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Linux/net/switchdev/switchdev.c

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  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_MDB:
347                 return sizeof(struct switchdev_obj_port_mdb);
348         default:
349                 BUG();
350         }
351         return 0;
352 }
353 
354 static int __switchdev_port_obj_add(struct net_device *dev,
355                                     const struct switchdev_obj *obj,
356                                     struct switchdev_trans *trans)
357 {
358         const struct switchdev_ops *ops = dev->switchdev_ops;
359         struct net_device *lower_dev;
360         struct list_head *iter;
361         int err = -EOPNOTSUPP;
362 
363         if (ops && ops->switchdev_port_obj_add)
364                 return ops->switchdev_port_obj_add(dev, obj, trans);
365 
366         /* Switch device port(s) may be stacked under
367          * bond/team/vlan dev, so recurse down to add object on
368          * each port.
369          */
370 
371         netdev_for_each_lower_dev(dev, lower_dev, iter) {
372                 err = __switchdev_port_obj_add(lower_dev, obj, trans);
373                 if (err)
374                         break;
375         }
376 
377         return err;
378 }
379 
380 static int switchdev_port_obj_add_now(struct net_device *dev,
381                                       const struct switchdev_obj *obj)
382 {
383         struct switchdev_trans trans;
384         int err;
385 
386         ASSERT_RTNL();
387 
388         switchdev_trans_init(&trans);
389 
390         /* Phase I: prepare for obj add. Driver/device should fail
391          * here if there are going to be issues in the commit phase,
392          * such as lack of resources or support.  The driver/device
393          * should reserve resources needed for the commit phase here,
394          * but should not commit the obj.
395          */
396 
397         trans.ph_prepare = true;
398         err = __switchdev_port_obj_add(dev, obj, &trans);
399         if (err) {
400                 /* Prepare phase failed: abort the transaction.  Any
401                  * resources reserved in the prepare phase are
402                  * released.
403                  */
404 
405                 if (err != -EOPNOTSUPP)
406                         switchdev_trans_items_destroy(&trans);
407 
408                 return err;
409         }
410 
411         /* Phase II: commit obj add.  This cannot fail as a fault
412          * of driver/device.  If it does, it's a bug in the driver/device
413          * because the driver said everythings was OK in phase I.
414          */
415 
416         trans.ph_prepare = false;
417         err = __switchdev_port_obj_add(dev, obj, &trans);
418         WARN(err, "%s: Commit of object (id=%d) failed.\n", dev->name, obj->id);
419         switchdev_trans_items_warn_destroy(dev, &trans);
420 
421         return err;
422 }
423 
424 static void switchdev_port_obj_add_deferred(struct net_device *dev,
425                                             const void *data)
426 {
427         const struct switchdev_obj *obj = data;
428         int err;
429 
430         err = switchdev_port_obj_add_now(dev, obj);
431         if (err && err != -EOPNOTSUPP)
432                 netdev_err(dev, "failed (err=%d) to add object (id=%d)\n",
433                            err, obj->id);
434         if (obj->complete)
435                 obj->complete(dev, err, obj->complete_priv);
436 }
437 
438 static int switchdev_port_obj_add_defer(struct net_device *dev,
439                                         const struct switchdev_obj *obj)
440 {
441         return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
442                                           switchdev_port_obj_add_deferred);
443 }
444 
445 /**
446  *      switchdev_port_obj_add - Add port object
447  *
448  *      @dev: port device
449  *      @id: object ID
450  *      @obj: object to add
451  *
452  *      Use a 2-phase prepare-commit transaction model to ensure
453  *      system is not left in a partially updated state due to
454  *      failure from driver/device.
455  *
456  *      rtnl_lock must be held and must not be in atomic section,
457  *      in case SWITCHDEV_F_DEFER flag is not set.
458  */
459 int switchdev_port_obj_add(struct net_device *dev,
460                            const struct switchdev_obj *obj)
461 {
462         if (obj->flags & SWITCHDEV_F_DEFER)
463                 return switchdev_port_obj_add_defer(dev, obj);
464         ASSERT_RTNL();
465         return switchdev_port_obj_add_now(dev, obj);
466 }
467 EXPORT_SYMBOL_GPL(switchdev_port_obj_add);
468 
469 static int switchdev_port_obj_del_now(struct net_device *dev,
470                                       const struct switchdev_obj *obj)
471 {
472         const struct switchdev_ops *ops = dev->switchdev_ops;
473         struct net_device *lower_dev;
474         struct list_head *iter;
475         int err = -EOPNOTSUPP;
476 
477         if (ops && ops->switchdev_port_obj_del)
478                 return ops->switchdev_port_obj_del(dev, obj);
479 
480         /* Switch device port(s) may be stacked under
481          * bond/team/vlan dev, so recurse down to delete object on
482          * each port.
483          */
484 
485         netdev_for_each_lower_dev(dev, lower_dev, iter) {
486                 err = switchdev_port_obj_del_now(lower_dev, obj);
487                 if (err)
488                         break;
489         }
490 
491         return err;
492 }
493 
494 static void switchdev_port_obj_del_deferred(struct net_device *dev,
495                                             const void *data)
496 {
497         const struct switchdev_obj *obj = data;
498         int err;
499 
500         err = switchdev_port_obj_del_now(dev, obj);
501         if (err && err != -EOPNOTSUPP)
502                 netdev_err(dev, "failed (err=%d) to del object (id=%d)\n",
503                            err, obj->id);
504         if (obj->complete)
505                 obj->complete(dev, err, obj->complete_priv);
506 }
507 
508 static int switchdev_port_obj_del_defer(struct net_device *dev,
509                                         const struct switchdev_obj *obj)
510 {
511         return switchdev_deferred_enqueue(dev, obj, switchdev_obj_size(obj),
512                                           switchdev_port_obj_del_deferred);
513 }
514 
515 /**
516  *      switchdev_port_obj_del - Delete port object
517  *
518  *      @dev: port device
519  *      @id: object ID
520  *      @obj: object to delete
521  *
522  *      rtnl_lock must be held and must not be in atomic section,
523  *      in case SWITCHDEV_F_DEFER flag is not set.
524  */
525 int switchdev_port_obj_del(struct net_device *dev,
526                            const struct switchdev_obj *obj)
527 {
528         if (obj->flags & SWITCHDEV_F_DEFER)
529                 return switchdev_port_obj_del_defer(dev, obj);
530         ASSERT_RTNL();
531         return switchdev_port_obj_del_now(dev, obj);
532 }
533 EXPORT_SYMBOL_GPL(switchdev_port_obj_del);
534 
535 static ATOMIC_NOTIFIER_HEAD(switchdev_notif_chain);
536 
537 /**
538  *      register_switchdev_notifier - Register notifier
539  *      @nb: notifier_block
540  *
541  *      Register switch device notifier.
542  */
543 int register_switchdev_notifier(struct notifier_block *nb)
544 {
545         return atomic_notifier_chain_register(&switchdev_notif_chain, nb);
546 }
547 EXPORT_SYMBOL_GPL(register_switchdev_notifier);
548 
549 /**
550  *      unregister_switchdev_notifier - Unregister notifier
551  *      @nb: notifier_block
552  *
553  *      Unregister switch device notifier.
554  */
555 int unregister_switchdev_notifier(struct notifier_block *nb)
556 {
557         return atomic_notifier_chain_unregister(&switchdev_notif_chain, nb);
558 }
559 EXPORT_SYMBOL_GPL(unregister_switchdev_notifier);
560 
561 /**
562  *      call_switchdev_notifiers - Call notifiers
563  *      @val: value passed unmodified to notifier function
564  *      @dev: port device
565  *      @info: notifier information data
566  *
567  *      Call all network notifier blocks.
568  */
569 int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
570                              struct switchdev_notifier_info *info)
571 {
572         info->dev = dev;
573         return atomic_notifier_call_chain(&switchdev_notif_chain, val, info);
574 }
575 EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
576 
577 bool switchdev_port_same_parent_id(struct net_device *a,
578                                    struct net_device *b)
579 {
580         struct switchdev_attr a_attr = {
581                 .orig_dev = a,
582                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
583         };
584         struct switchdev_attr b_attr = {
585                 .orig_dev = b,
586                 .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID,
587         };
588 
589         if (switchdev_port_attr_get(a, &a_attr) ||
590             switchdev_port_attr_get(b, &b_attr))
591                 return false;
592 
593         return netdev_phys_item_id_same(&a_attr.u.ppid, &b_attr.u.ppid);
594 }
595 EXPORT_SYMBOL_GPL(switchdev_port_same_parent_id);
596 

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