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/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         if (attr->complete)
 308                 attr->complete(dev, err, attr->complete_priv);
 309 }
 310
 311 static int switchdev_port_attr_set_defer(struct net_device *dev,
 312                                          const struct switchdev_attr *attr)
 313 {
 314         return switchdev_deferred_enqueue(dev, attr, sizeof(*attr),
 315                                           switchdev_port_attr_set_deferred);
 316 }
 317
 318 /**
 319  *      switchdev_port_attr_set - Set port attribute
 320  *
 321  *      @dev: port device
 322  *      @attr: attribute to set
 323  *
 324  *      Use a 2-phase prepare-commit transaction model to ensure
 325  *      system is not left in a partially updated state due to
 326  *      failure from driver/device.
 327  *
 328  *      rtnl_lock must be held and must not be in atomic section,
 329  *      in case SWITCHDEV_F_DEFER flag is not set.
 330  */
 331 int switchdev_port_attr_set(struct net_device *dev,
 332                             const struct switchdev_attr *attr)
 333 {
 334         if (attr->flags & SWITCHDEV_F_DEFER)
 335                 return switchdev_port_attr_set_defer(dev, attr);
 336         ASSERT_RTNL();
 337         return switchdev_port_attr_set_now(dev, attr);
 338 }
 339 EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
 340
 341 static size_t switchdev_obj_size(const struct switchdev_obj *obj)
 342 {
 343         switch (obj->id) {
 344         case SWITCHDEV_OBJ_ID_PORT_VLAN:
 345                 return sizeof(struct switchdev_obj_port_vlan);
 346         case SWITCHDEV_OBJ_ID_PORT_FDB:
 347                 return sizeof(struct switchdev_obj_port_fdb);
 348         case SWITCHDEV_OBJ_ID_PORT_MDB:
 349                 return sizeof(struct switchdev_obj_port_mdb);
 350         default:
 351                 BUG();
 352         }
 353         return 0;
 354 }
 355
 356 static int __switchdev_port_obj_add(struct net_device *dev,
 357                                     const struct switchdev_obj *obj,
 358                                     struct switchdev_trans *trans)
 359 {
 360         const struct switchdev_ops *ops = dev->switchdev_ops;
 361         struct net_device *lower_dev;
 362         struct list_head *iter;
 363         int err = -EOPNOTSUPP;
 364
 365         if (ops && ops->switchdev_port_obj_add)
 366                 return ops->switchdev_port_obj_add(dev, obj, trans);
 367
 368         /* Switch device port(s) may be stacked under
 369          * bond/team/vlan dev, so recurse down to add object on
 370          * each port.
 371          */
 372
 373         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 374                 err = __switchdev_port_obj_add(lower_dev, obj, trans);
 375                 if (err)
 376                         break;
 377         }
 378
 379         return err;
 380 }
 381
 382 static int switchdev_port_obj_add_now(struct net_device *dev,
 383                                       const struct switchdev_obj *obj)
 384 {
 385         struct switchdev_trans trans;
 386         int err;
 387
 388         ASSERT_RTNL();
 389
 390         switchdev_trans_init(&trans);
 391
 392         /* Phase I: prepare for obj add. Driver/device should fail
 393          * here if there are going to be issues in the commit phase,
 394          * such as lack of resources or support.  The driver/device
 395          * should reserve resources needed for the commit phase here,
 396          * but should not commit the obj.
 397          */
 398
 399         trans.ph_prepare = true;
 400         err = __switchdev_port_obj_add(dev, obj, &trans);
 401         if (err) {
 402                 /* Prepare phase failed: abort the transaction.  Any
 403                  * resources reserved in the prepare phase are
 404                  * released.
 405                  */
 406
 407                 if (err != -EOPNOTSUPP)
 408                         switchdev_trans_items_destroy(&trans);
 409
 410                 return err;
 411         }
 412
 413         /* Phase II: commit obj add.  This cannot fail as a fault
 414          * of driver/device.  If it does, it's a bug in the driver/device
 415          * because the driver said everythings was OK in phase I.
 416          */
 417
 418         trans.ph_prepare = false;
 419         err = __switchdev_port_obj_add(dev, obj, &trans);
 420         WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id);
 421         switchdev_trans_items_warn_destroy(dev, &trans);
 422
 423         return err;
 424 }
 425
 426 static void switchdev_port_obj_add_deferred(struct net_device *dev,
 427                                             const void *data)
 428 {
 429         const struct switchdev_obj *obj = data;
 430         int err;
 431
 432         err = switchdev_port_obj_add_now(dev, obj);
 433         if (err && err != -EOPNOTSUPP)
 434                 netdev_err(dev, "failed (err=%d) to add object (id=%d)\n",
 435                            err, obj->id);
 436         if (obj->complete)
 437                 obj->complete(dev, err, obj->complete_priv);
 438 }
 439
 440 static int switchdev_port_obj_add_defer(struct net_device *dev,
 441                                         const struct switchdev_obj *obj)
 442 {
 443         return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
 444                                           switchdev_port_obj_add_deferred);
 445 }
 446
 447 /**
 448  *      switchdev_port_obj_add - Add port object
 449  *
 450  *      @dev: port device
 451  *      @id: object ID
 452  *      @obj: object to add
 453  *
 454  *      Use a 2-phase prepare-commit transaction model to ensure
 455  *      system is not left in a partially updated state due to
 456  *      failure from driver/device.
 457  *
 458  *      rtnl_lock must be held and must not be in atomic section,
 459  *      in case SWITCHDEV_F_DEFER flag is not set.
 460  */
 461 int switchdev_port_obj_add(struct net_device *dev,
 462                            const struct switchdev_obj *obj)
 463 {
 464         if (obj->flags & SWITCHDEV_F_DEFER)
 465                 return switchdev_port_obj_add_defer(dev, obj);
 466         ASSERT_RTNL();
 467         return switchdev_port_obj_add_now(dev, obj);
 468 }
 469 EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
 470
 471 static int switchdev_port_obj_del_now(struct net_device *dev,
 472                                       const struct switchdev_obj *obj)
 473 {
 474         const struct switchdev_ops *ops = dev->switchdev_ops;
 475         struct net_device *lower_dev;
 476         struct list_head *iter;
 477         int err = -EOPNOTSUPP;
 478
 479         if (ops && ops->switchdev_port_obj_del)
 480                 return ops->switchdev_port_obj_del(dev, obj);
 481
 482         /* Switch device port(s) may be stacked under
 483          * bond/team/vlan dev, so recurse down to delete object on
 484          * each port.
 485          */
 486
 487         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 488                 err = switchdev_port_obj_del_now(lower_dev, obj);
 489                 if (err)
 490                         break;
 491         }
 492
 493         return err;
 494 }
 495
 496 static void switchdev_port_obj_del_deferred(struct net_device *dev,
 497                                             const void *data)
 498 {
 499         const struct switchdev_obj *obj = data;
 500         int err;
 501
 502         err = switchdev_port_obj_del_now(dev, obj);
 503         if (err && err != -EOPNOTSUPP)
 504                 netdev_err(dev, "failed (err=%d) to del object (id=%d)\n",
 505                            err, obj->id);
 506         if (obj->complete)
 507                 obj->complete(dev, err, obj->complete_priv);
 508 }
 509
 510 static int switchdev_port_obj_del_defer(struct net_device *dev,
 511                                         const struct switchdev_obj *obj)
 512 {
 513         return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
 514                                           switchdev_port_obj_del_deferred);
 515 }
 516
 517 /**
 518  *      switchdev_port_obj_del - Delete port object
 519  *
 520  *      @dev: port device
 521  *      @id: object ID
 522  *      @obj: object to delete
 523  *
 524  *      rtnl_lock must be held and must not be in atomic section,
 525  *      in case SWITCHDEV_F_DEFER flag is not set.
 526  */
 527 int switchdev_port_obj_del(struct net_device *dev,
 528                            const struct switchdev_obj *obj)
 529 {
 530         if (obj->flags & SWITCHDEV_F_DEFER)
 531                 return switchdev_port_obj_del_defer(dev, obj);
 532         ASSERT_RTNL();
 533         return switchdev_port_obj_del_now(dev, obj);
 534 }
 535 EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
 536
 537 /**
 538  *      switchdev_port_obj_dump - Dump port objects
 539  *
 540  *      @dev: port device
 541  *      @id: object ID
 542  *      @obj: object to dump
 543  *      @cb: function to call with a filled object
 544  *
 545  *      rtnl_lock must be held.
 546  */
 547 int switchdev_port_obj_dump(struct net_device *dev, struct switchdev_obj *obj,
 548                             switchdev_obj_dump_cb_t *cb)
 549 {
 550         const struct switchdev_ops *ops = dev->switchdev_ops;
 551         struct net_device *lower_dev;
 552         struct list_head *iter;
 553         int err = -EOPNOTSUPP;
 554
 555         ASSERT_RTNL();
 556
 557         if (ops && ops->switchdev_port_obj_dump)
 558                 return ops->switchdev_port_obj_dump(dev, obj, cb);
 559
 560         /* Switch device port(s) may be stacked under
 561          * bond/team/vlan dev, so recurse down to dump objects on
 562          * first port at bottom of stack.
 563          */
 564
 565         netdev_for_each_lower_dev(dev, lower_dev, iter) {
 566                 err = switchdev_port_obj_dump(lower_dev, obj, cb);
 567                 break;
 568         }
 569
 570         return err;
 571 }
 572 EXPORT_SYMBOL_GPL(switchdev_port_obj_dump);
 573
 574 static RAW_NOTIFIER_HEAD(switchdev_notif_chain);
 575
 576 /**
 577  *      register_switchdev_notifier - Register notifier
 578  *      @nb: notifier_block
 579  *
 580  *      Register switch device notifier. This should be used by code
 581  *      which needs to monitor events happening in particular device.
 582  *      Return values are same as for atomic_notifier_chain_register().
 583  */
 584 int register_switchdev_notifier(struct notifier_block *nb)
 585 {
 586         int err;
 587
 588         rtnl_lock();
 589         err = raw_notifier_chain_register(&switchdev_notif_chain, nb);
 590         rtnl_unlock();
 591         return err;
 592 }
 593 EXPORT_SYMBOL_GPL(register_switchdev_notifier);
 594
 595 /**
 596  *      unregister_switchdev_notifier - Unregister notifier
 597  *      @nb: notifier_block
 598  *
 599  *      Unregister switch device notifier.
 600  *      Return values are same as for atomic_notifier_chain_unregister().
 601  */
 602 int unregister_switchdev_notifier(struct notifier_block *nb)
 603 {
 604         int err;
 605
 606         rtnl_lock();
 607         err = raw_notifier_chain_unregister(&switchdev_notif_chain, nb);
 608         rtnl_unlock();
 609         return err;
 610 }
 611 EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
 612
 613 /**
 614  *      call_switchdev_notifiers - Call notifiers
 615  *      @val: value passed unmodified to notifier function
 616  *      @dev: port device
 617  *      @info: notifier information data
 618  *
 619  *      Call all network notifier blocks. This should be called by driver
 620  *      when it needs to propagate hardware event.
 621  *      Return values are same as for atomic_notifier_call_chain().
 622  *      rtnl_lock must be held.
 623  */
 624 int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
 625                              struct switchdev_notifier_info *info)
 626 {
 627         ASSERT_RTNL();
 628
 629         info->dev = dev;
 630         return raw_notifier_call_chain(&switchdev_notif_chain, val, info);
 631 }
 632 EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
 633
 634 struct switchdev_vlan_dump {
 635         struct switchdev_obj_port_vlan vlan;
 636         struct sk_buff *skb;
 637         u32 filter_mask;
 638         u16 flags;
 639         u16 begin;
 640         u16 end;
 641 };
 642
 643 static int switchdev_port_vlan_dump_put(struct switchdev_vlan_dump *dump)
 644 {
 645         struct bridge_vlan_info vinfo;
 646
 647         vinfo.flags = dump->flags;
 648
 649         if (dump->begin == 0 && dump->end == 0) {
 650                 return 0;
 651         } else if (dump->begin == dump->end) {
 652                 vinfo.vid = dump->begin;
 653                 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
 654                             sizeof(vinfo), &vinfo))
 655                         return -EMSGSIZE;
 656         } else {
 657                 vinfo.vid = dump->begin;
 658                 vinfo.flags |= BRIDGE_VLAN_INFO_RANGE_BEGIN;
 659                 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
 660                             sizeof(vinfo), &vinfo))
 661                         return -EMSGSIZE;
 662                 vinfo.vid = dump->end;
 663                 vinfo.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;
 664                 vinfo.flags |= BRIDGE_VLAN_INFO_RANGE_END;
 665                 if (nla_put(dump->skb, IFLA_BRIDGE_VLAN_INFO,
 666                             sizeof(vinfo), &vinfo))
 667                         return -EMSGSIZE;
 668         }
 669
 670         return 0;
 671 }
 672
 673 static int switchdev_port_vlan_dump_cb(struct switchdev_obj *obj)
 674 {
 675         struct switchdev_obj_port_vlan *vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
 676         struct switchdev_vlan_dump *dump =
 677                 container_of(vlan, struct switchdev_vlan_dump, vlan);
 678         int err = 0;
 679
 680         if (vlan->vid_begin > vlan->vid_end)
 681                 return -EINVAL;
 682
 683         if (dump->filter_mask & RTEXT_FILTER_BRVLAN) {
 684                 dump->flags = vlan->flags;
 685                 for (dump->begin = dump->end = vlan->vid_begin;
 686                      dump->begin <= vlan->vid_end;
 687                      dump->begin++, dump->end++) {
 688                         err = switchdev_port_vlan_dump_put(dump);
 689                         if (err)
 690                                 return err;
 691                 }
 692         } else if (dump->filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) {
 693                 if (dump->begin > vlan->vid_begin &&
 694                     dump->begin >= vlan->vid_end) {
 695                         if ((dump->begin - 1) == vlan->vid_end &&
 696                             dump->flags == vlan->flags) {
 697                                 /* prepend */
 698                                 dump->begin = vlan->vid_begin;
 699                         } else {
 700                                 err = switchdev_port_vlan_dump_put(dump);
 701                                 dump->flags = vlan->flags;
 702                                 dump->begin = vlan->vid_begin;
 703                                 dump->end = vlan->vid_end;
 704                         }
 705                 } else if (dump->end <= vlan->vid_begin &&
 706                            dump->end < vlan->vid_end) {
 707                         if ((dump->end  + 1) == vlan->vid_begin &&
 708                             dump->flags == vlan->flags) {
 709                                 /* append */
 710                                 dump->end = vlan->vid_end;
 711                         } else {
 712                                 err = switchdev_port_vlan_dump_put(dump);
 713                                 dump->flags = vlan->flags;
 714                                 dump->begin = vlan->vid_begin;
 715                                 dump->end = vlan->vid_end;
 716                         }
 717                 } else {
 718                         err = -EINVAL;
 719                 }
 720         }
 721
 722         return err;
 723 }
 724
 725 static int switchdev_port_vlan_fill(struct sk_buff *skb, struct net_device *dev,
 726                                     u32 filter_mask)
 727 {
 728         struct switchdev_vlan_dump dump = {
 729                 .vlan.obj.orig_dev = dev,
 730                 .vlan.obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
 731                 .skb = skb,
 732                 .filter_mask = filter_mask,
 733         };
 734         int err = 0;
 735
 736         if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
 737             (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
 738                 err = switchdev_port_obj_dump(dev, &dump.vlan.obj,
 739                                               switchdev_port_vlan_dump_cb);
 740                 if (err)
 741                         goto err_out;
 742                 if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
 743                         /* last one */
 744                         err = switchdev_port_vlan_dump_put(&dump);
 745         }
 746
 747 err_out:
 748         return err == -EOPNOTSUPP ? 0 : err;
 749 }
 750
 751 /**
 752  *      switchdev_port_bridge_getlink - Get bridge port attributes
 753  *
 754  *      @dev: port device
 755  *
 756  *      Called for SELF on rtnl_bridge_getlink to get bridge port
 757  *      attributes.
 758  */
 759 int switchdev_port_bridge_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 760                                   struct net_device *dev, u32 filter_mask,
 761                                   int nlflags)
 762 {
 763         struct switchdev_attr attr = {
 764                 .orig_dev = dev,
 765                 .id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
 766         };
 767         u16 mode = BRIDGE_MODE_UNDEF;
 768         u32 mask = BR_LEARNING | BR_LEARNING_SYNC | BR_FLOOD;
 769         int err;
 770
 771         if (!netif_is_bridge_port(dev))
 772                 return -EOPNOTSUPP;
 773
 774         err = switchdev_port_attr_get(dev, &attr);
 775         if (err && err != -EOPNOTSUPP)
 776                 return err;
 777
 778         return ndo_dflt_bridge_getlink(skb, pid, seq, dev, mode,
 779                                        attr.u.brport_flags, mask, nlflags,
 780                                        filter_mask, switchdev_port_vlan_fill);
 781 }
 782 EXPORT_SYMBOL_GPL(switchdev_port_bridge_getlink);
 783
 784 static int switchdev_port_br_setflag(struct net_device *dev,
 785                                      struct nlattr *nlattr,
 786                                      unsigned long brport_flag)
 787 {
 788         struct switchdev_attr attr = {
 789                 .orig_dev = dev,
 790                 .id = SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
 791         };
 792         u8 flag = nla_get_u8(nlattr);
 793         int err;
 794
 795         err = switchdev_port_attr_get(dev, &attr);
 796         if (err)
 797                 return err;
 798
 799         if (flag)
 800                 attr.u.brport_flags |= brport_flag;
 801         else
 802                 attr.u.brport_flags &= ~brport_flag;
 803
 804         return switchdev_port_attr_set(dev, &attr);
 805 }
 806
 807 static const struct nla_policy
 808 switchdev_port_bridge_policy[IFLA_BRPORT_MAX + 1] = {
 809         [IFLA_BRPORT_STATE]             = { .type = NLA_U8 },
 810         [IFLA_BRPORT_COST]              = { .type = NLA_U32 },
 811         [IFLA_BRPORT_PRIORITY]          = { .type = NLA_U16 },
 812         [IFLA_BRPORT_MODE]              = { .type = NLA_U8 },
 813         [IFLA_BRPORT_GUARD]             = { .type = NLA_U8 },
 814         [IFLA_BRPORT_PROTECT]           = { .type = NLA_U8 },
 815         [IFLA_BRPORT_FAST_LEAVE]        = { .type = NLA_U8 },
 816         [IFLA_BRPORT_LEARNING]          = { .type = NLA_U8 },
 817         [IFLA_BRPORT_LEARNING_SYNC]     = { .type = NLA_U8 },
 818         [IFLA_BRPORT_UNICAST_FLOOD]     = { .type = NLA_U8 },
 819 };
 820
 821 static int switchdev_port_br_setlink_protinfo(struct net_device *dev,
 822                                               struct nlattr *protinfo)
 823 {
 824         struct nlattr *attr;
 825         int rem;
 826         int err;
 827
 828         err = nla_validate_nested(protinfo, IFLA_BRPORT_MAX,
 829                                   switchdev_port_bridge_policy, NULL);
 830         if (err)
 831                 return err;
 832
 833         nla_for_each_nested(attr, protinfo, rem) {
 834                 switch (nla_type(attr)) {
 835                 case IFLA_BRPORT_LEARNING:
 836                         err = switchdev_port_br_setflag(dev, attr,
 837                                                         BR_LEARNING);
 838                         break;
 839                 case IFLA_BRPORT_LEARNING_SYNC:
 840                         err = switchdev_port_br_setflag(dev, attr,
 841                                                         BR_LEARNING_SYNC);
 842                         break;
 843                 case IFLA_BRPORT_UNICAST_FLOOD:
 844                         err = switchdev_port_br_setflag(dev, attr, BR_FLOOD);
 845                         break;
 846                 default:
 847                         err = -EOPNOTSUPP;
 848                         break;
 849                 }
 850                 if (err)
 851                         return err;
 852         }
 853
 854         return 0;
 855 }
 856
 857 static int switchdev_port_br_afspec(struct net_device *dev,
 858                                     struct nlattr *afspec,
 859                                     int (*f)(struct net_device *dev,
 860                                              const struct switchdev_obj *obj))
 861 {
 862         struct nlattr *attr;
 863         struct bridge_vlan_info *vinfo;
 864         struct switchdev_obj_port_vlan vlan = {
 865                 .obj.orig_dev = dev,
 866                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
 867         };
 868         int rem;
 869         int err;
 870
 871         nla_for_each_nested(attr, afspec, rem) {
 872                 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
 873                         continue;
 874                 if (nla_len(attr) != sizeof(struct bridge_vlan_info))
 875                         return -EINVAL;
 876                 vinfo = nla_data(attr);
 877                 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
 878                         return -EINVAL;
 879                 vlan.flags = vinfo->flags;
 880                 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 881                         if (vlan.vid_begin)
 882                                 return -EINVAL;
 883                         vlan.vid_begin = vinfo->vid;
 884                         /* don't allow range of pvids */
 885                         if (vlan.flags & BRIDGE_VLAN_INFO_PVID)
 886                                 return -EINVAL;
 887                 } else if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END) {
 888                         if (!vlan.vid_begin)
 889                                 return -EINVAL;
 890                         vlan.vid_end = vinfo->vid;
 891                         if (vlan.vid_end <= vlan.vid_begin)
 892                                 return -EINVAL;
 893                         err = f(dev, &vlan.obj);
 894                         if (err)
 895                                 return err;
 896                         vlan.vid_begin = 0;
 897                 } else {
 898                         if (vlan.vid_begin)
 899                                 return -EINVAL;
 900                         vlan.vid_begin = vinfo->vid;
 901                         vlan.vid_end = vinfo->vid;
 902                         err = f(dev, &vlan.obj);
 903                         if (err)
 904                                 return err;
 905                         vlan.vid_begin = 0;
 906                 }
 907         }
 908
 909         return 0;
 910 }
 911
 912 /**
 913  *      switchdev_port_bridge_setlink - Set bridge port attributes
 914  *
 915  *      @dev: port device
 916  *      @nlh: netlink header
 917  *      @flags: netlink flags
 918  *
 919  *      Called for SELF on rtnl_bridge_setlink to set bridge port
 920  *      attributes.
 921  */
 922 int switchdev_port_bridge_setlink(struct net_device *dev,
 923                                   struct nlmsghdr *nlh, u16 flags)
 924 {
 925         struct nlattr *protinfo;
 926         struct nlattr *afspec;
 927         int err = 0;
 928
 929         if (!netif_is_bridge_port(dev))
 930                 return -EOPNOTSUPP;
 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         if (!netif_is_bridge_port(dev))
 966                 return -EOPNOTSUPP;
 967
 968         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
 969                                  IFLA_AF_SPEC);
 970         if (afspec)
 971                 return switchdev_port_br_afspec(dev, afspec,
 972                                                 switchdev_port_obj_del);
 973
 974         return 0;
 975 }
 976 EXPORT_SYMBOL_GPL(switchdev_port_bridge_dellink);
 977
 978 /**
 979  *      switchdev_port_fdb_add - Add FDB (MAC/VLAN) entry to port
 980  *
 981  *      @ndmsg: netlink hdr
 982  *      @nlattr: netlink attributes
 983  *      @dev: port device
 984  *      @addr: MAC address to add
 985  *      @vid: VLAN to add
 986  *
 987  *      Add FDB entry to switch device.
 988  */
 989 int switchdev_port_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 990                            struct net_device *dev, const unsigned char *addr,
 991                            u16 vid, u16 nlm_flags)
 992 {
 993         struct switchdev_obj_port_fdb fdb = {
 994                 .obj.orig_dev = dev,
 995                 .obj.id = SWITCHDEV_OBJ_ID_PORT_FDB,
 996                 .vid = vid,
 997         };
 998
 999         ether_addr_copy(fdb.addr, addr);
1000         return switchdev_port_obj_add(dev, &fdb.obj);
1001 }
1002 EXPORT_SYMBOL_GPL(switchdev_port_fdb_add);
1003
1004 /**
1005  *      switchdev_port_fdb_del - Delete FDB (MAC/VLAN) entry from port
1006  *
1007  *      @ndmsg: netlink hdr
1008  *      @nlattr: netlink attributes
1009  *      @dev: port device
1010  *      @addr: MAC address to delete
1011  *      @vid: VLAN to delete
1012  *
1013  *      Delete FDB entry from switch device.
1014  */
1015 int switchdev_port_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1016                            struct net_device *dev, const unsigned char *addr,
1017                            u16 vid)
1018 {
1019         struct switchdev_obj_port_fdb fdb = {
1020                 .obj.orig_dev = dev,
1021                 .obj.id = SWITCHDEV_OBJ_ID_PORT_FDB,
1022                 .vid = vid,
1023         };
1024
1025         ether_addr_copy(fdb.addr, addr);
1026         return switchdev_port_obj_del(dev, &fdb.obj);
1027 }
1028 EXPORT_SYMBOL_GPL(switchdev_port_fdb_del);
1029
1030 struct switchdev_fdb_dump {
1031         struct switchdev_obj_port_fdb fdb;
1032         struct net_device *dev;
1033         struct sk_buff *skb;
1034         struct netlink_callback *cb;
1035         int idx;
1036 };
1037
1038 static int switchdev_port_fdb_dump_cb(struct switchdev_obj *obj)
1039 {
1040         struct switchdev_obj_port_fdb *fdb = SWITCHDEV_OBJ_PORT_FDB(obj);
1041         struct switchdev_fdb_dump *dump =
1042                 container_of(fdb, struct switchdev_fdb_dump, fdb);
1043         u32 portid = NETLINK_CB(dump->cb->skb).portid;
1044         u32 seq = dump->cb->nlh->nlmsg_seq;
1045         struct nlmsghdr *nlh;
1046         struct ndmsg *ndm;
1047
1048         if (dump->idx < dump->cb->args[2])
1049                 goto skip;
1050
1051         nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
1052                         sizeof(*ndm), NLM_F_MULTI);
1053         if (!nlh)
1054                 return -EMSGSIZE;
1055
1056         ndm = nlmsg_data(nlh);
1057         ndm->ndm_family  = AF_BRIDGE;
1058         ndm->ndm_pad1    = 0;
1059         ndm->ndm_pad2    = 0;
1060         ndm->ndm_flags   = NTF_SELF;
1061         ndm->ndm_type    = 0;
1062         ndm->ndm_ifindex = dump->dev->ifindex;
1063         ndm->ndm_state   = fdb->ndm_state;
1064
1065         if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, fdb->addr))
1066                 goto nla_put_failure;
1067
1068         if (fdb->vid && nla_put_u16(dump->skb, NDA_VLAN, fdb->vid))
1069                 goto nla_put_failure;
1070
1071         nlmsg_end(dump->skb, nlh);
1072
1073 skip:
1074         dump->idx++;
1075         return 0;
1076
1077 nla_put_failure:
1078         nlmsg_cancel(dump->skb, nlh);
1079         return -EMSGSIZE;
1080 }
1081
1082 /**
1083  *      switchdev_port_fdb_dump - Dump port FDB (MAC/VLAN) entries
1084  *
1085  *      @skb: netlink skb
1086  *      @cb: netlink callback
1087  *      @dev: port device
1088  *      @filter_dev: filter device
1089  *      @idx:
1090  *
1091  *      Dump FDB entries from switch device.
1092  */
1093 int switchdev_port_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
1094                             struct net_device *dev,
1095                             struct net_device *filter_dev, int *idx)
1096 {
1097         struct switchdev_fdb_dump dump = {
1098                 .fdb.obj.orig_dev = dev,
1099                 .fdb.obj.id = SWITCHDEV_OBJ_ID_PORT_FDB,
1100                 .dev = dev,
1101                 .skb = skb,
1102                 .cb = cb,
1103                 .idx = *idx,
1104         };
1105         int err;
1106
1107         err = switchdev_port_obj_dump(dev, &dump.fdb.obj,
1108                                       switchdev_port_fdb_dump_cb);
1109         *idx = dump.idx;
1110         return err;
1111 }
1112 EXPORT_SYMBOL_GPL(switchdev_port_fdb_dump);
1113
1114 bool switchdev_port_same_parent_id(struct net_device *a,
1115                                    struct net_device *b)
1116 {
1117         struct switchdev_attr a_attr = {
1118                 .orig_dev = a,
1119                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1120         };
1121         struct switchdev_attr b_attr = {
1122                 .orig_dev = b,
1123                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
1124         };
1125
1126         if (switchdev_port_attr_get(a, &a_attr) ||
1127             switchdev_port_attr_get(b, &b_attr))
1128                 return false;
1129
1130         return netdev_phys_item_id_same(&a_attr.u.ppid, &b_attr.u.ppid);
1131 }
1132 EXPORT_SYMBOL_GPL(switchdev_port_same_parent_id);