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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[linux-2.6.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
blob9ff7bc73ed95e8689bede687e30086acc99fe4fe
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 if (ipoib_ib_dev_open(dev))
115 goto err_disable;
116
117 if (ipoib_ib_dev_up(dev))
118 goto err_stop;
119
120 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
121 struct ipoib_dev_priv *cpriv;
122
123 /* Bring up any child interfaces too */
124 mutex_lock(&priv->vlan_mutex);
125 list_for_each_entry(cpriv, &priv->child_intfs, list) {
126 int flags;
127
128 flags = cpriv->dev->flags;
129 if (flags & IFF_UP)
130 continue;
131
132 dev_change_flags(cpriv->dev, flags | IFF_UP);
133 }
134 mutex_unlock(&priv->vlan_mutex);
135 }
136
137 netif_start_queue(dev);
138
139 return 0;
140
141 err_stop:
142 ipoib_ib_dev_stop(dev, 1);
143
144 err_disable:
145 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
146
147 return -EINVAL;
148 }
149
150 static int ipoib_stop(struct net_device *dev)
151 {
152 struct ipoib_dev_priv *priv = netdev_priv(dev);
153
154 ipoib_dbg(priv, "stopping interface\n");
155
156 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
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(skb)->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(skb)->neighbour->ha + 4);
574 if (!path) {
575 path = path_rec_create(dev, skb_dst(skb)->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 spin_unlock_irqrestore(&priv->lock, flags);
609 ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb_dst(skb)->neighbour->ha));
610 return;
611 }
612 } else {
613 neigh->ah = NULL;
614
615 if (!path->query && path_rec_start(dev, path))
616 goto err_list;
617
618 __skb_queue_tail(&neigh->queue, skb);
619 }
620
621 spin_unlock_irqrestore(&priv->lock, flags);
622 return;
623
624 err_list:
625 list_del(&neigh->list);
626
627 err_path:
628 ipoib_neigh_free(dev, neigh);
629 err_drop:
630 ++dev->stats.tx_dropped;
631 dev_kfree_skb_any(skb);
632
633 spin_unlock_irqrestore(&priv->lock, flags);
634 }
635
636 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
637 {
638 struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
639
640 /* Look up path record for unicasts */
641 if (skb_dst(skb)->neighbour->ha[4] != 0xff) {
642 neigh_add_path(skb, dev);
643 return;
644 }
645
646 /* Add in the P_Key for multicasts */
647 skb_dst(skb)->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
648 skb_dst(skb)->neighbour->ha[9] = priv->pkey & 0xff;
649 ipoib_mcast_send(dev, skb_dst(skb)->neighbour->ha + 4, skb);
650 }
651
652 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
653 struct ipoib_pseudoheader *phdr)
654 {
655 struct ipoib_dev_priv *priv = netdev_priv(dev);
656 struct ipoib_path *path;
657 unsigned long flags;
658
659 spin_lock_irqsave(&priv->lock, flags);
660
661 path = __path_find(dev, phdr->hwaddr + 4);
662 if (!path || !path->valid) {
663 int new_path = 0;
664
665 if (!path) {
666 path = path_rec_create(dev, phdr->hwaddr + 4);
667 new_path = 1;
668 }
669 if (path) {
670 /* put pseudoheader back on for next time */
671 skb_push(skb, sizeof *phdr);
672 __skb_queue_tail(&path->queue, skb);
673
674 if (!path->query && path_rec_start(dev, path)) {
675 spin_unlock_irqrestore(&priv->lock, flags);
676 if (new_path)
677 path_free(dev, path);
678 return;
679 } else
680 __path_add(dev, path);
681 } else {
682 ++dev->stats.tx_dropped;
683 dev_kfree_skb_any(skb);
684 }
685
686 spin_unlock_irqrestore(&priv->lock, flags);
687 return;
688 }
689
690 if (path->ah) {
691 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
692 be16_to_cpu(path->pathrec.dlid));
693
694 spin_unlock_irqrestore(&priv->lock, flags);
695 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
696 return;
697 } else if ((path->query || !path_rec_start(dev, path)) &&
698 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
699 /* put pseudoheader back on for next time */
700 skb_push(skb, sizeof *phdr);
701 __skb_queue_tail(&path->queue, skb);
702 } else {
703 ++dev->stats.tx_dropped;
704 dev_kfree_skb_any(skb);
705 }
706
707 spin_unlock_irqrestore(&priv->lock, flags);
708 }
709
710 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
711 {
712 struct ipoib_dev_priv *priv = netdev_priv(dev);
713 struct ipoib_neigh *neigh;
714 unsigned long flags;
715
716 if (likely(skb_dst(skb) && skb_dst(skb)->neighbour)) {
717 if (unlikely(!*to_ipoib_neigh(skb_dst(skb)->neighbour))) {
718 ipoib_path_lookup(skb, dev);
719 return NETDEV_TX_OK;
720 }
721
722 neigh = *to_ipoib_neigh(skb_dst(skb)->neighbour);
723
724 if (unlikely((memcmp(&neigh->dgid.raw,
725 skb_dst(skb)->neighbour->ha + 4,
726 sizeof(union ib_gid))) ||
727 (neigh->dev != dev))) {
728 spin_lock_irqsave(&priv->lock, flags);
729 /*
730 * It's safe to call ipoib_put_ah() inside
731 * priv->lock here, because we know that
732 * path->ah will always hold one more reference,
733 * so ipoib_put_ah() will never do more than
734 * decrement the ref count.
735 */
736 if (neigh->ah)
737 ipoib_put_ah(neigh->ah);
738 list_del(&neigh->list);
739 ipoib_neigh_free(dev, neigh);
740 spin_unlock_irqrestore(&priv->lock, flags);
741 ipoib_path_lookup(skb, dev);
742 return NETDEV_TX_OK;
743 }
744
745 if (ipoib_cm_get(neigh)) {
746 if (ipoib_cm_up(neigh)) {
747 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
748 return NETDEV_TX_OK;
749 }
750 } else if (neigh->ah) {
751 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb_dst(skb)->neighbour->ha));
752 return NETDEV_TX_OK;
753 }
754
755 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
756 spin_lock_irqsave(&priv->lock, flags);
757 __skb_queue_tail(&neigh->queue, skb);
758 spin_unlock_irqrestore(&priv->lock, flags);
759 } else {
760 ++dev->stats.tx_dropped;
761 dev_kfree_skb_any(skb);
762 }
763 } else {
764 struct ipoib_pseudoheader *phdr =
765 (struct ipoib_pseudoheader *) skb->data;
766 skb_pull(skb, sizeof *phdr);
767
768 if (phdr->hwaddr[4] == 0xff) {
769 /* Add in the P_Key for multicast*/
770 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
771 phdr->hwaddr[9] = priv->pkey & 0xff;
772
773 ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
774 } else {
775 /* unicast GID -- should be ARP or RARP reply */
776
777 if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
778 (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
779 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x %pI6\n",
780 skb_dst(skb) ? "neigh" : "dst",
781 be16_to_cpup((__be16 *) skb->data),
782 IPOIB_QPN(phdr->hwaddr),
783 phdr->hwaddr + 4);
784 dev_kfree_skb_any(skb);
785 ++dev->stats.tx_dropped;
786 return NETDEV_TX_OK;
787 }
788
789 unicast_arp_send(skb, dev, phdr);
790 }
791 }
792
793 return NETDEV_TX_OK;
794 }
795
796 static void ipoib_timeout(struct net_device *dev)
797 {
798 struct ipoib_dev_priv *priv = netdev_priv(dev);
799
800 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
801 jiffies_to_msecs(jiffies - dev->trans_start));
802 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
803 netif_queue_stopped(dev),
804 priv->tx_head, priv->tx_tail);
805 /* XXX reset QP, etc. */
806 }
807
808 static int ipoib_hard_header(struct sk_buff *skb,
809 struct net_device *dev,
810 unsigned short type,
811 const void *daddr, const void *saddr, unsigned len)
812 {
813 struct ipoib_header *header;
814
815 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
816
817 header->proto = htons(type);
818 header->reserved = 0;
819
820 /*
821 * If we don't have a neighbour structure, stuff the
822 * destination address onto the front of the skb so we can
823 * figure out where to send the packet later.
824 */
825 if ((!skb_dst(skb) || !skb_dst(skb)->neighbour) && daddr) {
826 struct ipoib_pseudoheader *phdr =
827 (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
828 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
829 }
830
831 return 0;
832 }
833
834 static void ipoib_set_mcast_list(struct net_device *dev)
835 {
836 struct ipoib_dev_priv *priv = netdev_priv(dev);
837
838 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
839 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
840 return;
841 }
842
843 queue_work(ipoib_workqueue, &priv->restart_task);
844 }
845
846 static void ipoib_neigh_cleanup(struct neighbour *n)
847 {
848 struct ipoib_neigh *neigh;
849 struct ipoib_dev_priv *priv = netdev_priv(n->dev);
850 unsigned long flags;
851 struct ipoib_ah *ah = NULL;
852
853 neigh = *to_ipoib_neigh(n);
854 if (neigh)
855 priv = netdev_priv(neigh->dev);
856 else
857 return;
858 ipoib_dbg(priv,
859 "neigh_cleanup for %06x %pI6\n",
860 IPOIB_QPN(n->ha),
861 n->ha + 4);
862
863 spin_lock_irqsave(&priv->lock, flags);
864
865 if (neigh->ah)
866 ah = neigh->ah;
867 list_del(&neigh->list);
868 ipoib_neigh_free(n->dev, neigh);
869
870 spin_unlock_irqrestore(&priv->lock, flags);
871
872 if (ah)
873 ipoib_put_ah(ah);
874 }
875
876 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
877 struct net_device *dev)
878 {
879 struct ipoib_neigh *neigh;
880
881 neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
882 if (!neigh)
883 return NULL;
884
885 neigh->neighbour = neighbour;
886 neigh->dev = dev;
887 memset(&neigh->dgid.raw, 0, sizeof (union ib_gid));
888 *to_ipoib_neigh(neighbour) = neigh;
889 skb_queue_head_init(&neigh->queue);
890 ipoib_cm_set(neigh, NULL);
891
892 return neigh;
893 }
894
895 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
896 {
897 struct sk_buff *skb;
898 *to_ipoib_neigh(neigh->neighbour) = NULL;
899 while ((skb = __skb_dequeue(&neigh->queue))) {
900 ++dev->stats.tx_dropped;
901 dev_kfree_skb_any(skb);
902 }
903 if (ipoib_cm_get(neigh))
904 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
905 kfree(neigh);
906 }
907
908 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
909 {
910 parms->neigh_cleanup = ipoib_neigh_cleanup;
911
912 return 0;
913 }
914
915 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
916 {
917 struct ipoib_dev_priv *priv = netdev_priv(dev);
918
919 /* Allocate RX/TX "rings" to hold queued skbs */
920 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
921 GFP_KERNEL);
922 if (!priv->rx_ring) {
923 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
924 ca->name, ipoib_recvq_size);
925 goto out;
926 }
927
928 priv->tx_ring = vmalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
929 if (!priv->tx_ring) {
930 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
931 ca->name, ipoib_sendq_size);
932 goto out_rx_ring_cleanup;
933 }
934 memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring);
935
936 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
937
938 if (ipoib_ib_dev_init(dev, ca, port))
939 goto out_tx_ring_cleanup;
940
941 return 0;
942
943 out_tx_ring_cleanup:
944 vfree(priv->tx_ring);
945
946 out_rx_ring_cleanup:
947 kfree(priv->rx_ring);
948
949 out:
950 return -ENOMEM;
951 }
952
953 void ipoib_dev_cleanup(struct net_device *dev)
954 {
955 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
956
957 ipoib_delete_debug_files(dev);
958
959 /* Delete any child interfaces first */
960 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
961 unregister_netdev(cpriv->dev);
962 ipoib_dev_cleanup(cpriv->dev);
963 free_netdev(cpriv->dev);
964 }
965
966 ipoib_ib_dev_cleanup(dev);
967
968 kfree(priv->rx_ring);
969 vfree(priv->tx_ring);
970
971 priv->rx_ring = NULL;
972 priv->tx_ring = NULL;
973 }
974
975 static const struct header_ops ipoib_header_ops = {
976 .create = ipoib_hard_header,
977 };
978
979 static int get_skb_hdr(struct sk_buff *skb, void **iphdr,
980 void **tcph, u64 *hdr_flags, void *priv)
981 {
982 unsigned int ip_len;
983 struct iphdr *iph;
984
985 if (unlikely(skb->protocol != htons(ETH_P_IP)))
986 return -1;
987
988 /*
989 * In the future we may add an else clause that verifies the
990 * checksum and allows devices which do not calculate checksum
991 * to use LRO.
992 */
993 if (unlikely(skb->ip_summed != CHECKSUM_UNNECESSARY))
994 return -1;
995
996 /* Check for non-TCP packet */
997 skb_reset_network_header(skb);
998 iph = ip_hdr(skb);
999 if (iph->protocol != IPPROTO_TCP)
1000 return -1;
1001
1002 ip_len = ip_hdrlen(skb);
1003 skb_set_transport_header(skb, ip_len);
1004 *tcph = tcp_hdr(skb);
1005
1006 /* check if IP header and TCP header are complete */
1007 if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
1008 return -1;
1009
1010 *hdr_flags = LRO_IPV4 | LRO_TCP;
1011 *iphdr = iph;
1012
1013 return 0;
1014 }
1015
1016 static void ipoib_lro_setup(struct ipoib_dev_priv *priv)
1017 {
1018 priv->lro.lro_mgr.max_aggr = lro_max_aggr;
1019 priv->lro.lro_mgr.max_desc = IPOIB_MAX_LRO_DESCRIPTORS;
1020 priv->lro.lro_mgr.lro_arr = priv->lro.lro_desc;
1021 priv->lro.lro_mgr.get_skb_header = get_skb_hdr;
1022 priv->lro.lro_mgr.features = LRO_F_NAPI;
1023 priv->lro.lro_mgr.dev = priv->dev;
1024 priv->lro.lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
1025 }
1026
1027 static const struct net_device_ops ipoib_netdev_ops = {
1028 .ndo_open = ipoib_open,
1029 .ndo_stop = ipoib_stop,
1030 .ndo_change_mtu = ipoib_change_mtu,
1031 .ndo_start_xmit = ipoib_start_xmit,
1032 .ndo_tx_timeout = ipoib_timeout,
1033 .ndo_set_multicast_list = ipoib_set_mcast_list,
1034 .ndo_neigh_setup = ipoib_neigh_setup_dev,
1035 };
1036
1037 static void ipoib_setup(struct net_device *dev)
1038 {
1039 struct ipoib_dev_priv *priv = netdev_priv(dev);
1040
1041 dev->netdev_ops = &ipoib_netdev_ops;
1042 dev->header_ops = &ipoib_header_ops;
1043
1044 ipoib_set_ethtool_ops(dev);
1045
1046 netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1047
1048 dev->watchdog_timeo = HZ;
1049
1050 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
1051
1052 /*
1053 * We add in INFINIBAND_ALEN to allow for the destination
1054 * address "pseudoheader" for skbs without neighbour struct.
1055 */
1056 dev->hard_header_len = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
1057 dev->addr_len = INFINIBAND_ALEN;
1058 dev->type = ARPHRD_INFINIBAND;
1059 dev->tx_queue_len = ipoib_sendq_size * 2;
1060 dev->features = (NETIF_F_VLAN_CHALLENGED |
1061 NETIF_F_HIGHDMA);
1062 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1063
1064 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1065
1066 netif_carrier_off(dev);
1067
1068 priv->dev = dev;
1069
1070 ipoib_lro_setup(priv);
1071
1072 spin_lock_init(&priv->lock);
1073
1074 mutex_init(&priv->vlan_mutex);
1075
1076 INIT_LIST_HEAD(&priv->path_list);
1077 INIT_LIST_HEAD(&priv->child_intfs);
1078 INIT_LIST_HEAD(&priv->dead_ahs);
1079 INIT_LIST_HEAD(&priv->multicast_list);
1080
1081 INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1082 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1083 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1084 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
1085 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
1086 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
1087 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1088 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1089 }
1090
1091 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1092 {
1093 struct net_device *dev;
1094
1095 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1096 ipoib_setup);
1097 if (!dev)
1098 return NULL;
1099
1100 return netdev_priv(dev);
1101 }
1102
1103 static ssize_t show_pkey(struct device *dev,
1104 struct device_attribute *attr, char *buf)
1105 {
1106 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1107
1108 return sprintf(buf, "0x%04x\n", priv->pkey);
1109 }
1110 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1111
1112 static ssize_t show_umcast(struct device *dev,
1113 struct device_attribute *attr, char *buf)
1114 {
1115 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1116
1117 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1118 }
1119
1120 static ssize_t set_umcast(struct device *dev,
1121 struct device_attribute *attr,
1122 const char *buf, size_t count)
1123 {
1124 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1125 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1126
1127 if (umcast_val > 0) {
1128 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1129 ipoib_warn(priv, "ignoring multicast groups joined directly "
1130 "by userspace\n");
1131 } else
1132 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1133
1134 return count;
1135 }
1136 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1137
1138 int ipoib_add_umcast_attr(struct net_device *dev)
1139 {
1140 return device_create_file(&dev->dev, &dev_attr_umcast);
1141 }
1142
1143 static ssize_t create_child(struct device *dev,
1144 struct device_attribute *attr,
1145 const char *buf, size_t count)
1146 {
1147 int pkey;
1148 int ret;
1149
1150 if (sscanf(buf, "%i", &pkey) != 1)
1151 return -EINVAL;
1152
1153 if (pkey < 0 || pkey > 0xffff)
1154 return -EINVAL;
1155
1156 /*
1157 * Set the full membership bit, so that we join the right
1158 * broadcast group, etc.
1159 */
1160 pkey |= 0x8000;
1161
1162 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1163
1164 return ret ? ret : count;
1165 }
1166 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1167
1168 static ssize_t delete_child(struct device *dev,
1169 struct device_attribute *attr,
1170 const char *buf, size_t count)
1171 {
1172 int pkey;
1173 int ret;
1174
1175 if (sscanf(buf, "%i", &pkey) != 1)
1176 return -EINVAL;
1177
1178 if (pkey < 0 || pkey > 0xffff)
1179 return -EINVAL;
1180
1181 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1182
1183 return ret ? ret : count;
1184
1185 }
1186 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1187
1188 int ipoib_add_pkey_attr(struct net_device *dev)
1189 {
1190 return device_create_file(&dev->dev, &dev_attr_pkey);
1191 }
1192
1193 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1194 {
1195 struct ib_device_attr *device_attr;
1196 int result = -ENOMEM;
1197
1198 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1199 if (!device_attr) {
1200 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1201 hca->name, sizeof *device_attr);
1202 return result;
1203 }
1204
1205 result = ib_query_device(hca, device_attr);
1206 if (result) {
1207 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1208 hca->name, result);
1209 kfree(device_attr);
1210 return result;
1211 }
1212 priv->hca_caps = device_attr->device_cap_flags;
1213
1214 kfree(device_attr);
1215
1216 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1217 set_bit(IPOIB_FLAG_CSUM, &priv->flags);
1218 priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
1219 }
1220
1221 if (lro)
1222 priv->dev->features |= NETIF_F_LRO;
1223
1224 if (priv->dev->features & NETIF_F_SG && priv->hca_caps & IB_DEVICE_UD_TSO)
1225 priv->dev->features |= NETIF_F_TSO;
1226
1227 return 0;
1228 }
1229
1230
1231 static struct net_device *ipoib_add_port(const char *format,
1232 struct ib_device *hca, u8 port)
1233 {
1234 struct ipoib_dev_priv *priv;
1235 struct ib_port_attr attr;
1236 int result = -ENOMEM;
1237
1238 priv = ipoib_intf_alloc(format);
1239 if (!priv)
1240 goto alloc_mem_failed;
1241
1242 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1243 priv->dev->dev_id = port - 1;
1244
1245 if (!ib_query_port(hca, port, &attr))
1246 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1247 else {
1248 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1249 hca->name, port);
1250 goto device_init_failed;
1251 }
1252
1253 /* MTU will be reset when mcast join happens */
1254 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1255 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
1256
1257 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1258 if (result) {
1259 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1260 hca->name, port, result);
1261 goto device_init_failed;
1262 }
1263
1264 if (ipoib_set_dev_features(priv, hca))
1265 goto device_init_failed;
1266
1267 /*
1268 * Set the full membership bit, so that we join the right
1269 * broadcast group, etc.
1270 */
1271 priv->pkey |= 0x8000;
1272
1273 priv->dev->broadcast[8] = priv->pkey >> 8;
1274 priv->dev->broadcast[9] = priv->pkey & 0xff;
1275
1276 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1277 if (result) {
1278 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1279 hca->name, port, result);
1280 goto device_init_failed;
1281 } else
1282 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1283
1284 result = ipoib_dev_init(priv->dev, hca, port);
1285 if (result < 0) {
1286 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1287 hca->name, port, result);
1288 goto device_init_failed;
1289 }
1290
1291 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1292 priv->ca, ipoib_event);
1293 result = ib_register_event_handler(&priv->event_handler);
1294 if (result < 0) {
1295 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1296 "port %d (ret = %d)\n",
1297 hca->name, port, result);
1298 goto event_failed;
1299 }
1300
1301 result = register_netdev(priv->dev);
1302 if (result) {
1303 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1304 hca->name, port, result);
1305 goto register_failed;
1306 }
1307
1308 ipoib_create_debug_files(priv->dev);
1309
1310 if (ipoib_cm_add_mode_attr(priv->dev))
1311 goto sysfs_failed;
1312 if (ipoib_add_pkey_attr(priv->dev))
1313 goto sysfs_failed;
1314 if (ipoib_add_umcast_attr(priv->dev))
1315 goto sysfs_failed;
1316 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1317 goto sysfs_failed;
1318 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1319 goto sysfs_failed;
1320
1321 return priv->dev;
1322
1323 sysfs_failed:
1324 ipoib_delete_debug_files(priv->dev);
1325 unregister_netdev(priv->dev);
1326
1327 register_failed:
1328 ib_unregister_event_handler(&priv->event_handler);
1329 flush_workqueue(ipoib_workqueue);
1330
1331 event_failed:
1332 ipoib_dev_cleanup(priv->dev);
1333
1334 device_init_failed:
1335 free_netdev(priv->dev);
1336
1337 alloc_mem_failed:
1338 return ERR_PTR(result);
1339 }
1340
1341 static void ipoib_add_one(struct ib_device *device)
1342 {
1343 struct list_head *dev_list;
1344 struct net_device *dev;
1345 struct ipoib_dev_priv *priv;
1346 int s, e, p;
1347
1348 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1349 return;
1350
1351 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1352 if (!dev_list)
1353 return;
1354
1355 INIT_LIST_HEAD(dev_list);
1356
1357 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1358 s = 0;
1359 e = 0;
1360 } else {
1361 s = 1;
1362 e = device->phys_port_cnt;
1363 }
1364
1365 for (p = s; p <= e; ++p) {
1366 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1367 continue;
1368 dev = ipoib_add_port("ib%d", device, p);
1369 if (!IS_ERR(dev)) {
1370 priv = netdev_priv(dev);
1371 list_add_tail(&priv->list, dev_list);
1372 }
1373 }
1374
1375 ib_set_client_data(device, &ipoib_client, dev_list);
1376 }
1377
1378 static void ipoib_remove_one(struct ib_device *device)
1379 {
1380 struct ipoib_dev_priv *priv, *tmp;
1381 struct list_head *dev_list;
1382
1383 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1384 return;
1385
1386 dev_list = ib_get_client_data(device, &ipoib_client);
1387
1388 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1389 ib_unregister_event_handler(&priv->event_handler);
1390
1391 rtnl_lock();
1392 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1393 rtnl_unlock();
1394
1395 flush_workqueue(ipoib_workqueue);
1396
1397 unregister_netdev(priv->dev);
1398 ipoib_dev_cleanup(priv->dev);
1399 free_netdev(priv->dev);
1400 }
1401
1402 kfree(dev_list);
1403 }
1404
1405 static int __init ipoib_init_module(void)
1406 {
1407 int ret;
1408
1409 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1410 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1411 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1412
1413 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1414 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1415 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1416 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1417 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1418 #endif
1419
1420 /*
1421 * When copying small received packets, we only copy from the
1422 * linear data part of the SKB, so we rely on this condition.
1423 */
1424 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1425
1426 ret = ipoib_register_debugfs();
1427 if (ret)
1428 return ret;
1429
1430 /*
1431 * We create our own workqueue mainly because we want to be
1432 * able to flush it when devices are being removed. We can't
1433 * use schedule_work()/flush_scheduled_work() because both
1434 * unregister_netdev() and linkwatch_event take the rtnl lock,
1435 * so flush_scheduled_work() can deadlock during device
1436 * removal.
1437 */
1438 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1439 if (!ipoib_workqueue) {
1440 ret = -ENOMEM;
1441 goto err_fs;
1442 }
1443
1444 ib_sa_register_client(&ipoib_sa_client);
1445
1446 ret = ib_register_client(&ipoib_client);
1447 if (ret)
1448 goto err_sa;
1449
1450 return 0;
1451
1452 err_sa:
1453 ib_sa_unregister_client(&ipoib_sa_client);
1454 destroy_workqueue(ipoib_workqueue);
1455
1456 err_fs:
1457 ipoib_unregister_debugfs();
1458
1459 return ret;
1460 }
1461
1462 static void __exit ipoib_cleanup_module(void)
1463 {
1464 ib_unregister_client(&ipoib_client);
1465 ib_sa_unregister_client(&ipoib_sa_client);
1466 ipoib_unregister_debugfs();
1467 destroy_workqueue(ipoib_workqueue);
1468 }
1469
1470 module_init(ipoib_init_module);
1471 module_exit(ipoib_cleanup_module);
Linus' kernel tree