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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
blob57282048865c1c66c9df6a061fefb3cfba07defb
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 #include <linux/vmalloc.h>
45
46 #include <linux/if_arp.h> /* For ARPHRD_xxx */
47
48 #include <linux/ip.h>
49 #include <linux/in.h>
50
51 #include <net/dst.h>
52
53 MODULE_AUTHOR("Roland Dreier");
54 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
55 MODULE_LICENSE("Dual BSD/GPL");
56
57 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
58 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
59
60 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
61 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
62 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
63 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
64
65 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
66 int ipoib_debug_level;
67
68 module_param_named(debug_level, ipoib_debug_level, int, 0644);
69 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
70 #endif
71
72 struct ipoib_path_iter {
73 struct net_device *dev;
74 struct ipoib_path path;
75 };
76
77 static const u8 ipv4_bcast_addr[] = {
78 0x00, 0xff, 0xff, 0xff,
79 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
80 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
81 };
82
83 struct workqueue_struct *ipoib_workqueue;
84
85 struct ib_sa_client ipoib_sa_client;
86
87 static void ipoib_add_one(struct ib_device *device);
88 static void ipoib_remove_one(struct ib_device *device);
89
90 static struct ib_client ipoib_client = {
91 .name = "ipoib",
92 .add = ipoib_add_one,
93 .remove = ipoib_remove_one
94 };
95
96 int ipoib_open(struct net_device *dev)
97 {
98 struct ipoib_dev_priv *priv = netdev_priv(dev);
99
100 ipoib_dbg(priv, "bringing up interface\n");
101
102 napi_enable(&priv->napi);
103 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
104
105 if (ipoib_pkey_dev_delay_open(dev))
106 return 0;
107
108 if (ipoib_ib_dev_open(dev)) {
109 napi_disable(&priv->napi);
110 return -EINVAL;
111 }
112
113 if (ipoib_ib_dev_up(dev)) {
114 ipoib_ib_dev_stop(dev, 1);
115 napi_disable(&priv->napi);
116 return -EINVAL;
117 }
118
119 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
120 struct ipoib_dev_priv *cpriv;
121
122 /* Bring up any child interfaces too */
123 mutex_lock(&priv->vlan_mutex);
124 list_for_each_entry(cpriv, &priv->child_intfs, list) {
125 int flags;
126
127 flags = cpriv->dev->flags;
128 if (flags & IFF_UP)
129 continue;
130
131 dev_change_flags(cpriv->dev, flags | IFF_UP);
132 }
133 mutex_unlock(&priv->vlan_mutex);
134 }
135
136 netif_start_queue(dev);
137
138 return 0;
139 }
140
141 static int ipoib_stop(struct net_device *dev)
142 {
143 struct ipoib_dev_priv *priv = netdev_priv(dev);
144
145 ipoib_dbg(priv, "stopping interface\n");
146
147 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
148 napi_disable(&priv->napi);
149
150 netif_stop_queue(dev);
151
152 /*
153 * Now flush workqueue to make sure a scheduled task doesn't
154 * bring our internal state back up.
155 */
156 flush_workqueue(ipoib_workqueue);
157
158 ipoib_ib_dev_down(dev, 1);
159 ipoib_ib_dev_stop(dev, 1);
160
161 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
162 struct ipoib_dev_priv *cpriv;
163
164 /* Bring down any child interfaces too */
165 mutex_lock(&priv->vlan_mutex);
166 list_for_each_entry(cpriv, &priv->child_intfs, list) {
167 int flags;
168
169 flags = cpriv->dev->flags;
170 if (!(flags & IFF_UP))
171 continue;
172
173 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
174 }
175 mutex_unlock(&priv->vlan_mutex);
176 }
177
178 return 0;
179 }
180
181 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
182 {
183 struct ipoib_dev_priv *priv = netdev_priv(dev);
184
185 /* dev->mtu > 2K ==> connected mode */
186 if (ipoib_cm_admin_enabled(dev)) {
187 if (new_mtu > ipoib_cm_max_mtu(dev))
188 return -EINVAL;
189
190 if (new_mtu > priv->mcast_mtu)
191 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
192 priv->mcast_mtu);
193
194 dev->mtu = new_mtu;
195 return 0;
196 }
197
198 if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN)
199 return -EINVAL;
200
201 priv->admin_mtu = new_mtu;
202
203 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
204
205 return 0;
206 }
207
208 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
209 {
210 struct ipoib_dev_priv *priv = netdev_priv(dev);
211 struct rb_node *n = priv->path_tree.rb_node;
212 struct ipoib_path *path;
213 int ret;
214
215 while (n) {
216 path = rb_entry(n, struct ipoib_path, rb_node);
217
218 ret = memcmp(gid, path->pathrec.dgid.raw,
219 sizeof (union ib_gid));
220
221 if (ret < 0)
222 n = n->rb_left;
223 else if (ret > 0)
224 n = n->rb_right;
225 else
226 return path;
227 }
228
229 return NULL;
230 }
231
232 static int __path_add(struct net_device *dev, struct ipoib_path *path)
233 {
234 struct ipoib_dev_priv *priv = netdev_priv(dev);
235 struct rb_node **n = &priv->path_tree.rb_node;
236 struct rb_node *pn = NULL;
237 struct ipoib_path *tpath;
238 int ret;
239
240 while (*n) {
241 pn = *n;
242 tpath = rb_entry(pn, struct ipoib_path, rb_node);
243
244 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
245 sizeof (union ib_gid));
246 if (ret < 0)
247 n = &pn->rb_left;
248 else if (ret > 0)
249 n = &pn->rb_right;
250 else
251 return -EEXIST;
252 }
253
254 rb_link_node(&path->rb_node, pn, n);
255 rb_insert_color(&path->rb_node, &priv->path_tree);
256
257 list_add_tail(&path->list, &priv->path_list);
258
259 return 0;
260 }
261
262 static void path_free(struct net_device *dev, struct ipoib_path *path)
263 {
264 struct ipoib_dev_priv *priv = netdev_priv(dev);
265 struct ipoib_neigh *neigh, *tn;
266 struct sk_buff *skb;
267 unsigned long flags;
268
269 while ((skb = __skb_dequeue(&path->queue)))
270 dev_kfree_skb_irq(skb);
271
272 spin_lock_irqsave(&priv->lock, flags);
273
274 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
275 /*
276 * It's safe to call ipoib_put_ah() inside priv->lock
277 * here, because we know that path->ah will always
278 * hold one more reference, so ipoib_put_ah() will
279 * never do more than decrement the ref count.
280 */
281 if (neigh->ah)
282 ipoib_put_ah(neigh->ah);
283
284 ipoib_neigh_free(dev, neigh);
285 }
286
287 spin_unlock_irqrestore(&priv->lock, flags);
288
289 if (path->ah)
290 ipoib_put_ah(path->ah);
291
292 kfree(path);
293 }
294
295 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
296
297 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
298 {
299 struct ipoib_path_iter *iter;
300
301 iter = kmalloc(sizeof *iter, GFP_KERNEL);
302 if (!iter)
303 return NULL;
304
305 iter->dev = dev;
306 memset(iter->path.pathrec.dgid.raw, 0, 16);
307
308 if (ipoib_path_iter_next(iter)) {
309 kfree(iter);
310 return NULL;
311 }
312
313 return iter;
314 }
315
316 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
317 {
318 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
319 struct rb_node *n;
320 struct ipoib_path *path;
321 int ret = 1;
322
323 spin_lock_irq(&priv->lock);
324
325 n = rb_first(&priv->path_tree);
326
327 while (n) {
328 path = rb_entry(n, struct ipoib_path, rb_node);
329
330 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
331 sizeof (union ib_gid)) < 0) {
332 iter->path = *path;
333 ret = 0;
334 break;
335 }
336
337 n = rb_next(n);
338 }
339
340 spin_unlock_irq(&priv->lock);
341
342 return ret;
343 }
344
345 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
346 struct ipoib_path *path)
347 {
348 *path = iter->path;
349 }
350
351 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
352
353 void ipoib_flush_paths(struct net_device *dev)
354 {
355 struct ipoib_dev_priv *priv = netdev_priv(dev);
356 struct ipoib_path *path, *tp;
357 LIST_HEAD(remove_list);
358
359 spin_lock_irq(&priv->tx_lock);
360 spin_lock(&priv->lock);
361
362 list_splice(&priv->path_list, &remove_list);
363 INIT_LIST_HEAD(&priv->path_list);
364
365 list_for_each_entry(path, &remove_list, list)
366 rb_erase(&path->rb_node, &priv->path_tree);
367
368 list_for_each_entry_safe(path, tp, &remove_list, list) {
369 if (path->query)
370 ib_sa_cancel_query(path->query_id, path->query);
371 spin_unlock(&priv->lock);
372 spin_unlock_irq(&priv->tx_lock);
373 wait_for_completion(&path->done);
374 path_free(dev, path);
375 spin_lock_irq(&priv->tx_lock);
376 spin_lock(&priv->lock);
377 }
378 spin_unlock(&priv->lock);
379 spin_unlock_irq(&priv->tx_lock);
380 }
381
382 static void path_rec_completion(int status,
383 struct ib_sa_path_rec *pathrec,
384 void *path_ptr)
385 {
386 struct ipoib_path *path = path_ptr;
387 struct net_device *dev = path->dev;
388 struct ipoib_dev_priv *priv = netdev_priv(dev);
389 struct ipoib_ah *ah = NULL;
390 struct ipoib_neigh *neigh, *tn;
391 struct sk_buff_head skqueue;
392 struct sk_buff *skb;
393 unsigned long flags;
394
395 if (!status)
396 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
397 be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
398 else
399 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
400 status, IPOIB_GID_ARG(path->pathrec.dgid));
401
402 skb_queue_head_init(&skqueue);
403
404 if (!status) {
405 struct ib_ah_attr av;
406
407 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
408 ah = ipoib_create_ah(dev, priv->pd, &av);
409 }
410
411 spin_lock_irqsave(&priv->lock, flags);
412
413 path->ah = ah;
414
415 if (ah) {
416 path->pathrec = *pathrec;
417
418 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
419 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
420
421 while ((skb = __skb_dequeue(&path->queue)))
422 __skb_queue_tail(&skqueue, skb);
423
424 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
425 kref_get(&path->ah->ref);
426 neigh->ah = path->ah;
427 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
428 sizeof(union ib_gid));
429
430 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
431 if (!ipoib_cm_get(neigh))
432 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
433 path,
434 neigh));
435 if (!ipoib_cm_get(neigh)) {
436 list_del(&neigh->list);
437 if (neigh->ah)
438 ipoib_put_ah(neigh->ah);
439 ipoib_neigh_free(dev, neigh);
440 continue;
441 }
442 }
443
444 while ((skb = __skb_dequeue(&neigh->queue)))
445 __skb_queue_tail(&skqueue, skb);
446 }
447 }
448
449 path->query = NULL;
450 complete(&path->done);
451
452 spin_unlock_irqrestore(&priv->lock, flags);
453
454 while ((skb = __skb_dequeue(&skqueue))) {
455 skb->dev = dev;
456 if (dev_queue_xmit(skb))
457 ipoib_warn(priv, "dev_queue_xmit failed "
458 "to requeue packet\n");
459 }
460 }
461
462 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
463 {
464 struct ipoib_dev_priv *priv = netdev_priv(dev);
465 struct ipoib_path *path;
466
467 if (!priv->broadcast)
468 return NULL;
469
470 path = kzalloc(sizeof *path, GFP_ATOMIC);
471 if (!path)
472 return NULL;
473
474 path->dev = dev;
475
476 skb_queue_head_init(&path->queue);
477
478 INIT_LIST_HEAD(&path->neigh_list);
479
480 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
481 path->pathrec.sgid = priv->local_gid;
482 path->pathrec.pkey = cpu_to_be16(priv->pkey);
483 path->pathrec.numb_path = 1;
484 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
485
486 return path;
487 }
488
489 static int path_rec_start(struct net_device *dev,
490 struct ipoib_path *path)
491 {
492 struct ipoib_dev_priv *priv = netdev_priv(dev);
493
494 ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
495 IPOIB_GID_ARG(path->pathrec.dgid));
496
497 init_completion(&path->done);
498
499 path->query_id =
500 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
501 &path->pathrec,
502 IB_SA_PATH_REC_DGID |
503 IB_SA_PATH_REC_SGID |
504 IB_SA_PATH_REC_NUMB_PATH |
505 IB_SA_PATH_REC_TRAFFIC_CLASS |
506 IB_SA_PATH_REC_PKEY,
507 1000, GFP_ATOMIC,
508 path_rec_completion,
509 path, &path->query);
510 if (path->query_id < 0) {
511 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
512 path->query = NULL;
513 return path->query_id;
514 }
515
516 return 0;
517 }
518
519 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
520 {
521 struct ipoib_dev_priv *priv = netdev_priv(dev);
522 struct ipoib_path *path;
523 struct ipoib_neigh *neigh;
524
525 neigh = ipoib_neigh_alloc(skb->dst->neighbour, skb->dev);
526 if (!neigh) {
527 ++dev->stats.tx_dropped;
528 dev_kfree_skb_any(skb);
529 return;
530 }
531
532 /*
533 * We can only be called from ipoib_start_xmit, so we're
534 * inside tx_lock -- no need to save/restore flags.
535 */
536 spin_lock(&priv->lock);
537
538 path = __path_find(dev, skb->dst->neighbour->ha + 4);
539 if (!path) {
540 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
541 if (!path)
542 goto err_path;
543
544 __path_add(dev, path);
545 }
546
547 list_add_tail(&neigh->list, &path->neigh_list);
548
549 if (path->ah) {
550 kref_get(&path->ah->ref);
551 neigh->ah = path->ah;
552 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
553 sizeof(union ib_gid));
554
555 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
556 if (!ipoib_cm_get(neigh))
557 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
558 if (!ipoib_cm_get(neigh)) {
559 list_del(&neigh->list);
560 if (neigh->ah)
561 ipoib_put_ah(neigh->ah);
562 ipoib_neigh_free(dev, neigh);
563 goto err_drop;
564 }
565 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
566 __skb_queue_tail(&neigh->queue, skb);
567 else {
568 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
569 skb_queue_len(&neigh->queue));
570 goto err_drop;
571 }
572 } else
573 ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
574 } else {
575 neigh->ah = NULL;
576
577 if (!path->query && path_rec_start(dev, path))
578 goto err_list;
579
580 __skb_queue_tail(&neigh->queue, skb);
581 }
582
583 spin_unlock(&priv->lock);
584 return;
585
586 err_list:
587 list_del(&neigh->list);
588
589 err_path:
590 ipoib_neigh_free(dev, neigh);
591 err_drop:
592 ++dev->stats.tx_dropped;
593 dev_kfree_skb_any(skb);
594
595 spin_unlock(&priv->lock);
596 }
597
598 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
599 {
600 struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
601
602 /* Look up path record for unicasts */
603 if (skb->dst->neighbour->ha[4] != 0xff) {
604 neigh_add_path(skb, dev);
605 return;
606 }
607
608 /* Add in the P_Key for multicasts */
609 skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
610 skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
611 ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
612 }
613
614 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
615 struct ipoib_pseudoheader *phdr)
616 {
617 struct ipoib_dev_priv *priv = netdev_priv(dev);
618 struct ipoib_path *path;
619
620 /*
621 * We can only be called from ipoib_start_xmit, so we're
622 * inside tx_lock -- no need to save/restore flags.
623 */
624 spin_lock(&priv->lock);
625
626 path = __path_find(dev, phdr->hwaddr + 4);
627 if (!path) {
628 path = path_rec_create(dev, phdr->hwaddr + 4);
629 if (path) {
630 /* put pseudoheader back on for next time */
631 skb_push(skb, sizeof *phdr);
632 __skb_queue_tail(&path->queue, skb);
633
634 if (path_rec_start(dev, path)) {
635 spin_unlock(&priv->lock);
636 path_free(dev, path);
637 return;
638 } else
639 __path_add(dev, path);
640 } else {
641 ++dev->stats.tx_dropped;
642 dev_kfree_skb_any(skb);
643 }
644
645 spin_unlock(&priv->lock);
646 return;
647 }
648
649 if (path->ah) {
650 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
651 be16_to_cpu(path->pathrec.dlid));
652
653 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
654 } else if ((path->query || !path_rec_start(dev, path)) &&
655 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
656 /* put pseudoheader back on for next time */
657 skb_push(skb, sizeof *phdr);
658 __skb_queue_tail(&path->queue, skb);
659 } else {
660 ++dev->stats.tx_dropped;
661 dev_kfree_skb_any(skb);
662 }
663
664 spin_unlock(&priv->lock);
665 }
666
667 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
668 {
669 struct ipoib_dev_priv *priv = netdev_priv(dev);
670 struct ipoib_neigh *neigh;
671 unsigned long flags;
672
673 if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
674 return NETDEV_TX_LOCKED;
675
676 if (likely(skb->dst && skb->dst->neighbour)) {
677 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
678 ipoib_path_lookup(skb, dev);
679 goto out;
680 }
681
682 neigh = *to_ipoib_neigh(skb->dst->neighbour);
683
684 if (neigh->ah)
685 if (unlikely((memcmp(&neigh->dgid.raw,
686 skb->dst->neighbour->ha + 4,
687 sizeof(union ib_gid))) ||
688 (neigh->dev != dev))) {
689 spin_lock(&priv->lock);
690 /*
691 * It's safe to call ipoib_put_ah() inside
692 * priv->lock here, because we know that
693 * path->ah will always hold one more reference,
694 * so ipoib_put_ah() will never do more than
695 * decrement the ref count.
696 */
697 ipoib_put_ah(neigh->ah);
698 list_del(&neigh->list);
699 ipoib_neigh_free(dev, neigh);
700 spin_unlock(&priv->lock);
701 ipoib_path_lookup(skb, dev);
702 goto out;
703 }
704
705 if (ipoib_cm_get(neigh)) {
706 if (ipoib_cm_up(neigh)) {
707 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
708 goto out;
709 }
710 } else if (neigh->ah) {
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 ++dev->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 ++dev->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 void ipoib_timeout(struct net_device *dev)
761 {
762 struct ipoib_dev_priv *priv = netdev_priv(dev);
763
764 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
765 jiffies_to_msecs(jiffies - dev->trans_start));
766 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
767 netif_queue_stopped(dev),
768 priv->tx_head, priv->tx_tail);
769 /* XXX reset QP, etc. */
770 }
771
772 static int ipoib_hard_header(struct sk_buff *skb,
773 struct net_device *dev,
774 unsigned short type,
775 const void *daddr, const void *saddr, unsigned len)
776 {
777 struct ipoib_header *header;
778
779 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
780
781 header->proto = htons(type);
782 header->reserved = 0;
783
784 /*
785 * If we don't have a neighbour structure, stuff the
786 * destination address onto the front of the skb so we can
787 * figure out where to send the packet later.
788 */
789 if ((!skb->dst || !skb->dst->neighbour) && daddr) {
790 struct ipoib_pseudoheader *phdr =
791 (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
792 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
793 }
794
795 return 0;
796 }
797
798 static void ipoib_set_mcast_list(struct net_device *dev)
799 {
800 struct ipoib_dev_priv *priv = netdev_priv(dev);
801
802 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
803 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
804 return;
805 }
806
807 queue_work(ipoib_workqueue, &priv->restart_task);
808 }
809
810 static void ipoib_neigh_cleanup(struct neighbour *n)
811 {
812 struct ipoib_neigh *neigh;
813 struct ipoib_dev_priv *priv = netdev_priv(n->dev);
814 unsigned long flags;
815 struct ipoib_ah *ah = NULL;
816
817 neigh = *to_ipoib_neigh(n);
818 if (neigh)
819 priv = netdev_priv(neigh->dev);
820 else
821 return;
822 ipoib_dbg(priv,
823 "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
824 IPOIB_QPN(n->ha),
825 IPOIB_GID_RAW_ARG(n->ha + 4));
826
827 spin_lock_irqsave(&priv->lock, flags);
828
829 if (neigh->ah)
830 ah = neigh->ah;
831 list_del(&neigh->list);
832 ipoib_neigh_free(n->dev, neigh);
833
834 spin_unlock_irqrestore(&priv->lock, flags);
835
836 if (ah)
837 ipoib_put_ah(ah);
838 }
839
840 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
841 struct net_device *dev)
842 {
843 struct ipoib_neigh *neigh;
844
845 neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
846 if (!neigh)
847 return NULL;
848
849 neigh->neighbour = neighbour;
850 neigh->dev = dev;
851 *to_ipoib_neigh(neighbour) = neigh;
852 skb_queue_head_init(&neigh->queue);
853 ipoib_cm_set(neigh, NULL);
854
855 return neigh;
856 }
857
858 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
859 {
860 struct sk_buff *skb;
861 *to_ipoib_neigh(neigh->neighbour) = NULL;
862 while ((skb = __skb_dequeue(&neigh->queue))) {
863 ++dev->stats.tx_dropped;
864 dev_kfree_skb_any(skb);
865 }
866 if (ipoib_cm_get(neigh))
867 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
868 kfree(neigh);
869 }
870
871 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
872 {
873 parms->neigh_cleanup = ipoib_neigh_cleanup;
874
875 return 0;
876 }
877
878 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
879 {
880 struct ipoib_dev_priv *priv = netdev_priv(dev);
881
882 /* Allocate RX/TX "rings" to hold queued skbs */
883 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
884 GFP_KERNEL);
885 if (!priv->rx_ring) {
886 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
887 ca->name, ipoib_recvq_size);
888 goto out;
889 }
890
891 priv->tx_ring = vmalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
892 if (!priv->tx_ring) {
893 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
894 ca->name, ipoib_sendq_size);
895 goto out_rx_ring_cleanup;
896 }
897 memset(priv->tx_ring, 0, ipoib_sendq_size * sizeof *priv->tx_ring);
898
899 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
900
901 if (ipoib_ib_dev_init(dev, ca, port))
902 goto out_tx_ring_cleanup;
903
904 return 0;
905
906 out_tx_ring_cleanup:
907 vfree(priv->tx_ring);
908
909 out_rx_ring_cleanup:
910 kfree(priv->rx_ring);
911
912 out:
913 return -ENOMEM;
914 }
915
916 void ipoib_dev_cleanup(struct net_device *dev)
917 {
918 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
919
920 ipoib_delete_debug_files(dev);
921
922 /* Delete any child interfaces first */
923 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
924 unregister_netdev(cpriv->dev);
925 ipoib_dev_cleanup(cpriv->dev);
926 free_netdev(cpriv->dev);
927 }
928
929 ipoib_ib_dev_cleanup(dev);
930
931 kfree(priv->rx_ring);
932 vfree(priv->tx_ring);
933
934 priv->rx_ring = NULL;
935 priv->tx_ring = NULL;
936 }
937
938 static const struct header_ops ipoib_header_ops = {
939 .create = ipoib_hard_header,
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->tx_timeout = ipoib_timeout;
951 dev->header_ops = &ipoib_header_ops;
952 dev->set_multicast_list = ipoib_set_mcast_list;
953 dev->neigh_setup = ipoib_neigh_setup_dev;
954
955 netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
956
957 dev->watchdog_timeo = HZ;
958
959 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
960
961 /*
962 * We add in INFINIBAND_ALEN to allow for the destination
963 * address "pseudoheader" for skbs without neighbour struct.
964 */
965 dev->hard_header_len = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
966 dev->addr_len = INFINIBAND_ALEN;
967 dev->type = ARPHRD_INFINIBAND;
968 dev->tx_queue_len = ipoib_sendq_size * 2;
969 dev->features = (NETIF_F_VLAN_CHALLENGED |
970 NETIF_F_LLTX |
971 NETIF_F_HIGHDMA);
972
973 /* MTU will be reset when mcast join happens */
974 dev->mtu = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
975 priv->mcast_mtu = priv->admin_mtu = dev->mtu;
976
977 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
978
979 netif_carrier_off(dev);
980
981 priv->dev = dev;
982
983 spin_lock_init(&priv->lock);
984 spin_lock_init(&priv->tx_lock);
985
986 mutex_init(&priv->mcast_mutex);
987 mutex_init(&priv->vlan_mutex);
988
989 INIT_LIST_HEAD(&priv->path_list);
990 INIT_LIST_HEAD(&priv->child_intfs);
991 INIT_LIST_HEAD(&priv->dead_ahs);
992 INIT_LIST_HEAD(&priv->multicast_list);
993
994 INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
995 INIT_WORK(&priv->pkey_event_task, ipoib_pkey_event);
996 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
997 INIT_WORK(&priv->flush_task, ipoib_ib_dev_flush);
998 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
999 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1000 }
1001
1002 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1003 {
1004 struct net_device *dev;
1005
1006 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1007 ipoib_setup);
1008 if (!dev)
1009 return NULL;
1010
1011 return netdev_priv(dev);
1012 }
1013
1014 static ssize_t show_pkey(struct device *dev,
1015 struct device_attribute *attr, char *buf)
1016 {
1017 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1018
1019 return sprintf(buf, "0x%04x\n", priv->pkey);
1020 }
1021 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1022
1023 static ssize_t show_umcast(struct device *dev,
1024 struct device_attribute *attr, char *buf)
1025 {
1026 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1027
1028 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1029 }
1030
1031 static ssize_t set_umcast(struct device *dev,
1032 struct device_attribute *attr,
1033 const char *buf, size_t count)
1034 {
1035 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1036 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1037
1038 if (umcast_val > 0) {
1039 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1040 ipoib_warn(priv, "ignoring multicast groups joined directly "
1041 "by userspace\n");
1042 } else
1043 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1044
1045 return count;
1046 }
1047 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1048
1049 int ipoib_add_umcast_attr(struct net_device *dev)
1050 {
1051 return device_create_file(&dev->dev, &dev_attr_umcast);
1052 }
1053
1054 static ssize_t create_child(struct device *dev,
1055 struct device_attribute *attr,
1056 const char *buf, size_t count)
1057 {
1058 int pkey;
1059 int ret;
1060
1061 if (sscanf(buf, "%i", &pkey) != 1)
1062 return -EINVAL;
1063
1064 if (pkey < 0 || pkey > 0xffff)
1065 return -EINVAL;
1066
1067 /*
1068 * Set the full membership bit, so that we join the right
1069 * broadcast group, etc.
1070 */
1071 pkey |= 0x8000;
1072
1073 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1074
1075 return ret ? ret : count;
1076 }
1077 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1078
1079 static ssize_t delete_child(struct device *dev,
1080 struct device_attribute *attr,
1081 const char *buf, size_t count)
1082 {
1083 int pkey;
1084 int ret;
1085
1086 if (sscanf(buf, "%i", &pkey) != 1)
1087 return -EINVAL;
1088
1089 if (pkey < 0 || pkey > 0xffff)
1090 return -EINVAL;
1091
1092 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1093
1094 return ret ? ret : count;
1095
1096 }
1097 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1098
1099 int ipoib_add_pkey_attr(struct net_device *dev)
1100 {
1101 return device_create_file(&dev->dev, &dev_attr_pkey);
1102 }
1103
1104 static struct net_device *ipoib_add_port(const char *format,
1105 struct ib_device *hca, u8 port)
1106 {
1107 struct ipoib_dev_priv *priv;
1108 int result = -ENOMEM;
1109
1110 priv = ipoib_intf_alloc(format);
1111 if (!priv)
1112 goto alloc_mem_failed;
1113
1114 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1115
1116 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1117 if (result) {
1118 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1119 hca->name, port, result);
1120 goto device_init_failed;
1121 }
1122
1123 /*
1124 * Set the full membership bit, so that we join the right
1125 * broadcast group, etc.
1126 */
1127 priv->pkey |= 0x8000;
1128
1129 priv->dev->broadcast[8] = priv->pkey >> 8;
1130 priv->dev->broadcast[9] = priv->pkey & 0xff;
1131
1132 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1133 if (result) {
1134 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1135 hca->name, port, result);
1136 goto device_init_failed;
1137 } else
1138 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1139
1140
1141 result = ipoib_dev_init(priv->dev, hca, port);
1142 if (result < 0) {
1143 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1144 hca->name, port, result);
1145 goto device_init_failed;
1146 }
1147
1148 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1149 priv->ca, ipoib_event);
1150 result = ib_register_event_handler(&priv->event_handler);
1151 if (result < 0) {
1152 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1153 "port %d (ret = %d)\n",
1154 hca->name, port, result);
1155 goto event_failed;
1156 }
1157
1158 result = register_netdev(priv->dev);
1159 if (result) {
1160 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1161 hca->name, port, result);
1162 goto register_failed;
1163 }
1164
1165 ipoib_create_debug_files(priv->dev);
1166
1167 if (ipoib_cm_add_mode_attr(priv->dev))
1168 goto sysfs_failed;
1169 if (ipoib_add_pkey_attr(priv->dev))
1170 goto sysfs_failed;
1171 if (ipoib_add_umcast_attr(priv->dev))
1172 goto sysfs_failed;
1173 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1174 goto sysfs_failed;
1175 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1176 goto sysfs_failed;
1177
1178 return priv->dev;
1179
1180 sysfs_failed:
1181 ipoib_delete_debug_files(priv->dev);
1182 unregister_netdev(priv->dev);
1183
1184 register_failed:
1185 ib_unregister_event_handler(&priv->event_handler);
1186 flush_scheduled_work();
1187
1188 event_failed:
1189 ipoib_dev_cleanup(priv->dev);
1190
1191 device_init_failed:
1192 free_netdev(priv->dev);
1193
1194 alloc_mem_failed:
1195 return ERR_PTR(result);
1196 }
1197
1198 static void ipoib_add_one(struct ib_device *device)
1199 {
1200 struct list_head *dev_list;
1201 struct net_device *dev;
1202 struct ipoib_dev_priv *priv;
1203 int s, e, p;
1204
1205 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1206 return;
1207
1208 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1209 if (!dev_list)
1210 return;
1211
1212 INIT_LIST_HEAD(dev_list);
1213
1214 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1215 s = 0;
1216 e = 0;
1217 } else {
1218 s = 1;
1219 e = device->phys_port_cnt;
1220 }
1221
1222 for (p = s; p <= e; ++p) {
1223 dev = ipoib_add_port("ib%d", device, p);
1224 if (!IS_ERR(dev)) {
1225 priv = netdev_priv(dev);
1226 list_add_tail(&priv->list, dev_list);
1227 }
1228 }
1229
1230 ib_set_client_data(device, &ipoib_client, dev_list);
1231 }
1232
1233 static void ipoib_remove_one(struct ib_device *device)
1234 {
1235 struct ipoib_dev_priv *priv, *tmp;
1236 struct list_head *dev_list;
1237
1238 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1239 return;
1240
1241 dev_list = ib_get_client_data(device, &ipoib_client);
1242
1243 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1244 ib_unregister_event_handler(&priv->event_handler);
1245 flush_scheduled_work();
1246
1247 unregister_netdev(priv->dev);
1248 ipoib_dev_cleanup(priv->dev);
1249 free_netdev(priv->dev);
1250 }
1251
1252 kfree(dev_list);
1253 }
1254
1255 static int __init ipoib_init_module(void)
1256 {
1257 int ret;
1258
1259 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1260 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1261 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1262
1263 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1264 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1265 ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1266 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1267 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1268 #endif
1269
1270 ret = ipoib_register_debugfs();
1271 if (ret)
1272 return ret;
1273
1274 /*
1275 * We create our own workqueue mainly because we want to be
1276 * able to flush it when devices are being removed. We can't
1277 * use schedule_work()/flush_scheduled_work() because both
1278 * unregister_netdev() and linkwatch_event take the rtnl lock,
1279 * so flush_scheduled_work() can deadlock during device
1280 * removal.
1281 */
1282 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1283 if (!ipoib_workqueue) {
1284 ret = -ENOMEM;
1285 goto err_fs;
1286 }
1287
1288 ib_sa_register_client(&ipoib_sa_client);
1289
1290 ret = ib_register_client(&ipoib_client);
1291 if (ret)
1292 goto err_sa;
1293
1294 return 0;
1295
1296 err_sa:
1297 ib_sa_unregister_client(&ipoib_sa_client);
1298 destroy_workqueue(ipoib_workqueue);
1299
1300 err_fs:
1301 ipoib_unregister_debugfs();
1302
1303 return ret;
1304 }
1305
1306 static void __exit ipoib_cleanup_module(void)
1307 {
1308 ib_unregister_client(&ipoib_client);
1309 ib_sa_unregister_client(&ipoib_sa_client);
1310 ipoib_unregister_debugfs();
1311 destroy_workqueue(ipoib_workqueue);
1312 }
1313
1314 module_init(ipoib_init_module);
1315 module_exit(ipoib_cleanup_module);
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