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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
blob80807d6e5c4cff878f25eaf0861c9c8822843676
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 #include <linux/pci.h>
55
56 #define DRV_VERSION "1.0.0"
57
58 const char ipoib_driver_version[] = DRV_VERSION;
59
60 MODULE_AUTHOR("Roland Dreier");
61 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
62 MODULE_LICENSE("Dual BSD/GPL");
63 MODULE_VERSION(DRV_VERSION);
64
65 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
66 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
67
68 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
69 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
70 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
71 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
72
73 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
74 int ipoib_debug_level;
75
76 module_param_named(debug_level, ipoib_debug_level, int, 0644);
77 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
78 #endif
79
80 struct ipoib_path_iter {
81 struct net_device *dev;
82 struct ipoib_path path;
83 };
84
85 static const u8 ipv4_bcast_addr[] = {
86 0x00, 0xff, 0xff, 0xff,
87 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
88 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
89 };
90
91 struct workqueue_struct *ipoib_workqueue;
92
93 struct ib_sa_client ipoib_sa_client;
94
95 static void ipoib_add_one(struct ib_device *device);
96 static void ipoib_remove_one(struct ib_device *device, void *client_data);
97 static void ipoib_neigh_reclaim(struct rcu_head *rp);
98 static struct net_device *ipoib_get_net_dev_by_params(
99 struct ib_device *dev, u8 port, u16 pkey,
100 const union ib_gid *gid, const struct sockaddr *addr,
101 void *client_data);
102
103 static struct ib_client ipoib_client = {
104 .name = "ipoib",
105 .add = ipoib_add_one,
106 .remove = ipoib_remove_one,
107 .get_net_dev_by_params = ipoib_get_net_dev_by_params,
108 };
109
110 int ipoib_open(struct net_device *dev)
111 {
112 struct ipoib_dev_priv *priv = netdev_priv(dev);
113
114 ipoib_dbg(priv, "bringing up interface\n");
115
116 netif_carrier_off(dev);
117
118 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
119
120 if (ipoib_ib_dev_open(dev)) {
121 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
122 return 0;
123 goto err_disable;
124 }
125
126 if (ipoib_ib_dev_up(dev))
127 goto err_stop;
128
129 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
130 struct ipoib_dev_priv *cpriv;
131
132 /* Bring up any child interfaces too */
133 down_read(&priv->vlan_rwsem);
134 list_for_each_entry(cpriv, &priv->child_intfs, list) {
135 int flags;
136
137 flags = cpriv->dev->flags;
138 if (flags & IFF_UP)
139 continue;
140
141 dev_change_flags(cpriv->dev, flags | IFF_UP);
142 }
143 up_read(&priv->vlan_rwsem);
144 }
145
146 netif_start_queue(dev);
147
148 return 0;
149
150 err_stop:
151 ipoib_ib_dev_stop(dev);
152
153 err_disable:
154 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
155
156 return -EINVAL;
157 }
158
159 static int ipoib_stop(struct net_device *dev)
160 {
161 struct ipoib_dev_priv *priv = netdev_priv(dev);
162
163 ipoib_dbg(priv, "stopping interface\n");
164
165 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
166
167 netif_stop_queue(dev);
168
169 ipoib_ib_dev_down(dev);
170 ipoib_ib_dev_stop(dev);
171
172 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
173 struct ipoib_dev_priv *cpriv;
174
175 /* Bring down any child interfaces too */
176 down_read(&priv->vlan_rwsem);
177 list_for_each_entry(cpriv, &priv->child_intfs, list) {
178 int flags;
179
180 flags = cpriv->dev->flags;
181 if (!(flags & IFF_UP))
182 continue;
183
184 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
185 }
186 up_read(&priv->vlan_rwsem);
187 }
188
189 return 0;
190 }
191
192 static void ipoib_uninit(struct net_device *dev)
193 {
194 ipoib_dev_cleanup(dev);
195 }
196
197 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
198 {
199 struct ipoib_dev_priv *priv = netdev_priv(dev);
200
201 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
202 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
203
204 return features;
205 }
206
207 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
208 {
209 struct ipoib_dev_priv *priv = netdev_priv(dev);
210
211 /* dev->mtu > 2K ==> connected mode */
212 if (ipoib_cm_admin_enabled(dev)) {
213 if (new_mtu > ipoib_cm_max_mtu(dev))
214 return -EINVAL;
215
216 if (new_mtu > priv->mcast_mtu)
217 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
218 priv->mcast_mtu);
219
220 dev->mtu = new_mtu;
221 return 0;
222 }
223
224 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
225 return -EINVAL;
226
227 priv->admin_mtu = new_mtu;
228
229 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
230
231 return 0;
232 }
233
234 /* Called with an RCU read lock taken */
235 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
236 struct net_device *dev)
237 {
238 struct net *net = dev_net(dev);
239 struct in_device *in_dev;
240 struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
241 struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
242 __be32 ret_addr;
243
244 switch (addr->sa_family) {
245 case AF_INET:
246 in_dev = in_dev_get(dev);
247 if (!in_dev)
248 return false;
249
250 ret_addr = inet_confirm_addr(net, in_dev, 0,
251 addr_in->sin_addr.s_addr,
252 RT_SCOPE_HOST);
253 in_dev_put(in_dev);
254 if (ret_addr)
255 return true;
256
257 break;
258 case AF_INET6:
259 if (IS_ENABLED(CONFIG_IPV6) &&
260 ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
261 return true;
262
263 break;
264 }
265 return false;
266 }
267
268 /**
269 * Find the master net_device on top of the given net_device.
270 * @dev: base IPoIB net_device
271 *
272 * Returns the master net_device with a reference held, or the same net_device
273 * if no master exists.
274 */
275 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
276 {
277 struct net_device *master;
278
279 rcu_read_lock();
280 master = netdev_master_upper_dev_get_rcu(dev);
281 if (master)
282 dev_hold(master);
283 rcu_read_unlock();
284
285 if (master)
286 return master;
287
288 dev_hold(dev);
289 return dev;
290 }
291
292 /**
293 * Find a net_device matching the given address, which is an upper device of
294 * the given net_device.
295 * @addr: IP address to look for.
296 * @dev: base IPoIB net_device
297 *
298 * If found, returns the net_device with a reference held. Otherwise return
299 * NULL.
300 */
301 static struct net_device *ipoib_get_net_dev_match_addr(
302 const struct sockaddr *addr, struct net_device *dev)
303 {
304 struct net_device *upper,
305 *result = NULL;
306 struct list_head *iter;
307
308 rcu_read_lock();
309 if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
310 dev_hold(dev);
311 result = dev;
312 goto out;
313 }
314
315 netdev_for_each_all_upper_dev_rcu(dev, upper, iter) {
316 if (ipoib_is_dev_match_addr_rcu(addr, upper)) {
317 dev_hold(upper);
318 result = upper;
319 break;
320 }
321 }
322 out:
323 rcu_read_unlock();
324 return result;
325 }
326
327 /* returns the number of IPoIB netdevs on top a given ipoib device matching a
328 * pkey_index and address, if one exists.
329 *
330 * @found_net_dev: contains a matching net_device if the return value >= 1,
331 * with a reference held. */
332 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
333 const union ib_gid *gid,
334 u16 pkey_index,
335 const struct sockaddr *addr,
336 int nesting,
337 struct net_device **found_net_dev)
338 {
339 struct ipoib_dev_priv *child_priv;
340 struct net_device *net_dev = NULL;
341 int matches = 0;
342
343 if (priv->pkey_index == pkey_index &&
344 (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
345 if (!addr) {
346 net_dev = ipoib_get_master_net_dev(priv->dev);
347 } else {
348 /* Verify the net_device matches the IP address, as
349 * IPoIB child devices currently share a GID. */
350 net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
351 }
352 if (net_dev) {
353 if (!*found_net_dev)
354 *found_net_dev = net_dev;
355 else
356 dev_put(net_dev);
357 ++matches;
358 }
359 }
360
361 /* Check child interfaces */
362 down_read_nested(&priv->vlan_rwsem, nesting);
363 list_for_each_entry(child_priv, &priv->child_intfs, list) {
364 matches += ipoib_match_gid_pkey_addr(child_priv, gid,
365 pkey_index, addr,
366 nesting + 1,
367 found_net_dev);
368 if (matches > 1)
369 break;
370 }
371 up_read(&priv->vlan_rwsem);
372
373 return matches;
374 }
375
376 /* Returns the number of matching net_devs found (between 0 and 2). Also
377 * return the matching net_device in the @net_dev parameter, holding a
378 * reference to the net_device, if the number of matches >= 1 */
379 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
380 u16 pkey_index,
381 const union ib_gid *gid,
382 const struct sockaddr *addr,
383 struct net_device **net_dev)
384 {
385 struct ipoib_dev_priv *priv;
386 int matches = 0;
387
388 *net_dev = NULL;
389
390 list_for_each_entry(priv, dev_list, list) {
391 if (priv->port != port)
392 continue;
393
394 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
395 addr, 0, net_dev);
396 if (matches > 1)
397 break;
398 }
399
400 return matches;
401 }
402
403 static struct net_device *ipoib_get_net_dev_by_params(
404 struct ib_device *dev, u8 port, u16 pkey,
405 const union ib_gid *gid, const struct sockaddr *addr,
406 void *client_data)
407 {
408 struct net_device *net_dev;
409 struct list_head *dev_list = client_data;
410 u16 pkey_index;
411 int matches;
412 int ret;
413
414 if (!rdma_protocol_ib(dev, port))
415 return NULL;
416
417 ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
418 if (ret)
419 return NULL;
420
421 if (!dev_list)
422 return NULL;
423
424 /* See if we can find a unique device matching the L2 parameters */
425 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
426 gid, NULL, &net_dev);
427
428 switch (matches) {
429 case 0:
430 return NULL;
431 case 1:
432 return net_dev;
433 }
434
435 dev_put(net_dev);
436
437 /* Couldn't find a unique device with L2 parameters only. Use L3
438 * address to uniquely match the net device */
439 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
440 gid, addr, &net_dev);
441 switch (matches) {
442 case 0:
443 return NULL;
444 default:
445 dev_warn_ratelimited(&dev->dev,
446 "duplicate IP address detected\n");
447 /* Fall through */
448 case 1:
449 return net_dev;
450 }
451 }
452
453 int ipoib_set_mode(struct net_device *dev, const char *buf)
454 {
455 struct ipoib_dev_priv *priv = netdev_priv(dev);
456
457 /* flush paths if we switch modes so that connections are restarted */
458 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
459 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
460 ipoib_warn(priv, "enabling connected mode "
461 "will cause multicast packet drops\n");
462 netdev_update_features(dev);
463 dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
464 rtnl_unlock();
465 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
466
467 ipoib_flush_paths(dev);
468 rtnl_lock();
469 return 0;
470 }
471
472 if (!strcmp(buf, "datagram\n")) {
473 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
474 netdev_update_features(dev);
475 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
476 rtnl_unlock();
477 ipoib_flush_paths(dev);
478 rtnl_lock();
479 return 0;
480 }
481
482 return -EINVAL;
483 }
484
485 static struct ipoib_path *__path_find(struct net_device *dev, void *gid)
486 {
487 struct ipoib_dev_priv *priv = netdev_priv(dev);
488 struct rb_node *n = priv->path_tree.rb_node;
489 struct ipoib_path *path;
490 int ret;
491
492 while (n) {
493 path = rb_entry(n, struct ipoib_path, rb_node);
494
495 ret = memcmp(gid, path->pathrec.dgid.raw,
496 sizeof (union ib_gid));
497
498 if (ret < 0)
499 n = n->rb_left;
500 else if (ret > 0)
501 n = n->rb_right;
502 else
503 return path;
504 }
505
506 return NULL;
507 }
508
509 static int __path_add(struct net_device *dev, struct ipoib_path *path)
510 {
511 struct ipoib_dev_priv *priv = netdev_priv(dev);
512 struct rb_node **n = &priv->path_tree.rb_node;
513 struct rb_node *pn = NULL;
514 struct ipoib_path *tpath;
515 int ret;
516
517 while (*n) {
518 pn = *n;
519 tpath = rb_entry(pn, struct ipoib_path, rb_node);
520
521 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
522 sizeof (union ib_gid));
523 if (ret < 0)
524 n = &pn->rb_left;
525 else if (ret > 0)
526 n = &pn->rb_right;
527 else
528 return -EEXIST;
529 }
530
531 rb_link_node(&path->rb_node, pn, n);
532 rb_insert_color(&path->rb_node, &priv->path_tree);
533
534 list_add_tail(&path->list, &priv->path_list);
535
536 return 0;
537 }
538
539 static void path_free(struct net_device *dev, struct ipoib_path *path)
540 {
541 struct sk_buff *skb;
542
543 while ((skb = __skb_dequeue(&path->queue)))
544 dev_kfree_skb_irq(skb);
545
546 ipoib_dbg(netdev_priv(dev), "path_free\n");
547
548 /* remove all neigh connected to this path */
549 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
550
551 if (path->ah)
552 ipoib_put_ah(path->ah);
553
554 kfree(path);
555 }
556
557 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
558
559 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
560 {
561 struct ipoib_path_iter *iter;
562
563 iter = kmalloc(sizeof *iter, GFP_KERNEL);
564 if (!iter)
565 return NULL;
566
567 iter->dev = dev;
568 memset(iter->path.pathrec.dgid.raw, 0, 16);
569
570 if (ipoib_path_iter_next(iter)) {
571 kfree(iter);
572 return NULL;
573 }
574
575 return iter;
576 }
577
578 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
579 {
580 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
581 struct rb_node *n;
582 struct ipoib_path *path;
583 int ret = 1;
584
585 spin_lock_irq(&priv->lock);
586
587 n = rb_first(&priv->path_tree);
588
589 while (n) {
590 path = rb_entry(n, struct ipoib_path, rb_node);
591
592 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
593 sizeof (union ib_gid)) < 0) {
594 iter->path = *path;
595 ret = 0;
596 break;
597 }
598
599 n = rb_next(n);
600 }
601
602 spin_unlock_irq(&priv->lock);
603
604 return ret;
605 }
606
607 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
608 struct ipoib_path *path)
609 {
610 *path = iter->path;
611 }
612
613 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
614
615 void ipoib_mark_paths_invalid(struct net_device *dev)
616 {
617 struct ipoib_dev_priv *priv = netdev_priv(dev);
618 struct ipoib_path *path, *tp;
619
620 spin_lock_irq(&priv->lock);
621
622 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
623 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
624 be16_to_cpu(path->pathrec.dlid),
625 path->pathrec.dgid.raw);
626 path->valid = 0;
627 }
628
629 spin_unlock_irq(&priv->lock);
630 }
631
632 void ipoib_flush_paths(struct net_device *dev)
633 {
634 struct ipoib_dev_priv *priv = netdev_priv(dev);
635 struct ipoib_path *path, *tp;
636 LIST_HEAD(remove_list);
637 unsigned long flags;
638
639 netif_tx_lock_bh(dev);
640 spin_lock_irqsave(&priv->lock, flags);
641
642 list_splice_init(&priv->path_list, &remove_list);
643
644 list_for_each_entry(path, &remove_list, list)
645 rb_erase(&path->rb_node, &priv->path_tree);
646
647 list_for_each_entry_safe(path, tp, &remove_list, list) {
648 if (path->query)
649 ib_sa_cancel_query(path->query_id, path->query);
650 spin_unlock_irqrestore(&priv->lock, flags);
651 netif_tx_unlock_bh(dev);
652 wait_for_completion(&path->done);
653 path_free(dev, path);
654 netif_tx_lock_bh(dev);
655 spin_lock_irqsave(&priv->lock, flags);
656 }
657
658 spin_unlock_irqrestore(&priv->lock, flags);
659 netif_tx_unlock_bh(dev);
660 }
661
662 static void path_rec_completion(int status,
663 struct ib_sa_path_rec *pathrec,
664 void *path_ptr)
665 {
666 struct ipoib_path *path = path_ptr;
667 struct net_device *dev = path->dev;
668 struct ipoib_dev_priv *priv = netdev_priv(dev);
669 struct ipoib_ah *ah = NULL;
670 struct ipoib_ah *old_ah = NULL;
671 struct ipoib_neigh *neigh, *tn;
672 struct sk_buff_head skqueue;
673 struct sk_buff *skb;
674 unsigned long flags;
675
676 if (!status)
677 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
678 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
679 else
680 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
681 status, path->pathrec.dgid.raw);
682
683 skb_queue_head_init(&skqueue);
684
685 if (!status) {
686 struct ib_ah_attr av;
687
688 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
689 ah = ipoib_create_ah(dev, priv->pd, &av);
690 }
691
692 spin_lock_irqsave(&priv->lock, flags);
693
694 if (!IS_ERR_OR_NULL(ah)) {
695 path->pathrec = *pathrec;
696
697 old_ah = path->ah;
698 path->ah = ah;
699
700 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
701 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
702
703 while ((skb = __skb_dequeue(&path->queue)))
704 __skb_queue_tail(&skqueue, skb);
705
706 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
707 if (neigh->ah) {
708 WARN_ON(neigh->ah != old_ah);
709 /*
710 * Dropping the ah reference inside
711 * priv->lock is safe here, because we
712 * will hold one more reference from
713 * the original value of path->ah (ie
714 * old_ah).
715 */
716 ipoib_put_ah(neigh->ah);
717 }
718 kref_get(&path->ah->ref);
719 neigh->ah = path->ah;
720
721 if (ipoib_cm_enabled(dev, neigh->daddr)) {
722 if (!ipoib_cm_get(neigh))
723 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
724 path,
725 neigh));
726 if (!ipoib_cm_get(neigh)) {
727 ipoib_neigh_free(neigh);
728 continue;
729 }
730 }
731
732 while ((skb = __skb_dequeue(&neigh->queue)))
733 __skb_queue_tail(&skqueue, skb);
734 }
735 path->valid = 1;
736 }
737
738 path->query = NULL;
739 complete(&path->done);
740
741 spin_unlock_irqrestore(&priv->lock, flags);
742
743 if (IS_ERR_OR_NULL(ah))
744 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
745
746 if (old_ah)
747 ipoib_put_ah(old_ah);
748
749 while ((skb = __skb_dequeue(&skqueue))) {
750 skb->dev = dev;
751 if (dev_queue_xmit(skb))
752 ipoib_warn(priv, "dev_queue_xmit failed "
753 "to requeue packet\n");
754 }
755 }
756
757 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
758 {
759 struct ipoib_dev_priv *priv = netdev_priv(dev);
760 struct ipoib_path *path;
761
762 if (!priv->broadcast)
763 return NULL;
764
765 path = kzalloc(sizeof *path, GFP_ATOMIC);
766 if (!path)
767 return NULL;
768
769 path->dev = dev;
770
771 skb_queue_head_init(&path->queue);
772
773 INIT_LIST_HEAD(&path->neigh_list);
774
775 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
776 path->pathrec.sgid = priv->local_gid;
777 path->pathrec.pkey = cpu_to_be16(priv->pkey);
778 path->pathrec.numb_path = 1;
779 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
780
781 return path;
782 }
783
784 static int path_rec_start(struct net_device *dev,
785 struct ipoib_path *path)
786 {
787 struct ipoib_dev_priv *priv = netdev_priv(dev);
788
789 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
790 path->pathrec.dgid.raw);
791
792 init_completion(&path->done);
793
794 path->query_id =
795 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
796 &path->pathrec,
797 IB_SA_PATH_REC_DGID |
798 IB_SA_PATH_REC_SGID |
799 IB_SA_PATH_REC_NUMB_PATH |
800 IB_SA_PATH_REC_TRAFFIC_CLASS |
801 IB_SA_PATH_REC_PKEY,
802 1000, GFP_ATOMIC,
803 path_rec_completion,
804 path, &path->query);
805 if (path->query_id < 0) {
806 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
807 path->query = NULL;
808 complete(&path->done);
809 return path->query_id;
810 }
811
812 return 0;
813 }
814
815 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
816 struct net_device *dev)
817 {
818 struct ipoib_dev_priv *priv = netdev_priv(dev);
819 struct ipoib_path *path;
820 struct ipoib_neigh *neigh;
821 unsigned long flags;
822
823 spin_lock_irqsave(&priv->lock, flags);
824 neigh = ipoib_neigh_alloc(daddr, dev);
825 if (!neigh) {
826 spin_unlock_irqrestore(&priv->lock, flags);
827 ++dev->stats.tx_dropped;
828 dev_kfree_skb_any(skb);
829 return;
830 }
831
832 path = __path_find(dev, daddr + 4);
833 if (!path) {
834 path = path_rec_create(dev, daddr + 4);
835 if (!path)
836 goto err_path;
837
838 __path_add(dev, path);
839 }
840
841 list_add_tail(&neigh->list, &path->neigh_list);
842
843 if (path->ah) {
844 kref_get(&path->ah->ref);
845 neigh->ah = path->ah;
846
847 if (ipoib_cm_enabled(dev, neigh->daddr)) {
848 if (!ipoib_cm_get(neigh))
849 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
850 if (!ipoib_cm_get(neigh)) {
851 ipoib_neigh_free(neigh);
852 goto err_drop;
853 }
854 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
855 __skb_queue_tail(&neigh->queue, skb);
856 else {
857 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
858 skb_queue_len(&neigh->queue));
859 goto err_drop;
860 }
861 } else {
862 spin_unlock_irqrestore(&priv->lock, flags);
863 ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
864 ipoib_neigh_put(neigh);
865 return;
866 }
867 } else {
868 neigh->ah = NULL;
869
870 if (!path->query && path_rec_start(dev, path))
871 goto err_path;
872 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
873 __skb_queue_tail(&neigh->queue, skb);
874 else
875 goto err_drop;
876 }
877
878 spin_unlock_irqrestore(&priv->lock, flags);
879 ipoib_neigh_put(neigh);
880 return;
881
882 err_path:
883 ipoib_neigh_free(neigh);
884 err_drop:
885 ++dev->stats.tx_dropped;
886 dev_kfree_skb_any(skb);
887
888 spin_unlock_irqrestore(&priv->lock, flags);
889 ipoib_neigh_put(neigh);
890 }
891
892 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
893 struct ipoib_cb *cb)
894 {
895 struct ipoib_dev_priv *priv = netdev_priv(dev);
896 struct ipoib_path *path;
897 unsigned long flags;
898
899 spin_lock_irqsave(&priv->lock, flags);
900
901 path = __path_find(dev, cb->hwaddr + 4);
902 if (!path || !path->valid) {
903 int new_path = 0;
904
905 if (!path) {
906 path = path_rec_create(dev, cb->hwaddr + 4);
907 new_path = 1;
908 }
909 if (path) {
910 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
911 __skb_queue_tail(&path->queue, skb);
912 } else {
913 ++dev->stats.tx_dropped;
914 dev_kfree_skb_any(skb);
915 }
916
917 if (!path->query && path_rec_start(dev, path)) {
918 spin_unlock_irqrestore(&priv->lock, flags);
919 if (new_path)
920 path_free(dev, path);
921 return;
922 } else
923 __path_add(dev, path);
924 } else {
925 ++dev->stats.tx_dropped;
926 dev_kfree_skb_any(skb);
927 }
928
929 spin_unlock_irqrestore(&priv->lock, flags);
930 return;
931 }
932
933 if (path->ah) {
934 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
935 be16_to_cpu(path->pathrec.dlid));
936
937 spin_unlock_irqrestore(&priv->lock, flags);
938 ipoib_send(dev, skb, path->ah, IPOIB_QPN(cb->hwaddr));
939 return;
940 } else if ((path->query || !path_rec_start(dev, path)) &&
941 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
942 __skb_queue_tail(&path->queue, skb);
943 } else {
944 ++dev->stats.tx_dropped;
945 dev_kfree_skb_any(skb);
946 }
947
948 spin_unlock_irqrestore(&priv->lock, flags);
949 }
950
951 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
952 {
953 struct ipoib_dev_priv *priv = netdev_priv(dev);
954 struct ipoib_neigh *neigh;
955 struct ipoib_cb *cb = ipoib_skb_cb(skb);
956 struct ipoib_header *header;
957 unsigned long flags;
958
959 header = (struct ipoib_header *) skb->data;
960
961 if (unlikely(cb->hwaddr[4] == 0xff)) {
962 /* multicast, arrange "if" according to probability */
963 if ((header->proto != htons(ETH_P_IP)) &&
964 (header->proto != htons(ETH_P_IPV6)) &&
965 (header->proto != htons(ETH_P_ARP)) &&
966 (header->proto != htons(ETH_P_RARP)) &&
967 (header->proto != htons(ETH_P_TIPC))) {
968 /* ethertype not supported by IPoIB */
969 ++dev->stats.tx_dropped;
970 dev_kfree_skb_any(skb);
971 return NETDEV_TX_OK;
972 }
973 /* Add in the P_Key for multicast*/
974 cb->hwaddr[8] = (priv->pkey >> 8) & 0xff;
975 cb->hwaddr[9] = priv->pkey & 0xff;
976
977 neigh = ipoib_neigh_get(dev, cb->hwaddr);
978 if (likely(neigh))
979 goto send_using_neigh;
980 ipoib_mcast_send(dev, cb->hwaddr, skb);
981 return NETDEV_TX_OK;
982 }
983
984 /* unicast, arrange "switch" according to probability */
985 switch (header->proto) {
986 case htons(ETH_P_IP):
987 case htons(ETH_P_IPV6):
988 case htons(ETH_P_TIPC):
989 neigh = ipoib_neigh_get(dev, cb->hwaddr);
990 if (unlikely(!neigh)) {
991 neigh_add_path(skb, cb->hwaddr, dev);
992 return NETDEV_TX_OK;
993 }
994 break;
995 case htons(ETH_P_ARP):
996 case htons(ETH_P_RARP):
997 /* for unicast ARP and RARP should always perform path find */
998 unicast_arp_send(skb, dev, cb);
999 return NETDEV_TX_OK;
1000 default:
1001 /* ethertype not supported by IPoIB */
1002 ++dev->stats.tx_dropped;
1003 dev_kfree_skb_any(skb);
1004 return NETDEV_TX_OK;
1005 }
1006
1007 send_using_neigh:
1008 /* note we now hold a ref to neigh */
1009 if (ipoib_cm_get(neigh)) {
1010 if (ipoib_cm_up(neigh)) {
1011 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1012 goto unref;
1013 }
1014 } else if (neigh->ah) {
1015 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(cb->hwaddr));
1016 goto unref;
1017 }
1018
1019 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1020 spin_lock_irqsave(&priv->lock, flags);
1021 __skb_queue_tail(&neigh->queue, skb);
1022 spin_unlock_irqrestore(&priv->lock, flags);
1023 } else {
1024 ++dev->stats.tx_dropped;
1025 dev_kfree_skb_any(skb);
1026 }
1027
1028 unref:
1029 ipoib_neigh_put(neigh);
1030
1031 return NETDEV_TX_OK;
1032 }
1033
1034 static void ipoib_timeout(struct net_device *dev)
1035 {
1036 struct ipoib_dev_priv *priv = netdev_priv(dev);
1037
1038 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1039 jiffies_to_msecs(jiffies - dev->trans_start));
1040 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
1041 netif_queue_stopped(dev),
1042 priv->tx_head, priv->tx_tail);
1043 /* XXX reset QP, etc. */
1044 }
1045
1046 static int ipoib_hard_header(struct sk_buff *skb,
1047 struct net_device *dev,
1048 unsigned short type,
1049 const void *daddr, const void *saddr, unsigned len)
1050 {
1051 struct ipoib_header *header;
1052 struct ipoib_cb *cb = ipoib_skb_cb(skb);
1053
1054 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
1055
1056 header->proto = htons(type);
1057 header->reserved = 0;
1058
1059 /*
1060 * we don't rely on dst_entry structure, always stuff the
1061 * destination address into skb->cb so we can figure out where
1062 * to send the packet later.
1063 */
1064 memcpy(cb->hwaddr, daddr, INFINIBAND_ALEN);
1065
1066 return sizeof *header;
1067 }
1068
1069 static void ipoib_set_mcast_list(struct net_device *dev)
1070 {
1071 struct ipoib_dev_priv *priv = netdev_priv(dev);
1072
1073 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1074 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1075 return;
1076 }
1077
1078 queue_work(priv->wq, &priv->restart_task);
1079 }
1080
1081 static int ipoib_get_iflink(const struct net_device *dev)
1082 {
1083 struct ipoib_dev_priv *priv = netdev_priv(dev);
1084
1085 /* parent interface */
1086 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1087 return dev->ifindex;
1088
1089 /* child/vlan interface */
1090 return priv->parent->ifindex;
1091 }
1092
1093 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1094 {
1095 /*
1096 * Use only the address parts that contributes to spreading
1097 * The subnet prefix is not used as one can not connect to
1098 * same remote port (GUID) using the same remote QPN via two
1099 * different subnets.
1100 */
1101 /* qpn octets[1:4) & port GUID octets[12:20) */
1102 u32 *d32 = (u32 *) daddr;
1103 u32 hv;
1104
1105 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1106 return hv & htbl->mask;
1107 }
1108
1109 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1110 {
1111 struct ipoib_dev_priv *priv = netdev_priv(dev);
1112 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1113 struct ipoib_neigh_hash *htbl;
1114 struct ipoib_neigh *neigh = NULL;
1115 u32 hash_val;
1116
1117 rcu_read_lock_bh();
1118
1119 htbl = rcu_dereference_bh(ntbl->htbl);
1120
1121 if (!htbl)
1122 goto out_unlock;
1123
1124 hash_val = ipoib_addr_hash(htbl, daddr);
1125 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1126 neigh != NULL;
1127 neigh = rcu_dereference_bh(neigh->hnext)) {
1128 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1129 /* found, take one ref on behalf of the caller */
1130 if (!atomic_inc_not_zero(&neigh->refcnt)) {
1131 /* deleted */
1132 neigh = NULL;
1133 goto out_unlock;
1134 }
1135 neigh->alive = jiffies;
1136 goto out_unlock;
1137 }
1138 }
1139
1140 out_unlock:
1141 rcu_read_unlock_bh();
1142 return neigh;
1143 }
1144
1145 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1146 {
1147 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1148 struct ipoib_neigh_hash *htbl;
1149 unsigned long neigh_obsolete;
1150 unsigned long dt;
1151 unsigned long flags;
1152 int i;
1153 LIST_HEAD(remove_list);
1154
1155 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1156 return;
1157
1158 spin_lock_irqsave(&priv->lock, flags);
1159
1160 htbl = rcu_dereference_protected(ntbl->htbl,
1161 lockdep_is_held(&priv->lock));
1162
1163 if (!htbl)
1164 goto out_unlock;
1165
1166 /* neigh is obsolete if it was idle for two GC periods */
1167 dt = 2 * arp_tbl.gc_interval;
1168 neigh_obsolete = jiffies - dt;
1169 /* handle possible race condition */
1170 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1171 goto out_unlock;
1172
1173 for (i = 0; i < htbl->size; i++) {
1174 struct ipoib_neigh *neigh;
1175 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1176
1177 while ((neigh = rcu_dereference_protected(*np,
1178 lockdep_is_held(&priv->lock))) != NULL) {
1179 /* was the neigh idle for two GC periods */
1180 if (time_after(neigh_obsolete, neigh->alive)) {
1181
1182 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1183
1184 rcu_assign_pointer(*np,
1185 rcu_dereference_protected(neigh->hnext,
1186 lockdep_is_held(&priv->lock)));
1187 /* remove from path/mc list */
1188 list_del(&neigh->list);
1189 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1190 } else {
1191 np = &neigh->hnext;
1192 }
1193
1194 }
1195 }
1196
1197 out_unlock:
1198 spin_unlock_irqrestore(&priv->lock, flags);
1199 ipoib_mcast_remove_list(&remove_list);
1200 }
1201
1202 static void ipoib_reap_neigh(struct work_struct *work)
1203 {
1204 struct ipoib_dev_priv *priv =
1205 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1206
1207 __ipoib_reap_neigh(priv);
1208
1209 if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1210 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1211 arp_tbl.gc_interval);
1212 }
1213
1214
1215 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1216 struct net_device *dev)
1217 {
1218 struct ipoib_neigh *neigh;
1219
1220 neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
1221 if (!neigh)
1222 return NULL;
1223
1224 neigh->dev = dev;
1225 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1226 skb_queue_head_init(&neigh->queue);
1227 INIT_LIST_HEAD(&neigh->list);
1228 ipoib_cm_set(neigh, NULL);
1229 /* one ref on behalf of the caller */
1230 atomic_set(&neigh->refcnt, 1);
1231
1232 return neigh;
1233 }
1234
1235 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1236 struct net_device *dev)
1237 {
1238 struct ipoib_dev_priv *priv = netdev_priv(dev);
1239 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1240 struct ipoib_neigh_hash *htbl;
1241 struct ipoib_neigh *neigh;
1242 u32 hash_val;
1243
1244 htbl = rcu_dereference_protected(ntbl->htbl,
1245 lockdep_is_held(&priv->lock));
1246 if (!htbl) {
1247 neigh = NULL;
1248 goto out_unlock;
1249 }
1250
1251 /* need to add a new neigh, but maybe some other thread succeeded?
1252 * recalc hash, maybe hash resize took place so we do a search
1253 */
1254 hash_val = ipoib_addr_hash(htbl, daddr);
1255 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1256 lockdep_is_held(&priv->lock));
1257 neigh != NULL;
1258 neigh = rcu_dereference_protected(neigh->hnext,
1259 lockdep_is_held(&priv->lock))) {
1260 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1261 /* found, take one ref on behalf of the caller */
1262 if (!atomic_inc_not_zero(&neigh->refcnt)) {
1263 /* deleted */
1264 neigh = NULL;
1265 break;
1266 }
1267 neigh->alive = jiffies;
1268 goto out_unlock;
1269 }
1270 }
1271
1272 neigh = ipoib_neigh_ctor(daddr, dev);
1273 if (!neigh)
1274 goto out_unlock;
1275
1276 /* one ref on behalf of the hash table */
1277 atomic_inc(&neigh->refcnt);
1278 neigh->alive = jiffies;
1279 /* put in hash */
1280 rcu_assign_pointer(neigh->hnext,
1281 rcu_dereference_protected(htbl->buckets[hash_val],
1282 lockdep_is_held(&priv->lock)));
1283 rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1284 atomic_inc(&ntbl->entries);
1285
1286 out_unlock:
1287
1288 return neigh;
1289 }
1290
1291 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1292 {
1293 /* neigh reference count was dropprd to zero */
1294 struct net_device *dev = neigh->dev;
1295 struct ipoib_dev_priv *priv = netdev_priv(dev);
1296 struct sk_buff *skb;
1297 if (neigh->ah)
1298 ipoib_put_ah(neigh->ah);
1299 while ((skb = __skb_dequeue(&neigh->queue))) {
1300 ++dev->stats.tx_dropped;
1301 dev_kfree_skb_any(skb);
1302 }
1303 if (ipoib_cm_get(neigh))
1304 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1305 ipoib_dbg(netdev_priv(dev),
1306 "neigh free for %06x %pI6\n",
1307 IPOIB_QPN(neigh->daddr),
1308 neigh->daddr + 4);
1309 kfree(neigh);
1310 if (atomic_dec_and_test(&priv->ntbl.entries)) {
1311 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1312 complete(&priv->ntbl.flushed);
1313 }
1314 }
1315
1316 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1317 {
1318 /* Called as a result of removal from hash table */
1319 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1320 /* note TX context may hold another ref */
1321 ipoib_neigh_put(neigh);
1322 }
1323
1324 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1325 {
1326 struct net_device *dev = neigh->dev;
1327 struct ipoib_dev_priv *priv = netdev_priv(dev);
1328 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1329 struct ipoib_neigh_hash *htbl;
1330 struct ipoib_neigh __rcu **np;
1331 struct ipoib_neigh *n;
1332 u32 hash_val;
1333
1334 htbl = rcu_dereference_protected(ntbl->htbl,
1335 lockdep_is_held(&priv->lock));
1336 if (!htbl)
1337 return;
1338
1339 hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1340 np = &htbl->buckets[hash_val];
1341 for (n = rcu_dereference_protected(*np,
1342 lockdep_is_held(&priv->lock));
1343 n != NULL;
1344 n = rcu_dereference_protected(*np,
1345 lockdep_is_held(&priv->lock))) {
1346 if (n == neigh) {
1347 /* found */
1348 rcu_assign_pointer(*np,
1349 rcu_dereference_protected(neigh->hnext,
1350 lockdep_is_held(&priv->lock)));
1351 /* remove from parent list */
1352 list_del(&neigh->list);
1353 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1354 return;
1355 } else {
1356 np = &n->hnext;
1357 }
1358 }
1359 }
1360
1361 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1362 {
1363 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1364 struct ipoib_neigh_hash *htbl;
1365 struct ipoib_neigh __rcu **buckets;
1366 u32 size;
1367
1368 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1369 ntbl->htbl = NULL;
1370 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1371 if (!htbl)
1372 return -ENOMEM;
1373 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1374 size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1375 buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1376 if (!buckets) {
1377 kfree(htbl);
1378 return -ENOMEM;
1379 }
1380 htbl->size = size;
1381 htbl->mask = (size - 1);
1382 htbl->buckets = buckets;
1383 RCU_INIT_POINTER(ntbl->htbl, htbl);
1384 htbl->ntbl = ntbl;
1385 atomic_set(&ntbl->entries, 0);
1386
1387 /* start garbage collection */
1388 clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1389 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1390 arp_tbl.gc_interval);
1391
1392 return 0;
1393 }
1394
1395 static void neigh_hash_free_rcu(struct rcu_head *head)
1396 {
1397 struct ipoib_neigh_hash *htbl = container_of(head,
1398 struct ipoib_neigh_hash,
1399 rcu);
1400 struct ipoib_neigh __rcu **buckets = htbl->buckets;
1401 struct ipoib_neigh_table *ntbl = htbl->ntbl;
1402
1403 kfree(buckets);
1404 kfree(htbl);
1405 complete(&ntbl->deleted);
1406 }
1407
1408 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1409 {
1410 struct ipoib_dev_priv *priv = netdev_priv(dev);
1411 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1412 struct ipoib_neigh_hash *htbl;
1413 unsigned long flags;
1414 int i;
1415
1416 /* remove all neigh connected to a given path or mcast */
1417 spin_lock_irqsave(&priv->lock, flags);
1418
1419 htbl = rcu_dereference_protected(ntbl->htbl,
1420 lockdep_is_held(&priv->lock));
1421
1422 if (!htbl)
1423 goto out_unlock;
1424
1425 for (i = 0; i < htbl->size; i++) {
1426 struct ipoib_neigh *neigh;
1427 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1428
1429 while ((neigh = rcu_dereference_protected(*np,
1430 lockdep_is_held(&priv->lock))) != NULL) {
1431 /* delete neighs belong to this parent */
1432 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1433 rcu_assign_pointer(*np,
1434 rcu_dereference_protected(neigh->hnext,
1435 lockdep_is_held(&priv->lock)));
1436 /* remove from parent list */
1437 list_del(&neigh->list);
1438 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1439 } else {
1440 np = &neigh->hnext;
1441 }
1442
1443 }
1444 }
1445 out_unlock:
1446 spin_unlock_irqrestore(&priv->lock, flags);
1447 }
1448
1449 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1450 {
1451 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1452 struct ipoib_neigh_hash *htbl;
1453 unsigned long flags;
1454 int i, wait_flushed = 0;
1455
1456 init_completion(&priv->ntbl.flushed);
1457
1458 spin_lock_irqsave(&priv->lock, flags);
1459
1460 htbl = rcu_dereference_protected(ntbl->htbl,
1461 lockdep_is_held(&priv->lock));
1462 if (!htbl)
1463 goto out_unlock;
1464
1465 wait_flushed = atomic_read(&priv->ntbl.entries);
1466 if (!wait_flushed)
1467 goto free_htbl;
1468
1469 for (i = 0; i < htbl->size; i++) {
1470 struct ipoib_neigh *neigh;
1471 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1472
1473 while ((neigh = rcu_dereference_protected(*np,
1474 lockdep_is_held(&priv->lock))) != NULL) {
1475 rcu_assign_pointer(*np,
1476 rcu_dereference_protected(neigh->hnext,
1477 lockdep_is_held(&priv->lock)));
1478 /* remove from path/mc list */
1479 list_del(&neigh->list);
1480 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1481 }
1482 }
1483
1484 free_htbl:
1485 rcu_assign_pointer(ntbl->htbl, NULL);
1486 call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1487
1488 out_unlock:
1489 spin_unlock_irqrestore(&priv->lock, flags);
1490 if (wait_flushed)
1491 wait_for_completion(&priv->ntbl.flushed);
1492 }
1493
1494 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1495 {
1496 struct ipoib_dev_priv *priv = netdev_priv(dev);
1497 int stopped;
1498
1499 ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1500 init_completion(&priv->ntbl.deleted);
1501 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1502
1503 /* Stop GC if called at init fail need to cancel work */
1504 stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1505 if (!stopped)
1506 cancel_delayed_work(&priv->neigh_reap_task);
1507
1508 ipoib_flush_neighs(priv);
1509
1510 wait_for_completion(&priv->ntbl.deleted);
1511 }
1512
1513
1514 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1515 {
1516 struct ipoib_dev_priv *priv = netdev_priv(dev);
1517
1518 /* Allocate RX/TX "rings" to hold queued skbs */
1519 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1520 GFP_KERNEL);
1521 if (!priv->rx_ring) {
1522 printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
1523 ca->name, ipoib_recvq_size);
1524 goto out;
1525 }
1526
1527 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1528 if (!priv->tx_ring) {
1529 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1530 ca->name, ipoib_sendq_size);
1531 goto out_rx_ring_cleanup;
1532 }
1533
1534 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1535
1536 if (ipoib_ib_dev_init(dev, ca, port))
1537 goto out_tx_ring_cleanup;
1538
1539 /*
1540 * Must be after ipoib_ib_dev_init so we can allocate a per
1541 * device wq there and use it here
1542 */
1543 if (ipoib_neigh_hash_init(priv) < 0)
1544 goto out_dev_uninit;
1545
1546 return 0;
1547
1548 out_dev_uninit:
1549 ipoib_ib_dev_cleanup(dev);
1550
1551 out_tx_ring_cleanup:
1552 vfree(priv->tx_ring);
1553
1554 out_rx_ring_cleanup:
1555 kfree(priv->rx_ring);
1556
1557 out:
1558 return -ENOMEM;
1559 }
1560
1561 void ipoib_dev_cleanup(struct net_device *dev)
1562 {
1563 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1564 LIST_HEAD(head);
1565
1566 ASSERT_RTNL();
1567
1568 ipoib_delete_debug_files(dev);
1569
1570 /* Delete any child interfaces first */
1571 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1572 /* Stop GC on child */
1573 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1574 cancel_delayed_work(&cpriv->neigh_reap_task);
1575 unregister_netdevice_queue(cpriv->dev, &head);
1576 }
1577 unregister_netdevice_many(&head);
1578
1579 /*
1580 * Must be before ipoib_ib_dev_cleanup or we delete an in use
1581 * work queue
1582 */
1583 ipoib_neigh_hash_uninit(dev);
1584
1585 ipoib_ib_dev_cleanup(dev);
1586
1587 kfree(priv->rx_ring);
1588 vfree(priv->tx_ring);
1589
1590 priv->rx_ring = NULL;
1591 priv->tx_ring = NULL;
1592 }
1593
1594 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
1595 {
1596 struct ipoib_dev_priv *priv = netdev_priv(dev);
1597
1598 return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
1599 }
1600
1601 static int ipoib_get_vf_config(struct net_device *dev, int vf,
1602 struct ifla_vf_info *ivf)
1603 {
1604 struct ipoib_dev_priv *priv = netdev_priv(dev);
1605 int err;
1606
1607 err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
1608 if (err)
1609 return err;
1610
1611 ivf->vf = vf;
1612
1613 return 0;
1614 }
1615
1616 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
1617 {
1618 struct ipoib_dev_priv *priv = netdev_priv(dev);
1619
1620 if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
1621 return -EINVAL;
1622
1623 return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
1624 }
1625
1626 static int ipoib_get_vf_stats(struct net_device *dev, int vf,
1627 struct ifla_vf_stats *vf_stats)
1628 {
1629 struct ipoib_dev_priv *priv = netdev_priv(dev);
1630
1631 return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
1632 }
1633
1634 static const struct header_ops ipoib_header_ops = {
1635 .create = ipoib_hard_header,
1636 };
1637
1638 static const struct net_device_ops ipoib_netdev_ops_pf = {
1639 .ndo_uninit = ipoib_uninit,
1640 .ndo_open = ipoib_open,
1641 .ndo_stop = ipoib_stop,
1642 .ndo_change_mtu = ipoib_change_mtu,
1643 .ndo_fix_features = ipoib_fix_features,
1644 .ndo_start_xmit = ipoib_start_xmit,
1645 .ndo_tx_timeout = ipoib_timeout,
1646 .ndo_set_rx_mode = ipoib_set_mcast_list,
1647 .ndo_get_iflink = ipoib_get_iflink,
1648 .ndo_set_vf_link_state = ipoib_set_vf_link_state,
1649 .ndo_get_vf_config = ipoib_get_vf_config,
1650 .ndo_get_vf_stats = ipoib_get_vf_stats,
1651 .ndo_set_vf_guid = ipoib_set_vf_guid,
1652 };
1653
1654 static const struct net_device_ops ipoib_netdev_ops_vf = {
1655 .ndo_uninit = ipoib_uninit,
1656 .ndo_open = ipoib_open,
1657 .ndo_stop = ipoib_stop,
1658 .ndo_change_mtu = ipoib_change_mtu,
1659 .ndo_fix_features = ipoib_fix_features,
1660 .ndo_start_xmit = ipoib_start_xmit,
1661 .ndo_tx_timeout = ipoib_timeout,
1662 .ndo_set_rx_mode = ipoib_set_mcast_list,
1663 .ndo_get_iflink = ipoib_get_iflink,
1664 };
1665
1666 void ipoib_setup(struct net_device *dev)
1667 {
1668 struct ipoib_dev_priv *priv = netdev_priv(dev);
1669
1670 if (priv->hca_caps & IB_DEVICE_VIRTUAL_FUNCTION)
1671 dev->netdev_ops = &ipoib_netdev_ops_vf;
1672 else
1673 dev->netdev_ops = &ipoib_netdev_ops_pf;
1674
1675 dev->header_ops = &ipoib_header_ops;
1676
1677 ipoib_set_ethtool_ops(dev);
1678
1679 netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT);
1680
1681 dev->watchdog_timeo = HZ;
1682
1683 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
1684
1685 dev->hard_header_len = IPOIB_ENCAP_LEN;
1686 dev->addr_len = INFINIBAND_ALEN;
1687 dev->type = ARPHRD_INFINIBAND;
1688 dev->tx_queue_len = ipoib_sendq_size * 2;
1689 dev->features = (NETIF_F_VLAN_CHALLENGED |
1690 NETIF_F_HIGHDMA);
1691 netif_keep_dst(dev);
1692
1693 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1694
1695 priv->dev = dev;
1696
1697 spin_lock_init(&priv->lock);
1698
1699 init_rwsem(&priv->vlan_rwsem);
1700
1701 INIT_LIST_HEAD(&priv->path_list);
1702 INIT_LIST_HEAD(&priv->child_intfs);
1703 INIT_LIST_HEAD(&priv->dead_ahs);
1704 INIT_LIST_HEAD(&priv->multicast_list);
1705
1706 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1707 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1708 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
1709 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
1710 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
1711 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1712 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1713 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1714 }
1715
1716 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1717 {
1718 struct net_device *dev;
1719
1720 dev = alloc_netdev((int)sizeof(struct ipoib_dev_priv), name,
1721 NET_NAME_UNKNOWN, ipoib_setup);
1722 if (!dev)
1723 return NULL;
1724
1725 return netdev_priv(dev);
1726 }
1727
1728 static ssize_t show_pkey(struct device *dev,
1729 struct device_attribute *attr, char *buf)
1730 {
1731 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1732
1733 return sprintf(buf, "0x%04x\n", priv->pkey);
1734 }
1735 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1736
1737 static ssize_t show_umcast(struct device *dev,
1738 struct device_attribute *attr, char *buf)
1739 {
1740 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1741
1742 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1743 }
1744
1745 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
1746 {
1747 struct ipoib_dev_priv *priv = netdev_priv(ndev);
1748
1749 if (umcast_val > 0) {
1750 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1751 ipoib_warn(priv, "ignoring multicast groups joined directly "
1752 "by userspace\n");
1753 } else
1754 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1755 }
1756
1757 static ssize_t set_umcast(struct device *dev,
1758 struct device_attribute *attr,
1759 const char *buf, size_t count)
1760 {
1761 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1762
1763 ipoib_set_umcast(to_net_dev(dev), umcast_val);
1764
1765 return count;
1766 }
1767 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1768
1769 int ipoib_add_umcast_attr(struct net_device *dev)
1770 {
1771 return device_create_file(&dev->dev, &dev_attr_umcast);
1772 }
1773
1774 static ssize_t create_child(struct device *dev,
1775 struct device_attribute *attr,
1776 const char *buf, size_t count)
1777 {
1778 int pkey;
1779 int ret;
1780
1781 if (sscanf(buf, "%i", &pkey) != 1)
1782 return -EINVAL;
1783
1784 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
1785 return -EINVAL;
1786
1787 /*
1788 * Set the full membership bit, so that we join the right
1789 * broadcast group, etc.
1790 */
1791 pkey |= 0x8000;
1792
1793 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1794
1795 return ret ? ret : count;
1796 }
1797 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1798
1799 static ssize_t delete_child(struct device *dev,
1800 struct device_attribute *attr,
1801 const char *buf, size_t count)
1802 {
1803 int pkey;
1804 int ret;
1805
1806 if (sscanf(buf, "%i", &pkey) != 1)
1807 return -EINVAL;
1808
1809 if (pkey < 0 || pkey > 0xffff)
1810 return -EINVAL;
1811
1812 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1813
1814 return ret ? ret : count;
1815
1816 }
1817 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1818
1819 int ipoib_add_pkey_attr(struct net_device *dev)
1820 {
1821 return device_create_file(&dev->dev, &dev_attr_pkey);
1822 }
1823
1824 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1825 {
1826 priv->hca_caps = hca->attrs.device_cap_flags;
1827
1828 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1829 priv->dev->hw_features = NETIF_F_SG |
1830 NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1831
1832 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1833 priv->dev->hw_features |= NETIF_F_TSO;
1834
1835 priv->dev->features |= priv->dev->hw_features;
1836 }
1837
1838 return 0;
1839 }
1840
1841 static struct net_device *ipoib_add_port(const char *format,
1842 struct ib_device *hca, u8 port)
1843 {
1844 struct ipoib_dev_priv *priv;
1845 struct ib_port_attr attr;
1846 int result = -ENOMEM;
1847
1848 priv = ipoib_intf_alloc(format);
1849 if (!priv)
1850 goto alloc_mem_failed;
1851
1852 SET_NETDEV_DEV(priv->dev, hca->dma_device);
1853 priv->dev->dev_id = port - 1;
1854
1855 result = ib_query_port(hca, port, &attr);
1856 if (!result)
1857 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1858 else {
1859 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
1860 hca->name, port);
1861 goto device_init_failed;
1862 }
1863
1864 /* MTU will be reset when mcast join happens */
1865 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1866 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
1867
1868 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
1869
1870 result = ib_query_pkey(hca, port, 0, &priv->pkey);
1871 if (result) {
1872 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
1873 hca->name, port, result);
1874 goto device_init_failed;
1875 }
1876
1877 result = ipoib_set_dev_features(priv, hca);
1878 if (result)
1879 goto device_init_failed;
1880
1881 /*
1882 * Set the full membership bit, so that we join the right
1883 * broadcast group, etc.
1884 */
1885 priv->pkey |= 0x8000;
1886
1887 priv->dev->broadcast[8] = priv->pkey >> 8;
1888 priv->dev->broadcast[9] = priv->pkey & 0xff;
1889
1890 result = ib_query_gid(hca, port, 0, &priv->local_gid, NULL);
1891 if (result) {
1892 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
1893 hca->name, port, result);
1894 goto device_init_failed;
1895 } else
1896 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
1897
1898 result = ipoib_dev_init(priv->dev, hca, port);
1899 if (result < 0) {
1900 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
1901 hca->name, port, result);
1902 goto device_init_failed;
1903 }
1904
1905 INIT_IB_EVENT_HANDLER(&priv->event_handler,
1906 priv->ca, ipoib_event);
1907 result = ib_register_event_handler(&priv->event_handler);
1908 if (result < 0) {
1909 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
1910 "port %d (ret = %d)\n",
1911 hca->name, port, result);
1912 goto event_failed;
1913 }
1914
1915 result = register_netdev(priv->dev);
1916 if (result) {
1917 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
1918 hca->name, port, result);
1919 goto register_failed;
1920 }
1921
1922 ipoib_create_debug_files(priv->dev);
1923
1924 if (ipoib_cm_add_mode_attr(priv->dev))
1925 goto sysfs_failed;
1926 if (ipoib_add_pkey_attr(priv->dev))
1927 goto sysfs_failed;
1928 if (ipoib_add_umcast_attr(priv->dev))
1929 goto sysfs_failed;
1930 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
1931 goto sysfs_failed;
1932 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
1933 goto sysfs_failed;
1934
1935 return priv->dev;
1936
1937 sysfs_failed:
1938 ipoib_delete_debug_files(priv->dev);
1939 unregister_netdev(priv->dev);
1940
1941 register_failed:
1942 ib_unregister_event_handler(&priv->event_handler);
1943 flush_workqueue(ipoib_workqueue);
1944 /* Stop GC if started before flush */
1945 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1946 cancel_delayed_work(&priv->neigh_reap_task);
1947 flush_workqueue(priv->wq);
1948
1949 event_failed:
1950 ipoib_dev_cleanup(priv->dev);
1951
1952 device_init_failed:
1953 free_netdev(priv->dev);
1954
1955 alloc_mem_failed:
1956 return ERR_PTR(result);
1957 }
1958
1959 static void ipoib_add_one(struct ib_device *device)
1960 {
1961 struct list_head *dev_list;
1962 struct net_device *dev;
1963 struct ipoib_dev_priv *priv;
1964 int p;
1965 int count = 0;
1966
1967 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
1968 if (!dev_list)
1969 return;
1970
1971 INIT_LIST_HEAD(dev_list);
1972
1973 for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
1974 if (!rdma_protocol_ib(device, p))
1975 continue;
1976 dev = ipoib_add_port("ib%d", device, p);
1977 if (!IS_ERR(dev)) {
1978 priv = netdev_priv(dev);
1979 list_add_tail(&priv->list, dev_list);
1980 count++;
1981 }
1982 }
1983
1984 if (!count) {
1985 kfree(dev_list);
1986 return;
1987 }
1988
1989 ib_set_client_data(device, &ipoib_client, dev_list);
1990 }
1991
1992 static void ipoib_remove_one(struct ib_device *device, void *client_data)
1993 {
1994 struct ipoib_dev_priv *priv, *tmp;
1995 struct list_head *dev_list = client_data;
1996
1997 if (!dev_list)
1998 return;
1999
2000 list_for_each_entry_safe(priv, tmp, dev_list, list) {
2001 ib_unregister_event_handler(&priv->event_handler);
2002 flush_workqueue(ipoib_workqueue);
2003
2004 rtnl_lock();
2005 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
2006 rtnl_unlock();
2007
2008 /* Stop GC */
2009 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
2010 cancel_delayed_work(&priv->neigh_reap_task);
2011 flush_workqueue(priv->wq);
2012
2013 unregister_netdev(priv->dev);
2014 free_netdev(priv->dev);
2015 }
2016
2017 kfree(dev_list);
2018 }
2019
2020 static int __init ipoib_init_module(void)
2021 {
2022 int ret;
2023
2024 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2025 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2026 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2027
2028 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2029 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2030 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2031 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2032 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2033 #endif
2034
2035 /*
2036 * When copying small received packets, we only copy from the
2037 * linear data part of the SKB, so we rely on this condition.
2038 */
2039 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2040
2041 ret = ipoib_register_debugfs();
2042 if (ret)
2043 return ret;
2044
2045 /*
2046 * We create a global workqueue here that is used for all flush
2047 * operations. However, if you attempt to flush a workqueue
2048 * from a task on that same workqueue, it deadlocks the system.
2049 * We want to be able to flush the tasks associated with a
2050 * specific net device, so we also create a workqueue for each
2051 * netdevice. We queue up the tasks for that device only on
2052 * its private workqueue, and we only queue up flush events
2053 * on our global flush workqueue. This avoids the deadlocks.
2054 */
2055 ipoib_workqueue = create_singlethread_workqueue("ipoib_flush");
2056 if (!ipoib_workqueue) {
2057 ret = -ENOMEM;
2058 goto err_fs;
2059 }
2060
2061 ib_sa_register_client(&ipoib_sa_client);
2062
2063 ret = ib_register_client(&ipoib_client);
2064 if (ret)
2065 goto err_sa;
2066
2067 ret = ipoib_netlink_init();
2068 if (ret)
2069 goto err_client;
2070
2071 return 0;
2072
2073 err_client:
2074 ib_unregister_client(&ipoib_client);
2075
2076 err_sa:
2077 ib_sa_unregister_client(&ipoib_sa_client);
2078 destroy_workqueue(ipoib_workqueue);
2079
2080 err_fs:
2081 ipoib_unregister_debugfs();
2082
2083 return ret;
2084 }
2085
2086 static void __exit ipoib_cleanup_module(void)
2087 {
2088 ipoib_netlink_fini();
2089 ib_unregister_client(&ipoib_client);
2090 ib_sa_unregister_client(&ipoib_sa_client);
2091 ipoib_unregister_debugfs();
2092 destroy_workqueue(ipoib_workqueue);
2093 }
2094
2095 module_init(ipoib_init_module);
2096 module_exit(ipoib_cleanup_module);
Linux with added FPC-III support