drivers/net/team/team.c

   1 /*
   2  * drivers/net/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_vlan.h>
  22 #include <linux/if_arp.h>
  23 #include <linux/socket.h>
  24 #include <linux/etherdevice.h>
  25 #include <linux/rtnetlink.h>
  26 #include <net/rtnetlink.h>
  27 #include <net/genetlink.h>
  28 #include <net/netlink.h>
  29 #include <linux/if_team.h>
  30
  31 #define DRV_NAME "team"
  32
  33
  34 /**********
  35  * Helpers
  36  **********/
  37
  38 #define team_port_exists(dev) (dev->priv_flags & IFF_TEAM_PORT)
  39
  40 static struct team_port *team_port_get_rcu(const struct net_device *dev)
  41 {
  42         struct team_port *port = rcu_dereference(dev->rx_handler_data);
  43
  44         return team_port_exists(dev) ? port : NULL;
  45 }
  46
  47 static struct team_port *team_port_get_rtnl(const struct net_device *dev)
  48 {
  49         struct team_port *port = rtnl_dereference(dev->rx_handler_data);
  50
  51         return team_port_exists(dev) ? port : NULL;
  52 }
  53
  54 /*
  55  * Since the ability to change mac address for open port device is tested in
  56  * team_port_add, this function can be called without control of return value
  57  */
  58 static int __set_port_mac(struct net_device *port_dev,
  59                           const unsigned char *dev_addr)
  60 {
  61         struct sockaddr addr;
  62
  63         memcpy(addr.sa_data, dev_addr, ETH_ALEN);
  64         addr.sa_family = ARPHRD_ETHER;
  65         return dev_set_mac_address(port_dev, &addr);
  66 }
  67
  68 static int team_port_set_orig_mac(struct team_port *port)
  69 {
  70         return __set_port_mac(port->dev, port->orig.dev_addr);
  71 }
  72
  73 int team_port_set_team_mac(struct team_port *port)
  74 {
  75         return __set_port_mac(port->dev, port->team->dev->dev_addr);
  76 }
  77 EXPORT_SYMBOL(team_port_set_team_mac);
  78
  79 static void team_refresh_port_linkup(struct team_port *port)
  80 {
  81         port->linkup = port->user.linkup_enabled ? port->user.linkup :
  82                                                    port->state.linkup;
  83 }
  84
  85
  86 /*******************
  87  * Options handling
  88  *******************/
  89
  90 struct team_option_inst { /* One for each option instance */
  91         struct list_head list;
  92         struct list_head tmp_list;
  93         struct team_option *option;
  94         struct team_option_inst_info info;
  95         bool changed;
  96         bool removed;
  97 };
  98
  99 static struct team_option *__team_find_option(struct team *team,
 100                                               const char *opt_name)
 101 {
 102         struct team_option *option;
 103
 104         list_for_each_entry(option, &team->option_list, list) {
 105                 if (strcmp(option->name, opt_name) == 0)
 106                         return option;
 107         }
 108         return NULL;
 109 }
 110
 111 static void __team_option_inst_del(struct team_option_inst *opt_inst)
 112 {
 113         list_del(&opt_inst->list);
 114         kfree(opt_inst);
 115 }
 116
 117 static void __team_option_inst_del_option(struct team *team,
 118                                           struct team_option *option)
 119 {
 120         struct team_option_inst *opt_inst, *tmp;
 121
 122         list_for_each_entry_safe(opt_inst, tmp, &team->option_inst_list, list) {
 123                 if (opt_inst->option == option)
 124                         __team_option_inst_del(opt_inst);
 125         }
 126 }
 127
 128 static int __team_option_inst_add(struct team *team, struct team_option *option,
 129                                   struct team_port *port)
 130 {
 131         struct team_option_inst *opt_inst;
 132         unsigned int array_size;
 133         unsigned int i;
 134         int err;
 135
 136         array_size = option->array_size;
 137         if (!array_size)
 138                 array_size = 1; /* No array but still need one instance */
 139
 140         for (i = 0; i < array_size; i++) {
 141                 opt_inst = kmalloc(sizeof(*opt_inst), GFP_KERNEL);
 142                 if (!opt_inst)
 143                         return -ENOMEM;
 144                 opt_inst->option = option;
 145                 opt_inst->info.port = port;
 146                 opt_inst->info.array_index = i;
 147                 opt_inst->changed = true;
 148                 opt_inst->removed = false;
 149                 list_add_tail(&opt_inst->list, &team->option_inst_list);
 150                 if (option->init) {
 151                         err = option->init(team, &opt_inst->info);
 152                         if (err)
 153                                 return err;
 154                 }
 155
 156         }
 157         return 0;
 158 }
 159
 160 static int __team_option_inst_add_option(struct team *team,
 161                                          struct team_option *option)
 162 {
 163         struct team_port *port;
 164         int err;
 165
 166         if (!option->per_port) {
 167                 err = __team_option_inst_add(team, option, NULL);
 168                 if (err)
 169                         goto inst_del_option;
 170         }
 171
 172         list_for_each_entry(port, &team->port_list, list) {
 173                 err = __team_option_inst_add(team, option, port);
 174                 if (err)
 175                         goto inst_del_option;
 176         }
 177         return 0;
 178
 179 inst_del_option:
 180         __team_option_inst_del_option(team, option);
 181         return err;
 182 }
 183
 184 static void __team_option_inst_mark_removed_option(struct team *team,
 185                                                    struct team_option *option)
 186 {
 187         struct team_option_inst *opt_inst;
 188
 189         list_for_each_entry(opt_inst, &team->option_inst_list, list) {
 190                 if (opt_inst->option == option) {
 191                         opt_inst->changed = true;
 192                         opt_inst->removed = true;
 193                 }
 194         }
 195 }
 196
 197 static void __team_option_inst_del_port(struct team *team,
 198                                         struct team_port *port)
 199 {
 200         struct team_option_inst *opt_inst, *tmp;
 201
 202         list_for_each_entry_safe(opt_inst, tmp, &team->option_inst_list, list) {
 203                 if (opt_inst->option->per_port &&
 204                     opt_inst->info.port == port)
 205                         __team_option_inst_del(opt_inst);
 206         }
 207 }
 208
 209 static int __team_option_inst_add_port(struct team *team,
 210                                        struct team_port *port)
 211 {
 212         struct team_option *option;
 213         int err;
 214
 215         list_for_each_entry(option, &team->option_list, list) {
 216                 if (!option->per_port)
 217                         continue;
 218                 err = __team_option_inst_add(team, option, port);
 219                 if (err)
 220                         goto inst_del_port;
 221         }
 222         return 0;
 223
 224 inst_del_port:
 225         __team_option_inst_del_port(team, port);
 226         return err;
 227 }
 228
 229 static void __team_option_inst_mark_removed_port(struct team *team,
 230                                                  struct team_port *port)
 231 {
 232         struct team_option_inst *opt_inst;
 233
 234         list_for_each_entry(opt_inst, &team->option_inst_list, list) {
 235                 if (opt_inst->info.port == port) {
 236                         opt_inst->changed = true;
 237                         opt_inst->removed = true;
 238                 }
 239         }
 240 }
 241
 242 static int __team_options_register(struct team *team,
 243                                    const struct team_option *option,
 244                                    size_t option_count)
 245 {
 246         int i;
 247         struct team_option **dst_opts;
 248         int err;
 249
 250         dst_opts = kzalloc(sizeof(struct team_option *) * option_count,
 251                            GFP_KERNEL);
 252         if (!dst_opts)
 253                 return -ENOMEM;
 254         for (i = 0; i < option_count; i++, option++) {
 255                 if (__team_find_option(team, option->name)) {
 256                         err = -EEXIST;
 257                         goto alloc_rollback;
 258                 }
 259                 dst_opts[i] = kmemdup(option, sizeof(*option), GFP_KERNEL);
 260                 if (!dst_opts[i]) {
 261                         err = -ENOMEM;
 262                         goto alloc_rollback;
 263                 }
 264         }
 265
 266         for (i = 0; i < option_count; i++) {
 267                 err = __team_option_inst_add_option(team, dst_opts[i]);
 268                 if (err)
 269                         goto inst_rollback;
 270                 list_add_tail(&dst_opts[i]->list, &team->option_list);
 271         }
 272
 273         kfree(dst_opts);
 274         return 0;
 275
 276 inst_rollback:
 277         for (i--; i >= 0; i--)
 278                 __team_option_inst_del_option(team, dst_opts[i]);
 279
 280         i = option_count - 1;
 281 alloc_rollback:
 282         for (i--; i >= 0; i--)
 283                 kfree(dst_opts[i]);
 284
 285         kfree(dst_opts);
 286         return err;
 287 }
 288
 289 static void __team_options_mark_removed(struct team *team,
 290                                         const struct team_option *option,
 291                                         size_t option_count)
 292 {
 293         int i;
 294
 295         for (i = 0; i < option_count; i++, option++) {
 296                 struct team_option *del_opt;
 297
 298                 del_opt = __team_find_option(team, option->name);
 299                 if (del_opt)
 300                         __team_option_inst_mark_removed_option(team, del_opt);
 301         }
 302 }
 303
 304 static void __team_options_unregister(struct team *team,
 305                                       const struct team_option *option,
 306                                       size_t option_count)
 307 {
 308         int i;
 309
 310         for (i = 0; i < option_count; i++, option++) {
 311                 struct team_option *del_opt;
 312
 313                 del_opt = __team_find_option(team, option->name);
 314                 if (del_opt) {
 315                         __team_option_inst_del_option(team, del_opt);
 316                         list_del(&del_opt->list);
 317                         kfree(del_opt);
 318                 }
 319         }
 320 }
 321
 322 static void __team_options_change_check(struct team *team);
 323
 324 int team_options_register(struct team *team,
 325                           const struct team_option *option,
 326                           size_t option_count)
 327 {
 328         int err;
 329
 330         err = __team_options_register(team, option, option_count);
 331         if (err)
 332                 return err;
 333         __team_options_change_check(team);
 334         return 0;
 335 }
 336 EXPORT_SYMBOL(team_options_register);
 337
 338 void team_options_unregister(struct team *team,
 339                              const struct team_option *option,
 340                              size_t option_count)
 341 {
 342         __team_options_mark_removed(team, option, option_count);
 343         __team_options_change_check(team);
 344         __team_options_unregister(team, option, option_count);
 345 }
 346 EXPORT_SYMBOL(team_options_unregister);
 347
 348 static int team_option_get(struct team *team,
 349                            struct team_option_inst *opt_inst,
 350                            struct team_gsetter_ctx *ctx)
 351 {
 352         if (!opt_inst->option->getter)
 353                 return -EOPNOTSUPP;
 354         return opt_inst->option->getter(team, ctx);
 355 }
 356
 357 static int team_option_set(struct team *team,
 358                            struct team_option_inst *opt_inst,
 359                            struct team_gsetter_ctx *ctx)
 360 {
 361         if (!opt_inst->option->setter)
 362                 return -EOPNOTSUPP;
 363         return opt_inst->option->setter(team, ctx);
 364 }
 365
 366 void team_option_inst_set_change(struct team_option_inst_info *opt_inst_info)
 367 {
 368         struct team_option_inst *opt_inst;
 369
 370         opt_inst = container_of(opt_inst_info, struct team_option_inst, info);
 371         opt_inst->changed = true;
 372 }
 373 EXPORT_SYMBOL(team_option_inst_set_change);
 374
 375 void team_options_change_check(struct team *team)
 376 {
 377         __team_options_change_check(team);
 378 }
 379 EXPORT_SYMBOL(team_options_change_check);
 380
 381
 382 /****************
 383  * Mode handling
 384  ****************/
 385
 386 static LIST_HEAD(mode_list);
 387 static DEFINE_SPINLOCK(mode_list_lock);
 388
 389 struct team_mode_item {
 390         struct list_head list;
 391         const struct team_mode *mode;
 392 };
 393
 394 static struct team_mode_item *__find_mode(const char *kind)
 395 {
 396         struct team_mode_item *mitem;
 397
 398         list_for_each_entry(mitem, &mode_list, list) {
 399                 if (strcmp(mitem->mode->kind, kind) == 0)
 400                         return mitem;
 401         }
 402         return NULL;
 403 }
 404
 405 static bool is_good_mode_name(const char *name)
 406 {
 407         while (*name != '\0') {
 408                 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
 409                         return false;
 410                 name++;
 411         }
 412         return true;
 413 }
 414
 415 int team_mode_register(const struct team_mode *mode)
 416 {
 417         int err = 0;
 418         struct team_mode_item *mitem;
 419
 420         if (!is_good_mode_name(mode->kind) ||
 421             mode->priv_size > TEAM_MODE_PRIV_SIZE)
 422                 return -EINVAL;
 423
 424         mitem = kmalloc(sizeof(*mitem), GFP_KERNEL);
 425         if (!mitem)
 426                 return -ENOMEM;
 427
 428         spin_lock(&mode_list_lock);
 429         if (__find_mode(mode->kind)) {
 430                 err = -EEXIST;
 431                 kfree(mitem);
 432                 goto unlock;
 433         }
 434         mitem->mode = mode;
 435         list_add_tail(&mitem->list, &mode_list);
 436 unlock:
 437         spin_unlock(&mode_list_lock);
 438         return err;
 439 }
 440 EXPORT_SYMBOL(team_mode_register);
 441
 442 void team_mode_unregister(const struct team_mode *mode)
 443 {
 444         struct team_mode_item *mitem;
 445
 446         spin_lock(&mode_list_lock);
 447         mitem = __find_mode(mode->kind);
 448         if (mitem) {
 449                 list_del_init(&mitem->list);
 450                 kfree(mitem);
 451         }
 452         spin_unlock(&mode_list_lock);
 453 }
 454 EXPORT_SYMBOL(team_mode_unregister);
 455
 456 static const struct team_mode *team_mode_get(const char *kind)
 457 {
 458         struct team_mode_item *mitem;
 459         const struct team_mode *mode = NULL;
 460
 461         spin_lock(&mode_list_lock);
 462         mitem = __find_mode(kind);
 463         if (!mitem) {
 464                 spin_unlock(&mode_list_lock);
 465                 request_module("team-mode-%s", kind);
 466                 spin_lock(&mode_list_lock);
 467                 mitem = __find_mode(kind);
 468         }
 469         if (mitem) {
 470                 mode = mitem->mode;
 471                 if (!try_module_get(mode->owner))
 472                         mode = NULL;
 473         }
 474
 475         spin_unlock(&mode_list_lock);
 476         return mode;
 477 }
 478
 479 static void team_mode_put(const struct team_mode *mode)
 480 {
 481         module_put(mode->owner);
 482 }
 483
 484 static bool team_dummy_transmit(struct team *team, struct sk_buff *skb)
 485 {
 486         dev_kfree_skb_any(skb);
 487         return false;
 488 }
 489
 490 rx_handler_result_t team_dummy_receive(struct team *team,
 491                                        struct team_port *port,
 492                                        struct sk_buff *skb)
 493 {
 494         return RX_HANDLER_ANOTHER;
 495 }
 496
 497 static const struct team_mode __team_no_mode = {
 498         .kind           = "*NOMODE*",
 499 };
 500
 501 static bool team_is_mode_set(struct team *team)
 502 {
 503         return team->mode != &__team_no_mode;
 504 }
 505
 506 static void team_set_no_mode(struct team *team)
 507 {
 508         team->mode = &__team_no_mode;
 509 }
 510
 511 static void team_adjust_ops(struct team *team)
 512 {
 513         /*
 514          * To avoid checks in rx/tx skb paths, ensure here that non-null and
 515          * correct ops are always set.
 516          */
 517
 518         if (list_empty(&team->port_list) ||
 519             !team_is_mode_set(team) || !team->mode->ops->transmit)
 520                 team->ops.transmit = team_dummy_transmit;
 521         else
 522                 team->ops.transmit = team->mode->ops->transmit;
 523
 524         if (list_empty(&team->port_list) ||
 525             !team_is_mode_set(team) || !team->mode->ops->receive)
 526                 team->ops.receive = team_dummy_receive;
 527         else
 528                 team->ops.receive = team->mode->ops->receive;
 529 }
 530
 531 /*
 532  * We can benefit from the fact that it's ensured no port is present
 533  * at the time of mode change. Therefore no packets are in fly so there's no
 534  * need to set mode operations in any special way.
 535  */
 536 static int __team_change_mode(struct team *team,
 537                               const struct team_mode *new_mode)
 538 {
 539         /* Check if mode was previously set and do cleanup if so */
 540         if (team_is_mode_set(team)) {
 541                 void (*exit_op)(struct team *team) = team->ops.exit;
 542
 543                 /* Clear ops area so no callback is called any longer */
 544                 memset(&team->ops, 0, sizeof(struct team_mode_ops));
 545                 team_adjust_ops(team);
 546
 547                 if (exit_op)
 548                         exit_op(team);
 549                 team_mode_put(team->mode);
 550                 team_set_no_mode(team);
 551                 /* zero private data area */
 552                 memset(&team->mode_priv, 0,
 553                        sizeof(struct team) - offsetof(struct team, mode_priv));
 554         }
 555
 556         if (!new_mode)
 557                 return 0;
 558
 559         if (new_mode->ops->init) {
 560                 int err;
 561
 562                 err = new_mode->ops->init(team);
 563                 if (err)
 564                         return err;
 565         }
 566
 567         team->mode = new_mode;
 568         memcpy(&team->ops, new_mode->ops, sizeof(struct team_mode_ops));
 569         team_adjust_ops(team);
 570
 571         return 0;
 572 }
 573
 574 static int team_change_mode(struct team *team, const char *kind)
 575 {
 576         const struct team_mode *new_mode;
 577         struct net_device *dev = team->dev;
 578         int err;
 579
 580         if (!list_empty(&team->port_list)) {
 581                 netdev_err(dev, "No ports can be present during mode change\n");
 582                 return -EBUSY;
 583         }
 584
 585         if (team_is_mode_set(team) && strcmp(team->mode->kind, kind) == 0) {
 586                 netdev_err(dev, "Unable to change to the same mode the team is in\n");
 587                 return -EINVAL;
 588         }
 589
 590         new_mode = team_mode_get(kind);
 591         if (!new_mode) {
 592                 netdev_err(dev, "Mode \"%s\" not found\n", kind);
 593                 return -EINVAL;
 594         }
 595
 596         err = __team_change_mode(team, new_mode);
 597         if (err) {
 598                 netdev_err(dev, "Failed to change to mode \"%s\"\n", kind);
 599                 team_mode_put(new_mode);
 600                 return err;
 601         }
 602
 603         netdev_info(dev, "Mode changed to \"%s\"\n", kind);
 604         return 0;
 605 }
 606
 607
 608 /************************
 609  * Rx path frame handler
 610  ************************/
 611
 612 static bool team_port_enabled(struct team_port *port);
 613
 614 /* note: already called with rcu_read_lock */
 615 static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
 616 {
 617         struct sk_buff *skb = *pskb;
 618         struct team_port *port;
 619         struct team *team;
 620         rx_handler_result_t res;
 621
 622         skb = skb_share_check(skb, GFP_ATOMIC);
 623         if (!skb)
 624                 return RX_HANDLER_CONSUMED;
 625
 626         *pskb = skb;
 627
 628         port = team_port_get_rcu(skb->dev);
 629         team = port->team;
 630         if (!team_port_enabled(port)) {
 631                 /* allow exact match delivery for disabled ports */
 632                 res = RX_HANDLER_EXACT;
 633         } else {
 634                 res = team->ops.receive(team, port, skb);
 635         }
 636         if (res == RX_HANDLER_ANOTHER) {
 637                 struct team_pcpu_stats *pcpu_stats;
 638
 639                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
 640                 u64_stats_update_begin(&pcpu_stats->syncp);
 641                 pcpu_stats->rx_packets++;
 642                 pcpu_stats->rx_bytes += skb->len;
 643                 if (skb->pkt_type == PACKET_MULTICAST)
 644                         pcpu_stats->rx_multicast++;
 645                 u64_stats_update_end(&pcpu_stats->syncp);
 646
 647                 skb->dev = team->dev;
 648         } else {
 649                 this_cpu_inc(team->pcpu_stats->rx_dropped);
 650         }
 651
 652         return res;
 653 }
 654
 655
 656 /****************
 657  * Port handling
 658  ****************/
 659
 660 static bool team_port_find(const struct team *team,
 661                            const struct team_port *port)
 662 {
 663         struct team_port *cur;
 664
 665         list_for_each_entry(cur, &team->port_list, list)
 666                 if (cur == port)
 667                         return true;
 668         return false;
 669 }
 670
 671 static bool team_port_enabled(struct team_port *port)
 672 {
 673         return port->index != -1;
 674 }
 675
 676 /*
 677  * Enable/disable port by adding to enabled port hashlist and setting
 678  * port->index (Might be racy so reader could see incorrect ifindex when
 679  * processing a flying packet, but that is not a problem). Write guarded
 680  * by team->lock.
 681  */
 682 static void team_port_enable(struct team *team,
 683                              struct team_port *port)
 684 {
 685         if (team_port_enabled(port))
 686                 return;
 687         port->index = team->en_port_count++;
 688         hlist_add_head_rcu(&port->hlist,
 689                            team_port_index_hash(team, port->index));
 690         if (team->ops.port_enabled)
 691                 team->ops.port_enabled(team, port);
 692 }
 693
 694 static void __reconstruct_port_hlist(struct team *team, int rm_index)
 695 {
 696         int i;
 697         struct team_port *port;
 698
 699         for (i = rm_index + 1; i < team->en_port_count; i++) {
 700                 port = team_get_port_by_index(team, i);
 701                 hlist_del_rcu(&port->hlist);
 702                 port->index--;
 703                 hlist_add_head_rcu(&port->hlist,
 704                                    team_port_index_hash(team, port->index));
 705         }
 706 }
 707
 708 static void team_port_disable(struct team *team,
 709                               struct team_port *port)
 710 {
 711         int rm_index = port->index;
 712
 713         if (!team_port_enabled(port))
 714                 return;
 715         if (team->ops.port_disabled)
 716                 team->ops.port_disabled(team, port);
 717         hlist_del_rcu(&port->hlist);
 718         __reconstruct_port_hlist(team, rm_index);
 719         team->en_port_count--;
 720         port->index = -1;
 721 }
 722
 723 #define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
 724                             NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
 725                             NETIF_F_HIGHDMA | NETIF_F_LRO)
 726
 727 static void __team_compute_features(struct team *team)
 728 {
 729         struct team_port *port;
 730         u32 vlan_features = TEAM_VLAN_FEATURES;
 731         unsigned short max_hard_header_len = ETH_HLEN;
 732
 733         list_for_each_entry(port, &team->port_list, list) {
 734                 vlan_features = netdev_increment_features(vlan_features,
 735                                         port->dev->vlan_features,
 736                                         TEAM_VLAN_FEATURES);
 737
 738                 if (port->dev->hard_header_len > max_hard_header_len)
 739                         max_hard_header_len = port->dev->hard_header_len;
 740         }
 741
 742         team->dev->vlan_features = vlan_features;
 743         team->dev->hard_header_len = max_hard_header_len;
 744
 745         netdev_change_features(team->dev);
 746 }
 747
 748 static void team_compute_features(struct team *team)
 749 {
 750         mutex_lock(&team->lock);
 751         __team_compute_features(team);
 752         mutex_unlock(&team->lock);
 753 }
 754
 755 static int team_port_enter(struct team *team, struct team_port *port)
 756 {
 757         int err = 0;
 758
 759         dev_hold(team->dev);
 760         port->dev->priv_flags |= IFF_TEAM_PORT;
 761         if (team->ops.port_enter) {
 762                 err = team->ops.port_enter(team, port);
 763                 if (err) {
 764                         netdev_err(team->dev, "Device %s failed to enter team mode\n",
 765                                    port->dev->name);
 766                         goto err_port_enter;
 767                 }
 768         }
 769
 770         return 0;
 771
 772 err_port_enter:
 773         port->dev->priv_flags &= ~IFF_TEAM_PORT;
 774         dev_put(team->dev);
 775
 776         return err;
 777 }
 778
 779 static void team_port_leave(struct team *team, struct team_port *port)
 780 {
 781         if (team->ops.port_leave)
 782                 team->ops.port_leave(team, port);
 783         port->dev->priv_flags &= ~IFF_TEAM_PORT;
 784         dev_put(team->dev);
 785 }
 786
 787 static void __team_port_change_check(struct team_port *port, bool linkup);
 788
 789 static int team_port_add(struct team *team, struct net_device *port_dev)
 790 {
 791         struct net_device *dev = team->dev;
 792         struct team_port *port;
 793         char *portname = port_dev->name;
 794         int err;
 795
 796         if (port_dev->flags & IFF_LOOPBACK ||
 797             port_dev->type != ARPHRD_ETHER) {
 798                 netdev_err(dev, "Device %s is of an unsupported type\n",
 799                            portname);
 800                 return -EINVAL;
 801         }
 802
 803         if (team_port_exists(port_dev)) {
 804                 netdev_err(dev, "Device %s is already a port "
 805                                 "of a team device\n", portname);
 806                 return -EBUSY;
 807         }
 808
 809         if (port_dev->flags & IFF_UP) {
 810                 netdev_err(dev, "Device %s is up. Set it down before adding it as a team port\n",
 811                            portname);
 812                 return -EBUSY;
 813         }
 814
 815         port = kzalloc(sizeof(struct team_port) + team->mode->port_priv_size,
 816                        GFP_KERNEL);
 817         if (!port)
 818                 return -ENOMEM;
 819
 820         port->dev = port_dev;
 821         port->team = team;
 822
 823         port->orig.mtu = port_dev->mtu;
 824         err = dev_set_mtu(port_dev, dev->mtu);
 825         if (err) {
 826                 netdev_dbg(dev, "Error %d calling dev_set_mtu\n", err);
 827                 goto err_set_mtu;
 828         }
 829
 830         memcpy(port->orig.dev_addr, port_dev->dev_addr, ETH_ALEN);
 831
 832         err = team_port_enter(team, port);
 833         if (err) {
 834                 netdev_err(dev, "Device %s failed to enter team mode\n",
 835                            portname);
 836                 goto err_port_enter;
 837         }
 838
 839         err = dev_open(port_dev);
 840         if (err) {
 841                 netdev_dbg(dev, "Device %s opening failed\n",
 842                            portname);
 843                 goto err_dev_open;
 844         }
 845
 846         err = vlan_vids_add_by_dev(port_dev, dev);
 847         if (err) {
 848                 netdev_err(dev, "Failed to add vlan ids to device %s\n",
 849                                 portname);
 850                 goto err_vids_add;
 851         }
 852
 853         err = netdev_set_master(port_dev, dev);
 854         if (err) {
 855                 netdev_err(dev, "Device %s failed to set master\n", portname);
 856                 goto err_set_master;
 857         }
 858
 859         err = netdev_rx_handler_register(port_dev, team_handle_frame,
 860                                          port);
 861         if (err) {
 862                 netdev_err(dev, "Device %s failed to register rx_handler\n",
 863                            portname);
 864                 goto err_handler_register;
 865         }
 866
 867         err = __team_option_inst_add_port(team, port);
 868         if (err) {
 869                 netdev_err(dev, "Device %s failed to add per-port options\n",
 870                            portname);
 871                 goto err_option_port_add;
 872         }
 873
 874         port->index = -1;
 875         team_port_enable(team, port);
 876         list_add_tail_rcu(&port->list, &team->port_list);
 877         team_adjust_ops(team);
 878         __team_compute_features(team);
 879         __team_port_change_check(port, !!netif_carrier_ok(port_dev));
 880         __team_options_change_check(team);
 881
 882         netdev_info(dev, "Port device %s added\n", portname);
 883
 884         return 0;
 885
 886 err_option_port_add:
 887         netdev_rx_handler_unregister(port_dev);
 888
 889 err_handler_register:
 890         netdev_set_master(port_dev, NULL);
 891
 892 err_set_master:
 893         vlan_vids_del_by_dev(port_dev, dev);
 894
 895 err_vids_add:
 896         dev_close(port_dev);
 897
 898 err_dev_open:
 899         team_port_leave(team, port);
 900         team_port_set_orig_mac(port);
 901
 902 err_port_enter:
 903         dev_set_mtu(port_dev, port->orig.mtu);
 904
 905 err_set_mtu:
 906         kfree(port);
 907
 908         return err;
 909 }
 910
 911 static int team_port_del(struct team *team, struct net_device *port_dev)
 912 {
 913         struct net_device *dev = team->dev;
 914         struct team_port *port;
 915         char *portname = port_dev->name;
 916
 917         port = team_port_get_rtnl(port_dev);
 918         if (!port || !team_port_find(team, port)) {
 919                 netdev_err(dev, "Device %s does not act as a port of this team\n",
 920                            portname);
 921                 return -ENOENT;
 922         }
 923
 924         __team_option_inst_mark_removed_port(team, port);
 925         __team_options_change_check(team);
 926         __team_option_inst_del_port(team, port);
 927         port->removed = true;
 928         __team_port_change_check(port, false);
 929         team_port_disable(team, port);
 930         list_del_rcu(&port->list);
 931         team_adjust_ops(team);
 932         netdev_rx_handler_unregister(port_dev);
 933         netdev_set_master(port_dev, NULL);
 934         vlan_vids_del_by_dev(port_dev, dev);
 935         dev_close(port_dev);
 936         team_port_leave(team, port);
 937         team_port_set_orig_mac(port);
 938         dev_set_mtu(port_dev, port->orig.mtu);
 939         synchronize_rcu();
 940         kfree(port);
 941         netdev_info(dev, "Port device %s removed\n", portname);
 942         __team_compute_features(team);
 943
 944         return 0;
 945 }
 946
 947
 948 /*****************
 949  * Net device ops
 950  *****************/
 951
 952 static int team_mode_option_get(struct team *team, struct team_gsetter_ctx *ctx)
 953 {
 954         ctx->data.str_val = team->mode->kind;
 955         return 0;
 956 }
 957
 958 static int team_mode_option_set(struct team *team, struct team_gsetter_ctx *ctx)
 959 {
 960         return team_change_mode(team, ctx->data.str_val);
 961 }
 962
 963 static int team_port_en_option_get(struct team *team,
 964                                    struct team_gsetter_ctx *ctx)
 965 {
 966         struct team_port *port = ctx->info->port;
 967
 968         ctx->data.bool_val = team_port_enabled(port);
 969         return 0;
 970 }
 971
 972 static int team_port_en_option_set(struct team *team,
 973                                    struct team_gsetter_ctx *ctx)
 974 {
 975         struct team_port *port = ctx->info->port;
 976
 977         if (ctx->data.bool_val)
 978                 team_port_enable(team, port);
 979         else
 980                 team_port_disable(team, port);
 981         return 0;
 982 }
 983
 984 static int team_user_linkup_option_get(struct team *team,
 985                                        struct team_gsetter_ctx *ctx)
 986 {
 987         struct team_port *port = ctx->info->port;
 988
 989         ctx->data.bool_val = port->user.linkup;
 990         return 0;
 991 }
 992
 993 static int team_user_linkup_option_set(struct team *team,
 994                                        struct team_gsetter_ctx *ctx)
 995 {
 996         struct team_port *port = ctx->info->port;
 997
 998         port->user.linkup = ctx->data.bool_val;
 999         team_refresh_port_linkup(port);
1000         return 0;
1001 }
1002
1003 static int team_user_linkup_en_option_get(struct team *team,
1004                                           struct team_gsetter_ctx *ctx)
1005 {
1006         struct team_port *port = ctx->info->port;
1007
1008         ctx->data.bool_val = port->user.linkup_enabled;
1009         return 0;
1010 }
1011
1012 static int team_user_linkup_en_option_set(struct team *team,
1013                                           struct team_gsetter_ctx *ctx)
1014 {
1015         struct team_port *port = ctx->info->port;
1016
1017         port->user.linkup_enabled = ctx->data.bool_val;
1018         team_refresh_port_linkup(port);
1019         return 0;
1020 }
1021
1022 static const struct team_option team_options[] = {
1023         {
1024                 .name = "mode",
1025                 .type = TEAM_OPTION_TYPE_STRING,
1026                 .getter = team_mode_option_get,
1027                 .setter = team_mode_option_set,
1028         },
1029         {
1030                 .name = "enabled",
1031                 .type = TEAM_OPTION_TYPE_BOOL,
1032                 .per_port = true,
1033                 .getter = team_port_en_option_get,
1034                 .setter = team_port_en_option_set,
1035         },
1036         {
1037                 .name = "user_linkup",
1038                 .type = TEAM_OPTION_TYPE_BOOL,
1039                 .per_port = true,
1040                 .getter = team_user_linkup_option_get,
1041                 .setter = team_user_linkup_option_set,
1042         },
1043         {
1044                 .name = "user_linkup_enabled",
1045                 .type = TEAM_OPTION_TYPE_BOOL,
1046                 .per_port = true,
1047                 .getter = team_user_linkup_en_option_get,
1048                 .setter = team_user_linkup_en_option_set,
1049         },
1050 };
1051
1052 static int team_init(struct net_device *dev)
1053 {
1054         struct team *team = netdev_priv(dev);
1055         int i;
1056         int err;
1057
1058         team->dev = dev;
1059         mutex_init(&team->lock);
1060         team_set_no_mode(team);
1061
1062         team->pcpu_stats = alloc_percpu(struct team_pcpu_stats);
1063         if (!team->pcpu_stats)
1064                 return -ENOMEM;
1065
1066         for (i = 0; i < TEAM_PORT_HASHENTRIES; i++)
1067                 INIT_HLIST_HEAD(&team->en_port_hlist[i]);
1068         INIT_LIST_HEAD(&team->port_list);
1069
1070         team_adjust_ops(team);
1071
1072         INIT_LIST_HEAD(&team->option_list);
1073         INIT_LIST_HEAD(&team->option_inst_list);
1074         err = team_options_register(team, team_options, ARRAY_SIZE(team_options));
1075         if (err)
1076                 goto err_options_register;
1077         netif_carrier_off(dev);
1078
1079         return 0;
1080
1081 err_options_register:
1082         free_percpu(team->pcpu_stats);
1083
1084         return err;
1085 }
1086
1087 static void team_uninit(struct net_device *dev)
1088 {
1089         struct team *team = netdev_priv(dev);
1090         struct team_port *port;
1091         struct team_port *tmp;
1092
1093         mutex_lock(&team->lock);
1094         list_for_each_entry_safe(port, tmp, &team->port_list, list)
1095                 team_port_del(team, port->dev);
1096
1097         __team_change_mode(team, NULL); /* cleanup */
1098         __team_options_unregister(team, team_options, ARRAY_SIZE(team_options));
1099         mutex_unlock(&team->lock);
1100 }
1101
1102 static void team_destructor(struct net_device *dev)
1103 {
1104         struct team *team = netdev_priv(dev);
1105
1106         free_percpu(team->pcpu_stats);
1107         free_netdev(dev);
1108 }
1109
1110 static int team_open(struct net_device *dev)
1111 {
1112         netif_carrier_on(dev);
1113         return 0;
1114 }
1115
1116 static int team_close(struct net_device *dev)
1117 {
1118         netif_carrier_off(dev);
1119         return 0;
1120 }
1121
1122 /*
1123  * note: already called with rcu_read_lock
1124  */
1125 static netdev_tx_t team_xmit(struct sk_buff *skb, struct net_device *dev)
1126 {
1127         struct team *team = netdev_priv(dev);
1128         bool tx_success = false;
1129         unsigned int len = skb->len;
1130
1131         tx_success = team->ops.transmit(team, skb);
1132         if (tx_success) {
1133                 struct team_pcpu_stats *pcpu_stats;
1134
1135                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
1136                 u64_stats_update_begin(&pcpu_stats->syncp);
1137                 pcpu_stats->tx_packets++;
1138                 pcpu_stats->tx_bytes += len;
1139                 u64_stats_update_end(&pcpu_stats->syncp);
1140         } else {
1141                 this_cpu_inc(team->pcpu_stats->tx_dropped);
1142         }
1143
1144         return NETDEV_TX_OK;
1145 }
1146
1147 static void team_change_rx_flags(struct net_device *dev, int change)
1148 {
1149         struct team *team = netdev_priv(dev);
1150         struct team_port *port;
1151         int inc;
1152
1153         rcu_read_lock();
1154         list_for_each_entry_rcu(port, &team->port_list, list) {
1155                 if (change & IFF_PROMISC) {
1156                         inc = dev->flags & IFF_PROMISC ? 1 : -1;
1157                         dev_set_promiscuity(port->dev, inc);
1158                 }
1159                 if (change & IFF_ALLMULTI) {
1160                         inc = dev->flags & IFF_ALLMULTI ? 1 : -1;
1161                         dev_set_allmulti(port->dev, inc);
1162                 }
1163         }
1164         rcu_read_unlock();
1165 }
1166
1167 static void team_set_rx_mode(struct net_device *dev)
1168 {
1169         struct team *team = netdev_priv(dev);
1170         struct team_port *port;
1171
1172         rcu_read_lock();
1173         list_for_each_entry_rcu(port, &team->port_list, list) {
1174                 dev_uc_sync(port->dev, dev);
1175                 dev_mc_sync(port->dev, dev);
1176         }
1177         rcu_read_unlock();
1178 }
1179
1180 static int team_set_mac_address(struct net_device *dev, void *p)
1181 {
1182         struct team *team = netdev_priv(dev);
1183         struct team_port *port;
1184         struct sockaddr *addr = p;
1185
1186         dev->addr_assign_type &= ~NET_ADDR_RANDOM;
1187         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
1188         rcu_read_lock();
1189         list_for_each_entry_rcu(port, &team->port_list, list)
1190                 if (team->ops.port_change_mac)
1191                         team->ops.port_change_mac(team, port);
1192         rcu_read_unlock();
1193         return 0;
1194 }
1195
1196 static int team_change_mtu(struct net_device *dev, int new_mtu)
1197 {
1198         struct team *team = netdev_priv(dev);
1199         struct team_port *port;
1200         int err;
1201
1202         /*
1203          * Alhough this is reader, it's guarded by team lock. It's not possible
1204          * to traverse list in reverse under rcu_read_lock
1205          */
1206         mutex_lock(&team->lock);
1207         list_for_each_entry(port, &team->port_list, list) {
1208                 err = dev_set_mtu(port->dev, new_mtu);
1209                 if (err) {
1210                         netdev_err(dev, "Device %s failed to change mtu",
1211                                    port->dev->name);
1212                         goto unwind;
1213                 }
1214         }
1215         mutex_unlock(&team->lock);
1216
1217         dev->mtu = new_mtu;
1218
1219         return 0;
1220
1221 unwind:
1222         list_for_each_entry_continue_reverse(port, &team->port_list, list)
1223                 dev_set_mtu(port->dev, dev->mtu);
1224         mutex_unlock(&team->lock);
1225
1226         return err;
1227 }
1228
1229 static struct rtnl_link_stats64 *
1230 team_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1231 {
1232         struct team *team = netdev_priv(dev);
1233         struct team_pcpu_stats *p;
1234         u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
1235         u32 rx_dropped = 0, tx_dropped = 0;
1236         unsigned int start;
1237         int i;
1238
1239         for_each_possible_cpu(i) {
1240                 p = per_cpu_ptr(team->pcpu_stats, i);
1241                 do {
1242                         start = u64_stats_fetch_begin_bh(&p->syncp);
1243                         rx_packets      = p->rx_packets;
1244                         rx_bytes        = p->rx_bytes;
1245                         rx_multicast    = p->rx_multicast;
1246                         tx_packets      = p->tx_packets;
1247                         tx_bytes        = p->tx_bytes;
1248                 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
1249
1250                 stats->rx_packets       += rx_packets;
1251                 stats->rx_bytes         += rx_bytes;
1252                 stats->multicast        += rx_multicast;
1253                 stats->tx_packets       += tx_packets;
1254                 stats->tx_bytes         += tx_bytes;
1255                 /*
1256                  * rx_dropped & tx_dropped are u32, updated
1257                  * without syncp protection.
1258                  */
1259                 rx_dropped      += p->rx_dropped;
1260                 tx_dropped      += p->tx_dropped;
1261         }
1262         stats->rx_dropped       = rx_dropped;
1263         stats->tx_dropped       = tx_dropped;
1264         return stats;
1265 }
1266
1267 static int team_vlan_rx_add_vid(struct net_device *dev, uint16_t vid)
1268 {
1269         struct team *team = netdev_priv(dev);
1270         struct team_port *port;
1271         int err;
1272
1273         /*
1274          * Alhough this is reader, it's guarded by team lock. It's not possible
1275          * to traverse list in reverse under rcu_read_lock
1276          */
1277         mutex_lock(&team->lock);
1278         list_for_each_entry(port, &team->port_list, list) {
1279                 err = vlan_vid_add(port->dev, vid);
1280                 if (err)
1281                         goto unwind;
1282         }
1283         mutex_unlock(&team->lock);
1284
1285         return 0;
1286
1287 unwind:
1288         list_for_each_entry_continue_reverse(port, &team->port_list, list)
1289                 vlan_vid_del(port->dev, vid);
1290         mutex_unlock(&team->lock);
1291
1292         return err;
1293 }
1294
1295 static int team_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid)
1296 {
1297         struct team *team = netdev_priv(dev);
1298         struct team_port *port;
1299
1300         rcu_read_lock();
1301         list_for_each_entry_rcu(port, &team->port_list, list)
1302                 vlan_vid_del(port->dev, vid);
1303         rcu_read_unlock();
1304
1305         return 0;
1306 }
1307
1308 static int team_add_slave(struct net_device *dev, struct net_device *port_dev)
1309 {
1310         struct team *team = netdev_priv(dev);
1311         int err;
1312
1313         mutex_lock(&team->lock);
1314         err = team_port_add(team, port_dev);
1315         mutex_unlock(&team->lock);
1316         return err;
1317 }
1318
1319 static int team_del_slave(struct net_device *dev, struct net_device *port_dev)
1320 {
1321         struct team *team = netdev_priv(dev);
1322         int err;
1323
1324         mutex_lock(&team->lock);
1325         err = team_port_del(team, port_dev);
1326         mutex_unlock(&team->lock);
1327         return err;
1328 }
1329
1330 static netdev_features_t team_fix_features(struct net_device *dev,
1331                                            netdev_features_t features)
1332 {
1333         struct team_port *port;
1334         struct team *team = netdev_priv(dev);
1335         netdev_features_t mask;
1336
1337         mask = features;
1338         features &= ~NETIF_F_ONE_FOR_ALL;
1339         features |= NETIF_F_ALL_FOR_ALL;
1340
1341         rcu_read_lock();
1342         list_for_each_entry_rcu(port, &team->port_list, list) {
1343                 features = netdev_increment_features(features,
1344                                                      port->dev->features,
1345                                                      mask);
1346         }
1347         rcu_read_unlock();
1348         return features;
1349 }
1350
1351 static const struct net_device_ops team_netdev_ops = {
1352         .ndo_init               = team_init,
1353         .ndo_uninit             = team_uninit,
1354         .ndo_open               = team_open,
1355         .ndo_stop               = team_close,
1356         .ndo_start_xmit         = team_xmit,
1357         .ndo_change_rx_flags    = team_change_rx_flags,
1358         .ndo_set_rx_mode        = team_set_rx_mode,
1359         .ndo_set_mac_address    = team_set_mac_address,
1360         .ndo_change_mtu         = team_change_mtu,
1361         .ndo_get_stats64        = team_get_stats64,
1362         .ndo_vlan_rx_add_vid    = team_vlan_rx_add_vid,
1363         .ndo_vlan_rx_kill_vid   = team_vlan_rx_kill_vid,
1364         .ndo_add_slave          = team_add_slave,
1365         .ndo_del_slave          = team_del_slave,
1366         .ndo_fix_features       = team_fix_features,
1367 };
1368
1369
1370 /***********************
1371  * rt netlink interface
1372  ***********************/
1373
1374 static void team_setup(struct net_device *dev)
1375 {
1376         ether_setup(dev);
1377
1378         dev->netdev_ops = &team_netdev_ops;
1379         dev->destructor = team_destructor;
1380         dev->tx_queue_len = 0;
1381         dev->flags |= IFF_MULTICAST;
1382         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
1383
1384         /*
1385          * Indicate we support unicast address filtering. That way core won't
1386          * bring us to promisc mode in case a unicast addr is added.
1387          * Let this up to underlay drivers.
1388          */
1389         dev->priv_flags |= IFF_UNICAST_FLT;
1390
1391         dev->features |= NETIF_F_LLTX;
1392         dev->features |= NETIF_F_GRO;
1393         dev->hw_features = NETIF_F_HW_VLAN_TX |
1394                            NETIF_F_HW_VLAN_RX |
1395                            NETIF_F_HW_VLAN_FILTER;
1396
1397         dev->features |= dev->hw_features;
1398 }
1399
1400 static int team_newlink(struct net *src_net, struct net_device *dev,
1401                         struct nlattr *tb[], struct nlattr *data[])
1402 {
1403         int err;
1404
1405         if (tb[IFLA_ADDRESS] == NULL)
1406                 eth_hw_addr_random(dev);
1407
1408         err = register_netdevice(dev);
1409         if (err)
1410                 return err;
1411
1412         return 0;
1413 }
1414
1415 static int team_validate(struct nlattr *tb[], struct nlattr *data[])
1416 {
1417         if (tb[IFLA_ADDRESS]) {
1418                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1419                         return -EINVAL;
1420                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1421                         return -EADDRNOTAVAIL;
1422         }
1423         return 0;
1424 }
1425
1426 static struct rtnl_link_ops team_link_ops __read_mostly = {
1427         .kind           = DRV_NAME,
1428         .priv_size      = sizeof(struct team),
1429         .setup          = team_setup,
1430         .newlink        = team_newlink,
1431         .validate       = team_validate,
1432 };
1433
1434
1435 /***********************************
1436  * Generic netlink custom interface
1437  ***********************************/
1438
1439 static struct genl_family team_nl_family = {
1440         .id             = GENL_ID_GENERATE,
1441         .name           = TEAM_GENL_NAME,
1442         .version        = TEAM_GENL_VERSION,
1443         .maxattr        = TEAM_ATTR_MAX,
1444         .netnsok        = true,
1445 };
1446
1447 static const struct nla_policy team_nl_policy[TEAM_ATTR_MAX + 1] = {
1448         [TEAM_ATTR_UNSPEC]                      = { .type = NLA_UNSPEC, },
1449         [TEAM_ATTR_TEAM_IFINDEX]                = { .type = NLA_U32 },
1450         [TEAM_ATTR_LIST_OPTION]                 = { .type = NLA_NESTED },
1451         [TEAM_ATTR_LIST_PORT]                   = { .type = NLA_NESTED },
1452 };
1453
1454 static const struct nla_policy
1455 team_nl_option_policy[TEAM_ATTR_OPTION_MAX + 1] = {
1456         [TEAM_ATTR_OPTION_UNSPEC]               = { .type = NLA_UNSPEC, },
1457         [TEAM_ATTR_OPTION_NAME] = {
1458                 .type = NLA_STRING,
1459                 .len = TEAM_STRING_MAX_LEN,
1460         },
1461         [TEAM_ATTR_OPTION_CHANGED]              = { .type = NLA_FLAG },
1462         [TEAM_ATTR_OPTION_TYPE]                 = { .type = NLA_U8 },
1463         [TEAM_ATTR_OPTION_DATA]                 = { .type = NLA_BINARY },
1464 };
1465
1466 static int team_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
1467 {
1468         struct sk_buff *msg;
1469         void *hdr;
1470         int err;
1471
1472         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1473         if (!msg)
1474                 return -ENOMEM;
1475
1476         hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
1477                           &team_nl_family, 0, TEAM_CMD_NOOP);
1478         if (IS_ERR(hdr)) {
1479                 err = PTR_ERR(hdr);
1480                 goto err_msg_put;
1481         }
1482
1483         genlmsg_end(msg, hdr);
1484
1485         return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
1486
1487 err_msg_put:
1488         nlmsg_free(msg);
1489
1490         return err;
1491 }
1492
1493 /*
1494  * Netlink cmd functions should be locked by following two functions.
1495  * Since dev gets held here, that ensures dev won't disappear in between.
1496  */
1497 static struct team *team_nl_team_get(struct genl_info *info)
1498 {
1499         struct net *net = genl_info_net(info);
1500         int ifindex;
1501         struct net_device *dev;
1502         struct team *team;
1503
1504         if (!info->attrs[TEAM_ATTR_TEAM_IFINDEX])
1505                 return NULL;
1506
1507         ifindex = nla_get_u32(info->attrs[TEAM_ATTR_TEAM_IFINDEX]);
1508         dev = dev_get_by_index(net, ifindex);
1509         if (!dev || dev->netdev_ops != &team_netdev_ops) {
1510                 if (dev)
1511                         dev_put(dev);
1512                 return NULL;
1513         }
1514
1515         team = netdev_priv(dev);
1516         mutex_lock(&team->lock);
1517         return team;
1518 }
1519
1520 static void team_nl_team_put(struct team *team)
1521 {
1522         mutex_unlock(&team->lock);
1523         dev_put(team->dev);
1524 }
1525
1526 static int team_nl_send_generic(struct genl_info *info, struct team *team,
1527                                 int (*fill_func)(struct sk_buff *skb,
1528                                                  struct genl_info *info,
1529                                                  int flags, struct team *team))
1530 {
1531         struct sk_buff *skb;
1532         int err;
1533
1534         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1535         if (!skb)
1536                 return -ENOMEM;
1537
1538         err = fill_func(skb, info, NLM_F_ACK, team);
1539         if (err < 0)
1540                 goto err_fill;
1541
1542         err = genlmsg_unicast(genl_info_net(info), skb, info->snd_pid);
1543         return err;
1544
1545 err_fill:
1546         nlmsg_free(skb);
1547         return err;
1548 }
1549
1550 typedef int team_nl_send_func_t(struct sk_buff *skb,
1551                                 struct team *team, u32 pid);
1552
1553 static int team_nl_send_unicast(struct sk_buff *skb, struct team *team, u32 pid)
1554 {
1555         return genlmsg_unicast(dev_net(team->dev), skb, pid);
1556 }
1557
1558 static int team_nl_fill_one_option_get(struct sk_buff *skb, struct team *team,
1559                                        struct team_option_inst *opt_inst)
1560 {
1561         struct nlattr *option_item;
1562         struct team_option *option = opt_inst->option;
1563         struct team_option_inst_info *opt_inst_info = &opt_inst->info;
1564         struct team_gsetter_ctx ctx;
1565         int err;
1566
1567         ctx.info = opt_inst_info;
1568         err = team_option_get(team, opt_inst, &ctx);
1569         if (err)
1570                 return err;
1571
1572         option_item = nla_nest_start(skb, TEAM_ATTR_ITEM_OPTION);
1573         if (!option_item)
1574                 return -EMSGSIZE;
1575
1576         if (nla_put_string(skb, TEAM_ATTR_OPTION_NAME, option->name))
1577                 goto nest_cancel;
1578         if (opt_inst_info->port &&
1579             nla_put_u32(skb, TEAM_ATTR_OPTION_PORT_IFINDEX,
1580                         opt_inst_info->port->dev->ifindex))
1581                 goto nest_cancel;
1582         if (opt_inst->option->array_size &&
1583             nla_put_u32(skb, TEAM_ATTR_OPTION_ARRAY_INDEX,
1584                         opt_inst_info->array_index))
1585                 goto nest_cancel;
1586
1587         switch (option->type) {
1588         case TEAM_OPTION_TYPE_U32:
1589                 if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_U32))
1590                         goto nest_cancel;
1591                 if (nla_put_u32(skb, TEAM_ATTR_OPTION_DATA, ctx.data.u32_val))
1592                         goto nest_cancel;
1593                 break;
1594         case TEAM_OPTION_TYPE_STRING:
1595                 if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_STRING))
1596                         goto nest_cancel;
1597                 if (nla_put_string(skb, TEAM_ATTR_OPTION_DATA,
1598                                    ctx.data.str_val))
1599                         goto nest_cancel;
1600                 break;
1601         case TEAM_OPTION_TYPE_BINARY:
1602                 if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_BINARY))
1603                         goto nest_cancel;
1604                 if (nla_put(skb, TEAM_ATTR_OPTION_DATA, ctx.data.bin_val.len,
1605                             ctx.data.bin_val.ptr))
1606                         goto nest_cancel;
1607                 break;
1608         case TEAM_OPTION_TYPE_BOOL:
1609                 if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_FLAG))
1610                         goto nest_cancel;
1611                 if (ctx.data.bool_val &&
1612                     nla_put_flag(skb, TEAM_ATTR_OPTION_DATA))
1613                         goto nest_cancel;
1614                 break;
1615         default:
1616                 BUG();
1617         }
1618         if (opt_inst->removed && nla_put_flag(skb, TEAM_ATTR_OPTION_REMOVED))
1619                 goto nest_cancel;
1620         if (opt_inst->changed) {
1621                 if (nla_put_flag(skb, TEAM_ATTR_OPTION_CHANGED))
1622                         goto nest_cancel;
1623                 opt_inst->changed = false;
1624         }
1625         nla_nest_end(skb, option_item);
1626         return 0;
1627
1628 nest_cancel:
1629         nla_nest_cancel(skb, option_item);
1630         return -EMSGSIZE;
1631 }
1632
1633 static int __send_and_alloc_skb(struct sk_buff **pskb,
1634                                 struct team *team, u32 pid,
1635                                 team_nl_send_func_t *send_func)
1636 {
1637         int err;
1638
1639         if (*pskb) {
1640                 err = send_func(*pskb, team, pid);
1641                 if (err)
1642                         return err;
1643         }
1644         *pskb = genlmsg_new(NLMSG_DEFAULT_SIZE - GENL_HDRLEN, GFP_KERNEL);
1645         if (!*pskb)
1646                 return -ENOMEM;
1647         return 0;
1648 }
1649
1650 static int team_nl_send_options_get(struct team *team, u32 pid, u32 seq,
1651                                     int flags, team_nl_send_func_t *send_func,
1652                                     struct list_head *sel_opt_inst_list)
1653 {
1654         struct nlattr *option_list;
1655         struct nlmsghdr *nlh;
1656         void *hdr;
1657         struct team_option_inst *opt_inst;
1658         int err;
1659         struct sk_buff *skb = NULL;
1660         bool incomplete;
1661         int i;
1662
1663         opt_inst = list_first_entry(sel_opt_inst_list,
1664                                     struct team_option_inst, tmp_list);
1665
1666 start_again:
1667         err = __send_and_alloc_skb(&skb, team, pid, send_func);
1668         if (err)
1669                 return err;
1670
1671         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags | NLM_F_MULTI,
1672                           TEAM_CMD_OPTIONS_GET);
1673         if (IS_ERR(hdr))
1674                 return PTR_ERR(hdr);
1675
1676         if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
1677                 goto nla_put_failure;
1678         option_list = nla_nest_start(skb, TEAM_ATTR_LIST_OPTION);
1679         if (!option_list)
1680                 goto nla_put_failure;
1681
1682         i = 0;
1683         incomplete = false;
1684         list_for_each_entry_from(opt_inst, sel_opt_inst_list, tmp_list) {
1685                 err = team_nl_fill_one_option_get(skb, team, opt_inst);
1686                 if (err) {
1687                         if (err == -EMSGSIZE) {
1688                                 if (!i)
1689                                         goto errout;
1690                                 incomplete = true;
1691                                 break;
1692                         }
1693                         goto errout;
1694                 }
1695                 i++;
1696         }
1697
1698         nla_nest_end(skb, option_list);
1699         genlmsg_end(skb, hdr);
1700         if (incomplete)
1701                 goto start_again;
1702
1703 send_done:
1704         nlh = nlmsg_put(skb, pid, seq, NLMSG_DONE, 0, flags | NLM_F_MULTI);
1705         if (!nlh) {
1706                 err = __send_and_alloc_skb(&skb, team, pid, send_func);
1707                 if (err)
1708                         goto errout;
1709                 goto send_done;
1710         }
1711
1712         return send_func(skb, team, pid);
1713
1714 nla_put_failure:
1715         err = -EMSGSIZE;
1716 errout:
1717         genlmsg_cancel(skb, hdr);
1718         nlmsg_free(skb);
1719         return err;
1720 }
1721
1722 static int team_nl_cmd_options_get(struct sk_buff *skb, struct genl_info *info)
1723 {
1724         struct team *team;
1725         struct team_option_inst *opt_inst;
1726         int err;
1727         LIST_HEAD(sel_opt_inst_list);
1728
1729         team = team_nl_team_get(info);
1730         if (!team)
1731                 return -EINVAL;
1732
1733         list_for_each_entry(opt_inst, &team->option_inst_list, list)
1734                 list_add_tail(&opt_inst->tmp_list, &sel_opt_inst_list);
1735         err = team_nl_send_options_get(team, info->snd_pid, info->snd_seq,
1736                                        NLM_F_ACK, team_nl_send_unicast,
1737                                        &sel_opt_inst_list);
1738
1739         team_nl_team_put(team);
1740
1741         return err;
1742 }
1743
1744 static int team_nl_send_event_options_get(struct team *team,
1745                                           struct list_head *sel_opt_inst_list);
1746
1747 static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
1748 {
1749         struct team *team;
1750         int err = 0;
1751         int i;
1752         struct nlattr *nl_option;
1753         LIST_HEAD(opt_inst_list);
1754
1755         team = team_nl_team_get(info);
1756         if (!team)
1757                 return -EINVAL;
1758
1759         err = -EINVAL;
1760         if (!info->attrs[TEAM_ATTR_LIST_OPTION]) {
1761                 err = -EINVAL;
1762                 goto team_put;
1763         }
1764
1765         nla_for_each_nested(nl_option, info->attrs[TEAM_ATTR_LIST_OPTION], i) {
1766                 struct nlattr *opt_attrs[TEAM_ATTR_OPTION_MAX + 1];
1767                 struct nlattr *attr;
1768                 struct nlattr *attr_data;
1769                 enum team_option_type opt_type;
1770                 int opt_port_ifindex = 0; /* != 0 for per-port options */
1771                 u32 opt_array_index = 0;
1772                 bool opt_is_array = false;
1773                 struct team_option_inst *opt_inst;
1774                 char *opt_name;
1775                 bool opt_found = false;
1776
1777                 if (nla_type(nl_option) != TEAM_ATTR_ITEM_OPTION) {
1778                         err = -EINVAL;
1779                         goto team_put;
1780                 }
1781                 err = nla_parse_nested(opt_attrs, TEAM_ATTR_OPTION_MAX,
1782                                        nl_option, team_nl_option_policy);
1783                 if (err)
1784                         goto team_put;
1785                 if (!opt_attrs[TEAM_ATTR_OPTION_NAME] ||
1786                     !opt_attrs[TEAM_ATTR_OPTION_TYPE]) {
1787                         err = -EINVAL;
1788                         goto team_put;
1789                 }
1790                 switch (nla_get_u8(opt_attrs[TEAM_ATTR_OPTION_TYPE])) {
1791                 case NLA_U32:
1792                         opt_type = TEAM_OPTION_TYPE_U32;
1793                         break;
1794                 case NLA_STRING:
1795                         opt_type = TEAM_OPTION_TYPE_STRING;
1796                         break;
1797                 case NLA_BINARY:
1798                         opt_type = TEAM_OPTION_TYPE_BINARY;
1799                         break;
1800                 case NLA_FLAG:
1801                         opt_type = TEAM_OPTION_TYPE_BOOL;
1802                         break;
1803                 default:
1804                         goto team_put;
1805                 }
1806
1807                 attr_data = opt_attrs[TEAM_ATTR_OPTION_DATA];
1808                 if (opt_type != TEAM_OPTION_TYPE_BOOL && !attr_data) {
1809                         err = -EINVAL;
1810                         goto team_put;
1811                 }
1812
1813                 opt_name = nla_data(opt_attrs[TEAM_ATTR_OPTION_NAME]);
1814                 attr = opt_attrs[TEAM_ATTR_OPTION_PORT_IFINDEX];
1815                 if (attr)
1816                         opt_port_ifindex = nla_get_u32(attr);
1817
1818                 attr = opt_attrs[TEAM_ATTR_OPTION_ARRAY_INDEX];
1819                 if (attr) {
1820                         opt_is_array = true;
1821                         opt_array_index = nla_get_u32(attr);
1822                 }
1823
1824                 list_for_each_entry(opt_inst, &team->option_inst_list, list) {
1825                         struct team_option *option = opt_inst->option;
1826                         struct team_gsetter_ctx ctx;
1827                         struct team_option_inst_info *opt_inst_info;
1828                         int tmp_ifindex;
1829
1830                         opt_inst_info = &opt_inst->info;
1831                         tmp_ifindex = opt_inst_info->port ?
1832                                       opt_inst_info->port->dev->ifindex : 0;
1833                         if (option->type != opt_type ||
1834                             strcmp(option->name, opt_name) ||
1835                             tmp_ifindex != opt_port_ifindex ||
1836                             (option->array_size && !opt_is_array) ||
1837                             opt_inst_info->array_index != opt_array_index)
1838                                 continue;
1839                         opt_found = true;
1840                         ctx.info = opt_inst_info;
1841                         switch (opt_type) {
1842                         case TEAM_OPTION_TYPE_U32:
1843                                 ctx.data.u32_val = nla_get_u32(attr_data);
1844                                 break;
1845                         case TEAM_OPTION_TYPE_STRING:
1846                                 if (nla_len(attr_data) > TEAM_STRING_MAX_LEN) {
1847                                         err = -EINVAL;
1848                                         goto team_put;
1849                                 }
1850                                 ctx.data.str_val = nla_data(attr_data);
1851                                 break;
1852                         case TEAM_OPTION_TYPE_BINARY:
1853                                 ctx.data.bin_val.len = nla_len(attr_data);
1854                                 ctx.data.bin_val.ptr = nla_data(attr_data);
1855                                 break;
1856                         case TEAM_OPTION_TYPE_BOOL:
1857                                 ctx.data.bool_val = attr_data ? true : false;
1858                                 break;
1859                         default:
1860                                 BUG();
1861                         }
1862                         err = team_option_set(team, opt_inst, &ctx);
1863                         if (err)
1864                                 goto team_put;
1865                         opt_inst->changed = true;
1866                         list_add(&opt_inst->tmp_list, &opt_inst_list);
1867                 }
1868                 if (!opt_found) {
1869                         err = -ENOENT;
1870                         goto team_put;
1871                 }
1872         }
1873
1874         err = team_nl_send_event_options_get(team, &opt_inst_list);
1875
1876 team_put:
1877         team_nl_team_put(team);
1878
1879         return err;
1880 }
1881
1882 static int team_nl_fill_port_list_get(struct sk_buff *skb,
1883                                       u32 pid, u32 seq, int flags,
1884                                       struct team *team,
1885                                       bool fillall)
1886 {
1887         struct nlattr *port_list;
1888         void *hdr;
1889         struct team_port *port;
1890
1891         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags,
1892                           TEAM_CMD_PORT_LIST_GET);
1893         if (IS_ERR(hdr))
1894                 return PTR_ERR(hdr);
1895
1896         if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
1897                 goto nla_put_failure;
1898         port_list = nla_nest_start(skb, TEAM_ATTR_LIST_PORT);
1899         if (!port_list)
1900                 goto nla_put_failure;
1901
1902         list_for_each_entry(port, &team->port_list, list) {
1903                 struct nlattr *port_item;
1904
1905                 /* Include only changed ports if fill all mode is not on */
1906                 if (!fillall && !port->changed)
1907                         continue;
1908                 port_item = nla_nest_start(skb, TEAM_ATTR_ITEM_PORT);
1909                 if (!port_item)
1910                         goto nla_put_failure;
1911                 if (nla_put_u32(skb, TEAM_ATTR_PORT_IFINDEX, port->dev->ifindex))
1912                         goto nla_put_failure;
1913                 if (port->changed) {
1914                         if (nla_put_flag(skb, TEAM_ATTR_PORT_CHANGED))
1915                                 goto nla_put_failure;
1916                         port->changed = false;
1917                 }
1918                 if ((port->removed &&
1919                      nla_put_flag(skb, TEAM_ATTR_PORT_REMOVED)) ||
1920                     (port->state.linkup &&
1921                      nla_put_flag(skb, TEAM_ATTR_PORT_LINKUP)) ||
1922                     nla_put_u32(skb, TEAM_ATTR_PORT_SPEED, port->state.speed) ||
1923                     nla_put_u8(skb, TEAM_ATTR_PORT_DUPLEX, port->state.duplex))
1924                         goto nla_put_failure;
1925                 nla_nest_end(skb, port_item);
1926         }
1927
1928         nla_nest_end(skb, port_list);
1929         return genlmsg_end(skb, hdr);
1930
1931 nla_put_failure:
1932         genlmsg_cancel(skb, hdr);
1933         return -EMSGSIZE;
1934 }
1935
1936 static int team_nl_fill_port_list_get_all(struct sk_buff *skb,
1937                                           struct genl_info *info, int flags,
1938                                           struct team *team)
1939 {
1940         return team_nl_fill_port_list_get(skb, info->snd_pid,
1941                                           info->snd_seq, NLM_F_ACK,
1942                                           team, true);
1943 }
1944
1945 static int team_nl_cmd_port_list_get(struct sk_buff *skb,
1946                                      struct genl_info *info)
1947 {
1948         struct team *team;
1949         int err;
1950
1951         team = team_nl_team_get(info);
1952         if (!team)
1953                 return -EINVAL;
1954
1955         err = team_nl_send_generic(info, team, team_nl_fill_port_list_get_all);
1956
1957         team_nl_team_put(team);
1958
1959         return err;
1960 }
1961
1962 static struct genl_ops team_nl_ops[] = {
1963         {
1964                 .cmd = TEAM_CMD_NOOP,
1965                 .doit = team_nl_cmd_noop,
1966                 .policy = team_nl_policy,
1967         },
1968         {
1969                 .cmd = TEAM_CMD_OPTIONS_SET,
1970                 .doit = team_nl_cmd_options_set,
1971                 .policy = team_nl_policy,
1972                 .flags = GENL_ADMIN_PERM,
1973         },
1974         {
1975                 .cmd = TEAM_CMD_OPTIONS_GET,
1976                 .doit = team_nl_cmd_options_get,
1977                 .policy = team_nl_policy,
1978                 .flags = GENL_ADMIN_PERM,
1979         },
1980         {
1981                 .cmd = TEAM_CMD_PORT_LIST_GET,
1982                 .doit = team_nl_cmd_port_list_get,
1983                 .policy = team_nl_policy,
1984                 .flags = GENL_ADMIN_PERM,
1985         },
1986 };
1987
1988 static struct genl_multicast_group team_change_event_mcgrp = {
1989         .name = TEAM_GENL_CHANGE_EVENT_MC_GRP_NAME,
1990 };
1991
1992 static int team_nl_send_multicast(struct sk_buff *skb,
1993                                   struct team *team, u32 pid)
1994 {
1995         return genlmsg_multicast_netns(dev_net(team->dev), skb, 0,
1996                                        team_change_event_mcgrp.id, GFP_KERNEL);
1997 }
1998
1999 static int team_nl_send_event_options_get(struct team *team,
2000                                           struct list_head *sel_opt_inst_list)
2001 {
2002         return team_nl_send_options_get(team, 0, 0, 0, team_nl_send_multicast,
2003                                         sel_opt_inst_list);
2004 }
2005
2006 static int team_nl_send_event_port_list_get(struct team *team)
2007 {
2008         struct sk_buff *skb;
2009         int err;
2010         struct net *net = dev_net(team->dev);
2011
2012         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
2013         if (!skb)
2014                 return -ENOMEM;
2015
2016         err = team_nl_fill_port_list_get(skb, 0, 0, 0, team, false);
2017         if (err < 0)
2018                 goto err_fill;
2019
2020         err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id,
2021                                       GFP_KERNEL);
2022         return err;
2023
2024 err_fill:
2025         nlmsg_free(skb);
2026         return err;
2027 }
2028
2029 static int team_nl_init(void)
2030 {
2031         int err;
2032
2033         err = genl_register_family_with_ops(&team_nl_family, team_nl_ops,
2034                                             ARRAY_SIZE(team_nl_ops));
2035         if (err)
2036                 return err;
2037
2038         err = genl_register_mc_group(&team_nl_family, &team_change_event_mcgrp);
2039         if (err)
2040                 goto err_change_event_grp_reg;
2041
2042         return 0;
2043
2044 err_change_event_grp_reg:
2045         genl_unregister_family(&team_nl_family);
2046
2047         return err;
2048 }
2049
2050 static void team_nl_fini(void)
2051 {
2052         genl_unregister_family(&team_nl_family);
2053 }
2054
2055
2056 /******************
2057  * Change checkers
2058  ******************/
2059
2060 static void __team_options_change_check(struct team *team)
2061 {
2062         int err;
2063         struct team_option_inst *opt_inst;
2064         LIST_HEAD(sel_opt_inst_list);
2065
2066         list_for_each_entry(opt_inst, &team->option_inst_list, list) {
2067                 if (opt_inst->changed)
2068                         list_add_tail(&opt_inst->tmp_list, &sel_opt_inst_list);
2069         }
2070         err = team_nl_send_event_options_get(team, &sel_opt_inst_list);
2071         if (err)
2072                 netdev_warn(team->dev, "Failed to send options change via netlink (err %d)\n",
2073                             err);
2074 }
2075
2076 /* rtnl lock is held */
2077 static void __team_port_change_check(struct team_port *port, bool linkup)
2078 {
2079         int err;
2080
2081         if (!port->removed && port->state.linkup == linkup)
2082                 return;
2083
2084         port->changed = true;
2085         port->state.linkup = linkup;
2086         team_refresh_port_linkup(port);
2087         if (linkup) {
2088                 struct ethtool_cmd ecmd;
2089
2090                 err = __ethtool_get_settings(port->dev, &ecmd);
2091                 if (!err) {
2092                         port->state.speed = ethtool_cmd_speed(&ecmd);
2093                         port->state.duplex = ecmd.duplex;
2094                         goto send_event;
2095                 }
2096         }
2097         port->state.speed = 0;
2098         port->state.duplex = 0;
2099
2100 send_event:
2101         err = team_nl_send_event_port_list_get(port->team);
2102         if (err)
2103                 netdev_warn(port->team->dev, "Failed to send port change of device %s via netlink\n",
2104                             port->dev->name);
2105
2106 }
2107
2108 static void team_port_change_check(struct team_port *port, bool linkup)
2109 {
2110         struct team *team = port->team;
2111
2112         mutex_lock(&team->lock);
2113         __team_port_change_check(port, linkup);
2114         mutex_unlock(&team->lock);
2115 }
2116
2117
2118 /************************************
2119  * Net device notifier event handler
2120  ************************************/
2121
2122 static int team_device_event(struct notifier_block *unused,
2123                              unsigned long event, void *ptr)
2124 {
2125         struct net_device *dev = (struct net_device *) ptr;
2126         struct team_port *port;
2127
2128         port = team_port_get_rtnl(dev);
2129         if (!port)
2130                 return NOTIFY_DONE;
2131
2132         switch (event) {
2133         case NETDEV_UP:
2134                 if (netif_carrier_ok(dev))
2135                         team_port_change_check(port, true);
2136         case NETDEV_DOWN:
2137                 team_port_change_check(port, false);
2138         case NETDEV_CHANGE:
2139                 if (netif_running(port->dev))
2140                         team_port_change_check(port,
2141                                                !!netif_carrier_ok(port->dev));
2142                 break;
2143         case NETDEV_UNREGISTER:
2144                 team_del_slave(port->team->dev, dev);
2145                 break;
2146         case NETDEV_FEAT_CHANGE:
2147                 team_compute_features(port->team);
2148                 break;
2149         case NETDEV_CHANGEMTU:
2150                 /* Forbid to change mtu of underlaying device */
2151                 return NOTIFY_BAD;
2152         case NETDEV_PRE_TYPE_CHANGE:
2153                 /* Forbid to change type of underlaying device */
2154                 return NOTIFY_BAD;
2155         }
2156         return NOTIFY_DONE;
2157 }
2158
2159 static struct notifier_block team_notifier_block __read_mostly = {
2160         .notifier_call = team_device_event,
2161 };
2162
2163
2164 /***********************
2165  * Module init and exit
2166  ***********************/
2167
2168 static int __init team_module_init(void)
2169 {
2170         int err;
2171
2172         register_netdevice_notifier(&team_notifier_block);
2173
2174         err = rtnl_link_register(&team_link_ops);
2175         if (err)
2176                 goto err_rtnl_reg;
2177
2178         err = team_nl_init();
2179         if (err)
2180                 goto err_nl_init;
2181
2182         return 0;
2183
2184 err_nl_init:
2185         rtnl_link_unregister(&team_link_ops);
2186
2187 err_rtnl_reg:
2188         unregister_netdevice_notifier(&team_notifier_block);
2189
2190         return err;
2191 }
2192
2193 static void __exit team_module_exit(void)
2194 {
2195         team_nl_fini();
2196         rtnl_link_unregister(&team_link_ops);
2197         unregister_netdevice_notifier(&team_notifier_block);
2198 }
2199
2200 module_init(team_module_init);
2201 module_exit(team_module_exit);
2202
2203 MODULE_LICENSE("GPL v2");
2204 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
2205 MODULE_DESCRIPTION("Ethernet team device driver");
2206 MODULE_ALIAS_RTNL_LINK(DRV_NAME);