1 /* 2 * net-sysfs.c - network device class and attributes 3 * 4 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 12 #include <linux/capability.h> 13 #include <linux/kernel.h> 14 #include <linux/netdevice.h> 15 #include <linux/if_arp.h> 16 #include <linux/slab.h> 17 #include <linux/nsproxy.h> 18 #include <net/sock.h> 19 #include <net/net_namespace.h> 20 #include <linux/rtnetlink.h> 21 #include <linux/wireless.h> 22 #include <linux/vmalloc.h> 23 #include <linux/export.h> 24 #include <linux/jiffies.h> 25 #include <net/wext.h> 26 27 #include "net-sysfs.h" 28 29 #ifdef CONFIG_SYSFS 30 static const char fmt_hex[] = "%#x\n"; 31 static const char fmt_long_hex[] = "%#lx\n"; 32 static const char fmt_dec[] = "%d\n"; 33 static const char fmt_udec[] = "%u\n"; 34 static const char fmt_ulong[] = "%lu\n"; 35 static const char fmt_u64[] = "%llu\n"; 36 37 static inline int dev_isalive(const struct net_device *dev) 38 { 39 return dev->reg_state <= NETREG_REGISTERED; 40 } 41 42 /* use same locking rules as GIF* ioctl's */ 43 static ssize_t netdev_show(const struct device *dev, 44 struct device_attribute *attr, char *buf, 45 ssize_t (*format)(const struct net_device *, char *)) 46 { 47 struct net_device *net = to_net_dev(dev); 48 ssize_t ret = -EINVAL; 49 50 read_lock(&dev_base_lock); 51 if (dev_isalive(net)) 52 ret = (*format)(net, buf); 53 read_unlock(&dev_base_lock); 54 55 return ret; 56 } 57 58 /* generate a show function for simple field */ 59 #define NETDEVICE_SHOW(field, format_string) \ 60 static ssize_t format_##field(const struct net_device *net, char *buf) \ 61 { \ 62 return sprintf(buf, format_string, net->field); \ 63 } \ 64 static ssize_t show_##field(struct device *dev, \ 65 struct device_attribute *attr, char *buf) \ 66 { \ 67 return netdev_show(dev, attr, buf, format_##field); \ 68 } 69 70 71 /* use same locking and permission rules as SIF* ioctl's */ 72 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, 73 const char *buf, size_t len, 74 int (*set)(struct net_device *, unsigned long)) 75 { 76 struct net_device *net = to_net_dev(dev); 77 char *endp; 78 unsigned long new; 79 int ret = -EINVAL; 80 81 if (!capable(CAP_NET_ADMIN)) 82 return -EPERM; 83 84 new = simple_strtoul(buf, &endp, 0); 85 if (endp == buf) 86 goto err; 87 88 if (!rtnl_trylock()) 89 return restart_syscall(); 90 91 if (dev_isalive(net)) { 92 if ((ret = (*set)(net, new)) == 0) 93 ret = len; 94 } 95 rtnl_unlock(); 96 err: 97 return ret; 98 } 99 100 NETDEVICE_SHOW(dev_id, fmt_hex); 101 NETDEVICE_SHOW(addr_assign_type, fmt_dec); 102 NETDEVICE_SHOW(addr_len, fmt_dec); 103 NETDEVICE_SHOW(iflink, fmt_dec); 104 NETDEVICE_SHOW(ifindex, fmt_dec); 105 NETDEVICE_SHOW(type, fmt_dec); 106 NETDEVICE_SHOW(link_mode, fmt_dec); 107 108 /* use same locking rules as GIFHWADDR ioctl's */ 109 static ssize_t show_address(struct device *dev, struct device_attribute *attr, 110 char *buf) 111 { 112 struct net_device *net = to_net_dev(dev); 113 ssize_t ret = -EINVAL; 114 115 read_lock(&dev_base_lock); 116 if (dev_isalive(net)) 117 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len); 118 read_unlock(&dev_base_lock); 119 return ret; 120 } 121 122 static ssize_t show_broadcast(struct device *dev, 123 struct device_attribute *attr, char *buf) 124 { 125 struct net_device *net = to_net_dev(dev); 126 if (dev_isalive(net)) 127 return sysfs_format_mac(buf, net->broadcast, net->addr_len); 128 return -EINVAL; 129 } 130 131 static ssize_t show_carrier(struct device *dev, 132 struct device_attribute *attr, char *buf) 133 { 134 struct net_device *netdev = to_net_dev(dev); 135 if (netif_running(netdev)) { 136 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); 137 } 138 return -EINVAL; 139 } 140 141 static ssize_t show_speed(struct device *dev, 142 struct device_attribute *attr, char *buf) 143 { 144 struct net_device *netdev = to_net_dev(dev); 145 int ret = -EINVAL; 146 147 if (!rtnl_trylock()) 148 return restart_syscall(); 149 150 if (netif_running(netdev)) { 151 struct ethtool_cmd cmd; 152 if (!__ethtool_get_settings(netdev, &cmd)) 153 ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd)); 154 } 155 rtnl_unlock(); 156 return ret; 157 } 158 159 static ssize_t show_duplex(struct device *dev, 160 struct device_attribute *attr, char *buf) 161 { 162 struct net_device *netdev = to_net_dev(dev); 163 int ret = -EINVAL; 164 165 if (!rtnl_trylock()) 166 return restart_syscall(); 167 168 if (netif_running(netdev)) { 169 struct ethtool_cmd cmd; 170 if (!__ethtool_get_settings(netdev, &cmd)) 171 ret = sprintf(buf, "%s\n", 172 cmd.duplex ? "full" : "half"); 173 } 174 rtnl_unlock(); 175 return ret; 176 } 177 178 static ssize_t show_dormant(struct device *dev, 179 struct device_attribute *attr, char *buf) 180 { 181 struct net_device *netdev = to_net_dev(dev); 182 183 if (netif_running(netdev)) 184 return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); 185 186 return -EINVAL; 187 } 188 189 static const char *const operstates[] = { 190 "unknown", 191 "notpresent", /* currently unused */ 192 "down", 193 "lowerlayerdown", 194 "testing", /* currently unused */ 195 "dormant", 196 "up" 197 }; 198 199 static ssize_t show_operstate(struct device *dev, 200 struct device_attribute *attr, char *buf) 201 { 202 const struct net_device *netdev = to_net_dev(dev); 203 unsigned char operstate; 204 205 read_lock(&dev_base_lock); 206 operstate = netdev->operstate; 207 if (!netif_running(netdev)) 208 operstate = IF_OPER_DOWN; 209 read_unlock(&dev_base_lock); 210 211 if (operstate >= ARRAY_SIZE(operstates)) 212 return -EINVAL; /* should not happen */ 213 214 return sprintf(buf, "%s\n", operstates[operstate]); 215 } 216 217 /* read-write attributes */ 218 NETDEVICE_SHOW(mtu, fmt_dec); 219 220 static int change_mtu(struct net_device *net, unsigned long new_mtu) 221 { 222 return dev_set_mtu(net, (int) new_mtu); 223 } 224 225 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr, 226 const char *buf, size_t len) 227 { 228 return netdev_store(dev, attr, buf, len, change_mtu); 229 } 230 231 NETDEVICE_SHOW(flags, fmt_hex); 232 233 static int change_flags(struct net_device *net, unsigned long new_flags) 234 { 235 return dev_change_flags(net, (unsigned) new_flags); 236 } 237 238 static ssize_t store_flags(struct device *dev, struct device_attribute *attr, 239 const char *buf, size_t len) 240 { 241 return netdev_store(dev, attr, buf, len, change_flags); 242 } 243 244 NETDEVICE_SHOW(tx_queue_len, fmt_ulong); 245 246 static int change_tx_queue_len(struct net_device *net, unsigned long new_len) 247 { 248 net->tx_queue_len = new_len; 249 return 0; 250 } 251 252 static ssize_t store_tx_queue_len(struct device *dev, 253 struct device_attribute *attr, 254 const char *buf, size_t len) 255 { 256 return netdev_store(dev, attr, buf, len, change_tx_queue_len); 257 } 258 259 static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr, 260 const char *buf, size_t len) 261 { 262 struct net_device *netdev = to_net_dev(dev); 263 size_t count = len; 264 ssize_t ret; 265 266 if (!capable(CAP_NET_ADMIN)) 267 return -EPERM; 268 269 /* ignore trailing newline */ 270 if (len > 0 && buf[len - 1] == '\n') 271 --count; 272 273 if (!rtnl_trylock()) 274 return restart_syscall(); 275 ret = dev_set_alias(netdev, buf, count); 276 rtnl_unlock(); 277 278 return ret < 0 ? ret : len; 279 } 280 281 static ssize_t show_ifalias(struct device *dev, 282 struct device_attribute *attr, char *buf) 283 { 284 const struct net_device *netdev = to_net_dev(dev); 285 ssize_t ret = 0; 286 287 if (!rtnl_trylock()) 288 return restart_syscall(); 289 if (netdev->ifalias) 290 ret = sprintf(buf, "%s\n", netdev->ifalias); 291 rtnl_unlock(); 292 return ret; 293 } 294 295 NETDEVICE_SHOW(group, fmt_dec); 296 297 static int change_group(struct net_device *net, unsigned long new_group) 298 { 299 dev_set_group(net, (int) new_group); 300 return 0; 301 } 302 303 static ssize_t store_group(struct device *dev, struct device_attribute *attr, 304 const char *buf, size_t len) 305 { 306 return netdev_store(dev, attr, buf, len, change_group); 307 } 308 309 static struct device_attribute net_class_attributes[] = { 310 __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL), 311 __ATTR(addr_len, S_IRUGO, show_addr_len, NULL), 312 __ATTR(dev_id, S_IRUGO, show_dev_id, NULL), 313 __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias), 314 __ATTR(iflink, S_IRUGO, show_iflink, NULL), 315 __ATTR(ifindex, S_IRUGO, show_ifindex, 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 (map) 611 static_key_slow_inc(&rps_needed); 612 if (old_map) { 613 kfree_rcu(old_map, rcu); 614 static_key_slow_dec(&rps_needed); 615 } 616 free_cpumask_var(mask); 617 return len; 618 } 619 620 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 621 struct rx_queue_attribute *attr, 622 char *buf) 623 { 624 struct rps_dev_flow_table *flow_table; 625 unsigned long val = 0; 626 627 rcu_read_lock(); 628 flow_table = rcu_dereference(queue->rps_flow_table); 629 if (flow_table) 630 val = (unsigned long)flow_table->mask + 1; 631 rcu_read_unlock(); 632 633 return sprintf(buf, "%lu\n", val); 634 } 635 636 static void rps_dev_flow_table_release_work(struct work_struct *work) 637 { 638 struct rps_dev_flow_table *table = container_of(work, 639 struct rps_dev_flow_table, free_work); 640 641 vfree(table); 642 } 643 644 static void rps_dev_flow_table_release(struct rcu_head *rcu) 645 { 646 struct rps_dev_flow_table *table = container_of(rcu, 647 struct rps_dev_flow_table, rcu); 648 649 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work); 650 schedule_work(&table->free_work); 651 } 652 653 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 654 struct rx_queue_attribute *attr, 655 const char *buf, size_t len) 656 { 657 unsigned long mask, count; 658 struct rps_dev_flow_table *table, *old_table; 659 static DEFINE_SPINLOCK(rps_dev_flow_lock); 660 int rc; 661 662 if (!capable(CAP_NET_ADMIN)) 663 return -EPERM; 664 665 rc = kstrtoul(buf, 0, &count); 666 if (rc < 0) 667 return rc; 668 669 if (count) { 670 mask = count - 1; 671 /* mask = roundup_pow_of_two(count) - 1; 672 * without overflows... 673 */ 674 while ((mask | (mask >> 1)) != mask) 675 mask |= (mask >> 1); 676 /* On 64 bit arches, must check mask fits in table->mask (u32), 677 * and on 32bit arches, must check RPS_DEV_FLOW_TABLE_SIZE(mask + 1) 678 * doesnt overflow. 679 */ 680 #if BITS_PER_LONG > 32 681 if (mask > (unsigned long)(u32)mask) 682 return -EINVAL; 683 #else 684 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) 685 / sizeof(struct rps_dev_flow)) { 686 /* Enforce a limit to prevent overflow */ 687 return -EINVAL; 688 } 689 #endif 690 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); 691 if (!table) 692 return -ENOMEM; 693 694 table->mask = mask; 695 for (count = 0; count <= mask; count++) 696 table->flows[count].cpu = RPS_NO_CPU; 697 } else 698 table = NULL; 699 700 spin_lock(&rps_dev_flow_lock); 701 old_table = rcu_dereference_protected(queue->rps_flow_table, 702 lockdep_is_held(&rps_dev_flow_lock)); 703 rcu_assign_pointer(queue->rps_flow_table, table); 704 spin_unlock(&rps_dev_flow_lock); 705 706 if (old_table) 707 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 708 709 return len; 710 } 711 712 static struct rx_queue_attribute rps_cpus_attribute = 713 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); 714 715 716 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = 717 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, 718 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 719 720 static struct attribute *rx_queue_default_attrs[] = { 721 &rps_cpus_attribute.attr, 722 &rps_dev_flow_table_cnt_attribute.attr, 723 NULL 724 }; 725 726 static void rx_queue_release(struct kobject *kobj) 727 { 728 struct netdev_rx_queue *queue = to_rx_queue(kobj); 729 struct rps_map *map; 730 struct rps_dev_flow_table *flow_table; 731 732 733 map = rcu_dereference_protected(queue->rps_map, 1); 734 if (map) { 735 RCU_INIT_POINTER(queue->rps_map, NULL); 736 kfree_rcu(map, rcu); 737 } 738 739 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); 740 if (flow_table) { 741 RCU_INIT_POINTER(queue->rps_flow_table, NULL); 742 call_rcu(&flow_table->rcu, rps_dev_flow_table_release); 743 } 744 745 memset(kobj, 0, sizeof(*kobj)); 746 dev_put(queue->dev); 747 } 748 749 static struct kobj_type rx_queue_ktype = { 750 .sysfs_ops = &rx_queue_sysfs_ops, 751 .release = rx_queue_release, 752 .default_attrs = rx_queue_default_attrs, 753 }; 754 755 static int rx_queue_add_kobject(struct net_device *net, int index) 756 { 757 struct netdev_rx_queue *queue = net->_rx + index; 758 struct kobject *kobj = &queue->kobj; 759 int error = 0; 760 761 kobj->kset = net->queues_kset; 762 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 763 "rx-%u", index); 764 if (error) { 765 kobject_put(kobj); 766 return error; 767 } 768 769 kobject_uevent(kobj, KOBJ_ADD); 770 dev_hold(queue->dev); 771 772 return error; 773 } 774 #endif /* CONFIG_RPS */ 775 776 int 777 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num) 778 { 779 #ifdef CONFIG_RPS 780 int i; 781 int error = 0; 782 783 for (i = old_num; i < new_num; i++) { 784 error = rx_queue_add_kobject(net, i); 785 if (error) { 786 new_num = old_num; 787 break; 788 } 789 } 790 791 while (--i >= new_num) 792 kobject_put(&net->_rx[i].kobj); 793 794 return error; 795 #else 796 return 0; 797 #endif 798 } 799 800 #ifdef CONFIG_SYSFS 801 /* 802 * netdev_queue sysfs structures and functions. 803 */ 804 struct netdev_queue_attribute { 805 struct attribute attr; 806 ssize_t (*show)(struct netdev_queue *queue, 807 struct netdev_queue_attribute *attr, char *buf); 808 ssize_t (*store)(struct netdev_queue *queue, 809 struct netdev_queue_attribute *attr, const char *buf, size_t len); 810 }; 811 #define to_netdev_queue_attr(_attr) container_of(_attr, \ 812 struct netdev_queue_attribute, attr) 813 814 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) 815 816 static ssize_t netdev_queue_attr_show(struct kobject *kobj, 817 struct attribute *attr, char *buf) 818 { 819 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 820 struct netdev_queue *queue = to_netdev_queue(kobj); 821 822 if (!attribute->show) 823 return -EIO; 824 825 return attribute->show(queue, attribute, buf); 826 } 827 828 static ssize_t netdev_queue_attr_store(struct kobject *kobj, 829 struct attribute *attr, 830 const char *buf, size_t count) 831 { 832 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 833 struct netdev_queue *queue = to_netdev_queue(kobj); 834 835 if (!attribute->store) 836 return -EIO; 837 838 return attribute->store(queue, attribute, buf, count); 839 } 840 841 static const struct sysfs_ops netdev_queue_sysfs_ops = { 842 .show = netdev_queue_attr_show, 843 .store = netdev_queue_attr_store, 844 }; 845 846 static ssize_t show_trans_timeout(struct netdev_queue *queue, 847 struct netdev_queue_attribute *attribute, 848 char *buf) 849 { 850 unsigned long trans_timeout; 851 852 spin_lock_irq(&queue->_xmit_lock); 853 trans_timeout = queue->trans_timeout; 854 spin_unlock_irq(&queue->_xmit_lock); 855 856 return sprintf(buf, "%lu", trans_timeout); 857 } 858 859 static struct netdev_queue_attribute queue_trans_timeout = 860 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL); 861 862 #ifdef CONFIG_BQL 863 /* 864 * Byte queue limits sysfs structures and functions. 865 */ 866 static ssize_t bql_show(char *buf, unsigned int value) 867 { 868 return sprintf(buf, "%u\n", value); 869 } 870 871 static ssize_t bql_set(const char *buf, const size_t count, 872 unsigned int *pvalue) 873 { 874 unsigned int value; 875 int err; 876 877 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) 878 value = DQL_MAX_LIMIT; 879 else { 880 err = kstrtouint(buf, 10, &value); 881 if (err < 0) 882 return err; 883 if (value > DQL_MAX_LIMIT) 884 return -EINVAL; 885 } 886 887 *pvalue = value; 888 889 return count; 890 } 891 892 static ssize_t bql_show_hold_time(struct netdev_queue *queue, 893 struct netdev_queue_attribute *attr, 894 char *buf) 895 { 896 struct dql *dql = &queue->dql; 897 898 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); 899 } 900 901 static ssize_t bql_set_hold_time(struct netdev_queue *queue, 902 struct netdev_queue_attribute *attribute, 903 const char *buf, size_t len) 904 { 905 struct dql *dql = &queue->dql; 906 unsigned value; 907 int err; 908 909 err = kstrtouint(buf, 10, &value); 910 if (err < 0) 911 return err; 912 913 dql->slack_hold_time = msecs_to_jiffies(value); 914 915 return len; 916 } 917 918 static struct netdev_queue_attribute bql_hold_time_attribute = 919 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time, 920 bql_set_hold_time); 921 922 static ssize_t bql_show_inflight(struct netdev_queue *queue, 923 struct netdev_queue_attribute *attr, 924 char *buf) 925 { 926 struct dql *dql = &queue->dql; 927 928 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); 929 } 930 931 static struct netdev_queue_attribute bql_inflight_attribute = 932 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL); 933 934 #define BQL_ATTR(NAME, FIELD) \ 935 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ 936 struct netdev_queue_attribute *attr, \ 937 char *buf) \ 938 { \ 939 return bql_show(buf, queue->dql.FIELD); \ 940 } \ 941 \ 942 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ 943 struct netdev_queue_attribute *attr, \ 944 const char *buf, size_t len) \ 945 { \ 946 return bql_set(buf, len, &queue->dql.FIELD); \ 947 } \ 948 \ 949 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \ 950 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \ 951 bql_set_ ## NAME); 952 953 BQL_ATTR(limit, limit) 954 BQL_ATTR(limit_max, max_limit) 955 BQL_ATTR(limit_min, min_limit) 956 957 static struct attribute *dql_attrs[] = { 958 &bql_limit_attribute.attr, 959 &bql_limit_max_attribute.attr, 960 &bql_limit_min_attribute.attr, 961 &bql_hold_time_attribute.attr, 962 &bql_inflight_attribute.attr, 963 NULL 964 }; 965 966 static struct attribute_group dql_group = { 967 .name = "byte_queue_limits", 968 .attrs = dql_attrs, 969 }; 970 #endif /* CONFIG_BQL */ 971 972 #ifdef CONFIG_XPS 973 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue) 974 { 975 struct net_device *dev = queue->dev; 976 int i; 977 978 for (i = 0; i < dev->num_tx_queues; i++) 979 if (queue == &dev->_tx[i]) 980 break; 981 982 BUG_ON(i >= dev->num_tx_queues); 983 984 return i; 985 } 986 987 988 static ssize_t show_xps_map(struct netdev_queue *queue, 989 struct netdev_queue_attribute *attribute, char *buf) 990 { 991 struct net_device *dev = queue->dev; 992 struct xps_dev_maps *dev_maps; 993 cpumask_var_t mask; 994 unsigned long index; 995 size_t len = 0; 996 int i; 997 998 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 999 return -ENOMEM; 1000 1001 index = get_netdev_queue_index(queue); 1002 1003 rcu_read_lock(); 1004 dev_maps = rcu_dereference(dev->xps_maps); 1005 if (dev_maps) { 1006 for_each_possible_cpu(i) { 1007 struct xps_map *map = 1008 rcu_dereference(dev_maps->cpu_map[i]); 1009 if (map) { 1010 int j; 1011 for (j = 0; j < map->len; j++) { 1012 if (map->queues[j] == index) { 1013 cpumask_set_cpu(i, mask); 1014 break; 1015 } 1016 } 1017 } 1018 } 1019 } 1020 rcu_read_unlock(); 1021 1022 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask); 1023 if (PAGE_SIZE - len < 3) { 1024 free_cpumask_var(mask); 1025 return -EINVAL; 1026 } 1027 1028 free_cpumask_var(mask); 1029 len += sprintf(buf + len, "\n"); 1030 return len; 1031 } 1032 1033 static DEFINE_MUTEX(xps_map_mutex); 1034 #define xmap_dereference(P) \ 1035 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex)) 1036 1037 static void xps_queue_release(struct netdev_queue *queue) 1038 { 1039 struct net_device *dev = queue->dev; 1040 struct xps_dev_maps *dev_maps; 1041 struct xps_map *map; 1042 unsigned long index; 1043 int i, pos, nonempty = 0; 1044 1045 index = get_netdev_queue_index(queue); 1046 1047 mutex_lock(&xps_map_mutex); 1048 dev_maps = xmap_dereference(dev->xps_maps); 1049 1050 if (dev_maps) { 1051 for_each_possible_cpu(i) { 1052 map = xmap_dereference(dev_maps->cpu_map[i]); 1053 if (!map) 1054 continue; 1055 1056 for (pos = 0; pos < map->len; pos++) 1057 if (map->queues[pos] == index) 1058 break; 1059 1060 if (pos < map->len) { 1061 if (map->len > 1) 1062 map->queues[pos] = 1063 map->queues[--map->len]; 1064 else { 1065 RCU_INIT_POINTER(dev_maps->cpu_map[i], 1066 NULL); 1067 kfree_rcu(map, rcu); 1068 map = NULL; 1069 } 1070 } 1071 if (map) 1072 nonempty = 1; 1073 } 1074 1075 if (!nonempty) { 1076 RCU_INIT_POINTER(dev->xps_maps, NULL); 1077 kfree_rcu(dev_maps, rcu); 1078 } 1079 } 1080 mutex_unlock(&xps_map_mutex); 1081 } 1082 1083 static ssize_t store_xps_map(struct netdev_queue *queue, 1084 struct netdev_queue_attribute *attribute, 1085 const char *buf, size_t len) 1086 { 1087 struct net_device *dev = queue->dev; 1088 cpumask_var_t mask; 1089 int err, i, cpu, pos, map_len, alloc_len, need_set; 1090 unsigned long index; 1091 struct xps_map *map, *new_map; 1092 struct xps_dev_maps *dev_maps, *new_dev_maps; 1093 int nonempty = 0; 1094 int numa_node_id = -2; 1095 1096 if (!capable(CAP_NET_ADMIN)) 1097 return -EPERM; 1098 1099 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 1100 return -ENOMEM; 1101 1102 index = get_netdev_queue_index(queue); 1103 1104 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 1105 if (err) { 1106 free_cpumask_var(mask); 1107 return err; 1108 } 1109 1110 new_dev_maps = kzalloc(max_t(unsigned, 1111 XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL); 1112 if (!new_dev_maps) { 1113 free_cpumask_var(mask); 1114 return -ENOMEM; 1115 } 1116 1117 mutex_lock(&xps_map_mutex); 1118 1119 dev_maps = xmap_dereference(dev->xps_maps); 1120 1121 for_each_possible_cpu(cpu) { 1122 map = dev_maps ? 1123 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL; 1124 new_map = map; 1125 if (map) { 1126 for (pos = 0; pos < map->len; pos++) 1127 if (map->queues[pos] == index) 1128 break; 1129 map_len = map->len; 1130 alloc_len = map->alloc_len; 1131 } else 1132 pos = map_len = alloc_len = 0; 1133 1134 need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu); 1135 #ifdef CONFIG_NUMA 1136 if (need_set) { 1137 if (numa_node_id == -2) 1138 numa_node_id = cpu_to_node(cpu); 1139 else if (numa_node_id != cpu_to_node(cpu)) 1140 numa_node_id = -1; 1141 } 1142 #endif 1143 if (need_set && pos >= map_len) { 1144 /* Need to add queue to this CPU's map */ 1145 if (map_len >= alloc_len) { 1146 alloc_len = alloc_len ? 1147 2 * alloc_len : XPS_MIN_MAP_ALLOC; 1148 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), 1149 GFP_KERNEL, 1150 cpu_to_node(cpu)); 1151 if (!new_map) 1152 goto error; 1153 new_map->alloc_len = alloc_len; 1154 for (i = 0; i < map_len; i++) 1155 new_map->queues[i] = map->queues[i]; 1156 new_map->len = map_len; 1157 } 1158 new_map->queues[new_map->len++] = index; 1159 } else if (!need_set && pos < map_len) { 1160 /* Need to remove queue from this CPU's map */ 1161 if (map_len > 1) 1162 new_map->queues[pos] = 1163 new_map->queues[--new_map->len]; 1164 else 1165 new_map = NULL; 1166 } 1167 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map); 1168 } 1169 1170 /* Cleanup old maps */ 1171 for_each_possible_cpu(cpu) { 1172 map = dev_maps ? 1173 xmap_dereference(dev_maps->cpu_map[cpu]) : NULL; 1174 if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map) 1175 kfree_rcu(map, rcu); 1176 if (new_dev_maps->cpu_map[cpu]) 1177 nonempty = 1; 1178 } 1179 1180 if (nonempty) { 1181 rcu_assign_pointer(dev->xps_maps, new_dev_maps); 1182 } else { 1183 kfree(new_dev_maps); 1184 RCU_INIT_POINTER(dev->xps_maps, NULL); 1185 } 1186 1187 if (dev_maps) 1188 kfree_rcu(dev_maps, rcu); 1189 1190 netdev_queue_numa_node_write(queue, (numa_node_id >= 0) ? numa_node_id : 1191 NUMA_NO_NODE); 1192 1193 mutex_unlock(&xps_map_mutex); 1194 1195 free_cpumask_var(mask); 1196 return len; 1197 1198 error: 1199 mutex_unlock(&xps_map_mutex); 1200 1201 if (new_dev_maps) 1202 for_each_possible_cpu(i) 1203 kfree(rcu_dereference_protected( 1204 new_dev_maps->cpu_map[i], 1205 1)); 1206 kfree(new_dev_maps); 1207 free_cpumask_var(mask); 1208 return -ENOMEM; 1209 } 1210 1211 static struct netdev_queue_attribute xps_cpus_attribute = 1212 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map); 1213 #endif /* CONFIG_XPS */ 1214 1215 static struct attribute *netdev_queue_default_attrs[] = { 1216 &queue_trans_timeout.attr, 1217 #ifdef CONFIG_XPS 1218 &xps_cpus_attribute.attr, 1219 #endif 1220 NULL 1221 }; 1222 1223 static void netdev_queue_release(struct kobject *kobj) 1224 { 1225 struct netdev_queue *queue = to_netdev_queue(kobj); 1226 1227 #ifdef CONFIG_XPS 1228 xps_queue_release(queue); 1229 #endif 1230 1231 memset(kobj, 0, sizeof(*kobj)); 1232 dev_put(queue->dev); 1233 } 1234 1235 static struct kobj_type netdev_queue_ktype = { 1236 .sysfs_ops = &netdev_queue_sysfs_ops, 1237 .release = netdev_queue_release, 1238 .default_attrs = netdev_queue_default_attrs, 1239 }; 1240 1241 static int netdev_queue_add_kobject(struct net_device *net, int index) 1242 { 1243 struct netdev_queue *queue = net->_tx + index; 1244 struct kobject *kobj = &queue->kobj; 1245 int error = 0; 1246 1247 kobj->kset = net->queues_kset; 1248 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, 1249 "tx-%u", index); 1250 if (error) 1251 goto exit; 1252 1253 #ifdef CONFIG_BQL 1254 error = sysfs_create_group(kobj, &dql_group); 1255 if (error) 1256 goto exit; 1257 #endif 1258 1259 kobject_uevent(kobj, KOBJ_ADD); 1260 dev_hold(queue->dev); 1261 1262 return 0; 1263 exit: 1264 kobject_put(kobj); 1265 return error; 1266 } 1267 #endif /* CONFIG_SYSFS */ 1268 1269 int 1270 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num) 1271 { 1272 #ifdef CONFIG_SYSFS 1273 int i; 1274 int error = 0; 1275 1276 for (i = old_num; i < new_num; i++) { 1277 error = netdev_queue_add_kobject(net, i); 1278 if (error) { 1279 new_num = old_num; 1280 break; 1281 } 1282 } 1283 1284 while (--i >= new_num) { 1285 struct netdev_queue *queue = net->_tx + i; 1286 1287 #ifdef CONFIG_BQL 1288 sysfs_remove_group(&queue->kobj, &dql_group); 1289 #endif 1290 kobject_put(&queue->kobj); 1291 } 1292 1293 return error; 1294 #else 1295 return 0; 1296 #endif /* CONFIG_SYSFS */ 1297 } 1298 1299 static int register_queue_kobjects(struct net_device *net) 1300 { 1301 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; 1302 1303 #ifdef CONFIG_SYSFS 1304 net->queues_kset = kset_create_and_add("queues", 1305 NULL, &net->dev.kobj); 1306 if (!net->queues_kset) 1307 return -ENOMEM; 1308 #endif 1309 1310 #ifdef CONFIG_RPS 1311 real_rx = net->real_num_rx_queues; 1312 #endif 1313 real_tx = net->real_num_tx_queues; 1314 1315 error = net_rx_queue_update_kobjects(net, 0, real_rx); 1316 if (error) 1317 goto error; 1318 rxq = real_rx; 1319 1320 error = netdev_queue_update_kobjects(net, 0, real_tx); 1321 if (error) 1322 goto error; 1323 txq = real_tx; 1324 1325 return 0; 1326 1327 error: 1328 netdev_queue_update_kobjects(net, txq, 0); 1329 net_rx_queue_update_kobjects(net, rxq, 0); 1330 return error; 1331 } 1332 1333 static void remove_queue_kobjects(struct net_device *net) 1334 { 1335 int real_rx = 0, real_tx = 0; 1336 1337 #ifdef CONFIG_RPS 1338 real_rx = net->real_num_rx_queues; 1339 #endif 1340 real_tx = net->real_num_tx_queues; 1341 1342 net_rx_queue_update_kobjects(net, real_rx, 0); 1343 netdev_queue_update_kobjects(net, real_tx, 0); 1344 #ifdef CONFIG_SYSFS 1345 kset_unregister(net->queues_kset); 1346 #endif 1347 } 1348 1349 static void *net_grab_current_ns(void) 1350 { 1351 struct net *ns = current->nsproxy->net_ns; 1352 #ifdef CONFIG_NET_NS 1353 if (ns) 1354 atomic_inc(&ns->passive); 1355 #endif 1356 return ns; 1357 } 1358 1359 static const void *net_initial_ns(void) 1360 { 1361 return &init_net; 1362 } 1363 1364 static const void *net_netlink_ns(struct sock *sk) 1365 { 1366 return sock_net(sk); 1367 } 1368 1369 struct kobj_ns_type_operations net_ns_type_operations = { 1370 .type = KOBJ_NS_TYPE_NET, 1371 .grab_current_ns = net_grab_current_ns, 1372 .netlink_ns = net_netlink_ns, 1373 .initial_ns = net_initial_ns, 1374 .drop_ns = net_drop_ns, 1375 }; 1376 EXPORT_SYMBOL_GPL(net_ns_type_operations); 1377 1378 #ifdef CONFIG_HOTPLUG 1379 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 1380 { 1381 struct net_device *dev = to_net_dev(d); 1382 int retval; 1383 1384 /* pass interface to uevent. */ 1385 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 1386 if (retval) 1387 goto exit; 1388 1389 /* pass ifindex to uevent. 1390 * ifindex is useful as it won't change (interface name may change) 1391 * and is what RtNetlink uses natively. */ 1392 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 1393 1394 exit: 1395 return retval; 1396 } 1397 #endif 1398 1399 /* 1400 * netdev_release -- destroy and free a dead device. 1401 * Called when last reference to device kobject is gone. 1402 */ 1403 static void netdev_release(struct device *d) 1404 { 1405 struct net_device *dev = to_net_dev(d); 1406 1407 BUG_ON(dev->reg_state != NETREG_RELEASED); 1408 1409 kfree(dev->ifalias); 1410 kfree((char *)dev - dev->padded); 1411 } 1412 1413 static const void *net_namespace(struct device *d) 1414 { 1415 struct net_device *dev; 1416 dev = container_of(d, struct net_device, dev); 1417 return dev_net(dev); 1418 } 1419 1420 static struct class net_class = { 1421 .name = "net", 1422 .dev_release = netdev_release, 1423 #ifdef CONFIG_SYSFS 1424 .dev_attrs = net_class_attributes, 1425 #endif /* CONFIG_SYSFS */ 1426 #ifdef CONFIG_HOTPLUG 1427 .dev_uevent = netdev_uevent, 1428 #endif 1429 .ns_type = &net_ns_type_operations, 1430 .namespace = net_namespace, 1431 }; 1432 1433 /* Delete sysfs entries but hold kobject reference until after all 1434 * netdev references are gone. 1435 */ 1436 void netdev_unregister_kobject(struct net_device * net) 1437 { 1438 struct device *dev = &(net->dev); 1439 1440 kobject_get(&dev->kobj); 1441 1442 remove_queue_kobjects(net); 1443 1444 device_del(dev); 1445 } 1446 1447 /* Create sysfs entries for network device. */ 1448 int netdev_register_kobject(struct net_device *net) 1449 { 1450 struct device *dev = &(net->dev); 1451 const struct attribute_group **groups = net->sysfs_groups; 1452 int error = 0; 1453 1454 device_initialize(dev); 1455 dev->class = &net_class; 1456 dev->platform_data = net; 1457 dev->groups = groups; 1458 1459 dev_set_name(dev, "%s", net->name); 1460 1461 #ifdef CONFIG_SYSFS 1462 /* Allow for a device specific group */ 1463 if (*groups) 1464 groups++; 1465 1466 *groups++ = &netstat_group; 1467 #ifdef CONFIG_WIRELESS_EXT_SYSFS 1468 if (net->ieee80211_ptr) 1469 *groups++ = &wireless_group; 1470 #ifdef CONFIG_WIRELESS_EXT 1471 else if (net->wireless_handlers) 1472 *groups++ = &wireless_group; 1473 #endif 1474 #endif 1475 #endif /* CONFIG_SYSFS */ 1476 1477 error = device_add(dev); 1478 if (error) 1479 return error; 1480 1481 error = register_queue_kobjects(net); 1482 if (error) { 1483 device_del(dev); 1484 return error; 1485 } 1486 1487 return error; 1488 } 1489 1490 int netdev_class_create_file(struct class_attribute *class_attr) 1491 { 1492 return class_create_file(&net_class, class_attr); 1493 } 1494 EXPORT_SYMBOL(netdev_class_create_file); 1495 1496 void netdev_class_remove_file(struct class_attribute *class_attr) 1497 { 1498 class_remove_file(&net_class, class_attr); 1499 } 1500 EXPORT_SYMBOL(netdev_class_remove_file); 1501 1502 int netdev_kobject_init(void) 1503 { 1504 kobj_ns_type_register(&net_ns_type_operations); 1505 return class_register(&net_class); 1506 } 1507