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 struct team_option *__team_find_option(struct team *team, const char *opt_name)
  84 {
  85         struct team_option *option;
  86
  87         list_for_each_entry(option, &team->option_list, list) {
  88                 if (strcmp(option->name, opt_name) == 0)
  89                         return option;
  90         }
  91         return NULL;
  92 }
  93
  94 int team_options_register(struct team *team,
  95                           const struct team_option *option,
  96                           size_t option_count)
  97 {
  98         int i;
  99         struct team_option *dst_opts[option_count];
 100         int err;
 101
 102         memset(dst_opts, 0, sizeof(dst_opts));
 103         for (i = 0; i < option_count; i++, option++) {
 104                 struct team_option *dst_opt;
 105
 106                 if (__team_find_option(team, option->name)) {
 107                         err = -EEXIST;
 108                         goto rollback;
 109                 }
 110                 dst_opt = kmalloc(sizeof(*option), GFP_KERNEL);
 111                 if (!dst_opt) {
 112                         err = -ENOMEM;
 113                         goto rollback;
 114                 }
 115                 memcpy(dst_opt, option, sizeof(*option));
 116                 dst_opts[i] = dst_opt;
 117         }
 118
 119         for (i = 0; i < option_count; i++)
 120                 list_add_tail(&dst_opts[i]->list, &team->option_list);
 121
 122         return 0;
 123
 124 rollback:
 125         for (i = 0; i < option_count; i++)
 126                 kfree(dst_opts[i]);
 127
 128         return err;
 129 }
 130
 131 EXPORT_SYMBOL(team_options_register);
 132
 133 static void __team_options_change_check(struct team *team,
 134                                         struct team_option *changed_option);
 135
 136 static void __team_options_unregister(struct team *team,
 137                                       const struct team_option *option,
 138                                       size_t option_count)
 139 {
 140         int i;
 141
 142         for (i = 0; i < option_count; i++, option++) {
 143                 struct team_option *del_opt;
 144
 145                 del_opt = __team_find_option(team, option->name);
 146                 if (del_opt) {
 147                         list_del(&del_opt->list);
 148                         kfree(del_opt);
 149                 }
 150         }
 151 }
 152
 153 void team_options_unregister(struct team *team,
 154                              const struct team_option *option,
 155                              size_t option_count)
 156 {
 157         __team_options_unregister(team, option, option_count);
 158         __team_options_change_check(team, NULL);
 159 }
 160 EXPORT_SYMBOL(team_options_unregister);
 161
 162 static int team_option_get(struct team *team, struct team_option *option,
 163                            void *arg)
 164 {
 165         return option->getter(team, arg);
 166 }
 167
 168 static int team_option_set(struct team *team, struct team_option *option,
 169                            void *arg)
 170 {
 171         int err;
 172
 173         err = option->setter(team, arg);
 174         if (err)
 175                 return err;
 176
 177         __team_options_change_check(team, option);
 178         return err;
 179 }
 180
 181 /****************
 182  * Mode handling
 183  ****************/
 184
 185 static LIST_HEAD(mode_list);
 186 static DEFINE_SPINLOCK(mode_list_lock);
 187
 188 static struct team_mode *__find_mode(const char *kind)
 189 {
 190         struct team_mode *mode;
 191
 192         list_for_each_entry(mode, &mode_list, list) {
 193                 if (strcmp(mode->kind, kind) == 0)
 194                         return mode;
 195         }
 196         return NULL;
 197 }
 198
 199 static bool is_good_mode_name(const char *name)
 200 {
 201         while (*name != '\0') {
 202                 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
 203                         return false;
 204                 name++;
 205         }
 206         return true;
 207 }
 208
 209 int team_mode_register(struct team_mode *mode)
 210 {
 211         int err = 0;
 212
 213         if (!is_good_mode_name(mode->kind) ||
 214             mode->priv_size > TEAM_MODE_PRIV_SIZE)
 215                 return -EINVAL;
 216         spin_lock(&mode_list_lock);
 217         if (__find_mode(mode->kind)) {
 218                 err = -EEXIST;
 219                 goto unlock;
 220         }
 221         list_add_tail(&mode->list, &mode_list);
 222 unlock:
 223         spin_unlock(&mode_list_lock);
 224         return err;
 225 }
 226 EXPORT_SYMBOL(team_mode_register);
 227
 228 int team_mode_unregister(struct team_mode *mode)
 229 {
 230         spin_lock(&mode_list_lock);
 231         list_del_init(&mode->list);
 232         spin_unlock(&mode_list_lock);
 233         return 0;
 234 }
 235 EXPORT_SYMBOL(team_mode_unregister);
 236
 237 static struct team_mode *team_mode_get(const char *kind)
 238 {
 239         struct team_mode *mode;
 240
 241         spin_lock(&mode_list_lock);
 242         mode = __find_mode(kind);
 243         if (!mode) {
 244                 spin_unlock(&mode_list_lock);
 245                 request_module("team-mode-%s", kind);
 246                 spin_lock(&mode_list_lock);
 247                 mode = __find_mode(kind);
 248         }
 249         if (mode)
 250                 if (!try_module_get(mode->owner))
 251                         mode = NULL;
 252
 253         spin_unlock(&mode_list_lock);
 254         return mode;
 255 }
 256
 257 static void team_mode_put(const struct team_mode *mode)
 258 {
 259         module_put(mode->owner);
 260 }
 261
 262 static bool team_dummy_transmit(struct team *team, struct sk_buff *skb)
 263 {
 264         dev_kfree_skb_any(skb);
 265         return false;
 266 }
 267
 268 rx_handler_result_t team_dummy_receive(struct team *team,
 269                                        struct team_port *port,
 270                                        struct sk_buff *skb)
 271 {
 272         return RX_HANDLER_ANOTHER;
 273 }
 274
 275 static void team_adjust_ops(struct team *team)
 276 {
 277         /*
 278          * To avoid checks in rx/tx skb paths, ensure here that non-null and
 279          * correct ops are always set.
 280          */
 281
 282         if (list_empty(&team->port_list) ||
 283             !team->mode || !team->mode->ops->transmit)
 284                 team->ops.transmit = team_dummy_transmit;
 285         else
 286                 team->ops.transmit = team->mode->ops->transmit;
 287
 288         if (list_empty(&team->port_list) ||
 289             !team->mode || !team->mode->ops->receive)
 290                 team->ops.receive = team_dummy_receive;
 291         else
 292                 team->ops.receive = team->mode->ops->receive;
 293 }
 294
 295 /*
 296  * We can benefit from the fact that it's ensured no port is present
 297  * at the time of mode change. Therefore no packets are in fly so there's no
 298  * need to set mode operations in any special way.
 299  */
 300 static int __team_change_mode(struct team *team,
 301                               const struct team_mode *new_mode)
 302 {
 303         /* Check if mode was previously set and do cleanup if so */
 304         if (team->mode) {
 305                 void (*exit_op)(struct team *team) = team->ops.exit;
 306
 307                 /* Clear ops area so no callback is called any longer */
 308                 memset(&team->ops, 0, sizeof(struct team_mode_ops));
 309                 team_adjust_ops(team);
 310
 311                 if (exit_op)
 312                         exit_op(team);
 313                 team_mode_put(team->mode);
 314                 team->mode = NULL;
 315                 /* zero private data area */
 316                 memset(&team->mode_priv, 0,
 317                        sizeof(struct team) - offsetof(struct team, mode_priv));
 318         }
 319
 320         if (!new_mode)
 321                 return 0;
 322
 323         if (new_mode->ops->init) {
 324                 int err;
 325
 326                 err = new_mode->ops->init(team);
 327                 if (err)
 328                         return err;
 329         }
 330
 331         team->mode = new_mode;
 332         memcpy(&team->ops, new_mode->ops, sizeof(struct team_mode_ops));
 333         team_adjust_ops(team);
 334
 335         return 0;
 336 }
 337
 338 static int team_change_mode(struct team *team, const char *kind)
 339 {
 340         struct team_mode *new_mode;
 341         struct net_device *dev = team->dev;
 342         int err;
 343
 344         if (!list_empty(&team->port_list)) {
 345                 netdev_err(dev, "No ports can be present during mode change\n");
 346                 return -EBUSY;
 347         }
 348
 349         if (team->mode && strcmp(team->mode->kind, kind) == 0) {
 350                 netdev_err(dev, "Unable to change to the same mode the team is in\n");
 351                 return -EINVAL;
 352         }
 353
 354         new_mode = team_mode_get(kind);
 355         if (!new_mode) {
 356                 netdev_err(dev, "Mode \"%s\" not found\n", kind);
 357                 return -EINVAL;
 358         }
 359
 360         err = __team_change_mode(team, new_mode);
 361         if (err) {
 362                 netdev_err(dev, "Failed to change to mode \"%s\"\n", kind);
 363                 team_mode_put(new_mode);
 364                 return err;
 365         }
 366
 367         netdev_info(dev, "Mode changed to \"%s\"\n", kind);
 368         return 0;
 369 }
 370
 371
 372 /************************
 373  * Rx path frame handler
 374  ************************/
 375
 376 /* note: already called with rcu_read_lock */
 377 static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
 378 {
 379         struct sk_buff *skb = *pskb;
 380         struct team_port *port;
 381         struct team *team;
 382         rx_handler_result_t res;
 383
 384         skb = skb_share_check(skb, GFP_ATOMIC);
 385         if (!skb)
 386                 return RX_HANDLER_CONSUMED;
 387
 388         *pskb = skb;
 389
 390         port = team_port_get_rcu(skb->dev);
 391         team = port->team;
 392
 393         res = team->ops.receive(team, port, skb);
 394         if (res == RX_HANDLER_ANOTHER) {
 395                 struct team_pcpu_stats *pcpu_stats;
 396
 397                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
 398                 u64_stats_update_begin(&pcpu_stats->syncp);
 399                 pcpu_stats->rx_packets++;
 400                 pcpu_stats->rx_bytes += skb->len;
 401                 if (skb->pkt_type == PACKET_MULTICAST)
 402                         pcpu_stats->rx_multicast++;
 403                 u64_stats_update_end(&pcpu_stats->syncp);
 404
 405                 skb->dev = team->dev;
 406         } else {
 407                 this_cpu_inc(team->pcpu_stats->rx_dropped);
 408         }
 409
 410         return res;
 411 }
 412
 413
 414 /****************
 415  * Port handling
 416  ****************/
 417
 418 static bool team_port_find(const struct team *team,
 419                            const struct team_port *port)
 420 {
 421         struct team_port *cur;
 422
 423         list_for_each_entry(cur, &team->port_list, list)
 424                 if (cur == port)
 425                         return true;
 426         return false;
 427 }
 428
 429 /*
 430  * Add/delete port to the team port list. Write guarded by rtnl_lock.
 431  * Takes care of correct port->index setup (might be racy).
 432  */
 433 static void team_port_list_add_port(struct team *team,
 434                                     struct team_port *port)
 435 {
 436         port->index = team->port_count++;
 437         hlist_add_head_rcu(&port->hlist,
 438                            team_port_index_hash(team, port->index));
 439         list_add_tail_rcu(&port->list, &team->port_list);
 440 }
 441
 442 static void __reconstruct_port_hlist(struct team *team, int rm_index)
 443 {
 444         int i;
 445         struct team_port *port;
 446
 447         for (i = rm_index + 1; i < team->port_count; i++) {
 448                 port = team_get_port_by_index(team, i);
 449                 hlist_del_rcu(&port->hlist);
 450                 port->index--;
 451                 hlist_add_head_rcu(&port->hlist,
 452                                    team_port_index_hash(team, port->index));
 453         }
 454 }
 455
 456 static void team_port_list_del_port(struct team *team,
 457                                    struct team_port *port)
 458 {
 459         int rm_index = port->index;
 460
 461         hlist_del_rcu(&port->hlist);
 462         list_del_rcu(&port->list);
 463         __reconstruct_port_hlist(team, rm_index);
 464         team->port_count--;
 465 }
 466
 467 #define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
 468                             NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
 469                             NETIF_F_HIGHDMA | NETIF_F_LRO)
 470
 471 static void __team_compute_features(struct team *team)
 472 {
 473         struct team_port *port;
 474         u32 vlan_features = TEAM_VLAN_FEATURES;
 475         unsigned short max_hard_header_len = ETH_HLEN;
 476
 477         list_for_each_entry(port, &team->port_list, list) {
 478                 vlan_features = netdev_increment_features(vlan_features,
 479                                         port->dev->vlan_features,
 480                                         TEAM_VLAN_FEATURES);
 481
 482                 if (port->dev->hard_header_len > max_hard_header_len)
 483                         max_hard_header_len = port->dev->hard_header_len;
 484         }
 485
 486         team->dev->vlan_features = vlan_features;
 487         team->dev->hard_header_len = max_hard_header_len;
 488
 489         netdev_change_features(team->dev);
 490 }
 491
 492 static void team_compute_features(struct team *team)
 493 {
 494         mutex_lock(&team->lock);
 495         __team_compute_features(team);
 496         mutex_unlock(&team->lock);
 497 }
 498
 499 static int team_port_enter(struct team *team, struct team_port *port)
 500 {
 501         int err = 0;
 502
 503         dev_hold(team->dev);
 504         port->dev->priv_flags |= IFF_TEAM_PORT;
 505         if (team->ops.port_enter) {
 506                 err = team->ops.port_enter(team, port);
 507                 if (err) {
 508                         netdev_err(team->dev, "Device %s failed to enter team mode\n",
 509                                    port->dev->name);
 510                         goto err_port_enter;
 511                 }
 512         }
 513
 514         return 0;
 515
 516 err_port_enter:
 517         port->dev->priv_flags &= ~IFF_TEAM_PORT;
 518         dev_put(team->dev);
 519
 520         return err;
 521 }
 522
 523 static void team_port_leave(struct team *team, struct team_port *port)
 524 {
 525         if (team->ops.port_leave)
 526                 team->ops.port_leave(team, port);
 527         port->dev->priv_flags &= ~IFF_TEAM_PORT;
 528         dev_put(team->dev);
 529 }
 530
 531 static void __team_port_change_check(struct team_port *port, bool linkup);
 532
 533 static int team_port_add(struct team *team, struct net_device *port_dev)
 534 {
 535         struct net_device *dev = team->dev;
 536         struct team_port *port;
 537         char *portname = port_dev->name;
 538         int err;
 539
 540         if (port_dev->flags & IFF_LOOPBACK ||
 541             port_dev->type != ARPHRD_ETHER) {
 542                 netdev_err(dev, "Device %s is of an unsupported type\n",
 543                            portname);
 544                 return -EINVAL;
 545         }
 546
 547         if (team_port_exists(port_dev)) {
 548                 netdev_err(dev, "Device %s is already a port "
 549                                 "of a team device\n", portname);
 550                 return -EBUSY;
 551         }
 552
 553         if (port_dev->flags & IFF_UP) {
 554                 netdev_err(dev, "Device %s is up. Set it down before adding it as a team port\n",
 555                            portname);
 556                 return -EBUSY;
 557         }
 558
 559         port = kzalloc(sizeof(struct team_port), GFP_KERNEL);
 560         if (!port)
 561                 return -ENOMEM;
 562
 563         port->dev = port_dev;
 564         port->team = team;
 565
 566         port->orig.mtu = port_dev->mtu;
 567         err = dev_set_mtu(port_dev, dev->mtu);
 568         if (err) {
 569                 netdev_dbg(dev, "Error %d calling dev_set_mtu\n", err);
 570                 goto err_set_mtu;
 571         }
 572
 573         memcpy(port->orig.dev_addr, port_dev->dev_addr, ETH_ALEN);
 574
 575         err = team_port_enter(team, port);
 576         if (err) {
 577                 netdev_err(dev, "Device %s failed to enter team mode\n",
 578                            portname);
 579                 goto err_port_enter;
 580         }
 581
 582         err = dev_open(port_dev);
 583         if (err) {
 584                 netdev_dbg(dev, "Device %s opening failed\n",
 585                            portname);
 586                 goto err_dev_open;
 587         }
 588
 589         err = netdev_set_master(port_dev, dev);
 590         if (err) {
 591                 netdev_err(dev, "Device %s failed to set master\n", portname);
 592                 goto err_set_master;
 593         }
 594
 595         err = netdev_rx_handler_register(port_dev, team_handle_frame,
 596                                          port);
 597         if (err) {
 598                 netdev_err(dev, "Device %s failed to register rx_handler\n",
 599                            portname);
 600                 goto err_handler_register;
 601         }
 602
 603         team_port_list_add_port(team, port);
 604         team_adjust_ops(team);
 605         __team_compute_features(team);
 606         __team_port_change_check(port, !!netif_carrier_ok(port_dev));
 607
 608         netdev_info(dev, "Port device %s added\n", portname);
 609
 610         return 0;
 611
 612 err_handler_register:
 613         netdev_set_master(port_dev, NULL);
 614
 615 err_set_master:
 616         dev_close(port_dev);
 617
 618 err_dev_open:
 619         team_port_leave(team, port);
 620         team_port_set_orig_mac(port);
 621
 622 err_port_enter:
 623         dev_set_mtu(port_dev, port->orig.mtu);
 624
 625 err_set_mtu:
 626         kfree(port);
 627
 628         return err;
 629 }
 630
 631 static int team_port_del(struct team *team, struct net_device *port_dev)
 632 {
 633         struct net_device *dev = team->dev;
 634         struct team_port *port;
 635         char *portname = port_dev->name;
 636
 637         port = team_port_get_rtnl(port_dev);
 638         if (!port || !team_port_find(team, port)) {
 639                 netdev_err(dev, "Device %s does not act as a port of this team\n",
 640                            portname);
 641                 return -ENOENT;
 642         }
 643
 644         __team_port_change_check(port, false);
 645         team_port_list_del_port(team, port);
 646         team_adjust_ops(team);
 647         netdev_rx_handler_unregister(port_dev);
 648         netdev_set_master(port_dev, NULL);
 649         dev_close(port_dev);
 650         team_port_leave(team, port);
 651         team_port_set_orig_mac(port);
 652         dev_set_mtu(port_dev, port->orig.mtu);
 653         synchronize_rcu();
 654         kfree(port);
 655         netdev_info(dev, "Port device %s removed\n", portname);
 656         __team_compute_features(team);
 657
 658         return 0;
 659 }
 660
 661
 662 /*****************
 663  * Net device ops
 664  *****************/
 665
 666 static const char team_no_mode_kind[] = "*NOMODE*";
 667
 668 static int team_mode_option_get(struct team *team, void *arg)
 669 {
 670         const char **str = arg;
 671
 672         *str = team->mode ? team->mode->kind : team_no_mode_kind;
 673         return 0;
 674 }
 675
 676 static int team_mode_option_set(struct team *team, void *arg)
 677 {
 678         const char **str = arg;
 679
 680         return team_change_mode(team, *str);
 681 }
 682
 683 static const struct team_option team_options[] = {
 684         {
 685                 .name = "mode",
 686                 .type = TEAM_OPTION_TYPE_STRING,
 687                 .getter = team_mode_option_get,
 688                 .setter = team_mode_option_set,
 689         },
 690 };
 691
 692 static int team_init(struct net_device *dev)
 693 {
 694         struct team *team = netdev_priv(dev);
 695         int i;
 696         int err;
 697
 698         team->dev = dev;
 699         mutex_init(&team->lock);
 700
 701         team->pcpu_stats = alloc_percpu(struct team_pcpu_stats);
 702         if (!team->pcpu_stats)
 703                 return -ENOMEM;
 704
 705         for (i = 0; i < TEAM_PORT_HASHENTRIES; i++)
 706                 INIT_HLIST_HEAD(&team->port_hlist[i]);
 707         INIT_LIST_HEAD(&team->port_list);
 708
 709         team_adjust_ops(team);
 710
 711         INIT_LIST_HEAD(&team->option_list);
 712         err = team_options_register(team, team_options, ARRAY_SIZE(team_options));
 713         if (err)
 714                 goto err_options_register;
 715         netif_carrier_off(dev);
 716
 717         return 0;
 718
 719 err_options_register:
 720         free_percpu(team->pcpu_stats);
 721
 722         return err;
 723 }
 724
 725 static void team_uninit(struct net_device *dev)
 726 {
 727         struct team *team = netdev_priv(dev);
 728         struct team_port *port;
 729         struct team_port *tmp;
 730
 731         mutex_lock(&team->lock);
 732         list_for_each_entry_safe(port, tmp, &team->port_list, list)
 733                 team_port_del(team, port->dev);
 734
 735         __team_change_mode(team, NULL); /* cleanup */
 736         __team_options_unregister(team, team_options, ARRAY_SIZE(team_options));
 737         mutex_unlock(&team->lock);
 738 }
 739
 740 static void team_destructor(struct net_device *dev)
 741 {
 742         struct team *team = netdev_priv(dev);
 743
 744         free_percpu(team->pcpu_stats);
 745         free_netdev(dev);
 746 }
 747
 748 static int team_open(struct net_device *dev)
 749 {
 750         netif_carrier_on(dev);
 751         return 0;
 752 }
 753
 754 static int team_close(struct net_device *dev)
 755 {
 756         netif_carrier_off(dev);
 757         return 0;
 758 }
 759
 760 /*
 761  * note: already called with rcu_read_lock
 762  */
 763 static netdev_tx_t team_xmit(struct sk_buff *skb, struct net_device *dev)
 764 {
 765         struct team *team = netdev_priv(dev);
 766         bool tx_success = false;
 767         unsigned int len = skb->len;
 768
 769         tx_success = team->ops.transmit(team, skb);
 770         if (tx_success) {
 771                 struct team_pcpu_stats *pcpu_stats;
 772
 773                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
 774                 u64_stats_update_begin(&pcpu_stats->syncp);
 775                 pcpu_stats->tx_packets++;
 776                 pcpu_stats->tx_bytes += len;
 777                 u64_stats_update_end(&pcpu_stats->syncp);
 778         } else {
 779                 this_cpu_inc(team->pcpu_stats->tx_dropped);
 780         }
 781
 782         return NETDEV_TX_OK;
 783 }
 784
 785 static void team_change_rx_flags(struct net_device *dev, int change)
 786 {
 787         struct team *team = netdev_priv(dev);
 788         struct team_port *port;
 789         int inc;
 790
 791         rcu_read_lock();
 792         list_for_each_entry_rcu(port, &team->port_list, list) {
 793                 if (change & IFF_PROMISC) {
 794                         inc = dev->flags & IFF_PROMISC ? 1 : -1;
 795                         dev_set_promiscuity(port->dev, inc);
 796                 }
 797                 if (change & IFF_ALLMULTI) {
 798                         inc = dev->flags & IFF_ALLMULTI ? 1 : -1;
 799                         dev_set_allmulti(port->dev, inc);
 800                 }
 801         }
 802         rcu_read_unlock();
 803 }
 804
 805 static void team_set_rx_mode(struct net_device *dev)
 806 {
 807         struct team *team = netdev_priv(dev);
 808         struct team_port *port;
 809
 810         rcu_read_lock();
 811         list_for_each_entry_rcu(port, &team->port_list, list) {
 812                 dev_uc_sync(port->dev, dev);
 813                 dev_mc_sync(port->dev, dev);
 814         }
 815         rcu_read_unlock();
 816 }
 817
 818 static int team_set_mac_address(struct net_device *dev, void *p)
 819 {
 820         struct team *team = netdev_priv(dev);
 821         struct team_port *port;
 822         struct sockaddr *addr = p;
 823
 824         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 825         rcu_read_lock();
 826         list_for_each_entry_rcu(port, &team->port_list, list)
 827                 if (team->ops.port_change_mac)
 828                         team->ops.port_change_mac(team, port);
 829         rcu_read_unlock();
 830         return 0;
 831 }
 832
 833 static int team_change_mtu(struct net_device *dev, int new_mtu)
 834 {
 835         struct team *team = netdev_priv(dev);
 836         struct team_port *port;
 837         int err;
 838
 839         /*
 840          * Alhough this is reader, it's guarded by team lock. It's not possible
 841          * to traverse list in reverse under rcu_read_lock
 842          */
 843         mutex_lock(&team->lock);
 844         list_for_each_entry(port, &team->port_list, list) {
 845                 err = dev_set_mtu(port->dev, new_mtu);
 846                 if (err) {
 847                         netdev_err(dev, "Device %s failed to change mtu",
 848                                    port->dev->name);
 849                         goto unwind;
 850                 }
 851         }
 852         mutex_unlock(&team->lock);
 853
 854         dev->mtu = new_mtu;
 855
 856         return 0;
 857
 858 unwind:
 859         list_for_each_entry_continue_reverse(port, &team->port_list, list)
 860                 dev_set_mtu(port->dev, dev->mtu);
 861         mutex_unlock(&team->lock);
 862
 863         return err;
 864 }
 865
 866 static struct rtnl_link_stats64 *
 867 team_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 868 {
 869         struct team *team = netdev_priv(dev);
 870         struct team_pcpu_stats *p;
 871         u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 872         u32 rx_dropped = 0, tx_dropped = 0;
 873         unsigned int start;
 874         int i;
 875
 876         for_each_possible_cpu(i) {
 877                 p = per_cpu_ptr(team->pcpu_stats, i);
 878                 do {
 879                         start = u64_stats_fetch_begin_bh(&p->syncp);
 880                         rx_packets      = p->rx_packets;
 881                         rx_bytes        = p->rx_bytes;
 882                         rx_multicast    = p->rx_multicast;
 883                         tx_packets      = p->tx_packets;
 884                         tx_bytes        = p->tx_bytes;
 885                 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 886
 887                 stats->rx_packets       += rx_packets;
 888                 stats->rx_bytes         += rx_bytes;
 889                 stats->multicast        += rx_multicast;
 890                 stats->tx_packets       += tx_packets;
 891                 stats->tx_bytes         += tx_bytes;
 892                 /*
 893                  * rx_dropped & tx_dropped are u32, updated
 894                  * without syncp protection.
 895                  */
 896                 rx_dropped      += p->rx_dropped;
 897                 tx_dropped      += p->tx_dropped;
 898         }
 899         stats->rx_dropped       = rx_dropped;
 900         stats->tx_dropped       = tx_dropped;
 901         return stats;
 902 }
 903
 904 static void team_vlan_rx_add_vid(struct net_device *dev, uint16_t vid)
 905 {
 906         struct team *team = netdev_priv(dev);
 907         struct team_port *port;
 908
 909         rcu_read_lock();
 910         list_for_each_entry_rcu(port, &team->port_list, list) {
 911                 const struct net_device_ops *ops = port->dev->netdev_ops;
 912
 913                 if (ops->ndo_vlan_rx_add_vid)
 914                         ops->ndo_vlan_rx_add_vid(port->dev, vid);
 915         }
 916         rcu_read_unlock();
 917 }
 918
 919 static void team_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid)
 920 {
 921         struct team *team = netdev_priv(dev);
 922         struct team_port *port;
 923
 924         rcu_read_lock();
 925         list_for_each_entry_rcu(port, &team->port_list, list) {
 926                 const struct net_device_ops *ops = port->dev->netdev_ops;
 927
 928                 if (ops->ndo_vlan_rx_kill_vid)
 929                         ops->ndo_vlan_rx_kill_vid(port->dev, vid);
 930         }
 931         rcu_read_unlock();
 932 }
 933
 934 static int team_add_slave(struct net_device *dev, struct net_device *port_dev)
 935 {
 936         struct team *team = netdev_priv(dev);
 937         int err;
 938
 939         mutex_lock(&team->lock);
 940         err = team_port_add(team, port_dev);
 941         mutex_unlock(&team->lock);
 942         return err;
 943 }
 944
 945 static int team_del_slave(struct net_device *dev, struct net_device *port_dev)
 946 {
 947         struct team *team = netdev_priv(dev);
 948         int err;
 949
 950         mutex_lock(&team->lock);
 951         err = team_port_del(team, port_dev);
 952         mutex_unlock(&team->lock);
 953         return err;
 954 }
 955
 956 static const struct net_device_ops team_netdev_ops = {
 957         .ndo_init               = team_init,
 958         .ndo_uninit             = team_uninit,
 959         .ndo_open               = team_open,
 960         .ndo_stop               = team_close,
 961         .ndo_start_xmit         = team_xmit,
 962         .ndo_change_rx_flags    = team_change_rx_flags,
 963         .ndo_set_rx_mode        = team_set_rx_mode,
 964         .ndo_set_mac_address    = team_set_mac_address,
 965         .ndo_change_mtu         = team_change_mtu,
 966         .ndo_get_stats64        = team_get_stats64,
 967         .ndo_vlan_rx_add_vid    = team_vlan_rx_add_vid,
 968         .ndo_vlan_rx_kill_vid   = team_vlan_rx_kill_vid,
 969         .ndo_add_slave          = team_add_slave,
 970         .ndo_del_slave          = team_del_slave,
 971 };
 972
 973
 974 /***********************
 975  * rt netlink interface
 976  ***********************/
 977
 978 static void team_setup(struct net_device *dev)
 979 {
 980         ether_setup(dev);
 981
 982         dev->netdev_ops = &team_netdev_ops;
 983         dev->destructor = team_destructor;
 984         dev->tx_queue_len = 0;
 985         dev->flags |= IFF_MULTICAST;
 986         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
 987
 988         /*
 989          * Indicate we support unicast address filtering. That way core won't
 990          * bring us to promisc mode in case a unicast addr is added.
 991          * Let this up to underlay drivers.
 992          */
 993         dev->priv_flags |= IFF_UNICAST_FLT;
 994
 995         dev->features |= NETIF_F_LLTX;
 996         dev->features |= NETIF_F_GRO;
 997         dev->hw_features = NETIF_F_HW_VLAN_TX |
 998                            NETIF_F_HW_VLAN_RX |
 999                            NETIF_F_HW_VLAN_FILTER;
1000
1001         dev->features |= dev->hw_features;
1002 }
1003
1004 static int team_newlink(struct net *src_net, struct net_device *dev,
1005                         struct nlattr *tb[], struct nlattr *data[])
1006 {
1007         int err;
1008
1009         if (tb[IFLA_ADDRESS] == NULL)
1010                 random_ether_addr(dev->dev_addr);
1011
1012         err = register_netdevice(dev);
1013         if (err)
1014                 return err;
1015
1016         return 0;
1017 }
1018
1019 static int team_validate(struct nlattr *tb[], struct nlattr *data[])
1020 {
1021         if (tb[IFLA_ADDRESS]) {
1022                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1023                         return -EINVAL;
1024                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1025                         return -EADDRNOTAVAIL;
1026         }
1027         return 0;
1028 }
1029
1030 static struct rtnl_link_ops team_link_ops __read_mostly = {
1031         .kind           = DRV_NAME,
1032         .priv_size      = sizeof(struct team),
1033         .setup          = team_setup,
1034         .newlink        = team_newlink,
1035         .validate       = team_validate,
1036 };
1037
1038
1039 /***********************************
1040  * Generic netlink custom interface
1041  ***********************************/
1042
1043 static struct genl_family team_nl_family = {
1044         .id             = GENL_ID_GENERATE,
1045         .name           = TEAM_GENL_NAME,
1046         .version        = TEAM_GENL_VERSION,
1047         .maxattr        = TEAM_ATTR_MAX,
1048         .netnsok        = true,
1049 };
1050
1051 static const struct nla_policy team_nl_policy[TEAM_ATTR_MAX + 1] = {
1052         [TEAM_ATTR_UNSPEC]                      = { .type = NLA_UNSPEC, },
1053         [TEAM_ATTR_TEAM_IFINDEX]                = { .type = NLA_U32 },
1054         [TEAM_ATTR_LIST_OPTION]                 = { .type = NLA_NESTED },
1055         [TEAM_ATTR_LIST_PORT]                   = { .type = NLA_NESTED },
1056 };
1057
1058 static const struct nla_policy
1059 team_nl_option_policy[TEAM_ATTR_OPTION_MAX + 1] = {
1060         [TEAM_ATTR_OPTION_UNSPEC]               = { .type = NLA_UNSPEC, },
1061         [TEAM_ATTR_OPTION_NAME] = {
1062                 .type = NLA_STRING,
1063                 .len = TEAM_STRING_MAX_LEN,
1064         },
1065         [TEAM_ATTR_OPTION_CHANGED]              = { .type = NLA_FLAG },
1066         [TEAM_ATTR_OPTION_TYPE]                 = { .type = NLA_U8 },
1067         [TEAM_ATTR_OPTION_DATA] = {
1068                 .type = NLA_BINARY,
1069                 .len = TEAM_STRING_MAX_LEN,
1070         },
1071 };
1072
1073 static int team_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
1074 {
1075         struct sk_buff *msg;
1076         void *hdr;
1077         int err;
1078
1079         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1080         if (!msg)
1081                 return -ENOMEM;
1082
1083         hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
1084                           &team_nl_family, 0, TEAM_CMD_NOOP);
1085         if (IS_ERR(hdr)) {
1086                 err = PTR_ERR(hdr);
1087                 goto err_msg_put;
1088         }
1089
1090         genlmsg_end(msg, hdr);
1091
1092         return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
1093
1094 err_msg_put:
1095         nlmsg_free(msg);
1096
1097         return err;
1098 }
1099
1100 /*
1101  * Netlink cmd functions should be locked by following two functions.
1102  * Since dev gets held here, that ensures dev won't disappear in between.
1103  */
1104 static struct team *team_nl_team_get(struct genl_info *info)
1105 {
1106         struct net *net = genl_info_net(info);
1107         int ifindex;
1108         struct net_device *dev;
1109         struct team *team;
1110
1111         if (!info->attrs[TEAM_ATTR_TEAM_IFINDEX])
1112                 return NULL;
1113
1114         ifindex = nla_get_u32(info->attrs[TEAM_ATTR_TEAM_IFINDEX]);
1115         dev = dev_get_by_index(net, ifindex);
1116         if (!dev || dev->netdev_ops != &team_netdev_ops) {
1117                 if (dev)
1118                         dev_put(dev);
1119                 return NULL;
1120         }
1121
1122         team = netdev_priv(dev);
1123         mutex_lock(&team->lock);
1124         return team;
1125 }
1126
1127 static void team_nl_team_put(struct team *team)
1128 {
1129         mutex_unlock(&team->lock);
1130         dev_put(team->dev);
1131 }
1132
1133 static int team_nl_send_generic(struct genl_info *info, struct team *team,
1134                                 int (*fill_func)(struct sk_buff *skb,
1135                                                  struct genl_info *info,
1136                                                  int flags, struct team *team))
1137 {
1138         struct sk_buff *skb;
1139         int err;
1140
1141         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1142         if (!skb)
1143                 return -ENOMEM;
1144
1145         err = fill_func(skb, info, NLM_F_ACK, team);
1146         if (err < 0)
1147                 goto err_fill;
1148
1149         err = genlmsg_unicast(genl_info_net(info), skb, info->snd_pid);
1150         return err;
1151
1152 err_fill:
1153         nlmsg_free(skb);
1154         return err;
1155 }
1156
1157 static int team_nl_fill_options_get_changed(struct sk_buff *skb,
1158                                             u32 pid, u32 seq, int flags,
1159                                             struct team *team,
1160                                             struct team_option *changed_option)
1161 {
1162         struct nlattr *option_list;
1163         void *hdr;
1164         struct team_option *option;
1165
1166         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags,
1167                           TEAM_CMD_OPTIONS_GET);
1168         if (IS_ERR(hdr))
1169                 return PTR_ERR(hdr);
1170
1171         NLA_PUT_U32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex);
1172         option_list = nla_nest_start(skb, TEAM_ATTR_LIST_OPTION);
1173         if (!option_list)
1174                 return -EMSGSIZE;
1175
1176         list_for_each_entry(option, &team->option_list, list) {
1177                 struct nlattr *option_item;
1178                 long arg;
1179
1180                 option_item = nla_nest_start(skb, TEAM_ATTR_ITEM_OPTION);
1181                 if (!option_item)
1182                         goto nla_put_failure;
1183                 NLA_PUT_STRING(skb, TEAM_ATTR_OPTION_NAME, option->name);
1184                 if (option == changed_option)
1185                         NLA_PUT_FLAG(skb, TEAM_ATTR_OPTION_CHANGED);
1186                 switch (option->type) {
1187                 case TEAM_OPTION_TYPE_U32:
1188                         NLA_PUT_U8(skb, TEAM_ATTR_OPTION_TYPE, NLA_U32);
1189                         team_option_get(team, option, &arg);
1190                         NLA_PUT_U32(skb, TEAM_ATTR_OPTION_DATA, arg);
1191                         break;
1192                 case TEAM_OPTION_TYPE_STRING:
1193                         NLA_PUT_U8(skb, TEAM_ATTR_OPTION_TYPE, NLA_STRING);
1194                         team_option_get(team, option, &arg);
1195                         NLA_PUT_STRING(skb, TEAM_ATTR_OPTION_DATA,
1196                                        (char *) arg);
1197                         break;
1198                 default:
1199                         BUG();
1200                 }
1201                 nla_nest_end(skb, option_item);
1202         }
1203
1204         nla_nest_end(skb, option_list);
1205         return genlmsg_end(skb, hdr);
1206
1207 nla_put_failure:
1208         genlmsg_cancel(skb, hdr);
1209         return -EMSGSIZE;
1210 }
1211
1212 static int team_nl_fill_options_get(struct sk_buff *skb,
1213                                     struct genl_info *info, int flags,
1214                                     struct team *team)
1215 {
1216         return team_nl_fill_options_get_changed(skb, info->snd_pid,
1217                                                 info->snd_seq, NLM_F_ACK,
1218                                                 team, NULL);
1219 }
1220
1221 static int team_nl_cmd_options_get(struct sk_buff *skb, struct genl_info *info)
1222 {
1223         struct team *team;
1224         int err;
1225
1226         team = team_nl_team_get(info);
1227         if (!team)
1228                 return -EINVAL;
1229
1230         err = team_nl_send_generic(info, team, team_nl_fill_options_get);
1231
1232         team_nl_team_put(team);
1233
1234         return err;
1235 }
1236
1237 static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
1238 {
1239         struct team *team;
1240         int err = 0;
1241         int i;
1242         struct nlattr *nl_option;
1243
1244         team = team_nl_team_get(info);
1245         if (!team)
1246                 return -EINVAL;
1247
1248         err = -EINVAL;
1249         if (!info->attrs[TEAM_ATTR_LIST_OPTION]) {
1250                 err = -EINVAL;
1251                 goto team_put;
1252         }
1253
1254         nla_for_each_nested(nl_option, info->attrs[TEAM_ATTR_LIST_OPTION], i) {
1255                 struct nlattr *mode_attrs[TEAM_ATTR_OPTION_MAX + 1];
1256                 enum team_option_type opt_type;
1257                 struct team_option *option;
1258                 char *opt_name;
1259                 bool opt_found = false;
1260
1261                 if (nla_type(nl_option) != TEAM_ATTR_ITEM_OPTION) {
1262                         err = -EINVAL;
1263                         goto team_put;
1264                 }
1265                 err = nla_parse_nested(mode_attrs, TEAM_ATTR_OPTION_MAX,
1266                                        nl_option, team_nl_option_policy);
1267                 if (err)
1268                         goto team_put;
1269                 if (!mode_attrs[TEAM_ATTR_OPTION_NAME] ||
1270                     !mode_attrs[TEAM_ATTR_OPTION_TYPE] ||
1271                     !mode_attrs[TEAM_ATTR_OPTION_DATA]) {
1272                         err = -EINVAL;
1273                         goto team_put;
1274                 }
1275                 switch (nla_get_u8(mode_attrs[TEAM_ATTR_OPTION_TYPE])) {
1276                 case NLA_U32:
1277                         opt_type = TEAM_OPTION_TYPE_U32;
1278                         break;
1279                 case NLA_STRING:
1280                         opt_type = TEAM_OPTION_TYPE_STRING;
1281                         break;
1282                 default:
1283                         goto team_put;
1284                 }
1285
1286                 opt_name = nla_data(mode_attrs[TEAM_ATTR_OPTION_NAME]);
1287                 list_for_each_entry(option, &team->option_list, list) {
1288                         long arg;
1289                         struct nlattr *opt_data_attr;
1290
1291                         if (option->type != opt_type ||
1292                             strcmp(option->name, opt_name))
1293                                 continue;
1294                         opt_found = true;
1295                         opt_data_attr = mode_attrs[TEAM_ATTR_OPTION_DATA];
1296                         switch (opt_type) {
1297                         case TEAM_OPTION_TYPE_U32:
1298                                 arg = nla_get_u32(opt_data_attr);
1299                                 break;
1300                         case TEAM_OPTION_TYPE_STRING:
1301                                 arg = (long) nla_data(opt_data_attr);
1302                                 break;
1303                         default:
1304                                 BUG();
1305                         }
1306                         err = team_option_set(team, option, &arg);
1307                         if (err)
1308                                 goto team_put;
1309                 }
1310                 if (!opt_found) {
1311                         err = -ENOENT;
1312                         goto team_put;
1313                 }
1314         }
1315
1316 team_put:
1317         team_nl_team_put(team);
1318
1319         return err;
1320 }
1321
1322 static int team_nl_fill_port_list_get_changed(struct sk_buff *skb,
1323                                               u32 pid, u32 seq, int flags,
1324                                               struct team *team,
1325                                               struct team_port *changed_port)
1326 {
1327         struct nlattr *port_list;
1328         void *hdr;
1329         struct team_port *port;
1330
1331         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags,
1332                           TEAM_CMD_PORT_LIST_GET);
1333         if (IS_ERR(hdr))
1334                 return PTR_ERR(hdr);
1335
1336         NLA_PUT_U32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex);
1337         port_list = nla_nest_start(skb, TEAM_ATTR_LIST_PORT);
1338         if (!port_list)
1339                 return -EMSGSIZE;
1340
1341         list_for_each_entry(port, &team->port_list, list) {
1342                 struct nlattr *port_item;
1343
1344                 port_item = nla_nest_start(skb, TEAM_ATTR_ITEM_PORT);
1345                 if (!port_item)
1346                         goto nla_put_failure;
1347                 NLA_PUT_U32(skb, TEAM_ATTR_PORT_IFINDEX, port->dev->ifindex);
1348                 if (port == changed_port)
1349                         NLA_PUT_FLAG(skb, TEAM_ATTR_PORT_CHANGED);
1350                 if (port->linkup)
1351                         NLA_PUT_FLAG(skb, TEAM_ATTR_PORT_LINKUP);
1352                 NLA_PUT_U32(skb, TEAM_ATTR_PORT_SPEED, port->speed);
1353                 NLA_PUT_U8(skb, TEAM_ATTR_PORT_DUPLEX, port->duplex);
1354                 nla_nest_end(skb, port_item);
1355         }
1356
1357         nla_nest_end(skb, port_list);
1358         return genlmsg_end(skb, hdr);
1359
1360 nla_put_failure:
1361         genlmsg_cancel(skb, hdr);
1362         return -EMSGSIZE;
1363 }
1364
1365 static int team_nl_fill_port_list_get(struct sk_buff *skb,
1366                                       struct genl_info *info, int flags,
1367                                       struct team *team)
1368 {
1369         return team_nl_fill_port_list_get_changed(skb, info->snd_pid,
1370                                                   info->snd_seq, NLM_F_ACK,
1371                                                   team, NULL);
1372 }
1373
1374 static int team_nl_cmd_port_list_get(struct sk_buff *skb,
1375                                      struct genl_info *info)
1376 {
1377         struct team *team;
1378         int err;
1379
1380         team = team_nl_team_get(info);
1381         if (!team)
1382                 return -EINVAL;
1383
1384         err = team_nl_send_generic(info, team, team_nl_fill_port_list_get);
1385
1386         team_nl_team_put(team);
1387
1388         return err;
1389 }
1390
1391 static struct genl_ops team_nl_ops[] = {
1392         {
1393                 .cmd = TEAM_CMD_NOOP,
1394                 .doit = team_nl_cmd_noop,
1395                 .policy = team_nl_policy,
1396         },
1397         {
1398                 .cmd = TEAM_CMD_OPTIONS_SET,
1399                 .doit = team_nl_cmd_options_set,
1400                 .policy = team_nl_policy,
1401                 .flags = GENL_ADMIN_PERM,
1402         },
1403         {
1404                 .cmd = TEAM_CMD_OPTIONS_GET,
1405                 .doit = team_nl_cmd_options_get,
1406                 .policy = team_nl_policy,
1407                 .flags = GENL_ADMIN_PERM,
1408         },
1409         {
1410                 .cmd = TEAM_CMD_PORT_LIST_GET,
1411                 .doit = team_nl_cmd_port_list_get,
1412                 .policy = team_nl_policy,
1413                 .flags = GENL_ADMIN_PERM,
1414         },
1415 };
1416
1417 static struct genl_multicast_group team_change_event_mcgrp = {
1418         .name = TEAM_GENL_CHANGE_EVENT_MC_GRP_NAME,
1419 };
1420
1421 static int team_nl_send_event_options_get(struct team *team,
1422                                           struct team_option *changed_option)
1423 {
1424         struct sk_buff *skb;
1425         int err;
1426         struct net *net = dev_net(team->dev);
1427
1428         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1429         if (!skb)
1430                 return -ENOMEM;
1431
1432         err = team_nl_fill_options_get_changed(skb, 0, 0, 0, team,
1433                                                changed_option);
1434         if (err < 0)
1435                 goto err_fill;
1436
1437         err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id,
1438                                       GFP_KERNEL);
1439         return err;
1440
1441 err_fill:
1442         nlmsg_free(skb);
1443         return err;
1444 }
1445
1446 static int team_nl_send_event_port_list_get(struct team_port *port)
1447 {
1448         struct sk_buff *skb;
1449         int err;
1450         struct net *net = dev_net(port->team->dev);
1451
1452         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1453         if (!skb)
1454                 return -ENOMEM;
1455
1456         err = team_nl_fill_port_list_get_changed(skb, 0, 0, 0,
1457                                                  port->team, port);
1458         if (err < 0)
1459                 goto err_fill;
1460
1461         err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id,
1462                                       GFP_KERNEL);
1463         return err;
1464
1465 err_fill:
1466         nlmsg_free(skb);
1467         return err;
1468 }
1469
1470 static int team_nl_init(void)
1471 {
1472         int err;
1473
1474         err = genl_register_family_with_ops(&team_nl_family, team_nl_ops,
1475                                             ARRAY_SIZE(team_nl_ops));
1476         if (err)
1477                 return err;
1478
1479         err = genl_register_mc_group(&team_nl_family, &team_change_event_mcgrp);
1480         if (err)
1481                 goto err_change_event_grp_reg;
1482
1483         return 0;
1484
1485 err_change_event_grp_reg:
1486         genl_unregister_family(&team_nl_family);
1487
1488         return err;
1489 }
1490
1491 static void team_nl_fini(void)
1492 {
1493         genl_unregister_family(&team_nl_family);
1494 }
1495
1496
1497 /******************
1498  * Change checkers
1499  ******************/
1500
1501 static void __team_options_change_check(struct team *team,
1502                                         struct team_option *changed_option)
1503 {
1504         int err;
1505
1506         err = team_nl_send_event_options_get(team, changed_option);
1507         if (err)
1508                 netdev_warn(team->dev, "Failed to send options change via netlink\n");
1509 }
1510
1511 /* rtnl lock is held */
1512 static void __team_port_change_check(struct team_port *port, bool linkup)
1513 {
1514         int err;
1515
1516         if (port->linkup == linkup)
1517                 return;
1518
1519         port->linkup = linkup;
1520         if (linkup) {
1521                 struct ethtool_cmd ecmd;
1522
1523                 err = __ethtool_get_settings(port->dev, &ecmd);
1524                 if (!err) {
1525                         port->speed = ethtool_cmd_speed(&ecmd);
1526                         port->duplex = ecmd.duplex;
1527                         goto send_event;
1528                 }
1529         }
1530         port->speed = 0;
1531         port->duplex = 0;
1532
1533 send_event:
1534         err = team_nl_send_event_port_list_get(port);
1535         if (err)
1536                 netdev_warn(port->team->dev, "Failed to send port change of device %s via netlink\n",
1537                             port->dev->name);
1538
1539 }
1540
1541 static void team_port_change_check(struct team_port *port, bool linkup)
1542 {
1543         struct team *team = port->team;
1544
1545         mutex_lock(&team->lock);
1546         __team_port_change_check(port, linkup);
1547         mutex_unlock(&team->lock);
1548 }
1549
1550 /************************************
1551  * Net device notifier event handler
1552  ************************************/
1553
1554 static int team_device_event(struct notifier_block *unused,
1555                              unsigned long event, void *ptr)
1556 {
1557         struct net_device *dev = (struct net_device *) ptr;
1558         struct team_port *port;
1559
1560         port = team_port_get_rtnl(dev);
1561         if (!port)
1562                 return NOTIFY_DONE;
1563
1564         switch (event) {
1565         case NETDEV_UP:
1566                 if (netif_carrier_ok(dev))
1567                         team_port_change_check(port, true);
1568         case NETDEV_DOWN:
1569                 team_port_change_check(port, false);
1570         case NETDEV_CHANGE:
1571                 if (netif_running(port->dev))
1572                         team_port_change_check(port,
1573                                                !!netif_carrier_ok(port->dev));
1574                 break;
1575         case NETDEV_UNREGISTER:
1576                 team_del_slave(port->team->dev, dev);
1577                 break;
1578         case NETDEV_FEAT_CHANGE:
1579                 team_compute_features(port->team);
1580                 break;
1581         case NETDEV_CHANGEMTU:
1582                 /* Forbid to change mtu of underlaying device */
1583                 return NOTIFY_BAD;
1584         case NETDEV_PRE_TYPE_CHANGE:
1585                 /* Forbid to change type of underlaying device */
1586                 return NOTIFY_BAD;
1587         }
1588         return NOTIFY_DONE;
1589 }
1590
1591 static struct notifier_block team_notifier_block __read_mostly = {
1592         .notifier_call = team_device_event,
1593 };
1594
1595
1596 /***********************
1597  * Module init and exit
1598  ***********************/
1599
1600 static int __init team_module_init(void)
1601 {
1602         int err;
1603
1604         register_netdevice_notifier(&team_notifier_block);
1605
1606         err = rtnl_link_register(&team_link_ops);
1607         if (err)
1608                 goto err_rtnl_reg;
1609
1610         err = team_nl_init();
1611         if (err)
1612                 goto err_nl_init;
1613
1614         return 0;
1615
1616 err_nl_init:
1617         rtnl_link_unregister(&team_link_ops);
1618
1619 err_rtnl_reg:
1620         unregister_netdevice_notifier(&team_notifier_block);
1621
1622         return err;
1623 }
1624
1625 static void __exit team_module_exit(void)
1626 {
1627         team_nl_fini();
1628         rtnl_link_unregister(&team_link_ops);
1629         unregister_netdevice_notifier(&team_notifier_block);
1630 }
1631
1632 module_init(team_module_init);
1633 module_exit(team_module_exit);
1634
1635 MODULE_LICENSE("GPL v2");
1636 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
1637 MODULE_DESCRIPTION("Ethernet team device driver");
1638 MODULE_ALIAS_RTNL_LINK(DRV_NAME);