kernel/drivers/net/fddi/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 }