drivers/net/team/team.c

   1 /*
   2  * net/drivers/team/team.c - Network team device driver
   3  * Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/rcupdate.h>
  17 #include <linux/errno.h>
  18 #include <linux/ctype.h>
  19 #include <linux/notifier.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/if_arp.h>
  22 #include <linux/socket.h>
  23 #include <linux/etherdevice.h>
  24 #include <linux/rtnetlink.h>
  25 #include <net/rtnetlink.h>
  26 #include <net/genetlink.h>
  27 #include <net/netlink.h>
  28 #include <linux/if_team.h>
  29
  30 #define DRV_NAME "team"
  31
  32
  33 /**********
  34  * Helpers
  35  **********/
  36
  37 #define team_port_exists(dev) (dev->priv_flags & IFF_TEAM_PORT)
  38
  39 static struct team_port *team_port_get_rcu(const struct net_device *dev)
  40 {
  41         struct team_port *port = rcu_dereference(dev->rx_handler_data);
  42
  43         return team_port_exists(dev) ? port : NULL;
  44 }
  45
  46 static struct team_port *team_port_get_rtnl(const struct net_device *dev)
  47 {
  48         struct team_port *port = rtnl_dereference(dev->rx_handler_data);
  49
  50         return team_port_exists(dev) ? port : NULL;
  51 }
  52
  53 /*
  54  * Since the ability to change mac address for open port device is tested in
  55  * team_port_add, this function can be called without control of return value
  56  */
  57 static int __set_port_mac(struct net_device *port_dev,
  58                           const unsigned char *dev_addr)
  59 {
  60         struct sockaddr addr;
  61
  62         memcpy(addr.sa_data, dev_addr, ETH_ALEN);
  63         addr.sa_family = ARPHRD_ETHER;
  64         return dev_set_mac_address(port_dev, &addr);
  65 }
  66
  67 int team_port_set_orig_mac(struct team_port *port)
  68 {
  69         return __set_port_mac(port->dev, port->orig.dev_addr);
  70 }
  71
  72 int team_port_set_team_mac(struct team_port *port)
  73 {
  74         return __set_port_mac(port->dev, port->team->dev->dev_addr);
  75 }
  76 EXPORT_SYMBOL(team_port_set_team_mac);
  77
  78
  79 /*******************
  80  * Options handling
  81  *******************/
  82
  83 void team_options_register(struct team *team, struct team_option *option,
  84                            size_t option_count)
  85 {
  86         int i;
  87
  88         for (i = 0; i < option_count; i++, option++)
  89                 list_add_tail(&option->list, &team->option_list);
  90 }
  91 EXPORT_SYMBOL(team_options_register);
  92
  93 static void __team_options_change_check(struct team *team,
  94                                         struct team_option *changed_option);
  95
  96 static void __team_options_unregister(struct team *team,
  97                                       struct team_option *option,
  98                                       size_t option_count)
  99 {
 100         int i;
 101
 102         for (i = 0; i < option_count; i++, option++)
 103                 list_del(&option->list);
 104 }
 105
 106 void team_options_unregister(struct team *team, struct team_option *option,
 107                              size_t option_count)
 108 {
 109         __team_options_unregister(team, option, option_count);
 110         __team_options_change_check(team, NULL);
 111 }
 112 EXPORT_SYMBOL(team_options_unregister);
 113
 114 static int team_option_get(struct team *team, struct team_option *option,
 115                            void *arg)
 116 {
 117         return option->getter(team, arg);
 118 }
 119
 120 static int team_option_set(struct team *team, struct team_option *option,
 121                            void *arg)
 122 {
 123         int err;
 124
 125         err = option->setter(team, arg);
 126         if (err)
 127                 return err;
 128
 129         __team_options_change_check(team, option);
 130         return err;
 131 }
 132
 133 /****************
 134  * Mode handling
 135  ****************/
 136
 137 static LIST_HEAD(mode_list);
 138 static DEFINE_SPINLOCK(mode_list_lock);
 139
 140 static struct team_mode *__find_mode(const char *kind)
 141 {
 142         struct team_mode *mode;
 143
 144         list_for_each_entry(mode, &mode_list, list) {
 145                 if (strcmp(mode->kind, kind) == 0)
 146                         return mode;
 147         }
 148         return NULL;
 149 }
 150
 151 static bool is_good_mode_name(const char *name)
 152 {
 153         while (*name != '\0') {
 154                 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
 155                         return false;
 156                 name++;
 157         }
 158         return true;
 159 }
 160
 161 int team_mode_register(struct team_mode *mode)
 162 {
 163         int err = 0;
 164
 165         if (!is_good_mode_name(mode->kind) ||
 166             mode->priv_size > TEAM_MODE_PRIV_SIZE)
 167                 return -EINVAL;
 168         spin_lock(&mode_list_lock);
 169         if (__find_mode(mode->kind)) {
 170                 err = -EEXIST;
 171                 goto unlock;
 172         }
 173         list_add_tail(&mode->list, &mode_list);
 174 unlock:
 175         spin_unlock(&mode_list_lock);
 176         return err;
 177 }
 178 EXPORT_SYMBOL(team_mode_register);
 179
 180 int team_mode_unregister(struct team_mode *mode)
 181 {
 182         spin_lock(&mode_list_lock);
 183         list_del_init(&mode->list);
 184         spin_unlock(&mode_list_lock);
 185         return 0;
 186 }
 187 EXPORT_SYMBOL(team_mode_unregister);
 188
 189 static struct team_mode *team_mode_get(const char *kind)
 190 {
 191         struct team_mode *mode;
 192
 193         spin_lock(&mode_list_lock);
 194         mode = __find_mode(kind);
 195         if (!mode) {
 196                 spin_unlock(&mode_list_lock);
 197                 request_module("team-mode-%s", kind);
 198                 spin_lock(&mode_list_lock);
 199                 mode = __find_mode(kind);
 200         }
 201         if (mode)
 202                 if (!try_module_get(mode->owner))
 203                         mode = NULL;
 204
 205         spin_unlock(&mode_list_lock);
 206         return mode;
 207 }
 208
 209 static void team_mode_put(const struct team_mode *mode)
 210 {
 211         module_put(mode->owner);
 212 }
 213
 214 static bool team_dummy_transmit(struct team *team, struct sk_buff *skb)
 215 {
 216         dev_kfree_skb_any(skb);
 217         return false;
 218 }
 219
 220 rx_handler_result_t team_dummy_receive(struct team *team,
 221                                        struct team_port *port,
 222                                        struct sk_buff *skb)
 223 {
 224         return RX_HANDLER_ANOTHER;
 225 }
 226
 227 static void team_adjust_ops(struct team *team)
 228 {
 229         /*
 230          * To avoid checks in rx/tx skb paths, ensure here that non-null and
 231          * correct ops are always set.
 232          */
 233
 234         if (list_empty(&team->port_list) ||
 235             !team->mode || !team->mode->ops->transmit)
 236                 team->ops.transmit = team_dummy_transmit;
 237         else
 238                 team->ops.transmit = team->mode->ops->transmit;
 239
 240         if (list_empty(&team->port_list) ||
 241             !team->mode || !team->mode->ops->receive)
 242                 team->ops.receive = team_dummy_receive;
 243         else
 244                 team->ops.receive = team->mode->ops->receive;
 245 }
 246
 247 /*
 248  * We can benefit from the fact that it's ensured no port is present
 249  * at the time of mode change. Therefore no packets are in fly so there's no
 250  * need to set mode operations in any special way.
 251  */
 252 static int __team_change_mode(struct team *team,
 253                               const struct team_mode *new_mode)
 254 {
 255         /* Check if mode was previously set and do cleanup if so */
 256         if (team->mode) {
 257                 void (*exit_op)(struct team *team) = team->ops.exit;
 258
 259                 /* Clear ops area so no callback is called any longer */
 260                 memset(&team->ops, 0, sizeof(struct team_mode_ops));
 261                 team_adjust_ops(team);
 262
 263                 if (exit_op)
 264                         exit_op(team);
 265                 team_mode_put(team->mode);
 266                 team->mode = NULL;
 267                 /* zero private data area */
 268                 memset(&team->mode_priv, 0,
 269                        sizeof(struct team) - offsetof(struct team, mode_priv));
 270         }
 271
 272         if (!new_mode)
 273                 return 0;
 274
 275         if (new_mode->ops->init) {
 276                 int err;
 277
 278                 err = new_mode->ops->init(team);
 279                 if (err)
 280                         return err;
 281         }
 282
 283         team->mode = new_mode;
 284         memcpy(&team->ops, new_mode->ops, sizeof(struct team_mode_ops));
 285         team_adjust_ops(team);
 286
 287         return 0;
 288 }
 289
 290 static int team_change_mode(struct team *team, const char *kind)
 291 {
 292         struct team_mode *new_mode;
 293         struct net_device *dev = team->dev;
 294         int err;
 295
 296         if (!list_empty(&team->port_list)) {
 297                 netdev_err(dev, "No ports can be present during mode change\n");
 298                 return -EBUSY;
 299         }
 300
 301         if (team->mode && strcmp(team->mode->kind, kind) == 0) {
 302                 netdev_err(dev, "Unable to change to the same mode the team is in\n");
 303                 return -EINVAL;
 304         }
 305
 306         new_mode = team_mode_get(kind);
 307         if (!new_mode) {
 308                 netdev_err(dev, "Mode \"%s\" not found\n", kind);
 309                 return -EINVAL;
 310         }
 311
 312         err = __team_change_mode(team, new_mode);
 313         if (err) {
 314                 netdev_err(dev, "Failed to change to mode \"%s\"\n", kind);
 315                 team_mode_put(new_mode);
 316                 return err;
 317         }
 318
 319         netdev_info(dev, "Mode changed to \"%s\"\n", kind);
 320         return 0;
 321 }
 322
 323
 324 /************************
 325  * Rx path frame handler
 326  ************************/
 327
 328 /* note: already called with rcu_read_lock */
 329 static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
 330 {
 331         struct sk_buff *skb = *pskb;
 332         struct team_port *port;
 333         struct team *team;
 334         rx_handler_result_t res;
 335
 336         skb = skb_share_check(skb, GFP_ATOMIC);
 337         if (!skb)
 338                 return RX_HANDLER_CONSUMED;
 339
 340         *pskb = skb;
 341
 342         port = team_port_get_rcu(skb->dev);
 343         team = port->team;
 344
 345         res = team->ops.receive(team, port, skb);
 346         if (res == RX_HANDLER_ANOTHER) {
 347                 struct team_pcpu_stats *pcpu_stats;
 348
 349                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
 350                 u64_stats_update_begin(&pcpu_stats->syncp);
 351                 pcpu_stats->rx_packets++;
 352                 pcpu_stats->rx_bytes += skb->len;
 353                 if (skb->pkt_type == PACKET_MULTICAST)
 354                         pcpu_stats->rx_multicast++;
 355                 u64_stats_update_end(&pcpu_stats->syncp);
 356
 357                 skb->dev = team->dev;
 358         } else {
 359                 this_cpu_inc(team->pcpu_stats->rx_dropped);
 360         }
 361
 362         return res;
 363 }
 364
 365
 366 /****************
 367  * Port handling
 368  ****************/
 369
 370 static bool team_port_find(const struct team *team,
 371                            const struct team_port *port)
 372 {
 373         struct team_port *cur;
 374
 375         list_for_each_entry(cur, &team->port_list, list)
 376                 if (cur == port)
 377                         return true;
 378         return false;
 379 }
 380
 381 /*
 382  * Add/delete port to the team port list. Write guarded by rtnl_lock.
 383  * Takes care of correct port->index setup (might be racy).
 384  */
 385 static void team_port_list_add_port(struct team *team,
 386                                     struct team_port *port)
 387 {
 388         port->index = team->port_count++;
 389         hlist_add_head_rcu(&port->hlist,
 390                            team_port_index_hash(team, port->index));
 391         list_add_tail_rcu(&port->list, &team->port_list);
 392 }
 393
 394 static void __reconstruct_port_hlist(struct team *team, int rm_index)
 395 {
 396         int i;
 397         struct team_port *port;
 398
 399         for (i = rm_index + 1; i < team->port_count; i++) {
 400                 port = team_get_port_by_index(team, i);
 401                 hlist_del_rcu(&port->hlist);
 402                 port->index--;
 403                 hlist_add_head_rcu(&port->hlist,
 404                                    team_port_index_hash(team, port->index));
 405         }
 406 }
 407
 408 static void team_port_list_del_port(struct team *team,
 409                                    struct team_port *port)
 410 {
 411         int rm_index = port->index;
 412
 413         hlist_del_rcu(&port->hlist);
 414         list_del_rcu(&port->list);
 415         __reconstruct_port_hlist(team, rm_index);
 416         team->port_count--;
 417 }
 418
 419 #define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
 420                             NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
 421                             NETIF_F_HIGHDMA | NETIF_F_LRO)
 422
 423 static void __team_compute_features(struct team *team)
 424 {
 425         struct team_port *port;
 426         u32 vlan_features = TEAM_VLAN_FEATURES;
 427         unsigned short max_hard_header_len = ETH_HLEN;
 428
 429         list_for_each_entry(port, &team->port_list, list) {
 430                 vlan_features = netdev_increment_features(vlan_features,
 431                                         port->dev->vlan_features,
 432                                         TEAM_VLAN_FEATURES);
 433
 434                 if (port->dev->hard_header_len > max_hard_header_len)
 435                         max_hard_header_len = port->dev->hard_header_len;
 436         }
 437
 438         team->dev->vlan_features = vlan_features;
 439         team->dev->hard_header_len = max_hard_header_len;
 440
 441         netdev_change_features(team->dev);
 442 }
 443
 444 static void team_compute_features(struct team *team)
 445 {
 446         spin_lock(&team->lock);
 447         __team_compute_features(team);
 448         spin_unlock(&team->lock);
 449 }
 450
 451 static int team_port_enter(struct team *team, struct team_port *port)
 452 {
 453         int err = 0;
 454
 455         dev_hold(team->dev);
 456         port->dev->priv_flags |= IFF_TEAM_PORT;
 457         if (team->ops.port_enter) {
 458                 err = team->ops.port_enter(team, port);
 459                 if (err) {
 460                         netdev_err(team->dev, "Device %s failed to enter team mode\n",
 461                                    port->dev->name);
 462                         goto err_port_enter;
 463                 }
 464         }
 465
 466         return 0;
 467
 468 err_port_enter:
 469         port->dev->priv_flags &= ~IFF_TEAM_PORT;
 470         dev_put(team->dev);
 471
 472         return err;
 473 }
 474
 475 static void team_port_leave(struct team *team, struct team_port *port)
 476 {
 477         if (team->ops.port_leave)
 478                 team->ops.port_leave(team, port);
 479         port->dev->priv_flags &= ~IFF_TEAM_PORT;
 480         dev_put(team->dev);
 481 }
 482
 483 static void __team_port_change_check(struct team_port *port, bool linkup);
 484
 485 static int team_port_add(struct team *team, struct net_device *port_dev)
 486 {
 487         struct net_device *dev = team->dev;
 488         struct team_port *port;
 489         char *portname = port_dev->name;
 490         int err;
 491
 492         if (port_dev->flags & IFF_LOOPBACK ||
 493             port_dev->type != ARPHRD_ETHER) {
 494                 netdev_err(dev, "Device %s is of an unsupported type\n",
 495                            portname);
 496                 return -EINVAL;
 497         }
 498
 499         if (team_port_exists(port_dev)) {
 500                 netdev_err(dev, "Device %s is already a port "
 501                                 "of a team device\n", portname);
 502                 return -EBUSY;
 503         }
 504
 505         if (port_dev->flags & IFF_UP) {
 506                 netdev_err(dev, "Device %s is up. Set it down before adding it as a team port\n",
 507                            portname);
 508                 return -EBUSY;
 509         }
 510
 511         port = kzalloc(sizeof(struct team_port), GFP_KERNEL);
 512         if (!port)
 513                 return -ENOMEM;
 514
 515         port->dev = port_dev;
 516         port->team = team;
 517
 518         port->orig.mtu = port_dev->mtu;
 519         err = dev_set_mtu(port_dev, dev->mtu);
 520         if (err) {
 521                 netdev_dbg(dev, "Error %d calling dev_set_mtu\n", err);
 522                 goto err_set_mtu;
 523         }
 524
 525         memcpy(port->orig.dev_addr, port_dev->dev_addr, ETH_ALEN);
 526
 527         err = team_port_enter(team, port);
 528         if (err) {
 529                 netdev_err(dev, "Device %s failed to enter team mode\n",
 530                            portname);
 531                 goto err_port_enter;
 532         }
 533
 534         err = dev_open(port_dev);
 535         if (err) {
 536                 netdev_dbg(dev, "Device %s opening failed\n",
 537                            portname);
 538                 goto err_dev_open;
 539         }
 540
 541         err = netdev_set_master(port_dev, dev);
 542         if (err) {
 543                 netdev_err(dev, "Device %s failed to set master\n", portname);
 544                 goto err_set_master;
 545         }
 546
 547         err = netdev_rx_handler_register(port_dev, team_handle_frame,
 548                                          port);
 549         if (err) {
 550                 netdev_err(dev, "Device %s failed to register rx_handler\n",
 551                            portname);
 552                 goto err_handler_register;
 553         }
 554
 555         team_port_list_add_port(team, port);
 556         team_adjust_ops(team);
 557         __team_compute_features(team);
 558         __team_port_change_check(port, !!netif_carrier_ok(port_dev));
 559
 560         netdev_info(dev, "Port device %s added\n", portname);
 561
 562         return 0;
 563
 564 err_handler_register:
 565         netdev_set_master(port_dev, NULL);
 566
 567 err_set_master:
 568         dev_close(port_dev);
 569
 570 err_dev_open:
 571         team_port_leave(team, port);
 572         team_port_set_orig_mac(port);
 573
 574 err_port_enter:
 575         dev_set_mtu(port_dev, port->orig.mtu);
 576
 577 err_set_mtu:
 578         kfree(port);
 579
 580         return err;
 581 }
 582
 583 static int team_port_del(struct team *team, struct net_device *port_dev)
 584 {
 585         struct net_device *dev = team->dev;
 586         struct team_port *port;
 587         char *portname = port_dev->name;
 588
 589         port = team_port_get_rtnl(port_dev);
 590         if (!port || !team_port_find(team, port)) {
 591                 netdev_err(dev, "Device %s does not act as a port of this team\n",
 592                            portname);
 593                 return -ENOENT;
 594         }
 595
 596         __team_port_change_check(port, false);
 597         team_port_list_del_port(team, port);
 598         team_adjust_ops(team);
 599         netdev_rx_handler_unregister(port_dev);
 600         netdev_set_master(port_dev, NULL);
 601         dev_close(port_dev);
 602         team_port_leave(team, port);
 603         team_port_set_orig_mac(port);
 604         dev_set_mtu(port_dev, port->orig.mtu);
 605         synchronize_rcu();
 606         kfree(port);
 607         netdev_info(dev, "Port device %s removed\n", portname);
 608         __team_compute_features(team);
 609
 610         return 0;
 611 }
 612
 613
 614 /*****************
 615  * Net device ops
 616  *****************/
 617
 618 static const char team_no_mode_kind[] = "*NOMODE*";
 619
 620 static int team_mode_option_get(struct team *team, void *arg)
 621 {
 622         const char **str = arg;
 623
 624         *str = team->mode ? team->mode->kind : team_no_mode_kind;
 625         return 0;
 626 }
 627
 628 static int team_mode_option_set(struct team *team, void *arg)
 629 {
 630         const char **str = arg;
 631
 632         return team_change_mode(team, *str);
 633 }
 634
 635 static struct team_option team_options[] = {
 636         {
 637                 .name = "mode",
 638                 .type = TEAM_OPTION_TYPE_STRING,
 639                 .getter = team_mode_option_get,
 640                 .setter = team_mode_option_set,
 641         },
 642 };
 643
 644 static int team_init(struct net_device *dev)
 645 {
 646         struct team *team = netdev_priv(dev);
 647         int i;
 648
 649         team->dev = dev;
 650         spin_lock_init(&team->lock);
 651
 652         team->pcpu_stats = alloc_percpu(struct team_pcpu_stats);
 653         if (!team->pcpu_stats)
 654                 return -ENOMEM;
 655
 656         for (i = 0; i < TEAM_PORT_HASHENTRIES; i++)
 657                 INIT_HLIST_HEAD(&team->port_hlist[i]);
 658         INIT_LIST_HEAD(&team->port_list);
 659
 660         team_adjust_ops(team);
 661
 662         INIT_LIST_HEAD(&team->option_list);
 663         team_options_register(team, team_options, ARRAY_SIZE(team_options));
 664         netif_carrier_off(dev);
 665
 666         return 0;
 667 }
 668
 669 static void team_uninit(struct net_device *dev)
 670 {
 671         struct team *team = netdev_priv(dev);
 672         struct team_port *port;
 673         struct team_port *tmp;
 674
 675         spin_lock(&team->lock);
 676         list_for_each_entry_safe(port, tmp, &team->port_list, list)
 677                 team_port_del(team, port->dev);
 678
 679         __team_change_mode(team, NULL); /* cleanup */
 680         __team_options_unregister(team, team_options, ARRAY_SIZE(team_options));
 681         spin_unlock(&team->lock);
 682 }
 683
 684 static void team_destructor(struct net_device *dev)
 685 {
 686         struct team *team = netdev_priv(dev);
 687
 688         free_percpu(team->pcpu_stats);
 689         free_netdev(dev);
 690 }
 691
 692 static int team_open(struct net_device *dev)
 693 {
 694         netif_carrier_on(dev);
 695         return 0;
 696 }
 697
 698 static int team_close(struct net_device *dev)
 699 {
 700         netif_carrier_off(dev);
 701         return 0;
 702 }
 703
 704 /*
 705  * note: already called with rcu_read_lock
 706  */
 707 static netdev_tx_t team_xmit(struct sk_buff *skb, struct net_device *dev)
 708 {
 709         struct team *team = netdev_priv(dev);
 710         bool tx_success = false;
 711         unsigned int len = skb->len;
 712
 713         tx_success = team->ops.transmit(team, skb);
 714         if (tx_success) {
 715                 struct team_pcpu_stats *pcpu_stats;
 716
 717                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
 718                 u64_stats_update_begin(&pcpu_stats->syncp);
 719                 pcpu_stats->tx_packets++;
 720                 pcpu_stats->tx_bytes += len;
 721                 u64_stats_update_end(&pcpu_stats->syncp);
 722         } else {
 723                 this_cpu_inc(team->pcpu_stats->tx_dropped);
 724         }
 725
 726         return NETDEV_TX_OK;
 727 }
 728
 729 static void team_change_rx_flags(struct net_device *dev, int change)
 730 {
 731         struct team *team = netdev_priv(dev);
 732         struct team_port *port;
 733         int inc;
 734
 735         rcu_read_lock();
 736         list_for_each_entry_rcu(port, &team->port_list, list) {
 737                 if (change & IFF_PROMISC) {
 738                         inc = dev->flags & IFF_PROMISC ? 1 : -1;
 739                         dev_set_promiscuity(port->dev, inc);
 740                 }
 741                 if (change & IFF_ALLMULTI) {
 742                         inc = dev->flags & IFF_ALLMULTI ? 1 : -1;
 743                         dev_set_allmulti(port->dev, inc);
 744                 }
 745         }
 746         rcu_read_unlock();
 747 }
 748
 749 static void team_set_rx_mode(struct net_device *dev)
 750 {
 751         struct team *team = netdev_priv(dev);
 752         struct team_port *port;
 753
 754         rcu_read_lock();
 755         list_for_each_entry_rcu(port, &team->port_list, list) {
 756                 dev_uc_sync(port->dev, dev);
 757                 dev_mc_sync(port->dev, dev);
 758         }
 759         rcu_read_unlock();
 760 }
 761
 762 static int team_set_mac_address(struct net_device *dev, void *p)
 763 {
 764         struct team *team = netdev_priv(dev);
 765         struct team_port *port;
 766         struct sockaddr *addr = p;
 767
 768         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 769         rcu_read_lock();
 770         list_for_each_entry_rcu(port, &team->port_list, list)
 771                 if (team->ops.port_change_mac)
 772                         team->ops.port_change_mac(team, port);
 773         rcu_read_unlock();
 774         return 0;
 775 }
 776
 777 static int team_change_mtu(struct net_device *dev, int new_mtu)
 778 {
 779         struct team *team = netdev_priv(dev);
 780         struct team_port *port;
 781         int err;
 782
 783         /*
 784          * Alhough this is reader, it's guarded by team lock. It's not possible
 785          * to traverse list in reverse under rcu_read_lock
 786          */
 787         spin_lock(&team->lock);
 788         list_for_each_entry(port, &team->port_list, list) {
 789                 err = dev_set_mtu(port->dev, new_mtu);
 790                 if (err) {
 791                         netdev_err(dev, "Device %s failed to change mtu",
 792                                    port->dev->name);
 793                         goto unwind;
 794                 }
 795         }
 796         spin_unlock(&team->lock);
 797
 798         dev->mtu = new_mtu;
 799
 800         return 0;
 801
 802 unwind:
 803         list_for_each_entry_continue_reverse(port, &team->port_list, list)
 804                 dev_set_mtu(port->dev, dev->mtu);
 805         spin_unlock(&team->lock);
 806
 807         return err;
 808 }
 809
 810 static struct rtnl_link_stats64 *
 811 team_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 812 {
 813         struct team *team = netdev_priv(dev);
 814         struct team_pcpu_stats *p;
 815         u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 816         u32 rx_dropped = 0, tx_dropped = 0;
 817         unsigned int start;
 818         int i;
 819
 820         for_each_possible_cpu(i) {
 821                 p = per_cpu_ptr(team->pcpu_stats, i);
 822                 do {
 823                         start = u64_stats_fetch_begin_bh(&p->syncp);
 824                         rx_packets      = p->rx_packets;
 825                         rx_bytes        = p->rx_bytes;
 826                         rx_multicast    = p->rx_multicast;
 827                         tx_packets      = p->tx_packets;
 828                         tx_bytes        = p->tx_bytes;
 829                 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 830
 831                 stats->rx_packets       += rx_packets;
 832                 stats->rx_bytes         += rx_bytes;
 833                 stats->multicast        += rx_multicast;
 834                 stats->tx_packets       += tx_packets;
 835                 stats->tx_bytes         += tx_bytes;
 836                 /*
 837                  * rx_dropped & tx_dropped are u32, updated
 838                  * without syncp protection.
 839                  */
 840                 rx_dropped      += p->rx_dropped;
 841                 tx_dropped      += p->tx_dropped;
 842         }
 843         stats->rx_dropped       = rx_dropped;
 844         stats->tx_dropped       = tx_dropped;
 845         return stats;
 846 }
 847
 848 static void team_vlan_rx_add_vid(struct net_device *dev, uint16_t vid)
 849 {
 850         struct team *team = netdev_priv(dev);
 851         struct team_port *port;
 852
 853         rcu_read_lock();
 854         list_for_each_entry_rcu(port, &team->port_list, list) {
 855                 const struct net_device_ops *ops = port->dev->netdev_ops;
 856
 857                 if (ops->ndo_vlan_rx_add_vid)
 858                         ops->ndo_vlan_rx_add_vid(port->dev, vid);
 859         }
 860         rcu_read_unlock();
 861 }
 862
 863 static void team_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid)
 864 {
 865         struct team *team = netdev_priv(dev);
 866         struct team_port *port;
 867
 868         rcu_read_lock();
 869         list_for_each_entry_rcu(port, &team->port_list, list) {
 870                 const struct net_device_ops *ops = port->dev->netdev_ops;
 871
 872                 if (ops->ndo_vlan_rx_kill_vid)
 873                         ops->ndo_vlan_rx_kill_vid(port->dev, vid);
 874         }
 875         rcu_read_unlock();
 876 }
 877
 878 static int team_add_slave(struct net_device *dev, struct net_device *port_dev)
 879 {
 880         struct team *team = netdev_priv(dev);
 881         int err;
 882
 883         spin_lock(&team->lock);
 884         err = team_port_add(team, port_dev);
 885         spin_unlock(&team->lock);
 886         return err;
 887 }
 888
 889 static int team_del_slave(struct net_device *dev, struct net_device *port_dev)
 890 {
 891         struct team *team = netdev_priv(dev);
 892         int err;
 893
 894         spin_lock(&team->lock);
 895         err = team_port_del(team, port_dev);
 896         spin_unlock(&team->lock);
 897         return err;
 898 }
 899
 900 static const struct net_device_ops team_netdev_ops = {
 901         .ndo_init               = team_init,
 902         .ndo_uninit             = team_uninit,
 903         .ndo_open               = team_open,
 904         .ndo_stop               = team_close,
 905         .ndo_start_xmit         = team_xmit,
 906         .ndo_change_rx_flags    = team_change_rx_flags,
 907         .ndo_set_rx_mode        = team_set_rx_mode,
 908         .ndo_set_mac_address    = team_set_mac_address,
 909         .ndo_change_mtu         = team_change_mtu,
 910         .ndo_get_stats64        = team_get_stats64,
 911         .ndo_vlan_rx_add_vid    = team_vlan_rx_add_vid,
 912         .ndo_vlan_rx_kill_vid   = team_vlan_rx_kill_vid,
 913         .ndo_add_slave          = team_add_slave,
 914         .ndo_del_slave          = team_del_slave,
 915 };
 916
 917
 918 /***********************
 919  * rt netlink interface
 920  ***********************/
 921
 922 static void team_setup(struct net_device *dev)
 923 {
 924         ether_setup(dev);
 925
 926         dev->netdev_ops = &team_netdev_ops;
 927         dev->destructor = team_destructor;
 928         dev->tx_queue_len = 0;
 929         dev->flags |= IFF_MULTICAST;
 930         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 931
 932         /*
 933          * Indicate we support unicast address filtering. That way core won't
 934          * bring us to promisc mode in case a unicast addr is added.
 935          * Let this up to underlay drivers.
 936          */
 937         dev->priv_flags |= IFF_UNICAST_FLT;
 938
 939         dev->features |= NETIF_F_LLTX;
 940         dev->features |= NETIF_F_GRO;
 941         dev->hw_features = NETIF_F_HW_VLAN_TX |
 942                            NETIF_F_HW_VLAN_RX |
 943                            NETIF_F_HW_VLAN_FILTER;
 944
 945         dev->features |= dev->hw_features;
 946 }
 947
 948 static int team_newlink(struct net *src_net, struct net_device *dev,
 949                         struct nlattr *tb[], struct nlattr *data[])
 950 {
 951         int err;
 952
 953         if (tb[IFLA_ADDRESS] == NULL)
 954                 random_ether_addr(dev->dev_addr);
 955
 956         err = register_netdevice(dev);
 957         if (err)
 958                 return err;
 959
 960         return 0;
 961 }
 962
 963 static int team_validate(struct nlattr *tb[], struct nlattr *data[])
 964 {
 965         if (tb[IFLA_ADDRESS]) {
 966                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 967                         return -EINVAL;
 968                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 969                         return -EADDRNOTAVAIL;
 970         }
 971         return 0;
 972 }
 973
 974 static struct rtnl_link_ops team_link_ops __read_mostly = {
 975         .kind           = DRV_NAME,
 976         .priv_size      = sizeof(struct team),
 977         .setup          = team_setup,
 978         .newlink        = team_newlink,
 979         .validate       = team_validate,
 980 };
 981
 982
 983 /***********************************
 984  * Generic netlink custom interface
 985  ***********************************/
 986
 987 static struct genl_family team_nl_family = {
 988         .id             = GENL_ID_GENERATE,
 989         .name           = TEAM_GENL_NAME,
 990         .version        = TEAM_GENL_VERSION,
 991         .maxattr        = TEAM_ATTR_MAX,
 992         .netnsok        = true,
 993 };
 994
 995 static const struct nla_policy team_nl_policy[TEAM_ATTR_MAX + 1] = {
 996         [TEAM_ATTR_UNSPEC]                      = { .type = NLA_UNSPEC, },
 997         [TEAM_ATTR_TEAM_IFINDEX]                = { .type = NLA_U32 },
 998         [TEAM_ATTR_LIST_OPTION]                 = { .type = NLA_NESTED },
 999         [TEAM_ATTR_LIST_PORT]                   = { .type = NLA_NESTED },
1000 };
1001
1002 static const struct nla_policy
1003 team_nl_option_policy[TEAM_ATTR_OPTION_MAX + 1] = {
1004         [TEAM_ATTR_OPTION_UNSPEC]               = { .type = NLA_UNSPEC, },
1005         [TEAM_ATTR_OPTION_NAME] = {
1006                 .type = NLA_STRING,
1007                 .len = TEAM_STRING_MAX_LEN,
1008         },
1009         [TEAM_ATTR_OPTION_CHANGED]              = { .type = NLA_FLAG },
1010         [TEAM_ATTR_OPTION_TYPE]                 = { .type = NLA_U8 },
1011         [TEAM_ATTR_OPTION_DATA] = {
1012                 .type = NLA_BINARY,
1013                 .len = TEAM_STRING_MAX_LEN,
1014         },
1015 };
1016
1017 static int team_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
1018 {
1019         struct sk_buff *msg;
1020         void *hdr;
1021         int err;
1022
1023         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1024         if (!msg)
1025                 return -ENOMEM;
1026
1027         hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
1028                           &team_nl_family, 0, TEAM_CMD_NOOP);
1029         if (IS_ERR(hdr)) {
1030                 err = PTR_ERR(hdr);
1031                 goto err_msg_put;
1032         }
1033
1034         genlmsg_end(msg, hdr);
1035
1036         return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
1037
1038 err_msg_put:
1039         nlmsg_free(msg);
1040
1041         return err;
1042 }
1043
1044 /*
1045  * Netlink cmd functions should be locked by following two functions.
1046  * Since dev gets held here, that ensures dev won't disappear in between.
1047  */
1048 static struct team *team_nl_team_get(struct genl_info *info)
1049 {
1050         struct net *net = genl_info_net(info);
1051         int ifindex;
1052         struct net_device *dev;
1053         struct team *team;
1054
1055         if (!info->attrs[TEAM_ATTR_TEAM_IFINDEX])
1056                 return NULL;
1057
1058         ifindex = nla_get_u32(info->attrs[TEAM_ATTR_TEAM_IFINDEX]);
1059         dev = dev_get_by_index(net, ifindex);
1060         if (!dev || dev->netdev_ops != &team_netdev_ops) {
1061                 if (dev)
1062                         dev_put(dev);
1063                 return NULL;
1064         }
1065
1066         team = netdev_priv(dev);
1067         spin_lock(&team->lock);
1068         return team;
1069 }
1070
1071 static void team_nl_team_put(struct team *team)
1072 {
1073         spin_unlock(&team->lock);
1074         dev_put(team->dev);
1075 }
1076
1077 static int team_nl_send_generic(struct genl_info *info, struct team *team,
1078                                 int (*fill_func)(struct sk_buff *skb,
1079                                                  struct genl_info *info,
1080                                                  int flags, struct team *team))
1081 {
1082         struct sk_buff *skb;
1083         int err;
1084
1085         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1086         if (!skb)
1087                 return -ENOMEM;
1088
1089         err = fill_func(skb, info, NLM_F_ACK, team);
1090         if (err < 0)
1091                 goto err_fill;
1092
1093         err = genlmsg_unicast(genl_info_net(info), skb, info->snd_pid);
1094         return err;
1095
1096 err_fill:
1097         nlmsg_free(skb);
1098         return err;
1099 }
1100
1101 static int team_nl_fill_options_get_changed(struct sk_buff *skb,
1102                                             u32 pid, u32 seq, int flags,
1103                                             struct team *team,
1104                                             struct team_option *changed_option)
1105 {
1106         struct nlattr *option_list;
1107         void *hdr;
1108         struct team_option *option;
1109
1110         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags,
1111                           TEAM_CMD_OPTIONS_GET);
1112         if (IS_ERR(hdr))
1113                 return PTR_ERR(hdr);
1114
1115         NLA_PUT_U32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex);
1116         option_list = nla_nest_start(skb, TEAM_ATTR_LIST_OPTION);
1117         if (!option_list)
1118                 return -EMSGSIZE;
1119
1120         list_for_each_entry(option, &team->option_list, list) {
1121                 struct nlattr *option_item;
1122                 long arg;
1123
1124                 option_item = nla_nest_start(skb, TEAM_ATTR_ITEM_OPTION);
1125                 if (!option_item)
1126                         goto nla_put_failure;
1127                 NLA_PUT_STRING(skb, TEAM_ATTR_OPTION_NAME, option->name);
1128                 if (option == changed_option)
1129                         NLA_PUT_FLAG(skb, TEAM_ATTR_OPTION_CHANGED);
1130                 switch (option->type) {
1131                 case TEAM_OPTION_TYPE_U32:
1132                         NLA_PUT_U8(skb, TEAM_ATTR_OPTION_TYPE, NLA_U32);
1133                         team_option_get(team, option, &arg);
1134                         NLA_PUT_U32(skb, TEAM_ATTR_OPTION_DATA, arg);
1135                         break;
1136                 case TEAM_OPTION_TYPE_STRING:
1137                         NLA_PUT_U8(skb, TEAM_ATTR_OPTION_TYPE, NLA_STRING);
1138                         team_option_get(team, option, &arg);
1139                         NLA_PUT_STRING(skb, TEAM_ATTR_OPTION_DATA,
1140                                        (char *) arg);
1141                         break;
1142                 default:
1143                         BUG();
1144                 }
1145                 nla_nest_end(skb, option_item);
1146         }
1147
1148         nla_nest_end(skb, option_list);
1149         return genlmsg_end(skb, hdr);
1150
1151 nla_put_failure:
1152         genlmsg_cancel(skb, hdr);
1153         return -EMSGSIZE;
1154 }
1155
1156 static int team_nl_fill_options_get(struct sk_buff *skb,
1157                                     struct genl_info *info, int flags,
1158                                     struct team *team)
1159 {
1160         return team_nl_fill_options_get_changed(skb, info->snd_pid,
1161                                                 info->snd_seq, NLM_F_ACK,
1162                                                 team, NULL);
1163 }
1164
1165 static int team_nl_cmd_options_get(struct sk_buff *skb, struct genl_info *info)
1166 {
1167         struct team *team;
1168         int err;
1169
1170         team = team_nl_team_get(info);
1171         if (!team)
1172                 return -EINVAL;
1173
1174         err = team_nl_send_generic(info, team, team_nl_fill_options_get);
1175
1176         team_nl_team_put(team);
1177
1178         return err;
1179 }
1180
1181 static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
1182 {
1183         struct team *team;
1184         int err = 0;
1185         int i;
1186         struct nlattr *nl_option;
1187
1188         team = team_nl_team_get(info);
1189         if (!team)
1190                 return -EINVAL;
1191
1192         err = -EINVAL;
1193         if (!info->attrs[TEAM_ATTR_LIST_OPTION]) {
1194                 err = -EINVAL;
1195                 goto team_put;
1196         }
1197
1198         nla_for_each_nested(nl_option, info->attrs[TEAM_ATTR_LIST_OPTION], i) {
1199                 struct nlattr *mode_attrs[TEAM_ATTR_OPTION_MAX + 1];
1200                 enum team_option_type opt_type;
1201                 struct team_option *option;
1202                 char *opt_name;
1203                 bool opt_found = false;
1204
1205                 if (nla_type(nl_option) != TEAM_ATTR_ITEM_OPTION) {
1206                         err = -EINVAL;
1207                         goto team_put;
1208                 }
1209                 err = nla_parse_nested(mode_attrs, TEAM_ATTR_OPTION_MAX,
1210                                        nl_option, team_nl_option_policy);
1211                 if (err)
1212                         goto team_put;
1213                 if (!mode_attrs[TEAM_ATTR_OPTION_NAME] ||
1214                     !mode_attrs[TEAM_ATTR_OPTION_TYPE] ||
1215                     !mode_attrs[TEAM_ATTR_OPTION_DATA]) {
1216                         err = -EINVAL;
1217                         goto team_put;
1218                 }
1219                 switch (nla_get_u8(mode_attrs[TEAM_ATTR_OPTION_TYPE])) {
1220                 case NLA_U32:
1221                         opt_type = TEAM_OPTION_TYPE_U32;
1222                         break;
1223                 case NLA_STRING:
1224                         opt_type = TEAM_OPTION_TYPE_STRING;
1225                         break;
1226                 default:
1227                         goto team_put;
1228                 }
1229
1230                 opt_name = nla_data(mode_attrs[TEAM_ATTR_OPTION_NAME]);
1231                 list_for_each_entry(option, &team->option_list, list) {
1232                         long arg;
1233                         struct nlattr *opt_data_attr;
1234
1235                         if (option->type != opt_type ||
1236                             strcmp(option->name, opt_name))
1237                                 continue;
1238                         opt_found = true;
1239                         opt_data_attr = mode_attrs[TEAM_ATTR_OPTION_DATA];
1240                         switch (opt_type) {
1241                         case TEAM_OPTION_TYPE_U32:
1242                                 arg = nla_get_u32(opt_data_attr);
1243                                 break;
1244                         case TEAM_OPTION_TYPE_STRING:
1245                                 arg = (long) nla_data(opt_data_attr);
1246                                 break;
1247                         default:
1248                                 BUG();
1249                         }
1250                         err = team_option_set(team, option, &arg);
1251                         if (err)
1252                                 goto team_put;
1253                 }
1254                 if (!opt_found) {
1255                         err = -ENOENT;
1256                         goto team_put;
1257                 }
1258         }
1259
1260 team_put:
1261         team_nl_team_put(team);
1262
1263         return err;
1264 }
1265
1266 static int team_nl_fill_port_list_get_changed(struct sk_buff *skb,
1267                                               u32 pid, u32 seq, int flags,
1268                                               struct team *team,
1269                                               struct team_port *changed_port)
1270 {
1271         struct nlattr *port_list;
1272         void *hdr;
1273         struct team_port *port;
1274
1275         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags,
1276                           TEAM_CMD_PORT_LIST_GET);
1277         if (IS_ERR(hdr))
1278                 return PTR_ERR(hdr);
1279
1280         NLA_PUT_U32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex);
1281         port_list = nla_nest_start(skb, TEAM_ATTR_LIST_PORT);
1282         if (!port_list)
1283                 return -EMSGSIZE;
1284
1285         list_for_each_entry(port, &team->port_list, list) {
1286                 struct nlattr *port_item;
1287
1288                 port_item = nla_nest_start(skb, TEAM_ATTR_ITEM_PORT);
1289                 if (!port_item)
1290                         goto nla_put_failure;
1291                 NLA_PUT_U32(skb, TEAM_ATTR_PORT_IFINDEX, port->dev->ifindex);
1292                 if (port == changed_port)
1293                         NLA_PUT_FLAG(skb, TEAM_ATTR_PORT_CHANGED);
1294                 if (port->linkup)
1295                         NLA_PUT_FLAG(skb, TEAM_ATTR_PORT_LINKUP);
1296                 NLA_PUT_U32(skb, TEAM_ATTR_PORT_SPEED, port->speed);
1297                 NLA_PUT_U8(skb, TEAM_ATTR_PORT_DUPLEX, port->duplex);
1298                 nla_nest_end(skb, port_item);
1299         }
1300
1301         nla_nest_end(skb, port_list);
1302         return genlmsg_end(skb, hdr);
1303
1304 nla_put_failure:
1305         genlmsg_cancel(skb, hdr);
1306         return -EMSGSIZE;
1307 }
1308
1309 static int team_nl_fill_port_list_get(struct sk_buff *skb,
1310                                       struct genl_info *info, int flags,
1311                                       struct team *team)
1312 {
1313         return team_nl_fill_port_list_get_changed(skb, info->snd_pid,
1314                                                   info->snd_seq, NLM_F_ACK,
1315                                                   team, NULL);
1316 }
1317
1318 static int team_nl_cmd_port_list_get(struct sk_buff *skb,
1319                                      struct genl_info *info)
1320 {
1321         struct team *team;
1322         int err;
1323
1324         team = team_nl_team_get(info);
1325         if (!team)
1326                 return -EINVAL;
1327
1328         err = team_nl_send_generic(info, team, team_nl_fill_port_list_get);
1329
1330         team_nl_team_put(team);
1331
1332         return err;
1333 }
1334
1335 static struct genl_ops team_nl_ops[] = {
1336         {
1337                 .cmd = TEAM_CMD_NOOP,
1338                 .doit = team_nl_cmd_noop,
1339                 .policy = team_nl_policy,
1340         },
1341         {
1342                 .cmd = TEAM_CMD_OPTIONS_SET,
1343                 .doit = team_nl_cmd_options_set,
1344                 .policy = team_nl_policy,
1345                 .flags = GENL_ADMIN_PERM,
1346         },
1347         {
1348                 .cmd = TEAM_CMD_OPTIONS_GET,
1349                 .doit = team_nl_cmd_options_get,
1350                 .policy = team_nl_policy,
1351                 .flags = GENL_ADMIN_PERM,
1352         },
1353         {
1354                 .cmd = TEAM_CMD_PORT_LIST_GET,
1355                 .doit = team_nl_cmd_port_list_get,
1356                 .policy = team_nl_policy,
1357                 .flags = GENL_ADMIN_PERM,
1358         },
1359 };
1360
1361 static struct genl_multicast_group team_change_event_mcgrp = {
1362         .name = TEAM_GENL_CHANGE_EVENT_MC_GRP_NAME,
1363 };
1364
1365 static int team_nl_send_event_options_get(struct team *team,
1366                                           struct team_option *changed_option)
1367 {
1368         struct sk_buff *skb;
1369         int err;
1370         struct net *net = dev_net(team->dev);
1371
1372         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1373         if (!skb)
1374                 return -ENOMEM;
1375
1376         err = team_nl_fill_options_get_changed(skb, 0, 0, 0, team,
1377                                                changed_option);
1378         if (err < 0)
1379                 goto err_fill;
1380
1381         err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id,
1382                                       GFP_KERNEL);
1383         return err;
1384
1385 err_fill:
1386         nlmsg_free(skb);
1387         return err;
1388 }
1389
1390 static int team_nl_send_event_port_list_get(struct team_port *port)
1391 {
1392         struct sk_buff *skb;
1393         int err;
1394         struct net *net = dev_net(port->team->dev);
1395
1396         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1397         if (!skb)
1398                 return -ENOMEM;
1399
1400         err = team_nl_fill_port_list_get_changed(skb, 0, 0, 0,
1401                                                  port->team, port);
1402         if (err < 0)
1403                 goto err_fill;
1404
1405         err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id,
1406                                       GFP_KERNEL);
1407         return err;
1408
1409 err_fill:
1410         nlmsg_free(skb);
1411         return err;
1412 }
1413
1414 static int team_nl_init(void)
1415 {
1416         int err;
1417
1418         err = genl_register_family_with_ops(&team_nl_family, team_nl_ops,
1419                                             ARRAY_SIZE(team_nl_ops));
1420         if (err)
1421                 return err;
1422
1423         err = genl_register_mc_group(&team_nl_family, &team_change_event_mcgrp);
1424         if (err)
1425                 goto err_change_event_grp_reg;
1426
1427         return 0;
1428
1429 err_change_event_grp_reg:
1430         genl_unregister_family(&team_nl_family);
1431
1432         return err;
1433 }
1434
1435 static void team_nl_fini(void)
1436 {
1437         genl_unregister_family(&team_nl_family);
1438 }
1439
1440
1441 /******************
1442  * Change checkers
1443  ******************/
1444
1445 static void __team_options_change_check(struct team *team,
1446                                         struct team_option *changed_option)
1447 {
1448         int err;
1449
1450         err = team_nl_send_event_options_get(team, changed_option);
1451         if (err)
1452                 netdev_warn(team->dev, "Failed to send options change via netlink\n");
1453 }
1454
1455 /* rtnl lock is held */
1456 static void __team_port_change_check(struct team_port *port, bool linkup)
1457 {
1458         int err;
1459
1460         if (port->linkup == linkup)
1461                 return;
1462
1463         port->linkup = linkup;
1464         if (linkup) {
1465                 struct ethtool_cmd ecmd;
1466
1467                 err = __ethtool_get_settings(port->dev, &ecmd);
1468                 if (!err) {
1469                         port->speed = ethtool_cmd_speed(&ecmd);
1470                         port->duplex = ecmd.duplex;
1471                         goto send_event;
1472                 }
1473         }
1474         port->speed = 0;
1475         port->duplex = 0;
1476
1477 send_event:
1478         err = team_nl_send_event_port_list_get(port);
1479         if (err)
1480                 netdev_warn(port->team->dev, "Failed to send port change of device %s via netlink\n",
1481                             port->dev->name);
1482
1483 }
1484
1485 static void team_port_change_check(struct team_port *port, bool linkup)
1486 {
1487         struct team *team = port->team;
1488
1489         spin_lock(&team->lock);
1490         __team_port_change_check(port, linkup);
1491         spin_unlock(&team->lock);
1492 }
1493
1494 /************************************
1495  * Net device notifier event handler
1496  ************************************/
1497
1498 static int team_device_event(struct notifier_block *unused,
1499                              unsigned long event, void *ptr)
1500 {
1501         struct net_device *dev = (struct net_device *) ptr;
1502         struct team_port *port;
1503
1504         port = team_port_get_rtnl(dev);
1505         if (!port)
1506                 return NOTIFY_DONE;
1507
1508         switch (event) {
1509         case NETDEV_UP:
1510                 if (netif_carrier_ok(dev))
1511                         team_port_change_check(port, true);
1512         case NETDEV_DOWN:
1513                 team_port_change_check(port, false);
1514         case NETDEV_CHANGE:
1515                 if (netif_running(port->dev))
1516                         team_port_change_check(port,
1517                                                !!netif_carrier_ok(port->dev));
1518                 break;
1519         case NETDEV_UNREGISTER:
1520                 team_del_slave(port->team->dev, dev);
1521                 break;
1522         case NETDEV_FEAT_CHANGE:
1523                 team_compute_features(port->team);
1524                 break;
1525         case NETDEV_CHANGEMTU:
1526                 /* Forbid to change mtu of underlaying device */
1527                 return NOTIFY_BAD;
1528         case NETDEV_PRE_TYPE_CHANGE:
1529                 /* Forbid to change type of underlaying device */
1530                 return NOTIFY_BAD;
1531         }
1532         return NOTIFY_DONE;
1533 }
1534
1535 static struct notifier_block team_notifier_block __read_mostly = {
1536         .notifier_call = team_device_event,
1537 };
1538
1539
1540 /***********************
1541  * Module init and exit
1542  ***********************/
1543
1544 static int __init team_module_init(void)
1545 {
1546         int err;
1547
1548         register_netdevice_notifier(&team_notifier_block);
1549
1550         err = rtnl_link_register(&team_link_ops);
1551         if (err)
1552                 goto err_rtnl_reg;
1553
1554         err = team_nl_init();
1555         if (err)
1556                 goto err_nl_init;
1557
1558         return 0;
1559
1560 err_nl_init:
1561         rtnl_link_unregister(&team_link_ops);
1562
1563 err_rtnl_reg:
1564         unregister_netdevice_notifier(&team_notifier_block);
1565
1566         return err;
1567 }
1568
1569 static void __exit team_module_exit(void)
1570 {
1571         team_nl_fini();
1572         rtnl_link_unregister(&team_link_ops);
1573         unregister_netdevice_notifier(&team_notifier_block);
1574 }
1575
1576 module_init(team_module_init);
1577 module_exit(team_module_exit);
1578
1579 MODULE_LICENSE("GPL v2");
1580 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
1581 MODULE_DESCRIPTION("Ethernet team device driver");
1582 MODULE_ALIAS_RTNL_LINK(DRV_NAME);