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IPoIB: Fix loss of connectivity after bonding failover on both sides
[linux-2.6/libata-dev.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
blobdce0443f9d693d0396766b657d313169ef652245
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 static int lro;
64 module_param(lro, bool, 0444);
65 MODULE_PARM_DESC(lro, "Enable LRO (Large Receive Offload)");
66
67 static int lro_max_aggr = IPOIB_LRO_MAX_AGGR;
68 module_param(lro_max_aggr, int, 0644);
69 MODULE_PARM_DESC(lro_max_aggr, "LRO: Max packets to be aggregated "
70 "(default = 64)");
71
72 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
73 int ipoib_debug_level;
74
75 module_param_named(debug_level, ipoib_debug_level, int, 0644);
76 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
77 #endif
78
79 struct ipoib_path_iter {
80 struct net_device *dev;
81 struct ipoib_path path;
82 };
83
84 static const u8 ipv4_bcast_addr[] = {
85 0x00, 0xff, 0xff, 0xff,
86 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
87 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
88 };
89
90 struct workqueue_struct *ipoib_workqueue;
91
92 struct ib_sa_client ipoib_sa_client;
93
94 static void ipoib_add_one(struct ib_device *device);
95 static void ipoib_remove_one(struct ib_device *device);
96
97 static struct ib_client ipoib_client = {
98 .name = "ipoib",
99 .add = ipoib_add_one,
100 .remove = ipoib_remove_one
101 };
102
103 int ipoib_open(struct net_device *dev)
104 {
105 struct ipoib_dev_priv *priv = netdev_priv(dev);
106
107 ipoib_dbg(priv, "bringing up interface\n");
108
109 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
110
111 if (ipoib_pkey_dev_delay_open(dev))
112 return 0;
113
114 napi_enable(&priv->napi);
115
116 if (ipoib_ib_dev_open(dev)) {
117 napi_disable(&priv->napi);
118 return -EINVAL;
119 }
120
121 if (ipoib_ib_dev_up(dev)) {
122 ipoib_ib_dev_stop(dev, 1);
123 napi_disable(&priv->napi);
124 return -EINVAL;
125 }
126
127 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
128 struct ipoib_dev_priv *cpriv;
129
130 /* Bring up any child interfaces too */
131 mutex_lock(&priv->vlan_mutex);
132 list_for_each_entry(cpriv, &priv->child_intfs, list) {
133 int flags;
134
135 flags = cpriv->dev->flags;
136 if (flags & IFF_UP)
137 continue;
138
139 dev_change_flags(cpriv->dev, flags | IFF_UP);
140 }
141 mutex_unlock(&priv->vlan_mutex);
142 }
143
144 netif_start_queue(dev);
145
146 return 0;
147 }
148
149 static int ipoib_stop(struct net_device *dev)
150 {
151 struct ipoib_dev_priv *priv = netdev_priv(dev);
152
153 ipoib_dbg(priv, "stopping interface\n");
154
155 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
156 napi_disable(&priv->napi);
157
158 netif_stop_queue(dev);
159
160 ipoib_ib_dev_down(dev, 0);
161 ipoib_ib_dev_stop(dev, 0);
162
163 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
164 struct ipoib_dev_priv *cpriv;
165
166 /* Bring down any child interfaces too */
167 mutex_lock(&priv->vlan_mutex);
168 list_for_each_entry(cpriv, &priv->child_intfs, list) {
169 int flags;
170
171 flags = cpriv->dev->flags;
172 if (!(flags & IFF_UP))
173 continue;
174
175 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
176 }
177 mutex_unlock(&priv->vlan_mutex);
178 }
179
180 return 0;
181 }
182
183 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
184 {
185 struct ipoib_dev_priv *priv = netdev_priv(dev);
186
187 /* dev->mtu > 2K ==> connected mode */
188 if (ipoib_cm_admin_enabled(dev)) {
189 if (new_mtu > ipoib_cm_max_mtu(dev))
190 return -EINVAL;
191
192 if (new_mtu > priv->mcast_mtu)
193 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
194 priv->mcast_mtu);
195
196 dev->mtu = new_mtu;
197 return 0;
198 }
199
200 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
201 return -EINVAL;
202
203 priv->admin_mtu = new_mtu;
204
205 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
206
207 return 0;
208 }
209
210 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
211 {
212 struct ipoib_dev_priv *priv = netdev_priv(dev);
213 struct rb_node *n = priv->path_tree.rb_node;
214 struct ipoib_path *path;
215 int ret;
216
217 while (n) {
218 path = rb_entry(n, struct ipoib_path, rb_node);
219
220 ret = memcmp(gid, path->pathrec.dgid.raw,
221 sizeof (union ib_gid));
222
223 if (ret < 0)
224 n = n->rb_left;
225 else if (ret > 0)
226 n = n->rb_right;
227 else
228 return path;
229 }
230
231 return NULL;
232 }
233
234 static int __path_add(struct net_device *dev, struct ipoib_path *path)
235 {
236 struct ipoib_dev_priv *priv = netdev_priv(dev);
237 struct rb_node **n = &priv->path_tree.rb_node;
238 struct rb_node *pn = NULL;
239 struct ipoib_path *tpath;
240 int ret;
241
242 while (*n) {
243 pn = *n;
244 tpath = rb_entry(pn, struct ipoib_path, rb_node);
245
246 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
247 sizeof (union ib_gid));
248 if (ret < 0)
249 n = &pn->rb_left;
250 else if (ret > 0)
251 n = &pn->rb_right;
252 else
253 return -EEXIST;
254 }
255
256 rb_link_node(&path->rb_node, pn, n);
257 rb_insert_color(&path->rb_node, &priv->path_tree);
258
259 list_add_tail(&path->list, &priv->path_list);
260
261 return 0;
262 }
263
264 static void path_free(struct net_device *dev, struct ipoib_path *path)
265 {
266 struct ipoib_dev_priv *priv = netdev_priv(dev);
267 struct ipoib_neigh *neigh, *tn;
268 struct sk_buff *skb;
269 unsigned long flags;
270
271 while ((skb = __skb_dequeue(&path->queue)))
272 dev_kfree_skb_irq(skb);
273
274 spin_lock_irqsave(&priv->lock, flags);
275
276 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
277 /*
278 * It's safe to call ipoib_put_ah() inside priv->lock
279 * here, because we know that path->ah will always
280 * hold one more reference, so ipoib_put_ah() will
281 * never do more than decrement the ref count.
282 */
283 if (neigh->ah)
284 ipoib_put_ah(neigh->ah);
285
286 ipoib_neigh_free(dev, neigh);
287 }
288
289 spin_unlock_irqrestore(&priv->lock, flags);
290
291 if (path->ah)
292 ipoib_put_ah(path->ah);
293
294 kfree(path);
295 }
296
297 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
298
299 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
300 {
301 struct ipoib_path_iter *iter;
302
303 iter = kmalloc(sizeof *iter, GFP_KERNEL);
304 if (!iter)
305 return NULL;
306
307 iter->dev = dev;
308 memset(iter->path.pathrec.dgid.raw, 0, 16);
309
310 if (ipoib_path_iter_next(iter)) {
311 kfree(iter);
312 return NULL;
313 }
314
315 return iter;
316 }
317
318 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
319 {
320 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
321 struct rb_node *n;
322 struct ipoib_path *path;
323 int ret = 1;
324
325 spin_lock_irq(&priv->lock);
326
327 n = rb_first(&priv->path_tree);
328
329 while (n) {
330 path = rb_entry(n, struct ipoib_path, rb_node);
331
332 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
333 sizeof (union ib_gid)) < 0) {
334 iter->path = *path;
335 ret = 0;
336 break;
337 }
338
339 n = rb_next(n);
340 }
341
342 spin_unlock_irq(&priv->lock);
343
344 return ret;
345 }
346
347 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
348 struct ipoib_path *path)
349 {
350 *path = iter->path;
351 }
352
353 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
354
355 void ipoib_mark_paths_invalid(struct net_device *dev)
356 {
357 struct ipoib_dev_priv *priv = netdev_priv(dev);
358 struct ipoib_path *path, *tp;
359
360 spin_lock_irq(&priv->lock);
361
362 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
363 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
364 be16_to_cpu(path->pathrec.dlid),
365 path->pathrec.dgid.raw);
366 path->valid = 0;
367 }
368
369 spin_unlock_irq(&priv->lock);
370 }
371
372 void ipoib_flush_paths(struct net_device *dev)
373 {
374 struct ipoib_dev_priv *priv = netdev_priv(dev);
375 struct ipoib_path *path, *tp;
376 LIST_HEAD(remove_list);
377 unsigned long flags;
378
379 netif_tx_lock_bh(dev);
380 spin_lock_irqsave(&priv->lock, flags);
381
382 list_splice_init(&priv->path_list, &remove_list);
383
384 list_for_each_entry(path, &remove_list, list)
385 rb_erase(&path->rb_node, &priv->path_tree);
386
387 list_for_each_entry_safe(path, tp, &remove_list, list) {
388 if (path->query)
389 ib_sa_cancel_query(path->query_id, path->query);
390 spin_unlock_irqrestore(&priv->lock, flags);
391 netif_tx_unlock_bh(dev);
392 wait_for_completion(&path->done);
393 path_free(dev, path);
394 netif_tx_lock_bh(dev);
395 spin_lock_irqsave(&priv->lock, flags);
396 }
397
398 spin_unlock_irqrestore(&priv->lock, flags);
399 netif_tx_unlock_bh(dev);
400 }
401
402 static void path_rec_completion(int status,
403 struct ib_sa_path_rec *pathrec,
404 void *path_ptr)
405 {
406 struct ipoib_path *path = path_ptr;
407 struct net_device *dev = path->dev;
408 struct ipoib_dev_priv *priv = netdev_priv(dev);
409 struct ipoib_ah *ah = NULL;
410 struct ipoib_ah *old_ah = NULL;
411 struct ipoib_neigh *neigh, *tn;
412 struct sk_buff_head skqueue;
413 struct sk_buff *skb;
414 unsigned long flags;
415
416 if (!status)
417 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
418 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
419 else
420 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
421 status, path->pathrec.dgid.raw);
422
423 skb_queue_head_init(&skqueue);
424
425 if (!status) {
426 struct ib_ah_attr av;
427
428 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
429 ah = ipoib_create_ah(dev, priv->pd, &av);
430 }
431
432 spin_lock_irqsave(&priv->lock, flags);
433
434 if (ah) {
435 path->pathrec = *pathrec;
436
437 old_ah = path->ah;
438 path->ah = ah;
439
440 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
441 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
442
443 while ((skb = __skb_dequeue(&path->queue)))
444 __skb_queue_tail(&skqueue, skb);
445
446 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
447 if (neigh->ah) {
448 WARN_ON(neigh->ah != old_ah);
449 /*
450 * Dropping the ah reference inside
451 * priv->lock is safe here, because we
452 * will hold one more reference from
453 * the original value of path->ah (ie
454 * old_ah).
455 */
456 ipoib_put_ah(neigh->ah);
457 }
458 kref_get(&path->ah->ref);
459 neigh->ah = path->ah;
460 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
461 sizeof(union ib_gid));
462
463 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
464 if (!ipoib_cm_get(neigh))
465 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
466 path,
467 neigh));
468 if (!ipoib_cm_get(neigh)) {
469 list_del(&neigh->list);
470 if (neigh->ah)
471 ipoib_put_ah(neigh->ah);
472 ipoib_neigh_free(dev, neigh);
473 continue;
474 }
475 }
476
477 while ((skb = __skb_dequeue(&neigh->queue)))
478 __skb_queue_tail(&skqueue, skb);
479 }
480 path->valid = 1;
481 }
482
483 path->query = NULL;
484 complete(&path->done);
485
486 spin_unlock_irqrestore(&priv->lock, flags);
487
488 if (old_ah)
489 ipoib_put_ah(old_ah);
490
491 while ((skb = __skb_dequeue(&skqueue))) {
492 skb->dev = dev;
493 if (dev_queue_xmit(skb))
494 ipoib_warn(priv, "dev_queue_xmit failed "
495 "to requeue packet\n");
496 }
497 }
498
499 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
500 {
501 struct ipoib_dev_priv *priv = netdev_priv(dev);
502 struct ipoib_path *path;
503
504 if (!priv->broadcast)
505 return NULL;
506
507 path = kzalloc(sizeof *path, GFP_ATOMIC);
508 if (!path)
509 return NULL;
510
511 path->dev = dev;
512
513 skb_queue_head_init(&path->queue);
514
515 INIT_LIST_HEAD(&path->neigh_list);
516
517 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
518 path->pathrec.sgid = priv->local_gid;
519 path->pathrec.pkey = cpu_to_be16(priv->pkey);
520 path->pathrec.numb_path = 1;
521 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
522
523 return path;
524 }
525
526 static int path_rec_start(struct net_device *dev,
527 struct ipoib_path *path)
528 {
529 struct ipoib_dev_priv *priv = netdev_priv(dev);
530
531 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
532 path->pathrec.dgid.raw);
533
534 init_completion(&path->done);
535
536 path->query_id =
537 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
538 &path->pathrec,
539 IB_SA_PATH_REC_DGID |
540 IB_SA_PATH_REC_SGID |
541 IB_SA_PATH_REC_NUMB_PATH |
542 IB_SA_PATH_REC_TRAFFIC_CLASS |
543 IB_SA_PATH_REC_PKEY,
544 1000, GFP_ATOMIC,
545 path_rec_completion,
546 path, &path->query);
547 if (path->query_id < 0) {
548 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
549 path->query = NULL;
550 complete(&path->done);
551 return path->query_id;
552 }
553
554 return 0;
555 }
556
557 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
558 {
559 struct ipoib_dev_priv *priv = netdev_priv(dev);
560 struct ipoib_path *path;
561 struct ipoib_neigh *neigh;
562 unsigned long flags;
563
564 neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
565 if (!neigh) {
566 ++dev->stats.tx_dropped;
567 dev_kfree_skb_any(skb);
568 return;
569 }
570
571 spin_lock_irqsave(&priv->lock, flags);
572
573 path = __path_find(dev, skb->dst->neighbour->ha + 4);
574 if (!path) {
575 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
576 if (!path)
577 goto err_path;
578
579 __path_add(dev, path);
580 }
581
582 list_add_tail(&neigh->list, &path->neigh_list);
583
584 if (path->ah) {
585 kref_get(&path->ah->ref);
586 neigh->ah = path->ah;
587 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
588 sizeof(union ib_gid));
589
590 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
591 if (!ipoib_cm_get(neigh))
592 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
593 if (!ipoib_cm_get(neigh)) {
594 list_del(&neigh->list);
595 if (neigh->ah)
596 ipoib_put_ah(neigh->ah);
597 ipoib_neigh_free(dev, neigh);
598 goto err_drop;
599 }
600 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
601 __skb_queue_tail(&neigh->queue, skb);
602 else {
603 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
604 skb_queue_len(&neigh->queue));
605 goto err_drop;
606 }
607 } else
608 ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
609 } else {
610 neigh->ah = NULL;
611
612 if (!path->query && path_rec_start(dev, path))
613 goto err_list;
614
615 __skb_queue_tail(&neigh->queue, skb);
616 }
617
618 spin_unlock_irqrestore(&priv->lock, flags);
619 return;
620
621 err_list:
622 list_del(&neigh->list);
623
624 err_path:
625 ipoib_neigh_free(dev, neigh);
626 err_drop:
627 ++dev->stats.tx_dropped;
628 dev_kfree_skb_any(skb);
629
630 spin_unlock_irqrestore(&priv->lock, flags);
631 }
632
633 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
634 {
635 struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
636
637 /* Look up path record for unicasts */
638 if (skb->dst->neighbour->ha[4] != 0xff) {
639 neigh_add_path(skb, dev);
640 return;
641 }
642
643 /* Add in the P_Key for multicasts */
644 skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
645 skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
646 ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
647 }
648
649 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
650 struct ipoib_pseudoheader *phdr)
651 {
652 struct ipoib_dev_priv *priv = netdev_priv(dev);
653 struct ipoib_path *path;
654 unsigned long flags;
655
656 spin_lock_irqsave(&priv->lock, flags);
657
658 path = __path_find(dev, phdr->hwaddr + 4);
659 if (!path || !path->valid) {
660 if (!path)
661 path = path_rec_create(dev, phdr->hwaddr + 4);
662 if (path) {
663 /* put pseudoheader back on for next time */
664 skb_push(skb, sizeof *phdr);
665 __skb_queue_tail(&path->queue, skb);
666
667 if (!path->query && path_rec_start(dev, path)) {
668 spin_unlock_irqrestore(&priv->lock, flags);
669 path_free(dev, path);
670 return;
671 } else
672 __path_add(dev, path);
673 } else {
674 ++dev->stats.tx_dropped;
675 dev_kfree_skb_any(skb);
676 }
677
678 spin_unlock_irqrestore(&priv->lock, flags);
679 return;
680 }
681
682 if (path->ah) {
683 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
684 be16_to_cpu(path->pathrec.dlid));
685
686 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
687 } else if ((path->query || !path_rec_start(dev, path)) &&
688 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
689 /* put pseudoheader back on for next time */
690 skb_push(skb, sizeof *phdr);
691 __skb_queue_tail(&path->queue, skb);
692 } else {
693 ++dev->stats.tx_dropped;
694 dev_kfree_skb_any(skb);
695 }
696
697 spin_unlock_irqrestore(&priv->lock, flags);
698 }
699
700 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
701 {
702 struct ipoib_dev_priv *priv = netdev_priv(dev);
703 struct ipoib_neigh *neigh;
704 unsigned long flags;
705
706 if (likely(skb->dst && skb->dst->neighbour)) {
707 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
708 ipoib_path_lookup(skb, dev);
709 return NETDEV_TX_OK;
710 }
711
712 neigh = *to_ipoib_neigh(skb->dst->neighbour);
713
714 if (unlikely((memcmp(&neigh->dgid.raw,
715 skb->dst->neighbour->ha + 4,
716 sizeof(union ib_gid))) ||
717 (neigh->dev != dev))) {
718 spin_lock_irqsave(&priv->lock, flags);
719 /*
720 * It's safe to call ipoib_put_ah() inside
721 * priv->lock here, because we know that
722 * path->ah will always hold one more reference,
723 * so ipoib_put_ah() will never do more than
724 * decrement the ref count.
725 */
726 if (neigh->ah)
727 ipoib_put_ah(neigh->ah);
728 list_del(&neigh->list);
729 ipoib_neigh_free(dev, neigh);
730 spin_unlock_irqrestore(&priv->lock, flags);
731 ipoib_path_lookup(skb, dev);
732 return NETDEV_TX_OK;
733 }
734
735 if (ipoib_cm_get(neigh)) {
736 if (ipoib_cm_up(neigh)) {
737 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
738 return NETDEV_TX_OK;
739 }
740 } else if (neigh->ah) {
741 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
742 return NETDEV_TX_OK;
743 }
744
745 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
746 spin_lock_irqsave(&priv->lock, flags);
747 __skb_queue_tail(&neigh->queue, skb);
748 spin_unlock_irqrestore(&priv->lock, flags);
749 } else {
750 ++dev->stats.tx_dropped;
751 dev_kfree_skb_any(skb);
752 }
753 } else {
754 struct ipoib_pseudoheader *phdr =
755 (struct ipoib_pseudoheader *) skb->data;
756 skb_pull(skb, sizeof *phdr);
757
758 if (phdr->hwaddr[4] == 0xff) {
759 /* Add in the P_Key for multicast*/
760 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
761 phdr->hwaddr[9] = priv->pkey & 0xff;
762
763 ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
764 } else {
765 /* unicast GID -- should be ARP or RARP reply */
766
767 if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
768 (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
769 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x %pI6\n",
770 skb->dst ? "neigh" : "dst",
771 be16_to_cpup((__be16 *) skb->data),
772 IPOIB_QPN(phdr->hwaddr),
773 phdr->hwaddr + 4);
774 dev_kfree_skb_any(skb);
775 ++dev->stats.tx_dropped;
776 return NETDEV_TX_OK;
777 }
778
779 unicast_arp_send(skb, dev, phdr);
780 }
781 }
782
783 return NETDEV_TX_OK;
784 }
785
786 static void ipoib_timeout(struct net_device *dev)
787 {
788 struct ipoib_dev_priv *priv = netdev_priv(dev);
789
790 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
791 jiffies_to_msecs(jiffies - dev->trans_start));
792 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
793 netif_queue_stopped(dev),
794 priv->tx_head, priv->tx_tail);
795 /* XXX reset QP, etc. */
796 }
797
798 static int ipoib_hard_header(struct sk_buff *skb,
799 struct net_device *dev,
800 unsigned short type,
801 const void *daddr, const void *saddr, unsigned len)
802 {
803 struct ipoib_header *header;
804
805 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
806
807 header->proto = htons(type);
808 header->reserved = 0;
809
810 /*
811 * If we don't have a neighbour structure, stuff the
812 * destination address onto the front of the skb so we can
813 * figure out where to send the packet later.
814 */
815 if ((!skb->dst || !skb->dst->neighbour) && daddr) {
816 struct ipoib_pseudoheader *phdr =
817 (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
818 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
819 }
820
821 return 0;
822 }
823
824 static void ipoib_set_mcast_list(struct net_device *dev)
825 {
826 struct ipoib_dev_priv *priv = netdev_priv(dev);
827
828 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
829 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
830 return;
831 }
832
833 queue_work(ipoib_workqueue, &priv->restart_task);
834 }
835
836 static void ipoib_neigh_cleanup(struct neighbour *n)
837 {
838 struct ipoib_neigh *neigh;
839 struct ipoib_dev_priv *priv = netdev_priv(n->dev);
840 unsigned long flags;
841 struct ipoib_ah *ah = NULL;
842
843 neigh = *to_ipoib_neigh(n);
844 if (neigh)
845 priv = netdev_priv(neigh->dev);
846 else
847 return;
848 ipoib_dbg(priv,
849 "neigh_cleanup for %06x %pI6\n",
850 IPOIB_QPN(n->ha),
851 n->ha + 4);
852
853 spin_lock_irqsave(&priv->lock, flags);
854
855 if (neigh->ah)
856 ah = neigh->ah;
857 list_del(&neigh->list);
858 ipoib_neigh_free(n->dev, neigh);
859
860 spin_unlock_irqrestore(&priv->lock, flags);
861
862 if (ah)
863 ipoib_put_ah(ah);
864 }
865
866 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
867 struct net_device *dev)
868 {
869 struct ipoib_neigh *neigh;
870
871 neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
872 if (!neigh)
873 return NULL;
874
875 neigh->neighbour = neighbour;
876 neigh->dev = dev;
877 *to_ipoib_neigh(neighbour) = neigh;
878 skb_queue_head_init(&neigh->queue);
879 ipoib_cm_set(neigh, NULL);
880
881 return neigh;
882 }
883
884 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
885 {
886 struct sk_buff *skb;
887 *to_ipoib_neigh(neigh->neighbour) = NULL;
888 while ((skb = __skb_dequeue(&neigh->queue))) {
889 ++dev->stats.tx_dropped;
890 dev_kfree_skb_any(skb);
891 }
892 if (ipoib_cm_get(neigh))
893 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
894 kfree(neigh);
895 }
896
897 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
898 {
899 parms->neigh_cleanup = ipoib_neigh_cleanup;
900
901 return 0;
902 }
903
904 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
905 {
906 struct ipoib_dev_priv *priv = netdev_priv(dev);
907
908 /* Allocate RX/TX "rings" to hold queued skbs */
909 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
910 GFP_KERNEL);
911 if (!priv->rx_ring) {
912 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
913 ca->name, ipoib_recvq_size);
914 goto out;
915 }
916
917 priv->tx_ring = vmalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
918 if (!priv->tx_ring) {
919 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
920 ca->name, ipoib_sendq_size);
921 goto out_rx_ring_cleanup;
922 }
923 memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring);
924
925 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
926
927 if (ipoib_ib_dev_init(dev, ca, port))
928 goto out_tx_ring_cleanup;
929
930 return 0;
931
932 out_tx_ring_cleanup:
933 vfree(priv->tx_ring);
934
935 out_rx_ring_cleanup:
936 kfree(priv->rx_ring);
937
938 out:
939 return -ENOMEM;
940 }
941
942 void ipoib_dev_cleanup(struct net_device *dev)
943 {
944 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
945
946 ipoib_delete_debug_files(dev);
947
948 /* Delete any child interfaces first */
949 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
950 unregister_netdev(cpriv->dev);
951 ipoib_dev_cleanup(cpriv->dev);
952 free_netdev(cpriv->dev);
953 }
954
955 ipoib_ib_dev_cleanup(dev);
956
957 kfree(priv->rx_ring);
958 vfree(priv->tx_ring);
959
960 priv->rx_ring = NULL;
961 priv->tx_ring = NULL;
962 }
963
964 static const struct header_ops ipoib_header_ops = {
965 .create = ipoib_hard_header,
966 };
967
968 static int get_skb_hdr(struct sk_buff *skb, void **iphdr,
969 void **tcph, u64 *hdr_flags, void *priv)
970 {
971 unsigned int ip_len;
972 struct iphdr *iph;
973
974 if (unlikely(skb->protocol != htons(ETH_P_IP)))
975 return -1;
976
977 /*
978 * In the future we may add an else clause that verifies the
979 * checksum and allows devices which do not calculate checksum
980 * to use LRO.
981 */
982 if (unlikely(skb->ip_summed != CHECKSUM_UNNECESSARY))
983 return -1;
984
985 /* Check for non-TCP packet */
986 skb_reset_network_header(skb);
987 iph = ip_hdr(skb);
988 if (iph->protocol != IPPROTO_TCP)
989 return -1;
990
991 ip_len = ip_hdrlen(skb);
992 skb_set_transport_header(skb, ip_len);
993 *tcph = tcp_hdr(skb);
994
995 /* check if IP header and TCP header are complete */
996 if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
997 return -1;
998
999 *hdr_flags = LRO_IPV4 | LRO_TCP;
1000 *iphdr = iph;
1001
1002 return 0;
1003 }
1004
1005 static void ipoib_lro_setup(struct ipoib_dev_priv *priv)
1006 {
1007 priv->lro.lro_mgr.max_aggr = lro_max_aggr;
1008 priv->lro.lro_mgr.max_desc = IPOIB_MAX_LRO_DESCRIPTORS;
1009 priv->lro.lro_mgr.lro_arr = priv->lro.lro_desc;
1010 priv->lro.lro_mgr.get_skb_header = get_skb_hdr;
1011 priv->lro.lro_mgr.features = LRO_F_NAPI;
1012 priv->lro.lro_mgr.dev = priv->dev;
1013 priv->lro.lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
1014 }
1015
1016 static void ipoib_setup(struct net_device *dev)
1017 {
1018 struct ipoib_dev_priv *priv = netdev_priv(dev);
1019
1020 dev->open = ipoib_open;
1021 dev->stop = ipoib_stop;
1022 dev->change_mtu = ipoib_change_mtu;
1023 dev->hard_start_xmit = ipoib_start_xmit;
1024 dev->tx_timeout = ipoib_timeout;
1025 dev->header_ops = &ipoib_header_ops;
1026 dev->set_multicast_list = ipoib_set_mcast_list;
1027 dev->neigh_setup = ipoib_neigh_setup_dev;
1028
1029 ipoib_set_ethtool_ops(dev);
1030
1031 netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1032
1033 dev->watchdog_timeo = HZ;
1034
1035 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
1036
1037 /*
1038 * We add in INFINIBAND_ALEN to allow for the destination
1039 * address "pseudoheader" for skbs without neighbour struct.
1040 */
1041 dev->hard_header_len = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
1042 dev->addr_len = INFINIBAND_ALEN;
1043 dev->type = ARPHRD_INFINIBAND;
1044 dev->tx_queue_len = ipoib_sendq_size * 2;
1045 dev->features = (NETIF_F_VLAN_CHALLENGED |
1046 NETIF_F_HIGHDMA);
1047
1048 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1049
1050 netif_carrier_off(dev);
1051
1052 priv->dev = dev;
1053
1054 ipoib_lro_setup(priv);
1055
1056 spin_lock_init(&priv->lock);
1057
1058 mutex_init(&priv->vlan_mutex);
1059
1060 INIT_LIST_HEAD(&priv->path_list);
1061 INIT_LIST_HEAD(&priv->child_intfs);
1062 INIT_LIST_HEAD(&priv->dead_ahs);
1063 INIT_LIST_HEAD(&priv->multicast_list);
1064
1065 INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1066 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1067 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1068 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
1069 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
1070 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
1071 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1072 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1073 }
1074
1075 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1076 {
1077 struct net_device *dev;
1078
1079 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1080 ipoib_setup);
1081 if (!dev)
1082 return NULL;
1083
1084 return netdev_priv(dev);
1085 }
1086
1087 static ssize_t show_pkey(struct device *dev,
1088 struct device_attribute *attr, char *buf)
1089 {
1090 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1091
1092 return sprintf(buf, "0x%04x\n", priv->pkey);
1093 }
1094 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1095
1096 static ssize_t show_umcast(struct device *dev,
1097 struct device_attribute *attr, char *buf)
1098 {
1099 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1100
1101 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1102 }
1103
1104 static ssize_t set_umcast(struct device *dev,
1105 struct device_attribute *attr,
1106 const char *buf, size_t count)
1107 {
1108 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1109 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1110
1111 if (umcast_val > 0) {
1112 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1113 ipoib_warn(priv, "ignoring multicast groups joined directly "
1114 "by userspace\n");
1115 } else
1116 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1117
1118 return count;
1119 }
1120 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1121
1122 int ipoib_add_umcast_attr(struct net_device *dev)
1123 {
1124 return device_create_file(&dev->dev, &dev_attr_umcast);
1125 }
1126
1127 static ssize_t create_child(struct device *dev,
1128 struct device_attribute *attr,
1129 const char *buf, size_t count)
1130 {
1131 int pkey;
1132 int ret;
1133
1134 if (sscanf(buf, "%i", &pkey) != 1)
1135 return -EINVAL;
1136
1137 if (pkey < 0 || pkey > 0xffff)
1138 return -EINVAL;
1139
1140 /*
1141 * Set the full membership bit, so that we join the right
1142 * broadcast group, etc.
1143 */
1144 pkey |= 0x8000;
1145
1146 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1147
1148 return ret ? ret : count;
1149 }
1150 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1151
1152 static ssize_t delete_child(struct device *dev,
1153 struct device_attribute *attr,
1154 const char *buf, size_t count)
1155 {
1156 int pkey;
1157 int ret;
1158
1159 if (sscanf(buf, "%i", &pkey) != 1)
1160 return -EINVAL;
1161
1162 if (pkey < 0 || pkey > 0xffff)
1163 return -EINVAL;
1164
1165 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1166
1167 return ret ? ret : count;
1168
1169 }
1170 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1171
1172 int ipoib_add_pkey_attr(struct net_device *dev)
1173 {
1174 return device_create_file(&dev->dev, &dev_attr_pkey);
1175 }
1176
1177 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1178 {
1179 struct ib_device_attr *device_attr;
1180 int result = -ENOMEM;
1181
1182 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1183 if (!device_attr) {
1184 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1185 hca->name, sizeof *device_attr);
1186 return result;
1187 }
1188
1189 result = ib_query_device(hca, device_attr);
1190 if (result) {
1191 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1192 hca->name, result);
1193 kfree(device_attr);
1194 return result;
1195 }
1196 priv->hca_caps = device_attr->device_cap_flags;
1197
1198 kfree(device_attr);
1199
1200 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1201 set_bit(IPOIB_FLAG_CSUM, &priv->flags);
1202 priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
1203 }
1204
1205 if (lro)
1206 priv->dev->features |= NETIF_F_LRO;
1207
1208 if (priv->dev->features & NETIF_F_SG && priv->hca_caps & IB_DEVICE_UD_TSO)
1209 priv->dev->features |= NETIF_F_TSO;
1210
1211 return 0;
1212 }
1213
1214
1215 static struct net_device *ipoib_add_port(const char *format,
1216 struct ib_device *hca, u8 port)
1217 {
1218 struct ipoib_dev_priv *priv;
1219 struct ib_port_attr attr;
1220 int result = -ENOMEM;
1221
1222 priv = ipoib_intf_alloc(format);
1223 if (!priv)
1224 goto alloc_mem_failed;
1225
1226 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1227
1228 if (!ib_query_port(hca, port, &attr))
1229 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1230 else {
1231 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1232 hca->name, port);
1233 goto device_init_failed;
1234 }
1235
1236 /* MTU will be reset when mcast join happens */
1237 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1238 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
1239
1240 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1241 if (result) {
1242 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1243 hca->name, port, result);
1244 goto device_init_failed;
1245 }
1246
1247 if (ipoib_set_dev_features(priv, hca))
1248 goto device_init_failed;
1249
1250 /*
1251 * Set the full membership bit, so that we join the right
1252 * broadcast group, etc.
1253 */
1254 priv->pkey |= 0x8000;
1255
1256 priv->dev->broadcast[8] = priv->pkey >> 8;
1257 priv->dev->broadcast[9] = priv->pkey & 0xff;
1258
1259 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1260 if (result) {
1261 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1262 hca->name, port, result);
1263 goto device_init_failed;
1264 } else
1265 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1266
1267 result = ipoib_dev_init(priv->dev, hca, port);
1268 if (result < 0) {
1269 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1270 hca->name, port, result);
1271 goto device_init_failed;
1272 }
1273
1274 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1275 priv->ca, ipoib_event);
1276 result = ib_register_event_handler(&priv->event_handler);
1277 if (result < 0) {
1278 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1279 "port %d (ret = %d)\n",
1280 hca->name, port, result);
1281 goto event_failed;
1282 }
1283
1284 result = register_netdev(priv->dev);
1285 if (result) {
1286 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1287 hca->name, port, result);
1288 goto register_failed;
1289 }
1290
1291 ipoib_create_debug_files(priv->dev);
1292
1293 if (ipoib_cm_add_mode_attr(priv->dev))
1294 goto sysfs_failed;
1295 if (ipoib_add_pkey_attr(priv->dev))
1296 goto sysfs_failed;
1297 if (ipoib_add_umcast_attr(priv->dev))
1298 goto sysfs_failed;
1299 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1300 goto sysfs_failed;
1301 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1302 goto sysfs_failed;
1303
1304 return priv->dev;
1305
1306 sysfs_failed:
1307 ipoib_delete_debug_files(priv->dev);
1308 unregister_netdev(priv->dev);
1309
1310 register_failed:
1311 ib_unregister_event_handler(&priv->event_handler);
1312 flush_workqueue(ipoib_workqueue);
1313
1314 event_failed:
1315 ipoib_dev_cleanup(priv->dev);
1316
1317 device_init_failed:
1318 free_netdev(priv->dev);
1319
1320 alloc_mem_failed:
1321 return ERR_PTR(result);
1322 }
1323
1324 static void ipoib_add_one(struct ib_device *device)
1325 {
1326 struct list_head *dev_list;
1327 struct net_device *dev;
1328 struct ipoib_dev_priv *priv;
1329 int s, e, p;
1330
1331 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1332 return;
1333
1334 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1335 if (!dev_list)
1336 return;
1337
1338 INIT_LIST_HEAD(dev_list);
1339
1340 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1341 s = 0;
1342 e = 0;
1343 } else {
1344 s = 1;
1345 e = device->phys_port_cnt;
1346 }
1347
1348 for (p = s; p <= e; ++p) {
1349 dev = ipoib_add_port("ib%d", device, p);
1350 if (!IS_ERR(dev)) {
1351 priv = netdev_priv(dev);
1352 list_add_tail(&priv->list, dev_list);
1353 }
1354 }
1355
1356 ib_set_client_data(device, &ipoib_client, dev_list);
1357 }
1358
1359 static void ipoib_remove_one(struct ib_device *device)
1360 {
1361 struct ipoib_dev_priv *priv, *tmp;
1362 struct list_head *dev_list;
1363
1364 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1365 return;
1366
1367 dev_list = ib_get_client_data(device, &ipoib_client);
1368
1369 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1370 ib_unregister_event_handler(&priv->event_handler);
1371
1372 rtnl_lock();
1373 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1374 rtnl_unlock();
1375
1376 flush_workqueue(ipoib_workqueue);
1377
1378 unregister_netdev(priv->dev);
1379 ipoib_dev_cleanup(priv->dev);
1380 free_netdev(priv->dev);
1381 }
1382
1383 kfree(dev_list);
1384 }
1385
1386 static int __init ipoib_init_module(void)
1387 {
1388 int ret;
1389
1390 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1391 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1392 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1393
1394 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1395 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1396 ipoib_sendq_size = max(ipoib_sendq_size, max(2 * MAX_SEND_CQE,
1397 IPOIB_MIN_QUEUE_SIZE));
1398 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1399 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1400 #endif
1401
1402 /*
1403 * When copying small received packets, we only copy from the
1404 * linear data part of the SKB, so we rely on this condition.
1405 */
1406 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1407
1408 ret = ipoib_register_debugfs();
1409 if (ret)
1410 return ret;
1411
1412 /*
1413 * We create our own workqueue mainly because we want to be
1414 * able to flush it when devices are being removed. We can't
1415 * use schedule_work()/flush_scheduled_work() because both
1416 * unregister_netdev() and linkwatch_event take the rtnl lock,
1417 * so flush_scheduled_work() can deadlock during device
1418 * removal.
1419 */
1420 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1421 if (!ipoib_workqueue) {
1422 ret = -ENOMEM;
1423 goto err_fs;
1424 }
1425
1426 ib_sa_register_client(&ipoib_sa_client);
1427
1428 ret = ib_register_client(&ipoib_client);
1429 if (ret)
1430 goto err_sa;
1431
1432 return 0;
1433
1434 err_sa:
1435 ib_sa_unregister_client(&ipoib_sa_client);
1436 destroy_workqueue(ipoib_workqueue);
1437
1438 err_fs:
1439 ipoib_unregister_debugfs();
1440
1441 return ret;
1442 }
1443
1444 static void __exit ipoib_cleanup_module(void)
1445 {
1446 ib_unregister_client(&ipoib_client);
1447 ib_sa_unregister_client(&ipoib_sa_client);
1448 ipoib_unregister_debugfs();
1449 destroy_workqueue(ipoib_workqueue);
1450 }
1451
1452 module_init(ipoib_init_module);
1453 module_exit(ipoib_cleanup_module);
Linux 2.6 libata-dev (mirror)