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