drivers/net/team/team.c

   1 /*
   2  * net/drivers/team/team.c - Network team device driver
   3  * Copyright (c) 2011 Jiri Pirko <jpirko@redhat.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/rcupdate.h>
  17 #include <linux/errno.h>
  18 #include <linux/ctype.h>
  19 #include <linux/notifier.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/if_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 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
  80 /*******************
  81  * Options handling
  82  *******************/
  83
  84 struct team_option *__team_find_option(struct team *team, const char *opt_name)
  85 {
  86         struct team_option *option;
  87
  88         list_for_each_entry(option, &team->option_list, list) {
  89                 if (strcmp(option->name, opt_name) == 0)
  90                         return option;
  91         }
  92         return NULL;
  93 }
  94
  95 int __team_options_register(struct team *team,
  96                             const struct team_option *option,
  97                             size_t option_count)
  98 {
  99         int i;
 100         struct team_option **dst_opts;
 101         int err;
 102
 103         dst_opts = kzalloc(sizeof(struct team_option *) * option_count,
 104                            GFP_KERNEL);
 105         if (!dst_opts)
 106                 return -ENOMEM;
 107         for (i = 0; i < option_count; i++, option++) {
 108                 if (__team_find_option(team, option->name)) {
 109                         err = -EEXIST;
 110                         goto rollback;
 111                 }
 112                 dst_opts[i] = kmemdup(option, sizeof(*option), GFP_KERNEL);
 113                 if (!dst_opts[i]) {
 114                         err = -ENOMEM;
 115                         goto rollback;
 116                 }
 117         }
 118
 119         for (i = 0; i < option_count; i++) {
 120                 dst_opts[i]->changed = true;
 121                 dst_opts[i]->removed = false;
 122                 list_add_tail(&dst_opts[i]->list, &team->option_list);
 123         }
 124
 125         kfree(dst_opts);
 126         return 0;
 127
 128 rollback:
 129         for (i = 0; i < option_count; i++)
 130                 kfree(dst_opts[i]);
 131
 132         kfree(dst_opts);
 133         return err;
 134 }
 135
 136 static void __team_options_mark_removed(struct team *team,
 137                                         const struct team_option *option,
 138                                         size_t option_count)
 139 {
 140         int i;
 141
 142         for (i = 0; i < option_count; i++, option++) {
 143                 struct team_option *del_opt;
 144
 145                 del_opt = __team_find_option(team, option->name);
 146                 if (del_opt) {
 147                         del_opt->changed = true;
 148                         del_opt->removed = true;
 149                 }
 150         }
 151 }
 152
 153 static void __team_options_unregister(struct team *team,
 154                                       const struct team_option *option,
 155                                       size_t option_count)
 156 {
 157         int i;
 158
 159         for (i = 0; i < option_count; i++, option++) {
 160                 struct team_option *del_opt;
 161
 162                 del_opt = __team_find_option(team, option->name);
 163                 if (del_opt) {
 164                         list_del(&del_opt->list);
 165                         kfree(del_opt);
 166                 }
 167         }
 168 }
 169
 170 static void __team_options_change_check(struct team *team);
 171
 172 int team_options_register(struct team *team,
 173                           const struct team_option *option,
 174                           size_t option_count)
 175 {
 176         int err;
 177
 178         err = __team_options_register(team, option, option_count);
 179         if (err)
 180                 return err;
 181         __team_options_change_check(team);
 182         return 0;
 183 }
 184 EXPORT_SYMBOL(team_options_register);
 185
 186 void team_options_unregister(struct team *team,
 187                              const struct team_option *option,
 188                              size_t option_count)
 189 {
 190         __team_options_mark_removed(team, option, option_count);
 191         __team_options_change_check(team);
 192         __team_options_unregister(team, option, option_count);
 193 }
 194 EXPORT_SYMBOL(team_options_unregister);
 195
 196 static int team_option_get(struct team *team, struct team_option *option,
 197                            void *arg)
 198 {
 199         return option->getter(team, arg);
 200 }
 201
 202 static int team_option_set(struct team *team, struct team_option *option,
 203                            void *arg)
 204 {
 205         int err;
 206
 207         err = option->setter(team, arg);
 208         if (err)
 209                 return err;
 210
 211         option->changed = true;
 212         __team_options_change_check(team);
 213         return err;
 214 }
 215
 216 /****************
 217  * Mode handling
 218  ****************/
 219
 220 static LIST_HEAD(mode_list);
 221 static DEFINE_SPINLOCK(mode_list_lock);
 222
 223 static struct team_mode *__find_mode(const char *kind)
 224 {
 225         struct team_mode *mode;
 226
 227         list_for_each_entry(mode, &mode_list, list) {
 228                 if (strcmp(mode->kind, kind) == 0)
 229                         return mode;
 230         }
 231         return NULL;
 232 }
 233
 234 static bool is_good_mode_name(const char *name)
 235 {
 236         while (*name != '\0') {
 237                 if (!isalpha(*name) && !isdigit(*name) && *name != '_')
 238                         return false;
 239                 name++;
 240         }
 241         return true;
 242 }
 243
 244 int team_mode_register(struct team_mode *mode)
 245 {
 246         int err = 0;
 247
 248         if (!is_good_mode_name(mode->kind) ||
 249             mode->priv_size > TEAM_MODE_PRIV_SIZE)
 250                 return -EINVAL;
 251         spin_lock(&mode_list_lock);
 252         if (__find_mode(mode->kind)) {
 253                 err = -EEXIST;
 254                 goto unlock;
 255         }
 256         list_add_tail(&mode->list, &mode_list);
 257 unlock:
 258         spin_unlock(&mode_list_lock);
 259         return err;
 260 }
 261 EXPORT_SYMBOL(team_mode_register);
 262
 263 int team_mode_unregister(struct team_mode *mode)
 264 {
 265         spin_lock(&mode_list_lock);
 266         list_del_init(&mode->list);
 267         spin_unlock(&mode_list_lock);
 268         return 0;
 269 }
 270 EXPORT_SYMBOL(team_mode_unregister);
 271
 272 static struct team_mode *team_mode_get(const char *kind)
 273 {
 274         struct team_mode *mode;
 275
 276         spin_lock(&mode_list_lock);
 277         mode = __find_mode(kind);
 278         if (!mode) {
 279                 spin_unlock(&mode_list_lock);
 280                 request_module("team-mode-%s", kind);
 281                 spin_lock(&mode_list_lock);
 282                 mode = __find_mode(kind);
 283         }
 284         if (mode)
 285                 if (!try_module_get(mode->owner))
 286                         mode = NULL;
 287
 288         spin_unlock(&mode_list_lock);
 289         return mode;
 290 }
 291
 292 static void team_mode_put(const struct team_mode *mode)
 293 {
 294         module_put(mode->owner);
 295 }
 296
 297 static bool team_dummy_transmit(struct team *team, struct sk_buff *skb)
 298 {
 299         dev_kfree_skb_any(skb);
 300         return false;
 301 }
 302
 303 rx_handler_result_t team_dummy_receive(struct team *team,
 304                                        struct team_port *port,
 305                                        struct sk_buff *skb)
 306 {
 307         return RX_HANDLER_ANOTHER;
 308 }
 309
 310 static void team_adjust_ops(struct team *team)
 311 {
 312         /*
 313          * To avoid checks in rx/tx skb paths, ensure here that non-null and
 314          * correct ops are always set.
 315          */
 316
 317         if (list_empty(&team->port_list) ||
 318             !team->mode || !team->mode->ops->transmit)
 319                 team->ops.transmit = team_dummy_transmit;
 320         else
 321                 team->ops.transmit = team->mode->ops->transmit;
 322
 323         if (list_empty(&team->port_list) ||
 324             !team->mode || !team->mode->ops->receive)
 325                 team->ops.receive = team_dummy_receive;
 326         else
 327                 team->ops.receive = team->mode->ops->receive;
 328 }
 329
 330 /*
 331  * We can benefit from the fact that it's ensured no port is present
 332  * at the time of mode change. Therefore no packets are in fly so there's no
 333  * need to set mode operations in any special way.
 334  */
 335 static int __team_change_mode(struct team *team,
 336                               const struct team_mode *new_mode)
 337 {
 338         /* Check if mode was previously set and do cleanup if so */
 339         if (team->mode) {
 340                 void (*exit_op)(struct team *team) = team->ops.exit;
 341
 342                 /* Clear ops area so no callback is called any longer */
 343                 memset(&team->ops, 0, sizeof(struct team_mode_ops));
 344                 team_adjust_ops(team);
 345
 346                 if (exit_op)
 347                         exit_op(team);
 348                 team_mode_put(team->mode);
 349                 team->mode = NULL;
 350                 /* zero private data area */
 351                 memset(&team->mode_priv, 0,
 352                        sizeof(struct team) - offsetof(struct team, mode_priv));
 353         }
 354
 355         if (!new_mode)
 356                 return 0;
 357
 358         if (new_mode->ops->init) {
 359                 int err;
 360
 361                 err = new_mode->ops->init(team);
 362                 if (err)
 363                         return err;
 364         }
 365
 366         team->mode = new_mode;
 367         memcpy(&team->ops, new_mode->ops, sizeof(struct team_mode_ops));
 368         team_adjust_ops(team);
 369
 370         return 0;
 371 }
 372
 373 static int team_change_mode(struct team *team, const char *kind)
 374 {
 375         struct team_mode *new_mode;
 376         struct net_device *dev = team->dev;
 377         int err;
 378
 379         if (!list_empty(&team->port_list)) {
 380                 netdev_err(dev, "No ports can be present during mode change\n");
 381                 return -EBUSY;
 382         }
 383
 384         if (team->mode && strcmp(team->mode->kind, kind) == 0) {
 385                 netdev_err(dev, "Unable to change to the same mode the team is in\n");
 386                 return -EINVAL;
 387         }
 388
 389         new_mode = team_mode_get(kind);
 390         if (!new_mode) {
 391                 netdev_err(dev, "Mode \"%s\" not found\n", kind);
 392                 return -EINVAL;
 393         }
 394
 395         err = __team_change_mode(team, new_mode);
 396         if (err) {
 397                 netdev_err(dev, "Failed to change to mode \"%s\"\n", kind);
 398                 team_mode_put(new_mode);
 399                 return err;
 400         }
 401
 402         netdev_info(dev, "Mode changed to \"%s\"\n", kind);
 403         return 0;
 404 }
 405
 406
 407 /************************
 408  * Rx path frame handler
 409  ************************/
 410
 411 /* note: already called with rcu_read_lock */
 412 static rx_handler_result_t team_handle_frame(struct sk_buff **pskb)
 413 {
 414         struct sk_buff *skb = *pskb;
 415         struct team_port *port;
 416         struct team *team;
 417         rx_handler_result_t res;
 418
 419         skb = skb_share_check(skb, GFP_ATOMIC);
 420         if (!skb)
 421                 return RX_HANDLER_CONSUMED;
 422
 423         *pskb = skb;
 424
 425         port = team_port_get_rcu(skb->dev);
 426         team = port->team;
 427
 428         res = team->ops.receive(team, port, skb);
 429         if (res == RX_HANDLER_ANOTHER) {
 430                 struct team_pcpu_stats *pcpu_stats;
 431
 432                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
 433                 u64_stats_update_begin(&pcpu_stats->syncp);
 434                 pcpu_stats->rx_packets++;
 435                 pcpu_stats->rx_bytes += skb->len;
 436                 if (skb->pkt_type == PACKET_MULTICAST)
 437                         pcpu_stats->rx_multicast++;
 438                 u64_stats_update_end(&pcpu_stats->syncp);
 439
 440                 skb->dev = team->dev;
 441         } else {
 442                 this_cpu_inc(team->pcpu_stats->rx_dropped);
 443         }
 444
 445         return res;
 446 }
 447
 448
 449 /****************
 450  * Port handling
 451  ****************/
 452
 453 static bool team_port_find(const struct team *team,
 454                            const struct team_port *port)
 455 {
 456         struct team_port *cur;
 457
 458         list_for_each_entry(cur, &team->port_list, list)
 459                 if (cur == port)
 460                         return true;
 461         return false;
 462 }
 463
 464 /*
 465  * Add/delete port to the team port list. Write guarded by rtnl_lock.
 466  * Takes care of correct port->index setup (might be racy).
 467  */
 468 static void team_port_list_add_port(struct team *team,
 469                                     struct team_port *port)
 470 {
 471         port->index = team->port_count++;
 472         hlist_add_head_rcu(&port->hlist,
 473                            team_port_index_hash(team, port->index));
 474         list_add_tail_rcu(&port->list, &team->port_list);
 475 }
 476
 477 static void __reconstruct_port_hlist(struct team *team, int rm_index)
 478 {
 479         int i;
 480         struct team_port *port;
 481
 482         for (i = rm_index + 1; i < team->port_count; i++) {
 483                 port = team_get_port_by_index(team, i);
 484                 hlist_del_rcu(&port->hlist);
 485                 port->index--;
 486                 hlist_add_head_rcu(&port->hlist,
 487                                    team_port_index_hash(team, port->index));
 488         }
 489 }
 490
 491 static void team_port_list_del_port(struct team *team,
 492                                    struct team_port *port)
 493 {
 494         int rm_index = port->index;
 495
 496         hlist_del_rcu(&port->hlist);
 497         list_del_rcu(&port->list);
 498         __reconstruct_port_hlist(team, rm_index);
 499         team->port_count--;
 500 }
 501
 502 #define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \
 503                             NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \
 504                             NETIF_F_HIGHDMA | NETIF_F_LRO)
 505
 506 static void __team_compute_features(struct team *team)
 507 {
 508         struct team_port *port;
 509         u32 vlan_features = TEAM_VLAN_FEATURES;
 510         unsigned short max_hard_header_len = ETH_HLEN;
 511
 512         list_for_each_entry(port, &team->port_list, list) {
 513                 vlan_features = netdev_increment_features(vlan_features,
 514                                         port->dev->vlan_features,
 515                                         TEAM_VLAN_FEATURES);
 516
 517                 if (port->dev->hard_header_len > max_hard_header_len)
 518                         max_hard_header_len = port->dev->hard_header_len;
 519         }
 520
 521         team->dev->vlan_features = vlan_features;
 522         team->dev->hard_header_len = max_hard_header_len;
 523
 524         netdev_change_features(team->dev);
 525 }
 526
 527 static void team_compute_features(struct team *team)
 528 {
 529         mutex_lock(&team->lock);
 530         __team_compute_features(team);
 531         mutex_unlock(&team->lock);
 532 }
 533
 534 static int team_port_enter(struct team *team, struct team_port *port)
 535 {
 536         int err = 0;
 537
 538         dev_hold(team->dev);
 539         port->dev->priv_flags |= IFF_TEAM_PORT;
 540         if (team->ops.port_enter) {
 541                 err = team->ops.port_enter(team, port);
 542                 if (err) {
 543                         netdev_err(team->dev, "Device %s failed to enter team mode\n",
 544                                    port->dev->name);
 545                         goto err_port_enter;
 546                 }
 547         }
 548
 549         return 0;
 550
 551 err_port_enter:
 552         port->dev->priv_flags &= ~IFF_TEAM_PORT;
 553         dev_put(team->dev);
 554
 555         return err;
 556 }
 557
 558 static void team_port_leave(struct team *team, struct team_port *port)
 559 {
 560         if (team->ops.port_leave)
 561                 team->ops.port_leave(team, port);
 562         port->dev->priv_flags &= ~IFF_TEAM_PORT;
 563         dev_put(team->dev);
 564 }
 565
 566 static void __team_port_change_check(struct team_port *port, bool linkup);
 567
 568 static int team_port_add(struct team *team, struct net_device *port_dev)
 569 {
 570         struct net_device *dev = team->dev;
 571         struct team_port *port;
 572         char *portname = port_dev->name;
 573         int err;
 574
 575         if (port_dev->flags & IFF_LOOPBACK ||
 576             port_dev->type != ARPHRD_ETHER) {
 577                 netdev_err(dev, "Device %s is of an unsupported type\n",
 578                            portname);
 579                 return -EINVAL;
 580         }
 581
 582         if (team_port_exists(port_dev)) {
 583                 netdev_err(dev, "Device %s is already a port "
 584                                 "of a team device\n", portname);
 585                 return -EBUSY;
 586         }
 587
 588         if (port_dev->flags & IFF_UP) {
 589                 netdev_err(dev, "Device %s is up. Set it down before adding it as a team port\n",
 590                            portname);
 591                 return -EBUSY;
 592         }
 593
 594         port = kzalloc(sizeof(struct team_port), GFP_KERNEL);
 595         if (!port)
 596                 return -ENOMEM;
 597
 598         port->dev = port_dev;
 599         port->team = team;
 600
 601         port->orig.mtu = port_dev->mtu;
 602         err = dev_set_mtu(port_dev, dev->mtu);
 603         if (err) {
 604                 netdev_dbg(dev, "Error %d calling dev_set_mtu\n", err);
 605                 goto err_set_mtu;
 606         }
 607
 608         memcpy(port->orig.dev_addr, port_dev->dev_addr, ETH_ALEN);
 609
 610         err = team_port_enter(team, port);
 611         if (err) {
 612                 netdev_err(dev, "Device %s failed to enter team mode\n",
 613                            portname);
 614                 goto err_port_enter;
 615         }
 616
 617         err = dev_open(port_dev);
 618         if (err) {
 619                 netdev_dbg(dev, "Device %s opening failed\n",
 620                            portname);
 621                 goto err_dev_open;
 622         }
 623
 624         err = vlan_vids_add_by_dev(port_dev, dev);
 625         if (err) {
 626                 netdev_err(dev, "Failed to add vlan ids to device %s\n",
 627                                 portname);
 628                 goto err_vids_add;
 629         }
 630
 631         err = netdev_set_master(port_dev, dev);
 632         if (err) {
 633                 netdev_err(dev, "Device %s failed to set master\n", portname);
 634                 goto err_set_master;
 635         }
 636
 637         err = netdev_rx_handler_register(port_dev, team_handle_frame,
 638                                          port);
 639         if (err) {
 640                 netdev_err(dev, "Device %s failed to register rx_handler\n",
 641                            portname);
 642                 goto err_handler_register;
 643         }
 644
 645         team_port_list_add_port(team, port);
 646         team_adjust_ops(team);
 647         __team_compute_features(team);
 648         __team_port_change_check(port, !!netif_carrier_ok(port_dev));
 649
 650         netdev_info(dev, "Port device %s added\n", portname);
 651
 652         return 0;
 653
 654 err_handler_register:
 655         netdev_set_master(port_dev, NULL);
 656
 657 err_set_master:
 658         vlan_vids_del_by_dev(port_dev, dev);
 659
 660 err_vids_add:
 661         dev_close(port_dev);
 662
 663 err_dev_open:
 664         team_port_leave(team, port);
 665         team_port_set_orig_mac(port);
 666
 667 err_port_enter:
 668         dev_set_mtu(port_dev, port->orig.mtu);
 669
 670 err_set_mtu:
 671         kfree(port);
 672
 673         return err;
 674 }
 675
 676 static int team_port_del(struct team *team, struct net_device *port_dev)
 677 {
 678         struct net_device *dev = team->dev;
 679         struct team_port *port;
 680         char *portname = port_dev->name;
 681
 682         port = team_port_get_rtnl(port_dev);
 683         if (!port || !team_port_find(team, port)) {
 684                 netdev_err(dev, "Device %s does not act as a port of this team\n",
 685                            portname);
 686                 return -ENOENT;
 687         }
 688
 689         port->removed = true;
 690         __team_port_change_check(port, false);
 691         team_port_list_del_port(team, port);
 692         team_adjust_ops(team);
 693         netdev_rx_handler_unregister(port_dev);
 694         netdev_set_master(port_dev, NULL);
 695         vlan_vids_del_by_dev(port_dev, dev);
 696         dev_close(port_dev);
 697         team_port_leave(team, port);
 698         team_port_set_orig_mac(port);
 699         dev_set_mtu(port_dev, port->orig.mtu);
 700         synchronize_rcu();
 701         kfree(port);
 702         netdev_info(dev, "Port device %s removed\n", portname);
 703         __team_compute_features(team);
 704
 705         return 0;
 706 }
 707
 708
 709 /*****************
 710  * Net device ops
 711  *****************/
 712
 713 static const char team_no_mode_kind[] = "*NOMODE*";
 714
 715 static int team_mode_option_get(struct team *team, void *arg)
 716 {
 717         const char **str = arg;
 718
 719         *str = team->mode ? team->mode->kind : team_no_mode_kind;
 720         return 0;
 721 }
 722
 723 static int team_mode_option_set(struct team *team, void *arg)
 724 {
 725         const char **str = arg;
 726
 727         return team_change_mode(team, *str);
 728 }
 729
 730 static const struct team_option team_options[] = {
 731         {
 732                 .name = "mode",
 733                 .type = TEAM_OPTION_TYPE_STRING,
 734                 .getter = team_mode_option_get,
 735                 .setter = team_mode_option_set,
 736         },
 737 };
 738
 739 static int team_init(struct net_device *dev)
 740 {
 741         struct team *team = netdev_priv(dev);
 742         int i;
 743         int err;
 744
 745         team->dev = dev;
 746         mutex_init(&team->lock);
 747
 748         team->pcpu_stats = alloc_percpu(struct team_pcpu_stats);
 749         if (!team->pcpu_stats)
 750                 return -ENOMEM;
 751
 752         for (i = 0; i < TEAM_PORT_HASHENTRIES; i++)
 753                 INIT_HLIST_HEAD(&team->port_hlist[i]);
 754         INIT_LIST_HEAD(&team->port_list);
 755
 756         team_adjust_ops(team);
 757
 758         INIT_LIST_HEAD(&team->option_list);
 759         err = team_options_register(team, team_options, ARRAY_SIZE(team_options));
 760         if (err)
 761                 goto err_options_register;
 762         netif_carrier_off(dev);
 763
 764         return 0;
 765
 766 err_options_register:
 767         free_percpu(team->pcpu_stats);
 768
 769         return err;
 770 }
 771
 772 static void team_uninit(struct net_device *dev)
 773 {
 774         struct team *team = netdev_priv(dev);
 775         struct team_port *port;
 776         struct team_port *tmp;
 777
 778         mutex_lock(&team->lock);
 779         list_for_each_entry_safe(port, tmp, &team->port_list, list)
 780                 team_port_del(team, port->dev);
 781
 782         __team_change_mode(team, NULL); /* cleanup */
 783         __team_options_unregister(team, team_options, ARRAY_SIZE(team_options));
 784         mutex_unlock(&team->lock);
 785 }
 786
 787 static void team_destructor(struct net_device *dev)
 788 {
 789         struct team *team = netdev_priv(dev);
 790
 791         free_percpu(team->pcpu_stats);
 792         free_netdev(dev);
 793 }
 794
 795 static int team_open(struct net_device *dev)
 796 {
 797         netif_carrier_on(dev);
 798         return 0;
 799 }
 800
 801 static int team_close(struct net_device *dev)
 802 {
 803         netif_carrier_off(dev);
 804         return 0;
 805 }
 806
 807 /*
 808  * note: already called with rcu_read_lock
 809  */
 810 static netdev_tx_t team_xmit(struct sk_buff *skb, struct net_device *dev)
 811 {
 812         struct team *team = netdev_priv(dev);
 813         bool tx_success = false;
 814         unsigned int len = skb->len;
 815
 816         tx_success = team->ops.transmit(team, skb);
 817         if (tx_success) {
 818                 struct team_pcpu_stats *pcpu_stats;
 819
 820                 pcpu_stats = this_cpu_ptr(team->pcpu_stats);
 821                 u64_stats_update_begin(&pcpu_stats->syncp);
 822                 pcpu_stats->tx_packets++;
 823                 pcpu_stats->tx_bytes += len;
 824                 u64_stats_update_end(&pcpu_stats->syncp);
 825         } else {
 826                 this_cpu_inc(team->pcpu_stats->tx_dropped);
 827         }
 828
 829         return NETDEV_TX_OK;
 830 }
 831
 832 static void team_change_rx_flags(struct net_device *dev, int change)
 833 {
 834         struct team *team = netdev_priv(dev);
 835         struct team_port *port;
 836         int inc;
 837
 838         rcu_read_lock();
 839         list_for_each_entry_rcu(port, &team->port_list, list) {
 840                 if (change & IFF_PROMISC) {
 841                         inc = dev->flags & IFF_PROMISC ? 1 : -1;
 842                         dev_set_promiscuity(port->dev, inc);
 843                 }
 844                 if (change & IFF_ALLMULTI) {
 845                         inc = dev->flags & IFF_ALLMULTI ? 1 : -1;
 846                         dev_set_allmulti(port->dev, inc);
 847                 }
 848         }
 849         rcu_read_unlock();
 850 }
 851
 852 static void team_set_rx_mode(struct net_device *dev)
 853 {
 854         struct team *team = netdev_priv(dev);
 855         struct team_port *port;
 856
 857         rcu_read_lock();
 858         list_for_each_entry_rcu(port, &team->port_list, list) {
 859                 dev_uc_sync(port->dev, dev);
 860                 dev_mc_sync(port->dev, dev);
 861         }
 862         rcu_read_unlock();
 863 }
 864
 865 static int team_set_mac_address(struct net_device *dev, void *p)
 866 {
 867         struct team *team = netdev_priv(dev);
 868         struct team_port *port;
 869         struct sockaddr *addr = p;
 870
 871         memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
 872         rcu_read_lock();
 873         list_for_each_entry_rcu(port, &team->port_list, list)
 874                 if (team->ops.port_change_mac)
 875                         team->ops.port_change_mac(team, port);
 876         rcu_read_unlock();
 877         return 0;
 878 }
 879
 880 static int team_change_mtu(struct net_device *dev, int new_mtu)
 881 {
 882         struct team *team = netdev_priv(dev);
 883         struct team_port *port;
 884         int err;
 885
 886         /*
 887          * Alhough this is reader, it's guarded by team lock. It's not possible
 888          * to traverse list in reverse under rcu_read_lock
 889          */
 890         mutex_lock(&team->lock);
 891         list_for_each_entry(port, &team->port_list, list) {
 892                 err = dev_set_mtu(port->dev, new_mtu);
 893                 if (err) {
 894                         netdev_err(dev, "Device %s failed to change mtu",
 895                                    port->dev->name);
 896                         goto unwind;
 897                 }
 898         }
 899         mutex_unlock(&team->lock);
 900
 901         dev->mtu = new_mtu;
 902
 903         return 0;
 904
 905 unwind:
 906         list_for_each_entry_continue_reverse(port, &team->port_list, list)
 907                 dev_set_mtu(port->dev, dev->mtu);
 908         mutex_unlock(&team->lock);
 909
 910         return err;
 911 }
 912
 913 static struct rtnl_link_stats64 *
 914 team_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 915 {
 916         struct team *team = netdev_priv(dev);
 917         struct team_pcpu_stats *p;
 918         u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
 919         u32 rx_dropped = 0, tx_dropped = 0;
 920         unsigned int start;
 921         int i;
 922
 923         for_each_possible_cpu(i) {
 924                 p = per_cpu_ptr(team->pcpu_stats, i);
 925                 do {
 926                         start = u64_stats_fetch_begin_bh(&p->syncp);
 927                         rx_packets      = p->rx_packets;
 928                         rx_bytes        = p->rx_bytes;
 929                         rx_multicast    = p->rx_multicast;
 930                         tx_packets      = p->tx_packets;
 931                         tx_bytes        = p->tx_bytes;
 932                 } while (u64_stats_fetch_retry_bh(&p->syncp, start));
 933
 934                 stats->rx_packets       += rx_packets;
 935                 stats->rx_bytes         += rx_bytes;
 936                 stats->multicast        += rx_multicast;
 937                 stats->tx_packets       += tx_packets;
 938                 stats->tx_bytes         += tx_bytes;
 939                 /*
 940                  * rx_dropped & tx_dropped are u32, updated
 941                  * without syncp protection.
 942                  */
 943                 rx_dropped      += p->rx_dropped;
 944                 tx_dropped      += p->tx_dropped;
 945         }
 946         stats->rx_dropped       = rx_dropped;
 947         stats->tx_dropped       = tx_dropped;
 948         return stats;
 949 }
 950
 951 static int team_vlan_rx_add_vid(struct net_device *dev, uint16_t vid)
 952 {
 953         struct team *team = netdev_priv(dev);
 954         struct team_port *port;
 955         int err;
 956
 957         /*
 958          * Alhough this is reader, it's guarded by team lock. It's not possible
 959          * to traverse list in reverse under rcu_read_lock
 960          */
 961         mutex_lock(&team->lock);
 962         list_for_each_entry(port, &team->port_list, list) {
 963                 err = vlan_vid_add(port->dev, vid);
 964                 if (err)
 965                         goto unwind;
 966         }
 967         mutex_unlock(&team->lock);
 968
 969         return 0;
 970
 971 unwind:
 972         list_for_each_entry_continue_reverse(port, &team->port_list, list)
 973                 vlan_vid_del(port->dev, vid);
 974         mutex_unlock(&team->lock);
 975
 976         return err;
 977 }
 978
 979 static int team_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid)
 980 {
 981         struct team *team = netdev_priv(dev);
 982         struct team_port *port;
 983
 984         rcu_read_lock();
 985         list_for_each_entry_rcu(port, &team->port_list, list)
 986                 vlan_vid_del(port->dev, vid);
 987         rcu_read_unlock();
 988
 989         return 0;
 990 }
 991
 992 static int team_add_slave(struct net_device *dev, struct net_device *port_dev)
 993 {
 994         struct team *team = netdev_priv(dev);
 995         int err;
 996
 997         mutex_lock(&team->lock);
 998         err = team_port_add(team, port_dev);
 999         mutex_unlock(&team->lock);
1000         return err;
1001 }
1002
1003 static int team_del_slave(struct net_device *dev, struct net_device *port_dev)
1004 {
1005         struct team *team = netdev_priv(dev);
1006         int err;
1007
1008         mutex_lock(&team->lock);
1009         err = team_port_del(team, port_dev);
1010         mutex_unlock(&team->lock);
1011         return err;
1012 }
1013
1014 static netdev_features_t team_fix_features(struct net_device *dev,
1015                                            netdev_features_t features)
1016 {
1017         struct team_port *port;
1018         struct team *team = netdev_priv(dev);
1019         netdev_features_t mask;
1020
1021         mask = features;
1022         features &= ~NETIF_F_ONE_FOR_ALL;
1023         features |= NETIF_F_ALL_FOR_ALL;
1024
1025         rcu_read_lock();
1026         list_for_each_entry_rcu(port, &team->port_list, list) {
1027                 features = netdev_increment_features(features,
1028                                                      port->dev->features,
1029                                                      mask);
1030         }
1031         rcu_read_unlock();
1032         return features;
1033 }
1034
1035 static const struct net_device_ops team_netdev_ops = {
1036         .ndo_init               = team_init,
1037         .ndo_uninit             = team_uninit,
1038         .ndo_open               = team_open,
1039         .ndo_stop               = team_close,
1040         .ndo_start_xmit         = team_xmit,
1041         .ndo_change_rx_flags    = team_change_rx_flags,
1042         .ndo_set_rx_mode        = team_set_rx_mode,
1043         .ndo_set_mac_address    = team_set_mac_address,
1044         .ndo_change_mtu         = team_change_mtu,
1045         .ndo_get_stats64        = team_get_stats64,
1046         .ndo_vlan_rx_add_vid    = team_vlan_rx_add_vid,
1047         .ndo_vlan_rx_kill_vid   = team_vlan_rx_kill_vid,
1048         .ndo_add_slave          = team_add_slave,
1049         .ndo_del_slave          = team_del_slave,
1050         .ndo_fix_features       = team_fix_features,
1051 };
1052
1053
1054 /***********************
1055  * rt netlink interface
1056  ***********************/
1057
1058 static void team_setup(struct net_device *dev)
1059 {
1060         ether_setup(dev);
1061
1062         dev->netdev_ops = &team_netdev_ops;
1063         dev->destructor = team_destructor;
1064         dev->tx_queue_len = 0;
1065         dev->flags |= IFF_MULTICAST;
1066         dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING);
1067
1068         /*
1069          * Indicate we support unicast address filtering. That way core won't
1070          * bring us to promisc mode in case a unicast addr is added.
1071          * Let this up to underlay drivers.
1072          */
1073         dev->priv_flags |= IFF_UNICAST_FLT;
1074
1075         dev->features |= NETIF_F_LLTX;
1076         dev->features |= NETIF_F_GRO;
1077         dev->hw_features = NETIF_F_HW_VLAN_TX |
1078                            NETIF_F_HW_VLAN_RX |
1079                            NETIF_F_HW_VLAN_FILTER;
1080
1081         dev->features |= dev->hw_features;
1082 }
1083
1084 static int team_newlink(struct net *src_net, struct net_device *dev,
1085                         struct nlattr *tb[], struct nlattr *data[])
1086 {
1087         int err;
1088
1089         if (tb[IFLA_ADDRESS] == NULL)
1090                 random_ether_addr(dev->dev_addr);
1091
1092         err = register_netdevice(dev);
1093         if (err)
1094                 return err;
1095
1096         return 0;
1097 }
1098
1099 static int team_validate(struct nlattr *tb[], struct nlattr *data[])
1100 {
1101         if (tb[IFLA_ADDRESS]) {
1102                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1103                         return -EINVAL;
1104                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1105                         return -EADDRNOTAVAIL;
1106         }
1107         return 0;
1108 }
1109
1110 static struct rtnl_link_ops team_link_ops __read_mostly = {
1111         .kind           = DRV_NAME,
1112         .priv_size      = sizeof(struct team),
1113         .setup          = team_setup,
1114         .newlink        = team_newlink,
1115         .validate       = team_validate,
1116 };
1117
1118
1119 /***********************************
1120  * Generic netlink custom interface
1121  ***********************************/
1122
1123 static struct genl_family team_nl_family = {
1124         .id             = GENL_ID_GENERATE,
1125         .name           = TEAM_GENL_NAME,
1126         .version        = TEAM_GENL_VERSION,
1127         .maxattr        = TEAM_ATTR_MAX,
1128         .netnsok        = true,
1129 };
1130
1131 static const struct nla_policy team_nl_policy[TEAM_ATTR_MAX + 1] = {
1132         [TEAM_ATTR_UNSPEC]                      = { .type = NLA_UNSPEC, },
1133         [TEAM_ATTR_TEAM_IFINDEX]                = { .type = NLA_U32 },
1134         [TEAM_ATTR_LIST_OPTION]                 = { .type = NLA_NESTED },
1135         [TEAM_ATTR_LIST_PORT]                   = { .type = NLA_NESTED },
1136 };
1137
1138 static const struct nla_policy
1139 team_nl_option_policy[TEAM_ATTR_OPTION_MAX + 1] = {
1140         [TEAM_ATTR_OPTION_UNSPEC]               = { .type = NLA_UNSPEC, },
1141         [TEAM_ATTR_OPTION_NAME] = {
1142                 .type = NLA_STRING,
1143                 .len = TEAM_STRING_MAX_LEN,
1144         },
1145         [TEAM_ATTR_OPTION_CHANGED]              = { .type = NLA_FLAG },
1146         [TEAM_ATTR_OPTION_TYPE]                 = { .type = NLA_U8 },
1147         [TEAM_ATTR_OPTION_DATA] = {
1148                 .type = NLA_BINARY,
1149                 .len = TEAM_STRING_MAX_LEN,
1150         },
1151 };
1152
1153 static int team_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info)
1154 {
1155         struct sk_buff *msg;
1156         void *hdr;
1157         int err;
1158
1159         msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1160         if (!msg)
1161                 return -ENOMEM;
1162
1163         hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
1164                           &team_nl_family, 0, TEAM_CMD_NOOP);
1165         if (IS_ERR(hdr)) {
1166                 err = PTR_ERR(hdr);
1167                 goto err_msg_put;
1168         }
1169
1170         genlmsg_end(msg, hdr);
1171
1172         return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid);
1173
1174 err_msg_put:
1175         nlmsg_free(msg);
1176
1177         return err;
1178 }
1179
1180 /*
1181  * Netlink cmd functions should be locked by following two functions.
1182  * Since dev gets held here, that ensures dev won't disappear in between.
1183  */
1184 static struct team *team_nl_team_get(struct genl_info *info)
1185 {
1186         struct net *net = genl_info_net(info);
1187         int ifindex;
1188         struct net_device *dev;
1189         struct team *team;
1190
1191         if (!info->attrs[TEAM_ATTR_TEAM_IFINDEX])
1192                 return NULL;
1193
1194         ifindex = nla_get_u32(info->attrs[TEAM_ATTR_TEAM_IFINDEX]);
1195         dev = dev_get_by_index(net, ifindex);
1196         if (!dev || dev->netdev_ops != &team_netdev_ops) {
1197                 if (dev)
1198                         dev_put(dev);
1199                 return NULL;
1200         }
1201
1202         team = netdev_priv(dev);
1203         mutex_lock(&team->lock);
1204         return team;
1205 }
1206
1207 static void team_nl_team_put(struct team *team)
1208 {
1209         mutex_unlock(&team->lock);
1210         dev_put(team->dev);
1211 }
1212
1213 static int team_nl_send_generic(struct genl_info *info, struct team *team,
1214                                 int (*fill_func)(struct sk_buff *skb,
1215                                                  struct genl_info *info,
1216                                                  int flags, struct team *team))
1217 {
1218         struct sk_buff *skb;
1219         int err;
1220
1221         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1222         if (!skb)
1223                 return -ENOMEM;
1224
1225         err = fill_func(skb, info, NLM_F_ACK, team);
1226         if (err < 0)
1227                 goto err_fill;
1228
1229         err = genlmsg_unicast(genl_info_net(info), skb, info->snd_pid);
1230         return err;
1231
1232 err_fill:
1233         nlmsg_free(skb);
1234         return err;
1235 }
1236
1237 static int team_nl_fill_options_get(struct sk_buff *skb,
1238                                     u32 pid, u32 seq, int flags,
1239                                     struct team *team, bool fillall)
1240 {
1241         struct nlattr *option_list;
1242         void *hdr;
1243         struct team_option *option;
1244
1245         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags,
1246                           TEAM_CMD_OPTIONS_GET);
1247         if (IS_ERR(hdr))
1248                 return PTR_ERR(hdr);
1249
1250         NLA_PUT_U32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex);
1251         option_list = nla_nest_start(skb, TEAM_ATTR_LIST_OPTION);
1252         if (!option_list)
1253                 return -EMSGSIZE;
1254
1255         list_for_each_entry(option, &team->option_list, list) {
1256                 struct nlattr *option_item;
1257                 long arg;
1258
1259                 /* Include only changed options if fill all mode is not on */
1260                 if (!fillall && !option->changed)
1261                         continue;
1262                 option_item = nla_nest_start(skb, TEAM_ATTR_ITEM_OPTION);
1263                 if (!option_item)
1264                         goto nla_put_failure;
1265                 NLA_PUT_STRING(skb, TEAM_ATTR_OPTION_NAME, option->name);
1266                 if (option->changed) {
1267                         NLA_PUT_FLAG(skb, TEAM_ATTR_OPTION_CHANGED);
1268                         option->changed = false;
1269                 }
1270                 if (option->removed)
1271                         NLA_PUT_FLAG(skb, TEAM_ATTR_OPTION_REMOVED);
1272                 switch (option->type) {
1273                 case TEAM_OPTION_TYPE_U32:
1274                         NLA_PUT_U8(skb, TEAM_ATTR_OPTION_TYPE, NLA_U32);
1275                         team_option_get(team, option, &arg);
1276                         NLA_PUT_U32(skb, TEAM_ATTR_OPTION_DATA, arg);
1277                         break;
1278                 case TEAM_OPTION_TYPE_STRING:
1279                         NLA_PUT_U8(skb, TEAM_ATTR_OPTION_TYPE, NLA_STRING);
1280                         team_option_get(team, option, &arg);
1281                         NLA_PUT_STRING(skb, TEAM_ATTR_OPTION_DATA,
1282                                        (char *) arg);
1283                         break;
1284                 default:
1285                         BUG();
1286                 }
1287                 nla_nest_end(skb, option_item);
1288         }
1289
1290         nla_nest_end(skb, option_list);
1291         return genlmsg_end(skb, hdr);
1292
1293 nla_put_failure:
1294         genlmsg_cancel(skb, hdr);
1295         return -EMSGSIZE;
1296 }
1297
1298 static int team_nl_fill_options_get_all(struct sk_buff *skb,
1299                                         struct genl_info *info, int flags,
1300                                         struct team *team)
1301 {
1302         return team_nl_fill_options_get(skb, info->snd_pid,
1303                                         info->snd_seq, NLM_F_ACK,
1304                                         team, true);
1305 }
1306
1307 static int team_nl_cmd_options_get(struct sk_buff *skb, struct genl_info *info)
1308 {
1309         struct team *team;
1310         int err;
1311
1312         team = team_nl_team_get(info);
1313         if (!team)
1314                 return -EINVAL;
1315
1316         err = team_nl_send_generic(info, team, team_nl_fill_options_get_all);
1317
1318         team_nl_team_put(team);
1319
1320         return err;
1321 }
1322
1323 static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info)
1324 {
1325         struct team *team;
1326         int err = 0;
1327         int i;
1328         struct nlattr *nl_option;
1329
1330         team = team_nl_team_get(info);
1331         if (!team)
1332                 return -EINVAL;
1333
1334         err = -EINVAL;
1335         if (!info->attrs[TEAM_ATTR_LIST_OPTION]) {
1336                 err = -EINVAL;
1337                 goto team_put;
1338         }
1339
1340         nla_for_each_nested(nl_option, info->attrs[TEAM_ATTR_LIST_OPTION], i) {
1341                 struct nlattr *mode_attrs[TEAM_ATTR_OPTION_MAX + 1];
1342                 enum team_option_type opt_type;
1343                 struct team_option *option;
1344                 char *opt_name;
1345                 bool opt_found = false;
1346
1347                 if (nla_type(nl_option) != TEAM_ATTR_ITEM_OPTION) {
1348                         err = -EINVAL;
1349                         goto team_put;
1350                 }
1351                 err = nla_parse_nested(mode_attrs, TEAM_ATTR_OPTION_MAX,
1352                                        nl_option, team_nl_option_policy);
1353                 if (err)
1354                         goto team_put;
1355                 if (!mode_attrs[TEAM_ATTR_OPTION_NAME] ||
1356                     !mode_attrs[TEAM_ATTR_OPTION_TYPE] ||
1357                     !mode_attrs[TEAM_ATTR_OPTION_DATA]) {
1358                         err = -EINVAL;
1359                         goto team_put;
1360                 }
1361                 switch (nla_get_u8(mode_attrs[TEAM_ATTR_OPTION_TYPE])) {
1362                 case NLA_U32:
1363                         opt_type = TEAM_OPTION_TYPE_U32;
1364                         break;
1365                 case NLA_STRING:
1366                         opt_type = TEAM_OPTION_TYPE_STRING;
1367                         break;
1368                 default:
1369                         goto team_put;
1370                 }
1371
1372                 opt_name = nla_data(mode_attrs[TEAM_ATTR_OPTION_NAME]);
1373                 list_for_each_entry(option, &team->option_list, list) {
1374                         long arg;
1375                         struct nlattr *opt_data_attr;
1376
1377                         if (option->type != opt_type ||
1378                             strcmp(option->name, opt_name))
1379                                 continue;
1380                         opt_found = true;
1381                         opt_data_attr = mode_attrs[TEAM_ATTR_OPTION_DATA];
1382                         switch (opt_type) {
1383                         case TEAM_OPTION_TYPE_U32:
1384                                 arg = nla_get_u32(opt_data_attr);
1385                                 break;
1386                         case TEAM_OPTION_TYPE_STRING:
1387                                 arg = (long) nla_data(opt_data_attr);
1388                                 break;
1389                         default:
1390                                 BUG();
1391                         }
1392                         err = team_option_set(team, option, &arg);
1393                         if (err)
1394                                 goto team_put;
1395                 }
1396                 if (!opt_found) {
1397                         err = -ENOENT;
1398                         goto team_put;
1399                 }
1400         }
1401
1402 team_put:
1403         team_nl_team_put(team);
1404
1405         return err;
1406 }
1407
1408 static int team_nl_fill_port_list_get(struct sk_buff *skb,
1409                                       u32 pid, u32 seq, int flags,
1410                                       struct team *team,
1411                                       bool fillall)
1412 {
1413         struct nlattr *port_list;
1414         void *hdr;
1415         struct team_port *port;
1416
1417         hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags,
1418                           TEAM_CMD_PORT_LIST_GET);
1419         if (IS_ERR(hdr))
1420                 return PTR_ERR(hdr);
1421
1422         NLA_PUT_U32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex);
1423         port_list = nla_nest_start(skb, TEAM_ATTR_LIST_PORT);
1424         if (!port_list)
1425                 return -EMSGSIZE;
1426
1427         list_for_each_entry(port, &team->port_list, list) {
1428                 struct nlattr *port_item;
1429
1430                 /* Include only changed ports if fill all mode is not on */
1431                 if (!fillall && !port->changed)
1432                         continue;
1433                 port_item = nla_nest_start(skb, TEAM_ATTR_ITEM_PORT);
1434                 if (!port_item)
1435                         goto nla_put_failure;
1436                 NLA_PUT_U32(skb, TEAM_ATTR_PORT_IFINDEX, port->dev->ifindex);
1437                 if (port->changed) {
1438                         NLA_PUT_FLAG(skb, TEAM_ATTR_PORT_CHANGED);
1439                         port->changed = false;
1440                 }
1441                 if (port->removed)
1442                         NLA_PUT_FLAG(skb, TEAM_ATTR_PORT_REMOVED);
1443                 if (port->linkup)
1444                         NLA_PUT_FLAG(skb, TEAM_ATTR_PORT_LINKUP);
1445                 NLA_PUT_U32(skb, TEAM_ATTR_PORT_SPEED, port->speed);
1446                 NLA_PUT_U8(skb, TEAM_ATTR_PORT_DUPLEX, port->duplex);
1447                 nla_nest_end(skb, port_item);
1448         }
1449
1450         nla_nest_end(skb, port_list);
1451         return genlmsg_end(skb, hdr);
1452
1453 nla_put_failure:
1454         genlmsg_cancel(skb, hdr);
1455         return -EMSGSIZE;
1456 }
1457
1458 static int team_nl_fill_port_list_get_all(struct sk_buff *skb,
1459                                           struct genl_info *info, int flags,
1460                                           struct team *team)
1461 {
1462         return team_nl_fill_port_list_get(skb, info->snd_pid,
1463                                           info->snd_seq, NLM_F_ACK,
1464                                           team, true);
1465 }
1466
1467 static int team_nl_cmd_port_list_get(struct sk_buff *skb,
1468                                      struct genl_info *info)
1469 {
1470         struct team *team;
1471         int err;
1472
1473         team = team_nl_team_get(info);
1474         if (!team)
1475                 return -EINVAL;
1476
1477         err = team_nl_send_generic(info, team, team_nl_fill_port_list_get_all);
1478
1479         team_nl_team_put(team);
1480
1481         return err;
1482 }
1483
1484 static struct genl_ops team_nl_ops[] = {
1485         {
1486                 .cmd = TEAM_CMD_NOOP,
1487                 .doit = team_nl_cmd_noop,
1488                 .policy = team_nl_policy,
1489         },
1490         {
1491                 .cmd = TEAM_CMD_OPTIONS_SET,
1492                 .doit = team_nl_cmd_options_set,
1493                 .policy = team_nl_policy,
1494                 .flags = GENL_ADMIN_PERM,
1495         },
1496         {
1497                 .cmd = TEAM_CMD_OPTIONS_GET,
1498                 .doit = team_nl_cmd_options_get,
1499                 .policy = team_nl_policy,
1500                 .flags = GENL_ADMIN_PERM,
1501         },
1502         {
1503                 .cmd = TEAM_CMD_PORT_LIST_GET,
1504                 .doit = team_nl_cmd_port_list_get,
1505                 .policy = team_nl_policy,
1506                 .flags = GENL_ADMIN_PERM,
1507         },
1508 };
1509
1510 static struct genl_multicast_group team_change_event_mcgrp = {
1511         .name = TEAM_GENL_CHANGE_EVENT_MC_GRP_NAME,
1512 };
1513
1514 static int team_nl_send_event_options_get(struct team *team)
1515 {
1516         struct sk_buff *skb;
1517         int err;
1518         struct net *net = dev_net(team->dev);
1519
1520         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1521         if (!skb)
1522                 return -ENOMEM;
1523
1524         err = team_nl_fill_options_get(skb, 0, 0, 0, team, false);
1525         if (err < 0)
1526                 goto err_fill;
1527
1528         err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id,
1529                                       GFP_KERNEL);
1530         return err;
1531
1532 err_fill:
1533         nlmsg_free(skb);
1534         return err;
1535 }
1536
1537 static int team_nl_send_event_port_list_get(struct team *team)
1538 {
1539         struct sk_buff *skb;
1540         int err;
1541         struct net *net = dev_net(team->dev);
1542
1543         skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
1544         if (!skb)
1545                 return -ENOMEM;
1546
1547         err = team_nl_fill_port_list_get(skb, 0, 0, 0, team, false);
1548         if (err < 0)
1549                 goto err_fill;
1550
1551         err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id,
1552                                       GFP_KERNEL);
1553         return err;
1554
1555 err_fill:
1556         nlmsg_free(skb);
1557         return err;
1558 }
1559
1560 static int team_nl_init(void)
1561 {
1562         int err;
1563
1564         err = genl_register_family_with_ops(&team_nl_family, team_nl_ops,
1565                                             ARRAY_SIZE(team_nl_ops));
1566         if (err)
1567                 return err;
1568
1569         err = genl_register_mc_group(&team_nl_family, &team_change_event_mcgrp);
1570         if (err)
1571                 goto err_change_event_grp_reg;
1572
1573         return 0;
1574
1575 err_change_event_grp_reg:
1576         genl_unregister_family(&team_nl_family);
1577
1578         return err;
1579 }
1580
1581 static void team_nl_fini(void)
1582 {
1583         genl_unregister_family(&team_nl_family);
1584 }
1585
1586
1587 /******************
1588  * Change checkers
1589  ******************/
1590
1591 static void __team_options_change_check(struct team *team)
1592 {
1593         int err;
1594
1595         err = team_nl_send_event_options_get(team);
1596         if (err)
1597                 netdev_warn(team->dev, "Failed to send options change via netlink\n");
1598 }
1599
1600 /* rtnl lock is held */
1601 static void __team_port_change_check(struct team_port *port, bool linkup)
1602 {
1603         int err;
1604
1605         if (!port->removed && port->linkup == linkup)
1606                 return;
1607
1608         port->changed = true;
1609         port->linkup = linkup;
1610         if (linkup) {
1611                 struct ethtool_cmd ecmd;
1612
1613                 err = __ethtool_get_settings(port->dev, &ecmd);
1614                 if (!err) {
1615                         port->speed = ethtool_cmd_speed(&ecmd);
1616                         port->duplex = ecmd.duplex;
1617                         goto send_event;
1618                 }
1619         }
1620         port->speed = 0;
1621         port->duplex = 0;
1622
1623 send_event:
1624         err = team_nl_send_event_port_list_get(port->team);
1625         if (err)
1626                 netdev_warn(port->team->dev, "Failed to send port change of device %s via netlink\n",
1627                             port->dev->name);
1628
1629 }
1630
1631 static void team_port_change_check(struct team_port *port, bool linkup)
1632 {
1633         struct team *team = port->team;
1634
1635         mutex_lock(&team->lock);
1636         __team_port_change_check(port, linkup);
1637         mutex_unlock(&team->lock);
1638 }
1639
1640 /************************************
1641  * Net device notifier event handler
1642  ************************************/
1643
1644 static int team_device_event(struct notifier_block *unused,
1645                              unsigned long event, void *ptr)
1646 {
1647         struct net_device *dev = (struct net_device *) ptr;
1648         struct team_port *port;
1649
1650         port = team_port_get_rtnl(dev);
1651         if (!port)
1652                 return NOTIFY_DONE;
1653
1654         switch (event) {
1655         case NETDEV_UP:
1656                 if (netif_carrier_ok(dev))
1657                         team_port_change_check(port, true);
1658         case NETDEV_DOWN:
1659                 team_port_change_check(port, false);
1660         case NETDEV_CHANGE:
1661                 if (netif_running(port->dev))
1662                         team_port_change_check(port,
1663                                                !!netif_carrier_ok(port->dev));
1664                 break;
1665         case NETDEV_UNREGISTER:
1666                 team_del_slave(port->team->dev, dev);
1667                 break;
1668         case NETDEV_FEAT_CHANGE:
1669                 team_compute_features(port->team);
1670                 break;
1671         case NETDEV_CHANGEMTU:
1672                 /* Forbid to change mtu of underlaying device */
1673                 return NOTIFY_BAD;
1674         case NETDEV_PRE_TYPE_CHANGE:
1675                 /* Forbid to change type of underlaying device */
1676                 return NOTIFY_BAD;
1677         }
1678         return NOTIFY_DONE;
1679 }
1680
1681 static struct notifier_block team_notifier_block __read_mostly = {
1682         .notifier_call = team_device_event,
1683 };
1684
1685
1686 /***********************
1687  * Module init and exit
1688  ***********************/
1689
1690 static int __init team_module_init(void)
1691 {
1692         int err;
1693
1694         register_netdevice_notifier(&team_notifier_block);
1695
1696         err = rtnl_link_register(&team_link_ops);
1697         if (err)
1698                 goto err_rtnl_reg;
1699
1700         err = team_nl_init();
1701         if (err)
1702                 goto err_nl_init;
1703
1704         return 0;
1705
1706 err_nl_init:
1707         rtnl_link_unregister(&team_link_ops);
1708
1709 err_rtnl_reg:
1710         unregister_netdevice_notifier(&team_notifier_block);
1711
1712         return err;
1713 }
1714
1715 static void __exit team_module_exit(void)
1716 {
1717         team_nl_fini();
1718         rtnl_link_unregister(&team_link_ops);
1719         unregister_netdevice_notifier(&team_notifier_block);
1720 }
1721
1722 module_init(team_module_init);
1723 module_exit(team_module_exit);
1724
1725 MODULE_LICENSE("GPL v2");
1726 MODULE_AUTHOR("Jiri Pirko <jpirko@redhat.com>");
1727 MODULE_DESCRIPTION("Ethernet team device driver");
1728 MODULE_ALIAS_RTNL_LINK(DRV_NAME);