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IPoIB: Handle 4K IB MTU for UD (datagram) mode
[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 * $Id: ipoib_multicast.c 1362 2004-12-18 15:56:29Z roland $
35 */
36
37 #include <linux/skbuff.h>
38 #include <linux/rtnetlink.h>
39 #include <linux/ip.h>
40 #include <linux/in.h>
41 #include <linux/igmp.h>
42 #include <linux/inetdevice.h>
43 #include <linux/delay.h>
44 #include <linux/completion.h>
45
46 #include <net/dst.h>
47
48 #include "ipoib.h"
49
50 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
51 static int mcast_debug_level;
52
53 module_param(mcast_debug_level, int, 0644);
54 MODULE_PARM_DESC(mcast_debug_level,
55 "Enable multicast debug tracing if > 0");
56 #endif
57
58 static DEFINE_MUTEX(mcast_mutex);
59
60 struct ipoib_mcast_iter {
61 struct net_device *dev;
62 union ib_gid mgid;
63 unsigned long created;
64 unsigned int queuelen;
65 unsigned int complete;
66 unsigned int send_only;
67 };
68
69 static void ipoib_mcast_free(struct ipoib_mcast *mcast)
70 {
71 struct net_device *dev = mcast->dev;
72 struct ipoib_dev_priv *priv = netdev_priv(dev);
73 struct ipoib_neigh *neigh, *tmp;
74 unsigned long flags;
75 int tx_dropped = 0;
76
77 ipoib_dbg_mcast(netdev_priv(dev),
78 "deleting multicast group " IPOIB_GID_FMT "\n",
79 IPOIB_GID_ARG(mcast->mcmember.mgid));
80
81 spin_lock_irqsave(&priv->lock, flags);
82
83 list_for_each_entry_safe(neigh, tmp, &mcast->neigh_list, list) {
84 /*
85 * It's safe to call ipoib_put_ah() inside priv->lock
86 * here, because we know that mcast->ah will always
87 * hold one more reference, so ipoib_put_ah() will
88 * never do more than decrement the ref count.
89 */
90 if (neigh->ah)
91 ipoib_put_ah(neigh->ah);
92 ipoib_neigh_free(dev, neigh);
93 }
94
95 spin_unlock_irqrestore(&priv->lock, flags);
96
97 if (mcast->ah)
98 ipoib_put_ah(mcast->ah);
99
100 while (!skb_queue_empty(&mcast->pkt_queue)) {
101 ++tx_dropped;
102 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
103 }
104
105 spin_lock_irqsave(&priv->tx_lock, flags);
106 dev->stats.tx_dropped += tx_dropped;
107 spin_unlock_irqrestore(&priv->tx_lock, flags);
108
109 kfree(mcast);
110 }
111
112 static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev,
113 int can_sleep)
114 {
115 struct ipoib_mcast *mcast;
116
117 mcast = kzalloc(sizeof *mcast, can_sleep ? GFP_KERNEL : GFP_ATOMIC);
118 if (!mcast)
119 return NULL;
120
121 mcast->dev = dev;
122 mcast->created = jiffies;
123 mcast->backoff = 1;
124
125 INIT_LIST_HEAD(&mcast->list);
126 INIT_LIST_HEAD(&mcast->neigh_list);
127 skb_queue_head_init(&mcast->pkt_queue);
128
129 return mcast;
130 }
131
132 static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
133 {
134 struct ipoib_dev_priv *priv = netdev_priv(dev);
135 struct rb_node *n = priv->multicast_tree.rb_node;
136
137 while (n) {
138 struct ipoib_mcast *mcast;
139 int ret;
140
141 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
142
143 ret = memcmp(mgid, mcast->mcmember.mgid.raw,
144 sizeof (union ib_gid));
145 if (ret < 0)
146 n = n->rb_left;
147 else if (ret > 0)
148 n = n->rb_right;
149 else
150 return mcast;
151 }
152
153 return NULL;
154 }
155
156 static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
157 {
158 struct ipoib_dev_priv *priv = netdev_priv(dev);
159 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
160
161 while (*n) {
162 struct ipoib_mcast *tmcast;
163 int ret;
164
165 pn = *n;
166 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
167
168 ret = memcmp(mcast->mcmember.mgid.raw, tmcast->mcmember.mgid.raw,
169 sizeof (union ib_gid));
170 if (ret < 0)
171 n = &pn->rb_left;
172 else if (ret > 0)
173 n = &pn->rb_right;
174 else
175 return -EEXIST;
176 }
177
178 rb_link_node(&mcast->rb_node, pn, n);
179 rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
180
181 return 0;
182 }
183
184 static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
185 struct ib_sa_mcmember_rec *mcmember)
186 {
187 struct net_device *dev = mcast->dev;
188 struct ipoib_dev_priv *priv = netdev_priv(dev);
189 struct ipoib_ah *ah;
190 int ret;
191
192 mcast->mcmember = *mcmember;
193
194 /* Set the cached Q_Key before we attach if it's the broadcast group */
195 if (!memcmp(mcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
196 sizeof (union ib_gid))) {
197 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
198 priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
199 }
200
201 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
202 if (test_and_set_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
203 ipoib_warn(priv, "multicast group " IPOIB_GID_FMT
204 " already attached\n",
205 IPOIB_GID_ARG(mcast->mcmember.mgid));
206
207 return 0;
208 }
209
210 ret = ipoib_mcast_attach(dev, be16_to_cpu(mcast->mcmember.mlid),
211 &mcast->mcmember.mgid);
212 if (ret < 0) {
213 ipoib_warn(priv, "couldn't attach QP to multicast group "
214 IPOIB_GID_FMT "\n",
215 IPOIB_GID_ARG(mcast->mcmember.mgid));
216
217 clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags);
218 return ret;
219 }
220 }
221
222 {
223 struct ib_ah_attr av = {
224 .dlid = be16_to_cpu(mcast->mcmember.mlid),
225 .port_num = priv->port,
226 .sl = mcast->mcmember.sl,
227 .ah_flags = IB_AH_GRH,
228 .static_rate = mcast->mcmember.rate,
229 .grh = {
230 .flow_label = be32_to_cpu(mcast->mcmember.flow_label),
231 .hop_limit = mcast->mcmember.hop_limit,
232 .sgid_index = 0,
233 .traffic_class = mcast->mcmember.traffic_class
234 }
235 };
236 av.grh.dgid = mcast->mcmember.mgid;
237
238 ah = ipoib_create_ah(dev, priv->pd, &av);
239 if (!ah) {
240 ipoib_warn(priv, "ib_address_create failed\n");
241 } else {
242 spin_lock_irq(&priv->lock);
243 mcast->ah = ah;
244 spin_unlock_irq(&priv->lock);
245
246 ipoib_dbg_mcast(priv, "MGID " IPOIB_GID_FMT
247 " AV %p, LID 0x%04x, SL %d\n",
248 IPOIB_GID_ARG(mcast->mcmember.mgid),
249 mcast->ah->ah,
250 be16_to_cpu(mcast->mcmember.mlid),
251 mcast->mcmember.sl);
252 }
253 }
254
255 /* actually send any queued packets */
256 spin_lock_irq(&priv->tx_lock);
257 while (!skb_queue_empty(&mcast->pkt_queue)) {
258 struct sk_buff *skb = skb_dequeue(&mcast->pkt_queue);
259 spin_unlock_irq(&priv->tx_lock);
260
261 skb->dev = dev;
262
263 if (!skb->dst || !skb->dst->neighbour) {
264 /* put pseudoheader back on for next time */
265 skb_push(skb, sizeof (struct ipoib_pseudoheader));
266 }
267
268 if (dev_queue_xmit(skb))
269 ipoib_warn(priv, "dev_queue_xmit failed to requeue packet\n");
270 spin_lock_irq(&priv->tx_lock);
271 }
272 spin_unlock_irq(&priv->tx_lock);
273
274 return 0;
275 }
276
277 static int
278 ipoib_mcast_sendonly_join_complete(int status,
279 struct ib_sa_multicast *multicast)
280 {
281 struct ipoib_mcast *mcast = multicast->context;
282 struct net_device *dev = mcast->dev;
283 struct ipoib_dev_priv *priv = netdev_priv(dev);
284
285 /* We trap for port events ourselves. */
286 if (status == -ENETRESET)
287 return 0;
288
289 if (!status)
290 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
291
292 if (status) {
293 if (mcast->logcount++ < 20)
294 ipoib_dbg_mcast(netdev_priv(dev), "multicast join failed for "
295 IPOIB_GID_FMT ", status %d\n",
296 IPOIB_GID_ARG(mcast->mcmember.mgid), status);
297
298 /* Flush out any queued packets */
299 spin_lock_irq(&priv->tx_lock);
300 while (!skb_queue_empty(&mcast->pkt_queue)) {
301 ++dev->stats.tx_dropped;
302 dev_kfree_skb_any(skb_dequeue(&mcast->pkt_queue));
303 }
304 spin_unlock_irq(&priv->tx_lock);
305
306 /* Clear the busy flag so we try again */
307 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY,
308 &mcast->flags);
309 }
310 return status;
311 }
312
313 static int ipoib_mcast_sendonly_join(struct ipoib_mcast *mcast)
314 {
315 struct net_device *dev = mcast->dev;
316 struct ipoib_dev_priv *priv = netdev_priv(dev);
317 struct ib_sa_mcmember_rec rec = {
318 #if 0 /* Some SMs don't support send-only yet */
319 .join_state = 4
320 #else
321 .join_state = 1
322 #endif
323 };
324 int ret = 0;
325
326 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
327 ipoib_dbg_mcast(priv, "device shutting down, no multicast joins\n");
328 return -ENODEV;
329 }
330
331 if (test_and_set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
332 ipoib_dbg_mcast(priv, "multicast entry busy, skipping\n");
333 return -EBUSY;
334 }
335
336 rec.mgid = mcast->mcmember.mgid;
337 rec.port_gid = priv->local_gid;
338 rec.pkey = cpu_to_be16(priv->pkey);
339
340 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca,
341 priv->port, &rec,
342 IB_SA_MCMEMBER_REC_MGID |
343 IB_SA_MCMEMBER_REC_PORT_GID |
344 IB_SA_MCMEMBER_REC_PKEY |
345 IB_SA_MCMEMBER_REC_JOIN_STATE,
346 GFP_ATOMIC,
347 ipoib_mcast_sendonly_join_complete,
348 mcast);
349 if (IS_ERR(mcast->mc)) {
350 ret = PTR_ERR(mcast->mc);
351 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
352 ipoib_warn(priv, "ib_sa_join_multicast failed (ret = %d)\n",
353 ret);
354 } else {
355 ipoib_dbg_mcast(priv, "no multicast record for " IPOIB_GID_FMT
356 ", starting join\n",
357 IPOIB_GID_ARG(mcast->mcmember.mgid));
358 }
359
360 return ret;
361 }
362
363 static int ipoib_mcast_join_complete(int status,
364 struct ib_sa_multicast *multicast)
365 {
366 struct ipoib_mcast *mcast = multicast->context;
367 struct net_device *dev = mcast->dev;
368 struct ipoib_dev_priv *priv = netdev_priv(dev);
369
370 ipoib_dbg_mcast(priv, "join completion for " IPOIB_GID_FMT
371 " (status %d)\n",
372 IPOIB_GID_ARG(mcast->mcmember.mgid), status);
373
374 /* We trap for port events ourselves. */
375 if (status == -ENETRESET)
376 return 0;
377
378 if (!status)
379 status = ipoib_mcast_join_finish(mcast, &multicast->rec);
380
381 if (!status) {
382 mcast->backoff = 1;
383 mutex_lock(&mcast_mutex);
384 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
385 queue_delayed_work(ipoib_workqueue,
386 &priv->mcast_task, 0);
387 mutex_unlock(&mcast_mutex);
388
389 if (mcast == priv->broadcast)
390 netif_carrier_on(dev);
391
392 return 0;
393 }
394
395 if (mcast->logcount++ < 20) {
396 if (status == -ETIMEDOUT) {
397 ipoib_dbg_mcast(priv, "multicast join failed for " IPOIB_GID_FMT
398 ", status %d\n",
399 IPOIB_GID_ARG(mcast->mcmember.mgid),
400 status);
401 } else {
402 ipoib_warn(priv, "multicast join failed for "
403 IPOIB_GID_FMT ", status %d\n",
404 IPOIB_GID_ARG(mcast->mcmember.mgid),
405 status);
406 }
407 }
408
409 mcast->backoff *= 2;
410 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
411 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
412
413 /* Clear the busy flag so we try again */
414 status = test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
415
416 mutex_lock(&mcast_mutex);
417 spin_lock_irq(&priv->lock);
418 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
419 queue_delayed_work(ipoib_workqueue, &priv->mcast_task,
420 mcast->backoff * HZ);
421 spin_unlock_irq(&priv->lock);
422 mutex_unlock(&mcast_mutex);
423
424 return status;
425 }
426
427 static void ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast,
428 int create)
429 {
430 struct ipoib_dev_priv *priv = netdev_priv(dev);
431 struct ib_sa_mcmember_rec rec = {
432 .join_state = 1
433 };
434 ib_sa_comp_mask comp_mask;
435 int ret = 0;
436
437 ipoib_dbg_mcast(priv, "joining MGID " IPOIB_GID_FMT "\n",
438 IPOIB_GID_ARG(mcast->mcmember.mgid));
439
440 rec.mgid = mcast->mcmember.mgid;
441 rec.port_gid = priv->local_gid;
442 rec.pkey = cpu_to_be16(priv->pkey);
443
444 comp_mask =
445 IB_SA_MCMEMBER_REC_MGID |
446 IB_SA_MCMEMBER_REC_PORT_GID |
447 IB_SA_MCMEMBER_REC_PKEY |
448 IB_SA_MCMEMBER_REC_JOIN_STATE;
449
450 if (create) {
451 comp_mask |=
452 IB_SA_MCMEMBER_REC_QKEY |
453 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
454 IB_SA_MCMEMBER_REC_MTU |
455 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |
456 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
457 IB_SA_MCMEMBER_REC_RATE |
458 IB_SA_MCMEMBER_REC_SL |
459 IB_SA_MCMEMBER_REC_FLOW_LABEL |
460 IB_SA_MCMEMBER_REC_HOP_LIMIT;
461
462 rec.qkey = priv->broadcast->mcmember.qkey;
463 rec.mtu_selector = IB_SA_EQ;
464 rec.mtu = priv->broadcast->mcmember.mtu;
465 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
466 rec.rate_selector = IB_SA_EQ;
467 rec.rate = priv->broadcast->mcmember.rate;
468 rec.sl = priv->broadcast->mcmember.sl;
469 rec.flow_label = priv->broadcast->mcmember.flow_label;
470 rec.hop_limit = priv->broadcast->mcmember.hop_limit;
471 }
472
473 set_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
474 mcast->mc = ib_sa_join_multicast(&ipoib_sa_client, priv->ca, priv->port,
475 &rec, comp_mask, GFP_KERNEL,
476 ipoib_mcast_join_complete, mcast);
477 if (IS_ERR(mcast->mc)) {
478 clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags);
479 ret = PTR_ERR(mcast->mc);
480 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
481
482 mcast->backoff *= 2;
483 if (mcast->backoff > IPOIB_MAX_BACKOFF_SECONDS)
484 mcast->backoff = IPOIB_MAX_BACKOFF_SECONDS;
485
486 mutex_lock(&mcast_mutex);
487 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
488 queue_delayed_work(ipoib_workqueue,
489 &priv->mcast_task,
490 mcast->backoff * HZ);
491 mutex_unlock(&mcast_mutex);
492 }
493 }
494
495 void ipoib_mcast_join_task(struct work_struct *work)
496 {
497 struct ipoib_dev_priv *priv =
498 container_of(work, struct ipoib_dev_priv, mcast_task.work);
499 struct net_device *dev = priv->dev;
500
501 if (!test_bit(IPOIB_MCAST_RUN, &priv->flags))
502 return;
503
504 if (ib_query_gid(priv->ca, priv->port, 0, &priv->local_gid))
505 ipoib_warn(priv, "ib_query_gid() failed\n");
506 else
507 memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw, sizeof (union ib_gid));
508
509 {
510 struct ib_port_attr attr;
511
512 if (!ib_query_port(priv->ca, priv->port, &attr))
513 priv->local_lid = attr.lid;
514 else
515 ipoib_warn(priv, "ib_query_port failed\n");
516 }
517
518 if (!priv->broadcast) {
519 struct ipoib_mcast *broadcast;
520
521 broadcast = ipoib_mcast_alloc(dev, 1);
522 if (!broadcast) {
523 ipoib_warn(priv, "failed to allocate broadcast group\n");
524 mutex_lock(&mcast_mutex);
525 if (test_bit(IPOIB_MCAST_RUN, &priv->flags))
526 queue_delayed_work(ipoib_workqueue,
527 &priv->mcast_task, HZ);
528 mutex_unlock(&mcast_mutex);
529 return;
530 }
531
532 spin_lock_irq(&priv->lock);
533 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
534 sizeof (union ib_gid));
535 priv->broadcast = broadcast;
536
537 __ipoib_mcast_add(dev, priv->broadcast);
538 spin_unlock_irq(&priv->lock);
539 }
540
541 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
542 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags))
543 ipoib_mcast_join(dev, priv->broadcast, 0);
544 return;
545 }
546
547 while (1) {
548 struct ipoib_mcast *mcast = NULL;
549
550 spin_lock_irq(&priv->lock);
551 list_for_each_entry(mcast, &priv->multicast_list, list) {
552 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)
553 && !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)
554 && !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
555 /* Found the next unjoined group */
556 break;
557 }
558 }
559 spin_unlock_irq(&priv->lock);
560
561 if (&mcast->list == &priv->multicast_list) {
562 /* All done */
563 break;
564 }
565
566 ipoib_mcast_join(dev, mcast, 1);
567 return;
568 }
569
570 priv->mcast_mtu = IPOIB_UD_MTU(ib_mtu_enum_to_int(priv->broadcast->mcmember.mtu));
571
572 if (!ipoib_cm_admin_enabled(dev))
573 dev->mtu = min(priv->mcast_mtu, priv->admin_mtu);
574
575 ipoib_dbg_mcast(priv, "successfully joined all multicast groups\n");
576
577 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
578 }
579
580 int ipoib_mcast_start_thread(struct net_device *dev)
581 {
582 struct ipoib_dev_priv *priv = netdev_priv(dev);
583
584 ipoib_dbg_mcast(priv, "starting multicast thread\n");
585
586 mutex_lock(&mcast_mutex);
587 if (!test_and_set_bit(IPOIB_MCAST_RUN, &priv->flags))
588 queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
589 mutex_unlock(&mcast_mutex);
590
591 spin_lock_irq(&priv->lock);
592 set_bit(IPOIB_MCAST_STARTED, &priv->flags);
593 spin_unlock_irq(&priv->lock);
594
595 return 0;
596 }
597
598 int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
599 {
600 struct ipoib_dev_priv *priv = netdev_priv(dev);
601
602 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
603
604 spin_lock_irq(&priv->lock);
605 clear_bit(IPOIB_MCAST_STARTED, &priv->flags);
606 spin_unlock_irq(&priv->lock);
607
608 mutex_lock(&mcast_mutex);
609 clear_bit(IPOIB_MCAST_RUN, &priv->flags);
610 cancel_delayed_work(&priv->mcast_task);
611 mutex_unlock(&mcast_mutex);
612
613 if (flush)
614 flush_workqueue(ipoib_workqueue);
615
616 return 0;
617 }
618
619 static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
620 {
621 struct ipoib_dev_priv *priv = netdev_priv(dev);
622 int ret = 0;
623
624 if (test_and_clear_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
625 ib_sa_free_multicast(mcast->mc);
626
627 if (test_and_clear_bit(IPOIB_MCAST_FLAG_ATTACHED, &mcast->flags)) {
628 ipoib_dbg_mcast(priv, "leaving MGID " IPOIB_GID_FMT "\n",
629 IPOIB_GID_ARG(mcast->mcmember.mgid));
630
631 /* Remove ourselves from the multicast group */
632 ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
633 &mcast->mcmember.mgid);
634 if (ret)
635 ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
636 }
637
638 return 0;
639 }
640
641 void ipoib_mcast_send(struct net_device *dev, void *mgid, struct sk_buff *skb)
642 {
643 struct ipoib_dev_priv *priv = netdev_priv(dev);
644 struct ipoib_mcast *mcast;
645
646 /*
647 * We can only be called from ipoib_start_xmit, so we're
648 * inside tx_lock -- no need to save/restore flags.
649 */
650 spin_lock(&priv->lock);
651
652 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) ||
653 !priv->broadcast ||
654 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
655 ++dev->stats.tx_dropped;
656 dev_kfree_skb_any(skb);
657 goto unlock;
658 }
659
660 mcast = __ipoib_mcast_find(dev, mgid);
661 if (!mcast) {
662 /* Let's create a new send only group now */
663 ipoib_dbg_mcast(priv, "setting up send only multicast group for "
664 IPOIB_GID_FMT "\n", IPOIB_GID_RAW_ARG(mgid));
665
666 mcast = ipoib_mcast_alloc(dev, 0);
667 if (!mcast) {
668 ipoib_warn(priv, "unable to allocate memory for "
669 "multicast structure\n");
670 ++dev->stats.tx_dropped;
671 dev_kfree_skb_any(skb);
672 goto out;
673 }
674
675 set_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags);
676 memcpy(mcast->mcmember.mgid.raw, mgid, sizeof (union ib_gid));
677 __ipoib_mcast_add(dev, mcast);
678 list_add_tail(&mcast->list, &priv->multicast_list);
679 }
680
681 if (!mcast->ah) {
682 if (skb_queue_len(&mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE)
683 skb_queue_tail(&mcast->pkt_queue, skb);
684 else {
685 ++dev->stats.tx_dropped;
686 dev_kfree_skb_any(skb);
687 }
688
689 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
690 ipoib_dbg_mcast(priv, "no address vector, "
691 "but multicast join already started\n");
692 else if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
693 ipoib_mcast_sendonly_join(mcast);
694
695 /*
696 * If lookup completes between here and out:, don't
697 * want to send packet twice.
698 */
699 mcast = NULL;
700 }
701
702 out:
703 if (mcast && mcast->ah) {
704 if (skb->dst &&
705 skb->dst->neighbour &&
706 !*to_ipoib_neigh(skb->dst->neighbour)) {
707 struct ipoib_neigh *neigh = ipoib_neigh_alloc(skb->dst->neighbour,
708 skb->dev);
709
710 if (neigh) {
711 kref_get(&mcast->ah->ref);
712 neigh->ah = mcast->ah;
713 list_add_tail(&neigh->list, &mcast->neigh_list);
714 }
715 }
716
717 ipoib_send(dev, skb, mcast->ah, IB_MULTICAST_QPN);
718 }
719
720 unlock:
721 spin_unlock(&priv->lock);
722 }
723
724 void ipoib_mcast_dev_flush(struct net_device *dev)
725 {
726 struct ipoib_dev_priv *priv = netdev_priv(dev);
727 LIST_HEAD(remove_list);
728 struct ipoib_mcast *mcast, *tmcast;
729 unsigned long flags;
730
731 ipoib_dbg_mcast(priv, "flushing multicast list\n");
732
733 spin_lock_irqsave(&priv->lock, flags);
734
735 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
736 list_del(&mcast->list);
737 rb_erase(&mcast->rb_node, &priv->multicast_tree);
738 list_add_tail(&mcast->list, &remove_list);
739 }
740
741 if (priv->broadcast) {
742 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
743 list_add_tail(&priv->broadcast->list, &remove_list);
744 priv->broadcast = NULL;
745 }
746
747 spin_unlock_irqrestore(&priv->lock, flags);
748
749 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
750 ipoib_mcast_leave(dev, mcast);
751 ipoib_mcast_free(mcast);
752 }
753 }
754
755 void ipoib_mcast_restart_task(struct work_struct *work)
756 {
757 struct ipoib_dev_priv *priv =
758 container_of(work, struct ipoib_dev_priv, restart_task);
759 struct net_device *dev = priv->dev;
760 struct dev_mc_list *mclist;
761 struct ipoib_mcast *mcast, *tmcast;
762 LIST_HEAD(remove_list);
763 unsigned long flags;
764 struct ib_sa_mcmember_rec rec;
765
766 ipoib_dbg_mcast(priv, "restarting multicast task\n");
767
768 ipoib_mcast_stop_thread(dev, 0);
769
770 local_irq_save(flags);
771 netif_tx_lock(dev);
772 spin_lock(&priv->lock);
773
774 /*
775 * Unfortunately, the networking core only gives us a list of all of
776 * the multicast hardware addresses. We need to figure out which ones
777 * are new and which ones have been removed
778 */
779
780 /* Clear out the found flag */
781 list_for_each_entry(mcast, &priv->multicast_list, list)
782 clear_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
783
784 /* Mark all of the entries that are found or don't exist */
785 for (mclist = dev->mc_list; mclist; mclist = mclist->next) {
786 union ib_gid mgid;
787
788 memcpy(mgid.raw, mclist->dmi_addr + 4, sizeof mgid);
789
790 mcast = __ipoib_mcast_find(dev, &mgid);
791 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
792 struct ipoib_mcast *nmcast;
793
794 /* ignore group which is directly joined by userspace */
795 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
796 !ib_sa_get_mcmember_rec(priv->ca, priv->port, &mgid, &rec)) {
797 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid "
798 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
799 continue;
800 }
801
802 /* Not found or send-only group, let's add a new entry */
803 ipoib_dbg_mcast(priv, "adding multicast entry for mgid "
804 IPOIB_GID_FMT "\n", IPOIB_GID_ARG(mgid));
805
806 nmcast = ipoib_mcast_alloc(dev, 0);
807 if (!nmcast) {
808 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
809 continue;
810 }
811
812 set_bit(IPOIB_MCAST_FLAG_FOUND, &nmcast->flags);
813
814 nmcast->mcmember.mgid = mgid;
815
816 if (mcast) {
817 /* Destroy the send only entry */
818 list_move_tail(&mcast->list, &remove_list);
819
820 rb_replace_node(&mcast->rb_node,
821 &nmcast->rb_node,
822 &priv->multicast_tree);
823 } else
824 __ipoib_mcast_add(dev, nmcast);
825
826 list_add_tail(&nmcast->list, &priv->multicast_list);
827 }
828
829 if (mcast)
830 set_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags);
831 }
832
833 /* Remove all of the entries don't exist anymore */
834 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
835 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
836 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
837 ipoib_dbg_mcast(priv, "deleting multicast group " IPOIB_GID_FMT "\n",
838 IPOIB_GID_ARG(mcast->mcmember.mgid));
839
840 rb_erase(&mcast->rb_node, &priv->multicast_tree);
841
842 /* Move to the remove list */
843 list_move_tail(&mcast->list, &remove_list);
844 }
845 }
846
847 spin_unlock(&priv->lock);
848 netif_tx_unlock(dev);
849 local_irq_restore(flags);
850
851 /* We have to cancel outside of the spinlock */
852 list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
853 ipoib_mcast_leave(mcast->dev, mcast);
854 ipoib_mcast_free(mcast);
855 }
856
857 if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
858 ipoib_mcast_start_thread(dev);
859 }
860
861 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
862
863 struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
864 {
865 struct ipoib_mcast_iter *iter;
866
867 iter = kmalloc(sizeof *iter, GFP_KERNEL);
868 if (!iter)
869 return NULL;
870
871 iter->dev = dev;
872 memset(iter->mgid.raw, 0, 16);
873
874 if (ipoib_mcast_iter_next(iter)) {
875 kfree(iter);
876 return NULL;
877 }
878
879 return iter;
880 }
881
882 int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
883 {
884 struct ipoib_dev_priv *priv = netdev_priv(iter->dev);
885 struct rb_node *n;
886 struct ipoib_mcast *mcast;
887 int ret = 1;
888
889 spin_lock_irq(&priv->lock);
890
891 n = rb_first(&priv->multicast_tree);
892
893 while (n) {
894 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
895
896 if (memcmp(iter->mgid.raw, mcast->mcmember.mgid.raw,
897 sizeof (union ib_gid)) < 0) {
898 iter->mgid = mcast->mcmember.mgid;
899 iter->created = mcast->created;
900 iter->queuelen = skb_queue_len(&mcast->pkt_queue);
901 iter->complete = !!mcast->ah;
902 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
903
904 ret = 0;
905
906 break;
907 }
908
909 n = rb_next(n);
910 }
911
912 spin_unlock_irq(&priv->lock);
913
914 return ret;
915 }
916
917 void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
918 union ib_gid *mgid,
919 unsigned long *created,
920 unsigned int *queuelen,
921 unsigned int *complete,
922 unsigned int *send_only)
923 {
924 *mgid = iter->mgid;
925 *created = iter->created;
926 *queuelen = iter->queuelen;
927 *complete = iter->complete;
928 *send_only = iter->send_only;
929 }
930
931 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
Linux kernel - Deliverables
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