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 <net/dst.h>
50
51 MODULE_AUTHOR("Roland Dreier");
52 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
53 MODULE_LICENSE("Dual BSD/GPL");
54
55 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
56 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
57
58 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
59 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
60 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
61 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
62
63 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
64 int ipoib_debug_level;
65
66 module_param_named(debug_level, ipoib_debug_level, int, 0644);
67 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
68 #endif
69
70 struct ipoib_path_iter {
71 struct net_device *dev;
72 struct ipoib_path path;
73 };
74
75 static const u8 ipv4_bcast_addr[] = {
76 0x00, 0xff, 0xff, 0xff,
77 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
78 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
79 };
80
81 struct workqueue_struct *ipoib_workqueue;
82
83 struct ib_sa_client ipoib_sa_client;
84
85 static void ipoib_add_one(struct ib_device *device);
86 static void ipoib_remove_one(struct ib_device *device);
87
88 static struct ib_client ipoib_client = {
89 .name = "ipoib",
90 .add = ipoib_add_one,
91 .remove = ipoib_remove_one
92 };
93
ipoib_open(struct net_device * dev)94 int ipoib_open(struct net_device *dev)
95 {
96 struct ipoib_dev_priv *priv = netdev_priv(dev);
97
98 ipoib_dbg(priv, "bringing up interface\n");
99
100 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
101
102 if (ipoib_pkey_dev_delay_open(dev))
103 return 0;
104
105 if (ipoib_ib_dev_open(dev))
106 goto err_disable;
107
108 if (ipoib_ib_dev_up(dev))
109 goto err_stop;
110
111 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
112 struct ipoib_dev_priv *cpriv;
113
114 /* Bring up any child interfaces too */
115 mutex_lock(&priv->vlan_mutex);
116 list_for_each_entry(cpriv, &priv->child_intfs, list) {
117 int flags;
118
119 flags = cpriv->dev->flags;
120 if (flags & IFF_UP)
121 continue;
122
123 dev_change_flags(cpriv->dev, flags | IFF_UP);
124 }
125 mutex_unlock(&priv->vlan_mutex);
126 }
127
128 netif_start_queue(dev);
129
130 return 0;
131
132 err_stop:
133 ipoib_ib_dev_stop(dev, 1);
134
135 err_disable:
136 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
137
138 return -EINVAL;
139 }
140
ipoib_stop(struct net_device * dev)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
149 netif_stop_queue(dev);
150
151 ipoib_ib_dev_down(dev, 0);
152 ipoib_ib_dev_stop(dev, 0);
153
154 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
155 struct ipoib_dev_priv *cpriv;
156
157 /* Bring down any child interfaces too */
158 mutex_lock(&priv->vlan_mutex);
159 list_for_each_entry(cpriv, &priv->child_intfs, list) {
160 int flags;
161
162 flags = cpriv->dev->flags;
163 if (!(flags & IFF_UP))
164 continue;
165
166 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
167 }
168 mutex_unlock(&priv->vlan_mutex);
169 }
170
171 return 0;
172 }
173
ipoib_change_mtu(struct net_device * dev,int new_mtu)174 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
175 {
176 struct ipoib_dev_priv *priv = netdev_priv(dev);
177
178 /* dev->mtu > 2K ==> connected mode */
179 if (ipoib_cm_admin_enabled(dev)) {
180 if (new_mtu > ipoib_cm_max_mtu(dev))
181 return -EINVAL;
182
183 if (new_mtu > priv->mcast_mtu)
184 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
185 priv->mcast_mtu);
186
187 dev->mtu = new_mtu;
188 return 0;
189 }
190
191 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
192 return -EINVAL;
193
194 priv->admin_mtu = new_mtu;
195
196 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
197
198 return 0;
199 }
200
__path_find(struct net_device * dev,void * gid)201 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
202 {
203 struct ipoib_dev_priv *priv = netdev_priv(dev);
204 struct rb_node *n = priv->path_tree.rb_node;
205 struct ipoib_path *path;
206 int ret;
207
208 while (n) {
209 path = rb_entry(n, struct ipoib_path, rb_node);
210
211 ret = memcmp(gid, path->pathrec.dgid.raw,
212 sizeof (union ib_gid));
213
214 if (ret < 0)
215 n = n->rb_left;
216 else if (ret > 0)
217 n = n->rb_right;
218 else
219 return path;
220 }
221
222 return NULL;
223 }
224
__path_add(struct net_device * dev,struct ipoib_path * path)225 static int __path_add(struct net_device *dev, struct ipoib_path *path)
226 {
227 struct ipoib_dev_priv *priv = netdev_priv(dev);
228 struct rb_node **n = &priv->path_tree.rb_node;
229 struct rb_node *pn = NULL;
230 struct ipoib_path *tpath;
231 int ret;
232
233 while (*n) {
234 pn = *n;
235 tpath = rb_entry(pn, struct ipoib_path, rb_node);
236
237 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
238 sizeof (union ib_gid));
239 if (ret < 0)
240 n = &pn->rb_left;
241 else if (ret > 0)
242 n = &pn->rb_right;
243 else
244 return -EEXIST;
245 }
246
247 rb_link_node(&path->rb_node, pn, n);
248 rb_insert_color(&path->rb_node, &priv->path_tree);
249
250 list_add_tail(&path->list, &priv->path_list);
251
252 return 0;
253 }
254
path_free(struct net_device * dev,struct ipoib_path * path)255 static void path_free(struct net_device *dev, struct ipoib_path *path)
256 {
257 struct ipoib_dev_priv *priv = netdev_priv(dev);
258 struct ipoib_neigh *neigh, *tn;
259 struct sk_buff *skb;
260 unsigned long flags;
261
262 while ((skb = __skb_dequeue(&path->queue)))
263 dev_kfree_skb_irq(skb);
264
265 spin_lock_irqsave(&priv->lock, flags);
266
267 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
268 /*
269 * It's safe to call ipoib_put_ah() inside priv->lock
270 * here, because we know that path->ah will always
271 * hold one more reference, so ipoib_put_ah() will
272 * never do more than decrement the ref count.
273 */
274 if (neigh->ah)
275 ipoib_put_ah(neigh->ah);
276
277 ipoib_neigh_free(dev, neigh);
278 }
279
280 spin_unlock_irqrestore(&priv->lock, flags);
281
282 if (path->ah)
283 ipoib_put_ah(path->ah);
284
285 kfree(path);
286 }
287
288 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
289
ipoib_path_iter_init(struct net_device * dev)290 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
291 {
292 struct ipoib_path_iter *iter;
293
294 iter = kmalloc(sizeof *iter, GFP_KERNEL);
295 if (!iter)
296 return NULL;
297
298 iter->dev = dev;
299 memset(iter->path.pathrec.dgid.raw, 0, 16);
300
301 if (ipoib_path_iter_next(iter)) {
302 kfree(iter);
303 return NULL;
304 }
305
306 return iter;
307 }
308
ipoib_path_iter_next(struct ipoib_path_iter * iter)309 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
310 {
311 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
312 struct rb_node *n;
313 struct ipoib_path *path;
314 int ret = 1;
315
316 spin_lock_irq(&priv->lock);
317
318 n = rb_first(&priv->path_tree);
319
320 while (n) {
321 path = rb_entry(n, struct ipoib_path, rb_node);
322
323 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
324 sizeof (union ib_gid)) < 0) {
325 iter->path = *path;
326 ret = 0;
327 break;
328 }
329
330 n = rb_next(n);
331 }
332
333 spin_unlock_irq(&priv->lock);
334
335 return ret;
336 }
337
ipoib_path_iter_read(struct ipoib_path_iter * iter,struct ipoib_path * path)338 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
339 struct ipoib_path *path)
340 {
341 *path = iter->path;
342 }
343
344 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
345
ipoib_mark_paths_invalid(struct net_device * dev)346 void ipoib_mark_paths_invalid(struct net_device *dev)
347 {
348 struct ipoib_dev_priv *priv = netdev_priv(dev);
349 struct ipoib_path *path, *tp;
350
351 spin_lock_irq(&priv->lock);
352
353 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
354 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
355 be16_to_cpu(path->pathrec.dlid),
356 path->pathrec.dgid.raw);
357 path->valid = 0;
358 }
359
360 spin_unlock_irq(&priv->lock);
361 }
362
ipoib_flush_paths(struct net_device * dev)363 void ipoib_flush_paths(struct net_device *dev)
364 {
365 struct ipoib_dev_priv *priv = netdev_priv(dev);
366 struct ipoib_path *path, *tp;
367 LIST_HEAD(remove_list);
368 unsigned long flags;
369
370 netif_tx_lock_bh(dev);
371 spin_lock_irqsave(&priv->lock, flags);
372
373 list_splice_init(&priv->path_list, &remove_list);
374
375 list_for_each_entry(path, &remove_list, list)
376 rb_erase(&path->rb_node, &priv->path_tree);
377
378 list_for_each_entry_safe(path, tp, &remove_list, list) {
379 if (path->query)
380 ib_sa_cancel_query(path->query_id, path->query);
381 spin_unlock_irqrestore(&priv->lock, flags);
382 netif_tx_unlock_bh(dev);
383 wait_for_completion(&path->done);
384 path_free(dev, path);
385 netif_tx_lock_bh(dev);
386 spin_lock_irqsave(&priv->lock, flags);
387 }
388
389 spin_unlock_irqrestore(&priv->lock, flags);
390 netif_tx_unlock_bh(dev);
391 }
392
path_rec_completion(int status,struct ib_sa_path_rec * pathrec,void * path_ptr)393 static void path_rec_completion(int status,
394 struct ib_sa_path_rec *pathrec,
395 void *path_ptr)
396 {
397 struct ipoib_path *path = path_ptr;
398 struct net_device *dev = path->dev;
399 struct ipoib_dev_priv *priv = netdev_priv(dev);
400 struct ipoib_ah *ah = NULL;
401 struct ipoib_ah *old_ah = NULL;
402 struct ipoib_neigh *neigh, *tn;
403 struct sk_buff_head skqueue;
404 struct sk_buff *skb;
405 unsigned long flags;
406
407 if (!status)
408 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
409 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
410 else
411 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
412 status, path->pathrec.dgid.raw);
413
414 skb_queue_head_init(&skqueue);
415
416 if (!status) {
417 struct ib_ah_attr av;
418
419 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
420 ah = ipoib_create_ah(dev, priv->pd, &av);
421 }
422
423 spin_lock_irqsave(&priv->lock, flags);
424
425 if (ah) {
426 path->pathrec = *pathrec;
427
428 old_ah = path->ah;
429 path->ah = ah;
430
431 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
432 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
433
434 while ((skb = __skb_dequeue(&path->queue)))
435 __skb_queue_tail(&skqueue, skb);
436
437 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
438 if (neigh->ah) {
439 WARN_ON(neigh->ah != old_ah);
440 /*
441 * Dropping the ah reference inside
442 * priv->lock is safe here, because we
443 * will hold one more reference from
444 * the original value of path->ah (ie
445 * old_ah).
446 */
447 ipoib_put_ah(neigh->ah);
448 }
449 kref_get(&path->ah->ref);
450 neigh->ah = path->ah;
451 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
452 sizeof(union ib_gid));
453
454 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
455 if (!ipoib_cm_get(neigh))
456 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
457 path,
458 neigh));
459 if (!ipoib_cm_get(neigh)) {
460 list_del(&neigh->list);
461 if (neigh->ah)
462 ipoib_put_ah(neigh->ah);
463 ipoib_neigh_free(dev, neigh);
464 continue;
465 }
466 }
467
468 while ((skb = __skb_dequeue(&neigh->queue)))
469 __skb_queue_tail(&skqueue, skb);
470 }
471 path->valid = 1;
472 }
473
474 path->query = NULL;
475 complete(&path->done);
476
477 spin_unlock_irqrestore(&priv->lock, flags);
478
479 if (old_ah)
480 ipoib_put_ah(old_ah);
481
482 while ((skb = __skb_dequeue(&skqueue))) {
483 skb->dev = dev;
484 if (dev_queue_xmit(skb))
485 ipoib_warn(priv, "dev_queue_xmit failed "
486 "to requeue packet\n");
487 }
488 }
489
path_rec_create(struct net_device * dev,void * gid)490 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
491 {
492 struct ipoib_dev_priv *priv = netdev_priv(dev);
493 struct ipoib_path *path;
494
495 if (!priv->broadcast)
496 return NULL;
497
498 path = kzalloc(sizeof *path, GFP_ATOMIC);
499 if (!path)
500 return NULL;
501
502 path->dev = dev;
503
504 skb_queue_head_init(&path->queue);
505
506 INIT_LIST_HEAD(&path->neigh_list);
507
508 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
509 path->pathrec.sgid = priv->local_gid;
510 path->pathrec.pkey = cpu_to_be16(priv->pkey);
511 path->pathrec.numb_path = 1;
512 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
513
514 return path;
515 }
516
path_rec_start(struct net_device * dev,struct ipoib_path * path)517 static int path_rec_start(struct net_device *dev,
518 struct ipoib_path *path)
519 {
520 struct ipoib_dev_priv *priv = netdev_priv(dev);
521
522 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
523 path->pathrec.dgid.raw);
524
525 init_completion(&path->done);
526
527 path->query_id =
528 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
529 &path->pathrec,
530 IB_SA_PATH_REC_DGID |
531 IB_SA_PATH_REC_SGID |
532 IB_SA_PATH_REC_NUMB_PATH |
533 IB_SA_PATH_REC_TRAFFIC_CLASS |
534 IB_SA_PATH_REC_PKEY,
535 1000, GFP_ATOMIC,
536 path_rec_completion,
537 path, &path->query);
538 if (path->query_id < 0) {
539 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
540 path->query = NULL;
541 complete(&path->done);
542 return path->query_id;
543 }
544
545 return 0;
546 }
547
neigh_add_path(struct sk_buff * skb,struct net_device * dev)548 static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
549 {
550 struct ipoib_dev_priv *priv = netdev_priv(dev);
551 struct ipoib_path *path;
552 struct ipoib_neigh *neigh;
553 unsigned long flags;
554
555 neigh = ipoib_neigh_alloc(skb_dst(skb)->neighbour, skb->dev);
556 if (!neigh) {
557 ++dev->stats.tx_dropped;
558 dev_kfree_skb_any(skb);
559 return;
560 }
561
562 spin_lock_irqsave(&priv->lock, flags);
563
564 path = __path_find(dev, skb_dst(skb)->neighbour->ha + 4);
565 if (!path) {
566 path = path_rec_create(dev, skb_dst(skb)->neighbour->ha + 4);
567 if (!path)
568 goto err_path;
569
570 __path_add(dev, path);
571 }
572
573 list_add_tail(&neigh->list, &path->neigh_list);
574
575 if (path->ah) {
576 kref_get(&path->ah->ref);
577 neigh->ah = path->ah;
578 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
579 sizeof(union ib_gid));
580
581 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
582 if (!ipoib_cm_get(neigh))
583 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
584 if (!ipoib_cm_get(neigh)) {
585 list_del(&neigh->list);
586 if (neigh->ah)
587 ipoib_put_ah(neigh->ah);
588 ipoib_neigh_free(dev, neigh);
589 goto err_drop;
590 }
591 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
592 __skb_queue_tail(&neigh->queue, skb);
593 else {
594 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
595 skb_queue_len(&neigh->queue));
596 goto err_drop;
597 }
598 } else {
599 spin_unlock_irqrestore(&priv->lock, flags);
600 ipoib_send(dev, skb, path->ah, IPOIB_QPN(skb_dst(skb)->neighbour->ha));
601 return;
602 }
603 } else {
604 neigh->ah = NULL;
605
606 if (!path->query && path_rec_start(dev, path))
607 goto err_list;
608
609 __skb_queue_tail(&neigh->queue, skb);
610 }
611
612 spin_unlock_irqrestore(&priv->lock, flags);
613 return;
614
615 err_list:
616 list_del(&neigh->list);
617
618 err_path:
619 ipoib_neigh_free(dev, neigh);
620 err_drop:
621 ++dev->stats.tx_dropped;
622 dev_kfree_skb_any(skb);
623
624 spin_unlock_irqrestore(&priv->lock, flags);
625 }
626
ipoib_path_lookup(struct sk_buff * skb,struct net_device * dev)627 static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
628 {
629 struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
630
631 /* Look up path record for unicasts */
632 if (skb_dst(skb)->neighbour->ha[4] != 0xff) {
633 neigh_add_path(skb, dev);
634 return;
635 }
636
637 /* Add in the P_Key for multicasts */
638 skb_dst(skb)->neighbour->ha[8] = (priv->pkey >> 8) & 0xff;
639 skb_dst(skb)->neighbour->ha[9] = priv->pkey & 0xff;
640 ipoib_mcast_send(dev, skb_dst(skb)->neighbour->ha + 4, skb);
641 }
642
unicast_arp_send(struct sk_buff * skb,struct net_device * dev,struct ipoib_pseudoheader * phdr)643 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
644 struct ipoib_pseudoheader *phdr)
645 {
646 struct ipoib_dev_priv *priv = netdev_priv(dev);
647 struct ipoib_path *path;
648 unsigned long flags;
649
650 spin_lock_irqsave(&priv->lock, flags);
651
652 path = __path_find(dev, phdr->hwaddr + 4);
653 if (!path || !path->valid) {
654 int new_path = 0;
655
656 if (!path) {
657 path = path_rec_create(dev, phdr->hwaddr + 4);
658 new_path = 1;
659 }
660 if (path) {
661 /* put pseudoheader back on for next time */
662 skb_push(skb, sizeof *phdr);
663 __skb_queue_tail(&path->queue, skb);
664
665 if (!path->query && path_rec_start(dev, path)) {
666 spin_unlock_irqrestore(&priv->lock, flags);
667 if (new_path)
668 path_free(dev, path);
669 return;
670 } else
671 __path_add(dev, path);
672 } else {
673 ++dev->stats.tx_dropped;
674 dev_kfree_skb_any(skb);
675 }
676
677 spin_unlock_irqrestore(&priv->lock, flags);
678 return;
679 }
680
681 if (path->ah) {
682 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
683 be16_to_cpu(path->pathrec.dlid));
684
685 spin_unlock_irqrestore(&priv->lock, flags);
686 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
687 return;
688 } else if ((path->query || !path_rec_start(dev, path)) &&
689 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
690 /* put pseudoheader back on for next time */
691 skb_push(skb, sizeof *phdr);
692 __skb_queue_tail(&path->queue, skb);
693 } else {
694 ++dev->stats.tx_dropped;
695 dev_kfree_skb_any(skb);
696 }
697
698 spin_unlock_irqrestore(&priv->lock, flags);
699 }
700
ipoib_start_xmit(struct sk_buff * skb,struct net_device * dev)701 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
702 {
703 struct ipoib_dev_priv *priv = netdev_priv(dev);
704 struct ipoib_neigh *neigh;
705 unsigned long flags;
706
707 if (likely(skb_dst(skb) && skb_dst(skb)->neighbour)) {
708 if (unlikely(!*to_ipoib_neigh(skb_dst(skb)->neighbour))) {
709 ipoib_path_lookup(skb, dev);
710 return NETDEV_TX_OK;
711 }
712
713 neigh = *to_ipoib_neigh(skb_dst(skb)->neighbour);
714
715 if (unlikely((memcmp(&neigh->dgid.raw,
716 skb_dst(skb)->neighbour->ha + 4,
717 sizeof(union ib_gid))) ||
718 (neigh->dev != dev))) {
719 spin_lock_irqsave(&priv->lock, flags);
720 /*
721 * It's safe to call ipoib_put_ah() inside
722 * priv->lock here, because we know that
723 * path->ah will always hold one more reference,
724 * so ipoib_put_ah() will never do more than
725 * decrement the ref count.
726 */
727 if (neigh->ah)
728 ipoib_put_ah(neigh->ah);
729 list_del(&neigh->list);
730 ipoib_neigh_free(dev, neigh);
731 spin_unlock_irqrestore(&priv->lock, flags);
732 ipoib_path_lookup(skb, dev);
733 return NETDEV_TX_OK;
734 }
735
736 if (ipoib_cm_get(neigh)) {
737 if (ipoib_cm_up(neigh)) {
738 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
739 return NETDEV_TX_OK;
740 }
741 } else if (neigh->ah) {
742 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(skb_dst(skb)->neighbour->ha));
743 return NETDEV_TX_OK;
744 }
745
746 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
747 spin_lock_irqsave(&priv->lock, flags);
748 __skb_queue_tail(&neigh->queue, skb);
749 spin_unlock_irqrestore(&priv->lock, flags);
750 } else {
751 ++dev->stats.tx_dropped;
752 dev_kfree_skb_any(skb);
753 }
754 } else {
755 struct ipoib_pseudoheader *phdr =
756 (struct ipoib_pseudoheader *) skb->data;
757 skb_pull(skb, sizeof *phdr);
758
759 if (phdr->hwaddr[4] == 0xff) {
760 /* Add in the P_Key for multicast*/
761 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
762 phdr->hwaddr[9] = priv->pkey & 0xff;
763
764 ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
765 } else {
766 /* unicast GID -- should be ARP or RARP reply */
767
768 if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
769 (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
770 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x %pI6\n",
771 skb_dst(skb) ? "neigh" : "dst",
772 be16_to_cpup((__be16 *) skb->data),
773 IPOIB_QPN(phdr->hwaddr),
774 phdr->hwaddr + 4);
775 dev_kfree_skb_any(skb);
776 ++dev->stats.tx_dropped;
777 return NETDEV_TX_OK;
778 }
779
780 unicast_arp_send(skb, dev, phdr);
781 }
782 }
783
784 return NETDEV_TX_OK;
785 }
786
ipoib_timeout(struct net_device * dev)787 static void ipoib_timeout(struct net_device *dev)
788 {
789 struct ipoib_dev_priv *priv = netdev_priv(dev);
790
791 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
792 jiffies_to_msecs(jiffies - dev->trans_start));
793 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
794 netif_queue_stopped(dev),
795 priv->tx_head, priv->tx_tail);
796 /* XXX reset QP, etc. */
797 }
798
ipoib_hard_header(struct sk_buff * skb,struct net_device * dev,unsigned short type,const void * daddr,const void * saddr,unsigned len)799 static int ipoib_hard_header(struct sk_buff *skb,
800 struct net_device *dev,
801 unsigned short type,
802 const void *daddr, const void *saddr, unsigned len)
803 {
804 struct ipoib_header *header;
805
806 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
807
808 header->proto = htons(type);
809 header->reserved = 0;
810
811 /*
812 * If we don't have a neighbour structure, stuff the
813 * destination address onto the front of the skb so we can
814 * figure out where to send the packet later.
815 */
816 if ((!skb_dst(skb) || !skb_dst(skb)->neighbour) && daddr) {
817 struct ipoib_pseudoheader *phdr =
818 (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
819 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
820 }
821
822 return 0;
823 }
824
ipoib_set_mcast_list(struct net_device * dev)825 static void ipoib_set_mcast_list(struct net_device *dev)
826 {
827 struct ipoib_dev_priv *priv = netdev_priv(dev);
828
829 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
830 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
831 return;
832 }
833
834 queue_work(ipoib_workqueue, &priv->restart_task);
835 }
836
ipoib_neigh_cleanup(struct neighbour * n)837 static void ipoib_neigh_cleanup(struct neighbour *n)
838 {
839 struct ipoib_neigh *neigh;
840 struct ipoib_dev_priv *priv = netdev_priv(n->dev);
841 unsigned long flags;
842 struct ipoib_ah *ah = NULL;
843
844 neigh = *to_ipoib_neigh(n);
845 if (neigh)
846 priv = netdev_priv(neigh->dev);
847 else
848 return;
849 ipoib_dbg(priv,
850 "neigh_cleanup for %06x %pI6\n",
851 IPOIB_QPN(n->ha),
852 n->ha + 4);
853
854 spin_lock_irqsave(&priv->lock, flags);
855
856 if (neigh->ah)
857 ah = neigh->ah;
858 list_del(&neigh->list);
859 ipoib_neigh_free(n->dev, neigh);
860
861 spin_unlock_irqrestore(&priv->lock, flags);
862
863 if (ah)
864 ipoib_put_ah(ah);
865 }
866
ipoib_neigh_alloc(struct neighbour * neighbour,struct net_device * dev)867 struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
868 struct net_device *dev)
869 {
870 struct ipoib_neigh *neigh;
871
872 neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
873 if (!neigh)
874 return NULL;
875
876 neigh->neighbour = neighbour;
877 neigh->dev = dev;
878 memset(&neigh->dgid.raw, 0, sizeof (union ib_gid));
879 *to_ipoib_neigh(neighbour) = neigh;
880 skb_queue_head_init(&neigh->queue);
881 ipoib_cm_set(neigh, NULL);
882
883 return neigh;
884 }
885
ipoib_neigh_free(struct net_device * dev,struct ipoib_neigh * neigh)886 void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
887 {
888 struct sk_buff *skb;
889 *to_ipoib_neigh(neigh->neighbour) = NULL;
890 while ((skb = __skb_dequeue(&neigh->queue))) {
891 ++dev->stats.tx_dropped;
892 dev_kfree_skb_any(skb);
893 }
894 if (ipoib_cm_get(neigh))
895 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
896 kfree(neigh);
897 }
898
ipoib_neigh_setup_dev(struct net_device * dev,struct neigh_parms * parms)899 static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
900 {
901 parms->neigh_cleanup = ipoib_neigh_cleanup;
902
903 return 0;
904 }
905
ipoib_dev_init(struct net_device * dev,struct ib_device * ca,int port)906 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
907 {
908 struct ipoib_dev_priv *priv = netdev_priv(dev);
909
910 /* Allocate RX/TX "rings" to hold queued skbs */
911 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
912 GFP_KERNEL);
913 if (!priv->rx_ring) {
914 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
915 ca->name, ipoib_recvq_size);
916 goto out;
917 }
918
919 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
920 if (!priv->tx_ring) {
921 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
922 ca->name, ipoib_sendq_size);
923 goto out_rx_ring_cleanup;
924 }
925
926 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
927
928 if (ipoib_ib_dev_init(dev, ca, port))
929 goto out_tx_ring_cleanup;
930
931 return 0;
932
933 out_tx_ring_cleanup:
934 vfree(priv->tx_ring);
935
936 out_rx_ring_cleanup:
937 kfree(priv->rx_ring);
938
939 out:
940 return -ENOMEM;
941 }
942
ipoib_dev_cleanup(struct net_device * dev)943 void ipoib_dev_cleanup(struct net_device *dev)
944 {
945 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
946
947 ipoib_delete_debug_files(dev);
948
949 /* Delete any child interfaces first */
950 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
951 unregister_netdev(cpriv->dev);
952 ipoib_dev_cleanup(cpriv->dev);
953 free_netdev(cpriv->dev);
954 }
955
956 ipoib_ib_dev_cleanup(dev);
957
958 kfree(priv->rx_ring);
959 vfree(priv->tx_ring);
960
961 priv->rx_ring = NULL;
962 priv->tx_ring = NULL;
963 }
964
965 static const struct header_ops ipoib_header_ops = {
966 .create = ipoib_hard_header,
967 };
968
969 static const struct net_device_ops ipoib_netdev_ops = {
970 .ndo_open = ipoib_open,
971 .ndo_stop = ipoib_stop,
972 .ndo_change_mtu = ipoib_change_mtu,
973 .ndo_start_xmit = ipoib_start_xmit,
974 .ndo_tx_timeout = ipoib_timeout,
975 .ndo_set_multicast_list = ipoib_set_mcast_list,
976 .ndo_neigh_setup = ipoib_neigh_setup_dev,
977 };
978
ipoib_setup(struct net_device * dev)979 static void ipoib_setup(struct net_device *dev)
980 {
981 struct ipoib_dev_priv *priv = netdev_priv(dev);
982
983 dev->netdev_ops = &ipoib_netdev_ops;
984 dev->header_ops = &ipoib_header_ops;
985
986 ipoib_set_ethtool_ops(dev);
987
988 netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
989
990 dev->watchdog_timeo = HZ;
991
992 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
993
994 /*
995 * We add in INFINIBAND_ALEN to allow for the destination
996 * address "pseudoheader" for skbs without neighbour struct.
997 */
998 dev->hard_header_len = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
999 dev->addr_len = INFINIBAND_ALEN;
1000 dev->type = ARPHRD_INFINIBAND;
1001 dev->tx_queue_len = ipoib_sendq_size * 2;
1002 dev->features = (NETIF_F_VLAN_CHALLENGED |
1003 NETIF_F_HIGHDMA);
1004 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1005
1006 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1007
1008 netif_carrier_off(dev);
1009
1010 priv->dev = dev;
1011
1012 spin_lock_init(&priv->lock);
1013
1014 mutex_init(&priv->vlan_mutex);
1015
1016 INIT_LIST_HEAD(&priv->path_list);
1017 INIT_LIST_HEAD(&priv->child_intfs);
1018 INIT_LIST_HEAD(&priv->dead_ahs);
1019 INIT_LIST_HEAD(&priv->multicast_list);
1020
1021 INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1022 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1023 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1024 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
1025 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
1026 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
1027 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1028 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1029 }
1030
ipoib_intf_alloc(const char * name)1031 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1032 {
1033 struct net_device *dev;
1034
1035 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1036 ipoib_setup);
1037 if (!dev)
1038 return NULL;
1039
1040 return netdev_priv(dev);
1041 }
1042
show_pkey(struct device * dev,struct device_attribute * attr,char * buf)1043 static ssize_t show_pkey(struct device *dev,
1044 struct device_attribute *attr, char *buf)
1045 {
1046 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1047
1048 return sprintf(buf, "0x%04x\n", priv->pkey);
1049 }
1050 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1051
show_umcast(struct device * dev,struct device_attribute * attr,char * buf)1052 static ssize_t show_umcast(struct device *dev,
1053 struct device_attribute *attr, char *buf)
1054 {
1055 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1056
1057 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1058 }
1059
set_umcast(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1060 static ssize_t set_umcast(struct device *dev,
1061 struct device_attribute *attr,
1062 const char *buf, size_t count)
1063 {
1064 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1065 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1066
1067 if (umcast_val > 0) {
1068 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1069 ipoib_warn(priv, "ignoring multicast groups joined directly "
1070 "by userspace\n");
1071 } else
1072 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1073
1074 return count;
1075 }
1076 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1077
ipoib_add_umcast_attr(struct net_device * dev)1078 int ipoib_add_umcast_attr(struct net_device *dev)
1079 {
1080 return device_create_file(&dev->dev, &dev_attr_umcast);
1081 }
1082
create_child(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1083 static ssize_t create_child(struct device *dev,
1084 struct device_attribute *attr,
1085 const char *buf, size_t count)
1086 {
1087 int pkey;
1088 int ret;
1089
1090 if (sscanf(buf, "%i", &pkey) != 1)
1091 return -EINVAL;
1092
1093 if (pkey < 0 || pkey > 0xffff)
1094 return -EINVAL;
1095
1096 /*
1097 * Set the full membership bit, so that we join the right
1098 * broadcast group, etc.
1099 */
1100 pkey |= 0x8000;
1101
1102 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1103
1104 return ret ? ret : count;
1105 }
1106 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1107
delete_child(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1108 static ssize_t delete_child(struct device *dev,
1109 struct device_attribute *attr,
1110 const char *buf, size_t count)
1111 {
1112 int pkey;
1113 int ret;
1114
1115 if (sscanf(buf, "%i", &pkey) != 1)
1116 return -EINVAL;
1117
1118 if (pkey < 0 || pkey > 0xffff)
1119 return -EINVAL;
1120
1121 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1122
1123 return ret ? ret : count;
1124
1125 }
1126 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1127
ipoib_add_pkey_attr(struct net_device * dev)1128 int ipoib_add_pkey_attr(struct net_device *dev)
1129 {
1130 return device_create_file(&dev->dev, &dev_attr_pkey);
1131 }
1132
ipoib_set_dev_features(struct ipoib_dev_priv * priv,struct ib_device * hca)1133 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1134 {
1135 struct ib_device_attr *device_attr;
1136 int result = -ENOMEM;
1137
1138 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1139 if (!device_attr) {
1140 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1141 hca->name, sizeof *device_attr);
1142 return result;
1143 }
1144
1145 result = ib_query_device(hca, device_attr);
1146 if (result) {
1147 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1148 hca->name, result);
1149 kfree(device_attr);
1150 return result;
1151 }
1152 priv->hca_caps = device_attr->device_cap_flags;
1153
1154 kfree(device_attr);
1155
1156 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1157 set_bit(IPOIB_FLAG_CSUM, &priv->flags);
1158 priv->dev->features |= NETIF_F_SG | NETIF_F_IP_CSUM;
1159 }
1160
1161 priv->dev->features |= NETIF_F_GRO;
1162
1163 if (priv->dev->features & NETIF_F_SG && priv->hca_caps & IB_DEVICE_UD_TSO)
1164 priv->dev->features |= NETIF_F_TSO;
1165
1166 return 0;
1167 }
1168
1169
ipoib_add_port(const char * format,struct ib_device * hca,u8 port)1170 static struct net_device *ipoib_add_port(const char *format,
1171 struct ib_device *hca, u8 port)
1172 {
1173 struct ipoib_dev_priv *priv;
1174 struct ib_port_attr attr;
1175 int result = -ENOMEM;
1176
1177 priv = ipoib_intf_alloc(format);
1178 if (!priv)
1179 goto alloc_mem_failed;
1180
1181 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1182 priv->dev->dev_id = port - 1;
1183
1184 if (!ib_query_port(hca, port, &attr))
1185 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1186 else {
1187 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1188 hca->name, port);
1189 goto device_init_failed;
1190 }
1191
1192 /* MTU will be reset when mcast join happens */
1193 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1194 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
1195
1196 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1197 if (result) {
1198 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1199 hca->name, port, result);
1200 goto device_init_failed;
1201 }
1202
1203 if (ipoib_set_dev_features(priv, hca))
1204 goto device_init_failed;
1205
1206 /*
1207 * Set the full membership bit, so that we join the right
1208 * broadcast group, etc.
1209 */
1210 priv->pkey |= 0x8000;
1211
1212 priv->dev->broadcast[8] = priv->pkey >> 8;
1213 priv->dev->broadcast[9] = priv->pkey & 0xff;
1214
1215 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1216 if (result) {
1217 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1218 hca->name, port, result);
1219 goto device_init_failed;
1220 } else
1221 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1222
1223 result = ipoib_dev_init(priv->dev, hca, port);
1224 if (result < 0) {
1225 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1226 hca->name, port, result);
1227 goto device_init_failed;
1228 }
1229
1230 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1231 priv->ca, ipoib_event);
1232 result = ib_register_event_handler(&priv->event_handler);
1233 if (result < 0) {
1234 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1235 "port %d (ret = %d)\n",
1236 hca->name, port, result);
1237 goto event_failed;
1238 }
1239
1240 result = register_netdev(priv->dev);
1241 if (result) {
1242 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1243 hca->name, port, result);
1244 goto register_failed;
1245 }
1246
1247 ipoib_create_debug_files(priv->dev);
1248
1249 if (ipoib_cm_add_mode_attr(priv->dev))
1250 goto sysfs_failed;
1251 if (ipoib_add_pkey_attr(priv->dev))
1252 goto sysfs_failed;
1253 if (ipoib_add_umcast_attr(priv->dev))
1254 goto sysfs_failed;
1255 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1256 goto sysfs_failed;
1257 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1258 goto sysfs_failed;
1259
1260 return priv->dev;
1261
1262 sysfs_failed:
1263 ipoib_delete_debug_files(priv->dev);
1264 unregister_netdev(priv->dev);
1265
1266 register_failed:
1267 ib_unregister_event_handler(&priv->event_handler);
1268 flush_workqueue(ipoib_workqueue);
1269
1270 event_failed:
1271 ipoib_dev_cleanup(priv->dev);
1272
1273 device_init_failed:
1274 free_netdev(priv->dev);
1275
1276 alloc_mem_failed:
1277 return ERR_PTR(result);
1278 }
1279
ipoib_add_one(struct ib_device * device)1280 static void ipoib_add_one(struct ib_device *device)
1281 {
1282 struct list_head *dev_list;
1283 struct net_device *dev;
1284 struct ipoib_dev_priv *priv;
1285 int s, e, p;
1286
1287 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1288 return;
1289
1290 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1291 if (!dev_list)
1292 return;
1293
1294 INIT_LIST_HEAD(dev_list);
1295
1296 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1297 s = 0;
1298 e = 0;
1299 } else {
1300 s = 1;
1301 e = device->phys_port_cnt;
1302 }
1303
1304 for (p = s; p <= e; ++p) {
1305 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1306 continue;
1307 dev = ipoib_add_port("ib%d", device, p);
1308 if (!IS_ERR(dev)) {
1309 priv = netdev_priv(dev);
1310 list_add_tail(&priv->list, dev_list);
1311 }
1312 }
1313
1314 ib_set_client_data(device, &ipoib_client, dev_list);
1315 }
1316
ipoib_remove_one(struct ib_device * device)1317 static void ipoib_remove_one(struct ib_device *device)
1318 {
1319 struct ipoib_dev_priv *priv, *tmp;
1320 struct list_head *dev_list;
1321
1322 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1323 return;
1324
1325 dev_list = ib_get_client_data(device, &ipoib_client);
1326
1327 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1328 ib_unregister_event_handler(&priv->event_handler);
1329
1330 rtnl_lock();
1331 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1332 rtnl_unlock();
1333
1334 flush_workqueue(ipoib_workqueue);
1335
1336 unregister_netdev(priv->dev);
1337 ipoib_dev_cleanup(priv->dev);
1338 free_netdev(priv->dev);
1339 }
1340
1341 kfree(dev_list);
1342 }
1343
ipoib_init_module(void)1344 static int __init ipoib_init_module(void)
1345 {
1346 int ret;
1347
1348 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1349 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1350 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1351
1352 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1353 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1354 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1355 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1356 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1357 #endif
1358
1359 /*
1360 * When copying small received packets, we only copy from the
1361 * linear data part of the SKB, so we rely on this condition.
1362 */
1363 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1364
1365 ret = ipoib_register_debugfs();
1366 if (ret)
1367 return ret;
1368
1369 /*
1370 * We create our own workqueue mainly because we want to be
1371 * able to flush it when devices are being removed. We can't
1372 * use schedule_work()/flush_scheduled_work() because both
1373 * unregister_netdev() and linkwatch_event take the rtnl lock,
1374 * so flush_scheduled_work() can deadlock during device
1375 * removal.
1376 */
1377 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1378 if (!ipoib_workqueue) {
1379 ret = -ENOMEM;
1380 goto err_fs;
1381 }
1382
1383 ib_sa_register_client(&ipoib_sa_client);
1384
1385 ret = ib_register_client(&ipoib_client);
1386 if (ret)
1387 goto err_sa;
1388
1389 return 0;
1390
1391 err_sa:
1392 ib_sa_unregister_client(&ipoib_sa_client);
1393 destroy_workqueue(ipoib_workqueue);
1394
1395 err_fs:
1396 ipoib_unregister_debugfs();
1397
1398 return ret;
1399 }
1400
ipoib_cleanup_module(void)1401 static void __exit ipoib_cleanup_module(void)
1402 {
1403 ib_unregister_client(&ipoib_client);
1404 ib_sa_unregister_client(&ipoib_sa_client);
1405 ipoib_unregister_debugfs();
1406 destroy_workqueue(ipoib_workqueue);
1407 }
1408
1409 module_init(ipoib_init_module);
1410 module_exit(ipoib_cleanup_module);
1411