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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
bloba6f41349132168140d97ef011f8550feacec571d
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 MODULE_AUTHOR("Roland Dreier");
56 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
57 MODULE_LICENSE("Dual BSD/GPL");
58
59 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
60 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
61
62 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
63 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
64 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
65 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
66
67 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
68 int ipoib_debug_level;
69
70 module_param_named(debug_level, ipoib_debug_level, int, 0644);
71 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
72 #endif
73
74 struct ipoib_path_iter {
75 struct net_device *dev;
76 struct ipoib_path path;
77 };
78
79 static const u8 ipv4_bcast_addr[] = {
80 0x00, 0xff, 0xff, 0xff,
81 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
82 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
83 };
84
85 struct workqueue_struct *ipoib_workqueue;
86
87 struct ib_sa_client ipoib_sa_client;
88
89 static int ipoib_add_one(struct ib_device *device);
90 static void ipoib_remove_one(struct ib_device *device, void *client_data);
91 static void ipoib_neigh_reclaim(struct rcu_head *rp);
92 static struct net_device *ipoib_get_net_dev_by_params(
93 struct ib_device *dev, u8 port, u16 pkey,
94 const union ib_gid *gid, const struct sockaddr *addr,
95 void *client_data);
96 static int ipoib_set_mac(struct net_device *dev, void *addr);
97 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
98 int cmd);
99
100 static struct ib_client ipoib_client = {
101 .name = "ipoib",
102 .add = ipoib_add_one,
103 .remove = ipoib_remove_one,
104 .get_net_dev_by_params = ipoib_get_net_dev_by_params,
105 };
106
107 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
108 static int ipoib_netdev_event(struct notifier_block *this,
109 unsigned long event, void *ptr)
110 {
111 struct netdev_notifier_info *ni = ptr;
112 struct net_device *dev = ni->dev;
113
114 if (dev->netdev_ops->ndo_open != ipoib_open)
115 return NOTIFY_DONE;
116
117 switch (event) {
118 case NETDEV_REGISTER:
119 ipoib_create_debug_files(dev);
120 break;
121 case NETDEV_CHANGENAME:
122 ipoib_delete_debug_files(dev);
123 ipoib_create_debug_files(dev);
124 break;
125 case NETDEV_UNREGISTER:
126 ipoib_delete_debug_files(dev);
127 break;
128 }
129
130 return NOTIFY_DONE;
131 }
132 #endif
133
134 int ipoib_open(struct net_device *dev)
135 {
136 struct ipoib_dev_priv *priv = ipoib_priv(dev);
137
138 ipoib_dbg(priv, "bringing up interface\n");
139
140 netif_carrier_off(dev);
141
142 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
143
144 priv->sm_fullmember_sendonly_support = false;
145
146 if (ipoib_ib_dev_open(dev)) {
147 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
148 return 0;
149 goto err_disable;
150 }
151
152 ipoib_ib_dev_up(dev);
153
154 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
155 struct ipoib_dev_priv *cpriv;
156
157 /* Bring up any child interfaces too */
158 down_read(&priv->vlan_rwsem);
159 list_for_each_entry(cpriv, &priv->child_intfs, list) {
160 int flags;
161
162 flags = cpriv->dev->flags;
163 if (flags & IFF_UP)
164 continue;
165
166 dev_change_flags(cpriv->dev, flags | IFF_UP, NULL);
167 }
168 up_read(&priv->vlan_rwsem);
169 }
170
171 netif_start_queue(dev);
172
173 return 0;
174
175 err_disable:
176 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
177
178 return -EINVAL;
179 }
180
181 static int ipoib_stop(struct net_device *dev)
182 {
183 struct ipoib_dev_priv *priv = ipoib_priv(dev);
184
185 ipoib_dbg(priv, "stopping interface\n");
186
187 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
188
189 netif_stop_queue(dev);
190
191 ipoib_ib_dev_down(dev);
192 ipoib_ib_dev_stop(dev);
193
194 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
195 struct ipoib_dev_priv *cpriv;
196
197 /* Bring down any child interfaces too */
198 down_read(&priv->vlan_rwsem);
199 list_for_each_entry(cpriv, &priv->child_intfs, list) {
200 int flags;
201
202 flags = cpriv->dev->flags;
203 if (!(flags & IFF_UP))
204 continue;
205
206 dev_change_flags(cpriv->dev, flags & ~IFF_UP, NULL);
207 }
208 up_read(&priv->vlan_rwsem);
209 }
210
211 return 0;
212 }
213
214 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
215 {
216 struct ipoib_dev_priv *priv = ipoib_priv(dev);
217
218 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
219 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
220
221 return features;
222 }
223
224 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
225 {
226 struct ipoib_dev_priv *priv = ipoib_priv(dev);
227 int ret = 0;
228
229 /* dev->mtu > 2K ==> connected mode */
230 if (ipoib_cm_admin_enabled(dev)) {
231 if (new_mtu > ipoib_cm_max_mtu(dev))
232 return -EINVAL;
233
234 if (new_mtu > priv->mcast_mtu)
235 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
236 priv->mcast_mtu);
237
238 dev->mtu = new_mtu;
239 return 0;
240 }
241
242 if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) ||
243 new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
244 return -EINVAL;
245
246 priv->admin_mtu = new_mtu;
247
248 if (priv->mcast_mtu < priv->admin_mtu)
249 ipoib_dbg(priv, "MTU must be smaller than the underlying "
250 "link layer MTU - 4 (%u)\n", priv->mcast_mtu);
251
252 new_mtu = min(priv->mcast_mtu, priv->admin_mtu);
253
254 if (priv->rn_ops->ndo_change_mtu) {
255 bool carrier_status = netif_carrier_ok(dev);
256
257 netif_carrier_off(dev);
258
259 /* notify lower level on the real mtu */
260 ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu);
261
262 if (carrier_status)
263 netif_carrier_on(dev);
264 } else {
265 dev->mtu = new_mtu;
266 }
267
268 return ret;
269 }
270
271 static void ipoib_get_stats(struct net_device *dev,
272 struct rtnl_link_stats64 *stats)
273 {
274 struct ipoib_dev_priv *priv = ipoib_priv(dev);
275
276 if (priv->rn_ops->ndo_get_stats64)
277 priv->rn_ops->ndo_get_stats64(dev, stats);
278 else
279 netdev_stats_to_stats64(stats, &dev->stats);
280 }
281
282 /* Called with an RCU read lock taken */
283 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
284 struct net_device *dev)
285 {
286 struct net *net = dev_net(dev);
287 struct in_device *in_dev;
288 struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
289 struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
290 __be32 ret_addr;
291
292 switch (addr->sa_family) {
293 case AF_INET:
294 in_dev = in_dev_get(dev);
295 if (!in_dev)
296 return false;
297
298 ret_addr = inet_confirm_addr(net, in_dev, 0,
299 addr_in->sin_addr.s_addr,
300 RT_SCOPE_HOST);
301 in_dev_put(in_dev);
302 if (ret_addr)
303 return true;
304
305 break;
306 case AF_INET6:
307 if (IS_ENABLED(CONFIG_IPV6) &&
308 ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
309 return true;
310
311 break;
312 }
313 return false;
314 }
315
316 /**
317 * Find the master net_device on top of the given net_device.
318 * @dev: base IPoIB net_device
319 *
320 * Returns the master net_device with a reference held, or the same net_device
321 * if no master exists.
322 */
323 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
324 {
325 struct net_device *master;
326
327 rcu_read_lock();
328 master = netdev_master_upper_dev_get_rcu(dev);
329 if (master)
330 dev_hold(master);
331 rcu_read_unlock();
332
333 if (master)
334 return master;
335
336 dev_hold(dev);
337 return dev;
338 }
339
340 struct ipoib_walk_data {
341 const struct sockaddr *addr;
342 struct net_device *result;
343 };
344
345 static int ipoib_upper_walk(struct net_device *upper,
346 struct netdev_nested_priv *priv)
347 {
348 struct ipoib_walk_data *data = (struct ipoib_walk_data *)priv->data;
349 int ret = 0;
350
351 if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) {
352 dev_hold(upper);
353 data->result = upper;
354 ret = 1;
355 }
356
357 return ret;
358 }
359
360 /**
361 * Find a net_device matching the given address, which is an upper device of
362 * the given net_device.
363 * @addr: IP address to look for.
364 * @dev: base IPoIB net_device
365 *
366 * If found, returns the net_device with a reference held. Otherwise return
367 * NULL.
368 */
369 static struct net_device *ipoib_get_net_dev_match_addr(
370 const struct sockaddr *addr, struct net_device *dev)
371 {
372 struct netdev_nested_priv priv;
373 struct ipoib_walk_data data = {
374 .addr = addr,
375 };
376
377 priv.data = (void *)&data;
378 rcu_read_lock();
379 if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
380 dev_hold(dev);
381 data.result = dev;
382 goto out;
383 }
384
385 netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &priv);
386 out:
387 rcu_read_unlock();
388 return data.result;
389 }
390
391 /* returns the number of IPoIB netdevs on top a given ipoib device matching a
392 * pkey_index and address, if one exists.
393 *
394 * @found_net_dev: contains a matching net_device if the return value >= 1,
395 * with a reference held. */
396 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
397 const union ib_gid *gid,
398 u16 pkey_index,
399 const struct sockaddr *addr,
400 int nesting,
401 struct net_device **found_net_dev)
402 {
403 struct ipoib_dev_priv *child_priv;
404 struct net_device *net_dev = NULL;
405 int matches = 0;
406
407 if (priv->pkey_index == pkey_index &&
408 (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
409 if (!addr) {
410 net_dev = ipoib_get_master_net_dev(priv->dev);
411 } else {
412 /* Verify the net_device matches the IP address, as
413 * IPoIB child devices currently share a GID. */
414 net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
415 }
416 if (net_dev) {
417 if (!*found_net_dev)
418 *found_net_dev = net_dev;
419 else
420 dev_put(net_dev);
421 ++matches;
422 }
423 }
424
425 /* Check child interfaces */
426 down_read_nested(&priv->vlan_rwsem, nesting);
427 list_for_each_entry(child_priv, &priv->child_intfs, list) {
428 matches += ipoib_match_gid_pkey_addr(child_priv, gid,
429 pkey_index, addr,
430 nesting + 1,
431 found_net_dev);
432 if (matches > 1)
433 break;
434 }
435 up_read(&priv->vlan_rwsem);
436
437 return matches;
438 }
439
440 /* Returns the number of matching net_devs found (between 0 and 2). Also
441 * return the matching net_device in the @net_dev parameter, holding a
442 * reference to the net_device, if the number of matches >= 1 */
443 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
444 u16 pkey_index,
445 const union ib_gid *gid,
446 const struct sockaddr *addr,
447 struct net_device **net_dev)
448 {
449 struct ipoib_dev_priv *priv;
450 int matches = 0;
451
452 *net_dev = NULL;
453
454 list_for_each_entry(priv, dev_list, list) {
455 if (priv->port != port)
456 continue;
457
458 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
459 addr, 0, net_dev);
460 if (matches > 1)
461 break;
462 }
463
464 return matches;
465 }
466
467 static struct net_device *ipoib_get_net_dev_by_params(
468 struct ib_device *dev, u8 port, u16 pkey,
469 const union ib_gid *gid, const struct sockaddr *addr,
470 void *client_data)
471 {
472 struct net_device *net_dev;
473 struct list_head *dev_list = client_data;
474 u16 pkey_index;
475 int matches;
476 int ret;
477
478 if (!rdma_protocol_ib(dev, port))
479 return NULL;
480
481 ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
482 if (ret)
483 return NULL;
484
485 /* See if we can find a unique device matching the L2 parameters */
486 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
487 gid, NULL, &net_dev);
488
489 switch (matches) {
490 case 0:
491 return NULL;
492 case 1:
493 return net_dev;
494 }
495
496 dev_put(net_dev);
497
498 /* Couldn't find a unique device with L2 parameters only. Use L3
499 * address to uniquely match the net device */
500 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
501 gid, addr, &net_dev);
502 switch (matches) {
503 case 0:
504 return NULL;
505 default:
506 dev_warn_ratelimited(&dev->dev,
507 "duplicate IP address detected\n");
508 fallthrough;
509 case 1:
510 return net_dev;
511 }
512 }
513
514 int ipoib_set_mode(struct net_device *dev, const char *buf)
515 {
516 struct ipoib_dev_priv *priv = ipoib_priv(dev);
517
518 if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
519 !strcmp(buf, "connected\n")) ||
520 (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
521 !strcmp(buf, "datagram\n"))) {
522 return 0;
523 }
524
525 /* flush paths if we switch modes so that connections are restarted */
526 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
527 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
528 ipoib_warn(priv, "enabling connected mode "
529 "will cause multicast packet drops\n");
530 netdev_update_features(dev);
531 dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
532 netif_set_real_num_tx_queues(dev, 1);
533 rtnl_unlock();
534 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
535
536 ipoib_flush_paths(dev);
537 return (!rtnl_trylock()) ? -EBUSY : 0;
538 }
539
540 if (!strcmp(buf, "datagram\n")) {
541 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
542 netdev_update_features(dev);
543 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
544 netif_set_real_num_tx_queues(dev, dev->num_tx_queues);
545 rtnl_unlock();
546 ipoib_flush_paths(dev);
547 return (!rtnl_trylock()) ? -EBUSY : 0;
548 }
549
550 return -EINVAL;
551 }
552
553 struct ipoib_path *__path_find(struct net_device *dev, void *gid)
554 {
555 struct ipoib_dev_priv *priv = ipoib_priv(dev);
556 struct rb_node *n = priv->path_tree.rb_node;
557 struct ipoib_path *path;
558 int ret;
559
560 while (n) {
561 path = rb_entry(n, struct ipoib_path, rb_node);
562
563 ret = memcmp(gid, path->pathrec.dgid.raw,
564 sizeof (union ib_gid));
565
566 if (ret < 0)
567 n = n->rb_left;
568 else if (ret > 0)
569 n = n->rb_right;
570 else
571 return path;
572 }
573
574 return NULL;
575 }
576
577 static int __path_add(struct net_device *dev, struct ipoib_path *path)
578 {
579 struct ipoib_dev_priv *priv = ipoib_priv(dev);
580 struct rb_node **n = &priv->path_tree.rb_node;
581 struct rb_node *pn = NULL;
582 struct ipoib_path *tpath;
583 int ret;
584
585 while (*n) {
586 pn = *n;
587 tpath = rb_entry(pn, struct ipoib_path, rb_node);
588
589 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
590 sizeof (union ib_gid));
591 if (ret < 0)
592 n = &pn->rb_left;
593 else if (ret > 0)
594 n = &pn->rb_right;
595 else
596 return -EEXIST;
597 }
598
599 rb_link_node(&path->rb_node, pn, n);
600 rb_insert_color(&path->rb_node, &priv->path_tree);
601
602 list_add_tail(&path->list, &priv->path_list);
603
604 return 0;
605 }
606
607 static void path_free(struct net_device *dev, struct ipoib_path *path)
608 {
609 struct sk_buff *skb;
610
611 while ((skb = __skb_dequeue(&path->queue)))
612 dev_kfree_skb_irq(skb);
613
614 ipoib_dbg(ipoib_priv(dev), "%s\n", __func__);
615
616 /* remove all neigh connected to this path */
617 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
618
619 if (path->ah)
620 ipoib_put_ah(path->ah);
621
622 kfree(path);
623 }
624
625 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
626
627 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
628 {
629 struct ipoib_path_iter *iter;
630
631 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
632 if (!iter)
633 return NULL;
634
635 iter->dev = dev;
636 memset(iter->path.pathrec.dgid.raw, 0, 16);
637
638 if (ipoib_path_iter_next(iter)) {
639 kfree(iter);
640 return NULL;
641 }
642
643 return iter;
644 }
645
646 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
647 {
648 struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
649 struct rb_node *n;
650 struct ipoib_path *path;
651 int ret = 1;
652
653 spin_lock_irq(&priv->lock);
654
655 n = rb_first(&priv->path_tree);
656
657 while (n) {
658 path = rb_entry(n, struct ipoib_path, rb_node);
659
660 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
661 sizeof (union ib_gid)) < 0) {
662 iter->path = *path;
663 ret = 0;
664 break;
665 }
666
667 n = rb_next(n);
668 }
669
670 spin_unlock_irq(&priv->lock);
671
672 return ret;
673 }
674
675 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
676 struct ipoib_path *path)
677 {
678 *path = iter->path;
679 }
680
681 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
682
683 void ipoib_mark_paths_invalid(struct net_device *dev)
684 {
685 struct ipoib_dev_priv *priv = ipoib_priv(dev);
686 struct ipoib_path *path, *tp;
687
688 spin_lock_irq(&priv->lock);
689
690 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
691 ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n",
692 be32_to_cpu(sa_path_get_dlid(&path->pathrec)),
693 path->pathrec.dgid.raw);
694 if (path->ah)
695 path->ah->valid = 0;
696 }
697
698 spin_unlock_irq(&priv->lock);
699 }
700
701 static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
702 {
703 struct ipoib_pseudo_header *phdr;
704
705 phdr = skb_push(skb, sizeof(*phdr));
706 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
707 }
708
709 void ipoib_flush_paths(struct net_device *dev)
710 {
711 struct ipoib_dev_priv *priv = ipoib_priv(dev);
712 struct ipoib_path *path, *tp;
713 LIST_HEAD(remove_list);
714 unsigned long flags;
715
716 netif_tx_lock_bh(dev);
717 spin_lock_irqsave(&priv->lock, flags);
718
719 list_splice_init(&priv->path_list, &remove_list);
720
721 list_for_each_entry(path, &remove_list, list)
722 rb_erase(&path->rb_node, &priv->path_tree);
723
724 list_for_each_entry_safe(path, tp, &remove_list, list) {
725 if (path->query)
726 ib_sa_cancel_query(path->query_id, path->query);
727 spin_unlock_irqrestore(&priv->lock, flags);
728 netif_tx_unlock_bh(dev);
729 wait_for_completion(&path->done);
730 path_free(dev, path);
731 netif_tx_lock_bh(dev);
732 spin_lock_irqsave(&priv->lock, flags);
733 }
734
735 spin_unlock_irqrestore(&priv->lock, flags);
736 netif_tx_unlock_bh(dev);
737 }
738
739 static void path_rec_completion(int status,
740 struct sa_path_rec *pathrec,
741 void *path_ptr)
742 {
743 struct ipoib_path *path = path_ptr;
744 struct net_device *dev = path->dev;
745 struct ipoib_dev_priv *priv = ipoib_priv(dev);
746 struct ipoib_ah *ah = NULL;
747 struct ipoib_ah *old_ah = NULL;
748 struct ipoib_neigh *neigh, *tn;
749 struct sk_buff_head skqueue;
750 struct sk_buff *skb;
751 unsigned long flags;
752
753 if (!status)
754 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
755 be32_to_cpu(sa_path_get_dlid(pathrec)),
756 pathrec->dgid.raw);
757 else
758 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
759 status, path->pathrec.dgid.raw);
760
761 skb_queue_head_init(&skqueue);
762
763 if (!status) {
764 struct rdma_ah_attr av;
765
766 if (!ib_init_ah_attr_from_path(priv->ca, priv->port,
767 pathrec, &av, NULL)) {
768 ah = ipoib_create_ah(dev, priv->pd, &av);
769 rdma_destroy_ah_attr(&av);
770 }
771 }
772
773 spin_lock_irqsave(&priv->lock, flags);
774
775 if (!IS_ERR_OR_NULL(ah)) {
776 /*
777 * pathrec.dgid is used as the database key from the LLADDR,
778 * it must remain unchanged even if the SA returns a different
779 * GID to use in the AH.
780 */
781 if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw,
782 sizeof(union ib_gid))) {
783 ipoib_dbg(
784 priv,
785 "%s got PathRec for gid %pI6 while asked for %pI6\n",
786 dev->name, pathrec->dgid.raw,
787 path->pathrec.dgid.raw);
788 memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw,
789 sizeof(union ib_gid));
790 }
791
792 path->pathrec = *pathrec;
793
794 old_ah = path->ah;
795 path->ah = ah;
796
797 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
798 ah, be32_to_cpu(sa_path_get_dlid(pathrec)),
799 pathrec->sl);
800
801 while ((skb = __skb_dequeue(&path->queue)))
802 __skb_queue_tail(&skqueue, skb);
803
804 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
805 if (neigh->ah) {
806 WARN_ON(neigh->ah != old_ah);
807 /*
808 * Dropping the ah reference inside
809 * priv->lock is safe here, because we
810 * will hold one more reference from
811 * the original value of path->ah (ie
812 * old_ah).
813 */
814 ipoib_put_ah(neigh->ah);
815 }
816 kref_get(&path->ah->ref);
817 neigh->ah = path->ah;
818
819 if (ipoib_cm_enabled(dev, neigh->daddr)) {
820 if (!ipoib_cm_get(neigh))
821 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
822 path,
823 neigh));
824 if (!ipoib_cm_get(neigh)) {
825 ipoib_neigh_free(neigh);
826 continue;
827 }
828 }
829
830 while ((skb = __skb_dequeue(&neigh->queue)))
831 __skb_queue_tail(&skqueue, skb);
832 }
833 path->ah->valid = 1;
834 }
835
836 path->query = NULL;
837 complete(&path->done);
838
839 spin_unlock_irqrestore(&priv->lock, flags);
840
841 if (IS_ERR_OR_NULL(ah))
842 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
843
844 if (old_ah)
845 ipoib_put_ah(old_ah);
846
847 while ((skb = __skb_dequeue(&skqueue))) {
848 int ret;
849 skb->dev = dev;
850 ret = dev_queue_xmit(skb);
851 if (ret)
852 ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n",
853 __func__, ret);
854 }
855 }
856
857 static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path,
858 void *gid)
859 {
860 path->dev = priv->dev;
861
862 if (rdma_cap_opa_ah(priv->ca, priv->port))
863 path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA;
864 else
865 path->pathrec.rec_type = SA_PATH_REC_TYPE_IB;
866
867 memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid));
868 path->pathrec.sgid = priv->local_gid;
869 path->pathrec.pkey = cpu_to_be16(priv->pkey);
870 path->pathrec.numb_path = 1;
871 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
872 }
873
874 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
875 {
876 struct ipoib_dev_priv *priv = ipoib_priv(dev);
877 struct ipoib_path *path;
878
879 if (!priv->broadcast)
880 return NULL;
881
882 path = kzalloc(sizeof(*path), GFP_ATOMIC);
883 if (!path)
884 return NULL;
885
886 skb_queue_head_init(&path->queue);
887
888 INIT_LIST_HEAD(&path->neigh_list);
889
890 init_path_rec(priv, path, gid);
891
892 return path;
893 }
894
895 static int path_rec_start(struct net_device *dev,
896 struct ipoib_path *path)
897 {
898 struct ipoib_dev_priv *priv = ipoib_priv(dev);
899
900 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
901 path->pathrec.dgid.raw);
902
903 init_completion(&path->done);
904
905 path->query_id =
906 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
907 &path->pathrec,
908 IB_SA_PATH_REC_DGID |
909 IB_SA_PATH_REC_SGID |
910 IB_SA_PATH_REC_NUMB_PATH |
911 IB_SA_PATH_REC_TRAFFIC_CLASS |
912 IB_SA_PATH_REC_PKEY,
913 1000, GFP_ATOMIC,
914 path_rec_completion,
915 path, &path->query);
916 if (path->query_id < 0) {
917 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
918 path->query = NULL;
919 complete(&path->done);
920 return path->query_id;
921 }
922
923 return 0;
924 }
925
926 static void neigh_refresh_path(struct ipoib_neigh *neigh, u8 *daddr,
927 struct net_device *dev)
928 {
929 struct ipoib_dev_priv *priv = ipoib_priv(dev);
930 struct ipoib_path *path;
931 unsigned long flags;
932
933 spin_lock_irqsave(&priv->lock, flags);
934
935 path = __path_find(dev, daddr + 4);
936 if (!path)
937 goto out;
938 if (!path->query)
939 path_rec_start(dev, path);
940 out:
941 spin_unlock_irqrestore(&priv->lock, flags);
942 }
943
944 static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr,
945 struct net_device *dev)
946 {
947 struct ipoib_dev_priv *priv = ipoib_priv(dev);
948 struct rdma_netdev *rn = netdev_priv(dev);
949 struct ipoib_path *path;
950 struct ipoib_neigh *neigh;
951 unsigned long flags;
952
953 spin_lock_irqsave(&priv->lock, flags);
954 neigh = ipoib_neigh_alloc(daddr, dev);
955 if (!neigh) {
956 spin_unlock_irqrestore(&priv->lock, flags);
957 ++dev->stats.tx_dropped;
958 dev_kfree_skb_any(skb);
959 return NULL;
960 }
961
962 /* To avoid race condition, make sure that the
963 * neigh will be added only once.
964 */
965 if (unlikely(!list_empty(&neigh->list))) {
966 spin_unlock_irqrestore(&priv->lock, flags);
967 return neigh;
968 }
969
970 path = __path_find(dev, daddr + 4);
971 if (!path) {
972 path = path_rec_create(dev, daddr + 4);
973 if (!path)
974 goto err_path;
975
976 __path_add(dev, path);
977 }
978
979 list_add_tail(&neigh->list, &path->neigh_list);
980
981 if (path->ah && path->ah->valid) {
982 kref_get(&path->ah->ref);
983 neigh->ah = path->ah;
984
985 if (ipoib_cm_enabled(dev, neigh->daddr)) {
986 if (!ipoib_cm_get(neigh))
987 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
988 if (!ipoib_cm_get(neigh)) {
989 ipoib_neigh_free(neigh);
990 goto err_drop;
991 }
992 if (skb_queue_len(&neigh->queue) <
993 IPOIB_MAX_PATH_REC_QUEUE) {
994 push_pseudo_header(skb, neigh->daddr);
995 __skb_queue_tail(&neigh->queue, skb);
996 } else {
997 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
998 skb_queue_len(&neigh->queue));
999 goto err_drop;
1000 }
1001 } else {
1002 spin_unlock_irqrestore(&priv->lock, flags);
1003 path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1004 IPOIB_QPN(daddr));
1005 ipoib_neigh_put(neigh);
1006 return NULL;
1007 }
1008 } else {
1009 neigh->ah = NULL;
1010
1011 if (!path->query && path_rec_start(dev, path))
1012 goto err_path;
1013 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1014 push_pseudo_header(skb, neigh->daddr);
1015 __skb_queue_tail(&neigh->queue, skb);
1016 } else {
1017 goto err_drop;
1018 }
1019 }
1020
1021 spin_unlock_irqrestore(&priv->lock, flags);
1022 ipoib_neigh_put(neigh);
1023 return NULL;
1024
1025 err_path:
1026 ipoib_neigh_free(neigh);
1027 err_drop:
1028 ++dev->stats.tx_dropped;
1029 dev_kfree_skb_any(skb);
1030
1031 spin_unlock_irqrestore(&priv->lock, flags);
1032 ipoib_neigh_put(neigh);
1033
1034 return NULL;
1035 }
1036
1037 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
1038 struct ipoib_pseudo_header *phdr)
1039 {
1040 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1041 struct rdma_netdev *rn = netdev_priv(dev);
1042 struct ipoib_path *path;
1043 unsigned long flags;
1044
1045 spin_lock_irqsave(&priv->lock, flags);
1046
1047 /* no broadcast means that all paths are (going to be) not valid */
1048 if (!priv->broadcast)
1049 goto drop_and_unlock;
1050
1051 path = __path_find(dev, phdr->hwaddr + 4);
1052 if (!path || !path->ah || !path->ah->valid) {
1053 if (!path) {
1054 path = path_rec_create(dev, phdr->hwaddr + 4);
1055 if (!path)
1056 goto drop_and_unlock;
1057 __path_add(dev, path);
1058 } else {
1059 /*
1060 * make sure there are no changes in the existing
1061 * path record
1062 */
1063 init_path_rec(priv, path, phdr->hwaddr + 4);
1064 }
1065 if (!path->query && path_rec_start(dev, path)) {
1066 goto drop_and_unlock;
1067 }
1068
1069 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1070 push_pseudo_header(skb, phdr->hwaddr);
1071 __skb_queue_tail(&path->queue, skb);
1072 goto unlock;
1073 } else {
1074 goto drop_and_unlock;
1075 }
1076 }
1077
1078 spin_unlock_irqrestore(&priv->lock, flags);
1079 ipoib_dbg(priv, "Send unicast ARP to %08x\n",
1080 be32_to_cpu(sa_path_get_dlid(&path->pathrec)));
1081 path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1082 IPOIB_QPN(phdr->hwaddr));
1083 return;
1084
1085 drop_and_unlock:
1086 ++dev->stats.tx_dropped;
1087 dev_kfree_skb_any(skb);
1088 unlock:
1089 spin_unlock_irqrestore(&priv->lock, flags);
1090 }
1091
1092 static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
1093 {
1094 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1095 struct rdma_netdev *rn = netdev_priv(dev);
1096 struct ipoib_neigh *neigh;
1097 struct ipoib_pseudo_header *phdr;
1098 struct ipoib_header *header;
1099 unsigned long flags;
1100
1101 phdr = (struct ipoib_pseudo_header *) skb->data;
1102 skb_pull(skb, sizeof(*phdr));
1103 header = (struct ipoib_header *) skb->data;
1104
1105 if (unlikely(phdr->hwaddr[4] == 0xff)) {
1106 /* multicast, arrange "if" according to probability */
1107 if ((header->proto != htons(ETH_P_IP)) &&
1108 (header->proto != htons(ETH_P_IPV6)) &&
1109 (header->proto != htons(ETH_P_ARP)) &&
1110 (header->proto != htons(ETH_P_RARP)) &&
1111 (header->proto != htons(ETH_P_TIPC))) {
1112 /* ethertype not supported by IPoIB */
1113 ++dev->stats.tx_dropped;
1114 dev_kfree_skb_any(skb);
1115 return NETDEV_TX_OK;
1116 }
1117 /* Add in the P_Key for multicast*/
1118 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
1119 phdr->hwaddr[9] = priv->pkey & 0xff;
1120
1121 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1122 if (likely(neigh))
1123 goto send_using_neigh;
1124 ipoib_mcast_send(dev, phdr->hwaddr, skb);
1125 return NETDEV_TX_OK;
1126 }
1127
1128 /* unicast, arrange "switch" according to probability */
1129 switch (header->proto) {
1130 case htons(ETH_P_IP):
1131 case htons(ETH_P_IPV6):
1132 case htons(ETH_P_TIPC):
1133 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1134 if (unlikely(!neigh)) {
1135 neigh = neigh_add_path(skb, phdr->hwaddr, dev);
1136 if (likely(!neigh))
1137 return NETDEV_TX_OK;
1138 }
1139 break;
1140 case htons(ETH_P_ARP):
1141 case htons(ETH_P_RARP):
1142 /* for unicast ARP and RARP should always perform path find */
1143 unicast_arp_send(skb, dev, phdr);
1144 return NETDEV_TX_OK;
1145 default:
1146 /* ethertype not supported by IPoIB */
1147 ++dev->stats.tx_dropped;
1148 dev_kfree_skb_any(skb);
1149 return NETDEV_TX_OK;
1150 }
1151
1152 send_using_neigh:
1153 /* note we now hold a ref to neigh */
1154 if (ipoib_cm_get(neigh)) {
1155 if (ipoib_cm_up(neigh)) {
1156 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1157 goto unref;
1158 }
1159 } else if (neigh->ah && neigh->ah->valid) {
1160 neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah,
1161 IPOIB_QPN(phdr->hwaddr));
1162 goto unref;
1163 } else if (neigh->ah) {
1164 neigh_refresh_path(neigh, phdr->hwaddr, dev);
1165 }
1166
1167 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1168 push_pseudo_header(skb, phdr->hwaddr);
1169 spin_lock_irqsave(&priv->lock, flags);
1170 __skb_queue_tail(&neigh->queue, skb);
1171 spin_unlock_irqrestore(&priv->lock, flags);
1172 } else {
1173 ++dev->stats.tx_dropped;
1174 dev_kfree_skb_any(skb);
1175 }
1176
1177 unref:
1178 ipoib_neigh_put(neigh);
1179
1180 return NETDEV_TX_OK;
1181 }
1182
1183 static void ipoib_timeout(struct net_device *dev, unsigned int txqueue)
1184 {
1185 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1186
1187 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1188 jiffies_to_msecs(jiffies - dev_trans_start(dev)));
1189 ipoib_warn(priv,
1190 "queue stopped %d, tx_head %u, tx_tail %u, global_tx_head %u, global_tx_tail %u\n",
1191 netif_queue_stopped(dev), priv->tx_head, priv->tx_tail,
1192 priv->global_tx_head, priv->global_tx_tail);
1193
1194 /* XXX reset QP, etc. */
1195 }
1196
1197 static int ipoib_hard_header(struct sk_buff *skb,
1198 struct net_device *dev,
1199 unsigned short type,
1200 const void *daddr,
1201 const void *saddr,
1202 unsigned int len)
1203 {
1204 struct ipoib_header *header;
1205
1206 header = skb_push(skb, sizeof(*header));
1207
1208 header->proto = htons(type);
1209 header->reserved = 0;
1210
1211 /*
1212 * we don't rely on dst_entry structure, always stuff the
1213 * destination address into skb hard header so we can figure out where
1214 * to send the packet later.
1215 */
1216 push_pseudo_header(skb, daddr);
1217
1218 return IPOIB_HARD_LEN;
1219 }
1220
1221 static void ipoib_set_mcast_list(struct net_device *dev)
1222 {
1223 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1224
1225 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1226 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1227 return;
1228 }
1229
1230 queue_work(priv->wq, &priv->restart_task);
1231 }
1232
1233 static int ipoib_get_iflink(const struct net_device *dev)
1234 {
1235 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1236
1237 /* parent interface */
1238 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1239 return dev->ifindex;
1240
1241 /* child/vlan interface */
1242 return priv->parent->ifindex;
1243 }
1244
1245 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1246 {
1247 /*
1248 * Use only the address parts that contributes to spreading
1249 * The subnet prefix is not used as one can not connect to
1250 * same remote port (GUID) using the same remote QPN via two
1251 * different subnets.
1252 */
1253 /* qpn octets[1:4) & port GUID octets[12:20) */
1254 u32 *d32 = (u32 *) daddr;
1255 u32 hv;
1256
1257 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1258 return hv & htbl->mask;
1259 }
1260
1261 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1262 {
1263 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1264 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1265 struct ipoib_neigh_hash *htbl;
1266 struct ipoib_neigh *neigh = NULL;
1267 u32 hash_val;
1268
1269 rcu_read_lock_bh();
1270
1271 htbl = rcu_dereference_bh(ntbl->htbl);
1272
1273 if (!htbl)
1274 goto out_unlock;
1275
1276 hash_val = ipoib_addr_hash(htbl, daddr);
1277 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1278 neigh != NULL;
1279 neigh = rcu_dereference_bh(neigh->hnext)) {
1280 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1281 /* found, take one ref on behalf of the caller */
1282 if (!atomic_inc_not_zero(&neigh->refcnt)) {
1283 /* deleted */
1284 neigh = NULL;
1285 goto out_unlock;
1286 }
1287
1288 if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
1289 neigh->alive = jiffies;
1290 goto out_unlock;
1291 }
1292 }
1293
1294 out_unlock:
1295 rcu_read_unlock_bh();
1296 return neigh;
1297 }
1298
1299 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1300 {
1301 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1302 struct ipoib_neigh_hash *htbl;
1303 unsigned long neigh_obsolete;
1304 unsigned long dt;
1305 unsigned long flags;
1306 int i;
1307 LIST_HEAD(remove_list);
1308
1309 spin_lock_irqsave(&priv->lock, flags);
1310
1311 htbl = rcu_dereference_protected(ntbl->htbl,
1312 lockdep_is_held(&priv->lock));
1313
1314 if (!htbl)
1315 goto out_unlock;
1316
1317 /* neigh is obsolete if it was idle for two GC periods */
1318 dt = 2 * arp_tbl.gc_interval;
1319 neigh_obsolete = jiffies - dt;
1320
1321 for (i = 0; i < htbl->size; i++) {
1322 struct ipoib_neigh *neigh;
1323 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1324
1325 while ((neigh = rcu_dereference_protected(*np,
1326 lockdep_is_held(&priv->lock))) != NULL) {
1327 /* was the neigh idle for two GC periods */
1328 if (time_after(neigh_obsolete, neigh->alive)) {
1329
1330 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1331
1332 rcu_assign_pointer(*np,
1333 rcu_dereference_protected(neigh->hnext,
1334 lockdep_is_held(&priv->lock)));
1335 /* remove from path/mc list */
1336 list_del_init(&neigh->list);
1337 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1338 } else {
1339 np = &neigh->hnext;
1340 }
1341
1342 }
1343 }
1344
1345 out_unlock:
1346 spin_unlock_irqrestore(&priv->lock, flags);
1347 ipoib_mcast_remove_list(&remove_list);
1348 }
1349
1350 static void ipoib_reap_neigh(struct work_struct *work)
1351 {
1352 struct ipoib_dev_priv *priv =
1353 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1354
1355 __ipoib_reap_neigh(priv);
1356
1357 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1358 arp_tbl.gc_interval);
1359 }
1360
1361
1362 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1363 struct net_device *dev)
1364 {
1365 struct ipoib_neigh *neigh;
1366
1367 neigh = kzalloc(sizeof(*neigh), GFP_ATOMIC);
1368 if (!neigh)
1369 return NULL;
1370
1371 neigh->dev = dev;
1372 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1373 skb_queue_head_init(&neigh->queue);
1374 INIT_LIST_HEAD(&neigh->list);
1375 ipoib_cm_set(neigh, NULL);
1376 /* one ref on behalf of the caller */
1377 atomic_set(&neigh->refcnt, 1);
1378
1379 return neigh;
1380 }
1381
1382 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1383 struct net_device *dev)
1384 {
1385 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1386 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1387 struct ipoib_neigh_hash *htbl;
1388 struct ipoib_neigh *neigh;
1389 u32 hash_val;
1390
1391 htbl = rcu_dereference_protected(ntbl->htbl,
1392 lockdep_is_held(&priv->lock));
1393 if (!htbl) {
1394 neigh = NULL;
1395 goto out_unlock;
1396 }
1397
1398 /* need to add a new neigh, but maybe some other thread succeeded?
1399 * recalc hash, maybe hash resize took place so we do a search
1400 */
1401 hash_val = ipoib_addr_hash(htbl, daddr);
1402 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1403 lockdep_is_held(&priv->lock));
1404 neigh != NULL;
1405 neigh = rcu_dereference_protected(neigh->hnext,
1406 lockdep_is_held(&priv->lock))) {
1407 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1408 /* found, take one ref on behalf of the caller */
1409 if (!atomic_inc_not_zero(&neigh->refcnt)) {
1410 /* deleted */
1411 neigh = NULL;
1412 break;
1413 }
1414 neigh->alive = jiffies;
1415 goto out_unlock;
1416 }
1417 }
1418
1419 neigh = ipoib_neigh_ctor(daddr, dev);
1420 if (!neigh)
1421 goto out_unlock;
1422
1423 /* one ref on behalf of the hash table */
1424 atomic_inc(&neigh->refcnt);
1425 neigh->alive = jiffies;
1426 /* put in hash */
1427 rcu_assign_pointer(neigh->hnext,
1428 rcu_dereference_protected(htbl->buckets[hash_val],
1429 lockdep_is_held(&priv->lock)));
1430 rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1431 atomic_inc(&ntbl->entries);
1432
1433 out_unlock:
1434
1435 return neigh;
1436 }
1437
1438 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1439 {
1440 /* neigh reference count was dropprd to zero */
1441 struct net_device *dev = neigh->dev;
1442 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1443 struct sk_buff *skb;
1444 if (neigh->ah)
1445 ipoib_put_ah(neigh->ah);
1446 while ((skb = __skb_dequeue(&neigh->queue))) {
1447 ++dev->stats.tx_dropped;
1448 dev_kfree_skb_any(skb);
1449 }
1450 if (ipoib_cm_get(neigh))
1451 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1452 ipoib_dbg(ipoib_priv(dev),
1453 "neigh free for %06x %pI6\n",
1454 IPOIB_QPN(neigh->daddr),
1455 neigh->daddr + 4);
1456 kfree(neigh);
1457 if (atomic_dec_and_test(&priv->ntbl.entries)) {
1458 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1459 complete(&priv->ntbl.flushed);
1460 }
1461 }
1462
1463 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1464 {
1465 /* Called as a result of removal from hash table */
1466 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1467 /* note TX context may hold another ref */
1468 ipoib_neigh_put(neigh);
1469 }
1470
1471 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1472 {
1473 struct net_device *dev = neigh->dev;
1474 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1475 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1476 struct ipoib_neigh_hash *htbl;
1477 struct ipoib_neigh __rcu **np;
1478 struct ipoib_neigh *n;
1479 u32 hash_val;
1480
1481 htbl = rcu_dereference_protected(ntbl->htbl,
1482 lockdep_is_held(&priv->lock));
1483 if (!htbl)
1484 return;
1485
1486 hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1487 np = &htbl->buckets[hash_val];
1488 for (n = rcu_dereference_protected(*np,
1489 lockdep_is_held(&priv->lock));
1490 n != NULL;
1491 n = rcu_dereference_protected(*np,
1492 lockdep_is_held(&priv->lock))) {
1493 if (n == neigh) {
1494 /* found */
1495 rcu_assign_pointer(*np,
1496 rcu_dereference_protected(neigh->hnext,
1497 lockdep_is_held(&priv->lock)));
1498 /* remove from parent list */
1499 list_del_init(&neigh->list);
1500 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1501 return;
1502 } else {
1503 np = &n->hnext;
1504 }
1505 }
1506 }
1507
1508 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1509 {
1510 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1511 struct ipoib_neigh_hash *htbl;
1512 struct ipoib_neigh __rcu **buckets;
1513 u32 size;
1514
1515 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1516 ntbl->htbl = NULL;
1517 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1518 if (!htbl)
1519 return -ENOMEM;
1520 size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1521 buckets = kvcalloc(size, sizeof(*buckets), GFP_KERNEL);
1522 if (!buckets) {
1523 kfree(htbl);
1524 return -ENOMEM;
1525 }
1526 htbl->size = size;
1527 htbl->mask = (size - 1);
1528 htbl->buckets = buckets;
1529 RCU_INIT_POINTER(ntbl->htbl, htbl);
1530 htbl->ntbl = ntbl;
1531 atomic_set(&ntbl->entries, 0);
1532
1533 /* start garbage collection */
1534 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1535 arp_tbl.gc_interval);
1536
1537 return 0;
1538 }
1539
1540 static void neigh_hash_free_rcu(struct rcu_head *head)
1541 {
1542 struct ipoib_neigh_hash *htbl = container_of(head,
1543 struct ipoib_neigh_hash,
1544 rcu);
1545 struct ipoib_neigh __rcu **buckets = htbl->buckets;
1546 struct ipoib_neigh_table *ntbl = htbl->ntbl;
1547
1548 kvfree(buckets);
1549 kfree(htbl);
1550 complete(&ntbl->deleted);
1551 }
1552
1553 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1554 {
1555 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1556 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1557 struct ipoib_neigh_hash *htbl;
1558 unsigned long flags;
1559 int i;
1560
1561 /* remove all neigh connected to a given path or mcast */
1562 spin_lock_irqsave(&priv->lock, flags);
1563
1564 htbl = rcu_dereference_protected(ntbl->htbl,
1565 lockdep_is_held(&priv->lock));
1566
1567 if (!htbl)
1568 goto out_unlock;
1569
1570 for (i = 0; i < htbl->size; i++) {
1571 struct ipoib_neigh *neigh;
1572 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1573
1574 while ((neigh = rcu_dereference_protected(*np,
1575 lockdep_is_held(&priv->lock))) != NULL) {
1576 /* delete neighs belong to this parent */
1577 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1578 rcu_assign_pointer(*np,
1579 rcu_dereference_protected(neigh->hnext,
1580 lockdep_is_held(&priv->lock)));
1581 /* remove from parent list */
1582 list_del_init(&neigh->list);
1583 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1584 } else {
1585 np = &neigh->hnext;
1586 }
1587
1588 }
1589 }
1590 out_unlock:
1591 spin_unlock_irqrestore(&priv->lock, flags);
1592 }
1593
1594 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1595 {
1596 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1597 struct ipoib_neigh_hash *htbl;
1598 unsigned long flags;
1599 int i, wait_flushed = 0;
1600
1601 init_completion(&priv->ntbl.flushed);
1602 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1603
1604 spin_lock_irqsave(&priv->lock, flags);
1605
1606 htbl = rcu_dereference_protected(ntbl->htbl,
1607 lockdep_is_held(&priv->lock));
1608 if (!htbl)
1609 goto out_unlock;
1610
1611 wait_flushed = atomic_read(&priv->ntbl.entries);
1612 if (!wait_flushed)
1613 goto free_htbl;
1614
1615 for (i = 0; i < htbl->size; i++) {
1616 struct ipoib_neigh *neigh;
1617 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1618
1619 while ((neigh = rcu_dereference_protected(*np,
1620 lockdep_is_held(&priv->lock))) != NULL) {
1621 rcu_assign_pointer(*np,
1622 rcu_dereference_protected(neigh->hnext,
1623 lockdep_is_held(&priv->lock)));
1624 /* remove from path/mc list */
1625 list_del_init(&neigh->list);
1626 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1627 }
1628 }
1629
1630 free_htbl:
1631 rcu_assign_pointer(ntbl->htbl, NULL);
1632 call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1633
1634 out_unlock:
1635 spin_unlock_irqrestore(&priv->lock, flags);
1636 if (wait_flushed)
1637 wait_for_completion(&priv->ntbl.flushed);
1638 }
1639
1640 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1641 {
1642 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1643
1644 ipoib_dbg(priv, "%s\n", __func__);
1645 init_completion(&priv->ntbl.deleted);
1646
1647 cancel_delayed_work_sync(&priv->neigh_reap_task);
1648
1649 ipoib_flush_neighs(priv);
1650
1651 wait_for_completion(&priv->ntbl.deleted);
1652 }
1653
1654 static void ipoib_napi_add(struct net_device *dev)
1655 {
1656 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1657
1658 netif_napi_add(dev, &priv->recv_napi, ipoib_rx_poll, IPOIB_NUM_WC);
1659 netif_napi_add(dev, &priv->send_napi, ipoib_tx_poll, MAX_SEND_CQE);
1660 }
1661
1662 static void ipoib_napi_del(struct net_device *dev)
1663 {
1664 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1665
1666 netif_napi_del(&priv->recv_napi);
1667 netif_napi_del(&priv->send_napi);
1668 }
1669
1670 static void ipoib_dev_uninit_default(struct net_device *dev)
1671 {
1672 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1673
1674 ipoib_transport_dev_cleanup(dev);
1675
1676 ipoib_napi_del(dev);
1677
1678 ipoib_cm_dev_cleanup(dev);
1679
1680 kfree(priv->rx_ring);
1681 vfree(priv->tx_ring);
1682
1683 priv->rx_ring = NULL;
1684 priv->tx_ring = NULL;
1685 }
1686
1687 static int ipoib_dev_init_default(struct net_device *dev)
1688 {
1689 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1690
1691 ipoib_napi_add(dev);
1692
1693 /* Allocate RX/TX "rings" to hold queued skbs */
1694 priv->rx_ring = kcalloc(ipoib_recvq_size,
1695 sizeof(*priv->rx_ring),
1696 GFP_KERNEL);
1697 if (!priv->rx_ring)
1698 goto out;
1699
1700 priv->tx_ring = vzalloc(array_size(ipoib_sendq_size,
1701 sizeof(*priv->tx_ring)));
1702 if (!priv->tx_ring) {
1703 pr_warn("%s: failed to allocate TX ring (%d entries)\n",
1704 priv->ca->name, ipoib_sendq_size);
1705 goto out_rx_ring_cleanup;
1706 }
1707
1708 /* priv->tx_head, tx_tail and global_tx_tail/head are already 0 */
1709
1710 if (ipoib_transport_dev_init(dev, priv->ca)) {
1711 pr_warn("%s: ipoib_transport_dev_init failed\n",
1712 priv->ca->name);
1713 goto out_tx_ring_cleanup;
1714 }
1715
1716 /* after qp created set dev address */
1717 priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff;
1718 priv->dev->dev_addr[2] = (priv->qp->qp_num >> 8) & 0xff;
1719 priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff;
1720
1721 return 0;
1722
1723 out_tx_ring_cleanup:
1724 vfree(priv->tx_ring);
1725
1726 out_rx_ring_cleanup:
1727 kfree(priv->rx_ring);
1728
1729 out:
1730 ipoib_napi_del(dev);
1731 return -ENOMEM;
1732 }
1733
1734 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
1735 int cmd)
1736 {
1737 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1738
1739 if (!priv->rn_ops->ndo_do_ioctl)
1740 return -EOPNOTSUPP;
1741
1742 return priv->rn_ops->ndo_do_ioctl(dev, ifr, cmd);
1743 }
1744
1745 static int ipoib_dev_init(struct net_device *dev)
1746 {
1747 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1748 int ret = -ENOMEM;
1749
1750 priv->qp = NULL;
1751
1752 /*
1753 * the various IPoIB tasks assume they will never race against
1754 * themselves, so always use a single thread workqueue
1755 */
1756 priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM);
1757 if (!priv->wq) {
1758 pr_warn("%s: failed to allocate device WQ\n", dev->name);
1759 goto out;
1760 }
1761
1762 /* create pd, which used both for control and datapath*/
1763 priv->pd = ib_alloc_pd(priv->ca, 0);
1764 if (IS_ERR(priv->pd)) {
1765 pr_warn("%s: failed to allocate PD\n", priv->ca->name);
1766 goto clean_wq;
1767 }
1768
1769 ret = priv->rn_ops->ndo_init(dev);
1770 if (ret) {
1771 pr_warn("%s failed to init HW resource\n", dev->name);
1772 goto out_free_pd;
1773 }
1774
1775 ret = ipoib_neigh_hash_init(priv);
1776 if (ret) {
1777 pr_warn("%s failed to init neigh hash\n", dev->name);
1778 goto out_dev_uninit;
1779 }
1780
1781 if (dev->flags & IFF_UP) {
1782 if (ipoib_ib_dev_open(dev)) {
1783 pr_warn("%s failed to open device\n", dev->name);
1784 ret = -ENODEV;
1785 goto out_hash_uninit;
1786 }
1787 }
1788
1789 return 0;
1790
1791 out_hash_uninit:
1792 ipoib_neigh_hash_uninit(dev);
1793
1794 out_dev_uninit:
1795 ipoib_ib_dev_cleanup(dev);
1796
1797 out_free_pd:
1798 if (priv->pd) {
1799 ib_dealloc_pd(priv->pd);
1800 priv->pd = NULL;
1801 }
1802
1803 clean_wq:
1804 if (priv->wq) {
1805 destroy_workqueue(priv->wq);
1806 priv->wq = NULL;
1807 }
1808
1809 out:
1810 return ret;
1811 }
1812
1813 /*
1814 * This must be called before doing an unregister_netdev on a parent device to
1815 * shutdown the IB event handler.
1816 */
1817 static void ipoib_parent_unregister_pre(struct net_device *ndev)
1818 {
1819 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1820
1821 /*
1822 * ipoib_set_mac checks netif_running before pushing work, clearing
1823 * running ensures the it will not add more work.
1824 */
1825 rtnl_lock();
1826 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP, NULL);
1827 rtnl_unlock();
1828
1829 /* ipoib_event() cannot be running once this returns */
1830 ib_unregister_event_handler(&priv->event_handler);
1831
1832 /*
1833 * Work on the queue grabs the rtnl lock, so this cannot be done while
1834 * also holding it.
1835 */
1836 flush_workqueue(ipoib_workqueue);
1837 }
1838
1839 static void ipoib_set_dev_features(struct ipoib_dev_priv *priv)
1840 {
1841 priv->hca_caps = priv->ca->attrs.device_cap_flags;
1842
1843 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1844 priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1845
1846 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1847 priv->dev->hw_features |= NETIF_F_TSO;
1848
1849 priv->dev->features |= priv->dev->hw_features;
1850 }
1851 }
1852
1853 static int ipoib_parent_init(struct net_device *ndev)
1854 {
1855 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1856 struct ib_port_attr attr;
1857 int result;
1858
1859 result = ib_query_port(priv->ca, priv->port, &attr);
1860 if (result) {
1861 pr_warn("%s: ib_query_port %d failed\n", priv->ca->name,
1862 priv->port);
1863 return result;
1864 }
1865 priv->max_ib_mtu = rdma_mtu_from_attr(priv->ca, priv->port, &attr);
1866
1867 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
1868 if (result) {
1869 pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n",
1870 priv->ca->name, priv->port, result);
1871 return result;
1872 }
1873
1874 result = rdma_query_gid(priv->ca, priv->port, 0, &priv->local_gid);
1875 if (result) {
1876 pr_warn("%s: rdma_query_gid port %d failed (ret = %d)\n",
1877 priv->ca->name, priv->port, result);
1878 return result;
1879 }
1880 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw,
1881 sizeof(union ib_gid));
1882
1883 SET_NETDEV_DEV(priv->dev, priv->ca->dev.parent);
1884 priv->dev->dev_port = priv->port - 1;
1885 /* Let's set this one too for backwards compatibility. */
1886 priv->dev->dev_id = priv->port - 1;
1887
1888 return 0;
1889 }
1890
1891 static void ipoib_child_init(struct net_device *ndev)
1892 {
1893 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1894 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1895
1896 priv->max_ib_mtu = ppriv->max_ib_mtu;
1897 set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
1898 if (memchr_inv(priv->dev->dev_addr, 0, INFINIBAND_ALEN))
1899 memcpy(&priv->local_gid, priv->dev->dev_addr + 4,
1900 sizeof(priv->local_gid));
1901 else {
1902 memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr,
1903 INFINIBAND_ALEN);
1904 memcpy(&priv->local_gid, &ppriv->local_gid,
1905 sizeof(priv->local_gid));
1906 }
1907 }
1908
1909 static int ipoib_ndo_init(struct net_device *ndev)
1910 {
1911 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1912 int rc;
1913 struct rdma_netdev *rn = netdev_priv(ndev);
1914
1915 if (priv->parent) {
1916 ipoib_child_init(ndev);
1917 } else {
1918 rc = ipoib_parent_init(ndev);
1919 if (rc)
1920 return rc;
1921 }
1922
1923 /* MTU will be reset when mcast join happens */
1924 ndev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1925 priv->mcast_mtu = priv->admin_mtu = ndev->mtu;
1926 rn->mtu = priv->mcast_mtu;
1927 ndev->max_mtu = IPOIB_CM_MTU;
1928
1929 ndev->neigh_priv_len = sizeof(struct ipoib_neigh);
1930
1931 /*
1932 * Set the full membership bit, so that we join the right
1933 * broadcast group, etc.
1934 */
1935 priv->pkey |= 0x8000;
1936
1937 ndev->broadcast[8] = priv->pkey >> 8;
1938 ndev->broadcast[9] = priv->pkey & 0xff;
1939 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1940
1941 ipoib_set_dev_features(priv);
1942
1943 rc = ipoib_dev_init(ndev);
1944 if (rc) {
1945 pr_warn("%s: failed to initialize device: %s port %d (ret = %d)\n",
1946 priv->ca->name, priv->dev->name, priv->port, rc);
1947 return rc;
1948 }
1949
1950 if (priv->parent) {
1951 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1952
1953 dev_hold(priv->parent);
1954
1955 down_write(&ppriv->vlan_rwsem);
1956 list_add_tail(&priv->list, &ppriv->child_intfs);
1957 up_write(&ppriv->vlan_rwsem);
1958 }
1959
1960 return 0;
1961 }
1962
1963 static void ipoib_ndo_uninit(struct net_device *dev)
1964 {
1965 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1966
1967 ASSERT_RTNL();
1968
1969 /*
1970 * ipoib_remove_one guarantees the children are removed before the
1971 * parent, and that is the only place where a parent can be removed.
1972 */
1973 WARN_ON(!list_empty(&priv->child_intfs));
1974
1975 if (priv->parent) {
1976 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1977
1978 down_write(&ppriv->vlan_rwsem);
1979 list_del(&priv->list);
1980 up_write(&ppriv->vlan_rwsem);
1981 }
1982
1983 ipoib_neigh_hash_uninit(dev);
1984
1985 ipoib_ib_dev_cleanup(dev);
1986
1987 /* no more works over the priv->wq */
1988 if (priv->wq) {
1989 /* See ipoib_mcast_carrier_on_task() */
1990 WARN_ON(test_bit(IPOIB_FLAG_OPER_UP, &priv->flags));
1991 flush_workqueue(priv->wq);
1992 destroy_workqueue(priv->wq);
1993 priv->wq = NULL;
1994 }
1995
1996 if (priv->parent)
1997 dev_put(priv->parent);
1998 }
1999
2000 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
2001 {
2002 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2003
2004 return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
2005 }
2006
2007 static int ipoib_get_vf_config(struct net_device *dev, int vf,
2008 struct ifla_vf_info *ivf)
2009 {
2010 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2011 int err;
2012
2013 err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
2014 if (err)
2015 return err;
2016
2017 ivf->vf = vf;
2018 memcpy(ivf->mac, dev->dev_addr, dev->addr_len);
2019
2020 return 0;
2021 }
2022
2023 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
2024 {
2025 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2026
2027 if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
2028 return -EINVAL;
2029
2030 return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
2031 }
2032
2033 static int ipoib_get_vf_guid(struct net_device *dev, int vf,
2034 struct ifla_vf_guid *node_guid,
2035 struct ifla_vf_guid *port_guid)
2036 {
2037 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2038
2039 return ib_get_vf_guid(priv->ca, vf, priv->port, node_guid, port_guid);
2040 }
2041
2042 static int ipoib_get_vf_stats(struct net_device *dev, int vf,
2043 struct ifla_vf_stats *vf_stats)
2044 {
2045 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2046
2047 return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
2048 }
2049
2050 static const struct header_ops ipoib_header_ops = {
2051 .create = ipoib_hard_header,
2052 };
2053
2054 static const struct net_device_ops ipoib_netdev_ops_pf = {
2055 .ndo_init = ipoib_ndo_init,
2056 .ndo_uninit = ipoib_ndo_uninit,
2057 .ndo_open = ipoib_open,
2058 .ndo_stop = ipoib_stop,
2059 .ndo_change_mtu = ipoib_change_mtu,
2060 .ndo_fix_features = ipoib_fix_features,
2061 .ndo_start_xmit = ipoib_start_xmit,
2062 .ndo_tx_timeout = ipoib_timeout,
2063 .ndo_set_rx_mode = ipoib_set_mcast_list,
2064 .ndo_get_iflink = ipoib_get_iflink,
2065 .ndo_set_vf_link_state = ipoib_set_vf_link_state,
2066 .ndo_get_vf_config = ipoib_get_vf_config,
2067 .ndo_get_vf_stats = ipoib_get_vf_stats,
2068 .ndo_get_vf_guid = ipoib_get_vf_guid,
2069 .ndo_set_vf_guid = ipoib_set_vf_guid,
2070 .ndo_set_mac_address = ipoib_set_mac,
2071 .ndo_get_stats64 = ipoib_get_stats,
2072 .ndo_do_ioctl = ipoib_ioctl,
2073 };
2074
2075 static const struct net_device_ops ipoib_netdev_ops_vf = {
2076 .ndo_init = ipoib_ndo_init,
2077 .ndo_uninit = ipoib_ndo_uninit,
2078 .ndo_open = ipoib_open,
2079 .ndo_stop = ipoib_stop,
2080 .ndo_change_mtu = ipoib_change_mtu,
2081 .ndo_fix_features = ipoib_fix_features,
2082 .ndo_start_xmit = ipoib_start_xmit,
2083 .ndo_tx_timeout = ipoib_timeout,
2084 .ndo_set_rx_mode = ipoib_set_mcast_list,
2085 .ndo_get_iflink = ipoib_get_iflink,
2086 .ndo_get_stats64 = ipoib_get_stats,
2087 .ndo_do_ioctl = ipoib_ioctl,
2088 };
2089
2090 static const struct net_device_ops ipoib_netdev_default_pf = {
2091 .ndo_init = ipoib_dev_init_default,
2092 .ndo_uninit = ipoib_dev_uninit_default,
2093 .ndo_open = ipoib_ib_dev_open_default,
2094 .ndo_stop = ipoib_ib_dev_stop_default,
2095 };
2096
2097 void ipoib_setup_common(struct net_device *dev)
2098 {
2099 dev->header_ops = &ipoib_header_ops;
2100 dev->netdev_ops = &ipoib_netdev_default_pf;
2101
2102 ipoib_set_ethtool_ops(dev);
2103
2104 dev->watchdog_timeo = HZ;
2105
2106 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
2107
2108 dev->hard_header_len = IPOIB_HARD_LEN;
2109 dev->addr_len = INFINIBAND_ALEN;
2110 dev->type = ARPHRD_INFINIBAND;
2111 dev->tx_queue_len = ipoib_sendq_size * 2;
2112 dev->features = (NETIF_F_VLAN_CHALLENGED |
2113 NETIF_F_HIGHDMA);
2114 netif_keep_dst(dev);
2115
2116 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
2117
2118 /*
2119 * unregister_netdev always frees the netdev, we use this mode
2120 * consistently to unify all the various unregister paths, including
2121 * those connected to rtnl_link_ops which require it.
2122 */
2123 dev->needs_free_netdev = true;
2124 }
2125
2126 static void ipoib_build_priv(struct net_device *dev)
2127 {
2128 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2129
2130 priv->dev = dev;
2131 spin_lock_init(&priv->lock);
2132 init_rwsem(&priv->vlan_rwsem);
2133 mutex_init(&priv->mcast_mutex);
2134
2135 INIT_LIST_HEAD(&priv->path_list);
2136 INIT_LIST_HEAD(&priv->child_intfs);
2137 INIT_LIST_HEAD(&priv->dead_ahs);
2138 INIT_LIST_HEAD(&priv->multicast_list);
2139
2140 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
2141 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
2142 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
2143 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
2144 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
2145 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
2146 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
2147 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
2148 }
2149
2150 static struct net_device *ipoib_alloc_netdev(struct ib_device *hca, u8 port,
2151 const char *name)
2152 {
2153 struct net_device *dev;
2154
2155 dev = rdma_alloc_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
2156 NET_NAME_UNKNOWN, ipoib_setup_common);
2157 if (!IS_ERR(dev) || PTR_ERR(dev) != -EOPNOTSUPP)
2158 return dev;
2159
2160 dev = alloc_netdev(sizeof(struct rdma_netdev), name, NET_NAME_UNKNOWN,
2161 ipoib_setup_common);
2162 if (!dev)
2163 return ERR_PTR(-ENOMEM);
2164 return dev;
2165 }
2166
2167 int ipoib_intf_init(struct ib_device *hca, u8 port, const char *name,
2168 struct net_device *dev)
2169 {
2170 struct rdma_netdev *rn = netdev_priv(dev);
2171 struct ipoib_dev_priv *priv;
2172 int rc;
2173
2174 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2175 if (!priv)
2176 return -ENOMEM;
2177
2178 priv->ca = hca;
2179 priv->port = port;
2180
2181 rc = rdma_init_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
2182 NET_NAME_UNKNOWN, ipoib_setup_common, dev);
2183 if (rc) {
2184 if (rc != -EOPNOTSUPP)
2185 goto out;
2186
2187 rn->send = ipoib_send;
2188 rn->attach_mcast = ipoib_mcast_attach;
2189 rn->detach_mcast = ipoib_mcast_detach;
2190 rn->hca = hca;
2191 }
2192
2193 priv->rn_ops = dev->netdev_ops;
2194
2195 if (hca->attrs.device_cap_flags & IB_DEVICE_VIRTUAL_FUNCTION)
2196 dev->netdev_ops = &ipoib_netdev_ops_vf;
2197 else
2198 dev->netdev_ops = &ipoib_netdev_ops_pf;
2199
2200 rn->clnt_priv = priv;
2201 /*
2202 * Only the child register_netdev flows can handle priv_destructor
2203 * being set, so we force it to NULL here and handle manually until it
2204 * is safe to turn on.
2205 */
2206 priv->next_priv_destructor = dev->priv_destructor;
2207 dev->priv_destructor = NULL;
2208
2209 ipoib_build_priv(dev);
2210
2211 return 0;
2212
2213 out:
2214 kfree(priv);
2215 return rc;
2216 }
2217
2218 struct net_device *ipoib_intf_alloc(struct ib_device *hca, u8 port,
2219 const char *name)
2220 {
2221 struct net_device *dev;
2222 int rc;
2223
2224 dev = ipoib_alloc_netdev(hca, port, name);
2225 if (IS_ERR(dev))
2226 return dev;
2227
2228 rc = ipoib_intf_init(hca, port, name, dev);
2229 if (rc) {
2230 free_netdev(dev);
2231 return ERR_PTR(rc);
2232 }
2233
2234 /*
2235 * Upon success the caller must ensure ipoib_intf_free is called or
2236 * register_netdevice succeed'd and priv_destructor is set to
2237 * ipoib_intf_free.
2238 */
2239 return dev;
2240 }
2241
2242 void ipoib_intf_free(struct net_device *dev)
2243 {
2244 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2245 struct rdma_netdev *rn = netdev_priv(dev);
2246
2247 dev->priv_destructor = priv->next_priv_destructor;
2248 if (dev->priv_destructor)
2249 dev->priv_destructor(dev);
2250
2251 /*
2252 * There are some error flows around register_netdev failing that may
2253 * attempt to call priv_destructor twice, prevent that from happening.
2254 */
2255 dev->priv_destructor = NULL;
2256
2257 /* unregister/destroy is very complicated. Make bugs more obvious. */
2258 rn->clnt_priv = NULL;
2259
2260 kfree(priv);
2261 }
2262
2263 static ssize_t show_pkey(struct device *dev,
2264 struct device_attribute *attr, char *buf)
2265 {
2266 struct net_device *ndev = to_net_dev(dev);
2267 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2268
2269 return sysfs_emit(buf, "0x%04x\n", priv->pkey);
2270 }
2271 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
2272
2273 static ssize_t show_umcast(struct device *dev,
2274 struct device_attribute *attr, char *buf)
2275 {
2276 struct net_device *ndev = to_net_dev(dev);
2277 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2278
2279 return sysfs_emit(buf, "%d\n",
2280 test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
2281 }
2282
2283 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
2284 {
2285 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2286
2287 if (umcast_val > 0) {
2288 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2289 ipoib_warn(priv, "ignoring multicast groups joined directly "
2290 "by userspace\n");
2291 } else
2292 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2293 }
2294
2295 static ssize_t set_umcast(struct device *dev,
2296 struct device_attribute *attr,
2297 const char *buf, size_t count)
2298 {
2299 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
2300
2301 ipoib_set_umcast(to_net_dev(dev), umcast_val);
2302
2303 return count;
2304 }
2305 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
2306
2307 int ipoib_add_umcast_attr(struct net_device *dev)
2308 {
2309 return device_create_file(&dev->dev, &dev_attr_umcast);
2310 }
2311
2312 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
2313 {
2314 struct ipoib_dev_priv *child_priv;
2315 struct net_device *netdev = priv->dev;
2316
2317 netif_addr_lock_bh(netdev);
2318
2319 memcpy(&priv->local_gid.global.interface_id,
2320 &gid->global.interface_id,
2321 sizeof(gid->global.interface_id));
2322 memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
2323 clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2324
2325 netif_addr_unlock_bh(netdev);
2326
2327 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
2328 down_read(&priv->vlan_rwsem);
2329 list_for_each_entry(child_priv, &priv->child_intfs, list)
2330 set_base_guid(child_priv, gid);
2331 up_read(&priv->vlan_rwsem);
2332 }
2333 }
2334
2335 static int ipoib_check_lladdr(struct net_device *dev,
2336 struct sockaddr_storage *ss)
2337 {
2338 union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
2339 int ret = 0;
2340
2341 netif_addr_lock_bh(dev);
2342
2343 /* Make sure the QPN, reserved and subnet prefix match the current
2344 * lladdr, it also makes sure the lladdr is unicast.
2345 */
2346 if (memcmp(dev->dev_addr, ss->__data,
2347 4 + sizeof(gid->global.subnet_prefix)) ||
2348 gid->global.interface_id == 0)
2349 ret = -EINVAL;
2350
2351 netif_addr_unlock_bh(dev);
2352
2353 return ret;
2354 }
2355
2356 static int ipoib_set_mac(struct net_device *dev, void *addr)
2357 {
2358 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2359 struct sockaddr_storage *ss = addr;
2360 int ret;
2361
2362 if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
2363 return -EBUSY;
2364
2365 ret = ipoib_check_lladdr(dev, ss);
2366 if (ret)
2367 return ret;
2368
2369 set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
2370
2371 queue_work(ipoib_workqueue, &priv->flush_light);
2372
2373 return 0;
2374 }
2375
2376 static ssize_t create_child(struct device *dev,
2377 struct device_attribute *attr,
2378 const char *buf, size_t count)
2379 {
2380 int pkey;
2381 int ret;
2382
2383 if (sscanf(buf, "%i", &pkey) != 1)
2384 return -EINVAL;
2385
2386 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
2387 return -EINVAL;
2388
2389 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
2390
2391 return ret ? ret : count;
2392 }
2393 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
2394
2395 static ssize_t delete_child(struct device *dev,
2396 struct device_attribute *attr,
2397 const char *buf, size_t count)
2398 {
2399 int pkey;
2400 int ret;
2401
2402 if (sscanf(buf, "%i", &pkey) != 1)
2403 return -EINVAL;
2404
2405 if (pkey < 0 || pkey > 0xffff)
2406 return -EINVAL;
2407
2408 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
2409
2410 return ret ? ret : count;
2411
2412 }
2413 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
2414
2415 int ipoib_add_pkey_attr(struct net_device *dev)
2416 {
2417 return device_create_file(&dev->dev, &dev_attr_pkey);
2418 }
2419
2420 /*
2421 * We erroneously exposed the iface's port number in the dev_id
2422 * sysfs field long after dev_port was introduced for that purpose[1],
2423 * and we need to stop everyone from relying on that.
2424 * Let's overload the shower routine for the dev_id file here
2425 * to gently bring the issue up.
2426 *
2427 * [1] https://www.spinics.net/lists/netdev/msg272123.html
2428 */
2429 static ssize_t dev_id_show(struct device *dev,
2430 struct device_attribute *attr, char *buf)
2431 {
2432 struct net_device *ndev = to_net_dev(dev);
2433
2434 /*
2435 * ndev->dev_port will be equal to 0 in old kernel prior to commit
2436 * 9b8b2a323008 ("IB/ipoib: Use dev_port to expose network interface
2437 * port numbers") Zero was chosen as special case for user space
2438 * applications to fallback and query dev_id to check if it has
2439 * different value or not.
2440 *
2441 * Don't print warning in such scenario.
2442 *
2443 * https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L358
2444 */
2445 if (ndev->dev_port && ndev->dev_id == ndev->dev_port)
2446 netdev_info_once(ndev,
2447 "\"%s\" wants to know my dev_id. Should it look at dev_port instead? See Documentation/ABI/testing/sysfs-class-net for more info.\n",
2448 current->comm);
2449
2450 return sysfs_emit(buf, "%#x\n", ndev->dev_id);
2451 }
2452 static DEVICE_ATTR_RO(dev_id);
2453
2454 static int ipoib_intercept_dev_id_attr(struct net_device *dev)
2455 {
2456 device_remove_file(&dev->dev, &dev_attr_dev_id);
2457 return device_create_file(&dev->dev, &dev_attr_dev_id);
2458 }
2459
2460 static struct net_device *ipoib_add_port(const char *format,
2461 struct ib_device *hca, u8 port)
2462 {
2463 struct rtnl_link_ops *ops = ipoib_get_link_ops();
2464 struct rdma_netdev_alloc_params params;
2465 struct ipoib_dev_priv *priv;
2466 struct net_device *ndev;
2467 int result;
2468
2469 ndev = ipoib_intf_alloc(hca, port, format);
2470 if (IS_ERR(ndev)) {
2471 pr_warn("%s, %d: ipoib_intf_alloc failed %ld\n", hca->name, port,
2472 PTR_ERR(ndev));
2473 return ndev;
2474 }
2475 priv = ipoib_priv(ndev);
2476
2477 INIT_IB_EVENT_HANDLER(&priv->event_handler,
2478 priv->ca, ipoib_event);
2479 ib_register_event_handler(&priv->event_handler);
2480
2481 /* call event handler to ensure pkey in sync */
2482 queue_work(ipoib_workqueue, &priv->flush_heavy);
2483
2484 ndev->rtnl_link_ops = ipoib_get_link_ops();
2485
2486 result = register_netdev(ndev);
2487 if (result) {
2488 pr_warn("%s: couldn't register ipoib port %d; error %d\n",
2489 hca->name, port, result);
2490
2491 ipoib_parent_unregister_pre(ndev);
2492 ipoib_intf_free(ndev);
2493 free_netdev(ndev);
2494
2495 return ERR_PTR(result);
2496 }
2497
2498 if (hca->ops.rdma_netdev_get_params) {
2499 int rc = hca->ops.rdma_netdev_get_params(hca, port,
2500 RDMA_NETDEV_IPOIB,
2501 &params);
2502
2503 if (!rc && ops->priv_size < params.sizeof_priv)
2504 ops->priv_size = params.sizeof_priv;
2505 }
2506 /*
2507 * We cannot set priv_destructor before register_netdev because we
2508 * need priv to be always valid during the error flow to execute
2509 * ipoib_parent_unregister_pre(). Instead handle it manually and only
2510 * enter priv_destructor mode once we are completely registered.
2511 */
2512 ndev->priv_destructor = ipoib_intf_free;
2513
2514 if (ipoib_intercept_dev_id_attr(ndev))
2515 goto sysfs_failed;
2516 if (ipoib_cm_add_mode_attr(ndev))
2517 goto sysfs_failed;
2518 if (ipoib_add_pkey_attr(ndev))
2519 goto sysfs_failed;
2520 if (ipoib_add_umcast_attr(ndev))
2521 goto sysfs_failed;
2522 if (device_create_file(&ndev->dev, &dev_attr_create_child))
2523 goto sysfs_failed;
2524 if (device_create_file(&ndev->dev, &dev_attr_delete_child))
2525 goto sysfs_failed;
2526
2527 return ndev;
2528
2529 sysfs_failed:
2530 ipoib_parent_unregister_pre(ndev);
2531 unregister_netdev(ndev);
2532 return ERR_PTR(-ENOMEM);
2533 }
2534
2535 static int ipoib_add_one(struct ib_device *device)
2536 {
2537 struct list_head *dev_list;
2538 struct net_device *dev;
2539 struct ipoib_dev_priv *priv;
2540 unsigned int p;
2541 int count = 0;
2542
2543 dev_list = kmalloc(sizeof(*dev_list), GFP_KERNEL);
2544 if (!dev_list)
2545 return -ENOMEM;
2546
2547 INIT_LIST_HEAD(dev_list);
2548
2549 rdma_for_each_port (device, p) {
2550 if (!rdma_protocol_ib(device, p))
2551 continue;
2552 dev = ipoib_add_port("ib%d", device, p);
2553 if (!IS_ERR(dev)) {
2554 priv = ipoib_priv(dev);
2555 list_add_tail(&priv->list, dev_list);
2556 count++;
2557 }
2558 }
2559
2560 if (!count) {
2561 kfree(dev_list);
2562 return -EOPNOTSUPP;
2563 }
2564
2565 ib_set_client_data(device, &ipoib_client, dev_list);
2566 return 0;
2567 }
2568
2569 static void ipoib_remove_one(struct ib_device *device, void *client_data)
2570 {
2571 struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv;
2572 struct list_head *dev_list = client_data;
2573
2574 list_for_each_entry_safe(priv, tmp, dev_list, list) {
2575 LIST_HEAD(head);
2576 ipoib_parent_unregister_pre(priv->dev);
2577
2578 rtnl_lock();
2579
2580 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs,
2581 list)
2582 unregister_netdevice_queue(cpriv->dev, &head);
2583 unregister_netdevice_queue(priv->dev, &head);
2584 unregister_netdevice_many(&head);
2585
2586 rtnl_unlock();
2587 }
2588
2589 kfree(dev_list);
2590 }
2591
2592 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2593 static struct notifier_block ipoib_netdev_notifier = {
2594 .notifier_call = ipoib_netdev_event,
2595 };
2596 #endif
2597
2598 static int __init ipoib_init_module(void)
2599 {
2600 int ret;
2601
2602 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2603 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2604 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2605
2606 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2607 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2608 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2609 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2610 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2611 ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0);
2612 #endif
2613
2614 /*
2615 * When copying small received packets, we only copy from the
2616 * linear data part of the SKB, so we rely on this condition.
2617 */
2618 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2619
2620 ipoib_register_debugfs();
2621
2622 /*
2623 * We create a global workqueue here that is used for all flush
2624 * operations. However, if you attempt to flush a workqueue
2625 * from a task on that same workqueue, it deadlocks the system.
2626 * We want to be able to flush the tasks associated with a
2627 * specific net device, so we also create a workqueue for each
2628 * netdevice. We queue up the tasks for that device only on
2629 * its private workqueue, and we only queue up flush events
2630 * on our global flush workqueue. This avoids the deadlocks.
2631 */
2632 ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 0);
2633 if (!ipoib_workqueue) {
2634 ret = -ENOMEM;
2635 goto err_fs;
2636 }
2637
2638 ib_sa_register_client(&ipoib_sa_client);
2639
2640 ret = ib_register_client(&ipoib_client);
2641 if (ret)
2642 goto err_sa;
2643
2644 ret = ipoib_netlink_init();
2645 if (ret)
2646 goto err_client;
2647
2648 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2649 register_netdevice_notifier(&ipoib_netdev_notifier);
2650 #endif
2651 return 0;
2652
2653 err_client:
2654 ib_unregister_client(&ipoib_client);
2655
2656 err_sa:
2657 ib_sa_unregister_client(&ipoib_sa_client);
2658 destroy_workqueue(ipoib_workqueue);
2659
2660 err_fs:
2661 ipoib_unregister_debugfs();
2662
2663 return ret;
2664 }
2665
2666 static void __exit ipoib_cleanup_module(void)
2667 {
2668 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2669 unregister_netdevice_notifier(&ipoib_netdev_notifier);
2670 #endif
2671 ipoib_netlink_fini();
2672 ib_unregister_client(&ipoib_client);
2673 ib_sa_unregister_client(&ipoib_sa_client);
2674 ipoib_unregister_debugfs();
2675 destroy_workqueue(ipoib_workqueue);
2676 }
2677
2678 module_init(ipoib_init_module);
2679 module_exit(ipoib_cleanup_module);
Linux with added FPC-III support