File: /usr/src/linux/drivers/net/skfp/cfm.c
1 /******************************************************************************
2 *
3 * (C)Copyright 1998,1999 SysKonnect,
4 * a business unit of Schneider & Koch & Co. Datensysteme GmbH.
5 *
6 * See the file "skfddi.c" for further information.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * The information in this file is provided "AS IS" without warranty.
14 *
15 ******************************************************************************/
16
17 /*
18 SMT CFM
19 Configuration Management
20 DAS with single MAC
21 */
22
23 /*
24 * Hardware independant state machine implemantation
25 * The following external SMT functions are referenced :
26 *
27 * queue_event()
28 *
29 * The following external HW dependant functions are referenced :
30 * config_mux()
31 *
32 * The following HW dependant events are required :
33 * NONE
34 */
35
36 #include "h/types.h"
37 #include "h/fddi.h"
38 #include "h/smc.h"
39
40 #define KERNEL
41 #include "h/smtstate.h"
42
43 #ifndef lint
44 static const char ID_sccs[] = "@(#)cfm.c 2.18 98/10/06 (C) SK " ;
45 #endif
46
47 /*
48 * FSM Macros
49 */
50 #define AFLAG 0x10
51 #define GO_STATE(x) (smc->mib.fddiSMTCF_State = (x)|AFLAG)
52 #define ACTIONS_DONE() (smc->mib.fddiSMTCF_State &= ~AFLAG)
53 #define ACTIONS(x) (x|AFLAG)
54
55 #ifdef DEBUG
56 /*
57 * symbolic state names
58 */
59 static const char * const cfm_states[] = {
60 "SC0_ISOLATED","CF1","CF2","CF3","CF4",
61 "SC1_WRAP_A","SC2_WRAP_B","SC5_TRHU_B","SC7_WRAP_S",
62 "SC9_C_WRAP_A","SC10_C_WRAP_B","SC11_C_WRAP_S","SC4_THRU_A"
63 } ;
64
65 /*
66 * symbolic event names
67 */
68 static const char * const cfm_events[] = {
69 "NONE","CF_LOOP_A","CF_LOOP_B","CF_JOIN_A","CF_JOIN_B"
70 } ;
71 #endif
72
73 /*
74 * map from state to downstream port type
75 */
76 static const u_char cf_to_ptype[] = {
77 TNONE,TNONE,TNONE,TNONE,TNONE,
78 TNONE,TB,TB,TS,
79 TA,TB,TS,TB
80 } ;
81
82 /*
83 * CEM port states
84 */
85 #define CEM_PST_DOWN 0
86 #define CEM_PST_UP 1
87 #define CEM_PST_HOLD 2
88 /* define portstate array only for A and B port */
89 /* Do this within the smc structure (use in multiple cards) */
90
91 /*
92 * all Globals are defined in smc.h
93 * struct s_cfm
94 */
95
96 /*
97 * function declarations
98 */
99 static void cfm_fsm() ;
100
101 /*
102 init CFM state machine
103 clear all CFM vars and flags
104 */
105 void cfm_init(smc)
106 struct s_smc *smc ;
107 {
108 smc->mib.fddiSMTCF_State = ACTIONS(SC0_ISOLATED) ;
109 smc->r.rm_join = 0 ;
110 smc->r.rm_loop = 0 ;
111 smc->y[PA].scrub = 0 ;
112 smc->y[PB].scrub = 0 ;
113 smc->y[PA].cem_pst = CEM_PST_DOWN ;
114 smc->y[PB].cem_pst = CEM_PST_DOWN ;
115 }
116
117 /* Some terms conditions used by the selection criteria */
118 #define THRU_ENABLED(smc) (smc->y[PA].pc_mode != PM_TREE && \
119 smc->y[PB].pc_mode != PM_TREE)
120 /* Selection criteria for the ports */
121 static void selection_criteria (smc,phy)
122 struct s_smc *smc ;
123 struct s_phy *phy ;
124 {
125
126 switch (phy->mib->fddiPORTMy_Type) {
127 case TA:
128 if ( !THRU_ENABLED(smc) && smc->y[PB].cf_join ) {
129 phy->wc_flag = TRUE ;
130 } else {
131 phy->wc_flag = FALSE ;
132 }
133
134 break;
135 case TB:
136 /* take precedence over PA */
137 phy->wc_flag = FALSE ;
138 break;
139 case TS:
140 phy->wc_flag = FALSE ;
141 break;
142 case TM:
143 phy->wc_flag = FALSE ;
144 break;
145 }
146
147 }
148
149 void all_selection_criteria (smc)
150 struct s_smc *smc ;
151 {
152 struct s_phy *phy ;
153 int p ;
154
155 for ( p = 0,phy = smc->y ; p < NUMPHYS; p++, phy++ ) {
156 /* Do the selection criteria */
157 selection_criteria (smc,phy);
158 }
159 }
160
161 static void cem_priv_state (smc, event)
162 struct s_smc *smc ;
163 int event ;
164 /* State machine for private PORT states: used to optimize dual homing */
165 {
166 int np; /* Number of the port */
167 int i;
168
169 /* Do this only in a DAS */
170 if (smc->s.sas != SMT_DAS )
171 return ;
172
173 np = event - CF_JOIN;
174
175 if (np != PA && np != PB) {
176 return ;
177 }
178 /* Change the port state according to the event (portnumber) */
179 if (smc->y[np].cf_join) {
180 smc->y[np].cem_pst = CEM_PST_UP ;
181 } else if (!smc->y[np].wc_flag) {
182 /* set the port to done only if it is not withheld */
183 smc->y[np].cem_pst = CEM_PST_DOWN ;
184 }
185
186 /* Don't set an hold port to down */
187
188 /* Check all ports of restart conditions */
189 for (i = 0 ; i < 2 ; i ++ ) {
190 /* Check all port for PORT is on hold and no withhold is done */
191 if ( smc->y[i].cem_pst == CEM_PST_HOLD && !smc->y[i].wc_flag ) {
192 smc->y[i].cem_pst = CEM_PST_DOWN;
193 queue_event(smc,(int)(EVENT_PCM+i),PC_START) ;
194 }
195 if ( smc->y[i].cem_pst == CEM_PST_UP && smc->y[i].wc_flag ) {
196 smc->y[i].cem_pst = CEM_PST_HOLD;
197 queue_event(smc,(int)(EVENT_PCM+i),PC_START) ;
198 }
199 if ( smc->y[i].cem_pst == CEM_PST_DOWN && smc->y[i].wc_flag ) {
200 /*
201 * The port must be restarted when the wc_flag
202 * will be reset. So set the port on hold.
203 */
204 smc->y[i].cem_pst = CEM_PST_HOLD;
205 }
206 }
207 return ;
208 }
209
210 /*
211 CFM state machine
212 called by dispatcher
213
214 do
215 display state change
216 process event
217 until SM is stable
218 */
219 void cfm(smc,event)
220 struct s_smc *smc ;
221 int event ;
222 {
223 int state ; /* remember last state */
224 int cond ;
225 int oldstate ;
226
227 /* We will do the following: */
228 /* - compute the variable WC_Flag for every port (This is where */
229 /* we can extend the requested path checking !!) */
230 /* - do the old (SMT 6.2 like) state machine */
231 /* - do the resulting station states */
232
233 all_selection_criteria (smc);
234
235 /* We will check now whether a state transition is allowed or not */
236 /* - change the portstates */
237 cem_priv_state (smc, event);
238
239 oldstate = smc->mib.fddiSMTCF_State ;
240 do {
241 DB_CFM("CFM : state %s%s",
242 (smc->mib.fddiSMTCF_State & AFLAG) ? "ACTIONS " : "",
243 cfm_states[smc->mib.fddiSMTCF_State & ~AFLAG]) ;
244 DB_CFM(" event %s\n",cfm_events[event],0) ;
245 state = smc->mib.fddiSMTCF_State ;
246 cfm_fsm(smc,event) ;
247 event = 0 ;
248 } while (state != smc->mib.fddiSMTCF_State) ;
249
250 #ifndef SLIM_SMT
251 /*
252 * check peer wrap condition
253 */
254 cond = FALSE ;
255 if ( (smc->mib.fddiSMTCF_State == SC9_C_WRAP_A &&
256 smc->y[PA].pc_mode == PM_PEER) ||
257 (smc->mib.fddiSMTCF_State == SC10_C_WRAP_B &&
258 smc->y[PB].pc_mode == PM_PEER) ||
259 (smc->mib.fddiSMTCF_State == SC11_C_WRAP_S &&
260 smc->y[PS].pc_mode == PM_PEER &&
261 smc->y[PS].mib->fddiPORTNeighborType != TS ) ) {
262 cond = TRUE ;
263 }
264 if (cond != smc->mib.fddiSMTPeerWrapFlag)
265 smt_srf_event(smc,SMT_COND_SMT_PEER_WRAP,0,cond) ;
266
267 #if 0
268 /*
269 * Don't send ever MAC_PATH_CHANGE events. Our MAC is hard-wired
270 * to the primary path.
271 */
272 /*
273 * path change
274 */
275 if (smc->mib.fddiSMTCF_State != oldstate) {
276 smt_srf_event(smc,SMT_EVENT_MAC_PATH_CHANGE,INDEX_MAC,0) ;
277 }
278 #endif
279 #endif /* no SLIM_SMT */
280
281 /*
282 * set MAC port type
283 */
284 smc->mib.m[MAC0].fddiMACDownstreamPORTType =
285 cf_to_ptype[smc->mib.fddiSMTCF_State] ;
286 cfm_state_change(smc,(int)smc->mib.fddiSMTCF_State) ;
287 }
288
289 /*
290 process CFM event
291 */
292 /*ARGSUSED1*/
293 static void cfm_fsm(smc,cmd)
294 struct s_smc *smc ;
295 int cmd ;
296 {
297 switch(smc->mib.fddiSMTCF_State) {
298 case ACTIONS(SC0_ISOLATED) :
299 smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
300 smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
301 smc->mib.p[PA].fddiPORTMACPlacement = 0 ;
302 smc->mib.p[PB].fddiPORTMACPlacement = 0 ;
303 smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_SEPA ;
304 config_mux(smc,MUX_ISOLATE) ; /* configure PHY Mux */
305 smc->r.rm_loop = FALSE ;
306 smc->r.rm_join = FALSE ;
307 queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
308 /* Don't do the WC-Flag changing here */
309 ACTIONS_DONE() ;
310 DB_CFMN(1,"CFM : %s\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
311 break;
312 case SC0_ISOLATED :
313 /*SC07*/
314 /*SAS port can be PA or PB ! */
315 if (smc->s.sas && (smc->y[PA].cf_join || smc->y[PA].cf_loop ||
316 smc->y[PB].cf_join || smc->y[PB].cf_loop)) {
317 GO_STATE(SC11_C_WRAP_S) ;
318 break ;
319 }
320 /*SC01*/
321 if ((smc->y[PA].cem_pst == CEM_PST_UP && smc->y[PA].cf_join &&
322 !smc->y[PA].wc_flag) || smc->y[PA].cf_loop) {
323 GO_STATE(SC9_C_WRAP_A) ;
324 break ;
325 }
326 /*SC02*/
327 if ((smc->y[PB].cem_pst == CEM_PST_UP && smc->y[PB].cf_join &&
328 !smc->y[PB].wc_flag) || smc->y[PB].cf_loop) {
329 GO_STATE(SC10_C_WRAP_B) ;
330 break ;
331 }
332 break ;
333 case ACTIONS(SC9_C_WRAP_A) :
334 smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_CONCATENATED ;
335 smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
336 smc->mib.p[PA].fddiPORTMACPlacement = INDEX_MAC ;
337 smc->mib.p[PB].fddiPORTMACPlacement = 0 ;
338 smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_CON ;
339 config_mux(smc,MUX_WRAPA) ; /* configure PHY mux */
340 if (smc->y[PA].cf_loop) {
341 smc->r.rm_join = FALSE ;
342 smc->r.rm_loop = TRUE ;
343 queue_event(smc,EVENT_RMT,RM_LOOP) ;/* signal RMT */
344 }
345 if (smc->y[PA].cf_join) {
346 smc->r.rm_loop = FALSE ;
347 smc->r.rm_join = TRUE ;
348 queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
349 }
350 ACTIONS_DONE() ;
351 DB_CFMN(1,"CFM : %s\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
352 break ;
353 case SC9_C_WRAP_A :
354 /*SC10*/
355 if ( (smc->y[PA].wc_flag || !smc->y[PA].cf_join) &&
356 !smc->y[PA].cf_loop ) {
357 GO_STATE(SC0_ISOLATED) ;
358 break ;
359 }
360 /*SC12*/
361 else if ( (smc->y[PB].cf_loop && smc->y[PA].cf_join &&
362 smc->y[PA].cem_pst == CEM_PST_UP) ||
363 ((smc->y[PB].cf_loop ||
364 (smc->y[PB].cf_join &&
365 smc->y[PB].cem_pst == CEM_PST_UP)) &&
366 (smc->y[PA].pc_mode == PM_TREE ||
367 smc->y[PB].pc_mode == PM_TREE))) {
368 smc->y[PA].scrub = TRUE ;
369 GO_STATE(SC10_C_WRAP_B) ;
370 break ;
371 }
372 /*SC14*/
373 else if (!smc->s.attach_s &&
374 smc->y[PA].cf_join &&
375 smc->y[PA].cem_pst == CEM_PST_UP &&
376 smc->y[PA].pc_mode == PM_PEER && smc->y[PB].cf_join &&
377 smc->y[PB].cem_pst == CEM_PST_UP &&
378 smc->y[PB].pc_mode == PM_PEER) {
379 smc->y[PA].scrub = TRUE ;
380 smc->y[PB].scrub = TRUE ;
381 GO_STATE(SC4_THRU_A) ;
382 break ;
383 }
384 /*SC15*/
385 else if ( smc->s.attach_s &&
386 smc->y[PA].cf_join &&
387 smc->y[PA].cem_pst == CEM_PST_UP &&
388 smc->y[PA].pc_mode == PM_PEER &&
389 smc->y[PB].cf_join &&
390 smc->y[PB].cem_pst == CEM_PST_UP &&
391 smc->y[PB].pc_mode == PM_PEER) {
392 smc->y[PA].scrub = TRUE ;
393 smc->y[PB].scrub = TRUE ;
394 GO_STATE(SC5_THRU_B) ;
395 break ;
396 }
397 break ;
398 case ACTIONS(SC10_C_WRAP_B) :
399 smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
400 smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_CONCATENATED ;
401 smc->mib.p[PA].fddiPORTMACPlacement = 0 ;
402 smc->mib.p[PB].fddiPORTMACPlacement = INDEX_MAC ;
403 smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_CON ;
404 config_mux(smc,MUX_WRAPB) ; /* configure PHY mux */
405 if (smc->y[PB].cf_loop) {
406 smc->r.rm_join = FALSE ;
407 smc->r.rm_loop = TRUE ;
408 queue_event(smc,EVENT_RMT,RM_LOOP) ;/* signal RMT */
409 }
410 if (smc->y[PB].cf_join) {
411 smc->r.rm_loop = FALSE ;
412 smc->r.rm_join = TRUE ;
413 queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
414 }
415 ACTIONS_DONE() ;
416 DB_CFMN(1,"CFM : %s\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
417 break ;
418 case SC10_C_WRAP_B :
419 /*SC20*/
420 if ( !smc->y[PB].cf_join && !smc->y[PB].cf_loop ) {
421 GO_STATE(SC0_ISOLATED) ;
422 break ;
423 }
424 /*SC21*/
425 else if ( smc->y[PA].cf_loop && smc->y[PA].pc_mode == PM_PEER &&
426 smc->y[PB].cf_join && smc->y[PB].pc_mode == PM_PEER) {
427 smc->y[PB].scrub = TRUE ;
428 GO_STATE(SC9_C_WRAP_A) ;
429 break ;
430 }
431 /*SC24*/
432 else if (!smc->s.attach_s &&
433 smc->y[PA].cf_join && smc->y[PA].pc_mode == PM_PEER &&
434 smc->y[PB].cf_join && smc->y[PB].pc_mode == PM_PEER) {
435 smc->y[PA].scrub = TRUE ;
436 smc->y[PB].scrub = TRUE ;
437 GO_STATE(SC4_THRU_A) ;
438 break ;
439 }
440 /*SC25*/
441 else if ( smc->s.attach_s &&
442 smc->y[PA].cf_join && smc->y[PA].pc_mode == PM_PEER &&
443 smc->y[PB].cf_join && smc->y[PB].pc_mode == PM_PEER) {
444 smc->y[PA].scrub = TRUE ;
445 smc->y[PB].scrub = TRUE ;
446 GO_STATE(SC5_THRU_B) ;
447 break ;
448 }
449 break ;
450 case ACTIONS(SC4_THRU_A) :
451 smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_THRU ;
452 smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_THRU ;
453 smc->mib.p[PA].fddiPORTMACPlacement = 0 ;
454 smc->mib.p[PB].fddiPORTMACPlacement = INDEX_MAC ;
455 smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_THRU ;
456 config_mux(smc,MUX_THRUA) ; /* configure PHY mux */
457 smc->r.rm_loop = FALSE ;
458 smc->r.rm_join = TRUE ;
459 queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
460 ACTIONS_DONE() ;
461 DB_CFMN(1,"CFM : %s\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
462 break ;
463 case SC4_THRU_A :
464 /*SC41*/
465 if (smc->y[PB].wc_flag || !smc->y[PB].cf_join) {
466 smc->y[PA].scrub = TRUE ;
467 GO_STATE(SC9_C_WRAP_A) ;
468 break ;
469 }
470 /*SC42*/
471 else if (!smc->y[PA].cf_join || smc->y[PA].wc_flag) {
472 smc->y[PB].scrub = TRUE ;
473 GO_STATE(SC10_C_WRAP_B) ;
474 break ;
475 }
476 /*SC45*/
477 else if (smc->s.attach_s) {
478 smc->y[PB].scrub = TRUE ;
479 GO_STATE(SC5_THRU_B) ;
480 break ;
481 }
482 break ;
483 case ACTIONS(SC5_THRU_B) :
484 smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_THRU ;
485 smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_THRU ;
486 smc->mib.p[PA].fddiPORTMACPlacement = INDEX_MAC ;
487 smc->mib.p[PB].fddiPORTMACPlacement = 0 ;
488 smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_THRU ;
489 config_mux(smc,MUX_THRUB) ; /* configure PHY mux */
490 smc->r.rm_loop = FALSE ;
491 smc->r.rm_join = TRUE ;
492 queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
493 ACTIONS_DONE() ;
494 DB_CFMN(1,"CFM : %s\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
495 break ;
496 case SC5_THRU_B :
497 /*SC51*/
498 if (!smc->y[PB].cf_join || smc->y[PB].wc_flag) {
499 smc->y[PA].scrub = TRUE ;
500 GO_STATE(SC9_C_WRAP_A) ;
501 break ;
502 }
503 /*SC52*/
504 else if (!smc->y[PA].cf_join || smc->y[PA].wc_flag) {
505 smc->y[PB].scrub = TRUE ;
506 GO_STATE(SC10_C_WRAP_B) ;
507 break ;
508 }
509 /*SC54*/
510 else if (!smc->s.attach_s) {
511 smc->y[PA].scrub = TRUE ;
512 GO_STATE(SC4_THRU_A) ;
513 break ;
514 }
515 break ;
516 case ACTIONS(SC11_C_WRAP_S) :
517 smc->mib.p[PS].fddiPORTCurrentPath = MIB_PATH_CONCATENATED ;
518 smc->mib.p[PS].fddiPORTMACPlacement = INDEX_MAC ;
519 smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_CON ;
520 config_mux(smc,MUX_WRAPS) ; /* configure PHY mux */
521 if (smc->y[PA].cf_loop || smc->y[PB].cf_loop) {
522 smc->r.rm_join = FALSE ;
523 smc->r.rm_loop = TRUE ;
524 queue_event(smc,EVENT_RMT,RM_LOOP) ;/* signal RMT */
525 }
526 if (smc->y[PA].cf_join || smc->y[PB].cf_join) {
527 smc->r.rm_loop = FALSE ;
528 smc->r.rm_join = TRUE ;
529 queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
530 }
531 ACTIONS_DONE() ;
532 DB_CFMN(1,"CFM : %s\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
533 break ;
534 case SC11_C_WRAP_S :
535 /*SC70*/
536 if ( !smc->y[PA].cf_join && !smc->y[PA].cf_loop &&
537 !smc->y[PB].cf_join && !smc->y[PB].cf_loop) {
538 GO_STATE(SC0_ISOLATED) ;
539 break ;
540 }
541 break ;
542 default:
543 SMT_PANIC(smc,SMT_E0106, SMT_E0106_MSG) ;
544 break;
545 }
546 }
547
548 /*
549 * get MAC's input Port
550 * return :
551 * PA or PB
552 */
553 int cfm_get_mac_input(smc)
554 struct s_smc *smc ;
555 {
556 return((smc->mib.fddiSMTCF_State == SC10_C_WRAP_B ||
557 smc->mib.fddiSMTCF_State == SC5_THRU_B) ? PB : PA) ;
558 }
559
560 /*
561 * get MAC's output Port
562 * return :
563 * PA or PB
564 */
565 int cfm_get_mac_output(smc)
566 struct s_smc *smc ;
567 {
568 return((smc->mib.fddiSMTCF_State == SC10_C_WRAP_B ||
569 smc->mib.fddiSMTCF_State == SC4_THRU_A) ? PB : PA) ;
570 }
571
572 static char path_iso[] = {
573 0,0, 0,RES_PORT, 0,PA + INDEX_PORT, 0,PATH_ISO,
574 0,0, 0,RES_MAC, 0,INDEX_MAC, 0,PATH_ISO,
575 0,0, 0,RES_PORT, 0,PB + INDEX_PORT, 0,PATH_ISO
576 } ;
577
578 static char path_wrap_a[] = {
579 0,0, 0,RES_PORT, 0,PA + INDEX_PORT, 0,PATH_PRIM,
580 0,0, 0,RES_MAC, 0,INDEX_MAC, 0,PATH_PRIM,
581 0,0, 0,RES_PORT, 0,PB + INDEX_PORT, 0,PATH_ISO
582 } ;
583
584 static char path_wrap_b[] = {
585 0,0, 0,RES_PORT, 0,PB + INDEX_PORT, 0,PATH_PRIM,
586 0,0, 0,RES_MAC, 0,INDEX_MAC, 0,PATH_PRIM,
587 0,0, 0,RES_PORT, 0,PA + INDEX_PORT, 0,PATH_ISO
588 } ;
589
590 static char path_thru[] = {
591 0,0, 0,RES_PORT, 0,PA + INDEX_PORT, 0,PATH_PRIM,
592 0,0, 0,RES_MAC, 0,INDEX_MAC, 0,PATH_PRIM,
593 0,0, 0,RES_PORT, 0,PB + INDEX_PORT, 0,PATH_PRIM
594 } ;
595
596 static char path_wrap_s[] = {
597 0,0, 0,RES_PORT, 0,PS + INDEX_PORT, 0,PATH_PRIM,
598 0,0, 0,RES_MAC, 0,INDEX_MAC, 0,PATH_PRIM,
599 } ;
600
601 static char path_iso_s[] = {
602 0,0, 0,RES_PORT, 0,PS + INDEX_PORT, 0,PATH_ISO,
603 0,0, 0,RES_MAC, 0,INDEX_MAC, 0,PATH_ISO,
604 } ;
605
606 int cem_build_path(smc,to,path_index)
607 struct s_smc *smc ;
608 char *to ;
609 int path_index ;
610 {
611 char *path ;
612 int len ;
613
614 switch (smc->mib.fddiSMTCF_State) {
615 default :
616 case SC0_ISOLATED :
617 path = smc->s.sas ? path_iso_s : path_iso ;
618 len = smc->s.sas ? sizeof(path_iso_s) : sizeof(path_iso) ;
619 break ;
620 case SC9_C_WRAP_A :
621 path = path_wrap_a ;
622 len = sizeof(path_wrap_a) ;
623 break ;
624 case SC10_C_WRAP_B :
625 path = path_wrap_b ;
626 len = sizeof(path_wrap_b) ;
627 break ;
628 case SC4_THRU_A :
629 path = path_thru ;
630 len = sizeof(path_thru) ;
631 break ;
632 case SC11_C_WRAP_S :
633 path = path_wrap_s ;
634 len = sizeof(path_wrap_s) ;
635 break ;
636 }
637 memcpy(to,path,len) ;
638
639 LINT_USE(path_index);
640
641 return(len) ;
642 }
643