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