Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/bcast.c: TIPC broadcast code | |
c4307285 | 3 | * |
593a5f22 | 4 | * Copyright (c) 2004-2006, Ericsson AB |
b97bf3fd | 5 | * Copyright (c) 2004, Intel Corporation. |
2d627b92 | 6 | * Copyright (c) 2005, 2010-2011, 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" | |
b97bf3fd | 39 | #include "link.h" |
b97bf3fd | 40 | #include "port.h" |
b97bf3fd PL |
41 | #include "bcast.h" |
42 | ||
b97bf3fd PL |
43 | #define MAX_PKT_DEFAULT_MCAST 1500 /* bcast link max packet size (fixed) */ |
44 | ||
45 | #define BCLINK_WIN_DEFAULT 20 /* bcast link window size (default) */ | |
46 | ||
d356eeba AS |
47 | /* |
48 | * Loss rate for incoming broadcast frames; used to test retransmission code. | |
49 | * Set to N to cause every N'th frame to be discarded; 0 => don't discard any. | |
50 | */ | |
c4307285 | 51 | |
d356eeba AS |
52 | #define TIPC_BCAST_LOSS_RATE 0 |
53 | ||
b97bf3fd PL |
54 | /** |
55 | * struct bcbearer_pair - a pair of bearers used by broadcast link | |
56 | * @primary: pointer to primary bearer | |
57 | * @secondary: pointer to secondary bearer | |
c4307285 YH |
58 | * |
59 | * Bearers must have same priority and same set of reachable destinations | |
b97bf3fd PL |
60 | * to be paired. |
61 | */ | |
62 | ||
63 | struct bcbearer_pair { | |
2d627b92 AS |
64 | struct tipc_bearer *primary; |
65 | struct tipc_bearer *secondary; | |
b97bf3fd PL |
66 | }; |
67 | ||
68 | /** | |
69 | * struct bcbearer - bearer used by broadcast link | |
70 | * @bearer: (non-standard) broadcast bearer structure | |
71 | * @media: (non-standard) broadcast media structure | |
72 | * @bpairs: array of bearer pairs | |
65f51ef0 AS |
73 | * @bpairs_temp: temporary array of bearer pairs used by tipc_bcbearer_sort() |
74 | * @remains: temporary node map used by tipc_bcbearer_send() | |
75 | * @remains_new: temporary node map used tipc_bcbearer_send() | |
c4307285 | 76 | * |
65f51ef0 AS |
77 | * Note: The fields labelled "temporary" are incorporated into the bearer |
78 | * to avoid consuming potentially limited stack space through the use of | |
79 | * large local variables within multicast routines. Concurrent access is | |
80 | * prevented through use of the spinlock "bc_lock". | |
b97bf3fd PL |
81 | */ |
82 | ||
83 | struct bcbearer { | |
2d627b92 | 84 | struct tipc_bearer bearer; |
b97bf3fd PL |
85 | struct media media; |
86 | struct bcbearer_pair bpairs[MAX_BEARERS]; | |
16cb4b33 | 87 | struct bcbearer_pair bpairs_temp[TIPC_MAX_LINK_PRI + 1]; |
6c00055a DM |
88 | struct tipc_node_map remains; |
89 | struct tipc_node_map remains_new; | |
b97bf3fd PL |
90 | }; |
91 | ||
92 | /** | |
93 | * struct bclink - link used for broadcast messages | |
94 | * @link: (non-standard) broadcast link structure | |
95 | * @node: (non-standard) node structure representing b'cast link's peer node | |
01d83edd | 96 | * @retransmit_to: node that most recently requested a retransmit |
c4307285 | 97 | * |
b97bf3fd PL |
98 | * Handles sequence numbering, fragmentation, bundling, etc. |
99 | */ | |
100 | ||
101 | struct bclink { | |
102 | struct link link; | |
6c00055a | 103 | struct tipc_node node; |
01d83edd | 104 | struct tipc_node *retransmit_to; |
b97bf3fd PL |
105 | }; |
106 | ||
107 | ||
e3ec9c7d AS |
108 | static struct bcbearer *bcbearer; |
109 | static struct bclink *bclink; | |
110 | static struct link *bcl; | |
34af946a | 111 | static DEFINE_SPINLOCK(bc_lock); |
b97bf3fd | 112 | |
8f92df6a AS |
113 | /* broadcast-capable node map */ |
114 | struct tipc_node_map tipc_bcast_nmap; | |
115 | ||
3aec9cc9 | 116 | const char tipc_bclink_name[] = "broadcast-link"; |
b97bf3fd | 117 | |
31e3c3f6 | 118 | static void tipc_nmap_diff(struct tipc_node_map *nm_a, |
119 | struct tipc_node_map *nm_b, | |
120 | struct tipc_node_map *nm_diff); | |
b97bf3fd | 121 | |
05790c64 | 122 | static u32 buf_seqno(struct sk_buff *buf) |
b97bf3fd PL |
123 | { |
124 | return msg_seqno(buf_msg(buf)); | |
c4307285 | 125 | } |
b97bf3fd | 126 | |
05790c64 | 127 | static u32 bcbuf_acks(struct sk_buff *buf) |
b97bf3fd | 128 | { |
880b005f | 129 | return (u32)(unsigned long)TIPC_SKB_CB(buf)->handle; |
b97bf3fd PL |
130 | } |
131 | ||
05790c64 | 132 | static void bcbuf_set_acks(struct sk_buff *buf, u32 acks) |
b97bf3fd | 133 | { |
880b005f | 134 | TIPC_SKB_CB(buf)->handle = (void *)(unsigned long)acks; |
b97bf3fd PL |
135 | } |
136 | ||
05790c64 | 137 | static void bcbuf_decr_acks(struct sk_buff *buf) |
b97bf3fd PL |
138 | { |
139 | bcbuf_set_acks(buf, bcbuf_acks(buf) - 1); | |
140 | } | |
141 | ||
142 | ||
5b1f7bde AS |
143 | static void bclink_set_last_sent(void) |
144 | { | |
145 | if (bcl->next_out) | |
146 | bcl->fsm_msg_cnt = mod(buf_seqno(bcl->next_out) - 1); | |
147 | else | |
148 | bcl->fsm_msg_cnt = mod(bcl->next_out_no - 1); | |
149 | } | |
150 | ||
151 | u32 tipc_bclink_get_last_sent(void) | |
152 | { | |
153 | return bcl->fsm_msg_cnt; | |
154 | } | |
155 | ||
c4307285 | 156 | /** |
b97bf3fd | 157 | * bclink_set_gap - set gap according to contents of current deferred pkt queue |
c4307285 | 158 | * |
b97bf3fd PL |
159 | * Called with 'node' locked, bc_lock unlocked |
160 | */ | |
161 | ||
6c00055a | 162 | static void bclink_set_gap(struct tipc_node *n_ptr) |
b97bf3fd PL |
163 | { |
164 | struct sk_buff *buf = n_ptr->bclink.deferred_head; | |
165 | ||
166 | n_ptr->bclink.gap_after = n_ptr->bclink.gap_to = | |
167 | mod(n_ptr->bclink.last_in); | |
168 | if (unlikely(buf != NULL)) | |
169 | n_ptr->bclink.gap_to = mod(buf_seqno(buf) - 1); | |
170 | } | |
171 | ||
c4307285 | 172 | /** |
b97bf3fd | 173 | * bclink_ack_allowed - test if ACK or NACK message can be sent at this moment |
c4307285 | 174 | * |
b97bf3fd PL |
175 | * This mechanism endeavours to prevent all nodes in network from trying |
176 | * to ACK or NACK at the same time. | |
c4307285 | 177 | * |
b97bf3fd | 178 | * Note: TIPC uses a different trigger to distribute ACKs than it does to |
c4307285 | 179 | * distribute NACKs, but tries to use the same spacing (divide by 16). |
b97bf3fd PL |
180 | */ |
181 | ||
05790c64 | 182 | static int bclink_ack_allowed(u32 n) |
b97bf3fd | 183 | { |
a02cec21 | 184 | return (n % TIPC_MIN_LINK_WIN) == tipc_own_tag; |
b97bf3fd PL |
185 | } |
186 | ||
187 | ||
01d83edd AS |
188 | /** |
189 | * tipc_bclink_retransmit_to - get most recent node to request retransmission | |
190 | * | |
191 | * Called with bc_lock locked | |
192 | */ | |
193 | ||
194 | struct tipc_node *tipc_bclink_retransmit_to(void) | |
195 | { | |
196 | return bclink->retransmit_to; | |
197 | } | |
198 | ||
c4307285 | 199 | /** |
b97bf3fd PL |
200 | * bclink_retransmit_pkt - retransmit broadcast packets |
201 | * @after: sequence number of last packet to *not* retransmit | |
202 | * @to: sequence number of last packet to retransmit | |
c4307285 | 203 | * |
d356eeba | 204 | * Called with bc_lock locked |
b97bf3fd PL |
205 | */ |
206 | ||
207 | static void bclink_retransmit_pkt(u32 after, u32 to) | |
208 | { | |
209 | struct sk_buff *buf; | |
210 | ||
b97bf3fd | 211 | buf = bcl->first_out; |
a016892c | 212 | while (buf && less_eq(buf_seqno(buf), after)) |
c4307285 | 213 | buf = buf->next; |
d356eeba | 214 | tipc_link_retransmit(bcl, buf, mod(to - after)); |
b97bf3fd PL |
215 | } |
216 | ||
c4307285 | 217 | /** |
4323add6 | 218 | * tipc_bclink_acknowledge - handle acknowledgement of broadcast packets |
b97bf3fd PL |
219 | * @n_ptr: node that sent acknowledgement info |
220 | * @acked: broadcast sequence # that has been acknowledged | |
c4307285 | 221 | * |
b97bf3fd PL |
222 | * Node is locked, bc_lock unlocked. |
223 | */ | |
224 | ||
6c00055a | 225 | void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked) |
b97bf3fd PL |
226 | { |
227 | struct sk_buff *crs; | |
228 | struct sk_buff *next; | |
229 | unsigned int released = 0; | |
230 | ||
231 | if (less_eq(acked, n_ptr->bclink.acked)) | |
232 | return; | |
233 | ||
234 | spin_lock_bh(&bc_lock); | |
235 | ||
236 | /* Skip over packets that node has previously acknowledged */ | |
237 | ||
238 | crs = bcl->first_out; | |
a016892c | 239 | while (crs && less_eq(buf_seqno(crs), n_ptr->bclink.acked)) |
b97bf3fd | 240 | crs = crs->next; |
b97bf3fd PL |
241 | |
242 | /* Update packets that node is now acknowledging */ | |
243 | ||
244 | while (crs && less_eq(buf_seqno(crs), acked)) { | |
245 | next = crs->next; | |
246 | bcbuf_decr_acks(crs); | |
247 | if (bcbuf_acks(crs) == 0) { | |
248 | bcl->first_out = next; | |
249 | bcl->out_queue_size--; | |
250 | buf_discard(crs); | |
251 | released = 1; | |
252 | } | |
253 | crs = next; | |
254 | } | |
255 | n_ptr->bclink.acked = acked; | |
256 | ||
257 | /* Try resolving broadcast link congestion, if necessary */ | |
258 | ||
5b1f7bde | 259 | if (unlikely(bcl->next_out)) { |
4323add6 | 260 | tipc_link_push_queue(bcl); |
5b1f7bde AS |
261 | bclink_set_last_sent(); |
262 | } | |
b97bf3fd | 263 | if (unlikely(released && !list_empty(&bcl->waiting_ports))) |
4323add6 | 264 | tipc_link_wakeup_ports(bcl, 0); |
b97bf3fd PL |
265 | spin_unlock_bh(&bc_lock); |
266 | } | |
267 | ||
c4307285 | 268 | /** |
b97bf3fd | 269 | * bclink_send_ack - unicast an ACK msg |
c4307285 | 270 | * |
4323add6 | 271 | * tipc_net_lock and node lock set |
b97bf3fd PL |
272 | */ |
273 | ||
6c00055a | 274 | static void bclink_send_ack(struct tipc_node *n_ptr) |
b97bf3fd PL |
275 | { |
276 | struct link *l_ptr = n_ptr->active_links[n_ptr->addr & 1]; | |
277 | ||
278 | if (l_ptr != NULL) | |
4323add6 | 279 | tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0); |
b97bf3fd PL |
280 | } |
281 | ||
c4307285 | 282 | /** |
b97bf3fd | 283 | * bclink_send_nack- broadcast a NACK msg |
c4307285 | 284 | * |
4323add6 | 285 | * tipc_net_lock and node lock set |
b97bf3fd PL |
286 | */ |
287 | ||
6c00055a | 288 | static void bclink_send_nack(struct tipc_node *n_ptr) |
b97bf3fd PL |
289 | { |
290 | struct sk_buff *buf; | |
291 | struct tipc_msg *msg; | |
292 | ||
293 | if (!less(n_ptr->bclink.gap_after, n_ptr->bclink.gap_to)) | |
294 | return; | |
295 | ||
31e3c3f6 | 296 | buf = tipc_buf_acquire(INT_H_SIZE); |
b97bf3fd PL |
297 | if (buf) { |
298 | msg = buf_msg(buf); | |
c68ca7b7 | 299 | tipc_msg_init(msg, BCAST_PROTOCOL, STATE_MSG, |
75715217 | 300 | INT_H_SIZE, n_ptr->addr); |
b97bf3fd | 301 | msg_set_mc_netid(msg, tipc_net_id); |
c4307285 | 302 | msg_set_bcast_ack(msg, mod(n_ptr->bclink.last_in)); |
b97bf3fd PL |
303 | msg_set_bcgap_after(msg, n_ptr->bclink.gap_after); |
304 | msg_set_bcgap_to(msg, n_ptr->bclink.gap_to); | |
305 | msg_set_bcast_tag(msg, tipc_own_tag); | |
306 | ||
1fc54d8f | 307 | if (tipc_bearer_send(&bcbearer->bearer, buf, NULL)) { |
b97bf3fd PL |
308 | bcl->stats.sent_nacks++; |
309 | buf_discard(buf); | |
310 | } else { | |
4323add6 | 311 | tipc_bearer_schedule(bcl->b_ptr, bcl); |
b97bf3fd PL |
312 | bcl->proto_msg_queue = buf; |
313 | bcl->stats.bearer_congs++; | |
314 | } | |
315 | ||
c4307285 | 316 | /* |
b97bf3fd PL |
317 | * Ensure we doesn't send another NACK msg to the node |
318 | * until 16 more deferred messages arrive from it | |
319 | * (i.e. helps prevent all nodes from NACK'ing at same time) | |
320 | */ | |
c4307285 | 321 | |
b97bf3fd PL |
322 | n_ptr->bclink.nack_sync = tipc_own_tag; |
323 | } | |
324 | } | |
325 | ||
c4307285 | 326 | /** |
4323add6 | 327 | * tipc_bclink_check_gap - send a NACK if a sequence gap exists |
b97bf3fd | 328 | * |
4323add6 | 329 | * tipc_net_lock and node lock set |
b97bf3fd PL |
330 | */ |
331 | ||
6c00055a | 332 | void tipc_bclink_check_gap(struct tipc_node *n_ptr, u32 last_sent) |
b97bf3fd PL |
333 | { |
334 | if (!n_ptr->bclink.supported || | |
335 | less_eq(last_sent, mod(n_ptr->bclink.last_in))) | |
336 | return; | |
337 | ||
338 | bclink_set_gap(n_ptr); | |
339 | if (n_ptr->bclink.gap_after == n_ptr->bclink.gap_to) | |
340 | n_ptr->bclink.gap_to = last_sent; | |
341 | bclink_send_nack(n_ptr); | |
342 | } | |
343 | ||
c4307285 | 344 | /** |
4323add6 | 345 | * tipc_bclink_peek_nack - process a NACK msg meant for another node |
c4307285 | 346 | * |
4323add6 | 347 | * Only tipc_net_lock set. |
b97bf3fd PL |
348 | */ |
349 | ||
988f088a | 350 | static void tipc_bclink_peek_nack(u32 dest, u32 sender_tag, u32 gap_after, u32 gap_to) |
b97bf3fd | 351 | { |
6c00055a | 352 | struct tipc_node *n_ptr = tipc_node_find(dest); |
b97bf3fd PL |
353 | u32 my_after, my_to; |
354 | ||
4323add6 | 355 | if (unlikely(!n_ptr || !tipc_node_is_up(n_ptr))) |
b97bf3fd | 356 | return; |
4323add6 | 357 | tipc_node_lock(n_ptr); |
b97bf3fd PL |
358 | /* |
359 | * Modify gap to suppress unnecessary NACKs from this node | |
360 | */ | |
361 | my_after = n_ptr->bclink.gap_after; | |
362 | my_to = n_ptr->bclink.gap_to; | |
363 | ||
364 | if (less_eq(gap_after, my_after)) { | |
365 | if (less(my_after, gap_to) && less(gap_to, my_to)) | |
366 | n_ptr->bclink.gap_after = gap_to; | |
367 | else if (less_eq(my_to, gap_to)) | |
368 | n_ptr->bclink.gap_to = n_ptr->bclink.gap_after; | |
369 | } else if (less_eq(gap_after, my_to)) { | |
370 | if (less_eq(my_to, gap_to)) | |
371 | n_ptr->bclink.gap_to = gap_after; | |
372 | } else { | |
c4307285 | 373 | /* |
b97bf3fd PL |
374 | * Expand gap if missing bufs not in deferred queue: |
375 | */ | |
376 | struct sk_buff *buf = n_ptr->bclink.deferred_head; | |
377 | u32 prev = n_ptr->bclink.gap_to; | |
378 | ||
379 | for (; buf; buf = buf->next) { | |
380 | u32 seqno = buf_seqno(buf); | |
381 | ||
3ac90216 | 382 | if (mod(seqno - prev) != 1) { |
b97bf3fd | 383 | buf = NULL; |
3ac90216 ES |
384 | break; |
385 | } | |
b97bf3fd PL |
386 | if (seqno == gap_after) |
387 | break; | |
388 | prev = seqno; | |
389 | } | |
390 | if (buf == NULL) | |
391 | n_ptr->bclink.gap_to = gap_after; | |
392 | } | |
393 | /* | |
394 | * Some nodes may send a complementary NACK now: | |
c4307285 | 395 | */ |
b97bf3fd PL |
396 | if (bclink_ack_allowed(sender_tag + 1)) { |
397 | if (n_ptr->bclink.gap_to != n_ptr->bclink.gap_after) { | |
398 | bclink_send_nack(n_ptr); | |
399 | bclink_set_gap(n_ptr); | |
400 | } | |
401 | } | |
4323add6 | 402 | tipc_node_unlock(n_ptr); |
b97bf3fd PL |
403 | } |
404 | ||
405 | /** | |
4323add6 | 406 | * tipc_bclink_send_msg - broadcast a packet to all nodes in cluster |
b97bf3fd PL |
407 | */ |
408 | ||
4323add6 | 409 | int tipc_bclink_send_msg(struct sk_buff *buf) |
b97bf3fd PL |
410 | { |
411 | int res; | |
412 | ||
413 | spin_lock_bh(&bc_lock); | |
414 | ||
4323add6 | 415 | res = tipc_link_send_buf(bcl, buf); |
b97bf3fd PL |
416 | if (unlikely(res == -ELINKCONG)) |
417 | buf_discard(buf); | |
0048b826 | 418 | else |
5b1f7bde | 419 | bclink_set_last_sent(); |
b97bf3fd | 420 | |
b97bf3fd PL |
421 | bcl->stats.queue_sz_counts++; |
422 | bcl->stats.accu_queue_sz += bcl->out_queue_size; | |
423 | ||
424 | spin_unlock_bh(&bc_lock); | |
425 | return res; | |
426 | } | |
427 | ||
428 | /** | |
4323add6 | 429 | * tipc_bclink_recv_pkt - receive a broadcast packet, and deliver upwards |
c4307285 | 430 | * |
4323add6 | 431 | * tipc_net_lock is read_locked, no other locks set |
b97bf3fd PL |
432 | */ |
433 | ||
4323add6 | 434 | void tipc_bclink_recv_pkt(struct sk_buff *buf) |
d356eeba AS |
435 | { |
436 | #if (TIPC_BCAST_LOSS_RATE) | |
e3ec9c7d | 437 | static int rx_count; |
d356eeba | 438 | #endif |
b97bf3fd | 439 | struct tipc_msg *msg = buf_msg(buf); |
0e65967e | 440 | struct tipc_node *node = tipc_node_find(msg_prevnode(msg)); |
b97bf3fd PL |
441 | u32 next_in; |
442 | u32 seqno; | |
443 | struct sk_buff *deferred; | |
444 | ||
c4307285 | 445 | if (unlikely(!node || !tipc_node_is_up(node) || !node->bclink.supported || |
b97bf3fd PL |
446 | (msg_mc_netid(msg) != tipc_net_id))) { |
447 | buf_discard(buf); | |
448 | return; | |
449 | } | |
450 | ||
451 | if (unlikely(msg_user(msg) == BCAST_PROTOCOL)) { | |
b97bf3fd | 452 | if (msg_destnode(msg) == tipc_own_addr) { |
4323add6 PL |
453 | tipc_node_lock(node); |
454 | tipc_bclink_acknowledge(node, msg_bcast_ack(msg)); | |
455 | tipc_node_unlock(node); | |
d356eeba | 456 | spin_lock_bh(&bc_lock); |
b97bf3fd | 457 | bcl->stats.recv_nacks++; |
01d83edd | 458 | bclink->retransmit_to = node; |
b97bf3fd PL |
459 | bclink_retransmit_pkt(msg_bcgap_after(msg), |
460 | msg_bcgap_to(msg)); | |
c4307285 | 461 | spin_unlock_bh(&bc_lock); |
b97bf3fd | 462 | } else { |
4323add6 | 463 | tipc_bclink_peek_nack(msg_destnode(msg), |
988f088a AB |
464 | msg_bcast_tag(msg), |
465 | msg_bcgap_after(msg), | |
466 | msg_bcgap_to(msg)); | |
b97bf3fd PL |
467 | } |
468 | buf_discard(buf); | |
469 | return; | |
470 | } | |
471 | ||
d356eeba AS |
472 | #if (TIPC_BCAST_LOSS_RATE) |
473 | if (++rx_count == TIPC_BCAST_LOSS_RATE) { | |
474 | rx_count = 0; | |
475 | buf_discard(buf); | |
476 | return; | |
477 | } | |
478 | #endif | |
479 | ||
4323add6 | 480 | tipc_node_lock(node); |
b97bf3fd PL |
481 | receive: |
482 | deferred = node->bclink.deferred_head; | |
483 | next_in = mod(node->bclink.last_in + 1); | |
484 | seqno = msg_seqno(msg); | |
485 | ||
486 | if (likely(seqno == next_in)) { | |
487 | bcl->stats.recv_info++; | |
488 | node->bclink.last_in++; | |
489 | bclink_set_gap(node); | |
490 | if (unlikely(bclink_ack_allowed(seqno))) { | |
491 | bclink_send_ack(node); | |
492 | bcl->stats.sent_acks++; | |
493 | } | |
494 | if (likely(msg_isdata(msg))) { | |
4323add6 PL |
495 | tipc_node_unlock(node); |
496 | tipc_port_recv_mcast(buf, NULL); | |
b97bf3fd PL |
497 | } else if (msg_user(msg) == MSG_BUNDLER) { |
498 | bcl->stats.recv_bundles++; | |
499 | bcl->stats.recv_bundled += msg_msgcnt(msg); | |
4323add6 PL |
500 | tipc_node_unlock(node); |
501 | tipc_link_recv_bundle(buf); | |
b97bf3fd PL |
502 | } else if (msg_user(msg) == MSG_FRAGMENTER) { |
503 | bcl->stats.recv_fragments++; | |
4323add6 PL |
504 | if (tipc_link_recv_fragment(&node->bclink.defragm, |
505 | &buf, &msg)) | |
b97bf3fd | 506 | bcl->stats.recv_fragmented++; |
4323add6 PL |
507 | tipc_node_unlock(node); |
508 | tipc_net_route_msg(buf); | |
b97bf3fd | 509 | } else { |
4323add6 PL |
510 | tipc_node_unlock(node); |
511 | tipc_net_route_msg(buf); | |
b97bf3fd PL |
512 | } |
513 | if (deferred && (buf_seqno(deferred) == mod(next_in + 1))) { | |
4323add6 | 514 | tipc_node_lock(node); |
b97bf3fd PL |
515 | buf = deferred; |
516 | msg = buf_msg(buf); | |
517 | node->bclink.deferred_head = deferred->next; | |
518 | goto receive; | |
519 | } | |
520 | return; | |
521 | } else if (less(next_in, seqno)) { | |
522 | u32 gap_after = node->bclink.gap_after; | |
523 | u32 gap_to = node->bclink.gap_to; | |
524 | ||
4323add6 PL |
525 | if (tipc_link_defer_pkt(&node->bclink.deferred_head, |
526 | &node->bclink.deferred_tail, | |
527 | buf)) { | |
b97bf3fd PL |
528 | node->bclink.nack_sync++; |
529 | bcl->stats.deferred_recv++; | |
530 | if (seqno == mod(gap_after + 1)) | |
531 | node->bclink.gap_after = seqno; | |
532 | else if (less(gap_after, seqno) && less(seqno, gap_to)) | |
533 | node->bclink.gap_to = seqno; | |
534 | } | |
535 | if (bclink_ack_allowed(node->bclink.nack_sync)) { | |
536 | if (gap_to != gap_after) | |
537 | bclink_send_nack(node); | |
538 | bclink_set_gap(node); | |
539 | } | |
540 | } else { | |
541 | bcl->stats.duplicates++; | |
542 | buf_discard(buf); | |
543 | } | |
4323add6 | 544 | tipc_node_unlock(node); |
b97bf3fd PL |
545 | } |
546 | ||
6c00055a | 547 | u32 tipc_bclink_acks_missing(struct tipc_node *n_ptr) |
b97bf3fd PL |
548 | { |
549 | return (n_ptr->bclink.supported && | |
4323add6 | 550 | (tipc_bclink_get_last_sent() != n_ptr->bclink.acked)); |
b97bf3fd PL |
551 | } |
552 | ||
553 | ||
554 | /** | |
4323add6 | 555 | * tipc_bcbearer_send - send a packet through the broadcast pseudo-bearer |
c4307285 | 556 | * |
b97bf3fd PL |
557 | * Send through as many bearers as necessary to reach all nodes |
558 | * that support TIPC multicasting. | |
c4307285 | 559 | * |
b97bf3fd PL |
560 | * Returns 0 if packet sent successfully, non-zero if not |
561 | */ | |
562 | ||
988f088a AB |
563 | static int tipc_bcbearer_send(struct sk_buff *buf, |
564 | struct tipc_bearer *unused1, | |
565 | struct tipc_media_addr *unused2) | |
b97bf3fd | 566 | { |
b97bf3fd | 567 | int bp_index; |
b97bf3fd PL |
568 | |
569 | /* Prepare buffer for broadcasting (if first time trying to send it) */ | |
570 | ||
571 | if (likely(!msg_non_seq(buf_msg(buf)))) { | |
572 | struct tipc_msg *msg; | |
573 | ||
8f92df6a AS |
574 | assert(tipc_bcast_nmap.count != 0); |
575 | bcbuf_set_acks(buf, tipc_bcast_nmap.count); | |
b97bf3fd | 576 | msg = buf_msg(buf); |
40aecb1b | 577 | msg_set_non_seq(msg, 1); |
b97bf3fd | 578 | msg_set_mc_netid(msg, tipc_net_id); |
0048b826 | 579 | bcl->stats.sent_info++; |
b97bf3fd PL |
580 | } |
581 | ||
b97bf3fd | 582 | /* Send buffer over bearers until all targets reached */ |
c4307285 | 583 | |
8f92df6a | 584 | bcbearer->remains = tipc_bcast_nmap; |
b97bf3fd PL |
585 | |
586 | for (bp_index = 0; bp_index < MAX_BEARERS; bp_index++) { | |
2d627b92 AS |
587 | struct tipc_bearer *p = bcbearer->bpairs[bp_index].primary; |
588 | struct tipc_bearer *s = bcbearer->bpairs[bp_index].secondary; | |
b97bf3fd PL |
589 | |
590 | if (!p) | |
591 | break; /* no more bearers to try */ | |
592 | ||
65f51ef0 AS |
593 | tipc_nmap_diff(&bcbearer->remains, &p->nodes, &bcbearer->remains_new); |
594 | if (bcbearer->remains_new.count == bcbearer->remains.count) | |
b97bf3fd PL |
595 | continue; /* bearer pair doesn't add anything */ |
596 | ||
2d627b92 AS |
597 | if (p->blocked || |
598 | p->media->send_msg(buf, p, &p->media->bcast_addr)) { | |
1a624832 | 599 | /* unable to send on primary bearer */ |
2d627b92 AS |
600 | if (!s || s->blocked || |
601 | s->media->send_msg(buf, s, | |
1a624832 NH |
602 | &s->media->bcast_addr)) { |
603 | /* unable to send on either bearer */ | |
604 | continue; | |
605 | } | |
606 | } | |
607 | ||
608 | if (s) { | |
609 | bcbearer->bpairs[bp_index].primary = s; | |
610 | bcbearer->bpairs[bp_index].secondary = p; | |
b97bf3fd PL |
611 | } |
612 | ||
65f51ef0 | 613 | if (bcbearer->remains_new.count == 0) |
0e35fd5e | 614 | return 0; |
b97bf3fd | 615 | |
65f51ef0 | 616 | bcbearer->remains = bcbearer->remains_new; |
b97bf3fd | 617 | } |
c4307285 | 618 | |
7e3e5d09 AS |
619 | /* |
620 | * Unable to reach all targets (indicate success, since currently | |
621 | * there isn't code in place to properly block & unblock the | |
622 | * pseudo-bearer used by the broadcast link) | |
623 | */ | |
b97bf3fd | 624 | |
7e3e5d09 | 625 | return TIPC_OK; |
b97bf3fd PL |
626 | } |
627 | ||
628 | /** | |
4323add6 | 629 | * tipc_bcbearer_sort - create sets of bearer pairs used by broadcast bearer |
b97bf3fd PL |
630 | */ |
631 | ||
4323add6 | 632 | void tipc_bcbearer_sort(void) |
b97bf3fd PL |
633 | { |
634 | struct bcbearer_pair *bp_temp = bcbearer->bpairs_temp; | |
635 | struct bcbearer_pair *bp_curr; | |
636 | int b_index; | |
637 | int pri; | |
638 | ||
639 | spin_lock_bh(&bc_lock); | |
640 | ||
641 | /* Group bearers by priority (can assume max of two per priority) */ | |
642 | ||
643 | memset(bp_temp, 0, sizeof(bcbearer->bpairs_temp)); | |
644 | ||
645 | for (b_index = 0; b_index < MAX_BEARERS; b_index++) { | |
2d627b92 | 646 | struct tipc_bearer *b = &tipc_bearers[b_index]; |
b97bf3fd PL |
647 | |
648 | if (!b->active || !b->nodes.count) | |
649 | continue; | |
650 | ||
651 | if (!bp_temp[b->priority].primary) | |
652 | bp_temp[b->priority].primary = b; | |
653 | else | |
654 | bp_temp[b->priority].secondary = b; | |
655 | } | |
656 | ||
657 | /* Create array of bearer pairs for broadcasting */ | |
658 | ||
659 | bp_curr = bcbearer->bpairs; | |
660 | memset(bcbearer->bpairs, 0, sizeof(bcbearer->bpairs)); | |
661 | ||
16cb4b33 | 662 | for (pri = TIPC_MAX_LINK_PRI; pri >= 0; pri--) { |
b97bf3fd PL |
663 | |
664 | if (!bp_temp[pri].primary) | |
665 | continue; | |
666 | ||
667 | bp_curr->primary = bp_temp[pri].primary; | |
668 | ||
669 | if (bp_temp[pri].secondary) { | |
4323add6 PL |
670 | if (tipc_nmap_equal(&bp_temp[pri].primary->nodes, |
671 | &bp_temp[pri].secondary->nodes)) { | |
b97bf3fd PL |
672 | bp_curr->secondary = bp_temp[pri].secondary; |
673 | } else { | |
674 | bp_curr++; | |
675 | bp_curr->primary = bp_temp[pri].secondary; | |
676 | } | |
677 | } | |
678 | ||
679 | bp_curr++; | |
680 | } | |
681 | ||
682 | spin_unlock_bh(&bc_lock); | |
683 | } | |
684 | ||
685 | /** | |
4323add6 | 686 | * tipc_bcbearer_push - resolve bearer congestion |
c4307285 | 687 | * |
b97bf3fd PL |
688 | * Forces bclink to push out any unsent packets, until all packets are gone |
689 | * or congestion reoccurs. | |
690 | * No locks set when function called | |
691 | */ | |
692 | ||
4323add6 | 693 | void tipc_bcbearer_push(void) |
b97bf3fd | 694 | { |
2d627b92 | 695 | struct tipc_bearer *b_ptr; |
b97bf3fd PL |
696 | |
697 | spin_lock_bh(&bc_lock); | |
698 | b_ptr = &bcbearer->bearer; | |
2d627b92 AS |
699 | if (b_ptr->blocked) { |
700 | b_ptr->blocked = 0; | |
4323add6 | 701 | tipc_bearer_lock_push(b_ptr); |
b97bf3fd PL |
702 | } |
703 | spin_unlock_bh(&bc_lock); | |
704 | } | |
705 | ||
706 | ||
4323add6 | 707 | int tipc_bclink_stats(char *buf, const u32 buf_size) |
b97bf3fd PL |
708 | { |
709 | struct print_buf pb; | |
710 | ||
711 | if (!bcl) | |
712 | return 0; | |
713 | ||
4323add6 | 714 | tipc_printbuf_init(&pb, buf, buf_size); |
b97bf3fd PL |
715 | |
716 | spin_lock_bh(&bc_lock); | |
717 | ||
718 | tipc_printf(&pb, "Link <%s>\n" | |
c4307285 | 719 | " Window:%u packets\n", |
b97bf3fd | 720 | bcl->name, bcl->queue_limit[0]); |
c4307285 | 721 | tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n", |
b97bf3fd PL |
722 | bcl->stats.recv_info, |
723 | bcl->stats.recv_fragments, | |
724 | bcl->stats.recv_fragmented, | |
725 | bcl->stats.recv_bundles, | |
726 | bcl->stats.recv_bundled); | |
c4307285 | 727 | tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n", |
b97bf3fd PL |
728 | bcl->stats.sent_info, |
729 | bcl->stats.sent_fragments, | |
c4307285 | 730 | bcl->stats.sent_fragmented, |
b97bf3fd PL |
731 | bcl->stats.sent_bundles, |
732 | bcl->stats.sent_bundled); | |
c4307285 | 733 | tipc_printf(&pb, " RX naks:%u defs:%u dups:%u\n", |
b97bf3fd | 734 | bcl->stats.recv_nacks, |
c4307285 | 735 | bcl->stats.deferred_recv, |
b97bf3fd | 736 | bcl->stats.duplicates); |
c4307285 YH |
737 | tipc_printf(&pb, " TX naks:%u acks:%u dups:%u\n", |
738 | bcl->stats.sent_nacks, | |
739 | bcl->stats.sent_acks, | |
b97bf3fd PL |
740 | bcl->stats.retransmitted); |
741 | tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n", | |
742 | bcl->stats.bearer_congs, | |
743 | bcl->stats.link_congs, | |
744 | bcl->stats.max_queue_sz, | |
745 | bcl->stats.queue_sz_counts | |
746 | ? (bcl->stats.accu_queue_sz / bcl->stats.queue_sz_counts) | |
747 | : 0); | |
748 | ||
749 | spin_unlock_bh(&bc_lock); | |
4323add6 | 750 | return tipc_printbuf_validate(&pb); |
b97bf3fd PL |
751 | } |
752 | ||
4323add6 | 753 | int tipc_bclink_reset_stats(void) |
b97bf3fd PL |
754 | { |
755 | if (!bcl) | |
756 | return -ENOPROTOOPT; | |
757 | ||
758 | spin_lock_bh(&bc_lock); | |
759 | memset(&bcl->stats, 0, sizeof(bcl->stats)); | |
760 | spin_unlock_bh(&bc_lock); | |
0e35fd5e | 761 | return 0; |
b97bf3fd PL |
762 | } |
763 | ||
4323add6 | 764 | int tipc_bclink_set_queue_limits(u32 limit) |
b97bf3fd PL |
765 | { |
766 | if (!bcl) | |
767 | return -ENOPROTOOPT; | |
768 | if ((limit < TIPC_MIN_LINK_WIN) || (limit > TIPC_MAX_LINK_WIN)) | |
769 | return -EINVAL; | |
770 | ||
771 | spin_lock_bh(&bc_lock); | |
4323add6 | 772 | tipc_link_set_queue_limits(bcl, limit); |
b97bf3fd | 773 | spin_unlock_bh(&bc_lock); |
0e35fd5e | 774 | return 0; |
b97bf3fd PL |
775 | } |
776 | ||
4323add6 | 777 | int tipc_bclink_init(void) |
b97bf3fd | 778 | { |
2710b57f ACM |
779 | bcbearer = kzalloc(sizeof(*bcbearer), GFP_ATOMIC); |
780 | bclink = kzalloc(sizeof(*bclink), GFP_ATOMIC); | |
b97bf3fd | 781 | if (!bcbearer || !bclink) { |
c4307285 | 782 | warn("Multicast link creation failed, no memory\n"); |
b97bf3fd PL |
783 | kfree(bcbearer); |
784 | bcbearer = NULL; | |
785 | kfree(bclink); | |
786 | bclink = NULL; | |
787 | return -ENOMEM; | |
788 | } | |
789 | ||
b97bf3fd PL |
790 | INIT_LIST_HEAD(&bcbearer->bearer.cong_links); |
791 | bcbearer->bearer.media = &bcbearer->media; | |
4323add6 | 792 | bcbearer->media.send_msg = tipc_bcbearer_send; |
b97bf3fd PL |
793 | sprintf(bcbearer->media.name, "tipc-multicast"); |
794 | ||
795 | bcl = &bclink->link; | |
b97bf3fd PL |
796 | INIT_LIST_HEAD(&bcl->waiting_ports); |
797 | bcl->next_out_no = 1; | |
34af946a | 798 | spin_lock_init(&bclink->node.lock); |
b97bf3fd | 799 | bcl->owner = &bclink->node; |
c4307285 | 800 | bcl->max_pkt = MAX_PKT_DEFAULT_MCAST; |
4323add6 | 801 | tipc_link_set_queue_limits(bcl, BCLINK_WIN_DEFAULT); |
b97bf3fd PL |
802 | bcl->b_ptr = &bcbearer->bearer; |
803 | bcl->state = WORKING_WORKING; | |
4b704d59 | 804 | strlcpy(bcl->name, tipc_bclink_name, TIPC_MAX_LINK_NAME); |
b97bf3fd | 805 | |
0e35fd5e | 806 | return 0; |
b97bf3fd PL |
807 | } |
808 | ||
4323add6 | 809 | void tipc_bclink_stop(void) |
b97bf3fd PL |
810 | { |
811 | spin_lock_bh(&bc_lock); | |
812 | if (bcbearer) { | |
4323add6 | 813 | tipc_link_stop(bcl); |
b97bf3fd PL |
814 | bcl = NULL; |
815 | kfree(bclink); | |
816 | bclink = NULL; | |
817 | kfree(bcbearer); | |
818 | bcbearer = NULL; | |
819 | } | |
820 | spin_unlock_bh(&bc_lock); | |
821 | } | |
822 | ||
3e22e62b AS |
823 | |
824 | /** | |
825 | * tipc_nmap_add - add a node to a node map | |
826 | */ | |
827 | ||
828 | void tipc_nmap_add(struct tipc_node_map *nm_ptr, u32 node) | |
829 | { | |
830 | int n = tipc_node(node); | |
831 | int w = n / WSIZE; | |
832 | u32 mask = (1 << (n % WSIZE)); | |
833 | ||
834 | if ((nm_ptr->map[w] & mask) == 0) { | |
835 | nm_ptr->count++; | |
836 | nm_ptr->map[w] |= mask; | |
837 | } | |
838 | } | |
839 | ||
840 | /** | |
841 | * tipc_nmap_remove - remove a node from a node map | |
842 | */ | |
843 | ||
844 | void tipc_nmap_remove(struct tipc_node_map *nm_ptr, u32 node) | |
845 | { | |
846 | int n = tipc_node(node); | |
847 | int w = n / WSIZE; | |
848 | u32 mask = (1 << (n % WSIZE)); | |
849 | ||
850 | if ((nm_ptr->map[w] & mask) != 0) { | |
851 | nm_ptr->map[w] &= ~mask; | |
852 | nm_ptr->count--; | |
853 | } | |
854 | } | |
855 | ||
856 | /** | |
857 | * tipc_nmap_diff - find differences between node maps | |
858 | * @nm_a: input node map A | |
859 | * @nm_b: input node map B | |
860 | * @nm_diff: output node map A-B (i.e. nodes of A that are not in B) | |
861 | */ | |
862 | ||
31e3c3f6 | 863 | static void tipc_nmap_diff(struct tipc_node_map *nm_a, |
864 | struct tipc_node_map *nm_b, | |
865 | struct tipc_node_map *nm_diff) | |
3e22e62b AS |
866 | { |
867 | int stop = ARRAY_SIZE(nm_a->map); | |
868 | int w; | |
869 | int b; | |
870 | u32 map; | |
871 | ||
872 | memset(nm_diff, 0, sizeof(*nm_diff)); | |
873 | for (w = 0; w < stop; w++) { | |
874 | map = nm_a->map[w] ^ (nm_a->map[w] & nm_b->map[w]); | |
875 | nm_diff->map[w] = map; | |
876 | if (map != 0) { | |
877 | for (b = 0 ; b < WSIZE; b++) { | |
878 | if (map & (1 << b)) | |
879 | nm_diff->count++; | |
880 | } | |
881 | } | |
882 | } | |
883 | } | |
43608edc AS |
884 | |
885 | /** | |
886 | * tipc_port_list_add - add a port to a port list, ensuring no duplicates | |
887 | */ | |
888 | ||
889 | void tipc_port_list_add(struct port_list *pl_ptr, u32 port) | |
890 | { | |
891 | struct port_list *item = pl_ptr; | |
892 | int i; | |
893 | int item_sz = PLSIZE; | |
894 | int cnt = pl_ptr->count; | |
895 | ||
896 | for (; ; cnt -= item_sz, item = item->next) { | |
897 | if (cnt < PLSIZE) | |
898 | item_sz = cnt; | |
899 | for (i = 0; i < item_sz; i++) | |
900 | if (item->ports[i] == port) | |
901 | return; | |
902 | if (i < PLSIZE) { | |
903 | item->ports[i] = port; | |
904 | pl_ptr->count++; | |
905 | return; | |
906 | } | |
907 | if (!item->next) { | |
908 | item->next = kmalloc(sizeof(*item), GFP_ATOMIC); | |
909 | if (!item->next) { | |
910 | warn("Incomplete multicast delivery, no memory\n"); | |
911 | return; | |
912 | } | |
913 | item->next->next = NULL; | |
914 | } | |
915 | } | |
916 | } | |
917 | ||
918 | /** | |
919 | * tipc_port_list_free - free dynamically created entries in port_list chain | |
920 | * | |
921 | */ | |
922 | ||
923 | void tipc_port_list_free(struct port_list *pl_ptr) | |
924 | { | |
925 | struct port_list *item; | |
926 | struct port_list *next; | |
927 | ||
928 | for (item = pl_ptr->next; item; item = next) { | |
929 | next = item->next; | |
930 | kfree(item); | |
931 | } | |
932 | } | |
933 |