net/core/net-sysfs.c

   1 /*
   2  * net-sysfs.c - network device class and attributes
   3  *
   4  * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License
   8  *      as published by the Free Software Foundation; either version
   9  *      2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/capability.h>
  13 #include <linux/kernel.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/slab.h>
  17 #include <linux/nsproxy.h>
  18 #include <net/sock.h>
  19 #include <net/net_namespace.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/wireless.h>
  22 #include <linux/vmalloc.h>
  23 #include <linux/export.h>
  24 #include <linux/jiffies.h>
  25 #include <net/wext.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_long_hex[] = "%#lx\n";
  32 static const char fmt_dec[] = "%d\n";
  33 static const char fmt_udec[] = "%u\n";
  34 static const char fmt_ulong[] = "%lu\n";
  35 static const char fmt_u64[] = "%llu\n";
  36
  37 static inline int dev_isalive(const struct net_device *dev)
  38 {
  39         return dev->reg_state <= NETREG_REGISTERED;
  40 }
  41
  42 /* use same locking rules as GIF* ioctl's */
  43 static ssize_t netdev_show(const struct device *dev,
  44                            struct device_attribute *attr, char *buf,
  45                            ssize_t (*format)(const struct net_device *, char *))
  46 {
  47         struct net_device *net = to_net_dev(dev);
  48         ssize_t ret = -EINVAL;
  49
  50         read_lock(&dev_base_lock);
  51         if (dev_isalive(net))
  52                 ret = (*format)(net, buf);
  53         read_unlock(&dev_base_lock);
  54
  55         return ret;
  56 }
  57
  58 /* generate a show function for simple field */
  59 #define NETDEVICE_SHOW(field, format_string)                            \
  60 static ssize_t format_##field(const struct net_device *net, char *buf)  \
  61 {                                                                       \
  62         return sprintf(buf, format_string, net->field);                 \
  63 }                                                                       \
  64 static ssize_t show_##field(struct device *dev,                         \
  65                             struct device_attribute *attr, char *buf)   \
  66 {                                                                       \
  67         return netdev_show(dev, attr, buf, format_##field);             \
  68 }
  69
  70
  71 /* use same locking and permission rules as SIF* ioctl's */
  72 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  73                             const char *buf, size_t len,
  74                             int (*set)(struct net_device *, unsigned long))
  75 {
  76         struct net_device *net = to_net_dev(dev);
  77         unsigned long new;
  78         int ret = -EINVAL;
  79
  80         if (!capable(CAP_NET_ADMIN))
  81                 return -EPERM;
  82
  83         ret = kstrtoul(buf, 0, &new);
  84         if (ret)
  85                 goto err;
  86
  87         if (!rtnl_trylock())
  88                 return restart_syscall();
  89
  90         if (dev_isalive(net)) {
  91                 if ((ret = (*set)(net, new)) == 0)
  92                         ret = len;
  93         }
  94         rtnl_unlock();
  95  err:
  96         return ret;
  97 }
  98
  99 NETDEVICE_SHOW(dev_id, fmt_hex);
 100 NETDEVICE_SHOW(addr_assign_type, fmt_dec);
 101 NETDEVICE_SHOW(addr_len, fmt_dec);
 102 NETDEVICE_SHOW(iflink, fmt_dec);
 103 NETDEVICE_SHOW(ifindex, fmt_dec);
 104 NETDEVICE_SHOW(type, fmt_dec);
 105 NETDEVICE_SHOW(link_mode, fmt_dec);
 106
 107 /* use same locking rules as GIFHWADDR ioctl's */
 108 static ssize_t show_address(struct device *dev, struct device_attribute *attr,
 109                             char *buf)
 110 {
 111         struct net_device *net = to_net_dev(dev);
 112         ssize_t ret = -EINVAL;
 113
 114         read_lock(&dev_base_lock);
 115         if (dev_isalive(net))
 116                 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
 117         read_unlock(&dev_base_lock);
 118         return ret;
 119 }
 120
 121 static ssize_t show_broadcast(struct device *dev,
 122                             struct device_attribute *attr, char *buf)
 123 {
 124         struct net_device *net = to_net_dev(dev);
 125         if (dev_isalive(net))
 126                 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
 127         return -EINVAL;
 128 }
 129
 130 static ssize_t show_carrier(struct device *dev,
 131                             struct device_attribute *attr, char *buf)
 132 {
 133         struct net_device *netdev = to_net_dev(dev);
 134         if (netif_running(netdev)) {
 135                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 136         }
 137         return -EINVAL;
 138 }
 139
 140 static ssize_t show_speed(struct device *dev,
 141                           struct device_attribute *attr, char *buf)
 142 {
 143         struct net_device *netdev = to_net_dev(dev);
 144         int ret = -EINVAL;
 145
 146         if (!rtnl_trylock())
 147                 return restart_syscall();
 148
 149         if (netif_running(netdev)) {
 150                 struct ethtool_cmd cmd;
 151                 if (!__ethtool_get_settings(netdev, &cmd))
 152                         ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
 153         }
 154         rtnl_unlock();
 155         return ret;
 156 }
 157
 158 static ssize_t show_duplex(struct device *dev,
 159                            struct device_attribute *attr, char *buf)
 160 {
 161         struct net_device *netdev = to_net_dev(dev);
 162         int ret = -EINVAL;
 163
 164         if (!rtnl_trylock())
 165                 return restart_syscall();
 166
 167         if (netif_running(netdev)) {
 168                 struct ethtool_cmd cmd;
 169                 if (!__ethtool_get_settings(netdev, &cmd))
 170                         ret = sprintf(buf, "%s\n",
 171                                       cmd.duplex ? "full" : "half");
 172         }
 173         rtnl_unlock();
 174         return ret;
 175 }
 176
 177 static ssize_t show_dormant(struct device *dev,
 178                             struct device_attribute *attr, char *buf)
 179 {
 180         struct net_device *netdev = to_net_dev(dev);
 181
 182         if (netif_running(netdev))
 183                 return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
 184
 185         return -EINVAL;
 186 }
 187
 188 static const char *const operstates[] = {
 189         "unknown",
 190         "notpresent", /* currently unused */
 191         "down",
 192         "lowerlayerdown",
 193         "testing", /* currently unused */
 194         "dormant",
 195         "up"
 196 };
 197
 198 static ssize_t show_operstate(struct device *dev,
 199                               struct device_attribute *attr, char *buf)
 200 {
 201         const struct net_device *netdev = to_net_dev(dev);
 202         unsigned char operstate;
 203
 204         read_lock(&dev_base_lock);
 205         operstate = netdev->operstate;
 206         if (!netif_running(netdev))
 207                 operstate = IF_OPER_DOWN;
 208         read_unlock(&dev_base_lock);
 209
 210         if (operstate >= ARRAY_SIZE(operstates))
 211                 return -EINVAL; /* should not happen */
 212
 213         return sprintf(buf, "%s\n", operstates[operstate]);
 214 }
 215
 216 /* read-write attributes */
 217 NETDEVICE_SHOW(mtu, fmt_dec);
 218
 219 static int change_mtu(struct net_device *net, unsigned long new_mtu)
 220 {
 221         return dev_set_mtu(net, (int) new_mtu);
 222 }
 223
 224 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
 225                          const char *buf, size_t len)
 226 {
 227         return netdev_store(dev, attr, buf, len, change_mtu);
 228 }
 229
 230 NETDEVICE_SHOW(flags, fmt_hex);
 231
 232 static int change_flags(struct net_device *net, unsigned long new_flags)
 233 {
 234         return dev_change_flags(net, (unsigned int) new_flags);
 235 }
 236
 237 static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
 238                            const char *buf, size_t len)
 239 {
 240         return netdev_store(dev, attr, buf, len, change_flags);
 241 }
 242
 243 NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
 244
 245 static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
 246 {
 247         net->tx_queue_len = new_len;
 248         return 0;
 249 }
 250
 251 static ssize_t store_tx_queue_len(struct device *dev,
 252                                   struct device_attribute *attr,
 253                                   const char *buf, size_t len)
 254 {
 255         return netdev_store(dev, attr, buf, len, change_tx_queue_len);
 256 }
 257
 258 static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
 259                              const char *buf, size_t len)
 260 {
 261         struct net_device *netdev = to_net_dev(dev);
 262         size_t count = len;
 263         ssize_t ret;
 264
 265         if (!capable(CAP_NET_ADMIN))
 266                 return -EPERM;
 267
 268         /* ignore trailing newline */
 269         if (len >  0 && buf[len - 1] == '\n')
 270                 --count;
 271
 272         if (!rtnl_trylock())
 273                 return restart_syscall();
 274         ret = dev_set_alias(netdev, buf, count);
 275         rtnl_unlock();
 276
 277         return ret < 0 ? ret : len;
 278 }
 279
 280 static ssize_t show_ifalias(struct device *dev,
 281                             struct device_attribute *attr, char *buf)
 282 {
 283         const struct net_device *netdev = to_net_dev(dev);
 284         ssize_t ret = 0;
 285
 286         if (!rtnl_trylock())
 287                 return restart_syscall();
 288         if (netdev->ifalias)
 289                 ret = sprintf(buf, "%s\n", netdev->ifalias);
 290         rtnl_unlock();
 291         return ret;
 292 }
 293
 294 NETDEVICE_SHOW(group, fmt_dec);
 295
 296 static int change_group(struct net_device *net, unsigned long new_group)
 297 {
 298         dev_set_group(net, (int) new_group);
 299         return 0;
 300 }
 301
 302 static ssize_t store_group(struct device *dev, struct device_attribute *attr,
 303                          const char *buf, size_t len)
 304 {
 305         return netdev_store(dev, attr, buf, len, change_group);
 306 }
 307
 308 static struct device_attribute net_class_attributes[] = {
 309         __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
 310         __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
 311         __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
 312         __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
 313         __ATTR(iflink, S_IRUGO, show_iflink, NULL),
 314         __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
 315         __ATTR(type, S_IRUGO, show_type, NULL),
 316         __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
 317         __ATTR(address, S_IRUGO, show_address, NULL),
 318         __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
 319         __ATTR(carrier, S_IRUGO, show_carrier, NULL),
 320         __ATTR(speed, S_IRUGO, show_speed, NULL),
 321         __ATTR(duplex, S_IRUGO, show_duplex, NULL),
 322         __ATTR(dormant, S_IRUGO, show_dormant, NULL),
 323         __ATTR(operstate, S_IRUGO, show_operstate, NULL),
 324         __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
 325         __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
 326         __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
 327                store_tx_queue_len),
 328         __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
 329         {}
 330 };
 331
 332 /* Show a given an attribute in the statistics group */
 333 static ssize_t netstat_show(const struct device *d,
 334                             struct device_attribute *attr, char *buf,
 335                             unsigned long offset)
 336 {
 337         struct net_device *dev = to_net_dev(d);
 338         ssize_t ret = -EINVAL;
 339
 340         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 341                         offset % sizeof(u64) != 0);
 342
 343         read_lock(&dev_base_lock);
 344         if (dev_isalive(dev)) {
 345                 struct rtnl_link_stats64 temp;
 346                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 347
 348                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
 349         }
 350         read_unlock(&dev_base_lock);
 351         return ret;
 352 }
 353
 354 /* generate a read-only statistics attribute */
 355 #define NETSTAT_ENTRY(name)                                             \
 356 static ssize_t show_##name(struct device *d,                            \
 357                            struct device_attribute *attr, char *buf)    \
 358 {                                                                       \
 359         return netstat_show(d, attr, buf,                               \
 360                             offsetof(struct rtnl_link_stats64, name));  \
 361 }                                                                       \
 362 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
 363
 364 NETSTAT_ENTRY(rx_packets);
 365 NETSTAT_ENTRY(tx_packets);
 366 NETSTAT_ENTRY(rx_bytes);
 367 NETSTAT_ENTRY(tx_bytes);
 368 NETSTAT_ENTRY(rx_errors);
 369 NETSTAT_ENTRY(tx_errors);
 370 NETSTAT_ENTRY(rx_dropped);
 371 NETSTAT_ENTRY(tx_dropped);
 372 NETSTAT_ENTRY(multicast);
 373 NETSTAT_ENTRY(collisions);
 374 NETSTAT_ENTRY(rx_length_errors);
 375 NETSTAT_ENTRY(rx_over_errors);
 376 NETSTAT_ENTRY(rx_crc_errors);
 377 NETSTAT_ENTRY(rx_frame_errors);
 378 NETSTAT_ENTRY(rx_fifo_errors);
 379 NETSTAT_ENTRY(rx_missed_errors);
 380 NETSTAT_ENTRY(tx_aborted_errors);
 381 NETSTAT_ENTRY(tx_carrier_errors);
 382 NETSTAT_ENTRY(tx_fifo_errors);
 383 NETSTAT_ENTRY(tx_heartbeat_errors);
 384 NETSTAT_ENTRY(tx_window_errors);
 385 NETSTAT_ENTRY(rx_compressed);
 386 NETSTAT_ENTRY(tx_compressed);
 387
 388 static struct attribute *netstat_attrs[] = {
 389         &dev_attr_rx_packets.attr,
 390         &dev_attr_tx_packets.attr,
 391         &dev_attr_rx_bytes.attr,
 392         &dev_attr_tx_bytes.attr,
 393         &dev_attr_rx_errors.attr,
 394         &dev_attr_tx_errors.attr,
 395         &dev_attr_rx_dropped.attr,
 396         &dev_attr_tx_dropped.attr,
 397         &dev_attr_multicast.attr,
 398         &dev_attr_collisions.attr,
 399         &dev_attr_rx_length_errors.attr,
 400         &dev_attr_rx_over_errors.attr,
 401         &dev_attr_rx_crc_errors.attr,
 402         &dev_attr_rx_frame_errors.attr,
 403         &dev_attr_rx_fifo_errors.attr,
 404         &dev_attr_rx_missed_errors.attr,
 405         &dev_attr_tx_aborted_errors.attr,
 406         &dev_attr_tx_carrier_errors.attr,
 407         &dev_attr_tx_fifo_errors.attr,
 408         &dev_attr_tx_heartbeat_errors.attr,
 409         &dev_attr_tx_window_errors.attr,
 410         &dev_attr_rx_compressed.attr,
 411         &dev_attr_tx_compressed.attr,
 412         NULL
 413 };
 414
 415
 416 static struct attribute_group netstat_group = {
 417         .name  = "statistics",
 418         .attrs  = netstat_attrs,
 419 };
 420
 421 #ifdef CONFIG_WIRELESS_EXT_SYSFS
 422 /* helper function that does all the locking etc for wireless stats */
 423 static ssize_t wireless_show(struct device *d, char *buf,
 424                              ssize_t (*format)(const struct iw_statistics *,
 425                                                char *))
 426 {
 427         struct net_device *dev = to_net_dev(d);
 428         const struct iw_statistics *iw;
 429         ssize_t ret = -EINVAL;
 430
 431         if (!rtnl_trylock())
 432                 return restart_syscall();
 433         if (dev_isalive(dev)) {
 434                 iw = get_wireless_stats(dev);
 435                 if (iw)
 436                         ret = (*format)(iw, buf);
 437         }
 438         rtnl_unlock();
 439
 440         return ret;
 441 }
 442
 443 /* show function template for wireless fields */
 444 #define WIRELESS_SHOW(name, field, format_string)                       \
 445 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
 446 {                                                                       \
 447         return sprintf(buf, format_string, iw->field);                  \
 448 }                                                                       \
 449 static ssize_t show_iw_##name(struct device *d,                         \
 450                               struct device_attribute *attr, char *buf) \
 451 {                                                                       \
 452         return wireless_show(d, buf, format_iw_##name);                 \
 453 }                                                                       \
 454 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
 455
 456 WIRELESS_SHOW(status, status, fmt_hex);
 457 WIRELESS_SHOW(link, qual.qual, fmt_dec);
 458 WIRELESS_SHOW(level, qual.level, fmt_dec);
 459 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
 460 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
 461 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
 462 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
 463 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
 464 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
 465 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
 466
 467 static struct attribute *wireless_attrs[] = {
 468         &dev_attr_status.attr,
 469         &dev_attr_link.attr,
 470         &dev_attr_level.attr,
 471         &dev_attr_noise.attr,
 472         &dev_attr_nwid.attr,
 473         &dev_attr_crypt.attr,
 474         &dev_attr_fragment.attr,
 475         &dev_attr_retries.attr,
 476         &dev_attr_misc.attr,
 477         &dev_attr_beacon.attr,
 478         NULL
 479 };
 480
 481 static struct attribute_group wireless_group = {
 482         .name = "wireless",
 483         .attrs = wireless_attrs,
 484 };
 485 #endif
 486 #endif /* CONFIG_SYSFS */
 487
 488 #ifdef CONFIG_RPS
 489 /*
 490  * RX queue sysfs structures and functions.
 491  */
 492 struct rx_queue_attribute {
 493         struct attribute attr;
 494         ssize_t (*show)(struct netdev_rx_queue *queue,
 495             struct rx_queue_attribute *attr, char *buf);
 496         ssize_t (*store)(struct netdev_rx_queue *queue,
 497             struct rx_queue_attribute *attr, const char *buf, size_t len);
 498 };
 499 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 500     struct rx_queue_attribute, attr)
 501
 502 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 503
 504 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 505                                   char *buf)
 506 {
 507         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 508         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 509
 510         if (!attribute->show)
 511                 return -EIO;
 512
 513         return attribute->show(queue, attribute, buf);
 514 }
 515
 516 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 517                                    const char *buf, size_t count)
 518 {
 519         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 520         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 521
 522         if (!attribute->store)
 523                 return -EIO;
 524
 525         return attribute->store(queue, attribute, buf, count);
 526 }
 527
 528 static const struct sysfs_ops rx_queue_sysfs_ops = {
 529         .show = rx_queue_attr_show,
 530         .store = rx_queue_attr_store,
 531 };
 532
 533 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 534                             struct rx_queue_attribute *attribute, char *buf)
 535 {
 536         struct rps_map *map;
 537         cpumask_var_t mask;
 538         size_t len = 0;
 539         int i;
 540
 541         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 542                 return -ENOMEM;
 543
 544         rcu_read_lock();
 545         map = rcu_dereference(queue->rps_map);
 546         if (map)
 547                 for (i = 0; i < map->len; i++)
 548                         cpumask_set_cpu(map->cpus[i], mask);
 549
 550         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 551         if (PAGE_SIZE - len < 3) {
 552                 rcu_read_unlock();
 553                 free_cpumask_var(mask);
 554                 return -EINVAL;
 555         }
 556         rcu_read_unlock();
 557
 558         free_cpumask_var(mask);
 559         len += sprintf(buf + len, "\n");
 560         return len;
 561 }
 562
 563 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 564                       struct rx_queue_attribute *attribute,
 565                       const char *buf, size_t len)
 566 {
 567         struct rps_map *old_map, *map;
 568         cpumask_var_t mask;
 569         int err, cpu, i;
 570         static DEFINE_SPINLOCK(rps_map_lock);
 571
 572         if (!capable(CAP_NET_ADMIN))
 573                 return -EPERM;
 574
 575         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 576                 return -ENOMEM;
 577
 578         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 579         if (err) {
 580                 free_cpumask_var(mask);
 581                 return err;
 582         }
 583
 584         map = kzalloc(max_t(unsigned int,
 585             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 586             GFP_KERNEL);
 587         if (!map) {
 588                 free_cpumask_var(mask);
 589                 return -ENOMEM;
 590         }
 591
 592         i = 0;
 593         for_each_cpu_and(cpu, mask, cpu_online_mask)
 594                 map->cpus[i++] = cpu;
 595
 596         if (i)
 597                 map->len = i;
 598         else {
 599                 kfree(map);
 600                 map = NULL;
 601         }
 602
 603         spin_lock(&rps_map_lock);
 604         old_map = rcu_dereference_protected(queue->rps_map,
 605                                             lockdep_is_held(&rps_map_lock));
 606         rcu_assign_pointer(queue->rps_map, map);
 607         spin_unlock(&rps_map_lock);
 608
 609         if (map)
 610                 static_key_slow_inc(&rps_needed);
 611         if (old_map) {
 612                 kfree_rcu(old_map, rcu);
 613                 static_key_slow_dec(&rps_needed);
 614         }
 615         free_cpumask_var(mask);
 616         return len;
 617 }
 618
 619 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 620                                            struct rx_queue_attribute *attr,
 621                                            char *buf)
 622 {
 623         struct rps_dev_flow_table *flow_table;
 624         unsigned long val = 0;
 625
 626         rcu_read_lock();
 627         flow_table = rcu_dereference(queue->rps_flow_table);
 628         if (flow_table)
 629                 val = (unsigned long)flow_table->mask + 1;
 630         rcu_read_unlock();
 631
 632         return sprintf(buf, "%lu\n", val);
 633 }
 634
 635 static void rps_dev_flow_table_release_work(struct work_struct *work)
 636 {
 637         struct rps_dev_flow_table *table = container_of(work,
 638             struct rps_dev_flow_table, free_work);
 639
 640         vfree(table);
 641 }
 642
 643 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 644 {
 645         struct rps_dev_flow_table *table = container_of(rcu,
 646             struct rps_dev_flow_table, rcu);
 647
 648         INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
 649         schedule_work(&table->free_work);
 650 }
 651
 652 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 653                                      struct rx_queue_attribute *attr,
 654                                      const char *buf, size_t len)
 655 {
 656         unsigned long mask, count;
 657         struct rps_dev_flow_table *table, *old_table;
 658         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 659         int rc;
 660
 661         if (!capable(CAP_NET_ADMIN))
 662                 return -EPERM;
 663
 664         rc = kstrtoul(buf, 0, &count);
 665         if (rc < 0)
 666                 return rc;
 667
 668         if (count) {
 669                 mask = count - 1;
 670                 /* mask = roundup_pow_of_two(count) - 1;
 671                  * without overflows...
 672                  */
 673                 while ((mask | (mask >> 1)) != mask)
 674                         mask |= (mask >> 1);
 675                 /* On 64 bit arches, must check mask fits in table->mask (u32),
 676                  * and on 32bit arches, must check RPS_DEV_FLOW_TABLE_SIZE(mask + 1)
 677                  * doesnt overflow.
 678                  */
 679 #if BITS_PER_LONG > 32
 680                 if (mask > (unsigned long)(u32)mask)
 681                         return -EINVAL;
 682 #else
 683                 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
 684                                 / sizeof(struct rps_dev_flow)) {
 685                         /* Enforce a limit to prevent overflow */
 686                         return -EINVAL;
 687                 }
 688 #endif
 689                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
 690                 if (!table)
 691                         return -ENOMEM;
 692
 693                 table->mask = mask;
 694                 for (count = 0; count <= mask; count++)
 695                         table->flows[count].cpu = RPS_NO_CPU;
 696         } else
 697                 table = NULL;
 698
 699         spin_lock(&rps_dev_flow_lock);
 700         old_table = rcu_dereference_protected(queue->rps_flow_table,
 701                                               lockdep_is_held(&rps_dev_flow_lock));
 702         rcu_assign_pointer(queue->rps_flow_table, table);
 703         spin_unlock(&rps_dev_flow_lock);
 704
 705         if (old_table)
 706                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 707
 708         return len;
 709 }
 710
 711 static struct rx_queue_attribute rps_cpus_attribute =
 712         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 713
 714
 715 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 716         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 717             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 718
 719 static struct attribute *rx_queue_default_attrs[] = {
 720         &rps_cpus_attribute.attr,
 721         &rps_dev_flow_table_cnt_attribute.attr,
 722         NULL
 723 };
 724
 725 static void rx_queue_release(struct kobject *kobj)
 726 {
 727         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 728         struct rps_map *map;
 729         struct rps_dev_flow_table *flow_table;
 730
 731
 732         map = rcu_dereference_protected(queue->rps_map, 1);
 733         if (map) {
 734                 RCU_INIT_POINTER(queue->rps_map, NULL);
 735                 kfree_rcu(map, rcu);
 736         }
 737
 738         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 739         if (flow_table) {
 740                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 741                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 742         }
 743
 744         memset(kobj, 0, sizeof(*kobj));
 745         dev_put(queue->dev);
 746 }
 747
 748 static struct kobj_type rx_queue_ktype = {
 749         .sysfs_ops = &rx_queue_sysfs_ops,
 750         .release = rx_queue_release,
 751         .default_attrs = rx_queue_default_attrs,
 752 };
 753
 754 static int rx_queue_add_kobject(struct net_device *net, int index)
 755 {
 756         struct netdev_rx_queue *queue = net->_rx + index;
 757         struct kobject *kobj = &queue->kobj;
 758         int error = 0;
 759
 760         kobj->kset = net->queues_kset;
 761         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 762             "rx-%u", index);
 763         if (error) {
 764                 kobject_put(kobj);
 765                 return error;
 766         }
 767
 768         kobject_uevent(kobj, KOBJ_ADD);
 769         dev_hold(queue->dev);
 770
 771         return error;
 772 }
 773 #endif /* CONFIG_RPS */
 774
 775 int
 776 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
 777 {
 778 #ifdef CONFIG_RPS
 779         int i;
 780         int error = 0;
 781
 782         for (i = old_num; i < new_num; i++) {
 783                 error = rx_queue_add_kobject(net, i);
 784                 if (error) {
 785                         new_num = old_num;
 786                         break;
 787                 }
 788         }
 789
 790         while (--i >= new_num)
 791                 kobject_put(&net->_rx[i].kobj);
 792
 793         return error;
 794 #else
 795         return 0;
 796 #endif
 797 }
 798
 799 #ifdef CONFIG_SYSFS
 800 /*
 801  * netdev_queue sysfs structures and functions.
 802  */
 803 struct netdev_queue_attribute {
 804         struct attribute attr;
 805         ssize_t (*show)(struct netdev_queue *queue,
 806             struct netdev_queue_attribute *attr, char *buf);
 807         ssize_t (*store)(struct netdev_queue *queue,
 808             struct netdev_queue_attribute *attr, const char *buf, size_t len);
 809 };
 810 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
 811     struct netdev_queue_attribute, attr)
 812
 813 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 814
 815 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 816                                       struct attribute *attr, char *buf)
 817 {
 818         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 819         struct netdev_queue *queue = to_netdev_queue(kobj);
 820
 821         if (!attribute->show)
 822                 return -EIO;
 823
 824         return attribute->show(queue, attribute, buf);
 825 }
 826
 827 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 828                                        struct attribute *attr,
 829                                        const char *buf, size_t count)
 830 {
 831         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 832         struct netdev_queue *queue = to_netdev_queue(kobj);
 833
 834         if (!attribute->store)
 835                 return -EIO;
 836
 837         return attribute->store(queue, attribute, buf, count);
 838 }
 839
 840 static const struct sysfs_ops netdev_queue_sysfs_ops = {
 841         .show = netdev_queue_attr_show,
 842         .store = netdev_queue_attr_store,
 843 };
 844
 845 static ssize_t show_trans_timeout(struct netdev_queue *queue,
 846                                   struct netdev_queue_attribute *attribute,
 847                                   char *buf)
 848 {
 849         unsigned long trans_timeout;
 850
 851         spin_lock_irq(&queue->_xmit_lock);
 852         trans_timeout = queue->trans_timeout;
 853         spin_unlock_irq(&queue->_xmit_lock);
 854
 855         return sprintf(buf, "%lu", trans_timeout);
 856 }
 857
 858 static struct netdev_queue_attribute queue_trans_timeout =
 859         __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
 860
 861 #ifdef CONFIG_BQL
 862 /*
 863  * Byte queue limits sysfs structures and functions.
 864  */
 865 static ssize_t bql_show(char *buf, unsigned int value)
 866 {
 867         return sprintf(buf, "%u\n", value);
 868 }
 869
 870 static ssize_t bql_set(const char *buf, const size_t count,
 871                        unsigned int *pvalue)
 872 {
 873         unsigned int value;
 874         int err;
 875
 876         if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
 877                 value = DQL_MAX_LIMIT;
 878         else {
 879                 err = kstrtouint(buf, 10, &value);
 880                 if (err < 0)
 881                         return err;
 882                 if (value > DQL_MAX_LIMIT)
 883                         return -EINVAL;
 884         }
 885
 886         *pvalue = value;
 887
 888         return count;
 889 }
 890
 891 static ssize_t bql_show_hold_time(struct netdev_queue *queue,
 892                                   struct netdev_queue_attribute *attr,
 893                                   char *buf)
 894 {
 895         struct dql *dql = &queue->dql;
 896
 897         return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
 898 }
 899
 900 static ssize_t bql_set_hold_time(struct netdev_queue *queue,
 901                                  struct netdev_queue_attribute *attribute,
 902                                  const char *buf, size_t len)
 903 {
 904         struct dql *dql = &queue->dql;
 905         unsigned int value;
 906         int err;
 907
 908         err = kstrtouint(buf, 10, &value);
 909         if (err < 0)
 910                 return err;
 911
 912         dql->slack_hold_time = msecs_to_jiffies(value);
 913
 914         return len;
 915 }
 916
 917 static struct netdev_queue_attribute bql_hold_time_attribute =
 918         __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
 919             bql_set_hold_time);
 920
 921 static ssize_t bql_show_inflight(struct netdev_queue *queue,
 922                                  struct netdev_queue_attribute *attr,
 923                                  char *buf)
 924 {
 925         struct dql *dql = &queue->dql;
 926
 927         return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
 928 }
 929
 930 static struct netdev_queue_attribute bql_inflight_attribute =
 931         __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
 932
 933 #define BQL_ATTR(NAME, FIELD)                                           \
 934 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue,            \
 935                                  struct netdev_queue_attribute *attr,   \
 936                                  char *buf)                             \
 937 {                                                                       \
 938         return bql_show(buf, queue->dql.FIELD);                         \
 939 }                                                                       \
 940                                                                         \
 941 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue,             \
 942                                 struct netdev_queue_attribute *attr,    \
 943                                 const char *buf, size_t len)            \
 944 {                                                                       \
 945         return bql_set(buf, len, &queue->dql.FIELD);                    \
 946 }                                                                       \
 947                                                                         \
 948 static struct netdev_queue_attribute bql_ ## NAME ## _attribute =       \
 949         __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME,              \
 950             bql_set_ ## NAME);
 951
 952 BQL_ATTR(limit, limit)
 953 BQL_ATTR(limit_max, max_limit)
 954 BQL_ATTR(limit_min, min_limit)
 955
 956 static struct attribute *dql_attrs[] = {
 957         &bql_limit_attribute.attr,
 958         &bql_limit_max_attribute.attr,
 959         &bql_limit_min_attribute.attr,
 960         &bql_hold_time_attribute.attr,
 961         &bql_inflight_attribute.attr,
 962         NULL
 963 };
 964
 965 static struct attribute_group dql_group = {
 966         .name  = "byte_queue_limits",
 967         .attrs  = dql_attrs,
 968 };
 969 #endif /* CONFIG_BQL */
 970
 971 #ifdef CONFIG_XPS
 972 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
 973 {
 974         struct net_device *dev = queue->dev;
 975         int i;
 976
 977         for (i = 0; i < dev->num_tx_queues; i++)
 978                 if (queue == &dev->_tx[i])
 979                         break;
 980
 981         BUG_ON(i >= dev->num_tx_queues);
 982
 983         return i;
 984 }
 985
 986
 987 static ssize_t show_xps_map(struct netdev_queue *queue,
 988                             struct netdev_queue_attribute *attribute, char *buf)
 989 {
 990         struct net_device *dev = queue->dev;
 991         struct xps_dev_maps *dev_maps;
 992         cpumask_var_t mask;
 993         unsigned long index;
 994         size_t len = 0;
 995         int i;
 996
 997         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 998                 return -ENOMEM;
 999
1000         index = get_netdev_queue_index(queue);
1001
1002         rcu_read_lock();
1003         dev_maps = rcu_dereference(dev->xps_maps);
1004         if (dev_maps) {
1005                 for_each_possible_cpu(i) {
1006                         struct xps_map *map =
1007                             rcu_dereference(dev_maps->cpu_map[i]);
1008                         if (map) {
1009                                 int j;
1010                                 for (j = 0; j < map->len; j++) {
1011                                         if (map->queues[j] == index) {
1012                                                 cpumask_set_cpu(i, mask);
1013                                                 break;
1014                                         }
1015                                 }
1016                         }
1017                 }
1018         }
1019         rcu_read_unlock();
1020
1021         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
1022         if (PAGE_SIZE - len < 3) {
1023                 free_cpumask_var(mask);
1024                 return -EINVAL;
1025         }
1026
1027         free_cpumask_var(mask);
1028         len += sprintf(buf + len, "\n");
1029         return len;
1030 }
1031
1032 static DEFINE_MUTEX(xps_map_mutex);
1033 #define xmap_dereference(P)             \
1034         rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1035
1036 static void xps_queue_release(struct netdev_queue *queue)
1037 {
1038         struct net_device *dev = queue->dev;
1039         struct xps_dev_maps *dev_maps;
1040         struct xps_map *map;
1041         unsigned long index;
1042         int i, pos, nonempty = 0;
1043
1044         index = get_netdev_queue_index(queue);
1045
1046         mutex_lock(&xps_map_mutex);
1047         dev_maps = xmap_dereference(dev->xps_maps);
1048
1049         if (dev_maps) {
1050                 for_each_possible_cpu(i) {
1051                         map = xmap_dereference(dev_maps->cpu_map[i]);
1052                         if (!map)
1053                                 continue;
1054
1055                         for (pos = 0; pos < map->len; pos++)
1056                                 if (map->queues[pos] == index)
1057                                         break;
1058
1059                         if (pos < map->len) {
1060                                 if (map->len > 1)
1061                                         map->queues[pos] =
1062                                             map->queues[--map->len];
1063                                 else {
1064                                         RCU_INIT_POINTER(dev_maps->cpu_map[i],
1065                                             NULL);
1066                                         kfree_rcu(map, rcu);
1067                                         map = NULL;
1068                                 }
1069                         }
1070                         if (map)
1071                                 nonempty = 1;
1072                 }
1073
1074                 if (!nonempty) {
1075                         RCU_INIT_POINTER(dev->xps_maps, NULL);
1076                         kfree_rcu(dev_maps, rcu);
1077                 }
1078         }
1079         mutex_unlock(&xps_map_mutex);
1080 }
1081
1082 static ssize_t store_xps_map(struct netdev_queue *queue,
1083                       struct netdev_queue_attribute *attribute,
1084                       const char *buf, size_t len)
1085 {
1086         struct net_device *dev = queue->dev;
1087         cpumask_var_t mask;
1088         int err, i, cpu, pos, map_len, alloc_len, need_set;
1089         unsigned long index;
1090         struct xps_map *map, *new_map;
1091         struct xps_dev_maps *dev_maps, *new_dev_maps;
1092         int nonempty = 0;
1093         int numa_node_id = -2;
1094
1095         if (!capable(CAP_NET_ADMIN))
1096                 return -EPERM;
1097
1098         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
1099                 return -ENOMEM;
1100
1101         index = get_netdev_queue_index(queue);
1102
1103         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
1104         if (err) {
1105                 free_cpumask_var(mask);
1106                 return err;
1107         }
1108
1109         new_dev_maps = kzalloc(max_t(unsigned int,
1110             XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
1111         if (!new_dev_maps) {
1112                 free_cpumask_var(mask);
1113                 return -ENOMEM;
1114         }
1115
1116         mutex_lock(&xps_map_mutex);
1117
1118         dev_maps = xmap_dereference(dev->xps_maps);
1119
1120         for_each_possible_cpu(cpu) {
1121                 map = dev_maps ?
1122                         xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
1123                 new_map = map;
1124                 if (map) {
1125                         for (pos = 0; pos < map->len; pos++)
1126                                 if (map->queues[pos] == index)
1127                                         break;
1128                         map_len = map->len;
1129                         alloc_len = map->alloc_len;
1130                 } else
1131                         pos = map_len = alloc_len = 0;
1132
1133                 need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);
1134 #ifdef CONFIG_NUMA
1135                 if (need_set) {
1136                         if (numa_node_id == -2)
1137                                 numa_node_id = cpu_to_node(cpu);
1138                         else if (numa_node_id != cpu_to_node(cpu))
1139                                 numa_node_id = -1;
1140                 }
1141 #endif
1142                 if (need_set && pos >= map_len) {
1143                         /* Need to add queue to this CPU's map */
1144                         if (map_len >= alloc_len) {
1145                                 alloc_len = alloc_len ?
1146                                     2 * alloc_len : XPS_MIN_MAP_ALLOC;
1147                                 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
1148                                                        GFP_KERNEL,
1149                                                        cpu_to_node(cpu));
1150                                 if (!new_map)
1151                                         goto error;
1152                                 new_map->alloc_len = alloc_len;
1153                                 for (i = 0; i < map_len; i++)
1154                                         new_map->queues[i] = map->queues[i];
1155                                 new_map->len = map_len;
1156                         }
1157                         new_map->queues[new_map->len++] = index;
1158                 } else if (!need_set && pos < map_len) {
1159                         /* Need to remove queue from this CPU's map */
1160                         if (map_len > 1)
1161                                 new_map->queues[pos] =
1162                                     new_map->queues[--new_map->len];
1163                         else
1164                                 new_map = NULL;
1165                 }
1166                 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
1167         }
1168
1169         /* Cleanup old maps */
1170         for_each_possible_cpu(cpu) {
1171                 map = dev_maps ?
1172                         xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
1173                 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
1174                         kfree_rcu(map, rcu);
1175                 if (new_dev_maps->cpu_map[cpu])
1176                         nonempty = 1;
1177         }
1178
1179         if (nonempty) {
1180                 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
1181         } else {
1182                 kfree(new_dev_maps);
1183                 RCU_INIT_POINTER(dev->xps_maps, NULL);
1184         }
1185
1186         if (dev_maps)
1187                 kfree_rcu(dev_maps, rcu);
1188
1189         netdev_queue_numa_node_write(queue, (numa_node_id >= 0) ? numa_node_id :
1190                                             NUMA_NO_NODE);
1191
1192         mutex_unlock(&xps_map_mutex);
1193
1194         free_cpumask_var(mask);
1195         return len;
1196
1197 error:
1198         mutex_unlock(&xps_map_mutex);
1199
1200         if (new_dev_maps)
1201                 for_each_possible_cpu(i)
1202                         kfree(rcu_dereference_protected(
1203                                 new_dev_maps->cpu_map[i],
1204                                 1));
1205         kfree(new_dev_maps);
1206         free_cpumask_var(mask);
1207         return -ENOMEM;
1208 }
1209
1210 static struct netdev_queue_attribute xps_cpus_attribute =
1211     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1212 #endif /* CONFIG_XPS */
1213
1214 static struct attribute *netdev_queue_default_attrs[] = {
1215         &queue_trans_timeout.attr,
1216 #ifdef CONFIG_XPS
1217         &xps_cpus_attribute.attr,
1218 #endif
1219         NULL
1220 };
1221
1222 static void netdev_queue_release(struct kobject *kobj)
1223 {
1224         struct netdev_queue *queue = to_netdev_queue(kobj);
1225
1226 #ifdef CONFIG_XPS
1227         xps_queue_release(queue);
1228 #endif
1229
1230         memset(kobj, 0, sizeof(*kobj));
1231         dev_put(queue->dev);
1232 }
1233
1234 static struct kobj_type netdev_queue_ktype = {
1235         .sysfs_ops = &netdev_queue_sysfs_ops,
1236         .release = netdev_queue_release,
1237         .default_attrs = netdev_queue_default_attrs,
1238 };
1239
1240 static int netdev_queue_add_kobject(struct net_device *net, int index)
1241 {
1242         struct netdev_queue *queue = net->_tx + index;
1243         struct kobject *kobj = &queue->kobj;
1244         int error = 0;
1245
1246         kobj->kset = net->queues_kset;
1247         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1248             "tx-%u", index);
1249         if (error)
1250                 goto exit;
1251
1252 #ifdef CONFIG_BQL
1253         error = sysfs_create_group(kobj, &dql_group);
1254         if (error)
1255                 goto exit;
1256 #endif
1257
1258         kobject_uevent(kobj, KOBJ_ADD);
1259         dev_hold(queue->dev);
1260
1261         return 0;
1262 exit:
1263         kobject_put(kobj);
1264         return error;
1265 }
1266 #endif /* CONFIG_SYSFS */
1267
1268 int
1269 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1270 {
1271 #ifdef CONFIG_SYSFS
1272         int i;
1273         int error = 0;
1274
1275         for (i = old_num; i < new_num; i++) {
1276                 error = netdev_queue_add_kobject(net, i);
1277                 if (error) {
1278                         new_num = old_num;
1279                         break;
1280                 }
1281         }
1282
1283         while (--i >= new_num) {
1284                 struct netdev_queue *queue = net->_tx + i;
1285
1286 #ifdef CONFIG_BQL
1287                 sysfs_remove_group(&queue->kobj, &dql_group);
1288 #endif
1289                 kobject_put(&queue->kobj);
1290         }
1291
1292         return error;
1293 #else
1294         return 0;
1295 #endif /* CONFIG_SYSFS */
1296 }
1297
1298 static int register_queue_kobjects(struct net_device *net)
1299 {
1300         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1301
1302 #ifdef CONFIG_SYSFS
1303         net->queues_kset = kset_create_and_add("queues",
1304             NULL, &net->dev.kobj);
1305         if (!net->queues_kset)
1306                 return -ENOMEM;
1307 #endif
1308
1309 #ifdef CONFIG_RPS
1310         real_rx = net->real_num_rx_queues;
1311 #endif
1312         real_tx = net->real_num_tx_queues;
1313
1314         error = net_rx_queue_update_kobjects(net, 0, real_rx);
1315         if (error)
1316                 goto error;
1317         rxq = real_rx;
1318
1319         error = netdev_queue_update_kobjects(net, 0, real_tx);
1320         if (error)
1321                 goto error;
1322         txq = real_tx;
1323
1324         return 0;
1325
1326 error:
1327         netdev_queue_update_kobjects(net, txq, 0);
1328         net_rx_queue_update_kobjects(net, rxq, 0);
1329         return error;
1330 }
1331
1332 static void remove_queue_kobjects(struct net_device *net)
1333 {
1334         int real_rx = 0, real_tx = 0;
1335
1336 #ifdef CONFIG_RPS
1337         real_rx = net->real_num_rx_queues;
1338 #endif
1339         real_tx = net->real_num_tx_queues;
1340
1341         net_rx_queue_update_kobjects(net, real_rx, 0);
1342         netdev_queue_update_kobjects(net, real_tx, 0);
1343 #ifdef CONFIG_SYSFS
1344         kset_unregister(net->queues_kset);
1345 #endif
1346 }
1347
1348 static void *net_grab_current_ns(void)
1349 {
1350         struct net *ns = current->nsproxy->net_ns;
1351 #ifdef CONFIG_NET_NS
1352         if (ns)
1353                 atomic_inc(&ns->passive);
1354 #endif
1355         return ns;
1356 }
1357
1358 static const void *net_initial_ns(void)
1359 {
1360         return &init_net;
1361 }
1362
1363 static const void *net_netlink_ns(struct sock *sk)
1364 {
1365         return sock_net(sk);
1366 }
1367
1368 struct kobj_ns_type_operations net_ns_type_operations = {
1369         .type = KOBJ_NS_TYPE_NET,
1370         .grab_current_ns = net_grab_current_ns,
1371         .netlink_ns = net_netlink_ns,
1372         .initial_ns = net_initial_ns,
1373         .drop_ns = net_drop_ns,
1374 };
1375 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1376
1377 #ifdef CONFIG_HOTPLUG
1378 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1379 {
1380         struct net_device *dev = to_net_dev(d);
1381         int retval;
1382
1383         /* pass interface to uevent. */
1384         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1385         if (retval)
1386                 goto exit;
1387
1388         /* pass ifindex to uevent.
1389          * ifindex is useful as it won't change (interface name may change)
1390          * and is what RtNetlink uses natively. */
1391         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1392
1393 exit:
1394         return retval;
1395 }
1396 #endif
1397
1398 /*
1399  *      netdev_release -- destroy and free a dead device.
1400  *      Called when last reference to device kobject is gone.
1401  */
1402 static void netdev_release(struct device *d)
1403 {
1404         struct net_device *dev = to_net_dev(d);
1405
1406         BUG_ON(dev->reg_state != NETREG_RELEASED);
1407
1408         kfree(dev->ifalias);
1409         kfree((char *)dev - dev->padded);
1410 }
1411
1412 static const void *net_namespace(struct device *d)
1413 {
1414         struct net_device *dev;
1415         dev = container_of(d, struct net_device, dev);
1416         return dev_net(dev);
1417 }
1418
1419 static struct class net_class = {
1420         .name = "net",
1421         .dev_release = netdev_release,
1422 #ifdef CONFIG_SYSFS
1423         .dev_attrs = net_class_attributes,
1424 #endif /* CONFIG_SYSFS */
1425 #ifdef CONFIG_HOTPLUG
1426         .dev_uevent = netdev_uevent,
1427 #endif
1428         .ns_type = &net_ns_type_operations,
1429         .namespace = net_namespace,
1430 };
1431
1432 /* Delete sysfs entries but hold kobject reference until after all
1433  * netdev references are gone.
1434  */
1435 void netdev_unregister_kobject(struct net_device * net)
1436 {
1437         struct device *dev = &(net->dev);
1438
1439         kobject_get(&dev->kobj);
1440
1441         remove_queue_kobjects(net);
1442
1443         device_del(dev);
1444 }
1445
1446 /* Create sysfs entries for network device. */
1447 int netdev_register_kobject(struct net_device *net)
1448 {
1449         struct device *dev = &(net->dev);
1450         const struct attribute_group **groups = net->sysfs_groups;
1451         int error = 0;
1452
1453         device_initialize(dev);
1454         dev->class = &net_class;
1455         dev->platform_data = net;
1456         dev->groups = groups;
1457
1458         dev_set_name(dev, "%s", net->name);
1459
1460 #ifdef CONFIG_SYSFS
1461         /* Allow for a device specific group */
1462         if (*groups)
1463                 groups++;
1464
1465         *groups++ = &netstat_group;
1466 #ifdef CONFIG_WIRELESS_EXT_SYSFS
1467         if (net->ieee80211_ptr)
1468                 *groups++ = &wireless_group;
1469 #ifdef CONFIG_WIRELESS_EXT
1470         else if (net->wireless_handlers)
1471                 *groups++ = &wireless_group;
1472 #endif
1473 #endif
1474 #endif /* CONFIG_SYSFS */
1475
1476         error = device_add(dev);
1477         if (error)
1478                 return error;
1479
1480         error = register_queue_kobjects(net);
1481         if (error) {
1482                 device_del(dev);
1483                 return error;
1484         }
1485
1486         return error;
1487 }
1488
1489 int netdev_class_create_file(struct class_attribute *class_attr)
1490 {
1491         return class_create_file(&net_class, class_attr);
1492 }
1493 EXPORT_SYMBOL(netdev_class_create_file);
1494
1495 void netdev_class_remove_file(struct class_attribute *class_attr)
1496 {
1497         class_remove_file(&net_class, class_attr);
1498 }
1499 EXPORT_SYMBOL(netdev_class_remove_file);
1500
1501 int netdev_kobject_init(void)
1502 {
1503         kobj_ns_type_register(&net_ns_type_operations);
1504         return class_register(&net_class);
1505 }