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