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         if (attr->complete)
 309                 attr->complete(dev, err, attr->complete_priv);
 310 }
 311
 312 static int switchdev_port_attr_set_defer(struct net_device *dev,
 313                                          const struct switchdev_attr *attr)
 314 {
 315         return switchdev_deferred_enqueue(dev, attr, sizeof(*attr),
 316                                           switchdev_port_attr_set_deferred);
 317 }
 318
 319 /**
 320  *      switchdev_port_attr_set - Set port attribute
 321  *
 322  *      @dev: port device
 323  *      @attr: attribute to set
 324  *
 325  *      Use a 2-phase prepare-commit transaction model to ensure
 326  *      system is not left in a partially updated state due to
 327  *      failure from driver/device.
 328  *
 329  *      rtnl_lock must be held and must not be in atomic section,
 330  *      in case SWITCHDEV_F_DEFER flag is not set.
 331  */
 332 int switchdev_port_attr_set(struct net_device *dev,
 333                             const struct switchdev_attr *attr)
 334 {
 335         if (attr->flags & SWITCHDEV_F_DEFER)
 336                 return switchdev_port_attr_set_defer(dev, attr);
 337         ASSERT_RTNL();
 338         return switchdev_port_attr_set_now(dev, attr);
 339 }
 340 EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
 341
 342 static size_t switchdev_obj_size(const struct switchdev_obj *obj)
 343 {
 344         switch (obj->id) {
 345         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 346                 return sizeof(struct switchdev_obj_port_vlan);
 347         case SWITCHDEV_OBJ_ID_IPV4_FIB:
 348                 return sizeof(struct switchdev_obj_ipv4_fib);
 349         case SWITCHDEV_OBJ_ID_PORT_FDB:
 350                 return sizeof(struct switchdev_obj_port_fdb);
 351         case SWITCHDEV_OBJ_ID_PORT_MDB:
 352                 return sizeof(struct switchdev_obj_port_mdb);
 353         default:
 354                 BUG();
 355         }
 356         return 0;
 357 }
 358
 359 static int __switchdev_port_obj_add(struct net_device *dev,
 360                                     const struct switchdev_obj *obj,
 361                                     struct switchdev_trans *trans)
 362 {
 363         const struct switchdev_ops *ops = dev->switchdev_ops;
 364         struct net_device *lower_dev;
 365         struct list_head *iter;
 366         int err = -EOPNOTSUPP;
 367
 368         if (ops && ops->switchdev_port_obj_add)
 369                 return ops->switchdev_port_obj_add(dev, obj, trans);
 370
 371         /* Switch device port(s) may be stacked under
 372          * bond/team/vlan dev, so recurse down to add object on
 373          * each port.
 374          */
 375
 376         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 377                 err = __switchdev_port_obj_add(lower_dev, obj, trans);
 378                 if (err)
 379                         break;
 380         }
 381
 382         return err;
 383 }
 384
 385 static int switchdev_port_obj_add_now(struct net_device *dev,
 386                                       const struct switchdev_obj *obj)
 387 {
 388         struct switchdev_trans trans;
 389         int err;
 390
 391         ASSERT_RTNL();
 392
 393         switchdev_trans_init(&trans);
 394
 395         /* Phase I: prepare for obj add. Driver/device should fail
 396          * here if there are going to be issues in the commit phase,
 397          * such as lack of resources or support.  The driver/device
 398          * should reserve resources needed for the commit phase here,
 399          * but should not commit the obj.
 400          */
 401
 402         trans.ph_prepare = true;
 403         err = __switchdev_port_obj_add(dev, obj, &trans);
 404         if (err) {
 405                 /* Prepare phase failed: abort the transaction.  Any
 406                  * resources reserved in the prepare phase are
 407                  * released.
 408                  */
 409
 410                 if (err != -EOPNOTSUPP)
 411                         switchdev_trans_items_destroy(&trans);
 412
 413                 return err;
 414         }
 415
 416         /* Phase II: commit obj add.  This cannot fail as a fault
 417          * of driver/device.  If it does, it's a bug in the driver/device
 418          * because the driver said everythings was OK in phase I.
 419          */
 420
 421         trans.ph_prepare = false;
 422         err = __switchdev_port_obj_add(dev, obj, &trans);
 423         WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id);
 424         switchdev_trans_items_warn_destroy(dev, &trans);
 425
 426         return err;
 427 }
 428
 429 static void switchdev_port_obj_add_deferred(struct net_device *dev,
 430                                             const void *data)
 431 {
 432         const struct switchdev_obj *obj = data;
 433         int err;
 434
 435         err = switchdev_port_obj_add_now(dev, obj);
 436         if (err && err != -EOPNOTSUPP)
 437                 netdev_err(dev, "failed (err=%d) to add object (id=%d)\n",
 438                            err, obj->id);
 439         if (obj->complete)
 440                 obj->complete(dev, err, obj->complete_priv);
 441 }
 442
 443 static int switchdev_port_obj_add_defer(struct net_device *dev,
 444                                         const struct switchdev_obj *obj)
 445 {
 446         return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
 447                                           switchdev_port_obj_add_deferred);
 448 }
 449
 450 /**
 451  *      switchdev_port_obj_add - Add port object
 452  *
 453  *      @dev: port device
 454  *      @id: object ID
 455  *      @obj: object to add
 456  *
 457  *      Use a 2-phase prepare-commit transaction model to ensure
 458  *      system is not left in a partially updated state due to
 459  *      failure from driver/device.
 460  *
 461  *      rtnl_lock must be held and must not be in atomic section,
 462  *      in case SWITCHDEV_F_DEFER flag is not set.
 463  */
 464 int switchdev_port_obj_add(struct net_device *dev,
 465                            const struct switchdev_obj *obj)
 466 {
 467         if (obj->flags & SWITCHDEV_F_DEFER)
 468                 return switchdev_port_obj_add_defer(dev, obj);
 469         ASSERT_RTNL();
 470         return switchdev_port_obj_add_now(dev, obj);
 471 }
 472 EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
 473
 474 static int switchdev_port_obj_del_now(struct net_device *dev,
 475                                       const struct switchdev_obj *obj)
 476 {
 477         const struct switchdev_ops *ops = dev->switchdev_ops;
 478         struct net_device *lower_dev;
 479         struct list_head *iter;
 480         int err = -EOPNOTSUPP;
 481
 482         if (ops && ops->switchdev_port_obj_del)
 483                 return ops->switchdev_port_obj_del(dev, obj);
 484
 485         /* Switch device port(s) may be stacked under
 486          * bond/team/vlan dev, so recurse down to delete object on
 487          * each port.
 488          */
 489
 490         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 491                 err = switchdev_port_obj_del_now(lower_dev, obj);
 492                 if (err)
 493                         break;
 494         }
 495
 496         return err;
 497 }
 498
 499 static void switchdev_port_obj_del_deferred(struct net_device *dev,
 500                                             const void *data)
 501 {
 502         const struct switchdev_obj *obj = data;
 503         int err;
 504
 505         err = switchdev_port_obj_del_now(dev, obj);
 506         if (err && err != -EOPNOTSUPP)
 507                 netdev_err(dev, "failed (err=%d) to del object (id=%d)\n",
 508                            err, obj->id);
 509         if (obj->complete)
 510                 obj->complete(dev, err, obj->complete_priv);
 511 }
 512
 513 static int switchdev_port_obj_del_defer(struct net_device *dev,
 514                                         const struct switchdev_obj *obj)
 515 {
 516         return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
 517                                           switchdev_port_obj_del_deferred);
 518 }
 519
 520 /**
 521  *      switchdev_port_obj_del - Delete port object
 522  *
 523  *      @dev: port device
 524  *      @id: object ID
 525  *      @obj: object to delete
 526  *
 527  *      rtnl_lock must be held and must not be in atomic section,
 528  *      in case SWITCHDEV_F_DEFER flag is not set.
 529  */
 530 int switchdev_port_obj_del(struct net_device *dev,
 531                            const struct switchdev_obj *obj)
 532 {
 533         if (obj->flags & SWITCHDEV_F_DEFER)
 534                 return switchdev_port_obj_del_defer(dev, obj);
 535         ASSERT_RTNL();
 536         return switchdev_port_obj_del_now(dev, obj);
 537 }
 538 EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
 539
 540 /**
 541  *      switchdev_port_obj_dump - Dump port objects
 542  *
 543  *      @dev: port device
 544  *      @id: object ID
 545  *      @obj: object to dump
 546  *      @cb: function to call with a filled object
 547  *
 548  *      rtnl_lock must be held.
 549  */
 550 int switchdev_port_obj_dump(struct net_device *dev, struct switchdev_obj *obj,
 551                             switchdev_obj_dump_cb_t *cb)
 552 {
 553         const struct switchdev_ops *ops = dev->switchdev_ops;
 554         struct net_device *lower_dev;
 555         struct list_head *iter;
 556         int err = -EOPNOTSUPP;
 557
 558         ASSERT_RTNL();
 559
 560         if (ops && ops->switchdev_port_obj_dump)
 561                 return ops->switchdev_port_obj_dump(dev, obj, cb);
 562
 563         /* Switch device port(s) may be stacked under
 564          * bond/team/vlan dev, so recurse down to dump objects on
 565          * first port at bottom of stack.
 566          */
 567
 568         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 569                 err = switchdev_port_obj_dump(lower_dev, obj, cb);
 570                 break;
 571         }
 572
 573         return err;
 574 }
 575 EXPORT_SYMBOL_GPL(switchdev_port_obj_dump);
 576
 577 static RAW_NOTIFIER_HEAD(switchdev_notif_chain);
 578
 579 /**
 580  *      register_switchdev_notifier - Register notifier
 581  *      @nb: notifier_block
 582  *
 583  *      Register switch device notifier. This should be used by code
 584  *      which needs to monitor events happening in particular device.
 585  *      Return values are same as for atomic_notifier_chain_register().
 586  */
 587 int register_switchdev_notifier(struct notifier_block *nb)
 588 {
 589         int err;
 590
 591         rtnl_lock();
 592         err = raw_notifier_chain_register(&switchdev_notif_chain, nb);
 593         rtnl_unlock();
 594         return err;
 595 }
 596 EXPORT_SYMBOL_GPL(register_switchdev_notifier);
 597
 598 /**
 599  *      unregister_switchdev_notifier - Unregister notifier
 600  *      @nb: notifier_block
 601  *
 602  *      Unregister switch device notifier.
 603  *      Return values are same as for atomic_notifier_chain_unregister().
 604  */
 605 int unregister_switchdev_notifier(struct notifier_block *nb)
 606 {
 607         int err;
 608
 609         rtnl_lock();
 610         err = raw_notifier_chain_unregister(&switchdev_notif_chain, nb);
 611         rtnl_unlock();
 612         return err;
 613 }
 614 EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
 615
 616 /**
 617  *      call_switchdev_notifiers - Call notifiers
 618  *      @val: value passed unmodified to notifier function
 619  *      @dev: port device
 620  *      @info: notifier information data
 621  *
 622  *      Call all network notifier blocks. This should be called by driver
 623  *      when it needs to propagate hardware event.
 624  *      Return values are same as for atomic_notifier_call_chain().
 625  *      rtnl_lock must be held.
 626  */
 627 int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
 628                              struct switchdev_notifier_info *info)
 629 {
 630         int err;
 631
 632         ASSERT_RTNL();
 633
 634         info->dev = dev;
 635         err = raw_notifier_call_chain(&switchdev_notif_chain, val, info);
 636         return err;
 637 }
 638 EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
 639
 640 struct switchdev_vlan_dump {
 641         struct switchdev_obj_port_vlan vlan;
 642         struct sk_buff *skb;
 643         u32 filter_mask;
 644         u16 flags;
 645         u16 begin;
 646         u16 end;
 647 };
 648
 649 static int switchdev_port_vlan_dump_put(struct switchdev_vlan_dump *dump)
 650 {
 651         struct bridge_vlan_info vinfo;
 652
 653         vinfo.flags = dump->flags;
 654
 655         if (dump->begin == 0 && dump->end == 0) {
 656                 return 0;
 657         } else if (dump->begin == dump->end) {
 658                 vinfo.vid = dump->begin;
 659                 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
 660                             sizeof(vinfo), &vinfo))
 661                         return -EMSGSIZE;
 662         } else {
 663                 vinfo.vid = dump->begin;
 664                 vinfo.flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN;
 665                 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
 666                             sizeof(vinfo), &vinfo))
 667                         return -EMSGSIZE;
 668                 vinfo.vid = dump->end;
 669                 vinfo.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;
 670                 vinfo.flags |= BRIDGE_VLAN_INFO_RANGE_END;
 671                 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
 672                             sizeof(vinfo), &vinfo))
 673                         return -EMSGSIZE;
 674         }
 675
 676         return 0;
 677 }
 678
 679 static int switchdev_port_vlan_dump_cb(struct switchdev_obj *obj)
 680 {
 681         struct switchdev_obj_port_vlan *vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 682         struct switchdev_vlan_dump *dump =
 683                 container_of(vlan, struct switchdev_vlan_dump, vlan);
 684         int err = 0;
 685
 686         if (vlan->vid_begin > vlan->vid_end)
 687                 return -EINVAL;
 688
 689         if (dump->filter_mask & RTEXT_FILTER_BRVLAN) {
 690                 dump->flags = vlan->flags;
 691                 for (dump->begin = dump->end = vlan->vid_begin;
 692                      dump->begin <= vlan->vid_end;
 693                      dump->begin++, dump->end++) {
 694                         err = switchdev_port_vlan_dump_put(dump);
 695                         if (err)
 696                                 return err;
 697                 }
 698         } else if (dump->filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) {
 699                 if (dump->begin > vlan->vid_begin &&
 700                     dump->begin >= vlan->vid_end) {
 701                         if ((dump->begin - 1) == vlan->vid_end &&
 702                             dump->flags == vlan->flags) {
 703                                 /* prepend */
 704                                 dump->begin = vlan->vid_begin;
 705                         } else {
 706                                 err = switchdev_port_vlan_dump_put(dump);
 707                                 dump->flags = vlan->flags;
 708                                 dump->begin = vlan->vid_begin;
 709                                 dump->end = vlan->vid_end;
 710                         }
 711                 } else if (dump->end <= vlan->vid_begin &&
 712                            dump->end < vlan->vid_end) {
 713                         if ((dump->end  + 1) == vlan->vid_begin &&
 714                             dump->flags == vlan->flags) {
 715                                 /* append */
 716                                 dump->end = vlan->vid_end;
 717                         } else {
 718                                 err = switchdev_port_vlan_dump_put(dump);
 719                                 dump->flags = vlan->flags;
 720                                 dump->begin = vlan->vid_begin;
 721                                 dump->end = vlan->vid_end;
 722                         }
 723                 } else {
 724                         err = -EINVAL;
 725                 }
 726         }
 727
 728         return err;
 729 }
 730
 731 static int switchdev_port_vlan_fill(struct sk_buff *skb, struct net_device *dev,
 732                                     u32 filter_mask)
 733 {
 734         struct switchdev_vlan_dump dump = {
 735                 .vlan.obj.orig_dev = dev,
 736                 .vlan.obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
 737                 .skb = skb,
 738                 .filter_mask = filter_mask,
 739         };
 740         int err = 0;
 741
 742         if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
 743             (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
 744                 err = switchdev_port_obj_dump(dev, &dump.vlan.obj,
 745                                               switchdev_port_vlan_dump_cb);
 746                 if (err)
 747                         goto err_out;
 748                 if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
 749                         /* last one */
 750                         err = switchdev_port_vlan_dump_put(&dump);
 751         }
 752
 753 err_out:
 754         return err == -EOPNOTSUPP ? 0 : err;
 755 }
 756
 757 /**
 758  *      switchdev_port_bridge_getlink - Get bridge port attributes
 759  *
 760  *      @dev: port device
 761  *
 762  *      Called for SELF on rtnl_bridge_getlink to get bridge port
 763  *      attributes.
 764  */
 765 int switchdev_port_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 766                                   struct net_device *dev, u32 filter_mask,
 767                                   int nlflags)
 768 {
 769         struct switchdev_attr attr = {
 770                 .orig_dev = dev,
 771                 .id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
 772         };
 773         u16 mode = BRIDGE_MODE_UNDEF;
 774         u32 mask = BR_LEARNING | BR_LEARNING_SYNC | BR_FLOOD;
 775         int err;
 776
 777         err = switchdev_port_attr_get(dev, &attr);
 778         if (err && err != -EOPNOTSUPP)
 779                 return err;
 780
 781         return ndo_dflt_bridge_getlink(skb, pid, seq, dev, mode,
 782                                        attr.u.brport_flags, mask, nlflags,
 783                                        filter_mask, switchdev_port_vlan_fill);
 784 }
 785 EXPORT_SYMBOL_GPL(switchdev_port_bridge_getlink);
 786
 787 static int switchdev_port_br_setflag(struct net_device *dev,
 788                                      struct nlattr *nlattr,
 789                                      unsigned long brport_flag)
 790 {
 791         struct switchdev_attr attr = {
 792                 .orig_dev = dev,
 793                 .id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
 794         };
 795         u8 flag = nla_get_u8(nlattr);
 796         int err;
 797
 798         err = switchdev_port_attr_get(dev, &attr);
 799         if (err)
 800                 return err;
 801
 802         if (flag)
 803                 attr.u.brport_flags |= brport_flag;
 804         else
 805                 attr.u.brport_flags &= ~brport_flag;
 806
 807         return switchdev_port_attr_set(dev, &attr);
 808 }
 809
 810 static const struct nla_policy
 811 switchdev_port_bridge_policy[IFLA_BRPORT_MAX + 1] = {
 812         [IFLA_BRPORT_STATE]             = { .type = NLA_U8 },
 813         [IFLA_BRPORT_COST]              = { .type = NLA_U32 },
 814         [IFLA_BRPORT_PRIORITY]          = { .type = NLA_U16 },
 815         [IFLA_BRPORT_MODE]              = { .type = NLA_U8 },
 816         [IFLA_BRPORT_GUARD]             = { .type = NLA_U8 },
 817         [IFLA_BRPORT_PROTECT]           = { .type = NLA_U8 },
 818         [IFLA_BRPORT_FAST_LEAVE]        = { .type = NLA_U8 },
 819         [IFLA_BRPORT_LEARNING]          = { .type = NLA_U8 },
 820         [IFLA_BRPORT_LEARNING_SYNC]     = { .type = NLA_U8 },
 821         [IFLA_BRPORT_UNICAST_FLOOD]     = { .type = NLA_U8 },
 822 };
 823
 824 static int switchdev_port_br_setlink_protinfo(struct net_device *dev,
 825                                               struct nlattr *protinfo)
 826 {
 827         struct nlattr *attr;
 828         int rem;
 829         int err;
 830
 831         err = nla_validate_nested(protinfo, IFLA_BRPORT_MAX,
 832                                   switchdev_port_bridge_policy);
 833         if (err)
 834                 return err;
 835
 836         nla_for_each_nested(attr, protinfo, rem) {
 837                 switch (nla_type(attr)) {
 838                 case IFLA_BRPORT_LEARNING:
 839                         err = switchdev_port_br_setflag(dev, attr,
 840                                                         BR_LEARNING);
 841                         break;
 842                 case IFLA_BRPORT_LEARNING_SYNC:
 843                         err = switchdev_port_br_setflag(dev, attr,
 844                                                         BR_LEARNING_SYNC);
 845                         break;
 846                 case IFLA_BRPORT_UNICAST_FLOOD:
 847                         err = switchdev_port_br_setflag(dev, attr, BR_FLOOD);
 848                         break;
 849                 default:
 850                         err = -EOPNOTSUPP;
 851                         break;
 852                 }
 853                 if (err)
 854                         return err;
 855         }
 856
 857         return 0;
 858 }
 859
 860 static int switchdev_port_br_afspec(struct net_device *dev,
 861                                     struct nlattr *afspec,
 862                                     int (*f)(struct net_device *dev,
 863                                              const struct switchdev_obj *obj))
 864 {
 865         struct nlattr *attr;
 866         struct bridge_vlan_info *vinfo;
 867         struct switchdev_obj_port_vlan vlan = {
 868                 .obj.orig_dev = dev,
 869                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
 870         };
 871         int rem;
 872         int err;
 873
 874         nla_for_each_nested(attr, afspec, rem) {
 875                 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
 876                         continue;
 877                 if (nla_len(attr) != sizeof(struct bridge_vlan_info))
 878                         return -EINVAL;
 879                 vinfo = nla_data(attr);
 880                 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
 881                         return -EINVAL;
 882                 vlan.flags = vinfo->flags;
 883                 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 884                         if (vlan.vid_begin)
 885                                 return -EINVAL;
 886                         vlan.vid_begin = vinfo->vid;
 887                         /* don't allow range of pvids */
 888                         if (vlan.flags & BRIDGE_VLAN_INFO_PVID)
 889                                 return -EINVAL;
 890                 } else if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END) {
 891                         if (!vlan.vid_begin)
 892                                 return -EINVAL;
 893                         vlan.vid_end = vinfo->vid;
 894                         if (vlan.vid_end <= vlan.vid_begin)
 895                                 return -EINVAL;
 896                         err = f(dev, &vlan.obj);
 897                         if (err)
 898                                 return err;
 899                         vlan.vid_begin = 0;
 900                 } else {
 901                         if (vlan.vid_begin)
 902                                 return -EINVAL;
 903                         vlan.vid_begin = vinfo->vid;
 904                         vlan.vid_end = vinfo->vid;
 905                         err = f(dev, &vlan.obj);
 906                         if (err)
 907                                 return err;
 908                         vlan.vid_begin = 0;
 909                 }
 910         }
 911
 912         return 0;
 913 }
 914
 915 /**
 916  *      switchdev_port_bridge_setlink - Set bridge port attributes
 917  *
 918  *      @dev: port device
 919  *      @nlh: netlink header
 920  *      @flags: netlink flags
 921  *
 922  *      Called for SELF on rtnl_bridge_setlink to set bridge port
 923  *      attributes.
 924  */
 925 int switchdev_port_bridge_setlink(struct net_device *dev,
 926                                   struct nlmsghdr *nlh, u16 flags)
 927 {
 928         struct nlattr *protinfo;
 929         struct nlattr *afspec;
 930         int err = 0;
 931
 932         protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
 933                                    IFLA_PROTINFO);
 934         if (protinfo) {
 935                 err = switchdev_port_br_setlink_protinfo(dev, protinfo);
 936                 if (err)
 937                         return err;
 938         }
 939
 940         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
 941                                  IFLA_AF_SPEC);
 942         if (afspec)
 943                 err = switchdev_port_br_afspec(dev, afspec,
 944                                                switchdev_port_obj_add);
 945
 946         return err;
 947 }
 948 EXPORT_SYMBOL_GPL(switchdev_port_bridge_setlink);
 949
 950 /**
 951  *      switchdev_port_bridge_dellink - Set bridge port attributes
 952  *
 953  *      @dev: port device
 954  *      @nlh: netlink header
 955  *      @flags: netlink flags
 956  *
 957  *      Called for SELF on rtnl_bridge_dellink to set bridge port
 958  *      attributes.
 959  */
 960 int switchdev_port_bridge_dellink(struct net_device *dev,
 961                                   struct nlmsghdr *nlh, u16 flags)
 962 {
 963         struct nlattr *afspec;
 964
 965         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
 966                                  IFLA_AF_SPEC);
 967         if (afspec)
 968                 return switchdev_port_br_afspec(dev, afspec,
 969                                                 switchdev_port_obj_del);
 970
 971         return 0;
 972 }
 973 EXPORT_SYMBOL_GPL(switchdev_port_bridge_dellink);
 974
 975 /**
 976  *      switchdev_port_fdb_add - Add FDB (MAC/VLAN) entry to port
 977  *
 978  *      @ndmsg: netlink hdr
 979  *      @nlattr: netlink attributes
 980  *      @dev: port device
 981  *      @addr: MAC address to add
 982  *      @vid: VLAN to add
 983  *
 984  *      Add FDB entry to switch device.
 985  */
 986 int switchdev_port_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 987                            struct net_device *dev, const unsigned char *addr,
 988                            u16 vid, u16 nlm_flags)
 989 {
 990         struct switchdev_obj_port_fdb fdb = {
 991                 .obj.orig_dev = dev,
 992                 .obj.id = SWITCHDEV_OBJ_ID_PORT_FDB,
 993                 .vid = vid,
 994         };
 995
 996         ether_addr_copy(fdb.addr, addr);
 997         return switchdev_port_obj_add(dev, &fdb.obj);
 998 }
 999 EXPORT_SYMBOL_GPL(switchdev_port_fdb_add);
1000
1001 /**
1002  *      switchdev_port_fdb_del - Delete FDB (MAC/VLAN) entry from port
1003  *
1004  *      @ndmsg: netlink hdr
1005  *      @nlattr: netlink attributes
1006  *      @dev: port device
1007  *      @addr: MAC address to delete
1008  *      @vid: VLAN to delete
1009  *
1010  *      Delete FDB entry from switch device.
1011  */
1012 int switchdev_port_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1013                            struct net_device *dev, const unsigned char *addr,
1014                            u16 vid)
1015 {
1016         struct switchdev_obj_port_fdb fdb = {
1017                 .obj.orig_dev = dev,
1018                 .obj.id = SWITCHDEV_OBJ_ID_PORT_FDB,
1019                 .vid = vid,
1020         };
1021
1022         ether_addr_copy(fdb.addr, addr);
1023         return switchdev_port_obj_del(dev, &fdb.obj);
1024 }
1025 EXPORT_SYMBOL_GPL(switchdev_port_fdb_del);
1026
1027 struct switchdev_fdb_dump {
1028         struct switchdev_obj_port_fdb fdb;
1029         struct net_device *dev;
1030         struct sk_buff *skb;
1031         struct netlink_callback *cb;
1032         int idx;
1033 };
1034
1035 static int switchdev_port_fdb_dump_cb(struct switchdev_obj *obj)
1036 {
1037         struct switchdev_obj_port_fdb *fdb = SWITCHDEV_OBJ_PORT_FDB(obj);
1038         struct switchdev_fdb_dump *dump =
1039                 container_of(fdb, struct switchdev_fdb_dump, fdb);
1040         u32 portid = NETLINK_CB(dump->cb->skb).portid;
1041         u32 seq = dump->cb->nlh->nlmsg_seq;
1042         struct nlmsghdr *nlh;
1043         struct ndmsg *ndm;
1044
1045         if (dump->idx < dump->cb->args[0])
1046                 goto skip;
1047
1048         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
1049                         sizeof(*ndm), NLM_F_MULTI);
1050         if (!nlh)
1051                 return -EMSGSIZE;
1052
1053         ndm = nlmsg_data(nlh);
1054         ndm->ndm_family  = AF_BRIDGE;
1055         ndm->ndm_pad1    = 0;
1056         ndm->ndm_pad2    = 0;
1057         ndm->ndm_flags   = NTF_SELF;
1058         ndm->ndm_type    = 0;
1059         ndm->ndm_ifindex = dump->dev->ifindex;
1060         ndm->ndm_state   = fdb->ndm_state;
1061
1062         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, fdb->addr))
1063                 goto nla_put_failure;
1064
1065         if (fdb->vid && nla_put_u16(dump->skb, NDA_VLAN, fdb->vid))
1066                 goto nla_put_failure;
1067
1068         nlmsg_end(dump->skb, nlh);
1069
1070 skip:
1071         dump->idx++;
1072         return 0;
1073
1074 nla_put_failure:
1075         nlmsg_cancel(dump->skb, nlh);
1076         return -EMSGSIZE;
1077 }
1078
1079 /**
1080  *      switchdev_port_fdb_dump - Dump port FDB (MAC/VLAN) entries
1081  *
1082  *      @skb: netlink skb
1083  *      @cb: netlink callback
1084  *      @dev: port device
1085  *      @filter_dev: filter device
1086  *      @idx:
1087  *
1088  *      Dump FDB entries from switch device.
1089  */
1090 int switchdev_port_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1091                             struct net_device *dev,
1092                             struct net_device *filter_dev, int idx)
1093 {
1094         struct switchdev_fdb_dump dump = {
1095                 .fdb.obj.orig_dev = dev,
1096                 .fdb.obj.id = SWITCHDEV_OBJ_ID_PORT_FDB,
1097                 .dev = dev,
1098                 .skb = skb,
1099                 .cb = cb,
1100                 .idx = idx,
1101         };
1102         int err;
1103
1104         err = switchdev_port_obj_dump(dev, &dump.fdb.obj,
1105                                       switchdev_port_fdb_dump_cb);
1106         cb->args[1] = err;
1107         return dump.idx;
1108 }
1109 EXPORT_SYMBOL_GPL(switchdev_port_fdb_dump);
1110
1111 static struct net_device *switchdev_get_lowest_dev(struct net_device *dev)
1112 {
1113         const struct switchdev_ops *ops = dev->switchdev_ops;
1114         struct net_device *lower_dev;
1115         struct net_device *port_dev;
1116         struct list_head *iter;
1117
1118         /* Recusively search down until we find a sw port dev.
1119          * (A sw port dev supports switchdev_port_attr_get).
1120          */
1121
1122         if (ops && ops->switchdev_port_attr_get)
1123                 return dev;
1124
1125         netdev_for_each_lower_dev(dev, lower_dev, iter) {
1126                 port_dev = switchdev_get_lowest_dev(lower_dev);
1127                 if (port_dev)
1128                         return port_dev;
1129         }
1130
1131         return NULL;
1132 }
1133
1134 static struct net_device *switchdev_get_dev_by_nhs(struct fib_info *fi)
1135 {
1136         struct switchdev_attr attr = {
1137                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1138         };
1139         struct switchdev_attr prev_attr;
1140         struct net_device *dev = NULL;
1141         int nhsel;
1142
1143         ASSERT_RTNL();
1144
1145         /* For this route, all nexthop devs must be on the same switch. */
1146
1147         for (nhsel = 0; nhsel < fi->fib_nhs; nhsel++) {
1148                 const struct fib_nh *nh = &fi->fib_nh[nhsel];
1149
1150                 if (!nh->nh_dev)
1151                         return NULL;
1152
1153                 dev = switchdev_get_lowest_dev(nh->nh_dev);
1154                 if (!dev)
1155                         return NULL;
1156
1157                 attr.orig_dev = dev;
1158                 if (switchdev_port_attr_get(dev, &attr))
1159                         return NULL;
1160
1161                 if (nhsel > 0 &&
1162                     !netdev_phys_item_id_same(&prev_attr.u.ppid, &attr.u.ppid))
1163                                 return NULL;
1164
1165                 prev_attr = attr;
1166         }
1167
1168         return dev;
1169 }
1170
1171 /**
1172  *      switchdev_fib_ipv4_add - Add/modify switch IPv4 route entry
1173  *
1174  *      @dst: route's IPv4 destination address
1175  *      @dst_len: destination address length (prefix length)
1176  *      @fi: route FIB info structure
1177  *      @tos: route TOS
1178  *      @type: route type
1179  *      @nlflags: netlink flags passed in (NLM_F_*)
1180  *      @tb_id: route table ID
1181  *
1182  *      Add/modify switch IPv4 route entry.
1183  */
1184 int switchdev_fib_ipv4_add(u32 dst, int dst_len, struct fib_info *fi,
1185                            u8 tos, u8 type, u32 nlflags, u32 tb_id)
1186 {
1187         struct switchdev_obj_ipv4_fib ipv4_fib = {
1188                 .obj.id = SWITCHDEV_OBJ_ID_IPV4_FIB,
1189                 .dst = dst,
1190                 .dst_len = dst_len,
1191                 .tos = tos,
1192                 .type = type,
1193                 .nlflags = nlflags,
1194                 .tb_id = tb_id,
1195         };
1196         struct net_device *dev;
1197         int err = 0;
1198
1199         memcpy(&ipv4_fib.fi, fi, sizeof(ipv4_fib.fi));
1200
1201         /* Don't offload route if using custom ip rules or if
1202          * IPv4 FIB offloading has been disabled completely.
1203          */
1204
1205 #ifdef CONFIG_IP_MULTIPLE_TABLES
1206         if (fi->fib_net->ipv4.fib_has_custom_rules)
1207                 return 0;
1208 #endif
1209
1210         if (fi->fib_net->ipv4.fib_offload_disabled)
1211                 return 0;
1212
1213         dev = switchdev_get_dev_by_nhs(fi);
1214         if (!dev)
1215                 return 0;
1216
1217         ipv4_fib.obj.orig_dev = dev;
1218         err = switchdev_port_obj_add(dev, &ipv4_fib.obj);
1219         if (!err)
1220                 fi->fib_flags |= RTNH_F_OFFLOAD;
1221
1222         return err == -EOPNOTSUPP ? 0 : err;
1223 }
1224 EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_add);
1225
1226 /**
1227  *      switchdev_fib_ipv4_del - Delete IPv4 route entry from switch
1228  *
1229  *      @dst: route's IPv4 destination address
1230  *      @dst_len: destination address length (prefix length)
1231  *      @fi: route FIB info structure
1232  *      @tos: route TOS
1233  *      @type: route type
1234  *      @tb_id: route table ID
1235  *
1236  *      Delete IPv4 route entry from switch device.
1237  */
1238 int switchdev_fib_ipv4_del(u32 dst, int dst_len, struct fib_info *fi,
1239                            u8 tos, u8 type, u32 tb_id)
1240 {
1241         struct switchdev_obj_ipv4_fib ipv4_fib = {
1242                 .obj.id = SWITCHDEV_OBJ_ID_IPV4_FIB,
1243                 .dst = dst,
1244                 .dst_len = dst_len,
1245                 .tos = tos,
1246                 .type = type,
1247                 .nlflags = 0,
1248                 .tb_id = tb_id,
1249         };
1250         struct net_device *dev;
1251         int err = 0;
1252
1253         memcpy(&ipv4_fib.fi, fi, sizeof(ipv4_fib.fi));
1254
1255         if (!(fi->fib_flags & RTNH_F_OFFLOAD))
1256                 return 0;
1257
1258         dev = switchdev_get_dev_by_nhs(fi);
1259         if (!dev)
1260                 return 0;
1261
1262         ipv4_fib.obj.orig_dev = dev;
1263         err = switchdev_port_obj_del(dev, &ipv4_fib.obj);
1264         if (!err)
1265                 fi->fib_flags &= ~RTNH_F_OFFLOAD;
1266
1267         return err == -EOPNOTSUPP ? 0 : err;
1268 }
1269 EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_del);
1270
1271 /**
1272  *      switchdev_fib_ipv4_abort - Abort an IPv4 FIB operation
1273  *
1274  *      @fi: route FIB info structure
1275  */
1276 void switchdev_fib_ipv4_abort(struct fib_info *fi)
1277 {
1278         /* There was a problem installing this route to the offload
1279          * device.  For now, until we come up with more refined
1280          * policy handling, abruptly end IPv4 fib offloading for
1281          * for entire net by flushing offload device(s) of all
1282          * IPv4 routes, and mark IPv4 fib offloading broken from
1283          * this point forward.
1284          */
1285
1286         fib_flush_external(fi->fib_net);
1287         fi->fib_net->ipv4.fib_offload_disabled = true;
1288 }
1289 EXPORT_SYMBOL_GPL(switchdev_fib_ipv4_abort);
1290
1291 static bool switchdev_port_same_parent_id(struct net_device *a,
1292                                           struct net_device *b)
1293 {
1294         struct switchdev_attr a_attr = {
1295                 .orig_dev = a,
1296                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1297                 .flags = SWITCHDEV_F_NO_RECURSE,
1298         };
1299         struct switchdev_attr b_attr = {
1300                 .orig_dev = b,
1301                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1302                 .flags = SWITCHDEV_F_NO_RECURSE,
1303         };
1304
1305         if (switchdev_port_attr_get(a, &a_attr) ||
1306             switchdev_port_attr_get(b, &b_attr))
1307                 return false;
1308
1309         return netdev_phys_item_id_same(&a_attr.u.ppid, &b_attr.u.ppid);
1310 }
1311
1312 static u32 switchdev_port_fwd_mark_get(struct net_device *dev,
1313                                        struct net_device *group_dev)
1314 {
1315         struct net_device *lower_dev;
1316         struct list_head *iter;
1317
1318         netdev_for_each_lower_dev(group_dev, lower_dev, iter) {
1319                 if (lower_dev == dev)
1320                         continue;
1321                 if (switchdev_port_same_parent_id(dev, lower_dev))
1322                         return lower_dev->offload_fwd_mark;
1323                 return switchdev_port_fwd_mark_get(dev, lower_dev);
1324         }
1325
1326         return dev->ifindex;
1327 }
1328
1329 static void switchdev_port_fwd_mark_reset(struct net_device *group_dev,
1330                                           u32 old_mark, u32 *reset_mark)
1331 {
1332         struct net_device *lower_dev;
1333         struct list_head *iter;
1334
1335         netdev_for_each_lower_dev(group_dev, lower_dev, iter) {
1336                 if (lower_dev->offload_fwd_mark == old_mark) {
1337                         if (!*reset_mark)
1338                                 *reset_mark = lower_dev->ifindex;
1339                         lower_dev->offload_fwd_mark = *reset_mark;
1340                 }
1341                 switchdev_port_fwd_mark_reset(lower_dev, old_mark, reset_mark);
1342         }
1343 }
1344
1345 /**
1346  *      switchdev_port_fwd_mark_set - Set port offload forwarding mark
1347  *
1348  *      @dev: port device
1349  *      @group_dev: containing device
1350  *      @joining: true if dev is joining group; false if leaving group
1351  *
1352  *      An ungrouped port's offload mark is just its ifindex.  A grouped
1353  *      port's (member of a bridge, for example) offload mark is the ifindex
1354  *      of one of the ports in the group with the same parent (switch) ID.
1355  *      Ports on the same device in the same group will have the same mark.
1356  *
1357  *      Example:
1358  *
1359  *              br0             ifindex=9
1360  *                sw1p1         ifindex=2       mark=2
1361  *                sw1p2         ifindex=3       mark=2
1362  *                sw2p1         ifindex=4       mark=5
1363  *                sw2p2         ifindex=5       mark=5
1364  *
1365  *      If sw2p2 leaves the bridge, we'll have:
1366  *
1367  *              br0             ifindex=9
1368  *                sw1p1         ifindex=2       mark=2
1369  *                sw1p2         ifindex=3       mark=2
1370  *                sw2p1         ifindex=4       mark=4
1371  *              sw2p2           ifindex=5       mark=5
1372  */
1373 void switchdev_port_fwd_mark_set(struct net_device *dev,
1374                                  struct net_device *group_dev,
1375                                  bool joining)
1376 {
1377         u32 mark = dev->ifindex;
1378         u32 reset_mark = 0;
1379
1380         if (group_dev) {
1381                 ASSERT_RTNL();
1382                 if (joining)
1383                         mark = switchdev_port_fwd_mark_get(dev, group_dev);
1384                 else if (dev->offload_fwd_mark == mark)
1385                         /* Ohoh, this port was the mark reference port,
1386                          * but it's leaving the group, so reset the
1387                          * mark for the remaining ports in the group.
1388                          */
1389                         switchdev_port_fwd_mark_reset(group_dev, mark,
1390                                                       &reset_mark);
1391         }
1392
1393         dev->offload_fwd_mark = mark;
1394 }
1395 EXPORT_SYMBOL_GPL(switchdev_port_fwd_mark_set);