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