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_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(ifindex, fmt_dec); 112 NETDEVICE_SHOW_RO(type, fmt_dec); 113 NETDEVICE_SHOW_RO(link_mode, fmt_dec); 114 115 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr, 116 char *buf) 117 { 118 struct net_device *ndev = to_net_dev(dev); 119 120 return sprintf(buf, fmt_dec, dev_get_iflink(ndev)); 121 } 122 static DEVICE_ATTR_RO(iflink); 123 124 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf) 125 { 126 return sprintf(buf, fmt_dec, dev->name_assign_type); 127 } 128 129 static ssize_t name_assign_type_show(struct device *dev, 130 struct device_attribute *attr, 131 char *buf) 132 { 133 struct net_device *ndev = to_net_dev(dev); 134 ssize_t ret = -EINVAL; 135 136 if (ndev->name_assign_type != NET_NAME_UNKNOWN) 137 ret = netdev_show(dev, attr, buf, format_name_assign_type); 138 139 return ret; 140 } 141 static DEVICE_ATTR_RO(name_assign_type); 142 143 /* use same locking rules as GIFHWADDR ioctl's */ 144 static ssize_t address_show(struct device *dev, struct device_attribute *attr, 145 char *buf) 146 { 147 struct net_device *ndev = to_net_dev(dev); 148 ssize_t ret = -EINVAL; 149 150 read_lock(&dev_base_lock); 151 if (dev_isalive(ndev)) 152 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len); 153 read_unlock(&dev_base_lock); 154 return ret; 155 } 156 static DEVICE_ATTR_RO(address); 157 158 static ssize_t broadcast_show(struct device *dev, 159 struct device_attribute *attr, char *buf) 160 { 161 struct net_device *ndev = to_net_dev(dev); 162 if (dev_isalive(ndev)) 163 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len); 164 return -EINVAL; 165 } 166 static DEVICE_ATTR_RO(broadcast); 167 168 static int change_carrier(struct net_device *dev, unsigned long new_carrier) 169 { 170 if (!netif_running(dev)) 171 return -EINVAL; 172 return dev_change_carrier(dev, (bool) new_carrier); 173 } 174 175 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr, 176 const char *buf, size_t len) 177 { 178 return netdev_store(dev, attr, buf, len, change_carrier); 179 } 180 181 static ssize_t carrier_show(struct device *dev, 182 struct device_attribute *attr, char *buf) 183 { 184 struct net_device *netdev = to_net_dev(dev); 185 if (netif_running(netdev)) { 186 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); 187 } 188 return -EINVAL; 189 } 190 static DEVICE_ATTR_RW(carrier); 191 192 static ssize_t speed_show(struct device *dev, 193 struct device_attribute *attr, char *buf) 194 { 195 struct net_device *netdev = to_net_dev(dev); 196 int ret = -EINVAL; 197 198 if (!rtnl_trylock()) 199 return restart_syscall(); 200 201 if (netif_running(netdev)) { 202 struct ethtool_cmd cmd; 203 if (!__ethtool_get_settings(netdev, &cmd)) 204 ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd)); 205 } 206 rtnl_unlock(); 207 return ret; 208 } 209 static DEVICE_ATTR_RO(speed); 210 211 static ssize_t duplex_show(struct device *dev, 212 struct device_attribute *attr, char *buf) 213 { 214 struct net_device *netdev = to_net_dev(dev); 215 int ret = -EINVAL; 216 217 if (!rtnl_trylock()) 218 return restart_syscall(); 219 220 if (netif_running(netdev)) { 221 struct ethtool_cmd cmd; 222 if (!__ethtool_get_settings(netdev, &cmd)) { 223 const char *duplex; 224 switch (cmd.duplex) { 225 case DUPLEX_HALF: 226 duplex = "half"; 227 break; 228 case DUPLEX_FULL: 229 duplex = "full"; 230 break; 231 default: 232 duplex = "unknown"; 233 break; 234 } 235 ret = sprintf(buf, "%s\n", duplex); 236 } 237 } 238 rtnl_unlock(); 239 return ret; 240 } 241 static DEVICE_ATTR_RO(duplex); 242 243 static ssize_t dormant_show(struct device *dev, 244 struct device_attribute *attr, char *buf) 245 { 246 struct net_device *netdev = to_net_dev(dev); 247 248 if (netif_running(netdev)) 249 return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); 250 251 return -EINVAL; 252 } 253 static DEVICE_ATTR_RO(dormant); 254 255 static const char *const operstates[] = { 256 "unknown", 257 "notpresent", /* currently unused */ 258 "down", 259 "lowerlayerdown", 260 "testing", /* currently unused */ 261 "dormant", 262 "up" 263 }; 264 265 static ssize_t operstate_show(struct device *dev, 266 struct device_attribute *attr, char *buf) 267 { 268 const struct net_device *netdev = to_net_dev(dev); 269 unsigned char operstate; 270 271 read_lock(&dev_base_lock); 272 operstate = netdev->operstate; 273 if (!netif_running(netdev)) 274 operstate = IF_OPER_DOWN; 275 read_unlock(&dev_base_lock); 276 277 if (operstate >= ARRAY_SIZE(operstates)) 278 return -EINVAL; /* should not happen */ 279 280 return sprintf(buf, "%s\n", operstates[operstate]); 281 } 282 static DEVICE_ATTR_RO(operstate); 283 284 static ssize_t carrier_changes_show(struct device *dev, 285 struct device_attribute *attr, 286 char *buf) 287 { 288 struct net_device *netdev = to_net_dev(dev); 289 return sprintf(buf, fmt_dec, 290 atomic_read(&netdev->carrier_changes)); 291 } 292 static DEVICE_ATTR_RO(carrier_changes); 293 294 /* read-write attributes */ 295 296 static int change_mtu(struct net_device *dev, unsigned long new_mtu) 297 { 298 return dev_set_mtu(dev, (int) new_mtu); 299 } 300 301 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr, 302 const char *buf, size_t len) 303 { 304 return netdev_store(dev, attr, buf, len, change_mtu); 305 } 306 NETDEVICE_SHOW_RW(mtu, fmt_dec); 307 308 static int change_flags(struct net_device *dev, unsigned long new_flags) 309 { 310 return dev_change_flags(dev, (unsigned int) new_flags); 311 } 312 313 static ssize_t flags_store(struct device *dev, struct device_attribute *attr, 314 const char *buf, size_t len) 315 { 316 return netdev_store(dev, attr, buf, len, change_flags); 317 } 318 NETDEVICE_SHOW_RW(flags, fmt_hex); 319 320 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len) 321 { 322 dev->tx_queue_len = new_len; 323 return 0; 324 } 325 326 static ssize_t tx_queue_len_store(struct device *dev, 327 struct device_attribute *attr, 328 const char *buf, size_t len) 329 { 330 if (!capable(CAP_NET_ADMIN)) 331 return -EPERM; 332 333 return netdev_store(dev, attr, buf, len, change_tx_queue_len); 334 } 335 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong); 336 337 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val) 338 { 339 dev->gro_flush_timeout = val; 340 return 0; 341 } 342 343 static ssize_t gro_flush_timeout_store(struct device *dev, 344 struct device_attribute *attr, 345 const char *buf, size_t len) 346 { 347 if (!capable(CAP_NET_ADMIN)) 348 return -EPERM; 349 350 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout); 351 } 352 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong); 353 354 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr, 355 const char *buf, size_t len) 356 { 357 struct net_device *netdev = to_net_dev(dev); 358 struct net *net = dev_net(netdev); 359 size_t count = len; 360 ssize_t ret; 361 362 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 363 return -EPERM; 364 365 /* ignore trailing newline */ 366 if (len > 0 && buf[len - 1] == '\n') 367 --count; 368 369 if (!rtnl_trylock()) 370 return restart_syscall(); 371 ret = dev_set_alias(netdev, buf, count); 372 rtnl_unlock(); 373 374 return ret < 0 ? ret : len; 375 } 376 377 static ssize_t ifalias_show(struct device *dev, 378 struct device_attribute *attr, char *buf) 379 { 380 const struct net_device *netdev = to_net_dev(dev); 381 ssize_t ret = 0; 382 383 if (!rtnl_trylock()) 384 return restart_syscall(); 385 if (netdev->ifalias) 386 ret = sprintf(buf, "%s\n", netdev->ifalias); 387 rtnl_unlock(); 388 return ret; 389 } 390 static DEVICE_ATTR_RW(ifalias); 391 392 static int change_group(struct net_device *dev, unsigned long new_group) 393 { 394 dev_set_group(dev, (int) new_group); 395 return 0; 396 } 397 398 static ssize_t group_store(struct device *dev, struct device_attribute *attr, 399 const char *buf, size_t len) 400 { 401 return netdev_store(dev, attr, buf, len, change_group); 402 } 403 NETDEVICE_SHOW(group, fmt_dec); 404 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store); 405 406 static int change_proto_down(struct net_device *dev, unsigned long proto_down) 407 { 408 return dev_change_proto_down(dev, (bool) proto_down); 409 } 410 411 static ssize_t proto_down_store(struct device *dev, 412 struct device_attribute *attr, 413 const char *buf, size_t len) 414 { 415 return netdev_store(dev, attr, buf, len, change_proto_down); 416 } 417 NETDEVICE_SHOW_RW(proto_down, fmt_dec); 418 419 static ssize_t phys_port_id_show(struct device *dev, 420 struct device_attribute *attr, char *buf) 421 { 422 struct net_device *netdev = to_net_dev(dev); 423 ssize_t ret = -EINVAL; 424 425 if (!rtnl_trylock()) 426 return restart_syscall(); 427 428 if (dev_isalive(netdev)) { 429 struct netdev_phys_item_id ppid; 430 431 ret = dev_get_phys_port_id(netdev, &ppid); 432 if (!ret) 433 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); 434 } 435 rtnl_unlock(); 436 437 return ret; 438 } 439 static DEVICE_ATTR_RO(phys_port_id); 440 441 static ssize_t phys_port_name_show(struct device *dev, 442 struct device_attribute *attr, char *buf) 443 { 444 struct net_device *netdev = to_net_dev(dev); 445 ssize_t ret = -EINVAL; 446 447 if (!rtnl_trylock()) 448 return restart_syscall(); 449 450 if (dev_isalive(netdev)) { 451 char name[IFNAMSIZ]; 452 453 ret = dev_get_phys_port_name(netdev, name, sizeof(name)); 454 if (!ret) 455 ret = sprintf(buf, "%s\n", name); 456 } 457 rtnl_unlock(); 458 459 return ret; 460 } 461 static DEVICE_ATTR_RO(phys_port_name); 462 463 static ssize_t phys_switch_id_show(struct device *dev, 464 struct device_attribute *attr, char *buf) 465 { 466 struct net_device *netdev = to_net_dev(dev); 467 ssize_t ret = -EINVAL; 468 469 if (!rtnl_trylock()) 470 return restart_syscall(); 471 472 if (dev_isalive(netdev)) { 473 struct switchdev_attr attr = { 474 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 475 .flags = SWITCHDEV_F_NO_RECURSE, 476 }; 477 478 ret = switchdev_port_attr_get(netdev, &attr); 479 if (!ret) 480 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len, 481 attr.u.ppid.id); 482 } 483 rtnl_unlock(); 484 485 return ret; 486 } 487 static DEVICE_ATTR_RO(phys_switch_id); 488 489 static struct attribute *net_class_attrs[] = { 490 &dev_attr_netdev_group.attr, 491 &dev_attr_type.attr, 492 &dev_attr_dev_id.attr, 493 &dev_attr_dev_port.attr, 494 &dev_attr_iflink.attr, 495 &dev_attr_ifindex.attr, 496 &dev_attr_name_assign_type.attr, 497 &dev_attr_addr_assign_type.attr, 498 &dev_attr_addr_len.attr, 499 &dev_attr_link_mode.attr, 500 &dev_attr_address.attr, 501 &dev_attr_broadcast.attr, 502 &dev_attr_speed.attr, 503 &dev_attr_duplex.attr, 504 &dev_attr_dormant.attr, 505 &dev_attr_operstate.attr, 506 &dev_attr_carrier_changes.attr, 507 &dev_attr_ifalias.attr, 508 &dev_attr_carrier.attr, 509 &dev_attr_mtu.attr, 510 &dev_attr_flags.attr, 511 &dev_attr_tx_queue_len.attr, 512 &dev_attr_gro_flush_timeout.attr, 513 &dev_attr_phys_port_id.attr, 514 &dev_attr_phys_port_name.attr, 515 &dev_attr_phys_switch_id.attr, 516 &dev_attr_proto_down.attr, 517 NULL, 518 }; 519 ATTRIBUTE_GROUPS(net_class); 520 521 /* Show a given an attribute in the statistics group */ 522 static ssize_t netstat_show(const struct device *d, 523 struct device_attribute *attr, char *buf, 524 unsigned long offset) 525 { 526 struct net_device *dev = to_net_dev(d); 527 ssize_t ret = -EINVAL; 528 529 WARN_ON(offset > sizeof(struct rtnl_link_stats64) || 530 offset % sizeof(u64) != 0); 531 532 read_lock(&dev_base_lock); 533 if (dev_isalive(dev)) { 534 struct rtnl_link_stats64 temp; 535 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 536 537 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset)); 538 } 539 read_unlock(&dev_base_lock); 540 return ret; 541 } 542 543 /* generate a read-only statistics attribute */ 544 #define NETSTAT_ENTRY(name) \ 545 static ssize_t name##_show(struct device *d, \ 546 struct device_attribute *attr, char *buf) \ 547 { \ 548 return netstat_show(d, attr, buf, \ 549 offsetof(struct rtnl_link_stats64, name)); \ 550 } \ 551 static DEVICE_ATTR_RO(name) 552 553 NETSTAT_ENTRY(rx_packets); 554 NETSTAT_ENTRY(tx_packets); 555 NETSTAT_ENTRY(rx_bytes); 556 NETSTAT_ENTRY(tx_bytes); 557 NETSTAT_ENTRY(rx_errors); 558 NETSTAT_ENTRY(tx_errors); 559 NETSTAT_ENTRY(rx_dropped); 560 NETSTAT_ENTRY(tx_dropped); 561 NETSTAT_ENTRY(multicast); 562 NETSTAT_ENTRY(collisions); 563 NETSTAT_ENTRY(rx_length_errors); 564 NETSTAT_ENTRY(rx_over_errors); 565 NETSTAT_ENTRY(rx_crc_errors); 566 NETSTAT_ENTRY(rx_frame_errors); 567 NETSTAT_ENTRY(rx_fifo_errors); 568 NETSTAT_ENTRY(rx_missed_errors); 569 NETSTAT_ENTRY(tx_aborted_errors); 570 NETSTAT_ENTRY(tx_carrier_errors); 571 NETSTAT_ENTRY(tx_fifo_errors); 572 NETSTAT_ENTRY(tx_heartbeat_errors); 573 NETSTAT_ENTRY(tx_window_errors); 574 NETSTAT_ENTRY(rx_compressed); 575 NETSTAT_ENTRY(tx_compressed); 576 577 static struct attribute *netstat_attrs[] = { 578 &dev_attr_rx_packets.attr, 579 &dev_attr_tx_packets.attr, 580 &dev_attr_rx_bytes.attr, 581 &dev_attr_tx_bytes.attr, 582 &dev_attr_rx_errors.attr, 583 &dev_attr_tx_errors.attr, 584 &dev_attr_rx_dropped.attr, 585 &dev_attr_tx_dropped.attr, 586 &dev_attr_multicast.attr, 587 &dev_attr_collisions.attr, 588 &dev_attr_rx_length_errors.attr, 589 &dev_attr_rx_over_errors.attr, 590 &dev_attr_rx_crc_errors.attr, 591 &dev_attr_rx_frame_errors.attr, 592 &dev_attr_rx_fifo_errors.attr, 593 &dev_attr_rx_missed_errors.attr, 594 &dev_attr_tx_aborted_errors.attr, 595 &dev_attr_tx_carrier_errors.attr, 596 &dev_attr_tx_fifo_errors.attr, 597 &dev_attr_tx_heartbeat_errors.attr, 598 &dev_attr_tx_window_errors.attr, 599 &dev_attr_rx_compressed.attr, 600 &dev_attr_tx_compressed.attr, 601 NULL 602 }; 603 604 605 static struct attribute_group netstat_group = { 606 .name = "statistics", 607 .attrs = netstat_attrs, 608 }; 609 610 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 611 static struct attribute *wireless_attrs[] = { 612 NULL 613 }; 614 615 static struct attribute_group wireless_group = { 616 .name = "wireless", 617 .attrs = wireless_attrs, 618 }; 619 #endif 620 621 #else /* CONFIG_SYSFS */ 622 #define net_class_groups NULL 623 #endif /* CONFIG_SYSFS */ 624 625 #ifdef CONFIG_SYSFS 626 #define to_rx_queue_attr(_attr) container_of(_attr, \ 627 struct rx_queue_attribute, attr) 628 629 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 630 631 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 632 char *buf) 633 { 634 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 635 struct netdev_rx_queue *queue = to_rx_queue(kobj); 636 637 if (!attribute->show) 638 return -EIO; 639 640 return attribute->show(queue, attribute, buf); 641 } 642 643 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 644 const char *buf, size_t count) 645 { 646 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 647 struct netdev_rx_queue *queue = to_rx_queue(kobj); 648 649 if (!attribute->store) 650 return -EIO; 651 652 return attribute->store(queue, attribute, buf, count); 653 } 654 655 static const struct sysfs_ops rx_queue_sysfs_ops = { 656 .show = rx_queue_attr_show, 657 .store = rx_queue_attr_store, 658 }; 659 660 #ifdef CONFIG_RPS 661 static ssize_t show_rps_map(struct netdev_rx_queue *queue, 662 struct rx_queue_attribute *attribute, char *buf) 663 { 664 struct rps_map *map; 665 cpumask_var_t mask; 666 int i, len; 667 668 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 669 return -ENOMEM; 670 671 rcu_read_lock(); 672 map = rcu_dereference(queue->rps_map); 673 if (map) 674 for (i = 0; i < map->len; i++) 675 cpumask_set_cpu(map->cpus[i], mask); 676 677 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 678 rcu_read_unlock(); 679 free_cpumask_var(mask); 680 681 return len < PAGE_SIZE ? len : -EINVAL; 682 } 683 684 static ssize_t store_rps_map(struct netdev_rx_queue *queue, 685 struct rx_queue_attribute *attribute, 686 const char *buf, size_t len) 687 { 688 struct rps_map *old_map, *map; 689 cpumask_var_t mask; 690 int err, cpu, i; 691 static DEFINE_MUTEX(rps_map_mutex); 692 693 if (!capable(CAP_NET_ADMIN)) 694 return -EPERM; 695 696 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 697 return -ENOMEM; 698 699 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 700 if (err) { 701 free_cpumask_var(mask); 702 return err; 703 } 704 705 map = kzalloc(max_t(unsigned int, 706 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 707 GFP_KERNEL); 708 if (!map) { 709 free_cpumask_var(mask); 710 return -ENOMEM; 711 } 712 713 i = 0; 714 for_each_cpu_and(cpu, mask, cpu_online_mask) 715 map->cpus[i++] = cpu; 716 717 if (i) 718 map->len = i; 719 else { 720 kfree(map); 721 map = NULL; 722 } 723 724 mutex_lock(&rps_map_mutex); 725 old_map = rcu_dereference_protected(queue->rps_map, 726 mutex_is_locked(&rps_map_mutex)); 727 rcu_assign_pointer(queue->rps_map, map); 728 729 if (map) 730 static_key_slow_inc(&rps_needed); 731 if (old_map) 732 static_key_slow_dec(&rps_needed); 733 734 mutex_unlock(&rps_map_mutex); 735 736 if (old_map) 737 kfree_rcu(old_map, rcu); 738 739 free_cpumask_var(mask); 740 return len; 741 } 742 743 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 744 struct rx_queue_attribute *attr, 745 char *buf) 746 { 747 struct rps_dev_flow_table *flow_table; 748 unsigned long val = 0; 749 750 rcu_read_lock(); 751 flow_table = rcu_dereference(queue->rps_flow_table); 752 if (flow_table) 753 val = (unsigned long)flow_table->mask + 1; 754 rcu_read_unlock(); 755 756 return sprintf(buf, "%lu\n", val); 757 } 758 759 static void rps_dev_flow_table_release(struct rcu_head *rcu) 760 { 761 struct rps_dev_flow_table *table = container_of(rcu, 762 struct rps_dev_flow_table, rcu); 763 vfree(table); 764 } 765 766 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 767 struct rx_queue_attribute *attr, 768 const char *buf, size_t len) 769 { 770 unsigned long mask, count; 771 struct rps_dev_flow_table *table, *old_table; 772 static DEFINE_SPINLOCK(rps_dev_flow_lock); 773 int rc; 774 775 if (!capable(CAP_NET_ADMIN)) 776 return -EPERM; 777 778 rc = kstrtoul(buf, 0, &count); 779 if (rc < 0) 780 return rc; 781 782 if (count) { 783 mask = count - 1; 784 /* mask = roundup_pow_of_two(count) - 1; 785 * without overflows... 786 */ 787 while ((mask | (mask >> 1)) != mask) 788 mask |= (mask >> 1); 789 /* On 64 bit arches, must check mask fits in table->mask (u32), 790 * and on 32bit arches, must check 791 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow. 792 */ 793 #if BITS_PER_LONG > 32 794 if (mask > (unsigned long)(u32)mask) 795 return -EINVAL; 796 #else 797 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) 798 / sizeof(struct rps_dev_flow)) { 799 /* Enforce a limit to prevent overflow */ 800 return -EINVAL; 801 } 802 #endif 803 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); 804 if (!table) 805 return -ENOMEM; 806 807 table->mask = mask; 808 for (count = 0; count <= mask; count++) 809 table->flows[count].cpu = RPS_NO_CPU; 810 } else 811 table = NULL; 812 813 spin_lock(&rps_dev_flow_lock); 814 old_table = rcu_dereference_protected(queue->rps_flow_table, 815 lockdep_is_held(&rps_dev_flow_lock)); 816 rcu_assign_pointer(queue->rps_flow_table, table); 817 spin_unlock(&rps_dev_flow_lock); 818 819 if (old_table) 820 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 821 822 return len; 823 } 824 825 static struct rx_queue_attribute rps_cpus_attribute = 826 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); 827 828 829 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = 830 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, 831 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 832 #endif /* CONFIG_RPS */ 833 834 static struct attribute *rx_queue_default_attrs[] = { 835 #ifdef CONFIG_RPS 836 &rps_cpus_attribute.attr, 837 &rps_dev_flow_table_cnt_attribute.attr, 838 #endif 839 NULL 840 }; 841 842 static void rx_queue_release(struct kobject *kobj) 843 { 844 struct netdev_rx_queue *queue = to_rx_queue(kobj); 845 #ifdef CONFIG_RPS 846 struct rps_map *map; 847 struct rps_dev_flow_table *flow_table; 848 849 850 map = rcu_dereference_protected(queue->rps_map, 1); 851 if (map) { 852 RCU_INIT_POINTER(queue->rps_map, NULL); 853 kfree_rcu(map, rcu); 854 } 855 856 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); 857 if (flow_table) { 858 RCU_INIT_POINTER(queue->rps_flow_table, NULL); 859 call_rcu(&flow_table->rcu, rps_dev_flow_table_release); 860 } 861 #endif 862 863 memset(kobj, 0, sizeof(*kobj)); 864 dev_put(queue->dev); 865 } 866 867 static const void *rx_queue_namespace(struct kobject *kobj) 868 { 869 struct netdev_rx_queue *queue = to_rx_queue(kobj); 870 struct device *dev = &queue->dev->dev; 871 const void *ns = NULL; 872 873 if (dev->class && dev->class->ns_type) 874 ns = dev->class->namespace(dev); 875 876 return ns; 877 } 878 879 static struct kobj_type rx_queue_ktype = { 880 .sysfs_ops = &rx_queue_sysfs_ops, 881 .release = rx_queue_release, 882 .default_attrs = rx_queue_default_attrs, 883 .namespace = rx_queue_namespace 884 }; 885 886 static int rx_queue_add_kobject(struct net_device *dev, int index) 887 { 888 struct netdev_rx_queue *queue = dev->_rx + index; 889 struct kobject *kobj = &queue->kobj; 890 int error = 0; 891 892 kobj->kset = dev->queues_kset; 893 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 894 "rx-%u", index); 895 if (error) 896 goto exit; 897 898 if (dev->sysfs_rx_queue_group) { 899 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); 900 if (error) 901 goto exit; 902 } 903 904 kobject_uevent(kobj, KOBJ_ADD); 905 dev_hold(queue->dev); 906 907 return error; 908 exit: 909 kobject_put(kobj); 910 return error; 911 } 912 #endif /* CONFIG_SYSFS */ 913 914 int 915 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 916 { 917 #ifdef CONFIG_SYSFS 918 int i; 919 int error = 0; 920 921 #ifndef CONFIG_RPS 922 if (!dev->sysfs_rx_queue_group) 923 return 0; 924 #endif 925 for (i = old_num; i < new_num; i++) { 926 error = rx_queue_add_kobject(dev, i); 927 if (error) { 928 new_num = old_num; 929 break; 930 } 931 } 932 933 while (--i >= new_num) { 934 if (dev->sysfs_rx_queue_group) 935 sysfs_remove_group(&dev->_rx[i].kobj, 936 dev->sysfs_rx_queue_group); 937 kobject_put(&dev->_rx[i].kobj); 938 } 939 940 return error; 941 #else 942 return 0; 943 #endif 944 } 945 946 #ifdef CONFIG_SYSFS 947 /* 948 * netdev_queue sysfs structures and functions. 949 */ 950 struct netdev_queue_attribute { 951 struct attribute attr; 952 ssize_t (*show)(struct netdev_queue *queue, 953 struct netdev_queue_attribute *attr, char *buf); 954 ssize_t (*store)(struct netdev_queue *queue, 955 struct netdev_queue_attribute *attr, const char *buf, size_t len); 956 }; 957 #define to_netdev_queue_attr(_attr) container_of(_attr, \ 958 struct netdev_queue_attribute, attr) 959 960 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) 961 962 static ssize_t netdev_queue_attr_show(struct kobject *kobj, 963 struct attribute *attr, char *buf) 964 { 965 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 966 struct netdev_queue *queue = to_netdev_queue(kobj); 967 968 if (!attribute->show) 969 return -EIO; 970 971 return attribute->show(queue, attribute, buf); 972 } 973 974 static ssize_t netdev_queue_attr_store(struct kobject *kobj, 975 struct attribute *attr, 976 const char *buf, size_t count) 977 { 978 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 979 struct netdev_queue *queue = to_netdev_queue(kobj); 980 981 if (!attribute->store) 982 return -EIO; 983 984 return attribute->store(queue, attribute, buf, count); 985 } 986 987 static const struct sysfs_ops netdev_queue_sysfs_ops = { 988 .show = netdev_queue_attr_show, 989 .store = netdev_queue_attr_store, 990 }; 991 992 static ssize_t show_trans_timeout(struct netdev_queue *queue, 993 struct netdev_queue_attribute *attribute, 994 char *buf) 995 { 996 unsigned long trans_timeout; 997 998 spin_lock_irq(&queue->_xmit_lock); 999 trans_timeout = queue->trans_timeout; 1000 spin_unlock_irq(&queue->_xmit_lock); 1001 1002 return sprintf(buf, "%lu", trans_timeout); 1003 } 1004 1005 #ifdef CONFIG_XPS 1006 static unsigned int get_netdev_queue_index(struct netdev_queue *queue) 1007 { 1008 struct net_device *dev = queue->dev; 1009 unsigned int i; 1010 1011 i = queue - dev->_tx; 1012 BUG_ON(i >= dev->num_tx_queues); 1013 1014 return i; 1015 } 1016 1017 static ssize_t show_tx_maxrate(struct netdev_queue *queue, 1018 struct netdev_queue_attribute *attribute, 1019 char *buf) 1020 { 1021 return sprintf(buf, "%lu\n", queue->tx_maxrate); 1022 } 1023 1024 static ssize_t set_tx_maxrate(struct netdev_queue *queue, 1025 struct netdev_queue_attribute *attribute, 1026 const char *buf, size_t len) 1027 { 1028 struct net_device *dev = queue->dev; 1029 int err, index = get_netdev_queue_index(queue); 1030 u32 rate = 0; 1031 1032 err = kstrtou32(buf, 10, &rate); 1033 if (err < 0) 1034 return err; 1035 1036 if (!rtnl_trylock()) 1037 return restart_syscall(); 1038 1039 err = -EOPNOTSUPP; 1040 if (dev->netdev_ops->ndo_set_tx_maxrate) 1041 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate); 1042 1043 rtnl_unlock(); 1044 if (!err) { 1045 queue->tx_maxrate = rate; 1046 return len; 1047 } 1048 return err; 1049 } 1050 1051 static struct netdev_queue_attribute queue_tx_maxrate = 1052 __ATTR(tx_maxrate, S_IRUGO | S_IWUSR, 1053 show_tx_maxrate, set_tx_maxrate); 1054 #endif 1055 1056 static struct netdev_queue_attribute queue_trans_timeout = 1057 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL); 1058 1059 #ifdef CONFIG_BQL 1060 /* 1061 * Byte queue limits sysfs structures and functions. 1062 */ 1063 static ssize_t bql_show(char *buf, unsigned int value) 1064 { 1065 return sprintf(buf, "%u\n", value); 1066 } 1067 1068 static ssize_t bql_set(const char *buf, const size_t count, 1069 unsigned int *pvalue) 1070 { 1071 unsigned int value; 1072 int err; 1073 1074 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) 1075 value = DQL_MAX_LIMIT; 1076 else { 1077 err = kstrtouint(buf, 10, &value); 1078 if (err < 0) 1079 return err; 1080 if (value > DQL_MAX_LIMIT) 1081 return -EINVAL; 1082 } 1083 1084 *pvalue = value; 1085 1086 return count; 1087 } 1088 1089 static ssize_t bql_show_hold_time(struct netdev_queue *queue, 1090 struct netdev_queue_attribute *attr, 1091 char *buf) 1092 { 1093 struct dql *dql = &queue->dql; 1094 1095 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); 1096 } 1097 1098 static ssize_t bql_set_hold_time(struct netdev_queue *queue, 1099 struct netdev_queue_attribute *attribute, 1100 const char *buf, size_t len) 1101 { 1102 struct dql *dql = &queue->dql; 1103 unsigned int value; 1104 int err; 1105 1106 err = kstrtouint(buf, 10, &value); 1107 if (err < 0) 1108 return err; 1109 1110 dql->slack_hold_time = msecs_to_jiffies(value); 1111 1112 return len; 1113 } 1114 1115 static struct netdev_queue_attribute bql_hold_time_attribute = 1116 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time, 1117 bql_set_hold_time); 1118 1119 static ssize_t bql_show_inflight(struct netdev_queue *queue, 1120 struct netdev_queue_attribute *attr, 1121 char *buf) 1122 { 1123 struct dql *dql = &queue->dql; 1124 1125 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); 1126 } 1127 1128 static struct netdev_queue_attribute bql_inflight_attribute = 1129 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL); 1130 1131 #define BQL_ATTR(NAME, FIELD) \ 1132 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ 1133 struct netdev_queue_attribute *attr, \ 1134 char *buf) \ 1135 { \ 1136 return bql_show(buf, queue->dql.FIELD); \ 1137 } \ 1138 \ 1139 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ 1140 struct netdev_queue_attribute *attr, \ 1141 const char *buf, size_t len) \ 1142 { \ 1143 return bql_set(buf, len, &queue->dql.FIELD); \ 1144 } \ 1145 \ 1146 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \ 1147 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \ 1148 bql_set_ ## NAME); 1149 1150 BQL_ATTR(limit, limit) 1151 BQL_ATTR(limit_max, max_limit) 1152 BQL_ATTR(limit_min, min_limit) 1153 1154 static struct attribute *dql_attrs[] = { 1155 &bql_limit_attribute.attr, 1156 &bql_limit_max_attribute.attr, 1157 &bql_limit_min_attribute.attr, 1158 &bql_hold_time_attribute.attr, 1159 &bql_inflight_attribute.attr, 1160 NULL 1161 }; 1162 1163 static struct attribute_group dql_group = { 1164 .name = "byte_queue_limits", 1165 .attrs = dql_attrs, 1166 }; 1167 #endif /* CONFIG_BQL */ 1168 1169 #ifdef CONFIG_XPS 1170 static ssize_t show_xps_map(struct netdev_queue *queue, 1171 struct netdev_queue_attribute *attribute, char *buf) 1172 { 1173 struct net_device *dev = queue->dev; 1174 struct xps_dev_maps *dev_maps; 1175 cpumask_var_t mask; 1176 unsigned long index; 1177 int i, len; 1178 1179 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 1180 return -ENOMEM; 1181 1182 index = get_netdev_queue_index(queue); 1183 1184 rcu_read_lock(); 1185 dev_maps = rcu_dereference(dev->xps_maps); 1186 if (dev_maps) { 1187 for_each_possible_cpu(i) { 1188 struct xps_map *map = 1189 rcu_dereference(dev_maps->cpu_map[i]); 1190 if (map) { 1191 int j; 1192 for (j = 0; j < map->len; j++) { 1193 if (map->queues[j] == index) { 1194 cpumask_set_cpu(i, mask); 1195 break; 1196 } 1197 } 1198 } 1199 } 1200 } 1201 rcu_read_unlock(); 1202 1203 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 1204 free_cpumask_var(mask); 1205 return len < PAGE_SIZE ? len : -EINVAL; 1206 } 1207 1208 static ssize_t store_xps_map(struct netdev_queue *queue, 1209 struct netdev_queue_attribute *attribute, 1210 const char *buf, size_t len) 1211 { 1212 struct net_device *dev = queue->dev; 1213 unsigned long index; 1214 cpumask_var_t mask; 1215 int err; 1216 1217 if (!capable(CAP_NET_ADMIN)) 1218 return -EPERM; 1219 1220 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 1221 return -ENOMEM; 1222 1223 index = get_netdev_queue_index(queue); 1224 1225 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 1226 if (err) { 1227 free_cpumask_var(mask); 1228 return err; 1229 } 1230 1231 err = netif_set_xps_queue(dev, mask, index); 1232 1233 free_cpumask_var(mask); 1234 1235 return err ? : len; 1236 } 1237 1238 static struct netdev_queue_attribute xps_cpus_attribute = 1239 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map); 1240 #endif /* CONFIG_XPS */ 1241 1242 static struct attribute *netdev_queue_default_attrs[] = { 1243 &queue_trans_timeout.attr, 1244 #ifdef CONFIG_XPS 1245 &xps_cpus_attribute.attr, 1246 &queue_tx_maxrate.attr, 1247 #endif 1248 NULL 1249 }; 1250 1251 static void netdev_queue_release(struct kobject *kobj) 1252 { 1253 struct netdev_queue *queue = to_netdev_queue(kobj); 1254 1255 memset(kobj, 0, sizeof(*kobj)); 1256 dev_put(queue->dev); 1257 } 1258 1259 static const void *netdev_queue_namespace(struct kobject *kobj) 1260 { 1261 struct netdev_queue *queue = to_netdev_queue(kobj); 1262 struct device *dev = &queue->dev->dev; 1263 const void *ns = NULL; 1264 1265 if (dev->class && dev->class->ns_type) 1266 ns = dev->class->namespace(dev); 1267 1268 return ns; 1269 } 1270 1271 static struct kobj_type netdev_queue_ktype = { 1272 .sysfs_ops = &netdev_queue_sysfs_ops, 1273 .release = netdev_queue_release, 1274 .default_attrs = netdev_queue_default_attrs, 1275 .namespace = netdev_queue_namespace, 1276 }; 1277 1278 static int netdev_queue_add_kobject(struct net_device *dev, int index) 1279 { 1280 struct netdev_queue *queue = dev->_tx + index; 1281 struct kobject *kobj = &queue->kobj; 1282 int error = 0; 1283 1284 kobj->kset = dev->queues_kset; 1285 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, 1286 "tx-%u", index); 1287 if (error) 1288 goto exit; 1289 1290 #ifdef CONFIG_BQL 1291 error = sysfs_create_group(kobj, &dql_group); 1292 if (error) 1293 goto exit; 1294 #endif 1295 1296 kobject_uevent(kobj, KOBJ_ADD); 1297 dev_hold(queue->dev); 1298 1299 return 0; 1300 exit: 1301 kobject_put(kobj); 1302 return error; 1303 } 1304 #endif /* CONFIG_SYSFS */ 1305 1306 int 1307 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 1308 { 1309 #ifdef CONFIG_SYSFS 1310 int i; 1311 int error = 0; 1312 1313 for (i = old_num; i < new_num; i++) { 1314 error = netdev_queue_add_kobject(dev, i); 1315 if (error) { 1316 new_num = old_num; 1317 break; 1318 } 1319 } 1320 1321 while (--i >= new_num) { 1322 struct netdev_queue *queue = dev->_tx + i; 1323 1324 #ifdef CONFIG_BQL 1325 sysfs_remove_group(&queue->kobj, &dql_group); 1326 #endif 1327 kobject_put(&queue->kobj); 1328 } 1329 1330 return error; 1331 #else 1332 return 0; 1333 #endif /* CONFIG_SYSFS */ 1334 } 1335 1336 static int register_queue_kobjects(struct net_device *dev) 1337 { 1338 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; 1339 1340 #ifdef CONFIG_SYSFS 1341 dev->queues_kset = kset_create_and_add("queues", 1342 NULL, &dev->dev.kobj); 1343 if (!dev->queues_kset) 1344 return -ENOMEM; 1345 real_rx = dev->real_num_rx_queues; 1346 #endif 1347 real_tx = dev->real_num_tx_queues; 1348 1349 error = net_rx_queue_update_kobjects(dev, 0, real_rx); 1350 if (error) 1351 goto error; 1352 rxq = real_rx; 1353 1354 error = netdev_queue_update_kobjects(dev, 0, real_tx); 1355 if (error) 1356 goto error; 1357 txq = real_tx; 1358 1359 return 0; 1360 1361 error: 1362 netdev_queue_update_kobjects(dev, txq, 0); 1363 net_rx_queue_update_kobjects(dev, rxq, 0); 1364 return error; 1365 } 1366 1367 static void remove_queue_kobjects(struct net_device *dev) 1368 { 1369 int real_rx = 0, real_tx = 0; 1370 1371 #ifdef CONFIG_SYSFS 1372 real_rx = dev->real_num_rx_queues; 1373 #endif 1374 real_tx = dev->real_num_tx_queues; 1375 1376 net_rx_queue_update_kobjects(dev, real_rx, 0); 1377 netdev_queue_update_kobjects(dev, real_tx, 0); 1378 #ifdef CONFIG_SYSFS 1379 kset_unregister(dev->queues_kset); 1380 #endif 1381 } 1382 1383 static bool net_current_may_mount(void) 1384 { 1385 struct net *net = current->nsproxy->net_ns; 1386 1387 return ns_capable(net->user_ns, CAP_SYS_ADMIN); 1388 } 1389 1390 static void *net_grab_current_ns(void) 1391 { 1392 struct net *ns = current->nsproxy->net_ns; 1393 #ifdef CONFIG_NET_NS 1394 if (ns) 1395 atomic_inc(&ns->passive); 1396 #endif 1397 return ns; 1398 } 1399 1400 static const void *net_initial_ns(void) 1401 { 1402 return &init_net; 1403 } 1404 1405 static const void *net_netlink_ns(struct sock *sk) 1406 { 1407 return sock_net(sk); 1408 } 1409 1410 struct kobj_ns_type_operations net_ns_type_operations = { 1411 .type = KOBJ_NS_TYPE_NET, 1412 .current_may_mount = net_current_may_mount, 1413 .grab_current_ns = net_grab_current_ns, 1414 .netlink_ns = net_netlink_ns, 1415 .initial_ns = net_initial_ns, 1416 .drop_ns = net_drop_ns, 1417 }; 1418 EXPORT_SYMBOL_GPL(net_ns_type_operations); 1419 1420 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 1421 { 1422 struct net_device *dev = to_net_dev(d); 1423 int retval; 1424 1425 /* pass interface to uevent. */ 1426 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 1427 if (retval) 1428 goto exit; 1429 1430 /* pass ifindex to uevent. 1431 * ifindex is useful as it won't change (interface name may change) 1432 * and is what RtNetlink uses natively. */ 1433 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 1434 1435 exit: 1436 return retval; 1437 } 1438 1439 /* 1440 * netdev_release -- destroy and free a dead device. 1441 * Called when last reference to device kobject is gone. 1442 */ 1443 static void netdev_release(struct device *d) 1444 { 1445 struct net_device *dev = to_net_dev(d); 1446 1447 BUG_ON(dev->reg_state != NETREG_RELEASED); 1448 1449 kfree(dev->ifalias); 1450 netdev_freemem(dev); 1451 } 1452 1453 static const void *net_namespace(struct device *d) 1454 { 1455 struct net_device *dev; 1456 dev = container_of(d, struct net_device, dev); 1457 return dev_net(dev); 1458 } 1459 1460 static struct class net_class = { 1461 .name = "net", 1462 .dev_release = netdev_release, 1463 .dev_groups = net_class_groups, 1464 .dev_uevent = netdev_uevent, 1465 .ns_type = &net_ns_type_operations, 1466 .namespace = net_namespace, 1467 }; 1468 1469 #ifdef CONFIG_OF_NET 1470 static int of_dev_node_match(struct device *dev, const void *data) 1471 { 1472 int ret = 0; 1473 1474 if (dev->parent) 1475 ret = dev->parent->of_node == data; 1476 1477 return ret == 0 ? dev->of_node == data : ret; 1478 } 1479 1480 /* 1481 * of_find_net_device_by_node - lookup the net device for the device node 1482 * @np: OF device node 1483 * 1484 * Looks up the net_device structure corresponding with the device node. 1485 * If successful, returns a pointer to the net_device with the embedded 1486 * struct device refcount incremented by one, or NULL on failure. The 1487 * refcount must be dropped when done with the net_device. 1488 */ 1489 struct net_device *of_find_net_device_by_node(struct device_node *np) 1490 { 1491 struct device *dev; 1492 1493 dev = class_find_device(&net_class, NULL, np, of_dev_node_match); 1494 if (!dev) 1495 return NULL; 1496 1497 return to_net_dev(dev); 1498 } 1499 EXPORT_SYMBOL(of_find_net_device_by_node); 1500 #endif 1501 1502 /* Delete sysfs entries but hold kobject reference until after all 1503 * netdev references are gone. 1504 */ 1505 void netdev_unregister_kobject(struct net_device *ndev) 1506 { 1507 struct device *dev = &(ndev->dev); 1508 1509 kobject_get(&dev->kobj); 1510 1511 remove_queue_kobjects(ndev); 1512 1513 pm_runtime_set_memalloc_noio(dev, false); 1514 1515 device_del(dev); 1516 } 1517 1518 /* Create sysfs entries for network device. */ 1519 int netdev_register_kobject(struct net_device *ndev) 1520 { 1521 struct device *dev = &(ndev->dev); 1522 const struct attribute_group **groups = ndev->sysfs_groups; 1523 int error = 0; 1524 1525 device_initialize(dev); 1526 dev->class = &net_class; 1527 dev->platform_data = ndev; 1528 dev->groups = groups; 1529 1530 dev_set_name(dev, "%s", ndev->name); 1531 1532 #ifdef CONFIG_SYSFS 1533 /* Allow for a device specific group */ 1534 if (*groups) 1535 groups++; 1536 1537 *groups++ = &netstat_group; 1538 1539 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 1540 if (ndev->ieee80211_ptr) 1541 *groups++ = &wireless_group; 1542 #if IS_ENABLED(CONFIG_WIRELESS_EXT) 1543 else if (ndev->wireless_handlers) 1544 *groups++ = &wireless_group; 1545 #endif 1546 #endif 1547 #endif /* CONFIG_SYSFS */ 1548 1549 error = device_add(dev); 1550 if (error) 1551 return error; 1552 1553 error = register_queue_kobjects(ndev); 1554 if (error) { 1555 device_del(dev); 1556 return error; 1557 } 1558 1559 pm_runtime_set_memalloc_noio(dev, true); 1560 1561 return error; 1562 } 1563 1564 int netdev_class_create_file_ns(struct class_attribute *class_attr, 1565 const void *ns) 1566 { 1567 return class_create_file_ns(&net_class, class_attr, ns); 1568 } 1569 EXPORT_SYMBOL(netdev_class_create_file_ns); 1570 1571 void netdev_class_remove_file_ns(struct class_attribute *class_attr, 1572 const void *ns) 1573 { 1574 class_remove_file_ns(&net_class, class_attr, ns); 1575 } 1576 EXPORT_SYMBOL(netdev_class_remove_file_ns); 1577 1578 int __init netdev_kobject_init(void) 1579 { 1580 kobj_ns_type_register(&net_ns_type_operations); 1581 return class_register(&net_class); 1582 } 1583