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[NET]: Move hardware header operations out of netdevice.
[linux-2.6/kmemtrace.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
blob2bd76ef57154a0b9cd1115f9c1490f5f5b46437d
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 napi_enable(&priv->napi);
102 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
103
104 if (ipoib_pkey_dev_delay_open(dev))
105 return 0;
106
107 if (ipoib_ib_dev_open(dev)) {
108 napi_disable(&priv->napi);
109 return -EINVAL;
110 }
111
112 if (ipoib_ib_dev_up(dev)) {
113 ipoib_ib_dev_stop(dev, 1);
114 napi_disable(&priv->napi);
115 return -EINVAL;
116 }
117
118 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
119 struct ipoib_dev_priv *cpriv;
120
121 /* Bring up any child interfaces too */
122 mutex_lock(&priv->vlan_mutex);
123 list_for_each_entry(cpriv, &priv->child_intfs, list) {
124 int flags;
125
126 flags = cpriv->dev->flags;
127 if (flags & IFF_UP)
128 continue;
129
130 dev_change_flags(cpriv->dev, flags | IFF_UP);
131 }
132 mutex_unlock(&priv->vlan_mutex);
133 }
134
135 netif_start_queue(dev);
136
137 return 0;
138 }
139
140 static int ipoib_stop(struct net_device *dev)
141 {
142 struct ipoib_dev_priv *priv = netdev_priv(dev);
143
144 ipoib_dbg(priv, "stopping interface\n");
145
146 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
147 napi_disable(&priv->napi);
148
149 netif_stop_queue(dev);
150
151 clear_bit(IPOIB_FLAG_NETIF_STOPPED, &priv->flags);
152
153 /*
154 * Now flush workqueue to make sure a scheduled task doesn't
155 * bring our internal state back up.
156 */
157 flush_workqueue(ipoib_workqueue);
158
159 ipoib_ib_dev_down(dev, 1);
160 ipoib_ib_dev_stop(dev, 1);
161
162 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
163 struct ipoib_dev_priv *cpriv;
164
165 /* Bring down any child interfaces too */
166 mutex_lock(&priv->vlan_mutex);
167 list_for_each_entry(cpriv, &priv->child_intfs, list) {
168 int flags;
169
170 flags = cpriv->dev->flags;
171 if (!(flags & IFF_UP))
172 continue;
173
174 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
175 }
176 mutex_unlock(&priv->vlan_mutex);
177 }
178
179 return 0;
180 }
181
182 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
183 {
184 struct ipoib_dev_priv *priv = netdev_priv(dev);
185
186 /* dev->mtu > 2K ==> connected mode */
187 if (ipoib_cm_admin_enabled(dev) && new_mtu <= IPOIB_CM_MTU) {
188 if (new_mtu > priv->mcast_mtu)
189 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
190 priv->mcast_mtu);
191 dev->mtu = new_mtu;
192 return 0;
193 }
194
195 if (new_mtu > IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN) {
196 return -EINVAL;
197 }
198
199 priv->admin_mtu = new_mtu;
200
201 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
202
203 return 0;
204 }
205
206 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
207 {
208 struct ipoib_dev_priv *priv = netdev_priv(dev);
209 struct rb_node *n = priv->path_tree.rb_node;
210 struct ipoib_path *path;
211 int ret;
212
213 while (n) {
214 path = rb_entry(n, struct ipoib_path, rb_node);
215
216 ret = memcmp(gid, path->pathrec.dgid.raw,
217 sizeof (union ib_gid));
218
219 if (ret < 0)
220 n = n->rb_left;
221 else if (ret > 0)
222 n = n->rb_right;
223 else
224 return path;
225 }
226
227 return NULL;
228 }
229
230 static int __path_add(struct net_device *dev, struct ipoib_path *path)
231 {
232 struct ipoib_dev_priv *priv = netdev_priv(dev);
233 struct rb_node **n = &priv->path_tree.rb_node;
234 struct rb_node *pn = NULL;
235 struct ipoib_path *tpath;
236 int ret;
237
238 while (*n) {
239 pn = *n;
240 tpath = rb_entry(pn, struct ipoib_path, rb_node);
241
242 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
243 sizeof (union ib_gid));
244 if (ret < 0)
245 n = &pn->rb_left;
246 else if (ret > 0)
247 n = &pn->rb_right;
248 else
249 return -EEXIST;
250 }
251
252 rb_link_node(&path->rb_node, pn, n);
253 rb_insert_color(&path->rb_node, &priv->path_tree);
254
255 list_add_tail(&path->list, &priv->path_list);
256
257 return 0;
258 }
259
260 static void path_free(struct net_device *dev, struct ipoib_path *path)
261 {
262 struct ipoib_dev_priv *priv = netdev_priv(dev);
263 struct ipoib_neigh *neigh, *tn;
264 struct sk_buff *skb;
265 unsigned long flags;
266
267 while ((skb = __skb_dequeue(&path->queue)))
268 dev_kfree_skb_irq(skb);
269
270 spin_lock_irqsave(&priv->lock, flags);
271
272 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
273 /*
274 * It's safe to call ipoib_put_ah() inside priv->lock
275 * here, because we know that path->ah will always
276 * hold one more reference, so ipoib_put_ah() will
277 * never do more than decrement the ref count.
278 */
279 if (neigh->ah)
280 ipoib_put_ah(neigh->ah);
281
282 ipoib_neigh_free(dev, neigh);
283 }
284
285 spin_unlock_irqrestore(&priv->lock, flags);
286
287 if (path->ah)
288 ipoib_put_ah(path->ah);
289
290 kfree(path);
291 }
292
293 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
294
295 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
296 {
297 struct ipoib_path_iter *iter;
298
299 iter = kmalloc(sizeof *iter, GFP_KERNEL);
300 if (!iter)
301 return NULL;
302
303 iter->dev = dev;
304 memset(iter->path.pathrec.dgid.raw, 0, 16);
305
306 if (ipoib_path_iter_next(iter)) {
307 kfree(iter);
308 return NULL;
309 }
310
311 return iter;
312 }
313
314 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
315 {
316 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
317 struct rb_node *n;
318 struct ipoib_path *path;
319 int ret = 1;
320
321 spin_lock_irq(&priv->lock);
322
323 n = rb_first(&priv->path_tree);
324
325 while (n) {
326 path = rb_entry(n, struct ipoib_path, rb_node);
327
328 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
329 sizeof (union ib_gid)) < 0) {
330 iter->path = *path;
331 ret = 0;
332 break;
333 }
334
335 n = rb_next(n);
336 }
337
338 spin_unlock_irq(&priv->lock);
339
340 return ret;
341 }
342
343 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
344 struct ipoib_path *path)
345 {
346 *path = iter->path;
347 }
348
349 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
350
351 void ipoib_flush_paths(struct net_device *dev)
352 {
353 struct ipoib_dev_priv *priv = netdev_priv(dev);
354 struct ipoib_path *path, *tp;
355 LIST_HEAD(remove_list);
356
357 spin_lock_irq(&priv->tx_lock);
358 spin_lock(&priv->lock);
359
360 list_splice(&priv->path_list, &remove_list);
361 INIT_LIST_HEAD(&priv->path_list);
362
363 list_for_each_entry(path, &remove_list, list)
364 rb_erase(&path->rb_node, &priv->path_tree);
365
366 list_for_each_entry_safe(path, tp, &remove_list, list) {
367 if (path->query)
368 ib_sa_cancel_query(path->query_id, path->query);
369 spin_unlock(&priv->lock);
370 spin_unlock_irq(&priv->tx_lock);
371 wait_for_completion(&path->done);
372 path_free(dev, path);
373 spin_lock_irq(&priv->tx_lock);
374 spin_lock(&priv->lock);
375 }
376 spin_unlock(&priv->lock);
377 spin_unlock_irq(&priv->tx_lock);
378 }
379
380 static void path_rec_completion(int status,
381 struct ib_sa_path_rec *pathrec,
382 void *path_ptr)
383 {
384 struct ipoib_path *path = path_ptr;
385 struct net_device *dev = path->dev;
386 struct ipoib_dev_priv *priv = netdev_priv(dev);
387 struct ipoib_ah *ah = NULL;
388 struct ipoib_neigh *neigh, *tn;
389 struct sk_buff_head skqueue;
390 struct sk_buff *skb;
391 unsigned long flags;
392
393 if (!status)
394 ipoib_dbg(priv, "PathRec LID 0x%04x for GID " IPOIB_GID_FMT "\n",
395 be16_to_cpu(pathrec->dlid), IPOIB_GID_ARG(pathrec->dgid));
396 else
397 ipoib_dbg(priv, "PathRec status %d for GID " IPOIB_GID_FMT "\n",
398 status, IPOIB_GID_ARG(path->pathrec.dgid));
399
400 skb_queue_head_init(&skqueue);
401
402 if (!status) {
403 struct ib_ah_attr av;
404
405 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
406 ah = ipoib_create_ah(dev, priv->pd, &av);
407 }
408
409 spin_lock_irqsave(&priv->lock, flags);
410
411 path->ah = ah;
412
413 if (ah) {
414 path->pathrec = *pathrec;
415
416 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
417 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
418
419 while ((skb = __skb_dequeue(&path->queue)))
420 __skb_queue_tail(&skqueue, skb);
421
422 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
423 kref_get(&path->ah->ref);
424 neigh->ah = path->ah;
425 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
426 sizeof(union ib_gid));
427
428 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
429 if (!ipoib_cm_get(neigh))
430 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
431 path,
432 neigh));
433 if (!ipoib_cm_get(neigh)) {
434 list_del(&neigh->list);
435 if (neigh->ah)
436 ipoib_put_ah(neigh->ah);
437 ipoib_neigh_free(dev, neigh);
438 continue;
439 }
440 }
441
442 while ((skb = __skb_dequeue(&neigh->queue)))
443 __skb_queue_tail(&skqueue, skb);
444 }
445 }
446
447 path->query = NULL;
448 complete(&path->done);
449
450 spin_unlock_irqrestore(&priv->lock, flags);
451
452 while ((skb = __skb_dequeue(&skqueue))) {
453 skb->dev = dev;
454 if (dev_queue_xmit(skb))
455 ipoib_warn(priv, "dev_queue_xmit failed "
456 "to requeue packet\n");
457 }
458 }
459
460 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
461 {
462 struct ipoib_dev_priv *priv = netdev_priv(dev);
463 struct ipoib_path *path;
464
465 path = kzalloc(sizeof *path, GFP_ATOMIC);
466 if (!path)
467 return NULL;
468
469 path->dev = dev;
470
471 skb_queue_head_init(&path->queue);
472
473 INIT_LIST_HEAD(&path->neigh_list);
474
475 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
476 path->pathrec.sgid = priv->local_gid;
477 path->pathrec.pkey = cpu_to_be16(priv->pkey);
478 path->pathrec.numb_path = 1;
479
480 return path;
481 }
482
483 static int path_rec_start(struct net_device *dev,
484 struct ipoib_path *path)
485 {
486 struct ipoib_dev_priv *priv = netdev_priv(dev);
487
488 ipoib_dbg(priv, "Start path record lookup for " IPOIB_GID_FMT "\n",
489 IPOIB_GID_ARG(path->pathrec.dgid));
490
491 init_completion(&path->done);
492
493 path->query_id =
494 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
495 &path->pathrec,
496 IB_SA_PATH_REC_DGID |
497 IB_SA_PATH_REC_SGID |
498 IB_SA_PATH_REC_NUMB_PATH |
499 IB_SA_PATH_REC_PKEY,
500 1000, GFP_ATOMIC,
501 path_rec_completion,
502 path, &path->query);
503 if (path->query_id < 0) {
504 ipoib_warn(priv, "ib_sa_path_rec_get failed\n");
505 path->query = NULL;
506 return path->query_id;
507 }
508
509 return 0;
510 }
511
512 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
513 {
514 struct ipoib_dev_priv *priv = netdev_priv(dev);
515 struct ipoib_path *path;
516 struct ipoib_neigh *neigh;
517
518 neigh = ipoib_neigh_alloc(skb->dst->neighbour);
519 if (!neigh) {
520 ++priv->stats.tx_dropped;
521 dev_kfree_skb_any(skb);
522 return;
523 }
524
525 /*
526 * We can only be called from ipoib_start_xmit, so we're
527 * inside tx_lock -- no need to save/restore flags.
528 */
529 spin_lock(&priv->lock);
530
531 path = __path_find(dev, skb->dst->neighbour->ha + 4);
532 if (!path) {
533 path = path_rec_create(dev, skb->dst->neighbour->ha + 4);
534 if (!path)
535 goto err_path;
536
537 __path_add(dev, path);
538 }
539
540 list_add_tail(&neigh->list, &path->neigh_list);
541
542 if (path->ah) {
543 kref_get(&path->ah->ref);
544 neigh->ah = path->ah;
545 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
546 sizeof(union ib_gid));
547
548 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
549 if (!ipoib_cm_get(neigh))
550 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
551 if (!ipoib_cm_get(neigh)) {
552 list_del(&neigh->list);
553 if (neigh->ah)
554 ipoib_put_ah(neigh->ah);
555 ipoib_neigh_free(dev, neigh);
556 goto err_drop;
557 }
558 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
559 __skb_queue_tail(&neigh->queue, skb);
560 else {
561 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
562 skb_queue_len(&neigh->queue));
563 goto err_drop;
564 }
565 } else
566 ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb->dst->neighbour->ha));
567 } else {
568 neigh->ah = NULL;
569
570 if (!path->query && path_rec_start(dev, path))
571 goto err_list;
572
573 __skb_queue_tail(&neigh->queue, skb);
574 }
575
576 spin_unlock(&priv->lock);
577 return;
578
579 err_list:
580 list_del(&neigh->list);
581
582 err_path:
583 ipoib_neigh_free(dev, neigh);
584 err_drop:
585 ++priv->stats.tx_dropped;
586 dev_kfree_skb_any(skb);
587
588 spin_unlock(&priv->lock);
589 }
590
591 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
592 {
593 struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
594
595 /* Look up path record for unicasts */
596 if (skb->dst->neighbour->ha[4] != 0xff) {
597 neigh_add_path(skb, dev);
598 return;
599 }
600
601 /* Add in the P_Key for multicasts */
602 skb->dst->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
603 skb->dst->neighbour->ha[9] = priv->pkey & 0xff;
604 ipoib_mcast_send(dev, skb->dst->neighbour->ha + 4, skb);
605 }
606
607 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
608 struct ipoib_pseudoheader *phdr)
609 {
610 struct ipoib_dev_priv *priv = netdev_priv(dev);
611 struct ipoib_path *path;
612
613 /*
614 * We can only be called from ipoib_start_xmit, so we're
615 * inside tx_lock -- no need to save/restore flags.
616 */
617 spin_lock(&priv->lock);
618
619 path = __path_find(dev, phdr->hwaddr + 4);
620 if (!path) {
621 path = path_rec_create(dev, phdr->hwaddr + 4);
622 if (path) {
623 /* put pseudoheader back on for next time */
624 skb_push(skb, sizeof *phdr);
625 __skb_queue_tail(&path->queue, skb);
626
627 if (path_rec_start(dev, path)) {
628 spin_unlock(&priv->lock);
629 path_free(dev, path);
630 return;
631 } else
632 __path_add(dev, path);
633 } else {
634 ++priv->stats.tx_dropped;
635 dev_kfree_skb_any(skb);
636 }
637
638 spin_unlock(&priv->lock);
639 return;
640 }
641
642 if (path->ah) {
643 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
644 be16_to_cpu(path->pathrec.dlid));
645
646 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
647 } else if ((path->query || !path_rec_start(dev, path)) &&
648 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
649 /* put pseudoheader back on for next time */
650 skb_push(skb, sizeof *phdr);
651 __skb_queue_tail(&path->queue, skb);
652 } else {
653 ++priv->stats.tx_dropped;
654 dev_kfree_skb_any(skb);
655 }
656
657 spin_unlock(&priv->lock);
658 }
659
660 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
661 {
662 struct ipoib_dev_priv *priv = netdev_priv(dev);
663 struct ipoib_neigh *neigh;
664 unsigned long flags;
665
666 if (unlikely(!spin_trylock_irqsave(&priv->tx_lock, flags)))
667 return NETDEV_TX_LOCKED;
668
669 /*
670 * Check if our queue is stopped. Since we have the LLTX bit
671 * set, we can't rely on netif_stop_queue() preventing our
672 * xmit function from being called with a full queue.
673 */
674 if (unlikely(netif_queue_stopped(dev))) {
675 spin_unlock_irqrestore(&priv->tx_lock, flags);
676 return NETDEV_TX_BUSY;
677 }
678
679 if (likely(skb->dst && skb->dst->neighbour)) {
680 if (unlikely(!*to_ipoib_neigh(skb->dst->neighbour))) {
681 ipoib_path_lookup(skb, dev);
682 goto out;
683 }
684
685 neigh = *to_ipoib_neigh(skb->dst->neighbour);
686
687 if (ipoib_cm_get(neigh)) {
688 if (ipoib_cm_up(neigh)) {
689 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
690 goto out;
691 }
692 } else if (neigh->ah) {
693 if (unlikely(memcmp(&neigh->dgid.raw,
694 skb->dst->neighbour->ha + 4,
695 sizeof(union ib_gid)))) {
696 spin_lock(&priv->lock);
697 /*
698 * It's safe to call ipoib_put_ah() inside
699 * priv->lock here, because we know that
700 * path->ah will always hold one more reference,
701 * so ipoib_put_ah() will never do more than
702 * decrement the ref count.
703 */
704 ipoib_put_ah(neigh->ah);
705 list_del(&neigh->list);
706 ipoib_neigh_free(dev, neigh);
707 spin_unlock(&priv->lock);
708 ipoib_path_lookup(skb, dev);
709 goto out;
710 }
711
712 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb->dst->neighbour->ha));
713 goto out;
714 }
715
716 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
717 spin_lock(&priv->lock);
718 __skb_queue_tail(&neigh->queue, skb);
719 spin_unlock(&priv->lock);
720 } else {
721 ++priv->stats.tx_dropped;
722 dev_kfree_skb_any(skb);
723 }
724 } else {
725 struct ipoib_pseudoheader *phdr =
726 (struct ipoib_pseudoheader *) skb->data;
727 skb_pull(skb, sizeof *phdr);
728
729 if (phdr->hwaddr[4] == 0xff) {
730 /* Add in the P_Key for multicast*/
731 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
732 phdr->hwaddr[9] = priv->pkey & 0xff;
733
734 ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
735 } else {
736 /* unicast GID -- should be ARP or RARP reply */
737
738 if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
739 (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
740 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x "
741 IPOIB_GID_FMT "\n",
742 skb->dst ? "neigh" : "dst",
743 be16_to_cpup((__be16 *) skb->data),
744 IPOIB_QPN(phdr->hwaddr),
745 IPOIB_GID_RAW_ARG(phdr->hwaddr + 4));
746 dev_kfree_skb_any(skb);
747 ++priv->stats.tx_dropped;
748 goto out;
749 }
750
751 unicast_arp_send(skb, dev, phdr);
752 }
753 }
754
755 out:
756 spin_unlock_irqrestore(&priv->tx_lock, flags);
757
758 return NETDEV_TX_OK;
759 }
760
761 static struct net_device_stats *ipoib_get_stats(struct net_device *dev)
762 {
763 struct ipoib_dev_priv *priv = netdev_priv(dev);
764
765 return &priv->stats;
766 }
767
768 static void ipoib_timeout(struct net_device *dev)
769 {
770 struct ipoib_dev_priv *priv = netdev_priv(dev);
771
772 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
773 jiffies_to_msecs(jiffies - dev->trans_start));
774 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
775 netif_queue_stopped(dev),
776 priv->tx_head, priv->tx_tail);
777 /* XXX reset QP, etc. */
778 }
779
780 static int ipoib_hard_header(struct sk_buff *skb,
781 struct net_device *dev,
782 unsigned short type,
783 const void *daddr, const void *saddr, unsigned len)
784 {
785 struct ipoib_header *header;
786
787 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
788
789 header->proto = htons(type);
790 header->reserved = 0;
791
792 /*
793 * If we don't have a neighbour structure, stuff the
794 * destination address onto the front of the skb so we can
795 * figure out where to send the packet later.
796 */
797 if ((!skb->dst || !skb->dst->neighbour) && daddr) {
798 struct ipoib_pseudoheader *phdr =
799 (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
800 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
801 }
802
803 return 0;
804 }
805
806 static void ipoib_set_mcast_list(struct net_device *dev)
807 {
808 struct ipoib_dev_priv *priv = netdev_priv(dev);
809
810 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
811 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
812 return;
813 }
814
815 queue_work(ipoib_workqueue, &priv->restart_task);
816 }
817
818 static void ipoib_neigh_cleanup(struct neighbour *n)
819 {
820 struct ipoib_neigh *neigh;
821 struct ipoib_dev_priv *priv = netdev_priv(n->dev);
822 unsigned long flags;
823 struct ipoib_ah *ah = NULL;
824
825 ipoib_dbg(priv,
826 "neigh_cleanup for %06x " IPOIB_GID_FMT "\n",
827 IPOIB_QPN(n->ha),
828 IPOIB_GID_RAW_ARG(n->ha + 4));
829
830 spin_lock_irqsave(&priv->lock, flags);
831
832 neigh = *to_ipoib_neigh(n);
833 if (neigh) {
834 if (neigh->ah)
835 ah = neigh->ah;
836 list_del(&neigh->list);
837 ipoib_neigh_free(n->dev, neigh);
838 }
839
840 spin_unlock_irqrestore(&priv->lock, flags);
841
842 if (ah)
843 ipoib_put_ah(ah);
844 }
845
846 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour)
847 {
848 struct ipoib_neigh *neigh;
849
850 neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
851 if (!neigh)
852 return NULL;
853
854 neigh->neighbour = neighbour;
855 *to_ipoib_neigh(neighbour) = neigh;
856 skb_queue_head_init(&neigh->queue);
857 ipoib_cm_set(neigh, NULL);
858
859 return neigh;
860 }
861
862 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
863 {
864 struct ipoib_dev_priv *priv = netdev_priv(dev);
865 struct sk_buff *skb;
866 *to_ipoib_neigh(neigh->neighbour) = NULL;
867 while ((skb = __skb_dequeue(&neigh->queue))) {
868 ++priv->stats.tx_dropped;
869 dev_kfree_skb_any(skb);
870 }
871 if (ipoib_cm_get(neigh))
872 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
873 kfree(neigh);
874 }
875
876 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
877 {
878 parms->neigh_cleanup = ipoib_neigh_cleanup;
879
880 return 0;
881 }
882
883 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
884 {
885 struct ipoib_dev_priv *priv = netdev_priv(dev);
886
887 /* Allocate RX/TX "rings" to hold queued skbs */
888 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
889 GFP_KERNEL);
890 if (!priv->rx_ring) {
891 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
892 ca->name, ipoib_recvq_size);
893 goto out;
894 }
895
896 priv->tx_ring = kzalloc(ipoib_sendq_size * sizeof *priv->tx_ring,
897 GFP_KERNEL);
898 if (!priv->tx_ring) {
899 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
900 ca->name, ipoib_sendq_size);
901 goto out_rx_ring_cleanup;
902 }
903
904 /* priv->tx_head & tx_tail are already 0 */
905
906 if (ipoib_ib_dev_init(dev, ca, port))
907 goto out_tx_ring_cleanup;
908
909 return 0;
910
911 out_tx_ring_cleanup:
912 kfree(priv->tx_ring);
913
914 out_rx_ring_cleanup:
915 kfree(priv->rx_ring);
916
917 out:
918 return -ENOMEM;
919 }
920
921 void ipoib_dev_cleanup(struct net_device *dev)
922 {
923 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
924
925 ipoib_delete_debug_files(dev);
926
927 /* Delete any child interfaces first */
928 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
929 unregister_netdev(cpriv->dev);
930 ipoib_dev_cleanup(cpriv->dev);
931 free_netdev(cpriv->dev);
932 }
933
934 ipoib_ib_dev_cleanup(dev);
935
936 kfree(priv->rx_ring);
937 kfree(priv->tx_ring);
938
939 priv->rx_ring = NULL;
940 priv->tx_ring = NULL;
941 }
942
943 static const struct header_ops ipoib_header_ops = {
944 .create = ipoib_hard_header,
945 };
946
947 static void ipoib_setup(struct net_device *dev)
948 {
949 struct ipoib_dev_priv *priv = netdev_priv(dev);
950
951 dev->open = ipoib_open;
952 dev->stop = ipoib_stop;
953 dev->change_mtu = ipoib_change_mtu;
954 dev->hard_start_xmit = ipoib_start_xmit;
955 dev->get_stats = ipoib_get_stats;
956 dev->tx_timeout = ipoib_timeout;
957 dev->header_ops = &ipoib_header_ops;
958 dev->set_multicast_list = ipoib_set_mcast_list;
959 dev->neigh_setup = ipoib_neigh_setup_dev;
960
961 netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
962
963 dev->watchdog_timeo = HZ;
964
965 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
966
967 /*
968 * We add in INFINIBAND_ALEN to allow for the destination
969 * address "pseudoheader" for skbs without neighbour struct.
970 */
971 dev->hard_header_len = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
972 dev->addr_len = INFINIBAND_ALEN;
973 dev->type = ARPHRD_INFINIBAND;
974 dev->tx_queue_len = ipoib_sendq_size * 2;
975 dev->features = NETIF_F_VLAN_CHALLENGED | NETIF_F_LLTX;
976
977 /* MTU will be reset when mcast join happens */
978 dev->mtu = IPOIB_PACKET_SIZE - IPOIB_ENCAP_LEN;
979 priv->mcast_mtu = priv->admin_mtu = dev->mtu;
980
981 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
982
983 netif_carrier_off(dev);
984
985 priv->dev = dev;
986
987 spin_lock_init(&priv->lock);
988 spin_lock_init(&priv->tx_lock);
989
990 mutex_init(&priv->mcast_mutex);
991 mutex_init(&priv->vlan_mutex);
992
993 INIT_LIST_HEAD(&priv->path_list);
994 INIT_LIST_HEAD(&priv->child_intfs);
995 INIT_LIST_HEAD(&priv->dead_ahs);
996 INIT_LIST_HEAD(&priv->multicast_list);
997
998 INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
999 INIT_WORK(&priv->pkey_event_task, ipoib_pkey_event);
1000 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1001 INIT_WORK(&priv->flush_task, ipoib_ib_dev_flush);
1002 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1003 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1004 }
1005
1006 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1007 {
1008 struct net_device *dev;
1009
1010 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1011 ipoib_setup);
1012 if (!dev)
1013 return NULL;
1014
1015 return netdev_priv(dev);
1016 }
1017
1018 static ssize_t show_pkey(struct device *dev,
1019 struct device_attribute *attr, char *buf)
1020 {
1021 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1022
1023 return sprintf(buf, "0x%04x\n", priv->pkey);
1024 }
1025 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1026
1027 static ssize_t create_child(struct device *dev,
1028 struct device_attribute *attr,
1029 const char *buf, size_t count)
1030 {
1031 int pkey;
1032 int ret;
1033
1034 if (sscanf(buf, "%i", &pkey) != 1)
1035 return -EINVAL;
1036
1037 if (pkey < 0 || pkey > 0xffff)
1038 return -EINVAL;
1039
1040 /*
1041 * Set the full membership bit, so that we join the right
1042 * broadcast group, etc.
1043 */
1044 pkey |= 0x8000;
1045
1046 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1047
1048 return ret ? ret : count;
1049 }
1050 static DEVICE_ATTR(create_child, S_IWUGO, NULL, create_child);
1051
1052 static ssize_t delete_child(struct device *dev,
1053 struct device_attribute *attr,
1054 const char *buf, size_t count)
1055 {
1056 int pkey;
1057 int ret;
1058
1059 if (sscanf(buf, "%i", &pkey) != 1)
1060 return -EINVAL;
1061
1062 if (pkey < 0 || pkey > 0xffff)
1063 return -EINVAL;
1064
1065 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1066
1067 return ret ? ret : count;
1068
1069 }
1070 static DEVICE_ATTR(delete_child, S_IWUGO, NULL, delete_child);
1071
1072 int ipoib_add_pkey_attr(struct net_device *dev)
1073 {
1074 return device_create_file(&dev->dev, &dev_attr_pkey);
1075 }
1076
1077 static struct net_device *ipoib_add_port(const char *format,
1078 struct ib_device *hca, u8 port)
1079 {
1080 struct ipoib_dev_priv *priv;
1081 int result = -ENOMEM;
1082
1083 priv = ipoib_intf_alloc(format);
1084 if (!priv)
1085 goto alloc_mem_failed;
1086
1087 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1088
1089 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1090 if (result) {
1091 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1092 hca->name, port, result);
1093 goto alloc_mem_failed;
1094 }
1095
1096 /*
1097 * Set the full membership bit, so that we join the right
1098 * broadcast group, etc.
1099 */
1100 priv->pkey |= 0x8000;
1101
1102 priv->dev->broadcast[8] = priv->pkey >> 8;
1103 priv->dev->broadcast[9] = priv->pkey & 0xff;
1104
1105 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1106 if (result) {
1107 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1108 hca->name, port, result);
1109 goto alloc_mem_failed;
1110 } else
1111 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1112
1113
1114 result = ipoib_dev_init(priv->dev, hca, port);
1115 if (result < 0) {
1116 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1117 hca->name, port, result);
1118 goto device_init_failed;
1119 }
1120
1121 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1122 priv->ca, ipoib_event);
1123 result = ib_register_event_handler(&priv->event_handler);
1124 if (result < 0) {
1125 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1126 "port %d (ret = %d)\n",
1127 hca->name, port, result);
1128 goto event_failed;
1129 }
1130
1131 result = register_netdev(priv->dev);
1132 if (result) {
1133 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1134 hca->name, port, result);
1135 goto register_failed;
1136 }
1137
1138 ipoib_create_debug_files(priv->dev);
1139
1140 if (ipoib_cm_add_mode_attr(priv->dev))
1141 goto sysfs_failed;
1142 if (ipoib_add_pkey_attr(priv->dev))
1143 goto sysfs_failed;
1144 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1145 goto sysfs_failed;
1146 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1147 goto sysfs_failed;
1148
1149 return priv->dev;
1150
1151 sysfs_failed:
1152 ipoib_delete_debug_files(priv->dev);
1153 unregister_netdev(priv->dev);
1154
1155 register_failed:
1156 ib_unregister_event_handler(&priv->event_handler);
1157 flush_scheduled_work();
1158
1159 event_failed:
1160 ipoib_dev_cleanup(priv->dev);
1161
1162 device_init_failed:
1163 free_netdev(priv->dev);
1164
1165 alloc_mem_failed:
1166 return ERR_PTR(result);
1167 }
1168
1169 static void ipoib_add_one(struct ib_device *device)
1170 {
1171 struct list_head *dev_list;
1172 struct net_device *dev;
1173 struct ipoib_dev_priv *priv;
1174 int s, e, p;
1175
1176 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1177 return;
1178
1179 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1180 if (!dev_list)
1181 return;
1182
1183 INIT_LIST_HEAD(dev_list);
1184
1185 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1186 s = 0;
1187 e = 0;
1188 } else {
1189 s = 1;
1190 e = device->phys_port_cnt;
1191 }
1192
1193 for (p = s; p <= e; ++p) {
1194 dev = ipoib_add_port("ib%d", device, p);
1195 if (!IS_ERR(dev)) {
1196 priv = netdev_priv(dev);
1197 list_add_tail(&priv->list, dev_list);
1198 }
1199 }
1200
1201 ib_set_client_data(device, &ipoib_client, dev_list);
1202 }
1203
1204 static void ipoib_remove_one(struct ib_device *device)
1205 {
1206 struct ipoib_dev_priv *priv, *tmp;
1207 struct list_head *dev_list;
1208
1209 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1210 return;
1211
1212 dev_list = ib_get_client_data(device, &ipoib_client);
1213
1214 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1215 ib_unregister_event_handler(&priv->event_handler);
1216 flush_scheduled_work();
1217
1218 unregister_netdev(priv->dev);
1219 ipoib_dev_cleanup(priv->dev);
1220 free_netdev(priv->dev);
1221 }
1222
1223 kfree(dev_list);
1224 }
1225
1226 static int __init ipoib_init_module(void)
1227 {
1228 int ret;
1229
1230 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1231 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1232 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1233
1234 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1235 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1236 ipoib_sendq_size = max(ipoib_sendq_size, IPOIB_MIN_QUEUE_SIZE);
1237
1238 ret = ipoib_register_debugfs();
1239 if (ret)
1240 return ret;
1241
1242 /*
1243 * We create our own workqueue mainly because we want to be
1244 * able to flush it when devices are being removed. We can't
1245 * use schedule_work()/flush_scheduled_work() because both
1246 * unregister_netdev() and linkwatch_event take the rtnl lock,
1247 * so flush_scheduled_work() can deadlock during device
1248 * removal.
1249 */
1250 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1251 if (!ipoib_workqueue) {
1252 ret = -ENOMEM;
1253 goto err_fs;
1254 }
1255
1256 ib_sa_register_client(&ipoib_sa_client);
1257
1258 ret = ib_register_client(&ipoib_client);
1259 if (ret)
1260 goto err_sa;
1261
1262 return 0;
1263
1264 err_sa:
1265 ib_sa_unregister_client(&ipoib_sa_client);
1266 destroy_workqueue(ipoib_workqueue);
1267
1268 err_fs:
1269 ipoib_unregister_debugfs();
1270
1271 return ret;
1272 }
1273
1274 static void __exit ipoib_cleanup_module(void)
1275 {
1276 ib_unregister_client(&ipoib_client);
1277 ib_sa_unregister_client(&ipoib_sa_client);
1278 ipoib_unregister_debugfs();
1279 destroy_workqueue(ipoib_workqueue);
1280 }
1281
1282 module_init(ipoib_init_module);
1283 module_exit(ipoib_cleanup_module);
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