net/core/net-sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net-sysfs.c - network device class and attributes
   4  *
   5  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
   6  */
   7
   8 #include <linux/capability.h>
   9 #include <linux/kernel.h>
  10 #include <linux/netdevice.h>
  11 #include <linux/if_arp.h>
  12 #include <linux/slab.h>
  13 #include <linux/sched/signal.h>
  14 #include <linux/sched/isolation.h>
  15 #include <linux/nsproxy.h>
  16 #include <net/sock.h>
  17 #include <net/net_namespace.h>
  18 #include <linux/rtnetlink.h>
  19 #include <linux/vmalloc.h>
  20 #include <linux/export.h>
  21 #include <linux/jiffies.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/of.h>
  24 #include <linux/of_net.h>
  25 #include <linux/cpu.h>
  26
  27 #include "net-sysfs.h"
  28
  29 #ifdef CONFIG_SYSFS
  30 static const char fmt_hex[] = "%#x\n";
  31 static const char fmt_dec[] = "%d\n";
  32 static const char fmt_ulong[] = "%lu\n";
  33 static const char fmt_u64[] = "%llu\n";
  34
  35 static inline int dev_isalive(const struct net_device *dev)
  36 {
  37         return dev->reg_state <= NETREG_REGISTERED;
  38 }
  39
  40 /* use same locking rules as GIF* ioctl's */
  41 static ssize_t netdev_show(const struct device *dev,
  42                            struct device_attribute *attr, char *buf,
  43                            ssize_t (*format)(const struct net_device *, char *))
  44 {
  45         struct net_device *ndev = to_net_dev(dev);
  46         ssize_t ret = -EINVAL;
  47
  48         read_lock(&dev_base_lock);
  49         if (dev_isalive(ndev))
  50                 ret = (*format)(ndev, buf);
  51         read_unlock(&dev_base_lock);
  52
  53         return ret;
  54 }
  55
  56 /* generate a show function for simple field */
  57 #define NETDEVICE_SHOW(field, format_string)                            \
  58 static ssize_t format_##field(const struct net_device *dev, char *buf)  \
  59 {                                                                       \
  60         return sprintf(buf, format_string, dev->field);                 \
  61 }                                                                       \
  62 static ssize_t field##_show(struct device *dev,                         \
  63                             struct device_attribute *attr, char *buf)   \
  64 {                                                                       \
  65         return netdev_show(dev, attr, buf, format_##field);             \
  66 }                                                                       \
  67
  68 #define NETDEVICE_SHOW_RO(field, format_string)                         \
  69 NETDEVICE_SHOW(field, format_string);                                   \
  70 static DEVICE_ATTR_RO(field)
  71
  72 #define NETDEVICE_SHOW_RW(field, format_string)                         \
  73 NETDEVICE_SHOW(field, format_string);                                   \
  74 static DEVICE_ATTR_RW(field)
  75
  76 /* use same locking and permission rules as SIF* ioctl's */
  77 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  78                             const char *buf, size_t len,
  79                             int (*set)(struct net_device *, unsigned long))
  80 {
  81         struct net_device *netdev = to_net_dev(dev);
  82         struct net *net = dev_net(netdev);
  83         unsigned long new;
  84         int ret;
  85
  86         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
  87                 return -EPERM;
  88
  89         ret = kstrtoul(buf, 0, &new);
  90         if (ret)
  91                 goto err;
  92
  93         if (!rtnl_trylock())
  94                 return restart_syscall();
  95
  96         if (dev_isalive(netdev)) {
  97                 ret = (*set)(netdev, new);
  98                 if (ret == 0)
  99                         ret = len;
 100         }
 101         rtnl_unlock();
 102  err:
 103         return ret;
 104 }
 105
 106 NETDEVICE_SHOW_RO(dev_id, fmt_hex);
 107 NETDEVICE_SHOW_RO(dev_port, fmt_dec);
 108 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec);
 109 NETDEVICE_SHOW_RO(addr_len, fmt_dec);
 110 NETDEVICE_SHOW_RO(ifindex, fmt_dec);
 111 NETDEVICE_SHOW_RO(type, fmt_dec);
 112 NETDEVICE_SHOW_RO(link_mode, fmt_dec);
 113
 114 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr,
 115                            char *buf)
 116 {
 117         struct net_device *ndev = to_net_dev(dev);
 118
 119         return sprintf(buf, fmt_dec, dev_get_iflink(ndev));
 120 }
 121 static DEVICE_ATTR_RO(iflink);
 122
 123 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf)
 124 {
 125         return sprintf(buf, fmt_dec, dev->name_assign_type);
 126 }
 127
 128 static ssize_t name_assign_type_show(struct device *dev,
 129                                      struct device_attribute *attr,
 130                                      char *buf)
 131 {
 132         struct net_device *ndev = to_net_dev(dev);
 133         ssize_t ret = -EINVAL;
 134
 135         if (ndev->name_assign_type != NET_NAME_UNKNOWN)
 136                 ret = netdev_show(dev, attr, buf, format_name_assign_type);
 137
 138         return ret;
 139 }
 140 static DEVICE_ATTR_RO(name_assign_type);
 141
 142 /* use same locking rules as GIFHWADDR ioctl's */
 143 static ssize_t address_show(struct device *dev, struct device_attribute *attr,
 144                             char *buf)
 145 {
 146         struct net_device *ndev = to_net_dev(dev);
 147         ssize_t ret = -EINVAL;
 148
 149         read_lock(&dev_base_lock);
 150         if (dev_isalive(ndev))
 151                 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len);
 152         read_unlock(&dev_base_lock);
 153         return ret;
 154 }
 155 static DEVICE_ATTR_RO(address);
 156
 157 static ssize_t broadcast_show(struct device *dev,
 158                               struct device_attribute *attr, char *buf)
 159 {
 160         struct net_device *ndev = to_net_dev(dev);
 161
 162         if (dev_isalive(ndev))
 163                 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len);
 164         return -EINVAL;
 165 }
 166 static DEVICE_ATTR_RO(broadcast);
 167
 168 static int change_carrier(struct net_device *dev, unsigned long new_carrier)
 169 {
 170         if (!netif_running(dev))
 171                 return -EINVAL;
 172         return dev_change_carrier(dev, (bool)new_carrier);
 173 }
 174
 175 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr,
 176                              const char *buf, size_t len)
 177 {
 178         return netdev_store(dev, attr, buf, len, change_carrier);
 179 }
 180
 181 static ssize_t carrier_show(struct device *dev,
 182                             struct device_attribute *attr, char *buf)
 183 {
 184         struct net_device *netdev = to_net_dev(dev);
 185
 186         if (netif_running(netdev))
 187                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 188
 189         return -EINVAL;
 190 }
 191 static DEVICE_ATTR_RW(carrier);
 192
 193 static ssize_t speed_show(struct device *dev,
 194                           struct device_attribute *attr, char *buf)
 195 {
 196         struct net_device *netdev = to_net_dev(dev);
 197         int ret = -EINVAL;
 198
 199         if (!rtnl_trylock())
 200                 return restart_syscall();
 201
 202         if (netif_running(netdev)) {
 203                 struct ethtool_link_ksettings cmd;
 204
 205                 if (!__ethtool_get_link_ksettings(netdev, &cmd))
 206                         ret = sprintf(buf, fmt_dec, cmd.base.speed);
 207         }
 208         rtnl_unlock();
 209         return ret;
 210 }
 211 static DEVICE_ATTR_RO(speed);
 212
 213 static ssize_t duplex_show(struct device *dev,
 214                            struct device_attribute *attr, char *buf)
 215 {
 216         struct net_device *netdev = to_net_dev(dev);
 217         int ret = -EINVAL;
 218
 219         if (!rtnl_trylock())
 220                 return restart_syscall();
 221
 222         if (netif_running(netdev)) {
 223                 struct ethtool_link_ksettings cmd;
 224
 225                 if (!__ethtool_get_link_ksettings(netdev, &cmd)) {
 226                         const char *duplex;
 227
 228                         switch (cmd.base.duplex) {
 229                         case DUPLEX_HALF:
 230                                 duplex = "half";
 231                                 break;
 232                         case DUPLEX_FULL:
 233                                 duplex = "full";
 234                                 break;
 235                         default:
 236                                 duplex = "unknown";
 237                                 break;
 238                         }
 239                         ret = sprintf(buf, "%s\n", duplex);
 240                 }
 241         }
 242         rtnl_unlock();
 243         return ret;
 244 }
 245 static DEVICE_ATTR_RO(duplex);
 246
 247 static ssize_t testing_show(struct device *dev,
 248                             struct device_attribute *attr, char *buf)
 249 {
 250         struct net_device *netdev = to_net_dev(dev);
 251
 252         if (netif_running(netdev))
 253                 return sprintf(buf, fmt_dec, !!netif_testing(netdev));
 254
 255         return -EINVAL;
 256 }
 257 static DEVICE_ATTR_RO(testing);
 258
 259 static ssize_t dormant_show(struct device *dev,
 260                             struct device_attribute *attr, char *buf)
 261 {
 262         struct net_device *netdev = to_net_dev(dev);
 263
 264         if (netif_running(netdev))
 265                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 266
 267         return -EINVAL;
 268 }
 269 static DEVICE_ATTR_RO(dormant);
 270
 271 static const char *const operstates[] = {
 272         "unknown",
 273         "notpresent", /* currently unused */
 274         "down",
 275         "lowerlayerdown",
 276         "testing",
 277         "dormant",
 278         "up"
 279 };
 280
 281 static ssize_t operstate_show(struct device *dev,
 282                               struct device_attribute *attr, char *buf)
 283 {
 284         const struct net_device *netdev = to_net_dev(dev);
 285         unsigned char operstate;
 286
 287         read_lock(&dev_base_lock);
 288         operstate = netdev->operstate;
 289         if (!netif_running(netdev))
 290                 operstate = IF_OPER_DOWN;
 291         read_unlock(&dev_base_lock);
 292
 293         if (operstate >= ARRAY_SIZE(operstates))
 294                 return -EINVAL; /* should not happen */
 295
 296         return sprintf(buf, "%s\n", operstates[operstate]);
 297 }
 298 static DEVICE_ATTR_RO(operstate);
 299
 300 static ssize_t carrier_changes_show(struct device *dev,
 301                                     struct device_attribute *attr,
 302                                     char *buf)
 303 {
 304         struct net_device *netdev = to_net_dev(dev);
 305
 306         return sprintf(buf, fmt_dec,
 307                        atomic_read(&netdev->carrier_up_count) +
 308                        atomic_read(&netdev->carrier_down_count));
 309 }
 310 static DEVICE_ATTR_RO(carrier_changes);
 311
 312 static ssize_t carrier_up_count_show(struct device *dev,
 313                                      struct device_attribute *attr,
 314                                      char *buf)
 315 {
 316         struct net_device *netdev = to_net_dev(dev);
 317
 318         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count));
 319 }
 320 static DEVICE_ATTR_RO(carrier_up_count);
 321
 322 static ssize_t carrier_down_count_show(struct device *dev,
 323                                        struct device_attribute *attr,
 324                                        char *buf)
 325 {
 326         struct net_device *netdev = to_net_dev(dev);
 327
 328         return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count));
 329 }
 330 static DEVICE_ATTR_RO(carrier_down_count);
 331
 332 /* read-write attributes */
 333
 334 static int change_mtu(struct net_device *dev, unsigned long new_mtu)
 335 {
 336         return dev_set_mtu(dev, (int)new_mtu);
 337 }
 338
 339 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr,
 340                          const char *buf, size_t len)
 341 {
 342         return netdev_store(dev, attr, buf, len, change_mtu);
 343 }
 344 NETDEVICE_SHOW_RW(mtu, fmt_dec);
 345
 346 static int change_flags(struct net_device *dev, unsigned long new_flags)
 347 {
 348         return dev_change_flags(dev, (unsigned int)new_flags, NULL);
 349 }
 350
 351 static ssize_t flags_store(struct device *dev, struct device_attribute *attr,
 352                            const char *buf, size_t len)
 353 {
 354         return netdev_store(dev, attr, buf, len, change_flags);
 355 }
 356 NETDEVICE_SHOW_RW(flags, fmt_hex);
 357
 358 static ssize_t tx_queue_len_store(struct device *dev,
 359                                   struct device_attribute *attr,
 360                                   const char *buf, size_t len)
 361 {
 362         if (!capable(CAP_NET_ADMIN))
 363                 return -EPERM;
 364
 365         return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len);
 366 }
 367 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
 368
 369 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
 370 {
 371         WRITE_ONCE(dev->gro_flush_timeout, val);
 372         return 0;
 373 }
 374
 375 static ssize_t gro_flush_timeout_store(struct device *dev,
 376                                        struct device_attribute *attr,
 377                                        const char *buf, size_t len)
 378 {
 379         if (!capable(CAP_NET_ADMIN))
 380                 return -EPERM;
 381
 382         return netdev_store(dev, attr, buf, len, change_gro_flush_timeout);
 383 }
 384 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
 385
 386 static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val)
 387 {
 388         WRITE_ONCE(dev->napi_defer_hard_irqs, val);
 389         return 0;
 390 }
 391
 392 static ssize_t napi_defer_hard_irqs_store(struct device *dev,
 393                                           struct device_attribute *attr,
 394                                           const char *buf, size_t len)
 395 {
 396         if (!capable(CAP_NET_ADMIN))
 397                 return -EPERM;
 398
 399         return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs);
 400 }
 401 NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec);
 402
 403 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr,
 404                              const char *buf, size_t len)
 405 {
 406         struct net_device *netdev = to_net_dev(dev);
 407         struct net *net = dev_net(netdev);
 408         size_t count = len;
 409         ssize_t ret = 0;
 410
 411         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 412                 return -EPERM;
 413
 414         /* ignore trailing newline */
 415         if (len >  0 && buf[len - 1] == '\n')
 416                 --count;
 417
 418         if (!rtnl_trylock())
 419                 return restart_syscall();
 420
 421         if (dev_isalive(netdev)) {
 422                 ret = dev_set_alias(netdev, buf, count);
 423                 if (ret < 0)
 424                         goto err;
 425                 ret = len;
 426                 netdev_state_change(netdev);
 427         }
 428 err:
 429         rtnl_unlock();
 430
 431         return ret;
 432 }
 433
 434 static ssize_t ifalias_show(struct device *dev,
 435                             struct device_attribute *attr, char *buf)
 436 {
 437         const struct net_device *netdev = to_net_dev(dev);
 438         char tmp[IFALIASZ];
 439         ssize_t ret = 0;
 440
 441         ret = dev_get_alias(netdev, tmp, sizeof(tmp));
 442         if (ret > 0)
 443                 ret = sprintf(buf, "%s\n", tmp);
 444         return ret;
 445 }
 446 static DEVICE_ATTR_RW(ifalias);
 447
 448 static int change_group(struct net_device *dev, unsigned long new_group)
 449 {
 450         dev_set_group(dev, (int)new_group);
 451         return 0;
 452 }
 453
 454 static ssize_t group_store(struct device *dev, struct device_attribute *attr,
 455                            const char *buf, size_t len)
 456 {
 457         return netdev_store(dev, attr, buf, len, change_group);
 458 }
 459 NETDEVICE_SHOW(group, fmt_dec);
 460 static DEVICE_ATTR(netdev_group, 0644, group_show, group_store);
 461
 462 static int change_proto_down(struct net_device *dev, unsigned long proto_down)
 463 {
 464         return dev_change_proto_down(dev, (bool)proto_down);
 465 }
 466
 467 static ssize_t proto_down_store(struct device *dev,
 468                                 struct device_attribute *attr,
 469                                 const char *buf, size_t len)
 470 {
 471         return netdev_store(dev, attr, buf, len, change_proto_down);
 472 }
 473 NETDEVICE_SHOW_RW(proto_down, fmt_dec);
 474
 475 static ssize_t phys_port_id_show(struct device *dev,
 476                                  struct device_attribute *attr, char *buf)
 477 {
 478         struct net_device *netdev = to_net_dev(dev);
 479         ssize_t ret = -EINVAL;
 480
 481         if (!rtnl_trylock())
 482                 return restart_syscall();
 483
 484         if (dev_isalive(netdev)) {
 485                 struct netdev_phys_item_id ppid;
 486
 487                 ret = dev_get_phys_port_id(netdev, &ppid);
 488                 if (!ret)
 489                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 490         }
 491         rtnl_unlock();
 492
 493         return ret;
 494 }
 495 static DEVICE_ATTR_RO(phys_port_id);
 496
 497 static ssize_t phys_port_name_show(struct device *dev,
 498                                    struct device_attribute *attr, char *buf)
 499 {
 500         struct net_device *netdev = to_net_dev(dev);
 501         ssize_t ret = -EINVAL;
 502
 503         if (!rtnl_trylock())
 504                 return restart_syscall();
 505
 506         if (dev_isalive(netdev)) {
 507                 char name[IFNAMSIZ];
 508
 509                 ret = dev_get_phys_port_name(netdev, name, sizeof(name));
 510                 if (!ret)
 511                         ret = sprintf(buf, "%s\n", name);
 512         }
 513         rtnl_unlock();
 514
 515         return ret;
 516 }
 517 static DEVICE_ATTR_RO(phys_port_name);
 518
 519 static ssize_t phys_switch_id_show(struct device *dev,
 520                                    struct device_attribute *attr, char *buf)
 521 {
 522         struct net_device *netdev = to_net_dev(dev);
 523         ssize_t ret = -EINVAL;
 524
 525         if (!rtnl_trylock())
 526                 return restart_syscall();
 527
 528         if (dev_isalive(netdev)) {
 529                 struct netdev_phys_item_id ppid = { };
 530
 531                 ret = dev_get_port_parent_id(netdev, &ppid, false);
 532                 if (!ret)
 533                         ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
 534         }
 535         rtnl_unlock();
 536
 537         return ret;
 538 }
 539 static DEVICE_ATTR_RO(phys_switch_id);
 540
 541 static ssize_t threaded_show(struct device *dev,
 542                              struct device_attribute *attr, char *buf)
 543 {
 544         struct net_device *netdev = to_net_dev(dev);
 545         ssize_t ret = -EINVAL;
 546
 547         if (!rtnl_trylock())
 548                 return restart_syscall();
 549
 550         if (dev_isalive(netdev))
 551                 ret = sprintf(buf, fmt_dec, netdev->threaded);
 552
 553         rtnl_unlock();
 554         return ret;
 555 }
 556
 557 static int modify_napi_threaded(struct net_device *dev, unsigned long val)
 558 {
 559         int ret;
 560
 561         if (list_empty(&dev->napi_list))
 562                 return -EOPNOTSUPP;
 563
 564         if (val != 0 && val != 1)
 565                 return -EOPNOTSUPP;
 566
 567         ret = dev_set_threaded(dev, val);
 568
 569         return ret;
 570 }
 571
 572 static ssize_t threaded_store(struct device *dev,
 573                               struct device_attribute *attr,
 574                               const char *buf, size_t len)
 575 {
 576         return netdev_store(dev, attr, buf, len, modify_napi_threaded);
 577 }
 578 static DEVICE_ATTR_RW(threaded);
 579
 580 static struct attribute *net_class_attrs[] __ro_after_init = {
 581         &dev_attr_netdev_group.attr,
 582         &dev_attr_type.attr,
 583         &dev_attr_dev_id.attr,
 584         &dev_attr_dev_port.attr,
 585         &dev_attr_iflink.attr,
 586         &dev_attr_ifindex.attr,
 587         &dev_attr_name_assign_type.attr,
 588         &dev_attr_addr_assign_type.attr,
 589         &dev_attr_addr_len.attr,
 590         &dev_attr_link_mode.attr,
 591         &dev_attr_address.attr,
 592         &dev_attr_broadcast.attr,
 593         &dev_attr_speed.attr,
 594         &dev_attr_duplex.attr,
 595         &dev_attr_dormant.attr,
 596         &dev_attr_testing.attr,
 597         &dev_attr_operstate.attr,
 598         &dev_attr_carrier_changes.attr,
 599         &dev_attr_ifalias.attr,
 600         &dev_attr_carrier.attr,
 601         &dev_attr_mtu.attr,
 602         &dev_attr_flags.attr,
 603         &dev_attr_tx_queue_len.attr,
 604         &dev_attr_gro_flush_timeout.attr,
 605         &dev_attr_napi_defer_hard_irqs.attr,
 606         &dev_attr_phys_port_id.attr,
 607         &dev_attr_phys_port_name.attr,
 608         &dev_attr_phys_switch_id.attr,
 609         &dev_attr_proto_down.attr,
 610         &dev_attr_carrier_up_count.attr,
 611         &dev_attr_carrier_down_count.attr,
 612         &dev_attr_threaded.attr,
 613         NULL,
 614 };
 615 ATTRIBUTE_GROUPS(net_class);
 616
 617 /* Show a given an attribute in the statistics group */
 618 static ssize_t netstat_show(const struct device *d,
 619                             struct device_attribute *attr, char *buf,
 620                             unsigned long offset)
 621 {
 622         struct net_device *dev = to_net_dev(d);
 623         ssize_t ret = -EINVAL;
 624
 625         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 626                 offset % sizeof(u64) != 0);
 627
 628         read_lock(&dev_base_lock);
 629         if (dev_isalive(dev)) {
 630                 struct rtnl_link_stats64 temp;
 631                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 632
 633                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset));
 634         }
 635         read_unlock(&dev_base_lock);
 636         return ret;
 637 }
 638
 639 /* generate a read-only statistics attribute */
 640 #define NETSTAT_ENTRY(name)                                             \
 641 static ssize_t name##_show(struct device *d,                            \
 642                            struct device_attribute *attr, char *buf)    \
 643 {                                                                       \
 644         return netstat_show(d, attr, buf,                               \
 645                             offsetof(struct rtnl_link_stats64, name));  \
 646 }                                                                       \
 647 static DEVICE_ATTR_RO(name)
 648
 649 NETSTAT_ENTRY(rx_packets);
 650 NETSTAT_ENTRY(tx_packets);
 651 NETSTAT_ENTRY(rx_bytes);
 652 NETSTAT_ENTRY(tx_bytes);
 653 NETSTAT_ENTRY(rx_errors);
 654 NETSTAT_ENTRY(tx_errors);
 655 NETSTAT_ENTRY(rx_dropped);
 656 NETSTAT_ENTRY(tx_dropped);
 657 NETSTAT_ENTRY(multicast);
 658 NETSTAT_ENTRY(collisions);
 659 NETSTAT_ENTRY(rx_length_errors);
 660 NETSTAT_ENTRY(rx_over_errors);
 661 NETSTAT_ENTRY(rx_crc_errors);
 662 NETSTAT_ENTRY(rx_frame_errors);
 663 NETSTAT_ENTRY(rx_fifo_errors);
 664 NETSTAT_ENTRY(rx_missed_errors);
 665 NETSTAT_ENTRY(tx_aborted_errors);
 666 NETSTAT_ENTRY(tx_carrier_errors);
 667 NETSTAT_ENTRY(tx_fifo_errors);
 668 NETSTAT_ENTRY(tx_heartbeat_errors);
 669 NETSTAT_ENTRY(tx_window_errors);
 670 NETSTAT_ENTRY(rx_compressed);
 671 NETSTAT_ENTRY(tx_compressed);
 672 NETSTAT_ENTRY(rx_nohandler);
 673
 674 static struct attribute *netstat_attrs[] __ro_after_init = {
 675         &dev_attr_rx_packets.attr,
 676         &dev_attr_tx_packets.attr,
 677         &dev_attr_rx_bytes.attr,
 678         &dev_attr_tx_bytes.attr,
 679         &dev_attr_rx_errors.attr,
 680         &dev_attr_tx_errors.attr,
 681         &dev_attr_rx_dropped.attr,
 682         &dev_attr_tx_dropped.attr,
 683         &dev_attr_multicast.attr,
 684         &dev_attr_collisions.attr,
 685         &dev_attr_rx_length_errors.attr,
 686         &dev_attr_rx_over_errors.attr,
 687         &dev_attr_rx_crc_errors.attr,
 688         &dev_attr_rx_frame_errors.attr,
 689         &dev_attr_rx_fifo_errors.attr,
 690         &dev_attr_rx_missed_errors.attr,
 691         &dev_attr_tx_aborted_errors.attr,
 692         &dev_attr_tx_carrier_errors.attr,
 693         &dev_attr_tx_fifo_errors.attr,
 694         &dev_attr_tx_heartbeat_errors.attr,
 695         &dev_attr_tx_window_errors.attr,
 696         &dev_attr_rx_compressed.attr,
 697         &dev_attr_tx_compressed.attr,
 698         &dev_attr_rx_nohandler.attr,
 699         NULL
 700 };
 701
 702 static const struct attribute_group netstat_group = {
 703         .name  = "statistics",
 704         .attrs  = netstat_attrs,
 705 };
 706
 707 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
 708 static struct attribute *wireless_attrs[] = {
 709         NULL
 710 };
 711
 712 static const struct attribute_group wireless_group = {
 713         .name = "wireless",
 714         .attrs = wireless_attrs,
 715 };
 716 #endif
 717
 718 #else /* CONFIG_SYSFS */
 719 #define net_class_groups        NULL
 720 #endif /* CONFIG_SYSFS */
 721
 722 #ifdef CONFIG_SYSFS
 723 #define to_rx_queue_attr(_attr) \
 724         container_of(_attr, struct rx_queue_attribute, attr)
 725
 726 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 727
 728 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 729                                   char *buf)
 730 {
 731         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 732         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 733
 734         if (!attribute->show)
 735                 return -EIO;
 736
 737         return attribute->show(queue, buf);
 738 }
 739
 740 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 741                                    const char *buf, size_t count)
 742 {
 743         const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 744         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 745
 746         if (!attribute->store)
 747                 return -EIO;
 748
 749         return attribute->store(queue, buf, count);
 750 }
 751
 752 static const struct sysfs_ops rx_queue_sysfs_ops = {
 753         .show = rx_queue_attr_show,
 754         .store = rx_queue_attr_store,
 755 };
 756
 757 #ifdef CONFIG_RPS
 758 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf)
 759 {
 760         struct rps_map *map;
 761         cpumask_var_t mask;
 762         int i, len;
 763
 764         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 765                 return -ENOMEM;
 766
 767         rcu_read_lock();
 768         map = rcu_dereference(queue->rps_map);
 769         if (map)
 770                 for (i = 0; i < map->len; i++)
 771                         cpumask_set_cpu(map->cpus[i], mask);
 772
 773         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
 774         rcu_read_unlock();
 775         free_cpumask_var(mask);
 776
 777         return len < PAGE_SIZE ? len : -EINVAL;
 778 }
 779
 780 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 781                              const char *buf, size_t len)
 782 {
 783         struct rps_map *old_map, *map;
 784         cpumask_var_t mask;
 785         int err, cpu, i, hk_flags;
 786         static DEFINE_MUTEX(rps_map_mutex);
 787
 788         if (!capable(CAP_NET_ADMIN))
 789                 return -EPERM;
 790
 791         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 792                 return -ENOMEM;
 793
 794         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 795         if (err) {
 796                 free_cpumask_var(mask);
 797                 return err;
 798         }
 799
 800         if (!cpumask_empty(mask)) {
 801                 hk_flags = HK_FLAG_DOMAIN | HK_FLAG_WQ;
 802                 cpumask_and(mask, mask, housekeeping_cpumask(hk_flags));
 803                 if (cpumask_empty(mask)) {
 804                         free_cpumask_var(mask);
 805                         return -EINVAL;
 806                 }
 807         }
 808
 809         map = kzalloc(max_t(unsigned int,
 810                             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 811                       GFP_KERNEL);
 812         if (!map) {
 813                 free_cpumask_var(mask);
 814                 return -ENOMEM;
 815         }
 816
 817         i = 0;
 818         for_each_cpu_and(cpu, mask, cpu_online_mask)
 819                 map->cpus[i++] = cpu;
 820
 821         if (i) {
 822                 map->len = i;
 823         } else {
 824                 kfree(map);
 825                 map = NULL;
 826         }
 827
 828         mutex_lock(&rps_map_mutex);
 829         old_map = rcu_dereference_protected(queue->rps_map,
 830                                             mutex_is_locked(&rps_map_mutex));
 831         rcu_assign_pointer(queue->rps_map, map);
 832
 833         if (map)
 834                 static_branch_inc(&rps_needed);
 835         if (old_map)
 836                 static_branch_dec(&rps_needed);
 837
 838         mutex_unlock(&rps_map_mutex);
 839
 840         if (old_map)
 841                 kfree_rcu(old_map, rcu);
 842
 843         free_cpumask_var(mask);
 844         return len;
 845 }
 846
 847 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 848                                            char *buf)
 849 {
 850         struct rps_dev_flow_table *flow_table;
 851         unsigned long val = 0;
 852
 853         rcu_read_lock();
 854         flow_table = rcu_dereference(queue->rps_flow_table);
 855         if (flow_table)
 856                 val = (unsigned long)flow_table->mask + 1;
 857         rcu_read_unlock();
 858
 859         return sprintf(buf, "%lu\n", val);
 860 }
 861
 862 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 863 {
 864         struct rps_dev_flow_table *table = container_of(rcu,
 865             struct rps_dev_flow_table, rcu);
 866         vfree(table);
 867 }
 868
 869 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 870                                             const char *buf, size_t len)
 871 {
 872         unsigned long mask, count;
 873         struct rps_dev_flow_table *table, *old_table;
 874         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 875         int rc;
 876
 877         if (!capable(CAP_NET_ADMIN))
 878                 return -EPERM;
 879
 880         rc = kstrtoul(buf, 0, &count);
 881         if (rc < 0)
 882                 return rc;
 883
 884         if (count) {
 885                 mask = count - 1;
 886                 /* mask = roundup_pow_of_two(count) - 1;
 887                  * without overflows...
 888                  */
 889                 while ((mask | (mask >> 1)) != mask)
 890                         mask |= (mask >> 1);
 891                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 892                  * and on 32bit arches, must check
 893                  * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow.
 894                  */
 895 #if BITS_PER_LONG > 32
 896                 if (mask > (unsigned long)(u32)mask)
 897                         return -EINVAL;
 898 #else
 899                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 900                                 / sizeof(struct rps_dev_flow)) {
 901                         /* Enforce a limit to prevent overflow */
 902                         return -EINVAL;
 903                 }
 904 #endif
 905                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 906                 if (!table)
 907                         return -ENOMEM;
 908
 909                 table->mask = mask;
 910                 for (count = 0; count <= mask; count++)
 911                         table->flows[count].cpu = RPS_NO_CPU;
 912         } else {
 913                 table = NULL;
 914         }
 915
 916         spin_lock(&rps_dev_flow_lock);
 917         old_table = rcu_dereference_protected(queue->rps_flow_table,
 918                                               lockdep_is_held(&rps_dev_flow_lock));
 919         rcu_assign_pointer(queue->rps_flow_table, table);
 920         spin_unlock(&rps_dev_flow_lock);
 921
 922         if (old_table)
 923                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 924
 925         return len;
 926 }
 927
 928 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init
 929         = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map);
 930
 931 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init
 932         = __ATTR(rps_flow_cnt, 0644,
 933                  show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 934 #endif /* CONFIG_RPS */
 935
 936 static struct attribute *rx_queue_default_attrs[] __ro_after_init = {
 937 #ifdef CONFIG_RPS
 938         &rps_cpus_attribute.attr,
 939         &rps_dev_flow_table_cnt_attribute.attr,
 940 #endif
 941         NULL
 942 };
 943 ATTRIBUTE_GROUPS(rx_queue_default);
 944
 945 static void rx_queue_release(struct kobject *kobj)
 946 {
 947         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 948 #ifdef CONFIG_RPS
 949         struct rps_map *map;
 950         struct rps_dev_flow_table *flow_table;
 951
 952         map = rcu_dereference_protected(queue->rps_map, 1);
 953         if (map) {
 954                 RCU_INIT_POINTER(queue->rps_map, NULL);
 955                 kfree_rcu(map, rcu);
 956         }
 957
 958         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 959         if (flow_table) {
 960                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 961                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 962         }
 963 #endif
 964
 965         memset(kobj, 0, sizeof(*kobj));
 966         dev_put(queue->dev);
 967 }
 968
 969 static const void *rx_queue_namespace(struct kobject *kobj)
 970 {
 971         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 972         struct device *dev = &queue->dev->dev;
 973         const void *ns = NULL;
 974
 975         if (dev->class && dev->class->ns_type)
 976                 ns = dev->class->namespace(dev);
 977
 978         return ns;
 979 }
 980
 981 static void rx_queue_get_ownership(struct kobject *kobj,
 982                                    kuid_t *uid, kgid_t *gid)
 983 {
 984         const struct net *net = rx_queue_namespace(kobj);
 985
 986         net_ns_get_ownership(net, uid, gid);
 987 }
 988
 989 static struct kobj_type rx_queue_ktype __ro_after_init = {
 990         .sysfs_ops = &rx_queue_sysfs_ops,
 991         .release = rx_queue_release,
 992         .default_groups = rx_queue_default_groups,
 993         .namespace = rx_queue_namespace,
 994         .get_ownership = rx_queue_get_ownership,
 995 };
 996
 997 static int rx_queue_add_kobject(struct net_device *dev, int index)
 998 {
 999         struct netdev_rx_queue *queue = dev->_rx + index;
1000         struct kobject *kobj = &queue->kobj;
1001         int error = 0;
1002
1003         /* Kobject_put later will trigger rx_queue_release call which
1004          * decreases dev refcount: Take that reference here
1005          */
1006         dev_hold(queue->dev);
1007
1008         kobj->kset = dev->queues_kset;
1009         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
1010                                      "rx-%u", index);
1011         if (error)
1012                 goto err;
1013
1014         if (dev->sysfs_rx_queue_group) {
1015                 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group);
1016                 if (error)
1017                         goto err;
1018         }
1019
1020         kobject_uevent(kobj, KOBJ_ADD);
1021
1022         return error;
1023
1024 err:
1025         kobject_put(kobj);
1026         return error;
1027 }
1028
1029 static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid,
1030                                  kgid_t kgid)
1031 {
1032         struct netdev_rx_queue *queue = dev->_rx + index;
1033         struct kobject *kobj = &queue->kobj;
1034         int error;
1035
1036         error = sysfs_change_owner(kobj, kuid, kgid);
1037         if (error)
1038                 return error;
1039
1040         if (dev->sysfs_rx_queue_group)
1041                 error = sysfs_group_change_owner(
1042                         kobj, dev->sysfs_rx_queue_group, kuid, kgid);
1043
1044         return error;
1045 }
1046 #endif /* CONFIG_SYSFS */
1047
1048 int
1049 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1050 {
1051 #ifdef CONFIG_SYSFS
1052         int i;
1053         int error = 0;
1054
1055 #ifndef CONFIG_RPS
1056         if (!dev->sysfs_rx_queue_group)
1057                 return 0;
1058 #endif
1059         for (i = old_num; i < new_num; i++) {
1060                 error = rx_queue_add_kobject(dev, i);
1061                 if (error) {
1062                         new_num = old_num;
1063                         break;
1064                 }
1065         }
1066
1067         while (--i >= new_num) {
1068                 struct kobject *kobj = &dev->_rx[i].kobj;
1069
1070                 if (!refcount_read(&dev_net(dev)->ns.count))
1071                         kobj->uevent_suppress = 1;
1072                 if (dev->sysfs_rx_queue_group)
1073                         sysfs_remove_group(kobj, dev->sysfs_rx_queue_group);
1074                 kobject_put(kobj);
1075         }
1076
1077         return error;
1078 #else
1079         return 0;
1080 #endif
1081 }
1082
1083 static int net_rx_queue_change_owner(struct net_device *dev, int num,
1084                                      kuid_t kuid, kgid_t kgid)
1085 {
1086 #ifdef CONFIG_SYSFS
1087         int error = 0;
1088         int i;
1089
1090 #ifndef CONFIG_RPS
1091         if (!dev->sysfs_rx_queue_group)
1092                 return 0;
1093 #endif
1094         for (i = 0; i < num; i++) {
1095                 error = rx_queue_change_owner(dev, i, kuid, kgid);
1096                 if (error)
1097                         break;
1098         }
1099
1100         return error;
1101 #else
1102         return 0;
1103 #endif
1104 }
1105
1106 #ifdef CONFIG_SYSFS
1107 /*
1108  * netdev_queue sysfs structures and functions.
1109  */
1110 struct netdev_queue_attribute {
1111         struct attribute attr;
1112         ssize_t (*show)(struct netdev_queue *queue, char *buf);
1113         ssize_t (*store)(struct netdev_queue *queue,
1114                          const char *buf, size_t len);
1115 };
1116 #define to_netdev_queue_attr(_attr) \
1117         container_of(_attr, struct netdev_queue_attribute, attr)
1118
1119 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
1120
1121 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
1122                                       struct attribute *attr, char *buf)
1123 {
1124         const struct netdev_queue_attribute *attribute
1125                 = to_netdev_queue_attr(attr);
1126         struct netdev_queue *queue = to_netdev_queue(kobj);
1127
1128         if (!attribute->show)
1129                 return -EIO;
1130
1131         return attribute->show(queue, buf);
1132 }
1133
1134 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
1135                                        struct attribute *attr,
1136                                        const char *buf, size_t count)
1137 {
1138         const struct netdev_queue_attribute *attribute
1139                 = to_netdev_queue_attr(attr);
1140         struct netdev_queue *queue = to_netdev_queue(kobj);
1141
1142         if (!attribute->store)
1143                 return -EIO;
1144
1145         return attribute->store(queue, buf, count);
1146 }
1147
1148 static const struct sysfs_ops netdev_queue_sysfs_ops = {
1149         .show = netdev_queue_attr_show,
1150         .store = netdev_queue_attr_store,
1151 };
1152
1153 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf)
1154 {
1155         unsigned long trans_timeout;
1156
1157         spin_lock_irq(&queue->_xmit_lock);
1158         trans_timeout = queue->trans_timeout;
1159         spin_unlock_irq(&queue->_xmit_lock);
1160
1161         return sprintf(buf, fmt_ulong, trans_timeout);
1162 }
1163
1164 static unsigned int get_netdev_queue_index(struct netdev_queue *queue)
1165 {
1166         struct net_device *dev = queue->dev;
1167         unsigned int i;
1168
1169         i = queue - dev->_tx;
1170         BUG_ON(i >= dev->num_tx_queues);
1171
1172         return i;
1173 }
1174
1175 static ssize_t traffic_class_show(struct netdev_queue *queue,
1176                                   char *buf)
1177 {
1178         struct net_device *dev = queue->dev;
1179         int num_tc, tc;
1180         int index;
1181
1182         if (!netif_is_multiqueue(dev))
1183                 return -ENOENT;
1184
1185         if (!rtnl_trylock())
1186                 return restart_syscall();
1187
1188         index = get_netdev_queue_index(queue);
1189
1190         /* If queue belongs to subordinate dev use its TC mapping */
1191         dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1192
1193         num_tc = dev->num_tc;
1194         tc = netdev_txq_to_tc(dev, index);
1195
1196         rtnl_unlock();
1197
1198         if (tc < 0)
1199                 return -EINVAL;
1200
1201         /* We can report the traffic class one of two ways:
1202          * Subordinate device traffic classes are reported with the traffic
1203          * class first, and then the subordinate class so for example TC0 on
1204          * subordinate device 2 will be reported as "0-2". If the queue
1205          * belongs to the root device it will be reported with just the
1206          * traffic class, so just "0" for TC 0 for example.
1207          */
1208         return num_tc < 0 ? sprintf(buf, "%d%d\n", tc, num_tc) :
1209                             sprintf(buf, "%d\n", tc);
1210 }
1211
1212 #ifdef CONFIG_XPS
1213 static ssize_t tx_maxrate_show(struct netdev_queue *queue,
1214                                char *buf)
1215 {
1216         return sprintf(buf, "%lu\n", queue->tx_maxrate);
1217 }
1218
1219 static ssize_t tx_maxrate_store(struct netdev_queue *queue,
1220                                 const char *buf, size_t len)
1221 {
1222         struct net_device *dev = queue->dev;
1223         int err, index = get_netdev_queue_index(queue);
1224         u32 rate = 0;
1225
1226         if (!capable(CAP_NET_ADMIN))
1227                 return -EPERM;
1228
1229         err = kstrtou32(buf, 10, &rate);
1230         if (err < 0)
1231                 return err;
1232
1233         if (!rtnl_trylock())
1234                 return restart_syscall();
1235
1236         err = -EOPNOTSUPP;
1237         if (dev->netdev_ops->ndo_set_tx_maxrate)
1238                 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate);
1239
1240         rtnl_unlock();
1241         if (!err) {
1242                 queue->tx_maxrate = rate;
1243                 return len;
1244         }
1245         return err;
1246 }
1247
1248 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init
1249         = __ATTR_RW(tx_maxrate);
1250 #endif
1251
1252 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init
1253         = __ATTR_RO(tx_timeout);
1254
1255 static struct netdev_queue_attribute queue_traffic_class __ro_after_init
1256         = __ATTR_RO(traffic_class);
1257
1258 #ifdef CONFIG_BQL
1259 /*
1260  * Byte queue limits sysfs structures and functions.
1261  */
1262 static ssize_t bql_show(char *buf, unsigned int value)
1263 {
1264         return sprintf(buf, "%u\n", value);
1265 }
1266
1267 static ssize_t bql_set(const char *buf, const size_t count,
1268                        unsigned int *pvalue)
1269 {
1270         unsigned int value;
1271         int err;
1272
1273         if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) {
1274                 value = DQL_MAX_LIMIT;
1275         } else {
1276                 err = kstrtouint(buf, 10, &value);
1277                 if (err < 0)
1278                         return err;
1279                 if (value > DQL_MAX_LIMIT)
1280                         return -EINVAL;
1281         }
1282
1283         *pvalue = value;
1284
1285         return count;
1286 }
1287
1288 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
1289                                   char *buf)
1290 {
1291         struct dql *dql = &queue->dql;
1292
1293         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
1294 }
1295
1296 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
1297                                  const char *buf, size_t len)
1298 {
1299         struct dql *dql = &queue->dql;
1300         unsigned int value;
1301         int err;
1302
1303         err = kstrtouint(buf, 10, &value);
1304         if (err < 0)
1305                 return err;
1306
1307         dql->slack_hold_time = msecs_to_jiffies(value);
1308
1309         return len;
1310 }
1311
1312 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init
1313         = __ATTR(hold_time, 0644,
1314                  bql_show_hold_time, bql_set_hold_time);
1315
1316 static ssize_t bql_show_inflight(struct netdev_queue *queue,
1317                                  char *buf)
1318 {
1319         struct dql *dql = &queue->dql;
1320
1321         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
1322 }
1323
1324 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init =
1325         __ATTR(inflight, 0444, bql_show_inflight, NULL);
1326
1327 #define BQL_ATTR(NAME, FIELD)                                           \
1328 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
1329                                  char *buf)                             \
1330 {                                                                       \
1331         return bql_show(buf, queue->dql.FIELD);                         \
1332 }                                                                       \
1333                                                                         \
1334 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
1335                                 const char *buf, size_t len)            \
1336 {                                                                       \
1337         return bql_set(buf, len, &queue->dql.FIELD);                    \
1338 }                                                                       \
1339                                                                         \
1340 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \
1341         = __ATTR(NAME, 0644,                            \
1342                  bql_show_ ## NAME, bql_set_ ## NAME)
1343
1344 BQL_ATTR(limit, limit);
1345 BQL_ATTR(limit_max, max_limit);
1346 BQL_ATTR(limit_min, min_limit);
1347
1348 static struct attribute *dql_attrs[] __ro_after_init = {
1349         &bql_limit_attribute.attr,
1350         &bql_limit_max_attribute.attr,
1351         &bql_limit_min_attribute.attr,
1352         &bql_hold_time_attribute.attr,
1353         &bql_inflight_attribute.attr,
1354         NULL
1355 };
1356
1357 static const struct attribute_group dql_group = {
1358         .name  = "byte_queue_limits",
1359         .attrs  = dql_attrs,
1360 };
1361 #endif /* CONFIG_BQL */
1362
1363 #ifdef CONFIG_XPS
1364 static ssize_t xps_cpus_show(struct netdev_queue *queue,
1365                              char *buf)
1366 {
1367         int cpu, len, ret, num_tc = 1, tc = 0;
1368         struct net_device *dev = queue->dev;
1369         struct xps_dev_maps *dev_maps;
1370         cpumask_var_t mask;
1371         unsigned long index;
1372
1373         if (!netif_is_multiqueue(dev))
1374                 return -ENOENT;
1375
1376         index = get_netdev_queue_index(queue);
1377
1378         if (!rtnl_trylock())
1379                 return restart_syscall();
1380
1381         if (dev->num_tc) {
1382                 /* Do not allow XPS on subordinate device directly */
1383                 num_tc = dev->num_tc;
1384                 if (num_tc < 0) {
1385                         ret = -EINVAL;
1386                         goto err_rtnl_unlock;
1387                 }
1388
1389                 /* If queue belongs to subordinate dev use its map */
1390                 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev;
1391
1392                 tc = netdev_txq_to_tc(dev, index);
1393                 if (tc < 0) {
1394                         ret = -EINVAL;
1395                         goto err_rtnl_unlock;
1396                 }
1397         }
1398
1399         if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
1400                 ret = -ENOMEM;
1401                 goto err_rtnl_unlock;
1402         }
1403
1404         rcu_read_lock();
1405         dev_maps = rcu_dereference(dev->xps_cpus_map);
1406         if (dev_maps) {
1407                 for_each_possible_cpu(cpu) {
1408                         int i, tci = cpu * num_tc + tc;
1409                         struct xps_map *map;
1410
1411                         map = rcu_dereference(dev_maps->attr_map[tci]);
1412                         if (!map)
1413                                 continue;
1414
1415                         for (i = map->len; i--;) {
1416                                 if (map->queues[i] == index) {
1417                                         cpumask_set_cpu(cpu, mask);
1418                                         break;
1419                                 }
1420                         }
1421                 }
1422         }
1423         rcu_read_unlock();
1424
1425         rtnl_unlock();
1426
1427         len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask));
1428         free_cpumask_var(mask);
1429         return len < PAGE_SIZE ? len : -EINVAL;
1430
1431 err_rtnl_unlock:
1432         rtnl_unlock();
1433         return ret;
1434 }
1435
1436 static ssize_t xps_cpus_store(struct netdev_queue *queue,
1437                               const char *buf, size_t len)
1438 {
1439         struct net_device *dev = queue->dev;
1440         unsigned long index;
1441         cpumask_var_t mask;
1442         int err;
1443
1444         if (!netif_is_multiqueue(dev))
1445                 return -ENOENT;
1446
1447         if (!capable(CAP_NET_ADMIN))
1448                 return -EPERM;
1449
1450         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1451                 return -ENOMEM;
1452
1453         index = get_netdev_queue_index(queue);
1454
1455         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1456         if (err) {
1457                 free_cpumask_var(mask);
1458                 return err;
1459         }
1460
1461         if (!rtnl_trylock()) {
1462                 free_cpumask_var(mask);
1463                 return restart_syscall();
1464         }
1465
1466         err = netif_set_xps_queue(dev, mask, index);
1467         rtnl_unlock();
1468
1469         free_cpumask_var(mask);
1470
1471         return err ? : len;
1472 }
1473
1474 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init
1475         = __ATTR_RW(xps_cpus);
1476
1477 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf)
1478 {
1479         int j, len, ret, num_tc = 1, tc = 0;
1480         struct net_device *dev = queue->dev;
1481         struct xps_dev_maps *dev_maps;
1482         unsigned long *mask, index;
1483
1484         index = get_netdev_queue_index(queue);
1485
1486         if (!rtnl_trylock())
1487                 return restart_syscall();
1488
1489         if (dev->num_tc) {
1490                 num_tc = dev->num_tc;
1491                 tc = netdev_txq_to_tc(dev, index);
1492                 if (tc < 0) {
1493                         ret = -EINVAL;
1494                         goto err_rtnl_unlock;
1495                 }
1496         }
1497         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1498         if (!mask) {
1499                 ret = -ENOMEM;
1500                 goto err_rtnl_unlock;
1501         }
1502
1503         rcu_read_lock();
1504         dev_maps = rcu_dereference(dev->xps_rxqs_map);
1505         if (!dev_maps)
1506                 goto out_no_maps;
1507
1508         for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues),
1509              j < dev->num_rx_queues;) {
1510                 int i, tci = j * num_tc + tc;
1511                 struct xps_map *map;
1512
1513                 map = rcu_dereference(dev_maps->attr_map[tci]);
1514                 if (!map)
1515                         continue;
1516
1517                 for (i = map->len; i--;) {
1518                         if (map->queues[i] == index) {
1519                                 set_bit(j, mask);
1520                                 break;
1521                         }
1522                 }
1523         }
1524 out_no_maps:
1525         rcu_read_unlock();
1526
1527         rtnl_unlock();
1528
1529         len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues);
1530         bitmap_free(mask);
1531
1532         return len < PAGE_SIZE ? len : -EINVAL;
1533
1534 err_rtnl_unlock:
1535         rtnl_unlock();
1536         return ret;
1537 }
1538
1539 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf,
1540                               size_t len)
1541 {
1542         struct net_device *dev = queue->dev;
1543         struct net *net = dev_net(dev);
1544         unsigned long *mask, index;
1545         int err;
1546
1547         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
1548                 return -EPERM;
1549
1550         mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL);
1551         if (!mask)
1552                 return -ENOMEM;
1553
1554         index = get_netdev_queue_index(queue);
1555
1556         err = bitmap_parse(buf, len, mask, dev->num_rx_queues);
1557         if (err) {
1558                 bitmap_free(mask);
1559                 return err;
1560         }
1561
1562         if (!rtnl_trylock()) {
1563                 bitmap_free(mask);
1564                 return restart_syscall();
1565         }
1566
1567         cpus_read_lock();
1568         err = __netif_set_xps_queue(dev, mask, index, true);
1569         cpus_read_unlock();
1570
1571         rtnl_unlock();
1572
1573         bitmap_free(mask);
1574         return err ? : len;
1575 }
1576
1577 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init
1578         = __ATTR_RW(xps_rxqs);
1579 #endif /* CONFIG_XPS */
1580
1581 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = {
1582         &queue_trans_timeout.attr,
1583         &queue_traffic_class.attr,
1584 #ifdef CONFIG_XPS
1585         &xps_cpus_attribute.attr,
1586         &xps_rxqs_attribute.attr,
1587         &queue_tx_maxrate.attr,
1588 #endif
1589         NULL
1590 };
1591 ATTRIBUTE_GROUPS(netdev_queue_default);
1592
1593 static void netdev_queue_release(struct kobject *kobj)
1594 {
1595         struct netdev_queue *queue = to_netdev_queue(kobj);
1596
1597         memset(kobj, 0, sizeof(*kobj));
1598         dev_put(queue->dev);
1599 }
1600
1601 static const void *netdev_queue_namespace(struct kobject *kobj)
1602 {
1603         struct netdev_queue *queue = to_netdev_queue(kobj);
1604         struct device *dev = &queue->dev->dev;
1605         const void *ns = NULL;
1606
1607         if (dev->class && dev->class->ns_type)
1608                 ns = dev->class->namespace(dev);
1609
1610         return ns;
1611 }
1612
1613 static void netdev_queue_get_ownership(struct kobject *kobj,
1614                                        kuid_t *uid, kgid_t *gid)
1615 {
1616         const struct net *net = netdev_queue_namespace(kobj);
1617
1618         net_ns_get_ownership(net, uid, gid);
1619 }
1620
1621 static struct kobj_type netdev_queue_ktype __ro_after_init = {
1622         .sysfs_ops = &netdev_queue_sysfs_ops,
1623         .release = netdev_queue_release,
1624         .default_groups = netdev_queue_default_groups,
1625         .namespace = netdev_queue_namespace,
1626         .get_ownership = netdev_queue_get_ownership,
1627 };
1628
1629 static int netdev_queue_add_kobject(struct net_device *dev, int index)
1630 {
1631         struct netdev_queue *queue = dev->_tx + index;
1632         struct kobject *kobj = &queue->kobj;
1633         int error = 0;
1634
1635         /* Kobject_put later will trigger netdev_queue_release call
1636          * which decreases dev refcount: Take that reference here
1637          */
1638         dev_hold(queue->dev);
1639
1640         kobj->kset = dev->queues_kset;
1641         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1642                                      "tx-%u", index);
1643         if (error)
1644                 goto err;
1645
1646 #ifdef CONFIG_BQL
1647         error = sysfs_create_group(kobj, &dql_group);
1648         if (error)
1649                 goto err;
1650 #endif
1651
1652         kobject_uevent(kobj, KOBJ_ADD);
1653         return 0;
1654
1655 err:
1656         kobject_put(kobj);
1657         return error;
1658 }
1659
1660 static int tx_queue_change_owner(struct net_device *ndev, int index,
1661                                  kuid_t kuid, kgid_t kgid)
1662 {
1663         struct netdev_queue *queue = ndev->_tx + index;
1664         struct kobject *kobj = &queue->kobj;
1665         int error;
1666
1667         error = sysfs_change_owner(kobj, kuid, kgid);
1668         if (error)
1669                 return error;
1670
1671 #ifdef CONFIG_BQL
1672         error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid);
1673 #endif
1674         return error;
1675 }
1676 #endif /* CONFIG_SYSFS */
1677
1678 int
1679 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num)
1680 {
1681 #ifdef CONFIG_SYSFS
1682         int i;
1683         int error = 0;
1684
1685         for (i = old_num; i < new_num; i++) {
1686                 error = netdev_queue_add_kobject(dev, i);
1687                 if (error) {
1688                         new_num = old_num;
1689                         break;
1690                 }
1691         }
1692
1693         while (--i >= new_num) {
1694                 struct netdev_queue *queue = dev->_tx + i;
1695
1696                 if (!refcount_read(&dev_net(dev)->ns.count))
1697                         queue->kobj.uevent_suppress = 1;
1698 #ifdef CONFIG_BQL
1699                 sysfs_remove_group(&queue->kobj, &dql_group);
1700 #endif
1701                 kobject_put(&queue->kobj);
1702         }
1703
1704         return error;
1705 #else
1706         return 0;
1707 #endif /* CONFIG_SYSFS */
1708 }
1709
1710 static int net_tx_queue_change_owner(struct net_device *dev, int num,
1711                                      kuid_t kuid, kgid_t kgid)
1712 {
1713 #ifdef CONFIG_SYSFS
1714         int error = 0;
1715         int i;
1716
1717         for (i = 0; i < num; i++) {
1718                 error = tx_queue_change_owner(dev, i, kuid, kgid);
1719                 if (error)
1720                         break;
1721         }
1722
1723         return error;
1724 #else
1725         return 0;
1726 #endif /* CONFIG_SYSFS */
1727 }
1728
1729 static int register_queue_kobjects(struct net_device *dev)
1730 {
1731         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1732
1733 #ifdef CONFIG_SYSFS
1734         dev->queues_kset = kset_create_and_add("queues",
1735                                                NULL, &dev->dev.kobj);
1736         if (!dev->queues_kset)
1737                 return -ENOMEM;
1738         real_rx = dev->real_num_rx_queues;
1739 #endif
1740         real_tx = dev->real_num_tx_queues;
1741
1742         error = net_rx_queue_update_kobjects(dev, 0, real_rx);
1743         if (error)
1744                 goto error;
1745         rxq = real_rx;
1746
1747         error = netdev_queue_update_kobjects(dev, 0, real_tx);
1748         if (error)
1749                 goto error;
1750         txq = real_tx;
1751
1752         return 0;
1753
1754 error:
1755         netdev_queue_update_kobjects(dev, txq, 0);
1756         net_rx_queue_update_kobjects(dev, rxq, 0);
1757 #ifdef CONFIG_SYSFS
1758         kset_unregister(dev->queues_kset);
1759 #endif
1760         return error;
1761 }
1762
1763 static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid)
1764 {
1765         int error = 0, real_rx = 0, real_tx = 0;
1766
1767 #ifdef CONFIG_SYSFS
1768         if (ndev->queues_kset) {
1769                 error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid);
1770                 if (error)
1771                         return error;
1772         }
1773         real_rx = ndev->real_num_rx_queues;
1774 #endif
1775         real_tx = ndev->real_num_tx_queues;
1776
1777         error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid);
1778         if (error)
1779                 return error;
1780
1781         error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid);
1782         if (error)
1783                 return error;
1784
1785         return 0;
1786 }
1787
1788 static void remove_queue_kobjects(struct net_device *dev)
1789 {
1790         int real_rx = 0, real_tx = 0;
1791
1792 #ifdef CONFIG_SYSFS
1793         real_rx = dev->real_num_rx_queues;
1794 #endif
1795         real_tx = dev->real_num_tx_queues;
1796
1797         net_rx_queue_update_kobjects(dev, real_rx, 0);
1798         netdev_queue_update_kobjects(dev, real_tx, 0);
1799 #ifdef CONFIG_SYSFS
1800         kset_unregister(dev->queues_kset);
1801 #endif
1802 }
1803
1804 static bool net_current_may_mount(void)
1805 {
1806         struct net *net = current->nsproxy->net_ns;
1807
1808         return ns_capable(net->user_ns, CAP_SYS_ADMIN);
1809 }
1810
1811 static void *net_grab_current_ns(void)
1812 {
1813         struct net *ns = current->nsproxy->net_ns;
1814 #ifdef CONFIG_NET_NS
1815         if (ns)
1816                 refcount_inc(&ns->passive);
1817 #endif
1818         return ns;
1819 }
1820
1821 static const void *net_initial_ns(void)
1822 {
1823         return &init_net;
1824 }
1825
1826 static const void *net_netlink_ns(struct sock *sk)
1827 {
1828         return sock_net(sk);
1829 }
1830
1831 const struct kobj_ns_type_operations net_ns_type_operations = {
1832         .type = KOBJ_NS_TYPE_NET,
1833         .current_may_mount = net_current_may_mount,
1834         .grab_current_ns = net_grab_current_ns,
1835         .netlink_ns = net_netlink_ns,
1836         .initial_ns = net_initial_ns,
1837         .drop_ns = net_drop_ns,
1838 };
1839 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1840
1841 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1842 {
1843         struct net_device *dev = to_net_dev(d);
1844         int retval;
1845
1846         /* pass interface to uevent. */
1847         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1848         if (retval)
1849                 goto exit;
1850
1851         /* pass ifindex to uevent.
1852          * ifindex is useful as it won't change (interface name may change)
1853          * and is what RtNetlink uses natively.
1854          */
1855         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1856
1857 exit:
1858         return retval;
1859 }
1860
1861 /*
1862  *      netdev_release -- destroy and free a dead device.
1863  *      Called when last reference to device kobject is gone.
1864  */
1865 static void netdev_release(struct device *d)
1866 {
1867         struct net_device *dev = to_net_dev(d);
1868
1869         BUG_ON(dev->reg_state != NETREG_RELEASED);
1870
1871         /* no need to wait for rcu grace period:
1872          * device is dead and about to be freed.
1873          */
1874         kfree(rcu_access_pointer(dev->ifalias));
1875         netdev_freemem(dev);
1876 }
1877
1878 static const void *net_namespace(struct device *d)
1879 {
1880         struct net_device *dev = to_net_dev(d);
1881
1882         return dev_net(dev);
1883 }
1884
1885 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid)
1886 {
1887         struct net_device *dev = to_net_dev(d);
1888         const struct net *net = dev_net(dev);
1889
1890         net_ns_get_ownership(net, uid, gid);
1891 }
1892
1893 static struct class net_class __ro_after_init = {
1894         .name = "net",
1895         .dev_release = netdev_release,
1896         .dev_groups = net_class_groups,
1897         .dev_uevent = netdev_uevent,
1898         .ns_type = &net_ns_type_operations,
1899         .namespace = net_namespace,
1900         .get_ownership = net_get_ownership,
1901 };
1902
1903 #ifdef CONFIG_OF_NET
1904 static int of_dev_node_match(struct device *dev, const void *data)
1905 {
1906         for (; dev; dev = dev->parent) {
1907                 if (dev->of_node == data)
1908                         return 1;
1909         }
1910
1911         return 0;
1912 }
1913
1914 /*
1915  * of_find_net_device_by_node - lookup the net device for the device node
1916  * @np: OF device node
1917  *
1918  * Looks up the net_device structure corresponding with the device node.
1919  * If successful, returns a pointer to the net_device with the embedded
1920  * struct device refcount incremented by one, or NULL on failure. The
1921  * refcount must be dropped when done with the net_device.
1922  */
1923 struct net_device *of_find_net_device_by_node(struct device_node *np)
1924 {
1925         struct device *dev;
1926
1927         dev = class_find_device(&net_class, NULL, np, of_dev_node_match);
1928         if (!dev)
1929                 return NULL;
1930
1931         return to_net_dev(dev);
1932 }
1933 EXPORT_SYMBOL(of_find_net_device_by_node);
1934 #endif
1935
1936 /* Delete sysfs entries but hold kobject reference until after all
1937  * netdev references are gone.
1938  */
1939 void netdev_unregister_kobject(struct net_device *ndev)
1940 {
1941         struct device *dev = &ndev->dev;
1942
1943         if (!refcount_read(&dev_net(ndev)->ns.count))
1944                 dev_set_uevent_suppress(dev, 1);
1945
1946         kobject_get(&dev->kobj);
1947
1948         remove_queue_kobjects(ndev);
1949
1950         pm_runtime_set_memalloc_noio(dev, false);
1951
1952         device_del(dev);
1953 }
1954
1955 /* Create sysfs entries for network device. */
1956 int netdev_register_kobject(struct net_device *ndev)
1957 {
1958         struct device *dev = &ndev->dev;
1959         const struct attribute_group **groups = ndev->sysfs_groups;
1960         int error = 0;
1961
1962         device_initialize(dev);
1963         dev->class = &net_class;
1964         dev->platform_data = ndev;
1965         dev->groups = groups;
1966
1967         dev_set_name(dev, "%s", ndev->name);
1968
1969 #ifdef CONFIG_SYSFS
1970         /* Allow for a device specific group */
1971         if (*groups)
1972                 groups++;
1973
1974         *groups++ = &netstat_group;
1975
1976 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211)
1977         if (ndev->ieee80211_ptr)
1978                 *groups++ = &wireless_group;
1979 #if IS_ENABLED(CONFIG_WIRELESS_EXT)
1980         else if (ndev->wireless_handlers)
1981                 *groups++ = &wireless_group;
1982 #endif
1983 #endif
1984 #endif /* CONFIG_SYSFS */
1985
1986         error = device_add(dev);
1987         if (error)
1988                 return error;
1989
1990         error = register_queue_kobjects(ndev);
1991         if (error) {
1992                 device_del(dev);
1993                 return error;
1994         }
1995
1996         pm_runtime_set_memalloc_noio(dev, true);
1997
1998         return error;
1999 }
2000
2001 /* Change owner for sysfs entries when moving network devices across network
2002  * namespaces owned by different user namespaces.
2003  */
2004 int netdev_change_owner(struct net_device *ndev, const struct net *net_old,
2005                         const struct net *net_new)
2006 {
2007         struct device *dev = &ndev->dev;
2008         kuid_t old_uid, new_uid;
2009         kgid_t old_gid, new_gid;
2010         int error;
2011
2012         net_ns_get_ownership(net_old, &old_uid, &old_gid);
2013         net_ns_get_ownership(net_new, &new_uid, &new_gid);
2014
2015         /* The network namespace was changed but the owning user namespace is
2016          * identical so there's no need to change the owner of sysfs entries.
2017          */
2018         if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid))
2019                 return 0;
2020
2021         error = device_change_owner(dev, new_uid, new_gid);
2022         if (error)
2023                 return error;
2024
2025         error = queue_change_owner(ndev, new_uid, new_gid);
2026         if (error)
2027                 return error;
2028
2029         return 0;
2030 }
2031
2032 int netdev_class_create_file_ns(const struct class_attribute *class_attr,
2033                                 const void *ns)
2034 {
2035         return class_create_file_ns(&net_class, class_attr, ns);
2036 }
2037 EXPORT_SYMBOL(netdev_class_create_file_ns);
2038
2039 void netdev_class_remove_file_ns(const struct class_attribute *class_attr,
2040                                  const void *ns)
2041 {
2042         class_remove_file_ns(&net_class, class_attr, ns);
2043 }
2044 EXPORT_SYMBOL(netdev_class_remove_file_ns);
2045
2046 int __init netdev_kobject_init(void)
2047 {
2048         kobj_ns_type_register(&net_ns_type_operations);
2049         return class_register(&net_class);
2050 }