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Linux 4.1.16
[linux/fpc-iii.git] / drivers / infiniband / ulp / ipoib / ipoib_multicast.c
blob0d23e0568deb6fee19247ddbe43fbaabc477edf4
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 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 /*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 if (mcast->logcount++ < 20) {
397 if (status == -ETIMEDOUT || status == -EAGAIN) {
398 ipoib_dbg_mcast(priv, "%smulticast join failed for %pI6, status %d\n",
399 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
400 mcast->mcmember.mgid.raw, status);
401 } else {
402 ipoib_warn(priv, "%smulticast join failed for %pI6, status %d\n",
403 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
404 mcast->mcmember.mgid.raw, status);
405 }
406 }
407
408 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
409 mcast->backoff >= 2) {
410 /*
411 * We only retry sendonly joins once before we drop
412 * the packet and quit trying to deal with the
413 * group. However, we leave the group in the
414 * mcast list as an unjoined group. If we want to
415 * try joining again, we simply queue up a packet
416 * and restart the join thread. The empty queue
417 * is why the join thread ignores this group.
418 */
419 mcast->backoff = 1;
420 netif_tx_lock_bh(dev);
421 while (!skb_queue_empty(&mcast->pkt_queue)) {
422 ++dev->stats.tx_dropped;
423 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
424 }
425 netif_tx_unlock_bh(dev);
426 } else {
427 spin_lock_irq(&priv->lock);
428 /* Requeue this join task with a backoff delay */
429 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
430 goto out_locked;
431 }
432 }
433 out:
434 spin_lock_irq(&priv->lock);
435 out_locked:
436 /*
437 * Make sure to set mcast->mc before we clear the busy flag to avoid
438 * racing with code that checks for BUSY before checking mcast->mc
439 */
440 if (status)
441 mcast->mc = NULL;
442 else
443 mcast->mc = multicast;
444 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
445 spin_unlock_irq(&priv->lock);
446 complete(&mcast->done);
447
448 return status;
449 }
450
451 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
452 int create)
453 {
454 struct ipoib_dev_priv *priv = netdev_priv(dev);
455 struct ib_sa_multicast *multicast;
456 struct ib_sa_mcmember_rec rec = {
457 .join_state = 1
458 };
459 ib_sa_comp_mask comp_mask;
460 int ret = 0;
461
462 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
463
464 rec.mgid = mcast->mcmember.mgid;
465 rec.port_gid = priv->local_gid;
466 rec.pkey = cpu_to_be16(priv->pkey);
467
468 comp_mask =
469 IB_SA_MCMEMBER_REC_MGID |
470 IB_SA_MCMEMBER_REC_PORT_GID |
471 IB_SA_MCMEMBER_REC_PKEY |
472 IB_SA_MCMEMBER_REC_JOIN_STATE;
473
474 if (create) {
475 comp_mask |=
476 IB_SA_MCMEMBER_REC_QKEY |
477 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
478 IB_SA_MCMEMBER_REC_MTU |
479 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |
480 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
481 IB_SA_MCMEMBER_REC_RATE |
482 IB_SA_MCMEMBER_REC_SL |
483 IB_SA_MCMEMBER_REC_FLOW_LABEL |
484 IB_SA_MCMEMBER_REC_HOP_LIMIT;
485
486 rec.qkey = priv->broadcast->mcmember.qkey;
487 rec.mtu_selector = IB_SA_EQ;
488 rec.mtu = priv->broadcast->mcmember.mtu;
489 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
490 rec.rate_selector = IB_SA_EQ;
491 rec.rate = priv->broadcast->mcmember.rate;
492 rec.sl = priv->broadcast->mcmember.sl;
493 rec.flow_label = priv->broadcast->mcmember.flow_label;
494 rec.hop_limit = priv->broadcast->mcmember.hop_limit;
495 }
496
497 multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
498 &rec, comp_mask, GFP_KERNEL,
499 ipoib_mcast_join_complete, mcast);
500 if (IS_ERR(multicast)) {
501 ret = PTR_ERR(multicast);
502 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
503 spin_lock_irq(&priv->lock);
504 /* Requeue this join task with a backoff delay */
505 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
506 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
507 spin_unlock_irq(&priv->lock);
508 complete(&mcast->done);
509 }
510 }
511
512 void ipoib_mcast_join_task(struct work_struct *work)
513 {
514 struct ipoib_dev_priv *priv =
515 container_of(work, struct ipoib_dev_priv, mcast_task.work);
516 struct net_device *dev = priv->dev;
517 struct ib_port_attr port_attr;
518 unsigned long delay_until = 0;
519 struct ipoib_mcast *mcast = NULL;
520 int create = 1;
521
522 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
523 return;
524
525 if (ib_query_port(priv->ca, priv->port, &port_attr) ||
526 port_attr.state != IB_PORT_ACTIVE) {
527 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
528 port_attr.state);
529 return;
530 }
531 priv->local_lid = port_attr.lid;
532
533 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
534 ipoib_warn(priv, "ib_query_gid() failed\n");
535 else
536 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
537
538 spin_lock_irq(&priv->lock);
539 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
540 goto out;
541
542 if (!priv->broadcast) {
543 struct ipoib_mcast *broadcast;
544
545 broadcast = ipoib_mcast_alloc(dev, 0);
546 if (!broadcast) {
547 ipoib_warn(priv, "failed to allocate broadcast group\n");
548 /*
549 * Restart us after a 1 second delay to retry
550 * creating our broadcast group and attaching to
551 * it. Until this succeeds, this ipoib dev is
552 * completely stalled (multicast wise).
553 */
554 __ipoib_mcast_schedule_join_thread(priv, NULL, 1);
555 goto out;
556 }
557
558 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
559 sizeof (union ib_gid));
560 priv->broadcast = broadcast;
561
562 __ipoib_mcast_add(dev, priv->broadcast);
563 }
564
565 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
566 if (IS_ERR_OR_NULL(priv->broadcast->mc) &&
567 !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) {
568 mcast = priv->broadcast;
569 create = 0;
570 if (mcast->backoff > 1 &&
571 time_before(jiffies, mcast->delay_until)) {
572 delay_until = mcast->delay_until;
573 mcast = NULL;
574 }
575 }
576 goto out;
577 }
578
579 /*
580 * We'll never get here until the broadcast group is both allocated
581 * and attached
582 */
583 list_for_each_entry(mcast, &priv->multicast_list, list) {
584 if (IS_ERR_OR_NULL(mcast->mc) &&
585 !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&
586 (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ||
587 !skb_queue_empty(&mcast->pkt_queue))) {
588 if (mcast->backoff == 1 ||
589 time_after_eq(jiffies, mcast->delay_until)) {
590 /* Found the next unjoined group */
591 init_completion(&mcast->done);
592 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
593 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
594 create = 0;
595 else
596 create = 1;
597 spin_unlock_irq(&priv->lock);
598 ipoib_mcast_join(dev, mcast, create);
599 spin_lock_irq(&priv->lock);
600 } else if (!delay_until ||
601 time_before(mcast->delay_until, delay_until))
602 delay_until = mcast->delay_until;
603 }
604 }
605
606 mcast = NULL;
607 ipoib_dbg_mcast(priv, "successfully started all multicast joins\n");
608
609 out:
610 if (delay_until) {
611 cancel_delayed_work(&priv->mcast_task);
612 queue_delayed_work(priv->wq, &priv->mcast_task,
613 delay_until - jiffies);
614 }
615 if (mcast) {
616 init_completion(&mcast->done);
617 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
618 }
619 spin_unlock_irq(&priv->lock);
620 if (mcast)
621 ipoib_mcast_join(dev, mcast, create);
622 }
623
624 int ipoib_mcast_start_thread(struct net_device *dev)
625 {
626 struct ipoib_dev_priv *priv = netdev_priv(dev);
627 unsigned long flags;
628
629 ipoib_dbg_mcast(priv, "starting multicast thread\n");
630
631 spin_lock_irqsave(&priv->lock, flags);
632 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
633 spin_unlock_irqrestore(&priv->lock, flags);
634
635 return 0;
636 }
637
638 int ipoib_mcast_stop_thread(struct net_device *dev)
639 {
640 struct ipoib_dev_priv *priv = netdev_priv(dev);
641 unsigned long flags;
642
643 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
644
645 spin_lock_irqsave(&priv->lock, flags);
646 cancel_delayed_work(&priv->mcast_task);
647 spin_unlock_irqrestore(&priv->lock, flags);
648
649 flush_workqueue(priv->wq);
650
651 return 0;
652 }
653
654 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
655 {
656 struct ipoib_dev_priv *priv = netdev_priv(dev);
657 int ret = 0;
658
659 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
660 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
661
662 if (!IS_ERR_OR_NULL(mcast->mc))
663 ib_sa_free_multicast(mcast->mc);
664
665 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
666 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
667 mcast->mcmember.mgid.raw);
668
669 /* Remove ourselves from the multicast group */
670 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
671 be16_to_cpu(mcast->mcmember.mlid));
672 if (ret)
673 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
674 } else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
675 ipoib_dbg(priv, "leaving with no mcmember but not a "
676 "SENDONLY join\n");
677
678 return 0;
679 }
680
681 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
682 {
683 struct ipoib_dev_priv *priv = netdev_priv(dev);
684 struct ipoib_mcast *mcast;
685 unsigned long flags;
686 void *mgid = daddr + 4;
687
688 spin_lock_irqsave(&priv->lock, flags);
689
690 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) ||
691 !priv->broadcast ||
692 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
693 ++dev->stats.tx_dropped;
694 dev_kfree_skb_any(skb);
695 goto unlock;
696 }
697
698 mcast = __ipoib_mcast_find(dev, mgid);
699 if (!mcast || !mcast->ah) {
700 if (!mcast) {
701 /* Let's create a new send only group now */
702 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
703 mgid);
704
705 mcast = ipoib_mcast_alloc(dev, 0);
706 if (!mcast) {
707 ipoib_warn(priv, "unable to allocate memory "
708 "for multicast structure\n");
709 ++dev->stats.tx_dropped;
710 dev_kfree_skb_any(skb);
711 goto unlock;
712 }
713
714 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
715 memcpy(mcast->mcmember.mgid.raw, mgid,
716 sizeof (union ib_gid));
717 __ipoib_mcast_add(dev, mcast);
718 list_add_tail(&mcast->list, &priv->multicast_list);
719 }
720 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
721 skb_queue_tail(&mcast->pkt_queue, skb);
722 else {
723 ++dev->stats.tx_dropped;
724 dev_kfree_skb_any(skb);
725 }
726 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
727 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
728 }
729 } else {
730 struct ipoib_neigh *neigh;
731
732 spin_unlock_irqrestore(&priv->lock, flags);
733 neigh = ipoib_neigh_get(dev, daddr);
734 spin_lock_irqsave(&priv->lock, flags);
735 if (!neigh) {
736 neigh = ipoib_neigh_alloc(daddr, dev);
737 if (neigh) {
738 kref_get(&mcast->ah->ref);
739 neigh->ah = mcast->ah;
740 list_add_tail(&neigh->list, &mcast->neigh_list);
741 }
742 }
743 spin_unlock_irqrestore(&priv->lock, flags);
744 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
745 if (neigh)
746 ipoib_neigh_put(neigh);
747 return;
748 }
749
750 unlock:
751 spin_unlock_irqrestore(&priv->lock, flags);
752 }
753
754 void ipoib_mcast_dev_flush(struct net_device *dev)
755 {
756 struct ipoib_dev_priv *priv = netdev_priv(dev);
757 LIST_HEAD(remove_list);
758 struct ipoib_mcast *mcast, *tmcast;
759 unsigned long flags;
760
761 ipoib_dbg_mcast(priv, "flushing multicast list\n");
762
763 spin_lock_irqsave(&priv->lock, flags);
764
765 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
766 list_del(&mcast->list);
767 rb_erase(&mcast->rb_node, &priv->multicast_tree);
768 list_add_tail(&mcast->list, &remove_list);
769 }
770
771 if (priv->broadcast) {
772 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
773 list_add_tail(&priv->broadcast->list, &remove_list);
774 priv->broadcast = NULL;
775 }
776
777 spin_unlock_irqrestore(&priv->lock, flags);
778
779 /*
780 * make sure the in-flight joins have finished before we attempt
781 * to leave
782 */
783 list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
784 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
785 wait_for_completion(&mcast->done);
786
787 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
788 ipoib_mcast_leave(dev, mcast);
789 ipoib_mcast_free(mcast);
790 }
791 }
792
793 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
794 {
795 /* reserved QPN, prefix, scope */
796 if (memcmp(addr, broadcast, 6))
797 return 0;
798 /* signature lower, pkey */
799 if (memcmp(addr + 7, broadcast + 7, 3))
800 return 0;
801 return 1;
802 }
803
804 void ipoib_mcast_restart_task(struct work_struct *work)
805 {
806 struct ipoib_dev_priv *priv =
807 container_of(work, struct ipoib_dev_priv, restart_task);
808 struct net_device *dev = priv->dev;
809 struct netdev_hw_addr *ha;
810 struct ipoib_mcast *mcast, *tmcast;
811 LIST_HEAD(remove_list);
812 unsigned long flags;
813 struct ib_sa_mcmember_rec rec;
814
815 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
816 /*
817 * shortcut...on shutdown flush is called next, just
818 * let it do all the work
819 */
820 return;
821
822 ipoib_dbg_mcast(priv, "restarting multicast task\n");
823
824 local_irq_save(flags);
825 netif_addr_lock(dev);
826 spin_lock(&priv->lock);
827
828 /*
829 * Unfortunately, the networking core only gives us a list of all of
830 * the multicast hardware addresses. We need to figure out which ones
831 * are new and which ones have been removed
832 */
833
834 /* Clear out the found flag */
835 list_for_each_entry(mcast, &priv->multicast_list, list)
836 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
837
838 /* Mark all of the entries that are found or don't exist */
839 netdev_for_each_mc_addr(ha, dev) {
840 union ib_gid mgid;
841
842 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
843 continue;
844
845 memcpy(mgid.raw, ha->addr + 4, sizeof mgid);
846
847 mcast = __ipoib_mcast_find(dev, &mgid);
848 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
849 struct ipoib_mcast *nmcast;
850
851 /* ignore group which is directly joined by userspace */
852 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
853 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
854 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
855 mgid.raw);
856 continue;
857 }
858
859 /* Not found or send-only group, let's add a new entry */
860 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
861 mgid.raw);
862
863 nmcast = ipoib_mcast_alloc(dev, 0);
864 if (!nmcast) {
865 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
866 continue;
867 }
868
869 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
870
871 nmcast->mcmember.mgid = mgid;
872
873 if (mcast) {
874 /* Destroy the send only entry */
875 list_move_tail(&mcast->list, &remove_list);
876
877 rb_replace_node(&mcast->rb_node,
878 &nmcast->rb_node,
879 &priv->multicast_tree);
880 } else
881 __ipoib_mcast_add(dev, nmcast);
882
883 list_add_tail(&nmcast->list, &priv->multicast_list);
884 }
885
886 if (mcast)
887 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
888 }
889
890 /* Remove all of the entries don't exist anymore */
891 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
892 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
893 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
894 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
895 mcast->mcmember.mgid.raw);
896
897 rb_erase(&mcast->rb_node, &priv->multicast_tree);
898
899 /* Move to the remove list */
900 list_move_tail(&mcast->list, &remove_list);
901 }
902 }
903
904 spin_unlock(&priv->lock);
905 netif_addr_unlock(dev);
906 local_irq_restore(flags);
907
908 /*
909 * make sure the in-flight joins have finished before we attempt
910 * to leave
911 */
912 list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
913 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
914 wait_for_completion(&mcast->done);
915
916 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
917 ipoib_mcast_leave(mcast->dev, mcast);
918 ipoib_mcast_free(mcast);
919 }
920
921 /*
922 * Double check that we are still up
923 */
924 if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
925 spin_lock_irqsave(&priv->lock, flags);
926 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
927 spin_unlock_irqrestore(&priv->lock, flags);
928 }
929 }
930
931 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
932
933 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
934 {
935 struct ipoib_mcast_iter *iter;
936
937 iter = kmalloc(sizeof *iter, GFP_KERNEL);
938 if (!iter)
939 return NULL;
940
941 iter->dev = dev;
942 memset(iter->mgid.raw, 0, 16);
943
944 if (ipoib_mcast_iter_next(iter)) {
945 kfree(iter);
946 return NULL;
947 }
948
949 return iter;
950 }
951
952 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
953 {
954 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
955 struct rb_node *n;
956 struct ipoib_mcast *mcast;
957 int ret = 1;
958
959 spin_lock_irq(&priv->lock);
960
961 n = rb_first(&priv->multicast_tree);
962
963 while (n) {
964 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
965
966 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
967 sizeof (union ib_gid)) < 0) {
968 iter->mgid = mcast->mcmember.mgid;
969 iter->created = mcast->created;
970 iter->queuelen = skb_queue_len(&mcast->pkt_queue);
971 iter->complete = !!mcast->ah;
972 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
973
974 ret = 0;
975
976 break;
977 }
978
979 n = rb_next(n);
980 }
981
982 spin_unlock_irq(&priv->lock);
983
984 return ret;
985 }
986
987 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
988 union ib_gid *mgid,
989 unsigned long *created,
990 unsigned int *queuelen,
991 unsigned int *complete,
992 unsigned int *send_only)
993 {
994 *mgid = iter->mgid;
995 *created = iter->created;
996 *queuelen = iter->queuelen;
997 *complete = iter->complete;
998 *send_only = iter->send_only;
999 }
1000
1001 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
Linux with added FPC-III support