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IB/ipoib: Scatter-Gather support in connected mode
[deliverable/linux.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35 #include "ipoib.h"
36
37 #include <linux/module.h>
38
39 #include <linux/init.h>
40 #include <linux/slab.h>
41 #include <linux/kernel.h>
42 #include <linux/vmalloc.h>
43
44 #include <linux/if_arp.h> /* For ARPHRD_xxx */
45
46 #include <linux/ip.h>
47 #include <linux/in.h>
48
49 #include <linux/jhash.h>
50 #include <net/arp.h>
51
52 #define DRV_VERSION "1.0.0"
53
54 const char ipoib_driver_version[] = DRV_VERSION;
55
56 MODULE_AUTHOR("Roland Dreier");
57 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
58 MODULE_LICENSE("Dual BSD/GPL");
59 MODULE_VERSION(DRV_VERSION);
60
61 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
62 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
63
64 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
65 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
66 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
67 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
68
69 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
70 int ipoib_debug_level;
71
72 module_param_named(debug_level, ipoib_debug_level, int, 0644);
73 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
74 #endif
75
76 struct ipoib_path_iter {
77 struct net_device *dev;
78 struct ipoib_path path;
79 };
80
81 static const u8 ipv4_bcast_addr[] = {
82 0x00, 0xff, 0xff, 0xff,
83 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
84 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
85 };
86
87 struct workqueue_struct *ipoib_workqueue;
88
89 struct ib_sa_client ipoib_sa_client;
90
91 static void ipoib_add_one(struct ib_device *device);
92 static void ipoib_remove_one(struct ib_device *device);
93 static void ipoib_neigh_reclaim(struct rcu_head *rp);
94
95 static struct ib_client ipoib_client = {
96 .name = "ipoib",
97 .add = ipoib_add_one,
98 .remove = ipoib_remove_one
99 };
100
101 int ipoib_open(struct net_device *dev)
102 {
103 struct ipoib_dev_priv *priv = netdev_priv(dev);
104
105 ipoib_dbg(priv, "bringing up interface\n");
106
107 netif_carrier_off(dev);
108
109 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
110
111 if (ipoib_ib_dev_open(dev)) {
112 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
113 return 0;
114 goto err_disable;
115 }
116
117 if (ipoib_ib_dev_up(dev))
118 goto err_stop;
119
120 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
121 struct ipoib_dev_priv *cpriv;
122
123 /* Bring up any child interfaces too */
124 down_read(&priv->vlan_rwsem);
125 list_for_each_entry(cpriv, &priv->child_intfs, list) {
126 int flags;
127
128 flags = cpriv->dev->flags;
129 if (flags & IFF_UP)
130 continue;
131
132 dev_change_flags(cpriv->dev, flags | IFF_UP);
133 }
134 up_read(&priv->vlan_rwsem);
135 }
136
137 netif_start_queue(dev);
138
139 return 0;
140
141 err_stop:
142 ipoib_ib_dev_stop(dev);
143
144 err_disable:
145 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
146
147 return -EINVAL;
148 }
149
150 static int ipoib_stop(struct net_device *dev)
151 {
152 struct ipoib_dev_priv *priv = netdev_priv(dev);
153
154 ipoib_dbg(priv, "stopping interface\n");
155
156 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
157
158 netif_stop_queue(dev);
159
160 ipoib_ib_dev_down(dev);
161 ipoib_ib_dev_stop(dev);
162
163 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
164 struct ipoib_dev_priv *cpriv;
165
166 /* Bring down any child interfaces too */
167 down_read(&priv->vlan_rwsem);
168 list_for_each_entry(cpriv, &priv->child_intfs, list) {
169 int flags;
170
171 flags = cpriv->dev->flags;
172 if (!(flags & IFF_UP))
173 continue;
174
175 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
176 }
177 up_read(&priv->vlan_rwsem);
178 }
179
180 return 0;
181 }
182
183 static void ipoib_uninit(struct net_device *dev)
184 {
185 ipoib_dev_cleanup(dev);
186 }
187
188 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
189 {
190 struct ipoib_dev_priv *priv = netdev_priv(dev);
191
192 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
193 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
194
195 return features;
196 }
197
198 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
199 {
200 struct ipoib_dev_priv *priv = netdev_priv(dev);
201
202 /* dev->mtu > 2K ==> connected mode */
203 if (ipoib_cm_admin_enabled(dev)) {
204 if (new_mtu > ipoib_cm_max_mtu(dev))
205 return -EINVAL;
206
207 if (new_mtu > priv->mcast_mtu)
208 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
209 priv->mcast_mtu);
210
211 dev->mtu = new_mtu;
212 return 0;
213 }
214
215 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
216 return -EINVAL;
217
218 priv->admin_mtu = new_mtu;
219
220 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
221
222 return 0;
223 }
224
225 int ipoib_set_mode(struct net_device *dev, const char *buf)
226 {
227 struct ipoib_dev_priv *priv = netdev_priv(dev);
228
229 /* flush paths if we switch modes so that connections are restarted */
230 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
231 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
232 ipoib_warn(priv, "enabling connected mode "
233 "will cause multicast packet drops\n");
234 netdev_update_features(dev);
235 rtnl_unlock();
236 priv->tx_wr.send_flags &= ~IB_SEND_IP_CSUM;
237
238 ipoib_flush_paths(dev);
239 rtnl_lock();
240 return 0;
241 }
242
243 if (!strcmp(buf, "datagram\n")) {
244 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
245 netdev_update_features(dev);
246 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
247 rtnl_unlock();
248 ipoib_flush_paths(dev);
249 rtnl_lock();
250 return 0;
251 }
252
253 return -EINVAL;
254 }
255
256 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
257 {
258 struct ipoib_dev_priv *priv = netdev_priv(dev);
259 struct rb_node *n = priv->path_tree.rb_node;
260 struct ipoib_path *path;
261 int ret;
262
263 while (n) {
264 path = rb_entry(n, struct ipoib_path, rb_node);
265
266 ret = memcmp(gid, path->pathrec.dgid.raw,
267 sizeof (union ib_gid));
268
269 if (ret < 0)
270 n = n->rb_left;
271 else if (ret > 0)
272 n = n->rb_right;
273 else
274 return path;
275 }
276
277 return NULL;
278 }
279
280 static int __path_add(struct net_device *dev, struct ipoib_path *path)
281 {
282 struct ipoib_dev_priv *priv = netdev_priv(dev);
283 struct rb_node **n = &priv->path_tree.rb_node;
284 struct rb_node *pn = NULL;
285 struct ipoib_path *tpath;
286 int ret;
287
288 while (*n) {
289 pn = *n;
290 tpath = rb_entry(pn, struct ipoib_path, rb_node);
291
292 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
293 sizeof (union ib_gid));
294 if (ret < 0)
295 n = &pn->rb_left;
296 else if (ret > 0)
297 n = &pn->rb_right;
298 else
299 return -EEXIST;
300 }
301
302 rb_link_node(&path->rb_node, pn, n);
303 rb_insert_color(&path->rb_node, &priv->path_tree);
304
305 list_add_tail(&path->list, &priv->path_list);
306
307 return 0;
308 }
309
310 static void path_free(struct net_device *dev, struct ipoib_path *path)
311 {
312 struct sk_buff *skb;
313
314 while ((skb = __skb_dequeue(&path->queue)))
315 dev_kfree_skb_irq(skb);
316
317 ipoib_dbg(netdev_priv(dev), "path_free\n");
318
319 /* remove all neigh connected to this path */
320 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
321
322 if (path->ah)
323 ipoib_put_ah(path->ah);
324
325 kfree(path);
326 }
327
328 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
329
330 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
331 {
332 struct ipoib_path_iter *iter;
333
334 iter = kmalloc(sizeof *iter, GFP_KERNEL);
335 if (!iter)
336 return NULL;
337
338 iter->dev = dev;
339 memset(iter->path.pathrec.dgid.raw, 0, 16);
340
341 if (ipoib_path_iter_next(iter)) {
342 kfree(iter);
343 return NULL;
344 }
345
346 return iter;
347 }
348
349 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
350 {
351 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
352 struct rb_node *n;
353 struct ipoib_path *path;
354 int ret = 1;
355
356 spin_lock_irq(&priv->lock);
357
358 n = rb_first(&priv->path_tree);
359
360 while (n) {
361 path = rb_entry(n, struct ipoib_path, rb_node);
362
363 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
364 sizeof (union ib_gid)) < 0) {
365 iter->path = *path;
366 ret = 0;
367 break;
368 }
369
370 n = rb_next(n);
371 }
372
373 spin_unlock_irq(&priv->lock);
374
375 return ret;
376 }
377
378 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
379 struct ipoib_path *path)
380 {
381 *path = iter->path;
382 }
383
384 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
385
386 void ipoib_mark_paths_invalid(struct net_device *dev)
387 {
388 struct ipoib_dev_priv *priv = netdev_priv(dev);
389 struct ipoib_path *path, *tp;
390
391 spin_lock_irq(&priv->lock);
392
393 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
394 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
395 be16_to_cpu(path->pathrec.dlid),
396 path->pathrec.dgid.raw);
397 path->valid = 0;
398 }
399
400 spin_unlock_irq(&priv->lock);
401 }
402
403 void ipoib_flush_paths(struct net_device *dev)
404 {
405 struct ipoib_dev_priv *priv = netdev_priv(dev);
406 struct ipoib_path *path, *tp;
407 LIST_HEAD(remove_list);
408 unsigned long flags;
409
410 netif_tx_lock_bh(dev);
411 spin_lock_irqsave(&priv->lock, flags);
412
413 list_splice_init(&priv->path_list, &remove_list);
414
415 list_for_each_entry(path, &remove_list, list)
416 rb_erase(&path->rb_node, &priv->path_tree);
417
418 list_for_each_entry_safe(path, tp, &remove_list, list) {
419 if (path->query)
420 ib_sa_cancel_query(path->query_id, path->query);
421 spin_unlock_irqrestore(&priv->lock, flags);
422 netif_tx_unlock_bh(dev);
423 wait_for_completion(&path->done);
424 path_free(dev, path);
425 netif_tx_lock_bh(dev);
426 spin_lock_irqsave(&priv->lock, flags);
427 }
428
429 spin_unlock_irqrestore(&priv->lock, flags);
430 netif_tx_unlock_bh(dev);
431 }
432
433 static void path_rec_completion(int status,
434 struct ib_sa_path_rec *pathrec,
435 void *path_ptr)
436 {
437 struct ipoib_path *path = path_ptr;
438 struct net_device *dev = path->dev;
439 struct ipoib_dev_priv *priv = netdev_priv(dev);
440 struct ipoib_ah *ah = NULL;
441 struct ipoib_ah *old_ah = NULL;
442 struct ipoib_neigh *neigh, *tn;
443 struct sk_buff_head skqueue;
444 struct sk_buff *skb;
445 unsigned long flags;
446
447 if (!status)
448 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
449 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
450 else
451 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
452 status, path->pathrec.dgid.raw);
453
454 skb_queue_head_init(&skqueue);
455
456 if (!status) {
457 struct ib_ah_attr av;
458
459 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
460 ah = ipoib_create_ah(dev, priv->pd, &av);
461 }
462
463 spin_lock_irqsave(&priv->lock, flags);
464
465 if (!IS_ERR_OR_NULL(ah)) {
466 path->pathrec = *pathrec;
467
468 old_ah = path->ah;
469 path->ah = ah;
470
471 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
472 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
473
474 while ((skb = __skb_dequeue(&path->queue)))
475 __skb_queue_tail(&skqueue, skb);
476
477 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
478 if (neigh->ah) {
479 WARN_ON(neigh->ah != old_ah);
480 /*
481 * Dropping the ah reference inside
482 * priv->lock is safe here, because we
483 * will hold one more reference from
484 * the original value of path->ah (ie
485 * old_ah).
486 */
487 ipoib_put_ah(neigh->ah);
488 }
489 kref_get(&path->ah->ref);
490 neigh->ah = path->ah;
491
492 if (ipoib_cm_enabled(dev, neigh->daddr)) {
493 if (!ipoib_cm_get(neigh))
494 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
495 path,
496 neigh));
497 if (!ipoib_cm_get(neigh)) {
498 ipoib_neigh_free(neigh);
499 continue;
500 }
501 }
502
503 while ((skb = __skb_dequeue(&neigh->queue)))
504 __skb_queue_tail(&skqueue, skb);
505 }
506 path->valid = 1;
507 }
508
509 path->query = NULL;
510 complete(&path->done);
511
512 spin_unlock_irqrestore(&priv->lock, flags);
513
514 if (IS_ERR_OR_NULL(ah))
515 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
516
517 if (old_ah)
518 ipoib_put_ah(old_ah);
519
520 while ((skb = __skb_dequeue(&skqueue))) {
521 skb->dev = dev;
522 if (dev_queue_xmit(skb))
523 ipoib_warn(priv, "dev_queue_xmit failed "
524 "to requeue packet\n");
525 }
526 }
527
528 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
529 {
530 struct ipoib_dev_priv *priv = netdev_priv(dev);
531 struct ipoib_path *path;
532
533 if (!priv->broadcast)
534 return NULL;
535
536 path = kzalloc(sizeof *path, GFP_ATOMIC);
537 if (!path)
538 return NULL;
539
540 path->dev = dev;
541
542 skb_queue_head_init(&path->queue);
543
544 INIT_LIST_HEAD(&path->neigh_list);
545
546 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
547 path->pathrec.sgid = priv->local_gid;
548 path->pathrec.pkey = cpu_to_be16(priv->pkey);
549 path->pathrec.numb_path = 1;
550 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
551
552 return path;
553 }
554
555 static int path_rec_start(struct net_device *dev,
556 struct ipoib_path *path)
557 {
558 struct ipoib_dev_priv *priv = netdev_priv(dev);
559
560 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
561 path->pathrec.dgid.raw);
562
563 init_completion(&path->done);
564
565 path->query_id =
566 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
567 &path->pathrec,
568 IB_SA_PATH_REC_DGID |
569 IB_SA_PATH_REC_SGID |
570 IB_SA_PATH_REC_NUMB_PATH |
571 IB_SA_PATH_REC_TRAFFIC_CLASS |
572 IB_SA_PATH_REC_PKEY,
573 1000, GFP_ATOMIC,
574 path_rec_completion,
575 path, &path->query);
576 if (path->query_id < 0) {
577 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
578 path->query = NULL;
579 complete(&path->done);
580 return path->query_id;
581 }
582
583 return 0;
584 }
585
586 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
587 struct net_device *dev)
588 {
589 struct ipoib_dev_priv *priv = netdev_priv(dev);
590 struct ipoib_path *path;
591 struct ipoib_neigh *neigh;
592 unsigned long flags;
593
594 spin_lock_irqsave(&priv->lock, flags);
595 neigh = ipoib_neigh_alloc(daddr, dev);
596 if (!neigh) {
597 spin_unlock_irqrestore(&priv->lock, flags);
598 ++dev->stats.tx_dropped;
599 dev_kfree_skb_any(skb);
600 return;
601 }
602
603 path = __path_find(dev, daddr + 4);
604 if (!path) {
605 path = path_rec_create(dev, daddr + 4);
606 if (!path)
607 goto err_path;
608
609 __path_add(dev, path);
610 }
611
612 list_add_tail(&neigh->list, &path->neigh_list);
613
614 if (path->ah) {
615 kref_get(&path->ah->ref);
616 neigh->ah = path->ah;
617
618 if (ipoib_cm_enabled(dev, neigh->daddr)) {
619 if (!ipoib_cm_get(neigh))
620 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
621 if (!ipoib_cm_get(neigh)) {
622 ipoib_neigh_free(neigh);
623 goto err_drop;
624 }
625 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
626 __skb_queue_tail(&neigh->queue, skb);
627 else {
628 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
629 skb_queue_len(&neigh->queue));
630 goto err_drop;
631 }
632 } else {
633 spin_unlock_irqrestore(&priv->lock, flags);
634 ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
635 ipoib_neigh_put(neigh);
636 return;
637 }
638 } else {
639 neigh->ah = NULL;
640
641 if (!path->query && path_rec_start(dev, path))
642 goto err_path;
643 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
644 __skb_queue_tail(&neigh->queue, skb);
645 else
646 goto err_drop;
647 }
648
649 spin_unlock_irqrestore(&priv->lock, flags);
650 ipoib_neigh_put(neigh);
651 return;
652
653 err_path:
654 ipoib_neigh_free(neigh);
655 err_drop:
656 ++dev->stats.tx_dropped;
657 dev_kfree_skb_any(skb);
658
659 spin_unlock_irqrestore(&priv->lock, flags);
660 ipoib_neigh_put(neigh);
661 }
662
663 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
664 struct ipoib_cb *cb)
665 {
666 struct ipoib_dev_priv *priv = netdev_priv(dev);
667 struct ipoib_path *path;
668 unsigned long flags;
669
670 spin_lock_irqsave(&priv->lock, flags);
671
672 path = __path_find(dev, cb->hwaddr + 4);
673 if (!path || !path->valid) {
674 int new_path = 0;
675
676 if (!path) {
677 path = path_rec_create(dev, cb->hwaddr + 4);
678 new_path = 1;
679 }
680 if (path) {
681 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
682 __skb_queue_tail(&path->queue, skb);
683 } else {
684 ++dev->stats.tx_dropped;
685 dev_kfree_skb_any(skb);
686 }
687
688 if (!path->query && path_rec_start(dev, path)) {
689 spin_unlock_irqrestore(&priv->lock, flags);
690 if (new_path)
691 path_free(dev, path);
692 return;
693 } else
694 __path_add(dev, path);
695 } else {
696 ++dev->stats.tx_dropped;
697 dev_kfree_skb_any(skb);
698 }
699
700 spin_unlock_irqrestore(&priv->lock, flags);
701 return;
702 }
703
704 if (path->ah) {
705 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
706 be16_to_cpu(path->pathrec.dlid));
707
708 spin_unlock_irqrestore(&priv->lock, flags);
709 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
710 return;
711 } else if ((path->query || !path_rec_start(dev, path)) &&
712 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
713 __skb_queue_tail(&path->queue, skb);
714 } else {
715 ++dev->stats.tx_dropped;
716 dev_kfree_skb_any(skb);
717 }
718
719 spin_unlock_irqrestore(&priv->lock, flags);
720 }
721
722 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
723 {
724 struct ipoib_dev_priv *priv = netdev_priv(dev);
725 struct ipoib_neigh *neigh;
726 struct ipoib_cb *cb = ipoib_skb_cb(skb);
727 struct ipoib_header *header;
728 unsigned long flags;
729
730 header = (struct ipoib_header *) skb->data;
731
732 if (unlikely(cb->hwaddr[4] == 0xff)) {
733 /* multicast, arrange "if" according to probability */
734 if ((header->proto != htons(ETH_P_IP)) &&
735 (header->proto != htons(ETH_P_IPV6)) &&
736 (header->proto != htons(ETH_P_ARP)) &&
737 (header->proto != htons(ETH_P_RARP)) &&
738 (header->proto != htons(ETH_P_TIPC))) {
739 /* ethertype not supported by IPoIB */
740 ++dev->stats.tx_dropped;
741 dev_kfree_skb_any(skb);
742 return NETDEV_TX_OK;
743 }
744 /* Add in the P_Key for multicast*/
745 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
746 cb->hwaddr[9] = priv->pkey & 0xff;
747
748 neigh = ipoib_neigh_get(dev, cb->hwaddr);
749 if (likely(neigh))
750 goto send_using_neigh;
751 ipoib_mcast_send(dev, cb->hwaddr, skb);
752 return NETDEV_TX_OK;
753 }
754
755 /* unicast, arrange "switch" according to probability */
756 switch (header->proto) {
757 case htons(ETH_P_IP):
758 case htons(ETH_P_IPV6):
759 case htons(ETH_P_TIPC):
760 neigh = ipoib_neigh_get(dev, cb->hwaddr);
761 if (unlikely(!neigh)) {
762 neigh_add_path(skb, cb->hwaddr, dev);
763 return NETDEV_TX_OK;
764 }
765 break;
766 case htons(ETH_P_ARP):
767 case htons(ETH_P_RARP):
768 /* for unicast ARP and RARP should always perform path find */
769 unicast_arp_send(skb, dev, cb);
770 return NETDEV_TX_OK;
771 default:
772 /* ethertype not supported by IPoIB */
773 ++dev->stats.tx_dropped;
774 dev_kfree_skb_any(skb);
775 return NETDEV_TX_OK;
776 }
777
778 send_using_neigh:
779 /* note we now hold a ref to neigh */
780 if (ipoib_cm_get(neigh)) {
781 if (ipoib_cm_up(neigh)) {
782 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
783 goto unref;
784 }
785 } else if (neigh->ah) {
786 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
787 goto unref;
788 }
789
790 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
791 spin_lock_irqsave(&priv->lock, flags);
792 __skb_queue_tail(&neigh->queue, skb);
793 spin_unlock_irqrestore(&priv->lock, flags);
794 } else {
795 ++dev->stats.tx_dropped;
796 dev_kfree_skb_any(skb);
797 }
798
799 unref:
800 ipoib_neigh_put(neigh);
801
802 return NETDEV_TX_OK;
803 }
804
805 static void ipoib_timeout(struct net_device *dev)
806 {
807 struct ipoib_dev_priv *priv = netdev_priv(dev);
808
809 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
810 jiffies_to_msecs(jiffies - dev->trans_start));
811 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
812 netif_queue_stopped(dev),
813 priv->tx_head, priv->tx_tail);
814 /* XXX reset QP, etc. */
815 }
816
817 static int ipoib_hard_header(struct sk_buff *skb,
818 struct net_device *dev,
819 unsigned short type,
820 const void *daddr, const void *saddr, unsigned len)
821 {
822 struct ipoib_header *header;
823 struct ipoib_cb *cb = ipoib_skb_cb(skb);
824
825 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
826
827 header->proto = htons(type);
828 header->reserved = 0;
829
830 /*
831 * we don't rely on dst_entry structure, always stuff the
832 * destination address into skb->cb so we can figure out where
833 * to send the packet later.
834 */
835 memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
836
837 return sizeof *header;
838 }
839
840 static void ipoib_set_mcast_list(struct net_device *dev)
841 {
842 struct ipoib_dev_priv *priv = netdev_priv(dev);
843
844 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
845 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
846 return;
847 }
848
849 queue_work(priv->wq, &priv->restart_task);
850 }
851
852 static int ipoib_get_iflink(const struct net_device *dev)
853 {
854 struct ipoib_dev_priv *priv = netdev_priv(dev);
855
856 /* parent interface */
857 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
858 return dev->ifindex;
859
860 /* child/vlan interface */
861 return priv->parent->ifindex;
862 }
863
864 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
865 {
866 /*
867 * Use only the address parts that contributes to spreading
868 * The subnet prefix is not used as one can not connect to
869 * same remote port (GUID) using the same remote QPN via two
870 * different subnets.
871 */
872 /* qpn octets[1:4) & port GUID octets[12:20) */
873 u32 *d32 = (u32 *) daddr;
874 u32 hv;
875
876 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
877 return hv & htbl->mask;
878 }
879
880 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
881 {
882 struct ipoib_dev_priv *priv = netdev_priv(dev);
883 struct ipoib_neigh_table *ntbl = &priv->ntbl;
884 struct ipoib_neigh_hash *htbl;
885 struct ipoib_neigh *neigh = NULL;
886 u32 hash_val;
887
888 rcu_read_lock_bh();
889
890 htbl = rcu_dereference_bh(ntbl->htbl);
891
892 if (!htbl)
893 goto out_unlock;
894
895 hash_val = ipoib_addr_hash(htbl, daddr);
896 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
897 neigh != NULL;
898 neigh = rcu_dereference_bh(neigh->hnext)) {
899 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
900 /* found, take one ref on behalf of the caller */
901 if (!atomic_inc_not_zero(&neigh->refcnt)) {
902 /* deleted */
903 neigh = NULL;
904 goto out_unlock;
905 }
906 neigh->alive = jiffies;
907 goto out_unlock;
908 }
909 }
910
911 out_unlock:
912 rcu_read_unlock_bh();
913 return neigh;
914 }
915
916 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
917 {
918 struct ipoib_neigh_table *ntbl = &priv->ntbl;
919 struct ipoib_neigh_hash *htbl;
920 unsigned long neigh_obsolete;
921 unsigned long dt;
922 unsigned long flags;
923 int i;
924
925 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
926 return;
927
928 spin_lock_irqsave(&priv->lock, flags);
929
930 htbl = rcu_dereference_protected(ntbl->htbl,
931 lockdep_is_held(&priv->lock));
932
933 if (!htbl)
934 goto out_unlock;
935
936 /* neigh is obsolete if it was idle for two GC periods */
937 dt = 2 * arp_tbl.gc_interval;
938 neigh_obsolete = jiffies - dt;
939 /* handle possible race condition */
940 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
941 goto out_unlock;
942
943 for (i = 0; i < htbl->size; i++) {
944 struct ipoib_neigh *neigh;
945 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
946
947 while ((neigh = rcu_dereference_protected(*np,
948 lockdep_is_held(&priv->lock))) != NULL) {
949 /* was the neigh idle for two GC periods */
950 if (time_after(neigh_obsolete, neigh->alive)) {
951 rcu_assign_pointer(*np,
952 rcu_dereference_protected(neigh->hnext,
953 lockdep_is_held(&priv->lock)));
954 /* remove from path/mc list */
955 list_del(&neigh->list);
956 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
957 } else {
958 np = &neigh->hnext;
959 }
960
961 }
962 }
963
964 out_unlock:
965 spin_unlock_irqrestore(&priv->lock, flags);
966 }
967
968 static void ipoib_reap_neigh(struct work_struct *work)
969 {
970 struct ipoib_dev_priv *priv =
971 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
972
973 __ipoib_reap_neigh(priv);
974
975 if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
976 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
977 arp_tbl.gc_interval);
978 }
979
980
981 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
982 struct net_device *dev)
983 {
984 struct ipoib_neigh *neigh;
985
986 neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
987 if (!neigh)
988 return NULL;
989
990 neigh->dev = dev;
991 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
992 skb_queue_head_init(&neigh->queue);
993 INIT_LIST_HEAD(&neigh->list);
994 ipoib_cm_set(neigh, NULL);
995 /* one ref on behalf of the caller */
996 atomic_set(&neigh->refcnt, 1);
997
998 return neigh;
999 }
1000
1001 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1002 struct net_device *dev)
1003 {
1004 struct ipoib_dev_priv *priv = netdev_priv(dev);
1005 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1006 struct ipoib_neigh_hash *htbl;
1007 struct ipoib_neigh *neigh;
1008 u32 hash_val;
1009
1010 htbl = rcu_dereference_protected(ntbl->htbl,
1011 lockdep_is_held(&priv->lock));
1012 if (!htbl) {
1013 neigh = NULL;
1014 goto out_unlock;
1015 }
1016
1017 /* need to add a new neigh, but maybe some other thread succeeded?
1018 * recalc hash, maybe hash resize took place so we do a search
1019 */
1020 hash_val = ipoib_addr_hash(htbl, daddr);
1021 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1022 lockdep_is_held(&priv->lock));
1023 neigh != NULL;
1024 neigh = rcu_dereference_protected(neigh->hnext,
1025 lockdep_is_held(&priv->lock))) {
1026 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1027 /* found, take one ref on behalf of the caller */
1028 if (!atomic_inc_not_zero(&neigh->refcnt)) {
1029 /* deleted */
1030 neigh = NULL;
1031 break;
1032 }
1033 neigh->alive = jiffies;
1034 goto out_unlock;
1035 }
1036 }
1037
1038 neigh = ipoib_neigh_ctor(daddr, dev);
1039 if (!neigh)
1040 goto out_unlock;
1041
1042 /* one ref on behalf of the hash table */
1043 atomic_inc(&neigh->refcnt);
1044 neigh->alive = jiffies;
1045 /* put in hash */
1046 rcu_assign_pointer(neigh->hnext,
1047 rcu_dereference_protected(htbl->buckets[hash_val],
1048 lockdep_is_held(&priv->lock)));
1049 rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1050 atomic_inc(&ntbl->entries);
1051
1052 out_unlock:
1053
1054 return neigh;
1055 }
1056
1057 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1058 {
1059 /* neigh reference count was dropprd to zero */
1060 struct net_device *dev = neigh->dev;
1061 struct ipoib_dev_priv *priv = netdev_priv(dev);
1062 struct sk_buff *skb;
1063 if (neigh->ah)
1064 ipoib_put_ah(neigh->ah);
1065 while ((skb = __skb_dequeue(&neigh->queue))) {
1066 ++dev->stats.tx_dropped;
1067 dev_kfree_skb_any(skb);
1068 }
1069 if (ipoib_cm_get(neigh))
1070 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1071 ipoib_dbg(netdev_priv(dev),
1072 "neigh free for %06x %pI6\n",
1073 IPOIB_QPN(neigh->daddr),
1074 neigh->daddr + 4);
1075 kfree(neigh);
1076 if (atomic_dec_and_test(&priv->ntbl.entries)) {
1077 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1078 complete(&priv->ntbl.flushed);
1079 }
1080 }
1081
1082 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1083 {
1084 /* Called as a result of removal from hash table */
1085 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1086 /* note TX context may hold another ref */
1087 ipoib_neigh_put(neigh);
1088 }
1089
1090 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1091 {
1092 struct net_device *dev = neigh->dev;
1093 struct ipoib_dev_priv *priv = netdev_priv(dev);
1094 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1095 struct ipoib_neigh_hash *htbl;
1096 struct ipoib_neigh __rcu **np;
1097 struct ipoib_neigh *n;
1098 u32 hash_val;
1099
1100 htbl = rcu_dereference_protected(ntbl->htbl,
1101 lockdep_is_held(&priv->lock));
1102 if (!htbl)
1103 return;
1104
1105 hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1106 np = &htbl->buckets[hash_val];
1107 for (n = rcu_dereference_protected(*np,
1108 lockdep_is_held(&priv->lock));
1109 n != NULL;
1110 n = rcu_dereference_protected(*np,
1111 lockdep_is_held(&priv->lock))) {
1112 if (n == neigh) {
1113 /* found */
1114 rcu_assign_pointer(*np,
1115 rcu_dereference_protected(neigh->hnext,
1116 lockdep_is_held(&priv->lock)));
1117 /* remove from parent list */
1118 list_del(&neigh->list);
1119 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1120 return;
1121 } else {
1122 np = &n->hnext;
1123 }
1124 }
1125 }
1126
1127 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1128 {
1129 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1130 struct ipoib_neigh_hash *htbl;
1131 struct ipoib_neigh __rcu **buckets;
1132 u32 size;
1133
1134 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1135 ntbl->htbl = NULL;
1136 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1137 if (!htbl)
1138 return -ENOMEM;
1139 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1140 size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1141 buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1142 if (!buckets) {
1143 kfree(htbl);
1144 return -ENOMEM;
1145 }
1146 htbl->size = size;
1147 htbl->mask = (size - 1);
1148 htbl->buckets = buckets;
1149 RCU_INIT_POINTER(ntbl->htbl, htbl);
1150 htbl->ntbl = ntbl;
1151 atomic_set(&ntbl->entries, 0);
1152
1153 /* start garbage collection */
1154 clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1155 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1156 arp_tbl.gc_interval);
1157
1158 return 0;
1159 }
1160
1161 static void neigh_hash_free_rcu(struct rcu_head *head)
1162 {
1163 struct ipoib_neigh_hash *htbl = container_of(head,
1164 struct ipoib_neigh_hash,
1165 rcu);
1166 struct ipoib_neigh __rcu **buckets = htbl->buckets;
1167 struct ipoib_neigh_table *ntbl = htbl->ntbl;
1168
1169 kfree(buckets);
1170 kfree(htbl);
1171 complete(&ntbl->deleted);
1172 }
1173
1174 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1175 {
1176 struct ipoib_dev_priv *priv = netdev_priv(dev);
1177 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1178 struct ipoib_neigh_hash *htbl;
1179 unsigned long flags;
1180 int i;
1181
1182 /* remove all neigh connected to a given path or mcast */
1183 spin_lock_irqsave(&priv->lock, flags);
1184
1185 htbl = rcu_dereference_protected(ntbl->htbl,
1186 lockdep_is_held(&priv->lock));
1187
1188 if (!htbl)
1189 goto out_unlock;
1190
1191 for (i = 0; i < htbl->size; i++) {
1192 struct ipoib_neigh *neigh;
1193 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1194
1195 while ((neigh = rcu_dereference_protected(*np,
1196 lockdep_is_held(&priv->lock))) != NULL) {
1197 /* delete neighs belong to this parent */
1198 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1199 rcu_assign_pointer(*np,
1200 rcu_dereference_protected(neigh->hnext,
1201 lockdep_is_held(&priv->lock)));
1202 /* remove from parent list */
1203 list_del(&neigh->list);
1204 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1205 } else {
1206 np = &neigh->hnext;
1207 }
1208
1209 }
1210 }
1211 out_unlock:
1212 spin_unlock_irqrestore(&priv->lock, flags);
1213 }
1214
1215 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1216 {
1217 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1218 struct ipoib_neigh_hash *htbl;
1219 unsigned long flags;
1220 int i, wait_flushed = 0;
1221
1222 init_completion(&priv->ntbl.flushed);
1223
1224 spin_lock_irqsave(&priv->lock, flags);
1225
1226 htbl = rcu_dereference_protected(ntbl->htbl,
1227 lockdep_is_held(&priv->lock));
1228 if (!htbl)
1229 goto out_unlock;
1230
1231 wait_flushed = atomic_read(&priv->ntbl.entries);
1232 if (!wait_flushed)
1233 goto free_htbl;
1234
1235 for (i = 0; i < htbl->size; i++) {
1236 struct ipoib_neigh *neigh;
1237 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1238
1239 while ((neigh = rcu_dereference_protected(*np,
1240 lockdep_is_held(&priv->lock))) != NULL) {
1241 rcu_assign_pointer(*np,
1242 rcu_dereference_protected(neigh->hnext,
1243 lockdep_is_held(&priv->lock)));
1244 /* remove from path/mc list */
1245 list_del(&neigh->list);
1246 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1247 }
1248 }
1249
1250 free_htbl:
1251 rcu_assign_pointer(ntbl->htbl, NULL);
1252 call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1253
1254 out_unlock:
1255 spin_unlock_irqrestore(&priv->lock, flags);
1256 if (wait_flushed)
1257 wait_for_completion(&priv->ntbl.flushed);
1258 }
1259
1260 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1261 {
1262 struct ipoib_dev_priv *priv = netdev_priv(dev);
1263 int stopped;
1264
1265 ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1266 init_completion(&priv->ntbl.deleted);
1267 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1268
1269 /* Stop GC if called at init fail need to cancel work */
1270 stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1271 if (!stopped)
1272 cancel_delayed_work(&priv->neigh_reap_task);
1273
1274 ipoib_flush_neighs(priv);
1275
1276 wait_for_completion(&priv->ntbl.deleted);
1277 }
1278
1279
1280 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1281 {
1282 struct ipoib_dev_priv *priv = netdev_priv(dev);
1283
1284 /* Allocate RX/TX "rings" to hold queued skbs */
1285 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1286 GFP_KERNEL);
1287 if (!priv->rx_ring) {
1288 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
1289 ca->name, ipoib_recvq_size);
1290 goto out;
1291 }
1292
1293 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1294 if (!priv->tx_ring) {
1295 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1296 ca->name, ipoib_sendq_size);
1297 goto out_rx_ring_cleanup;
1298 }
1299
1300 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1301
1302 if (ipoib_ib_dev_init(dev, ca, port))
1303 goto out_tx_ring_cleanup;
1304
1305 /*
1306 * Must be after ipoib_ib_dev_init so we can allocate a per
1307 * device wq there and use it here
1308 */
1309 if (ipoib_neigh_hash_init(priv) < 0)
1310 goto out_dev_uninit;
1311
1312 return 0;
1313
1314 out_dev_uninit:
1315 ipoib_ib_dev_cleanup(dev);
1316
1317 out_tx_ring_cleanup:
1318 vfree(priv->tx_ring);
1319
1320 out_rx_ring_cleanup:
1321 kfree(priv->rx_ring);
1322
1323 out:
1324 return -ENOMEM;
1325 }
1326
1327 void ipoib_dev_cleanup(struct net_device *dev)
1328 {
1329 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1330 LIST_HEAD(head);
1331
1332 ASSERT_RTNL();
1333
1334 ipoib_delete_debug_files(dev);
1335
1336 /* Delete any child interfaces first */
1337 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1338 /* Stop GC on child */
1339 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1340 cancel_delayed_work(&cpriv->neigh_reap_task);
1341 unregister_netdevice_queue(cpriv->dev, &head);
1342 }
1343 unregister_netdevice_many(&head);
1344
1345 /*
1346 * Must be before ipoib_ib_dev_cleanup or we delete an in use
1347 * work queue
1348 */
1349 ipoib_neigh_hash_uninit(dev);
1350
1351 ipoib_ib_dev_cleanup(dev);
1352
1353 kfree(priv->rx_ring);
1354 vfree(priv->tx_ring);
1355
1356 priv->rx_ring = NULL;
1357 priv->tx_ring = NULL;
1358 }
1359
1360 static const struct header_ops ipoib_header_ops = {
1361 .create = ipoib_hard_header,
1362 };
1363
1364 static const struct net_device_ops ipoib_netdev_ops = {
1365 .ndo_uninit = ipoib_uninit,
1366 .ndo_open = ipoib_open,
1367 .ndo_stop = ipoib_stop,
1368 .ndo_change_mtu = ipoib_change_mtu,
1369 .ndo_fix_features = ipoib_fix_features,
1370 .ndo_start_xmit = ipoib_start_xmit,
1371 .ndo_tx_timeout = ipoib_timeout,
1372 .ndo_set_rx_mode = ipoib_set_mcast_list,
1373 .ndo_get_iflink = ipoib_get_iflink,
1374 };
1375
1376 void ipoib_setup(struct net_device *dev)
1377 {
1378 struct ipoib_dev_priv *priv = netdev_priv(dev);
1379
1380 dev->netdev_ops = &ipoib_netdev_ops;
1381 dev->header_ops = &ipoib_header_ops;
1382
1383 ipoib_set_ethtool_ops(dev);
1384
1385 netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT);
1386
1387 dev->watchdog_timeo = HZ;
1388
1389 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
1390
1391 dev->hard_header_len = IPOIB_ENCAP_LEN;
1392 dev->addr_len = INFINIBAND_ALEN;
1393 dev->type = ARPHRD_INFINIBAND;
1394 dev->tx_queue_len = ipoib_sendq_size * 2;
1395 dev->features = (NETIF_F_VLAN_CHALLENGED |
1396 NETIF_F_HIGHDMA);
1397 netif_keep_dst(dev);
1398
1399 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1400
1401 priv->dev = dev;
1402
1403 spin_lock_init(&priv->lock);
1404
1405 init_rwsem(&priv->vlan_rwsem);
1406
1407 INIT_LIST_HEAD(&priv->path_list);
1408 INIT_LIST_HEAD(&priv->child_intfs);
1409 INIT_LIST_HEAD(&priv->dead_ahs);
1410 INIT_LIST_HEAD(&priv->multicast_list);
1411
1412 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1413 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1414 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
1415 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
1416 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
1417 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1418 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1419 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1420 }
1421
1422 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1423 {
1424 struct net_device *dev;
1425
1426 dev = alloc_netdev((int)sizeof(struct ipoib_dev_priv), name,
1427 NET_NAME_UNKNOWN, ipoib_setup);
1428 if (!dev)
1429 return NULL;
1430
1431 return netdev_priv(dev);
1432 }
1433
1434 static ssize_t show_pkey(struct device *dev,
1435 struct device_attribute *attr, char *buf)
1436 {
1437 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1438
1439 return sprintf(buf, "0x%04x\n", priv->pkey);
1440 }
1441 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1442
1443 static ssize_t show_umcast(struct device *dev,
1444 struct device_attribute *attr, char *buf)
1445 {
1446 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1447
1448 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1449 }
1450
1451 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
1452 {
1453 struct ipoib_dev_priv *priv = netdev_priv(ndev);
1454
1455 if (umcast_val > 0) {
1456 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1457 ipoib_warn(priv, "ignoring multicast groups joined directly "
1458 "by userspace\n");
1459 } else
1460 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1461 }
1462
1463 static ssize_t set_umcast(struct device *dev,
1464 struct device_attribute *attr,
1465 const char *buf, size_t count)
1466 {
1467 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1468
1469 ipoib_set_umcast(to_net_dev(dev), umcast_val);
1470
1471 return count;
1472 }
1473 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1474
1475 int ipoib_add_umcast_attr(struct net_device *dev)
1476 {
1477 return device_create_file(&dev->dev, &dev_attr_umcast);
1478 }
1479
1480 static ssize_t create_child(struct device *dev,
1481 struct device_attribute *attr,
1482 const char *buf, size_t count)
1483 {
1484 int pkey;
1485 int ret;
1486
1487 if (sscanf(buf, "%i", &pkey) != 1)
1488 return -EINVAL;
1489
1490 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
1491 return -EINVAL;
1492
1493 /*
1494 * Set the full membership bit, so that we join the right
1495 * broadcast group, etc.
1496 */
1497 pkey |= 0x8000;
1498
1499 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1500
1501 return ret ? ret : count;
1502 }
1503 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1504
1505 static ssize_t delete_child(struct device *dev,
1506 struct device_attribute *attr,
1507 const char *buf, size_t count)
1508 {
1509 int pkey;
1510 int ret;
1511
1512 if (sscanf(buf, "%i", &pkey) != 1)
1513 return -EINVAL;
1514
1515 if (pkey < 0 || pkey > 0xffff)
1516 return -EINVAL;
1517
1518 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1519
1520 return ret ? ret : count;
1521
1522 }
1523 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1524
1525 int ipoib_add_pkey_attr(struct net_device *dev)
1526 {
1527 return device_create_file(&dev->dev, &dev_attr_pkey);
1528 }
1529
1530 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1531 {
1532 struct ib_device_attr *device_attr;
1533 int result = -ENOMEM;
1534
1535 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1536 if (!device_attr) {
1537 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1538 hca->name, sizeof *device_attr);
1539 return result;
1540 }
1541
1542 result = ib_query_device(hca, device_attr);
1543 if (result) {
1544 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1545 hca->name, result);
1546 kfree(device_attr);
1547 return result;
1548 }
1549 priv->hca_caps = device_attr->device_cap_flags;
1550
1551 kfree(device_attr);
1552
1553 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1554 priv->dev->hw_features = NETIF_F_SG |
1555 NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1556
1557 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1558 priv->dev->hw_features |= NETIF_F_TSO;
1559
1560 priv->dev->features |= priv->dev->hw_features;
1561 }
1562
1563 return 0;
1564 }
1565
1566 static struct net_device *ipoib_add_port(const char *format,
1567 struct ib_device *hca, u8 port)
1568 {
1569 struct ipoib_dev_priv *priv;
1570 struct ib_port_attr attr;
1571 int result = -ENOMEM;
1572
1573 priv = ipoib_intf_alloc(format);
1574 if (!priv)
1575 goto alloc_mem_failed;
1576
1577 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1578 priv->dev->dev_id = port - 1;
1579
1580 result = ib_query_port(hca, port, &attr);
1581 if (!result)
1582 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1583 else {
1584 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1585 hca->name, port);
1586 goto device_init_failed;
1587 }
1588
1589 /* MTU will be reset when mcast join happens */
1590 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1591 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
1592
1593 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1594
1595 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1596 if (result) {
1597 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1598 hca->name, port, result);
1599 goto device_init_failed;
1600 }
1601
1602 result = ipoib_set_dev_features(priv, hca);
1603 if (result)
1604 goto device_init_failed;
1605
1606 /*
1607 * Set the full membership bit, so that we join the right
1608 * broadcast group, etc.
1609 */
1610 priv->pkey |= 0x8000;
1611
1612 priv->dev->broadcast[8] = priv->pkey >> 8;
1613 priv->dev->broadcast[9] = priv->pkey & 0xff;
1614
1615 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1616 if (result) {
1617 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1618 hca->name, port, result);
1619 goto device_init_failed;
1620 } else
1621 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1622
1623 result = ipoib_dev_init(priv->dev, hca, port);
1624 if (result < 0) {
1625 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1626 hca->name, port, result);
1627 goto device_init_failed;
1628 }
1629
1630 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1631 priv->ca, ipoib_event);
1632 result = ib_register_event_handler(&priv->event_handler);
1633 if (result < 0) {
1634 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1635 "port %d (ret = %d)\n",
1636 hca->name, port, result);
1637 goto event_failed;
1638 }
1639
1640 result = register_netdev(priv->dev);
1641 if (result) {
1642 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1643 hca->name, port, result);
1644 goto register_failed;
1645 }
1646
1647 ipoib_create_debug_files(priv->dev);
1648
1649 if (ipoib_cm_add_mode_attr(priv->dev))
1650 goto sysfs_failed;
1651 if (ipoib_add_pkey_attr(priv->dev))
1652 goto sysfs_failed;
1653 if (ipoib_add_umcast_attr(priv->dev))
1654 goto sysfs_failed;
1655 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1656 goto sysfs_failed;
1657 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1658 goto sysfs_failed;
1659
1660 return priv->dev;
1661
1662 sysfs_failed:
1663 ipoib_delete_debug_files(priv->dev);
1664 unregister_netdev(priv->dev);
1665
1666 register_failed:
1667 ib_unregister_event_handler(&priv->event_handler);
1668 flush_workqueue(ipoib_workqueue);
1669 /* Stop GC if started before flush */
1670 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1671 cancel_delayed_work(&priv->neigh_reap_task);
1672 flush_workqueue(priv->wq);
1673
1674 event_failed:
1675 ipoib_dev_cleanup(priv->dev);
1676
1677 device_init_failed:
1678 free_netdev(priv->dev);
1679
1680 alloc_mem_failed:
1681 return ERR_PTR(result);
1682 }
1683
1684 static void ipoib_add_one(struct ib_device *device)
1685 {
1686 struct list_head *dev_list;
1687 struct net_device *dev;
1688 struct ipoib_dev_priv *priv;
1689 int p;
1690 int count = 0;
1691
1692 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1693 if (!dev_list)
1694 return;
1695
1696 INIT_LIST_HEAD(dev_list);
1697
1698 for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
1699 if (!rdma_protocol_ib(device, p))
1700 continue;
1701 dev = ipoib_add_port("ib%d", device, p);
1702 if (!IS_ERR(dev)) {
1703 priv = netdev_priv(dev);
1704 list_add_tail(&priv->list, dev_list);
1705 count++;
1706 }
1707 }
1708
1709 if (!count) {
1710 kfree(dev_list);
1711 return;
1712 }
1713
1714 ib_set_client_data(device, &ipoib_client, dev_list);
1715 }
1716
1717 static void ipoib_remove_one(struct ib_device *device)
1718 {
1719 struct ipoib_dev_priv *priv, *tmp;
1720 struct list_head *dev_list;
1721
1722 dev_list = ib_get_client_data(device, &ipoib_client);
1723 if (!dev_list)
1724 return;
1725
1726 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1727 ib_unregister_event_handler(&priv->event_handler);
1728 flush_workqueue(ipoib_workqueue);
1729
1730 rtnl_lock();
1731 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1732 rtnl_unlock();
1733
1734 /* Stop GC */
1735 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1736 cancel_delayed_work(&priv->neigh_reap_task);
1737 flush_workqueue(priv->wq);
1738
1739 unregister_netdev(priv->dev);
1740 free_netdev(priv->dev);
1741 }
1742
1743 kfree(dev_list);
1744 }
1745
1746 static int __init ipoib_init_module(void)
1747 {
1748 int ret;
1749
1750 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1751 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1752 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1753
1754 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1755 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1756 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1757 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1758 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1759 #endif
1760
1761 /*
1762 * When copying small received packets, we only copy from the
1763 * linear data part of the SKB, so we rely on this condition.
1764 */
1765 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1766
1767 ret = ipoib_register_debugfs();
1768 if (ret)
1769 return ret;
1770
1771 /*
1772 * We create a global workqueue here that is used for all flush
1773 * operations. However, if you attempt to flush a workqueue
1774 * from a task on that same workqueue, it deadlocks the system.
1775 * We want to be able to flush the tasks associated with a
1776 * specific net device, so we also create a workqueue for each
1777 * netdevice. We queue up the tasks for that device only on
1778 * its private workqueue, and we only queue up flush events
1779 * on our global flush workqueue. This avoids the deadlocks.
1780 */
1781 ipoib_workqueue = create_singlethread_workqueue("ipoib_flush");
1782 if (!ipoib_workqueue) {
1783 ret = -ENOMEM;
1784 goto err_fs;
1785 }
1786
1787 ib_sa_register_client(&ipoib_sa_client);
1788
1789 ret = ib_register_client(&ipoib_client);
1790 if (ret)
1791 goto err_sa;
1792
1793 ret = ipoib_netlink_init();
1794 if (ret)
1795 goto err_client;
1796
1797 return 0;
1798
1799 err_client:
1800 ib_unregister_client(&ipoib_client);
1801
1802 err_sa:
1803 ib_sa_unregister_client(&ipoib_sa_client);
1804 destroy_workqueue(ipoib_workqueue);
1805
1806 err_fs:
1807 ipoib_unregister_debugfs();
1808
1809 return ret;
1810 }
1811
1812 static void __exit ipoib_cleanup_module(void)
1813 {
1814 ipoib_netlink_fini();
1815 ib_unregister_client(&ipoib_client);
1816 ib_sa_unregister_client(&ipoib_sa_client);
1817 ipoib_unregister_debugfs();
1818 destroy_workqueue(ipoib_workqueue);
1819 }
1820
1821 module_init(ipoib_init_module);
1822 module_exit(ipoib_cleanup_module);
Linux kernel - Deliverables
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