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[linux-2.6/verdex.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
blob37da8d3dc388d7e781544b28bd334850be33c2ac
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 * $Id: ipoib_main.c 1377 2004-12-23 19:57:12Z roland $
35 */
36
37 #include "ipoib.h"
38
39 #include <linux/module.h>
40
41 #include <linux/init.h>
42 #include <linux/slab.h>
43 #include <linux/vmalloc.h>
44
45 #include <linux/if_arp.h> /* For ARPHRD_xxx */
46
47 #include <linux/ip.h>
48 #include <linux/in.h>
49
50 #include <net/dst.h>
51
52 MODULE_AUTHOR("Roland Dreier");
53 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
54 MODULE_LICENSE("Dual BSD/GPL");
55
56 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
57 int ipoib_debug_level;
58
59 module_param_named(debug_level, ipoib_debug_level, int, 0644);
60 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
61 #endif
62
63 struct ipoib_path_iter {
64 struct net_device *dev;
65 struct ipoib_path path;
66 };
67
68 static const u8 ipv4_bcast_addr[] = {
69 0x00, 0xff, 0xff, 0xff,
70 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
71 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
72 };
73
74 struct workqueue_struct *ipoib_workqueue;
75
76 static void ipoib_add_one(struct ib_device *device);
77 static void ipoib_remove_one(struct ib_device *device);
78
79 static struct ib_client ipoib_client = {
80 .name = "ipoib",
81 .add = ipoib_add_one,
82 .remove = ipoib_remove_one
83 };
84
85 int ipoib_open(struct net_device *dev)
86 {
87 struct ipoib_dev_priv *priv = netdev_priv(dev);
88
89 ipoib_dbg(priv, "bringing up interface\n");
90
91 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
92
93 if (ipoib_pkey_dev_delay_open(dev))
94 return 0;
95
96 if (ipoib_ib_dev_open(dev))
97 return -EINVAL;
98
99 if (ipoib_ib_dev_up(dev)) {
100 ipoib_ib_dev_stop(dev);
101 return -EINVAL;
102 }
103
104 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
105 struct ipoib_dev_priv *cpriv;
106
107 /* Bring up any child interfaces too */
108 mutex_lock(&priv->vlan_mutex);
109 list_for_each_entry(cpriv, &priv->child_intfs, list) {
110 int flags;
111
112 flags = cpriv->dev->flags;
113 if (flags & IFF_UP)
114 continue;
115
116 dev_change_flags(cpriv->dev, flags | IFF_UP);
117 }
118 mutex_unlock(&priv->vlan_mutex);
119 }
120
121 netif_start_queue(dev);
122
123 return 0;
124 }
125
126 static int ipoib_stop(struct net_device *dev)
127 {
128 struct ipoib_dev_priv *priv = netdev_priv(dev);
129
130 ipoib_dbg(priv, "stopping interface\n");
131
132 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
133
134 netif_stop_queue(dev);
135
136 /*
137 * Now flush workqueue to make sure a scheduled task doesn't
138 * bring our internal state back up.
139 */
140 flush_workqueue(ipoib_workqueue);
141
142 ipoib_ib_dev_down(dev, 1);
143 ipoib_ib_dev_stop(dev);
144
145 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
146 struct ipoib_dev_priv *cpriv;
147
148 /* Bring down any child interfaces too */
149 mutex_lock(&priv->vlan_mutex);
150 list_for_each_entry(cpriv, &priv->child_intfs, list) {
151 int flags;
152
153 flags = cpriv->dev->flags;
154 if (!(flags & IFF_UP))
155 continue;
156
157 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
158 }
159 mutex_unlock(&priv->vlan_mutex);
160 }
161
162 return 0;
163 }
164
165 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
166 {
167 struct ipoib_dev_priv *priv = netdev_priv(dev);
168
169 if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN)
170 return -EINVAL;
171
172 priv->admin_mtu = new_mtu;
173
174 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
175
176 return 0;
177 }
178
179 static struct ipoib_path *__path_find(struct net_device *dev,
180 union ib_gid *gid)
181 {
182 struct ipoib_dev_priv *priv = netdev_priv(dev);
183 struct rb_node *n = priv->path_tree.rb_node;
184 struct ipoib_path *path;
185 int ret;
186
187 while (n) {
188 path = rb_entry(n, struct ipoib_path, rb_node);
189
190 ret = memcmp(gid->raw, path->pathrec.dgid.raw,
191 sizeof (union ib_gid));
192
193 if (ret < 0)
194 n = n->rb_left;
195 else if (ret > 0)
196 n = n->rb_right;
197 else
198 return path;
199 }
200
201 return NULL;
202 }
203
204 static int __path_add(struct net_device *dev, struct ipoib_path *path)
205 {
206 struct ipoib_dev_priv *priv = netdev_priv(dev);
207 struct rb_node **n = &priv->path_tree.rb_node;
208 struct rb_node *pn = NULL;
209 struct ipoib_path *tpath;
210 int ret;
211
212 while (*n) {
213 pn = *n;
214 tpath = rb_entry(pn, struct ipoib_path, rb_node);
215
216 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
217 sizeof (union ib_gid));
218 if (ret < 0)
219 n = &pn->rb_left;
220 else if (ret > 0)
221 n = &pn->rb_right;
222 else
223 return -EEXIST;
224 }
225
226 rb_link_node(&path->rb_node, pn, n);
227 rb_insert_color(&path->rb_node, &priv->path_tree);
228
229 list_add_tail(&path->list, &priv->path_list);
230
231 return 0;
232 }
233
234 static void path_free(struct net_device *dev, struct ipoib_path *path)
235 {
236 struct ipoib_dev_priv *priv = netdev_priv(dev);
237 struct ipoib_neigh *neigh, *tn;
238 struct sk_buff *skb;
239 unsigned long flags;
240
241 while ((skb = __skb_dequeue(&path->queue)))
242 dev_kfree_skb_irq(skb);
243
244 spin_lock_irqsave(&priv->lock, flags);
245
246 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
247 /*
248 * It's safe to call ipoib_put_ah() inside priv->lock
249 * here, because we know that path->ah will always
250 * hold one more reference, so ipoib_put_ah() will
251 * never do more than decrement the ref count.
252 */
253 if (neigh->ah)
254 ipoib_put_ah(neigh->ah);
255 *to_ipoib_neigh(neigh->neighbour) = NULL;
256 kfree(neigh);
257 }
258
259 spin_unlock_irqrestore(&priv->lock, flags);
260
261 if (path->ah)
262 ipoib_put_ah(path->ah);
263
264 kfree(path);
265 }
266
267 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
268
269 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
270 {
271 struct ipoib_path_iter *iter;
272
273 iter = kmalloc(sizeof *iter, GFP_KERNEL);
274 if (!iter)
275 return NULL;
276
277 iter->dev = dev;
278 memset(iter->path.pathrec.dgid.raw, 0, 16);
279
280 if (ipoib_path_iter_next(iter)) {
281 kfree(iter);
282 return NULL;
283 }
284
285 return iter;
286 }
287
288 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
289 {
290 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
291 struct rb_node *n;
292 struct ipoib_path *path;
293 int ret = 1;
294
295 spin_lock_irq(&priv->lock);
296
297 n = rb_first(&priv->path_tree);
298
299 while (n) {
300 path = rb_entry(n, struct ipoib_path, rb_node);
301
302 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
303 sizeof (union ib_gid)) < 0) {
304 iter->path = *path;
305 ret = 0;
306 break;
307 }
308
309 n = rb_next(n);
310 }
311
312 spin_unlock_irq(&priv->lock);
313
314 return ret;
315 }
316
317 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
318 struct ipoib_path *path)
319 {
320 *path = iter->path;
321 }
322
323 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
324
325 void ipoib_flush_paths(struct net_device *dev)
326 {
327 struct ipoib_dev_priv *priv = netdev_priv(dev);
328 struct ipoib_path *path, *tp;
329 LIST_HEAD(remove_list);
330 unsigned long flags;
331
332 spin_lock_irqsave(&priv->lock, flags);
333
334 list_splice(&priv->path_list, &remove_list);
335 INIT_LIST_HEAD(&priv->path_list);
336
337 list_for_each_entry(path, &remove_list, list)
338 rb_erase(&path->rb_node, &priv->path_tree);
339
340 spin_unlock_irqrestore(&priv->lock, flags);
341
342 list_for_each_entry_safe(path, tp, &remove_list, list) {
343 if (path->query)
344 ib_sa_cancel_query(path->query_id, path->query);
345 wait_for_completion(&path->done);
346 path_free(dev, path);
347 }
348 }
349
350 static void path_rec_completion(int status,
351 struct ib_sa_path_rec *pathrec,
352 void *path_ptr)
353 {
354 struct ipoib_path *path = path_ptr;
355 struct net_device *dev = path->dev;
356 struct ipoib_dev_priv *priv = netdev_priv(dev);
357 struct ipoib_ah *ah = NULL;
358 struct ipoib_neigh *neigh;
359 struct sk_buff_head skqueue;
360 struct sk_buff *skb;
361 unsigned long flags;
362
363 if (pathrec)
364 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
365 be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
366 else
367 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
368 status, IPOIB_GID_ARG(path->pathrec.dgid));
369
370 skb_queue_head_init(&skqueue);
371
372 if (!status) {
373 struct ib_ah_attr av = {
374 .dlid = be16_to_cpu(pathrec->dlid),
375 .sl = pathrec->sl,
376 .port_num = priv->port
377 };
378 int path_rate = ib_sa_rate_enum_to_int(pathrec->rate);
379
380 if (path_rate > 0 && priv->local_rate > path_rate)
381 av.static_rate = (priv->local_rate - 1) / path_rate;
382
383 ipoib_dbg(priv, "static_rate %d for local port %dX, path %dX\n",
384 av.static_rate, priv->local_rate,
385 ib_sa_rate_enum_to_int(pathrec->rate));
386
387 ah = ipoib_create_ah(dev, priv->pd, &av);
388 }
389
390 spin_lock_irqsave(&priv->lock, flags);
391
392 path->ah = ah;
393
394 if (ah) {
395 path->pathrec = *pathrec;
396
397 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
398 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
399
400 while ((skb = __skb_dequeue(&path->queue)))
401 __skb_queue_tail(&skqueue, skb);
402
403 list_for_each_entry(neigh, &path->neigh_list, list) {
404 kref_get(&path->ah->ref);
405 neigh->ah = path->ah;
406
407 while ((skb = __skb_dequeue(&neigh->queue)))
408 __skb_queue_tail(&skqueue, skb);
409 }
410 }
411
412 path->query = NULL;
413 complete(&path->done);
414
415 spin_unlock_irqrestore(&priv->lock, flags);
416
417 while ((skb = __skb_dequeue(&skqueue))) {
418 skb->dev = dev;
419 if (dev_queue_xmit(skb))
420 ipoib_warn(priv, "dev_queue_xmit failed "
421 "to requeue packet\n");
422 }
423 }
424
425 static struct ipoib_path *path_rec_create(struct net_device *dev,
426 union ib_gid *gid)
427 {
428 struct ipoib_dev_priv *priv = netdev_priv(dev);
429 struct ipoib_path *path;
430
431 path = kzalloc(sizeof *path, GFP_ATOMIC);
432 if (!path)
433 return NULL;
434
435 path->dev = dev;
436
437 skb_queue_head_init(&path->queue);
438
439 INIT_LIST_HEAD(&path->neigh_list);
440
441 memcpy(path->pathrec.dgid.raw, gid->raw, sizeof (union ib_gid));
442 path->pathrec.sgid = priv->local_gid;
443 path->pathrec.pkey = cpu_to_be16(priv->pkey);
444 path->pathrec.numb_path = 1;
445
446 return path;
447 }
448
449 static int path_rec_start(struct net_device *dev,
450 struct ipoib_path *path)
451 {
452 struct ipoib_dev_priv *priv = netdev_priv(dev);
453
454 ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
455 IPOIB_GID_ARG(path->pathrec.dgid));
456
457 init_completion(&path->done);
458
459 path->query_id =
460 ib_sa_path_rec_get(priv->ca, priv->port,
461 &path->pathrec,
462 IB_SA_PATH_REC_DGID |
463 IB_SA_PATH_REC_SGID |
464 IB_SA_PATH_REC_NUMB_PATH |
465 IB_SA_PATH_REC_PKEY,
466 1000, GFP_ATOMIC,
467 path_rec_completion,
468 path, &path->query);
469 if (path->query_id < 0) {
470 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
471 path->query = NULL;
472 return path->query_id;
473 }
474
475 return 0;
476 }
477
478 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
479 {
480 struct ipoib_dev_priv *priv = netdev_priv(dev);
481 struct ipoib_path *path;
482 struct ipoib_neigh *neigh;
483
484 neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
485 if (!neigh) {
486 ++priv->stats.tx_dropped;
487 dev_kfree_skb_any(skb);
488 return;
489 }
490
491 skb_queue_head_init(&neigh->queue);
492 neigh->neighbour = skb->dst->neighbour;
493 *to_ipoib_neigh(skb->dst->neighbour) = neigh;
494
495 /*
496 * We can only be called from ipoib_start_xmit, so we're
497 * inside tx_lock -- no need to save/restore flags.
498 */
499 spin_lock(&priv->lock);
500
501 path = __path_find(dev, (union ib_gid *) (skb->dst->neighbour->ha + 4));
502 if (!path) {
503 path = path_rec_create(dev,
504 (union ib_gid *) (skb->dst->neighbour->ha + 4));
505 if (!path)
506 goto err;
507
508 __path_add(dev, path);
509 }
510
511 list_add_tail(&neigh->list, &path->neigh_list);
512
513 if (path->ah) {
514 kref_get(&path->ah->ref);
515 neigh->ah = path->ah;
516
517 ipoib_send(dev, skb, path->ah,
518 be32_to_cpup((__be32 *) skb->dst->neighbour->ha));
519 } else {
520 neigh->ah = NULL;
521 __skb_queue_tail(&neigh->queue, skb);
522
523 if (!path->query && path_rec_start(dev, path))
524 goto err;
525 }
526
527 spin_unlock(&priv->lock);
528 return;
529
530 err:
531 *to_ipoib_neigh(skb->dst->neighbour) = NULL;
532 list_del(&neigh->list);
533 kfree(neigh);
534
535 ++priv->stats.tx_dropped;
536 dev_kfree_skb_any(skb);
537
538 spin_unlock(&priv->lock);
539 }
540
541 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
542 {
543 struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
544
545 /* Look up path record for unicasts */
546 if (skb->dst->neighbour->ha[4] != 0xff) {
547 neigh_add_path(skb, dev);
548 return;
549 }
550
551 /* Add in the P_Key for multicasts */
552 skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
553 skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
554 ipoib_mcast_send(dev, (union ib_gid *) (skb->dst->neighbour->ha + 4), skb);
555 }
556
557 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
558 struct ipoib_pseudoheader *phdr)
559 {
560 struct ipoib_dev_priv *priv = netdev_priv(dev);
561 struct ipoib_path *path;
562
563 /*
564 * We can only be called from ipoib_start_xmit, so we're
565 * inside tx_lock -- no need to save/restore flags.
566 */
567 spin_lock(&priv->lock);
568
569 path = __path_find(dev, (union ib_gid *) (phdr->hwaddr + 4));
570 if (!path) {
571 path = path_rec_create(dev,
572 (union ib_gid *) (phdr->hwaddr + 4));
573 if (path) {
574 /* put pseudoheader back on for next time */
575 skb_push(skb, sizeof *phdr);
576 __skb_queue_tail(&path->queue, skb);
577
578 if (path_rec_start(dev, path)) {
579 spin_unlock(&priv->lock);
580 path_free(dev, path);
581 return;
582 } else
583 __path_add(dev, path);
584 } else {
585 ++priv->stats.tx_dropped;
586 dev_kfree_skb_any(skb);
587 }
588
589 spin_unlock(&priv->lock);
590 return;
591 }
592
593 if (path->ah) {
594 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
595 be16_to_cpu(path->pathrec.dlid));
596
597 ipoib_send(dev, skb, path->ah,
598 be32_to_cpup((__be32 *) phdr->hwaddr));
599 } else if ((path->query || !path_rec_start(dev, path)) &&
600 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
601 /* put pseudoheader back on for next time */
602 skb_push(skb, sizeof *phdr);
603 __skb_queue_tail(&path->queue, skb);
604 } else {
605 ++priv->stats.tx_dropped;
606 dev_kfree_skb_any(skb);
607 }
608
609 spin_unlock(&priv->lock);
610 }
611
612 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
613 {
614 struct ipoib_dev_priv *priv = netdev_priv(dev);
615 struct ipoib_neigh *neigh;
616 unsigned long flags;
617
618 if (!spin_trylock_irqsave(&priv->tx_lock, flags))
619 return NETDEV_TX_LOCKED;
620
621 /*
622 * Check if our queue is stopped. Since we have the LLTX bit
623 * set, we can't rely on netif_stop_queue() preventing our
624 * xmit function from being called with a full queue.
625 */
626 if (unlikely(netif_queue_stopped(dev))) {
627 spin_unlock_irqrestore(&priv->tx_lock, flags);
628 return NETDEV_TX_BUSY;
629 }
630
631 if (skb->dst && skb->dst->neighbour) {
632 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
633 ipoib_path_lookup(skb, dev);
634 goto out;
635 }
636
637 neigh = *to_ipoib_neigh(skb->dst->neighbour);
638
639 if (likely(neigh->ah)) {
640 ipoib_send(dev, skb, neigh->ah,
641 be32_to_cpup((__be32 *) skb->dst->neighbour->ha));
642 goto out;
643 }
644
645 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
646 spin_lock(&priv->lock);
647 __skb_queue_tail(&neigh->queue, skb);
648 spin_unlock(&priv->lock);
649 } else {
650 ++priv->stats.tx_dropped;
651 dev_kfree_skb_any(skb);
652 }
653 } else {
654 struct ipoib_pseudoheader *phdr =
655 (struct ipoib_pseudoheader *) skb->data;
656 skb_pull(skb, sizeof *phdr);
657
658 if (phdr->hwaddr[4] == 0xff) {
659 /* Add in the P_Key for multicast*/
660 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
661 phdr->hwaddr[9] = priv->pkey & 0xff;
662
663 ipoib_mcast_send(dev, (union ib_gid *) (phdr->hwaddr + 4), skb);
664 } else {
665 /* unicast GID -- should be ARP or RARP reply */
666
667 if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
668 (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
669 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
670 IPOIB_GID_FMT "\n",
671 skb->dst ? "neigh" : "dst",
672 be16_to_cpup((__be16 *) skb->data),
673 be32_to_cpup((__be32 *) phdr->hwaddr),
674 IPOIB_GID_ARG(*(union ib_gid *) (phdr->hwaddr + 4)));
675 dev_kfree_skb_any(skb);
676 ++priv->stats.tx_dropped;
677 goto out;
678 }
679
680 unicast_arp_send(skb, dev, phdr);
681 }
682 }
683
684 out:
685 spin_unlock_irqrestore(&priv->tx_lock, flags);
686
687 return NETDEV_TX_OK;
688 }
689
690 static struct net_device_stats *ipoib_get_stats(struct net_device *dev)
691 {
692 struct ipoib_dev_priv *priv = netdev_priv(dev);
693
694 return &priv->stats;
695 }
696
697 static void ipoib_timeout(struct net_device *dev)
698 {
699 struct ipoib_dev_priv *priv = netdev_priv(dev);
700
701 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
702 jiffies_to_msecs(jiffies - dev->trans_start));
703 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
704 netif_queue_stopped(dev),
705 priv->tx_head, priv->tx_tail);
706 /* XXX reset QP, etc. */
707 }
708
709 static int ipoib_hard_header(struct sk_buff *skb,
710 struct net_device *dev,
711 unsigned short type,
712 void *daddr, void *saddr, unsigned len)
713 {
714 struct ipoib_header *header;
715
716 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
717
718 header->proto = htons(type);
719 header->reserved = 0;
720
721 /*
722 * If we don't have a neighbour structure, stuff the
723 * destination address onto the front of the skb so we can
724 * figure out where to send the packet later.
725 */
726 if (!skb->dst || !skb->dst->neighbour) {
727 struct ipoib_pseudoheader *phdr =
728 (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
729 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
730 }
731
732 return 0;
733 }
734
735 static void ipoib_set_mcast_list(struct net_device *dev)
736 {
737 struct ipoib_dev_priv *priv = netdev_priv(dev);
738
739 queue_work(ipoib_workqueue, &priv->restart_task);
740 }
741
742 static void ipoib_neigh_destructor(struct neighbour *n)
743 {
744 struct ipoib_neigh *neigh;
745 struct ipoib_dev_priv *priv = netdev_priv(n->dev);
746 unsigned long flags;
747 struct ipoib_ah *ah = NULL;
748
749 ipoib_dbg(priv,
750 "neigh_destructor for %06x " IPOIB_GID_FMT "\n",
751 be32_to_cpup((__be32 *) n->ha),
752 IPOIB_GID_ARG(*((union ib_gid *) (n->ha + 4))));
753
754 spin_lock_irqsave(&priv->lock, flags);
755
756 neigh = *to_ipoib_neigh(n);
757 if (neigh) {
758 if (neigh->ah)
759 ah = neigh->ah;
760 list_del(&neigh->list);
761 *to_ipoib_neigh(n) = NULL;
762 kfree(neigh);
763 }
764
765 spin_unlock_irqrestore(&priv->lock, flags);
766
767 if (ah)
768 ipoib_put_ah(ah);
769 }
770
771 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
772 {
773 parms->neigh_destructor = ipoib_neigh_destructor;
774
775 return 0;
776 }
777
778 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
779 {
780 struct ipoib_dev_priv *priv = netdev_priv(dev);
781
782 /* Allocate RX/TX "rings" to hold queued skbs */
783
784 priv->rx_ring = kzalloc(IPOIB_RX_RING_SIZE * sizeof (struct ipoib_rx_buf),
785 GFP_KERNEL);
786 if (!priv->rx_ring) {
787 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
788 ca->name, IPOIB_RX_RING_SIZE);
789 goto out;
790 }
791
792 priv->tx_ring = kzalloc(IPOIB_TX_RING_SIZE * sizeof (struct ipoib_tx_buf),
793 GFP_KERNEL);
794 if (!priv->tx_ring) {
795 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
796 ca->name, IPOIB_TX_RING_SIZE);
797 goto out_rx_ring_cleanup;
798 }
799
800 /* priv->tx_head & tx_tail are already 0 */
801
802 if (ipoib_ib_dev_init(dev, ca, port))
803 goto out_tx_ring_cleanup;
804
805 return 0;
806
807 out_tx_ring_cleanup:
808 kfree(priv->tx_ring);
809
810 out_rx_ring_cleanup:
811 kfree(priv->rx_ring);
812
813 out:
814 return -ENOMEM;
815 }
816
817 void ipoib_dev_cleanup(struct net_device *dev)
818 {
819 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
820
821 ipoib_delete_debug_files(dev);
822
823 /* Delete any child interfaces first */
824 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
825 unregister_netdev(cpriv->dev);
826 ipoib_dev_cleanup(cpriv->dev);
827 free_netdev(cpriv->dev);
828 }
829
830 ipoib_ib_dev_cleanup(dev);
831
832 kfree(priv->rx_ring);
833 kfree(priv->tx_ring);
834
835 priv->rx_ring = NULL;
836 priv->tx_ring = NULL;
837 }
838
839 static void ipoib_setup(struct net_device *dev)
840 {
841 struct ipoib_dev_priv *priv = netdev_priv(dev);
842
843 dev->open = ipoib_open;
844 dev->stop = ipoib_stop;
845 dev->change_mtu = ipoib_change_mtu;
846 dev->hard_start_xmit = ipoib_start_xmit;
847 dev->get_stats = ipoib_get_stats;
848 dev->tx_timeout = ipoib_timeout;
849 dev->hard_header = ipoib_hard_header;
850 dev->set_multicast_list = ipoib_set_mcast_list;
851 dev->neigh_setup = ipoib_neigh_setup_dev;
852
853 dev->watchdog_timeo = HZ;
854
855 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
856
857 /*
858 * We add in INFINIBAND_ALEN to allow for the destination
859 * address "pseudoheader" for skbs without neighbour struct.
860 */
861 dev->hard_header_len = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
862 dev->addr_len = INFINIBAND_ALEN;
863 dev->type = ARPHRD_INFINIBAND;
864 dev->tx_queue_len = IPOIB_TX_RING_SIZE * 2;
865 dev->features = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
866
867 /* MTU will be reset when mcast join happens */
868 dev->mtu = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
869 priv->mcast_mtu = priv->admin_mtu = dev->mtu;
870
871 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
872
873 netif_carrier_off(dev);
874
875 SET_MODULE_OWNER(dev);
876
877 priv->dev = dev;
878
879 spin_lock_init(&priv->lock);
880 spin_lock_init(&priv->tx_lock);
881
882 mutex_init(&priv->mcast_mutex);
883 mutex_init(&priv->vlan_mutex);
884
885 INIT_LIST_HEAD(&priv->path_list);
886 INIT_LIST_HEAD(&priv->child_intfs);
887 INIT_LIST_HEAD(&priv->dead_ahs);
888 INIT_LIST_HEAD(&priv->multicast_list);
889
890 INIT_WORK(&priv->pkey_task, ipoib_pkey_poll, priv->dev);
891 INIT_WORK(&priv->mcast_task, ipoib_mcast_join_task, priv->dev);
892 INIT_WORK(&priv->flush_task, ipoib_ib_dev_flush, priv->dev);
893 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task, priv->dev);
894 INIT_WORK(&priv->ah_reap_task, ipoib_reap_ah, priv->dev);
895 }
896
897 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
898 {
899 struct net_device *dev;
900
901 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
902 ipoib_setup);
903 if (!dev)
904 return NULL;
905
906 return netdev_priv(dev);
907 }
908
909 static ssize_t show_pkey(struct class_device *cdev, char *buf)
910 {
911 struct ipoib_dev_priv *priv =
912 netdev_priv(container_of(cdev, struct net_device, class_dev));
913
914 return sprintf(buf, "0x%04x\n", priv->pkey);
915 }
916 static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
917
918 static ssize_t create_child(struct class_device *cdev,
919 const char *buf, size_t count)
920 {
921 int pkey;
922 int ret;
923
924 if (sscanf(buf, "%i", &pkey) != 1)
925 return -EINVAL;
926
927 if (pkey < 0 || pkey > 0xffff)
928 return -EINVAL;
929
930 /*
931 * Set the full membership bit, so that we join the right
932 * broadcast group, etc.
933 */
934 pkey |= 0x8000;
935
936 ret = ipoib_vlan_add(container_of(cdev, struct net_device, class_dev),
937 pkey);
938
939 return ret ? ret : count;
940 }
941 static CLASS_DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
942
943 static ssize_t delete_child(struct class_device *cdev,
944 const char *buf, size_t count)
945 {
946 int pkey;
947 int ret;
948
949 if (sscanf(buf, "%i", &pkey) != 1)
950 return -EINVAL;
951
952 if (pkey < 0 || pkey > 0xffff)
953 return -EINVAL;
954
955 ret = ipoib_vlan_delete(container_of(cdev, struct net_device, class_dev),
956 pkey);
957
958 return ret ? ret : count;
959
960 }
961 static CLASS_DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
962
963 int ipoib_add_pkey_attr(struct net_device *dev)
964 {
965 return class_device_create_file(&dev->class_dev,
966 &class_device_attr_pkey);
967 }
968
969 static struct net_device *ipoib_add_port(const char *format,
970 struct ib_device *hca, u8 port)
971 {
972 struct ipoib_dev_priv *priv;
973 int result = -ENOMEM;
974
975 priv = ipoib_intf_alloc(format);
976 if (!priv)
977 goto alloc_mem_failed;
978
979 SET_NETDEV_DEV(priv->dev, hca->dma_device);
980
981 result = ib_query_pkey(hca, port, 0, &priv->pkey);
982 if (result) {
983 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
984 hca->name, port, result);
985 goto alloc_mem_failed;
986 }
987
988 /*
989 * Set the full membership bit, so that we join the right
990 * broadcast group, etc.
991 */
992 priv->pkey |= 0x8000;
993
994 priv->dev->broadcast[8] = priv->pkey >> 8;
995 priv->dev->broadcast[9] = priv->pkey & 0xff;
996
997 result = ib_query_gid(hca, port, 0, &priv->local_gid);
998 if (result) {
999 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1000 hca->name, port, result);
1001 goto alloc_mem_failed;
1002 } else
1003 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1004
1005
1006 result = ipoib_dev_init(priv->dev, hca, port);
1007 if (result < 0) {
1008 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1009 hca->name, port, result);
1010 goto device_init_failed;
1011 }
1012
1013 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1014 priv->ca, ipoib_event);
1015 result = ib_register_event_handler(&priv->event_handler);
1016 if (result < 0) {
1017 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1018 "port %d (ret = %d)\n",
1019 hca->name, port, result);
1020 goto event_failed;
1021 }
1022
1023 result = register_netdev(priv->dev);
1024 if (result) {
1025 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1026 hca->name, port, result);
1027 goto register_failed;
1028 }
1029
1030 ipoib_create_debug_files(priv->dev);
1031
1032 if (ipoib_add_pkey_attr(priv->dev))
1033 goto sysfs_failed;
1034 if (class_device_create_file(&priv->dev->class_dev,
1035 &class_device_attr_create_child))
1036 goto sysfs_failed;
1037 if (class_device_create_file(&priv->dev->class_dev,
1038 &class_device_attr_delete_child))
1039 goto sysfs_failed;
1040
1041 return priv->dev;
1042
1043 sysfs_failed:
1044 ipoib_delete_debug_files(priv->dev);
1045 unregister_netdev(priv->dev);
1046
1047 register_failed:
1048 ib_unregister_event_handler(&priv->event_handler);
1049 flush_scheduled_work();
1050
1051 event_failed:
1052 ipoib_dev_cleanup(priv->dev);
1053
1054 device_init_failed:
1055 free_netdev(priv->dev);
1056
1057 alloc_mem_failed:
1058 return ERR_PTR(result);
1059 }
1060
1061 static void ipoib_add_one(struct ib_device *device)
1062 {
1063 struct list_head *dev_list;
1064 struct net_device *dev;
1065 struct ipoib_dev_priv *priv;
1066 int s, e, p;
1067
1068 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1069 if (!dev_list)
1070 return;
1071
1072 INIT_LIST_HEAD(dev_list);
1073
1074 if (device->node_type == IB_NODE_SWITCH) {
1075 s = 0;
1076 e = 0;
1077 } else {
1078 s = 1;
1079 e = device->phys_port_cnt;
1080 }
1081
1082 for (p = s; p <= e; ++p) {
1083 dev = ipoib_add_port("ib%d", device, p);
1084 if (!IS_ERR(dev)) {
1085 priv = netdev_priv(dev);
1086 list_add_tail(&priv->list, dev_list);
1087 }
1088 }
1089
1090 ib_set_client_data(device, &ipoib_client, dev_list);
1091 }
1092
1093 static void ipoib_remove_one(struct ib_device *device)
1094 {
1095 struct ipoib_dev_priv *priv, *tmp;
1096 struct list_head *dev_list;
1097
1098 dev_list = ib_get_client_data(device, &ipoib_client);
1099
1100 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1101 ib_unregister_event_handler(&priv->event_handler);
1102 flush_scheduled_work();
1103
1104 unregister_netdev(priv->dev);
1105 ipoib_dev_cleanup(priv->dev);
1106 free_netdev(priv->dev);
1107 }
1108
1109 kfree(dev_list);
1110 }
1111
1112 static int __init ipoib_init_module(void)
1113 {
1114 int ret;
1115
1116 ret = ipoib_register_debugfs();
1117 if (ret)
1118 return ret;
1119
1120 /*
1121 * We create our own workqueue mainly because we want to be
1122 * able to flush it when devices are being removed. We can't
1123 * use schedule_work()/flush_scheduled_work() because both
1124 * unregister_netdev() and linkwatch_event take the rtnl lock,
1125 * so flush_scheduled_work() can deadlock during device
1126 * removal.
1127 */
1128 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1129 if (!ipoib_workqueue) {
1130 ret = -ENOMEM;
1131 goto err_fs;
1132 }
1133
1134 ret = ib_register_client(&ipoib_client);
1135 if (ret)
1136 goto err_wq;
1137
1138 return 0;
1139
1140 err_wq:
1141 destroy_workqueue(ipoib_workqueue);
1142
1143 err_fs:
1144 ipoib_unregister_debugfs();
1145
1146 return ret;
1147 }
1148
1149 static void __exit ipoib_cleanup_module(void)
1150 {
1151 ib_unregister_client(&ipoib_client);
1152 ipoib_unregister_debugfs();
1153 destroy_workqueue(ipoib_workqueue);
1154 }
1155
1156 module_init(ipoib_init_module);
1157 module_exit(ipoib_cleanup_module);
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