drivers/net/fddi/skfp/ess.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  * *******************************************************************
  19  * This SBA code implements the Synchronous Bandwidth Allocation
  20  * functions described in the "FDDI Synchronous Forum Implementer's
  21  * Agreement" dated December 1th, 1993.
  22  * *******************************************************************
  23  *
  24  *      PURPOSE: The purpose of this function is to control
  25  *               synchronous allocations on a single FDDI segment.
  26  *               Allocations are limited to the primary FDDI ring.
  27  *               The SBM provides recovery mechanisms to recover
  28  *               unused bandwidth also resolves T_Neg and
  29  *               reconfiguration changes. Many of the SBM state
  30  *               machine inputs are sourced by the underlying
  31  *               FDDI sub-system supporting the SBA application.
  32  *
  33  * *******************************************************************
  34  */
  35
  36 #include "h/types.h"
  37 #include "h/fddi.h"
  38 #include "h/smc.h"
  39 #include "h/smt_p.h"
  40
  41
  42 #ifndef SLIM_SMT
  43
  44 #ifdef ESS
  45
  46 #ifndef lint
  47 static const char ID_sccs[] = "@(#)ess.c        1.10 96/02/23 (C) SK" ;
  48 #define LINT_USE(x)
  49 #else
  50 #define LINT_USE(x)     (x)=(x)
  51 #endif
  52 #define MS2BCLK(x)      ((x)*12500L)
  53
  54 /*
  55         -------------------------------------------------------------
  56         LOCAL VARIABLES:
  57         -------------------------------------------------------------
  58 */
  59
  60 static const u_short plist_raf_alc_res[] = { SMT_P0012, SMT_P320B, SMT_P320F,
  61                                         SMT_P3210, SMT_P0019, SMT_P001A,
  62                                         SMT_P001D, 0 } ;
  63
  64 static const u_short plist_raf_chg_req[] = { SMT_P320B, SMT_P320F, SMT_P3210,
  65                                         SMT_P001A, 0 } ;
  66
  67 static const struct fddi_addr smt_sba_da = {{0x80,0x01,0x43,0x00,0x80,0x0C}} ;
  68 static const struct fddi_addr null_addr = {{0,0,0,0,0,0}} ;
  69
  70 /*
  71         -------------------------------------------------------------
  72         GLOBAL VARIABLES:
  73         -------------------------------------------------------------
  74 */
  75
  76
  77 /*
  78         -------------------------------------------------------------
  79         LOCAL FUNCTIONS:
  80         -------------------------------------------------------------
  81 */
  82
  83 static void ess_send_response(struct s_smc *smc, struct smt_header *sm,
  84                               int sba_cmd);
  85 static void ess_config_fifo(struct s_smc *smc);
  86 static void ess_send_alc_req(struct s_smc *smc);
  87 static void ess_send_frame(struct s_smc *smc, SMbuf *mb);
  88
  89 /*
  90         -------------------------------------------------------------
  91         EXTERNAL FUNCTIONS:
  92         -------------------------------------------------------------
  93 */
  94
  95 /*
  96         -------------------------------------------------------------
  97         PUBLIC FUNCTIONS:
  98         -------------------------------------------------------------
  99 */
 100
 101 void ess_timer_poll(struct s_smc *smc);
 102 void ess_para_change(struct s_smc *smc);
 103 int ess_raf_received_pack(struct s_smc *smc, SMbuf *mb, struct smt_header *sm,
 104                           int fs);
 105 static int process_bw_alloc(struct s_smc *smc, long int payload, long int overhead);
 106
 107
 108 /*
 109  * --------------------------------------------------------------------------
 110  *      End Station Support     (ESS)
 111  * --------------------------------------------------------------------------
 112  */
 113
 114 /*
 115  * evaluate the RAF frame
 116  */
 117 int ess_raf_received_pack(struct s_smc *smc, SMbuf *mb, struct smt_header *sm,
 118                           int fs)
 119 {
 120         void                    *p ;            /* universal pointer */
 121         struct smt_p_0016       *cmd ;          /* para: command for the ESS */
 122         SMbuf                   *db ;
 123         u_long                  msg_res_type ;  /* recource type */
 124         u_long                  payload, overhead ;
 125         int                     local ;
 126         int                     i ;
 127
 128         /*
 129          * Message Processing Code
 130          */
 131          local = ((fs & L_INDICATOR) != 0) ;
 132
 133         /*
 134          * get the resource type
 135          */
 136         if (!(p = (void *) sm_to_para(smc,sm,SMT_P0015))) {
 137                 DB_ESS("ESS: RAF frame error, parameter type not found");
 138                 return fs;
 139         }
 140         msg_res_type = ((struct smt_p_0015 *)p)->res_type ;
 141
 142         /*
 143          * get the pointer to the ESS command
 144          */
 145         if (!(cmd = (struct smt_p_0016 *) sm_to_para(smc,sm,SMT_P0016))) {
 146                 /*
 147                  * error in frame: para ESS command was not found
 148                  */
 149                  DB_ESS("ESS: RAF frame error, parameter command not found");
 150                  return fs;
 151         }
 152
 153         DB_ESSN(2, "fc %x       ft %x", sm->smt_class, sm->smt_type);
 154         DB_ESSN(2, "ver %x      tran %x", sm->smt_version, sm->smt_tid);
 155         DB_ESSN(2, "stn_id %s", addr_to_string(&sm->smt_source));
 156
 157         DB_ESSN(2, "infolen %x  res %lx", sm->smt_len, msg_res_type);
 158         DB_ESSN(2, "sbacmd %x", cmd->sba_cmd);
 159
 160         /*
 161          * evaluate the ESS command
 162          */
 163         switch (cmd->sba_cmd) {
 164
 165         /*
 166          * Process an ESS Allocation Request
 167          */
 168         case REQUEST_ALLOCATION :
 169                 /*
 170                  * check for an RAF Request (Allocation Request)
 171                  */
 172                 if (sm->smt_type == SMT_REQUEST) {
 173                         /*
 174                          * process the Allocation request only if the frame is
 175                          * local and no static allocation is used
 176                          */
 177                         if (!local || smc->mib.fddiESSPayload)
 178                                 return fs;
 179
 180                         p = (void *) sm_to_para(smc,sm,SMT_P0019)  ;
 181                         for (i = 0; i < 5; i++) {
 182                                 if (((struct smt_p_0019 *)p)->alloc_addr.a[i]) {
 183                                         return fs;
 184                                 }
 185                         }
 186
 187                         /*
 188                          * Note: The Application should send a LAN_LOC_FRAME.
 189                          *       The ESS do not send the Frame to the network!
 190                          */
 191                         smc->ess.alloc_trans_id = sm->smt_tid ;
 192                         DB_ESS("ESS: save Alloc Req Trans ID %x", sm->smt_tid);
 193                         p = (void *) sm_to_para(smc,sm,SMT_P320F) ;
 194                         ((struct smt_p_320f *)p)->mib_payload =
 195                                 smc->mib.a[PATH0].fddiPATHSbaPayload ;
 196                         p = (void *) sm_to_para(smc,sm,SMT_P3210) ;
 197                         ((struct smt_p_3210 *)p)->mib_overhead =
 198                                 smc->mib.a[PATH0].fddiPATHSbaOverhead ;
 199                         sm->smt_dest = smt_sba_da ;
 200
 201                         if (smc->ess.local_sba_active)
 202                                 return fs | I_INDICATOR;
 203
 204                         if (!(db = smt_get_mbuf(smc)))
 205                                 return fs;
 206
 207                         db->sm_len = mb->sm_len ;
 208                         db->sm_off = mb->sm_off ;
 209                         memcpy(((char *)(db->sm_data+db->sm_off)),(char *)sm,
 210                                 (int)db->sm_len) ;
 211                         dump_smt(smc,
 212                                 (struct smt_header *)(db->sm_data+db->sm_off),
 213                                 "RAF") ;
 214                         smt_send_frame(smc,db,FC_SMT_INFO,0) ;
 215                         return fs;
 216                 }
 217
 218                 /*
 219                  * The RAF frame is an Allocation Response !
 220                  * check the parameters
 221                  */
 222                 if (smt_check_para(smc,sm,plist_raf_alc_res)) {
 223                         DB_ESS("ESS: RAF with para problem, ignoring");
 224                         return fs;
 225                 }
 226
 227                 /*
 228                  * VERIFY THE FRAME IS WELL BUILT:
 229                  *
 230                  *      1. path index = primary ring only
 231                  *      2. resource type = sync bw only
 232                  *      3. trans action id = alloc_trans_id
 233                  *      4. reason code = success
 234                  *
 235                  * If any are violated, discard the RAF frame
 236                  */
 237                 if ((((struct smt_p_320b *)sm_to_para(smc,sm,SMT_P320B))->path_index
 238                         != PRIMARY_RING) ||
 239                         (msg_res_type != SYNC_BW) ||
 240                 (((struct smt_p_reason *)sm_to_para(smc,sm,SMT_P0012))->rdf_reason
 241                         != SMT_RDF_SUCCESS) ||
 242                         (sm->smt_tid != smc->ess.alloc_trans_id)) {
 243
 244                         DB_ESS("ESS: Allocation Response not accepted");
 245                         return fs;
 246                 }
 247
 248                 /*
 249                  * Extract message parameters
 250                  */
 251                 p = (void *) sm_to_para(smc,sm,SMT_P320F) ;
 252                 if (!p) {
 253                         printk(KERN_ERR "ESS: sm_to_para failed");
 254                         return fs;
 255                 }
 256                 payload = ((struct smt_p_320f *)p)->mib_payload ;
 257                 p = (void *) sm_to_para(smc,sm,SMT_P3210) ;
 258                 if (!p) {
 259                         printk(KERN_ERR "ESS: sm_to_para failed");
 260                         return fs;
 261                 }
 262                 overhead = ((struct smt_p_3210 *)p)->mib_overhead ;
 263
 264                 DB_ESSN(2, "payload= %lx        overhead= %lx",
 265                         payload, overhead);
 266
 267                 /*
 268                  * process the bandwidth allocation
 269                  */
 270                 (void)process_bw_alloc(smc,(long)payload,(long)overhead) ;
 271
 272                 return fs;
 273                 /* end of Process Allocation Request */
 274
 275         /*
 276          * Process an ESS Change Request
 277          */
 278         case CHANGE_ALLOCATION :
 279                 /*
 280                  * except only replies
 281                  */
 282                 if (sm->smt_type != SMT_REQUEST) {
 283                         DB_ESS("ESS: Do not process Change Responses");
 284                         return fs;
 285                 }
 286
 287                 /*
 288                  * check the para for the Change Request
 289                  */
 290                 if (smt_check_para(smc,sm,plist_raf_chg_req)) {
 291                         DB_ESS("ESS: RAF with para problem, ignoring");
 292                         return fs;
 293                 }
 294
 295                 /*
 296                  * Verify the path index and resource
 297                  * type are correct. If any of
 298                  * these are false, don't process this
 299                  * change request frame.
 300                  */
 301                 if ((((struct smt_p_320b *)sm_to_para(smc,sm,SMT_P320B))->path_index
 302                         != PRIMARY_RING) || (msg_res_type != SYNC_BW)) {
 303                         DB_ESS("ESS: RAF frame with para problem, ignoring");
 304                         return fs;
 305                 }
 306
 307                 /*
 308                  * Extract message queue parameters
 309                  */
 310                 p = (void *) sm_to_para(smc,sm,SMT_P320F) ;
 311                 payload = ((struct smt_p_320f *)p)->mib_payload ;
 312                 p = (void *) sm_to_para(smc,sm,SMT_P3210) ;
 313                 overhead = ((struct smt_p_3210 *)p)->mib_overhead ;
 314
 315                 DB_ESSN(2, "ESS: Change Request from %s",
 316                         addr_to_string(&sm->smt_source));
 317                 DB_ESSN(2, "payload= %lx        overhead= %lx",
 318                         payload, overhead);
 319
 320                 /*
 321                  * process the bandwidth allocation
 322                  */
 323                 if(!process_bw_alloc(smc,(long)payload,(long)overhead))
 324                         return fs;
 325
 326                 /*
 327                  * send an RAF Change Reply
 328                  */
 329                 ess_send_response(smc,sm,CHANGE_ALLOCATION) ;
 330
 331                 return fs;
 332                 /* end of Process Change Request */
 333
 334         /*
 335          * Process Report Response
 336          */
 337         case REPORT_ALLOCATION :
 338                 /*
 339                  * except only requests
 340                  */
 341                 if (sm->smt_type != SMT_REQUEST) {
 342                         DB_ESS("ESS: Do not process a Report Reply");
 343                         return fs;
 344                 }
 345
 346                 DB_ESSN(2, "ESS: Report Request from %s",
 347                         addr_to_string(&sm->smt_source));
 348
 349                 /*
 350                  * verify that the resource type is sync bw only
 351                  */
 352                 if (msg_res_type != SYNC_BW) {
 353                         DB_ESS("ESS: ignoring RAF with para problem");
 354                         return fs;
 355                 }
 356
 357                 /*
 358                  * send an RAF Change Reply
 359                  */
 360                 ess_send_response(smc,sm,REPORT_ALLOCATION) ;
 361
 362                 return fs;
 363                 /* end of Process Report Request */
 364
 365         default:
 366                 /*
 367                  * error in frame
 368                  */
 369                 DB_ESS("ESS: ignoring RAF with bad sba_cmd");
 370                 break ;
 371         }
 372
 373         return fs;
 374 }
 375
 376 /*
 377  * determines the synchronous bandwidth, set the TSYNC register and the
 378  * mib variables SBAPayload, SBAOverhead and fddiMACT-NEG.
 379  */
 380 static int process_bw_alloc(struct s_smc *smc, long int payload, long int overhead)
 381 {
 382         /*
 383          * determine the synchronous bandwidth (sync_bw) in bytes per T-NEG,
 384          * if the payload is greater than zero.
 385          * For the SBAPayload and the SBAOverhead we have the following
 386          * unite quations
 387          *                    _           _
 388          *                   |       bytes |
 389          *      SBAPayload = | 8000 ------ |
 390          *                   |          s  |
 391          *                    -           -
 392          *                     _       _
 393          *                    |  bytes  |
 394          *      SBAOverhead = | ------  |
 395          *                    |  T-NEG  |
 396          *                     -       -
 397          *
 398          * T-NEG is described by the equation:
 399          *
 400          *                   (-) fddiMACT-NEG
 401          *      T-NEG =     -------------------
 402          *                      12500000 1/s
 403          *
 404          * The number of bytes we are able to send is the payload
 405          * plus the overhead.
 406          *
 407          *                        bytes    T-NEG SBAPayload 8000 bytes/s
 408          * sync_bw =  SBAOverhead ------ + -----------------------------
 409          *                        T-NEG         T-NEG
 410          *
 411          *
 412          *                           1
 413          * sync_bw =  SBAOverhead + ---- (-)fddiMACT-NEG * SBAPayload
 414          *                          1562
 415          *
 416          */
 417
 418         /*
 419          * set the mib attributes fddiPATHSbaOverhead, fddiPATHSbaPayload
 420          */
 421 /*      if (smt_set_obj(smc,SMT_P320F,payload,S_SET)) {
 422                 DB_ESS("ESS: SMT does not accept the payload value");
 423                 return FALSE;
 424         }
 425         if (smt_set_obj(smc,SMT_P3210,overhead,S_SET)) {
 426                 DB_ESS("ESS: SMT does not accept the overhead value");
 427                 return FALSE;
 428         } */
 429
 430         /* premliminary */
 431         if (payload > MAX_PAYLOAD || overhead > 5000) {
 432                 DB_ESS("ESS: payload / overhead not accepted");
 433                 return FALSE;
 434         }
 435
 436         /*
 437          * start the iterative allocation process if the payload or the overhead
 438          * are smaller than the parsed values
 439          */
 440         if (smc->mib.fddiESSPayload &&
 441                 ((u_long)payload != smc->mib.fddiESSPayload ||
 442                 (u_long)overhead != smc->mib.fddiESSOverhead)) {
 443                 smc->ess.raf_act_timer_poll = TRUE ;
 444                 smc->ess.timer_count = 0 ;
 445         }
 446
 447         /*
 448          * evulate the Payload
 449          */
 450         if (payload) {
 451                 DB_ESSN(2, "ESS: turn SMT_ST_SYNC_SERVICE bit on");
 452                 smc->ess.sync_bw_available = TRUE ;
 453
 454                 smc->ess.sync_bw = overhead -
 455                         (long)smc->mib.m[MAC0].fddiMACT_Neg *
 456                         payload / 1562 ;
 457         }
 458         else {
 459                 DB_ESSN(2, "ESS: turn SMT_ST_SYNC_SERVICE bit off");
 460                 smc->ess.sync_bw_available = FALSE ;
 461                 smc->ess.sync_bw = 0 ;
 462                 overhead = 0 ;
 463         }
 464
 465         smc->mib.a[PATH0].fddiPATHSbaPayload = payload ;
 466         smc->mib.a[PATH0].fddiPATHSbaOverhead = overhead ;
 467
 468
 469         DB_ESSN(2, "tsync = %lx", smc->ess.sync_bw);
 470
 471         ess_config_fifo(smc) ;
 472         set_formac_tsync(smc,smc->ess.sync_bw) ;
 473         return TRUE;
 474 }
 475
 476 static void ess_send_response(struct s_smc *smc, struct smt_header *sm,
 477                               int sba_cmd)
 478 {
 479         struct smt_sba_chg      *chg ;
 480         SMbuf                   *mb ;
 481         void                    *p ;
 482
 483         /*
 484          * get and initialize the response frame
 485          */
 486         if (sba_cmd == CHANGE_ALLOCATION) {
 487                 if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REPLY,
 488                                 sizeof(struct smt_sba_chg))))
 489                                 return ;
 490         }
 491         else {
 492                 if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REPLY,
 493                                 sizeof(struct smt_sba_rep_res))))
 494                                 return ;
 495         }
 496
 497         chg = smtod(mb,struct smt_sba_chg *) ;
 498         chg->smt.smt_tid = sm->smt_tid ;
 499         chg->smt.smt_dest = sm->smt_source ;
 500
 501         /* set P15 */
 502         chg->s_type.para.p_type = SMT_P0015 ;
 503         chg->s_type.para.p_len = sizeof(struct smt_p_0015) - PARA_LEN ;
 504         chg->s_type.res_type = SYNC_BW ;
 505
 506         /* set P16 */
 507         chg->cmd.para.p_type = SMT_P0016 ;
 508         chg->cmd.para.p_len = sizeof(struct smt_p_0016) - PARA_LEN ;
 509         chg->cmd.sba_cmd = sba_cmd ;
 510
 511         /* set P320B */
 512         chg->path.para.p_type = SMT_P320B ;
 513         chg->path.para.p_len = sizeof(struct smt_p_320b) - PARA_LEN ;
 514         chg->path.mib_index = SBAPATHINDEX ;
 515         chg->path.path_pad = 0;
 516         chg->path.path_index = PRIMARY_RING ;
 517
 518         /* set P320F */
 519         chg->payload.para.p_type = SMT_P320F ;
 520         chg->payload.para.p_len = sizeof(struct smt_p_320f) - PARA_LEN ;
 521         chg->payload.mib_index = SBAPATHINDEX ;
 522         chg->payload.mib_payload = smc->mib.a[PATH0].fddiPATHSbaPayload ;
 523
 524         /* set P3210 */
 525         chg->overhead.para.p_type = SMT_P3210 ;
 526         chg->overhead.para.p_len = sizeof(struct smt_p_3210) - PARA_LEN ;
 527         chg->overhead.mib_index = SBAPATHINDEX ;
 528         chg->overhead.mib_overhead = smc->mib.a[PATH0].fddiPATHSbaOverhead ;
 529
 530         if (sba_cmd == CHANGE_ALLOCATION) {
 531                 /* set P1A */
 532                 chg->cat.para.p_type = SMT_P001A ;
 533                 chg->cat.para.p_len = sizeof(struct smt_p_001a) - PARA_LEN ;
 534                 p = (void *) sm_to_para(smc,sm,SMT_P001A) ;
 535                 chg->cat.category = ((struct smt_p_001a *)p)->category ;
 536         }
 537         dump_smt(smc,(struct smt_header *)chg,"RAF") ;
 538         ess_send_frame(smc,mb) ;
 539 }
 540
 541 void ess_timer_poll(struct s_smc *smc)
 542 {
 543         if (!smc->ess.raf_act_timer_poll)
 544                 return ;
 545
 546         DB_ESSN(2, "ESS: timer_poll");
 547
 548         smc->ess.timer_count++ ;
 549         if (smc->ess.timer_count == 10) {
 550                 smc->ess.timer_count = 0 ;
 551                 ess_send_alc_req(smc) ;
 552         }
 553 }
 554
 555 static void ess_send_alc_req(struct s_smc *smc)
 556 {
 557         struct smt_sba_alc_req *req ;
 558         SMbuf   *mb ;
 559
 560         /*
 561          * send never allocation request where the requested payload and
 562          * overhead is zero or deallocate bandwidth when no bandwidth is
 563          * parsed
 564          */
 565         if (!smc->mib.fddiESSPayload) {
 566                 smc->mib.fddiESSOverhead = 0 ;
 567         }
 568         else {
 569                 if (!smc->mib.fddiESSOverhead)
 570                         smc->mib.fddiESSOverhead = DEFAULT_OV ;
 571         }
 572
 573         if (smc->mib.fddiESSOverhead ==
 574                 smc->mib.a[PATH0].fddiPATHSbaOverhead &&
 575                 smc->mib.fddiESSPayload ==
 576                 smc->mib.a[PATH0].fddiPATHSbaPayload){
 577                 smc->ess.raf_act_timer_poll = FALSE ;
 578                 smc->ess.timer_count = 7 ;      /* next RAF alc req after 3 s */
 579                 return ;
 580         }
 581
 582         /*
 583          * get and initialize the response frame
 584          */
 585         if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REQUEST,
 586                         sizeof(struct smt_sba_alc_req))))
 587                         return ;
 588         req = smtod(mb,struct smt_sba_alc_req *) ;
 589         req->smt.smt_tid = smc->ess.alloc_trans_id = smt_get_tid(smc) ;
 590         req->smt.smt_dest = smt_sba_da ;
 591
 592         /* set P15 */
 593         req->s_type.para.p_type = SMT_P0015 ;
 594         req->s_type.para.p_len = sizeof(struct smt_p_0015) - PARA_LEN ;
 595         req->s_type.res_type = SYNC_BW ;
 596
 597         /* set P16 */
 598         req->cmd.para.p_type = SMT_P0016 ;
 599         req->cmd.para.p_len = sizeof(struct smt_p_0016) - PARA_LEN ;
 600         req->cmd.sba_cmd = REQUEST_ALLOCATION ;
 601
 602         /*
 603          * set the parameter type and parameter length of all used
 604          * parameters
 605          */
 606
 607         /* set P320B */
 608         req->path.para.p_type = SMT_P320B ;
 609         req->path.para.p_len = sizeof(struct smt_p_320b) - PARA_LEN ;
 610         req->path.mib_index = SBAPATHINDEX ;
 611         req->path.path_pad = 0;
 612         req->path.path_index = PRIMARY_RING ;
 613
 614         /* set P0017 */
 615         req->pl_req.para.p_type = SMT_P0017 ;
 616         req->pl_req.para.p_len = sizeof(struct smt_p_0017) - PARA_LEN ;
 617         req->pl_req.sba_pl_req = smc->mib.fddiESSPayload -
 618                 smc->mib.a[PATH0].fddiPATHSbaPayload ;
 619
 620         /* set P0018 */
 621         req->ov_req.para.p_type = SMT_P0018 ;
 622         req->ov_req.para.p_len = sizeof(struct smt_p_0018) - PARA_LEN ;
 623         req->ov_req.sba_ov_req = smc->mib.fddiESSOverhead -
 624                 smc->mib.a[PATH0].fddiPATHSbaOverhead ;
 625
 626         /* set P320F */
 627         req->payload.para.p_type = SMT_P320F ;
 628         req->payload.para.p_len = sizeof(struct smt_p_320f) - PARA_LEN ;
 629         req->payload.mib_index = SBAPATHINDEX ;
 630         req->payload.mib_payload = smc->mib.a[PATH0].fddiPATHSbaPayload ;
 631
 632         /* set P3210 */
 633         req->overhead.para.p_type = SMT_P3210 ;
 634         req->overhead.para.p_len = sizeof(struct smt_p_3210) - PARA_LEN ;
 635         req->overhead.mib_index = SBAPATHINDEX ;
 636         req->overhead.mib_overhead = smc->mib.a[PATH0].fddiPATHSbaOverhead ;
 637
 638         /* set P19 */
 639         req->a_addr.para.p_type = SMT_P0019 ;
 640         req->a_addr.para.p_len = sizeof(struct smt_p_0019) - PARA_LEN ;
 641         req->a_addr.sba_pad = 0;
 642         req->a_addr.alloc_addr = null_addr ;
 643
 644         /* set P1A */
 645         req->cat.para.p_type = SMT_P001A ;
 646         req->cat.para.p_len = sizeof(struct smt_p_001a) - PARA_LEN ;
 647         req->cat.category = smc->mib.fddiESSCategory ;
 648
 649         /* set P1B */
 650         req->tneg.para.p_type = SMT_P001B ;
 651         req->tneg.para.p_len = sizeof(struct smt_p_001b) - PARA_LEN ;
 652         req->tneg.max_t_neg = smc->mib.fddiESSMaxTNeg ;
 653
 654         /* set P1C */
 655         req->segm.para.p_type = SMT_P001C ;
 656         req->segm.para.p_len = sizeof(struct smt_p_001c) - PARA_LEN ;
 657         req->segm.min_seg_siz = smc->mib.fddiESSMinSegmentSize ;
 658
 659         dump_smt(smc,(struct smt_header *)req,"RAF") ;
 660         ess_send_frame(smc,mb) ;
 661 }
 662
 663 static void ess_send_frame(struct s_smc *smc, SMbuf *mb)
 664 {
 665         /*
 666          * check if the frame must be send to the own ESS
 667          */
 668         if (smc->ess.local_sba_active) {
 669                 /*
 670                  * Send the Change Reply to the local SBA
 671                  */
 672                 DB_ESS("ESS:Send to the local SBA");
 673                 if (!smc->ess.sba_reply_pend)
 674                         smc->ess.sba_reply_pend = mb ;
 675                 else {
 676                         DB_ESS("Frame is lost - another frame was pending");
 677                         smt_free_mbuf(smc,mb) ;
 678                 }
 679         }
 680         else {
 681                 /*
 682                  * Send the SBA RAF Change Reply to the network
 683                  */
 684                 DB_ESS("ESS:Send to the network");
 685                 smt_send_frame(smc,mb,FC_SMT_INFO,0) ;
 686         }
 687 }
 688
 689 void ess_para_change(struct s_smc *smc)
 690 {
 691         (void)process_bw_alloc(smc,(long)smc->mib.a[PATH0].fddiPATHSbaPayload,
 692                 (long)smc->mib.a[PATH0].fddiPATHSbaOverhead) ;
 693 }
 694
 695 static void ess_config_fifo(struct s_smc *smc)
 696 {
 697         /*
 698          * if nothing to do exit
 699          */
 700         if (smc->mib.a[PATH0].fddiPATHSbaPayload) {
 701                 if (smc->hw.fp.fifo.fifo_config_mode & SYNC_TRAFFIC_ON &&
 702                         (smc->hw.fp.fifo.fifo_config_mode&SEND_ASYNC_AS_SYNC) ==
 703                         smc->mib.fddiESSSynchTxMode) {
 704                         return ;
 705                 }
 706         }
 707         else {
 708                 if (!(smc->hw.fp.fifo.fifo_config_mode & SYNC_TRAFFIC_ON)) {
 709                         return ;
 710                 }
 711         }
 712
 713         /*
 714          * split up the FIFO and reinitialize the queues
 715          */
 716         formac_reinit_tx(smc) ;
 717 }
 718
 719 #endif /* ESS */
 720
 721 #endif  /* no SLIM_SMT */
 722