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 <linux/if_arp.h> 16 #include <linux/slab.h> 17 #include <linux/nsproxy.h> 18 #include <net/sock.h> 19 #include <net/net_namespace.h> 20 #include <linux/rtnetlink.h> 21 #include <linux/vmalloc.h> 22 #include <linux/export.h> 23 #include <linux/jiffies.h> 24 #include <linux/pm_runtime.h> 25 26 #include "net-sysfs.h" 27 28 #ifdef CONFIG_SYSFS 29 static const char fmt_hex[] = "%#x\n"; 30 static const char fmt_long_hex[] = "%#lx\n"; 31 static const char fmt_dec[] = "%d\n"; 32 static const char fmt_udec[] = "%u\n"; 33 static const char fmt_ulong[] = "%lu\n"; 34 static const char fmt_u64[] = "%llu\n"; 35 36 static inline int dev_isalive(const struct net_device *dev) 37 { 38 return dev->reg_state <= NETREG_REGISTERED; 39 } 40 41 /* use same locking rules as GIF* ioctl's */ 42 static ssize_t netdev_show(const struct device *dev, 43 struct device_attribute *attr, char *buf, 44 ssize_t (*format)(const struct net_device *, char *)) 45 { 46 struct net_device *net = to_net_dev(dev); 47 ssize_t ret = -EINVAL; 48 49 read_lock(&dev_base_lock); 50 if (dev_isalive(net)) 51 ret = (*format)(net, buf); 52 read_unlock(&dev_base_lock); 53 54 return ret; 55 } 56 57 /* generate a show function for simple field */ 58 #define NETDEVICE_SHOW(field, format_string) \ 59 static ssize_t format_##field(const struct net_device *net, char *buf) \ 60 { \ 61 return sprintf(buf, format_string, net->field); \ 62 } \ 63 static ssize_t field##_show(struct device *dev, \ 64 struct device_attribute *attr, char *buf) \ 65 { \ 66 return netdev_show(dev, attr, buf, format_##field); \ 67 } \ 68 69 #define NETDEVICE_SHOW_RO(field, format_string) \ 70 NETDEVICE_SHOW(field, format_string); \ 71 static DEVICE_ATTR_RO(field) 72 73 #define NETDEVICE_SHOW_RW(field, format_string) \ 74 NETDEVICE_SHOW(field, format_string); \ 75 static DEVICE_ATTR_RW(field) 76 77 /* use same locking and permission rules as SIF* ioctl's */ 78 static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, 79 const char *buf, size_t len, 80 int (*set)(struct net_device *, unsigned long)) 81 { 82 struct net_device *netdev = to_net_dev(dev); 83 struct net *net = dev_net(netdev); 84 unsigned long new; 85 int ret = -EINVAL; 86 87 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 88 return -EPERM; 89 90 ret = kstrtoul(buf, 0, &new); 91 if (ret) 92 goto err; 93 94 if (!rtnl_trylock()) 95 return restart_syscall(); 96 97 if (dev_isalive(netdev)) { 98 if ((ret = (*set)(netdev, new)) == 0) 99 ret = len; 100 } 101 rtnl_unlock(); 102 err: 103 return ret; 104 } 105 106 NETDEVICE_SHOW_RO(dev_id, fmt_hex); 107 NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec); 108 NETDEVICE_SHOW_RO(addr_len, fmt_dec); 109 NETDEVICE_SHOW_RO(iflink, fmt_dec); 110 NETDEVICE_SHOW_RO(ifindex, fmt_dec); 111 NETDEVICE_SHOW_RO(type, fmt_dec); 112 NETDEVICE_SHOW_RO(link_mode, fmt_dec); 113 114 /* use same locking rules as GIFHWADDR ioctl's */ 115 static ssize_t address_show(struct device *dev, struct device_attribute *attr, 116 char *buf) 117 { 118 struct net_device *net = to_net_dev(dev); 119 ssize_t ret = -EINVAL; 120 121 read_lock(&dev_base_lock); 122 if (dev_isalive(net)) 123 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len); 124 read_unlock(&dev_base_lock); 125 return ret; 126 } 127 static DEVICE_ATTR_RO(address); 128 129 static ssize_t broadcast_show(struct device *dev, 130 struct device_attribute *attr, char *buf) 131 { 132 struct net_device *net = to_net_dev(dev); 133 if (dev_isalive(net)) 134 return sysfs_format_mac(buf, net->broadcast, net->addr_len); 135 return -EINVAL; 136 } 137 static DEVICE_ATTR_RO(broadcast); 138 139 static int change_carrier(struct net_device *net, unsigned long new_carrier) 140 { 141 if (!netif_running(net)) 142 return -EINVAL; 143 return dev_change_carrier(net, (bool) new_carrier); 144 } 145 146 static ssize_t carrier_store(struct device *dev, struct device_attribute *attr, 147 const char *buf, size_t len) 148 { 149 return netdev_store(dev, attr, buf, len, change_carrier); 150 } 151 152 static ssize_t carrier_show(struct device *dev, 153 struct device_attribute *attr, char *buf) 154 { 155 struct net_device *netdev = to_net_dev(dev); 156 if (netif_running(netdev)) { 157 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); 158 } 159 return -EINVAL; 160 } 161 static DEVICE_ATTR_RW(carrier); 162 163 static ssize_t speed_show(struct device *dev, 164 struct device_attribute *attr, char *buf) 165 { 166 struct net_device *netdev = to_net_dev(dev); 167 int ret = -EINVAL; 168 169 if (!rtnl_trylock()) 170 return restart_syscall(); 171 172 if (netif_running(netdev)) { 173 struct ethtool_cmd cmd; 174 if (!__ethtool_get_settings(netdev, &cmd)) 175 ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd)); 176 } 177 rtnl_unlock(); 178 return ret; 179 } 180 static DEVICE_ATTR_RO(speed); 181 182 static ssize_t duplex_show(struct device *dev, 183 struct device_attribute *attr, char *buf) 184 { 185 struct net_device *netdev = to_net_dev(dev); 186 int ret = -EINVAL; 187 188 if (!rtnl_trylock()) 189 return restart_syscall(); 190 191 if (netif_running(netdev)) { 192 struct ethtool_cmd cmd; 193 if (!__ethtool_get_settings(netdev, &cmd)) { 194 const char *duplex; 195 switch (cmd.duplex) { 196 case DUPLEX_HALF: 197 duplex = "half"; 198 break; 199 case DUPLEX_FULL: 200 duplex = "full"; 201 break; 202 default: 203 duplex = "unknown"; 204 break; 205 } 206 ret = sprintf(buf, "%s\n", duplex); 207 } 208 } 209 rtnl_unlock(); 210 return ret; 211 } 212 static DEVICE_ATTR_RO(duplex); 213 214 static ssize_t dormant_show(struct device *dev, 215 struct device_attribute *attr, char *buf) 216 { 217 struct net_device *netdev = to_net_dev(dev); 218 219 if (netif_running(netdev)) 220 return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); 221 222 return -EINVAL; 223 } 224 static DEVICE_ATTR_RO(dormant); 225 226 static const char *const operstates[] = { 227 "unknown", 228 "notpresent", /* currently unused */ 229 "down", 230 "lowerlayerdown", 231 "testing", /* currently unused */ 232 "dormant", 233 "up" 234 }; 235 236 static ssize_t operstate_show(struct device *dev, 237 struct device_attribute *attr, char *buf) 238 { 239 const struct net_device *netdev = to_net_dev(dev); 240 unsigned char operstate; 241 242 read_lock(&dev_base_lock); 243 operstate = netdev->operstate; 244 if (!netif_running(netdev)) 245 operstate = IF_OPER_DOWN; 246 read_unlock(&dev_base_lock); 247 248 if (operstate >= ARRAY_SIZE(operstates)) 249 return -EINVAL; /* should not happen */ 250 251 return sprintf(buf, "%s\n", operstates[operstate]); 252 } 253 static DEVICE_ATTR_RO(operstate); 254 255 /* read-write attributes */ 256 257 static int change_mtu(struct net_device *net, unsigned long new_mtu) 258 { 259 return dev_set_mtu(net, (int) new_mtu); 260 } 261 262 static ssize_t mtu_store(struct device *dev, struct device_attribute *attr, 263 const char *buf, size_t len) 264 { 265 return netdev_store(dev, attr, buf, len, change_mtu); 266 } 267 NETDEVICE_SHOW_RW(mtu, fmt_dec); 268 269 static int change_flags(struct net_device *net, unsigned long new_flags) 270 { 271 return dev_change_flags(net, (unsigned int) new_flags); 272 } 273 274 static ssize_t flags_store(struct device *dev, struct device_attribute *attr, 275 const char *buf, size_t len) 276 { 277 return netdev_store(dev, attr, buf, len, change_flags); 278 } 279 NETDEVICE_SHOW_RW(flags, fmt_hex); 280 281 static int change_tx_queue_len(struct net_device *net, unsigned long new_len) 282 { 283 net->tx_queue_len = new_len; 284 return 0; 285 } 286 287 static ssize_t tx_queue_len_store(struct device *dev, 288 struct device_attribute *attr, 289 const char *buf, size_t len) 290 { 291 if (!capable(CAP_NET_ADMIN)) 292 return -EPERM; 293 294 return netdev_store(dev, attr, buf, len, change_tx_queue_len); 295 } 296 NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong); 297 298 static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr, 299 const char *buf, size_t len) 300 { 301 struct net_device *netdev = to_net_dev(dev); 302 struct net *net = dev_net(netdev); 303 size_t count = len; 304 ssize_t ret; 305 306 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 307 return -EPERM; 308 309 /* ignore trailing newline */ 310 if (len > 0 && buf[len - 1] == '\n') 311 --count; 312 313 if (!rtnl_trylock()) 314 return restart_syscall(); 315 ret = dev_set_alias(netdev, buf, count); 316 rtnl_unlock(); 317 318 return ret < 0 ? ret : len; 319 } 320 321 static ssize_t ifalias_show(struct device *dev, 322 struct device_attribute *attr, char *buf) 323 { 324 const struct net_device *netdev = to_net_dev(dev); 325 ssize_t ret = 0; 326 327 if (!rtnl_trylock()) 328 return restart_syscall(); 329 if (netdev->ifalias) 330 ret = sprintf(buf, "%s\n", netdev->ifalias); 331 rtnl_unlock(); 332 return ret; 333 } 334 static DEVICE_ATTR_RW(ifalias); 335 336 static int change_group(struct net_device *net, unsigned long new_group) 337 { 338 dev_set_group(net, (int) new_group); 339 return 0; 340 } 341 342 static ssize_t group_store(struct device *dev, struct device_attribute *attr, 343 const char *buf, size_t len) 344 { 345 return netdev_store(dev, attr, buf, len, change_group); 346 } 347 NETDEVICE_SHOW(group, fmt_dec); 348 static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store); 349 350 static ssize_t phys_port_id_show(struct device *dev, 351 struct device_attribute *attr, char *buf) 352 { 353 struct net_device *netdev = to_net_dev(dev); 354 ssize_t ret = -EINVAL; 355 356 if (!rtnl_trylock()) 357 return restart_syscall(); 358 359 if (dev_isalive(netdev)) { 360 struct netdev_phys_port_id ppid; 361 362 ret = dev_get_phys_port_id(netdev, &ppid); 363 if (!ret) 364 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); 365 } 366 rtnl_unlock(); 367 368 return ret; 369 } 370 static DEVICE_ATTR_RO(phys_port_id); 371 372 static struct attribute *net_class_attrs[] = { 373 &dev_attr_netdev_group.attr, 374 &dev_attr_type.attr, 375 &dev_attr_dev_id.attr, 376 &dev_attr_iflink.attr, 377 &dev_attr_ifindex.attr, 378 &dev_attr_addr_assign_type.attr, 379 &dev_attr_addr_len.attr, 380 &dev_attr_link_mode.attr, 381 &dev_attr_address.attr, 382 &dev_attr_broadcast.attr, 383 &dev_attr_speed.attr, 384 &dev_attr_duplex.attr, 385 &dev_attr_dormant.attr, 386 &dev_attr_operstate.attr, 387 &dev_attr_ifalias.attr, 388 &dev_attr_carrier.attr, 389 &dev_attr_mtu.attr, 390 &dev_attr_flags.attr, 391 &dev_attr_tx_queue_len.attr, 392 &dev_attr_phys_port_id.attr, 393 NULL, 394 }; 395 ATTRIBUTE_GROUPS(net_class); 396 397 /* Show a given an attribute in the statistics group */ 398 static ssize_t netstat_show(const struct device *d, 399 struct device_attribute *attr, char *buf, 400 unsigned long offset) 401 { 402 struct net_device *dev = to_net_dev(d); 403 ssize_t ret = -EINVAL; 404 405 WARN_ON(offset > sizeof(struct rtnl_link_stats64) || 406 offset % sizeof(u64) != 0); 407 408 read_lock(&dev_base_lock); 409 if (dev_isalive(dev)) { 410 struct rtnl_link_stats64 temp; 411 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 412 413 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset)); 414 } 415 read_unlock(&dev_base_lock); 416 return ret; 417 } 418 419 /* generate a read-only statistics attribute */ 420 #define NETSTAT_ENTRY(name) \ 421 static ssize_t name##_show(struct device *d, \ 422 struct device_attribute *attr, char *buf) \ 423 { \ 424 return netstat_show(d, attr, buf, \ 425 offsetof(struct rtnl_link_stats64, name)); \ 426 } \ 427 static DEVICE_ATTR_RO(name) 428 429 NETSTAT_ENTRY(rx_packets); 430 NETSTAT_ENTRY(tx_packets); 431 NETSTAT_ENTRY(rx_bytes); 432 NETSTAT_ENTRY(tx_bytes); 433 NETSTAT_ENTRY(rx_errors); 434 NETSTAT_ENTRY(tx_errors); 435 NETSTAT_ENTRY(rx_dropped); 436 NETSTAT_ENTRY(tx_dropped); 437 NETSTAT_ENTRY(multicast); 438 NETSTAT_ENTRY(collisions); 439 NETSTAT_ENTRY(rx_length_errors); 440 NETSTAT_ENTRY(rx_over_errors); 441 NETSTAT_ENTRY(rx_crc_errors); 442 NETSTAT_ENTRY(rx_frame_errors); 443 NETSTAT_ENTRY(rx_fifo_errors); 444 NETSTAT_ENTRY(rx_missed_errors); 445 NETSTAT_ENTRY(tx_aborted_errors); 446 NETSTAT_ENTRY(tx_carrier_errors); 447 NETSTAT_ENTRY(tx_fifo_errors); 448 NETSTAT_ENTRY(tx_heartbeat_errors); 449 NETSTAT_ENTRY(tx_window_errors); 450 NETSTAT_ENTRY(rx_compressed); 451 NETSTAT_ENTRY(tx_compressed); 452 453 static struct attribute *netstat_attrs[] = { 454 &dev_attr_rx_packets.attr, 455 &dev_attr_tx_packets.attr, 456 &dev_attr_rx_bytes.attr, 457 &dev_attr_tx_bytes.attr, 458 &dev_attr_rx_errors.attr, 459 &dev_attr_tx_errors.attr, 460 &dev_attr_rx_dropped.attr, 461 &dev_attr_tx_dropped.attr, 462 &dev_attr_multicast.attr, 463 &dev_attr_collisions.attr, 464 &dev_attr_rx_length_errors.attr, 465 &dev_attr_rx_over_errors.attr, 466 &dev_attr_rx_crc_errors.attr, 467 &dev_attr_rx_frame_errors.attr, 468 &dev_attr_rx_fifo_errors.attr, 469 &dev_attr_rx_missed_errors.attr, 470 &dev_attr_tx_aborted_errors.attr, 471 &dev_attr_tx_carrier_errors.attr, 472 &dev_attr_tx_fifo_errors.attr, 473 &dev_attr_tx_heartbeat_errors.attr, 474 &dev_attr_tx_window_errors.attr, 475 &dev_attr_rx_compressed.attr, 476 &dev_attr_tx_compressed.attr, 477 NULL 478 }; 479 480 481 static struct attribute_group netstat_group = { 482 .name = "statistics", 483 .attrs = netstat_attrs, 484 }; 485 486 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 487 static struct attribute *wireless_attrs[] = { 488 NULL 489 }; 490 491 static struct attribute_group wireless_group = { 492 .name = "wireless", 493 .attrs = wireless_attrs, 494 }; 495 #endif 496 497 #else /* CONFIG_SYSFS */ 498 #define net_class_groups NULL 499 #endif /* CONFIG_SYSFS */ 500 501 #ifdef CONFIG_RPS 502 /* 503 * RX queue sysfs structures and functions. 504 */ 505 struct rx_queue_attribute { 506 struct attribute attr; 507 ssize_t (*show)(struct netdev_rx_queue *queue, 508 struct rx_queue_attribute *attr, char *buf); 509 ssize_t (*store)(struct netdev_rx_queue *queue, 510 struct rx_queue_attribute *attr, const char *buf, size_t len); 511 }; 512 #define to_rx_queue_attr(_attr) container_of(_attr, \ 513 struct rx_queue_attribute, attr) 514 515 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 516 517 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 518 char *buf) 519 { 520 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 521 struct netdev_rx_queue *queue = to_rx_queue(kobj); 522 523 if (!attribute->show) 524 return -EIO; 525 526 return attribute->show(queue, attribute, buf); 527 } 528 529 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 530 const char *buf, size_t count) 531 { 532 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 533 struct netdev_rx_queue *queue = to_rx_queue(kobj); 534 535 if (!attribute->store) 536 return -EIO; 537 538 return attribute->store(queue, attribute, buf, count); 539 } 540 541 static const struct sysfs_ops rx_queue_sysfs_ops = { 542 .show = rx_queue_attr_show, 543 .store = rx_queue_attr_store, 544 }; 545 546 static ssize_t show_rps_map(struct netdev_rx_queue *queue, 547 struct rx_queue_attribute *attribute, char *buf) 548 { 549 struct rps_map *map; 550 cpumask_var_t mask; 551 size_t len = 0; 552 int i; 553 554 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 555 return -ENOMEM; 556 557 rcu_read_lock(); 558 map = rcu_dereference(queue->rps_map); 559 if (map) 560 for (i = 0; i < map->len; i++) 561 cpumask_set_cpu(map->cpus[i], mask); 562 563 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask); 564 if (PAGE_SIZE - len < 3) { 565 rcu_read_unlock(); 566 free_cpumask_var(mask); 567 return -EINVAL; 568 } 569 rcu_read_unlock(); 570 571 free_cpumask_var(mask); 572 len += sprintf(buf + len, "\n"); 573 return len; 574 } 575 576 static ssize_t store_rps_map(struct netdev_rx_queue *queue, 577 struct rx_queue_attribute *attribute, 578 const char *buf, size_t len) 579 { 580 struct rps_map *old_map, *map; 581 cpumask_var_t mask; 582 int err, cpu, i; 583 static DEFINE_SPINLOCK(rps_map_lock); 584 585 if (!capable(CAP_NET_ADMIN)) 586 return -EPERM; 587 588 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 589 return -ENOMEM; 590 591 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 592 if (err) { 593 free_cpumask_var(mask); 594 return err; 595 } 596 597 map = kzalloc(max_t(unsigned int, 598 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 599 GFP_KERNEL); 600 if (!map) { 601 free_cpumask_var(mask); 602 return -ENOMEM; 603 } 604 605 i = 0; 606 for_each_cpu_and(cpu, mask, cpu_online_mask) 607 map->cpus[i++] = cpu; 608 609 if (i) 610 map->len = i; 611 else { 612 kfree(map); 613 map = NULL; 614 } 615 616 spin_lock(&rps_map_lock); 617 old_map = rcu_dereference_protected(queue->rps_map, 618 lockdep_is_held(&rps_map_lock)); 619 rcu_assign_pointer(queue->rps_map, map); 620 spin_unlock(&rps_map_lock); 621 622 if (map) 623 static_key_slow_inc(&rps_needed); 624 if (old_map) { 625 kfree_rcu(old_map, rcu); 626 static_key_slow_dec(&rps_needed); 627 } 628 free_cpumask_var(mask); 629 return len; 630 } 631 632 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 633 struct rx_queue_attribute *attr, 634 char *buf) 635 { 636 struct rps_dev_flow_table *flow_table; 637 unsigned long val = 0; 638 639 rcu_read_lock(); 640 flow_table = rcu_dereference(queue->rps_flow_table); 641 if (flow_table) 642 val = (unsigned long)flow_table->mask + 1; 643 rcu_read_unlock(); 644 645 return sprintf(buf, "%lu\n", val); 646 } 647 648 static void rps_dev_flow_table_release(struct rcu_head *rcu) 649 { 650 struct rps_dev_flow_table *table = container_of(rcu, 651 struct rps_dev_flow_table, rcu); 652 vfree(table); 653 } 654 655 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 656 struct rx_queue_attribute *attr, 657 const char *buf, size_t len) 658 { 659 unsigned long mask, count; 660 struct rps_dev_flow_table *table, *old_table; 661 static DEFINE_SPINLOCK(rps_dev_flow_lock); 662 int rc; 663 664 if (!capable(CAP_NET_ADMIN)) 665 return -EPERM; 666 667 rc = kstrtoul(buf, 0, &count); 668 if (rc < 0) 669 return rc; 670 671 if (count) { 672 mask = count - 1; 673 /* mask = roundup_pow_of_two(count) - 1; 674 * without overflows... 675 */ 676 while ((mask | (mask >> 1)) != mask) 677 mask |= (mask >> 1); 678 /* On 64 bit arches, must check mask fits in table->mask (u32), 679 * and on 32bit arches, must check RPS_DEV_FLOW_TABLE_SIZE(mask + 1) 680 * doesnt overflow. 681 */ 682 #if BITS_PER_LONG > 32 683 if (mask > (unsigned long)(u32)mask) 684 return -EINVAL; 685 #else 686 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) 687 / sizeof(struct rps_dev_flow)) { 688 /* Enforce a limit to prevent overflow */ 689 return -EINVAL; 690 } 691 #endif 692 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); 693 if (!table) 694 return -ENOMEM; 695 696 table->mask = mask; 697 for (count = 0; count <= mask; count++) 698 table->flows[count].cpu = RPS_NO_CPU; 699 } else 700 table = NULL; 701 702 spin_lock(&rps_dev_flow_lock); 703 old_table = rcu_dereference_protected(queue->rps_flow_table, 704 lockdep_is_held(&rps_dev_flow_lock)); 705 rcu_assign_pointer(queue->rps_flow_table, table); 706 spin_unlock(&rps_dev_flow_lock); 707 708 if (old_table) 709 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 710 711 return len; 712 } 713 714 static struct rx_queue_attribute rps_cpus_attribute = 715 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); 716 717 718 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = 719 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, 720 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 721 722 static struct attribute *rx_queue_default_attrs[] = { 723 &rps_cpus_attribute.attr, 724 &rps_dev_flow_table_cnt_attribute.attr, 725 NULL 726 }; 727 728 static void rx_queue_release(struct kobject *kobj) 729 { 730 struct netdev_rx_queue *queue = to_rx_queue(kobj); 731 struct rps_map *map; 732 struct rps_dev_flow_table *flow_table; 733 734 735 map = rcu_dereference_protected(queue->rps_map, 1); 736 if (map) { 737 RCU_INIT_POINTER(queue->rps_map, NULL); 738 kfree_rcu(map, rcu); 739 } 740 741 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); 742 if (flow_table) { 743 RCU_INIT_POINTER(queue->rps_flow_table, NULL); 744 call_rcu(&flow_table->rcu, rps_dev_flow_table_release); 745 } 746 747 memset(kobj, 0, sizeof(*kobj)); 748 dev_put(queue->dev); 749 } 750 751 static struct kobj_type rx_queue_ktype = { 752 .sysfs_ops = &rx_queue_sysfs_ops, 753 .release = rx_queue_release, 754 .default_attrs = rx_queue_default_attrs, 755 }; 756 757 static int rx_queue_add_kobject(struct net_device *net, int index) 758 { 759 struct netdev_rx_queue *queue = net->_rx + index; 760 struct kobject *kobj = &queue->kobj; 761 int error = 0; 762 763 kobj->kset = net->queues_kset; 764 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 765 "rx-%u", index); 766 if (error) { 767 kobject_put(kobj); 768 return error; 769 } 770 771 kobject_uevent(kobj, KOBJ_ADD); 772 dev_hold(queue->dev); 773 774 return error; 775 } 776 #endif /* CONFIG_RPS */ 777 778 int 779 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num) 780 { 781 #ifdef CONFIG_RPS 782 int i; 783 int error = 0; 784 785 for (i = old_num; i < new_num; i++) { 786 error = rx_queue_add_kobject(net, i); 787 if (error) { 788 new_num = old_num; 789 break; 790 } 791 } 792 793 while (--i >= new_num) 794 kobject_put(&net->_rx[i].kobj); 795 796 return error; 797 #else 798 return 0; 799 #endif 800 } 801 802 #ifdef CONFIG_SYSFS 803 /* 804 * netdev_queue sysfs structures and functions. 805 */ 806 struct netdev_queue_attribute { 807 struct attribute attr; 808 ssize_t (*show)(struct netdev_queue *queue, 809 struct netdev_queue_attribute *attr, char *buf); 810 ssize_t (*store)(struct netdev_queue *queue, 811 struct netdev_queue_attribute *attr, const char *buf, size_t len); 812 }; 813 #define to_netdev_queue_attr(_attr) container_of(_attr, \ 814 struct netdev_queue_attribute, attr) 815 816 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) 817 818 static ssize_t netdev_queue_attr_show(struct kobject *kobj, 819 struct attribute *attr, char *buf) 820 { 821 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 822 struct netdev_queue *queue = to_netdev_queue(kobj); 823 824 if (!attribute->show) 825 return -EIO; 826 827 return attribute->show(queue, attribute, buf); 828 } 829 830 static ssize_t netdev_queue_attr_store(struct kobject *kobj, 831 struct attribute *attr, 832 const char *buf, size_t count) 833 { 834 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 835 struct netdev_queue *queue = to_netdev_queue(kobj); 836 837 if (!attribute->store) 838 return -EIO; 839 840 return attribute->store(queue, attribute, buf, count); 841 } 842 843 static const struct sysfs_ops netdev_queue_sysfs_ops = { 844 .show = netdev_queue_attr_show, 845 .store = netdev_queue_attr_store, 846 }; 847 848 static ssize_t show_trans_timeout(struct netdev_queue *queue, 849 struct netdev_queue_attribute *attribute, 850 char *buf) 851 { 852 unsigned long trans_timeout; 853 854 spin_lock_irq(&queue->_xmit_lock); 855 trans_timeout = queue->trans_timeout; 856 spin_unlock_irq(&queue->_xmit_lock); 857 858 return sprintf(buf, "%lu", trans_timeout); 859 } 860 861 static struct netdev_queue_attribute queue_trans_timeout = 862 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL); 863 864 #ifdef CONFIG_BQL 865 /* 866 * Byte queue limits sysfs structures and functions. 867 */ 868 static ssize_t bql_show(char *buf, unsigned int value) 869 { 870 return sprintf(buf, "%u\n", value); 871 } 872 873 static ssize_t bql_set(const char *buf, const size_t count, 874 unsigned int *pvalue) 875 { 876 unsigned int value; 877 int err; 878 879 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) 880 value = DQL_MAX_LIMIT; 881 else { 882 err = kstrtouint(buf, 10, &value); 883 if (err < 0) 884 return err; 885 if (value > DQL_MAX_LIMIT) 886 return -EINVAL; 887 } 888 889 *pvalue = value; 890 891 return count; 892 } 893 894 static ssize_t bql_show_hold_time(struct netdev_queue *queue, 895 struct netdev_queue_attribute *attr, 896 char *buf) 897 { 898 struct dql *dql = &queue->dql; 899 900 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); 901 } 902 903 static ssize_t bql_set_hold_time(struct netdev_queue *queue, 904 struct netdev_queue_attribute *attribute, 905 const char *buf, size_t len) 906 { 907 struct dql *dql = &queue->dql; 908 unsigned int value; 909 int err; 910 911 err = kstrtouint(buf, 10, &value); 912 if (err < 0) 913 return err; 914 915 dql->slack_hold_time = msecs_to_jiffies(value); 916 917 return len; 918 } 919 920 static struct netdev_queue_attribute bql_hold_time_attribute = 921 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time, 922 bql_set_hold_time); 923 924 static ssize_t bql_show_inflight(struct netdev_queue *queue, 925 struct netdev_queue_attribute *attr, 926 char *buf) 927 { 928 struct dql *dql = &queue->dql; 929 930 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); 931 } 932 933 static struct netdev_queue_attribute bql_inflight_attribute = 934 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL); 935 936 #define BQL_ATTR(NAME, FIELD) \ 937 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ 938 struct netdev_queue_attribute *attr, \ 939 char *buf) \ 940 { \ 941 return bql_show(buf, queue->dql.FIELD); \ 942 } \ 943 \ 944 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ 945 struct netdev_queue_attribute *attr, \ 946 const char *buf, size_t len) \ 947 { \ 948 return bql_set(buf, len, &queue->dql.FIELD); \ 949 } \ 950 \ 951 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \ 952 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \ 953 bql_set_ ## NAME); 954 955 BQL_ATTR(limit, limit) 956 BQL_ATTR(limit_max, max_limit) 957 BQL_ATTR(limit_min, min_limit) 958 959 static struct attribute *dql_attrs[] = { 960 &bql_limit_attribute.attr, 961 &bql_limit_max_attribute.attr, 962 &bql_limit_min_attribute.attr, 963 &bql_hold_time_attribute.attr, 964 &bql_inflight_attribute.attr, 965 NULL 966 }; 967 968 static struct attribute_group dql_group = { 969 .name = "byte_queue_limits", 970 .attrs = dql_attrs, 971 }; 972 #endif /* CONFIG_BQL */ 973 974 #ifdef CONFIG_XPS 975 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue) 976 { 977 struct net_device *dev = queue->dev; 978 int i; 979 980 for (i = 0; i < dev->num_tx_queues; i++) 981 if (queue == &dev->_tx[i]) 982 break; 983 984 BUG_ON(i >= dev->num_tx_queues); 985 986 return i; 987 } 988 989 990 static ssize_t show_xps_map(struct netdev_queue *queue, 991 struct netdev_queue_attribute *attribute, char *buf) 992 { 993 struct net_device *dev = queue->dev; 994 struct xps_dev_maps *dev_maps; 995 cpumask_var_t mask; 996 unsigned long index; 997 size_t len = 0; 998 int i; 999 1000 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 1001 return -ENOMEM; 1002 1003 index = get_netdev_queue_index(queue); 1004 1005 rcu_read_lock(); 1006 dev_maps = rcu_dereference(dev->xps_maps); 1007 if (dev_maps) { 1008 for_each_possible_cpu(i) { 1009 struct xps_map *map = 1010 rcu_dereference(dev_maps->cpu_map[i]); 1011 if (map) { 1012 int j; 1013 for (j = 0; j < map->len; j++) { 1014 if (map->queues[j] == index) { 1015 cpumask_set_cpu(i, mask); 1016 break; 1017 } 1018 } 1019 } 1020 } 1021 } 1022 rcu_read_unlock(); 1023 1024 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask); 1025 if (PAGE_SIZE - len < 3) { 1026 free_cpumask_var(mask); 1027 return -EINVAL; 1028 } 1029 1030 free_cpumask_var(mask); 1031 len += sprintf(buf + len, "\n"); 1032 return len; 1033 } 1034 1035 static ssize_t store_xps_map(struct netdev_queue *queue, 1036 struct netdev_queue_attribute *attribute, 1037 const char *buf, size_t len) 1038 { 1039 struct net_device *dev = queue->dev; 1040 unsigned long index; 1041 cpumask_var_t mask; 1042 int err; 1043 1044 if (!capable(CAP_NET_ADMIN)) 1045 return -EPERM; 1046 1047 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 1048 return -ENOMEM; 1049 1050 index = get_netdev_queue_index(queue); 1051 1052 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 1053 if (err) { 1054 free_cpumask_var(mask); 1055 return err; 1056 } 1057 1058 err = netif_set_xps_queue(dev, mask, index); 1059 1060 free_cpumask_var(mask); 1061 1062 return err ? : len; 1063 } 1064 1065 static struct netdev_queue_attribute xps_cpus_attribute = 1066 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map); 1067 #endif /* CONFIG_XPS */ 1068 1069 static struct attribute *netdev_queue_default_attrs[] = { 1070 &queue_trans_timeout.attr, 1071 #ifdef CONFIG_XPS 1072 &xps_cpus_attribute.attr, 1073 #endif 1074 NULL 1075 }; 1076 1077 static void netdev_queue_release(struct kobject *kobj) 1078 { 1079 struct netdev_queue *queue = to_netdev_queue(kobj); 1080 1081 memset(kobj, 0, sizeof(*kobj)); 1082 dev_put(queue->dev); 1083 } 1084 1085 static struct kobj_type netdev_queue_ktype = { 1086 .sysfs_ops = &netdev_queue_sysfs_ops, 1087 .release = netdev_queue_release, 1088 .default_attrs = netdev_queue_default_attrs, 1089 }; 1090 1091 static int netdev_queue_add_kobject(struct net_device *net, int index) 1092 { 1093 struct netdev_queue *queue = net->_tx + index; 1094 struct kobject *kobj = &queue->kobj; 1095 int error = 0; 1096 1097 kobj->kset = net->queues_kset; 1098 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, 1099 "tx-%u", index); 1100 if (error) 1101 goto exit; 1102 1103 #ifdef CONFIG_BQL 1104 error = sysfs_create_group(kobj, &dql_group); 1105 if (error) 1106 goto exit; 1107 #endif 1108 1109 kobject_uevent(kobj, KOBJ_ADD); 1110 dev_hold(queue->dev); 1111 1112 return 0; 1113 exit: 1114 kobject_put(kobj); 1115 return error; 1116 } 1117 #endif /* CONFIG_SYSFS */ 1118 1119 int 1120 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num) 1121 { 1122 #ifdef CONFIG_SYSFS 1123 int i; 1124 int error = 0; 1125 1126 for (i = old_num; i < new_num; i++) { 1127 error = netdev_queue_add_kobject(net, i); 1128 if (error) { 1129 new_num = old_num; 1130 break; 1131 } 1132 } 1133 1134 while (--i >= new_num) { 1135 struct netdev_queue *queue = net->_tx + i; 1136 1137 #ifdef CONFIG_BQL 1138 sysfs_remove_group(&queue->kobj, &dql_group); 1139 #endif 1140 kobject_put(&queue->kobj); 1141 } 1142 1143 return error; 1144 #else 1145 return 0; 1146 #endif /* CONFIG_SYSFS */ 1147 } 1148 1149 static int register_queue_kobjects(struct net_device *net) 1150 { 1151 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; 1152 1153 #ifdef CONFIG_SYSFS 1154 net->queues_kset = kset_create_and_add("queues", 1155 NULL, &net->dev.kobj); 1156 if (!net->queues_kset) 1157 return -ENOMEM; 1158 #endif 1159 1160 #ifdef CONFIG_RPS 1161 real_rx = net->real_num_rx_queues; 1162 #endif 1163 real_tx = net->real_num_tx_queues; 1164 1165 error = net_rx_queue_update_kobjects(net, 0, real_rx); 1166 if (error) 1167 goto error; 1168 rxq = real_rx; 1169 1170 error = netdev_queue_update_kobjects(net, 0, real_tx); 1171 if (error) 1172 goto error; 1173 txq = real_tx; 1174 1175 return 0; 1176 1177 error: 1178 netdev_queue_update_kobjects(net, txq, 0); 1179 net_rx_queue_update_kobjects(net, rxq, 0); 1180 return error; 1181 } 1182 1183 static void remove_queue_kobjects(struct net_device *net) 1184 { 1185 int real_rx = 0, real_tx = 0; 1186 1187 #ifdef CONFIG_RPS 1188 real_rx = net->real_num_rx_queues; 1189 #endif 1190 real_tx = net->real_num_tx_queues; 1191 1192 net_rx_queue_update_kobjects(net, real_rx, 0); 1193 netdev_queue_update_kobjects(net, real_tx, 0); 1194 #ifdef CONFIG_SYSFS 1195 kset_unregister(net->queues_kset); 1196 #endif 1197 } 1198 1199 static bool net_current_may_mount(void) 1200 { 1201 struct net *net = current->nsproxy->net_ns; 1202 1203 return ns_capable(net->user_ns, CAP_SYS_ADMIN); 1204 } 1205 1206 static void *net_grab_current_ns(void) 1207 { 1208 struct net *ns = current->nsproxy->net_ns; 1209 #ifdef CONFIG_NET_NS 1210 if (ns) 1211 atomic_inc(&ns->passive); 1212 #endif 1213 return ns; 1214 } 1215 1216 static const void *net_initial_ns(void) 1217 { 1218 return &init_net; 1219 } 1220 1221 static const void *net_netlink_ns(struct sock *sk) 1222 { 1223 return sock_net(sk); 1224 } 1225 1226 struct kobj_ns_type_operations net_ns_type_operations = { 1227 .type = KOBJ_NS_TYPE_NET, 1228 .current_may_mount = net_current_may_mount, 1229 .grab_current_ns = net_grab_current_ns, 1230 .netlink_ns = net_netlink_ns, 1231 .initial_ns = net_initial_ns, 1232 .drop_ns = net_drop_ns, 1233 }; 1234 EXPORT_SYMBOL_GPL(net_ns_type_operations); 1235 1236 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 1237 { 1238 struct net_device *dev = to_net_dev(d); 1239 int retval; 1240 1241 /* pass interface to uevent. */ 1242 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 1243 if (retval) 1244 goto exit; 1245 1246 /* pass ifindex to uevent. 1247 * ifindex is useful as it won't change (interface name may change) 1248 * and is what RtNetlink uses natively. */ 1249 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 1250 1251 exit: 1252 return retval; 1253 } 1254 1255 /* 1256 * netdev_release -- destroy and free a dead device. 1257 * Called when last reference to device kobject is gone. 1258 */ 1259 static void netdev_release(struct device *d) 1260 { 1261 struct net_device *dev = to_net_dev(d); 1262 1263 BUG_ON(dev->reg_state != NETREG_RELEASED); 1264 1265 kfree(dev->ifalias); 1266 kfree((char *)dev - dev->padded); 1267 } 1268 1269 static const void *net_namespace(struct device *d) 1270 { 1271 struct net_device *dev; 1272 dev = container_of(d, struct net_device, dev); 1273 return dev_net(dev); 1274 } 1275 1276 static struct class net_class = { 1277 .name = "net", 1278 .dev_release = netdev_release, 1279 .dev_groups = net_class_groups, 1280 .dev_uevent = netdev_uevent, 1281 .ns_type = &net_ns_type_operations, 1282 .namespace = net_namespace, 1283 }; 1284 1285 /* Delete sysfs entries but hold kobject reference until after all 1286 * netdev references are gone. 1287 */ 1288 void netdev_unregister_kobject(struct net_device * net) 1289 { 1290 struct device *dev = &(net->dev); 1291 1292 kobject_get(&dev->kobj); 1293 1294 remove_queue_kobjects(net); 1295 1296 pm_runtime_set_memalloc_noio(dev, false); 1297 1298 device_del(dev); 1299 } 1300 1301 /* Create sysfs entries for network device. */ 1302 int netdev_register_kobject(struct net_device *net) 1303 { 1304 struct device *dev = &(net->dev); 1305 const struct attribute_group **groups = net->sysfs_groups; 1306 int error = 0; 1307 1308 device_initialize(dev); 1309 dev->class = &net_class; 1310 dev->platform_data = net; 1311 dev->groups = groups; 1312 1313 dev_set_name(dev, "%s", net->name); 1314 1315 #ifdef CONFIG_SYSFS 1316 /* Allow for a device specific group */ 1317 if (*groups) 1318 groups++; 1319 1320 *groups++ = &netstat_group; 1321 1322 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 1323 if (net->ieee80211_ptr) 1324 *groups++ = &wireless_group; 1325 #if IS_ENABLED(CONFIG_WIRELESS_EXT) 1326 else if (net->wireless_handlers) 1327 *groups++ = &wireless_group; 1328 #endif 1329 #endif 1330 #endif /* CONFIG_SYSFS */ 1331 1332 error = device_add(dev); 1333 if (error) 1334 return error; 1335 1336 error = register_queue_kobjects(net); 1337 if (error) { 1338 device_del(dev); 1339 return error; 1340 } 1341 1342 pm_runtime_set_memalloc_noio(dev, true); 1343 1344 return error; 1345 } 1346 1347 int netdev_class_create_file_ns(struct class_attribute *class_attr, 1348 const void *ns) 1349 { 1350 return class_create_file_ns(&net_class, class_attr, ns); 1351 } 1352 EXPORT_SYMBOL(netdev_class_create_file_ns); 1353 1354 void netdev_class_remove_file_ns(struct class_attribute *class_attr, 1355 const void *ns) 1356 { 1357 class_remove_file_ns(&net_class, class_attr, ns); 1358 } 1359 EXPORT_SYMBOL(netdev_class_remove_file_ns); 1360 1361 int netdev_kobject_init(void) 1362 { 1363 kobj_ns_type_register(&net_ns_type_operations); 1364 return class_register(&net_class); 1365 } 1366