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 #include <linux/cpu.h> 30 31 #include "net-sysfs.h" 32 33 #ifdef CONFIG_SYSFS 34 static const char fmt_hex[] = "%#x\n"; 35 static const char fmt_dec[] = "%d\n"; 36 static const char fmt_ulong[] = "%lu\n"; 37 static const char fmt_u64[] = "%llu\n"; 38 39 static inline int dev_isalive(const struct net_device *dev) 40 { 41 return dev->reg_state <= NETREG_REGISTERED; 42 } 43 44 /* use same locking rules as GIF* ioctl's */ 45 static ssize_t netdev_show(const struct device *dev, 46 struct device_attribute *attr, char *buf, 47 ssize_t (*format)(const struct net_device *, char *)) 48 { 49 struct net_device *ndev = to_net_dev(dev); 50 ssize_t ret = -EINVAL; 51 52 read_lock(&dev_base_lock); 53 if (dev_isalive(ndev)) 54 ret = (*format)(ndev, buf); 55 read_unlock(&dev_base_lock); 56 57 return ret; 58 } 59 60 /* generate a show function for simple field */ 61 #define NETDEVICE_SHOW(field, format_string) \ 62 static ssize_t format_##field(const struct net_device *dev, char *buf) \ 63 { \ 64 return sprintf(buf, format_string, dev->field); \ 65 } \ 66 static ssize_t field##_show(struct device *dev, \ 67 struct device_attribute *attr, char *buf) \ 68 { \ 69 return netdev_show(dev, attr, buf, format_##field); \ 70 } \ 71 72 #define NETDEVICE_SHOW_RO(field, format_string) \ 73 NETDEVICE_SHOW(field, format_string); \ 74 static DEVICE_ATTR_RO(field) 75 76 #define NETDEVICE_SHOW_RW(field, format_string) \ 77 NETDEVICE_SHOW(field, format_string); \ 78 static DEVICE_ATTR_RW(field) 79 80 /* use same locking and permission rules as SIF* ioctl's */ 81 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, 82 const char *buf, size_t len, 83 int (*set)(struct net_device *, unsigned long)) 84 { 85 struct net_device *netdev = to_net_dev(dev); 86 struct net *net = dev_net(netdev); 87 unsigned long new; 88 int ret = -EINVAL; 89 90 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 91 return -EPERM; 92 93 ret = kstrtoul(buf, 0, &new); 94 if (ret) 95 goto err; 96 97 if (!rtnl_trylock()) 98 return restart_syscall(); 99 100 if (dev_isalive(netdev)) { 101 ret = (*set)(netdev, new); 102 if (ret == 0) 103 ret = len; 104 } 105 rtnl_unlock(); 106 err: 107 return ret; 108 } 109 110 NETDEVICE_SHOW_RO(dev_id, fmt_hex); 111 NETDEVICE_SHOW_RO(dev_port, fmt_dec); 112 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec); 113 NETDEVICE_SHOW_RO(addr_len, fmt_dec); 114 NETDEVICE_SHOW_RO(ifindex, fmt_dec); 115 NETDEVICE_SHOW_RO(type, fmt_dec); 116 NETDEVICE_SHOW_RO(link_mode, fmt_dec); 117 118 static ssize_t iflink_show(struct device *dev, struct device_attribute *attr, 119 char *buf) 120 { 121 struct net_device *ndev = to_net_dev(dev); 122 123 return sprintf(buf, fmt_dec, dev_get_iflink(ndev)); 124 } 125 static DEVICE_ATTR_RO(iflink); 126 127 static ssize_t format_name_assign_type(const struct net_device *dev, char *buf) 128 { 129 return sprintf(buf, fmt_dec, dev->name_assign_type); 130 } 131 132 static ssize_t name_assign_type_show(struct device *dev, 133 struct device_attribute *attr, 134 char *buf) 135 { 136 struct net_device *ndev = to_net_dev(dev); 137 ssize_t ret = -EINVAL; 138 139 if (ndev->name_assign_type != NET_NAME_UNKNOWN) 140 ret = netdev_show(dev, attr, buf, format_name_assign_type); 141 142 return ret; 143 } 144 static DEVICE_ATTR_RO(name_assign_type); 145 146 /* use same locking rules as GIFHWADDR ioctl's */ 147 static ssize_t address_show(struct device *dev, struct device_attribute *attr, 148 char *buf) 149 { 150 struct net_device *ndev = to_net_dev(dev); 151 ssize_t ret = -EINVAL; 152 153 read_lock(&dev_base_lock); 154 if (dev_isalive(ndev)) 155 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len); 156 read_unlock(&dev_base_lock); 157 return ret; 158 } 159 static DEVICE_ATTR_RO(address); 160 161 static ssize_t broadcast_show(struct device *dev, 162 struct device_attribute *attr, char *buf) 163 { 164 struct net_device *ndev = to_net_dev(dev); 165 166 if (dev_isalive(ndev)) 167 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len); 168 return -EINVAL; 169 } 170 static DEVICE_ATTR_RO(broadcast); 171 172 static int change_carrier(struct net_device *dev, unsigned long new_carrier) 173 { 174 if (!netif_running(dev)) 175 return -EINVAL; 176 return dev_change_carrier(dev, (bool)new_carrier); 177 } 178 179 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr, 180 const char *buf, size_t len) 181 { 182 return netdev_store(dev, attr, buf, len, change_carrier); 183 } 184 185 static ssize_t carrier_show(struct device *dev, 186 struct device_attribute *attr, char *buf) 187 { 188 struct net_device *netdev = to_net_dev(dev); 189 190 if (netif_running(netdev)) 191 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); 192 193 return -EINVAL; 194 } 195 static DEVICE_ATTR_RW(carrier); 196 197 static ssize_t speed_show(struct device *dev, 198 struct device_attribute *attr, char *buf) 199 { 200 struct net_device *netdev = to_net_dev(dev); 201 int ret = -EINVAL; 202 203 if (!rtnl_trylock()) 204 return restart_syscall(); 205 206 if (netif_running(netdev)) { 207 struct ethtool_link_ksettings cmd; 208 209 if (!__ethtool_get_link_ksettings(netdev, &cmd)) 210 ret = sprintf(buf, fmt_dec, cmd.base.speed); 211 } 212 rtnl_unlock(); 213 return ret; 214 } 215 static DEVICE_ATTR_RO(speed); 216 217 static ssize_t duplex_show(struct device *dev, 218 struct device_attribute *attr, char *buf) 219 { 220 struct net_device *netdev = to_net_dev(dev); 221 int ret = -EINVAL; 222 223 if (!rtnl_trylock()) 224 return restart_syscall(); 225 226 if (netif_running(netdev)) { 227 struct ethtool_link_ksettings cmd; 228 229 if (!__ethtool_get_link_ksettings(netdev, &cmd)) { 230 const char *duplex; 231 232 switch (cmd.base.duplex) { 233 case DUPLEX_HALF: 234 duplex = "half"; 235 break; 236 case DUPLEX_FULL: 237 duplex = "full"; 238 break; 239 default: 240 duplex = "unknown"; 241 break; 242 } 243 ret = sprintf(buf, "%s\n", duplex); 244 } 245 } 246 rtnl_unlock(); 247 return ret; 248 } 249 static DEVICE_ATTR_RO(duplex); 250 251 static ssize_t dormant_show(struct device *dev, 252 struct device_attribute *attr, char *buf) 253 { 254 struct net_device *netdev = to_net_dev(dev); 255 256 if (netif_running(netdev)) 257 return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); 258 259 return -EINVAL; 260 } 261 static DEVICE_ATTR_RO(dormant); 262 263 static const char *const operstates[] = { 264 "unknown", 265 "notpresent", /* currently unused */ 266 "down", 267 "lowerlayerdown", 268 "testing", /* currently unused */ 269 "dormant", 270 "up" 271 }; 272 273 static ssize_t operstate_show(struct device *dev, 274 struct device_attribute *attr, char *buf) 275 { 276 const struct net_device *netdev = to_net_dev(dev); 277 unsigned char operstate; 278 279 read_lock(&dev_base_lock); 280 operstate = netdev->operstate; 281 if (!netif_running(netdev)) 282 operstate = IF_OPER_DOWN; 283 read_unlock(&dev_base_lock); 284 285 if (operstate >= ARRAY_SIZE(operstates)) 286 return -EINVAL; /* should not happen */ 287 288 return sprintf(buf, "%s\n", operstates[operstate]); 289 } 290 static DEVICE_ATTR_RO(operstate); 291 292 static ssize_t carrier_changes_show(struct device *dev, 293 struct device_attribute *attr, 294 char *buf) 295 { 296 struct net_device *netdev = to_net_dev(dev); 297 298 return sprintf(buf, fmt_dec, 299 atomic_read(&netdev->carrier_up_count) + 300 atomic_read(&netdev->carrier_down_count)); 301 } 302 static DEVICE_ATTR_RO(carrier_changes); 303 304 static ssize_t carrier_up_count_show(struct device *dev, 305 struct device_attribute *attr, 306 char *buf) 307 { 308 struct net_device *netdev = to_net_dev(dev); 309 310 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count)); 311 } 312 static DEVICE_ATTR_RO(carrier_up_count); 313 314 static ssize_t carrier_down_count_show(struct device *dev, 315 struct device_attribute *attr, 316 char *buf) 317 { 318 struct net_device *netdev = to_net_dev(dev); 319 320 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count)); 321 } 322 static DEVICE_ATTR_RO(carrier_down_count); 323 324 /* read-write attributes */ 325 326 static int change_mtu(struct net_device *dev, unsigned long new_mtu) 327 { 328 return dev_set_mtu(dev, (int)new_mtu); 329 } 330 331 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr, 332 const char *buf, size_t len) 333 { 334 return netdev_store(dev, attr, buf, len, change_mtu); 335 } 336 NETDEVICE_SHOW_RW(mtu, fmt_dec); 337 338 static int change_flags(struct net_device *dev, unsigned long new_flags) 339 { 340 return dev_change_flags(dev, (unsigned int)new_flags); 341 } 342 343 static ssize_t flags_store(struct device *dev, struct device_attribute *attr, 344 const char *buf, size_t len) 345 { 346 return netdev_store(dev, attr, buf, len, change_flags); 347 } 348 NETDEVICE_SHOW_RW(flags, fmt_hex); 349 350 static ssize_t tx_queue_len_store(struct device *dev, 351 struct device_attribute *attr, 352 const char *buf, size_t len) 353 { 354 if (!capable(CAP_NET_ADMIN)) 355 return -EPERM; 356 357 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len); 358 } 359 NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec); 360 361 static int change_gro_flush_timeout(struct net_device *dev, unsigned long val) 362 { 363 dev->gro_flush_timeout = val; 364 return 0; 365 } 366 367 static ssize_t gro_flush_timeout_store(struct device *dev, 368 struct device_attribute *attr, 369 const char *buf, size_t len) 370 { 371 if (!capable(CAP_NET_ADMIN)) 372 return -EPERM; 373 374 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout); 375 } 376 NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong); 377 378 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr, 379 const char *buf, size_t len) 380 { 381 struct net_device *netdev = to_net_dev(dev); 382 struct net *net = dev_net(netdev); 383 size_t count = len; 384 ssize_t ret = 0; 385 386 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 387 return -EPERM; 388 389 /* ignore trailing newline */ 390 if (len > 0 && buf[len - 1] == '\n') 391 --count; 392 393 if (!rtnl_trylock()) 394 return restart_syscall(); 395 396 if (dev_isalive(netdev)) { 397 ret = dev_set_alias(netdev, buf, count); 398 if (ret < 0) 399 goto err; 400 ret = len; 401 netdev_state_change(netdev); 402 } 403 err: 404 rtnl_unlock(); 405 406 return ret; 407 } 408 409 static ssize_t ifalias_show(struct device *dev, 410 struct device_attribute *attr, char *buf) 411 { 412 const struct net_device *netdev = to_net_dev(dev); 413 char tmp[IFALIASZ]; 414 ssize_t ret = 0; 415 416 ret = dev_get_alias(netdev, tmp, sizeof(tmp)); 417 if (ret > 0) 418 ret = sprintf(buf, "%s\n", tmp); 419 return ret; 420 } 421 static DEVICE_ATTR_RW(ifalias); 422 423 static int change_group(struct net_device *dev, unsigned long new_group) 424 { 425 dev_set_group(dev, (int)new_group); 426 return 0; 427 } 428 429 static ssize_t group_store(struct device *dev, struct device_attribute *attr, 430 const char *buf, size_t len) 431 { 432 return netdev_store(dev, attr, buf, len, change_group); 433 } 434 NETDEVICE_SHOW(group, fmt_dec); 435 static DEVICE_ATTR(netdev_group, 0644, group_show, group_store); 436 437 static int change_proto_down(struct net_device *dev, unsigned long proto_down) 438 { 439 return dev_change_proto_down(dev, (bool)proto_down); 440 } 441 442 static ssize_t proto_down_store(struct device *dev, 443 struct device_attribute *attr, 444 const char *buf, size_t len) 445 { 446 return netdev_store(dev, attr, buf, len, change_proto_down); 447 } 448 NETDEVICE_SHOW_RW(proto_down, fmt_dec); 449 450 static ssize_t phys_port_id_show(struct device *dev, 451 struct device_attribute *attr, char *buf) 452 { 453 struct net_device *netdev = to_net_dev(dev); 454 ssize_t ret = -EINVAL; 455 456 if (!rtnl_trylock()) 457 return restart_syscall(); 458 459 if (dev_isalive(netdev)) { 460 struct netdev_phys_item_id ppid; 461 462 ret = dev_get_phys_port_id(netdev, &ppid); 463 if (!ret) 464 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); 465 } 466 rtnl_unlock(); 467 468 return ret; 469 } 470 static DEVICE_ATTR_RO(phys_port_id); 471 472 static ssize_t phys_port_name_show(struct device *dev, 473 struct device_attribute *attr, char *buf) 474 { 475 struct net_device *netdev = to_net_dev(dev); 476 ssize_t ret = -EINVAL; 477 478 if (!rtnl_trylock()) 479 return restart_syscall(); 480 481 if (dev_isalive(netdev)) { 482 char name[IFNAMSIZ]; 483 484 ret = dev_get_phys_port_name(netdev, name, sizeof(name)); 485 if (!ret) 486 ret = sprintf(buf, "%s\n", name); 487 } 488 rtnl_unlock(); 489 490 return ret; 491 } 492 static DEVICE_ATTR_RO(phys_port_name); 493 494 static ssize_t phys_switch_id_show(struct device *dev, 495 struct device_attribute *attr, char *buf) 496 { 497 struct net_device *netdev = to_net_dev(dev); 498 ssize_t ret = -EINVAL; 499 500 if (!rtnl_trylock()) 501 return restart_syscall(); 502 503 if (dev_isalive(netdev)) { 504 struct switchdev_attr attr = { 505 .orig_dev = netdev, 506 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, 507 .flags = SWITCHDEV_F_NO_RECURSE, 508 }; 509 510 ret = switchdev_port_attr_get(netdev, &attr); 511 if (!ret) 512 ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len, 513 attr.u.ppid.id); 514 } 515 rtnl_unlock(); 516 517 return ret; 518 } 519 static DEVICE_ATTR_RO(phys_switch_id); 520 521 static struct attribute *net_class_attrs[] __ro_after_init = { 522 &dev_attr_netdev_group.attr, 523 &dev_attr_type.attr, 524 &dev_attr_dev_id.attr, 525 &dev_attr_dev_port.attr, 526 &dev_attr_iflink.attr, 527 &dev_attr_ifindex.attr, 528 &dev_attr_name_assign_type.attr, 529 &dev_attr_addr_assign_type.attr, 530 &dev_attr_addr_len.attr, 531 &dev_attr_link_mode.attr, 532 &dev_attr_address.attr, 533 &dev_attr_broadcast.attr, 534 &dev_attr_speed.attr, 535 &dev_attr_duplex.attr, 536 &dev_attr_dormant.attr, 537 &dev_attr_operstate.attr, 538 &dev_attr_carrier_changes.attr, 539 &dev_attr_ifalias.attr, 540 &dev_attr_carrier.attr, 541 &dev_attr_mtu.attr, 542 &dev_attr_flags.attr, 543 &dev_attr_tx_queue_len.attr, 544 &dev_attr_gro_flush_timeout.attr, 545 &dev_attr_phys_port_id.attr, 546 &dev_attr_phys_port_name.attr, 547 &dev_attr_phys_switch_id.attr, 548 &dev_attr_proto_down.attr, 549 &dev_attr_carrier_up_count.attr, 550 &dev_attr_carrier_down_count.attr, 551 NULL, 552 }; 553 ATTRIBUTE_GROUPS(net_class); 554 555 /* Show a given an attribute in the statistics group */ 556 static ssize_t netstat_show(const struct device *d, 557 struct device_attribute *attr, char *buf, 558 unsigned long offset) 559 { 560 struct net_device *dev = to_net_dev(d); 561 ssize_t ret = -EINVAL; 562 563 WARN_ON(offset > sizeof(struct rtnl_link_stats64) || 564 offset % sizeof(u64) != 0); 565 566 read_lock(&dev_base_lock); 567 if (dev_isalive(dev)) { 568 struct rtnl_link_stats64 temp; 569 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 570 571 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset)); 572 } 573 read_unlock(&dev_base_lock); 574 return ret; 575 } 576 577 /* generate a read-only statistics attribute */ 578 #define NETSTAT_ENTRY(name) \ 579 static ssize_t name##_show(struct device *d, \ 580 struct device_attribute *attr, char *buf) \ 581 { \ 582 return netstat_show(d, attr, buf, \ 583 offsetof(struct rtnl_link_stats64, name)); \ 584 } \ 585 static DEVICE_ATTR_RO(name) 586 587 NETSTAT_ENTRY(rx_packets); 588 NETSTAT_ENTRY(tx_packets); 589 NETSTAT_ENTRY(rx_bytes); 590 NETSTAT_ENTRY(tx_bytes); 591 NETSTAT_ENTRY(rx_errors); 592 NETSTAT_ENTRY(tx_errors); 593 NETSTAT_ENTRY(rx_dropped); 594 NETSTAT_ENTRY(tx_dropped); 595 NETSTAT_ENTRY(multicast); 596 NETSTAT_ENTRY(collisions); 597 NETSTAT_ENTRY(rx_length_errors); 598 NETSTAT_ENTRY(rx_over_errors); 599 NETSTAT_ENTRY(rx_crc_errors); 600 NETSTAT_ENTRY(rx_frame_errors); 601 NETSTAT_ENTRY(rx_fifo_errors); 602 NETSTAT_ENTRY(rx_missed_errors); 603 NETSTAT_ENTRY(tx_aborted_errors); 604 NETSTAT_ENTRY(tx_carrier_errors); 605 NETSTAT_ENTRY(tx_fifo_errors); 606 NETSTAT_ENTRY(tx_heartbeat_errors); 607 NETSTAT_ENTRY(tx_window_errors); 608 NETSTAT_ENTRY(rx_compressed); 609 NETSTAT_ENTRY(tx_compressed); 610 NETSTAT_ENTRY(rx_nohandler); 611 612 static struct attribute *netstat_attrs[] __ro_after_init = { 613 &dev_attr_rx_packets.attr, 614 &dev_attr_tx_packets.attr, 615 &dev_attr_rx_bytes.attr, 616 &dev_attr_tx_bytes.attr, 617 &dev_attr_rx_errors.attr, 618 &dev_attr_tx_errors.attr, 619 &dev_attr_rx_dropped.attr, 620 &dev_attr_tx_dropped.attr, 621 &dev_attr_multicast.attr, 622 &dev_attr_collisions.attr, 623 &dev_attr_rx_length_errors.attr, 624 &dev_attr_rx_over_errors.attr, 625 &dev_attr_rx_crc_errors.attr, 626 &dev_attr_rx_frame_errors.attr, 627 &dev_attr_rx_fifo_errors.attr, 628 &dev_attr_rx_missed_errors.attr, 629 &dev_attr_tx_aborted_errors.attr, 630 &dev_attr_tx_carrier_errors.attr, 631 &dev_attr_tx_fifo_errors.attr, 632 &dev_attr_tx_heartbeat_errors.attr, 633 &dev_attr_tx_window_errors.attr, 634 &dev_attr_rx_compressed.attr, 635 &dev_attr_tx_compressed.attr, 636 &dev_attr_rx_nohandler.attr, 637 NULL 638 }; 639 640 static const struct attribute_group netstat_group = { 641 .name = "statistics", 642 .attrs = netstat_attrs, 643 }; 644 645 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 646 static struct attribute *wireless_attrs[] = { 647 NULL 648 }; 649 650 static const struct attribute_group wireless_group = { 651 .name = "wireless", 652 .attrs = wireless_attrs, 653 }; 654 #endif 655 656 #else /* CONFIG_SYSFS */ 657 #define net_class_groups NULL 658 #endif /* CONFIG_SYSFS */ 659 660 #ifdef CONFIG_SYSFS 661 #define to_rx_queue_attr(_attr) \ 662 container_of(_attr, struct rx_queue_attribute, attr) 663 664 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 665 666 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 667 char *buf) 668 { 669 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 670 struct netdev_rx_queue *queue = to_rx_queue(kobj); 671 672 if (!attribute->show) 673 return -EIO; 674 675 return attribute->show(queue, buf); 676 } 677 678 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 679 const char *buf, size_t count) 680 { 681 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 682 struct netdev_rx_queue *queue = to_rx_queue(kobj); 683 684 if (!attribute->store) 685 return -EIO; 686 687 return attribute->store(queue, buf, count); 688 } 689 690 static const struct sysfs_ops rx_queue_sysfs_ops = { 691 .show = rx_queue_attr_show, 692 .store = rx_queue_attr_store, 693 }; 694 695 #ifdef CONFIG_RPS 696 static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf) 697 { 698 struct rps_map *map; 699 cpumask_var_t mask; 700 int i, len; 701 702 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 703 return -ENOMEM; 704 705 rcu_read_lock(); 706 map = rcu_dereference(queue->rps_map); 707 if (map) 708 for (i = 0; i < map->len; i++) 709 cpumask_set_cpu(map->cpus[i], mask); 710 711 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 712 rcu_read_unlock(); 713 free_cpumask_var(mask); 714 715 return len < PAGE_SIZE ? len : -EINVAL; 716 } 717 718 static ssize_t store_rps_map(struct netdev_rx_queue *queue, 719 const char *buf, size_t len) 720 { 721 struct rps_map *old_map, *map; 722 cpumask_var_t mask; 723 int err, cpu, i; 724 static DEFINE_MUTEX(rps_map_mutex); 725 726 if (!capable(CAP_NET_ADMIN)) 727 return -EPERM; 728 729 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 730 return -ENOMEM; 731 732 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 733 if (err) { 734 free_cpumask_var(mask); 735 return err; 736 } 737 738 map = kzalloc(max_t(unsigned int, 739 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 740 GFP_KERNEL); 741 if (!map) { 742 free_cpumask_var(mask); 743 return -ENOMEM; 744 } 745 746 i = 0; 747 for_each_cpu_and(cpu, mask, cpu_online_mask) 748 map->cpus[i++] = cpu; 749 750 if (i) { 751 map->len = i; 752 } else { 753 kfree(map); 754 map = NULL; 755 } 756 757 mutex_lock(&rps_map_mutex); 758 old_map = rcu_dereference_protected(queue->rps_map, 759 mutex_is_locked(&rps_map_mutex)); 760 rcu_assign_pointer(queue->rps_map, map); 761 762 if (map) 763 static_key_slow_inc(&rps_needed); 764 if (old_map) 765 static_key_slow_dec(&rps_needed); 766 767 mutex_unlock(&rps_map_mutex); 768 769 if (old_map) 770 kfree_rcu(old_map, rcu); 771 772 free_cpumask_var(mask); 773 return len; 774 } 775 776 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 777 char *buf) 778 { 779 struct rps_dev_flow_table *flow_table; 780 unsigned long val = 0; 781 782 rcu_read_lock(); 783 flow_table = rcu_dereference(queue->rps_flow_table); 784 if (flow_table) 785 val = (unsigned long)flow_table->mask + 1; 786 rcu_read_unlock(); 787 788 return sprintf(buf, "%lu\n", val); 789 } 790 791 static void rps_dev_flow_table_release(struct rcu_head *rcu) 792 { 793 struct rps_dev_flow_table *table = container_of(rcu, 794 struct rps_dev_flow_table, rcu); 795 vfree(table); 796 } 797 798 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 799 const char *buf, size_t len) 800 { 801 unsigned long mask, count; 802 struct rps_dev_flow_table *table, *old_table; 803 static DEFINE_SPINLOCK(rps_dev_flow_lock); 804 int rc; 805 806 if (!capable(CAP_NET_ADMIN)) 807 return -EPERM; 808 809 rc = kstrtoul(buf, 0, &count); 810 if (rc < 0) 811 return rc; 812 813 if (count) { 814 mask = count - 1; 815 /* mask = roundup_pow_of_two(count) - 1; 816 * without overflows... 817 */ 818 while ((mask | (mask >> 1)) != mask) 819 mask |= (mask >> 1); 820 /* On 64 bit arches, must check mask fits in table->mask (u32), 821 * and on 32bit arches, must check 822 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow. 823 */ 824 #if BITS_PER_LONG > 32 825 if (mask > (unsigned long)(u32)mask) 826 return -EINVAL; 827 #else 828 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) 829 / sizeof(struct rps_dev_flow)) { 830 /* Enforce a limit to prevent overflow */ 831 return -EINVAL; 832 } 833 #endif 834 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); 835 if (!table) 836 return -ENOMEM; 837 838 table->mask = mask; 839 for (count = 0; count <= mask; count++) 840 table->flows[count].cpu = RPS_NO_CPU; 841 } else { 842 table = NULL; 843 } 844 845 spin_lock(&rps_dev_flow_lock); 846 old_table = rcu_dereference_protected(queue->rps_flow_table, 847 lockdep_is_held(&rps_dev_flow_lock)); 848 rcu_assign_pointer(queue->rps_flow_table, table); 849 spin_unlock(&rps_dev_flow_lock); 850 851 if (old_table) 852 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 853 854 return len; 855 } 856 857 static struct rx_queue_attribute rps_cpus_attribute __ro_after_init 858 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map); 859 860 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init 861 = __ATTR(rps_flow_cnt, 0644, 862 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 863 #endif /* CONFIG_RPS */ 864 865 static struct attribute *rx_queue_default_attrs[] __ro_after_init = { 866 #ifdef CONFIG_RPS 867 &rps_cpus_attribute.attr, 868 &rps_dev_flow_table_cnt_attribute.attr, 869 #endif 870 NULL 871 }; 872 873 static void rx_queue_release(struct kobject *kobj) 874 { 875 struct netdev_rx_queue *queue = to_rx_queue(kobj); 876 #ifdef CONFIG_RPS 877 struct rps_map *map; 878 struct rps_dev_flow_table *flow_table; 879 880 map = rcu_dereference_protected(queue->rps_map, 1); 881 if (map) { 882 RCU_INIT_POINTER(queue->rps_map, NULL); 883 kfree_rcu(map, rcu); 884 } 885 886 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); 887 if (flow_table) { 888 RCU_INIT_POINTER(queue->rps_flow_table, NULL); 889 call_rcu(&flow_table->rcu, rps_dev_flow_table_release); 890 } 891 #endif 892 893 memset(kobj, 0, sizeof(*kobj)); 894 dev_put(queue->dev); 895 } 896 897 static const void *rx_queue_namespace(struct kobject *kobj) 898 { 899 struct netdev_rx_queue *queue = to_rx_queue(kobj); 900 struct device *dev = &queue->dev->dev; 901 const void *ns = NULL; 902 903 if (dev->class && dev->class->ns_type) 904 ns = dev->class->namespace(dev); 905 906 return ns; 907 } 908 909 static void rx_queue_get_ownership(struct kobject *kobj, 910 kuid_t *uid, kgid_t *gid) 911 { 912 const struct net *net = rx_queue_namespace(kobj); 913 914 net_ns_get_ownership(net, uid, gid); 915 } 916 917 static struct kobj_type rx_queue_ktype __ro_after_init = { 918 .sysfs_ops = &rx_queue_sysfs_ops, 919 .release = rx_queue_release, 920 .default_attrs = rx_queue_default_attrs, 921 .namespace = rx_queue_namespace, 922 .get_ownership = rx_queue_get_ownership, 923 }; 924 925 static int rx_queue_add_kobject(struct net_device *dev, int index) 926 { 927 struct netdev_rx_queue *queue = dev->_rx + index; 928 struct kobject *kobj = &queue->kobj; 929 int error = 0; 930 931 kobj->kset = dev->queues_kset; 932 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 933 "rx-%u", index); 934 if (error) 935 return error; 936 937 if (dev->sysfs_rx_queue_group) { 938 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); 939 if (error) { 940 kobject_put(kobj); 941 return error; 942 } 943 } 944 945 kobject_uevent(kobj, KOBJ_ADD); 946 dev_hold(queue->dev); 947 948 return error; 949 } 950 #endif /* CONFIG_SYSFS */ 951 952 int 953 net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 954 { 955 #ifdef CONFIG_SYSFS 956 int i; 957 int error = 0; 958 959 #ifndef CONFIG_RPS 960 if (!dev->sysfs_rx_queue_group) 961 return 0; 962 #endif 963 for (i = old_num; i < new_num; i++) { 964 error = rx_queue_add_kobject(dev, i); 965 if (error) { 966 new_num = old_num; 967 break; 968 } 969 } 970 971 while (--i >= new_num) { 972 struct kobject *kobj = &dev->_rx[i].kobj; 973 974 if (!refcount_read(&dev_net(dev)->count)) 975 kobj->uevent_suppress = 1; 976 if (dev->sysfs_rx_queue_group) 977 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group); 978 kobject_put(kobj); 979 } 980 981 return error; 982 #else 983 return 0; 984 #endif 985 } 986 987 #ifdef CONFIG_SYSFS 988 /* 989 * netdev_queue sysfs structures and functions. 990 */ 991 struct netdev_queue_attribute { 992 struct attribute attr; 993 ssize_t (*show)(struct netdev_queue *queue, char *buf); 994 ssize_t (*store)(struct netdev_queue *queue, 995 const char *buf, size_t len); 996 }; 997 #define to_netdev_queue_attr(_attr) \ 998 container_of(_attr, struct netdev_queue_attribute, attr) 999 1000 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) 1001 1002 static ssize_t netdev_queue_attr_show(struct kobject *kobj, 1003 struct attribute *attr, char *buf) 1004 { 1005 const struct netdev_queue_attribute *attribute 1006 = to_netdev_queue_attr(attr); 1007 struct netdev_queue *queue = to_netdev_queue(kobj); 1008 1009 if (!attribute->show) 1010 return -EIO; 1011 1012 return attribute->show(queue, buf); 1013 } 1014 1015 static ssize_t netdev_queue_attr_store(struct kobject *kobj, 1016 struct attribute *attr, 1017 const char *buf, size_t count) 1018 { 1019 const struct netdev_queue_attribute *attribute 1020 = to_netdev_queue_attr(attr); 1021 struct netdev_queue *queue = to_netdev_queue(kobj); 1022 1023 if (!attribute->store) 1024 return -EIO; 1025 1026 return attribute->store(queue, buf, count); 1027 } 1028 1029 static const struct sysfs_ops netdev_queue_sysfs_ops = { 1030 .show = netdev_queue_attr_show, 1031 .store = netdev_queue_attr_store, 1032 }; 1033 1034 static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf) 1035 { 1036 unsigned long trans_timeout; 1037 1038 spin_lock_irq(&queue->_xmit_lock); 1039 trans_timeout = queue->trans_timeout; 1040 spin_unlock_irq(&queue->_xmit_lock); 1041 1042 return sprintf(buf, "%lu", trans_timeout); 1043 } 1044 1045 static unsigned int get_netdev_queue_index(struct netdev_queue *queue) 1046 { 1047 struct net_device *dev = queue->dev; 1048 unsigned int i; 1049 1050 i = queue - dev->_tx; 1051 BUG_ON(i >= dev->num_tx_queues); 1052 1053 return i; 1054 } 1055 1056 static ssize_t traffic_class_show(struct netdev_queue *queue, 1057 char *buf) 1058 { 1059 struct net_device *dev = queue->dev; 1060 int index; 1061 int tc; 1062 1063 if (!netif_is_multiqueue(dev)) 1064 return -ENOENT; 1065 1066 index = get_netdev_queue_index(queue); 1067 1068 /* If queue belongs to subordinate dev use its TC mapping */ 1069 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev; 1070 1071 tc = netdev_txq_to_tc(dev, index); 1072 if (tc < 0) 1073 return -EINVAL; 1074 1075 /* We can report the traffic class one of two ways: 1076 * Subordinate device traffic classes are reported with the traffic 1077 * class first, and then the subordinate class so for example TC0 on 1078 * subordinate device 2 will be reported as "0-2". If the queue 1079 * belongs to the root device it will be reported with just the 1080 * traffic class, so just "0" for TC 0 for example. 1081 */ 1082 return dev->num_tc < 0 ? sprintf(buf, "%u%d\n", tc, dev->num_tc) : 1083 sprintf(buf, "%u\n", tc); 1084 } 1085 1086 #ifdef CONFIG_XPS 1087 static ssize_t tx_maxrate_show(struct netdev_queue *queue, 1088 char *buf) 1089 { 1090 return sprintf(buf, "%lu\n", queue->tx_maxrate); 1091 } 1092 1093 static ssize_t tx_maxrate_store(struct netdev_queue *queue, 1094 const char *buf, size_t len) 1095 { 1096 struct net_device *dev = queue->dev; 1097 int err, index = get_netdev_queue_index(queue); 1098 u32 rate = 0; 1099 1100 if (!capable(CAP_NET_ADMIN)) 1101 return -EPERM; 1102 1103 err = kstrtou32(buf, 10, &rate); 1104 if (err < 0) 1105 return err; 1106 1107 if (!rtnl_trylock()) 1108 return restart_syscall(); 1109 1110 err = -EOPNOTSUPP; 1111 if (dev->netdev_ops->ndo_set_tx_maxrate) 1112 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate); 1113 1114 rtnl_unlock(); 1115 if (!err) { 1116 queue->tx_maxrate = rate; 1117 return len; 1118 } 1119 return err; 1120 } 1121 1122 static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init 1123 = __ATTR_RW(tx_maxrate); 1124 #endif 1125 1126 static struct netdev_queue_attribute queue_trans_timeout __ro_after_init 1127 = __ATTR_RO(tx_timeout); 1128 1129 static struct netdev_queue_attribute queue_traffic_class __ro_after_init 1130 = __ATTR_RO(traffic_class); 1131 1132 #ifdef CONFIG_BQL 1133 /* 1134 * Byte queue limits sysfs structures and functions. 1135 */ 1136 static ssize_t bql_show(char *buf, unsigned int value) 1137 { 1138 return sprintf(buf, "%u\n", value); 1139 } 1140 1141 static ssize_t bql_set(const char *buf, const size_t count, 1142 unsigned int *pvalue) 1143 { 1144 unsigned int value; 1145 int err; 1146 1147 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) { 1148 value = DQL_MAX_LIMIT; 1149 } else { 1150 err = kstrtouint(buf, 10, &value); 1151 if (err < 0) 1152 return err; 1153 if (value > DQL_MAX_LIMIT) 1154 return -EINVAL; 1155 } 1156 1157 *pvalue = value; 1158 1159 return count; 1160 } 1161 1162 static ssize_t bql_show_hold_time(struct netdev_queue *queue, 1163 char *buf) 1164 { 1165 struct dql *dql = &queue->dql; 1166 1167 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); 1168 } 1169 1170 static ssize_t bql_set_hold_time(struct netdev_queue *queue, 1171 const char *buf, size_t len) 1172 { 1173 struct dql *dql = &queue->dql; 1174 unsigned int value; 1175 int err; 1176 1177 err = kstrtouint(buf, 10, &value); 1178 if (err < 0) 1179 return err; 1180 1181 dql->slack_hold_time = msecs_to_jiffies(value); 1182 1183 return len; 1184 } 1185 1186 static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init 1187 = __ATTR(hold_time, 0644, 1188 bql_show_hold_time, bql_set_hold_time); 1189 1190 static ssize_t bql_show_inflight(struct netdev_queue *queue, 1191 char *buf) 1192 { 1193 struct dql *dql = &queue->dql; 1194 1195 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); 1196 } 1197 1198 static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init = 1199 __ATTR(inflight, 0444, bql_show_inflight, NULL); 1200 1201 #define BQL_ATTR(NAME, FIELD) \ 1202 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ 1203 char *buf) \ 1204 { \ 1205 return bql_show(buf, queue->dql.FIELD); \ 1206 } \ 1207 \ 1208 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ 1209 const char *buf, size_t len) \ 1210 { \ 1211 return bql_set(buf, len, &queue->dql.FIELD); \ 1212 } \ 1213 \ 1214 static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \ 1215 = __ATTR(NAME, 0644, \ 1216 bql_show_ ## NAME, bql_set_ ## NAME) 1217 1218 BQL_ATTR(limit, limit); 1219 BQL_ATTR(limit_max, max_limit); 1220 BQL_ATTR(limit_min, min_limit); 1221 1222 static struct attribute *dql_attrs[] __ro_after_init = { 1223 &bql_limit_attribute.attr, 1224 &bql_limit_max_attribute.attr, 1225 &bql_limit_min_attribute.attr, 1226 &bql_hold_time_attribute.attr, 1227 &bql_inflight_attribute.attr, 1228 NULL 1229 }; 1230 1231 static const struct attribute_group dql_group = { 1232 .name = "byte_queue_limits", 1233 .attrs = dql_attrs, 1234 }; 1235 #endif /* CONFIG_BQL */ 1236 1237 #ifdef CONFIG_XPS 1238 static ssize_t xps_cpus_show(struct netdev_queue *queue, 1239 char *buf) 1240 { 1241 struct net_device *dev = queue->dev; 1242 int cpu, len, num_tc = 1, tc = 0; 1243 struct xps_dev_maps *dev_maps; 1244 cpumask_var_t mask; 1245 unsigned long index; 1246 1247 if (!netif_is_multiqueue(dev)) 1248 return -ENOENT; 1249 1250 index = get_netdev_queue_index(queue); 1251 1252 if (dev->num_tc) { 1253 /* Do not allow XPS on subordinate device directly */ 1254 num_tc = dev->num_tc; 1255 if (num_tc < 0) 1256 return -EINVAL; 1257 1258 /* If queue belongs to subordinate dev use its map */ 1259 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev; 1260 1261 tc = netdev_txq_to_tc(dev, index); 1262 if (tc < 0) 1263 return -EINVAL; 1264 } 1265 1266 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 1267 return -ENOMEM; 1268 1269 rcu_read_lock(); 1270 dev_maps = rcu_dereference(dev->xps_cpus_map); 1271 if (dev_maps) { 1272 for_each_possible_cpu(cpu) { 1273 int i, tci = cpu * num_tc + tc; 1274 struct xps_map *map; 1275 1276 map = rcu_dereference(dev_maps->attr_map[tci]); 1277 if (!map) 1278 continue; 1279 1280 for (i = map->len; i--;) { 1281 if (map->queues[i] == index) { 1282 cpumask_set_cpu(cpu, mask); 1283 break; 1284 } 1285 } 1286 } 1287 } 1288 rcu_read_unlock(); 1289 1290 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 1291 free_cpumask_var(mask); 1292 return len < PAGE_SIZE ? len : -EINVAL; 1293 } 1294 1295 static ssize_t xps_cpus_store(struct netdev_queue *queue, 1296 const char *buf, size_t len) 1297 { 1298 struct net_device *dev = queue->dev; 1299 unsigned long index; 1300 cpumask_var_t mask; 1301 int err; 1302 1303 if (!netif_is_multiqueue(dev)) 1304 return -ENOENT; 1305 1306 if (!capable(CAP_NET_ADMIN)) 1307 return -EPERM; 1308 1309 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 1310 return -ENOMEM; 1311 1312 index = get_netdev_queue_index(queue); 1313 1314 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 1315 if (err) { 1316 free_cpumask_var(mask); 1317 return err; 1318 } 1319 1320 err = netif_set_xps_queue(dev, mask, index); 1321 1322 free_cpumask_var(mask); 1323 1324 return err ? : len; 1325 } 1326 1327 static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init 1328 = __ATTR_RW(xps_cpus); 1329 1330 static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf) 1331 { 1332 struct net_device *dev = queue->dev; 1333 struct xps_dev_maps *dev_maps; 1334 unsigned long *mask, index; 1335 int j, len, num_tc = 1, tc = 0; 1336 1337 index = get_netdev_queue_index(queue); 1338 1339 if (dev->num_tc) { 1340 num_tc = dev->num_tc; 1341 tc = netdev_txq_to_tc(dev, index); 1342 if (tc < 0) 1343 return -EINVAL; 1344 } 1345 mask = kcalloc(BITS_TO_LONGS(dev->num_rx_queues), sizeof(long), 1346 GFP_KERNEL); 1347 if (!mask) 1348 return -ENOMEM; 1349 1350 rcu_read_lock(); 1351 dev_maps = rcu_dereference(dev->xps_rxqs_map); 1352 if (!dev_maps) 1353 goto out_no_maps; 1354 1355 for (j = -1; j = netif_attrmask_next(j, NULL, dev->num_rx_queues), 1356 j < dev->num_rx_queues;) { 1357 int i, tci = j * num_tc + tc; 1358 struct xps_map *map; 1359 1360 map = rcu_dereference(dev_maps->attr_map[tci]); 1361 if (!map) 1362 continue; 1363 1364 for (i = map->len; i--;) { 1365 if (map->queues[i] == index) { 1366 set_bit(j, mask); 1367 break; 1368 } 1369 } 1370 } 1371 out_no_maps: 1372 rcu_read_unlock(); 1373 1374 len = bitmap_print_to_pagebuf(false, buf, mask, dev->num_rx_queues); 1375 kfree(mask); 1376 1377 return len < PAGE_SIZE ? len : -EINVAL; 1378 } 1379 1380 static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf, 1381 size_t len) 1382 { 1383 struct net_device *dev = queue->dev; 1384 struct net *net = dev_net(dev); 1385 unsigned long *mask, index; 1386 int err; 1387 1388 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1389 return -EPERM; 1390 1391 mask = kcalloc(BITS_TO_LONGS(dev->num_rx_queues), sizeof(long), 1392 GFP_KERNEL); 1393 if (!mask) 1394 return -ENOMEM; 1395 1396 index = get_netdev_queue_index(queue); 1397 1398 err = bitmap_parse(buf, len, mask, dev->num_rx_queues); 1399 if (err) { 1400 kfree(mask); 1401 return err; 1402 } 1403 1404 cpus_read_lock(); 1405 err = __netif_set_xps_queue(dev, mask, index, true); 1406 cpus_read_unlock(); 1407 1408 kfree(mask); 1409 return err ? : len; 1410 } 1411 1412 static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init 1413 = __ATTR_RW(xps_rxqs); 1414 #endif /* CONFIG_XPS */ 1415 1416 static struct attribute *netdev_queue_default_attrs[] __ro_after_init = { 1417 &queue_trans_timeout.attr, 1418 &queue_traffic_class.attr, 1419 #ifdef CONFIG_XPS 1420 &xps_cpus_attribute.attr, 1421 &xps_rxqs_attribute.attr, 1422 &queue_tx_maxrate.attr, 1423 #endif 1424 NULL 1425 }; 1426 1427 static void netdev_queue_release(struct kobject *kobj) 1428 { 1429 struct netdev_queue *queue = to_netdev_queue(kobj); 1430 1431 memset(kobj, 0, sizeof(*kobj)); 1432 dev_put(queue->dev); 1433 } 1434 1435 static const void *netdev_queue_namespace(struct kobject *kobj) 1436 { 1437 struct netdev_queue *queue = to_netdev_queue(kobj); 1438 struct device *dev = &queue->dev->dev; 1439 const void *ns = NULL; 1440 1441 if (dev->class && dev->class->ns_type) 1442 ns = dev->class->namespace(dev); 1443 1444 return ns; 1445 } 1446 1447 static void netdev_queue_get_ownership(struct kobject *kobj, 1448 kuid_t *uid, kgid_t *gid) 1449 { 1450 const struct net *net = netdev_queue_namespace(kobj); 1451 1452 net_ns_get_ownership(net, uid, gid); 1453 } 1454 1455 static struct kobj_type netdev_queue_ktype __ro_after_init = { 1456 .sysfs_ops = &netdev_queue_sysfs_ops, 1457 .release = netdev_queue_release, 1458 .default_attrs = netdev_queue_default_attrs, 1459 .namespace = netdev_queue_namespace, 1460 .get_ownership = netdev_queue_get_ownership, 1461 }; 1462 1463 static int netdev_queue_add_kobject(struct net_device *dev, int index) 1464 { 1465 struct netdev_queue *queue = dev->_tx + index; 1466 struct kobject *kobj = &queue->kobj; 1467 int error = 0; 1468 1469 kobj->kset = dev->queues_kset; 1470 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, 1471 "tx-%u", index); 1472 if (error) 1473 return error; 1474 1475 #ifdef CONFIG_BQL 1476 error = sysfs_create_group(kobj, &dql_group); 1477 if (error) { 1478 kobject_put(kobj); 1479 return error; 1480 } 1481 #endif 1482 1483 kobject_uevent(kobj, KOBJ_ADD); 1484 dev_hold(queue->dev); 1485 1486 return 0; 1487 } 1488 #endif /* CONFIG_SYSFS */ 1489 1490 int 1491 netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 1492 { 1493 #ifdef CONFIG_SYSFS 1494 int i; 1495 int error = 0; 1496 1497 for (i = old_num; i < new_num; i++) { 1498 error = netdev_queue_add_kobject(dev, i); 1499 if (error) { 1500 new_num = old_num; 1501 break; 1502 } 1503 } 1504 1505 while (--i >= new_num) { 1506 struct netdev_queue *queue = dev->_tx + i; 1507 1508 if (!refcount_read(&dev_net(dev)->count)) 1509 queue->kobj.uevent_suppress = 1; 1510 #ifdef CONFIG_BQL 1511 sysfs_remove_group(&queue->kobj, &dql_group); 1512 #endif 1513 kobject_put(&queue->kobj); 1514 } 1515 1516 return error; 1517 #else 1518 return 0; 1519 #endif /* CONFIG_SYSFS */ 1520 } 1521 1522 static int register_queue_kobjects(struct net_device *dev) 1523 { 1524 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; 1525 1526 #ifdef CONFIG_SYSFS 1527 dev->queues_kset = kset_create_and_add("queues", 1528 NULL, &dev->dev.kobj); 1529 if (!dev->queues_kset) 1530 return -ENOMEM; 1531 real_rx = dev->real_num_rx_queues; 1532 #endif 1533 real_tx = dev->real_num_tx_queues; 1534 1535 error = net_rx_queue_update_kobjects(dev, 0, real_rx); 1536 if (error) 1537 goto error; 1538 rxq = real_rx; 1539 1540 error = netdev_queue_update_kobjects(dev, 0, real_tx); 1541 if (error) 1542 goto error; 1543 txq = real_tx; 1544 1545 return 0; 1546 1547 error: 1548 netdev_queue_update_kobjects(dev, txq, 0); 1549 net_rx_queue_update_kobjects(dev, rxq, 0); 1550 return error; 1551 } 1552 1553 static void remove_queue_kobjects(struct net_device *dev) 1554 { 1555 int real_rx = 0, real_tx = 0; 1556 1557 #ifdef CONFIG_SYSFS 1558 real_rx = dev->real_num_rx_queues; 1559 #endif 1560 real_tx = dev->real_num_tx_queues; 1561 1562 net_rx_queue_update_kobjects(dev, real_rx, 0); 1563 netdev_queue_update_kobjects(dev, real_tx, 0); 1564 #ifdef CONFIG_SYSFS 1565 kset_unregister(dev->queues_kset); 1566 #endif 1567 } 1568 1569 static bool net_current_may_mount(void) 1570 { 1571 struct net *net = current->nsproxy->net_ns; 1572 1573 return ns_capable(net->user_ns, CAP_SYS_ADMIN); 1574 } 1575 1576 static void *net_grab_current_ns(void) 1577 { 1578 struct net *ns = current->nsproxy->net_ns; 1579 #ifdef CONFIG_NET_NS 1580 if (ns) 1581 refcount_inc(&ns->passive); 1582 #endif 1583 return ns; 1584 } 1585 1586 static const void *net_initial_ns(void) 1587 { 1588 return &init_net; 1589 } 1590 1591 static const void *net_netlink_ns(struct sock *sk) 1592 { 1593 return sock_net(sk); 1594 } 1595 1596 const struct kobj_ns_type_operations net_ns_type_operations = { 1597 .type = KOBJ_NS_TYPE_NET, 1598 .current_may_mount = net_current_may_mount, 1599 .grab_current_ns = net_grab_current_ns, 1600 .netlink_ns = net_netlink_ns, 1601 .initial_ns = net_initial_ns, 1602 .drop_ns = net_drop_ns, 1603 }; 1604 EXPORT_SYMBOL_GPL(net_ns_type_operations); 1605 1606 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 1607 { 1608 struct net_device *dev = to_net_dev(d); 1609 int retval; 1610 1611 /* pass interface to uevent. */ 1612 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 1613 if (retval) 1614 goto exit; 1615 1616 /* pass ifindex to uevent. 1617 * ifindex is useful as it won't change (interface name may change) 1618 * and is what RtNetlink uses natively. 1619 */ 1620 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 1621 1622 exit: 1623 return retval; 1624 } 1625 1626 /* 1627 * netdev_release -- destroy and free a dead device. 1628 * Called when last reference to device kobject is gone. 1629 */ 1630 static void netdev_release(struct device *d) 1631 { 1632 struct net_device *dev = to_net_dev(d); 1633 1634 BUG_ON(dev->reg_state != NETREG_RELEASED); 1635 1636 /* no need to wait for rcu grace period: 1637 * device is dead and about to be freed. 1638 */ 1639 kfree(rcu_access_pointer(dev->ifalias)); 1640 netdev_freemem(dev); 1641 } 1642 1643 static const void *net_namespace(struct device *d) 1644 { 1645 struct net_device *dev = to_net_dev(d); 1646 1647 return dev_net(dev); 1648 } 1649 1650 static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid) 1651 { 1652 struct net_device *dev = to_net_dev(d); 1653 const struct net *net = dev_net(dev); 1654 1655 net_ns_get_ownership(net, uid, gid); 1656 } 1657 1658 static struct class net_class __ro_after_init = { 1659 .name = "net", 1660 .dev_release = netdev_release, 1661 .dev_groups = net_class_groups, 1662 .dev_uevent = netdev_uevent, 1663 .ns_type = &net_ns_type_operations, 1664 .namespace = net_namespace, 1665 .get_ownership = net_get_ownership, 1666 }; 1667 1668 #ifdef CONFIG_OF_NET 1669 static int of_dev_node_match(struct device *dev, const void *data) 1670 { 1671 int ret = 0; 1672 1673 if (dev->parent) 1674 ret = dev->parent->of_node == data; 1675 1676 return ret == 0 ? dev->of_node == data : ret; 1677 } 1678 1679 /* 1680 * of_find_net_device_by_node - lookup the net device for the device node 1681 * @np: OF device node 1682 * 1683 * Looks up the net_device structure corresponding with the device node. 1684 * If successful, returns a pointer to the net_device with the embedded 1685 * struct device refcount incremented by one, or NULL on failure. The 1686 * refcount must be dropped when done with the net_device. 1687 */ 1688 struct net_device *of_find_net_device_by_node(struct device_node *np) 1689 { 1690 struct device *dev; 1691 1692 dev = class_find_device(&net_class, NULL, np, of_dev_node_match); 1693 if (!dev) 1694 return NULL; 1695 1696 return to_net_dev(dev); 1697 } 1698 EXPORT_SYMBOL(of_find_net_device_by_node); 1699 #endif 1700 1701 /* Delete sysfs entries but hold kobject reference until after all 1702 * netdev references are gone. 1703 */ 1704 void netdev_unregister_kobject(struct net_device *ndev) 1705 { 1706 struct device *dev = &ndev->dev; 1707 1708 if (!refcount_read(&dev_net(ndev)->count)) 1709 dev_set_uevent_suppress(dev, 1); 1710 1711 kobject_get(&dev->kobj); 1712 1713 remove_queue_kobjects(ndev); 1714 1715 pm_runtime_set_memalloc_noio(dev, false); 1716 1717 device_del(dev); 1718 } 1719 1720 /* Create sysfs entries for network device. */ 1721 int netdev_register_kobject(struct net_device *ndev) 1722 { 1723 struct device *dev = &ndev->dev; 1724 const struct attribute_group **groups = ndev->sysfs_groups; 1725 int error = 0; 1726 1727 device_initialize(dev); 1728 dev->class = &net_class; 1729 dev->platform_data = ndev; 1730 dev->groups = groups; 1731 1732 dev_set_name(dev, "%s", ndev->name); 1733 1734 #ifdef CONFIG_SYSFS 1735 /* Allow for a device specific group */ 1736 if (*groups) 1737 groups++; 1738 1739 *groups++ = &netstat_group; 1740 1741 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 1742 if (ndev->ieee80211_ptr) 1743 *groups++ = &wireless_group; 1744 #if IS_ENABLED(CONFIG_WIRELESS_EXT) 1745 else if (ndev->wireless_handlers) 1746 *groups++ = &wireless_group; 1747 #endif 1748 #endif 1749 #endif /* CONFIG_SYSFS */ 1750 1751 error = device_add(dev); 1752 if (error) 1753 return error; 1754 1755 error = register_queue_kobjects(ndev); 1756 if (error) { 1757 device_del(dev); 1758 return error; 1759 } 1760 1761 pm_runtime_set_memalloc_noio(dev, true); 1762 1763 return error; 1764 } 1765 1766 int netdev_class_create_file_ns(const struct class_attribute *class_attr, 1767 const void *ns) 1768 { 1769 return class_create_file_ns(&net_class, class_attr, ns); 1770 } 1771 EXPORT_SYMBOL(netdev_class_create_file_ns); 1772 1773 void netdev_class_remove_file_ns(const struct class_attribute *class_attr, 1774 const void *ns) 1775 { 1776 class_remove_file_ns(&net_class, class_attr, ns); 1777 } 1778 EXPORT_SYMBOL(netdev_class_remove_file_ns); 1779 1780 int __init netdev_kobject_init(void) 1781 { 1782 kobj_ns_type_register(&net_ns_type_operations); 1783 return class_register(&net_class); 1784 } 1785