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, int en_port_count)
 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 (!en_port_count || !team_is_mode_set(team) ||
 519             !team->mode->ops->transmit)
 520                 team->ops.transmit = team_dummy_transmit;
 521         else
 522                 team->ops.transmit = team->mode->ops->transmit;
 523
 524         if (!en_port_count || !team_is_mode_set(team) ||
 525             !team->mode->ops->receive)
 526                 team->ops.receive = team_dummy_receive;
 527         else
 528                 team->ops.receive = team->mode->ops->receive;
 529 }
 530
 531 static void team_adjust_ops(struct team *team)
 532 {
 533         __team_adjust_ops(team, team->en_port_count);
 534 }
 535
 536 /*
 537  * We can benefit from the fact that it's ensured no port is present
 538  * at the time of mode change. Therefore no packets are in fly so there's no
 539  * need to set mode operations in any special way.
 540  */
 541 static int __team_change_mode(struct team *team,
 542                               const struct team_mode *new_mode)
 543 {
 544         /* Check if mode was previously set and do cleanup if so */
 545         if (team_is_mode_set(team)) {
 546                 void (*exit_op)(struct team *team) = team->ops.exit;
 547
 548                 /* Clear ops area so no callback is called any longer */
 549                 memset(&team->ops, 0, sizeof(struct team_mode_ops));
 550                 team_adjust_ops(team);
 551
 552                 if (exit_op)
 553                         exit_op(team);
 554                 team_mode_put(team->mode);
 555                 team_set_no_mode(team);
 556                 /* zero private data area */
 557                 memset(&team->mode_priv, 0,
 558                        sizeof(struct team) - offsetof(struct team, mode_priv));
 559         }
 560
 561         if (!new_mode)
 562                 return 0;
 563
 564         if (new_mode->ops->init) {
 565                 int err;
 566
 567                 err = new_mode->ops->init(team);
 568                 if (err)
 569                         return err;
 570         }
 571
 572         team->mode = new_mode;
 573         memcpy(&team->ops, new_mode->ops, sizeof(struct team_mode_ops));
 574         team_adjust_ops(team);
 575
 576         return 0;
 577 }
 578
 579 static int team_change_mode(struct team *team, const char *kind)
 580 {
 581         const struct team_mode *new_mode;
 582         struct net_device *dev = team->dev;
 583         int err;
 584
 585         if (!list_empty(&team->port_list)) {
 586                 netdev_err(dev, "No ports can be present during mode change\n");
 587                 return -EBUSY;
 588         }
 589
 590         if (team_is_mode_set(team) && strcmp(team->mode->kind, kind) == 0) {
 591                 netdev_err(dev, "Unable to change to the same mode the team is in\n");
 592                 return -EINVAL;
 593         }
 594
 595         new_mode = team_mode_get(kind);
 596         if (!new_mode) {
 597                 netdev_err(dev, "Mode \"%s\" not found\n", kind);
 598                 return -EINVAL;
 599         }
 600
 601         err = __team_change_mode(team, new_mode);
 602         if (err) {
 603                 netdev_err(dev, "Failed to change to mode \"%s\"\n", kind);
 604                 team_mode_put(new_mode);
 605                 return err;
 606         }
 607
 608         netdev_info(dev, "Mode changed to \"%s\"\n", kind);
 609         return 0;
 610 }
 611
 612
 613 /************************
 614  * Rx path frame handler
 615  ************************/
 616
 617 /* note: already called with rcu_read_lock */
 618 static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
 619 {
 620         struct sk_buff *skb = *pskb;
 621         struct team_port *port;
 622         struct team *team;
 623         rx_handler_result_t res;
 624
 625         skb = skb_share_check(skb, GFP_ATOMIC);
 626         if (!skb)
 627                 return RX_HANDLER_CONSUMED;
 628
 629         *pskb = skb;
 630
 631         port = team_port_get_rcu(skb->dev);
 632         team = port->team;
 633         if (!team_port_enabled(port)) {
 634                 /* allow exact match delivery for disabled ports */
 635                 res = RX_HANDLER_EXACT;
 636         } else {
 637                 res = team->ops.receive(team, port, skb);
 638         }
 639         if (res == RX_HANDLER_ANOTHER) {
 640                 struct team_pcpu_stats *pcpu_stats;
 641
 642                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
 643                 u64_stats_update_begin(&pcpu_stats->syncp);
 644                 pcpu_stats->rx_packets++;
 645                 pcpu_stats->rx_bytes += skb->len;
 646                 if (skb->pkt_type == PACKET_MULTICAST)
 647                         pcpu_stats->rx_multicast++;
 648                 u64_stats_update_end(&pcpu_stats->syncp);
 649
 650                 skb->dev = team->dev;
 651         } else {
 652                 this_cpu_inc(team->pcpu_stats->rx_dropped);
 653         }
 654
 655         return res;
 656 }
 657
 658
 659 /****************
 660  * Port handling
 661  ****************/
 662
 663 static bool team_port_find(const struct team *team,
 664                            const struct team_port *port)
 665 {
 666         struct team_port *cur;
 667
 668         list_for_each_entry(cur, &team->port_list, list)
 669                 if (cur == port)
 670                         return true;
 671         return false;
 672 }
 673
 674 bool team_port_enabled(struct team_port *port)
 675 {
 676         return port->index != -1;
 677 }
 678 EXPORT_SYMBOL(team_port_enabled);
 679
 680 /*
 681  * Enable/disable port by adding to enabled port hashlist and setting
 682  * port->index (Might be racy so reader could see incorrect ifindex when
 683  * processing a flying packet, but that is not a problem). Write guarded
 684  * by team->lock.
 685  */
 686 static void team_port_enable(struct team *team,
 687                              struct team_port *port)
 688 {
 689         if (team_port_enabled(port))
 690                 return;
 691         port->index = team->en_port_count++;
 692         hlist_add_head_rcu(&port->hlist,
 693                            team_port_index_hash(team, port->index));
 694         team_adjust_ops(team);
 695         if (team->ops.port_enabled)
 696                 team->ops.port_enabled(team, port);
 697 }
 698
 699 static void __reconstruct_port_hlist(struct team *team, int rm_index)
 700 {
 701         int i;
 702         struct team_port *port;
 703
 704         for (i = rm_index + 1; i < team->en_port_count; i++) {
 705                 port = team_get_port_by_index(team, i);
 706                 hlist_del_rcu(&port->hlist);
 707                 port->index--;
 708                 hlist_add_head_rcu(&port->hlist,
 709                                    team_port_index_hash(team, port->index));
 710         }
 711 }
 712
 713 static void team_port_disable(struct team *team,
 714                               struct team_port *port)
 715 {
 716         if (!team_port_enabled(port))
 717                 return;
 718         if (team->ops.port_disabled)
 719                 team->ops.port_disabled(team, port);
 720         hlist_del_rcu(&port->hlist);
 721         __reconstruct_port_hlist(team, port->index);
 722         port->index = -1;
 723         __team_adjust_ops(team, team->en_port_count - 1);
 724         /*
 725          * Wait until readers see adjusted ops. This ensures that
 726          * readers never see team->en_port_count == 0
 727          */
 728         synchronize_rcu();
 729         team->en_port_count--;
 730 }
 731
 732 #define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
 733                             NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
 734                             NETIF_F_HIGHDMA | NETIF_F_LRO)
 735
 736 static void __team_compute_features(struct team *team)
 737 {
 738         struct team_port *port;
 739         u32 vlan_features = TEAM_VLAN_FEATURES;
 740         unsigned short max_hard_header_len = ETH_HLEN;
 741
 742         list_for_each_entry(port, &team->port_list, list) {
 743                 vlan_features = netdev_increment_features(vlan_features,
 744                                         port->dev->vlan_features,
 745                                         TEAM_VLAN_FEATURES);
 746
 747                 if (port->dev->hard_header_len > max_hard_header_len)
 748                         max_hard_header_len = port->dev->hard_header_len;
 749         }
 750
 751         team->dev->vlan_features = vlan_features;
 752         team->dev->hard_header_len = max_hard_header_len;
 753
 754         netdev_change_features(team->dev);
 755 }
 756
 757 static void team_compute_features(struct team *team)
 758 {
 759         mutex_lock(&team->lock);
 760         __team_compute_features(team);
 761         mutex_unlock(&team->lock);
 762 }
 763
 764 static int team_port_enter(struct team *team, struct team_port *port)
 765 {
 766         int err = 0;
 767
 768         dev_hold(team->dev);
 769         port->dev->priv_flags |= IFF_TEAM_PORT;
 770         if (team->ops.port_enter) {
 771                 err = team->ops.port_enter(team, port);
 772                 if (err) {
 773                         netdev_err(team->dev, "Device %s failed to enter team mode\n",
 774                                    port->dev->name);
 775                         goto err_port_enter;
 776                 }
 777         }
 778
 779         return 0;
 780
 781 err_port_enter:
 782         port->dev->priv_flags &= ~IFF_TEAM_PORT;
 783         dev_put(team->dev);
 784
 785         return err;
 786 }
 787
 788 static void team_port_leave(struct team *team, struct team_port *port)
 789 {
 790         if (team->ops.port_leave)
 791                 team->ops.port_leave(team, port);
 792         port->dev->priv_flags &= ~IFF_TEAM_PORT;
 793         dev_put(team->dev);
 794 }
 795
 796 static void __team_port_change_check(struct team_port *port, bool linkup);
 797
 798 static int team_port_add(struct team *team, struct net_device *port_dev)
 799 {
 800         struct net_device *dev = team->dev;
 801         struct team_port *port;
 802         char *portname = port_dev->name;
 803         int err;
 804
 805         if (port_dev->flags & IFF_LOOPBACK ||
 806             port_dev->type != ARPHRD_ETHER) {
 807                 netdev_err(dev, "Device %s is of an unsupported type\n",
 808                            portname);
 809                 return -EINVAL;
 810         }
 811
 812         if (team_port_exists(port_dev)) {
 813                 netdev_err(dev, "Device %s is already a port "
 814                                 "of a team device\n", portname);
 815                 return -EBUSY;
 816         }
 817
 818         if (port_dev->flags & IFF_UP) {
 819                 netdev_err(dev, "Device %s is up. Set it down before adding it as a team port\n",
 820                            portname);
 821                 return -EBUSY;
 822         }
 823
 824         port = kzalloc(sizeof(struct team_port) + team->mode->port_priv_size,
 825                        GFP_KERNEL);
 826         if (!port)
 827                 return -ENOMEM;
 828
 829         port->dev = port_dev;
 830         port->team = team;
 831
 832         port->orig.mtu = port_dev->mtu;
 833         err = dev_set_mtu(port_dev, dev->mtu);
 834         if (err) {
 835                 netdev_dbg(dev, "Error %d calling dev_set_mtu\n", err);
 836                 goto err_set_mtu;
 837         }
 838
 839         memcpy(port->orig.dev_addr, port_dev->dev_addr, ETH_ALEN);
 840
 841         err = team_port_enter(team, port);
 842         if (err) {
 843                 netdev_err(dev, "Device %s failed to enter team mode\n",
 844                            portname);
 845                 goto err_port_enter;
 846         }
 847
 848         err = dev_open(port_dev);
 849         if (err) {
 850                 netdev_dbg(dev, "Device %s opening failed\n",
 851                            portname);
 852                 goto err_dev_open;
 853         }
 854
 855         err = vlan_vids_add_by_dev(port_dev, dev);
 856         if (err) {
 857                 netdev_err(dev, "Failed to add vlan ids to device %s\n",
 858                                 portname);
 859                 goto err_vids_add;
 860         }
 861
 862         err = netdev_set_master(port_dev, dev);
 863         if (err) {
 864                 netdev_err(dev, "Device %s failed to set master\n", portname);
 865                 goto err_set_master;
 866         }
 867
 868         err = netdev_rx_handler_register(port_dev, team_handle_frame,
 869                                          port);
 870         if (err) {
 871                 netdev_err(dev, "Device %s failed to register rx_handler\n",
 872                            portname);
 873                 goto err_handler_register;
 874         }
 875
 876         err = __team_option_inst_add_port(team, port);
 877         if (err) {
 878                 netdev_err(dev, "Device %s failed to add per-port options\n",
 879                            portname);
 880                 goto err_option_port_add;
 881         }
 882
 883         port->index = -1;
 884         team_port_enable(team, port);
 885         list_add_tail_rcu(&port->list, &team->port_list);
 886         __team_compute_features(team);
 887         __team_port_change_check(port, !!netif_carrier_ok(port_dev));
 888         __team_options_change_check(team);
 889
 890         netdev_info(dev, "Port device %s added\n", portname);
 891
 892         return 0;
 893
 894 err_option_port_add:
 895         netdev_rx_handler_unregister(port_dev);
 896
 897 err_handler_register:
 898         netdev_set_master(port_dev, NULL);
 899
 900 err_set_master:
 901         vlan_vids_del_by_dev(port_dev, dev);
 902
 903 err_vids_add:
 904         dev_close(port_dev);
 905
 906 err_dev_open:
 907         team_port_leave(team, port);
 908         team_port_set_orig_mac(port);
 909
 910 err_port_enter:
 911         dev_set_mtu(port_dev, port->orig.mtu);
 912
 913 err_set_mtu:
 914         kfree(port);
 915
 916         return err;
 917 }
 918
 919 static int team_port_del(struct team *team, struct net_device *port_dev)
 920 {
 921         struct net_device *dev = team->dev;
 922         struct team_port *port;
 923         char *portname = port_dev->name;
 924
 925         port = team_port_get_rtnl(port_dev);
 926         if (!port || !team_port_find(team, port)) {
 927                 netdev_err(dev, "Device %s does not act as a port of this team\n",
 928                            portname);
 929                 return -ENOENT;
 930         }
 931
 932         __team_option_inst_mark_removed_port(team, port);
 933         __team_options_change_check(team);
 934         __team_option_inst_del_port(team, port);
 935         port->removed = true;
 936         __team_port_change_check(port, false);
 937         team_port_disable(team, port);
 938         list_del_rcu(&port->list);
 939         netdev_rx_handler_unregister(port_dev);
 940         netdev_set_master(port_dev, NULL);
 941         vlan_vids_del_by_dev(port_dev, dev);
 942         dev_close(port_dev);
 943         team_port_leave(team, port);
 944         team_port_set_orig_mac(port);
 945         dev_set_mtu(port_dev, port->orig.mtu);
 946         synchronize_rcu();
 947         kfree(port);
 948         netdev_info(dev, "Port device %s removed\n", portname);
 949         __team_compute_features(team);
 950
 951         return 0;
 952 }
 953
 954
 955 /*****************
 956  * Net device ops
 957  *****************/
 958
 959 static int team_mode_option_get(struct team *team, struct team_gsetter_ctx *ctx)
 960 {
 961         ctx->data.str_val = team->mode->kind;
 962         return 0;
 963 }
 964
 965 static int team_mode_option_set(struct team *team, struct team_gsetter_ctx *ctx)
 966 {
 967         return team_change_mode(team, ctx->data.str_val);
 968 }
 969
 970 static int team_port_en_option_get(struct team *team,
 971                                    struct team_gsetter_ctx *ctx)
 972 {
 973         struct team_port *port = ctx->info->port;
 974
 975         ctx->data.bool_val = team_port_enabled(port);
 976         return 0;
 977 }
 978
 979 static int team_port_en_option_set(struct team *team,
 980                                    struct team_gsetter_ctx *ctx)
 981 {
 982         struct team_port *port = ctx->info->port;
 983
 984         if (ctx->data.bool_val)
 985                 team_port_enable(team, port);
 986         else
 987                 team_port_disable(team, port);
 988         return 0;
 989 }
 990
 991 static int team_user_linkup_option_get(struct team *team,
 992                                        struct team_gsetter_ctx *ctx)
 993 {
 994         struct team_port *port = ctx->info->port;
 995
 996         ctx->data.bool_val = port->user.linkup;
 997         return 0;
 998 }
 999
1000 static int team_user_linkup_option_set(struct team *team,
1001                                        struct team_gsetter_ctx *ctx)
1002 {
1003         struct team_port *port = ctx->info->port;
1004
1005         port->user.linkup = ctx->data.bool_val;
1006         team_refresh_port_linkup(port);
1007         return 0;
1008 }
1009
1010 static int team_user_linkup_en_option_get(struct team *team,
1011                                           struct team_gsetter_ctx *ctx)
1012 {
1013         struct team_port *port = ctx->info->port;
1014
1015         ctx->data.bool_val = port->user.linkup_enabled;
1016         return 0;
1017 }
1018
1019 static int team_user_linkup_en_option_set(struct team *team,
1020                                           struct team_gsetter_ctx *ctx)
1021 {
1022         struct team_port *port = ctx->info->port;
1023
1024         port->user.linkup_enabled = ctx->data.bool_val;
1025         team_refresh_port_linkup(port);
1026         return 0;
1027 }
1028
1029 static const struct team_option team_options[] = {
1030         {
1031                 .name = "mode",
1032                 .type = TEAM_OPTION_TYPE_STRING,
1033                 .getter = team_mode_option_get,
1034                 .setter = team_mode_option_set,
1035         },
1036         {
1037                 .name = "enabled",
1038                 .type = TEAM_OPTION_TYPE_BOOL,
1039                 .per_port = true,
1040                 .getter = team_port_en_option_get,
1041                 .setter = team_port_en_option_set,
1042         },
1043         {
1044                 .name = "user_linkup",
1045                 .type = TEAM_OPTION_TYPE_BOOL,
1046                 .per_port = true,
1047                 .getter = team_user_linkup_option_get,
1048                 .setter = team_user_linkup_option_set,
1049         },
1050         {
1051                 .name = "user_linkup_enabled",
1052                 .type = TEAM_OPTION_TYPE_BOOL,
1053                 .per_port = true,
1054                 .getter = team_user_linkup_en_option_get,
1055                 .setter = team_user_linkup_en_option_set,
1056         },
1057 };
1058
1059 static int team_init(struct net_device *dev)
1060 {
1061         struct team *team = netdev_priv(dev);
1062         int i;
1063         int err;
1064
1065         team->dev = dev;
1066         mutex_init(&team->lock);
1067         team_set_no_mode(team);
1068
1069         team->pcpu_stats = alloc_percpu(struct team_pcpu_stats);
1070         if (!team->pcpu_stats)
1071                 return -ENOMEM;
1072
1073         for (i = 0; i < TEAM_PORT_HASHENTRIES; i++)
1074                 INIT_HLIST_HEAD(&team->en_port_hlist[i]);
1075         INIT_LIST_HEAD(&team->port_list);
1076
1077         team_adjust_ops(team);
1078
1079         INIT_LIST_HEAD(&team->option_list);
1080         INIT_LIST_HEAD(&team->option_inst_list);
1081         err = team_options_register(team, team_options, ARRAY_SIZE(team_options));
1082         if (err)
1083                 goto err_options_register;
1084         netif_carrier_off(dev);
1085
1086         return 0;
1087
1088 err_options_register:
1089         free_percpu(team->pcpu_stats);
1090
1091         return err;
1092 }
1093
1094 static void team_uninit(struct net_device *dev)
1095 {
1096         struct team *team = netdev_priv(dev);
1097         struct team_port *port;
1098         struct team_port *tmp;
1099
1100         mutex_lock(&team->lock);
1101         list_for_each_entry_safe(port, tmp, &team->port_list, list)
1102                 team_port_del(team, port->dev);
1103
1104         __team_change_mode(team, NULL); /* cleanup */
1105         __team_options_unregister(team, team_options, ARRAY_SIZE(team_options));
1106         mutex_unlock(&team->lock);
1107 }
1108
1109 static void team_destructor(struct net_device *dev)
1110 {
1111         struct team *team = netdev_priv(dev);
1112
1113         free_percpu(team->pcpu_stats);
1114         free_netdev(dev);
1115 }
1116
1117 static int team_open(struct net_device *dev)
1118 {
1119         netif_carrier_on(dev);
1120         return 0;
1121 }
1122
1123 static int team_close(struct net_device *dev)
1124 {
1125         netif_carrier_off(dev);
1126         return 0;
1127 }
1128
1129 /*
1130  * note: already called with rcu_read_lock
1131  */
1132 static netdev_tx_t team_xmit(struct sk_buff *skb, struct net_device *dev)
1133 {
1134         struct team *team = netdev_priv(dev);
1135         bool tx_success = false;
1136         unsigned int len = skb->len;
1137
1138         tx_success = team->ops.transmit(team, skb);
1139         if (tx_success) {
1140                 struct team_pcpu_stats *pcpu_stats;
1141
1142                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
1143                 u64_stats_update_begin(&pcpu_stats->syncp);
1144                 pcpu_stats->tx_packets++;
1145                 pcpu_stats->tx_bytes += len;
1146                 u64_stats_update_end(&pcpu_stats->syncp);
1147         } else {
1148                 this_cpu_inc(team->pcpu_stats->tx_dropped);
1149         }
1150
1151         return NETDEV_TX_OK;
1152 }
1153
1154 static void team_change_rx_flags(struct net_device *dev, int change)
1155 {
1156         struct team *team = netdev_priv(dev);
1157         struct team_port *port;
1158         int inc;
1159
1160         rcu_read_lock();
1161         list_for_each_entry_rcu(port, &team->port_list, list) {
1162                 if (change & IFF_PROMISC) {
1163                         inc = dev->flags & IFF_PROMISC ? 1 : -1;
1164                         dev_set_promiscuity(port->dev, inc);
1165                 }
1166                 if (change & IFF_ALLMULTI) {
1167                         inc = dev->flags & IFF_ALLMULTI ? 1 : -1;
1168                         dev_set_allmulti(port->dev, inc);
1169                 }
1170         }
1171         rcu_read_unlock();
1172 }
1173
1174 static void team_set_rx_mode(struct net_device *dev)
1175 {
1176         struct team *team = netdev_priv(dev);
1177         struct team_port *port;
1178
1179         rcu_read_lock();
1180         list_for_each_entry_rcu(port, &team->port_list, list) {
1181                 dev_uc_sync(port->dev, dev);
1182                 dev_mc_sync(port->dev, dev);
1183         }
1184         rcu_read_unlock();
1185 }
1186
1187 static int team_set_mac_address(struct net_device *dev, void *p)
1188 {
1189         struct team *team = netdev_priv(dev);
1190         struct team_port *port;
1191         int err;
1192
1193         err = eth_mac_addr(dev, p);
1194         if (err)
1195                 return err;
1196         rcu_read_lock();
1197         list_for_each_entry_rcu(port, &team->port_list, list)
1198                 if (team->ops.port_change_mac)
1199                         team->ops.port_change_mac(team, port);
1200         rcu_read_unlock();
1201         return 0;
1202 }
1203
1204 static int team_change_mtu(struct net_device *dev, int new_mtu)
1205 {
1206         struct team *team = netdev_priv(dev);
1207         struct team_port *port;
1208         int err;
1209
1210         /*
1211          * Alhough this is reader, it's guarded by team lock. It's not possible
1212          * to traverse list in reverse under rcu_read_lock
1213          */
1214         mutex_lock(&team->lock);
1215         list_for_each_entry(port, &team->port_list, list) {
1216                 err = dev_set_mtu(port->dev, new_mtu);
1217                 if (err) {
1218                         netdev_err(dev, "Device %s failed to change mtu",
1219                                    port->dev->name);
1220                         goto unwind;
1221                 }
1222         }
1223         mutex_unlock(&team->lock);
1224
1225         dev->mtu = new_mtu;
1226
1227         return 0;
1228
1229 unwind:
1230         list_for_each_entry_continue_reverse(port, &team->port_list, list)
1231                 dev_set_mtu(port->dev, dev->mtu);
1232         mutex_unlock(&team->lock);
1233
1234         return err;
1235 }
1236
1237 static struct rtnl_link_stats64 *
1238 team_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1239 {
1240         struct team *team = netdev_priv(dev);
1241         struct team_pcpu_stats *p;
1242         u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
1243         u32 rx_dropped = 0, tx_dropped = 0;
1244         unsigned int start;
1245         int i;
1246
1247         for_each_possible_cpu(i) {
1248                 p = per_cpu_ptr(team->pcpu_stats, i);
1249                 do {
1250                         start = u64_stats_fetch_begin_bh(&p->syncp);
1251                         rx_packets      = p->rx_packets;
1252                         rx_bytes        = p->rx_bytes;
1253                         rx_multicast    = p->rx_multicast;
1254                         tx_packets      = p->tx_packets;
1255                         tx_bytes        = p->tx_bytes;
1256                 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
1257
1258                 stats->rx_packets       += rx_packets;
1259                 stats->rx_bytes         += rx_bytes;
1260                 stats->multicast        += rx_multicast;
1261                 stats->tx_packets       += tx_packets;
1262                 stats->tx_bytes         += tx_bytes;
1263                 /*
1264                  * rx_dropped & tx_dropped are u32, updated
1265                  * without syncp protection.
1266                  */
1267                 rx_dropped      += p->rx_dropped;
1268                 tx_dropped      += p->tx_dropped;
1269         }
1270         stats->rx_dropped       = rx_dropped;
1271         stats->tx_dropped       = tx_dropped;
1272         return stats;
1273 }
1274
1275 static int team_vlan_rx_add_vid(struct net_device *dev, uint16_t vid)
1276 {
1277         struct team *team = netdev_priv(dev);
1278         struct team_port *port;
1279         int err;
1280
1281         /*
1282          * Alhough this is reader, it's guarded by team lock. It's not possible
1283          * to traverse list in reverse under rcu_read_lock
1284          */
1285         mutex_lock(&team->lock);
1286         list_for_each_entry(port, &team->port_list, list) {
1287                 err = vlan_vid_add(port->dev, vid);
1288                 if (err)
1289                         goto unwind;
1290         }
1291         mutex_unlock(&team->lock);
1292
1293         return 0;
1294
1295 unwind:
1296         list_for_each_entry_continue_reverse(port, &team->port_list, list)
1297                 vlan_vid_del(port->dev, vid);
1298         mutex_unlock(&team->lock);
1299
1300         return err;
1301 }
1302
1303 static int team_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid)
1304 {
1305         struct team *team = netdev_priv(dev);
1306         struct team_port *port;
1307
1308         rcu_read_lock();
1309         list_for_each_entry_rcu(port, &team->port_list, list)
1310                 vlan_vid_del(port->dev, vid);
1311         rcu_read_unlock();
1312
1313         return 0;
1314 }
1315
1316 static int team_add_slave(struct net_device *dev, struct net_device *port_dev)
1317 {
1318         struct team *team = netdev_priv(dev);
1319         int err;
1320
1321         mutex_lock(&team->lock);
1322         err = team_port_add(team, port_dev);
1323         mutex_unlock(&team->lock);
1324         return err;
1325 }
1326
1327 static int team_del_slave(struct net_device *dev, struct net_device *port_dev)
1328 {
1329         struct team *team = netdev_priv(dev);
1330         int err;
1331
1332         mutex_lock(&team->lock);
1333         err = team_port_del(team, port_dev);
1334         mutex_unlock(&team->lock);
1335         return err;
1336 }
1337
1338 static netdev_features_t team_fix_features(struct net_device *dev,
1339                                            netdev_features_t features)
1340 {
1341         struct team_port *port;
1342         struct team *team = netdev_priv(dev);
1343         netdev_features_t mask;
1344
1345         mask = features;
1346         features &= ~NETIF_F_ONE_FOR_ALL;
1347         features |= NETIF_F_ALL_FOR_ALL;
1348
1349         rcu_read_lock();
1350         list_for_each_entry_rcu(port, &team->port_list, list) {
1351                 features = netdev_increment_features(features,
1352                                                      port->dev->features,
1353                                                      mask);
1354         }
1355         rcu_read_unlock();
1356         return features;
1357 }
1358
1359 static const struct net_device_ops team_netdev_ops = {
1360         .ndo_init               = team_init,
1361         .ndo_uninit             = team_uninit,
1362         .ndo_open               = team_open,
1363         .ndo_stop               = team_close,
1364         .ndo_start_xmit         = team_xmit,
1365         .ndo_change_rx_flags    = team_change_rx_flags,
1366         .ndo_set_rx_mode        = team_set_rx_mode,
1367         .ndo_set_mac_address    = team_set_mac_address,
1368         .ndo_change_mtu         = team_change_mtu,
1369         .ndo_get_stats64        = team_get_stats64,
1370         .ndo_vlan_rx_add_vid    = team_vlan_rx_add_vid,
1371         .ndo_vlan_rx_kill_vid   = team_vlan_rx_kill_vid,
1372         .ndo_add_slave          = team_add_slave,
1373         .ndo_del_slave          = team_del_slave,
1374         .ndo_fix_features       = team_fix_features,
1375 };
1376
1377
1378 /***********************
1379  * rt netlink interface
1380  ***********************/
1381
1382 static void team_setup(struct net_device *dev)
1383 {
1384         ether_setup(dev);
1385
1386         dev->netdev_ops = &team_netdev_ops;
1387         dev->destructor = team_destructor;
1388         dev->tx_queue_len = 0;
1389         dev->flags |= IFF_MULTICAST;
1390         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
1391
1392         /*
1393          * Indicate we support unicast address filtering. That way core won't
1394          * bring us to promisc mode in case a unicast addr is added.
1395          * Let this up to underlay drivers.
1396          */
1397         dev->priv_flags |= IFF_UNICAST_FLT | IFF_LIVE_ADDR_CHANGE;
1398
1399         dev->features |= NETIF_F_LLTX;
1400         dev->features |= NETIF_F_GRO;
1401         dev->hw_features = NETIF_F_HW_VLAN_TX |
1402                            NETIF_F_HW_VLAN_RX |
1403                            NETIF_F_HW_VLAN_FILTER;
1404
1405         dev->features |= dev->hw_features;
1406 }
1407
1408 static int team_newlink(struct net *src_net, struct net_device *dev,
1409                         struct nlattr *tb[], struct nlattr *data[])
1410 {
1411         int err;
1412
1413         if (tb[IFLA_ADDRESS] == NULL)
1414                 eth_hw_addr_random(dev);
1415
1416         err = register_netdevice(dev);
1417         if (err)
1418                 return err;
1419
1420         return 0;
1421 }
1422
1423 static int team_validate(struct nlattr *tb[], struct nlattr *data[])
1424 {
1425         if (tb[IFLA_ADDRESS]) {
1426                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1427                         return -EINVAL;
1428                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1429                         return -EADDRNOTAVAIL;
1430         }
1431         return 0;
1432 }
1433
1434 static struct rtnl_link_ops team_link_ops __read_mostly = {
1435         .kind           = DRV_NAME,
1436         .priv_size      = sizeof(struct team),
1437         .setup          = team_setup,
1438         .newlink        = team_newlink,
1439         .validate       = team_validate,
1440 };
1441
1442
1443 /***********************************
1444  * Generic netlink custom interface
1445  ***********************************/
1446
1447 static struct genl_family team_nl_family = {
1448         .id             = GENL_ID_GENERATE,
1449         .name           = TEAM_GENL_NAME,
1450         .version        = TEAM_GENL_VERSION,
1451         .maxattr        = TEAM_ATTR_MAX,
1452         .netnsok        = true,
1453 };
1454
1455 static const struct nla_policy team_nl_policy[TEAM_ATTR_MAX + 1] = {
1456         [TEAM_ATTR_UNSPEC]                      = { .type = NLA_UNSPEC, },
1457         [TEAM_ATTR_TEAM_IFINDEX]                = { .type = NLA_U32 },
1458         [TEAM_ATTR_LIST_OPTION]                 = { .type = NLA_NESTED },
1459         [TEAM_ATTR_LIST_PORT]                   = { .type = NLA_NESTED },
1460 };
1461
1462 static const struct nla_policy
1463 team_nl_option_policy[TEAM_ATTR_OPTION_MAX + 1] = {
1464         [TEAM_ATTR_OPTION_UNSPEC]               = { .type = NLA_UNSPEC, },
1465         [TEAM_ATTR_OPTION_NAME] = {
1466                 .type = NLA_STRING,
1467                 .len = TEAM_STRING_MAX_LEN,
1468         },
1469         [TEAM_ATTR_OPTION_CHANGED]              = { .type = NLA_FLAG },
1470         [TEAM_ATTR_OPTION_TYPE]                 = { .type = NLA_U8 },
1471         [TEAM_ATTR_OPTION_DATA]                 = { .type = NLA_BINARY },
1472 };
1473
1474 static int team_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
1475 {
1476         struct sk_buff *msg;
1477         void *hdr;
1478         int err;
1479
1480         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1481         if (!msg)
1482                 return -ENOMEM;
1483
1484         hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
1485                           &team_nl_family, 0, TEAM_CMD_NOOP);
1486         if (IS_ERR(hdr)) {
1487                 err = PTR_ERR(hdr);
1488                 goto err_msg_put;
1489         }
1490
1491         genlmsg_end(msg, hdr);
1492
1493         return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
1494
1495 err_msg_put:
1496         nlmsg_free(msg);
1497
1498         return err;
1499 }
1500
1501 /*
1502  * Netlink cmd functions should be locked by following two functions.
1503  * Since dev gets held here, that ensures dev won't disappear in between.
1504  */
1505 static struct team *team_nl_team_get(struct genl_info *info)
1506 {
1507         struct net *net = genl_info_net(info);
1508         int ifindex;
1509         struct net_device *dev;
1510         struct team *team;
1511
1512         if (!info->attrs[TEAM_ATTR_TEAM_IFINDEX])
1513                 return NULL;
1514
1515         ifindex = nla_get_u32(info->attrs[TEAM_ATTR_TEAM_IFINDEX]);
1516         dev = dev_get_by_index(net, ifindex);
1517         if (!dev || dev->netdev_ops != &team_netdev_ops) {
1518                 if (dev)
1519                         dev_put(dev);
1520                 return NULL;
1521         }
1522
1523         team = netdev_priv(dev);
1524         mutex_lock(&team->lock);
1525         return team;
1526 }
1527
1528 static void team_nl_team_put(struct team *team)
1529 {
1530         mutex_unlock(&team->lock);
1531         dev_put(team->dev);
1532 }
1533
1534 static int team_nl_send_generic(struct genl_info *info, struct team *team,
1535                                 int (*fill_func)(struct sk_buff *skb,
1536                                                  struct genl_info *info,
1537                                                  int flags, struct team *team))
1538 {
1539         struct sk_buff *skb;
1540         int err;
1541
1542         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1543         if (!skb)
1544                 return -ENOMEM;
1545
1546         err = fill_func(skb, info, NLM_F_ACK, team);
1547         if (err < 0)
1548                 goto err_fill;
1549
1550         err = genlmsg_unicast(genl_info_net(info), skb, info->snd_pid);
1551         return err;
1552
1553 err_fill:
1554         nlmsg_free(skb);
1555         return err;
1556 }
1557
1558 typedef int team_nl_send_func_t(struct sk_buff *skb,
1559                                 struct team *team, u32 pid);
1560
1561 static int team_nl_send_unicast(struct sk_buff *skb, struct team *team, u32 pid)
1562 {
1563         return genlmsg_unicast(dev_net(team->dev), skb, pid);
1564 }
1565
1566 static int team_nl_fill_one_option_get(struct sk_buff *skb, struct team *team,
1567                                        struct team_option_inst *opt_inst)
1568 {
1569         struct nlattr *option_item;
1570         struct team_option *option = opt_inst->option;
1571         struct team_option_inst_info *opt_inst_info = &opt_inst->info;
1572         struct team_gsetter_ctx ctx;
1573         int err;
1574
1575         ctx.info = opt_inst_info;
1576         err = team_option_get(team, opt_inst, &ctx);
1577         if (err)
1578                 return err;
1579
1580         option_item = nla_nest_start(skb, TEAM_ATTR_ITEM_OPTION);
1581         if (!option_item)
1582                 return -EMSGSIZE;
1583
1584         if (nla_put_string(skb, TEAM_ATTR_OPTION_NAME, option->name))
1585                 goto nest_cancel;
1586         if (opt_inst_info->port &&
1587             nla_put_u32(skb, TEAM_ATTR_OPTION_PORT_IFINDEX,
1588                         opt_inst_info->port->dev->ifindex))
1589                 goto nest_cancel;
1590         if (opt_inst->option->array_size &&
1591             nla_put_u32(skb, TEAM_ATTR_OPTION_ARRAY_INDEX,
1592                         opt_inst_info->array_index))
1593                 goto nest_cancel;
1594
1595         switch (option->type) {
1596         case TEAM_OPTION_TYPE_U32:
1597                 if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_U32))
1598                         goto nest_cancel;
1599                 if (nla_put_u32(skb, TEAM_ATTR_OPTION_DATA, ctx.data.u32_val))
1600                         goto nest_cancel;
1601                 break;
1602         case TEAM_OPTION_TYPE_STRING:
1603                 if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_STRING))
1604                         goto nest_cancel;
1605                 if (nla_put_string(skb, TEAM_ATTR_OPTION_DATA,
1606                                    ctx.data.str_val))
1607                         goto nest_cancel;
1608                 break;
1609         case TEAM_OPTION_TYPE_BINARY:
1610                 if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_BINARY))
1611                         goto nest_cancel;
1612                 if (nla_put(skb, TEAM_ATTR_OPTION_DATA, ctx.data.bin_val.len,
1613                             ctx.data.bin_val.ptr))
1614                         goto nest_cancel;
1615                 break;
1616         case TEAM_OPTION_TYPE_BOOL:
1617                 if (nla_put_u8(skb, TEAM_ATTR_OPTION_TYPE, NLA_FLAG))
1618                         goto nest_cancel;
1619                 if (ctx.data.bool_val &&
1620                     nla_put_flag(skb, TEAM_ATTR_OPTION_DATA))
1621                         goto nest_cancel;
1622                 break;
1623         default:
1624                 BUG();
1625         }
1626         if (opt_inst->removed && nla_put_flag(skb, TEAM_ATTR_OPTION_REMOVED))
1627                 goto nest_cancel;
1628         if (opt_inst->changed) {
1629                 if (nla_put_flag(skb, TEAM_ATTR_OPTION_CHANGED))
1630                         goto nest_cancel;
1631                 opt_inst->changed = false;
1632         }
1633         nla_nest_end(skb, option_item);
1634         return 0;
1635
1636 nest_cancel:
1637         nla_nest_cancel(skb, option_item);
1638         return -EMSGSIZE;
1639 }
1640
1641 static int __send_and_alloc_skb(struct sk_buff **pskb,
1642                                 struct team *team, u32 pid,
1643                                 team_nl_send_func_t *send_func)
1644 {
1645         int err;
1646
1647         if (*pskb) {
1648                 err = send_func(*pskb, team, pid);
1649                 if (err)
1650                         return err;
1651         }
1652         *pskb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
1653         if (!*pskb)
1654                 return -ENOMEM;
1655         return 0;
1656 }
1657
1658 static int team_nl_send_options_get(struct team *team, u32 pid, u32 seq,
1659                                     int flags, team_nl_send_func_t *send_func,
1660                                     struct list_head *sel_opt_inst_list)
1661 {
1662         struct nlattr *option_list;
1663         struct nlmsghdr *nlh;
1664         void *hdr;
1665         struct team_option_inst *opt_inst;
1666         int err;
1667         struct sk_buff *skb = NULL;
1668         bool incomplete;
1669         int i;
1670
1671         opt_inst = list_first_entry(sel_opt_inst_list,
1672                                     struct team_option_inst, tmp_list);
1673
1674 start_again:
1675         err = __send_and_alloc_skb(&skb, team, pid, send_func);
1676         if (err)
1677                 return err;
1678
1679         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags | NLM_F_MULTI,
1680                           TEAM_CMD_OPTIONS_GET);
1681         if (IS_ERR(hdr))
1682                 return PTR_ERR(hdr);
1683
1684         if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
1685                 goto nla_put_failure;
1686         option_list = nla_nest_start(skb, TEAM_ATTR_LIST_OPTION);
1687         if (!option_list)
1688                 goto nla_put_failure;
1689
1690         i = 0;
1691         incomplete = false;
1692         list_for_each_entry_from(opt_inst, sel_opt_inst_list, tmp_list) {
1693                 err = team_nl_fill_one_option_get(skb, team, opt_inst);
1694                 if (err) {
1695                         if (err == -EMSGSIZE) {
1696                                 if (!i)
1697                                         goto errout;
1698                                 incomplete = true;
1699                                 break;
1700                         }
1701                         goto errout;
1702                 }
1703                 i++;
1704         }
1705
1706         nla_nest_end(skb, option_list);
1707         genlmsg_end(skb, hdr);
1708         if (incomplete)
1709                 goto start_again;
1710
1711 send_done:
1712         nlh = nlmsg_put(skb, pid, seq, NLMSG_DONE, 0, flags | NLM_F_MULTI);
1713         if (!nlh) {
1714                 err = __send_and_alloc_skb(&skb, team, pid, send_func);
1715                 if (err)
1716                         goto errout;
1717                 goto send_done;
1718         }
1719
1720         return send_func(skb, team, pid);
1721
1722 nla_put_failure:
1723         err = -EMSGSIZE;
1724 errout:
1725         genlmsg_cancel(skb, hdr);
1726         nlmsg_free(skb);
1727         return err;
1728 }
1729
1730 static int team_nl_cmd_options_get(struct sk_buff *skb, struct genl_info *info)
1731 {
1732         struct team *team;
1733         struct team_option_inst *opt_inst;
1734         int err;
1735         LIST_HEAD(sel_opt_inst_list);
1736
1737         team = team_nl_team_get(info);
1738         if (!team)
1739                 return -EINVAL;
1740
1741         list_for_each_entry(opt_inst, &team->option_inst_list, list)
1742                 list_add_tail(&opt_inst->tmp_list, &sel_opt_inst_list);
1743         err = team_nl_send_options_get(team, info->snd_pid, info->snd_seq,
1744                                        NLM_F_ACK, team_nl_send_unicast,
1745                                        &sel_opt_inst_list);
1746
1747         team_nl_team_put(team);
1748
1749         return err;
1750 }
1751
1752 static int team_nl_send_event_options_get(struct team *team,
1753                                           struct list_head *sel_opt_inst_list);
1754
1755 static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
1756 {
1757         struct team *team;
1758         int err = 0;
1759         int i;
1760         struct nlattr *nl_option;
1761         LIST_HEAD(opt_inst_list);
1762
1763         team = team_nl_team_get(info);
1764         if (!team)
1765                 return -EINVAL;
1766
1767         err = -EINVAL;
1768         if (!info->attrs[TEAM_ATTR_LIST_OPTION]) {
1769                 err = -EINVAL;
1770                 goto team_put;
1771         }
1772
1773         nla_for_each_nested(nl_option, info->attrs[TEAM_ATTR_LIST_OPTION], i) {
1774                 struct nlattr *opt_attrs[TEAM_ATTR_OPTION_MAX + 1];
1775                 struct nlattr *attr;
1776                 struct nlattr *attr_data;
1777                 enum team_option_type opt_type;
1778                 int opt_port_ifindex = 0; /* != 0 for per-port options */
1779                 u32 opt_array_index = 0;
1780                 bool opt_is_array = false;
1781                 struct team_option_inst *opt_inst;
1782                 char *opt_name;
1783                 bool opt_found = false;
1784
1785                 if (nla_type(nl_option) != TEAM_ATTR_ITEM_OPTION) {
1786                         err = -EINVAL;
1787                         goto team_put;
1788                 }
1789                 err = nla_parse_nested(opt_attrs, TEAM_ATTR_OPTION_MAX,
1790                                        nl_option, team_nl_option_policy);
1791                 if (err)
1792                         goto team_put;
1793                 if (!opt_attrs[TEAM_ATTR_OPTION_NAME] ||
1794                     !opt_attrs[TEAM_ATTR_OPTION_TYPE]) {
1795                         err = -EINVAL;
1796                         goto team_put;
1797                 }
1798                 switch (nla_get_u8(opt_attrs[TEAM_ATTR_OPTION_TYPE])) {
1799                 case NLA_U32:
1800                         opt_type = TEAM_OPTION_TYPE_U32;
1801                         break;
1802                 case NLA_STRING:
1803                         opt_type = TEAM_OPTION_TYPE_STRING;
1804                         break;
1805                 case NLA_BINARY:
1806                         opt_type = TEAM_OPTION_TYPE_BINARY;
1807                         break;
1808                 case NLA_FLAG:
1809                         opt_type = TEAM_OPTION_TYPE_BOOL;
1810                         break;
1811                 default:
1812                         goto team_put;
1813                 }
1814
1815                 attr_data = opt_attrs[TEAM_ATTR_OPTION_DATA];
1816                 if (opt_type != TEAM_OPTION_TYPE_BOOL && !attr_data) {
1817                         err = -EINVAL;
1818                         goto team_put;
1819                 }
1820
1821                 opt_name = nla_data(opt_attrs[TEAM_ATTR_OPTION_NAME]);
1822                 attr = opt_attrs[TEAM_ATTR_OPTION_PORT_IFINDEX];
1823                 if (attr)
1824                         opt_port_ifindex = nla_get_u32(attr);
1825
1826                 attr = opt_attrs[TEAM_ATTR_OPTION_ARRAY_INDEX];
1827                 if (attr) {
1828                         opt_is_array = true;
1829                         opt_array_index = nla_get_u32(attr);
1830                 }
1831
1832                 list_for_each_entry(opt_inst, &team->option_inst_list, list) {
1833                         struct team_option *option = opt_inst->option;
1834                         struct team_gsetter_ctx ctx;
1835                         struct team_option_inst_info *opt_inst_info;
1836                         int tmp_ifindex;
1837
1838                         opt_inst_info = &opt_inst->info;
1839                         tmp_ifindex = opt_inst_info->port ?
1840                                       opt_inst_info->port->dev->ifindex : 0;
1841                         if (option->type != opt_type ||
1842                             strcmp(option->name, opt_name) ||
1843                             tmp_ifindex != opt_port_ifindex ||
1844                             (option->array_size && !opt_is_array) ||
1845                             opt_inst_info->array_index != opt_array_index)
1846                                 continue;
1847                         opt_found = true;
1848                         ctx.info = opt_inst_info;
1849                         switch (opt_type) {
1850                         case TEAM_OPTION_TYPE_U32:
1851                                 ctx.data.u32_val = nla_get_u32(attr_data);
1852                                 break;
1853                         case TEAM_OPTION_TYPE_STRING:
1854                                 if (nla_len(attr_data) > TEAM_STRING_MAX_LEN) {
1855                                         err = -EINVAL;
1856                                         goto team_put;
1857                                 }
1858                                 ctx.data.str_val = nla_data(attr_data);
1859                                 break;
1860                         case TEAM_OPTION_TYPE_BINARY:
1861                                 ctx.data.bin_val.len = nla_len(attr_data);
1862                                 ctx.data.bin_val.ptr = nla_data(attr_data);
1863                                 break;
1864                         case TEAM_OPTION_TYPE_BOOL:
1865                                 ctx.data.bool_val = attr_data ? true : false;
1866                                 break;
1867                         default:
1868                                 BUG();
1869                         }
1870                         err = team_option_set(team, opt_inst, &ctx);
1871                         if (err)
1872                                 goto team_put;
1873                         opt_inst->changed = true;
1874                         list_add(&opt_inst->tmp_list, &opt_inst_list);
1875                 }
1876                 if (!opt_found) {
1877                         err = -ENOENT;
1878                         goto team_put;
1879                 }
1880         }
1881
1882         err = team_nl_send_event_options_get(team, &opt_inst_list);
1883
1884 team_put:
1885         team_nl_team_put(team);
1886
1887         return err;
1888 }
1889
1890 static int team_nl_fill_port_list_get(struct sk_buff *skb,
1891                                       u32 pid, u32 seq, int flags,
1892                                       struct team *team,
1893                                       bool fillall)
1894 {
1895         struct nlattr *port_list;
1896         void *hdr;
1897         struct team_port *port;
1898
1899         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags,
1900                           TEAM_CMD_PORT_LIST_GET);
1901         if (IS_ERR(hdr))
1902                 return PTR_ERR(hdr);
1903
1904         if (nla_put_u32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex))
1905                 goto nla_put_failure;
1906         port_list = nla_nest_start(skb, TEAM_ATTR_LIST_PORT);
1907         if (!port_list)
1908                 goto nla_put_failure;
1909
1910         list_for_each_entry(port, &team->port_list, list) {
1911                 struct nlattr *port_item;
1912
1913                 /* Include only changed ports if fill all mode is not on */
1914                 if (!fillall && !port->changed)
1915                         continue;
1916                 port_item = nla_nest_start(skb, TEAM_ATTR_ITEM_PORT);
1917                 if (!port_item)
1918                         goto nla_put_failure;
1919                 if (nla_put_u32(skb, TEAM_ATTR_PORT_IFINDEX, port->dev->ifindex))
1920                         goto nla_put_failure;
1921                 if (port->changed) {
1922                         if (nla_put_flag(skb, TEAM_ATTR_PORT_CHANGED))
1923                                 goto nla_put_failure;
1924                         port->changed = false;
1925                 }
1926                 if ((port->removed &&
1927                      nla_put_flag(skb, TEAM_ATTR_PORT_REMOVED)) ||
1928                     (port->state.linkup &&
1929                      nla_put_flag(skb, TEAM_ATTR_PORT_LINKUP)) ||
1930                     nla_put_u32(skb, TEAM_ATTR_PORT_SPEED, port->state.speed) ||
1931                     nla_put_u8(skb, TEAM_ATTR_PORT_DUPLEX, port->state.duplex))
1932                         goto nla_put_failure;
1933                 nla_nest_end(skb, port_item);
1934         }
1935
1936         nla_nest_end(skb, port_list);
1937         return genlmsg_end(skb, hdr);
1938
1939 nla_put_failure:
1940         genlmsg_cancel(skb, hdr);
1941         return -EMSGSIZE;
1942 }
1943
1944 static int team_nl_fill_port_list_get_all(struct sk_buff *skb,
1945                                           struct genl_info *info, int flags,
1946                                           struct team *team)
1947 {
1948         return team_nl_fill_port_list_get(skb, info->snd_pid,
1949                                           info->snd_seq, NLM_F_ACK,
1950                                           team, true);
1951 }
1952
1953 static int team_nl_cmd_port_list_get(struct sk_buff *skb,
1954                                      struct genl_info *info)
1955 {
1956         struct team *team;
1957         int err;
1958
1959         team = team_nl_team_get(info);
1960         if (!team)
1961                 return -EINVAL;
1962
1963         err = team_nl_send_generic(info, team, team_nl_fill_port_list_get_all);
1964
1965         team_nl_team_put(team);
1966
1967         return err;
1968 }
1969
1970 static struct genl_ops team_nl_ops[] = {
1971         {
1972                 .cmd = TEAM_CMD_NOOP,
1973                 .doit = team_nl_cmd_noop,
1974                 .policy = team_nl_policy,
1975         },
1976         {
1977                 .cmd = TEAM_CMD_OPTIONS_SET,
1978                 .doit = team_nl_cmd_options_set,
1979                 .policy = team_nl_policy,
1980                 .flags = GENL_ADMIN_PERM,
1981         },
1982         {
1983                 .cmd = TEAM_CMD_OPTIONS_GET,
1984                 .doit = team_nl_cmd_options_get,
1985                 .policy = team_nl_policy,
1986                 .flags = GENL_ADMIN_PERM,
1987         },
1988         {
1989                 .cmd = TEAM_CMD_PORT_LIST_GET,
1990                 .doit = team_nl_cmd_port_list_get,
1991                 .policy = team_nl_policy,
1992                 .flags = GENL_ADMIN_PERM,
1993         },
1994 };
1995
1996 static struct genl_multicast_group team_change_event_mcgrp = {
1997         .name = TEAM_GENL_CHANGE_EVENT_MC_GRP_NAME,
1998 };
1999
2000 static int team_nl_send_multicast(struct sk_buff *skb,
2001                                   struct team *team, u32 pid)
2002 {
2003         return genlmsg_multicast_netns(dev_net(team->dev), skb, 0,
2004                                        team_change_event_mcgrp.id, GFP_KERNEL);
2005 }
2006
2007 static int team_nl_send_event_options_get(struct team *team,
2008                                           struct list_head *sel_opt_inst_list)
2009 {
2010         return team_nl_send_options_get(team, 0, 0, 0, team_nl_send_multicast,
2011                                         sel_opt_inst_list);
2012 }
2013
2014 static int team_nl_send_event_port_list_get(struct team *team)
2015 {
2016         struct sk_buff *skb;
2017         int err;
2018         struct net *net = dev_net(team->dev);
2019
2020         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2021         if (!skb)
2022                 return -ENOMEM;
2023
2024         err = team_nl_fill_port_list_get(skb, 0, 0, 0, team, false);
2025         if (err < 0)
2026                 goto err_fill;
2027
2028         err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id,
2029                                       GFP_KERNEL);
2030         return err;
2031
2032 err_fill:
2033         nlmsg_free(skb);
2034         return err;
2035 }
2036
2037 static int team_nl_init(void)
2038 {
2039         int err;
2040
2041         err = genl_register_family_with_ops(&team_nl_family, team_nl_ops,
2042                                             ARRAY_SIZE(team_nl_ops));
2043         if (err)
2044                 return err;
2045
2046         err = genl_register_mc_group(&team_nl_family, &team_change_event_mcgrp);
2047         if (err)
2048                 goto err_change_event_grp_reg;
2049
2050         return 0;
2051
2052 err_change_event_grp_reg:
2053         genl_unregister_family(&team_nl_family);
2054
2055         return err;
2056 }
2057
2058 static void team_nl_fini(void)
2059 {
2060         genl_unregister_family(&team_nl_family);
2061 }
2062
2063
2064 /******************
2065  * Change checkers
2066  ******************/
2067
2068 static void __team_options_change_check(struct team *team)
2069 {
2070         int err;
2071         struct team_option_inst *opt_inst;
2072         LIST_HEAD(sel_opt_inst_list);
2073
2074         list_for_each_entry(opt_inst, &team->option_inst_list, list) {
2075                 if (opt_inst->changed)
2076                         list_add_tail(&opt_inst->tmp_list, &sel_opt_inst_list);
2077         }
2078         err = team_nl_send_event_options_get(team, &sel_opt_inst_list);
2079         if (err)
2080                 netdev_warn(team->dev, "Failed to send options change via netlink (err %d)\n",
2081                             err);
2082 }
2083
2084 /* rtnl lock is held */
2085 static void __team_port_change_check(struct team_port *port, bool linkup)
2086 {
2087         int err;
2088
2089         if (!port->removed && port->state.linkup == linkup)
2090                 return;
2091
2092         port->changed = true;
2093         port->state.linkup = linkup;
2094         team_refresh_port_linkup(port);
2095         if (linkup) {
2096                 struct ethtool_cmd ecmd;
2097
2098                 err = __ethtool_get_settings(port->dev, &ecmd);
2099                 if (!err) {
2100                         port->state.speed = ethtool_cmd_speed(&ecmd);
2101                         port->state.duplex = ecmd.duplex;
2102                         goto send_event;
2103                 }
2104         }
2105         port->state.speed = 0;
2106         port->state.duplex = 0;
2107
2108 send_event:
2109         err = team_nl_send_event_port_list_get(port->team);
2110         if (err)
2111                 netdev_warn(port->team->dev, "Failed to send port change of device %s via netlink\n",
2112                             port->dev->name);
2113
2114 }
2115
2116 static void team_port_change_check(struct team_port *port, bool linkup)
2117 {
2118         struct team *team = port->team;
2119
2120         mutex_lock(&team->lock);
2121         __team_port_change_check(port, linkup);
2122         mutex_unlock(&team->lock);
2123 }
2124
2125
2126 /************************************
2127  * Net device notifier event handler
2128  ************************************/
2129
2130 static int team_device_event(struct notifier_block *unused,
2131                              unsigned long event, void *ptr)
2132 {
2133         struct net_device *dev = (struct net_device *) ptr;
2134         struct team_port *port;
2135
2136         port = team_port_get_rtnl(dev);
2137         if (!port)
2138                 return NOTIFY_DONE;
2139
2140         switch (event) {
2141         case NETDEV_UP:
2142                 if (netif_carrier_ok(dev))
2143                         team_port_change_check(port, true);
2144         case NETDEV_DOWN:
2145                 team_port_change_check(port, false);
2146         case NETDEV_CHANGE:
2147                 if (netif_running(port->dev))
2148                         team_port_change_check(port,
2149                                                !!netif_carrier_ok(port->dev));
2150                 break;
2151         case NETDEV_UNREGISTER:
2152                 team_del_slave(port->team->dev, dev);
2153                 break;
2154         case NETDEV_FEAT_CHANGE:
2155                 team_compute_features(port->team);
2156                 break;
2157         case NETDEV_CHANGEMTU:
2158                 /* Forbid to change mtu of underlaying device */
2159                 return NOTIFY_BAD;
2160         case NETDEV_PRE_TYPE_CHANGE:
2161                 /* Forbid to change type of underlaying device */
2162                 return NOTIFY_BAD;
2163         }
2164         return NOTIFY_DONE;
2165 }
2166
2167 static struct notifier_block team_notifier_block __read_mostly = {
2168         .notifier_call = team_device_event,
2169 };
2170
2171
2172 /***********************
2173  * Module init and exit
2174  ***********************/
2175
2176 static int __init team_module_init(void)
2177 {
2178         int err;
2179
2180         register_netdevice_notifier(&team_notifier_block);
2181
2182         err = rtnl_link_register(&team_link_ops);
2183         if (err)
2184                 goto err_rtnl_reg;
2185
2186         err = team_nl_init();
2187         if (err)
2188                 goto err_nl_init;
2189
2190         return 0;
2191
2192 err_nl_init:
2193         rtnl_link_unregister(&team_link_ops);
2194
2195 err_rtnl_reg:
2196         unregister_netdevice_notifier(&team_notifier_block);
2197
2198         return err;
2199 }
2200
2201 static void __exit team_module_exit(void)
2202 {
2203         team_nl_fini();
2204         rtnl_link_unregister(&team_link_ops);
2205         unregister_netdevice_notifier(&team_notifier_block);
2206 }
2207
2208 module_init(team_module_init);
2209 module_exit(team_module_exit);
2210
2211 MODULE_LICENSE("GPL v2");
2212 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
2213 MODULE_DESCRIPTION("Ethernet team device driver");
2214 MODULE_ALIAS_RTNL_LINK(DRV_NAME);