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Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/bcast.c: TIPC broadcast code
3 *
Per Liden593a5f22006-01-11 19:14:19 +01004 * Copyright (c) 2004-2006, Ericsson AB
Per Lidenb97bf3f2006-01-02 19:04:38 +01005 * Copyright (c) 2004, Intel Corporation.
6 * Copyright (c) 2005, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01007 * All rights reserved.
8 *
Per Liden9ea1fd32006-01-11 13:30:43 +01009 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +010010 * modification, are permitted provided that the following conditions are met:
11 *
Per Liden9ea1fd32006-01-11 13:30:43 +010012 * 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.
Per Lidenb97bf3f2006-01-02 19:04:38 +010020 *
Per Liden9ea1fd32006-01-11 13:30:43 +010021 * 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
Per Lidenb97bf3f2006-01-02 19:04:38 +010035 * 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];
Per Liden16cb4b32006-01-13 22:22:22 +010085 struct bcbearer_pair bpairs_temp[TIPC_MAX_LINK_PRI + 1];
Per Lidenb97bf3f2006-01-02 19:04:38 +010086};
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
Per Liden4323add2006-01-18 00:38:21 +0100107char tipc_bclink_name[] = "multicast-link";
Per Lidenb97bf3f2006-01-02 19:04:38 +0100108
109
Sam Ravnborg05790c62006-03-20 22:37:04 -0800110static u32 buf_seqno(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100111{
112 return msg_seqno(buf_msg(buf));
113}
114
Sam Ravnborg05790c62006-03-20 22:37:04 -0800115static u32 bcbuf_acks(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100116{
David S. Miller880b0052006-01-12 13:22:32 -0800117 return (u32)(unsigned long)TIPC_SKB_CB(buf)->handle;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100118}
119
Sam Ravnborg05790c62006-03-20 22:37:04 -0800120static void bcbuf_set_acks(struct sk_buff *buf, u32 acks)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100121{
David S. Miller880b0052006-01-12 13:22:32 -0800122 TIPC_SKB_CB(buf)->handle = (void *)(unsigned long)acks;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100123}
124
Sam Ravnborg05790c62006-03-20 22:37:04 -0800125static void bcbuf_decr_acks(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100126{
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
Sam Ravnborg05790c62006-03-20 22:37:04 -0800137static void bclink_set_gap(struct node *n_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100138{
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
Sam Ravnborg05790c62006-03-20 22:37:04 -0800157static int bclink_ack_allowed(u32 n)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100158{
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)
Per Liden4323add2006-01-18 00:38:21 +0100181 tipc_link_retransmit(bcl, buf, mod(to - after));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100182 spin_unlock_bh(&bc_lock);
183}
184
185/**
Per Liden4323add2006-01-18 00:38:21 +0100186 * tipc_bclink_acknowledge - handle acknowledgement of broadcast packets
Per Lidenb97bf3f2006-01-02 19:04:38 +0100187 * @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
Per Liden4323add2006-01-18 00:38:21 +0100193void tipc_bclink_acknowledge(struct node *n_ptr, u32 acked)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100194{
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))
Per Liden4323add2006-01-18 00:38:21 +0100229 tipc_link_push_queue(bcl);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100230 if (unlikely(released && !list_empty(&bcl->waiting_ports)))
Per Liden4323add2006-01-18 00:38:21 +0100231 tipc_link_wakeup_ports(bcl, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100232 spin_unlock_bh(&bc_lock);
233}
234
235/**
236 * bclink_send_ack - unicast an ACK msg
237 *
Per Liden4323add2006-01-18 00:38:21 +0100238 * tipc_net_lock and node lock set
Per Lidenb97bf3f2006-01-02 19:04:38 +0100239 */
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)
Per Liden4323add2006-01-18 00:38:21 +0100246 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100247}
248
249/**
250 * bclink_send_nack- broadcast a NACK msg
251 *
Per Liden4323add2006-01-18 00:38:21 +0100252 * tipc_net_lock and node lock set
Per Lidenb97bf3f2006-01-02 19:04:38 +0100253 */
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
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800274 if (tipc_bearer_send(&bcbearer->bearer, buf, NULL)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100275 bcl->stats.sent_nacks++;
276 buf_discard(buf);
277 } else {
Per Liden4323add2006-01-18 00:38:21 +0100278 tipc_bearer_schedule(bcl->b_ptr, bcl);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100279 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/**
Per Liden4323add2006-01-18 00:38:21 +0100294 * tipc_bclink_check_gap - send a NACK if a sequence gap exists
Per Lidenb97bf3f2006-01-02 19:04:38 +0100295 *
Per Liden4323add2006-01-18 00:38:21 +0100296 * tipc_net_lock and node lock set
Per Lidenb97bf3f2006-01-02 19:04:38 +0100297 */
298
Per Liden4323add2006-01-18 00:38:21 +0100299void tipc_bclink_check_gap(struct node *n_ptr, u32 last_sent)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100300{
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/**
Per Liden4323add2006-01-18 00:38:21 +0100312 * tipc_bclink_peek_nack - process a NACK msg meant for another node
Per Lidenb97bf3f2006-01-02 19:04:38 +0100313 *
Per Liden4323add2006-01-18 00:38:21 +0100314 * Only tipc_net_lock set.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100315 */
316
Adrian Bunk988f0882006-03-20 22:37:52 -0800317static void tipc_bclink_peek_nack(u32 dest, u32 sender_tag, u32 gap_after, u32 gap_to)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100318{
Per Liden4323add2006-01-18 00:38:21 +0100319 struct node *n_ptr = tipc_node_find(dest);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100320 u32 my_after, my_to;
321
Per Liden4323add2006-01-18 00:38:21 +0100322 if (unlikely(!n_ptr || !tipc_node_is_up(n_ptr)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100323 return;
Per Liden4323add2006-01-18 00:38:21 +0100324 tipc_node_lock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100325 /*
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 }
Per Liden4323add2006-01-18 00:38:21 +0100367 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100368}
369
370/**
Per Liden4323add2006-01-18 00:38:21 +0100371 * tipc_bclink_send_msg - broadcast a packet to all nodes in cluster
Per Lidenb97bf3f2006-01-02 19:04:38 +0100372 */
373
Per Liden4323add2006-01-18 00:38:21 +0100374int tipc_bclink_send_msg(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100375{
376 int res;
377
378 spin_lock_bh(&bc_lock);
379
Per Liden4323add2006-01-18 00:38:21 +0100380 res = tipc_link_send_buf(bcl, buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100381 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/**
Per Liden4323add2006-01-18 00:38:21 +0100396 * tipc_bclink_recv_pkt - receive a broadcast packet, and deliver upwards
Per Lidenb97bf3f2006-01-02 19:04:38 +0100397 *
Per Liden4323add2006-01-18 00:38:21 +0100398 * tipc_net_lock is read_locked, no other locks set
Per Lidenb97bf3f2006-01-02 19:04:38 +0100399 */
400
Per Liden4323add2006-01-18 00:38:21 +0100401void tipc_bclink_recv_pkt(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100402{
403 struct tipc_msg *msg = buf_msg(buf);
Per Liden4323add2006-01-18 00:38:21 +0100404 struct node* node = tipc_node_find(msg_prevnode(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100405 u32 next_in;
406 u32 seqno;
407 struct sk_buff *deferred;
408
409 msg_dbg(msg, "<BC<<<");
410
Per Liden4323add2006-01-18 00:38:21 +0100411 if (unlikely(!node || !tipc_node_is_up(node) || !node->bclink.supported ||
Per Lidenb97bf3f2006-01-02 19:04:38 +0100412 (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) {
Per Liden4323add2006-01-18 00:38:21 +0100420 tipc_node_lock(node);
421 tipc_bclink_acknowledge(node, msg_bcast_ack(msg));
422 tipc_node_unlock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100423 bcl->stats.recv_nacks++;
424 bclink_retransmit_pkt(msg_bcgap_after(msg),
425 msg_bcgap_to(msg));
426 } else {
Per Liden4323add2006-01-18 00:38:21 +0100427 tipc_bclink_peek_nack(msg_destnode(msg),
Adrian Bunk988f0882006-03-20 22:37:52 -0800428 msg_bcast_tag(msg),
429 msg_bcgap_after(msg),
430 msg_bcgap_to(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100431 }
432 buf_discard(buf);
433 return;
434 }
435
Per Liden4323add2006-01-18 00:38:21 +0100436 tipc_node_lock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100437receive:
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))) {
Per Liden4323add2006-01-18 00:38:21 +0100451 tipc_node_unlock(node);
452 tipc_port_recv_mcast(buf, NULL);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100453 } else if (msg_user(msg) == MSG_BUNDLER) {
454 bcl->stats.recv_bundles++;
455 bcl->stats.recv_bundled += msg_msgcnt(msg);
Per Liden4323add2006-01-18 00:38:21 +0100456 tipc_node_unlock(node);
457 tipc_link_recv_bundle(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100458 } else if (msg_user(msg) == MSG_FRAGMENTER) {
459 bcl->stats.recv_fragments++;
Per Liden4323add2006-01-18 00:38:21 +0100460 if (tipc_link_recv_fragment(&node->bclink.defragm,
461 &buf, &msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100462 bcl->stats.recv_fragmented++;
Per Liden4323add2006-01-18 00:38:21 +0100463 tipc_node_unlock(node);
464 tipc_net_route_msg(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100465 } else {
Per Liden4323add2006-01-18 00:38:21 +0100466 tipc_node_unlock(node);
467 tipc_net_route_msg(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100468 }
469 if (deferred && (buf_seqno(deferred) == mod(next_in + 1))) {
Per Liden4323add2006-01-18 00:38:21 +0100470 tipc_node_lock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100471 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
Per Liden4323add2006-01-18 00:38:21 +0100481 if (tipc_link_defer_pkt(&node->bclink.deferred_head,
482 &node->bclink.deferred_tail,
483 buf)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100484 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 }
Per Liden4323add2006-01-18 00:38:21 +0100500 tipc_node_unlock(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100501}
502
Per Liden4323add2006-01-18 00:38:21 +0100503u32 tipc_bclink_get_last_sent(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100504{
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
Per Liden4323add2006-01-18 00:38:21 +0100512u32 tipc_bclink_acks_missing(struct node *n_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100513{
514 return (n_ptr->bclink.supported &&
Per Liden4323add2006-01-18 00:38:21 +0100515 (tipc_bclink_get_last_sent() != n_ptr->bclink.acked));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100516}
517
518
519/**
Per Liden4323add2006-01-18 00:38:21 +0100520 * tipc_bcbearer_send - send a packet through the broadcast pseudo-bearer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100521 *
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
Adrian Bunk988f0882006-03-20 22:37:52 -0800528static int tipc_bcbearer_send(struct sk_buff *buf,
529 struct tipc_bearer *unused1,
530 struct tipc_media_addr *unused2)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100531{
532 static int send_count = 0;
533
Per Lidende70c5b2006-03-20 22:38:14 -0800534 struct node_map *remains;
535 struct node_map *remains_new;
536 struct node_map *remains_tmp;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100537 int bp_index;
538 int swap_time;
Per Lidende70c5b2006-03-20 22:38:14 -0800539 int err;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100540
541 /* Prepare buffer for broadcasting (if first time trying to send it) */
542
543 if (likely(!msg_non_seq(buf_msg(buf)))) {
544 struct tipc_msg *msg;
545
Per Liden4323add2006-01-18 00:38:21 +0100546 assert(tipc_cltr_bcast_nodes.count != 0);
547 bcbuf_set_acks(buf, tipc_cltr_bcast_nodes.count);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100548 msg = buf_msg(buf);
549 msg_set_non_seq(msg);
550 msg_set_mc_netid(msg, tipc_net_id);
551 }
552
553 /* Determine if bearer pairs should be swapped following this attempt */
554
555 if ((swap_time = (++send_count >= 10)))
556 send_count = 0;
557
558 /* Send buffer over bearers until all targets reached */
559
Per Lidende70c5b2006-03-20 22:38:14 -0800560 remains = kmalloc(sizeof(struct node_map), GFP_ATOMIC);
561 remains_new = kmalloc(sizeof(struct node_map), GFP_ATOMIC);
562 *remains = tipc_cltr_bcast_nodes;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100563
564 for (bp_index = 0; bp_index < MAX_BEARERS; bp_index++) {
565 struct bearer *p = bcbearer->bpairs[bp_index].primary;
566 struct bearer *s = bcbearer->bpairs[bp_index].secondary;
567
568 if (!p)
569 break; /* no more bearers to try */
570
Per Lidende70c5b2006-03-20 22:38:14 -0800571 tipc_nmap_diff(remains, &p->nodes, remains_new);
572 if (remains_new->count == remains->count)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100573 continue; /* bearer pair doesn't add anything */
574
575 if (!p->publ.blocked &&
576 !p->media->send_msg(buf, &p->publ, &p->media->bcast_addr)) {
577 if (swap_time && s && !s->publ.blocked)
578 goto swap;
579 else
580 goto update;
581 }
582
583 if (!s || s->publ.blocked ||
584 s->media->send_msg(buf, &s->publ, &s->media->bcast_addr))
585 continue; /* unable to send using bearer pair */
586swap:
587 bcbearer->bpairs[bp_index].primary = s;
588 bcbearer->bpairs[bp_index].secondary = p;
589update:
Per Lidende70c5b2006-03-20 22:38:14 -0800590 if (remains_new->count == 0) {
591 err = TIPC_OK;
592 goto out;
593 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100594
Per Lidende70c5b2006-03-20 22:38:14 -0800595 /* swap map */
596 remains_tmp = remains;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100597 remains = remains_new;
Per Lidende70c5b2006-03-20 22:38:14 -0800598 remains_new = remains_tmp;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100599 }
600
601 /* Unable to reach all targets */
602
603 bcbearer->bearer.publ.blocked = 1;
604 bcl->stats.bearer_congs++;
Per Lidende70c5b2006-03-20 22:38:14 -0800605 err = ~TIPC_OK;
606
607 out:
608 kfree(remains_new);
609 kfree(remains);
610 return err;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100611}
612
613/**
Per Liden4323add2006-01-18 00:38:21 +0100614 * tipc_bcbearer_sort - create sets of bearer pairs used by broadcast bearer
Per Lidenb97bf3f2006-01-02 19:04:38 +0100615 */
616
Per Liden4323add2006-01-18 00:38:21 +0100617void tipc_bcbearer_sort(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100618{
619 struct bcbearer_pair *bp_temp = bcbearer->bpairs_temp;
620 struct bcbearer_pair *bp_curr;
621 int b_index;
622 int pri;
623
624 spin_lock_bh(&bc_lock);
625
626 /* Group bearers by priority (can assume max of two per priority) */
627
628 memset(bp_temp, 0, sizeof(bcbearer->bpairs_temp));
629
630 for (b_index = 0; b_index < MAX_BEARERS; b_index++) {
Per Liden4323add2006-01-18 00:38:21 +0100631 struct bearer *b = &tipc_bearers[b_index];
Per Lidenb97bf3f2006-01-02 19:04:38 +0100632
633 if (!b->active || !b->nodes.count)
634 continue;
635
636 if (!bp_temp[b->priority].primary)
637 bp_temp[b->priority].primary = b;
638 else
639 bp_temp[b->priority].secondary = b;
640 }
641
642 /* Create array of bearer pairs for broadcasting */
643
644 bp_curr = bcbearer->bpairs;
645 memset(bcbearer->bpairs, 0, sizeof(bcbearer->bpairs));
646
Per Liden16cb4b32006-01-13 22:22:22 +0100647 for (pri = TIPC_MAX_LINK_PRI; pri >= 0; pri--) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100648
649 if (!bp_temp[pri].primary)
650 continue;
651
652 bp_curr->primary = bp_temp[pri].primary;
653
654 if (bp_temp[pri].secondary) {
Per Liden4323add2006-01-18 00:38:21 +0100655 if (tipc_nmap_equal(&bp_temp[pri].primary->nodes,
656 &bp_temp[pri].secondary->nodes)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100657 bp_curr->secondary = bp_temp[pri].secondary;
658 } else {
659 bp_curr++;
660 bp_curr->primary = bp_temp[pri].secondary;
661 }
662 }
663
664 bp_curr++;
665 }
666
667 spin_unlock_bh(&bc_lock);
668}
669
670/**
Per Liden4323add2006-01-18 00:38:21 +0100671 * tipc_bcbearer_push - resolve bearer congestion
Per Lidenb97bf3f2006-01-02 19:04:38 +0100672 *
673 * Forces bclink to push out any unsent packets, until all packets are gone
674 * or congestion reoccurs.
675 * No locks set when function called
676 */
677
Per Liden4323add2006-01-18 00:38:21 +0100678void tipc_bcbearer_push(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100679{
680 struct bearer *b_ptr;
681
682 spin_lock_bh(&bc_lock);
683 b_ptr = &bcbearer->bearer;
684 if (b_ptr->publ.blocked) {
685 b_ptr->publ.blocked = 0;
Per Liden4323add2006-01-18 00:38:21 +0100686 tipc_bearer_lock_push(b_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100687 }
688 spin_unlock_bh(&bc_lock);
689}
690
691
Per Liden4323add2006-01-18 00:38:21 +0100692int tipc_bclink_stats(char *buf, const u32 buf_size)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100693{
694 struct print_buf pb;
695
696 if (!bcl)
697 return 0;
698
Per Liden4323add2006-01-18 00:38:21 +0100699 tipc_printbuf_init(&pb, buf, buf_size);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100700
701 spin_lock_bh(&bc_lock);
702
703 tipc_printf(&pb, "Link <%s>\n"
704 " Window:%u packets\n",
705 bcl->name, bcl->queue_limit[0]);
706 tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
707 bcl->stats.recv_info,
708 bcl->stats.recv_fragments,
709 bcl->stats.recv_fragmented,
710 bcl->stats.recv_bundles,
711 bcl->stats.recv_bundled);
712 tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
713 bcl->stats.sent_info,
714 bcl->stats.sent_fragments,
715 bcl->stats.sent_fragmented,
716 bcl->stats.sent_bundles,
717 bcl->stats.sent_bundled);
718 tipc_printf(&pb, " RX naks:%u defs:%u dups:%u\n",
719 bcl->stats.recv_nacks,
720 bcl->stats.deferred_recv,
721 bcl->stats.duplicates);
722 tipc_printf(&pb, " TX naks:%u acks:%u dups:%u\n",
723 bcl->stats.sent_nacks,
724 bcl->stats.sent_acks,
725 bcl->stats.retransmitted);
726 tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n",
727 bcl->stats.bearer_congs,
728 bcl->stats.link_congs,
729 bcl->stats.max_queue_sz,
730 bcl->stats.queue_sz_counts
731 ? (bcl->stats.accu_queue_sz / bcl->stats.queue_sz_counts)
732 : 0);
733
734 spin_unlock_bh(&bc_lock);
Per Liden4323add2006-01-18 00:38:21 +0100735 return tipc_printbuf_validate(&pb);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100736}
737
Per Liden4323add2006-01-18 00:38:21 +0100738int tipc_bclink_reset_stats(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100739{
740 if (!bcl)
741 return -ENOPROTOOPT;
742
743 spin_lock_bh(&bc_lock);
744 memset(&bcl->stats, 0, sizeof(bcl->stats));
745 spin_unlock_bh(&bc_lock);
746 return TIPC_OK;
747}
748
Per Liden4323add2006-01-18 00:38:21 +0100749int tipc_bclink_set_queue_limits(u32 limit)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100750{
751 if (!bcl)
752 return -ENOPROTOOPT;
753 if ((limit < TIPC_MIN_LINK_WIN) || (limit > TIPC_MAX_LINK_WIN))
754 return -EINVAL;
755
756 spin_lock_bh(&bc_lock);
Per Liden4323add2006-01-18 00:38:21 +0100757 tipc_link_set_queue_limits(bcl, limit);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100758 spin_unlock_bh(&bc_lock);
759 return TIPC_OK;
760}
761
Per Liden4323add2006-01-18 00:38:21 +0100762int tipc_bclink_init(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100763{
764 bcbearer = kmalloc(sizeof(*bcbearer), GFP_ATOMIC);
765 bclink = kmalloc(sizeof(*bclink), GFP_ATOMIC);
766 if (!bcbearer || !bclink) {
767 nomem:
768 warn("Memory squeeze; Failed to create multicast link\n");
769 kfree(bcbearer);
770 bcbearer = NULL;
771 kfree(bclink);
772 bclink = NULL;
773 return -ENOMEM;
774 }
775
776 memset(bcbearer, 0, sizeof(struct bcbearer));
777 INIT_LIST_HEAD(&bcbearer->bearer.cong_links);
778 bcbearer->bearer.media = &bcbearer->media;
Per Liden4323add2006-01-18 00:38:21 +0100779 bcbearer->media.send_msg = tipc_bcbearer_send;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100780 sprintf(bcbearer->media.name, "tipc-multicast");
781
782 bcl = &bclink->link;
783 memset(bclink, 0, sizeof(struct bclink));
784 INIT_LIST_HEAD(&bcl->waiting_ports);
785 bcl->next_out_no = 1;
786 bclink->node.lock = SPIN_LOCK_UNLOCKED;
787 bcl->owner = &bclink->node;
788 bcl->max_pkt = MAX_PKT_DEFAULT_MCAST;
Per Liden4323add2006-01-18 00:38:21 +0100789 tipc_link_set_queue_limits(bcl, BCLINK_WIN_DEFAULT);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100790 bcl->b_ptr = &bcbearer->bearer;
791 bcl->state = WORKING_WORKING;
Per Liden4323add2006-01-18 00:38:21 +0100792 sprintf(bcl->name, tipc_bclink_name);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100793
794 if (BCLINK_LOG_BUF_SIZE) {
795 char *pb = kmalloc(BCLINK_LOG_BUF_SIZE, GFP_ATOMIC);
796
797 if (!pb)
798 goto nomem;
Per Liden4323add2006-01-18 00:38:21 +0100799 tipc_printbuf_init(&bcl->print_buf, pb, BCLINK_LOG_BUF_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100800 }
801
802 return TIPC_OK;
803}
804
Per Liden4323add2006-01-18 00:38:21 +0100805void tipc_bclink_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100806{
807 spin_lock_bh(&bc_lock);
808 if (bcbearer) {
Per Liden4323add2006-01-18 00:38:21 +0100809 tipc_link_stop(bcl);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100810 if (BCLINK_LOG_BUF_SIZE)
811 kfree(bcl->print_buf.buf);
812 bcl = NULL;
813 kfree(bclink);
814 bclink = NULL;
815 kfree(bcbearer);
816 bcbearer = NULL;
817 }
818 spin_unlock_bh(&bc_lock);
819}
820