Merge branch 'linus' into core/iommu
[linux-2.6] / 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 independent state machine implemantation
25  *      The following external SMT functions are referenced :
26  *
27  *              queue_event()
28  *
29  *      The following external HW dependent functions are referenced :
30  *              config_mux()
31  *
32  *      The following HW dependent 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 unsigned 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(struct s_smc *smc, int cmd);
100
101 /*
102         init CFM state machine
103         clear all CFM vars and flags
104 */
105 void cfm_init(struct s_smc *smc)
106 {
107         smc->mib.fddiSMTCF_State = ACTIONS(SC0_ISOLATED) ;
108         smc->r.rm_join = 0 ;
109         smc->r.rm_loop = 0 ;
110         smc->y[PA].scrub = 0 ;
111         smc->y[PB].scrub = 0 ;
112         smc->y[PA].cem_pst = CEM_PST_DOWN ;
113         smc->y[PB].cem_pst = CEM_PST_DOWN ;
114 }
115
116 /* Some terms conditions used by the selection criteria */
117 #define THRU_ENABLED(smc)       (smc->y[PA].pc_mode != PM_TREE && \
118                                  smc->y[PB].pc_mode != PM_TREE)
119 /* Selection criteria for the ports */
120 static void selection_criteria (struct s_smc *smc, struct s_phy *phy)
121 {
122
123         switch (phy->mib->fddiPORTMy_Type) {
124         case TA:
125                 if ( !THRU_ENABLED(smc) && smc->y[PB].cf_join ) {
126                         phy->wc_flag = TRUE ;
127                 } else {
128                         phy->wc_flag = FALSE ;
129                 }
130
131                 break;
132         case TB:
133                 /* take precedence over PA */
134                 phy->wc_flag = FALSE ;
135                 break;
136         case TS:
137                 phy->wc_flag = FALSE ;
138                 break;
139         case TM:
140                 phy->wc_flag = FALSE ;
141                 break;
142         }
143
144 }
145
146 void all_selection_criteria(struct s_smc *smc)
147 {
148         struct s_phy    *phy ;
149         int             p ;
150
151         for ( p = 0,phy = smc->y ; p < NUMPHYS; p++, phy++ ) {
152                 /* Do the selection criteria */
153                 selection_criteria (smc,phy);
154         }
155 }
156
157 static void cem_priv_state(struct s_smc *smc, int event)
158 /* State machine for private PORT states: used to optimize dual homing */
159 {
160         int     np;     /* Number of the port */
161         int     i;
162
163         /* Do this only in a DAS */
164         if (smc->s.sas != SMT_DAS )
165                 return ;
166
167         np = event - CF_JOIN;
168
169         if (np != PA && np != PB) {
170                 return ;
171         }
172         /* Change the port state according to the event (portnumber) */
173         if (smc->y[np].cf_join) {
174                 smc->y[np].cem_pst = CEM_PST_UP ;
175         } else if (!smc->y[np].wc_flag) {
176                 /* set the port to done only if it is not withheld */
177                 smc->y[np].cem_pst = CEM_PST_DOWN ;
178         }
179
180         /* Don't set an hold port to down */
181
182         /* Check all ports of restart conditions */
183         for (i = 0 ; i < 2 ; i ++ ) {
184                 /* Check all port for PORT is on hold and no withhold is done */
185                 if ( smc->y[i].cem_pst == CEM_PST_HOLD && !smc->y[i].wc_flag ) {
186                         smc->y[i].cem_pst = CEM_PST_DOWN;
187                         queue_event(smc,(int)(EVENT_PCM+i),PC_START) ;
188                 }
189                 if ( smc->y[i].cem_pst == CEM_PST_UP && smc->y[i].wc_flag ) {
190                         smc->y[i].cem_pst = CEM_PST_HOLD;
191                         queue_event(smc,(int)(EVENT_PCM+i),PC_START) ;
192                 }
193                 if ( smc->y[i].cem_pst == CEM_PST_DOWN && smc->y[i].wc_flag ) {
194                         /*
195                          * The port must be restarted when the wc_flag
196                          * will be reset. So set the port on hold.
197                          */
198                         smc->y[i].cem_pst = CEM_PST_HOLD;
199                 }
200         }
201         return ;
202 }
203
204 /*
205         CFM state machine
206         called by dispatcher
207
208         do
209                 display state change
210                 process event
211         until SM is stable
212 */
213 void cfm(struct s_smc *smc, int event)
214 {
215         int     state ;         /* remember last state */
216         int     cond ;
217         int     oldstate ;
218
219         /* We will do the following: */
220         /*  - compute the variable WC_Flag for every port (This is where */
221         /*    we can extend the requested path checking !!) */
222         /*  - do the old (SMT 6.2 like) state machine */
223         /*  - do the resulting station states */
224
225         all_selection_criteria (smc);
226
227         /* We will check now whether a state transition is allowed or not */
228         /*  - change the portstates */
229         cem_priv_state (smc, event);
230
231         oldstate = smc->mib.fddiSMTCF_State ;
232         do {
233                 DB_CFM("CFM : state %s%s",
234                         (smc->mib.fddiSMTCF_State & AFLAG) ? "ACTIONS " : "",
235                         cfm_states[smc->mib.fddiSMTCF_State & ~AFLAG]) ;
236                 DB_CFM(" event %s\n",cfm_events[event],0) ;
237                 state = smc->mib.fddiSMTCF_State ;
238                 cfm_fsm(smc,event) ;
239                 event = 0 ;
240         } while (state != smc->mib.fddiSMTCF_State) ;
241
242 #ifndef SLIM_SMT
243         /*
244          * check peer wrap condition
245          */
246         cond = FALSE ;
247         if (    (smc->mib.fddiSMTCF_State == SC9_C_WRAP_A &&
248                 smc->y[PA].pc_mode == PM_PEER)  ||
249                 (smc->mib.fddiSMTCF_State == SC10_C_WRAP_B &&
250                 smc->y[PB].pc_mode == PM_PEER)  ||
251                 (smc->mib.fddiSMTCF_State == SC11_C_WRAP_S &&
252                 smc->y[PS].pc_mode == PM_PEER &&
253                 smc->y[PS].mib->fddiPORTNeighborType != TS ) ) {
254                         cond = TRUE ;
255         }
256         if (cond != smc->mib.fddiSMTPeerWrapFlag)
257                 smt_srf_event(smc,SMT_COND_SMT_PEER_WRAP,0,cond) ;
258
259 #if     0
260         /*
261          * Don't send ever MAC_PATH_CHANGE events. Our MAC is hard-wired
262          * to the primary path.
263          */
264         /*
265          * path change
266          */
267         if (smc->mib.fddiSMTCF_State != oldstate) {
268                 smt_srf_event(smc,SMT_EVENT_MAC_PATH_CHANGE,INDEX_MAC,0) ;
269         }
270 #endif
271 #endif  /* no SLIM_SMT */
272
273         /*
274          * set MAC port type
275          */
276         smc->mib.m[MAC0].fddiMACDownstreamPORTType =
277                 cf_to_ptype[smc->mib.fddiSMTCF_State] ;
278         cfm_state_change(smc,(int)smc->mib.fddiSMTCF_State) ;
279 }
280
281 /*
282         process CFM event
283 */
284 /*ARGSUSED1*/
285 static void cfm_fsm(struct s_smc *smc, int cmd)
286 {
287         switch(smc->mib.fddiSMTCF_State) {
288         case ACTIONS(SC0_ISOLATED) :
289                 smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
290                 smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
291                 smc->mib.p[PA].fddiPORTMACPlacement = 0 ;
292                 smc->mib.p[PB].fddiPORTMACPlacement = 0 ;
293                 smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_SEPA ;
294                 config_mux(smc,MUX_ISOLATE) ;   /* configure PHY Mux */
295                 smc->r.rm_loop = FALSE ;
296                 smc->r.rm_join = FALSE ;
297                 queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
298                 /* Don't do the WC-Flag changing here */
299                 ACTIONS_DONE() ;
300                 DB_CFMN(1,"CFM : %s\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
301                 break;
302         case SC0_ISOLATED :
303                 /*SC07*/
304                 /*SAS port can be PA or PB ! */
305                 if (smc->s.sas && (smc->y[PA].cf_join || smc->y[PA].cf_loop ||
306                                 smc->y[PB].cf_join || smc->y[PB].cf_loop)) {
307                         GO_STATE(SC11_C_WRAP_S) ;
308                         break ;
309                 }
310                 /*SC01*/
311                 if ((smc->y[PA].cem_pst == CEM_PST_UP && smc->y[PA].cf_join &&
312                      !smc->y[PA].wc_flag) || smc->y[PA].cf_loop) {
313                         GO_STATE(SC9_C_WRAP_A) ;
314                         break ;
315                 }
316                 /*SC02*/
317                 if ((smc->y[PB].cem_pst == CEM_PST_UP && smc->y[PB].cf_join &&
318                      !smc->y[PB].wc_flag) || smc->y[PB].cf_loop) {
319                         GO_STATE(SC10_C_WRAP_B) ;
320                         break ;
321                 }
322                 break ;
323         case ACTIONS(SC9_C_WRAP_A) :
324                 smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_CONCATENATED ;
325                 smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
326                 smc->mib.p[PA].fddiPORTMACPlacement = INDEX_MAC ;
327                 smc->mib.p[PB].fddiPORTMACPlacement = 0 ;
328                 smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_CON ;
329                 config_mux(smc,MUX_WRAPA) ;             /* configure PHY mux */
330                 if (smc->y[PA].cf_loop) {
331                         smc->r.rm_join = FALSE ;
332                         smc->r.rm_loop = TRUE ;
333                         queue_event(smc,EVENT_RMT,RM_LOOP) ;/* signal RMT */
334                 }
335                 if (smc->y[PA].cf_join) {
336                         smc->r.rm_loop = FALSE ;
337                         smc->r.rm_join = TRUE ;
338                         queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
339                 }
340                 ACTIONS_DONE() ;
341                 DB_CFMN(1,"CFM : %s\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
342                 break ;
343         case SC9_C_WRAP_A :
344                 /*SC10*/
345                 if ( (smc->y[PA].wc_flag || !smc->y[PA].cf_join) &&
346                       !smc->y[PA].cf_loop ) {
347                         GO_STATE(SC0_ISOLATED) ;
348                         break ;
349                 }
350                 /*SC12*/
351                 else if ( (smc->y[PB].cf_loop && smc->y[PA].cf_join &&
352                            smc->y[PA].cem_pst == CEM_PST_UP) ||
353                           ((smc->y[PB].cf_loop ||
354                            (smc->y[PB].cf_join &&
355                             smc->y[PB].cem_pst == CEM_PST_UP)) &&
356                             (smc->y[PA].pc_mode == PM_TREE ||
357                              smc->y[PB].pc_mode == PM_TREE))) {
358                         smc->y[PA].scrub = TRUE ;
359                         GO_STATE(SC10_C_WRAP_B) ;
360                         break ;
361                 }
362                 /*SC14*/
363                 else if (!smc->s.attach_s &&
364                           smc->y[PA].cf_join &&
365                           smc->y[PA].cem_pst == CEM_PST_UP &&
366                           smc->y[PA].pc_mode == PM_PEER && smc->y[PB].cf_join &&
367                           smc->y[PB].cem_pst == CEM_PST_UP &&
368                           smc->y[PB].pc_mode == PM_PEER) {
369                         smc->y[PA].scrub = TRUE ;
370                         smc->y[PB].scrub = TRUE ;
371                         GO_STATE(SC4_THRU_A) ;
372                         break ;
373                 }
374                 /*SC15*/
375                 else if ( smc->s.attach_s &&
376                           smc->y[PA].cf_join &&
377                           smc->y[PA].cem_pst == CEM_PST_UP &&
378                           smc->y[PA].pc_mode == PM_PEER &&
379                           smc->y[PB].cf_join &&
380                           smc->y[PB].cem_pst == CEM_PST_UP &&
381                           smc->y[PB].pc_mode == PM_PEER) {
382                         smc->y[PA].scrub = TRUE ;
383                         smc->y[PB].scrub = TRUE ;
384                         GO_STATE(SC5_THRU_B) ;
385                         break ;
386                 }
387                 break ;
388         case ACTIONS(SC10_C_WRAP_B) :
389                 smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
390                 smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_CONCATENATED ;
391                 smc->mib.p[PA].fddiPORTMACPlacement = 0 ;
392                 smc->mib.p[PB].fddiPORTMACPlacement = INDEX_MAC ;
393                 smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_CON ;
394                 config_mux(smc,MUX_WRAPB) ;             /* configure PHY mux */
395                 if (smc->y[PB].cf_loop) {
396                         smc->r.rm_join = FALSE ;
397                         smc->r.rm_loop = TRUE ;
398                         queue_event(smc,EVENT_RMT,RM_LOOP) ;/* signal RMT */
399                 }
400                 if (smc->y[PB].cf_join) {
401                         smc->r.rm_loop = FALSE ;
402                         smc->r.rm_join = TRUE ;
403                         queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
404                 }
405                 ACTIONS_DONE() ;
406                 DB_CFMN(1,"CFM : %s\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
407                 break ;
408         case SC10_C_WRAP_B :
409                 /*SC20*/
410                 if ( !smc->y[PB].cf_join && !smc->y[PB].cf_loop ) {
411                         GO_STATE(SC0_ISOLATED) ;
412                         break ;
413                 }
414                 /*SC21*/
415                 else if ( smc->y[PA].cf_loop && smc->y[PA].pc_mode == PM_PEER &&
416                           smc->y[PB].cf_join && smc->y[PB].pc_mode == PM_PEER) {
417                         smc->y[PB].scrub = TRUE ;
418                         GO_STATE(SC9_C_WRAP_A) ;
419                         break ;
420                 }
421                 /*SC24*/
422                 else if (!smc->s.attach_s &&
423                          smc->y[PA].cf_join && smc->y[PA].pc_mode == PM_PEER &&
424                          smc->y[PB].cf_join && smc->y[PB].pc_mode == PM_PEER) {
425                         smc->y[PA].scrub = TRUE ;
426                         smc->y[PB].scrub = TRUE ;
427                         GO_STATE(SC4_THRU_A) ;
428                         break ;
429                 }
430                 /*SC25*/
431                 else if ( smc->s.attach_s &&
432                          smc->y[PA].cf_join && smc->y[PA].pc_mode == PM_PEER &&
433                          smc->y[PB].cf_join && smc->y[PB].pc_mode == PM_PEER) {
434                         smc->y[PA].scrub = TRUE ;
435                         smc->y[PB].scrub = TRUE ;
436                         GO_STATE(SC5_THRU_B) ;
437                         break ;
438                 }
439                 break ;
440         case ACTIONS(SC4_THRU_A) :
441                 smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_THRU ;
442                 smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_THRU ;
443                 smc->mib.p[PA].fddiPORTMACPlacement = 0 ;
444                 smc->mib.p[PB].fddiPORTMACPlacement = INDEX_MAC ;
445                 smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_THRU ;
446                 config_mux(smc,MUX_THRUA) ;             /* configure PHY mux */
447                 smc->r.rm_loop = FALSE ;
448                 smc->r.rm_join = TRUE ;
449                 queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
450                 ACTIONS_DONE() ;
451                 DB_CFMN(1,"CFM : %s\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
452                 break ;
453         case SC4_THRU_A :
454                 /*SC41*/
455                 if (smc->y[PB].wc_flag || !smc->y[PB].cf_join) {
456                         smc->y[PA].scrub = TRUE ;
457                         GO_STATE(SC9_C_WRAP_A) ;
458                         break ;
459                 }
460                 /*SC42*/
461                 else if (!smc->y[PA].cf_join || smc->y[PA].wc_flag) {
462                         smc->y[PB].scrub = TRUE ;
463                         GO_STATE(SC10_C_WRAP_B) ;
464                         break ;
465                 }
466                 /*SC45*/
467                 else if (smc->s.attach_s) {
468                         smc->y[PB].scrub = TRUE ;
469                         GO_STATE(SC5_THRU_B) ;
470                         break ;
471                 }
472                 break ;
473         case ACTIONS(SC5_THRU_B) :
474                 smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_THRU ;
475                 smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_THRU ;
476                 smc->mib.p[PA].fddiPORTMACPlacement = INDEX_MAC ;
477                 smc->mib.p[PB].fddiPORTMACPlacement = 0 ;
478                 smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_THRU ;
479                 config_mux(smc,MUX_THRUB) ;             /* configure PHY mux */
480                 smc->r.rm_loop = FALSE ;
481                 smc->r.rm_join = TRUE ;
482                 queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
483                 ACTIONS_DONE() ;
484                 DB_CFMN(1,"CFM : %s\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
485                 break ;
486         case SC5_THRU_B :
487                 /*SC51*/
488                 if (!smc->y[PB].cf_join || smc->y[PB].wc_flag) {
489                         smc->y[PA].scrub = TRUE ;
490                         GO_STATE(SC9_C_WRAP_A) ;
491                         break ;
492                 }
493                 /*SC52*/
494                 else if (!smc->y[PA].cf_join || smc->y[PA].wc_flag) {
495                         smc->y[PB].scrub = TRUE ;
496                         GO_STATE(SC10_C_WRAP_B) ;
497                         break ;
498                 }
499                 /*SC54*/
500                 else if (!smc->s.attach_s) {
501                         smc->y[PA].scrub = TRUE ;
502                         GO_STATE(SC4_THRU_A) ;
503                         break ;
504                 }
505                 break ;
506         case ACTIONS(SC11_C_WRAP_S) :
507                 smc->mib.p[PS].fddiPORTCurrentPath = MIB_PATH_CONCATENATED ;
508                 smc->mib.p[PS].fddiPORTMACPlacement = INDEX_MAC ;
509                 smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_CON ;
510                 config_mux(smc,MUX_WRAPS) ;             /* configure PHY mux */
511                 if (smc->y[PA].cf_loop || smc->y[PB].cf_loop) {
512                         smc->r.rm_join = FALSE ;
513                         smc->r.rm_loop = TRUE ;
514                         queue_event(smc,EVENT_RMT,RM_LOOP) ;/* signal RMT */
515                 }
516                 if (smc->y[PA].cf_join || smc->y[PB].cf_join) {
517                         smc->r.rm_loop = FALSE ;
518                         smc->r.rm_join = TRUE ;
519                         queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
520                 }
521                 ACTIONS_DONE() ;
522                 DB_CFMN(1,"CFM : %s\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
523                 break ;
524         case SC11_C_WRAP_S :
525                 /*SC70*/
526                 if ( !smc->y[PA].cf_join && !smc->y[PA].cf_loop &&
527                      !smc->y[PB].cf_join && !smc->y[PB].cf_loop) {
528                         GO_STATE(SC0_ISOLATED) ;
529                         break ;
530                 }
531                 break ;
532         default:
533                 SMT_PANIC(smc,SMT_E0106, SMT_E0106_MSG) ;
534                 break;
535         }
536 }
537
538 /*
539  * get MAC's input Port
540  *      return :
541  *              PA or PB
542  */
543 int cfm_get_mac_input(struct s_smc *smc)
544 {
545         return((smc->mib.fddiSMTCF_State == SC10_C_WRAP_B ||
546                 smc->mib.fddiSMTCF_State == SC5_THRU_B) ? PB : PA) ;
547 }
548
549 /*
550  * get MAC's output Port
551  *      return :
552  *              PA or PB
553  */
554 int cfm_get_mac_output(struct s_smc *smc)
555 {
556         return((smc->mib.fddiSMTCF_State == SC10_C_WRAP_B ||
557                 smc->mib.fddiSMTCF_State == SC4_THRU_A) ? PB : PA) ;
558 }
559
560 static char path_iso[] = {
561         0,0,    0,RES_PORT,     0,PA + INDEX_PORT,      0,PATH_ISO,
562         0,0,    0,RES_MAC,      0,INDEX_MAC,            0,PATH_ISO,
563         0,0,    0,RES_PORT,     0,PB + INDEX_PORT,      0,PATH_ISO
564 } ;
565
566 static char path_wrap_a[] = {
567         0,0,    0,RES_PORT,     0,PA + INDEX_PORT,      0,PATH_PRIM,
568         0,0,    0,RES_MAC,      0,INDEX_MAC,            0,PATH_PRIM,
569         0,0,    0,RES_PORT,     0,PB + INDEX_PORT,      0,PATH_ISO
570 } ;
571
572 static char path_wrap_b[] = {
573         0,0,    0,RES_PORT,     0,PB + INDEX_PORT,      0,PATH_PRIM,
574         0,0,    0,RES_MAC,      0,INDEX_MAC,            0,PATH_PRIM,
575         0,0,    0,RES_PORT,     0,PA + INDEX_PORT,      0,PATH_ISO
576 } ;
577
578 static char path_thru[] = {
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_PRIM
582 } ;
583
584 static char path_wrap_s[] = {
585         0,0,    0,RES_PORT,     0,PS + INDEX_PORT,      0,PATH_PRIM,
586         0,0,    0,RES_MAC,      0,INDEX_MAC,            0,PATH_PRIM,
587 } ;
588
589 static char path_iso_s[] = {
590         0,0,    0,RES_PORT,     0,PS + INDEX_PORT,      0,PATH_ISO,
591         0,0,    0,RES_MAC,      0,INDEX_MAC,            0,PATH_ISO,
592 } ;
593
594 int cem_build_path(struct s_smc *smc, char *to, int path_index)
595 {
596         char    *path ;
597         int     len ;
598
599         switch (smc->mib.fddiSMTCF_State) {
600         default :
601         case SC0_ISOLATED :
602                 path = smc->s.sas ? path_iso_s : path_iso ;
603                 len = smc->s.sas ? sizeof(path_iso_s) :  sizeof(path_iso) ;
604                 break ;
605         case SC9_C_WRAP_A :
606                 path = path_wrap_a ;
607                 len = sizeof(path_wrap_a) ;
608                 break ;
609         case SC10_C_WRAP_B :
610                 path = path_wrap_b ;
611                 len = sizeof(path_wrap_b) ;
612                 break ;
613         case SC4_THRU_A :
614                 path = path_thru ;
615                 len = sizeof(path_thru) ;
616                 break ;
617         case SC11_C_WRAP_S :
618                 path = path_wrap_s ;
619                 len = sizeof(path_wrap_s) ;
620                 break ;
621         }
622         memcpy(to,path,len) ;
623
624         LINT_USE(path_index);
625
626         return(len) ;
627 }