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IPoIB: Fix skb leak when freeing neighbour
[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_work(ipoib_workqueue, &priv->mcast_task);
403 mutex_unlock(&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 mutex_lock(&mcast_mutex);
432
433 spin_lock_irq(&priv->lock);
434 mcast->query = NULL;
435
436 if (test_bit(IPOIB_MCAST_RUN, &priv->flags)) {
437 if (status == -ETIMEDOUT)
438 queue_work(ipoib_workqueue, &priv->mcast_task);
439 else
440 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
441 mcast->backoff * HZ);
442 } else
443 complete(&mcast->done);
444 spin_unlock_irq(&priv->lock);
445 mutex_unlock(&mcast_mutex);
446
447 return;
448 }
449
450 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
451 int create)
452 {
453 struct ipoib_dev_priv *priv = netdev_priv(dev);
454 struct ib_sa_mcmember_rec rec = {
455 .join_state = 1
456 };
457 ib_sa_comp_mask comp_mask;
458 int ret = 0;
459
460 ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
461 IPOIB_GID_ARG(mcast->mcmember.mgid));
462
463 rec.mgid = mcast->mcmember.mgid;
464 rec.port_gid = priv->local_gid;
465 rec.pkey = cpu_to_be16(priv->pkey);
466
467 comp_mask =
468 IB_SA_MCMEMBER_REC_MGID |
469 IB_SA_MCMEMBER_REC_PORT_GID |
470 IB_SA_MCMEMBER_REC_PKEY |
471 IB_SA_MCMEMBER_REC_JOIN_STATE;
472
473 if (create) {
474 comp_mask |=
475 IB_SA_MCMEMBER_REC_QKEY |
476 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
477 IB_SA_MCMEMBER_REC_MTU |
478 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |
479 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
480 IB_SA_MCMEMBER_REC_RATE |
481 IB_SA_MCMEMBER_REC_SL |
482 IB_SA_MCMEMBER_REC_FLOW_LABEL |
483 IB_SA_MCMEMBER_REC_HOP_LIMIT;
484
485 rec.qkey = priv->broadcast->mcmember.qkey;
486 rec.mtu_selector = IB_SA_EQ;
487 rec.mtu = priv->broadcast->mcmember.mtu;
488 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
489 rec.rate_selector = IB_SA_EQ;
490 rec.rate = priv->broadcast->mcmember.rate;
491 rec.sl = priv->broadcast->mcmember.sl;
492 rec.flow_label = priv->broadcast->mcmember.flow_label;
493 rec.hop_limit = priv->broadcast->mcmember.hop_limit;
494 }
495
496 init_completion(&mcast->done);
497
498 ret = ib_sa_mcmember_rec_set(&ipoib_sa_client, priv->ca, priv->port,
499 &rec, comp_mask, mcast->backoff * 1000,
500 GFP_ATOMIC, ipoib_mcast_join_complete,
501 mcast, &mcast->query);
502
503 if (ret < 0) {
504 ipoib_warn(priv, "ib_sa_mcmember_rec_set failed, status %d\n", ret);
505
506 mcast->backoff *= 2;
507 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
508 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
509
510 mutex_lock(&mcast_mutex);
511 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
512 queue_delayed_work(ipoib_workqueue,
513 &priv->mcast_task,
514 mcast->backoff * HZ);
515 mutex_unlock(&mcast_mutex);
516 } else
517 mcast->query_id = ret;
518 }
519
520 void ipoib_mcast_join_task(void *dev_ptr)
521 {
522 struct net_device *dev = dev_ptr;
523 struct ipoib_dev_priv *priv = netdev_priv(dev);
524
525 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
526 return;
527
528 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
529 ipoib_warn(priv, "ib_gid_entry_get() failed\n");
530 else
531 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
532
533 {
534 struct ib_port_attr attr;
535
536 if (!ib_query_port(priv->ca, priv->port, &attr)) {
537 priv->local_lid = attr.lid;
538 priv->local_rate = attr.active_speed *
539 ib_width_enum_to_int(attr.active_width);
540 } else
541 ipoib_warn(priv, "ib_query_port failed\n");
542 }
543
544 if (!priv->broadcast) {
545 struct ipoib_mcast *broadcast;
546
547 broadcast = ipoib_mcast_alloc(dev, 1);
548 if (!broadcast) {
549 ipoib_warn(priv, "failed to allocate broadcast group\n");
550 mutex_lock(&mcast_mutex);
551 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
552 queue_delayed_work(ipoib_workqueue,
553 &priv->mcast_task, HZ);
554 mutex_unlock(&mcast_mutex);
555 return;
556 }
557
558 spin_lock_irq(&priv->lock);
559 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
560 sizeof (union ib_gid));
561 priv->broadcast = broadcast;
562
563 __ipoib_mcast_add(dev, priv->broadcast);
564 spin_unlock_irq(&priv->lock);
565 }
566
567 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
568 ipoib_mcast_join(dev, priv->broadcast, 0);
569 return;
570 }
571
572 while (1) {
573 struct ipoib_mcast *mcast = NULL;
574
575 spin_lock_irq(&priv->lock);
576 list_for_each_entry(mcast, &priv->multicast_list, list) {
577 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
578 && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
579 && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
580 /* Found the next unjoined group */
581 break;
582 }
583 }
584 spin_unlock_irq(&priv->lock);
585
586 if (&mcast->list == &priv->multicast_list) {
587 /* All done */
588 break;
589 }
590
591 ipoib_mcast_join(dev, mcast, 1);
592 return;
593 }
594
595 priv->mcast_mtu = ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu) -
596 IPOIB_ENCAP_LEN;
597 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
598
599 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
600
601 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
602 netif_carrier_on(dev);
603 }
604
605 int ipoib_mcast_start_thread(struct net_device *dev)
606 {
607 struct ipoib_dev_priv *priv = netdev_priv(dev);
608
609 ipoib_dbg_mcast(priv, "starting multicast thread\n");
610
611 mutex_lock(&mcast_mutex);
612 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
613 queue_work(ipoib_workqueue, &priv->mcast_task);
614 mutex_unlock(&mcast_mutex);
615
616 spin_lock_irq(&priv->lock);
617 set_bit(IPOIB_MCAST_STARTED, &priv->flags);
618 spin_unlock_irq(&priv->lock);
619
620 return 0;
621 }
622
623 static void wait_for_mcast_join(struct ipoib_dev_priv *priv,
624 struct ipoib_mcast *mcast)
625 {
626 spin_lock_irq(&priv->lock);
627 if (mcast && mcast->query) {
628 ib_sa_cancel_query(mcast->query_id, mcast->query);
629 mcast->query = NULL;
630 spin_unlock_irq(&priv->lock);
631 ipoib_dbg_mcast(priv, "waiting for MGID " IPOIB_GID_FMT "\n",
632 IPOIB_GID_ARG(mcast->mcmember.mgid));
633 wait_for_completion(&mcast->done);
634 }
635 else
636 spin_unlock_irq(&priv->lock);
637 }
638
639 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
640 {
641 struct ipoib_dev_priv *priv = netdev_priv(dev);
642 struct ipoib_mcast *mcast;
643
644 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
645
646 spin_lock_irq(&priv->lock);
647 clear_bit(IPOIB_MCAST_STARTED, &priv->flags);
648 spin_unlock_irq(&priv->lock);
649
650 mutex_lock(&mcast_mutex);
651 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
652 cancel_delayed_work(&priv->mcast_task);
653 mutex_unlock(&mcast_mutex);
654
655 if (flush)
656 flush_workqueue(ipoib_workqueue);
657
658 wait_for_mcast_join(priv, priv->broadcast);
659
660 list_for_each_entry(mcast, &priv->multicast_list, list)
661 wait_for_mcast_join(priv, mcast);
662
663 return 0;
664 }
665
666 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
667 {
668 struct ipoib_dev_priv *priv = netdev_priv(dev);
669 struct ib_sa_mcmember_rec rec = {
670 .join_state = 1
671 };
672 int ret = 0;
673
674 if (!test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags))
675 return 0;
676
677 ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
678 IPOIB_GID_ARG(mcast->mcmember.mgid));
679
680 rec.mgid = mcast->mcmember.mgid;
681 rec.port_gid = priv->local_gid;
682 rec.pkey = cpu_to_be16(priv->pkey);
683
684 /* Remove ourselves from the multicast group */
685 ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
686 &mcast->mcmember.mgid);
687 if (ret)
688 ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
689
690 /*
691 * Just make one shot at leaving and don't wait for a reply;
692 * if we fail, too bad.
693 */
694 ret = ib_sa_mcmember_rec_delete(&ipoib_sa_client, priv->ca, priv->port, &rec,
695 IB_SA_MCMEMBER_REC_MGID |
696 IB_SA_MCMEMBER_REC_PORT_GID |
697 IB_SA_MCMEMBER_REC_PKEY |
698 IB_SA_MCMEMBER_REC_JOIN_STATE,
699 0, GFP_ATOMIC, NULL,
700 mcast, &mcast->query);
701 if (ret < 0)
702 ipoib_warn(priv, "ib_sa_mcmember_rec_delete failed "
703 "for leave (result = %d)\n", ret);
704
705 return 0;
706 }
707
708 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
709 {
710 struct ipoib_dev_priv *priv = netdev_priv(dev);
711 struct ipoib_mcast *mcast;
712
713 /*
714 * We can only be called from ipoib_start_xmit, so we're
715 * inside tx_lock -- no need to save/restore flags.
716 */
717 spin_lock(&priv->lock);
718
719 if (!test_bit(IPOIB_MCAST_STARTED, &priv->flags) ||
720 !priv->broadcast ||
721 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
722 ++priv->stats.tx_dropped;
723 dev_kfree_skb_any(skb);
724 goto unlock;
725 }
726
727 mcast = __ipoib_mcast_find(dev, mgid);
728 if (!mcast) {
729 /* Let's create a new send only group now */
730 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
731 IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));
732
733 mcast = ipoib_mcast_alloc(dev, 0);
734 if (!mcast) {
735 ipoib_warn(priv, "unable to allocate memory for "
736 "multicast structure\n");
737 ++priv->stats.tx_dropped;
738 dev_kfree_skb_any(skb);
739 goto out;
740 }
741
742 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
743 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
744 __ipoib_mcast_add(dev, mcast);
745 list_add_tail(&mcast->list, &priv->multicast_list);
746 }
747
748 if (!mcast->ah) {
749 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
750 skb_queue_tail(&mcast->pkt_queue, skb);
751 else {
752 ++priv->stats.tx_dropped;
753 dev_kfree_skb_any(skb);
754 }
755
756 if (mcast->query)
757 ipoib_dbg_mcast(priv, "no address vector, "
758 "but multicast join already started\n");
759 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
760 ipoib_mcast_sendonly_join(mcast);
761
762 /*
763 * If lookup completes between here and out:, don't
764 * want to send packet twice.
765 */
766 mcast = NULL;
767 }
768
769 out:
770 if (mcast && mcast->ah) {
771 if (skb->dst &&
772 skb->dst->neighbour &&
773 !*to_ipoib_neigh(skb->dst->neighbour)) {
774 struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour);
775
776 if (neigh) {
777 kref_get(&mcast->ah->ref);
778 neigh->ah = mcast->ah;
779 list_add_tail(&neigh->list, &mcast->neigh_list);
780 }
781 }
782
783 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
784 }
785
786 unlock:
787 spin_unlock(&priv->lock);
788 }
789
790 void ipoib_mcast_dev_flush(struct net_device *dev)
791 {
792 struct ipoib_dev_priv *priv = netdev_priv(dev);
793 LIST_HEAD(remove_list);
794 struct ipoib_mcast *mcast, *tmcast;
795 unsigned long flags;
796
797 ipoib_dbg_mcast(priv, "flushing multicast list\n");
798
799 spin_lock_irqsave(&priv->lock, flags);
800
801 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
802 list_del(&mcast->list);
803 rb_erase(&mcast->rb_node, &priv->multicast_tree);
804 list_add_tail(&mcast->list, &remove_list);
805 }
806
807 if (priv->broadcast) {
808 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
809 list_add_tail(&priv->broadcast->list, &remove_list);
810 priv->broadcast = NULL;
811 }
812
813 spin_unlock_irqrestore(&priv->lock, flags);
814
815 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
816 ipoib_mcast_leave(dev, mcast);
817 ipoib_mcast_free(mcast);
818 }
819 }
820
821 void ipoib_mcast_restart_task(void *dev_ptr)
822 {
823 struct net_device *dev = dev_ptr;
824 struct ipoib_dev_priv *priv = netdev_priv(dev);
825 struct dev_mc_list *mclist;
826 struct ipoib_mcast *mcast, *tmcast;
827 LIST_HEAD(remove_list);
828 unsigned long flags;
829
830 ipoib_dbg_mcast(priv, "restarting multicast task\n");
831
832 ipoib_mcast_stop_thread(dev, 0);
833
834 local_irq_save(flags);
835 netif_tx_lock(dev);
836 spin_lock(&priv->lock);
837
838 /*
839 * Unfortunately, the networking core only gives us a list of all of
840 * the multicast hardware addresses. We need to figure out which ones
841 * are new and which ones have been removed
842 */
843
844 /* Clear out the found flag */
845 list_for_each_entry(mcast, &priv->multicast_list, list)
846 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
847
848 /* Mark all of the entries that are found or don't exist */
849 for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
850 union ib_gid mgid;
851
852 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
853
854 /* Add in the P_Key */
855 mgid.raw[4] = (priv->pkey >> 8) & 0xff;
856 mgid.raw[5] = priv->pkey & 0xff;
857
858 mcast = __ipoib_mcast_find(dev, &mgid);
859 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
860 struct ipoib_mcast *nmcast;
861
862 /* Not found or send-only group, let's add a new entry */
863 ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
864 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
865
866 nmcast = ipoib_mcast_alloc(dev, 0);
867 if (!nmcast) {
868 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
869 continue;
870 }
871
872 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
873
874 nmcast->mcmember.mgid = mgid;
875
876 if (mcast) {
877 /* Destroy the send only entry */
878 list_move_tail(&mcast->list, &remove_list);
879
880 rb_replace_node(&mcast->rb_node,
881 &nmcast->rb_node,
882 &priv->multicast_tree);
883 } else
884 __ipoib_mcast_add(dev, nmcast);
885
886 list_add_tail(&nmcast->list, &priv->multicast_list);
887 }
888
889 if (mcast)
890 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
891 }
892
893 /* Remove all of the entries don't exist anymore */
894 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
895 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
896 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
897 ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
898 IPOIB_GID_ARG(mcast->mcmember.mgid));
899
900 rb_erase(&mcast->rb_node, &priv->multicast_tree);
901
902 /* Move to the remove list */
903 list_move_tail(&mcast->list, &remove_list);
904 }
905 }
906
907 spin_unlock(&priv->lock);
908 netif_tx_unlock(dev);
909 local_irq_restore(flags);
910
911 /* We have to cancel outside of the spinlock */
912 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
913 wait_for_mcast_join(priv, mcast);
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 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
923
924 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
925 {
926 struct ipoib_mcast_iter *iter;
927
928 iter = kmalloc(sizeof *iter, GFP_KERNEL);
929 if (!iter)
930 return NULL;
931
932 iter->dev = dev;
933 memset(iter->mgid.raw, 0, 16);
934
935 if (ipoib_mcast_iter_next(iter)) {
936 kfree(iter);
937 return NULL;
938 }
939
940 return iter;
941 }
942
943 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
944 {
945 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
946 struct rb_node *n;
947 struct ipoib_mcast *mcast;
948 int ret = 1;
949
950 spin_lock_irq(&priv->lock);
951
952 n = rb_first(&priv->multicast_tree);
953
954 while (n) {
955 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
956
957 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
958 sizeof (union ib_gid)) < 0) {
959 iter->mgid = mcast->mcmember.mgid;
960 iter->created = mcast->created;
961 iter->queuelen = skb_queue_len(&mcast->pkt_queue);
962 iter->complete = !!mcast->ah;
963 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
964
965 ret = 0;
966
967 break;
968 }
969
970 n = rb_next(n);
971 }
972
973 spin_unlock_irq(&priv->lock);
974
975 return ret;
976 }
977
978 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
979 union ib_gid *mgid,
980 unsigned long *created,
981 unsigned int *queuelen,
982 unsigned int *complete,
983 unsigned int *send_only)
984 {
985 *mgid = iter->mgid;
986 *created = iter->created;
987 *queuelen = iter->queuelen;
988 *complete = iter->complete;
989 *send_only = iter->send_only;
990 }
991
992 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
Linux kernel - Deliverables
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