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b04b72ca32eda5816e79780ed5553f51d4e53d1e
[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 <net/dst.h>
47
48 #include "ipoib.h"
49
50 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
51 static int mcast_debug_level;
52
53 module_param(mcast_debug_level, int, 0644);
54 MODULE_PARM_DESC(mcast_debug_level,
55 "Enable multicast debug tracing if > 0");
56 #endif
57
58 static DEFINE_MUTEX(mcast_mutex);
59
60 /* Used for all multicast joins (broadcast, IPv4 mcast and IPv6 mcast) */
61 struct ipoib_mcast {
62 struct ib_sa_mcmember_rec mcmember;
63 struct ipoib_ah *ah;
64
65 struct rb_node rb_node;
66 struct list_head list;
67 struct completion done;
68
69 int query_id;
70 struct ib_sa_query *query;
71
72 unsigned long created;
73 unsigned long backoff;
74
75 unsigned long flags;
76 unsigned char logcount;
77
78 struct list_head neigh_list;
79
80 struct sk_buff_head pkt_queue;
81
82 struct net_device *dev;
83 };
84
85 struct ipoib_mcast_iter {
86 struct net_device *dev;
87 union ib_gid mgid;
88 unsigned long created;
89 unsigned int queuelen;
90 unsigned int complete;
91 unsigned int send_only;
92 };
93
94 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
95 {
96 struct net_device *dev = mcast->dev;
97 struct ipoib_dev_priv *priv = netdev_priv(dev);
98 struct ipoib_neigh *neigh, *tmp;
99 unsigned long flags;
100 int tx_dropped = 0;
101
102 ipoib_dbg_mcast(netdev_priv(dev),
103 "deleting multicast group " IPOIB_GID_FMT "\n",
104 IPOIB_GID_ARG(mcast->mcmember.mgid));
105
106 spin_lock_irqsave(&priv->lock, flags);
107
108 list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
109 /*
110 * It's safe to call ipoib_put_ah() inside priv->lock
111 * here, because we know that mcast->ah will always
112 * hold one more reference, so ipoib_put_ah() will
113 * never do more than decrement the ref count.
114 */
115 if (neigh->ah)
116 ipoib_put_ah(neigh->ah);
117 ipoib_neigh_free(dev, neigh);
118 }
119
120 spin_unlock_irqrestore(&priv->lock, flags);
121
122 if (mcast->ah)
123 ipoib_put_ah(mcast->ah);
124
125 while (!skb_queue_empty(&mcast->pkt_queue)) {
126 ++tx_dropped;
127 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
128 }
129
130 spin_lock_irqsave(&priv->tx_lock, flags);
131 priv->stats.tx_dropped += tx_dropped;
132 spin_unlock_irqrestore(&priv->tx_lock, flags);
133
134 kfree(mcast);
135 }
136
137 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
138 int can_sleep)
139 {
140 struct ipoib_mcast *mcast;
141
142 mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
143 if (!mcast)
144 return NULL;
145
146 mcast->dev = dev;
147 mcast->created = jiffies;
148 mcast->backoff = 1;
149
150 INIT_LIST_HEAD(&mcast->list);
151 INIT_LIST_HEAD(&mcast->neigh_list);
152 skb_queue_head_init(&mcast->pkt_queue);
153
154 return mcast;
155 }
156
157 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
158 {
159 struct ipoib_dev_priv *priv = netdev_priv(dev);
160 struct rb_node *n = priv->multicast_tree.rb_node;
161
162 while (n) {
163 struct ipoib_mcast *mcast;
164 int ret;
165
166 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
167
168 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
169 sizeof (union ib_gid));
170 if (ret < 0)
171 n = n->rb_left;
172 else if (ret > 0)
173 n = n->rb_right;
174 else
175 return mcast;
176 }
177
178 return NULL;
179 }
180
181 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
182 {
183 struct ipoib_dev_priv *priv = netdev_priv(dev);
184 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
185
186 while (*n) {
187 struct ipoib_mcast *tmcast;
188 int ret;
189
190 pn = *n;
191 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
192
193 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
194 sizeof (union ib_gid));
195 if (ret < 0)
196 n = &pn->rb_left;
197 else if (ret > 0)
198 n = &pn->rb_right;
199 else
200 return -EEXIST;
201 }
202
203 rb_link_node(&mcast->rb_node, pn, n);
204 rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
205
206 return 0;
207 }
208
209 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
210 struct ib_sa_mcmember_rec *mcmember)
211 {
212 struct net_device *dev = mcast->dev;
213 struct ipoib_dev_priv *priv = netdev_priv(dev);
214 struct ipoib_ah *ah;
215 int ret;
216
217 mcast->mcmember = *mcmember;
218
219 /* Set the cached Q_Key before we attach if it's the broadcast group */
220 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
221 sizeof (union ib_gid))) {
222 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
223 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
224 }
225
226 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
227 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
228 ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
229 " already attached\n",
230 IPOIB_GID_ARG(mcast->mcmember.mgid));
231
232 return 0;
233 }
234
235 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
236 &mcast->mcmember.mgid);
237 if (ret < 0) {
238 ipoib_warn(priv, "couldn't attach QP to multicast group "
239 IPOIB_GID_FMT "\n",
240 IPOIB_GID_ARG(mcast->mcmember.mgid));
241
242 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
243 return ret;
244 }
245 }
246
247 {
248 struct ib_ah_attr av = {
249 .dlid = be16_to_cpu(mcast->mcmember.mlid),
250 .port_num = priv->port,
251 .sl = mcast->mcmember.sl,
252 .ah_flags = IB_AH_GRH,
253 .static_rate = mcast->mcmember.rate,
254 .grh = {
255 .flow_label = be32_to_cpu(mcast->mcmember.flow_label),
256 .hop_limit = mcast->mcmember.hop_limit,
257 .sgid_index = 0,
258 .traffic_class = mcast->mcmember.traffic_class
259 }
260 };
261 av.grh.dgid = mcast->mcmember.mgid;
262
263 ah = ipoib_create_ah(dev, priv->pd, &av);
264 if (!ah) {
265 ipoib_warn(priv, "ib_address_create failed\n");
266 } else {
267 spin_lock_irq(&priv->lock);
268 mcast->ah = ah;
269 spin_unlock_irq(&priv->lock);
270
271 ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
272 " AV %p, LID 0x%04x, SL %d\n",
273 IPOIB_GID_ARG(mcast->mcmember.mgid),
274 mcast->ah->ah,
275 be16_to_cpu(mcast->mcmember.mlid),
276 mcast->mcmember.sl);
277 }
278 }
279
280 /* actually send any queued packets */
281 spin_lock_irq(&priv->tx_lock);
282 while (!skb_queue_empty(&mcast->pkt_queue)) {
283 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
284 spin_unlock_irq(&priv->tx_lock);
285
286 skb->dev = dev;
287
288 if (!skb->dst || !skb->dst->neighbour) {
289 /* put pseudoheader back on for next time */
290 skb_push(skb, sizeof (struct ipoib_pseudoheader));
291 }
292
293 if (dev_queue_xmit(skb))
294 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
295 spin_lock_irq(&priv->tx_lock);
296 }
297 spin_unlock_irq(&priv->tx_lock);
298
299 return 0;
300 }
301
302 static void
303 ipoib_mcast_sendonly_join_complete(int status,
304 struct ib_sa_mcmember_rec *mcmember,
305 void *mcast_ptr)
306 {
307 struct ipoib_mcast *mcast = mcast_ptr;
308 struct net_device *dev = mcast->dev;
309 struct ipoib_dev_priv *priv = netdev_priv(dev);
310
311 if (!status)
312 ipoib_mcast_join_finish(mcast, mcmember);
313 else {
314 if (mcast->logcount++ < 20)
315 ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
316 IPOIB_GID_FMT ", status %d\n",
317 IPOIB_GID_ARG(mcast->mcmember.mgid), status);
318
319 /* Flush out any queued packets */
320 spin_lock_irq(&priv->tx_lock);
321 while (!skb_queue_empty(&mcast->pkt_queue)) {
322 ++priv->stats.tx_dropped;
323 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
324 }
325 spin_unlock_irq(&priv->tx_lock);
326
327 /* Clear the busy flag so we try again */
328 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
329 mcast->query = NULL;
330 }
331
332 complete(&mcast->done);
333 }
334
335 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
336 {
337 struct net_device *dev = mcast->dev;
338 struct ipoib_dev_priv *priv = netdev_priv(dev);
339 struct ib_sa_mcmember_rec rec = {
340 #if 0 /* Some SMs don't support send-only yet */
341 .join_state = 4
342 #else
343 .join_state = 1
344 #endif
345 };
346 int ret = 0;
347
348 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
349 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
350 return -ENODEV;
351 }
352
353 if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
354 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
355 return -EBUSY;
356 }
357
358 rec.mgid = mcast->mcmember.mgid;
359 rec.port_gid = priv->local_gid;
360 rec.pkey = cpu_to_be16(priv->pkey);
361
362 init_completion(&mcast->done);
363
364 ret = ib_sa_mcmember_rec_set(&ipoib_sa_client, 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 mutex_lock(&mcast_mutex);
401 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
402 queue_delayed_work(ipoib_workqueue,
403 &priv->mcast_task, 0);
404 mutex_unlock(&mcast_mutex);
405 complete(&mcast->done);
406 return;
407 }
408
409 if (status == -EINTR) {
410 complete(&mcast->done);
411 return;
412 }
413
414 if (status && mcast->logcount++ < 20) {
415 if (status == -ETIMEDOUT || status == -EINTR) {
416 ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
417 ", status %d\n",
418 IPOIB_GID_ARG(mcast->mcmember.mgid),
419 status);
420 } else {
421 ipoib_warn(priv, "multicast join failed for "
422 IPOIB_GID_FMT ", status %d\n",
423 IPOIB_GID_ARG(mcast->mcmember.mgid),
424 status);
425 }
426 }
427
428 mcast->backoff *= 2;
429 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
430 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
431
432 mutex_lock(&mcast_mutex);
433
434 spin_lock_irq(&priv->lock);
435 mcast->query = NULL;
436
437 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) {
438 if (status == -ETIMEDOUT)
439 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
440 0);
441 else
442 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
443 mcast->backoff * HZ);
444 } else
445 complete(&mcast->done);
446 spin_unlock_irq(&priv->lock);
447 mutex_unlock(&mcast_mutex);
448
449 return;
450 }
451
452 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
453 int create)
454 {
455 struct ipoib_dev_priv *priv = netdev_priv(dev);
456 struct ib_sa_mcmember_rec rec = {
457 .join_state = 1
458 };
459 ib_sa_comp_mask comp_mask;
460 int ret = 0;
461
462 ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
463 IPOIB_GID_ARG(mcast->mcmember.mgid));
464
465 rec.mgid = mcast->mcmember.mgid;
466 rec.port_gid = priv->local_gid;
467 rec.pkey = cpu_to_be16(priv->pkey);
468
469 comp_mask =
470 IB_SA_MCMEMBER_REC_MGID |
471 IB_SA_MCMEMBER_REC_PORT_GID |
472 IB_SA_MCMEMBER_REC_PKEY |
473 IB_SA_MCMEMBER_REC_JOIN_STATE;
474
475 if (create) {
476 comp_mask |=
477 IB_SA_MCMEMBER_REC_QKEY |
478 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
479 IB_SA_MCMEMBER_REC_MTU |
480 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |
481 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
482 IB_SA_MCMEMBER_REC_RATE |
483 IB_SA_MCMEMBER_REC_SL |
484 IB_SA_MCMEMBER_REC_FLOW_LABEL |
485 IB_SA_MCMEMBER_REC_HOP_LIMIT;
486
487 rec.qkey = priv->broadcast->mcmember.qkey;
488 rec.mtu_selector = IB_SA_EQ;
489 rec.mtu = priv->broadcast->mcmember.mtu;
490 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
491 rec.rate_selector = IB_SA_EQ;
492 rec.rate = priv->broadcast->mcmember.rate;
493 rec.sl = priv->broadcast->mcmember.sl;
494 rec.flow_label = priv->broadcast->mcmember.flow_label;
495 rec.hop_limit = priv->broadcast->mcmember.hop_limit;
496 }
497
498 init_completion(&mcast->done);
499
500 ret = ib_sa_mcmember_rec_set(&ipoib_sa_client, priv->ca, priv->port,
501 &rec, comp_mask, mcast->backoff * 1000,
502 GFP_ATOMIC, ipoib_mcast_join_complete,
503 mcast, &mcast->query);
504
505 if (ret < 0) {
506 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed, status %d\n", ret);
507
508 mcast->backoff *= 2;
509 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
510 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
511
512 mutex_lock(&mcast_mutex);
513 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
514 queue_delayed_work(ipoib_workqueue,
515 &priv->mcast_task,
516 mcast->backoff * HZ);
517 mutex_unlock(&mcast_mutex);
518 } else
519 mcast->query_id = ret;
520 }
521
522 void ipoib_mcast_join_task(struct work_struct *work)
523 {
524 struct ipoib_dev_priv *priv =
525 container_of(work, struct ipoib_dev_priv, mcast_task.work);
526 struct net_device *dev = priv->dev;
527
528 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
529 return;
530
531 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
532 ipoib_warn(priv, "ib_gid_entry_get() failed\n");
533 else
534 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
535
536 {
537 struct ib_port_attr attr;
538
539 if (!ib_query_port(priv->ca, priv->port, &attr)) {
540 priv->local_lid = attr.lid;
541 priv->local_rate = attr.active_speed *
542 ib_width_enum_to_int(attr.active_width);
543 } else
544 ipoib_warn(priv, "ib_query_port failed\n");
545 }
546
547 if (!priv->broadcast) {
548 struct ipoib_mcast *broadcast;
549
550 broadcast = ipoib_mcast_alloc(dev, 1);
551 if (!broadcast) {
552 ipoib_warn(priv, "failed to allocate broadcast group\n");
553 mutex_lock(&mcast_mutex);
554 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
555 queue_delayed_work(ipoib_workqueue,
556 &priv->mcast_task, HZ);
557 mutex_unlock(&mcast_mutex);
558 return;
559 }
560
561 spin_lock_irq(&priv->lock);
562 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
563 sizeof (union ib_gid));
564 priv->broadcast = broadcast;
565
566 __ipoib_mcast_add(dev, priv->broadcast);
567 spin_unlock_irq(&priv->lock);
568 }
569
570 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
571 ipoib_mcast_join(dev, priv->broadcast, 0);
572 return;
573 }
574
575 while (1) {
576 struct ipoib_mcast *mcast = NULL;
577
578 spin_lock_irq(&priv->lock);
579 list_for_each_entry(mcast, &priv->multicast_list, list) {
580 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
581 && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
582 && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
583 /* Found the next unjoined group */
584 break;
585 }
586 }
587 spin_unlock_irq(&priv->lock);
588
589 if (&mcast->list == &priv->multicast_list) {
590 /* All done */
591 break;
592 }
593
594 ipoib_mcast_join(dev, mcast, 1);
595 return;
596 }
597
598 priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
599 IPOIB_ENCAP_LEN;
600 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
601
602 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
603
604 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
605 netif_carrier_on(dev);
606 }
607
608 int ipoib_mcast_start_thread(struct net_device *dev)
609 {
610 struct ipoib_dev_priv *priv = netdev_priv(dev);
611
612 ipoib_dbg_mcast(priv, "starting multicast thread\n");
613
614 mutex_lock(&mcast_mutex);
615 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
616 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
617 mutex_unlock(&mcast_mutex);
618
619 spin_lock_irq(&priv->lock);
620 set_bit(IPOIB_MCAST_STARTED, &priv->flags);
621 spin_unlock_irq(&priv->lock);
622
623 return 0;
624 }
625
626 static void wait_for_mcast_join(struct ipoib_dev_priv *priv,
627 struct ipoib_mcast *mcast)
628 {
629 spin_lock_irq(&priv->lock);
630 if (mcast && mcast->query) {
631 ib_sa_cancel_query(mcast->query_id, mcast->query);
632 mcast->query = NULL;
633 spin_unlock_irq(&priv->lock);
634 ipoib_dbg_mcast(priv, "waiting for MGID " IPOIB_GID_FMT "\n",
635 IPOIB_GID_ARG(mcast->mcmember.mgid));
636 wait_for_completion(&mcast->done);
637 }
638 else
639 spin_unlock_irq(&priv->lock);
640 }
641
642 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
643 {
644 struct ipoib_dev_priv *priv = netdev_priv(dev);
645 struct ipoib_mcast *mcast;
646
647 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
648
649 spin_lock_irq(&priv->lock);
650 clear_bit(IPOIB_MCAST_STARTED, &priv->flags);
651 spin_unlock_irq(&priv->lock);
652
653 mutex_lock(&mcast_mutex);
654 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
655 cancel_delayed_work(&priv->mcast_task);
656 mutex_unlock(&mcast_mutex);
657
658 if (flush)
659 flush_workqueue(ipoib_workqueue);
660
661 wait_for_mcast_join(priv, priv->broadcast);
662
663 list_for_each_entry(mcast, &priv->multicast_list, list)
664 wait_for_mcast_join(priv, mcast);
665
666 return 0;
667 }
668
669 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
670 {
671 struct ipoib_dev_priv *priv = netdev_priv(dev);
672 struct ib_sa_mcmember_rec rec = {
673 .join_state = 1
674 };
675 int ret = 0;
676
677 if (!test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags))
678 return 0;
679
680 ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
681 IPOIB_GID_ARG(mcast->mcmember.mgid));
682
683 rec.mgid = mcast->mcmember.mgid;
684 rec.port_gid = priv->local_gid;
685 rec.pkey = cpu_to_be16(priv->pkey);
686
687 /* Remove ourselves from the multicast group */
688 ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
689 &mcast->mcmember.mgid);
690 if (ret)
691 ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
692
693 /*
694 * Just make one shot at leaving and don't wait for a reply;
695 * if we fail, too bad.
696 */
697 ret = ib_sa_mcmember_rec_delete(&ipoib_sa_client, priv->ca, priv->port, &rec,
698 IB_SA_MCMEMBER_REC_MGID |
699 IB_SA_MCMEMBER_REC_PORT_GID |
700 IB_SA_MCMEMBER_REC_PKEY |
701 IB_SA_MCMEMBER_REC_JOIN_STATE,
702 0, GFP_ATOMIC, NULL,
703 mcast, &mcast->query);
704 if (ret < 0)
705 ipoib_warn(priv, "ib_sa_mcmember_rec_delete failed "
706 "for leave (result = %d)\n", ret);
707
708 return 0;
709 }
710
711 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
712 {
713 struct ipoib_dev_priv *priv = netdev_priv(dev);
714 struct ipoib_mcast *mcast;
715
716 /*
717 * We can only be called from ipoib_start_xmit, so we're
718 * inside tx_lock -- no need to save/restore flags.
719 */
720 spin_lock(&priv->lock);
721
722 if (!test_bit(IPOIB_MCAST_STARTED, &priv->flags) ||
723 !priv->broadcast ||
724 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
725 ++priv->stats.tx_dropped;
726 dev_kfree_skb_any(skb);
727 goto unlock;
728 }
729
730 mcast = __ipoib_mcast_find(dev, mgid);
731 if (!mcast) {
732 /* Let's create a new send only group now */
733 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
734 IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));
735
736 mcast = ipoib_mcast_alloc(dev, 0);
737 if (!mcast) {
738 ipoib_warn(priv, "unable to allocate memory for "
739 "multicast structure\n");
740 ++priv->stats.tx_dropped;
741 dev_kfree_skb_any(skb);
742 goto out;
743 }
744
745 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
746 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
747 __ipoib_mcast_add(dev, mcast);
748 list_add_tail(&mcast->list, &priv->multicast_list);
749 }
750
751 if (!mcast->ah) {
752 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
753 skb_queue_tail(&mcast->pkt_queue, skb);
754 else {
755 ++priv->stats.tx_dropped;
756 dev_kfree_skb_any(skb);
757 }
758
759 if (mcast->query)
760 ipoib_dbg_mcast(priv, "no address vector, "
761 "but multicast join already started\n");
762 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
763 ipoib_mcast_sendonly_join(mcast);
764
765 /*
766 * If lookup completes between here and out:, don't
767 * want to send packet twice.
768 */
769 mcast = NULL;
770 }
771
772 out:
773 if (mcast && mcast->ah) {
774 if (skb->dst &&
775 skb->dst->neighbour &&
776 !*to_ipoib_neigh(skb->dst->neighbour)) {
777 struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour);
778
779 if (neigh) {
780 kref_get(&mcast->ah->ref);
781 neigh->ah = mcast->ah;
782 list_add_tail(&neigh->list, &mcast->neigh_list);
783 }
784 }
785
786 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
787 }
788
789 unlock:
790 spin_unlock(&priv->lock);
791 }
792
793 void ipoib_mcast_dev_flush(struct net_device *dev)
794 {
795 struct ipoib_dev_priv *priv = netdev_priv(dev);
796 LIST_HEAD(remove_list);
797 struct ipoib_mcast *mcast, *tmcast;
798 unsigned long flags;
799
800 ipoib_dbg_mcast(priv, "flushing multicast list\n");
801
802 spin_lock_irqsave(&priv->lock, flags);
803
804 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
805 list_del(&mcast->list);
806 rb_erase(&mcast->rb_node, &priv->multicast_tree);
807 list_add_tail(&mcast->list, &remove_list);
808 }
809
810 if (priv->broadcast) {
811 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
812 list_add_tail(&priv->broadcast->list, &remove_list);
813 priv->broadcast = NULL;
814 }
815
816 spin_unlock_irqrestore(&priv->lock, flags);
817
818 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
819 ipoib_mcast_leave(dev, mcast);
820 ipoib_mcast_free(mcast);
821 }
822 }
823
824 void ipoib_mcast_restart_task(struct work_struct *work)
825 {
826 struct ipoib_dev_priv *priv =
827 container_of(work, struct ipoib_dev_priv, restart_task);
828 struct net_device *dev = 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 local_irq_save(flags);
839 netif_tx_lock(dev);
840 spin_lock(&priv->lock);
841
842 /*
843 * Unfortunately, the networking core only gives us a list of all of
844 * the multicast hardware addresses. We need to figure out which ones
845 * are new and which ones have been removed
846 */
847
848 /* Clear out the found flag */
849 list_for_each_entry(mcast, &priv->multicast_list, list)
850 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
851
852 /* Mark all of the entries that are found or don't exist */
853 for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
854 union ib_gid mgid;
855
856 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
857
858 /* Add in the P_Key */
859 mgid.raw[4] = (priv->pkey >> 8) & 0xff;
860 mgid.raw[5] = priv->pkey & 0xff;
861
862 mcast = __ipoib_mcast_find(dev, &mgid);
863 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
864 struct ipoib_mcast *nmcast;
865
866 /* Not found or send-only group, let's add a new entry */
867 ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
868 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
869
870 nmcast = ipoib_mcast_alloc(dev, 0);
871 if (!nmcast) {
872 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
873 continue;
874 }
875
876 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
877
878 nmcast->mcmember.mgid = mgid;
879
880 if (mcast) {
881 /* Destroy the send only entry */
882 list_move_tail(&mcast->list, &remove_list);
883
884 rb_replace_node(&mcast->rb_node,
885 &nmcast->rb_node,
886 &priv->multicast_tree);
887 } else
888 __ipoib_mcast_add(dev, nmcast);
889
890 list_add_tail(&nmcast->list, &priv->multicast_list);
891 }
892
893 if (mcast)
894 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
895 }
896
897 /* Remove all of the entries don't exist anymore */
898 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
899 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
900 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
901 ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
902 IPOIB_GID_ARG(mcast->mcmember.mgid));
903
904 rb_erase(&mcast->rb_node, &priv->multicast_tree);
905
906 /* Move to the remove list */
907 list_move_tail(&mcast->list, &remove_list);
908 }
909 }
910
911 spin_unlock(&priv->lock);
912 netif_tx_unlock(dev);
913 local_irq_restore(flags);
914
915 /* We have to cancel outside of the spinlock */
916 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
917 wait_for_mcast_join(priv, mcast);
918 ipoib_mcast_leave(mcast->dev, mcast);
919 ipoib_mcast_free(mcast);
920 }
921
922 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
923 ipoib_mcast_start_thread(dev);
924 }
925
926 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
927
928 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
929 {
930 struct ipoib_mcast_iter *iter;
931
932 iter = kmalloc(sizeof *iter, GFP_KERNEL);
933 if (!iter)
934 return NULL;
935
936 iter->dev = dev;
937 memset(iter->mgid.raw, 0, 16);
938
939 if (ipoib_mcast_iter_next(iter)) {
940 kfree(iter);
941 return NULL;
942 }
943
944 return iter;
945 }
946
947 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
948 {
949 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
950 struct rb_node *n;
951 struct ipoib_mcast *mcast;
952 int ret = 1;
953
954 spin_lock_irq(&priv->lock);
955
956 n = rb_first(&priv->multicast_tree);
957
958 while (n) {
959 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
960
961 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
962 sizeof (union ib_gid)) < 0) {
963 iter->mgid = mcast->mcmember.mgid;
964 iter->created = mcast->created;
965 iter->queuelen = skb_queue_len(&mcast->pkt_queue);
966 iter->complete = !!mcast->ah;
967 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
968
969 ret = 0;
970
971 break;
972 }
973
974 n = rb_next(n);
975 }
976
977 spin_unlock_irq(&priv->lock);
978
979 return ret;
980 }
981
982 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
983 union ib_gid *mgid,
984 unsigned long *created,
985 unsigned int *queuelen,
986 unsigned int *complete,
987 unsigned int *send_only)
988 {
989 *mgid = iter->mgid;
990 *created = iter->created;
991 *queuelen = iter->queuelen;
992 *complete = iter->complete;
993 *send_only = iter->send_only;
994 }
995
996 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
Linux kernel - Deliverables
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