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/wireless.h> 22#include <linux/vmalloc.h> 23#include <net/wext.h> 24 25#include "net-sysfs.h" 26 27#ifdef CONFIG_SYSFS 28static const char fmt_hex[] = "%#x\n"; 29static const char fmt_long_hex[] = "%#lx\n"; 30static const char fmt_dec[] = "%d\n"; 31static const char fmt_ulong[] = "%lu\n"; 32static const char fmt_u64[] = "%llu\n"; 33 34static inline int dev_isalive(const struct net_device *dev) 35{ 36 return dev->reg_state <= NETREG_REGISTERED; 37} 38 39/* use same locking rules as GIF* ioctl's */ 40static ssize_t netdev_show(const struct device *dev, 41 struct device_attribute *attr, char *buf, 42 ssize_t (*format)(const struct net_device *, char *)) 43{ 44 struct net_device *net = to_net_dev(dev); 45 ssize_t ret = -EINVAL; 46 47 read_lock(&dev_base_lock); 48 if (dev_isalive(net)) 49 ret = (*format)(net, buf); 50 read_unlock(&dev_base_lock); 51 52 return ret; 53} 54 55/* generate a show function for simple field */ 56#define NETDEVICE_SHOW(field, format_string) \ 57static ssize_t format_##field(const struct net_device *net, char *buf) \ 58{ \ 59 return sprintf(buf, format_string, net->field); \ 60} \ 61static ssize_t show_##field(struct device *dev, \ 62 struct device_attribute *attr, char *buf) \ 63{ \ 64 return netdev_show(dev, attr, buf, format_##field); \ 65} 66 67 68/* use same locking and permission rules as SIF* ioctl's */ 69static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, 70 const char *buf, size_t len, 71 int (*set)(struct net_device *, unsigned long)) 72{ 73 struct net_device *net = to_net_dev(dev); 74 char *endp; 75 unsigned long new; 76 int ret = -EINVAL; 77 78 if (!capable(CAP_NET_ADMIN)) 79 return -EPERM; 80 81 new = simple_strtoul(buf, &endp, 0); 82 if (endp == buf) 83 goto err; 84 85 if (!rtnl_trylock()) 86 return restart_syscall(); 87 88 if (dev_isalive(net)) { 89 if ((ret = (*set)(net, new)) == 0) 90 ret = len; 91 } 92 rtnl_unlock(); 93 err: 94 return ret; 95} 96 97NETDEVICE_SHOW(dev_id, fmt_hex); 98NETDEVICE_SHOW(addr_assign_type, fmt_dec); 99NETDEVICE_SHOW(addr_len, fmt_dec); 100NETDEVICE_SHOW(iflink, fmt_dec); 101NETDEVICE_SHOW(ifindex, fmt_dec); 102NETDEVICE_SHOW(features, fmt_long_hex); 103NETDEVICE_SHOW(type, fmt_dec); 104NETDEVICE_SHOW(link_mode, fmt_dec); 105 106/* use same locking rules as GIFHWADDR ioctl's */ 107static ssize_t show_address(struct device *dev, struct device_attribute *attr, 108 char *buf) 109{ 110 struct net_device *net = to_net_dev(dev); 111 ssize_t ret = -EINVAL; 112 113 read_lock(&dev_base_lock); 114 if (dev_isalive(net)) 115 ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len); 116 read_unlock(&dev_base_lock); 117 return ret; 118} 119 120static ssize_t show_broadcast(struct device *dev, 121 struct device_attribute *attr, char *buf) 122{ 123 struct net_device *net = to_net_dev(dev); 124 if (dev_isalive(net)) 125 return sysfs_format_mac(buf, net->broadcast, net->addr_len); 126 return -EINVAL; 127} 128 129static ssize_t show_carrier(struct device *dev, 130 struct device_attribute *attr, char *buf) 131{ 132 struct net_device *netdev = to_net_dev(dev); 133 if (netif_running(netdev)) { 134 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); 135 } 136 return -EINVAL; 137} 138 139static ssize_t show_speed(struct device *dev, 140 struct device_attribute *attr, char *buf) 141{ 142 struct net_device *netdev = to_net_dev(dev); 143 int ret = -EINVAL; 144 145 if (!rtnl_trylock()) 146 return restart_syscall(); 147 148 if (netif_running(netdev) && 149 netdev->ethtool_ops && 150 netdev->ethtool_ops->get_settings) { 151 struct ethtool_cmd cmd = { ETHTOOL_GSET }; 152 153 if (!netdev->ethtool_ops->get_settings(netdev, &cmd)) 154 ret = sprintf(buf, fmt_dec, ethtool_cmd_speed(&cmd)); 155 } 156 rtnl_unlock(); 157 return ret; 158} 159 160static ssize_t show_duplex(struct device *dev, 161 struct device_attribute *attr, char *buf) 162{ 163 struct net_device *netdev = to_net_dev(dev); 164 int ret = -EINVAL; 165 166 if (!rtnl_trylock()) 167 return restart_syscall(); 168 169 if (netif_running(netdev) && 170 netdev->ethtool_ops && 171 netdev->ethtool_ops->get_settings) { 172 struct ethtool_cmd cmd = { ETHTOOL_GSET }; 173 174 if (!netdev->ethtool_ops->get_settings(netdev, &cmd)) 175 ret = sprintf(buf, "%s\n", cmd.duplex ? "full" : "half"); 176 } 177 rtnl_unlock(); 178 return ret; 179} 180 181static ssize_t show_dormant(struct device *dev, 182 struct device_attribute *attr, char *buf) 183{ 184 struct net_device *netdev = to_net_dev(dev); 185 186 if (netif_running(netdev)) 187 return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); 188 189 return -EINVAL; 190} 191 192static const char *const operstates[] = { 193 "unknown", 194 "notpresent", /* currently unused */ 195 "down", 196 "lowerlayerdown", 197 "testing", /* currently unused */ 198 "dormant", 199 "up" 200}; 201 202static ssize_t show_operstate(struct device *dev, 203 struct device_attribute *attr, char *buf) 204{ 205 const struct net_device *netdev = to_net_dev(dev); 206 unsigned char operstate; 207 208 read_lock(&dev_base_lock); 209 operstate = netdev->operstate; 210 if (!netif_running(netdev)) 211 operstate = IF_OPER_DOWN; 212 read_unlock(&dev_base_lock); 213 214 if (operstate >= ARRAY_SIZE(operstates)) 215 return -EINVAL; /* should not happen */ 216 217 return sprintf(buf, "%s\n", operstates[operstate]); 218} 219 220/* read-write attributes */ 221NETDEVICE_SHOW(mtu, fmt_dec); 222 223static int change_mtu(struct net_device *net, unsigned long new_mtu) 224{ 225 return dev_set_mtu(net, (int) new_mtu); 226} 227 228static ssize_t store_mtu(struct device *dev, struct device_attribute *attr, 229 const char *buf, size_t len) 230{ 231 return netdev_store(dev, attr, buf, len, change_mtu); 232} 233 234NETDEVICE_SHOW(flags, fmt_hex); 235 236static int change_flags(struct net_device *net, unsigned long new_flags) 237{ 238 return dev_change_flags(net, (unsigned) new_flags); 239} 240 241static ssize_t store_flags(struct device *dev, struct device_attribute *attr, 242 const char *buf, size_t len) 243{ 244 return netdev_store(dev, attr, buf, len, change_flags); 245} 246 247NETDEVICE_SHOW(tx_queue_len, fmt_ulong); 248 249static int change_tx_queue_len(struct net_device *net, unsigned long new_len) 250{ 251 net->tx_queue_len = new_len; 252 return 0; 253} 254 255static ssize_t store_tx_queue_len(struct device *dev, 256 struct device_attribute *attr, 257 const char *buf, size_t len) 258{ 259 return netdev_store(dev, attr, buf, len, change_tx_queue_len); 260} 261 262static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr, 263 const char *buf, size_t len) 264{ 265 struct net_device *netdev = to_net_dev(dev); 266 size_t count = len; 267 ssize_t ret; 268 269 if (!capable(CAP_NET_ADMIN)) 270 return -EPERM; 271 272 /* ignore trailing newline */ 273 if (len > 0 && buf[len - 1] == '\n') 274 --count; 275 276 if (!rtnl_trylock()) 277 return restart_syscall(); 278 ret = dev_set_alias(netdev, buf, count); 279 rtnl_unlock(); 280 281 return ret < 0 ? ret : len; 282} 283 284static ssize_t show_ifalias(struct device *dev, 285 struct device_attribute *attr, char *buf) 286{ 287 const struct net_device *netdev = to_net_dev(dev); 288 ssize_t ret = 0; 289 290 if (!rtnl_trylock()) 291 return restart_syscall(); 292 if (netdev->ifalias) 293 ret = sprintf(buf, "%s\n", netdev->ifalias); 294 rtnl_unlock(); 295 return ret; 296} 297 298static struct device_attribute net_class_attributes[] = { 299 __ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL), 300 __ATTR(addr_len, S_IRUGO, show_addr_len, NULL), 301 __ATTR(dev_id, S_IRUGO, show_dev_id, NULL), 302 __ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias), 303 __ATTR(iflink, S_IRUGO, show_iflink, NULL), 304 __ATTR(ifindex, S_IRUGO, show_ifindex, NULL), 305 __ATTR(features, S_IRUGO, show_features, NULL), 306 __ATTR(type, S_IRUGO, show_type, NULL), 307 __ATTR(link_mode, S_IRUGO, show_link_mode, NULL), 308 __ATTR(address, S_IRUGO, show_address, NULL), 309 __ATTR(broadcast, S_IRUGO, show_broadcast, NULL), 310 __ATTR(carrier, S_IRUGO, show_carrier, NULL), 311 __ATTR(speed, S_IRUGO, show_speed, NULL), 312 __ATTR(duplex, S_IRUGO, show_duplex, NULL), 313 __ATTR(dormant, S_IRUGO, show_dormant, NULL), 314 __ATTR(operstate, S_IRUGO, show_operstate, NULL), 315 __ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu), 316 __ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags), 317 __ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len, 318 store_tx_queue_len), 319 {} 320}; 321 322/* Show a given an attribute in the statistics group */ 323static ssize_t netstat_show(const struct device *d, 324 struct device_attribute *attr, char *buf, 325 unsigned long offset) 326{ 327 struct net_device *dev = to_net_dev(d); 328 ssize_t ret = -EINVAL; 329 330 WARN_ON(offset > sizeof(struct rtnl_link_stats64) || 331 offset % sizeof(u64) != 0); 332 333 read_lock(&dev_base_lock); 334 if (dev_isalive(dev)) { 335 struct rtnl_link_stats64 temp; 336 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 337 338 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset)); 339 } 340 read_unlock(&dev_base_lock); 341 return ret; 342} 343 344/* generate a read-only statistics attribute */ 345#define NETSTAT_ENTRY(name) \ 346static ssize_t show_##name(struct device *d, \ 347 struct device_attribute *attr, char *buf) \ 348{ \ 349 return netstat_show(d, attr, buf, \ 350 offsetof(struct rtnl_link_stats64, name)); \ 351} \ 352static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL) 353 354NETSTAT_ENTRY(rx_packets); 355NETSTAT_ENTRY(tx_packets); 356NETSTAT_ENTRY(rx_bytes); 357NETSTAT_ENTRY(tx_bytes); 358NETSTAT_ENTRY(rx_errors); 359NETSTAT_ENTRY(tx_errors); 360NETSTAT_ENTRY(rx_dropped); 361NETSTAT_ENTRY(tx_dropped); 362NETSTAT_ENTRY(multicast); 363NETSTAT_ENTRY(collisions); 364NETSTAT_ENTRY(rx_length_errors); 365NETSTAT_ENTRY(rx_over_errors); 366NETSTAT_ENTRY(rx_crc_errors); 367NETSTAT_ENTRY(rx_frame_errors); 368NETSTAT_ENTRY(rx_fifo_errors); 369NETSTAT_ENTRY(rx_missed_errors); 370NETSTAT_ENTRY(tx_aborted_errors); 371NETSTAT_ENTRY(tx_carrier_errors); 372NETSTAT_ENTRY(tx_fifo_errors); 373NETSTAT_ENTRY(tx_heartbeat_errors); 374NETSTAT_ENTRY(tx_window_errors); 375NETSTAT_ENTRY(rx_compressed); 376NETSTAT_ENTRY(tx_compressed); 377 378static struct attribute *netstat_attrs[] = { 379 &dev_attr_rx_packets.attr, 380 &dev_attr_tx_packets.attr, 381 &dev_attr_rx_bytes.attr, 382 &dev_attr_tx_bytes.attr, 383 &dev_attr_rx_errors.attr, 384 &dev_attr_tx_errors.attr, 385 &dev_attr_rx_dropped.attr, 386 &dev_attr_tx_dropped.attr, 387 &dev_attr_multicast.attr, 388 &dev_attr_collisions.attr, 389 &dev_attr_rx_length_errors.attr, 390 &dev_attr_rx_over_errors.attr, 391 &dev_attr_rx_crc_errors.attr, 392 &dev_attr_rx_frame_errors.attr, 393 &dev_attr_rx_fifo_errors.attr, 394 &dev_attr_rx_missed_errors.attr, 395 &dev_attr_tx_aborted_errors.attr, 396 &dev_attr_tx_carrier_errors.attr, 397 &dev_attr_tx_fifo_errors.attr, 398 &dev_attr_tx_heartbeat_errors.attr, 399 &dev_attr_tx_window_errors.attr, 400 &dev_attr_rx_compressed.attr, 401 &dev_attr_tx_compressed.attr, 402 NULL 403}; 404 405 406static struct attribute_group netstat_group = { 407 .name = "statistics", 408 .attrs = netstat_attrs, 409}; 410 411#ifdef CONFIG_WIRELESS_EXT_SYSFS 412/* helper function that does all the locking etc for wireless stats */ 413static ssize_t wireless_show(struct device *d, char *buf, 414 ssize_t (*format)(const struct iw_statistics *, 415 char *)) 416{ 417 struct net_device *dev = to_net_dev(d); 418 const struct iw_statistics *iw; 419 ssize_t ret = -EINVAL; 420 421 if (!rtnl_trylock()) 422 return restart_syscall(); 423 if (dev_isalive(dev)) { 424 iw = get_wireless_stats(dev); 425 if (iw) 426 ret = (*format)(iw, buf); 427 } 428 rtnl_unlock(); 429 430 return ret; 431} 432 433/* show function template for wireless fields */ 434#define WIRELESS_SHOW(name, field, format_string) \ 435static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \ 436{ \ 437 return sprintf(buf, format_string, iw->field); \ 438} \ 439static ssize_t show_iw_##name(struct device *d, \ 440 struct device_attribute *attr, char *buf) \ 441{ \ 442 return wireless_show(d, buf, format_iw_##name); \ 443} \ 444static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL) 445 446WIRELESS_SHOW(status, status, fmt_hex); 447WIRELESS_SHOW(link, qual.qual, fmt_dec); 448WIRELESS_SHOW(level, qual.level, fmt_dec); 449WIRELESS_SHOW(noise, qual.noise, fmt_dec); 450WIRELESS_SHOW(nwid, discard.nwid, fmt_dec); 451WIRELESS_SHOW(crypt, discard.code, fmt_dec); 452WIRELESS_SHOW(fragment, discard.fragment, fmt_dec); 453WIRELESS_SHOW(misc, discard.misc, fmt_dec); 454WIRELESS_SHOW(retries, discard.retries, fmt_dec); 455WIRELESS_SHOW(beacon, miss.beacon, fmt_dec); 456 457static struct attribute *wireless_attrs[] = { 458 &dev_attr_status.attr, 459 &dev_attr_link.attr, 460 &dev_attr_level.attr, 461 &dev_attr_noise.attr, 462 &dev_attr_nwid.attr, 463 &dev_attr_crypt.attr, 464 &dev_attr_fragment.attr, 465 &dev_attr_retries.attr, 466 &dev_attr_misc.attr, 467 &dev_attr_beacon.attr, 468 NULL 469}; 470 471static struct attribute_group wireless_group = { 472 .name = "wireless", 473 .attrs = wireless_attrs, 474}; 475#endif 476#endif /* CONFIG_SYSFS */ 477 478#ifdef CONFIG_RPS 479/* 480 * RX queue sysfs structures and functions. 481 */ 482struct rx_queue_attribute { 483 struct attribute attr; 484 ssize_t (*show)(struct netdev_rx_queue *queue, 485 struct rx_queue_attribute *attr, char *buf); 486 ssize_t (*store)(struct netdev_rx_queue *queue, 487 struct rx_queue_attribute *attr, const char *buf, size_t len); 488}; 489#define to_rx_queue_attr(_attr) container_of(_attr, \ 490 struct rx_queue_attribute, attr) 491 492#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 493 494static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 495 char *buf) 496{ 497 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 498 struct netdev_rx_queue *queue = to_rx_queue(kobj); 499 500 if (!attribute->show) 501 return -EIO; 502 503 return attribute->show(queue, attribute, buf); 504} 505 506static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 507 const char *buf, size_t count) 508{ 509 struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 510 struct netdev_rx_queue *queue = to_rx_queue(kobj); 511 512 if (!attribute->store) 513 return -EIO; 514 515 return attribute->store(queue, attribute, buf, count); 516} 517 518static struct sysfs_ops rx_queue_sysfs_ops = { 519 .show = rx_queue_attr_show, 520 .store = rx_queue_attr_store, 521}; 522 523static ssize_t show_rps_map(struct netdev_rx_queue *queue, 524 struct rx_queue_attribute *attribute, char *buf) 525{ 526 struct rps_map *map; 527 cpumask_var_t mask; 528 size_t len = 0; 529 int i; 530 531 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 532 return -ENOMEM; 533 534 rcu_read_lock(); 535 map = rcu_dereference(queue->rps_map); 536 if (map) 537 for (i = 0; i < map->len; i++) 538 cpumask_set_cpu(map->cpus[i], mask); 539 540 len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask); 541 if (PAGE_SIZE - len < 3) { 542 rcu_read_unlock(); 543 free_cpumask_var(mask); 544 return -EINVAL; 545 } 546 rcu_read_unlock(); 547 548 free_cpumask_var(mask); 549 len += sprintf(buf + len, "\n"); 550 return len; 551} 552 553static void rps_map_release(struct rcu_head *rcu) 554{ 555 struct rps_map *map = container_of(rcu, struct rps_map, rcu); 556 557 kfree(map); 558} 559 560static ssize_t store_rps_map(struct netdev_rx_queue *queue, 561 struct rx_queue_attribute *attribute, 562 const char *buf, size_t len) 563{ 564 struct rps_map *old_map, *map; 565 cpumask_var_t mask; 566 int err, cpu, i; 567 static DEFINE_SPINLOCK(rps_map_lock); 568 569 if (!capable(CAP_NET_ADMIN)) 570 return -EPERM; 571 572 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 573 return -ENOMEM; 574 575 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 576 if (err) { 577 free_cpumask_var(mask); 578 return err; 579 } 580 581 map = kzalloc(max_t(unsigned, 582 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 583 GFP_KERNEL); 584 if (!map) { 585 free_cpumask_var(mask); 586 return -ENOMEM; 587 } 588 589 i = 0; 590 for_each_cpu_and(cpu, mask, cpu_online_mask) 591 map->cpus[i++] = cpu; 592 593 if (i) 594 map->len = i; 595 else { 596 kfree(map); 597 map = NULL; 598 } 599 600 spin_lock(&rps_map_lock); 601 old_map = queue->rps_map; 602 rcu_assign_pointer(queue->rps_map, map); 603 spin_unlock(&rps_map_lock); 604 605 if (old_map) 606 call_rcu(&old_map->rcu, rps_map_release); 607 608 free_cpumask_var(mask); 609 return len; 610} 611 612static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 613 struct rx_queue_attribute *attr, 614 char *buf) 615{ 616 struct rps_dev_flow_table *flow_table; 617 unsigned int val = 0; 618 619 rcu_read_lock(); 620 flow_table = rcu_dereference(queue->rps_flow_table); 621 if (flow_table) 622 val = flow_table->mask + 1; 623 rcu_read_unlock(); 624 625 return sprintf(buf, "%u\n", val); 626} 627 628static void rps_dev_flow_table_release_work(struct work_struct *work) 629{ 630 struct rps_dev_flow_table *table = container_of(work, 631 struct rps_dev_flow_table, free_work); 632 633 vfree(table); 634} 635 636static void rps_dev_flow_table_release(struct rcu_head *rcu) 637{ 638 struct rps_dev_flow_table *table = container_of(rcu, 639 struct rps_dev_flow_table, rcu); 640 641 INIT_WORK(&table->free_work, rps_dev_flow_table_release_work); 642 schedule_work(&table->free_work); 643} 644 645static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 646 struct rx_queue_attribute *attr, 647 const char *buf, size_t len) 648{ 649 unsigned int count; 650 char *endp; 651 struct rps_dev_flow_table *table, *old_table; 652 static DEFINE_SPINLOCK(rps_dev_flow_lock); 653 654 if (!capable(CAP_NET_ADMIN)) 655 return -EPERM; 656 657 count = simple_strtoul(buf, &endp, 0); 658 if (endp == buf) 659 return -EINVAL; 660 661 if (count) { 662 int i; 663 664 if (count > 1<<30) { 665 /* Enforce a limit to prevent overflow */ 666 return -EINVAL; 667 } 668 count = roundup_pow_of_two(count); 669 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(count)); 670 if (!table) 671 return -ENOMEM; 672 673 table->mask = count - 1; 674 for (i = 0; i < count; i++) 675 table->flows[i].cpu = RPS_NO_CPU; 676 } else 677 table = NULL; 678 679 spin_lock(&rps_dev_flow_lock); 680 old_table = queue->rps_flow_table; 681 rcu_assign_pointer(queue->rps_flow_table, table); 682 spin_unlock(&rps_dev_flow_lock); 683 684 if (old_table) 685 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 686 687 return len; 688} 689 690static struct rx_queue_attribute rps_cpus_attribute = 691 __ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map); 692 693 694static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute = 695 __ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR, 696 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 697 698static struct attribute *rx_queue_default_attrs[] = { 699 &rps_cpus_attribute.attr, 700 &rps_dev_flow_table_cnt_attribute.attr, 701 NULL 702}; 703 704static void rx_queue_release(struct kobject *kobj) 705{ 706 struct netdev_rx_queue *queue = to_rx_queue(kobj); 707 struct netdev_rx_queue *first = queue->first; 708 709 if (queue->rps_map) 710 call_rcu(&queue->rps_map->rcu, rps_map_release); 711 712 if (queue->rps_flow_table) 713 call_rcu(&queue->rps_flow_table->rcu, 714 rps_dev_flow_table_release); 715 716 if (atomic_dec_and_test(&first->count)) 717 kfree(first); 718} 719 720static struct kobj_type rx_queue_ktype = { 721 .sysfs_ops = &rx_queue_sysfs_ops, 722 .release = rx_queue_release, 723 .default_attrs = rx_queue_default_attrs, 724}; 725 726static int rx_queue_add_kobject(struct net_device *net, int index) 727{ 728 struct netdev_rx_queue *queue = net->_rx + index; 729 struct kobject *kobj = &queue->kobj; 730 int error = 0; 731 732 kobj->kset = net->queues_kset; 733 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 734 "rx-%u", index); 735 if (error) { 736 kobject_put(kobj); 737 return error; 738 } 739 740 kobject_uevent(kobj, KOBJ_ADD); 741 742 return error; 743} 744 745static int rx_queue_register_kobjects(struct net_device *net) 746{ 747 int i; 748 int error = 0; 749 750 net->queues_kset = kset_create_and_add("queues", 751 NULL, &net->dev.kobj); 752 if (!net->queues_kset) 753 return -ENOMEM; 754 for (i = 0; i < net->num_rx_queues; i++) { 755 error = rx_queue_add_kobject(net, i); 756 if (error) 757 break; 758 } 759 760 if (error) 761 while (--i >= 0) 762 kobject_put(&net->_rx[i].kobj); 763 764 return error; 765} 766 767static void rx_queue_remove_kobjects(struct net_device *net) 768{ 769 int i; 770 771 for (i = 0; i < net->num_rx_queues; i++) 772 kobject_put(&net->_rx[i].kobj); 773 kset_unregister(net->queues_kset); 774} 775#endif /* CONFIG_RPS */ 776 777static const void *net_current_ns(void) 778{ 779 return current->nsproxy->net_ns; 780} 781 782static const void *net_initial_ns(void) 783{ 784 return &init_net; 785} 786 787static const void *net_netlink_ns(struct sock *sk) 788{ 789 return sock_net(sk); 790} 791 792static struct kobj_ns_type_operations net_ns_type_operations = { 793 .type = KOBJ_NS_TYPE_NET, 794 .current_ns = net_current_ns, 795 .netlink_ns = net_netlink_ns, 796 .initial_ns = net_initial_ns, 797}; 798 799static void net_kobj_ns_exit(struct net *net) 800{ 801 kobj_ns_exit(KOBJ_NS_TYPE_NET, net); 802} 803 804static struct pernet_operations kobj_net_ops = { 805 .exit = net_kobj_ns_exit, 806}; 807 808 809#ifdef CONFIG_HOTPLUG 810static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 811{ 812 struct net_device *dev = to_net_dev(d); 813 int retval; 814 815 /* pass interface to uevent. */ 816 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 817 if (retval) 818 goto exit; 819 820 /* pass ifindex to uevent. 821 * ifindex is useful as it won't change (interface name may change) 822 * and is what RtNetlink uses natively. */ 823 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 824 825exit: 826 return retval; 827} 828#endif 829 830/* 831 * netdev_release -- destroy and free a dead device. 832 * Called when last reference to device kobject is gone. 833 */ 834static void netdev_release(struct device *d) 835{ 836 struct net_device *dev = to_net_dev(d); 837 838 BUG_ON(dev->reg_state != NETREG_RELEASED); 839 840 kfree(dev->ifalias); 841 kfree((char *)dev - dev->padded); 842} 843 844static const void *net_namespace(struct device *d) 845{ 846 struct net_device *dev; 847 dev = container_of(d, struct net_device, dev); 848 return dev_net(dev); 849} 850 851static struct class net_class = { 852 .name = "net", 853 .dev_release = netdev_release, 854#ifdef CONFIG_SYSFS 855 .dev_attrs = net_class_attributes, 856#endif /* CONFIG_SYSFS */ 857#ifdef CONFIG_HOTPLUG 858 .dev_uevent = netdev_uevent, 859#endif 860 .ns_type = &net_ns_type_operations, 861 .namespace = net_namespace, 862}; 863 864/* Delete sysfs entries but hold kobject reference until after all 865 * netdev references are gone. 866 */ 867void netdev_unregister_kobject(struct net_device * net) 868{ 869 struct device *dev = &(net->dev); 870 871 kobject_get(&dev->kobj); 872 873#ifdef CONFIG_RPS 874 rx_queue_remove_kobjects(net); 875#endif 876 877 device_del(dev); 878} 879 880/* Create sysfs entries for network device. */ 881int netdev_register_kobject(struct net_device *net) 882{ 883 struct device *dev = &(net->dev); 884 const struct attribute_group **groups = net->sysfs_groups; 885 int error = 0; 886 887 device_initialize(dev); 888 dev->class = &net_class; 889 dev->platform_data = net; 890 dev->groups = groups; 891 892 dev_set_name(dev, "%s", net->name); 893 894#ifdef CONFIG_SYSFS 895 /* Allow for a device specific group */ 896 if (*groups) 897 groups++; 898 899 *groups++ = &netstat_group; 900#ifdef CONFIG_WIRELESS_EXT_SYSFS 901 if (net->ieee80211_ptr) 902 *groups++ = &wireless_group; 903#ifdef CONFIG_WIRELESS_EXT 904 else if (net->wireless_handlers) 905 *groups++ = &wireless_group; 906#endif 907#endif 908#endif /* CONFIG_SYSFS */ 909 910 error = device_add(dev); 911 if (error) 912 return error; 913 914#ifdef CONFIG_RPS 915 error = rx_queue_register_kobjects(net); 916 if (error) { 917 device_del(dev); 918 return error; 919 } 920#endif 921 922 return error; 923} 924 925int netdev_class_create_file(struct class_attribute *class_attr) 926{ 927 return class_create_file(&net_class, class_attr); 928} 929EXPORT_SYMBOL(netdev_class_create_file); 930 931void netdev_class_remove_file(struct class_attribute *class_attr) 932{ 933 class_remove_file(&net_class, class_attr); 934} 935EXPORT_SYMBOL(netdev_class_remove_file); 936 937int netdev_kobject_init(void) 938{ 939 kobj_ns_type_register(&net_ns_type_operations); 940 register_pernet_subsys(&kobj_net_ops); 941 return class_register(&net_class); 942} 943