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[deliverable/linux.git] / drivers / infiniband / ulp / ipoib / ipoib_multicast.c
1 /*
2 * Copyright (c) 2004, 2005 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 * $Id: ipoib_multicast.c 1362 2004-12-18 15:56:29Z roland $
35 */
36
37 #include <linux/skbuff.h>
38 #include <linux/rtnetlink.h>
39 #include <linux/ip.h>
40 #include <linux/in.h>
41 #include <linux/igmp.h>
42 #include <linux/inetdevice.h>
43 #include <linux/delay.h>
44 #include <linux/completion.h>
45
46 #include "ipoib.h"
47
48 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
49 static int mcast_debug_level;
50
51 module_param(mcast_debug_level, int, 0644);
52 MODULE_PARM_DESC(mcast_debug_level,
53 "Enable multicast debug tracing if > 0");
54 #endif
55
56 static DECLARE_MUTEX(mcast_mutex);
57
58 /* Used for all multicast joins (broadcast, IPv4 mcast and IPv6 mcast) */
59 struct ipoib_mcast {
60 struct ib_sa_mcmember_rec mcmember;
61 struct ipoib_ah *ah;
62
63 struct rb_node rb_node;
64 struct list_head list;
65 struct completion done;
66
67 int query_id;
68 struct ib_sa_query *query;
69
70 unsigned long created;
71 unsigned long backoff;
72
73 unsigned long flags;
74 unsigned char logcount;
75
76 struct list_head neigh_list;
77
78 struct sk_buff_head pkt_queue;
79
80 struct net_device *dev;
81 };
82
83 struct ipoib_mcast_iter {
84 struct net_device *dev;
85 union ib_gid mgid;
86 unsigned long created;
87 unsigned int queuelen;
88 unsigned int complete;
89 unsigned int send_only;
90 };
91
92 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
93 {
94 struct net_device *dev = mcast->dev;
95 struct ipoib_dev_priv *priv = netdev_priv(dev);
96 struct ipoib_neigh *neigh, *tmp;
97 unsigned long flags;
98 LIST_HEAD(ah_list);
99 struct ipoib_ah *ah, *tah;
100
101 ipoib_dbg_mcast(netdev_priv(dev),
102 "deleting multicast group " IPOIB_GID_FMT "\n",
103 IPOIB_GID_ARG(mcast->mcmember.mgid));
104
105 spin_lock_irqsave(&priv->lock, flags);
106
107 list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
108 if (neigh->ah)
109 list_add_tail(&neigh->ah->list, &ah_list);
110 *to_ipoib_neigh(neigh->neighbour) = NULL;
111 neigh->neighbour->ops->destructor = NULL;
112 kfree(neigh);
113 }
114
115 spin_unlock_irqrestore(&priv->lock, flags);
116
117 list_for_each_entry_safe(ah, tah, &ah_list, list)
118 ipoib_put_ah(ah);
119
120 if (mcast->ah)
121 ipoib_put_ah(mcast->ah);
122
123 while (!skb_queue_empty(&mcast->pkt_queue)) {
124 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
125
126 skb->dev = dev;
127 dev_kfree_skb_any(skb);
128 }
129
130 kfree(mcast);
131 }
132
133 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
134 int can_sleep)
135 {
136 struct ipoib_mcast *mcast;
137
138 mcast = kmalloc(sizeof (*mcast), can_sleep ? GFP_KERNEL : GFP_ATOMIC);
139 if (!mcast)
140 return NULL;
141
142 memset(mcast, 0, sizeof (*mcast));
143
144 init_completion(&mcast->done);
145
146 mcast->dev = dev;
147 mcast->created = jiffies;
148 mcast->backoff = 1;
149 mcast->logcount = 0;
150
151 INIT_LIST_HEAD(&mcast->list);
152 INIT_LIST_HEAD(&mcast->neigh_list);
153 skb_queue_head_init(&mcast->pkt_queue);
154
155 mcast->ah = NULL;
156 mcast->query = NULL;
157
158 return mcast;
159 }
160
161 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, union ib_gid *mgid)
162 {
163 struct ipoib_dev_priv *priv = netdev_priv(dev);
164 struct rb_node *n = priv->multicast_tree.rb_node;
165
166 while (n) {
167 struct ipoib_mcast *mcast;
168 int ret;
169
170 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
171
172 ret = memcmp(mgid->raw, mcast->mcmember.mgid.raw,
173 sizeof (union ib_gid));
174 if (ret < 0)
175 n = n->rb_left;
176 else if (ret > 0)
177 n = n->rb_right;
178 else
179 return mcast;
180 }
181
182 return NULL;
183 }
184
185 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
186 {
187 struct ipoib_dev_priv *priv = netdev_priv(dev);
188 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
189
190 while (*n) {
191 struct ipoib_mcast *tmcast;
192 int ret;
193
194 pn = *n;
195 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
196
197 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
198 sizeof (union ib_gid));
199 if (ret < 0)
200 n = &pn->rb_left;
201 else if (ret > 0)
202 n = &pn->rb_right;
203 else
204 return -EEXIST;
205 }
206
207 rb_link_node(&mcast->rb_node, pn, n);
208 rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
209
210 return 0;
211 }
212
213 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
214 struct ib_sa_mcmember_rec *mcmember)
215 {
216 struct net_device *dev = mcast->dev;
217 struct ipoib_dev_priv *priv = netdev_priv(dev);
218 int ret;
219
220 mcast->mcmember = *mcmember;
221
222 /* Set the cached Q_Key before we attach if it's the broadcast group */
223 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
224 sizeof (union ib_gid))) {
225 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
226 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
227 }
228
229 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
230 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
231 ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
232 " already attached\n",
233 IPOIB_GID_ARG(mcast->mcmember.mgid));
234
235 return 0;
236 }
237
238 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
239 &mcast->mcmember.mgid);
240 if (ret < 0) {
241 ipoib_warn(priv, "couldn't attach QP to multicast group "
242 IPOIB_GID_FMT "\n",
243 IPOIB_GID_ARG(mcast->mcmember.mgid));
244
245 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
246 return ret;
247 }
248 }
249
250 {
251 struct ib_ah_attr av = {
252 .dlid = be16_to_cpu(mcast->mcmember.mlid),
253 .port_num = priv->port,
254 .sl = mcast->mcmember.sl,
255 .ah_flags = IB_AH_GRH,
256 .grh = {
257 .flow_label = be32_to_cpu(mcast->mcmember.flow_label),
258 .hop_limit = mcast->mcmember.hop_limit,
259 .sgid_index = 0,
260 .traffic_class = mcast->mcmember.traffic_class
261 }
262 };
263 int path_rate = ib_sa_rate_enum_to_int(mcast->mcmember.rate);
264
265 av.grh.dgid = mcast->mcmember.mgid;
266
267 if (path_rate > 0 && priv->local_rate > path_rate)
268 av.static_rate = (priv->local_rate - 1) / path_rate;
269
270 ipoib_dbg_mcast(priv, "static_rate %d for local port %dX, mcmember %dX\n",
271 av.static_rate, priv->local_rate,
272 ib_sa_rate_enum_to_int(mcast->mcmember.rate));
273
274 mcast->ah = ipoib_create_ah(dev, priv->pd, &av);
275 if (!mcast->ah) {
276 ipoib_warn(priv, "ib_address_create failed\n");
277 } else {
278 ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
279 " AV %p, LID 0x%04x, SL %d\n",
280 IPOIB_GID_ARG(mcast->mcmember.mgid),
281 mcast->ah->ah,
282 be16_to_cpu(mcast->mcmember.mlid),
283 mcast->mcmember.sl);
284 }
285 }
286
287 /* actually send any queued packets */
288 while (!skb_queue_empty(&mcast->pkt_queue)) {
289 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
290
291 skb->dev = dev;
292
293 if (!skb->dst || !skb->dst->neighbour) {
294 /* put pseudoheader back on for next time */
295 skb_push(skb, sizeof (struct ipoib_pseudoheader));
296 }
297
298 if (dev_queue_xmit(skb))
299 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
300 }
301
302 return 0;
303 }
304
305 static void
306 ipoib_mcast_sendonly_join_complete(int status,
307 struct ib_sa_mcmember_rec *mcmember,
308 void *mcast_ptr)
309 {
310 struct ipoib_mcast *mcast = mcast_ptr;
311 struct net_device *dev = mcast->dev;
312
313 if (!status)
314 ipoib_mcast_join_finish(mcast, mcmember);
315 else {
316 if (mcast->logcount++ < 20)
317 ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
318 IPOIB_GID_FMT ", status %d\n",
319 IPOIB_GID_ARG(mcast->mcmember.mgid), status);
320
321 /* Flush out any queued packets */
322 while (!skb_queue_empty(&mcast->pkt_queue)) {
323 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
324
325 skb->dev = dev;
326
327 dev_kfree_skb_any(skb);
328 }
329
330 /* Clear the busy flag so we try again */
331 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
332 }
333
334 complete(&mcast->done);
335 }
336
337 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
338 {
339 struct net_device *dev = mcast->dev;
340 struct ipoib_dev_priv *priv = netdev_priv(dev);
341 struct ib_sa_mcmember_rec rec = {
342 #if 0 /* Some SMs don't support send-only yet */
343 .join_state = 4
344 #else
345 .join_state = 1
346 #endif
347 };
348 int ret = 0;
349
350 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
351 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
352 return -ENODEV;
353 }
354
355 if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
356 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
357 return -EBUSY;
358 }
359
360 rec.mgid = mcast->mcmember.mgid;
361 rec.port_gid = priv->local_gid;
362 rec.pkey = cpu_to_be16(priv->pkey);
363
364 ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec,
365 IB_SA_MCMEMBER_REC_MGID |
366 IB_SA_MCMEMBER_REC_PORT_GID |
367 IB_SA_MCMEMBER_REC_PKEY |
368 IB_SA_MCMEMBER_REC_JOIN_STATE,
369 1000, GFP_ATOMIC,
370 ipoib_mcast_sendonly_join_complete,
371 mcast, &mcast->query);
372 if (ret < 0) {
373 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed (ret = %d)\n",
374 ret);
375 } else {
376 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
377 ", starting join\n",
378 IPOIB_GID_ARG(mcast->mcmember.mgid));
379
380 mcast->query_id = ret;
381 }
382
383 return ret;
384 }
385
386 static void ipoib_mcast_join_complete(int status,
387 struct ib_sa_mcmember_rec *mcmember,
388 void *mcast_ptr)
389 {
390 struct ipoib_mcast *mcast = mcast_ptr;
391 struct net_device *dev = mcast->dev;
392 struct ipoib_dev_priv *priv = netdev_priv(dev);
393
394 ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
395 " (status %d)\n",
396 IPOIB_GID_ARG(mcast->mcmember.mgid), status);
397
398 if (!status && !ipoib_mcast_join_finish(mcast, mcmember)) {
399 mcast->backoff = 1;
400 down(&mcast_mutex);
401 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
402 queue_work(ipoib_workqueue, &priv->mcast_task);
403 up(&mcast_mutex);
404 complete(&mcast->done);
405 return;
406 }
407
408 if (status == -EINTR) {
409 complete(&mcast->done);
410 return;
411 }
412
413 if (status && mcast->logcount++ < 20) {
414 if (status == -ETIMEDOUT || status == -EINTR) {
415 ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
416 ", status %d\n",
417 IPOIB_GID_ARG(mcast->mcmember.mgid),
418 status);
419 } else {
420 ipoib_warn(priv, "multicast join failed for "
421 IPOIB_GID_FMT ", status %d\n",
422 IPOIB_GID_ARG(mcast->mcmember.mgid),
423 status);
424 }
425 }
426
427 mcast->backoff *= 2;
428 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
429 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
430
431 mcast->query = NULL;
432
433 down(&mcast_mutex);
434 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) {
435 if (status == -ETIMEDOUT)
436 queue_work(ipoib_workqueue, &priv->mcast_task);
437 else
438 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
439 mcast->backoff * HZ);
440 } else
441 complete(&mcast->done);
442 up(&mcast_mutex);
443
444 return;
445 }
446
447 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
448 int create)
449 {
450 struct ipoib_dev_priv *priv = netdev_priv(dev);
451 struct ib_sa_mcmember_rec rec = {
452 .join_state = 1
453 };
454 ib_sa_comp_mask comp_mask;
455 int ret = 0;
456
457 ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
458 IPOIB_GID_ARG(mcast->mcmember.mgid));
459
460 rec.mgid = mcast->mcmember.mgid;
461 rec.port_gid = priv->local_gid;
462 rec.pkey = cpu_to_be16(priv->pkey);
463
464 comp_mask =
465 IB_SA_MCMEMBER_REC_MGID |
466 IB_SA_MCMEMBER_REC_PORT_GID |
467 IB_SA_MCMEMBER_REC_PKEY |
468 IB_SA_MCMEMBER_REC_JOIN_STATE;
469
470 if (create) {
471 comp_mask |=
472 IB_SA_MCMEMBER_REC_QKEY |
473 IB_SA_MCMEMBER_REC_SL |
474 IB_SA_MCMEMBER_REC_FLOW_LABEL |
475 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
476
477 rec.qkey = priv->broadcast->mcmember.qkey;
478 rec.sl = priv->broadcast->mcmember.sl;
479 rec.flow_label = priv->broadcast->mcmember.flow_label;
480 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
481 }
482
483 ret = ib_sa_mcmember_rec_set(priv->ca, priv->port, &rec, comp_mask,
484 mcast->backoff * 1000, GFP_ATOMIC,
485 ipoib_mcast_join_complete,
486 mcast, &mcast->query);
487
488 if (ret < 0) {
489 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed, status %d\n", ret);
490
491 mcast->backoff *= 2;
492 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
493 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
494
495 down(&mcast_mutex);
496 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
497 queue_delayed_work(ipoib_workqueue,
498 &priv->mcast_task,
499 mcast->backoff * HZ);
500 up(&mcast_mutex);
501 } else
502 mcast->query_id = ret;
503 }
504
505 void ipoib_mcast_join_task(void *dev_ptr)
506 {
507 struct net_device *dev = dev_ptr;
508 struct ipoib_dev_priv *priv = netdev_priv(dev);
509
510 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
511 return;
512
513 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
514 ipoib_warn(priv, "ib_gid_entry_get() failed\n");
515 else
516 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
517
518 {
519 struct ib_port_attr attr;
520
521 if (!ib_query_port(priv->ca, priv->port, &attr)) {
522 priv->local_lid = attr.lid;
523 priv->local_rate = attr.active_speed *
524 ib_width_enum_to_int(attr.active_width);
525 } else
526 ipoib_warn(priv, "ib_query_port failed\n");
527 }
528
529 if (!priv->broadcast) {
530 priv->broadcast = ipoib_mcast_alloc(dev, 1);
531 if (!priv->broadcast) {
532 ipoib_warn(priv, "failed to allocate broadcast group\n");
533 down(&mcast_mutex);
534 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
535 queue_delayed_work(ipoib_workqueue,
536 &priv->mcast_task, HZ);
537 up(&mcast_mutex);
538 return;
539 }
540
541 memcpy(priv->broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
542 sizeof (union ib_gid));
543
544 spin_lock_irq(&priv->lock);
545 __ipoib_mcast_add(dev, priv->broadcast);
546 spin_unlock_irq(&priv->lock);
547 }
548
549 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
550 ipoib_mcast_join(dev, priv->broadcast, 0);
551 return;
552 }
553
554 while (1) {
555 struct ipoib_mcast *mcast = NULL;
556
557 spin_lock_irq(&priv->lock);
558 list_for_each_entry(mcast, &priv->multicast_list, list) {
559 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
560 && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
561 && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
562 /* Found the next unjoined group */
563 break;
564 }
565 }
566 spin_unlock_irq(&priv->lock);
567
568 if (&mcast->list == &priv->multicast_list) {
569 /* All done */
570 break;
571 }
572
573 ipoib_mcast_join(dev, mcast, 1);
574 return;
575 }
576
577 priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
578 IPOIB_ENCAP_LEN;
579 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
580
581 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
582
583 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
584 netif_carrier_on(dev);
585 }
586
587 int ipoib_mcast_start_thread(struct net_device *dev)
588 {
589 struct ipoib_dev_priv *priv = netdev_priv(dev);
590
591 ipoib_dbg_mcast(priv, "starting multicast thread\n");
592
593 down(&mcast_mutex);
594 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
595 queue_work(ipoib_workqueue, &priv->mcast_task);
596 up(&mcast_mutex);
597
598 return 0;
599 }
600
601 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
602 {
603 struct ipoib_dev_priv *priv = netdev_priv(dev);
604 struct ipoib_mcast *mcast;
605
606 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
607
608 down(&mcast_mutex);
609 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
610 cancel_delayed_work(&priv->mcast_task);
611 up(&mcast_mutex);
612
613 if (flush)
614 flush_workqueue(ipoib_workqueue);
615
616 if (priv->broadcast && priv->broadcast->query) {
617 ib_sa_cancel_query(priv->broadcast->query_id, priv->broadcast->query);
618 priv->broadcast->query = NULL;
619 ipoib_dbg_mcast(priv, "waiting for bcast\n");
620 wait_for_completion(&priv->broadcast->done);
621 }
622
623 list_for_each_entry(mcast, &priv->multicast_list, list) {
624 if (mcast->query) {
625 ib_sa_cancel_query(mcast->query_id, mcast->query);
626 mcast->query = NULL;
627 ipoib_dbg_mcast(priv, "waiting for MGID " IPOIB_GID_FMT "\n",
628 IPOIB_GID_ARG(mcast->mcmember.mgid));
629 wait_for_completion(&mcast->done);
630 }
631 }
632
633 return 0;
634 }
635
636 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
637 {
638 struct ipoib_dev_priv *priv = netdev_priv(dev);
639 struct ib_sa_mcmember_rec rec = {
640 .join_state = 1
641 };
642 int ret = 0;
643
644 if (!test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags))
645 return 0;
646
647 ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
648 IPOIB_GID_ARG(mcast->mcmember.mgid));
649
650 rec.mgid = mcast->mcmember.mgid;
651 rec.port_gid = priv->local_gid;
652 rec.pkey = cpu_to_be16(priv->pkey);
653
654 /* Remove ourselves from the multicast group */
655 ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
656 &mcast->mcmember.mgid);
657 if (ret)
658 ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
659
660 /*
661 * Just make one shot at leaving and don't wait for a reply;
662 * if we fail, too bad.
663 */
664 ret = ib_sa_mcmember_rec_delete(priv->ca, priv->port, &rec,
665 IB_SA_MCMEMBER_REC_MGID |
666 IB_SA_MCMEMBER_REC_PORT_GID |
667 IB_SA_MCMEMBER_REC_PKEY |
668 IB_SA_MCMEMBER_REC_JOIN_STATE,
669 0, GFP_ATOMIC, NULL,
670 mcast, &mcast->query);
671 if (ret < 0)
672 ipoib_warn(priv, "ib_sa_mcmember_rec_delete failed "
673 "for leave (result = %d)\n", ret);
674
675 return 0;
676 }
677
678 void ipoib_mcast_send(struct net_device *dev, union ib_gid *mgid,
679 struct sk_buff *skb)
680 {
681 struct ipoib_dev_priv *priv = netdev_priv(dev);
682 struct ipoib_mcast *mcast;
683
684 /*
685 * We can only be called from ipoib_start_xmit, so we're
686 * inside tx_lock -- no need to save/restore flags.
687 */
688 spin_lock(&priv->lock);
689
690 mcast = __ipoib_mcast_find(dev, mgid);
691 if (!mcast) {
692 /* Let's create a new send only group now */
693 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
694 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(*mgid));
695
696 mcast = ipoib_mcast_alloc(dev, 0);
697 if (!mcast) {
698 ipoib_warn(priv, "unable to allocate memory for "
699 "multicast structure\n");
700 dev_kfree_skb_any(skb);
701 goto out;
702 }
703
704 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
705 mcast->mcmember.mgid = *mgid;
706 __ipoib_mcast_add(dev, mcast);
707 list_add_tail(&mcast->list, &priv->multicast_list);
708 }
709
710 if (!mcast->ah) {
711 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
712 skb_queue_tail(&mcast->pkt_queue, skb);
713 else
714 dev_kfree_skb_any(skb);
715
716 if (mcast->query)
717 ipoib_dbg_mcast(priv, "no address vector, "
718 "but multicast join already started\n");
719 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
720 ipoib_mcast_sendonly_join(mcast);
721
722 /*
723 * If lookup completes between here and out:, don't
724 * want to send packet twice.
725 */
726 mcast = NULL;
727 }
728
729 out:
730 if (mcast && mcast->ah) {
731 if (skb->dst &&
732 skb->dst->neighbour &&
733 !*to_ipoib_neigh(skb->dst->neighbour)) {
734 struct ipoib_neigh *neigh = kmalloc(sizeof *neigh, GFP_ATOMIC);
735
736 if (neigh) {
737 kref_get(&mcast->ah->ref);
738 neigh->ah = mcast->ah;
739 neigh->neighbour = skb->dst->neighbour;
740 *to_ipoib_neigh(skb->dst->neighbour) = neigh;
741 list_add_tail(&neigh->list, &mcast->neigh_list);
742 }
743 }
744
745 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
746 }
747
748 spin_unlock(&priv->lock);
749 }
750
751 void ipoib_mcast_dev_flush(struct net_device *dev)
752 {
753 struct ipoib_dev_priv *priv = netdev_priv(dev);
754 LIST_HEAD(remove_list);
755 struct ipoib_mcast *mcast, *tmcast, *nmcast;
756 unsigned long flags;
757
758 ipoib_dbg_mcast(priv, "flushing multicast list\n");
759
760 spin_lock_irqsave(&priv->lock, flags);
761 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
762 nmcast = ipoib_mcast_alloc(dev, 0);
763 if (nmcast) {
764 nmcast->flags =
765 mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY);
766
767 nmcast->mcmember.mgid = mcast->mcmember.mgid;
768
769 /* Add the new group in before the to-be-destroyed group */
770 list_add_tail(&nmcast->list, &mcast->list);
771 list_del_init(&mcast->list);
772
773 rb_replace_node(&mcast->rb_node, &nmcast->rb_node,
774 &priv->multicast_tree);
775
776 list_add_tail(&mcast->list, &remove_list);
777 } else {
778 ipoib_warn(priv, "could not reallocate multicast group "
779 IPOIB_GID_FMT "\n",
780 IPOIB_GID_ARG(mcast->mcmember.mgid));
781 }
782 }
783
784 if (priv->broadcast) {
785 nmcast = ipoib_mcast_alloc(dev, 0);
786 if (nmcast) {
787 nmcast->mcmember.mgid = priv->broadcast->mcmember.mgid;
788
789 rb_replace_node(&priv->broadcast->rb_node,
790 &nmcast->rb_node,
791 &priv->multicast_tree);
792
793 list_add_tail(&priv->broadcast->list, &remove_list);
794 }
795
796 priv->broadcast = nmcast;
797 }
798
799 spin_unlock_irqrestore(&priv->lock, flags);
800
801 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
802 ipoib_mcast_leave(dev, mcast);
803 ipoib_mcast_free(mcast);
804 }
805 }
806
807 void ipoib_mcast_dev_down(struct net_device *dev)
808 {
809 struct ipoib_dev_priv *priv = netdev_priv(dev);
810 unsigned long flags;
811
812 /* Delete broadcast since it will be recreated */
813 if (priv->broadcast) {
814 ipoib_dbg_mcast(priv, "deleting broadcast group\n");
815
816 spin_lock_irqsave(&priv->lock, flags);
817 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
818 spin_unlock_irqrestore(&priv->lock, flags);
819 ipoib_mcast_leave(dev, priv->broadcast);
820 ipoib_mcast_free(priv->broadcast);
821 priv->broadcast = NULL;
822 }
823 }
824
825 void ipoib_mcast_restart_task(void *dev_ptr)
826 {
827 struct net_device *dev = dev_ptr;
828 struct ipoib_dev_priv *priv = netdev_priv(dev);
829 struct dev_mc_list *mclist;
830 struct ipoib_mcast *mcast, *tmcast;
831 LIST_HEAD(remove_list);
832 unsigned long flags;
833
834 ipoib_dbg_mcast(priv, "restarting multicast task\n");
835
836 ipoib_mcast_stop_thread(dev, 0);
837
838 spin_lock_irqsave(&priv->lock, flags);
839
840 /*
841 * Unfortunately, the networking core only gives us a list of all of
842 * the multicast hardware addresses. We need to figure out which ones
843 * are new and which ones have been removed
844 */
845
846 /* Clear out the found flag */
847 list_for_each_entry(mcast, &priv->multicast_list, list)
848 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
849
850 /* Mark all of the entries that are found or don't exist */
851 for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
852 union ib_gid mgid;
853
854 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
855
856 /* Add in the P_Key */
857 mgid.raw[4] = (priv->pkey >> 8) & 0xff;
858 mgid.raw[5] = priv->pkey & 0xff;
859
860 mcast = __ipoib_mcast_find(dev, &mgid);
861 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
862 struct ipoib_mcast *nmcast;
863
864 /* Not found or send-only group, let's add a new entry */
865 ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
866 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
867
868 nmcast = ipoib_mcast_alloc(dev, 0);
869 if (!nmcast) {
870 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
871 continue;
872 }
873
874 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
875
876 nmcast->mcmember.mgid = mgid;
877
878 if (mcast) {
879 /* Destroy the send only entry */
880 list_del(&mcast->list);
881 list_add_tail(&mcast->list, &remove_list);
882
883 rb_replace_node(&mcast->rb_node,
884 &nmcast->rb_node,
885 &priv->multicast_tree);
886 } else
887 __ipoib_mcast_add(dev, nmcast);
888
889 list_add_tail(&nmcast->list, &priv->multicast_list);
890 }
891
892 if (mcast)
893 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
894 }
895
896 /* Remove all of the entries don't exist anymore */
897 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
898 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
899 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
900 ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
901 IPOIB_GID_ARG(mcast->mcmember.mgid));
902
903 rb_erase(&mcast->rb_node, &priv->multicast_tree);
904
905 /* Move to the remove list */
906 list_del(&mcast->list);
907 list_add_tail(&mcast->list, &remove_list);
908 }
909 }
910 spin_unlock_irqrestore(&priv->lock, flags);
911
912 /* We have to cancel outside of the spinlock */
913 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
914 ipoib_mcast_leave(mcast->dev, mcast);
915 ipoib_mcast_free(mcast);
916 }
917
918 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
919 ipoib_mcast_start_thread(dev);
920 }
921
922 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
923 {
924 struct ipoib_mcast_iter *iter;
925
926 iter = kmalloc(sizeof *iter, GFP_KERNEL);
927 if (!iter)
928 return NULL;
929
930 iter->dev = dev;
931 memset(iter->mgid.raw, 0, sizeof iter->mgid);
932
933 if (ipoib_mcast_iter_next(iter)) {
934 ipoib_mcast_iter_free(iter);
935 return NULL;
936 }
937
938 return iter;
939 }
940
941 void ipoib_mcast_iter_free(struct ipoib_mcast_iter *iter)
942 {
943 kfree(iter);
944 }
945
946 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
947 {
948 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
949 struct rb_node *n;
950 struct ipoib_mcast *mcast;
951 int ret = 1;
952
953 spin_lock_irq(&priv->lock);
954
955 n = rb_first(&priv->multicast_tree);
956
957 while (n) {
958 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
959
960 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
961 sizeof (union ib_gid)) < 0) {
962 iter->mgid = mcast->mcmember.mgid;
963 iter->created = mcast->created;
964 iter->queuelen = skb_queue_len(&mcast->pkt_queue);
965 iter->complete = !!mcast->ah;
966 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
967
968 ret = 0;
969
970 break;
971 }
972
973 n = rb_next(n);
974 }
975
976 spin_unlock_irq(&priv->lock);
977
978 return ret;
979 }
980
981 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
982 union ib_gid *mgid,
983 unsigned long *created,
984 unsigned int *queuelen,
985 unsigned int *complete,
986 unsigned int *send_only)
987 {
988 *mgid = iter->mgid;
989 *created = iter->created;
990 *queuelen = iter->queuelen;
991 *complete = iter->complete;
992 *send_only = iter->send_only;
993 }
Linux kernel - Deliverables
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