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Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
[mirror_ubuntu-artful-kernel.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 #include <net/addrconf.h>
52 #include <linux/inetdevice.h>
53 #include <rdma/ib_cache.h>
54
55 #define DRV_VERSION "1.0.0"
56
57 const char ipoib_driver_version[] = DRV_VERSION;
58
59 MODULE_AUTHOR("Roland Dreier");
60 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
61 MODULE_LICENSE("Dual BSD/GPL");
62 MODULE_VERSION(DRV_VERSION);
63
64 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
65 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
66
67 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
68 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
69 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
70 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
71
72 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
73 int ipoib_debug_level;
74
75 module_param_named(debug_level, ipoib_debug_level, int, 0644);
76 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
77 #endif
78
79 struct ipoib_path_iter {
80 struct net_device *dev;
81 struct ipoib_path path;
82 };
83
84 static const u8 ipv4_bcast_addr[] = {
85 0x00, 0xff, 0xff, 0xff,
86 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
87 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
88 };
89
90 struct workqueue_struct *ipoib_workqueue;
91
92 struct ib_sa_client ipoib_sa_client;
93
94 static void ipoib_add_one(struct ib_device *device);
95 static void ipoib_remove_one(struct ib_device *device, void *client_data);
96 static void ipoib_neigh_reclaim(struct rcu_head *rp);
97 static struct net_device *ipoib_get_net_dev_by_params(
98 struct ib_device *dev, u8 port, u16 pkey,
99 const union ib_gid *gid, const struct sockaddr *addr,
100 void *client_data);
101
102 static struct ib_client ipoib_client = {
103 .name = "ipoib",
104 .add = ipoib_add_one,
105 .remove = ipoib_remove_one,
106 .get_net_dev_by_params = ipoib_get_net_dev_by_params,
107 };
108
109 int ipoib_open(struct net_device *dev)
110 {
111 struct ipoib_dev_priv *priv = netdev_priv(dev);
112
113 ipoib_dbg(priv, "bringing up interface\n");
114
115 netif_carrier_off(dev);
116
117 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
118
119 if (ipoib_ib_dev_open(dev)) {
120 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
121 return 0;
122 goto err_disable;
123 }
124
125 if (ipoib_ib_dev_up(dev))
126 goto err_stop;
127
128 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
129 struct ipoib_dev_priv *cpriv;
130
131 /* Bring up any child interfaces too */
132 down_read(&priv->vlan_rwsem);
133 list_for_each_entry(cpriv, &priv->child_intfs, list) {
134 int flags;
135
136 flags = cpriv->dev->flags;
137 if (flags & IFF_UP)
138 continue;
139
140 dev_change_flags(cpriv->dev, flags | IFF_UP);
141 }
142 up_read(&priv->vlan_rwsem);
143 }
144
145 netif_start_queue(dev);
146
147 return 0;
148
149 err_stop:
150 ipoib_ib_dev_stop(dev);
151
152 err_disable:
153 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
154
155 return -EINVAL;
156 }
157
158 static int ipoib_stop(struct net_device *dev)
159 {
160 struct ipoib_dev_priv *priv = netdev_priv(dev);
161
162 ipoib_dbg(priv, "stopping interface\n");
163
164 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
165
166 netif_stop_queue(dev);
167
168 ipoib_ib_dev_down(dev);
169 ipoib_ib_dev_stop(dev);
170
171 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
172 struct ipoib_dev_priv *cpriv;
173
174 /* Bring down any child interfaces too */
175 down_read(&priv->vlan_rwsem);
176 list_for_each_entry(cpriv, &priv->child_intfs, list) {
177 int flags;
178
179 flags = cpriv->dev->flags;
180 if (!(flags & IFF_UP))
181 continue;
182
183 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
184 }
185 up_read(&priv->vlan_rwsem);
186 }
187
188 return 0;
189 }
190
191 static void ipoib_uninit(struct net_device *dev)
192 {
193 ipoib_dev_cleanup(dev);
194 }
195
196 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
197 {
198 struct ipoib_dev_priv *priv = netdev_priv(dev);
199
200 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
201 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
202
203 return features;
204 }
205
206 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
207 {
208 struct ipoib_dev_priv *priv = netdev_priv(dev);
209
210 /* dev->mtu > 2K ==> connected mode */
211 if (ipoib_cm_admin_enabled(dev)) {
212 if (new_mtu > ipoib_cm_max_mtu(dev))
213 return -EINVAL;
214
215 if (new_mtu > priv->mcast_mtu)
216 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
217 priv->mcast_mtu);
218
219 dev->mtu = new_mtu;
220 return 0;
221 }
222
223 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
224 return -EINVAL;
225
226 priv->admin_mtu = new_mtu;
227
228 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
229
230 return 0;
231 }
232
233 /* Called with an RCU read lock taken */
234 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
235 struct net_device *dev)
236 {
237 struct net *net = dev_net(dev);
238 struct in_device *in_dev;
239 struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
240 struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
241 __be32 ret_addr;
242
243 switch (addr->sa_family) {
244 case AF_INET:
245 in_dev = in_dev_get(dev);
246 if (!in_dev)
247 return false;
248
249 ret_addr = inet_confirm_addr(net, in_dev, 0,
250 addr_in->sin_addr.s_addr,
251 RT_SCOPE_HOST);
252 in_dev_put(in_dev);
253 if (ret_addr)
254 return true;
255
256 break;
257 case AF_INET6:
258 if (IS_ENABLED(CONFIG_IPV6) &&
259 ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
260 return true;
261
262 break;
263 }
264 return false;
265 }
266
267 /**
268 * Find the master net_device on top of the given net_device.
269 * @dev: base IPoIB net_device
270 *
271 * Returns the master net_device with a reference held, or the same net_device
272 * if no master exists.
273 */
274 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
275 {
276 struct net_device *master;
277
278 rcu_read_lock();
279 master = netdev_master_upper_dev_get_rcu(dev);
280 if (master)
281 dev_hold(master);
282 rcu_read_unlock();
283
284 if (master)
285 return master;
286
287 dev_hold(dev);
288 return dev;
289 }
290
291 /**
292 * Find a net_device matching the given address, which is an upper device of
293 * the given net_device.
294 * @addr: IP address to look for.
295 * @dev: base IPoIB net_device
296 *
297 * If found, returns the net_device with a reference held. Otherwise return
298 * NULL.
299 */
300 static struct net_device *ipoib_get_net_dev_match_addr(
301 const struct sockaddr *addr, struct net_device *dev)
302 {
303 struct net_device *upper,
304 *result = NULL;
305 struct list_head *iter;
306
307 rcu_read_lock();
308 if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
309 dev_hold(dev);
310 result = dev;
311 goto out;
312 }
313
314 netdev_for_each_all_upper_dev_rcu(dev, upper, iter) {
315 if (ipoib_is_dev_match_addr_rcu(addr, upper)) {
316 dev_hold(upper);
317 result = upper;
318 break;
319 }
320 }
321 out:
322 rcu_read_unlock();
323 return result;
324 }
325
326 /* returns the number of IPoIB netdevs on top a given ipoib device matching a
327 * pkey_index and address, if one exists.
328 *
329 * @found_net_dev: contains a matching net_device if the return value >= 1,
330 * with a reference held. */
331 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
332 const union ib_gid *gid,
333 u16 pkey_index,
334 const struct sockaddr *addr,
335 int nesting,
336 struct net_device **found_net_dev)
337 {
338 struct ipoib_dev_priv *child_priv;
339 struct net_device *net_dev = NULL;
340 int matches = 0;
341
342 if (priv->pkey_index == pkey_index &&
343 (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
344 if (!addr) {
345 net_dev = ipoib_get_master_net_dev(priv->dev);
346 } else {
347 /* Verify the net_device matches the IP address, as
348 * IPoIB child devices currently share a GID. */
349 net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
350 }
351 if (net_dev) {
352 if (!*found_net_dev)
353 *found_net_dev = net_dev;
354 else
355 dev_put(net_dev);
356 ++matches;
357 }
358 }
359
360 /* Check child interfaces */
361 down_read_nested(&priv->vlan_rwsem, nesting);
362 list_for_each_entry(child_priv, &priv->child_intfs, list) {
363 matches += ipoib_match_gid_pkey_addr(child_priv, gid,
364 pkey_index, addr,
365 nesting + 1,
366 found_net_dev);
367 if (matches > 1)
368 break;
369 }
370 up_read(&priv->vlan_rwsem);
371
372 return matches;
373 }
374
375 /* Returns the number of matching net_devs found (between 0 and 2). Also
376 * return the matching net_device in the @net_dev parameter, holding a
377 * reference to the net_device, if the number of matches >= 1 */
378 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
379 u16 pkey_index,
380 const union ib_gid *gid,
381 const struct sockaddr *addr,
382 struct net_device **net_dev)
383 {
384 struct ipoib_dev_priv *priv;
385 int matches = 0;
386
387 *net_dev = NULL;
388
389 list_for_each_entry(priv, dev_list, list) {
390 if (priv->port != port)
391 continue;
392
393 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
394 addr, 0, net_dev);
395 if (matches > 1)
396 break;
397 }
398
399 return matches;
400 }
401
402 static struct net_device *ipoib_get_net_dev_by_params(
403 struct ib_device *dev, u8 port, u16 pkey,
404 const union ib_gid *gid, const struct sockaddr *addr,
405 void *client_data)
406 {
407 struct net_device *net_dev;
408 struct list_head *dev_list = client_data;
409 u16 pkey_index;
410 int matches;
411 int ret;
412
413 if (!rdma_protocol_ib(dev, port))
414 return NULL;
415
416 ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
417 if (ret)
418 return NULL;
419
420 if (!dev_list)
421 return NULL;
422
423 /* See if we can find a unique device matching the L2 parameters */
424 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
425 gid, NULL, &net_dev);
426
427 switch (matches) {
428 case 0:
429 return NULL;
430 case 1:
431 return net_dev;
432 }
433
434 dev_put(net_dev);
435
436 /* Couldn't find a unique device with L2 parameters only. Use L3
437 * address to uniquely match the net device */
438 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
439 gid, addr, &net_dev);
440 switch (matches) {
441 case 0:
442 return NULL;
443 default:
444 dev_warn_ratelimited(&dev->dev,
445 "duplicate IP address detected\n");
446 /* Fall through */
447 case 1:
448 return net_dev;
449 }
450 }
451
452 int ipoib_set_mode(struct net_device *dev, const char *buf)
453 {
454 struct ipoib_dev_priv *priv = netdev_priv(dev);
455
456 /* flush paths if we switch modes so that connections are restarted */
457 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
458 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
459 ipoib_warn(priv, "enabling connected mode "
460 "will cause multicast packet drops\n");
461 netdev_update_features(dev);
462 dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
463 rtnl_unlock();
464 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
465
466 ipoib_flush_paths(dev);
467 rtnl_lock();
468 return 0;
469 }
470
471 if (!strcmp(buf, "datagram\n")) {
472 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
473 netdev_update_features(dev);
474 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
475 rtnl_unlock();
476 ipoib_flush_paths(dev);
477 rtnl_lock();
478 return 0;
479 }
480
481 return -EINVAL;
482 }
483
484 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
485 {
486 struct ipoib_dev_priv *priv = netdev_priv(dev);
487 struct rb_node *n = priv->path_tree.rb_node;
488 struct ipoib_path *path;
489 int ret;
490
491 while (n) {
492 path = rb_entry(n, struct ipoib_path, rb_node);
493
494 ret = memcmp(gid, path->pathrec.dgid.raw,
495 sizeof (union ib_gid));
496
497 if (ret < 0)
498 n = n->rb_left;
499 else if (ret > 0)
500 n = n->rb_right;
501 else
502 return path;
503 }
504
505 return NULL;
506 }
507
508 static int __path_add(struct net_device *dev, struct ipoib_path *path)
509 {
510 struct ipoib_dev_priv *priv = netdev_priv(dev);
511 struct rb_node **n = &priv->path_tree.rb_node;
512 struct rb_node *pn = NULL;
513 struct ipoib_path *tpath;
514 int ret;
515
516 while (*n) {
517 pn = *n;
518 tpath = rb_entry(pn, struct ipoib_path, rb_node);
519
520 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
521 sizeof (union ib_gid));
522 if (ret < 0)
523 n = &pn->rb_left;
524 else if (ret > 0)
525 n = &pn->rb_right;
526 else
527 return -EEXIST;
528 }
529
530 rb_link_node(&path->rb_node, pn, n);
531 rb_insert_color(&path->rb_node, &priv->path_tree);
532
533 list_add_tail(&path->list, &priv->path_list);
534
535 return 0;
536 }
537
538 static void path_free(struct net_device *dev, struct ipoib_path *path)
539 {
540 struct sk_buff *skb;
541
542 while ((skb = __skb_dequeue(&path->queue)))
543 dev_kfree_skb_irq(skb);
544
545 ipoib_dbg(netdev_priv(dev), "path_free\n");
546
547 /* remove all neigh connected to this path */
548 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
549
550 if (path->ah)
551 ipoib_put_ah(path->ah);
552
553 kfree(path);
554 }
555
556 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
557
558 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
559 {
560 struct ipoib_path_iter *iter;
561
562 iter = kmalloc(sizeof *iter, GFP_KERNEL);
563 if (!iter)
564 return NULL;
565
566 iter->dev = dev;
567 memset(iter->path.pathrec.dgid.raw, 0, 16);
568
569 if (ipoib_path_iter_next(iter)) {
570 kfree(iter);
571 return NULL;
572 }
573
574 return iter;
575 }
576
577 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
578 {
579 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
580 struct rb_node *n;
581 struct ipoib_path *path;
582 int ret = 1;
583
584 spin_lock_irq(&priv->lock);
585
586 n = rb_first(&priv->path_tree);
587
588 while (n) {
589 path = rb_entry(n, struct ipoib_path, rb_node);
590
591 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
592 sizeof (union ib_gid)) < 0) {
593 iter->path = *path;
594 ret = 0;
595 break;
596 }
597
598 n = rb_next(n);
599 }
600
601 spin_unlock_irq(&priv->lock);
602
603 return ret;
604 }
605
606 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
607 struct ipoib_path *path)
608 {
609 *path = iter->path;
610 }
611
612 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
613
614 void ipoib_mark_paths_invalid(struct net_device *dev)
615 {
616 struct ipoib_dev_priv *priv = netdev_priv(dev);
617 struct ipoib_path *path, *tp;
618
619 spin_lock_irq(&priv->lock);
620
621 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
622 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
623 be16_to_cpu(path->pathrec.dlid),
624 path->pathrec.dgid.raw);
625 path->valid = 0;
626 }
627
628 spin_unlock_irq(&priv->lock);
629 }
630
631 void ipoib_flush_paths(struct net_device *dev)
632 {
633 struct ipoib_dev_priv *priv = netdev_priv(dev);
634 struct ipoib_path *path, *tp;
635 LIST_HEAD(remove_list);
636 unsigned long flags;
637
638 netif_tx_lock_bh(dev);
639 spin_lock_irqsave(&priv->lock, flags);
640
641 list_splice_init(&priv->path_list, &remove_list);
642
643 list_for_each_entry(path, &remove_list, list)
644 rb_erase(&path->rb_node, &priv->path_tree);
645
646 list_for_each_entry_safe(path, tp, &remove_list, list) {
647 if (path->query)
648 ib_sa_cancel_query(path->query_id, path->query);
649 spin_unlock_irqrestore(&priv->lock, flags);
650 netif_tx_unlock_bh(dev);
651 wait_for_completion(&path->done);
652 path_free(dev, path);
653 netif_tx_lock_bh(dev);
654 spin_lock_irqsave(&priv->lock, flags);
655 }
656
657 spin_unlock_irqrestore(&priv->lock, flags);
658 netif_tx_unlock_bh(dev);
659 }
660
661 static void path_rec_completion(int status,
662 struct ib_sa_path_rec *pathrec,
663 void *path_ptr)
664 {
665 struct ipoib_path *path = path_ptr;
666 struct net_device *dev = path->dev;
667 struct ipoib_dev_priv *priv = netdev_priv(dev);
668 struct ipoib_ah *ah = NULL;
669 struct ipoib_ah *old_ah = NULL;
670 struct ipoib_neigh *neigh, *tn;
671 struct sk_buff_head skqueue;
672 struct sk_buff *skb;
673 unsigned long flags;
674
675 if (!status)
676 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
677 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
678 else
679 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
680 status, path->pathrec.dgid.raw);
681
682 skb_queue_head_init(&skqueue);
683
684 if (!status) {
685 struct ib_ah_attr av;
686
687 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
688 ah = ipoib_create_ah(dev, priv->pd, &av);
689 }
690
691 spin_lock_irqsave(&priv->lock, flags);
692
693 if (!IS_ERR_OR_NULL(ah)) {
694 path->pathrec = *pathrec;
695
696 old_ah = path->ah;
697 path->ah = ah;
698
699 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
700 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
701
702 while ((skb = __skb_dequeue(&path->queue)))
703 __skb_queue_tail(&skqueue, skb);
704
705 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
706 if (neigh->ah) {
707 WARN_ON(neigh->ah != old_ah);
708 /*
709 * Dropping the ah reference inside
710 * priv->lock is safe here, because we
711 * will hold one more reference from
712 * the original value of path->ah (ie
713 * old_ah).
714 */
715 ipoib_put_ah(neigh->ah);
716 }
717 kref_get(&path->ah->ref);
718 neigh->ah = path->ah;
719
720 if (ipoib_cm_enabled(dev, neigh->daddr)) {
721 if (!ipoib_cm_get(neigh))
722 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
723 path,
724 neigh));
725 if (!ipoib_cm_get(neigh)) {
726 ipoib_neigh_free(neigh);
727 continue;
728 }
729 }
730
731 while ((skb = __skb_dequeue(&neigh->queue)))
732 __skb_queue_tail(&skqueue, skb);
733 }
734 path->valid = 1;
735 }
736
737 path->query = NULL;
738 complete(&path->done);
739
740 spin_unlock_irqrestore(&priv->lock, flags);
741
742 if (IS_ERR_OR_NULL(ah))
743 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
744
745 if (old_ah)
746 ipoib_put_ah(old_ah);
747
748 while ((skb = __skb_dequeue(&skqueue))) {
749 skb->dev = dev;
750 if (dev_queue_xmit(skb))
751 ipoib_warn(priv, "dev_queue_xmit failed "
752 "to requeue packet\n");
753 }
754 }
755
756 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
757 {
758 struct ipoib_dev_priv *priv = netdev_priv(dev);
759 struct ipoib_path *path;
760
761 if (!priv->broadcast)
762 return NULL;
763
764 path = kzalloc(sizeof *path, GFP_ATOMIC);
765 if (!path)
766 return NULL;
767
768 path->dev = dev;
769
770 skb_queue_head_init(&path->queue);
771
772 INIT_LIST_HEAD(&path->neigh_list);
773
774 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
775 path->pathrec.sgid = priv->local_gid;
776 path->pathrec.pkey = cpu_to_be16(priv->pkey);
777 path->pathrec.numb_path = 1;
778 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
779
780 return path;
781 }
782
783 static int path_rec_start(struct net_device *dev,
784 struct ipoib_path *path)
785 {
786 struct ipoib_dev_priv *priv = netdev_priv(dev);
787
788 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
789 path->pathrec.dgid.raw);
790
791 init_completion(&path->done);
792
793 path->query_id =
794 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
795 &path->pathrec,
796 IB_SA_PATH_REC_DGID |
797 IB_SA_PATH_REC_SGID |
798 IB_SA_PATH_REC_NUMB_PATH |
799 IB_SA_PATH_REC_TRAFFIC_CLASS |
800 IB_SA_PATH_REC_PKEY,
801 1000, GFP_ATOMIC,
802 path_rec_completion,
803 path, &path->query);
804 if (path->query_id < 0) {
805 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
806 path->query = NULL;
807 complete(&path->done);
808 return path->query_id;
809 }
810
811 return 0;
812 }
813
814 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
815 struct net_device *dev)
816 {
817 struct ipoib_dev_priv *priv = netdev_priv(dev);
818 struct ipoib_path *path;
819 struct ipoib_neigh *neigh;
820 unsigned long flags;
821
822 spin_lock_irqsave(&priv->lock, flags);
823 neigh = ipoib_neigh_alloc(daddr, dev);
824 if (!neigh) {
825 spin_unlock_irqrestore(&priv->lock, flags);
826 ++dev->stats.tx_dropped;
827 dev_kfree_skb_any(skb);
828 return;
829 }
830
831 path = __path_find(dev, daddr + 4);
832 if (!path) {
833 path = path_rec_create(dev, daddr + 4);
834 if (!path)
835 goto err_path;
836
837 __path_add(dev, path);
838 }
839
840 list_add_tail(&neigh->list, &path->neigh_list);
841
842 if (path->ah) {
843 kref_get(&path->ah->ref);
844 neigh->ah = path->ah;
845
846 if (ipoib_cm_enabled(dev, neigh->daddr)) {
847 if (!ipoib_cm_get(neigh))
848 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
849 if (!ipoib_cm_get(neigh)) {
850 ipoib_neigh_free(neigh);
851 goto err_drop;
852 }
853 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
854 __skb_queue_tail(&neigh->queue, skb);
855 else {
856 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
857 skb_queue_len(&neigh->queue));
858 goto err_drop;
859 }
860 } else {
861 spin_unlock_irqrestore(&priv->lock, flags);
862 ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
863 ipoib_neigh_put(neigh);
864 return;
865 }
866 } else {
867 neigh->ah = NULL;
868
869 if (!path->query && path_rec_start(dev, path))
870 goto err_path;
871 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
872 __skb_queue_tail(&neigh->queue, skb);
873 else
874 goto err_drop;
875 }
876
877 spin_unlock_irqrestore(&priv->lock, flags);
878 ipoib_neigh_put(neigh);
879 return;
880
881 err_path:
882 ipoib_neigh_free(neigh);
883 err_drop:
884 ++dev->stats.tx_dropped;
885 dev_kfree_skb_any(skb);
886
887 spin_unlock_irqrestore(&priv->lock, flags);
888 ipoib_neigh_put(neigh);
889 }
890
891 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
892 struct ipoib_cb *cb)
893 {
894 struct ipoib_dev_priv *priv = netdev_priv(dev);
895 struct ipoib_path *path;
896 unsigned long flags;
897
898 spin_lock_irqsave(&priv->lock, flags);
899
900 path = __path_find(dev, cb->hwaddr + 4);
901 if (!path || !path->valid) {
902 int new_path = 0;
903
904 if (!path) {
905 path = path_rec_create(dev, cb->hwaddr + 4);
906 new_path = 1;
907 }
908 if (path) {
909 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
910 __skb_queue_tail(&path->queue, skb);
911 } else {
912 ++dev->stats.tx_dropped;
913 dev_kfree_skb_any(skb);
914 }
915
916 if (!path->query && path_rec_start(dev, path)) {
917 spin_unlock_irqrestore(&priv->lock, flags);
918 if (new_path)
919 path_free(dev, path);
920 return;
921 } else
922 __path_add(dev, path);
923 } else {
924 ++dev->stats.tx_dropped;
925 dev_kfree_skb_any(skb);
926 }
927
928 spin_unlock_irqrestore(&priv->lock, flags);
929 return;
930 }
931
932 if (path->ah) {
933 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
934 be16_to_cpu(path->pathrec.dlid));
935
936 spin_unlock_irqrestore(&priv->lock, flags);
937 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
938 return;
939 } else if ((path->query || !path_rec_start(dev, path)) &&
940 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
941 __skb_queue_tail(&path->queue, skb);
942 } else {
943 ++dev->stats.tx_dropped;
944 dev_kfree_skb_any(skb);
945 }
946
947 spin_unlock_irqrestore(&priv->lock, flags);
948 }
949
950 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
951 {
952 struct ipoib_dev_priv *priv = netdev_priv(dev);
953 struct ipoib_neigh *neigh;
954 struct ipoib_cb *cb = ipoib_skb_cb(skb);
955 struct ipoib_header *header;
956 unsigned long flags;
957
958 header = (struct ipoib_header *) skb->data;
959
960 if (unlikely(cb->hwaddr[4] == 0xff)) {
961 /* multicast, arrange "if" according to probability */
962 if ((header->proto != htons(ETH_P_IP)) &&
963 (header->proto != htons(ETH_P_IPV6)) &&
964 (header->proto != htons(ETH_P_ARP)) &&
965 (header->proto != htons(ETH_P_RARP)) &&
966 (header->proto != htons(ETH_P_TIPC))) {
967 /* ethertype not supported by IPoIB */
968 ++dev->stats.tx_dropped;
969 dev_kfree_skb_any(skb);
970 return NETDEV_TX_OK;
971 }
972 /* Add in the P_Key for multicast*/
973 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
974 cb->hwaddr[9] = priv->pkey & 0xff;
975
976 neigh = ipoib_neigh_get(dev, cb->hwaddr);
977 if (likely(neigh))
978 goto send_using_neigh;
979 ipoib_mcast_send(dev, cb->hwaddr, skb);
980 return NETDEV_TX_OK;
981 }
982
983 /* unicast, arrange "switch" according to probability */
984 switch (header->proto) {
985 case htons(ETH_P_IP):
986 case htons(ETH_P_IPV6):
987 case htons(ETH_P_TIPC):
988 neigh = ipoib_neigh_get(dev, cb->hwaddr);
989 if (unlikely(!neigh)) {
990 neigh_add_path(skb, cb->hwaddr, dev);
991 return NETDEV_TX_OK;
992 }
993 break;
994 case htons(ETH_P_ARP):
995 case htons(ETH_P_RARP):
996 /* for unicast ARP and RARP should always perform path find */
997 unicast_arp_send(skb, dev, cb);
998 return NETDEV_TX_OK;
999 default:
1000 /* ethertype not supported by IPoIB */
1001 ++dev->stats.tx_dropped;
1002 dev_kfree_skb_any(skb);
1003 return NETDEV_TX_OK;
1004 }
1005
1006 send_using_neigh:
1007 /* note we now hold a ref to neigh */
1008 if (ipoib_cm_get(neigh)) {
1009 if (ipoib_cm_up(neigh)) {
1010 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1011 goto unref;
1012 }
1013 } else if (neigh->ah) {
1014 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
1015 goto unref;
1016 }
1017
1018 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1019 spin_lock_irqsave(&priv->lock, flags);
1020 __skb_queue_tail(&neigh->queue, skb);
1021 spin_unlock_irqrestore(&priv->lock, flags);
1022 } else {
1023 ++dev->stats.tx_dropped;
1024 dev_kfree_skb_any(skb);
1025 }
1026
1027 unref:
1028 ipoib_neigh_put(neigh);
1029
1030 return NETDEV_TX_OK;
1031 }
1032
1033 static void ipoib_timeout(struct net_device *dev)
1034 {
1035 struct ipoib_dev_priv *priv = netdev_priv(dev);
1036
1037 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1038 jiffies_to_msecs(jiffies - dev->trans_start));
1039 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
1040 netif_queue_stopped(dev),
1041 priv->tx_head, priv->tx_tail);
1042 /* XXX reset QP, etc. */
1043 }
1044
1045 static int ipoib_hard_header(struct sk_buff *skb,
1046 struct net_device *dev,
1047 unsigned short type,
1048 const void *daddr, const void *saddr, unsigned len)
1049 {
1050 struct ipoib_header *header;
1051 struct ipoib_cb *cb = ipoib_skb_cb(skb);
1052
1053 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
1054
1055 header->proto = htons(type);
1056 header->reserved = 0;
1057
1058 /*
1059 * we don't rely on dst_entry structure, always stuff the
1060 * destination address into skb->cb so we can figure out where
1061 * to send the packet later.
1062 */
1063 memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
1064
1065 return sizeof *header;
1066 }
1067
1068 static void ipoib_set_mcast_list(struct net_device *dev)
1069 {
1070 struct ipoib_dev_priv *priv = netdev_priv(dev);
1071
1072 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1073 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1074 return;
1075 }
1076
1077 queue_work(priv->wq, &priv->restart_task);
1078 }
1079
1080 static int ipoib_get_iflink(const struct net_device *dev)
1081 {
1082 struct ipoib_dev_priv *priv = netdev_priv(dev);
1083
1084 /* parent interface */
1085 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1086 return dev->ifindex;
1087
1088 /* child/vlan interface */
1089 return priv->parent->ifindex;
1090 }
1091
1092 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1093 {
1094 /*
1095 * Use only the address parts that contributes to spreading
1096 * The subnet prefix is not used as one can not connect to
1097 * same remote port (GUID) using the same remote QPN via two
1098 * different subnets.
1099 */
1100 /* qpn octets[1:4) & port GUID octets[12:20) */
1101 u32 *d32 = (u32 *) daddr;
1102 u32 hv;
1103
1104 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1105 return hv & htbl->mask;
1106 }
1107
1108 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1109 {
1110 struct ipoib_dev_priv *priv = netdev_priv(dev);
1111 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1112 struct ipoib_neigh_hash *htbl;
1113 struct ipoib_neigh *neigh = NULL;
1114 u32 hash_val;
1115
1116 rcu_read_lock_bh();
1117
1118 htbl = rcu_dereference_bh(ntbl->htbl);
1119
1120 if (!htbl)
1121 goto out_unlock;
1122
1123 hash_val = ipoib_addr_hash(htbl, daddr);
1124 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1125 neigh != NULL;
1126 neigh = rcu_dereference_bh(neigh->hnext)) {
1127 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1128 /* found, take one ref on behalf of the caller */
1129 if (!atomic_inc_not_zero(&neigh->refcnt)) {
1130 /* deleted */
1131 neigh = NULL;
1132 goto out_unlock;
1133 }
1134 neigh->alive = jiffies;
1135 goto out_unlock;
1136 }
1137 }
1138
1139 out_unlock:
1140 rcu_read_unlock_bh();
1141 return neigh;
1142 }
1143
1144 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1145 {
1146 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1147 struct ipoib_neigh_hash *htbl;
1148 unsigned long neigh_obsolete;
1149 unsigned long dt;
1150 unsigned long flags;
1151 int i;
1152 LIST_HEAD(remove_list);
1153 struct ipoib_mcast *mcast, *tmcast;
1154 struct net_device *dev = priv->dev;
1155
1156 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1157 return;
1158
1159 spin_lock_irqsave(&priv->lock, flags);
1160
1161 htbl = rcu_dereference_protected(ntbl->htbl,
1162 lockdep_is_held(&priv->lock));
1163
1164 if (!htbl)
1165 goto out_unlock;
1166
1167 /* neigh is obsolete if it was idle for two GC periods */
1168 dt = 2 * arp_tbl.gc_interval;
1169 neigh_obsolete = jiffies - dt;
1170 /* handle possible race condition */
1171 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1172 goto out_unlock;
1173
1174 for (i = 0; i < htbl->size; i++) {
1175 struct ipoib_neigh *neigh;
1176 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1177
1178 while ((neigh = rcu_dereference_protected(*np,
1179 lockdep_is_held(&priv->lock))) != NULL) {
1180 /* was the neigh idle for two GC periods */
1181 if (time_after(neigh_obsolete, neigh->alive)) {
1182 u8 *mgid = neigh->daddr + 4;
1183
1184 /* Is this multicast ? */
1185 if (*mgid == 0xff) {
1186 mcast = __ipoib_mcast_find(dev, mgid);
1187
1188 if (mcast && test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
1189 list_del(&mcast->list);
1190 rb_erase(&mcast->rb_node, &priv->multicast_tree);
1191 list_add_tail(&mcast->list, &remove_list);
1192 }
1193 }
1194
1195 rcu_assign_pointer(*np,
1196 rcu_dereference_protected(neigh->hnext,
1197 lockdep_is_held(&priv->lock)));
1198 /* remove from path/mc list */
1199 list_del(&neigh->list);
1200 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1201 } else {
1202 np = &neigh->hnext;
1203 }
1204
1205 }
1206 }
1207
1208 out_unlock:
1209 spin_unlock_irqrestore(&priv->lock, flags);
1210 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
1211 ipoib_mcast_leave(dev, mcast);
1212 ipoib_mcast_free(mcast);
1213 }
1214 }
1215
1216 static void ipoib_reap_neigh(struct work_struct *work)
1217 {
1218 struct ipoib_dev_priv *priv =
1219 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1220
1221 __ipoib_reap_neigh(priv);
1222
1223 if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1224 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1225 arp_tbl.gc_interval);
1226 }
1227
1228
1229 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1230 struct net_device *dev)
1231 {
1232 struct ipoib_neigh *neigh;
1233
1234 neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
1235 if (!neigh)
1236 return NULL;
1237
1238 neigh->dev = dev;
1239 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1240 skb_queue_head_init(&neigh->queue);
1241 INIT_LIST_HEAD(&neigh->list);
1242 ipoib_cm_set(neigh, NULL);
1243 /* one ref on behalf of the caller */
1244 atomic_set(&neigh->refcnt, 1);
1245
1246 return neigh;
1247 }
1248
1249 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1250 struct net_device *dev)
1251 {
1252 struct ipoib_dev_priv *priv = netdev_priv(dev);
1253 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1254 struct ipoib_neigh_hash *htbl;
1255 struct ipoib_neigh *neigh;
1256 u32 hash_val;
1257
1258 htbl = rcu_dereference_protected(ntbl->htbl,
1259 lockdep_is_held(&priv->lock));
1260 if (!htbl) {
1261 neigh = NULL;
1262 goto out_unlock;
1263 }
1264
1265 /* need to add a new neigh, but maybe some other thread succeeded?
1266 * recalc hash, maybe hash resize took place so we do a search
1267 */
1268 hash_val = ipoib_addr_hash(htbl, daddr);
1269 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1270 lockdep_is_held(&priv->lock));
1271 neigh != NULL;
1272 neigh = rcu_dereference_protected(neigh->hnext,
1273 lockdep_is_held(&priv->lock))) {
1274 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1275 /* found, take one ref on behalf of the caller */
1276 if (!atomic_inc_not_zero(&neigh->refcnt)) {
1277 /* deleted */
1278 neigh = NULL;
1279 break;
1280 }
1281 neigh->alive = jiffies;
1282 goto out_unlock;
1283 }
1284 }
1285
1286 neigh = ipoib_neigh_ctor(daddr, dev);
1287 if (!neigh)
1288 goto out_unlock;
1289
1290 /* one ref on behalf of the hash table */
1291 atomic_inc(&neigh->refcnt);
1292 neigh->alive = jiffies;
1293 /* put in hash */
1294 rcu_assign_pointer(neigh->hnext,
1295 rcu_dereference_protected(htbl->buckets[hash_val],
1296 lockdep_is_held(&priv->lock)));
1297 rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1298 atomic_inc(&ntbl->entries);
1299
1300 out_unlock:
1301
1302 return neigh;
1303 }
1304
1305 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1306 {
1307 /* neigh reference count was dropprd to zero */
1308 struct net_device *dev = neigh->dev;
1309 struct ipoib_dev_priv *priv = netdev_priv(dev);
1310 struct sk_buff *skb;
1311 if (neigh->ah)
1312 ipoib_put_ah(neigh->ah);
1313 while ((skb = __skb_dequeue(&neigh->queue))) {
1314 ++dev->stats.tx_dropped;
1315 dev_kfree_skb_any(skb);
1316 }
1317 if (ipoib_cm_get(neigh))
1318 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1319 ipoib_dbg(netdev_priv(dev),
1320 "neigh free for %06x %pI6\n",
1321 IPOIB_QPN(neigh->daddr),
1322 neigh->daddr + 4);
1323 kfree(neigh);
1324 if (atomic_dec_and_test(&priv->ntbl.entries)) {
1325 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1326 complete(&priv->ntbl.flushed);
1327 }
1328 }
1329
1330 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1331 {
1332 /* Called as a result of removal from hash table */
1333 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1334 /* note TX context may hold another ref */
1335 ipoib_neigh_put(neigh);
1336 }
1337
1338 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1339 {
1340 struct net_device *dev = neigh->dev;
1341 struct ipoib_dev_priv *priv = netdev_priv(dev);
1342 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1343 struct ipoib_neigh_hash *htbl;
1344 struct ipoib_neigh __rcu **np;
1345 struct ipoib_neigh *n;
1346 u32 hash_val;
1347
1348 htbl = rcu_dereference_protected(ntbl->htbl,
1349 lockdep_is_held(&priv->lock));
1350 if (!htbl)
1351 return;
1352
1353 hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1354 np = &htbl->buckets[hash_val];
1355 for (n = rcu_dereference_protected(*np,
1356 lockdep_is_held(&priv->lock));
1357 n != NULL;
1358 n = rcu_dereference_protected(*np,
1359 lockdep_is_held(&priv->lock))) {
1360 if (n == neigh) {
1361 /* found */
1362 rcu_assign_pointer(*np,
1363 rcu_dereference_protected(neigh->hnext,
1364 lockdep_is_held(&priv->lock)));
1365 /* remove from parent list */
1366 list_del(&neigh->list);
1367 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1368 return;
1369 } else {
1370 np = &n->hnext;
1371 }
1372 }
1373 }
1374
1375 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1376 {
1377 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1378 struct ipoib_neigh_hash *htbl;
1379 struct ipoib_neigh __rcu **buckets;
1380 u32 size;
1381
1382 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1383 ntbl->htbl = NULL;
1384 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1385 if (!htbl)
1386 return -ENOMEM;
1387 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1388 size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1389 buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1390 if (!buckets) {
1391 kfree(htbl);
1392 return -ENOMEM;
1393 }
1394 htbl->size = size;
1395 htbl->mask = (size - 1);
1396 htbl->buckets = buckets;
1397 RCU_INIT_POINTER(ntbl->htbl, htbl);
1398 htbl->ntbl = ntbl;
1399 atomic_set(&ntbl->entries, 0);
1400
1401 /* start garbage collection */
1402 clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1403 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1404 arp_tbl.gc_interval);
1405
1406 return 0;
1407 }
1408
1409 static void neigh_hash_free_rcu(struct rcu_head *head)
1410 {
1411 struct ipoib_neigh_hash *htbl = container_of(head,
1412 struct ipoib_neigh_hash,
1413 rcu);
1414 struct ipoib_neigh __rcu **buckets = htbl->buckets;
1415 struct ipoib_neigh_table *ntbl = htbl->ntbl;
1416
1417 kfree(buckets);
1418 kfree(htbl);
1419 complete(&ntbl->deleted);
1420 }
1421
1422 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1423 {
1424 struct ipoib_dev_priv *priv = netdev_priv(dev);
1425 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1426 struct ipoib_neigh_hash *htbl;
1427 unsigned long flags;
1428 int i;
1429
1430 /* remove all neigh connected to a given path or mcast */
1431 spin_lock_irqsave(&priv->lock, flags);
1432
1433 htbl = rcu_dereference_protected(ntbl->htbl,
1434 lockdep_is_held(&priv->lock));
1435
1436 if (!htbl)
1437 goto out_unlock;
1438
1439 for (i = 0; i < htbl->size; i++) {
1440 struct ipoib_neigh *neigh;
1441 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1442
1443 while ((neigh = rcu_dereference_protected(*np,
1444 lockdep_is_held(&priv->lock))) != NULL) {
1445 /* delete neighs belong to this parent */
1446 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1447 rcu_assign_pointer(*np,
1448 rcu_dereference_protected(neigh->hnext,
1449 lockdep_is_held(&priv->lock)));
1450 /* remove from parent list */
1451 list_del(&neigh->list);
1452 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1453 } else {
1454 np = &neigh->hnext;
1455 }
1456
1457 }
1458 }
1459 out_unlock:
1460 spin_unlock_irqrestore(&priv->lock, flags);
1461 }
1462
1463 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1464 {
1465 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1466 struct ipoib_neigh_hash *htbl;
1467 unsigned long flags;
1468 int i, wait_flushed = 0;
1469
1470 init_completion(&priv->ntbl.flushed);
1471
1472 spin_lock_irqsave(&priv->lock, flags);
1473
1474 htbl = rcu_dereference_protected(ntbl->htbl,
1475 lockdep_is_held(&priv->lock));
1476 if (!htbl)
1477 goto out_unlock;
1478
1479 wait_flushed = atomic_read(&priv->ntbl.entries);
1480 if (!wait_flushed)
1481 goto free_htbl;
1482
1483 for (i = 0; i < htbl->size; i++) {
1484 struct ipoib_neigh *neigh;
1485 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1486
1487 while ((neigh = rcu_dereference_protected(*np,
1488 lockdep_is_held(&priv->lock))) != NULL) {
1489 rcu_assign_pointer(*np,
1490 rcu_dereference_protected(neigh->hnext,
1491 lockdep_is_held(&priv->lock)));
1492 /* remove from path/mc list */
1493 list_del(&neigh->list);
1494 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1495 }
1496 }
1497
1498 free_htbl:
1499 rcu_assign_pointer(ntbl->htbl, NULL);
1500 call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1501
1502 out_unlock:
1503 spin_unlock_irqrestore(&priv->lock, flags);
1504 if (wait_flushed)
1505 wait_for_completion(&priv->ntbl.flushed);
1506 }
1507
1508 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1509 {
1510 struct ipoib_dev_priv *priv = netdev_priv(dev);
1511 int stopped;
1512
1513 ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1514 init_completion(&priv->ntbl.deleted);
1515 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1516
1517 /* Stop GC if called at init fail need to cancel work */
1518 stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1519 if (!stopped)
1520 cancel_delayed_work(&priv->neigh_reap_task);
1521
1522 ipoib_flush_neighs(priv);
1523
1524 wait_for_completion(&priv->ntbl.deleted);
1525 }
1526
1527
1528 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1529 {
1530 struct ipoib_dev_priv *priv = netdev_priv(dev);
1531
1532 /* Allocate RX/TX "rings" to hold queued skbs */
1533 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1534 GFP_KERNEL);
1535 if (!priv->rx_ring) {
1536 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
1537 ca->name, ipoib_recvq_size);
1538 goto out;
1539 }
1540
1541 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1542 if (!priv->tx_ring) {
1543 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1544 ca->name, ipoib_sendq_size);
1545 goto out_rx_ring_cleanup;
1546 }
1547
1548 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1549
1550 if (ipoib_ib_dev_init(dev, ca, port))
1551 goto out_tx_ring_cleanup;
1552
1553 /*
1554 * Must be after ipoib_ib_dev_init so we can allocate a per
1555 * device wq there and use it here
1556 */
1557 if (ipoib_neigh_hash_init(priv) < 0)
1558 goto out_dev_uninit;
1559
1560 return 0;
1561
1562 out_dev_uninit:
1563 ipoib_ib_dev_cleanup(dev);
1564
1565 out_tx_ring_cleanup:
1566 vfree(priv->tx_ring);
1567
1568 out_rx_ring_cleanup:
1569 kfree(priv->rx_ring);
1570
1571 out:
1572 return -ENOMEM;
1573 }
1574
1575 void ipoib_dev_cleanup(struct net_device *dev)
1576 {
1577 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1578 LIST_HEAD(head);
1579
1580 ASSERT_RTNL();
1581
1582 ipoib_delete_debug_files(dev);
1583
1584 /* Delete any child interfaces first */
1585 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1586 /* Stop GC on child */
1587 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1588 cancel_delayed_work(&cpriv->neigh_reap_task);
1589 unregister_netdevice_queue(cpriv->dev, &head);
1590 }
1591 unregister_netdevice_many(&head);
1592
1593 /*
1594 * Must be before ipoib_ib_dev_cleanup or we delete an in use
1595 * work queue
1596 */
1597 ipoib_neigh_hash_uninit(dev);
1598
1599 ipoib_ib_dev_cleanup(dev);
1600
1601 kfree(priv->rx_ring);
1602 vfree(priv->tx_ring);
1603
1604 priv->rx_ring = NULL;
1605 priv->tx_ring = NULL;
1606 }
1607
1608 static const struct header_ops ipoib_header_ops = {
1609 .create = ipoib_hard_header,
1610 };
1611
1612 static const struct net_device_ops ipoib_netdev_ops = {
1613 .ndo_uninit = ipoib_uninit,
1614 .ndo_open = ipoib_open,
1615 .ndo_stop = ipoib_stop,
1616 .ndo_change_mtu = ipoib_change_mtu,
1617 .ndo_fix_features = ipoib_fix_features,
1618 .ndo_start_xmit = ipoib_start_xmit,
1619 .ndo_tx_timeout = ipoib_timeout,
1620 .ndo_set_rx_mode = ipoib_set_mcast_list,
1621 .ndo_get_iflink = ipoib_get_iflink,
1622 };
1623
1624 void ipoib_setup(struct net_device *dev)
1625 {
1626 struct ipoib_dev_priv *priv = netdev_priv(dev);
1627
1628 dev->netdev_ops = &ipoib_netdev_ops;
1629 dev->header_ops = &ipoib_header_ops;
1630
1631 ipoib_set_ethtool_ops(dev);
1632
1633 netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT);
1634
1635 dev->watchdog_timeo = HZ;
1636
1637 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
1638
1639 dev->hard_header_len = IPOIB_ENCAP_LEN;
1640 dev->addr_len = INFINIBAND_ALEN;
1641 dev->type = ARPHRD_INFINIBAND;
1642 dev->tx_queue_len = ipoib_sendq_size * 2;
1643 dev->features = (NETIF_F_VLAN_CHALLENGED |
1644 NETIF_F_HIGHDMA);
1645 netif_keep_dst(dev);
1646
1647 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1648
1649 priv->dev = dev;
1650
1651 spin_lock_init(&priv->lock);
1652
1653 init_rwsem(&priv->vlan_rwsem);
1654
1655 INIT_LIST_HEAD(&priv->path_list);
1656 INIT_LIST_HEAD(&priv->child_intfs);
1657 INIT_LIST_HEAD(&priv->dead_ahs);
1658 INIT_LIST_HEAD(&priv->multicast_list);
1659
1660 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1661 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1662 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
1663 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
1664 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
1665 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1666 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1667 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1668 }
1669
1670 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1671 {
1672 struct net_device *dev;
1673
1674 dev = alloc_netdev((int)sizeof(struct ipoib_dev_priv), name,
1675 NET_NAME_UNKNOWN, ipoib_setup);
1676 if (!dev)
1677 return NULL;
1678
1679 return netdev_priv(dev);
1680 }
1681
1682 static ssize_t show_pkey(struct device *dev,
1683 struct device_attribute *attr, char *buf)
1684 {
1685 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1686
1687 return sprintf(buf, "0x%04x\n", priv->pkey);
1688 }
1689 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1690
1691 static ssize_t show_umcast(struct device *dev,
1692 struct device_attribute *attr, char *buf)
1693 {
1694 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1695
1696 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1697 }
1698
1699 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
1700 {
1701 struct ipoib_dev_priv *priv = netdev_priv(ndev);
1702
1703 if (umcast_val > 0) {
1704 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1705 ipoib_warn(priv, "ignoring multicast groups joined directly "
1706 "by userspace\n");
1707 } else
1708 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1709 }
1710
1711 static ssize_t set_umcast(struct device *dev,
1712 struct device_attribute *attr,
1713 const char *buf, size_t count)
1714 {
1715 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1716
1717 ipoib_set_umcast(to_net_dev(dev), umcast_val);
1718
1719 return count;
1720 }
1721 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1722
1723 int ipoib_add_umcast_attr(struct net_device *dev)
1724 {
1725 return device_create_file(&dev->dev, &dev_attr_umcast);
1726 }
1727
1728 static ssize_t create_child(struct device *dev,
1729 struct device_attribute *attr,
1730 const char *buf, size_t count)
1731 {
1732 int pkey;
1733 int ret;
1734
1735 if (sscanf(buf, "%i", &pkey) != 1)
1736 return -EINVAL;
1737
1738 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
1739 return -EINVAL;
1740
1741 /*
1742 * Set the full membership bit, so that we join the right
1743 * broadcast group, etc.
1744 */
1745 pkey |= 0x8000;
1746
1747 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1748
1749 return ret ? ret : count;
1750 }
1751 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1752
1753 static ssize_t delete_child(struct device *dev,
1754 struct device_attribute *attr,
1755 const char *buf, size_t count)
1756 {
1757 int pkey;
1758 int ret;
1759
1760 if (sscanf(buf, "%i", &pkey) != 1)
1761 return -EINVAL;
1762
1763 if (pkey < 0 || pkey > 0xffff)
1764 return -EINVAL;
1765
1766 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1767
1768 return ret ? ret : count;
1769
1770 }
1771 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1772
1773 int ipoib_add_pkey_attr(struct net_device *dev)
1774 {
1775 return device_create_file(&dev->dev, &dev_attr_pkey);
1776 }
1777
1778 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1779 {
1780 struct ib_device_attr *device_attr;
1781 int result = -ENOMEM;
1782
1783 device_attr = kmalloc(sizeof *device_attr, GFP_KERNEL);
1784 if (!device_attr) {
1785 printk(KERN_WARNING "%s: allocation of %zu bytes failed\n",
1786 hca->name, sizeof *device_attr);
1787 return result;
1788 }
1789
1790 result = ib_query_device(hca, device_attr);
1791 if (result) {
1792 printk(KERN_WARNING "%s: ib_query_device failed (ret = %d)\n",
1793 hca->name, result);
1794 kfree(device_attr);
1795 return result;
1796 }
1797 priv->hca_caps = device_attr->device_cap_flags;
1798
1799 kfree(device_attr);
1800
1801 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1802 priv->dev->hw_features = NETIF_F_SG |
1803 NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1804
1805 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1806 priv->dev->hw_features |= NETIF_F_TSO;
1807
1808 priv->dev->features |= priv->dev->hw_features;
1809 }
1810
1811 return 0;
1812 }
1813
1814 static struct net_device *ipoib_add_port(const char *format,
1815 struct ib_device *hca, u8 port)
1816 {
1817 struct ipoib_dev_priv *priv;
1818 struct ib_port_attr attr;
1819 int result = -ENOMEM;
1820
1821 priv = ipoib_intf_alloc(format);
1822 if (!priv)
1823 goto alloc_mem_failed;
1824
1825 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1826 priv->dev->dev_id = port - 1;
1827
1828 result = ib_query_port(hca, port, &attr);
1829 if (!result)
1830 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1831 else {
1832 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1833 hca->name, port);
1834 goto device_init_failed;
1835 }
1836
1837 /* MTU will be reset when mcast join happens */
1838 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1839 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
1840
1841 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1842
1843 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1844 if (result) {
1845 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1846 hca->name, port, result);
1847 goto device_init_failed;
1848 }
1849
1850 result = ipoib_set_dev_features(priv, hca);
1851 if (result)
1852 goto device_init_failed;
1853
1854 /*
1855 * Set the full membership bit, so that we join the right
1856 * broadcast group, etc.
1857 */
1858 priv->pkey |= 0x8000;
1859
1860 priv->dev->broadcast[8] = priv->pkey >> 8;
1861 priv->dev->broadcast[9] = priv->pkey & 0xff;
1862
1863 result = ib_query_gid(hca, port, 0, &priv->local_gid, NULL);
1864 if (result) {
1865 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1866 hca->name, port, result);
1867 goto device_init_failed;
1868 } else
1869 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1870
1871 result = ipoib_dev_init(priv->dev, hca, port);
1872 if (result < 0) {
1873 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1874 hca->name, port, result);
1875 goto device_init_failed;
1876 }
1877
1878 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1879 priv->ca, ipoib_event);
1880 result = ib_register_event_handler(&priv->event_handler);
1881 if (result < 0) {
1882 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1883 "port %d (ret = %d)\n",
1884 hca->name, port, result);
1885 goto event_failed;
1886 }
1887
1888 result = register_netdev(priv->dev);
1889 if (result) {
1890 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1891 hca->name, port, result);
1892 goto register_failed;
1893 }
1894
1895 ipoib_create_debug_files(priv->dev);
1896
1897 if (ipoib_cm_add_mode_attr(priv->dev))
1898 goto sysfs_failed;
1899 if (ipoib_add_pkey_attr(priv->dev))
1900 goto sysfs_failed;
1901 if (ipoib_add_umcast_attr(priv->dev))
1902 goto sysfs_failed;
1903 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1904 goto sysfs_failed;
1905 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1906 goto sysfs_failed;
1907
1908 return priv->dev;
1909
1910 sysfs_failed:
1911 ipoib_delete_debug_files(priv->dev);
1912 unregister_netdev(priv->dev);
1913
1914 register_failed:
1915 ib_unregister_event_handler(&priv->event_handler);
1916 flush_workqueue(ipoib_workqueue);
1917 /* Stop GC if started before flush */
1918 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1919 cancel_delayed_work(&priv->neigh_reap_task);
1920 flush_workqueue(priv->wq);
1921
1922 event_failed:
1923 ipoib_dev_cleanup(priv->dev);
1924
1925 device_init_failed:
1926 free_netdev(priv->dev);
1927
1928 alloc_mem_failed:
1929 return ERR_PTR(result);
1930 }
1931
1932 static void ipoib_add_one(struct ib_device *device)
1933 {
1934 struct list_head *dev_list;
1935 struct net_device *dev;
1936 struct ipoib_dev_priv *priv;
1937 int p;
1938 int count = 0;
1939
1940 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1941 if (!dev_list)
1942 return;
1943
1944 INIT_LIST_HEAD(dev_list);
1945
1946 for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
1947 if (!rdma_protocol_ib(device, p))
1948 continue;
1949 dev = ipoib_add_port("ib%d", device, p);
1950 if (!IS_ERR(dev)) {
1951 priv = netdev_priv(dev);
1952 list_add_tail(&priv->list, dev_list);
1953 count++;
1954 }
1955 }
1956
1957 if (!count) {
1958 kfree(dev_list);
1959 return;
1960 }
1961
1962 ib_set_client_data(device, &ipoib_client, dev_list);
1963 }
1964
1965 static void ipoib_remove_one(struct ib_device *device, void *client_data)
1966 {
1967 struct ipoib_dev_priv *priv, *tmp;
1968 struct list_head *dev_list = client_data;
1969
1970 if (!dev_list)
1971 return;
1972
1973 list_for_each_entry_safe(priv, tmp, dev_list, list) {
1974 ib_unregister_event_handler(&priv->event_handler);
1975 flush_workqueue(ipoib_workqueue);
1976
1977 rtnl_lock();
1978 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
1979 rtnl_unlock();
1980
1981 /* Stop GC */
1982 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1983 cancel_delayed_work(&priv->neigh_reap_task);
1984 flush_workqueue(priv->wq);
1985
1986 unregister_netdev(priv->dev);
1987 free_netdev(priv->dev);
1988 }
1989
1990 kfree(dev_list);
1991 }
1992
1993 static int __init ipoib_init_module(void)
1994 {
1995 int ret;
1996
1997 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
1998 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
1999 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2000
2001 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2002 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2003 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2004 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2005 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2006 #endif
2007
2008 /*
2009 * When copying small received packets, we only copy from the
2010 * linear data part of the SKB, so we rely on this condition.
2011 */
2012 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2013
2014 ret = ipoib_register_debugfs();
2015 if (ret)
2016 return ret;
2017
2018 /*
2019 * We create a global workqueue here that is used for all flush
2020 * operations. However, if you attempt to flush a workqueue
2021 * from a task on that same workqueue, it deadlocks the system.
2022 * We want to be able to flush the tasks associated with a
2023 * specific net device, so we also create a workqueue for each
2024 * netdevice. We queue up the tasks for that device only on
2025 * its private workqueue, and we only queue up flush events
2026 * on our global flush workqueue. This avoids the deadlocks.
2027 */
2028 ipoib_workqueue = create_singlethread_workqueue("ipoib_flush");
2029 if (!ipoib_workqueue) {
2030 ret = -ENOMEM;
2031 goto err_fs;
2032 }
2033
2034 ib_sa_register_client(&ipoib_sa_client);
2035
2036 ret = ib_register_client(&ipoib_client);
2037 if (ret)
2038 goto err_sa;
2039
2040 ret = ipoib_netlink_init();
2041 if (ret)
2042 goto err_client;
2043
2044 return 0;
2045
2046 err_client:
2047 ib_unregister_client(&ipoib_client);
2048
2049 err_sa:
2050 ib_sa_unregister_client(&ipoib_sa_client);
2051 destroy_workqueue(ipoib_workqueue);
2052
2053 err_fs:
2054 ipoib_unregister_debugfs();
2055
2056 return ret;
2057 }
2058
2059 static void __exit ipoib_cleanup_module(void)
2060 {
2061 ipoib_netlink_fini();
2062 ib_unregister_client(&ipoib_client);
2063 ib_sa_unregister_client(&ipoib_sa_client);
2064 ipoib_unregister_debugfs();
2065 destroy_workqueue(ipoib_workqueue);
2066 }
2067
2068 module_init(ipoib_init_module);
2069 module_exit(ipoib_cleanup_module);
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