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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
22static LIST_HEAD(deferred);
23static DEFINE_SPINLOCK(deferred_lock);
24
25typedef void switchdev_deferred_func_t(struct net_device *dev,
26 const void *data);
27
28struct 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
35static 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);
47unlock:
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 */
58void 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}
70EXPORT_SYMBOL_GPL(switchdev_deferred_process);
71
72static void switchdev_deferred_process_work(struct work_struct *work)
73{
74 rtnl_lock();
75 switchdev_deferred_process();
76 rtnl_unlock();
77}
78
79static DECLARE_WORK(deferred_process_work, switchdev_deferred_process_work);
80
81static 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
101static 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
128static 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
136static 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
150static 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 */
167int 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}
176EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
177
178static 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
193static 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
217static 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
233static 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 */
250int 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}
260EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
261
262static 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
269static 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
283static 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 */
299int 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}
307EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
308
309static ATOMIC_NOTIFIER_HEAD(switchdev_notif_chain);
310static 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 */
318int register_switchdev_notifier(struct notifier_block *nb)
319{
320 return atomic_notifier_chain_register(&switchdev_notif_chain, nb);
321}
322EXPORT_SYMBOL_GPL(register_switchdev_notifier);
323
324/**
325 * unregister_switchdev_notifier - Unregister notifier
326 * @nb: notifier_block
327 *
328 * Unregister switch device notifier.
329 */
330int unregister_switchdev_notifier(struct notifier_block *nb)
331{
332 return atomic_notifier_chain_unregister(&switchdev_notif_chain, nb);
333}
334EXPORT_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 */
344int 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}
352EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
353
354int 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}
360EXPORT_SYMBOL_GPL(register_switchdev_blocking_notifier);
361
362int 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}
368EXPORT_SYMBOL_GPL(unregister_switchdev_blocking_notifier);
369
370int 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}
379EXPORT_SYMBOL_GPL(call_switchdev_blocking_notifiers);
380
381static int __switchdev_handle_port_obj_add(struct net_device *dev,
382 struct switchdev_notifier_port_obj_info *port_obj_info,
383 bool (*check_cb)(const struct net_device *dev),
384 int (*add_cb)(struct net_device *dev, const void *ctx,
385 const struct switchdev_obj *obj,
386 struct netlink_ext_ack *extack))
387{
388 struct switchdev_notifier_info *info = &port_obj_info->info;
389 struct netlink_ext_ack *extack;
390 struct net_device *lower_dev;
391 struct list_head *iter;
392 int err = -EOPNOTSUPP;
393
394 extack = switchdev_notifier_info_to_extack(info);
395
396 if (check_cb(dev)) {
397 err = add_cb(dev, info->ctx, port_obj_info->obj, extack);
398 if (err != -EOPNOTSUPP)
399 port_obj_info->handled = true;
400 return err;
401 }
402
403 /* Switch ports might be stacked under e.g. a LAG. Ignore the
404 * unsupported devices, another driver might be able to handle them. But
405 * propagate to the callers any hard errors.
406 *
407 * If the driver does its own bookkeeping of stacked ports, it's not
408 * necessary to go through this helper.
409 */
410 netdev_for_each_lower_dev(dev, lower_dev, iter) {
411 if (netif_is_bridge_master(lower_dev))
412 continue;
413
414 err = __switchdev_handle_port_obj_add(lower_dev, port_obj_info,
415 check_cb, add_cb);
416 if (err && err != -EOPNOTSUPP)
417 return err;
418 }
419
420 return err;
421}
422
423int switchdev_handle_port_obj_add(struct net_device *dev,
424 struct switchdev_notifier_port_obj_info *port_obj_info,
425 bool (*check_cb)(const struct net_device *dev),
426 int (*add_cb)(struct net_device *dev, const void *ctx,
427 const struct switchdev_obj *obj,
428 struct netlink_ext_ack *extack))
429{
430 int err;
431
432 err = __switchdev_handle_port_obj_add(dev, port_obj_info, check_cb,
433 add_cb);
434 if (err == -EOPNOTSUPP)
435 err = 0;
436 return err;
437}
438EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_add);
439
440static int __switchdev_handle_port_obj_del(struct net_device *dev,
441 struct switchdev_notifier_port_obj_info *port_obj_info,
442 bool (*check_cb)(const struct net_device *dev),
443 int (*del_cb)(struct net_device *dev, const void *ctx,
444 const struct switchdev_obj *obj))
445{
446 struct switchdev_notifier_info *info = &port_obj_info->info;
447 struct net_device *lower_dev;
448 struct list_head *iter;
449 int err = -EOPNOTSUPP;
450
451 if (check_cb(dev)) {
452 err = del_cb(dev, info->ctx, port_obj_info->obj);
453 if (err != -EOPNOTSUPP)
454 port_obj_info->handled = true;
455 return err;
456 }
457
458 /* Switch ports might be stacked under e.g. a LAG. Ignore the
459 * unsupported devices, another driver might be able to handle them. But
460 * propagate to the callers any hard errors.
461 *
462 * If the driver does its own bookkeeping of stacked ports, it's not
463 * necessary to go through this helper.
464 */
465 netdev_for_each_lower_dev(dev, lower_dev, iter) {
466 if (netif_is_bridge_master(lower_dev))
467 continue;
468
469 err = __switchdev_handle_port_obj_del(lower_dev, port_obj_info,
470 check_cb, del_cb);
471 if (err && err != -EOPNOTSUPP)
472 return err;
473 }
474
475 return err;
476}
477
478int switchdev_handle_port_obj_del(struct net_device *dev,
479 struct switchdev_notifier_port_obj_info *port_obj_info,
480 bool (*check_cb)(const struct net_device *dev),
481 int (*del_cb)(struct net_device *dev, const void *ctx,
482 const struct switchdev_obj *obj))
483{
484 int err;
485
486 err = __switchdev_handle_port_obj_del(dev, port_obj_info, check_cb,
487 del_cb);
488 if (err == -EOPNOTSUPP)
489 err = 0;
490 return err;
491}
492EXPORT_SYMBOL_GPL(switchdev_handle_port_obj_del);
493
494static int __switchdev_handle_port_attr_set(struct net_device *dev,
495 struct switchdev_notifier_port_attr_info *port_attr_info,
496 bool (*check_cb)(const struct net_device *dev),
497 int (*set_cb)(struct net_device *dev, const void *ctx,
498 const struct switchdev_attr *attr,
499 struct netlink_ext_ack *extack))
500{
501 struct switchdev_notifier_info *info = &port_attr_info->info;
502 struct netlink_ext_ack *extack;
503 struct net_device *lower_dev;
504 struct list_head *iter;
505 int err = -EOPNOTSUPP;
506
507 extack = switchdev_notifier_info_to_extack(info);
508
509 if (check_cb(dev)) {
510 err = set_cb(dev, info->ctx, port_attr_info->attr, extack);
511 if (err != -EOPNOTSUPP)
512 port_attr_info->handled = true;
513 return err;
514 }
515
516 /* Switch ports might be stacked under e.g. a LAG. Ignore the
517 * unsupported devices, another driver might be able to handle them. But
518 * propagate to the callers any hard errors.
519 *
520 * If the driver does its own bookkeeping of stacked ports, it's not
521 * necessary to go through this helper.
522 */
523 netdev_for_each_lower_dev(dev, lower_dev, iter) {
524 if (netif_is_bridge_master(lower_dev))
525 continue;
526
527 err = __switchdev_handle_port_attr_set(lower_dev, port_attr_info,
528 check_cb, set_cb);
529 if (err && err != -EOPNOTSUPP)
530 return err;
531 }
532
533 return err;
534}
535
536int switchdev_handle_port_attr_set(struct net_device *dev,
537 struct switchdev_notifier_port_attr_info *port_attr_info,
538 bool (*check_cb)(const struct net_device *dev),
539 int (*set_cb)(struct net_device *dev, const void *ctx,
540 const struct switchdev_attr *attr,
541 struct netlink_ext_ack *extack))
542{
543 int err;
544
545 err = __switchdev_handle_port_attr_set(dev, port_attr_info, check_cb,
546 set_cb);
547 if (err == -EOPNOTSUPP)
548 err = 0;
549 return err;
550}
551EXPORT_SYMBOL_GPL(switchdev_handle_port_attr_set);
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 */
39void 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}
47EXPORT_SYMBOL_GPL(switchdev_trans_item_enqueue);
48
49static 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 */
67void *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}
75EXPORT_SYMBOL_GPL(switchdev_trans_item_dequeue);
76
77static void switchdev_trans_init(struct switchdev_trans *trans)
78{
79 INIT_LIST_HEAD(&trans->item_list);
80}
81
82static 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
90static 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
98static LIST_HEAD(deferred);
99static DEFINE_SPINLOCK(deferred_lock);
100
101typedef void switchdev_deferred_func_t(struct net_device *dev,
102 const void *data);
103
104struct 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
111static 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);
123unlock:
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 */
134void 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}
146EXPORT_SYMBOL_GPL(switchdev_deferred_process);
147
148static void switchdev_deferred_process_work(struct work_struct *work)
149{
150 rtnl_lock();
151 switchdev_deferred_process();
152 rtnl_unlock();
153}
154
155static DECLARE_WORK(deferred_process_work, switchdev_deferred_process_work);
156
157static 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 */
183int 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}
217EXPORT_SYMBOL_GPL(switchdev_port_attr_get);
218
219static 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
247done:
248 if (err == -EOPNOTSUPP && attr->flags & SWITCHDEV_F_SKIP_EOPNOTSUPP)
249 err = 0;
250
251 return err;
252}
253
254static 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
297static 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
311static 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 */
331int 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}
339EXPORT_SYMBOL_GPL(switchdev_port_attr_set);
340
341static 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_MDB:
347 return sizeof(struct switchdev_obj_port_mdb);
348 case SWITCHDEV_OBJ_ID_HOST_MDB:
349 return sizeof(struct switchdev_obj_port_mdb);
350 default:
351 BUG();
352 }
353 return 0;
354}
355
356static 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
382static 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
426static 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
440static 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 */
461int 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}
469EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
470
471static 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
496static 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
510static 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 */
527int 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}
535EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
536
537static ATOMIC_NOTIFIER_HEAD(switchdev_notif_chain);
538
539/**
540 * register_switchdev_notifier - Register notifier
541 * @nb: notifier_block
542 *
543 * Register switch device notifier.
544 */
545int register_switchdev_notifier(struct notifier_block *nb)
546{
547 return atomic_notifier_chain_register(&switchdev_notif_chain, nb);
548}
549EXPORT_SYMBOL_GPL(register_switchdev_notifier);
550
551/**
552 * unregister_switchdev_notifier - Unregister notifier
553 * @nb: notifier_block
554 *
555 * Unregister switch device notifier.
556 */
557int unregister_switchdev_notifier(struct notifier_block *nb)
558{
559 return atomic_notifier_chain_unregister(&switchdev_notif_chain, nb);
560}
561EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
562
563/**
564 * call_switchdev_notifiers - Call notifiers
565 * @val: value passed unmodified to notifier function
566 * @dev: port device
567 * @info: notifier information data
568 *
569 * Call all network notifier blocks.
570 */
571int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
572 struct switchdev_notifier_info *info)
573{
574 info->dev = dev;
575 return atomic_notifier_call_chain(&switchdev_notif_chain, val, info);
576}
577EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
578
579bool switchdev_port_same_parent_id(struct net_device *a,
580 struct net_device *b)
581{
582 struct switchdev_attr a_attr = {
583 .orig_dev = a,
584 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
585 };
586 struct switchdev_attr b_attr = {
587 .orig_dev = b,
588 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
589 };
590
591 if (switchdev_port_attr_get(a, &a_attr) ||
592 switchdev_port_attr_get(b, &b_attr))
593 return false;
594
595 return netdev_phys_item_id_same(&a_attr.u.ppid, &b_attr.u.ppid);
596}
597EXPORT_SYMBOL_GPL(switchdev_port_same_parent_id);