net/switchdev/switchdev.c

   1 /*
   2  * net/switchdev/switchdev.c - Switch device API
   3  * Copyright (c) 2014-2015 Jiri Pirko <jiri@resnulli.us>
   4  * Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/init.h>
  15 #include <linux/mutex.h>
  16 #include <linux/notifier.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/if_bridge.h>
  20 #include <linux/list.h>
  21 #include <linux/workqueue.h>
  22 #include <linux/if_vlan.h>
  23 #include <linux/rtnetlink.h>
  24 #include <net/ip_fib.h>
  25 #include <net/switchdev.h>
  26
  27 /**
  28  *      switchdev_trans_item_enqueue - Enqueue data item to transaction queue
  29  *
  30  *      @trans: transaction
  31  *      @data: pointer to data being queued
  32  *      @destructor: data destructor
  33  *      @tritem: transaction item being queued
  34  *
  35  *      Enqeueue data item to transaction queue. tritem is typically placed in
  36  *      cointainter pointed at by data pointer. Destructor is called on
  37  *      transaction abort and after successful commit phase in case
  38  *      the caller did not dequeue the item before.
  39  */
  40 void switchdev_trans_item_enqueue(struct switchdev_trans *trans,
  41                                   void *data, void (*destructor)(void const *),
  42                                   struct switchdev_trans_item *tritem)
  43 {
  44         tritem->data = data;
  45         tritem->destructor = destructor;
  46         list_add_tail(&tritem->list, &trans->item_list);
  47 }
  48 EXPORT_SYMBOL_GPL(switchdev_trans_item_enqueue);
  49
  50 static struct switchdev_trans_item *
  51 __switchdev_trans_item_dequeue(struct switchdev_trans *trans)
  52 {
  53         struct switchdev_trans_item *tritem;
  54
  55         if (list_empty(&trans->item_list))
  56                 return NULL;
  57         tritem = list_first_entry(&trans->item_list,
  58                                   struct switchdev_trans_item, list);
  59         list_del(&tritem->list);
  60         return tritem;
  61 }
  62
  63 /**
  64  *      switchdev_trans_item_dequeue - Dequeue data item from transaction queue
  65  *
  66  *      @trans: transaction
  67  */
  68 void *switchdev_trans_item_dequeue(struct switchdev_trans *trans)
  69 {
  70         struct switchdev_trans_item *tritem;
  71
  72         tritem = __switchdev_trans_item_dequeue(trans);
  73         BUG_ON(!tritem);
  74         return tritem->data;
  75 }
  76 EXPORT_SYMBOL_GPL(switchdev_trans_item_dequeue);
  77
  78 static void switchdev_trans_init(struct switchdev_trans *trans)
  79 {
  80         INIT_LIST_HEAD(&trans->item_list);
  81 }
  82
  83 static void switchdev_trans_items_destroy(struct switchdev_trans *trans)
  84 {
  85         struct switchdev_trans_item *tritem;
  86
  87         while ((tritem = __switchdev_trans_item_dequeue(trans)))
  88                 tritem->destructor(tritem->data);
  89 }
  90
  91 static void switchdev_trans_items_warn_destroy(struct net_device *dev,
  92                                                struct switchdev_trans *trans)
  93 {
  94         WARN(!list_empty(&trans->item_list), "%s: transaction item queue is not empty.\n",
  95              dev->name);
  96         switchdev_trans_items_destroy(trans);
  97 }
  98
  99 static LIST_HEAD(deferred);
 100 static DEFINE_SPINLOCK(deferred_lock);
 101
 102 typedef void switchdev_deferred_func_t(struct net_device *dev,
 103                                        const void *data);
 104
 105 struct switchdev_deferred_item {
 106         struct list_head list;
 107         struct net_device *dev;
 108         switchdev_deferred_func_t *func;
 109         unsigned long data[0];
 110 };
 111
 112 static struct switchdev_deferred_item *switchdev_deferred_dequeue(void)
 113 {
 114         struct switchdev_deferred_item *dfitem;
 115
 116         spin_lock_bh(&deferred_lock);
 117         if (list_empty(&deferred)) {
 118                 dfitem = NULL;
 119                 goto unlock;
 120         }
 121         dfitem = list_first_entry(&deferred,
 122                                   struct switchdev_deferred_item, list);
 123         list_del(&dfitem->list);
 124 unlock:
 125         spin_unlock_bh(&deferred_lock);
 126         return dfitem;
 127 }
 128
 129 /**
 130  *      switchdev_deferred_process - Process ops in deferred queue
 131  *
 132  *      Called to flush the ops currently queued in deferred ops queue.
 133  *      rtnl_lock must be held.
 134  */
 135 void switchdev_deferred_process(void)
 136 {
 137         struct switchdev_deferred_item *dfitem;
 138
 139         ASSERT_RTNL();
 140
 141         while ((dfitem = switchdev_deferred_dequeue())) {
 142                 dfitem->func(dfitem->dev, dfitem->data);
 143                 dev_put(dfitem->dev);
 144                 kfree(dfitem);
 145         }
 146 }
 147 EXPORT_SYMBOL_GPL(switchdev_deferred_process);
 148
 149 static void switchdev_deferred_process_work(struct work_struct *work)
 150 {
 151         rtnl_lock();
 152         switchdev_deferred_process();
 153         rtnl_unlock();
 154 }
 155
 156 static DECLARE_WORK(deferred_process_work, switchdev_deferred_process_work);
 157
 158 static int switchdev_deferred_enqueue(struct net_device *dev,
 159                                       const void *data, size_t data_len,
 160                                       switchdev_deferred_func_t *func)
 161 {
 162         struct switchdev_deferred_item *dfitem;
 163
 164         dfitem = kmalloc(sizeof(*dfitem) + data_len, GFP_ATOMIC);
 165         if (!dfitem)
 166                 return -ENOMEM;
 167         dfitem->dev = dev;
 168         dfitem->func = func;
 169         memcpy(dfitem->data, data, data_len);
 170         dev_hold(dev);
 171         spin_lock_bh(&deferred_lock);
 172         list_add_tail(&dfitem->list, &deferred);
 173         spin_unlock_bh(&deferred_lock);
 174         schedule_work(&deferred_process_work);
 175         return 0;
 176 }
 177
 178 /**
 179  *      switchdev_port_attr_get - Get port attribute
 180  *
 181  *      @dev: port device
 182  *      @attr: attribute to get
 183  */
 184 int switchdev_port_attr_get(struct net_device *dev, struct switchdev_attr *attr)
 185 {
 186         const struct switchdev_ops *ops = dev->switchdev_ops;
 187         struct net_device *lower_dev;
 188         struct list_head *iter;
 189         struct switchdev_attr first = {
 190                 .id = SWITCHDEV_ATTR_ID_UNDEFINED
 191         };
 192         int err = -EOPNOTSUPP;
 193
 194         if (ops && ops->switchdev_port_attr_get)
 195                 return ops->switchdev_port_attr_get(dev, attr);
 196
 197         if (attr->flags & SWITCHDEV_F_NO_RECURSE)
 198                 return err;
 199
 200         /* Switch device port(s) may be stacked under
 201          * bond/team/vlan dev, so recurse down to get attr on
 202          * each port.  Return -ENODATA if attr values don't
 203          * compare across ports.
 204          */
 205
 206         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 207                 err = switchdev_port_attr_get(lower_dev, attr);
 208                 if (err)
 209                         break;
 210                 if (first.id == SWITCHDEV_ATTR_ID_UNDEFINED)
 211                         first = *attr;
 212                 else if (memcmp(&first, attr, sizeof(*attr)))
 213                         return -ENODATA;
 214         }
 215
 216         return err;
 217 }
 218 EXPORT_SYMBOL_GPL(switchdev_port_attr_get);
 219
 220 static int __switchdev_port_attr_set(struct net_device *dev,
 221                                      const struct switchdev_attr *attr,
 222                                      struct switchdev_trans *trans)
 223 {
 224         const struct switchdev_ops *ops = dev->switchdev_ops;
 225         struct net_device *lower_dev;
 226         struct list_head *iter;
 227         int err = -EOPNOTSUPP;
 228
 229         if (ops && ops->switchdev_port_attr_set) {
 230                 err = ops->switchdev_port_attr_set(dev, attr, trans);
 231                 goto done;
 232         }
 233
 234         if (attr->flags & SWITCHDEV_F_NO_RECURSE)
 235                 goto done;
 236
 237         /* Switch device port(s) may be stacked under
 238          * bond/team/vlan dev, so recurse down to set attr on
 239          * each port.
 240          */
 241
 242         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 243                 err = __switchdev_port_attr_set(lower_dev, attr, trans);
 244                 if (err)
 245                         break;
 246         }
 247
 248 done:
 249         if (err == -EOPNOTSUPP && attr->flags & SWITCHDEV_F_SKIP_EOPNOTSUPP)
 250                 err = 0;
 251
 252         return err;
 253 }
 254
 255 static int switchdev_port_attr_set_now(struct net_device *dev,
 256                                        const struct switchdev_attr *attr)
 257 {
 258         struct switchdev_trans trans;
 259         int err;
 260
 261         switchdev_trans_init(&trans);
 262
 263         /* Phase I: prepare for attr set. Driver/device should fail
 264          * here if there are going to be issues in the commit phase,
 265          * such as lack of resources or support.  The driver/device
 266          * should reserve resources needed for the commit phase here,
 267          * but should not commit the attr.
 268          */
 269
 270         trans.ph_prepare = true;
 271         err = __switchdev_port_attr_set(dev, attr, &trans);
 272         if (err) {
 273                 /* Prepare phase failed: abort the transaction.  Any
 274                  * resources reserved in the prepare phase are
 275                  * released.
 276                  */
 277
 278                 if (err != -EOPNOTSUPP)
 279                         switchdev_trans_items_destroy(&trans);
 280
 281                 return err;
 282         }
 283
 284         /* Phase II: commit attr set.  This cannot fail as a fault
 285          * of driver/device.  If it does, it's a bug in the driver/device
 286          * because the driver said everythings was OK in phase I.
 287          */
 288
 289         trans.ph_prepare = false;
 290         err = __switchdev_port_attr_set(dev, attr, &trans);
 291         WARN(err, "%s: Commit of attribute (id=%d) failed.\n",
 292              dev->name, attr->id);
 293         switchdev_trans_items_warn_destroy(dev, &trans);
 294
 295         return err;
 296 }
 297
 298 static void switchdev_port_attr_set_deferred(struct net_device *dev,
 299                                              const void *data)
 300 {
 301         const struct switchdev_attr *attr = data;
 302         int err;
 303
 304         err = switchdev_port_attr_set_now(dev, attr);
 305         if (err && err != -EOPNOTSUPP)
 306                 netdev_err(dev, "failed (err=%d) to set attribute (id=%d)\n",
 307                            err, attr->id);
 308 }
 309
 310 static int switchdev_port_attr_set_defer(struct net_device *dev,
 311                                          const struct switchdev_attr *attr)
 312 {
 313         return switchdev_deferred_enqueue(dev, attr, sizeof(*attr),
 314                                           switchdev_port_attr_set_deferred);
 315 }
 316
 317 /**
 318  *      switchdev_port_attr_set - Set port attribute
 319  *
 320  *      @dev: port device
 321  *      @attr: attribute to set
 322  *
 323  *      Use a 2-phase prepare-commit transaction model to ensure
 324  *      system is not left in a partially updated state due to
 325  *      failure from driver/device.
 326  *
 327  *      rtnl_lock must be held and must not be in atomic section,
 328  *      in case SWITCHDEV_F_DEFER flag is not set.
 329  */
 330 int switchdev_port_attr_set(struct net_device *dev,
 331                             const struct switchdev_attr *attr)
 332 {
 333         if (attr->flags & SWITCHDEV_F_DEFER)
 334                 return switchdev_port_attr_set_defer(dev, attr);
 335         ASSERT_RTNL();
 336         return switchdev_port_attr_set_now(dev, attr);
 337 }
 338 EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
 339
 340 static size_t switchdev_obj_size(const struct switchdev_obj *obj)
 341 {
 342         switch (obj->id) {
 343         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 344                 return sizeof(struct switchdev_obj_port_vlan);
 345         case SWITCHDEV_OBJ_ID_IPV4_FIB:
 346                 return sizeof(struct switchdev_obj_ipv4_fib);
 347         case SWITCHDEV_OBJ_ID_PORT_FDB:
 348                 return sizeof(struct switchdev_obj_port_fdb);
 349         case SWITCHDEV_OBJ_ID_PORT_MDB:
 350                 return sizeof(struct switchdev_obj_port_mdb);
 351         default:
 352                 BUG();
 353         }
 354         return 0;
 355 }
 356
 357 static int __switchdev_port_obj_add(struct net_device *dev,
 358                                     const struct switchdev_obj *obj,
 359                                     struct switchdev_trans *trans)
 360 {
 361         const struct switchdev_ops *ops = dev->switchdev_ops;
 362         struct net_device *lower_dev;
 363         struct list_head *iter;
 364         int err = -EOPNOTSUPP;
 365
 366         if (ops && ops->switchdev_port_obj_add)
 367                 return ops->switchdev_port_obj_add(dev, obj, trans);
 368
 369         /* Switch device port(s) may be stacked under
 370          * bond/team/vlan dev, so recurse down to add object on
 371          * each port.
 372          */
 373
 374         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 375                 err = __switchdev_port_obj_add(lower_dev, obj, trans);
 376                 if (err)
 377                         break;
 378         }
 379
 380         return err;
 381 }
 382
 383 static int switchdev_port_obj_add_now(struct net_device *dev,
 384                                       const struct switchdev_obj *obj)
 385 {
 386         struct switchdev_trans trans;
 387         int err;
 388
 389         ASSERT_RTNL();
 390
 391         switchdev_trans_init(&trans);
 392
 393         /* Phase I: prepare for obj add. Driver/device should fail
 394          * here if there are going to be issues in the commit phase,
 395          * such as lack of resources or support.  The driver/device
 396          * should reserve resources needed for the commit phase here,
 397          * but should not commit the obj.
 398          */
 399
 400         trans.ph_prepare = true;
 401         err = __switchdev_port_obj_add(dev, obj, &trans);
 402         if (err) {
 403                 /* Prepare phase failed: abort the transaction.  Any
 404                  * resources reserved in the prepare phase are
 405                  * released.
 406                  */
 407
 408                 if (err != -EOPNOTSUPP)
 409                         switchdev_trans_items_destroy(&trans);
 410
 411                 return err;
 412         }
 413
 414         /* Phase II: commit obj add.  This cannot fail as a fault
 415          * of driver/device.  If it does, it's a bug in the driver/device
 416          * because the driver said everythings was OK in phase I.
 417          */
 418
 419         trans.ph_prepare = false;
 420         err = __switchdev_port_obj_add(dev, obj, &trans);
 421         WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id);
 422         switchdev_trans_items_warn_destroy(dev, &trans);
 423
 424         return err;
 425 }
 426
 427 static void switchdev_port_obj_add_deferred(struct net_device *dev,
 428                                             const void *data)
 429 {
 430         const struct switchdev_obj *obj = data;
 431         int err;
 432
 433         err = switchdev_port_obj_add_now(dev, obj);
 434         if (err && err != -EOPNOTSUPP)
 435                 netdev_err(dev, "failed (err=%d) to add object (id=%d)\n",
 436                            err, obj->id);
 437 }
 438
 439 static int switchdev_port_obj_add_defer(struct net_device *dev,
 440                                         const struct switchdev_obj *obj)
 441 {
 442         return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
 443                                           switchdev_port_obj_add_deferred);
 444 }
 445
 446 /**
 447  *      switchdev_port_obj_add - Add port object
 448  *
 449  *      @dev: port device
 450  *      @id: object ID
 451  *      @obj: object to add
 452  *
 453  *      Use a 2-phase prepare-commit transaction model to ensure
 454  *      system is not left in a partially updated state due to
 455  *      failure from driver/device.
 456  *
 457  *      rtnl_lock must be held and must not be in atomic section,
 458  *      in case SWITCHDEV_F_DEFER flag is not set.
 459  */
 460 int switchdev_port_obj_add(struct net_device *dev,
 461                            const struct switchdev_obj *obj)
 462 {
 463         if (obj->flags & SWITCHDEV_F_DEFER)
 464                 return switchdev_port_obj_add_defer(dev, obj);
 465         ASSERT_RTNL();
 466         return switchdev_port_obj_add_now(dev, obj);
 467 }
 468 EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
 469
 470 static int switchdev_port_obj_del_now(struct net_device *dev,
 471                                       const struct switchdev_obj *obj)
 472 {
 473         const struct switchdev_ops *ops = dev->switchdev_ops;
 474         struct net_device *lower_dev;
 475         struct list_head *iter;
 476         int err = -EOPNOTSUPP;
 477
 478         if (ops && ops->switchdev_port_obj_del)
 479                 return ops->switchdev_port_obj_del(dev, obj);
 480
 481         /* Switch device port(s) may be stacked under
 482          * bond/team/vlan dev, so recurse down to delete object on
 483          * each port.
 484          */
 485
 486         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 487                 err = switchdev_port_obj_del_now(lower_dev, obj);
 488                 if (err)
 489                         break;
 490         }
 491
 492         return err;
 493 }
 494
 495 static void switchdev_port_obj_del_deferred(struct net_device *dev,
 496                                             const void *data)
 497 {
 498         const struct switchdev_obj *obj = data;
 499         int err;
 500
 501         err = switchdev_port_obj_del_now(dev, obj);
 502         if (err && err != -EOPNOTSUPP)
 503                 netdev_err(dev, "failed (err=%d) to del object (id=%d)\n",
 504                            err, obj->id);
 505 }
 506
 507 static int switchdev_port_obj_del_defer(struct net_device *dev,
 508                                         const struct switchdev_obj *obj)
 509 {
 510         return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
 511                                           switchdev_port_obj_del_deferred);
 512 }
 513
 514 /**
 515  *      switchdev_port_obj_del - Delete port object
 516  *
 517  *      @dev: port device
 518  *      @id: object ID
 519  *      @obj: object to delete
 520  *
 521  *      rtnl_lock must be held and must not be in atomic section,
 522  *      in case SWITCHDEV_F_DEFER flag is not set.
 523  */
 524 int switchdev_port_obj_del(struct net_device *dev,
 525                            const struct switchdev_obj *obj)
 526 {
 527         if (obj->flags & SWITCHDEV_F_DEFER)
 528                 return switchdev_port_obj_del_defer(dev, obj);
 529         ASSERT_RTNL();
 530         return switchdev_port_obj_del_now(dev, obj);
 531 }
 532 EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
 533
 534 /**
 535  *      switchdev_port_obj_dump - Dump port objects
 536  *
 537  *      @dev: port device
 538  *      @id: object ID
 539  *      @obj: object to dump
 540  *      @cb: function to call with a filled object
 541  *
 542  *      rtnl_lock must be held.
 543  */
 544 int switchdev_port_obj_dump(struct net_device *dev, struct switchdev_obj *obj,
 545                             switchdev_obj_dump_cb_t *cb)
 546 {
 547         const struct switchdev_ops *ops = dev->switchdev_ops;
 548         struct net_device *lower_dev;
 549         struct list_head *iter;
 550         int err = -EOPNOTSUPP;
 551
 552         ASSERT_RTNL();
 553
 554         if (ops && ops->switchdev_port_obj_dump)
 555                 return ops->switchdev_port_obj_dump(dev, obj, cb);
 556
 557         /* Switch device port(s) may be stacked under
 558          * bond/team/vlan dev, so recurse down to dump objects on
 559          * first port at bottom of stack.
 560          */
 561
 562         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 563                 err = switchdev_port_obj_dump(lower_dev, obj, cb);
 564                 break;
 565         }
 566
 567         return err;
 568 }
 569 EXPORT_SYMBOL_GPL(switchdev_port_obj_dump);
 570
 571 static RAW_NOTIFIER_HEAD(switchdev_notif_chain);
 572
 573 /**
 574  *      register_switchdev_notifier - Register notifier
 575  *      @nb: notifier_block
 576  *
 577  *      Register switch device notifier. This should be used by code
 578  *      which needs to monitor events happening in particular device.
 579  *      Return values are same as for atomic_notifier_chain_register().
 580  */
 581 int register_switchdev_notifier(struct notifier_block *nb)
 582 {
 583         int err;
 584
 585         rtnl_lock();
 586         err = raw_notifier_chain_register(&switchdev_notif_chain, nb);
 587         rtnl_unlock();
 588         return err;
 589 }
 590 EXPORT_SYMBOL_GPL(register_switchdev_notifier);
 591
 592 /**
 593  *      unregister_switchdev_notifier - Unregister notifier
 594  *      @nb: notifier_block
 595  *
 596  *      Unregister switch device notifier.
 597  *      Return values are same as for atomic_notifier_chain_unregister().
 598  */
 599 int unregister_switchdev_notifier(struct notifier_block *nb)
 600 {
 601         int err;
 602
 603         rtnl_lock();
 604         err = raw_notifier_chain_unregister(&switchdev_notif_chain, nb);
 605         rtnl_unlock();
 606         return err;
 607 }
 608 EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
 609
 610 /**
 611  *      call_switchdev_notifiers - Call notifiers
 612  *      @val: value passed unmodified to notifier function
 613  *      @dev: port device
 614  *      @info: notifier information data
 615  *
 616  *      Call all network notifier blocks. This should be called by driver
 617  *      when it needs to propagate hardware event.
 618  *      Return values are same as for atomic_notifier_call_chain().
 619  *      rtnl_lock must be held.
 620  */
 621 int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
 622                              struct switchdev_notifier_info *info)
 623 {
 624         int err;
 625
 626         ASSERT_RTNL();
 627
 628         info->dev = dev;
 629         err = raw_notifier_call_chain(&switchdev_notif_chain, val, info);
 630         return err;
 631 }
 632 EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
 633
 634 struct switchdev_vlan_dump {
 635         struct switchdev_obj_port_vlan vlan;
 636         struct sk_buff *skb;
 637         u32 filter_mask;
 638         u16 flags;
 639         u16 begin;
 640         u16 end;
 641 };
 642
 643 static int switchdev_port_vlan_dump_put(struct switchdev_vlan_dump *dump)
 644 {
 645         struct bridge_vlan_info vinfo;
 646
 647         vinfo.flags = dump->flags;
 648
 649         if (dump->begin == 0 && dump->end == 0) {
 650                 return 0;
 651         } else if (dump->begin == dump->end) {
 652                 vinfo.vid = dump->begin;
 653                 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
 654                             sizeof(vinfo), &vinfo))
 655                         return -EMSGSIZE;
 656         } else {
 657                 vinfo.vid = dump->begin;
 658                 vinfo.flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN;
 659                 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
 660                             sizeof(vinfo), &vinfo))
 661                         return -EMSGSIZE;
 662                 vinfo.vid = dump->end;
 663                 vinfo.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;
 664                 vinfo.flags |= BRIDGE_VLAN_INFO_RANGE_END;
 665                 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
 666                             sizeof(vinfo), &vinfo))
 667                         return -EMSGSIZE;
 668         }
 669
 670         return 0;
 671 }
 672
 673 static int switchdev_port_vlan_dump_cb(struct switchdev_obj *obj)
 674 {
 675         struct switchdev_obj_port_vlan *vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 676         struct switchdev_vlan_dump *dump =
 677                 container_of(vlan, struct switchdev_vlan_dump, vlan);
 678         int err = 0;
 679
 680         if (vlan->vid_begin > vlan->vid_end)
 681                 return -EINVAL;
 682
 683         if (dump->filter_mask & RTEXT_FILTER_BRVLAN) {
 684                 dump->flags = vlan->flags;
 685                 for (dump->begin = dump->end = vlan->vid_begin;
 686                      dump->begin <= vlan->vid_end;
 687                      dump->begin++, dump->end++) {
 688                         err = switchdev_port_vlan_dump_put(dump);
 689                         if (err)
 690                                 return err;
 691                 }
 692         } else if (dump->filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) {
 693                 if (dump->begin > vlan->vid_begin &&
 694                     dump->begin >= vlan->vid_end) {
 695                         if ((dump->begin - 1) == vlan->vid_end &&
 696                             dump->flags == vlan->flags) {
 697                                 /* prepend */
 698                                 dump->begin = vlan->vid_begin;
 699                         } else {
 700                                 err = switchdev_port_vlan_dump_put(dump);
 701                                 dump->flags = vlan->flags;
 702                                 dump->begin = vlan->vid_begin;
 703                                 dump->end = vlan->vid_end;
 704                         }
 705                 } else if (dump->end <= vlan->vid_begin &&
 706                            dump->end < vlan->vid_end) {
 707                         if ((dump->end  + 1) == vlan->vid_begin &&
 708                             dump->flags == vlan->flags) {
 709                                 /* append */
 710                                 dump->end = vlan->vid_end;
 711                         } else {
 712                                 err = switchdev_port_vlan_dump_put(dump);
 713                                 dump->flags = vlan->flags;
 714                                 dump->begin = vlan->vid_begin;
 715                                 dump->end = vlan->vid_end;
 716                         }
 717                 } else {
 718                         err = -EINVAL;
 719                 }
 720         }
 721
 722         return err;
 723 }
 724
 725 static int switchdev_port_vlan_fill(struct sk_buff *skb, struct net_device *dev,
 726                                     u32 filter_mask)
 727 {
 728         struct switchdev_vlan_dump dump = {
 729                 .vlan.obj.orig_dev = dev,
 730                 .vlan.obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
 731                 .skb = skb,
 732                 .filter_mask = filter_mask,
 733         };
 734         int err = 0;
 735
 736         if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
 737             (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
 738                 err = switchdev_port_obj_dump(dev, &dump.vlan.obj,
 739                                               switchdev_port_vlan_dump_cb);
 740                 if (err)
 741                         goto err_out;
 742                 if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
 743                         /* last one */
 744                         err = switchdev_port_vlan_dump_put(&dump);
 745         }
 746
 747 err_out:
 748         return err == -EOPNOTSUPP ? 0 : err;
 749 }
 750
 751 /**
 752  *      switchdev_port_bridge_getlink - Get bridge port attributes
 753  *
 754  *      @dev: port device
 755  *
 756  *      Called for SELF on rtnl_bridge_getlink to get bridge port
 757  *      attributes.
 758  */
 759 int switchdev_port_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 760                                   struct net_device *dev, u32 filter_mask,
 761                                   int nlflags)
 762 {
 763         struct switchdev_attr attr = {
 764                 .orig_dev = dev,
 765                 .id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
 766         };
 767         u16 mode = BRIDGE_MODE_UNDEF;
 768         u32 mask = BR_LEARNING | BR_LEARNING_SYNC | BR_FLOOD;
 769         int err;
 770
 771         err = switchdev_port_attr_get(dev, &attr);
 772         if (err && err != -EOPNOTSUPP)
 773                 return err;
 774
 775         return ndo_dflt_bridge_getlink(skb, pid, seq, dev, mode,
 776                                        attr.u.brport_flags, mask, nlflags,
 777                                        filter_mask, switchdev_port_vlan_fill);
 778 }
 779 EXPORT_SYMBOL_GPL(switchdev_port_bridge_getlink);
 780
 781 static int switchdev_port_br_setflag(struct net_device *dev,
 782                                      struct nlattr *nlattr,
 783                                      unsigned long brport_flag)
 784 {
 785         struct switchdev_attr attr = {
 786                 .orig_dev = dev,
 787                 .id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
 788         };
 789         u8 flag = nla_get_u8(nlattr);
 790         int err;
 791
 792         err = switchdev_port_attr_get(dev, &attr);
 793         if (err)
 794                 return err;
 795
 796         if (flag)
 797                 attr.u.brport_flags |= brport_flag;
 798         else
 799                 attr.u.brport_flags &= ~brport_flag;
 800
 801         return switchdev_port_attr_set(dev, &attr);
 802 }
 803
 804 static const struct nla_policy
 805 switchdev_port_bridge_policy[IFLA_BRPORT_MAX + 1] = {
 806         [IFLA_BRPORT_STATE]             = { .type = NLA_U8 },
 807         [IFLA_BRPORT_COST]              = { .type = NLA_U32 },
 808         [IFLA_BRPORT_PRIORITY]          = { .type = NLA_U16 },
 809         [IFLA_BRPORT_MODE]              = { .type = NLA_U8 },
 810         [IFLA_BRPORT_GUARD]             = { .type = NLA_U8 },
 811         [IFLA_BRPORT_PROTECT]           = { .type = NLA_U8 },
 812         [IFLA_BRPORT_FAST_LEAVE]        = { .type = NLA_U8 },
 813         [IFLA_BRPORT_LEARNING]          = { .type = NLA_U8 },
 814         [IFLA_BRPORT_LEARNING_SYNC]     = { .type = NLA_U8 },
 815         [IFLA_BRPORT_UNICAST_FLOOD]     = { .type = NLA_U8 },
 816 };
 817
 818 static int switchdev_port_br_setlink_protinfo(struct net_device *dev,
 819                                               struct nlattr *protinfo)
 820 {
 821         struct nlattr *attr;
 822         int rem;
 823         int err;
 824
 825         err = nla_validate_nested(protinfo, IFLA_BRPORT_MAX,
 826                                   switchdev_port_bridge_policy);
 827         if (err)
 828                 return err;
 829
 830         nla_for_each_nested(attr, protinfo, rem) {
 831                 switch (nla_type(attr)) {
 832                 case IFLA_BRPORT_LEARNING:
 833                         err = switchdev_port_br_setflag(dev, attr,
 834                                                         BR_LEARNING);
 835                         break;
 836                 case IFLA_BRPORT_LEARNING_SYNC:
 837                         err = switchdev_port_br_setflag(dev, attr,
 838                                                         BR_LEARNING_SYNC);
 839                         break;
 840                 case IFLA_BRPORT_UNICAST_FLOOD:
 841                         err = switchdev_port_br_setflag(dev, attr, BR_FLOOD);
 842                         break;
 843                 default:
 844                         err = -EOPNOTSUPP;
 845                         break;
 846                 }
 847                 if (err)
 848                         return err;
 849         }
 850
 851         return 0;
 852 }
 853
 854 static int switchdev_port_br_afspec(struct net_device *dev,
 855                                     struct nlattr *afspec,
 856                                     int (*f)(struct net_device *dev,
 857                                              const struct switchdev_obj *obj))
 858 {
 859         struct nlattr *attr;
 860         struct bridge_vlan_info *vinfo;
 861         struct switchdev_obj_port_vlan vlan = {
 862                 .obj.orig_dev = dev,
 863                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
 864         };
 865         int rem;
 866         int err;
 867
 868         nla_for_each_nested(attr, afspec, rem) {
 869                 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
 870                         continue;
 871                 if (nla_len(attr) != sizeof(struct bridge_vlan_info))
 872                         return -EINVAL;
 873                 vinfo = nla_data(attr);
 874                 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
 875                         return -EINVAL;
 876                 vlan.flags = vinfo->flags;
 877                 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 878                         if (vlan.vid_begin)
 879                                 return -EINVAL;
 880                         vlan.vid_begin = vinfo->vid;
 881                         /* don't allow range of pvids */
 882                         if (vlan.flags & BRIDGE_VLAN_INFO_PVID)
 883                                 return -EINVAL;
 884                 } else if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END) {
 885                         if (!vlan.vid_begin)
 886                                 return -EINVAL;
 887                         vlan.vid_end = vinfo->vid;
 888                         if (vlan.vid_end <= vlan.vid_begin)
 889                                 return -EINVAL;
 890                         err = f(dev, &vlan.obj);
 891                         if (err)
 892                                 return err;
 893                         vlan.vid_begin = 0;
 894                 } else {
 895                         if (vlan.vid_begin)
 896                                 return -EINVAL;
 897                         vlan.vid_begin = vinfo->vid;
 898                         vlan.vid_end = vinfo->vid;
 899                         err = f(dev, &vlan.obj);
 900                         if (err)
 901                                 return err;
 902                         vlan.vid_begin = 0;
 903                 }
 904         }
 905
 906         return 0;
 907 }
 908
 909 /**
 910  *      switchdev_port_bridge_setlink - Set bridge port attributes
 911  *
 912  *      @dev: port device
 913  *      @nlh: netlink header
 914  *      @flags: netlink flags
 915  *
 916  *      Called for SELF on rtnl_bridge_setlink to set bridge port
 917  *      attributes.
 918  */
 919 int switchdev_port_bridge_setlink(struct net_device *dev,
 920                                   struct nlmsghdr *nlh, u16 flags)
 921 {
 922         struct nlattr *protinfo;
 923         struct nlattr *afspec;
 924         int err = 0;
 925
 926         protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
 927                                    IFLA_PROTINFO);
 928         if (protinfo) {
 929                 err = switchdev_port_br_setlink_protinfo(dev, protinfo);
 930                 if (err)
 931                         return err;
 932         }
 933
 934         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
 935                                  IFLA_AF_SPEC);
 936         if (afspec)
 937                 err = switchdev_port_br_afspec(dev, afspec,
 938                                                switchdev_port_obj_add);
 939
 940         return err;
 941 }
 942 EXPORT_SYMBOL_GPL(switchdev_port_bridge_setlink);
 943
 944 /**
 945  *      switchdev_port_bridge_dellink - Set bridge port attributes
 946  *
 947  *      @dev: port device
 948  *      @nlh: netlink header
 949  *      @flags: netlink flags
 950  *
 951  *      Called for SELF on rtnl_bridge_dellink to set bridge port
 952  *      attributes.
 953  */
 954 int switchdev_port_bridge_dellink(struct net_device *dev,
 955                                   struct nlmsghdr *nlh, u16 flags)
 956 {
 957         struct nlattr *afspec;
 958
 959         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
 960                                  IFLA_AF_SPEC);
 961         if (afspec)
 962                 return switchdev_port_br_afspec(dev, afspec,
 963                                                 switchdev_port_obj_del);
 964
 965         return 0;
 966 }
 967 EXPORT_SYMBOL_GPL(switchdev_port_bridge_dellink);
 968
 969 /**
 970  *      switchdev_port_fdb_add - Add FDB (MAC/VLAN) entry to port
 971  *
 972  *      @ndmsg: netlink hdr
 973  *      @nlattr: netlink attributes
 974  *      @dev: port device
 975  *      @addr: MAC address to add
 976  *      @vid: VLAN to add
 977  *
 978  *      Add FDB entry to switch device.
 979  */
 980 int switchdev_port_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 981                            struct net_device *dev, const unsigned char *addr,
 982                            u16 vid, u16 nlm_flags)
 983 {
 984         struct switchdev_obj_port_fdb fdb = {
 985                 .obj.orig_dev = dev,
 986                 .obj.id = SWITCHDEV_OBJ_ID_PORT_FDB,
 987                 .vid = vid,
 988         };
 989
 990         ether_addr_copy(fdb.addr, addr);
 991         return switchdev_port_obj_add(dev, &fdb.obj);
 992 }
 993 EXPORT_SYMBOL_GPL(switchdev_port_fdb_add);
 994
 995 /**
 996  *      switchdev_port_fdb_del - Delete FDB (MAC/VLAN) entry from port
 997  *
 998  *      @ndmsg: netlink hdr
 999  *      @nlattr: netlink attributes
1000  *      @dev: port device
1001  *      @addr: MAC address to delete
1002  *      @vid: VLAN to delete
1003  *
1004  *      Delete FDB entry from switch device.
1005  */
1006 int switchdev_port_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1007                            struct net_device *dev, const unsigned char *addr,
1008                            u16 vid)
1009 {
1010         struct switchdev_obj_port_fdb fdb = {
1011                 .obj.orig_dev = dev,
1012                 .obj.id = SWITCHDEV_OBJ_ID_PORT_FDB,
1013                 .vid = vid,
1014         };
1015
1016         ether_addr_copy(fdb.addr, addr);
1017         return switchdev_port_obj_del(dev, &fdb.obj);
1018 }
1019 EXPORT_SYMBOL_GPL(switchdev_port_fdb_del);
1020
1021 struct switchdev_fdb_dump {
1022         struct switchdev_obj_port_fdb fdb;
1023         struct net_device *dev;
1024         struct sk_buff *skb;
1025         struct netlink_callback *cb;
1026         int idx;
1027 };
1028
1029 static int switchdev_port_fdb_dump_cb(struct switchdev_obj *obj)
1030 {
1031         struct switchdev_obj_port_fdb *fdb = SWITCHDEV_OBJ_PORT_FDB(obj);
1032         struct switchdev_fdb_dump *dump =
1033                 container_of(fdb, struct switchdev_fdb_dump, fdb);
1034         u32 portid = NETLINK_CB(dump->cb->skb).portid;
1035         u32 seq = dump->cb->nlh->nlmsg_seq;
1036         struct nlmsghdr *nlh;
1037         struct ndmsg *ndm;
1038
1039         if (dump->idx < dump->cb->args[0])
1040                 goto skip;
1041
1042         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
1043                         sizeof(*ndm), NLM_F_MULTI);
1044         if (!nlh)
1045                 return -EMSGSIZE;
1046
1047         ndm = nlmsg_data(nlh);
1048         ndm->ndm_family  = AF_BRIDGE;
1049         ndm->ndm_pad1    = 0;
1050         ndm->ndm_pad2    = 0;
1051         ndm->ndm_flags   = NTF_SELF;
1052         ndm->ndm_type    = 0;
1053         ndm->ndm_ifindex = dump->dev->ifindex;
1054         ndm->ndm_state   = fdb->ndm_state;
1055
1056         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, fdb->addr))
1057                 goto nla_put_failure;
1058
1059         if (fdb->vid && nla_put_u16(dump->skb, NDA_VLAN, fdb->vid))
1060                 goto nla_put_failure;
1061
1062         nlmsg_end(dump->skb, nlh);
1063
1064 skip:
1065         dump->idx++;
1066         return 0;
1067
1068 nla_put_failure:
1069         nlmsg_cancel(dump->skb, nlh);
1070         return -EMSGSIZE;
1071 }
1072
1073 /**
1074  *      switchdev_port_fdb_dump - Dump port FDB (MAC/VLAN) entries
1075  *
1076  *      @skb: netlink skb
1077  *      @cb: netlink callback
1078  *      @dev: port device
1079  *      @filter_dev: filter device
1080  *      @idx:
1081  *
1082  *      Delete FDB entry from switch device.
1083  */
1084 int switchdev_port_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1085                             struct net_device *dev,
1086                             struct net_device *filter_dev, int idx)
1087 {
1088         struct switchdev_fdb_dump dump = {
1089                 .fdb.obj.orig_dev = dev,
1090                 .fdb.obj.id = SWITCHDEV_OBJ_ID_PORT_FDB,
1091                 .dev = dev,
1092                 .skb = skb,
1093                 .cb = cb,
1094                 .idx = idx,
1095         };
1096
1097         switchdev_port_obj_dump(dev, &dump.fdb.obj, switchdev_port_fdb_dump_cb);
1098         return dump.idx;
1099 }
1100 EXPORT_SYMBOL_GPL(switchdev_port_fdb_dump);
1101
1102 static struct net_device *switchdev_get_lowest_dev(struct net_device *dev)
1103 {
1104         const struct switchdev_ops *ops = dev->switchdev_ops;
1105         struct net_device *lower_dev;
1106         struct net_device *port_dev;
1107         struct list_head *iter;
1108
1109         /* Recusively search down until we find a sw port dev.
1110          * (A sw port dev supports switchdev_port_attr_get).
1111          */
1112
1113         if (ops && ops->switchdev_port_attr_get)
1114                 return dev;
1115
1116         netdev_for_each_lower_dev(dev, lower_dev, iter) {
1117                 port_dev = switchdev_get_lowest_dev(lower_dev);
1118                 if (port_dev)
1119                         return port_dev;
1120         }
1121
1122         return NULL;
1123 }
1124
1125 static struct net_device *switchdev_get_dev_by_nhs(struct fib_info *fi)
1126 {
1127         struct switchdev_attr attr = {
1128                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1129         };
1130         struct switchdev_attr prev_attr;
1131         struct net_device *dev = NULL;
1132         int nhsel;
1133
1134         ASSERT_RTNL();
1135
1136         /* For this route, all nexthop devs must be on the same switch. */
1137
1138         for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
1139                 const struct fib_nh *nh = &fi->fib_nh[nhsel];
1140
1141                 if (!nh->nh_dev)
1142                         return NULL;
1143
1144                 dev = switchdev_get_lowest_dev(nh->nh_dev);
1145                 if (!dev)
1146                         return NULL;
1147
1148                 attr.orig_dev = dev;
1149                 if (switchdev_port_attr_get(dev, &attr))
1150                         return NULL;
1151
1152                 if (nhsel > 0 &&
1153                     !netdev_phys_item_id_same(&prev_attr.u.ppid, &attr.u.ppid))
1154                                 return NULL;
1155
1156                 prev_attr = attr;
1157         }
1158
1159         return dev;
1160 }
1161
1162 /**
1163  *      switchdev_fib_ipv4_add - Add/modify switch IPv4 route entry
1164  *
1165  *      @dst: route's IPv4 destination address
1166  *      @dst_len: destination address length (prefix length)
1167  *      @fi: route FIB info structure
1168  *      @tos: route TOS
1169  *      @type: route type
1170  *      @nlflags: netlink flags passed in (NLM_F_*)
1171  *      @tb_id: route table ID
1172  *
1173  *      Add/modify switch IPv4 route entry.
1174  */
1175 int switchdev_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
1176                            u8 tos, u8 type, u32 nlflags, u32 tb_id)
1177 {
1178         struct switchdev_obj_ipv4_fib ipv4_fib = {
1179                 .obj.id = SWITCHDEV_OBJ_ID_IPV4_FIB,
1180                 .dst = dst,
1181                 .dst_len = dst_len,
1182                 .tos = tos,
1183                 .type = type,
1184                 .nlflags = nlflags,
1185                 .tb_id = tb_id,
1186         };
1187         struct net_device *dev;
1188         int err = 0;
1189
1190         memcpy(&ipv4_fib.fi, fi, sizeof(ipv4_fib.fi));
1191
1192         /* Don't offload route if using custom ip rules or if
1193          * IPv4 FIB offloading has been disabled completely.
1194          */
1195
1196 #ifdef CONFIG_IP_MULTIPLE_TABLES
1197         if (fi->fib_net->ipv4.fib_has_custom_rules)
1198                 return 0;
1199 #endif
1200
1201         if (fi->fib_net->ipv4.fib_offload_disabled)
1202                 return 0;
1203
1204         dev = switchdev_get_dev_by_nhs(fi);
1205         if (!dev)
1206                 return 0;
1207
1208         ipv4_fib.obj.orig_dev = dev;
1209         err = switchdev_port_obj_add(dev, &ipv4_fib.obj);
1210         if (!err)
1211                 fi->fib_flags |= RTNH_F_OFFLOAD;
1212
1213         return err == -EOPNOTSUPP ? 0 : err;
1214 }
1215 EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_add);
1216
1217 /**
1218  *      switchdev_fib_ipv4_del - Delete IPv4 route entry from switch
1219  *
1220  *      @dst: route's IPv4 destination address
1221  *      @dst_len: destination address length (prefix length)
1222  *      @fi: route FIB info structure
1223  *      @tos: route TOS
1224  *      @type: route type
1225  *      @tb_id: route table ID
1226  *
1227  *      Delete IPv4 route entry from switch device.
1228  */
1229 int switchdev_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
1230                            u8 tos, u8 type, u32 tb_id)
1231 {
1232         struct switchdev_obj_ipv4_fib ipv4_fib = {
1233                 .obj.id = SWITCHDEV_OBJ_ID_IPV4_FIB,
1234                 .dst = dst,
1235                 .dst_len = dst_len,
1236                 .tos = tos,
1237                 .type = type,
1238                 .nlflags = 0,
1239                 .tb_id = tb_id,
1240         };
1241         struct net_device *dev;
1242         int err = 0;
1243
1244         memcpy(&ipv4_fib.fi, fi, sizeof(ipv4_fib.fi));
1245
1246         if (!(fi->fib_flags & RTNH_F_OFFLOAD))
1247                 return 0;
1248
1249         dev = switchdev_get_dev_by_nhs(fi);
1250         if (!dev)
1251                 return 0;
1252
1253         ipv4_fib.obj.orig_dev = dev;
1254         err = switchdev_port_obj_del(dev, &ipv4_fib.obj);
1255         if (!err)
1256                 fi->fib_flags &= ~RTNH_F_OFFLOAD;
1257
1258         return err == -EOPNOTSUPP ? 0 : err;
1259 }
1260 EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_del);
1261
1262 /**
1263  *      switchdev_fib_ipv4_abort - Abort an IPv4 FIB operation
1264  *
1265  *      @fi: route FIB info structure
1266  */
1267 void switchdev_fib_ipv4_abort(struct fib_info *fi)
1268 {
1269         /* There was a problem installing this route to the offload
1270          * device.  For now, until we come up with more refined
1271          * policy handling, abruptly end IPv4 fib offloading for
1272          * for entire net by flushing offload device(s) of all
1273          * IPv4 routes, and mark IPv4 fib offloading broken from
1274          * this point forward.
1275          */
1276
1277         fib_flush_external(fi->fib_net);
1278         fi->fib_net->ipv4.fib_offload_disabled = true;
1279 }
1280 EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_abort);
1281
1282 static bool switchdev_port_same_parent_id(struct net_device *a,
1283                                           struct net_device *b)
1284 {
1285         struct switchdev_attr a_attr = {
1286                 .orig_dev = a,
1287                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1288                 .flags = SWITCHDEV_F_NO_RECURSE,
1289         };
1290         struct switchdev_attr b_attr = {
1291                 .orig_dev = b,
1292                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1293                 .flags = SWITCHDEV_F_NO_RECURSE,
1294         };
1295
1296         if (switchdev_port_attr_get(a, &a_attr) ||
1297             switchdev_port_attr_get(b, &b_attr))
1298                 return false;
1299
1300         return netdev_phys_item_id_same(&a_attr.u.ppid, &b_attr.u.ppid);
1301 }
1302
1303 static u32 switchdev_port_fwd_mark_get(struct net_device *dev,
1304                                        struct net_device *group_dev)
1305 {
1306         struct net_device *lower_dev;
1307         struct list_head *iter;
1308
1309         netdev_for_each_lower_dev(group_dev, lower_dev, iter) {
1310                 if (lower_dev == dev)
1311                         continue;
1312                 if (switchdev_port_same_parent_id(dev, lower_dev))
1313                         return lower_dev->offload_fwd_mark;
1314                 return switchdev_port_fwd_mark_get(dev, lower_dev);
1315         }
1316
1317         return dev->ifindex;
1318 }
1319
1320 static void switchdev_port_fwd_mark_reset(struct net_device *group_dev,
1321                                           u32 old_mark, u32 *reset_mark)
1322 {
1323         struct net_device *lower_dev;
1324         struct list_head *iter;
1325
1326         netdev_for_each_lower_dev(group_dev, lower_dev, iter) {
1327                 if (lower_dev->offload_fwd_mark == old_mark) {
1328                         if (!*reset_mark)
1329                                 *reset_mark = lower_dev->ifindex;
1330                         lower_dev->offload_fwd_mark = *reset_mark;
1331                 }
1332                 switchdev_port_fwd_mark_reset(lower_dev, old_mark, reset_mark);
1333         }
1334 }
1335
1336 /**
1337  *      switchdev_port_fwd_mark_set - Set port offload forwarding mark
1338  *
1339  *      @dev: port device
1340  *      @group_dev: containing device
1341  *      @joining: true if dev is joining group; false if leaving group
1342  *
1343  *      An ungrouped port's offload mark is just its ifindex.  A grouped
1344  *      port's (member of a bridge, for example) offload mark is the ifindex
1345  *      of one of the ports in the group with the same parent (switch) ID.
1346  *      Ports on the same device in the same group will have the same mark.
1347  *
1348  *      Example:
1349  *
1350  *              br0             ifindex=9
1351  *                sw1p1         ifindex=2       mark=2
1352  *                sw1p2         ifindex=3       mark=2
1353  *                sw2p1         ifindex=4       mark=5
1354  *                sw2p2         ifindex=5       mark=5
1355  *
1356  *      If sw2p2 leaves the bridge, we'll have:
1357  *
1358  *              br0             ifindex=9
1359  *                sw1p1         ifindex=2       mark=2
1360  *                sw1p2         ifindex=3       mark=2
1361  *                sw2p1         ifindex=4       mark=4
1362  *              sw2p2           ifindex=5       mark=5
1363  */
1364 void switchdev_port_fwd_mark_set(struct net_device *dev,
1365                                  struct net_device *group_dev,
1366                                  bool joining)
1367 {
1368         u32 mark = dev->ifindex;
1369         u32 reset_mark = 0;
1370
1371         if (group_dev) {
1372                 ASSERT_RTNL();
1373                 if (joining)
1374                         mark = switchdev_port_fwd_mark_get(dev, group_dev);
1375                 else if (dev->offload_fwd_mark == mark)
1376                         /* Ohoh, this port was the mark reference port,
1377                          * but it's leaving the group, so reset the
1378                          * mark for the remaining ports in the group.
1379                          */
1380                         switchdev_port_fwd_mark_reset(group_dev, mark,
1381                                                       &reset_mark);
1382         }
1383
1384         dev->offload_fwd_mark = mark;
1385 }
1386 EXPORT_SYMBOL_GPL(switchdev_port_fwd_mark_set);