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net: better IFF_XMIT_DST_RELEASE support
[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, 1)) {
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, 1);
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, 1);
161 ipoib_ib_dev_stop(dev, 0);
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_SG | 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
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_path:
652 ipoib_neigh_free(neigh);
653 err_drop:
654 ++dev->stats.tx_dropped;
655 dev_kfree_skb_any(skb);
656
657 spin_unlock_irqrestore(&priv->lock, flags);
658 ipoib_neigh_put(neigh);
659 }
660
661 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
662 struct ipoib_cb *cb)
663 {
664 struct ipoib_dev_priv *priv = netdev_priv(dev);
665 struct ipoib_path *path;
666 unsigned long flags;
667
668 spin_lock_irqsave(&priv->lock, flags);
669
670 path = __path_find(dev, cb->hwaddr + 4);
671 if (!path || !path->valid) {
672 int new_path = 0;
673
674 if (!path) {
675 path = path_rec_create(dev, cb->hwaddr + 4);
676 new_path = 1;
677 }
678 if (path) {
679 __skb_queue_tail(&path->queue, skb);
680
681 if (!path->query && path_rec_start(dev, path)) {
682 spin_unlock_irqrestore(&priv->lock, flags);
683 if (new_path)
684 path_free(dev, path);
685 return;
686 } else
687 __path_add(dev, path);
688 } else {
689 ++dev->stats.tx_dropped;
690 dev_kfree_skb_any(skb);
691 }
692
693 spin_unlock_irqrestore(&priv->lock, flags);
694 return;
695 }
696
697 if (path->ah) {
698 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
699 be16_to_cpu(path->pathrec.dlid));
700
701 spin_unlock_irqrestore(&priv->lock, flags);
702 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
703 return;
704 } else if ((path->query || !path_rec_start(dev, path)) &&
705 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
706 __skb_queue_tail(&path->queue, skb);
707 } else {
708 ++dev->stats.tx_dropped;
709 dev_kfree_skb_any(skb);
710 }
711
712 spin_unlock_irqrestore(&priv->lock, flags);
713 }
714
715 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
716 {
717 struct ipoib_dev_priv *priv = netdev_priv(dev);
718 struct ipoib_neigh *neigh;
719 struct ipoib_cb *cb = ipoib_skb_cb(skb);
720 struct ipoib_header *header;
721 unsigned long flags;
722
723 header = (struct ipoib_header *) skb->data;
724
725 if (unlikely(cb->hwaddr[4] == 0xff)) {
726 /* multicast, arrange "if" according to probability */
727 if ((header->proto != htons(ETH_P_IP)) &&
728 (header->proto != htons(ETH_P_IPV6)) &&
729 (header->proto != htons(ETH_P_ARP)) &&
730 (header->proto != htons(ETH_P_RARP)) &&
731 (header->proto != htons(ETH_P_TIPC))) {
732 /* ethertype not supported by IPoIB */
733 ++dev->stats.tx_dropped;
734 dev_kfree_skb_any(skb);
735 return NETDEV_TX_OK;
736 }
737 /* Add in the P_Key for multicast*/
738 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
739 cb->hwaddr[9] = priv->pkey & 0xff;
740
741 neigh = ipoib_neigh_get(dev, cb->hwaddr);
742 if (likely(neigh))
743 goto send_using_neigh;
744 ipoib_mcast_send(dev, cb->hwaddr, skb);
745 return NETDEV_TX_OK;
746 }
747
748 /* unicast, arrange "switch" according to probability */
749 switch (header->proto) {
750 case htons(ETH_P_IP):
751 case htons(ETH_P_IPV6):
752 case htons(ETH_P_TIPC):
753 neigh = ipoib_neigh_get(dev, cb->hwaddr);
754 if (unlikely(!neigh)) {
755 neigh_add_path(skb, cb->hwaddr, dev);
756 return NETDEV_TX_OK;
757 }
758 break;
759 case htons(ETH_P_ARP):
760 case htons(ETH_P_RARP):
761 /* for unicast ARP and RARP should always perform path find */
762 unicast_arp_send(skb, dev, cb);
763 return NETDEV_TX_OK;
764 default:
765 /* ethertype not supported by IPoIB */
766 ++dev->stats.tx_dropped;
767 dev_kfree_skb_any(skb);
768 return NETDEV_TX_OK;
769 }
770
771 send_using_neigh:
772 /* note we now hold a ref to neigh */
773 if (ipoib_cm_get(neigh)) {
774 if (ipoib_cm_up(neigh)) {
775 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
776 goto unref;
777 }
778 } else if (neigh->ah) {
779 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
780 goto unref;
781 }
782
783 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
784 spin_lock_irqsave(&priv->lock, flags);
785 __skb_queue_tail(&neigh->queue, skb);
786 spin_unlock_irqrestore(&priv->lock, flags);
787 } else {
788 ++dev->stats.tx_dropped;
789 dev_kfree_skb_any(skb);
790 }
791
792 unref:
793 ipoib_neigh_put(neigh);
794
795 return NETDEV_TX_OK;
796 }
797
798 static void ipoib_timeout(struct net_device *dev)
799 {
800 struct ipoib_dev_priv *priv = netdev_priv(dev);
801
802 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
803 jiffies_to_msecs(jiffies - dev->trans_start));
804 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
805 netif_queue_stopped(dev),
806 priv->tx_head, priv->tx_tail);
807 /* XXX reset QP, etc. */
808 }
809
810 static int ipoib_hard_header(struct sk_buff *skb,
811 struct net_device *dev,
812 unsigned short type,
813 const void *daddr, const void *saddr, unsigned len)
814 {
815 struct ipoib_header *header;
816 struct ipoib_cb *cb = ipoib_skb_cb(skb);
817
818 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
819
820 header->proto = htons(type);
821 header->reserved = 0;
822
823 /*
824 * we don't rely on dst_entry structure, always stuff the
825 * destination address into skb->cb so we can figure out where
826 * to send the packet later.
827 */
828 memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
829
830 return sizeof *header;
831 }
832
833 static void ipoib_set_mcast_list(struct net_device *dev)
834 {
835 struct ipoib_dev_priv *priv = netdev_priv(dev);
836
837 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
838 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
839 return;
840 }
841
842 queue_work(ipoib_workqueue, &priv->restart_task);
843 }
844
845 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
846 {
847 /*
848 * Use only the address parts that contributes to spreading
849 * The subnet prefix is not used as one can not connect to
850 * same remote port (GUID) using the same remote QPN via two
851 * different subnets.
852 */
853 /* qpn octets[1:4) & port GUID octets[12:20) */
854 u32 *d32 = (u32 *) daddr;
855 u32 hv;
856
857 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
858 return hv & htbl->mask;
859 }
860
861 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
862 {
863 struct ipoib_dev_priv *priv = netdev_priv(dev);
864 struct ipoib_neigh_table *ntbl = &priv->ntbl;
865 struct ipoib_neigh_hash *htbl;
866 struct ipoib_neigh *neigh = NULL;
867 u32 hash_val;
868
869 rcu_read_lock_bh();
870
871 htbl = rcu_dereference_bh(ntbl->htbl);
872
873 if (!htbl)
874 goto out_unlock;
875
876 hash_val = ipoib_addr_hash(htbl, daddr);
877 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
878 neigh != NULL;
879 neigh = rcu_dereference_bh(neigh->hnext)) {
880 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
881 /* found, take one ref on behalf of the caller */
882 if (!atomic_inc_not_zero(&neigh->refcnt)) {
883 /* deleted */
884 neigh = NULL;
885 goto out_unlock;
886 }
887 neigh->alive = jiffies;
888 goto out_unlock;
889 }
890 }
891
892 out_unlock:
893 rcu_read_unlock_bh();
894 return neigh;
895 }
896
897 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
898 {
899 struct ipoib_neigh_table *ntbl = &priv->ntbl;
900 struct ipoib_neigh_hash *htbl;
901 unsigned long neigh_obsolete;
902 unsigned long dt;
903 unsigned long flags;
904 int i;
905
906 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
907 return;
908
909 spin_lock_irqsave(&priv->lock, flags);
910
911 htbl = rcu_dereference_protected(ntbl->htbl,
912 lockdep_is_held(&priv->lock));
913
914 if (!htbl)
915 goto out_unlock;
916
917 /* neigh is obsolete if it was idle for two GC periods */
918 dt = 2 * arp_tbl.gc_interval;
919 neigh_obsolete = jiffies - dt;
920 /* handle possible race condition */
921 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
922 goto out_unlock;
923
924 for (i = 0; i < htbl->size; i++) {
925 struct ipoib_neigh *neigh;
926 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
927
928 while ((neigh = rcu_dereference_protected(*np,
929 lockdep_is_held(&priv->lock))) != NULL) {
930 /* was the neigh idle for two GC periods */
931 if (time_after(neigh_obsolete, neigh->alive)) {
932 rcu_assign_pointer(*np,
933 rcu_dereference_protected(neigh->hnext,
934 lockdep_is_held(&priv->lock)));
935 /* remove from path/mc list */
936 list_del(&neigh->list);
937 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
938 } else {
939 np = &neigh->hnext;
940 }
941
942 }
943 }
944
945 out_unlock:
946 spin_unlock_irqrestore(&priv->lock, flags);
947 }
948
949 static void ipoib_reap_neigh(struct work_struct *work)
950 {
951 struct ipoib_dev_priv *priv =
952 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
953
954 __ipoib_reap_neigh(priv);
955
956 if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
957 queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
958 arp_tbl.gc_interval);
959 }
960
961
962 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
963 struct net_device *dev)
964 {
965 struct ipoib_neigh *neigh;
966
967 neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
968 if (!neigh)
969 return NULL;
970
971 neigh->dev = dev;
972 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
973 skb_queue_head_init(&neigh->queue);
974 INIT_LIST_HEAD(&neigh->list);
975 ipoib_cm_set(neigh, NULL);
976 /* one ref on behalf of the caller */
977 atomic_set(&neigh->refcnt, 1);
978
979 return neigh;
980 }
981
982 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
983 struct net_device *dev)
984 {
985 struct ipoib_dev_priv *priv = netdev_priv(dev);
986 struct ipoib_neigh_table *ntbl = &priv->ntbl;
987 struct ipoib_neigh_hash *htbl;
988 struct ipoib_neigh *neigh;
989 u32 hash_val;
990
991 htbl = rcu_dereference_protected(ntbl->htbl,
992 lockdep_is_held(&priv->lock));
993 if (!htbl) {
994 neigh = NULL;
995 goto out_unlock;
996 }
997
998 /* need to add a new neigh, but maybe some other thread succeeded?
999 * recalc hash, maybe hash resize took place so we do a search
1000 */
1001 hash_val = ipoib_addr_hash(htbl, daddr);
1002 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1003 lockdep_is_held(&priv->lock));
1004 neigh != NULL;
1005 neigh = rcu_dereference_protected(neigh->hnext,
1006 lockdep_is_held(&priv->lock))) {
1007 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1008 /* found, take one ref on behalf of the caller */
1009 if (!atomic_inc_not_zero(&neigh->refcnt)) {
1010 /* deleted */
1011 neigh = NULL;
1012 break;
1013 }
1014 neigh->alive = jiffies;
1015 goto out_unlock;
1016 }
1017 }
1018
1019 neigh = ipoib_neigh_ctor(daddr, dev);
1020 if (!neigh)
1021 goto out_unlock;
1022
1023 /* one ref on behalf of the hash table */
1024 atomic_inc(&neigh->refcnt);
1025 neigh->alive = jiffies;
1026 /* put in hash */
1027 rcu_assign_pointer(neigh->hnext,
1028 rcu_dereference_protected(htbl->buckets[hash_val],
1029 lockdep_is_held(&priv->lock)));
1030 rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1031 atomic_inc(&ntbl->entries);
1032
1033 out_unlock:
1034
1035 return neigh;
1036 }
1037
1038 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1039 {
1040 /* neigh reference count was dropprd to zero */
1041 struct net_device *dev = neigh->dev;
1042 struct ipoib_dev_priv *priv = netdev_priv(dev);
1043 struct sk_buff *skb;
1044 if (neigh->ah)
1045 ipoib_put_ah(neigh->ah);
1046 while ((skb = __skb_dequeue(&neigh->queue))) {
1047 ++dev->stats.tx_dropped;
1048 dev_kfree_skb_any(skb);
1049 }
1050 if (ipoib_cm_get(neigh))
1051 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1052 ipoib_dbg(netdev_priv(dev),
1053 "neigh free for %06x %pI6\n",
1054 IPOIB_QPN(neigh->daddr),
1055 neigh->daddr + 4);
1056 kfree(neigh);
1057 if (atomic_dec_and_test(&priv->ntbl.entries)) {
1058 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1059 complete(&priv->ntbl.flushed);
1060 }
1061 }
1062
1063 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1064 {
1065 /* Called as a result of removal from hash table */
1066 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1067 /* note TX context may hold another ref */
1068 ipoib_neigh_put(neigh);
1069 }
1070
1071 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1072 {
1073 struct net_device *dev = neigh->dev;
1074 struct ipoib_dev_priv *priv = netdev_priv(dev);
1075 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1076 struct ipoib_neigh_hash *htbl;
1077 struct ipoib_neigh __rcu **np;
1078 struct ipoib_neigh *n;
1079 u32 hash_val;
1080
1081 htbl = rcu_dereference_protected(ntbl->htbl,
1082 lockdep_is_held(&priv->lock));
1083 if (!htbl)
1084 return;
1085
1086 hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1087 np = &htbl->buckets[hash_val];
1088 for (n = rcu_dereference_protected(*np,
1089 lockdep_is_held(&priv->lock));
1090 n != NULL;
1091 n = rcu_dereference_protected(*np,
1092 lockdep_is_held(&priv->lock))) {
1093 if (n == neigh) {
1094 /* found */
1095 rcu_assign_pointer(*np,
1096 rcu_dereference_protected(neigh->hnext,
1097 lockdep_is_held(&priv->lock)));
1098 /* remove from parent list */
1099 list_del(&neigh->list);
1100 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1101 return;
1102 } else {
1103 np = &n->hnext;
1104 }
1105 }
1106 }
1107
1108 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1109 {
1110 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1111 struct ipoib_neigh_hash *htbl;
1112 struct ipoib_neigh **buckets;
1113 u32 size;
1114
1115 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1116 ntbl->htbl = NULL;
1117 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1118 if (!htbl)
1119 return -ENOMEM;
1120 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1121 size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1122 buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1123 if (!buckets) {
1124 kfree(htbl);
1125 return -ENOMEM;
1126 }
1127 htbl->size = size;
1128 htbl->mask = (size - 1);
1129 htbl->buckets = buckets;
1130 ntbl->htbl = htbl;
1131 htbl->ntbl = ntbl;
1132 atomic_set(&ntbl->entries, 0);
1133
1134 /* start garbage collection */
1135 clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1136 queue_delayed_work(ipoib_workqueue, &priv->neigh_reap_task,
1137 arp_tbl.gc_interval);
1138
1139 return 0;
1140 }
1141
1142 static void neigh_hash_free_rcu(struct rcu_head *head)
1143 {
1144 struct ipoib_neigh_hash *htbl = container_of(head,
1145 struct ipoib_neigh_hash,
1146 rcu);
1147 struct ipoib_neigh __rcu **buckets = htbl->buckets;
1148 struct ipoib_neigh_table *ntbl = htbl->ntbl;
1149
1150 kfree(buckets);
1151 kfree(htbl);
1152 complete(&ntbl->deleted);
1153 }
1154
1155 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1156 {
1157 struct ipoib_dev_priv *priv = netdev_priv(dev);
1158 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1159 struct ipoib_neigh_hash *htbl;
1160 unsigned long flags;
1161 int i;
1162
1163 /* remove all neigh connected to a given path or mcast */
1164 spin_lock_irqsave(&priv->lock, flags);
1165
1166 htbl = rcu_dereference_protected(ntbl->htbl,
1167 lockdep_is_held(&priv->lock));
1168
1169 if (!htbl)
1170 goto out_unlock;
1171
1172 for (i = 0; i < htbl->size; i++) {
1173 struct ipoib_neigh *neigh;
1174 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1175
1176 while ((neigh = rcu_dereference_protected(*np,
1177 lockdep_is_held(&priv->lock))) != NULL) {
1178 /* delete neighs belong to this parent */
1179 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1180 rcu_assign_pointer(*np,
1181 rcu_dereference_protected(neigh->hnext,
1182 lockdep_is_held(&priv->lock)));
1183 /* remove from parent list */
1184 list_del(&neigh->list);
1185 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1186 } else {
1187 np = &neigh->hnext;
1188 }
1189
1190 }
1191 }
1192 out_unlock:
1193 spin_unlock_irqrestore(&priv->lock, flags);
1194 }
1195
1196 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1197 {
1198 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1199 struct ipoib_neigh_hash *htbl;
1200 unsigned long flags;
1201 int i, wait_flushed = 0;
1202
1203 init_completion(&priv->ntbl.flushed);
1204
1205 spin_lock_irqsave(&priv->lock, flags);
1206
1207 htbl = rcu_dereference_protected(ntbl->htbl,
1208 lockdep_is_held(&priv->lock));
1209 if (!htbl)
1210 goto out_unlock;
1211
1212 wait_flushed = atomic_read(&priv->ntbl.entries);
1213 if (!wait_flushed)
1214 goto free_htbl;
1215
1216 for (i = 0; i < htbl->size; i++) {
1217 struct ipoib_neigh *neigh;
1218 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1219
1220 while ((neigh = rcu_dereference_protected(*np,
1221 lockdep_is_held(&priv->lock))) != NULL) {
1222 rcu_assign_pointer(*np,
1223 rcu_dereference_protected(neigh->hnext,
1224 lockdep_is_held(&priv->lock)));
1225 /* remove from path/mc list */
1226 list_del(&neigh->list);
1227 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1228 }
1229 }
1230
1231 free_htbl:
1232 rcu_assign_pointer(ntbl->htbl, NULL);
1233 call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1234
1235 out_unlock:
1236 spin_unlock_irqrestore(&priv->lock, flags);
1237 if (wait_flushed)
1238 wait_for_completion(&priv->ntbl.flushed);
1239 }
1240
1241 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1242 {
1243 struct ipoib_dev_priv *priv = netdev_priv(dev);
1244 int stopped;
1245
1246 ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1247 init_completion(&priv->ntbl.deleted);
1248 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1249
1250 /* Stop GC if called at init fail need to cancel work */
1251 stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1252 if (!stopped)
1253 cancel_delayed_work(&priv->neigh_reap_task);
1254
1255 ipoib_flush_neighs(priv);
1256
1257 wait_for_completion(&priv->ntbl.deleted);
1258 }
1259
1260
1261 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1262 {
1263 struct ipoib_dev_priv *priv = netdev_priv(dev);
1264
1265 if (ipoib_neigh_hash_init(priv) < 0)
1266 goto out;
1267 /* Allocate RX/TX "rings" to hold queued skbs */
1268 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1269 GFP_KERNEL);
1270 if (!priv->rx_ring) {
1271 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
1272 ca->name, ipoib_recvq_size);
1273 goto out_neigh_hash_cleanup;
1274 }
1275
1276 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1277 if (!priv->tx_ring) {
1278 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1279 ca->name, ipoib_sendq_size);
1280 goto out_rx_ring_cleanup;
1281 }
1282
1283 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1284
1285 if (ipoib_ib_dev_init(dev, ca, port))
1286 goto out_tx_ring_cleanup;
1287
1288 return 0;
1289
1290 out_tx_ring_cleanup:
1291 vfree(priv->tx_ring);
1292
1293 out_rx_ring_cleanup:
1294 kfree(priv->rx_ring);
1295
1296 out_neigh_hash_cleanup:
1297 ipoib_neigh_hash_uninit(dev);
1298 out:
1299 return -ENOMEM;
1300 }
1301
1302 void ipoib_dev_cleanup(struct net_device *dev)
1303 {
1304 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1305 LIST_HEAD(head);
1306
1307 ASSERT_RTNL();
1308
1309 ipoib_delete_debug_files(dev);
1310
1311 /* Delete any child interfaces first */
1312 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1313 /* Stop GC on child */
1314 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1315 cancel_delayed_work(&cpriv->neigh_reap_task);
1316 unregister_netdevice_queue(cpriv->dev, &head);
1317 }
1318 unregister_netdevice_many(&head);
1319
1320 ipoib_ib_dev_cleanup(dev);
1321
1322 kfree(priv->rx_ring);
1323 vfree(priv->tx_ring);
1324
1325 priv->rx_ring = NULL;
1326 priv->tx_ring = NULL;
1327
1328 ipoib_neigh_hash_uninit(dev);
1329 }
1330
1331 static const struct header_ops ipoib_header_ops = {
1332 .create = ipoib_hard_header,
1333 };
1334
1335 static const struct net_device_ops ipoib_netdev_ops = {
1336 .ndo_uninit = ipoib_uninit,
1337 .ndo_open = ipoib_open,
1338 .ndo_stop = ipoib_stop,
1339 .ndo_change_mtu = ipoib_change_mtu,
1340 .ndo_fix_features = ipoib_fix_features,
1341 .ndo_start_xmit = ipoib_start_xmit,
1342 .ndo_tx_timeout = ipoib_timeout,
1343 .ndo_set_rx_mode = ipoib_set_mcast_list,
1344 };
1345
1346 void ipoib_setup(struct net_device *dev)
1347 {
1348 struct ipoib_dev_priv *priv = netdev_priv(dev);
1349
1350 dev->netdev_ops = &ipoib_netdev_ops;
1351 dev->header_ops = &ipoib_header_ops;
1352
1353 ipoib_set_ethtool_ops(dev);
1354
1355 netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT);
1356
1357 dev->watchdog_timeo = HZ;
1358
1359 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
1360
1361 dev->hard_header_len = IPOIB_ENCAP_LEN;
1362 dev->addr_len = INFINIBAND_ALEN;
1363 dev->type = ARPHRD_INFINIBAND;
1364 dev->tx_queue_len = ipoib_sendq_size * 2;
1365 dev->features = (NETIF_F_VLAN_CHALLENGED |
1366 NETIF_F_HIGHDMA);
1367 netif_keep_dst(dev);
1368
1369 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1370
1371 priv->dev = dev;
1372
1373 spin_lock_init(&priv->lock);
1374
1375 init_rwsem(&priv->vlan_rwsem);
1376
1377 INIT_LIST_HEAD(&priv->path_list);
1378 INIT_LIST_HEAD(&priv->child_intfs);
1379 INIT_LIST_HEAD(&priv->dead_ahs);
1380 INIT_LIST_HEAD(&priv->multicast_list);
1381
1382 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1383 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1384 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
1385 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
1386 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
1387 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1388 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1389 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1390 }
1391
1392 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1393 {
1394 struct net_device *dev;
1395
1396 dev = alloc_netdev((int)sizeof(struct ipoib_dev_priv), name,
1397 NET_NAME_UNKNOWN, ipoib_setup);
1398 if (!dev)
1399 return NULL;
1400
1401 return netdev_priv(dev);
1402 }
1403
1404 static ssize_t show_pkey(struct device *dev,
1405 struct device_attribute *attr, char *buf)
1406 {
1407 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1408
1409 return sprintf(buf, "0x%04x\n", priv->pkey);
1410 }
1411 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1412
1413 static ssize_t show_umcast(struct device *dev,
1414 struct device_attribute *attr, char *buf)
1415 {
1416 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1417
1418 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1419 }
1420
1421 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
1422 {
1423 struct ipoib_dev_priv *priv = netdev_priv(ndev);
1424
1425 if (umcast_val > 0) {
1426 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1427 ipoib_warn(priv, "ignoring multicast groups joined directly "
1428 "by userspace\n");
1429 } else
1430 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1431 }
1432
1433 static ssize_t set_umcast(struct device *dev,
1434 struct device_attribute *attr,
1435 const char *buf, size_t count)
1436 {
1437 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1438
1439 ipoib_set_umcast(to_net_dev(dev), umcast_val);
1440
1441 return count;
1442 }
1443 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1444
1445 int ipoib_add_umcast_attr(struct net_device *dev)
1446 {
1447 return device_create_file(&dev->dev, &dev_attr_umcast);
1448 }
1449
1450 static ssize_t create_child(struct device *dev,
1451 struct device_attribute *attr,
1452 const char *buf, size_t count)
1453 {
1454 int pkey;
1455 int ret;
1456
1457 if (sscanf(buf, "%i", &pkey) != 1)
1458 return -EINVAL;
1459
1460 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
1461 return -EINVAL;
1462
1463 /*
1464 * Set the full membership bit, so that we join the right
1465 * broadcast group, etc.
1466 */
1467 pkey |= 0x8000;
1468
1469 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1470
1471 return ret ? ret : count;
1472 }
1473 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1474
1475 static ssize_t delete_child(struct device *dev,
1476 struct device_attribute *attr,
1477 const char *buf, size_t count)
1478 {
1479 int pkey;
1480 int ret;
1481
1482 if (sscanf(buf, "%i", &pkey) != 1)
1483 return -EINVAL;
1484
1485 if (pkey < 0 || pkey > 0xffff)
1486 return -EINVAL;
1487
1488 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1489
1490 return ret ? ret : count;
1491
1492 }
1493 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1494
1495 int ipoib_add_pkey_attr(struct net_device *dev)
1496 {
1497 return device_create_file(&dev->dev, &dev_attr_pkey);
1498 }
1499
1500 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1501 {
1502 struct ib_device_attr *device_attr;
1503 int result = -ENOMEM;
1504
1505 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1506 if (!device_attr) {
1507 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1508 hca->name, sizeof *device_attr);
1509 return result;
1510 }
1511
1512 result = ib_query_device(hca, device_attr);
1513 if (result) {
1514 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1515 hca->name, result);
1516 kfree(device_attr);
1517 return result;
1518 }
1519 priv->hca_caps = device_attr->device_cap_flags;
1520
1521 kfree(device_attr);
1522
1523 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1524 priv->dev->hw_features = NETIF_F_SG |
1525 NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1526
1527 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1528 priv->dev->hw_features |= NETIF_F_TSO;
1529
1530 priv->dev->features |= priv->dev->hw_features;
1531 }
1532
1533 return 0;
1534 }
1535
1536 static struct net_device *ipoib_add_port(const char *format,
1537 struct ib_device *hca, u8 port)
1538 {
1539 struct ipoib_dev_priv *priv;
1540 struct ib_port_attr attr;
1541 int result = -ENOMEM;
1542
1543 priv = ipoib_intf_alloc(format);
1544 if (!priv)
1545 goto alloc_mem_failed;
1546
1547 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1548 priv->dev->dev_id = port - 1;
1549
1550 if (!ib_query_port(hca, port, &attr))
1551 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1552 else {
1553 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1554 hca->name, port);
1555 goto device_init_failed;
1556 }
1557
1558 /* MTU will be reset when mcast join happens */
1559 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1560 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
1561
1562 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1563
1564 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1565 if (result) {
1566 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1567 hca->name, port, result);
1568 goto device_init_failed;
1569 }
1570
1571 if (ipoib_set_dev_features(priv, hca))
1572 goto device_init_failed;
1573
1574 /*
1575 * Set the full membership bit, so that we join the right
1576 * broadcast group, etc.
1577 */
1578 priv->pkey |= 0x8000;
1579
1580 priv->dev->broadcast[8] = priv->pkey >> 8;
1581 priv->dev->broadcast[9] = priv->pkey & 0xff;
1582
1583 result = ib_query_gid(hca, port, 0, &priv->local_gid);
1584 if (result) {
1585 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1586 hca->name, port, result);
1587 goto device_init_failed;
1588 } else
1589 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1590
1591 result = ipoib_dev_init(priv->dev, hca, port);
1592 if (result < 0) {
1593 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1594 hca->name, port, result);
1595 goto device_init_failed;
1596 }
1597
1598 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1599 priv->ca, ipoib_event);
1600 result = ib_register_event_handler(&priv->event_handler);
1601 if (result < 0) {
1602 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1603 "port %d (ret = %d)\n",
1604 hca->name, port, result);
1605 goto event_failed;
1606 }
1607
1608 result = register_netdev(priv->dev);
1609 if (result) {
1610 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1611 hca->name, port, result);
1612 goto register_failed;
1613 }
1614
1615 ipoib_create_debug_files(priv->dev);
1616
1617 if (ipoib_cm_add_mode_attr(priv->dev))
1618 goto sysfs_failed;
1619 if (ipoib_add_pkey_attr(priv->dev))
1620 goto sysfs_failed;
1621 if (ipoib_add_umcast_attr(priv->dev))
1622 goto sysfs_failed;
1623 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1624 goto sysfs_failed;
1625 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1626 goto sysfs_failed;
1627
1628 return priv->dev;
1629
1630 sysfs_failed:
1631 ipoib_delete_debug_files(priv->dev);
1632 unregister_netdev(priv->dev);
1633
1634 register_failed:
1635 ib_unregister_event_handler(&priv->event_handler);
1636 /* Stop GC if started before flush */
1637 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1638 cancel_delayed_work(&priv->neigh_reap_task);
1639 flush_workqueue(ipoib_workqueue);
1640
1641 event_failed:
1642 ipoib_dev_cleanup(priv->dev);
1643
1644 device_init_failed:
1645 free_netdev(priv->dev);
1646
1647 alloc_mem_failed:
1648 return ERR_PTR(result);
1649 }
1650
1651 static void ipoib_add_one(struct ib_device *device)
1652 {
1653 struct list_head *dev_list;
1654 struct net_device *dev;
1655 struct ipoib_dev_priv *priv;
1656 int s, e, p;
1657
1658 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1659 return;
1660
1661 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1662 if (!dev_list)
1663 return;
1664
1665 INIT_LIST_HEAD(dev_list);
1666
1667 if (device->node_type == RDMA_NODE_IB_SWITCH) {
1668 s = 0;
1669 e = 0;
1670 } else {
1671 s = 1;
1672 e = device->phys_port_cnt;
1673 }
1674
1675 for (p = s; p <= e; ++p) {
1676 if (rdma_port_get_link_layer(device, p) != IB_LINK_LAYER_INFINIBAND)
1677 continue;
1678 dev = ipoib_add_port("ib%d", device, p);
1679 if (!IS_ERR(dev)) {
1680 priv = netdev_priv(dev);
1681 list_add_tail(&priv->list, dev_list);
1682 }
1683 }
1684
1685 ib_set_client_data(device, &ipoib_client, dev_list);
1686 }
1687
1688 static void ipoib_remove_one(struct ib_device *device)
1689 {
1690 struct ipoib_dev_priv *priv, *tmp;
1691 struct list_head *dev_list;
1692
1693 if (rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1694 return;
1695
1696 dev_list = ib_get_client_data(device, &ipoib_client);
1697 if (!dev_list)
1698 return;
1699
1700 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1701 ib_unregister_event_handler(&priv->event_handler);
1702
1703 rtnl_lock();
1704 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1705 rtnl_unlock();
1706
1707 /* Stop GC */
1708 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1709 cancel_delayed_work(&priv->neigh_reap_task);
1710 flush_workqueue(ipoib_workqueue);
1711
1712 unregister_netdev(priv->dev);
1713 free_netdev(priv->dev);
1714 }
1715
1716 kfree(dev_list);
1717 }
1718
1719 static int __init ipoib_init_module(void)
1720 {
1721 int ret;
1722
1723 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1724 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1725 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
1726
1727 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
1728 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
1729 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
1730 #ifdef CONFIG_INFINIBAND_IPOIB_CM
1731 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
1732 #endif
1733
1734 /*
1735 * When copying small received packets, we only copy from the
1736 * linear data part of the SKB, so we rely on this condition.
1737 */
1738 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
1739
1740 ret = ipoib_register_debugfs();
1741 if (ret)
1742 return ret;
1743
1744 /*
1745 * We create our own workqueue mainly because we want to be
1746 * able to flush it when devices are being removed. We can't
1747 * use schedule_work()/flush_scheduled_work() because both
1748 * unregister_netdev() and linkwatch_event take the rtnl lock,
1749 * so flush_scheduled_work() can deadlock during device
1750 * removal.
1751 */
1752 ipoib_workqueue = create_singlethread_workqueue("ipoib");
1753 if (!ipoib_workqueue) {
1754 ret = -ENOMEM;
1755 goto err_fs;
1756 }
1757
1758 ib_sa_register_client(&ipoib_sa_client);
1759
1760 ret = ib_register_client(&ipoib_client);
1761 if (ret)
1762 goto err_sa;
1763
1764 ret = ipoib_netlink_init();
1765 if (ret)
1766 goto err_client;
1767
1768 return 0;
1769
1770 err_client:
1771 ib_unregister_client(&ipoib_client);
1772
1773 err_sa:
1774 ib_sa_unregister_client(&ipoib_sa_client);
1775 destroy_workqueue(ipoib_workqueue);
1776
1777 err_fs:
1778 ipoib_unregister_debugfs();
1779
1780 return ret;
1781 }
1782
1783 static void __exit ipoib_cleanup_module(void)
1784 {
1785 ipoib_netlink_fini();
1786 ib_unregister_client(&ipoib_client);
1787 ib_sa_unregister_client(&ipoib_sa_client);
1788 ipoib_unregister_debugfs();
1789 destroy_workqueue(ipoib_workqueue);
1790 }
1791
1792 module_init(ipoib_init_module);
1793 module_exit(ipoib_cleanup_module);
Linux kernel - Deliverables
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