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 <net/wext.h>
  25
  26 #include "net-sysfs.h"
  27
  28 #ifdef CONFIG_SYSFS
  29 static const char fmt_hex[] = "%#x\n";
  30 static const char fmt_long_hex[] = "%#lx\n";
  31 static const char fmt_dec[] = "%d\n";
  32 static const char fmt_udec[] = "%u\n";
  33 static const char fmt_ulong[] = "%lu\n";
  34 static const char fmt_u64[] = "%llu\n";
  35
  36 static inline int dev_isalive(const struct net_device *dev)
  37 {
  38         return dev->reg_state <= NETREG_REGISTERED;
  39 }
  40
  41 /* use same locking rules as GIF* ioctl's */
  42 static ssize_t netdev_show(const struct device *dev,
  43                            struct device_attribute *attr, char *buf,
  44                            ssize_t (*format)(const struct net_device *, char *))
  45 {
  46         struct net_device *net = to_net_dev(dev);
  47         ssize_t ret = -EINVAL;
  48
  49         read_lock(&dev_base_lock);
  50         if (dev_isalive(net))
  51                 ret = (*format)(net, buf);
  52         read_unlock(&dev_base_lock);
  53
  54         return ret;
  55 }
  56
  57 /* generate a show function for simple field */
  58 #define NETDEVICE_SHOW(field, format_string)                            \
  59 static ssize_t format_##field(const struct net_device *net, char *buf)  \
  60 {                                                                       \
  61         return sprintf(buf, format_string, net->field);                 \
  62 }                                                                       \
  63 static ssize_t show_##field(struct device *dev,                         \
  64                             struct device_attribute *attr, char *buf)   \
  65 {                                                                       \
  66         return netdev_show(dev, attr, buf, format_##field);             \
  67 }
  68
  69
  70 /* use same locking and permission rules as SIF* ioctl's */
  71 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
  72                             const char *buf, size_t len,
  73                             int (*set)(struct net_device *, unsigned long))
  74 {
  75         struct net_device *net = to_net_dev(dev);
  76         char *endp;
  77         unsigned long new;
  78         int ret = -EINVAL;
  79
  80         if (!capable(CAP_NET_ADMIN))
  81                 return -EPERM;
  82
  83         new = simple_strtoul(buf, &endp, 0);
  84         if (endp == buf)
  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) 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,
 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 (old_map)
 610                 kfree_rcu(old_map, rcu);
 611
 612         free_cpumask_var(mask);
 613         return len;
 614 }
 615
 616 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 617                                            struct rx_queue_attribute *attr,
 618                                            char *buf)
 619 {
 620         struct rps_dev_flow_table *flow_table;
 621         unsigned int val = 0;
 622
 623         rcu_read_lock();
 624         flow_table = rcu_dereference(queue->rps_flow_table);
 625         if (flow_table)
 626                 val = flow_table->mask + 1;
 627         rcu_read_unlock();
 628
 629         return sprintf(buf, "%u\n", val);
 630 }
 631
 632 static void rps_dev_flow_table_release_work(struct work_struct *work)
 633 {
 634         struct rps_dev_flow_table *table = container_of(work,
 635             struct rps_dev_flow_table, free_work);
 636
 637         vfree(table);
 638 }
 639
 640 static void rps_dev_flow_table_release(struct rcu_head *rcu)
 641 {
 642         struct rps_dev_flow_table *table = container_of(rcu,
 643             struct rps_dev_flow_table, rcu);
 644
 645         INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
 646         schedule_work(&table->free_work);
 647 }
 648
 649 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
 650                                      struct rx_queue_attribute *attr,
 651                                      const char *buf, size_t len)
 652 {
 653         unsigned int count;
 654         char *endp;
 655         struct rps_dev_flow_table *table, *old_table;
 656         static DEFINE_SPINLOCK(rps_dev_flow_lock);
 657
 658         if (!capable(CAP_NET_ADMIN))
 659                 return -EPERM;
 660
 661         count = simple_strtoul(buf, &endp, 0);
 662         if (endp == buf)
 663                 return -EINVAL;
 664
 665         if (count) {
 666                 int i;
 667
 668                 if (count > 1<<30) {
 669                         /* Enforce a limit to prevent overflow */
 670                         return -EINVAL;
 671                 }
 672                 count = roundup_pow_of_two(count);
 673                 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count));
 674                 if (!table)
 675                         return -ENOMEM;
 676
 677                 table->mask = count - 1;
 678                 for (i = 0; i < count; i++)
 679                         table->flows[i].cpu = RPS_NO_CPU;
 680         } else
 681                 table = NULL;
 682
 683         spin_lock(&rps_dev_flow_lock);
 684         old_table = rcu_dereference_protected(queue->rps_flow_table,
 685                                               lockdep_is_held(&rps_dev_flow_lock));
 686         rcu_assign_pointer(queue->rps_flow_table, table);
 687         spin_unlock(&rps_dev_flow_lock);
 688
 689         if (old_table)
 690                 call_rcu(&old_table->rcu, rps_dev_flow_table_release);
 691
 692         return len;
 693 }
 694
 695 static struct rx_queue_attribute rps_cpus_attribute =
 696         __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
 697
 698
 699 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
 700         __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
 701             show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
 702
 703 static struct attribute *rx_queue_default_attrs[] = {
 704         &rps_cpus_attribute.attr,
 705         &rps_dev_flow_table_cnt_attribute.attr,
 706         NULL
 707 };
 708
 709 static void rx_queue_release(struct kobject *kobj)
 710 {
 711         struct netdev_rx_queue *queue = to_rx_queue(kobj);
 712         struct rps_map *map;
 713         struct rps_dev_flow_table *flow_table;
 714
 715
 716         map = rcu_dereference_protected(queue->rps_map, 1);
 717         if (map) {
 718                 RCU_INIT_POINTER(queue->rps_map, NULL);
 719                 kfree_rcu(map, rcu);
 720         }
 721
 722         flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
 723         if (flow_table) {
 724                 RCU_INIT_POINTER(queue->rps_flow_table, NULL);
 725                 call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
 726         }
 727
 728         memset(kobj, 0, sizeof(*kobj));
 729         dev_put(queue->dev);
 730 }
 731
 732 static struct kobj_type rx_queue_ktype = {
 733         .sysfs_ops = &rx_queue_sysfs_ops,
 734         .release = rx_queue_release,
 735         .default_attrs = rx_queue_default_attrs,
 736 };
 737
 738 static int rx_queue_add_kobject(struct net_device *net, int index)
 739 {
 740         struct netdev_rx_queue *queue = net->_rx + index;
 741         struct kobject *kobj = &queue->kobj;
 742         int error = 0;
 743
 744         kobj->kset = net->queues_kset;
 745         error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
 746             "rx-%u", index);
 747         if (error) {
 748                 kobject_put(kobj);
 749                 return error;
 750         }
 751
 752         kobject_uevent(kobj, KOBJ_ADD);
 753         dev_hold(queue->dev);
 754
 755         return error;
 756 }
 757 #endif /* CONFIG_RPS */
 758
 759 int
 760 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
 761 {
 762 #ifdef CONFIG_RPS
 763         int i;
 764         int error = 0;
 765
 766         for (i = old_num; i < new_num; i++) {
 767                 error = rx_queue_add_kobject(net, i);
 768                 if (error) {
 769                         new_num = old_num;
 770                         break;
 771                 }
 772         }
 773
 774         while (--i >= new_num)
 775                 kobject_put(&net->_rx[i].kobj);
 776
 777         return error;
 778 #else
 779         return 0;
 780 #endif
 781 }
 782
 783 #ifdef CONFIG_XPS
 784 /*
 785  * netdev_queue sysfs structures and functions.
 786  */
 787 struct netdev_queue_attribute {
 788         struct attribute attr;
 789         ssize_t (*show)(struct netdev_queue *queue,
 790             struct netdev_queue_attribute *attr, char *buf);
 791         ssize_t (*store)(struct netdev_queue *queue,
 792             struct netdev_queue_attribute *attr, const char *buf, size_t len);
 793 };
 794 #define to_netdev_queue_attr(_attr) container_of(_attr,         \
 795     struct netdev_queue_attribute, attr)
 796
 797 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
 798
 799 static ssize_t netdev_queue_attr_show(struct kobject *kobj,
 800                                       struct attribute *attr, char *buf)
 801 {
 802         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 803         struct netdev_queue *queue = to_netdev_queue(kobj);
 804
 805         if (!attribute->show)
 806                 return -EIO;
 807
 808         return attribute->show(queue, attribute, buf);
 809 }
 810
 811 static ssize_t netdev_queue_attr_store(struct kobject *kobj,
 812                                        struct attribute *attr,
 813                                        const char *buf, size_t count)
 814 {
 815         struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
 816         struct netdev_queue *queue = to_netdev_queue(kobj);
 817
 818         if (!attribute->store)
 819                 return -EIO;
 820
 821         return attribute->store(queue, attribute, buf, count);
 822 }
 823
 824 static const struct sysfs_ops netdev_queue_sysfs_ops = {
 825         .show = netdev_queue_attr_show,
 826         .store = netdev_queue_attr_store,
 827 };
 828
 829 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
 830 {
 831         struct net_device *dev = queue->dev;
 832         int i;
 833
 834         for (i = 0; i < dev->num_tx_queues; i++)
 835                 if (queue == &dev->_tx[i])
 836                         break;
 837
 838         BUG_ON(i >= dev->num_tx_queues);
 839
 840         return i;
 841 }
 842
 843
 844 static ssize_t show_xps_map(struct netdev_queue *queue,
 845                             struct netdev_queue_attribute *attribute, char *buf)
 846 {
 847         struct net_device *dev = queue->dev;
 848         struct xps_dev_maps *dev_maps;
 849         cpumask_var_t mask;
 850         unsigned long index;
 851         size_t len = 0;
 852         int i;
 853
 854         if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
 855                 return -ENOMEM;
 856
 857         index = get_netdev_queue_index(queue);
 858
 859         rcu_read_lock();
 860         dev_maps = rcu_dereference(dev->xps_maps);
 861         if (dev_maps) {
 862                 for_each_possible_cpu(i) {
 863                         struct xps_map *map =
 864                             rcu_dereference(dev_maps->cpu_map[i]);
 865                         if (map) {
 866                                 int j;
 867                                 for (j = 0; j < map->len; j++) {
 868                                         if (map->queues[j] == index) {
 869                                                 cpumask_set_cpu(i, mask);
 870                                                 break;
 871                                         }
 872                                 }
 873                         }
 874                 }
 875         }
 876         rcu_read_unlock();
 877
 878         len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
 879         if (PAGE_SIZE - len < 3) {
 880                 free_cpumask_var(mask);
 881                 return -EINVAL;
 882         }
 883
 884         free_cpumask_var(mask);
 885         len += sprintf(buf + len, "\n");
 886         return len;
 887 }
 888
 889 static DEFINE_MUTEX(xps_map_mutex);
 890 #define xmap_dereference(P)             \
 891         rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
 892
 893 static ssize_t store_xps_map(struct netdev_queue *queue,
 894                       struct netdev_queue_attribute *attribute,
 895                       const char *buf, size_t len)
 896 {
 897         struct net_device *dev = queue->dev;
 898         cpumask_var_t mask;
 899         int err, i, cpu, pos, map_len, alloc_len, need_set;
 900         unsigned long index;
 901         struct xps_map *map, *new_map;
 902         struct xps_dev_maps *dev_maps, *new_dev_maps;
 903         int nonempty = 0;
 904         int numa_node = -2;
 905
 906         if (!capable(CAP_NET_ADMIN))
 907                 return -EPERM;
 908
 909         if (!alloc_cpumask_var(&mask, GFP_KERNEL))
 910                 return -ENOMEM;
 911
 912         index = get_netdev_queue_index(queue);
 913
 914         err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
 915         if (err) {
 916                 free_cpumask_var(mask);
 917                 return err;
 918         }
 919
 920         new_dev_maps = kzalloc(max_t(unsigned,
 921             XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
 922         if (!new_dev_maps) {
 923                 free_cpumask_var(mask);
 924                 return -ENOMEM;
 925         }
 926
 927         mutex_lock(&xps_map_mutex);
 928
 929         dev_maps = xmap_dereference(dev->xps_maps);
 930
 931         for_each_possible_cpu(cpu) {
 932                 map = dev_maps ?
 933                         xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
 934                 new_map = map;
 935                 if (map) {
 936                         for (pos = 0; pos < map->len; pos++)
 937                                 if (map->queues[pos] == index)
 938                                         break;
 939                         map_len = map->len;
 940                         alloc_len = map->alloc_len;
 941                 } else
 942                         pos = map_len = alloc_len = 0;
 943
 944                 need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);
 945 #ifdef CONFIG_NUMA
 946                 if (need_set) {
 947                         if (numa_node == -2)
 948                                 numa_node = cpu_to_node(cpu);
 949                         else if (numa_node != cpu_to_node(cpu))
 950                                 numa_node = -1;
 951                 }
 952 #endif
 953                 if (need_set && pos >= map_len) {
 954                         /* Need to add queue to this CPU's map */
 955                         if (map_len >= alloc_len) {
 956                                 alloc_len = alloc_len ?
 957                                     2 * alloc_len : XPS_MIN_MAP_ALLOC;
 958                                 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
 959                                                        GFP_KERNEL,
 960                                                        cpu_to_node(cpu));
 961                                 if (!new_map)
 962                                         goto error;
 963                                 new_map->alloc_len = alloc_len;
 964                                 for (i = 0; i < map_len; i++)
 965                                         new_map->queues[i] = map->queues[i];
 966                                 new_map->len = map_len;
 967                         }
 968                         new_map->queues[new_map->len++] = index;
 969                 } else if (!need_set && pos < map_len) {
 970                         /* Need to remove queue from this CPU's map */
 971                         if (map_len > 1)
 972                                 new_map->queues[pos] =
 973                                     new_map->queues[--new_map->len];
 974                         else
 975                                 new_map = NULL;
 976                 }
 977                 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
 978         }
 979
 980         /* Cleanup old maps */
 981         for_each_possible_cpu(cpu) {
 982                 map = dev_maps ?
 983                         xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
 984                 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
 985                         kfree_rcu(map, rcu);
 986                 if (new_dev_maps->cpu_map[cpu])
 987                         nonempty = 1;
 988         }
 989
 990         if (nonempty)
 991                 RCU_INIT_POINTER(dev->xps_maps, new_dev_maps);
 992         else {
 993                 kfree(new_dev_maps);
 994                 RCU_INIT_POINTER(dev->xps_maps, NULL);
 995         }
 996
 997         if (dev_maps)
 998                 kfree_rcu(dev_maps, rcu);
 999
1000         netdev_queue_numa_node_write(queue, (numa_node >= 0) ? numa_node :
1001                                             NUMA_NO_NODE);
1002
1003         mutex_unlock(&xps_map_mutex);
1004
1005         free_cpumask_var(mask);
1006         return len;
1007
1008 error:
1009         mutex_unlock(&xps_map_mutex);
1010
1011         if (new_dev_maps)
1012                 for_each_possible_cpu(i)
1013                         kfree(rcu_dereference_protected(
1014                                 new_dev_maps->cpu_map[i],
1015                                 1));
1016         kfree(new_dev_maps);
1017         free_cpumask_var(mask);
1018         return -ENOMEM;
1019 }
1020
1021 static struct netdev_queue_attribute xps_cpus_attribute =
1022     __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
1023
1024 static struct attribute *netdev_queue_default_attrs[] = {
1025         &xps_cpus_attribute.attr,
1026         NULL
1027 };
1028
1029 static void netdev_queue_release(struct kobject *kobj)
1030 {
1031         struct netdev_queue *queue = to_netdev_queue(kobj);
1032         struct net_device *dev = queue->dev;
1033         struct xps_dev_maps *dev_maps;
1034         struct xps_map *map;
1035         unsigned long index;
1036         int i, pos, nonempty = 0;
1037
1038         index = get_netdev_queue_index(queue);
1039
1040         mutex_lock(&xps_map_mutex);
1041         dev_maps = xmap_dereference(dev->xps_maps);
1042
1043         if (dev_maps) {
1044                 for_each_possible_cpu(i) {
1045                         map = xmap_dereference(dev_maps->cpu_map[i]);
1046                         if (!map)
1047                                 continue;
1048
1049                         for (pos = 0; pos < map->len; pos++)
1050                                 if (map->queues[pos] == index)
1051                                         break;
1052
1053                         if (pos < map->len) {
1054                                 if (map->len > 1)
1055                                         map->queues[pos] =
1056                                             map->queues[--map->len];
1057                                 else {
1058                                         RCU_INIT_POINTER(dev_maps->cpu_map[i],
1059                                             NULL);
1060                                         kfree_rcu(map, rcu);
1061                                         map = NULL;
1062                                 }
1063                         }
1064                         if (map)
1065                                 nonempty = 1;
1066                 }
1067
1068                 if (!nonempty) {
1069                         RCU_INIT_POINTER(dev->xps_maps, NULL);
1070                         kfree_rcu(dev_maps, rcu);
1071                 }
1072         }
1073
1074         mutex_unlock(&xps_map_mutex);
1075
1076         memset(kobj, 0, sizeof(*kobj));
1077         dev_put(queue->dev);
1078 }
1079
1080 static struct kobj_type netdev_queue_ktype = {
1081         .sysfs_ops = &netdev_queue_sysfs_ops,
1082         .release = netdev_queue_release,
1083         .default_attrs = netdev_queue_default_attrs,
1084 };
1085
1086 static int netdev_queue_add_kobject(struct net_device *net, int index)
1087 {
1088         struct netdev_queue *queue = net->_tx + index;
1089         struct kobject *kobj = &queue->kobj;
1090         int error = 0;
1091
1092         kobj->kset = net->queues_kset;
1093         error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
1094             "tx-%u", index);
1095         if (error) {
1096                 kobject_put(kobj);
1097                 return error;
1098         }
1099
1100         kobject_uevent(kobj, KOBJ_ADD);
1101         dev_hold(queue->dev);
1102
1103         return error;
1104 }
1105 #endif /* CONFIG_XPS */
1106
1107 int
1108 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
1109 {
1110 #ifdef CONFIG_XPS
1111         int i;
1112         int error = 0;
1113
1114         for (i = old_num; i < new_num; i++) {
1115                 error = netdev_queue_add_kobject(net, i);
1116                 if (error) {
1117                         new_num = old_num;
1118                         break;
1119                 }
1120         }
1121
1122         while (--i >= new_num)
1123                 kobject_put(&net->_tx[i].kobj);
1124
1125         return error;
1126 #else
1127         return 0;
1128 #endif
1129 }
1130
1131 static int register_queue_kobjects(struct net_device *net)
1132 {
1133         int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
1134
1135 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1136         net->queues_kset = kset_create_and_add("queues",
1137             NULL, &net->dev.kobj);
1138         if (!net->queues_kset)
1139                 return -ENOMEM;
1140 #endif
1141
1142 #ifdef CONFIG_RPS
1143         real_rx = net->real_num_rx_queues;
1144 #endif
1145         real_tx = net->real_num_tx_queues;
1146
1147         error = net_rx_queue_update_kobjects(net, 0, real_rx);
1148         if (error)
1149                 goto error;
1150         rxq = real_rx;
1151
1152         error = netdev_queue_update_kobjects(net, 0, real_tx);
1153         if (error)
1154                 goto error;
1155         txq = real_tx;
1156
1157         return 0;
1158
1159 error:
1160         netdev_queue_update_kobjects(net, txq, 0);
1161         net_rx_queue_update_kobjects(net, rxq, 0);
1162         return error;
1163 }
1164
1165 static void remove_queue_kobjects(struct net_device *net)
1166 {
1167         int real_rx = 0, real_tx = 0;
1168
1169 #ifdef CONFIG_RPS
1170         real_rx = net->real_num_rx_queues;
1171 #endif
1172         real_tx = net->real_num_tx_queues;
1173
1174         net_rx_queue_update_kobjects(net, real_rx, 0);
1175         netdev_queue_update_kobjects(net, real_tx, 0);
1176 #if defined(CONFIG_RPS) || defined(CONFIG_XPS)
1177         kset_unregister(net->queues_kset);
1178 #endif
1179 }
1180
1181 static void *net_grab_current_ns(void)
1182 {
1183         struct net *ns = current->nsproxy->net_ns;
1184 #ifdef CONFIG_NET_NS
1185         if (ns)
1186                 atomic_inc(&ns->passive);
1187 #endif
1188         return ns;
1189 }
1190
1191 static const void *net_initial_ns(void)
1192 {
1193         return &init_net;
1194 }
1195
1196 static const void *net_netlink_ns(struct sock *sk)
1197 {
1198         return sock_net(sk);
1199 }
1200
1201 struct kobj_ns_type_operations net_ns_type_operations = {
1202         .type = KOBJ_NS_TYPE_NET,
1203         .grab_current_ns = net_grab_current_ns,
1204         .netlink_ns = net_netlink_ns,
1205         .initial_ns = net_initial_ns,
1206         .drop_ns = net_drop_ns,
1207 };
1208 EXPORT_SYMBOL_GPL(net_ns_type_operations);
1209
1210 #ifdef CONFIG_HOTPLUG
1211 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
1212 {
1213         struct net_device *dev = to_net_dev(d);
1214         int retval;
1215
1216         /* pass interface to uevent. */
1217         retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
1218         if (retval)
1219                 goto exit;
1220
1221         /* pass ifindex to uevent.
1222          * ifindex is useful as it won't change (interface name may change)
1223          * and is what RtNetlink uses natively. */
1224         retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
1225
1226 exit:
1227         return retval;
1228 }
1229 #endif
1230
1231 /*
1232  *      netdev_release -- destroy and free a dead device.
1233  *      Called when last reference to device kobject is gone.
1234  */
1235 static void netdev_release(struct device *d)
1236 {
1237         struct net_device *dev = to_net_dev(d);
1238
1239         BUG_ON(dev->reg_state != NETREG_RELEASED);
1240
1241         kfree(dev->ifalias);
1242         kfree((char *)dev - dev->padded);
1243 }
1244
1245 static const void *net_namespace(struct device *d)
1246 {
1247         struct net_device *dev;
1248         dev = container_of(d, struct net_device, dev);
1249         return dev_net(dev);
1250 }
1251
1252 static struct class net_class = {
1253         .name = "net",
1254         .dev_release = netdev_release,
1255 #ifdef CONFIG_SYSFS
1256         .dev_attrs = net_class_attributes,
1257 #endif /* CONFIG_SYSFS */
1258 #ifdef CONFIG_HOTPLUG
1259         .dev_uevent = netdev_uevent,
1260 #endif
1261         .ns_type = &net_ns_type_operations,
1262         .namespace = net_namespace,
1263 };
1264
1265 /* Delete sysfs entries but hold kobject reference until after all
1266  * netdev references are gone.
1267  */
1268 void netdev_unregister_kobject(struct net_device * net)
1269 {
1270         struct device *dev = &(net->dev);
1271
1272         kobject_get(&dev->kobj);
1273
1274         remove_queue_kobjects(net);
1275
1276         device_del(dev);
1277 }
1278
1279 /* Create sysfs entries for network device. */
1280 int netdev_register_kobject(struct net_device *net)
1281 {
1282         struct device *dev = &(net->dev);
1283         const struct attribute_group **groups = net->sysfs_groups;
1284         int error = 0;
1285
1286         device_initialize(dev);
1287         dev->class = &net_class;
1288         dev->platform_data = net;
1289         dev->groups = groups;
1290
1291         dev_set_name(dev, "%s", net->name);
1292
1293 #ifdef CONFIG_SYSFS
1294         /* Allow for a device specific group */
1295         if (*groups)
1296                 groups++;
1297
1298         *groups++ = &netstat_group;
1299 #ifdef CONFIG_WIRELESS_EXT_SYSFS
1300         if (net->ieee80211_ptr)
1301                 *groups++ = &wireless_group;
1302 #ifdef CONFIG_WIRELESS_EXT
1303         else if (net->wireless_handlers)
1304                 *groups++ = &wireless_group;
1305 #endif
1306 #endif
1307 #endif /* CONFIG_SYSFS */
1308
1309         error = device_add(dev);
1310         if (error)
1311                 return error;
1312
1313         error = register_queue_kobjects(net);
1314         if (error) {
1315                 device_del(dev);
1316                 return error;
1317         }
1318
1319         return error;
1320 }
1321
1322 int netdev_class_create_file(struct class_attribute *class_attr)
1323 {
1324         return class_create_file(&net_class, class_attr);
1325 }
1326 EXPORT_SYMBOL(netdev_class_create_file);
1327
1328 void netdev_class_remove_file(struct class_attribute *class_attr)
1329 {
1330         class_remove_file(&net_class, class_attr);
1331 }
1332 EXPORT_SYMBOL(netdev_class_remove_file);
1333
1334 int netdev_kobject_init(void)
1335 {
1336         kobj_ns_type_register(&net_ns_type_operations);
1337         return class_register(&net_class);
1338 }