Commit | Line | Data |
---|---|---|
b97bf3fd PL |
1 | /* |
2 | * net/tipc/bcast.c: TIPC broadcast code | |
c4307285 | 3 | * |
593a5f22 | 4 | * Copyright (c) 2004-2006, Ericsson AB |
b97bf3fd PL |
5 | * Copyright (c) 2004, Intel Corporation. |
6 | * Copyright (c) 2005, Wind River Systems | |
b97bf3fd PL |
7 | * All rights reserved. |
8 | * | |
9ea1fd3c | 9 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
10 | * modification, are permitted provided that the following conditions are met: |
11 | * | |
9ea1fd3c PL |
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. | |
b97bf3fd | 20 | * |
9ea1fd3c PL |
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 | |
b97bf3fd PL |
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 | ||
b97bf3fd PL |
52 | #define MAX_PKT_DEFAULT_MCAST 1500 /* bcast link max packet size (fixed) */ |
53 | ||
54 | #define BCLINK_WIN_DEFAULT 20 /* bcast link window size (default) */ | |
55 | ||
56 | #define BCLINK_LOG_BUF_SIZE 0 | |
57 | ||
d356eeba AS |
58 | /* |
59 | * Loss rate for incoming broadcast frames; used to test retransmission code. | |
60 | * Set to N to cause every N'th frame to be discarded; 0 => don't discard any. | |
61 | */ | |
c4307285 | 62 | |
d356eeba AS |
63 | #define TIPC_BCAST_LOSS_RATE 0 |
64 | ||
b97bf3fd PL |
65 | /** |
66 | * struct bcbearer_pair - a pair of bearers used by broadcast link | |
67 | * @primary: pointer to primary bearer | |
68 | * @secondary: pointer to secondary bearer | |
c4307285 YH |
69 | * |
70 | * Bearers must have same priority and same set of reachable destinations | |
b97bf3fd PL |
71 | * to be paired. |
72 | */ | |
73 | ||
74 | struct bcbearer_pair { | |
75 | struct bearer *primary; | |
76 | struct bearer *secondary; | |
77 | }; | |
78 | ||
79 | /** | |
80 | * struct bcbearer - bearer used by broadcast link | |
81 | * @bearer: (non-standard) broadcast bearer structure | |
82 | * @media: (non-standard) broadcast media structure | |
83 | * @bpairs: array of bearer pairs | |
65f51ef0 AS |
84 | * @bpairs_temp: temporary array of bearer pairs used by tipc_bcbearer_sort() |
85 | * @remains: temporary node map used by tipc_bcbearer_send() | |
86 | * @remains_new: temporary node map used tipc_bcbearer_send() | |
c4307285 | 87 | * |
65f51ef0 AS |
88 | * Note: The fields labelled "temporary" are incorporated into the bearer |
89 | * to avoid consuming potentially limited stack space through the use of | |
90 | * large local variables within multicast routines. Concurrent access is | |
91 | * prevented through use of the spinlock "bc_lock". | |
b97bf3fd PL |
92 | */ |
93 | ||
94 | struct bcbearer { | |
95 | struct bearer bearer; | |
96 | struct media media; | |
97 | struct bcbearer_pair bpairs[MAX_BEARERS]; | |
16cb4b33 | 98 | struct bcbearer_pair bpairs_temp[TIPC_MAX_LINK_PRI + 1]; |
6c00055a DM |
99 | struct tipc_node_map remains; |
100 | struct tipc_node_map remains_new; | |
b97bf3fd PL |
101 | }; |
102 | ||
103 | /** | |
104 | * struct bclink - link used for broadcast messages | |
105 | * @link: (non-standard) broadcast link structure | |
106 | * @node: (non-standard) node structure representing b'cast link's peer node | |
c4307285 | 107 | * |
b97bf3fd PL |
108 | * Handles sequence numbering, fragmentation, bundling, etc. |
109 | */ | |
110 | ||
111 | struct bclink { | |
112 | struct link link; | |
6c00055a | 113 | struct tipc_node node; |
b97bf3fd PL |
114 | }; |
115 | ||
116 | ||
117 | static struct bcbearer *bcbearer = NULL; | |
118 | static struct bclink *bclink = NULL; | |
119 | static struct link *bcl = NULL; | |
34af946a | 120 | static DEFINE_SPINLOCK(bc_lock); |
b97bf3fd | 121 | |
3aec9cc9 | 122 | const char tipc_bclink_name[] = "broadcast-link"; |
b97bf3fd | 123 | |
31e3c3f6 | 124 | static void tipc_nmap_diff(struct tipc_node_map *nm_a, |
125 | struct tipc_node_map *nm_b, | |
126 | struct tipc_node_map *nm_diff); | |
b97bf3fd | 127 | |
05790c64 | 128 | static u32 buf_seqno(struct sk_buff *buf) |
b97bf3fd PL |
129 | { |
130 | return msg_seqno(buf_msg(buf)); | |
c4307285 | 131 | } |
b97bf3fd | 132 | |
05790c64 | 133 | static u32 bcbuf_acks(struct sk_buff *buf) |
b97bf3fd | 134 | { |
880b005f | 135 | return (u32)(unsigned long)TIPC_SKB_CB(buf)->handle; |
b97bf3fd PL |
136 | } |
137 | ||
05790c64 | 138 | static void bcbuf_set_acks(struct sk_buff *buf, u32 acks) |
b97bf3fd | 139 | { |
880b005f | 140 | TIPC_SKB_CB(buf)->handle = (void *)(unsigned long)acks; |
b97bf3fd PL |
141 | } |
142 | ||
05790c64 | 143 | static void bcbuf_decr_acks(struct sk_buff *buf) |
b97bf3fd PL |
144 | { |
145 | bcbuf_set_acks(buf, bcbuf_acks(buf) - 1); | |
146 | } | |
147 | ||
148 | ||
5b1f7bde AS |
149 | static void bclink_set_last_sent(void) |
150 | { | |
151 | if (bcl->next_out) | |
152 | bcl->fsm_msg_cnt = mod(buf_seqno(bcl->next_out) - 1); | |
153 | else | |
154 | bcl->fsm_msg_cnt = mod(bcl->next_out_no - 1); | |
155 | } | |
156 | ||
157 | u32 tipc_bclink_get_last_sent(void) | |
158 | { | |
159 | return bcl->fsm_msg_cnt; | |
160 | } | |
161 | ||
c4307285 | 162 | /** |
b97bf3fd | 163 | * bclink_set_gap - set gap according to contents of current deferred pkt queue |
c4307285 | 164 | * |
b97bf3fd PL |
165 | * Called with 'node' locked, bc_lock unlocked |
166 | */ | |
167 | ||
6c00055a | 168 | static void bclink_set_gap(struct tipc_node *n_ptr) |
b97bf3fd PL |
169 | { |
170 | struct sk_buff *buf = n_ptr->bclink.deferred_head; | |
171 | ||
172 | n_ptr->bclink.gap_after = n_ptr->bclink.gap_to = | |
173 | mod(n_ptr->bclink.last_in); | |
174 | if (unlikely(buf != NULL)) | |
175 | n_ptr->bclink.gap_to = mod(buf_seqno(buf) - 1); | |
176 | } | |
177 | ||
c4307285 | 178 | /** |
b97bf3fd | 179 | * bclink_ack_allowed - test if ACK or NACK message can be sent at this moment |
c4307285 | 180 | * |
b97bf3fd PL |
181 | * This mechanism endeavours to prevent all nodes in network from trying |
182 | * to ACK or NACK at the same time. | |
c4307285 | 183 | * |
b97bf3fd | 184 | * Note: TIPC uses a different trigger to distribute ACKs than it does to |
c4307285 | 185 | * distribute NACKs, but tries to use the same spacing (divide by 16). |
b97bf3fd PL |
186 | */ |
187 | ||
05790c64 | 188 | static int bclink_ack_allowed(u32 n) |
b97bf3fd | 189 | { |
a02cec21 | 190 | return (n % TIPC_MIN_LINK_WIN) == tipc_own_tag; |
b97bf3fd PL |
191 | } |
192 | ||
193 | ||
c4307285 | 194 | /** |
b97bf3fd PL |
195 | * bclink_retransmit_pkt - retransmit broadcast packets |
196 | * @after: sequence number of last packet to *not* retransmit | |
197 | * @to: sequence number of last packet to retransmit | |
c4307285 | 198 | * |
d356eeba | 199 | * Called with bc_lock locked |
b97bf3fd PL |
200 | */ |
201 | ||
202 | static void bclink_retransmit_pkt(u32 after, u32 to) | |
203 | { | |
204 | struct sk_buff *buf; | |
205 | ||
b97bf3fd PL |
206 | buf = bcl->first_out; |
207 | while (buf && less_eq(buf_seqno(buf), after)) { | |
c4307285 | 208 | buf = buf->next; |
b97bf3fd | 209 | } |
d356eeba | 210 | tipc_link_retransmit(bcl, buf, mod(to - after)); |
b97bf3fd PL |
211 | } |
212 | ||
c4307285 | 213 | /** |
4323add6 | 214 | * tipc_bclink_acknowledge - handle acknowledgement of broadcast packets |
b97bf3fd PL |
215 | * @n_ptr: node that sent acknowledgement info |
216 | * @acked: broadcast sequence # that has been acknowledged | |
c4307285 | 217 | * |
b97bf3fd PL |
218 | * Node is locked, bc_lock unlocked. |
219 | */ | |
220 | ||
6c00055a | 221 | void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked) |
b97bf3fd PL |
222 | { |
223 | struct sk_buff *crs; | |
224 | struct sk_buff *next; | |
225 | unsigned int released = 0; | |
226 | ||
227 | if (less_eq(acked, n_ptr->bclink.acked)) | |
228 | return; | |
229 | ||
230 | spin_lock_bh(&bc_lock); | |
231 | ||
232 | /* Skip over packets that node has previously acknowledged */ | |
233 | ||
234 | crs = bcl->first_out; | |
235 | while (crs && less_eq(buf_seqno(crs), n_ptr->bclink.acked)) { | |
236 | crs = crs->next; | |
237 | } | |
238 | ||
239 | /* Update packets that node is now acknowledging */ | |
240 | ||
241 | while (crs && less_eq(buf_seqno(crs), acked)) { | |
242 | next = crs->next; | |
243 | bcbuf_decr_acks(crs); | |
244 | if (bcbuf_acks(crs) == 0) { | |
245 | bcl->first_out = next; | |
246 | bcl->out_queue_size--; | |
247 | buf_discard(crs); | |
248 | released = 1; | |
249 | } | |
250 | crs = next; | |
251 | } | |
252 | n_ptr->bclink.acked = acked; | |
253 | ||
254 | /* Try resolving broadcast link congestion, if necessary */ | |
255 | ||
5b1f7bde | 256 | if (unlikely(bcl->next_out)) { |
4323add6 | 257 | tipc_link_push_queue(bcl); |
5b1f7bde AS |
258 | bclink_set_last_sent(); |
259 | } | |
b97bf3fd | 260 | if (unlikely(released && !list_empty(&bcl->waiting_ports))) |
4323add6 | 261 | tipc_link_wakeup_ports(bcl, 0); |
b97bf3fd PL |
262 | spin_unlock_bh(&bc_lock); |
263 | } | |
264 | ||
c4307285 | 265 | /** |
b97bf3fd | 266 | * bclink_send_ack - unicast an ACK msg |
c4307285 | 267 | * |
4323add6 | 268 | * tipc_net_lock and node lock set |
b97bf3fd PL |
269 | */ |
270 | ||
6c00055a | 271 | static void bclink_send_ack(struct tipc_node *n_ptr) |
b97bf3fd PL |
272 | { |
273 | struct link *l_ptr = n_ptr->active_links[n_ptr->addr & 1]; | |
274 | ||
275 | if (l_ptr != NULL) | |
4323add6 | 276 | tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); |
b97bf3fd PL |
277 | } |
278 | ||
c4307285 | 279 | /** |
b97bf3fd | 280 | * bclink_send_nack- broadcast a NACK msg |
c4307285 | 281 | * |
4323add6 | 282 | * tipc_net_lock and node lock set |
b97bf3fd PL |
283 | */ |
284 | ||
6c00055a | 285 | static void bclink_send_nack(struct tipc_node *n_ptr) |
b97bf3fd PL |
286 | { |
287 | struct sk_buff *buf; | |
288 | struct tipc_msg *msg; | |
289 | ||
290 | if (!less(n_ptr->bclink.gap_after, n_ptr->bclink.gap_to)) | |
291 | return; | |
292 | ||
31e3c3f6 | 293 | buf = tipc_buf_acquire(INT_H_SIZE); |
b97bf3fd PL |
294 | if (buf) { |
295 | msg = buf_msg(buf); | |
c68ca7b7 | 296 | tipc_msg_init(msg, BCAST_PROTOCOL, STATE_MSG, |
75715217 | 297 | INT_H_SIZE, n_ptr->addr); |
b97bf3fd | 298 | msg_set_mc_netid(msg, tipc_net_id); |
c4307285 | 299 | msg_set_bcast_ack(msg, mod(n_ptr->bclink.last_in)); |
b97bf3fd PL |
300 | msg_set_bcgap_after(msg, n_ptr->bclink.gap_after); |
301 | msg_set_bcgap_to(msg, n_ptr->bclink.gap_to); | |
302 | msg_set_bcast_tag(msg, tipc_own_tag); | |
303 | ||
1fc54d8f | 304 | if (tipc_bearer_send(&bcbearer->bearer, buf, NULL)) { |
b97bf3fd PL |
305 | bcl->stats.sent_nacks++; |
306 | buf_discard(buf); | |
307 | } else { | |
4323add6 | 308 | tipc_bearer_schedule(bcl->b_ptr, bcl); |
b97bf3fd PL |
309 | bcl->proto_msg_queue = buf; |
310 | bcl->stats.bearer_congs++; | |
311 | } | |
312 | ||
c4307285 | 313 | /* |
b97bf3fd PL |
314 | * Ensure we doesn't send another NACK msg to the node |
315 | * until 16 more deferred messages arrive from it | |
316 | * (i.e. helps prevent all nodes from NACK'ing at same time) | |
317 | */ | |
c4307285 | 318 | |
b97bf3fd PL |
319 | n_ptr->bclink.nack_sync = tipc_own_tag; |
320 | } | |
321 | } | |
322 | ||
c4307285 | 323 | /** |
4323add6 | 324 | * tipc_bclink_check_gap - send a NACK if a sequence gap exists |
b97bf3fd | 325 | * |
4323add6 | 326 | * tipc_net_lock and node lock set |
b97bf3fd PL |
327 | */ |
328 | ||
6c00055a | 329 | void tipc_bclink_check_gap(struct tipc_node *n_ptr, u32 last_sent) |
b97bf3fd PL |
330 | { |
331 | if (!n_ptr->bclink.supported || | |
332 | less_eq(last_sent, mod(n_ptr->bclink.last_in))) | |
333 | return; | |
334 | ||
335 | bclink_set_gap(n_ptr); | |
336 | if (n_ptr->bclink.gap_after == n_ptr->bclink.gap_to) | |
337 | n_ptr->bclink.gap_to = last_sent; | |
338 | bclink_send_nack(n_ptr); | |
339 | } | |
340 | ||
c4307285 | 341 | /** |
4323add6 | 342 | * tipc_bclink_peek_nack - process a NACK msg meant for another node |
c4307285 | 343 | * |
4323add6 | 344 | * Only tipc_net_lock set. |
b97bf3fd PL |
345 | */ |
346 | ||
988f088a | 347 | static void tipc_bclink_peek_nack(u32 dest, u32 sender_tag, u32 gap_after, u32 gap_to) |
b97bf3fd | 348 | { |
6c00055a | 349 | struct tipc_node *n_ptr = tipc_node_find(dest); |
b97bf3fd PL |
350 | u32 my_after, my_to; |
351 | ||
4323add6 | 352 | if (unlikely(!n_ptr || !tipc_node_is_up(n_ptr))) |
b97bf3fd | 353 | return; |
4323add6 | 354 | tipc_node_lock(n_ptr); |
b97bf3fd PL |
355 | /* |
356 | * Modify gap to suppress unnecessary NACKs from this node | |
357 | */ | |
358 | my_after = n_ptr->bclink.gap_after; | |
359 | my_to = n_ptr->bclink.gap_to; | |
360 | ||
361 | if (less_eq(gap_after, my_after)) { | |
362 | if (less(my_after, gap_to) && less(gap_to, my_to)) | |
363 | n_ptr->bclink.gap_after = gap_to; | |
364 | else if (less_eq(my_to, gap_to)) | |
365 | n_ptr->bclink.gap_to = n_ptr->bclink.gap_after; | |
366 | } else if (less_eq(gap_after, my_to)) { | |
367 | if (less_eq(my_to, gap_to)) | |
368 | n_ptr->bclink.gap_to = gap_after; | |
369 | } else { | |
c4307285 | 370 | /* |
b97bf3fd PL |
371 | * Expand gap if missing bufs not in deferred queue: |
372 | */ | |
373 | struct sk_buff *buf = n_ptr->bclink.deferred_head; | |
374 | u32 prev = n_ptr->bclink.gap_to; | |
375 | ||
376 | for (; buf; buf = buf->next) { | |
377 | u32 seqno = buf_seqno(buf); | |
378 | ||
3ac90216 | 379 | if (mod(seqno - prev) != 1) { |
b97bf3fd | 380 | buf = NULL; |
3ac90216 ES |
381 | break; |
382 | } | |
b97bf3fd PL |
383 | if (seqno == gap_after) |
384 | break; | |
385 | prev = seqno; | |
386 | } | |
387 | if (buf == NULL) | |
388 | n_ptr->bclink.gap_to = gap_after; | |
389 | } | |
390 | /* | |
391 | * Some nodes may send a complementary NACK now: | |
c4307285 | 392 | */ |
b97bf3fd PL |
393 | if (bclink_ack_allowed(sender_tag + 1)) { |
394 | if (n_ptr->bclink.gap_to != n_ptr->bclink.gap_after) { | |
395 | bclink_send_nack(n_ptr); | |
396 | bclink_set_gap(n_ptr); | |
397 | } | |
398 | } | |
4323add6 | 399 | tipc_node_unlock(n_ptr); |
b97bf3fd PL |
400 | } |
401 | ||
402 | /** | |
4323add6 | 403 | * tipc_bclink_send_msg - broadcast a packet to all nodes in cluster |
b97bf3fd PL |
404 | */ |
405 | ||
4323add6 | 406 | int tipc_bclink_send_msg(struct sk_buff *buf) |
b97bf3fd PL |
407 | { |
408 | int res; | |
409 | ||
410 | spin_lock_bh(&bc_lock); | |
411 | ||
4323add6 | 412 | res = tipc_link_send_buf(bcl, buf); |
b97bf3fd PL |
413 | if (unlikely(res == -ELINKCONG)) |
414 | buf_discard(buf); | |
0048b826 | 415 | else |
5b1f7bde | 416 | bclink_set_last_sent(); |
b97bf3fd PL |
417 | |
418 | if (bcl->out_queue_size > bcl->stats.max_queue_sz) | |
419 | bcl->stats.max_queue_sz = bcl->out_queue_size; | |
420 | bcl->stats.queue_sz_counts++; | |
421 | bcl->stats.accu_queue_sz += bcl->out_queue_size; | |
422 | ||
423 | spin_unlock_bh(&bc_lock); | |
424 | return res; | |
425 | } | |
426 | ||
427 | /** | |
4323add6 | 428 | * tipc_bclink_recv_pkt - receive a broadcast packet, and deliver upwards |
c4307285 | 429 | * |
4323add6 | 430 | * tipc_net_lock is read_locked, no other locks set |
b97bf3fd PL |
431 | */ |
432 | ||
4323add6 | 433 | void tipc_bclink_recv_pkt(struct sk_buff *buf) |
d356eeba AS |
434 | { |
435 | #if (TIPC_BCAST_LOSS_RATE) | |
436 | static int rx_count = 0; | |
437 | #endif | |
b97bf3fd | 438 | struct tipc_msg *msg = buf_msg(buf); |
6c00055a | 439 | struct tipc_node* node = tipc_node_find(msg_prevnode(msg)); |
b97bf3fd PL |
440 | u32 next_in; |
441 | u32 seqno; | |
442 | struct sk_buff *deferred; | |
443 | ||
444 | msg_dbg(msg, "<BC<<<"); | |
445 | ||
c4307285 | 446 | if (unlikely(!node || !tipc_node_is_up(node) || !node->bclink.supported || |
b97bf3fd PL |
447 | (msg_mc_netid(msg) != tipc_net_id))) { |
448 | buf_discard(buf); | |
449 | return; | |
450 | } | |
451 | ||
452 | if (unlikely(msg_user(msg) == BCAST_PROTOCOL)) { | |
453 | msg_dbg(msg, "<BCNACK<<<"); | |
454 | if (msg_destnode(msg) == tipc_own_addr) { | |
4323add6 PL |
455 | tipc_node_lock(node); |
456 | tipc_bclink_acknowledge(node, msg_bcast_ack(msg)); | |
457 | tipc_node_unlock(node); | |
d356eeba | 458 | spin_lock_bh(&bc_lock); |
b97bf3fd | 459 | bcl->stats.recv_nacks++; |
d356eeba | 460 | bcl->owner->next = node; /* remember requestor */ |
b97bf3fd PL |
461 | bclink_retransmit_pkt(msg_bcgap_after(msg), |
462 | msg_bcgap_to(msg)); | |
d356eeba | 463 | bcl->owner->next = NULL; |
c4307285 | 464 | spin_unlock_bh(&bc_lock); |
b97bf3fd | 465 | } else { |
4323add6 | 466 | tipc_bclink_peek_nack(msg_destnode(msg), |
988f088a AB |
467 | msg_bcast_tag(msg), |
468 | msg_bcgap_after(msg), | |
469 | msg_bcgap_to(msg)); | |
b97bf3fd PL |
470 | } |
471 | buf_discard(buf); | |
472 | return; | |
473 | } | |
474 | ||
d356eeba AS |
475 | #if (TIPC_BCAST_LOSS_RATE) |
476 | if (++rx_count == TIPC_BCAST_LOSS_RATE) { | |
477 | rx_count = 0; | |
478 | buf_discard(buf); | |
479 | return; | |
480 | } | |
481 | #endif | |
482 | ||
4323add6 | 483 | tipc_node_lock(node); |
b97bf3fd PL |
484 | receive: |
485 | deferred = node->bclink.deferred_head; | |
486 | next_in = mod(node->bclink.last_in + 1); | |
487 | seqno = msg_seqno(msg); | |
488 | ||
489 | if (likely(seqno == next_in)) { | |
490 | bcl->stats.recv_info++; | |
491 | node->bclink.last_in++; | |
492 | bclink_set_gap(node); | |
493 | if (unlikely(bclink_ack_allowed(seqno))) { | |
494 | bclink_send_ack(node); | |
495 | bcl->stats.sent_acks++; | |
496 | } | |
497 | if (likely(msg_isdata(msg))) { | |
4323add6 PL |
498 | tipc_node_unlock(node); |
499 | tipc_port_recv_mcast(buf, NULL); | |
b97bf3fd PL |
500 | } else if (msg_user(msg) == MSG_BUNDLER) { |
501 | bcl->stats.recv_bundles++; | |
502 | bcl->stats.recv_bundled += msg_msgcnt(msg); | |
4323add6 PL |
503 | tipc_node_unlock(node); |
504 | tipc_link_recv_bundle(buf); | |
b97bf3fd PL |
505 | } else if (msg_user(msg) == MSG_FRAGMENTER) { |
506 | bcl->stats.recv_fragments++; | |
4323add6 PL |
507 | if (tipc_link_recv_fragment(&node->bclink.defragm, |
508 | &buf, &msg)) | |
b97bf3fd | 509 | bcl->stats.recv_fragmented++; |
4323add6 PL |
510 | tipc_node_unlock(node); |
511 | tipc_net_route_msg(buf); | |
b97bf3fd | 512 | } else { |
4323add6 PL |
513 | tipc_node_unlock(node); |
514 | tipc_net_route_msg(buf); | |
b97bf3fd PL |
515 | } |
516 | if (deferred && (buf_seqno(deferred) == mod(next_in + 1))) { | |
4323add6 | 517 | tipc_node_lock(node); |
b97bf3fd PL |
518 | buf = deferred; |
519 | msg = buf_msg(buf); | |
520 | node->bclink.deferred_head = deferred->next; | |
521 | goto receive; | |
522 | } | |
523 | return; | |
524 | } else if (less(next_in, seqno)) { | |
525 | u32 gap_after = node->bclink.gap_after; | |
526 | u32 gap_to = node->bclink.gap_to; | |
527 | ||
4323add6 PL |
528 | if (tipc_link_defer_pkt(&node->bclink.deferred_head, |
529 | &node->bclink.deferred_tail, | |
530 | buf)) { | |
b97bf3fd PL |
531 | node->bclink.nack_sync++; |
532 | bcl->stats.deferred_recv++; | |
533 | if (seqno == mod(gap_after + 1)) | |
534 | node->bclink.gap_after = seqno; | |
535 | else if (less(gap_after, seqno) && less(seqno, gap_to)) | |
536 | node->bclink.gap_to = seqno; | |
537 | } | |
538 | if (bclink_ack_allowed(node->bclink.nack_sync)) { | |
539 | if (gap_to != gap_after) | |
540 | bclink_send_nack(node); | |
541 | bclink_set_gap(node); | |
542 | } | |
543 | } else { | |
544 | bcl->stats.duplicates++; | |
545 | buf_discard(buf); | |
546 | } | |
4323add6 | 547 | tipc_node_unlock(node); |
b97bf3fd PL |
548 | } |
549 | ||
6c00055a | 550 | u32 tipc_bclink_acks_missing(struct tipc_node *n_ptr) |
b97bf3fd PL |
551 | { |
552 | return (n_ptr->bclink.supported && | |
4323add6 | 553 | (tipc_bclink_get_last_sent() != n_ptr->bclink.acked)); |
b97bf3fd PL |
554 | } |
555 | ||
556 | ||
557 | /** | |
4323add6 | 558 | * tipc_bcbearer_send - send a packet through the broadcast pseudo-bearer |
c4307285 | 559 | * |
b97bf3fd PL |
560 | * Send through as many bearers as necessary to reach all nodes |
561 | * that support TIPC multicasting. | |
c4307285 | 562 | * |
b97bf3fd PL |
563 | * Returns 0 if packet sent successfully, non-zero if not |
564 | */ | |
565 | ||
988f088a AB |
566 | static int tipc_bcbearer_send(struct sk_buff *buf, |
567 | struct tipc_bearer *unused1, | |
568 | struct tipc_media_addr *unused2) | |
b97bf3fd | 569 | { |
b97bf3fd | 570 | int bp_index; |
b97bf3fd PL |
571 | |
572 | /* Prepare buffer for broadcasting (if first time trying to send it) */ | |
573 | ||
574 | if (likely(!msg_non_seq(buf_msg(buf)))) { | |
575 | struct tipc_msg *msg; | |
576 | ||
4323add6 PL |
577 | assert(tipc_cltr_bcast_nodes.count != 0); |
578 | bcbuf_set_acks(buf, tipc_cltr_bcast_nodes.count); | |
b97bf3fd | 579 | msg = buf_msg(buf); |
40aecb1b | 580 | msg_set_non_seq(msg, 1); |
b97bf3fd | 581 | msg_set_mc_netid(msg, tipc_net_id); |
0048b826 | 582 | bcl->stats.sent_info++; |
b97bf3fd PL |
583 | } |
584 | ||
b97bf3fd | 585 | /* Send buffer over bearers until all targets reached */ |
c4307285 | 586 | |
65f51ef0 | 587 | bcbearer->remains = tipc_cltr_bcast_nodes; |
b97bf3fd PL |
588 | |
589 | for (bp_index = 0; bp_index < MAX_BEARERS; bp_index++) { | |
590 | struct bearer *p = bcbearer->bpairs[bp_index].primary; | |
591 | struct bearer *s = bcbearer->bpairs[bp_index].secondary; | |
592 | ||
593 | if (!p) | |
594 | break; /* no more bearers to try */ | |
595 | ||
65f51ef0 AS |
596 | tipc_nmap_diff(&bcbearer->remains, &p->nodes, &bcbearer->remains_new); |
597 | if (bcbearer->remains_new.count == bcbearer->remains.count) | |
b97bf3fd PL |
598 | continue; /* bearer pair doesn't add anything */ |
599 | ||
1a624832 NH |
600 | if (p->publ.blocked || |
601 | p->media->send_msg(buf, &p->publ, &p->media->bcast_addr)) { | |
602 | /* unable to send on primary bearer */ | |
603 | if (!s || s->publ.blocked || | |
604 | s->media->send_msg(buf, &s->publ, | |
605 | &s->media->bcast_addr)) { | |
606 | /* unable to send on either bearer */ | |
607 | continue; | |
608 | } | |
609 | } | |
610 | ||
611 | if (s) { | |
612 | bcbearer->bpairs[bp_index].primary = s; | |
613 | bcbearer->bpairs[bp_index].secondary = p; | |
b97bf3fd PL |
614 | } |
615 | ||
65f51ef0 | 616 | if (bcbearer->remains_new.count == 0) |
0e35fd5e | 617 | return 0; |
b97bf3fd | 618 | |
65f51ef0 | 619 | bcbearer->remains = bcbearer->remains_new; |
b97bf3fd | 620 | } |
c4307285 | 621 | |
7e3e5d09 AS |
622 | /* |
623 | * Unable to reach all targets (indicate success, since currently | |
624 | * there isn't code in place to properly block & unblock the | |
625 | * pseudo-bearer used by the broadcast link) | |
626 | */ | |
b97bf3fd | 627 | |
7e3e5d09 | 628 | return TIPC_OK; |
b97bf3fd PL |
629 | } |
630 | ||
631 | /** | |
4323add6 | 632 | * tipc_bcbearer_sort - create sets of bearer pairs used by broadcast bearer |
b97bf3fd PL |
633 | */ |
634 | ||
4323add6 | 635 | void tipc_bcbearer_sort(void) |
b97bf3fd PL |
636 | { |
637 | struct bcbearer_pair *bp_temp = bcbearer->bpairs_temp; | |
638 | struct bcbearer_pair *bp_curr; | |
639 | int b_index; | |
640 | int pri; | |
641 | ||
642 | spin_lock_bh(&bc_lock); | |
643 | ||
644 | /* Group bearers by priority (can assume max of two per priority) */ | |
645 | ||
646 | memset(bp_temp, 0, sizeof(bcbearer->bpairs_temp)); | |
647 | ||
648 | for (b_index = 0; b_index < MAX_BEARERS; b_index++) { | |
4323add6 | 649 | struct bearer *b = &tipc_bearers[b_index]; |
b97bf3fd PL |
650 | |
651 | if (!b->active || !b->nodes.count) | |
652 | continue; | |
653 | ||
654 | if (!bp_temp[b->priority].primary) | |
655 | bp_temp[b->priority].primary = b; | |
656 | else | |
657 | bp_temp[b->priority].secondary = b; | |
658 | } | |
659 | ||
660 | /* Create array of bearer pairs for broadcasting */ | |
661 | ||
662 | bp_curr = bcbearer->bpairs; | |
663 | memset(bcbearer->bpairs, 0, sizeof(bcbearer->bpairs)); | |
664 | ||
16cb4b33 | 665 | for (pri = TIPC_MAX_LINK_PRI; pri >= 0; pri--) { |
b97bf3fd PL |
666 | |
667 | if (!bp_temp[pri].primary) | |
668 | continue; | |
669 | ||
670 | bp_curr->primary = bp_temp[pri].primary; | |
671 | ||
672 | if (bp_temp[pri].secondary) { | |
4323add6 PL |
673 | if (tipc_nmap_equal(&bp_temp[pri].primary->nodes, |
674 | &bp_temp[pri].secondary->nodes)) { | |
b97bf3fd PL |
675 | bp_curr->secondary = bp_temp[pri].secondary; |
676 | } else { | |
677 | bp_curr++; | |
678 | bp_curr->primary = bp_temp[pri].secondary; | |
679 | } | |
680 | } | |
681 | ||
682 | bp_curr++; | |
683 | } | |
684 | ||
685 | spin_unlock_bh(&bc_lock); | |
686 | } | |
687 | ||
688 | /** | |
4323add6 | 689 | * tipc_bcbearer_push - resolve bearer congestion |
c4307285 | 690 | * |
b97bf3fd PL |
691 | * Forces bclink to push out any unsent packets, until all packets are gone |
692 | * or congestion reoccurs. | |
693 | * No locks set when function called | |
694 | */ | |
695 | ||
4323add6 | 696 | void tipc_bcbearer_push(void) |
b97bf3fd PL |
697 | { |
698 | struct bearer *b_ptr; | |
699 | ||
700 | spin_lock_bh(&bc_lock); | |
701 | b_ptr = &bcbearer->bearer; | |
702 | if (b_ptr->publ.blocked) { | |
703 | b_ptr->publ.blocked = 0; | |
4323add6 | 704 | tipc_bearer_lock_push(b_ptr); |
b97bf3fd PL |
705 | } |
706 | spin_unlock_bh(&bc_lock); | |
707 | } | |
708 | ||
709 | ||
4323add6 | 710 | int tipc_bclink_stats(char *buf, const u32 buf_size) |
b97bf3fd PL |
711 | { |
712 | struct print_buf pb; | |
713 | ||
714 | if (!bcl) | |
715 | return 0; | |
716 | ||
4323add6 | 717 | tipc_printbuf_init(&pb, buf, buf_size); |
b97bf3fd PL |
718 | |
719 | spin_lock_bh(&bc_lock); | |
720 | ||
721 | tipc_printf(&pb, "Link <%s>\n" | |
c4307285 | 722 | " Window:%u packets\n", |
b97bf3fd | 723 | bcl->name, bcl->queue_limit[0]); |
c4307285 | 724 | tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n", |
b97bf3fd PL |
725 | bcl->stats.recv_info, |
726 | bcl->stats.recv_fragments, | |
727 | bcl->stats.recv_fragmented, | |
728 | bcl->stats.recv_bundles, | |
729 | bcl->stats.recv_bundled); | |
c4307285 | 730 | tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n", |
b97bf3fd PL |
731 | bcl->stats.sent_info, |
732 | bcl->stats.sent_fragments, | |
c4307285 | 733 | bcl->stats.sent_fragmented, |
b97bf3fd PL |
734 | bcl->stats.sent_bundles, |
735 | bcl->stats.sent_bundled); | |
c4307285 | 736 | tipc_printf(&pb, " RX naks:%u defs:%u dups:%u\n", |
b97bf3fd | 737 | bcl->stats.recv_nacks, |
c4307285 | 738 | bcl->stats.deferred_recv, |
b97bf3fd | 739 | bcl->stats.duplicates); |
c4307285 YH |
740 | tipc_printf(&pb, " TX naks:%u acks:%u dups:%u\n", |
741 | bcl->stats.sent_nacks, | |
742 | bcl->stats.sent_acks, | |
b97bf3fd PL |
743 | bcl->stats.retransmitted); |
744 | tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n", | |
745 | bcl->stats.bearer_congs, | |
746 | bcl->stats.link_congs, | |
747 | bcl->stats.max_queue_sz, | |
748 | bcl->stats.queue_sz_counts | |
749 | ? (bcl->stats.accu_queue_sz / bcl->stats.queue_sz_counts) | |
750 | : 0); | |
751 | ||
752 | spin_unlock_bh(&bc_lock); | |
4323add6 | 753 | return tipc_printbuf_validate(&pb); |
b97bf3fd PL |
754 | } |
755 | ||
4323add6 | 756 | int tipc_bclink_reset_stats(void) |
b97bf3fd PL |
757 | { |
758 | if (!bcl) | |
759 | return -ENOPROTOOPT; | |
760 | ||
761 | spin_lock_bh(&bc_lock); | |
762 | memset(&bcl->stats, 0, sizeof(bcl->stats)); | |
763 | spin_unlock_bh(&bc_lock); | |
0e35fd5e | 764 | return 0; |
b97bf3fd PL |
765 | } |
766 | ||
4323add6 | 767 | int tipc_bclink_set_queue_limits(u32 limit) |
b97bf3fd PL |
768 | { |
769 | if (!bcl) | |
770 | return -ENOPROTOOPT; | |
771 | if ((limit < TIPC_MIN_LINK_WIN) || (limit > TIPC_MAX_LINK_WIN)) | |
772 | return -EINVAL; | |
773 | ||
774 | spin_lock_bh(&bc_lock); | |
4323add6 | 775 | tipc_link_set_queue_limits(bcl, limit); |
b97bf3fd | 776 | spin_unlock_bh(&bc_lock); |
0e35fd5e | 777 | return 0; |
b97bf3fd PL |
778 | } |
779 | ||
4323add6 | 780 | int tipc_bclink_init(void) |
b97bf3fd | 781 | { |
2710b57f ACM |
782 | bcbearer = kzalloc(sizeof(*bcbearer), GFP_ATOMIC); |
783 | bclink = kzalloc(sizeof(*bclink), GFP_ATOMIC); | |
b97bf3fd PL |
784 | if (!bcbearer || !bclink) { |
785 | nomem: | |
c4307285 | 786 | warn("Multicast link creation failed, no memory\n"); |
b97bf3fd PL |
787 | kfree(bcbearer); |
788 | bcbearer = NULL; | |
789 | kfree(bclink); | |
790 | bclink = NULL; | |
791 | return -ENOMEM; | |
792 | } | |
793 | ||
b97bf3fd PL |
794 | INIT_LIST_HEAD(&bcbearer->bearer.cong_links); |
795 | bcbearer->bearer.media = &bcbearer->media; | |
4323add6 | 796 | bcbearer->media.send_msg = tipc_bcbearer_send; |
b97bf3fd PL |
797 | sprintf(bcbearer->media.name, "tipc-multicast"); |
798 | ||
799 | bcl = &bclink->link; | |
b97bf3fd PL |
800 | INIT_LIST_HEAD(&bcl->waiting_ports); |
801 | bcl->next_out_no = 1; | |
34af946a | 802 | spin_lock_init(&bclink->node.lock); |
b97bf3fd | 803 | bcl->owner = &bclink->node; |
c4307285 | 804 | bcl->max_pkt = MAX_PKT_DEFAULT_MCAST; |
4323add6 | 805 | tipc_link_set_queue_limits(bcl, BCLINK_WIN_DEFAULT); |
b97bf3fd PL |
806 | bcl->b_ptr = &bcbearer->bearer; |
807 | bcl->state = WORKING_WORKING; | |
4b704d59 | 808 | strlcpy(bcl->name, tipc_bclink_name, TIPC_MAX_LINK_NAME); |
b97bf3fd PL |
809 | |
810 | if (BCLINK_LOG_BUF_SIZE) { | |
811 | char *pb = kmalloc(BCLINK_LOG_BUF_SIZE, GFP_ATOMIC); | |
812 | ||
813 | if (!pb) | |
814 | goto nomem; | |
4323add6 | 815 | tipc_printbuf_init(&bcl->print_buf, pb, BCLINK_LOG_BUF_SIZE); |
b97bf3fd PL |
816 | } |
817 | ||
0e35fd5e | 818 | return 0; |
b97bf3fd PL |
819 | } |
820 | ||
4323add6 | 821 | void tipc_bclink_stop(void) |
b97bf3fd PL |
822 | { |
823 | spin_lock_bh(&bc_lock); | |
824 | if (bcbearer) { | |
4323add6 | 825 | tipc_link_stop(bcl); |
b97bf3fd PL |
826 | if (BCLINK_LOG_BUF_SIZE) |
827 | kfree(bcl->print_buf.buf); | |
828 | bcl = NULL; | |
829 | kfree(bclink); | |
830 | bclink = NULL; | |
831 | kfree(bcbearer); | |
832 | bcbearer = NULL; | |
833 | } | |
834 | spin_unlock_bh(&bc_lock); | |
835 | } | |
836 | ||
3e22e62b AS |
837 | |
838 | /** | |
839 | * tipc_nmap_add - add a node to a node map | |
840 | */ | |
841 | ||
842 | void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node) | |
843 | { | |
844 | int n = tipc_node(node); | |
845 | int w = n / WSIZE; | |
846 | u32 mask = (1 << (n % WSIZE)); | |
847 | ||
848 | if ((nm_ptr->map[w] & mask) == 0) { | |
849 | nm_ptr->count++; | |
850 | nm_ptr->map[w] |= mask; | |
851 | } | |
852 | } | |
853 | ||
854 | /** | |
855 | * tipc_nmap_remove - remove a node from a node map | |
856 | */ | |
857 | ||
858 | void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node) | |
859 | { | |
860 | int n = tipc_node(node); | |
861 | int w = n / WSIZE; | |
862 | u32 mask = (1 << (n % WSIZE)); | |
863 | ||
864 | if ((nm_ptr->map[w] & mask) != 0) { | |
865 | nm_ptr->map[w] &= ~mask; | |
866 | nm_ptr->count--; | |
867 | } | |
868 | } | |
869 | ||
870 | /** | |
871 | * tipc_nmap_diff - find differences between node maps | |
872 | * @nm_a: input node map A | |
873 | * @nm_b: input node map B | |
874 | * @nm_diff: output node map A-B (i.e. nodes of A that are not in B) | |
875 | */ | |
876 | ||
31e3c3f6 | 877 | static void tipc_nmap_diff(struct tipc_node_map *nm_a, |
878 | struct tipc_node_map *nm_b, | |
879 | struct tipc_node_map *nm_diff) | |
3e22e62b AS |
880 | { |
881 | int stop = ARRAY_SIZE(nm_a->map); | |
882 | int w; | |
883 | int b; | |
884 | u32 map; | |
885 | ||
886 | memset(nm_diff, 0, sizeof(*nm_diff)); | |
887 | for (w = 0; w < stop; w++) { | |
888 | map = nm_a->map[w] ^ (nm_a->map[w] & nm_b->map[w]); | |
889 | nm_diff->map[w] = map; | |
890 | if (map != 0) { | |
891 | for (b = 0 ; b < WSIZE; b++) { | |
892 | if (map & (1 << b)) | |
893 | nm_diff->count++; | |
894 | } | |
895 | } | |
896 | } | |
897 | } | |
43608edc AS |
898 | |
899 | /** | |
900 | * tipc_port_list_add - add a port to a port list, ensuring no duplicates | |
901 | */ | |
902 | ||
903 | void tipc_port_list_add(struct port_list *pl_ptr, u32 port) | |
904 | { | |
905 | struct port_list *item = pl_ptr; | |
906 | int i; | |
907 | int item_sz = PLSIZE; | |
908 | int cnt = pl_ptr->count; | |
909 | ||
910 | for (; ; cnt -= item_sz, item = item->next) { | |
911 | if (cnt < PLSIZE) | |
912 | item_sz = cnt; | |
913 | for (i = 0; i < item_sz; i++) | |
914 | if (item->ports[i] == port) | |
915 | return; | |
916 | if (i < PLSIZE) { | |
917 | item->ports[i] = port; | |
918 | pl_ptr->count++; | |
919 | return; | |
920 | } | |
921 | if (!item->next) { | |
922 | item->next = kmalloc(sizeof(*item), GFP_ATOMIC); | |
923 | if (!item->next) { | |
924 | warn("Incomplete multicast delivery, no memory\n"); | |
925 | return; | |
926 | } | |
927 | item->next->next = NULL; | |
928 | } | |
929 | } | |
930 | } | |
931 | ||
932 | /** | |
933 | * tipc_port_list_free - free dynamically created entries in port_list chain | |
934 | * | |
935 | */ | |
936 | ||
937 | void tipc_port_list_free(struct port_list *pl_ptr) | |
938 | { | |
939 | struct port_list *item; | |
940 | struct port_list *next; | |
941 | ||
942 | for (item = pl_ptr->next; item; item = next) { | |
943 | next = item->next; | |
944 | kfree(item); | |
945 | } | |
946 | } | |
947 |