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IPoIB: Fix hang in napi_disable() if P_Key is never found
[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 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 if (!test_and_set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
110 napi_enable(&priv->napi);
111
112 if (ipoib_pkey_dev_delay_open(dev))
113 return 0;
114
115 if (ipoib_ib_dev_open(dev))
116 goto err_disable;
117
118 if (ipoib_ib_dev_up(dev))
119 goto err_stop;
120
121 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
122 struct ipoib_dev_priv *cpriv;
123
124 /* Bring up any child interfaces too */
125 mutex_lock(&priv->vlan_mutex);
126 list_for_each_entry(cpriv, &priv->child_intfs, list) {
127 int flags;
128
129 flags = cpriv->dev->flags;
130 if (flags & IFF_UP)
131 continue;
132
133 dev_change_flags(cpriv->dev, flags | IFF_UP);
134 }
135 mutex_unlock(&priv->vlan_mutex);
136 }
137
138 netif_start_queue(dev);
139
140 return 0;
141
142 err_stop:
143 ipoib_ib_dev_stop(dev, 1);
144
145 err_disable:
146 napi_disable(&priv->napi);
147 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
148
149 return -EINVAL;
150 }
151
152 static int ipoib_stop(struct net_device *dev)
153 {
154 struct ipoib_dev_priv *priv = netdev_priv(dev);
155
156 ipoib_dbg(priv, "stopping interface\n");
157
158 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
159 napi_disable(&priv->napi);
160
161 netif_stop_queue(dev);
162
163 ipoib_ib_dev_down(dev, 0);
164 ipoib_ib_dev_stop(dev, 0);
165
166 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
167 struct ipoib_dev_priv *cpriv;
168
169 /* Bring down any child interfaces too */
170 mutex_lock(&priv->vlan_mutex);
171 list_for_each_entry(cpriv, &priv->child_intfs, list) {
172 int flags;
173
174 flags = cpriv->dev->flags;
175 if (!(flags & IFF_UP))
176 continue;
177
178 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
179 }
180 mutex_unlock(&priv->vlan_mutex);
181 }
182
183 return 0;
184 }
185
186 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
187 {
188 struct ipoib_dev_priv *priv = netdev_priv(dev);
189
190 /* dev->mtu > 2K ==> connected mode */
191 if (ipoib_cm_admin_enabled(dev)) {
192 if (new_mtu > ipoib_cm_max_mtu(dev))
193 return -EINVAL;
194
195 if (new_mtu > priv->mcast_mtu)
196 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
197 priv->mcast_mtu);
198
199 dev->mtu = new_mtu;
200 return 0;
201 }
202
203 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
204 return -EINVAL;
205
206 priv->admin_mtu = new_mtu;
207
208 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
209
210 return 0;
211 }
212
213 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
214 {
215 struct ipoib_dev_priv *priv = netdev_priv(dev);
216 struct rb_node *n = priv->path_tree.rb_node;
217 struct ipoib_path *path;
218 int ret;
219
220 while (n) {
221 path = rb_entry(n, struct ipoib_path, rb_node);
222
223 ret = memcmp(gid, path->pathrec.dgid.raw,
224 sizeof (union ib_gid));
225
226 if (ret < 0)
227 n = n->rb_left;
228 else if (ret > 0)
229 n = n->rb_right;
230 else
231 return path;
232 }
233
234 return NULL;
235 }
236
237 static int __path_add(struct net_device *dev, struct ipoib_path *path)
238 {
239 struct ipoib_dev_priv *priv = netdev_priv(dev);
240 struct rb_node **n = &priv->path_tree.rb_node;
241 struct rb_node *pn = NULL;
242 struct ipoib_path *tpath;
243 int ret;
244
245 while (*n) {
246 pn = *n;
247 tpath = rb_entry(pn, struct ipoib_path, rb_node);
248
249 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
250 sizeof (union ib_gid));
251 if (ret < 0)
252 n = &pn->rb_left;
253 else if (ret > 0)
254 n = &pn->rb_right;
255 else
256 return -EEXIST;
257 }
258
259 rb_link_node(&path->rb_node, pn, n);
260 rb_insert_color(&path->rb_node, &priv->path_tree);
261
262 list_add_tail(&path->list, &priv->path_list);
263
264 return 0;
265 }
266
267 static void path_free(struct net_device *dev, struct ipoib_path *path)
268 {
269 struct ipoib_dev_priv *priv = netdev_priv(dev);
270 struct ipoib_neigh *neigh, *tn;
271 struct sk_buff *skb;
272 unsigned long flags;
273
274 while ((skb = __skb_dequeue(&path->queue)))
275 dev_kfree_skb_irq(skb);
276
277 spin_lock_irqsave(&priv->lock, flags);
278
279 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
280 /*
281 * It's safe to call ipoib_put_ah() inside priv->lock
282 * here, because we know that path->ah will always
283 * hold one more reference, so ipoib_put_ah() will
284 * never do more than decrement the ref count.
285 */
286 if (neigh->ah)
287 ipoib_put_ah(neigh->ah);
288
289 ipoib_neigh_free(dev, neigh);
290 }
291
292 spin_unlock_irqrestore(&priv->lock, flags);
293
294 if (path->ah)
295 ipoib_put_ah(path->ah);
296
297 kfree(path);
298 }
299
300 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
301
302 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
303 {
304 struct ipoib_path_iter *iter;
305
306 iter = kmalloc(sizeof *iter, GFP_KERNEL);
307 if (!iter)
308 return NULL;
309
310 iter->dev = dev;
311 memset(iter->path.pathrec.dgid.raw, 0, 16);
312
313 if (ipoib_path_iter_next(iter)) {
314 kfree(iter);
315 return NULL;
316 }
317
318 return iter;
319 }
320
321 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
322 {
323 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
324 struct rb_node *n;
325 struct ipoib_path *path;
326 int ret = 1;
327
328 spin_lock_irq(&priv->lock);
329
330 n = rb_first(&priv->path_tree);
331
332 while (n) {
333 path = rb_entry(n, struct ipoib_path, rb_node);
334
335 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
336 sizeof (union ib_gid)) < 0) {
337 iter->path = *path;
338 ret = 0;
339 break;
340 }
341
342 n = rb_next(n);
343 }
344
345 spin_unlock_irq(&priv->lock);
346
347 return ret;
348 }
349
350 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
351 struct ipoib_path *path)
352 {
353 *path = iter->path;
354 }
355
356 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
357
358 void ipoib_mark_paths_invalid(struct net_device *dev)
359 {
360 struct ipoib_dev_priv *priv = netdev_priv(dev);
361 struct ipoib_path *path, *tp;
362
363 spin_lock_irq(&priv->lock);
364
365 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
366 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
367 be16_to_cpu(path->pathrec.dlid),
368 path->pathrec.dgid.raw);
369 path->valid = 0;
370 }
371
372 spin_unlock_irq(&priv->lock);
373 }
374
375 void ipoib_flush_paths(struct net_device *dev)
376 {
377 struct ipoib_dev_priv *priv = netdev_priv(dev);
378 struct ipoib_path *path, *tp;
379 LIST_HEAD(remove_list);
380 unsigned long flags;
381
382 netif_tx_lock_bh(dev);
383 spin_lock_irqsave(&priv->lock, flags);
384
385 list_splice_init(&priv->path_list, &remove_list);
386
387 list_for_each_entry(path, &remove_list, list)
388 rb_erase(&path->rb_node, &priv->path_tree);
389
390 list_for_each_entry_safe(path, tp, &remove_list, list) {
391 if (path->query)
392 ib_sa_cancel_query(path->query_id, path->query);
393 spin_unlock_irqrestore(&priv->lock, flags);
394 netif_tx_unlock_bh(dev);
395 wait_for_completion(&path->done);
396 path_free(dev, path);
397 netif_tx_lock_bh(dev);
398 spin_lock_irqsave(&priv->lock, flags);
399 }
400
401 spin_unlock_irqrestore(&priv->lock, flags);
402 netif_tx_unlock_bh(dev);
403 }
404
405 static void path_rec_completion(int status,
406 struct ib_sa_path_rec *pathrec,
407 void *path_ptr)
408 {
409 struct ipoib_path *path = path_ptr;
410 struct net_device *dev = path->dev;
411 struct ipoib_dev_priv *priv = netdev_priv(dev);
412 struct ipoib_ah *ah = NULL;
413 struct ipoib_ah *old_ah = NULL;
414 struct ipoib_neigh *neigh, *tn;
415 struct sk_buff_head skqueue;
416 struct sk_buff *skb;
417 unsigned long flags;
418
419 if (!status)
420 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
421 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
422 else
423 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
424 status, path->pathrec.dgid.raw);
425
426 skb_queue_head_init(&skqueue);
427
428 if (!status) {
429 struct ib_ah_attr av;
430
431 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
432 ah = ipoib_create_ah(dev, priv->pd, &av);
433 }
434
435 spin_lock_irqsave(&priv->lock, flags);
436
437 if (ah) {
438 path->pathrec = *pathrec;
439
440 old_ah = path->ah;
441 path->ah = ah;
442
443 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
444 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
445
446 while ((skb = __skb_dequeue(&path->queue)))
447 __skb_queue_tail(&skqueue, skb);
448
449 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
450 if (neigh->ah) {
451 WARN_ON(neigh->ah != old_ah);
452 /*
453 * Dropping the ah reference inside
454 * priv->lock is safe here, because we
455 * will hold one more reference from
456 * the original value of path->ah (ie
457 * old_ah).
458 */
459 ipoib_put_ah(neigh->ah);
460 }
461 kref_get(&path->ah->ref);
462 neigh->ah = path->ah;
463 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
464 sizeof(union ib_gid));
465
466 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
467 if (!ipoib_cm_get(neigh))
468 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
469 path,
470 neigh));
471 if (!ipoib_cm_get(neigh)) {
472 list_del(&neigh->list);
473 if (neigh->ah)
474 ipoib_put_ah(neigh->ah);
475 ipoib_neigh_free(dev, neigh);
476 continue;
477 }
478 }
479
480 while ((skb = __skb_dequeue(&neigh->queue)))
481 __skb_queue_tail(&skqueue, skb);
482 }
483 path->valid = 1;
484 }
485
486 path->query = NULL;
487 complete(&path->done);
488
489 spin_unlock_irqrestore(&priv->lock, flags);
490
491 if (old_ah)
492 ipoib_put_ah(old_ah);
493
494 while ((skb = __skb_dequeue(&skqueue))) {
495 skb->dev = dev;
496 if (dev_queue_xmit(skb))
497 ipoib_warn(priv, "dev_queue_xmit failed "
498 "to requeue packet\n");
499 }
500 }
501
502 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
503 {
504 struct ipoib_dev_priv *priv = netdev_priv(dev);
505 struct ipoib_path *path;
506
507 if (!priv->broadcast)
508 return NULL;
509
510 path = kzalloc(sizeof *path, GFP_ATOMIC);
511 if (!path)
512 return NULL;
513
514 path->dev = dev;
515
516 skb_queue_head_init(&path->queue);
517
518 INIT_LIST_HEAD(&path->neigh_list);
519
520 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
521 path->pathrec.sgid = priv->local_gid;
522 path->pathrec.pkey = cpu_to_be16(priv->pkey);
523 path->pathrec.numb_path = 1;
524 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
525
526 return path;
527 }
528
529 static int path_rec_start(struct net_device *dev,
530 struct ipoib_path *path)
531 {
532 struct ipoib_dev_priv *priv = netdev_priv(dev);
533
534 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
535 path->pathrec.dgid.raw);
536
537 init_completion(&path->done);
538
539 path->query_id =
540 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
541 &path->pathrec,
542 IB_SA_PATH_REC_DGID |
543 IB_SA_PATH_REC_SGID |
544 IB_SA_PATH_REC_NUMB_PATH |
545 IB_SA_PATH_REC_TRAFFIC_CLASS |
546 IB_SA_PATH_REC_PKEY,
547 1000, GFP_ATOMIC,
548 path_rec_completion,
549 path, &path->query);
550 if (path->query_id < 0) {
551 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
552 path->query = NULL;
553 complete(&path->done);
554 return path->query_id;
555 }
556
557 return 0;
558 }
559
560 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
561 {
562 struct ipoib_dev_priv *priv = netdev_priv(dev);
563 struct ipoib_path *path;
564 struct ipoib_neigh *neigh;
565 unsigned long flags;
566
567 neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
568 if (!neigh) {
569 ++dev->stats.tx_dropped;
570 dev_kfree_skb_any(skb);
571 return;
572 }
573
574 spin_lock_irqsave(&priv->lock, flags);
575
576 path = __path_find(dev, skb->dst->neighbour->ha + 4);
577 if (!path) {
578 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
579 if (!path)
580 goto err_path;
581
582 __path_add(dev, path);
583 }
584
585 list_add_tail(&neigh->list, &path->neigh_list);
586
587 if (path->ah) {
588 kref_get(&path->ah->ref);
589 neigh->ah = path->ah;
590 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
591 sizeof(union ib_gid));
592
593 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
594 if (!ipoib_cm_get(neigh))
595 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
596 if (!ipoib_cm_get(neigh)) {
597 list_del(&neigh->list);
598 if (neigh->ah)
599 ipoib_put_ah(neigh->ah);
600 ipoib_neigh_free(dev, neigh);
601 goto err_drop;
602 }
603 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
604 __skb_queue_tail(&neigh->queue, skb);
605 else {
606 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
607 skb_queue_len(&neigh->queue));
608 goto err_drop;
609 }
610 } else
611 ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
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->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->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
648 skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
649 ipoib_mcast_send(dev, skb->dst->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 if (!path)
664 path = path_rec_create(dev, phdr->hwaddr + 4);
665 if (path) {
666 /* put pseudoheader back on for next time */
667 skb_push(skb, sizeof *phdr);
668 __skb_queue_tail(&path->queue, skb);
669
670 if (!path->query && path_rec_start(dev, path)) {
671 spin_unlock_irqrestore(&priv->lock, flags);
672 path_free(dev, path);
673 return;
674 } else
675 __path_add(dev, path);
676 } else {
677 ++dev->stats.tx_dropped;
678 dev_kfree_skb_any(skb);
679 }
680
681 spin_unlock_irqrestore(&priv->lock, flags);
682 return;
683 }
684
685 if (path->ah) {
686 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
687 be16_to_cpu(path->pathrec.dlid));
688
689 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
690 } else if ((path->query || !path_rec_start(dev, path)) &&
691 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
692 /* put pseudoheader back on for next time */
693 skb_push(skb, sizeof *phdr);
694 __skb_queue_tail(&path->queue, skb);
695 } else {
696 ++dev->stats.tx_dropped;
697 dev_kfree_skb_any(skb);
698 }
699
700 spin_unlock_irqrestore(&priv->lock, flags);
701 }
702
703 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
704 {
705 struct ipoib_dev_priv *priv = netdev_priv(dev);
706 struct ipoib_neigh *neigh;
707 unsigned long flags;
708
709 if (likely(skb->dst && skb->dst->neighbour)) {
710 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
711 ipoib_path_lookup(skb, dev);
712 return NETDEV_TX_OK;
713 }
714
715 neigh = *to_ipoib_neigh(skb->dst->neighbour);
716
717 if (unlikely((memcmp(&neigh->dgid.raw,
718 skb->dst->neighbour->ha + 4,
719 sizeof(union ib_gid))) ||
720 (neigh->dev != dev))) {
721 spin_lock_irqsave(&priv->lock, flags);
722 /*
723 * It's safe to call ipoib_put_ah() inside
724 * priv->lock here, because we know that
725 * path->ah will always hold one more reference,
726 * so ipoib_put_ah() will never do more than
727 * decrement the ref count.
728 */
729 if (neigh->ah)
730 ipoib_put_ah(neigh->ah);
731 list_del(&neigh->list);
732 ipoib_neigh_free(dev, neigh);
733 spin_unlock_irqrestore(&priv->lock, flags);
734 ipoib_path_lookup(skb, dev);
735 return NETDEV_TX_OK;
736 }
737
738 if (ipoib_cm_get(neigh)) {
739 if (ipoib_cm_up(neigh)) {
740 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
741 return NETDEV_TX_OK;
742 }
743 } else if (neigh->ah) {
744 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
745 return NETDEV_TX_OK;
746 }
747
748 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
749 spin_lock_irqsave(&priv->lock, flags);
750 __skb_queue_tail(&neigh->queue, skb);
751 spin_unlock_irqrestore(&priv->lock, flags);
752 } else {
753 ++dev->stats.tx_dropped;
754 dev_kfree_skb_any(skb);
755 }
756 } else {
757 struct ipoib_pseudoheader *phdr =
758 (struct ipoib_pseudoheader *) skb->data;
759 skb_pull(skb, sizeof *phdr);
760
761 if (phdr->hwaddr[4] == 0xff) {
762 /* Add in the P_Key for multicast*/
763 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
764 phdr->hwaddr[9] = priv->pkey & 0xff;
765
766 ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
767 } else {
768 /* unicast GID -- should be ARP or RARP reply */
769
770 if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
771 (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
772 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x %pI6\n",
773 skb->dst ? "neigh" : "dst",
774 be16_to_cpup((__be16 *) skb->data),
775 IPOIB_QPN(phdr->hwaddr),
776 phdr->hwaddr + 4);
777 dev_kfree_skb_any(skb);
778 ++dev->stats.tx_dropped;
779 return NETDEV_TX_OK;
780 }
781
782 unicast_arp_send(skb, dev, phdr);
783 }
784 }
785
786 return NETDEV_TX_OK;
787 }
788
789 static void ipoib_timeout(struct net_device *dev)
790 {
791 struct ipoib_dev_priv *priv = netdev_priv(dev);
792
793 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
794 jiffies_to_msecs(jiffies - dev->trans_start));
795 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
796 netif_queue_stopped(dev),
797 priv->tx_head, priv->tx_tail);
798 /* XXX reset QP, etc. */
799 }
800
801 static int ipoib_hard_header(struct sk_buff *skb,
802 struct net_device *dev,
803 unsigned short type,
804 const void *daddr, const void *saddr, unsigned len)
805 {
806 struct ipoib_header *header;
807
808 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
809
810 header->proto = htons(type);
811 header->reserved = 0;
812
813 /*
814 * If we don't have a neighbour structure, stuff the
815 * destination address onto the front of the skb so we can
816 * figure out where to send the packet later.
817 */
818 if ((!skb->dst || !skb->dst->neighbour) && daddr) {
819 struct ipoib_pseudoheader *phdr =
820 (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
821 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
822 }
823
824 return 0;
825 }
826
827 static void ipoib_set_mcast_list(struct net_device *dev)
828 {
829 struct ipoib_dev_priv *priv = netdev_priv(dev);
830
831 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
832 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
833 return;
834 }
835
836 queue_work(ipoib_workqueue, &priv->restart_task);
837 }
838
839 static void ipoib_neigh_cleanup(struct neighbour *n)
840 {
841 struct ipoib_neigh *neigh;
842 struct ipoib_dev_priv *priv = netdev_priv(n->dev);
843 unsigned long flags;
844 struct ipoib_ah *ah = NULL;
845
846 neigh = *to_ipoib_neigh(n);
847 if (neigh)
848 priv = netdev_priv(neigh->dev);
849 else
850 return;
851 ipoib_dbg(priv,
852 "neigh_cleanup for %06x %pI6\n",
853 IPOIB_QPN(n->ha),
854 n->ha + 4);
855
856 spin_lock_irqsave(&priv->lock, flags);
857
858 if (neigh->ah)
859 ah = neigh->ah;
860 list_del(&neigh->list);
861 ipoib_neigh_free(n->dev, neigh);
862
863 spin_unlock_irqrestore(&priv->lock, flags);
864
865 if (ah)
866 ipoib_put_ah(ah);
867 }
868
869 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
870 struct net_device *dev)
871 {
872 struct ipoib_neigh *neigh;
873
874 neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
875 if (!neigh)
876 return NULL;
877
878 neigh->neighbour = neighbour;
879 neigh->dev = dev;
880 *to_ipoib_neigh(neighbour) = neigh;
881 skb_queue_head_init(&neigh->queue);
882 ipoib_cm_set(neigh, NULL);
883
884 return neigh;
885 }
886
887 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
888 {
889 struct sk_buff *skb;
890 *to_ipoib_neigh(neigh->neighbour) = NULL;
891 while ((skb = __skb_dequeue(&neigh->queue))) {
892 ++dev->stats.tx_dropped;
893 dev_kfree_skb_any(skb);
894 }
895 if (ipoib_cm_get(neigh))
896 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
897 kfree(neigh);
898 }
899
900 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
901 {
902 parms->neigh_cleanup = ipoib_neigh_cleanup;
903
904 return 0;
905 }
906
907 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
908 {
909 struct ipoib_dev_priv *priv = netdev_priv(dev);
910
911 /* Allocate RX/TX "rings" to hold queued skbs */
912 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
913 GFP_KERNEL);
914 if (!priv->rx_ring) {
915 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
916 ca->name, ipoib_recvq_size);
917 goto out;
918 }
919
920 priv->tx_ring = vmalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
921 if (!priv->tx_ring) {
922 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
923 ca->name, ipoib_sendq_size);
924 goto out_rx_ring_cleanup;
925 }
926 memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring);
927
928 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
929
930 if (ipoib_ib_dev_init(dev, ca, port))
931 goto out_tx_ring_cleanup;
932
933 return 0;
934
935 out_tx_ring_cleanup:
936 vfree(priv->tx_ring);
937
938 out_rx_ring_cleanup:
939 kfree(priv->rx_ring);
940
941 out:
942 return -ENOMEM;
943 }
944
945 void ipoib_dev_cleanup(struct net_device *dev)
946 {
947 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
948
949 ipoib_delete_debug_files(dev);
950
951 /* Delete any child interfaces first */
952 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
953 unregister_netdev(cpriv->dev);
954 ipoib_dev_cleanup(cpriv->dev);
955 free_netdev(cpriv->dev);
956 }
957
958 ipoib_ib_dev_cleanup(dev);
959
960 kfree(priv->rx_ring);
961 vfree(priv->tx_ring);
962
963 priv->rx_ring = NULL;
964 priv->tx_ring = NULL;
965 }
966
967 static const struct header_ops ipoib_header_ops = {
968 .create = ipoib_hard_header,
969 };
970
971 static int get_skb_hdr(struct sk_buff *skb, void **iphdr,
972 void **tcph, u64 *hdr_flags, void *priv)
973 {
974 unsigned int ip_len;
975 struct iphdr *iph;
976
977 if (unlikely(skb->protocol != htons(ETH_P_IP)))
978 return -1;
979
980 /*
981 * In the future we may add an else clause that verifies the
982 * checksum and allows devices which do not calculate checksum
983 * to use LRO.
984 */
985 if (unlikely(skb->ip_summed != CHECKSUM_UNNECESSARY))
986 return -1;
987
988 /* Check for non-TCP packet */
989 skb_reset_network_header(skb);
990 iph = ip_hdr(skb);
991 if (iph->protocol != IPPROTO_TCP)
992 return -1;
993
994 ip_len = ip_hdrlen(skb);
995 skb_set_transport_header(skb, ip_len);
996 *tcph = tcp_hdr(skb);
997
998 /* check if IP header and TCP header are complete */
999 if (ntohs(iph->tot_len) < ip_len + tcp_hdrlen(skb))
1000 return -1;
1001
1002 *hdr_flags = LRO_IPV4 | LRO_TCP;
1003 *iphdr = iph;
1004
1005 return 0;
1006 }
1007
1008 static void ipoib_lro_setup(struct ipoib_dev_priv *priv)
1009 {
1010 priv->lro.lro_mgr.max_aggr = lro_max_aggr;
1011 priv->lro.lro_mgr.max_desc = IPOIB_MAX_LRO_DESCRIPTORS;
1012 priv->lro.lro_mgr.lro_arr = priv->lro.lro_desc;
1013 priv->lro.lro_mgr.get_skb_header = get_skb_hdr;
1014 priv->lro.lro_mgr.features = LRO_F_NAPI;
1015 priv->lro.lro_mgr.dev = priv->dev;
1016 priv->lro.lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
1017 }
1018
1019 static void ipoib_setup(struct net_device *dev)
1020 {
1021 struct ipoib_dev_priv *priv = netdev_priv(dev);
1022
1023 dev->open = ipoib_open;
1024 dev->stop = ipoib_stop;
1025 dev->change_mtu = ipoib_change_mtu;
1026 dev->hard_start_xmit = ipoib_start_xmit;
1027 dev->tx_timeout = ipoib_timeout;
1028 dev->header_ops = &ipoib_header_ops;
1029 dev->set_multicast_list = ipoib_set_mcast_list;
1030 dev->neigh_setup = ipoib_neigh_setup_dev;
1031
1032 ipoib_set_ethtool_ops(dev);
1033
1034 netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1035
1036 dev->watchdog_timeo = HZ;
1037
1038 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
1039
1040 /*
1041 * We add in INFINIBAND_ALEN to allow for the destination
1042 * address "pseudoheader" for skbs without neighbour struct.
1043 */
1044 dev->hard_header_len = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
1045 dev->addr_len = INFINIBAND_ALEN;
1046 dev->type = ARPHRD_INFINIBAND;
1047 dev->tx_queue_len = ipoib_sendq_size * 2;
1048 dev->features = (NETIF_F_VLAN_CHALLENGED |
1049 NETIF_F_HIGHDMA);
1050
1051 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1052
1053 netif_carrier_off(dev);
1054
1055 priv->dev = dev;
1056
1057 ipoib_lro_setup(priv);
1058
1059 spin_lock_init(&priv->lock);
1060
1061 mutex_init(&priv->vlan_mutex);
1062
1063 INIT_LIST_HEAD(&priv->path_list);
1064 INIT_LIST_HEAD(&priv->child_intfs);
1065 INIT_LIST_HEAD(&priv->dead_ahs);
1066 INIT_LIST_HEAD(&priv->multicast_list);
1067
1068 INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1069 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1070 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1071 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
1072 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
1073 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
1074 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1075 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1076 }
1077
1078 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1079 {
1080 struct net_device *dev;
1081
1082 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1083 ipoib_setup);
1084 if (!dev)
1085 return NULL;
1086
1087 return netdev_priv(dev);
1088 }
1089
1090 static ssize_t show_pkey(struct device *dev,
1091 struct device_attribute *attr, char *buf)
1092 {
1093 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1094
1095 return sprintf(buf, "0x%04x\n", priv->pkey);
1096 }
1097 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1098
1099 static ssize_t show_umcast(struct device *dev,
1100 struct device_attribute *attr, char *buf)
1101 {
1102 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1103
1104 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1105 }
1106
1107 static ssize_t set_umcast(struct device *dev,
1108 struct device_attribute *attr,
1109 const char *buf, size_t count)
1110 {
1111 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1112 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1113
1114 if (umcast_val > 0) {
1115 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1116 ipoib_warn(priv, "ignoring multicast groups joined directly "
1117 "by userspace\n");
1118 } else
1119 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1120
1121 return count;
1122 }
1123 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1124
1125 int ipoib_add_umcast_attr(struct net_device *dev)
1126 {
1127 return device_create_file(&dev->dev, &dev_attr_umcast);
1128 }
1129
1130 static ssize_t create_child(struct device *dev,
1131 struct device_attribute *attr,
1132 const char *buf, size_t count)
1133 {
1134 int pkey;
1135 int ret;
1136
1137 if (sscanf(buf, "%i", &pkey) != 1)
1138 return -EINVAL;
1139
1140 if (pkey < 0 || pkey > 0xffff)
1141 return -EINVAL;
1142
1143 /*
1144 * Set the full membership bit, so that we join the right
1145 * broadcast group, etc.
1146 */
1147 pkey |= 0x8000;
1148
1149 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1150
1151 return ret ? ret : count;
1152 }
1153 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1154
1155 static ssize_t delete_child(struct device *dev,
1156 struct device_attribute *attr,
1157 const char *buf, size_t count)
1158 {
1159 int pkey;
1160 int ret;
1161
1162 if (sscanf(buf, "%i", &pkey) != 1)
1163 return -EINVAL;
1164
1165 if (pkey < 0 || pkey > 0xffff)
1166 return -EINVAL;
1167
1168 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1169
1170 return ret ? ret : count;
1171
1172 }
1173 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1174
1175 int ipoib_add_pkey_attr(struct net_device *dev)
1176 {
1177 return device_create_file(&dev->dev, &dev_attr_pkey);
1178 }
1179
1180 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1181 {
1182 struct ib_device_attr *device_attr;
1183 int result = -ENOMEM;
1184
1185 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1186 if (!device_attr) {
1187 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1188 hca->name, sizeof *device_attr);
1189 return result;
1190 }
1191
1192 result = ib_query_device(hca, device_attr);
1193 if (result) {
1194 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1195 hca->name, result);
1196 kfree(device_attr);
1197 return result;
1198 }
1199 priv->hca_caps = device_attr->device_cap_flags;
1200
1201 kfree(device_attr);
1202
1203 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1204 set_bit(IPOIB_FLAG_CSUM, &priv->flags);
1205 priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
1206 }
1207
1208 if (lro)
1209 priv->dev->features |= NETIF_F_LRO;
1210
1211 if (priv->dev->features & NETIF_F_SG && priv->hca_caps & IB_DEVICE_UD_TSO)
1212 priv->dev->features |= NETIF_F_TSO;
1213
1214 return 0;
1215 }
1216
1217
1218 static struct net_device *ipoib_add_port(const char *format,
1219 struct ib_device *hca, u8 port)
1220 {
1221 struct ipoib_dev_priv *priv;
1222 struct ib_port_attr attr;
1223 int result = -ENOMEM;
1224
1225 priv = ipoib_intf_alloc(format);
1226 if (!priv)
1227 goto alloc_mem_failed;
1228
1229 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1230
1231 if (!ib_query_port(hca, port, &attr))
1232 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1233 else {
1234 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1235 hca->name, port);
1236 goto device_init_failed;
1237 }
1238
1239 /* MTU will be reset when mcast join happens */
1240 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1241 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
1242
1243 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1244 if (result) {
1245 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1246 hca->name, port, result);
1247 goto device_init_failed;
1248 }
1249
1250 if (ipoib_set_dev_features(priv, hca))
1251 goto device_init_failed;
1252
1253 /*
1254 * Set the full membership bit, so that we join the right
1255 * broadcast group, etc.
1256 */
1257 priv->pkey |= 0x8000;
1258
1259 priv->dev->broadcast[8] = priv->pkey >> 8;
1260 priv->dev->broadcast[9] = priv->pkey & 0xff;
1261
1262 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1263 if (result) {
1264 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1265 hca->name, port, result);
1266 goto device_init_failed;
1267 } else
1268 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1269
1270 result = ipoib_dev_init(priv->dev, hca, port);
1271 if (result < 0) {
1272 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1273 hca->name, port, result);
1274 goto device_init_failed;
1275 }
1276
1277 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1278 priv->ca, ipoib_event);
1279 result = ib_register_event_handler(&priv->event_handler);
1280 if (result < 0) {
1281 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1282 "port %d (ret = %d)\n",
1283 hca->name, port, result);
1284 goto event_failed;
1285 }
1286
1287 result = register_netdev(priv->dev);
1288 if (result) {
1289 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1290 hca->name, port, result);
1291 goto register_failed;
1292 }
1293
1294 ipoib_create_debug_files(priv->dev);
1295
1296 if (ipoib_cm_add_mode_attr(priv->dev))
1297 goto sysfs_failed;
1298 if (ipoib_add_pkey_attr(priv->dev))
1299 goto sysfs_failed;
1300 if (ipoib_add_umcast_attr(priv->dev))
1301 goto sysfs_failed;
1302 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1303 goto sysfs_failed;
1304 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1305 goto sysfs_failed;
1306
1307 return priv->dev;
1308
1309 sysfs_failed:
1310 ipoib_delete_debug_files(priv->dev);
1311 unregister_netdev(priv->dev);
1312
1313 register_failed:
1314 ib_unregister_event_handler(&priv->event_handler);
1315 flush_workqueue(ipoib_workqueue);
1316
1317 event_failed:
1318 ipoib_dev_cleanup(priv->dev);
1319
1320 device_init_failed:
1321 free_netdev(priv->dev);
1322
1323 alloc_mem_failed:
1324 return ERR_PTR(result);
1325 }
1326
1327 static void ipoib_add_one(struct ib_device *device)
1328 {
1329 struct list_head *dev_list;
1330 struct net_device *dev;
1331 struct ipoib_dev_priv *priv;
1332 int s, e, p;
1333
1334 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1335 return;
1336
1337 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1338 if (!dev_list)
1339 return;
1340
1341 INIT_LIST_HEAD(dev_list);
1342
1343 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1344 s = 0;
1345 e = 0;
1346 } else {
1347 s = 1;
1348 e = device->phys_port_cnt;
1349 }
1350
1351 for (p = s; p <= e; ++p) {
1352 dev = ipoib_add_port("ib%d", device, p);
1353 if (!IS_ERR(dev)) {
1354 priv = netdev_priv(dev);
1355 list_add_tail(&priv->list, dev_list);
1356 }
1357 }
1358
1359 ib_set_client_data(device, &ipoib_client, dev_list);
1360 }
1361
1362 static void ipoib_remove_one(struct ib_device *device)
1363 {
1364 struct ipoib_dev_priv *priv, *tmp;
1365 struct list_head *dev_list;
1366
1367 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1368 return;
1369
1370 dev_list = ib_get_client_data(device, &ipoib_client);
1371
1372 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1373 ib_unregister_event_handler(&priv->event_handler);
1374
1375 rtnl_lock();
1376 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1377 rtnl_unlock();
1378
1379 flush_workqueue(ipoib_workqueue);
1380
1381 unregister_netdev(priv->dev);
1382 ipoib_dev_cleanup(priv->dev);
1383 free_netdev(priv->dev);
1384 }
1385
1386 kfree(dev_list);
1387 }
1388
1389 static int __init ipoib_init_module(void)
1390 {
1391 int ret;
1392
1393 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1394 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1395 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1396
1397 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1398 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1399 ipoib_sendq_size = max(ipoib_sendq_size, max(2 * MAX_SEND_CQE,
1400 IPOIB_MIN_QUEUE_SIZE));
1401 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1402 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1403 #endif
1404
1405 /*
1406 * When copying small received packets, we only copy from the
1407 * linear data part of the SKB, so we rely on this condition.
1408 */
1409 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1410
1411 ret = ipoib_register_debugfs();
1412 if (ret)
1413 return ret;
1414
1415 /*
1416 * We create our own workqueue mainly because we want to be
1417 * able to flush it when devices are being removed. We can't
1418 * use schedule_work()/flush_scheduled_work() because both
1419 * unregister_netdev() and linkwatch_event take the rtnl lock,
1420 * so flush_scheduled_work() can deadlock during device
1421 * removal.
1422 */
1423 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1424 if (!ipoib_workqueue) {
1425 ret = -ENOMEM;
1426 goto err_fs;
1427 }
1428
1429 ib_sa_register_client(&ipoib_sa_client);
1430
1431 ret = ib_register_client(&ipoib_client);
1432 if (ret)
1433 goto err_sa;
1434
1435 return 0;
1436
1437 err_sa:
1438 ib_sa_unregister_client(&ipoib_sa_client);
1439 destroy_workqueue(ipoib_workqueue);
1440
1441 err_fs:
1442 ipoib_unregister_debugfs();
1443
1444 return ret;
1445 }
1446
1447 static void __exit ipoib_cleanup_module(void)
1448 {
1449 ib_unregister_client(&ipoib_client);
1450 ib_sa_unregister_client(&ipoib_sa_client);
1451 ipoib_unregister_debugfs();
1452 destroy_workqueue(ipoib_workqueue);
1453 }
1454
1455 module_init(ipoib_init_module);
1456 module_exit(ipoib_cleanup_module);
Linux kernel - Deliverables
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