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netdev: Add netdev->addr_list_lock protection.
[linux-2.6/btrfs-unstable.git] / drivers / infiniband / ulp / ipoib / ipoib_multicast.c
blob261ab7150431dd2a8bdc417235bd5fa50394637b
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 struct ipoib_mcast_iter {
61 struct net_device *dev;
62 union ib_gid mgid;
63 unsigned long created;
64 unsigned int queuelen;
65 unsigned int complete;
66 unsigned int send_only;
67 };
68
69 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
70 {
71 struct net_device *dev = mcast->dev;
72 struct ipoib_dev_priv *priv = netdev_priv(dev);
73 struct ipoib_neigh *neigh, *tmp;
74 unsigned long flags;
75 int tx_dropped = 0;
76
77 ipoib_dbg_mcast(netdev_priv(dev),
78 "deleting multicast group " IPOIB_GID_FMT "\n",
79 IPOIB_GID_ARG(mcast->mcmember.mgid));
80
81 spin_lock_irqsave(&priv->lock, flags);
82
83 list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
84 /*
85 * It's safe to call ipoib_put_ah() inside priv->lock
86 * here, because we know that mcast->ah will always
87 * hold one more reference, so ipoib_put_ah() will
88 * never do more than decrement the ref count.
89 */
90 if (neigh->ah)
91 ipoib_put_ah(neigh->ah);
92 ipoib_neigh_free(dev, neigh);
93 }
94
95 spin_unlock_irqrestore(&priv->lock, flags);
96
97 if (mcast->ah)
98 ipoib_put_ah(mcast->ah);
99
100 while (!skb_queue_empty(&mcast->pkt_queue)) {
101 ++tx_dropped;
102 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
103 }
104
105 spin_lock_irqsave(&priv->tx_lock, flags);
106 dev->stats.tx_dropped += tx_dropped;
107 spin_unlock_irqrestore(&priv->tx_lock, flags);
108
109 kfree(mcast);
110 }
111
112 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
113 int can_sleep)
114 {
115 struct ipoib_mcast *mcast;
116
117 mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
118 if (!mcast)
119 return NULL;
120
121 mcast->dev = dev;
122 mcast->created = jiffies;
123 mcast->backoff = 1;
124
125 INIT_LIST_HEAD(&mcast->list);
126 INIT_LIST_HEAD(&mcast->neigh_list);
127 skb_queue_head_init(&mcast->pkt_queue);
128
129 return mcast;
130 }
131
132 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
133 {
134 struct ipoib_dev_priv *priv = netdev_priv(dev);
135 struct rb_node *n = priv->multicast_tree.rb_node;
136
137 while (n) {
138 struct ipoib_mcast *mcast;
139 int ret;
140
141 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
142
143 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
144 sizeof (union ib_gid));
145 if (ret < 0)
146 n = n->rb_left;
147 else if (ret > 0)
148 n = n->rb_right;
149 else
150 return mcast;
151 }
152
153 return NULL;
154 }
155
156 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
157 {
158 struct ipoib_dev_priv *priv = netdev_priv(dev);
159 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
160
161 while (*n) {
162 struct ipoib_mcast *tmcast;
163 int ret;
164
165 pn = *n;
166 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
167
168 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
169 sizeof (union ib_gid));
170 if (ret < 0)
171 n = &pn->rb_left;
172 else if (ret > 0)
173 n = &pn->rb_right;
174 else
175 return -EEXIST;
176 }
177
178 rb_link_node(&mcast->rb_node, pn, n);
179 rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
180
181 return 0;
182 }
183
184 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
185 struct ib_sa_mcmember_rec *mcmember)
186 {
187 struct net_device *dev = mcast->dev;
188 struct ipoib_dev_priv *priv = netdev_priv(dev);
189 struct ipoib_ah *ah;
190 int ret;
191
192 mcast->mcmember = *mcmember;
193
194 /* Set the cached Q_Key before we attach if it's the broadcast group */
195 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
196 sizeof (union ib_gid))) {
197 spin_lock_irq(&priv->lock);
198 if (!priv->broadcast) {
199 spin_unlock_irq(&priv->lock);
200 return -EAGAIN;
201 }
202 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
203 spin_unlock_irq(&priv->lock);
204 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
205 }
206
207 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
208 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
209 ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
210 " already attached\n",
211 IPOIB_GID_ARG(mcast->mcmember.mgid));
212
213 return 0;
214 }
215
216 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
217 &mcast->mcmember.mgid);
218 if (ret < 0) {
219 ipoib_warn(priv, "couldn't attach QP to multicast group "
220 IPOIB_GID_FMT "\n",
221 IPOIB_GID_ARG(mcast->mcmember.mgid));
222
223 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
224 return ret;
225 }
226 }
227
228 {
229 struct ib_ah_attr av = {
230 .dlid = be16_to_cpu(mcast->mcmember.mlid),
231 .port_num = priv->port,
232 .sl = mcast->mcmember.sl,
233 .ah_flags = IB_AH_GRH,
234 .static_rate = mcast->mcmember.rate,
235 .grh = {
236 .flow_label = be32_to_cpu(mcast->mcmember.flow_label),
237 .hop_limit = mcast->mcmember.hop_limit,
238 .sgid_index = 0,
239 .traffic_class = mcast->mcmember.traffic_class
240 }
241 };
242 av.grh.dgid = mcast->mcmember.mgid;
243
244 ah = ipoib_create_ah(dev, priv->pd, &av);
245 if (!ah) {
246 ipoib_warn(priv, "ib_address_create failed\n");
247 } else {
248 spin_lock_irq(&priv->lock);
249 mcast->ah = ah;
250 spin_unlock_irq(&priv->lock);
251
252 ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
253 " AV %p, LID 0x%04x, SL %d\n",
254 IPOIB_GID_ARG(mcast->mcmember.mgid),
255 mcast->ah->ah,
256 be16_to_cpu(mcast->mcmember.mlid),
257 mcast->mcmember.sl);
258 }
259 }
260
261 /* actually send any queued packets */
262 spin_lock_irq(&priv->tx_lock);
263 while (!skb_queue_empty(&mcast->pkt_queue)) {
264 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
265 spin_unlock_irq(&priv->tx_lock);
266
267 skb->dev = dev;
268
269 if (!skb->dst || !skb->dst->neighbour) {
270 /* put pseudoheader back on for next time */
271 skb_push(skb, sizeof (struct ipoib_pseudoheader));
272 }
273
274 if (dev_queue_xmit(skb))
275 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
276 spin_lock_irq(&priv->tx_lock);
277 }
278 spin_unlock_irq(&priv->tx_lock);
279
280 return 0;
281 }
282
283 static int
284 ipoib_mcast_sendonly_join_complete(int status,
285 struct ib_sa_multicast *multicast)
286 {
287 struct ipoib_mcast *mcast = multicast->context;
288 struct net_device *dev = mcast->dev;
289 struct ipoib_dev_priv *priv = netdev_priv(dev);
290
291 /* We trap for port events ourselves. */
292 if (status == -ENETRESET)
293 return 0;
294
295 if (!status)
296 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
297
298 if (status) {
299 if (mcast->logcount++ < 20)
300 ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
301 IPOIB_GID_FMT ", status %d\n",
302 IPOIB_GID_ARG(mcast->mcmember.mgid), status);
303
304 /* Flush out any queued packets */
305 spin_lock_irq(&priv->tx_lock);
306 while (!skb_queue_empty(&mcast->pkt_queue)) {
307 ++dev->stats.tx_dropped;
308 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
309 }
310 spin_unlock_irq(&priv->tx_lock);
311
312 /* Clear the busy flag so we try again */
313 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
314 &mcast->flags);
315 }
316 return status;
317 }
318
319 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
320 {
321 struct net_device *dev = mcast->dev;
322 struct ipoib_dev_priv *priv = netdev_priv(dev);
323 struct ib_sa_mcmember_rec rec = {
324 #if 0 /* Some SMs don't support send-only yet */
325 .join_state = 4
326 #else
327 .join_state = 1
328 #endif
329 };
330 int ret = 0;
331
332 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
333 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
334 return -ENODEV;
335 }
336
337 if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
338 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
339 return -EBUSY;
340 }
341
342 rec.mgid = mcast->mcmember.mgid;
343 rec.port_gid = priv->local_gid;
344 rec.pkey = cpu_to_be16(priv->pkey);
345
346 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
347 priv->port, &rec,
348 IB_SA_MCMEMBER_REC_MGID |
349 IB_SA_MCMEMBER_REC_PORT_GID |
350 IB_SA_MCMEMBER_REC_PKEY |
351 IB_SA_MCMEMBER_REC_JOIN_STATE,
352 GFP_ATOMIC,
353 ipoib_mcast_sendonly_join_complete,
354 mcast);
355 if (IS_ERR(mcast->mc)) {
356 ret = PTR_ERR(mcast->mc);
357 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
358 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
359 ret);
360 } else {
361 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
362 ", starting join\n",
363 IPOIB_GID_ARG(mcast->mcmember.mgid));
364 }
365
366 return ret;
367 }
368
369 static int ipoib_mcast_join_complete(int status,
370 struct ib_sa_multicast *multicast)
371 {
372 struct ipoib_mcast *mcast = multicast->context;
373 struct net_device *dev = mcast->dev;
374 struct ipoib_dev_priv *priv = netdev_priv(dev);
375
376 ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
377 " (status %d)\n",
378 IPOIB_GID_ARG(mcast->mcmember.mgid), status);
379
380 /* We trap for port events ourselves. */
381 if (status == -ENETRESET)
382 return 0;
383
384 if (!status)
385 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
386
387 if (!status) {
388 mcast->backoff = 1;
389 mutex_lock(&mcast_mutex);
390 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
391 queue_delayed_work(ipoib_workqueue,
392 &priv->mcast_task, 0);
393 mutex_unlock(&mcast_mutex);
394
395 if (mcast == priv->broadcast)
396 netif_carrier_on(dev);
397
398 return 0;
399 }
400
401 if (mcast->logcount++ < 20) {
402 if (status == -ETIMEDOUT) {
403 ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
404 ", status %d\n",
405 IPOIB_GID_ARG(mcast->mcmember.mgid),
406 status);
407 } else {
408 ipoib_warn(priv, "multicast join failed for "
409 IPOIB_GID_FMT ", status %d\n",
410 IPOIB_GID_ARG(mcast->mcmember.mgid),
411 status);
412 }
413 }
414
415 mcast->backoff *= 2;
416 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
417 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
418
419 /* Clear the busy flag so we try again */
420 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
421
422 mutex_lock(&mcast_mutex);
423 spin_lock_irq(&priv->lock);
424 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
425 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
426 mcast->backoff * HZ);
427 spin_unlock_irq(&priv->lock);
428 mutex_unlock(&mcast_mutex);
429
430 return status;
431 }
432
433 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
434 int create)
435 {
436 struct ipoib_dev_priv *priv = netdev_priv(dev);
437 struct ib_sa_mcmember_rec rec = {
438 .join_state = 1
439 };
440 ib_sa_comp_mask comp_mask;
441 int ret = 0;
442
443 ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
444 IPOIB_GID_ARG(mcast->mcmember.mgid));
445
446 rec.mgid = mcast->mcmember.mgid;
447 rec.port_gid = priv->local_gid;
448 rec.pkey = cpu_to_be16(priv->pkey);
449
450 comp_mask =
451 IB_SA_MCMEMBER_REC_MGID |
452 IB_SA_MCMEMBER_REC_PORT_GID |
453 IB_SA_MCMEMBER_REC_PKEY |
454 IB_SA_MCMEMBER_REC_JOIN_STATE;
455
456 if (create) {
457 comp_mask |=
458 IB_SA_MCMEMBER_REC_QKEY |
459 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
460 IB_SA_MCMEMBER_REC_MTU |
461 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |
462 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
463 IB_SA_MCMEMBER_REC_RATE |
464 IB_SA_MCMEMBER_REC_SL |
465 IB_SA_MCMEMBER_REC_FLOW_LABEL |
466 IB_SA_MCMEMBER_REC_HOP_LIMIT;
467
468 rec.qkey = priv->broadcast->mcmember.qkey;
469 rec.mtu_selector = IB_SA_EQ;
470 rec.mtu = priv->broadcast->mcmember.mtu;
471 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
472 rec.rate_selector = IB_SA_EQ;
473 rec.rate = priv->broadcast->mcmember.rate;
474 rec.sl = priv->broadcast->mcmember.sl;
475 rec.flow_label = priv->broadcast->mcmember.flow_label;
476 rec.hop_limit = priv->broadcast->mcmember.hop_limit;
477 }
478
479 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
480 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
481 &rec, comp_mask, GFP_KERNEL,
482 ipoib_mcast_join_complete, mcast);
483 if (IS_ERR(mcast->mc)) {
484 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
485 ret = PTR_ERR(mcast->mc);
486 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
487
488 mcast->backoff *= 2;
489 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
490 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
491
492 mutex_lock(&mcast_mutex);
493 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
494 queue_delayed_work(ipoib_workqueue,
495 &priv->mcast_task,
496 mcast->backoff * HZ);
497 mutex_unlock(&mcast_mutex);
498 }
499 }
500
501 void ipoib_mcast_join_task(struct work_struct *work)
502 {
503 struct ipoib_dev_priv *priv =
504 container_of(work, struct ipoib_dev_priv, mcast_task.work);
505 struct net_device *dev = priv->dev;
506
507 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
508 return;
509
510 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
511 ipoib_warn(priv, "ib_query_gid() failed\n");
512 else
513 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
514
515 {
516 struct ib_port_attr attr;
517
518 if (!ib_query_port(priv->ca, priv->port, &attr))
519 priv->local_lid = attr.lid;
520 else
521 ipoib_warn(priv, "ib_query_port failed\n");
522 }
523
524 if (!priv->broadcast) {
525 struct ipoib_mcast *broadcast;
526
527 broadcast = ipoib_mcast_alloc(dev, 1);
528 if (!broadcast) {
529 ipoib_warn(priv, "failed to allocate broadcast group\n");
530 mutex_lock(&mcast_mutex);
531 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
532 queue_delayed_work(ipoib_workqueue,
533 &priv->mcast_task, HZ);
534 mutex_unlock(&mcast_mutex);
535 return;
536 }
537
538 spin_lock_irq(&priv->lock);
539 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
540 sizeof (union ib_gid));
541 priv->broadcast = broadcast;
542
543 __ipoib_mcast_add(dev, priv->broadcast);
544 spin_unlock_irq(&priv->lock);
545 }
546
547 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
548 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
549 ipoib_mcast_join(dev, priv->broadcast, 0);
550 return;
551 }
552
553 while (1) {
554 struct ipoib_mcast *mcast = NULL;
555
556 spin_lock_irq(&priv->lock);
557 list_for_each_entry(mcast, &priv->multicast_list, list) {
558 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
559 && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
560 && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
561 /* Found the next unjoined group */
562 break;
563 }
564 }
565 spin_unlock_irq(&priv->lock);
566
567 if (&mcast->list == &priv->multicast_list) {
568 /* All done */
569 break;
570 }
571
572 ipoib_mcast_join(dev, mcast, 1);
573 return;
574 }
575
576 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
577
578 if (!ipoib_cm_admin_enabled(dev))
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 }
585
586 int ipoib_mcast_start_thread(struct net_device *dev)
587 {
588 struct ipoib_dev_priv *priv = netdev_priv(dev);
589
590 ipoib_dbg_mcast(priv, "starting multicast thread\n");
591
592 mutex_lock(&mcast_mutex);
593 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
594 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
595 mutex_unlock(&mcast_mutex);
596
597 spin_lock_irq(&priv->lock);
598 set_bit(IPOIB_MCAST_STARTED, &priv->flags);
599 spin_unlock_irq(&priv->lock);
600
601 return 0;
602 }
603
604 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
605 {
606 struct ipoib_dev_priv *priv = netdev_priv(dev);
607
608 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
609
610 spin_lock_irq(&priv->lock);
611 clear_bit(IPOIB_MCAST_STARTED, &priv->flags);
612 spin_unlock_irq(&priv->lock);
613
614 mutex_lock(&mcast_mutex);
615 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
616 cancel_delayed_work(&priv->mcast_task);
617 mutex_unlock(&mcast_mutex);
618
619 if (flush)
620 flush_workqueue(ipoib_workqueue);
621
622 return 0;
623 }
624
625 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
626 {
627 struct ipoib_dev_priv *priv = netdev_priv(dev);
628 int ret = 0;
629
630 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
631 ib_sa_free_multicast(mcast->mc);
632
633 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
634 ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
635 IPOIB_GID_ARG(mcast->mcmember.mgid));
636
637 /* Remove ourselves from the multicast group */
638 ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
639 &mcast->mcmember.mgid);
640 if (ret)
641 ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
642 }
643
644 return 0;
645 }
646
647 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
648 {
649 struct ipoib_dev_priv *priv = netdev_priv(dev);
650 struct ipoib_mcast *mcast;
651
652 /*
653 * We can only be called from ipoib_start_xmit, so we're
654 * inside tx_lock -- no need to save/restore flags.
655 */
656 spin_lock(&priv->lock);
657
658 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) ||
659 !priv->broadcast ||
660 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
661 ++dev->stats.tx_dropped;
662 dev_kfree_skb_any(skb);
663 goto unlock;
664 }
665
666 mcast = __ipoib_mcast_find(dev, mgid);
667 if (!mcast) {
668 /* Let's create a new send only group now */
669 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
670 IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));
671
672 mcast = ipoib_mcast_alloc(dev, 0);
673 if (!mcast) {
674 ipoib_warn(priv, "unable to allocate memory for "
675 "multicast structure\n");
676 ++dev->stats.tx_dropped;
677 dev_kfree_skb_any(skb);
678 goto out;
679 }
680
681 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
682 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
683 __ipoib_mcast_add(dev, mcast);
684 list_add_tail(&mcast->list, &priv->multicast_list);
685 }
686
687 if (!mcast->ah) {
688 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
689 skb_queue_tail(&mcast->pkt_queue, skb);
690 else {
691 ++dev->stats.tx_dropped;
692 dev_kfree_skb_any(skb);
693 }
694
695 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
696 ipoib_dbg_mcast(priv, "no address vector, "
697 "but multicast join already started\n");
698 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
699 ipoib_mcast_sendonly_join(mcast);
700
701 /*
702 * If lookup completes between here and out:, don't
703 * want to send packet twice.
704 */
705 mcast = NULL;
706 }
707
708 out:
709 if (mcast && mcast->ah) {
710 if (skb->dst &&
711 skb->dst->neighbour &&
712 !*to_ipoib_neigh(skb->dst->neighbour)) {
713 struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour,
714 skb->dev);
715
716 if (neigh) {
717 kref_get(&mcast->ah->ref);
718 neigh->ah = mcast->ah;
719 list_add_tail(&neigh->list, &mcast->neigh_list);
720 }
721 }
722
723 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
724 }
725
726 unlock:
727 spin_unlock(&priv->lock);
728 }
729
730 void ipoib_mcast_dev_flush(struct net_device *dev)
731 {
732 struct ipoib_dev_priv *priv = netdev_priv(dev);
733 LIST_HEAD(remove_list);
734 struct ipoib_mcast *mcast, *tmcast;
735 unsigned long flags;
736
737 ipoib_dbg_mcast(priv, "flushing multicast list\n");
738
739 spin_lock_irqsave(&priv->lock, flags);
740
741 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
742 list_del(&mcast->list);
743 rb_erase(&mcast->rb_node, &priv->multicast_tree);
744 list_add_tail(&mcast->list, &remove_list);
745 }
746
747 if (priv->broadcast) {
748 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
749 list_add_tail(&priv->broadcast->list, &remove_list);
750 priv->broadcast = NULL;
751 }
752
753 spin_unlock_irqrestore(&priv->lock, flags);
754
755 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
756 ipoib_mcast_leave(dev, mcast);
757 ipoib_mcast_free(mcast);
758 }
759 }
760
761 void ipoib_mcast_restart_task(struct work_struct *work)
762 {
763 struct ipoib_dev_priv *priv =
764 container_of(work, struct ipoib_dev_priv, restart_task);
765 struct net_device *dev = priv->dev;
766 struct dev_mc_list *mclist;
767 struct ipoib_mcast *mcast, *tmcast;
768 LIST_HEAD(remove_list);
769 unsigned long flags;
770 struct ib_sa_mcmember_rec rec;
771
772 ipoib_dbg_mcast(priv, "restarting multicast task\n");
773
774 ipoib_mcast_stop_thread(dev, 0);
775
776 local_irq_save(flags);
777 netif_tx_lock(dev);
778 netif_addr_lock(dev);
779 spin_lock(&priv->lock);
780
781 /*
782 * Unfortunately, the networking core only gives us a list of all of
783 * the multicast hardware addresses. We need to figure out which ones
784 * are new and which ones have been removed
785 */
786
787 /* Clear out the found flag */
788 list_for_each_entry(mcast, &priv->multicast_list, list)
789 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
790
791 /* Mark all of the entries that are found or don't exist */
792 for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
793 union ib_gid mgid;
794
795 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
796
797 mcast = __ipoib_mcast_find(dev, &mgid);
798 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
799 struct ipoib_mcast *nmcast;
800
801 /* ignore group which is directly joined by userspace */
802 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
803 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
804 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid "
805 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
806 continue;
807 }
808
809 /* Not found or send-only group, let's add a new entry */
810 ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
811 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
812
813 nmcast = ipoib_mcast_alloc(dev, 0);
814 if (!nmcast) {
815 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
816 continue;
817 }
818
819 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
820
821 nmcast->mcmember.mgid = mgid;
822
823 if (mcast) {
824 /* Destroy the send only entry */
825 list_move_tail(&mcast->list, &remove_list);
826
827 rb_replace_node(&mcast->rb_node,
828 &nmcast->rb_node,
829 &priv->multicast_tree);
830 } else
831 __ipoib_mcast_add(dev, nmcast);
832
833 list_add_tail(&nmcast->list, &priv->multicast_list);
834 }
835
836 if (mcast)
837 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
838 }
839
840 /* Remove all of the entries don't exist anymore */
841 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
842 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
843 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
844 ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
845 IPOIB_GID_ARG(mcast->mcmember.mgid));
846
847 rb_erase(&mcast->rb_node, &priv->multicast_tree);
848
849 /* Move to the remove list */
850 list_move_tail(&mcast->list, &remove_list);
851 }
852 }
853
854 spin_unlock(&priv->lock);
855 netif_addr_unlock(dev);
856 netif_tx_unlock(dev);
857 local_irq_restore(flags);
858
859 /* We have to cancel outside of the spinlock */
860 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
861 ipoib_mcast_leave(mcast->dev, mcast);
862 ipoib_mcast_free(mcast);
863 }
864
865 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
866 ipoib_mcast_start_thread(dev);
867 }
868
869 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
870
871 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
872 {
873 struct ipoib_mcast_iter *iter;
874
875 iter = kmalloc(sizeof *iter, GFP_KERNEL);
876 if (!iter)
877 return NULL;
878
879 iter->dev = dev;
880 memset(iter->mgid.raw, 0, 16);
881
882 if (ipoib_mcast_iter_next(iter)) {
883 kfree(iter);
884 return NULL;
885 }
886
887 return iter;
888 }
889
890 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
891 {
892 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
893 struct rb_node *n;
894 struct ipoib_mcast *mcast;
895 int ret = 1;
896
897 spin_lock_irq(&priv->lock);
898
899 n = rb_first(&priv->multicast_tree);
900
901 while (n) {
902 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
903
904 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
905 sizeof (union ib_gid)) < 0) {
906 iter->mgid = mcast->mcmember.mgid;
907 iter->created = mcast->created;
908 iter->queuelen = skb_queue_len(&mcast->pkt_queue);
909 iter->complete = !!mcast->ah;
910 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
911
912 ret = 0;
913
914 break;
915 }
916
917 n = rb_next(n);
918 }
919
920 spin_unlock_irq(&priv->lock);
921
922 return ret;
923 }
924
925 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
926 union ib_gid *mgid,
927 unsigned long *created,
928 unsigned int *queuelen,
929 unsigned int *complete,
930 unsigned int *send_only)
931 {
932 *mgid = iter->mgid;
933 *created = iter->created;
934 *queuelen = iter->queuelen;
935 *complete = iter->complete;
936 *send_only = iter->send_only;
937 }
938
939 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
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