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3203ebe9b1003a30e80e5dde37351f8795951549
[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 struct ipoib_mcast_iter {
59 struct net_device *dev;
60 union ib_gid mgid;
61 unsigned long created;
62 unsigned int queuelen;
63 unsigned int complete;
64 unsigned int send_only;
65 };
66
67 /*
68 * This should be called with the priv->lock held
69 */
70 static void __ipoib_mcast_schedule_join_thread(struct ipoib_dev_priv *priv,
71 struct ipoib_mcast *mcast,
72 bool delay)
73 {
74 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
75 return;
76
77 /*
78 * We will be scheduling *something*, so cancel whatever is
79 * currently scheduled first
80 */
81 cancel_delayed_work(&priv->mcast_task);
82 if (mcast && delay) {
83 /*
84 * We had a failure and want to schedule a retry later
85 */
86 mcast->backoff *= 2;
87 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
88 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
89 mcast->delay_until = jiffies + (mcast->backoff * HZ);
90 /*
91 * Mark this mcast for its delay, but restart the
92 * task immediately. The join task will make sure to
93 * clear out all entries without delays, and then
94 * schedule itself to run again when the earliest
95 * delay expires
96 */
97 queue_delayed_work(priv->wq, &priv->mcast_task, 0);
98 } else if (delay) {
99 /*
100 * Special case of retrying after a failure to
101 * allocate the broadcast multicast group, wait
102 * 1 second and try again
103 */
104 queue_delayed_work(priv->wq, &priv->mcast_task, HZ);
105 } else
106 queue_delayed_work(priv->wq, &priv->mcast_task, 0);
107 }
108
109 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
110 {
111 struct net_device *dev = mcast->dev;
112 int tx_dropped = 0;
113
114 ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n",
115 mcast->mcmember.mgid.raw);
116
117 /* remove all neigh connected to this mcast */
118 ipoib_del_neighs_by_gid(dev, mcast->mcmember.mgid.raw);
119
120 if (mcast->ah)
121 ipoib_put_ah(mcast->ah);
122
123 while (!skb_queue_empty(&mcast->pkt_queue)) {
124 ++tx_dropped;
125 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
126 }
127
128 netif_tx_lock_bh(dev);
129 dev->stats.tx_dropped += tx_dropped;
130 netif_tx_unlock_bh(dev);
131
132 kfree(mcast);
133 }
134
135 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
136 int can_sleep)
137 {
138 struct ipoib_mcast *mcast;
139
140 mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
141 if (!mcast)
142 return NULL;
143
144 mcast->dev = dev;
145 mcast->created = jiffies;
146 mcast->delay_until = jiffies;
147 mcast->backoff = 1;
148
149 INIT_LIST_HEAD(&mcast->list);
150 INIT_LIST_HEAD(&mcast->neigh_list);
151 skb_queue_head_init(&mcast->pkt_queue);
152
153 return mcast;
154 }
155
156 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
157 {
158 struct ipoib_dev_priv *priv = netdev_priv(dev);
159 struct rb_node *n = priv->multicast_tree.rb_node;
160
161 while (n) {
162 struct ipoib_mcast *mcast;
163 int ret;
164
165 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
166
167 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
168 sizeof (union ib_gid));
169 if (ret < 0)
170 n = n->rb_left;
171 else if (ret > 0)
172 n = n->rb_right;
173 else
174 return mcast;
175 }
176
177 return NULL;
178 }
179
180 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
181 {
182 struct ipoib_dev_priv *priv = netdev_priv(dev);
183 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
184
185 while (*n) {
186 struct ipoib_mcast *tmcast;
187 int ret;
188
189 pn = *n;
190 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
191
192 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
193 sizeof (union ib_gid));
194 if (ret < 0)
195 n = &pn->rb_left;
196 else if (ret > 0)
197 n = &pn->rb_right;
198 else
199 return -EEXIST;
200 }
201
202 rb_link_node(&mcast->rb_node, pn, n);
203 rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
204
205 return 0;
206 }
207
208 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
209 struct ib_sa_mcmember_rec *mcmember)
210 {
211 struct net_device *dev = mcast->dev;
212 struct ipoib_dev_priv *priv = netdev_priv(dev);
213 struct ipoib_ah *ah;
214 int ret;
215 int set_qkey = 0;
216
217 mcast->mcmember = *mcmember;
218
219 /* Set the multicast MTU and cached Q_Key before we attach if it's
220 * the broadcast group.
221 */
222 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
223 sizeof (union ib_gid))) {
224 spin_lock_irq(&priv->lock);
225 if (!priv->broadcast) {
226 spin_unlock_irq(&priv->lock);
227 return -EAGAIN;
228 }
229 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
230 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
231 spin_unlock_irq(&priv->lock);
232 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
233 set_qkey = 1;
234 }
235
236 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
237 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
238 ipoib_warn(priv, "multicast group %pI6 already attached\n",
239 mcast->mcmember.mgid.raw);
240
241 return 0;
242 }
243
244 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
245 &mcast->mcmember.mgid, set_qkey);
246 if (ret < 0) {
247 ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
248 mcast->mcmember.mgid.raw);
249
250 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
251 return ret;
252 }
253 }
254
255 {
256 struct ib_ah_attr av = {
257 .dlid = be16_to_cpu(mcast->mcmember.mlid),
258 .port_num = priv->port,
259 .sl = mcast->mcmember.sl,
260 .ah_flags = IB_AH_GRH,
261 .static_rate = mcast->mcmember.rate,
262 .grh = {
263 .flow_label = be32_to_cpu(mcast->mcmember.flow_label),
264 .hop_limit = mcast->mcmember.hop_limit,
265 .sgid_index = 0,
266 .traffic_class = mcast->mcmember.traffic_class
267 }
268 };
269 av.grh.dgid = mcast->mcmember.mgid;
270
271 ah = ipoib_create_ah(dev, priv->pd, &av);
272 if (IS_ERR(ah)) {
273 ipoib_warn(priv, "ib_address_create failed %ld\n",
274 -PTR_ERR(ah));
275 /* use original error */
276 return PTR_ERR(ah);
277 } else {
278 spin_lock_irq(&priv->lock);
279 mcast->ah = ah;
280 spin_unlock_irq(&priv->lock);
281
282 ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
283 mcast->mcmember.mgid.raw,
284 mcast->ah->ah,
285 be16_to_cpu(mcast->mcmember.mlid),
286 mcast->mcmember.sl);
287 }
288 }
289
290 /* actually send any queued packets */
291 netif_tx_lock_bh(dev);
292 while (!skb_queue_empty(&mcast->pkt_queue)) {
293 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
294
295 netif_tx_unlock_bh(dev);
296
297 skb->dev = dev;
298 if (dev_queue_xmit(skb))
299 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
300
301 netif_tx_lock_bh(dev);
302 }
303 netif_tx_unlock_bh(dev);
304
305 return 0;
306 }
307
308 void ipoib_mcast_carrier_on_task(struct work_struct *work)
309 {
310 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
311 carrier_on_task);
312 struct ib_port_attr attr;
313
314 if (ib_query_port(priv->ca, priv->port, &attr) ||
315 attr.state != IB_PORT_ACTIVE) {
316 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
317 return;
318 }
319
320 /*
321 * Take rtnl_lock to avoid racing with ipoib_stop() and
322 * turning the carrier back on while a device is being
323 * removed. However, ipoib_stop() will attempt to flush
324 * the workqueue while holding the rtnl lock, so loop
325 * on trylock until either we get the lock or we see
326 * FLAG_OPER_UP go away as that signals that we are bailing
327 * and can safely ignore the carrier on work.
328 */
329 while (!rtnl_trylock()) {
330 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
331 return;
332 else
333 msleep(20);
334 }
335 if (!ipoib_cm_admin_enabled(priv->dev))
336 dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
337 netif_carrier_on(priv->dev);
338 rtnl_unlock();
339 }
340
341 static int ipoib_mcast_join_complete(int status,
342 struct ib_sa_multicast *multicast)
343 {
344 struct ipoib_mcast *mcast = multicast->context;
345 struct net_device *dev = mcast->dev;
346 struct ipoib_dev_priv *priv = netdev_priv(dev);
347
348 ipoib_dbg_mcast(priv, "%sjoin completion for %pI6 (status %d)\n",
349 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ?
350 "sendonly " : "",
351 mcast->mcmember.mgid.raw, status);
352
353 /* We trap for port events ourselves. */
354 if (status == -ENETRESET) {
355 status = 0;
356 goto out;
357 }
358
359 if (!status)
360 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
361
362 if (!status) {
363 mcast->backoff = 1;
364 mcast->delay_until = jiffies;
365
366 /*
367 * Defer carrier on work to priv->wq to avoid a
368 * deadlock on rtnl_lock here. Requeue our multicast
369 * work too, which will end up happening right after
370 * our carrier on task work and will allow us to
371 * send out all of the non-broadcast joins
372 */
373 if (mcast == priv->broadcast) {
374 spin_lock_irq(&priv->lock);
375 queue_work(priv->wq, &priv->carrier_on_task);
376 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
377 goto out_locked;
378 }
379 } else {
380 if (mcast->logcount++ < 20) {
381 if (status == -ETIMEDOUT || status == -EAGAIN) {
382 ipoib_dbg_mcast(priv, "%smulticast join failed for %pI6, status %d\n",
383 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
384 mcast->mcmember.mgid.raw, status);
385 } else {
386 ipoib_warn(priv, "%smulticast join failed for %pI6, status %d\n",
387 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
388 mcast->mcmember.mgid.raw, status);
389 }
390 }
391
392 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
393 mcast->backoff >= 2) {
394 /*
395 * We only retry sendonly joins once before we drop
396 * the packet and quit trying to deal with the
397 * group. However, we leave the group in the
398 * mcast list as an unjoined group. If we want to
399 * try joining again, we simply queue up a packet
400 * and restart the join thread. The empty queue
401 * is why the join thread ignores this group.
402 */
403 mcast->backoff = 1;
404 netif_tx_lock_bh(dev);
405 while (!skb_queue_empty(&mcast->pkt_queue)) {
406 ++dev->stats.tx_dropped;
407 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
408 }
409 netif_tx_unlock_bh(dev);
410 } else {
411 spin_lock_irq(&priv->lock);
412 /* Requeue this join task with a backoff delay */
413 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
414 goto out_locked;
415 }
416 }
417 out:
418 spin_lock_irq(&priv->lock);
419 out_locked:
420 /*
421 * Make sure to set mcast->mc before we clear the busy flag to avoid
422 * racing with code that checks for BUSY before checking mcast->mc
423 */
424 if (status)
425 mcast->mc = NULL;
426 else
427 mcast->mc = multicast;
428 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
429 spin_unlock_irq(&priv->lock);
430 complete(&mcast->done);
431
432 return status;
433 }
434
435 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
436 int create)
437 {
438 struct ipoib_dev_priv *priv = netdev_priv(dev);
439 struct ib_sa_multicast *multicast;
440 struct ib_sa_mcmember_rec rec = {
441 .join_state = 1
442 };
443 ib_sa_comp_mask comp_mask;
444 int ret = 0;
445
446 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
447
448 rec.mgid = mcast->mcmember.mgid;
449 rec.port_gid = priv->local_gid;
450 rec.pkey = cpu_to_be16(priv->pkey);
451
452 comp_mask =
453 IB_SA_MCMEMBER_REC_MGID |
454 IB_SA_MCMEMBER_REC_PORT_GID |
455 IB_SA_MCMEMBER_REC_PKEY |
456 IB_SA_MCMEMBER_REC_JOIN_STATE;
457
458 if (create) {
459 comp_mask |=
460 IB_SA_MCMEMBER_REC_QKEY |
461 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
462 IB_SA_MCMEMBER_REC_MTU |
463 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |
464 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
465 IB_SA_MCMEMBER_REC_RATE |
466 IB_SA_MCMEMBER_REC_SL |
467 IB_SA_MCMEMBER_REC_FLOW_LABEL |
468 IB_SA_MCMEMBER_REC_HOP_LIMIT;
469
470 rec.qkey = priv->broadcast->mcmember.qkey;
471 rec.mtu_selector = IB_SA_EQ;
472 rec.mtu = priv->broadcast->mcmember.mtu;
473 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
474 rec.rate_selector = IB_SA_EQ;
475 rec.rate = priv->broadcast->mcmember.rate;
476 rec.sl = priv->broadcast->mcmember.sl;
477 rec.flow_label = priv->broadcast->mcmember.flow_label;
478 rec.hop_limit = priv->broadcast->mcmember.hop_limit;
479 }
480
481 multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
482 &rec, comp_mask, GFP_KERNEL,
483 ipoib_mcast_join_complete, mcast);
484 if (IS_ERR(multicast)) {
485 ret = PTR_ERR(multicast);
486 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
487 spin_lock_irq(&priv->lock);
488 /* Requeue this join task with a backoff delay */
489 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
490 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
491 spin_unlock_irq(&priv->lock);
492 complete(&mcast->done);
493 }
494 }
495
496 void ipoib_mcast_join_task(struct work_struct *work)
497 {
498 struct ipoib_dev_priv *priv =
499 container_of(work, struct ipoib_dev_priv, mcast_task.work);
500 struct net_device *dev = priv->dev;
501 struct ib_port_attr port_attr;
502 unsigned long delay_until = 0;
503 struct ipoib_mcast *mcast = NULL;
504 int create = 1;
505
506 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
507 return;
508
509 if (ib_query_port(priv->ca, priv->port, &port_attr) ||
510 port_attr.state != IB_PORT_ACTIVE) {
511 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
512 port_attr.state);
513 return;
514 }
515 priv->local_lid = port_attr.lid;
516
517 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
518 ipoib_warn(priv, "ib_query_gid() failed\n");
519 else
520 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
521
522 spin_lock_irq(&priv->lock);
523 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
524 goto out;
525
526 if (!priv->broadcast) {
527 struct ipoib_mcast *broadcast;
528
529 broadcast = ipoib_mcast_alloc(dev, 0);
530 if (!broadcast) {
531 ipoib_warn(priv, "failed to allocate broadcast group\n");
532 /*
533 * Restart us after a 1 second delay to retry
534 * creating our broadcast group and attaching to
535 * it. Until this succeeds, this ipoib dev is
536 * completely stalled (multicast wise).
537 */
538 __ipoib_mcast_schedule_join_thread(priv, NULL, 1);
539 goto out;
540 }
541
542 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
543 sizeof (union ib_gid));
544 priv->broadcast = broadcast;
545
546 __ipoib_mcast_add(dev, priv->broadcast);
547 }
548
549 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
550 if (IS_ERR_OR_NULL(priv->broadcast->mc) &&
551 !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) {
552 mcast = priv->broadcast;
553 create = 0;
554 if (mcast->backoff > 1 &&
555 time_before(jiffies, mcast->delay_until)) {
556 delay_until = mcast->delay_until;
557 mcast = NULL;
558 }
559 }
560 goto out;
561 }
562
563 /*
564 * We'll never get here until the broadcast group is both allocated
565 * and attached
566 */
567 list_for_each_entry(mcast, &priv->multicast_list, list) {
568 if (IS_ERR_OR_NULL(mcast->mc) &&
569 !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&
570 (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ||
571 !skb_queue_empty(&mcast->pkt_queue))) {
572 if (mcast->backoff == 1 ||
573 time_after_eq(jiffies, mcast->delay_until)) {
574 /* Found the next unjoined group */
575 init_completion(&mcast->done);
576 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
577 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
578 create = 0;
579 else
580 create = 1;
581 spin_unlock_irq(&priv->lock);
582 ipoib_mcast_join(dev, mcast, create);
583 spin_lock_irq(&priv->lock);
584 } else if (!delay_until ||
585 time_before(mcast->delay_until, delay_until))
586 delay_until = mcast->delay_until;
587 }
588 }
589
590 mcast = NULL;
591 ipoib_dbg_mcast(priv, "successfully started all multicast joins\n");
592
593 out:
594 if (delay_until) {
595 cancel_delayed_work(&priv->mcast_task);
596 queue_delayed_work(priv->wq, &priv->mcast_task,
597 delay_until - jiffies);
598 }
599 if (mcast) {
600 init_completion(&mcast->done);
601 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
602 }
603 spin_unlock_irq(&priv->lock);
604 if (mcast)
605 ipoib_mcast_join(dev, mcast, create);
606 }
607
608 int ipoib_mcast_start_thread(struct net_device *dev)
609 {
610 struct ipoib_dev_priv *priv = netdev_priv(dev);
611 unsigned long flags;
612
613 ipoib_dbg_mcast(priv, "starting multicast thread\n");
614
615 spin_lock_irqsave(&priv->lock, flags);
616 set_bit(IPOIB_MCAST_RUN, &priv->flags);
617 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
618 spin_unlock_irqrestore(&priv->lock, flags);
619
620 return 0;
621 }
622
623 int ipoib_mcast_stop_thread(struct net_device *dev)
624 {
625 struct ipoib_dev_priv *priv = netdev_priv(dev);
626 unsigned long flags;
627
628 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
629
630 spin_lock_irqsave(&priv->lock, flags);
631 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
632 cancel_delayed_work(&priv->mcast_task);
633 spin_unlock_irqrestore(&priv->lock, flags);
634
635 flush_workqueue(priv->wq);
636
637 return 0;
638 }
639
640 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
641 {
642 struct ipoib_dev_priv *priv = netdev_priv(dev);
643 int ret = 0;
644
645 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
646 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
647
648 if (!IS_ERR_OR_NULL(mcast->mc))
649 ib_sa_free_multicast(mcast->mc);
650
651 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
652 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
653 mcast->mcmember.mgid.raw);
654
655 /* Remove ourselves from the multicast group */
656 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
657 be16_to_cpu(mcast->mcmember.mlid));
658 if (ret)
659 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
660 } else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
661 ipoib_dbg(priv, "leaving with no mcmember but not a "
662 "SENDONLY join\n");
663
664 return 0;
665 }
666
667 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
668 {
669 struct ipoib_dev_priv *priv = netdev_priv(dev);
670 struct ipoib_mcast *mcast;
671 unsigned long flags;
672 void *mgid = daddr + 4;
673
674 spin_lock_irqsave(&priv->lock, flags);
675
676 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) ||
677 !priv->broadcast ||
678 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
679 ++dev->stats.tx_dropped;
680 dev_kfree_skb_any(skb);
681 goto unlock;
682 }
683
684 mcast = __ipoib_mcast_find(dev, mgid);
685 if (!mcast || !mcast->ah) {
686 if (!mcast) {
687 /* Let's create a new send only group now */
688 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
689 mgid);
690
691 mcast = ipoib_mcast_alloc(dev, 0);
692 if (!mcast) {
693 ipoib_warn(priv, "unable to allocate memory "
694 "for multicast structure\n");
695 ++dev->stats.tx_dropped;
696 dev_kfree_skb_any(skb);
697 goto unlock;
698 }
699
700 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
701 memcpy(mcast->mcmember.mgid.raw, mgid,
702 sizeof (union ib_gid));
703 __ipoib_mcast_add(dev, mcast);
704 list_add_tail(&mcast->list, &priv->multicast_list);
705 }
706 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
707 skb_queue_tail(&mcast->pkt_queue, skb);
708 else {
709 ++dev->stats.tx_dropped;
710 dev_kfree_skb_any(skb);
711 }
712 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
713 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
714 }
715 } else {
716 struct ipoib_neigh *neigh;
717
718 spin_unlock_irqrestore(&priv->lock, flags);
719 neigh = ipoib_neigh_get(dev, daddr);
720 spin_lock_irqsave(&priv->lock, flags);
721 if (!neigh) {
722 neigh = ipoib_neigh_alloc(daddr, dev);
723 if (neigh) {
724 kref_get(&mcast->ah->ref);
725 neigh->ah = mcast->ah;
726 list_add_tail(&neigh->list, &mcast->neigh_list);
727 }
728 }
729 spin_unlock_irqrestore(&priv->lock, flags);
730 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
731 if (neigh)
732 ipoib_neigh_put(neigh);
733 return;
734 }
735
736 unlock:
737 spin_unlock_irqrestore(&priv->lock, flags);
738 }
739
740 void ipoib_mcast_dev_flush(struct net_device *dev)
741 {
742 struct ipoib_dev_priv *priv = netdev_priv(dev);
743 LIST_HEAD(remove_list);
744 struct ipoib_mcast *mcast, *tmcast;
745 unsigned long flags;
746
747 ipoib_dbg_mcast(priv, "flushing multicast list\n");
748
749 spin_lock_irqsave(&priv->lock, flags);
750
751 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
752 list_del(&mcast->list);
753 rb_erase(&mcast->rb_node, &priv->multicast_tree);
754 list_add_tail(&mcast->list, &remove_list);
755 }
756
757 if (priv->broadcast) {
758 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
759 list_add_tail(&priv->broadcast->list, &remove_list);
760 priv->broadcast = NULL;
761 }
762
763 spin_unlock_irqrestore(&priv->lock, flags);
764
765 /*
766 * make sure the in-flight joins have finished before we attempt
767 * to leave
768 */
769 list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
770 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
771 wait_for_completion(&mcast->done);
772
773 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
774 ipoib_mcast_leave(dev, mcast);
775 ipoib_mcast_free(mcast);
776 }
777 }
778
779 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
780 {
781 /* reserved QPN, prefix, scope */
782 if (memcmp(addr, broadcast, 6))
783 return 0;
784 /* signature lower, pkey */
785 if (memcmp(addr + 7, broadcast + 7, 3))
786 return 0;
787 return 1;
788 }
789
790 void ipoib_mcast_restart_task(struct work_struct *work)
791 {
792 struct ipoib_dev_priv *priv =
793 container_of(work, struct ipoib_dev_priv, restart_task);
794 struct net_device *dev = priv->dev;
795 struct netdev_hw_addr *ha;
796 struct ipoib_mcast *mcast, *tmcast;
797 LIST_HEAD(remove_list);
798 unsigned long flags;
799 struct ib_sa_mcmember_rec rec;
800
801 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
802 /*
803 * shortcut...on shutdown flush is called next, just
804 * let it do all the work
805 */
806 return;
807
808 ipoib_dbg_mcast(priv, "restarting multicast task\n");
809
810 local_irq_save(flags);
811 netif_addr_lock(dev);
812 spin_lock(&priv->lock);
813
814 /*
815 * Unfortunately, the networking core only gives us a list of all of
816 * the multicast hardware addresses. We need to figure out which ones
817 * are new and which ones have been removed
818 */
819
820 /* Clear out the found flag */
821 list_for_each_entry(mcast, &priv->multicast_list, list)
822 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
823
824 /* Mark all of the entries that are found or don't exist */
825 netdev_for_each_mc_addr(ha, dev) {
826 union ib_gid mgid;
827
828 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
829 continue;
830
831 memcpy(mgid.raw, ha->addr + 4, sizeof mgid);
832
833 mcast = __ipoib_mcast_find(dev, &mgid);
834 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
835 struct ipoib_mcast *nmcast;
836
837 /* ignore group which is directly joined by userspace */
838 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
839 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
840 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
841 mgid.raw);
842 continue;
843 }
844
845 /* Not found or send-only group, let's add a new entry */
846 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
847 mgid.raw);
848
849 nmcast = ipoib_mcast_alloc(dev, 0);
850 if (!nmcast) {
851 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
852 continue;
853 }
854
855 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
856
857 nmcast->mcmember.mgid = mgid;
858
859 if (mcast) {
860 /* Destroy the send only entry */
861 list_move_tail(&mcast->list, &remove_list);
862
863 rb_replace_node(&mcast->rb_node,
864 &nmcast->rb_node,
865 &priv->multicast_tree);
866 } else
867 __ipoib_mcast_add(dev, nmcast);
868
869 list_add_tail(&nmcast->list, &priv->multicast_list);
870 }
871
872 if (mcast)
873 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
874 }
875
876 /* Remove all of the entries don't exist anymore */
877 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
878 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
879 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
880 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
881 mcast->mcmember.mgid.raw);
882
883 rb_erase(&mcast->rb_node, &priv->multicast_tree);
884
885 /* Move to the remove list */
886 list_move_tail(&mcast->list, &remove_list);
887 }
888 }
889
890 spin_unlock(&priv->lock);
891 netif_addr_unlock(dev);
892 local_irq_restore(flags);
893
894 /*
895 * make sure the in-flight joins have finished before we attempt
896 * to leave
897 */
898 list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
899 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
900 wait_for_completion(&mcast->done);
901
902 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
903 ipoib_mcast_leave(mcast->dev, mcast);
904 ipoib_mcast_free(mcast);
905 }
906
907 /*
908 * Double check that we are still up
909 */
910 if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
911 spin_lock_irqsave(&priv->lock, flags);
912 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
913 spin_unlock_irqrestore(&priv->lock, flags);
914 }
915 }
916
917 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
918
919 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
920 {
921 struct ipoib_mcast_iter *iter;
922
923 iter = kmalloc(sizeof *iter, GFP_KERNEL);
924 if (!iter)
925 return NULL;
926
927 iter->dev = dev;
928 memset(iter->mgid.raw, 0, 16);
929
930 if (ipoib_mcast_iter_next(iter)) {
931 kfree(iter);
932 return NULL;
933 }
934
935 return iter;
936 }
937
938 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
939 {
940 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
941 struct rb_node *n;
942 struct ipoib_mcast *mcast;
943 int ret = 1;
944
945 spin_lock_irq(&priv->lock);
946
947 n = rb_first(&priv->multicast_tree);
948
949 while (n) {
950 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
951
952 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
953 sizeof (union ib_gid)) < 0) {
954 iter->mgid = mcast->mcmember.mgid;
955 iter->created = mcast->created;
956 iter->queuelen = skb_queue_len(&mcast->pkt_queue);
957 iter->complete = !!mcast->ah;
958 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
959
960 ret = 0;
961
962 break;
963 }
964
965 n = rb_next(n);
966 }
967
968 spin_unlock_irq(&priv->lock);
969
970 return ret;
971 }
972
973 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
974 union ib_gid *mgid,
975 unsigned long *created,
976 unsigned int *queuelen,
977 unsigned int *complete,
978 unsigned int *send_only)
979 {
980 *mgid = iter->mgid;
981 *created = iter->created;
982 *queuelen = iter->queuelen;
983 *complete = iter->complete;
984 *send_only = iter->send_only;
985 }
986
987 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
Linux kernel - Deliverables
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