dev_flow_table *table = container_of(rcu,
 781             struct rps_dev_flow_table, rcu);
 782         vfree(table);
 783 }
 784
 785 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 786                                      struct rx_queue_attribute *attr,
 787                                      const char *buf, size_t len)
 788 {
 789         unsigned long mask, count;
 790         struct rps_dev_flow_table *table, *old_table;
 791         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 792         int rc;
 793
 794         if (!capable(CAP_NET_ADMIN))
 795                 return -EPERM;
 796
 797         rc = kstrtoul(buf, 0, &count);
 798         if (rc < 0)
 799                 return rc;
 800
 801         if (count) {
 802                 mask = count - 1;
 803                 /* mask = roundup_pow_of_two(count) - 1;
 804                  * without overflows...
 805                  */
 806                 while ((mask | (mask >> 1)) != mask)
 807                         mask |= (mask >> 1);
 808                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 809                  * and on 32bit arches, must check
 810                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 811                  */
 812 #if BITS_PER_LONG > 32
 813                 if (mask > (unsigned long)(u32)mask)
 814                         return -EINVAL;
 815 #else
 816                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 817                                 / sizeof(struct rps_dev_flow)) {
 818                         /* Enforce a limit to prevent overflow */
 819                         return -EINVAL;
 820                 }
 821 #endif
 822                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 823                 if (!table)
 824                         return -ENOMEM;
 825
 826                 table->mask = mask;
 827                 for (count = 0; count <= mask; count++)
 828                         table->flows[count].cpu = RPS_NO_CPU;
 829         } else
 830                 table = NULL;
 831
 832         spin_lock(&rps_dev_flow_lock);
 833         old_table = rcu_dereference_protected(queue->rps_flow_table,
 834                                               lockdep_is_held(&rps_dev_flow_lock));
 835         rcu_assign_pointer(queue->rps_flow_table, table);
 836         spin_unlock(&rps_dev_flow_lock);
 837
 838         if (old_table)
 839                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 840
 841         return len;
 842 }
 843
 844 static struct rx_queue_attribute rps_cpus_attribute =
 845         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 846
 847
 848 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 849         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 850             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 851 #endif /* CONFIG_RPS */
 852
 853 static struct attribute *rx_queue_default_attrs[] = {
 854 #ifdef CONFIG_RPS
 855         &rps_cpus_attribute.attr,
 856         &rps_dev_flow_table_cnt_attribute.attr,
 857 #endif
 858         NULL
 859 };
 860
 861 static void rx_queue_release(struct kobject *kobj)
 862 {
 863         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 864 #ifdef CONFIG_RPS
 865         struct rps_map *map;
 866         struct rps_dev_flow_table *flow_table;
 867
 868
 869         map = rcu_dereference_protected(queue->rps_map, 1);
 870         if (map) {
 871                 RCU_INIT_POINTER(queue->rps_map, NULL);
 872                 kfree_rcu(map, rcu);
 873         }
 874
 875         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 876         if (flow_table) {
 877                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 878                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 879         }
 880 #endif
 881
 882         memset(kobj, 0, sizeof(*kobj));
 883         dev_put(queue->dev);
 884 }
 885
 886 static const void *rx_queue_namespace(struct kobject *kobj)
 887 {
 888         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 889         struct device *dev = &queue->dev->dev;
 890         const void *ns = NULL;
 891
 892         if (dev->class && dev->class->ns_type)
 893                 ns = dev->class->namespace(dev);
 894
 895         return ns;
 896 }
 897
 898 static struct kobj_type rx_queue_ktype = {
 899         .sysfs_ops = &rx_queue_sysfs_ops,
 900         .release = rx_queue_release,
 901         .default_attrs = rx_queue_default_attrs,
 902         .namespace = rx_queue_namespace
 903 };
 904
 905 static int rx_queue_add_kobject(struct net_device *dev, int index)
 906 {
 907         struct netdev_rx_queue *queue = dev->_rx + index;
 908         struct kobject *kobj = &queue->kobj;
 909         int error = 0;
 910
 911         kobj->kset = dev->queues_kset;
 912         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 913             "rx-%u", index);
 914         if (error)
 915                 goto exit;
 916
 917         if (dev->sysfs_rx_queue_group) {
 918                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
 919                 if (error)
 920                         goto exit;
 921         }
 922
 923         kobject_uevent(kobj, KOBJ_ADD);
 924         dev_hold(queue->dev);
 925
 926         return error;
 927 exit:
 928         kobject_put(kobj);
 929         return error;
 930 }
 931 #endif /* CONFIG_SYSFS */
 932
 933 int
 934 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
 935 {
 936 #ifdef CONFIG_SYSFS
 937         int i;
 938         int error = 0;
 939
 940 #ifndef CONFIG_RPS
 941         if (!dev->sysfs_rx_queue_group)
 942                 return 0;
 943 #endif
 944         for (i = old_num; i < new_num; i++) {
 945                 error = rx_queue_add_kobject(dev, i);
 946                 if (error) {
 947                         new_num = old_num;
 948                         break;
 949                 }
 950         }
 951
 952         while (--i >= new_num) {
 953                 if (dev->sysfs_rx_queue_group)
 954                         sysfs_remove_group(&dev->_rx[i].kobj,
 955                                            dev->sysfs_rx_queue_group);
 956                 kobject_put(&dev->_rx[i].kobj);
 957         }
 958
 959         return error;
 960 #else
 961         return 0;
 962 #endif
 963 }
 964
 965 #ifdef CONFIG_SYSFS
 966 /*
 967  * netdev_queue sysfs structures and functions.
 968  */
 969 struct netdev_queue_attribute {
 970         struct attribute attr;
 971         ssize_t (*show)(struct netdev_queue *queue,
 972             struct netdev_queue_attribute *attr, char *buf);
 973         ssize_t (*store)(struct netdev_queue *queue,
 974             struct netdev_queue_attribute *attr, const char *buf, size_t len);
 975 };
 976 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
 977     struct netdev_queue_attribute, attr)
 978
 979 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 980
 981 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 982                                       struct attribute *attr, char *buf)
 983 {
 984         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 985         struct netdev_queue *queue = to_netdev_queue(kobj);
 986
 987         if (!attribute->show)
 988                 return -EIO;
 989
 990         return attribute->show(queue, attribute, buf);
 991 }
 992
 993 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 994                                        struct attribute *attr,
 995                                        const char *buf, size_t count)
 996 {
 997         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 998         struct netdev_queue *queue = to_netdev_queue(kobj);
 999
1000         if (!attribute->store)
1001                 return -EIO;
1002
1003         return attribute->store(queue, attribute, buf, count);
1004 }
1005
1006 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1007         .show = netdev_queue_attr_show,
1008         .store = netdev_queue_attr_store,
1009 };
1010
1011 static ssize_t show_trans_timeout(struct netdev_queue *queue,
1012                                   struct netdev_queue_attribute *attribute,
1013                                   char *buf)
1014 {
1015         unsigned long trans_timeout;
1016
1017         spin_lock_irq(&queue->_xmit_lock);
1018         trans_timeout = queue->trans_timeout;
1019         spin_unlock_irq(&queue->_xmit_lock);
1020
1021         return sprintf(buf, "%lu", trans_timeout);
1022 }
1023
1024 #ifdef CONFIG_XPS
1025 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1026 {
1027         struct net_device *dev = queue->dev;
1028         unsigned int i;
1029
1030         i = queue - dev->_tx;
1031         BUG_ON(i >= dev->num_tx_queues);
1032
1033         return i;
1034 }
1035
1036 static ssize_t show_tx_maxrate(struct netdev_queue *queue,
1037                                struct netdev_queue_attribute *attribute,
1038                                char *buf)
1039 {
1040         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1041 }
1042
1043 static ssize_t set_tx_maxrate(struct netdev_queue *queue,
1044                               struct netdev_queue_attribute *attribute,
1045                               const char *buf, size_t len)
1046 {
1047         struct net_device *dev = queue->dev;
1048         int err, index = get_netdev_queue_index(queue);
1049         u32 rate = 0;
1050
1051         err = kstrtou32(buf, 10, &rate);
1052         if (err < 0)
1053                 return err;
1054
1055         if (!rtnl_trylock())
1056                 return restart_syscall();
1057
1058         err = -EOPNOTSUPP;
1059         if (dev->netdev_ops->ndo_set_tx_maxrate)
1060                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1061
1062         rtnl_unlock();
1063         if (!err) {
1064                 queue->tx_maxrate = rate;
1065                 return len;
1066         }
1067         return err;
1068 }
1069
1070 static struct netdev_queue_attribute queue_tx_maxrate =
1071         __ATTR(tx_maxrate, S_IRUGO | S_IWUSR,
1072                show_tx_maxrate, set_tx_maxrate);
1073 #endif
1074
1075 static struct netdev_queue_attribute queue_trans_timeout =
1076         __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
1077
1078 #ifdef CONFIG_BQL
1079 /*
1080  * Byte queue limits sysfs structures and functions.
1081  */
1082 static ssize_t bql_show(char *buf, unsigned int value)
1083 {
1084         return sprintf(buf, "%u\n", value);
1085 }
1086
1087 static ssize_t bql_set(const char *buf, const size_t count,
1088                        unsigned int *pvalue)
1089 {
1090         unsigned int value;
1091         int err;
1092
1093         if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
1094                 value = DQL_MAX_LIMIT;
1095         else {
1096                 err = kstrtouint(buf, 10, &value);
1097                 if (err < 0)
1098                         return err;
1099                 if (value > DQL_MAX_LIMIT)
1100                         return -EINVAL;
1101         }
1102
1103         *pvalue = value;
1104
1105         return count;
1106 }
1107
1108 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1109                                   struct netdev_queue_attribute *attr,
1110                                   char *buf)
1111 {
1112         struct dql *dql = &queue->dql;
1113
1114         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1115 }
1116
1117 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1118                                  struct netdev_queue_attribute *attribute,
1119                                  const char *buf, size_t len)
1120 {
1121         struct dql *dql = &queue->dql;
1122         unsigned int value;
1123         int err;
1124
1125         err = kstrtouint(buf, 10, &value);
1126         if (err < 0)
1127                 return err;
1128
1129         dql->slack_hold_time = msecs_to_jiffies(value);
1130
1131         return len;
1132 }
1133
1134 static struct netdev_queue_attribute bql_hold_time_attribute =
1135         __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
1136             bql_set_hold_time);
1137
1138 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1139                                  struct netdev_queue_attribute *attr,
1140                                  char *buf)
1141 {
1142         struct dql *dql = &queue->dql;
1143
1144         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1145 }
1146
1147 static struct netdev_queue_attribute bql_inflight_attribute =
1148         __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
1149
1150 #define BQL_ATTR(NAME, FIELD)                                           \
1151 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1152                                  struct netdev_queue_attribute *attr,   \
1153                                  char *buf)                             \
1154 {                                                                       \
1155         return bql_show(buf, queue->dql.FIELD);                         \
1156 }                                                                       \
1157                                                                         \
1158 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1159                                 struct netdev_queue_attribute *attr,    \
1160                                 const char *buf, size_t len)            \
1161 {                                                                       \
1162         return bql_set(buf, len, &queue->dql.FIELD);                    \
1163 }                                                                       \
1164                                                                         \
1165 static struct netdev_queue_attribute bql_ ## NAME ## _attribute =       \
1166         __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME,              \
1167             bql_set_ ## NAME);
1168
1169 BQL_ATTR(limit, limit)
1170 BQL_ATTR(limit_max, max_limit)
1171 BQL_ATTR(limit_min, min_limit)
1172
1173 static struct attribute *dql_attrs[] = {
1174         &bql_limit_attribute.attr,
1175         &bql_limit_max_attribute.attr,
1176         &bql_limit_min_attribute.attr,
1177         &bql_hold_time_attribute.attr,
1178         &bql_inflight_attribute.attr,
1179         NULL
1180 };
1181
1182 static struct attribute_group dql_group = {
1183         .name  = "byte_queue_limits",
1184         .attrs  = dql_attrs,
1185 };
1186 #endif /* CONFIG_BQL */
1187
1188 #ifdef CONFIG_XPS
1189 static ssize_t show_xps_map(struct netdev_queue *queue,
1190                             struct netdev_queue_attribute *attribute, char *buf)
1191 {
1192         struct net_device *dev = queue->dev;
1193         struct xps_dev_maps *dev_maps;
1194         cpumask_var_t mask;
1195         unsigned long index;
1196         int i, len;
1197
1198         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1199                 return -ENOMEM;
1200
1201         index = get_netdev_queue_index(queue);
1202
1203         rcu_read_lock();
1204         dev_maps = rcu_dereference(dev->xps_maps);
1205         if (dev_maps) {
1206                 for_each_possible_cpu(i) {
1207                         struct xps_map *map =
1208                             rcu_dereference(dev_maps->cpu_map[i]);
1209                         if (map) {
1210                                 int j;
1211                                 for (j = 0; j < map->len; j++) {
1212                                         if (map->queues[j] == index) {
1213                                                 cpumask_set_cpu(i, mask);
1214                                                 break;
1215                                         }
1216                                 }
1217                         }
1218                 }
1219         }
1220         rcu_read_unlock();
1221
1222         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1223         free_cpumask_var(mask);
1224         return len < PAGE_SIZE ? len : -EINVAL;
1225 }
1226
1227 static ssize_t store_xps_map(struct netdev_queue *queue,
1228                       struct netdev_queue_attribute *attribute,
1229                       const char *buf, size_t len)
1230 {
1231         struct net_device *dev = queue->dev;
1232         unsigned long index;
1233         cpumask_var_t mask;
1234         int err;
1235
1236         if (!capable(CAP_NET_ADMIN))
1237                 return -EPERM;
1238
1239         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1240                 return -ENOMEM;
1241
1242         index = get_netdev_queue_index(queue);
1243
1244         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1245         if (err) {
1246                 free_cpumask_var(mask);
1247                 return err;
1248         }
1249
1250         err = netif_set_xps_queue(dev, mask, index);
1251
1252         free_cpumask_var(mask);
1253
1254         return err ? : len;
1255 }
1256
1257 static struct netdev_queue_attribute xps_cpus_attribute =
1258     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1259 #endif /* CONFIG_XPS */
1260
1261 static struct attribute *netdev_queue_default_attrs[] = {
1262         &queue_trans_timeout.attr,
1263 #ifdef CONFIG_XPS
1264         &xps_cpus_attribute.attr,
1265         &queue_tx_maxrate.attr,
1266 #endif
1267         NULL
1268 };
1269
1270 static void netdev_queue_release(struct kobject *kobj)
1271 {
1272         struct netdev_queue *queue = to_netdev_queue(kobj);
1273
1274         memset(kobj, 0, sizeof(*kobj));
1275         dev_put(queue->dev);
1276 }
1277
1278 static const void *netdev_queue_namespace(struct kobject *kobj)
1279 {
1280         struct netdev_queue *queue = to_netdev_queue(kobj);
1281         struct device *dev = &queue->dev->dev;
1282         const void *ns = NULL;
1283
1284         if (dev->class && dev->class->ns_type)
1285                 ns = dev->class->namespace(dev);
1286
1287         return ns;
1288 }
1289
1290 static struct kobj_type netdev_queue_ktype = {
1291         .sysfs_ops = &netdev_queue_sysfs_ops,
1292         .release = netdev_queue_release,
1293         .default_attrs = netdev_queue_default_attrs,
1294         .namespace = netdev_queue_namespace,
1295 };
1296
1297 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1298 {
1299         struct netdev_queue *queue = dev->_tx + index;
1300         struct kobject *kobj = &queue->kobj;
1301         int error = 0;
1302
1303         kobj->kset = dev->queues_kset;
1304         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1305             "tx-%u", index);
1306         if (error)
1307                 goto exit;
1308
1309 #ifdef CONFIG_BQL
1310         error = sysfs_create_group(kobj, &dql_group);
1311         if (error)
1312                 goto exit;
1313 #endif
1314
1315         kobject_uevent(kobj, KOBJ_ADD);
1316         dev_hold(queue->dev);
1317
1318         return 0;
1319 exit:
1320         kobject_put(kobj);
1321         return error;
1322 }
1323 #endif /* CONFIG_SYSFS */
1324
1325 int
1326 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1327 {
1328 #ifdef CONFIG_SYSFS
1329         int i;
1330         int error = 0;
1331
1332         for (i = old_num; i < new_num; i++) {
1333                 error = netdev_queue_add_kobject(dev, i);
1334                 if (error) {
1335                         new_num = old_num;
1336                         break;
1337                 }
1338         }
1339
1340         while (--i >= new_num) {
1341                 struct netdev_queue *queue = dev->_tx + i;
1342
1343 #ifdef CONFIG_BQL
1344                 sysfs_remove_group(&queue->kobj, &dql_group);
1345 #endif
1346                 kobject_put(&queue->kobj);
1347         }
1348
1349         return error;
1350 #else
1351         return 0;
1352 #endif /* CONFIG_SYSFS */
1353 }
1354
1355 static int register_queue_kobjects(struct net_device *dev)
1356 {
1357         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1358
1359 #ifdef CONFIG_SYSFS
1360         dev->queues_kset = kset_create_and_add("queues",
1361             NULL, &dev->dev.kobj);
1362         if (!dev->queues_kset)
1363                 return -ENOMEM;
1364         real_rx = dev->real_num_rx_queues;
1365 #endif
1366         real_tx = dev->real_num_tx_queues;
1367
1368         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1369         if (error)
1370                 goto error;
1371         rxq = real_rx;
1372
1373         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1374         if (error)
1375                 goto error;
1376         txq = real_tx;
1377
1378         return 0;
1379
1380 error:
1381         netdev_queue_update_kobjects(dev, txq, 0);
1382         net_rx_queue_update_kobjects(dev, rxq, 0);
1383         return error;
1384 }
1385
1386 static void remove_queue_kobjects(struct net_device *dev)
1387 {
1388         int real_rx = 0, real_tx = 0;
1389
1390 #ifdef CONFIG_SYSFS
1391         real_rx = dev->real_num_rx_queues;
1392 #endif
1393         real_tx = dev->real_num_tx_queues;
1394
1395         net_rx_queue_update_kobjects(dev, real_rx, 0);
1396         netdev_queue_update_kobjects(dev, real_tx, 0);
1397 #ifdef CONFIG_SYSFS
1398         kset_unregister(dev->queues_kset);
1399 #endif
1400 }
1401
1402 static bool net_current_may_mount(void)
1403 {
1404         struct net *net = current->nsproxy->net_ns;
1405
1406         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1407 }
1408
1409 static void *net_grab_current_ns(void)
1410 {
1411         struct net *ns = current->nsproxy->net_ns;
1412 #ifdef CONFIG_NET_NS
1413         if (ns)
1414                 atomic_inc(&ns->passive);
1415 #endif
1416         return ns;
1417 }
1418
1419 static const void *net_initial_ns(void)
1420 {
1421         return &init_net;
1422 }
1423
1424 static const void *net_netlink_ns(struct sock *sk)
1425 {
1426         return sock_net(sk);
1427 }
1428
1429 struct kobj_ns_type_operations net_ns_type_operations = {
1430         .type = KOBJ_NS_TYPE_NET,
1431         .current_may_mount = net_current_may_mount,
1432         .grab_current_ns = net_grab_current_ns,
1433         .netlink_ns = net_netlink_ns,
1434         .initial_ns = net_initial_ns,
1435         .drop_ns = net_drop_ns,
1436 };
1437 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1438
1439 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1440 {
1441         struct net_device *dev = to_net_dev(d);
1442         int retval;
1443
1444         /* pass interface to uevent. */
1445         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1446         if (retval)
1447                 goto exit;
1448
1449         /* pass ifindex to uevent.
1450          * ifindex is useful as it won't change (interface name may change)
1451          * and is what RtNetlink uses natively. */
1452         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1453
1454 exit:
1455         return retval;
1456 }
1457
1458 /*
1459  *      netdev_release -- destroy and free a dead device.
1460  *      Called when last reference to device kobject is gone.
1461  */
1462 static void netdev_release(struct device *d)
1463 {
1464         struct net_device *dev = to_net_dev(d);
1465
1466         BUG_ON(dev->reg_state != NETREG_RELEASED);
1467
1468         kfree(dev->ifalias);
1469         netdev_freemem(dev);
1470 }
1471
1472 static const void *net_namespace(struct device *d)
1473 {
1474         struct net_device *dev = to_net_dev(d);
1475
1476         return dev_net(dev);
1477 }
1478
1479 static struct class net_class = {
1480         .name = "net",
1481         .dev_release = netdev_release,
1482         .dev_groups = net_class_groups,
1483         .dev_uevent = netdev_uevent,
1484         .ns_type = &net_ns_type_operations,
1485         .namespace = net_namespace,
1486 };
1487
1488 #ifdef CONFIG_OF_NET
1489 static int of_dev_node_match(struct device *dev, const void *data)
1490 {
1491         int ret = 0;
1492
1493         if (dev->parent)
1494                 ret = dev->parent->of_node == data;
1495
1496         return ret == 0 ? dev->of_node == data : ret;
1497 }
1498
1499 /*
1500  * of_find_net_device_by_node - lookup the net device for the device node
1501  * @np: OF device node
1502  *
1503  * Looks up the net_device structure corresponding with the device node.
1504  * If successful, returns a pointer to the net_device with the embedded
1505  * struct device refcount incremented by one, or NULL on failure. The
1506  * refcount must be dropped when done with the net_device.
1507  */
1508 struct net_device *of_find_net_device_by_node(struct device_node *np)
1509 {
1510         struct device *dev;
1511
1512         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1513         if (!dev)
1514                 return NULL;
1515
1516         return to_net_dev(dev);
1517 }
1518 EXPORT_SYMBOL(of_find_net_device_by_node);
1519 #endif
1520
1521 /* Delete sysfs entries but hold kobject reference until after all
1522  * netdev references are gone.
1523  */
1524 void netdev_unregister_kobject(struct net_device *ndev)
1525 {
1526         struct device *dev = &(ndev->dev);
1527
1528         kobject_get(&dev->kobj);
1529
1530         remove_queue_kobjects(ndev);
1531
1532         pm_runtime_set_memalloc_noio(dev, false);
1533
1534         device_del(dev);
1535 }
1536
1537 /* Create sysfs entries for network device. */
1538 int netdev_register_kobject(struct net_device *ndev)
1539 {
1540         struct device *dev = &(ndev->dev);
1541         const struct attribute_group **groups = ndev->sysfs_groups;
1542         int error = 0;
1543
1544         device_initialize(dev);
1545         dev->class = &net_class;
1546         dev->platform_data = ndev;
1547         dev->groups = groups;
1548
1549         dev_set_name(dev, "%s", ndev->name);
1550
1551 #ifdef CONFIG_SYSFS
1552         /* Allow for a device specific group */
1553         if (*groups)
1554                 groups++;
1555
1556         *groups++ = &netstat_group;
1557
1558 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1559         if (ndev->ieee80211_ptr)
1560                 *groups++ = &wireless_group;
1561 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1562         else if (ndev->wireless_handlers)
1563                 *groups++ = &wireless_group;
1564 #endif
1565 #endif
1566 #endif /* CONFIG_SYSFS */
1567
1568         error = device_add(dev);
1569         if (error)
1570                 return error;
1571
1572         error = register_queue_kobjects(ndev);
1573         if (error) {
1574                 device_del(dev);
1575                 return error;
1576         }
1577
1578         pm_runtime_set_memalloc_noio(dev, true);
1579
1580         return error;
1581 }
1582
1583 int netdev_class_create_file_ns(struct class_attribute *class_attr,
1584                                 const void *ns)
1585 {
1586         return class_create_file_ns(&net_class, class_attr, ns);
1587 }
1588 EXPORT_SYMBOL(netdev_class_create_file_ns);
1589
1590 void netdev_class_remove_file_ns(struct class_attribute *class_attr,
1591                                  const void *ns)
1592 {
1593         class_remove_file_ns(&net_class, class_attr, ns);
1594 }
1595 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1596
1597 int __init netdev_kobject_init(void)
1598 {
1599         kobj_ns_type_register(&net_ns_type_operations);
1600         return class_register(&net_class);
1601 }