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powerpc/mm/4k: don't allocate larger pmd page table for 4k
[linux/fpc-iii.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
blob3ce0765a05ab615289760fb9c8257b437854efef
1 /*
2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4 * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
5 *
6 * This software is available to you under a choice of one of two
7 * licenses. You may choose to be licensed under the terms of the GNU
8 * General Public License (GPL) Version 2, available from the file
9 * COPYING in the main directory of this source tree, or the
10 * OpenIB.org BSD license below:
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
18 * disclaimer.
19 *
20 * - Redistributions in binary form must reproduce the above
21 * copyright notice, this list of conditions and the following
22 * disclaimer in the documentation and/or other materials
23 * provided with the distribution.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32 * SOFTWARE.
33 */
34
35 #include "ipoib.h"
36
37 #include <linux/module.h>
38
39 #include <linux/init.h>
40 #include <linux/slab.h>
41 #include <linux/kernel.h>
42 #include <linux/vmalloc.h>
43
44 #include <linux/if_arp.h> /* For ARPHRD_xxx */
45
46 #include <linux/ip.h>
47 #include <linux/in.h>
48
49 #include <linux/jhash.h>
50 #include <net/arp.h>
51 #include <net/addrconf.h>
52 #include <linux/inetdevice.h>
53 #include <rdma/ib_cache.h>
54 #include <linux/pci.h>
55
56 #define DRV_VERSION "1.0.0"
57
58 const char ipoib_driver_version[] = DRV_VERSION;
59
60 MODULE_AUTHOR("Roland Dreier");
61 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
62 MODULE_LICENSE("Dual BSD/GPL");
63 MODULE_VERSION(DRV_VERSION);
64
65 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
66 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
67
68 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
69 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
70 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
71 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
72
73 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
74 int ipoib_debug_level;
75
76 module_param_named(debug_level, ipoib_debug_level, int, 0644);
77 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
78 #endif
79
80 struct ipoib_path_iter {
81 struct net_device *dev;
82 struct ipoib_path path;
83 };
84
85 static const u8 ipv4_bcast_addr[] = {
86 0x00, 0xff, 0xff, 0xff,
87 0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
88 0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
89 };
90
91 struct workqueue_struct *ipoib_workqueue;
92
93 struct ib_sa_client ipoib_sa_client;
94
95 static void ipoib_add_one(struct ib_device *device);
96 static void ipoib_remove_one(struct ib_device *device, void *client_data);
97 static void ipoib_neigh_reclaim(struct rcu_head *rp);
98 static struct net_device *ipoib_get_net_dev_by_params(
99 struct ib_device *dev, u8 port, u16 pkey,
100 const union ib_gid *gid, const struct sockaddr *addr,
101 void *client_data);
102 static int ipoib_set_mac(struct net_device *dev, void *addr);
103
104 static struct ib_client ipoib_client = {
105 .name = "ipoib",
106 .add = ipoib_add_one,
107 .remove = ipoib_remove_one,
108 .get_net_dev_by_params = ipoib_get_net_dev_by_params,
109 };
110
111 int ipoib_open(struct net_device *dev)
112 {
113 struct ipoib_dev_priv *priv = netdev_priv(dev);
114
115 ipoib_dbg(priv, "bringing up interface\n");
116
117 netif_carrier_off(dev);
118
119 set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
120
121 priv->sm_fullmember_sendonly_support = false;
122
123 if (ipoib_ib_dev_open(dev)) {
124 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
125 return 0;
126 goto err_disable;
127 }
128
129 if (ipoib_ib_dev_up(dev))
130 goto err_stop;
131
132 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
133 struct ipoib_dev_priv *cpriv;
134
135 /* Bring up any child interfaces too */
136 down_read(&priv->vlan_rwsem);
137 list_for_each_entry(cpriv, &priv->child_intfs, list) {
138 int flags;
139
140 flags = cpriv->dev->flags;
141 if (flags & IFF_UP)
142 continue;
143
144 dev_change_flags(cpriv->dev, flags | IFF_UP);
145 }
146 up_read(&priv->vlan_rwsem);
147 }
148
149 netif_start_queue(dev);
150
151 return 0;
152
153 err_stop:
154 ipoib_ib_dev_stop(dev);
155
156 err_disable:
157 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
158
159 return -EINVAL;
160 }
161
162 static int ipoib_stop(struct net_device *dev)
163 {
164 struct ipoib_dev_priv *priv = netdev_priv(dev);
165
166 ipoib_dbg(priv, "stopping interface\n");
167
168 clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
169
170 netif_stop_queue(dev);
171
172 ipoib_ib_dev_down(dev);
173 ipoib_ib_dev_stop(dev);
174
175 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
176 struct ipoib_dev_priv *cpriv;
177
178 /* Bring down any child interfaces too */
179 down_read(&priv->vlan_rwsem);
180 list_for_each_entry(cpriv, &priv->child_intfs, list) {
181 int flags;
182
183 flags = cpriv->dev->flags;
184 if (!(flags & IFF_UP))
185 continue;
186
187 dev_change_flags(cpriv->dev, flags & ~IFF_UP);
188 }
189 up_read(&priv->vlan_rwsem);
190 }
191
192 return 0;
193 }
194
195 static void ipoib_uninit(struct net_device *dev)
196 {
197 ipoib_dev_cleanup(dev);
198 }
199
200 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
201 {
202 struct ipoib_dev_priv *priv = netdev_priv(dev);
203
204 if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
205 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
206
207 return features;
208 }
209
210 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
211 {
212 struct ipoib_dev_priv *priv = netdev_priv(dev);
213
214 /* dev->mtu > 2K ==> connected mode */
215 if (ipoib_cm_admin_enabled(dev)) {
216 if (new_mtu > ipoib_cm_max_mtu(dev))
217 return -EINVAL;
218
219 if (new_mtu > priv->mcast_mtu)
220 ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
221 priv->mcast_mtu);
222
223 dev->mtu = new_mtu;
224 return 0;
225 }
226
227 if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
228 return -EINVAL;
229
230 priv->admin_mtu = new_mtu;
231
232 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
233
234 return 0;
235 }
236
237 /* Called with an RCU read lock taken */
238 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
239 struct net_device *dev)
240 {
241 struct net *net = dev_net(dev);
242 struct in_device *in_dev;
243 struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
244 struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
245 __be32 ret_addr;
246
247 switch (addr->sa_family) {
248 case AF_INET:
249 in_dev = in_dev_get(dev);
250 if (!in_dev)
251 return false;
252
253 ret_addr = inet_confirm_addr(net, in_dev, 0,
254 addr_in->sin_addr.s_addr,
255 RT_SCOPE_HOST);
256 in_dev_put(in_dev);
257 if (ret_addr)
258 return true;
259
260 break;
261 case AF_INET6:
262 if (IS_ENABLED(CONFIG_IPV6) &&
263 ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
264 return true;
265
266 break;
267 }
268 return false;
269 }
270
271 /**
272 * Find the master net_device on top of the given net_device.
273 * @dev: base IPoIB net_device
274 *
275 * Returns the master net_device with a reference held, or the same net_device
276 * if no master exists.
277 */
278 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
279 {
280 struct net_device *master;
281
282 rcu_read_lock();
283 master = netdev_master_upper_dev_get_rcu(dev);
284 if (master)
285 dev_hold(master);
286 rcu_read_unlock();
287
288 if (master)
289 return master;
290
291 dev_hold(dev);
292 return dev;
293 }
294
295 struct ipoib_walk_data {
296 const struct sockaddr *addr;
297 struct net_device *result;
298 };
299
300 static int ipoib_upper_walk(struct net_device *upper, void *_data)
301 {
302 struct ipoib_walk_data *data = _data;
303 int ret = 0;
304
305 if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) {
306 dev_hold(upper);
307 data->result = upper;
308 ret = 1;
309 }
310
311 return ret;
312 }
313
314 /**
315 * Find a net_device matching the given address, which is an upper device of
316 * the given net_device.
317 * @addr: IP address to look for.
318 * @dev: base IPoIB net_device
319 *
320 * If found, returns the net_device with a reference held. Otherwise return
321 * NULL.
322 */
323 static struct net_device *ipoib_get_net_dev_match_addr(
324 const struct sockaddr *addr, struct net_device *dev)
325 {
326 struct ipoib_walk_data data = {
327 .addr = addr,
328 };
329
330 rcu_read_lock();
331 if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
332 dev_hold(dev);
333 data.result = dev;
334 goto out;
335 }
336
337 netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &data);
338 out:
339 rcu_read_unlock();
340 return data.result;
341 }
342
343 /* returns the number of IPoIB netdevs on top a given ipoib device matching a
344 * pkey_index and address, if one exists.
345 *
346 * @found_net_dev: contains a matching net_device if the return value >= 1,
347 * with a reference held. */
348 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
349 const union ib_gid *gid,
350 u16 pkey_index,
351 const struct sockaddr *addr,
352 int nesting,
353 struct net_device **found_net_dev)
354 {
355 struct ipoib_dev_priv *child_priv;
356 struct net_device *net_dev = NULL;
357 int matches = 0;
358
359 if (priv->pkey_index == pkey_index &&
360 (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
361 if (!addr) {
362 net_dev = ipoib_get_master_net_dev(priv->dev);
363 } else {
364 /* Verify the net_device matches the IP address, as
365 * IPoIB child devices currently share a GID. */
366 net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
367 }
368 if (net_dev) {
369 if (!*found_net_dev)
370 *found_net_dev = net_dev;
371 else
372 dev_put(net_dev);
373 ++matches;
374 }
375 }
376
377 /* Check child interfaces */
378 down_read_nested(&priv->vlan_rwsem, nesting);
379 list_for_each_entry(child_priv, &priv->child_intfs, list) {
380 matches += ipoib_match_gid_pkey_addr(child_priv, gid,
381 pkey_index, addr,
382 nesting + 1,
383 found_net_dev);
384 if (matches > 1)
385 break;
386 }
387 up_read(&priv->vlan_rwsem);
388
389 return matches;
390 }
391
392 /* Returns the number of matching net_devs found (between 0 and 2). Also
393 * return the matching net_device in the @net_dev parameter, holding a
394 * reference to the net_device, if the number of matches >= 1 */
395 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
396 u16 pkey_index,
397 const union ib_gid *gid,
398 const struct sockaddr *addr,
399 struct net_device **net_dev)
400 {
401 struct ipoib_dev_priv *priv;
402 int matches = 0;
403
404 *net_dev = NULL;
405
406 list_for_each_entry(priv, dev_list, list) {
407 if (priv->port != port)
408 continue;
409
410 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
411 addr, 0, net_dev);
412 if (matches > 1)
413 break;
414 }
415
416 return matches;
417 }
418
419 static struct net_device *ipoib_get_net_dev_by_params(
420 struct ib_device *dev, u8 port, u16 pkey,
421 const union ib_gid *gid, const struct sockaddr *addr,
422 void *client_data)
423 {
424 struct net_device *net_dev;
425 struct list_head *dev_list = client_data;
426 u16 pkey_index;
427 int matches;
428 int ret;
429
430 if (!rdma_protocol_ib(dev, port))
431 return NULL;
432
433 ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
434 if (ret)
435 return NULL;
436
437 if (!dev_list)
438 return NULL;
439
440 /* See if we can find a unique device matching the L2 parameters */
441 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
442 gid, NULL, &net_dev);
443
444 switch (matches) {
445 case 0:
446 return NULL;
447 case 1:
448 return net_dev;
449 }
450
451 dev_put(net_dev);
452
453 /* Couldn't find a unique device with L2 parameters only. Use L3
454 * address to uniquely match the net device */
455 matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
456 gid, addr, &net_dev);
457 switch (matches) {
458 case 0:
459 return NULL;
460 default:
461 dev_warn_ratelimited(&dev->dev,
462 "duplicate IP address detected\n");
463 /* Fall through */
464 case 1:
465 return net_dev;
466 }
467 }
468
469 int ipoib_set_mode(struct net_device *dev, const char *buf)
470 {
471 struct ipoib_dev_priv *priv = netdev_priv(dev);
472
473 /* flush paths if we switch modes so that connections are restarted */
474 if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
475 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
476 ipoib_warn(priv, "enabling connected mode "
477 "will cause multicast packet drops\n");
478 netdev_update_features(dev);
479 dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
480 rtnl_unlock();
481 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
482
483 ipoib_flush_paths(dev);
484 rtnl_lock();
485 return 0;
486 }
487
488 if (!strcmp(buf, "datagram\n")) {
489 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
490 netdev_update_features(dev);
491 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
492 rtnl_unlock();
493 ipoib_flush_paths(dev);
494 rtnl_lock();
495 return 0;
496 }
497
498 return -EINVAL;
499 }
500
501 struct ipoib_path *__path_find(struct net_device *dev, void *gid)
502 {
503 struct ipoib_dev_priv *priv = netdev_priv(dev);
504 struct rb_node *n = priv->path_tree.rb_node;
505 struct ipoib_path *path;
506 int ret;
507
508 while (n) {
509 path = rb_entry(n, struct ipoib_path, rb_node);
510
511 ret = memcmp(gid, path->pathrec.dgid.raw,
512 sizeof (union ib_gid));
513
514 if (ret < 0)
515 n = n->rb_left;
516 else if (ret > 0)
517 n = n->rb_right;
518 else
519 return path;
520 }
521
522 return NULL;
523 }
524
525 static int __path_add(struct net_device *dev, struct ipoib_path *path)
526 {
527 struct ipoib_dev_priv *priv = netdev_priv(dev);
528 struct rb_node **n = &priv->path_tree.rb_node;
529 struct rb_node *pn = NULL;
530 struct ipoib_path *tpath;
531 int ret;
532
533 while (*n) {
534 pn = *n;
535 tpath = rb_entry(pn, struct ipoib_path, rb_node);
536
537 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
538 sizeof (union ib_gid));
539 if (ret < 0)
540 n = &pn->rb_left;
541 else if (ret > 0)
542 n = &pn->rb_right;
543 else
544 return -EEXIST;
545 }
546
547 rb_link_node(&path->rb_node, pn, n);
548 rb_insert_color(&path->rb_node, &priv->path_tree);
549
550 list_add_tail(&path->list, &priv->path_list);
551
552 return 0;
553 }
554
555 static void path_free(struct net_device *dev, struct ipoib_path *path)
556 {
557 struct sk_buff *skb;
558
559 while ((skb = __skb_dequeue(&path->queue)))
560 dev_kfree_skb_irq(skb);
561
562 ipoib_dbg(netdev_priv(dev), "path_free\n");
563
564 /* remove all neigh connected to this path */
565 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
566
567 if (path->ah)
568 ipoib_put_ah(path->ah);
569
570 kfree(path);
571 }
572
573 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
574
575 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
576 {
577 struct ipoib_path_iter *iter;
578
579 iter = kmalloc(sizeof *iter, GFP_KERNEL);
580 if (!iter)
581 return NULL;
582
583 iter->dev = dev;
584 memset(iter->path.pathrec.dgid.raw, 0, 16);
585
586 if (ipoib_path_iter_next(iter)) {
587 kfree(iter);
588 return NULL;
589 }
590
591 return iter;
592 }
593
594 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
595 {
596 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
597 struct rb_node *n;
598 struct ipoib_path *path;
599 int ret = 1;
600
601 spin_lock_irq(&priv->lock);
602
603 n = rb_first(&priv->path_tree);
604
605 while (n) {
606 path = rb_entry(n, struct ipoib_path, rb_node);
607
608 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
609 sizeof (union ib_gid)) < 0) {
610 iter->path = *path;
611 ret = 0;
612 break;
613 }
614
615 n = rb_next(n);
616 }
617
618 spin_unlock_irq(&priv->lock);
619
620 return ret;
621 }
622
623 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
624 struct ipoib_path *path)
625 {
626 *path = iter->path;
627 }
628
629 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
630
631 void ipoib_mark_paths_invalid(struct net_device *dev)
632 {
633 struct ipoib_dev_priv *priv = netdev_priv(dev);
634 struct ipoib_path *path, *tp;
635
636 spin_lock_irq(&priv->lock);
637
638 list_for_each_entry_safe(path, tp, &priv->path_list, list) {
639 ipoib_dbg(priv, "mark path LID 0x%04x GID %pI6 invalid\n",
640 be16_to_cpu(path->pathrec.dlid),
641 path->pathrec.dgid.raw);
642 path->valid = 0;
643 }
644
645 spin_unlock_irq(&priv->lock);
646 }
647
648 struct classport_info_context {
649 struct ipoib_dev_priv *priv;
650 struct completion done;
651 struct ib_sa_query *sa_query;
652 };
653
654 static void classport_info_query_cb(int status, struct ib_class_port_info *rec,
655 void *context)
656 {
657 struct classport_info_context *cb_ctx = context;
658 struct ipoib_dev_priv *priv;
659
660 WARN_ON(!context);
661
662 priv = cb_ctx->priv;
663
664 if (status || !rec) {
665 pr_debug("device: %s failed query classport_info status: %d\n",
666 priv->dev->name, status);
667 /* keeps the default, will try next mcast_restart */
668 priv->sm_fullmember_sendonly_support = false;
669 goto out;
670 }
671
672 if (ib_get_cpi_capmask2(rec) &
673 IB_SA_CAP_MASK2_SENDONLY_FULL_MEM_SUPPORT) {
674 pr_debug("device: %s enabled fullmember-sendonly for sendonly MCG\n",
675 priv->dev->name);
676 priv->sm_fullmember_sendonly_support = true;
677 } else {
678 pr_debug("device: %s disabled fullmember-sendonly for sendonly MCG\n",
679 priv->dev->name);
680 priv->sm_fullmember_sendonly_support = false;
681 }
682
683 out:
684 complete(&cb_ctx->done);
685 }
686
687 int ipoib_check_sm_sendonly_fullmember_support(struct ipoib_dev_priv *priv)
688 {
689 struct classport_info_context *callback_context;
690 int ret;
691
692 callback_context = kmalloc(sizeof(*callback_context), GFP_KERNEL);
693 if (!callback_context)
694 return -ENOMEM;
695
696 callback_context->priv = priv;
697 init_completion(&callback_context->done);
698
699 ret = ib_sa_classport_info_rec_query(&ipoib_sa_client,
700 priv->ca, priv->port, 3000,
701 GFP_KERNEL,
702 classport_info_query_cb,
703 callback_context,
704 &callback_context->sa_query);
705 if (ret < 0) {
706 pr_info("%s failed to send ib_sa_classport_info query, ret: %d\n",
707 priv->dev->name, ret);
708 kfree(callback_context);
709 return ret;
710 }
711
712 /* waiting for the callback to finish before returnning */
713 wait_for_completion(&callback_context->done);
714 kfree(callback_context);
715
716 return ret;
717 }
718
719 void ipoib_flush_paths(struct net_device *dev)
720 {
721 struct ipoib_dev_priv *priv = netdev_priv(dev);
722 struct ipoib_path *path, *tp;
723 LIST_HEAD(remove_list);
724 unsigned long flags;
725
726 netif_tx_lock_bh(dev);
727 spin_lock_irqsave(&priv->lock, flags);
728
729 list_splice_init(&priv->path_list, &remove_list);
730
731 list_for_each_entry(path, &remove_list, list)
732 rb_erase(&path->rb_node, &priv->path_tree);
733
734 list_for_each_entry_safe(path, tp, &remove_list, list) {
735 if (path->query)
736 ib_sa_cancel_query(path->query_id, path->query);
737 spin_unlock_irqrestore(&priv->lock, flags);
738 netif_tx_unlock_bh(dev);
739 wait_for_completion(&path->done);
740 path_free(dev, path);
741 netif_tx_lock_bh(dev);
742 spin_lock_irqsave(&priv->lock, flags);
743 }
744
745 spin_unlock_irqrestore(&priv->lock, flags);
746 netif_tx_unlock_bh(dev);
747 }
748
749 static void path_rec_completion(int status,
750 struct ib_sa_path_rec *pathrec,
751 void *path_ptr)
752 {
753 struct ipoib_path *path = path_ptr;
754 struct net_device *dev = path->dev;
755 struct ipoib_dev_priv *priv = netdev_priv(dev);
756 struct ipoib_ah *ah = NULL;
757 struct ipoib_ah *old_ah = NULL;
758 struct ipoib_neigh *neigh, *tn;
759 struct sk_buff_head skqueue;
760 struct sk_buff *skb;
761 unsigned long flags;
762
763 if (!status)
764 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
765 be16_to_cpu(pathrec->dlid), pathrec->dgid.raw);
766 else
767 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
768 status, path->pathrec.dgid.raw);
769
770 skb_queue_head_init(&skqueue);
771
772 if (!status) {
773 struct ib_ah_attr av;
774
775 if (!ib_init_ah_from_path(priv->ca, priv->port, pathrec, &av))
776 ah = ipoib_create_ah(dev, priv->pd, &av);
777 }
778
779 spin_lock_irqsave(&priv->lock, flags);
780
781 if (!IS_ERR_OR_NULL(ah)) {
782 path->pathrec = *pathrec;
783
784 old_ah = path->ah;
785 path->ah = ah;
786
787 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
788 ah, be16_to_cpu(pathrec->dlid), pathrec->sl);
789
790 while ((skb = __skb_dequeue(&path->queue)))
791 __skb_queue_tail(&skqueue, skb);
792
793 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
794 if (neigh->ah) {
795 WARN_ON(neigh->ah != old_ah);
796 /*
797 * Dropping the ah reference inside
798 * priv->lock is safe here, because we
799 * will hold one more reference from
800 * the original value of path->ah (ie
801 * old_ah).
802 */
803 ipoib_put_ah(neigh->ah);
804 }
805 kref_get(&path->ah->ref);
806 neigh->ah = path->ah;
807
808 if (ipoib_cm_enabled(dev, neigh->daddr)) {
809 if (!ipoib_cm_get(neigh))
810 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
811 path,
812 neigh));
813 if (!ipoib_cm_get(neigh)) {
814 ipoib_neigh_free(neigh);
815 continue;
816 }
817 }
818
819 while ((skb = __skb_dequeue(&neigh->queue)))
820 __skb_queue_tail(&skqueue, skb);
821 }
822 path->valid = 1;
823 }
824
825 path->query = NULL;
826 complete(&path->done);
827
828 spin_unlock_irqrestore(&priv->lock, flags);
829
830 if (IS_ERR_OR_NULL(ah))
831 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
832
833 if (old_ah)
834 ipoib_put_ah(old_ah);
835
836 while ((skb = __skb_dequeue(&skqueue))) {
837 skb->dev = dev;
838 if (dev_queue_xmit(skb))
839 ipoib_warn(priv, "dev_queue_xmit failed "
840 "to requeue packet\n");
841 }
842 }
843
844 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
845 {
846 struct ipoib_dev_priv *priv = netdev_priv(dev);
847 struct ipoib_path *path;
848
849 if (!priv->broadcast)
850 return NULL;
851
852 path = kzalloc(sizeof *path, GFP_ATOMIC);
853 if (!path)
854 return NULL;
855
856 path->dev = dev;
857
858 skb_queue_head_init(&path->queue);
859
860 INIT_LIST_HEAD(&path->neigh_list);
861
862 memcpy(path->pathrec.dgid.raw, gid, sizeof (union ib_gid));
863 path->pathrec.sgid = priv->local_gid;
864 path->pathrec.pkey = cpu_to_be16(priv->pkey);
865 path->pathrec.numb_path = 1;
866 path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
867
868 return path;
869 }
870
871 static int path_rec_start(struct net_device *dev,
872 struct ipoib_path *path)
873 {
874 struct ipoib_dev_priv *priv = netdev_priv(dev);
875
876 ipoib_dbg(priv, "Start path record lookup for %pI6\n",
877 path->pathrec.dgid.raw);
878
879 init_completion(&path->done);
880
881 path->query_id =
882 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
883 &path->pathrec,
884 IB_SA_PATH_REC_DGID |
885 IB_SA_PATH_REC_SGID |
886 IB_SA_PATH_REC_NUMB_PATH |
887 IB_SA_PATH_REC_TRAFFIC_CLASS |
888 IB_SA_PATH_REC_PKEY,
889 1000, GFP_ATOMIC,
890 path_rec_completion,
891 path, &path->query);
892 if (path->query_id < 0) {
893 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
894 path->query = NULL;
895 complete(&path->done);
896 return path->query_id;
897 }
898
899 return 0;
900 }
901
902 static void neigh_add_path(struct sk_buff *skb, u8 *daddr,
903 struct net_device *dev)
904 {
905 struct ipoib_dev_priv *priv = netdev_priv(dev);
906 struct ipoib_path *path;
907 struct ipoib_neigh *neigh;
908 unsigned long flags;
909
910 spin_lock_irqsave(&priv->lock, flags);
911 neigh = ipoib_neigh_alloc(daddr, dev);
912 if (!neigh) {
913 spin_unlock_irqrestore(&priv->lock, flags);
914 ++dev->stats.tx_dropped;
915 dev_kfree_skb_any(skb);
916 return;
917 }
918
919 path = __path_find(dev, daddr + 4);
920 if (!path) {
921 path = path_rec_create(dev, daddr + 4);
922 if (!path)
923 goto err_path;
924
925 __path_add(dev, path);
926 }
927
928 list_add_tail(&neigh->list, &path->neigh_list);
929
930 if (path->ah) {
931 kref_get(&path->ah->ref);
932 neigh->ah = path->ah;
933
934 if (ipoib_cm_enabled(dev, neigh->daddr)) {
935 if (!ipoib_cm_get(neigh))
936 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
937 if (!ipoib_cm_get(neigh)) {
938 ipoib_neigh_free(neigh);
939 goto err_drop;
940 }
941 if (skb_queue_len(&neigh->queue) <
942 IPOIB_MAX_PATH_REC_QUEUE) {
943 /* put pseudoheader back on for next time */
944 skb_push(skb, IPOIB_PSEUDO_LEN);
945 __skb_queue_tail(&neigh->queue, skb);
946 } else {
947 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
948 skb_queue_len(&neigh->queue));
949 goto err_drop;
950 }
951 } else {
952 spin_unlock_irqrestore(&priv->lock, flags);
953 ipoib_send(dev, skb, path->ah, IPOIB_QPN(daddr));
954 ipoib_neigh_put(neigh);
955 return;
956 }
957 } else {
958 neigh->ah = NULL;
959
960 if (!path->query && path_rec_start(dev, path))
961 goto err_path;
962 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE)
963 __skb_queue_tail(&neigh->queue, skb);
964 else
965 goto err_drop;
966 }
967
968 spin_unlock_irqrestore(&priv->lock, flags);
969 ipoib_neigh_put(neigh);
970 return;
971
972 err_path:
973 ipoib_neigh_free(neigh);
974 err_drop:
975 ++dev->stats.tx_dropped;
976 dev_kfree_skb_any(skb);
977
978 spin_unlock_irqrestore(&priv->lock, flags);
979 ipoib_neigh_put(neigh);
980 }
981
982 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
983 struct ipoib_pseudo_header *phdr)
984 {
985 struct ipoib_dev_priv *priv = netdev_priv(dev);
986 struct ipoib_path *path;
987 unsigned long flags;
988
989 spin_lock_irqsave(&priv->lock, flags);
990
991 path = __path_find(dev, phdr->hwaddr + 4);
992 if (!path || !path->valid) {
993 int new_path = 0;
994
995 if (!path) {
996 path = path_rec_create(dev, phdr->hwaddr + 4);
997 new_path = 1;
998 }
999 if (path) {
1000 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1001 /* put pseudoheader back on for next time */
1002 skb_push(skb, IPOIB_PSEUDO_LEN);
1003 __skb_queue_tail(&path->queue, skb);
1004 } else {
1005 ++dev->stats.tx_dropped;
1006 dev_kfree_skb_any(skb);
1007 }
1008
1009 if (!path->query && path_rec_start(dev, path)) {
1010 spin_unlock_irqrestore(&priv->lock, flags);
1011 if (new_path)
1012 path_free(dev, path);
1013 return;
1014 } else
1015 __path_add(dev, path);
1016 } else {
1017 ++dev->stats.tx_dropped;
1018 dev_kfree_skb_any(skb);
1019 }
1020
1021 spin_unlock_irqrestore(&priv->lock, flags);
1022 return;
1023 }
1024
1025 if (path->ah) {
1026 ipoib_dbg(priv, "Send unicast ARP to %04x\n",
1027 be16_to_cpu(path->pathrec.dlid));
1028
1029 spin_unlock_irqrestore(&priv->lock, flags);
1030 ipoib_send(dev, skb, path->ah, IPOIB_QPN(phdr->hwaddr));
1031 return;
1032 } else if ((path->query || !path_rec_start(dev, path)) &&
1033 skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1034 /* put pseudoheader back on for next time */
1035 skb_push(skb, IPOIB_PSEUDO_LEN);
1036 __skb_queue_tail(&path->queue, skb);
1037 } else {
1038 ++dev->stats.tx_dropped;
1039 dev_kfree_skb_any(skb);
1040 }
1041
1042 spin_unlock_irqrestore(&priv->lock, flags);
1043 }
1044
1045 static int ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
1046 {
1047 struct ipoib_dev_priv *priv = netdev_priv(dev);
1048 struct ipoib_neigh *neigh;
1049 struct ipoib_pseudo_header *phdr;
1050 struct ipoib_header *header;
1051 unsigned long flags;
1052
1053 phdr = (struct ipoib_pseudo_header *) skb->data;
1054 skb_pull(skb, sizeof(*phdr));
1055 header = (struct ipoib_header *) skb->data;
1056
1057 if (unlikely(phdr->hwaddr[4] == 0xff)) {
1058 /* multicast, arrange "if" according to probability */
1059 if ((header->proto != htons(ETH_P_IP)) &&
1060 (header->proto != htons(ETH_P_IPV6)) &&
1061 (header->proto != htons(ETH_P_ARP)) &&
1062 (header->proto != htons(ETH_P_RARP)) &&
1063 (header->proto != htons(ETH_P_TIPC))) {
1064 /* ethertype not supported by IPoIB */
1065 ++dev->stats.tx_dropped;
1066 dev_kfree_skb_any(skb);
1067 return NETDEV_TX_OK;
1068 }
1069 /* Add in the P_Key for multicast*/
1070 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
1071 phdr->hwaddr[9] = priv->pkey & 0xff;
1072
1073 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1074 if (likely(neigh))
1075 goto send_using_neigh;
1076 ipoib_mcast_send(dev, phdr->hwaddr, skb);
1077 return NETDEV_TX_OK;
1078 }
1079
1080 /* unicast, arrange "switch" according to probability */
1081 switch (header->proto) {
1082 case htons(ETH_P_IP):
1083 case htons(ETH_P_IPV6):
1084 case htons(ETH_P_TIPC):
1085 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1086 if (unlikely(!neigh)) {
1087 neigh_add_path(skb, phdr->hwaddr, dev);
1088 return NETDEV_TX_OK;
1089 }
1090 break;
1091 case htons(ETH_P_ARP):
1092 case htons(ETH_P_RARP):
1093 /* for unicast ARP and RARP should always perform path find */
1094 unicast_arp_send(skb, dev, phdr);
1095 return NETDEV_TX_OK;
1096 default:
1097 /* ethertype not supported by IPoIB */
1098 ++dev->stats.tx_dropped;
1099 dev_kfree_skb_any(skb);
1100 return NETDEV_TX_OK;
1101 }
1102
1103 send_using_neigh:
1104 /* note we now hold a ref to neigh */
1105 if (ipoib_cm_get(neigh)) {
1106 if (ipoib_cm_up(neigh)) {
1107 ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1108 goto unref;
1109 }
1110 } else if (neigh->ah) {
1111 ipoib_send(dev, skb, neigh->ah, IPOIB_QPN(phdr->hwaddr));
1112 goto unref;
1113 }
1114
1115 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1116 /* put pseudoheader back on for next time */
1117 skb_push(skb, sizeof(*phdr));
1118 spin_lock_irqsave(&priv->lock, flags);
1119 __skb_queue_tail(&neigh->queue, skb);
1120 spin_unlock_irqrestore(&priv->lock, flags);
1121 } else {
1122 ++dev->stats.tx_dropped;
1123 dev_kfree_skb_any(skb);
1124 }
1125
1126 unref:
1127 ipoib_neigh_put(neigh);
1128
1129 return NETDEV_TX_OK;
1130 }
1131
1132 static void ipoib_timeout(struct net_device *dev)
1133 {
1134 struct ipoib_dev_priv *priv = netdev_priv(dev);
1135
1136 ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1137 jiffies_to_msecs(jiffies - dev_trans_start(dev)));
1138 ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
1139 netif_queue_stopped(dev),
1140 priv->tx_head, priv->tx_tail);
1141 /* XXX reset QP, etc. */
1142 }
1143
1144 static int ipoib_hard_header(struct sk_buff *skb,
1145 struct net_device *dev,
1146 unsigned short type,
1147 const void *daddr, const void *saddr, unsigned len)
1148 {
1149 struct ipoib_pseudo_header *phdr;
1150 struct ipoib_header *header;
1151
1152 header = (struct ipoib_header *) skb_push(skb, sizeof *header);
1153
1154 header->proto = htons(type);
1155 header->reserved = 0;
1156
1157 /*
1158 * we don't rely on dst_entry structure, always stuff the
1159 * destination address into skb hard header so we can figure out where
1160 * to send the packet later.
1161 */
1162 phdr = (struct ipoib_pseudo_header *) skb_push(skb, sizeof(*phdr));
1163 memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
1164
1165 return IPOIB_HARD_LEN;
1166 }
1167
1168 static void ipoib_set_mcast_list(struct net_device *dev)
1169 {
1170 struct ipoib_dev_priv *priv = netdev_priv(dev);
1171
1172 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1173 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1174 return;
1175 }
1176
1177 queue_work(priv->wq, &priv->restart_task);
1178 }
1179
1180 static int ipoib_get_iflink(const struct net_device *dev)
1181 {
1182 struct ipoib_dev_priv *priv = netdev_priv(dev);
1183
1184 /* parent interface */
1185 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1186 return dev->ifindex;
1187
1188 /* child/vlan interface */
1189 return priv->parent->ifindex;
1190 }
1191
1192 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1193 {
1194 /*
1195 * Use only the address parts that contributes to spreading
1196 * The subnet prefix is not used as one can not connect to
1197 * same remote port (GUID) using the same remote QPN via two
1198 * different subnets.
1199 */
1200 /* qpn octets[1:4) & port GUID octets[12:20) */
1201 u32 *d32 = (u32 *) daddr;
1202 u32 hv;
1203
1204 hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1205 return hv & htbl->mask;
1206 }
1207
1208 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1209 {
1210 struct ipoib_dev_priv *priv = netdev_priv(dev);
1211 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1212 struct ipoib_neigh_hash *htbl;
1213 struct ipoib_neigh *neigh = NULL;
1214 u32 hash_val;
1215
1216 rcu_read_lock_bh();
1217
1218 htbl = rcu_dereference_bh(ntbl->htbl);
1219
1220 if (!htbl)
1221 goto out_unlock;
1222
1223 hash_val = ipoib_addr_hash(htbl, daddr);
1224 for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1225 neigh != NULL;
1226 neigh = rcu_dereference_bh(neigh->hnext)) {
1227 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1228 /* found, take one ref on behalf of the caller */
1229 if (!atomic_inc_not_zero(&neigh->refcnt)) {
1230 /* deleted */
1231 neigh = NULL;
1232 goto out_unlock;
1233 }
1234
1235 if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
1236 neigh->alive = jiffies;
1237 goto out_unlock;
1238 }
1239 }
1240
1241 out_unlock:
1242 rcu_read_unlock_bh();
1243 return neigh;
1244 }
1245
1246 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1247 {
1248 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1249 struct ipoib_neigh_hash *htbl;
1250 unsigned long neigh_obsolete;
1251 unsigned long dt;
1252 unsigned long flags;
1253 int i;
1254 LIST_HEAD(remove_list);
1255
1256 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1257 return;
1258
1259 spin_lock_irqsave(&priv->lock, flags);
1260
1261 htbl = rcu_dereference_protected(ntbl->htbl,
1262 lockdep_is_held(&priv->lock));
1263
1264 if (!htbl)
1265 goto out_unlock;
1266
1267 /* neigh is obsolete if it was idle for two GC periods */
1268 dt = 2 * arp_tbl.gc_interval;
1269 neigh_obsolete = jiffies - dt;
1270 /* handle possible race condition */
1271 if (test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1272 goto out_unlock;
1273
1274 for (i = 0; i < htbl->size; i++) {
1275 struct ipoib_neigh *neigh;
1276 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1277
1278 while ((neigh = rcu_dereference_protected(*np,
1279 lockdep_is_held(&priv->lock))) != NULL) {
1280 /* was the neigh idle for two GC periods */
1281 if (time_after(neigh_obsolete, neigh->alive)) {
1282
1283 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1284
1285 rcu_assign_pointer(*np,
1286 rcu_dereference_protected(neigh->hnext,
1287 lockdep_is_held(&priv->lock)));
1288 /* remove from path/mc list */
1289 list_del(&neigh->list);
1290 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1291 } else {
1292 np = &neigh->hnext;
1293 }
1294
1295 }
1296 }
1297
1298 out_unlock:
1299 spin_unlock_irqrestore(&priv->lock, flags);
1300 ipoib_mcast_remove_list(&remove_list);
1301 }
1302
1303 static void ipoib_reap_neigh(struct work_struct *work)
1304 {
1305 struct ipoib_dev_priv *priv =
1306 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1307
1308 __ipoib_reap_neigh(priv);
1309
1310 if (!test_bit(IPOIB_STOP_NEIGH_GC, &priv->flags))
1311 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1312 arp_tbl.gc_interval);
1313 }
1314
1315
1316 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1317 struct net_device *dev)
1318 {
1319 struct ipoib_neigh *neigh;
1320
1321 neigh = kzalloc(sizeof *neigh, GFP_ATOMIC);
1322 if (!neigh)
1323 return NULL;
1324
1325 neigh->dev = dev;
1326 memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1327 skb_queue_head_init(&neigh->queue);
1328 INIT_LIST_HEAD(&neigh->list);
1329 ipoib_cm_set(neigh, NULL);
1330 /* one ref on behalf of the caller */
1331 atomic_set(&neigh->refcnt, 1);
1332
1333 return neigh;
1334 }
1335
1336 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1337 struct net_device *dev)
1338 {
1339 struct ipoib_dev_priv *priv = netdev_priv(dev);
1340 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1341 struct ipoib_neigh_hash *htbl;
1342 struct ipoib_neigh *neigh;
1343 u32 hash_val;
1344
1345 htbl = rcu_dereference_protected(ntbl->htbl,
1346 lockdep_is_held(&priv->lock));
1347 if (!htbl) {
1348 neigh = NULL;
1349 goto out_unlock;
1350 }
1351
1352 /* need to add a new neigh, but maybe some other thread succeeded?
1353 * recalc hash, maybe hash resize took place so we do a search
1354 */
1355 hash_val = ipoib_addr_hash(htbl, daddr);
1356 for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1357 lockdep_is_held(&priv->lock));
1358 neigh != NULL;
1359 neigh = rcu_dereference_protected(neigh->hnext,
1360 lockdep_is_held(&priv->lock))) {
1361 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1362 /* found, take one ref on behalf of the caller */
1363 if (!atomic_inc_not_zero(&neigh->refcnt)) {
1364 /* deleted */
1365 neigh = NULL;
1366 break;
1367 }
1368 neigh->alive = jiffies;
1369 goto out_unlock;
1370 }
1371 }
1372
1373 neigh = ipoib_neigh_ctor(daddr, dev);
1374 if (!neigh)
1375 goto out_unlock;
1376
1377 /* one ref on behalf of the hash table */
1378 atomic_inc(&neigh->refcnt);
1379 neigh->alive = jiffies;
1380 /* put in hash */
1381 rcu_assign_pointer(neigh->hnext,
1382 rcu_dereference_protected(htbl->buckets[hash_val],
1383 lockdep_is_held(&priv->lock)));
1384 rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1385 atomic_inc(&ntbl->entries);
1386
1387 out_unlock:
1388
1389 return neigh;
1390 }
1391
1392 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1393 {
1394 /* neigh reference count was dropprd to zero */
1395 struct net_device *dev = neigh->dev;
1396 struct ipoib_dev_priv *priv = netdev_priv(dev);
1397 struct sk_buff *skb;
1398 if (neigh->ah)
1399 ipoib_put_ah(neigh->ah);
1400 while ((skb = __skb_dequeue(&neigh->queue))) {
1401 ++dev->stats.tx_dropped;
1402 dev_kfree_skb_any(skb);
1403 }
1404 if (ipoib_cm_get(neigh))
1405 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1406 ipoib_dbg(netdev_priv(dev),
1407 "neigh free for %06x %pI6\n",
1408 IPOIB_QPN(neigh->daddr),
1409 neigh->daddr + 4);
1410 kfree(neigh);
1411 if (atomic_dec_and_test(&priv->ntbl.entries)) {
1412 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1413 complete(&priv->ntbl.flushed);
1414 }
1415 }
1416
1417 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1418 {
1419 /* Called as a result of removal from hash table */
1420 struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1421 /* note TX context may hold another ref */
1422 ipoib_neigh_put(neigh);
1423 }
1424
1425 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1426 {
1427 struct net_device *dev = neigh->dev;
1428 struct ipoib_dev_priv *priv = netdev_priv(dev);
1429 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1430 struct ipoib_neigh_hash *htbl;
1431 struct ipoib_neigh __rcu **np;
1432 struct ipoib_neigh *n;
1433 u32 hash_val;
1434
1435 htbl = rcu_dereference_protected(ntbl->htbl,
1436 lockdep_is_held(&priv->lock));
1437 if (!htbl)
1438 return;
1439
1440 hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1441 np = &htbl->buckets[hash_val];
1442 for (n = rcu_dereference_protected(*np,
1443 lockdep_is_held(&priv->lock));
1444 n != NULL;
1445 n = rcu_dereference_protected(*np,
1446 lockdep_is_held(&priv->lock))) {
1447 if (n == neigh) {
1448 /* found */
1449 rcu_assign_pointer(*np,
1450 rcu_dereference_protected(neigh->hnext,
1451 lockdep_is_held(&priv->lock)));
1452 /* remove from parent list */
1453 list_del(&neigh->list);
1454 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1455 return;
1456 } else {
1457 np = &n->hnext;
1458 }
1459 }
1460 }
1461
1462 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1463 {
1464 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1465 struct ipoib_neigh_hash *htbl;
1466 struct ipoib_neigh __rcu **buckets;
1467 u32 size;
1468
1469 clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1470 ntbl->htbl = NULL;
1471 htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1472 if (!htbl)
1473 return -ENOMEM;
1474 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1475 size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1476 buckets = kzalloc(size * sizeof(*buckets), GFP_KERNEL);
1477 if (!buckets) {
1478 kfree(htbl);
1479 return -ENOMEM;
1480 }
1481 htbl->size = size;
1482 htbl->mask = (size - 1);
1483 htbl->buckets = buckets;
1484 RCU_INIT_POINTER(ntbl->htbl, htbl);
1485 htbl->ntbl = ntbl;
1486 atomic_set(&ntbl->entries, 0);
1487
1488 /* start garbage collection */
1489 clear_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1490 queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1491 arp_tbl.gc_interval);
1492
1493 return 0;
1494 }
1495
1496 static void neigh_hash_free_rcu(struct rcu_head *head)
1497 {
1498 struct ipoib_neigh_hash *htbl = container_of(head,
1499 struct ipoib_neigh_hash,
1500 rcu);
1501 struct ipoib_neigh __rcu **buckets = htbl->buckets;
1502 struct ipoib_neigh_table *ntbl = htbl->ntbl;
1503
1504 kfree(buckets);
1505 kfree(htbl);
1506 complete(&ntbl->deleted);
1507 }
1508
1509 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1510 {
1511 struct ipoib_dev_priv *priv = netdev_priv(dev);
1512 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1513 struct ipoib_neigh_hash *htbl;
1514 unsigned long flags;
1515 int i;
1516
1517 /* remove all neigh connected to a given path or mcast */
1518 spin_lock_irqsave(&priv->lock, flags);
1519
1520 htbl = rcu_dereference_protected(ntbl->htbl,
1521 lockdep_is_held(&priv->lock));
1522
1523 if (!htbl)
1524 goto out_unlock;
1525
1526 for (i = 0; i < htbl->size; i++) {
1527 struct ipoib_neigh *neigh;
1528 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1529
1530 while ((neigh = rcu_dereference_protected(*np,
1531 lockdep_is_held(&priv->lock))) != NULL) {
1532 /* delete neighs belong to this parent */
1533 if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1534 rcu_assign_pointer(*np,
1535 rcu_dereference_protected(neigh->hnext,
1536 lockdep_is_held(&priv->lock)));
1537 /* remove from parent list */
1538 list_del(&neigh->list);
1539 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1540 } else {
1541 np = &neigh->hnext;
1542 }
1543
1544 }
1545 }
1546 out_unlock:
1547 spin_unlock_irqrestore(&priv->lock, flags);
1548 }
1549
1550 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1551 {
1552 struct ipoib_neigh_table *ntbl = &priv->ntbl;
1553 struct ipoib_neigh_hash *htbl;
1554 unsigned long flags;
1555 int i, wait_flushed = 0;
1556
1557 init_completion(&priv->ntbl.flushed);
1558
1559 spin_lock_irqsave(&priv->lock, flags);
1560
1561 htbl = rcu_dereference_protected(ntbl->htbl,
1562 lockdep_is_held(&priv->lock));
1563 if (!htbl)
1564 goto out_unlock;
1565
1566 wait_flushed = atomic_read(&priv->ntbl.entries);
1567 if (!wait_flushed)
1568 goto free_htbl;
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 rcu_assign_pointer(*np,
1577 rcu_dereference_protected(neigh->hnext,
1578 lockdep_is_held(&priv->lock)));
1579 /* remove from path/mc list */
1580 list_del(&neigh->list);
1581 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1582 }
1583 }
1584
1585 free_htbl:
1586 rcu_assign_pointer(ntbl->htbl, NULL);
1587 call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1588
1589 out_unlock:
1590 spin_unlock_irqrestore(&priv->lock, flags);
1591 if (wait_flushed)
1592 wait_for_completion(&priv->ntbl.flushed);
1593 }
1594
1595 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1596 {
1597 struct ipoib_dev_priv *priv = netdev_priv(dev);
1598 int stopped;
1599
1600 ipoib_dbg(priv, "ipoib_neigh_hash_uninit\n");
1601 init_completion(&priv->ntbl.deleted);
1602 set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1603
1604 /* Stop GC if called at init fail need to cancel work */
1605 stopped = test_and_set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
1606 if (!stopped)
1607 cancel_delayed_work(&priv->neigh_reap_task);
1608
1609 ipoib_flush_neighs(priv);
1610
1611 wait_for_completion(&priv->ntbl.deleted);
1612 }
1613
1614
1615 int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
1616 {
1617 struct ipoib_dev_priv *priv = netdev_priv(dev);
1618
1619 /* Allocate RX/TX "rings" to hold queued skbs */
1620 priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
1621 GFP_KERNEL);
1622 if (!priv->rx_ring)
1623 goto out;
1624
1625 priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
1626 if (!priv->tx_ring) {
1627 printk(KERN_WARNING "%s: failed to allocate TX ring (%d entries)\n",
1628 ca->name, ipoib_sendq_size);
1629 goto out_rx_ring_cleanup;
1630 }
1631
1632 /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1633
1634 if (ipoib_ib_dev_init(dev, ca, port))
1635 goto out_tx_ring_cleanup;
1636
1637 /*
1638 * Must be after ipoib_ib_dev_init so we can allocate a per
1639 * device wq there and use it here
1640 */
1641 if (ipoib_neigh_hash_init(priv) < 0)
1642 goto out_dev_uninit;
1643
1644 return 0;
1645
1646 out_dev_uninit:
1647 ipoib_ib_dev_cleanup(dev);
1648
1649 out_tx_ring_cleanup:
1650 vfree(priv->tx_ring);
1651
1652 out_rx_ring_cleanup:
1653 kfree(priv->rx_ring);
1654
1655 out:
1656 return -ENOMEM;
1657 }
1658
1659 void ipoib_dev_cleanup(struct net_device *dev)
1660 {
1661 struct ipoib_dev_priv *priv = netdev_priv(dev), *cpriv, *tcpriv;
1662 LIST_HEAD(head);
1663
1664 ASSERT_RTNL();
1665
1666 ipoib_delete_debug_files(dev);
1667
1668 /* Delete any child interfaces first */
1669 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
1670 /* Stop GC on child */
1671 set_bit(IPOIB_STOP_NEIGH_GC, &cpriv->flags);
1672 cancel_delayed_work(&cpriv->neigh_reap_task);
1673 unregister_netdevice_queue(cpriv->dev, &head);
1674 }
1675 unregister_netdevice_many(&head);
1676
1677 /*
1678 * Must be before ipoib_ib_dev_cleanup or we delete an in use
1679 * work queue
1680 */
1681 ipoib_neigh_hash_uninit(dev);
1682
1683 ipoib_ib_dev_cleanup(dev);
1684
1685 kfree(priv->rx_ring);
1686 vfree(priv->tx_ring);
1687
1688 priv->rx_ring = NULL;
1689 priv->tx_ring = NULL;
1690 }
1691
1692 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
1693 {
1694 struct ipoib_dev_priv *priv = netdev_priv(dev);
1695
1696 return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
1697 }
1698
1699 static int ipoib_get_vf_config(struct net_device *dev, int vf,
1700 struct ifla_vf_info *ivf)
1701 {
1702 struct ipoib_dev_priv *priv = netdev_priv(dev);
1703 int err;
1704
1705 err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
1706 if (err)
1707 return err;
1708
1709 ivf->vf = vf;
1710
1711 return 0;
1712 }
1713
1714 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
1715 {
1716 struct ipoib_dev_priv *priv = netdev_priv(dev);
1717
1718 if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
1719 return -EINVAL;
1720
1721 return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
1722 }
1723
1724 static int ipoib_get_vf_stats(struct net_device *dev, int vf,
1725 struct ifla_vf_stats *vf_stats)
1726 {
1727 struct ipoib_dev_priv *priv = netdev_priv(dev);
1728
1729 return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
1730 }
1731
1732 static const struct header_ops ipoib_header_ops = {
1733 .create = ipoib_hard_header,
1734 };
1735
1736 static const struct net_device_ops ipoib_netdev_ops_pf = {
1737 .ndo_uninit = ipoib_uninit,
1738 .ndo_open = ipoib_open,
1739 .ndo_stop = ipoib_stop,
1740 .ndo_change_mtu = ipoib_change_mtu,
1741 .ndo_fix_features = ipoib_fix_features,
1742 .ndo_start_xmit = ipoib_start_xmit,
1743 .ndo_tx_timeout = ipoib_timeout,
1744 .ndo_set_rx_mode = ipoib_set_mcast_list,
1745 .ndo_get_iflink = ipoib_get_iflink,
1746 .ndo_set_vf_link_state = ipoib_set_vf_link_state,
1747 .ndo_get_vf_config = ipoib_get_vf_config,
1748 .ndo_get_vf_stats = ipoib_get_vf_stats,
1749 .ndo_set_vf_guid = ipoib_set_vf_guid,
1750 .ndo_set_mac_address = ipoib_set_mac,
1751 };
1752
1753 static const struct net_device_ops ipoib_netdev_ops_vf = {
1754 .ndo_uninit = ipoib_uninit,
1755 .ndo_open = ipoib_open,
1756 .ndo_stop = ipoib_stop,
1757 .ndo_change_mtu = ipoib_change_mtu,
1758 .ndo_fix_features = ipoib_fix_features,
1759 .ndo_start_xmit = ipoib_start_xmit,
1760 .ndo_tx_timeout = ipoib_timeout,
1761 .ndo_set_rx_mode = ipoib_set_mcast_list,
1762 .ndo_get_iflink = ipoib_get_iflink,
1763 };
1764
1765 void ipoib_setup(struct net_device *dev)
1766 {
1767 struct ipoib_dev_priv *priv = netdev_priv(dev);
1768
1769 if (priv->hca_caps & IB_DEVICE_VIRTUAL_FUNCTION)
1770 dev->netdev_ops = &ipoib_netdev_ops_vf;
1771 else
1772 dev->netdev_ops = &ipoib_netdev_ops_pf;
1773
1774 dev->header_ops = &ipoib_header_ops;
1775
1776 ipoib_set_ethtool_ops(dev);
1777
1778 netif_napi_add(dev, &priv->napi, ipoib_poll, NAPI_POLL_WEIGHT);
1779
1780 dev->watchdog_timeo = HZ;
1781
1782 dev->flags |= IFF_BROADCAST | IFF_MULTICAST;
1783
1784 dev->hard_header_len = IPOIB_HARD_LEN;
1785 dev->addr_len = INFINIBAND_ALEN;
1786 dev->type = ARPHRD_INFINIBAND;
1787 dev->tx_queue_len = ipoib_sendq_size * 2;
1788 dev->features = (NETIF_F_VLAN_CHALLENGED |
1789 NETIF_F_HIGHDMA);
1790 netif_keep_dst(dev);
1791
1792 memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
1793
1794 priv->dev = dev;
1795
1796 spin_lock_init(&priv->lock);
1797
1798 init_rwsem(&priv->vlan_rwsem);
1799
1800 INIT_LIST_HEAD(&priv->path_list);
1801 INIT_LIST_HEAD(&priv->child_intfs);
1802 INIT_LIST_HEAD(&priv->dead_ahs);
1803 INIT_LIST_HEAD(&priv->multicast_list);
1804
1805 INIT_DELAYED_WORK(&priv->mcast_task, ipoib_mcast_join_task);
1806 INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
1807 INIT_WORK(&priv->flush_light, ipoib_ib_dev_flush_light);
1808 INIT_WORK(&priv->flush_normal, ipoib_ib_dev_flush_normal);
1809 INIT_WORK(&priv->flush_heavy, ipoib_ib_dev_flush_heavy);
1810 INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
1811 INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
1812 INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
1813 }
1814
1815 struct ipoib_dev_priv *ipoib_intf_alloc(const char *name)
1816 {
1817 struct net_device *dev;
1818
1819 dev = alloc_netdev((int)sizeof(struct ipoib_dev_priv), name,
1820 NET_NAME_UNKNOWN, ipoib_setup);
1821 if (!dev)
1822 return NULL;
1823
1824 return netdev_priv(dev);
1825 }
1826
1827 static ssize_t show_pkey(struct device *dev,
1828 struct device_attribute *attr, char *buf)
1829 {
1830 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1831
1832 return sprintf(buf, "0x%04x\n", priv->pkey);
1833 }
1834 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
1835
1836 static ssize_t show_umcast(struct device *dev,
1837 struct device_attribute *attr, char *buf)
1838 {
1839 struct ipoib_dev_priv *priv = netdev_priv(to_net_dev(dev));
1840
1841 return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
1842 }
1843
1844 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
1845 {
1846 struct ipoib_dev_priv *priv = netdev_priv(ndev);
1847
1848 if (umcast_val > 0) {
1849 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1850 ipoib_warn(priv, "ignoring multicast groups joined directly "
1851 "by userspace\n");
1852 } else
1853 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
1854 }
1855
1856 static ssize_t set_umcast(struct device *dev,
1857 struct device_attribute *attr,
1858 const char *buf, size_t count)
1859 {
1860 unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
1861
1862 ipoib_set_umcast(to_net_dev(dev), umcast_val);
1863
1864 return count;
1865 }
1866 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
1867
1868 int ipoib_add_umcast_attr(struct net_device *dev)
1869 {
1870 return device_create_file(&dev->dev, &dev_attr_umcast);
1871 }
1872
1873 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
1874 {
1875 struct ipoib_dev_priv *child_priv;
1876 struct net_device *netdev = priv->dev;
1877
1878 netif_addr_lock_bh(netdev);
1879
1880 memcpy(&priv->local_gid.global.interface_id,
1881 &gid->global.interface_id,
1882 sizeof(gid->global.interface_id));
1883 memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
1884 clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1885
1886 netif_addr_unlock_bh(netdev);
1887
1888 if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
1889 down_read(&priv->vlan_rwsem);
1890 list_for_each_entry(child_priv, &priv->child_intfs, list)
1891 set_base_guid(child_priv, gid);
1892 up_read(&priv->vlan_rwsem);
1893 }
1894 }
1895
1896 static int ipoib_check_lladdr(struct net_device *dev,
1897 struct sockaddr_storage *ss)
1898 {
1899 union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
1900 int ret = 0;
1901
1902 netif_addr_lock_bh(dev);
1903
1904 /* Make sure the QPN, reserved and subnet prefix match the current
1905 * lladdr, it also makes sure the lladdr is unicast.
1906 */
1907 if (memcmp(dev->dev_addr, ss->__data,
1908 4 + sizeof(gid->global.subnet_prefix)) ||
1909 gid->global.interface_id == 0)
1910 ret = -EINVAL;
1911
1912 netif_addr_unlock_bh(dev);
1913
1914 return ret;
1915 }
1916
1917 static int ipoib_set_mac(struct net_device *dev, void *addr)
1918 {
1919 struct ipoib_dev_priv *priv = netdev_priv(dev);
1920 struct sockaddr_storage *ss = addr;
1921 int ret;
1922
1923 if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
1924 return -EBUSY;
1925
1926 ret = ipoib_check_lladdr(dev, ss);
1927 if (ret)
1928 return ret;
1929
1930 set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
1931
1932 queue_work(ipoib_workqueue, &priv->flush_light);
1933
1934 return 0;
1935 }
1936
1937 static ssize_t create_child(struct device *dev,
1938 struct device_attribute *attr,
1939 const char *buf, size_t count)
1940 {
1941 int pkey;
1942 int ret;
1943
1944 if (sscanf(buf, "%i", &pkey) != 1)
1945 return -EINVAL;
1946
1947 if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
1948 return -EINVAL;
1949
1950 /*
1951 * Set the full membership bit, so that we join the right
1952 * broadcast group, etc.
1953 */
1954 pkey |= 0x8000;
1955
1956 ret = ipoib_vlan_add(to_net_dev(dev), pkey);
1957
1958 return ret ? ret : count;
1959 }
1960 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
1961
1962 static ssize_t delete_child(struct device *dev,
1963 struct device_attribute *attr,
1964 const char *buf, size_t count)
1965 {
1966 int pkey;
1967 int ret;
1968
1969 if (sscanf(buf, "%i", &pkey) != 1)
1970 return -EINVAL;
1971
1972 if (pkey < 0 || pkey > 0xffff)
1973 return -EINVAL;
1974
1975 ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
1976
1977 return ret ? ret : count;
1978
1979 }
1980 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
1981
1982 int ipoib_add_pkey_attr(struct net_device *dev)
1983 {
1984 return device_create_file(&dev->dev, &dev_attr_pkey);
1985 }
1986
1987 int ipoib_set_dev_features(struct ipoib_dev_priv *priv, struct ib_device *hca)
1988 {
1989 priv->hca_caps = hca->attrs.device_cap_flags;
1990
1991 if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1992 priv->dev->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1993
1994 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1995 priv->dev->hw_features |= NETIF_F_TSO;
1996
1997 priv->dev->features |= priv->dev->hw_features;
1998 }
1999
2000 return 0;
2001 }
2002
2003 static struct net_device *ipoib_add_port(const char *format,
2004 struct ib_device *hca, u8 port)
2005 {
2006 struct ipoib_dev_priv *priv;
2007 struct ib_port_attr attr;
2008 int result = -ENOMEM;
2009
2010 priv = ipoib_intf_alloc(format);
2011 if (!priv)
2012 goto alloc_mem_failed;
2013
2014 SET_NETDEV_DEV(priv->dev, hca->dma_device);
2015 priv->dev->dev_id = port - 1;
2016
2017 result = ib_query_port(hca, port, &attr);
2018 if (!result)
2019 priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
2020 else {
2021 printk(KERN_WARNING "%s: ib_query_port %d failed\n",
2022 hca->name, port);
2023 goto device_init_failed;
2024 }
2025
2026 /* MTU will be reset when mcast join happens */
2027 priv->dev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
2028 priv->mcast_mtu = priv->admin_mtu = priv->dev->mtu;
2029 priv->dev->max_mtu = IPOIB_CM_MTU;
2030
2031 priv->dev->neigh_priv_len = sizeof(struct ipoib_neigh);
2032
2033 result = ib_query_pkey(hca, port, 0, &priv->pkey);
2034 if (result) {
2035 printk(KERN_WARNING "%s: ib_query_pkey port %d failed (ret = %d)\n",
2036 hca->name, port, result);
2037 goto device_init_failed;
2038 }
2039
2040 result = ipoib_set_dev_features(priv, hca);
2041 if (result)
2042 goto device_init_failed;
2043
2044 /*
2045 * Set the full membership bit, so that we join the right
2046 * broadcast group, etc.
2047 */
2048 priv->pkey |= 0x8000;
2049
2050 priv->dev->broadcast[8] = priv->pkey >> 8;
2051 priv->dev->broadcast[9] = priv->pkey & 0xff;
2052
2053 result = ib_query_gid(hca, port, 0, &priv->local_gid, NULL);
2054 if (result) {
2055 printk(KERN_WARNING "%s: ib_query_gid port %d failed (ret = %d)\n",
2056 hca->name, port, result);
2057 goto device_init_failed;
2058 } else
2059 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
2060 set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2061
2062 result = ipoib_dev_init(priv->dev, hca, port);
2063 if (result < 0) {
2064 printk(KERN_WARNING "%s: failed to initialize port %d (ret = %d)\n",
2065 hca->name, port, result);
2066 goto device_init_failed;
2067 }
2068
2069 INIT_IB_EVENT_HANDLER(&priv->event_handler,
2070 priv->ca, ipoib_event);
2071 result = ib_register_event_handler(&priv->event_handler);
2072 if (result < 0) {
2073 printk(KERN_WARNING "%s: ib_register_event_handler failed for "
2074 "port %d (ret = %d)\n",
2075 hca->name, port, result);
2076 goto event_failed;
2077 }
2078
2079 result = register_netdev(priv->dev);
2080 if (result) {
2081 printk(KERN_WARNING "%s: couldn't register ipoib port %d; error %d\n",
2082 hca->name, port, result);
2083 goto register_failed;
2084 }
2085
2086 ipoib_create_debug_files(priv->dev);
2087
2088 if (ipoib_cm_add_mode_attr(priv->dev))
2089 goto sysfs_failed;
2090 if (ipoib_add_pkey_attr(priv->dev))
2091 goto sysfs_failed;
2092 if (ipoib_add_umcast_attr(priv->dev))
2093 goto sysfs_failed;
2094 if (device_create_file(&priv->dev->dev, &dev_attr_create_child))
2095 goto sysfs_failed;
2096 if (device_create_file(&priv->dev->dev, &dev_attr_delete_child))
2097 goto sysfs_failed;
2098
2099 return priv->dev;
2100
2101 sysfs_failed:
2102 ipoib_delete_debug_files(priv->dev);
2103 unregister_netdev(priv->dev);
2104
2105 register_failed:
2106 ib_unregister_event_handler(&priv->event_handler);
2107 flush_workqueue(ipoib_workqueue);
2108 /* Stop GC if started before flush */
2109 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
2110 cancel_delayed_work(&priv->neigh_reap_task);
2111 flush_workqueue(priv->wq);
2112
2113 event_failed:
2114 ipoib_dev_cleanup(priv->dev);
2115
2116 device_init_failed:
2117 free_netdev(priv->dev);
2118
2119 alloc_mem_failed:
2120 return ERR_PTR(result);
2121 }
2122
2123 static void ipoib_add_one(struct ib_device *device)
2124 {
2125 struct list_head *dev_list;
2126 struct net_device *dev;
2127 struct ipoib_dev_priv *priv;
2128 int p;
2129 int count = 0;
2130
2131 dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
2132 if (!dev_list)
2133 return;
2134
2135 INIT_LIST_HEAD(dev_list);
2136
2137 for (p = rdma_start_port(device); p <= rdma_end_port(device); ++p) {
2138 if (!rdma_protocol_ib(device, p))
2139 continue;
2140 dev = ipoib_add_port("ib%d", device, p);
2141 if (!IS_ERR(dev)) {
2142 priv = netdev_priv(dev);
2143 list_add_tail(&priv->list, dev_list);
2144 count++;
2145 }
2146 }
2147
2148 if (!count) {
2149 kfree(dev_list);
2150 return;
2151 }
2152
2153 ib_set_client_data(device, &ipoib_client, dev_list);
2154 }
2155
2156 static void ipoib_remove_one(struct ib_device *device, void *client_data)
2157 {
2158 struct ipoib_dev_priv *priv, *tmp;
2159 struct list_head *dev_list = client_data;
2160
2161 if (!dev_list)
2162 return;
2163
2164 list_for_each_entry_safe(priv, tmp, dev_list, list) {
2165 ib_unregister_event_handler(&priv->event_handler);
2166 flush_workqueue(ipoib_workqueue);
2167
2168 /* mark interface in the middle of destruction */
2169 set_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags);
2170
2171 rtnl_lock();
2172 dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
2173 rtnl_unlock();
2174
2175 /* Stop GC */
2176 set_bit(IPOIB_STOP_NEIGH_GC, &priv->flags);
2177 cancel_delayed_work(&priv->neigh_reap_task);
2178 flush_workqueue(priv->wq);
2179
2180 unregister_netdev(priv->dev);
2181 free_netdev(priv->dev);
2182 }
2183
2184 kfree(dev_list);
2185 }
2186
2187 static int __init ipoib_init_module(void)
2188 {
2189 int ret;
2190
2191 ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2192 ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2193 ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2194
2195 ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2196 ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2197 ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2198 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2199 ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2200 #endif
2201
2202 /*
2203 * When copying small received packets, we only copy from the
2204 * linear data part of the SKB, so we rely on this condition.
2205 */
2206 BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2207
2208 ret = ipoib_register_debugfs();
2209 if (ret)
2210 return ret;
2211
2212 /*
2213 * We create a global workqueue here that is used for all flush
2214 * operations. However, if you attempt to flush a workqueue
2215 * from a task on that same workqueue, it deadlocks the system.
2216 * We want to be able to flush the tasks associated with a
2217 * specific net device, so we also create a workqueue for each
2218 * netdevice. We queue up the tasks for that device only on
2219 * its private workqueue, and we only queue up flush events
2220 * on our global flush workqueue. This avoids the deadlocks.
2221 */
2222 ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush",
2223 WQ_MEM_RECLAIM);
2224 if (!ipoib_workqueue) {
2225 ret = -ENOMEM;
2226 goto err_fs;
2227 }
2228
2229 ib_sa_register_client(&ipoib_sa_client);
2230
2231 ret = ib_register_client(&ipoib_client);
2232 if (ret)
2233 goto err_sa;
2234
2235 ret = ipoib_netlink_init();
2236 if (ret)
2237 goto err_client;
2238
2239 return 0;
2240
2241 err_client:
2242 ib_unregister_client(&ipoib_client);
2243
2244 err_sa:
2245 ib_sa_unregister_client(&ipoib_sa_client);
2246 destroy_workqueue(ipoib_workqueue);
2247
2248 err_fs:
2249 ipoib_unregister_debugfs();
2250
2251 return ret;
2252 }
2253
2254 static void __exit ipoib_cleanup_module(void)
2255 {
2256 ipoib_netlink_fini();
2257 ib_unregister_client(&ipoib_client);
2258 ib_sa_unregister_client(&ipoib_sa_client);
2259 ipoib_unregister_debugfs();
2260 destroy_workqueue(ipoib_workqueue);
2261 }
2262
2263 module_init(ipoib_init_module);
2264 module_exit(ipoib_cleanup_module);
Linux with added FPC-III support