net/core/net-sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net-sysfs.c - network device class and attributes
   4  *
   5  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
   6  */
   7
   8 #include <linux/capability.h>
   9 #include <linux/kernel.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/if_arp.h>
  12 #include <linux/slab.h>
  13 #include <linux/sched/signal.h>
  14 #include <linux/nsproxy.h>
  15 #include <net/sock.h>
  16 #include <net/net_namespace.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/vmalloc.h>
  19 #include <linux/export.h>
  20 #include <linux/jiffies.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/of.h>
  23 #include <linux/of_net.h>
  24 #include <linux/cpu.h>
  25
  26 #include "net-sysfs.h"
  27
  28 #ifdef CONFIG_SYSFS
  29 static const char fmt_hex[] = "%#x\n";
  30 static const char fmt_dec[] = "%d\n";
  31 static const char fmt_ulong[] = "%lu\n";
  32 static const char fmt_u64[] = "%llu\n";
  33
  34 static inline int dev_isalive(const struct net_device *dev)
  35 {
  36         return dev->reg_state <= NETREG_REGISTERED;
  37 }
  38
  39 /* use same locking rules as GIF* ioctl's */
  40 static ssize_t netdev_show(const struct device *dev,
  41                            struct device_attribute *attr, char *buf,
  42                            ssize_t (*format)(const struct net_device *, char *))
  43 {
  44         struct net_device *ndev = to_net_dev(dev);
  45         ssize_t ret = -EINVAL;
  46
  47         read_lock(&dev_base_lock);
  48         if (dev_isalive(ndev))
  49                 ret = (*format)(ndev, buf);
  50         read_unlock(&dev_base_lock);
  51
  52         return ret;
  53 }
  54
  55 /* generate a show function for simple field */
  56 #define NETDEVICE_SHOW(field, format_string)                            \
  57 static ssize_t format_##field(const struct net_device *dev, char *buf)  \
  58 {                                                                       \
  59         return sprintf(buf, format_string, dev->field);                 \
  60 }                                                                       \
  61 static ssize_t field##_show(struct device *dev,                         \
  62                             struct device_attribute *attr, char *buf)   \
  63 {                                                                       \
  64         return netdev_show(dev, attr, buf, format_##field);             \
  65 }                                                                       \
  66
  67 #define NETDEVICE_SHOW_RO(field, format_string)                         \
  68 NETDEVICE_SHOW(field, format_string);                                   \
  69 static DEVICE_ATTR_RO(field)
  70
  71 #define NETDEVICE_SHOW_RW(field, format_string)                         \
  72 NETDEVICE_SHOW(field, format_string);                                   \
  73 static DEVICE_ATTR_RW(field)
  74
  75 /* use same locking and permission rules as SIF* ioctl's */
  76 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  77                             const char *buf, size_t len,
  78                             int (*set)(struct net_device *, unsigned long))
  79 {
  80         struct net_device *netdev = to_net_dev(dev);
  81         struct net *net = dev_net(netdev);
  82         unsigned long new;
  83         int ret = -EINVAL;
  84
  85         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  86                 return -EPERM;
  87
  88         ret = kstrtoul(buf, 0, &new);
  89         if (ret)
  90                 goto err;
  91
  92         if (!rtnl_trylock())
  93                 return restart_syscall();
  94
  95         if (dev_isalive(netdev)) {
  96                 ret = (*set)(netdev, new);
  97                 if (ret == 0)
  98                         ret = len;
  99         }
 100         rtnl_unlock();
 101  err:
 102         return ret;
 103 }
 104
 105 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 106 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 107 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 108 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 109 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 110 NETDEVICE_SHOW_RO(type, fmt_dec);
 111 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 112
 113 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
 114                            char *buf)
 115 {
 116         struct net_device *ndev = to_net_dev(dev);
 117
 118         return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
 119 }
 120 static DEVICE_ATTR_RO(iflink);
 121
 122 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 123 {
 124         return sprintf(buf, fmt_dec, dev->name_assign_type);
 125 }
 126
 127 static ssize_t name_assign_type_show(struct device *dev,
 128                                      struct device_attribute *attr,
 129                                      char *buf)
 130 {
 131         struct net_device *ndev = to_net_dev(dev);
 132         ssize_t ret = -EINVAL;
 133
 134         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
 135                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
 136
 137         return ret;
 138 }
 139 static DEVICE_ATTR_RO(name_assign_type);
 140
 141 /* use same locking rules as GIFHWADDR ioctl's */
 142 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 143                             char *buf)
 144 {
 145         struct net_device *ndev = to_net_dev(dev);
 146         ssize_t ret = -EINVAL;
 147
 148         read_lock(&dev_base_lock);
 149         if (dev_isalive(ndev))
 150                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 151         read_unlock(&dev_base_lock);
 152         return ret;
 153 }
 154 static DEVICE_ATTR_RO(address);
 155
 156 static ssize_t broadcast_show(struct device *dev,
 157                               struct device_attribute *attr, char *buf)
 158 {
 159         struct net_device *ndev = to_net_dev(dev);
 160
 161         if (dev_isalive(ndev))
 162                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
 163         return -EINVAL;
 164 }
 165 static DEVICE_ATTR_RO(broadcast);
 166
 167 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
 168 {
 169         if (!netif_running(dev))
 170                 return -EINVAL;
 171         return dev_change_carrier(dev, (bool)new_carrier);
 172 }
 173
 174 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 175                              const char *buf, size_t len)
 176 {
 177         return netdev_store(dev, attr, buf, len, change_carrier);
 178 }
 179
 180 static ssize_t carrier_show(struct device *dev,
 181                             struct device_attribute *attr, char *buf)
 182 {
 183         struct net_device *netdev = to_net_dev(dev);
 184
 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
 293         return sprintf(buf, fmt_dec,
 294                        atomic_read(&netdev->carrier_up_count) +
 295                        atomic_read(&netdev->carrier_down_count));
 296 }
 297 static DEVICE_ATTR_RO(carrier_changes);
 298
 299 static ssize_t carrier_up_count_show(struct device *dev,
 300                                      struct device_attribute *attr,
 301                                      char *buf)
 302 {
 303         struct net_device *netdev = to_net_dev(dev);
 304
 305         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
 306 }
 307 static DEVICE_ATTR_RO(carrier_up_count);
 308
 309 static ssize_t carrier_down_count_show(struct device *dev,
 310                                        struct device_attribute *attr,
 311                                        char *buf)
 312 {
 313         struct net_device *netdev = to_net_dev(dev);
 314
 315         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
 316 }
 317 static DEVICE_ATTR_RO(carrier_down_count);
 318
 319 /* read-write attributes */
 320
 321 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 322 {
 323         return dev_set_mtu(dev, (int)new_mtu);
 324 }
 325
 326 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 327                          const char *buf, size_t len)
 328 {
 329         return netdev_store(dev, attr, buf, len, change_mtu);
 330 }
 331 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 332
 333 static int change_flags(struct net_device *dev, unsigned long new_flags)
 334 {
 335         return dev_change_flags(dev, (unsigned int)new_flags, NULL);
 336 }
 337
 338 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 339                            const char *buf, size_t len)
 340 {
 341         return netdev_store(dev, attr, buf, len, change_flags);
 342 }
 343 NETDEVICE_SHOW_RW(flags, fmt_hex);
 344
 345 static ssize_t tx_queue_len_store(struct device *dev,
 346                                   struct device_attribute *attr,
 347                                   const char *buf, size_t len)
 348 {
 349         if (!capable(CAP_NET_ADMIN))
 350                 return -EPERM;
 351
 352         return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
 353 }
 354 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
 355
 356 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 357 {
 358         dev->gro_flush_timeout = val;
 359         return 0;
 360 }
 361
 362 static ssize_t gro_flush_timeout_store(struct device *dev,
 363                                        struct device_attribute *attr,
 364                                        const char *buf, size_t len)
 365 {
 366         if (!capable(CAP_NET_ADMIN))
 367                 return -EPERM;
 368
 369         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 370 }
 371 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 372
 373 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 374                              const char *buf, size_t len)
 375 {
 376         struct net_device *netdev = to_net_dev(dev);
 377         struct net *net = dev_net(netdev);
 378         size_t count = len;
 379         ssize_t ret = 0;
 380
 381         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 382                 return -EPERM;
 383
 384         /* ignore trailing newline */
 385         if (len >  0 && buf[len - 1] == '\n')
 386                 --count;
 387
 388         if (!rtnl_trylock())
 389                 return restart_syscall();
 390
 391         if (dev_isalive(netdev)) {
 392                 ret = dev_set_alias(netdev, buf, count);
 393                 if (ret < 0)
 394                         goto err;
 395                 ret = len;
 396                 netdev_state_change(netdev);
 397         }
 398 err:
 399         rtnl_unlock();
 400
 401         return ret;
 402 }
 403
 404 static ssize_t ifalias_show(struct device *dev,
 405                             struct device_attribute *attr, char *buf)
 406 {
 407         const struct net_device *netdev = to_net_dev(dev);
 408         char tmp[IFALIASZ];
 409         ssize_t ret = 0;
 410
 411         ret = dev_get_alias(netdev, tmp, sizeof(tmp));
 412         if (ret > 0)
 413                 ret = sprintf(buf, "%s\n", tmp);
 414         return ret;
 415 }
 416 static DEVICE_ATTR_RW(ifalias);
 417
 418 static int change_group(struct net_device *dev, unsigned long new_group)
 419 {
 420         dev_set_group(dev, (int)new_group);
 421         return 0;
 422 }
 423
 424 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 425                            const char *buf, size_t len)
 426 {
 427         return netdev_store(dev, attr, buf, len, change_group);
 428 }
 429 NETDEVICE_SHOW(group, fmt_dec);
 430 static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
 431
 432 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 433 {
 434         return dev_change_proto_down(dev, (bool)proto_down);
 435 }
 436
 437 static ssize_t proto_down_store(struct device *dev,
 438                                 struct device_attribute *attr,
 439                                 const char *buf, size_t len)
 440 {
 441         return netdev_store(dev, attr, buf, len, change_proto_down);
 442 }
 443 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 444
 445 static ssize_t phys_port_id_show(struct device *dev,
 446                                  struct device_attribute *attr, char *buf)
 447 {
 448         struct net_device *netdev = to_net_dev(dev);
 449         ssize_t ret = -EINVAL;
 450
 451         if (!rtnl_trylock())
 452                 return restart_syscall();
 453
 454         if (dev_isalive(netdev)) {
 455                 struct netdev_phys_item_id ppid;
 456
 457                 ret = dev_get_phys_port_id(netdev, &ppid);
 458                 if (!ret)
 459                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 460         }
 461         rtnl_unlock();
 462
 463         return ret;
 464 }
 465 static DEVICE_ATTR_RO(phys_port_id);
 466
 467 static ssize_t phys_port_name_show(struct device *dev,
 468                                    struct device_attribute *attr, char *buf)
 469 {
 470         struct net_device *netdev = to_net_dev(dev);
 471         ssize_t ret = -EINVAL;
 472
 473         if (!rtnl_trylock())
 474                 return restart_syscall();
 475
 476         if (dev_isalive(netdev)) {
 477                 char name[IFNAMSIZ];
 478
 479                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 480                 if (!ret)
 481                         ret = sprintf(buf, "%s\n", name);
 482         }
 483         rtnl_unlock();
 484
 485         return ret;
 486 }
 487 static DEVICE_ATTR_RO(phys_port_name);
 488
 489 static ssize_t phys_switch_id_show(struct device *dev,
 490                                    struct device_attribute *attr, char *buf)
 491 {
 492         struct net_device *netdev = to_net_dev(dev);
 493         ssize_t ret = -EINVAL;
 494
 495         if (!rtnl_trylock())
 496                 return restart_syscall();
 497
 498         if (dev_isalive(netdev)) {
 499                 struct netdev_phys_item_id ppid = { };
 500
 501                 ret = dev_get_port_parent_id(netdev, &ppid, false);
 502                 if (!ret)
 503                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 504         }
 505         rtnl_unlock();
 506
 507         return ret;
 508 }
 509 static DEVICE_ATTR_RO(phys_switch_id);
 510
 511 static struct attribute *net_class_attrs[] __ro_after_init = {
 512         &dev_attr_netdev_group.attr,
 513         &dev_attr_type.attr,
 514         &dev_attr_dev_id.attr,
 515         &dev_attr_dev_port.attr,
 516         &dev_attr_iflink.attr,
 517         &dev_attr_ifindex.attr,
 518         &dev_attr_name_assign_type.attr,
 519         &dev_attr_addr_assign_type.attr,
 520         &dev_attr_addr_len.attr,
 521         &dev_attr_link_mode.attr,
 522         &dev_attr_address.attr,
 523         &dev_attr_broadcast.attr,
 524         &dev_attr_speed.attr,
 525         &dev_attr_duplex.attr,
 526         &dev_attr_dormant.attr,
 527         &dev_attr_operstate.attr,
 528         &dev_attr_carrier_changes.attr,
 529         &dev_attr_ifalias.attr,
 530         &dev_attr_carrier.attr,
 531         &dev_attr_mtu.attr,
 532         &dev_attr_flags.attr,
 533         &dev_attr_tx_queue_len.attr,
 534         &dev_attr_gro_flush_timeout.attr,
 535         &dev_attr_phys_port_id.attr,
 536         &dev_attr_phys_port_name.attr,
 537         &dev_attr_phys_switch_id.attr,
 538         &dev_attr_proto_down.attr,
 539         &dev_attr_carrier_up_count.attr,
 540         &dev_attr_carrier_down_count.attr,
 541         NULL,
 542 };
 543 ATTRIBUTE_GROUPS(net_class);
 544
 545 /* Show a given an attribute in the statistics group */
 546 static ssize_t netstat_show(const struct device *d,
 547                             struct device_attribute *attr, char *buf,
 548                             unsigned long offset)
 549 {
 550         struct net_device *dev = to_net_dev(d);
 551         ssize_t ret = -EINVAL;
 552
 553         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 554                 offset % sizeof(u64) != 0);
 555
 556         read_lock(&dev_base_lock);
 557         if (dev_isalive(dev)) {
 558                 struct rtnl_link_stats64 temp;
 559                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 560
 561                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
 562         }
 563         read_unlock(&dev_base_lock);
 564         return ret;
 565 }
 566
 567 /* generate a read-only statistics attribute */
 568 #define NETSTAT_ENTRY(name)                                             \
 569 static ssize_t name##_show(struct device *d,                            \
 570                            struct device_attribute *attr, char *buf)    \
 571 {                                                                       \
 572         return netstat_show(d, attr, buf,                               \
 573                             offsetof(struct rtnl_link_stats64, name));  \
 574 }                                                                       \
 575 static DEVICE_ATTR_RO(name)
 576
 577 NETSTAT_ENTRY(rx_packets);
 578 NETSTAT_ENTRY(tx_packets);
 579 NETSTAT_ENTRY(rx_bytes);
 580 NETSTAT_ENTRY(tx_bytes);
 581 NETSTAT_ENTRY(rx_errors);
 582 NETSTAT_ENTRY(tx_errors);
 583 NETSTAT_ENTRY(rx_dropped);
 584 NETSTAT_ENTRY(tx_dropped);
 585 NETSTAT_ENTRY(multicast);
 586 NETSTAT_ENTRY(collisions);
 587 NETSTAT_ENTRY(rx_length_errors);
 588 NETSTAT_ENTRY(rx_over_errors);
 589 NETSTAT_ENTRY(rx_crc_errors);
 590 NETSTAT_ENTRY(rx_frame_errors);
 591 NETSTAT_ENTRY(rx_fifo_errors);
 592 NETSTAT_ENTRY(rx_missed_errors);
 593 NETSTAT_ENTRY(tx_aborted_errors);
 594 NETSTAT_ENTRY(tx_carrier_errors);
 595 NETSTAT_ENTRY(tx_fifo_errors);
 596 NETSTAT_ENTRY(tx_heartbeat_errors);
 597 NETSTAT_ENTRY(tx_window_errors);
 598 NETSTAT_ENTRY(rx_compressed);
 599 NETSTAT_ENTRY(tx_compressed);
 600 NETSTAT_ENTRY(rx_nohandler);
 601
 602 static struct attribute *netstat_attrs[] __ro_after_init = {
 603         &dev_attr_rx_packets.attr,
 604         &dev_attr_tx_packets.attr,
 605         &dev_attr_rx_bytes.attr,
 606         &dev_attr_tx_bytes.attr,
 607         &dev_attr_rx_errors.attr,
 608         &dev_attr_tx_errors.attr,
 609         &dev_attr_rx_dropped.attr,
 610         &dev_attr_tx_dropped.attr,
 611         &dev_attr_multicast.attr,
 612         &dev_attr_collisions.attr,
 613         &dev_attr_rx_length_errors.attr,
 614         &dev_attr_rx_over_errors.attr,
 615         &dev_attr_rx_crc_errors.attr,
 616         &dev_attr_rx_frame_errors.attr,
 617         &dev_attr_rx_fifo_errors.attr,
 618         &dev_attr_rx_missed_errors.attr,
 619         &dev_attr_tx_aborted_errors.attr,
 620         &dev_attr_tx_carrier_errors.attr,
 621         &dev_attr_tx_fifo_errors.attr,
 622         &dev_attr_tx_heartbeat_errors.attr,
 623         &dev_attr_tx_window_errors.attr,
 624         &dev_attr_rx_compressed.attr,
 625         &dev_attr_tx_compressed.attr,
 626         &dev_attr_rx_nohandler.attr,
 627         NULL
 628 };
 629
 630 static const struct attribute_group netstat_group = {
 631         .name  = "statistics",
 632         .attrs  = netstat_attrs,
 633 };
 634
 635 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 636 static struct attribute *wireless_attrs[] = {
 637         NULL
 638 };
 639
 640 static const struct attribute_group wireless_group = {
 641         .name = "wireless",
 642         .attrs = wireless_attrs,
 643 };
 644 #endif
 645
 646 #else /* CONFIG_SYSFS */
 647 #define net_class_groups        NULL
 648 #endif /* CONFIG_SYSFS */
 649
 650 #ifdef CONFIG_SYSFS
 651 #define to_rx_queue_attr(_attr) \
 652         container_of(_attr, struct rx_queue_attribute, attr)
 653
 654 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 655
 656 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 657                                   char *buf)
 658 {
 659         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 660         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 661
 662         if (!attribute->show)
 663                 return -EIO;
 664
 665         return attribute->show(queue, buf);
 666 }
 667
 668 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 669                                    const char *buf, size_t count)
 670 {
 671         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 672         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 673
 674         if (!attribute->store)
 675                 return -EIO;
 676
 677         return attribute->store(queue, buf, count);
 678 }
 679
 680 static const struct sysfs_ops rx_queue_sysfs_ops = {
 681         .show = rx_queue_attr_show,
 682         .store = rx_queue_attr_store,
 683 };
 684
 685 #ifdef CONFIG_RPS
 686 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
 687 {
 688         struct rps_map *map;
 689         cpumask_var_t mask;
 690         int i, len;
 691
 692         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 693                 return -ENOMEM;
 694
 695         rcu_read_lock();
 696         map = rcu_dereference(queue->rps_map);
 697         if (map)
 698                 for (i = 0; i < map->len; i++)
 699                         cpumask_set_cpu(map->cpus[i], mask);
 700
 701         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 702         rcu_read_unlock();
 703         free_cpumask_var(mask);
 704
 705         return len < PAGE_SIZE ? len : -EINVAL;
 706 }
 707
 708 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 709                              const char *buf, size_t len)
 710 {
 711         struct rps_map *old_map, *map;
 712         cpumask_var_t mask;
 713         int err, cpu, i;
 714         static DEFINE_MUTEX(rps_map_mutex);
 715
 716         if (!capable(CAP_NET_ADMIN))
 717                 return -EPERM;
 718
 719         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 720                 return -ENOMEM;
 721
 722         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 723         if (err) {
 724                 free_cpumask_var(mask);
 725                 return err;
 726         }
 727
 728         map = kzalloc(max_t(unsigned int,
 729                             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 730                       GFP_KERNEL);
 731         if (!map) {
 732                 free_cpumask_var(mask);
 733                 return -ENOMEM;
 734         }
 735
 736         i = 0;
 737         for_each_cpu_and(cpu, mask, cpu_online_mask)
 738                 map->cpus[i++] = cpu;
 739
 740         if (i) {
 741                 map->len = i;
 742         } else {
 743                 kfree(map);
 744                 map = NULL;
 745         }
 746
 747         mutex_lock(&rps_map_mutex);
 748         old_map = rcu_dereference_protected(queue->rps_map,
 749                                             mutex_is_locked(&rps_map_mutex));
 750         rcu_assign_pointer(queue->rps_map, map);
 751
 752         if (map)
 753                 static_branch_inc(&rps_needed);
 754         if (old_map)
 755                 static_branch_dec(&rps_needed);
 756
 757         mutex_unlock(&rps_map_mutex);
 758
 759         if (old_map)
 760                 kfree_rcu(old_map, rcu);
 761
 762         free_cpumask_var(mask);
 763         return len;
 764 }
 765
 766 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 767                                            char *buf)
 768 {
 769         struct rps_dev_flow_table *flow_table;
 770         unsigned long val = 0;
 771
 772         rcu_read_lock();
 773         flow_table = rcu_dereference(queue->rps_flow_table);
 774         if (flow_table)
 775                 val = (unsigned long)flow_table->mask + 1;
 776         rcu_read_unlock();
 777
 778         return sprintf(buf, "%lu\n", val);
 779 }
 780
 781 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 782 {
 783         struct rps_dev_flow_table *table = container_of(rcu,
 784             struct rps_dev_flow_table, rcu);
 785         vfree(table);
 786 }
 787
 788 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 789                                             const char *buf, size_t len)
 790 {
 791         unsigned long mask, count;
 792         struct rps_dev_flow_table *table, *old_table;
 793         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 794         int rc;
 795
 796         if (!capable(CAP_NET_ADMIN))
 797                 return -EPERM;
 798
 799         rc = kstrtoul(buf, 0, &count);
 800         if (rc < 0)
 801                 return rc;
 802
 803         if (count) {
 804                 mask = count - 1;
 805                 /* mask = roundup_pow_of_two(count) - 1;
 806                  * without overflows...
 807                  */
 808                 while ((mask | (mask >> 1)) != mask)
 809                         mask |= (mask >> 1);
 810                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 811                  * and on 32bit arches, must check
 812                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 813                  */
 814 #if BITS_PER_LONG > 32
 815                 if (mask > (unsigned long)(u32)mask)
 816                         return -EINVAL;
 817 #else
 818                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 819                                 / sizeof(struct rps_dev_flow)) {
 820                         /* Enforce a limit to prevent overflow */
 821                         return -EINVAL;
 822                 }
 823 #endif
 824                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 825                 if (!table)
 826                         return -ENOMEM;
 827
 828                 table->mask = mask;
 829                 for (count = 0; count <= mask; count++)
 830                         table->flows[count].cpu = RPS_NO_CPU;
 831         } else {
 832                 table = NULL;
 833         }
 834
 835         spin_lock(&rps_dev_flow_lock);
 836         old_table = rcu_dereference_protected(queue->rps_flow_table,
 837                                               lockdep_is_held(&rps_dev_flow_lock));
 838         rcu_assign_pointer(queue->rps_flow_table, table);
 839         spin_unlock(&rps_dev_flow_lock);
 840
 841         if (old_table)
 842                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 843
 844         return len;
 845 }
 846
 847 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
 848         = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
 849
 850 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
 851         = __ATTR(rps_flow_cnt, 0644,
 852                  show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 853 #endif /* CONFIG_RPS */
 854
 855 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
 856 #ifdef CONFIG_RPS
 857         &rps_cpus_attribute.attr,
 858         &rps_dev_flow_table_cnt_attribute.attr,
 859 #endif
 860         NULL
 861 };
 862 ATTRIBUTE_GROUPS(rx_queue_default);
 863
 864 static void rx_queue_release(struct kobject *kobj)
 865 {
 866         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 867 #ifdef CONFIG_RPS
 868         struct rps_map *map;
 869         struct rps_dev_flow_table *flow_table;
 870
 871         map = rcu_dereference_protected(queue->rps_map, 1);
 872         if (map) {
 873                 RCU_INIT_POINTER(queue->rps_map, NULL);
 874                 kfree_rcu(map, rcu);
 875         }
 876
 877         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 878         if (flow_table) {
 879                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 880                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 881         }
 882 #endif
 883
 884         memset(kobj, 0, sizeof(*kobj));
 885         dev_put(queue->dev);
 886 }
 887
 888 static const void *rx_queue_namespace(struct kobject *kobj)
 889 {
 890         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 891         struct device *dev = &queue->dev->dev;
 892         const void *ns = NULL;
 893
 894         if (dev->class && dev->class->ns_type)
 895                 ns = dev->class->namespace(dev);
 896
 897         return ns;
 898 }
 899
 900 static void rx_queue_get_ownership(struct kobject *kobj,
 901                                    kuid_t *uid, kgid_t *gid)
 902 {
 903         const struct net *net = rx_queue_namespace(kobj);
 904
 905         net_ns_get_ownership(net, uid, gid);
 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_groups = rx_queue_default_groups,
 912         .namespace = rx_queue_namespace,
 913         .get_ownership = rx_queue_get_ownership,
 914 };
 915
 916 static int rx_queue_add_kobject(struct net_device *dev, int index)
 917 {
 918         struct netdev_rx_queue *queue = dev->_rx + index;
 919         struct kobject *kobj = &queue->kobj;
 920         int error = 0;
 921
 922         /* Kobject_put later will trigger rx_queue_release call which
 923          * decreases dev refcount: Take that reference here
 924          */
 925         dev_hold(queue->dev);
 926
 927         kobj->kset = dev->queues_kset;
 928         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 929                                      "rx-%u", index);
 930         if (error)
 931                 goto err;
 932
 933         if (dev->sysfs_rx_queue_group) {
 934                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
 935                 if (error)
 936                         goto err;
 937         }
 938
 939         kobject_uevent(kobj, KOBJ_ADD);
 940
 941         return error;
 942
 943 err:
 944         kobject_put(kobj);
 945         return error;
 946 }
 947 #endif /* CONFIG_SYSFS */
 948
 949 int
 950 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
 951 {
 952 #ifdef CONFIG_SYSFS
 953         int i;
 954         int error = 0;
 955
 956 #ifndef CONFIG_RPS
 957         if (!dev->sysfs_rx_queue_group)
 958                 return 0;
 959 #endif
 960         for (i = old_num; i < new_num; i++) {
 961                 error = rx_queue_add_kobject(dev, i);
 962                 if (error) {
 963                         new_num = old_num;
 964                         break;
 965                 }
 966         }
 967
 968         while (--i >= new_num) {
 969                 struct kobject *kobj = &dev->_rx[i].kobj;
 970
 971                 if (!refcount_read(&dev_net(dev)->count))
 972                         kobj->uevent_suppress = 1;
 973                 if (dev->sysfs_rx_queue_group)
 974                         sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
 975                 kobject_put(kobj);
 976         }
 977
 978         return error;
 979 #else
 980         return 0;
 981 #endif
 982 }
 983
 984 #ifdef CONFIG_SYSFS
 985 /*
 986  * netdev_queue sysfs structures and functions.
 987  */
 988 struct netdev_queue_attribute {
 989         struct attribute attr;
 990         ssize_t (*show)(struct netdev_queue *queue, char *buf);
 991         ssize_t (*store)(struct netdev_queue *queue,
 992                          const char *buf, size_t len);
 993 };
 994 #define to_netdev_queue_attr(_attr) \
 995         container_of(_attr, struct netdev_queue_attribute, attr)
 996
 997 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 998
 999 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1000                                       struct attribute *attr, char *buf)
1001 {
1002         const struct netdev_queue_attribute *attribute
1003                 = to_netdev_queue_attr(attr);
1004         struct netdev_queue *queue = to_netdev_queue(kobj);
1005
1006         if (!attribute->show)
1007                 return -EIO;
1008
1009         return attribute->show(queue, buf);
1010 }
1011
1012 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1013                                        struct attribute *attr,
1014                                        const char *buf, size_t count)
1015 {
1016         const struct netdev_queue_attribute *attribute
1017                 = to_netdev_queue_attr(attr);
1018         struct netdev_queue *queue = to_netdev_queue(kobj);
1019
1020         if (!attribute->store)
1021                 return -EIO;
1022
1023         return attribute->store(queue, buf, count);
1024 }
1025
1026 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1027         .show = netdev_queue_attr_show,
1028         .store = netdev_queue_attr_store,
1029 };
1030
1031 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1032 {
1033         unsigned long trans_timeout;
1034
1035         spin_lock_irq(&queue->_xmit_lock);
1036         trans_timeout = queue->trans_timeout;
1037         spin_unlock_irq(&queue->_xmit_lock);
1038
1039         return sprintf(buf, "%lu", trans_timeout);
1040 }
1041
1042 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1043 {
1044         struct net_device *dev = queue->dev;
1045         unsigned int i;
1046
1047         i = queue - dev->_tx;
1048         BUG_ON(i >= dev->num_tx_queues);
1049
1050         return i;
1051 }
1052
1053 static ssize_t traffic_class_show(struct netdev_queue *queue,
1054                                   char *buf)
1055 {
1056         struct net_device *dev = queue->dev;
1057         int index;
1058         int tc;
1059
1060         if (!netif_is_multiqueue(dev))
1061                 return -ENOENT;
1062
1063         index = get_netdev_queue_index(queue);
1064
1065         /* If queue belongs to subordinate dev use its TC mapping */
1066         dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1067
1068         tc = netdev_txq_to_tc(dev, index);
1069         if (tc < 0)
1070                 return -EINVAL;
1071
1072         /* We can report the traffic class one of two ways:
1073          * Subordinate device traffic classes are reported with the traffic
1074          * class first, and then the subordinate class so for example TC0 on
1075          * subordinate device 2 will be reported as "0-2". If the queue
1076          * belongs to the root device it will be reported with just the
1077          * traffic class, so just "0" for TC 0 for example.
1078          */
1079         return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1080                                  sprintf(buf, "%u\n", tc);
1081 }
1082
1083 #ifdef CONFIG_XPS
1084 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1085                                char *buf)
1086 {
1087         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1088 }
1089
1090 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1091                                 const char *buf, size_t len)
1092 {
1093         struct net_device *dev = queue->dev;
1094         int err, index = get_netdev_queue_index(queue);
1095         u32 rate = 0;
1096
1097         if (!capable(CAP_NET_ADMIN))
1098                 return -EPERM;
1099
1100         err = kstrtou32(buf, 10, &rate);
1101         if (err < 0)
1102                 return err;
1103
1104         if (!rtnl_trylock())
1105                 return restart_syscall();
1106
1107         err = -EOPNOTSUPP;
1108         if (dev->netdev_ops->ndo_set_tx_maxrate)
1109                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1110
1111         rtnl_unlock();
1112         if (!err) {
1113                 queue->tx_maxrate = rate;
1114                 return len;
1115         }
1116         return err;
1117 }
1118
1119 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1120         = __ATTR_RW(tx_maxrate);
1121 #endif
1122
1123 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1124         = __ATTR_RO(tx_timeout);
1125
1126 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1127         = __ATTR_RO(traffic_class);
1128
1129 #ifdef CONFIG_BQL
1130 /*
1131  * Byte queue limits sysfs structures and functions.
1132  */
1133 static ssize_t bql_show(char *buf, unsigned int value)
1134 {
1135         return sprintf(buf, "%u\n", value);
1136 }
1137
1138 static ssize_t bql_set(const char *buf, const size_t count,
1139                        unsigned int *pvalue)
1140 {
1141         unsigned int value;
1142         int err;
1143
1144         if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1145                 value = DQL_MAX_LIMIT;
1146         } else {
1147                 err = kstrtouint(buf, 10, &value);
1148                 if (err < 0)
1149                         return err;
1150                 if (value > DQL_MAX_LIMIT)
1151                         return -EINVAL;
1152         }
1153
1154         *pvalue = value;
1155
1156         return count;
1157 }
1158
1159 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1160                                   char *buf)
1161 {
1162         struct dql *dql = &queue->dql;
1163
1164         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1165 }
1166
1167 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1168                                  const char *buf, size_t len)
1169 {
1170         struct dql *dql = &queue->dql;
1171         unsigned int value;
1172         int err;
1173
1174         err = kstrtouint(buf, 10, &value);
1175         if (err < 0)
1176                 return err;
1177
1178         dql->slack_hold_time = msecs_to_jiffies(value);
1179
1180         return len;
1181 }
1182
1183 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1184         = __ATTR(hold_time, 0644,
1185                  bql_show_hold_time, bql_set_hold_time);
1186
1187 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1188                                  char *buf)
1189 {
1190         struct dql *dql = &queue->dql;
1191
1192         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1193 }
1194
1195 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1196         __ATTR(inflight, 0444, bql_show_inflight, NULL);
1197
1198 #define BQL_ATTR(NAME, FIELD)                                           \
1199 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1200                                  char *buf)                             \
1201 {                                                                       \
1202         return bql_show(buf, queue->dql.FIELD);                         \
1203 }                                                                       \
1204                                                                         \
1205 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1206                                 const char *buf, size_t len)            \
1207 {                                                                       \
1208         return bql_set(buf, len, &queue->dql.FIELD);                    \
1209 }                                                                       \
1210                                                                         \
1211 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1212         = __ATTR(NAME, 0644,                            \
1213                  bql_show_ ## NAME, bql_set_ ## NAME)
1214
1215 BQL_ATTR(limit, limit);
1216 BQL_ATTR(limit_max, max_limit);
1217 BQL_ATTR(limit_min, min_limit);
1218
1219 static struct attribute *dql_attrs[] __ro_after_init = {
1220         &bql_limit_attribute.attr,
1221         &bql_limit_max_attribute.attr,
1222         &bql_limit_min_attribute.attr,
1223         &bql_hold_time_attribute.attr,
1224         &bql_inflight_attribute.attr,
1225         NULL
1226 };
1227
1228 static const struct attribute_group dql_group = {
1229         .name  = "byte_queue_limits",
1230         .attrs  = dql_attrs,
1231 };
1232 #endif /* CONFIG_BQL */
1233
1234 #ifdef CONFIG_XPS
1235 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1236                              char *buf)
1237 {
1238         struct net_device *dev = queue->dev;
1239         int cpu, len, num_tc = 1, tc = 0;
1240         struct xps_dev_maps *dev_maps;
1241         cpumask_var_t mask;
1242         unsigned long index;
1243
1244         if (!netif_is_multiqueue(dev))
1245                 return -ENOENT;
1246
1247         index = get_netdev_queue_index(queue);
1248
1249         if (dev->num_tc) {
1250                 /* Do not allow XPS on subordinate device directly */
1251                 num_tc = dev->num_tc;
1252                 if (num_tc < 0)
1253                         return -EINVAL;
1254
1255                 /* If queue belongs to subordinate dev use its map */
1256                 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1257
1258                 tc = netdev_txq_to_tc(dev, index);
1259                 if (tc < 0)
1260                         return -EINVAL;
1261         }
1262
1263         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1264                 return -ENOMEM;
1265
1266         rcu_read_lock();
1267         dev_maps = rcu_dereference(dev->xps_cpus_map);
1268         if (dev_maps) {
1269                 for_each_possible_cpu(cpu) {
1270                         int i, tci = cpu * num_tc + tc;
1271                         struct xps_map *map;
1272
1273                         map = rcu_dereference(dev_maps->attr_map[tci]);
1274                         if (!map)
1275                                 continue;
1276
1277                         for (i = map->len; i--;) {
1278                                 if (map->queues[i] == index) {
1279                                         cpumask_set_cpu(cpu, mask);
1280                                         break;
1281                                 }
1282                         }
1283                 }
1284         }
1285         rcu_read_unlock();
1286
1287         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1288         free_cpumask_var(mask);
1289         return len < PAGE_SIZE ? len : -EINVAL;
1290 }
1291
1292 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1293                               const char *buf, size_t len)
1294 {
1295         struct net_device *dev = queue->dev;
1296         unsigned long index;
1297         cpumask_var_t mask;
1298         int err;
1299
1300         if (!netif_is_multiqueue(dev))
1301                 return -ENOENT;
1302
1303         if (!capable(CAP_NET_ADMIN))
1304                 return -EPERM;
1305
1306         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1307                 return -ENOMEM;
1308
1309         index = get_netdev_queue_index(queue);
1310
1311         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1312         if (err) {
1313                 free_cpumask_var(mask);
1314                 return err;
1315         }
1316
1317         err = netif_set_xps_queue(dev, mask, index);
1318
1319         free_cpumask_var(mask);
1320
1321         return err ? : len;
1322 }
1323
1324 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1325         = __ATTR_RW(xps_cpus);
1326
1327 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1328 {
1329         struct net_device *dev = queue->dev;
1330         struct xps_dev_maps *dev_maps;
1331         unsigned long *mask, index;
1332         int j, len, num_tc = 1, tc = 0;
1333
1334         index = get_netdev_queue_index(queue);
1335
1336         if (dev->num_tc) {
1337                 num_tc = dev->num_tc;
1338                 tc = netdev_txq_to_tc(dev, index);
1339                 if (tc < 0)
1340                         return -EINVAL;
1341         }
1342         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1343         if (!mask)
1344                 return -ENOMEM;
1345
1346         rcu_read_lock();
1347         dev_maps = rcu_dereference(dev->xps_rxqs_map);
1348         if (!dev_maps)
1349                 goto out_no_maps;
1350
1351         for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1352              j < dev->num_rx_queues;) {
1353                 int i, tci = j * num_tc + tc;
1354                 struct xps_map *map;
1355
1356                 map = rcu_dereference(dev_maps->attr_map[tci]);
1357                 if (!map)
1358                         continue;
1359
1360                 for (i = map->len; i--;) {
1361                         if (map->queues[i] == index) {
1362                                 set_bit(j, mask);
1363                                 break;
1364                         }
1365                 }
1366         }
1367 out_no_maps:
1368         rcu_read_unlock();
1369
1370         len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1371         bitmap_free(mask);
1372
1373         return len < PAGE_SIZE ? len : -EINVAL;
1374 }
1375
1376 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1377                               size_t len)
1378 {
1379         struct net_device *dev = queue->dev;
1380         struct net *net = dev_net(dev);
1381         unsigned long *mask, index;
1382         int err;
1383
1384         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1385                 return -EPERM;
1386
1387         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1388         if (!mask)
1389                 return -ENOMEM;
1390
1391         index = get_netdev_queue_index(queue);
1392
1393         err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1394         if (err) {
1395                 bitmap_free(mask);
1396                 return err;
1397         }
1398
1399         cpus_read_lock();
1400         err = __netif_set_xps_queue(dev, mask, index, true);
1401         cpus_read_unlock();
1402
1403         bitmap_free(mask);
1404         return err ? : len;
1405 }
1406
1407 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1408         = __ATTR_RW(xps_rxqs);
1409 #endif /* CONFIG_XPS */
1410
1411 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1412         &queue_trans_timeout.attr,
1413         &queue_traffic_class.attr,
1414 #ifdef CONFIG_XPS
1415         &xps_cpus_attribute.attr,
1416         &xps_rxqs_attribute.attr,
1417         &queue_tx_maxrate.attr,
1418 #endif
1419         NULL
1420 };
1421 ATTRIBUTE_GROUPS(netdev_queue_default);
1422
1423 static void netdev_queue_release(struct kobject *kobj)
1424 {
1425         struct netdev_queue *queue = to_netdev_queue(kobj);
1426
1427         memset(kobj, 0, sizeof(*kobj));
1428         dev_put(queue->dev);
1429 }
1430
1431 static const void *netdev_queue_namespace(struct kobject *kobj)
1432 {
1433         struct netdev_queue *queue = to_netdev_queue(kobj);
1434         struct device *dev = &queue->dev->dev;
1435         const void *ns = NULL;
1436
1437         if (dev->class && dev->class->ns_type)
1438                 ns = dev->class->namespace(dev);
1439
1440         return ns;
1441 }
1442
1443 static void netdev_queue_get_ownership(struct kobject *kobj,
1444                                        kuid_t *uid, kgid_t *gid)
1445 {
1446         const struct net *net = netdev_queue_namespace(kobj);
1447
1448         net_ns_get_ownership(net, uid, gid);
1449 }
1450
1451 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1452         .sysfs_ops = &netdev_queue_sysfs_ops,
1453         .release = netdev_queue_release,
1454         .default_groups = netdev_queue_default_groups,
1455         .namespace = netdev_queue_namespace,
1456         .get_ownership = netdev_queue_get_ownership,
1457 };
1458
1459 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1460 {
1461         struct netdev_queue *queue = dev->_tx + index;
1462         struct kobject *kobj = &queue->kobj;
1463         int error = 0;
1464
1465         /* Kobject_put later will trigger netdev_queue_release call
1466          * which decreases dev refcount: Take that reference here
1467          */
1468         dev_hold(queue->dev);
1469
1470         kobj->kset = dev->queues_kset;
1471         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1472                                      "tx-%u", index);
1473         if (error)
1474                 goto err;
1475
1476 #ifdef CONFIG_BQL
1477         error = sysfs_create_group(kobj, &dql_group);
1478         if (error)
1479                 goto err;
1480 #endif
1481
1482         kobject_uevent(kobj, KOBJ_ADD);
1483         return 0;
1484
1485 err:
1486         kobject_put(kobj);
1487         return error;
1488 }
1489 #endif /* CONFIG_SYSFS */
1490
1491 int
1492 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1493 {
1494 #ifdef CONFIG_SYSFS
1495         int i;
1496         int error = 0;
1497
1498         for (i = old_num; i < new_num; i++) {
1499                 error = netdev_queue_add_kobject(dev, i);
1500                 if (error) {
1501                         new_num = old_num;
1502                         break;
1503                 }
1504         }
1505
1506         while (--i >= new_num) {
1507                 struct netdev_queue *queue = dev->_tx + i;
1508
1509                 if (!refcount_read(&dev_net(dev)->count))
1510                         queue->kobj.uevent_suppress = 1;
1511 #ifdef CONFIG_BQL
1512                 sysfs_remove_group(&queue->kobj, &dql_group);
1513 #endif
1514                 kobject_put(&queue->kobj);
1515         }
1516
1517         return error;
1518 #else
1519         return 0;
1520 #endif /* CONFIG_SYSFS */
1521 }
1522
1523 static int register_queue_kobjects(struct net_device *dev)
1524 {
1525         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1526
1527 #ifdef CONFIG_SYSFS
1528         dev->queues_kset = kset_create_and_add("queues",
1529                                                NULL, &dev->dev.kobj);
1530         if (!dev->queues_kset)
1531                 return -ENOMEM;
1532         real_rx = dev->real_num_rx_queues;
1533 #endif
1534         real_tx = dev->real_num_tx_queues;
1535
1536         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1537         if (error)
1538                 goto error;
1539         rxq = real_rx;
1540
1541         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1542         if (error)
1543                 goto error;
1544         txq = real_tx;
1545
1546         return 0;
1547
1548 error:
1549         netdev_queue_update_kobjects(dev, txq, 0);
1550         net_rx_queue_update_kobjects(dev, rxq, 0);
1551 #ifdef CONFIG_SYSFS
1552         kset_unregister(dev->queues_kset);
1553 #endif
1554         return error;
1555 }
1556
1557 static void remove_queue_kobjects(struct net_device *dev)
1558 {
1559         int real_rx = 0, real_tx = 0;
1560
1561 #ifdef CONFIG_SYSFS
1562         real_rx = dev->real_num_rx_queues;
1563 #endif
1564         real_tx = dev->real_num_tx_queues;
1565
1566         net_rx_queue_update_kobjects(dev, real_rx, 0);
1567         netdev_queue_update_kobjects(dev, real_tx, 0);
1568 #ifdef CONFIG_SYSFS
1569         kset_unregister(dev->queues_kset);
1570 #endif
1571 }
1572
1573 static bool net_current_may_mount(void)
1574 {
1575         struct net *net = current->nsproxy->net_ns;
1576
1577         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1578 }
1579
1580 static void *net_grab_current_ns(void)
1581 {
1582         struct net *ns = current->nsproxy->net_ns;
1583 #ifdef CONFIG_NET_NS
1584         if (ns)
1585                 refcount_inc(&ns->passive);
1586 #endif
1587         return ns;
1588 }
1589
1590 static const void *net_initial_ns(void)
1591 {
1592         return &init_net;
1593 }
1594
1595 static const void *net_netlink_ns(struct sock *sk)
1596 {
1597         return sock_net(sk);
1598 }
1599
1600 const struct kobj_ns_type_operations net_ns_type_operations = {
1601         .type = KOBJ_NS_TYPE_NET,
1602         .current_may_mount = net_current_may_mount,
1603         .grab_current_ns = net_grab_current_ns,
1604         .netlink_ns = net_netlink_ns,
1605         .initial_ns = net_initial_ns,
1606         .drop_ns = net_drop_ns,
1607 };
1608 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1609
1610 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1611 {
1612         struct net_device *dev = to_net_dev(d);
1613         int retval;
1614
1615         /* pass interface to uevent. */
1616         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1617         if (retval)
1618                 goto exit;
1619
1620         /* pass ifindex to uevent.
1621          * ifindex is useful as it won't change (interface name may change)
1622          * and is what RtNetlink uses natively.
1623          */
1624         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1625
1626 exit:
1627         return retval;
1628 }
1629
1630 /*
1631  *      netdev_release -- destroy and free a dead device.
1632  *      Called when last reference to device kobject is gone.
1633  */
1634 static void netdev_release(struct device *d)
1635 {
1636         struct net_device *dev = to_net_dev(d);
1637
1638         BUG_ON(dev->reg_state != NETREG_RELEASED);
1639
1640         /* no need to wait for rcu grace period:
1641          * device is dead and about to be freed.
1642          */
1643         kfree(rcu_access_pointer(dev->ifalias));
1644         netdev_freemem(dev);
1645 }
1646
1647 static const void *net_namespace(struct device *d)
1648 {
1649         struct net_device *dev = to_net_dev(d);
1650
1651         return dev_net(dev);
1652 }
1653
1654 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1655 {
1656         struct net_device *dev = to_net_dev(d);
1657         const struct net *net = dev_net(dev);
1658
1659         net_ns_get_ownership(net, uid, gid);
1660 }
1661
1662 static struct class net_class __ro_after_init = {
1663         .name = "net",
1664         .dev_release = netdev_release,
1665         .dev_groups = net_class_groups,
1666         .dev_uevent = netdev_uevent,
1667         .ns_type = &net_ns_type_operations,
1668         .namespace = net_namespace,
1669         .get_ownership = net_get_ownership,
1670 };
1671
1672 #ifdef CONFIG_OF_NET
1673 static int of_dev_node_match(struct device *dev, const void *data)
1674 {
1675         int ret = 0;
1676
1677         if (dev->parent)
1678                 ret = dev->parent->of_node == data;
1679
1680         return ret == 0 ? dev->of_node == data : ret;
1681 }
1682
1683 /*
1684  * of_find_net_device_by_node - lookup the net device for the device node
1685  * @np: OF device node
1686  *
1687  * Looks up the net_device structure corresponding with the device node.
1688  * If successful, returns a pointer to the net_device with the embedded
1689  * struct device refcount incremented by one, or NULL on failure. The
1690  * refcount must be dropped when done with the net_device.
1691  */
1692 struct net_device *of_find_net_device_by_node(struct device_node *np)
1693 {
1694         struct device *dev;
1695
1696         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1697         if (!dev)
1698                 return NULL;
1699
1700         return to_net_dev(dev);
1701 }
1702 EXPORT_SYMBOL(of_find_net_device_by_node);
1703 #endif
1704
1705 /* Delete sysfs entries but hold kobject reference until after all
1706  * netdev references are gone.
1707  */
1708 void netdev_unregister_kobject(struct net_device *ndev)
1709 {
1710         struct device *dev = &ndev->dev;
1711
1712         if (!refcount_read(&dev_net(ndev)->count))
1713                 dev_set_uevent_suppress(dev, 1);
1714
1715         kobject_get(&dev->kobj);
1716
1717         remove_queue_kobjects(ndev);
1718
1719         pm_runtime_set_memalloc_noio(dev, false);
1720
1721         device_del(dev);
1722 }
1723
1724 /* Create sysfs entries for network device. */
1725 int netdev_register_kobject(struct net_device *ndev)
1726 {
1727         struct device *dev = &ndev->dev;
1728         const struct attribute_group **groups = ndev->sysfs_groups;
1729         int error = 0;
1730
1731         device_initialize(dev);
1732         dev->class = &net_class;
1733         dev->platform_data = ndev;
1734         dev->groups = groups;
1735
1736         dev_set_name(dev, "%s", ndev->name);
1737
1738 #ifdef CONFIG_SYSFS
1739         /* Allow for a device specific group */
1740         if (*groups)
1741                 groups++;
1742
1743         *groups++ = &netstat_group;
1744
1745 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1746         if (ndev->ieee80211_ptr)
1747                 *groups++ = &wireless_group;
1748 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1749         else if (ndev->wireless_handlers)
1750                 *groups++ = &wireless_group;
1751 #endif
1752 #endif
1753 #endif /* CONFIG_SYSFS */
1754
1755         error = device_add(dev);
1756         if (error)
1757                 return error;
1758
1759         error = register_queue_kobjects(ndev);
1760         if (error) {
1761                 device_del(dev);
1762                 return error;
1763         }
1764
1765         pm_runtime_set_memalloc_noio(dev, true);
1766
1767         return error;
1768 }
1769
1770 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1771                                 const void *ns)
1772 {
1773         return class_create_file_ns(&net_class, class_attr, ns);
1774 }
1775 EXPORT_SYMBOL(netdev_class_create_file_ns);
1776
1777 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1778                                  const void *ns)
1779 {
1780         class_remove_file_ns(&net_class, class_attr, ns);
1781 }
1782 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1783
1784 int __init netdev_kobject_init(void)
1785 {
1786         kobj_ns_type_register(&net_ns_type_operations);
1787         return class_register(&net_class);
1788 }