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UBUNTU: Ubuntu-5.15.0-39.42
[mirror_ubuntu-jammy-kernel.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35 #include "ipoib.h"
36
37 #include <linux/module.h>
38
39 #include <linux/init.h>
40 #include <linux/slab.h>
41 #include <linux/kernel.h>
42 #include <linux/vmalloc.h>
43
44 #include <linux/if_arp.h> /* For ARPHRD_xxx */
45
46 #include <linux/ip.h>
47 #include <linux/in.h>
48
49 #include <linux/jhash.h>
50 #include <net/arp.h>
51 #include <net/addrconf.h>
52 #include <linux/inetdevice.h>
53 #include <rdma/ib_cache.h>
54
55 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, u32 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 if (ipoib_ib_dev_open(dev)) {
145 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
146 return 0;
147 goto err_disable;
148 }
149
150 ipoib_ib_dev_up(dev);
151
152 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
153 struct ipoib_dev_priv *cpriv;
154
155 /* Bring up any child interfaces too */
156 down_read(&priv->vlan_rwsem);
157 list_for_each_entry(cpriv, &priv->child_intfs, list) {
158 int flags;
159
160 flags = cpriv->dev->flags;
161 if (flags & IFF_UP)
162 continue;
163
164 dev_change_flags(cpriv->dev, flags | IFF_UP, NULL);
165 }
166 up_read(&priv->vlan_rwsem);
167 } else if (priv->parent) {
168 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
169
170 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &ppriv->flags))
171 ipoib_dbg(priv, "parent device %s is not up, so child device may be not functioning.\n",
172 ppriv->dev->name);
173 }
174 netif_start_queue(dev);
175
176 return 0;
177
178 err_disable:
179 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
180
181 return -EINVAL;
182 }
183
184 static int ipoib_stop(struct net_device *dev)
185 {
186 struct ipoib_dev_priv *priv = ipoib_priv(dev);
187
188 ipoib_dbg(priv, "stopping interface\n");
189
190 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
191
192 netif_stop_queue(dev);
193
194 ipoib_ib_dev_down(dev);
195 ipoib_ib_dev_stop(dev);
196
197 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
198 struct ipoib_dev_priv *cpriv;
199
200 /* Bring down any child interfaces too */
201 down_read(&priv->vlan_rwsem);
202 list_for_each_entry(cpriv, &priv->child_intfs, list) {
203 int flags;
204
205 flags = cpriv->dev->flags;
206 if (!(flags & IFF_UP))
207 continue;
208
209 dev_change_flags(cpriv->dev, flags & ~IFF_UP, NULL);
210 }
211 up_read(&priv->vlan_rwsem);
212 }
213
214 return 0;
215 }
216
217 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
218 {
219 struct ipoib_dev_priv *priv = ipoib_priv(dev);
220
221 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
222 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
223
224 return features;
225 }
226
227 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
228 {
229 struct ipoib_dev_priv *priv = ipoib_priv(dev);
230 int ret = 0;
231
232 /* dev->mtu > 2K ==> connected mode */
233 if (ipoib_cm_admin_enabled(dev)) {
234 if (new_mtu > ipoib_cm_max_mtu(dev))
235 return -EINVAL;
236
237 if (new_mtu > priv->mcast_mtu)
238 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
239 priv->mcast_mtu);
240
241 dev->mtu = new_mtu;
242 return 0;
243 }
244
245 if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) ||
246 new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
247 return -EINVAL;
248
249 priv->admin_mtu = new_mtu;
250
251 if (priv->mcast_mtu < priv->admin_mtu)
252 ipoib_dbg(priv, "MTU must be smaller than the underlying "
253 "link layer MTU - 4 (%u)\n", priv->mcast_mtu);
254
255 new_mtu = min(priv->mcast_mtu, priv->admin_mtu);
256
257 if (priv->rn_ops->ndo_change_mtu) {
258 bool carrier_status = netif_carrier_ok(dev);
259
260 netif_carrier_off(dev);
261
262 /* notify lower level on the real mtu */
263 ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu);
264
265 if (carrier_status)
266 netif_carrier_on(dev);
267 } else {
268 dev->mtu = new_mtu;
269 }
270
271 return ret;
272 }
273
274 static void ipoib_get_stats(struct net_device *dev,
275 struct rtnl_link_stats64 *stats)
276 {
277 struct ipoib_dev_priv *priv = ipoib_priv(dev);
278
279 if (priv->rn_ops->ndo_get_stats64)
280 priv->rn_ops->ndo_get_stats64(dev, stats);
281 else
282 netdev_stats_to_stats64(stats, &dev->stats);
283 }
284
285 /* Called with an RCU read lock taken */
286 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
287 struct net_device *dev)
288 {
289 struct net *net = dev_net(dev);
290 struct in_device *in_dev;
291 struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
292 struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
293 __be32 ret_addr;
294
295 switch (addr->sa_family) {
296 case AF_INET:
297 in_dev = in_dev_get(dev);
298 if (!in_dev)
299 return false;
300
301 ret_addr = inet_confirm_addr(net, in_dev, 0,
302 addr_in->sin_addr.s_addr,
303 RT_SCOPE_HOST);
304 in_dev_put(in_dev);
305 if (ret_addr)
306 return true;
307
308 break;
309 case AF_INET6:
310 if (IS_ENABLED(CONFIG_IPV6) &&
311 ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
312 return true;
313
314 break;
315 }
316 return false;
317 }
318
319 /*
320 * Find the master net_device on top of the given net_device.
321 * @dev: base IPoIB net_device
322 *
323 * Returns the master net_device with a reference held, or the same net_device
324 * if no master exists.
325 */
326 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
327 {
328 struct net_device *master;
329
330 rcu_read_lock();
331 master = netdev_master_upper_dev_get_rcu(dev);
332 if (master)
333 dev_hold(master);
334 rcu_read_unlock();
335
336 if (master)
337 return master;
338
339 dev_hold(dev);
340 return dev;
341 }
342
343 struct ipoib_walk_data {
344 const struct sockaddr *addr;
345 struct net_device *result;
346 };
347
348 static int ipoib_upper_walk(struct net_device *upper,
349 struct netdev_nested_priv *priv)
350 {
351 struct ipoib_walk_data *data = (struct ipoib_walk_data *)priv->data;
352 int ret = 0;
353
354 if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) {
355 dev_hold(upper);
356 data->result = upper;
357 ret = 1;
358 }
359
360 return ret;
361 }
362
363 /**
364 * ipoib_get_net_dev_match_addr - Find a net_device matching
365 * the given address, which is an upper device of the given net_device.
366 *
367 * @addr: IP address to look for.
368 * @dev: base IPoIB net_device
369 *
370 * If found, returns the net_device with a reference held. Otherwise return
371 * NULL.
372 */
373 static struct net_device *ipoib_get_net_dev_match_addr(
374 const struct sockaddr *addr, struct net_device *dev)
375 {
376 struct netdev_nested_priv priv;
377 struct ipoib_walk_data data = {
378 .addr = addr,
379 };
380
381 priv.data = (void *)&data;
382 rcu_read_lock();
383 if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
384 dev_hold(dev);
385 data.result = dev;
386 goto out;
387 }
388
389 netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &priv);
390 out:
391 rcu_read_unlock();
392 return data.result;
393 }
394
395 /* returns the number of IPoIB netdevs on top a given ipoib device matching a
396 * pkey_index and address, if one exists.
397 *
398 * @found_net_dev: contains a matching net_device if the return value >= 1,
399 * with a reference held. */
400 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
401 const union ib_gid *gid,
402 u16 pkey_index,
403 const struct sockaddr *addr,
404 int nesting,
405 struct net_device **found_net_dev)
406 {
407 struct ipoib_dev_priv *child_priv;
408 struct net_device *net_dev = NULL;
409 int matches = 0;
410
411 if (priv->pkey_index == pkey_index &&
412 (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
413 if (!addr) {
414 net_dev = ipoib_get_master_net_dev(priv->dev);
415 } else {
416 /* Verify the net_device matches the IP address, as
417 * IPoIB child devices currently share a GID. */
418 net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
419 }
420 if (net_dev) {
421 if (!*found_net_dev)
422 *found_net_dev = net_dev;
423 else
424 dev_put(net_dev);
425 ++matches;
426 }
427 }
428
429 /* Check child interfaces */
430 down_read_nested(&priv->vlan_rwsem, nesting);
431 list_for_each_entry(child_priv, &priv->child_intfs, list) {
432 matches += ipoib_match_gid_pkey_addr(child_priv, gid,
433 pkey_index, addr,
434 nesting + 1,
435 found_net_dev);
436 if (matches > 1)
437 break;
438 }
439 up_read(&priv->vlan_rwsem);
440
441 return matches;
442 }
443
444 /* Returns the number of matching net_devs found (between 0 and 2). Also
445 * return the matching net_device in the @net_dev parameter, holding a
446 * reference to the net_device, if the number of matches >= 1 */
447 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u32 port,
448 u16 pkey_index,
449 const union ib_gid *gid,
450 const struct sockaddr *addr,
451 struct net_device **net_dev)
452 {
453 struct ipoib_dev_priv *priv;
454 int matches = 0;
455
456 *net_dev = NULL;
457
458 list_for_each_entry(priv, dev_list, list) {
459 if (priv->port != port)
460 continue;
461
462 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
463 addr, 0, net_dev);
464 if (matches > 1)
465 break;
466 }
467
468 return matches;
469 }
470
471 static struct net_device *ipoib_get_net_dev_by_params(
472 struct ib_device *dev, u32 port, u16 pkey,
473 const union ib_gid *gid, const struct sockaddr *addr,
474 void *client_data)
475 {
476 struct net_device *net_dev;
477 struct list_head *dev_list = client_data;
478 u16 pkey_index;
479 int matches;
480 int ret;
481
482 if (!rdma_protocol_ib(dev, port))
483 return NULL;
484
485 ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
486 if (ret)
487 return NULL;
488
489 /* See if we can find a unique device matching the L2 parameters */
490 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
491 gid, NULL, &net_dev);
492
493 switch (matches) {
494 case 0:
495 return NULL;
496 case 1:
497 return net_dev;
498 }
499
500 dev_put(net_dev);
501
502 /* Couldn't find a unique device with L2 parameters only. Use L3
503 * address to uniquely match the net device */
504 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
505 gid, addr, &net_dev);
506 switch (matches) {
507 case 0:
508 return NULL;
509 default:
510 dev_warn_ratelimited(&dev->dev,
511 "duplicate IP address detected\n");
512 fallthrough;
513 case 1:
514 return net_dev;
515 }
516 }
517
518 int ipoib_set_mode(struct net_device *dev, const char *buf)
519 {
520 struct ipoib_dev_priv *priv = ipoib_priv(dev);
521
522 if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
523 !strcmp(buf, "connected\n")) ||
524 (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
525 !strcmp(buf, "datagram\n"))) {
526 return 0;
527 }
528
529 /* flush paths if we switch modes so that connections are restarted */
530 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
531 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
532 ipoib_warn(priv, "enabling connected mode "
533 "will cause multicast packet drops\n");
534 netdev_update_features(dev);
535 dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
536 netif_set_real_num_tx_queues(dev, 1);
537 rtnl_unlock();
538 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
539
540 ipoib_flush_paths(dev);
541 return (!rtnl_trylock()) ? -EBUSY : 0;
542 }
543
544 if (!strcmp(buf, "datagram\n")) {
545 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
546 netdev_update_features(dev);
547 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
548 netif_set_real_num_tx_queues(dev, dev->num_tx_queues);
549 rtnl_unlock();
550 ipoib_flush_paths(dev);
551 return (!rtnl_trylock()) ? -EBUSY : 0;
552 }
553
554 return -EINVAL;
555 }
556
557 struct ipoib_path *__path_find(struct net_device *dev, void *gid)
558 {
559 struct ipoib_dev_priv *priv = ipoib_priv(dev);
560 struct rb_node *n = priv->path_tree.rb_node;
561 struct ipoib_path *path;
562 int ret;
563
564 while (n) {
565 path = rb_entry(n, struct ipoib_path, rb_node);
566
567 ret = memcmp(gid, path->pathrec.dgid.raw,
568 sizeof (union ib_gid));
569
570 if (ret < 0)
571 n = n->rb_left;
572 else if (ret > 0)
573 n = n->rb_right;
574 else
575 return path;
576 }
577
578 return NULL;
579 }
580
581 static int __path_add(struct net_device *dev, struct ipoib_path *path)
582 {
583 struct ipoib_dev_priv *priv = ipoib_priv(dev);
584 struct rb_node **n = &priv->path_tree.rb_node;
585 struct rb_node *pn = NULL;
586 struct ipoib_path *tpath;
587 int ret;
588
589 while (*n) {
590 pn = *n;
591 tpath = rb_entry(pn, struct ipoib_path, rb_node);
592
593 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
594 sizeof (union ib_gid));
595 if (ret < 0)
596 n = &pn->rb_left;
597 else if (ret > 0)
598 n = &pn->rb_right;
599 else
600 return -EEXIST;
601 }
602
603 rb_link_node(&path->rb_node, pn, n);
604 rb_insert_color(&path->rb_node, &priv->path_tree);
605
606 list_add_tail(&path->list, &priv->path_list);
607
608 return 0;
609 }
610
611 static void path_free(struct net_device *dev, struct ipoib_path *path)
612 {
613 struct sk_buff *skb;
614
615 while ((skb = __skb_dequeue(&path->queue)))
616 dev_kfree_skb_irq(skb);
617
618 ipoib_dbg(ipoib_priv(dev), "%s\n", __func__);
619
620 /* remove all neigh connected to this path */
621 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
622
623 if (path->ah)
624 ipoib_put_ah(path->ah);
625
626 kfree(path);
627 }
628
629 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
630
631 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
632 {
633 struct ipoib_path_iter *iter;
634
635 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
636 if (!iter)
637 return NULL;
638
639 iter->dev = dev;
640 memset(iter->path.pathrec.dgid.raw, 0, 16);
641
642 if (ipoib_path_iter_next(iter)) {
643 kfree(iter);
644 return NULL;
645 }
646
647 return iter;
648 }
649
650 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
651 {
652 struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
653 struct rb_node *n;
654 struct ipoib_path *path;
655 int ret = 1;
656
657 spin_lock_irq(&priv->lock);
658
659 n = rb_first(&priv->path_tree);
660
661 while (n) {
662 path = rb_entry(n, struct ipoib_path, rb_node);
663
664 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
665 sizeof (union ib_gid)) < 0) {
666 iter->path = *path;
667 ret = 0;
668 break;
669 }
670
671 n = rb_next(n);
672 }
673
674 spin_unlock_irq(&priv->lock);
675
676 return ret;
677 }
678
679 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
680 struct ipoib_path *path)
681 {
682 *path = iter->path;
683 }
684
685 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
686
687 void ipoib_mark_paths_invalid(struct net_device *dev)
688 {
689 struct ipoib_dev_priv *priv = ipoib_priv(dev);
690 struct ipoib_path *path, *tp;
691
692 spin_lock_irq(&priv->lock);
693
694 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
695 ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n",
696 be32_to_cpu(sa_path_get_dlid(&path->pathrec)),
697 path->pathrec.dgid.raw);
698 if (path->ah)
699 path->ah->valid = 0;
700 }
701
702 spin_unlock_irq(&priv->lock);
703 }
704
705 static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
706 {
707 struct ipoib_pseudo_header *phdr;
708
709 phdr = skb_push(skb, sizeof(*phdr));
710 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
711 }
712
713 void ipoib_flush_paths(struct net_device *dev)
714 {
715 struct ipoib_dev_priv *priv = ipoib_priv(dev);
716 struct ipoib_path *path, *tp;
717 LIST_HEAD(remove_list);
718 unsigned long flags;
719
720 netif_tx_lock_bh(dev);
721 spin_lock_irqsave(&priv->lock, flags);
722
723 list_splice_init(&priv->path_list, &remove_list);
724
725 list_for_each_entry(path, &remove_list, list)
726 rb_erase(&path->rb_node, &priv->path_tree);
727
728 list_for_each_entry_safe(path, tp, &remove_list, list) {
729 if (path->query)
730 ib_sa_cancel_query(path->query_id, path->query);
731 spin_unlock_irqrestore(&priv->lock, flags);
732 netif_tx_unlock_bh(dev);
733 wait_for_completion(&path->done);
734 path_free(dev, path);
735 netif_tx_lock_bh(dev);
736 spin_lock_irqsave(&priv->lock, flags);
737 }
738
739 spin_unlock_irqrestore(&priv->lock, flags);
740 netif_tx_unlock_bh(dev);
741 }
742
743 static void path_rec_completion(int status,
744 struct sa_path_rec *pathrec,
745 void *path_ptr)
746 {
747 struct ipoib_path *path = path_ptr;
748 struct net_device *dev = path->dev;
749 struct ipoib_dev_priv *priv = ipoib_priv(dev);
750 struct ipoib_ah *ah = NULL;
751 struct ipoib_ah *old_ah = NULL;
752 struct ipoib_neigh *neigh, *tn;
753 struct sk_buff_head skqueue;
754 struct sk_buff *skb;
755 unsigned long flags;
756
757 if (!status)
758 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
759 be32_to_cpu(sa_path_get_dlid(pathrec)),
760 pathrec->dgid.raw);
761 else
762 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
763 status, path->pathrec.dgid.raw);
764
765 skb_queue_head_init(&skqueue);
766
767 if (!status) {
768 struct rdma_ah_attr av;
769
770 if (!ib_init_ah_attr_from_path(priv->ca, priv->port,
771 pathrec, &av, NULL)) {
772 ah = ipoib_create_ah(dev, priv->pd, &av);
773 rdma_destroy_ah_attr(&av);
774 }
775 }
776
777 spin_lock_irqsave(&priv->lock, flags);
778
779 if (!IS_ERR_OR_NULL(ah)) {
780 /*
781 * pathrec.dgid is used as the database key from the LLADDR,
782 * it must remain unchanged even if the SA returns a different
783 * GID to use in the AH.
784 */
785 if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw,
786 sizeof(union ib_gid))) {
787 ipoib_dbg(
788 priv,
789 "%s got PathRec for gid %pI6 while asked for %pI6\n",
790 dev->name, pathrec->dgid.raw,
791 path->pathrec.dgid.raw);
792 memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw,
793 sizeof(union ib_gid));
794 }
795
796 path->pathrec = *pathrec;
797
798 old_ah = path->ah;
799 path->ah = ah;
800
801 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
802 ah, be32_to_cpu(sa_path_get_dlid(pathrec)),
803 pathrec->sl);
804
805 while ((skb = __skb_dequeue(&path->queue)))
806 __skb_queue_tail(&skqueue, skb);
807
808 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
809 if (neigh->ah) {
810 WARN_ON(neigh->ah != old_ah);
811 /*
812 * Dropping the ah reference inside
813 * priv->lock is safe here, because we
814 * will hold one more reference from
815 * the original value of path->ah (ie
816 * old_ah).
817 */
818 ipoib_put_ah(neigh->ah);
819 }
820 kref_get(&path->ah->ref);
821 neigh->ah = path->ah;
822
823 if (ipoib_cm_enabled(dev, neigh->daddr)) {
824 if (!ipoib_cm_get(neigh))
825 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
826 path,
827 neigh));
828 if (!ipoib_cm_get(neigh)) {
829 ipoib_neigh_free(neigh);
830 continue;
831 }
832 }
833
834 while ((skb = __skb_dequeue(&neigh->queue)))
835 __skb_queue_tail(&skqueue, skb);
836 }
837 path->ah->valid = 1;
838 }
839
840 path->query = NULL;
841 complete(&path->done);
842
843 spin_unlock_irqrestore(&priv->lock, flags);
844
845 if (IS_ERR_OR_NULL(ah))
846 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
847
848 if (old_ah)
849 ipoib_put_ah(old_ah);
850
851 while ((skb = __skb_dequeue(&skqueue))) {
852 int ret;
853 skb->dev = dev;
854 ret = dev_queue_xmit(skb);
855 if (ret)
856 ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n",
857 __func__, ret);
858 }
859 }
860
861 static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path,
862 void *gid)
863 {
864 path->dev = priv->dev;
865
866 if (rdma_cap_opa_ah(priv->ca, priv->port))
867 path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA;
868 else
869 path->pathrec.rec_type = SA_PATH_REC_TYPE_IB;
870
871 memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid));
872 path->pathrec.sgid = priv->local_gid;
873 path->pathrec.pkey = cpu_to_be16(priv->pkey);
874 path->pathrec.numb_path = 1;
875 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
876 }
877
878 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
879 {
880 struct ipoib_dev_priv *priv = ipoib_priv(dev);
881 struct ipoib_path *path;
882
883 if (!priv->broadcast)
884 return NULL;
885
886 path = kzalloc(sizeof(*path), GFP_ATOMIC);
887 if (!path)
888 return NULL;
889
890 skb_queue_head_init(&path->queue);
891
892 INIT_LIST_HEAD(&path->neigh_list);
893
894 init_path_rec(priv, path, gid);
895
896 return path;
897 }
898
899 static int path_rec_start(struct net_device *dev,
900 struct ipoib_path *path)
901 {
902 struct ipoib_dev_priv *priv = ipoib_priv(dev);
903
904 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
905 path->pathrec.dgid.raw);
906
907 init_completion(&path->done);
908
909 path->query_id =
910 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
911 &path->pathrec,
912 IB_SA_PATH_REC_DGID |
913 IB_SA_PATH_REC_SGID |
914 IB_SA_PATH_REC_NUMB_PATH |
915 IB_SA_PATH_REC_TRAFFIC_CLASS |
916 IB_SA_PATH_REC_PKEY,
917 1000, GFP_ATOMIC,
918 path_rec_completion,
919 path, &path->query);
920 if (path->query_id < 0) {
921 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
922 path->query = NULL;
923 complete(&path->done);
924 return path->query_id;
925 }
926
927 return 0;
928 }
929
930 static void neigh_refresh_path(struct ipoib_neigh *neigh, u8 *daddr,
931 struct net_device *dev)
932 {
933 struct ipoib_dev_priv *priv = ipoib_priv(dev);
934 struct ipoib_path *path;
935 unsigned long flags;
936
937 spin_lock_irqsave(&priv->lock, flags);
938
939 path = __path_find(dev, daddr + 4);
940 if (!path)
941 goto out;
942 if (!path->query)
943 path_rec_start(dev, path);
944 out:
945 spin_unlock_irqrestore(&priv->lock, flags);
946 }
947
948 static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr,
949 struct net_device *dev)
950 {
951 struct ipoib_dev_priv *priv = ipoib_priv(dev);
952 struct rdma_netdev *rn = netdev_priv(dev);
953 struct ipoib_path *path;
954 struct ipoib_neigh *neigh;
955 unsigned long flags;
956
957 spin_lock_irqsave(&priv->lock, flags);
958 neigh = ipoib_neigh_alloc(daddr, dev);
959 if (!neigh) {
960 spin_unlock_irqrestore(&priv->lock, flags);
961 ++dev->stats.tx_dropped;
962 dev_kfree_skb_any(skb);
963 return NULL;
964 }
965
966 /* To avoid race condition, make sure that the
967 * neigh will be added only once.
968 */
969 if (unlikely(!list_empty(&neigh->list))) {
970 spin_unlock_irqrestore(&priv->lock, flags);
971 return neigh;
972 }
973
974 path = __path_find(dev, daddr + 4);
975 if (!path) {
976 path = path_rec_create(dev, daddr + 4);
977 if (!path)
978 goto err_path;
979
980 __path_add(dev, path);
981 }
982
983 list_add_tail(&neigh->list, &path->neigh_list);
984
985 if (path->ah && path->ah->valid) {
986 kref_get(&path->ah->ref);
987 neigh->ah = path->ah;
988
989 if (ipoib_cm_enabled(dev, neigh->daddr)) {
990 if (!ipoib_cm_get(neigh))
991 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
992 if (!ipoib_cm_get(neigh)) {
993 ipoib_neigh_free(neigh);
994 goto err_drop;
995 }
996 if (skb_queue_len(&neigh->queue) <
997 IPOIB_MAX_PATH_REC_QUEUE) {
998 push_pseudo_header(skb, neigh->daddr);
999 __skb_queue_tail(&neigh->queue, skb);
1000 } else {
1001 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
1002 skb_queue_len(&neigh->queue));
1003 goto err_drop;
1004 }
1005 } else {
1006 spin_unlock_irqrestore(&priv->lock, flags);
1007 path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1008 IPOIB_QPN(daddr));
1009 ipoib_neigh_put(neigh);
1010 return NULL;
1011 }
1012 } else {
1013 neigh->ah = NULL;
1014
1015 if (!path->query && path_rec_start(dev, path))
1016 goto err_path;
1017 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1018 push_pseudo_header(skb, neigh->daddr);
1019 __skb_queue_tail(&neigh->queue, skb);
1020 } else {
1021 goto err_drop;
1022 }
1023 }
1024
1025 spin_unlock_irqrestore(&priv->lock, flags);
1026 ipoib_neigh_put(neigh);
1027 return NULL;
1028
1029 err_path:
1030 ipoib_neigh_free(neigh);
1031 err_drop:
1032 ++dev->stats.tx_dropped;
1033 dev_kfree_skb_any(skb);
1034
1035 spin_unlock_irqrestore(&priv->lock, flags);
1036 ipoib_neigh_put(neigh);
1037
1038 return NULL;
1039 }
1040
1041 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
1042 struct ipoib_pseudo_header *phdr)
1043 {
1044 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1045 struct rdma_netdev *rn = netdev_priv(dev);
1046 struct ipoib_path *path;
1047 unsigned long flags;
1048
1049 spin_lock_irqsave(&priv->lock, flags);
1050
1051 /* no broadcast means that all paths are (going to be) not valid */
1052 if (!priv->broadcast)
1053 goto drop_and_unlock;
1054
1055 path = __path_find(dev, phdr->hwaddr + 4);
1056 if (!path || !path->ah || !path->ah->valid) {
1057 if (!path) {
1058 path = path_rec_create(dev, phdr->hwaddr + 4);
1059 if (!path)
1060 goto drop_and_unlock;
1061 __path_add(dev, path);
1062 } else {
1063 /*
1064 * make sure there are no changes in the existing
1065 * path record
1066 */
1067 init_path_rec(priv, path, phdr->hwaddr + 4);
1068 }
1069 if (!path->query && path_rec_start(dev, path)) {
1070 goto drop_and_unlock;
1071 }
1072
1073 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1074 push_pseudo_header(skb, phdr->hwaddr);
1075 __skb_queue_tail(&path->queue, skb);
1076 goto unlock;
1077 } else {
1078 goto drop_and_unlock;
1079 }
1080 }
1081
1082 spin_unlock_irqrestore(&priv->lock, flags);
1083 ipoib_dbg(priv, "Send unicast ARP to %08x\n",
1084 be32_to_cpu(sa_path_get_dlid(&path->pathrec)));
1085 path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1086 IPOIB_QPN(phdr->hwaddr));
1087 return;
1088
1089 drop_and_unlock:
1090 ++dev->stats.tx_dropped;
1091 dev_kfree_skb_any(skb);
1092 unlock:
1093 spin_unlock_irqrestore(&priv->lock, flags);
1094 }
1095
1096 static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
1097 {
1098 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1099 struct rdma_netdev *rn = netdev_priv(dev);
1100 struct ipoib_neigh *neigh;
1101 struct ipoib_pseudo_header *phdr;
1102 struct ipoib_header *header;
1103 unsigned long flags;
1104
1105 phdr = (struct ipoib_pseudo_header *) skb->data;
1106 skb_pull(skb, sizeof(*phdr));
1107 header = (struct ipoib_header *) skb->data;
1108
1109 if (unlikely(phdr->hwaddr[4] == 0xff)) {
1110 /* multicast, arrange "if" according to probability */
1111 if ((header->proto != htons(ETH_P_IP)) &&
1112 (header->proto != htons(ETH_P_IPV6)) &&
1113 (header->proto != htons(ETH_P_ARP)) &&
1114 (header->proto != htons(ETH_P_RARP)) &&
1115 (header->proto != htons(ETH_P_TIPC))) {
1116 /* ethertype not supported by IPoIB */
1117 ++dev->stats.tx_dropped;
1118 dev_kfree_skb_any(skb);
1119 return NETDEV_TX_OK;
1120 }
1121 /* Add in the P_Key for multicast*/
1122 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
1123 phdr->hwaddr[9] = priv->pkey & 0xff;
1124
1125 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1126 if (likely(neigh))
1127 goto send_using_neigh;
1128 ipoib_mcast_send(dev, phdr->hwaddr, skb);
1129 return NETDEV_TX_OK;
1130 }
1131
1132 /* unicast, arrange "switch" according to probability */
1133 switch (header->proto) {
1134 case htons(ETH_P_IP):
1135 case htons(ETH_P_IPV6):
1136 case htons(ETH_P_TIPC):
1137 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1138 if (unlikely(!neigh)) {
1139 neigh = neigh_add_path(skb, phdr->hwaddr, dev);
1140 if (likely(!neigh))
1141 return NETDEV_TX_OK;
1142 }
1143 break;
1144 case htons(ETH_P_ARP):
1145 case htons(ETH_P_RARP):
1146 /* for unicast ARP and RARP should always perform path find */
1147 unicast_arp_send(skb, dev, phdr);
1148 return NETDEV_TX_OK;
1149 default:
1150 /* ethertype not supported by IPoIB */
1151 ++dev->stats.tx_dropped;
1152 dev_kfree_skb_any(skb);
1153 return NETDEV_TX_OK;
1154 }
1155
1156 send_using_neigh:
1157 /* note we now hold a ref to neigh */
1158 if (ipoib_cm_get(neigh)) {
1159 if (ipoib_cm_up(neigh)) {
1160 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1161 goto unref;
1162 }
1163 } else if (neigh->ah && neigh->ah->valid) {
1164 neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah,
1165 IPOIB_QPN(phdr->hwaddr));
1166 goto unref;
1167 } else if (neigh->ah) {
1168 neigh_refresh_path(neigh, phdr->hwaddr, dev);
1169 }
1170
1171 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1172 push_pseudo_header(skb, phdr->hwaddr);
1173 spin_lock_irqsave(&priv->lock, flags);
1174 __skb_queue_tail(&neigh->queue, skb);
1175 spin_unlock_irqrestore(&priv->lock, flags);
1176 } else {
1177 ++dev->stats.tx_dropped;
1178 dev_kfree_skb_any(skb);
1179 }
1180
1181 unref:
1182 ipoib_neigh_put(neigh);
1183
1184 return NETDEV_TX_OK;
1185 }
1186
1187 static void ipoib_timeout(struct net_device *dev, unsigned int txqueue)
1188 {
1189 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1190 struct rdma_netdev *rn = netdev_priv(dev);
1191
1192 if (rn->tx_timeout) {
1193 rn->tx_timeout(dev, txqueue);
1194 return;
1195 }
1196 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1197 jiffies_to_msecs(jiffies - dev_trans_start(dev)));
1198 ipoib_warn(priv,
1199 "queue stopped %d, tx_head %u, tx_tail %u, global_tx_head %u, global_tx_tail %u\n",
1200 netif_queue_stopped(dev), priv->tx_head, priv->tx_tail,
1201 priv->global_tx_head, priv->global_tx_tail);
1202
1203 /* XXX reset QP, etc. */
1204 }
1205
1206 static int ipoib_hard_header(struct sk_buff *skb,
1207 struct net_device *dev,
1208 unsigned short type,
1209 const void *daddr,
1210 const void *saddr,
1211 unsigned int len)
1212 {
1213 struct ipoib_header *header;
1214
1215 header = skb_push(skb, sizeof(*header));
1216
1217 header->proto = htons(type);
1218 header->reserved = 0;
1219
1220 /*
1221 * we don't rely on dst_entry structure, always stuff the
1222 * destination address into skb hard header so we can figure out where
1223 * to send the packet later.
1224 */
1225 push_pseudo_header(skb, daddr);
1226
1227 return IPOIB_HARD_LEN;
1228 }
1229
1230 static void ipoib_set_mcast_list(struct net_device *dev)
1231 {
1232 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1233
1234 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1235 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1236 return;
1237 }
1238
1239 queue_work(priv->wq, &priv->restart_task);
1240 }
1241
1242 static int ipoib_get_iflink(const struct net_device *dev)
1243 {
1244 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1245
1246 /* parent interface */
1247 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1248 return dev->ifindex;
1249
1250 /* child/vlan interface */
1251 return priv->parent->ifindex;
1252 }
1253
1254 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1255 {
1256 /*
1257 * Use only the address parts that contributes to spreading
1258 * The subnet prefix is not used as one can not connect to
1259 * same remote port (GUID) using the same remote QPN via two
1260 * different subnets.
1261 */
1262 /* qpn octets[1:4) & port GUID octets[12:20) */
1263 u32 *d32 = (u32 *) daddr;
1264 u32 hv;
1265
1266 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1267 return hv & htbl->mask;
1268 }
1269
1270 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1271 {
1272 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1273 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1274 struct ipoib_neigh_hash *htbl;
1275 struct ipoib_neigh *neigh = NULL;
1276 u32 hash_val;
1277
1278 rcu_read_lock_bh();
1279
1280 htbl = rcu_dereference_bh(ntbl->htbl);
1281
1282 if (!htbl)
1283 goto out_unlock;
1284
1285 hash_val = ipoib_addr_hash(htbl, daddr);
1286 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1287 neigh != NULL;
1288 neigh = rcu_dereference_bh(neigh->hnext)) {
1289 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1290 /* found, take one ref on behalf of the caller */
1291 if (!refcount_inc_not_zero(&neigh->refcnt)) {
1292 /* deleted */
1293 neigh = NULL;
1294 goto out_unlock;
1295 }
1296
1297 if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
1298 neigh->alive = jiffies;
1299 goto out_unlock;
1300 }
1301 }
1302
1303 out_unlock:
1304 rcu_read_unlock_bh();
1305 return neigh;
1306 }
1307
1308 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1309 {
1310 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1311 struct ipoib_neigh_hash *htbl;
1312 unsigned long neigh_obsolete;
1313 unsigned long dt;
1314 unsigned long flags;
1315 int i;
1316 LIST_HEAD(remove_list);
1317
1318 spin_lock_irqsave(&priv->lock, flags);
1319
1320 htbl = rcu_dereference_protected(ntbl->htbl,
1321 lockdep_is_held(&priv->lock));
1322
1323 if (!htbl)
1324 goto out_unlock;
1325
1326 /* neigh is obsolete if it was idle for two GC periods */
1327 dt = 2 * arp_tbl.gc_interval;
1328 neigh_obsolete = jiffies - dt;
1329
1330 for (i = 0; i < htbl->size; i++) {
1331 struct ipoib_neigh *neigh;
1332 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1333
1334 while ((neigh = rcu_dereference_protected(*np,
1335 lockdep_is_held(&priv->lock))) != NULL) {
1336 /* was the neigh idle for two GC periods */
1337 if (time_after(neigh_obsolete, neigh->alive)) {
1338
1339 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1340
1341 rcu_assign_pointer(*np,
1342 rcu_dereference_protected(neigh->hnext,
1343 lockdep_is_held(&priv->lock)));
1344 /* remove from path/mc list */
1345 list_del_init(&neigh->list);
1346 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1347 } else {
1348 np = &neigh->hnext;
1349 }
1350
1351 }
1352 }
1353
1354 out_unlock:
1355 spin_unlock_irqrestore(&priv->lock, flags);
1356 ipoib_mcast_remove_list(&remove_list);
1357 }
1358
1359 static void ipoib_reap_neigh(struct work_struct *work)
1360 {
1361 struct ipoib_dev_priv *priv =
1362 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1363
1364 __ipoib_reap_neigh(priv);
1365
1366 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1367 arp_tbl.gc_interval);
1368 }
1369
1370
1371 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1372 struct net_device *dev)
1373 {
1374 struct ipoib_neigh *neigh;
1375
1376 neigh = kzalloc(sizeof(*neigh), GFP_ATOMIC);
1377 if (!neigh)
1378 return NULL;
1379
1380 neigh->dev = dev;
1381 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1382 skb_queue_head_init(&neigh->queue);
1383 INIT_LIST_HEAD(&neigh->list);
1384 ipoib_cm_set(neigh, NULL);
1385 /* one ref on behalf of the caller */
1386 refcount_set(&neigh->refcnt, 1);
1387
1388 return neigh;
1389 }
1390
1391 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1392 struct net_device *dev)
1393 {
1394 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1395 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1396 struct ipoib_neigh_hash *htbl;
1397 struct ipoib_neigh *neigh;
1398 u32 hash_val;
1399
1400 htbl = rcu_dereference_protected(ntbl->htbl,
1401 lockdep_is_held(&priv->lock));
1402 if (!htbl) {
1403 neigh = NULL;
1404 goto out_unlock;
1405 }
1406
1407 /* need to add a new neigh, but maybe some other thread succeeded?
1408 * recalc hash, maybe hash resize took place so we do a search
1409 */
1410 hash_val = ipoib_addr_hash(htbl, daddr);
1411 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1412 lockdep_is_held(&priv->lock));
1413 neigh != NULL;
1414 neigh = rcu_dereference_protected(neigh->hnext,
1415 lockdep_is_held(&priv->lock))) {
1416 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1417 /* found, take one ref on behalf of the caller */
1418 if (!refcount_inc_not_zero(&neigh->refcnt)) {
1419 /* deleted */
1420 neigh = NULL;
1421 break;
1422 }
1423 neigh->alive = jiffies;
1424 goto out_unlock;
1425 }
1426 }
1427
1428 neigh = ipoib_neigh_ctor(daddr, dev);
1429 if (!neigh)
1430 goto out_unlock;
1431
1432 /* one ref on behalf of the hash table */
1433 refcount_inc(&neigh->refcnt);
1434 neigh->alive = jiffies;
1435 /* put in hash */
1436 rcu_assign_pointer(neigh->hnext,
1437 rcu_dereference_protected(htbl->buckets[hash_val],
1438 lockdep_is_held(&priv->lock)));
1439 rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1440 atomic_inc(&ntbl->entries);
1441
1442 out_unlock:
1443
1444 return neigh;
1445 }
1446
1447 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1448 {
1449 /* neigh reference count was dropprd to zero */
1450 struct net_device *dev = neigh->dev;
1451 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1452 struct sk_buff *skb;
1453 if (neigh->ah)
1454 ipoib_put_ah(neigh->ah);
1455 while ((skb = __skb_dequeue(&neigh->queue))) {
1456 ++dev->stats.tx_dropped;
1457 dev_kfree_skb_any(skb);
1458 }
1459 if (ipoib_cm_get(neigh))
1460 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1461 ipoib_dbg(ipoib_priv(dev),
1462 "neigh free for %06x %pI6\n",
1463 IPOIB_QPN(neigh->daddr),
1464 neigh->daddr + 4);
1465 kfree(neigh);
1466 if (atomic_dec_and_test(&priv->ntbl.entries)) {
1467 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1468 complete(&priv->ntbl.flushed);
1469 }
1470 }
1471
1472 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1473 {
1474 /* Called as a result of removal from hash table */
1475 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1476 /* note TX context may hold another ref */
1477 ipoib_neigh_put(neigh);
1478 }
1479
1480 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1481 {
1482 struct net_device *dev = neigh->dev;
1483 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1484 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1485 struct ipoib_neigh_hash *htbl;
1486 struct ipoib_neigh __rcu **np;
1487 struct ipoib_neigh *n;
1488 u32 hash_val;
1489
1490 htbl = rcu_dereference_protected(ntbl->htbl,
1491 lockdep_is_held(&priv->lock));
1492 if (!htbl)
1493 return;
1494
1495 hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1496 np = &htbl->buckets[hash_val];
1497 for (n = rcu_dereference_protected(*np,
1498 lockdep_is_held(&priv->lock));
1499 n != NULL;
1500 n = rcu_dereference_protected(*np,
1501 lockdep_is_held(&priv->lock))) {
1502 if (n == neigh) {
1503 /* found */
1504 rcu_assign_pointer(*np,
1505 rcu_dereference_protected(neigh->hnext,
1506 lockdep_is_held(&priv->lock)));
1507 /* remove from parent list */
1508 list_del_init(&neigh->list);
1509 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1510 return;
1511 } else {
1512 np = &n->hnext;
1513 }
1514 }
1515 }
1516
1517 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1518 {
1519 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1520 struct ipoib_neigh_hash *htbl;
1521 struct ipoib_neigh __rcu **buckets;
1522 u32 size;
1523
1524 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1525 ntbl->htbl = NULL;
1526 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1527 if (!htbl)
1528 return -ENOMEM;
1529 size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1530 buckets = kvcalloc(size, sizeof(*buckets), GFP_KERNEL);
1531 if (!buckets) {
1532 kfree(htbl);
1533 return -ENOMEM;
1534 }
1535 htbl->size = size;
1536 htbl->mask = (size - 1);
1537 htbl->buckets = buckets;
1538 RCU_INIT_POINTER(ntbl->htbl, htbl);
1539 htbl->ntbl = ntbl;
1540 atomic_set(&ntbl->entries, 0);
1541
1542 /* start garbage collection */
1543 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1544 arp_tbl.gc_interval);
1545
1546 return 0;
1547 }
1548
1549 static void neigh_hash_free_rcu(struct rcu_head *head)
1550 {
1551 struct ipoib_neigh_hash *htbl = container_of(head,
1552 struct ipoib_neigh_hash,
1553 rcu);
1554 struct ipoib_neigh __rcu **buckets = htbl->buckets;
1555 struct ipoib_neigh_table *ntbl = htbl->ntbl;
1556
1557 kvfree(buckets);
1558 kfree(htbl);
1559 complete(&ntbl->deleted);
1560 }
1561
1562 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1563 {
1564 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1565 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1566 struct ipoib_neigh_hash *htbl;
1567 unsigned long flags;
1568 int i;
1569
1570 /* remove all neigh connected to a given path or mcast */
1571 spin_lock_irqsave(&priv->lock, flags);
1572
1573 htbl = rcu_dereference_protected(ntbl->htbl,
1574 lockdep_is_held(&priv->lock));
1575
1576 if (!htbl)
1577 goto out_unlock;
1578
1579 for (i = 0; i < htbl->size; i++) {
1580 struct ipoib_neigh *neigh;
1581 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1582
1583 while ((neigh = rcu_dereference_protected(*np,
1584 lockdep_is_held(&priv->lock))) != NULL) {
1585 /* delete neighs belong to this parent */
1586 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1587 rcu_assign_pointer(*np,
1588 rcu_dereference_protected(neigh->hnext,
1589 lockdep_is_held(&priv->lock)));
1590 /* remove from parent list */
1591 list_del_init(&neigh->list);
1592 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1593 } else {
1594 np = &neigh->hnext;
1595 }
1596
1597 }
1598 }
1599 out_unlock:
1600 spin_unlock_irqrestore(&priv->lock, flags);
1601 }
1602
1603 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1604 {
1605 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1606 struct ipoib_neigh_hash *htbl;
1607 unsigned long flags;
1608 int i, wait_flushed = 0;
1609
1610 init_completion(&priv->ntbl.flushed);
1611 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1612
1613 spin_lock_irqsave(&priv->lock, flags);
1614
1615 htbl = rcu_dereference_protected(ntbl->htbl,
1616 lockdep_is_held(&priv->lock));
1617 if (!htbl)
1618 goto out_unlock;
1619
1620 wait_flushed = atomic_read(&priv->ntbl.entries);
1621 if (!wait_flushed)
1622 goto free_htbl;
1623
1624 for (i = 0; i < htbl->size; i++) {
1625 struct ipoib_neigh *neigh;
1626 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1627
1628 while ((neigh = rcu_dereference_protected(*np,
1629 lockdep_is_held(&priv->lock))) != NULL) {
1630 rcu_assign_pointer(*np,
1631 rcu_dereference_protected(neigh->hnext,
1632 lockdep_is_held(&priv->lock)));
1633 /* remove from path/mc list */
1634 list_del_init(&neigh->list);
1635 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1636 }
1637 }
1638
1639 free_htbl:
1640 rcu_assign_pointer(ntbl->htbl, NULL);
1641 call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1642
1643 out_unlock:
1644 spin_unlock_irqrestore(&priv->lock, flags);
1645 if (wait_flushed)
1646 wait_for_completion(&priv->ntbl.flushed);
1647 }
1648
1649 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1650 {
1651 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1652
1653 ipoib_dbg(priv, "%s\n", __func__);
1654 init_completion(&priv->ntbl.deleted);
1655
1656 cancel_delayed_work_sync(&priv->neigh_reap_task);
1657
1658 ipoib_flush_neighs(priv);
1659
1660 wait_for_completion(&priv->ntbl.deleted);
1661 }
1662
1663 static void ipoib_napi_add(struct net_device *dev)
1664 {
1665 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1666
1667 netif_napi_add(dev, &priv->recv_napi, ipoib_rx_poll, IPOIB_NUM_WC);
1668 netif_napi_add(dev, &priv->send_napi, ipoib_tx_poll, MAX_SEND_CQE);
1669 }
1670
1671 static void ipoib_napi_del(struct net_device *dev)
1672 {
1673 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1674
1675 netif_napi_del(&priv->recv_napi);
1676 netif_napi_del(&priv->send_napi);
1677 }
1678
1679 static void ipoib_dev_uninit_default(struct net_device *dev)
1680 {
1681 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1682
1683 ipoib_transport_dev_cleanup(dev);
1684
1685 ipoib_napi_del(dev);
1686
1687 ipoib_cm_dev_cleanup(dev);
1688
1689 kfree(priv->rx_ring);
1690 vfree(priv->tx_ring);
1691
1692 priv->rx_ring = NULL;
1693 priv->tx_ring = NULL;
1694 }
1695
1696 static int ipoib_dev_init_default(struct net_device *dev)
1697 {
1698 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1699
1700 ipoib_napi_add(dev);
1701
1702 /* Allocate RX/TX "rings" to hold queued skbs */
1703 priv->rx_ring = kcalloc(ipoib_recvq_size,
1704 sizeof(*priv->rx_ring),
1705 GFP_KERNEL);
1706 if (!priv->rx_ring)
1707 goto out;
1708
1709 priv->tx_ring = vzalloc(array_size(ipoib_sendq_size,
1710 sizeof(*priv->tx_ring)));
1711 if (!priv->tx_ring) {
1712 pr_warn("%s: failed to allocate TX ring (%d entries)\n",
1713 priv->ca->name, ipoib_sendq_size);
1714 goto out_rx_ring_cleanup;
1715 }
1716
1717 /* priv->tx_head, tx_tail and global_tx_tail/head are already 0 */
1718
1719 if (ipoib_transport_dev_init(dev, priv->ca)) {
1720 pr_warn("%s: ipoib_transport_dev_init failed\n",
1721 priv->ca->name);
1722 goto out_tx_ring_cleanup;
1723 }
1724
1725 /* after qp created set dev address */
1726 priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff;
1727 priv->dev->dev_addr[2] = (priv->qp->qp_num >> 8) & 0xff;
1728 priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff;
1729
1730 return 0;
1731
1732 out_tx_ring_cleanup:
1733 vfree(priv->tx_ring);
1734
1735 out_rx_ring_cleanup:
1736 kfree(priv->rx_ring);
1737
1738 out:
1739 ipoib_napi_del(dev);
1740 return -ENOMEM;
1741 }
1742
1743 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
1744 int cmd)
1745 {
1746 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1747
1748 if (!priv->rn_ops->ndo_eth_ioctl)
1749 return -EOPNOTSUPP;
1750
1751 return priv->rn_ops->ndo_eth_ioctl(dev, ifr, cmd);
1752 }
1753
1754 static int ipoib_dev_init(struct net_device *dev)
1755 {
1756 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1757 int ret = -ENOMEM;
1758
1759 priv->qp = NULL;
1760
1761 /*
1762 * the various IPoIB tasks assume they will never race against
1763 * themselves, so always use a single thread workqueue
1764 */
1765 priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM);
1766 if (!priv->wq) {
1767 pr_warn("%s: failed to allocate device WQ\n", dev->name);
1768 goto out;
1769 }
1770
1771 /* create pd, which used both for control and datapath*/
1772 priv->pd = ib_alloc_pd(priv->ca, 0);
1773 if (IS_ERR(priv->pd)) {
1774 pr_warn("%s: failed to allocate PD\n", priv->ca->name);
1775 goto clean_wq;
1776 }
1777
1778 ret = priv->rn_ops->ndo_init(dev);
1779 if (ret) {
1780 pr_warn("%s failed to init HW resource\n", dev->name);
1781 goto out_free_pd;
1782 }
1783
1784 ret = ipoib_neigh_hash_init(priv);
1785 if (ret) {
1786 pr_warn("%s failed to init neigh hash\n", dev->name);
1787 goto out_dev_uninit;
1788 }
1789
1790 if (dev->flags & IFF_UP) {
1791 if (ipoib_ib_dev_open(dev)) {
1792 pr_warn("%s failed to open device\n", dev->name);
1793 ret = -ENODEV;
1794 goto out_hash_uninit;
1795 }
1796 }
1797
1798 return 0;
1799
1800 out_hash_uninit:
1801 ipoib_neigh_hash_uninit(dev);
1802
1803 out_dev_uninit:
1804 ipoib_ib_dev_cleanup(dev);
1805
1806 out_free_pd:
1807 if (priv->pd) {
1808 ib_dealloc_pd(priv->pd);
1809 priv->pd = NULL;
1810 }
1811
1812 clean_wq:
1813 if (priv->wq) {
1814 destroy_workqueue(priv->wq);
1815 priv->wq = NULL;
1816 }
1817
1818 out:
1819 return ret;
1820 }
1821
1822 /*
1823 * This must be called before doing an unregister_netdev on a parent device to
1824 * shutdown the IB event handler.
1825 */
1826 static void ipoib_parent_unregister_pre(struct net_device *ndev)
1827 {
1828 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1829
1830 /*
1831 * ipoib_set_mac checks netif_running before pushing work, clearing
1832 * running ensures the it will not add more work.
1833 */
1834 rtnl_lock();
1835 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP, NULL);
1836 rtnl_unlock();
1837
1838 /* ipoib_event() cannot be running once this returns */
1839 ib_unregister_event_handler(&priv->event_handler);
1840
1841 /*
1842 * Work on the queue grabs the rtnl lock, so this cannot be done while
1843 * also holding it.
1844 */
1845 flush_workqueue(ipoib_workqueue);
1846 }
1847
1848 static void ipoib_set_dev_features(struct ipoib_dev_priv *priv)
1849 {
1850 priv->hca_caps = priv->ca->attrs.device_cap_flags;
1851
1852 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1853 priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1854
1855 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1856 priv->dev->hw_features |= NETIF_F_TSO;
1857
1858 priv->dev->features |= priv->dev->hw_features;
1859 }
1860 }
1861
1862 static int ipoib_parent_init(struct net_device *ndev)
1863 {
1864 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1865 struct ib_port_attr attr;
1866 int result;
1867
1868 result = ib_query_port(priv->ca, priv->port, &attr);
1869 if (result) {
1870 pr_warn("%s: ib_query_port %d failed\n", priv->ca->name,
1871 priv->port);
1872 return result;
1873 }
1874 priv->max_ib_mtu = rdma_mtu_from_attr(priv->ca, priv->port, &attr);
1875
1876 result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
1877 if (result) {
1878 pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n",
1879 priv->ca->name, priv->port, result);
1880 return result;
1881 }
1882
1883 result = rdma_query_gid(priv->ca, priv->port, 0, &priv->local_gid);
1884 if (result) {
1885 pr_warn("%s: rdma_query_gid port %d failed (ret = %d)\n",
1886 priv->ca->name, priv->port, result);
1887 return result;
1888 }
1889 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw,
1890 sizeof(union ib_gid));
1891
1892 SET_NETDEV_DEV(priv->dev, priv->ca->dev.parent);
1893 priv->dev->dev_port = priv->port - 1;
1894 /* Let's set this one too for backwards compatibility. */
1895 priv->dev->dev_id = priv->port - 1;
1896
1897 return 0;
1898 }
1899
1900 static void ipoib_child_init(struct net_device *ndev)
1901 {
1902 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1903 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1904
1905 priv->max_ib_mtu = ppriv->max_ib_mtu;
1906 set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
1907 if (memchr_inv(priv->dev->dev_addr, 0, INFINIBAND_ALEN))
1908 memcpy(&priv->local_gid, priv->dev->dev_addr + 4,
1909 sizeof(priv->local_gid));
1910 else {
1911 memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr,
1912 INFINIBAND_ALEN);
1913 memcpy(&priv->local_gid, &ppriv->local_gid,
1914 sizeof(priv->local_gid));
1915 }
1916 }
1917
1918 static int ipoib_ndo_init(struct net_device *ndev)
1919 {
1920 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1921 int rc;
1922 struct rdma_netdev *rn = netdev_priv(ndev);
1923
1924 if (priv->parent) {
1925 ipoib_child_init(ndev);
1926 } else {
1927 rc = ipoib_parent_init(ndev);
1928 if (rc)
1929 return rc;
1930 }
1931
1932 /* MTU will be reset when mcast join happens */
1933 ndev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1934 priv->mcast_mtu = priv->admin_mtu = ndev->mtu;
1935 rn->mtu = priv->mcast_mtu;
1936 ndev->max_mtu = IPOIB_CM_MTU;
1937
1938 ndev->neigh_priv_len = sizeof(struct ipoib_neigh);
1939
1940 /*
1941 * Set the full membership bit, so that we join the right
1942 * broadcast group, etc.
1943 */
1944 priv->pkey |= 0x8000;
1945
1946 ndev->broadcast[8] = priv->pkey >> 8;
1947 ndev->broadcast[9] = priv->pkey & 0xff;
1948 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1949
1950 ipoib_set_dev_features(priv);
1951
1952 rc = ipoib_dev_init(ndev);
1953 if (rc) {
1954 pr_warn("%s: failed to initialize device: %s port %d (ret = %d)\n",
1955 priv->ca->name, priv->dev->name, priv->port, rc);
1956 return rc;
1957 }
1958
1959 if (priv->parent) {
1960 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1961
1962 dev_hold(priv->parent);
1963
1964 down_write(&ppriv->vlan_rwsem);
1965 list_add_tail(&priv->list, &ppriv->child_intfs);
1966 up_write(&ppriv->vlan_rwsem);
1967 }
1968
1969 return 0;
1970 }
1971
1972 static void ipoib_ndo_uninit(struct net_device *dev)
1973 {
1974 struct ipoib_dev_priv *priv = ipoib_priv(dev);
1975
1976 ASSERT_RTNL();
1977
1978 /*
1979 * ipoib_remove_one guarantees the children are removed before the
1980 * parent, and that is the only place where a parent can be removed.
1981 */
1982 WARN_ON(!list_empty(&priv->child_intfs));
1983
1984 if (priv->parent) {
1985 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1986
1987 down_write(&ppriv->vlan_rwsem);
1988 list_del(&priv->list);
1989 up_write(&ppriv->vlan_rwsem);
1990 }
1991
1992 ipoib_neigh_hash_uninit(dev);
1993
1994 ipoib_ib_dev_cleanup(dev);
1995
1996 /* no more works over the priv->wq */
1997 if (priv->wq) {
1998 /* See ipoib_mcast_carrier_on_task() */
1999 WARN_ON(test_bit(IPOIB_FLAG_OPER_UP, &priv->flags));
2000 flush_workqueue(priv->wq);
2001 destroy_workqueue(priv->wq);
2002 priv->wq = NULL;
2003 }
2004
2005 if (priv->parent)
2006 dev_put(priv->parent);
2007 }
2008
2009 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
2010 {
2011 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2012
2013 return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
2014 }
2015
2016 static int ipoib_get_vf_config(struct net_device *dev, int vf,
2017 struct ifla_vf_info *ivf)
2018 {
2019 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2020 int err;
2021
2022 err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
2023 if (err)
2024 return err;
2025
2026 ivf->vf = vf;
2027 memcpy(ivf->mac, dev->dev_addr, dev->addr_len);
2028
2029 return 0;
2030 }
2031
2032 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
2033 {
2034 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2035
2036 if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
2037 return -EINVAL;
2038
2039 return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
2040 }
2041
2042 static int ipoib_get_vf_guid(struct net_device *dev, int vf,
2043 struct ifla_vf_guid *node_guid,
2044 struct ifla_vf_guid *port_guid)
2045 {
2046 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2047
2048 return ib_get_vf_guid(priv->ca, vf, priv->port, node_guid, port_guid);
2049 }
2050
2051 static int ipoib_get_vf_stats(struct net_device *dev, int vf,
2052 struct ifla_vf_stats *vf_stats)
2053 {
2054 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2055
2056 return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
2057 }
2058
2059 static const struct header_ops ipoib_header_ops = {
2060 .create = ipoib_hard_header,
2061 };
2062
2063 static const struct net_device_ops ipoib_netdev_ops_pf = {
2064 .ndo_init = ipoib_ndo_init,
2065 .ndo_uninit = ipoib_ndo_uninit,
2066 .ndo_open = ipoib_open,
2067 .ndo_stop = ipoib_stop,
2068 .ndo_change_mtu = ipoib_change_mtu,
2069 .ndo_fix_features = ipoib_fix_features,
2070 .ndo_start_xmit = ipoib_start_xmit,
2071 .ndo_tx_timeout = ipoib_timeout,
2072 .ndo_set_rx_mode = ipoib_set_mcast_list,
2073 .ndo_get_iflink = ipoib_get_iflink,
2074 .ndo_set_vf_link_state = ipoib_set_vf_link_state,
2075 .ndo_get_vf_config = ipoib_get_vf_config,
2076 .ndo_get_vf_stats = ipoib_get_vf_stats,
2077 .ndo_get_vf_guid = ipoib_get_vf_guid,
2078 .ndo_set_vf_guid = ipoib_set_vf_guid,
2079 .ndo_set_mac_address = ipoib_set_mac,
2080 .ndo_get_stats64 = ipoib_get_stats,
2081 .ndo_eth_ioctl = ipoib_ioctl,
2082 };
2083
2084 static const struct net_device_ops ipoib_netdev_ops_vf = {
2085 .ndo_init = ipoib_ndo_init,
2086 .ndo_uninit = ipoib_ndo_uninit,
2087 .ndo_open = ipoib_open,
2088 .ndo_stop = ipoib_stop,
2089 .ndo_change_mtu = ipoib_change_mtu,
2090 .ndo_fix_features = ipoib_fix_features,
2091 .ndo_start_xmit = ipoib_start_xmit,
2092 .ndo_tx_timeout = ipoib_timeout,
2093 .ndo_set_rx_mode = ipoib_set_mcast_list,
2094 .ndo_get_iflink = ipoib_get_iflink,
2095 .ndo_get_stats64 = ipoib_get_stats,
2096 .ndo_eth_ioctl = ipoib_ioctl,
2097 };
2098
2099 static const struct net_device_ops ipoib_netdev_default_pf = {
2100 .ndo_init = ipoib_dev_init_default,
2101 .ndo_uninit = ipoib_dev_uninit_default,
2102 .ndo_open = ipoib_ib_dev_open_default,
2103 .ndo_stop = ipoib_ib_dev_stop_default,
2104 };
2105
2106 void ipoib_setup_common(struct net_device *dev)
2107 {
2108 dev->header_ops = &ipoib_header_ops;
2109 dev->netdev_ops = &ipoib_netdev_default_pf;
2110
2111 ipoib_set_ethtool_ops(dev);
2112
2113 dev->watchdog_timeo = HZ;
2114
2115 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
2116
2117 dev->hard_header_len = IPOIB_HARD_LEN;
2118 dev->addr_len = INFINIBAND_ALEN;
2119 dev->type = ARPHRD_INFINIBAND;
2120 dev->tx_queue_len = ipoib_sendq_size * 2;
2121 dev->features = (NETIF_F_VLAN_CHALLENGED |
2122 NETIF_F_HIGHDMA);
2123 netif_keep_dst(dev);
2124
2125 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
2126
2127 /*
2128 * unregister_netdev always frees the netdev, we use this mode
2129 * consistently to unify all the various unregister paths, including
2130 * those connected to rtnl_link_ops which require it.
2131 */
2132 dev->needs_free_netdev = true;
2133 }
2134
2135 static void ipoib_build_priv(struct net_device *dev)
2136 {
2137 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2138
2139 priv->dev = dev;
2140 spin_lock_init(&priv->lock);
2141 init_rwsem(&priv->vlan_rwsem);
2142 mutex_init(&priv->mcast_mutex);
2143
2144 INIT_LIST_HEAD(&priv->path_list);
2145 INIT_LIST_HEAD(&priv->child_intfs);
2146 INIT_LIST_HEAD(&priv->dead_ahs);
2147 INIT_LIST_HEAD(&priv->multicast_list);
2148
2149 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
2150 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
2151 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
2152 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
2153 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
2154 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
2155 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
2156 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
2157 }
2158
2159 static struct net_device *ipoib_alloc_netdev(struct ib_device *hca, u32 port,
2160 const char *name)
2161 {
2162 struct net_device *dev;
2163
2164 dev = rdma_alloc_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
2165 NET_NAME_UNKNOWN, ipoib_setup_common);
2166 if (!IS_ERR(dev) || PTR_ERR(dev) != -EOPNOTSUPP)
2167 return dev;
2168
2169 dev = alloc_netdev(sizeof(struct rdma_netdev), name, NET_NAME_UNKNOWN,
2170 ipoib_setup_common);
2171 if (!dev)
2172 return ERR_PTR(-ENOMEM);
2173 return dev;
2174 }
2175
2176 int ipoib_intf_init(struct ib_device *hca, u32 port, const char *name,
2177 struct net_device *dev)
2178 {
2179 struct rdma_netdev *rn = netdev_priv(dev);
2180 struct ipoib_dev_priv *priv;
2181 int rc;
2182
2183 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2184 if (!priv)
2185 return -ENOMEM;
2186
2187 priv->ca = hca;
2188 priv->port = port;
2189
2190 rc = rdma_init_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
2191 NET_NAME_UNKNOWN, ipoib_setup_common, dev);
2192 if (rc) {
2193 if (rc != -EOPNOTSUPP)
2194 goto out;
2195
2196 rn->send = ipoib_send;
2197 rn->attach_mcast = ipoib_mcast_attach;
2198 rn->detach_mcast = ipoib_mcast_detach;
2199 rn->hca = hca;
2200 }
2201
2202 priv->rn_ops = dev->netdev_ops;
2203
2204 if (hca->attrs.device_cap_flags & IB_DEVICE_VIRTUAL_FUNCTION)
2205 dev->netdev_ops = &ipoib_netdev_ops_vf;
2206 else
2207 dev->netdev_ops = &ipoib_netdev_ops_pf;
2208
2209 rn->clnt_priv = priv;
2210 /*
2211 * Only the child register_netdev flows can handle priv_destructor
2212 * being set, so we force it to NULL here and handle manually until it
2213 * is safe to turn on.
2214 */
2215 priv->next_priv_destructor = dev->priv_destructor;
2216 dev->priv_destructor = NULL;
2217
2218 ipoib_build_priv(dev);
2219
2220 return 0;
2221
2222 out:
2223 kfree(priv);
2224 return rc;
2225 }
2226
2227 struct net_device *ipoib_intf_alloc(struct ib_device *hca, u32 port,
2228 const char *name)
2229 {
2230 struct net_device *dev;
2231 int rc;
2232
2233 dev = ipoib_alloc_netdev(hca, port, name);
2234 if (IS_ERR(dev))
2235 return dev;
2236
2237 rc = ipoib_intf_init(hca, port, name, dev);
2238 if (rc) {
2239 free_netdev(dev);
2240 return ERR_PTR(rc);
2241 }
2242
2243 /*
2244 * Upon success the caller must ensure ipoib_intf_free is called or
2245 * register_netdevice succeed'd and priv_destructor is set to
2246 * ipoib_intf_free.
2247 */
2248 return dev;
2249 }
2250
2251 void ipoib_intf_free(struct net_device *dev)
2252 {
2253 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2254 struct rdma_netdev *rn = netdev_priv(dev);
2255
2256 dev->priv_destructor = priv->next_priv_destructor;
2257 if (dev->priv_destructor)
2258 dev->priv_destructor(dev);
2259
2260 /*
2261 * There are some error flows around register_netdev failing that may
2262 * attempt to call priv_destructor twice, prevent that from happening.
2263 */
2264 dev->priv_destructor = NULL;
2265
2266 /* unregister/destroy is very complicated. Make bugs more obvious. */
2267 rn->clnt_priv = NULL;
2268
2269 kfree(priv);
2270 }
2271
2272 static ssize_t pkey_show(struct device *dev, struct device_attribute *attr,
2273 char *buf)
2274 {
2275 struct net_device *ndev = to_net_dev(dev);
2276 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2277
2278 return sysfs_emit(buf, "0x%04x\n", priv->pkey);
2279 }
2280 static DEVICE_ATTR_RO(pkey);
2281
2282 static ssize_t umcast_show(struct device *dev, struct device_attribute *attr,
2283 char *buf)
2284 {
2285 struct net_device *ndev = to_net_dev(dev);
2286 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2287
2288 return sysfs_emit(buf, "%d\n",
2289 test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
2290 }
2291
2292 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
2293 {
2294 struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2295
2296 if (umcast_val > 0) {
2297 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2298 ipoib_warn(priv, "ignoring multicast groups joined directly "
2299 "by userspace\n");
2300 } else
2301 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2302 }
2303
2304 static ssize_t umcast_store(struct device *dev, struct device_attribute *attr,
2305 const char *buf, size_t count)
2306 {
2307 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
2308
2309 ipoib_set_umcast(to_net_dev(dev), umcast_val);
2310
2311 return count;
2312 }
2313 static DEVICE_ATTR_RW(umcast);
2314
2315 int ipoib_add_umcast_attr(struct net_device *dev)
2316 {
2317 return device_create_file(&dev->dev, &dev_attr_umcast);
2318 }
2319
2320 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
2321 {
2322 struct ipoib_dev_priv *child_priv;
2323 struct net_device *netdev = priv->dev;
2324
2325 netif_addr_lock_bh(netdev);
2326
2327 memcpy(&priv->local_gid.global.interface_id,
2328 &gid->global.interface_id,
2329 sizeof(gid->global.interface_id));
2330 memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
2331 clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2332
2333 netif_addr_unlock_bh(netdev);
2334
2335 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
2336 down_read(&priv->vlan_rwsem);
2337 list_for_each_entry(child_priv, &priv->child_intfs, list)
2338 set_base_guid(child_priv, gid);
2339 up_read(&priv->vlan_rwsem);
2340 }
2341 }
2342
2343 static int ipoib_check_lladdr(struct net_device *dev,
2344 struct sockaddr_storage *ss)
2345 {
2346 union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
2347 int ret = 0;
2348
2349 netif_addr_lock_bh(dev);
2350
2351 /* Make sure the QPN, reserved and subnet prefix match the current
2352 * lladdr, it also makes sure the lladdr is unicast.
2353 */
2354 if (memcmp(dev->dev_addr, ss->__data,
2355 4 + sizeof(gid->global.subnet_prefix)) ||
2356 gid->global.interface_id == 0)
2357 ret = -EINVAL;
2358
2359 netif_addr_unlock_bh(dev);
2360
2361 return ret;
2362 }
2363
2364 static int ipoib_set_mac(struct net_device *dev, void *addr)
2365 {
2366 struct ipoib_dev_priv *priv = ipoib_priv(dev);
2367 struct sockaddr_storage *ss = addr;
2368 int ret;
2369
2370 if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
2371 return -EBUSY;
2372
2373 ret = ipoib_check_lladdr(dev, ss);
2374 if (ret)
2375 return ret;
2376
2377 set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
2378
2379 queue_work(ipoib_workqueue, &priv->flush_light);
2380
2381 return 0;
2382 }
2383
2384 static ssize_t create_child_store(struct device *dev,
2385 struct device_attribute *attr,
2386 const char *buf, size_t count)
2387 {
2388 int pkey;
2389 int ret;
2390
2391 if (sscanf(buf, "%i", &pkey) != 1)
2392 return -EINVAL;
2393
2394 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
2395 return -EINVAL;
2396
2397 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
2398
2399 return ret ? ret : count;
2400 }
2401 static DEVICE_ATTR_WO(create_child);
2402
2403 static ssize_t delete_child_store(struct device *dev,
2404 struct device_attribute *attr,
2405 const char *buf, size_t count)
2406 {
2407 int pkey;
2408 int ret;
2409
2410 if (sscanf(buf, "%i", &pkey) != 1)
2411 return -EINVAL;
2412
2413 if (pkey < 0 || pkey > 0xffff)
2414 return -EINVAL;
2415
2416 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
2417
2418 return ret ? ret : count;
2419
2420 }
2421 static DEVICE_ATTR_WO(delete_child);
2422
2423 int ipoib_add_pkey_attr(struct net_device *dev)
2424 {
2425 return device_create_file(&dev->dev, &dev_attr_pkey);
2426 }
2427
2428 /*
2429 * We erroneously exposed the iface's port number in the dev_id
2430 * sysfs field long after dev_port was introduced for that purpose[1],
2431 * and we need to stop everyone from relying on that.
2432 * Let's overload the shower routine for the dev_id file here
2433 * to gently bring the issue up.
2434 *
2435 * [1] https://www.spinics.net/lists/netdev/msg272123.html
2436 */
2437 static ssize_t dev_id_show(struct device *dev,
2438 struct device_attribute *attr, char *buf)
2439 {
2440 struct net_device *ndev = to_net_dev(dev);
2441
2442 /*
2443 * ndev->dev_port will be equal to 0 in old kernel prior to commit
2444 * 9b8b2a323008 ("IB/ipoib: Use dev_port to expose network interface
2445 * port numbers") Zero was chosen as special case for user space
2446 * applications to fallback and query dev_id to check if it has
2447 * different value or not.
2448 *
2449 * Don't print warning in such scenario.
2450 *
2451 * https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L358
2452 */
2453 if (ndev->dev_port && ndev->dev_id == ndev->dev_port)
2454 netdev_info_once(ndev,
2455 "\"%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",
2456 current->comm);
2457
2458 return sysfs_emit(buf, "%#x\n", ndev->dev_id);
2459 }
2460 static DEVICE_ATTR_RO(dev_id);
2461
2462 static int ipoib_intercept_dev_id_attr(struct net_device *dev)
2463 {
2464 device_remove_file(&dev->dev, &dev_attr_dev_id);
2465 return device_create_file(&dev->dev, &dev_attr_dev_id);
2466 }
2467
2468 static struct net_device *ipoib_add_port(const char *format,
2469 struct ib_device *hca, u32 port)
2470 {
2471 struct rtnl_link_ops *ops = ipoib_get_link_ops();
2472 struct rdma_netdev_alloc_params params;
2473 struct ipoib_dev_priv *priv;
2474 struct net_device *ndev;
2475 int result;
2476
2477 ndev = ipoib_intf_alloc(hca, port, format);
2478 if (IS_ERR(ndev)) {
2479 pr_warn("%s, %d: ipoib_intf_alloc failed %ld\n", hca->name, port,
2480 PTR_ERR(ndev));
2481 return ndev;
2482 }
2483 priv = ipoib_priv(ndev);
2484
2485 INIT_IB_EVENT_HANDLER(&priv->event_handler,
2486 priv->ca, ipoib_event);
2487 ib_register_event_handler(&priv->event_handler);
2488
2489 /* call event handler to ensure pkey in sync */
2490 queue_work(ipoib_workqueue, &priv->flush_heavy);
2491
2492 ndev->rtnl_link_ops = ipoib_get_link_ops();
2493
2494 result = register_netdev(ndev);
2495 if (result) {
2496 pr_warn("%s: couldn't register ipoib port %d; error %d\n",
2497 hca->name, port, result);
2498
2499 ipoib_parent_unregister_pre(ndev);
2500 ipoib_intf_free(ndev);
2501 free_netdev(ndev);
2502
2503 return ERR_PTR(result);
2504 }
2505
2506 if (hca->ops.rdma_netdev_get_params) {
2507 int rc = hca->ops.rdma_netdev_get_params(hca, port,
2508 RDMA_NETDEV_IPOIB,
2509 &params);
2510
2511 if (!rc && ops->priv_size < params.sizeof_priv)
2512 ops->priv_size = params.sizeof_priv;
2513 }
2514 /*
2515 * We cannot set priv_destructor before register_netdev because we
2516 * need priv to be always valid during the error flow to execute
2517 * ipoib_parent_unregister_pre(). Instead handle it manually and only
2518 * enter priv_destructor mode once we are completely registered.
2519 */
2520 ndev->priv_destructor = ipoib_intf_free;
2521
2522 if (ipoib_intercept_dev_id_attr(ndev))
2523 goto sysfs_failed;
2524 if (ipoib_cm_add_mode_attr(ndev))
2525 goto sysfs_failed;
2526 if (ipoib_add_pkey_attr(ndev))
2527 goto sysfs_failed;
2528 if (ipoib_add_umcast_attr(ndev))
2529 goto sysfs_failed;
2530 if (device_create_file(&ndev->dev, &dev_attr_create_child))
2531 goto sysfs_failed;
2532 if (device_create_file(&ndev->dev, &dev_attr_delete_child))
2533 goto sysfs_failed;
2534
2535 return ndev;
2536
2537 sysfs_failed:
2538 ipoib_parent_unregister_pre(ndev);
2539 unregister_netdev(ndev);
2540 return ERR_PTR(-ENOMEM);
2541 }
2542
2543 static int ipoib_add_one(struct ib_device *device)
2544 {
2545 struct list_head *dev_list;
2546 struct net_device *dev;
2547 struct ipoib_dev_priv *priv;
2548 unsigned int p;
2549 int count = 0;
2550
2551 dev_list = kmalloc(sizeof(*dev_list), GFP_KERNEL);
2552 if (!dev_list)
2553 return -ENOMEM;
2554
2555 INIT_LIST_HEAD(dev_list);
2556
2557 rdma_for_each_port (device, p) {
2558 if (!rdma_protocol_ib(device, p))
2559 continue;
2560 dev = ipoib_add_port("ib%d", device, p);
2561 if (!IS_ERR(dev)) {
2562 priv = ipoib_priv(dev);
2563 list_add_tail(&priv->list, dev_list);
2564 count++;
2565 }
2566 }
2567
2568 if (!count) {
2569 kfree(dev_list);
2570 return -EOPNOTSUPP;
2571 }
2572
2573 ib_set_client_data(device, &ipoib_client, dev_list);
2574 return 0;
2575 }
2576
2577 static void ipoib_remove_one(struct ib_device *device, void *client_data)
2578 {
2579 struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv;
2580 struct list_head *dev_list = client_data;
2581
2582 list_for_each_entry_safe(priv, tmp, dev_list, list) {
2583 LIST_HEAD(head);
2584 ipoib_parent_unregister_pre(priv->dev);
2585
2586 rtnl_lock();
2587
2588 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs,
2589 list)
2590 unregister_netdevice_queue(cpriv->dev, &head);
2591 unregister_netdevice_queue(priv->dev, &head);
2592 unregister_netdevice_many(&head);
2593
2594 rtnl_unlock();
2595 }
2596
2597 kfree(dev_list);
2598 }
2599
2600 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2601 static struct notifier_block ipoib_netdev_notifier = {
2602 .notifier_call = ipoib_netdev_event,
2603 };
2604 #endif
2605
2606 static int __init ipoib_init_module(void)
2607 {
2608 int ret;
2609
2610 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2611 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2612 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2613
2614 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2615 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2616 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2617 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2618 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2619 ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0);
2620 #endif
2621
2622 /*
2623 * When copying small received packets, we only copy from the
2624 * linear data part of the SKB, so we rely on this condition.
2625 */
2626 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2627
2628 ipoib_register_debugfs();
2629
2630 /*
2631 * We create a global workqueue here that is used for all flush
2632 * operations. However, if you attempt to flush a workqueue
2633 * from a task on that same workqueue, it deadlocks the system.
2634 * We want to be able to flush the tasks associated with a
2635 * specific net device, so we also create a workqueue for each
2636 * netdevice. We queue up the tasks for that device only on
2637 * its private workqueue, and we only queue up flush events
2638 * on our global flush workqueue. This avoids the deadlocks.
2639 */
2640 ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 0);
2641 if (!ipoib_workqueue) {
2642 ret = -ENOMEM;
2643 goto err_fs;
2644 }
2645
2646 ib_sa_register_client(&ipoib_sa_client);
2647
2648 ret = ib_register_client(&ipoib_client);
2649 if (ret)
2650 goto err_sa;
2651
2652 ret = ipoib_netlink_init();
2653 if (ret)
2654 goto err_client;
2655
2656 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2657 register_netdevice_notifier(&ipoib_netdev_notifier);
2658 #endif
2659 return 0;
2660
2661 err_client:
2662 ib_unregister_client(&ipoib_client);
2663
2664 err_sa:
2665 ib_sa_unregister_client(&ipoib_sa_client);
2666 destroy_workqueue(ipoib_workqueue);
2667
2668 err_fs:
2669 ipoib_unregister_debugfs();
2670
2671 return ret;
2672 }
2673
2674 static void __exit ipoib_cleanup_module(void)
2675 {
2676 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2677 unregister_netdevice_notifier(&ipoib_netdev_notifier);
2678 #endif
2679 ipoib_netlink_fini();
2680 ib_unregister_client(&ipoib_client);
2681 ib_sa_unregister_client(&ipoib_sa_client);
2682 ipoib_unregister_debugfs();
2683 destroy_workqueue(ipoib_workqueue);
2684 }
2685
2686 module_init(ipoib_init_module);
2687 module_exit(ipoib_cleanup_module);
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