drivers/net: Remove unnecessary returns from void function()s
[linux-2.6.git] / 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 = 0;
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 bandwidth 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 = 0;
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 = 0;
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