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