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