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 <net/wext.h>
  24
  25 #include "net-sysfs.h"
  26
  27 #ifdef CONFIG_SYSFS
  28 static const char fmt_hex[] = "%#x\n";
  29 static const char fmt_long_hex[] = "%#lx\n";
  30 static const char fmt_dec[] = "%d\n";
  31 static const char fmt_udec[] = "%u\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 *net = to_net_dev(dev);
  46         ssize_t ret = -EINVAL;
  47
  48         read_lock(&dev_base_lock);
  49         if (dev_isalive(net))
  50                 ret = (*format)(net, 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 *net, char *buf)  \
  59 {                                                                       \
  60         return sprintf(buf, format_string, net->field);                 \
  61 }                                                                       \
  62 static ssize_t show_##field(struct device *dev,                         \
  63                             struct device_attribute *attr, char *buf)   \
  64 {                                                                       \
  65         return netdev_show(dev, attr, buf, format_##field);             \
  66 }
  67
  68
  69 /* use same locking and permission rules as SIF* ioctl's */
  70 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  71                             const char *buf, size_t len,
  72                             int (*set)(struct net_device *, unsigned long))
  73 {
  74         struct net_device *net = to_net_dev(dev);
  75         char *endp;
  76         unsigned long new;
  77         int ret = -EINVAL;
  78
  79         if (!capable(CAP_NET_ADMIN))
  80                 return -EPERM;
  81
  82         new = simple_strtoul(buf, &endp, 0);
  83         if (endp == buf)
  84                 goto err;
  85
  86         if (!rtnl_trylock())
  87                 return restart_syscall();
  88
  89         if (dev_isalive(net)) {
  90                 if ((ret = (*set)(net, new)) == 0)
  91                         ret = len;
  92         }
  93         rtnl_unlock();
  94  err:
  95         return ret;
  96 }
  97
  98 NETDEVICE_SHOW(dev_id, fmt_hex);
  99 NETDEVICE_SHOW(addr_assign_type, fmt_dec);
 100 NETDEVICE_SHOW(addr_len, fmt_dec);
 101 NETDEVICE_SHOW(iflink, fmt_dec);
 102 NETDEVICE_SHOW(ifindex, fmt_dec);
 103 NETDEVICE_SHOW(features, fmt_hex);
 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 (!dev_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 (!dev_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) 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(features, S_IRUGO, show_features, NULL),
 316         __ATTR(type, S_IRUGO, show_type, NULL),
 317         __ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
 318         __ATTR(address, S_IRUGO, show_address, NULL),
 319         __ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
 320         __ATTR(carrier, S_IRUGO, show_carrier, NULL),
 321         __ATTR(speed, S_IRUGO, show_speed, NULL),
 322         __ATTR(duplex, S_IRUGO, show_duplex, NULL),
 323         __ATTR(dormant, S_IRUGO, show_dormant, NULL),
 324         __ATTR(operstate, S_IRUGO, show_operstate, NULL),
 325         __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
 326         __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
 327         __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
 328                store_tx_queue_len),
 329         __ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
 330         {}
 331 };
 332
 333 /* Show a given an attribute in the statistics group */
 334 static ssize_t netstat_show(const struct device *d,
 335                             struct device_attribute *attr, char *buf,
 336                             unsigned long offset)
 337 {
 338         struct net_device *dev = to_net_dev(d);
 339         ssize_t ret = -EINVAL;
 340
 341         WARN_ON(offset > sizeof(struct rtnl_link_stats64) ||
 342                         offset % sizeof(u64) != 0);
 343
 344         read_lock(&dev_base_lock);
 345         if (dev_isalive(dev)) {
 346                 struct rtnl_link_stats64 temp;
 347                 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 348
 349                 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset));
 350         }
 351         read_unlock(&dev_base_lock);
 352         return ret;
 353 }
 354
 355 /* generate a read-only statistics attribute */
 356 #define NETSTAT_ENTRY(name)                                             \
 357 static ssize_t show_##name(struct device *d,                            \
 358                            struct device_attribute *attr, char *buf)    \
 359 {                                                                       \
 360         return netstat_show(d, attr, buf,                               \
 361                             offsetof(struct rtnl_link_stats64, name));  \
 362 }                                                                       \
 363 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
 364
 365 NETSTAT_ENTRY(rx_packets);
 366 NETSTAT_ENTRY(tx_packets);
 367 NETSTAT_ENTRY(rx_bytes);
 368 NETSTAT_ENTRY(tx_bytes);
 369 NETSTAT_ENTRY(rx_errors);
 370 NETSTAT_ENTRY(tx_errors);
 371 NETSTAT_ENTRY(rx_dropped);
 372 NETSTAT_ENTRY(tx_dropped);
 373 NETSTAT_ENTRY(multicast);
 374 NETSTAT_ENTRY(collisions);
 375 NETSTAT_ENTRY(rx_length_errors);
 376 NETSTAT_ENTRY(rx_over_errors);
 377 NETSTAT_ENTRY(rx_crc_errors);
 378 NETSTAT_ENTRY(rx_frame_errors);
 379 NETSTAT_ENTRY(rx_fifo_errors);
 380 NETSTAT_ENTRY(rx_missed_errors);
 381 NETSTAT_ENTRY(tx_aborted_errors);
 382 NETSTAT_ENTRY(tx_carrier_errors);
 383 NETSTAT_ENTRY(tx_fifo_errors);
 384 NETSTAT_ENTRY(tx_heartbeat_errors);
 385 NETSTAT_ENTRY(tx_window_errors);
 386 NETSTAT_ENTRY(rx_compressed);
 387 NETSTAT_ENTRY(tx_compressed);
 388
 389 static struct attribute *netstat_attrs[] = {
 390         &dev_attr_rx_packets.attr,
 391         &dev_attr_tx_packets.attr,
 392         &dev_attr_rx_bytes.attr,
 393         &dev_attr_tx_bytes.attr,
 394         &dev_attr_rx_errors.attr,
 395         &dev_attr_tx_errors.attr,
 396         &dev_attr_rx_dropped.attr,
 397         &dev_attr_tx_dropped.attr,
 398         &dev_attr_multicast.attr,
 399         &dev_attr_collisions.attr,
 400         &dev_attr_rx_length_errors.attr,
 401         &dev_attr_rx_over_errors.attr,
 402         &dev_attr_rx_crc_errors.attr,
 403         &dev_attr_rx_frame_errors.attr,
 404         &dev_attr_rx_fifo_errors.attr,
 405         &dev_attr_rx_missed_errors.attr,
 406         &dev_attr_tx_aborted_errors.attr,
 407         &dev_attr_tx_carrier_errors.attr,
 408         &dev_attr_tx_fifo_errors.attr,
 409         &dev_attr_tx_heartbeat_errors.attr,
 410         &dev_attr_tx_window_errors.attr,
 411         &dev_attr_rx_compressed.attr,
 412         &dev_attr_tx_compressed.attr,
 413         NULL
 414 };
 415
 416
 417 static struct attribute_group netstat_group = {
 418         .name  = "statistics",
 419         .attrs  = netstat_attrs,
 420 };
 421
 422 #ifdef CONFIG_WIRELESS_EXT_SYSFS
 423 /* helper function that does all the locking etc for wireless stats */
 424 static ssize_t wireless_show(struct device *d, char *buf,
 425                              ssize_t (*format)(const struct iw_statistics *,
 426                                                char *))
 427 {
 428         struct net_device *dev = to_net_dev(d);
 429         const struct iw_statistics *iw;
 430         ssize_t ret = -EINVAL;
 431
 432         if (!rtnl_trylock())
 433                 return restart_syscall();
 434         if (dev_isalive(dev)) {
 435                 iw = get_wireless_stats(dev);
 436                 if (iw)
 437                         ret = (*format)(iw, buf);
 438         }
 439         rtnl_unlock();
 440
 441         return ret;
 442 }
 443
 444 /* show function template for wireless fields */
 445 #define WIRELESS_SHOW(name, field, format_string)                       \
 446 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
 447 {                                                                       \
 448         return sprintf(buf, format_string, iw->field);                  \
 449 }                                                                       \
 450 static ssize_t show_iw_##name(struct device *d,                         \
 451                               struct device_attribute *attr, char *buf) \
 452 {                                                                       \
 453         return wireless_show(d, buf, format_iw_##name);                 \
 454 }                                                                       \
 455 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
 456
 457 WIRELESS_SHOW(status, status, fmt_hex);
 458 WIRELESS_SHOW(link, qual.qual, fmt_dec);
 459 WIRELESS_SHOW(level, qual.level, fmt_dec);
 460 WIRELESS_SHOW(noise, qual.noise, fmt_dec);
 461 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
 462 WIRELESS_SHOW(crypt, discard.code, fmt_dec);
 463 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
 464 WIRELESS_SHOW(misc, discard.misc, fmt_dec);
 465 WIRELESS_SHOW(retries, discard.retries, fmt_dec);
 466 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
 467
 468 static struct attribute *wireless_attrs[] = {
 469         &dev_attr_status.attr,
 470         &dev_attr_link.attr,
 471         &dev_attr_level.attr,
 472         &dev_attr_noise.attr,
 473         &dev_attr_nwid.attr,
 474         &dev_attr_crypt.attr,
 475         &dev_attr_fragment.attr,
 476         &dev_attr_retries.attr,
 477         &dev_attr_misc.attr,
 478         &dev_attr_beacon.attr,
 479         NULL
 480 };
 481
 482 static struct attribute_group wireless_group = {
 483         .name = "wireless",
 484         .attrs = wireless_attrs,
 485 };
 486 #endif
 487 #endif /* CONFIG_SYSFS */
 488
 489 #ifdef CONFIG_RPS
 490 /*
 491  * RX queue sysfs structures and functions.
 492  */
 493 struct rx_queue_attribute {
 494         struct attribute attr;
 495         ssize_t (*show)(struct netdev_rx_queue *queue,
 496             struct rx_queue_attribute *attr, char *buf);
 497         ssize_t (*store)(struct netdev_rx_queue *queue,
 498             struct rx_queue_attribute *attr, const char *buf, size_t len);
 499 };
 500 #define to_rx_queue_attr(_attr) container_of(_attr,             \
 501     struct rx_queue_attribute, attr)
 502
 503 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
 504
 505 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
 506                                   char *buf)
 507 {
 508         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 509         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 510
 511         if (!attribute->show)
 512                 return -EIO;
 513
 514         return attribute->show(queue, attribute, buf);
 515 }
 516
 517 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
 518                                    const char *buf, size_t count)
 519 {
 520         struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
 521         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 522
 523         if (!attribute->store)
 524                 return -EIO;
 525
 526         return attribute->store(queue, attribute, buf, count);
 527 }
 528
 529 static const struct sysfs_ops rx_queue_sysfs_ops = {
 530         .show = rx_queue_attr_show,
 531         .store = rx_queue_attr_store,
 532 };
 533
 534 static ssize_t show_rps_map(struct netdev_rx_queue *queue,
 535                             struct rx_queue_attribute *attribute, char *buf)
 536 {
 537         struct rps_map *map;
 538         cpumask_var_t mask;
 539         size_t len = 0;
 540         int i;
 541
 542         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 543                 return -ENOMEM;
 544
 545         rcu_read_lock();
 546         map = rcu_dereference(queue->rps_map);
 547         if (map)
 548                 for (i = 0; i < map->len; i++)
 549                         cpumask_set_cpu(map->cpus[i], mask);
 550
 551         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 552         if (PAGE_SIZE - len < 3) {
 553                 rcu_read_unlock();
 554                 free_cpumask_var(mask);
 555                 return -EINVAL;
 556         }
 557         rcu_read_unlock();
 558
 559         free_cpumask_var(mask);
 560         len += sprintf(buf + len, "\n");
 561         return len;
 562 }
 563
 564 static ssize_t store_rps_map(struct netdev_rx_queue *queue,
 565                       struct rx_queue_attribute *attribute,
 566                       const char *buf, size_t len)
 567 {
 568         struct rps_map *old_map, *map;
 569         cpumask_var_t mask;
 570         int err, cpu, i;
 571         static DEFINE_SPINLOCK(rps_map_lock);
 572
 573         if (!capable(CAP_NET_ADMIN))
 574                 return -EPERM;
 575
 576         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 577                 return -ENOMEM;
 578
 579         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 580         if (err) {
 581                 free_cpumask_var(mask);
 582                 return err;
 583         }
 584
 585         map = kzalloc(max_t(unsigned,
 586             RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
 587             GFP_KERNEL);
 588         if (!map) {
 589                 free_cpumask_var(mask);
 590                 return -ENOMEM;
 591         }
 592
 593         i = 0;
 594         for_each_cpu_and(cpu, mask, cpu_online_mask)
 595                 map->cpus[i++] = cpu;
 596
 597         if (i)
 598                 map->len = i;
 599         else {
 600                 kfree(map);
 601                 map = NULL;
 602         }
 603
 604         spin_lock(&rps_map_lock);
 605         old_map = rcu_dereference_protected(queue->rps_map,
 606                                             lockdep_is_held(&rps_map_lock));
 607         rcu_assign_pointer(queue->rps_map, map);
 608         spin_unlock(&rps_map_lock);
 609
 610         if (old_map)
 611                 kfree_rcu(old_map, rcu);
 612
 613         free_cpumask_var(mask);
 614         return len;
 615 }
 616
 617 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 618                                            struct rx_queue_attribute *attr,
 619                                            char *buf)
 620 {
 621         struct rps_dev_flow_table *flow_table;
 622         unsigned int val = 0;
 623
 624         rcu_read_lock();
 625         flow_table = rcu_dereference(queue->rps_flow_table);
 626         if (flow_table)
 627                 val = flow_table->mask + 1;
 628         rcu_read_unlock();
 629
 630         return sprintf(buf, "%u\n", val);
 631 }
 632
 633 static void rps_dev_flow_table_release_work(struct work_struct *work)
 634 {
 635         struct rps_dev_flow_table *table = container_of(work,
 636             struct rps_dev_flow_table, free_work);
 637
 638         vfree(table);
 639 }
 640
 641 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 642 {
 643         struct rps_dev_flow_table *table = container_of(rcu,
 644             struct rps_dev_flow_table, rcu);
 645
 646         INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
 647         schedule_work(&table->free_work);
 648 }
 649
 650 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 651                                      struct rx_queue_attribute *attr,
 652                                      const char *buf, size_t len)
 653 {
 654         unsigned int count;
 655         char *endp;
 656         struct rps_dev_flow_table *table, *old_table;
 657         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 658
 659         if (!capable(CAP_NET_ADMIN))
 660                 return -EPERM;
 661
 662         count = simple_strtoul(buf, &endp, 0);
 663         if (endp == buf)
 664                 return -EINVAL;
 665
 666         if (count) {
 667                 int i;
 668
 669                 if (count > 1<<30) {
 670                         /* Enforce a limit to prevent overflow */
 671                         return -EINVAL;
 672                 }
 673                 count = roundup_pow_of_two(count);
 674                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
 675                 if (!table)
 676                         return -ENOMEM;
 677
 678                 table->mask = count - 1;
 679                 for (i = 0; i < count; i++)
 680                         table->flows[i].cpu = RPS_NO_CPU;
 681         } else
 682                 table = NULL;
 683
 684         spin_lock(&rps_dev_flow_lock);
 685         old_table = rcu_dereference_protected(queue->rps_flow_table,
 686                                               lockdep_is_held(&rps_dev_flow_lock));
 687         rcu_assign_pointer(queue->rps_flow_table, table);
 688         spin_unlock(&rps_dev_flow_lock);
 689
 690         if (old_table)
 691                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 692
 693         return len;
 694 }
 695
 696 static struct rx_queue_attribute rps_cpus_attribute =
 697         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 698
 699
 700 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 701         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 702             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 703
 704 static struct attribute *rx_queue_default_attrs[] = {
 705         &rps_cpus_attribute.attr,
 706         &rps_dev_flow_table_cnt_attribute.attr,
 707         NULL
 708 };
 709
 710 static void rx_queue_release(struct kobject *kobj)
 711 {
 712         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 713         struct rps_map *map;
 714         struct rps_dev_flow_table *flow_table;
 715
 716
 717         map = rcu_dereference_raw(queue->rps_map);
 718         if (map) {
 719                 RCU_INIT_POINTER(queue->rps_map, NULL);
 720                 kfree_rcu(map, rcu);
 721         }
 722
 723         flow_table = rcu_dereference_raw(queue->rps_flow_table);
 724         if (flow_table) {
 725                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 726                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 727         }
 728
 729         memset(kobj, 0, sizeof(*kobj));
 730         dev_put(queue->dev);
 731 }
 732
 733 static struct kobj_type rx_queue_ktype = {
 734         .sysfs_ops = &rx_queue_sysfs_ops,
 735         .release = rx_queue_release,
 736         .default_attrs = rx_queue_default_attrs,
 737 };
 738
 739 static int rx_queue_add_kobject(struct net_device *net, int index)
 740 {
 741         struct netdev_rx_queue *queue = net->_rx + index;
 742         struct kobject *kobj = &queue->kobj;
 743         int error = 0;
 744
 745         kobj->kset = net->queues_kset;
 746         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 747             "rx-%u", index);
 748         if (error) {
 749                 kobject_put(kobj);
 750                 return error;
 751         }
 752
 753         kobject_uevent(kobj, KOBJ_ADD);
 754         dev_hold(queue->dev);
 755
 756         return error;
 757 }
 758 #endif /* CONFIG_RPS */
 759
 760 int
 761 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
 762 {
 763 #ifdef CONFIG_RPS
 764         int i;
 765         int error = 0;
 766
 767         for (i = old_num; i < new_num; i++) {
 768                 error = rx_queue_add_kobject(net, i);
 769                 if (error) {
 770                         new_num = old_num;
 771                         break;
 772                 }
 773         }
 774
 775         while (--i >= new_num)
 776                 kobject_put(&net->_rx[i].kobj);
 777
 778         return error;
 779 #else
 780         return 0;
 781 #endif
 782 }
 783
 784 #ifdef CONFIG_XPS
 785 /*
 786  * netdev_queue sysfs structures and functions.
 787  */
 788 struct netdev_queue_attribute {
 789         struct attribute attr;
 790         ssize_t (*show)(struct netdev_queue *queue,
 791             struct netdev_queue_attribute *attr, char *buf);
 792         ssize_t (*store)(struct netdev_queue *queue,
 793             struct netdev_queue_attribute *attr, const char *buf, size_t len);
 794 };
 795 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
 796     struct netdev_queue_attribute, attr)
 797
 798 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 799
 800 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 801                                       struct attribute *attr, char *buf)
 802 {
 803         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 804         struct netdev_queue *queue = to_netdev_queue(kobj);
 805
 806         if (!attribute->show)
 807                 return -EIO;
 808
 809         return attribute->show(queue, attribute, buf);
 810 }
 811
 812 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 813                                        struct attribute *attr,
 814                                        const char *buf, size_t count)
 815 {
 816         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 817         struct netdev_queue *queue = to_netdev_queue(kobj);
 818
 819         if (!attribute->store)
 820                 return -EIO;
 821
 822         return attribute->store(queue, attribute, buf, count);
 823 }
 824
 825 static const struct sysfs_ops netdev_queue_sysfs_ops = {
 826         .show = netdev_queue_attr_show,
 827         .store = netdev_queue_attr_store,
 828 };
 829
 830 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
 831 {
 832         struct net_device *dev = queue->dev;
 833         int i;
 834
 835         for (i = 0; i < dev->num_tx_queues; i++)
 836                 if (queue == &dev->_tx[i])
 837                         break;
 838
 839         BUG_ON(i >= dev->num_tx_queues);
 840
 841         return i;
 842 }
 843
 844
 845 static ssize_t show_xps_map(struct netdev_queue *queue,
 846                             struct netdev_queue_attribute *attribute, char *buf)
 847 {
 848         struct net_device *dev = queue->dev;
 849         struct xps_dev_maps *dev_maps;
 850         cpumask_var_t mask;
 851         unsigned long index;
 852         size_t len = 0;
 853         int i;
 854
 855         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 856                 return -ENOMEM;
 857
 858         index = get_netdev_queue_index(queue);
 859
 860         rcu_read_lock();
 861         dev_maps = rcu_dereference(dev->xps_maps);
 862         if (dev_maps) {
 863                 for_each_possible_cpu(i) {
 864                         struct xps_map *map =
 865                             rcu_dereference(dev_maps->cpu_map[i]);
 866                         if (map) {
 867                                 int j;
 868                                 for (j = 0; j < map->len; j++) {
 869                                         if (map->queues[j] == index) {
 870                                                 cpumask_set_cpu(i, mask);
 871                                                 break;
 872                                         }
 873                                 }
 874                         }
 875                 }
 876         }
 877         rcu_read_unlock();
 878
 879         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 880         if (PAGE_SIZE - len < 3) {
 881                 free_cpumask_var(mask);
 882                 return -EINVAL;
 883         }
 884
 885         free_cpumask_var(mask);
 886         len += sprintf(buf + len, "\n");
 887         return len;
 888 }
 889
 890 static DEFINE_MUTEX(xps_map_mutex);
 891 #define xmap_dereference(P)             \
 892         rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
 893
 894 static ssize_t store_xps_map(struct netdev_queue *queue,
 895                       struct netdev_queue_attribute *attribute,
 896                       const char *buf, size_t len)
 897 {
 898         struct net_device *dev = queue->dev;
 899         cpumask_var_t mask;
 900         int err, i, cpu, pos, map_len, alloc_len, need_set;
 901         unsigned long index;
 902         struct xps_map *map, *new_map;
 903         struct xps_dev_maps *dev_maps, *new_dev_maps;
 904         int nonempty = 0;
 905         int numa_node = -2;
 906
 907         if (!capable(CAP_NET_ADMIN))
 908                 return -EPERM;
 909
 910         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 911                 return -ENOMEM;
 912
 913         index = get_netdev_queue_index(queue);
 914
 915         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 916         if (err) {
 917                 free_cpumask_var(mask);
 918                 return err;
 919         }
 920
 921         new_dev_maps = kzalloc(max_t(unsigned,
 922             XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
 923         if (!new_dev_maps) {
 924                 free_cpumask_var(mask);
 925                 return -ENOMEM;
 926         }
 927
 928         mutex_lock(&xps_map_mutex);
 929
 930         dev_maps = xmap_dereference(dev->xps_maps);
 931
 932         for_each_possible_cpu(cpu) {
 933                 map = dev_maps ?
 934                         xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
 935                 new_map = map;
 936                 if (map) {
 937                         for (pos = 0; pos < map->len; pos++)
 938                                 if (map->queues[pos] == index)
 939                                         break;
 940                         map_len = map->len;
 941                         alloc_len = map->alloc_len;
 942                 } else
 943                         pos = map_len = alloc_len = 0;
 944
 945                 need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);
 946 #ifdef CONFIG_NUMA
 947                 if (need_set) {
 948                         if (numa_node == -2)
 949                                 numa_node = cpu_to_node(cpu);
 950                         else if (numa_node != cpu_to_node(cpu))
 951                                 numa_node = -1;
 952                 }
 953 #endif
 954                 if (need_set && pos >= map_len) {
 955                         /* Need to add queue to this CPU's map */
 956                         if (map_len >= alloc_len) {
 957                                 alloc_len = alloc_len ?
 958                                     2 * alloc_len : XPS_MIN_MAP_ALLOC;
 959                                 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
 960                                                        GFP_KERNEL,
 961                                                        cpu_to_node(cpu));
 962                                 if (!new_map)
 963                                         goto error;
 964                                 new_map->alloc_len = alloc_len;
 965                                 for (i = 0; i < map_len; i++)
 966                                         new_map->queues[i] = map->queues[i];
 967                                 new_map->len = map_len;
 968                         }
 969                         new_map->queues[new_map->len++] = index;
 970                 } else if (!need_set && pos < map_len) {
 971                         /* Need to remove queue from this CPU's map */
 972                         if (map_len > 1)
 973                                 new_map->queues[pos] =
 974                                     new_map->queues[--new_map->len];
 975                         else
 976                                 new_map = NULL;
 977                 }
 978                 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
 979         }
 980
 981         /* Cleanup old maps */
 982         for_each_possible_cpu(cpu) {
 983                 map = dev_maps ?
 984                         xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
 985                 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
 986                         kfree_rcu(map, rcu);
 987                 if (new_dev_maps->cpu_map[cpu])
 988                         nonempty = 1;
 989         }
 990
 991         if (nonempty)
 992                 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
 993         else {
 994                 kfree(new_dev_maps);
 995                 rcu_assign_pointer(dev->xps_maps, NULL);
 996         }
 997
 998         if (dev_maps)
 999                 kfree_rcu(dev_maps, rcu);
1000
1001         netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node :
1002                                             NUMA_NO_NODE);
1003
1004         mutex_unlock(&xps_map_mutex);
1005
1006         free_cpumask_var(mask);
1007         return len;
1008
1009 error:
1010         mutex_unlock(&xps_map_mutex);
1011
1012         if (new_dev_maps)
1013                 for_each_possible_cpu(i)
1014                         kfree(rcu_dereference_protected(
1015                                 new_dev_maps->cpu_map[i],
1016                                 1));
1017         kfree(new_dev_maps);
1018         free_cpumask_var(mask);
1019         return -ENOMEM;
1020 }
1021
1022 static struct netdev_queue_attribute xps_cpus_attribute =
1023     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1024
1025 static struct attribute *netdev_queue_default_attrs[] = {
1026         &xps_cpus_attribute.attr,
1027         NULL
1028 };
1029
1030 static void netdev_queue_release(struct kobject *kobj)
1031 {
1032         struct netdev_queue *queue = to_netdev_queue(kobj);
1033         struct net_device *dev = queue->dev;
1034         struct xps_dev_maps *dev_maps;
1035         struct xps_map *map;
1036         unsigned long index;
1037         int i, pos, nonempty = 0;
1038
1039         index = get_netdev_queue_index(queue);
1040
1041         mutex_lock(&xps_map_mutex);
1042         dev_maps = xmap_dereference(dev->xps_maps);
1043
1044         if (dev_maps) {
1045                 for_each_possible_cpu(i) {
1046                         map = xmap_dereference(dev_maps->cpu_map[i]);
1047                         if (!map)
1048                                 continue;
1049
1050                         for (pos = 0; pos < map->len; pos++)
1051                                 if (map->queues[pos] == index)
1052                                         break;
1053
1054                         if (pos < map->len) {
1055                                 if (map->len > 1)
1056                                         map->queues[pos] =
1057                                             map->queues[--map->len];
1058                                 else {
1059                                         RCU_INIT_POINTER(dev_maps->cpu_map[i],
1060                                             NULL);
1061                                         kfree_rcu(map, rcu);
1062                                         map = NULL;
1063                                 }
1064                         }
1065                         if (map)
1066                                 nonempty = 1;
1067                 }
1068
1069                 if (!nonempty) {
1070                         RCU_INIT_POINTER(dev->xps_maps, NULL);
1071                         kfree_rcu(dev_maps, rcu);
1072                 }
1073         }
1074
1075         mutex_unlock(&xps_map_mutex);
1076
1077         memset(kobj, 0, sizeof(*kobj));
1078         dev_put(queue->dev);
1079 }
1080
1081 static struct kobj_type netdev_queue_ktype = {
1082         .sysfs_ops = &netdev_queue_sysfs_ops,
1083         .release = netdev_queue_release,
1084         .default_attrs = netdev_queue_default_attrs,
1085 };
1086
1087 static int netdev_queue_add_kobject(struct net_device *net, int index)
1088 {
1089         struct netdev_queue *queue = net->_tx + index;
1090         struct kobject *kobj = &queue->kobj;
1091         int error = 0;
1092
1093         kobj->kset = net->queues_kset;
1094         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1095             "tx-%u", index);
1096         if (error) {
1097                 kobject_put(kobj);
1098                 return error;
1099         }
1100
1101         kobject_uevent(kobj, KOBJ_ADD);
1102         dev_hold(queue->dev);
1103
1104         return error;
1105 }
1106 #endif /* CONFIG_XPS */
1107
1108 int
1109 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1110 {
1111 #ifdef CONFIG_XPS
1112         int i;
1113         int error = 0;
1114
1115         for (i = old_num; i < new_num; i++) {
1116                 error = netdev_queue_add_kobject(net, i);
1117                 if (error) {
1118                         new_num = old_num;
1119                         break;
1120                 }
1121         }
1122
1123         while (--i >= new_num)
1124                 kobject_put(&net->_tx[i].kobj);
1125
1126         return error;
1127 #else
1128         return 0;
1129 #endif
1130 }
1131
1132 static int register_queue_kobjects(struct net_device *net)
1133 {
1134         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1135
1136 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1137         net->queues_kset = kset_create_and_add("queues",
1138             NULL, &net->dev.kobj);
1139         if (!net->queues_kset)
1140                 return -ENOMEM;
1141 #endif
1142
1143 #ifdef CONFIG_RPS
1144         real_rx = net->real_num_rx_queues;
1145 #endif
1146         real_tx = net->real_num_tx_queues;
1147
1148         error = net_rx_queue_update_kobjects(net, 0, real_rx);
1149         if (error)
1150                 goto error;
1151         rxq = real_rx;
1152
1153         error = netdev_queue_update_kobjects(net, 0, real_tx);
1154         if (error)
1155                 goto error;
1156         txq = real_tx;
1157
1158         return 0;
1159
1160 error:
1161         netdev_queue_update_kobjects(net, txq, 0);
1162         net_rx_queue_update_kobjects(net, rxq, 0);
1163         return error;
1164 }
1165
1166 static void remove_queue_kobjects(struct net_device *net)
1167 {
1168         int real_rx = 0, real_tx = 0;
1169
1170 #ifdef CONFIG_RPS
1171         real_rx = net->real_num_rx_queues;
1172 #endif
1173         real_tx = net->real_num_tx_queues;
1174
1175         net_rx_queue_update_kobjects(net, real_rx, 0);
1176         netdev_queue_update_kobjects(net, real_tx, 0);
1177 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1178         kset_unregister(net->queues_kset);
1179 #endif
1180 }
1181
1182 static void *net_grab_current_ns(void)
1183 {
1184         struct net *ns = current->nsproxy->net_ns;
1185 #ifdef CONFIG_NET_NS
1186         if (ns)
1187                 atomic_inc(&ns->passive);
1188 #endif
1189         return ns;
1190 }
1191
1192 static const void *net_initial_ns(void)
1193 {
1194         return &init_net;
1195 }
1196
1197 static const void *net_netlink_ns(struct sock *sk)
1198 {
1199         return sock_net(sk);
1200 }
1201
1202 struct kobj_ns_type_operations net_ns_type_operations = {
1203         .type = KOBJ_NS_TYPE_NET,
1204         .grab_current_ns = net_grab_current_ns,
1205         .netlink_ns = net_netlink_ns,
1206         .initial_ns = net_initial_ns,
1207         .drop_ns = net_drop_ns,
1208 };
1209 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1210
1211 #ifdef CONFIG_HOTPLUG
1212 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1213 {
1214         struct net_device *dev = to_net_dev(d);
1215         int retval;
1216
1217         /* pass interface to uevent. */
1218         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1219         if (retval)
1220                 goto exit;
1221
1222         /* pass ifindex to uevent.
1223          * ifindex is useful as it won't change (interface name may change)
1224          * and is what RtNetlink uses natively. */
1225         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1226
1227 exit:
1228         return retval;
1229 }
1230 #endif
1231
1232 /*
1233  *      netdev_release -- destroy and free a dead device.
1234  *      Called when last reference to device kobject is gone.
1235  */
1236 static void netdev_release(struct device *d)
1237 {
1238         struct net_device *dev = to_net_dev(d);
1239
1240         BUG_ON(dev->reg_state != NETREG_RELEASED);
1241
1242         kfree(dev->ifalias);
1243         kfree((char *)dev - dev->padded);
1244 }
1245
1246 static const void *net_namespace(struct device *d)
1247 {
1248         struct net_device *dev;
1249         dev = container_of(d, struct net_device, dev);
1250         return dev_net(dev);
1251 }
1252
1253 static struct class net_class = {
1254         .name = "net",
1255         .dev_release = netdev_release,
1256 #ifdef CONFIG_SYSFS
1257         .dev_attrs = net_class_attributes,
1258 #endif /* CONFIG_SYSFS */
1259 #ifdef CONFIG_HOTPLUG
1260         .dev_uevent = netdev_uevent,
1261 #endif
1262         .ns_type = &net_ns_type_operations,
1263         .namespace = net_namespace,
1264 };
1265
1266 /* Delete sysfs entries but hold kobject reference until after all
1267  * netdev references are gone.
1268  */
1269 void netdev_unregister_kobject(struct net_device * net)
1270 {
1271         struct device *dev = &(net->dev);
1272
1273         kobject_get(&dev->kobj);
1274
1275         remove_queue_kobjects(net);
1276
1277         device_del(dev);
1278 }
1279
1280 /* Create sysfs entries for network device. */
1281 int netdev_register_kobject(struct net_device *net)
1282 {
1283         struct device *dev = &(net->dev);
1284         const struct attribute_group **groups = net->sysfs_groups;
1285         int error = 0;
1286
1287         device_initialize(dev);
1288         dev->class = &net_class;
1289         dev->platform_data = net;
1290         dev->groups = groups;
1291
1292         dev_set_name(dev, "%s", net->name);
1293
1294 #ifdef CONFIG_SYSFS
1295         /* Allow for a device specific group */
1296         if (*groups)
1297                 groups++;
1298
1299         *groups++ = &netstat_group;
1300 #ifdef CONFIG_WIRELESS_EXT_SYSFS
1301         if (net->ieee80211_ptr)
1302                 *groups++ = &wireless_group;
1303 #ifdef CONFIG_WIRELESS_EXT
1304         else if (net->wireless_handlers)
1305                 *groups++ = &wireless_group;
1306 #endif
1307 #endif
1308 #endif /* CONFIG_SYSFS */
1309
1310         error = device_add(dev);
1311         if (error)
1312                 return error;
1313
1314         error = register_queue_kobjects(net);
1315         if (error) {
1316                 device_del(dev);
1317                 return error;
1318         }
1319
1320         return error;
1321 }
1322
1323 int netdev_class_create_file(struct class_attribute *class_attr)
1324 {
1325         return class_create_file(&net_class, class_attr);
1326 }
1327 EXPORT_SYMBOL(netdev_class_create_file);
1328
1329 void netdev_class_remove_file(struct class_attribute *class_attr)
1330 {
1331         class_remove_file(&net_class, class_attr);
1332 }
1333 EXPORT_SYMBOL(netdev_class_remove_file);
1334
1335 int netdev_kobject_init(void)
1336 {
1337         kobj_ns_type_register(&net_ns_type_operations);
1338         return class_register(&net_class);
1339 }