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