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IB/ipoib: Expire sendonly multicast joins
[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_FLAG_OPER_UP, &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 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 /*update priv member according to the new mcast*/
230 priv->broadcast->mcmember.qkey = mcmember->qkey;
231 priv->broadcast->mcmember.mtu = mcmember->mtu;
232 priv->broadcast->mcmember.traffic_class = mcmember->traffic_class;
233 priv->broadcast->mcmember.rate = mcmember->rate;
234 priv->broadcast->mcmember.sl = mcmember->sl;
235 priv->broadcast->mcmember.flow_label = mcmember->flow_label;
236 priv->broadcast->mcmember.hop_limit = mcmember->hop_limit;
237 /* assume if the admin and the mcast are the same both can be changed */
238 if (priv->mcast_mtu == priv->admin_mtu)
239 priv->admin_mtu =
240 priv->mcast_mtu =
241 IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
242 else
243 priv->mcast_mtu =
244 IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
245
246 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
247 spin_unlock_irq(&priv->lock);
248 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
249 set_qkey = 1;
250 }
251
252 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
253 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
254 ipoib_warn(priv, "multicast group %pI6 already attached\n",
255 mcast->mcmember.mgid.raw);
256
257 return 0;
258 }
259
260 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
261 &mcast->mcmember.mgid, set_qkey);
262 if (ret < 0) {
263 ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
264 mcast->mcmember.mgid.raw);
265
266 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
267 return ret;
268 }
269 }
270
271 {
272 struct ib_ah_attr av = {
273 .dlid = be16_to_cpu(mcast->mcmember.mlid),
274 .port_num = priv->port,
275 .sl = mcast->mcmember.sl,
276 .ah_flags = IB_AH_GRH,
277 .static_rate = mcast->mcmember.rate,
278 .grh = {
279 .flow_label = be32_to_cpu(mcast->mcmember.flow_label),
280 .hop_limit = mcast->mcmember.hop_limit,
281 .sgid_index = 0,
282 .traffic_class = mcast->mcmember.traffic_class
283 }
284 };
285 av.grh.dgid = mcast->mcmember.mgid;
286
287 ah = ipoib_create_ah(dev, priv->pd, &av);
288 if (IS_ERR(ah)) {
289 ipoib_warn(priv, "ib_address_create failed %ld\n",
290 -PTR_ERR(ah));
291 /* use original error */
292 return PTR_ERR(ah);
293 } else {
294 spin_lock_irq(&priv->lock);
295 mcast->ah = ah;
296 spin_unlock_irq(&priv->lock);
297
298 ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
299 mcast->mcmember.mgid.raw,
300 mcast->ah->ah,
301 be16_to_cpu(mcast->mcmember.mlid),
302 mcast->mcmember.sl);
303 }
304 }
305
306 /* actually send any queued packets */
307 netif_tx_lock_bh(dev);
308 while (!skb_queue_empty(&mcast->pkt_queue)) {
309 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
310
311 netif_tx_unlock_bh(dev);
312
313 skb->dev = dev;
314 if (dev_queue_xmit(skb))
315 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
316
317 netif_tx_lock_bh(dev);
318 }
319 netif_tx_unlock_bh(dev);
320
321 return 0;
322 }
323
324 void ipoib_mcast_carrier_on_task(struct work_struct *work)
325 {
326 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
327 carrier_on_task);
328 struct ib_port_attr attr;
329
330 if (ib_query_port(priv->ca, priv->port, &attr) ||
331 attr.state != IB_PORT_ACTIVE) {
332 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
333 return;
334 }
335
336 /*
337 * Take rtnl_lock to avoid racing with ipoib_stop() and
338 * turning the carrier back on while a device is being
339 * removed. However, ipoib_stop() will attempt to flush
340 * the workqueue while holding the rtnl lock, so loop
341 * on trylock until either we get the lock or we see
342 * FLAG_OPER_UP go away as that signals that we are bailing
343 * and can safely ignore the carrier on work.
344 */
345 while (!rtnl_trylock()) {
346 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
347 return;
348 else
349 msleep(20);
350 }
351 if (!ipoib_cm_admin_enabled(priv->dev))
352 dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
353 netif_carrier_on(priv->dev);
354 rtnl_unlock();
355 }
356
357 static int ipoib_mcast_join_complete(int status,
358 struct ib_sa_multicast *multicast)
359 {
360 struct ipoib_mcast *mcast = multicast->context;
361 struct net_device *dev = mcast->dev;
362 struct ipoib_dev_priv *priv = netdev_priv(dev);
363
364 ipoib_dbg_mcast(priv, "%sjoin completion for %pI6 (status %d)\n",
365 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ?
366 "sendonly " : "",
367 mcast->mcmember.mgid.raw, status);
368
369 /* We trap for port events ourselves. */
370 if (status == -ENETRESET) {
371 status = 0;
372 goto out;
373 }
374
375 if (!status)
376 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
377
378 if (!status) {
379 mcast->backoff = 1;
380 mcast->delay_until = jiffies;
381
382 /*
383 * Defer carrier on work to priv->wq to avoid a
384 * deadlock on rtnl_lock here. Requeue our multicast
385 * work too, which will end up happening right after
386 * our carrier on task work and will allow us to
387 * send out all of the non-broadcast joins
388 */
389 if (mcast == priv->broadcast) {
390 spin_lock_irq(&priv->lock);
391 queue_work(priv->wq, &priv->carrier_on_task);
392 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
393 goto out_locked;
394 }
395 } else {
396 bool silent_fail =
397 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
398 status == -EINVAL;
399
400 if (mcast->logcount < 20) {
401 if (status == -ETIMEDOUT || status == -EAGAIN ||
402 silent_fail) {
403 ipoib_dbg_mcast(priv, "%smulticast join failed for %pI6, status %d\n",
404 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
405 mcast->mcmember.mgid.raw, status);
406 } else {
407 ipoib_warn(priv, "%smulticast join failed for %pI6, status %d\n",
408 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
409 mcast->mcmember.mgid.raw, status);
410 }
411
412 if (!silent_fail)
413 mcast->logcount++;
414 }
415
416 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
417 mcast->backoff >= 2) {
418 /*
419 * We only retry sendonly joins once before we drop
420 * the packet and quit trying to deal with the
421 * group. However, we leave the group in the
422 * mcast list as an unjoined group. If we want to
423 * try joining again, we simply queue up a packet
424 * and restart the join thread. The empty queue
425 * is why the join thread ignores this group.
426 */
427 mcast->backoff = 1;
428 netif_tx_lock_bh(dev);
429 while (!skb_queue_empty(&mcast->pkt_queue)) {
430 ++dev->stats.tx_dropped;
431 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
432 }
433 netif_tx_unlock_bh(dev);
434 } else {
435 spin_lock_irq(&priv->lock);
436 /* Requeue this join task with a backoff delay */
437 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
438 goto out_locked;
439 }
440 }
441 out:
442 spin_lock_irq(&priv->lock);
443 out_locked:
444 /*
445 * Make sure to set mcast->mc before we clear the busy flag to avoid
446 * racing with code that checks for BUSY before checking mcast->mc
447 */
448 if (status)
449 mcast->mc = NULL;
450 else
451 mcast->mc = multicast;
452 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
453 spin_unlock_irq(&priv->lock);
454 complete(&mcast->done);
455
456 return status;
457 }
458
459 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast)
460 {
461 struct ipoib_dev_priv *priv = netdev_priv(dev);
462 struct ib_sa_multicast *multicast;
463 struct ib_sa_mcmember_rec rec = {
464 .join_state = 1
465 };
466 ib_sa_comp_mask comp_mask;
467 int ret = 0;
468
469 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
470
471 rec.mgid = mcast->mcmember.mgid;
472 rec.port_gid = priv->local_gid;
473 rec.pkey = cpu_to_be16(priv->pkey);
474
475 comp_mask =
476 IB_SA_MCMEMBER_REC_MGID |
477 IB_SA_MCMEMBER_REC_PORT_GID |
478 IB_SA_MCMEMBER_REC_PKEY |
479 IB_SA_MCMEMBER_REC_JOIN_STATE;
480
481 if (mcast != priv->broadcast) {
482 /*
483 * RFC 4391:
484 * The MGID MUST use the same P_Key, Q_Key, SL, MTU,
485 * and HopLimit as those used in the broadcast-GID. The rest
486 * of attributes SHOULD follow the values used in the
487 * broadcast-GID as well.
488 */
489 comp_mask |=
490 IB_SA_MCMEMBER_REC_QKEY |
491 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
492 IB_SA_MCMEMBER_REC_MTU |
493 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |
494 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
495 IB_SA_MCMEMBER_REC_RATE |
496 IB_SA_MCMEMBER_REC_SL |
497 IB_SA_MCMEMBER_REC_FLOW_LABEL |
498 IB_SA_MCMEMBER_REC_HOP_LIMIT;
499
500 rec.qkey = priv->broadcast->mcmember.qkey;
501 rec.mtu_selector = IB_SA_EQ;
502 rec.mtu = priv->broadcast->mcmember.mtu;
503 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
504 rec.rate_selector = IB_SA_EQ;
505 rec.rate = priv->broadcast->mcmember.rate;
506 rec.sl = priv->broadcast->mcmember.sl;
507 rec.flow_label = priv->broadcast->mcmember.flow_label;
508 rec.hop_limit = priv->broadcast->mcmember.hop_limit;
509
510 /*
511 * Historically Linux IPoIB has never properly supported SEND
512 * ONLY join. It emulated it by not providing all the required
513 * attributes, which is enough to prevent group creation and
514 * detect if there are full members or not. A major problem
515 * with supporting SEND ONLY is detecting when the group is
516 * auto-destroyed as IPoIB will cache the MLID..
517 */
518 #if 1
519 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
520 comp_mask &= ~IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
521 #else
522 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
523 rec.join_state = 4;
524 #endif
525 }
526
527 multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
528 &rec, comp_mask, GFP_KERNEL,
529 ipoib_mcast_join_complete, mcast);
530 if (IS_ERR(multicast)) {
531 ret = PTR_ERR(multicast);
532 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
533 spin_lock_irq(&priv->lock);
534 /* Requeue this join task with a backoff delay */
535 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
536 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
537 spin_unlock_irq(&priv->lock);
538 complete(&mcast->done);
539 }
540 }
541
542 void ipoib_mcast_join_task(struct work_struct *work)
543 {
544 struct ipoib_dev_priv *priv =
545 container_of(work, struct ipoib_dev_priv, mcast_task.work);
546 struct net_device *dev = priv->dev;
547 struct ib_port_attr port_attr;
548 unsigned long delay_until = 0;
549 struct ipoib_mcast *mcast = NULL;
550
551 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
552 return;
553
554 if (ib_query_port(priv->ca, priv->port, &port_attr) ||
555 port_attr.state != IB_PORT_ACTIVE) {
556 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
557 port_attr.state);
558 return;
559 }
560 priv->local_lid = port_attr.lid;
561
562 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
563 ipoib_warn(priv, "ib_query_gid() failed\n");
564 else
565 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
566
567 spin_lock_irq(&priv->lock);
568 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
569 goto out;
570
571 if (!priv->broadcast) {
572 struct ipoib_mcast *broadcast;
573
574 broadcast = ipoib_mcast_alloc(dev, 0);
575 if (!broadcast) {
576 ipoib_warn(priv, "failed to allocate broadcast group\n");
577 /*
578 * Restart us after a 1 second delay to retry
579 * creating our broadcast group and attaching to
580 * it. Until this succeeds, this ipoib dev is
581 * completely stalled (multicast wise).
582 */
583 __ipoib_mcast_schedule_join_thread(priv, NULL, 1);
584 goto out;
585 }
586
587 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
588 sizeof (union ib_gid));
589 priv->broadcast = broadcast;
590
591 __ipoib_mcast_add(dev, priv->broadcast);
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 mcast = priv->broadcast;
598 if (mcast->backoff > 1 &&
599 time_before(jiffies, mcast->delay_until)) {
600 delay_until = mcast->delay_until;
601 mcast = NULL;
602 }
603 }
604 goto out;
605 }
606
607 /*
608 * We'll never get here until the broadcast group is both allocated
609 * and attached
610 */
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_SENDONLY, &mcast->flags) ||
615 !skb_queue_empty(&mcast->pkt_queue))) {
616 if (mcast->backoff == 1 ||
617 time_after_eq(jiffies, mcast->delay_until)) {
618 /* Found the next unjoined group */
619 init_completion(&mcast->done);
620 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
621 spin_unlock_irq(&priv->lock);
622 ipoib_mcast_join(dev, mcast);
623 spin_lock_irq(&priv->lock);
624 } else if (!delay_until ||
625 time_before(mcast->delay_until, delay_until))
626 delay_until = mcast->delay_until;
627 }
628 }
629
630 mcast = NULL;
631 ipoib_dbg_mcast(priv, "successfully started all multicast joins\n");
632
633 out:
634 if (delay_until) {
635 cancel_delayed_work(&priv->mcast_task);
636 queue_delayed_work(priv->wq, &priv->mcast_task,
637 delay_until - jiffies);
638 }
639 if (mcast) {
640 init_completion(&mcast->done);
641 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
642 }
643 spin_unlock_irq(&priv->lock);
644 if (mcast)
645 ipoib_mcast_join(dev, mcast);
646 }
647
648 int ipoib_mcast_start_thread(struct net_device *dev)
649 {
650 struct ipoib_dev_priv *priv = netdev_priv(dev);
651 unsigned long flags;
652
653 ipoib_dbg_mcast(priv, "starting multicast thread\n");
654
655 spin_lock_irqsave(&priv->lock, flags);
656 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
657 spin_unlock_irqrestore(&priv->lock, flags);
658
659 return 0;
660 }
661
662 int ipoib_mcast_stop_thread(struct net_device *dev)
663 {
664 struct ipoib_dev_priv *priv = netdev_priv(dev);
665 unsigned long flags;
666
667 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
668
669 spin_lock_irqsave(&priv->lock, flags);
670 cancel_delayed_work(&priv->mcast_task);
671 spin_unlock_irqrestore(&priv->lock, flags);
672
673 flush_workqueue(priv->wq);
674
675 return 0;
676 }
677
678 int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
679 {
680 struct ipoib_dev_priv *priv = netdev_priv(dev);
681 int ret = 0;
682
683 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
684 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
685
686 if (!IS_ERR_OR_NULL(mcast->mc))
687 ib_sa_free_multicast(mcast->mc);
688
689 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
690 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
691 mcast->mcmember.mgid.raw);
692
693 /* Remove ourselves from the multicast group */
694 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
695 be16_to_cpu(mcast->mcmember.mlid));
696 if (ret)
697 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
698 } else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
699 ipoib_dbg(priv, "leaving with no mcmember but not a "
700 "SENDONLY join\n");
701
702 return 0;
703 }
704
705 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
706 {
707 struct ipoib_dev_priv *priv = netdev_priv(dev);
708 struct ipoib_mcast *mcast;
709 unsigned long flags;
710 void *mgid = daddr + 4;
711
712 spin_lock_irqsave(&priv->lock, flags);
713
714 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) ||
715 !priv->broadcast ||
716 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
717 ++dev->stats.tx_dropped;
718 dev_kfree_skb_any(skb);
719 goto unlock;
720 }
721
722 mcast = __ipoib_mcast_find(dev, mgid);
723 if (!mcast || !mcast->ah) {
724 if (!mcast) {
725 /* Let's create a new send only group now */
726 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
727 mgid);
728
729 mcast = ipoib_mcast_alloc(dev, 0);
730 if (!mcast) {
731 ipoib_warn(priv, "unable to allocate memory "
732 "for multicast structure\n");
733 ++dev->stats.tx_dropped;
734 dev_kfree_skb_any(skb);
735 goto unlock;
736 }
737
738 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
739 memcpy(mcast->mcmember.mgid.raw, mgid,
740 sizeof (union ib_gid));
741 __ipoib_mcast_add(dev, mcast);
742 list_add_tail(&mcast->list, &priv->multicast_list);
743 }
744 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
745 skb_queue_tail(&mcast->pkt_queue, skb);
746 else {
747 ++dev->stats.tx_dropped;
748 dev_kfree_skb_any(skb);
749 }
750 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
751 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
752 }
753 } else {
754 struct ipoib_neigh *neigh;
755
756 spin_unlock_irqrestore(&priv->lock, flags);
757 neigh = ipoib_neigh_get(dev, daddr);
758 spin_lock_irqsave(&priv->lock, flags);
759 if (!neigh) {
760 neigh = ipoib_neigh_alloc(daddr, dev);
761 if (neigh) {
762 kref_get(&mcast->ah->ref);
763 neigh->ah = mcast->ah;
764 list_add_tail(&neigh->list, &mcast->neigh_list);
765 }
766 }
767 spin_unlock_irqrestore(&priv->lock, flags);
768 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
769 if (neigh)
770 ipoib_neigh_put(neigh);
771 return;
772 }
773
774 unlock:
775 spin_unlock_irqrestore(&priv->lock, flags);
776 }
777
778 void ipoib_mcast_dev_flush(struct net_device *dev)
779 {
780 struct ipoib_dev_priv *priv = netdev_priv(dev);
781 LIST_HEAD(remove_list);
782 struct ipoib_mcast *mcast, *tmcast;
783 unsigned long flags;
784
785 ipoib_dbg_mcast(priv, "flushing multicast list\n");
786
787 spin_lock_irqsave(&priv->lock, flags);
788
789 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
790 list_del(&mcast->list);
791 rb_erase(&mcast->rb_node, &priv->multicast_tree);
792 list_add_tail(&mcast->list, &remove_list);
793 }
794
795 if (priv->broadcast) {
796 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
797 list_add_tail(&priv->broadcast->list, &remove_list);
798 priv->broadcast = NULL;
799 }
800
801 spin_unlock_irqrestore(&priv->lock, flags);
802
803 /*
804 * make sure the in-flight joins have finished before we attempt
805 * to leave
806 */
807 list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
808 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
809 wait_for_completion(&mcast->done);
810
811 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
812 ipoib_mcast_leave(dev, mcast);
813 ipoib_mcast_free(mcast);
814 }
815 }
816
817 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
818 {
819 /* reserved QPN, prefix, scope */
820 if (memcmp(addr, broadcast, 6))
821 return 0;
822 /* signature lower, pkey */
823 if (memcmp(addr + 7, broadcast + 7, 3))
824 return 0;
825 return 1;
826 }
827
828 void ipoib_mcast_restart_task(struct work_struct *work)
829 {
830 struct ipoib_dev_priv *priv =
831 container_of(work, struct ipoib_dev_priv, restart_task);
832 struct net_device *dev = priv->dev;
833 struct netdev_hw_addr *ha;
834 struct ipoib_mcast *mcast, *tmcast;
835 LIST_HEAD(remove_list);
836 unsigned long flags;
837 struct ib_sa_mcmember_rec rec;
838
839 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
840 /*
841 * shortcut...on shutdown flush is called next, just
842 * let it do all the work
843 */
844 return;
845
846 ipoib_dbg_mcast(priv, "restarting multicast task\n");
847
848 local_irq_save(flags);
849 netif_addr_lock(dev);
850 spin_lock(&priv->lock);
851
852 /*
853 * Unfortunately, the networking core only gives us a list of all of
854 * the multicast hardware addresses. We need to figure out which ones
855 * are new and which ones have been removed
856 */
857
858 /* Clear out the found flag */
859 list_for_each_entry(mcast, &priv->multicast_list, list)
860 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
861
862 /* Mark all of the entries that are found or don't exist */
863 netdev_for_each_mc_addr(ha, dev) {
864 union ib_gid mgid;
865
866 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
867 continue;
868
869 memcpy(mgid.raw, ha->addr + 4, sizeof mgid);
870
871 mcast = __ipoib_mcast_find(dev, &mgid);
872 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
873 struct ipoib_mcast *nmcast;
874
875 /* ignore group which is directly joined by userspace */
876 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
877 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
878 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
879 mgid.raw);
880 continue;
881 }
882
883 /* Not found or send-only group, let's add a new entry */
884 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
885 mgid.raw);
886
887 nmcast = ipoib_mcast_alloc(dev, 0);
888 if (!nmcast) {
889 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
890 continue;
891 }
892
893 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
894
895 nmcast->mcmember.mgid = mgid;
896
897 if (mcast) {
898 /* Destroy the send only entry */
899 list_move_tail(&mcast->list, &remove_list);
900
901 rb_replace_node(&mcast->rb_node,
902 &nmcast->rb_node,
903 &priv->multicast_tree);
904 } else
905 __ipoib_mcast_add(dev, nmcast);
906
907 list_add_tail(&nmcast->list, &priv->multicast_list);
908 }
909
910 if (mcast)
911 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
912 }
913
914 /* Remove all of the entries don't exist anymore */
915 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
916 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
917 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
918 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
919 mcast->mcmember.mgid.raw);
920
921 rb_erase(&mcast->rb_node, &priv->multicast_tree);
922
923 /* Move to the remove list */
924 list_move_tail(&mcast->list, &remove_list);
925 }
926 }
927
928 spin_unlock(&priv->lock);
929 netif_addr_unlock(dev);
930 local_irq_restore(flags);
931
932 /*
933 * make sure the in-flight joins have finished before we attempt
934 * to leave
935 */
936 list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
937 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
938 wait_for_completion(&mcast->done);
939
940 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
941 ipoib_mcast_leave(mcast->dev, mcast);
942 ipoib_mcast_free(mcast);
943 }
944
945 /*
946 * Double check that we are still up
947 */
948 if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
949 spin_lock_irqsave(&priv->lock, flags);
950 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
951 spin_unlock_irqrestore(&priv->lock, flags);
952 }
953 }
954
955 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
956
957 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
958 {
959 struct ipoib_mcast_iter *iter;
960
961 iter = kmalloc(sizeof *iter, GFP_KERNEL);
962 if (!iter)
963 return NULL;
964
965 iter->dev = dev;
966 memset(iter->mgid.raw, 0, 16);
967
968 if (ipoib_mcast_iter_next(iter)) {
969 kfree(iter);
970 return NULL;
971 }
972
973 return iter;
974 }
975
976 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
977 {
978 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
979 struct rb_node *n;
980 struct ipoib_mcast *mcast;
981 int ret = 1;
982
983 spin_lock_irq(&priv->lock);
984
985 n = rb_first(&priv->multicast_tree);
986
987 while (n) {
988 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
989
990 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
991 sizeof (union ib_gid)) < 0) {
992 iter->mgid = mcast->mcmember.mgid;
993 iter->created = mcast->created;
994 iter->queuelen = skb_queue_len(&mcast->pkt_queue);
995 iter->complete = !!mcast->ah;
996 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
997
998 ret = 0;
999
1000 break;
1001 }
1002
1003 n = rb_next(n);
1004 }
1005
1006 spin_unlock_irq(&priv->lock);
1007
1008 return ret;
1009 }
1010
1011 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
1012 union ib_gid *mgid,
1013 unsigned long *created,
1014 unsigned int *queuelen,
1015 unsigned int *complete,
1016 unsigned int *send_only)
1017 {
1018 *mgid = iter->mgid;
1019 *created = iter->created;
1020 *queuelen = iter->queuelen;
1021 *complete = iter->complete;
1022 *send_only = iter->send_only;
1023 }
1024
1025 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
Linux kernel - Deliverables
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