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 switchdev_attr attr = { 462 .id = SWITCHDEV_ATTR_PORT_PARENT_ID, 463 .flags = SWITCHDEV_F_NO_RECURSE, 464 }; 465 466 ret = switchdev_port_attr_get(netdev, &attr); 467 if (!ret) 468 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len, 469 attr.u.ppid.id); 470 } 471 rtnl_unlock(); 472 473 return ret; 474 } 475 static DEVICE_ATTR_RO(phys_switch_id); 476 477 static struct attribute *net_class_attrs[] = { 478 &dev_attr_netdev_group.attr, 479 &dev_attr_type.attr, 480 &dev_attr_dev_id.attr, 481 &dev_attr_dev_port.attr, 482 &dev_attr_iflink.attr, 483 &dev_attr_ifindex.attr, 484 &dev_attr_name_assign_type.attr, 485 &dev_attr_addr_assign_type.attr, 486 &dev_attr_addr_len.attr, 487 &dev_attr_link_mode.attr, 488 &dev_attr_address.attr, 489 &dev_attr_broadcast.attr, 490 &dev_attr_speed.attr, 491 &dev_attr_duplex.attr, 492 &dev_attr_dormant.attr, 493 &dev_attr_operstate.attr, 494 &dev_attr_carrier_changes.attr, 495 &dev_attr_ifalias.attr, 496 &dev_attr_carrier.attr, 497 &dev_attr_mtu.attr, 498 &dev_attr_flags.attr, 499 &dev_attr_tx_queue_len.attr, 500 &dev_attr_gro_flush_timeout.attr, 501 &dev_attr_phys_port_id.attr, 502 &dev_attr_phys_port_name.attr, 503 &dev_attr_phys_switch_id.attr, 504 NULL, 505 }; 506 ATTRIBUTE_GROUPS(net_class); 507 508 /* Show a given an attribute in the statistics group */ 509 static ssize_t netstat_show(const struct device *d, 510 struct device_attribute *attr, char *buf, 511 unsigned long offset) 512 { 513 struct net_device *dev = to_net_dev(d); 514 ssize_t ret = -EINVAL; 515 516 WARN_ON(offset > sizeof(struct rtnl_link_stats64) || 517 offset % sizeof(u64) != 0); 518 519 read_lock(&dev_base_lock); 520 if (dev_isalive(dev)) { 521 struct rtnl_link_stats64 temp; 522 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 523 524 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset)); 525 } 526 read_unlock(&dev_base_lock); 527 return ret; 528 } 529 530 /* generate a read-only statistics attribute */ 531 #define NETSTAT_ENTRY(name) \ 532 static ssize_t name##_show(struct device *d, \ 533 struct device_attribute *attr, char *buf) \ 534 { \ 535 return netstat_show(d, attr, buf, \ 536 offsetof(struct rtnl_link_stats64, name)); \ 537 } \ 538 static DEVICE_ATTR_RO(name) 539 540 NETSTAT_ENTRY(rx_packets); 541 NETSTAT_ENTRY(tx_packets); 542 NETSTAT_ENTRY(rx_bytes); 543 NETSTAT_ENTRY(tx_bytes); 544 NETSTAT_ENTRY(rx_errors); 545 NETSTAT_ENTRY(tx_errors); 546 NETSTAT_ENTRY(rx_dropped); 547 NETSTAT_ENTRY(tx_dropped); 548 NETSTAT_ENTRY(multicast); 549 NETSTAT_ENTRY(collisions); 550 NETSTAT_ENTRY(rx_length_errors); 551 NETSTAT_ENTRY(rx_over_errors); 552 NETSTAT_ENTRY(rx_crc_errors); 553 NETSTAT_ENTRY(rx_frame_errors); 554 NETSTAT_ENTRY(rx_fifo_errors); 555 NETSTAT_ENTRY(rx_missed_errors); 556 NETSTAT_ENTRY(tx_aborted_errors); 557 NETSTAT_ENTRY(tx_carrier_errors); 558 NETSTAT_ENTRY(tx_fifo_errors); 559 NETSTAT_ENTRY(tx_heartbeat_errors); 560 NETSTAT_ENTRY(tx_window_errors); 561 NETSTAT_ENTRY(rx_compressed); 562 NETSTAT_ENTRY(tx_compressed); 563 564 static struct attribute *netstat_attrs[] = { 565 &dev_attr_rx_packets.attr, 566 &dev_attr_tx_packets.attr, 567 &dev_attr_rx_bytes.attr, 568 &dev_attr_tx_bytes.attr, 569 &dev_attr_rx_errors.attr, 570 &dev_attr_tx_errors.attr, 571 &dev_attr_rx_dropped.attr, 572 &dev_attr_tx_dropped.attr, 573 &dev_attr_multicast.attr, 574 &dev_attr_collisions.attr, 575 &dev_attr_rx_length_errors.attr, 576 &dev_attr_rx_over_errors.attr, 577 &dev_attr_rx_crc_errors.attr, 578 &dev_attr_rx_frame_errors.attr, 579 &dev_attr_rx_fifo_errors.attr, 580 &dev_attr_rx_missed_errors.attr, 581 &dev_attr_tx_aborted_errors.attr, 582 &dev_attr_tx_carrier_errors.attr, 583 &dev_attr_tx_fifo_errors.attr, 584 &dev_attr_tx_heartbeat_errors.attr, 585 &dev_attr_tx_window_errors.attr, 586 &dev_attr_rx_compressed.attr, 587 &dev_attr_tx_compressed.attr, 588 NULL 589 }; 590 591 592 static struct attribute_group netstat_group = { 593 .name = "statistics", 594 .attrs = netstat_attrs, 595 }; 596 597 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 598 static struct attribute *wireless_attrs[] = { 599 NULL 600 }; 601 602 static struct attribute_group wireless_group = { 603 .name = "wireless", 604 .attrs = wireless_attrs, 605 }; 606 #endif 607 608 #else /* CONFIG_SYSFS */ 609 #define net_class_groups NULL 610 #endif /* CONFIG_SYSFS */ 611 612 #ifdef CONFIG_SYSFS 613 #define to_rx_queue_attr(_attr) container_of(_attr, \ 614 struct rx_queue_attribute, attr) 615 616 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 617 618 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 619 char *buf) 620 { 621 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 622 struct netdev_rx_queue *queue = to_rx_queue(kobj); 623 624 if (!attribute->show) 625 return -EIO; 626 627 return attribute->show(queue, attribute, buf); 628 } 629 630 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 631 const char *buf, size_t count) 632 { 633 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 634 struct netdev_rx_queue *queue = to_rx_queue(kobj); 635 636 if (!attribute->store) 637 return -EIO; 638 639 return attribute->store(queue, attribute, buf, count); 640 } 641 642 static const struct sysfs_ops rx_queue_sysfs_ops = { 643 .show = rx_queue_attr_show, 644 .store = rx_queue_attr_store, 645 }; 646 647 #ifdef CONFIG_RPS 648 static ssize_t show_rps_map(struct netdev_rx_queue *queue, 649 struct rx_queue_attribute *attribute, char *buf) 650 { 651 struct rps_map *map; 652 cpumask_var_t mask; 653 int i, len; 654 655 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 656 return -ENOMEM; 657 658 rcu_read_lock(); 659 map = rcu_dereference(queue->rps_map); 660 if (map) 661 for (i = 0; i < map->len; i++) 662 cpumask_set_cpu(map->cpus[i], mask); 663 664 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 665 rcu_read_unlock(); 666 free_cpumask_var(mask); 667 668 return len < PAGE_SIZE ? len : -EINVAL; 669 } 670 671 static ssize_t store_rps_map(struct netdev_rx_queue *queue, 672 struct rx_queue_attribute *attribute, 673 const char *buf, size_t len) 674 { 675 struct rps_map *old_map, *map; 676 cpumask_var_t mask; 677 int err, cpu, i; 678 static DEFINE_SPINLOCK(rps_map_lock); 679 680 if (!capable(CAP_NET_ADMIN)) 681 return -EPERM; 682 683 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 684 return -ENOMEM; 685 686 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 687 if (err) { 688 free_cpumask_var(mask); 689 return err; 690 } 691 692 map = kzalloc(max_t(unsigned int, 693 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 694 GFP_KERNEL); 695 if (!map) { 696 free_cpumask_var(mask); 697 return -ENOMEM; 698 } 699 700 i = 0; 701 for_each_cpu_and(cpu, mask, cpu_online_mask) 702 map->cpus[i++] = cpu; 703 704 if (i) 705 map->len = i; 706 else { 707 kfree(map); 708 map = NULL; 709 } 710 711 spin_lock(&rps_map_lock); 712 old_map = rcu_dereference_protected(queue->rps_map, 713 lockdep_is_held(&rps_map_lock)); 714 rcu_assign_pointer(queue->rps_map, map); 715 spin_unlock(&rps_map_lock); 716 717 if (map) 718 static_key_slow_inc(&rps_needed); 719 if (old_map) { 720 kfree_rcu(old_map, rcu); 721 static_key_slow_dec(&rps_needed); 722 } 723 free_cpumask_var(mask); 724 return len; 725 } 726 727 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 728 struct rx_queue_attribute *attr, 729 char *buf) 730 { 731 struct rps_dev_flow_table *flow_table; 732 unsigned long val = 0; 733 734 rcu_read_lock(); 735 flow_table = rcu_dereference(queue->rps_flow_table); 736 if (flow_table) 737 val = (unsigned long)flow_table->mask + 1; 738 rcu_read_unlock(); 739 740 return sprintf(buf, "%lu\n", val); 741 } 742 743 static void rps_dev_flow_table_release(struct rcu_head *rcu) 744 { 745 struct rps_dev_flow_table *table = container_of(rcu, 746 struct rps_dev_flow_table, rcu); 747 vfree(table); 748 } 749 750 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 751 struct rx_queue_attribute *attr, 752 const char *buf, size_t len) 753 { 754 unsigned long mask, count; 755 struct rps_dev_flow_table *table, *old_table; 756 static DEFINE_SPINLOCK(rps_dev_flow_lock); 757 int rc; 758 759 if (!capable(CAP_NET_ADMIN)) 760 return -EPERM; 761 762 rc = kstrtoul(buf, 0, &count); 763 if (rc < 0) 764 return rc; 765 766 if (count) { 767 mask = count - 1; 768 /* mask = roundup_pow_of_two(count) - 1; 769 * without overflows... 770 */ 771 while ((mask | (mask >> 1)) != mask) 772 mask |= (mask >> 1); 773 /* On 64 bit arches, must check mask fits in table->mask (u32), 774 * and on 32bit arches, must check 775 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow. 776 */ 777 #if BITS_PER_LONG > 32 778 if (mask > (unsigned long)(u32)mask) 779 return -EINVAL; 780 #else 781 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) 782 / sizeof(struct rps_dev_flow)) { 783 /* Enforce a limit to prevent overflow */ 784 return -EINVAL; 785 } 786 #endif 787 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); 788 if (!table) 789 return -ENOMEM; 790 791 table->mask = mask; 792 for (count = 0; count <= mask; count++) 793 table->flows[count].cpu = RPS_NO_CPU; 794 } else 795 table = NULL; 796 797 spin_lock(&rps_dev_flow_lock); 798 old_table = rcu_dereference_protected(queue->rps_flow_table, 799 lockdep_is_held(&rps_dev_flow_lock)); 800 rcu_assign_pointer(queue->rps_flow_table, table); 801 spin_unlock(&rps_dev_flow_lock); 802 803 if (old_table) 804 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 805 806 return len; 807 } 808 809 static struct rx_queue_attribute rps_cpus_attribute = 810 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); 811 812 813 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = 814 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, 815 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 816 #endif /* CONFIG_RPS */ 817 818 static struct attribute *rx_queue_default_attrs[] = { 819 #ifdef CONFIG_RPS 820 &rps_cpus_attribute.attr, 821 &rps_dev_flow_table_cnt_attribute.attr, 822 #endif 823 NULL 824 }; 825 826 static void rx_queue_release(struct kobject *kobj) 827 { 828 struct netdev_rx_queue *queue = to_rx_queue(kobj); 829 #ifdef CONFIG_RPS 830 struct rps_map *map; 831 struct rps_dev_flow_table *flow_table; 832 833 834 map = rcu_dereference_protected(queue->rps_map, 1); 835 if (map) { 836 RCU_INIT_POINTER(queue->rps_map, NULL); 837 kfree_rcu(map, rcu); 838 } 839 840 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); 841 if (flow_table) { 842 RCU_INIT_POINTER(queue->rps_flow_table, NULL); 843 call_rcu(&flow_table->rcu, rps_dev_flow_table_release); 844 } 845 #endif 846 847 memset(kobj, 0, sizeof(*kobj)); 848 dev_put(queue->dev); 849 } 850 851 static const void *rx_queue_namespace(struct kobject *kobj) 852 { 853 struct netdev_rx_queue *queue = to_rx_queue(kobj); 854 struct device *dev = &queue->dev->dev; 855 const void *ns = NULL; 856 857 if (dev->class && dev->class->ns_type) 858 ns = dev->class->namespace(dev); 859 860 return ns; 861 } 862 863 static struct kobj_type rx_queue_ktype = { 864 .sysfs_ops = &rx_queue_sysfs_ops, 865 .release = rx_queue_release, 866 .default_attrs = rx_queue_default_attrs, 867 .namespace = rx_queue_namespace 868 }; 869 870 static int rx_queue_add_kobject(struct net_device *dev, int index) 871 { 872 struct netdev_rx_queue *queue = dev->_rx + index; 873 struct kobject *kobj = &queue->kobj; 874 int error = 0; 875 876 kobj->kset = dev->queues_kset; 877 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 878 "rx-%u", index); 879 if (error) 880 goto exit; 881 882 if (dev->sysfs_rx_queue_group) { 883 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); 884 if (error) 885 goto exit; 886 } 887 888 kobject_uevent(kobj, KOBJ_ADD); 889 dev_hold(queue->dev); 890 891 return error; 892 exit: 893 kobject_put(kobj); 894 return error; 895 } 896 #endif /* CONFIG_SYSFS */ 897 898 int 899 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 900 { 901 #ifdef CONFIG_SYSFS 902 int i; 903 int error = 0; 904 905 #ifndef CONFIG_RPS 906 if (!dev->sysfs_rx_queue_group) 907 return 0; 908 #endif 909 for (i = old_num; i < new_num; i++) { 910 error = rx_queue_add_kobject(dev, i); 911 if (error) { 912 new_num = old_num; 913 break; 914 } 915 } 916 917 while (--i >= new_num) { 918 if (dev->sysfs_rx_queue_group) 919 sysfs_remove_group(&dev->_rx[i].kobj, 920 dev->sysfs_rx_queue_group); 921 kobject_put(&dev->_rx[i].kobj); 922 } 923 924 return error; 925 #else 926 return 0; 927 #endif 928 } 929 930 #ifdef CONFIG_SYSFS 931 /* 932 * netdev_queue sysfs structures and functions. 933 */ 934 struct netdev_queue_attribute { 935 struct attribute attr; 936 ssize_t (*show)(struct netdev_queue *queue, 937 struct netdev_queue_attribute *attr, char *buf); 938 ssize_t (*store)(struct netdev_queue *queue, 939 struct netdev_queue_attribute *attr, const char *buf, size_t len); 940 }; 941 #define to_netdev_queue_attr(_attr) container_of(_attr, \ 942 struct netdev_queue_attribute, attr) 943 944 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) 945 946 static ssize_t netdev_queue_attr_show(struct kobject *kobj, 947 struct attribute *attr, char *buf) 948 { 949 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 950 struct netdev_queue *queue = to_netdev_queue(kobj); 951 952 if (!attribute->show) 953 return -EIO; 954 955 return attribute->show(queue, attribute, buf); 956 } 957 958 static ssize_t netdev_queue_attr_store(struct kobject *kobj, 959 struct attribute *attr, 960 const char *buf, size_t count) 961 { 962 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 963 struct netdev_queue *queue = to_netdev_queue(kobj); 964 965 if (!attribute->store) 966 return -EIO; 967 968 return attribute->store(queue, attribute, buf, count); 969 } 970 971 static const struct sysfs_ops netdev_queue_sysfs_ops = { 972 .show = netdev_queue_attr_show, 973 .store = netdev_queue_attr_store, 974 }; 975 976 static ssize_t show_trans_timeout(struct netdev_queue *queue, 977 struct netdev_queue_attribute *attribute, 978 char *buf) 979 { 980 unsigned long trans_timeout; 981 982 spin_lock_irq(&queue->_xmit_lock); 983 trans_timeout = queue->trans_timeout; 984 spin_unlock_irq(&queue->_xmit_lock); 985 986 return sprintf(buf, "%lu", trans_timeout); 987 } 988 989 #ifdef CONFIG_XPS 990 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue) 991 { 992 struct net_device *dev = queue->dev; 993 int i; 994 995 for (i = 0; i < dev->num_tx_queues; i++) 996 if (queue == &dev->_tx[i]) 997 break; 998 999 BUG_ON(i >= dev->num_tx_queues); 1000 1001 return i; 1002 } 1003 1004 static ssize_t show_tx_maxrate(struct netdev_queue *queue, 1005 struct netdev_queue_attribute *attribute, 1006 char *buf) 1007 { 1008 return sprintf(buf, "%lu\n", queue->tx_maxrate); 1009 } 1010 1011 static ssize_t set_tx_maxrate(struct netdev_queue *queue, 1012 struct netdev_queue_attribute *attribute, 1013 const char *buf, size_t len) 1014 { 1015 struct net_device *dev = queue->dev; 1016 int err, index = get_netdev_queue_index(queue); 1017 u32 rate = 0; 1018 1019 err = kstrtou32(buf, 10, &rate); 1020 if (err < 0) 1021 return err; 1022 1023 if (!rtnl_trylock()) 1024 return restart_syscall(); 1025 1026 err = -EOPNOTSUPP; 1027 if (dev->netdev_ops->ndo_set_tx_maxrate) 1028 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate); 1029 1030 rtnl_unlock(); 1031 if (!err) { 1032 queue->tx_maxrate = rate; 1033 return len; 1034 } 1035 return err; 1036 } 1037 1038 static struct netdev_queue_attribute queue_tx_maxrate = 1039 __ATTR(tx_maxrate, S_IRUGO | S_IWUSR, 1040 show_tx_maxrate, set_tx_maxrate); 1041 #endif 1042 1043 static struct netdev_queue_attribute queue_trans_timeout = 1044 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL); 1045 1046 #ifdef CONFIG_BQL 1047 /* 1048 * Byte queue limits sysfs structures and functions. 1049 */ 1050 static ssize_t bql_show(char *buf, unsigned int value) 1051 { 1052 return sprintf(buf, "%u\n", value); 1053 } 1054 1055 static ssize_t bql_set(const char *buf, const size_t count, 1056 unsigned int *pvalue) 1057 { 1058 unsigned int value; 1059 int err; 1060 1061 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) 1062 value = DQL_MAX_LIMIT; 1063 else { 1064 err = kstrtouint(buf, 10, &value); 1065 if (err < 0) 1066 return err; 1067 if (value > DQL_MAX_LIMIT) 1068 return -EINVAL; 1069 } 1070 1071 *pvalue = value; 1072 1073 return count; 1074 } 1075 1076 static ssize_t bql_show_hold_time(struct netdev_queue *queue, 1077 struct netdev_queue_attribute *attr, 1078 char *buf) 1079 { 1080 struct dql *dql = &queue->dql; 1081 1082 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); 1083 } 1084 1085 static ssize_t bql_set_hold_time(struct netdev_queue *queue, 1086 struct netdev_queue_attribute *attribute, 1087 const char *buf, size_t len) 1088 { 1089 struct dql *dql = &queue->dql; 1090 unsigned int value; 1091 int err; 1092 1093 err = kstrtouint(buf, 10, &value); 1094 if (err < 0) 1095 return err; 1096 1097 dql->slack_hold_time = msecs_to_jiffies(value); 1098 1099 return len; 1100 } 1101 1102 static struct netdev_queue_attribute bql_hold_time_attribute = 1103 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time, 1104 bql_set_hold_time); 1105 1106 static ssize_t bql_show_inflight(struct netdev_queue *queue, 1107 struct netdev_queue_attribute *attr, 1108 char *buf) 1109 { 1110 struct dql *dql = &queue->dql; 1111 1112 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); 1113 } 1114 1115 static struct netdev_queue_attribute bql_inflight_attribute = 1116 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL); 1117 1118 #define BQL_ATTR(NAME, FIELD) \ 1119 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ 1120 struct netdev_queue_attribute *attr, \ 1121 char *buf) \ 1122 { \ 1123 return bql_show(buf, queue->dql.FIELD); \ 1124 } \ 1125 \ 1126 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ 1127 struct netdev_queue_attribute *attr, \ 1128 const char *buf, size_t len) \ 1129 { \ 1130 return bql_set(buf, len, &queue->dql.FIELD); \ 1131 } \ 1132 \ 1133 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \ 1134 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \ 1135 bql_set_ ## NAME); 1136 1137 BQL_ATTR(limit, limit) 1138 BQL_ATTR(limit_max, max_limit) 1139 BQL_ATTR(limit_min, min_limit) 1140 1141 static struct attribute *dql_attrs[] = { 1142 &bql_limit_attribute.attr, 1143 &bql_limit_max_attribute.attr, 1144 &bql_limit_min_attribute.attr, 1145 &bql_hold_time_attribute.attr, 1146 &bql_inflight_attribute.attr, 1147 NULL 1148 }; 1149 1150 static struct attribute_group dql_group = { 1151 .name = "byte_queue_limits", 1152 .attrs = dql_attrs, 1153 }; 1154 #endif /* CONFIG_BQL */ 1155 1156 #ifdef CONFIG_XPS 1157 static ssize_t show_xps_map(struct netdev_queue *queue, 1158 struct netdev_queue_attribute *attribute, char *buf) 1159 { 1160 struct net_device *dev = queue->dev; 1161 struct xps_dev_maps *dev_maps; 1162 cpumask_var_t mask; 1163 unsigned long index; 1164 int i, len; 1165 1166 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 1167 return -ENOMEM; 1168 1169 index = get_netdev_queue_index(queue); 1170 1171 rcu_read_lock(); 1172 dev_maps = rcu_dereference(dev->xps_maps); 1173 if (dev_maps) { 1174 for_each_possible_cpu(i) { 1175 struct xps_map *map = 1176 rcu_dereference(dev_maps->cpu_map[i]); 1177 if (map) { 1178 int j; 1179 for (j = 0; j < map->len; j++) { 1180 if (map->queues[j] == index) { 1181 cpumask_set_cpu(i, mask); 1182 break; 1183 } 1184 } 1185 } 1186 } 1187 } 1188 rcu_read_unlock(); 1189 1190 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 1191 free_cpumask_var(mask); 1192 return len < PAGE_SIZE ? len : -EINVAL; 1193 } 1194 1195 static ssize_t store_xps_map(struct netdev_queue *queue, 1196 struct netdev_queue_attribute *attribute, 1197 const char *buf, size_t len) 1198 { 1199 struct net_device *dev = queue->dev; 1200 unsigned long index; 1201 cpumask_var_t mask; 1202 int err; 1203 1204 if (!capable(CAP_NET_ADMIN)) 1205 return -EPERM; 1206 1207 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 1208 return -ENOMEM; 1209 1210 index = get_netdev_queue_index(queue); 1211 1212 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 1213 if (err) { 1214 free_cpumask_var(mask); 1215 return err; 1216 } 1217 1218 err = netif_set_xps_queue(dev, mask, index); 1219 1220 free_cpumask_var(mask); 1221 1222 return err ? : len; 1223 } 1224 1225 static struct netdev_queue_attribute xps_cpus_attribute = 1226 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map); 1227 #endif /* CONFIG_XPS */ 1228 1229 static struct attribute *netdev_queue_default_attrs[] = { 1230 &queue_trans_timeout.attr, 1231 #ifdef CONFIG_XPS 1232 &xps_cpus_attribute.attr, 1233 &queue_tx_maxrate.attr, 1234 #endif 1235 NULL 1236 }; 1237 1238 static void netdev_queue_release(struct kobject *kobj) 1239 { 1240 struct netdev_queue *queue = to_netdev_queue(kobj); 1241 1242 memset(kobj, 0, sizeof(*kobj)); 1243 dev_put(queue->dev); 1244 } 1245 1246 static const void *netdev_queue_namespace(struct kobject *kobj) 1247 { 1248 struct netdev_queue *queue = to_netdev_queue(kobj); 1249 struct device *dev = &queue->dev->dev; 1250 const void *ns = NULL; 1251 1252 if (dev->class && dev->class->ns_type) 1253 ns = dev->class->namespace(dev); 1254 1255 return ns; 1256 } 1257 1258 static struct kobj_type netdev_queue_ktype = { 1259 .sysfs_ops = &netdev_queue_sysfs_ops, 1260 .release = netdev_queue_release, 1261 .default_attrs = netdev_queue_default_attrs, 1262 .namespace = netdev_queue_namespace, 1263 }; 1264 1265 static int netdev_queue_add_kobject(struct net_device *dev, int index) 1266 { 1267 struct netdev_queue *queue = dev->_tx + index; 1268 struct kobject *kobj = &queue->kobj; 1269 int error = 0; 1270 1271 kobj->kset = dev->queues_kset; 1272 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, 1273 "tx-%u", index); 1274 if (error) 1275 goto exit; 1276 1277 #ifdef CONFIG_BQL 1278 error = sysfs_create_group(kobj, &dql_group); 1279 if (error) 1280 goto exit; 1281 #endif 1282 1283 kobject_uevent(kobj, KOBJ_ADD); 1284 dev_hold(queue->dev); 1285 1286 return 0; 1287 exit: 1288 kobject_put(kobj); 1289 return error; 1290 } 1291 #endif /* CONFIG_SYSFS */ 1292 1293 int 1294 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 1295 { 1296 #ifdef CONFIG_SYSFS 1297 int i; 1298 int error = 0; 1299 1300 for (i = old_num; i < new_num; i++) { 1301 error = netdev_queue_add_kobject(dev, i); 1302 if (error) { 1303 new_num = old_num; 1304 break; 1305 } 1306 } 1307 1308 while (--i >= new_num) { 1309 struct netdev_queue *queue = dev->_tx + i; 1310 1311 #ifdef CONFIG_BQL 1312 sysfs_remove_group(&queue->kobj, &dql_group); 1313 #endif 1314 kobject_put(&queue->kobj); 1315 } 1316 1317 return error; 1318 #else 1319 return 0; 1320 #endif /* CONFIG_SYSFS */ 1321 } 1322 1323 static int register_queue_kobjects(struct net_device *dev) 1324 { 1325 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; 1326 1327 #ifdef CONFIG_SYSFS 1328 dev->queues_kset = kset_create_and_add("queues", 1329 NULL, &dev->dev.kobj); 1330 if (!dev->queues_kset) 1331 return -ENOMEM; 1332 real_rx = dev->real_num_rx_queues; 1333 #endif 1334 real_tx = dev->real_num_tx_queues; 1335 1336 error = net_rx_queue_update_kobjects(dev, 0, real_rx); 1337 if (error) 1338 goto error; 1339 rxq = real_rx; 1340 1341 error = netdev_queue_update_kobjects(dev, 0, real_tx); 1342 if (error) 1343 goto error; 1344 txq = real_tx; 1345 1346 return 0; 1347 1348 error: 1349 netdev_queue_update_kobjects(dev, txq, 0); 1350 net_rx_queue_update_kobjects(dev, rxq, 0); 1351 return error; 1352 } 1353 1354 static void remove_queue_kobjects(struct net_device *dev) 1355 { 1356 int real_rx = 0, real_tx = 0; 1357 1358 #ifdef CONFIG_SYSFS 1359 real_rx = dev->real_num_rx_queues; 1360 #endif 1361 real_tx = dev->real_num_tx_queues; 1362 1363 net_rx_queue_update_kobjects(dev, real_rx, 0); 1364 netdev_queue_update_kobjects(dev, real_tx, 0); 1365 #ifdef CONFIG_SYSFS 1366 kset_unregister(dev->queues_kset); 1367 #endif 1368 } 1369 1370 static bool net_current_may_mount(void) 1371 { 1372 struct net *net = current->nsproxy->net_ns; 1373 1374 return ns_capable(net->user_ns, CAP_SYS_ADMIN); 1375 } 1376 1377 static void *net_grab_current_ns(void) 1378 { 1379 struct net *ns = current->nsproxy->net_ns; 1380 #ifdef CONFIG_NET_NS 1381 if (ns) 1382 atomic_inc(&ns->passive); 1383 #endif 1384 return ns; 1385 } 1386 1387 static const void *net_initial_ns(void) 1388 { 1389 return &init_net; 1390 } 1391 1392 static const void *net_netlink_ns(struct sock *sk) 1393 { 1394 return sock_net(sk); 1395 } 1396 1397 struct kobj_ns_type_operations net_ns_type_operations = { 1398 .type = KOBJ_NS_TYPE_NET, 1399 .current_may_mount = net_current_may_mount, 1400 .grab_current_ns = net_grab_current_ns, 1401 .netlink_ns = net_netlink_ns, 1402 .initial_ns = net_initial_ns, 1403 .drop_ns = net_drop_ns, 1404 }; 1405 EXPORT_SYMBOL_GPL(net_ns_type_operations); 1406 1407 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 1408 { 1409 struct net_device *dev = to_net_dev(d); 1410 int retval; 1411 1412 /* pass interface to uevent. */ 1413 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 1414 if (retval) 1415 goto exit; 1416 1417 /* pass ifindex to uevent. 1418 * ifindex is useful as it won't change (interface name may change) 1419 * and is what RtNetlink uses natively. */ 1420 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 1421 1422 exit: 1423 return retval; 1424 } 1425 1426 /* 1427 * netdev_release -- destroy and free a dead device. 1428 * Called when last reference to device kobject is gone. 1429 */ 1430 static void netdev_release(struct device *d) 1431 { 1432 struct net_device *dev = to_net_dev(d); 1433 1434 BUG_ON(dev->reg_state != NETREG_RELEASED); 1435 1436 kfree(dev->ifalias); 1437 netdev_freemem(dev); 1438 } 1439 1440 static const void *net_namespace(struct device *d) 1441 { 1442 struct net_device *dev; 1443 dev = container_of(d, struct net_device, dev); 1444 return dev_net(dev); 1445 } 1446 1447 static struct class net_class = { 1448 .name = "net", 1449 .dev_release = netdev_release, 1450 .dev_groups = net_class_groups, 1451 .dev_uevent = netdev_uevent, 1452 .ns_type = &net_ns_type_operations, 1453 .namespace = net_namespace, 1454 }; 1455 1456 #ifdef CONFIG_OF_NET 1457 static int of_dev_node_match(struct device *dev, const void *data) 1458 { 1459 int ret = 0; 1460 1461 if (dev->parent) 1462 ret = dev->parent->of_node == data; 1463 1464 return ret == 0 ? dev->of_node == data : ret; 1465 } 1466 1467 struct net_device *of_find_net_device_by_node(struct device_node *np) 1468 { 1469 struct device *dev; 1470 1471 dev = class_find_device(&net_class, NULL, np, of_dev_node_match); 1472 if (!dev) 1473 return NULL; 1474 1475 return to_net_dev(dev); 1476 } 1477 EXPORT_SYMBOL(of_find_net_device_by_node); 1478 #endif 1479 1480 /* Delete sysfs entries but hold kobject reference until after all 1481 * netdev references are gone. 1482 */ 1483 void netdev_unregister_kobject(struct net_device *ndev) 1484 { 1485 struct device *dev = &(ndev->dev); 1486 1487 kobject_get(&dev->kobj); 1488 1489 remove_queue_kobjects(ndev); 1490 1491 pm_runtime_set_memalloc_noio(dev, false); 1492 1493 device_del(dev); 1494 } 1495 1496 /* Create sysfs entries for network device. */ 1497 int netdev_register_kobject(struct net_device *ndev) 1498 { 1499 struct device *dev = &(ndev->dev); 1500 const struct attribute_group **groups = ndev->sysfs_groups; 1501 int error = 0; 1502 1503 device_initialize(dev); 1504 dev->class = &net_class; 1505 dev->platform_data = ndev; 1506 dev->groups = groups; 1507 1508 dev_set_name(dev, "%s", ndev->name); 1509 1510 #ifdef CONFIG_SYSFS 1511 /* Allow for a device specific group */ 1512 if (*groups) 1513 groups++; 1514 1515 *groups++ = &netstat_group; 1516 1517 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 1518 if (ndev->ieee80211_ptr) 1519 *groups++ = &wireless_group; 1520 #if IS_ENABLED(CONFIG_WIRELESS_EXT) 1521 else if (ndev->wireless_handlers) 1522 *groups++ = &wireless_group; 1523 #endif 1524 #endif 1525 #endif /* CONFIG_SYSFS */ 1526 1527 error = device_add(dev); 1528 if (error) 1529 return error; 1530 1531 error = register_queue_kobjects(ndev); 1532 if (error) { 1533 device_del(dev); 1534 return error; 1535 } 1536 1537 pm_runtime_set_memalloc_noio(dev, true); 1538 1539 return error; 1540 } 1541 1542 int netdev_class_create_file_ns(struct class_attribute *class_attr, 1543 const void *ns) 1544 { 1545 return class_create_file_ns(&net_class, class_attr, ns); 1546 } 1547 EXPORT_SYMBOL(netdev_class_create_file_ns); 1548 1549 void netdev_class_remove_file_ns(struct class_attribute *class_attr, 1550 const void *ns) 1551 { 1552 class_remove_file_ns(&net_class, class_attr, ns); 1553 } 1554 EXPORT_SYMBOL(netdev_class_remove_file_ns); 1555 1556 int __init netdev_kobject_init(void) 1557 { 1558 kobj_ns_type_register(&net_ns_type_operations); 1559 return class_register(&net_class); 1560 } 1561