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_ulong[] = "%lu\n"; 32 33 static inline int dev_isalive(const struct net_device *dev) 34 { 35 return dev->reg_state <= NETREG_REGISTERED; 36 } 37 38 /* use same locking rules as GIF* ioctl's */ 39 static ssize_t netdev_show(const struct device *dev, 40 struct device_attribute *attr, char *buf, 41 ssize_t (*format)(const struct net_device *, char *)) 42 { 43 struct net_device *net = to_net_dev(dev); 44 ssize_t ret = -EINVAL; 45 46 read_lock(&dev_base_lock); 47 if (dev_isalive(net)) 48 ret = (*format)(net, buf); 49 read_unlock(&dev_base_lock); 50 51 return ret; 52 } 53 54 /* generate a show function for simple field */ 55 #define NETDEVICE_SHOW(field, format_string) \ 56 static ssize_t format_##field(const struct net_device *net, char *buf) \ 57 { \ 58 return sprintf(buf, format_string, net->field); \ 59 } \ 60 static ssize_t show_##field(struct device *dev, \ 61 struct device_attribute *attr, char *buf) \ 62 { \ 63 return netdev_show(dev, attr, buf, format_##field); \ 64 } 65 66 67 /* use same locking and permission rules as SIF* ioctl's */ 68 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, 69 const char *buf, size_t len, 70 int (*set)(struct net_device *, unsigned long)) 71 { 72 struct net_device *net = to_net_dev(dev); 73 char *endp; 74 unsigned long new; 75 int ret = -EINVAL; 76 77 if (!capable(CAP_NET_ADMIN)) 78 return -EPERM; 79 80 new = simple_strtoul(buf, &endp, 0); 81 if (endp == buf) 82 goto err; 83 84 if (!rtnl_trylock()) 85 return restart_syscall(); 86 87 if (dev_isalive(net)) { 88 if ((ret = (*set)(net, new)) == 0) 89 ret = len; 90 } 91 rtnl_unlock(); 92 err: 93 return ret; 94 } 95 96 NETDEVICE_SHOW(dev_id, fmt_hex); 97 NETDEVICE_SHOW(addr_len, fmt_dec); 98 NETDEVICE_SHOW(iflink, fmt_dec); 99 NETDEVICE_SHOW(ifindex, fmt_dec); 100 NETDEVICE_SHOW(features, fmt_long_hex); 101 NETDEVICE_SHOW(type, fmt_dec); 102 NETDEVICE_SHOW(link_mode, fmt_dec); 103 104 /* use same locking rules as GIFHWADDR ioctl's */ 105 static ssize_t show_address(struct device *dev, struct device_attribute *attr, 106 char *buf) 107 { 108 struct net_device *net = to_net_dev(dev); 109 ssize_t ret = -EINVAL; 110 111 read_lock(&dev_base_lock); 112 if (dev_isalive(net)) 113 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len); 114 read_unlock(&dev_base_lock); 115 return ret; 116 } 117 118 static ssize_t show_broadcast(struct device *dev, 119 struct device_attribute *attr, char *buf) 120 { 121 struct net_device *net = to_net_dev(dev); 122 if (dev_isalive(net)) 123 return sysfs_format_mac(buf, net->broadcast, net->addr_len); 124 return -EINVAL; 125 } 126 127 static ssize_t show_carrier(struct device *dev, 128 struct device_attribute *attr, char *buf) 129 { 130 struct net_device *netdev = to_net_dev(dev); 131 if (netif_running(netdev)) { 132 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); 133 } 134 return -EINVAL; 135 } 136 137 static ssize_t show_speed(struct device *dev, 138 struct device_attribute *attr, char *buf) 139 { 140 struct net_device *netdev = to_net_dev(dev); 141 int ret = -EINVAL; 142 143 if (!rtnl_trylock()) 144 return restart_syscall(); 145 146 if (netif_running(netdev) && 147 netdev->ethtool_ops && 148 netdev->ethtool_ops->get_settings) { 149 struct ethtool_cmd cmd = { ETHTOOL_GSET }; 150 151 if (!netdev->ethtool_ops->get_settings(netdev, &cmd)) 152 ret = sprintf(buf, fmt_dec, 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 netdev->ethtool_ops && 169 netdev->ethtool_ops->get_settings) { 170 struct ethtool_cmd cmd = { ETHTOOL_GSET }; 171 172 if (!netdev->ethtool_ops->get_settings(netdev, &cmd)) 173 ret = sprintf(buf, "%s\n", cmd.duplex ? "full" : "half"); 174 } 175 rtnl_unlock(); 176 return ret; 177 } 178 179 static ssize_t show_dormant(struct device *dev, 180 struct device_attribute *attr, char *buf) 181 { 182 struct net_device *netdev = to_net_dev(dev); 183 184 if (netif_running(netdev)) 185 return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); 186 187 return -EINVAL; 188 } 189 190 static const char *const operstates[] = { 191 "unknown", 192 "notpresent", /* currently unused */ 193 "down", 194 "lowerlayerdown", 195 "testing", /* currently unused */ 196 "dormant", 197 "up" 198 }; 199 200 static ssize_t show_operstate(struct device *dev, 201 struct device_attribute *attr, char *buf) 202 { 203 const struct net_device *netdev = to_net_dev(dev); 204 unsigned char operstate; 205 206 read_lock(&dev_base_lock); 207 operstate = netdev->operstate; 208 if (!netif_running(netdev)) 209 operstate = IF_OPER_DOWN; 210 read_unlock(&dev_base_lock); 211 212 if (operstate >= ARRAY_SIZE(operstates)) 213 return -EINVAL; /* should not happen */ 214 215 return sprintf(buf, "%s\n", operstates[operstate]); 216 } 217 218 /* read-write attributes */ 219 NETDEVICE_SHOW(mtu, fmt_dec); 220 221 static int change_mtu(struct net_device *net, unsigned long new_mtu) 222 { 223 return dev_set_mtu(net, (int) new_mtu); 224 } 225 226 static ssize_t store_mtu(struct device *dev, struct device_attribute *attr, 227 const char *buf, size_t len) 228 { 229 return netdev_store(dev, attr, buf, len, change_mtu); 230 } 231 232 NETDEVICE_SHOW(flags, fmt_hex); 233 234 static int change_flags(struct net_device *net, unsigned long new_flags) 235 { 236 return dev_change_flags(net, (unsigned) new_flags); 237 } 238 239 static ssize_t store_flags(struct device *dev, struct device_attribute *attr, 240 const char *buf, size_t len) 241 { 242 return netdev_store(dev, attr, buf, len, change_flags); 243 } 244 245 NETDEVICE_SHOW(tx_queue_len, fmt_ulong); 246 247 static int change_tx_queue_len(struct net_device *net, unsigned long new_len) 248 { 249 net->tx_queue_len = new_len; 250 return 0; 251 } 252 253 static ssize_t store_tx_queue_len(struct device *dev, 254 struct device_attribute *attr, 255 const char *buf, size_t len) 256 { 257 return netdev_store(dev, attr, buf, len, change_tx_queue_len); 258 } 259 260 static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr, 261 const char *buf, size_t len) 262 { 263 struct net_device *netdev = to_net_dev(dev); 264 size_t count = len; 265 ssize_t ret; 266 267 if (!capable(CAP_NET_ADMIN)) 268 return -EPERM; 269 270 /* ignore trailing newline */ 271 if (len > 0 && buf[len - 1] == '\n') 272 --count; 273 274 if (!rtnl_trylock()) 275 return restart_syscall(); 276 ret = dev_set_alias(netdev, buf, count); 277 rtnl_unlock(); 278 279 return ret < 0 ? ret : len; 280 } 281 282 static ssize_t show_ifalias(struct device *dev, 283 struct device_attribute *attr, char *buf) 284 { 285 const struct net_device *netdev = to_net_dev(dev); 286 ssize_t ret = 0; 287 288 if (!rtnl_trylock()) 289 return restart_syscall(); 290 if (netdev->ifalias) 291 ret = sprintf(buf, "%s\n", netdev->ifalias); 292 rtnl_unlock(); 293 return ret; 294 } 295 296 static struct device_attribute net_class_attributes[] = { 297 __ATTR(addr_len, S_IRUGO, show_addr_len, NULL), 298 __ATTR(dev_id, S_IRUGO, show_dev_id, NULL), 299 __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias), 300 __ATTR(iflink, S_IRUGO, show_iflink, NULL), 301 __ATTR(ifindex, S_IRUGO, show_ifindex, NULL), 302 __ATTR(features, S_IRUGO, show_features, NULL), 303 __ATTR(type, S_IRUGO, show_type, NULL), 304 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL), 305 __ATTR(address, S_IRUGO, show_address, NULL), 306 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL), 307 __ATTR(carrier, S_IRUGO, show_carrier, NULL), 308 __ATTR(speed, S_IRUGO, show_speed, NULL), 309 __ATTR(duplex, S_IRUGO, show_duplex, NULL), 310 __ATTR(dormant, S_IRUGO, show_dormant, NULL), 311 __ATTR(operstate, S_IRUGO, show_operstate, NULL), 312 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu), 313 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags), 314 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len, 315 store_tx_queue_len), 316 {} 317 }; 318 319 /* Show a given an attribute in the statistics group */ 320 static ssize_t netstat_show(const struct device *d, 321 struct device_attribute *attr, char *buf, 322 unsigned long offset) 323 { 324 struct net_device *dev = to_net_dev(d); 325 ssize_t ret = -EINVAL; 326 327 WARN_ON(offset > sizeof(struct net_device_stats) || 328 offset % sizeof(unsigned long) != 0); 329 330 read_lock(&dev_base_lock); 331 if (dev_isalive(dev)) { 332 const struct net_device_stats *stats = dev_get_stats(dev); 333 ret = sprintf(buf, fmt_ulong, 334 *(unsigned long *)(((u8 *) stats) + offset)); 335 } 336 read_unlock(&dev_base_lock); 337 return ret; 338 } 339 340 /* generate a read-only statistics attribute */ 341 #define NETSTAT_ENTRY(name) \ 342 static ssize_t show_##name(struct device *d, \ 343 struct device_attribute *attr, char *buf) \ 344 { \ 345 return netstat_show(d, attr, buf, \ 346 offsetof(struct net_device_stats, name)); \ 347 } \ 348 static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) 349 350 NETSTAT_ENTRY(rx_packets); 351 NETSTAT_ENTRY(tx_packets); 352 NETSTAT_ENTRY(rx_bytes); 353 NETSTAT_ENTRY(tx_bytes); 354 NETSTAT_ENTRY(rx_errors); 355 NETSTAT_ENTRY(tx_errors); 356 NETSTAT_ENTRY(rx_dropped); 357 NETSTAT_ENTRY(tx_dropped); 358 NETSTAT_ENTRY(multicast); 359 NETSTAT_ENTRY(collisions); 360 NETSTAT_ENTRY(rx_length_errors); 361 NETSTAT_ENTRY(rx_over_errors); 362 NETSTAT_ENTRY(rx_crc_errors); 363 NETSTAT_ENTRY(rx_frame_errors); 364 NETSTAT_ENTRY(rx_fifo_errors); 365 NETSTAT_ENTRY(rx_missed_errors); 366 NETSTAT_ENTRY(tx_aborted_errors); 367 NETSTAT_ENTRY(tx_carrier_errors); 368 NETSTAT_ENTRY(tx_fifo_errors); 369 NETSTAT_ENTRY(tx_heartbeat_errors); 370 NETSTAT_ENTRY(tx_window_errors); 371 NETSTAT_ENTRY(rx_compressed); 372 NETSTAT_ENTRY(tx_compressed); 373 374 static struct attribute *netstat_attrs[] = { 375 &dev_attr_rx_packets.attr, 376 &dev_attr_tx_packets.attr, 377 &dev_attr_rx_bytes.attr, 378 &dev_attr_tx_bytes.attr, 379 &dev_attr_rx_errors.attr, 380 &dev_attr_tx_errors.attr, 381 &dev_attr_rx_dropped.attr, 382 &dev_attr_tx_dropped.attr, 383 &dev_attr_multicast.attr, 384 &dev_attr_collisions.attr, 385 &dev_attr_rx_length_errors.attr, 386 &dev_attr_rx_over_errors.attr, 387 &dev_attr_rx_crc_errors.attr, 388 &dev_attr_rx_frame_errors.attr, 389 &dev_attr_rx_fifo_errors.attr, 390 &dev_attr_rx_missed_errors.attr, 391 &dev_attr_tx_aborted_errors.attr, 392 &dev_attr_tx_carrier_errors.attr, 393 &dev_attr_tx_fifo_errors.attr, 394 &dev_attr_tx_heartbeat_errors.attr, 395 &dev_attr_tx_window_errors.attr, 396 &dev_attr_rx_compressed.attr, 397 &dev_attr_tx_compressed.attr, 398 NULL 399 }; 400 401 402 static struct attribute_group netstat_group = { 403 .name = "statistics", 404 .attrs = netstat_attrs, 405 }; 406 407 #ifdef CONFIG_WIRELESS_EXT_SYSFS 408 /* helper function that does all the locking etc for wireless stats */ 409 static ssize_t wireless_show(struct device *d, char *buf, 410 ssize_t (*format)(const struct iw_statistics *, 411 char *)) 412 { 413 struct net_device *dev = to_net_dev(d); 414 const struct iw_statistics *iw; 415 ssize_t ret = -EINVAL; 416 417 if (!rtnl_trylock()) 418 return restart_syscall(); 419 if (dev_isalive(dev)) { 420 iw = get_wireless_stats(dev); 421 if (iw) 422 ret = (*format)(iw, buf); 423 } 424 rtnl_unlock(); 425 426 return ret; 427 } 428 429 /* show function template for wireless fields */ 430 #define WIRELESS_SHOW(name, field, format_string) \ 431 static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \ 432 { \ 433 return sprintf(buf, format_string, iw->field); \ 434 } \ 435 static ssize_t show_iw_##name(struct device *d, \ 436 struct device_attribute *attr, char *buf) \ 437 { \ 438 return wireless_show(d, buf, format_iw_##name); \ 439 } \ 440 static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL) 441 442 WIRELESS_SHOW(status, status, fmt_hex); 443 WIRELESS_SHOW(link, qual.qual, fmt_dec); 444 WIRELESS_SHOW(level, qual.level, fmt_dec); 445 WIRELESS_SHOW(noise, qual.noise, fmt_dec); 446 WIRELESS_SHOW(nwid, discard.nwid, fmt_dec); 447 WIRELESS_SHOW(crypt, discard.code, fmt_dec); 448 WIRELESS_SHOW(fragment, discard.fragment, fmt_dec); 449 WIRELESS_SHOW(misc, discard.misc, fmt_dec); 450 WIRELESS_SHOW(retries, discard.retries, fmt_dec); 451 WIRELESS_SHOW(beacon, miss.beacon, fmt_dec); 452 453 static struct attribute *wireless_attrs[] = { 454 &dev_attr_status.attr, 455 &dev_attr_link.attr, 456 &dev_attr_level.attr, 457 &dev_attr_noise.attr, 458 &dev_attr_nwid.attr, 459 &dev_attr_crypt.attr, 460 &dev_attr_fragment.attr, 461 &dev_attr_retries.attr, 462 &dev_attr_misc.attr, 463 &dev_attr_beacon.attr, 464 NULL 465 }; 466 467 static struct attribute_group wireless_group = { 468 .name = "wireless", 469 .attrs = wireless_attrs, 470 }; 471 #endif 472 #endif /* CONFIG_SYSFS */ 473 474 #ifdef CONFIG_RPS 475 /* 476 * RX queue sysfs structures and functions. 477 */ 478 struct rx_queue_attribute { 479 struct attribute attr; 480 ssize_t (*show)(struct netdev_rx_queue *queue, 481 struct rx_queue_attribute *attr, char *buf); 482 ssize_t (*store)(struct netdev_rx_queue *queue, 483 struct rx_queue_attribute *attr, const char *buf, size_t len); 484 }; 485 #define to_rx_queue_attr(_attr) container_of(_attr, \ 486 struct rx_queue_attribute, attr) 487 488 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 489 490 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 491 char *buf) 492 { 493 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 494 struct netdev_rx_queue *queue = to_rx_queue(kobj); 495 496 if (!attribute->show) 497 return -EIO; 498 499 return attribute->show(queue, attribute, buf); 500 } 501 502 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 503 const char *buf, size_t count) 504 { 505 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 506 struct netdev_rx_queue *queue = to_rx_queue(kobj); 507 508 if (!attribute->store) 509 return -EIO; 510 511 return attribute->store(queue, attribute, buf, count); 512 } 513 514 static struct sysfs_ops rx_queue_sysfs_ops = { 515 .show = rx_queue_attr_show, 516 .store = rx_queue_attr_store, 517 }; 518 519 static ssize_t show_rps_map(struct netdev_rx_queue *queue, 520 struct rx_queue_attribute *attribute, char *buf) 521 { 522 struct rps_map *map; 523 cpumask_var_t mask; 524 size_t len = 0; 525 int i; 526 527 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 528 return -ENOMEM; 529 530 rcu_read_lock(); 531 map = rcu_dereference(queue->rps_map); 532 if (map) 533 for (i = 0; i < map->len; i++) 534 cpumask_set_cpu(map->cpus[i], mask); 535 536 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask); 537 if (PAGE_SIZE - len < 3) { 538 rcu_read_unlock(); 539 free_cpumask_var(mask); 540 return -EINVAL; 541 } 542 rcu_read_unlock(); 543 544 free_cpumask_var(mask); 545 len += sprintf(buf + len, "\n"); 546 return len; 547 } 548 549 static void rps_map_release(struct rcu_head *rcu) 550 { 551 struct rps_map *map = container_of(rcu, struct rps_map, rcu); 552 553 kfree(map); 554 } 555 556 static ssize_t store_rps_map(struct netdev_rx_queue *queue, 557 struct rx_queue_attribute *attribute, 558 const char *buf, size_t len) 559 { 560 struct rps_map *old_map, *map; 561 cpumask_var_t mask; 562 int err, cpu, i; 563 static DEFINE_SPINLOCK(rps_map_lock); 564 565 if (!capable(CAP_NET_ADMIN)) 566 return -EPERM; 567 568 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 569 return -ENOMEM; 570 571 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 572 if (err) { 573 free_cpumask_var(mask); 574 return err; 575 } 576 577 map = kzalloc(max_t(unsigned, 578 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 579 GFP_KERNEL); 580 if (!map) { 581 free_cpumask_var(mask); 582 return -ENOMEM; 583 } 584 585 i = 0; 586 for_each_cpu_and(cpu, mask, cpu_online_mask) 587 map->cpus[i++] = cpu; 588 589 if (i) 590 map->len = i; 591 else { 592 kfree(map); 593 map = NULL; 594 } 595 596 spin_lock(&rps_map_lock); 597 old_map = queue->rps_map; 598 rcu_assign_pointer(queue->rps_map, map); 599 spin_unlock(&rps_map_lock); 600 601 if (old_map) 602 call_rcu(&old_map->rcu, rps_map_release); 603 604 free_cpumask_var(mask); 605 return len; 606 } 607 608 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 609 struct rx_queue_attribute *attr, 610 char *buf) 611 { 612 struct rps_dev_flow_table *flow_table; 613 unsigned int val = 0; 614 615 rcu_read_lock(); 616 flow_table = rcu_dereference(queue->rps_flow_table); 617 if (flow_table) 618 val = flow_table->mask + 1; 619 rcu_read_unlock(); 620 621 return sprintf(buf, "%u\n", val); 622 } 623 624 static void rps_dev_flow_table_release_work(struct work_struct *work) 625 { 626 struct rps_dev_flow_table *table = container_of(work, 627 struct rps_dev_flow_table, free_work); 628 629 vfree(table); 630 } 631 632 static void rps_dev_flow_table_release(struct rcu_head *rcu) 633 { 634 struct rps_dev_flow_table *table = container_of(rcu, 635 struct rps_dev_flow_table, rcu); 636 637 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work); 638 schedule_work(&table->free_work); 639 } 640 641 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 642 struct rx_queue_attribute *attr, 643 const char *buf, size_t len) 644 { 645 unsigned int count; 646 char *endp; 647 struct rps_dev_flow_table *table, *old_table; 648 static DEFINE_SPINLOCK(rps_dev_flow_lock); 649 650 if (!capable(CAP_NET_ADMIN)) 651 return -EPERM; 652 653 count = simple_strtoul(buf, &endp, 0); 654 if (endp == buf) 655 return -EINVAL; 656 657 if (count) { 658 int i; 659 660 if (count > 1<<30) { 661 /* Enforce a limit to prevent overflow */ 662 return -EINVAL; 663 } 664 count = roundup_pow_of_two(count); 665 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count)); 666 if (!table) 667 return -ENOMEM; 668 669 table->mask = count - 1; 670 for (i = 0; i < count; i++) 671 table->flows[i].cpu = RPS_NO_CPU; 672 } else 673 table = NULL; 674 675 spin_lock(&rps_dev_flow_lock); 676 old_table = queue->rps_flow_table; 677 rcu_assign_pointer(queue->rps_flow_table, table); 678 spin_unlock(&rps_dev_flow_lock); 679 680 if (old_table) 681 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 682 683 return len; 684 } 685 686 static struct rx_queue_attribute rps_cpus_attribute = 687 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); 688 689 690 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = 691 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, 692 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 693 694 static struct attribute *rx_queue_default_attrs[] = { 695 &rps_cpus_attribute.attr, 696 &rps_dev_flow_table_cnt_attribute.attr, 697 NULL 698 }; 699 700 static void rx_queue_release(struct kobject *kobj) 701 { 702 struct netdev_rx_queue *queue = to_rx_queue(kobj); 703 struct netdev_rx_queue *first = queue->first; 704 705 if (queue->rps_map) 706 call_rcu(&queue->rps_map->rcu, rps_map_release); 707 708 if (queue->rps_flow_table) 709 call_rcu(&queue->rps_flow_table->rcu, 710 rps_dev_flow_table_release); 711 712 if (atomic_dec_and_test(&first->count)) 713 kfree(first); 714 } 715 716 static struct kobj_type rx_queue_ktype = { 717 .sysfs_ops = &rx_queue_sysfs_ops, 718 .release = rx_queue_release, 719 .default_attrs = rx_queue_default_attrs, 720 }; 721 722 static int rx_queue_add_kobject(struct net_device *net, int index) 723 { 724 struct netdev_rx_queue *queue = net->_rx + index; 725 struct kobject *kobj = &queue->kobj; 726 int error = 0; 727 728 kobj->kset = net->queues_kset; 729 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 730 "rx-%u", index); 731 if (error) { 732 kobject_put(kobj); 733 return error; 734 } 735 736 kobject_uevent(kobj, KOBJ_ADD); 737 738 return error; 739 } 740 741 static int rx_queue_register_kobjects(struct net_device *net) 742 { 743 int i; 744 int error = 0; 745 746 net->queues_kset = kset_create_and_add("queues", 747 NULL, &net->dev.kobj); 748 if (!net->queues_kset) 749 return -ENOMEM; 750 for (i = 0; i < net->num_rx_queues; i++) { 751 error = rx_queue_add_kobject(net, i); 752 if (error) 753 break; 754 } 755 756 if (error) 757 while (--i >= 0) 758 kobject_put(&net->_rx[i].kobj); 759 760 return error; 761 } 762 763 static void rx_queue_remove_kobjects(struct net_device *net) 764 { 765 int i; 766 767 for (i = 0; i < net->num_rx_queues; i++) 768 kobject_put(&net->_rx[i].kobj); 769 kset_unregister(net->queues_kset); 770 } 771 #endif /* CONFIG_RPS */ 772 773 static const void *net_current_ns(void) 774 { 775 return current->nsproxy->net_ns; 776 } 777 778 static const void *net_initial_ns(void) 779 { 780 return &init_net; 781 } 782 783 static const void *net_netlink_ns(struct sock *sk) 784 { 785 return sock_net(sk); 786 } 787 788 static struct kobj_ns_type_operations net_ns_type_operations = { 789 .type = KOBJ_NS_TYPE_NET, 790 .current_ns = net_current_ns, 791 .netlink_ns = net_netlink_ns, 792 .initial_ns = net_initial_ns, 793 }; 794 795 static void net_kobj_ns_exit(struct net *net) 796 { 797 kobj_ns_exit(KOBJ_NS_TYPE_NET, net); 798 } 799 800 static struct pernet_operations kobj_net_ops = { 801 .exit = net_kobj_ns_exit, 802 }; 803 804 805 #ifdef CONFIG_HOTPLUG 806 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 807 { 808 struct net_device *dev = to_net_dev(d); 809 int retval; 810 811 /* pass interface to uevent. */ 812 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 813 if (retval) 814 goto exit; 815 816 /* pass ifindex to uevent. 817 * ifindex is useful as it won't change (interface name may change) 818 * and is what RtNetlink uses natively. */ 819 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 820 821 exit: 822 return retval; 823 } 824 #endif 825 826 /* 827 * netdev_release -- destroy and free a dead device. 828 * Called when last reference to device kobject is gone. 829 */ 830 static void netdev_release(struct device *d) 831 { 832 struct net_device *dev = to_net_dev(d); 833 834 BUG_ON(dev->reg_state != NETREG_RELEASED); 835 836 kfree(dev->ifalias); 837 kfree((char *)dev - dev->padded); 838 } 839 840 static const void *net_namespace(struct device *d) 841 { 842 struct net_device *dev; 843 dev = container_of(d, struct net_device, dev); 844 return dev_net(dev); 845 } 846 847 static struct class net_class = { 848 .name = "net", 849 .dev_release = netdev_release, 850 #ifdef CONFIG_SYSFS 851 .dev_attrs = net_class_attributes, 852 #endif /* CONFIG_SYSFS */ 853 #ifdef CONFIG_HOTPLUG 854 .dev_uevent = netdev_uevent, 855 #endif 856 .ns_type = &net_ns_type_operations, 857 .namespace = net_namespace, 858 }; 859 860 /* Delete sysfs entries but hold kobject reference until after all 861 * netdev references are gone. 862 */ 863 void netdev_unregister_kobject(struct net_device * net) 864 { 865 struct device *dev = &(net->dev); 866 867 kobject_get(&dev->kobj); 868 869 #ifdef CONFIG_RPS 870 rx_queue_remove_kobjects(net); 871 #endif 872 873 device_del(dev); 874 } 875 876 /* Create sysfs entries for network device. */ 877 int netdev_register_kobject(struct net_device *net) 878 { 879 struct device *dev = &(net->dev); 880 const struct attribute_group **groups = net->sysfs_groups; 881 int error = 0; 882 883 device_initialize(dev); 884 dev->class = &net_class; 885 dev->platform_data = net; 886 dev->groups = groups; 887 888 dev_set_name(dev, "%s", net->name); 889 890 #ifdef CONFIG_SYSFS 891 /* Allow for a device specific group */ 892 if (*groups) 893 groups++; 894 895 *groups++ = &netstat_group; 896 #ifdef CONFIG_WIRELESS_EXT_SYSFS 897 if (net->ieee80211_ptr) 898 *groups++ = &wireless_group; 899 #ifdef CONFIG_WIRELESS_EXT 900 else if (net->wireless_handlers) 901 *groups++ = &wireless_group; 902 #endif 903 #endif 904 #endif /* CONFIG_SYSFS */ 905 906 error = device_add(dev); 907 if (error) 908 return error; 909 910 #ifdef CONFIG_RPS 911 error = rx_queue_register_kobjects(net); 912 if (error) { 913 device_del(dev); 914 return error; 915 } 916 #endif 917 918 return error; 919 } 920 921 int netdev_class_create_file(struct class_attribute *class_attr) 922 { 923 return class_create_file(&net_class, class_attr); 924 } 925 926 void netdev_class_remove_file(struct class_attribute *class_attr) 927 { 928 class_remove_file(&net_class, class_attr); 929 } 930 931 EXPORT_SYMBOL(netdev_class_create_file); 932 EXPORT_SYMBOL(netdev_class_remove_file); 933 934 int netdev_kobject_init(void) 935 { 936 kobj_ns_type_register(&net_ns_type_operations); 937 register_pernet_subsys(&kobj_net_ops); 938 return class_register(&net_class); 939 } 940