net-sysfs.c (49735B)
1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * net-sysfs.c - network device class and attributes 4 * 5 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org> 6 */ 7 8#include <linux/capability.h> 9#include <linux/kernel.h> 10#include <linux/netdevice.h> 11#include <linux/if_arp.h> 12#include <linux/slab.h> 13#include <linux/sched/signal.h> 14#include <linux/sched/isolation.h> 15#include <linux/nsproxy.h> 16#include <net/sock.h> 17#include <net/net_namespace.h> 18#include <linux/rtnetlink.h> 19#include <linux/vmalloc.h> 20#include <linux/export.h> 21#include <linux/jiffies.h> 22#include <linux/pm_runtime.h> 23#include <linux/of.h> 24#include <linux/of_net.h> 25#include <linux/cpu.h> 26 27#include "dev.h" 28#include "net-sysfs.h" 29 30#ifdef CONFIG_SYSFS 31static const char fmt_hex[] = "%#x\n"; 32static const char fmt_dec[] = "%d\n"; 33static const char fmt_ulong[] = "%lu\n"; 34static const char fmt_u64[] = "%llu\n"; 35 36/* Caller holds RTNL or dev_base_lock */ 37static inline int dev_isalive(const struct net_device *dev) 38{ 39 return dev->reg_state <= NETREG_REGISTERED; 40} 41 42/* use same locking rules as GIF* ioctl's */ 43static ssize_t netdev_show(const struct device *dev, 44 struct device_attribute *attr, char *buf, 45 ssize_t (*format)(const struct net_device *, char *)) 46{ 47 struct net_device *ndev = to_net_dev(dev); 48 ssize_t ret = -EINVAL; 49 50 read_lock(&dev_base_lock); 51 if (dev_isalive(ndev)) 52 ret = (*format)(ndev, buf); 53 read_unlock(&dev_base_lock); 54 55 return ret; 56} 57 58/* generate a show function for simple field */ 59#define NETDEVICE_SHOW(field, format_string) \ 60static ssize_t format_##field(const struct net_device *dev, char *buf) \ 61{ \ 62 return sprintf(buf, format_string, dev->field); \ 63} \ 64static ssize_t field##_show(struct device *dev, \ 65 struct device_attribute *attr, char *buf) \ 66{ \ 67 return netdev_show(dev, attr, buf, format_##field); \ 68} \ 69 70#define NETDEVICE_SHOW_RO(field, format_string) \ 71NETDEVICE_SHOW(field, format_string); \ 72static DEVICE_ATTR_RO(field) 73 74#define NETDEVICE_SHOW_RW(field, format_string) \ 75NETDEVICE_SHOW(field, format_string); \ 76static DEVICE_ATTR_RW(field) 77 78/* use same locking and permission rules as SIF* ioctl's */ 79static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, 80 const char *buf, size_t len, 81 int (*set)(struct net_device *, unsigned long)) 82{ 83 struct net_device *netdev = to_net_dev(dev); 84 struct net *net = dev_net(netdev); 85 unsigned long new; 86 int ret; 87 88 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 89 return -EPERM; 90 91 ret = kstrtoul(buf, 0, &new); 92 if (ret) 93 goto err; 94 95 if (!rtnl_trylock()) 96 return restart_syscall(); 97 98 if (dev_isalive(netdev)) { 99 ret = (*set)(netdev, new); 100 if (ret == 0) 101 ret = len; 102 } 103 rtnl_unlock(); 104 err: 105 return ret; 106} 107 108NETDEVICE_SHOW_RO(dev_id, fmt_hex); 109NETDEVICE_SHOW_RO(dev_port, fmt_dec); 110NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec); 111NETDEVICE_SHOW_RO(addr_len, fmt_dec); 112NETDEVICE_SHOW_RO(ifindex, fmt_dec); 113NETDEVICE_SHOW_RO(type, fmt_dec); 114NETDEVICE_SHOW_RO(link_mode, fmt_dec); 115 116static ssize_t iflink_show(struct device *dev, struct device_attribute *attr, 117 char *buf) 118{ 119 struct net_device *ndev = to_net_dev(dev); 120 121 return sprintf(buf, fmt_dec, dev_get_iflink(ndev)); 122} 123static DEVICE_ATTR_RO(iflink); 124 125static ssize_t format_name_assign_type(const struct net_device *dev, char *buf) 126{ 127 return sprintf(buf, fmt_dec, dev->name_assign_type); 128} 129 130static ssize_t name_assign_type_show(struct device *dev, 131 struct device_attribute *attr, 132 char *buf) 133{ 134 struct net_device *ndev = to_net_dev(dev); 135 ssize_t ret = -EINVAL; 136 137 if (ndev->name_assign_type != NET_NAME_UNKNOWN) 138 ret = netdev_show(dev, attr, buf, format_name_assign_type); 139 140 return ret; 141} 142static DEVICE_ATTR_RO(name_assign_type); 143 144/* use same locking rules as GIFHWADDR ioctl's */ 145static ssize_t address_show(struct device *dev, struct device_attribute *attr, 146 char *buf) 147{ 148 struct net_device *ndev = to_net_dev(dev); 149 ssize_t ret = -EINVAL; 150 151 read_lock(&dev_base_lock); 152 if (dev_isalive(ndev)) 153 ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len); 154 read_unlock(&dev_base_lock); 155 return ret; 156} 157static DEVICE_ATTR_RO(address); 158 159static ssize_t broadcast_show(struct device *dev, 160 struct device_attribute *attr, char *buf) 161{ 162 struct net_device *ndev = to_net_dev(dev); 163 164 if (dev_isalive(ndev)) 165 return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len); 166 return -EINVAL; 167} 168static DEVICE_ATTR_RO(broadcast); 169 170static int change_carrier(struct net_device *dev, unsigned long new_carrier) 171{ 172 if (!netif_running(dev)) 173 return -EINVAL; 174 return dev_change_carrier(dev, (bool)new_carrier); 175} 176 177static ssize_t carrier_store(struct device *dev, struct device_attribute *attr, 178 const char *buf, size_t len) 179{ 180 struct net_device *netdev = to_net_dev(dev); 181 182 /* The check is also done in change_carrier; this helps returning early 183 * without hitting the trylock/restart in netdev_store. 184 */ 185 if (!netdev->netdev_ops->ndo_change_carrier) 186 return -EOPNOTSUPP; 187 188 return netdev_store(dev, attr, buf, len, change_carrier); 189} 190 191static ssize_t carrier_show(struct device *dev, 192 struct device_attribute *attr, char *buf) 193{ 194 struct net_device *netdev = to_net_dev(dev); 195 196 if (netif_running(netdev)) 197 return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev)); 198 199 return -EINVAL; 200} 201static DEVICE_ATTR_RW(carrier); 202 203static ssize_t speed_show(struct device *dev, 204 struct device_attribute *attr, char *buf) 205{ 206 struct net_device *netdev = to_net_dev(dev); 207 int ret = -EINVAL; 208 209 /* The check is also done in __ethtool_get_link_ksettings; this helps 210 * returning early without hitting the trylock/restart below. 211 */ 212 if (!netdev->ethtool_ops->get_link_ksettings) 213 return ret; 214 215 if (!rtnl_trylock()) 216 return restart_syscall(); 217 218 if (netif_running(netdev) && netif_device_present(netdev)) { 219 struct ethtool_link_ksettings cmd; 220 221 if (!__ethtool_get_link_ksettings(netdev, &cmd)) 222 ret = sprintf(buf, fmt_dec, cmd.base.speed); 223 } 224 rtnl_unlock(); 225 return ret; 226} 227static DEVICE_ATTR_RO(speed); 228 229static ssize_t duplex_show(struct device *dev, 230 struct device_attribute *attr, char *buf) 231{ 232 struct net_device *netdev = to_net_dev(dev); 233 int ret = -EINVAL; 234 235 /* The check is also done in __ethtool_get_link_ksettings; this helps 236 * returning early without hitting the trylock/restart below. 237 */ 238 if (!netdev->ethtool_ops->get_link_ksettings) 239 return ret; 240 241 if (!rtnl_trylock()) 242 return restart_syscall(); 243 244 if (netif_running(netdev)) { 245 struct ethtool_link_ksettings cmd; 246 247 if (!__ethtool_get_link_ksettings(netdev, &cmd)) { 248 const char *duplex; 249 250 switch (cmd.base.duplex) { 251 case DUPLEX_HALF: 252 duplex = "half"; 253 break; 254 case DUPLEX_FULL: 255 duplex = "full"; 256 break; 257 default: 258 duplex = "unknown"; 259 break; 260 } 261 ret = sprintf(buf, "%s\n", duplex); 262 } 263 } 264 rtnl_unlock(); 265 return ret; 266} 267static DEVICE_ATTR_RO(duplex); 268 269static ssize_t testing_show(struct device *dev, 270 struct device_attribute *attr, char *buf) 271{ 272 struct net_device *netdev = to_net_dev(dev); 273 274 if (netif_running(netdev)) 275 return sprintf(buf, fmt_dec, !!netif_testing(netdev)); 276 277 return -EINVAL; 278} 279static DEVICE_ATTR_RO(testing); 280 281static ssize_t dormant_show(struct device *dev, 282 struct device_attribute *attr, char *buf) 283{ 284 struct net_device *netdev = to_net_dev(dev); 285 286 if (netif_running(netdev)) 287 return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); 288 289 return -EINVAL; 290} 291static DEVICE_ATTR_RO(dormant); 292 293static const char *const operstates[] = { 294 "unknown", 295 "notpresent", /* currently unused */ 296 "down", 297 "lowerlayerdown", 298 "testing", 299 "dormant", 300 "up" 301}; 302 303static ssize_t operstate_show(struct device *dev, 304 struct device_attribute *attr, char *buf) 305{ 306 const struct net_device *netdev = to_net_dev(dev); 307 unsigned char operstate; 308 309 read_lock(&dev_base_lock); 310 operstate = netdev->operstate; 311 if (!netif_running(netdev)) 312 operstate = IF_OPER_DOWN; 313 read_unlock(&dev_base_lock); 314 315 if (operstate >= ARRAY_SIZE(operstates)) 316 return -EINVAL; /* should not happen */ 317 318 return sprintf(buf, "%s\n", operstates[operstate]); 319} 320static DEVICE_ATTR_RO(operstate); 321 322static ssize_t carrier_changes_show(struct device *dev, 323 struct device_attribute *attr, 324 char *buf) 325{ 326 struct net_device *netdev = to_net_dev(dev); 327 328 return sprintf(buf, fmt_dec, 329 atomic_read(&netdev->carrier_up_count) + 330 atomic_read(&netdev->carrier_down_count)); 331} 332static DEVICE_ATTR_RO(carrier_changes); 333 334static ssize_t carrier_up_count_show(struct device *dev, 335 struct device_attribute *attr, 336 char *buf) 337{ 338 struct net_device *netdev = to_net_dev(dev); 339 340 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_up_count)); 341} 342static DEVICE_ATTR_RO(carrier_up_count); 343 344static ssize_t carrier_down_count_show(struct device *dev, 345 struct device_attribute *attr, 346 char *buf) 347{ 348 struct net_device *netdev = to_net_dev(dev); 349 350 return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_down_count)); 351} 352static DEVICE_ATTR_RO(carrier_down_count); 353 354/* read-write attributes */ 355 356static int change_mtu(struct net_device *dev, unsigned long new_mtu) 357{ 358 return dev_set_mtu(dev, (int)new_mtu); 359} 360 361static ssize_t mtu_store(struct device *dev, struct device_attribute *attr, 362 const char *buf, size_t len) 363{ 364 return netdev_store(dev, attr, buf, len, change_mtu); 365} 366NETDEVICE_SHOW_RW(mtu, fmt_dec); 367 368static int change_flags(struct net_device *dev, unsigned long new_flags) 369{ 370 return dev_change_flags(dev, (unsigned int)new_flags, NULL); 371} 372 373static ssize_t flags_store(struct device *dev, struct device_attribute *attr, 374 const char *buf, size_t len) 375{ 376 return netdev_store(dev, attr, buf, len, change_flags); 377} 378NETDEVICE_SHOW_RW(flags, fmt_hex); 379 380static ssize_t tx_queue_len_store(struct device *dev, 381 struct device_attribute *attr, 382 const char *buf, size_t len) 383{ 384 if (!capable(CAP_NET_ADMIN)) 385 return -EPERM; 386 387 return netdev_store(dev, attr, buf, len, dev_change_tx_queue_len); 388} 389NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec); 390 391static int change_gro_flush_timeout(struct net_device *dev, unsigned long val) 392{ 393 WRITE_ONCE(dev->gro_flush_timeout, val); 394 return 0; 395} 396 397static ssize_t gro_flush_timeout_store(struct device *dev, 398 struct device_attribute *attr, 399 const char *buf, size_t len) 400{ 401 if (!capable(CAP_NET_ADMIN)) 402 return -EPERM; 403 404 return netdev_store(dev, attr, buf, len, change_gro_flush_timeout); 405} 406NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong); 407 408static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val) 409{ 410 WRITE_ONCE(dev->napi_defer_hard_irqs, val); 411 return 0; 412} 413 414static ssize_t napi_defer_hard_irqs_store(struct device *dev, 415 struct device_attribute *attr, 416 const char *buf, size_t len) 417{ 418 if (!capable(CAP_NET_ADMIN)) 419 return -EPERM; 420 421 return netdev_store(dev, attr, buf, len, change_napi_defer_hard_irqs); 422} 423NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec); 424 425static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr, 426 const char *buf, size_t len) 427{ 428 struct net_device *netdev = to_net_dev(dev); 429 struct net *net = dev_net(netdev); 430 size_t count = len; 431 ssize_t ret = 0; 432 433 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 434 return -EPERM; 435 436 /* ignore trailing newline */ 437 if (len > 0 && buf[len - 1] == '\n') 438 --count; 439 440 if (!rtnl_trylock()) 441 return restart_syscall(); 442 443 if (dev_isalive(netdev)) { 444 ret = dev_set_alias(netdev, buf, count); 445 if (ret < 0) 446 goto err; 447 ret = len; 448 netdev_state_change(netdev); 449 } 450err: 451 rtnl_unlock(); 452 453 return ret; 454} 455 456static ssize_t ifalias_show(struct device *dev, 457 struct device_attribute *attr, char *buf) 458{ 459 const struct net_device *netdev = to_net_dev(dev); 460 char tmp[IFALIASZ]; 461 ssize_t ret = 0; 462 463 ret = dev_get_alias(netdev, tmp, sizeof(tmp)); 464 if (ret > 0) 465 ret = sprintf(buf, "%s\n", tmp); 466 return ret; 467} 468static DEVICE_ATTR_RW(ifalias); 469 470static int change_group(struct net_device *dev, unsigned long new_group) 471{ 472 dev_set_group(dev, (int)new_group); 473 return 0; 474} 475 476static ssize_t group_store(struct device *dev, struct device_attribute *attr, 477 const char *buf, size_t len) 478{ 479 return netdev_store(dev, attr, buf, len, change_group); 480} 481NETDEVICE_SHOW(group, fmt_dec); 482static DEVICE_ATTR(netdev_group, 0644, group_show, group_store); 483 484static int change_proto_down(struct net_device *dev, unsigned long proto_down) 485{ 486 return dev_change_proto_down(dev, (bool)proto_down); 487} 488 489static ssize_t proto_down_store(struct device *dev, 490 struct device_attribute *attr, 491 const char *buf, size_t len) 492{ 493 return netdev_store(dev, attr, buf, len, change_proto_down); 494} 495NETDEVICE_SHOW_RW(proto_down, fmt_dec); 496 497static ssize_t phys_port_id_show(struct device *dev, 498 struct device_attribute *attr, char *buf) 499{ 500 struct net_device *netdev = to_net_dev(dev); 501 ssize_t ret = -EINVAL; 502 503 /* The check is also done in dev_get_phys_port_id; this helps returning 504 * early without hitting the trylock/restart below. 505 */ 506 if (!netdev->netdev_ops->ndo_get_phys_port_id) 507 return -EOPNOTSUPP; 508 509 if (!rtnl_trylock()) 510 return restart_syscall(); 511 512 if (dev_isalive(netdev)) { 513 struct netdev_phys_item_id ppid; 514 515 ret = dev_get_phys_port_id(netdev, &ppid); 516 if (!ret) 517 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); 518 } 519 rtnl_unlock(); 520 521 return ret; 522} 523static DEVICE_ATTR_RO(phys_port_id); 524 525static ssize_t phys_port_name_show(struct device *dev, 526 struct device_attribute *attr, char *buf) 527{ 528 struct net_device *netdev = to_net_dev(dev); 529 ssize_t ret = -EINVAL; 530 531 /* The checks are also done in dev_get_phys_port_name; this helps 532 * returning early without hitting the trylock/restart below. 533 */ 534 if (!netdev->netdev_ops->ndo_get_phys_port_name && 535 !netdev->netdev_ops->ndo_get_devlink_port) 536 return -EOPNOTSUPP; 537 538 if (!rtnl_trylock()) 539 return restart_syscall(); 540 541 if (dev_isalive(netdev)) { 542 char name[IFNAMSIZ]; 543 544 ret = dev_get_phys_port_name(netdev, name, sizeof(name)); 545 if (!ret) 546 ret = sprintf(buf, "%s\n", name); 547 } 548 rtnl_unlock(); 549 550 return ret; 551} 552static DEVICE_ATTR_RO(phys_port_name); 553 554static ssize_t phys_switch_id_show(struct device *dev, 555 struct device_attribute *attr, char *buf) 556{ 557 struct net_device *netdev = to_net_dev(dev); 558 ssize_t ret = -EINVAL; 559 560 /* The checks are also done in dev_get_phys_port_name; this helps 561 * returning early without hitting the trylock/restart below. This works 562 * because recurse is false when calling dev_get_port_parent_id. 563 */ 564 if (!netdev->netdev_ops->ndo_get_port_parent_id && 565 !netdev->netdev_ops->ndo_get_devlink_port) 566 return -EOPNOTSUPP; 567 568 if (!rtnl_trylock()) 569 return restart_syscall(); 570 571 if (dev_isalive(netdev)) { 572 struct netdev_phys_item_id ppid = { }; 573 574 ret = dev_get_port_parent_id(netdev, &ppid, false); 575 if (!ret) 576 ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); 577 } 578 rtnl_unlock(); 579 580 return ret; 581} 582static DEVICE_ATTR_RO(phys_switch_id); 583 584static ssize_t threaded_show(struct device *dev, 585 struct device_attribute *attr, char *buf) 586{ 587 struct net_device *netdev = to_net_dev(dev); 588 ssize_t ret = -EINVAL; 589 590 if (!rtnl_trylock()) 591 return restart_syscall(); 592 593 if (dev_isalive(netdev)) 594 ret = sprintf(buf, fmt_dec, netdev->threaded); 595 596 rtnl_unlock(); 597 return ret; 598} 599 600static int modify_napi_threaded(struct net_device *dev, unsigned long val) 601{ 602 int ret; 603 604 if (list_empty(&dev->napi_list)) 605 return -EOPNOTSUPP; 606 607 if (val != 0 && val != 1) 608 return -EOPNOTSUPP; 609 610 ret = dev_set_threaded(dev, val); 611 612 return ret; 613} 614 615static ssize_t threaded_store(struct device *dev, 616 struct device_attribute *attr, 617 const char *buf, size_t len) 618{ 619 return netdev_store(dev, attr, buf, len, modify_napi_threaded); 620} 621static DEVICE_ATTR_RW(threaded); 622 623static struct attribute *net_class_attrs[] __ro_after_init = { 624 &dev_attr_netdev_group.attr, 625 &dev_attr_type.attr, 626 &dev_attr_dev_id.attr, 627 &dev_attr_dev_port.attr, 628 &dev_attr_iflink.attr, 629 &dev_attr_ifindex.attr, 630 &dev_attr_name_assign_type.attr, 631 &dev_attr_addr_assign_type.attr, 632 &dev_attr_addr_len.attr, 633 &dev_attr_link_mode.attr, 634 &dev_attr_address.attr, 635 &dev_attr_broadcast.attr, 636 &dev_attr_speed.attr, 637 &dev_attr_duplex.attr, 638 &dev_attr_dormant.attr, 639 &dev_attr_testing.attr, 640 &dev_attr_operstate.attr, 641 &dev_attr_carrier_changes.attr, 642 &dev_attr_ifalias.attr, 643 &dev_attr_carrier.attr, 644 &dev_attr_mtu.attr, 645 &dev_attr_flags.attr, 646 &dev_attr_tx_queue_len.attr, 647 &dev_attr_gro_flush_timeout.attr, 648 &dev_attr_napi_defer_hard_irqs.attr, 649 &dev_attr_phys_port_id.attr, 650 &dev_attr_phys_port_name.attr, 651 &dev_attr_phys_switch_id.attr, 652 &dev_attr_proto_down.attr, 653 &dev_attr_carrier_up_count.attr, 654 &dev_attr_carrier_down_count.attr, 655 &dev_attr_threaded.attr, 656 NULL, 657}; 658ATTRIBUTE_GROUPS(net_class); 659 660/* Show a given an attribute in the statistics group */ 661static ssize_t netstat_show(const struct device *d, 662 struct device_attribute *attr, char *buf, 663 unsigned long offset) 664{ 665 struct net_device *dev = to_net_dev(d); 666 ssize_t ret = -EINVAL; 667 668 WARN_ON(offset > sizeof(struct rtnl_link_stats64) || 669 offset % sizeof(u64) != 0); 670 671 read_lock(&dev_base_lock); 672 if (dev_isalive(dev)) { 673 struct rtnl_link_stats64 temp; 674 const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); 675 676 ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *)stats) + offset)); 677 } 678 read_unlock(&dev_base_lock); 679 return ret; 680} 681 682/* generate a read-only statistics attribute */ 683#define NETSTAT_ENTRY(name) \ 684static ssize_t name##_show(struct device *d, \ 685 struct device_attribute *attr, char *buf) \ 686{ \ 687 return netstat_show(d, attr, buf, \ 688 offsetof(struct rtnl_link_stats64, name)); \ 689} \ 690static DEVICE_ATTR_RO(name) 691 692NETSTAT_ENTRY(rx_packets); 693NETSTAT_ENTRY(tx_packets); 694NETSTAT_ENTRY(rx_bytes); 695NETSTAT_ENTRY(tx_bytes); 696NETSTAT_ENTRY(rx_errors); 697NETSTAT_ENTRY(tx_errors); 698NETSTAT_ENTRY(rx_dropped); 699NETSTAT_ENTRY(tx_dropped); 700NETSTAT_ENTRY(multicast); 701NETSTAT_ENTRY(collisions); 702NETSTAT_ENTRY(rx_length_errors); 703NETSTAT_ENTRY(rx_over_errors); 704NETSTAT_ENTRY(rx_crc_errors); 705NETSTAT_ENTRY(rx_frame_errors); 706NETSTAT_ENTRY(rx_fifo_errors); 707NETSTAT_ENTRY(rx_missed_errors); 708NETSTAT_ENTRY(tx_aborted_errors); 709NETSTAT_ENTRY(tx_carrier_errors); 710NETSTAT_ENTRY(tx_fifo_errors); 711NETSTAT_ENTRY(tx_heartbeat_errors); 712NETSTAT_ENTRY(tx_window_errors); 713NETSTAT_ENTRY(rx_compressed); 714NETSTAT_ENTRY(tx_compressed); 715NETSTAT_ENTRY(rx_nohandler); 716 717static struct attribute *netstat_attrs[] __ro_after_init = { 718 &dev_attr_rx_packets.attr, 719 &dev_attr_tx_packets.attr, 720 &dev_attr_rx_bytes.attr, 721 &dev_attr_tx_bytes.attr, 722 &dev_attr_rx_errors.attr, 723 &dev_attr_tx_errors.attr, 724 &dev_attr_rx_dropped.attr, 725 &dev_attr_tx_dropped.attr, 726 &dev_attr_multicast.attr, 727 &dev_attr_collisions.attr, 728 &dev_attr_rx_length_errors.attr, 729 &dev_attr_rx_over_errors.attr, 730 &dev_attr_rx_crc_errors.attr, 731 &dev_attr_rx_frame_errors.attr, 732 &dev_attr_rx_fifo_errors.attr, 733 &dev_attr_rx_missed_errors.attr, 734 &dev_attr_tx_aborted_errors.attr, 735 &dev_attr_tx_carrier_errors.attr, 736 &dev_attr_tx_fifo_errors.attr, 737 &dev_attr_tx_heartbeat_errors.attr, 738 &dev_attr_tx_window_errors.attr, 739 &dev_attr_rx_compressed.attr, 740 &dev_attr_tx_compressed.attr, 741 &dev_attr_rx_nohandler.attr, 742 NULL 743}; 744 745static const struct attribute_group netstat_group = { 746 .name = "statistics", 747 .attrs = netstat_attrs, 748}; 749 750static struct attribute *wireless_attrs[] = { 751 NULL 752}; 753 754static const struct attribute_group wireless_group = { 755 .name = "wireless", 756 .attrs = wireless_attrs, 757}; 758 759static bool wireless_group_needed(struct net_device *ndev) 760{ 761#if IS_ENABLED(CONFIG_CFG80211) 762 if (ndev->ieee80211_ptr) 763 return true; 764#endif 765#if IS_ENABLED(CONFIG_WIRELESS_EXT) 766 if (ndev->wireless_handlers) 767 return true; 768#endif 769 return false; 770} 771 772#else /* CONFIG_SYSFS */ 773#define net_class_groups NULL 774#endif /* CONFIG_SYSFS */ 775 776#ifdef CONFIG_SYSFS 777#define to_rx_queue_attr(_attr) \ 778 container_of(_attr, struct rx_queue_attribute, attr) 779 780#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj) 781 782static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr, 783 char *buf) 784{ 785 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 786 struct netdev_rx_queue *queue = to_rx_queue(kobj); 787 788 if (!attribute->show) 789 return -EIO; 790 791 return attribute->show(queue, buf); 792} 793 794static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, 795 const char *buf, size_t count) 796{ 797 const struct rx_queue_attribute *attribute = to_rx_queue_attr(attr); 798 struct netdev_rx_queue *queue = to_rx_queue(kobj); 799 800 if (!attribute->store) 801 return -EIO; 802 803 return attribute->store(queue, buf, count); 804} 805 806static const struct sysfs_ops rx_queue_sysfs_ops = { 807 .show = rx_queue_attr_show, 808 .store = rx_queue_attr_store, 809}; 810 811#ifdef CONFIG_RPS 812static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf) 813{ 814 struct rps_map *map; 815 cpumask_var_t mask; 816 int i, len; 817 818 if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) 819 return -ENOMEM; 820 821 rcu_read_lock(); 822 map = rcu_dereference(queue->rps_map); 823 if (map) 824 for (i = 0; i < map->len; i++) 825 cpumask_set_cpu(map->cpus[i], mask); 826 827 len = snprintf(buf, PAGE_SIZE, "%*pb\n", cpumask_pr_args(mask)); 828 rcu_read_unlock(); 829 free_cpumask_var(mask); 830 831 return len < PAGE_SIZE ? len : -EINVAL; 832} 833 834static ssize_t store_rps_map(struct netdev_rx_queue *queue, 835 const char *buf, size_t len) 836{ 837 struct rps_map *old_map, *map; 838 cpumask_var_t mask; 839 int err, cpu, i; 840 static DEFINE_MUTEX(rps_map_mutex); 841 842 if (!capable(CAP_NET_ADMIN)) 843 return -EPERM; 844 845 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 846 return -ENOMEM; 847 848 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 849 if (err) { 850 free_cpumask_var(mask); 851 return err; 852 } 853 854 if (!cpumask_empty(mask)) { 855 cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_DOMAIN)); 856 cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_WQ)); 857 if (cpumask_empty(mask)) { 858 free_cpumask_var(mask); 859 return -EINVAL; 860 } 861 } 862 863 map = kzalloc(max_t(unsigned int, 864 RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES), 865 GFP_KERNEL); 866 if (!map) { 867 free_cpumask_var(mask); 868 return -ENOMEM; 869 } 870 871 i = 0; 872 for_each_cpu_and(cpu, mask, cpu_online_mask) 873 map->cpus[i++] = cpu; 874 875 if (i) { 876 map->len = i; 877 } else { 878 kfree(map); 879 map = NULL; 880 } 881 882 mutex_lock(&rps_map_mutex); 883 old_map = rcu_dereference_protected(queue->rps_map, 884 mutex_is_locked(&rps_map_mutex)); 885 rcu_assign_pointer(queue->rps_map, map); 886 887 if (map) 888 static_branch_inc(&rps_needed); 889 if (old_map) 890 static_branch_dec(&rps_needed); 891 892 mutex_unlock(&rps_map_mutex); 893 894 if (old_map) 895 kfree_rcu(old_map, rcu); 896 897 free_cpumask_var(mask); 898 return len; 899} 900 901static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 902 char *buf) 903{ 904 struct rps_dev_flow_table *flow_table; 905 unsigned long val = 0; 906 907 rcu_read_lock(); 908 flow_table = rcu_dereference(queue->rps_flow_table); 909 if (flow_table) 910 val = (unsigned long)flow_table->mask + 1; 911 rcu_read_unlock(); 912 913 return sprintf(buf, "%lu\n", val); 914} 915 916static void rps_dev_flow_table_release(struct rcu_head *rcu) 917{ 918 struct rps_dev_flow_table *table = container_of(rcu, 919 struct rps_dev_flow_table, rcu); 920 vfree(table); 921} 922 923static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, 924 const char *buf, size_t len) 925{ 926 unsigned long mask, count; 927 struct rps_dev_flow_table *table, *old_table; 928 static DEFINE_SPINLOCK(rps_dev_flow_lock); 929 int rc; 930 931 if (!capable(CAP_NET_ADMIN)) 932 return -EPERM; 933 934 rc = kstrtoul(buf, 0, &count); 935 if (rc < 0) 936 return rc; 937 938 if (count) { 939 mask = count - 1; 940 /* mask = roundup_pow_of_two(count) - 1; 941 * without overflows... 942 */ 943 while ((mask | (mask >> 1)) != mask) 944 mask |= (mask >> 1); 945 /* On 64 bit arches, must check mask fits in table->mask (u32), 946 * and on 32bit arches, must check 947 * RPS_DEV_FLOW_TABLE_SIZE(mask + 1) doesn't overflow. 948 */ 949#if BITS_PER_LONG > 32 950 if (mask > (unsigned long)(u32)mask) 951 return -EINVAL; 952#else 953 if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1)) 954 / sizeof(struct rps_dev_flow)) { 955 /* Enforce a limit to prevent overflow */ 956 return -EINVAL; 957 } 958#endif 959 table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1)); 960 if (!table) 961 return -ENOMEM; 962 963 table->mask = mask; 964 for (count = 0; count <= mask; count++) 965 table->flows[count].cpu = RPS_NO_CPU; 966 } else { 967 table = NULL; 968 } 969 970 spin_lock(&rps_dev_flow_lock); 971 old_table = rcu_dereference_protected(queue->rps_flow_table, 972 lockdep_is_held(&rps_dev_flow_lock)); 973 rcu_assign_pointer(queue->rps_flow_table, table); 974 spin_unlock(&rps_dev_flow_lock); 975 976 if (old_table) 977 call_rcu(&old_table->rcu, rps_dev_flow_table_release); 978 979 return len; 980} 981 982static struct rx_queue_attribute rps_cpus_attribute __ro_after_init 983 = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map); 984 985static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init 986 = __ATTR(rps_flow_cnt, 0644, 987 show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); 988#endif /* CONFIG_RPS */ 989 990static struct attribute *rx_queue_default_attrs[] __ro_after_init = { 991#ifdef CONFIG_RPS 992 &rps_cpus_attribute.attr, 993 &rps_dev_flow_table_cnt_attribute.attr, 994#endif 995 NULL 996}; 997ATTRIBUTE_GROUPS(rx_queue_default); 998 999static void rx_queue_release(struct kobject *kobj) 1000{ 1001 struct netdev_rx_queue *queue = to_rx_queue(kobj); 1002#ifdef CONFIG_RPS 1003 struct rps_map *map; 1004 struct rps_dev_flow_table *flow_table; 1005 1006 map = rcu_dereference_protected(queue->rps_map, 1); 1007 if (map) { 1008 RCU_INIT_POINTER(queue->rps_map, NULL); 1009 kfree_rcu(map, rcu); 1010 } 1011 1012 flow_table = rcu_dereference_protected(queue->rps_flow_table, 1); 1013 if (flow_table) { 1014 RCU_INIT_POINTER(queue->rps_flow_table, NULL); 1015 call_rcu(&flow_table->rcu, rps_dev_flow_table_release); 1016 } 1017#endif 1018 1019 memset(kobj, 0, sizeof(*kobj)); 1020 dev_put_track(queue->dev, &queue->dev_tracker); 1021} 1022 1023static const void *rx_queue_namespace(struct kobject *kobj) 1024{ 1025 struct netdev_rx_queue *queue = to_rx_queue(kobj); 1026 struct device *dev = &queue->dev->dev; 1027 const void *ns = NULL; 1028 1029 if (dev->class && dev->class->ns_type) 1030 ns = dev->class->namespace(dev); 1031 1032 return ns; 1033} 1034 1035static void rx_queue_get_ownership(struct kobject *kobj, 1036 kuid_t *uid, kgid_t *gid) 1037{ 1038 const struct net *net = rx_queue_namespace(kobj); 1039 1040 net_ns_get_ownership(net, uid, gid); 1041} 1042 1043static struct kobj_type rx_queue_ktype __ro_after_init = { 1044 .sysfs_ops = &rx_queue_sysfs_ops, 1045 .release = rx_queue_release, 1046 .default_groups = rx_queue_default_groups, 1047 .namespace = rx_queue_namespace, 1048 .get_ownership = rx_queue_get_ownership, 1049}; 1050 1051static int rx_queue_add_kobject(struct net_device *dev, int index) 1052{ 1053 struct netdev_rx_queue *queue = dev->_rx + index; 1054 struct kobject *kobj = &queue->kobj; 1055 int error = 0; 1056 1057 /* Kobject_put later will trigger rx_queue_release call which 1058 * decreases dev refcount: Take that reference here 1059 */ 1060 dev_hold_track(queue->dev, &queue->dev_tracker, GFP_KERNEL); 1061 1062 kobj->kset = dev->queues_kset; 1063 error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, 1064 "rx-%u", index); 1065 if (error) 1066 goto err; 1067 1068 if (dev->sysfs_rx_queue_group) { 1069 error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); 1070 if (error) 1071 goto err; 1072 } 1073 1074 kobject_uevent(kobj, KOBJ_ADD); 1075 1076 return error; 1077 1078err: 1079 kobject_put(kobj); 1080 return error; 1081} 1082 1083static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid, 1084 kgid_t kgid) 1085{ 1086 struct netdev_rx_queue *queue = dev->_rx + index; 1087 struct kobject *kobj = &queue->kobj; 1088 int error; 1089 1090 error = sysfs_change_owner(kobj, kuid, kgid); 1091 if (error) 1092 return error; 1093 1094 if (dev->sysfs_rx_queue_group) 1095 error = sysfs_group_change_owner( 1096 kobj, dev->sysfs_rx_queue_group, kuid, kgid); 1097 1098 return error; 1099} 1100#endif /* CONFIG_SYSFS */ 1101 1102int 1103net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 1104{ 1105#ifdef CONFIG_SYSFS 1106 int i; 1107 int error = 0; 1108 1109#ifndef CONFIG_RPS 1110 if (!dev->sysfs_rx_queue_group) 1111 return 0; 1112#endif 1113 for (i = old_num; i < new_num; i++) { 1114 error = rx_queue_add_kobject(dev, i); 1115 if (error) { 1116 new_num = old_num; 1117 break; 1118 } 1119 } 1120 1121 while (--i >= new_num) { 1122 struct kobject *kobj = &dev->_rx[i].kobj; 1123 1124 if (!refcount_read(&dev_net(dev)->ns.count)) 1125 kobj->uevent_suppress = 1; 1126 if (dev->sysfs_rx_queue_group) 1127 sysfs_remove_group(kobj, dev->sysfs_rx_queue_group); 1128 kobject_put(kobj); 1129 } 1130 1131 return error; 1132#else 1133 return 0; 1134#endif 1135} 1136 1137static int net_rx_queue_change_owner(struct net_device *dev, int num, 1138 kuid_t kuid, kgid_t kgid) 1139{ 1140#ifdef CONFIG_SYSFS 1141 int error = 0; 1142 int i; 1143 1144#ifndef CONFIG_RPS 1145 if (!dev->sysfs_rx_queue_group) 1146 return 0; 1147#endif 1148 for (i = 0; i < num; i++) { 1149 error = rx_queue_change_owner(dev, i, kuid, kgid); 1150 if (error) 1151 break; 1152 } 1153 1154 return error; 1155#else 1156 return 0; 1157#endif 1158} 1159 1160#ifdef CONFIG_SYSFS 1161/* 1162 * netdev_queue sysfs structures and functions. 1163 */ 1164struct netdev_queue_attribute { 1165 struct attribute attr; 1166 ssize_t (*show)(struct netdev_queue *queue, char *buf); 1167 ssize_t (*store)(struct netdev_queue *queue, 1168 const char *buf, size_t len); 1169}; 1170#define to_netdev_queue_attr(_attr) \ 1171 container_of(_attr, struct netdev_queue_attribute, attr) 1172 1173#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj) 1174 1175static ssize_t netdev_queue_attr_show(struct kobject *kobj, 1176 struct attribute *attr, char *buf) 1177{ 1178 const struct netdev_queue_attribute *attribute 1179 = to_netdev_queue_attr(attr); 1180 struct netdev_queue *queue = to_netdev_queue(kobj); 1181 1182 if (!attribute->show) 1183 return -EIO; 1184 1185 return attribute->show(queue, buf); 1186} 1187 1188static ssize_t netdev_queue_attr_store(struct kobject *kobj, 1189 struct attribute *attr, 1190 const char *buf, size_t count) 1191{ 1192 const struct netdev_queue_attribute *attribute 1193 = to_netdev_queue_attr(attr); 1194 struct netdev_queue *queue = to_netdev_queue(kobj); 1195 1196 if (!attribute->store) 1197 return -EIO; 1198 1199 return attribute->store(queue, buf, count); 1200} 1201 1202static const struct sysfs_ops netdev_queue_sysfs_ops = { 1203 .show = netdev_queue_attr_show, 1204 .store = netdev_queue_attr_store, 1205}; 1206 1207static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf) 1208{ 1209 unsigned long trans_timeout = atomic_long_read(&queue->trans_timeout); 1210 1211 return sprintf(buf, fmt_ulong, trans_timeout); 1212} 1213 1214static unsigned int get_netdev_queue_index(struct netdev_queue *queue) 1215{ 1216 struct net_device *dev = queue->dev; 1217 unsigned int i; 1218 1219 i = queue - dev->_tx; 1220 BUG_ON(i >= dev->num_tx_queues); 1221 1222 return i; 1223} 1224 1225static ssize_t traffic_class_show(struct netdev_queue *queue, 1226 char *buf) 1227{ 1228 struct net_device *dev = queue->dev; 1229 int num_tc, tc; 1230 int index; 1231 1232 if (!netif_is_multiqueue(dev)) 1233 return -ENOENT; 1234 1235 if (!rtnl_trylock()) 1236 return restart_syscall(); 1237 1238 index = get_netdev_queue_index(queue); 1239 1240 /* If queue belongs to subordinate dev use its TC mapping */ 1241 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev; 1242 1243 num_tc = dev->num_tc; 1244 tc = netdev_txq_to_tc(dev, index); 1245 1246 rtnl_unlock(); 1247 1248 if (tc < 0) 1249 return -EINVAL; 1250 1251 /* We can report the traffic class one of two ways: 1252 * Subordinate device traffic classes are reported with the traffic 1253 * class first, and then the subordinate class so for example TC0 on 1254 * subordinate device 2 will be reported as "0-2". If the queue 1255 * belongs to the root device it will be reported with just the 1256 * traffic class, so just "0" for TC 0 for example. 1257 */ 1258 return num_tc < 0 ? sprintf(buf, "%d%d\n", tc, num_tc) : 1259 sprintf(buf, "%d\n", tc); 1260} 1261 1262#ifdef CONFIG_XPS 1263static ssize_t tx_maxrate_show(struct netdev_queue *queue, 1264 char *buf) 1265{ 1266 return sprintf(buf, "%lu\n", queue->tx_maxrate); 1267} 1268 1269static ssize_t tx_maxrate_store(struct netdev_queue *queue, 1270 const char *buf, size_t len) 1271{ 1272 struct net_device *dev = queue->dev; 1273 int err, index = get_netdev_queue_index(queue); 1274 u32 rate = 0; 1275 1276 if (!capable(CAP_NET_ADMIN)) 1277 return -EPERM; 1278 1279 /* The check is also done later; this helps returning early without 1280 * hitting the trylock/restart below. 1281 */ 1282 if (!dev->netdev_ops->ndo_set_tx_maxrate) 1283 return -EOPNOTSUPP; 1284 1285 err = kstrtou32(buf, 10, &rate); 1286 if (err < 0) 1287 return err; 1288 1289 if (!rtnl_trylock()) 1290 return restart_syscall(); 1291 1292 err = -EOPNOTSUPP; 1293 if (dev->netdev_ops->ndo_set_tx_maxrate) 1294 err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate); 1295 1296 rtnl_unlock(); 1297 if (!err) { 1298 queue->tx_maxrate = rate; 1299 return len; 1300 } 1301 return err; 1302} 1303 1304static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init 1305 = __ATTR_RW(tx_maxrate); 1306#endif 1307 1308static struct netdev_queue_attribute queue_trans_timeout __ro_after_init 1309 = __ATTR_RO(tx_timeout); 1310 1311static struct netdev_queue_attribute queue_traffic_class __ro_after_init 1312 = __ATTR_RO(traffic_class); 1313 1314#ifdef CONFIG_BQL 1315/* 1316 * Byte queue limits sysfs structures and functions. 1317 */ 1318static ssize_t bql_show(char *buf, unsigned int value) 1319{ 1320 return sprintf(buf, "%u\n", value); 1321} 1322 1323static ssize_t bql_set(const char *buf, const size_t count, 1324 unsigned int *pvalue) 1325{ 1326 unsigned int value; 1327 int err; 1328 1329 if (!strcmp(buf, "max") || !strcmp(buf, "max\n")) { 1330 value = DQL_MAX_LIMIT; 1331 } else { 1332 err = kstrtouint(buf, 10, &value); 1333 if (err < 0) 1334 return err; 1335 if (value > DQL_MAX_LIMIT) 1336 return -EINVAL; 1337 } 1338 1339 *pvalue = value; 1340 1341 return count; 1342} 1343 1344static ssize_t bql_show_hold_time(struct netdev_queue *queue, 1345 char *buf) 1346{ 1347 struct dql *dql = &queue->dql; 1348 1349 return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); 1350} 1351 1352static ssize_t bql_set_hold_time(struct netdev_queue *queue, 1353 const char *buf, size_t len) 1354{ 1355 struct dql *dql = &queue->dql; 1356 unsigned int value; 1357 int err; 1358 1359 err = kstrtouint(buf, 10, &value); 1360 if (err < 0) 1361 return err; 1362 1363 dql->slack_hold_time = msecs_to_jiffies(value); 1364 1365 return len; 1366} 1367 1368static struct netdev_queue_attribute bql_hold_time_attribute __ro_after_init 1369 = __ATTR(hold_time, 0644, 1370 bql_show_hold_time, bql_set_hold_time); 1371 1372static ssize_t bql_show_inflight(struct netdev_queue *queue, 1373 char *buf) 1374{ 1375 struct dql *dql = &queue->dql; 1376 1377 return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed); 1378} 1379 1380static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init = 1381 __ATTR(inflight, 0444, bql_show_inflight, NULL); 1382 1383#define BQL_ATTR(NAME, FIELD) \ 1384static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ 1385 char *buf) \ 1386{ \ 1387 return bql_show(buf, queue->dql.FIELD); \ 1388} \ 1389 \ 1390static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ 1391 const char *buf, size_t len) \ 1392{ \ 1393 return bql_set(buf, len, &queue->dql.FIELD); \ 1394} \ 1395 \ 1396static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \ 1397 = __ATTR(NAME, 0644, \ 1398 bql_show_ ## NAME, bql_set_ ## NAME) 1399 1400BQL_ATTR(limit, limit); 1401BQL_ATTR(limit_max, max_limit); 1402BQL_ATTR(limit_min, min_limit); 1403 1404static struct attribute *dql_attrs[] __ro_after_init = { 1405 &bql_limit_attribute.attr, 1406 &bql_limit_max_attribute.attr, 1407 &bql_limit_min_attribute.attr, 1408 &bql_hold_time_attribute.attr, 1409 &bql_inflight_attribute.attr, 1410 NULL 1411}; 1412 1413static const struct attribute_group dql_group = { 1414 .name = "byte_queue_limits", 1415 .attrs = dql_attrs, 1416}; 1417#endif /* CONFIG_BQL */ 1418 1419#ifdef CONFIG_XPS 1420static ssize_t xps_queue_show(struct net_device *dev, unsigned int index, 1421 int tc, char *buf, enum xps_map_type type) 1422{ 1423 struct xps_dev_maps *dev_maps; 1424 unsigned long *mask; 1425 unsigned int nr_ids; 1426 int j, len; 1427 1428 rcu_read_lock(); 1429 dev_maps = rcu_dereference(dev->xps_maps[type]); 1430 1431 /* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0 1432 * when dev_maps hasn't been allocated yet, to be backward compatible. 1433 */ 1434 nr_ids = dev_maps ? dev_maps->nr_ids : 1435 (type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues); 1436 1437 mask = bitmap_zalloc(nr_ids, GFP_NOWAIT); 1438 if (!mask) { 1439 rcu_read_unlock(); 1440 return -ENOMEM; 1441 } 1442 1443 if (!dev_maps || tc >= dev_maps->num_tc) 1444 goto out_no_maps; 1445 1446 for (j = 0; j < nr_ids; j++) { 1447 int i, tci = j * dev_maps->num_tc + tc; 1448 struct xps_map *map; 1449 1450 map = rcu_dereference(dev_maps->attr_map[tci]); 1451 if (!map) 1452 continue; 1453 1454 for (i = map->len; i--;) { 1455 if (map->queues[i] == index) { 1456 __set_bit(j, mask); 1457 break; 1458 } 1459 } 1460 } 1461out_no_maps: 1462 rcu_read_unlock(); 1463 1464 len = bitmap_print_to_pagebuf(false, buf, mask, nr_ids); 1465 bitmap_free(mask); 1466 1467 return len < PAGE_SIZE ? len : -EINVAL; 1468} 1469 1470static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf) 1471{ 1472 struct net_device *dev = queue->dev; 1473 unsigned int index; 1474 int len, tc; 1475 1476 if (!netif_is_multiqueue(dev)) 1477 return -ENOENT; 1478 1479 index = get_netdev_queue_index(queue); 1480 1481 if (!rtnl_trylock()) 1482 return restart_syscall(); 1483 1484 /* If queue belongs to subordinate dev use its map */ 1485 dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev; 1486 1487 tc = netdev_txq_to_tc(dev, index); 1488 if (tc < 0) { 1489 rtnl_unlock(); 1490 return -EINVAL; 1491 } 1492 1493 /* Make sure the subordinate device can't be freed */ 1494 get_device(&dev->dev); 1495 rtnl_unlock(); 1496 1497 len = xps_queue_show(dev, index, tc, buf, XPS_CPUS); 1498 1499 put_device(&dev->dev); 1500 return len; 1501} 1502 1503static ssize_t xps_cpus_store(struct netdev_queue *queue, 1504 const char *buf, size_t len) 1505{ 1506 struct net_device *dev = queue->dev; 1507 unsigned int index; 1508 cpumask_var_t mask; 1509 int err; 1510 1511 if (!netif_is_multiqueue(dev)) 1512 return -ENOENT; 1513 1514 if (!capable(CAP_NET_ADMIN)) 1515 return -EPERM; 1516 1517 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 1518 return -ENOMEM; 1519 1520 index = get_netdev_queue_index(queue); 1521 1522 err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits); 1523 if (err) { 1524 free_cpumask_var(mask); 1525 return err; 1526 } 1527 1528 if (!rtnl_trylock()) { 1529 free_cpumask_var(mask); 1530 return restart_syscall(); 1531 } 1532 1533 err = netif_set_xps_queue(dev, mask, index); 1534 rtnl_unlock(); 1535 1536 free_cpumask_var(mask); 1537 1538 return err ? : len; 1539} 1540 1541static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init 1542 = __ATTR_RW(xps_cpus); 1543 1544static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf) 1545{ 1546 struct net_device *dev = queue->dev; 1547 unsigned int index; 1548 int tc; 1549 1550 index = get_netdev_queue_index(queue); 1551 1552 if (!rtnl_trylock()) 1553 return restart_syscall(); 1554 1555 tc = netdev_txq_to_tc(dev, index); 1556 rtnl_unlock(); 1557 if (tc < 0) 1558 return -EINVAL; 1559 1560 return xps_queue_show(dev, index, tc, buf, XPS_RXQS); 1561} 1562 1563static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf, 1564 size_t len) 1565{ 1566 struct net_device *dev = queue->dev; 1567 struct net *net = dev_net(dev); 1568 unsigned long *mask; 1569 unsigned int index; 1570 int err; 1571 1572 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 1573 return -EPERM; 1574 1575 mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL); 1576 if (!mask) 1577 return -ENOMEM; 1578 1579 index = get_netdev_queue_index(queue); 1580 1581 err = bitmap_parse(buf, len, mask, dev->num_rx_queues); 1582 if (err) { 1583 bitmap_free(mask); 1584 return err; 1585 } 1586 1587 if (!rtnl_trylock()) { 1588 bitmap_free(mask); 1589 return restart_syscall(); 1590 } 1591 1592 cpus_read_lock(); 1593 err = __netif_set_xps_queue(dev, mask, index, XPS_RXQS); 1594 cpus_read_unlock(); 1595 1596 rtnl_unlock(); 1597 1598 bitmap_free(mask); 1599 return err ? : len; 1600} 1601 1602static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init 1603 = __ATTR_RW(xps_rxqs); 1604#endif /* CONFIG_XPS */ 1605 1606static struct attribute *netdev_queue_default_attrs[] __ro_after_init = { 1607 &queue_trans_timeout.attr, 1608 &queue_traffic_class.attr, 1609#ifdef CONFIG_XPS 1610 &xps_cpus_attribute.attr, 1611 &xps_rxqs_attribute.attr, 1612 &queue_tx_maxrate.attr, 1613#endif 1614 NULL 1615}; 1616ATTRIBUTE_GROUPS(netdev_queue_default); 1617 1618static void netdev_queue_release(struct kobject *kobj) 1619{ 1620 struct netdev_queue *queue = to_netdev_queue(kobj); 1621 1622 memset(kobj, 0, sizeof(*kobj)); 1623 dev_put_track(queue->dev, &queue->dev_tracker); 1624} 1625 1626static const void *netdev_queue_namespace(struct kobject *kobj) 1627{ 1628 struct netdev_queue *queue = to_netdev_queue(kobj); 1629 struct device *dev = &queue->dev->dev; 1630 const void *ns = NULL; 1631 1632 if (dev->class && dev->class->ns_type) 1633 ns = dev->class->namespace(dev); 1634 1635 return ns; 1636} 1637 1638static void netdev_queue_get_ownership(struct kobject *kobj, 1639 kuid_t *uid, kgid_t *gid) 1640{ 1641 const struct net *net = netdev_queue_namespace(kobj); 1642 1643 net_ns_get_ownership(net, uid, gid); 1644} 1645 1646static struct kobj_type netdev_queue_ktype __ro_after_init = { 1647 .sysfs_ops = &netdev_queue_sysfs_ops, 1648 .release = netdev_queue_release, 1649 .default_groups = netdev_queue_default_groups, 1650 .namespace = netdev_queue_namespace, 1651 .get_ownership = netdev_queue_get_ownership, 1652}; 1653 1654static int netdev_queue_add_kobject(struct net_device *dev, int index) 1655{ 1656 struct netdev_queue *queue = dev->_tx + index; 1657 struct kobject *kobj = &queue->kobj; 1658 int error = 0; 1659 1660 /* Kobject_put later will trigger netdev_queue_release call 1661 * which decreases dev refcount: Take that reference here 1662 */ 1663 dev_hold_track(queue->dev, &queue->dev_tracker, GFP_KERNEL); 1664 1665 kobj->kset = dev->queues_kset; 1666 error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, 1667 "tx-%u", index); 1668 if (error) 1669 goto err; 1670 1671#ifdef CONFIG_BQL 1672 error = sysfs_create_group(kobj, &dql_group); 1673 if (error) 1674 goto err; 1675#endif 1676 1677 kobject_uevent(kobj, KOBJ_ADD); 1678 return 0; 1679 1680err: 1681 kobject_put(kobj); 1682 return error; 1683} 1684 1685static int tx_queue_change_owner(struct net_device *ndev, int index, 1686 kuid_t kuid, kgid_t kgid) 1687{ 1688 struct netdev_queue *queue = ndev->_tx + index; 1689 struct kobject *kobj = &queue->kobj; 1690 int error; 1691 1692 error = sysfs_change_owner(kobj, kuid, kgid); 1693 if (error) 1694 return error; 1695 1696#ifdef CONFIG_BQL 1697 error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid); 1698#endif 1699 return error; 1700} 1701#endif /* CONFIG_SYSFS */ 1702 1703int 1704netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) 1705{ 1706#ifdef CONFIG_SYSFS 1707 int i; 1708 int error = 0; 1709 1710 /* Tx queue kobjects are allowed to be updated when a device is being 1711 * unregistered, but solely to remove queues from qdiscs. Any path 1712 * adding queues should be fixed. 1713 */ 1714 WARN(dev->reg_state == NETREG_UNREGISTERING && new_num > old_num, 1715 "New queues can't be registered after device unregistration."); 1716 1717 for (i = old_num; i < new_num; i++) { 1718 error = netdev_queue_add_kobject(dev, i); 1719 if (error) { 1720 new_num = old_num; 1721 break; 1722 } 1723 } 1724 1725 while (--i >= new_num) { 1726 struct netdev_queue *queue = dev->_tx + i; 1727 1728 if (!refcount_read(&dev_net(dev)->ns.count)) 1729 queue->kobj.uevent_suppress = 1; 1730#ifdef CONFIG_BQL 1731 sysfs_remove_group(&queue->kobj, &dql_group); 1732#endif 1733 kobject_put(&queue->kobj); 1734 } 1735 1736 return error; 1737#else 1738 return 0; 1739#endif /* CONFIG_SYSFS */ 1740} 1741 1742static int net_tx_queue_change_owner(struct net_device *dev, int num, 1743 kuid_t kuid, kgid_t kgid) 1744{ 1745#ifdef CONFIG_SYSFS 1746 int error = 0; 1747 int i; 1748 1749 for (i = 0; i < num; i++) { 1750 error = tx_queue_change_owner(dev, i, kuid, kgid); 1751 if (error) 1752 break; 1753 } 1754 1755 return error; 1756#else 1757 return 0; 1758#endif /* CONFIG_SYSFS */ 1759} 1760 1761static int register_queue_kobjects(struct net_device *dev) 1762{ 1763 int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; 1764 1765#ifdef CONFIG_SYSFS 1766 dev->queues_kset = kset_create_and_add("queues", 1767 NULL, &dev->dev.kobj); 1768 if (!dev->queues_kset) 1769 return -ENOMEM; 1770 real_rx = dev->real_num_rx_queues; 1771#endif 1772 real_tx = dev->real_num_tx_queues; 1773 1774 error = net_rx_queue_update_kobjects(dev, 0, real_rx); 1775 if (error) 1776 goto error; 1777 rxq = real_rx; 1778 1779 error = netdev_queue_update_kobjects(dev, 0, real_tx); 1780 if (error) 1781 goto error; 1782 txq = real_tx; 1783 1784 return 0; 1785 1786error: 1787 netdev_queue_update_kobjects(dev, txq, 0); 1788 net_rx_queue_update_kobjects(dev, rxq, 0); 1789#ifdef CONFIG_SYSFS 1790 kset_unregister(dev->queues_kset); 1791#endif 1792 return error; 1793} 1794 1795static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid) 1796{ 1797 int error = 0, real_rx = 0, real_tx = 0; 1798 1799#ifdef CONFIG_SYSFS 1800 if (ndev->queues_kset) { 1801 error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid); 1802 if (error) 1803 return error; 1804 } 1805 real_rx = ndev->real_num_rx_queues; 1806#endif 1807 real_tx = ndev->real_num_tx_queues; 1808 1809 error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid); 1810 if (error) 1811 return error; 1812 1813 error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid); 1814 if (error) 1815 return error; 1816 1817 return 0; 1818} 1819 1820static void remove_queue_kobjects(struct net_device *dev) 1821{ 1822 int real_rx = 0, real_tx = 0; 1823 1824#ifdef CONFIG_SYSFS 1825 real_rx = dev->real_num_rx_queues; 1826#endif 1827 real_tx = dev->real_num_tx_queues; 1828 1829 net_rx_queue_update_kobjects(dev, real_rx, 0); 1830 netdev_queue_update_kobjects(dev, real_tx, 0); 1831 1832 dev->real_num_rx_queues = 0; 1833 dev->real_num_tx_queues = 0; 1834#ifdef CONFIG_SYSFS 1835 kset_unregister(dev->queues_kset); 1836#endif 1837} 1838 1839static bool net_current_may_mount(void) 1840{ 1841 struct net *net = current->nsproxy->net_ns; 1842 1843 return ns_capable(net->user_ns, CAP_SYS_ADMIN); 1844} 1845 1846static void *net_grab_current_ns(void) 1847{ 1848 struct net *ns = current->nsproxy->net_ns; 1849#ifdef CONFIG_NET_NS 1850 if (ns) 1851 refcount_inc(&ns->passive); 1852#endif 1853 return ns; 1854} 1855 1856static const void *net_initial_ns(void) 1857{ 1858 return &init_net; 1859} 1860 1861static const void *net_netlink_ns(struct sock *sk) 1862{ 1863 return sock_net(sk); 1864} 1865 1866const struct kobj_ns_type_operations net_ns_type_operations = { 1867 .type = KOBJ_NS_TYPE_NET, 1868 .current_may_mount = net_current_may_mount, 1869 .grab_current_ns = net_grab_current_ns, 1870 .netlink_ns = net_netlink_ns, 1871 .initial_ns = net_initial_ns, 1872 .drop_ns = net_drop_ns, 1873}; 1874EXPORT_SYMBOL_GPL(net_ns_type_operations); 1875 1876static int netdev_uevent(struct device *d, struct kobj_uevent_env *env) 1877{ 1878 struct net_device *dev = to_net_dev(d); 1879 int retval; 1880 1881 /* pass interface to uevent. */ 1882 retval = add_uevent_var(env, "INTERFACE=%s", dev->name); 1883 if (retval) 1884 goto exit; 1885 1886 /* pass ifindex to uevent. 1887 * ifindex is useful as it won't change (interface name may change) 1888 * and is what RtNetlink uses natively. 1889 */ 1890 retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex); 1891 1892exit: 1893 return retval; 1894} 1895 1896/* 1897 * netdev_release -- destroy and free a dead device. 1898 * Called when last reference to device kobject is gone. 1899 */ 1900static void netdev_release(struct device *d) 1901{ 1902 struct net_device *dev = to_net_dev(d); 1903 1904 BUG_ON(dev->reg_state != NETREG_RELEASED); 1905 1906 /* no need to wait for rcu grace period: 1907 * device is dead and about to be freed. 1908 */ 1909 kfree(rcu_access_pointer(dev->ifalias)); 1910 netdev_freemem(dev); 1911} 1912 1913static const void *net_namespace(struct device *d) 1914{ 1915 struct net_device *dev = to_net_dev(d); 1916 1917 return dev_net(dev); 1918} 1919 1920static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid) 1921{ 1922 struct net_device *dev = to_net_dev(d); 1923 const struct net *net = dev_net(dev); 1924 1925 net_ns_get_ownership(net, uid, gid); 1926} 1927 1928static struct class net_class __ro_after_init = { 1929 .name = "net", 1930 .dev_release = netdev_release, 1931 .dev_groups = net_class_groups, 1932 .dev_uevent = netdev_uevent, 1933 .ns_type = &net_ns_type_operations, 1934 .namespace = net_namespace, 1935 .get_ownership = net_get_ownership, 1936}; 1937 1938#ifdef CONFIG_OF 1939static int of_dev_node_match(struct device *dev, const void *data) 1940{ 1941 for (; dev; dev = dev->parent) { 1942 if (dev->of_node == data) 1943 return 1; 1944 } 1945 1946 return 0; 1947} 1948 1949/* 1950 * of_find_net_device_by_node - lookup the net device for the device node 1951 * @np: OF device node 1952 * 1953 * Looks up the net_device structure corresponding with the device node. 1954 * If successful, returns a pointer to the net_device with the embedded 1955 * struct device refcount incremented by one, or NULL on failure. The 1956 * refcount must be dropped when done with the net_device. 1957 */ 1958struct net_device *of_find_net_device_by_node(struct device_node *np) 1959{ 1960 struct device *dev; 1961 1962 dev = class_find_device(&net_class, NULL, np, of_dev_node_match); 1963 if (!dev) 1964 return NULL; 1965 1966 return to_net_dev(dev); 1967} 1968EXPORT_SYMBOL(of_find_net_device_by_node); 1969#endif 1970 1971/* Delete sysfs entries but hold kobject reference until after all 1972 * netdev references are gone. 1973 */ 1974void netdev_unregister_kobject(struct net_device *ndev) 1975{ 1976 struct device *dev = &ndev->dev; 1977 1978 if (!refcount_read(&dev_net(ndev)->ns.count)) 1979 dev_set_uevent_suppress(dev, 1); 1980 1981 kobject_get(&dev->kobj); 1982 1983 remove_queue_kobjects(ndev); 1984 1985 pm_runtime_set_memalloc_noio(dev, false); 1986 1987 device_del(dev); 1988} 1989 1990/* Create sysfs entries for network device. */ 1991int netdev_register_kobject(struct net_device *ndev) 1992{ 1993 struct device *dev = &ndev->dev; 1994 const struct attribute_group **groups = ndev->sysfs_groups; 1995 int error = 0; 1996 1997 device_initialize(dev); 1998 dev->class = &net_class; 1999 dev->platform_data = ndev; 2000 dev->groups = groups; 2001 2002 dev_set_name(dev, "%s", ndev->name); 2003 2004#ifdef CONFIG_SYSFS 2005 /* Allow for a device specific group */ 2006 if (*groups) 2007 groups++; 2008 2009 *groups++ = &netstat_group; 2010 2011 if (wireless_group_needed(ndev)) 2012 *groups++ = &wireless_group; 2013#endif /* CONFIG_SYSFS */ 2014 2015 error = device_add(dev); 2016 if (error) 2017 return error; 2018 2019 error = register_queue_kobjects(ndev); 2020 if (error) { 2021 device_del(dev); 2022 return error; 2023 } 2024 2025 pm_runtime_set_memalloc_noio(dev, true); 2026 2027 return error; 2028} 2029 2030/* Change owner for sysfs entries when moving network devices across network 2031 * namespaces owned by different user namespaces. 2032 */ 2033int netdev_change_owner(struct net_device *ndev, const struct net *net_old, 2034 const struct net *net_new) 2035{ 2036 kuid_t old_uid = GLOBAL_ROOT_UID, new_uid = GLOBAL_ROOT_UID; 2037 kgid_t old_gid = GLOBAL_ROOT_GID, new_gid = GLOBAL_ROOT_GID; 2038 struct device *dev = &ndev->dev; 2039 int error; 2040 2041 net_ns_get_ownership(net_old, &old_uid, &old_gid); 2042 net_ns_get_ownership(net_new, &new_uid, &new_gid); 2043 2044 /* The network namespace was changed but the owning user namespace is 2045 * identical so there's no need to change the owner of sysfs entries. 2046 */ 2047 if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid)) 2048 return 0; 2049 2050 error = device_change_owner(dev, new_uid, new_gid); 2051 if (error) 2052 return error; 2053 2054 error = queue_change_owner(ndev, new_uid, new_gid); 2055 if (error) 2056 return error; 2057 2058 return 0; 2059} 2060 2061int netdev_class_create_file_ns(const struct class_attribute *class_attr, 2062 const void *ns) 2063{ 2064 return class_create_file_ns(&net_class, class_attr, ns); 2065} 2066EXPORT_SYMBOL(netdev_class_create_file_ns); 2067 2068void netdev_class_remove_file_ns(const struct class_attribute *class_attr, 2069 const void *ns) 2070{ 2071 class_remove_file_ns(&net_class, class_attr, ns); 2072} 2073EXPORT_SYMBOL(netdev_class_remove_file_ns); 2074 2075int __init netdev_kobject_init(void) 2076{ 2077 kobj_ns_type_register(&net_ns_type_operations); 2078 return class_register(&net_class); 2079}