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Merge commit '4cb38750d49010ae72e718d46605ac9ba5a851b4' into stable/for-linus-3.6
[deliverable/linux.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35 #include "ipoib.h"
36
37 #include <linux/module.h>
38
39 #include <linux/init.h>
40 #include <linux/slab.h>
41 #include <linux/kernel.h>
42 #include <linux/vmalloc.h>
43
44 #include <linux/if_arp.h> /* For ARPHRD_xxx */
45
46 #include <linux/ip.h>
47 #include <linux/in.h>
48
49 #include <net/dst.h>
50
51 MODULE_AUTHOR("Roland Dreier");
52 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
53 MODULE_LICENSE("Dual BSD/GPL");
54
55 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
56 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
57
58 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
59 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
60 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
61 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
62
63 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
64 int ipoib_debug_level;
65
66 module_param_named(debug_level, ipoib_debug_level, int, 0644);
67 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
68 #endif
69
70 struct ipoib_path_iter {
71 struct net_device *dev;
72 struct ipoib_path path;
73 };
74
75 static const u8 ipv4_bcast_addr[] = {
76 0x00, 0xff, 0xff, 0xff,
77 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
78 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
79 };
80
81 struct workqueue_struct *ipoib_workqueue;
82
83 struct ib_sa_client ipoib_sa_client;
84
85 static void ipoib_add_one(struct ib_device *device);
86 static void ipoib_remove_one(struct ib_device *device);
87
88 static struct ib_client ipoib_client = {
89 .name = "ipoib",
90 .add = ipoib_add_one,
91 .remove = ipoib_remove_one
92 };
93
94 int ipoib_open(struct net_device *dev)
95 {
96 struct ipoib_dev_priv *priv = netdev_priv(dev);
97
98 ipoib_dbg(priv, "bringing up interface\n");
99
100 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
101
102 if (ipoib_pkey_dev_delay_open(dev))
103 return 0;
104
105 if (ipoib_ib_dev_open(dev))
106 goto err_disable;
107
108 if (ipoib_ib_dev_up(dev))
109 goto err_stop;
110
111 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
112 struct ipoib_dev_priv *cpriv;
113
114 /* Bring up any child interfaces too */
115 mutex_lock(&priv->vlan_mutex);
116 list_for_each_entry(cpriv, &priv->child_intfs, list) {
117 int flags;
118
119 flags = cpriv->dev->flags;
120 if (flags & IFF_UP)
121 continue;
122
123 dev_change_flags(cpriv->dev, flags | IFF_UP);
124 }
125 mutex_unlock(&priv->vlan_mutex);
126 }
127
128 netif_start_queue(dev);
129
130 return 0;
131
132 err_stop:
133 ipoib_ib_dev_stop(dev, 1);
134
135 err_disable:
136 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
137
138 return -EINVAL;
139 }
140
141 static int ipoib_stop(struct net_device *dev)
142 {
143 struct ipoib_dev_priv *priv = netdev_priv(dev);
144
145 ipoib_dbg(priv, "stopping interface\n");
146
147 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
148
149 netif_stop_queue(dev);
150
151 ipoib_ib_dev_down(dev, 0);
152 ipoib_ib_dev_stop(dev, 0);
153
154 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
155 struct ipoib_dev_priv *cpriv;
156
157 /* Bring down any child interfaces too */
158 mutex_lock(&priv->vlan_mutex);
159 list_for_each_entry(cpriv, &priv->child_intfs, list) {
160 int flags;
161
162 flags = cpriv->dev->flags;
163 if (!(flags & IFF_UP))
164 continue;
165
166 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
167 }
168 mutex_unlock(&priv->vlan_mutex);
169 }
170
171 return 0;
172 }
173
174 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
175 {
176 struct ipoib_dev_priv *priv = netdev_priv(dev);
177
178 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
179 features &= ~(NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO);
180
181 return features;
182 }
183
184 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
185 {
186 struct ipoib_dev_priv *priv = netdev_priv(dev);
187
188 /* dev->mtu > 2K ==> connected mode */
189 if (ipoib_cm_admin_enabled(dev)) {
190 if (new_mtu > ipoib_cm_max_mtu(dev))
191 return -EINVAL;
192
193 if (new_mtu > priv->mcast_mtu)
194 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
195 priv->mcast_mtu);
196
197 dev->mtu = new_mtu;
198 return 0;
199 }
200
201 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
202 return -EINVAL;
203
204 priv->admin_mtu = new_mtu;
205
206 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
207
208 return 0;
209 }
210
211 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
212 {
213 struct ipoib_dev_priv *priv = netdev_priv(dev);
214 struct rb_node *n = priv->path_tree.rb_node;
215 struct ipoib_path *path;
216 int ret;
217
218 while (n) {
219 path = rb_entry(n, struct ipoib_path, rb_node);
220
221 ret = memcmp(gid, path->pathrec.dgid.raw,
222 sizeof (union ib_gid));
223
224 if (ret < 0)
225 n = n->rb_left;
226 else if (ret > 0)
227 n = n->rb_right;
228 else
229 return path;
230 }
231
232 return NULL;
233 }
234
235 static int __path_add(struct net_device *dev, struct ipoib_path *path)
236 {
237 struct ipoib_dev_priv *priv = netdev_priv(dev);
238 struct rb_node **n = &priv->path_tree.rb_node;
239 struct rb_node *pn = NULL;
240 struct ipoib_path *tpath;
241 int ret;
242
243 while (*n) {
244 pn = *n;
245 tpath = rb_entry(pn, struct ipoib_path, rb_node);
246
247 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
248 sizeof (union ib_gid));
249 if (ret < 0)
250 n = &pn->rb_left;
251 else if (ret > 0)
252 n = &pn->rb_right;
253 else
254 return -EEXIST;
255 }
256
257 rb_link_node(&path->rb_node, pn, n);
258 rb_insert_color(&path->rb_node, &priv->path_tree);
259
260 list_add_tail(&path->list, &priv->path_list);
261
262 return 0;
263 }
264
265 static void path_free(struct net_device *dev, struct ipoib_path *path)
266 {
267 struct ipoib_dev_priv *priv = netdev_priv(dev);
268 struct ipoib_neigh *neigh, *tn;
269 struct sk_buff *skb;
270 unsigned long flags;
271
272 while ((skb = __skb_dequeue(&path->queue)))
273 dev_kfree_skb_irq(skb);
274
275 spin_lock_irqsave(&priv->lock, flags);
276
277 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
278 /*
279 * It's safe to call ipoib_put_ah() inside priv->lock
280 * here, because we know that path->ah will always
281 * hold one more reference, so ipoib_put_ah() will
282 * never do more than decrement the ref count.
283 */
284 if (neigh->ah)
285 ipoib_put_ah(neigh->ah);
286
287 ipoib_neigh_free(dev, neigh);
288 }
289
290 spin_unlock_irqrestore(&priv->lock, flags);
291
292 if (path->ah)
293 ipoib_put_ah(path->ah);
294
295 kfree(path);
296 }
297
298 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
299
300 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
301 {
302 struct ipoib_path_iter *iter;
303
304 iter = kmalloc(sizeof *iter, GFP_KERNEL);
305 if (!iter)
306 return NULL;
307
308 iter->dev = dev;
309 memset(iter->path.pathrec.dgid.raw, 0, 16);
310
311 if (ipoib_path_iter_next(iter)) {
312 kfree(iter);
313 return NULL;
314 }
315
316 return iter;
317 }
318
319 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
320 {
321 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
322 struct rb_node *n;
323 struct ipoib_path *path;
324 int ret = 1;
325
326 spin_lock_irq(&priv->lock);
327
328 n = rb_first(&priv->path_tree);
329
330 while (n) {
331 path = rb_entry(n, struct ipoib_path, rb_node);
332
333 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
334 sizeof (union ib_gid)) < 0) {
335 iter->path = *path;
336 ret = 0;
337 break;
338 }
339
340 n = rb_next(n);
341 }
342
343 spin_unlock_irq(&priv->lock);
344
345 return ret;
346 }
347
348 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
349 struct ipoib_path *path)
350 {
351 *path = iter->path;
352 }
353
354 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
355
356 void ipoib_mark_paths_invalid(struct net_device *dev)
357 {
358 struct ipoib_dev_priv *priv = netdev_priv(dev);
359 struct ipoib_path *path, *tp;
360
361 spin_lock_irq(&priv->lock);
362
363 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
364 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
365 be16_to_cpu(path->pathrec.dlid),
366 path->pathrec.dgid.raw);
367 path->valid = 0;
368 }
369
370 spin_unlock_irq(&priv->lock);
371 }
372
373 void ipoib_flush_paths(struct net_device *dev)
374 {
375 struct ipoib_dev_priv *priv = netdev_priv(dev);
376 struct ipoib_path *path, *tp;
377 LIST_HEAD(remove_list);
378 unsigned long flags;
379
380 netif_tx_lock_bh(dev);
381 spin_lock_irqsave(&priv->lock, flags);
382
383 list_splice_init(&priv->path_list, &remove_list);
384
385 list_for_each_entry(path, &remove_list, list)
386 rb_erase(&path->rb_node, &priv->path_tree);
387
388 list_for_each_entry_safe(path, tp, &remove_list, list) {
389 if (path->query)
390 ib_sa_cancel_query(path->query_id, path->query);
391 spin_unlock_irqrestore(&priv->lock, flags);
392 netif_tx_unlock_bh(dev);
393 wait_for_completion(&path->done);
394 path_free(dev, path);
395 netif_tx_lock_bh(dev);
396 spin_lock_irqsave(&priv->lock, flags);
397 }
398
399 spin_unlock_irqrestore(&priv->lock, flags);
400 netif_tx_unlock_bh(dev);
401 }
402
403 static void path_rec_completion(int status,
404 struct ib_sa_path_rec *pathrec,
405 void *path_ptr)
406 {
407 struct ipoib_path *path = path_ptr;
408 struct net_device *dev = path->dev;
409 struct ipoib_dev_priv *priv = netdev_priv(dev);
410 struct ipoib_ah *ah = NULL;
411 struct ipoib_ah *old_ah = NULL;
412 struct ipoib_neigh *neigh, *tn;
413 struct sk_buff_head skqueue;
414 struct sk_buff *skb;
415 unsigned long flags;
416
417 if (!status)
418 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
419 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
420 else
421 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
422 status, path->pathrec.dgid.raw);
423
424 skb_queue_head_init(&skqueue);
425
426 if (!status) {
427 struct ib_ah_attr av;
428
429 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
430 ah = ipoib_create_ah(dev, priv->pd, &av);
431 }
432
433 spin_lock_irqsave(&priv->lock, flags);
434
435 if (!IS_ERR_OR_NULL(ah)) {
436 path->pathrec = *pathrec;
437
438 old_ah = path->ah;
439 path->ah = ah;
440
441 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
442 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
443
444 while ((skb = __skb_dequeue(&path->queue)))
445 __skb_queue_tail(&skqueue, skb);
446
447 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
448 if (neigh->ah) {
449 WARN_ON(neigh->ah != old_ah);
450 /*
451 * Dropping the ah reference inside
452 * priv->lock is safe here, because we
453 * will hold one more reference from
454 * the original value of path->ah (ie
455 * old_ah).
456 */
457 ipoib_put_ah(neigh->ah);
458 }
459 kref_get(&path->ah->ref);
460 neigh->ah = path->ah;
461 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
462 sizeof(union ib_gid));
463
464 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
465 if (!ipoib_cm_get(neigh))
466 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
467 path,
468 neigh));
469 if (!ipoib_cm_get(neigh)) {
470 list_del(&neigh->list);
471 if (neigh->ah)
472 ipoib_put_ah(neigh->ah);
473 ipoib_neigh_free(dev, neigh);
474 continue;
475 }
476 }
477
478 while ((skb = __skb_dequeue(&neigh->queue)))
479 __skb_queue_tail(&skqueue, skb);
480 }
481 path->valid = 1;
482 }
483
484 path->query = NULL;
485 complete(&path->done);
486
487 spin_unlock_irqrestore(&priv->lock, flags);
488
489 if (old_ah)
490 ipoib_put_ah(old_ah);
491
492 while ((skb = __skb_dequeue(&skqueue))) {
493 skb->dev = dev;
494 if (dev_queue_xmit(skb))
495 ipoib_warn(priv, "dev_queue_xmit failed "
496 "to requeue packet\n");
497 }
498 }
499
500 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
501 {
502 struct ipoib_dev_priv *priv = netdev_priv(dev);
503 struct ipoib_path *path;
504
505 if (!priv->broadcast)
506 return NULL;
507
508 path = kzalloc(sizeof *path, GFP_ATOMIC);
509 if (!path)
510 return NULL;
511
512 path->dev = dev;
513
514 skb_queue_head_init(&path->queue);
515
516 INIT_LIST_HEAD(&path->neigh_list);
517
518 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
519 path->pathrec.sgid = priv->local_gid;
520 path->pathrec.pkey = cpu_to_be16(priv->pkey);
521 path->pathrec.numb_path = 1;
522 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
523
524 return path;
525 }
526
527 static int path_rec_start(struct net_device *dev,
528 struct ipoib_path *path)
529 {
530 struct ipoib_dev_priv *priv = netdev_priv(dev);
531
532 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
533 path->pathrec.dgid.raw);
534
535 init_completion(&path->done);
536
537 path->query_id =
538 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
539 &path->pathrec,
540 IB_SA_PATH_REC_DGID |
541 IB_SA_PATH_REC_SGID |
542 IB_SA_PATH_REC_NUMB_PATH |
543 IB_SA_PATH_REC_TRAFFIC_CLASS |
544 IB_SA_PATH_REC_PKEY,
545 1000, GFP_ATOMIC,
546 path_rec_completion,
547 path, &path->query);
548 if (path->query_id < 0) {
549 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
550 path->query = NULL;
551 complete(&path->done);
552 return path->query_id;
553 }
554
555 return 0;
556 }
557
558 /* called with rcu_read_lock */
559 static void neigh_add_path(struct sk_buff *skb, struct neighbour *n, struct net_device *dev)
560 {
561 struct ipoib_dev_priv *priv = netdev_priv(dev);
562 struct ipoib_path *path;
563 struct ipoib_neigh *neigh;
564 unsigned long flags;
565
566 neigh = ipoib_neigh_alloc(n, skb->dev);
567 if (!neigh) {
568 ++dev->stats.tx_dropped;
569 dev_kfree_skb_any(skb);
570 return;
571 }
572
573 spin_lock_irqsave(&priv->lock, flags);
574
575 path = __path_find(dev, n->ha + 4);
576 if (!path) {
577 path = path_rec_create(dev, n->ha + 4);
578 if (!path)
579 goto err_path;
580
581 __path_add(dev, path);
582 }
583
584 list_add_tail(&neigh->list, &path->neigh_list);
585
586 if (path->ah) {
587 kref_get(&path->ah->ref);
588 neigh->ah = path->ah;
589 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
590 sizeof(union ib_gid));
591
592 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
593 if (!ipoib_cm_get(neigh))
594 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
595 if (!ipoib_cm_get(neigh)) {
596 list_del(&neigh->list);
597 if (neigh->ah)
598 ipoib_put_ah(neigh->ah);
599 ipoib_neigh_free(dev, neigh);
600 goto err_drop;
601 }
602 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
603 __skb_queue_tail(&neigh->queue, skb);
604 else {
605 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
606 skb_queue_len(&neigh->queue));
607 goto err_drop;
608 }
609 } else {
610 spin_unlock_irqrestore(&priv->lock, flags);
611 ipoib_send(dev, skb, path->ah, IPOIB_QPN(n->ha));
612 return;
613 }
614 } else {
615 neigh->ah = NULL;
616
617 if (!path->query && path_rec_start(dev, path))
618 goto err_list;
619
620 __skb_queue_tail(&neigh->queue, skb);
621 }
622
623 spin_unlock_irqrestore(&priv->lock, flags);
624 return;
625
626 err_list:
627 list_del(&neigh->list);
628
629 err_path:
630 ipoib_neigh_free(dev, neigh);
631 err_drop:
632 ++dev->stats.tx_dropped;
633 dev_kfree_skb_any(skb);
634
635 spin_unlock_irqrestore(&priv->lock, flags);
636 }
637
638 /* called with rcu_read_lock */
639 static void ipoib_path_lookup(struct sk_buff *skb, struct neighbour *n, struct net_device *dev)
640 {
641 struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
642
643 /* Look up path record for unicasts */
644 if (n->ha[4] != 0xff) {
645 neigh_add_path(skb, n, dev);
646 return;
647 }
648
649 /* Add in the P_Key for multicasts */
650 n->ha[8] = (priv->pkey >> 8) & 0xff;
651 n->ha[9] = priv->pkey & 0xff;
652 ipoib_mcast_send(dev, n->ha + 4, skb);
653 }
654
655 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
656 struct ipoib_cb *cb)
657 {
658 struct ipoib_dev_priv *priv = netdev_priv(dev);
659 struct ipoib_path *path;
660 unsigned long flags;
661
662 spin_lock_irqsave(&priv->lock, flags);
663
664 path = __path_find(dev, cb->hwaddr + 4);
665 if (!path || !path->valid) {
666 int new_path = 0;
667
668 if (!path) {
669 path = path_rec_create(dev, cb->hwaddr + 4);
670 new_path = 1;
671 }
672 if (path) {
673 __skb_queue_tail(&path->queue, skb);
674
675 if (!path->query && path_rec_start(dev, path)) {
676 spin_unlock_irqrestore(&priv->lock, flags);
677 if (new_path)
678 path_free(dev, path);
679 return;
680 } else
681 __path_add(dev, path);
682 } else {
683 ++dev->stats.tx_dropped;
684 dev_kfree_skb_any(skb);
685 }
686
687 spin_unlock_irqrestore(&priv->lock, flags);
688 return;
689 }
690
691 if (path->ah) {
692 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
693 be16_to_cpu(path->pathrec.dlid));
694
695 spin_unlock_irqrestore(&priv->lock, flags);
696 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
697 return;
698 } else if ((path->query || !path_rec_start(dev, path)) &&
699 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
700 __skb_queue_tail(&path->queue, skb);
701 } else {
702 ++dev->stats.tx_dropped;
703 dev_kfree_skb_any(skb);
704 }
705
706 spin_unlock_irqrestore(&priv->lock, flags);
707 }
708
709 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
710 {
711 struct ipoib_dev_priv *priv = netdev_priv(dev);
712 struct ipoib_neigh *neigh;
713 struct neighbour *n = NULL;
714 unsigned long flags;
715
716 rcu_read_lock();
717 if (likely(skb_dst(skb))) {
718 n = dst_neigh_lookup_skb(skb_dst(skb), skb);
719 if (!n) {
720 ++dev->stats.tx_dropped;
721 dev_kfree_skb_any(skb);
722 goto unlock;
723 }
724 }
725 if (likely(n)) {
726 if (unlikely(!*to_ipoib_neigh(n))) {
727 ipoib_path_lookup(skb, n, dev);
728 goto unlock;
729 }
730
731 neigh = *to_ipoib_neigh(n);
732
733 if (unlikely((memcmp(&neigh->dgid.raw,
734 n->ha + 4,
735 sizeof(union ib_gid))) ||
736 (neigh->dev != dev))) {
737 spin_lock_irqsave(&priv->lock, flags);
738 /*
739 * It's safe to call ipoib_put_ah() inside
740 * priv->lock here, because we know that
741 * path->ah will always hold one more reference,
742 * so ipoib_put_ah() will never do more than
743 * decrement the ref count.
744 */
745 if (neigh->ah)
746 ipoib_put_ah(neigh->ah);
747 list_del(&neigh->list);
748 ipoib_neigh_free(dev, neigh);
749 spin_unlock_irqrestore(&priv->lock, flags);
750 ipoib_path_lookup(skb, n, dev);
751 goto unlock;
752 }
753
754 if (ipoib_cm_get(neigh)) {
755 if (ipoib_cm_up(neigh)) {
756 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
757 goto unlock;
758 }
759 } else if (neigh->ah) {
760 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(n->ha));
761 goto unlock;
762 }
763
764 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
765 spin_lock_irqsave(&priv->lock, flags);
766 __skb_queue_tail(&neigh->queue, skb);
767 spin_unlock_irqrestore(&priv->lock, flags);
768 } else {
769 ++dev->stats.tx_dropped;
770 dev_kfree_skb_any(skb);
771 }
772 } else {
773 struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
774
775 if (cb->hwaddr[4] == 0xff) {
776 /* Add in the P_Key for multicast*/
777 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
778 cb->hwaddr[9] = priv->pkey & 0xff;
779
780 ipoib_mcast_send(dev, cb->hwaddr + 4, skb);
781 } else {
782 /* unicast GID -- should be ARP or RARP reply */
783
784 if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
785 (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
786 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x %pI6\n",
787 skb_dst(skb) ? "neigh" : "dst",
788 be16_to_cpup((__be16 *) skb->data),
789 IPOIB_QPN(cb->hwaddr),
790 cb->hwaddr + 4);
791 dev_kfree_skb_any(skb);
792 ++dev->stats.tx_dropped;
793 goto unlock;
794 }
795
796 unicast_arp_send(skb, dev, cb);
797 }
798 }
799 unlock:
800 if (n)
801 neigh_release(n);
802 rcu_read_unlock();
803 return NETDEV_TX_OK;
804 }
805
806 static void ipoib_timeout(struct net_device *dev)
807 {
808 struct ipoib_dev_priv *priv = netdev_priv(dev);
809
810 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
811 jiffies_to_msecs(jiffies - dev->trans_start));
812 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
813 netif_queue_stopped(dev),
814 priv->tx_head, priv->tx_tail);
815 /* XXX reset QP, etc. */
816 }
817
818 static int ipoib_hard_header(struct sk_buff *skb,
819 struct net_device *dev,
820 unsigned short type,
821 const void *daddr, const void *saddr, unsigned len)
822 {
823 struct ipoib_header *header;
824
825 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
826
827 header->proto = htons(type);
828 header->reserved = 0;
829
830 /*
831 * If we don't have a dst_entry structure, stuff the
832 * destination address into skb->cb so we can figure out where
833 * to send the packet later.
834 */
835 if (!skb_dst(skb)) {
836 struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
837 memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
838 }
839
840 return 0;
841 }
842
843 static void ipoib_set_mcast_list(struct net_device *dev)
844 {
845 struct ipoib_dev_priv *priv = netdev_priv(dev);
846
847 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
848 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
849 return;
850 }
851
852 queue_work(ipoib_workqueue, &priv->restart_task);
853 }
854
855 static void ipoib_neigh_cleanup(struct neighbour *n)
856 {
857 struct ipoib_neigh *neigh;
858 struct ipoib_dev_priv *priv = netdev_priv(n->dev);
859 unsigned long flags;
860 struct ipoib_ah *ah = NULL;
861
862 neigh = *to_ipoib_neigh(n);
863 if (neigh)
864 priv = netdev_priv(neigh->dev);
865 else
866 return;
867 ipoib_dbg(priv,
868 "neigh_cleanup for %06x %pI6\n",
869 IPOIB_QPN(n->ha),
870 n->ha + 4);
871
872 spin_lock_irqsave(&priv->lock, flags);
873
874 if (neigh->ah)
875 ah = neigh->ah;
876 list_del(&neigh->list);
877 ipoib_neigh_free(n->dev, neigh);
878
879 spin_unlock_irqrestore(&priv->lock, flags);
880
881 if (ah)
882 ipoib_put_ah(ah);
883 }
884
885 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
886 struct net_device *dev)
887 {
888 struct ipoib_neigh *neigh;
889
890 neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
891 if (!neigh)
892 return NULL;
893
894 neigh->neighbour = neighbour;
895 neigh->dev = dev;
896 memset(&neigh->dgid.raw, 0, sizeof (union ib_gid));
897 *to_ipoib_neigh(neighbour) = neigh;
898 skb_queue_head_init(&neigh->queue);
899 ipoib_cm_set(neigh, NULL);
900
901 return neigh;
902 }
903
904 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
905 {
906 struct sk_buff *skb;
907 *to_ipoib_neigh(neigh->neighbour) = NULL;
908 while ((skb = __skb_dequeue(&neigh->queue))) {
909 ++dev->stats.tx_dropped;
910 dev_kfree_skb_any(skb);
911 }
912 if (ipoib_cm_get(neigh))
913 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
914 kfree(neigh);
915 }
916
917 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
918 {
919 parms->neigh_cleanup = ipoib_neigh_cleanup;
920
921 return 0;
922 }
923
924 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
925 {
926 struct ipoib_dev_priv *priv = netdev_priv(dev);
927
928 /* Allocate RX/TX "rings" to hold queued skbs */
929 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
930 GFP_KERNEL);
931 if (!priv->rx_ring) {
932 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
933 ca->name, ipoib_recvq_size);
934 goto out;
935 }
936
937 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
938 if (!priv->tx_ring) {
939 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
940 ca->name, ipoib_sendq_size);
941 goto out_rx_ring_cleanup;
942 }
943
944 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
945
946 if (ipoib_ib_dev_init(dev, ca, port))
947 goto out_tx_ring_cleanup;
948
949 return 0;
950
951 out_tx_ring_cleanup:
952 vfree(priv->tx_ring);
953
954 out_rx_ring_cleanup:
955 kfree(priv->rx_ring);
956
957 out:
958 return -ENOMEM;
959 }
960
961 void ipoib_dev_cleanup(struct net_device *dev)
962 {
963 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
964
965 ipoib_delete_debug_files(dev);
966
967 /* Delete any child interfaces first */
968 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
969 unregister_netdev(cpriv->dev);
970 ipoib_dev_cleanup(cpriv->dev);
971 free_netdev(cpriv->dev);
972 }
973
974 ipoib_ib_dev_cleanup(dev);
975
976 kfree(priv->rx_ring);
977 vfree(priv->tx_ring);
978
979 priv->rx_ring = NULL;
980 priv->tx_ring = NULL;
981 }
982
983 static const struct header_ops ipoib_header_ops = {
984 .create = ipoib_hard_header,
985 };
986
987 static const struct net_device_ops ipoib_netdev_ops = {
988 .ndo_open = ipoib_open,
989 .ndo_stop = ipoib_stop,
990 .ndo_change_mtu = ipoib_change_mtu,
991 .ndo_fix_features = ipoib_fix_features,
992 .ndo_start_xmit = ipoib_start_xmit,
993 .ndo_tx_timeout = ipoib_timeout,
994 .ndo_set_rx_mode = ipoib_set_mcast_list,
995 .ndo_neigh_setup = ipoib_neigh_setup_dev,
996 };
997
998 static void ipoib_setup(struct net_device *dev)
999 {
1000 struct ipoib_dev_priv *priv = netdev_priv(dev);
1001
1002 dev->netdev_ops = &ipoib_netdev_ops;
1003 dev->header_ops = &ipoib_header_ops;
1004
1005 ipoib_set_ethtool_ops(dev);
1006
1007 netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1008
1009 dev->watchdog_timeo = HZ;
1010
1011 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
1012
1013 dev->hard_header_len = IPOIB_ENCAP_LEN;
1014 dev->addr_len = INFINIBAND_ALEN;
1015 dev->type = ARPHRD_INFINIBAND;
1016 dev->tx_queue_len = ipoib_sendq_size * 2;
1017 dev->features = (NETIF_F_VLAN_CHALLENGED |
1018 NETIF_F_HIGHDMA);
1019 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1020
1021 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1022
1023 netif_carrier_off(dev);
1024
1025 priv->dev = dev;
1026
1027 spin_lock_init(&priv->lock);
1028
1029 mutex_init(&priv->vlan_mutex);
1030
1031 INIT_LIST_HEAD(&priv->path_list);
1032 INIT_LIST_HEAD(&priv->child_intfs);
1033 INIT_LIST_HEAD(&priv->dead_ahs);
1034 INIT_LIST_HEAD(&priv->multicast_list);
1035
1036 INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1037 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1038 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1039 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
1040 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
1041 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
1042 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1043 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1044 }
1045
1046 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1047 {
1048 struct net_device *dev;
1049
1050 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1051 ipoib_setup);
1052 if (!dev)
1053 return NULL;
1054
1055 return netdev_priv(dev);
1056 }
1057
1058 static ssize_t show_pkey(struct device *dev,
1059 struct device_attribute *attr, char *buf)
1060 {
1061 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1062
1063 return sprintf(buf, "0x%04x\n", priv->pkey);
1064 }
1065 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1066
1067 static ssize_t show_umcast(struct device *dev,
1068 struct device_attribute *attr, char *buf)
1069 {
1070 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1071
1072 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1073 }
1074
1075 static ssize_t set_umcast(struct device *dev,
1076 struct device_attribute *attr,
1077 const char *buf, size_t count)
1078 {
1079 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1080 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1081
1082 if (umcast_val > 0) {
1083 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1084 ipoib_warn(priv, "ignoring multicast groups joined directly "
1085 "by userspace\n");
1086 } else
1087 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1088
1089 return count;
1090 }
1091 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1092
1093 int ipoib_add_umcast_attr(struct net_device *dev)
1094 {
1095 return device_create_file(&dev->dev, &dev_attr_umcast);
1096 }
1097
1098 static ssize_t create_child(struct device *dev,
1099 struct device_attribute *attr,
1100 const char *buf, size_t count)
1101 {
1102 int pkey;
1103 int ret;
1104
1105 if (sscanf(buf, "%i", &pkey) != 1)
1106 return -EINVAL;
1107
1108 if (pkey < 0 || pkey > 0xffff)
1109 return -EINVAL;
1110
1111 /*
1112 * Set the full membership bit, so that we join the right
1113 * broadcast group, etc.
1114 */
1115 pkey |= 0x8000;
1116
1117 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1118
1119 return ret ? ret : count;
1120 }
1121 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1122
1123 static ssize_t delete_child(struct device *dev,
1124 struct device_attribute *attr,
1125 const char *buf, size_t count)
1126 {
1127 int pkey;
1128 int ret;
1129
1130 if (sscanf(buf, "%i", &pkey) != 1)
1131 return -EINVAL;
1132
1133 if (pkey < 0 || pkey > 0xffff)
1134 return -EINVAL;
1135
1136 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1137
1138 return ret ? ret : count;
1139
1140 }
1141 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1142
1143 int ipoib_add_pkey_attr(struct net_device *dev)
1144 {
1145 return device_create_file(&dev->dev, &dev_attr_pkey);
1146 }
1147
1148 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1149 {
1150 struct ib_device_attr *device_attr;
1151 int result = -ENOMEM;
1152
1153 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1154 if (!device_attr) {
1155 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1156 hca->name, sizeof *device_attr);
1157 return result;
1158 }
1159
1160 result = ib_query_device(hca, device_attr);
1161 if (result) {
1162 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1163 hca->name, result);
1164 kfree(device_attr);
1165 return result;
1166 }
1167 priv->hca_caps = device_attr->device_cap_flags;
1168
1169 kfree(device_attr);
1170
1171 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1172 priv->dev->hw_features = NETIF_F_SG |
1173 NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1174
1175 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1176 priv->dev->hw_features |= NETIF_F_TSO;
1177
1178 priv->dev->features |= priv->dev->hw_features;
1179 }
1180
1181 return 0;
1182 }
1183
1184 static struct net_device *ipoib_add_port(const char *format,
1185 struct ib_device *hca, u8 port)
1186 {
1187 struct ipoib_dev_priv *priv;
1188 struct ib_port_attr attr;
1189 int result = -ENOMEM;
1190
1191 priv = ipoib_intf_alloc(format);
1192 if (!priv)
1193 goto alloc_mem_failed;
1194
1195 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1196 priv->dev->dev_id = port - 1;
1197
1198 if (!ib_query_port(hca, port, &attr))
1199 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1200 else {
1201 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1202 hca->name, port);
1203 goto device_init_failed;
1204 }
1205
1206 /* MTU will be reset when mcast join happens */
1207 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1208 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
1209
1210 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1211
1212 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1213 if (result) {
1214 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1215 hca->name, port, result);
1216 goto device_init_failed;
1217 }
1218
1219 if (ipoib_set_dev_features(priv, hca))
1220 goto device_init_failed;
1221
1222 /*
1223 * Set the full membership bit, so that we join the right
1224 * broadcast group, etc.
1225 */
1226 priv->pkey |= 0x8000;
1227
1228 priv->dev->broadcast[8] = priv->pkey >> 8;
1229 priv->dev->broadcast[9] = priv->pkey & 0xff;
1230
1231 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1232 if (result) {
1233 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1234 hca->name, port, result);
1235 goto device_init_failed;
1236 } else
1237 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1238
1239 result = ipoib_dev_init(priv->dev, hca, port);
1240 if (result < 0) {
1241 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1242 hca->name, port, result);
1243 goto device_init_failed;
1244 }
1245
1246 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1247 priv->ca, ipoib_event);
1248 result = ib_register_event_handler(&priv->event_handler);
1249 if (result < 0) {
1250 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1251 "port %d (ret = %d)\n",
1252 hca->name, port, result);
1253 goto event_failed;
1254 }
1255
1256 result = register_netdev(priv->dev);
1257 if (result) {
1258 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1259 hca->name, port, result);
1260 goto register_failed;
1261 }
1262
1263 ipoib_create_debug_files(priv->dev);
1264
1265 if (ipoib_cm_add_mode_attr(priv->dev))
1266 goto sysfs_failed;
1267 if (ipoib_add_pkey_attr(priv->dev))
1268 goto sysfs_failed;
1269 if (ipoib_add_umcast_attr(priv->dev))
1270 goto sysfs_failed;
1271 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1272 goto sysfs_failed;
1273 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1274 goto sysfs_failed;
1275
1276 return priv->dev;
1277
1278 sysfs_failed:
1279 ipoib_delete_debug_files(priv->dev);
1280 unregister_netdev(priv->dev);
1281
1282 register_failed:
1283 ib_unregister_event_handler(&priv->event_handler);
1284 flush_workqueue(ipoib_workqueue);
1285
1286 event_failed:
1287 ipoib_dev_cleanup(priv->dev);
1288
1289 device_init_failed:
1290 free_netdev(priv->dev);
1291
1292 alloc_mem_failed:
1293 return ERR_PTR(result);
1294 }
1295
1296 static void ipoib_add_one(struct ib_device *device)
1297 {
1298 struct list_head *dev_list;
1299 struct net_device *dev;
1300 struct ipoib_dev_priv *priv;
1301 int s, e, p;
1302
1303 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1304 return;
1305
1306 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1307 if (!dev_list)
1308 return;
1309
1310 INIT_LIST_HEAD(dev_list);
1311
1312 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1313 s = 0;
1314 e = 0;
1315 } else {
1316 s = 1;
1317 e = device->phys_port_cnt;
1318 }
1319
1320 for (p = s; p <= e; ++p) {
1321 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1322 continue;
1323 dev = ipoib_add_port("ib%d", device, p);
1324 if (!IS_ERR(dev)) {
1325 priv = netdev_priv(dev);
1326 list_add_tail(&priv->list, dev_list);
1327 }
1328 }
1329
1330 ib_set_client_data(device, &ipoib_client, dev_list);
1331 }
1332
1333 static void ipoib_remove_one(struct ib_device *device)
1334 {
1335 struct ipoib_dev_priv *priv, *tmp;
1336 struct list_head *dev_list;
1337
1338 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1339 return;
1340
1341 dev_list = ib_get_client_data(device, &ipoib_client);
1342
1343 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1344 ib_unregister_event_handler(&priv->event_handler);
1345
1346 rtnl_lock();
1347 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1348 rtnl_unlock();
1349
1350 flush_workqueue(ipoib_workqueue);
1351
1352 unregister_netdev(priv->dev);
1353 ipoib_dev_cleanup(priv->dev);
1354 free_netdev(priv->dev);
1355 }
1356
1357 kfree(dev_list);
1358 }
1359
1360 static int __init ipoib_init_module(void)
1361 {
1362 int ret;
1363
1364 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1365 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1366 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1367
1368 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1369 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1370 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1371 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1372 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1373 #endif
1374
1375 /*
1376 * When copying small received packets, we only copy from the
1377 * linear data part of the SKB, so we rely on this condition.
1378 */
1379 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1380
1381 ret = ipoib_register_debugfs();
1382 if (ret)
1383 return ret;
1384
1385 /*
1386 * We create our own workqueue mainly because we want to be
1387 * able to flush it when devices are being removed. We can't
1388 * use schedule_work()/flush_scheduled_work() because both
1389 * unregister_netdev() and linkwatch_event take the rtnl lock,
1390 * so flush_scheduled_work() can deadlock during device
1391 * removal.
1392 */
1393 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1394 if (!ipoib_workqueue) {
1395 ret = -ENOMEM;
1396 goto err_fs;
1397 }
1398
1399 ib_sa_register_client(&ipoib_sa_client);
1400
1401 ret = ib_register_client(&ipoib_client);
1402 if (ret)
1403 goto err_sa;
1404
1405 return 0;
1406
1407 err_sa:
1408 ib_sa_unregister_client(&ipoib_sa_client);
1409 destroy_workqueue(ipoib_workqueue);
1410
1411 err_fs:
1412 ipoib_unregister_debugfs();
1413
1414 return ret;
1415 }
1416
1417 static void __exit ipoib_cleanup_module(void)
1418 {
1419 ib_unregister_client(&ipoib_client);
1420 ib_sa_unregister_client(&ipoib_sa_client);
1421 ipoib_unregister_debugfs();
1422 destroy_workqueue(ipoib_workqueue);
1423 }
1424
1425 module_init(ipoib_init_module);
1426 module_exit(ipoib_cleanup_module);
Linux kernel - Deliverables
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