fddi/skfp/ess.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /******************************************************************************
   3  *
   4  *      (C)Copyright 1998,1999 SysKonnect,
   5  *      a business unit of Schneider & Koch & Co. Datensysteme GmbH.
   6  *
   7  *      See the file "skfddi.c" for further information.
   8  *
   9  *      The information in this file is provided "AS IS" without warranty.
  10  *
  11  ******************************************************************************/
  12
  13 /*
  14  * *******************************************************************
  15  * This SBA code implements the Synchronous Bandwidth Allocation
  16  * functions described in the "FDDI Synchronous Forum Implementer's
  17  * Agreement" dated December 1th, 1993.
  18  * *******************************************************************
  19  *
  20  *      PURPOSE: The purpose of this function is to control
  21  *               synchronous allocations on a single FDDI segment.
  22  *               Allocations are limited to the primary FDDI ring.
  23  *               The SBM provides recovery mechanisms to recover
  24  *               unused bandwidth also resolves T_Neg and
  25  *               reconfiguration changes. Many of the SBM state
  26  *               machine inputs are sourced by the underlying
  27  *               FDDI sub-system supporting the SBA application.
  28  *
  29  * *******************************************************************
  30  */
  31
  32 #include "h/types.h"
  33 #include "h/fddi.h"
  34 #include "h/smc.h"
  35 #include "h/smt_p.h"
  36
  37
  38 #ifndef SLIM_SMT
  39
  40 #ifdef ESS
  41
  42 #ifndef lint
  43 #define LINT_USE(x)
  44 #else
  45 #define LINT_USE(x)     (x)=(x)
  46 #endif
  47 #define MS2BCLK(x)      ((x)*12500L)
  48
  49 /*
  50         -------------------------------------------------------------
  51         LOCAL VARIABLES:
  52         -------------------------------------------------------------
  53 */
  54
  55 static const u_short plist_raf_alc_res[] = { SMT_P0012, SMT_P320B, SMT_P320F,
  56                                         SMT_P3210, SMT_P0019, SMT_P001A,
  57                                         SMT_P001D, 0 } ;
  58
  59 static const u_short plist_raf_chg_req[] = { SMT_P320B, SMT_P320F, SMT_P3210,
  60                                         SMT_P001A, 0 } ;
  61
  62 static const struct fddi_addr smt_sba_da = {{0x80,0x01,0x43,0x00,0x80,0x0C}} ;
  63 static const struct fddi_addr null_addr = {{0,0,0,0,0,0}} ;
  64
  65 /*
  66         -------------------------------------------------------------
  67         GLOBAL VARIABLES:
  68         -------------------------------------------------------------
  69 */
  70
  71
  72 /*
  73         -------------------------------------------------------------
  74         LOCAL FUNCTIONS:
  75         -------------------------------------------------------------
  76 */
  77
  78 static void ess_send_response(struct s_smc *smc, struct smt_header *sm,
  79                               int sba_cmd);
  80 static void ess_config_fifo(struct s_smc *smc);
  81 static void ess_send_alc_req(struct s_smc *smc);
  82 static void ess_send_frame(struct s_smc *smc, SMbuf *mb);
  83
  84 /*
  85         -------------------------------------------------------------
  86         EXTERNAL FUNCTIONS:
  87         -------------------------------------------------------------
  88 */
  89
  90 /*
  91         -------------------------------------------------------------
  92         PUBLIC FUNCTIONS:
  93         -------------------------------------------------------------
  94 */
  95
  96 void ess_timer_poll(struct s_smc *smc);
  97 void ess_para_change(struct s_smc *smc);
  98 int ess_raf_received_pack(struct s_smc *smc, SMbuf *mb, struct smt_header *sm,
  99                           int fs);
 100 static int process_bw_alloc(struct s_smc *smc, long int payload, long int overhead);
 101
 102
 103 /*
 104  * --------------------------------------------------------------------------
 105  *      End Station Support     (ESS)
 106  * --------------------------------------------------------------------------
 107  */
 108
 109 /*
 110  * evaluate the RAF frame
 111  */
 112 int ess_raf_received_pack(struct s_smc *smc, SMbuf *mb, struct smt_header *sm,
 113                           int fs)
 114 {
 115         void                    *p ;            /* universal pointer */
 116         struct smt_p_0016       *cmd ;          /* para: command for the ESS */
 117         SMbuf                   *db ;
 118         u_long                  msg_res_type ;  /* recource type */
 119         u_long                  payload, overhead ;
 120         int                     local ;
 121         int                     i ;
 122
 123         /*
 124          * Message Processing Code
 125          */
 126          local = ((fs & L_INDICATOR) != 0) ;
 127
 128         /*
 129          * get the resource type
 130          */
 131         if (!(p = (void *) sm_to_para(smc,sm,SMT_P0015))) {
 132                 DB_ESS("ESS: RAF frame error, parameter type not found");
 133                 return fs;
 134         }
 135         msg_res_type = ((struct smt_p_0015 *)p)->res_type ;
 136
 137         /*
 138          * get the pointer to the ESS command
 139          */
 140         if (!(cmd = (struct smt_p_0016 *) sm_to_para(smc,sm,SMT_P0016))) {
 141                 /*
 142                  * error in frame: para ESS command was not found
 143                  */
 144                  DB_ESS("ESS: RAF frame error, parameter command not found");
 145                  return fs;
 146         }
 147
 148         DB_ESSN(2, "fc %x       ft %x", sm->smt_class, sm->smt_type);
 149         DB_ESSN(2, "ver %x      tran %x", sm->smt_version, sm->smt_tid);
 150         DB_ESSN(2, "stn_id %pM", &sm->smt_source);
 151
 152         DB_ESSN(2, "infolen %x  res %lx", sm->smt_len, msg_res_type);
 153         DB_ESSN(2, "sbacmd %x", cmd->sba_cmd);
 154
 155         /*
 156          * evaluate the ESS command
 157          */
 158         switch (cmd->sba_cmd) {
 159
 160         /*
 161          * Process an ESS Allocation Request
 162          */
 163         case REQUEST_ALLOCATION :
 164                 /*
 165                  * check for an RAF Request (Allocation Request)
 166                  */
 167                 if (sm->smt_type == SMT_REQUEST) {
 168                         /*
 169                          * process the Allocation request only if the frame is
 170                          * local and no static allocation is used
 171                          */
 172                         if (!local || smc->mib.fddiESSPayload)
 173                                 return fs;
 174
 175                         p = (void *) sm_to_para(smc,sm,SMT_P0019)  ;
 176                         for (i = 0; i < 5; i++) {
 177                                 if (((struct smt_p_0019 *)p)->alloc_addr.a[i]) {
 178                                         return fs;
 179                                 }
 180                         }
 181
 182                         /*
 183                          * Note: The Application should send a LAN_LOC_FRAME.
 184                          *       The ESS do not send the Frame to the network!
 185                          */
 186                         smc->ess.alloc_trans_id = sm->smt_tid ;
 187                         DB_ESS("ESS: save Alloc Req Trans ID %x", sm->smt_tid);
 188                         p = (void *) sm_to_para(smc,sm,SMT_P320F) ;
 189                         ((struct smt_p_320f *)p)->mib_payload =
 190                                 smc->mib.a[PATH0].fddiPATHSbaPayload ;
 191                         p = (void *) sm_to_para(smc,sm,SMT_P3210) ;
 192                         ((struct smt_p_3210 *)p)->mib_overhead =
 193                                 smc->mib.a[PATH0].fddiPATHSbaOverhead ;
 194                         sm->smt_dest = smt_sba_da ;
 195
 196                         if (smc->ess.local_sba_active)
 197                                 return fs | I_INDICATOR;
 198
 199                         if (!(db = smt_get_mbuf(smc)))
 200                                 return fs;
 201
 202                         db->sm_len = mb->sm_len ;
 203                         db->sm_off = mb->sm_off ;
 204                         memcpy(((char *)(db->sm_data+db->sm_off)),(char *)sm,
 205                                 (int)db->sm_len) ;
 206                         dump_smt(smc,
 207                                 (struct smt_header *)(db->sm_data+db->sm_off),
 208                                 "RAF") ;
 209                         smt_send_frame(smc,db,FC_SMT_INFO,0) ;
 210                         return fs;
 211                 }
 212
 213                 /*
 214                  * The RAF frame is an Allocation Response !
 215                  * check the parameters
 216                  */
 217                 if (smt_check_para(smc,sm,plist_raf_alc_res)) {
 218                         DB_ESS("ESS: RAF with para problem, ignoring");
 219                         return fs;
 220                 }
 221
 222                 /*
 223                  * VERIFY THE FRAME IS WELL BUILT:
 224                  *
 225                  *      1. path index = primary ring only
 226                  *      2. resource type = sync bw only
 227                  *      3. trans action id = alloc_trans_id
 228                  *      4. reason code = success
 229                  *
 230                  * If any are violated, discard the RAF frame
 231                  */
 232                 if ((((struct smt_p_320b *)sm_to_para(smc,sm,SMT_P320B))->path_index
 233                         != PRIMARY_RING) ||
 234                         (msg_res_type != SYNC_BW) ||
 235                 (((struct smt_p_reason *)sm_to_para(smc,sm,SMT_P0012))->rdf_reason
 236                         != SMT_RDF_SUCCESS) ||
 237                         (sm->smt_tid != smc->ess.alloc_trans_id)) {
 238
 239                         DB_ESS("ESS: Allocation Response not accepted");
 240                         return fs;
 241                 }
 242
 243                 /*
 244                  * Extract message parameters
 245                  */
 246                 p = (void *) sm_to_para(smc,sm,SMT_P320F) ;
 247                 if (!p) {
 248                         printk(KERN_ERR "ESS: sm_to_para failed");
 249                         return fs;
 250                 }
 251                 payload = ((struct smt_p_320f *)p)->mib_payload ;
 252                 p = (void *) sm_to_para(smc,sm,SMT_P3210) ;
 253                 if (!p) {
 254                         printk(KERN_ERR "ESS: sm_to_para failed");
 255                         return fs;
 256                 }
 257                 overhead = ((struct smt_p_3210 *)p)->mib_overhead ;
 258
 259                 DB_ESSN(2, "payload= %lx        overhead= %lx",
 260                         payload, overhead);
 261
 262                 /*
 263                  * process the bandwidth allocation
 264                  */
 265                 (void)process_bw_alloc(smc,(long)payload,(long)overhead) ;
 266
 267                 return fs;
 268                 /* end of Process Allocation Request */
 269
 270         /*
 271          * Process an ESS Change Request
 272          */
 273         case CHANGE_ALLOCATION :
 274                 /*
 275                  * except only replies
 276                  */
 277                 if (sm->smt_type != SMT_REQUEST) {
 278                         DB_ESS("ESS: Do not process Change Responses");
 279                         return fs;
 280                 }
 281
 282                 /*
 283                  * check the para for the Change Request
 284                  */
 285                 if (smt_check_para(smc,sm,plist_raf_chg_req)) {
 286                         DB_ESS("ESS: RAF with para problem, ignoring");
 287                         return fs;
 288                 }
 289
 290                 /*
 291                  * Verify the path index and resource
 292                  * type are correct. If any of
 293                  * these are false, don't process this
 294                  * change request frame.
 295                  */
 296                 if ((((struct smt_p_320b *)sm_to_para(smc,sm,SMT_P320B))->path_index
 297                         != PRIMARY_RING) || (msg_res_type != SYNC_BW)) {
 298                         DB_ESS("ESS: RAF frame with para problem, ignoring");
 299                         return fs;
 300                 }
 301
 302                 /*
 303                  * Extract message queue parameters
 304                  */
 305                 p = (void *) sm_to_para(smc,sm,SMT_P320F) ;
 306                 payload = ((struct smt_p_320f *)p)->mib_payload ;
 307                 p = (void *) sm_to_para(smc,sm,SMT_P3210) ;
 308                 overhead = ((struct smt_p_3210 *)p)->mib_overhead ;
 309
 310                 DB_ESSN(2, "ESS: Change Request from %pM",
 311                         &sm->smt_source);
 312                 DB_ESSN(2, "payload= %lx        overhead= %lx",
 313                         payload, overhead);
 314
 315                 /*
 316                  * process the bandwidth allocation
 317                  */
 318                 if(!process_bw_alloc(smc,(long)payload,(long)overhead))
 319                         return fs;
 320
 321                 /*
 322                  * send an RAF Change Reply
 323                  */
 324                 ess_send_response(smc,sm,CHANGE_ALLOCATION) ;
 325
 326                 return fs;
 327                 /* end of Process Change Request */
 328
 329         /*
 330          * Process Report Response
 331          */
 332         case REPORT_ALLOCATION :
 333                 /*
 334                  * except only requests
 335                  */
 336                 if (sm->smt_type != SMT_REQUEST) {
 337                         DB_ESS("ESS: Do not process a Report Reply");
 338                         return fs;
 339                 }
 340
 341                 DB_ESSN(2, "ESS: Report Request from %pM",
 342                         &sm->smt_source);
 343
 344                 /*
 345                  * verify that the resource type is sync bw only
 346                  */
 347                 if (msg_res_type != SYNC_BW) {
 348                         DB_ESS("ESS: ignoring RAF with para problem");
 349                         return fs;
 350                 }
 351
 352                 /*
 353                  * send an RAF Change Reply
 354                  */
 355                 ess_send_response(smc,sm,REPORT_ALLOCATION) ;
 356
 357                 return fs;
 358                 /* end of Process Report Request */
 359
 360         default:
 361                 /*
 362                  * error in frame
 363                  */
 364                 DB_ESS("ESS: ignoring RAF with bad sba_cmd");
 365                 break ;
 366         }
 367
 368         return fs;
 369 }
 370
 371 /*
 372  * determines the synchronous bandwidth, set the TSYNC register and the
 373  * mib variables SBAPayload, SBAOverhead and fddiMACT-NEG.
 374  */
 375 static int process_bw_alloc(struct s_smc *smc, long int payload, long int overhead)
 376 {
 377         /*
 378          * determine the synchronous bandwidth (sync_bw) in bytes per T-NEG,
 379          * if the payload is greater than zero.
 380          * For the SBAPayload and the SBAOverhead we have the following
 381          * unite quations
 382          *                    _           _
 383          *                   |       bytes |
 384          *      SBAPayload = | 8000 ------ |
 385          *                   |          s  |
 386          *                    -           -
 387          *                     _       _
 388          *                    |  bytes  |
 389          *      SBAOverhead = | ------  |
 390          *                    |  T-NEG  |
 391          *                     -       -
 392          *
 393          * T-NEG is described by the equation:
 394          *
 395          *                   (-) fddiMACT-NEG
 396          *      T-NEG =     -------------------
 397          *                      12500000 1/s
 398          *
 399          * The number of bytes we are able to send is the payload
 400          * plus the overhead.
 401          *
 402          *                        bytes    T-NEG SBAPayload 8000 bytes/s
 403          * sync_bw =  SBAOverhead ------ + -----------------------------
 404          *                        T-NEG         T-NEG
 405          *
 406          *
 407          *                           1
 408          * sync_bw =  SBAOverhead + ---- (-)fddiMACT-NEG * SBAPayload
 409          *                          1562
 410          *
 411          */
 412
 413         /*
 414          * set the mib attributes fddiPATHSbaOverhead, fddiPATHSbaPayload
 415          */
 416 /*      if (smt_set_obj(smc,SMT_P320F,payload,S_SET)) {
 417                 DB_ESS("ESS: SMT does not accept the payload value");
 418                 return FALSE;
 419         }
 420         if (smt_set_obj(smc,SMT_P3210,overhead,S_SET)) {
 421                 DB_ESS("ESS: SMT does not accept the overhead value");
 422                 return FALSE;
 423         } */
 424
 425         /* premliminary */
 426         if (payload > MAX_PAYLOAD || overhead > 5000) {
 427                 DB_ESS("ESS: payload / overhead not accepted");
 428                 return FALSE;
 429         }
 430
 431         /*
 432          * start the iterative allocation process if the payload or the overhead
 433          * are smaller than the parsed values
 434          */
 435         if (smc->mib.fddiESSPayload &&
 436                 ((u_long)payload != smc->mib.fddiESSPayload ||
 437                 (u_long)overhead != smc->mib.fddiESSOverhead)) {
 438                 smc->ess.raf_act_timer_poll = TRUE ;
 439                 smc->ess.timer_count = 0 ;
 440         }
 441
 442         /*
 443          * evulate the Payload
 444          */
 445         if (payload) {
 446                 DB_ESSN(2, "ESS: turn SMT_ST_SYNC_SERVICE bit on");
 447                 smc->ess.sync_bw_available = TRUE ;
 448
 449                 smc->ess.sync_bw = overhead -
 450                         (long)smc->mib.m[MAC0].fddiMACT_Neg *
 451                         payload / 1562 ;
 452         }
 453         else {
 454                 DB_ESSN(2, "ESS: turn SMT_ST_SYNC_SERVICE bit off");
 455                 smc->ess.sync_bw_available = FALSE ;
 456                 smc->ess.sync_bw = 0 ;
 457                 overhead = 0 ;
 458         }
 459
 460         smc->mib.a[PATH0].fddiPATHSbaPayload = payload ;
 461         smc->mib.a[PATH0].fddiPATHSbaOverhead = overhead ;
 462
 463
 464         DB_ESSN(2, "tsync = %lx", smc->ess.sync_bw);
 465
 466         ess_config_fifo(smc) ;
 467         set_formac_tsync(smc,smc->ess.sync_bw) ;
 468         return TRUE;
 469 }
 470
 471 static void ess_send_response(struct s_smc *smc, struct smt_header *sm,
 472                               int sba_cmd)
 473 {
 474         struct smt_sba_chg      *chg ;
 475         SMbuf                   *mb ;
 476         void                    *p ;
 477
 478         /*
 479          * get and initialize the response frame
 480          */
 481         if (sba_cmd == CHANGE_ALLOCATION) {
 482                 if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REPLY,
 483                                 sizeof(struct smt_sba_chg))))
 484                                 return ;
 485         }
 486         else {
 487                 if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REPLY,
 488                                 sizeof(struct smt_sba_rep_res))))
 489                                 return ;
 490         }
 491
 492         chg = smtod(mb,struct smt_sba_chg *) ;
 493         chg->smt.smt_tid = sm->smt_tid ;
 494         chg->smt.smt_dest = sm->smt_source ;
 495
 496         /* set P15 */
 497         chg->s_type.para.p_type = SMT_P0015 ;
 498         chg->s_type.para.p_len = sizeof(struct smt_p_0015) - PARA_LEN ;
 499         chg->s_type.res_type = SYNC_BW ;
 500
 501         /* set P16 */
 502         chg->cmd.para.p_type = SMT_P0016 ;
 503         chg->cmd.para.p_len = sizeof(struct smt_p_0016) - PARA_LEN ;
 504         chg->cmd.sba_cmd = sba_cmd ;
 505
 506         /* set P320B */
 507         chg->path.para.p_type = SMT_P320B ;
 508         chg->path.para.p_len = sizeof(struct smt_p_320b) - PARA_LEN ;
 509         chg->path.mib_index = SBAPATHINDEX ;
 510         chg->path.path_pad = 0;
 511         chg->path.path_index = PRIMARY_RING ;
 512
 513         /* set P320F */
 514         chg->payload.para.p_type = SMT_P320F ;
 515         chg->payload.para.p_len = sizeof(struct smt_p_320f) - PARA_LEN ;
 516         chg->payload.mib_index = SBAPATHINDEX ;
 517         chg->payload.mib_payload = smc->mib.a[PATH0].fddiPATHSbaPayload ;
 518
 519         /* set P3210 */
 520         chg->overhead.para.p_type = SMT_P3210 ;
 521         chg->overhead.para.p_len = sizeof(struct smt_p_3210) - PARA_LEN ;
 522         chg->overhead.mib_index = SBAPATHINDEX ;
 523         chg->overhead.mib_overhead = smc->mib.a[PATH0].fddiPATHSbaOverhead ;
 524
 525         if (sba_cmd == CHANGE_ALLOCATION) {
 526                 /* set P1A */
 527                 chg->cat.para.p_type = SMT_P001A ;
 528                 chg->cat.para.p_len = sizeof(struct smt_p_001a) - PARA_LEN ;
 529                 p = (void *) sm_to_para(smc,sm,SMT_P001A) ;
 530                 chg->cat.category = ((struct smt_p_001a *)p)->category ;
 531         }
 532         dump_smt(smc,(struct smt_header *)chg,"RAF") ;
 533         ess_send_frame(smc,mb) ;
 534 }
 535
 536 void ess_timer_poll(struct s_smc *smc)
 537 {
 538         if (!smc->ess.raf_act_timer_poll)
 539                 return ;
 540
 541         DB_ESSN(2, "ESS: timer_poll");
 542
 543         smc->ess.timer_count++ ;
 544         if (smc->ess.timer_count == 10) {
 545                 smc->ess.timer_count = 0 ;
 546                 ess_send_alc_req(smc) ;
 547         }
 548 }
 549
 550 static void ess_send_alc_req(struct s_smc *smc)
 551 {
 552         struct smt_sba_alc_req *req ;
 553         SMbuf   *mb ;
 554
 555         /*
 556          * send never allocation request where the requested payload and
 557          * overhead is zero or deallocate bandwidth when no bandwidth is
 558          * parsed
 559          */
 560         if (!smc->mib.fddiESSPayload) {
 561                 smc->mib.fddiESSOverhead = 0 ;
 562         }
 563         else {
 564                 if (!smc->mib.fddiESSOverhead)
 565                         smc->mib.fddiESSOverhead = DEFAULT_OV ;
 566         }
 567
 568         if (smc->mib.fddiESSOverhead ==
 569                 smc->mib.a[PATH0].fddiPATHSbaOverhead &&
 570                 smc->mib.fddiESSPayload ==
 571                 smc->mib.a[PATH0].fddiPATHSbaPayload){
 572                 smc->ess.raf_act_timer_poll = FALSE ;
 573                 smc->ess.timer_count = 7 ;      /* next RAF alc req after 3 s */
 574                 return ;
 575         }
 576
 577         /*
 578          * get and initialize the response frame
 579          */
 580         if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REQUEST,
 581                         sizeof(struct smt_sba_alc_req))))
 582                         return ;
 583         req = smtod(mb,struct smt_sba_alc_req *) ;
 584         req->smt.smt_tid = smc->ess.alloc_trans_id = smt_get_tid(smc) ;
 585         req->smt.smt_dest = smt_sba_da ;
 586
 587         /* set P15 */
 588         req->s_type.para.p_type = SMT_P0015 ;
 589         req->s_type.para.p_len = sizeof(struct smt_p_0015) - PARA_LEN ;
 590         req->s_type.res_type = SYNC_BW ;
 591
 592         /* set P16 */
 593         req->cmd.para.p_type = SMT_P0016 ;
 594         req->cmd.para.p_len = sizeof(struct smt_p_0016) - PARA_LEN ;
 595         req->cmd.sba_cmd = REQUEST_ALLOCATION ;
 596
 597         /*
 598          * set the parameter type and parameter length of all used
 599          * parameters
 600          */
 601
 602         /* set P320B */
 603         req->path.para.p_type = SMT_P320B ;
 604         req->path.para.p_len = sizeof(struct smt_p_320b) - PARA_LEN ;
 605         req->path.mib_index = SBAPATHINDEX ;
 606         req->path.path_pad = 0;
 607         req->path.path_index = PRIMARY_RING ;
 608
 609         /* set P0017 */
 610         req->pl_req.para.p_type = SMT_P0017 ;
 611         req->pl_req.para.p_len = sizeof(struct smt_p_0017) - PARA_LEN ;
 612         req->pl_req.sba_pl_req = smc->mib.fddiESSPayload -
 613                 smc->mib.a[PATH0].fddiPATHSbaPayload ;
 614
 615         /* set P0018 */
 616         req->ov_req.para.p_type = SMT_P0018 ;
 617         req->ov_req.para.p_len = sizeof(struct smt_p_0018) - PARA_LEN ;
 618         req->ov_req.sba_ov_req = smc->mib.fddiESSOverhead -
 619                 smc->mib.a[PATH0].fddiPATHSbaOverhead ;
 620
 621         /* set P320F */
 622         req->payload.para.p_type = SMT_P320F ;
 623         req->payload.para.p_len = sizeof(struct smt_p_320f) - PARA_LEN ;
 624         req->payload.mib_index = SBAPATHINDEX ;
 625         req->payload.mib_payload = smc->mib.a[PATH0].fddiPATHSbaPayload ;
 626
 627         /* set P3210 */
 628         req->overhead.para.p_type = SMT_P3210 ;
 629         req->overhead.para.p_len = sizeof(struct smt_p_3210) - PARA_LEN ;
 630         req->overhead.mib_index = SBAPATHINDEX ;
 631         req->overhead.mib_overhead = smc->mib.a[PATH0].fddiPATHSbaOverhead ;
 632
 633         /* set P19 */
 634         req->a_addr.para.p_type = SMT_P0019 ;
 635         req->a_addr.para.p_len = sizeof(struct smt_p_0019) - PARA_LEN ;
 636         req->a_addr.sba_pad = 0;
 637         req->a_addr.alloc_addr = null_addr ;
 638
 639         /* set P1A */
 640         req->cat.para.p_type = SMT_P001A ;
 641         req->cat.para.p_len = sizeof(struct smt_p_001a) - PARA_LEN ;
 642         req->cat.category = smc->mib.fddiESSCategory ;
 643
 644         /* set P1B */
 645         req->tneg.para.p_type = SMT_P001B ;
 646         req->tneg.para.p_len = sizeof(struct smt_p_001b) - PARA_LEN ;
 647         req->tneg.max_t_neg = smc->mib.fddiESSMaxTNeg ;
 648
 649         /* set P1C */
 650         req->segm.para.p_type = SMT_P001C ;
 651         req->segm.para.p_len = sizeof(struct smt_p_001c) - PARA_LEN ;
 652         req->segm.min_seg_siz = smc->mib.fddiESSMinSegmentSize ;
 653
 654         dump_smt(smc,(struct smt_header *)req,"RAF") ;
 655         ess_send_frame(smc,mb) ;
 656 }
 657
 658 static void ess_send_frame(struct s_smc *smc, SMbuf *mb)
 659 {
 660         /*
 661          * check if the frame must be send to the own ESS
 662          */
 663         if (smc->ess.local_sba_active) {
 664                 /*
 665                  * Send the Change Reply to the local SBA
 666                  */
 667                 DB_ESS("ESS:Send to the local SBA");
 668                 if (!smc->ess.sba_reply_pend)
 669                         smc->ess.sba_reply_pend = mb ;
 670                 else {
 671                         DB_ESS("Frame is lost - another frame was pending");
 672                         smt_free_mbuf(smc,mb) ;
 673                 }
 674         }
 675         else {
 676                 /*
 677                  * Send the SBA RAF Change Reply to the network
 678                  */
 679                 DB_ESS("ESS:Send to the network");
 680                 smt_send_frame(smc,mb,FC_SMT_INFO,0) ;
 681         }
 682 }
 683
 684 void ess_para_change(struct s_smc *smc)
 685 {
 686         (void)process_bw_alloc(smc,(long)smc->mib.a[PATH0].fddiPATHSbaPayload,
 687                 (long)smc->mib.a[PATH0].fddiPATHSbaOverhead) ;
 688 }
 689
 690 static void ess_config_fifo(struct s_smc *smc)
 691 {
 692         /*
 693          * if nothing to do exit
 694          */
 695         if (smc->mib.a[PATH0].fddiPATHSbaPayload) {
 696                 if (smc->hw.fp.fifo.fifo_config_mode & SYNC_TRAFFIC_ON &&
 697                         (smc->hw.fp.fifo.fifo_config_mode&SEND_ASYNC_AS_SYNC) ==
 698                         smc->mib.fddiESSSynchTxMode) {
 699                         return ;
 700                 }
 701         }
 702         else {
 703                 if (!(smc->hw.fp.fifo.fifo_config_mode & SYNC_TRAFFIC_ON)) {
 704                         return ;
 705                 }
 706         }
 707
 708         /*
 709          * split up the FIFO and reinitialize the queues
 710          */
 711         formac_reinit_tx(smc) ;
 712 }
 713
 714 #endif /* ESS */
 715
 716 #endif  /* no SLIM_SMT */
 717