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