git.oblomov.eu Git - linux-2.6/blob - drivers/net/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\n",0,0) ;
 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\n",0,0);
 150                  return(fs) ;
 151         }
 152
 153         DB_ESSN(2,"fc %x        ft %x\n",sm->smt_class,sm->smt_type) ;
 154         DB_ESSN(2,"ver %x       tran %lx\n",sm->smt_version,sm->smt_tid) ;
 155         DB_ESSN(2,"stn_id %s\n",addr_to_string(&sm->smt_source),0) ;
 156
 157         DB_ESSN(2,"infolen %x   res %x\n",sm->smt_len, msg_res_type) ;
 158         DB_ESSN(2,"sbacmd %x\n",cmd->sba_cmd,0) ;
 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 %lx\n",sm->smt_tid,0);
 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\n",0,0) ;
 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 Responce not accepted\n",0,0) ;
 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\n",payload,overhead) ;
 265
 266                 /*
 267                  * process the bandwidth allocation
 268                  */
 269                 (void)process_bw_alloc(smc,(long)payload,(long)overhead) ;
 270
 271                 return(fs) ;
 272                 /* end of Process Allocation Request */
 273
 274         /*
 275          * Process an ESS Change Request
 276          */
 277         case CHANGE_ALLOCATION :
 278                 /*
 279                  * except only replies
 280                  */
 281                 if (sm->smt_type != SMT_REQUEST) {
 282                         DB_ESS("ESS: Do not process Change Responses\n",0,0) ;
 283                         return(fs) ;
 284                 }
 285
 286                 /*
 287                  * check the para for the Change Request
 288                  */
 289                 if (smt_check_para(smc,sm,plist_raf_chg_req)) {
 290                         DB_ESS("ESS: RAF with para problem, ignoring\n",0,0) ;
 291                         return(fs) ;
 292                 }
 293
 294                 /*
 295                  * Verify the path index and resource
 296                  * type are correct. If any of
 297                  * these are false, don't process this
 298                  * change request frame.
 299                  */
 300                 if ((((struct smt_p_320b *)sm_to_para(smc,sm,SMT_P320B))->path_index
 301                         != PRIMARY_RING) || (msg_res_type != SYNC_BW)) {
 302                         DB_ESS("ESS: RAF frame with para problem, ignoring\n",0,0) ;
 303                         return(fs) ;
 304                 }
 305
 306                 /*
 307                  * Extract message queue parameters
 308                  */
 309                 p = (void *) sm_to_para(smc,sm,SMT_P320F) ;
 310                 payload = ((struct smt_p_320f *)p)->mib_payload ;
 311                 p = (void *) sm_to_para(smc,sm,SMT_P3210) ;
 312                 overhead = ((struct smt_p_3210 *)p)->mib_overhead ;
 313
 314                 DB_ESSN(2,"ESS: Change Request from %s\n",
 315                         addr_to_string(&sm->smt_source),0) ;
 316                 DB_ESSN(2,"payload= %lx overhead= %lx\n",payload,overhead) ;
 317
 318                 /*
 319                  * process the bandwidth allocation
 320                  */
 321                 if(!process_bw_alloc(smc,(long)payload,(long)overhead))
 322                         return(fs) ;
 323
 324                 /*
 325                  * send an RAF Change Reply
 326                  */
 327                 ess_send_response(smc,sm,CHANGE_ALLOCATION) ;
 328
 329                 return(fs) ;
 330                 /* end of Process Change Request */
 331
 332         /*
 333          * Process Report Response
 334          */
 335         case REPORT_ALLOCATION :
 336                 /*
 337                  * except only requests
 338                  */
 339                 if (sm->smt_type != SMT_REQUEST) {
 340                         DB_ESS("ESS: Do not process a Report Reply\n",0,0) ;
 341                         return(fs) ;
 342                 }
 343
 344                 DB_ESSN(2,"ESS: Report Request from %s\n",
 345                         addr_to_string(&(sm->smt_source)),0) ;
 346
 347                 /*
 348                  * verify that the resource type is sync bw only
 349                  */
 350                 if (msg_res_type != SYNC_BW) {
 351                         DB_ESS("ESS: ignoring RAF with para problem\n",0,0) ;
 352                         return(fs) ;
 353                 }
 354
 355                 /*
 356                  * send an RAF Change Reply
 357                  */
 358                 ess_send_response(smc,sm,REPORT_ALLOCATION) ;
 359
 360                 return(fs) ;
 361                 /* end of Process Report Request */
 362
 363         default:
 364                 /*
 365                  * error in frame
 366                  */
 367                 DB_ESS("ESS: ignoring RAF with bad sba_cmd\n",0,0) ;
 368                 break ;
 369         }
 370
 371         return(fs) ;
 372 }
 373
 374 /*
 375  * determines the synchronous bandwidth, set the TSYNC register and the
 376  * mib variables SBAPayload, SBAOverhead and fddiMACT-NEG.
 377  */
 378 static int process_bw_alloc(struct s_smc *smc, long int payload, long int overhead)
 379 {
 380         /*
 381          * determine the synchronous bandwidth (sync_bw) in bytes per T-NEG,
 382          * if the payload is greater than zero.
 383          * For the SBAPayload and the SBAOverhead we have the following
 384          * unite quations
 385          *                    _           _
 386          *                   |       bytes |
 387          *      SBAPayload = | 8000 ------ |
 388          *                   |          s  |
 389          *                    -           -
 390          *                     _       _
 391          *                    |  bytes  |
 392          *      SBAOverhead = | ------  |
 393          *                    |  T-NEG  |
 394          *                     -       -
 395          *
 396          * T-NEG is discribed by the equation:
 397          *
 398          *                   (-) fddiMACT-NEG
 399          *      T-NEG =     -------------------
 400          *                      12500000 1/s
 401          *
 402          * The number of bytes we are able to send is the payload
 403          * plus the overhead.
 404          *
 405          *                        bytes    T-NEG SBAPayload 8000 bytes/s
 406          * sync_bw =  SBAOverhead ------ + -----------------------------
 407          *                        T-NEG         T-NEG
 408          *
 409          *
 410          *                           1
 411          * sync_bw =  SBAOverhead + ---- (-)fddiMACT-NEG * SBAPayload
 412          *                          1562
 413          *
 414          */
 415
 416         /*
 417          * set the mib attributes fddiPATHSbaOverhead, fddiPATHSbaPayload
 418          */
 419 /*      if (smt_set_obj(smc,SMT_P320F,payload,S_SET)) {
 420                 DB_ESS("ESS: SMT does not accept the payload value\n",0,0) ;
 421                 return(FALSE) ;
 422         }
 423         if (smt_set_obj(smc,SMT_P3210,overhead,S_SET)) {
 424                 DB_ESS("ESS: SMT does not accept the overhead value\n",0,0) ;
 425                 return(FALSE) ;
 426         } */
 427
 428         /* premliminary */
 429         if (payload > MAX_PAYLOAD || overhead > 5000) {
 430                 DB_ESS("ESS: payload / overhead not accepted\n",0,0) ;
 431                 return(FALSE) ;
 432         }
 433
 434         /*
 435          * start the iterative allocation process if the payload or the overhead
 436          * are smaller than the parsed values
 437          */
 438         if (smc->mib.fddiESSPayload &&
 439                 ((u_long)payload != smc->mib.fddiESSPayload ||
 440                 (u_long)overhead != smc->mib.fddiESSOverhead)) {
 441                 smc->ess.raf_act_timer_poll = TRUE ;
 442                 smc->ess.timer_count = 0 ;
 443         }
 444
 445         /*
 446          * evulate the Payload
 447          */
 448         if (payload) {
 449                 DB_ESSN(2,"ESS: turn SMT_ST_SYNC_SERVICE bit on\n",0,0) ;
 450                 smc->ess.sync_bw_available = TRUE ;
 451
 452                 smc->ess.sync_bw = overhead -
 453                         (long)smc->mib.m[MAC0].fddiMACT_Neg *
 454                         payload / 1562 ;
 455         }
 456         else {
 457                 DB_ESSN(2,"ESS: turn SMT_ST_SYNC_SERVICE bit off\n",0,0) ;
 458                 smc->ess.sync_bw_available = FALSE ;
 459                 smc->ess.sync_bw = 0 ;
 460                 overhead = 0 ;
 461         }
 462
 463         smc->mib.a[PATH0].fddiPATHSbaPayload = payload ;
 464         smc->mib.a[PATH0].fddiPATHSbaOverhead = overhead ;
 465
 466
 467         DB_ESSN(2,"tsync = %lx\n",smc->ess.sync_bw,0) ;
 468
 469         ess_config_fifo(smc) ;
 470         set_formac_tsync(smc,smc->ess.sync_bw) ;
 471         return(TRUE) ;
 472 }
 473
 474 static void ess_send_response(struct s_smc *smc, struct smt_header *sm,
 475                               int sba_cmd)
 476 {
 477         struct smt_sba_chg      *chg ;
 478         SMbuf                   *mb ;
 479         void                    *p ;
 480
 481         /*
 482          * get and initialize the responce frame
 483          */
 484         if (sba_cmd == CHANGE_ALLOCATION) {
 485                 if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REPLY,
 486                                 sizeof(struct smt_sba_chg))))
 487                                 return ;
 488         }
 489         else {
 490                 if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REPLY,
 491                                 sizeof(struct smt_sba_rep_res))))
 492                                 return ;
 493         }
 494
 495         chg = smtod(mb,struct smt_sba_chg *) ;
 496         chg->smt.smt_tid = sm->smt_tid ;
 497         chg->smt.smt_dest = sm->smt_source ;
 498
 499         /* set P15 */
 500         chg->s_type.para.p_type = SMT_P0015 ;
 501         chg->s_type.para.p_len = sizeof(struct smt_p_0015) - PARA_LEN ;
 502         chg->s_type.res_type = SYNC_BW ;
 503
 504         /* set P16 */
 505         chg->cmd.para.p_type = SMT_P0016 ;
 506         chg->cmd.para.p_len = sizeof(struct smt_p_0016) - PARA_LEN ;
 507         chg->cmd.sba_cmd = sba_cmd ;
 508
 509         /* set P320B */
 510         chg->path.para.p_type = SMT_P320B ;
 511         chg->path.para.p_len = sizeof(struct smt_p_320b) - PARA_LEN ;
 512         chg->path.mib_index = SBAPATHINDEX ;
 513         chg->path.path_pad = (u_short)NULL ;
 514         chg->path.path_index = PRIMARY_RING ;
 515
 516         /* set P320F */
 517         chg->payload.para.p_type = SMT_P320F ;
 518         chg->payload.para.p_len = sizeof(struct smt_p_320f) - PARA_LEN ;
 519         chg->payload.mib_index = SBAPATHINDEX ;
 520         chg->payload.mib_payload = smc->mib.a[PATH0].fddiPATHSbaPayload ;
 521
 522         /* set P3210 */
 523         chg->overhead.para.p_type = SMT_P3210 ;
 524         chg->overhead.para.p_len = sizeof(struct smt_p_3210) - PARA_LEN ;
 525         chg->overhead.mib_index = SBAPATHINDEX ;
 526         chg->overhead.mib_overhead = smc->mib.a[PATH0].fddiPATHSbaOverhead ;
 527
 528         if (sba_cmd == CHANGE_ALLOCATION) {
 529                 /* set P1A */
 530                 chg->cat.para.p_type = SMT_P001A ;
 531                 chg->cat.para.p_len = sizeof(struct smt_p_001a) - PARA_LEN ;
 532                 p = (void *) sm_to_para(smc,sm,SMT_P001A) ;
 533                 chg->cat.category = ((struct smt_p_001a *)p)->category ;
 534         }
 535         dump_smt(smc,(struct smt_header *)chg,"RAF") ;
 536         ess_send_frame(smc,mb) ;
 537 }
 538
 539 void ess_timer_poll(struct s_smc *smc)
 540 {
 541         if (!smc->ess.raf_act_timer_poll)
 542                 return ;
 543
 544         DB_ESSN(2,"ESS: timer_poll\n",0,0) ;
 545
 546         smc->ess.timer_count++ ;
 547         if (smc->ess.timer_count == 10) {
 548                 smc->ess.timer_count = 0 ;
 549                 ess_send_alc_req(smc) ;
 550         }
 551 }
 552
 553 static void ess_send_alc_req(struct s_smc *smc)
 554 {
 555         struct smt_sba_alc_req *req ;
 556         SMbuf   *mb ;
 557
 558         /*
 559          * send never allocation request where the requested payload and
 560          * overhead is zero or deallocate bandwidht when no bandwidth is
 561          * parsed
 562          */
 563         if (!smc->mib.fddiESSPayload) {
 564                 smc->mib.fddiESSOverhead = 0 ;
 565         }
 566         else {
 567                 if (!smc->mib.fddiESSOverhead)
 568                         smc->mib.fddiESSOverhead = DEFAULT_OV ;
 569         }
 570
 571         if (smc->mib.fddiESSOverhead ==
 572                 smc->mib.a[PATH0].fddiPATHSbaOverhead &&
 573                 smc->mib.fddiESSPayload ==
 574                 smc->mib.a[PATH0].fddiPATHSbaPayload){
 575                 smc->ess.raf_act_timer_poll = FALSE ;
 576                 smc->ess.timer_count = 7 ;      /* next RAF alc req after 3 s */
 577                 return ;
 578         }
 579
 580         /*
 581          * get and initialize the responce frame
 582          */
 583         if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REQUEST,
 584                         sizeof(struct smt_sba_alc_req))))
 585                         return ;
 586         req = smtod(mb,struct smt_sba_alc_req *) ;
 587         req->smt.smt_tid = smc->ess.alloc_trans_id = smt_get_tid(smc) ;
 588         req->smt.smt_dest = smt_sba_da ;
 589
 590         /* set P15 */
 591         req->s_type.para.p_type = SMT_P0015 ;
 592         req->s_type.para.p_len = sizeof(struct smt_p_0015) - PARA_LEN ;
 593         req->s_type.res_type = SYNC_BW ;
 594
 595         /* set P16 */
 596         req->cmd.para.p_type = SMT_P0016 ;
 597         req->cmd.para.p_len = sizeof(struct smt_p_0016) - PARA_LEN ;
 598         req->cmd.sba_cmd = REQUEST_ALLOCATION ;
 599
 600         /*
 601          * set the parameter type and parameter length of all used
 602          * parameters
 603          */
 604
 605         /* set P320B */
 606         req->path.para.p_type = SMT_P320B ;
 607         req->path.para.p_len = sizeof(struct smt_p_320b) - PARA_LEN ;
 608         req->path.mib_index = SBAPATHINDEX ;
 609         req->path.path_pad = (u_short)NULL ;
 610         req->path.path_index = PRIMARY_RING ;
 611
 612         /* set P0017 */
 613         req->pl_req.para.p_type = SMT_P0017 ;
 614         req->pl_req.para.p_len = sizeof(struct smt_p_0017) - PARA_LEN ;
 615         req->pl_req.sba_pl_req = smc->mib.fddiESSPayload -
 616                 smc->mib.a[PATH0].fddiPATHSbaPayload ;
 617
 618         /* set P0018 */
 619         req->ov_req.para.p_type = SMT_P0018 ;
 620         req->ov_req.para.p_len = sizeof(struct smt_p_0018) - PARA_LEN ;
 621         req->ov_req.sba_ov_req = smc->mib.fddiESSOverhead -
 622                 smc->mib.a[PATH0].fddiPATHSbaOverhead ;
 623
 624         /* set P320F */
 625         req->payload.para.p_type = SMT_P320F ;
 626         req->payload.para.p_len = sizeof(struct smt_p_320f) - PARA_LEN ;
 627         req->payload.mib_index = SBAPATHINDEX ;
 628         req->payload.mib_payload = smc->mib.a[PATH0].fddiPATHSbaPayload ;
 629
 630         /* set P3210 */
 631         req->overhead.para.p_type = SMT_P3210 ;
 632         req->overhead.para.p_len = sizeof(struct smt_p_3210) - PARA_LEN ;
 633         req->overhead.mib_index = SBAPATHINDEX ;
 634         req->overhead.mib_overhead = smc->mib.a[PATH0].fddiPATHSbaOverhead ;
 635
 636         /* set P19 */
 637         req->a_addr.para.p_type = SMT_P0019 ;
 638         req->a_addr.para.p_len = sizeof(struct smt_p_0019) - PARA_LEN ;
 639         req->a_addr.sba_pad = (u_short)NULL ;
 640         req->a_addr.alloc_addr = null_addr ;
 641
 642         /* set P1A */
 643         req->cat.para.p_type = SMT_P001A ;
 644         req->cat.para.p_len = sizeof(struct smt_p_001a) - PARA_LEN ;
 645         req->cat.category = smc->mib.fddiESSCategory ;
 646
 647         /* set P1B */
 648         req->tneg.para.p_type = SMT_P001B ;
 649         req->tneg.para.p_len = sizeof(struct smt_p_001b) - PARA_LEN ;
 650         req->tneg.max_t_neg = smc->mib.fddiESSMaxTNeg ;
 651
 652         /* set P1C */
 653         req->segm.para.p_type = SMT_P001C ;
 654         req->segm.para.p_len = sizeof(struct smt_p_001c) - PARA_LEN ;
 655         req->segm.min_seg_siz = smc->mib.fddiESSMinSegmentSize ;
 656
 657         dump_smt(smc,(struct smt_header *)req,"RAF") ;
 658         ess_send_frame(smc,mb) ;
 659 }
 660
 661 static void ess_send_frame(struct s_smc *smc, SMbuf *mb)
 662 {
 663         /*
 664          * check if the frame must be send to the own ESS
 665          */
 666         if (smc->ess.local_sba_active) {
 667                 /*
 668                  * Send the Change Reply to the local SBA
 669                  */
 670                 DB_ESS("ESS:Send to the local SBA\n",0,0) ;
 671                 if (!smc->ess.sba_reply_pend)
 672                         smc->ess.sba_reply_pend = mb ;
 673                 else {
 674                         DB_ESS("Frame is lost - another frame was pending\n",0,0);
 675                         smt_free_mbuf(smc,mb) ;
 676                 }
 677         }
 678         else {
 679                 /*
 680                  * Send the SBA RAF Change Reply to the network
 681                  */
 682                 DB_ESS("ESS:Send to the network\n",0,0) ;
 683                 smt_send_frame(smc,mb,FC_SMT_INFO,0) ;
 684         }
 685 }
 686
 687 void ess_para_change(struct s_smc *smc)
 688 {
 689         (void)process_bw_alloc(smc,(long)smc->mib.a[PATH0].fddiPATHSbaPayload,
 690                 (long)smc->mib.a[PATH0].fddiPATHSbaOverhead) ;
 691 }
 692
 693 static void ess_config_fifo(struct s_smc *smc)
 694 {
 695         /*
 696          * if nothing to do exit
 697          */
 698         if (smc->mib.a[PATH0].fddiPATHSbaPayload) {
 699                 if (smc->hw.fp.fifo.fifo_config_mode & SYNC_TRAFFIC_ON &&
 700                         (smc->hw.fp.fifo.fifo_config_mode&SEND_ASYNC_AS_SYNC) ==
 701                         smc->mib.fddiESSSynchTxMode) {
 702                         return ;
 703                 }
 704         }
 705         else {
 706                 if (!(smc->hw.fp.fifo.fifo_config_mode & SYNC_TRAFFIC_ON)) {
 707                         return ;
 708                 }
 709         }
 710
 711         /*
 712          * split up the FIFO and reinitialize the queues
 713          */
 714         formac_reinit_tx(smc) ;
 715 }
 716
 717 #endif /* ESS */
 718
 719 #endif  /* no SLIM_SMT */
 720