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NFS: Split fs/nfs/inode.c
[wrt350n-kernel.git] / net / tipc / link.c
blob784b24b6d102bca6d74a07473ed03692fd9bc820
1 /*
2 * net/tipc/link.c: TIPC link code
3 *
4 * Copyright (c) 1996-2006, Ericsson AB
5 * Copyright (c) 2004-2005, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37 #include "core.h"
38 #include "dbg.h"
39 #include "link.h"
40 #include "net.h"
41 #include "node.h"
42 #include "port.h"
43 #include "addr.h"
44 #include "node_subscr.h"
45 #include "name_distr.h"
46 #include "bearer.h"
47 #include "name_table.h"
48 #include "discover.h"
49 #include "config.h"
50 #include "bcast.h"
51
52
53 /*
54 * Limit for deferred reception queue:
55 */
56
57 #define DEF_QUEUE_LIMIT 256u
58
59 /*
60 * Link state events:
61 */
62
63 #define STARTING_EVT 856384768 /* link processing trigger */
64 #define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
65 #define TIMEOUT_EVT 560817u /* link timer expired */
66
67 /*
68 * The following two 'message types' is really just implementation
69 * data conveniently stored in the message header.
70 * They must not be considered part of the protocol
71 */
72 #define OPEN_MSG 0
73 #define CLOSED_MSG 1
74
75 /*
76 * State value stored in 'exp_msg_count'
77 */
78
79 #define START_CHANGEOVER 100000u
80
81 /**
82 * struct link_name - deconstructed link name
83 * @addr_local: network address of node at this end
84 * @if_local: name of interface at this end
85 * @addr_peer: network address of node at far end
86 * @if_peer: name of interface at far end
87 */
88
89 struct link_name {
90 u32 addr_local;
91 char if_local[TIPC_MAX_IF_NAME];
92 u32 addr_peer;
93 char if_peer[TIPC_MAX_IF_NAME];
94 };
95
96 #if 0
97
98 /* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
99
100 /**
101 * struct link_event - link up/down event notification
102 */
103
104 struct link_event {
105 u32 addr;
106 int up;
107 void (*fcn)(u32, char *, int);
108 char name[TIPC_MAX_LINK_NAME];
109 };
110
111 #endif
112
113 static void link_handle_out_of_seq_msg(struct link *l_ptr,
114 struct sk_buff *buf);
115 static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf);
116 static int link_recv_changeover_msg(struct link **l_ptr, struct sk_buff **buf);
117 static void link_set_supervision_props(struct link *l_ptr, u32 tolerance);
118 static int link_send_sections_long(struct port *sender,
119 struct iovec const *msg_sect,
120 u32 num_sect, u32 destnode);
121 static void link_check_defragm_bufs(struct link *l_ptr);
122 static void link_state_event(struct link *l_ptr, u32 event);
123 static void link_reset_statistics(struct link *l_ptr);
124 static void link_print(struct link *l_ptr, struct print_buf *buf,
125 const char *str);
126
127 /*
128 * Debugging code used by link routines only
129 *
130 * When debugging link problems on a system that has multiple links,
131 * the standard TIPC debugging routines may not be useful since they
132 * allow the output from multiple links to be intermixed. For this reason
133 * routines of the form "dbg_link_XXX()" have been created that will capture
134 * debug info into a link's personal print buffer, which can then be dumped
135 * into the TIPC system log (LOG) upon request.
136 *
137 * To enable per-link debugging, use LINK_LOG_BUF_SIZE to specify the size
138 * of the print buffer used by each link. If LINK_LOG_BUF_SIZE is set to 0,
139 * the dbg_link_XXX() routines simply send their output to the standard
140 * debug print buffer (DBG_OUTPUT), if it has been defined; this can be useful
141 * when there is only a single link in the system being debugged.
142 *
143 * Notes:
144 * - When enabled, LINK_LOG_BUF_SIZE should be set to at least 1000 (bytes)
145 * - "l_ptr" must be valid when using dbg_link_XXX() macros
146 */
147
148 #define LINK_LOG_BUF_SIZE 0
149
150 #define dbg_link(fmt, arg...) do {if (LINK_LOG_BUF_SIZE) tipc_printf(&l_ptr->print_buf, fmt, ## arg); } while(0)
151 #define dbg_link_msg(msg, txt) do {if (LINK_LOG_BUF_SIZE) tipc_msg_print(&l_ptr->print_buf, msg, txt); } while(0)
152 #define dbg_link_state(txt) do {if (LINK_LOG_BUF_SIZE) link_print(l_ptr, &l_ptr->print_buf, txt); } while(0)
153 #define dbg_link_dump() do { \
154 if (LINK_LOG_BUF_SIZE) { \
155 tipc_printf(LOG, "\n\nDumping link <%s>:\n", l_ptr->name); \
156 tipc_printbuf_move(LOG, &l_ptr->print_buf); \
157 } \
158 } while (0)
159
160 static void dbg_print_link(struct link *l_ptr, const char *str)
161 {
162 if (DBG_OUTPUT)
163 link_print(l_ptr, DBG_OUTPUT, str);
164 }
165
166 static void dbg_print_buf_chain(struct sk_buff *root_buf)
167 {
168 if (DBG_OUTPUT) {
169 struct sk_buff *buf = root_buf;
170
171 while (buf) {
172 msg_dbg(buf_msg(buf), "In chain: ");
173 buf = buf->next;
174 }
175 }
176 }
177
178 /*
179 * Simple link routines
180 */
181
182 static unsigned int align(unsigned int i)
183 {
184 return (i + 3) & ~3u;
185 }
186
187 static int link_working_working(struct link *l_ptr)
188 {
189 return (l_ptr->state == WORKING_WORKING);
190 }
191
192 static int link_working_unknown(struct link *l_ptr)
193 {
194 return (l_ptr->state == WORKING_UNKNOWN);
195 }
196
197 static int link_reset_unknown(struct link *l_ptr)
198 {
199 return (l_ptr->state == RESET_UNKNOWN);
200 }
201
202 static int link_reset_reset(struct link *l_ptr)
203 {
204 return (l_ptr->state == RESET_RESET);
205 }
206
207 static int link_blocked(struct link *l_ptr)
208 {
209 return (l_ptr->exp_msg_count || l_ptr->blocked);
210 }
211
212 static int link_congested(struct link *l_ptr)
213 {
214 return (l_ptr->out_queue_size >= l_ptr->queue_limit[0]);
215 }
216
217 static u32 link_max_pkt(struct link *l_ptr)
218 {
219 return l_ptr->max_pkt;
220 }
221
222 static void link_init_max_pkt(struct link *l_ptr)
223 {
224 u32 max_pkt;
225
226 max_pkt = (l_ptr->b_ptr->publ.mtu & ~3);
227 if (max_pkt > MAX_MSG_SIZE)
228 max_pkt = MAX_MSG_SIZE;
229
230 l_ptr->max_pkt_target = max_pkt;
231 if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT)
232 l_ptr->max_pkt = l_ptr->max_pkt_target;
233 else
234 l_ptr->max_pkt = MAX_PKT_DEFAULT;
235
236 l_ptr->max_pkt_probes = 0;
237 }
238
239 static u32 link_next_sent(struct link *l_ptr)
240 {
241 if (l_ptr->next_out)
242 return msg_seqno(buf_msg(l_ptr->next_out));
243 return mod(l_ptr->next_out_no);
244 }
245
246 static u32 link_last_sent(struct link *l_ptr)
247 {
248 return mod(link_next_sent(l_ptr) - 1);
249 }
250
251 /*
252 * Simple non-static link routines (i.e. referenced outside this file)
253 */
254
255 int tipc_link_is_up(struct link *l_ptr)
256 {
257 if (!l_ptr)
258 return 0;
259 return (link_working_working(l_ptr) || link_working_unknown(l_ptr));
260 }
261
262 int tipc_link_is_active(struct link *l_ptr)
263 {
264 return ((l_ptr->owner->active_links[0] == l_ptr) ||
265 (l_ptr->owner->active_links[1] == l_ptr));
266 }
267
268 /**
269 * link_name_validate - validate & (optionally) deconstruct link name
270 * @name - ptr to link name string
271 * @name_parts - ptr to area for link name components (or NULL if not needed)
272 *
273 * Returns 1 if link name is valid, otherwise 0.
274 */
275
276 static int link_name_validate(const char *name, struct link_name *name_parts)
277 {
278 char name_copy[TIPC_MAX_LINK_NAME];
279 char *addr_local;
280 char *if_local;
281 char *addr_peer;
282 char *if_peer;
283 char dummy;
284 u32 z_local, c_local, n_local;
285 u32 z_peer, c_peer, n_peer;
286 u32 if_local_len;
287 u32 if_peer_len;
288
289 /* copy link name & ensure length is OK */
290
291 name_copy[TIPC_MAX_LINK_NAME - 1] = 0;
292 /* need above in case non-Posix strncpy() doesn't pad with nulls */
293 strncpy(name_copy, name, TIPC_MAX_LINK_NAME);
294 if (name_copy[TIPC_MAX_LINK_NAME - 1] != 0)
295 return 0;
296
297 /* ensure all component parts of link name are present */
298
299 addr_local = name_copy;
300 if ((if_local = strchr(addr_local, ':')) == NULL)
301 return 0;
302 *(if_local++) = 0;
303 if ((addr_peer = strchr(if_local, '-')) == NULL)
304 return 0;
305 *(addr_peer++) = 0;
306 if_local_len = addr_peer - if_local;
307 if ((if_peer = strchr(addr_peer, ':')) == NULL)
308 return 0;
309 *(if_peer++) = 0;
310 if_peer_len = strlen(if_peer) + 1;
311
312 /* validate component parts of link name */
313
314 if ((sscanf(addr_local, "%u.%u.%u%c",
315 &z_local, &c_local, &n_local, &dummy) != 3) ||
316 (sscanf(addr_peer, "%u.%u.%u%c",
317 &z_peer, &c_peer, &n_peer, &dummy) != 3) ||
318 (z_local > 255) || (c_local > 4095) || (n_local > 4095) ||
319 (z_peer > 255) || (c_peer > 4095) || (n_peer > 4095) ||
320 (if_local_len <= 1) || (if_local_len > TIPC_MAX_IF_NAME) ||
321 (if_peer_len <= 1) || (if_peer_len > TIPC_MAX_IF_NAME) ||
322 (strspn(if_local, tipc_alphabet) != (if_local_len - 1)) ||
323 (strspn(if_peer, tipc_alphabet) != (if_peer_len - 1)))
324 return 0;
325
326 /* return link name components, if necessary */
327
328 if (name_parts) {
329 name_parts->addr_local = tipc_addr(z_local, c_local, n_local);
330 strcpy(name_parts->if_local, if_local);
331 name_parts->addr_peer = tipc_addr(z_peer, c_peer, n_peer);
332 strcpy(name_parts->if_peer, if_peer);
333 }
334 return 1;
335 }
336
337 /**
338 * link_timeout - handle expiration of link timer
339 * @l_ptr: pointer to link
340 *
341 * This routine must not grab "tipc_net_lock" to avoid a potential deadlock conflict
342 * with tipc_link_delete(). (There is no risk that the node will be deleted by
343 * another thread because tipc_link_delete() always cancels the link timer before
344 * tipc_node_delete() is called.)
345 */
346
347 static void link_timeout(struct link *l_ptr)
348 {
349 tipc_node_lock(l_ptr->owner);
350
351 /* update counters used in statistical profiling of send traffic */
352
353 l_ptr->stats.accu_queue_sz += l_ptr->out_queue_size;
354 l_ptr->stats.queue_sz_counts++;
355
356 if (l_ptr->out_queue_size > l_ptr->stats.max_queue_sz)
357 l_ptr->stats.max_queue_sz = l_ptr->out_queue_size;
358
359 if (l_ptr->first_out) {
360 struct tipc_msg *msg = buf_msg(l_ptr->first_out);
361 u32 length = msg_size(msg);
362
363 if ((msg_user(msg) == MSG_FRAGMENTER)
364 && (msg_type(msg) == FIRST_FRAGMENT)) {
365 length = msg_size(msg_get_wrapped(msg));
366 }
367 if (length) {
368 l_ptr->stats.msg_lengths_total += length;
369 l_ptr->stats.msg_length_counts++;
370 if (length <= 64)
371 l_ptr->stats.msg_length_profile[0]++;
372 else if (length <= 256)
373 l_ptr->stats.msg_length_profile[1]++;
374 else if (length <= 1024)
375 l_ptr->stats.msg_length_profile[2]++;
376 else if (length <= 4096)
377 l_ptr->stats.msg_length_profile[3]++;
378 else if (length <= 16384)
379 l_ptr->stats.msg_length_profile[4]++;
380 else if (length <= 32768)
381 l_ptr->stats.msg_length_profile[5]++;
382 else
383 l_ptr->stats.msg_length_profile[6]++;
384 }
385 }
386
387 /* do all other link processing performed on a periodic basis */
388
389 link_check_defragm_bufs(l_ptr);
390
391 link_state_event(l_ptr, TIMEOUT_EVT);
392
393 if (l_ptr->next_out)
394 tipc_link_push_queue(l_ptr);
395
396 tipc_node_unlock(l_ptr->owner);
397 }
398
399 static void link_set_timer(struct link *l_ptr, u32 time)
400 {
401 k_start_timer(&l_ptr->timer, time);
402 }
403
404 /**
405 * tipc_link_create - create a new link
406 * @b_ptr: pointer to associated bearer
407 * @peer: network address of node at other end of link
408 * @media_addr: media address to use when sending messages over link
409 *
410 * Returns pointer to link.
411 */
412
413 struct link *tipc_link_create(struct bearer *b_ptr, const u32 peer,
414 const struct tipc_media_addr *media_addr)
415 {
416 struct link *l_ptr;
417 struct tipc_msg *msg;
418 char *if_name;
419
420 l_ptr = (struct link *)kmalloc(sizeof(*l_ptr), GFP_ATOMIC);
421 if (!l_ptr) {
422 warn("Memory squeeze; Failed to create link\n");
423 return NULL;
424 }
425 memset(l_ptr, 0, sizeof(*l_ptr));
426
427 l_ptr->addr = peer;
428 if_name = strchr(b_ptr->publ.name, ':') + 1;
429 sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:",
430 tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
431 tipc_node(tipc_own_addr),
432 if_name,
433 tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
434 /* note: peer i/f is appended to link name by reset/activate */
435 memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
436 k_init_timer(&l_ptr->timer, (Handler)link_timeout, (unsigned long)l_ptr);
437 list_add_tail(&l_ptr->link_list, &b_ptr->links);
438 l_ptr->checkpoint = 1;
439 l_ptr->b_ptr = b_ptr;
440 link_set_supervision_props(l_ptr, b_ptr->media->tolerance);
441 l_ptr->state = RESET_UNKNOWN;
442
443 l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
444 msg = l_ptr->pmsg;
445 msg_init(msg, LINK_PROTOCOL, RESET_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
446 msg_set_size(msg, sizeof(l_ptr->proto_msg));
447 msg_set_session(msg, tipc_random);
448 msg_set_bearer_id(msg, b_ptr->identity);
449 strcpy((char *)msg_data(msg), if_name);
450
451 l_ptr->priority = b_ptr->priority;
452 tipc_link_set_queue_limits(l_ptr, b_ptr->media->window);
453
454 link_init_max_pkt(l_ptr);
455
456 l_ptr->next_out_no = 1;
457 INIT_LIST_HEAD(&l_ptr->waiting_ports);
458
459 link_reset_statistics(l_ptr);
460
461 l_ptr->owner = tipc_node_attach_link(l_ptr);
462 if (!l_ptr->owner) {
463 kfree(l_ptr);
464 return NULL;
465 }
466
467 if (LINK_LOG_BUF_SIZE) {
468 char *pb = kmalloc(LINK_LOG_BUF_SIZE, GFP_ATOMIC);
469
470 if (!pb) {
471 kfree(l_ptr);
472 warn("Memory squeeze; Failed to create link\n");
473 return NULL;
474 }
475 tipc_printbuf_init(&l_ptr->print_buf, pb, LINK_LOG_BUF_SIZE);
476 }
477
478 tipc_k_signal((Handler)tipc_link_start, (unsigned long)l_ptr);
479
480 dbg("tipc_link_create(): tolerance = %u,cont intv = %u, abort_limit = %u\n",
481 l_ptr->tolerance, l_ptr->continuity_interval, l_ptr->abort_limit);
482
483 return l_ptr;
484 }
485
486 /**
487 * tipc_link_delete - delete a link
488 * @l_ptr: pointer to link
489 *
490 * Note: 'tipc_net_lock' is write_locked, bearer is locked.
491 * This routine must not grab the node lock until after link timer cancellation
492 * to avoid a potential deadlock situation.
493 */
494
495 void tipc_link_delete(struct link *l_ptr)
496 {
497 if (!l_ptr) {
498 err("Attempt to delete non-existent link\n");
499 return;
500 }
501
502 dbg("tipc_link_delete()\n");
503
504 k_cancel_timer(&l_ptr->timer);
505
506 tipc_node_lock(l_ptr->owner);
507 tipc_link_reset(l_ptr);
508 tipc_node_detach_link(l_ptr->owner, l_ptr);
509 tipc_link_stop(l_ptr);
510 list_del_init(&l_ptr->link_list);
511 if (LINK_LOG_BUF_SIZE)
512 kfree(l_ptr->print_buf.buf);
513 tipc_node_unlock(l_ptr->owner);
514 k_term_timer(&l_ptr->timer);
515 kfree(l_ptr);
516 }
517
518 void tipc_link_start(struct link *l_ptr)
519 {
520 dbg("tipc_link_start %x\n", l_ptr);
521 link_state_event(l_ptr, STARTING_EVT);
522 }
523
524 /**
525 * link_schedule_port - schedule port for deferred sending
526 * @l_ptr: pointer to link
527 * @origport: reference to sending port
528 * @sz: amount of data to be sent
529 *
530 * Schedules port for renewed sending of messages after link congestion
531 * has abated.
532 */
533
534 static int link_schedule_port(struct link *l_ptr, u32 origport, u32 sz)
535 {
536 struct port *p_ptr;
537
538 spin_lock_bh(&tipc_port_list_lock);
539 p_ptr = tipc_port_lock(origport);
540 if (p_ptr) {
541 if (!p_ptr->wakeup)
542 goto exit;
543 if (!list_empty(&p_ptr->wait_list))
544 goto exit;
545 p_ptr->congested_link = l_ptr;
546 p_ptr->publ.congested = 1;
547 p_ptr->waiting_pkts = 1 + ((sz - 1) / link_max_pkt(l_ptr));
548 list_add_tail(&p_ptr->wait_list, &l_ptr->waiting_ports);
549 l_ptr->stats.link_congs++;
550 exit:
551 tipc_port_unlock(p_ptr);
552 }
553 spin_unlock_bh(&tipc_port_list_lock);
554 return -ELINKCONG;
555 }
556
557 void tipc_link_wakeup_ports(struct link *l_ptr, int all)
558 {
559 struct port *p_ptr;
560 struct port *temp_p_ptr;
561 int win = l_ptr->queue_limit[0] - l_ptr->out_queue_size;
562
563 if (all)
564 win = 100000;
565 if (win <= 0)
566 return;
567 if (!spin_trylock_bh(&tipc_port_list_lock))
568 return;
569 if (link_congested(l_ptr))
570 goto exit;
571 list_for_each_entry_safe(p_ptr, temp_p_ptr, &l_ptr->waiting_ports,
572 wait_list) {
573 if (win <= 0)
574 break;
575 list_del_init(&p_ptr->wait_list);
576 p_ptr->congested_link = NULL;
577 assert(p_ptr->wakeup);
578 spin_lock_bh(p_ptr->publ.lock);
579 p_ptr->publ.congested = 0;
580 p_ptr->wakeup(&p_ptr->publ);
581 win -= p_ptr->waiting_pkts;
582 spin_unlock_bh(p_ptr->publ.lock);
583 }
584
585 exit:
586 spin_unlock_bh(&tipc_port_list_lock);
587 }
588
589 /**
590 * link_release_outqueue - purge link's outbound message queue
591 * @l_ptr: pointer to link
592 */
593
594 static void link_release_outqueue(struct link *l_ptr)
595 {
596 struct sk_buff *buf = l_ptr->first_out;
597 struct sk_buff *next;
598
599 while (buf) {
600 next = buf->next;
601 buf_discard(buf);
602 buf = next;
603 }
604 l_ptr->first_out = NULL;
605 l_ptr->out_queue_size = 0;
606 }
607
608 /**
609 * tipc_link_reset_fragments - purge link's inbound message fragments queue
610 * @l_ptr: pointer to link
611 */
612
613 void tipc_link_reset_fragments(struct link *l_ptr)
614 {
615 struct sk_buff *buf = l_ptr->defragm_buf;
616 struct sk_buff *next;
617
618 while (buf) {
619 next = buf->next;
620 buf_discard(buf);
621 buf = next;
622 }
623 l_ptr->defragm_buf = NULL;
624 }
625
626 /**
627 * tipc_link_stop - purge all inbound and outbound messages associated with link
628 * @l_ptr: pointer to link
629 */
630
631 void tipc_link_stop(struct link *l_ptr)
632 {
633 struct sk_buff *buf;
634 struct sk_buff *next;
635
636 buf = l_ptr->oldest_deferred_in;
637 while (buf) {
638 next = buf->next;
639 buf_discard(buf);
640 buf = next;
641 }
642
643 buf = l_ptr->first_out;
644 while (buf) {
645 next = buf->next;
646 buf_discard(buf);
647 buf = next;
648 }
649
650 tipc_link_reset_fragments(l_ptr);
651
652 buf_discard(l_ptr->proto_msg_queue);
653 l_ptr->proto_msg_queue = NULL;
654 }
655
656 #if 0
657
658 /* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
659
660 static void link_recv_event(struct link_event *ev)
661 {
662 ev->fcn(ev->addr, ev->name, ev->up);
663 kfree(ev);
664 }
665
666 static void link_send_event(void (*fcn)(u32 a, char *n, int up),
667 struct link *l_ptr, int up)
668 {
669 struct link_event *ev;
670
671 ev = kmalloc(sizeof(*ev), GFP_ATOMIC);
672 if (!ev) {
673 warn("Link event allocation failure\n");
674 return;
675 }
676 ev->addr = l_ptr->addr;
677 ev->up = up;
678 ev->fcn = fcn;
679 memcpy(ev->name, l_ptr->name, TIPC_MAX_LINK_NAME);
680 tipc_k_signal((Handler)link_recv_event, (unsigned long)ev);
681 }
682
683 #else
684
685 #define link_send_event(fcn, l_ptr, up) do { } while (0)
686
687 #endif
688
689 void tipc_link_reset(struct link *l_ptr)
690 {
691 struct sk_buff *buf;
692 u32 prev_state = l_ptr->state;
693 u32 checkpoint = l_ptr->next_in_no;
694
695 msg_set_session(l_ptr->pmsg, msg_session(l_ptr->pmsg) + 1);
696
697 /* Link is down, accept any session: */
698 l_ptr->peer_session = 0;
699
700 /* Prepare for max packet size negotiation */
701 link_init_max_pkt(l_ptr);
702
703 l_ptr->state = RESET_UNKNOWN;
704 dbg_link_state("Resetting Link\n");
705
706 if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
707 return;
708
709 tipc_node_link_down(l_ptr->owner, l_ptr);
710 tipc_bearer_remove_dest(l_ptr->b_ptr, l_ptr->addr);
711 #if 0
712 tipc_printf(TIPC_CONS, "\nReset link <%s>\n", l_ptr->name);
713 dbg_link_dump();
714 #endif
715 if (tipc_node_has_active_links(l_ptr->owner) &&
716 l_ptr->owner->permit_changeover) {
717 l_ptr->reset_checkpoint = checkpoint;
718 l_ptr->exp_msg_count = START_CHANGEOVER;
719 }
720
721 /* Clean up all queues: */
722
723 link_release_outqueue(l_ptr);
724 buf_discard(l_ptr->proto_msg_queue);
725 l_ptr->proto_msg_queue = NULL;
726 buf = l_ptr->oldest_deferred_in;
727 while (buf) {
728 struct sk_buff *next = buf->next;
729 buf_discard(buf);
730 buf = next;
731 }
732 if (!list_empty(&l_ptr->waiting_ports))
733 tipc_link_wakeup_ports(l_ptr, 1);
734
735 l_ptr->retransm_queue_head = 0;
736 l_ptr->retransm_queue_size = 0;
737 l_ptr->last_out = NULL;
738 l_ptr->first_out = NULL;
739 l_ptr->next_out = NULL;
740 l_ptr->unacked_window = 0;
741 l_ptr->checkpoint = 1;
742 l_ptr->next_out_no = 1;
743 l_ptr->deferred_inqueue_sz = 0;
744 l_ptr->oldest_deferred_in = NULL;
745 l_ptr->newest_deferred_in = NULL;
746 l_ptr->fsm_msg_cnt = 0;
747 l_ptr->stale_count = 0;
748 link_reset_statistics(l_ptr);
749
750 link_send_event(tipc_cfg_link_event, l_ptr, 0);
751 if (!in_own_cluster(l_ptr->addr))
752 link_send_event(tipc_disc_link_event, l_ptr, 0);
753 }
754
755
756 static void link_activate(struct link *l_ptr)
757 {
758 l_ptr->next_in_no = 1;
759 tipc_node_link_up(l_ptr->owner, l_ptr);
760 tipc_bearer_add_dest(l_ptr->b_ptr, l_ptr->addr);
761 link_send_event(tipc_cfg_link_event, l_ptr, 1);
762 if (!in_own_cluster(l_ptr->addr))
763 link_send_event(tipc_disc_link_event, l_ptr, 1);
764 }
765
766 /**
767 * link_state_event - link finite state machine
768 * @l_ptr: pointer to link
769 * @event: state machine event to process
770 */
771
772 static void link_state_event(struct link *l_ptr, unsigned event)
773 {
774 struct link *other;
775 u32 cont_intv = l_ptr->continuity_interval;
776
777 if (!l_ptr->started && (event != STARTING_EVT))
778 return; /* Not yet. */
779
780 if (link_blocked(l_ptr)) {
781 if (event == TIMEOUT_EVT) {
782 link_set_timer(l_ptr, cont_intv);
783 }
784 return; /* Changeover going on */
785 }
786 dbg_link("STATE_EV: <%s> ", l_ptr->name);
787
788 switch (l_ptr->state) {
789 case WORKING_WORKING:
790 dbg_link("WW/");
791 switch (event) {
792 case TRAFFIC_MSG_EVT:
793 dbg_link("TRF-");
794 /* fall through */
795 case ACTIVATE_MSG:
796 dbg_link("ACT\n");
797 break;
798 case TIMEOUT_EVT:
799 dbg_link("TIM ");
800 if (l_ptr->next_in_no != l_ptr->checkpoint) {
801 l_ptr->checkpoint = l_ptr->next_in_no;
802 if (tipc_bclink_acks_missing(l_ptr->owner)) {
803 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
804 0, 0, 0, 0, 0);
805 l_ptr->fsm_msg_cnt++;
806 } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) {
807 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
808 1, 0, 0, 0, 0);
809 l_ptr->fsm_msg_cnt++;
810 }
811 link_set_timer(l_ptr, cont_intv);
812 break;
813 }
814 dbg_link(" -> WU\n");
815 l_ptr->state = WORKING_UNKNOWN;
816 l_ptr->fsm_msg_cnt = 0;
817 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
818 l_ptr->fsm_msg_cnt++;
819 link_set_timer(l_ptr, cont_intv / 4);
820 break;
821 case RESET_MSG:
822 dbg_link("RES -> RR\n");
823 tipc_link_reset(l_ptr);
824 l_ptr->state = RESET_RESET;
825 l_ptr->fsm_msg_cnt = 0;
826 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
827 l_ptr->fsm_msg_cnt++;
828 link_set_timer(l_ptr, cont_intv);
829 break;
830 default:
831 err("Unknown link event %u in WW state\n", event);
832 }
833 break;
834 case WORKING_UNKNOWN:
835 dbg_link("WU/");
836 switch (event) {
837 case TRAFFIC_MSG_EVT:
838 dbg_link("TRF-");
839 case ACTIVATE_MSG:
840 dbg_link("ACT -> WW\n");
841 l_ptr->state = WORKING_WORKING;
842 l_ptr->fsm_msg_cnt = 0;
843 link_set_timer(l_ptr, cont_intv);
844 break;
845 case RESET_MSG:
846 dbg_link("RES -> RR\n");
847 tipc_link_reset(l_ptr);
848 l_ptr->state = RESET_RESET;
849 l_ptr->fsm_msg_cnt = 0;
850 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
851 l_ptr->fsm_msg_cnt++;
852 link_set_timer(l_ptr, cont_intv);
853 break;
854 case TIMEOUT_EVT:
855 dbg_link("TIM ");
856 if (l_ptr->next_in_no != l_ptr->checkpoint) {
857 dbg_link("-> WW \n");
858 l_ptr->state = WORKING_WORKING;
859 l_ptr->fsm_msg_cnt = 0;
860 l_ptr->checkpoint = l_ptr->next_in_no;
861 if (tipc_bclink_acks_missing(l_ptr->owner)) {
862 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
863 0, 0, 0, 0, 0);
864 l_ptr->fsm_msg_cnt++;
865 }
866 link_set_timer(l_ptr, cont_intv);
867 } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
868 dbg_link("Probing %u/%u,timer = %u ms)\n",
869 l_ptr->fsm_msg_cnt, l_ptr->abort_limit,
870 cont_intv / 4);
871 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
872 1, 0, 0, 0, 0);
873 l_ptr->fsm_msg_cnt++;
874 link_set_timer(l_ptr, cont_intv / 4);
875 } else { /* Link has failed */
876 dbg_link("-> RU (%u probes unanswered)\n",
877 l_ptr->fsm_msg_cnt);
878 tipc_link_reset(l_ptr);
879 l_ptr->state = RESET_UNKNOWN;
880 l_ptr->fsm_msg_cnt = 0;
881 tipc_link_send_proto_msg(l_ptr, RESET_MSG,
882 0, 0, 0, 0, 0);
883 l_ptr->fsm_msg_cnt++;
884 link_set_timer(l_ptr, cont_intv);
885 }
886 break;
887 default:
888 err("Unknown link event %u in WU state\n", event);
889 }
890 break;
891 case RESET_UNKNOWN:
892 dbg_link("RU/");
893 switch (event) {
894 case TRAFFIC_MSG_EVT:
895 dbg_link("TRF-\n");
896 break;
897 case ACTIVATE_MSG:
898 other = l_ptr->owner->active_links[0];
899 if (other && link_working_unknown(other)) {
900 dbg_link("ACT\n");
901 break;
902 }
903 dbg_link("ACT -> WW\n");
904 l_ptr->state = WORKING_WORKING;
905 l_ptr->fsm_msg_cnt = 0;
906 link_activate(l_ptr);
907 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
908 l_ptr->fsm_msg_cnt++;
909 link_set_timer(l_ptr, cont_intv);
910 break;
911 case RESET_MSG:
912 dbg_link("RES \n");
913 dbg_link(" -> RR\n");
914 l_ptr->state = RESET_RESET;
915 l_ptr->fsm_msg_cnt = 0;
916 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 1, 0, 0, 0, 0);
917 l_ptr->fsm_msg_cnt++;
918 link_set_timer(l_ptr, cont_intv);
919 break;
920 case STARTING_EVT:
921 dbg_link("START-");
922 l_ptr->started = 1;
923 /* fall through */
924 case TIMEOUT_EVT:
925 dbg_link("TIM \n");
926 tipc_link_send_proto_msg(l_ptr, RESET_MSG, 0, 0, 0, 0, 0);
927 l_ptr->fsm_msg_cnt++;
928 link_set_timer(l_ptr, cont_intv);
929 break;
930 default:
931 err("Unknown link event %u in RU state\n", event);
932 }
933 break;
934 case RESET_RESET:
935 dbg_link("RR/ ");
936 switch (event) {
937 case TRAFFIC_MSG_EVT:
938 dbg_link("TRF-");
939 /* fall through */
940 case ACTIVATE_MSG:
941 other = l_ptr->owner->active_links[0];
942 if (other && link_working_unknown(other)) {
943 dbg_link("ACT\n");
944 break;
945 }
946 dbg_link("ACT -> WW\n");
947 l_ptr->state = WORKING_WORKING;
948 l_ptr->fsm_msg_cnt = 0;
949 link_activate(l_ptr);
950 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
951 l_ptr->fsm_msg_cnt++;
952 link_set_timer(l_ptr, cont_intv);
953 break;
954 case RESET_MSG:
955 dbg_link("RES\n");
956 break;
957 case TIMEOUT_EVT:
958 dbg_link("TIM\n");
959 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
960 l_ptr->fsm_msg_cnt++;
961 link_set_timer(l_ptr, cont_intv);
962 dbg_link("fsm_msg_cnt %u\n", l_ptr->fsm_msg_cnt);
963 break;
964 default:
965 err("Unknown link event %u in RR state\n", event);
966 }
967 break;
968 default:
969 err("Unknown link state %u/%u\n", l_ptr->state, event);
970 }
971 }
972
973 /*
974 * link_bundle_buf(): Append contents of a buffer to
975 * the tail of an existing one.
976 */
977
978 static int link_bundle_buf(struct link *l_ptr,
979 struct sk_buff *bundler,
980 struct sk_buff *buf)
981 {
982 struct tipc_msg *bundler_msg = buf_msg(bundler);
983 struct tipc_msg *msg = buf_msg(buf);
984 u32 size = msg_size(msg);
985 u32 to_pos = align(msg_size(bundler_msg));
986 u32 rest = link_max_pkt(l_ptr) - to_pos;
987
988 if (msg_user(bundler_msg) != MSG_BUNDLER)
989 return 0;
990 if (msg_type(bundler_msg) != OPEN_MSG)
991 return 0;
992 if (rest < align(size))
993 return 0;
994
995 skb_put(bundler, (to_pos - msg_size(bundler_msg)) + size);
996 memcpy(bundler->data + to_pos, buf->data, size);
997 msg_set_size(bundler_msg, to_pos + size);
998 msg_set_msgcnt(bundler_msg, msg_msgcnt(bundler_msg) + 1);
999 dbg("Packed msg # %u(%u octets) into pos %u in buf(#%u)\n",
1000 msg_msgcnt(bundler_msg), size, to_pos, msg_seqno(bundler_msg));
1001 msg_dbg(msg, "PACKD:");
1002 buf_discard(buf);
1003 l_ptr->stats.sent_bundled++;
1004 return 1;
1005 }
1006
1007 static void link_add_to_outqueue(struct link *l_ptr,
1008 struct sk_buff *buf,
1009 struct tipc_msg *msg)
1010 {
1011 u32 ack = mod(l_ptr->next_in_no - 1);
1012 u32 seqno = mod(l_ptr->next_out_no++);
1013
1014 msg_set_word(msg, 2, ((ack << 16) | seqno));
1015 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1016 buf->next = NULL;
1017 if (l_ptr->first_out) {
1018 l_ptr->last_out->next = buf;
1019 l_ptr->last_out = buf;
1020 } else
1021 l_ptr->first_out = l_ptr->last_out = buf;
1022 l_ptr->out_queue_size++;
1023 }
1024
1025 /*
1026 * tipc_link_send_buf() is the 'full path' for messages, called from
1027 * inside TIPC when the 'fast path' in tipc_send_buf
1028 * has failed, and from link_send()
1029 */
1030
1031 int tipc_link_send_buf(struct link *l_ptr, struct sk_buff *buf)
1032 {
1033 struct tipc_msg *msg = buf_msg(buf);
1034 u32 size = msg_size(msg);
1035 u32 dsz = msg_data_sz(msg);
1036 u32 queue_size = l_ptr->out_queue_size;
1037 u32 imp = msg_tot_importance(msg);
1038 u32 queue_limit = l_ptr->queue_limit[imp];
1039 u32 max_packet = link_max_pkt(l_ptr);
1040
1041 msg_set_prevnode(msg, tipc_own_addr); /* If routed message */
1042
1043 /* Match msg importance against queue limits: */
1044
1045 if (unlikely(queue_size >= queue_limit)) {
1046 if (imp <= TIPC_CRITICAL_IMPORTANCE) {
1047 return link_schedule_port(l_ptr, msg_origport(msg),
1048 size);
1049 }
1050 msg_dbg(msg, "TIPC: Congestion, throwing away\n");
1051 buf_discard(buf);
1052 if (imp > CONN_MANAGER) {
1053 warn("Resetting <%s>, send queue full", l_ptr->name);
1054 tipc_link_reset(l_ptr);
1055 }
1056 return dsz;
1057 }
1058
1059 /* Fragmentation needed ? */
1060
1061 if (size > max_packet)
1062 return tipc_link_send_long_buf(l_ptr, buf);
1063
1064 /* Packet can be queued or sent: */
1065
1066 if (queue_size > l_ptr->stats.max_queue_sz)
1067 l_ptr->stats.max_queue_sz = queue_size;
1068
1069 if (likely(!tipc_bearer_congested(l_ptr->b_ptr, l_ptr) &&
1070 !link_congested(l_ptr))) {
1071 link_add_to_outqueue(l_ptr, buf, msg);
1072
1073 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr))) {
1074 l_ptr->unacked_window = 0;
1075 } else {
1076 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
1077 l_ptr->stats.bearer_congs++;
1078 l_ptr->next_out = buf;
1079 }
1080 return dsz;
1081 }
1082 /* Congestion: can message be bundled ?: */
1083
1084 if ((msg_user(msg) != CHANGEOVER_PROTOCOL) &&
1085 (msg_user(msg) != MSG_FRAGMENTER)) {
1086
1087 /* Try adding message to an existing bundle */
1088
1089 if (l_ptr->next_out &&
1090 link_bundle_buf(l_ptr, l_ptr->last_out, buf)) {
1091 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
1092 return dsz;
1093 }
1094
1095 /* Try creating a new bundle */
1096
1097 if (size <= max_packet * 2 / 3) {
1098 struct sk_buff *bundler = buf_acquire(max_packet);
1099 struct tipc_msg bundler_hdr;
1100
1101 if (bundler) {
1102 msg_init(&bundler_hdr, MSG_BUNDLER, OPEN_MSG,
1103 TIPC_OK, INT_H_SIZE, l_ptr->addr);
1104 memcpy(bundler->data, (unchar *)&bundler_hdr,
1105 INT_H_SIZE);
1106 skb_trim(bundler, INT_H_SIZE);
1107 link_bundle_buf(l_ptr, bundler, buf);
1108 buf = bundler;
1109 msg = buf_msg(buf);
1110 l_ptr->stats.sent_bundles++;
1111 }
1112 }
1113 }
1114 if (!l_ptr->next_out)
1115 l_ptr->next_out = buf;
1116 link_add_to_outqueue(l_ptr, buf, msg);
1117 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
1118 return dsz;
1119 }
1120
1121 /*
1122 * tipc_link_send(): same as tipc_link_send_buf(), but the link to use has
1123 * not been selected yet, and the the owner node is not locked
1124 * Called by TIPC internal users, e.g. the name distributor
1125 */
1126
1127 int tipc_link_send(struct sk_buff *buf, u32 dest, u32 selector)
1128 {
1129 struct link *l_ptr;
1130 struct node *n_ptr;
1131 int res = -ELINKCONG;
1132
1133 read_lock_bh(&tipc_net_lock);
1134 n_ptr = tipc_node_select(dest, selector);
1135 if (n_ptr) {
1136 tipc_node_lock(n_ptr);
1137 l_ptr = n_ptr->active_links[selector & 1];
1138 dbg("tipc_link_send: found link %x for dest %x\n", l_ptr, dest);
1139 if (l_ptr) {
1140 res = tipc_link_send_buf(l_ptr, buf);
1141 }
1142 tipc_node_unlock(n_ptr);
1143 } else {
1144 dbg("Attempt to send msg to unknown node:\n");
1145 msg_dbg(buf_msg(buf),">>>");
1146 buf_discard(buf);
1147 }
1148 read_unlock_bh(&tipc_net_lock);
1149 return res;
1150 }
1151
1152 /*
1153 * link_send_buf_fast: Entry for data messages where the
1154 * destination link is known and the header is complete,
1155 * inclusive total message length. Very time critical.
1156 * Link is locked. Returns user data length.
1157 */
1158
1159 static int link_send_buf_fast(struct link *l_ptr, struct sk_buff *buf,
1160 u32 *used_max_pkt)
1161 {
1162 struct tipc_msg *msg = buf_msg(buf);
1163 int res = msg_data_sz(msg);
1164
1165 if (likely(!link_congested(l_ptr))) {
1166 if (likely(msg_size(msg) <= link_max_pkt(l_ptr))) {
1167 if (likely(list_empty(&l_ptr->b_ptr->cong_links))) {
1168 link_add_to_outqueue(l_ptr, buf, msg);
1169 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf,
1170 &l_ptr->media_addr))) {
1171 l_ptr->unacked_window = 0;
1172 msg_dbg(msg,"SENT_FAST:");
1173 return res;
1174 }
1175 dbg("failed sent fast...\n");
1176 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
1177 l_ptr->stats.bearer_congs++;
1178 l_ptr->next_out = buf;
1179 return res;
1180 }
1181 }
1182 else
1183 *used_max_pkt = link_max_pkt(l_ptr);
1184 }
1185 return tipc_link_send_buf(l_ptr, buf); /* All other cases */
1186 }
1187
1188 /*
1189 * tipc_send_buf_fast: Entry for data messages where the
1190 * destination node is known and the header is complete,
1191 * inclusive total message length.
1192 * Returns user data length.
1193 */
1194 int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode)
1195 {
1196 struct link *l_ptr;
1197 struct node *n_ptr;
1198 int res;
1199 u32 selector = msg_origport(buf_msg(buf)) & 1;
1200 u32 dummy;
1201
1202 if (destnode == tipc_own_addr)
1203 return tipc_port_recv_msg(buf);
1204
1205 read_lock_bh(&tipc_net_lock);
1206 n_ptr = tipc_node_select(destnode, selector);
1207 if (likely(n_ptr)) {
1208 tipc_node_lock(n_ptr);
1209 l_ptr = n_ptr->active_links[selector];
1210 dbg("send_fast: buf %x selected %x, destnode = %x\n",
1211 buf, l_ptr, destnode);
1212 if (likely(l_ptr)) {
1213 res = link_send_buf_fast(l_ptr, buf, &dummy);
1214 tipc_node_unlock(n_ptr);
1215 read_unlock_bh(&tipc_net_lock);
1216 return res;
1217 }
1218 tipc_node_unlock(n_ptr);
1219 }
1220 read_unlock_bh(&tipc_net_lock);
1221 res = msg_data_sz(buf_msg(buf));
1222 tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1223 return res;
1224 }
1225
1226
1227 /*
1228 * tipc_link_send_sections_fast: Entry for messages where the
1229 * destination processor is known and the header is complete,
1230 * except for total message length.
1231 * Returns user data length or errno.
1232 */
1233 int tipc_link_send_sections_fast(struct port *sender,
1234 struct iovec const *msg_sect,
1235 const u32 num_sect,
1236 u32 destaddr)
1237 {
1238 struct tipc_msg *hdr = &sender->publ.phdr;
1239 struct link *l_ptr;
1240 struct sk_buff *buf;
1241 struct node *node;
1242 int res;
1243 u32 selector = msg_origport(hdr) & 1;
1244
1245 assert(destaddr != tipc_own_addr);
1246
1247 again:
1248 /*
1249 * Try building message using port's max_pkt hint.
1250 * (Must not hold any locks while building message.)
1251 */
1252
1253 res = msg_build(hdr, msg_sect, num_sect, sender->max_pkt,
1254 !sender->user_port, &buf);
1255
1256 read_lock_bh(&tipc_net_lock);
1257 node = tipc_node_select(destaddr, selector);
1258 if (likely(node)) {
1259 tipc_node_lock(node);
1260 l_ptr = node->active_links[selector];
1261 if (likely(l_ptr)) {
1262 if (likely(buf)) {
1263 res = link_send_buf_fast(l_ptr, buf,
1264 &sender->max_pkt);
1265 if (unlikely(res < 0))
1266 buf_discard(buf);
1267 exit:
1268 tipc_node_unlock(node);
1269 read_unlock_bh(&tipc_net_lock);
1270 return res;
1271 }
1272
1273 /* Exit if build request was invalid */
1274
1275 if (unlikely(res < 0))
1276 goto exit;
1277
1278 /* Exit if link (or bearer) is congested */
1279
1280 if (link_congested(l_ptr) ||
1281 !list_empty(&l_ptr->b_ptr->cong_links)) {
1282 res = link_schedule_port(l_ptr,
1283 sender->publ.ref, res);
1284 goto exit;
1285 }
1286
1287 /*
1288 * Message size exceeds max_pkt hint; update hint,
1289 * then re-try fast path or fragment the message
1290 */
1291
1292 sender->max_pkt = link_max_pkt(l_ptr);
1293 tipc_node_unlock(node);
1294 read_unlock_bh(&tipc_net_lock);
1295
1296
1297 if ((msg_hdr_sz(hdr) + res) <= sender->max_pkt)
1298 goto again;
1299
1300 return link_send_sections_long(sender, msg_sect,
1301 num_sect, destaddr);
1302 }
1303 tipc_node_unlock(node);
1304 }
1305 read_unlock_bh(&tipc_net_lock);
1306
1307 /* Couldn't find a link to the destination node */
1308
1309 if (buf)
1310 return tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1311 if (res >= 0)
1312 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
1313 TIPC_ERR_NO_NODE);
1314 return res;
1315 }
1316
1317 /*
1318 * link_send_sections_long(): Entry for long messages where the
1319 * destination node is known and the header is complete,
1320 * inclusive total message length.
1321 * Link and bearer congestion status have been checked to be ok,
1322 * and are ignored if they change.
1323 *
1324 * Note that fragments do not use the full link MTU so that they won't have
1325 * to undergo refragmentation if link changeover causes them to be sent
1326 * over another link with an additional tunnel header added as prefix.
1327 * (Refragmentation will still occur if the other link has a smaller MTU.)
1328 *
1329 * Returns user data length or errno.
1330 */
1331 static int link_send_sections_long(struct port *sender,
1332 struct iovec const *msg_sect,
1333 u32 num_sect,
1334 u32 destaddr)
1335 {
1336 struct link *l_ptr;
1337 struct node *node;
1338 struct tipc_msg *hdr = &sender->publ.phdr;
1339 u32 dsz = msg_data_sz(hdr);
1340 u32 max_pkt,fragm_sz,rest;
1341 struct tipc_msg fragm_hdr;
1342 struct sk_buff *buf,*buf_chain,*prev;
1343 u32 fragm_crs,fragm_rest,hsz,sect_rest;
1344 const unchar *sect_crs;
1345 int curr_sect;
1346 u32 fragm_no;
1347
1348 again:
1349 fragm_no = 1;
1350 max_pkt = sender->max_pkt - INT_H_SIZE;
1351 /* leave room for tunnel header in case of link changeover */
1352 fragm_sz = max_pkt - INT_H_SIZE;
1353 /* leave room for fragmentation header in each fragment */
1354 rest = dsz;
1355 fragm_crs = 0;
1356 fragm_rest = 0;
1357 sect_rest = 0;
1358 sect_crs = NULL;
1359 curr_sect = -1;
1360
1361 /* Prepare reusable fragment header: */
1362
1363 msg_dbg(hdr, ">FRAGMENTING>");
1364 msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
1365 TIPC_OK, INT_H_SIZE, msg_destnode(hdr));
1366 msg_set_link_selector(&fragm_hdr, sender->publ.ref);
1367 msg_set_size(&fragm_hdr, max_pkt);
1368 msg_set_fragm_no(&fragm_hdr, 1);
1369
1370 /* Prepare header of first fragment: */
1371
1372 buf_chain = buf = buf_acquire(max_pkt);
1373 if (!buf)
1374 return -ENOMEM;
1375 buf->next = NULL;
1376 memcpy(buf->data, (unchar *)&fragm_hdr, INT_H_SIZE);
1377 hsz = msg_hdr_sz(hdr);
1378 memcpy(buf->data + INT_H_SIZE, (unchar *)hdr, hsz);
1379 msg_dbg(buf_msg(buf), ">BUILD>");
1380
1381 /* Chop up message: */
1382
1383 fragm_crs = INT_H_SIZE + hsz;
1384 fragm_rest = fragm_sz - hsz;
1385
1386 do { /* For all sections */
1387 u32 sz;
1388
1389 if (!sect_rest) {
1390 sect_rest = msg_sect[++curr_sect].iov_len;
1391 sect_crs = (const unchar *)msg_sect[curr_sect].iov_base;
1392 }
1393
1394 if (sect_rest < fragm_rest)
1395 sz = sect_rest;
1396 else
1397 sz = fragm_rest;
1398
1399 if (likely(!sender->user_port)) {
1400 if (copy_from_user(buf->data + fragm_crs, sect_crs, sz)) {
1401 error:
1402 for (; buf_chain; buf_chain = buf) {
1403 buf = buf_chain->next;
1404 buf_discard(buf_chain);
1405 }
1406 return -EFAULT;
1407 }
1408 } else
1409 memcpy(buf->data + fragm_crs, sect_crs, sz);
1410
1411 sect_crs += sz;
1412 sect_rest -= sz;
1413 fragm_crs += sz;
1414 fragm_rest -= sz;
1415 rest -= sz;
1416
1417 if (!fragm_rest && rest) {
1418
1419 /* Initiate new fragment: */
1420 if (rest <= fragm_sz) {
1421 fragm_sz = rest;
1422 msg_set_type(&fragm_hdr,LAST_FRAGMENT);
1423 } else {
1424 msg_set_type(&fragm_hdr, FRAGMENT);
1425 }
1426 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
1427 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
1428 prev = buf;
1429 buf = buf_acquire(fragm_sz + INT_H_SIZE);
1430 if (!buf)
1431 goto error;
1432
1433 buf->next = NULL;
1434 prev->next = buf;
1435 memcpy(buf->data, (unchar *)&fragm_hdr, INT_H_SIZE);
1436 fragm_crs = INT_H_SIZE;
1437 fragm_rest = fragm_sz;
1438 msg_dbg(buf_msg(buf)," >BUILD>");
1439 }
1440 }
1441 while (rest > 0);
1442
1443 /*
1444 * Now we have a buffer chain. Select a link and check
1445 * that packet size is still OK
1446 */
1447 node = tipc_node_select(destaddr, sender->publ.ref & 1);
1448 if (likely(node)) {
1449 tipc_node_lock(node);
1450 l_ptr = node->active_links[sender->publ.ref & 1];
1451 if (!l_ptr) {
1452 tipc_node_unlock(node);
1453 goto reject;
1454 }
1455 if (link_max_pkt(l_ptr) < max_pkt) {
1456 sender->max_pkt = link_max_pkt(l_ptr);
1457 tipc_node_unlock(node);
1458 for (; buf_chain; buf_chain = buf) {
1459 buf = buf_chain->next;
1460 buf_discard(buf_chain);
1461 }
1462 goto again;
1463 }
1464 } else {
1465 reject:
1466 for (; buf_chain; buf_chain = buf) {
1467 buf = buf_chain->next;
1468 buf_discard(buf_chain);
1469 }
1470 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
1471 TIPC_ERR_NO_NODE);
1472 }
1473
1474 /* Append whole chain to send queue: */
1475
1476 buf = buf_chain;
1477 l_ptr->long_msg_seq_no = mod(l_ptr->long_msg_seq_no + 1);
1478 if (!l_ptr->next_out)
1479 l_ptr->next_out = buf_chain;
1480 l_ptr->stats.sent_fragmented++;
1481 while (buf) {
1482 struct sk_buff *next = buf->next;
1483 struct tipc_msg *msg = buf_msg(buf);
1484
1485 l_ptr->stats.sent_fragments++;
1486 msg_set_long_msgno(msg, l_ptr->long_msg_seq_no);
1487 link_add_to_outqueue(l_ptr, buf, msg);
1488 msg_dbg(msg, ">ADD>");
1489 buf = next;
1490 }
1491
1492 /* Send it, if possible: */
1493
1494 tipc_link_push_queue(l_ptr);
1495 tipc_node_unlock(node);
1496 return dsz;
1497 }
1498
1499 /*
1500 * tipc_link_push_packet: Push one unsent packet to the media
1501 */
1502 u32 tipc_link_push_packet(struct link *l_ptr)
1503 {
1504 struct sk_buff *buf = l_ptr->first_out;
1505 u32 r_q_size = l_ptr->retransm_queue_size;
1506 u32 r_q_head = l_ptr->retransm_queue_head;
1507
1508 /* Step to position where retransmission failed, if any, */
1509 /* consider that buffers may have been released in meantime */
1510
1511 if (r_q_size && buf) {
1512 u32 last = lesser(mod(r_q_head + r_q_size),
1513 link_last_sent(l_ptr));
1514 u32 first = msg_seqno(buf_msg(buf));
1515
1516 while (buf && less(first, r_q_head)) {
1517 first = mod(first + 1);
1518 buf = buf->next;
1519 }
1520 l_ptr->retransm_queue_head = r_q_head = first;
1521 l_ptr->retransm_queue_size = r_q_size = mod(last - first);
1522 }
1523
1524 /* Continue retransmission now, if there is anything: */
1525
1526 if (r_q_size && buf && !skb_cloned(buf)) {
1527 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
1528 msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
1529 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1530 msg_dbg(buf_msg(buf), ">DEF-RETR>");
1531 l_ptr->retransm_queue_head = mod(++r_q_head);
1532 l_ptr->retransm_queue_size = --r_q_size;
1533 l_ptr->stats.retransmitted++;
1534 return TIPC_OK;
1535 } else {
1536 l_ptr->stats.bearer_congs++;
1537 msg_dbg(buf_msg(buf), "|>DEF-RETR>");
1538 return PUSH_FAILED;
1539 }
1540 }
1541
1542 /* Send deferred protocol message, if any: */
1543
1544 buf = l_ptr->proto_msg_queue;
1545 if (buf) {
1546 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
1547 msg_set_bcast_ack(buf_msg(buf),l_ptr->owner->bclink.last_in);
1548 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1549 msg_dbg(buf_msg(buf), ">DEF-PROT>");
1550 l_ptr->unacked_window = 0;
1551 buf_discard(buf);
1552 l_ptr->proto_msg_queue = NULL;
1553 return TIPC_OK;
1554 } else {
1555 msg_dbg(buf_msg(buf), "|>DEF-PROT>");
1556 l_ptr->stats.bearer_congs++;
1557 return PUSH_FAILED;
1558 }
1559 }
1560
1561 /* Send one deferred data message, if send window not full: */
1562
1563 buf = l_ptr->next_out;
1564 if (buf) {
1565 struct tipc_msg *msg = buf_msg(buf);
1566 u32 next = msg_seqno(msg);
1567 u32 first = msg_seqno(buf_msg(l_ptr->first_out));
1568
1569 if (mod(next - first) < l_ptr->queue_limit[0]) {
1570 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1571 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1572 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1573 if (msg_user(msg) == MSG_BUNDLER)
1574 msg_set_type(msg, CLOSED_MSG);
1575 msg_dbg(msg, ">PUSH-DATA>");
1576 l_ptr->next_out = buf->next;
1577 return TIPC_OK;
1578 } else {
1579 msg_dbg(msg, "|PUSH-DATA|");
1580 l_ptr->stats.bearer_congs++;
1581 return PUSH_FAILED;
1582 }
1583 }
1584 }
1585 return PUSH_FINISHED;
1586 }
1587
1588 /*
1589 * push_queue(): push out the unsent messages of a link where
1590 * congestion has abated. Node is locked
1591 */
1592 void tipc_link_push_queue(struct link *l_ptr)
1593 {
1594 u32 res;
1595
1596 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr))
1597 return;
1598
1599 do {
1600 res = tipc_link_push_packet(l_ptr);
1601 }
1602 while (res == TIPC_OK);
1603 if (res == PUSH_FAILED)
1604 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
1605 }
1606
1607 void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *buf,
1608 u32 retransmits)
1609 {
1610 struct tipc_msg *msg;
1611
1612 dbg("Retransmitting %u in link %x\n", retransmits, l_ptr);
1613
1614 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr) && buf && !skb_cloned(buf)) {
1615 msg_dbg(buf_msg(buf), ">NO_RETR->BCONG>");
1616 dbg_print_link(l_ptr, " ");
1617 l_ptr->retransm_queue_head = msg_seqno(buf_msg(buf));
1618 l_ptr->retransm_queue_size = retransmits;
1619 return;
1620 }
1621 while (retransmits && (buf != l_ptr->next_out) && buf && !skb_cloned(buf)) {
1622 msg = buf_msg(buf);
1623 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1624 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1625 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1626 /* Catch if retransmissions fail repeatedly: */
1627 if (l_ptr->last_retransmitted == msg_seqno(msg)) {
1628 if (++l_ptr->stale_count > 100) {
1629 tipc_msg_print(TIPC_CONS, buf_msg(buf), ">RETR>");
1630 info("...Retransmitted %u times\n",
1631 l_ptr->stale_count);
1632 link_print(l_ptr, TIPC_CONS, "Resetting Link\n");
1633 tipc_link_reset(l_ptr);
1634 break;
1635 }
1636 } else {
1637 l_ptr->stale_count = 0;
1638 }
1639 l_ptr->last_retransmitted = msg_seqno(msg);
1640
1641 msg_dbg(buf_msg(buf), ">RETR>");
1642 buf = buf->next;
1643 retransmits--;
1644 l_ptr->stats.retransmitted++;
1645 } else {
1646 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
1647 l_ptr->stats.bearer_congs++;
1648 l_ptr->retransm_queue_head = msg_seqno(buf_msg(buf));
1649 l_ptr->retransm_queue_size = retransmits;
1650 return;
1651 }
1652 }
1653 l_ptr->retransm_queue_head = l_ptr->retransm_queue_size = 0;
1654 }
1655
1656 /*
1657 * link_recv_non_seq: Receive packets which are outside
1658 * the link sequence flow
1659 */
1660
1661 static void link_recv_non_seq(struct sk_buff *buf)
1662 {
1663 struct tipc_msg *msg = buf_msg(buf);
1664
1665 if (msg_user(msg) == LINK_CONFIG)
1666 tipc_disc_recv_msg(buf);
1667 else
1668 tipc_bclink_recv_pkt(buf);
1669 }
1670
1671 /**
1672 * link_insert_deferred_queue - insert deferred messages back into receive chain
1673 */
1674
1675 static struct sk_buff *link_insert_deferred_queue(struct link *l_ptr,
1676 struct sk_buff *buf)
1677 {
1678 u32 seq_no;
1679
1680 if (l_ptr->oldest_deferred_in == NULL)
1681 return buf;
1682
1683 seq_no = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
1684 if (seq_no == mod(l_ptr->next_in_no)) {
1685 l_ptr->newest_deferred_in->next = buf;
1686 buf = l_ptr->oldest_deferred_in;
1687 l_ptr->oldest_deferred_in = NULL;
1688 l_ptr->deferred_inqueue_sz = 0;
1689 }
1690 return buf;
1691 }
1692
1693 void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *tb_ptr)
1694 {
1695 read_lock_bh(&tipc_net_lock);
1696 while (head) {
1697 struct bearer *b_ptr;
1698 struct node *n_ptr;
1699 struct link *l_ptr;
1700 struct sk_buff *crs;
1701 struct sk_buff *buf = head;
1702 struct tipc_msg *msg = buf_msg(buf);
1703 u32 seq_no = msg_seqno(msg);
1704 u32 ackd = msg_ack(msg);
1705 u32 released = 0;
1706 int type;
1707
1708 b_ptr = (struct bearer *)tb_ptr;
1709 TIPC_SKB_CB(buf)->handle = b_ptr;
1710
1711 head = head->next;
1712 if (unlikely(msg_version(msg) != TIPC_VERSION))
1713 goto cont;
1714 #if 0
1715 if (msg_user(msg) != LINK_PROTOCOL)
1716 #endif
1717 msg_dbg(msg,"<REC<");
1718
1719 if (unlikely(msg_non_seq(msg))) {
1720 link_recv_non_seq(buf);
1721 continue;
1722 }
1723 n_ptr = tipc_node_find(msg_prevnode(msg));
1724 if (unlikely(!n_ptr))
1725 goto cont;
1726
1727 tipc_node_lock(n_ptr);
1728 l_ptr = n_ptr->links[b_ptr->identity];
1729 if (unlikely(!l_ptr)) {
1730 tipc_node_unlock(n_ptr);
1731 goto cont;
1732 }
1733 /*
1734 * Release acked messages
1735 */
1736 if (less(n_ptr->bclink.acked, msg_bcast_ack(msg))) {
1737 if (tipc_node_is_up(n_ptr) && n_ptr->bclink.supported)
1738 tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
1739 }
1740
1741 crs = l_ptr->first_out;
1742 while ((crs != l_ptr->next_out) &&
1743 less_eq(msg_seqno(buf_msg(crs)), ackd)) {
1744 struct sk_buff *next = crs->next;
1745
1746 buf_discard(crs);
1747 crs = next;
1748 released++;
1749 }
1750 if (released) {
1751 l_ptr->first_out = crs;
1752 l_ptr->out_queue_size -= released;
1753 }
1754 if (unlikely(l_ptr->next_out))
1755 tipc_link_push_queue(l_ptr);
1756 if (unlikely(!list_empty(&l_ptr->waiting_ports)))
1757 tipc_link_wakeup_ports(l_ptr, 0);
1758 if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
1759 l_ptr->stats.sent_acks++;
1760 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
1761 }
1762
1763 protocol_check:
1764 if (likely(link_working_working(l_ptr))) {
1765 if (likely(seq_no == mod(l_ptr->next_in_no))) {
1766 l_ptr->next_in_no++;
1767 if (unlikely(l_ptr->oldest_deferred_in))
1768 head = link_insert_deferred_queue(l_ptr,
1769 head);
1770 if (likely(msg_is_dest(msg, tipc_own_addr))) {
1771 deliver:
1772 if (likely(msg_isdata(msg))) {
1773 tipc_node_unlock(n_ptr);
1774 tipc_port_recv_msg(buf);
1775 continue;
1776 }
1777 switch (msg_user(msg)) {
1778 case MSG_BUNDLER:
1779 l_ptr->stats.recv_bundles++;
1780 l_ptr->stats.recv_bundled +=
1781 msg_msgcnt(msg);
1782 tipc_node_unlock(n_ptr);
1783 tipc_link_recv_bundle(buf);
1784 continue;
1785 case ROUTE_DISTRIBUTOR:
1786 tipc_node_unlock(n_ptr);
1787 tipc_cltr_recv_routing_table(buf);
1788 continue;
1789 case NAME_DISTRIBUTOR:
1790 tipc_node_unlock(n_ptr);
1791 tipc_named_recv(buf);
1792 continue;
1793 case CONN_MANAGER:
1794 tipc_node_unlock(n_ptr);
1795 tipc_port_recv_proto_msg(buf);
1796 continue;
1797 case MSG_FRAGMENTER:
1798 l_ptr->stats.recv_fragments++;
1799 if (tipc_link_recv_fragment(&l_ptr->defragm_buf,
1800 &buf, &msg)) {
1801 l_ptr->stats.recv_fragmented++;
1802 goto deliver;
1803 }
1804 break;
1805 case CHANGEOVER_PROTOCOL:
1806 type = msg_type(msg);
1807 if (link_recv_changeover_msg(&l_ptr, &buf)) {
1808 msg = buf_msg(buf);
1809 seq_no = msg_seqno(msg);
1810 TIPC_SKB_CB(buf)->handle
1811 = b_ptr;
1812 if (type == ORIGINAL_MSG)
1813 goto deliver;
1814 goto protocol_check;
1815 }
1816 break;
1817 }
1818 }
1819 tipc_node_unlock(n_ptr);
1820 tipc_net_route_msg(buf);
1821 continue;
1822 }
1823 link_handle_out_of_seq_msg(l_ptr, buf);
1824 head = link_insert_deferred_queue(l_ptr, head);
1825 tipc_node_unlock(n_ptr);
1826 continue;
1827 }
1828
1829 if (msg_user(msg) == LINK_PROTOCOL) {
1830 link_recv_proto_msg(l_ptr, buf);
1831 head = link_insert_deferred_queue(l_ptr, head);
1832 tipc_node_unlock(n_ptr);
1833 continue;
1834 }
1835 msg_dbg(msg,"NSEQ<REC<");
1836 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
1837
1838 if (link_working_working(l_ptr)) {
1839 /* Re-insert in front of queue */
1840 msg_dbg(msg,"RECV-REINS:");
1841 buf->next = head;
1842 head = buf;
1843 tipc_node_unlock(n_ptr);
1844 continue;
1845 }
1846 tipc_node_unlock(n_ptr);
1847 cont:
1848 buf_discard(buf);
1849 }
1850 read_unlock_bh(&tipc_net_lock);
1851 }
1852
1853 /*
1854 * link_defer_buf(): Sort a received out-of-sequence packet
1855 * into the deferred reception queue.
1856 * Returns the increase of the queue length,i.e. 0 or 1
1857 */
1858
1859 u32 tipc_link_defer_pkt(struct sk_buff **head,
1860 struct sk_buff **tail,
1861 struct sk_buff *buf)
1862 {
1863 struct sk_buff *prev = NULL;
1864 struct sk_buff *crs = *head;
1865 u32 seq_no = msg_seqno(buf_msg(buf));
1866
1867 buf->next = NULL;
1868
1869 /* Empty queue ? */
1870 if (*head == NULL) {
1871 *head = *tail = buf;
1872 return 1;
1873 }
1874
1875 /* Last ? */
1876 if (less(msg_seqno(buf_msg(*tail)), seq_no)) {
1877 (*tail)->next = buf;
1878 *tail = buf;
1879 return 1;
1880 }
1881
1882 /* Scan through queue and sort it in */
1883 do {
1884 struct tipc_msg *msg = buf_msg(crs);
1885
1886 if (less(seq_no, msg_seqno(msg))) {
1887 buf->next = crs;
1888 if (prev)
1889 prev->next = buf;
1890 else
1891 *head = buf;
1892 return 1;
1893 }
1894 if (seq_no == msg_seqno(msg)) {
1895 break;
1896 }
1897 prev = crs;
1898 crs = crs->next;
1899 }
1900 while (crs);
1901
1902 /* Message is a duplicate of an existing message */
1903
1904 buf_discard(buf);
1905 return 0;
1906 }
1907
1908 /**
1909 * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
1910 */
1911
1912 static void link_handle_out_of_seq_msg(struct link *l_ptr,
1913 struct sk_buff *buf)
1914 {
1915 u32 seq_no = msg_seqno(buf_msg(buf));
1916
1917 if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
1918 link_recv_proto_msg(l_ptr, buf);
1919 return;
1920 }
1921
1922 dbg("rx OOS msg: seq_no %u, expecting %u (%u)\n",
1923 seq_no, mod(l_ptr->next_in_no), l_ptr->next_in_no);
1924
1925 /* Record OOS packet arrival (force mismatch on next timeout) */
1926
1927 l_ptr->checkpoint--;
1928
1929 /*
1930 * Discard packet if a duplicate; otherwise add it to deferred queue
1931 * and notify peer of gap as per protocol specification
1932 */
1933
1934 if (less(seq_no, mod(l_ptr->next_in_no))) {
1935 l_ptr->stats.duplicates++;
1936 buf_discard(buf);
1937 return;
1938 }
1939
1940 if (tipc_link_defer_pkt(&l_ptr->oldest_deferred_in,
1941 &l_ptr->newest_deferred_in, buf)) {
1942 l_ptr->deferred_inqueue_sz++;
1943 l_ptr->stats.deferred_recv++;
1944 if ((l_ptr->deferred_inqueue_sz % 16) == 1)
1945 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
1946 } else
1947 l_ptr->stats.duplicates++;
1948 }
1949
1950 /*
1951 * Send protocol message to the other endpoint.
1952 */
1953 void tipc_link_send_proto_msg(struct link *l_ptr, u32 msg_typ, int probe_msg,
1954 u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
1955 {
1956 struct sk_buff *buf = NULL;
1957 struct tipc_msg *msg = l_ptr->pmsg;
1958 u32 msg_size = sizeof(l_ptr->proto_msg);
1959
1960 if (link_blocked(l_ptr))
1961 return;
1962 msg_set_type(msg, msg_typ);
1963 msg_set_net_plane(msg, l_ptr->b_ptr->net_plane);
1964 msg_set_bcast_ack(msg, mod(l_ptr->owner->bclink.last_in));
1965 msg_set_last_bcast(msg, tipc_bclink_get_last_sent());
1966
1967 if (msg_typ == STATE_MSG) {
1968 u32 next_sent = mod(l_ptr->next_out_no);
1969
1970 if (!tipc_link_is_up(l_ptr))
1971 return;
1972 if (l_ptr->next_out)
1973 next_sent = msg_seqno(buf_msg(l_ptr->next_out));
1974 msg_set_next_sent(msg, next_sent);
1975 if (l_ptr->oldest_deferred_in) {
1976 u32 rec = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
1977 gap = mod(rec - mod(l_ptr->next_in_no));
1978 }
1979 msg_set_seq_gap(msg, gap);
1980 if (gap)
1981 l_ptr->stats.sent_nacks++;
1982 msg_set_link_tolerance(msg, tolerance);
1983 msg_set_linkprio(msg, priority);
1984 msg_set_max_pkt(msg, ack_mtu);
1985 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1986 msg_set_probe(msg, probe_msg != 0);
1987 if (probe_msg) {
1988 u32 mtu = l_ptr->max_pkt;
1989
1990 if ((mtu < l_ptr->max_pkt_target) &&
1991 link_working_working(l_ptr) &&
1992 l_ptr->fsm_msg_cnt) {
1993 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
1994 if (l_ptr->max_pkt_probes == 10) {
1995 l_ptr->max_pkt_target = (msg_size - 4);
1996 l_ptr->max_pkt_probes = 0;
1997 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
1998 }
1999 l_ptr->max_pkt_probes++;
2000 }
2001
2002 l_ptr->stats.sent_probes++;
2003 }
2004 l_ptr->stats.sent_states++;
2005 } else { /* RESET_MSG or ACTIVATE_MSG */
2006 msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1));
2007 msg_set_seq_gap(msg, 0);
2008 msg_set_next_sent(msg, 1);
2009 msg_set_link_tolerance(msg, l_ptr->tolerance);
2010 msg_set_linkprio(msg, l_ptr->priority);
2011 msg_set_max_pkt(msg, l_ptr->max_pkt_target);
2012 }
2013
2014 if (tipc_node_has_redundant_links(l_ptr->owner)) {
2015 msg_set_redundant_link(msg);
2016 } else {
2017 msg_clear_redundant_link(msg);
2018 }
2019 msg_set_linkprio(msg, l_ptr->priority);
2020
2021 /* Ensure sequence number will not fit : */
2022
2023 msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
2024
2025 /* Congestion? */
2026
2027 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
2028 if (!l_ptr->proto_msg_queue) {
2029 l_ptr->proto_msg_queue =
2030 buf_acquire(sizeof(l_ptr->proto_msg));
2031 }
2032 buf = l_ptr->proto_msg_queue;
2033 if (!buf)
2034 return;
2035 memcpy(buf->data, (unchar *)msg, sizeof(l_ptr->proto_msg));
2036 return;
2037 }
2038 msg_set_timestamp(msg, jiffies_to_msecs(jiffies));
2039
2040 /* Message can be sent */
2041
2042 msg_dbg(msg, ">>");
2043
2044 buf = buf_acquire(msg_size);
2045 if (!buf)
2046 return;
2047
2048 memcpy(buf->data, (unchar *)msg, sizeof(l_ptr->proto_msg));
2049 msg_set_size(buf_msg(buf), msg_size);
2050
2051 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
2052 l_ptr->unacked_window = 0;
2053 buf_discard(buf);
2054 return;
2055 }
2056
2057 /* New congestion */
2058 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
2059 l_ptr->proto_msg_queue = buf;
2060 l_ptr->stats.bearer_congs++;
2061 }
2062
2063 /*
2064 * Receive protocol message :
2065 * Note that network plane id propagates through the network, and may
2066 * change at any time. The node with lowest address rules
2067 */
2068
2069 static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf)
2070 {
2071 u32 rec_gap = 0;
2072 u32 max_pkt_info;
2073 u32 max_pkt_ack;
2074 u32 msg_tol;
2075 struct tipc_msg *msg = buf_msg(buf);
2076
2077 dbg("AT(%u):", jiffies_to_msecs(jiffies));
2078 msg_dbg(msg, "<<");
2079 if (link_blocked(l_ptr))
2080 goto exit;
2081
2082 /* record unnumbered packet arrival (force mismatch on next timeout) */
2083
2084 l_ptr->checkpoint--;
2085
2086 if (l_ptr->b_ptr->net_plane != msg_net_plane(msg))
2087 if (tipc_own_addr > msg_prevnode(msg))
2088 l_ptr->b_ptr->net_plane = msg_net_plane(msg);
2089
2090 l_ptr->owner->permit_changeover = msg_redundant_link(msg);
2091
2092 switch (msg_type(msg)) {
2093
2094 case RESET_MSG:
2095 if (!link_working_unknown(l_ptr) && l_ptr->peer_session) {
2096 if (msg_session(msg) == l_ptr->peer_session) {
2097 dbg("Duplicate RESET: %u<->%u\n",
2098 msg_session(msg), l_ptr->peer_session);
2099 break; /* duplicate: ignore */
2100 }
2101 }
2102 /* fall thru' */
2103 case ACTIVATE_MSG:
2104 /* Update link settings according other endpoint's values */
2105
2106 strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
2107
2108 if ((msg_tol = msg_link_tolerance(msg)) &&
2109 (msg_tol > l_ptr->tolerance))
2110 link_set_supervision_props(l_ptr, msg_tol);
2111
2112 if (msg_linkprio(msg) > l_ptr->priority)
2113 l_ptr->priority = msg_linkprio(msg);
2114
2115 max_pkt_info = msg_max_pkt(msg);
2116 if (max_pkt_info) {
2117 if (max_pkt_info < l_ptr->max_pkt_target)
2118 l_ptr->max_pkt_target = max_pkt_info;
2119 if (l_ptr->max_pkt > l_ptr->max_pkt_target)
2120 l_ptr->max_pkt = l_ptr->max_pkt_target;
2121 } else {
2122 l_ptr->max_pkt = l_ptr->max_pkt_target;
2123 }
2124 l_ptr->owner->bclink.supported = (max_pkt_info != 0);
2125
2126 link_state_event(l_ptr, msg_type(msg));
2127
2128 l_ptr->peer_session = msg_session(msg);
2129 l_ptr->peer_bearer_id = msg_bearer_id(msg);
2130
2131 /* Synchronize broadcast sequence numbers */
2132 if (!tipc_node_has_redundant_links(l_ptr->owner)) {
2133 l_ptr->owner->bclink.last_in = mod(msg_last_bcast(msg));
2134 }
2135 break;
2136 case STATE_MSG:
2137
2138 if ((msg_tol = msg_link_tolerance(msg)))
2139 link_set_supervision_props(l_ptr, msg_tol);
2140
2141 if (msg_linkprio(msg) &&
2142 (msg_linkprio(msg) != l_ptr->priority)) {
2143 warn("Changing prio <%s>: %u->%u\n",
2144 l_ptr->name, l_ptr->priority, msg_linkprio(msg));
2145 l_ptr->priority = msg_linkprio(msg);
2146 tipc_link_reset(l_ptr); /* Enforce change to take effect */
2147 break;
2148 }
2149 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
2150 l_ptr->stats.recv_states++;
2151 if (link_reset_unknown(l_ptr))
2152 break;
2153
2154 if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
2155 rec_gap = mod(msg_next_sent(msg) -
2156 mod(l_ptr->next_in_no));
2157 }
2158
2159 max_pkt_ack = msg_max_pkt(msg);
2160 if (max_pkt_ack > l_ptr->max_pkt) {
2161 dbg("Link <%s> updated MTU %u -> %u\n",
2162 l_ptr->name, l_ptr->max_pkt, max_pkt_ack);
2163 l_ptr->max_pkt = max_pkt_ack;
2164 l_ptr->max_pkt_probes = 0;
2165 }
2166
2167 max_pkt_ack = 0;
2168 if (msg_probe(msg)) {
2169 l_ptr->stats.recv_probes++;
2170 if (msg_size(msg) > sizeof(l_ptr->proto_msg)) {
2171 max_pkt_ack = msg_size(msg);
2172 }
2173 }
2174
2175 /* Protocol message before retransmits, reduce loss risk */
2176
2177 tipc_bclink_check_gap(l_ptr->owner, msg_last_bcast(msg));
2178
2179 if (rec_gap || (msg_probe(msg))) {
2180 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2181 0, rec_gap, 0, 0, max_pkt_ack);
2182 }
2183 if (msg_seq_gap(msg)) {
2184 msg_dbg(msg, "With Gap:");
2185 l_ptr->stats.recv_nacks++;
2186 tipc_link_retransmit(l_ptr, l_ptr->first_out,
2187 msg_seq_gap(msg));
2188 }
2189 break;
2190 default:
2191 msg_dbg(buf_msg(buf), "<DISCARDING UNKNOWN<");
2192 }
2193 exit:
2194 buf_discard(buf);
2195 }
2196
2197
2198 /*
2199 * tipc_link_tunnel(): Send one message via a link belonging to
2200 * another bearer. Owner node is locked.
2201 */
2202 void tipc_link_tunnel(struct link *l_ptr,
2203 struct tipc_msg *tunnel_hdr,
2204 struct tipc_msg *msg,
2205 u32 selector)
2206 {
2207 struct link *tunnel;
2208 struct sk_buff *buf;
2209 u32 length = msg_size(msg);
2210
2211 tunnel = l_ptr->owner->active_links[selector & 1];
2212 if (!tipc_link_is_up(tunnel))
2213 return;
2214 msg_set_size(tunnel_hdr, length + INT_H_SIZE);
2215 buf = buf_acquire(length + INT_H_SIZE);
2216 if (!buf)
2217 return;
2218 memcpy(buf->data, (unchar *)tunnel_hdr, INT_H_SIZE);
2219 memcpy(buf->data + INT_H_SIZE, (unchar *)msg, length);
2220 dbg("%c->%c:", l_ptr->b_ptr->net_plane, tunnel->b_ptr->net_plane);
2221 msg_dbg(buf_msg(buf), ">SEND>");
2222 assert(tunnel);
2223 tipc_link_send_buf(tunnel, buf);
2224 }
2225
2226
2227
2228 /*
2229 * changeover(): Send whole message queue via the remaining link
2230 * Owner node is locked.
2231 */
2232
2233 void tipc_link_changeover(struct link *l_ptr)
2234 {
2235 u32 msgcount = l_ptr->out_queue_size;
2236 struct sk_buff *crs = l_ptr->first_out;
2237 struct link *tunnel = l_ptr->owner->active_links[0];
2238 int split_bundles = tipc_node_has_redundant_links(l_ptr->owner);
2239 struct tipc_msg tunnel_hdr;
2240
2241 if (!tunnel)
2242 return;
2243
2244 if (!l_ptr->owner->permit_changeover)
2245 return;
2246
2247 msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
2248 ORIGINAL_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
2249 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2250 msg_set_msgcnt(&tunnel_hdr, msgcount);
2251 if (!l_ptr->first_out) {
2252 struct sk_buff *buf;
2253
2254 assert(!msgcount);
2255 buf = buf_acquire(INT_H_SIZE);
2256 if (buf) {
2257 memcpy(buf->data, (unchar *)&tunnel_hdr, INT_H_SIZE);
2258 msg_set_size(&tunnel_hdr, INT_H_SIZE);
2259 dbg("%c->%c:", l_ptr->b_ptr->net_plane,
2260 tunnel->b_ptr->net_plane);
2261 msg_dbg(&tunnel_hdr, "EMPTY>SEND>");
2262 tipc_link_send_buf(tunnel, buf);
2263 } else {
2264 warn("Memory squeeze; link changeover failed\n");
2265 }
2266 return;
2267 }
2268 while (crs) {
2269 struct tipc_msg *msg = buf_msg(crs);
2270
2271 if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
2272 u32 msgcount = msg_msgcnt(msg);
2273 struct tipc_msg *m = msg_get_wrapped(msg);
2274 unchar* pos = (unchar*)m;
2275
2276 while (msgcount--) {
2277 msg_set_seqno(m,msg_seqno(msg));
2278 tipc_link_tunnel(l_ptr, &tunnel_hdr, m,
2279 msg_link_selector(m));
2280 pos += align(msg_size(m));
2281 m = (struct tipc_msg *)pos;
2282 }
2283 } else {
2284 tipc_link_tunnel(l_ptr, &tunnel_hdr, msg,
2285 msg_link_selector(msg));
2286 }
2287 crs = crs->next;
2288 }
2289 }
2290
2291 void tipc_link_send_duplicate(struct link *l_ptr, struct link *tunnel)
2292 {
2293 struct sk_buff *iter;
2294 struct tipc_msg tunnel_hdr;
2295
2296 msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
2297 DUPLICATE_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
2298 msg_set_msgcnt(&tunnel_hdr, l_ptr->out_queue_size);
2299 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2300 iter = l_ptr->first_out;
2301 while (iter) {
2302 struct sk_buff *outbuf;
2303 struct tipc_msg *msg = buf_msg(iter);
2304 u32 length = msg_size(msg);
2305
2306 if (msg_user(msg) == MSG_BUNDLER)
2307 msg_set_type(msg, CLOSED_MSG);
2308 msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */
2309 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
2310 msg_set_size(&tunnel_hdr, length + INT_H_SIZE);
2311 outbuf = buf_acquire(length + INT_H_SIZE);
2312 if (outbuf == NULL) {
2313 warn("Memory squeeze; buffer duplication failed\n");
2314 return;
2315 }
2316 memcpy(outbuf->data, (unchar *)&tunnel_hdr, INT_H_SIZE);
2317 memcpy(outbuf->data + INT_H_SIZE, iter->data, length);
2318 dbg("%c->%c:", l_ptr->b_ptr->net_plane,
2319 tunnel->b_ptr->net_plane);
2320 msg_dbg(buf_msg(outbuf), ">SEND>");
2321 tipc_link_send_buf(tunnel, outbuf);
2322 if (!tipc_link_is_up(l_ptr))
2323 return;
2324 iter = iter->next;
2325 }
2326 }
2327
2328
2329
2330 /**
2331 * buf_extract - extracts embedded TIPC message from another message
2332 * @skb: encapsulating message buffer
2333 * @from_pos: offset to extract from
2334 *
2335 * Returns a new message buffer containing an embedded message. The
2336 * encapsulating message itself is left unchanged.
2337 */
2338
2339 static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos)
2340 {
2341 struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos);
2342 u32 size = msg_size(msg);
2343 struct sk_buff *eb;
2344
2345 eb = buf_acquire(size);
2346 if (eb)
2347 memcpy(eb->data, (unchar *)msg, size);
2348 return eb;
2349 }
2350
2351 /*
2352 * link_recv_changeover_msg(): Receive tunneled packet sent
2353 * via other link. Node is locked. Return extracted buffer.
2354 */
2355
2356 static int link_recv_changeover_msg(struct link **l_ptr,
2357 struct sk_buff **buf)
2358 {
2359 struct sk_buff *tunnel_buf = *buf;
2360 struct link *dest_link;
2361 struct tipc_msg *msg;
2362 struct tipc_msg *tunnel_msg = buf_msg(tunnel_buf);
2363 u32 msg_typ = msg_type(tunnel_msg);
2364 u32 msg_count = msg_msgcnt(tunnel_msg);
2365
2366 dest_link = (*l_ptr)->owner->links[msg_bearer_id(tunnel_msg)];
2367 assert(dest_link != *l_ptr);
2368 if (!dest_link) {
2369 msg_dbg(tunnel_msg, "NOLINK/<REC<");
2370 goto exit;
2371 }
2372 dbg("%c<-%c:", dest_link->b_ptr->net_plane,
2373 (*l_ptr)->b_ptr->net_plane);
2374 *l_ptr = dest_link;
2375 msg = msg_get_wrapped(tunnel_msg);
2376
2377 if (msg_typ == DUPLICATE_MSG) {
2378 if (less(msg_seqno(msg), mod(dest_link->next_in_no))) {
2379 msg_dbg(tunnel_msg, "DROP/<REC<");
2380 goto exit;
2381 }
2382 *buf = buf_extract(tunnel_buf,INT_H_SIZE);
2383 if (*buf == NULL) {
2384 warn("Memory squeeze; failed to extract msg\n");
2385 goto exit;
2386 }
2387 msg_dbg(tunnel_msg, "TNL<REC<");
2388 buf_discard(tunnel_buf);
2389 return 1;
2390 }
2391
2392 /* First original message ?: */
2393
2394 if (tipc_link_is_up(dest_link)) {
2395 msg_dbg(tunnel_msg, "UP/FIRST/<REC<");
2396 tipc_link_reset(dest_link);
2397 dest_link->exp_msg_count = msg_count;
2398 if (!msg_count)
2399 goto exit;
2400 } else if (dest_link->exp_msg_count == START_CHANGEOVER) {
2401 msg_dbg(tunnel_msg, "BLK/FIRST/<REC<");
2402 dest_link->exp_msg_count = msg_count;
2403 if (!msg_count)
2404 goto exit;
2405 }
2406
2407 /* Receive original message */
2408
2409 if (dest_link->exp_msg_count == 0) {
2410 msg_dbg(tunnel_msg, "OVERDUE/DROP/<REC<");
2411 dbg_print_link(dest_link, "LINK:");
2412 goto exit;
2413 }
2414 dest_link->exp_msg_count--;
2415 if (less(msg_seqno(msg), dest_link->reset_checkpoint)) {
2416 msg_dbg(tunnel_msg, "DROP/DUPL/<REC<");
2417 goto exit;
2418 } else {
2419 *buf = buf_extract(tunnel_buf, INT_H_SIZE);
2420 if (*buf != NULL) {
2421 msg_dbg(tunnel_msg, "TNL<REC<");
2422 buf_discard(tunnel_buf);
2423 return 1;
2424 } else {
2425 warn("Memory squeeze; dropped incoming msg\n");
2426 }
2427 }
2428 exit:
2429 *buf = NULL;
2430 buf_discard(tunnel_buf);
2431 return 0;
2432 }
2433
2434 /*
2435 * Bundler functionality:
2436 */
2437 void tipc_link_recv_bundle(struct sk_buff *buf)
2438 {
2439 u32 msgcount = msg_msgcnt(buf_msg(buf));
2440 u32 pos = INT_H_SIZE;
2441 struct sk_buff *obuf;
2442
2443 msg_dbg(buf_msg(buf), "<BNDL<: ");
2444 while (msgcount--) {
2445 obuf = buf_extract(buf, pos);
2446 if (obuf == NULL) {
2447 char addr_string[16];
2448
2449 warn("Buffer allocation failure;\n");
2450 warn(" incoming message(s) from %s lost\n",
2451 addr_string_fill(addr_string,
2452 msg_orignode(buf_msg(buf))));
2453 return;
2454 };
2455 pos += align(msg_size(buf_msg(obuf)));
2456 msg_dbg(buf_msg(obuf), " /");
2457 tipc_net_route_msg(obuf);
2458 }
2459 buf_discard(buf);
2460 }
2461
2462 /*
2463 * Fragmentation/defragmentation:
2464 */
2465
2466
2467 /*
2468 * tipc_link_send_long_buf: Entry for buffers needing fragmentation.
2469 * The buffer is complete, inclusive total message length.
2470 * Returns user data length.
2471 */
2472 int tipc_link_send_long_buf(struct link *l_ptr, struct sk_buff *buf)
2473 {
2474 struct tipc_msg *inmsg = buf_msg(buf);
2475 struct tipc_msg fragm_hdr;
2476 u32 insize = msg_size(inmsg);
2477 u32 dsz = msg_data_sz(inmsg);
2478 unchar *crs = buf->data;
2479 u32 rest = insize;
2480 u32 pack_sz = link_max_pkt(l_ptr);
2481 u32 fragm_sz = pack_sz - INT_H_SIZE;
2482 u32 fragm_no = 1;
2483 u32 destaddr = msg_destnode(inmsg);
2484
2485 if (msg_short(inmsg))
2486 destaddr = l_ptr->addr;
2487
2488 if (msg_routed(inmsg))
2489 msg_set_prevnode(inmsg, tipc_own_addr);
2490
2491 /* Prepare reusable fragment header: */
2492
2493 msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
2494 TIPC_OK, INT_H_SIZE, destaddr);
2495 msg_set_link_selector(&fragm_hdr, msg_link_selector(inmsg));
2496 msg_set_long_msgno(&fragm_hdr, mod(l_ptr->long_msg_seq_no++));
2497 msg_set_fragm_no(&fragm_hdr, fragm_no);
2498 l_ptr->stats.sent_fragmented++;
2499
2500 /* Chop up message: */
2501
2502 while (rest > 0) {
2503 struct sk_buff *fragm;
2504
2505 if (rest <= fragm_sz) {
2506 fragm_sz = rest;
2507 msg_set_type(&fragm_hdr, LAST_FRAGMENT);
2508 }
2509 fragm = buf_acquire(fragm_sz + INT_H_SIZE);
2510 if (fragm == NULL) {
2511 warn("Memory squeeze; failed to fragment msg\n");
2512 dsz = -ENOMEM;
2513 goto exit;
2514 }
2515 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
2516 memcpy(fragm->data, (unchar *)&fragm_hdr, INT_H_SIZE);
2517 memcpy(fragm->data + INT_H_SIZE, crs, fragm_sz);
2518
2519 /* Send queued messages first, if any: */
2520
2521 l_ptr->stats.sent_fragments++;
2522 tipc_link_send_buf(l_ptr, fragm);
2523 if (!tipc_link_is_up(l_ptr))
2524 return dsz;
2525 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
2526 rest -= fragm_sz;
2527 crs += fragm_sz;
2528 msg_set_type(&fragm_hdr, FRAGMENT);
2529 }
2530 exit:
2531 buf_discard(buf);
2532 return dsz;
2533 }
2534
2535 /*
2536 * A pending message being re-assembled must store certain values
2537 * to handle subsequent fragments correctly. The following functions
2538 * help storing these values in unused, available fields in the
2539 * pending message. This makes dynamic memory allocation unecessary.
2540 */
2541
2542 static void set_long_msg_seqno(struct sk_buff *buf, u32 seqno)
2543 {
2544 msg_set_seqno(buf_msg(buf), seqno);
2545 }
2546
2547 static u32 get_fragm_size(struct sk_buff *buf)
2548 {
2549 return msg_ack(buf_msg(buf));
2550 }
2551
2552 static void set_fragm_size(struct sk_buff *buf, u32 sz)
2553 {
2554 msg_set_ack(buf_msg(buf), sz);
2555 }
2556
2557 static u32 get_expected_frags(struct sk_buff *buf)
2558 {
2559 return msg_bcast_ack(buf_msg(buf));
2560 }
2561
2562 static void set_expected_frags(struct sk_buff *buf, u32 exp)
2563 {
2564 msg_set_bcast_ack(buf_msg(buf), exp);
2565 }
2566
2567 static u32 get_timer_cnt(struct sk_buff *buf)
2568 {
2569 return msg_reroute_cnt(buf_msg(buf));
2570 }
2571
2572 static void incr_timer_cnt(struct sk_buff *buf)
2573 {
2574 msg_incr_reroute_cnt(buf_msg(buf));
2575 }
2576
2577 /*
2578 * tipc_link_recv_fragment(): Called with node lock on. Returns
2579 * the reassembled buffer if message is complete.
2580 */
2581 int tipc_link_recv_fragment(struct sk_buff **pending, struct sk_buff **fb,
2582 struct tipc_msg **m)
2583 {
2584 struct sk_buff *prev = NULL;
2585 struct sk_buff *fbuf = *fb;
2586 struct tipc_msg *fragm = buf_msg(fbuf);
2587 struct sk_buff *pbuf = *pending;
2588 u32 long_msg_seq_no = msg_long_msgno(fragm);
2589
2590 *fb = NULL;
2591 msg_dbg(fragm,"FRG<REC<");
2592
2593 /* Is there an incomplete message waiting for this fragment? */
2594
2595 while (pbuf && ((msg_seqno(buf_msg(pbuf)) != long_msg_seq_no)
2596 || (msg_orignode(fragm) != msg_orignode(buf_msg(pbuf))))) {
2597 prev = pbuf;
2598 pbuf = pbuf->next;
2599 }
2600
2601 if (!pbuf && (msg_type(fragm) == FIRST_FRAGMENT)) {
2602 struct tipc_msg *imsg = (struct tipc_msg *)msg_data(fragm);
2603 u32 msg_sz = msg_size(imsg);
2604 u32 fragm_sz = msg_data_sz(fragm);
2605 u32 exp_fragm_cnt = msg_sz/fragm_sz + !!(msg_sz % fragm_sz);
2606 u32 max = TIPC_MAX_USER_MSG_SIZE + LONG_H_SIZE;
2607 if (msg_type(imsg) == TIPC_MCAST_MSG)
2608 max = TIPC_MAX_USER_MSG_SIZE + MCAST_H_SIZE;
2609 if (msg_size(imsg) > max) {
2610 msg_dbg(fragm,"<REC<Oversized: ");
2611 buf_discard(fbuf);
2612 return 0;
2613 }
2614 pbuf = buf_acquire(msg_size(imsg));
2615 if (pbuf != NULL) {
2616 pbuf->next = *pending;
2617 *pending = pbuf;
2618 memcpy(pbuf->data, (unchar *)imsg, msg_data_sz(fragm));
2619
2620 /* Prepare buffer for subsequent fragments. */
2621
2622 set_long_msg_seqno(pbuf, long_msg_seq_no);
2623 set_fragm_size(pbuf,fragm_sz);
2624 set_expected_frags(pbuf,exp_fragm_cnt - 1);
2625 } else {
2626 warn("Memory squeeze; got no defragmenting buffer\n");
2627 }
2628 buf_discard(fbuf);
2629 return 0;
2630 } else if (pbuf && (msg_type(fragm) != FIRST_FRAGMENT)) {
2631 u32 dsz = msg_data_sz(fragm);
2632 u32 fsz = get_fragm_size(pbuf);
2633 u32 crs = ((msg_fragm_no(fragm) - 1) * fsz);
2634 u32 exp_frags = get_expected_frags(pbuf) - 1;
2635 memcpy(pbuf->data + crs, msg_data(fragm), dsz);
2636 buf_discard(fbuf);
2637
2638 /* Is message complete? */
2639
2640 if (exp_frags == 0) {
2641 if (prev)
2642 prev->next = pbuf->next;
2643 else
2644 *pending = pbuf->next;
2645 msg_reset_reroute_cnt(buf_msg(pbuf));
2646 *fb = pbuf;
2647 *m = buf_msg(pbuf);
2648 return 1;
2649 }
2650 set_expected_frags(pbuf,exp_frags);
2651 return 0;
2652 }
2653 dbg(" Discarding orphan fragment %x\n",fbuf);
2654 msg_dbg(fragm,"ORPHAN:");
2655 dbg("Pending long buffers:\n");
2656 dbg_print_buf_chain(*pending);
2657 buf_discard(fbuf);
2658 return 0;
2659 }
2660
2661 /**
2662 * link_check_defragm_bufs - flush stale incoming message fragments
2663 * @l_ptr: pointer to link
2664 */
2665
2666 static void link_check_defragm_bufs(struct link *l_ptr)
2667 {
2668 struct sk_buff *prev = NULL;
2669 struct sk_buff *next = NULL;
2670 struct sk_buff *buf = l_ptr->defragm_buf;
2671
2672 if (!buf)
2673 return;
2674 if (!link_working_working(l_ptr))
2675 return;
2676 while (buf) {
2677 u32 cnt = get_timer_cnt(buf);
2678
2679 next = buf->next;
2680 if (cnt < 4) {
2681 incr_timer_cnt(buf);
2682 prev = buf;
2683 } else {
2684 dbg(" Discarding incomplete long buffer\n");
2685 msg_dbg(buf_msg(buf), "LONG:");
2686 dbg_print_link(l_ptr, "curr:");
2687 dbg("Pending long buffers:\n");
2688 dbg_print_buf_chain(l_ptr->defragm_buf);
2689 if (prev)
2690 prev->next = buf->next;
2691 else
2692 l_ptr->defragm_buf = buf->next;
2693 buf_discard(buf);
2694 }
2695 buf = next;
2696 }
2697 }
2698
2699
2700
2701 static void link_set_supervision_props(struct link *l_ptr, u32 tolerance)
2702 {
2703 l_ptr->tolerance = tolerance;
2704 l_ptr->continuity_interval =
2705 ((tolerance / 4) > 500) ? 500 : tolerance / 4;
2706 l_ptr->abort_limit = tolerance / (l_ptr->continuity_interval / 4);
2707 }
2708
2709
2710 void tipc_link_set_queue_limits(struct link *l_ptr, u32 window)
2711 {
2712 /* Data messages from this node, inclusive FIRST_FRAGM */
2713 l_ptr->queue_limit[DATA_LOW] = window;
2714 l_ptr->queue_limit[DATA_MEDIUM] = (window / 3) * 4;
2715 l_ptr->queue_limit[DATA_HIGH] = (window / 3) * 5;
2716 l_ptr->queue_limit[DATA_CRITICAL] = (window / 3) * 6;
2717 /* Transiting data messages,inclusive FIRST_FRAGM */
2718 l_ptr->queue_limit[DATA_LOW + 4] = 300;
2719 l_ptr->queue_limit[DATA_MEDIUM + 4] = 600;
2720 l_ptr->queue_limit[DATA_HIGH + 4] = 900;
2721 l_ptr->queue_limit[DATA_CRITICAL + 4] = 1200;
2722 l_ptr->queue_limit[CONN_MANAGER] = 1200;
2723 l_ptr->queue_limit[ROUTE_DISTRIBUTOR] = 1200;
2724 l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500;
2725 l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000;
2726 /* FRAGMENT and LAST_FRAGMENT packets */
2727 l_ptr->queue_limit[MSG_FRAGMENTER] = 4000;
2728 }
2729
2730 /**
2731 * link_find_link - locate link by name
2732 * @name - ptr to link name string
2733 * @node - ptr to area to be filled with ptr to associated node
2734 *
2735 * Caller must hold 'tipc_net_lock' to ensure node and bearer are not deleted;
2736 * this also prevents link deletion.
2737 *
2738 * Returns pointer to link (or 0 if invalid link name).
2739 */
2740
2741 static struct link *link_find_link(const char *name, struct node **node)
2742 {
2743 struct link_name link_name_parts;
2744 struct bearer *b_ptr;
2745 struct link *l_ptr;
2746
2747 if (!link_name_validate(name, &link_name_parts))
2748 return NULL;
2749
2750 b_ptr = tipc_bearer_find_interface(link_name_parts.if_local);
2751 if (!b_ptr)
2752 return NULL;
2753
2754 *node = tipc_node_find(link_name_parts.addr_peer);
2755 if (!*node)
2756 return NULL;
2757
2758 l_ptr = (*node)->links[b_ptr->identity];
2759 if (!l_ptr || strcmp(l_ptr->name, name))
2760 return NULL;
2761
2762 return l_ptr;
2763 }
2764
2765 struct sk_buff *tipc_link_cmd_config(const void *req_tlv_area, int req_tlv_space,
2766 u16 cmd)
2767 {
2768 struct tipc_link_config *args;
2769 u32 new_value;
2770 struct link *l_ptr;
2771 struct node *node;
2772 int res;
2773
2774 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG))
2775 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
2776
2777 args = (struct tipc_link_config *)TLV_DATA(req_tlv_area);
2778 new_value = ntohl(args->value);
2779
2780 if (!strcmp(args->name, tipc_bclink_name)) {
2781 if ((cmd == TIPC_CMD_SET_LINK_WINDOW) &&
2782 (tipc_bclink_set_queue_limits(new_value) == 0))
2783 return tipc_cfg_reply_none();
2784 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
2785 " (cannot change setting on broadcast link)");
2786 }
2787
2788 read_lock_bh(&tipc_net_lock);
2789 l_ptr = link_find_link(args->name, &node);
2790 if (!l_ptr) {
2791 read_unlock_bh(&tipc_net_lock);
2792 return tipc_cfg_reply_error_string("link not found");
2793 }
2794
2795 tipc_node_lock(node);
2796 res = -EINVAL;
2797 switch (cmd) {
2798 case TIPC_CMD_SET_LINK_TOL:
2799 if ((new_value >= TIPC_MIN_LINK_TOL) &&
2800 (new_value <= TIPC_MAX_LINK_TOL)) {
2801 link_set_supervision_props(l_ptr, new_value);
2802 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2803 0, 0, new_value, 0, 0);
2804 res = TIPC_OK;
2805 }
2806 break;
2807 case TIPC_CMD_SET_LINK_PRI:
2808 if ((new_value >= TIPC_MIN_LINK_PRI) &&
2809 (new_value <= TIPC_MAX_LINK_PRI)) {
2810 l_ptr->priority = new_value;
2811 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2812 0, 0, 0, new_value, 0);
2813 res = TIPC_OK;
2814 }
2815 break;
2816 case TIPC_CMD_SET_LINK_WINDOW:
2817 if ((new_value >= TIPC_MIN_LINK_WIN) &&
2818 (new_value <= TIPC_MAX_LINK_WIN)) {
2819 tipc_link_set_queue_limits(l_ptr, new_value);
2820 res = TIPC_OK;
2821 }
2822 break;
2823 }
2824 tipc_node_unlock(node);
2825
2826 read_unlock_bh(&tipc_net_lock);
2827 if (res)
2828 return tipc_cfg_reply_error_string("cannot change link setting");
2829
2830 return tipc_cfg_reply_none();
2831 }
2832
2833 /**
2834 * link_reset_statistics - reset link statistics
2835 * @l_ptr: pointer to link
2836 */
2837
2838 static void link_reset_statistics(struct link *l_ptr)
2839 {
2840 memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
2841 l_ptr->stats.sent_info = l_ptr->next_out_no;
2842 l_ptr->stats.recv_info = l_ptr->next_in_no;
2843 }
2844
2845 struct sk_buff *tipc_link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space)
2846 {
2847 char *link_name;
2848 struct link *l_ptr;
2849 struct node *node;
2850
2851 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
2852 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
2853
2854 link_name = (char *)TLV_DATA(req_tlv_area);
2855 if (!strcmp(link_name, tipc_bclink_name)) {
2856 if (tipc_bclink_reset_stats())
2857 return tipc_cfg_reply_error_string("link not found");
2858 return tipc_cfg_reply_none();
2859 }
2860
2861 read_lock_bh(&tipc_net_lock);
2862 l_ptr = link_find_link(link_name, &node);
2863 if (!l_ptr) {
2864 read_unlock_bh(&tipc_net_lock);
2865 return tipc_cfg_reply_error_string("link not found");
2866 }
2867
2868 tipc_node_lock(node);
2869 link_reset_statistics(l_ptr);
2870 tipc_node_unlock(node);
2871 read_unlock_bh(&tipc_net_lock);
2872 return tipc_cfg_reply_none();
2873 }
2874
2875 /**
2876 * percent - convert count to a percentage of total (rounding up or down)
2877 */
2878
2879 static u32 percent(u32 count, u32 total)
2880 {
2881 return (count * 100 + (total / 2)) / total;
2882 }
2883
2884 /**
2885 * tipc_link_stats - print link statistics
2886 * @name: link name
2887 * @buf: print buffer area
2888 * @buf_size: size of print buffer area
2889 *
2890 * Returns length of print buffer data string (or 0 if error)
2891 */
2892
2893 static int tipc_link_stats(const char *name, char *buf, const u32 buf_size)
2894 {
2895 struct print_buf pb;
2896 struct link *l_ptr;
2897 struct node *node;
2898 char *status;
2899 u32 profile_total = 0;
2900
2901 if (!strcmp(name, tipc_bclink_name))
2902 return tipc_bclink_stats(buf, buf_size);
2903
2904 tipc_printbuf_init(&pb, buf, buf_size);
2905
2906 read_lock_bh(&tipc_net_lock);
2907 l_ptr = link_find_link(name, &node);
2908 if (!l_ptr) {
2909 read_unlock_bh(&tipc_net_lock);
2910 return 0;
2911 }
2912 tipc_node_lock(node);
2913
2914 if (tipc_link_is_active(l_ptr))
2915 status = "ACTIVE";
2916 else if (tipc_link_is_up(l_ptr))
2917 status = "STANDBY";
2918 else
2919 status = "DEFUNCT";
2920 tipc_printf(&pb, "Link <%s>\n"
2921 " %s MTU:%u Priority:%u Tolerance:%u ms"
2922 " Window:%u packets\n",
2923 l_ptr->name, status, link_max_pkt(l_ptr),
2924 l_ptr->priority, l_ptr->tolerance, l_ptr->queue_limit[0]);
2925 tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
2926 l_ptr->next_in_no - l_ptr->stats.recv_info,
2927 l_ptr->stats.recv_fragments,
2928 l_ptr->stats.recv_fragmented,
2929 l_ptr->stats.recv_bundles,
2930 l_ptr->stats.recv_bundled);
2931 tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
2932 l_ptr->next_out_no - l_ptr->stats.sent_info,
2933 l_ptr->stats.sent_fragments,
2934 l_ptr->stats.sent_fragmented,
2935 l_ptr->stats.sent_bundles,
2936 l_ptr->stats.sent_bundled);
2937 profile_total = l_ptr->stats.msg_length_counts;
2938 if (!profile_total)
2939 profile_total = 1;
2940 tipc_printf(&pb, " TX profile sample:%u packets average:%u octets\n"
2941 " 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% "
2942 "-16354:%u%% -32768:%u%% -66000:%u%%\n",
2943 l_ptr->stats.msg_length_counts,
2944 l_ptr->stats.msg_lengths_total / profile_total,
2945 percent(l_ptr->stats.msg_length_profile[0], profile_total),
2946 percent(l_ptr->stats.msg_length_profile[1], profile_total),
2947 percent(l_ptr->stats.msg_length_profile[2], profile_total),
2948 percent(l_ptr->stats.msg_length_profile[3], profile_total),
2949 percent(l_ptr->stats.msg_length_profile[4], profile_total),
2950 percent(l_ptr->stats.msg_length_profile[5], profile_total),
2951 percent(l_ptr->stats.msg_length_profile[6], profile_total));
2952 tipc_printf(&pb, " RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
2953 l_ptr->stats.recv_states,
2954 l_ptr->stats.recv_probes,
2955 l_ptr->stats.recv_nacks,
2956 l_ptr->stats.deferred_recv,
2957 l_ptr->stats.duplicates);
2958 tipc_printf(&pb, " TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
2959 l_ptr->stats.sent_states,
2960 l_ptr->stats.sent_probes,
2961 l_ptr->stats.sent_nacks,
2962 l_ptr->stats.sent_acks,
2963 l_ptr->stats.retransmitted);
2964 tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n",
2965 l_ptr->stats.bearer_congs,
2966 l_ptr->stats.link_congs,
2967 l_ptr->stats.max_queue_sz,
2968 l_ptr->stats.queue_sz_counts
2969 ? (l_ptr->stats.accu_queue_sz / l_ptr->stats.queue_sz_counts)
2970 : 0);
2971
2972 tipc_node_unlock(node);
2973 read_unlock_bh(&tipc_net_lock);
2974 return tipc_printbuf_validate(&pb);
2975 }
2976
2977 #define MAX_LINK_STATS_INFO 2000
2978
2979 struct sk_buff *tipc_link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space)
2980 {
2981 struct sk_buff *buf;
2982 struct tlv_desc *rep_tlv;
2983 int str_len;
2984
2985 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
2986 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
2987
2988 buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_LINK_STATS_INFO));
2989 if (!buf)
2990 return NULL;
2991
2992 rep_tlv = (struct tlv_desc *)buf->data;
2993
2994 str_len = tipc_link_stats((char *)TLV_DATA(req_tlv_area),
2995 (char *)TLV_DATA(rep_tlv), MAX_LINK_STATS_INFO);
2996 if (!str_len) {
2997 buf_discard(buf);
2998 return tipc_cfg_reply_error_string("link not found");
2999 }
3000
3001 skb_put(buf, TLV_SPACE(str_len));
3002 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
3003
3004 return buf;
3005 }
3006
3007 #if 0
3008 int link_control(const char *name, u32 op, u32 val)
3009 {
3010 int res = -EINVAL;
3011 struct link *l_ptr;
3012 u32 bearer_id;
3013 struct node * node;
3014 u32 a;
3015
3016 a = link_name2addr(name, &bearer_id);
3017 read_lock_bh(&tipc_net_lock);
3018 node = tipc_node_find(a);
3019 if (node) {
3020 tipc_node_lock(node);
3021 l_ptr = node->links[bearer_id];
3022 if (l_ptr) {
3023 if (op == TIPC_REMOVE_LINK) {
3024 struct bearer *b_ptr = l_ptr->b_ptr;
3025 spin_lock_bh(&b_ptr->publ.lock);
3026 tipc_link_delete(l_ptr);
3027 spin_unlock_bh(&b_ptr->publ.lock);
3028 }
3029 if (op == TIPC_CMD_BLOCK_LINK) {
3030 tipc_link_reset(l_ptr);
3031 l_ptr->blocked = 1;
3032 }
3033 if (op == TIPC_CMD_UNBLOCK_LINK) {
3034 l_ptr->blocked = 0;
3035 }
3036 res = TIPC_OK;
3037 }
3038 tipc_node_unlock(node);
3039 }
3040 read_unlock_bh(&tipc_net_lock);
3041 return res;
3042 }
3043 #endif
3044
3045 /**
3046 * tipc_link_get_max_pkt - get maximum packet size to use when sending to destination
3047 * @dest: network address of destination node
3048 * @selector: used to select from set of active links
3049 *
3050 * If no active link can be found, uses default maximum packet size.
3051 */
3052
3053 u32 tipc_link_get_max_pkt(u32 dest, u32 selector)
3054 {
3055 struct node *n_ptr;
3056 struct link *l_ptr;
3057 u32 res = MAX_PKT_DEFAULT;
3058
3059 if (dest == tipc_own_addr)
3060 return MAX_MSG_SIZE;
3061
3062 read_lock_bh(&tipc_net_lock);
3063 n_ptr = tipc_node_select(dest, selector);
3064 if (n_ptr) {
3065 tipc_node_lock(n_ptr);
3066 l_ptr = n_ptr->active_links[selector & 1];
3067 if (l_ptr)
3068 res = link_max_pkt(l_ptr);
3069 tipc_node_unlock(n_ptr);
3070 }
3071 read_unlock_bh(&tipc_net_lock);
3072 return res;
3073 }
3074
3075 #if 0
3076 static void link_dump_rec_queue(struct link *l_ptr)
3077 {
3078 struct sk_buff *crs;
3079
3080 if (!l_ptr->oldest_deferred_in) {
3081 info("Reception queue empty\n");
3082 return;
3083 }
3084 info("Contents of Reception queue:\n");
3085 crs = l_ptr->oldest_deferred_in;
3086 while (crs) {
3087 if (crs->data == (void *)0x0000a3a3) {
3088 info("buffer %x invalid\n", crs);
3089 return;
3090 }
3091 msg_dbg(buf_msg(crs), "In rec queue: \n");
3092 crs = crs->next;
3093 }
3094 }
3095 #endif
3096
3097 static void link_dump_send_queue(struct link *l_ptr)
3098 {
3099 if (l_ptr->next_out) {
3100 info("\nContents of unsent queue:\n");
3101 dbg_print_buf_chain(l_ptr->next_out);
3102 }
3103 info("\nContents of send queue:\n");
3104 if (l_ptr->first_out) {
3105 dbg_print_buf_chain(l_ptr->first_out);
3106 }
3107 info("Empty send queue\n");
3108 }
3109
3110 static void link_print(struct link *l_ptr, struct print_buf *buf,
3111 const char *str)
3112 {
3113 tipc_printf(buf, str);
3114 if (link_reset_reset(l_ptr) || link_reset_unknown(l_ptr))
3115 return;
3116 tipc_printf(buf, "Link %x<%s>:",
3117 l_ptr->addr, l_ptr->b_ptr->publ.name);
3118 tipc_printf(buf, ": NXO(%u):", mod(l_ptr->next_out_no));
3119 tipc_printf(buf, "NXI(%u):", mod(l_ptr->next_in_no));
3120 tipc_printf(buf, "SQUE");
3121 if (l_ptr->first_out) {
3122 tipc_printf(buf, "[%u..", msg_seqno(buf_msg(l_ptr->first_out)));
3123 if (l_ptr->next_out)
3124 tipc_printf(buf, "%u..",
3125 msg_seqno(buf_msg(l_ptr->next_out)));
3126 tipc_printf(buf, "%u]",
3127 msg_seqno(buf_msg
3128 (l_ptr->last_out)), l_ptr->out_queue_size);
3129 if ((mod(msg_seqno(buf_msg(l_ptr->last_out)) -
3130 msg_seqno(buf_msg(l_ptr->first_out)))
3131 != (l_ptr->out_queue_size - 1))
3132 || (l_ptr->last_out->next != 0)) {
3133 tipc_printf(buf, "\nSend queue inconsistency\n");
3134 tipc_printf(buf, "first_out= %x ", l_ptr->first_out);
3135 tipc_printf(buf, "next_out= %x ", l_ptr->next_out);
3136 tipc_printf(buf, "last_out= %x ", l_ptr->last_out);
3137 link_dump_send_queue(l_ptr);
3138 }
3139 } else
3140 tipc_printf(buf, "[]");
3141 tipc_printf(buf, "SQSIZ(%u)", l_ptr->out_queue_size);
3142 if (l_ptr->oldest_deferred_in) {
3143 u32 o = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
3144 u32 n = msg_seqno(buf_msg(l_ptr->newest_deferred_in));
3145 tipc_printf(buf, ":RQUE[%u..%u]", o, n);
3146 if (l_ptr->deferred_inqueue_sz != mod((n + 1) - o)) {
3147 tipc_printf(buf, ":RQSIZ(%u)",
3148 l_ptr->deferred_inqueue_sz);
3149 }
3150 }
3151 if (link_working_unknown(l_ptr))
3152 tipc_printf(buf, ":WU");
3153 if (link_reset_reset(l_ptr))
3154 tipc_printf(buf, ":RR");
3155 if (link_reset_unknown(l_ptr))
3156 tipc_printf(buf, ":RU");
3157 if (link_working_working(l_ptr))
3158 tipc_printf(buf, ":WW");
3159 tipc_printf(buf, "\n");
3160 }
3161
WRT350N Kernel Patches