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/sched/signal.h> 19 #include <linux/nsproxy.h> 20 #include <net/sock.h> 21 #include <net/net_namespace.h> 22 #include <linux/rtnetlink.h> 23 #include <linux/vmalloc.h> 24 #include <linux/export.h> 25 #include <linux/jiffies.h> 26 #include <linux/pm_runtime.h> 27 #include <linux/of.h> 28 #include <linux/of_net.h> 29 30 #include "net-sysfs.h" 31 32 #ifdef CONFIG_SYSFS 33 static const char fmt_hex[] = "%#x\n"; 34 static const char fmt_dec[] = "%d\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_link_ksettings cmd; 204 205 if (!__ethtool_get_link_ksettings(netdev, &cmd)) 206 ret = sprintf(buf, fmt_dec, cmd.base.speed); 207 } 208 rtnl_unlock(); 209 return ret; 210 } 211 static DEVICE_ATTR_RO(speed); 212 213 static ssize_t duplex_show(struct device *dev, 214 struct device_attribute *attr, char *buf) 215 { 216 struct net_device *netdev = to_net_dev(dev); 217 int ret = -EINVAL; 218 219 if (!rtnl_trylock()) 220 return restart_syscall(); 221 222 if (netif_running(netdev)) { 223 struct ethtool_link_ksettings cmd; 224 225 if (!__ethtool_get_link_ksettings(netdev, &cmd)) { 226 const char *duplex; 227 228 switch (cmd.base.duplex) { 229 case DUPLEX_HALF: 230 duplex = "half"; 231 break; 232 case DUPLEX_FULL: 233 duplex = "full"; 234 break; 235 default: 236 duplex = "unknown"; 237 break; 238 } 239 ret = sprintf(buf, "%s\n", duplex); 240 } 241 } 242 rtnl_unlock(); 243 return ret; 244 } 245 static DEVICE_ATTR_RO(duplex); 246 247 static ssize_t dormant_show(struct device *dev, 248 struct device_attribute *attr, char *buf) 249 { 250 struct net_device *netdev = to_net_dev(dev); 251 252 if (netif_running(netdev)) 253 return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); 254 255 return -EINVAL; 256 } 257 static DEVICE_ATTR_RO(dormant); 258 259 static const char *const operstates[] = { 260 "unknown", 261 "notpresent", /* currently unused */ 262 "down", 263 "lowerlayerdown", 264 "testing", /* currently unused */ 265 "dormant", 266 "up" 267 }; 268 269 static ssize_t operstate_show(struct device *dev, 270 struct device_attribute *attr, char *buf) 271 { 272 const struct net_device *netdev = to_net_dev(dev); 273 unsigned char operstate; 274 275 read_lock(&dev_base_lock); 276 operstate = netdev->operstate; 277 if (!netif_running(netdev)) 278 operstate = IF_OPER_DOWN; 279 read_unlock(&dev_base_lock); 280 281 if (operstate >= ARRAY_SIZE(operstates)) 282 return -EINVAL; /* should not happen */ 283 284 return sprintf(buf, "%s\n", operstates[operstate]); 285 } 286 static DEVICE_ATTR_RO(operstate); 287 288 static ssize_t carrier_changes_show(struct device *dev, 289 struct device_attribute *attr, 290 char *buf) 291 { 292 struct net_device *netdev = to_net_dev(dev); 293 return sprintf(buf, fmt_dec, 294 atomic_read(&netdev->carrier_changes)); 295 } 296 static DEVICE_ATTR_RO(carrier_changes); 297 298 /* read-write attributes */ 299 300 static int change_mtu(struct net_device *dev, unsigned long new_mtu) 301 { 302 return dev_set_mtu(dev, (int) new_mtu); 303 } 304 305 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr, 306 const char *buf, size_t len) 307 { 308 return netdev_store(dev, attr, buf, len, change_mtu); 309 } 310 NETDEVICE_SHOW_RW(mtu, fmt_dec); 311 312 static int change_flags(struct net_device *dev, unsigned long new_flags) 313 { 314 return dev_change_flags(dev, (unsigned int) new_flags); 315 } 316 317 static ssize_t flags_store(struct device *dev, struct device_attribute *attr, 318 const char *buf, size_t len) 319 { 320 return netdev_store(dev, attr, buf, len, change_flags); 321 } 322 NETDEVICE_SHOW_RW(flags, fmt_hex); 323 324 static int change_tx_queue_len(struct net_device *dev, unsigned long new_len) 325 { 326 unsigned int orig_len = dev->tx_queue_len; 327 int res; 328 329 if (new_len != (unsigned int)new_len) 330 return -ERANGE; 331 332 if (new_len != orig_len) { 333 dev->tx_queue_len = new_len; 334 res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev); 335 res = notifier_to_errno(res); 336 if (res) { 337 netdev_err(dev, 338 "refused to change device tx_queue_len\n"); 339 dev->tx_queue_len = orig_len; 340 return -EFAULT; 341 } 342 } 343 344 return 0; 345 } 346 347 static ssize_t tx_queue_len_store(struct device *dev, 348 struct device_attribute *attr, 349 const char *buf, size_t len) 350 { 351 if (!capable(CAP_NET_ADMIN)) 352 return -EPERM; 353 354 return netdev_store(dev, attr, buf, len, change_tx_queue_len); 355 } 356 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec); 357 358 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val) 359 { 360 dev->gro_flush_timeout = val; 361 return 0; 362 } 363 364 static ssize_t gro_flush_timeout_store(struct device *dev, 365 struct device_attribute *attr, 366 const char *buf, size_t len) 367 { 368 if (!capable(CAP_NET_ADMIN)) 369 return -EPERM; 370 371 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout); 372 } 373 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong); 374 375 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr, 376 const char *buf, size_t len) 377 { 378 struct net_device *netdev = to_net_dev(dev); 379 struct net *net = dev_net(netdev); 380 size_t count = len; 381 ssize_t ret; 382 383 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 384 return -EPERM; 385 386 /* ignore trailing newline */ 387 if (len > 0 && buf[len - 1] == '\n') 388 --count; 389 390 if (!rtnl_trylock()) 391 return restart_syscall(); 392 ret = dev_set_alias(netdev, buf, count); 393 rtnl_unlock(); 394 395 return ret < 0 ? ret : len; 396 } 397 398 static ssize_t ifalias_show(struct device *dev, 399 struct device_attribute *attr, char *buf) 400 { 401 const struct net_device *netdev = to_net_dev(dev); 402 ssize_t ret = 0; 403 404 if (!rtnl_trylock()) 405 return restart_syscall(); 406 if (netdev->ifalias) 407 ret = sprintf(buf, "%s\n", netdev->ifalias); 408 rtnl_unlock(); 409 return ret; 410 } 411 static DEVICE_ATTR_RW(ifalias); 412 413 static int change_group(struct net_device *dev, unsigned long new_group) 414 { 415 dev_set_group(dev, (int) new_group); 416 return 0; 417 } 418 419 static ssize_t group_store(struct device *dev, struct device_attribute *attr, 420 const char *buf, size_t len) 421 { 422 return netdev_store(dev, attr, buf, len, change_group); 423 } 424 NETDEVICE_SHOW(group, fmt_dec); 425 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store); 426 427 static int change_proto_down(struct net_device *dev, unsigned long proto_down) 428 { 429 return dev_change_proto_down(dev, (bool) proto_down); 430 } 431 432 static ssize_t proto_down_store(struct device *dev, 433 struct device_attribute *attr, 434 const char *buf, size_t len) 435 { 436 return netdev_store(dev, attr, buf, len, change_proto_down); 437 } 438 NETDEVICE_SHOW_RW(proto_down, fmt_dec); 439 440 static ssize_t phys_port_id_show(struct device *dev, 441 struct device_attribute *attr, char *buf) 442 { 443 struct net_device *netdev = to_net_dev(dev); 444 ssize_t ret = -EINVAL; 445 446 if (!rtnl_trylock()) 447 return restart_syscall(); 448 449 if (dev_isalive(netdev)) { 450 struct netdev_phys_item_id ppid; 451 452 ret = dev_get_phys_port_id(netdev, &ppid); 453 if (!ret) 454 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); 455 } 456 rtnl_unlock(); 457 458 return ret; 459 } 460 static DEVICE_ATTR_RO(phys_port_id); 461 462 static ssize_t phys_port_name_show(struct device *dev, 463 struct device_attribute *attr, char *buf) 464 { 465 struct net_device *netdev = to_net_dev(dev); 466 ssize_t ret = -EINVAL; 467 468 if (!rtnl_trylock()) 469 return restart_syscall(); 470 471 if (dev_isalive(netdev)) { 472 char name[IFNAMSIZ]; 473 474 ret = dev_get_phys_port_name(netdev, name, sizeof(name)); 475 if (!ret) 476 ret = sprintf(buf, "%s\n", name); 477 } 478 rtnl_unlock(); 479 480 return ret; 481 } 482 static DEVICE_ATTR_RO(phys_port_name); 483 484 static ssize_t phys_switch_id_show(struct device *dev, 485 struct device_attribute *attr, char *buf) 486 { 487 struct net_device *netdev = to_net_dev(dev); 488 ssize_t ret = -EINVAL; 489 490 if (!rtnl_trylock()) 491 return restart_syscall(); 492 493 if (dev_isalive(netdev)) { 494 struct switchdev_attr attr = { 495 .orig_dev = netdev, 496 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 497 .flags = SWITCHDEV_F_NO_RECURSE, 498 }; 499 500 ret = switchdev_port_attr_get(netdev, &attr); 501 if (!ret) 502 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len, 503 attr.u.ppid.id); 504 } 505 rtnl_unlock(); 506 507 return ret; 508 } 509 static DEVICE_ATTR_RO(phys_switch_id); 510 511 static struct attribute *net_class_attrs[] = { 512 &dev_attr_netdev_group.attr, 513 &dev_attr_type.attr, 514 &dev_attr_dev_id.attr, 515 &dev_attr_dev_port.attr, 516 &dev_attr_iflink.attr, 517 &dev_attr_ifindex.attr, 518 &dev_attr_name_assign_type.attr, 519 &dev_attr_addr_assign_type.attr, 520 &dev_attr_addr_len.attr, 521 &dev_attr_link_mode.attr, 522 &dev_attr_address.attr, 523 &dev_attr_broadcast.attr, 524 &dev_attr_speed.attr, 525 &dev_attr_duplex.attr, 526 &dev_attr_dormant.attr, 527 &dev_attr_operstate.attr, 528 &dev_attr_carrier_changes.attr, 529 &dev_attr_ifalias.attr, 530 &dev_attr_carrier.attr, 531 &dev_attr_mtu.attr, 532 &dev_attr_flags.attr, 533 &dev_attr_tx_queue_len.attr, 534 &dev_attr_gro_flush_timeout.attr, 535 &dev_attr_phys_port_id.attr, 536 &dev_attr_phys_port_name.attr, 537 &dev_attr_phys_switch_id.attr, 538 &dev_attr_proto_down.attr, 539 NULL, 540 }; 541 ATTRIBUTE_GROUPS(net_class); 542 543 /* Show a given an attribute in the statistics group */ 544 static ssize_t netstat_show(const struct device *d, 545 struct device_attribute *attr, char *buf, 546 unsigned long offset) 547 { 548 struct net_device *dev = to_net_dev(d); 549 ssize_t ret = -EINVAL; 550 551 WARN_ON(offset > sizeof(struct rtnl_link_stats64) || 552 offset % sizeof(u64) != 0); 553 554 read_lock(&dev_base_lock); 555 if (dev_isalive(dev)) { 556 struct rtnl_link_stats64 temp; 557 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 558 559 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset)); 560 } 561 read_unlock(&dev_base_lock); 562 return ret; 563 } 564 565 /* generate a read-only statistics attribute */ 566 #define NETSTAT_ENTRY(name) \ 567 static ssize_t name##_show(struct device *d, \ 568 struct device_attribute *attr, char *buf) \ 569 { \ 570 return netstat_show(d, attr, buf, \ 571 offsetof(struct rtnl_link_stats64, name)); \ 572 } \ 573 static DEVICE_ATTR_RO(name) 574 575 NETSTAT_ENTRY(rx_packets); 576 NETSTAT_ENTRY(tx_packets); 577 NETSTAT_ENTRY(rx_bytes); 578 NETSTAT_ENTRY(tx_bytes); 579 NETSTAT_ENTRY(rx_errors); 580 NETSTAT_ENTRY(tx_errors); 581 NETSTAT_ENTRY(rx_dropped); 582 NETSTAT_ENTRY(tx_dropped); 583 NETSTAT_ENTRY(multicast); 584 NETSTAT_ENTRY(collisions); 585 NETSTAT_ENTRY(rx_length_errors); 586 NETSTAT_ENTRY(rx_over_errors); 587 NETSTAT_ENTRY(rx_crc_errors); 588 NETSTAT_ENTRY(rx_frame_errors); 589 NETSTAT_ENTRY(rx_fifo_errors); 590 NETSTAT_ENTRY(rx_missed_errors); 591 NETSTAT_ENTRY(tx_aborted_errors); 592 NETSTAT_ENTRY(tx_carrier_errors); 593 NETSTAT_ENTRY(tx_fifo_errors); 594 NETSTAT_ENTRY(tx_heartbeat_errors); 595 NETSTAT_ENTRY(tx_window_errors); 596 NETSTAT_ENTRY(rx_compressed); 597 NETSTAT_ENTRY(tx_compressed); 598 NETSTAT_ENTRY(rx_nohandler); 599 600 static struct attribute *netstat_attrs[] = { 601 &dev_attr_rx_packets.attr, 602 &dev_attr_tx_packets.attr, 603 &dev_attr_rx_bytes.attr, 604 &dev_attr_tx_bytes.attr, 605 &dev_attr_rx_errors.attr, 606 &dev_attr_tx_errors.attr, 607 &dev_attr_rx_dropped.attr, 608 &dev_attr_tx_dropped.attr, 609 &dev_attr_multicast.attr, 610 &dev_attr_collisions.attr, 611 &dev_attr_rx_length_errors.attr, 612 &dev_attr_rx_over_errors.attr, 613 &dev_attr_rx_crc_errors.attr, 614 &dev_attr_rx_frame_errors.attr, 615 &dev_attr_rx_fifo_errors.attr, 616 &dev_attr_rx_missed_errors.attr, 617 &dev_attr_tx_aborted_errors.attr, 618 &dev_attr_tx_carrier_errors.attr, 619 &dev_attr_tx_fifo_errors.attr, 620 &dev_attr_tx_heartbeat_errors.attr, 621 &dev_attr_tx_window_errors.attr, 622 &dev_attr_rx_compressed.attr, 623 &dev_attr_tx_compressed.attr, 624 &dev_attr_rx_nohandler.attr, 625 NULL 626 }; 627 628 629 static const struct attribute_group netstat_group = { 630 .name = "statistics", 631 .attrs = netstat_attrs, 632 }; 633 634 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 635 static struct attribute *wireless_attrs[] = { 636 NULL 637 }; 638 639 static const struct attribute_group wireless_group = { 640 .name = "wireless", 641 .attrs = wireless_attrs, 642 }; 643 #endif 644 645 #else /* CONFIG_SYSFS */ 646 #define net_class_groups NULL 647 #endif /* CONFIG_SYSFS */ 648 649 #ifdef CONFIG_SYSFS 650 #define to_rx_queue_attr(_attr) container_of(_attr, \ 651 struct rx_queue_attribute, attr) 652 653 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 654 655 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 656 char *buf) 657 { 658 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 659 struct netdev_rx_queue *queue = to_rx_queue(kobj); 660 661 if (!attribute->show) 662 return -EIO; 663 664 return attribute->show(queue, attribute, buf); 665 } 666 667 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 668 const char *buf, size_t count) 669 { 670 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 671 struct netdev_rx_queue *queue = to_rx_queue(kobj); 672 673 if (!attribute->store) 674 return -EIO; 675 676 return attribute->store(queue, attribute, buf, count); 677 } 678 679 static const struct sysfs_ops rx_queue_sysfs_ops = { 680 .show = rx_queue_attr_show, 681 .store = rx_queue_attr_store, 682 }; 683 684 #ifdef CONFIG_RPS 685 static ssize_t show_rps_map(struct netdev_rx_queue *queue, 686 struct rx_queue_attribute *attribute, char *buf) 687 { 688 struct rps_map *map; 689 cpumask_var_t mask; 690 int i, len; 691 692 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 693 return -ENOMEM; 694 695 rcu_read_lock(); 696 map = rcu_dereference(queue->rps_map); 697 if (map) 698 for (i = 0; i < map->len; i++) 699 cpumask_set_cpu(map->cpus[i], mask); 700 701 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 702 rcu_read_unlock(); 703 free_cpumask_var(mask); 704 705 return len < PAGE_SIZE ? len : -EINVAL; 706 } 707 708 static ssize_t store_rps_map(struct netdev_rx_queue *queue, 709 struct rx_queue_attribute *attribute, 710 const char *buf, size_t len) 711 { 712 struct rps_map *old_map, *map; 713 cpumask_var_t mask; 714 int err, cpu, i; 715 static DEFINE_MUTEX(rps_map_mutex); 716 717 if (!capable(CAP_NET_ADMIN)) 718 return -EPERM; 719 720 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 721 return -ENOMEM; 722 723 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 724 if (err) { 725 free_cpumask_var(mask); 726 return err; 727 } 728 729 map = kzalloc(max_t(unsigned int, 730 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 731 GFP_KERNEL); 732 if (!map) { 733 free_cpumask_var(mask); 734 return -ENOMEM; 735 } 736 737 i = 0; 738 for_each_cpu_and(cpu, mask, cpu_online_mask) 739 map->cpus[i++] = cpu; 740 741 if (i) 742 map->len = i; 743 else { 744 kfree(map); 745 map = NULL; 746 } 747 748 mutex_lock(&rps_map_mutex); 749 old_map = rcu_dereference_protected(queue->rps_map, 750 mutex_is_locked(&rps_map_mutex)); 751 rcu_assign_pointer(queue->rps_map, map); 752 753 if (map) 754 static_key_slow_inc(&rps_needed); 755 if (old_map) 756 static_key_slow_dec(&rps_needed); 757 758 mutex_unlock(&rps_map_mutex); 759 760 if (old_map) 761 kfree_rcu(old_map, rcu); 762 763 free_cpumask_var(mask); 764 return len; 765 } 766 767 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 768 struct rx_queue_attribute *attr, 769 char *buf) 770 { 771 struct rps_dev_flow_table *flow_table; 772 unsigned long val = 0; 773 774 rcu_read_lock(); 775 flow_table = rcu_dereference(queue->rps_flow_table); 776 if (flow_table) 777 val = (unsigned long)flow_table->mask + 1; 778 rcu_read_unlock(); 779 780 return sprintf(buf, "%lu\n", val); 781 } 782 783 static void rps_dev_flow_table_release(struct rcu_head *rcu) 784 { 785 struct rps_dev_flow_table *table = container_of(rcu, 786 struct rps_dev_flow_table, rcu); 787 vfree(table); 788 } 789 790 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 791 struct rx_queue_attribute *attr, 792 const char *buf, size_t len) 793 { 794 unsigned long mask, count; 795 struct rps_dev_flow_table *table, *old_table; 796 static DEFINE_SPINLOCK(rps_dev_flow_lock); 797 int rc; 798 799 if (!capable(CAP_NET_ADMIN)) 800 return -EPERM; 801 802 rc = kstrtoul(buf, 0, &count); 803 if (rc < 0) 804 return rc; 805 806 if (count) { 807 mask = count - 1; 808 /* mask = roundup_pow_of_two(count) - 1; 809 * without overflows... 810 */ 811 while ((mask | (mask >> 1)) != mask) 812 mask |= (mask >> 1); 813 /* On 64 bit arches, must check mask fits in table->mask (u32), 814 * and on 32bit arches, must check 815 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow. 816 */ 817 #if BITS_PER_LONG > 32 818 if (mask > (unsigned long)(u32)mask) 819 return -EINVAL; 820 #else 821 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) 822 / sizeof(struct rps_dev_flow)) { 823 /* Enforce a limit to prevent overflow */ 824 return -EINVAL; 825 } 826 #endif 827 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); 828 if (!table) 829 return -ENOMEM; 830 831 table->mask = mask; 832 for (count = 0; count <= mask; count++) 833 table->flows[count].cpu = RPS_NO_CPU; 834 } else 835 table = NULL; 836 837 spin_lock(&rps_dev_flow_lock); 838 old_table = rcu_dereference_protected(queue->rps_flow_table, 839 lockdep_is_held(&rps_dev_flow_lock)); 840 rcu_assign_pointer(queue->rps_flow_table, table); 841 spin_unlock(&rps_dev_flow_lock); 842 843 if (old_table) 844 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 845 846 return len; 847 } 848 849 static struct rx_queue_attribute rps_cpus_attribute = 850 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); 851 852 853 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = 854 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, 855 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 856 #endif /* CONFIG_RPS */ 857 858 static struct attribute *rx_queue_default_attrs[] = { 859 #ifdef CONFIG_RPS 860 &rps_cpus_attribute.attr, 861 &rps_dev_flow_table_cnt_attribute.attr, 862 #endif 863 NULL 864 }; 865 866 static void rx_queue_release(struct kobject *kobj) 867 { 868 struct netdev_rx_queue *queue = to_rx_queue(kobj); 869 #ifdef CONFIG_RPS 870 struct rps_map *map; 871 struct rps_dev_flow_table *flow_table; 872 873 874 map = rcu_dereference_protected(queue->rps_map, 1); 875 if (map) { 876 RCU_INIT_POINTER(queue->rps_map, NULL); 877 kfree_rcu(map, rcu); 878 } 879 880 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); 881 if (flow_table) { 882 RCU_INIT_POINTER(queue->rps_flow_table, NULL); 883 call_rcu(&flow_table->rcu, rps_dev_flow_table_release); 884 } 885 #endif 886 887 memset(kobj, 0, sizeof(*kobj)); 888 dev_put(queue->dev); 889 } 890 891 static const void *rx_queue_namespace(struct kobject *kobj) 892 { 893 struct netdev_rx_queue *queue = to_rx_queue(kobj); 894 struct device *dev = &queue->dev->dev; 895 const void *ns = NULL; 896 897 if (dev->class && dev->class->ns_type) 898 ns = dev->class->namespace(dev); 899 900 return ns; 901 } 902 903 static struct kobj_type rx_queue_ktype = { 904 .sysfs_ops = &rx_queue_sysfs_ops, 905 .release = rx_queue_release, 906 .default_attrs = rx_queue_default_attrs, 907 .namespace = rx_queue_namespace 908 }; 909 910 static int rx_queue_add_kobject(struct net_device *dev, int index) 911 { 912 struct netdev_rx_queue *queue = dev->_rx + index; 913 struct kobject *kobj = &queue->kobj; 914 int error = 0; 915 916 kobj->kset = dev->queues_kset; 917 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 918 "rx-%u", index); 919 if (error) 920 goto exit; 921 922 if (dev->sysfs_rx_queue_group) { 923 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); 924 if (error) 925 goto exit; 926 } 927 928 kobject_uevent(kobj, KOBJ_ADD); 929 dev_hold(queue->dev); 930 931 return error; 932 exit: 933 kobject_put(kobj); 934 return error; 935 } 936 #endif /* CONFIG_SYSFS */ 937 938 int 939 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 940 { 941 #ifdef CONFIG_SYSFS 942 int i; 943 int error = 0; 944 945 #ifndef CONFIG_RPS 946 if (!dev->sysfs_rx_queue_group) 947 return 0; 948 #endif 949 for (i = old_num; i < new_num; i++) { 950 error = rx_queue_add_kobject(dev, i); 951 if (error) { 952 new_num = old_num; 953 break; 954 } 955 } 956 957 while (--i >= new_num) { 958 struct kobject *kobj = &dev->_rx[i].kobj; 959 960 if (!atomic_read(&dev_net(dev)->count)) 961 kobj->uevent_suppress = 1; 962 if (dev->sysfs_rx_queue_group) 963 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group); 964 kobject_put(kobj); 965 } 966 967 return error; 968 #else 969 return 0; 970 #endif 971 } 972 973 #ifdef CONFIG_SYSFS 974 /* 975 * netdev_queue sysfs structures and functions. 976 */ 977 struct netdev_queue_attribute { 978 struct attribute attr; 979 ssize_t (*show)(struct netdev_queue *queue, 980 struct netdev_queue_attribute *attr, char *buf); 981 ssize_t (*store)(struct netdev_queue *queue, 982 struct netdev_queue_attribute *attr, const char *buf, size_t len); 983 }; 984 #define to_netdev_queue_attr(_attr) container_of(_attr, \ 985 struct netdev_queue_attribute, attr) 986 987 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) 988 989 static ssize_t netdev_queue_attr_show(struct kobject *kobj, 990 struct attribute *attr, char *buf) 991 { 992 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 993 struct netdev_queue *queue = to_netdev_queue(kobj); 994 995 if (!attribute->show) 996 return -EIO; 997 998 return attribute->show(queue, attribute, buf); 999 } 1000 1001 static ssize_t netdev_queue_attr_store(struct kobject *kobj, 1002 struct attribute *attr, 1003 const char *buf, size_t count) 1004 { 1005 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 1006 struct netdev_queue *queue = to_netdev_queue(kobj); 1007 1008 if (!attribute->store) 1009 return -EIO; 1010 1011 return attribute->store(queue, attribute, buf, count); 1012 } 1013 1014 static const struct sysfs_ops netdev_queue_sysfs_ops = { 1015 .show = netdev_queue_attr_show, 1016 .store = netdev_queue_attr_store, 1017 }; 1018 1019 static ssize_t show_trans_timeout(struct netdev_queue *queue, 1020 struct netdev_queue_attribute *attribute, 1021 char *buf) 1022 { 1023 unsigned long trans_timeout; 1024 1025 spin_lock_irq(&queue->_xmit_lock); 1026 trans_timeout = queue->trans_timeout; 1027 spin_unlock_irq(&queue->_xmit_lock); 1028 1029 return sprintf(buf, "%lu", trans_timeout); 1030 } 1031 1032 static unsigned int get_netdev_queue_index(struct netdev_queue *queue) 1033 { 1034 struct net_device *dev = queue->dev; 1035 unsigned int i; 1036 1037 i = queue - dev->_tx; 1038 BUG_ON(i >= dev->num_tx_queues); 1039 1040 return i; 1041 } 1042 1043 static ssize_t show_traffic_class(struct netdev_queue *queue, 1044 struct netdev_queue_attribute *attribute, 1045 char *buf) 1046 { 1047 struct net_device *dev = queue->dev; 1048 int index = get_netdev_queue_index(queue); 1049 int tc = netdev_txq_to_tc(dev, index); 1050 1051 if (tc < 0) 1052 return -EINVAL; 1053 1054 return sprintf(buf, "%u\n", tc); 1055 } 1056 1057 #ifdef CONFIG_XPS 1058 static ssize_t show_tx_maxrate(struct netdev_queue *queue, 1059 struct netdev_queue_attribute *attribute, 1060 char *buf) 1061 { 1062 return sprintf(buf, "%lu\n", queue->tx_maxrate); 1063 } 1064 1065 static ssize_t set_tx_maxrate(struct netdev_queue *queue, 1066 struct netdev_queue_attribute *attribute, 1067 const char *buf, size_t len) 1068 { 1069 struct net_device *dev = queue->dev; 1070 int err, index = get_netdev_queue_index(queue); 1071 u32 rate = 0; 1072 1073 err = kstrtou32(buf, 10, &rate); 1074 if (err < 0) 1075 return err; 1076 1077 if (!rtnl_trylock()) 1078 return restart_syscall(); 1079 1080 err = -EOPNOTSUPP; 1081 if (dev->netdev_ops->ndo_set_tx_maxrate) 1082 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate); 1083 1084 rtnl_unlock(); 1085 if (!err) { 1086 queue->tx_maxrate = rate; 1087 return len; 1088 } 1089 return err; 1090 } 1091 1092 static struct netdev_queue_attribute queue_tx_maxrate = 1093 __ATTR(tx_maxrate, S_IRUGO | S_IWUSR, 1094 show_tx_maxrate, set_tx_maxrate); 1095 #endif 1096 1097 static struct netdev_queue_attribute queue_trans_timeout = 1098 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL); 1099 1100 static struct netdev_queue_attribute queue_traffic_class = 1101 __ATTR(traffic_class, S_IRUGO, show_traffic_class, NULL); 1102 1103 #ifdef CONFIG_BQL 1104 /* 1105 * Byte queue limits sysfs structures and functions. 1106 */ 1107 static ssize_t bql_show(char *buf, unsigned int value) 1108 { 1109 return sprintf(buf, "%u\n", value); 1110 } 1111 1112 static ssize_t bql_set(const char *buf, const size_t count, 1113 unsigned int *pvalue) 1114 { 1115 unsigned int value; 1116 int err; 1117 1118 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) 1119 value = DQL_MAX_LIMIT; 1120 else { 1121 err = kstrtouint(buf, 10, &value); 1122 if (err < 0) 1123 return err; 1124 if (value > DQL_MAX_LIMIT) 1125 return -EINVAL; 1126 } 1127 1128 *pvalue = value; 1129 1130 return count; 1131 } 1132 1133 static ssize_t bql_show_hold_time(struct netdev_queue *queue, 1134 struct netdev_queue_attribute *attr, 1135 char *buf) 1136 { 1137 struct dql *dql = &queue->dql; 1138 1139 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); 1140 } 1141 1142 static ssize_t bql_set_hold_time(struct netdev_queue *queue, 1143 struct netdev_queue_attribute *attribute, 1144 const char *buf, size_t len) 1145 { 1146 struct dql *dql = &queue->dql; 1147 unsigned int value; 1148 int err; 1149 1150 err = kstrtouint(buf, 10, &value); 1151 if (err < 0) 1152 return err; 1153 1154 dql->slack_hold_time = msecs_to_jiffies(value); 1155 1156 return len; 1157 } 1158 1159 static struct netdev_queue_attribute bql_hold_time_attribute = 1160 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time, 1161 bql_set_hold_time); 1162 1163 static ssize_t bql_show_inflight(struct netdev_queue *queue, 1164 struct netdev_queue_attribute *attr, 1165 char *buf) 1166 { 1167 struct dql *dql = &queue->dql; 1168 1169 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); 1170 } 1171 1172 static struct netdev_queue_attribute bql_inflight_attribute = 1173 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL); 1174 1175 #define BQL_ATTR(NAME, FIELD) \ 1176 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ 1177 struct netdev_queue_attribute *attr, \ 1178 char *buf) \ 1179 { \ 1180 return bql_show(buf, queue->dql.FIELD); \ 1181 } \ 1182 \ 1183 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ 1184 struct netdev_queue_attribute *attr, \ 1185 const char *buf, size_t len) \ 1186 { \ 1187 return bql_set(buf, len, &queue->dql.FIELD); \ 1188 } \ 1189 \ 1190 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \ 1191 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \ 1192 bql_set_ ## NAME); 1193 1194 BQL_ATTR(limit, limit) 1195 BQL_ATTR(limit_max, max_limit) 1196 BQL_ATTR(limit_min, min_limit) 1197 1198 static struct attribute *dql_attrs[] = { 1199 &bql_limit_attribute.attr, 1200 &bql_limit_max_attribute.attr, 1201 &bql_limit_min_attribute.attr, 1202 &bql_hold_time_attribute.attr, 1203 &bql_inflight_attribute.attr, 1204 NULL 1205 }; 1206 1207 static const struct attribute_group dql_group = { 1208 .name = "byte_queue_limits", 1209 .attrs = dql_attrs, 1210 }; 1211 #endif /* CONFIG_BQL */ 1212 1213 #ifdef CONFIG_XPS 1214 static ssize_t show_xps_map(struct netdev_queue *queue, 1215 struct netdev_queue_attribute *attribute, char *buf) 1216 { 1217 struct net_device *dev = queue->dev; 1218 int cpu, len, num_tc = 1, tc = 0; 1219 struct xps_dev_maps *dev_maps; 1220 cpumask_var_t mask; 1221 unsigned long index; 1222 1223 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 1224 return -ENOMEM; 1225 1226 index = get_netdev_queue_index(queue); 1227 1228 if (dev->num_tc) { 1229 num_tc = dev->num_tc; 1230 tc = netdev_txq_to_tc(dev, index); 1231 if (tc < 0) 1232 return -EINVAL; 1233 } 1234 1235 rcu_read_lock(); 1236 dev_maps = rcu_dereference(dev->xps_maps); 1237 if (dev_maps) { 1238 for_each_possible_cpu(cpu) { 1239 int i, tci = cpu * num_tc + tc; 1240 struct xps_map *map; 1241 1242 map = rcu_dereference(dev_maps->cpu_map[tci]); 1243 if (!map) 1244 continue; 1245 1246 for (i = map->len; i--;) { 1247 if (map->queues[i] == index) { 1248 cpumask_set_cpu(cpu, mask); 1249 break; 1250 } 1251 } 1252 } 1253 } 1254 rcu_read_unlock(); 1255 1256 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 1257 free_cpumask_var(mask); 1258 return len < PAGE_SIZE ? len : -EINVAL; 1259 } 1260 1261 static ssize_t store_xps_map(struct netdev_queue *queue, 1262 struct netdev_queue_attribute *attribute, 1263 const char *buf, size_t len) 1264 { 1265 struct net_device *dev = queue->dev; 1266 unsigned long index; 1267 cpumask_var_t mask; 1268 int err; 1269 1270 if (!capable(CAP_NET_ADMIN)) 1271 return -EPERM; 1272 1273 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 1274 return -ENOMEM; 1275 1276 index = get_netdev_queue_index(queue); 1277 1278 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 1279 if (err) { 1280 free_cpumask_var(mask); 1281 return err; 1282 } 1283 1284 err = netif_set_xps_queue(dev, mask, index); 1285 1286 free_cpumask_var(mask); 1287 1288 return err ? : len; 1289 } 1290 1291 static struct netdev_queue_attribute xps_cpus_attribute = 1292 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map); 1293 #endif /* CONFIG_XPS */ 1294 1295 static struct attribute *netdev_queue_default_attrs[] = { 1296 &queue_trans_timeout.attr, 1297 &queue_traffic_class.attr, 1298 #ifdef CONFIG_XPS 1299 &xps_cpus_attribute.attr, 1300 &queue_tx_maxrate.attr, 1301 #endif 1302 NULL 1303 }; 1304 1305 static void netdev_queue_release(struct kobject *kobj) 1306 { 1307 struct netdev_queue *queue = to_netdev_queue(kobj); 1308 1309 memset(kobj, 0, sizeof(*kobj)); 1310 dev_put(queue->dev); 1311 } 1312 1313 static const void *netdev_queue_namespace(struct kobject *kobj) 1314 { 1315 struct netdev_queue *queue = to_netdev_queue(kobj); 1316 struct device *dev = &queue->dev->dev; 1317 const void *ns = NULL; 1318 1319 if (dev->class && dev->class->ns_type) 1320 ns = dev->class->namespace(dev); 1321 1322 return ns; 1323 } 1324 1325 static struct kobj_type netdev_queue_ktype = { 1326 .sysfs_ops = &netdev_queue_sysfs_ops, 1327 .release = netdev_queue_release, 1328 .default_attrs = netdev_queue_default_attrs, 1329 .namespace = netdev_queue_namespace, 1330 }; 1331 1332 static int netdev_queue_add_kobject(struct net_device *dev, int index) 1333 { 1334 struct netdev_queue *queue = dev->_tx + index; 1335 struct kobject *kobj = &queue->kobj; 1336 int error = 0; 1337 1338 kobj->kset = dev->queues_kset; 1339 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, 1340 "tx-%u", index); 1341 if (error) 1342 goto exit; 1343 1344 #ifdef CONFIG_BQL 1345 error = sysfs_create_group(kobj, &dql_group); 1346 if (error) 1347 goto exit; 1348 #endif 1349 1350 kobject_uevent(kobj, KOBJ_ADD); 1351 dev_hold(queue->dev); 1352 1353 return 0; 1354 exit: 1355 kobject_put(kobj); 1356 return error; 1357 } 1358 #endif /* CONFIG_SYSFS */ 1359 1360 int 1361 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 1362 { 1363 #ifdef CONFIG_SYSFS 1364 int i; 1365 int error = 0; 1366 1367 for (i = old_num; i < new_num; i++) { 1368 error = netdev_queue_add_kobject(dev, i); 1369 if (error) { 1370 new_num = old_num; 1371 break; 1372 } 1373 } 1374 1375 while (--i >= new_num) { 1376 struct netdev_queue *queue = dev->_tx + i; 1377 1378 if (!atomic_read(&dev_net(dev)->count)) 1379 queue->kobj.uevent_suppress = 1; 1380 #ifdef CONFIG_BQL 1381 sysfs_remove_group(&queue->kobj, &dql_group); 1382 #endif 1383 kobject_put(&queue->kobj); 1384 } 1385 1386 return error; 1387 #else 1388 return 0; 1389 #endif /* CONFIG_SYSFS */ 1390 } 1391 1392 static int register_queue_kobjects(struct net_device *dev) 1393 { 1394 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; 1395 1396 #ifdef CONFIG_SYSFS 1397 dev->queues_kset = kset_create_and_add("queues", 1398 NULL, &dev->dev.kobj); 1399 if (!dev->queues_kset) 1400 return -ENOMEM; 1401 real_rx = dev->real_num_rx_queues; 1402 #endif 1403 real_tx = dev->real_num_tx_queues; 1404 1405 error = net_rx_queue_update_kobjects(dev, 0, real_rx); 1406 if (error) 1407 goto error; 1408 rxq = real_rx; 1409 1410 error = netdev_queue_update_kobjects(dev, 0, real_tx); 1411 if (error) 1412 goto error; 1413 txq = real_tx; 1414 1415 return 0; 1416 1417 error: 1418 netdev_queue_update_kobjects(dev, txq, 0); 1419 net_rx_queue_update_kobjects(dev, rxq, 0); 1420 return error; 1421 } 1422 1423 static void remove_queue_kobjects(struct net_device *dev) 1424 { 1425 int real_rx = 0, real_tx = 0; 1426 1427 #ifdef CONFIG_SYSFS 1428 real_rx = dev->real_num_rx_queues; 1429 #endif 1430 real_tx = dev->real_num_tx_queues; 1431 1432 net_rx_queue_update_kobjects(dev, real_rx, 0); 1433 netdev_queue_update_kobjects(dev, real_tx, 0); 1434 #ifdef CONFIG_SYSFS 1435 kset_unregister(dev->queues_kset); 1436 #endif 1437 } 1438 1439 static bool net_current_may_mount(void) 1440 { 1441 struct net *net = current->nsproxy->net_ns; 1442 1443 return ns_capable(net->user_ns, CAP_SYS_ADMIN); 1444 } 1445 1446 static void *net_grab_current_ns(void) 1447 { 1448 struct net *ns = current->nsproxy->net_ns; 1449 #ifdef CONFIG_NET_NS 1450 if (ns) 1451 refcount_inc(&ns->passive); 1452 #endif 1453 return ns; 1454 } 1455 1456 static const void *net_initial_ns(void) 1457 { 1458 return &init_net; 1459 } 1460 1461 static const void *net_netlink_ns(struct sock *sk) 1462 { 1463 return sock_net(sk); 1464 } 1465 1466 struct kobj_ns_type_operations net_ns_type_operations = { 1467 .type = KOBJ_NS_TYPE_NET, 1468 .current_may_mount = net_current_may_mount, 1469 .grab_current_ns = net_grab_current_ns, 1470 .netlink_ns = net_netlink_ns, 1471 .initial_ns = net_initial_ns, 1472 .drop_ns = net_drop_ns, 1473 }; 1474 EXPORT_SYMBOL_GPL(net_ns_type_operations); 1475 1476 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 1477 { 1478 struct net_device *dev = to_net_dev(d); 1479 int retval; 1480 1481 /* pass interface to uevent. */ 1482 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 1483 if (retval) 1484 goto exit; 1485 1486 /* pass ifindex to uevent. 1487 * ifindex is useful as it won't change (interface name may change) 1488 * and is what RtNetlink uses natively. */ 1489 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 1490 1491 exit: 1492 return retval; 1493 } 1494 1495 /* 1496 * netdev_release -- destroy and free a dead device. 1497 * Called when last reference to device kobject is gone. 1498 */ 1499 static void netdev_release(struct device *d) 1500 { 1501 struct net_device *dev = to_net_dev(d); 1502 1503 BUG_ON(dev->reg_state != NETREG_RELEASED); 1504 1505 kfree(dev->ifalias); 1506 netdev_freemem(dev); 1507 } 1508 1509 static const void *net_namespace(struct device *d) 1510 { 1511 struct net_device *dev = to_net_dev(d); 1512 1513 return dev_net(dev); 1514 } 1515 1516 static struct class net_class = { 1517 .name = "net", 1518 .dev_release = netdev_release, 1519 .dev_groups = net_class_groups, 1520 .dev_uevent = netdev_uevent, 1521 .ns_type = &net_ns_type_operations, 1522 .namespace = net_namespace, 1523 }; 1524 1525 #ifdef CONFIG_OF_NET 1526 static int of_dev_node_match(struct device *dev, const void *data) 1527 { 1528 int ret = 0; 1529 1530 if (dev->parent) 1531 ret = dev->parent->of_node == data; 1532 1533 return ret == 0 ? dev->of_node == data : ret; 1534 } 1535 1536 /* 1537 * of_find_net_device_by_node - lookup the net device for the device node 1538 * @np: OF device node 1539 * 1540 * Looks up the net_device structure corresponding with the device node. 1541 * If successful, returns a pointer to the net_device with the embedded 1542 * struct device refcount incremented by one, or NULL on failure. The 1543 * refcount must be dropped when done with the net_device. 1544 */ 1545 struct net_device *of_find_net_device_by_node(struct device_node *np) 1546 { 1547 struct device *dev; 1548 1549 dev = class_find_device(&net_class, NULL, np, of_dev_node_match); 1550 if (!dev) 1551 return NULL; 1552 1553 return to_net_dev(dev); 1554 } 1555 EXPORT_SYMBOL(of_find_net_device_by_node); 1556 #endif 1557 1558 /* Delete sysfs entries but hold kobject reference until after all 1559 * netdev references are gone. 1560 */ 1561 void netdev_unregister_kobject(struct net_device *ndev) 1562 { 1563 struct device *dev = &(ndev->dev); 1564 1565 if (!atomic_read(&dev_net(ndev)->count)) 1566 dev_set_uevent_suppress(dev, 1); 1567 1568 kobject_get(&dev->kobj); 1569 1570 remove_queue_kobjects(ndev); 1571 1572 pm_runtime_set_memalloc_noio(dev, false); 1573 1574 device_del(dev); 1575 } 1576 1577 /* Create sysfs entries for network device. */ 1578 int netdev_register_kobject(struct net_device *ndev) 1579 { 1580 struct device *dev = &(ndev->dev); 1581 const struct attribute_group **groups = ndev->sysfs_groups; 1582 int error = 0; 1583 1584 device_initialize(dev); 1585 dev->class = &net_class; 1586 dev->platform_data = ndev; 1587 dev->groups = groups; 1588 1589 dev_set_name(dev, "%s", ndev->name); 1590 1591 #ifdef CONFIG_SYSFS 1592 /* Allow for a device specific group */ 1593 if (*groups) 1594 groups++; 1595 1596 *groups++ = &netstat_group; 1597 1598 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 1599 if (ndev->ieee80211_ptr) 1600 *groups++ = &wireless_group; 1601 #if IS_ENABLED(CONFIG_WIRELESS_EXT) 1602 else if (ndev->wireless_handlers) 1603 *groups++ = &wireless_group; 1604 #endif 1605 #endif 1606 #endif /* CONFIG_SYSFS */ 1607 1608 error = device_add(dev); 1609 if (error) 1610 return error; 1611 1612 error = register_queue_kobjects(ndev); 1613 if (error) { 1614 device_del(dev); 1615 return error; 1616 } 1617 1618 pm_runtime_set_memalloc_noio(dev, true); 1619 1620 return error; 1621 } 1622 1623 int netdev_class_create_file_ns(struct class_attribute *class_attr, 1624 const void *ns) 1625 { 1626 return class_create_file_ns(&net_class, class_attr, ns); 1627 } 1628 EXPORT_SYMBOL(netdev_class_create_file_ns); 1629 1630 void netdev_class_remove_file_ns(struct class_attribute *class_attr, 1631 const void *ns) 1632 { 1633 class_remove_file_ns(&net_class, class_attr, ns); 1634 } 1635 EXPORT_SYMBOL(netdev_class_remove_file_ns); 1636 1637 int __init netdev_kobject_init(void) 1638 { 1639 kobj_ns_type_register(&net_ns_type_operations); 1640 return class_register(&net_class); 1641 } 1642