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
51static int mcast_debug_level;
52
53module_param(mcast_debug_level, int, 0644);
54MODULE_PARM_DESC(mcast_debug_level,
55 "Enable multicast debug tracing if > 0");
56#endif
57
58struct 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 */
73static 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(dwork: &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(wq: priv->wq, dwork: &priv->mcast_task, delay: 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(wq: priv->wq, dwork: &priv->mcast_task, HZ);
108 } else
109 queue_delayed_work(wq: priv->wq, dwork: &priv->mcast_task, delay: 0);
110}
111
112static 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(ipoib_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, gid: mcast->mcmember.mgid.raw);
122
123 if (mcast->ah)
124 ipoib_put_ah(ah: mcast->ah);
125
126 while (!skb_queue_empty(list: &mcast->pkt_queue)) {
127 ++tx_dropped;
128 dev_kfree_skb_any(skb: skb_dequeue(list: &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(objp: mcast);
136}
137
138static struct ipoib_mcast *ipoib_mcast_alloc(struct net_device *dev)
139{
140 struct ipoib_mcast *mcast;
141
142 mcast = kzalloc(sizeof(*mcast), GFP_ATOMIC);
143 if (!mcast)
144 return NULL;
145
146 mcast->dev = dev;
147 mcast->created = jiffies;
148 mcast->delay_until = jiffies;
149 mcast->backoff = 1;
150
151 INIT_LIST_HEAD(list: &mcast->list);
152 INIT_LIST_HEAD(list: &mcast->neigh_list);
153 skb_queue_head_init(list: &mcast->pkt_queue);
154
155 return mcast;
156}
157
158static struct ipoib_mcast *__ipoib_mcast_find(struct net_device *dev, void *mgid)
159{
160 struct ipoib_dev_priv *priv = ipoib_priv(dev);
161 struct rb_node *n = priv->multicast_tree.rb_node;
162
163 while (n) {
164 struct ipoib_mcast *mcast;
165 int ret;
166
167 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
168
169 ret = memcmp(p: mgid, q: mcast->mcmember.mgid.raw,
170 size: sizeof (union ib_gid));
171 if (ret < 0)
172 n = n->rb_left;
173 else if (ret > 0)
174 n = n->rb_right;
175 else
176 return mcast;
177 }
178
179 return NULL;
180}
181
182static int __ipoib_mcast_add(struct net_device *dev, struct ipoib_mcast *mcast)
183{
184 struct ipoib_dev_priv *priv = ipoib_priv(dev);
185 struct rb_node **n = &priv->multicast_tree.rb_node, *pn = NULL;
186
187 while (*n) {
188 struct ipoib_mcast *tmcast;
189 int ret;
190
191 pn = *n;
192 tmcast = rb_entry(pn, struct ipoib_mcast, rb_node);
193
194 ret = memcmp(p: mcast->mcmember.mgid.raw, q: tmcast->mcmember.mgid.raw,
195 size: sizeof (union ib_gid));
196 if (ret < 0)
197 n = &pn->rb_left;
198 else if (ret > 0)
199 n = &pn->rb_right;
200 else
201 return -EEXIST;
202 }
203
204 rb_link_node(node: &mcast->rb_node, parent: pn, rb_link: n);
205 rb_insert_color(&mcast->rb_node, &priv->multicast_tree);
206
207 return 0;
208}
209
210static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
211 struct ib_sa_mcmember_rec *mcmember)
212{
213 struct net_device *dev = mcast->dev;
214 struct ipoib_dev_priv *priv = ipoib_priv(dev);
215 struct rdma_netdev *rn = netdev_priv(dev);
216 struct ipoib_ah *ah;
217 struct rdma_ah_attr av;
218 int ret;
219 int set_qkey = 0;
220 int mtu;
221
222 mcast->mcmember = *mcmember;
223
224 /* Set the multicast MTU and cached Q_Key before we attach if it's
225 * the broadcast group.
226 */
227 if (!memcmp(p: mcast->mcmember.mgid.raw, q: priv->dev->broadcast + 4,
228 size: sizeof (union ib_gid))) {
229 spin_lock_irq(lock: &priv->lock);
230 if (!priv->broadcast) {
231 spin_unlock_irq(lock: &priv->lock);
232 return -EAGAIN;
233 }
234 /*update priv member according to the new mcast*/
235 priv->broadcast->mcmember.qkey = mcmember->qkey;
236 priv->broadcast->mcmember.mtu = mcmember->mtu;
237 priv->broadcast->mcmember.traffic_class = mcmember->traffic_class;
238 priv->broadcast->mcmember.rate = mcmember->rate;
239 priv->broadcast->mcmember.sl = mcmember->sl;
240 priv->broadcast->mcmember.flow_label = mcmember->flow_label;
241 priv->broadcast->mcmember.hop_limit = mcmember->hop_limit;
242 /* assume if the admin and the mcast are the same both can be changed */
243 mtu = rdma_mtu_enum_to_int(device: priv->ca, port: priv->port,
244 mtu: priv->broadcast->mcmember.mtu);
245 if (priv->mcast_mtu == priv->admin_mtu)
246 priv->admin_mtu = IPOIB_UD_MTU(mtu);
247 priv->mcast_mtu = IPOIB_UD_MTU(mtu);
248 rn->mtu = priv->mcast_mtu;
249
250 priv->qkey = be32_to_cpu(priv->broadcast->mcmember.qkey);
251 spin_unlock_irq(lock: &priv->lock);
252 priv->tx_wr.remote_qkey = priv->qkey;
253 set_qkey = 1;
254 }
255
256 if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
257 if (test_and_set_bit(nr: IPOIB_MCAST_FLAG_ATTACHED, addr: &mcast->flags)) {
258 ipoib_warn(priv, "multicast group %pI6 already attached\n",
259 mcast->mcmember.mgid.raw);
260
261 return 0;
262 }
263
264 ret = rn->attach_mcast(dev, priv->ca, &mcast->mcmember.mgid,
265 be16_to_cpu(mcast->mcmember.mlid),
266 set_qkey, priv->qkey);
267 if (ret < 0) {
268 ipoib_warn(priv, "couldn't attach QP to multicast group %pI6\n",
269 mcast->mcmember.mgid.raw);
270
271 clear_bit(nr: IPOIB_MCAST_FLAG_ATTACHED, addr: &mcast->flags);
272 return ret;
273 }
274 }
275
276 memset(&av, 0, sizeof(av));
277 av.type = rdma_ah_find_type(dev: priv->ca, port_num: priv->port);
278 rdma_ah_set_dlid(attr: &av, be16_to_cpu(mcast->mcmember.mlid));
279 rdma_ah_set_port_num(attr: &av, port_num: priv->port);
280 rdma_ah_set_sl(attr: &av, sl: mcast->mcmember.sl);
281 rdma_ah_set_static_rate(attr: &av, static_rate: mcast->mcmember.rate);
282
283 rdma_ah_set_grh(attr: &av, dgid: &mcast->mcmember.mgid,
284 be32_to_cpu(mcast->mcmember.flow_label),
285 sgid_index: 0, hop_limit: mcast->mcmember.hop_limit,
286 traffic_class: mcast->mcmember.traffic_class);
287
288 ah = ipoib_create_ah(dev, pd: priv->pd, attr: &av);
289 if (IS_ERR(ptr: ah)) {
290 ipoib_warn(priv, "ib_address_create failed %pe\n", ah);
291 /* use original error */
292 return PTR_ERR(ptr: ah);
293 }
294 spin_lock_irq(lock: &priv->lock);
295 mcast->ah = ah;
296 spin_unlock_irq(lock: &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 /* actually send any queued packets */
305 netif_tx_lock_bh(dev);
306 while (!skb_queue_empty(list: &mcast->pkt_queue)) {
307 struct sk_buff *skb = skb_dequeue(list: &mcast->pkt_queue);
308
309 netif_tx_unlock_bh(dev);
310
311 skb->dev = dev;
312
313 ret = dev_queue_xmit(skb);
314 if (ret)
315 ipoib_warn(priv, "%s:dev_queue_xmit failed to re-queue packet, ret:%d\n",
316 __func__, ret);
317 netif_tx_lock_bh(dev);
318 }
319 netif_tx_unlock_bh(dev);
320
321 return 0;
322}
323
324void 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(device: priv->ca, port_num: priv->port, port_attr: &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 * Take rtnl_lock to avoid racing with ipoib_stop() and
337 * turning the carrier back on while a device is being
338 * removed. However, ipoib_stop() will attempt to flush
339 * the workqueue while holding the rtnl lock, so loop
340 * on trylock until either we get the lock or we see
341 * FLAG_OPER_UP go away as that signals that we are bailing
342 * and can safely ignore the carrier on work.
343 */
344 while (!rtnl_trylock()) {
345 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
346 return;
347 else
348 msleep(msecs: 20);
349 }
350 if (!ipoib_cm_admin_enabled(dev: priv->dev))
351 dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
352 netif_carrier_on(dev: priv->dev);
353 rtnl_unlock();
354}
355
356static int ipoib_mcast_join_complete(int status,
357 struct ib_sa_multicast *multicast)
358{
359 struct ipoib_mcast *mcast = multicast->context;
360 struct net_device *dev = mcast->dev;
361 struct ipoib_dev_priv *priv = ipoib_priv(dev);
362
363 ipoib_dbg_mcast(priv, "%sjoin completion for %pI6 (status %d)\n",
364 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ?
365 "sendonly " : "",
366 mcast->mcmember.mgid.raw, status);
367
368 /* We trap for port events ourselves. */
369 if (status == -ENETRESET) {
370 status = 0;
371 goto out;
372 }
373
374 if (!status)
375 status = ipoib_mcast_join_finish(mcast, mcmember: &multicast->rec);
376
377 if (!status) {
378 mcast->backoff = 1;
379 mcast->delay_until = jiffies;
380
381 /*
382 * Defer carrier on work to priv->wq to avoid a
383 * deadlock on rtnl_lock here. Requeue our multicast
384 * work too, which will end up happening right after
385 * our carrier on task work and will allow us to
386 * send out all of the non-broadcast joins
387 */
388 if (mcast == priv->broadcast) {
389 spin_lock_irq(lock: &priv->lock);
390 queue_work(wq: priv->wq, work: &priv->carrier_on_task);
391 __ipoib_mcast_schedule_join_thread(priv, NULL, delay: 0);
392 goto out_locked;
393 }
394 } else {
395 bool silent_fail =
396 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
397 status == -EINVAL;
398
399 if (mcast->logcount < 20) {
400 if (status == -ETIMEDOUT || status == -EAGAIN ||
401 silent_fail) {
402 ipoib_dbg_mcast(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 } else {
406 ipoib_warn(priv, "%smulticast join failed for %pI6, status %d\n",
407 test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ? "sendonly " : "",
408 mcast->mcmember.mgid.raw, status);
409 }
410
411 if (!silent_fail)
412 mcast->logcount++;
413 }
414
415 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) &&
416 mcast->backoff >= 2) {
417 /*
418 * We only retry sendonly joins once before we drop
419 * the packet and quit trying to deal with the
420 * group. However, we leave the group in the
421 * mcast list as an unjoined group. If we want to
422 * try joining again, we simply queue up a packet
423 * and restart the join thread. The empty queue
424 * is why the join thread ignores this group.
425 */
426 mcast->backoff = 1;
427 netif_tx_lock_bh(dev);
428 while (!skb_queue_empty(list: &mcast->pkt_queue)) {
429 ++dev->stats.tx_dropped;
430 dev_kfree_skb_any(skb: skb_dequeue(list: &mcast->pkt_queue));
431 }
432 netif_tx_unlock_bh(dev);
433 } else {
434 spin_lock_irq(lock: &priv->lock);
435 /* Requeue this join task with a backoff delay */
436 __ipoib_mcast_schedule_join_thread(priv, mcast, delay: 1);
437 goto out_locked;
438 }
439 }
440out:
441 spin_lock_irq(lock: &priv->lock);
442out_locked:
443 /*
444 * Make sure to set mcast->mc before we clear the busy flag to avoid
445 * racing with code that checks for BUSY before checking mcast->mc
446 */
447 if (status)
448 mcast->mc = NULL;
449 else
450 mcast->mc = multicast;
451 clear_bit(nr: IPOIB_MCAST_FLAG_BUSY, addr: &mcast->flags);
452 spin_unlock_irq(lock: &priv->lock);
453 complete(&mcast->done);
454
455 return status;
456}
457
458/*
459 * Caller must hold 'priv->lock'
460 */
461static int ipoib_mcast_join(struct net_device *dev, struct ipoib_mcast *mcast)
462{
463 struct ipoib_dev_priv *priv = ipoib_priv(dev);
464 struct ib_sa_multicast *multicast;
465 struct ib_sa_mcmember_rec rec = {
466 .join_state = 1
467 };
468 ib_sa_comp_mask comp_mask;
469 int ret = 0;
470
471 if (!priv->broadcast ||
472 !test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
473 return -EINVAL;
474
475 init_completion(x: &mcast->done);
476 set_bit(nr: IPOIB_MCAST_FLAG_BUSY, addr: &mcast->flags);
477
478 ipoib_dbg_mcast(priv, "joining MGID %pI6\n", mcast->mcmember.mgid.raw);
479
480 rec.mgid = mcast->mcmember.mgid;
481 rec.port_gid = priv->local_gid;
482 rec.pkey = cpu_to_be16(priv->pkey);
483
484 comp_mask =
485 IB_SA_MCMEMBER_REC_MGID |
486 IB_SA_MCMEMBER_REC_PORT_GID |
487 IB_SA_MCMEMBER_REC_PKEY |
488 IB_SA_MCMEMBER_REC_JOIN_STATE;
489
490 if (mcast != priv->broadcast) {
491 /*
492 * RFC 4391:
493 * The MGID MUST use the same P_Key, Q_Key, SL, MTU,
494 * and HopLimit as those used in the broadcast-GID. The rest
495 * of attributes SHOULD follow the values used in the
496 * broadcast-GID as well.
497 */
498 comp_mask |=
499 IB_SA_MCMEMBER_REC_QKEY |
500 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
501 IB_SA_MCMEMBER_REC_MTU |
502 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS |
503 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
504 IB_SA_MCMEMBER_REC_RATE |
505 IB_SA_MCMEMBER_REC_SL |
506 IB_SA_MCMEMBER_REC_FLOW_LABEL |
507 IB_SA_MCMEMBER_REC_HOP_LIMIT;
508
509 rec.qkey = priv->broadcast->mcmember.qkey;
510 rec.mtu_selector = IB_SA_EQ;
511 rec.mtu = priv->broadcast->mcmember.mtu;
512 rec.traffic_class = priv->broadcast->mcmember.traffic_class;
513 rec.rate_selector = IB_SA_EQ;
514 rec.rate = priv->broadcast->mcmember.rate;
515 rec.sl = priv->broadcast->mcmember.sl;
516 rec.flow_label = priv->broadcast->mcmember.flow_label;
517 rec.hop_limit = priv->broadcast->mcmember.hop_limit;
518
519 /*
520 * Send-only IB Multicast joins work at the core IB layer but
521 * require specific SM support.
522 * We can use such joins here only if the current SM supports that feature.
523 * However, if not, we emulate an Ethernet multicast send,
524 * which does not require a multicast subscription and will
525 * still send properly. The most appropriate thing to
526 * do is to create the group if it doesn't exist as that
527 * most closely emulates the behavior, from a user space
528 * application perspective, of Ethernet multicast operation.
529 */
530 if (test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
531 rec.join_state = SENDONLY_FULLMEMBER_JOIN;
532 }
533
534 multicast = ib_sa_join_multicast(client: &ipoib_sa_client, device: priv->ca, port_num: priv->port,
535 rec: &rec, comp_mask, GFP_ATOMIC,
536 callback: ipoib_mcast_join_complete, context: mcast);
537 if (IS_ERR(ptr: multicast)) {
538 ret = PTR_ERR(ptr: multicast);
539 ipoib_warn(priv, "ib_sa_join_multicast failed, status %d\n", ret);
540 /* Requeue this join task with a backoff delay */
541 __ipoib_mcast_schedule_join_thread(priv, mcast, delay: 1);
542 clear_bit(nr: IPOIB_MCAST_FLAG_BUSY, addr: &mcast->flags);
543 complete(&mcast->done);
544 return ret;
545 }
546 return 0;
547}
548
549void ipoib_mcast_join_task(struct work_struct *work)
550{
551 struct ipoib_dev_priv *priv =
552 container_of(work, struct ipoib_dev_priv, mcast_task.work);
553 struct net_device *dev = priv->dev;
554 struct ib_port_attr port_attr;
555 unsigned long delay_until = 0;
556 struct ipoib_mcast *mcast = NULL;
557
558 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
559 return;
560
561 if (ib_query_port(device: priv->ca, port_num: priv->port, port_attr: &port_attr)) {
562 ipoib_dbg(priv, "ib_query_port() failed\n");
563 return;
564 }
565 if (port_attr.state != IB_PORT_ACTIVE) {
566 ipoib_dbg(priv, "port state is not ACTIVE (state = %d) suspending join task\n",
567 port_attr.state);
568 return;
569 }
570 priv->local_lid = port_attr.lid;
571 netif_addr_lock_bh(dev);
572
573 if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
574 netif_addr_unlock_bh(dev);
575 return;
576 }
577 netif_addr_unlock_bh(dev);
578
579 spin_lock_irq(lock: &priv->lock);
580 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
581 goto out;
582
583 if (!priv->broadcast) {
584 struct ipoib_mcast *broadcast;
585
586 broadcast = ipoib_mcast_alloc(dev);
587 if (!broadcast) {
588 ipoib_warn(priv, "failed to allocate broadcast group\n");
589 /*
590 * Restart us after a 1 second delay to retry
591 * creating our broadcast group and attaching to
592 * it. Until this succeeds, this ipoib dev is
593 * completely stalled (multicast wise).
594 */
595 __ipoib_mcast_schedule_join_thread(priv, NULL, delay: 1);
596 goto out;
597 }
598
599 memcpy(broadcast->mcmember.mgid.raw, priv->dev->broadcast + 4,
600 sizeof (union ib_gid));
601 priv->broadcast = broadcast;
602
603 __ipoib_mcast_add(dev, mcast: priv->broadcast);
604 }
605
606 if (!test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
607 if (IS_ERR_OR_NULL(ptr: priv->broadcast->mc) &&
608 !test_bit(IPOIB_MCAST_FLAG_BUSY, &priv->broadcast->flags)) {
609 mcast = priv->broadcast;
610 if (mcast->backoff > 1 &&
611 time_before(jiffies, mcast->delay_until)) {
612 delay_until = mcast->delay_until;
613 mcast = NULL;
614 }
615 }
616 goto out;
617 }
618
619 /*
620 * We'll never get here until the broadcast group is both allocated
621 * and attached
622 */
623 list_for_each_entry(mcast, &priv->multicast_list, list) {
624 if (IS_ERR_OR_NULL(ptr: mcast->mc) &&
625 !test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags) &&
626 (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags) ||
627 !skb_queue_empty(list: &mcast->pkt_queue))) {
628 if (mcast->backoff == 1 ||
629 time_after_eq(jiffies, mcast->delay_until)) {
630 /* Found the next unjoined group */
631 if (ipoib_mcast_join(dev, mcast)) {
632 spin_unlock_irq(lock: &priv->lock);
633 return;
634 }
635 } else if (!delay_until ||
636 time_before(mcast->delay_until, delay_until))
637 delay_until = mcast->delay_until;
638 }
639 }
640
641 mcast = NULL;
642 ipoib_dbg_mcast(priv, "successfully started all multicast joins\n");
643
644out:
645 if (delay_until) {
646 cancel_delayed_work(dwork: &priv->mcast_task);
647 queue_delayed_work(wq: priv->wq, dwork: &priv->mcast_task,
648 delay: delay_until - jiffies);
649 }
650 if (mcast)
651 ipoib_mcast_join(dev, mcast);
652
653 spin_unlock_irq(lock: &priv->lock);
654}
655
656void ipoib_mcast_start_thread(struct net_device *dev)
657{
658 struct ipoib_dev_priv *priv = ipoib_priv(dev);
659 unsigned long flags;
660
661 ipoib_dbg_mcast(priv, "starting multicast thread\n");
662
663 spin_lock_irqsave(&priv->lock, flags);
664 __ipoib_mcast_schedule_join_thread(priv, NULL, delay: 0);
665 spin_unlock_irqrestore(lock: &priv->lock, flags);
666}
667
668void ipoib_mcast_stop_thread(struct net_device *dev)
669{
670 struct ipoib_dev_priv *priv = ipoib_priv(dev);
671
672 ipoib_dbg_mcast(priv, "stopping multicast thread\n");
673
674 cancel_delayed_work_sync(dwork: &priv->mcast_task);
675}
676
677static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
678{
679 struct ipoib_dev_priv *priv = ipoib_priv(dev);
680 struct rdma_netdev *rn = netdev_priv(dev);
681 int ret = 0;
682
683 if (test_and_clear_bit(nr: IPOIB_MCAST_FLAG_BUSY, addr: &mcast->flags))
684 ipoib_warn(priv, "ipoib_mcast_leave on an in-flight join\n");
685
686 if (!IS_ERR_OR_NULL(ptr: mcast->mc))
687 ib_sa_free_multicast(multicast: mcast->mc);
688
689 if (test_and_clear_bit(nr: IPOIB_MCAST_FLAG_ATTACHED, addr: &mcast->flags)) {
690 ipoib_dbg_mcast(priv, "leaving MGID %pI6\n",
691 mcast->mcmember.mgid.raw);
692
693 /* Remove ourselves from the multicast group */
694 ret = rn->detach_mcast(dev, priv->ca, &mcast->mcmember.mgid,
695 be16_to_cpu(mcast->mcmember.mlid));
696 if (ret)
697 ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
698 } else if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags))
699 ipoib_dbg(priv, "leaving with no mcmember but not a "
700 "SENDONLY join\n");
701
702 return 0;
703}
704
705/*
706 * Check if the multicast group is sendonly. If so remove it from the maps
707 * and add to the remove list
708 */
709void ipoib_check_and_add_mcast_sendonly(struct ipoib_dev_priv *priv, u8 *mgid,
710 struct list_head *remove_list)
711{
712 /* Is this multicast ? */
713 if (*mgid == 0xff) {
714 struct ipoib_mcast *mcast = __ipoib_mcast_find(dev: priv->dev, mgid);
715
716 if (mcast && test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
717 list_del(entry: &mcast->list);
718 rb_erase(&mcast->rb_node, &priv->multicast_tree);
719 list_add_tail(new: &mcast->list, head: remove_list);
720 }
721 }
722}
723
724void ipoib_mcast_remove_list(struct list_head *remove_list)
725{
726 struct ipoib_mcast *mcast, *tmcast;
727
728 /*
729 * make sure the in-flight joins have finished before we attempt
730 * to leave
731 */
732 list_for_each_entry_safe(mcast, tmcast, remove_list, list)
733 if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
734 wait_for_completion(&mcast->done);
735
736 list_for_each_entry_safe(mcast, tmcast, remove_list, list) {
737 ipoib_mcast_leave(dev: mcast->dev, mcast);
738 ipoib_mcast_free(mcast);
739 }
740}
741
742void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb)
743{
744 struct ipoib_dev_priv *priv = ipoib_priv(dev);
745 struct rdma_netdev *rn = netdev_priv(dev);
746 struct ipoib_mcast *mcast;
747 unsigned long flags;
748 void *mgid = daddr + 4;
749
750 spin_lock_irqsave(&priv->lock, flags);
751
752 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags) ||
753 !priv->broadcast ||
754 !test_bit(IPOIB_MCAST_FLAG_ATTACHED, &priv->broadcast->flags)) {
755 ++dev->stats.tx_dropped;
756 dev_kfree_skb_any(skb);
757 goto unlock;
758 }
759
760 mcast = __ipoib_mcast_find(dev, mgid);
761 if (!mcast || !mcast->ah) {
762 if (!mcast) {
763 /* Let's create a new send only group now */
764 ipoib_dbg_mcast(priv, "setting up send only multicast group for %pI6\n",
765 mgid);
766
767 mcast = ipoib_mcast_alloc(dev);
768 if (!mcast) {
769 ipoib_warn(priv, "unable to allocate memory "
770 "for multicast structure\n");
771 ++dev->stats.tx_dropped;
772 dev_kfree_skb_any(skb);
773 goto unlock;
774 }
775
776 set_bit(nr: IPOIB_MCAST_FLAG_SENDONLY, addr: &mcast->flags);
777 memcpy(mcast->mcmember.mgid.raw, mgid,
778 sizeof (union ib_gid));
779 __ipoib_mcast_add(dev, mcast);
780 list_add_tail(new: &mcast->list, head: &priv->multicast_list);
781 }
782 if (skb_queue_len(list_: &mcast->pkt_queue) < IPOIB_MAX_MCAST_QUEUE) {
783 /* put pseudoheader back on for next time */
784 skb_push(skb, len: sizeof(struct ipoib_pseudo_header));
785 skb_queue_tail(list: &mcast->pkt_queue, newsk: skb);
786 } else {
787 ++dev->stats.tx_dropped;
788 dev_kfree_skb_any(skb);
789 }
790 if (!test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags)) {
791 __ipoib_mcast_schedule_join_thread(priv, NULL, delay: 0);
792 }
793 } else {
794 struct ipoib_neigh *neigh;
795
796 spin_unlock_irqrestore(lock: &priv->lock, flags);
797 neigh = ipoib_neigh_get(dev, daddr);
798 spin_lock_irqsave(&priv->lock, flags);
799 if (!neigh) {
800 neigh = ipoib_neigh_alloc(daddr, dev);
801 /* Make sure that the neigh will be added only
802 * once to mcast list.
803 */
804 if (neigh && list_empty(head: &neigh->list)) {
805 kref_get(kref: &mcast->ah->ref);
806 neigh->ah = mcast->ah;
807 neigh->ah->valid = 1;
808 list_add_tail(new: &neigh->list, head: &mcast->neigh_list);
809 }
810 }
811 spin_unlock_irqrestore(lock: &priv->lock, flags);
812 mcast->ah->last_send = rn->send(dev, skb, mcast->ah->ah,
813 IB_MULTICAST_QPN);
814 if (neigh)
815 ipoib_neigh_put(neigh);
816 return;
817 }
818
819unlock:
820 spin_unlock_irqrestore(lock: &priv->lock, flags);
821}
822
823void ipoib_mcast_dev_flush(struct net_device *dev)
824{
825 struct ipoib_dev_priv *priv = ipoib_priv(dev);
826 LIST_HEAD(remove_list);
827 struct ipoib_mcast *mcast, *tmcast;
828 unsigned long flags;
829
830 mutex_lock(&priv->mcast_mutex);
831 ipoib_dbg_mcast(priv, "flushing multicast list\n");
832
833 spin_lock_irqsave(&priv->lock, flags);
834
835 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
836 list_del(entry: &mcast->list);
837 rb_erase(&mcast->rb_node, &priv->multicast_tree);
838 list_add_tail(new: &mcast->list, head: &remove_list);
839 }
840
841 if (priv->broadcast) {
842 rb_erase(&priv->broadcast->rb_node, &priv->multicast_tree);
843 list_add_tail(new: &priv->broadcast->list, head: &remove_list);
844 priv->broadcast = NULL;
845 }
846
847 spin_unlock_irqrestore(lock: &priv->lock, flags);
848
849 ipoib_mcast_remove_list(remove_list: &remove_list);
850 mutex_unlock(lock: &priv->mcast_mutex);
851}
852
853static int ipoib_mcast_addr_is_valid(const u8 *addr, const u8 *broadcast)
854{
855 /* reserved QPN, prefix, scope */
856 if (memcmp(p: addr, q: broadcast, size: 6))
857 return 0;
858 /* signature lower, pkey */
859 if (memcmp(p: addr + 7, q: broadcast + 7, size: 3))
860 return 0;
861 return 1;
862}
863
864void ipoib_mcast_restart_task(struct work_struct *work)
865{
866 struct ipoib_dev_priv *priv =
867 container_of(work, struct ipoib_dev_priv, restart_task);
868 struct net_device *dev = priv->dev;
869 struct netdev_hw_addr *ha;
870 struct ipoib_mcast *mcast, *tmcast;
871 LIST_HEAD(remove_list);
872 struct ib_sa_mcmember_rec rec;
873
874 if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))
875 /*
876 * shortcut...on shutdown flush is called next, just
877 * let it do all the work
878 */
879 return;
880
881 ipoib_dbg_mcast(priv, "restarting multicast task\n");
882
883 netif_addr_lock_bh(dev);
884 spin_lock_irq(lock: &priv->lock);
885
886 /*
887 * Unfortunately, the networking core only gives us a list of all of
888 * the multicast hardware addresses. We need to figure out which ones
889 * are new and which ones have been removed
890 */
891
892 /* Clear out the found flag */
893 list_for_each_entry(mcast, &priv->multicast_list, list)
894 clear_bit(nr: IPOIB_MCAST_FLAG_FOUND, addr: &mcast->flags);
895
896 /* Mark all of the entries that are found or don't exist */
897 netdev_for_each_mc_addr(ha, dev) {
898 union ib_gid mgid;
899
900 if (!ipoib_mcast_addr_is_valid(addr: ha->addr, broadcast: dev->broadcast))
901 continue;
902
903 memcpy(mgid.raw, ha->addr + 4, sizeof(mgid));
904
905 mcast = __ipoib_mcast_find(dev, mgid: &mgid);
906 if (!mcast || test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
907 struct ipoib_mcast *nmcast;
908
909 /* ignore group which is directly joined by userspace */
910 if (test_bit(IPOIB_FLAG_UMCAST, &priv->flags) &&
911 !ib_sa_get_mcmember_rec(device: priv->ca, port_num: priv->port, mgid: &mgid, rec: &rec)) {
912 ipoib_dbg_mcast(priv, "ignoring multicast entry for mgid %pI6\n",
913 mgid.raw);
914 continue;
915 }
916
917 /* Not found or send-only group, let's add a new entry */
918 ipoib_dbg_mcast(priv, "adding multicast entry for mgid %pI6\n",
919 mgid.raw);
920
921 nmcast = ipoib_mcast_alloc(dev);
922 if (!nmcast) {
923 ipoib_warn(priv, "unable to allocate memory for multicast structure\n");
924 continue;
925 }
926
927 set_bit(nr: IPOIB_MCAST_FLAG_FOUND, addr: &nmcast->flags);
928
929 nmcast->mcmember.mgid = mgid;
930
931 if (mcast) {
932 /* Destroy the send only entry */
933 list_move_tail(list: &mcast->list, head: &remove_list);
934
935 rb_replace_node(victim: &mcast->rb_node,
936 new: &nmcast->rb_node,
937 root: &priv->multicast_tree);
938 } else
939 __ipoib_mcast_add(dev, mcast: nmcast);
940
941 list_add_tail(new: &nmcast->list, head: &priv->multicast_list);
942 }
943
944 if (mcast)
945 set_bit(nr: IPOIB_MCAST_FLAG_FOUND, addr: &mcast->flags);
946 }
947
948 /* Remove all of the entries don't exist anymore */
949 list_for_each_entry_safe(mcast, tmcast, &priv->multicast_list, list) {
950 if (!test_bit(IPOIB_MCAST_FLAG_FOUND, &mcast->flags) &&
951 !test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
952 ipoib_dbg_mcast(priv, "deleting multicast group %pI6\n",
953 mcast->mcmember.mgid.raw);
954
955 rb_erase(&mcast->rb_node, &priv->multicast_tree);
956
957 /* Move to the remove list */
958 list_move_tail(list: &mcast->list, head: &remove_list);
959 }
960 }
961
962 spin_unlock_irq(lock: &priv->lock);
963 netif_addr_unlock_bh(dev);
964
965 ipoib_mcast_remove_list(remove_list: &remove_list);
966
967 /*
968 * Double check that we are still up
969 */
970 if (test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
971 spin_lock_irq(lock: &priv->lock);
972 __ipoib_mcast_schedule_join_thread(priv, NULL, delay: 0);
973 spin_unlock_irq(lock: &priv->lock);
974 }
975}
976
977#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
978
979struct ipoib_mcast_iter *ipoib_mcast_iter_init(struct net_device *dev)
980{
981 struct ipoib_mcast_iter *iter;
982
983 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
984 if (!iter)
985 return NULL;
986
987 iter->dev = dev;
988 memset(iter->mgid.raw, 0, 16);
989
990 if (ipoib_mcast_iter_next(iter)) {
991 kfree(objp: iter);
992 return NULL;
993 }
994
995 return iter;
996}
997
998int ipoib_mcast_iter_next(struct ipoib_mcast_iter *iter)
999{
1000 struct ipoib_dev_priv *priv = ipoib_priv(dev: iter->dev);
1001 struct rb_node *n;
1002 struct ipoib_mcast *mcast;
1003 int ret = 1;
1004
1005 spin_lock_irq(lock: &priv->lock);
1006
1007 n = rb_first(root: &priv->multicast_tree);
1008
1009 while (n) {
1010 mcast = rb_entry(n, struct ipoib_mcast, rb_node);
1011
1012 if (memcmp(p: iter->mgid.raw, q: mcast->mcmember.mgid.raw,
1013 size: sizeof (union ib_gid)) < 0) {
1014 iter->mgid = mcast->mcmember.mgid;
1015 iter->created = mcast->created;
1016 iter->queuelen = skb_queue_len(list_: &mcast->pkt_queue);
1017 iter->complete = !!mcast->ah;
1018 iter->send_only = !!(mcast->flags & (1 << IPOIB_MCAST_FLAG_SENDONLY));
1019
1020 ret = 0;
1021
1022 break;
1023 }
1024
1025 n = rb_next(n);
1026 }
1027
1028 spin_unlock_irq(lock: &priv->lock);
1029
1030 return ret;
1031}
1032
1033void ipoib_mcast_iter_read(struct ipoib_mcast_iter *iter,
1034 union ib_gid *mgid,
1035 unsigned long *created,
1036 unsigned int *queuelen,
1037 unsigned int *complete,
1038 unsigned int *send_only)
1039{
1040 *mgid = iter->mgid;
1041 *created = iter->created;
1042 *queuelen = iter->queuelen;
1043 *complete = iter->complete;
1044 *send_only = iter->send_only;
1045}
1046
1047#endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
1048

source code of linux/drivers/infiniband/ulp/ipoib/ipoib_multicast.c