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_dec[] = "%d\n"; 33 static const char fmt_ulong[] = "%lu\n"; 34 static const char fmt_u64[] = "%llu\n"; 35 36 static inline int dev_isalive(const struct net_device *dev) 37 { 38 return dev->reg_state <= NETREG_REGISTERED; 39 } 40 41 /* use same locking rules as GIF* ioctl's */ 42 static ssize_t netdev_show(const struct device *dev, 43 struct device_attribute *attr, char *buf, 44 ssize_t (*format)(const struct net_device *, char *)) 45 { 46 struct net_device *ndev = to_net_dev(dev); 47 ssize_t ret = -EINVAL; 48 49 read_lock(&dev_base_lock); 50 if (dev_isalive(ndev)) 51 ret = (*format)(ndev, buf); 52 read_unlock(&dev_base_lock); 53 54 return ret; 55 } 56 57 /* generate a show function for simple field */ 58 #define NETDEVICE_SHOW(field, format_string) \ 59 static ssize_t format_##field(const struct net_device *dev, char *buf) \ 60 { \ 61 return sprintf(buf, format_string, dev->field); \ 62 } \ 63 static ssize_t field##_show(struct device *dev, \ 64 struct device_attribute *attr, char *buf) \ 65 { \ 66 return netdev_show(dev, attr, buf, format_##field); \ 67 } \ 68 69 #define NETDEVICE_SHOW_RO(field, format_string) \ 70 NETDEVICE_SHOW(field, format_string); \ 71 static DEVICE_ATTR_RO(field) 72 73 #define NETDEVICE_SHOW_RW(field, format_string) \ 74 NETDEVICE_SHOW(field, format_string); \ 75 static DEVICE_ATTR_RW(field) 76 77 /* use same locking and permission rules as SIF* ioctl's */ 78 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, 79 const char *buf, size_t len, 80 int (*set)(struct net_device *, unsigned long)) 81 { 82 struct net_device *netdev = to_net_dev(dev); 83 struct net *net = dev_net(netdev); 84 unsigned long new; 85 int ret = -EINVAL; 86 87 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 88 return -EPERM; 89 90 ret = kstrtoul(buf, 0, &new); 91 if (ret) 92 goto err; 93 94 if (!rtnl_trylock()) 95 return restart_syscall(); 96 97 if (dev_isalive(netdev)) { 98 if ((ret = (*set)(netdev, new)) == 0) 99 ret = len; 100 } 101 rtnl_unlock(); 102 err: 103 return ret; 104 } 105 106 NETDEVICE_SHOW_RO(dev_id, fmt_hex); 107 NETDEVICE_SHOW_RO(dev_port, fmt_dec); 108 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec); 109 NETDEVICE_SHOW_RO(addr_len, fmt_dec); 110 NETDEVICE_SHOW_RO(ifindex, fmt_dec); 111 NETDEVICE_SHOW_RO(type, fmt_dec); 112 NETDEVICE_SHOW_RO(link_mode, fmt_dec); 113 114 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr, 115 char *buf) 116 { 117 struct net_device *ndev = to_net_dev(dev); 118 119 return sprintf(buf, fmt_dec, dev_get_iflink(ndev)); 120 } 121 static DEVICE_ATTR_RO(iflink); 122 123 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf) 124 { 125 return sprintf(buf, fmt_dec, dev->name_assign_type); 126 } 127 128 static ssize_t name_assign_type_show(struct device *dev, 129 struct device_attribute *attr, 130 char *buf) 131 { 132 struct net_device *ndev = to_net_dev(dev); 133 ssize_t ret = -EINVAL; 134 135 if (ndev->name_assign_type != NET_NAME_UNKNOWN) 136 ret = netdev_show(dev, attr, buf, format_name_assign_type); 137 138 return ret; 139 } 140 static DEVICE_ATTR_RO(name_assign_type); 141 142 /* use same locking rules as GIFHWADDR ioctl's */ 143 static ssize_t address_show(struct device *dev, struct device_attribute *attr, 144 char *buf) 145 { 146 struct net_device *ndev = to_net_dev(dev); 147 ssize_t ret = -EINVAL; 148 149 read_lock(&dev_base_lock); 150 if (dev_isalive(ndev)) 151 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len); 152 read_unlock(&dev_base_lock); 153 return ret; 154 } 155 static DEVICE_ATTR_RO(address); 156 157 static ssize_t broadcast_show(struct device *dev, 158 struct device_attribute *attr, char *buf) 159 { 160 struct net_device *ndev = to_net_dev(dev); 161 if (dev_isalive(ndev)) 162 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len); 163 return -EINVAL; 164 } 165 static DEVICE_ATTR_RO(broadcast); 166 167 static int change_carrier(struct net_device *dev, unsigned long new_carrier) 168 { 169 if (!netif_running(dev)) 170 return -EINVAL; 171 return dev_change_carrier(dev, (bool) new_carrier); 172 } 173 174 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr, 175 const char *buf, size_t len) 176 { 177 return netdev_store(dev, attr, buf, len, change_carrier); 178 } 179 180 static ssize_t carrier_show(struct device *dev, 181 struct device_attribute *attr, char *buf) 182 { 183 struct net_device *netdev = to_net_dev(dev); 184 if (netif_running(netdev)) { 185 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); 186 } 187 return -EINVAL; 188 } 189 static DEVICE_ATTR_RW(carrier); 190 191 static ssize_t speed_show(struct device *dev, 192 struct device_attribute *attr, char *buf) 193 { 194 struct net_device *netdev = to_net_dev(dev); 195 int ret = -EINVAL; 196 197 if (!rtnl_trylock()) 198 return restart_syscall(); 199 200 if (netif_running(netdev)) { 201 struct ethtool_link_ksettings cmd; 202 203 if (!__ethtool_get_link_ksettings(netdev, &cmd)) 204 ret = sprintf(buf, fmt_dec, cmd.base.speed); 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_link_ksettings cmd; 222 223 if (!__ethtool_get_link_ksettings(netdev, &cmd)) { 224 const char *duplex; 225 226 switch (cmd.base.duplex) { 227 case DUPLEX_HALF: 228 duplex = "half"; 229 break; 230 case DUPLEX_FULL: 231 duplex = "full"; 232 break; 233 default: 234 duplex = "unknown"; 235 break; 236 } 237 ret = sprintf(buf, "%s\n", duplex); 238 } 239 } 240 rtnl_unlock(); 241 return ret; 242 } 243 static DEVICE_ATTR_RO(duplex); 244 245 static ssize_t dormant_show(struct device *dev, 246 struct device_attribute *attr, char *buf) 247 { 248 struct net_device *netdev = to_net_dev(dev); 249 250 if (netif_running(netdev)) 251 return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); 252 253 return -EINVAL; 254 } 255 static DEVICE_ATTR_RO(dormant); 256 257 static const char *const operstates[] = { 258 "unknown", 259 "notpresent", /* currently unused */ 260 "down", 261 "lowerlayerdown", 262 "testing", /* currently unused */ 263 "dormant", 264 "up" 265 }; 266 267 static ssize_t operstate_show(struct device *dev, 268 struct device_attribute *attr, char *buf) 269 { 270 const struct net_device *netdev = to_net_dev(dev); 271 unsigned char operstate; 272 273 read_lock(&dev_base_lock); 274 operstate = netdev->operstate; 275 if (!netif_running(netdev)) 276 operstate = IF_OPER_DOWN; 277 read_unlock(&dev_base_lock); 278 279 if (operstate >= ARRAY_SIZE(operstates)) 280 return -EINVAL; /* should not happen */ 281 282 return sprintf(buf, "%s\n", operstates[operstate]); 283 } 284 static DEVICE_ATTR_RO(operstate); 285 286 static ssize_t carrier_changes_show(struct device *dev, 287 struct device_attribute *attr, 288 char *buf) 289 { 290 struct net_device *netdev = to_net_dev(dev); 291 return sprintf(buf, fmt_dec, 292 atomic_read(&netdev->carrier_changes)); 293 } 294 static DEVICE_ATTR_RO(carrier_changes); 295 296 /* read-write attributes */ 297 298 static int change_mtu(struct net_device *dev, unsigned long new_mtu) 299 { 300 return dev_set_mtu(dev, (int) new_mtu); 301 } 302 303 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr, 304 const char *buf, size_t len) 305 { 306 return netdev_store(dev, attr, buf, len, change_mtu); 307 } 308 NETDEVICE_SHOW_RW(mtu, fmt_dec); 309 310 static int change_flags(struct net_device *dev, unsigned long new_flags) 311 { 312 return dev_change_flags(dev, (unsigned int) new_flags); 313 } 314 315 static ssize_t flags_store(struct device *dev, struct device_attribute *attr, 316 const char *buf, size_t len) 317 { 318 return netdev_store(dev, attr, buf, len, change_flags); 319 } 320 NETDEVICE_SHOW_RW(flags, fmt_hex); 321 322 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len) 323 { 324 dev->tx_queue_len = new_len; 325 return 0; 326 } 327 328 static ssize_t tx_queue_len_store(struct device *dev, 329 struct device_attribute *attr, 330 const char *buf, size_t len) 331 { 332 if (!capable(CAP_NET_ADMIN)) 333 return -EPERM; 334 335 return netdev_store(dev, attr, buf, len, change_tx_queue_len); 336 } 337 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong); 338 339 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val) 340 { 341 dev->gro_flush_timeout = val; 342 return 0; 343 } 344 345 static ssize_t gro_flush_timeout_store(struct device *dev, 346 struct device_attribute *attr, 347 const char *buf, size_t len) 348 { 349 if (!capable(CAP_NET_ADMIN)) 350 return -EPERM; 351 352 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout); 353 } 354 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong); 355 356 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr, 357 const char *buf, size_t len) 358 { 359 struct net_device *netdev = to_net_dev(dev); 360 struct net *net = dev_net(netdev); 361 size_t count = len; 362 ssize_t ret; 363 364 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 365 return -EPERM; 366 367 /* ignore trailing newline */ 368 if (len > 0 && buf[len - 1] == '\n') 369 --count; 370 371 if (!rtnl_trylock()) 372 return restart_syscall(); 373 ret = dev_set_alias(netdev, buf, count); 374 rtnl_unlock(); 375 376 return ret < 0 ? ret : len; 377 } 378 379 static ssize_t ifalias_show(struct device *dev, 380 struct device_attribute *attr, char *buf) 381 { 382 const struct net_device *netdev = to_net_dev(dev); 383 ssize_t ret = 0; 384 385 if (!rtnl_trylock()) 386 return restart_syscall(); 387 if (netdev->ifalias) 388 ret = sprintf(buf, "%s\n", netdev->ifalias); 389 rtnl_unlock(); 390 return ret; 391 } 392 static DEVICE_ATTR_RW(ifalias); 393 394 static int change_group(struct net_device *dev, unsigned long new_group) 395 { 396 dev_set_group(dev, (int) new_group); 397 return 0; 398 } 399 400 static ssize_t group_store(struct device *dev, struct device_attribute *attr, 401 const char *buf, size_t len) 402 { 403 return netdev_store(dev, attr, buf, len, change_group); 404 } 405 NETDEVICE_SHOW(group, fmt_dec); 406 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store); 407 408 static int change_proto_down(struct net_device *dev, unsigned long proto_down) 409 { 410 return dev_change_proto_down(dev, (bool) proto_down); 411 } 412 413 static ssize_t proto_down_store(struct device *dev, 414 struct device_attribute *attr, 415 const char *buf, size_t len) 416 { 417 return netdev_store(dev, attr, buf, len, change_proto_down); 418 } 419 NETDEVICE_SHOW_RW(proto_down, fmt_dec); 420 421 static ssize_t phys_port_id_show(struct device *dev, 422 struct device_attribute *attr, char *buf) 423 { 424 struct net_device *netdev = to_net_dev(dev); 425 ssize_t ret = -EINVAL; 426 427 if (!rtnl_trylock()) 428 return restart_syscall(); 429 430 if (dev_isalive(netdev)) { 431 struct netdev_phys_item_id ppid; 432 433 ret = dev_get_phys_port_id(netdev, &ppid); 434 if (!ret) 435 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); 436 } 437 rtnl_unlock(); 438 439 return ret; 440 } 441 static DEVICE_ATTR_RO(phys_port_id); 442 443 static ssize_t phys_port_name_show(struct device *dev, 444 struct device_attribute *attr, char *buf) 445 { 446 struct net_device *netdev = to_net_dev(dev); 447 ssize_t ret = -EINVAL; 448 449 if (!rtnl_trylock()) 450 return restart_syscall(); 451 452 if (dev_isalive(netdev)) { 453 char name[IFNAMSIZ]; 454 455 ret = dev_get_phys_port_name(netdev, name, sizeof(name)); 456 if (!ret) 457 ret = sprintf(buf, "%s\n", name); 458 } 459 rtnl_unlock(); 460 461 return ret; 462 } 463 static DEVICE_ATTR_RO(phys_port_name); 464 465 static ssize_t phys_switch_id_show(struct device *dev, 466 struct device_attribute *attr, char *buf) 467 { 468 struct net_device *netdev = to_net_dev(dev); 469 ssize_t ret = -EINVAL; 470 471 if (!rtnl_trylock()) 472 return restart_syscall(); 473 474 if (dev_isalive(netdev)) { 475 struct switchdev_attr attr = { 476 .orig_dev = netdev, 477 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 478 .flags = SWITCHDEV_F_NO_RECURSE, 479 }; 480 481 ret = switchdev_port_attr_get(netdev, &attr); 482 if (!ret) 483 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len, 484 attr.u.ppid.id); 485 } 486 rtnl_unlock(); 487 488 return ret; 489 } 490 static DEVICE_ATTR_RO(phys_switch_id); 491 492 static struct attribute *net_class_attrs[] = { 493 &dev_attr_netdev_group.attr, 494 &dev_attr_type.attr, 495 &dev_attr_dev_id.attr, 496 &dev_attr_dev_port.attr, 497 &dev_attr_iflink.attr, 498 &dev_attr_ifindex.attr, 499 &dev_attr_name_assign_type.attr, 500 &dev_attr_addr_assign_type.attr, 501 &dev_attr_addr_len.attr, 502 &dev_attr_link_mode.attr, 503 &dev_attr_address.attr, 504 &dev_attr_broadcast.attr, 505 &dev_attr_speed.attr, 506 &dev_attr_duplex.attr, 507 &dev_attr_dormant.attr, 508 &dev_attr_operstate.attr, 509 &dev_attr_carrier_changes.attr, 510 &dev_attr_ifalias.attr, 511 &dev_attr_carrier.attr, 512 &dev_attr_mtu.attr, 513 &dev_attr_flags.attr, 514 &dev_attr_tx_queue_len.attr, 515 &dev_attr_gro_flush_timeout.attr, 516 &dev_attr_phys_port_id.attr, 517 &dev_attr_phys_port_name.attr, 518 &dev_attr_phys_switch_id.attr, 519 &dev_attr_proto_down.attr, 520 NULL, 521 }; 522 ATTRIBUTE_GROUPS(net_class); 523 524 /* Show a given an attribute in the statistics group */ 525 static ssize_t netstat_show(const struct device *d, 526 struct device_attribute *attr, char *buf, 527 unsigned long offset) 528 { 529 struct net_device *dev = to_net_dev(d); 530 ssize_t ret = -EINVAL; 531 532 WARN_ON(offset > sizeof(struct rtnl_link_stats64) || 533 offset % sizeof(u64) != 0); 534 535 read_lock(&dev_base_lock); 536 if (dev_isalive(dev)) { 537 struct rtnl_link_stats64 temp; 538 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 539 540 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset)); 541 } 542 read_unlock(&dev_base_lock); 543 return ret; 544 } 545 546 /* generate a read-only statistics attribute */ 547 #define NETSTAT_ENTRY(name) \ 548 static ssize_t name##_show(struct device *d, \ 549 struct device_attribute *attr, char *buf) \ 550 { \ 551 return netstat_show(d, attr, buf, \ 552 offsetof(struct rtnl_link_stats64, name)); \ 553 } \ 554 static DEVICE_ATTR_RO(name) 555 556 NETSTAT_ENTRY(rx_packets); 557 NETSTAT_ENTRY(tx_packets); 558 NETSTAT_ENTRY(rx_bytes); 559 NETSTAT_ENTRY(tx_bytes); 560 NETSTAT_ENTRY(rx_errors); 561 NETSTAT_ENTRY(tx_errors); 562 NETSTAT_ENTRY(rx_dropped); 563 NETSTAT_ENTRY(tx_dropped); 564 NETSTAT_ENTRY(multicast); 565 NETSTAT_ENTRY(collisions); 566 NETSTAT_ENTRY(rx_length_errors); 567 NETSTAT_ENTRY(rx_over_errors); 568 NETSTAT_ENTRY(rx_crc_errors); 569 NETSTAT_ENTRY(rx_frame_errors); 570 NETSTAT_ENTRY(rx_fifo_errors); 571 NETSTAT_ENTRY(rx_missed_errors); 572 NETSTAT_ENTRY(tx_aborted_errors); 573 NETSTAT_ENTRY(tx_carrier_errors); 574 NETSTAT_ENTRY(tx_fifo_errors); 575 NETSTAT_ENTRY(tx_heartbeat_errors); 576 NETSTAT_ENTRY(tx_window_errors); 577 NETSTAT_ENTRY(rx_compressed); 578 NETSTAT_ENTRY(tx_compressed); 579 NETSTAT_ENTRY(rx_nohandler); 580 581 static struct attribute *netstat_attrs[] = { 582 &dev_attr_rx_packets.attr, 583 &dev_attr_tx_packets.attr, 584 &dev_attr_rx_bytes.attr, 585 &dev_attr_tx_bytes.attr, 586 &dev_attr_rx_errors.attr, 587 &dev_attr_tx_errors.attr, 588 &dev_attr_rx_dropped.attr, 589 &dev_attr_tx_dropped.attr, 590 &dev_attr_multicast.attr, 591 &dev_attr_collisions.attr, 592 &dev_attr_rx_length_errors.attr, 593 &dev_attr_rx_over_errors.attr, 594 &dev_attr_rx_crc_errors.attr, 595 &dev_attr_rx_frame_errors.attr, 596 &dev_attr_rx_fifo_errors.attr, 597 &dev_attr_rx_missed_errors.attr, 598 &dev_attr_tx_aborted_errors.attr, 599 &dev_attr_tx_carrier_errors.attr, 600 &dev_attr_tx_fifo_errors.attr, 601 &dev_attr_tx_heartbeat_errors.attr, 602 &dev_attr_tx_window_errors.attr, 603 &dev_attr_rx_compressed.attr, 604 &dev_attr_tx_compressed.attr, 605 &dev_attr_rx_nohandler.attr, 606 NULL 607 }; 608 609 610 static struct attribute_group netstat_group = { 611 .name = "statistics", 612 .attrs = netstat_attrs, 613 }; 614 615 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 616 static struct attribute *wireless_attrs[] = { 617 NULL 618 }; 619 620 static struct attribute_group wireless_group = { 621 .name = "wireless", 622 .attrs = wireless_attrs, 623 }; 624 #endif 625 626 #else /* CONFIG_SYSFS */ 627 #define net_class_groups NULL 628 #endif /* CONFIG_SYSFS */ 629 630 #ifdef CONFIG_SYSFS 631 #define to_rx_queue_attr(_attr) container_of(_attr, \ 632 struct rx_queue_attribute, attr) 633 634 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 635 636 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 637 char *buf) 638 { 639 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 640 struct netdev_rx_queue *queue = to_rx_queue(kobj); 641 642 if (!attribute->show) 643 return -EIO; 644 645 return attribute->show(queue, attribute, buf); 646 } 647 648 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 649 const char *buf, size_t count) 650 { 651 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 652 struct netdev_rx_queue *queue = to_rx_queue(kobj); 653 654 if (!attribute->store) 655 return -EIO; 656 657 return attribute->store(queue, attribute, buf, count); 658 } 659 660 static const struct sysfs_ops rx_queue_sysfs_ops = { 661 .show = rx_queue_attr_show, 662 .store = rx_queue_attr_store, 663 }; 664 665 #ifdef CONFIG_RPS 666 static ssize_t show_rps_map(struct netdev_rx_queue *queue, 667 struct rx_queue_attribute *attribute, char *buf) 668 { 669 struct rps_map *map; 670 cpumask_var_t mask; 671 int i, len; 672 673 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 674 return -ENOMEM; 675 676 rcu_read_lock(); 677 map = rcu_dereference(queue->rps_map); 678 if (map) 679 for (i = 0; i < map->len; i++) 680 cpumask_set_cpu(map->cpus[i], mask); 681 682 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 683 rcu_read_unlock(); 684 free_cpumask_var(mask); 685 686 return len < PAGE_SIZE ? len : -EINVAL; 687 } 688 689 static ssize_t store_rps_map(struct netdev_rx_queue *queue, 690 struct rx_queue_attribute *attribute, 691 const char *buf, size_t len) 692 { 693 struct rps_map *old_map, *map; 694 cpumask_var_t mask; 695 int err, cpu, i; 696 static DEFINE_MUTEX(rps_map_mutex); 697 698 if (!capable(CAP_NET_ADMIN)) 699 return -EPERM; 700 701 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 702 return -ENOMEM; 703 704 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 705 if (err) { 706 free_cpumask_var(mask); 707 return err; 708 } 709 710 map = kzalloc(max_t(unsigned int, 711 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 712 GFP_KERNEL); 713 if (!map) { 714 free_cpumask_var(mask); 715 return -ENOMEM; 716 } 717 718 i = 0; 719 for_each_cpu_and(cpu, mask, cpu_online_mask) 720 map->cpus[i++] = cpu; 721 722 if (i) 723 map->len = i; 724 else { 725 kfree(map); 726 map = NULL; 727 } 728 729 mutex_lock(&rps_map_mutex); 730 old_map = rcu_dereference_protected(queue->rps_map, 731 mutex_is_locked(&rps_map_mutex)); 732 rcu_assign_pointer(queue->rps_map, map); 733 734 if (map) 735 static_key_slow_inc(&rps_needed); 736 if (old_map) 737 static_key_slow_dec(&rps_needed); 738 739 mutex_unlock(&rps_map_mutex); 740 741 if (old_map) 742 kfree_rcu(old_map, rcu); 743 744 free_cpumask_var(mask); 745 return len; 746 } 747 748 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 749 struct rx_queue_attribute *attr, 750 char *buf) 751 { 752 struct rps_dev_flow_table *flow_table; 753 unsigned long val = 0; 754 755 rcu_read_lock(); 756 flow_table = rcu_dereference(queue->rps_flow_table); 757 if (flow_table) 758 val = (unsigned long)flow_table->mask + 1; 759 rcu_read_unlock(); 760 761 return sprintf(buf, "%lu\n", val); 762 } 763 764 static void rps_dev_flow_table_release(struct rcu_head *rcu) 765 { 766 struct rps_dev_flow_table *table = container_of(rcu, 767 struct rps_dev_flow_table, rcu); 768 vfree(table); 769 } 770 771 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 772 struct rx_queue_attribute *attr, 773 const char *buf, size_t len) 774 { 775 unsigned long mask, count; 776 struct rps_dev_flow_table *table, *old_table; 777 static DEFINE_SPINLOCK(rps_dev_flow_lock); 778 int rc; 779 780 if (!capable(CAP_NET_ADMIN)) 781 return -EPERM; 782 783 rc = kstrtoul(buf, 0, &count); 784 if (rc < 0) 785 return rc; 786 787 if (count) { 788 mask = count - 1; 789 /* mask = roundup_pow_of_two(count) - 1; 790 * without overflows... 791 */ 792 while ((mask | (mask >> 1)) != mask) 793 mask |= (mask >> 1); 794 /* On 64 bit arches, must check mask fits in table->mask (u32), 795 * and on 32bit arches, must check 796 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow. 797 */ 798 #if BITS_PER_LONG > 32 799 if (mask > (unsigned long)(u32)mask) 800 return -EINVAL; 801 #else 802 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) 803 / sizeof(struct rps_dev_flow)) { 804 /* Enforce a limit to prevent overflow */ 805 return -EINVAL; 806 } 807 #endif 808 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); 809 if (!table) 810 return -ENOMEM; 811 812 table->mask = mask; 813 for (count = 0; count <= mask; count++) 814 table->flows[count].cpu = RPS_NO_CPU; 815 } else 816 table = NULL; 817 818 spin_lock(&rps_dev_flow_lock); 819 old_table = rcu_dereference_protected(queue->rps_flow_table, 820 lockdep_is_held(&rps_dev_flow_lock)); 821 rcu_assign_pointer(queue->rps_flow_table, table); 822 spin_unlock(&rps_dev_flow_lock); 823 824 if (old_table) 825 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 826 827 return len; 828 } 829 830 static struct rx_queue_attribute rps_cpus_attribute = 831 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); 832 833 834 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = 835 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, 836 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 837 #endif /* CONFIG_RPS */ 838 839 static struct attribute *rx_queue_default_attrs[] = { 840 #ifdef CONFIG_RPS 841 &rps_cpus_attribute.attr, 842 &rps_dev_flow_table_cnt_attribute.attr, 843 #endif 844 NULL 845 }; 846 847 static void rx_queue_release(struct kobject *kobj) 848 { 849 struct netdev_rx_queue *queue = to_rx_queue(kobj); 850 #ifdef CONFIG_RPS 851 struct rps_map *map; 852 struct rps_dev_flow_table *flow_table; 853 854 855 map = rcu_dereference_protected(queue->rps_map, 1); 856 if (map) { 857 RCU_INIT_POINTER(queue->rps_map, NULL); 858 kfree_rcu(map, rcu); 859 } 860 861 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); 862 if (flow_table) { 863 RCU_INIT_POINTER(queue->rps_flow_table, NULL); 864 call_rcu(&flow_table->rcu, rps_dev_flow_table_release); 865 } 866 #endif 867 868 memset(kobj, 0, sizeof(*kobj)); 869 dev_put(queue->dev); 870 } 871 872 static const void *rx_queue_namespace(struct kobject *kobj) 873 { 874 struct netdev_rx_queue *queue = to_rx_queue(kobj); 875 struct device *dev = &queue->dev->dev; 876 const void *ns = NULL; 877 878 if (dev->class && dev->class->ns_type) 879 ns = dev->class->namespace(dev); 880 881 return ns; 882 } 883 884 static struct kobj_type rx_queue_ktype = { 885 .sysfs_ops = &rx_queue_sysfs_ops, 886 .release = rx_queue_release, 887 .default_attrs = rx_queue_default_attrs, 888 .namespace = rx_queue_namespace 889 }; 890 891 static int rx_queue_add_kobject(struct net_device *dev, int index) 892 { 893 struct netdev_rx_queue *queue = dev->_rx + index; 894 struct kobject *kobj = &queue->kobj; 895 int error = 0; 896 897 kobj->kset = dev->queues_kset; 898 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 899 "rx-%u", index); 900 if (error) 901 goto exit; 902 903 if (dev->sysfs_rx_queue_group) { 904 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); 905 if (error) 906 goto exit; 907 } 908 909 kobject_uevent(kobj, KOBJ_ADD); 910 dev_hold(queue->dev); 911 912 return error; 913 exit: 914 kobject_put(kobj); 915 return error; 916 } 917 #endif /* CONFIG_SYSFS */ 918 919 int 920 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 921 { 922 #ifdef CONFIG_SYSFS 923 int i; 924 int error = 0; 925 926 #ifndef CONFIG_RPS 927 if (!dev->sysfs_rx_queue_group) 928 return 0; 929 #endif 930 for (i = old_num; i < new_num; i++) { 931 error = rx_queue_add_kobject(dev, i); 932 if (error) { 933 new_num = old_num; 934 break; 935 } 936 } 937 938 while (--i >= new_num) { 939 if (dev->sysfs_rx_queue_group) 940 sysfs_remove_group(&dev->_rx[i].kobj, 941 dev->sysfs_rx_queue_group); 942 kobject_put(&dev->_rx[i].kobj); 943 } 944 945 return error; 946 #else 947 return 0; 948 #endif 949 } 950 951 #ifdef CONFIG_SYSFS 952 /* 953 * netdev_queue sysfs structures and functions. 954 */ 955 struct netdev_queue_attribute { 956 struct attribute attr; 957 ssize_t (*show)(struct netdev_queue *queue, 958 struct netdev_queue_attribute *attr, char *buf); 959 ssize_t (*store)(struct netdev_queue *queue, 960 struct netdev_queue_attribute *attr, const char *buf, size_t len); 961 }; 962 #define to_netdev_queue_attr(_attr) container_of(_attr, \ 963 struct netdev_queue_attribute, attr) 964 965 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) 966 967 static ssize_t netdev_queue_attr_show(struct kobject *kobj, 968 struct attribute *attr, char *buf) 969 { 970 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 971 struct netdev_queue *queue = to_netdev_queue(kobj); 972 973 if (!attribute->show) 974 return -EIO; 975 976 return attribute->show(queue, attribute, buf); 977 } 978 979 static ssize_t netdev_queue_attr_store(struct kobject *kobj, 980 struct attribute *attr, 981 const char *buf, size_t count) 982 { 983 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 984 struct netdev_queue *queue = to_netdev_queue(kobj); 985 986 if (!attribute->store) 987 return -EIO; 988 989 return attribute->store(queue, attribute, buf, count); 990 } 991 992 static const struct sysfs_ops netdev_queue_sysfs_ops = { 993 .show = netdev_queue_attr_show, 994 .store = netdev_queue_attr_store, 995 }; 996 997 static ssize_t show_trans_timeout(struct netdev_queue *queue, 998 struct netdev_queue_attribute *attribute, 999 char *buf) 1000 { 1001 unsigned long trans_timeout; 1002 1003 spin_lock_irq(&queue->_xmit_lock); 1004 trans_timeout = queue->trans_timeout; 1005 spin_unlock_irq(&queue->_xmit_lock); 1006 1007 return sprintf(buf, "%lu", trans_timeout); 1008 } 1009 1010 #ifdef CONFIG_XPS 1011 static unsigned int get_netdev_queue_index(struct netdev_queue *queue) 1012 { 1013 struct net_device *dev = queue->dev; 1014 unsigned int i; 1015 1016 i = queue - dev->_tx; 1017 BUG_ON(i >= dev->num_tx_queues); 1018 1019 return i; 1020 } 1021 1022 static ssize_t show_tx_maxrate(struct netdev_queue *queue, 1023 struct netdev_queue_attribute *attribute, 1024 char *buf) 1025 { 1026 return sprintf(buf, "%lu\n", queue->tx_maxrate); 1027 } 1028 1029 static ssize_t set_tx_maxrate(struct netdev_queue *queue, 1030 struct netdev_queue_attribute *attribute, 1031 const char *buf, size_t len) 1032 { 1033 struct net_device *dev = queue->dev; 1034 int err, index = get_netdev_queue_index(queue); 1035 u32 rate = 0; 1036 1037 err = kstrtou32(buf, 10, &rate); 1038 if (err < 0) 1039 return err; 1040 1041 if (!rtnl_trylock()) 1042 return restart_syscall(); 1043 1044 err = -EOPNOTSUPP; 1045 if (dev->netdev_ops->ndo_set_tx_maxrate) 1046 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate); 1047 1048 rtnl_unlock(); 1049 if (!err) { 1050 queue->tx_maxrate = rate; 1051 return len; 1052 } 1053 return err; 1054 } 1055 1056 static struct netdev_queue_attribute queue_tx_maxrate = 1057 __ATTR(tx_maxrate, S_IRUGO | S_IWUSR, 1058 show_tx_maxrate, set_tx_maxrate); 1059 #endif 1060 1061 static struct netdev_queue_attribute queue_trans_timeout = 1062 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL); 1063 1064 #ifdef CONFIG_BQL 1065 /* 1066 * Byte queue limits sysfs structures and functions. 1067 */ 1068 static ssize_t bql_show(char *buf, unsigned int value) 1069 { 1070 return sprintf(buf, "%u\n", value); 1071 } 1072 1073 static ssize_t bql_set(const char *buf, const size_t count, 1074 unsigned int *pvalue) 1075 { 1076 unsigned int value; 1077 int err; 1078 1079 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) 1080 value = DQL_MAX_LIMIT; 1081 else { 1082 err = kstrtouint(buf, 10, &value); 1083 if (err < 0) 1084 return err; 1085 if (value > DQL_MAX_LIMIT) 1086 return -EINVAL; 1087 } 1088 1089 *pvalue = value; 1090 1091 return count; 1092 } 1093 1094 static ssize_t bql_show_hold_time(struct netdev_queue *queue, 1095 struct netdev_queue_attribute *attr, 1096 char *buf) 1097 { 1098 struct dql *dql = &queue->dql; 1099 1100 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); 1101 } 1102 1103 static ssize_t bql_set_hold_time(struct netdev_queue *queue, 1104 struct netdev_queue_attribute *attribute, 1105 const char *buf, size_t len) 1106 { 1107 struct dql *dql = &queue->dql; 1108 unsigned int value; 1109 int err; 1110 1111 err = kstrtouint(buf, 10, &value); 1112 if (err < 0) 1113 return err; 1114 1115 dql->slack_hold_time = msecs_to_jiffies(value); 1116 1117 return len; 1118 } 1119 1120 static struct netdev_queue_attribute bql_hold_time_attribute = 1121 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time, 1122 bql_set_hold_time); 1123 1124 static ssize_t bql_show_inflight(struct netdev_queue *queue, 1125 struct netdev_queue_attribute *attr, 1126 char *buf) 1127 { 1128 struct dql *dql = &queue->dql; 1129 1130 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); 1131 } 1132 1133 static struct netdev_queue_attribute bql_inflight_attribute = 1134 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL); 1135 1136 #define BQL_ATTR(NAME, FIELD) \ 1137 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ 1138 struct netdev_queue_attribute *attr, \ 1139 char *buf) \ 1140 { \ 1141 return bql_show(buf, queue->dql.FIELD); \ 1142 } \ 1143 \ 1144 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ 1145 struct netdev_queue_attribute *attr, \ 1146 const char *buf, size_t len) \ 1147 { \ 1148 return bql_set(buf, len, &queue->dql.FIELD); \ 1149 } \ 1150 \ 1151 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \ 1152 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \ 1153 bql_set_ ## NAME); 1154 1155 BQL_ATTR(limit, limit) 1156 BQL_ATTR(limit_max, max_limit) 1157 BQL_ATTR(limit_min, min_limit) 1158 1159 static struct attribute *dql_attrs[] = { 1160 &bql_limit_attribute.attr, 1161 &bql_limit_max_attribute.attr, 1162 &bql_limit_min_attribute.attr, 1163 &bql_hold_time_attribute.attr, 1164 &bql_inflight_attribute.attr, 1165 NULL 1166 }; 1167 1168 static struct attribute_group dql_group = { 1169 .name = "byte_queue_limits", 1170 .attrs = dql_attrs, 1171 }; 1172 #endif /* CONFIG_BQL */ 1173 1174 #ifdef CONFIG_XPS 1175 static ssize_t show_xps_map(struct netdev_queue *queue, 1176 struct netdev_queue_attribute *attribute, char *buf) 1177 { 1178 struct net_device *dev = queue->dev; 1179 struct xps_dev_maps *dev_maps; 1180 cpumask_var_t mask; 1181 unsigned long index; 1182 int i, len; 1183 1184 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 1185 return -ENOMEM; 1186 1187 index = get_netdev_queue_index(queue); 1188 1189 rcu_read_lock(); 1190 dev_maps = rcu_dereference(dev->xps_maps); 1191 if (dev_maps) { 1192 for_each_possible_cpu(i) { 1193 struct xps_map *map = 1194 rcu_dereference(dev_maps->cpu_map[i]); 1195 if (map) { 1196 int j; 1197 for (j = 0; j < map->len; j++) { 1198 if (map->queues[j] == index) { 1199 cpumask_set_cpu(i, mask); 1200 break; 1201 } 1202 } 1203 } 1204 } 1205 } 1206 rcu_read_unlock(); 1207 1208 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 1209 free_cpumask_var(mask); 1210 return len < PAGE_SIZE ? len : -EINVAL; 1211 } 1212 1213 static ssize_t store_xps_map(struct netdev_queue *queue, 1214 struct netdev_queue_attribute *attribute, 1215 const char *buf, size_t len) 1216 { 1217 struct net_device *dev = queue->dev; 1218 unsigned long index; 1219 cpumask_var_t mask; 1220 int err; 1221 1222 if (!capable(CAP_NET_ADMIN)) 1223 return -EPERM; 1224 1225 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 1226 return -ENOMEM; 1227 1228 index = get_netdev_queue_index(queue); 1229 1230 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 1231 if (err) { 1232 free_cpumask_var(mask); 1233 return err; 1234 } 1235 1236 err = netif_set_xps_queue(dev, mask, index); 1237 1238 free_cpumask_var(mask); 1239 1240 return err ? : len; 1241 } 1242 1243 static struct netdev_queue_attribute xps_cpus_attribute = 1244 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map); 1245 #endif /* CONFIG_XPS */ 1246 1247 static struct attribute *netdev_queue_default_attrs[] = { 1248 &queue_trans_timeout.attr, 1249 #ifdef CONFIG_XPS 1250 &xps_cpus_attribute.attr, 1251 &queue_tx_maxrate.attr, 1252 #endif 1253 NULL 1254 }; 1255 1256 static void netdev_queue_release(struct kobject *kobj) 1257 { 1258 struct netdev_queue *queue = to_netdev_queue(kobj); 1259 1260 memset(kobj, 0, sizeof(*kobj)); 1261 dev_put(queue->dev); 1262 } 1263 1264 static const void *netdev_queue_namespace(struct kobject *kobj) 1265 { 1266 struct netdev_queue *queue = to_netdev_queue(kobj); 1267 struct device *dev = &queue->dev->dev; 1268 const void *ns = NULL; 1269 1270 if (dev->class && dev->class->ns_type) 1271 ns = dev->class->namespace(dev); 1272 1273 return ns; 1274 } 1275 1276 static struct kobj_type netdev_queue_ktype = { 1277 .sysfs_ops = &netdev_queue_sysfs_ops, 1278 .release = netdev_queue_release, 1279 .default_attrs = netdev_queue_default_attrs, 1280 .namespace = netdev_queue_namespace, 1281 }; 1282 1283 static int netdev_queue_add_kobject(struct net_device *dev, int index) 1284 { 1285 struct netdev_queue *queue = dev->_tx + index; 1286 struct kobject *kobj = &queue->kobj; 1287 int error = 0; 1288 1289 kobj->kset = dev->queues_kset; 1290 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, 1291 "tx-%u", index); 1292 if (error) 1293 goto exit; 1294 1295 #ifdef CONFIG_BQL 1296 error = sysfs_create_group(kobj, &dql_group); 1297 if (error) 1298 goto exit; 1299 #endif 1300 1301 kobject_uevent(kobj, KOBJ_ADD); 1302 dev_hold(queue->dev); 1303 1304 return 0; 1305 exit: 1306 kobject_put(kobj); 1307 return error; 1308 } 1309 #endif /* CONFIG_SYSFS */ 1310 1311 int 1312 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 1313 { 1314 #ifdef CONFIG_SYSFS 1315 int i; 1316 int error = 0; 1317 1318 for (i = old_num; i < new_num; i++) { 1319 error = netdev_queue_add_kobject(dev, i); 1320 if (error) { 1321 new_num = old_num; 1322 break; 1323 } 1324 } 1325 1326 while (--i >= new_num) { 1327 struct netdev_queue *queue = dev->_tx + i; 1328 1329 #ifdef CONFIG_BQL 1330 sysfs_remove_group(&queue->kobj, &dql_group); 1331 #endif 1332 kobject_put(&queue->kobj); 1333 } 1334 1335 return error; 1336 #else 1337 return 0; 1338 #endif /* CONFIG_SYSFS */ 1339 } 1340 1341 static int register_queue_kobjects(struct net_device *dev) 1342 { 1343 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; 1344 1345 #ifdef CONFIG_SYSFS 1346 dev->queues_kset = kset_create_and_add("queues", 1347 NULL, &dev->dev.kobj); 1348 if (!dev->queues_kset) 1349 return -ENOMEM; 1350 real_rx = dev->real_num_rx_queues; 1351 #endif 1352 real_tx = dev->real_num_tx_queues; 1353 1354 error = net_rx_queue_update_kobjects(dev, 0, real_rx); 1355 if (error) 1356 goto error; 1357 rxq = real_rx; 1358 1359 error = netdev_queue_update_kobjects(dev, 0, real_tx); 1360 if (error) 1361 goto error; 1362 txq = real_tx; 1363 1364 return 0; 1365 1366 error: 1367 netdev_queue_update_kobjects(dev, txq, 0); 1368 net_rx_queue_update_kobjects(dev, rxq, 0); 1369 return error; 1370 } 1371 1372 static void remove_queue_kobjects(struct net_device *dev) 1373 { 1374 int real_rx = 0, real_tx = 0; 1375 1376 #ifdef CONFIG_SYSFS 1377 real_rx = dev->real_num_rx_queues; 1378 #endif 1379 real_tx = dev->real_num_tx_queues; 1380 1381 net_rx_queue_update_kobjects(dev, real_rx, 0); 1382 netdev_queue_update_kobjects(dev, real_tx, 0); 1383 #ifdef CONFIG_SYSFS 1384 kset_unregister(dev->queues_kset); 1385 #endif 1386 } 1387 1388 static bool net_current_may_mount(void) 1389 { 1390 struct net *net = current->nsproxy->net_ns; 1391 1392 return ns_capable(net->user_ns, CAP_SYS_ADMIN); 1393 } 1394 1395 static void *net_grab_current_ns(void) 1396 { 1397 struct net *ns = current->nsproxy->net_ns; 1398 #ifdef CONFIG_NET_NS 1399 if (ns) 1400 atomic_inc(&ns->passive); 1401 #endif 1402 return ns; 1403 } 1404 1405 static const void *net_initial_ns(void) 1406 { 1407 return &init_net; 1408 } 1409 1410 static const void *net_netlink_ns(struct sock *sk) 1411 { 1412 return sock_net(sk); 1413 } 1414 1415 struct kobj_ns_type_operations net_ns_type_operations = { 1416 .type = KOBJ_NS_TYPE_NET, 1417 .current_may_mount = net_current_may_mount, 1418 .grab_current_ns = net_grab_current_ns, 1419 .netlink_ns = net_netlink_ns, 1420 .initial_ns = net_initial_ns, 1421 .drop_ns = net_drop_ns, 1422 }; 1423 EXPORT_SYMBOL_GPL(net_ns_type_operations); 1424 1425 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 1426 { 1427 struct net_device *dev = to_net_dev(d); 1428 int retval; 1429 1430 /* pass interface to uevent. */ 1431 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 1432 if (retval) 1433 goto exit; 1434 1435 /* pass ifindex to uevent. 1436 * ifindex is useful as it won't change (interface name may change) 1437 * and is what RtNetlink uses natively. */ 1438 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 1439 1440 exit: 1441 return retval; 1442 } 1443 1444 /* 1445 * netdev_release -- destroy and free a dead device. 1446 * Called when last reference to device kobject is gone. 1447 */ 1448 static void netdev_release(struct device *d) 1449 { 1450 struct net_device *dev = to_net_dev(d); 1451 1452 BUG_ON(dev->reg_state != NETREG_RELEASED); 1453 1454 kfree(dev->ifalias); 1455 netdev_freemem(dev); 1456 } 1457 1458 static const void *net_namespace(struct device *d) 1459 { 1460 struct net_device *dev = to_net_dev(d); 1461 1462 return dev_net(dev); 1463 } 1464 1465 static struct class net_class = { 1466 .name = "net", 1467 .dev_release = netdev_release, 1468 .dev_groups = net_class_groups, 1469 .dev_uevent = netdev_uevent, 1470 .ns_type = &net_ns_type_operations, 1471 .namespace = net_namespace, 1472 }; 1473 1474 #ifdef CONFIG_OF_NET 1475 static int of_dev_node_match(struct device *dev, const void *data) 1476 { 1477 int ret = 0; 1478 1479 if (dev->parent) 1480 ret = dev->parent->of_node == data; 1481 1482 return ret == 0 ? dev->of_node == data : ret; 1483 } 1484 1485 /* 1486 * of_find_net_device_by_node - lookup the net device for the device node 1487 * @np: OF device node 1488 * 1489 * Looks up the net_device structure corresponding with the device node. 1490 * If successful, returns a pointer to the net_device with the embedded 1491 * struct device refcount incremented by one, or NULL on failure. The 1492 * refcount must be dropped when done with the net_device. 1493 */ 1494 struct net_device *of_find_net_device_by_node(struct device_node *np) 1495 { 1496 struct device *dev; 1497 1498 dev = class_find_device(&net_class, NULL, np, of_dev_node_match); 1499 if (!dev) 1500 return NULL; 1501 1502 return to_net_dev(dev); 1503 } 1504 EXPORT_SYMBOL(of_find_net_device_by_node); 1505 #endif 1506 1507 /* Delete sysfs entries but hold kobject reference until after all 1508 * netdev references are gone. 1509 */ 1510 void netdev_unregister_kobject(struct net_device *ndev) 1511 { 1512 struct device *dev = &(ndev->dev); 1513 1514 kobject_get(&dev->kobj); 1515 1516 remove_queue_kobjects(ndev); 1517 1518 pm_runtime_set_memalloc_noio(dev, false); 1519 1520 device_del(dev); 1521 } 1522 1523 /* Create sysfs entries for network device. */ 1524 int netdev_register_kobject(struct net_device *ndev) 1525 { 1526 struct device *dev = &(ndev->dev); 1527 const struct attribute_group **groups = ndev->sysfs_groups; 1528 int error = 0; 1529 1530 device_initialize(dev); 1531 dev->class = &net_class; 1532 dev->platform_data = ndev; 1533 dev->groups = groups; 1534 1535 dev_set_name(dev, "%s", ndev->name); 1536 1537 #ifdef CONFIG_SYSFS 1538 /* Allow for a device specific group */ 1539 if (*groups) 1540 groups++; 1541 1542 *groups++ = &netstat_group; 1543 1544 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 1545 if (ndev->ieee80211_ptr) 1546 *groups++ = &wireless_group; 1547 #if IS_ENABLED(CONFIG_WIRELESS_EXT) 1548 else if (ndev->wireless_handlers) 1549 *groups++ = &wireless_group; 1550 #endif 1551 #endif 1552 #endif /* CONFIG_SYSFS */ 1553 1554 error = device_add(dev); 1555 if (error) 1556 return error; 1557 1558 error = register_queue_kobjects(ndev); 1559 if (error) { 1560 device_del(dev); 1561 return error; 1562 } 1563 1564 pm_runtime_set_memalloc_noio(dev, true); 1565 1566 return error; 1567 } 1568 1569 int netdev_class_create_file_ns(struct class_attribute *class_attr, 1570 const void *ns) 1571 { 1572 return class_create_file_ns(&net_class, class_attr, ns); 1573 } 1574 EXPORT_SYMBOL(netdev_class_create_file_ns); 1575 1576 void netdev_class_remove_file_ns(struct class_attribute *class_attr, 1577 const void *ns) 1578 { 1579 class_remove_file_ns(&net_class, class_attr, ns); 1580 } 1581 EXPORT_SYMBOL(netdev_class_remove_file_ns); 1582 1583 int __init netdev_kobject_init(void) 1584 { 1585 kobj_ns_type_register(&net_ns_type_operations); 1586 return class_register(&net_class); 1587 } 1588