net/switchdev/switchdev.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * net/switchdev/switchdev.c - Switch device API
   4  * Copyright (c) 2014-2015 Jiri Pirko <jiri@resnulli.us>
   5  * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/types.h>
  10 #include <linux/init.h>
  11 #include <linux/mutex.h>
  12 #include <linux/notifier.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/etherdevice.h>
  15 #include <linux/if_bridge.h>
  16 #include <linux/list.h>
  17 #include <linux/workqueue.h>
  18 #include <linux/if_vlan.h>
  19 #include <linux/rtnetlink.h>
  20 #include <net/switchdev.h>
  21
  22 static LIST_HEAD(deferred);
  23 static DEFINE_SPINLOCK(deferred_lock);
  24
  25 typedef void switchdev_deferred_func_t(struct net_device *dev,
  26                                        const void *data);
  27
  28 struct switchdev_deferred_item {
  29         struct list_head list;
  30         struct net_device *dev;
  31         switchdev_deferred_func_t *func;
  32         unsigned long data[];
  33 };
  34
  35 static struct switchdev_deferred_item *switchdev_deferred_dequeue(void)
  36 {
  37         struct switchdev_deferred_item *dfitem;
  38
  39         spin_lock_bh(&deferred_lock);
  40         if (list_empty(&deferred)) {
  41                 dfitem = NULL;
  42                 goto unlock;
  43         }
  44         dfitem = list_first_entry(&deferred,
  45                                   struct switchdev_deferred_item, list);
  46         list_del(&dfitem->list);
  47 unlock:
  48         spin_unlock_bh(&deferred_lock);
  49         return dfitem;
  50 }
  51
  52 /**
  53  *      switchdev_deferred_process - Process ops in deferred queue
  54  *
  55  *      Called to flush the ops currently queued in deferred ops queue.
  56  *      rtnl_lock must be held.
  57  */
  58 void switchdev_deferred_process(void)
  59 {
  60         struct switchdev_deferred_item *dfitem;
  61
  62         ASSERT_RTNL();
  63
  64         while ((dfitem = switchdev_deferred_dequeue())) {
  65                 dfitem->func(dfitem->dev, dfitem->data);
  66                 dev_put(dfitem->dev);
  67                 kfree(dfitem);
  68         }
  69 }
  70 EXPORT_SYMBOL_GPL(switchdev_deferred_process);
  71
  72 static void switchdev_deferred_process_work(struct work_struct *work)
  73 {
  74         rtnl_lock();
  75         switchdev_deferred_process();
  76         rtnl_unlock();
  77 }
  78
  79 static DECLARE_WORK(deferred_process_work, switchdev_deferred_process_work);
  80
  81 static int switchdev_deferred_enqueue(struct net_device *dev,
  82                                       const void *data, size_t data_len,
  83                                       switchdev_deferred_func_t *func)
  84 {
  85         struct switchdev_deferred_item *dfitem;
  86
  87         dfitem = kmalloc(sizeof(*dfitem) + data_len, GFP_ATOMIC);
  88         if (!dfitem)
  89                 return -ENOMEM;
  90         dfitem->dev = dev;
  91         dfitem->func = func;
  92         memcpy(dfitem->data, data, data_len);
  93         dev_hold(dev);
  94         spin_lock_bh(&deferred_lock);
  95         list_add_tail(&dfitem->list, &deferred);
  96         spin_unlock_bh(&deferred_lock);
  97         schedule_work(&deferred_process_work);
  98         return 0;
  99 }
 100
 101 static int switchdev_port_attr_notify(enum switchdev_notifier_type nt,
 102                                       struct net_device *dev,
 103                                       const struct switchdev_attr *attr,
 104                                       struct netlink_ext_ack *extack)
 105 {
 106         int err;
 107         int rc;
 108
 109         struct switchdev_notifier_port_attr_info attr_info = {
 110                 .attr = attr,
 111                 .handled = false,
 112         };
 113
 114         rc = call_switchdev_blocking_notifiers(nt, dev,
 115                                                &attr_info.info, extack);
 116         err = notifier_to_errno(rc);
 117         if (err) {
 118                 WARN_ON(!attr_info.handled);
 119                 return err;
 120         }
 121
 122         if (!attr_info.handled)
 123                 return -EOPNOTSUPP;
 124
 125         return 0;
 126 }
 127
 128 static int switchdev_port_attr_set_now(struct net_device *dev,
 129                                        const struct switchdev_attr *attr,
 130                                        struct netlink_ext_ack *extack)
 131 {
 132         return switchdev_port_attr_notify(SWITCHDEV_PORT_ATTR_SET, dev, attr,
 133                                           extack);
 134 }
 135
 136 static void switchdev_port_attr_set_deferred(struct net_device *dev,
 137                                              const void *data)
 138 {
 139         const struct switchdev_attr *attr = data;
 140         int err;
 141
 142         err = switchdev_port_attr_set_now(dev, attr, NULL);
 143         if (err && err != -EOPNOTSUPP)
 144                 netdev_err(dev, "failed (err=%d) to set attribute (id=%d)\n",
 145                            err, attr->id);
 146         if (attr->complete)
 147                 attr->complete(dev, err, attr->complete_priv);
 148 }
 149
 150 static int switchdev_port_attr_set_defer(struct net_device *dev,
 151                                          const struct switchdev_attr *attr)
 152 {
 153         return switchdev_deferred_enqueue(dev, attr, sizeof(*attr),
 154                                           switchdev_port_attr_set_deferred);
 155 }
 156
 157 /**
 158  *      switchdev_port_attr_set - Set port attribute
 159  *
 160  *      @dev: port device
 161  *      @attr: attribute to set
 162  *      @extack: netlink extended ack, for error message propagation
 163  *
 164  *      rtnl_lock must be held and must not be in atomic section,
 165  *      in case SWITCHDEV_F_DEFER flag is not set.
 166  */
 167 int switchdev_port_attr_set(struct net_device *dev,
 168                             const struct switchdev_attr *attr,
 169                             struct netlink_ext_ack *extack)
 170 {
 171         if (attr->flags & SWITCHDEV_F_DEFER)
 172                 return switchdev_port_attr_set_defer(dev, attr);
 173         ASSERT_RTNL();
 174         return switchdev_port_attr_set_now(dev, attr, extack);
 175 }
 176 EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
 177
 178 static size_t switchdev_obj_size(const struct switchdev_obj *obj)
 179 {
 180         switch (obj->id) {
 181         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 182                 return sizeof(struct switchdev_obj_port_vlan);
 183         case SWITCHDEV_OBJ_ID_PORT_MDB:
 184                 return sizeof(struct switchdev_obj_port_mdb);
 185         case SWITCHDEV_OBJ_ID_HOST_MDB:
 186                 return sizeof(struct switchdev_obj_port_mdb);
 187         default:
 188                 BUG();
 189         }
 190         return 0;
 191 }
 192
 193 static int switchdev_port_obj_notify(enum switchdev_notifier_type nt,
 194                                      struct net_device *dev,
 195                                      const struct switchdev_obj *obj,
 196                                      struct netlink_ext_ack *extack)
 197 {
 198         int rc;
 199         int err;
 200
 201         struct switchdev_notifier_port_obj_info obj_info = {
 202                 .obj = obj,
 203                 .handled = false,
 204         };
 205
 206         rc = call_switchdev_blocking_notifiers(nt, dev, &obj_info.info, extack);
 207         err = notifier_to_errno(rc);
 208         if (err) {
 209                 WARN_ON(!obj_info.handled);
 210                 return err;
 211         }
 212         if (!obj_info.handled)
 213                 return -EOPNOTSUPP;
 214         return 0;
 215 }
 216
 217 static void switchdev_port_obj_add_deferred(struct net_device *dev,
 218                                             const void *data)
 219 {
 220         const struct switchdev_obj *obj = data;
 221         int err;
 222
 223         ASSERT_RTNL();
 224         err = switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD,
 225                                         dev, obj, NULL);
 226         if (err && err != -EOPNOTSUPP)
 227                 netdev_err(dev, "failed (err=%d) to add object (id=%d)\n",
 228                            err, obj->id);
 229         if (obj->complete)
 230                 obj->complete(dev, err, obj->complete_priv);
 231 }
 232
 233 static int switchdev_port_obj_add_defer(struct net_device *dev,
 234                                         const struct switchdev_obj *obj)
 235 {
 236         return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
 237                                           switchdev_port_obj_add_deferred);
 238 }
 239
 240 /**
 241  *      switchdev_port_obj_add - Add port object
 242  *
 243  *      @dev: port device
 244  *      @obj: object to add
 245  *      @extack: netlink extended ack
 246  *
 247  *      rtnl_lock must be held and must not be in atomic section,
 248  *      in case SWITCHDEV_F_DEFER flag is not set.
 249  */
 250 int switchdev_port_obj_add(struct net_device *dev,
 251                            const struct switchdev_obj *obj,
 252                            struct netlink_ext_ack *extack)
 253 {
 254         if (obj->flags & SWITCHDEV_F_DEFER)
 255                 return switchdev_port_obj_add_defer(dev, obj);
 256         ASSERT_RTNL();
 257         return switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_ADD,
 258                                          dev, obj, extack);
 259 }
 260 EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
 261
 262 static int switchdev_port_obj_del_now(struct net_device *dev,
 263                                       const struct switchdev_obj *obj)
 264 {
 265         return switchdev_port_obj_notify(SWITCHDEV_PORT_OBJ_DEL,
 266                                          dev, obj, NULL);
 267 }
 268
 269 static void switchdev_port_obj_del_deferred(struct net_device *dev,
 270                                             const void *data)
 271 {
 272         const struct switchdev_obj *obj = data;
 273         int err;
 274
 275         err = switchdev_port_obj_del_now(dev, obj);
 276         if (err && err != -EOPNOTSUPP)
 277                 netdev_err(dev, "failed (err=%d) to del object (id=%d)\n",
 278                            err, obj->id);
 279         if (obj->complete)
 280                 obj->complete(dev, err, obj->complete_priv);
 281 }
 282
 283 static int switchdev_port_obj_del_defer(struct net_device *dev,
 284                                         const struct switchdev_obj *obj)
 285 {
 286         return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
 287                                           switchdev_port_obj_del_deferred);
 288 }
 289
 290 /**
 291  *      switchdev_port_obj_del - Delete port object
 292  *
 293  *      @dev: port device
 294  *      @obj: object to delete
 295  *
 296  *      rtnl_lock must be held and must not be in atomic section,
 297  *      in case SWITCHDEV_F_DEFER flag is not set.
 298  */
 299 int switchdev_port_obj_del(struct net_device *dev,
 300                            const struct switchdev_obj *obj)
 301 {
 302         if (obj->flags & SWITCHDEV_F_DEFER)
 303                 return switchdev_port_obj_del_defer(dev, obj);
 304         ASSERT_RTNL();
 305         return switchdev_port_obj_del_now(dev, obj);
 306 }
 307 EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
 308
 309 static ATOMIC_NOTIFIER_HEAD(switchdev_notif_chain);
 310 static BLOCKING_NOTIFIER_HEAD(switchdev_blocking_notif_chain);
 311
 312 /**
 313  *      register_switchdev_notifier - Register notifier
 314  *      @nb: notifier_block
 315  *
 316  *      Register switch device notifier.
 317  */
 318 int register_switchdev_notifier(struct notifier_block *nb)
 319 {
 320         return atomic_notifier_chain_register(&switchdev_notif_chain, nb);
 321 }
 322 EXPORT_SYMBOL_GPL(register_switchdev_notifier);
 323
 324 /**
 325  *      unregister_switchdev_notifier - Unregister notifier
 326  *      @nb: notifier_block
 327  *
 328  *      Unregister switch device notifier.
 329  */
 330 int unregister_switchdev_notifier(struct notifier_block *nb)
 331 {
 332         return atomic_notifier_chain_unregister(&switchdev_notif_chain, nb);
 333 }
 334 EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
 335
 336 /**
 337  *      call_switchdev_notifiers - Call notifiers
 338  *      @val: value passed unmodified to notifier function
 339  *      @dev: port device
 340  *      @info: notifier information data
 341  *      @extack: netlink extended ack
 342  *      Call all network notifier blocks.
 343  */
 344 int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
 345                              struct switchdev_notifier_info *info,
 346                              struct netlink_ext_ack *extack)
 347 {
 348         info->dev = dev;
 349         info->extack = extack;
 350         return atomic_notifier_call_chain(&switchdev_notif_chain, val, info);
 351 }
 352 EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
 353
 354 int register_switchdev_blocking_notifier(struct notifier_block *nb)
 355 {
 356         struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain;
 357
 358         return blocking_notifier_chain_register(chain, nb);
 359 }
 360 EXPORT_SYMBOL_GPL(register_switchdev_blocking_notifier);
 361
 362 int unregister_switchdev_blocking_notifier(struct notifier_block *nb)
 363 {
 364         struct blocking_notifier_head *chain = &switchdev_blocking_notif_chain;
 365
 366         return blocking_notifier_chain_unregister(chain, nb);
 367 }
 368 EXPORT_SYMBOL_GPL(unregister_switchdev_blocking_notifier);
 369
 370 int call_switchdev_blocking_notifiers(unsigned long val, struct net_device *dev,
 371                                       struct switchdev_notifier_info *info,
 372                                       struct netlink_ext_ack *extack)
 373 {
 374         info->dev = dev;
 375         info->extack = extack;
 376         return blocking_notifier_call_chain(&switchdev_blocking_notif_chain,
 377                                             val, info);
 378 }
 379 EXPORT_SYMBOL_GPL(call_switchdev_blocking_notifiers);
 380
 381 struct switchdev_nested_priv {
 382         bool (*check_cb)(const struct net_device *dev);
 383         bool (*foreign_dev_check_cb)(const struct net_device *dev,
 384                                      const struct net_device *foreign_dev);
 385         const struct net_device *dev;
 386         struct net_device *lower_dev;
 387 };
 388
 389 static int switchdev_lower_dev_walk(struct net_device *lower_dev,
 390                                     struct netdev_nested_priv *priv)
 391 {
 392         struct switchdev_nested_priv *switchdev_priv = priv->data;
 393         bool (*foreign_dev_check_cb)(const struct net_device *dev,
 394                                      const struct net_device *foreign_dev);
 395         bool (*check_cb)(const struct net_device *dev);
 396         const struct net_device *dev;
 397
 398         check_cb = switchdev_priv->check_cb;
 399         foreign_dev_check_cb = switchdev_priv->foreign_dev_check_cb;
 400         dev = switchdev_priv->dev;
 401
 402         if (check_cb(lower_dev) && !foreign_dev_check_cb(lower_dev, dev)) {
 403                 switchdev_priv->lower_dev = lower_dev;
 404                 return 1;
 405         }
 406
 407         return 0;
 408 }
 409
 410 static struct net_device *
 411 switchdev_lower_dev_find(struct net_device *dev,
 412                          bool (*check_cb)(const struct net_device *dev),
 413                          bool (*foreign_dev_check_cb)(const struct net_device *dev,
 414                                                       const struct net_device *foreign_dev))
 415 {
 416         struct switchdev_nested_priv switchdev_priv = {
 417                 .check_cb = check_cb,
 418                 .foreign_dev_check_cb = foreign_dev_check_cb,
 419                 .dev = dev,
 420                 .lower_dev = NULL,
 421         };
 422         struct netdev_nested_priv priv = {
 423                 .data = &switchdev_priv,
 424         };
 425
 426         netdev_walk_all_lower_dev_rcu(dev, switchdev_lower_dev_walk, &priv);
 427
 428         return switchdev_priv.lower_dev;
 429 }
 430
 431 static int __switchdev_handle_fdb_add_to_device(struct net_device *dev,
 432                 const struct net_device *orig_dev,
 433                 const struct switchdev_notifier_fdb_info *fdb_info,
 434                 bool (*check_cb)(const struct net_device *dev),
 435                 bool (*foreign_dev_check_cb)(const struct net_device *dev,
 436                                              const struct net_device *foreign_dev),
 437                 int (*add_cb)(struct net_device *dev,
 438                               const struct net_device *orig_dev, const void *ctx,
 439                               const struct switchdev_notifier_fdb_info *fdb_info),
 440                 int (*lag_add_cb)(struct net_device *dev,
 441                                   const struct net_device *orig_dev, const void *ctx,
 442                                   const struct switchdev_notifier_fdb_info *fdb_info))
 443 {
 444         const struct switchdev_notifier_info *info = &fdb_info->info;
 445         struct net_device *br, *lower_dev;
 446         struct list_head *iter;
 447         int err = -EOPNOTSUPP;
 448
 449         if (check_cb(dev))
 450                 return add_cb(dev, orig_dev, info->ctx, fdb_info);
 451
 452         if (netif_is_lag_master(dev)) {
 453                 if (!switchdev_lower_dev_find(dev, check_cb, foreign_dev_check_cb))
 454                         goto maybe_bridged_with_us;
 455
 456                 /* This is a LAG interface that we offload */
 457                 if (!lag_add_cb)
 458                         return -EOPNOTSUPP;
 459
 460                 return lag_add_cb(dev, orig_dev, info->ctx, fdb_info);
 461         }
 462
 463         /* Recurse through lower interfaces in case the FDB entry is pointing
 464          * towards a bridge device.
 465          */
 466         if (netif_is_bridge_master(dev)) {
 467                 if (!switchdev_lower_dev_find(dev, check_cb, foreign_dev_check_cb))
 468                         return 0;
 469
 470                 /* This is a bridge interface that we offload */
 471                 netdev_for_each_lower_dev(dev, lower_dev, iter) {
 472                         /* Do not propagate FDB entries across bridges */
 473                         if (netif_is_bridge_master(lower_dev))
 474                                 continue;
 475
 476                         /* Bridge ports might be either us, or LAG interfaces
 477                          * that we offload.
 478                          */
 479                         if (!check_cb(lower_dev) &&
 480                             !switchdev_lower_dev_find(lower_dev, check_cb,
 481                                                       foreign_dev_check_cb))
 482                                 continue;
 483
 484                         err = __switchdev_handle_fdb_add_to_device(lower_dev, orig_dev,
 485                                                                    fdb_info, check_cb,
 486                                                                    foreign_dev_check_cb,
 487                                                                    add_cb, lag_add_cb);
 488                         if (err && err != -EOPNOTSUPP)
 489                                 return err;
 490                 }
 491
 492                 return 0;
 493         }
 494
 495 maybe_bridged_with_us:
 496         /* Event is neither on a bridge nor a LAG. Check whether it is on an
 497          * interface that is in a bridge with us.
 498          */
 499         br = netdev_master_upper_dev_get_rcu(dev);
 500         if (!br || !netif_is_bridge_master(br))
 501                 return 0;
 502
 503         if (!switchdev_lower_dev_find(br, check_cb, foreign_dev_check_cb))
 504                 return 0;
 505
 506         return __switchdev_handle_fdb_add_to_device(br, orig_dev, fdb_info,
 507                                                     check_cb, foreign_dev_check_cb,
 508                                                     add_cb, lag_add_cb);
 509 }
 510
 511 int switchdev_handle_fdb_add_to_device(struct net_device *dev,
 512                 const struct switchdev_notifier_fdb_info *fdb_info,
 513                 bool (*check_cb)(const struct net_device *dev),
 514                 bool (*foreign_dev_check_cb)(const struct net_device *dev,
 515                                              const struct net_device *foreign_dev),
 516                 int (*add_cb)(struct net_device *dev,
 517                               const struct net_device *orig_dev, const void *ctx,
 518                               const struct switchdev_notifier_fdb_info *fdb_info),
 519                 int (*lag_add_cb)(struct net_device *dev,
 520                                   const struct net_device *orig_dev, const void *ctx,
 521                                   const struct switchdev_notifier_fdb_info *fdb_info))
 522 {
 523         int err;
 524
 525         err = __switchdev_handle_fdb_add_to_device(dev, dev, fdb_info,
 526                                                    check_cb,
 527                                                    foreign_dev_check_cb,
 528                                                    add_cb, lag_add_cb);
 529         if (err == -EOPNOTSUPP)
 530                 err = 0;
 531
 532         return err;
 533 }
 534 EXPORT_SYMBOL_GPL(switchdev_handle_fdb_add_to_device);
 535
 536 static int __switchdev_handle_fdb_del_to_device(struct net_device *dev,
 537                 const struct net_device *orig_dev,
 538                 const struct switchdev_notifier_fdb_info *fdb_info,
 539                 bool (*check_cb)(const struct net_device *dev),
 540                 bool (*foreign_dev_check_cb)(const struct net_device *dev,
 541                                              const struct net_device *foreign_dev),
 542                 int (*del_cb)(struct net_device *dev,
 543                               const struct net_device *orig_dev, const void *ctx,
 544                               const struct switchdev_notifier_fdb_info *fdb_info),
 545                 int (*lag_del_cb)(struct net_device *dev,
 546                                   const struct net_device *orig_dev, const void *ctx,
 547                                   const struct switchdev_notifier_fdb_info *fdb_info))
 548 {
 549         const struct switchdev_notifier_info *info = &fdb_info->info;
 550         struct net_device *br, *lower_dev;
 551         struct list_head *iter;
 552         int err = -EOPNOTSUPP;
 553
 554         if (check_cb(dev))
 555                 return del_cb(dev, orig_dev, info->ctx, fdb_info);
 556
 557         if (netif_is_lag_master(dev)) {
 558                 if (!switchdev_lower_dev_find(dev, check_cb, foreign_dev_check_cb))
 559                         goto maybe_bridged_with_us;
 560
 561                 /* This is a LAG interface that we offload */
 562                 if (!lag_del_cb)
 563                         return -EOPNOTSUPP;
 564
 565                 return lag_del_cb(dev, orig_dev, info->ctx, fdb_info);
 566         }
 567
 568         /* Recurse through lower interfaces in case the FDB entry is pointing
 569          * towards a bridge device.
 570          */
 571         if (netif_is_bridge_master(dev)) {
 572                 if (!switchdev_lower_dev_find(dev, check_cb, foreign_dev_check_cb))
 573                         return 0;
 574
 575                 /* This is a bridge interface that we offload */
 576                 netdev_for_each_lower_dev(dev, lower_dev, iter) {
 577                         /* Do not propagate FDB entries across bridges */
 578                         if (netif_is_bridge_master(lower_dev))
 579                                 continue;
 580
 581                         /* Bridge ports might be either us, or LAG interfaces
 582                          * that we offload.
 583                          */
 584                         if (!check_cb(lower_dev) &&
 585                             !switchdev_lower_dev_find(lower_dev, check_cb,
 586                                                       foreign_dev_check_cb))
 587                                 continue;
 588
 589                         err = __switchdev_handle_fdb_del_to_device(lower_dev, orig_dev,
 590                                                                    fdb_info, check_cb,
 591                                                                    foreign_dev_check_cb,
 592                                                                    del_cb, lag_del_cb);
 593                         if (err && err != -EOPNOTSUPP)
 594                                 return err;
 595                 }
 596
 597                 return 0;
 598         }
 599
 600 maybe_bridged_with_us:
 601         /* Event is neither on a bridge nor a LAG. Check whether it is on an
 602          * interface that is in a bridge with us.
 603          */
 604         br = netdev_master_upper_dev_get_rcu(dev);
 605         if (!br || !netif_is_bridge_master(br))
 606                 return 0;
 607
 608         if (!switchdev_lower_dev_find(br, check_cb, foreign_dev_check_cb))
 609                 return 0;
 610
 611         return __switchdev_handle_fdb_del_to_device(br, orig_dev, fdb_info,
 612                                                     check_cb, foreign_dev_check_cb,
 613                                                     del_cb, lag_del_cb);
 614 }
 615
 616 int switchdev_handle_fdb_del_to_device(struct net_device *dev,
 617                 const struct switchdev_notifier_fdb_info *fdb_info,
 618                 bool (*check_cb)(const struct net_device *dev),
 619                 bool (*foreign_dev_check_cb)(const struct net_device *dev,
 620                                              const struct net_device *foreign_dev),
 621                 int (*del_cb)(struct net_device *dev,
 622                               const struct net_device *orig_dev, const void *ctx,
 623                               const struct switchdev_notifier_fdb_info *fdb_info),
 624                 int (*lag_del_cb)(struct net_device *dev,
 625                                   const struct net_device *orig_dev, const void *ctx,
 626                                   const struct switchdev_notifier_fdb_info *fdb_info))
 627 {
 628         int err;
 629
 630         err = __switchdev_handle_fdb_del_to_device(dev, dev, fdb_info,
 631                                                    check_cb,
 632                                                    foreign_dev_check_cb,
 633                                                    del_cb, lag_del_cb);
 634         if (err == -EOPNOTSUPP)
 635                 err = 0;
 636
 637         return err;
 638 }
 639 EXPORT_SYMBOL_GPL(switchdev_handle_fdb_del_to_device);
 640
 641 static int __switchdev_handle_port_obj_add(struct net_device *dev,
 642                         struct switchdev_notifier_port_obj_info *port_obj_info,
 643                         bool (*check_cb)(const struct net_device *dev),
 644                         int (*add_cb)(struct net_device *dev, const void *ctx,
 645                                       const struct switchdev_obj *obj,
 646                                       struct netlink_ext_ack *extack))
 647 {
 648         struct switchdev_notifier_info *info = &port_obj_info->info;
 649         struct netlink_ext_ack *extack;
 650         struct net_device *lower_dev;
 651         struct list_head *iter;
 652         int err = -EOPNOTSUPP;
 653
 654         extack = switchdev_notifier_info_to_extack(info);
 655
 656         if (check_cb(dev)) {
 657                 err = add_cb(dev, info->ctx, port_obj_info->obj, extack);
 658                 if (err != -EOPNOTSUPP)
 659                         port_obj_info->handled = true;
 660                 return err;
 661         }
 662
 663         /* Switch ports might be stacked under e.g. a LAG. Ignore the
 664          * unsupported devices, another driver might be able to handle them. But
 665          * propagate to the callers any hard errors.
 666          *
 667          * If the driver does its own bookkeeping of stacked ports, it's not
 668          * necessary to go through this helper.
 669          */
 670         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 671                 if (netif_is_bridge_master(lower_dev))
 672                         continue;
 673
 674                 err = __switchdev_handle_port_obj_add(lower_dev, port_obj_info,
 675                                                       check_cb, add_cb);
 676                 if (err && err != -EOPNOTSUPP)
 677                         return err;
 678         }
 679
 680         return err;
 681 }
 682
 683 int switchdev_handle_port_obj_add(struct net_device *dev,
 684                         struct switchdev_notifier_port_obj_info *port_obj_info,
 685                         bool (*check_cb)(const struct net_device *dev),
 686                         int (*add_cb)(struct net_device *dev, const void *ctx,
 687                                       const struct switchdev_obj *obj,
 688                                       struct netlink_ext_ack *extack))
 689 {
 690         int err;
 691
 692         err = __switchdev_handle_port_obj_add(dev, port_obj_info, check_cb,
 693                                               add_cb);
 694         if (err == -EOPNOTSUPP)
 695                 err = 0;
 696         return err;
 697 }
 698 EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_add);
 699
 700 static int __switchdev_handle_port_obj_del(struct net_device *dev,
 701                         struct switchdev_notifier_port_obj_info *port_obj_info,
 702                         bool (*check_cb)(const struct net_device *dev),
 703                         int (*del_cb)(struct net_device *dev, const void *ctx,
 704                                       const struct switchdev_obj *obj))
 705 {
 706         struct switchdev_notifier_info *info = &port_obj_info->info;
 707         struct net_device *lower_dev;
 708         struct list_head *iter;
 709         int err = -EOPNOTSUPP;
 710
 711         if (check_cb(dev)) {
 712                 err = del_cb(dev, info->ctx, port_obj_info->obj);
 713                 if (err != -EOPNOTSUPP)
 714                         port_obj_info->handled = true;
 715                 return err;
 716         }
 717
 718         /* Switch ports might be stacked under e.g. a LAG. Ignore the
 719          * unsupported devices, another driver might be able to handle them. But
 720          * propagate to the callers any hard errors.
 721          *
 722          * If the driver does its own bookkeeping of stacked ports, it's not
 723          * necessary to go through this helper.
 724          */
 725         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 726                 if (netif_is_bridge_master(lower_dev))
 727                         continue;
 728
 729                 err = __switchdev_handle_port_obj_del(lower_dev, port_obj_info,
 730                                                       check_cb, del_cb);
 731                 if (err && err != -EOPNOTSUPP)
 732                         return err;
 733         }
 734
 735         return err;
 736 }
 737
 738 int switchdev_handle_port_obj_del(struct net_device *dev,
 739                         struct switchdev_notifier_port_obj_info *port_obj_info,
 740                         bool (*check_cb)(const struct net_device *dev),
 741                         int (*del_cb)(struct net_device *dev, const void *ctx,
 742                                       const struct switchdev_obj *obj))
 743 {
 744         int err;
 745
 746         err = __switchdev_handle_port_obj_del(dev, port_obj_info, check_cb,
 747                                               del_cb);
 748         if (err == -EOPNOTSUPP)
 749                 err = 0;
 750         return err;
 751 }
 752 EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_del);
 753
 754 static int __switchdev_handle_port_attr_set(struct net_device *dev,
 755                         struct switchdev_notifier_port_attr_info *port_attr_info,
 756                         bool (*check_cb)(const struct net_device *dev),
 757                         int (*set_cb)(struct net_device *dev, const void *ctx,
 758                                       const struct switchdev_attr *attr,
 759                                       struct netlink_ext_ack *extack))
 760 {
 761         struct switchdev_notifier_info *info = &port_attr_info->info;
 762         struct netlink_ext_ack *extack;
 763         struct net_device *lower_dev;
 764         struct list_head *iter;
 765         int err = -EOPNOTSUPP;
 766
 767         extack = switchdev_notifier_info_to_extack(info);
 768
 769         if (check_cb(dev)) {
 770                 err = set_cb(dev, info->ctx, port_attr_info->attr, extack);
 771                 if (err != -EOPNOTSUPP)
 772                         port_attr_info->handled = true;
 773                 return err;
 774         }
 775
 776         /* Switch ports might be stacked under e.g. a LAG. Ignore the
 777          * unsupported devices, another driver might be able to handle them. But
 778          * propagate to the callers any hard errors.
 779          *
 780          * If the driver does its own bookkeeping of stacked ports, it's not
 781          * necessary to go through this helper.
 782          */
 783         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 784                 if (netif_is_bridge_master(lower_dev))
 785                         continue;
 786
 787                 err = __switchdev_handle_port_attr_set(lower_dev, port_attr_info,
 788                                                        check_cb, set_cb);
 789                 if (err && err != -EOPNOTSUPP)
 790                         return err;
 791         }
 792
 793         return err;
 794 }
 795
 796 int switchdev_handle_port_attr_set(struct net_device *dev,
 797                         struct switchdev_notifier_port_attr_info *port_attr_info,
 798                         bool (*check_cb)(const struct net_device *dev),
 799                         int (*set_cb)(struct net_device *dev, const void *ctx,
 800                                       const struct switchdev_attr *attr,
 801                                       struct netlink_ext_ack *extack))
 802 {
 803         int err;
 804
 805         err = __switchdev_handle_port_attr_set(dev, port_attr_info, check_cb,
 806                                                set_cb);
 807         if (err == -EOPNOTSUPP)
 808                 err = 0;
 809         return err;
 810 }
 811 EXPORT_SYMBOL_GPL(switchdev_handle_port_attr_set);
 812
 813 int switchdev_bridge_port_offload(struct net_device *brport_dev,
 814                                   struct net_device *dev, const void *ctx,
 815                                   struct notifier_block *atomic_nb,
 816                                   struct notifier_block *blocking_nb,
 817                                   bool tx_fwd_offload,
 818                                   struct netlink_ext_ack *extack)
 819 {
 820         struct switchdev_notifier_brport_info brport_info = {
 821                 .brport = {
 822                         .dev = dev,
 823                         .ctx = ctx,
 824                         .atomic_nb = atomic_nb,
 825                         .blocking_nb = blocking_nb,
 826                         .tx_fwd_offload = tx_fwd_offload,
 827                 },
 828         };
 829         int err;
 830
 831         ASSERT_RTNL();
 832
 833         err = call_switchdev_blocking_notifiers(SWITCHDEV_BRPORT_OFFLOADED,
 834                                                 brport_dev, &brport_info.info,
 835                                                 extack);
 836         return notifier_to_errno(err);
 837 }
 838 EXPORT_SYMBOL_GPL(switchdev_bridge_port_offload);
 839
 840 void switchdev_bridge_port_unoffload(struct net_device *brport_dev,
 841                                      const void *ctx,
 842                                      struct notifier_block *atomic_nb,
 843                                      struct notifier_block *blocking_nb)
 844 {
 845         struct switchdev_notifier_brport_info brport_info = {
 846                 .brport = {
 847                         .ctx = ctx,
 848                         .atomic_nb = atomic_nb,
 849                         .blocking_nb = blocking_nb,
 850                 },
 851         };
 852
 853         ASSERT_RTNL();
 854
 855         call_switchdev_blocking_notifiers(SWITCHDEV_BRPORT_UNOFFLOADED,
 856                                           brport_dev, &brport_info.info,
 857                                           NULL);
 858 }
 859 EXPORT_SYMBOL_GPL(switchdev_bridge_port_unoffload);