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 <net/sock.h>
  18 #include <linux/rtnetlink.h>
  19 #include <linux/wireless.h>
  20 #include <linux/vmalloc.h>
  21 #include <net/wext.h>
  22
  23 #include "net-sysfs.h"
  24
  25 #ifdef CONFIG_SYSFS
  26 static const char fmt_hex[] = "%#x\n";
  27 static const char fmt_long_hex[] = "%#lx\n";
  28 static const char fmt_dec[] = "%d\n";
  29 static const char fmt_ulong[] = "%lu\n";
  30
  31 static inline int dev_isalive(const struct net_device *dev)
  32 {
  33         return dev->reg_state <= NETREG_REGISTERED;
  34 }
  35
  36 /* use same locking rules as GIF* ioctl's */
  37 static ssize_t netdev_show(const struct device *dev,
  38                            struct device_attribute *attr, char *buf,
  39                            ssize_t (*format)(const struct net_device *, char *))
  40 {
  41         struct net_device *net = to_net_dev(dev);
  42         ssize_t ret = -EINVAL;
  43
  44         read_lock(&dev_base_lock);
  45         if (dev_isalive(net))
  46                 ret = (*format)(net, buf);
  47         read_unlock(&dev_base_lock);
  48
  49         return ret;
  50 }
  51
  52 /* generate a show function for simple field */
  53 #define NETDEVICE_SHOW(field, format_string)                            \
  54 static ssize_t format_##field(const struct net_device *net, char *buf)  \
  55 {                                                                       \
  56         return sprintf(buf, format_string, net->field);                 \
  57 }                                                                       \
  58 static ssize_t show_##field(struct device *dev,                         \
  59                             struct device_attribute *attr, char *buf)   \
  60 {                                                                       \
  61         return netdev_show(dev, attr, buf, format_##field);             \
  62 }
  63
  64
  65 /* use same locking and permission rules as SIF* ioctl's */
  66 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  67                             const char *buf, size_t len,
  68                             int (*set)(struct net_device *, unsigned long))
  69 {
  70         struct net_device *net = to_net_dev(dev);
  71         char *endp;
  72         unsigned long new;
  73         int ret = -EINVAL;
  74
  75         if (!capable(CAP_NET_ADMIN))
  76                 return -EPERM;
  77
  78         new = simple_strtoul(buf, &endp, 0);
  79         if (endp == buf)
  80                 goto err;
  81
  82         if (!rtnl_trylock())
  83                 return restart_syscall();
  84
  85         if (dev_isalive(net)) {
  86                 if ((ret = (*set)(net, new)) == 0)
  87                         ret = len;
  88         }
  89         rtnl_unlock();
  90  err:
  91         return ret;
  92 }
  93
  94 NETDEVICE_SHOW(dev_id, fmt_hex);
  95 NETDEVICE_SHOW(addr_len, fmt_dec);
  96 NETDEVICE_SHOW(iflink, fmt_dec);
  97 NETDEVICE_SHOW(ifindex, fmt_dec);
  98 NETDEVICE_SHOW(features, fmt_long_hex);
  99 NETDEVICE_SHOW(type, fmt_dec);
 100 NETDEVICE_SHOW(link_mode, fmt_dec);
 101
 102 /* use same locking rules as GIFHWADDR ioctl's */
 103 static ssize_t show_address(struct device *dev, struct device_attribute *attr,
 104                             char *buf)
 105 {
 106         struct net_device *net = to_net_dev(dev);
 107         ssize_t ret = -EINVAL;
 108
 109         read_lock(&dev_base_lock);
 110         if (dev_isalive(net))
 111                 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
 112         read_unlock(&dev_base_lock);
 113         return ret;
 114 }
 115
 116 static ssize_t show_broadcast(struct device *dev,
 117                             struct device_attribute *attr, char *buf)
 118 {
 119         struct net_device *net = to_net_dev(dev);
 120         if (dev_isalive(net))
 121                 return sysfs_format_mac(buf, net->broadcast, net->addr_len);
 122         return -EINVAL;
 123 }
 124
 125 static ssize_t show_carrier(struct device *dev,
 126                             struct device_attribute *attr, char *buf)
 127 {
 128         struct net_device *netdev = to_net_dev(dev);
 129         if (netif_running(netdev)) {
 130                 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
 131         }
 132         return -EINVAL;
 133 }
 134
 135 static ssize_t show_speed(struct device *dev,
 136                           struct device_attribute *attr, char *buf)
 137 {
 138         struct net_device *netdev = to_net_dev(dev);
 139         int ret = -EINVAL;
 140
 141         if (!rtnl_trylock())
 142                 return restart_syscall();
 143
 144         if (netif_running(netdev) &&
 145             netdev->ethtool_ops &&
 146             netdev->ethtool_ops->get_settings) {
 147                 struct ethtool_cmd cmd = { ETHTOOL_GSET };
 148
 149                 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
 150                         ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd));
 151         }
 152         rtnl_unlock();
 153         return ret;
 154 }
 155
 156 static ssize_t show_duplex(struct device *dev,
 157                            struct device_attribute *attr, char *buf)
 158 {
 159         struct net_device *netdev = to_net_dev(dev);
 160         int ret = -EINVAL;
 161
 162         if (!rtnl_trylock())
 163                 return restart_syscall();
 164
 165         if (netif_running(netdev) &&
 166             netdev->ethtool_ops &&
 167             netdev->ethtool_ops->get_settings) {
 168                 struct ethtool_cmd cmd = { ETHTOOL_GSET };
 169
 170                 if (!netdev->ethtool_ops->get_settings(netdev, &cmd))
 171                         ret = sprintf(buf, "%s\n", 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) 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 static struct device_attribute net_class_attributes[] = {
 295         __ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
 296         __ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
 297         __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
 298         __ATTR(iflink, S_IRUGO, show_iflink, NULL),
 299         __ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
 300         __ATTR(features, S_IRUGO, show_features, NULL),
 301         __ATTR(type, S_IRUGO, show_type, NULL),
 302         __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
 303         __ATTR(address, S_IRUGO, show_address, NULL),
 304         __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
 305         __ATTR(carrier, S_IRUGO, show_carrier, NULL),
 306         __ATTR(speed, S_IRUGO, show_speed, NULL),
 307         __ATTR(duplex, S_IRUGO, show_duplex, NULL),
 308         __ATTR(dormant, S_IRUGO, show_dormant, NULL),
 309         __ATTR(operstate, S_IRUGO, show_operstate, NULL),
 310         __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
 311         __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
 312         __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
 313                store_tx_queue_len),
 314         {}
 315 };
 316
 317 /* Show a given an attribute in the statistics group */
 318 static ssize_t netstat_show(const struct device *d,
 319                             struct device_attribute *attr, char *buf,
 320                             unsigned long offset)
 321 {
 322         struct net_device *dev = to_net_dev(d);
 323         ssize_t ret = -EINVAL;
 324
 325         WARN_ON(offset > sizeof(struct net_device_stats) ||
 326                         offset % sizeof(unsigned long) != 0);
 327
 328         read_lock(&dev_base_lock);
 329         if (dev_isalive(dev)) {
 330                 const struct net_device_stats *stats = dev_get_stats(dev);
 331                 ret = sprintf(buf, fmt_ulong,
 332                               *(unsigned long *)(((u8 *) stats) + offset));
 333         }
 334         read_unlock(&dev_base_lock);
 335         return ret;
 336 }
 337
 338 /* generate a read-only statistics attribute */
 339 #define NETSTAT_ENTRY(name)                                             \
 340 static ssize_t show_##name(struct device *d,                            \
 341                            struct device_attribute *attr, char *buf)    \
 342 {                                                                       \
 343         return netstat_show(d, attr, buf,                               \
 344                             offsetof(struct net_device_stats, name));   \
 345 }                                                                       \
 346 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
 347
 348 NETSTAT_ENTRY(rx_packets);
 349 NETSTAT_ENTRY(tx_packets);
 350 NETSTAT_ENTRY(rx_bytes);
 351 NETSTAT_ENTRY(tx_bytes);
 352 NETSTAT_ENTRY(rx_errors);
 353 NETSTAT_ENTRY(tx_errors);
 354 NETSTAT_ENTRY(rx_dropped);
 355 NETSTAT_ENTRY(tx_dropped);
 356 NETSTAT_ENTRY(multicast);
 357 NETSTAT_ENTRY(collisions);
 358 NETSTAT_ENTRY(rx_length_errors);
 359 NETSTAT_ENTRY(rx_over_errors);
 360 NETSTAT_ENTRY(rx_crc_errors);
 361 NETSTAT_ENTRY(rx_frame_errors);
 362 NETSTAT_ENTRY(rx_fifo_errors);
 363 NETSTAT_ENTRY(rx_missed_errors);
 364 NETSTAT_ENTRY(tx_aborted_errors);
 365 NETSTAT_ENTRY(tx_carrier_errors);
 366 NETSTAT_ENTRY(tx_fifo_errors);
 367 NETSTAT_ENTRY(tx_heartbeat_errors);
 368 NETSTAT_ENTRY(tx_window_errors);
 369 NETSTAT_ENTRY(rx_compressed);
 370 NETSTAT_ENTRY(tx_compressed);
 371
 372 static struct attribute *netstat_attrs[] = {
 373         &dev_attr_rx_packets.attr,
 374         &dev_attr_tx_packets.attr,
 375         &dev_attr_rx_bytes.attr,
 376         &dev_attr_tx_bytes.attr,
 377         &dev_attr_rx_errors.attr,
 378         &dev_attr_tx_errors.attr,
 379         &dev_attr_rx_dropped.attr,
 380         &dev_attr_tx_dropped.attr,
 381         &dev_attr_multicast.attr,
 382         &dev_attr_collisions.attr,
 383         &dev_attr_rx_length_errors.attr,
 384         &dev_attr_rx_over_errors.attr,
 385         &dev_attr_rx_crc_errors.attr,
 386         &dev_attr_rx_frame_errors.attr,
 387         &dev_attr_rx_fifo_errors.attr,
 388         &dev_attr_rx_missed_errors.attr,
 389         &dev_attr_tx_aborted_errors.attr,
 390         &dev_attr_tx_carrier_errors.attr,
 391         &dev_attr_tx_fifo_errors.attr,
 392         &dev_attr_tx_heartbeat_errors.attr,
 393         &dev_attr_tx_window_errors.attr,
 394         &dev_attr_rx_compressed.attr,
 395         &dev_attr_tx_compressed.attr,
 396         NULL
 397 };
 398
 399
 400 static struct attribute_group netstat_group = {
 401         .name  = "statistics",
 402         .attrs  = netstat_attrs,
 403 };
 404
 405 #ifdef CONFIG_WIRELESS_EXT_SYSFS
 406 /* helper function that does all the locking etc for wireless stats */
 407 static ssize_t wireless_show(struct device *d, char *buf,
 408                              ssize_t (*format)(const struct iw_statistics *,
 409                                                char *))
 410 {
 411         struct net_device *dev = to_net_dev(d);
 412         const struct iw_statistics *iw;
 413         ssize_t ret = -EINVAL;
 414
 415         if (!rtnl_trylock())
 416                 return restart_syscall();
 417         if (dev_isalive(dev)) {
 418                 iw = get_wireless_stats(dev);
 419                 if (iw)
 420                         ret = (*format)(iw, buf);
 421         }
 422         rtnl_unlock();
 423
 424         return ret;
 425 }
 426
 427 /* show function template for wireless fields */
 428 #define WIRELESS_SHOW(name, field, format_string)                       \
 429 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
 430 {                                                                       \
 431         return sprintf(buf, format_string, iw->field);                  \
 432 }                                                                       \
 433 static ssize_t show_iw_##name(struct device *d,                         \
 434                               struct device_attribute *attr, char *buf) \
 435 {                                                                       \
 436         return wireless_show(d, buf, format_iw_##name);                 \
 437 }                                                                       \
 438 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
 439
 440 WIRELESS_SHOW(status, status, fmt_hex);
 441 WIRELESS_SHOW(link, qual.qual, fmt_dec);
 442 WIRELESS_SHOW(level, qual.level, fmt_dec);
 443 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
 444 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
 445 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
 446 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
 447 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
 448 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
 449 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
 450
 451 static struct attribute *wireless_attrs[] = {
 452         &dev_attr_status.attr,
 453         &dev_attr_link.attr,
 454         &dev_attr_level.attr,
 455         &dev_attr_noise.attr,
 456         &dev_attr_nwid.attr,
 457         &dev_attr_crypt.attr,
 458         &dev_attr_fragment.attr,
 459         &dev_attr_retries.attr,
 460         &dev_attr_misc.attr,
 461         &dev_attr_beacon.attr,
 462         NULL
 463 };
 464
 465 static struct attribute_group wireless_group = {
 466         .name = "wireless",
 467         .attrs = wireless_attrs,
 468 };
 469 #endif
 470
 471 #ifdef CONFIG_RPS
 472 /*
 473  * RX queue sysfs structures and functions.
 474  */
 475 struct rx_queue_attribute {
 476         struct attribute attr;
 477         ssize_t (*show)(struct netdev_rx_queue *queue,
 478             struct rx_queue_attribute *attr, char *buf);
 479         ssize_t (*store)(struct netdev_rx_queue *queue,
 480             struct rx_queue_attribute *attr, const char *buf, size_t len);
 481 };
 482 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 483     struct rx_queue_attribute, attr)
 484
 485 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 486
 487 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 488                                   char *buf)
 489 {
 490         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 491         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 492
 493         if (!attribute->show)
 494                 return -EIO;
 495
 496         return attribute->show(queue, attribute, buf);
 497 }
 498
 499 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 500                                    const char *buf, size_t count)
 501 {
 502         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 503         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 504
 505         if (!attribute->store)
 506                 return -EIO;
 507
 508         return attribute->store(queue, attribute, buf, count);
 509 }
 510
 511 static struct sysfs_ops rx_queue_sysfs_ops = {
 512         .show = rx_queue_attr_show,
 513         .store = rx_queue_attr_store,
 514 };
 515
 516 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 517                             struct rx_queue_attribute *attribute, char *buf)
 518 {
 519         struct rps_map *map;
 520         cpumask_var_t mask;
 521         size_t len = 0;
 522         int i;
 523
 524         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 525                 return -ENOMEM;
 526
 527         rcu_read_lock();
 528         map = rcu_dereference(queue->rps_map);
 529         if (map)
 530                 for (i = 0; i < map->len; i++)
 531                         cpumask_set_cpu(map->cpus[i], mask);
 532
 533         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 534         if (PAGE_SIZE - len < 3) {
 535                 rcu_read_unlock();
 536                 free_cpumask_var(mask);
 537                 return -EINVAL;
 538         }
 539         rcu_read_unlock();
 540
 541         free_cpumask_var(mask);
 542         len += sprintf(buf + len, "\n");
 543         return len;
 544 }
 545
 546 static void rps_map_release(struct rcu_head *rcu)
 547 {
 548         struct rps_map *map = container_of(rcu, struct rps_map, rcu);
 549
 550         kfree(map);
 551 }
 552
 553 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 554                       struct rx_queue_attribute *attribute,
 555                       const char *buf, size_t len)
 556 {
 557         struct rps_map *old_map, *map;
 558         cpumask_var_t mask;
 559         int err, cpu, i;
 560         static DEFINE_SPINLOCK(rps_map_lock);
 561
 562         if (!capable(CAP_NET_ADMIN))
 563                 return -EPERM;
 564
 565         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 566                 return -ENOMEM;
 567
 568         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 569         if (err) {
 570                 free_cpumask_var(mask);
 571                 return err;
 572         }
 573
 574         map = kzalloc(max_t(unsigned,
 575             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 576             GFP_KERNEL);
 577         if (!map) {
 578                 free_cpumask_var(mask);
 579                 return -ENOMEM;
 580         }
 581
 582         i = 0;
 583         for_each_cpu_and(cpu, mask, cpu_online_mask)
 584                 map->cpus[i++] = cpu;
 585
 586         if (i)
 587                 map->len = i;
 588         else {
 589                 kfree(map);
 590                 map = NULL;
 591         }
 592
 593         spin_lock(&rps_map_lock);
 594         old_map = queue->rps_map;
 595         rcu_assign_pointer(queue->rps_map, map);
 596         spin_unlock(&rps_map_lock);
 597
 598         if (old_map)
 599                 call_rcu(&old_map->rcu, rps_map_release);
 600
 601         free_cpumask_var(mask);
 602         return len;
 603 }
 604
 605 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 606                                            struct rx_queue_attribute *attr,
 607                                            char *buf)
 608 {
 609         struct rps_dev_flow_table *flow_table;
 610         unsigned int val = 0;
 611
 612         rcu_read_lock();
 613         flow_table = rcu_dereference(queue->rps_flow_table);
 614         if (flow_table)
 615                 val = flow_table->mask + 1;
 616         rcu_read_unlock();
 617
 618         return sprintf(buf, "%u\n", val);
 619 }
 620
 621 static void rps_dev_flow_table_release_work(struct work_struct *work)
 622 {
 623         struct rps_dev_flow_table *table = container_of(work,
 624             struct rps_dev_flow_table, free_work);
 625
 626         vfree(table);
 627 }
 628
 629 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 630 {
 631         struct rps_dev_flow_table *table = container_of(rcu,
 632             struct rps_dev_flow_table, rcu);
 633
 634         INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
 635         schedule_work(&table->free_work);
 636 }
 637
 638 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 639                                      struct rx_queue_attribute *attr,
 640                                      const char *buf, size_t len)
 641 {
 642         unsigned int count;
 643         char *endp;
 644         struct rps_dev_flow_table *table, *old_table;
 645         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 646
 647         if (!capable(CAP_NET_ADMIN))
 648                 return -EPERM;
 649
 650         count = simple_strtoul(buf, &endp, 0);
 651         if (endp == buf)
 652                 return -EINVAL;
 653
 654         if (count) {
 655                 int i;
 656
 657                 if (count > 1<<30) {
 658                         /* Enforce a limit to prevent overflow */
 659                         return -EINVAL;
 660                 }
 661                 count = roundup_pow_of_two(count);
 662                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
 663                 if (!table)
 664                         return -ENOMEM;
 665
 666                 table->mask = count - 1;
 667                 for (i = 0; i < count; i++)
 668                         table->flows[i].cpu = RPS_NO_CPU;
 669         } else
 670                 table = NULL;
 671
 672         spin_lock(&rps_dev_flow_lock);
 673         old_table = queue->rps_flow_table;
 674         rcu_assign_pointer(queue->rps_flow_table, table);
 675         spin_unlock(&rps_dev_flow_lock);
 676
 677         if (old_table)
 678                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 679
 680         return len;
 681 }
 682
 683 static struct rx_queue_attribute rps_cpus_attribute =
 684         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 685
 686
 687 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 688         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 689             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 690
 691 static struct attribute *rx_queue_default_attrs[] = {
 692         &rps_cpus_attribute.attr,
 693         &rps_dev_flow_table_cnt_attribute.attr,
 694         NULL
 695 };
 696
 697 static void rx_queue_release(struct kobject *kobj)
 698 {
 699         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 700         struct netdev_rx_queue *first = queue->first;
 701
 702         if (queue->rps_map)
 703                 call_rcu(&queue->rps_map->rcu, rps_map_release);
 704
 705         if (queue->rps_flow_table)
 706                 call_rcu(&queue->rps_flow_table->rcu,
 707                     rps_dev_flow_table_release);
 708
 709         if (atomic_dec_and_test(&first->count))
 710                 kfree(first);
 711 }
 712
 713 static struct kobj_type rx_queue_ktype = {
 714         .sysfs_ops = &rx_queue_sysfs_ops,
 715         .release = rx_queue_release,
 716         .default_attrs = rx_queue_default_attrs,
 717 };
 718
 719 static int rx_queue_add_kobject(struct net_device *net, int index)
 720 {
 721         struct netdev_rx_queue *queue = net->_rx + index;
 722         struct kobject *kobj = &queue->kobj;
 723         int error = 0;
 724
 725         kobj->kset = net->queues_kset;
 726         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 727             "rx-%u", index);
 728         if (error) {
 729                 kobject_put(kobj);
 730                 return error;
 731         }
 732
 733         kobject_uevent(kobj, KOBJ_ADD);
 734
 735         return error;
 736 }
 737
 738 static int rx_queue_register_kobjects(struct net_device *net)
 739 {
 740         int i;
 741         int error = 0;
 742
 743         net->queues_kset = kset_create_and_add("queues",
 744             NULL, &net->dev.kobj);
 745         if (!net->queues_kset)
 746                 return -ENOMEM;
 747         for (i = 0; i < net->num_rx_queues; i++) {
 748                 error = rx_queue_add_kobject(net, i);
 749                 if (error)
 750                         break;
 751         }
 752
 753         if (error)
 754                 while (--i >= 0)
 755                         kobject_put(&net->_rx[i].kobj);
 756
 757         return error;
 758 }
 759
 760 static void rx_queue_remove_kobjects(struct net_device *net)
 761 {
 762         int i;
 763
 764         for (i = 0; i < net->num_rx_queues; i++)
 765                 kobject_put(&net->_rx[i].kobj);
 766         kset_unregister(net->queues_kset);
 767 }
 768 #endif /* CONFIG_RPS */
 769 #endif /* CONFIG_SYSFS */
 770
 771 #ifdef CONFIG_HOTPLUG
 772 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
 773 {
 774         struct net_device *dev = to_net_dev(d);
 775         int retval;
 776
 777         if (!net_eq(dev_net(dev), &init_net))
 778                 return 0;
 779
 780         /* pass interface to uevent. */
 781         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
 782         if (retval)
 783                 goto exit;
 784
 785         /* pass ifindex to uevent.
 786          * ifindex is useful as it won't change (interface name may change)
 787          * and is what RtNetlink uses natively. */
 788         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
 789
 790 exit:
 791         return retval;
 792 }
 793 #endif
 794
 795 /*
 796  *      netdev_release -- destroy and free a dead device.
 797  *      Called when last reference to device kobject is gone.
 798  */
 799 static void netdev_release(struct device *d)
 800 {
 801         struct net_device *dev = to_net_dev(d);
 802
 803         BUG_ON(dev->reg_state != NETREG_RELEASED);
 804
 805         kfree(dev->ifalias);
 806         kfree((char *)dev - dev->padded);
 807 }
 808
 809 static struct class net_class = {
 810         .name = "net",
 811         .dev_release = netdev_release,
 812 #ifdef CONFIG_SYSFS
 813         .dev_attrs = net_class_attributes,
 814 #endif /* CONFIG_SYSFS */
 815 #ifdef CONFIG_HOTPLUG
 816         .dev_uevent = netdev_uevent,
 817 #endif
 818 };
 819
 820 /* Delete sysfs entries but hold kobject reference until after all
 821  * netdev references are gone.
 822  */
 823 void netdev_unregister_kobject(struct net_device * net)
 824 {
 825         struct device *dev = &(net->dev);
 826
 827         kobject_get(&dev->kobj);
 828
 829         if (!net_eq(dev_net(net), &init_net))
 830                 return;
 831
 832 #ifdef CONFIG_RPS
 833         rx_queue_remove_kobjects(net);
 834 #endif
 835
 836         device_del(dev);
 837 }
 838
 839 /* Create sysfs entries for network device. */
 840 int netdev_register_kobject(struct net_device *net)
 841 {
 842         struct device *dev = &(net->dev);
 843         const struct attribute_group **groups = net->sysfs_groups;
 844         int error = 0;
 845
 846         dev->class = &net_class;
 847         dev->platform_data = net;
 848         dev->groups = groups;
 849
 850         dev_set_name(dev, "%s", net->name);
 851
 852 #ifdef CONFIG_SYSFS
 853         /* Allow for a device specific group */
 854         if (*groups)
 855                 groups++;
 856
 857         *groups++ = &netstat_group;
 858 #ifdef CONFIG_WIRELESS_EXT_SYSFS
 859         if (net->ieee80211_ptr)
 860                 *groups++ = &wireless_group;
 861 #ifdef CONFIG_WIRELESS_EXT
 862         else if (net->wireless_handlers)
 863                 *groups++ = &wireless_group;
 864 #endif
 865 #endif
 866 #endif /* CONFIG_SYSFS */
 867
 868         if (!net_eq(dev_net(net), &init_net))
 869                 return 0;
 870
 871         error = device_add(dev);
 872         if (error)
 873                 return error;
 874
 875 #ifdef CONFIG_RPS
 876         error = rx_queue_register_kobjects(net);
 877         if (error) {
 878                 device_del(dev);
 879                 return error;
 880         }
 881 #endif
 882
 883         return error;
 884 }
 885
 886 int netdev_class_create_file(struct class_attribute *class_attr)
 887 {
 888         return class_create_file(&net_class, class_attr);
 889 }
 890
 891 void netdev_class_remove_file(struct class_attribute *class_attr)
 892 {
 893         class_remove_file(&net_class, class_attr);
 894 }
 895
 896 EXPORT_SYMBOL(netdev_class_create_file);
 897 EXPORT_SYMBOL(netdev_class_remove_file);
 898
 899 void netdev_initialize_kobject(struct net_device *net)
 900 {
 901         struct device *device = &(net->dev);
 902         device_initialize(device);
 903 }
 904
 905 int netdev_kobject_init(void)
 906 {
 907         return class_register(&net_class);
 908 }