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 <linux/if_arp.h>
  16 #include <linux/slab.h>
  17 #include <linux/sched/signal.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 #include <linux/cpu.h>
  29
  30 #include "net-sysfs.h"
  31
  32 #ifdef CONFIG_SYSFS
  33 static const char fmt_hex[] = "%#x\n";
  34 static const char fmt_dec[] = "%d\n";
  35 static const char fmt_ulong[] = "%lu\n";
  36 static const char fmt_u64[] = "%llu\n";
  37
  38 static inline int dev_isalive(const struct net_device *dev)
  39 {
  40         return dev->reg_state <= NETREG_REGISTERED;
  41 }
  42
  43 /* use same locking rules as GIF* ioctl's */
  44 static ssize_t netdev_show(const struct device *dev,
  45                            struct device_attribute *attr, char *buf,
  46                            ssize_t (*format)(const struct net_device *, char *))
  47 {
  48         struct net_device *ndev = to_net_dev(dev);
  49         ssize_t ret = -EINVAL;
  50
  51         read_lock(&dev_base_lock);
  52         if (dev_isalive(ndev))
  53                 ret = (*format)(ndev, buf);
  54         read_unlock(&dev_base_lock);
  55
  56         return ret;
  57 }
  58
  59 /* generate a show function for simple field */
  60 #define NETDEVICE_SHOW(field, format_string)                            \
  61 static ssize_t format_##field(const struct net_device *dev, char *buf)  \
  62 {                                                                       \
  63         return sprintf(buf, format_string, dev->field);                 \
  64 }                                                                       \
  65 static ssize_t field##_show(struct device *dev,                         \
  66                             struct device_attribute *attr, char *buf)   \
  67 {                                                                       \
  68         return netdev_show(dev, attr, buf, format_##field);             \
  69 }                                                                       \
  70
  71 #define NETDEVICE_SHOW_RO(field, format_string)                         \
  72 NETDEVICE_SHOW(field, format_string);                                   \
  73 static DEVICE_ATTR_RO(field)
  74
  75 #define NETDEVICE_SHOW_RW(field, format_string)                         \
  76 NETDEVICE_SHOW(field, format_string);                                   \
  77 static DEVICE_ATTR_RW(field)
  78
  79 /* use same locking and permission rules as SIF* ioctl's */
  80 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  81                             const char *buf, size_t len,
  82                             int (*set)(struct net_device *, unsigned long))
  83 {
  84         struct net_device *netdev = to_net_dev(dev);
  85         struct net *net = dev_net(netdev);
  86         unsigned long new;
  87         int ret = -EINVAL;
  88
  89         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  90                 return -EPERM;
  91
  92         ret = kstrtoul(buf, 0, &new);
  93         if (ret)
  94                 goto err;
  95
  96         if (!rtnl_trylock())
  97                 return restart_syscall();
  98
  99         if (dev_isalive(netdev)) {
 100                 ret = (*set)(netdev, new);
 101                 if (ret == 0)
 102                         ret = len;
 103         }
 104         rtnl_unlock();
 105  err:
 106         return ret;
 107 }
 108
 109 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 110 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 111 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 112 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 113 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 114 NETDEVICE_SHOW_RO(type, fmt_dec);
 115 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 116
 117 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
 118                            char *buf)
 119 {
 120         struct net_device *ndev = to_net_dev(dev);
 121
 122         return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
 123 }
 124 static DEVICE_ATTR_RO(iflink);
 125
 126 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 127 {
 128         return sprintf(buf, fmt_dec, dev->name_assign_type);
 129 }
 130
 131 static ssize_t name_assign_type_show(struct device *dev,
 132                                      struct device_attribute *attr,
 133                                      char *buf)
 134 {
 135         struct net_device *ndev = to_net_dev(dev);
 136         ssize_t ret = -EINVAL;
 137
 138         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
 139                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
 140
 141         return ret;
 142 }
 143 static DEVICE_ATTR_RO(name_assign_type);
 144
 145 /* use same locking rules as GIFHWADDR ioctl's */
 146 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 147                             char *buf)
 148 {
 149         struct net_device *ndev = to_net_dev(dev);
 150         ssize_t ret = -EINVAL;
 151
 152         read_lock(&dev_base_lock);
 153         if (dev_isalive(ndev))
 154                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 155         read_unlock(&dev_base_lock);
 156         return ret;
 157 }
 158 static DEVICE_ATTR_RO(address);
 159
 160 static ssize_t broadcast_show(struct device *dev,
 161                               struct device_attribute *attr, char *buf)
 162 {
 163         struct net_device *ndev = to_net_dev(dev);
 164
 165         if (dev_isalive(ndev))
 166                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
 167         return -EINVAL;
 168 }
 169 static DEVICE_ATTR_RO(broadcast);
 170
 171 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
 172 {
 173         if (!netif_running(dev))
 174                 return -EINVAL;
 175         return dev_change_carrier(dev, (bool)new_carrier);
 176 }
 177
 178 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 179                              const char *buf, size_t len)
 180 {
 181         return netdev_store(dev, attr, buf, len, change_carrier);
 182 }
 183
 184 static ssize_t carrier_show(struct device *dev,
 185                             struct device_attribute *attr, char *buf)
 186 {
 187         struct net_device *netdev = to_net_dev(dev);
 188
 189         if (netif_running(netdev))
 190                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 191
 192         return -EINVAL;
 193 }
 194 static DEVICE_ATTR_RW(carrier);
 195
 196 static ssize_t speed_show(struct device *dev,
 197                           struct device_attribute *attr, char *buf)
 198 {
 199         struct net_device *netdev = to_net_dev(dev);
 200         int ret = -EINVAL;
 201
 202         if (!rtnl_trylock())
 203                 return restart_syscall();
 204
 205         if (netif_running(netdev)) {
 206                 struct ethtool_link_ksettings cmd;
 207
 208                 if (!__ethtool_get_link_ksettings(netdev, &cmd))
 209                         ret = sprintf(buf, fmt_dec, cmd.base.speed);
 210         }
 211         rtnl_unlock();
 212         return ret;
 213 }
 214 static DEVICE_ATTR_RO(speed);
 215
 216 static ssize_t duplex_show(struct device *dev,
 217                            struct device_attribute *attr, char *buf)
 218 {
 219         struct net_device *netdev = to_net_dev(dev);
 220         int ret = -EINVAL;
 221
 222         if (!rtnl_trylock())
 223                 return restart_syscall();
 224
 225         if (netif_running(netdev)) {
 226                 struct ethtool_link_ksettings cmd;
 227
 228                 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
 229                         const char *duplex;
 230
 231                         switch (cmd.base.duplex) {
 232                         case DUPLEX_HALF:
 233                                 duplex = "half";
 234                                 break;
 235                         case DUPLEX_FULL:
 236                                 duplex = "full";
 237                                 break;
 238                         default:
 239                                 duplex = "unknown";
 240                                 break;
 241                         }
 242                         ret = sprintf(buf, "%s\n", duplex);
 243                 }
 244         }
 245         rtnl_unlock();
 246         return ret;
 247 }
 248 static DEVICE_ATTR_RO(duplex);
 249
 250 static ssize_t dormant_show(struct device *dev,
 251                             struct device_attribute *attr, char *buf)
 252 {
 253         struct net_device *netdev = to_net_dev(dev);
 254
 255         if (netif_running(netdev))
 256                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 257
 258         return -EINVAL;
 259 }
 260 static DEVICE_ATTR_RO(dormant);
 261
 262 static const char *const operstates[] = {
 263         "unknown",
 264         "notpresent", /* currently unused */
 265         "down",
 266         "lowerlayerdown",
 267         "testing", /* currently unused */
 268         "dormant",
 269         "up"
 270 };
 271
 272 static ssize_t operstate_show(struct device *dev,
 273                               struct device_attribute *attr, char *buf)
 274 {
 275         const struct net_device *netdev = to_net_dev(dev);
 276         unsigned char operstate;
 277
 278         read_lock(&dev_base_lock);
 279         operstate = netdev->operstate;
 280         if (!netif_running(netdev))
 281                 operstate = IF_OPER_DOWN;
 282         read_unlock(&dev_base_lock);
 283
 284         if (operstate >= ARRAY_SIZE(operstates))
 285                 return -EINVAL; /* should not happen */
 286
 287         return sprintf(buf, "%s\n", operstates[operstate]);
 288 }
 289 static DEVICE_ATTR_RO(operstate);
 290
 291 static ssize_t carrier_changes_show(struct device *dev,
 292                                     struct device_attribute *attr,
 293                                     char *buf)
 294 {
 295         struct net_device *netdev = to_net_dev(dev);
 296
 297         return sprintf(buf, fmt_dec,
 298                        atomic_read(&netdev->carrier_up_count) +
 299                        atomic_read(&netdev->carrier_down_count));
 300 }
 301 static DEVICE_ATTR_RO(carrier_changes);
 302
 303 static ssize_t carrier_up_count_show(struct device *dev,
 304                                      struct device_attribute *attr,
 305                                      char *buf)
 306 {
 307         struct net_device *netdev = to_net_dev(dev);
 308
 309         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
 310 }
 311 static DEVICE_ATTR_RO(carrier_up_count);
 312
 313 static ssize_t carrier_down_count_show(struct device *dev,
 314                                        struct device_attribute *attr,
 315                                        char *buf)
 316 {
 317         struct net_device *netdev = to_net_dev(dev);
 318
 319         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
 320 }
 321 static DEVICE_ATTR_RO(carrier_down_count);
 322
 323 /* read-write attributes */
 324
 325 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 326 {
 327         return dev_set_mtu(dev, (int)new_mtu);
 328 }
 329
 330 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 331                          const char *buf, size_t len)
 332 {
 333         return netdev_store(dev, attr, buf, len, change_mtu);
 334 }
 335 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 336
 337 static int change_flags(struct net_device *dev, unsigned long new_flags)
 338 {
 339         return dev_change_flags(dev, (unsigned int)new_flags, NULL);
 340 }
 341
 342 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 343                            const char *buf, size_t len)
 344 {
 345         return netdev_store(dev, attr, buf, len, change_flags);
 346 }
 347 NETDEVICE_SHOW_RW(flags, fmt_hex);
 348
 349 static ssize_t tx_queue_len_store(struct device *dev,
 350                                   struct device_attribute *attr,
 351                                   const char *buf, size_t len)
 352 {
 353         if (!capable(CAP_NET_ADMIN))
 354                 return -EPERM;
 355
 356         return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
 357 }
 358 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
 359
 360 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 361 {
 362         dev->gro_flush_timeout = val;
 363         return 0;
 364 }
 365
 366 static ssize_t gro_flush_timeout_store(struct device *dev,
 367                                        struct device_attribute *attr,
 368                                        const char *buf, size_t len)
 369 {
 370         if (!capable(CAP_NET_ADMIN))
 371                 return -EPERM;
 372
 373         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 374 }
 375 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 376
 377 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 378                              const char *buf, size_t len)
 379 {
 380         struct net_device *netdev = to_net_dev(dev);
 381         struct net *net = dev_net(netdev);
 382         size_t count = len;
 383         ssize_t ret = 0;
 384
 385         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 386                 return -EPERM;
 387
 388         /* ignore trailing newline */
 389         if (len >  0 && buf[len - 1] == '\n')
 390                 --count;
 391
 392         if (!rtnl_trylock())
 393                 return restart_syscall();
 394
 395         if (dev_isalive(netdev)) {
 396                 ret = dev_set_alias(netdev, buf, count);
 397                 if (ret < 0)
 398                         goto err;
 399                 ret = len;
 400                 netdev_state_change(netdev);
 401         }
 402 err:
 403         rtnl_unlock();
 404
 405         return ret;
 406 }
 407
 408 static ssize_t ifalias_show(struct device *dev,
 409                             struct device_attribute *attr, char *buf)
 410 {
 411         const struct net_device *netdev = to_net_dev(dev);
 412         char tmp[IFALIASZ];
 413         ssize_t ret = 0;
 414
 415         ret = dev_get_alias(netdev, tmp, sizeof(tmp));
 416         if (ret > 0)
 417                 ret = sprintf(buf, "%s\n", tmp);
 418         return ret;
 419 }
 420 static DEVICE_ATTR_RW(ifalias);
 421
 422 static int change_group(struct net_device *dev, unsigned long new_group)
 423 {
 424         dev_set_group(dev, (int)new_group);
 425         return 0;
 426 }
 427
 428 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 429                            const char *buf, size_t len)
 430 {
 431         return netdev_store(dev, attr, buf, len, change_group);
 432 }
 433 NETDEVICE_SHOW(group, fmt_dec);
 434 static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
 435
 436 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 437 {
 438         return dev_change_proto_down(dev, (bool)proto_down);
 439 }
 440
 441 static ssize_t proto_down_store(struct device *dev,
 442                                 struct device_attribute *attr,
 443                                 const char *buf, size_t len)
 444 {
 445         return netdev_store(dev, attr, buf, len, change_proto_down);
 446 }
 447 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 448
 449 static ssize_t phys_port_id_show(struct device *dev,
 450                                  struct device_attribute *attr, char *buf)
 451 {
 452         struct net_device *netdev = to_net_dev(dev);
 453         ssize_t ret = -EINVAL;
 454
 455         if (!rtnl_trylock())
 456                 return restart_syscall();
 457
 458         if (dev_isalive(netdev)) {
 459                 struct netdev_phys_item_id ppid;
 460
 461                 ret = dev_get_phys_port_id(netdev, &ppid);
 462                 if (!ret)
 463                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 464         }
 465         rtnl_unlock();
 466
 467         return ret;
 468 }
 469 static DEVICE_ATTR_RO(phys_port_id);
 470
 471 static ssize_t phys_port_name_show(struct device *dev,
 472                                    struct device_attribute *attr, char *buf)
 473 {
 474         struct net_device *netdev = to_net_dev(dev);
 475         ssize_t ret = -EINVAL;
 476
 477         if (!rtnl_trylock())
 478                 return restart_syscall();
 479
 480         if (dev_isalive(netdev)) {
 481                 char name[IFNAMSIZ];
 482
 483                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 484                 if (!ret)
 485                         ret = sprintf(buf, "%s\n", name);
 486         }
 487         rtnl_unlock();
 488
 489         return ret;
 490 }
 491 static DEVICE_ATTR_RO(phys_port_name);
 492
 493 static ssize_t phys_switch_id_show(struct device *dev,
 494                                    struct device_attribute *attr, char *buf)
 495 {
 496         struct net_device *netdev = to_net_dev(dev);
 497         ssize_t ret = -EINVAL;
 498
 499         if (!rtnl_trylock())
 500                 return restart_syscall();
 501
 502         if (dev_isalive(netdev)) {
 503                 struct netdev_phys_item_id ppid = { };
 504
 505                 ret = dev_get_port_parent_id(netdev, &ppid, false);
 506                 if (!ret)
 507                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 508         }
 509         rtnl_unlock();
 510
 511         return ret;
 512 }
 513 static DEVICE_ATTR_RO(phys_switch_id);
 514
 515 static struct attribute *net_class_attrs[] __ro_after_init = {
 516         &dev_attr_netdev_group.attr,
 517         &dev_attr_type.attr,
 518         &dev_attr_dev_id.attr,
 519         &dev_attr_dev_port.attr,
 520         &dev_attr_iflink.attr,
 521         &dev_attr_ifindex.attr,
 522         &dev_attr_name_assign_type.attr,
 523         &dev_attr_addr_assign_type.attr,
 524         &dev_attr_addr_len.attr,
 525         &dev_attr_link_mode.attr,
 526         &dev_attr_address.attr,
 527         &dev_attr_broadcast.attr,
 528         &dev_attr_speed.attr,
 529         &dev_attr_duplex.attr,
 530         &dev_attr_dormant.attr,
 531         &dev_attr_operstate.attr,
 532         &dev_attr_carrier_changes.attr,
 533         &dev_attr_ifalias.attr,
 534         &dev_attr_carrier.attr,
 535         &dev_attr_mtu.attr,
 536         &dev_attr_flags.attr,
 537         &dev_attr_tx_queue_len.attr,
 538         &dev_attr_gro_flush_timeout.attr,
 539         &dev_attr_phys_port_id.attr,
 540         &dev_attr_phys_port_name.attr,
 541         &dev_attr_phys_switch_id.attr,
 542         &dev_attr_proto_down.attr,
 543         &dev_attr_carrier_up_count.attr,
 544         &dev_attr_carrier_down_count.attr,
 545         NULL,
 546 };
 547 ATTRIBUTE_GROUPS(net_class);
 548
 549 /* Show a given an attribute in the statistics group */
 550 static ssize_t netstat_show(const struct device *d,
 551                             struct device_attribute *attr, char *buf,
 552                             unsigned long offset)
 553 {
 554         struct net_device *dev = to_net_dev(d);
 555         ssize_t ret = -EINVAL;
 556
 557         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 558                 offset % sizeof(u64) != 0);
 559
 560         read_lock(&dev_base_lock);
 561         if (dev_isalive(dev)) {
 562                 struct rtnl_link_stats64 temp;
 563                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 564
 565                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
 566         }
 567         read_unlock(&dev_base_lock);
 568         return ret;
 569 }
 570
 571 /* generate a read-only statistics attribute */
 572 #define NETSTAT_ENTRY(name)                                             \
 573 static ssize_t name##_show(struct device *d,                            \
 574                            struct device_attribute *attr, char *buf)    \
 575 {                                                                       \
 576         return netstat_show(d, attr, buf,                               \
 577                             offsetof(struct rtnl_link_stats64, name));  \
 578 }                                                                       \
 579 static DEVICE_ATTR_RO(name)
 580
 581 NETSTAT_ENTRY(rx_packets);
 582 NETSTAT_ENTRY(tx_packets);
 583 NETSTAT_ENTRY(rx_bytes);
 584 NETSTAT_ENTRY(tx_bytes);
 585 NETSTAT_ENTRY(rx_errors);
 586 NETSTAT_ENTRY(tx_errors);
 587 NETSTAT_ENTRY(rx_dropped);
 588 NETSTAT_ENTRY(tx_dropped);
 589 NETSTAT_ENTRY(multicast);
 590 NETSTAT_ENTRY(collisions);
 591 NETSTAT_ENTRY(rx_length_errors);
 592 NETSTAT_ENTRY(rx_over_errors);
 593 NETSTAT_ENTRY(rx_crc_errors);
 594 NETSTAT_ENTRY(rx_frame_errors);
 595 NETSTAT_ENTRY(rx_fifo_errors);
 596 NETSTAT_ENTRY(rx_missed_errors);
 597 NETSTAT_ENTRY(tx_aborted_errors);
 598 NETSTAT_ENTRY(tx_carrier_errors);
 599 NETSTAT_ENTRY(tx_fifo_errors);
 600 NETSTAT_ENTRY(tx_heartbeat_errors);
 601 NETSTAT_ENTRY(tx_window_errors);
 602 NETSTAT_ENTRY(rx_compressed);
 603 NETSTAT_ENTRY(tx_compressed);
 604 NETSTAT_ENTRY(rx_nohandler);
 605
 606 static struct attribute *netstat_attrs[] __ro_after_init = {
 607         &dev_attr_rx_packets.attr,
 608         &dev_attr_tx_packets.attr,
 609         &dev_attr_rx_bytes.attr,
 610         &dev_attr_tx_bytes.attr,
 611         &dev_attr_rx_errors.attr,
 612         &dev_attr_tx_errors.attr,
 613         &dev_attr_rx_dropped.attr,
 614         &dev_attr_tx_dropped.attr,
 615         &dev_attr_multicast.attr,
 616         &dev_attr_collisions.attr,
 617         &dev_attr_rx_length_errors.attr,
 618         &dev_attr_rx_over_errors.attr,
 619         &dev_attr_rx_crc_errors.attr,
 620         &dev_attr_rx_frame_errors.attr,
 621         &dev_attr_rx_fifo_errors.attr,
 622         &dev_attr_rx_missed_errors.attr,
 623         &dev_attr_tx_aborted_errors.attr,
 624         &dev_attr_tx_carrier_errors.attr,
 625         &dev_attr_tx_fifo_errors.attr,
 626         &dev_attr_tx_heartbeat_errors.attr,
 627         &dev_attr_tx_window_errors.attr,
 628         &dev_attr_rx_compressed.attr,
 629         &dev_attr_tx_compressed.attr,
 630         &dev_attr_rx_nohandler.attr,
 631         NULL
 632 };
 633
 634 static const struct attribute_group netstat_group = {
 635         .name  = "statistics",
 636         .attrs  = netstat_attrs,
 637 };
 638
 639 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 640 static struct attribute *wireless_attrs[] = {
 641         NULL
 642 };
 643
 644 static const struct attribute_group wireless_group = {
 645         .name = "wireless",
 646         .attrs = wireless_attrs,
 647 };
 648 #endif
 649
 650 #else /* CONFIG_SYSFS */
 651 #define net_class_groups        NULL
 652 #endif /* CONFIG_SYSFS */
 653
 654 #ifdef CONFIG_SYSFS
 655 #define to_rx_queue_attr(_attr) \
 656         container_of(_attr, struct rx_queue_attribute, attr)
 657
 658 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 659
 660 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 661                                   char *buf)
 662 {
 663         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 664         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 665
 666         if (!attribute->show)
 667                 return -EIO;
 668
 669         return attribute->show(queue, buf);
 670 }
 671
 672 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 673                                    const char *buf, size_t count)
 674 {
 675         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 676         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 677
 678         if (!attribute->store)
 679                 return -EIO;
 680
 681         return attribute->store(queue, buf, count);
 682 }
 683
 684 static const struct sysfs_ops rx_queue_sysfs_ops = {
 685         .show = rx_queue_attr_show,
 686         .store = rx_queue_attr_store,
 687 };
 688
 689 #ifdef CONFIG_RPS
 690 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
 691 {
 692         struct rps_map *map;
 693         cpumask_var_t mask;
 694         int i, len;
 695
 696         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 697                 return -ENOMEM;
 698
 699         rcu_read_lock();
 700         map = rcu_dereference(queue->rps_map);
 701         if (map)
 702                 for (i = 0; i < map->len; i++)
 703                         cpumask_set_cpu(map->cpus[i], mask);
 704
 705         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 706         rcu_read_unlock();
 707         free_cpumask_var(mask);
 708
 709         return len < PAGE_SIZE ? len : -EINVAL;
 710 }
 711
 712 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 713                              const char *buf, size_t len)
 714 {
 715         struct rps_map *old_map, *map;
 716         cpumask_var_t mask;
 717         int err, cpu, i;
 718         static DEFINE_MUTEX(rps_map_mutex);
 719
 720         if (!capable(CAP_NET_ADMIN))
 721                 return -EPERM;
 722
 723         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 724                 return -ENOMEM;
 725
 726         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 727         if (err) {
 728                 free_cpumask_var(mask);
 729                 return err;
 730         }
 731
 732         map = kzalloc(max_t(unsigned int,
 733                             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 734                       GFP_KERNEL);
 735         if (!map) {
 736                 free_cpumask_var(mask);
 737                 return -ENOMEM;
 738         }
 739
 740         i = 0;
 741         for_each_cpu_and(cpu, mask, cpu_online_mask)
 742                 map->cpus[i++] = cpu;
 743
 744         if (i) {
 745                 map->len = i;
 746         } else {
 747                 kfree(map);
 748                 map = NULL;
 749         }
 750
 751         mutex_lock(&rps_map_mutex);
 752         old_map = rcu_dereference_protected(queue->rps_map,
 753                                             mutex_is_locked(&rps_map_mutex));
 754         rcu_assign_pointer(queue->rps_map, map);
 755
 756         if (map)
 757                 static_branch_inc(&rps_needed);
 758         if (old_map)
 759                 static_branch_dec(&rps_needed);
 760
 761         mutex_unlock(&rps_map_mutex);
 762
 763         if (old_map)
 764                 kfree_rcu(old_map, rcu);
 765
 766         free_cpumask_var(mask);
 767         return len;
 768 }
 769
 770 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 771                                            char *buf)
 772 {
 773         struct rps_dev_flow_table *flow_table;
 774         unsigned long val = 0;
 775
 776         rcu_read_lock();
 777         flow_table = rcu_dereference(queue->rps_flow_table);
 778         if (flow_table)
 779                 val = (unsigned long)flow_table->mask + 1;
 780         rcu_read_unlock();
 781
 782         return sprintf(buf, "%lu\n", val);
 783 }
 784
 785 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 786 {
 787         struct rps_dev_flow_table *table = container_of(rcu,
 788             struct rps_dev_flow_table, rcu);
 789         vfree(table);
 790 }
 791
 792 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 793                                             const char *buf, size_t len)
 794 {
 795         unsigned long mask, count;
 796         struct rps_dev_flow_table *table, *old_table;
 797         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 798         int rc;
 799
 800         if (!capable(CAP_NET_ADMIN))
 801                 return -EPERM;
 802
 803         rc = kstrtoul(buf, 0, &count);
 804         if (rc < 0)
 805                 return rc;
 806
 807         if (count) {
 808                 mask = count - 1;
 809                 /* mask = roundup_pow_of_two(count) - 1;
 810                  * without overflows...
 811                  */
 812                 while ((mask | (mask >> 1)) != mask)
 813                         mask |= (mask >> 1);
 814                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 815                  * and on 32bit arches, must check
 816                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 817                  */
 818 #if BITS_PER_LONG > 32
 819                 if (mask > (unsigned long)(u32)mask)
 820                         return -EINVAL;
 821 #else
 822                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 823                                 / sizeof(struct rps_dev_flow)) {
 824                         /* Enforce a limit to prevent overflow */
 825                         return -EINVAL;
 826                 }
 827 #endif
 828                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 829                 if (!table)
 830                         return -ENOMEM;
 831
 832                 table->mask = mask;
 833                 for (count = 0; count <= mask; count++)
 834                         table->flows[count].cpu = RPS_NO_CPU;
 835         } else {
 836                 table = NULL;
 837         }
 838
 839         spin_lock(&rps_dev_flow_lock);
 840         old_table = rcu_dereference_protected(queue->rps_flow_table,
 841                                               lockdep_is_held(&rps_dev_flow_lock));
 842         rcu_assign_pointer(queue->rps_flow_table, table);
 843         spin_unlock(&rps_dev_flow_lock);
 844
 845         if (old_table)
 846                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 847
 848         return len;
 849 }
 850
 851 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
 852         = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
 853
 854 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
 855         = __ATTR(rps_flow_cnt, 0644,
 856                  show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 857 #endif /* CONFIG_RPS */
 858
 859 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
 860 #ifdef CONFIG_RPS
 861         &rps_cpus_attribute.attr,
 862         &rps_dev_flow_table_cnt_attribute.attr,
 863 #endif
 864         NULL
 865 };
 866
 867 static void rx_queue_release(struct kobject *kobj)
 868 {
 869         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 870 #ifdef CONFIG_RPS
 871         struct rps_map *map;
 872         struct rps_dev_flow_table *flow_table;
 873
 874         map = rcu_dereference_protected(queue->rps_map, 1);
 875         if (map) {
 876                 RCU_INIT_POINTER(queue->rps_map, NULL);
 877                 kfree_rcu(map, rcu);
 878         }
 879
 880         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 881         if (flow_table) {
 882                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 883                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 884         }
 885 #endif
 886
 887         memset(kobj, 0, sizeof(*kobj));
 888         dev_put(queue->dev);
 889 }
 890
 891 static const void *rx_queue_namespace(struct kobject *kobj)
 892 {
 893         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 894         struct device *dev = &queue->dev->dev;
 895         const void *ns = NULL;
 896
 897         if (dev->class && dev->class->ns_type)
 898                 ns = dev->class->namespace(dev);
 899
 900         return ns;
 901 }
 902
 903 static void rx_queue_get_ownership(struct kobject *kobj,
 904                                    kuid_t *uid, kgid_t *gid)
 905 {
 906         const struct net *net = rx_queue_namespace(kobj);
 907
 908         net_ns_get_ownership(net, uid, gid);
 909 }
 910
 911 static struct kobj_type rx_queue_ktype __ro_after_init = {
 912         .sysfs_ops = &rx_queue_sysfs_ops,
 913         .release = rx_queue_release,
 914         .default_attrs = rx_queue_default_attrs,
 915         .namespace = rx_queue_namespace,
 916         .get_ownership = rx_queue_get_ownership,
 917 };
 918
 919 static int rx_queue_add_kobject(struct net_device *dev, int index)
 920 {
 921         struct netdev_rx_queue *queue = dev->_rx + index;
 922         struct kobject *kobj = &queue->kobj;
 923         int error = 0;
 924
 925         kobj->kset = dev->queues_kset;
 926         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 927                                      "rx-%u", index);
 928         if (error)
 929                 return error;
 930
 931         dev_hold(queue->dev);
 932
 933         if (dev->sysfs_rx_queue_group) {
 934                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
 935                 if (error) {
 936                         kobject_put(kobj);
 937                         return error;
 938                 }
 939         }
 940
 941         kobject_uevent(kobj, KOBJ_ADD);
 942
 943         return error;
 944 }
 945 #endif /* CONFIG_SYSFS */
 946
 947 int
 948 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
 949 {
 950 #ifdef CONFIG_SYSFS
 951         int i;
 952         int error = 0;
 953
 954 #ifndef CONFIG_RPS
 955         if (!dev->sysfs_rx_queue_group)
 956                 return 0;
 957 #endif
 958         for (i = old_num; i < new_num; i++) {
 959                 error = rx_queue_add_kobject(dev, i);
 960                 if (error) {
 961                         new_num = old_num;
 962                         break;
 963                 }
 964         }
 965
 966         while (--i >= new_num) {
 967                 struct kobject *kobj = &dev->_rx[i].kobj;
 968
 969                 if (!refcount_read(&dev_net(dev)->count))
 970                         kobj->uevent_suppress = 1;
 971                 if (dev->sysfs_rx_queue_group)
 972                         sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
 973                 kobject_put(kobj);
 974         }
 975
 976         return error;
 977 #else
 978         return 0;
 979 #endif
 980 }
 981
 982 #ifdef CONFIG_SYSFS
 983 /*
 984  * netdev_queue sysfs structures and functions.
 985  */
 986 struct netdev_queue_attribute {
 987         struct attribute attr;
 988         ssize_t (*show)(struct netdev_queue *queue, char *buf);
 989         ssize_t (*store)(struct netdev_queue *queue,
 990                          const char *buf, size_t len);
 991 };
 992 #define to_netdev_queue_attr(_attr) \
 993         container_of(_attr, struct netdev_queue_attribute, attr)
 994
 995 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 996
 997 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 998                                       struct attribute *attr, char *buf)
 999 {
1000         const struct netdev_queue_attribute *attribute
1001                 = to_netdev_queue_attr(attr);
1002         struct netdev_queue *queue = to_netdev_queue(kobj);
1003
1004         if (!attribute->show)
1005                 return -EIO;
1006
1007         return attribute->show(queue, buf);
1008 }
1009
1010 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1011                                        struct attribute *attr,
1012                                        const char *buf, size_t count)
1013 {
1014         const struct netdev_queue_attribute *attribute
1015                 = to_netdev_queue_attr(attr);
1016         struct netdev_queue *queue = to_netdev_queue(kobj);
1017
1018         if (!attribute->store)
1019                 return -EIO;
1020
1021         return attribute->store(queue, buf, count);
1022 }
1023
1024 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1025         .show = netdev_queue_attr_show,
1026         .store = netdev_queue_attr_store,
1027 };
1028
1029 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1030 {
1031         unsigned long trans_timeout;
1032
1033         spin_lock_irq(&queue->_xmit_lock);
1034         trans_timeout = queue->trans_timeout;
1035         spin_unlock_irq(&queue->_xmit_lock);
1036
1037         return sprintf(buf, "%lu", trans_timeout);
1038 }
1039
1040 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1041 {
1042         struct net_device *dev = queue->dev;
1043         unsigned int i;
1044
1045         i = queue - dev->_tx;
1046         BUG_ON(i >= dev->num_tx_queues);
1047
1048         return i;
1049 }
1050
1051 static ssize_t traffic_class_show(struct netdev_queue *queue,
1052                                   char *buf)
1053 {
1054         struct net_device *dev = queue->dev;
1055         int index;
1056         int tc;
1057
1058         if (!netif_is_multiqueue(dev))
1059                 return -ENOENT;
1060
1061         index = get_netdev_queue_index(queue);
1062
1063         /* If queue belongs to subordinate dev use its TC mapping */
1064         dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1065
1066         tc = netdev_txq_to_tc(dev, index);
1067         if (tc < 0)
1068                 return -EINVAL;
1069
1070         /* We can report the traffic class one of two ways:
1071          * Subordinate device traffic classes are reported with the traffic
1072          * class first, and then the subordinate class so for example TC0 on
1073          * subordinate device 2 will be reported as "0-2". If the queue
1074          * belongs to the root device it will be reported with just the
1075          * traffic class, so just "0" for TC 0 for example.
1076          */
1077         return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1078                                  sprintf(buf, "%u\n", tc);
1079 }
1080
1081 #ifdef CONFIG_XPS
1082 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1083                                char *buf)
1084 {
1085         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1086 }
1087
1088 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1089                                 const char *buf, size_t len)
1090 {
1091         struct net_device *dev = queue->dev;
1092         int err, index = get_netdev_queue_index(queue);
1093         u32 rate = 0;
1094
1095         if (!capable(CAP_NET_ADMIN))
1096                 return -EPERM;
1097
1098         err = kstrtou32(buf, 10, &rate);
1099         if (err < 0)
1100                 return err;
1101
1102         if (!rtnl_trylock())
1103                 return restart_syscall();
1104
1105         err = -EOPNOTSUPP;
1106         if (dev->netdev_ops->ndo_set_tx_maxrate)
1107                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1108
1109         rtnl_unlock();
1110         if (!err) {
1111                 queue->tx_maxrate = rate;
1112                 return len;
1113         }
1114         return err;
1115 }
1116
1117 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1118         = __ATTR_RW(tx_maxrate);
1119 #endif
1120
1121 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1122         = __ATTR_RO(tx_timeout);
1123
1124 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1125         = __ATTR_RO(traffic_class);
1126
1127 #ifdef CONFIG_BQL
1128 /*
1129  * Byte queue limits sysfs structures and functions.
1130  */
1131 static ssize_t bql_show(char *buf, unsigned int value)
1132 {
1133         return sprintf(buf, "%u\n", value);
1134 }
1135
1136 static ssize_t bql_set(const char *buf, const size_t count,
1137                        unsigned int *pvalue)
1138 {
1139         unsigned int value;
1140         int err;
1141
1142         if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1143                 value = DQL_MAX_LIMIT;
1144         } else {
1145                 err = kstrtouint(buf, 10, &value);
1146                 if (err < 0)
1147                         return err;
1148                 if (value > DQL_MAX_LIMIT)
1149                         return -EINVAL;
1150         }
1151
1152         *pvalue = value;
1153
1154         return count;
1155 }
1156
1157 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1158                                   char *buf)
1159 {
1160         struct dql *dql = &queue->dql;
1161
1162         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1163 }
1164
1165 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1166                                  const char *buf, size_t len)
1167 {
1168         struct dql *dql = &queue->dql;
1169         unsigned int value;
1170         int err;
1171
1172         err = kstrtouint(buf, 10, &value);
1173         if (err < 0)
1174                 return err;
1175
1176         dql->slack_hold_time = msecs_to_jiffies(value);
1177
1178         return len;
1179 }
1180
1181 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1182         = __ATTR(hold_time, 0644,
1183                  bql_show_hold_time, bql_set_hold_time);
1184
1185 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1186                                  char *buf)
1187 {
1188         struct dql *dql = &queue->dql;
1189
1190         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1191 }
1192
1193 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1194         __ATTR(inflight, 0444, bql_show_inflight, NULL);
1195
1196 #define BQL_ATTR(NAME, FIELD)                                           \
1197 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1198                                  char *buf)                             \
1199 {                                                                       \
1200         return bql_show(buf, queue->dql.FIELD);                         \
1201 }                                                                       \
1202                                                                         \
1203 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1204                                 const char *buf, size_t len)            \
1205 {                                                                       \
1206         return bql_set(buf, len, &queue->dql.FIELD);                    \
1207 }                                                                       \
1208                                                                         \
1209 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1210         = __ATTR(NAME, 0644,                            \
1211                  bql_show_ ## NAME, bql_set_ ## NAME)
1212
1213 BQL_ATTR(limit, limit);
1214 BQL_ATTR(limit_max, max_limit);
1215 BQL_ATTR(limit_min, min_limit);
1216
1217 static struct attribute *dql_attrs[] __ro_after_init = {
1218         &bql_limit_attribute.attr,
1219         &bql_limit_max_attribute.attr,
1220         &bql_limit_min_attribute.attr,
1221         &bql_hold_time_attribute.attr,
1222         &bql_inflight_attribute.attr,
1223         NULL
1224 };
1225
1226 static const struct attribute_group dql_group = {
1227         .name  = "byte_queue_limits",
1228         .attrs  = dql_attrs,
1229 };
1230 #endif /* CONFIG_BQL */
1231
1232 #ifdef CONFIG_XPS
1233 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1234                              char *buf)
1235 {
1236         struct net_device *dev = queue->dev;
1237         int cpu, len, num_tc = 1, tc = 0;
1238         struct xps_dev_maps *dev_maps;
1239         cpumask_var_t mask;
1240         unsigned long index;
1241
1242         if (!netif_is_multiqueue(dev))
1243                 return -ENOENT;
1244
1245         index = get_netdev_queue_index(queue);
1246
1247         if (dev->num_tc) {
1248                 /* Do not allow XPS on subordinate device directly */
1249                 num_tc = dev->num_tc;
1250                 if (num_tc < 0)
1251                         return -EINVAL;
1252
1253                 /* If queue belongs to subordinate dev use its map */
1254                 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1255
1256                 tc = netdev_txq_to_tc(dev, index);
1257                 if (tc < 0)
1258                         return -EINVAL;
1259         }
1260
1261         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1262                 return -ENOMEM;
1263
1264         rcu_read_lock();
1265         dev_maps = rcu_dereference(dev->xps_cpus_map);
1266         if (dev_maps) {
1267                 for_each_possible_cpu(cpu) {
1268                         int i, tci = cpu * num_tc + tc;
1269                         struct xps_map *map;
1270
1271                         map = rcu_dereference(dev_maps->attr_map[tci]);
1272                         if (!map)
1273                                 continue;
1274
1275                         for (i = map->len; i--;) {
1276                                 if (map->queues[i] == index) {
1277                                         cpumask_set_cpu(cpu, mask);
1278                                         break;
1279                                 }
1280                         }
1281                 }
1282         }
1283         rcu_read_unlock();
1284
1285         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1286         free_cpumask_var(mask);
1287         return len < PAGE_SIZE ? len : -EINVAL;
1288 }
1289
1290 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1291                               const char *buf, size_t len)
1292 {
1293         struct net_device *dev = queue->dev;
1294         unsigned long index;
1295         cpumask_var_t mask;
1296         int err;
1297
1298         if (!netif_is_multiqueue(dev))
1299                 return -ENOENT;
1300
1301         if (!capable(CAP_NET_ADMIN))
1302                 return -EPERM;
1303
1304         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1305                 return -ENOMEM;
1306
1307         index = get_netdev_queue_index(queue);
1308
1309         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1310         if (err) {
1311                 free_cpumask_var(mask);
1312                 return err;
1313         }
1314
1315         err = netif_set_xps_queue(dev, mask, index);
1316
1317         free_cpumask_var(mask);
1318
1319         return err ? : len;
1320 }
1321
1322 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1323         = __ATTR_RW(xps_cpus);
1324
1325 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1326 {
1327         struct net_device *dev = queue->dev;
1328         struct xps_dev_maps *dev_maps;
1329         unsigned long *mask, index;
1330         int j, len, num_tc = 1, tc = 0;
1331
1332         index = get_netdev_queue_index(queue);
1333
1334         if (dev->num_tc) {
1335                 num_tc = dev->num_tc;
1336                 tc = netdev_txq_to_tc(dev, index);
1337                 if (tc < 0)
1338                         return -EINVAL;
1339         }
1340         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1341         if (!mask)
1342                 return -ENOMEM;
1343
1344         rcu_read_lock();
1345         dev_maps = rcu_dereference(dev->xps_rxqs_map);
1346         if (!dev_maps)
1347                 goto out_no_maps;
1348
1349         for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1350              j < dev->num_rx_queues;) {
1351                 int i, tci = j * num_tc + tc;
1352                 struct xps_map *map;
1353
1354                 map = rcu_dereference(dev_maps->attr_map[tci]);
1355                 if (!map)
1356                         continue;
1357
1358                 for (i = map->len; i--;) {
1359                         if (map->queues[i] == index) {
1360                                 set_bit(j, mask);
1361                                 break;
1362                         }
1363                 }
1364         }
1365 out_no_maps:
1366         rcu_read_unlock();
1367
1368         len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1369         bitmap_free(mask);
1370
1371         return len < PAGE_SIZE ? len : -EINVAL;
1372 }
1373
1374 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1375                               size_t len)
1376 {
1377         struct net_device *dev = queue->dev;
1378         struct net *net = dev_net(dev);
1379         unsigned long *mask, index;
1380         int err;
1381
1382         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1383                 return -EPERM;
1384
1385         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1386         if (!mask)
1387                 return -ENOMEM;
1388
1389         index = get_netdev_queue_index(queue);
1390
1391         err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1392         if (err) {
1393                 bitmap_free(mask);
1394                 return err;
1395         }
1396
1397         cpus_read_lock();
1398         err = __netif_set_xps_queue(dev, mask, index, true);
1399         cpus_read_unlock();
1400
1401         bitmap_free(mask);
1402         return err ? : len;
1403 }
1404
1405 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1406         = __ATTR_RW(xps_rxqs);
1407 #endif /* CONFIG_XPS */
1408
1409 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1410         &queue_trans_timeout.attr,
1411         &queue_traffic_class.attr,
1412 #ifdef CONFIG_XPS
1413         &xps_cpus_attribute.attr,
1414         &xps_rxqs_attribute.attr,
1415         &queue_tx_maxrate.attr,
1416 #endif
1417         NULL
1418 };
1419
1420 static void netdev_queue_release(struct kobject *kobj)
1421 {
1422         struct netdev_queue *queue = to_netdev_queue(kobj);
1423
1424         memset(kobj, 0, sizeof(*kobj));
1425         dev_put(queue->dev);
1426 }
1427
1428 static const void *netdev_queue_namespace(struct kobject *kobj)
1429 {
1430         struct netdev_queue *queue = to_netdev_queue(kobj);
1431         struct device *dev = &queue->dev->dev;
1432         const void *ns = NULL;
1433
1434         if (dev->class && dev->class->ns_type)
1435                 ns = dev->class->namespace(dev);
1436
1437         return ns;
1438 }
1439
1440 static void netdev_queue_get_ownership(struct kobject *kobj,
1441                                        kuid_t *uid, kgid_t *gid)
1442 {
1443         const struct net *net = netdev_queue_namespace(kobj);
1444
1445         net_ns_get_ownership(net, uid, gid);
1446 }
1447
1448 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1449         .sysfs_ops = &netdev_queue_sysfs_ops,
1450         .release = netdev_queue_release,
1451         .default_attrs = netdev_queue_default_attrs,
1452         .namespace = netdev_queue_namespace,
1453         .get_ownership = netdev_queue_get_ownership,
1454 };
1455
1456 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1457 {
1458         struct netdev_queue *queue = dev->_tx + index;
1459         struct kobject *kobj = &queue->kobj;
1460         int error = 0;
1461
1462         kobj->kset = dev->queues_kset;
1463         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1464                                      "tx-%u", index);
1465         if (error)
1466                 return error;
1467
1468         dev_hold(queue->dev);
1469
1470 #ifdef CONFIG_BQL
1471         error = sysfs_create_group(kobj, &dql_group);
1472         if (error) {
1473                 kobject_put(kobj);
1474                 return error;
1475         }
1476 #endif
1477
1478         kobject_uevent(kobj, KOBJ_ADD);
1479
1480         return 0;
1481 }
1482 #endif /* CONFIG_SYSFS */
1483
1484 int
1485 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1486 {
1487 #ifdef CONFIG_SYSFS
1488         int i;
1489         int error = 0;
1490
1491         for (i = old_num; i < new_num; i++) {
1492                 error = netdev_queue_add_kobject(dev, i);
1493                 if (error) {
1494                         new_num = old_num;
1495                         break;
1496                 }
1497         }
1498
1499         while (--i >= new_num) {
1500                 struct netdev_queue *queue = dev->_tx + i;
1501
1502                 if (!refcount_read(&dev_net(dev)->count))
1503                         queue->kobj.uevent_suppress = 1;
1504 #ifdef CONFIG_BQL
1505                 sysfs_remove_group(&queue->kobj, &dql_group);
1506 #endif
1507                 kobject_put(&queue->kobj);
1508         }
1509
1510         return error;
1511 #else
1512         return 0;
1513 #endif /* CONFIG_SYSFS */
1514 }
1515
1516 static int register_queue_kobjects(struct net_device *dev)
1517 {
1518         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1519
1520 #ifdef CONFIG_SYSFS
1521         dev->queues_kset = kset_create_and_add("queues",
1522                                                NULL, &dev->dev.kobj);
1523         if (!dev->queues_kset)
1524                 return -ENOMEM;
1525         real_rx = dev->real_num_rx_queues;
1526 #endif
1527         real_tx = dev->real_num_tx_queues;
1528
1529         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1530         if (error)
1531                 goto error;
1532         rxq = real_rx;
1533
1534         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1535         if (error)
1536                 goto error;
1537         txq = real_tx;
1538
1539         return 0;
1540
1541 error:
1542         netdev_queue_update_kobjects(dev, txq, 0);
1543         net_rx_queue_update_kobjects(dev, rxq, 0);
1544 #ifdef CONFIG_SYSFS
1545         kset_unregister(dev->queues_kset);
1546 #endif
1547         return error;
1548 }
1549
1550 static void remove_queue_kobjects(struct net_device *dev)
1551 {
1552         int real_rx = 0, real_tx = 0;
1553
1554 #ifdef CONFIG_SYSFS
1555         real_rx = dev->real_num_rx_queues;
1556 #endif
1557         real_tx = dev->real_num_tx_queues;
1558
1559         net_rx_queue_update_kobjects(dev, real_rx, 0);
1560         netdev_queue_update_kobjects(dev, real_tx, 0);
1561 #ifdef CONFIG_SYSFS
1562         kset_unregister(dev->queues_kset);
1563 #endif
1564 }
1565
1566 static bool net_current_may_mount(void)
1567 {
1568         struct net *net = current->nsproxy->net_ns;
1569
1570         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1571 }
1572
1573 static void *net_grab_current_ns(void)
1574 {
1575         struct net *ns = current->nsproxy->net_ns;
1576 #ifdef CONFIG_NET_NS
1577         if (ns)
1578                 refcount_inc(&ns->passive);
1579 #endif
1580         return ns;
1581 }
1582
1583 static const void *net_initial_ns(void)
1584 {
1585         return &init_net;
1586 }
1587
1588 static const void *net_netlink_ns(struct sock *sk)
1589 {
1590         return sock_net(sk);
1591 }
1592
1593 const struct kobj_ns_type_operations net_ns_type_operations = {
1594         .type = KOBJ_NS_TYPE_NET,
1595         .current_may_mount = net_current_may_mount,
1596         .grab_current_ns = net_grab_current_ns,
1597         .netlink_ns = net_netlink_ns,
1598         .initial_ns = net_initial_ns,
1599         .drop_ns = net_drop_ns,
1600 };
1601 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1602
1603 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1604 {
1605         struct net_device *dev = to_net_dev(d);
1606         int retval;
1607
1608         /* pass interface to uevent. */
1609         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1610         if (retval)
1611                 goto exit;
1612
1613         /* pass ifindex to uevent.
1614          * ifindex is useful as it won't change (interface name may change)
1615          * and is what RtNetlink uses natively.
1616          */
1617         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1618
1619 exit:
1620         return retval;
1621 }
1622
1623 /*
1624  *      netdev_release -- destroy and free a dead device.
1625  *      Called when last reference to device kobject is gone.
1626  */
1627 static void netdev_release(struct device *d)
1628 {
1629         struct net_device *dev = to_net_dev(d);
1630
1631         BUG_ON(dev->reg_state != NETREG_RELEASED);
1632
1633         /* no need to wait for rcu grace period:
1634          * device is dead and about to be freed.
1635          */
1636         kfree(rcu_access_pointer(dev->ifalias));
1637         netdev_freemem(dev);
1638 }
1639
1640 static const void *net_namespace(struct device *d)
1641 {
1642         struct net_device *dev = to_net_dev(d);
1643
1644         return dev_net(dev);
1645 }
1646
1647 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1648 {
1649         struct net_device *dev = to_net_dev(d);
1650         const struct net *net = dev_net(dev);
1651
1652         net_ns_get_ownership(net, uid, gid);
1653 }
1654
1655 static struct class net_class __ro_after_init = {
1656         .name = "net",
1657         .dev_release = netdev_release,
1658         .dev_groups = net_class_groups,
1659         .dev_uevent = netdev_uevent,
1660         .ns_type = &net_ns_type_operations,
1661         .namespace = net_namespace,
1662         .get_ownership = net_get_ownership,
1663 };
1664
1665 #ifdef CONFIG_OF_NET
1666 static int of_dev_node_match(struct device *dev, const void *data)
1667 {
1668         int ret = 0;
1669
1670         if (dev->parent)
1671                 ret = dev->parent->of_node == data;
1672
1673         return ret == 0 ? dev->of_node == data : ret;
1674 }
1675
1676 /*
1677  * of_find_net_device_by_node - lookup the net device for the device node
1678  * @np: OF device node
1679  *
1680  * Looks up the net_device structure corresponding with the device node.
1681  * If successful, returns a pointer to the net_device with the embedded
1682  * struct device refcount incremented by one, or NULL on failure. The
1683  * refcount must be dropped when done with the net_device.
1684  */
1685 struct net_device *of_find_net_device_by_node(struct device_node *np)
1686 {
1687         struct device *dev;
1688
1689         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1690         if (!dev)
1691                 return NULL;
1692
1693         return to_net_dev(dev);
1694 }
1695 EXPORT_SYMBOL(of_find_net_device_by_node);
1696 #endif
1697
1698 /* Delete sysfs entries but hold kobject reference until after all
1699  * netdev references are gone.
1700  */
1701 void netdev_unregister_kobject(struct net_device *ndev)
1702 {
1703         struct device *dev = &ndev->dev;
1704
1705         if (!refcount_read(&dev_net(ndev)->count))
1706                 dev_set_uevent_suppress(dev, 1);
1707
1708         kobject_get(&dev->kobj);
1709
1710         remove_queue_kobjects(ndev);
1711
1712         pm_runtime_set_memalloc_noio(dev, false);
1713
1714         device_del(dev);
1715 }
1716
1717 /* Create sysfs entries for network device. */
1718 int netdev_register_kobject(struct net_device *ndev)
1719 {
1720         struct device *dev = &ndev->dev;
1721         const struct attribute_group **groups = ndev->sysfs_groups;
1722         int error = 0;
1723
1724         device_initialize(dev);
1725         dev->class = &net_class;
1726         dev->platform_data = ndev;
1727         dev->groups = groups;
1728
1729         dev_set_name(dev, "%s", ndev->name);
1730
1731 #ifdef CONFIG_SYSFS
1732         /* Allow for a device specific group */
1733         if (*groups)
1734                 groups++;
1735
1736         *groups++ = &netstat_group;
1737
1738 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1739         if (ndev->ieee80211_ptr)
1740                 *groups++ = &wireless_group;
1741 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1742         else if (ndev->wireless_handlers)
1743                 *groups++ = &wireless_group;
1744 #endif
1745 #endif
1746 #endif /* CONFIG_SYSFS */
1747
1748         error = device_add(dev);
1749         if (error)
1750                 goto error_put_device;
1751
1752         error = register_queue_kobjects(ndev);
1753         if (error)
1754                 goto error_device_del;
1755
1756         pm_runtime_set_memalloc_noio(dev, true);
1757
1758         return 0;
1759
1760 error_device_del:
1761         device_del(dev);
1762 error_put_device:
1763         put_device(dev);
1764         return error;
1765 }
1766
1767 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1768                                 const void *ns)
1769 {
1770         return class_create_file_ns(&net_class, class_attr, ns);
1771 }
1772 EXPORT_SYMBOL(netdev_class_create_file_ns);
1773
1774 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1775                                  const void *ns)
1776 {
1777         class_remove_file_ns(&net_class, class_attr, ns);
1778 }
1779 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1780
1781 int __init netdev_kobject_init(void)
1782 {
1783         kobj_ns_type_register(&net_ns_type_operations);
1784         return class_register(&net_class);
1785 }