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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
51MODULE_AUTHOR("Roland Dreier");
52MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
53MODULE_LICENSE("Dual BSD/GPL");
54
55int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
56int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
57
58module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
59MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
60module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
61MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
62
63#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
64int ipoib_debug_level;
65
66module_param_named(debug_level, ipoib_debug_level, int, 0644);
67MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
68#endif
69
70struct ipoib_path_iter {
71 struct net_device *dev;
72 struct ipoib_path path;
73};
74
75static 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
81struct workqueue_struct *ipoib_workqueue;
82
83struct ib_sa_client ipoib_sa_client;
84
85static void ipoib_add_one(struct ib_device *device);
86static void ipoib_remove_one(struct ib_device *device);
87
88static struct ib_client ipoib_client = {
89 .name = "ipoib",
90 .add = ipoib_add_one,
91 .remove = ipoib_remove_one
92};
93
94int 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
132err_stop:
133 ipoib_ib_dev_stop(dev, 1);
134
135err_disable:
136 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
137
138 return -EINVAL;
139}
140
141static 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
174static u32 ipoib_fix_features(struct net_device *dev, u32 features)
175{
176 struct ipoib_dev_priv *priv = netdev_priv(dev);
177
178 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
179 features &= ~(NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_TSO);
180
181 return features;
182}
183
184static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
185{
186 struct ipoib_dev_priv *priv = netdev_priv(dev);
187
188 /* dev->mtu > 2K ==> connected mode */
189 if (ipoib_cm_admin_enabled(dev)) {
190 if (new_mtu > ipoib_cm_max_mtu(dev))
191 return -EINVAL;
192
193 if (new_mtu > priv->mcast_mtu)
194 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
195 priv->mcast_mtu);
196
197 dev->mtu = new_mtu;
198 return 0;
199 }
200
201 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
202 return -EINVAL;
203
204 priv->admin_mtu = new_mtu;
205
206 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
207
208 return 0;
209}
210
211static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
212{
213 struct ipoib_dev_priv *priv = netdev_priv(dev);
214 struct rb_node *n = priv->path_tree.rb_node;
215 struct ipoib_path *path;
216 int ret;
217
218 while (n) {
219 path = rb_entry(n, struct ipoib_path, rb_node);
220
221 ret = memcmp(gid, path->pathrec.dgid.raw,
222 sizeof (union ib_gid));
223
224 if (ret < 0)
225 n = n->rb_left;
226 else if (ret > 0)
227 n = n->rb_right;
228 else
229 return path;
230 }
231
232 return NULL;
233}
234
235static int __path_add(struct net_device *dev, struct ipoib_path *path)
236{
237 struct ipoib_dev_priv *priv = netdev_priv(dev);
238 struct rb_node **n = &priv->path_tree.rb_node;
239 struct rb_node *pn = NULL;
240 struct ipoib_path *tpath;
241 int ret;
242
243 while (*n) {
244 pn = *n;
245 tpath = rb_entry(pn, struct ipoib_path, rb_node);
246
247 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
248 sizeof (union ib_gid));
249 if (ret < 0)
250 n = &pn->rb_left;
251 else if (ret > 0)
252 n = &pn->rb_right;
253 else
254 return -EEXIST;
255 }
256
257 rb_link_node(&path->rb_node, pn, n);
258 rb_insert_color(&path->rb_node, &priv->path_tree);
259
260 list_add_tail(&path->list, &priv->path_list);
261
262 return 0;
263}
264
265static void path_free(struct net_device *dev, struct ipoib_path *path)
266{
267 struct ipoib_dev_priv *priv = netdev_priv(dev);
268 struct ipoib_neigh *neigh, *tn;
269 struct sk_buff *skb;
270 unsigned long flags;
271
272 while ((skb = __skb_dequeue(&path->queue)))
273 dev_kfree_skb_irq(skb);
274
275 spin_lock_irqsave(&priv->lock, flags);
276
277 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
278 /*
279 * It's safe to call ipoib_put_ah() inside priv->lock
280 * here, because we know that path->ah will always
281 * hold one more reference, so ipoib_put_ah() will
282 * never do more than decrement the ref count.
283 */
284 if (neigh->ah)
285 ipoib_put_ah(neigh->ah);
286
287 ipoib_neigh_free(dev, neigh);
288 }
289
290 spin_unlock_irqrestore(&priv->lock, flags);
291
292 if (path->ah)
293 ipoib_put_ah(path->ah);
294
295 kfree(path);
296}
297
298#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
299
300struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
301{
302 struct ipoib_path_iter *iter;
303
304 iter = kmalloc(sizeof *iter, GFP_KERNEL);
305 if (!iter)
306 return NULL;
307
308 iter->dev = dev;
309 memset(iter->path.pathrec.dgid.raw, 0, 16);
310
311 if (ipoib_path_iter_next(iter)) {
312 kfree(iter);
313 return NULL;
314 }
315
316 return iter;
317}
318
319int ipoib_path_iter_next(struct ipoib_path_iter *iter)
320{
321 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
322 struct rb_node *n;
323 struct ipoib_path *path;
324 int ret = 1;
325
326 spin_lock_irq(&priv->lock);
327
328 n = rb_first(&priv->path_tree);
329
330 while (n) {
331 path = rb_entry(n, struct ipoib_path, rb_node);
332
333 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
334 sizeof (union ib_gid)) < 0) {
335 iter->path = *path;
336 ret = 0;
337 break;
338 }
339
340 n = rb_next(n);
341 }
342
343 spin_unlock_irq(&priv->lock);
344
345 return ret;
346}
347
348void ipoib_path_iter_read(struct ipoib_path_iter *iter,
349 struct ipoib_path *path)
350{
351 *path = iter->path;
352}
353
354#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
355
356void ipoib_mark_paths_invalid(struct net_device *dev)
357{
358 struct ipoib_dev_priv *priv = netdev_priv(dev);
359 struct ipoib_path *path, *tp;
360
361 spin_lock_irq(&priv->lock);
362
363 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
364 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
365 be16_to_cpu(path->pathrec.dlid),
366 path->pathrec.dgid.raw);
367 path->valid = 0;
368 }
369
370 spin_unlock_irq(&priv->lock);
371}
372
373void ipoib_flush_paths(struct net_device *dev)
374{
375 struct ipoib_dev_priv *priv = netdev_priv(dev);
376 struct ipoib_path *path, *tp;
377 LIST_HEAD(remove_list);
378 unsigned long flags;
379
380 netif_tx_lock_bh(dev);
381 spin_lock_irqsave(&priv->lock, flags);
382
383 list_splice_init(&priv->path_list, &remove_list);
384
385 list_for_each_entry(path, &remove_list, list)
386 rb_erase(&path->rb_node, &priv->path_tree);
387
388 list_for_each_entry_safe(path, tp, &remove_list, list) {
389 if (path->query)
390 ib_sa_cancel_query(path->query_id, path->query);
391 spin_unlock_irqrestore(&priv->lock, flags);
392 netif_tx_unlock_bh(dev);
393 wait_for_completion(&path->done);
394 path_free(dev, path);
395 netif_tx_lock_bh(dev);
396 spin_lock_irqsave(&priv->lock, flags);
397 }
398
399 spin_unlock_irqrestore(&priv->lock, flags);
400 netif_tx_unlock_bh(dev);
401}
402
403static void path_rec_completion(int status,
404 struct ib_sa_path_rec *pathrec,
405 void *path_ptr)
406{
407 struct ipoib_path *path = path_ptr;
408 struct net_device *dev = path->dev;
409 struct ipoib_dev_priv *priv = netdev_priv(dev);
410 struct ipoib_ah *ah = NULL;
411 struct ipoib_ah *old_ah = NULL;
412 struct ipoib_neigh *neigh, *tn;
413 struct sk_buff_head skqueue;
414 struct sk_buff *skb;
415 unsigned long flags;
416
417 if (!status)
418 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
419 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
420 else
421 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
422 status, path->pathrec.dgid.raw);
423
424 skb_queue_head_init(&skqueue);
425
426 if (!status) {
427 struct ib_ah_attr av;
428
429 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
430 ah = ipoib_create_ah(dev, priv->pd, &av);
431 }
432
433 spin_lock_irqsave(&priv->lock, flags);
434
435 if (ah) {
436 path->pathrec = *pathrec;
437
438 old_ah = path->ah;
439 path->ah = ah;
440
441 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
442 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
443
444 while ((skb = __skb_dequeue(&path->queue)))
445 __skb_queue_tail(&skqueue, skb);
446
447 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
448 if (neigh->ah) {
449 WARN_ON(neigh->ah != old_ah);
450 /*
451 * Dropping the ah reference inside
452 * priv->lock is safe here, because we
453 * will hold one more reference from
454 * the original value of path->ah (ie
455 * old_ah).
456 */
457 ipoib_put_ah(neigh->ah);
458 }
459 kref_get(&path->ah->ref);
460 neigh->ah = path->ah;
461 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
462 sizeof(union ib_gid));
463
464 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
465 if (!ipoib_cm_get(neigh))
466 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
467 path,
468 neigh));
469 if (!ipoib_cm_get(neigh)) {
470 list_del(&neigh->list);
471 if (neigh->ah)
472 ipoib_put_ah(neigh->ah);
473 ipoib_neigh_free(dev, neigh);
474 continue;
475 }
476 }
477
478 while ((skb = __skb_dequeue(&neigh->queue)))
479 __skb_queue_tail(&skqueue, skb);
480 }
481 path->valid = 1;
482 }
483
484 path->query = NULL;
485 complete(&path->done);
486
487 spin_unlock_irqrestore(&priv->lock, flags);
488
489 if (old_ah)
490 ipoib_put_ah(old_ah);
491
492 while ((skb = __skb_dequeue(&skqueue))) {
493 skb->dev = dev;
494 if (dev_queue_xmit(skb))
495 ipoib_warn(priv, "dev_queue_xmit failed "
496 "to requeue packet\n");
497 }
498}
499
500static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
501{
502 struct ipoib_dev_priv *priv = netdev_priv(dev);
503 struct ipoib_path *path;
504
505 if (!priv->broadcast)
506 return NULL;
507
508 path = kzalloc(sizeof *path, GFP_ATOMIC);
509 if (!path)
510 return NULL;
511
512 path->dev = dev;
513
514 skb_queue_head_init(&path->queue);
515
516 INIT_LIST_HEAD(&path->neigh_list);
517
518 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
519 path->pathrec.sgid = priv->local_gid;
520 path->pathrec.pkey = cpu_to_be16(priv->pkey);
521 path->pathrec.numb_path = 1;
522 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
523
524 return path;
525}
526
527static int path_rec_start(struct net_device *dev,
528 struct ipoib_path *path)
529{
530 struct ipoib_dev_priv *priv = netdev_priv(dev);
531
532 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
533 path->pathrec.dgid.raw);
534
535 init_completion(&path->done);
536
537 path->query_id =
538 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
539 &path->pathrec,
540 IB_SA_PATH_REC_DGID |
541 IB_SA_PATH_REC_SGID |
542 IB_SA_PATH_REC_NUMB_PATH |
543 IB_SA_PATH_REC_TRAFFIC_CLASS |
544 IB_SA_PATH_REC_PKEY,
545 1000, GFP_ATOMIC,
546 path_rec_completion,
547 path, &path->query);
548 if (path->query_id < 0) {
549 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
550 path->query = NULL;
551 complete(&path->done);
552 return path->query_id;
553 }
554
555 return 0;
556}
557
558static void neigh_add_path(struct sk_buff *skb, struct net_device *dev)
559{
560 struct ipoib_dev_priv *priv = netdev_priv(dev);
561 struct ipoib_path *path;
562 struct ipoib_neigh *neigh;
563 struct neighbour *n;
564 unsigned long flags;
565
566 n = dst_get_neighbour(skb_dst(skb));
567 neigh = ipoib_neigh_alloc(n, skb->dev);
568 if (!neigh) {
569 ++dev->stats.tx_dropped;
570 dev_kfree_skb_any(skb);
571 return;
572 }
573
574 spin_lock_irqsave(&priv->lock, flags);
575
576 path = __path_find(dev, n->ha + 4);
577 if (!path) {
578 path = path_rec_create(dev, n->ha + 4);
579 if (!path)
580 goto err_path;
581
582 __path_add(dev, path);
583 }
584
585 list_add_tail(&neigh->list, &path->neigh_list);
586
587 if (path->ah) {
588 kref_get(&path->ah->ref);
589 neigh->ah = path->ah;
590 memcpy(&neigh->dgid.raw, &path->pathrec.dgid.raw,
591 sizeof(union ib_gid));
592
593 if (ipoib_cm_enabled(dev, neigh->neighbour)) {
594 if (!ipoib_cm_get(neigh))
595 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
596 if (!ipoib_cm_get(neigh)) {
597 list_del(&neigh->list);
598 if (neigh->ah)
599 ipoib_put_ah(neigh->ah);
600 ipoib_neigh_free(dev, neigh);
601 goto err_drop;
602 }
603 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
604 __skb_queue_tail(&neigh->queue, skb);
605 else {
606 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
607 skb_queue_len(&neigh->queue));
608 goto err_drop;
609 }
610 } else {
611 spin_unlock_irqrestore(&priv->lock, flags);
612 ipoib_send(dev, skb, path->ah, IPOIB_QPN(n->ha));
613 return;
614 }
615 } else {
616 neigh->ah = NULL;
617
618 if (!path->query && path_rec_start(dev, path))
619 goto err_list;
620
621 __skb_queue_tail(&neigh->queue, skb);
622 }
623
624 spin_unlock_irqrestore(&priv->lock, flags);
625 return;
626
627err_list:
628 list_del(&neigh->list);
629
630err_path:
631 ipoib_neigh_free(dev, neigh);
632err_drop:
633 ++dev->stats.tx_dropped;
634 dev_kfree_skb_any(skb);
635
636 spin_unlock_irqrestore(&priv->lock, flags);
637}
638
639static void ipoib_path_lookup(struct sk_buff *skb, struct net_device *dev)
640{
641 struct ipoib_dev_priv *priv = netdev_priv(skb->dev);
642 struct dst_entry *dst = skb_dst(skb);
643 struct neighbour *n;
644
645 /* Look up path record for unicasts */
646 n = dst_get_neighbour(dst);
647 if (n->ha[4] != 0xff) {
648 neigh_add_path(skb, dev);
649 return;
650 }
651
652 /* Add in the P_Key for multicasts */
653 n->ha[8] = (priv->pkey >> 8) & 0xff;
654 n->ha[9] = priv->pkey & 0xff;
655 ipoib_mcast_send(dev, n->ha + 4, skb);
656}
657
658static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
659 struct ipoib_pseudoheader *phdr)
660{
661 struct ipoib_dev_priv *priv = netdev_priv(dev);
662 struct ipoib_path *path;
663 unsigned long flags;
664
665 spin_lock_irqsave(&priv->lock, flags);
666
667 path = __path_find(dev, phdr->hwaddr + 4);
668 if (!path || !path->valid) {
669 int new_path = 0;
670
671 if (!path) {
672 path = path_rec_create(dev, phdr->hwaddr + 4);
673 new_path = 1;
674 }
675 if (path) {
676 /* put pseudoheader back on for next time */
677 skb_push(skb, sizeof *phdr);
678 __skb_queue_tail(&path->queue, skb);
679
680 if (!path->query && path_rec_start(dev, path)) {
681 spin_unlock_irqrestore(&priv->lock, flags);
682 if (new_path)
683 path_free(dev, path);
684 return;
685 } else
686 __path_add(dev, path);
687 } else {
688 ++dev->stats.tx_dropped;
689 dev_kfree_skb_any(skb);
690 }
691
692 spin_unlock_irqrestore(&priv->lock, flags);
693 return;
694 }
695
696 if (path->ah) {
697 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
698 be16_to_cpu(path->pathrec.dlid));
699
700 spin_unlock_irqrestore(&priv->lock, flags);
701 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
702 return;
703 } else if ((path->query || !path_rec_start(dev, path)) &&
704 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
705 /* put pseudoheader back on for next time */
706 skb_push(skb, sizeof *phdr);
707 __skb_queue_tail(&path->queue, skb);
708 } else {
709 ++dev->stats.tx_dropped;
710 dev_kfree_skb_any(skb);
711 }
712
713 spin_unlock_irqrestore(&priv->lock, flags);
714}
715
716static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
717{
718 struct ipoib_dev_priv *priv = netdev_priv(dev);
719 struct ipoib_neigh *neigh;
720 struct neighbour *n = NULL;
721 unsigned long flags;
722
723 if (likely(skb_dst(skb)))
724 n = dst_get_neighbour(skb_dst(skb));
725
726 if (likely(n)) {
727 if (unlikely(!*to_ipoib_neigh(n))) {
728 ipoib_path_lookup(skb, dev);
729 return NETDEV_TX_OK;
730 }
731
732 neigh = *to_ipoib_neigh(n);
733
734 if (unlikely((memcmp(&neigh->dgid.raw,
735 n->ha + 4,
736 sizeof(union ib_gid))) ||
737 (neigh->dev != dev))) {
738 spin_lock_irqsave(&priv->lock, flags);
739 /*
740 * It's safe to call ipoib_put_ah() inside
741 * priv->lock here, because we know that
742 * path->ah will always hold one more reference,
743 * so ipoib_put_ah() will never do more than
744 * decrement the ref count.
745 */
746 if (neigh->ah)
747 ipoib_put_ah(neigh->ah);
748 list_del(&neigh->list);
749 ipoib_neigh_free(dev, neigh);
750 spin_unlock_irqrestore(&priv->lock, flags);
751 ipoib_path_lookup(skb, dev);
752 return NETDEV_TX_OK;
753 }
754
755 if (ipoib_cm_get(neigh)) {
756 if (ipoib_cm_up(neigh)) {
757 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
758 return NETDEV_TX_OK;
759 }
760 } else if (neigh->ah) {
761 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(n->ha));
762 return NETDEV_TX_OK;
763 }
764
765 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
766 spin_lock_irqsave(&priv->lock, flags);
767 __skb_queue_tail(&neigh->queue, skb);
768 spin_unlock_irqrestore(&priv->lock, flags);
769 } else {
770 ++dev->stats.tx_dropped;
771 dev_kfree_skb_any(skb);
772 }
773 } else {
774 struct ipoib_pseudoheader *phdr =
775 (struct ipoib_pseudoheader *) skb->data;
776 skb_pull(skb, sizeof *phdr);
777
778 if (phdr->hwaddr[4] == 0xff) {
779 /* Add in the P_Key for multicast*/
780 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
781 phdr->hwaddr[9] = priv->pkey & 0xff;
782
783 ipoib_mcast_send(dev, phdr->hwaddr + 4, skb);
784 } else {
785 /* unicast GID -- should be ARP or RARP reply */
786
787 if ((be16_to_cpup((__be16 *) skb->data) != ETH_P_ARP) &&
788 (be16_to_cpup((__be16 *) skb->data) != ETH_P_RARP)) {
789 ipoib_warn(priv, "Unicast, no %s: type %04x, QPN %06x %pI6\n",
790 skb_dst(skb) ? "neigh" : "dst",
791 be16_to_cpup((__be16 *) skb->data),
792 IPOIB_QPN(phdr->hwaddr),
793 phdr->hwaddr + 4);
794 dev_kfree_skb_any(skb);
795 ++dev->stats.tx_dropped;
796 return NETDEV_TX_OK;
797 }
798
799 unicast_arp_send(skb, dev, phdr);
800 }
801 }
802
803 return NETDEV_TX_OK;
804}
805
806static void ipoib_timeout(struct net_device *dev)
807{
808 struct ipoib_dev_priv *priv = netdev_priv(dev);
809
810 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
811 jiffies_to_msecs(jiffies - dev->trans_start));
812 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
813 netif_queue_stopped(dev),
814 priv->tx_head, priv->tx_tail);
815 /* XXX reset QP, etc. */
816}
817
818static int ipoib_hard_header(struct sk_buff *skb,
819 struct net_device *dev,
820 unsigned short type,
821 const void *daddr, const void *saddr, unsigned len)
822{
823 struct ipoib_header *header;
824 struct dst_entry *dst;
825 struct neighbour *n;
826
827 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
828
829 header->proto = htons(type);
830 header->reserved = 0;
831
832 /*
833 * If we don't have a neighbour structure, stuff the
834 * destination address onto the front of the skb so we can
835 * figure out where to send the packet later.
836 */
837 dst = skb_dst(skb);
838 n = NULL;
839 if (dst)
840 n = dst_get_neighbour(dst);
841 if ((!dst || !n) && daddr) {
842 struct ipoib_pseudoheader *phdr =
843 (struct ipoib_pseudoheader *) skb_push(skb, sizeof *phdr);
844 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
845 }
846
847 return 0;
848}
849
850static void ipoib_set_mcast_list(struct net_device *dev)
851{
852 struct ipoib_dev_priv *priv = netdev_priv(dev);
853
854 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
855 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
856 return;
857 }
858
859 queue_work(ipoib_workqueue, &priv->restart_task);
860}
861
862static void ipoib_neigh_cleanup(struct neighbour *n)
863{
864 struct ipoib_neigh *neigh;
865 struct ipoib_dev_priv *priv = netdev_priv(n->dev);
866 unsigned long flags;
867 struct ipoib_ah *ah = NULL;
868
869 neigh = *to_ipoib_neigh(n);
870 if (neigh)
871 priv = netdev_priv(neigh->dev);
872 else
873 return;
874 ipoib_dbg(priv,
875 "neigh_cleanup for %06x %pI6\n",
876 IPOIB_QPN(n->ha),
877 n->ha + 4);
878
879 spin_lock_irqsave(&priv->lock, flags);
880
881 if (neigh->ah)
882 ah = neigh->ah;
883 list_del(&neigh->list);
884 ipoib_neigh_free(n->dev, neigh);
885
886 spin_unlock_irqrestore(&priv->lock, flags);
887
888 if (ah)
889 ipoib_put_ah(ah);
890}
891
892struct ipoib_neigh *ipoib_neigh_alloc(struct neighbour *neighbour,
893 struct net_device *dev)
894{
895 struct ipoib_neigh *neigh;
896
897 neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
898 if (!neigh)
899 return NULL;
900
901 neigh->neighbour = neighbour;
902 neigh->dev = dev;
903 memset(&neigh->dgid.raw, 0, sizeof (union ib_gid));
904 *to_ipoib_neigh(neighbour) = neigh;
905 skb_queue_head_init(&neigh->queue);
906 ipoib_cm_set(neigh, NULL);
907
908 return neigh;
909}
910
911void ipoib_neigh_free(struct net_device *dev, struct ipoib_neigh *neigh)
912{
913 struct sk_buff *skb;
914 *to_ipoib_neigh(neigh->neighbour) = NULL;
915 while ((skb = __skb_dequeue(&neigh->queue))) {
916 ++dev->stats.tx_dropped;
917 dev_kfree_skb_any(skb);
918 }
919 if (ipoib_cm_get(neigh))
920 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
921 kfree(neigh);
922}
923
924static int ipoib_neigh_setup_dev(struct net_device *dev, struct neigh_parms *parms)
925{
926 parms->neigh_cleanup = ipoib_neigh_cleanup;
927
928 return 0;
929}
930
931int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
932{
933 struct ipoib_dev_priv *priv = netdev_priv(dev);
934
935 /* Allocate RX/TX "rings" to hold queued skbs */
936 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
937 GFP_KERNEL);
938 if (!priv->rx_ring) {
939 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
940 ca->name, ipoib_recvq_size);
941 goto out;
942 }
943
944 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
945 if (!priv->tx_ring) {
946 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
947 ca->name, ipoib_sendq_size);
948 goto out_rx_ring_cleanup;
949 }
950
951 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
952
953 if (ipoib_ib_dev_init(dev, ca, port))
954 goto out_tx_ring_cleanup;
955
956 return 0;
957
958out_tx_ring_cleanup:
959 vfree(priv->tx_ring);
960
961out_rx_ring_cleanup:
962 kfree(priv->rx_ring);
963
964out:
965 return -ENOMEM;
966}
967
968void ipoib_dev_cleanup(struct net_device *dev)
969{
970 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
971
972 ipoib_delete_debug_files(dev);
973
974 /* Delete any child interfaces first */
975 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
976 unregister_netdev(cpriv->dev);
977 ipoib_dev_cleanup(cpriv->dev);
978 free_netdev(cpriv->dev);
979 }
980
981 ipoib_ib_dev_cleanup(dev);
982
983 kfree(priv->rx_ring);
984 vfree(priv->tx_ring);
985
986 priv->rx_ring = NULL;
987 priv->tx_ring = NULL;
988}
989
990static const struct header_ops ipoib_header_ops = {
991 .create = ipoib_hard_header,
992};
993
994static const struct net_device_ops ipoib_netdev_ops = {
995 .ndo_open = ipoib_open,
996 .ndo_stop = ipoib_stop,
997 .ndo_change_mtu = ipoib_change_mtu,
998 .ndo_fix_features = ipoib_fix_features,
999 .ndo_start_xmit = ipoib_start_xmit,
1000 .ndo_tx_timeout = ipoib_timeout,
1001 .ndo_set_multicast_list = ipoib_set_mcast_list,
1002 .ndo_neigh_setup = ipoib_neigh_setup_dev,
1003};
1004
1005static void ipoib_setup(struct net_device *dev)
1006{
1007 struct ipoib_dev_priv *priv = netdev_priv(dev);
1008
1009 dev->netdev_ops = &ipoib_netdev_ops;
1010 dev->header_ops = &ipoib_header_ops;
1011
1012 ipoib_set_ethtool_ops(dev);
1013
1014 netif_napi_add(dev, &priv->napi, ipoib_poll, 100);
1015
1016 dev->watchdog_timeo = HZ;
1017
1018 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
1019
1020 /*
1021 * We add in INFINIBAND_ALEN to allow for the destination
1022 * address "pseudoheader" for skbs without neighbour struct.
1023 */
1024 dev->hard_header_len = IPOIB_ENCAP_LEN + INFINIBAND_ALEN;
1025 dev->addr_len = INFINIBAND_ALEN;
1026 dev->type = ARPHRD_INFINIBAND;
1027 dev->tx_queue_len = ipoib_sendq_size * 2;
1028 dev->features = (NETIF_F_VLAN_CHALLENGED |
1029 NETIF_F_HIGHDMA);
1030 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
1031
1032 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1033
1034 netif_carrier_off(dev);
1035
1036 priv->dev = dev;
1037
1038 spin_lock_init(&priv->lock);
1039
1040 mutex_init(&priv->vlan_mutex);
1041
1042 INIT_LIST_HEAD(&priv->path_list);
1043 INIT_LIST_HEAD(&priv->child_intfs);
1044 INIT_LIST_HEAD(&priv->dead_ahs);
1045 INIT_LIST_HEAD(&priv->multicast_list);
1046
1047 INIT_DELAYED_WORK(&priv->pkey_poll_task, ipoib_pkey_poll);
1048 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1049 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1050 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
1051 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
1052 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
1053 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1054 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1055}
1056
1057struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1058{
1059 struct net_device *dev;
1060
1061 dev = alloc_netdev((int) sizeof (struct ipoib_dev_priv), name,
1062 ipoib_setup);
1063 if (!dev)
1064 return NULL;
1065
1066 return netdev_priv(dev);
1067}
1068
1069static ssize_t show_pkey(struct device *dev,
1070 struct device_attribute *attr, char *buf)
1071{
1072 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1073
1074 return sprintf(buf, "0x%04x\n", priv->pkey);
1075}
1076static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1077
1078static ssize_t show_umcast(struct device *dev,
1079 struct device_attribute *attr, char *buf)
1080{
1081 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1082
1083 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1084}
1085
1086static ssize_t set_umcast(struct device *dev,
1087 struct device_attribute *attr,
1088 const char *buf, size_t count)
1089{
1090 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1091 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1092
1093 if (umcast_val > 0) {
1094 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1095 ipoib_warn(priv, "ignoring multicast groups joined directly "
1096 "by userspace\n");
1097 } else
1098 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1099
1100 return count;
1101}
1102static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1103
1104int ipoib_add_umcast_attr(struct net_device *dev)
1105{
1106 return device_create_file(&dev->dev, &dev_attr_umcast);
1107}
1108
1109static ssize_t create_child(struct device *dev,
1110 struct device_attribute *attr,
1111 const char *buf, size_t count)
1112{
1113 int pkey;
1114 int ret;
1115
1116 if (sscanf(buf, "%i", &pkey) != 1)
1117 return -EINVAL;
1118
1119 if (pkey < 0 || pkey > 0xffff)
1120 return -EINVAL;
1121
1122 /*
1123 * Set the full membership bit, so that we join the right
1124 * broadcast group, etc.
1125 */
1126 pkey |= 0x8000;
1127
1128 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1129
1130 return ret ? ret : count;
1131}
1132static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1133
1134static ssize_t delete_child(struct device *dev,
1135 struct device_attribute *attr,
1136 const char *buf, size_t count)
1137{
1138 int pkey;
1139 int ret;
1140
1141 if (sscanf(buf, "%i", &pkey) != 1)
1142 return -EINVAL;
1143
1144 if (pkey < 0 || pkey > 0xffff)
1145 return -EINVAL;
1146
1147 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1148
1149 return ret ? ret : count;
1150
1151}
1152static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1153
1154int ipoib_add_pkey_attr(struct net_device *dev)
1155{
1156 return device_create_file(&dev->dev, &dev_attr_pkey);
1157}
1158
1159int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1160{
1161 struct ib_device_attr *device_attr;
1162 int result = -ENOMEM;
1163
1164 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1165 if (!device_attr) {
1166 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1167 hca->name, sizeof *device_attr);
1168 return result;
1169 }
1170
1171 result = ib_query_device(hca, device_attr);
1172 if (result) {
1173 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1174 hca->name, result);
1175 kfree(device_attr);
1176 return result;
1177 }
1178 priv->hca_caps = device_attr->device_cap_flags;
1179
1180 kfree(device_attr);
1181
1182 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1183 priv->dev->hw_features = NETIF_F_SG |
1184 NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1185
1186 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1187 priv->dev->hw_features |= NETIF_F_TSO;
1188
1189 priv->dev->features |= priv->dev->hw_features;
1190 }
1191
1192 return 0;
1193}
1194
1195static struct net_device *ipoib_add_port(const char *format,
1196 struct ib_device *hca, u8 port)
1197{
1198 struct ipoib_dev_priv *priv;
1199 struct ib_port_attr attr;
1200 int result = -ENOMEM;
1201
1202 priv = ipoib_intf_alloc(format);
1203 if (!priv)
1204 goto alloc_mem_failed;
1205
1206 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1207 priv->dev->dev_id = port - 1;
1208
1209 if (!ib_query_port(hca, port, &attr))
1210 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1211 else {
1212 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1213 hca->name, port);
1214 goto device_init_failed;
1215 }
1216
1217 /* MTU will be reset when mcast join happens */
1218 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1219 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
1220
1221 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1222 if (result) {
1223 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1224 hca->name, port, result);
1225 goto device_init_failed;
1226 }
1227
1228 if (ipoib_set_dev_features(priv, hca))
1229 goto device_init_failed;
1230
1231 /*
1232 * Set the full membership bit, so that we join the right
1233 * broadcast group, etc.
1234 */
1235 priv->pkey |= 0x8000;
1236
1237 priv->dev->broadcast[8] = priv->pkey >> 8;
1238 priv->dev->broadcast[9] = priv->pkey & 0xff;
1239
1240 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1241 if (result) {
1242 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1243 hca->name, port, result);
1244 goto device_init_failed;
1245 } else
1246 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1247
1248 result = ipoib_dev_init(priv->dev, hca, port);
1249 if (result < 0) {
1250 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1251 hca->name, port, result);
1252 goto device_init_failed;
1253 }
1254
1255 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1256 priv->ca, ipoib_event);
1257 result = ib_register_event_handler(&priv->event_handler);
1258 if (result < 0) {
1259 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1260 "port %d (ret = %d)\n",
1261 hca->name, port, result);
1262 goto event_failed;
1263 }
1264
1265 result = register_netdev(priv->dev);
1266 if (result) {
1267 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1268 hca->name, port, result);
1269 goto register_failed;
1270 }
1271
1272 ipoib_create_debug_files(priv->dev);
1273
1274 if (ipoib_cm_add_mode_attr(priv->dev))
1275 goto sysfs_failed;
1276 if (ipoib_add_pkey_attr(priv->dev))
1277 goto sysfs_failed;
1278 if (ipoib_add_umcast_attr(priv->dev))
1279 goto sysfs_failed;
1280 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1281 goto sysfs_failed;
1282 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1283 goto sysfs_failed;
1284
1285 return priv->dev;
1286
1287sysfs_failed:
1288 ipoib_delete_debug_files(priv->dev);
1289 unregister_netdev(priv->dev);
1290
1291register_failed:
1292 ib_unregister_event_handler(&priv->event_handler);
1293 flush_workqueue(ipoib_workqueue);
1294
1295event_failed:
1296 ipoib_dev_cleanup(priv->dev);
1297
1298device_init_failed:
1299 free_netdev(priv->dev);
1300
1301alloc_mem_failed:
1302 return ERR_PTR(result);
1303}
1304
1305static void ipoib_add_one(struct ib_device *device)
1306{
1307 struct list_head *dev_list;
1308 struct net_device *dev;
1309 struct ipoib_dev_priv *priv;
1310 int s, e, p;
1311
1312 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1313 return;
1314
1315 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1316 if (!dev_list)
1317 return;
1318
1319 INIT_LIST_HEAD(dev_list);
1320
1321 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1322 s = 0;
1323 e = 0;
1324 } else {
1325 s = 1;
1326 e = device->phys_port_cnt;
1327 }
1328
1329 for (p = s; p <= e; ++p) {
1330 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1331 continue;
1332 dev = ipoib_add_port("ib%d", device, p);
1333 if (!IS_ERR(dev)) {
1334 priv = netdev_priv(dev);
1335 list_add_tail(&priv->list, dev_list);
1336 }
1337 }
1338
1339 ib_set_client_data(device, &ipoib_client, dev_list);
1340}
1341
1342static void ipoib_remove_one(struct ib_device *device)
1343{
1344 struct ipoib_dev_priv *priv, *tmp;
1345 struct list_head *dev_list;
1346
1347 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1348 return;
1349
1350 dev_list = ib_get_client_data(device, &ipoib_client);
1351
1352 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1353 ib_unregister_event_handler(&priv->event_handler);
1354
1355 rtnl_lock();
1356 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1357 rtnl_unlock();
1358
1359 flush_workqueue(ipoib_workqueue);
1360
1361 unregister_netdev(priv->dev);
1362 ipoib_dev_cleanup(priv->dev);
1363 free_netdev(priv->dev);
1364 }
1365
1366 kfree(dev_list);
1367}
1368
1369static int __init ipoib_init_module(void)
1370{
1371 int ret;
1372
1373 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1374 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1375 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1376
1377 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1378 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1379 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1380#ifdef CONFIG_INFINIBAND_IPOIB_CM
1381 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1382#endif
1383
1384 /*
1385 * When copying small received packets, we only copy from the
1386 * linear data part of the SKB, so we rely on this condition.
1387 */
1388 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1389
1390 ret = ipoib_register_debugfs();
1391 if (ret)
1392 return ret;
1393
1394 /*
1395 * We create our own workqueue mainly because we want to be
1396 * able to flush it when devices are being removed. We can't
1397 * use schedule_work()/flush_scheduled_work() because both
1398 * unregister_netdev() and linkwatch_event take the rtnl lock,
1399 * so flush_scheduled_work() can deadlock during device
1400 * removal.
1401 */
1402 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1403 if (!ipoib_workqueue) {
1404 ret = -ENOMEM;
1405 goto err_fs;
1406 }
1407
1408 ib_sa_register_client(&ipoib_sa_client);
1409
1410 ret = ib_register_client(&ipoib_client);
1411 if (ret)
1412 goto err_sa;
1413
1414 return 0;
1415
1416err_sa:
1417 ib_sa_unregister_client(&ipoib_sa_client);
1418 destroy_workqueue(ipoib_workqueue);
1419
1420err_fs:
1421 ipoib_unregister_debugfs();
1422
1423 return ret;
1424}
1425
1426static void __exit ipoib_cleanup_module(void)
1427{
1428 ib_unregister_client(&ipoib_client);
1429 ib_sa_unregister_client(&ipoib_sa_client);
1430 ipoib_unregister_debugfs();
1431 destroy_workqueue(ipoib_workqueue);
1432}
1433
1434module_init(ipoib_init_module);
1435module_exit(ipoib_cleanup_module);
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#include <net/addrconf.h>
52#include <linux/inetdevice.h>
53#include <rdma/ib_cache.h>
54
55MODULE_AUTHOR("Roland Dreier");
56MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
57MODULE_LICENSE("Dual BSD/GPL");
58
59int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
60int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
61
62module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
63MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
64module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
65MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
66
67#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
68int ipoib_debug_level;
69
70module_param_named(debug_level, ipoib_debug_level, int, 0644);
71MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
72#endif
73
74struct ipoib_path_iter {
75 struct net_device *dev;
76 struct ipoib_path path;
77};
78
79static const u8 ipv4_bcast_addr[] = {
80 0x00, 0xff, 0xff, 0xff,
81 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
82 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
83};
84
85struct workqueue_struct *ipoib_workqueue;
86
87struct ib_sa_client ipoib_sa_client;
88
89static int ipoib_add_one(struct ib_device *device);
90static void ipoib_remove_one(struct ib_device *device, void *client_data);
91static void ipoib_neigh_reclaim(struct rcu_head *rp);
92static struct net_device *ipoib_get_net_dev_by_params(
93 struct ib_device *dev, u32 port, u16 pkey,
94 const union ib_gid *gid, const struct sockaddr *addr,
95 void *client_data);
96static int ipoib_set_mac(struct net_device *dev, void *addr);
97static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
98 int cmd);
99
100static struct ib_client ipoib_client = {
101 .name = "ipoib",
102 .add = ipoib_add_one,
103 .remove = ipoib_remove_one,
104 .get_net_dev_by_params = ipoib_get_net_dev_by_params,
105};
106
107#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
108static int ipoib_netdev_event(struct notifier_block *this,
109 unsigned long event, void *ptr)
110{
111 struct netdev_notifier_info *ni = ptr;
112 struct net_device *dev = ni->dev;
113
114 if (dev->netdev_ops->ndo_open != ipoib_open)
115 return NOTIFY_DONE;
116
117 switch (event) {
118 case NETDEV_REGISTER:
119 ipoib_create_debug_files(dev);
120 break;
121 case NETDEV_CHANGENAME:
122 ipoib_delete_debug_files(dev);
123 ipoib_create_debug_files(dev);
124 break;
125 case NETDEV_UNREGISTER:
126 ipoib_delete_debug_files(dev);
127 break;
128 }
129
130 return NOTIFY_DONE;
131}
132#endif
133
134int ipoib_open(struct net_device *dev)
135{
136 struct ipoib_dev_priv *priv = ipoib_priv(dev);
137
138 ipoib_dbg(priv, "bringing up interface\n");
139
140 netif_carrier_off(dev);
141
142 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
143
144 if (ipoib_ib_dev_open(dev)) {
145 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
146 return 0;
147 goto err_disable;
148 }
149
150 ipoib_ib_dev_up(dev);
151
152 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
153 struct ipoib_dev_priv *cpriv;
154
155 /* Bring up any child interfaces too */
156 down_read(&priv->vlan_rwsem);
157 list_for_each_entry(cpriv, &priv->child_intfs, list) {
158 int flags;
159
160 flags = cpriv->dev->flags;
161 if (flags & IFF_UP)
162 continue;
163
164 dev_change_flags(cpriv->dev, flags | IFF_UP, NULL);
165 }
166 up_read(&priv->vlan_rwsem);
167 } else if (priv->parent) {
168 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
169
170 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &ppriv->flags))
171 ipoib_dbg(priv, "parent device %s is not up, so child device may be not functioning.\n",
172 ppriv->dev->name);
173 }
174 netif_start_queue(dev);
175
176 return 0;
177
178err_disable:
179 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
180
181 return -EINVAL;
182}
183
184static int ipoib_stop(struct net_device *dev)
185{
186 struct ipoib_dev_priv *priv = ipoib_priv(dev);
187
188 ipoib_dbg(priv, "stopping interface\n");
189
190 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
191
192 netif_stop_queue(dev);
193
194 ipoib_ib_dev_down(dev);
195 ipoib_ib_dev_stop(dev);
196
197 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
198 struct ipoib_dev_priv *cpriv;
199
200 /* Bring down any child interfaces too */
201 down_read(&priv->vlan_rwsem);
202 list_for_each_entry(cpriv, &priv->child_intfs, list) {
203 int flags;
204
205 flags = cpriv->dev->flags;
206 if (!(flags & IFF_UP))
207 continue;
208
209 dev_change_flags(cpriv->dev, flags & ~IFF_UP, NULL);
210 }
211 up_read(&priv->vlan_rwsem);
212 }
213
214 return 0;
215}
216
217static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
218{
219 struct ipoib_dev_priv *priv = ipoib_priv(dev);
220
221 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
222 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
223
224 return features;
225}
226
227static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
228{
229 struct ipoib_dev_priv *priv = ipoib_priv(dev);
230 int ret = 0;
231
232 /* dev->mtu > 2K ==> connected mode */
233 if (ipoib_cm_admin_enabled(dev)) {
234 if (new_mtu > ipoib_cm_max_mtu(dev))
235 return -EINVAL;
236
237 if (new_mtu > priv->mcast_mtu)
238 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
239 priv->mcast_mtu);
240
241 dev->mtu = new_mtu;
242 return 0;
243 }
244
245 if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) ||
246 new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
247 return -EINVAL;
248
249 priv->admin_mtu = new_mtu;
250
251 if (priv->mcast_mtu < priv->admin_mtu)
252 ipoib_dbg(priv, "MTU must be smaller than the underlying "
253 "link layer MTU - 4 (%u)\n", priv->mcast_mtu);
254
255 new_mtu = min(priv->mcast_mtu, priv->admin_mtu);
256
257 if (priv->rn_ops->ndo_change_mtu) {
258 bool carrier_status = netif_carrier_ok(dev);
259
260 netif_carrier_off(dev);
261
262 /* notify lower level on the real mtu */
263 ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu);
264
265 if (carrier_status)
266 netif_carrier_on(dev);
267 } else {
268 dev->mtu = new_mtu;
269 }
270
271 return ret;
272}
273
274static void ipoib_get_stats(struct net_device *dev,
275 struct rtnl_link_stats64 *stats)
276{
277 struct ipoib_dev_priv *priv = ipoib_priv(dev);
278
279 if (priv->rn_ops->ndo_get_stats64)
280 priv->rn_ops->ndo_get_stats64(dev, stats);
281 else
282 netdev_stats_to_stats64(stats, &dev->stats);
283}
284
285/* Called with an RCU read lock taken */
286static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
287 struct net_device *dev)
288{
289 struct net *net = dev_net(dev);
290 struct in_device *in_dev;
291 struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
292 struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
293 __be32 ret_addr;
294
295 switch (addr->sa_family) {
296 case AF_INET:
297 in_dev = in_dev_get(dev);
298 if (!in_dev)
299 return false;
300
301 ret_addr = inet_confirm_addr(net, in_dev, 0,
302 addr_in->sin_addr.s_addr,
303 RT_SCOPE_HOST);
304 in_dev_put(in_dev);
305 if (ret_addr)
306 return true;
307
308 break;
309 case AF_INET6:
310 if (IS_ENABLED(CONFIG_IPV6) &&
311 ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
312 return true;
313
314 break;
315 }
316 return false;
317}
318
319/*
320 * Find the master net_device on top of the given net_device.
321 * @dev: base IPoIB net_device
322 *
323 * Returns the master net_device with a reference held, or the same net_device
324 * if no master exists.
325 */
326static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
327{
328 struct net_device *master;
329
330 rcu_read_lock();
331 master = netdev_master_upper_dev_get_rcu(dev);
332 if (master)
333 dev_hold(master);
334 rcu_read_unlock();
335
336 if (master)
337 return master;
338
339 dev_hold(dev);
340 return dev;
341}
342
343struct ipoib_walk_data {
344 const struct sockaddr *addr;
345 struct net_device *result;
346};
347
348static int ipoib_upper_walk(struct net_device *upper,
349 struct netdev_nested_priv *priv)
350{
351 struct ipoib_walk_data *data = (struct ipoib_walk_data *)priv->data;
352 int ret = 0;
353
354 if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) {
355 dev_hold(upper);
356 data->result = upper;
357 ret = 1;
358 }
359
360 return ret;
361}
362
363/**
364 * ipoib_get_net_dev_match_addr - Find a net_device matching
365 * the given address, which is an upper device of the given net_device.
366 *
367 * @addr: IP address to look for.
368 * @dev: base IPoIB net_device
369 *
370 * If found, returns the net_device with a reference held. Otherwise return
371 * NULL.
372 */
373static struct net_device *ipoib_get_net_dev_match_addr(
374 const struct sockaddr *addr, struct net_device *dev)
375{
376 struct netdev_nested_priv priv;
377 struct ipoib_walk_data data = {
378 .addr = addr,
379 };
380
381 priv.data = (void *)&data;
382 rcu_read_lock();
383 if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
384 dev_hold(dev);
385 data.result = dev;
386 goto out;
387 }
388
389 netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &priv);
390out:
391 rcu_read_unlock();
392 return data.result;
393}
394
395/* returns the number of IPoIB netdevs on top a given ipoib device matching a
396 * pkey_index and address, if one exists.
397 *
398 * @found_net_dev: contains a matching net_device if the return value >= 1,
399 * with a reference held. */
400static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
401 const union ib_gid *gid,
402 u16 pkey_index,
403 const struct sockaddr *addr,
404 int nesting,
405 struct net_device **found_net_dev)
406{
407 struct ipoib_dev_priv *child_priv;
408 struct net_device *net_dev = NULL;
409 int matches = 0;
410
411 if (priv->pkey_index == pkey_index &&
412 (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
413 if (!addr) {
414 net_dev = ipoib_get_master_net_dev(priv->dev);
415 } else {
416 /* Verify the net_device matches the IP address, as
417 * IPoIB child devices currently share a GID. */
418 net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
419 }
420 if (net_dev) {
421 if (!*found_net_dev)
422 *found_net_dev = net_dev;
423 else
424 dev_put(net_dev);
425 ++matches;
426 }
427 }
428
429 /* Check child interfaces */
430 down_read_nested(&priv->vlan_rwsem, nesting);
431 list_for_each_entry(child_priv, &priv->child_intfs, list) {
432 matches += ipoib_match_gid_pkey_addr(child_priv, gid,
433 pkey_index, addr,
434 nesting + 1,
435 found_net_dev);
436 if (matches > 1)
437 break;
438 }
439 up_read(&priv->vlan_rwsem);
440
441 return matches;
442}
443
444/* Returns the number of matching net_devs found (between 0 and 2). Also
445 * return the matching net_device in the @net_dev parameter, holding a
446 * reference to the net_device, if the number of matches >= 1 */
447static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u32 port,
448 u16 pkey_index,
449 const union ib_gid *gid,
450 const struct sockaddr *addr,
451 struct net_device **net_dev)
452{
453 struct ipoib_dev_priv *priv;
454 int matches = 0;
455
456 *net_dev = NULL;
457
458 list_for_each_entry(priv, dev_list, list) {
459 if (priv->port != port)
460 continue;
461
462 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
463 addr, 0, net_dev);
464 if (matches > 1)
465 break;
466 }
467
468 return matches;
469}
470
471static struct net_device *ipoib_get_net_dev_by_params(
472 struct ib_device *dev, u32 port, u16 pkey,
473 const union ib_gid *gid, const struct sockaddr *addr,
474 void *client_data)
475{
476 struct net_device *net_dev;
477 struct list_head *dev_list = client_data;
478 u16 pkey_index;
479 int matches;
480 int ret;
481
482 if (!rdma_protocol_ib(dev, port))
483 return NULL;
484
485 ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
486 if (ret)
487 return NULL;
488
489 /* See if we can find a unique device matching the L2 parameters */
490 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
491 gid, NULL, &net_dev);
492
493 switch (matches) {
494 case 0:
495 return NULL;
496 case 1:
497 return net_dev;
498 }
499
500 dev_put(net_dev);
501
502 /* Couldn't find a unique device with L2 parameters only. Use L3
503 * address to uniquely match the net device */
504 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
505 gid, addr, &net_dev);
506 switch (matches) {
507 case 0:
508 return NULL;
509 default:
510 dev_warn_ratelimited(&dev->dev,
511 "duplicate IP address detected\n");
512 fallthrough;
513 case 1:
514 return net_dev;
515 }
516}
517
518int ipoib_set_mode(struct net_device *dev, const char *buf)
519{
520 struct ipoib_dev_priv *priv = ipoib_priv(dev);
521
522 if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
523 !strcmp(buf, "connected\n")) ||
524 (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
525 !strcmp(buf, "datagram\n"))) {
526 return 0;
527 }
528
529 /* flush paths if we switch modes so that connections are restarted */
530 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
531 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
532 ipoib_warn(priv, "enabling connected mode "
533 "will cause multicast packet drops\n");
534 netdev_update_features(dev);
535 dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
536 netif_set_real_num_tx_queues(dev, 1);
537 rtnl_unlock();
538 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
539
540 ipoib_flush_paths(dev);
541 return (!rtnl_trylock()) ? -EBUSY : 0;
542 }
543
544 if (!strcmp(buf, "datagram\n")) {
545 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
546 netdev_update_features(dev);
547 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
548 netif_set_real_num_tx_queues(dev, dev->num_tx_queues);
549 rtnl_unlock();
550 ipoib_flush_paths(dev);
551 return (!rtnl_trylock()) ? -EBUSY : 0;
552 }
553
554 return -EINVAL;
555}
556
557struct ipoib_path *__path_find(struct net_device *dev, void *gid)
558{
559 struct ipoib_dev_priv *priv = ipoib_priv(dev);
560 struct rb_node *n = priv->path_tree.rb_node;
561 struct ipoib_path *path;
562 int ret;
563
564 while (n) {
565 path = rb_entry(n, struct ipoib_path, rb_node);
566
567 ret = memcmp(gid, path->pathrec.dgid.raw,
568 sizeof (union ib_gid));
569
570 if (ret < 0)
571 n = n->rb_left;
572 else if (ret > 0)
573 n = n->rb_right;
574 else
575 return path;
576 }
577
578 return NULL;
579}
580
581static int __path_add(struct net_device *dev, struct ipoib_path *path)
582{
583 struct ipoib_dev_priv *priv = ipoib_priv(dev);
584 struct rb_node **n = &priv->path_tree.rb_node;
585 struct rb_node *pn = NULL;
586 struct ipoib_path *tpath;
587 int ret;
588
589 while (*n) {
590 pn = *n;
591 tpath = rb_entry(pn, struct ipoib_path, rb_node);
592
593 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
594 sizeof (union ib_gid));
595 if (ret < 0)
596 n = &pn->rb_left;
597 else if (ret > 0)
598 n = &pn->rb_right;
599 else
600 return -EEXIST;
601 }
602
603 rb_link_node(&path->rb_node, pn, n);
604 rb_insert_color(&path->rb_node, &priv->path_tree);
605
606 list_add_tail(&path->list, &priv->path_list);
607
608 return 0;
609}
610
611static void path_free(struct net_device *dev, struct ipoib_path *path)
612{
613 struct sk_buff *skb;
614
615 while ((skb = __skb_dequeue(&path->queue)))
616 dev_kfree_skb_irq(skb);
617
618 ipoib_dbg(ipoib_priv(dev), "%s\n", __func__);
619
620 /* remove all neigh connected to this path */
621 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
622
623 if (path->ah)
624 ipoib_put_ah(path->ah);
625
626 kfree(path);
627}
628
629#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
630
631struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
632{
633 struct ipoib_path_iter *iter;
634
635 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
636 if (!iter)
637 return NULL;
638
639 iter->dev = dev;
640 memset(iter->path.pathrec.dgid.raw, 0, 16);
641
642 if (ipoib_path_iter_next(iter)) {
643 kfree(iter);
644 return NULL;
645 }
646
647 return iter;
648}
649
650int ipoib_path_iter_next(struct ipoib_path_iter *iter)
651{
652 struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
653 struct rb_node *n;
654 struct ipoib_path *path;
655 int ret = 1;
656
657 spin_lock_irq(&priv->lock);
658
659 n = rb_first(&priv->path_tree);
660
661 while (n) {
662 path = rb_entry(n, struct ipoib_path, rb_node);
663
664 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
665 sizeof (union ib_gid)) < 0) {
666 iter->path = *path;
667 ret = 0;
668 break;
669 }
670
671 n = rb_next(n);
672 }
673
674 spin_unlock_irq(&priv->lock);
675
676 return ret;
677}
678
679void ipoib_path_iter_read(struct ipoib_path_iter *iter,
680 struct ipoib_path *path)
681{
682 *path = iter->path;
683}
684
685#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
686
687void ipoib_mark_paths_invalid(struct net_device *dev)
688{
689 struct ipoib_dev_priv *priv = ipoib_priv(dev);
690 struct ipoib_path *path, *tp;
691
692 spin_lock_irq(&priv->lock);
693
694 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
695 ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n",
696 be32_to_cpu(sa_path_get_dlid(&path->pathrec)),
697 path->pathrec.dgid.raw);
698 if (path->ah)
699 path->ah->valid = 0;
700 }
701
702 spin_unlock_irq(&priv->lock);
703}
704
705static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
706{
707 struct ipoib_pseudo_header *phdr;
708
709 phdr = skb_push(skb, sizeof(*phdr));
710 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
711}
712
713void ipoib_flush_paths(struct net_device *dev)
714{
715 struct ipoib_dev_priv *priv = ipoib_priv(dev);
716 struct ipoib_path *path, *tp;
717 LIST_HEAD(remove_list);
718 unsigned long flags;
719
720 netif_tx_lock_bh(dev);
721 spin_lock_irqsave(&priv->lock, flags);
722
723 list_splice_init(&priv->path_list, &remove_list);
724
725 list_for_each_entry(path, &remove_list, list)
726 rb_erase(&path->rb_node, &priv->path_tree);
727
728 list_for_each_entry_safe(path, tp, &remove_list, list) {
729 if (path->query)
730 ib_sa_cancel_query(path->query_id, path->query);
731 spin_unlock_irqrestore(&priv->lock, flags);
732 netif_tx_unlock_bh(dev);
733 wait_for_completion(&path->done);
734 path_free(dev, path);
735 netif_tx_lock_bh(dev);
736 spin_lock_irqsave(&priv->lock, flags);
737 }
738
739 spin_unlock_irqrestore(&priv->lock, flags);
740 netif_tx_unlock_bh(dev);
741}
742
743static void path_rec_completion(int status,
744 struct sa_path_rec *pathrec,
745 int num_prs, void *path_ptr)
746{
747 struct ipoib_path *path = path_ptr;
748 struct net_device *dev = path->dev;
749 struct ipoib_dev_priv *priv = ipoib_priv(dev);
750 struct ipoib_ah *ah = NULL;
751 struct ipoib_ah *old_ah = NULL;
752 struct ipoib_neigh *neigh, *tn;
753 struct sk_buff_head skqueue;
754 struct sk_buff *skb;
755 unsigned long flags;
756
757 if (!status)
758 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
759 be32_to_cpu(sa_path_get_dlid(pathrec)),
760 pathrec->dgid.raw);
761 else
762 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
763 status, path->pathrec.dgid.raw);
764
765 skb_queue_head_init(&skqueue);
766
767 if (!status) {
768 struct rdma_ah_attr av;
769
770 if (!ib_init_ah_attr_from_path(priv->ca, priv->port,
771 pathrec, &av, NULL)) {
772 ah = ipoib_create_ah(dev, priv->pd, &av);
773 rdma_destroy_ah_attr(&av);
774 }
775 }
776
777 spin_lock_irqsave(&priv->lock, flags);
778
779 if (!IS_ERR_OR_NULL(ah)) {
780 /*
781 * pathrec.dgid is used as the database key from the LLADDR,
782 * it must remain unchanged even if the SA returns a different
783 * GID to use in the AH.
784 */
785 if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw,
786 sizeof(union ib_gid))) {
787 ipoib_dbg(
788 priv,
789 "%s got PathRec for gid %pI6 while asked for %pI6\n",
790 dev->name, pathrec->dgid.raw,
791 path->pathrec.dgid.raw);
792 memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw,
793 sizeof(union ib_gid));
794 }
795
796 path->pathrec = *pathrec;
797
798 old_ah = path->ah;
799 path->ah = ah;
800
801 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
802 ah, be32_to_cpu(sa_path_get_dlid(pathrec)),
803 pathrec->sl);
804
805 while ((skb = __skb_dequeue(&path->queue)))
806 __skb_queue_tail(&skqueue, skb);
807
808 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
809 if (neigh->ah) {
810 WARN_ON(neigh->ah != old_ah);
811 /*
812 * Dropping the ah reference inside
813 * priv->lock is safe here, because we
814 * will hold one more reference from
815 * the original value of path->ah (ie
816 * old_ah).
817 */
818 ipoib_put_ah(neigh->ah);
819 }
820 kref_get(&path->ah->ref);
821 neigh->ah = path->ah;
822
823 if (ipoib_cm_enabled(dev, neigh->daddr)) {
824 if (!ipoib_cm_get(neigh))
825 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
826 path,
827 neigh));
828 if (!ipoib_cm_get(neigh)) {
829 ipoib_neigh_free(neigh);
830 continue;
831 }
832 }
833
834 while ((skb = __skb_dequeue(&neigh->queue)))
835 __skb_queue_tail(&skqueue, skb);
836 }
837 path->ah->valid = 1;
838 }
839
840 path->query = NULL;
841 complete(&path->done);
842
843 spin_unlock_irqrestore(&priv->lock, flags);
844
845 if (IS_ERR_OR_NULL(ah))
846 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
847
848 if (old_ah)
849 ipoib_put_ah(old_ah);
850
851 while ((skb = __skb_dequeue(&skqueue))) {
852 int ret;
853 skb->dev = dev;
854 ret = dev_queue_xmit(skb);
855 if (ret)
856 ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n",
857 __func__, ret);
858 }
859}
860
861static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path,
862 void *gid)
863{
864 path->dev = priv->dev;
865
866 if (rdma_cap_opa_ah(priv->ca, priv->port))
867 path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA;
868 else
869 path->pathrec.rec_type = SA_PATH_REC_TYPE_IB;
870
871 memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid));
872 path->pathrec.sgid = priv->local_gid;
873 path->pathrec.pkey = cpu_to_be16(priv->pkey);
874 path->pathrec.numb_path = 1;
875 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
876}
877
878static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
879{
880 struct ipoib_dev_priv *priv = ipoib_priv(dev);
881 struct ipoib_path *path;
882
883 if (!priv->broadcast)
884 return NULL;
885
886 path = kzalloc(sizeof(*path), GFP_ATOMIC);
887 if (!path)
888 return NULL;
889
890 skb_queue_head_init(&path->queue);
891
892 INIT_LIST_HEAD(&path->neigh_list);
893
894 init_path_rec(priv, path, gid);
895
896 return path;
897}
898
899static int path_rec_start(struct net_device *dev,
900 struct ipoib_path *path)
901{
902 struct ipoib_dev_priv *priv = ipoib_priv(dev);
903
904 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
905 path->pathrec.dgid.raw);
906
907 init_completion(&path->done);
908
909 path->query_id =
910 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
911 &path->pathrec,
912 IB_SA_PATH_REC_DGID |
913 IB_SA_PATH_REC_SGID |
914 IB_SA_PATH_REC_NUMB_PATH |
915 IB_SA_PATH_REC_TRAFFIC_CLASS |
916 IB_SA_PATH_REC_PKEY,
917 1000, GFP_ATOMIC,
918 path_rec_completion,
919 path, &path->query);
920 if (path->query_id < 0) {
921 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
922 path->query = NULL;
923 complete(&path->done);
924 return path->query_id;
925 }
926
927 return 0;
928}
929
930static void neigh_refresh_path(struct ipoib_neigh *neigh, u8 *daddr,
931 struct net_device *dev)
932{
933 struct ipoib_dev_priv *priv = ipoib_priv(dev);
934 struct ipoib_path *path;
935 unsigned long flags;
936
937 spin_lock_irqsave(&priv->lock, flags);
938
939 path = __path_find(dev, daddr + 4);
940 if (!path)
941 goto out;
942 if (!path->query)
943 path_rec_start(dev, path);
944out:
945 spin_unlock_irqrestore(&priv->lock, flags);
946}
947
948static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr,
949 struct net_device *dev)
950{
951 struct ipoib_dev_priv *priv = ipoib_priv(dev);
952 struct rdma_netdev *rn = netdev_priv(dev);
953 struct ipoib_path *path;
954 struct ipoib_neigh *neigh;
955 unsigned long flags;
956
957 spin_lock_irqsave(&priv->lock, flags);
958 neigh = ipoib_neigh_alloc(daddr, dev);
959 if (!neigh) {
960 spin_unlock_irqrestore(&priv->lock, flags);
961 ++dev->stats.tx_dropped;
962 dev_kfree_skb_any(skb);
963 return NULL;
964 }
965
966 /* To avoid race condition, make sure that the
967 * neigh will be added only once.
968 */
969 if (unlikely(!list_empty(&neigh->list))) {
970 spin_unlock_irqrestore(&priv->lock, flags);
971 return neigh;
972 }
973
974 path = __path_find(dev, daddr + 4);
975 if (!path) {
976 path = path_rec_create(dev, daddr + 4);
977 if (!path)
978 goto err_path;
979
980 __path_add(dev, path);
981 }
982
983 list_add_tail(&neigh->list, &path->neigh_list);
984
985 if (path->ah && path->ah->valid) {
986 kref_get(&path->ah->ref);
987 neigh->ah = path->ah;
988
989 if (ipoib_cm_enabled(dev, neigh->daddr)) {
990 if (!ipoib_cm_get(neigh))
991 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
992 if (!ipoib_cm_get(neigh)) {
993 ipoib_neigh_free(neigh);
994 goto err_drop;
995 }
996 if (skb_queue_len(&neigh->queue) <
997 IPOIB_MAX_PATH_REC_QUEUE) {
998 push_pseudo_header(skb, neigh->daddr);
999 __skb_queue_tail(&neigh->queue, skb);
1000 } else {
1001 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
1002 skb_queue_len(&neigh->queue));
1003 goto err_drop;
1004 }
1005 } else {
1006 spin_unlock_irqrestore(&priv->lock, flags);
1007 path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1008 IPOIB_QPN(daddr));
1009 ipoib_neigh_put(neigh);
1010 return NULL;
1011 }
1012 } else {
1013 neigh->ah = NULL;
1014
1015 if (!path->query && path_rec_start(dev, path))
1016 goto err_path;
1017 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1018 push_pseudo_header(skb, neigh->daddr);
1019 __skb_queue_tail(&neigh->queue, skb);
1020 } else {
1021 goto err_drop;
1022 }
1023 }
1024
1025 spin_unlock_irqrestore(&priv->lock, flags);
1026 ipoib_neigh_put(neigh);
1027 return NULL;
1028
1029err_path:
1030 ipoib_neigh_free(neigh);
1031err_drop:
1032 ++dev->stats.tx_dropped;
1033 dev_kfree_skb_any(skb);
1034
1035 spin_unlock_irqrestore(&priv->lock, flags);
1036 ipoib_neigh_put(neigh);
1037
1038 return NULL;
1039}
1040
1041static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
1042 struct ipoib_pseudo_header *phdr)
1043{
1044 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1045 struct rdma_netdev *rn = netdev_priv(dev);
1046 struct ipoib_path *path;
1047 unsigned long flags;
1048
1049 spin_lock_irqsave(&priv->lock, flags);
1050
1051 /* no broadcast means that all paths are (going to be) not valid */
1052 if (!priv->broadcast)
1053 goto drop_and_unlock;
1054
1055 path = __path_find(dev, phdr->hwaddr + 4);
1056 if (!path || !path->ah || !path->ah->valid) {
1057 if (!path) {
1058 path = path_rec_create(dev, phdr->hwaddr + 4);
1059 if (!path)
1060 goto drop_and_unlock;
1061 __path_add(dev, path);
1062 } else {
1063 /*
1064 * make sure there are no changes in the existing
1065 * path record
1066 */
1067 init_path_rec(priv, path, phdr->hwaddr + 4);
1068 }
1069 if (!path->query && path_rec_start(dev, path)) {
1070 goto drop_and_unlock;
1071 }
1072
1073 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1074 push_pseudo_header(skb, phdr->hwaddr);
1075 __skb_queue_tail(&path->queue, skb);
1076 goto unlock;
1077 } else {
1078 goto drop_and_unlock;
1079 }
1080 }
1081
1082 spin_unlock_irqrestore(&priv->lock, flags);
1083 ipoib_dbg(priv, "Send unicast ARP to %08x\n",
1084 be32_to_cpu(sa_path_get_dlid(&path->pathrec)));
1085 path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1086 IPOIB_QPN(phdr->hwaddr));
1087 return;
1088
1089drop_and_unlock:
1090 ++dev->stats.tx_dropped;
1091 dev_kfree_skb_any(skb);
1092unlock:
1093 spin_unlock_irqrestore(&priv->lock, flags);
1094}
1095
1096static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
1097{
1098 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1099 struct rdma_netdev *rn = netdev_priv(dev);
1100 struct ipoib_neigh *neigh;
1101 struct ipoib_pseudo_header *phdr;
1102 struct ipoib_header *header;
1103 unsigned long flags;
1104
1105 phdr = (struct ipoib_pseudo_header *) skb->data;
1106 skb_pull(skb, sizeof(*phdr));
1107 header = (struct ipoib_header *) skb->data;
1108
1109 if (unlikely(phdr->hwaddr[4] == 0xff)) {
1110 /* multicast, arrange "if" according to probability */
1111 if ((header->proto != htons(ETH_P_IP)) &&
1112 (header->proto != htons(ETH_P_IPV6)) &&
1113 (header->proto != htons(ETH_P_ARP)) &&
1114 (header->proto != htons(ETH_P_RARP)) &&
1115 (header->proto != htons(ETH_P_TIPC))) {
1116 /* ethertype not supported by IPoIB */
1117 ++dev->stats.tx_dropped;
1118 dev_kfree_skb_any(skb);
1119 return NETDEV_TX_OK;
1120 }
1121 /* Add in the P_Key for multicast*/
1122 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
1123 phdr->hwaddr[9] = priv->pkey & 0xff;
1124
1125 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1126 if (likely(neigh))
1127 goto send_using_neigh;
1128 ipoib_mcast_send(dev, phdr->hwaddr, skb);
1129 return NETDEV_TX_OK;
1130 }
1131
1132 /* unicast, arrange "switch" according to probability */
1133 switch (header->proto) {
1134 case htons(ETH_P_IP):
1135 case htons(ETH_P_IPV6):
1136 case htons(ETH_P_TIPC):
1137 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1138 if (unlikely(!neigh)) {
1139 neigh = neigh_add_path(skb, phdr->hwaddr, dev);
1140 if (likely(!neigh))
1141 return NETDEV_TX_OK;
1142 }
1143 break;
1144 case htons(ETH_P_ARP):
1145 case htons(ETH_P_RARP):
1146 /* for unicast ARP and RARP should always perform path find */
1147 unicast_arp_send(skb, dev, phdr);
1148 return NETDEV_TX_OK;
1149 default:
1150 /* ethertype not supported by IPoIB */
1151 ++dev->stats.tx_dropped;
1152 dev_kfree_skb_any(skb);
1153 return NETDEV_TX_OK;
1154 }
1155
1156send_using_neigh:
1157 /* note we now hold a ref to neigh */
1158 if (ipoib_cm_get(neigh)) {
1159 if (ipoib_cm_up(neigh)) {
1160 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1161 goto unref;
1162 }
1163 } else if (neigh->ah && neigh->ah->valid) {
1164 neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah,
1165 IPOIB_QPN(phdr->hwaddr));
1166 goto unref;
1167 } else if (neigh->ah) {
1168 neigh_refresh_path(neigh, phdr->hwaddr, dev);
1169 }
1170
1171 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1172 push_pseudo_header(skb, phdr->hwaddr);
1173 spin_lock_irqsave(&priv->lock, flags);
1174 __skb_queue_tail(&neigh->queue, skb);
1175 spin_unlock_irqrestore(&priv->lock, flags);
1176 } else {
1177 ++dev->stats.tx_dropped;
1178 dev_kfree_skb_any(skb);
1179 }
1180
1181unref:
1182 ipoib_neigh_put(neigh);
1183
1184 return NETDEV_TX_OK;
1185}
1186
1187static void ipoib_timeout(struct net_device *dev, unsigned int txqueue)
1188{
1189 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1190 struct rdma_netdev *rn = netdev_priv(dev);
1191
1192 if (rn->tx_timeout) {
1193 rn->tx_timeout(dev, txqueue);
1194 return;
1195 }
1196 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1197 jiffies_to_msecs(jiffies - dev_trans_start(dev)));
1198 ipoib_warn(priv,
1199 "queue stopped %d, tx_head %u, tx_tail %u, global_tx_head %u, global_tx_tail %u\n",
1200 netif_queue_stopped(dev), priv->tx_head, priv->tx_tail,
1201 priv->global_tx_head, priv->global_tx_tail);
1202
1203 /* XXX reset QP, etc. */
1204}
1205
1206static int ipoib_hard_header(struct sk_buff *skb,
1207 struct net_device *dev,
1208 unsigned short type,
1209 const void *daddr,
1210 const void *saddr,
1211 unsigned int len)
1212{
1213 struct ipoib_header *header;
1214
1215 header = skb_push(skb, sizeof(*header));
1216
1217 header->proto = htons(type);
1218 header->reserved = 0;
1219
1220 /*
1221 * we don't rely on dst_entry structure, always stuff the
1222 * destination address into skb hard header so we can figure out where
1223 * to send the packet later.
1224 */
1225 push_pseudo_header(skb, daddr);
1226
1227 return IPOIB_HARD_LEN;
1228}
1229
1230static void ipoib_set_mcast_list(struct net_device *dev)
1231{
1232 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1233
1234 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1235 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1236 return;
1237 }
1238
1239 queue_work(priv->wq, &priv->restart_task);
1240}
1241
1242static int ipoib_get_iflink(const struct net_device *dev)
1243{
1244 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1245
1246 /* parent interface */
1247 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1248 return dev->ifindex;
1249
1250 /* child/vlan interface */
1251 return priv->parent->ifindex;
1252}
1253
1254static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1255{
1256 /*
1257 * Use only the address parts that contributes to spreading
1258 * The subnet prefix is not used as one can not connect to
1259 * same remote port (GUID) using the same remote QPN via two
1260 * different subnets.
1261 */
1262 /* qpn octets[1:4) & port GUID octets[12:20) */
1263 u32 *d32 = (u32 *) daddr;
1264 u32 hv;
1265
1266 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1267 return hv & htbl->mask;
1268}
1269
1270struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1271{
1272 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1273 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1274 struct ipoib_neigh_hash *htbl;
1275 struct ipoib_neigh *neigh = NULL;
1276 u32 hash_val;
1277
1278 rcu_read_lock_bh();
1279
1280 htbl = rcu_dereference_bh(ntbl->htbl);
1281
1282 if (!htbl)
1283 goto out_unlock;
1284
1285 hash_val = ipoib_addr_hash(htbl, daddr);
1286 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1287 neigh != NULL;
1288 neigh = rcu_dereference_bh(neigh->hnext)) {
1289 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1290 /* found, take one ref on behalf of the caller */
1291 if (!refcount_inc_not_zero(&neigh->refcnt)) {
1292 /* deleted */
1293 neigh = NULL;
1294 goto out_unlock;
1295 }
1296
1297 if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
1298 neigh->alive = jiffies;
1299 goto out_unlock;
1300 }
1301 }
1302
1303out_unlock:
1304 rcu_read_unlock_bh();
1305 return neigh;
1306}
1307
1308static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1309{
1310 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1311 struct ipoib_neigh_hash *htbl;
1312 unsigned long neigh_obsolete;
1313 unsigned long dt;
1314 unsigned long flags;
1315 int i;
1316 LIST_HEAD(remove_list);
1317
1318 spin_lock_irqsave(&priv->lock, flags);
1319
1320 htbl = rcu_dereference_protected(ntbl->htbl,
1321 lockdep_is_held(&priv->lock));
1322
1323 if (!htbl)
1324 goto out_unlock;
1325
1326 /* neigh is obsolete if it was idle for two GC periods */
1327 dt = 2 * arp_tbl.gc_interval;
1328 neigh_obsolete = jiffies - dt;
1329
1330 for (i = 0; i < htbl->size; i++) {
1331 struct ipoib_neigh *neigh;
1332 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1333
1334 while ((neigh = rcu_dereference_protected(*np,
1335 lockdep_is_held(&priv->lock))) != NULL) {
1336 /* was the neigh idle for two GC periods */
1337 if (time_after(neigh_obsolete, neigh->alive)) {
1338
1339 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1340
1341 rcu_assign_pointer(*np,
1342 rcu_dereference_protected(neigh->hnext,
1343 lockdep_is_held(&priv->lock)));
1344 /* remove from path/mc list */
1345 list_del_init(&neigh->list);
1346 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1347 } else {
1348 np = &neigh->hnext;
1349 }
1350
1351 }
1352 }
1353
1354out_unlock:
1355 spin_unlock_irqrestore(&priv->lock, flags);
1356 ipoib_mcast_remove_list(&remove_list);
1357}
1358
1359static void ipoib_reap_neigh(struct work_struct *work)
1360{
1361 struct ipoib_dev_priv *priv =
1362 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1363
1364 __ipoib_reap_neigh(priv);
1365
1366 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1367 arp_tbl.gc_interval);
1368}
1369
1370
1371static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1372 struct net_device *dev)
1373{
1374 struct ipoib_neigh *neigh;
1375
1376 neigh = kzalloc(sizeof(*neigh), GFP_ATOMIC);
1377 if (!neigh)
1378 return NULL;
1379
1380 neigh->dev = dev;
1381 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1382 skb_queue_head_init(&neigh->queue);
1383 INIT_LIST_HEAD(&neigh->list);
1384 ipoib_cm_set(neigh, NULL);
1385 /* one ref on behalf of the caller */
1386 refcount_set(&neigh->refcnt, 1);
1387
1388 return neigh;
1389}
1390
1391struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1392 struct net_device *dev)
1393{
1394 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1395 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1396 struct ipoib_neigh_hash *htbl;
1397 struct ipoib_neigh *neigh;
1398 u32 hash_val;
1399
1400 htbl = rcu_dereference_protected(ntbl->htbl,
1401 lockdep_is_held(&priv->lock));
1402 if (!htbl) {
1403 neigh = NULL;
1404 goto out_unlock;
1405 }
1406
1407 /* need to add a new neigh, but maybe some other thread succeeded?
1408 * recalc hash, maybe hash resize took place so we do a search
1409 */
1410 hash_val = ipoib_addr_hash(htbl, daddr);
1411 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1412 lockdep_is_held(&priv->lock));
1413 neigh != NULL;
1414 neigh = rcu_dereference_protected(neigh->hnext,
1415 lockdep_is_held(&priv->lock))) {
1416 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1417 /* found, take one ref on behalf of the caller */
1418 if (!refcount_inc_not_zero(&neigh->refcnt)) {
1419 /* deleted */
1420 neigh = NULL;
1421 break;
1422 }
1423 neigh->alive = jiffies;
1424 goto out_unlock;
1425 }
1426 }
1427
1428 neigh = ipoib_neigh_ctor(daddr, dev);
1429 if (!neigh)
1430 goto out_unlock;
1431
1432 /* one ref on behalf of the hash table */
1433 refcount_inc(&neigh->refcnt);
1434 neigh->alive = jiffies;
1435 /* put in hash */
1436 rcu_assign_pointer(neigh->hnext,
1437 rcu_dereference_protected(htbl->buckets[hash_val],
1438 lockdep_is_held(&priv->lock)));
1439 rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1440 atomic_inc(&ntbl->entries);
1441
1442out_unlock:
1443
1444 return neigh;
1445}
1446
1447void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1448{
1449 /* neigh reference count was dropprd to zero */
1450 struct net_device *dev = neigh->dev;
1451 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1452 struct sk_buff *skb;
1453 if (neigh->ah)
1454 ipoib_put_ah(neigh->ah);
1455 while ((skb = __skb_dequeue(&neigh->queue))) {
1456 ++dev->stats.tx_dropped;
1457 dev_kfree_skb_any(skb);
1458 }
1459 if (ipoib_cm_get(neigh))
1460 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1461 ipoib_dbg(ipoib_priv(dev),
1462 "neigh free for %06x %pI6\n",
1463 IPOIB_QPN(neigh->daddr),
1464 neigh->daddr + 4);
1465 kfree(neigh);
1466 if (atomic_dec_and_test(&priv->ntbl.entries)) {
1467 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1468 complete(&priv->ntbl.flushed);
1469 }
1470}
1471
1472static void ipoib_neigh_reclaim(struct rcu_head *rp)
1473{
1474 /* Called as a result of removal from hash table */
1475 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1476 /* note TX context may hold another ref */
1477 ipoib_neigh_put(neigh);
1478}
1479
1480void ipoib_neigh_free(struct ipoib_neigh *neigh)
1481{
1482 struct net_device *dev = neigh->dev;
1483 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1484 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1485 struct ipoib_neigh_hash *htbl;
1486 struct ipoib_neigh __rcu **np;
1487 struct ipoib_neigh *n;
1488 u32 hash_val;
1489
1490 htbl = rcu_dereference_protected(ntbl->htbl,
1491 lockdep_is_held(&priv->lock));
1492 if (!htbl)
1493 return;
1494
1495 hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1496 np = &htbl->buckets[hash_val];
1497 for (n = rcu_dereference_protected(*np,
1498 lockdep_is_held(&priv->lock));
1499 n != NULL;
1500 n = rcu_dereference_protected(*np,
1501 lockdep_is_held(&priv->lock))) {
1502 if (n == neigh) {
1503 /* found */
1504 rcu_assign_pointer(*np,
1505 rcu_dereference_protected(neigh->hnext,
1506 lockdep_is_held(&priv->lock)));
1507 /* remove from parent list */
1508 list_del_init(&neigh->list);
1509 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1510 return;
1511 } else {
1512 np = &n->hnext;
1513 }
1514 }
1515}
1516
1517static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1518{
1519 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1520 struct ipoib_neigh_hash *htbl;
1521 struct ipoib_neigh __rcu **buckets;
1522 u32 size;
1523
1524 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1525 ntbl->htbl = NULL;
1526 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1527 if (!htbl)
1528 return -ENOMEM;
1529 size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1530 buckets = kvcalloc(size, sizeof(*buckets), GFP_KERNEL);
1531 if (!buckets) {
1532 kfree(htbl);
1533 return -ENOMEM;
1534 }
1535 htbl->size = size;
1536 htbl->mask = (size - 1);
1537 htbl->buckets = buckets;
1538 RCU_INIT_POINTER(ntbl->htbl, htbl);
1539 htbl->ntbl = ntbl;
1540 atomic_set(&ntbl->entries, 0);
1541
1542 /* start garbage collection */
1543 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1544 arp_tbl.gc_interval);
1545
1546 return 0;
1547}
1548
1549static void neigh_hash_free_rcu(struct rcu_head *head)
1550{
1551 struct ipoib_neigh_hash *htbl = container_of(head,
1552 struct ipoib_neigh_hash,
1553 rcu);
1554 struct ipoib_neigh __rcu **buckets = htbl->buckets;
1555 struct ipoib_neigh_table *ntbl = htbl->ntbl;
1556
1557 kvfree(buckets);
1558 kfree(htbl);
1559 complete(&ntbl->deleted);
1560}
1561
1562void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1563{
1564 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1565 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1566 struct ipoib_neigh_hash *htbl;
1567 unsigned long flags;
1568 int i;
1569
1570 /* remove all neigh connected to a given path or mcast */
1571 spin_lock_irqsave(&priv->lock, flags);
1572
1573 htbl = rcu_dereference_protected(ntbl->htbl,
1574 lockdep_is_held(&priv->lock));
1575
1576 if (!htbl)
1577 goto out_unlock;
1578
1579 for (i = 0; i < htbl->size; i++) {
1580 struct ipoib_neigh *neigh;
1581 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1582
1583 while ((neigh = rcu_dereference_protected(*np,
1584 lockdep_is_held(&priv->lock))) != NULL) {
1585 /* delete neighs belong to this parent */
1586 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1587 rcu_assign_pointer(*np,
1588 rcu_dereference_protected(neigh->hnext,
1589 lockdep_is_held(&priv->lock)));
1590 /* remove from parent list */
1591 list_del_init(&neigh->list);
1592 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1593 } else {
1594 np = &neigh->hnext;
1595 }
1596
1597 }
1598 }
1599out_unlock:
1600 spin_unlock_irqrestore(&priv->lock, flags);
1601}
1602
1603static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1604{
1605 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1606 struct ipoib_neigh_hash *htbl;
1607 unsigned long flags;
1608 int i, wait_flushed = 0;
1609
1610 init_completion(&priv->ntbl.flushed);
1611 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1612
1613 spin_lock_irqsave(&priv->lock, flags);
1614
1615 htbl = rcu_dereference_protected(ntbl->htbl,
1616 lockdep_is_held(&priv->lock));
1617 if (!htbl)
1618 goto out_unlock;
1619
1620 wait_flushed = atomic_read(&priv->ntbl.entries);
1621 if (!wait_flushed)
1622 goto free_htbl;
1623
1624 for (i = 0; i < htbl->size; i++) {
1625 struct ipoib_neigh *neigh;
1626 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1627
1628 while ((neigh = rcu_dereference_protected(*np,
1629 lockdep_is_held(&priv->lock))) != NULL) {
1630 rcu_assign_pointer(*np,
1631 rcu_dereference_protected(neigh->hnext,
1632 lockdep_is_held(&priv->lock)));
1633 /* remove from path/mc list */
1634 list_del_init(&neigh->list);
1635 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1636 }
1637 }
1638
1639free_htbl:
1640 rcu_assign_pointer(ntbl->htbl, NULL);
1641 call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1642
1643out_unlock:
1644 spin_unlock_irqrestore(&priv->lock, flags);
1645 if (wait_flushed)
1646 wait_for_completion(&priv->ntbl.flushed);
1647}
1648
1649static void ipoib_neigh_hash_uninit(struct net_device *dev)
1650{
1651 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1652
1653 ipoib_dbg(priv, "%s\n", __func__);
1654 init_completion(&priv->ntbl.deleted);
1655
1656 cancel_delayed_work_sync(&priv->neigh_reap_task);
1657
1658 ipoib_flush_neighs(priv);
1659
1660 wait_for_completion(&priv->ntbl.deleted);
1661}
1662
1663static void ipoib_napi_add(struct net_device *dev)
1664{
1665 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1666
1667 netif_napi_add_weight(dev, &priv->recv_napi, ipoib_rx_poll,
1668 IPOIB_NUM_WC);
1669 netif_napi_add_weight(dev, &priv->send_napi, ipoib_tx_poll,
1670 MAX_SEND_CQE);
1671}
1672
1673static void ipoib_napi_del(struct net_device *dev)
1674{
1675 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1676
1677 netif_napi_del(&priv->recv_napi);
1678 netif_napi_del(&priv->send_napi);
1679}
1680
1681static void ipoib_dev_uninit_default(struct net_device *dev)
1682{
1683 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1684
1685 ipoib_transport_dev_cleanup(dev);
1686
1687 ipoib_napi_del(dev);
1688
1689 ipoib_cm_dev_cleanup(dev);
1690
1691 kfree(priv->rx_ring);
1692 vfree(priv->tx_ring);
1693
1694 priv->rx_ring = NULL;
1695 priv->tx_ring = NULL;
1696}
1697
1698static int ipoib_dev_init_default(struct net_device *dev)
1699{
1700 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1701 u8 addr_mod[3];
1702
1703 ipoib_napi_add(dev);
1704
1705 /* Allocate RX/TX "rings" to hold queued skbs */
1706 priv->rx_ring = kcalloc(ipoib_recvq_size,
1707 sizeof(*priv->rx_ring),
1708 GFP_KERNEL);
1709 if (!priv->rx_ring)
1710 goto out;
1711
1712 priv->tx_ring = vzalloc(array_size(ipoib_sendq_size,
1713 sizeof(*priv->tx_ring)));
1714 if (!priv->tx_ring) {
1715 pr_warn("%s: failed to allocate TX ring (%d entries)\n",
1716 priv->ca->name, ipoib_sendq_size);
1717 goto out_rx_ring_cleanup;
1718 }
1719
1720 /* priv->tx_head, tx_tail and global_tx_tail/head are already 0 */
1721
1722 if (ipoib_transport_dev_init(dev, priv->ca)) {
1723 pr_warn("%s: ipoib_transport_dev_init failed\n",
1724 priv->ca->name);
1725 goto out_tx_ring_cleanup;
1726 }
1727
1728 /* after qp created set dev address */
1729 addr_mod[0] = (priv->qp->qp_num >> 16) & 0xff;
1730 addr_mod[1] = (priv->qp->qp_num >> 8) & 0xff;
1731 addr_mod[2] = (priv->qp->qp_num) & 0xff;
1732 dev_addr_mod(priv->dev, 1, addr_mod, sizeof(addr_mod));
1733
1734 return 0;
1735
1736out_tx_ring_cleanup:
1737 vfree(priv->tx_ring);
1738
1739out_rx_ring_cleanup:
1740 kfree(priv->rx_ring);
1741
1742out:
1743 ipoib_napi_del(dev);
1744 return -ENOMEM;
1745}
1746
1747static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
1748 int cmd)
1749{
1750 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1751
1752 if (!priv->rn_ops->ndo_eth_ioctl)
1753 return -EOPNOTSUPP;
1754
1755 return priv->rn_ops->ndo_eth_ioctl(dev, ifr, cmd);
1756}
1757
1758static int ipoib_dev_init(struct net_device *dev)
1759{
1760 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1761 int ret = -ENOMEM;
1762
1763 priv->qp = NULL;
1764
1765 /*
1766 * the various IPoIB tasks assume they will never race against
1767 * themselves, so always use a single thread workqueue
1768 */
1769 priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM);
1770 if (!priv->wq) {
1771 pr_warn("%s: failed to allocate device WQ\n", dev->name);
1772 goto out;
1773 }
1774
1775 /* create pd, which used both for control and datapath*/
1776 priv->pd = ib_alloc_pd(priv->ca, 0);
1777 if (IS_ERR(priv->pd)) {
1778 pr_warn("%s: failed to allocate PD\n", priv->ca->name);
1779 goto clean_wq;
1780 }
1781
1782 ret = priv->rn_ops->ndo_init(dev);
1783 if (ret) {
1784 pr_warn("%s failed to init HW resource\n", dev->name);
1785 goto out_free_pd;
1786 }
1787
1788 ret = ipoib_neigh_hash_init(priv);
1789 if (ret) {
1790 pr_warn("%s failed to init neigh hash\n", dev->name);
1791 goto out_dev_uninit;
1792 }
1793
1794 if (dev->flags & IFF_UP) {
1795 if (ipoib_ib_dev_open(dev)) {
1796 pr_warn("%s failed to open device\n", dev->name);
1797 ret = -ENODEV;
1798 goto out_hash_uninit;
1799 }
1800 }
1801
1802 return 0;
1803
1804out_hash_uninit:
1805 ipoib_neigh_hash_uninit(dev);
1806
1807out_dev_uninit:
1808 ipoib_ib_dev_cleanup(dev);
1809
1810out_free_pd:
1811 if (priv->pd) {
1812 ib_dealloc_pd(priv->pd);
1813 priv->pd = NULL;
1814 }
1815
1816clean_wq:
1817 if (priv->wq) {
1818 destroy_workqueue(priv->wq);
1819 priv->wq = NULL;
1820 }
1821
1822out:
1823 return ret;
1824}
1825
1826/*
1827 * This must be called before doing an unregister_netdev on a parent device to
1828 * shutdown the IB event handler.
1829 */
1830static void ipoib_parent_unregister_pre(struct net_device *ndev)
1831{
1832 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1833
1834 /*
1835 * ipoib_set_mac checks netif_running before pushing work, clearing
1836 * running ensures the it will not add more work.
1837 */
1838 rtnl_lock();
1839 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP, NULL);
1840 rtnl_unlock();
1841
1842 /* ipoib_event() cannot be running once this returns */
1843 ib_unregister_event_handler(&priv->event_handler);
1844
1845 /*
1846 * Work on the queue grabs the rtnl lock, so this cannot be done while
1847 * also holding it.
1848 */
1849 flush_workqueue(ipoib_workqueue);
1850}
1851
1852static void ipoib_set_dev_features(struct ipoib_dev_priv *priv)
1853{
1854 priv->hca_caps = priv->ca->attrs.device_cap_flags;
1855 priv->kernel_caps = priv->ca->attrs.kernel_cap_flags;
1856
1857 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1858 priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1859
1860 if (priv->kernel_caps & IBK_UD_TSO)
1861 priv->dev->hw_features |= NETIF_F_TSO;
1862
1863 priv->dev->features |= priv->dev->hw_features;
1864 }
1865}
1866
1867static int ipoib_parent_init(struct net_device *ndev)
1868{
1869 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1870 struct ib_port_attr attr;
1871 int result;
1872
1873 result = ib_query_port(priv->ca, priv->port, &attr);
1874 if (result) {
1875 pr_warn("%s: ib_query_port %d failed\n", priv->ca->name,
1876 priv->port);
1877 return result;
1878 }
1879 priv->max_ib_mtu = rdma_mtu_from_attr(priv->ca, priv->port, &attr);
1880
1881 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
1882 if (result) {
1883 pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n",
1884 priv->ca->name, priv->port, result);
1885 return result;
1886 }
1887
1888 result = rdma_query_gid(priv->ca, priv->port, 0, &priv->local_gid);
1889 if (result) {
1890 pr_warn("%s: rdma_query_gid port %d failed (ret = %d)\n",
1891 priv->ca->name, priv->port, result);
1892 return result;
1893 }
1894 dev_addr_mod(priv->dev, 4, priv->local_gid.raw, sizeof(union ib_gid));
1895
1896 SET_NETDEV_DEV(priv->dev, priv->ca->dev.parent);
1897 priv->dev->dev_port = priv->port - 1;
1898 /* Let's set this one too for backwards compatibility. */
1899 priv->dev->dev_id = priv->port - 1;
1900
1901 return 0;
1902}
1903
1904static void ipoib_child_init(struct net_device *ndev)
1905{
1906 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1907 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1908
1909 priv->max_ib_mtu = ppriv->max_ib_mtu;
1910 set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
1911 if (memchr_inv(priv->dev->dev_addr, 0, INFINIBAND_ALEN))
1912 memcpy(&priv->local_gid, priv->dev->dev_addr + 4,
1913 sizeof(priv->local_gid));
1914 else {
1915 __dev_addr_set(priv->dev, ppriv->dev->dev_addr,
1916 INFINIBAND_ALEN);
1917 memcpy(&priv->local_gid, &ppriv->local_gid,
1918 sizeof(priv->local_gid));
1919 }
1920}
1921
1922static int ipoib_ndo_init(struct net_device *ndev)
1923{
1924 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1925 int rc;
1926 struct rdma_netdev *rn = netdev_priv(ndev);
1927
1928 if (priv->parent) {
1929 ipoib_child_init(ndev);
1930 } else {
1931 rc = ipoib_parent_init(ndev);
1932 if (rc)
1933 return rc;
1934 }
1935
1936 /* MTU will be reset when mcast join happens */
1937 ndev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1938 priv->mcast_mtu = priv->admin_mtu = ndev->mtu;
1939 rn->mtu = priv->mcast_mtu;
1940 ndev->max_mtu = IPOIB_CM_MTU;
1941
1942 ndev->neigh_priv_len = sizeof(struct ipoib_neigh);
1943
1944 /*
1945 * Set the full membership bit, so that we join the right
1946 * broadcast group, etc.
1947 */
1948 priv->pkey |= 0x8000;
1949
1950 ndev->broadcast[8] = priv->pkey >> 8;
1951 ndev->broadcast[9] = priv->pkey & 0xff;
1952 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1953
1954 ipoib_set_dev_features(priv);
1955
1956 rc = ipoib_dev_init(ndev);
1957 if (rc) {
1958 pr_warn("%s: failed to initialize device: %s port %d (ret = %d)\n",
1959 priv->ca->name, priv->dev->name, priv->port, rc);
1960 return rc;
1961 }
1962
1963 if (priv->parent) {
1964 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1965
1966 dev_hold(priv->parent);
1967
1968 down_write(&ppriv->vlan_rwsem);
1969 list_add_tail(&priv->list, &ppriv->child_intfs);
1970 up_write(&ppriv->vlan_rwsem);
1971 }
1972
1973 return 0;
1974}
1975
1976static void ipoib_ndo_uninit(struct net_device *dev)
1977{
1978 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1979
1980 ASSERT_RTNL();
1981
1982 /*
1983 * ipoib_remove_one guarantees the children are removed before the
1984 * parent, and that is the only place where a parent can be removed.
1985 */
1986 WARN_ON(!list_empty(&priv->child_intfs));
1987
1988 if (priv->parent) {
1989 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1990
1991 down_write(&ppriv->vlan_rwsem);
1992 list_del(&priv->list);
1993 up_write(&ppriv->vlan_rwsem);
1994 }
1995
1996 ipoib_neigh_hash_uninit(dev);
1997
1998 ipoib_ib_dev_cleanup(dev);
1999
2000 /* no more works over the priv->wq */
2001 if (priv->wq) {
2002 /* See ipoib_mcast_carrier_on_task() */
2003 WARN_ON(test_bit(IPOIB_FLAG_OPER_UP, &priv->flags));
2004 destroy_workqueue(priv->wq);
2005 priv->wq = NULL;
2006 }
2007
2008 if (priv->parent)
2009 dev_put(priv->parent);
2010}
2011
2012static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
2013{
2014 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2015
2016 return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
2017}
2018
2019static int ipoib_get_vf_config(struct net_device *dev, int vf,
2020 struct ifla_vf_info *ivf)
2021{
2022 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2023 int err;
2024
2025 err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
2026 if (err)
2027 return err;
2028
2029 ivf->vf = vf;
2030 memcpy(ivf->mac, dev->dev_addr, dev->addr_len);
2031
2032 return 0;
2033}
2034
2035static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
2036{
2037 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2038
2039 if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
2040 return -EINVAL;
2041
2042 return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
2043}
2044
2045static int ipoib_get_vf_guid(struct net_device *dev, int vf,
2046 struct ifla_vf_guid *node_guid,
2047 struct ifla_vf_guid *port_guid)
2048{
2049 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2050
2051 return ib_get_vf_guid(priv->ca, vf, priv->port, node_guid, port_guid);
2052}
2053
2054static int ipoib_get_vf_stats(struct net_device *dev, int vf,
2055 struct ifla_vf_stats *vf_stats)
2056{
2057 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2058
2059 return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
2060}
2061
2062static const struct header_ops ipoib_header_ops = {
2063 .create = ipoib_hard_header,
2064};
2065
2066static const struct net_device_ops ipoib_netdev_ops_pf = {
2067 .ndo_init = ipoib_ndo_init,
2068 .ndo_uninit = ipoib_ndo_uninit,
2069 .ndo_open = ipoib_open,
2070 .ndo_stop = ipoib_stop,
2071 .ndo_change_mtu = ipoib_change_mtu,
2072 .ndo_fix_features = ipoib_fix_features,
2073 .ndo_start_xmit = ipoib_start_xmit,
2074 .ndo_tx_timeout = ipoib_timeout,
2075 .ndo_set_rx_mode = ipoib_set_mcast_list,
2076 .ndo_get_iflink = ipoib_get_iflink,
2077 .ndo_set_vf_link_state = ipoib_set_vf_link_state,
2078 .ndo_get_vf_config = ipoib_get_vf_config,
2079 .ndo_get_vf_stats = ipoib_get_vf_stats,
2080 .ndo_get_vf_guid = ipoib_get_vf_guid,
2081 .ndo_set_vf_guid = ipoib_set_vf_guid,
2082 .ndo_set_mac_address = ipoib_set_mac,
2083 .ndo_get_stats64 = ipoib_get_stats,
2084 .ndo_eth_ioctl = ipoib_ioctl,
2085};
2086
2087static const struct net_device_ops ipoib_netdev_ops_vf = {
2088 .ndo_init = ipoib_ndo_init,
2089 .ndo_uninit = ipoib_ndo_uninit,
2090 .ndo_open = ipoib_open,
2091 .ndo_stop = ipoib_stop,
2092 .ndo_change_mtu = ipoib_change_mtu,
2093 .ndo_fix_features = ipoib_fix_features,
2094 .ndo_start_xmit = ipoib_start_xmit,
2095 .ndo_tx_timeout = ipoib_timeout,
2096 .ndo_set_rx_mode = ipoib_set_mcast_list,
2097 .ndo_get_iflink = ipoib_get_iflink,
2098 .ndo_get_stats64 = ipoib_get_stats,
2099 .ndo_eth_ioctl = ipoib_ioctl,
2100};
2101
2102static const struct net_device_ops ipoib_netdev_default_pf = {
2103 .ndo_init = ipoib_dev_init_default,
2104 .ndo_uninit = ipoib_dev_uninit_default,
2105 .ndo_open = ipoib_ib_dev_open_default,
2106 .ndo_stop = ipoib_ib_dev_stop_default,
2107};
2108
2109void ipoib_setup_common(struct net_device *dev)
2110{
2111 dev->header_ops = &ipoib_header_ops;
2112 dev->netdev_ops = &ipoib_netdev_default_pf;
2113
2114 ipoib_set_ethtool_ops(dev);
2115
2116 dev->watchdog_timeo = HZ;
2117
2118 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
2119
2120 dev->hard_header_len = IPOIB_HARD_LEN;
2121 dev->addr_len = INFINIBAND_ALEN;
2122 dev->type = ARPHRD_INFINIBAND;
2123 dev->tx_queue_len = ipoib_sendq_size * 2;
2124 dev->features = (NETIF_F_VLAN_CHALLENGED |
2125 NETIF_F_HIGHDMA);
2126 netif_keep_dst(dev);
2127
2128 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
2129
2130 /*
2131 * unregister_netdev always frees the netdev, we use this mode
2132 * consistently to unify all the various unregister paths, including
2133 * those connected to rtnl_link_ops which require it.
2134 */
2135 dev->needs_free_netdev = true;
2136}
2137
2138static void ipoib_build_priv(struct net_device *dev)
2139{
2140 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2141
2142 priv->dev = dev;
2143 spin_lock_init(&priv->lock);
2144 init_rwsem(&priv->vlan_rwsem);
2145 mutex_init(&priv->mcast_mutex);
2146
2147 INIT_LIST_HEAD(&priv->path_list);
2148 INIT_LIST_HEAD(&priv->child_intfs);
2149 INIT_LIST_HEAD(&priv->dead_ahs);
2150 INIT_LIST_HEAD(&priv->multicast_list);
2151
2152 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
2153 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
2154 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
2155 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
2156 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
2157 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
2158 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
2159 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
2160}
2161
2162static struct net_device *ipoib_alloc_netdev(struct ib_device *hca, u32 port,
2163 const char *name)
2164{
2165 struct net_device *dev;
2166
2167 dev = rdma_alloc_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
2168 NET_NAME_UNKNOWN, ipoib_setup_common);
2169 if (!IS_ERR(dev) || PTR_ERR(dev) != -EOPNOTSUPP)
2170 return dev;
2171
2172 dev = alloc_netdev(sizeof(struct rdma_netdev), name, NET_NAME_UNKNOWN,
2173 ipoib_setup_common);
2174 if (!dev)
2175 return ERR_PTR(-ENOMEM);
2176 return dev;
2177}
2178
2179int ipoib_intf_init(struct ib_device *hca, u32 port, const char *name,
2180 struct net_device *dev)
2181{
2182 struct rdma_netdev *rn = netdev_priv(dev);
2183 struct ipoib_dev_priv *priv;
2184 int rc;
2185
2186 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2187 if (!priv)
2188 return -ENOMEM;
2189
2190 priv->ca = hca;
2191 priv->port = port;
2192
2193 rc = rdma_init_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
2194 NET_NAME_UNKNOWN, ipoib_setup_common, dev);
2195 if (rc) {
2196 if (rc != -EOPNOTSUPP)
2197 goto out;
2198
2199 rn->send = ipoib_send;
2200 rn->attach_mcast = ipoib_mcast_attach;
2201 rn->detach_mcast = ipoib_mcast_detach;
2202 rn->hca = hca;
2203
2204 rc = netif_set_real_num_tx_queues(dev, 1);
2205 if (rc)
2206 goto out;
2207
2208 rc = netif_set_real_num_rx_queues(dev, 1);
2209 if (rc)
2210 goto out;
2211 }
2212
2213 priv->rn_ops = dev->netdev_ops;
2214
2215 if (hca->attrs.kernel_cap_flags & IBK_VIRTUAL_FUNCTION)
2216 dev->netdev_ops = &ipoib_netdev_ops_vf;
2217 else
2218 dev->netdev_ops = &ipoib_netdev_ops_pf;
2219
2220 rn->clnt_priv = priv;
2221 /*
2222 * Only the child register_netdev flows can handle priv_destructor
2223 * being set, so we force it to NULL here and handle manually until it
2224 * is safe to turn on.
2225 */
2226 priv->next_priv_destructor = dev->priv_destructor;
2227 dev->priv_destructor = NULL;
2228
2229 ipoib_build_priv(dev);
2230
2231 return 0;
2232
2233out:
2234 kfree(priv);
2235 return rc;
2236}
2237
2238struct net_device *ipoib_intf_alloc(struct ib_device *hca, u32 port,
2239 const char *name)
2240{
2241 struct net_device *dev;
2242 int rc;
2243
2244 dev = ipoib_alloc_netdev(hca, port, name);
2245 if (IS_ERR(dev))
2246 return dev;
2247
2248 rc = ipoib_intf_init(hca, port, name, dev);
2249 if (rc) {
2250 free_netdev(dev);
2251 return ERR_PTR(rc);
2252 }
2253
2254 /*
2255 * Upon success the caller must ensure ipoib_intf_free is called or
2256 * register_netdevice succeed'd and priv_destructor is set to
2257 * ipoib_intf_free.
2258 */
2259 return dev;
2260}
2261
2262void ipoib_intf_free(struct net_device *dev)
2263{
2264 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2265 struct rdma_netdev *rn = netdev_priv(dev);
2266
2267 dev->priv_destructor = priv->next_priv_destructor;
2268 if (dev->priv_destructor)
2269 dev->priv_destructor(dev);
2270
2271 /*
2272 * There are some error flows around register_netdev failing that may
2273 * attempt to call priv_destructor twice, prevent that from happening.
2274 */
2275 dev->priv_destructor = NULL;
2276
2277 /* unregister/destroy is very complicated. Make bugs more obvious. */
2278 rn->clnt_priv = NULL;
2279
2280 kfree(priv);
2281}
2282
2283static ssize_t pkey_show(struct device *dev, struct device_attribute *attr,
2284 char *buf)
2285{
2286 struct net_device *ndev = to_net_dev(dev);
2287 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2288
2289 return sysfs_emit(buf, "0x%04x\n", priv->pkey);
2290}
2291static DEVICE_ATTR_RO(pkey);
2292
2293static ssize_t umcast_show(struct device *dev, struct device_attribute *attr,
2294 char *buf)
2295{
2296 struct net_device *ndev = to_net_dev(dev);
2297 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2298
2299 return sysfs_emit(buf, "%d\n",
2300 test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
2301}
2302
2303void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
2304{
2305 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2306
2307 if (umcast_val > 0) {
2308 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2309 ipoib_warn(priv, "ignoring multicast groups joined directly "
2310 "by userspace\n");
2311 } else
2312 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2313}
2314
2315static ssize_t umcast_store(struct device *dev, struct device_attribute *attr,
2316 const char *buf, size_t count)
2317{
2318 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
2319
2320 ipoib_set_umcast(to_net_dev(dev), umcast_val);
2321
2322 return count;
2323}
2324static DEVICE_ATTR_RW(umcast);
2325
2326int ipoib_add_umcast_attr(struct net_device *dev)
2327{
2328 return device_create_file(&dev->dev, &dev_attr_umcast);
2329}
2330
2331static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
2332{
2333 struct ipoib_dev_priv *child_priv;
2334 struct net_device *netdev = priv->dev;
2335
2336 netif_addr_lock_bh(netdev);
2337
2338 memcpy(&priv->local_gid.global.interface_id,
2339 &gid->global.interface_id,
2340 sizeof(gid->global.interface_id));
2341 dev_addr_mod(netdev, 4, (u8 *)&priv->local_gid, sizeof(priv->local_gid));
2342 clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2343
2344 netif_addr_unlock_bh(netdev);
2345
2346 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
2347 down_read(&priv->vlan_rwsem);
2348 list_for_each_entry(child_priv, &priv->child_intfs, list)
2349 set_base_guid(child_priv, gid);
2350 up_read(&priv->vlan_rwsem);
2351 }
2352}
2353
2354static int ipoib_check_lladdr(struct net_device *dev,
2355 struct sockaddr_storage *ss)
2356{
2357 union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
2358 int ret = 0;
2359
2360 netif_addr_lock_bh(dev);
2361
2362 /* Make sure the QPN, reserved and subnet prefix match the current
2363 * lladdr, it also makes sure the lladdr is unicast.
2364 */
2365 if (memcmp(dev->dev_addr, ss->__data,
2366 4 + sizeof(gid->global.subnet_prefix)) ||
2367 gid->global.interface_id == 0)
2368 ret = -EINVAL;
2369
2370 netif_addr_unlock_bh(dev);
2371
2372 return ret;
2373}
2374
2375static int ipoib_set_mac(struct net_device *dev, void *addr)
2376{
2377 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2378 struct sockaddr_storage *ss = addr;
2379 int ret;
2380
2381 if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
2382 return -EBUSY;
2383
2384 ret = ipoib_check_lladdr(dev, ss);
2385 if (ret)
2386 return ret;
2387
2388 set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
2389
2390 queue_work(ipoib_workqueue, &priv->flush_light);
2391
2392 return 0;
2393}
2394
2395static ssize_t create_child_store(struct device *dev,
2396 struct device_attribute *attr,
2397 const char *buf, size_t count)
2398{
2399 int pkey;
2400 int ret;
2401
2402 if (sscanf(buf, "%i", &pkey) != 1)
2403 return -EINVAL;
2404
2405 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
2406 return -EINVAL;
2407
2408 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
2409
2410 return ret ? ret : count;
2411}
2412static DEVICE_ATTR_WO(create_child);
2413
2414static ssize_t delete_child_store(struct device *dev,
2415 struct device_attribute *attr,
2416 const char *buf, size_t count)
2417{
2418 int pkey;
2419 int ret;
2420
2421 if (sscanf(buf, "%i", &pkey) != 1)
2422 return -EINVAL;
2423
2424 if (pkey < 0 || pkey > 0xffff)
2425 return -EINVAL;
2426
2427 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
2428
2429 return ret ? ret : count;
2430
2431}
2432static DEVICE_ATTR_WO(delete_child);
2433
2434int ipoib_add_pkey_attr(struct net_device *dev)
2435{
2436 return device_create_file(&dev->dev, &dev_attr_pkey);
2437}
2438
2439/*
2440 * We erroneously exposed the iface's port number in the dev_id
2441 * sysfs field long after dev_port was introduced for that purpose[1],
2442 * and we need to stop everyone from relying on that.
2443 * Let's overload the shower routine for the dev_id file here
2444 * to gently bring the issue up.
2445 *
2446 * [1] https://www.spinics.net/lists/netdev/msg272123.html
2447 */
2448static ssize_t dev_id_show(struct device *dev,
2449 struct device_attribute *attr, char *buf)
2450{
2451 struct net_device *ndev = to_net_dev(dev);
2452
2453 /*
2454 * ndev->dev_port will be equal to 0 in old kernel prior to commit
2455 * 9b8b2a323008 ("IB/ipoib: Use dev_port to expose network interface
2456 * port numbers") Zero was chosen as special case for user space
2457 * applications to fallback and query dev_id to check if it has
2458 * different value or not.
2459 *
2460 * Don't print warning in such scenario.
2461 *
2462 * https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L358
2463 */
2464 if (ndev->dev_port && ndev->dev_id == ndev->dev_port)
2465 netdev_info_once(ndev,
2466 "\"%s\" wants to know my dev_id. Should it look at dev_port instead? See Documentation/ABI/testing/sysfs-class-net for more info.\n",
2467 current->comm);
2468
2469 return sysfs_emit(buf, "%#x\n", ndev->dev_id);
2470}
2471static DEVICE_ATTR_RO(dev_id);
2472
2473static int ipoib_intercept_dev_id_attr(struct net_device *dev)
2474{
2475 device_remove_file(&dev->dev, &dev_attr_dev_id);
2476 return device_create_file(&dev->dev, &dev_attr_dev_id);
2477}
2478
2479static struct net_device *ipoib_add_port(const char *format,
2480 struct ib_device *hca, u32 port)
2481{
2482 struct rtnl_link_ops *ops = ipoib_get_link_ops();
2483 struct rdma_netdev_alloc_params params;
2484 struct ipoib_dev_priv *priv;
2485 struct net_device *ndev;
2486 int result;
2487
2488 ndev = ipoib_intf_alloc(hca, port, format);
2489 if (IS_ERR(ndev)) {
2490 pr_warn("%s, %d: ipoib_intf_alloc failed %ld\n", hca->name, port,
2491 PTR_ERR(ndev));
2492 return ndev;
2493 }
2494 priv = ipoib_priv(ndev);
2495
2496 INIT_IB_EVENT_HANDLER(&priv->event_handler,
2497 priv->ca, ipoib_event);
2498 ib_register_event_handler(&priv->event_handler);
2499
2500 /* call event handler to ensure pkey in sync */
2501 queue_work(ipoib_workqueue, &priv->flush_heavy);
2502
2503 ndev->rtnl_link_ops = ipoib_get_link_ops();
2504
2505 result = register_netdev(ndev);
2506 if (result) {
2507 pr_warn("%s: couldn't register ipoib port %d; error %d\n",
2508 hca->name, port, result);
2509
2510 ipoib_parent_unregister_pre(ndev);
2511 ipoib_intf_free(ndev);
2512 free_netdev(ndev);
2513
2514 return ERR_PTR(result);
2515 }
2516
2517 if (hca->ops.rdma_netdev_get_params) {
2518 int rc = hca->ops.rdma_netdev_get_params(hca, port,
2519 RDMA_NETDEV_IPOIB,
2520 ¶ms);
2521
2522 if (!rc && ops->priv_size < params.sizeof_priv)
2523 ops->priv_size = params.sizeof_priv;
2524 }
2525 /*
2526 * We cannot set priv_destructor before register_netdev because we
2527 * need priv to be always valid during the error flow to execute
2528 * ipoib_parent_unregister_pre(). Instead handle it manually and only
2529 * enter priv_destructor mode once we are completely registered.
2530 */
2531 ndev->priv_destructor = ipoib_intf_free;
2532
2533 if (ipoib_intercept_dev_id_attr(ndev))
2534 goto sysfs_failed;
2535 if (ipoib_cm_add_mode_attr(ndev))
2536 goto sysfs_failed;
2537 if (ipoib_add_pkey_attr(ndev))
2538 goto sysfs_failed;
2539 if (ipoib_add_umcast_attr(ndev))
2540 goto sysfs_failed;
2541 if (device_create_file(&ndev->dev, &dev_attr_create_child))
2542 goto sysfs_failed;
2543 if (device_create_file(&ndev->dev, &dev_attr_delete_child))
2544 goto sysfs_failed;
2545
2546 return ndev;
2547
2548sysfs_failed:
2549 ipoib_parent_unregister_pre(ndev);
2550 unregister_netdev(ndev);
2551 return ERR_PTR(-ENOMEM);
2552}
2553
2554static int ipoib_add_one(struct ib_device *device)
2555{
2556 struct list_head *dev_list;
2557 struct net_device *dev;
2558 struct ipoib_dev_priv *priv;
2559 unsigned int p;
2560 int count = 0;
2561
2562 dev_list = kmalloc(sizeof(*dev_list), GFP_KERNEL);
2563 if (!dev_list)
2564 return -ENOMEM;
2565
2566 INIT_LIST_HEAD(dev_list);
2567
2568 rdma_for_each_port (device, p) {
2569 if (!rdma_protocol_ib(device, p))
2570 continue;
2571 dev = ipoib_add_port("ib%d", device, p);
2572 if (!IS_ERR(dev)) {
2573 priv = ipoib_priv(dev);
2574 list_add_tail(&priv->list, dev_list);
2575 count++;
2576 }
2577 }
2578
2579 if (!count) {
2580 kfree(dev_list);
2581 return -EOPNOTSUPP;
2582 }
2583
2584 ib_set_client_data(device, &ipoib_client, dev_list);
2585 return 0;
2586}
2587
2588static void ipoib_remove_one(struct ib_device *device, void *client_data)
2589{
2590 struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv;
2591 struct list_head *dev_list = client_data;
2592
2593 list_for_each_entry_safe(priv, tmp, dev_list, list) {
2594 LIST_HEAD(head);
2595 ipoib_parent_unregister_pre(priv->dev);
2596
2597 rtnl_lock();
2598
2599 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs,
2600 list)
2601 unregister_netdevice_queue(cpriv->dev, &head);
2602 unregister_netdevice_queue(priv->dev, &head);
2603 unregister_netdevice_many(&head);
2604
2605 rtnl_unlock();
2606 }
2607
2608 kfree(dev_list);
2609}
2610
2611#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2612static struct notifier_block ipoib_netdev_notifier = {
2613 .notifier_call = ipoib_netdev_event,
2614};
2615#endif
2616
2617static int __init ipoib_init_module(void)
2618{
2619 int ret;
2620
2621 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2622 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2623 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2624
2625 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2626 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2627 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2628#ifdef CONFIG_INFINIBAND_IPOIB_CM
2629 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2630 ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0);
2631#endif
2632
2633 /*
2634 * When copying small received packets, we only copy from the
2635 * linear data part of the SKB, so we rely on this condition.
2636 */
2637 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2638
2639 ipoib_register_debugfs();
2640
2641 /*
2642 * We create a global workqueue here that is used for all flush
2643 * operations. However, if you attempt to flush a workqueue
2644 * from a task on that same workqueue, it deadlocks the system.
2645 * We want to be able to flush the tasks associated with a
2646 * specific net device, so we also create a workqueue for each
2647 * netdevice. We queue up the tasks for that device only on
2648 * its private workqueue, and we only queue up flush events
2649 * on our global flush workqueue. This avoids the deadlocks.
2650 */
2651 ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 0);
2652 if (!ipoib_workqueue) {
2653 ret = -ENOMEM;
2654 goto err_fs;
2655 }
2656
2657 ib_sa_register_client(&ipoib_sa_client);
2658
2659 ret = ib_register_client(&ipoib_client);
2660 if (ret)
2661 goto err_sa;
2662
2663 ret = ipoib_netlink_init();
2664 if (ret)
2665 goto err_client;
2666
2667#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2668 register_netdevice_notifier(&ipoib_netdev_notifier);
2669#endif
2670 return 0;
2671
2672err_client:
2673 ib_unregister_client(&ipoib_client);
2674
2675err_sa:
2676 ib_sa_unregister_client(&ipoib_sa_client);
2677 destroy_workqueue(ipoib_workqueue);
2678
2679err_fs:
2680 ipoib_unregister_debugfs();
2681
2682 return ret;
2683}
2684
2685static void __exit ipoib_cleanup_module(void)
2686{
2687#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2688 unregister_netdevice_notifier(&ipoib_netdev_notifier);
2689#endif
2690 ipoib_netlink_fini();
2691 ib_unregister_client(&ipoib_client);
2692 ib_sa_unregister_client(&ipoib_sa_client);
2693 ipoib_unregister_debugfs();
2694 destroy_workqueue(ipoib_workqueue);
2695}
2696
2697module_init(ipoib_init_module);
2698module_exit(ipoib_cleanup_module);