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IPoIB: fix mcast_dev_flush/mcast_restart_task race
[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
35 #include <linux/skbuff.h>
36 #include <linux/rtnetlink.h>
37 #include <linux/moduleparam.h>
38 #include <linux/ip.h>
39 #include <linux/in.h>
40 #include <linux/igmp.h>
41 #include <linux/inetdevice.h>
42 #include <linux/delay.h>
43 #include <linux/completion.h>
44 #include <linux/slab.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 int tx_dropped = 0;
73
74 ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n",
75 mcast->mcmember.mgid.raw);
76
77 /* remove all neigh connected to this mcast */
78 ipoib_del_neighs_by_gid(dev, mcast->mcmember.mgid.raw);
79
80 if (mcast->ah)
81 ipoib_put_ah(mcast->ah);
82
83 while (!skb_queue_empty(&mcast->pkt_queue)) {
84 ++tx_dropped;
85 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
86 }
87
88 netif_tx_lock_bh(dev);
89 dev->stats.tx_dropped += tx_dropped;
90 netif_tx_unlock_bh(dev);
91
92 kfree(mcast);
93 }
94
95 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
96 int can_sleep)
97 {
98 struct ipoib_mcast *mcast;
99
100 mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
101 if (!mcast)
102 return NULL;
103
104 mcast->dev = dev;
105 mcast->created = jiffies;
106 mcast->backoff = 1;
107
108 INIT_LIST_HEAD(&mcast->list);
109 INIT_LIST_HEAD(&mcast->neigh_list);
110 skb_queue_head_init(&mcast->pkt_queue);
111
112 return mcast;
113 }
114
115 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
116 {
117 struct ipoib_dev_priv *priv = netdev_priv(dev);
118 struct rb_node *n = priv->multicast_tree.rb_node;
119
120 while (n) {
121 struct ipoib_mcast *mcast;
122 int ret;
123
124 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
125
126 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
127 sizeof (union ib_gid));
128 if (ret < 0)
129 n = n->rb_left;
130 else if (ret > 0)
131 n = n->rb_right;
132 else
133 return mcast;
134 }
135
136 return NULL;
137 }
138
139 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
140 {
141 struct ipoib_dev_priv *priv = netdev_priv(dev);
142 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
143
144 while (*n) {
145 struct ipoib_mcast *tmcast;
146 int ret;
147
148 pn = *n;
149 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
150
151 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
152 sizeof (union ib_gid));
153 if (ret < 0)
154 n = &pn->rb_left;
155 else if (ret > 0)
156 n = &pn->rb_right;
157 else
158 return -EEXIST;
159 }
160
161 rb_link_node(&mcast->rb_node, pn, n);
162 rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
163
164 return 0;
165 }
166
167 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
168 struct ib_sa_mcmember_rec *mcmember)
169 {
170 struct net_device *dev = mcast->dev;
171 struct ipoib_dev_priv *priv = netdev_priv(dev);
172 struct ipoib_ah *ah;
173 int ret;
174 int set_qkey = 0;
175
176 mcast->mcmember = *mcmember;
177
178 /* Set the multicast MTU and cached Q_Key before we attach if it's
179 * the broadcast group.
180 */
181 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
182 sizeof (union ib_gid))) {
183 spin_lock_irq(&priv->lock);
184 if (!priv->broadcast) {
185 spin_unlock_irq(&priv->lock);
186 return -EAGAIN;
187 }
188 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
189 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
190 spin_unlock_irq(&priv->lock);
191 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
192 set_qkey = 1;
193 }
194
195 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
196 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
197 ipoib_warn(priv, "multicast group %pI6 already attached\n",
198 mcast->mcmember.mgid.raw);
199
200 return 0;
201 }
202
203 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
204 &mcast->mcmember.mgid, set_qkey);
205 if (ret < 0) {
206 ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
207 mcast->mcmember.mgid.raw);
208
209 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
210 return ret;
211 }
212 }
213
214 {
215 struct ib_ah_attr av = {
216 .dlid = be16_to_cpu(mcast->mcmember.mlid),
217 .port_num = priv->port,
218 .sl = mcast->mcmember.sl,
219 .ah_flags = IB_AH_GRH,
220 .static_rate = mcast->mcmember.rate,
221 .grh = {
222 .flow_label = be32_to_cpu(mcast->mcmember.flow_label),
223 .hop_limit = mcast->mcmember.hop_limit,
224 .sgid_index = 0,
225 .traffic_class = mcast->mcmember.traffic_class
226 }
227 };
228 av.grh.dgid = mcast->mcmember.mgid;
229
230 ah = ipoib_create_ah(dev, priv->pd, &av);
231 if (IS_ERR(ah)) {
232 ipoib_warn(priv, "ib_address_create failed %ld\n",
233 -PTR_ERR(ah));
234 /* use original error */
235 return PTR_ERR(ah);
236 } else {
237 spin_lock_irq(&priv->lock);
238 mcast->ah = ah;
239 spin_unlock_irq(&priv->lock);
240
241 ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
242 mcast->mcmember.mgid.raw,
243 mcast->ah->ah,
244 be16_to_cpu(mcast->mcmember.mlid),
245 mcast->mcmember.sl);
246 }
247 }
248
249 /* actually send any queued packets */
250 netif_tx_lock_bh(dev);
251 while (!skb_queue_empty(&mcast->pkt_queue)) {
252 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
253
254 netif_tx_unlock_bh(dev);
255
256 skb->dev = dev;
257 if (dev_queue_xmit(skb))
258 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
259
260 netif_tx_lock_bh(dev);
261 }
262 netif_tx_unlock_bh(dev);
263
264 return 0;
265 }
266
267 static int
268 ipoib_mcast_sendonly_join_complete(int status,
269 struct ib_sa_multicast *multicast)
270 {
271 struct ipoib_mcast *mcast = multicast->context;
272 struct net_device *dev = mcast->dev;
273
274 /*
275 * We have to take the mutex to force mcast_sendonly_join to
276 * return from ib_sa_multicast_join and set mcast->mc to a
277 * valid value. Otherwise we were racing with ourselves in
278 * that we might fail here, but get a valid return from
279 * ib_sa_multicast_join after we had cleared mcast->mc here,
280 * resulting in mis-matched joins and leaves and a deadlock
281 */
282 mutex_lock(&mcast_mutex);
283
284 /* We trap for port events ourselves. */
285 if (status == -ENETRESET)
286 goto out;
287
288 if (!status)
289 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
290
291 if (status) {
292 if (mcast->logcount++ < 20)
293 ipoib_dbg_mcast(netdev_priv(dev), "sendonly multicast "
294 "join failed for %pI6, status %d\n",
295 mcast->mcmember.mgid.raw, status);
296
297 /* Flush out any queued packets */
298 netif_tx_lock_bh(dev);
299 while (!skb_queue_empty(&mcast->pkt_queue)) {
300 ++dev->stats.tx_dropped;
301 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
302 }
303 netif_tx_unlock_bh(dev);
304 }
305 out:
306 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
307 if (status)
308 mcast->mc = NULL;
309 complete(&mcast->done);
310 if (status == -ENETRESET)
311 status = 0;
312 mutex_unlock(&mcast_mutex);
313 return status;
314 }
315
316 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
317 {
318 struct net_device *dev = mcast->dev;
319 struct ipoib_dev_priv *priv = netdev_priv(dev);
320 struct ib_sa_mcmember_rec rec = {
321 #if 0 /* Some SMs don't support send-only yet */
322 .join_state = 4
323 #else
324 .join_state = 1
325 #endif
326 };
327 int ret = 0;
328
329 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
330 ipoib_dbg_mcast(priv, "device shutting down, no sendonly "
331 "multicast joins\n");
332 return -ENODEV;
333 }
334
335 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
336 ipoib_dbg_mcast(priv, "multicast entry busy, skipping "
337 "sendonly join\n");
338 return -EBUSY;
339 }
340
341 rec.mgid = mcast->mcmember.mgid;
342 rec.port_gid = priv->local_gid;
343 rec.pkey = cpu_to_be16(priv->pkey);
344
345 mutex_lock(&mcast_mutex);
346 init_completion(&mcast->done);
347 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
348 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
349 priv->port, &rec,
350 IB_SA_MCMEMBER_REC_MGID |
351 IB_SA_MCMEMBER_REC_PORT_GID |
352 IB_SA_MCMEMBER_REC_PKEY |
353 IB_SA_MCMEMBER_REC_JOIN_STATE,
354 GFP_ATOMIC,
355 ipoib_mcast_sendonly_join_complete,
356 mcast);
357 if (IS_ERR(mcast->mc)) {
358 ret = PTR_ERR(mcast->mc);
359 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
360 complete(&mcast->done);
361 ipoib_warn(priv, "ib_sa_join_multicast for sendonly join "
362 "failed (ret = %d)\n", ret);
363 } else {
364 ipoib_dbg_mcast(priv, "no multicast record for %pI6, starting "
365 "sendonly join\n", mcast->mcmember.mgid.raw);
366 }
367 mutex_unlock(&mcast_mutex);
368
369 return ret;
370 }
371
372 void ipoib_mcast_carrier_on_task(struct work_struct *work)
373 {
374 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
375 carrier_on_task);
376 struct ib_port_attr attr;
377
378 if (ib_query_port(priv->ca, priv->port, &attr) ||
379 attr.state != IB_PORT_ACTIVE) {
380 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
381 return;
382 }
383
384 /*
385 * Take rtnl_lock to avoid racing with ipoib_stop() and
386 * turning the carrier back on while a device is being
387 * removed. However, ipoib_stop() will attempt to flush
388 * the workqueue while holding the rtnl lock, so loop
389 * on trylock until either we get the lock or we see
390 * FLAG_ADMIN_UP go away as that signals that we are bailing
391 * and can safely ignore the carrier on work
392 */
393 while (!rtnl_trylock()) {
394 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
395 return;
396 else
397 msleep(20);
398 }
399 if (!ipoib_cm_admin_enabled(priv->dev))
400 dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
401 netif_carrier_on(priv->dev);
402 rtnl_unlock();
403 }
404
405 static int ipoib_mcast_join_complete(int status,
406 struct ib_sa_multicast *multicast)
407 {
408 struct ipoib_mcast *mcast = multicast->context;
409 struct net_device *dev = mcast->dev;
410 struct ipoib_dev_priv *priv = netdev_priv(dev);
411
412 ipoib_dbg_mcast(priv, "join completion for %pI6 (status %d)\n",
413 mcast->mcmember.mgid.raw, status);
414
415 /*
416 * We have to take the mutex to force mcast_join to
417 * return from ib_sa_multicast_join and set mcast->mc to a
418 * valid value. Otherwise we were racing with ourselves in
419 * that we might fail here, but get a valid return from
420 * ib_sa_multicast_join after we had cleared mcast->mc here,
421 * resulting in mis-matched joins and leaves and a deadlock
422 */
423 mutex_lock(&mcast_mutex);
424
425 /* We trap for port events ourselves. */
426 if (status == -ENETRESET)
427 goto out;
428
429 if (!status)
430 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
431
432 if (!status) {
433 mcast->backoff = 1;
434 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
435 queue_delayed_work(ipoib_workqueue,
436 &priv->mcast_task, 0);
437
438 /*
439 * Defer carrier on work to ipoib_workqueue to avoid a
440 * deadlock on rtnl_lock here.
441 */
442 if (mcast == priv->broadcast)
443 queue_work(ipoib_workqueue, &priv->carrier_on_task);
444 } else {
445 if (mcast->logcount++ < 20) {
446 if (status == -ETIMEDOUT || status == -EAGAIN) {
447 ipoib_dbg_mcast(priv, "multicast join failed for %pI6, status %d\n",
448 mcast->mcmember.mgid.raw, status);
449 } else {
450 ipoib_warn(priv, "multicast join failed for %pI6, status %d\n",
451 mcast->mcmember.mgid.raw, status);
452 }
453 }
454
455 mcast->backoff *= 2;
456 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
457 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
458 }
459 out:
460 spin_lock_irq(&priv->lock);
461 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
462 if (status)
463 mcast->mc = NULL;
464 complete(&mcast->done);
465 if (status == -ENETRESET)
466 status = 0;
467 if (status && test_bit(IPOIB_MCAST_RUN, &priv->flags))
468 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
469 mcast->backoff * HZ);
470 spin_unlock_irq(&priv->lock);
471 mutex_unlock(&mcast_mutex);
472
473 return status;
474 }
475
476 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
477 int create)
478 {
479 struct ipoib_dev_priv *priv = netdev_priv(dev);
480 struct ib_sa_mcmember_rec rec = {
481 .join_state = 1
482 };
483 ib_sa_comp_mask comp_mask;
484 int ret = 0;
485
486 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
487
488 rec.mgid = mcast->mcmember.mgid;
489 rec.port_gid = priv->local_gid;
490 rec.pkey = cpu_to_be16(priv->pkey);
491
492 comp_mask =
493 IB_SA_MCMEMBER_REC_MGID |
494 IB_SA_MCMEMBER_REC_PORT_GID |
495 IB_SA_MCMEMBER_REC_PKEY |
496 IB_SA_MCMEMBER_REC_JOIN_STATE;
497
498 if (create) {
499 comp_mask |=
500 IB_SA_MCMEMBER_REC_QKEY |
501 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
502 IB_SA_MCMEMBER_REC_MTU |
503 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |
504 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
505 IB_SA_MCMEMBER_REC_RATE |
506 IB_SA_MCMEMBER_REC_SL |
507 IB_SA_MCMEMBER_REC_FLOW_LABEL |
508 IB_SA_MCMEMBER_REC_HOP_LIMIT;
509
510 rec.qkey = priv->broadcast->mcmember.qkey;
511 rec.mtu_selector = IB_SA_EQ;
512 rec.mtu = priv->broadcast->mcmember.mtu;
513 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
514 rec.rate_selector = IB_SA_EQ;
515 rec.rate = priv->broadcast->mcmember.rate;
516 rec.sl = priv->broadcast->mcmember.sl;
517 rec.flow_label = priv->broadcast->mcmember.flow_label;
518 rec.hop_limit = priv->broadcast->mcmember.hop_limit;
519 }
520
521 mutex_lock(&mcast_mutex);
522 init_completion(&mcast->done);
523 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
524 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
525 &rec, comp_mask, GFP_KERNEL,
526 ipoib_mcast_join_complete, mcast);
527 if (IS_ERR(mcast->mc)) {
528 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
529 complete(&mcast->done);
530 ret = PTR_ERR(mcast->mc);
531 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
532
533 mcast->backoff *= 2;
534 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
535 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
536
537 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
538 queue_delayed_work(ipoib_workqueue,
539 &priv->mcast_task,
540 mcast->backoff * HZ);
541 }
542 mutex_unlock(&mcast_mutex);
543 }
544
545 void ipoib_mcast_join_task(struct work_struct *work)
546 {
547 struct ipoib_dev_priv *priv =
548 container_of(work, struct ipoib_dev_priv, mcast_task.work);
549 struct net_device *dev = priv->dev;
550 struct ib_port_attr port_attr;
551
552 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
553 return;
554
555 if (ib_query_port(priv->ca, priv->port, &port_attr) ||
556 port_attr.state != IB_PORT_ACTIVE) {
557 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
558 port_attr.state);
559 return;
560 }
561 priv->local_lid = port_attr.lid;
562
563 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
564 ipoib_warn(priv, "ib_query_gid() failed\n");
565 else
566 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
567
568 if (!priv->broadcast) {
569 struct ipoib_mcast *broadcast;
570
571 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
572 return;
573
574 broadcast = ipoib_mcast_alloc(dev, 1);
575 if (!broadcast) {
576 ipoib_warn(priv, "failed to allocate broadcast group\n");
577 mutex_lock(&mcast_mutex);
578 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
579 queue_delayed_work(ipoib_workqueue,
580 &priv->mcast_task, HZ);
581 mutex_unlock(&mcast_mutex);
582 return;
583 }
584
585 spin_lock_irq(&priv->lock);
586 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
587 sizeof (union ib_gid));
588 priv->broadcast = broadcast;
589
590 __ipoib_mcast_add(dev, priv->broadcast);
591 spin_unlock_irq(&priv->lock);
592 }
593
594 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
595 if (IS_ERR_OR_NULL(priv->broadcast->mc) &&
596 !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
597 ipoib_mcast_join(dev, priv->broadcast, 0);
598 return;
599 }
600
601 while (1) {
602 struct ipoib_mcast *mcast = NULL;
603
604 /*
605 * Need the mutex so our flags are consistent, need the
606 * priv->lock so we don't race with list removals in either
607 * mcast_dev_flush or mcast_restart_task
608 */
609 mutex_lock(&mcast_mutex);
610 spin_lock_irq(&priv->lock);
611 list_for_each_entry(mcast, &priv->multicast_list, list) {
612 if (IS_ERR_OR_NULL(mcast->mc) &&
613 !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&
614 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
615 /* Found the next unjoined group */
616 break;
617 }
618 }
619 spin_unlock_irq(&priv->lock);
620 mutex_unlock(&mcast_mutex);
621
622 if (&mcast->list == &priv->multicast_list) {
623 /* All done */
624 break;
625 }
626
627 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
628 ipoib_mcast_sendonly_join(mcast);
629 else
630 ipoib_mcast_join(dev, mcast, 1);
631 return;
632 }
633
634 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
635
636 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
637 }
638
639 int ipoib_mcast_start_thread(struct net_device *dev)
640 {
641 struct ipoib_dev_priv *priv = netdev_priv(dev);
642
643 ipoib_dbg_mcast(priv, "starting multicast thread\n");
644
645 mutex_lock(&mcast_mutex);
646 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
647 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
648 mutex_unlock(&mcast_mutex);
649
650 return 0;
651 }
652
653 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
654 {
655 struct ipoib_dev_priv *priv = netdev_priv(dev);
656
657 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
658
659 mutex_lock(&mcast_mutex);
660 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
661 cancel_delayed_work(&priv->mcast_task);
662 mutex_unlock(&mcast_mutex);
663
664 if (flush)
665 flush_workqueue(ipoib_workqueue);
666
667 return 0;
668 }
669
670 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
671 {
672 struct ipoib_dev_priv *priv = netdev_priv(dev);
673 int ret = 0;
674
675 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
676 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
677
678 if (!IS_ERR_OR_NULL(mcast->mc))
679 ib_sa_free_multicast(mcast->mc);
680
681 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
682 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
683 mcast->mcmember.mgid.raw);
684
685 /* Remove ourselves from the multicast group */
686 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
687 be16_to_cpu(mcast->mcmember.mlid));
688 if (ret)
689 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
690 }
691
692 return 0;
693 }
694
695 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
696 {
697 struct ipoib_dev_priv *priv = netdev_priv(dev);
698 struct ipoib_mcast *mcast;
699 unsigned long flags;
700 void *mgid = daddr + 4;
701
702 spin_lock_irqsave(&priv->lock, flags);
703
704 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) ||
705 !priv->broadcast ||
706 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
707 ++dev->stats.tx_dropped;
708 dev_kfree_skb_any(skb);
709 goto unlock;
710 }
711
712 mcast = __ipoib_mcast_find(dev, mgid);
713 if (!mcast) {
714 /* Let's create a new send only group now */
715 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
716 mgid);
717
718 mcast = ipoib_mcast_alloc(dev, 0);
719 if (!mcast) {
720 ipoib_warn(priv, "unable to allocate memory for "
721 "multicast structure\n");
722 ++dev->stats.tx_dropped;
723 dev_kfree_skb_any(skb);
724 goto out;
725 }
726
727 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
728 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
729 __ipoib_mcast_add(dev, mcast);
730 list_add_tail(&mcast->list, &priv->multicast_list);
731 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
732 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
733 }
734
735 if (!mcast->ah) {
736 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
737 skb_queue_tail(&mcast->pkt_queue, skb);
738 else {
739 ++dev->stats.tx_dropped;
740 dev_kfree_skb_any(skb);
741 }
742
743 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
744 ipoib_dbg_mcast(priv, "no address vector, "
745 "but multicast join already started\n");
746
747 /*
748 * If lookup completes between here and out:, don't
749 * want to send packet twice.
750 */
751 mcast = NULL;
752 }
753
754 out:
755 if (mcast && mcast->ah) {
756 struct ipoib_neigh *neigh;
757
758 spin_unlock_irqrestore(&priv->lock, flags);
759 neigh = ipoib_neigh_get(dev, daddr);
760 spin_lock_irqsave(&priv->lock, flags);
761 if (!neigh) {
762 neigh = ipoib_neigh_alloc(daddr, dev);
763 if (neigh) {
764 kref_get(&mcast->ah->ref);
765 neigh->ah = mcast->ah;
766 list_add_tail(&neigh->list, &mcast->neigh_list);
767 }
768 }
769 spin_unlock_irqrestore(&priv->lock, flags);
770 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
771 if (neigh)
772 ipoib_neigh_put(neigh);
773 return;
774 }
775
776 unlock:
777 spin_unlock_irqrestore(&priv->lock, flags);
778 }
779
780 void ipoib_mcast_dev_flush(struct net_device *dev)
781 {
782 struct ipoib_dev_priv *priv = netdev_priv(dev);
783 LIST_HEAD(remove_list);
784 struct ipoib_mcast *mcast, *tmcast;
785 unsigned long flags;
786
787 ipoib_dbg_mcast(priv, "flushing multicast list\n");
788
789 spin_lock_irqsave(&priv->lock, flags);
790
791 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
792 list_del(&mcast->list);
793 rb_erase(&mcast->rb_node, &priv->multicast_tree);
794 list_add_tail(&mcast->list, &remove_list);
795 }
796
797 if (priv->broadcast) {
798 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
799 list_add_tail(&priv->broadcast->list, &remove_list);
800 priv->broadcast = NULL;
801 }
802
803 spin_unlock_irqrestore(&priv->lock, flags);
804
805 /*
806 * make sure the in-flight joins have finished before we attempt
807 * to leave
808 */
809 list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
810 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
811 wait_for_completion(&mcast->done);
812
813 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
814 ipoib_mcast_leave(dev, mcast);
815 ipoib_mcast_free(mcast);
816 }
817 }
818
819 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
820 {
821 /* reserved QPN, prefix, scope */
822 if (memcmp(addr, broadcast, 6))
823 return 0;
824 /* signature lower, pkey */
825 if (memcmp(addr + 7, broadcast + 7, 3))
826 return 0;
827 return 1;
828 }
829
830 void ipoib_mcast_restart_task(struct work_struct *work)
831 {
832 struct ipoib_dev_priv *priv =
833 container_of(work, struct ipoib_dev_priv, restart_task);
834 struct net_device *dev = priv->dev;
835 struct netdev_hw_addr *ha;
836 struct ipoib_mcast *mcast, *tmcast;
837 LIST_HEAD(remove_list);
838 unsigned long flags;
839 struct ib_sa_mcmember_rec rec;
840
841 ipoib_dbg_mcast(priv, "restarting multicast task\n");
842
843 ipoib_mcast_stop_thread(dev, 0);
844
845 local_irq_save(flags);
846 netif_addr_lock(dev);
847 spin_lock(&priv->lock);
848
849 /*
850 * Unfortunately, the networking core only gives us a list of all of
851 * the multicast hardware addresses. We need to figure out which ones
852 * are new and which ones have been removed
853 */
854
855 /* Clear out the found flag */
856 list_for_each_entry(mcast, &priv->multicast_list, list)
857 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
858
859 /* Mark all of the entries that are found or don't exist */
860 netdev_for_each_mc_addr(ha, dev) {
861 union ib_gid mgid;
862
863 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
864 continue;
865
866 memcpy(mgid.raw, ha->addr + 4, sizeof mgid);
867
868 mcast = __ipoib_mcast_find(dev, &mgid);
869 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
870 struct ipoib_mcast *nmcast;
871
872 /* ignore group which is directly joined by userspace */
873 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
874 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
875 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
876 mgid.raw);
877 continue;
878 }
879
880 /* Not found or send-only group, let's add a new entry */
881 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
882 mgid.raw);
883
884 nmcast = ipoib_mcast_alloc(dev, 0);
885 if (!nmcast) {
886 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
887 continue;
888 }
889
890 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
891
892 nmcast->mcmember.mgid = mgid;
893
894 if (mcast) {
895 /* Destroy the send only entry */
896 list_move_tail(&mcast->list, &remove_list);
897
898 rb_replace_node(&mcast->rb_node,
899 &nmcast->rb_node,
900 &priv->multicast_tree);
901 } else
902 __ipoib_mcast_add(dev, nmcast);
903
904 list_add_tail(&nmcast->list, &priv->multicast_list);
905 }
906
907 if (mcast)
908 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
909 }
910
911 /* Remove all of the entries don't exist anymore */
912 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
913 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
914 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
915 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
916 mcast->mcmember.mgid.raw);
917
918 rb_erase(&mcast->rb_node, &priv->multicast_tree);
919
920 /* Move to the remove list */
921 list_move_tail(&mcast->list, &remove_list);
922 }
923 }
924
925 spin_unlock(&priv->lock);
926 netif_addr_unlock(dev);
927 local_irq_restore(flags);
928
929 /*
930 * make sure the in-flight joins have finished before we attempt
931 * to leave
932 */
933 list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
934 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
935 wait_for_completion(&mcast->done);
936
937 /*
938 * We have to cancel outside of the spinlock, but we have to
939 * take the rtnl lock or else we race with the removal of
940 * entries from the remove list in mcast_dev_flush as part
941 * of ipoib_stop() which will call mcast_stop_thread with
942 * flush == 1 while holding the rtnl lock, and the
943 * flush_workqueue won't complete until this restart_mcast_task
944 * completes. So do like the carrier on task and attempt to
945 * take the rtnl lock, but if we can't before the ADMIN_UP flag
946 * goes away, then just return and know that the remove list will
947 * get flushed later by mcast_dev_flush.
948 */
949 while (!rtnl_trylock()) {
950 if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
951 return;
952 else
953 msleep(20);
954 }
955 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
956 ipoib_mcast_leave(mcast->dev, mcast);
957 ipoib_mcast_free(mcast);
958 }
959 ipoib_mcast_start_thread(dev);
960 rtnl_unlock();
961 }
962
963 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
964
965 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
966 {
967 struct ipoib_mcast_iter *iter;
968
969 iter = kmalloc(sizeof *iter, GFP_KERNEL);
970 if (!iter)
971 return NULL;
972
973 iter->dev = dev;
974 memset(iter->mgid.raw, 0, 16);
975
976 if (ipoib_mcast_iter_next(iter)) {
977 kfree(iter);
978 return NULL;
979 }
980
981 return iter;
982 }
983
984 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
985 {
986 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
987 struct rb_node *n;
988 struct ipoib_mcast *mcast;
989 int ret = 1;
990
991 spin_lock_irq(&priv->lock);
992
993 n = rb_first(&priv->multicast_tree);
994
995 while (n) {
996 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
997
998 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
999 sizeof (union ib_gid)) < 0) {
1000 iter->mgid = mcast->mcmember.mgid;
1001 iter->created = mcast->created;
1002 iter->queuelen = skb_queue_len(&mcast->pkt_queue);
1003 iter->complete = !!mcast->ah;
1004 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
1005
1006 ret = 0;
1007
1008 break;
1009 }
1010
1011 n = rb_next(n);
1012 }
1013
1014 spin_unlock_irq(&priv->lock);
1015
1016 return ret;
1017 }
1018
1019 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
1020 union ib_gid *mgid,
1021 unsigned long *created,
1022 unsigned int *queuelen,
1023 unsigned int *complete,
1024 unsigned int *send_only)
1025 {
1026 *mgid = iter->mgid;
1027 *created = iter->created;
1028 *queuelen = iter->queuelen;
1029 *complete = iter->complete;
1030 *send_only = iter->send_only;
1031 }
1032
1033 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
Linux kernel - Deliverables
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