net/core/net-sysfs.c

   1 /*
   2  * net-sysfs.c - network device class and attributes
   3  *
   4  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/capability.h>
  13 #include <linux/kernel.h>
  14 #include <linux/netdevice.h>
  15 #include <net/switchdev.h>
  16 #include <linux/if_arp.h>
  17 #include <linux/slab.h>
  18 #include <linux/sched/signal.h>
  19 #include <linux/nsproxy.h>
  20 #include <net/sock.h>
  21 #include <net/net_namespace.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/vmalloc.h>
  24 #include <linux/export.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/pm_runtime.h>
  27 #include <linux/of.h>
  28 #include <linux/of_net.h>
  29 #include <linux/cpu.h>
  30
  31 #include "net-sysfs.h"
  32
  33 #ifdef CONFIG_SYSFS
  34 static const char fmt_hex[] = "%#x\n";
  35 static const char fmt_dec[] = "%d\n";
  36 static const char fmt_ulong[] = "%lu\n";
  37 static const char fmt_u64[] = "%llu\n";
  38
  39 static inline int dev_isalive(const struct net_device *dev)
  40 {
  41         return dev->reg_state <= NETREG_REGISTERED;
  42 }
  43
  44 /* use same locking rules as GIF* ioctl's */
  45 static ssize_t netdev_show(const struct device *dev,
  46                            struct device_attribute *attr, char *buf,
  47                            ssize_t (*format)(const struct net_device *, char *))
  48 {
  49         struct net_device *ndev = to_net_dev(dev);
  50         ssize_t ret = -EINVAL;
  51
  52         read_lock(&dev_base_lock);
  53         if (dev_isalive(ndev))
  54                 ret = (*format)(ndev, buf);
  55         read_unlock(&dev_base_lock);
  56
  57         return ret;
  58 }
  59
  60 /* generate a show function for simple field */
  61 #define NETDEVICE_SHOW(field, format_string)                            \
  62 static ssize_t format_##field(const struct net_device *dev, char *buf)  \
  63 {                                                                       \
  64         return sprintf(buf, format_string, dev->field);                 \
  65 }                                                                       \
  66 static ssize_t field##_show(struct device *dev,                         \
  67                             struct device_attribute *attr, char *buf)   \
  68 {                                                                       \
  69         return netdev_show(dev, attr, buf, format_##field);             \
  70 }                                                                       \
  71
  72 #define NETDEVICE_SHOW_RO(field, format_string)                         \
  73 NETDEVICE_SHOW(field, format_string);                                   \
  74 static DEVICE_ATTR_RO(field)
  75
  76 #define NETDEVICE_SHOW_RW(field, format_string)                         \
  77 NETDEVICE_SHOW(field, format_string);                                   \
  78 static DEVICE_ATTR_RW(field)
  79
  80 /* use same locking and permission rules as SIF* ioctl's */
  81 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  82                             const char *buf, size_t len,
  83                             int (*set)(struct net_device *, unsigned long))
  84 {
  85         struct net_device *netdev = to_net_dev(dev);
  86         struct net *net = dev_net(netdev);
  87         unsigned long new;
  88         int ret = -EINVAL;
  89
  90         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  91                 return -EPERM;
  92
  93         ret = kstrtoul(buf, 0, &new);
  94         if (ret)
  95                 goto err;
  96
  97         if (!rtnl_trylock())
  98                 return restart_syscall();
  99
 100         if (dev_isalive(netdev)) {
 101                 ret = (*set)(netdev, new);
 102                 if (ret == 0)
 103                         ret = len;
 104         }
 105         rtnl_unlock();
 106  err:
 107         return ret;
 108 }
 109
 110 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 111 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 112 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 113 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 114 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 115 NETDEVICE_SHOW_RO(type, fmt_dec);
 116 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 117
 118 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
 119                            char *buf)
 120 {
 121         struct net_device *ndev = to_net_dev(dev);
 122
 123         return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
 124 }
 125 static DEVICE_ATTR_RO(iflink);
 126
 127 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 128 {
 129         return sprintf(buf, fmt_dec, dev->name_assign_type);
 130 }
 131
 132 static ssize_t name_assign_type_show(struct device *dev,
 133                                      struct device_attribute *attr,
 134                                      char *buf)
 135 {
 136         struct net_device *ndev = to_net_dev(dev);
 137         ssize_t ret = -EINVAL;
 138
 139         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
 140                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
 141
 142         return ret;
 143 }
 144 static DEVICE_ATTR_RO(name_assign_type);
 145
 146 /* use same locking rules as GIFHWADDR ioctl's */
 147 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 148                             char *buf)
 149 {
 150         struct net_device *ndev = to_net_dev(dev);
 151         ssize_t ret = -EINVAL;
 152
 153         read_lock(&dev_base_lock);
 154         if (dev_isalive(ndev))
 155                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 156         read_unlock(&dev_base_lock);
 157         return ret;
 158 }
 159 static DEVICE_ATTR_RO(address);
 160
 161 static ssize_t broadcast_show(struct device *dev,
 162                               struct device_attribute *attr, char *buf)
 163 {
 164         struct net_device *ndev = to_net_dev(dev);
 165
 166         if (dev_isalive(ndev))
 167                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
 168         return -EINVAL;
 169 }
 170 static DEVICE_ATTR_RO(broadcast);
 171
 172 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
 173 {
 174         if (!netif_running(dev))
 175                 return -EINVAL;
 176         return dev_change_carrier(dev, (bool)new_carrier);
 177 }
 178
 179 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 180                              const char *buf, size_t len)
 181 {
 182         return netdev_store(dev, attr, buf, len, change_carrier);
 183 }
 184
 185 static ssize_t carrier_show(struct device *dev,
 186                             struct device_attribute *attr, char *buf)
 187 {
 188         struct net_device *netdev = to_net_dev(dev);
 189
 190         if (netif_running(netdev))
 191                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 192
 193         return -EINVAL;
 194 }
 195 static DEVICE_ATTR_RW(carrier);
 196
 197 static ssize_t speed_show(struct device *dev,
 198                           struct device_attribute *attr, char *buf)
 199 {
 200         struct net_device *netdev = to_net_dev(dev);
 201         int ret = -EINVAL;
 202
 203         if (!rtnl_trylock())
 204                 return restart_syscall();
 205
 206         if (netif_running(netdev)) {
 207                 struct ethtool_link_ksettings cmd;
 208
 209                 if (!__ethtool_get_link_ksettings(netdev, &cmd))
 210                         ret = sprintf(buf, fmt_dec, cmd.base.speed);
 211         }
 212         rtnl_unlock();
 213         return ret;
 214 }
 215 static DEVICE_ATTR_RO(speed);
 216
 217 static ssize_t duplex_show(struct device *dev,
 218                            struct device_attribute *attr, char *buf)
 219 {
 220         struct net_device *netdev = to_net_dev(dev);
 221         int ret = -EINVAL;
 222
 223         if (!rtnl_trylock())
 224                 return restart_syscall();
 225
 226         if (netif_running(netdev)) {
 227                 struct ethtool_link_ksettings cmd;
 228
 229                 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
 230                         const char *duplex;
 231
 232                         switch (cmd.base.duplex) {
 233                         case DUPLEX_HALF:
 234                                 duplex = "half";
 235                                 break;
 236                         case DUPLEX_FULL:
 237                                 duplex = "full";
 238                                 break;
 239                         default:
 240                                 duplex = "unknown";
 241                                 break;
 242                         }
 243                         ret = sprintf(buf, "%s\n", duplex);
 244                 }
 245         }
 246         rtnl_unlock();
 247         return ret;
 248 }
 249 static DEVICE_ATTR_RO(duplex);
 250
 251 static ssize_t dormant_show(struct device *dev,
 252                             struct device_attribute *attr, char *buf)
 253 {
 254         struct net_device *netdev = to_net_dev(dev);
 255
 256         if (netif_running(netdev))
 257                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 258
 259         return -EINVAL;
 260 }
 261 static DEVICE_ATTR_RO(dormant);
 262
 263 static const char *const operstates[] = {
 264         "unknown",
 265         "notpresent", /* currently unused */
 266         "down",
 267         "lowerlayerdown",
 268         "testing", /* currently unused */
 269         "dormant",
 270         "up"
 271 };
 272
 273 static ssize_t operstate_show(struct device *dev,
 274                               struct device_attribute *attr, char *buf)
 275 {
 276         const struct net_device *netdev = to_net_dev(dev);
 277         unsigned char operstate;
 278
 279         read_lock(&dev_base_lock);
 280         operstate = netdev->operstate;
 281         if (!netif_running(netdev))
 282                 operstate = IF_OPER_DOWN;
 283         read_unlock(&dev_base_lock);
 284
 285         if (operstate >= ARRAY_SIZE(operstates))
 286                 return -EINVAL; /* should not happen */
 287
 288         return sprintf(buf, "%s\n", operstates[operstate]);
 289 }
 290 static DEVICE_ATTR_RO(operstate);
 291
 292 static ssize_t carrier_changes_show(struct device *dev,
 293                                     struct device_attribute *attr,
 294                                     char *buf)
 295 {
 296         struct net_device *netdev = to_net_dev(dev);
 297
 298         return sprintf(buf, fmt_dec,
 299                        atomic_read(&netdev->carrier_up_count) +
 300                        atomic_read(&netdev->carrier_down_count));
 301 }
 302 static DEVICE_ATTR_RO(carrier_changes);
 303
 304 static ssize_t carrier_up_count_show(struct device *dev,
 305                                      struct device_attribute *attr,
 306                                      char *buf)
 307 {
 308         struct net_device *netdev = to_net_dev(dev);
 309
 310         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
 311 }
 312 static DEVICE_ATTR_RO(carrier_up_count);
 313
 314 static ssize_t carrier_down_count_show(struct device *dev,
 315                                        struct device_attribute *attr,
 316                                        char *buf)
 317 {
 318         struct net_device *netdev = to_net_dev(dev);
 319
 320         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
 321 }
 322 static DEVICE_ATTR_RO(carrier_down_count);
 323
 324 /* read-write attributes */
 325
 326 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 327 {
 328         return dev_set_mtu(dev, (int)new_mtu);
 329 }
 330
 331 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 332                          const char *buf, size_t len)
 333 {
 334         return netdev_store(dev, attr, buf, len, change_mtu);
 335 }
 336 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 337
 338 static int change_flags(struct net_device *dev, unsigned long new_flags)
 339 {
 340         return dev_change_flags(dev, (unsigned int)new_flags);
 341 }
 342
 343 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 344                            const char *buf, size_t len)
 345 {
 346         return netdev_store(dev, attr, buf, len, change_flags);
 347 }
 348 NETDEVICE_SHOW_RW(flags, fmt_hex);
 349
 350 static ssize_t tx_queue_len_store(struct device *dev,
 351                                   struct device_attribute *attr,
 352                                   const char *buf, size_t len)
 353 {
 354         if (!capable(CAP_NET_ADMIN))
 355                 return -EPERM;
 356
 357         return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
 358 }
 359 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
 360
 361 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 362 {
 363         dev->gro_flush_timeout = val;
 364         return 0;
 365 }
 366
 367 static ssize_t gro_flush_timeout_store(struct device *dev,
 368                                        struct device_attribute *attr,
 369                                        const char *buf, size_t len)
 370 {
 371         if (!capable(CAP_NET_ADMIN))
 372                 return -EPERM;
 373
 374         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 375 }
 376 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 377
 378 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 379                              const char *buf, size_t len)
 380 {
 381         struct net_device *netdev = to_net_dev(dev);
 382         struct net *net = dev_net(netdev);
 383         size_t count = len;
 384         ssize_t ret = 0;
 385
 386         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 387                 return -EPERM;
 388
 389         /* ignore trailing newline */
 390         if (len >  0 && buf[len - 1] == '\n')
 391                 --count;
 392
 393         if (!rtnl_trylock())
 394                 return restart_syscall();
 395
 396         if (dev_isalive(netdev)) {
 397                 ret = dev_set_alias(netdev, buf, count);
 398                 if (ret < 0)
 399                         goto err;
 400                 ret = len;
 401                 netdev_state_change(netdev);
 402         }
 403 err:
 404         rtnl_unlock();
 405
 406         return ret;
 407 }
 408
 409 static ssize_t ifalias_show(struct device *dev,
 410                             struct device_attribute *attr, char *buf)
 411 {
 412         const struct net_device *netdev = to_net_dev(dev);
 413         char tmp[IFALIASZ];
 414         ssize_t ret = 0;
 415
 416         ret = dev_get_alias(netdev, tmp, sizeof(tmp));
 417         if (ret > 0)
 418                 ret = sprintf(buf, "%s\n", tmp);
 419         return ret;
 420 }
 421 static DEVICE_ATTR_RW(ifalias);
 422
 423 static int change_group(struct net_device *dev, unsigned long new_group)
 424 {
 425         dev_set_group(dev, (int)new_group);
 426         return 0;
 427 }
 428
 429 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 430                            const char *buf, size_t len)
 431 {
 432         return netdev_store(dev, attr, buf, len, change_group);
 433 }
 434 NETDEVICE_SHOW(group, fmt_dec);
 435 static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
 436
 437 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 438 {
 439         return dev_change_proto_down(dev, (bool)proto_down);
 440 }
 441
 442 static ssize_t proto_down_store(struct device *dev,
 443                                 struct device_attribute *attr,
 444                                 const char *buf, size_t len)
 445 {
 446         return netdev_store(dev, attr, buf, len, change_proto_down);
 447 }
 448 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 449
 450 static ssize_t phys_port_id_show(struct device *dev,
 451                                  struct device_attribute *attr, char *buf)
 452 {
 453         struct net_device *netdev = to_net_dev(dev);
 454         ssize_t ret = -EINVAL;
 455
 456         if (!rtnl_trylock())
 457                 return restart_syscall();
 458
 459         if (dev_isalive(netdev)) {
 460                 struct netdev_phys_item_id ppid;
 461
 462                 ret = dev_get_phys_port_id(netdev, &ppid);
 463                 if (!ret)
 464                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 465         }
 466         rtnl_unlock();
 467
 468         return ret;
 469 }
 470 static DEVICE_ATTR_RO(phys_port_id);
 471
 472 static ssize_t phys_port_name_show(struct device *dev,
 473                                    struct device_attribute *attr, char *buf)
 474 {
 475         struct net_device *netdev = to_net_dev(dev);
 476         ssize_t ret = -EINVAL;
 477
 478         if (!rtnl_trylock())
 479                 return restart_syscall();
 480
 481         if (dev_isalive(netdev)) {
 482                 char name[IFNAMSIZ];
 483
 484                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 485                 if (!ret)
 486                         ret = sprintf(buf, "%s\n", name);
 487         }
 488         rtnl_unlock();
 489
 490         return ret;
 491 }
 492 static DEVICE_ATTR_RO(phys_port_name);
 493
 494 static ssize_t phys_switch_id_show(struct device *dev,
 495                                    struct device_attribute *attr, char *buf)
 496 {
 497         struct net_device *netdev = to_net_dev(dev);
 498         ssize_t ret = -EINVAL;
 499
 500         if (!rtnl_trylock())
 501                 return restart_syscall();
 502
 503         if (dev_isalive(netdev)) {
 504                 struct switchdev_attr attr = {
 505                         .orig_dev = netdev,
 506                         .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
 507                         .flags = SWITCHDEV_F_NO_RECURSE,
 508                 };
 509
 510                 ret = switchdev_port_attr_get(netdev, &attr);
 511                 if (!ret)
 512                         ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len,
 513                                       attr.u.ppid.id);
 514         }
 515         rtnl_unlock();
 516
 517         return ret;
 518 }
 519 static DEVICE_ATTR_RO(phys_switch_id);
 520
 521 static struct attribute *net_class_attrs[] __ro_after_init = {
 522         &dev_attr_netdev_group.attr,
 523         &dev_attr_type.attr,
 524         &dev_attr_dev_id.attr,
 525         &dev_attr_dev_port.attr,
 526         &dev_attr_iflink.attr,
 527         &dev_attr_ifindex.attr,
 528         &dev_attr_name_assign_type.attr,
 529         &dev_attr_addr_assign_type.attr,
 530         &dev_attr_addr_len.attr,
 531         &dev_attr_link_mode.attr,
 532         &dev_attr_address.attr,
 533         &dev_attr_broadcast.attr,
 534         &dev_attr_speed.attr,
 535         &dev_attr_duplex.attr,
 536         &dev_attr_dormant.attr,
 537         &dev_attr_operstate.attr,
 538         &dev_attr_carrier_changes.attr,
 539         &dev_attr_ifalias.attr,
 540         &dev_attr_carrier.attr,
 541         &dev_attr_mtu.attr,
 542         &dev_attr_flags.attr,
 543         &dev_attr_tx_queue_len.attr,
 544         &dev_attr_gro_flush_timeout.attr,
 545         &dev_attr_phys_port_id.attr,
 546         &dev_attr_phys_port_name.attr,
 547         &dev_attr_phys_switch_id.attr,
 548         &dev_attr_proto_down.attr,
 549         &dev_attr_carrier_up_count.attr,
 550         &dev_attr_carrier_down_count.attr,
 551         NULL,
 552 };
 553 ATTRIBUTE_GROUPS(net_class);
 554
 555 /* Show a given an attribute in the statistics group */
 556 static ssize_t netstat_show(const struct device *d,
 557                             struct device_attribute *attr, char *buf,
 558                             unsigned long offset)
 559 {
 560         struct net_device *dev = to_net_dev(d);
 561         ssize_t ret = -EINVAL;
 562
 563         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 564                 offset % sizeof(u64) != 0);
 565
 566         read_lock(&dev_base_lock);
 567         if (dev_isalive(dev)) {
 568                 struct rtnl_link_stats64 temp;
 569                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 570
 571                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
 572         }
 573         read_unlock(&dev_base_lock);
 574         return ret;
 575 }
 576
 577 /* generate a read-only statistics attribute */
 578 #define NETSTAT_ENTRY(name)                                             \
 579 static ssize_t name##_show(struct device *d,                            \
 580                            struct device_attribute *attr, char *buf)    \
 581 {                                                                       \
 582         return netstat_show(d, attr, buf,                               \
 583                             offsetof(struct rtnl_link_stats64, name));  \
 584 }                                                                       \
 585 static DEVICE_ATTR_RO(name)
 586
 587 NETSTAT_ENTRY(rx_packets);
 588 NETSTAT_ENTRY(tx_packets);
 589 NETSTAT_ENTRY(rx_bytes);
 590 NETSTAT_ENTRY(tx_bytes);
 591 NETSTAT_ENTRY(rx_errors);
 592 NETSTAT_ENTRY(tx_errors);
 593 NETSTAT_ENTRY(rx_dropped);
 594 NETSTAT_ENTRY(tx_dropped);
 595 NETSTAT_ENTRY(multicast);
 596 NETSTAT_ENTRY(collisions);
 597 NETSTAT_ENTRY(rx_length_errors);
 598 NETSTAT_ENTRY(rx_over_errors);
 599 NETSTAT_ENTRY(rx_crc_errors);
 600 NETSTAT_ENTRY(rx_frame_errors);
 601 NETSTAT_ENTRY(rx_fifo_errors);
 602 NETSTAT_ENTRY(rx_missed_errors);
 603 NETSTAT_ENTRY(tx_aborted_errors);
 604 NETSTAT_ENTRY(tx_carrier_errors);
 605 NETSTAT_ENTRY(tx_fifo_errors);
 606 NETSTAT_ENTRY(tx_heartbeat_errors);
 607 NETSTAT_ENTRY(tx_window_errors);
 608 NETSTAT_ENTRY(rx_compressed);
 609 NETSTAT_ENTRY(tx_compressed);
 610 NETSTAT_ENTRY(rx_nohandler);
 611
 612 static struct attribute *netstat_attrs[] __ro_after_init = {
 613         &dev_attr_rx_packets.attr,
 614         &dev_attr_tx_packets.attr,
 615         &dev_attr_rx_bytes.attr,
 616         &dev_attr_tx_bytes.attr,
 617         &dev_attr_rx_errors.attr,
 618         &dev_attr_tx_errors.attr,
 619         &dev_attr_rx_dropped.attr,
 620         &dev_attr_tx_dropped.attr,
 621         &dev_attr_multicast.attr,
 622         &dev_attr_collisions.attr,
 623         &dev_attr_rx_length_errors.attr,
 624         &dev_attr_rx_over_errors.attr,
 625         &dev_attr_rx_crc_errors.attr,
 626         &dev_attr_rx_frame_errors.attr,
 627         &dev_attr_rx_fifo_errors.attr,
 628         &dev_attr_rx_missed_errors.attr,
 629         &dev_attr_tx_aborted_errors.attr,
 630         &dev_attr_tx_carrier_errors.attr,
 631         &dev_attr_tx_fifo_errors.attr,
 632         &dev_attr_tx_heartbeat_errors.attr,
 633         &dev_attr_tx_window_errors.attr,
 634         &dev_attr_rx_compressed.attr,
 635         &dev_attr_tx_compressed.attr,
 636         &dev_attr_rx_nohandler.attr,
 637         NULL
 638 };
 639
 640 static const struct attribute_group netstat_group = {
 641         .name  = "statistics",
 642         .attrs  = netstat_attrs,
 643 };
 644
 645 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 646 static struct attribute *wireless_attrs[] = {
 647         NULL
 648 };
 649
 650 static const struct attribute_group wireless_group = {
 651         .name = "wireless",
 652         .attrs = wireless_attrs,
 653 };
 654 #endif
 655
 656 #else /* CONFIG_SYSFS */
 657 #define net_class_groups        NULL
 658 #endif /* CONFIG_SYSFS */
 659
 660 #ifdef CONFIG_SYSFS
 661 #define to_rx_queue_attr(_attr) \
 662         container_of(_attr, struct rx_queue_attribute, attr)
 663
 664 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 665
 666 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 667                                   char *buf)
 668 {
 669         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 670         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 671
 672         if (!attribute->show)
 673                 return -EIO;
 674
 675         return attribute->show(queue, buf);
 676 }
 677
 678 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 679                                    const char *buf, size_t count)
 680 {
 681         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 682         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 683
 684         if (!attribute->store)
 685                 return -EIO;
 686
 687         return attribute->store(queue, buf, count);
 688 }
 689
 690 static const struct sysfs_ops rx_queue_sysfs_ops = {
 691         .show = rx_queue_attr_show,
 692         .store = rx_queue_attr_store,
 693 };
 694
 695 #ifdef CONFIG_RPS
 696 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
 697 {
 698         struct rps_map *map;
 699         cpumask_var_t mask;
 700         int i, len;
 701
 702         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 703                 return -ENOMEM;
 704
 705         rcu_read_lock();
 706         map = rcu_dereference(queue->rps_map);
 707         if (map)
 708                 for (i = 0; i < map->len; i++)
 709                         cpumask_set_cpu(map->cpus[i], mask);
 710
 711         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 712         rcu_read_unlock();
 713         free_cpumask_var(mask);
 714
 715         return len < PAGE_SIZE ? len : -EINVAL;
 716 }
 717
 718 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 719                              const char *buf, size_t len)
 720 {
 721         struct rps_map *old_map, *map;
 722         cpumask_var_t mask;
 723         int err, cpu, i;
 724         static DEFINE_MUTEX(rps_map_mutex);
 725
 726         if (!capable(CAP_NET_ADMIN))
 727                 return -EPERM;
 728
 729         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 730                 return -ENOMEM;
 731
 732         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 733         if (err) {
 734                 free_cpumask_var(mask);
 735                 return err;
 736         }
 737
 738         map = kzalloc(max_t(unsigned int,
 739                             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 740                       GFP_KERNEL);
 741         if (!map) {
 742                 free_cpumask_var(mask);
 743                 return -ENOMEM;
 744         }
 745
 746         i = 0;
 747         for_each_cpu_and(cpu, mask, cpu_online_mask)
 748                 map->cpus[i++] = cpu;
 749
 750         if (i) {
 751                 map->len = i;
 752         } else {
 753                 kfree(map);
 754                 map = NULL;
 755         }
 756
 757         mutex_lock(&rps_map_mutex);
 758         old_map = rcu_dereference_protected(queue->rps_map,
 759                                             mutex_is_locked(&rps_map_mutex));
 760         rcu_assign_pointer(queue->rps_map, map);
 761
 762         if (map)
 763                 static_key_slow_inc(&rps_needed);
 764         if (old_map)
 765                 static_key_slow_dec(&rps_needed);
 766
 767         mutex_unlock(&rps_map_mutex);
 768
 769         if (old_map)
 770                 kfree_rcu(old_map, rcu);
 771
 772         free_cpumask_var(mask);
 773         return len;
 774 }
 775
 776 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 777                                            char *buf)
 778 {
 779         struct rps_dev_flow_table *flow_table;
 780         unsigned long val = 0;
 781
 782         rcu_read_lock();
 783         flow_table = rcu_dereference(queue->rps_flow_table);
 784         if (flow_table)
 785                 val = (unsigned long)flow_table->mask + 1;
 786         rcu_read_unlock();
 787
 788         return sprintf(buf, "%lu\n", val);
 789 }
 790
 791 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 792 {
 793         struct rps_dev_flow_table *table = container_of(rcu,
 794             struct rps_dev_flow_table, rcu);
 795         vfree(table);
 796 }
 797
 798 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 799                                             const char *buf, size_t len)
 800 {
 801         unsigned long mask, count;
 802         struct rps_dev_flow_table *table, *old_table;
 803         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 804         int rc;
 805
 806         if (!capable(CAP_NET_ADMIN))
 807                 return -EPERM;
 808
 809         rc = kstrtoul(buf, 0, &count);
 810         if (rc < 0)
 811                 return rc;
 812
 813         if (count) {
 814                 mask = count - 1;
 815                 /* mask = roundup_pow_of_two(count) - 1;
 816                  * without overflows...
 817                  */
 818                 while ((mask | (mask >> 1)) != mask)
 819                         mask |= (mask >> 1);
 820                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 821                  * and on 32bit arches, must check
 822                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 823                  */
 824 #if BITS_PER_LONG > 32
 825                 if (mask > (unsigned long)(u32)mask)
 826                         return -EINVAL;
 827 #else
 828                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 829                                 / sizeof(struct rps_dev_flow)) {
 830                         /* Enforce a limit to prevent overflow */
 831                         return -EINVAL;
 832                 }
 833 #endif
 834                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 835                 if (!table)
 836                         return -ENOMEM;
 837
 838                 table->mask = mask;
 839                 for (count = 0; count <= mask; count++)
 840                         table->flows[count].cpu = RPS_NO_CPU;
 841         } else {
 842                 table = NULL;
 843         }
 844
 845         spin_lock(&rps_dev_flow_lock);
 846         old_table = rcu_dereference_protected(queue->rps_flow_table,
 847                                               lockdep_is_held(&rps_dev_flow_lock));
 848         rcu_assign_pointer(queue->rps_flow_table, table);
 849         spin_unlock(&rps_dev_flow_lock);
 850
 851         if (old_table)
 852                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 853
 854         return len;
 855 }
 856
 857 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
 858         = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
 859
 860 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
 861         = __ATTR(rps_flow_cnt, 0644,
 862                  show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 863 #endif /* CONFIG_RPS */
 864
 865 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
 866 #ifdef CONFIG_RPS
 867         &rps_cpus_attribute.attr,
 868         &rps_dev_flow_table_cnt_attribute.attr,
 869 #endif
 870         NULL
 871 };
 872
 873 static void rx_queue_release(struct kobject *kobj)
 874 {
 875         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 876 #ifdef CONFIG_RPS
 877         struct rps_map *map;
 878         struct rps_dev_flow_table *flow_table;
 879
 880         map = rcu_dereference_protected(queue->rps_map, 1);
 881         if (map) {
 882                 RCU_INIT_POINTER(queue->rps_map, NULL);
 883                 kfree_rcu(map, rcu);
 884         }
 885
 886         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 887         if (flow_table) {
 888                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 889                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 890         }
 891 #endif
 892
 893         memset(kobj, 0, sizeof(*kobj));
 894         dev_put(queue->dev);
 895 }
 896
 897 static const void *rx_queue_namespace(struct kobject *kobj)
 898 {
 899         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 900         struct device *dev = &queue->dev->dev;
 901         const void *ns = NULL;
 902
 903         if (dev->class && dev->class->ns_type)
 904                 ns = dev->class->namespace(dev);
 905
 906         return ns;
 907 }
 908
 909 static void rx_queue_get_ownership(struct kobject *kobj,
 910                                    kuid_t *uid, kgid_t *gid)
 911 {
 912         const struct net *net = rx_queue_namespace(kobj);
 913
 914         net_ns_get_ownership(net, uid, gid);
 915 }
 916
 917 static struct kobj_type rx_queue_ktype __ro_after_init = {
 918         .sysfs_ops = &rx_queue_sysfs_ops,
 919         .release = rx_queue_release,
 920         .default_attrs = rx_queue_default_attrs,
 921         .namespace = rx_queue_namespace,
 922         .get_ownership = rx_queue_get_ownership,
 923 };
 924
 925 static int rx_queue_add_kobject(struct net_device *dev, int index)
 926 {
 927         struct netdev_rx_queue *queue = dev->_rx + index;
 928         struct kobject *kobj = &queue->kobj;
 929         int error = 0;
 930
 931         /* Kobject_put later will trigger rx_queue_release call which
 932          * decreases dev refcount: Take that reference here
 933          */
 934         dev_hold(queue->dev);
 935
 936         kobj->kset = dev->queues_kset;
 937         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 938                                      "rx-%u", index);
 939         if (error)
 940                 goto err;
 941
 942         if (dev->sysfs_rx_queue_group) {
 943                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
 944                 if (error)
 945                         goto err;
 946         }
 947
 948         kobject_uevent(kobj, KOBJ_ADD);
 949
 950         return error;
 951
 952 err:
 953         kobject_put(kobj);
 954         return error;
 955 }
 956 #endif /* CONFIG_SYSFS */
 957
 958 int
 959 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
 960 {
 961 #ifdef CONFIG_SYSFS
 962         int i;
 963         int error = 0;
 964
 965 #ifndef CONFIG_RPS
 966         if (!dev->sysfs_rx_queue_group)
 967                 return 0;
 968 #endif
 969         for (i = old_num; i < new_num; i++) {
 970                 error = rx_queue_add_kobject(dev, i);
 971                 if (error) {
 972                         new_num = old_num;
 973                         break;
 974                 }
 975         }
 976
 977         while (--i >= new_num) {
 978                 struct kobject *kobj = &dev->_rx[i].kobj;
 979
 980                 if (!refcount_read(&dev_net(dev)->count))
 981                         kobj->uevent_suppress = 1;
 982                 if (dev->sysfs_rx_queue_group)
 983                         sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
 984                 kobject_put(kobj);
 985         }
 986
 987         return error;
 988 #else
 989         return 0;
 990 #endif
 991 }
 992
 993 #ifdef CONFIG_SYSFS
 994 /*
 995  * netdev_queue sysfs structures and functions.
 996  */
 997 struct netdev_queue_attribute {
 998         struct attribute attr;
 999         ssize_t (*show)(struct netdev_queue *queue, char *buf);
1000         ssize_t (*store)(struct netdev_queue *queue,
1001                          const char *buf, size_t len);
1002 };
1003 #define to_netdev_queue_attr(_attr) \
1004         container_of(_attr, struct netdev_queue_attribute, attr)
1005
1006 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1007
1008 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1009                                       struct attribute *attr, char *buf)
1010 {
1011         const struct netdev_queue_attribute *attribute
1012                 = to_netdev_queue_attr(attr);
1013         struct netdev_queue *queue = to_netdev_queue(kobj);
1014
1015         if (!attribute->show)
1016                 return -EIO;
1017
1018         return attribute->show(queue, buf);
1019 }
1020
1021 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1022                                        struct attribute *attr,
1023                                        const char *buf, size_t count)
1024 {
1025         const struct netdev_queue_attribute *attribute
1026                 = to_netdev_queue_attr(attr);
1027         struct netdev_queue *queue = to_netdev_queue(kobj);
1028
1029         if (!attribute->store)
1030                 return -EIO;
1031
1032         return attribute->store(queue, buf, count);
1033 }
1034
1035 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1036         .show = netdev_queue_attr_show,
1037         .store = netdev_queue_attr_store,
1038 };
1039
1040 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1041 {
1042         unsigned long trans_timeout;
1043
1044         spin_lock_irq(&queue->_xmit_lock);
1045         trans_timeout = queue->trans_timeout;
1046         spin_unlock_irq(&queue->_xmit_lock);
1047
1048         return sprintf(buf, "%lu", trans_timeout);
1049 }
1050
1051 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1052 {
1053         struct net_device *dev = queue->dev;
1054         unsigned int i;
1055
1056         i = queue - dev->_tx;
1057         BUG_ON(i >= dev->num_tx_queues);
1058
1059         return i;
1060 }
1061
1062 static ssize_t traffic_class_show(struct netdev_queue *queue,
1063                                   char *buf)
1064 {
1065         struct net_device *dev = queue->dev;
1066         int index;
1067         int tc;
1068
1069         if (!netif_is_multiqueue(dev))
1070                 return -ENOENT;
1071
1072         index = get_netdev_queue_index(queue);
1073
1074         /* If queue belongs to subordinate dev use its TC mapping */
1075         dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1076
1077         tc = netdev_txq_to_tc(dev, index);
1078         if (tc < 0)
1079                 return -EINVAL;
1080
1081         /* We can report the traffic class one of two ways:
1082          * Subordinate device traffic classes are reported with the traffic
1083          * class first, and then the subordinate class so for example TC0 on
1084          * subordinate device 2 will be reported as "0-2". If the queue
1085          * belongs to the root device it will be reported with just the
1086          * traffic class, so just "0" for TC 0 for example.
1087          */
1088         return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) :
1089                                  sprintf(buf, "%u\n", tc);
1090 }
1091
1092 #ifdef CONFIG_XPS
1093 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1094                                char *buf)
1095 {
1096         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1097 }
1098
1099 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1100                                 const char *buf, size_t len)
1101 {
1102         struct net_device *dev = queue->dev;
1103         int err, index = get_netdev_queue_index(queue);
1104         u32 rate = 0;
1105
1106         if (!capable(CAP_NET_ADMIN))
1107                 return -EPERM;
1108
1109         err = kstrtou32(buf, 10, &rate);
1110         if (err < 0)
1111                 return err;
1112
1113         if (!rtnl_trylock())
1114                 return restart_syscall();
1115
1116         err = -EOPNOTSUPP;
1117         if (dev->netdev_ops->ndo_set_tx_maxrate)
1118                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1119
1120         rtnl_unlock();
1121         if (!err) {
1122                 queue->tx_maxrate = rate;
1123                 return len;
1124         }
1125         return err;
1126 }
1127
1128 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1129         = __ATTR_RW(tx_maxrate);
1130 #endif
1131
1132 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1133         = __ATTR_RO(tx_timeout);
1134
1135 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1136         = __ATTR_RO(traffic_class);
1137
1138 #ifdef CONFIG_BQL
1139 /*
1140  * Byte queue limits sysfs structures and functions.
1141  */
1142 static ssize_t bql_show(char *buf, unsigned int value)
1143 {
1144         return sprintf(buf, "%u\n", value);
1145 }
1146
1147 static ssize_t bql_set(const char *buf, const size_t count,
1148                        unsigned int *pvalue)
1149 {
1150         unsigned int value;
1151         int err;
1152
1153         if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1154                 value = DQL_MAX_LIMIT;
1155         } else {
1156                 err = kstrtouint(buf, 10, &value);
1157                 if (err < 0)
1158                         return err;
1159                 if (value > DQL_MAX_LIMIT)
1160                         return -EINVAL;
1161         }
1162
1163         *pvalue = value;
1164
1165         return count;
1166 }
1167
1168 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1169                                   char *buf)
1170 {
1171         struct dql *dql = &queue->dql;
1172
1173         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1174 }
1175
1176 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1177                                  const char *buf, size_t len)
1178 {
1179         struct dql *dql = &queue->dql;
1180         unsigned int value;
1181         int err;
1182
1183         err = kstrtouint(buf, 10, &value);
1184         if (err < 0)
1185                 return err;
1186
1187         dql->slack_hold_time = msecs_to_jiffies(value);
1188
1189         return len;
1190 }
1191
1192 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1193         = __ATTR(hold_time, 0644,
1194                  bql_show_hold_time, bql_set_hold_time);
1195
1196 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1197                                  char *buf)
1198 {
1199         struct dql *dql = &queue->dql;
1200
1201         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1202 }
1203
1204 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1205         __ATTR(inflight, 0444, bql_show_inflight, NULL);
1206
1207 #define BQL_ATTR(NAME, FIELD)                                           \
1208 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1209                                  char *buf)                             \
1210 {                                                                       \
1211         return bql_show(buf, queue->dql.FIELD);                         \
1212 }                                                                       \
1213                                                                         \
1214 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1215                                 const char *buf, size_t len)            \
1216 {                                                                       \
1217         return bql_set(buf, len, &queue->dql.FIELD);                    \
1218 }                                                                       \
1219                                                                         \
1220 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1221         = __ATTR(NAME, 0644,                            \
1222                  bql_show_ ## NAME, bql_set_ ## NAME)
1223
1224 BQL_ATTR(limit, limit);
1225 BQL_ATTR(limit_max, max_limit);
1226 BQL_ATTR(limit_min, min_limit);
1227
1228 static struct attribute *dql_attrs[] __ro_after_init = {
1229         &bql_limit_attribute.attr,
1230         &bql_limit_max_attribute.attr,
1231         &bql_limit_min_attribute.attr,
1232         &bql_hold_time_attribute.attr,
1233         &bql_inflight_attribute.attr,
1234         NULL
1235 };
1236
1237 static const struct attribute_group dql_group = {
1238         .name  = "byte_queue_limits",
1239         .attrs  = dql_attrs,
1240 };
1241 #endif /* CONFIG_BQL */
1242
1243 #ifdef CONFIG_XPS
1244 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1245                              char *buf)
1246 {
1247         struct net_device *dev = queue->dev;
1248         int cpu, len, num_tc = 1, tc = 0;
1249         struct xps_dev_maps *dev_maps;
1250         cpumask_var_t mask;
1251         unsigned long index;
1252
1253         if (!netif_is_multiqueue(dev))
1254                 return -ENOENT;
1255
1256         index = get_netdev_queue_index(queue);
1257
1258         if (dev->num_tc) {
1259                 /* Do not allow XPS on subordinate device directly */
1260                 num_tc = dev->num_tc;
1261                 if (num_tc < 0)
1262                         return -EINVAL;
1263
1264                 /* If queue belongs to subordinate dev use its map */
1265                 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1266
1267                 tc = netdev_txq_to_tc(dev, index);
1268                 if (tc < 0)
1269                         return -EINVAL;
1270         }
1271
1272         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
1273                 return -ENOMEM;
1274
1275         rcu_read_lock();
1276         dev_maps = rcu_dereference(dev->xps_cpus_map);
1277         if (dev_maps) {
1278                 for_each_possible_cpu(cpu) {
1279                         int i, tci = cpu * num_tc + tc;
1280                         struct xps_map *map;
1281
1282                         map = rcu_dereference(dev_maps->attr_map[tci]);
1283                         if (!map)
1284                                 continue;
1285
1286                         for (i = map->len; i--;) {
1287                                 if (map->queues[i] == index) {
1288                                         cpumask_set_cpu(cpu, mask);
1289                                         break;
1290                                 }
1291                         }
1292                 }
1293         }
1294         rcu_read_unlock();
1295
1296         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1297         free_cpumask_var(mask);
1298         return len < PAGE_SIZE ? len : -EINVAL;
1299 }
1300
1301 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1302                               const char *buf, size_t len)
1303 {
1304         struct net_device *dev = queue->dev;
1305         unsigned long index;
1306         cpumask_var_t mask;
1307         int err;
1308
1309         if (!netif_is_multiqueue(dev))
1310                 return -ENOENT;
1311
1312         if (!capable(CAP_NET_ADMIN))
1313                 return -EPERM;
1314
1315         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1316                 return -ENOMEM;
1317
1318         index = get_netdev_queue_index(queue);
1319
1320         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1321         if (err) {
1322                 free_cpumask_var(mask);
1323                 return err;
1324         }
1325
1326         err = netif_set_xps_queue(dev, mask, index);
1327
1328         free_cpumask_var(mask);
1329
1330         return err ? : len;
1331 }
1332
1333 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1334         = __ATTR_RW(xps_cpus);
1335
1336 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1337 {
1338         struct net_device *dev = queue->dev;
1339         struct xps_dev_maps *dev_maps;
1340         unsigned long *mask, index;
1341         int j, len, num_tc = 1, tc = 0;
1342
1343         index = get_netdev_queue_index(queue);
1344
1345         if (dev->num_tc) {
1346                 num_tc = dev->num_tc;
1347                 tc = netdev_txq_to_tc(dev, index);
1348                 if (tc < 0)
1349                         return -EINVAL;
1350         }
1351         mask = kcalloc(BITS_TO_LONGS(dev->num_rx_queues), sizeof(long),
1352                        GFP_KERNEL);
1353         if (!mask)
1354                 return -ENOMEM;
1355
1356         rcu_read_lock();
1357         dev_maps = rcu_dereference(dev->xps_rxqs_map);
1358         if (!dev_maps)
1359                 goto out_no_maps;
1360
1361         for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1362              j < dev->num_rx_queues;) {
1363                 int i, tci = j * num_tc + tc;
1364                 struct xps_map *map;
1365
1366                 map = rcu_dereference(dev_maps->attr_map[tci]);
1367                 if (!map)
1368                         continue;
1369
1370                 for (i = map->len; i--;) {
1371                         if (map->queues[i] == index) {
1372                                 set_bit(j, mask);
1373                                 break;
1374                         }
1375                 }
1376         }
1377 out_no_maps:
1378         rcu_read_unlock();
1379
1380         len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1381         kfree(mask);
1382
1383         return len < PAGE_SIZE ? len : -EINVAL;
1384 }
1385
1386 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1387                               size_t len)
1388 {
1389         struct net_device *dev = queue->dev;
1390         struct net *net = dev_net(dev);
1391         unsigned long *mask, index;
1392         int err;
1393
1394         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1395                 return -EPERM;
1396
1397         mask = kcalloc(BITS_TO_LONGS(dev->num_rx_queues), sizeof(long),
1398                        GFP_KERNEL);
1399         if (!mask)
1400                 return -ENOMEM;
1401
1402         index = get_netdev_queue_index(queue);
1403
1404         err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1405         if (err) {
1406                 kfree(mask);
1407                 return err;
1408         }
1409
1410         cpus_read_lock();
1411         err = __netif_set_xps_queue(dev, mask, index, true);
1412         cpus_read_unlock();
1413
1414         kfree(mask);
1415         return err ? : len;
1416 }
1417
1418 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1419         = __ATTR_RW(xps_rxqs);
1420 #endif /* CONFIG_XPS */
1421
1422 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1423         &queue_trans_timeout.attr,
1424         &queue_traffic_class.attr,
1425 #ifdef CONFIG_XPS
1426         &xps_cpus_attribute.attr,
1427         &xps_rxqs_attribute.attr,
1428         &queue_tx_maxrate.attr,
1429 #endif
1430         NULL
1431 };
1432
1433 static void netdev_queue_release(struct kobject *kobj)
1434 {
1435         struct netdev_queue *queue = to_netdev_queue(kobj);
1436
1437         memset(kobj, 0, sizeof(*kobj));
1438         dev_put(queue->dev);
1439 }
1440
1441 static const void *netdev_queue_namespace(struct kobject *kobj)
1442 {
1443         struct netdev_queue *queue = to_netdev_queue(kobj);
1444         struct device *dev = &queue->dev->dev;
1445         const void *ns = NULL;
1446
1447         if (dev->class && dev->class->ns_type)
1448                 ns = dev->class->namespace(dev);
1449
1450         return ns;
1451 }
1452
1453 static void netdev_queue_get_ownership(struct kobject *kobj,
1454                                        kuid_t *uid, kgid_t *gid)
1455 {
1456         const struct net *net = netdev_queue_namespace(kobj);
1457
1458         net_ns_get_ownership(net, uid, gid);
1459 }
1460
1461 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1462         .sysfs_ops = &netdev_queue_sysfs_ops,
1463         .release = netdev_queue_release,
1464         .default_attrs = netdev_queue_default_attrs,
1465         .namespace = netdev_queue_namespace,
1466         .get_ownership = netdev_queue_get_ownership,
1467 };
1468
1469 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1470 {
1471         struct netdev_queue *queue = dev->_tx + index;
1472         struct kobject *kobj = &queue->kobj;
1473         int error = 0;
1474
1475         /* Kobject_put later will trigger netdev_queue_release call
1476          * which decreases dev refcount: Take that reference here
1477          */
1478         dev_hold(queue->dev);
1479
1480         kobj->kset = dev->queues_kset;
1481         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1482                                      "tx-%u", index);
1483         if (error)
1484                 goto err;
1485
1486 #ifdef CONFIG_BQL
1487         error = sysfs_create_group(kobj, &dql_group);
1488         if (error)
1489                 goto err;
1490 #endif
1491
1492         kobject_uevent(kobj, KOBJ_ADD);
1493         return 0;
1494
1495 err:
1496         kobject_put(kobj);
1497         return error;
1498 }
1499 #endif /* CONFIG_SYSFS */
1500
1501 int
1502 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1503 {
1504 #ifdef CONFIG_SYSFS
1505         int i;
1506         int error = 0;
1507
1508         for (i = old_num; i < new_num; i++) {
1509                 error = netdev_queue_add_kobject(dev, i);
1510                 if (error) {
1511                         new_num = old_num;
1512                         break;
1513                 }
1514         }
1515
1516         while (--i >= new_num) {
1517                 struct netdev_queue *queue = dev->_tx + i;
1518
1519                 if (!refcount_read(&dev_net(dev)->count))
1520                         queue->kobj.uevent_suppress = 1;
1521 #ifdef CONFIG_BQL
1522                 sysfs_remove_group(&queue->kobj, &dql_group);
1523 #endif
1524                 kobject_put(&queue->kobj);
1525         }
1526
1527         return error;
1528 #else
1529         return 0;
1530 #endif /* CONFIG_SYSFS */
1531 }
1532
1533 static int register_queue_kobjects(struct net_device *dev)
1534 {
1535         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1536
1537 #ifdef CONFIG_SYSFS
1538         dev->queues_kset = kset_create_and_add("queues",
1539                                                NULL, &dev->dev.kobj);
1540         if (!dev->queues_kset)
1541                 return -ENOMEM;
1542         real_rx = dev->real_num_rx_queues;
1543 #endif
1544         real_tx = dev->real_num_tx_queues;
1545
1546         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1547         if (error)
1548                 goto error;
1549         rxq = real_rx;
1550
1551         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1552         if (error)
1553                 goto error;
1554         txq = real_tx;
1555
1556         return 0;
1557
1558 error:
1559         netdev_queue_update_kobjects(dev, txq, 0);
1560         net_rx_queue_update_kobjects(dev, rxq, 0);
1561 #ifdef CONFIG_SYSFS
1562         kset_unregister(dev->queues_kset);
1563 #endif
1564         return error;
1565 }
1566
1567 static void remove_queue_kobjects(struct net_device *dev)
1568 {
1569         int real_rx = 0, real_tx = 0;
1570
1571 #ifdef CONFIG_SYSFS
1572         real_rx = dev->real_num_rx_queues;
1573 #endif
1574         real_tx = dev->real_num_tx_queues;
1575
1576         net_rx_queue_update_kobjects(dev, real_rx, 0);
1577         netdev_queue_update_kobjects(dev, real_tx, 0);
1578 #ifdef CONFIG_SYSFS
1579         kset_unregister(dev->queues_kset);
1580 #endif
1581 }
1582
1583 static bool net_current_may_mount(void)
1584 {
1585         struct net *net = current->nsproxy->net_ns;
1586
1587         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1588 }
1589
1590 static void *net_grab_current_ns(void)
1591 {
1592         struct net *ns = current->nsproxy->net_ns;
1593 #ifdef CONFIG_NET_NS
1594         if (ns)
1595                 refcount_inc(&ns->passive);
1596 #endif
1597         return ns;
1598 }
1599
1600 static const void *net_initial_ns(void)
1601 {
1602         return &init_net;
1603 }
1604
1605 static const void *net_netlink_ns(struct sock *sk)
1606 {
1607         return sock_net(sk);
1608 }
1609
1610 const struct kobj_ns_type_operations net_ns_type_operations = {
1611         .type = KOBJ_NS_TYPE_NET,
1612         .current_may_mount = net_current_may_mount,
1613         .grab_current_ns = net_grab_current_ns,
1614         .netlink_ns = net_netlink_ns,
1615         .initial_ns = net_initial_ns,
1616         .drop_ns = net_drop_ns,
1617 };
1618 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1619
1620 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1621 {
1622         struct net_device *dev = to_net_dev(d);
1623         int retval;
1624
1625         /* pass interface to uevent. */
1626         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1627         if (retval)
1628                 goto exit;
1629
1630         /* pass ifindex to uevent.
1631          * ifindex is useful as it won't change (interface name may change)
1632          * and is what RtNetlink uses natively.
1633          */
1634         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1635
1636 exit:
1637         return retval;
1638 }
1639
1640 /*
1641  *      netdev_release -- destroy and free a dead device.
1642  *      Called when last reference to device kobject is gone.
1643  */
1644 static void netdev_release(struct device *d)
1645 {
1646         struct net_device *dev = to_net_dev(d);
1647
1648         BUG_ON(dev->reg_state != NETREG_RELEASED);
1649
1650         /* no need to wait for rcu grace period:
1651          * device is dead and about to be freed.
1652          */
1653         kfree(rcu_access_pointer(dev->ifalias));
1654         netdev_freemem(dev);
1655 }
1656
1657 static const void *net_namespace(struct device *d)
1658 {
1659         struct net_device *dev = to_net_dev(d);
1660
1661         return dev_net(dev);
1662 }
1663
1664 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1665 {
1666         struct net_device *dev = to_net_dev(d);
1667         const struct net *net = dev_net(dev);
1668
1669         net_ns_get_ownership(net, uid, gid);
1670 }
1671
1672 static struct class net_class __ro_after_init = {
1673         .name = "net",
1674         .dev_release = netdev_release,
1675         .dev_groups = net_class_groups,
1676         .dev_uevent = netdev_uevent,
1677         .ns_type = &net_ns_type_operations,
1678         .namespace = net_namespace,
1679         .get_ownership = net_get_ownership,
1680 };
1681
1682 #ifdef CONFIG_OF_NET
1683 static int of_dev_node_match(struct device *dev, const void *data)
1684 {
1685         int ret = 0;
1686
1687         if (dev->parent)
1688                 ret = dev->parent->of_node == data;
1689
1690         return ret == 0 ? dev->of_node == data : ret;
1691 }
1692
1693 /*
1694  * of_find_net_device_by_node - lookup the net device for the device node
1695  * @np: OF device node
1696  *
1697  * Looks up the net_device structure corresponding with the device node.
1698  * If successful, returns a pointer to the net_device with the embedded
1699  * struct device refcount incremented by one, or NULL on failure. The
1700  * refcount must be dropped when done with the net_device.
1701  */
1702 struct net_device *of_find_net_device_by_node(struct device_node *np)
1703 {
1704         struct device *dev;
1705
1706         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1707         if (!dev)
1708                 return NULL;
1709
1710         return to_net_dev(dev);
1711 }
1712 EXPORT_SYMBOL(of_find_net_device_by_node);
1713 #endif
1714
1715 /* Delete sysfs entries but hold kobject reference until after all
1716  * netdev references are gone.
1717  */
1718 void netdev_unregister_kobject(struct net_device *ndev)
1719 {
1720         struct device *dev = &ndev->dev;
1721
1722         if (!refcount_read(&dev_net(ndev)->count))
1723                 dev_set_uevent_suppress(dev, 1);
1724
1725         kobject_get(&dev->kobj);
1726
1727         remove_queue_kobjects(ndev);
1728
1729         pm_runtime_set_memalloc_noio(dev, false);
1730
1731         device_del(dev);
1732 }
1733
1734 /* Create sysfs entries for network device. */
1735 int netdev_register_kobject(struct net_device *ndev)
1736 {
1737         struct device *dev = &ndev->dev;
1738         const struct attribute_group **groups = ndev->sysfs_groups;
1739         int error = 0;
1740
1741         device_initialize(dev);
1742         dev->class = &net_class;
1743         dev->platform_data = ndev;
1744         dev->groups = groups;
1745
1746         dev_set_name(dev, "%s", ndev->name);
1747
1748 #ifdef CONFIG_SYSFS
1749         /* Allow for a device specific group */
1750         if (*groups)
1751                 groups++;
1752
1753         *groups++ = &netstat_group;
1754
1755 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1756         if (ndev->ieee80211_ptr)
1757                 *groups++ = &wireless_group;
1758 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1759         else if (ndev->wireless_handlers)
1760                 *groups++ = &wireless_group;
1761 #endif
1762 #endif
1763 #endif /* CONFIG_SYSFS */
1764
1765         error = device_add(dev);
1766         if (error)
1767                 return error;
1768
1769         error = register_queue_kobjects(ndev);
1770         if (error) {
1771                 device_del(dev);
1772                 return error;
1773         }
1774
1775         pm_runtime_set_memalloc_noio(dev, true);
1776
1777         return error;
1778 }
1779
1780 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
1781                                 const void *ns)
1782 {
1783         return class_create_file_ns(&net_class, class_attr, ns);
1784 }
1785 EXPORT_SYMBOL(netdev_class_create_file_ns);
1786
1787 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
1788                                  const void *ns)
1789 {
1790         class_remove_file_ns(&net_class, class_attr, ns);
1791 }
1792 EXPORT_SYMBOL(netdev_class_remove_file_ns);
1793
1794 int __init netdev_kobject_init(void)
1795 {
1796         kobj_ns_type_register(&net_ns_type_operations);
1797         return class_register(&net_class);
1798 }