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Merge tag 'hwspinlock-3.6-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ohad...
[deliverable/linux.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35 #include "ipoib.h"
36
37 #include <linux/module.h>
38
39 #include <linux/init.h>
40 #include <linux/slab.h>
41 #include <linux/kernel.h>
42 #include <linux/vmalloc.h>
43
44 #include <linux/if_arp.h> /* For ARPHRD_xxx */
45
46 #include <linux/ip.h>
47 #include <linux/in.h>
48
49 #include <linux/jhash.h>
50 #include <net/arp.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 static void ipoib_neigh_reclaim(struct rcu_head *rp);
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 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 goto err_disable;
109
110 if (ipoib_ib_dev_up(dev))
111 goto err_stop;
112
113 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
114 struct ipoib_dev_priv *cpriv;
115
116 /* Bring up any child interfaces too */
117 mutex_lock(&priv->vlan_mutex);
118 list_for_each_entry(cpriv, &priv->child_intfs, list) {
119 int flags;
120
121 flags = cpriv->dev->flags;
122 if (flags & IFF_UP)
123 continue;
124
125 dev_change_flags(cpriv->dev, flags | IFF_UP);
126 }
127 mutex_unlock(&priv->vlan_mutex);
128 }
129
130 netif_start_queue(dev);
131
132 return 0;
133
134 err_stop:
135 ipoib_ib_dev_stop(dev, 1);
136
137 err_disable:
138 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
139
140 return -EINVAL;
141 }
142
143 static int ipoib_stop(struct net_device *dev)
144 {
145 struct ipoib_dev_priv *priv = netdev_priv(dev);
146
147 ipoib_dbg(priv, "stopping interface\n");
148
149 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
150
151 netif_stop_queue(dev);
152
153 ipoib_ib_dev_down(dev, 0);
154 ipoib_ib_dev_stop(dev, 0);
155
156 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
157 struct ipoib_dev_priv *cpriv;
158
159 /* Bring down any child interfaces too */
160 mutex_lock(&priv->vlan_mutex);
161 list_for_each_entry(cpriv, &priv->child_intfs, list) {
162 int flags;
163
164 flags = cpriv->dev->flags;
165 if (!(flags & IFF_UP))
166 continue;
167
168 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
169 }
170 mutex_unlock(&priv->vlan_mutex);
171 }
172
173 return 0;
174 }
175
176 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
177 {
178 struct ipoib_dev_priv *priv = netdev_priv(dev);
179
180 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
181 features &= ~(NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO);
182
183 return features;
184 }
185
186 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
187 {
188 struct ipoib_dev_priv *priv = netdev_priv(dev);
189
190 /* dev->mtu > 2K ==> connected mode */
191 if (ipoib_cm_admin_enabled(dev)) {
192 if (new_mtu > ipoib_cm_max_mtu(dev))
193 return -EINVAL;
194
195 if (new_mtu > priv->mcast_mtu)
196 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
197 priv->mcast_mtu);
198
199 dev->mtu = new_mtu;
200 return 0;
201 }
202
203 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
204 return -EINVAL;
205
206 priv->admin_mtu = new_mtu;
207
208 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
209
210 return 0;
211 }
212
213 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
214 {
215 struct ipoib_dev_priv *priv = netdev_priv(dev);
216 struct rb_node *n = priv->path_tree.rb_node;
217 struct ipoib_path *path;
218 int ret;
219
220 while (n) {
221 path = rb_entry(n, struct ipoib_path, rb_node);
222
223 ret = memcmp(gid, path->pathrec.dgid.raw,
224 sizeof (union ib_gid));
225
226 if (ret < 0)
227 n = n->rb_left;
228 else if (ret > 0)
229 n = n->rb_right;
230 else
231 return path;
232 }
233
234 return NULL;
235 }
236
237 static int __path_add(struct net_device *dev, struct ipoib_path *path)
238 {
239 struct ipoib_dev_priv *priv = netdev_priv(dev);
240 struct rb_node **n = &priv->path_tree.rb_node;
241 struct rb_node *pn = NULL;
242 struct ipoib_path *tpath;
243 int ret;
244
245 while (*n) {
246 pn = *n;
247 tpath = rb_entry(pn, struct ipoib_path, rb_node);
248
249 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
250 sizeof (union ib_gid));
251 if (ret < 0)
252 n = &pn->rb_left;
253 else if (ret > 0)
254 n = &pn->rb_right;
255 else
256 return -EEXIST;
257 }
258
259 rb_link_node(&path->rb_node, pn, n);
260 rb_insert_color(&path->rb_node, &priv->path_tree);
261
262 list_add_tail(&path->list, &priv->path_list);
263
264 return 0;
265 }
266
267 static void path_free(struct net_device *dev, struct ipoib_path *path)
268 {
269 struct sk_buff *skb;
270
271 while ((skb = __skb_dequeue(&path->queue)))
272 dev_kfree_skb_irq(skb);
273
274 ipoib_dbg(netdev_priv(dev), "path_free\n");
275
276 /* remove all neigh connected to this path */
277 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
278
279 if (path->ah)
280 ipoib_put_ah(path->ah);
281
282 kfree(path);
283 }
284
285 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
286
287 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
288 {
289 struct ipoib_path_iter *iter;
290
291 iter = kmalloc(sizeof *iter, GFP_KERNEL);
292 if (!iter)
293 return NULL;
294
295 iter->dev = dev;
296 memset(iter->path.pathrec.dgid.raw, 0, 16);
297
298 if (ipoib_path_iter_next(iter)) {
299 kfree(iter);
300 return NULL;
301 }
302
303 return iter;
304 }
305
306 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
307 {
308 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
309 struct rb_node *n;
310 struct ipoib_path *path;
311 int ret = 1;
312
313 spin_lock_irq(&priv->lock);
314
315 n = rb_first(&priv->path_tree);
316
317 while (n) {
318 path = rb_entry(n, struct ipoib_path, rb_node);
319
320 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
321 sizeof (union ib_gid)) < 0) {
322 iter->path = *path;
323 ret = 0;
324 break;
325 }
326
327 n = rb_next(n);
328 }
329
330 spin_unlock_irq(&priv->lock);
331
332 return ret;
333 }
334
335 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
336 struct ipoib_path *path)
337 {
338 *path = iter->path;
339 }
340
341 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
342
343 void ipoib_mark_paths_invalid(struct net_device *dev)
344 {
345 struct ipoib_dev_priv *priv = netdev_priv(dev);
346 struct ipoib_path *path, *tp;
347
348 spin_lock_irq(&priv->lock);
349
350 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
351 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
352 be16_to_cpu(path->pathrec.dlid),
353 path->pathrec.dgid.raw);
354 path->valid = 0;
355 }
356
357 spin_unlock_irq(&priv->lock);
358 }
359
360 void ipoib_flush_paths(struct net_device *dev)
361 {
362 struct ipoib_dev_priv *priv = netdev_priv(dev);
363 struct ipoib_path *path, *tp;
364 LIST_HEAD(remove_list);
365 unsigned long flags;
366
367 netif_tx_lock_bh(dev);
368 spin_lock_irqsave(&priv->lock, flags);
369
370 list_splice_init(&priv->path_list, &remove_list);
371
372 list_for_each_entry(path, &remove_list, list)
373 rb_erase(&path->rb_node, &priv->path_tree);
374
375 list_for_each_entry_safe(path, tp, &remove_list, list) {
376 if (path->query)
377 ib_sa_cancel_query(path->query_id, path->query);
378 spin_unlock_irqrestore(&priv->lock, flags);
379 netif_tx_unlock_bh(dev);
380 wait_for_completion(&path->done);
381 path_free(dev, path);
382 netif_tx_lock_bh(dev);
383 spin_lock_irqsave(&priv->lock, flags);
384 }
385
386 spin_unlock_irqrestore(&priv->lock, flags);
387 netif_tx_unlock_bh(dev);
388 }
389
390 static void path_rec_completion(int status,
391 struct ib_sa_path_rec *pathrec,
392 void *path_ptr)
393 {
394 struct ipoib_path *path = path_ptr;
395 struct net_device *dev = path->dev;
396 struct ipoib_dev_priv *priv = netdev_priv(dev);
397 struct ipoib_ah *ah = NULL;
398 struct ipoib_ah *old_ah = NULL;
399 struct ipoib_neigh *neigh, *tn;
400 struct sk_buff_head skqueue;
401 struct sk_buff *skb;
402 unsigned long flags;
403
404 if (!status)
405 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
406 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
407 else
408 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
409 status, path->pathrec.dgid.raw);
410
411 skb_queue_head_init(&skqueue);
412
413 if (!status) {
414 struct ib_ah_attr av;
415
416 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
417 ah = ipoib_create_ah(dev, priv->pd, &av);
418 }
419
420 spin_lock_irqsave(&priv->lock, flags);
421
422 if (!IS_ERR_OR_NULL(ah)) {
423 path->pathrec = *pathrec;
424
425 old_ah = path->ah;
426 path->ah = ah;
427
428 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
429 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
430
431 while ((skb = __skb_dequeue(&path->queue)))
432 __skb_queue_tail(&skqueue, skb);
433
434 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
435 if (neigh->ah) {
436 WARN_ON(neigh->ah != old_ah);
437 /*
438 * Dropping the ah reference inside
439 * priv->lock is safe here, because we
440 * will hold one more reference from
441 * the original value of path->ah (ie
442 * old_ah).
443 */
444 ipoib_put_ah(neigh->ah);
445 }
446 kref_get(&path->ah->ref);
447 neigh->ah = path->ah;
448
449 if (ipoib_cm_enabled(dev, neigh->daddr)) {
450 if (!ipoib_cm_get(neigh))
451 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
452 path,
453 neigh));
454 if (!ipoib_cm_get(neigh)) {
455 list_del(&neigh->list);
456 ipoib_neigh_free(neigh);
457 continue;
458 }
459 }
460
461 while ((skb = __skb_dequeue(&neigh->queue)))
462 __skb_queue_tail(&skqueue, skb);
463 }
464 path->valid = 1;
465 }
466
467 path->query = NULL;
468 complete(&path->done);
469
470 spin_unlock_irqrestore(&priv->lock, flags);
471
472 if (old_ah)
473 ipoib_put_ah(old_ah);
474
475 while ((skb = __skb_dequeue(&skqueue))) {
476 skb->dev = dev;
477 if (dev_queue_xmit(skb))
478 ipoib_warn(priv, "dev_queue_xmit failed "
479 "to requeue packet\n");
480 }
481 }
482
483 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
484 {
485 struct ipoib_dev_priv *priv = netdev_priv(dev);
486 struct ipoib_path *path;
487
488 if (!priv->broadcast)
489 return NULL;
490
491 path = kzalloc(sizeof *path, GFP_ATOMIC);
492 if (!path)
493 return NULL;
494
495 path->dev = dev;
496
497 skb_queue_head_init(&path->queue);
498
499 INIT_LIST_HEAD(&path->neigh_list);
500
501 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
502 path->pathrec.sgid = priv->local_gid;
503 path->pathrec.pkey = cpu_to_be16(priv->pkey);
504 path->pathrec.numb_path = 1;
505 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
506
507 return path;
508 }
509
510 static int path_rec_start(struct net_device *dev,
511 struct ipoib_path *path)
512 {
513 struct ipoib_dev_priv *priv = netdev_priv(dev);
514
515 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
516 path->pathrec.dgid.raw);
517
518 init_completion(&path->done);
519
520 path->query_id =
521 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
522 &path->pathrec,
523 IB_SA_PATH_REC_DGID |
524 IB_SA_PATH_REC_SGID |
525 IB_SA_PATH_REC_NUMB_PATH |
526 IB_SA_PATH_REC_TRAFFIC_CLASS |
527 IB_SA_PATH_REC_PKEY,
528 1000, GFP_ATOMIC,
529 path_rec_completion,
530 path, &path->query);
531 if (path->query_id < 0) {
532 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
533 path->query = NULL;
534 complete(&path->done);
535 return path->query_id;
536 }
537
538 return 0;
539 }
540
541 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
542 struct net_device *dev)
543 {
544 struct ipoib_dev_priv *priv = netdev_priv(dev);
545 struct ipoib_path *path;
546 struct ipoib_neigh *neigh;
547 unsigned long flags;
548
549 spin_lock_irqsave(&priv->lock, flags);
550 neigh = ipoib_neigh_alloc(daddr, dev);
551 if (!neigh) {
552 spin_unlock_irqrestore(&priv->lock, flags);
553 ++dev->stats.tx_dropped;
554 dev_kfree_skb_any(skb);
555 return;
556 }
557
558 path = __path_find(dev, daddr + 4);
559 if (!path) {
560 path = path_rec_create(dev, daddr + 4);
561 if (!path)
562 goto err_path;
563
564 __path_add(dev, path);
565 }
566
567 list_add_tail(&neigh->list, &path->neigh_list);
568
569 if (path->ah) {
570 kref_get(&path->ah->ref);
571 neigh->ah = path->ah;
572
573 if (ipoib_cm_enabled(dev, neigh->daddr)) {
574 if (!ipoib_cm_get(neigh))
575 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
576 if (!ipoib_cm_get(neigh)) {
577 list_del(&neigh->list);
578 ipoib_neigh_free(neigh);
579 goto err_drop;
580 }
581 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
582 __skb_queue_tail(&neigh->queue, skb);
583 else {
584 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
585 skb_queue_len(&neigh->queue));
586 goto err_drop;
587 }
588 } else {
589 spin_unlock_irqrestore(&priv->lock, flags);
590 ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
591 ipoib_neigh_put(neigh);
592 return;
593 }
594 } else {
595 neigh->ah = NULL;
596
597 if (!path->query && path_rec_start(dev, path))
598 goto err_list;
599
600 __skb_queue_tail(&neigh->queue, skb);
601 }
602
603 spin_unlock_irqrestore(&priv->lock, flags);
604 ipoib_neigh_put(neigh);
605 return;
606
607 err_list:
608 list_del(&neigh->list);
609
610 err_path:
611 ipoib_neigh_free(neigh);
612 err_drop:
613 ++dev->stats.tx_dropped;
614 dev_kfree_skb_any(skb);
615
616 spin_unlock_irqrestore(&priv->lock, flags);
617 ipoib_neigh_put(neigh);
618 }
619
620 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
621 struct ipoib_cb *cb)
622 {
623 struct ipoib_dev_priv *priv = netdev_priv(dev);
624 struct ipoib_path *path;
625 unsigned long flags;
626
627 spin_lock_irqsave(&priv->lock, flags);
628
629 path = __path_find(dev, cb->hwaddr + 4);
630 if (!path || !path->valid) {
631 int new_path = 0;
632
633 if (!path) {
634 path = path_rec_create(dev, cb->hwaddr + 4);
635 new_path = 1;
636 }
637 if (path) {
638 __skb_queue_tail(&path->queue, skb);
639
640 if (!path->query && path_rec_start(dev, path)) {
641 spin_unlock_irqrestore(&priv->lock, flags);
642 if (new_path)
643 path_free(dev, path);
644 return;
645 } else
646 __path_add(dev, path);
647 } else {
648 ++dev->stats.tx_dropped;
649 dev_kfree_skb_any(skb);
650 }
651
652 spin_unlock_irqrestore(&priv->lock, flags);
653 return;
654 }
655
656 if (path->ah) {
657 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
658 be16_to_cpu(path->pathrec.dlid));
659
660 spin_unlock_irqrestore(&priv->lock, flags);
661 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
662 return;
663 } else if ((path->query || !path_rec_start(dev, path)) &&
664 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
665 __skb_queue_tail(&path->queue, skb);
666 } else {
667 ++dev->stats.tx_dropped;
668 dev_kfree_skb_any(skb);
669 }
670
671 spin_unlock_irqrestore(&priv->lock, flags);
672 }
673
674 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
675 {
676 struct ipoib_dev_priv *priv = netdev_priv(dev);
677 struct ipoib_neigh *neigh;
678 struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
679 struct ipoib_header *header;
680 unsigned long flags;
681
682 header = (struct ipoib_header *) skb->data;
683
684 if (unlikely(cb->hwaddr[4] == 0xff)) {
685 /* multicast, arrange "if" according to probability */
686 if ((header->proto != htons(ETH_P_IP)) &&
687 (header->proto != htons(ETH_P_IPV6)) &&
688 (header->proto != htons(ETH_P_ARP)) &&
689 (header->proto != htons(ETH_P_RARP))) {
690 /* ethertype not supported by IPoIB */
691 ++dev->stats.tx_dropped;
692 dev_kfree_skb_any(skb);
693 return NETDEV_TX_OK;
694 }
695 /* Add in the P_Key for multicast*/
696 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
697 cb->hwaddr[9] = priv->pkey & 0xff;
698
699 neigh = ipoib_neigh_get(dev, cb->hwaddr);
700 if (likely(neigh))
701 goto send_using_neigh;
702 ipoib_mcast_send(dev, cb->hwaddr, skb);
703 return NETDEV_TX_OK;
704 }
705
706 /* unicast, arrange "switch" according to probability */
707 switch (header->proto) {
708 case htons(ETH_P_IP):
709 case htons(ETH_P_IPV6):
710 neigh = ipoib_neigh_get(dev, cb->hwaddr);
711 if (unlikely(!neigh)) {
712 neigh_add_path(skb, cb->hwaddr, dev);
713 return NETDEV_TX_OK;
714 }
715 break;
716 case htons(ETH_P_ARP):
717 case htons(ETH_P_RARP):
718 /* for unicast ARP and RARP should always perform path find */
719 unicast_arp_send(skb, dev, cb);
720 return NETDEV_TX_OK;
721 default:
722 /* ethertype not supported by IPoIB */
723 ++dev->stats.tx_dropped;
724 dev_kfree_skb_any(skb);
725 return NETDEV_TX_OK;
726 }
727
728 send_using_neigh:
729 /* note we now hold a ref to neigh */
730 if (ipoib_cm_get(neigh)) {
731 if (ipoib_cm_up(neigh)) {
732 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
733 goto unref;
734 }
735 } else if (neigh->ah) {
736 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
737 goto unref;
738 }
739
740 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
741 spin_lock_irqsave(&priv->lock, flags);
742 __skb_queue_tail(&neigh->queue, skb);
743 spin_unlock_irqrestore(&priv->lock, flags);
744 } else {
745 ++dev->stats.tx_dropped;
746 dev_kfree_skb_any(skb);
747 }
748
749 unref:
750 ipoib_neigh_put(neigh);
751
752 return NETDEV_TX_OK;
753 }
754
755 static void ipoib_timeout(struct net_device *dev)
756 {
757 struct ipoib_dev_priv *priv = netdev_priv(dev);
758
759 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
760 jiffies_to_msecs(jiffies - dev->trans_start));
761 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
762 netif_queue_stopped(dev),
763 priv->tx_head, priv->tx_tail);
764 /* XXX reset QP, etc. */
765 }
766
767 static int ipoib_hard_header(struct sk_buff *skb,
768 struct net_device *dev,
769 unsigned short type,
770 const void *daddr, const void *saddr, unsigned len)
771 {
772 struct ipoib_header *header;
773 struct ipoib_cb *cb = (struct ipoib_cb *) skb->cb;
774
775 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
776
777 header->proto = htons(type);
778 header->reserved = 0;
779
780 /*
781 * we don't rely on dst_entry structure, always stuff the
782 * destination address into skb->cb so we can figure out where
783 * to send the packet later.
784 */
785 memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
786
787 return 0;
788 }
789
790 static void ipoib_set_mcast_list(struct net_device *dev)
791 {
792 struct ipoib_dev_priv *priv = netdev_priv(dev);
793
794 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
795 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
796 return;
797 }
798
799 queue_work(ipoib_workqueue, &priv->restart_task);
800 }
801
802 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
803 {
804 /*
805 * Use only the address parts that contributes to spreading
806 * The subnet prefix is not used as one can not connect to
807 * same remote port (GUID) using the same remote QPN via two
808 * different subnets.
809 */
810 /* qpn octets[1:4) & port GUID octets[12:20) */
811 u32 *daddr_32 = (u32 *) daddr;
812 u32 hv;
813
814 hv = jhash_3words(daddr_32[3], daddr_32[4], 0xFFFFFF & daddr_32[0], 0);
815 return hv & htbl->mask;
816 }
817
818 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
819 {
820 struct ipoib_dev_priv *priv = netdev_priv(dev);
821 struct ipoib_neigh_table *ntbl = &priv->ntbl;
822 struct ipoib_neigh_hash *htbl;
823 struct ipoib_neigh *neigh = NULL;
824 u32 hash_val;
825
826 rcu_read_lock_bh();
827
828 htbl = rcu_dereference_bh(ntbl->htbl);
829
830 if (!htbl)
831 goto out_unlock;
832
833 hash_val = ipoib_addr_hash(htbl, daddr);
834 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
835 neigh != NULL;
836 neigh = rcu_dereference_bh(neigh->hnext)) {
837 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
838 /* found, take one ref on behalf of the caller */
839 if (!atomic_inc_not_zero(&neigh->refcnt)) {
840 /* deleted */
841 neigh = NULL;
842 goto out_unlock;
843 }
844 neigh->alive = jiffies;
845 goto out_unlock;
846 }
847 }
848
849 out_unlock:
850 rcu_read_unlock_bh();
851 return neigh;
852 }
853
854 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
855 {
856 struct ipoib_neigh_table *ntbl = &priv->ntbl;
857 struct ipoib_neigh_hash *htbl;
858 unsigned long neigh_obsolete;
859 unsigned long dt;
860 unsigned long flags;
861 int i;
862
863 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
864 return;
865
866 spin_lock_irqsave(&priv->lock, flags);
867
868 htbl = rcu_dereference_protected(ntbl->htbl,
869 lockdep_is_held(&priv->lock));
870
871 if (!htbl)
872 goto out_unlock;
873
874 /* neigh is obsolete if it was idle for two GC periods */
875 dt = 2 * arp_tbl.gc_interval;
876 neigh_obsolete = jiffies - dt;
877 /* handle possible race condition */
878 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
879 goto out_unlock;
880
881 for (i = 0; i < htbl->size; i++) {
882 struct ipoib_neigh *neigh;
883 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
884
885 while ((neigh = rcu_dereference_protected(*np,
886 lockdep_is_held(&priv->lock))) != NULL) {
887 /* was the neigh idle for two GC periods */
888 if (time_after(neigh_obsolete, neigh->alive)) {
889 rcu_assign_pointer(*np,
890 rcu_dereference_protected(neigh->hnext,
891 lockdep_is_held(&priv->lock)));
892 /* remove from path/mc list */
893 list_del(&neigh->list);
894 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
895 } else {
896 np = &neigh->hnext;
897 }
898
899 }
900 }
901
902 out_unlock:
903 spin_unlock_irqrestore(&priv->lock, flags);
904 }
905
906 static void ipoib_reap_neigh(struct work_struct *work)
907 {
908 struct ipoib_dev_priv *priv =
909 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
910
911 __ipoib_reap_neigh(priv);
912
913 if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
914 queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
915 arp_tbl.gc_interval);
916 }
917
918
919 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
920 struct net_device *dev)
921 {
922 struct ipoib_neigh *neigh;
923
924 neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
925 if (!neigh)
926 return NULL;
927
928 neigh->dev = dev;
929 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
930 skb_queue_head_init(&neigh->queue);
931 INIT_LIST_HEAD(&neigh->list);
932 ipoib_cm_set(neigh, NULL);
933 /* one ref on behalf of the caller */
934 atomic_set(&neigh->refcnt, 1);
935
936 return neigh;
937 }
938
939 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
940 struct net_device *dev)
941 {
942 struct ipoib_dev_priv *priv = netdev_priv(dev);
943 struct ipoib_neigh_table *ntbl = &priv->ntbl;
944 struct ipoib_neigh_hash *htbl;
945 struct ipoib_neigh *neigh;
946 u32 hash_val;
947
948 htbl = rcu_dereference_protected(ntbl->htbl,
949 lockdep_is_held(&priv->lock));
950 if (!htbl) {
951 neigh = NULL;
952 goto out_unlock;
953 }
954
955 /* need to add a new neigh, but maybe some other thread succeeded?
956 * recalc hash, maybe hash resize took place so we do a search
957 */
958 hash_val = ipoib_addr_hash(htbl, daddr);
959 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
960 lockdep_is_held(&priv->lock));
961 neigh != NULL;
962 neigh = rcu_dereference_protected(neigh->hnext,
963 lockdep_is_held(&priv->lock))) {
964 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
965 /* found, take one ref on behalf of the caller */
966 if (!atomic_inc_not_zero(&neigh->refcnt)) {
967 /* deleted */
968 neigh = NULL;
969 break;
970 }
971 neigh->alive = jiffies;
972 goto out_unlock;
973 }
974 }
975
976 neigh = ipoib_neigh_ctor(daddr, dev);
977 if (!neigh)
978 goto out_unlock;
979
980 /* one ref on behalf of the hash table */
981 atomic_inc(&neigh->refcnt);
982 neigh->alive = jiffies;
983 /* put in hash */
984 rcu_assign_pointer(neigh->hnext,
985 rcu_dereference_protected(htbl->buckets[hash_val],
986 lockdep_is_held(&priv->lock)));
987 rcu_assign_pointer(htbl->buckets[hash_val], neigh);
988 atomic_inc(&ntbl->entries);
989
990 out_unlock:
991
992 return neigh;
993 }
994
995 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
996 {
997 /* neigh reference count was dropprd to zero */
998 struct net_device *dev = neigh->dev;
999 struct ipoib_dev_priv *priv = netdev_priv(dev);
1000 struct sk_buff *skb;
1001 if (neigh->ah)
1002 ipoib_put_ah(neigh->ah);
1003 while ((skb = __skb_dequeue(&neigh->queue))) {
1004 ++dev->stats.tx_dropped;
1005 dev_kfree_skb_any(skb);
1006 }
1007 if (ipoib_cm_get(neigh))
1008 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1009 ipoib_dbg(netdev_priv(dev),
1010 "neigh free for %06x %pI6\n",
1011 IPOIB_QPN(neigh->daddr),
1012 neigh->daddr + 4);
1013 kfree(neigh);
1014 if (atomic_dec_and_test(&priv->ntbl.entries)) {
1015 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1016 complete(&priv->ntbl.flushed);
1017 }
1018 }
1019
1020 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1021 {
1022 /* Called as a result of removal from hash table */
1023 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1024 /* note TX context may hold another ref */
1025 ipoib_neigh_put(neigh);
1026 }
1027
1028 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1029 {
1030 struct net_device *dev = neigh->dev;
1031 struct ipoib_dev_priv *priv = netdev_priv(dev);
1032 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1033 struct ipoib_neigh_hash *htbl;
1034 struct ipoib_neigh __rcu **np;
1035 struct ipoib_neigh *n;
1036 u32 hash_val;
1037
1038 htbl = rcu_dereference_protected(ntbl->htbl,
1039 lockdep_is_held(&priv->lock));
1040 if (!htbl)
1041 return;
1042
1043 hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1044 np = &htbl->buckets[hash_val];
1045 for (n = rcu_dereference_protected(*np,
1046 lockdep_is_held(&priv->lock));
1047 n != NULL;
1048 n = rcu_dereference_protected(*np,
1049 lockdep_is_held(&priv->lock))) {
1050 if (n == neigh) {
1051 /* found */
1052 rcu_assign_pointer(*np,
1053 rcu_dereference_protected(neigh->hnext,
1054 lockdep_is_held(&priv->lock)));
1055 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1056 return;
1057 } else {
1058 np = &n->hnext;
1059 }
1060 }
1061 }
1062
1063 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1064 {
1065 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1066 struct ipoib_neigh_hash *htbl;
1067 struct ipoib_neigh **buckets;
1068 u32 size;
1069
1070 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1071 ntbl->htbl = NULL;
1072 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1073 if (!htbl)
1074 return -ENOMEM;
1075 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1076 size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1077 buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1078 if (!buckets) {
1079 kfree(htbl);
1080 return -ENOMEM;
1081 }
1082 htbl->size = size;
1083 htbl->mask = (size - 1);
1084 htbl->buckets = buckets;
1085 ntbl->htbl = htbl;
1086 htbl->ntbl = ntbl;
1087 atomic_set(&ntbl->entries, 0);
1088
1089 /* start garbage collection */
1090 clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1091 queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
1092 arp_tbl.gc_interval);
1093
1094 return 0;
1095 }
1096
1097 static void neigh_hash_free_rcu(struct rcu_head *head)
1098 {
1099 struct ipoib_neigh_hash *htbl = container_of(head,
1100 struct ipoib_neigh_hash,
1101 rcu);
1102 struct ipoib_neigh __rcu **buckets = htbl->buckets;
1103 struct ipoib_neigh_table *ntbl = htbl->ntbl;
1104
1105 kfree(buckets);
1106 kfree(htbl);
1107 complete(&ntbl->deleted);
1108 }
1109
1110 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1111 {
1112 struct ipoib_dev_priv *priv = netdev_priv(dev);
1113 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1114 struct ipoib_neigh_hash *htbl;
1115 unsigned long flags;
1116 int i;
1117
1118 /* remove all neigh connected to a given path or mcast */
1119 spin_lock_irqsave(&priv->lock, flags);
1120
1121 htbl = rcu_dereference_protected(ntbl->htbl,
1122 lockdep_is_held(&priv->lock));
1123
1124 if (!htbl)
1125 goto out_unlock;
1126
1127 for (i = 0; i < htbl->size; i++) {
1128 struct ipoib_neigh *neigh;
1129 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1130
1131 while ((neigh = rcu_dereference_protected(*np,
1132 lockdep_is_held(&priv->lock))) != NULL) {
1133 /* delete neighs belong to this parent */
1134 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1135 rcu_assign_pointer(*np,
1136 rcu_dereference_protected(neigh->hnext,
1137 lockdep_is_held(&priv->lock)));
1138 /* remove from parent list */
1139 list_del(&neigh->list);
1140 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1141 } else {
1142 np = &neigh->hnext;
1143 }
1144
1145 }
1146 }
1147 out_unlock:
1148 spin_unlock_irqrestore(&priv->lock, flags);
1149 }
1150
1151 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1152 {
1153 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1154 struct ipoib_neigh_hash *htbl;
1155 unsigned long flags;
1156 int i, wait_flushed = 0;
1157
1158 init_completion(&priv->ntbl.flushed);
1159
1160 spin_lock_irqsave(&priv->lock, flags);
1161
1162 htbl = rcu_dereference_protected(ntbl->htbl,
1163 lockdep_is_held(&priv->lock));
1164 if (!htbl)
1165 goto out_unlock;
1166
1167 wait_flushed = atomic_read(&priv->ntbl.entries);
1168 if (!wait_flushed)
1169 goto free_htbl;
1170
1171 for (i = 0; i < htbl->size; i++) {
1172 struct ipoib_neigh *neigh;
1173 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1174
1175 while ((neigh = rcu_dereference_protected(*np,
1176 lockdep_is_held(&priv->lock))) != NULL) {
1177 rcu_assign_pointer(*np,
1178 rcu_dereference_protected(neigh->hnext,
1179 lockdep_is_held(&priv->lock)));
1180 /* remove from path/mc list */
1181 list_del(&neigh->list);
1182 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1183 }
1184 }
1185
1186 free_htbl:
1187 rcu_assign_pointer(ntbl->htbl, NULL);
1188 call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1189
1190 out_unlock:
1191 spin_unlock_irqrestore(&priv->lock, flags);
1192 if (wait_flushed)
1193 wait_for_completion(&priv->ntbl.flushed);
1194 }
1195
1196 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1197 {
1198 struct ipoib_dev_priv *priv = netdev_priv(dev);
1199 int stopped;
1200
1201 ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1202 init_completion(&priv->ntbl.deleted);
1203 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1204
1205 /* Stop GC if called at init fail need to cancel work */
1206 stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1207 if (!stopped)
1208 cancel_delayed_work(&priv->neigh_reap_task);
1209
1210 ipoib_flush_neighs(priv);
1211
1212 wait_for_completion(&priv->ntbl.deleted);
1213 }
1214
1215
1216 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1217 {
1218 struct ipoib_dev_priv *priv = netdev_priv(dev);
1219
1220 if (ipoib_neigh_hash_init(priv) < 0)
1221 goto out;
1222 /* Allocate RX/TX "rings" to hold queued skbs */
1223 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1224 GFP_KERNEL);
1225 if (!priv->rx_ring) {
1226 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
1227 ca->name, ipoib_recvq_size);
1228 goto out_neigh_hash_cleanup;
1229 }
1230
1231 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1232 if (!priv->tx_ring) {
1233 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1234 ca->name, ipoib_sendq_size);
1235 goto out_rx_ring_cleanup;
1236 }
1237
1238 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1239
1240 if (ipoib_ib_dev_init(dev, ca, port))
1241 goto out_tx_ring_cleanup;
1242
1243 return 0;
1244
1245 out_tx_ring_cleanup:
1246 vfree(priv->tx_ring);
1247
1248 out_rx_ring_cleanup:
1249 kfree(priv->rx_ring);
1250
1251 out_neigh_hash_cleanup:
1252 ipoib_neigh_hash_uninit(dev);
1253 out:
1254 return -ENOMEM;
1255 }
1256
1257 void ipoib_dev_cleanup(struct net_device *dev)
1258 {
1259 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1260
1261 ipoib_delete_debug_files(dev);
1262
1263 /* Delete any child interfaces first */
1264 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1265 /* Stop GC on child */
1266 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1267 cancel_delayed_work(&cpriv->neigh_reap_task);
1268 unregister_netdev(cpriv->dev);
1269 ipoib_dev_cleanup(cpriv->dev);
1270 free_netdev(cpriv->dev);
1271 }
1272
1273 ipoib_ib_dev_cleanup(dev);
1274
1275 kfree(priv->rx_ring);
1276 vfree(priv->tx_ring);
1277
1278 priv->rx_ring = NULL;
1279 priv->tx_ring = NULL;
1280
1281 ipoib_neigh_hash_uninit(dev);
1282 }
1283
1284 static const struct header_ops ipoib_header_ops = {
1285 .create = ipoib_hard_header,
1286 };
1287
1288 static const struct net_device_ops ipoib_netdev_ops = {
1289 .ndo_open = ipoib_open,
1290 .ndo_stop = ipoib_stop,
1291 .ndo_change_mtu = ipoib_change_mtu,
1292 .ndo_fix_features = ipoib_fix_features,
1293 .ndo_start_xmit = ipoib_start_xmit,
1294 .ndo_tx_timeout = ipoib_timeout,
1295 .ndo_set_rx_mode = ipoib_set_mcast_list,
1296 };
1297
1298 static void ipoib_setup(struct net_device *dev)
1299 {
1300 struct ipoib_dev_priv *priv = netdev_priv(dev);
1301
1302 dev->netdev_ops = &ipoib_netdev_ops;
1303 dev->header_ops = &ipoib_header_ops;
1304
1305 ipoib_set_ethtool_ops(dev);
1306
1307 netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1308
1309 dev->watchdog_timeo = HZ;
1310
1311 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
1312
1313 dev->hard_header_len = IPOIB_ENCAP_LEN;
1314 dev->addr_len = INFINIBAND_ALEN;
1315 dev->type = ARPHRD_INFINIBAND;
1316 dev->tx_queue_len = ipoib_sendq_size * 2;
1317 dev->features = (NETIF_F_VLAN_CHALLENGED |
1318 NETIF_F_HIGHDMA);
1319 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1320
1321 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1322
1323 netif_carrier_off(dev);
1324
1325 priv->dev = dev;
1326
1327 spin_lock_init(&priv->lock);
1328
1329 mutex_init(&priv->vlan_mutex);
1330
1331 INIT_LIST_HEAD(&priv->path_list);
1332 INIT_LIST_HEAD(&priv->child_intfs);
1333 INIT_LIST_HEAD(&priv->dead_ahs);
1334 INIT_LIST_HEAD(&priv->multicast_list);
1335
1336 INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1337 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1338 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1339 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
1340 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
1341 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
1342 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1343 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1344 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1345 }
1346
1347 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1348 {
1349 struct net_device *dev;
1350
1351 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1352 ipoib_setup);
1353 if (!dev)
1354 return NULL;
1355
1356 return netdev_priv(dev);
1357 }
1358
1359 static ssize_t show_pkey(struct device *dev,
1360 struct device_attribute *attr, char *buf)
1361 {
1362 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1363
1364 return sprintf(buf, "0x%04x\n", priv->pkey);
1365 }
1366 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1367
1368 static ssize_t show_umcast(struct device *dev,
1369 struct device_attribute *attr, char *buf)
1370 {
1371 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1372
1373 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1374 }
1375
1376 static ssize_t set_umcast(struct device *dev,
1377 struct device_attribute *attr,
1378 const char *buf, size_t count)
1379 {
1380 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1381 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1382
1383 if (umcast_val > 0) {
1384 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1385 ipoib_warn(priv, "ignoring multicast groups joined directly "
1386 "by userspace\n");
1387 } else
1388 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1389
1390 return count;
1391 }
1392 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1393
1394 int ipoib_add_umcast_attr(struct net_device *dev)
1395 {
1396 return device_create_file(&dev->dev, &dev_attr_umcast);
1397 }
1398
1399 static ssize_t create_child(struct device *dev,
1400 struct device_attribute *attr,
1401 const char *buf, size_t count)
1402 {
1403 int pkey;
1404 int ret;
1405
1406 if (sscanf(buf, "%i", &pkey) != 1)
1407 return -EINVAL;
1408
1409 if (pkey < 0 || pkey > 0xffff)
1410 return -EINVAL;
1411
1412 /*
1413 * Set the full membership bit, so that we join the right
1414 * broadcast group, etc.
1415 */
1416 pkey |= 0x8000;
1417
1418 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1419
1420 return ret ? ret : count;
1421 }
1422 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1423
1424 static ssize_t delete_child(struct device *dev,
1425 struct device_attribute *attr,
1426 const char *buf, size_t count)
1427 {
1428 int pkey;
1429 int ret;
1430
1431 if (sscanf(buf, "%i", &pkey) != 1)
1432 return -EINVAL;
1433
1434 if (pkey < 0 || pkey > 0xffff)
1435 return -EINVAL;
1436
1437 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1438
1439 return ret ? ret : count;
1440
1441 }
1442 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1443
1444 int ipoib_add_pkey_attr(struct net_device *dev)
1445 {
1446 return device_create_file(&dev->dev, &dev_attr_pkey);
1447 }
1448
1449 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1450 {
1451 struct ib_device_attr *device_attr;
1452 int result = -ENOMEM;
1453
1454 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1455 if (!device_attr) {
1456 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1457 hca->name, sizeof *device_attr);
1458 return result;
1459 }
1460
1461 result = ib_query_device(hca, device_attr);
1462 if (result) {
1463 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1464 hca->name, result);
1465 kfree(device_attr);
1466 return result;
1467 }
1468 priv->hca_caps = device_attr->device_cap_flags;
1469
1470 kfree(device_attr);
1471
1472 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1473 priv->dev->hw_features = NETIF_F_SG |
1474 NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1475
1476 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1477 priv->dev->hw_features |= NETIF_F_TSO;
1478
1479 priv->dev->features |= priv->dev->hw_features;
1480 }
1481
1482 return 0;
1483 }
1484
1485 static struct net_device *ipoib_add_port(const char *format,
1486 struct ib_device *hca, u8 port)
1487 {
1488 struct ipoib_dev_priv *priv;
1489 struct ib_port_attr attr;
1490 int result = -ENOMEM;
1491
1492 priv = ipoib_intf_alloc(format);
1493 if (!priv)
1494 goto alloc_mem_failed;
1495
1496 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1497 priv->dev->dev_id = port - 1;
1498
1499 if (!ib_query_port(hca, port, &attr))
1500 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1501 else {
1502 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1503 hca->name, port);
1504 goto device_init_failed;
1505 }
1506
1507 /* MTU will be reset when mcast join happens */
1508 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1509 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
1510
1511 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1512
1513 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1514 if (result) {
1515 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1516 hca->name, port, result);
1517 goto device_init_failed;
1518 }
1519
1520 if (ipoib_set_dev_features(priv, hca))
1521 goto device_init_failed;
1522
1523 /*
1524 * Set the full membership bit, so that we join the right
1525 * broadcast group, etc.
1526 */
1527 priv->pkey |= 0x8000;
1528
1529 priv->dev->broadcast[8] = priv->pkey >> 8;
1530 priv->dev->broadcast[9] = priv->pkey & 0xff;
1531
1532 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1533 if (result) {
1534 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1535 hca->name, port, result);
1536 goto device_init_failed;
1537 } else
1538 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1539
1540 result = ipoib_dev_init(priv->dev, hca, port);
1541 if (result < 0) {
1542 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1543 hca->name, port, result);
1544 goto device_init_failed;
1545 }
1546
1547 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1548 priv->ca, ipoib_event);
1549 result = ib_register_event_handler(&priv->event_handler);
1550 if (result < 0) {
1551 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1552 "port %d (ret = %d)\n",
1553 hca->name, port, result);
1554 goto event_failed;
1555 }
1556
1557 result = register_netdev(priv->dev);
1558 if (result) {
1559 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1560 hca->name, port, result);
1561 goto register_failed;
1562 }
1563
1564 ipoib_create_debug_files(priv->dev);
1565
1566 if (ipoib_cm_add_mode_attr(priv->dev))
1567 goto sysfs_failed;
1568 if (ipoib_add_pkey_attr(priv->dev))
1569 goto sysfs_failed;
1570 if (ipoib_add_umcast_attr(priv->dev))
1571 goto sysfs_failed;
1572 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1573 goto sysfs_failed;
1574 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1575 goto sysfs_failed;
1576
1577 return priv->dev;
1578
1579 sysfs_failed:
1580 ipoib_delete_debug_files(priv->dev);
1581 unregister_netdev(priv->dev);
1582
1583 register_failed:
1584 ib_unregister_event_handler(&priv->event_handler);
1585 /* Stop GC if started before flush */
1586 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1587 cancel_delayed_work(&priv->neigh_reap_task);
1588 flush_workqueue(ipoib_workqueue);
1589
1590 event_failed:
1591 ipoib_dev_cleanup(priv->dev);
1592
1593 device_init_failed:
1594 free_netdev(priv->dev);
1595
1596 alloc_mem_failed:
1597 return ERR_PTR(result);
1598 }
1599
1600 static void ipoib_add_one(struct ib_device *device)
1601 {
1602 struct list_head *dev_list;
1603 struct net_device *dev;
1604 struct ipoib_dev_priv *priv;
1605 int s, e, p;
1606
1607 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1608 return;
1609
1610 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1611 if (!dev_list)
1612 return;
1613
1614 INIT_LIST_HEAD(dev_list);
1615
1616 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1617 s = 0;
1618 e = 0;
1619 } else {
1620 s = 1;
1621 e = device->phys_port_cnt;
1622 }
1623
1624 for (p = s; p <= e; ++p) {
1625 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1626 continue;
1627 dev = ipoib_add_port("ib%d", device, p);
1628 if (!IS_ERR(dev)) {
1629 priv = netdev_priv(dev);
1630 list_add_tail(&priv->list, dev_list);
1631 }
1632 }
1633
1634 ib_set_client_data(device, &ipoib_client, dev_list);
1635 }
1636
1637 static void ipoib_remove_one(struct ib_device *device)
1638 {
1639 struct ipoib_dev_priv *priv, *tmp;
1640 struct list_head *dev_list;
1641
1642 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1643 return;
1644
1645 dev_list = ib_get_client_data(device, &ipoib_client);
1646
1647 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1648 ib_unregister_event_handler(&priv->event_handler);
1649
1650 rtnl_lock();
1651 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1652 rtnl_unlock();
1653
1654 /* Stop GC */
1655 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1656 cancel_delayed_work(&priv->neigh_reap_task);
1657 flush_workqueue(ipoib_workqueue);
1658
1659 unregister_netdev(priv->dev);
1660 ipoib_dev_cleanup(priv->dev);
1661 free_netdev(priv->dev);
1662 }
1663
1664 kfree(dev_list);
1665 }
1666
1667 static int __init ipoib_init_module(void)
1668 {
1669 int ret;
1670
1671 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1672 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1673 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1674
1675 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1676 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1677 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1678 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1679 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1680 #endif
1681
1682 /*
1683 * When copying small received packets, we only copy from the
1684 * linear data part of the SKB, so we rely on this condition.
1685 */
1686 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1687
1688 ret = ipoib_register_debugfs();
1689 if (ret)
1690 return ret;
1691
1692 /*
1693 * We create our own workqueue mainly because we want to be
1694 * able to flush it when devices are being removed. We can't
1695 * use schedule_work()/flush_scheduled_work() because both
1696 * unregister_netdev() and linkwatch_event take the rtnl lock,
1697 * so flush_scheduled_work() can deadlock during device
1698 * removal.
1699 */
1700 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1701 if (!ipoib_workqueue) {
1702 ret = -ENOMEM;
1703 goto err_fs;
1704 }
1705
1706 ib_sa_register_client(&ipoib_sa_client);
1707
1708 ret = ib_register_client(&ipoib_client);
1709 if (ret)
1710 goto err_sa;
1711
1712 return 0;
1713
1714 err_sa:
1715 ib_sa_unregister_client(&ipoib_sa_client);
1716 destroy_workqueue(ipoib_workqueue);
1717
1718 err_fs:
1719 ipoib_unregister_debugfs();
1720
1721 return ret;
1722 }
1723
1724 static void __exit ipoib_cleanup_module(void)
1725 {
1726 ib_unregister_client(&ipoib_client);
1727 ib_sa_unregister_client(&ipoib_sa_client);
1728 ipoib_unregister_debugfs();
1729 destroy_workqueue(ipoib_workqueue);
1730 }
1731
1732 module_init(ipoib_init_module);
1733 module_exit(ipoib_cleanup_module);
Linux kernel - Deliverables
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