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_SYSFS 502 #define to_rx_queue_attr(_attr) container_of(_attr, \ 503 struct rx_queue_attribute, attr) 504 505 #define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 506 507 static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 508 char *buf) 509 { 510 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 511 struct netdev_rx_queue *queue = to_rx_queue(kobj); 512 513 if (!attribute->show) 514 return -EIO; 515 516 return attribute->show(queue, attribute, buf); 517 } 518 519 static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 520 const char *buf, size_t count) 521 { 522 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 523 struct netdev_rx_queue *queue = to_rx_queue(kobj); 524 525 if (!attribute->store) 526 return -EIO; 527 528 return attribute->store(queue, attribute, buf, count); 529 } 530 531 static const struct sysfs_ops rx_queue_sysfs_ops = { 532 .show = rx_queue_attr_show, 533 .store = rx_queue_attr_store, 534 }; 535 536 #ifdef CONFIG_RPS 537 static ssize_t show_rps_map(struct netdev_rx_queue *queue, 538 struct rx_queue_attribute *attribute, char *buf) 539 { 540 struct rps_map *map; 541 cpumask_var_t mask; 542 size_t len = 0; 543 int i; 544 545 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 546 return -ENOMEM; 547 548 rcu_read_lock(); 549 map = rcu_dereference(queue->rps_map); 550 if (map) 551 for (i = 0; i < map->len; i++) 552 cpumask_set_cpu(map->cpus[i], mask); 553 554 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask); 555 if (PAGE_SIZE - len < 3) { 556 rcu_read_unlock(); 557 free_cpumask_var(mask); 558 return -EINVAL; 559 } 560 rcu_read_unlock(); 561 562 free_cpumask_var(mask); 563 len += sprintf(buf + len, "\n"); 564 return len; 565 } 566 567 static ssize_t store_rps_map(struct netdev_rx_queue *queue, 568 struct rx_queue_attribute *attribute, 569 const char *buf, size_t len) 570 { 571 struct rps_map *old_map, *map; 572 cpumask_var_t mask; 573 int err, cpu, i; 574 static DEFINE_SPINLOCK(rps_map_lock); 575 576 if (!capable(CAP_NET_ADMIN)) 577 return -EPERM; 578 579 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 580 return -ENOMEM; 581 582 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 583 if (err) { 584 free_cpumask_var(mask); 585 return err; 586 } 587 588 map = kzalloc(max_t(unsigned int, 589 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 590 GFP_KERNEL); 591 if (!map) { 592 free_cpumask_var(mask); 593 return -ENOMEM; 594 } 595 596 i = 0; 597 for_each_cpu_and(cpu, mask, cpu_online_mask) 598 map->cpus[i++] = cpu; 599 600 if (i) 601 map->len = i; 602 else { 603 kfree(map); 604 map = NULL; 605 } 606 607 spin_lock(&rps_map_lock); 608 old_map = rcu_dereference_protected(queue->rps_map, 609 lockdep_is_held(&rps_map_lock)); 610 rcu_assign_pointer(queue->rps_map, map); 611 spin_unlock(&rps_map_lock); 612 613 if (map) 614 static_key_slow_inc(&rps_needed); 615 if (old_map) { 616 kfree_rcu(old_map, rcu); 617 static_key_slow_dec(&rps_needed); 618 } 619 free_cpumask_var(mask); 620 return len; 621 } 622 623 static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 624 struct rx_queue_attribute *attr, 625 char *buf) 626 { 627 struct rps_dev_flow_table *flow_table; 628 unsigned long val = 0; 629 630 rcu_read_lock(); 631 flow_table = rcu_dereference(queue->rps_flow_table); 632 if (flow_table) 633 val = (unsigned long)flow_table->mask + 1; 634 rcu_read_unlock(); 635 636 return sprintf(buf, "%lu\n", val); 637 } 638 639 static void rps_dev_flow_table_release(struct rcu_head *rcu) 640 { 641 struct rps_dev_flow_table *table = container_of(rcu, 642 struct rps_dev_flow_table, rcu); 643 vfree(table); 644 } 645 646 static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 647 struct rx_queue_attribute *attr, 648 const char *buf, size_t len) 649 { 650 unsigned long mask, count; 651 struct rps_dev_flow_table *table, *old_table; 652 static DEFINE_SPINLOCK(rps_dev_flow_lock); 653 int rc; 654 655 if (!capable(CAP_NET_ADMIN)) 656 return -EPERM; 657 658 rc = kstrtoul(buf, 0, &count); 659 if (rc < 0) 660 return rc; 661 662 if (count) { 663 mask = count - 1; 664 /* mask = roundup_pow_of_two(count) - 1; 665 * without overflows... 666 */ 667 while ((mask | (mask >> 1)) != mask) 668 mask |= (mask >> 1); 669 /* On 64 bit arches, must check mask fits in table->mask (u32), 670 * and on 32bit arches, must check 671 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow. 672 */ 673 #if BITS_PER_LONG > 32 674 if (mask > (unsigned long)(u32)mask) 675 return -EINVAL; 676 #else 677 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) 678 / sizeof(struct rps_dev_flow)) { 679 /* Enforce a limit to prevent overflow */ 680 return -EINVAL; 681 } 682 #endif 683 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); 684 if (!table) 685 return -ENOMEM; 686 687 table->mask = mask; 688 for (count = 0; count <= mask; count++) 689 table->flows[count].cpu = RPS_NO_CPU; 690 } else 691 table = NULL; 692 693 spin_lock(&rps_dev_flow_lock); 694 old_table = rcu_dereference_protected(queue->rps_flow_table, 695 lockdep_is_held(&rps_dev_flow_lock)); 696 rcu_assign_pointer(queue->rps_flow_table, table); 697 spin_unlock(&rps_dev_flow_lock); 698 699 if (old_table) 700 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 701 702 return len; 703 } 704 705 static struct rx_queue_attribute rps_cpus_attribute = 706 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); 707 708 709 static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = 710 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, 711 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 712 #endif /* CONFIG_RPS */ 713 714 static struct attribute *rx_queue_default_attrs[] = { 715 #ifdef CONFIG_RPS 716 &rps_cpus_attribute.attr, 717 &rps_dev_flow_table_cnt_attribute.attr, 718 #endif 719 NULL 720 }; 721 722 static void rx_queue_release(struct kobject *kobj) 723 { 724 struct netdev_rx_queue *queue = to_rx_queue(kobj); 725 #ifdef CONFIG_RPS 726 struct rps_map *map; 727 struct rps_dev_flow_table *flow_table; 728 729 730 map = rcu_dereference_protected(queue->rps_map, 1); 731 if (map) { 732 RCU_INIT_POINTER(queue->rps_map, NULL); 733 kfree_rcu(map, rcu); 734 } 735 736 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); 737 if (flow_table) { 738 RCU_INIT_POINTER(queue->rps_flow_table, NULL); 739 call_rcu(&flow_table->rcu, rps_dev_flow_table_release); 740 } 741 #endif 742 743 memset(kobj, 0, sizeof(*kobj)); 744 dev_put(queue->dev); 745 } 746 747 static const void *rx_queue_namespace(struct kobject *kobj) 748 { 749 struct netdev_rx_queue *queue = to_rx_queue(kobj); 750 struct device *dev = &queue->dev->dev; 751 const void *ns = NULL; 752 753 if (dev->class && dev->class->ns_type) 754 ns = dev->class->namespace(dev); 755 756 return ns; 757 } 758 759 static struct kobj_type rx_queue_ktype = { 760 .sysfs_ops = &rx_queue_sysfs_ops, 761 .release = rx_queue_release, 762 .default_attrs = rx_queue_default_attrs, 763 .namespace = rx_queue_namespace 764 }; 765 766 static int rx_queue_add_kobject(struct net_device *net, int index) 767 { 768 struct netdev_rx_queue *queue = net->_rx + index; 769 struct kobject *kobj = &queue->kobj; 770 int error = 0; 771 772 kobj->kset = net->queues_kset; 773 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 774 "rx-%u", index); 775 if (error) 776 goto exit; 777 778 if (net->sysfs_rx_queue_group) { 779 error = sysfs_create_group(kobj, net->sysfs_rx_queue_group); 780 if (error) 781 goto exit; 782 } 783 784 kobject_uevent(kobj, KOBJ_ADD); 785 dev_hold(queue->dev); 786 787 return error; 788 exit: 789 kobject_put(kobj); 790 return error; 791 } 792 #endif /* CONFIG_SYFS */ 793 794 int 795 net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num) 796 { 797 #ifdef CONFIG_SYSFS 798 int i; 799 int error = 0; 800 801 #ifndef CONFIG_RPS 802 if (!net->sysfs_rx_queue_group) 803 return 0; 804 #endif 805 for (i = old_num; i < new_num; i++) { 806 error = rx_queue_add_kobject(net, i); 807 if (error) { 808 new_num = old_num; 809 break; 810 } 811 } 812 813 while (--i >= new_num) { 814 if (net->sysfs_rx_queue_group) 815 sysfs_remove_group(&net->_rx[i].kobj, 816 net->sysfs_rx_queue_group); 817 kobject_put(&net->_rx[i].kobj); 818 } 819 820 return error; 821 #else 822 return 0; 823 #endif 824 } 825 826 #ifdef CONFIG_SYSFS 827 /* 828 * netdev_queue sysfs structures and functions. 829 */ 830 struct netdev_queue_attribute { 831 struct attribute attr; 832 ssize_t (*show)(struct netdev_queue *queue, 833 struct netdev_queue_attribute *attr, char *buf); 834 ssize_t (*store)(struct netdev_queue *queue, 835 struct netdev_queue_attribute *attr, const char *buf, size_t len); 836 }; 837 #define to_netdev_queue_attr(_attr) container_of(_attr, \ 838 struct netdev_queue_attribute, attr) 839 840 #define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) 841 842 static ssize_t netdev_queue_attr_show(struct kobject *kobj, 843 struct attribute *attr, char *buf) 844 { 845 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 846 struct netdev_queue *queue = to_netdev_queue(kobj); 847 848 if (!attribute->show) 849 return -EIO; 850 851 return attribute->show(queue, attribute, buf); 852 } 853 854 static ssize_t netdev_queue_attr_store(struct kobject *kobj, 855 struct attribute *attr, 856 const char *buf, size_t count) 857 { 858 struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr); 859 struct netdev_queue *queue = to_netdev_queue(kobj); 860 861 if (!attribute->store) 862 return -EIO; 863 864 return attribute->store(queue, attribute, buf, count); 865 } 866 867 static const struct sysfs_ops netdev_queue_sysfs_ops = { 868 .show = netdev_queue_attr_show, 869 .store = netdev_queue_attr_store, 870 }; 871 872 static ssize_t show_trans_timeout(struct netdev_queue *queue, 873 struct netdev_queue_attribute *attribute, 874 char *buf) 875 { 876 unsigned long trans_timeout; 877 878 spin_lock_irq(&queue->_xmit_lock); 879 trans_timeout = queue->trans_timeout; 880 spin_unlock_irq(&queue->_xmit_lock); 881 882 return sprintf(buf, "%lu", trans_timeout); 883 } 884 885 static struct netdev_queue_attribute queue_trans_timeout = 886 __ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL); 887 888 #ifdef CONFIG_BQL 889 /* 890 * Byte queue limits sysfs structures and functions. 891 */ 892 static ssize_t bql_show(char *buf, unsigned int value) 893 { 894 return sprintf(buf, "%u\n", value); 895 } 896 897 static ssize_t bql_set(const char *buf, const size_t count, 898 unsigned int *pvalue) 899 { 900 unsigned int value; 901 int err; 902 903 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) 904 value = DQL_MAX_LIMIT; 905 else { 906 err = kstrtouint(buf, 10, &value); 907 if (err < 0) 908 return err; 909 if (value > DQL_MAX_LIMIT) 910 return -EINVAL; 911 } 912 913 *pvalue = value; 914 915 return count; 916 } 917 918 static ssize_t bql_show_hold_time(struct netdev_queue *queue, 919 struct netdev_queue_attribute *attr, 920 char *buf) 921 { 922 struct dql *dql = &queue->dql; 923 924 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); 925 } 926 927 static ssize_t bql_set_hold_time(struct netdev_queue *queue, 928 struct netdev_queue_attribute *attribute, 929 const char *buf, size_t len) 930 { 931 struct dql *dql = &queue->dql; 932 unsigned int value; 933 int err; 934 935 err = kstrtouint(buf, 10, &value); 936 if (err < 0) 937 return err; 938 939 dql->slack_hold_time = msecs_to_jiffies(value); 940 941 return len; 942 } 943 944 static struct netdev_queue_attribute bql_hold_time_attribute = 945 __ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time, 946 bql_set_hold_time); 947 948 static ssize_t bql_show_inflight(struct netdev_queue *queue, 949 struct netdev_queue_attribute *attr, 950 char *buf) 951 { 952 struct dql *dql = &queue->dql; 953 954 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); 955 } 956 957 static struct netdev_queue_attribute bql_inflight_attribute = 958 __ATTR(inflight, S_IRUGO, bql_show_inflight, NULL); 959 960 #define BQL_ATTR(NAME, FIELD) \ 961 static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ 962 struct netdev_queue_attribute *attr, \ 963 char *buf) \ 964 { \ 965 return bql_show(buf, queue->dql.FIELD); \ 966 } \ 967 \ 968 static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ 969 struct netdev_queue_attribute *attr, \ 970 const char *buf, size_t len) \ 971 { \ 972 return bql_set(buf, len, &queue->dql.FIELD); \ 973 } \ 974 \ 975 static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \ 976 __ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \ 977 bql_set_ ## NAME); 978 979 BQL_ATTR(limit, limit) 980 BQL_ATTR(limit_max, max_limit) 981 BQL_ATTR(limit_min, min_limit) 982 983 static struct attribute *dql_attrs[] = { 984 &bql_limit_attribute.attr, 985 &bql_limit_max_attribute.attr, 986 &bql_limit_min_attribute.attr, 987 &bql_hold_time_attribute.attr, 988 &bql_inflight_attribute.attr, 989 NULL 990 }; 991 992 static struct attribute_group dql_group = { 993 .name = "byte_queue_limits", 994 .attrs = dql_attrs, 995 }; 996 #endif /* CONFIG_BQL */ 997 998 #ifdef CONFIG_XPS 999 static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue) 1000 { 1001 struct net_device *dev = queue->dev; 1002 int i; 1003 1004 for (i = 0; i < dev->num_tx_queues; i++) 1005 if (queue == &dev->_tx[i]) 1006 break; 1007 1008 BUG_ON(i >= dev->num_tx_queues); 1009 1010 return i; 1011 } 1012 1013 1014 static ssize_t show_xps_map(struct netdev_queue *queue, 1015 struct netdev_queue_attribute *attribute, char *buf) 1016 { 1017 struct net_device *dev = queue->dev; 1018 struct xps_dev_maps *dev_maps; 1019 cpumask_var_t mask; 1020 unsigned long index; 1021 size_t len = 0; 1022 int i; 1023 1024 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 1025 return -ENOMEM; 1026 1027 index = get_netdev_queue_index(queue); 1028 1029 rcu_read_lock(); 1030 dev_maps = rcu_dereference(dev->xps_maps); 1031 if (dev_maps) { 1032 for_each_possible_cpu(i) { 1033 struct xps_map *map = 1034 rcu_dereference(dev_maps->cpu_map[i]); 1035 if (map) { 1036 int j; 1037 for (j = 0; j < map->len; j++) { 1038 if (map->queues[j] == index) { 1039 cpumask_set_cpu(i, mask); 1040 break; 1041 } 1042 } 1043 } 1044 } 1045 } 1046 rcu_read_unlock(); 1047 1048 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask); 1049 if (PAGE_SIZE - len < 3) { 1050 free_cpumask_var(mask); 1051 return -EINVAL; 1052 } 1053 1054 free_cpumask_var(mask); 1055 len += sprintf(buf + len, "\n"); 1056 return len; 1057 } 1058 1059 static ssize_t store_xps_map(struct netdev_queue *queue, 1060 struct netdev_queue_attribute *attribute, 1061 const char *buf, size_t len) 1062 { 1063 struct net_device *dev = queue->dev; 1064 unsigned long index; 1065 cpumask_var_t mask; 1066 int err; 1067 1068 if (!capable(CAP_NET_ADMIN)) 1069 return -EPERM; 1070 1071 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 1072 return -ENOMEM; 1073 1074 index = get_netdev_queue_index(queue); 1075 1076 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 1077 if (err) { 1078 free_cpumask_var(mask); 1079 return err; 1080 } 1081 1082 err = netif_set_xps_queue(dev, mask, index); 1083 1084 free_cpumask_var(mask); 1085 1086 return err ? : len; 1087 } 1088 1089 static struct netdev_queue_attribute xps_cpus_attribute = 1090 __ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map); 1091 #endif /* CONFIG_XPS */ 1092 1093 static struct attribute *netdev_queue_default_attrs[] = { 1094 &queue_trans_timeout.attr, 1095 #ifdef CONFIG_XPS 1096 &xps_cpus_attribute.attr, 1097 #endif 1098 NULL 1099 }; 1100 1101 static void netdev_queue_release(struct kobject *kobj) 1102 { 1103 struct netdev_queue *queue = to_netdev_queue(kobj); 1104 1105 memset(kobj, 0, sizeof(*kobj)); 1106 dev_put(queue->dev); 1107 } 1108 1109 static const void *netdev_queue_namespace(struct kobject *kobj) 1110 { 1111 struct netdev_queue *queue = to_netdev_queue(kobj); 1112 struct device *dev = &queue->dev->dev; 1113 const void *ns = NULL; 1114 1115 if (dev->class && dev->class->ns_type) 1116 ns = dev->class->namespace(dev); 1117 1118 return ns; 1119 } 1120 1121 static struct kobj_type netdev_queue_ktype = { 1122 .sysfs_ops = &netdev_queue_sysfs_ops, 1123 .release = netdev_queue_release, 1124 .default_attrs = netdev_queue_default_attrs, 1125 .namespace = netdev_queue_namespace, 1126 }; 1127 1128 static int netdev_queue_add_kobject(struct net_device *net, int index) 1129 { 1130 struct netdev_queue *queue = net->_tx + index; 1131 struct kobject *kobj = &queue->kobj; 1132 int error = 0; 1133 1134 kobj->kset = net->queues_kset; 1135 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, 1136 "tx-%u", index); 1137 if (error) 1138 goto exit; 1139 1140 #ifdef CONFIG_BQL 1141 error = sysfs_create_group(kobj, &dql_group); 1142 if (error) 1143 goto exit; 1144 #endif 1145 1146 kobject_uevent(kobj, KOBJ_ADD); 1147 dev_hold(queue->dev); 1148 1149 return 0; 1150 exit: 1151 kobject_put(kobj); 1152 return error; 1153 } 1154 #endif /* CONFIG_SYSFS */ 1155 1156 int 1157 netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num) 1158 { 1159 #ifdef CONFIG_SYSFS 1160 int i; 1161 int error = 0; 1162 1163 for (i = old_num; i < new_num; i++) { 1164 error = netdev_queue_add_kobject(net, i); 1165 if (error) { 1166 new_num = old_num; 1167 break; 1168 } 1169 } 1170 1171 while (--i >= new_num) { 1172 struct netdev_queue *queue = net->_tx + i; 1173 1174 #ifdef CONFIG_BQL 1175 sysfs_remove_group(&queue->kobj, &dql_group); 1176 #endif 1177 kobject_put(&queue->kobj); 1178 } 1179 1180 return error; 1181 #else 1182 return 0; 1183 #endif /* CONFIG_SYSFS */ 1184 } 1185 1186 static int register_queue_kobjects(struct net_device *net) 1187 { 1188 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; 1189 1190 #ifdef CONFIG_SYSFS 1191 net->queues_kset = kset_create_and_add("queues", 1192 NULL, &net->dev.kobj); 1193 if (!net->queues_kset) 1194 return -ENOMEM; 1195 real_rx = net->real_num_rx_queues; 1196 #endif 1197 real_tx = net->real_num_tx_queues; 1198 1199 error = net_rx_queue_update_kobjects(net, 0, real_rx); 1200 if (error) 1201 goto error; 1202 rxq = real_rx; 1203 1204 error = netdev_queue_update_kobjects(net, 0, real_tx); 1205 if (error) 1206 goto error; 1207 txq = real_tx; 1208 1209 return 0; 1210 1211 error: 1212 netdev_queue_update_kobjects(net, txq, 0); 1213 net_rx_queue_update_kobjects(net, rxq, 0); 1214 return error; 1215 } 1216 1217 static void remove_queue_kobjects(struct net_device *net) 1218 { 1219 int real_rx = 0, real_tx = 0; 1220 1221 #ifdef CONFIG_SYSFS 1222 real_rx = net->real_num_rx_queues; 1223 #endif 1224 real_tx = net->real_num_tx_queues; 1225 1226 net_rx_queue_update_kobjects(net, real_rx, 0); 1227 netdev_queue_update_kobjects(net, real_tx, 0); 1228 #ifdef CONFIG_SYSFS 1229 kset_unregister(net->queues_kset); 1230 #endif 1231 } 1232 1233 static bool net_current_may_mount(void) 1234 { 1235 struct net *net = current->nsproxy->net_ns; 1236 1237 return ns_capable(net->user_ns, CAP_SYS_ADMIN); 1238 } 1239 1240 static void *net_grab_current_ns(void) 1241 { 1242 struct net *ns = current->nsproxy->net_ns; 1243 #ifdef CONFIG_NET_NS 1244 if (ns) 1245 atomic_inc(&ns->passive); 1246 #endif 1247 return ns; 1248 } 1249 1250 static const void *net_initial_ns(void) 1251 { 1252 return &init_net; 1253 } 1254 1255 static const void *net_netlink_ns(struct sock *sk) 1256 { 1257 return sock_net(sk); 1258 } 1259 1260 struct kobj_ns_type_operations net_ns_type_operations = { 1261 .type = KOBJ_NS_TYPE_NET, 1262 .current_may_mount = net_current_may_mount, 1263 .grab_current_ns = net_grab_current_ns, 1264 .netlink_ns = net_netlink_ns, 1265 .initial_ns = net_initial_ns, 1266 .drop_ns = net_drop_ns, 1267 }; 1268 EXPORT_SYMBOL_GPL(net_ns_type_operations); 1269 1270 static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 1271 { 1272 struct net_device *dev = to_net_dev(d); 1273 int retval; 1274 1275 /* pass interface to uevent. */ 1276 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 1277 if (retval) 1278 goto exit; 1279 1280 /* pass ifindex to uevent. 1281 * ifindex is useful as it won't change (interface name may change) 1282 * and is what RtNetlink uses natively. */ 1283 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 1284 1285 exit: 1286 return retval; 1287 } 1288 1289 /* 1290 * netdev_release -- destroy and free a dead device. 1291 * Called when last reference to device kobject is gone. 1292 */ 1293 static void netdev_release(struct device *d) 1294 { 1295 struct net_device *dev = to_net_dev(d); 1296 1297 BUG_ON(dev->reg_state != NETREG_RELEASED); 1298 1299 kfree(dev->ifalias); 1300 netdev_freemem(dev); 1301 } 1302 1303 static const void *net_namespace(struct device *d) 1304 { 1305 struct net_device *dev; 1306 dev = container_of(d, struct net_device, dev); 1307 return dev_net(dev); 1308 } 1309 1310 static struct class net_class = { 1311 .name = "net", 1312 .dev_release = netdev_release, 1313 .dev_groups = net_class_groups, 1314 .dev_uevent = netdev_uevent, 1315 .ns_type = &net_ns_type_operations, 1316 .namespace = net_namespace, 1317 }; 1318 1319 /* Delete sysfs entries but hold kobject reference until after all 1320 * netdev references are gone. 1321 */ 1322 void netdev_unregister_kobject(struct net_device * net) 1323 { 1324 struct device *dev = &(net->dev); 1325 1326 kobject_get(&dev->kobj); 1327 1328 remove_queue_kobjects(net); 1329 1330 pm_runtime_set_memalloc_noio(dev, false); 1331 1332 device_del(dev); 1333 } 1334 1335 /* Create sysfs entries for network device. */ 1336 int netdev_register_kobject(struct net_device *net) 1337 { 1338 struct device *dev = &(net->dev); 1339 const struct attribute_group **groups = net->sysfs_groups; 1340 int error = 0; 1341 1342 device_initialize(dev); 1343 dev->class = &net_class; 1344 dev->platform_data = net; 1345 dev->groups = groups; 1346 1347 dev_set_name(dev, "%s", net->name); 1348 1349 #ifdef CONFIG_SYSFS 1350 /* Allow for a device specific group */ 1351 if (*groups) 1352 groups++; 1353 1354 *groups++ = &netstat_group; 1355 1356 #if IS_ENABLED(CONFIG_WIRELESS_EXT) || IS_ENABLED(CONFIG_CFG80211) 1357 if (net->ieee80211_ptr) 1358 *groups++ = &wireless_group; 1359 #if IS_ENABLED(CONFIG_WIRELESS_EXT) 1360 else if (net->wireless_handlers) 1361 *groups++ = &wireless_group; 1362 #endif 1363 #endif 1364 #endif /* CONFIG_SYSFS */ 1365 1366 error = device_add(dev); 1367 if (error) 1368 return error; 1369 1370 error = register_queue_kobjects(net); 1371 if (error) { 1372 device_del(dev); 1373 return error; 1374 } 1375 1376 pm_runtime_set_memalloc_noio(dev, true); 1377 1378 return error; 1379 } 1380 1381 int netdev_class_create_file_ns(struct class_attribute *class_attr, 1382 const void *ns) 1383 { 1384 return class_create_file_ns(&net_class, class_attr, ns); 1385 } 1386 EXPORT_SYMBOL(netdev_class_create_file_ns); 1387 1388 void netdev_class_remove_file_ns(struct class_attribute *class_attr, 1389 const void *ns) 1390 { 1391 class_remove_file_ns(&net_class, class_attr, ns); 1392 } 1393 EXPORT_SYMBOL(netdev_class_remove_file_ns); 1394 1395 int __init netdev_kobject_init(void) 1396 { 1397 kobj_ns_type_register(&net_ns_type_operations); 1398 return class_register(&net_class); 1399 } 1400