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 #include <linux/of_net.h> 28 29 #include "net-sysfs.h" 30 31 #ifdef CONFIG_SYSFS 32 static const char fmt_hex[] = "%#x\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_link_ksettings cmd; 203 204 if (!__ethtool_get_link_ksettings(netdev, &cmd)) 205 ret = sprintf(buf, fmt_dec, cmd.base.speed); 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_link_ksettings cmd; 223 224 if (!__ethtool_get_link_ksettings(netdev, &cmd)) { 225 const char *duplex; 226 227 switch (cmd.base.duplex) { 228 case DUPLEX_HALF: 229 duplex = "half"; 230 break; 231 case DUPLEX_FULL: 232 duplex = "full"; 233 break; 234 default: 235 duplex = "unknown"; 236 break; 237 } 238 ret = sprintf(buf, "%s\n", duplex); 239 } 240 } 241 rtnl_unlock(); 242 return ret; 243 } 244 static DEVICE_ATTR_RO(duplex); 245 246 static ssize_t dormant_show(struct device *dev, 247 struct device_attribute *attr, char *buf) 248 { 249 struct net_device *netdev = to_net_dev(dev); 250 251 if (netif_running(netdev)) 252 return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); 253 254 return -EINVAL; 255 } 256 static DEVICE_ATTR_RO(dormant); 257 258 static const char *const operstates[] = { 259 "unknown", 260 "notpresent", /* currently unused */ 261 "down", 262 "lowerlayerdown", 263 "testing", /* currently unused */ 264 "dormant", 265 "up" 266 }; 267 268 static ssize_t operstate_show(struct device *dev, 269 struct device_attribute *attr, char *buf) 270 { 271 const struct net_device *netdev = to_net_dev(dev); 272 unsigned char operstate; 273 274 read_lock(&dev_base_lock); 275 operstate = netdev->operstate; 276 if (!netif_running(netdev)) 277 operstate = IF_OPER_DOWN; 278 read_unlock(&dev_base_lock); 279 280 if (operstate >= ARRAY_SIZE(operstates)) 281 return -EINVAL; /* should not happen */ 282 283 return sprintf(buf, "%s\n", operstates[operstate]); 284 } 285 static DEVICE_ATTR_RO(operstate); 286 287 static ssize_t carrier_changes_show(struct device *dev, 288 struct device_attribute *attr, 289 char *buf) 290 { 291 struct net_device *netdev = to_net_dev(dev); 292 return sprintf(buf, fmt_dec, 293 atomic_read(&netdev->carrier_changes)); 294 } 295 static DEVICE_ATTR_RO(carrier_changes); 296 297 /* read-write attributes */ 298 299 static int change_mtu(struct net_device *dev, unsigned long new_mtu) 300 { 301 return dev_set_mtu(dev, (int) new_mtu); 302 } 303 304 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr, 305 const char *buf, size_t len) 306 { 307 return netdev_store(dev, attr, buf, len, change_mtu); 308 } 309 NETDEVICE_SHOW_RW(mtu, fmt_dec); 310 311 static int change_flags(struct net_device *dev, unsigned long new_flags) 312 { 313 return dev_change_flags(dev, (unsigned int) new_flags); 314 } 315 316 static ssize_t flags_store(struct device *dev, struct device_attribute *attr, 317 const char *buf, size_t len) 318 { 319 return netdev_store(dev, attr, buf, len, change_flags); 320 } 321 NETDEVICE_SHOW_RW(flags, fmt_hex); 322 323 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len) 324 { 325 dev->tx_queue_len = new_len; 326 return 0; 327 } 328 329 static ssize_t tx_queue_len_store(struct device *dev, 330 struct device_attribute *attr, 331 const char *buf, size_t len) 332 { 333 if (!capable(CAP_NET_ADMIN)) 334 return -EPERM; 335 336 return netdev_store(dev, attr, buf, len, change_tx_queue_len); 337 } 338 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong); 339 340 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val) 341 { 342 dev->gro_flush_timeout = val; 343 return 0; 344 } 345 346 static ssize_t gro_flush_timeout_store(struct device *dev, 347 struct device_attribute *attr, 348 const char *buf, size_t len) 349 { 350 if (!capable(CAP_NET_ADMIN)) 351 return -EPERM; 352 353 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout); 354 } 355 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong); 356 357 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr, 358 const char *buf, size_t len) 359 { 360 struct net_device *netdev = to_net_dev(dev); 361 struct net *net = dev_net(netdev); 362 size_t count = len; 363 ssize_t ret; 364 365 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 366 return -EPERM; 367 368 /* ignore trailing newline */ 369 if (len > 0 && buf[len - 1] == '\n') 370 --count; 371 372 if (!rtnl_trylock()) 373 return restart_syscall(); 374 ret = dev_set_alias(netdev, buf, count); 375 rtnl_unlock(); 376 377 return ret < 0 ? ret : len; 378 } 379 380 static ssize_t ifalias_show(struct device *dev, 381 struct device_attribute *attr, char *buf) 382 { 383 const struct net_device *netdev = to_net_dev(dev); 384 ssize_t ret = 0; 385 386 if (!rtnl_trylock()) 387 return restart_syscall(); 388 if (netdev->ifalias) 389 ret = sprintf(buf, "%s\n", netdev->ifalias); 390 rtnl_unlock(); 391 return ret; 392 } 393 static DEVICE_ATTR_RW(ifalias); 394 395 static int change_group(struct net_device *dev, unsigned long new_group) 396 { 397 dev_set_group(dev, (int) new_group); 398 return 0; 399 } 400 401 static ssize_t group_store(struct device *dev, struct device_attribute *attr, 402 const char *buf, size_t len) 403 { 404 return netdev_store(dev, attr, buf, len, change_group); 405 } 406 NETDEVICE_SHOW(group, fmt_dec); 407 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store); 408 409 static int change_proto_down(struct net_device *dev, unsigned long proto_down) 410 { 411 return dev_change_proto_down(dev, (bool) proto_down); 412 } 413 414 static ssize_t proto_down_store(struct device *dev, 415 struct device_attribute *attr, 416 const char *buf, size_t len) 417 { 418 return netdev_store(dev, attr, buf, len, change_proto_down); 419 } 420 NETDEVICE_SHOW_RW(proto_down, fmt_dec); 421 422 static ssize_t phys_port_id_show(struct device *dev, 423 struct device_attribute *attr, char *buf) 424 { 425 struct net_device *netdev = to_net_dev(dev); 426 ssize_t ret = -EINVAL; 427 428 if (!rtnl_trylock()) 429 return restart_syscall(); 430 431 if (dev_isalive(netdev)) { 432 struct netdev_phys_item_id ppid; 433 434 ret = dev_get_phys_port_id(netdev, &ppid); 435 if (!ret) 436 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); 437 } 438 rtnl_unlock(); 439 440 return ret; 441 } 442 static DEVICE_ATTR_RO(phys_port_id); 443 444 static ssize_t phys_port_name_show(struct device *dev, 445 struct device_attribute *attr, char *buf) 446 { 447 struct net_device *netdev = to_net_dev(dev); 448 ssize_t ret = -EINVAL; 449 450 if (!rtnl_trylock()) 451 return restart_syscall(); 452 453 if (dev_isalive(netdev)) { 454 char name[IFNAMSIZ]; 455 456 ret = dev_get_phys_port_name(netdev, name, sizeof(name)); 457 if (!ret) 458 ret = sprintf(buf, "%s\n", name); 459 } 460 rtnl_unlock(); 461 462 return ret; 463 } 464 static DEVICE_ATTR_RO(phys_port_name); 465 466 static ssize_t phys_switch_id_show(struct device *dev, 467 struct device_attribute *attr, char *buf) 468 { 469 struct net_device *netdev = to_net_dev(dev); 470 ssize_t ret = -EINVAL; 471 472 if (!rtnl_trylock()) 473 return restart_syscall(); 474 475 if (dev_isalive(netdev)) { 476 struct switchdev_attr attr = { 477 .orig_dev = netdev, 478 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 479 .flags = SWITCHDEV_F_NO_RECURSE, 480 }; 481 482 ret = switchdev_port_attr_get(netdev, &attr); 483 if (!ret) 484 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len, 485 attr.u.ppid.id); 486 } 487 rtnl_unlock(); 488 489 return ret; 490 } 491 static DEVICE_ATTR_RO(phys_switch_id); 492 493 static struct attribute *net_class_attrs[] = { 494 &dev_attr_netdev_group.attr, 495 &dev_attr_type.attr, 496 &dev_attr_dev_id.attr, 497 &dev_attr_dev_port.attr, 498 &dev_attr_iflink.attr, 499 &dev_attr_ifindex.attr, 500 &dev_attr_name_assign_type.attr, 501 &dev_attr_addr_assign_type.attr, 502 &dev_attr_addr_len.attr, 503 &dev_attr_link_mode.attr, 504 &dev_attr_address.attr, 505 &dev_attr_broadcast.attr, 506 &dev_attr_speed.attr, 507 &dev_attr_duplex.attr, 508 &dev_attr_dormant.attr, 509 &dev_attr_operstate.attr, 510 &dev_attr_carrier_changes.attr, 511 &dev_attr_ifalias.attr, 512 &dev_attr_carrier.attr, 513 &dev_attr_mtu.attr, 514 &dev_attr_flags.attr, 515 &dev_attr_tx_queue_len.attr, 516 &dev_attr_gro_flush_timeout.attr, 517 &dev_attr_phys_port_id.attr, 518 &dev_attr_phys_port_name.attr, 519 &dev_attr_phys_switch_id.attr, 520 &dev_attr_proto_down.attr, 521 NULL, 522 }; 523 ATTRIBUTE_GROUPS(net_class); 524 525 /* Show a given an attribute in the statistics group */ 526 static ssize_t netstat_show(const struct device *d, 527 struct device_attribute *attr, char *buf, 528 unsigned long offset) 529 { 530 struct net_device *dev = to_net_dev(d); 531 ssize_t ret = -EINVAL; 532 533 WARN_ON(offset > sizeof(struct rtnl_link_stats64) || 534 offset % sizeof(u64) != 0); 535 536 read_lock(&dev_base_lock); 537 if (dev_isalive(dev)) { 538 struct rtnl_link_stats64 temp; 539 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 540 541 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset)); 542 } 543 read_unlock(&dev_base_lock); 544 return ret; 545 } 546 547 /* generate a read-only statistics attribute */ 548 #define NETSTAT_ENTRY(name) \ 549 static ssize_t name##_show(struct device *d, \ 550 struct device_attribute *attr, char *buf) \ 551 { \ 552 return netstat_show(d, attr, buf, \ 553 offsetof(struct rtnl_link_stats64, name)); \ 554 } \ 555 static DEVICE_ATTR_RO(name) 556 557 NETSTAT_ENTRY(rx_packets); 558 NETSTAT_ENTRY(tx_packets); 559 NETSTAT_ENTRY(rx_bytes); 560 NETSTAT_ENTRY(tx_bytes); 561 NETSTAT_ENTRY(rx_errors); 562 NETSTAT_ENTRY(tx_errors); 563 NETSTAT_ENTRY(rx_dropped); 564 NETSTAT_ENTRY(tx_dropped); 565 NETSTAT_ENTRY(multicast); 566 NETSTAT_ENTRY(collisions); 567 NETSTAT_ENTRY(rx_length_errors); 568 NETSTAT_ENTRY(rx_over_errors); 569 NETSTAT_ENTRY(rx_crc_errors); 570 NETSTAT_ENTRY(rx_frame_errors); 571 NETSTAT_ENTRY(rx_fifo_errors); 572 NETSTAT_ENTRY(rx_missed_errors); 573 NETSTAT_ENTRY(tx_aborted_errors); 574 NETSTAT_ENTRY(tx_carrier_errors); 575 NETSTAT_ENTRY(tx_fifo_errors); 576 NETSTAT_ENTRY(tx_heartbeat_errors); 577 NETSTAT_ENTRY(tx_window_errors); 578 NETSTAT_ENTRY(rx_compressed); 579 NETSTAT_ENTRY(tx_compressed); 580 NETSTAT_ENTRY(rx_nohandler); 581 582 static struct attribute *netstat_attrs[] = { 583 &dev_attr_rx_packets.attr, 584 &dev_attr_tx_packets.attr, 585 &dev_attr_rx_bytes.attr, 586 &dev_attr_tx_bytes.attr, 587 &dev_attr_rx_errors.attr, 588 &dev_attr_tx_errors.attr, 589 &dev_attr_rx_dropped.attr, 590 &dev_attr_tx_dropped.attr, 591 &dev_attr_multicast.attr, 592 &dev_attr_collisions.attr, 593 &dev_attr_rx_length_errors.attr, 594 &dev_attr_rx_over_errors.attr, 595 &dev_attr_rx_crc_errors.attr, 596 &dev_attr_rx_frame_errors.attr, 597 &dev_attr_rx_fifo_errors.attr, 598 &dev_attr_rx_missed_errors.attr, 599 &dev_attr_tx_aborted_errors.attr, 600 &dev_attr_tx_carrier_errors.attr, 601 &dev_attr_tx_fifo_errors.attr, 602 &dev_attr_tx_heartbeat_errors.attr, 603 &dev_attr_tx_window_errors.attr, 604 &dev_attr_rx_compressed.attr, 605 &dev_attr_tx_compressed.attr, 606 &dev_attr_rx_nohandler.attr, 607 NULL 608 }; 609 610 611 static struct attribute_group netstat_group = { 612 .name = "statistics", 613 .attrs = netstat_attrs, 614 }; 615 616 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 617 static struct attribute *wireless_attrs[] = { 618 NULL 619 }; 620 621 static struct attribute_group wireless_group = { 622 .name = "wireless", 623 .attrs = wireless_attrs, 624 }; 625 #endif 626 627 #else /* CONFIG_SYSFS */ 628 #define net_class_groups NULL 629 #endif /* CONFIG_SYSFS */ 630 631 #ifdef CONFIG_SYSFS 632 #define to_rx_queue_attr(_attr) container_of(_attr, \ 633 struct rx_queue_attribute, attr) 634 635 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 636 637 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 638 char *buf) 639 { 640 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 641 struct netdev_rx_queue *queue = to_rx_queue(kobj); 642 643 if (!attribute->show) 644 return -EIO; 645 646 return attribute->show(queue, attribute, buf); 647 } 648 649 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 650 const char *buf, size_t count) 651 { 652 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 653 struct netdev_rx_queue *queue = to_rx_queue(kobj); 654 655 if (!attribute->store) 656 return -EIO; 657 658 return attribute->store(queue, attribute, buf, count); 659 } 660 661 static const struct sysfs_ops rx_queue_sysfs_ops = { 662 .show = rx_queue_attr_show, 663 .store = rx_queue_attr_store, 664 }; 665 666 #ifdef CONFIG_RPS 667 static ssize_t show_rps_map(struct netdev_rx_queue *queue, 668 struct rx_queue_attribute *attribute, char *buf) 669 { 670 struct rps_map *map; 671 cpumask_var_t mask; 672 int i, len; 673 674 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 675 return -ENOMEM; 676 677 rcu_read_lock(); 678 map = rcu_dereference(queue->rps_map); 679 if (map) 680 for (i = 0; i < map->len; i++) 681 cpumask_set_cpu(map->cpus[i], mask); 682 683 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 684 rcu_read_unlock(); 685 free_cpumask_var(mask); 686 687 return len < PAGE_SIZE ? len : -EINVAL; 688 } 689 690 static ssize_t store_rps_map(struct netdev_rx_queue *queue, 691 struct rx_queue_attribute *attribute, 692 const char *buf, size_t len) 693 { 694 struct rps_map *old_map, *map; 695 cpumask_var_t mask; 696 int err, cpu, i; 697 static DEFINE_MUTEX(rps_map_mutex); 698 699 if (!capable(CAP_NET_ADMIN)) 700 return -EPERM; 701 702 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 703 return -ENOMEM; 704 705 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 706 if (err) { 707 free_cpumask_var(mask); 708 return err; 709 } 710 711 map = kzalloc(max_t(unsigned int, 712 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 713 GFP_KERNEL); 714 if (!map) { 715 free_cpumask_var(mask); 716 return -ENOMEM; 717 } 718 719 i = 0; 720 for_each_cpu_and(cpu, mask, cpu_online_mask) 721 map->cpus[i++] = cpu; 722 723 if (i) 724 map->len = i; 725 else { 726 kfree(map); 727 map = NULL; 728 } 729 730 mutex_lock(&rps_map_mutex); 731 old_map = rcu_dereference_protected(queue->rps_map, 732 mutex_is_locked(&rps_map_mutex)); 733 rcu_assign_pointer(queue->rps_map, map); 734 735 if (map) 736 static_key_slow_inc(&rps_needed); 737 if (old_map) 738 static_key_slow_dec(&rps_needed); 739 740 mutex_unlock(&rps_map_mutex); 741 742 if (old_map) 743 kfree_rcu(old_map, rcu); 744 745 free_cpumask_var(mask); 746 return len; 747 } 748 749 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 750 struct rx_queue_attribute *attr, 751 char *buf) 752 { 753 struct rps_dev_flow_table *flow_table; 754 unsigned long val = 0; 755 756 rcu_read_lock(); 757 flow_table = rcu_dereference(queue->rps_flow_table); 758 if (flow_table) 759 val = (unsigned long)flow_table->mask + 1; 760 rcu_read_unlock(); 761 762 return sprintf(buf, "%lu\n", val); 763 } 764 765 static void rps_dev_flow_table_release(struct rcu_head *rcu) 766 { 767 struct rps_dev_flow_table *table = container_of(rcu, 768 struct rps_dev_flow_table, rcu); 769 vfree(table); 770 } 771 772 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 773 struct rx_queue_attribute *attr, 774 const char *buf, size_t len) 775 { 776 unsigned long mask, count; 777 struct rps_dev_flow_table *table, *old_table; 778 static DEFINE_SPINLOCK(rps_dev_flow_lock); 779 int rc; 780 781 if (!capable(CAP_NET_ADMIN)) 782 return -EPERM; 783 784 rc = kstrtoul(buf, 0, &count); 785 if (rc < 0) 786 return rc; 787 788 if (count) { 789 mask = count - 1; 790 /* mask = roundup_pow_of_two(count) - 1; 791 * without overflows... 792 */ 793 while ((mask | (mask >> 1)) != mask) 794 mask |= (mask >> 1); 795 /* On 64 bit arches, must check mask fits in table->mask (u32), 796 * and on 32bit arches, must check 797 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow. 798 */ 799 #if BITS_PER_LONG > 32 800 if (mask > (unsigned long)(u32)mask) 801 return -EINVAL; 802 #else 803 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) 804 / sizeof(struct rps_dev_flow)) { 805 /* Enforce a limit to prevent overflow */ 806 return -EINVAL; 807 } 808 #endif 809 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); 810 if (!table) 811 return -ENOMEM; 812 813 table->mask = mask; 814 for (count = 0; count <= mask; count++) 815 table->flows[count].cpu = RPS_NO_CPU; 816 } else 817 table = NULL; 818 819 spin_lock(&rps_dev_flow_lock); 820 old_table = rcu_dereference_protected(queue->rps_flow_table, 821 lockdep_is_held(&rps_dev_flow_lock)); 822 rcu_assign_pointer(queue->rps_flow_table, table); 823 spin_unlock(&rps_dev_flow_lock); 824 825 if (old_table) 826 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 827 828 return len; 829 } 830 831 static struct rx_queue_attribute rps_cpus_attribute = 832 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); 833 834 835 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = 836 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, 837 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 838 #endif /* CONFIG_RPS */ 839 840 static struct attribute *rx_queue_default_attrs[] = { 841 #ifdef CONFIG_RPS 842 &rps_cpus_attribute.attr, 843 &rps_dev_flow_table_cnt_attribute.attr, 844 #endif 845 NULL 846 }; 847 848 static void rx_queue_release(struct kobject *kobj) 849 { 850 struct netdev_rx_queue *queue = to_rx_queue(kobj); 851 #ifdef CONFIG_RPS 852 struct rps_map *map; 853 struct rps_dev_flow_table *flow_table; 854 855 856 map = rcu_dereference_protected(queue->rps_map, 1); 857 if (map) { 858 RCU_INIT_POINTER(queue->rps_map, NULL); 859 kfree_rcu(map, rcu); 860 } 861 862 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); 863 if (flow_table) { 864 RCU_INIT_POINTER(queue->rps_flow_table, NULL); 865 call_rcu(&flow_table->rcu, rps_dev_flow_table_release); 866 } 867 #endif 868 869 memset(kobj, 0, sizeof(*kobj)); 870 dev_put(queue->dev); 871 } 872 873 static const void *rx_queue_namespace(struct kobject *kobj) 874 { 875 struct netdev_rx_queue *queue = to_rx_queue(kobj); 876 struct device *dev = &queue->dev->dev; 877 const void *ns = NULL; 878 879 if (dev->class && dev->class->ns_type) 880 ns = dev->class->namespace(dev); 881 882 return ns; 883 } 884 885 static struct kobj_type rx_queue_ktype = { 886 .sysfs_ops = &rx_queue_sysfs_ops, 887 .release = rx_queue_release, 888 .default_attrs = rx_queue_default_attrs, 889 .namespace = rx_queue_namespace 890 }; 891 892 static int rx_queue_add_kobject(struct net_device *dev, int index) 893 { 894 struct netdev_rx_queue *queue = dev->_rx + index; 895 struct kobject *kobj = &queue->kobj; 896 int error = 0; 897 898 kobj->kset = dev->queues_kset; 899 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 900 "rx-%u", index); 901 if (error) 902 goto exit; 903 904 if (dev->sysfs_rx_queue_group) { 905 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); 906 if (error) 907 goto exit; 908 } 909 910 kobject_uevent(kobj, KOBJ_ADD); 911 dev_hold(queue->dev); 912 913 return error; 914 exit: 915 kobject_put(kobj); 916 return error; 917 } 918 #endif /* CONFIG_SYSFS */ 919 920 int 921 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 922 { 923 #ifdef CONFIG_SYSFS 924 int i; 925 int error = 0; 926 927 #ifndef CONFIG_RPS 928 if (!dev->sysfs_rx_queue_group) 929 return 0; 930 #endif 931 for (i = old_num; i < new_num; i++) { 932 error = rx_queue_add_kobject(dev, i); 933 if (error) { 934 new_num = old_num; 935 break; 936 } 937 } 938 939 while (--i >= new_num) { 940 if (dev->sysfs_rx_queue_group) 941 sysfs_remove_group(&dev->_rx[i].kobj, 942 dev->sysfs_rx_queue_group); 943 kobject_put(&dev->_rx[i].kobj); 944 } 945 946 return error; 947 #else 948 return 0; 949 #endif 950 } 951 952 #ifdef CONFIG_SYSFS 953 /* 954 * netdev_queue sysfs structures and functions. 955 */ 956 struct netdev_queue_attribute { 957 struct attribute attr; 958 ssize_t (*show)(struct netdev_queue *queue, 959 struct netdev_queue_attribute *attr, char *buf); 960 ssize_t (*store)(struct netdev_queue *queue, 961 struct netdev_queue_attribute *attr, const char *buf, size_t len); 962 }; 963 #define to_netdev_queue_attr(_attr) container_of(_attr, \ 964 struct netdev_queue_attribute, attr) 965 966 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) 967 968 static ssize_t netdev_queue_attr_show(struct kobject *kobj, 969 struct attribute *attr, char *buf) 970 { 971 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 972 struct netdev_queue *queue = to_netdev_queue(kobj); 973 974 if (!attribute->show) 975 return -EIO; 976 977 return attribute->show(queue, attribute, buf); 978 } 979 980 static ssize_t netdev_queue_attr_store(struct kobject *kobj, 981 struct attribute *attr, 982 const char *buf, size_t count) 983 { 984 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 985 struct netdev_queue *queue = to_netdev_queue(kobj); 986 987 if (!attribute->store) 988 return -EIO; 989 990 return attribute->store(queue, attribute, buf, count); 991 } 992 993 static const struct sysfs_ops netdev_queue_sysfs_ops = { 994 .show = netdev_queue_attr_show, 995 .store = netdev_queue_attr_store, 996 }; 997 998 static ssize_t show_trans_timeout(struct netdev_queue *queue, 999 struct netdev_queue_attribute *attribute, 1000 char *buf) 1001 { 1002 unsigned long trans_timeout; 1003 1004 spin_lock_irq(&queue->_xmit_lock); 1005 trans_timeout = queue->trans_timeout; 1006 spin_unlock_irq(&queue->_xmit_lock); 1007 1008 return sprintf(buf, "%lu", trans_timeout); 1009 } 1010 1011 #ifdef CONFIG_XPS 1012 static unsigned int get_netdev_queue_index(struct netdev_queue *queue) 1013 { 1014 struct net_device *dev = queue->dev; 1015 unsigned int i; 1016 1017 i = queue - dev->_tx; 1018 BUG_ON(i >= dev->num_tx_queues); 1019 1020 return i; 1021 } 1022 1023 static ssize_t show_tx_maxrate(struct netdev_queue *queue, 1024 struct netdev_queue_attribute *attribute, 1025 char *buf) 1026 { 1027 return sprintf(buf, "%lu\n", queue->tx_maxrate); 1028 } 1029 1030 static ssize_t set_tx_maxrate(struct netdev_queue *queue, 1031 struct netdev_queue_attribute *attribute, 1032 const char *buf, size_t len) 1033 { 1034 struct net_device *dev = queue->dev; 1035 int err, index = get_netdev_queue_index(queue); 1036 u32 rate = 0; 1037 1038 err = kstrtou32(buf, 10, &rate); 1039 if (err < 0) 1040 return err; 1041 1042 if (!rtnl_trylock()) 1043 return restart_syscall(); 1044 1045 err = -EOPNOTSUPP; 1046 if (dev->netdev_ops->ndo_set_tx_maxrate) 1047 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate); 1048 1049 rtnl_unlock(); 1050 if (!err) { 1051 queue->tx_maxrate = rate; 1052 return len; 1053 } 1054 return err; 1055 } 1056 1057 static struct netdev_queue_attribute queue_tx_maxrate = 1058 __ATTR(tx_maxrate, S_IRUGO | S_IWUSR, 1059 show_tx_maxrate, set_tx_maxrate); 1060 #endif 1061 1062 static struct netdev_queue_attribute queue_trans_timeout = 1063 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL); 1064 1065 #ifdef CONFIG_BQL 1066 /* 1067 * Byte queue limits sysfs structures and functions. 1068 */ 1069 static ssize_t bql_show(char *buf, unsigned int value) 1070 { 1071 return sprintf(buf, "%u\n", value); 1072 } 1073 1074 static ssize_t bql_set(const char *buf, const size_t count, 1075 unsigned int *pvalue) 1076 { 1077 unsigned int value; 1078 int err; 1079 1080 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) 1081 value = DQL_MAX_LIMIT; 1082 else { 1083 err = kstrtouint(buf, 10, &value); 1084 if (err < 0) 1085 return err; 1086 if (value > DQL_MAX_LIMIT) 1087 return -EINVAL; 1088 } 1089 1090 *pvalue = value; 1091 1092 return count; 1093 } 1094 1095 static ssize_t bql_show_hold_time(struct netdev_queue *queue, 1096 struct netdev_queue_attribute *attr, 1097 char *buf) 1098 { 1099 struct dql *dql = &queue->dql; 1100 1101 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); 1102 } 1103 1104 static ssize_t bql_set_hold_time(struct netdev_queue *queue, 1105 struct netdev_queue_attribute *attribute, 1106 const char *buf, size_t len) 1107 { 1108 struct dql *dql = &queue->dql; 1109 unsigned int value; 1110 int err; 1111 1112 err = kstrtouint(buf, 10, &value); 1113 if (err < 0) 1114 return err; 1115 1116 dql->slack_hold_time = msecs_to_jiffies(value); 1117 1118 return len; 1119 } 1120 1121 static struct netdev_queue_attribute bql_hold_time_attribute = 1122 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time, 1123 bql_set_hold_time); 1124 1125 static ssize_t bql_show_inflight(struct netdev_queue *queue, 1126 struct netdev_queue_attribute *attr, 1127 char *buf) 1128 { 1129 struct dql *dql = &queue->dql; 1130 1131 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); 1132 } 1133 1134 static struct netdev_queue_attribute bql_inflight_attribute = 1135 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL); 1136 1137 #define BQL_ATTR(NAME, FIELD) \ 1138 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ 1139 struct netdev_queue_attribute *attr, \ 1140 char *buf) \ 1141 { \ 1142 return bql_show(buf, queue->dql.FIELD); \ 1143 } \ 1144 \ 1145 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ 1146 struct netdev_queue_attribute *attr, \ 1147 const char *buf, size_t len) \ 1148 { \ 1149 return bql_set(buf, len, &queue->dql.FIELD); \ 1150 } \ 1151 \ 1152 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \ 1153 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \ 1154 bql_set_ ## NAME); 1155 1156 BQL_ATTR(limit, limit) 1157 BQL_ATTR(limit_max, max_limit) 1158 BQL_ATTR(limit_min, min_limit) 1159 1160 static struct attribute *dql_attrs[] = { 1161 &bql_limit_attribute.attr, 1162 &bql_limit_max_attribute.attr, 1163 &bql_limit_min_attribute.attr, 1164 &bql_hold_time_attribute.attr, 1165 &bql_inflight_attribute.attr, 1166 NULL 1167 }; 1168 1169 static struct attribute_group dql_group = { 1170 .name = "byte_queue_limits", 1171 .attrs = dql_attrs, 1172 }; 1173 #endif /* CONFIG_BQL */ 1174 1175 #ifdef CONFIG_XPS 1176 static ssize_t show_xps_map(struct netdev_queue *queue, 1177 struct netdev_queue_attribute *attribute, char *buf) 1178 { 1179 struct net_device *dev = queue->dev; 1180 struct xps_dev_maps *dev_maps; 1181 cpumask_var_t mask; 1182 unsigned long index; 1183 int i, len; 1184 1185 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 1186 return -ENOMEM; 1187 1188 index = get_netdev_queue_index(queue); 1189 1190 rcu_read_lock(); 1191 dev_maps = rcu_dereference(dev->xps_maps); 1192 if (dev_maps) { 1193 for_each_possible_cpu(i) { 1194 struct xps_map *map = 1195 rcu_dereference(dev_maps->cpu_map[i]); 1196 if (map) { 1197 int j; 1198 for (j = 0; j < map->len; j++) { 1199 if (map->queues[j] == index) { 1200 cpumask_set_cpu(i, mask); 1201 break; 1202 } 1203 } 1204 } 1205 } 1206 } 1207 rcu_read_unlock(); 1208 1209 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 1210 free_cpumask_var(mask); 1211 return len < PAGE_SIZE ? len : -EINVAL; 1212 } 1213 1214 static ssize_t store_xps_map(struct netdev_queue *queue, 1215 struct netdev_queue_attribute *attribute, 1216 const char *buf, size_t len) 1217 { 1218 struct net_device *dev = queue->dev; 1219 unsigned long index; 1220 cpumask_var_t mask; 1221 int err; 1222 1223 if (!capable(CAP_NET_ADMIN)) 1224 return -EPERM; 1225 1226 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 1227 return -ENOMEM; 1228 1229 index = get_netdev_queue_index(queue); 1230 1231 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 1232 if (err) { 1233 free_cpumask_var(mask); 1234 return err; 1235 } 1236 1237 err = netif_set_xps_queue(dev, mask, index); 1238 1239 free_cpumask_var(mask); 1240 1241 return err ? : len; 1242 } 1243 1244 static struct netdev_queue_attribute xps_cpus_attribute = 1245 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map); 1246 #endif /* CONFIG_XPS */ 1247 1248 static struct attribute *netdev_queue_default_attrs[] = { 1249 &queue_trans_timeout.attr, 1250 #ifdef CONFIG_XPS 1251 &xps_cpus_attribute.attr, 1252 &queue_tx_maxrate.attr, 1253 #endif 1254 NULL 1255 }; 1256 1257 static void netdev_queue_release(struct kobject *kobj) 1258 { 1259 struct netdev_queue *queue = to_netdev_queue(kobj); 1260 1261 memset(kobj, 0, sizeof(*kobj)); 1262 dev_put(queue->dev); 1263 } 1264 1265 static const void *netdev_queue_namespace(struct kobject *kobj) 1266 { 1267 struct netdev_queue *queue = to_netdev_queue(kobj); 1268 struct device *dev = &queue->dev->dev; 1269 const void *ns = NULL; 1270 1271 if (dev->class && dev->class->ns_type) 1272 ns = dev->class->namespace(dev); 1273 1274 return ns; 1275 } 1276 1277 static struct kobj_type netdev_queue_ktype = { 1278 .sysfs_ops = &netdev_queue_sysfs_ops, 1279 .release = netdev_queue_release, 1280 .default_attrs = netdev_queue_default_attrs, 1281 .namespace = netdev_queue_namespace, 1282 }; 1283 1284 static int netdev_queue_add_kobject(struct net_device *dev, int index) 1285 { 1286 struct netdev_queue *queue = dev->_tx + index; 1287 struct kobject *kobj = &queue->kobj; 1288 int error = 0; 1289 1290 kobj->kset = dev->queues_kset; 1291 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, 1292 "tx-%u", index); 1293 if (error) 1294 goto exit; 1295 1296 #ifdef CONFIG_BQL 1297 error = sysfs_create_group(kobj, &dql_group); 1298 if (error) 1299 goto exit; 1300 #endif 1301 1302 kobject_uevent(kobj, KOBJ_ADD); 1303 dev_hold(queue->dev); 1304 1305 return 0; 1306 exit: 1307 kobject_put(kobj); 1308 return error; 1309 } 1310 #endif /* CONFIG_SYSFS */ 1311 1312 int 1313 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 1314 { 1315 #ifdef CONFIG_SYSFS 1316 int i; 1317 int error = 0; 1318 1319 for (i = old_num; i < new_num; i++) { 1320 error = netdev_queue_add_kobject(dev, i); 1321 if (error) { 1322 new_num = old_num; 1323 break; 1324 } 1325 } 1326 1327 while (--i >= new_num) { 1328 struct netdev_queue *queue = dev->_tx + i; 1329 1330 #ifdef CONFIG_BQL 1331 sysfs_remove_group(&queue->kobj, &dql_group); 1332 #endif 1333 kobject_put(&queue->kobj); 1334 } 1335 1336 return error; 1337 #else 1338 return 0; 1339 #endif /* CONFIG_SYSFS */ 1340 } 1341 1342 static int register_queue_kobjects(struct net_device *dev) 1343 { 1344 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; 1345 1346 #ifdef CONFIG_SYSFS 1347 dev->queues_kset = kset_create_and_add("queues", 1348 NULL, &dev->dev.kobj); 1349 if (!dev->queues_kset) 1350 return -ENOMEM; 1351 real_rx = dev->real_num_rx_queues; 1352 #endif 1353 real_tx = dev->real_num_tx_queues; 1354 1355 error = net_rx_queue_update_kobjects(dev, 0, real_rx); 1356 if (error) 1357 goto error; 1358 rxq = real_rx; 1359 1360 error = netdev_queue_update_kobjects(dev, 0, real_tx); 1361 if (error) 1362 goto error; 1363 txq = real_tx; 1364 1365 return 0; 1366 1367 error: 1368 netdev_queue_update_kobjects(dev, txq, 0); 1369 net_rx_queue_update_kobjects(dev, rxq, 0); 1370 return error; 1371 } 1372 1373 static void remove_queue_kobjects(struct net_device *dev) 1374 { 1375 int real_rx = 0, real_tx = 0; 1376 1377 #ifdef CONFIG_SYSFS 1378 real_rx = dev->real_num_rx_queues; 1379 #endif 1380 real_tx = dev->real_num_tx_queues; 1381 1382 net_rx_queue_update_kobjects(dev, real_rx, 0); 1383 netdev_queue_update_kobjects(dev, real_tx, 0); 1384 #ifdef CONFIG_SYSFS 1385 kset_unregister(dev->queues_kset); 1386 #endif 1387 } 1388 1389 static bool net_current_may_mount(void) 1390 { 1391 struct net *net = current->nsproxy->net_ns; 1392 1393 return ns_capable(net->user_ns, CAP_SYS_ADMIN); 1394 } 1395 1396 static void *net_grab_current_ns(void) 1397 { 1398 struct net *ns = current->nsproxy->net_ns; 1399 #ifdef CONFIG_NET_NS 1400 if (ns) 1401 atomic_inc(&ns->passive); 1402 #endif 1403 return ns; 1404 } 1405 1406 static const void *net_initial_ns(void) 1407 { 1408 return &init_net; 1409 } 1410 1411 static const void *net_netlink_ns(struct sock *sk) 1412 { 1413 return sock_net(sk); 1414 } 1415 1416 struct kobj_ns_type_operations net_ns_type_operations = { 1417 .type = KOBJ_NS_TYPE_NET, 1418 .current_may_mount = net_current_may_mount, 1419 .grab_current_ns = net_grab_current_ns, 1420 .netlink_ns = net_netlink_ns, 1421 .initial_ns = net_initial_ns, 1422 .drop_ns = net_drop_ns, 1423 }; 1424 EXPORT_SYMBOL_GPL(net_ns_type_operations); 1425 1426 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 1427 { 1428 struct net_device *dev = to_net_dev(d); 1429 int retval; 1430 1431 /* pass interface to uevent. */ 1432 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 1433 if (retval) 1434 goto exit; 1435 1436 /* pass ifindex to uevent. 1437 * ifindex is useful as it won't change (interface name may change) 1438 * and is what RtNetlink uses natively. */ 1439 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 1440 1441 exit: 1442 return retval; 1443 } 1444 1445 /* 1446 * netdev_release -- destroy and free a dead device. 1447 * Called when last reference to device kobject is gone. 1448 */ 1449 static void netdev_release(struct device *d) 1450 { 1451 struct net_device *dev = to_net_dev(d); 1452 1453 BUG_ON(dev->reg_state != NETREG_RELEASED); 1454 1455 kfree(dev->ifalias); 1456 netdev_freemem(dev); 1457 } 1458 1459 static const void *net_namespace(struct device *d) 1460 { 1461 struct net_device *dev = to_net_dev(d); 1462 1463 return dev_net(dev); 1464 } 1465 1466 static struct class net_class = { 1467 .name = "net", 1468 .dev_release = netdev_release, 1469 .dev_groups = net_class_groups, 1470 .dev_uevent = netdev_uevent, 1471 .ns_type = &net_ns_type_operations, 1472 .namespace = net_namespace, 1473 }; 1474 1475 #ifdef CONFIG_OF_NET 1476 static int of_dev_node_match(struct device *dev, const void *data) 1477 { 1478 int ret = 0; 1479 1480 if (dev->parent) 1481 ret = dev->parent->of_node == data; 1482 1483 return ret == 0 ? dev->of_node == data : ret; 1484 } 1485 1486 /* 1487 * of_find_net_device_by_node - lookup the net device for the device node 1488 * @np: OF device node 1489 * 1490 * Looks up the net_device structure corresponding with the device node. 1491 * If successful, returns a pointer to the net_device with the embedded 1492 * struct device refcount incremented by one, or NULL on failure. The 1493 * refcount must be dropped when done with the net_device. 1494 */ 1495 struct net_device *of_find_net_device_by_node(struct device_node *np) 1496 { 1497 struct device *dev; 1498 1499 dev = class_find_device(&net_class, NULL, np, of_dev_node_match); 1500 if (!dev) 1501 return NULL; 1502 1503 return to_net_dev(dev); 1504 } 1505 EXPORT_SYMBOL(of_find_net_device_by_node); 1506 #endif 1507 1508 /* Delete sysfs entries but hold kobject reference until after all 1509 * netdev references are gone. 1510 */ 1511 void netdev_unregister_kobject(struct net_device *ndev) 1512 { 1513 struct device *dev = &(ndev->dev); 1514 1515 kobject_get(&dev->kobj); 1516 1517 remove_queue_kobjects(ndev); 1518 1519 pm_runtime_set_memalloc_noio(dev, false); 1520 1521 device_del(dev); 1522 } 1523 1524 /* Create sysfs entries for network device. */ 1525 int netdev_register_kobject(struct net_device *ndev) 1526 { 1527 struct device *dev = &(ndev->dev); 1528 const struct attribute_group **groups = ndev->sysfs_groups; 1529 int error = 0; 1530 1531 device_initialize(dev); 1532 dev->class = &net_class; 1533 dev->platform_data = ndev; 1534 dev->groups = groups; 1535 1536 dev_set_name(dev, "%s", ndev->name); 1537 1538 #ifdef CONFIG_SYSFS 1539 /* Allow for a device specific group */ 1540 if (*groups) 1541 groups++; 1542 1543 *groups++ = &netstat_group; 1544 1545 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 1546 if (ndev->ieee80211_ptr) 1547 *groups++ = &wireless_group; 1548 #if IS_ENABLED(CONFIG_WIRELESS_EXT) 1549 else if (ndev->wireless_handlers) 1550 *groups++ = &wireless_group; 1551 #endif 1552 #endif 1553 #endif /* CONFIG_SYSFS */ 1554 1555 error = device_add(dev); 1556 if (error) 1557 return error; 1558 1559 error = register_queue_kobjects(ndev); 1560 if (error) { 1561 device_del(dev); 1562 return error; 1563 } 1564 1565 pm_runtime_set_memalloc_noio(dev, true); 1566 1567 return error; 1568 } 1569 1570 int netdev_class_create_file_ns(struct class_attribute *class_attr, 1571 const void *ns) 1572 { 1573 return class_create_file_ns(&net_class, class_attr, ns); 1574 } 1575 EXPORT_SYMBOL(netdev_class_create_file_ns); 1576 1577 void netdev_class_remove_file_ns(struct class_attribute *class_attr, 1578 const void *ns) 1579 { 1580 class_remove_file_ns(&net_class, class_attr, ns); 1581 } 1582 EXPORT_SYMBOL(netdev_class_remove_file_ns); 1583 1584 int __init netdev_kobject_init(void) 1585 { 1586 kobj_ns_type_register(&net_ns_type_operations); 1587 return class_register(&net_class); 1588 } 1589