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