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-rw-r--r--net/tipc/bcast.c806
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diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c
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1/*
2 * net/tipc/bcast.c: TIPC broadcast code
3 *
4 * Copyright (c) 2004-2006, Ericsson AB
5 * Copyright (c) 2004, Intel Corporation.
6 * Copyright (c) 2005, Wind River Systems
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
20 *
21 * Alternatively, this software may be distributed under the terms of the
22 * GNU General Public License ("GPL") version 2 as published by the Free
23 * Software Foundation.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include "core.h"
39#include "msg.h"
40#include "dbg.h"
41#include "link.h"
42#include "net.h"
43#include "node.h"
44#include "port.h"
45#include "addr.h"
46#include "node_subscr.h"
47#include "name_distr.h"
48#include "bearer.h"
49#include "name_table.h"
50#include "bcast.h"
51
52
53#define MAX_PKT_DEFAULT_MCAST 1500 /* bcast link max packet size (fixed) */
54
55#define BCLINK_WIN_DEFAULT 20 /* bcast link window size (default) */
56
57#define BCLINK_LOG_BUF_SIZE 0
58
59/**
60 * struct bcbearer_pair - a pair of bearers used by broadcast link
61 * @primary: pointer to primary bearer
62 * @secondary: pointer to secondary bearer
63 *
64 * Bearers must have same priority and same set of reachable destinations
65 * to be paired.
66 */
67
68struct bcbearer_pair {
69 struct bearer *primary;
70 struct bearer *secondary;
71};
72
73/**
74 * struct bcbearer - bearer used by broadcast link
75 * @bearer: (non-standard) broadcast bearer structure
76 * @media: (non-standard) broadcast media structure
77 * @bpairs: array of bearer pairs
78 * @bpairs_temp: array of bearer pairs used during creation of "bpairs"
79 */
80
81struct bcbearer {
82 struct bearer bearer;
83 struct media media;
84 struct bcbearer_pair bpairs[MAX_BEARERS];
85 struct bcbearer_pair bpairs_temp[TIPC_NUM_LINK_PRI];
86};
87
88/**
89 * struct bclink - link used for broadcast messages
90 * @link: (non-standard) broadcast link structure
91 * @node: (non-standard) node structure representing b'cast link's peer node
92 *
93 * Handles sequence numbering, fragmentation, bundling, etc.
94 */
95
96struct bclink {
97 struct link link;
98 struct node node;
99};
100
101
102static struct bcbearer *bcbearer = NULL;
103static struct bclink *bclink = NULL;
104static struct link *bcl = NULL;
105static spinlock_t bc_lock = SPIN_LOCK_UNLOCKED;
106
107char bc_link_name[] = "multicast-link";
108
109
110static inline u32 buf_seqno(struct sk_buff *buf)
111{
112 return msg_seqno(buf_msg(buf));
113}
114
115static inline u32 bcbuf_acks(struct sk_buff *buf)
116{
117 return (u32)(unsigned long)TIPC_SKB_CB(buf)->handle;
118}
119
120static inline void bcbuf_set_acks(struct sk_buff *buf, u32 acks)
121{
122 TIPC_SKB_CB(buf)->handle = (void *)(unsigned long)acks;
123}
124
125static inline void bcbuf_decr_acks(struct sk_buff *buf)
126{
127 bcbuf_set_acks(buf, bcbuf_acks(buf) - 1);
128}
129
130
131/**
132 * bclink_set_gap - set gap according to contents of current deferred pkt queue
133 *
134 * Called with 'node' locked, bc_lock unlocked
135 */
136
137static inline void bclink_set_gap(struct node *n_ptr)
138{
139 struct sk_buff *buf = n_ptr->bclink.deferred_head;
140
141 n_ptr->bclink.gap_after = n_ptr->bclink.gap_to =
142 mod(n_ptr->bclink.last_in);
143 if (unlikely(buf != NULL))
144 n_ptr->bclink.gap_to = mod(buf_seqno(buf) - 1);
145}
146
147/**
148 * bclink_ack_allowed - test if ACK or NACK message can be sent at this moment
149 *
150 * This mechanism endeavours to prevent all nodes in network from trying
151 * to ACK or NACK at the same time.
152 *
153 * Note: TIPC uses a different trigger to distribute ACKs than it does to
154 * distribute NACKs, but tries to use the same spacing (divide by 16).
155 */
156
157static inline int bclink_ack_allowed(u32 n)
158{
159 return((n % TIPC_MIN_LINK_WIN) == tipc_own_tag);
160}
161
162
163/**
164 * bclink_retransmit_pkt - retransmit broadcast packets
165 * @after: sequence number of last packet to *not* retransmit
166 * @to: sequence number of last packet to retransmit
167 *
168 * Called with 'node' locked, bc_lock unlocked
169 */
170
171static void bclink_retransmit_pkt(u32 after, u32 to)
172{
173 struct sk_buff *buf;
174
175 spin_lock_bh(&bc_lock);
176 buf = bcl->first_out;
177 while (buf && less_eq(buf_seqno(buf), after)) {
178 buf = buf->next;
179 }
180 if (buf != NULL)
181 link_retransmit(bcl, buf, mod(to - after));
182 spin_unlock_bh(&bc_lock);
183}
184
185/**
186 * bclink_acknowledge - handle acknowledgement of broadcast packets
187 * @n_ptr: node that sent acknowledgement info
188 * @acked: broadcast sequence # that has been acknowledged
189 *
190 * Node is locked, bc_lock unlocked.
191 */
192
193void bclink_acknowledge(struct node *n_ptr, u32 acked)
194{
195 struct sk_buff *crs;
196 struct sk_buff *next;
197 unsigned int released = 0;
198
199 if (less_eq(acked, n_ptr->bclink.acked))
200 return;
201
202 spin_lock_bh(&bc_lock);
203
204 /* Skip over packets that node has previously acknowledged */
205
206 crs = bcl->first_out;
207 while (crs && less_eq(buf_seqno(crs), n_ptr->bclink.acked)) {
208 crs = crs->next;
209 }
210
211 /* Update packets that node is now acknowledging */
212
213 while (crs && less_eq(buf_seqno(crs), acked)) {
214 next = crs->next;
215 bcbuf_decr_acks(crs);
216 if (bcbuf_acks(crs) == 0) {
217 bcl->first_out = next;
218 bcl->out_queue_size--;
219 buf_discard(crs);
220 released = 1;
221 }
222 crs = next;
223 }
224 n_ptr->bclink.acked = acked;
225
226 /* Try resolving broadcast link congestion, if necessary */
227
228 if (unlikely(bcl->next_out))
229 link_push_queue(bcl);
230 if (unlikely(released && !list_empty(&bcl->waiting_ports)))
231 link_wakeup_ports(bcl, 0);
232 spin_unlock_bh(&bc_lock);
233}
234
235/**
236 * bclink_send_ack - unicast an ACK msg
237 *
238 * net_lock and node lock set
239 */
240
241static void bclink_send_ack(struct node *n_ptr)
242{
243 struct link *l_ptr = n_ptr->active_links[n_ptr->addr & 1];
244
245 if (l_ptr != NULL)
246 link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
247}
248
249/**
250 * bclink_send_nack- broadcast a NACK msg
251 *
252 * net_lock and node lock set
253 */
254
255static void bclink_send_nack(struct node *n_ptr)
256{
257 struct sk_buff *buf;
258 struct tipc_msg *msg;
259
260 if (!less(n_ptr->bclink.gap_after, n_ptr->bclink.gap_to))
261 return;
262
263 buf = buf_acquire(INT_H_SIZE);
264 if (buf) {
265 msg = buf_msg(buf);
266 msg_init(msg, BCAST_PROTOCOL, STATE_MSG,
267 TIPC_OK, INT_H_SIZE, n_ptr->addr);
268 msg_set_mc_netid(msg, tipc_net_id);
269 msg_set_bcast_ack(msg, mod(n_ptr->bclink.last_in));
270 msg_set_bcgap_after(msg, n_ptr->bclink.gap_after);
271 msg_set_bcgap_to(msg, n_ptr->bclink.gap_to);
272 msg_set_bcast_tag(msg, tipc_own_tag);
273
274 if (bearer_send(&bcbearer->bearer, buf, 0)) {
275 bcl->stats.sent_nacks++;
276 buf_discard(buf);
277 } else {
278 bearer_schedule(bcl->b_ptr, bcl);
279 bcl->proto_msg_queue = buf;
280 bcl->stats.bearer_congs++;
281 }
282
283 /*
284 * Ensure we doesn't send another NACK msg to the node
285 * until 16 more deferred messages arrive from it
286 * (i.e. helps prevent all nodes from NACK'ing at same time)
287 */
288
289 n_ptr->bclink.nack_sync = tipc_own_tag;
290 }
291}
292
293/**
294 * bclink_check_gap - send a NACK if a sequence gap exists
295 *
296 * net_lock and node lock set
297 */
298
299void bclink_check_gap(struct node *n_ptr, u32 last_sent)
300{
301 if (!n_ptr->bclink.supported ||
302 less_eq(last_sent, mod(n_ptr->bclink.last_in)))
303 return;
304
305 bclink_set_gap(n_ptr);
306 if (n_ptr->bclink.gap_after == n_ptr->bclink.gap_to)
307 n_ptr->bclink.gap_to = last_sent;
308 bclink_send_nack(n_ptr);
309}
310
311/**
312 * bclink_peek_nack - process a NACK msg meant for another node
313 *
314 * Only net_lock set.
315 */
316
317void bclink_peek_nack(u32 dest, u32 sender_tag, u32 gap_after, u32 gap_to)
318{
319 struct node *n_ptr = node_find(dest);
320 u32 my_after, my_to;
321
322 if (unlikely(!n_ptr || !node_is_up(n_ptr)))
323 return;
324 node_lock(n_ptr);
325 /*
326 * Modify gap to suppress unnecessary NACKs from this node
327 */
328 my_after = n_ptr->bclink.gap_after;
329 my_to = n_ptr->bclink.gap_to;
330
331 if (less_eq(gap_after, my_after)) {
332 if (less(my_after, gap_to) && less(gap_to, my_to))
333 n_ptr->bclink.gap_after = gap_to;
334 else if (less_eq(my_to, gap_to))
335 n_ptr->bclink.gap_to = n_ptr->bclink.gap_after;
336 } else if (less_eq(gap_after, my_to)) {
337 if (less_eq(my_to, gap_to))
338 n_ptr->bclink.gap_to = gap_after;
339 } else {
340 /*
341 * Expand gap if missing bufs not in deferred queue:
342 */
343 struct sk_buff *buf = n_ptr->bclink.deferred_head;
344 u32 prev = n_ptr->bclink.gap_to;
345
346 for (; buf; buf = buf->next) {
347 u32 seqno = buf_seqno(buf);
348
349 if (mod(seqno - prev) != 1)
350 buf = NULL;
351 if (seqno == gap_after)
352 break;
353 prev = seqno;
354 }
355 if (buf == NULL)
356 n_ptr->bclink.gap_to = gap_after;
357 }
358 /*
359 * Some nodes may send a complementary NACK now:
360 */
361 if (bclink_ack_allowed(sender_tag + 1)) {
362 if (n_ptr->bclink.gap_to != n_ptr->bclink.gap_after) {
363 bclink_send_nack(n_ptr);
364 bclink_set_gap(n_ptr);
365 }
366 }
367 node_unlock(n_ptr);
368}
369
370/**
371 * bclink_send_msg - broadcast a packet to all nodes in cluster
372 */
373
374int bclink_send_msg(struct sk_buff *buf)
375{
376 int res;
377
378 spin_lock_bh(&bc_lock);
379
380 res = link_send_buf(bcl, buf);
381 if (unlikely(res == -ELINKCONG))
382 buf_discard(buf);
383 else
384 bcl->stats.sent_info++;
385
386 if (bcl->out_queue_size > bcl->stats.max_queue_sz)
387 bcl->stats.max_queue_sz = bcl->out_queue_size;
388 bcl->stats.queue_sz_counts++;
389 bcl->stats.accu_queue_sz += bcl->out_queue_size;
390
391 spin_unlock_bh(&bc_lock);
392 return res;
393}
394
395/**
396 * bclink_recv_pkt - receive a broadcast packet, and deliver upwards
397 *
398 * net_lock is read_locked, no other locks set
399 */
400
401void bclink_recv_pkt(struct sk_buff *buf)
402{
403 struct tipc_msg *msg = buf_msg(buf);
404 struct node* node = node_find(msg_prevnode(msg));
405 u32 next_in;
406 u32 seqno;
407 struct sk_buff *deferred;
408
409 msg_dbg(msg, "<BC<<<");
410
411 if (unlikely(!node || !node_is_up(node) || !node->bclink.supported ||
412 (msg_mc_netid(msg) != tipc_net_id))) {
413 buf_discard(buf);
414 return;
415 }
416
417 if (unlikely(msg_user(msg) == BCAST_PROTOCOL)) {
418 msg_dbg(msg, "<BCNACK<<<");
419 if (msg_destnode(msg) == tipc_own_addr) {
420 node_lock(node);
421 bclink_acknowledge(node, msg_bcast_ack(msg));
422 node_unlock(node);
423 bcl->stats.recv_nacks++;
424 bclink_retransmit_pkt(msg_bcgap_after(msg),
425 msg_bcgap_to(msg));
426 } else {
427 bclink_peek_nack(msg_destnode(msg),
428 msg_bcast_tag(msg),
429 msg_bcgap_after(msg),
430 msg_bcgap_to(msg));
431 }
432 buf_discard(buf);
433 return;
434 }
435
436 node_lock(node);
437receive:
438 deferred = node->bclink.deferred_head;
439 next_in = mod(node->bclink.last_in + 1);
440 seqno = msg_seqno(msg);
441
442 if (likely(seqno == next_in)) {
443 bcl->stats.recv_info++;
444 node->bclink.last_in++;
445 bclink_set_gap(node);
446 if (unlikely(bclink_ack_allowed(seqno))) {
447 bclink_send_ack(node);
448 bcl->stats.sent_acks++;
449 }
450 if (likely(msg_isdata(msg))) {
451 node_unlock(node);
452 port_recv_mcast(buf, NULL);
453 } else if (msg_user(msg) == MSG_BUNDLER) {
454 bcl->stats.recv_bundles++;
455 bcl->stats.recv_bundled += msg_msgcnt(msg);
456 node_unlock(node);
457 link_recv_bundle(buf);
458 } else if (msg_user(msg) == MSG_FRAGMENTER) {
459 bcl->stats.recv_fragments++;
460 if (link_recv_fragment(&node->bclink.defragm,
461 &buf, &msg))
462 bcl->stats.recv_fragmented++;
463 node_unlock(node);
464 net_route_msg(buf);
465 } else {
466 node_unlock(node);
467 net_route_msg(buf);
468 }
469 if (deferred && (buf_seqno(deferred) == mod(next_in + 1))) {
470 node_lock(node);
471 buf = deferred;
472 msg = buf_msg(buf);
473 node->bclink.deferred_head = deferred->next;
474 goto receive;
475 }
476 return;
477 } else if (less(next_in, seqno)) {
478 u32 gap_after = node->bclink.gap_after;
479 u32 gap_to = node->bclink.gap_to;
480
481 if (link_defer_pkt(&node->bclink.deferred_head,
482 &node->bclink.deferred_tail,
483 buf)) {
484 node->bclink.nack_sync++;
485 bcl->stats.deferred_recv++;
486 if (seqno == mod(gap_after + 1))
487 node->bclink.gap_after = seqno;
488 else if (less(gap_after, seqno) && less(seqno, gap_to))
489 node->bclink.gap_to = seqno;
490 }
491 if (bclink_ack_allowed(node->bclink.nack_sync)) {
492 if (gap_to != gap_after)
493 bclink_send_nack(node);
494 bclink_set_gap(node);
495 }
496 } else {
497 bcl->stats.duplicates++;
498 buf_discard(buf);
499 }
500 node_unlock(node);
501}
502
503u32 bclink_get_last_sent(void)
504{
505 u32 last_sent = mod(bcl->next_out_no - 1);
506
507 if (bcl->next_out)
508 last_sent = mod(buf_seqno(bcl->next_out) - 1);
509 return last_sent;
510}
511
512u32 bclink_acks_missing(struct node *n_ptr)
513{
514 return (n_ptr->bclink.supported &&
515 (bclink_get_last_sent() != n_ptr->bclink.acked));
516}
517
518
519/**
520 * bcbearer_send - send a packet through the broadcast pseudo-bearer
521 *
522 * Send through as many bearers as necessary to reach all nodes
523 * that support TIPC multicasting.
524 *
525 * Returns 0 if packet sent successfully, non-zero if not
526 */
527
528int bcbearer_send(struct sk_buff *buf,
529 struct tipc_bearer *unused1,
530 struct tipc_media_addr *unused2)
531{
532 static int send_count = 0;
533
534 struct node_map remains;
535 struct node_map remains_new;
536 int bp_index;
537 int swap_time;
538
539 /* Prepare buffer for broadcasting (if first time trying to send it) */
540
541 if (likely(!msg_non_seq(buf_msg(buf)))) {
542 struct tipc_msg *msg;
543
544 assert(cluster_bcast_nodes.count != 0);
545 bcbuf_set_acks(buf, cluster_bcast_nodes.count);
546 msg = buf_msg(buf);
547 msg_set_non_seq(msg);
548 msg_set_mc_netid(msg, tipc_net_id);
549 }
550
551 /* Determine if bearer pairs should be swapped following this attempt */
552
553 if ((swap_time = (++send_count >= 10)))
554 send_count = 0;
555
556 /* Send buffer over bearers until all targets reached */
557
558 remains = cluster_bcast_nodes;
559
560 for (bp_index = 0; bp_index < MAX_BEARERS; bp_index++) {
561 struct bearer *p = bcbearer->bpairs[bp_index].primary;
562 struct bearer *s = bcbearer->bpairs[bp_index].secondary;
563
564 if (!p)
565 break; /* no more bearers to try */
566
567 nmap_diff(&remains, &p->nodes, &remains_new);
568 if (remains_new.count == remains.count)
569 continue; /* bearer pair doesn't add anything */
570
571 if (!p->publ.blocked &&
572 !p->media->send_msg(buf, &p->publ, &p->media->bcast_addr)) {
573 if (swap_time && s && !s->publ.blocked)
574 goto swap;
575 else
576 goto update;
577 }
578
579 if (!s || s->publ.blocked ||
580 s->media->send_msg(buf, &s->publ, &s->media->bcast_addr))
581 continue; /* unable to send using bearer pair */
582swap:
583 bcbearer->bpairs[bp_index].primary = s;
584 bcbearer->bpairs[bp_index].secondary = p;
585update:
586 if (remains_new.count == 0)
587 return TIPC_OK;
588
589 remains = remains_new;
590 }
591
592 /* Unable to reach all targets */
593
594 bcbearer->bearer.publ.blocked = 1;
595 bcl->stats.bearer_congs++;
596 return ~TIPC_OK;
597}
598
599/**
600 * bcbearer_sort - create sets of bearer pairs used by broadcast bearer
601 */
602
603void bcbearer_sort(void)
604{
605 struct bcbearer_pair *bp_temp = bcbearer->bpairs_temp;
606 struct bcbearer_pair *bp_curr;
607 int b_index;
608 int pri;
609
610 spin_lock_bh(&bc_lock);
611
612 /* Group bearers by priority (can assume max of two per priority) */
613
614 memset(bp_temp, 0, sizeof(bcbearer->bpairs_temp));
615
616 for (b_index = 0; b_index < MAX_BEARERS; b_index++) {
617 struct bearer *b = &bearers[b_index];
618
619 if (!b->active || !b->nodes.count)
620 continue;
621
622 if (!bp_temp[b->priority].primary)
623 bp_temp[b->priority].primary = b;
624 else
625 bp_temp[b->priority].secondary = b;
626 }
627
628 /* Create array of bearer pairs for broadcasting */
629
630 bp_curr = bcbearer->bpairs;
631 memset(bcbearer->bpairs, 0, sizeof(bcbearer->bpairs));
632
633 for (pri = (TIPC_NUM_LINK_PRI - 1); pri >= 0; pri--) {
634
635 if (!bp_temp[pri].primary)
636 continue;
637
638 bp_curr->primary = bp_temp[pri].primary;
639
640 if (bp_temp[pri].secondary) {
641 if (nmap_equal(&bp_temp[pri].primary->nodes,
642 &bp_temp[pri].secondary->nodes)) {
643 bp_curr->secondary = bp_temp[pri].secondary;
644 } else {
645 bp_curr++;
646 bp_curr->primary = bp_temp[pri].secondary;
647 }
648 }
649
650 bp_curr++;
651 }
652
653 spin_unlock_bh(&bc_lock);
654}
655
656/**
657 * bcbearer_push - resolve bearer congestion
658 *
659 * Forces bclink to push out any unsent packets, until all packets are gone
660 * or congestion reoccurs.
661 * No locks set when function called
662 */
663
664void bcbearer_push(void)
665{
666 struct bearer *b_ptr;
667
668 spin_lock_bh(&bc_lock);
669 b_ptr = &bcbearer->bearer;
670 if (b_ptr->publ.blocked) {
671 b_ptr->publ.blocked = 0;
672 bearer_lock_push(b_ptr);
673 }
674 spin_unlock_bh(&bc_lock);
675}
676
677
678int bclink_stats(char *buf, const u32 buf_size)
679{
680 struct print_buf pb;
681
682 if (!bcl)
683 return 0;
684
685 printbuf_init(&pb, buf, buf_size);
686
687 spin_lock_bh(&bc_lock);
688
689 tipc_printf(&pb, "Link <%s>\n"
690 " Window:%u packets\n",
691 bcl->name, bcl->queue_limit[0]);
692 tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
693 bcl->stats.recv_info,
694 bcl->stats.recv_fragments,
695 bcl->stats.recv_fragmented,
696 bcl->stats.recv_bundles,
697 bcl->stats.recv_bundled);
698 tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
699 bcl->stats.sent_info,
700 bcl->stats.sent_fragments,
701 bcl->stats.sent_fragmented,
702 bcl->stats.sent_bundles,
703 bcl->stats.sent_bundled);
704 tipc_printf(&pb, " RX naks:%u defs:%u dups:%u\n",
705 bcl->stats.recv_nacks,
706 bcl->stats.deferred_recv,
707 bcl->stats.duplicates);
708 tipc_printf(&pb, " TX naks:%u acks:%u dups:%u\n",
709 bcl->stats.sent_nacks,
710 bcl->stats.sent_acks,
711 bcl->stats.retransmitted);
712 tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n",
713 bcl->stats.bearer_congs,
714 bcl->stats.link_congs,
715 bcl->stats.max_queue_sz,
716 bcl->stats.queue_sz_counts
717 ? (bcl->stats.accu_queue_sz / bcl->stats.queue_sz_counts)
718 : 0);
719
720 spin_unlock_bh(&bc_lock);
721 return printbuf_validate(&pb);
722}
723
724int bclink_reset_stats(void)
725{
726 if (!bcl)
727 return -ENOPROTOOPT;
728
729 spin_lock_bh(&bc_lock);
730 memset(&bcl->stats, 0, sizeof(bcl->stats));
731 spin_unlock_bh(&bc_lock);
732 return TIPC_OK;
733}
734
735int bclink_set_queue_limits(u32 limit)
736{
737 if (!bcl)
738 return -ENOPROTOOPT;
739 if ((limit < TIPC_MIN_LINK_WIN) || (limit > TIPC_MAX_LINK_WIN))
740 return -EINVAL;
741
742 spin_lock_bh(&bc_lock);
743 link_set_queue_limits(bcl, limit);
744 spin_unlock_bh(&bc_lock);
745 return TIPC_OK;
746}
747
748int bclink_init(void)
749{
750 bcbearer = kmalloc(sizeof(*bcbearer), GFP_ATOMIC);
751 bclink = kmalloc(sizeof(*bclink), GFP_ATOMIC);
752 if (!bcbearer || !bclink) {
753 nomem:
754 warn("Memory squeeze; Failed to create multicast link\n");
755 kfree(bcbearer);
756 bcbearer = NULL;
757 kfree(bclink);
758 bclink = NULL;
759 return -ENOMEM;
760 }
761
762 memset(bcbearer, 0, sizeof(struct bcbearer));
763 INIT_LIST_HEAD(&bcbearer->bearer.cong_links);
764 bcbearer->bearer.media = &bcbearer->media;
765 bcbearer->media.send_msg = bcbearer_send;
766 sprintf(bcbearer->media.name, "tipc-multicast");
767
768 bcl = &bclink->link;
769 memset(bclink, 0, sizeof(struct bclink));
770 INIT_LIST_HEAD(&bcl->waiting_ports);
771 bcl->next_out_no = 1;
772 bclink->node.lock = SPIN_LOCK_UNLOCKED;
773 bcl->owner = &bclink->node;
774 bcl->max_pkt = MAX_PKT_DEFAULT_MCAST;
775 link_set_queue_limits(bcl, BCLINK_WIN_DEFAULT);
776 bcl->b_ptr = &bcbearer->bearer;
777 bcl->state = WORKING_WORKING;
778 sprintf(bcl->name, bc_link_name);
779
780 if (BCLINK_LOG_BUF_SIZE) {
781 char *pb = kmalloc(BCLINK_LOG_BUF_SIZE, GFP_ATOMIC);
782
783 if (!pb)
784 goto nomem;
785 printbuf_init(&bcl->print_buf, pb, BCLINK_LOG_BUF_SIZE);
786 }
787
788 return TIPC_OK;
789}
790
791void bclink_stop(void)
792{
793 spin_lock_bh(&bc_lock);
794 if (bcbearer) {
795 link_stop(bcl);
796 if (BCLINK_LOG_BUF_SIZE)
797 kfree(bcl->print_buf.buf);
798 bcl = NULL;
799 kfree(bclink);
800 bclink = NULL;
801 kfree(bcbearer);
802 bcbearer = NULL;
803 }
804 spin_unlock_bh(&bc_lock);
805}
806
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-23 21:38:21 -0500