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 #include <linux/of.h> 27 28 #include "net-sysfs.h" 29 30 #ifdef CONFIG_SYSFS 31 static const char fmt_hex[] = "%#x\n"; 32 static const char fmt_long_hex[] = "%#lx\n"; 33 static const char fmt_dec[] = "%d\n"; 34 static const char fmt_udec[] = "%u\n"; 35 static const char fmt_ulong[] = "%lu\n"; 36 static const char fmt_u64[] = "%llu\n"; 37 38 static inline int dev_isalive(const struct net_device *dev) 39 { 40 return dev->reg_state <= NETREG_REGISTERED; 41 } 42 43 /* use same locking rules as GIF* ioctl's */ 44 static ssize_t netdev_show(const struct device *dev, 45 struct device_attribute *attr, char *buf, 46 ssize_t (*format)(const struct net_device *, char *)) 47 { 48 struct net_device *ndev = to_net_dev(dev); 49 ssize_t ret = -EINVAL; 50 51 read_lock(&dev_base_lock); 52 if (dev_isalive(ndev)) 53 ret = (*format)(ndev, buf); 54 read_unlock(&dev_base_lock); 55 56 return ret; 57 } 58 59 /* generate a show function for simple field */ 60 #define NETDEVICE_SHOW(field, format_string) \ 61 static ssize_t format_##field(const struct net_device *dev, char *buf) \ 62 { \ 63 return sprintf(buf, format_string, dev->field); \ 64 } \ 65 static ssize_t field##_show(struct device *dev, \ 66 struct device_attribute *attr, char *buf) \ 67 { \ 68 return netdev_show(dev, attr, buf, format_##field); \ 69 } \ 70 71 #define NETDEVICE_SHOW_RO(field, format_string) \ 72 NETDEVICE_SHOW(field, format_string); \ 73 static DEVICE_ATTR_RO(field) 74 75 #define NETDEVICE_SHOW_RW(field, format_string) \ 76 NETDEVICE_SHOW(field, format_string); \ 77 static DEVICE_ATTR_RW(field) 78 79 /* use same locking and permission rules as SIF* ioctl's */ 80 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, 81 const char *buf, size_t len, 82 int (*set)(struct net_device *, unsigned long)) 83 { 84 struct net_device *netdev = to_net_dev(dev); 85 struct net *net = dev_net(netdev); 86 unsigned long new; 87 int ret = -EINVAL; 88 89 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 90 return -EPERM; 91 92 ret = kstrtoul(buf, 0, &new); 93 if (ret) 94 goto err; 95 96 if (!rtnl_trylock()) 97 return restart_syscall(); 98 99 if (dev_isalive(netdev)) { 100 if ((ret = (*set)(netdev, new)) == 0) 101 ret = len; 102 } 103 rtnl_unlock(); 104 err: 105 return ret; 106 } 107 108 NETDEVICE_SHOW_RO(dev_id, fmt_hex); 109 NETDEVICE_SHOW_RO(dev_port, fmt_dec); 110 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec); 111 NETDEVICE_SHOW_RO(addr_len, 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 iflink_show(struct device *dev, struct device_attribute *attr, 117 char *buf) 118 { 119 struct net_device *ndev = to_net_dev(dev); 120 121 return sprintf(buf, fmt_dec, dev_get_iflink(ndev)); 122 } 123 static DEVICE_ATTR_RO(iflink); 124 125 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf) 126 { 127 return sprintf(buf, fmt_dec, dev->name_assign_type); 128 } 129 130 static ssize_t name_assign_type_show(struct device *dev, 131 struct device_attribute *attr, 132 char *buf) 133 { 134 struct net_device *ndev = to_net_dev(dev); 135 ssize_t ret = -EINVAL; 136 137 if (ndev->name_assign_type != NET_NAME_UNKNOWN) 138 ret = netdev_show(dev, attr, buf, format_name_assign_type); 139 140 return ret; 141 } 142 static DEVICE_ATTR_RO(name_assign_type); 143 144 /* use same locking rules as GIFHWADDR ioctl's */ 145 static ssize_t address_show(struct device *dev, struct device_attribute *attr, 146 char *buf) 147 { 148 struct net_device *ndev = to_net_dev(dev); 149 ssize_t ret = -EINVAL; 150 151 read_lock(&dev_base_lock); 152 if (dev_isalive(ndev)) 153 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len); 154 read_unlock(&dev_base_lock); 155 return ret; 156 } 157 static DEVICE_ATTR_RO(address); 158 159 static ssize_t broadcast_show(struct device *dev, 160 struct device_attribute *attr, char *buf) 161 { 162 struct net_device *ndev = to_net_dev(dev); 163 if (dev_isalive(ndev)) 164 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len); 165 return -EINVAL; 166 } 167 static DEVICE_ATTR_RO(broadcast); 168 169 static int change_carrier(struct net_device *dev, unsigned long new_carrier) 170 { 171 if (!netif_running(dev)) 172 return -EINVAL; 173 return dev_change_carrier(dev, (bool) new_carrier); 174 } 175 176 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr, 177 const char *buf, size_t len) 178 { 179 return netdev_store(dev, attr, buf, len, change_carrier); 180 } 181 182 static ssize_t carrier_show(struct device *dev, 183 struct device_attribute *attr, char *buf) 184 { 185 struct net_device *netdev = to_net_dev(dev); 186 if (netif_running(netdev)) { 187 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); 188 } 189 return -EINVAL; 190 } 191 static DEVICE_ATTR_RW(carrier); 192 193 static ssize_t speed_show(struct device *dev, 194 struct device_attribute *attr, char *buf) 195 { 196 struct net_device *netdev = to_net_dev(dev); 197 int ret = -EINVAL; 198 199 if (!rtnl_trylock()) 200 return restart_syscall(); 201 202 if (netif_running(netdev)) { 203 struct ethtool_cmd cmd; 204 if (!__ethtool_get_settings(netdev, &cmd)) 205 ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd)); 206 } 207 rtnl_unlock(); 208 return ret; 209 } 210 static DEVICE_ATTR_RO(speed); 211 212 static ssize_t duplex_show(struct device *dev, 213 struct device_attribute *attr, char *buf) 214 { 215 struct net_device *netdev = to_net_dev(dev); 216 int ret = -EINVAL; 217 218 if (!rtnl_trylock()) 219 return restart_syscall(); 220 221 if (netif_running(netdev)) { 222 struct ethtool_cmd cmd; 223 if (!__ethtool_get_settings(netdev, &cmd)) { 224 const char *duplex; 225 switch (cmd.duplex) { 226 case DUPLEX_HALF: 227 duplex = "half"; 228 break; 229 case DUPLEX_FULL: 230 duplex = "full"; 231 break; 232 default: 233 duplex = "unknown"; 234 break; 235 } 236 ret = sprintf(buf, "%s\n", duplex); 237 } 238 } 239 rtnl_unlock(); 240 return ret; 241 } 242 static DEVICE_ATTR_RO(duplex); 243 244 static ssize_t dormant_show(struct device *dev, 245 struct device_attribute *attr, char *buf) 246 { 247 struct net_device *netdev = to_net_dev(dev); 248 249 if (netif_running(netdev)) 250 return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); 251 252 return -EINVAL; 253 } 254 static DEVICE_ATTR_RO(dormant); 255 256 static const char *const operstates[] = { 257 "unknown", 258 "notpresent", /* currently unused */ 259 "down", 260 "lowerlayerdown", 261 "testing", /* currently unused */ 262 "dormant", 263 "up" 264 }; 265 266 static ssize_t operstate_show(struct device *dev, 267 struct device_attribute *attr, char *buf) 268 { 269 const struct net_device *netdev = to_net_dev(dev); 270 unsigned char operstate; 271 272 read_lock(&dev_base_lock); 273 operstate = netdev->operstate; 274 if (!netif_running(netdev)) 275 operstate = IF_OPER_DOWN; 276 read_unlock(&dev_base_lock); 277 278 if (operstate >= ARRAY_SIZE(operstates)) 279 return -EINVAL; /* should not happen */ 280 281 return sprintf(buf, "%s\n", operstates[operstate]); 282 } 283 static DEVICE_ATTR_RO(operstate); 284 285 static ssize_t carrier_changes_show(struct device *dev, 286 struct device_attribute *attr, 287 char *buf) 288 { 289 struct net_device *netdev = to_net_dev(dev); 290 return sprintf(buf, fmt_dec, 291 atomic_read(&netdev->carrier_changes)); 292 } 293 static DEVICE_ATTR_RO(carrier_changes); 294 295 /* read-write attributes */ 296 297 static int change_mtu(struct net_device *dev, unsigned long new_mtu) 298 { 299 return dev_set_mtu(dev, (int) new_mtu); 300 } 301 302 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr, 303 const char *buf, size_t len) 304 { 305 return netdev_store(dev, attr, buf, len, change_mtu); 306 } 307 NETDEVICE_SHOW_RW(mtu, fmt_dec); 308 309 static int change_flags(struct net_device *dev, unsigned long new_flags) 310 { 311 return dev_change_flags(dev, (unsigned int) new_flags); 312 } 313 314 static ssize_t flags_store(struct device *dev, struct device_attribute *attr, 315 const char *buf, size_t len) 316 { 317 return netdev_store(dev, attr, buf, len, change_flags); 318 } 319 NETDEVICE_SHOW_RW(flags, fmt_hex); 320 321 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len) 322 { 323 dev->tx_queue_len = new_len; 324 return 0; 325 } 326 327 static ssize_t tx_queue_len_store(struct device *dev, 328 struct device_attribute *attr, 329 const char *buf, size_t len) 330 { 331 if (!capable(CAP_NET_ADMIN)) 332 return -EPERM; 333 334 return netdev_store(dev, attr, buf, len, change_tx_queue_len); 335 } 336 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong); 337 338 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val) 339 { 340 dev->gro_flush_timeout = val; 341 return 0; 342 } 343 344 static ssize_t gro_flush_timeout_store(struct device *dev, 345 struct device_attribute *attr, 346 const char *buf, size_t len) 347 { 348 if (!capable(CAP_NET_ADMIN)) 349 return -EPERM; 350 351 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout); 352 } 353 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong); 354 355 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr, 356 const char *buf, size_t len) 357 { 358 struct net_device *netdev = to_net_dev(dev); 359 struct net *net = dev_net(netdev); 360 size_t count = len; 361 ssize_t ret; 362 363 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 364 return -EPERM; 365 366 /* ignore trailing newline */ 367 if (len > 0 && buf[len - 1] == '\n') 368 --count; 369 370 if (!rtnl_trylock()) 371 return restart_syscall(); 372 ret = dev_set_alias(netdev, buf, count); 373 rtnl_unlock(); 374 375 return ret < 0 ? ret : len; 376 } 377 378 static ssize_t ifalias_show(struct device *dev, 379 struct device_attribute *attr, char *buf) 380 { 381 const struct net_device *netdev = to_net_dev(dev); 382 ssize_t ret = 0; 383 384 if (!rtnl_trylock()) 385 return restart_syscall(); 386 if (netdev->ifalias) 387 ret = sprintf(buf, "%s\n", netdev->ifalias); 388 rtnl_unlock(); 389 return ret; 390 } 391 static DEVICE_ATTR_RW(ifalias); 392 393 static int change_group(struct net_device *dev, unsigned long new_group) 394 { 395 dev_set_group(dev, (int) new_group); 396 return 0; 397 } 398 399 static ssize_t group_store(struct device *dev, struct device_attribute *attr, 400 const char *buf, size_t len) 401 { 402 return netdev_store(dev, attr, buf, len, change_group); 403 } 404 NETDEVICE_SHOW(group, fmt_dec); 405 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store); 406 407 static ssize_t phys_port_id_show(struct device *dev, 408 struct device_attribute *attr, char *buf) 409 { 410 struct net_device *netdev = to_net_dev(dev); 411 ssize_t ret = -EINVAL; 412 413 if (!rtnl_trylock()) 414 return restart_syscall(); 415 416 if (dev_isalive(netdev)) { 417 struct netdev_phys_item_id ppid; 418 419 ret = dev_get_phys_port_id(netdev, &ppid); 420 if (!ret) 421 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); 422 } 423 rtnl_unlock(); 424 425 return ret; 426 } 427 static DEVICE_ATTR_RO(phys_port_id); 428 429 static ssize_t phys_port_name_show(struct device *dev, 430 struct device_attribute *attr, char *buf) 431 { 432 struct net_device *netdev = to_net_dev(dev); 433 ssize_t ret = -EINVAL; 434 435 if (!rtnl_trylock()) 436 return restart_syscall(); 437 438 if (dev_isalive(netdev)) { 439 char name[IFNAMSIZ]; 440 441 ret = dev_get_phys_port_name(netdev, name, sizeof(name)); 442 if (!ret) 443 ret = sprintf(buf, "%s\n", name); 444 } 445 rtnl_unlock(); 446 447 return ret; 448 } 449 static DEVICE_ATTR_RO(phys_port_name); 450 451 static ssize_t phys_switch_id_show(struct device *dev, 452 struct device_attribute *attr, char *buf) 453 { 454 struct net_device *netdev = to_net_dev(dev); 455 ssize_t ret = -EINVAL; 456 457 if (!rtnl_trylock()) 458 return restart_syscall(); 459 460 if (dev_isalive(netdev)) { 461 struct netdev_phys_item_id ppid; 462 463 ret = netdev_switch_parent_id_get(netdev, &ppid); 464 if (!ret) 465 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); 466 } 467 rtnl_unlock(); 468 469 return ret; 470 } 471 static DEVICE_ATTR_RO(phys_switch_id); 472 473 static struct attribute *net_class_attrs[] = { 474 &dev_attr_netdev_group.attr, 475 &dev_attr_type.attr, 476 &dev_attr_dev_id.attr, 477 &dev_attr_dev_port.attr, 478 &dev_attr_iflink.attr, 479 &dev_attr_ifindex.attr, 480 &dev_attr_name_assign_type.attr, 481 &dev_attr_addr_assign_type.attr, 482 &dev_attr_addr_len.attr, 483 &dev_attr_link_mode.attr, 484 &dev_attr_address.attr, 485 &dev_attr_broadcast.attr, 486 &dev_attr_speed.attr, 487 &dev_attr_duplex.attr, 488 &dev_attr_dormant.attr, 489 &dev_attr_operstate.attr, 490 &dev_attr_carrier_changes.attr, 491 &dev_attr_ifalias.attr, 492 &dev_attr_carrier.attr, 493 &dev_attr_mtu.attr, 494 &dev_attr_flags.attr, 495 &dev_attr_tx_queue_len.attr, 496 &dev_attr_gro_flush_timeout.attr, 497 &dev_attr_phys_port_id.attr, 498 &dev_attr_phys_port_name.attr, 499 &dev_attr_phys_switch_id.attr, 500 NULL, 501 }; 502 ATTRIBUTE_GROUPS(net_class); 503 504 /* Show a given an attribute in the statistics group */ 505 static ssize_t netstat_show(const struct device *d, 506 struct device_attribute *attr, char *buf, 507 unsigned long offset) 508 { 509 struct net_device *dev = to_net_dev(d); 510 ssize_t ret = -EINVAL; 511 512 WARN_ON(offset > sizeof(struct rtnl_link_stats64) || 513 offset % sizeof(u64) != 0); 514 515 read_lock(&dev_base_lock); 516 if (dev_isalive(dev)) { 517 struct rtnl_link_stats64 temp; 518 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 519 520 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset)); 521 } 522 read_unlock(&dev_base_lock); 523 return ret; 524 } 525 526 /* generate a read-only statistics attribute */ 527 #define NETSTAT_ENTRY(name) \ 528 static ssize_t name##_show(struct device *d, \ 529 struct device_attribute *attr, char *buf) \ 530 { \ 531 return netstat_show(d, attr, buf, \ 532 offsetof(struct rtnl_link_stats64, name)); \ 533 } \ 534 static DEVICE_ATTR_RO(name) 535 536 NETSTAT_ENTRY(rx_packets); 537 NETSTAT_ENTRY(tx_packets); 538 NETSTAT_ENTRY(rx_bytes); 539 NETSTAT_ENTRY(tx_bytes); 540 NETSTAT_ENTRY(rx_errors); 541 NETSTAT_ENTRY(tx_errors); 542 NETSTAT_ENTRY(rx_dropped); 543 NETSTAT_ENTRY(tx_dropped); 544 NETSTAT_ENTRY(multicast); 545 NETSTAT_ENTRY(collisions); 546 NETSTAT_ENTRY(rx_length_errors); 547 NETSTAT_ENTRY(rx_over_errors); 548 NETSTAT_ENTRY(rx_crc_errors); 549 NETSTAT_ENTRY(rx_frame_errors); 550 NETSTAT_ENTRY(rx_fifo_errors); 551 NETSTAT_ENTRY(rx_missed_errors); 552 NETSTAT_ENTRY(tx_aborted_errors); 553 NETSTAT_ENTRY(tx_carrier_errors); 554 NETSTAT_ENTRY(tx_fifo_errors); 555 NETSTAT_ENTRY(tx_heartbeat_errors); 556 NETSTAT_ENTRY(tx_window_errors); 557 NETSTAT_ENTRY(rx_compressed); 558 NETSTAT_ENTRY(tx_compressed); 559 560 static struct attribute *netstat_attrs[] = { 561 &dev_attr_rx_packets.attr, 562 &dev_attr_tx_packets.attr, 563 &dev_attr_rx_bytes.attr, 564 &dev_attr_tx_bytes.attr, 565 &dev_attr_rx_errors.attr, 566 &dev_attr_tx_errors.attr, 567 &dev_attr_rx_dropped.attr, 568 &dev_attr_tx_dropped.attr, 569 &dev_attr_multicast.attr, 570 &dev_attr_collisions.attr, 571 &dev_attr_rx_length_errors.attr, 572 &dev_attr_rx_over_errors.attr, 573 &dev_attr_rx_crc_errors.attr, 574 &dev_attr_rx_frame_errors.attr, 575 &dev_attr_rx_fifo_errors.attr, 576 &dev_attr_rx_missed_errors.attr, 577 &dev_attr_tx_aborted_errors.attr, 578 &dev_attr_tx_carrier_errors.attr, 579 &dev_attr_tx_fifo_errors.attr, 580 &dev_attr_tx_heartbeat_errors.attr, 581 &dev_attr_tx_window_errors.attr, 582 &dev_attr_rx_compressed.attr, 583 &dev_attr_tx_compressed.attr, 584 NULL 585 }; 586 587 588 static struct attribute_group netstat_group = { 589 .name = "statistics", 590 .attrs = netstat_attrs, 591 }; 592 593 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 594 static struct attribute *wireless_attrs[] = { 595 NULL 596 }; 597 598 static struct attribute_group wireless_group = { 599 .name = "wireless", 600 .attrs = wireless_attrs, 601 }; 602 #endif 603 604 #else /* CONFIG_SYSFS */ 605 #define net_class_groups NULL 606 #endif /* CONFIG_SYSFS */ 607 608 #ifdef CONFIG_SYSFS 609 #define to_rx_queue_attr(_attr) container_of(_attr, \ 610 struct rx_queue_attribute, attr) 611 612 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 613 614 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 615 char *buf) 616 { 617 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 618 struct netdev_rx_queue *queue = to_rx_queue(kobj); 619 620 if (!attribute->show) 621 return -EIO; 622 623 return attribute->show(queue, attribute, buf); 624 } 625 626 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 627 const char *buf, size_t count) 628 { 629 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 630 struct netdev_rx_queue *queue = to_rx_queue(kobj); 631 632 if (!attribute->store) 633 return -EIO; 634 635 return attribute->store(queue, attribute, buf, count); 636 } 637 638 static const struct sysfs_ops rx_queue_sysfs_ops = { 639 .show = rx_queue_attr_show, 640 .store = rx_queue_attr_store, 641 }; 642 643 #ifdef CONFIG_RPS 644 static ssize_t show_rps_map(struct netdev_rx_queue *queue, 645 struct rx_queue_attribute *attribute, char *buf) 646 { 647 struct rps_map *map; 648 cpumask_var_t mask; 649 int i, len; 650 651 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 652 return -ENOMEM; 653 654 rcu_read_lock(); 655 map = rcu_dereference(queue->rps_map); 656 if (map) 657 for (i = 0; i < map->len; i++) 658 cpumask_set_cpu(map->cpus[i], mask); 659 660 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 661 rcu_read_unlock(); 662 free_cpumask_var(mask); 663 664 return len < PAGE_SIZE ? len : -EINVAL; 665 } 666 667 static ssize_t store_rps_map(struct netdev_rx_queue *queue, 668 struct rx_queue_attribute *attribute, 669 const char *buf, size_t len) 670 { 671 struct rps_map *old_map, *map; 672 cpumask_var_t mask; 673 int err, cpu, i; 674 static DEFINE_SPINLOCK(rps_map_lock); 675 676 if (!capable(CAP_NET_ADMIN)) 677 return -EPERM; 678 679 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 680 return -ENOMEM; 681 682 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 683 if (err) { 684 free_cpumask_var(mask); 685 return err; 686 } 687 688 map = kzalloc(max_t(unsigned int, 689 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 690 GFP_KERNEL); 691 if (!map) { 692 free_cpumask_var(mask); 693 return -ENOMEM; 694 } 695 696 i = 0; 697 for_each_cpu_and(cpu, mask, cpu_online_mask) 698 map->cpus[i++] = cpu; 699 700 if (i) 701 map->len = i; 702 else { 703 kfree(map); 704 map = NULL; 705 } 706 707 spin_lock(&rps_map_lock); 708 old_map = rcu_dereference_protected(queue->rps_map, 709 lockdep_is_held(&rps_map_lock)); 710 rcu_assign_pointer(queue->rps_map, map); 711 spin_unlock(&rps_map_lock); 712 713 if (map) 714 static_key_slow_inc(&rps_needed); 715 if (old_map) { 716 kfree_rcu(old_map, rcu); 717 static_key_slow_dec(&rps_needed); 718 } 719 free_cpumask_var(mask); 720 return len; 721 } 722 723 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 724 struct rx_queue_attribute *attr, 725 char *buf) 726 { 727 struct rps_dev_flow_table *flow_table; 728 unsigned long val = 0; 729 730 rcu_read_lock(); 731 flow_table = rcu_dereference(queue->rps_flow_table); 732 if (flow_table) 733 val = (unsigned long)flow_table->mask + 1; 734 rcu_read_unlock(); 735 736 return sprintf(buf, "%lu\n", val); 737 } 738 739 static void rps_dev_flow_table_release(struct rcu_head *rcu) 740 { 741 struct rps_dev_flow_table *table = container_of(rcu, 742 struct rps_dev_flow_table, rcu); 743 vfree(table); 744 } 745 746 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 747 struct rx_queue_attribute *attr, 748 const char *buf, size_t len) 749 { 750 unsigned long mask, count; 751 struct rps_dev_flow_table *table, *old_table; 752 static DEFINE_SPINLOCK(rps_dev_flow_lock); 753 int rc; 754 755 if (!capable(CAP_NET_ADMIN)) 756 return -EPERM; 757 758 rc = kstrtoul(buf, 0, &count); 759 if (rc < 0) 760 return rc; 761 762 if (count) { 763 mask = count - 1; 764 /* mask = roundup_pow_of_two(count) - 1; 765 * without overflows... 766 */ 767 while ((mask | (mask >> 1)) != mask) 768 mask |= (mask >> 1); 769 /* On 64 bit arches, must check mask fits in table->mask (u32), 770 * and on 32bit arches, must check 771 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow. 772 */ 773 #if BITS_PER_LONG > 32 774 if (mask > (unsigned long)(u32)mask) 775 return -EINVAL; 776 #else 777 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) 778 / sizeof(struct rps_dev_flow)) { 779 /* Enforce a limit to prevent overflow */ 780 return -EINVAL; 781 } 782 #endif 783 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); 784 if (!table) 785 return -ENOMEM; 786 787 table->mask = mask; 788 for (count = 0; count <= mask; count++) 789 table->flows[count].cpu = RPS_NO_CPU; 790 } else 791 table = NULL; 792 793 spin_lock(&rps_dev_flow_lock); 794 old_table = rcu_dereference_protected(queue->rps_flow_table, 795 lockdep_is_held(&rps_dev_flow_lock)); 796 rcu_assign_pointer(queue->rps_flow_table, table); 797 spin_unlock(&rps_dev_flow_lock); 798 799 if (old_table) 800 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 801 802 return len; 803 } 804 805 static struct rx_queue_attribute rps_cpus_attribute = 806 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); 807 808 809 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = 810 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, 811 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 812 #endif /* CONFIG_RPS */ 813 814 static struct attribute *rx_queue_default_attrs[] = { 815 #ifdef CONFIG_RPS 816 &rps_cpus_attribute.attr, 817 &rps_dev_flow_table_cnt_attribute.attr, 818 #endif 819 NULL 820 }; 821 822 static void rx_queue_release(struct kobject *kobj) 823 { 824 struct netdev_rx_queue *queue = to_rx_queue(kobj); 825 #ifdef CONFIG_RPS 826 struct rps_map *map; 827 struct rps_dev_flow_table *flow_table; 828 829 830 map = rcu_dereference_protected(queue->rps_map, 1); 831 if (map) { 832 RCU_INIT_POINTER(queue->rps_map, NULL); 833 kfree_rcu(map, rcu); 834 } 835 836 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); 837 if (flow_table) { 838 RCU_INIT_POINTER(queue->rps_flow_table, NULL); 839 call_rcu(&flow_table->rcu, rps_dev_flow_table_release); 840 } 841 #endif 842 843 memset(kobj, 0, sizeof(*kobj)); 844 dev_put(queue->dev); 845 } 846 847 static const void *rx_queue_namespace(struct kobject *kobj) 848 { 849 struct netdev_rx_queue *queue = to_rx_queue(kobj); 850 struct device *dev = &queue->dev->dev; 851 const void *ns = NULL; 852 853 if (dev->class && dev->class->ns_type) 854 ns = dev->class->namespace(dev); 855 856 return ns; 857 } 858 859 static struct kobj_type rx_queue_ktype = { 860 .sysfs_ops = &rx_queue_sysfs_ops, 861 .release = rx_queue_release, 862 .default_attrs = rx_queue_default_attrs, 863 .namespace = rx_queue_namespace 864 }; 865 866 static int rx_queue_add_kobject(struct net_device *dev, int index) 867 { 868 struct netdev_rx_queue *queue = dev->_rx + index; 869 struct kobject *kobj = &queue->kobj; 870 int error = 0; 871 872 kobj->kset = dev->queues_kset; 873 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 874 "rx-%u", index); 875 if (error) 876 goto exit; 877 878 if (dev->sysfs_rx_queue_group) { 879 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); 880 if (error) 881 goto exit; 882 } 883 884 kobject_uevent(kobj, KOBJ_ADD); 885 dev_hold(queue->dev); 886 887 return error; 888 exit: 889 kobject_put(kobj); 890 return error; 891 } 892 #endif /* CONFIG_SYSFS */ 893 894 int 895 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 896 { 897 #ifdef CONFIG_SYSFS 898 int i; 899 int error = 0; 900 901 #ifndef CONFIG_RPS 902 if (!dev->sysfs_rx_queue_group) 903 return 0; 904 #endif 905 for (i = old_num; i < new_num; i++) { 906 error = rx_queue_add_kobject(dev, i); 907 if (error) { 908 new_num = old_num; 909 break; 910 } 911 } 912 913 while (--i >= new_num) { 914 if (dev->sysfs_rx_queue_group) 915 sysfs_remove_group(&dev->_rx[i].kobj, 916 dev->sysfs_rx_queue_group); 917 kobject_put(&dev->_rx[i].kobj); 918 } 919 920 return error; 921 #else 922 return 0; 923 #endif 924 } 925 926 #ifdef CONFIG_SYSFS 927 /* 928 * netdev_queue sysfs structures and functions. 929 */ 930 struct netdev_queue_attribute { 931 struct attribute attr; 932 ssize_t (*show)(struct netdev_queue *queue, 933 struct netdev_queue_attribute *attr, char *buf); 934 ssize_t (*store)(struct netdev_queue *queue, 935 struct netdev_queue_attribute *attr, const char *buf, size_t len); 936 }; 937 #define to_netdev_queue_attr(_attr) container_of(_attr, \ 938 struct netdev_queue_attribute, attr) 939 940 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) 941 942 static ssize_t netdev_queue_attr_show(struct kobject *kobj, 943 struct attribute *attr, char *buf) 944 { 945 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 946 struct netdev_queue *queue = to_netdev_queue(kobj); 947 948 if (!attribute->show) 949 return -EIO; 950 951 return attribute->show(queue, attribute, buf); 952 } 953 954 static ssize_t netdev_queue_attr_store(struct kobject *kobj, 955 struct attribute *attr, 956 const char *buf, size_t count) 957 { 958 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 959 struct netdev_queue *queue = to_netdev_queue(kobj); 960 961 if (!attribute->store) 962 return -EIO; 963 964 return attribute->store(queue, attribute, buf, count); 965 } 966 967 static const struct sysfs_ops netdev_queue_sysfs_ops = { 968 .show = netdev_queue_attr_show, 969 .store = netdev_queue_attr_store, 970 }; 971 972 static ssize_t show_trans_timeout(struct netdev_queue *queue, 973 struct netdev_queue_attribute *attribute, 974 char *buf) 975 { 976 unsigned long trans_timeout; 977 978 spin_lock_irq(&queue->_xmit_lock); 979 trans_timeout = queue->trans_timeout; 980 spin_unlock_irq(&queue->_xmit_lock); 981 982 return sprintf(buf, "%lu", trans_timeout); 983 } 984 985 #ifdef CONFIG_XPS 986 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue) 987 { 988 struct net_device *dev = queue->dev; 989 int i; 990 991 for (i = 0; i < dev->num_tx_queues; i++) 992 if (queue == &dev->_tx[i]) 993 break; 994 995 BUG_ON(i >= dev->num_tx_queues); 996 997 return i; 998 } 999 1000 static ssize_t show_tx_maxrate(struct netdev_queue *queue, 1001 struct netdev_queue_attribute *attribute, 1002 char *buf) 1003 { 1004 return sprintf(buf, "%lu\n", queue->tx_maxrate); 1005 } 1006 1007 static ssize_t set_tx_maxrate(struct netdev_queue *queue, 1008 struct netdev_queue_attribute *attribute, 1009 const char *buf, size_t len) 1010 { 1011 struct net_device *dev = queue->dev; 1012 int err, index = get_netdev_queue_index(queue); 1013 u32 rate = 0; 1014 1015 err = kstrtou32(buf, 10, &rate); 1016 if (err < 0) 1017 return err; 1018 1019 if (!rtnl_trylock()) 1020 return restart_syscall(); 1021 1022 err = -EOPNOTSUPP; 1023 if (dev->netdev_ops->ndo_set_tx_maxrate) 1024 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate); 1025 1026 rtnl_unlock(); 1027 if (!err) { 1028 queue->tx_maxrate = rate; 1029 return len; 1030 } 1031 return err; 1032 } 1033 1034 static struct netdev_queue_attribute queue_tx_maxrate = 1035 __ATTR(tx_maxrate, S_IRUGO | S_IWUSR, 1036 show_tx_maxrate, set_tx_maxrate); 1037 #endif 1038 1039 static struct netdev_queue_attribute queue_trans_timeout = 1040 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL); 1041 1042 #ifdef CONFIG_BQL 1043 /* 1044 * Byte queue limits sysfs structures and functions. 1045 */ 1046 static ssize_t bql_show(char *buf, unsigned int value) 1047 { 1048 return sprintf(buf, "%u\n", value); 1049 } 1050 1051 static ssize_t bql_set(const char *buf, const size_t count, 1052 unsigned int *pvalue) 1053 { 1054 unsigned int value; 1055 int err; 1056 1057 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) 1058 value = DQL_MAX_LIMIT; 1059 else { 1060 err = kstrtouint(buf, 10, &value); 1061 if (err < 0) 1062 return err; 1063 if (value > DQL_MAX_LIMIT) 1064 return -EINVAL; 1065 } 1066 1067 *pvalue = value; 1068 1069 return count; 1070 } 1071 1072 static ssize_t bql_show_hold_time(struct netdev_queue *queue, 1073 struct netdev_queue_attribute *attr, 1074 char *buf) 1075 { 1076 struct dql *dql = &queue->dql; 1077 1078 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); 1079 } 1080 1081 static ssize_t bql_set_hold_time(struct netdev_queue *queue, 1082 struct netdev_queue_attribute *attribute, 1083 const char *buf, size_t len) 1084 { 1085 struct dql *dql = &queue->dql; 1086 unsigned int value; 1087 int err; 1088 1089 err = kstrtouint(buf, 10, &value); 1090 if (err < 0) 1091 return err; 1092 1093 dql->slack_hold_time = msecs_to_jiffies(value); 1094 1095 return len; 1096 } 1097 1098 static struct netdev_queue_attribute bql_hold_time_attribute = 1099 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time, 1100 bql_set_hold_time); 1101 1102 static ssize_t bql_show_inflight(struct netdev_queue *queue, 1103 struct netdev_queue_attribute *attr, 1104 char *buf) 1105 { 1106 struct dql *dql = &queue->dql; 1107 1108 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); 1109 } 1110 1111 static struct netdev_queue_attribute bql_inflight_attribute = 1112 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL); 1113 1114 #define BQL_ATTR(NAME, FIELD) \ 1115 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ 1116 struct netdev_queue_attribute *attr, \ 1117 char *buf) \ 1118 { \ 1119 return bql_show(buf, queue->dql.FIELD); \ 1120 } \ 1121 \ 1122 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ 1123 struct netdev_queue_attribute *attr, \ 1124 const char *buf, size_t len) \ 1125 { \ 1126 return bql_set(buf, len, &queue->dql.FIELD); \ 1127 } \ 1128 \ 1129 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \ 1130 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \ 1131 bql_set_ ## NAME); 1132 1133 BQL_ATTR(limit, limit) 1134 BQL_ATTR(limit_max, max_limit) 1135 BQL_ATTR(limit_min, min_limit) 1136 1137 static struct attribute *dql_attrs[] = { 1138 &bql_limit_attribute.attr, 1139 &bql_limit_max_attribute.attr, 1140 &bql_limit_min_attribute.attr, 1141 &bql_hold_time_attribute.attr, 1142 &bql_inflight_attribute.attr, 1143 NULL 1144 }; 1145 1146 static struct attribute_group dql_group = { 1147 .name = "byte_queue_limits", 1148 .attrs = dql_attrs, 1149 }; 1150 #endif /* CONFIG_BQL */ 1151 1152 #ifdef CONFIG_XPS 1153 static ssize_t show_xps_map(struct netdev_queue *queue, 1154 struct netdev_queue_attribute *attribute, char *buf) 1155 { 1156 struct net_device *dev = queue->dev; 1157 struct xps_dev_maps *dev_maps; 1158 cpumask_var_t mask; 1159 unsigned long index; 1160 int i, len; 1161 1162 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 1163 return -ENOMEM; 1164 1165 index = get_netdev_queue_index(queue); 1166 1167 rcu_read_lock(); 1168 dev_maps = rcu_dereference(dev->xps_maps); 1169 if (dev_maps) { 1170 for_each_possible_cpu(i) { 1171 struct xps_map *map = 1172 rcu_dereference(dev_maps->cpu_map[i]); 1173 if (map) { 1174 int j; 1175 for (j = 0; j < map->len; j++) { 1176 if (map->queues[j] == index) { 1177 cpumask_set_cpu(i, mask); 1178 break; 1179 } 1180 } 1181 } 1182 } 1183 } 1184 rcu_read_unlock(); 1185 1186 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 1187 free_cpumask_var(mask); 1188 return len < PAGE_SIZE ? len : -EINVAL; 1189 } 1190 1191 static ssize_t store_xps_map(struct netdev_queue *queue, 1192 struct netdev_queue_attribute *attribute, 1193 const char *buf, size_t len) 1194 { 1195 struct net_device *dev = queue->dev; 1196 unsigned long index; 1197 cpumask_var_t mask; 1198 int err; 1199 1200 if (!capable(CAP_NET_ADMIN)) 1201 return -EPERM; 1202 1203 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 1204 return -ENOMEM; 1205 1206 index = get_netdev_queue_index(queue); 1207 1208 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 1209 if (err) { 1210 free_cpumask_var(mask); 1211 return err; 1212 } 1213 1214 err = netif_set_xps_queue(dev, mask, index); 1215 1216 free_cpumask_var(mask); 1217 1218 return err ? : len; 1219 } 1220 1221 static struct netdev_queue_attribute xps_cpus_attribute = 1222 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map); 1223 #endif /* CONFIG_XPS */ 1224 1225 static struct attribute *netdev_queue_default_attrs[] = { 1226 &queue_trans_timeout.attr, 1227 #ifdef CONFIG_XPS 1228 &xps_cpus_attribute.attr, 1229 &queue_tx_maxrate.attr, 1230 #endif 1231 NULL 1232 }; 1233 1234 static void netdev_queue_release(struct kobject *kobj) 1235 { 1236 struct netdev_queue *queue = to_netdev_queue(kobj); 1237 1238 memset(kobj, 0, sizeof(*kobj)); 1239 dev_put(queue->dev); 1240 } 1241 1242 static const void *netdev_queue_namespace(struct kobject *kobj) 1243 { 1244 struct netdev_queue *queue = to_netdev_queue(kobj); 1245 struct device *dev = &queue->dev->dev; 1246 const void *ns = NULL; 1247 1248 if (dev->class && dev->class->ns_type) 1249 ns = dev->class->namespace(dev); 1250 1251 return ns; 1252 } 1253 1254 static struct kobj_type netdev_queue_ktype = { 1255 .sysfs_ops = &netdev_queue_sysfs_ops, 1256 .release = netdev_queue_release, 1257 .default_attrs = netdev_queue_default_attrs, 1258 .namespace = netdev_queue_namespace, 1259 }; 1260 1261 static int netdev_queue_add_kobject(struct net_device *dev, int index) 1262 { 1263 struct netdev_queue *queue = dev->_tx + index; 1264 struct kobject *kobj = &queue->kobj; 1265 int error = 0; 1266 1267 kobj->kset = dev->queues_kset; 1268 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, 1269 "tx-%u", index); 1270 if (error) 1271 goto exit; 1272 1273 #ifdef CONFIG_BQL 1274 error = sysfs_create_group(kobj, &dql_group); 1275 if (error) 1276 goto exit; 1277 #endif 1278 1279 kobject_uevent(kobj, KOBJ_ADD); 1280 dev_hold(queue->dev); 1281 1282 return 0; 1283 exit: 1284 kobject_put(kobj); 1285 return error; 1286 } 1287 #endif /* CONFIG_SYSFS */ 1288 1289 int 1290 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 1291 { 1292 #ifdef CONFIG_SYSFS 1293 int i; 1294 int error = 0; 1295 1296 for (i = old_num; i < new_num; i++) { 1297 error = netdev_queue_add_kobject(dev, i); 1298 if (error) { 1299 new_num = old_num; 1300 break; 1301 } 1302 } 1303 1304 while (--i >= new_num) { 1305 struct netdev_queue *queue = dev->_tx + i; 1306 1307 #ifdef CONFIG_BQL 1308 sysfs_remove_group(&queue->kobj, &dql_group); 1309 #endif 1310 kobject_put(&queue->kobj); 1311 } 1312 1313 return error; 1314 #else 1315 return 0; 1316 #endif /* CONFIG_SYSFS */ 1317 } 1318 1319 static int register_queue_kobjects(struct net_device *dev) 1320 { 1321 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; 1322 1323 #ifdef CONFIG_SYSFS 1324 dev->queues_kset = kset_create_and_add("queues", 1325 NULL, &dev->dev.kobj); 1326 if (!dev->queues_kset) 1327 return -ENOMEM; 1328 real_rx = dev->real_num_rx_queues; 1329 #endif 1330 real_tx = dev->real_num_tx_queues; 1331 1332 error = net_rx_queue_update_kobjects(dev, 0, real_rx); 1333 if (error) 1334 goto error; 1335 rxq = real_rx; 1336 1337 error = netdev_queue_update_kobjects(dev, 0, real_tx); 1338 if (error) 1339 goto error; 1340 txq = real_tx; 1341 1342 return 0; 1343 1344 error: 1345 netdev_queue_update_kobjects(dev, txq, 0); 1346 net_rx_queue_update_kobjects(dev, rxq, 0); 1347 return error; 1348 } 1349 1350 static void remove_queue_kobjects(struct net_device *dev) 1351 { 1352 int real_rx = 0, real_tx = 0; 1353 1354 #ifdef CONFIG_SYSFS 1355 real_rx = dev->real_num_rx_queues; 1356 #endif 1357 real_tx = dev->real_num_tx_queues; 1358 1359 net_rx_queue_update_kobjects(dev, real_rx, 0); 1360 netdev_queue_update_kobjects(dev, real_tx, 0); 1361 #ifdef CONFIG_SYSFS 1362 kset_unregister(dev->queues_kset); 1363 #endif 1364 } 1365 1366 static bool net_current_may_mount(void) 1367 { 1368 struct net *net = current->nsproxy->net_ns; 1369 1370 return ns_capable(net->user_ns, CAP_SYS_ADMIN); 1371 } 1372 1373 static void *net_grab_current_ns(void) 1374 { 1375 struct net *ns = current->nsproxy->net_ns; 1376 #ifdef CONFIG_NET_NS 1377 if (ns) 1378 atomic_inc(&ns->passive); 1379 #endif 1380 return ns; 1381 } 1382 1383 static const void *net_initial_ns(void) 1384 { 1385 return &init_net; 1386 } 1387 1388 static const void *net_netlink_ns(struct sock *sk) 1389 { 1390 return sock_net(sk); 1391 } 1392 1393 struct kobj_ns_type_operations net_ns_type_operations = { 1394 .type = KOBJ_NS_TYPE_NET, 1395 .current_may_mount = net_current_may_mount, 1396 .grab_current_ns = net_grab_current_ns, 1397 .netlink_ns = net_netlink_ns, 1398 .initial_ns = net_initial_ns, 1399 .drop_ns = net_drop_ns, 1400 }; 1401 EXPORT_SYMBOL_GPL(net_ns_type_operations); 1402 1403 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 1404 { 1405 struct net_device *dev = to_net_dev(d); 1406 int retval; 1407 1408 /* pass interface to uevent. */ 1409 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 1410 if (retval) 1411 goto exit; 1412 1413 /* pass ifindex to uevent. 1414 * ifindex is useful as it won't change (interface name may change) 1415 * and is what RtNetlink uses natively. */ 1416 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 1417 1418 exit: 1419 return retval; 1420 } 1421 1422 /* 1423 * netdev_release -- destroy and free a dead device. 1424 * Called when last reference to device kobject is gone. 1425 */ 1426 static void netdev_release(struct device *d) 1427 { 1428 struct net_device *dev = to_net_dev(d); 1429 1430 BUG_ON(dev->reg_state != NETREG_RELEASED); 1431 1432 kfree(dev->ifalias); 1433 netdev_freemem(dev); 1434 } 1435 1436 static const void *net_namespace(struct device *d) 1437 { 1438 struct net_device *dev; 1439 dev = container_of(d, struct net_device, dev); 1440 return dev_net(dev); 1441 } 1442 1443 static struct class net_class = { 1444 .name = "net", 1445 .dev_release = netdev_release, 1446 .dev_groups = net_class_groups, 1447 .dev_uevent = netdev_uevent, 1448 .ns_type = &net_ns_type_operations, 1449 .namespace = net_namespace, 1450 }; 1451 1452 #ifdef CONFIG_OF_NET 1453 static int of_dev_node_match(struct device *dev, const void *data) 1454 { 1455 int ret = 0; 1456 1457 if (dev->parent) 1458 ret = dev->parent->of_node == data; 1459 1460 return ret == 0 ? dev->of_node == data : ret; 1461 } 1462 1463 struct net_device *of_find_net_device_by_node(struct device_node *np) 1464 { 1465 struct device *dev; 1466 1467 dev = class_find_device(&net_class, NULL, np, of_dev_node_match); 1468 if (!dev) 1469 return NULL; 1470 1471 return to_net_dev(dev); 1472 } 1473 EXPORT_SYMBOL(of_find_net_device_by_node); 1474 #endif 1475 1476 /* Delete sysfs entries but hold kobject reference until after all 1477 * netdev references are gone. 1478 */ 1479 void netdev_unregister_kobject(struct net_device *ndev) 1480 { 1481 struct device *dev = &(ndev->dev); 1482 1483 kobject_get(&dev->kobj); 1484 1485 remove_queue_kobjects(ndev); 1486 1487 pm_runtime_set_memalloc_noio(dev, false); 1488 1489 device_del(dev); 1490 } 1491 1492 /* Create sysfs entries for network device. */ 1493 int netdev_register_kobject(struct net_device *ndev) 1494 { 1495 struct device *dev = &(ndev->dev); 1496 const struct attribute_group **groups = ndev->sysfs_groups; 1497 int error = 0; 1498 1499 device_initialize(dev); 1500 dev->class = &net_class; 1501 dev->platform_data = ndev; 1502 dev->groups = groups; 1503 1504 dev_set_name(dev, "%s", ndev->name); 1505 1506 #ifdef CONFIG_SYSFS 1507 /* Allow for a device specific group */ 1508 if (*groups) 1509 groups++; 1510 1511 *groups++ = &netstat_group; 1512 1513 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 1514 if (ndev->ieee80211_ptr) 1515 *groups++ = &wireless_group; 1516 #if IS_ENABLED(CONFIG_WIRELESS_EXT) 1517 else if (ndev->wireless_handlers) 1518 *groups++ = &wireless_group; 1519 #endif 1520 #endif 1521 #endif /* CONFIG_SYSFS */ 1522 1523 error = device_add(dev); 1524 if (error) 1525 return error; 1526 1527 error = register_queue_kobjects(ndev); 1528 if (error) { 1529 device_del(dev); 1530 return error; 1531 } 1532 1533 pm_runtime_set_memalloc_noio(dev, true); 1534 1535 return error; 1536 } 1537 1538 int netdev_class_create_file_ns(struct class_attribute *class_attr, 1539 const void *ns) 1540 { 1541 return class_create_file_ns(&net_class, class_attr, ns); 1542 } 1543 EXPORT_SYMBOL(netdev_class_create_file_ns); 1544 1545 void netdev_class_remove_file_ns(struct class_attribute *class_attr, 1546 const void *ns) 1547 { 1548 class_remove_file_ns(&net_class, class_attr, ns); 1549 } 1550 EXPORT_SYMBOL(netdev_class_remove_file_ns); 1551 1552 int __init netdev_kobject_init(void) 1553 { 1554 kobj_ns_type_register(&net_ns_type_operations); 1555 return class_register(&net_class); 1556 } 1557