?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 2.6.21
[linux/fpc-iii.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
blobf2a40ae8e7d0c8af562f03ad7254b62d5db1caf0
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/kernel.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 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
57 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
58
59 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
60 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
61 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
62 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
63
64 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
65 int ipoib_debug_level;
66
67 module_param_named(debug_level, ipoib_debug_level, int, 0644);
68 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
69 #endif
70
71 struct ipoib_path_iter {
72 struct net_device *dev;
73 struct ipoib_path path;
74 };
75
76 static const u8 ipv4_bcast_addr[] = {
77 0x00, 0xff, 0xff, 0xff,
78 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
79 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
80 };
81
82 struct workqueue_struct *ipoib_workqueue;
83
84 struct ib_sa_client ipoib_sa_client;
85
86 static void ipoib_add_one(struct ib_device *device);
87 static void ipoib_remove_one(struct ib_device *device);
88
89 static struct ib_client ipoib_client = {
90 .name = "ipoib",
91 .add = ipoib_add_one,
92 .remove = ipoib_remove_one
93 };
94
95 int ipoib_open(struct net_device *dev)
96 {
97 struct ipoib_dev_priv *priv = netdev_priv(dev);
98
99 ipoib_dbg(priv, "bringing up interface\n");
100
101 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
102
103 if (ipoib_pkey_dev_delay_open(dev))
104 return 0;
105
106 if (ipoib_ib_dev_open(dev))
107 return -EINVAL;
108
109 if (ipoib_ib_dev_up(dev)) {
110 ipoib_ib_dev_stop(dev);
111 return -EINVAL;
112 }
113
114 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
115 struct ipoib_dev_priv *cpriv;
116
117 /* Bring up any child interfaces too */
118 mutex_lock(&priv->vlan_mutex);
119 list_for_each_entry(cpriv, &priv->child_intfs, list) {
120 int flags;
121
122 flags = cpriv->dev->flags;
123 if (flags & IFF_UP)
124 continue;
125
126 dev_change_flags(cpriv->dev, flags | IFF_UP);
127 }
128 mutex_unlock(&priv->vlan_mutex);
129 }
130
131 netif_start_queue(dev);
132
133 return 0;
134 }
135
136 static int ipoib_stop(struct net_device *dev)
137 {
138 struct ipoib_dev_priv *priv = netdev_priv(dev);
139
140 ipoib_dbg(priv, "stopping interface\n");
141
142 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
143
144 netif_stop_queue(dev);
145
146 clear_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags);
147
148 /*
149 * Now flush workqueue to make sure a scheduled task doesn't
150 * bring our internal state back up.
151 */
152 flush_workqueue(ipoib_workqueue);
153
154 ipoib_ib_dev_down(dev, 1);
155 ipoib_ib_dev_stop(dev);
156
157 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
158 struct ipoib_dev_priv *cpriv;
159
160 /* Bring down any child interfaces too */
161 mutex_lock(&priv->vlan_mutex);
162 list_for_each_entry(cpriv, &priv->child_intfs, list) {
163 int flags;
164
165 flags = cpriv->dev->flags;
166 if (!(flags & IFF_UP))
167 continue;
168
169 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
170 }
171 mutex_unlock(&priv->vlan_mutex);
172 }
173
174 return 0;
175 }
176
177 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
178 {
179 struct ipoib_dev_priv *priv = netdev_priv(dev);
180
181 /* dev->mtu > 2K ==> connected mode */
182 if (ipoib_cm_admin_enabled(dev) && new_mtu <= IPOIB_CM_MTU) {
183 if (new_mtu > priv->mcast_mtu)
184 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
185 priv->mcast_mtu);
186 dev->mtu = new_mtu;
187 return 0;
188 }
189
190 if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN) {
191 return -EINVAL;
192 }
193
194 priv->admin_mtu = new_mtu;
195
196 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
197
198 return 0;
199 }
200
201 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
202 {
203 struct ipoib_dev_priv *priv = netdev_priv(dev);
204 struct rb_node *n = priv->path_tree.rb_node;
205 struct ipoib_path *path;
206 int ret;
207
208 while (n) {
209 path = rb_entry(n, struct ipoib_path, rb_node);
210
211 ret = memcmp(gid, path->pathrec.dgid.raw,
212 sizeof (union ib_gid));
213
214 if (ret < 0)
215 n = n->rb_left;
216 else if (ret > 0)
217 n = n->rb_right;
218 else
219 return path;
220 }
221
222 return NULL;
223 }
224
225 static int __path_add(struct net_device *dev, struct ipoib_path *path)
226 {
227 struct ipoib_dev_priv *priv = netdev_priv(dev);
228 struct rb_node **n = &priv->path_tree.rb_node;
229 struct rb_node *pn = NULL;
230 struct ipoib_path *tpath;
231 int ret;
232
233 while (*n) {
234 pn = *n;
235 tpath = rb_entry(pn, struct ipoib_path, rb_node);
236
237 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
238 sizeof (union ib_gid));
239 if (ret < 0)
240 n = &pn->rb_left;
241 else if (ret > 0)
242 n = &pn->rb_right;
243 else
244 return -EEXIST;
245 }
246
247 rb_link_node(&path->rb_node, pn, n);
248 rb_insert_color(&path->rb_node, &priv->path_tree);
249
250 list_add_tail(&path->list, &priv->path_list);
251
252 return 0;
253 }
254
255 static void path_free(struct net_device *dev, struct ipoib_path *path)
256 {
257 struct ipoib_dev_priv *priv = netdev_priv(dev);
258 struct ipoib_neigh *neigh, *tn;
259 struct sk_buff *skb;
260 unsigned long flags;
261
262 while ((skb = __skb_dequeue(&path->queue)))
263 dev_kfree_skb_irq(skb);
264
265 spin_lock_irqsave(&priv->lock, flags);
266
267 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
268 /*
269 * It's safe to call ipoib_put_ah() inside priv->lock
270 * here, because we know that path->ah will always
271 * hold one more reference, so ipoib_put_ah() will
272 * never do more than decrement the ref count.
273 */
274 if (neigh->ah)
275 ipoib_put_ah(neigh->ah);
276
277 ipoib_neigh_free(dev, neigh);
278 }
279
280 spin_unlock_irqrestore(&priv->lock, flags);
281
282 if (path->ah)
283 ipoib_put_ah(path->ah);
284
285 kfree(path);
286 }
287
288 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
289
290 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
291 {
292 struct ipoib_path_iter *iter;
293
294 iter = kmalloc(sizeof *iter, GFP_KERNEL);
295 if (!iter)
296 return NULL;
297
298 iter->dev = dev;
299 memset(iter->path.pathrec.dgid.raw, 0, 16);
300
301 if (ipoib_path_iter_next(iter)) {
302 kfree(iter);
303 return NULL;
304 }
305
306 return iter;
307 }
308
309 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
310 {
311 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
312 struct rb_node *n;
313 struct ipoib_path *path;
314 int ret = 1;
315
316 spin_lock_irq(&priv->lock);
317
318 n = rb_first(&priv->path_tree);
319
320 while (n) {
321 path = rb_entry(n, struct ipoib_path, rb_node);
322
323 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
324 sizeof (union ib_gid)) < 0) {
325 iter->path = *path;
326 ret = 0;
327 break;
328 }
329
330 n = rb_next(n);
331 }
332
333 spin_unlock_irq(&priv->lock);
334
335 return ret;
336 }
337
338 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
339 struct ipoib_path *path)
340 {
341 *path = iter->path;
342 }
343
344 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
345
346 void ipoib_flush_paths(struct net_device *dev)
347 {
348 struct ipoib_dev_priv *priv = netdev_priv(dev);
349 struct ipoib_path *path, *tp;
350 LIST_HEAD(remove_list);
351
352 spin_lock_irq(&priv->tx_lock);
353 spin_lock(&priv->lock);
354
355 list_splice(&priv->path_list, &remove_list);
356 INIT_LIST_HEAD(&priv->path_list);
357
358 list_for_each_entry(path, &remove_list, list)
359 rb_erase(&path->rb_node, &priv->path_tree);
360
361 list_for_each_entry_safe(path, tp, &remove_list, list) {
362 if (path->query)
363 ib_sa_cancel_query(path->query_id, path->query);
364 spin_unlock(&priv->lock);
365 spin_unlock_irq(&priv->tx_lock);
366 wait_for_completion(&path->done);
367 path_free(dev, path);
368 spin_lock_irq(&priv->tx_lock);
369 spin_lock(&priv->lock);
370 }
371 spin_unlock(&priv->lock);
372 spin_unlock_irq(&priv->tx_lock);
373 }
374
375 static void path_rec_completion(int status,
376 struct ib_sa_path_rec *pathrec,
377 void *path_ptr)
378 {
379 struct ipoib_path *path = path_ptr;
380 struct net_device *dev = path->dev;
381 struct ipoib_dev_priv *priv = netdev_priv(dev);
382 struct ipoib_ah *ah = NULL;
383 struct ipoib_neigh *neigh, *tn;
384 struct sk_buff_head skqueue;
385 struct sk_buff *skb;
386 unsigned long flags;
387
388 if (!status)
389 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
390 be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
391 else
392 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
393 status, IPOIB_GID_ARG(path->pathrec.dgid));
394
395 skb_queue_head_init(&skqueue);
396
397 if (!status) {
398 struct ib_ah_attr av = {
399 .dlid = be16_to_cpu(pathrec->dlid),
400 .sl = pathrec->sl,
401 .port_num = priv->port,
402 .static_rate = pathrec->rate
403 };
404
405 ah = ipoib_create_ah(dev, priv->pd, &av);
406 }
407
408 spin_lock_irqsave(&priv->lock, flags);
409
410 path->ah = ah;
411
412 if (ah) {
413 path->pathrec = *pathrec;
414
415 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
416 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
417
418 while ((skb = __skb_dequeue(&path->queue)))
419 __skb_queue_tail(&skqueue, skb);
420
421 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
422 kref_get(&path->ah->ref);
423 neigh->ah = path->ah;
424 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
425 sizeof(union ib_gid));
426
427 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
428 if (!ipoib_cm_get(neigh))
429 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
430 path,
431 neigh));
432 if (!ipoib_cm_get(neigh)) {
433 list_del(&neigh->list);
434 if (neigh->ah)
435 ipoib_put_ah(neigh->ah);
436 ipoib_neigh_free(dev, neigh);
437 continue;
438 }
439 }
440
441 while ((skb = __skb_dequeue(&neigh->queue)))
442 __skb_queue_tail(&skqueue, skb);
443 }
444 }
445
446 path->query = NULL;
447 complete(&path->done);
448
449 spin_unlock_irqrestore(&priv->lock, flags);
450
451 while ((skb = __skb_dequeue(&skqueue))) {
452 skb->dev = dev;
453 if (dev_queue_xmit(skb))
454 ipoib_warn(priv, "dev_queue_xmit failed "
455 "to requeue packet\n");
456 }
457 }
458
459 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
460 {
461 struct ipoib_dev_priv *priv = netdev_priv(dev);
462 struct ipoib_path *path;
463
464 path = kzalloc(sizeof *path, GFP_ATOMIC);
465 if (!path)
466 return NULL;
467
468 path->dev = dev;
469
470 skb_queue_head_init(&path->queue);
471
472 INIT_LIST_HEAD(&path->neigh_list);
473
474 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
475 path->pathrec.sgid = priv->local_gid;
476 path->pathrec.pkey = cpu_to_be16(priv->pkey);
477 path->pathrec.numb_path = 1;
478
479 return path;
480 }
481
482 static int path_rec_start(struct net_device *dev,
483 struct ipoib_path *path)
484 {
485 struct ipoib_dev_priv *priv = netdev_priv(dev);
486
487 ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
488 IPOIB_GID_ARG(path->pathrec.dgid));
489
490 init_completion(&path->done);
491
492 path->query_id =
493 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
494 &path->pathrec,
495 IB_SA_PATH_REC_DGID |
496 IB_SA_PATH_REC_SGID |
497 IB_SA_PATH_REC_NUMB_PATH |
498 IB_SA_PATH_REC_PKEY,
499 1000, GFP_ATOMIC,
500 path_rec_completion,
501 path, &path->query);
502 if (path->query_id < 0) {
503 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
504 path->query = NULL;
505 return path->query_id;
506 }
507
508 return 0;
509 }
510
511 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
512 {
513 struct ipoib_dev_priv *priv = netdev_priv(dev);
514 struct ipoib_path *path;
515 struct ipoib_neigh *neigh;
516
517 neigh = ipoib_neigh_alloc(skb->dst->neighbour);
518 if (!neigh) {
519 ++priv->stats.tx_dropped;
520 dev_kfree_skb_any(skb);
521 return;
522 }
523
524 /*
525 * We can only be called from ipoib_start_xmit, so we're
526 * inside tx_lock -- no need to save/restore flags.
527 */
528 spin_lock(&priv->lock);
529
530 path = __path_find(dev, skb->dst->neighbour->ha + 4);
531 if (!path) {
532 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
533 if (!path)
534 goto err_path;
535
536 __path_add(dev, path);
537 }
538
539 list_add_tail(&neigh->list, &path->neigh_list);
540
541 if (path->ah) {
542 kref_get(&path->ah->ref);
543 neigh->ah = path->ah;
544 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
545 sizeof(union ib_gid));
546
547 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
548 if (!ipoib_cm_get(neigh))
549 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
550 if (!ipoib_cm_get(neigh)) {
551 list_del(&neigh->list);
552 if (neigh->ah)
553 ipoib_put_ah(neigh->ah);
554 ipoib_neigh_free(dev, neigh);
555 goto err_drop;
556 }
557 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
558 __skb_queue_tail(&neigh->queue, skb);
559 else {
560 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
561 skb_queue_len(&neigh->queue));
562 goto err_drop;
563 }
564 } else
565 ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
566 } else {
567 neigh->ah = NULL;
568
569 if (!path->query && path_rec_start(dev, path))
570 goto err_list;
571
572 __skb_queue_tail(&neigh->queue, skb);
573 }
574
575 spin_unlock(&priv->lock);
576 return;
577
578 err_list:
579 list_del(&neigh->list);
580
581 err_path:
582 ipoib_neigh_free(dev, neigh);
583 err_drop:
584 ++priv->stats.tx_dropped;
585 dev_kfree_skb_any(skb);
586
587 spin_unlock(&priv->lock);
588 }
589
590 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
591 {
592 struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
593
594 /* Look up path record for unicasts */
595 if (skb->dst->neighbour->ha[4] != 0xff) {
596 neigh_add_path(skb, dev);
597 return;
598 }
599
600 /* Add in the P_Key for multicasts */
601 skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
602 skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
603 ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
604 }
605
606 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
607 struct ipoib_pseudoheader *phdr)
608 {
609 struct ipoib_dev_priv *priv = netdev_priv(dev);
610 struct ipoib_path *path;
611
612 /*
613 * We can only be called from ipoib_start_xmit, so we're
614 * inside tx_lock -- no need to save/restore flags.
615 */
616 spin_lock(&priv->lock);
617
618 path = __path_find(dev, phdr->hwaddr + 4);
619 if (!path) {
620 path = path_rec_create(dev, phdr->hwaddr + 4);
621 if (path) {
622 /* put pseudoheader back on for next time */
623 skb_push(skb, sizeof *phdr);
624 __skb_queue_tail(&path->queue, skb);
625
626 if (path_rec_start(dev, path)) {
627 spin_unlock(&priv->lock);
628 path_free(dev, path);
629 return;
630 } else
631 __path_add(dev, path);
632 } else {
633 ++priv->stats.tx_dropped;
634 dev_kfree_skb_any(skb);
635 }
636
637 spin_unlock(&priv->lock);
638 return;
639 }
640
641 if (path->ah) {
642 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
643 be16_to_cpu(path->pathrec.dlid));
644
645 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
646 } else if ((path->query || !path_rec_start(dev, path)) &&
647 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
648 /* put pseudoheader back on for next time */
649 skb_push(skb, sizeof *phdr);
650 __skb_queue_tail(&path->queue, skb);
651 } else {
652 ++priv->stats.tx_dropped;
653 dev_kfree_skb_any(skb);
654 }
655
656 spin_unlock(&priv->lock);
657 }
658
659 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
660 {
661 struct ipoib_dev_priv *priv = netdev_priv(dev);
662 struct ipoib_neigh *neigh;
663 unsigned long flags;
664
665 if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
666 return NETDEV_TX_LOCKED;
667
668 /*
669 * Check if our queue is stopped. Since we have the LLTX bit
670 * set, we can't rely on netif_stop_queue() preventing our
671 * xmit function from being called with a full queue.
672 */
673 if (unlikely(netif_queue_stopped(dev))) {
674 spin_unlock_irqrestore(&priv->tx_lock, flags);
675 return NETDEV_TX_BUSY;
676 }
677
678 if (likely(skb->dst && skb->dst->neighbour)) {
679 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
680 ipoib_path_lookup(skb, dev);
681 goto out;
682 }
683
684 neigh = *to_ipoib_neigh(skb->dst->neighbour);
685
686 if (ipoib_cm_get(neigh)) {
687 if (ipoib_cm_up(neigh)) {
688 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
689 goto out;
690 }
691 } else if (neigh->ah) {
692 if (unlikely(memcmp(&neigh->dgid.raw,
693 skb->dst->neighbour->ha + 4,
694 sizeof(union ib_gid)))) {
695 spin_lock(&priv->lock);
696 /*
697 * It's safe to call ipoib_put_ah() inside
698 * priv->lock here, because we know that
699 * path->ah will always hold one more reference,
700 * so ipoib_put_ah() will never do more than
701 * decrement the ref count.
702 */
703 ipoib_put_ah(neigh->ah);
704 list_del(&neigh->list);
705 ipoib_neigh_free(dev, neigh);
706 spin_unlock(&priv->lock);
707 ipoib_path_lookup(skb, dev);
708 goto out;
709 }
710
711 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
712 goto out;
713 }
714
715 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
716 spin_lock(&priv->lock);
717 __skb_queue_tail(&neigh->queue, skb);
718 spin_unlock(&priv->lock);
719 } else {
720 ++priv->stats.tx_dropped;
721 dev_kfree_skb_any(skb);
722 }
723 } else {
724 struct ipoib_pseudoheader *phdr =
725 (struct ipoib_pseudoheader *) skb->data;
726 skb_pull(skb, sizeof *phdr);
727
728 if (phdr->hwaddr[4] == 0xff) {
729 /* Add in the P_Key for multicast*/
730 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
731 phdr->hwaddr[9] = priv->pkey & 0xff;
732
733 ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
734 } else {
735 /* unicast GID -- should be ARP or RARP reply */
736
737 if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
738 (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
739 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
740 IPOIB_GID_FMT "\n",
741 skb->dst ? "neigh" : "dst",
742 be16_to_cpup((__be16 *) skb->data),
743 IPOIB_QPN(phdr->hwaddr),
744 IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
745 dev_kfree_skb_any(skb);
746 ++priv->stats.tx_dropped;
747 goto out;
748 }
749
750 unicast_arp_send(skb, dev, phdr);
751 }
752 }
753
754 out:
755 spin_unlock_irqrestore(&priv->tx_lock, flags);
756
757 return NETDEV_TX_OK;
758 }
759
760 static struct net_device_stats *ipoib_get_stats(struct net_device *dev)
761 {
762 struct ipoib_dev_priv *priv = netdev_priv(dev);
763
764 return &priv->stats;
765 }
766
767 static void ipoib_timeout(struct net_device *dev)
768 {
769 struct ipoib_dev_priv *priv = netdev_priv(dev);
770
771 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
772 jiffies_to_msecs(jiffies - dev->trans_start));
773 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
774 netif_queue_stopped(dev),
775 priv->tx_head, priv->tx_tail);
776 /* XXX reset QP, etc. */
777 }
778
779 static int ipoib_hard_header(struct sk_buff *skb,
780 struct net_device *dev,
781 unsigned short type,
782 void *daddr, void *saddr, unsigned len)
783 {
784 struct ipoib_header *header;
785
786 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
787
788 header->proto = htons(type);
789 header->reserved = 0;
790
791 /*
792 * If we don't have a neighbour structure, stuff the
793 * destination address onto the front of the skb so we can
794 * figure out where to send the packet later.
795 */
796 if ((!skb->dst || !skb->dst->neighbour) && daddr) {
797 struct ipoib_pseudoheader *phdr =
798 (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
799 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
800 }
801
802 return 0;
803 }
804
805 static void ipoib_set_mcast_list(struct net_device *dev)
806 {
807 struct ipoib_dev_priv *priv = netdev_priv(dev);
808
809 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
810 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
811 return;
812 }
813
814 queue_work(ipoib_workqueue, &priv->restart_task);
815 }
816
817 static void ipoib_neigh_cleanup(struct neighbour *n)
818 {
819 struct ipoib_neigh *neigh;
820 struct ipoib_dev_priv *priv = netdev_priv(n->dev);
821 unsigned long flags;
822 struct ipoib_ah *ah = NULL;
823
824 ipoib_dbg(priv,
825 "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
826 IPOIB_QPN(n->ha),
827 IPOIB_GID_RAW_ARG(n->ha + 4));
828
829 spin_lock_irqsave(&priv->lock, flags);
830
831 neigh = *to_ipoib_neigh(n);
832 if (neigh) {
833 if (neigh->ah)
834 ah = neigh->ah;
835 list_del(&neigh->list);
836 ipoib_neigh_free(n->dev, neigh);
837 }
838
839 spin_unlock_irqrestore(&priv->lock, flags);
840
841 if (ah)
842 ipoib_put_ah(ah);
843 }
844
845 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
846 {
847 struct ipoib_neigh *neigh;
848
849 neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
850 if (!neigh)
851 return NULL;
852
853 neigh->neighbour = neighbour;
854 *to_ipoib_neigh(neighbour) = neigh;
855 skb_queue_head_init(&neigh->queue);
856 ipoib_cm_set(neigh, NULL);
857
858 return neigh;
859 }
860
861 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
862 {
863 struct ipoib_dev_priv *priv = netdev_priv(dev);
864 struct sk_buff *skb;
865 *to_ipoib_neigh(neigh->neighbour) = NULL;
866 while ((skb = __skb_dequeue(&neigh->queue))) {
867 ++priv->stats.tx_dropped;
868 dev_kfree_skb_any(skb);
869 }
870 if (ipoib_cm_get(neigh))
871 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
872 kfree(neigh);
873 }
874
875 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
876 {
877 parms->neigh_cleanup = ipoib_neigh_cleanup;
878
879 return 0;
880 }
881
882 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
883 {
884 struct ipoib_dev_priv *priv = netdev_priv(dev);
885
886 /* Allocate RX/TX "rings" to hold queued skbs */
887 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
888 GFP_KERNEL);
889 if (!priv->rx_ring) {
890 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
891 ca->name, ipoib_recvq_size);
892 goto out;
893 }
894
895 priv->tx_ring = kzalloc(ipoib_sendq_size * sizeof *priv->tx_ring,
896 GFP_KERNEL);
897 if (!priv->tx_ring) {
898 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
899 ca->name, ipoib_sendq_size);
900 goto out_rx_ring_cleanup;
901 }
902
903 /* priv->tx_head & tx_tail are already 0 */
904
905 if (ipoib_ib_dev_init(dev, ca, port))
906 goto out_tx_ring_cleanup;
907
908 return 0;
909
910 out_tx_ring_cleanup:
911 kfree(priv->tx_ring);
912
913 out_rx_ring_cleanup:
914 kfree(priv->rx_ring);
915
916 out:
917 return -ENOMEM;
918 }
919
920 void ipoib_dev_cleanup(struct net_device *dev)
921 {
922 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
923
924 ipoib_delete_debug_files(dev);
925
926 /* Delete any child interfaces first */
927 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
928 unregister_netdev(cpriv->dev);
929 ipoib_dev_cleanup(cpriv->dev);
930 free_netdev(cpriv->dev);
931 }
932
933 ipoib_ib_dev_cleanup(dev);
934
935 kfree(priv->rx_ring);
936 kfree(priv->tx_ring);
937
938 priv->rx_ring = NULL;
939 priv->tx_ring = NULL;
940 }
941
942 static void ipoib_setup(struct net_device *dev)
943 {
944 struct ipoib_dev_priv *priv = netdev_priv(dev);
945
946 dev->open = ipoib_open;
947 dev->stop = ipoib_stop;
948 dev->change_mtu = ipoib_change_mtu;
949 dev->hard_start_xmit = ipoib_start_xmit;
950 dev->get_stats = ipoib_get_stats;
951 dev->tx_timeout = ipoib_timeout;
952 dev->hard_header = ipoib_hard_header;
953 dev->set_multicast_list = ipoib_set_mcast_list;
954 dev->neigh_setup = ipoib_neigh_setup_dev;
955
956 dev->watchdog_timeo = HZ;
957
958 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
959
960 /*
961 * We add in INFINIBAND_ALEN to allow for the destination
962 * address "pseudoheader" for skbs without neighbour struct.
963 */
964 dev->hard_header_len = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
965 dev->addr_len = INFINIBAND_ALEN;
966 dev->type = ARPHRD_INFINIBAND;
967 dev->tx_queue_len = ipoib_sendq_size * 2;
968 dev->features = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
969
970 /* MTU will be reset when mcast join happens */
971 dev->mtu = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
972 priv->mcast_mtu = priv->admin_mtu = dev->mtu;
973
974 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
975
976 netif_carrier_off(dev);
977
978 SET_MODULE_OWNER(dev);
979
980 priv->dev = dev;
981
982 spin_lock_init(&priv->lock);
983 spin_lock_init(&priv->tx_lock);
984
985 mutex_init(&priv->mcast_mutex);
986 mutex_init(&priv->vlan_mutex);
987
988 INIT_LIST_HEAD(&priv->path_list);
989 INIT_LIST_HEAD(&priv->child_intfs);
990 INIT_LIST_HEAD(&priv->dead_ahs);
991 INIT_LIST_HEAD(&priv->multicast_list);
992
993 INIT_DELAYED_WORK(&priv->pkey_task, ipoib_pkey_poll);
994 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
995 INIT_WORK(&priv->flush_task, ipoib_ib_dev_flush);
996 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
997 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
998 }
999
1000 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1001 {
1002 struct net_device *dev;
1003
1004 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1005 ipoib_setup);
1006 if (!dev)
1007 return NULL;
1008
1009 return netdev_priv(dev);
1010 }
1011
1012 static ssize_t show_pkey(struct device *dev,
1013 struct device_attribute *attr, char *buf)
1014 {
1015 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1016
1017 return sprintf(buf, "0x%04x\n", priv->pkey);
1018 }
1019 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1020
1021 static ssize_t create_child(struct device *dev,
1022 struct device_attribute *attr,
1023 const char *buf, size_t count)
1024 {
1025 int pkey;
1026 int ret;
1027
1028 if (sscanf(buf, "%i", &pkey) != 1)
1029 return -EINVAL;
1030
1031 if (pkey < 0 || pkey > 0xffff)
1032 return -EINVAL;
1033
1034 /*
1035 * Set the full membership bit, so that we join the right
1036 * broadcast group, etc.
1037 */
1038 pkey |= 0x8000;
1039
1040 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1041
1042 return ret ? ret : count;
1043 }
1044 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1045
1046 static ssize_t delete_child(struct device *dev,
1047 struct device_attribute *attr,
1048 const char *buf, size_t count)
1049 {
1050 int pkey;
1051 int ret;
1052
1053 if (sscanf(buf, "%i", &pkey) != 1)
1054 return -EINVAL;
1055
1056 if (pkey < 0 || pkey > 0xffff)
1057 return -EINVAL;
1058
1059 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1060
1061 return ret ? ret : count;
1062
1063 }
1064 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1065
1066 int ipoib_add_pkey_attr(struct net_device *dev)
1067 {
1068 return device_create_file(&dev->dev, &dev_attr_pkey);
1069 }
1070
1071 static struct net_device *ipoib_add_port(const char *format,
1072 struct ib_device *hca, u8 port)
1073 {
1074 struct ipoib_dev_priv *priv;
1075 int result = -ENOMEM;
1076
1077 priv = ipoib_intf_alloc(format);
1078 if (!priv)
1079 goto alloc_mem_failed;
1080
1081 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1082
1083 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1084 if (result) {
1085 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1086 hca->name, port, result);
1087 goto alloc_mem_failed;
1088 }
1089
1090 /*
1091 * Set the full membership bit, so that we join the right
1092 * broadcast group, etc.
1093 */
1094 priv->pkey |= 0x8000;
1095
1096 priv->dev->broadcast[8] = priv->pkey >> 8;
1097 priv->dev->broadcast[9] = priv->pkey & 0xff;
1098
1099 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1100 if (result) {
1101 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1102 hca->name, port, result);
1103 goto alloc_mem_failed;
1104 } else
1105 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1106
1107
1108 result = ipoib_dev_init(priv->dev, hca, port);
1109 if (result < 0) {
1110 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1111 hca->name, port, result);
1112 goto device_init_failed;
1113 }
1114
1115 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1116 priv->ca, ipoib_event);
1117 result = ib_register_event_handler(&priv->event_handler);
1118 if (result < 0) {
1119 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1120 "port %d (ret = %d)\n",
1121 hca->name, port, result);
1122 goto event_failed;
1123 }
1124
1125 result = register_netdev(priv->dev);
1126 if (result) {
1127 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1128 hca->name, port, result);
1129 goto register_failed;
1130 }
1131
1132 ipoib_create_debug_files(priv->dev);
1133
1134 if (ipoib_cm_add_mode_attr(priv->dev))
1135 goto sysfs_failed;
1136 if (ipoib_add_pkey_attr(priv->dev))
1137 goto sysfs_failed;
1138 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1139 goto sysfs_failed;
1140 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1141 goto sysfs_failed;
1142
1143 return priv->dev;
1144
1145 sysfs_failed:
1146 ipoib_delete_debug_files(priv->dev);
1147 unregister_netdev(priv->dev);
1148
1149 register_failed:
1150 ib_unregister_event_handler(&priv->event_handler);
1151 flush_scheduled_work();
1152
1153 event_failed:
1154 ipoib_dev_cleanup(priv->dev);
1155
1156 device_init_failed:
1157 free_netdev(priv->dev);
1158
1159 alloc_mem_failed:
1160 return ERR_PTR(result);
1161 }
1162
1163 static void ipoib_add_one(struct ib_device *device)
1164 {
1165 struct list_head *dev_list;
1166 struct net_device *dev;
1167 struct ipoib_dev_priv *priv;
1168 int s, e, p;
1169
1170 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1171 return;
1172
1173 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1174 if (!dev_list)
1175 return;
1176
1177 INIT_LIST_HEAD(dev_list);
1178
1179 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1180 s = 0;
1181 e = 0;
1182 } else {
1183 s = 1;
1184 e = device->phys_port_cnt;
1185 }
1186
1187 for (p = s; p <= e; ++p) {
1188 dev = ipoib_add_port("ib%d", device, p);
1189 if (!IS_ERR(dev)) {
1190 priv = netdev_priv(dev);
1191 list_add_tail(&priv->list, dev_list);
1192 }
1193 }
1194
1195 ib_set_client_data(device, &ipoib_client, dev_list);
1196 }
1197
1198 static void ipoib_remove_one(struct ib_device *device)
1199 {
1200 struct ipoib_dev_priv *priv, *tmp;
1201 struct list_head *dev_list;
1202
1203 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1204 return;
1205
1206 dev_list = ib_get_client_data(device, &ipoib_client);
1207
1208 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1209 ib_unregister_event_handler(&priv->event_handler);
1210 flush_scheduled_work();
1211
1212 unregister_netdev(priv->dev);
1213 ipoib_dev_cleanup(priv->dev);
1214 free_netdev(priv->dev);
1215 }
1216
1217 kfree(dev_list);
1218 }
1219
1220 static int __init ipoib_init_module(void)
1221 {
1222 int ret;
1223
1224 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1225 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1226 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1227
1228 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1229 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1230 ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1231
1232 ret = ipoib_register_debugfs();
1233 if (ret)
1234 return ret;
1235
1236 /*
1237 * We create our own workqueue mainly because we want to be
1238 * able to flush it when devices are being removed. We can't
1239 * use schedule_work()/flush_scheduled_work() because both
1240 * unregister_netdev() and linkwatch_event take the rtnl lock,
1241 * so flush_scheduled_work() can deadlock during device
1242 * removal.
1243 */
1244 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1245 if (!ipoib_workqueue) {
1246 ret = -ENOMEM;
1247 goto err_fs;
1248 }
1249
1250 ib_sa_register_client(&ipoib_sa_client);
1251
1252 ret = ib_register_client(&ipoib_client);
1253 if (ret)
1254 goto err_sa;
1255
1256 return 0;
1257
1258 err_sa:
1259 ib_sa_unregister_client(&ipoib_sa_client);
1260 destroy_workqueue(ipoib_workqueue);
1261
1262 err_fs:
1263 ipoib_unregister_debugfs();
1264
1265 return ret;
1266 }
1267
1268 static void __exit ipoib_cleanup_module(void)
1269 {
1270 ib_unregister_client(&ipoib_client);
1271 ib_sa_unregister_client(&ipoib_sa_client);
1272 ipoib_unregister_debugfs();
1273 destroy_workqueue(ipoib_workqueue);
1274 }
1275
1276 module_init(ipoib_init_module);
1277 module_exit(ipoib_cleanup_module);
Linux with added FPC-III support