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[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 /* join state that allows creating mcg with sendonly member request */
68 #define SENDONLY_FULLMEMBER_JOIN 8
69
70 /*
71 * This should be called with the priv->lock held
72 */
73 static void __ipoib_mcast_schedule_join_thread(struct ipoib_dev_priv *priv,
74 struct ipoib_mcast *mcast,
75 bool delay)
76 {
77 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
78 return;
79
80 /*
81 * We will be scheduling *something*, so cancel whatever is
82 * currently scheduled first
83 */
84 cancel_delayed_work(&priv->mcast_task);
85 if (mcast && delay) {
86 /*
87 * We had a failure and want to schedule a retry later
88 */
89 mcast->backoff *= 2;
90 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
91 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
92 mcast->delay_until = jiffies + (mcast->backoff * HZ);
93 /*
94 * Mark this mcast for its delay, but restart the
95 * task immediately. The join task will make sure to
96 * clear out all entries without delays, and then
97 * schedule itself to run again when the earliest
98 * delay expires
99 */
100 queue_delayed_work(priv->wq, &priv->mcast_task, 0);
101 } else if (delay) {
102 /*
103 * Special case of retrying after a failure to
104 * allocate the broadcast multicast group, wait
105 * 1 second and try again
106 */
107 queue_delayed_work(priv->wq, &priv->mcast_task, HZ);
108 } else
109 queue_delayed_work(priv->wq, &priv->mcast_task, 0);
110 }
111
112 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
113 {
114 struct net_device *dev = mcast->dev;
115 int tx_dropped = 0;
116
117 ipoib_dbg_mcast(netdev_priv(dev), "deleting multicast group %pI6\n",
118 mcast->mcmember.mgid.raw);
119
120 /* remove all neigh connected to this mcast */
121 ipoib_del_neighs_by_gid(dev, mcast->mcmember.mgid.raw);
122
123 if (mcast->ah)
124 ipoib_put_ah(mcast->ah);
125
126 while (!skb_queue_empty(&mcast->pkt_queue)) {
127 ++tx_dropped;
128 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
129 }
130
131 netif_tx_lock_bh(dev);
132 dev->stats.tx_dropped += tx_dropped;
133 netif_tx_unlock_bh(dev);
134
135 kfree(mcast);
136 }
137
138 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
139 int can_sleep)
140 {
141 struct ipoib_mcast *mcast;
142
143 mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
144 if (!mcast)
145 return NULL;
146
147 mcast->dev = dev;
148 mcast->created = jiffies;
149 mcast->delay_until = jiffies;
150 mcast->backoff = 1;
151
152 INIT_LIST_HEAD(&mcast->list);
153 INIT_LIST_HEAD(&mcast->neigh_list);
154 skb_queue_head_init(&mcast->pkt_queue);
155
156 return mcast;
157 }
158
159 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
160 {
161 struct ipoib_dev_priv *priv = netdev_priv(dev);
162 struct rb_node *n = priv->multicast_tree.rb_node;
163
164 while (n) {
165 struct ipoib_mcast *mcast;
166 int ret;
167
168 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
169
170 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
171 sizeof (union ib_gid));
172 if (ret < 0)
173 n = n->rb_left;
174 else if (ret > 0)
175 n = n->rb_right;
176 else
177 return mcast;
178 }
179
180 return NULL;
181 }
182
183 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
184 {
185 struct ipoib_dev_priv *priv = netdev_priv(dev);
186 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
187
188 while (*n) {
189 struct ipoib_mcast *tmcast;
190 int ret;
191
192 pn = *n;
193 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
194
195 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
196 sizeof (union ib_gid));
197 if (ret < 0)
198 n = &pn->rb_left;
199 else if (ret > 0)
200 n = &pn->rb_right;
201 else
202 return -EEXIST;
203 }
204
205 rb_link_node(&mcast->rb_node, pn, n);
206 rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
207
208 return 0;
209 }
210
211 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
212 struct ib_sa_mcmember_rec *mcmember)
213 {
214 struct net_device *dev = mcast->dev;
215 struct ipoib_dev_priv *priv = netdev_priv(dev);
216 struct ipoib_ah *ah;
217 int ret;
218 int set_qkey = 0;
219
220 mcast->mcmember = *mcmember;
221
222 /* Set the multicast MTU and cached Q_Key before we attach if it's
223 * the broadcast group.
224 */
225 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
226 sizeof (union ib_gid))) {
227 spin_lock_irq(&priv->lock);
228 if (!priv->broadcast) {
229 spin_unlock_irq(&priv->lock);
230 return -EAGAIN;
231 }
232 /*update priv member according to the new mcast*/
233 priv->broadcast->mcmember.qkey = mcmember->qkey;
234 priv->broadcast->mcmember.mtu = mcmember->mtu;
235 priv->broadcast->mcmember.traffic_class = mcmember->traffic_class;
236 priv->broadcast->mcmember.rate = mcmember->rate;
237 priv->broadcast->mcmember.sl = mcmember->sl;
238 priv->broadcast->mcmember.flow_label = mcmember->flow_label;
239 priv->broadcast->mcmember.hop_limit = mcmember->hop_limit;
240 /* assume if the admin and the mcast are the same both can be changed */
241 if (priv->mcast_mtu == priv->admin_mtu)
242 priv->admin_mtu =
243 priv->mcast_mtu =
244 IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
245 else
246 priv->mcast_mtu =
247 IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
248
249 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
250 spin_unlock_irq(&priv->lock);
251 priv->tx_wr.remote_qkey = priv->qkey;
252 set_qkey = 1;
253 }
254
255 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
256 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
257 ipoib_warn(priv, "multicast group %pI6 already attached\n",
258 mcast->mcmember.mgid.raw);
259
260 return 0;
261 }
262
263 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
264 &mcast->mcmember.mgid, set_qkey);
265 if (ret < 0) {
266 ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
267 mcast->mcmember.mgid.raw);
268
269 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
270 return ret;
271 }
272 }
273
274 {
275 struct ib_ah_attr av = {
276 .dlid = be16_to_cpu(mcast->mcmember.mlid),
277 .port_num = priv->port,
278 .sl = mcast->mcmember.sl,
279 .ah_flags = IB_AH_GRH,
280 .static_rate = mcast->mcmember.rate,
281 .grh = {
282 .flow_label = be32_to_cpu(mcast->mcmember.flow_label),
283 .hop_limit = mcast->mcmember.hop_limit,
284 .sgid_index = 0,
285 .traffic_class = mcast->mcmember.traffic_class
286 }
287 };
288 av.grh.dgid = mcast->mcmember.mgid;
289
290 ah = ipoib_create_ah(dev, priv->pd, &av);
291 if (IS_ERR(ah)) {
292 ipoib_warn(priv, "ib_address_create failed %ld\n",
293 -PTR_ERR(ah));
294 /* use original error */
295 return PTR_ERR(ah);
296 } else {
297 spin_lock_irq(&priv->lock);
298 mcast->ah = ah;
299 spin_unlock_irq(&priv->lock);
300
301 ipoib_dbg_mcast(priv, "MGID %pI6 AV %p, LID 0x%04x, SL %d\n",
302 mcast->mcmember.mgid.raw,
303 mcast->ah->ah,
304 be16_to_cpu(mcast->mcmember.mlid),
305 mcast->mcmember.sl);
306 }
307 }
308
309 /* actually send any queued packets */
310 netif_tx_lock_bh(dev);
311 while (!skb_queue_empty(&mcast->pkt_queue)) {
312 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
313
314 netif_tx_unlock_bh(dev);
315
316 skb->dev = dev;
317 if (dev_queue_xmit(skb))
318 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
319
320 netif_tx_lock_bh(dev);
321 }
322 netif_tx_unlock_bh(dev);
323
324 return 0;
325 }
326
327 void ipoib_mcast_carrier_on_task(struct work_struct *work)
328 {
329 struct ipoib_dev_priv *priv = container_of(work, struct ipoib_dev_priv,
330 carrier_on_task);
331 struct ib_port_attr attr;
332 int ret;
333
334 if (ib_query_port(priv->ca, priv->port, &attr) ||
335 attr.state != IB_PORT_ACTIVE) {
336 ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
337 return;
338 }
339 /*
340 * Check if can send sendonly MCG's with sendonly-fullmember join state.
341 * It done here after the successfully join to the broadcast group,
342 * because the broadcast group must always be joined first and is always
343 * re-joined if the SM changes substantially.
344 */
345 ret = ipoib_check_sm_sendonly_fullmember_support(priv);
346 if (ret < 0)
347 pr_debug("%s failed query sm support for sendonly-fullmember (ret: %d)\n",
348 priv->dev->name, ret);
349
350 /*
351 * Take rtnl_lock to avoid racing with ipoib_stop() and
352 * turning the carrier back on while a device is being
353 * removed. However, ipoib_stop() will attempt to flush
354 * the workqueue while holding the rtnl lock, so loop
355 * on trylock until either we get the lock or we see
356 * FLAG_OPER_UP go away as that signals that we are bailing
357 * and can safely ignore the carrier on work.
358 */
359 while (!rtnl_trylock()) {
360 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
361 return;
362 else
363 msleep(20);
364 }
365 if (!ipoib_cm_admin_enabled(priv->dev))
366 dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
367 netif_carrier_on(priv->dev);
368 rtnl_unlock();
369 }
370
371 static int ipoib_mcast_join_complete(int status,
372 struct ib_sa_multicast *multicast)
373 {
374 struct ipoib_mcast *mcast = multicast->context;
375 struct net_device *dev = mcast->dev;
376 struct ipoib_dev_priv *priv = netdev_priv(dev);
377
378 ipoib_dbg_mcast(priv, "%sjoin completion for %pI6 (status %d)\n",
379 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ?
380 "sendonly " : "",
381 mcast->mcmember.mgid.raw, status);
382
383 /* We trap for port events ourselves. */
384 if (status == -ENETRESET) {
385 status = 0;
386 goto out;
387 }
388
389 if (!status)
390 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
391
392 if (!status) {
393 mcast->backoff = 1;
394 mcast->delay_until = jiffies;
395
396 /*
397 * Defer carrier on work to priv->wq to avoid a
398 * deadlock on rtnl_lock here. Requeue our multicast
399 * work too, which will end up happening right after
400 * our carrier on task work and will allow us to
401 * send out all of the non-broadcast joins
402 */
403 if (mcast == priv->broadcast) {
404 spin_lock_irq(&priv->lock);
405 queue_work(priv->wq, &priv->carrier_on_task);
406 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
407 goto out_locked;
408 }
409 } else {
410 bool silent_fail =
411 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
412 status == -EINVAL;
413
414 if (mcast->logcount < 20) {
415 if (status == -ETIMEDOUT || status == -EAGAIN ||
416 silent_fail) {
417 ipoib_dbg_mcast(priv, "%smulticast join failed for %pI6, status %d\n",
418 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
419 mcast->mcmember.mgid.raw, status);
420 } else {
421 ipoib_warn(priv, "%smulticast join failed for %pI6, status %d\n",
422 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
423 mcast->mcmember.mgid.raw, status);
424 }
425
426 if (!silent_fail)
427 mcast->logcount++;
428 }
429
430 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
431 mcast->backoff >= 2) {
432 /*
433 * We only retry sendonly joins once before we drop
434 * the packet and quit trying to deal with the
435 * group. However, we leave the group in the
436 * mcast list as an unjoined group. If we want to
437 * try joining again, we simply queue up a packet
438 * and restart the join thread. The empty queue
439 * is why the join thread ignores this group.
440 */
441 mcast->backoff = 1;
442 netif_tx_lock_bh(dev);
443 while (!skb_queue_empty(&mcast->pkt_queue)) {
444 ++dev->stats.tx_dropped;
445 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
446 }
447 netif_tx_unlock_bh(dev);
448 } else {
449 spin_lock_irq(&priv->lock);
450 /* Requeue this join task with a backoff delay */
451 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
452 goto out_locked;
453 }
454 }
455 out:
456 spin_lock_irq(&priv->lock);
457 out_locked:
458 /*
459 * Make sure to set mcast->mc before we clear the busy flag to avoid
460 * racing with code that checks for BUSY before checking mcast->mc
461 */
462 if (status)
463 mcast->mc = NULL;
464 else
465 mcast->mc = multicast;
466 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
467 spin_unlock_irq(&priv->lock);
468 complete(&mcast->done);
469
470 return status;
471 }
472
473 /*
474 * Caller must hold 'priv->lock'
475 */
476 static int ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast)
477 {
478 struct ipoib_dev_priv *priv = netdev_priv(dev);
479 struct ib_sa_multicast *multicast;
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 if (!priv->broadcast ||
487 !test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
488 return -EINVAL;
489
490 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
491
492 rec.mgid = mcast->mcmember.mgid;
493 rec.port_gid = priv->local_gid;
494 rec.pkey = cpu_to_be16(priv->pkey);
495
496 comp_mask =
497 IB_SA_MCMEMBER_REC_MGID |
498 IB_SA_MCMEMBER_REC_PORT_GID |
499 IB_SA_MCMEMBER_REC_PKEY |
500 IB_SA_MCMEMBER_REC_JOIN_STATE;
501
502 if (mcast != priv->broadcast) {
503 /*
504 * RFC 4391:
505 * The MGID MUST use the same P_Key, Q_Key, SL, MTU,
506 * and HopLimit as those used in the broadcast-GID. The rest
507 * of attributes SHOULD follow the values used in the
508 * broadcast-GID as well.
509 */
510 comp_mask |=
511 IB_SA_MCMEMBER_REC_QKEY |
512 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
513 IB_SA_MCMEMBER_REC_MTU |
514 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |
515 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
516 IB_SA_MCMEMBER_REC_RATE |
517 IB_SA_MCMEMBER_REC_SL |
518 IB_SA_MCMEMBER_REC_FLOW_LABEL |
519 IB_SA_MCMEMBER_REC_HOP_LIMIT;
520
521 rec.qkey = priv->broadcast->mcmember.qkey;
522 rec.mtu_selector = IB_SA_EQ;
523 rec.mtu = priv->broadcast->mcmember.mtu;
524 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
525 rec.rate_selector = IB_SA_EQ;
526 rec.rate = priv->broadcast->mcmember.rate;
527 rec.sl = priv->broadcast->mcmember.sl;
528 rec.flow_label = priv->broadcast->mcmember.flow_label;
529 rec.hop_limit = priv->broadcast->mcmember.hop_limit;
530
531 /*
532 * Send-only IB Multicast joins work at the core IB layer but
533 * require specific SM support.
534 * We can use such joins here only if the current SM supports that feature.
535 * However, if not, we emulate an Ethernet multicast send,
536 * which does not require a multicast subscription and will
537 * still send properly. The most appropriate thing to
538 * do is to create the group if it doesn't exist as that
539 * most closely emulates the behavior, from a user space
540 * application perspective, of Ethernet multicast operation.
541 */
542 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
543 priv->sm_fullmember_sendonly_support)
544 /* SM supports sendonly-fullmember, otherwise fallback to full-member */
545 rec.join_state = SENDONLY_FULLMEMBER_JOIN;
546 }
547 spin_unlock_irq(&priv->lock);
548
549 multicast = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
550 &rec, comp_mask, GFP_KERNEL,
551 ipoib_mcast_join_complete, mcast);
552 spin_lock_irq(&priv->lock);
553 if (IS_ERR(multicast)) {
554 ret = PTR_ERR(multicast);
555 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
556 /* Requeue this join task with a backoff delay */
557 __ipoib_mcast_schedule_join_thread(priv, mcast, 1);
558 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
559 spin_unlock_irq(&priv->lock);
560 complete(&mcast->done);
561 spin_lock_irq(&priv->lock);
562 }
563 return 0;
564 }
565
566 void ipoib_mcast_join_task(struct work_struct *work)
567 {
568 struct ipoib_dev_priv *priv =
569 container_of(work, struct ipoib_dev_priv, mcast_task.work);
570 struct net_device *dev = priv->dev;
571 struct ib_port_attr port_attr;
572 unsigned long delay_until = 0;
573 struct ipoib_mcast *mcast = NULL;
574
575 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
576 return;
577
578 if (ib_query_port(priv->ca, priv->port, &port_attr) ||
579 port_attr.state != IB_PORT_ACTIVE) {
580 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
581 port_attr.state);
582 return;
583 }
584 priv->local_lid = port_attr.lid;
585 netif_addr_lock(dev);
586
587 if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
588 netif_addr_unlock(dev);
589 return;
590 }
591 netif_addr_unlock(dev);
592
593 spin_lock_irq(&priv->lock);
594 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
595 goto out;
596
597 if (!priv->broadcast) {
598 struct ipoib_mcast *broadcast;
599
600 broadcast = ipoib_mcast_alloc(dev, 0);
601 if (!broadcast) {
602 ipoib_warn(priv, "failed to allocate broadcast group\n");
603 /*
604 * Restart us after a 1 second delay to retry
605 * creating our broadcast group and attaching to
606 * it. Until this succeeds, this ipoib dev is
607 * completely stalled (multicast wise).
608 */
609 __ipoib_mcast_schedule_join_thread(priv, NULL, 1);
610 goto out;
611 }
612
613 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
614 sizeof (union ib_gid));
615 priv->broadcast = broadcast;
616
617 __ipoib_mcast_add(dev, priv->broadcast);
618 }
619
620 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
621 if (IS_ERR_OR_NULL(priv->broadcast->mc) &&
622 !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) {
623 mcast = priv->broadcast;
624 if (mcast->backoff > 1 &&
625 time_before(jiffies, mcast->delay_until)) {
626 delay_until = mcast->delay_until;
627 mcast = NULL;
628 }
629 }
630 goto out;
631 }
632
633 /*
634 * We'll never get here until the broadcast group is both allocated
635 * and attached
636 */
637 list_for_each_entry(mcast, &priv->multicast_list, list) {
638 if (IS_ERR_OR_NULL(mcast->mc) &&
639 !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&
640 (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ||
641 !skb_queue_empty(&mcast->pkt_queue))) {
642 if (mcast->backoff == 1 ||
643 time_after_eq(jiffies, mcast->delay_until)) {
644 /* Found the next unjoined group */
645 init_completion(&mcast->done);
646 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
647 if (ipoib_mcast_join(dev, mcast)) {
648 spin_unlock_irq(&priv->lock);
649 return;
650 }
651 } else if (!delay_until ||
652 time_before(mcast->delay_until, delay_until))
653 delay_until = mcast->delay_until;
654 }
655 }
656
657 mcast = NULL;
658 ipoib_dbg_mcast(priv, "successfully started all multicast joins\n");
659
660 out:
661 if (delay_until) {
662 cancel_delayed_work(&priv->mcast_task);
663 queue_delayed_work(priv->wq, &priv->mcast_task,
664 delay_until - jiffies);
665 }
666 if (mcast) {
667 init_completion(&mcast->done);
668 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
669 ipoib_mcast_join(dev, mcast);
670 }
671 spin_unlock_irq(&priv->lock);
672 }
673
674 int ipoib_mcast_start_thread(struct net_device *dev)
675 {
676 struct ipoib_dev_priv *priv = netdev_priv(dev);
677 unsigned long flags;
678
679 ipoib_dbg_mcast(priv, "starting multicast thread\n");
680
681 spin_lock_irqsave(&priv->lock, flags);
682 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
683 spin_unlock_irqrestore(&priv->lock, flags);
684
685 return 0;
686 }
687
688 int ipoib_mcast_stop_thread(struct net_device *dev)
689 {
690 struct ipoib_dev_priv *priv = netdev_priv(dev);
691 unsigned long flags;
692
693 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
694
695 spin_lock_irqsave(&priv->lock, flags);
696 cancel_delayed_work(&priv->mcast_task);
697 spin_unlock_irqrestore(&priv->lock, flags);
698
699 flush_workqueue(priv->wq);
700
701 return 0;
702 }
703
704 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
705 {
706 struct ipoib_dev_priv *priv = netdev_priv(dev);
707 int ret = 0;
708
709 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
710 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
711
712 if (!IS_ERR_OR_NULL(mcast->mc))
713 ib_sa_free_multicast(mcast->mc);
714
715 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
716 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
717 mcast->mcmember.mgid.raw);
718
719 /* Remove ourselves from the multicast group */
720 ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
721 be16_to_cpu(mcast->mcmember.mlid));
722 if (ret)
723 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
724 } else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
725 ipoib_dbg(priv, "leaving with no mcmember but not a "
726 "SENDONLY join\n");
727
728 return 0;
729 }
730
731 /*
732 * Check if the multicast group is sendonly. If so remove it from the maps
733 * and add to the remove list
734 */
735 void ipoib_check_and_add_mcast_sendonly(struct ipoib_dev_priv *priv, u8 *mgid,
736 struct list_head *remove_list)
737 {
738 /* Is this multicast ? */
739 if (*mgid == 0xff) {
740 struct ipoib_mcast *mcast = __ipoib_mcast_find(priv->dev, mgid);
741
742 if (mcast && test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
743 list_del(&mcast->list);
744 rb_erase(&mcast->rb_node, &priv->multicast_tree);
745 list_add_tail(&mcast->list, remove_list);
746 }
747 }
748 }
749
750 void ipoib_mcast_remove_list(struct list_head *remove_list)
751 {
752 struct ipoib_mcast *mcast, *tmcast;
753
754 list_for_each_entry_safe(mcast, tmcast, remove_list, list) {
755 ipoib_mcast_leave(mcast->dev, mcast);
756 ipoib_mcast_free(mcast);
757 }
758 }
759
760 void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
761 {
762 struct ipoib_dev_priv *priv = netdev_priv(dev);
763 struct ipoib_mcast *mcast;
764 unsigned long flags;
765 void *mgid = daddr + 4;
766
767 spin_lock_irqsave(&priv->lock, flags);
768
769 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) ||
770 !priv->broadcast ||
771 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
772 ++dev->stats.tx_dropped;
773 dev_kfree_skb_any(skb);
774 goto unlock;
775 }
776
777 mcast = __ipoib_mcast_find(dev, mgid);
778 if (!mcast || !mcast->ah) {
779 if (!mcast) {
780 /* Let's create a new send only group now */
781 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
782 mgid);
783
784 mcast = ipoib_mcast_alloc(dev, 0);
785 if (!mcast) {
786 ipoib_warn(priv, "unable to allocate memory "
787 "for multicast structure\n");
788 ++dev->stats.tx_dropped;
789 dev_kfree_skb_any(skb);
790 goto unlock;
791 }
792
793 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
794 memcpy(mcast->mcmember.mgid.raw, mgid,
795 sizeof (union ib_gid));
796 __ipoib_mcast_add(dev, mcast);
797 list_add_tail(&mcast->list, &priv->multicast_list);
798 }
799 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
800 skb_queue_tail(&mcast->pkt_queue, skb);
801 else {
802 ++dev->stats.tx_dropped;
803 dev_kfree_skb_any(skb);
804 }
805 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
806 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
807 }
808 } else {
809 struct ipoib_neigh *neigh;
810
811 spin_unlock_irqrestore(&priv->lock, flags);
812 neigh = ipoib_neigh_get(dev, daddr);
813 spin_lock_irqsave(&priv->lock, flags);
814 if (!neigh) {
815 neigh = ipoib_neigh_alloc(daddr, dev);
816 if (neigh) {
817 kref_get(&mcast->ah->ref);
818 neigh->ah = mcast->ah;
819 list_add_tail(&neigh->list, &mcast->neigh_list);
820 }
821 }
822 spin_unlock_irqrestore(&priv->lock, flags);
823 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
824 if (neigh)
825 ipoib_neigh_put(neigh);
826 return;
827 }
828
829 unlock:
830 spin_unlock_irqrestore(&priv->lock, flags);
831 }
832
833 void ipoib_mcast_dev_flush(struct net_device *dev)
834 {
835 struct ipoib_dev_priv *priv = netdev_priv(dev);
836 LIST_HEAD(remove_list);
837 struct ipoib_mcast *mcast, *tmcast;
838 unsigned long flags;
839
840 ipoib_dbg_mcast(priv, "flushing multicast list\n");
841
842 spin_lock_irqsave(&priv->lock, flags);
843
844 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
845 list_del(&mcast->list);
846 rb_erase(&mcast->rb_node, &priv->multicast_tree);
847 list_add_tail(&mcast->list, &remove_list);
848 }
849
850 if (priv->broadcast) {
851 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
852 list_add_tail(&priv->broadcast->list, &remove_list);
853 priv->broadcast = NULL;
854 }
855
856 spin_unlock_irqrestore(&priv->lock, flags);
857
858 /*
859 * make sure the in-flight joins have finished before we attempt
860 * to leave
861 */
862 list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
863 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
864 wait_for_completion(&mcast->done);
865
866 ipoib_mcast_remove_list(&remove_list);
867 }
868
869 static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
870 {
871 /* reserved QPN, prefix, scope */
872 if (memcmp(addr, broadcast, 6))
873 return 0;
874 /* signature lower, pkey */
875 if (memcmp(addr + 7, broadcast + 7, 3))
876 return 0;
877 return 1;
878 }
879
880 void ipoib_mcast_restart_task(struct work_struct *work)
881 {
882 struct ipoib_dev_priv *priv =
883 container_of(work, struct ipoib_dev_priv, restart_task);
884 struct net_device *dev = priv->dev;
885 struct netdev_hw_addr *ha;
886 struct ipoib_mcast *mcast, *tmcast;
887 LIST_HEAD(remove_list);
888 unsigned long flags;
889 struct ib_sa_mcmember_rec rec;
890
891 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
892 /*
893 * shortcut...on shutdown flush is called next, just
894 * let it do all the work
895 */
896 return;
897
898 ipoib_dbg_mcast(priv, "restarting multicast task\n");
899
900 local_irq_save(flags);
901 netif_addr_lock(dev);
902 spin_lock(&priv->lock);
903
904 /*
905 * Unfortunately, the networking core only gives us a list of all of
906 * the multicast hardware addresses. We need to figure out which ones
907 * are new and which ones have been removed
908 */
909
910 /* Clear out the found flag */
911 list_for_each_entry(mcast, &priv->multicast_list, list)
912 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
913
914 /* Mark all of the entries that are found or don't exist */
915 netdev_for_each_mc_addr(ha, dev) {
916 union ib_gid mgid;
917
918 if (!ipoib_mcast_addr_is_valid(ha->addr, dev->broadcast))
919 continue;
920
921 memcpy(mgid.raw, ha->addr + 4, sizeof mgid);
922
923 mcast = __ipoib_mcast_find(dev, &mgid);
924 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
925 struct ipoib_mcast *nmcast;
926
927 /* ignore group which is directly joined by userspace */
928 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
929 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
930 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
931 mgid.raw);
932 continue;
933 }
934
935 /* Not found or send-only group, let's add a new entry */
936 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
937 mgid.raw);
938
939 nmcast = ipoib_mcast_alloc(dev, 0);
940 if (!nmcast) {
941 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
942 continue;
943 }
944
945 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
946
947 nmcast->mcmember.mgid = mgid;
948
949 if (mcast) {
950 /* Destroy the send only entry */
951 list_move_tail(&mcast->list, &remove_list);
952
953 rb_replace_node(&mcast->rb_node,
954 &nmcast->rb_node,
955 &priv->multicast_tree);
956 } else
957 __ipoib_mcast_add(dev, nmcast);
958
959 list_add_tail(&nmcast->list, &priv->multicast_list);
960 }
961
962 if (mcast)
963 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
964 }
965
966 /* Remove all of the entries don't exist anymore */
967 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
968 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
969 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
970 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
971 mcast->mcmember.mgid.raw);
972
973 rb_erase(&mcast->rb_node, &priv->multicast_tree);
974
975 /* Move to the remove list */
976 list_move_tail(&mcast->list, &remove_list);
977 }
978 }
979
980 spin_unlock(&priv->lock);
981 netif_addr_unlock(dev);
982 local_irq_restore(flags);
983
984 /*
985 * make sure the in-flight joins have finished before we attempt
986 * to leave
987 */
988 list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
989 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
990 wait_for_completion(&mcast->done);
991
992 ipoib_mcast_remove_list(&remove_list);
993
994 /*
995 * Double check that we are still up
996 */
997 if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
998 spin_lock_irqsave(&priv->lock, flags);
999 __ipoib_mcast_schedule_join_thread(priv, NULL, 0);
1000 spin_unlock_irqrestore(&priv->lock, flags);
1001 }
1002 }
1003
1004 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
1005
1006 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
1007 {
1008 struct ipoib_mcast_iter *iter;
1009
1010 iter = kmalloc(sizeof *iter, GFP_KERNEL);
1011 if (!iter)
1012 return NULL;
1013
1014 iter->dev = dev;
1015 memset(iter->mgid.raw, 0, 16);
1016
1017 if (ipoib_mcast_iter_next(iter)) {
1018 kfree(iter);
1019 return NULL;
1020 }
1021
1022 return iter;
1023 }
1024
1025 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
1026 {
1027 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
1028 struct rb_node *n;
1029 struct ipoib_mcast *mcast;
1030 int ret = 1;
1031
1032 spin_lock_irq(&priv->lock);
1033
1034 n = rb_first(&priv->multicast_tree);
1035
1036 while (n) {
1037 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
1038
1039 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
1040 sizeof (union ib_gid)) < 0) {
1041 iter->mgid = mcast->mcmember.mgid;
1042 iter->created = mcast->created;
1043 iter->queuelen = skb_queue_len(&mcast->pkt_queue);
1044 iter->complete = !!mcast->ah;
1045 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
1046
1047 ret = 0;
1048
1049 break;
1050 }
1051
1052 n = rb_next(n);
1053 }
1054
1055 spin_unlock_irq(&priv->lock);
1056
1057 return ret;
1058 }
1059
1060 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
1061 union ib_gid *mgid,
1062 unsigned long *created,
1063 unsigned int *queuelen,
1064 unsigned int *complete,
1065 unsigned int *send_only)
1066 {
1067 *mgid = iter->mgid;
1068 *created = iter->created;
1069 *queuelen = iter->queuelen;
1070 *complete = iter->complete;
1071 *send_only = iter->send_only;
1072 }
1073
1074 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
Linux kernel - Deliverables
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