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 <net/switchdev.h> 16 #include <linux/if_arp.h> 17 #include <linux/slab.h> 18 #include <linux/nsproxy.h> 19 #include <net/sock.h> 20 #include <net/net_namespace.h> 21 #include <linux/rtnetlink.h> 22 #include <linux/vmalloc.h> 23 #include <linux/export.h> 24 #include <linux/jiffies.h> 25 #include <linux/pm_runtime.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 *ndev = to_net_dev(dev); 48 ssize_t ret = -EINVAL; 49 50 read_lock(&dev_base_lock); 51 if (dev_isalive(ndev)) 52 ret = (*format)(ndev, 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 *dev, char *buf) \ 61 { \ 62 return sprintf(buf, format_string, dev->field); \ 63 } \ 64 static ssize_t field##_show(struct device *dev, \ 65 struct device_attribute *attr, char *buf) \ 66 { \ 67 return netdev_show(dev, attr, buf, format_##field); \ 68 } \ 69 70 #define NETDEVICE_SHOW_RO(field, format_string) \ 71 NETDEVICE_SHOW(field, format_string); \ 72 static DEVICE_ATTR_RO(field) 73 74 #define NETDEVICE_SHOW_RW(field, format_string) \ 75 NETDEVICE_SHOW(field, format_string); \ 76 static DEVICE_ATTR_RW(field) 77 78 /* use same locking and permission rules as SIF* ioctl's */ 79 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, 80 const char *buf, size_t len, 81 int (*set)(struct net_device *, unsigned long)) 82 { 83 struct net_device *netdev = to_net_dev(dev); 84 struct net *net = dev_net(netdev); 85 unsigned long new; 86 int ret = -EINVAL; 87 88 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 89 return -EPERM; 90 91 ret = kstrtoul(buf, 0, &new); 92 if (ret) 93 goto err; 94 95 if (!rtnl_trylock()) 96 return restart_syscall(); 97 98 if (dev_isalive(netdev)) { 99 if ((ret = (*set)(netdev, new)) == 0) 100 ret = len; 101 } 102 rtnl_unlock(); 103 err: 104 return ret; 105 } 106 107 NETDEVICE_SHOW_RO(dev_id, fmt_hex); 108 NETDEVICE_SHOW_RO(dev_port, fmt_dec); 109 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec); 110 NETDEVICE_SHOW_RO(addr_len, fmt_dec); 111 NETDEVICE_SHOW_RO(iflink, fmt_dec); 112 NETDEVICE_SHOW_RO(ifindex, fmt_dec); 113 NETDEVICE_SHOW_RO(type, fmt_dec); 114 NETDEVICE_SHOW_RO(link_mode, fmt_dec); 115 116 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf) 117 { 118 return sprintf(buf, fmt_dec, dev->name_assign_type); 119 } 120 121 static ssize_t name_assign_type_show(struct device *dev, 122 struct device_attribute *attr, 123 char *buf) 124 { 125 struct net_device *ndev = to_net_dev(dev); 126 ssize_t ret = -EINVAL; 127 128 if (ndev->name_assign_type != NET_NAME_UNKNOWN) 129 ret = netdev_show(dev, attr, buf, format_name_assign_type); 130 131 return ret; 132 } 133 static DEVICE_ATTR_RO(name_assign_type); 134 135 /* use same locking rules as GIFHWADDR ioctl's */ 136 static ssize_t address_show(struct device *dev, struct device_attribute *attr, 137 char *buf) 138 { 139 struct net_device *ndev = to_net_dev(dev); 140 ssize_t ret = -EINVAL; 141 142 read_lock(&dev_base_lock); 143 if (dev_isalive(ndev)) 144 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len); 145 read_unlock(&dev_base_lock); 146 return ret; 147 } 148 static DEVICE_ATTR_RO(address); 149 150 static ssize_t broadcast_show(struct device *dev, 151 struct device_attribute *attr, char *buf) 152 { 153 struct net_device *ndev = to_net_dev(dev); 154 if (dev_isalive(ndev)) 155 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len); 156 return -EINVAL; 157 } 158 static DEVICE_ATTR_RO(broadcast); 159 160 static int change_carrier(struct net_device *dev, unsigned long new_carrier) 161 { 162 if (!netif_running(dev)) 163 return -EINVAL; 164 return dev_change_carrier(dev, (bool) new_carrier); 165 } 166 167 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr, 168 const char *buf, size_t len) 169 { 170 return netdev_store(dev, attr, buf, len, change_carrier); 171 } 172 173 static ssize_t carrier_show(struct device *dev, 174 struct device_attribute *attr, char *buf) 175 { 176 struct net_device *netdev = to_net_dev(dev); 177 if (netif_running(netdev)) { 178 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); 179 } 180 return -EINVAL; 181 } 182 static DEVICE_ATTR_RW(carrier); 183 184 static ssize_t speed_show(struct device *dev, 185 struct device_attribute *attr, char *buf) 186 { 187 struct net_device *netdev = to_net_dev(dev); 188 int ret = -EINVAL; 189 190 if (!rtnl_trylock()) 191 return restart_syscall(); 192 193 if (netif_running(netdev)) { 194 struct ethtool_cmd cmd; 195 if (!__ethtool_get_settings(netdev, &cmd)) 196 ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd)); 197 } 198 rtnl_unlock(); 199 return ret; 200 } 201 static DEVICE_ATTR_RO(speed); 202 203 static ssize_t duplex_show(struct device *dev, 204 struct device_attribute *attr, char *buf) 205 { 206 struct net_device *netdev = to_net_dev(dev); 207 int ret = -EINVAL; 208 209 if (!rtnl_trylock()) 210 return restart_syscall(); 211 212 if (netif_running(netdev)) { 213 struct ethtool_cmd cmd; 214 if (!__ethtool_get_settings(netdev, &cmd)) { 215 const char *duplex; 216 switch (cmd.duplex) { 217 case DUPLEX_HALF: 218 duplex = "half"; 219 break; 220 case DUPLEX_FULL: 221 duplex = "full"; 222 break; 223 default: 224 duplex = "unknown"; 225 break; 226 } 227 ret = sprintf(buf, "%s\n", duplex); 228 } 229 } 230 rtnl_unlock(); 231 return ret; 232 } 233 static DEVICE_ATTR_RO(duplex); 234 235 static ssize_t dormant_show(struct device *dev, 236 struct device_attribute *attr, char *buf) 237 { 238 struct net_device *netdev = to_net_dev(dev); 239 240 if (netif_running(netdev)) 241 return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); 242 243 return -EINVAL; 244 } 245 static DEVICE_ATTR_RO(dormant); 246 247 static const char *const operstates[] = { 248 "unknown", 249 "notpresent", /* currently unused */ 250 "down", 251 "lowerlayerdown", 252 "testing", /* currently unused */ 253 "dormant", 254 "up" 255 }; 256 257 static ssize_t operstate_show(struct device *dev, 258 struct device_attribute *attr, char *buf) 259 { 260 const struct net_device *netdev = to_net_dev(dev); 261 unsigned char operstate; 262 263 read_lock(&dev_base_lock); 264 operstate = netdev->operstate; 265 if (!netif_running(netdev)) 266 operstate = IF_OPER_DOWN; 267 read_unlock(&dev_base_lock); 268 269 if (operstate >= ARRAY_SIZE(operstates)) 270 return -EINVAL; /* should not happen */ 271 272 return sprintf(buf, "%s\n", operstates[operstate]); 273 } 274 static DEVICE_ATTR_RO(operstate); 275 276 static ssize_t carrier_changes_show(struct device *dev, 277 struct device_attribute *attr, 278 char *buf) 279 { 280 struct net_device *netdev = to_net_dev(dev); 281 return sprintf(buf, fmt_dec, 282 atomic_read(&netdev->carrier_changes)); 283 } 284 static DEVICE_ATTR_RO(carrier_changes); 285 286 /* read-write attributes */ 287 288 static int change_mtu(struct net_device *dev, unsigned long new_mtu) 289 { 290 return dev_set_mtu(dev, (int) new_mtu); 291 } 292 293 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr, 294 const char *buf, size_t len) 295 { 296 return netdev_store(dev, attr, buf, len, change_mtu); 297 } 298 NETDEVICE_SHOW_RW(mtu, fmt_dec); 299 300 static int change_flags(struct net_device *dev, unsigned long new_flags) 301 { 302 return dev_change_flags(dev, (unsigned int) new_flags); 303 } 304 305 static ssize_t flags_store(struct device *dev, struct device_attribute *attr, 306 const char *buf, size_t len) 307 { 308 return netdev_store(dev, attr, buf, len, change_flags); 309 } 310 NETDEVICE_SHOW_RW(flags, fmt_hex); 311 312 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len) 313 { 314 dev->tx_queue_len = new_len; 315 return 0; 316 } 317 318 static ssize_t tx_queue_len_store(struct device *dev, 319 struct device_attribute *attr, 320 const char *buf, size_t len) 321 { 322 if (!capable(CAP_NET_ADMIN)) 323 return -EPERM; 324 325 return netdev_store(dev, attr, buf, len, change_tx_queue_len); 326 } 327 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong); 328 329 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val) 330 { 331 dev->gro_flush_timeout = val; 332 return 0; 333 } 334 335 static ssize_t gro_flush_timeout_store(struct device *dev, 336 struct device_attribute *attr, 337 const char *buf, size_t len) 338 { 339 if (!capable(CAP_NET_ADMIN)) 340 return -EPERM; 341 342 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout); 343 } 344 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong); 345 346 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr, 347 const char *buf, size_t len) 348 { 349 struct net_device *netdev = to_net_dev(dev); 350 struct net *net = dev_net(netdev); 351 size_t count = len; 352 ssize_t ret; 353 354 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 355 return -EPERM; 356 357 /* ignore trailing newline */ 358 if (len > 0 && buf[len - 1] == '\n') 359 --count; 360 361 if (!rtnl_trylock()) 362 return restart_syscall(); 363 ret = dev_set_alias(netdev, buf, count); 364 rtnl_unlock(); 365 366 return ret < 0 ? ret : len; 367 } 368 369 static ssize_t ifalias_show(struct device *dev, 370 struct device_attribute *attr, char *buf) 371 { 372 const struct net_device *netdev = to_net_dev(dev); 373 ssize_t ret = 0; 374 375 if (!rtnl_trylock()) 376 return restart_syscall(); 377 if (netdev->ifalias) 378 ret = sprintf(buf, "%s\n", netdev->ifalias); 379 rtnl_unlock(); 380 return ret; 381 } 382 static DEVICE_ATTR_RW(ifalias); 383 384 static int change_group(struct net_device *dev, unsigned long new_group) 385 { 386 dev_set_group(dev, (int) new_group); 387 return 0; 388 } 389 390 static ssize_t group_store(struct device *dev, struct device_attribute *attr, 391 const char *buf, size_t len) 392 { 393 return netdev_store(dev, attr, buf, len, change_group); 394 } 395 NETDEVICE_SHOW(group, fmt_dec); 396 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store); 397 398 static ssize_t phys_port_id_show(struct device *dev, 399 struct device_attribute *attr, char *buf) 400 { 401 struct net_device *netdev = to_net_dev(dev); 402 ssize_t ret = -EINVAL; 403 404 if (!rtnl_trylock()) 405 return restart_syscall(); 406 407 if (dev_isalive(netdev)) { 408 struct netdev_phys_item_id ppid; 409 410 ret = dev_get_phys_port_id(netdev, &ppid); 411 if (!ret) 412 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); 413 } 414 rtnl_unlock(); 415 416 return ret; 417 } 418 static DEVICE_ATTR_RO(phys_port_id); 419 420 static ssize_t phys_switch_id_show(struct device *dev, 421 struct device_attribute *attr, char *buf) 422 { 423 struct net_device *netdev = to_net_dev(dev); 424 ssize_t ret = -EINVAL; 425 426 if (!rtnl_trylock()) 427 return restart_syscall(); 428 429 if (dev_isalive(netdev)) { 430 struct netdev_phys_item_id ppid; 431 432 ret = netdev_switch_parent_id_get(netdev, &ppid); 433 if (!ret) 434 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); 435 } 436 rtnl_unlock(); 437 438 return ret; 439 } 440 static DEVICE_ATTR_RO(phys_switch_id); 441 442 static struct attribute *net_class_attrs[] = { 443 &dev_attr_netdev_group.attr, 444 &dev_attr_type.attr, 445 &dev_attr_dev_id.attr, 446 &dev_attr_dev_port.attr, 447 &dev_attr_iflink.attr, 448 &dev_attr_ifindex.attr, 449 &dev_attr_name_assign_type.attr, 450 &dev_attr_addr_assign_type.attr, 451 &dev_attr_addr_len.attr, 452 &dev_attr_link_mode.attr, 453 &dev_attr_address.attr, 454 &dev_attr_broadcast.attr, 455 &dev_attr_speed.attr, 456 &dev_attr_duplex.attr, 457 &dev_attr_dormant.attr, 458 &dev_attr_operstate.attr, 459 &dev_attr_carrier_changes.attr, 460 &dev_attr_ifalias.attr, 461 &dev_attr_carrier.attr, 462 &dev_attr_mtu.attr, 463 &dev_attr_flags.attr, 464 &dev_attr_tx_queue_len.attr, 465 &dev_attr_gro_flush_timeout.attr, 466 &dev_attr_phys_port_id.attr, 467 &dev_attr_phys_switch_id.attr, 468 NULL, 469 }; 470 ATTRIBUTE_GROUPS(net_class); 471 472 /* Show a given an attribute in the statistics group */ 473 static ssize_t netstat_show(const struct device *d, 474 struct device_attribute *attr, char *buf, 475 unsigned long offset) 476 { 477 struct net_device *dev = to_net_dev(d); 478 ssize_t ret = -EINVAL; 479 480 WARN_ON(offset > sizeof(struct rtnl_link_stats64) || 481 offset % sizeof(u64) != 0); 482 483 read_lock(&dev_base_lock); 484 if (dev_isalive(dev)) { 485 struct rtnl_link_stats64 temp; 486 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 487 488 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset)); 489 } 490 read_unlock(&dev_base_lock); 491 return ret; 492 } 493 494 /* generate a read-only statistics attribute */ 495 #define NETSTAT_ENTRY(name) \ 496 static ssize_t name##_show(struct device *d, \ 497 struct device_attribute *attr, char *buf) \ 498 { \ 499 return netstat_show(d, attr, buf, \ 500 offsetof(struct rtnl_link_stats64, name)); \ 501 } \ 502 static DEVICE_ATTR_RO(name) 503 504 NETSTAT_ENTRY(rx_packets); 505 NETSTAT_ENTRY(tx_packets); 506 NETSTAT_ENTRY(rx_bytes); 507 NETSTAT_ENTRY(tx_bytes); 508 NETSTAT_ENTRY(rx_errors); 509 NETSTAT_ENTRY(tx_errors); 510 NETSTAT_ENTRY(rx_dropped); 511 NETSTAT_ENTRY(tx_dropped); 512 NETSTAT_ENTRY(multicast); 513 NETSTAT_ENTRY(collisions); 514 NETSTAT_ENTRY(rx_length_errors); 515 NETSTAT_ENTRY(rx_over_errors); 516 NETSTAT_ENTRY(rx_crc_errors); 517 NETSTAT_ENTRY(rx_frame_errors); 518 NETSTAT_ENTRY(rx_fifo_errors); 519 NETSTAT_ENTRY(rx_missed_errors); 520 NETSTAT_ENTRY(tx_aborted_errors); 521 NETSTAT_ENTRY(tx_carrier_errors); 522 NETSTAT_ENTRY(tx_fifo_errors); 523 NETSTAT_ENTRY(tx_heartbeat_errors); 524 NETSTAT_ENTRY(tx_window_errors); 525 NETSTAT_ENTRY(rx_compressed); 526 NETSTAT_ENTRY(tx_compressed); 527 528 static struct attribute *netstat_attrs[] = { 529 &dev_attr_rx_packets.attr, 530 &dev_attr_tx_packets.attr, 531 &dev_attr_rx_bytes.attr, 532 &dev_attr_tx_bytes.attr, 533 &dev_attr_rx_errors.attr, 534 &dev_attr_tx_errors.attr, 535 &dev_attr_rx_dropped.attr, 536 &dev_attr_tx_dropped.attr, 537 &dev_attr_multicast.attr, 538 &dev_attr_collisions.attr, 539 &dev_attr_rx_length_errors.attr, 540 &dev_attr_rx_over_errors.attr, 541 &dev_attr_rx_crc_errors.attr, 542 &dev_attr_rx_frame_errors.attr, 543 &dev_attr_rx_fifo_errors.attr, 544 &dev_attr_rx_missed_errors.attr, 545 &dev_attr_tx_aborted_errors.attr, 546 &dev_attr_tx_carrier_errors.attr, 547 &dev_attr_tx_fifo_errors.attr, 548 &dev_attr_tx_heartbeat_errors.attr, 549 &dev_attr_tx_window_errors.attr, 550 &dev_attr_rx_compressed.attr, 551 &dev_attr_tx_compressed.attr, 552 NULL 553 }; 554 555 556 static struct attribute_group netstat_group = { 557 .name = "statistics", 558 .attrs = netstat_attrs, 559 }; 560 561 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 562 static struct attribute *wireless_attrs[] = { 563 NULL 564 }; 565 566 static struct attribute_group wireless_group = { 567 .name = "wireless", 568 .attrs = wireless_attrs, 569 }; 570 #endif 571 572 #else /* CONFIG_SYSFS */ 573 #define net_class_groups NULL 574 #endif /* CONFIG_SYSFS */ 575 576 #ifdef CONFIG_SYSFS 577 #define to_rx_queue_attr(_attr) container_of(_attr, \ 578 struct rx_queue_attribute, attr) 579 580 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 581 582 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 583 char *buf) 584 { 585 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 586 struct netdev_rx_queue *queue = to_rx_queue(kobj); 587 588 if (!attribute->show) 589 return -EIO; 590 591 return attribute->show(queue, attribute, buf); 592 } 593 594 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 595 const char *buf, size_t count) 596 { 597 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 598 struct netdev_rx_queue *queue = to_rx_queue(kobj); 599 600 if (!attribute->store) 601 return -EIO; 602 603 return attribute->store(queue, attribute, buf, count); 604 } 605 606 static const struct sysfs_ops rx_queue_sysfs_ops = { 607 .show = rx_queue_attr_show, 608 .store = rx_queue_attr_store, 609 }; 610 611 #ifdef CONFIG_RPS 612 static ssize_t show_rps_map(struct netdev_rx_queue *queue, 613 struct rx_queue_attribute *attribute, char *buf) 614 { 615 struct rps_map *map; 616 cpumask_var_t mask; 617 int i, len; 618 619 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 620 return -ENOMEM; 621 622 rcu_read_lock(); 623 map = rcu_dereference(queue->rps_map); 624 if (map) 625 for (i = 0; i < map->len; i++) 626 cpumask_set_cpu(map->cpus[i], mask); 627 628 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 629 rcu_read_unlock(); 630 free_cpumask_var(mask); 631 632 return len < PAGE_SIZE ? len : -EINVAL; 633 } 634 635 static ssize_t store_rps_map(struct netdev_rx_queue *queue, 636 struct rx_queue_attribute *attribute, 637 const char *buf, size_t len) 638 { 639 struct rps_map *old_map, *map; 640 cpumask_var_t mask; 641 int err, cpu, i; 642 static DEFINE_SPINLOCK(rps_map_lock); 643 644 if (!capable(CAP_NET_ADMIN)) 645 return -EPERM; 646 647 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 648 return -ENOMEM; 649 650 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 651 if (err) { 652 free_cpumask_var(mask); 653 return err; 654 } 655 656 map = kzalloc(max_t(unsigned int, 657 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 658 GFP_KERNEL); 659 if (!map) { 660 free_cpumask_var(mask); 661 return -ENOMEM; 662 } 663 664 i = 0; 665 for_each_cpu_and(cpu, mask, cpu_online_mask) 666 map->cpus[i++] = cpu; 667 668 if (i) 669 map->len = i; 670 else { 671 kfree(map); 672 map = NULL; 673 } 674 675 spin_lock(&rps_map_lock); 676 old_map = rcu_dereference_protected(queue->rps_map, 677 lockdep_is_held(&rps_map_lock)); 678 rcu_assign_pointer(queue->rps_map, map); 679 spin_unlock(&rps_map_lock); 680 681 if (map) 682 static_key_slow_inc(&rps_needed); 683 if (old_map) { 684 kfree_rcu(old_map, rcu); 685 static_key_slow_dec(&rps_needed); 686 } 687 free_cpumask_var(mask); 688 return len; 689 } 690 691 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 692 struct rx_queue_attribute *attr, 693 char *buf) 694 { 695 struct rps_dev_flow_table *flow_table; 696 unsigned long val = 0; 697 698 rcu_read_lock(); 699 flow_table = rcu_dereference(queue->rps_flow_table); 700 if (flow_table) 701 val = (unsigned long)flow_table->mask + 1; 702 rcu_read_unlock(); 703 704 return sprintf(buf, "%lu\n", val); 705 } 706 707 static void rps_dev_flow_table_release(struct rcu_head *rcu) 708 { 709 struct rps_dev_flow_table *table = container_of(rcu, 710 struct rps_dev_flow_table, rcu); 711 vfree(table); 712 } 713 714 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 715 struct rx_queue_attribute *attr, 716 const char *buf, size_t len) 717 { 718 unsigned long mask, count; 719 struct rps_dev_flow_table *table, *old_table; 720 static DEFINE_SPINLOCK(rps_dev_flow_lock); 721 int rc; 722 723 if (!capable(CAP_NET_ADMIN)) 724 return -EPERM; 725 726 rc = kstrtoul(buf, 0, &count); 727 if (rc < 0) 728 return rc; 729 730 if (count) { 731 mask = count - 1; 732 /* mask = roundup_pow_of_two(count) - 1; 733 * without overflows... 734 */ 735 while ((mask | (mask >> 1)) != mask) 736 mask |= (mask >> 1); 737 /* On 64 bit arches, must check mask fits in table->mask (u32), 738 * and on 32bit arches, must check 739 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow. 740 */ 741 #if BITS_PER_LONG > 32 742 if (mask > (unsigned long)(u32)mask) 743 return -EINVAL; 744 #else 745 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) 746 / sizeof(struct rps_dev_flow)) { 747 /* Enforce a limit to prevent overflow */ 748 return -EINVAL; 749 } 750 #endif 751 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); 752 if (!table) 753 return -ENOMEM; 754 755 table->mask = mask; 756 for (count = 0; count <= mask; count++) 757 table->flows[count].cpu = RPS_NO_CPU; 758 } else 759 table = NULL; 760 761 spin_lock(&rps_dev_flow_lock); 762 old_table = rcu_dereference_protected(queue->rps_flow_table, 763 lockdep_is_held(&rps_dev_flow_lock)); 764 rcu_assign_pointer(queue->rps_flow_table, table); 765 spin_unlock(&rps_dev_flow_lock); 766 767 if (old_table) 768 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 769 770 return len; 771 } 772 773 static struct rx_queue_attribute rps_cpus_attribute = 774 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); 775 776 777 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = 778 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, 779 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 780 #endif /* CONFIG_RPS */ 781 782 static struct attribute *rx_queue_default_attrs[] = { 783 #ifdef CONFIG_RPS 784 &rps_cpus_attribute.attr, 785 &rps_dev_flow_table_cnt_attribute.attr, 786 #endif 787 NULL 788 }; 789 790 static void rx_queue_release(struct kobject *kobj) 791 { 792 struct netdev_rx_queue *queue = to_rx_queue(kobj); 793 #ifdef CONFIG_RPS 794 struct rps_map *map; 795 struct rps_dev_flow_table *flow_table; 796 797 798 map = rcu_dereference_protected(queue->rps_map, 1); 799 if (map) { 800 RCU_INIT_POINTER(queue->rps_map, NULL); 801 kfree_rcu(map, rcu); 802 } 803 804 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); 805 if (flow_table) { 806 RCU_INIT_POINTER(queue->rps_flow_table, NULL); 807 call_rcu(&flow_table->rcu, rps_dev_flow_table_release); 808 } 809 #endif 810 811 memset(kobj, 0, sizeof(*kobj)); 812 dev_put(queue->dev); 813 } 814 815 static const void *rx_queue_namespace(struct kobject *kobj) 816 { 817 struct netdev_rx_queue *queue = to_rx_queue(kobj); 818 struct device *dev = &queue->dev->dev; 819 const void *ns = NULL; 820 821 if (dev->class && dev->class->ns_type) 822 ns = dev->class->namespace(dev); 823 824 return ns; 825 } 826 827 static struct kobj_type rx_queue_ktype = { 828 .sysfs_ops = &rx_queue_sysfs_ops, 829 .release = rx_queue_release, 830 .default_attrs = rx_queue_default_attrs, 831 .namespace = rx_queue_namespace 832 }; 833 834 static int rx_queue_add_kobject(struct net_device *dev, int index) 835 { 836 struct netdev_rx_queue *queue = dev->_rx + index; 837 struct kobject *kobj = &queue->kobj; 838 int error = 0; 839 840 kobj->kset = dev->queues_kset; 841 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 842 "rx-%u", index); 843 if (error) 844 goto exit; 845 846 if (dev->sysfs_rx_queue_group) { 847 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); 848 if (error) 849 goto exit; 850 } 851 852 kobject_uevent(kobj, KOBJ_ADD); 853 dev_hold(queue->dev); 854 855 return error; 856 exit: 857 kobject_put(kobj); 858 return error; 859 } 860 #endif /* CONFIG_SYSFS */ 861 862 int 863 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 864 { 865 #ifdef CONFIG_SYSFS 866 int i; 867 int error = 0; 868 869 #ifndef CONFIG_RPS 870 if (!dev->sysfs_rx_queue_group) 871 return 0; 872 #endif 873 for (i = old_num; i < new_num; i++) { 874 error = rx_queue_add_kobject(dev, i); 875 if (error) { 876 new_num = old_num; 877 break; 878 } 879 } 880 881 while (--i >= new_num) { 882 if (dev->sysfs_rx_queue_group) 883 sysfs_remove_group(&dev->_rx[i].kobj, 884 dev->sysfs_rx_queue_group); 885 kobject_put(&dev->_rx[i].kobj); 886 } 887 888 return error; 889 #else 890 return 0; 891 #endif 892 } 893 894 #ifdef CONFIG_SYSFS 895 /* 896 * netdev_queue sysfs structures and functions. 897 */ 898 struct netdev_queue_attribute { 899 struct attribute attr; 900 ssize_t (*show)(struct netdev_queue *queue, 901 struct netdev_queue_attribute *attr, char *buf); 902 ssize_t (*store)(struct netdev_queue *queue, 903 struct netdev_queue_attribute *attr, const char *buf, size_t len); 904 }; 905 #define to_netdev_queue_attr(_attr) container_of(_attr, \ 906 struct netdev_queue_attribute, attr) 907 908 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) 909 910 static ssize_t netdev_queue_attr_show(struct kobject *kobj, 911 struct attribute *attr, char *buf) 912 { 913 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 914 struct netdev_queue *queue = to_netdev_queue(kobj); 915 916 if (!attribute->show) 917 return -EIO; 918 919 return attribute->show(queue, attribute, buf); 920 } 921 922 static ssize_t netdev_queue_attr_store(struct kobject *kobj, 923 struct attribute *attr, 924 const char *buf, size_t count) 925 { 926 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 927 struct netdev_queue *queue = to_netdev_queue(kobj); 928 929 if (!attribute->store) 930 return -EIO; 931 932 return attribute->store(queue, attribute, buf, count); 933 } 934 935 static const struct sysfs_ops netdev_queue_sysfs_ops = { 936 .show = netdev_queue_attr_show, 937 .store = netdev_queue_attr_store, 938 }; 939 940 static ssize_t show_trans_timeout(struct netdev_queue *queue, 941 struct netdev_queue_attribute *attribute, 942 char *buf) 943 { 944 unsigned long trans_timeout; 945 946 spin_lock_irq(&queue->_xmit_lock); 947 trans_timeout = queue->trans_timeout; 948 spin_unlock_irq(&queue->_xmit_lock); 949 950 return sprintf(buf, "%lu", trans_timeout); 951 } 952 953 static struct netdev_queue_attribute queue_trans_timeout = 954 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL); 955 956 #ifdef CONFIG_BQL 957 /* 958 * Byte queue limits sysfs structures and functions. 959 */ 960 static ssize_t bql_show(char *buf, unsigned int value) 961 { 962 return sprintf(buf, "%u\n", value); 963 } 964 965 static ssize_t bql_set(const char *buf, const size_t count, 966 unsigned int *pvalue) 967 { 968 unsigned int value; 969 int err; 970 971 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) 972 value = DQL_MAX_LIMIT; 973 else { 974 err = kstrtouint(buf, 10, &value); 975 if (err < 0) 976 return err; 977 if (value > DQL_MAX_LIMIT) 978 return -EINVAL; 979 } 980 981 *pvalue = value; 982 983 return count; 984 } 985 986 static ssize_t bql_show_hold_time(struct netdev_queue *queue, 987 struct netdev_queue_attribute *attr, 988 char *buf) 989 { 990 struct dql *dql = &queue->dql; 991 992 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); 993 } 994 995 static ssize_t bql_set_hold_time(struct netdev_queue *queue, 996 struct netdev_queue_attribute *attribute, 997 const char *buf, size_t len) 998 { 999 struct dql *dql = &queue->dql; 1000 unsigned int value; 1001 int err; 1002 1003 err = kstrtouint(buf, 10, &value); 1004 if (err < 0) 1005 return err; 1006 1007 dql->slack_hold_time = msecs_to_jiffies(value); 1008 1009 return len; 1010 } 1011 1012 static struct netdev_queue_attribute bql_hold_time_attribute = 1013 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time, 1014 bql_set_hold_time); 1015 1016 static ssize_t bql_show_inflight(struct netdev_queue *queue, 1017 struct netdev_queue_attribute *attr, 1018 char *buf) 1019 { 1020 struct dql *dql = &queue->dql; 1021 1022 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); 1023 } 1024 1025 static struct netdev_queue_attribute bql_inflight_attribute = 1026 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL); 1027 1028 #define BQL_ATTR(NAME, FIELD) \ 1029 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ 1030 struct netdev_queue_attribute *attr, \ 1031 char *buf) \ 1032 { \ 1033 return bql_show(buf, queue->dql.FIELD); \ 1034 } \ 1035 \ 1036 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ 1037 struct netdev_queue_attribute *attr, \ 1038 const char *buf, size_t len) \ 1039 { \ 1040 return bql_set(buf, len, &queue->dql.FIELD); \ 1041 } \ 1042 \ 1043 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \ 1044 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \ 1045 bql_set_ ## NAME); 1046 1047 BQL_ATTR(limit, limit) 1048 BQL_ATTR(limit_max, max_limit) 1049 BQL_ATTR(limit_min, min_limit) 1050 1051 static struct attribute *dql_attrs[] = { 1052 &bql_limit_attribute.attr, 1053 &bql_limit_max_attribute.attr, 1054 &bql_limit_min_attribute.attr, 1055 &bql_hold_time_attribute.attr, 1056 &bql_inflight_attribute.attr, 1057 NULL 1058 }; 1059 1060 static struct attribute_group dql_group = { 1061 .name = "byte_queue_limits", 1062 .attrs = dql_attrs, 1063 }; 1064 #endif /* CONFIG_BQL */ 1065 1066 #ifdef CONFIG_XPS 1067 static unsigned int get_netdev_queue_index(struct netdev_queue *queue) 1068 { 1069 struct net_device *dev = queue->dev; 1070 unsigned int i; 1071 1072 i = queue - dev->_tx; 1073 BUG_ON(i >= dev->num_tx_queues); 1074 1075 return i; 1076 } 1077 1078 1079 static ssize_t show_xps_map(struct netdev_queue *queue, 1080 struct netdev_queue_attribute *attribute, char *buf) 1081 { 1082 struct net_device *dev = queue->dev; 1083 struct xps_dev_maps *dev_maps; 1084 cpumask_var_t mask; 1085 unsigned long index; 1086 int i, len; 1087 1088 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 1089 return -ENOMEM; 1090 1091 index = get_netdev_queue_index(queue); 1092 1093 rcu_read_lock(); 1094 dev_maps = rcu_dereference(dev->xps_maps); 1095 if (dev_maps) { 1096 for_each_possible_cpu(i) { 1097 struct xps_map *map = 1098 rcu_dereference(dev_maps->cpu_map[i]); 1099 if (map) { 1100 int j; 1101 for (j = 0; j < map->len; j++) { 1102 if (map->queues[j] == index) { 1103 cpumask_set_cpu(i, mask); 1104 break; 1105 } 1106 } 1107 } 1108 } 1109 } 1110 rcu_read_unlock(); 1111 1112 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 1113 free_cpumask_var(mask); 1114 return len < PAGE_SIZE ? len : -EINVAL; 1115 } 1116 1117 static ssize_t store_xps_map(struct netdev_queue *queue, 1118 struct netdev_queue_attribute *attribute, 1119 const char *buf, size_t len) 1120 { 1121 struct net_device *dev = queue->dev; 1122 unsigned long index; 1123 cpumask_var_t mask; 1124 int err; 1125 1126 if (!capable(CAP_NET_ADMIN)) 1127 return -EPERM; 1128 1129 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 1130 return -ENOMEM; 1131 1132 index = get_netdev_queue_index(queue); 1133 1134 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 1135 if (err) { 1136 free_cpumask_var(mask); 1137 return err; 1138 } 1139 1140 err = netif_set_xps_queue(dev, mask, index); 1141 1142 free_cpumask_var(mask); 1143 1144 return err ? : len; 1145 } 1146 1147 static struct netdev_queue_attribute xps_cpus_attribute = 1148 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map); 1149 #endif /* CONFIG_XPS */ 1150 1151 static struct attribute *netdev_queue_default_attrs[] = { 1152 &queue_trans_timeout.attr, 1153 #ifdef CONFIG_XPS 1154 &xps_cpus_attribute.attr, 1155 #endif 1156 NULL 1157 }; 1158 1159 static void netdev_queue_release(struct kobject *kobj) 1160 { 1161 struct netdev_queue *queue = to_netdev_queue(kobj); 1162 1163 memset(kobj, 0, sizeof(*kobj)); 1164 dev_put(queue->dev); 1165 } 1166 1167 static const void *netdev_queue_namespace(struct kobject *kobj) 1168 { 1169 struct netdev_queue *queue = to_netdev_queue(kobj); 1170 struct device *dev = &queue->dev->dev; 1171 const void *ns = NULL; 1172 1173 if (dev->class && dev->class->ns_type) 1174 ns = dev->class->namespace(dev); 1175 1176 return ns; 1177 } 1178 1179 static struct kobj_type netdev_queue_ktype = { 1180 .sysfs_ops = &netdev_queue_sysfs_ops, 1181 .release = netdev_queue_release, 1182 .default_attrs = netdev_queue_default_attrs, 1183 .namespace = netdev_queue_namespace, 1184 }; 1185 1186 static int netdev_queue_add_kobject(struct net_device *dev, int index) 1187 { 1188 struct netdev_queue *queue = dev->_tx + index; 1189 struct kobject *kobj = &queue->kobj; 1190 int error = 0; 1191 1192 kobj->kset = dev->queues_kset; 1193 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, 1194 "tx-%u", index); 1195 if (error) 1196 goto exit; 1197 1198 #ifdef CONFIG_BQL 1199 error = sysfs_create_group(kobj, &dql_group); 1200 if (error) 1201 goto exit; 1202 #endif 1203 1204 kobject_uevent(kobj, KOBJ_ADD); 1205 dev_hold(queue->dev); 1206 1207 return 0; 1208 exit: 1209 kobject_put(kobj); 1210 return error; 1211 } 1212 #endif /* CONFIG_SYSFS */ 1213 1214 int 1215 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 1216 { 1217 #ifdef CONFIG_SYSFS 1218 int i; 1219 int error = 0; 1220 1221 for (i = old_num; i < new_num; i++) { 1222 error = netdev_queue_add_kobject(dev, i); 1223 if (error) { 1224 new_num = old_num; 1225 break; 1226 } 1227 } 1228 1229 while (--i >= new_num) { 1230 struct netdev_queue *queue = dev->_tx + i; 1231 1232 #ifdef CONFIG_BQL 1233 sysfs_remove_group(&queue->kobj, &dql_group); 1234 #endif 1235 kobject_put(&queue->kobj); 1236 } 1237 1238 return error; 1239 #else 1240 return 0; 1241 #endif /* CONFIG_SYSFS */ 1242 } 1243 1244 static int register_queue_kobjects(struct net_device *dev) 1245 { 1246 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; 1247 1248 #ifdef CONFIG_SYSFS 1249 dev->queues_kset = kset_create_and_add("queues", 1250 NULL, &dev->dev.kobj); 1251 if (!dev->queues_kset) 1252 return -ENOMEM; 1253 real_rx = dev->real_num_rx_queues; 1254 #endif 1255 real_tx = dev->real_num_tx_queues; 1256 1257 error = net_rx_queue_update_kobjects(dev, 0, real_rx); 1258 if (error) 1259 goto error; 1260 rxq = real_rx; 1261 1262 error = netdev_queue_update_kobjects(dev, 0, real_tx); 1263 if (error) 1264 goto error; 1265 txq = real_tx; 1266 1267 return 0; 1268 1269 error: 1270 netdev_queue_update_kobjects(dev, txq, 0); 1271 net_rx_queue_update_kobjects(dev, rxq, 0); 1272 return error; 1273 } 1274 1275 static void remove_queue_kobjects(struct net_device *dev) 1276 { 1277 int real_rx = 0, real_tx = 0; 1278 1279 #ifdef CONFIG_SYSFS 1280 real_rx = dev->real_num_rx_queues; 1281 #endif 1282 real_tx = dev->real_num_tx_queues; 1283 1284 net_rx_queue_update_kobjects(dev, real_rx, 0); 1285 netdev_queue_update_kobjects(dev, real_tx, 0); 1286 #ifdef CONFIG_SYSFS 1287 kset_unregister(dev->queues_kset); 1288 #endif 1289 } 1290 1291 static bool net_current_may_mount(void) 1292 { 1293 struct net *net = current->nsproxy->net_ns; 1294 1295 return ns_capable(net->user_ns, CAP_SYS_ADMIN); 1296 } 1297 1298 static void *net_grab_current_ns(void) 1299 { 1300 struct net *ns = current->nsproxy->net_ns; 1301 #ifdef CONFIG_NET_NS 1302 if (ns) 1303 atomic_inc(&ns->passive); 1304 #endif 1305 return ns; 1306 } 1307 1308 static const void *net_initial_ns(void) 1309 { 1310 return &init_net; 1311 } 1312 1313 static const void *net_netlink_ns(struct sock *sk) 1314 { 1315 return sock_net(sk); 1316 } 1317 1318 struct kobj_ns_type_operations net_ns_type_operations = { 1319 .type = KOBJ_NS_TYPE_NET, 1320 .current_may_mount = net_current_may_mount, 1321 .grab_current_ns = net_grab_current_ns, 1322 .netlink_ns = net_netlink_ns, 1323 .initial_ns = net_initial_ns, 1324 .drop_ns = net_drop_ns, 1325 }; 1326 EXPORT_SYMBOL_GPL(net_ns_type_operations); 1327 1328 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 1329 { 1330 struct net_device *dev = to_net_dev(d); 1331 int retval; 1332 1333 /* pass interface to uevent. */ 1334 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 1335 if (retval) 1336 goto exit; 1337 1338 /* pass ifindex to uevent. 1339 * ifindex is useful as it won't change (interface name may change) 1340 * and is what RtNetlink uses natively. */ 1341 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 1342 1343 exit: 1344 return retval; 1345 } 1346 1347 /* 1348 * netdev_release -- destroy and free a dead device. 1349 * Called when last reference to device kobject is gone. 1350 */ 1351 static void netdev_release(struct device *d) 1352 { 1353 struct net_device *dev = to_net_dev(d); 1354 1355 BUG_ON(dev->reg_state != NETREG_RELEASED); 1356 1357 kfree(dev->ifalias); 1358 netdev_freemem(dev); 1359 } 1360 1361 static const void *net_namespace(struct device *d) 1362 { 1363 struct net_device *dev; 1364 dev = container_of(d, struct net_device, dev); 1365 return dev_net(dev); 1366 } 1367 1368 static struct class net_class = { 1369 .name = "net", 1370 .dev_release = netdev_release, 1371 .dev_groups = net_class_groups, 1372 .dev_uevent = netdev_uevent, 1373 .ns_type = &net_ns_type_operations, 1374 .namespace = net_namespace, 1375 }; 1376 1377 /* Delete sysfs entries but hold kobject reference until after all 1378 * netdev references are gone. 1379 */ 1380 void netdev_unregister_kobject(struct net_device *ndev) 1381 { 1382 struct device *dev = &(ndev->dev); 1383 1384 kobject_get(&dev->kobj); 1385 1386 remove_queue_kobjects(ndev); 1387 1388 pm_runtime_set_memalloc_noio(dev, false); 1389 1390 device_del(dev); 1391 } 1392 1393 /* Create sysfs entries for network device. */ 1394 int netdev_register_kobject(struct net_device *ndev) 1395 { 1396 struct device *dev = &(ndev->dev); 1397 const struct attribute_group **groups = ndev->sysfs_groups; 1398 int error = 0; 1399 1400 device_initialize(dev); 1401 dev->class = &net_class; 1402 dev->platform_data = ndev; 1403 dev->groups = groups; 1404 1405 dev_set_name(dev, "%s", ndev->name); 1406 1407 #ifdef CONFIG_SYSFS 1408 /* Allow for a device specific group */ 1409 if (*groups) 1410 groups++; 1411 1412 *groups++ = &netstat_group; 1413 1414 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 1415 if (ndev->ieee80211_ptr) 1416 *groups++ = &wireless_group; 1417 #if IS_ENABLED(CONFIG_WIRELESS_EXT) 1418 else if (ndev->wireless_handlers) 1419 *groups++ = &wireless_group; 1420 #endif 1421 #endif 1422 #endif /* CONFIG_SYSFS */ 1423 1424 error = device_add(dev); 1425 if (error) 1426 return error; 1427 1428 error = register_queue_kobjects(ndev); 1429 if (error) { 1430 device_del(dev); 1431 return error; 1432 } 1433 1434 pm_runtime_set_memalloc_noio(dev, true); 1435 1436 return error; 1437 } 1438 1439 int netdev_class_create_file_ns(struct class_attribute *class_attr, 1440 const void *ns) 1441 { 1442 return class_create_file_ns(&net_class, class_attr, ns); 1443 } 1444 EXPORT_SYMBOL(netdev_class_create_file_ns); 1445 1446 void netdev_class_remove_file_ns(struct class_attribute *class_attr, 1447 const void *ns) 1448 { 1449 class_remove_file_ns(&net_class, class_attr, ns); 1450 } 1451 EXPORT_SYMBOL(netdev_class_remove_file_ns); 1452 1453 int __init netdev_kobject_init(void) 1454 { 1455 kobj_ns_type_register(&net_ns_type_operations); 1456 return class_register(&net_class); 1457 } 1458