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 ATTRIBUTE_GROUPS(rx_queue_default);
 867
 868 static void rx_queue_release(struct kobject *kobj)
 869 {
 870         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 871 #ifdef CONFIG_RPS
 872         struct rps_map *map;
 873         struct rps_dev_flow_table *flow_table;
 874
 875         map = rcu_dereference_protected(queue->rps_map, 1);
 876         if (map) {
 877                 RCU_INIT_POINTER(queue->rps_map, NULL);
 878                 kfree_rcu(map, rcu);
 879         }
 880
 881         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 882         if (flow_table) {
 883                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 884                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 885         }
 886 #endif
 887
 888         memset(kobj, 0, sizeof(*kobj));
 889         dev_put(queue->dev);
 890 }
 891
 892 static const void *rx_queue_namespace(struct kobject *kobj)
 893 {
 894         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 895         struct device *dev = &queue->dev->dev;
 896         const void *ns = NULL;
 897
 898         if (dev->class && dev->class->ns_type)
 899                 ns = dev->class->namespace(dev);
 900
 901         return ns;
 902 }
 903
 904 static void rx_queue_get_ownership(struct kobject *kobj,
 905                                    kuid_t *uid, kgid_t *gid)
 906 {
 907         const struct net *net = rx_queue_namespace(kobj);
 908
 909         net_ns_get_ownership(net, uid, gid);
 910 }
 911
 912 static struct kobj_type rx_queue_ktype __ro_after_init = {
 913         .sysfs_ops = &rx_queue_sysfs_ops,
 914         .release = rx_queue_release,
 915         .default_groups = rx_queue_default_groups,
 916         .namespace = rx_queue_namespace,
 917         .get_ownership = rx_queue_get_ownership,
 918 };
 919
 920 static int rx_queue_add_kobject(struct net_device *dev, int index)
 921 {
 922         struct netdev_rx_queue *queue = dev->_rx + index;
 923         struct kobject *kobj = &queue->kobj;
 924         int error = 0;
 925
 926         kobj->kset = dev->queues_kset;
 927         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 928                                      "rx-%u", index);
 929         if (error)
 930                 return error;
 931
 932         dev_hold(queue->dev);
 933
 934         if (dev->sysfs_rx_queue_group) {
 935                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
 936                 if (error) {
 937                         kobject_put(kobj);
 938                         return error;
 939                 }
 940         }
 941
 942         kobject_uevent(kobj, KOBJ_ADD);
 943
 944         return error;
 945 }
 946 #endif /* CONFIG_SYSFS */
 947
 948 int
 949 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
 950 {
 951 #ifdef CONFIG_SYSFS
 952         int i;
 953         int error = 0;
 954
 955 #ifndef CONFIG_RPS
 956         if (!dev->sysfs_rx_queue_group)
 957                 return 0;
 958 #endif
 959         for (i = old_num; i < new_num; i++) {
 960                 error = rx_queue_add_kobject(dev, i);
 961                 if (error) {
 962                         new_num = old_num;
 963                         break;
 964                 }
 965         }
 966
 967         while (--i >= new_num) {
 968                 struct kobject *kobj = &dev->_rx[i].kobj;
 969
 970                 if (!refcount_read(&dev_net(dev)->count))
 971                         kobj->uevent_suppress = 1;
 972                 if (dev->sysfs_rx_queue_group)
 973                         sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
 974                 kobject_put(kobj);
 975         }
 976
 977         return error;
 978 #else
 979         return 0;
 980 #endif
 981 }
 982
 983 #ifdef CONFIG_SYSFS
 984 /*
 985  * netdev_queue sysfs structures and functions.
 986  */
 987 struct netdev_queue_attribute {
 988         struct attribute attr;
 989         ssize_t (*show)(struct netdev_queue *queue, char *buf);
 990         ssize_t (*store)(struct netdev_queue *queue,
 991                          const char *buf, size_t len);
 992 };
 993 #define to_netdev_queue_attr(_attr) \
 994         container_of(_attr, struct netdev_queue_attribute, attr)
 995
 996 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 997
 998 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 999                                       struct attribute *attr, char *buf)
1000 {
1001         const struct netdev_queue_attribute *attribute
1002                 = to_netdev_queue_attr(attr);
1003         struct netdev_queue *queue = to_netdev_queue(kobj);
1004
1005         if (!attribute->show)
1006                 return -EIO;
1007
1008         return attribute->show(queue, buf);
1009 }
1010
1011 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1012                                        struct attribute *attr,
1013                                        const char *buf, size_t count)
1014 {
1015         const struct netdev_queue_attribute *attribute
1016                 = to_netdev_queue_attr(attr);
1017         struct netdev_queue *queue = to_netdev_queue(kobj);
1018
1019         if (!attribute->store)
1020                 return -EIO;
1021
1022         return attribute->store(queue, buf, count);
1023 }
1024
1025 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1026         .show = netdev_queue_attr_show,
1027         .store = netdev_queue_attr_store,
1028 };
1029
1030 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1031 {
1032         unsigned long trans_timeout;
1033
1034         spin_lock_irq(&queue->_xmit_lock);
1035         trans_timeout = queue->trans_timeout;
1036         spin_unlock_irq(&queue->_xmit_lock);
1037
1038         return sprintf(buf, "%lu", trans_timeout);
1039 }
1040
1041 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1042 {
1043         struct net_device *dev = queue->dev;
1044         unsigned int i;
1045
1046         i = queue - dev->_tx;
1047         BUG_ON(i >= dev->num_tx_queues);
1048
1049         return i;
1050 }
1051
1052 static ssize_t traffic_class_show(struct netdev_queue *queue,
1053                                   char *buf)
1054 {
1055         struct net_device *dev = queue->dev;
1056         int index;
1057         int tc;
1058
1059         if (!netif_is_multiqueue(dev))
1060                 return -ENOENT;
1061
1062         index = get_netdev_queue_index(queue);
1063
1064         /* If queue belongs to subordinate dev use its TC mapping */
1065         dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1066
1067         tc = netdev_txq_to_tc(dev, index);
1068         if (tc < 0)
1069                 return -EINVAL;
1070
1071         /* We can report the traffic class one of two ways:
1072          * Subordinate device traffic classes are reported with the traffic
1073          * class first, and then the subordinate class so for example TC0 on
1074          * subordinate device 2 will be reported as "0-2". If the queue
1075          * belongs to the root device it will be reported with just the
1076          * traffic class, so just "0" for TC 0 for example.
1077          */
1078         return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1079                                  sprintf(buf, "%u\n", tc);
1080 }
1081
1082 #ifdef CONFIG_XPS
1083 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1084                                char *buf)
1085 {
1086         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1087 }
1088
1089 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1090                                 const char *buf, size_t len)
1091 {
1092         struct net_device *dev = queue->dev;
1093         int err, index = get_netdev_queue_index(queue);
1094         u32 rate = 0;
1095
1096         if (!capable(CAP_NET_ADMIN))
1097                 return -EPERM;
1098
1099         err = kstrtou32(buf, 10, &rate);
1100         if (err < 0)
1101                 return err;
1102
1103         if (!rtnl_trylock())
1104                 return restart_syscall();
1105
1106         err = -EOPNOTSUPP;
1107         if (dev->netdev_ops->ndo_set_tx_maxrate)
1108                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1109
1110         rtnl_unlock();
1111         if (!err) {
1112                 queue->tx_maxrate = rate;
1113                 return len;
1114         }
1115         return err;
1116 }
1117
1118 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1119         = __ATTR_RW(tx_maxrate);
1120 #endif
1121
1122 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1123         = __ATTR_RO(tx_timeout);
1124
1125 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1126         = __ATTR_RO(traffic_class);
1127
1128 #ifdef CONFIG_BQL
1129 /*
1130  * Byte queue limits sysfs structures and functions.
1131  */
1132 static ssize_t bql_show(char *buf, unsigned int value)
1133 {
1134         return sprintf(buf, "%u\n", value);
1135 }
1136
1137 static ssize_t bql_set(const char *buf, const size_t count,
1138                        unsigned int *pvalue)
1139 {
1140         unsigned int value;
1141         int err;
1142
1143         if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1144                 value = DQL_MAX_LIMIT;
1145         } else {
1146                 err = kstrtouint(buf, 10, &value);
1147                 if (err < 0)
1148                         return err;
1149                 if (value > DQL_MAX_LIMIT)
1150                         return -EINVAL;
1151         }
1152
1153         *pvalue = value;
1154
1155         return count;
1156 }
1157
1158 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1159                                   char *buf)
1160 {
1161         struct dql *dql = &queue->dql;
1162
1163         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1164 }
1165
1166 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1167                                  const char *buf, size_t len)
1168 {
1169         struct dql *dql = &queue->dql;
1170         unsigned int value;
1171         int err;
1172
1173         err = kstrtouint(buf, 10, &value);
1174         if (err < 0)
1175                 return err;
1176
1177         dql->slack_hold_time = msecs_to_jiffies(value);
1178
1179         return len;
1180 }
1181
1182 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1183         = __ATTR(hold_time, 0644,
1184                  bql_show_hold_time, bql_set_hold_time);
1185
1186 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1187                                  char *buf)
1188 {
1189         struct dql *dql = &queue->dql;
1190
1191         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1192 }
1193
1194 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1195         __ATTR(inflight, 0444, bql_show_inflight, NULL);
1196
1197 #define BQL_ATTR(NAME, FIELD)                                           \
1198 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1199                                  char *buf)                             \
1200 {                                                                       \
1201         return bql_show(buf, queue->dql.FIELD);                         \
1202 }                                                                       \
1203                                                                         \
1204 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1205                                 const char *buf, size_t len)            \
1206 {                                                                       \
1207         return bql_set(buf, len, &queue->dql.FIELD);                    \
1208 }                                                                       \
1209                                                                         \
1210 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1211         = __ATTR(NAME, 0644,                            \
1212                  bql_show_ ## NAME, bql_set_ ## NAME)
1213
1214 BQL_ATTR(limit, limit);
1215 BQL_ATTR(limit_max, max_limit);
1216 BQL_ATTR(limit_min, min_limit);
1217
1218 static struct attribute *dql_attrs[] __ro_after_init = {
1219         &bql_limit_attribute.attr,
1220         &bql_limit_max_attribute.attr,
1221         &bql_limit_min_attribute.attr,
1222         &bql_hold_time_attribute.attr,
1223         &bql_inflight_attribute.attr,
1224         NULL
1225 };
1226
1227 static const struct attribute_group dql_group = {
1228         .name  = "byte_queue_limits",
1229         .attrs  = dql_attrs,
1230 };
1231 #endif /* CONFIG_BQL */
1232
1233 #ifdef CONFIG_XPS
1234 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1235                              char *buf)
1236 {
1237         struct net_device *dev = queue->dev;
1238         int cpu, len, num_tc = 1, tc = 0;
1239         struct xps_dev_maps *dev_maps;
1240         cpumask_var_t mask;
1241         unsigned long index;
1242
1243         if (!netif_is_multiqueue(dev))
1244                 return -ENOENT;
1245
1246         index = get_netdev_queue_index(queue);
1247
1248         if (dev->num_tc) {
1249                 /* Do not allow XPS on subordinate device directly */
1250                 num_tc = dev->num_tc;
1251                 if (num_tc < 0)
1252                         return -EINVAL;
1253
1254                 /* If queue belongs to subordinate dev use its map */
1255                 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1256
1257                 tc = netdev_txq_to_tc(dev, index);
1258                 if (tc < 0)
1259                         return -EINVAL;
1260         }
1261
1262         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1263                 return -ENOMEM;
1264
1265         rcu_read_lock();
1266         dev_maps = rcu_dereference(dev->xps_cpus_map);
1267         if (dev_maps) {
1268                 for_each_possible_cpu(cpu) {
1269                         int i, tci = cpu * num_tc + tc;
1270                         struct xps_map *map;
1271
1272                         map = rcu_dereference(dev_maps->attr_map[tci]);
1273                         if (!map)
1274                                 continue;
1275
1276                         for (i = map->len; i--;) {
1277                                 if (map->queues[i] == index) {
1278                                         cpumask_set_cpu(cpu, mask);
1279                                         break;
1280                                 }
1281                         }
1282                 }
1283         }
1284         rcu_read_unlock();
1285
1286         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1287         free_cpumask_var(mask);
1288         return len < PAGE_SIZE ? len : -EINVAL;
1289 }
1290
1291 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1292                               const char *buf, size_t len)
1293 {
1294         struct net_device *dev = queue->dev;
1295         unsigned long index;
1296         cpumask_var_t mask;
1297         int err;
1298
1299         if (!netif_is_multiqueue(dev))
1300                 return -ENOENT;
1301
1302         if (!capable(CAP_NET_ADMIN))
1303                 return -EPERM;
1304
1305         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1306                 return -ENOMEM;
1307
1308         index = get_netdev_queue_index(queue);
1309
1310         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1311         if (err) {
1312                 free_cpumask_var(mask);
1313                 return err;
1314         }
1315
1316         err = netif_set_xps_queue(dev, mask, index);
1317
1318         free_cpumask_var(mask);
1319
1320         return err ? : len;
1321 }
1322
1323 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1324         = __ATTR_RW(xps_cpus);
1325
1326 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1327 {
1328         struct net_device *dev = queue->dev;
1329         struct xps_dev_maps *dev_maps;
1330         unsigned long *mask, index;
1331         int j, len, num_tc = 1, tc = 0;
1332
1333         index = get_netdev_queue_index(queue);
1334
1335         if (dev->num_tc) {
1336                 num_tc = dev->num_tc;
1337                 tc = netdev_txq_to_tc(dev, index);
1338                 if (tc < 0)
1339                         return -EINVAL;
1340         }
1341         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1342         if (!mask)
1343                 return -ENOMEM;
1344
1345         rcu_read_lock();
1346         dev_maps = rcu_dereference(dev->xps_rxqs_map);
1347         if (!dev_maps)
1348                 goto out_no_maps;
1349
1350         for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1351              j < dev->num_rx_queues;) {
1352                 int i, tci = j * num_tc + tc;
1353                 struct xps_map *map;
1354
1355                 map = rcu_dereference(dev_maps->attr_map[tci]);
1356                 if (!map)
1357                         continue;
1358
1359                 for (i = map->len; i--;) {
1360                         if (map->queues[i] == index) {
1361                                 set_bit(j, mask);
1362                                 break;
1363                         }
1364                 }
1365         }
1366 out_no_maps:
1367         rcu_read_unlock();
1368
1369         len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1370         bitmap_free(mask);
1371
1372         return len < PAGE_SIZE ? len : -EINVAL;
1373 }
1374
1375 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1376                               size_t len)
1377 {
1378         struct net_device *dev = queue->dev;
1379         struct net *net = dev_net(dev);
1380         unsigned long *mask, index;
1381         int err;
1382
1383         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1384                 return -EPERM;
1385
1386         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1387         if (!mask)
1388                 return -ENOMEM;
1389
1390         index = get_netdev_queue_index(queue);
1391
1392         err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1393         if (err) {
1394                 bitmap_free(mask);
1395                 return err;
1396         }
1397
1398         cpus_read_lock();
1399         err = __netif_set_xps_queue(dev, mask, index, true);
1400         cpus_read_unlock();
1401
1402         bitmap_free(mask);
1403         return err ? : len;
1404 }
1405
1406 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1407         = __ATTR_RW(xps_rxqs);
1408 #endif /* CONFIG_XPS */
1409
1410 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1411         &queue_trans_timeout.attr,
1412         &queue_traffic_class.attr,
1413 #ifdef CONFIG_XPS
1414         &xps_cpus_attribute.attr,
1415         &xps_rxqs_attribute.attr,
1416         &queue_tx_maxrate.attr,
1417 #endif
1418         NULL
1419 };
1420 ATTRIBUTE_GROUPS(netdev_queue_default);
1421
1422 static void netdev_queue_release(struct kobject *kobj)
1423 {
1424         struct netdev_queue *queue = to_netdev_queue(kobj);
1425
1426         memset(kobj, 0, sizeof(*kobj));
1427         dev_put(queue->dev);
1428 }
1429
1430 static const void *netdev_queue_namespace(struct kobject *kobj)
1431 {
1432         struct netdev_queue *queue = to_netdev_queue(kobj);
1433         struct device *dev = &queue->dev->dev;
1434         const void *ns = NULL;
1435
1436         if (dev->class && dev->class->ns_type)
1437                 ns = dev->class->namespace(dev);
1438
1439         return ns;
1440 }
1441
1442 static void netdev_queue_get_ownership(struct kobject *kobj,
1443                                        kuid_t *uid, kgid_t *gid)
1444 {
1445         const struct net *net = netdev_queue_namespace(kobj);
1446
1447         net_ns_get_ownership(net, uid, gid);
1448 }
1449
1450 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1451         .sysfs_ops = &netdev_queue_sysfs_ops,
1452         .release = netdev_queue_release,
1453         .default_groups = netdev_queue_default_groups,
1454         .namespace = netdev_queue_namespace,
1455         .get_ownership = netdev_queue_get_ownership,
1456 };
1457
1458 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1459 {
1460         struct netdev_queue *queue = dev->_tx + index;
1461         struct kobject *kobj = &queue->kobj;
1462         int error = 0;
1463
1464         kobj->kset = dev->queues_kset;
1465         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1466                                      "tx-%u", index);
1467         if (error)
1468                 return error;
1469
1470         dev_hold(queue->dev);
1471
1472 #ifdef CONFIG_BQL
1473         error = sysfs_create_group(kobj, &dql_group);
1474         if (error) {
1475                 kobject_put(kobj);
1476                 return error;
1477         }
1478 #endif
1479
1480         kobject_uevent(kobj, KOBJ_ADD);
1481
1482         return 0;
1483 }
1484 #endif /* CONFIG_SYSFS */
1485
1486 int
1487 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1488 {
1489 #ifdef CONFIG_SYSFS
1490         int i;
1491         int error = 0;
1492
1493         for (i = old_num; i < new_num; i++) {
1494                 error = netdev_queue_add_kobject(dev, i);
1495                 if (error) {
1496                         new_num = old_num;
1497                         break;
1498                 }
1499         }
1500
1501         while (--i >= new_num) {
1502                 struct netdev_queue *queue = dev->_tx + i;
1503
1504                 if (!refcount_read(&dev_net(dev)->count))
1505                         queue->kobj.uevent_suppress = 1;
1506 #ifdef CONFIG_BQL
1507                 sysfs_remove_group(&queue->kobj, &dql_group);
1508 #endif
1509                 kobject_put(&queue->kobj);
1510         }
1511
1512         return error;
1513 #else
1514         return 0;
1515 #endif /* CONFIG_SYSFS */
1516 }
1517
1518 static int register_queue_kobjects(struct net_device *dev)
1519 {
1520         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1521
1522 #ifdef CONFIG_SYSFS
1523         dev->queues_kset = kset_create_and_add("queues",
1524                                                NULL, &dev->dev.kobj);
1525         if (!dev->queues_kset)
1526                 return -ENOMEM;
1527         real_rx = dev->real_num_rx_queues;
1528 #endif
1529         real_tx = dev->real_num_tx_queues;
1530
1531         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1532         if (error)
1533                 goto error;
1534         rxq = real_rx;
1535
1536         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1537         if (error)
1538                 goto error;
1539         txq = real_tx;
1540
1541         return 0;
1542
1543 error:
1544         netdev_queue_update_kobjects(dev, txq, 0);
1545         net_rx_queue_update_kobjects(dev, rxq, 0);
1546 #ifdef CONFIG_SYSFS
1547         kset_unregister(dev->queues_kset);
1548 #endif
1549         return error;
1550 }
1551
1552 static void remove_queue_kobjects(struct net_device *dev)
1553 {
1554         int real_rx = 0, real_tx = 0;
1555
1556 #ifdef CONFIG_SYSFS
1557         real_rx = dev->real_num_rx_queues;
1558 #endif
1559         real_tx = dev->real_num_tx_queues;
1560
1561         net_rx_queue_update_kobjects(dev, real_rx, 0);
1562         netdev_queue_update_kobjects(dev, real_tx, 0);
1563 #ifdef CONFIG_SYSFS
1564         kset_unregister(dev->queues_kset);
1565 #endif
1566 }
1567
1568 static bool net_current_may_mount(void)
1569 {
1570         struct net *net = current->nsproxy->net_ns;
1571
1572         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1573 }
1574
1575 static void *net_grab_current_ns(void)
1576 {
1577         struct net *ns = current->nsproxy->net_ns;
1578 #ifdef CONFIG_NET_NS
1579         if (ns)
1580                 refcount_inc(&ns->passive);
1581 #endif
1582         return ns;
1583 }
1584
1585 static const void *net_initial_ns(void)
1586 {
1587         return &init_net;
1588 }
1589
1590 static const void *net_netlink_ns(struct sock *sk)
1591 {
1592         return sock_net(sk);
1593 }
1594
1595 const struct kobj_ns_type_operations net_ns_type_operations = {
1596         .type = KOBJ_NS_TYPE_NET,
1597         .current_may_mount = net_current_may_mount,
1598         .grab_current_ns = net_grab_current_ns,
1599         .netlink_ns = net_netlink_ns,
1600         .initial_ns = net_initial_ns,
1601         .drop_ns = net_drop_ns,
1602 };
1603 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1604
1605 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1606 {
1607         struct net_device *dev = to_net_dev(d);
1608         int retval;
1609
1610         /* pass interface to uevent. */
1611         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1612         if (retval)
1613                 goto exit;
1614
1615         /* pass ifindex to uevent.
1616          * ifindex is useful as it won't change (interface name may change)
1617          * and is what RtNetlink uses natively.
1618          */
1619         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1620
1621 exit:
1622         return retval;
1623 }
1624
1625 /*
1626  *      netdev_release -- destroy and free a dead device.
1627  *      Called when last reference to device kobject is gone.
1628  */
1629 static void netdev_release(struct device *d)
1630 {
1631         struct net_device *dev = to_net_dev(d);
1632
1633         BUG_ON(dev->reg_state != NETREG_RELEASED);
1634
1635         /* no need to wait for rcu grace period:
1636          * device is dead and about to be freed.
1637          */
1638         kfree(rcu_access_pointer(dev->ifalias));
1639         netdev_freemem(dev);
1640 }
1641
1642 static const void *net_namespace(struct device *d)
1643 {
1644         struct net_device *dev = to_net_dev(d);
1645
1646         return dev_net(dev);
1647 }
1648
1649 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1650 {
1651         struct net_device *dev = to_net_dev(d);
1652         const struct net *net = dev_net(dev);
1653
1654         net_ns_get_ownership(net, uid, gid);
1655 }
1656
1657 static struct class net_class __ro_after_init = {
1658         .name = "net",
1659         .dev_release = netdev_release,
1660         .dev_groups = net_class_groups,
1661         .dev_uevent = netdev_uevent,
1662         .ns_type = &net_ns_type_operations,
1663         .namespace = net_namespace,
1664         .get_ownership = net_get_ownership,
1665 };
1666
1667 #ifdef CONFIG_OF_NET
1668 static int of_dev_node_match(struct device *dev, const void *data)
1669 {
1670         int ret = 0;
1671
1672         if (dev->parent)
1673                 ret = dev->parent->of_node == data;
1674
1675         return ret == 0 ? dev->of_node == data : ret;
1676 }
1677
1678 /*
1679  * of_find_net_device_by_node - lookup the net device for the device node
1680  * @np: OF device node
1681  *
1682  * Looks up the net_device structure corresponding with the device node.
1683  * If successful, returns a pointer to the net_device with the embedded
1684  * struct device refcount incremented by one, or NULL on failure. The
1685  * refcount must be dropped when done with the net_device.
1686  */
1687 struct net_device *of_find_net_device_by_node(struct device_node *np)
1688 {
1689         struct device *dev;
1690
1691         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1692         if (!dev)
1693                 return NULL;
1694
1695         return to_net_dev(dev);
1696 }
1697 EXPORT_SYMBOL(of_find_net_device_by_node);
1698 #endif
1699
1700 /* Delete sysfs entries but hold kobject reference until after all
1701  * netdev references are gone.
1702  */
1703 void netdev_unregister_kobject(struct net_device *ndev)
1704 {
1705         struct device *dev = &ndev->dev;
1706
1707         if (!refcount_read(&dev_net(ndev)->count))
1708                 dev_set_uevent_suppress(dev, 1);
1709
1710         kobject_get(&dev->kobj);
1711
1712         remove_queue_kobjects(ndev);
1713
1714         pm_runtime_set_memalloc_noio(dev, false);
1715
1716         device_del(dev);
1717 }
1718
1719 /* Create sysfs entries for network device. */
1720 int netdev_register_kobject(struct net_device *ndev)
1721 {
1722         struct device *dev = &ndev->dev;
1723         const struct attribute_group **groups = ndev->sysfs_groups;
1724         int error = 0;
1725
1726         device_initialize(dev);
1727         dev->class = &net_class;
1728         dev->platform_data = ndev;
1729         dev->groups = groups;
1730
1731         dev_set_name(dev, "%s", ndev->name);
1732
1733 #ifdef CONFIG_SYSFS
1734         /* Allow for a device specific group */
1735         if (*groups)
1736                 groups++;
1737
1738         *groups++ = &netstat_group;
1739
1740 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1741         if (ndev->ieee80211_ptr)
1742                 *groups++ = &wireless_group;
1743 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1744         else if (ndev->wireless_handlers)
1745                 *groups++ = &wireless_group;
1746 #endif
1747 #endif
1748 #endif /* CONFIG_SYSFS */
1749
1750         error = device_add(dev);
1751         if (error)
1752                 return error;
1753
1754         error = register_queue_kobjects(ndev);
1755         if (error) {
1756                 device_del(dev);
1757                 return error;
1758         }
1759
1760         pm_runtime_set_memalloc_noio(dev, true);
1761
1762         return error;
1763 }
1764
1765 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1766                                 const void *ns)
1767 {
1768         return class_create_file_ns(&net_class, class_attr, ns);
1769 }
1770 EXPORT_SYMBOL(netdev_class_create_file_ns);
1771
1772 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1773                                  const void *ns)
1774 {
1775         class_remove_file_ns(&net_class, class_attr, ns);
1776 }
1777 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1778
1779 int __init netdev_kobject_init(void)
1780 {
1781         kobj_ns_type_register(&net_ns_type_operations);
1782         return class_register(&net_class);
1783 }