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  */
ess_raf_received_pack(struct s_smc * smc,SMbuf * mb,struct smt_header * sm,int fs)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  */
process_bw_alloc(struct s_smc * smc,long int payload,long int overhead)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 
ess_send_response(struct s_smc * smc,struct smt_header * sm,int sba_cmd)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 
ess_timer_poll(struct s_smc * smc)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 
ess_send_alc_req(struct s_smc * smc)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 
ess_send_frame(struct s_smc * smc,SMbuf * mb)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 
ess_para_change(struct s_smc * smc)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 
ess_config_fifo(struct s_smc * smc)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 
718