xref: /kernel/linux/linux-5.10/drivers/net/fddi/skfp/srf.c (revision 8c2ecf20) 
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	SMT 7.2 Status Response Frame Implementation
15	SRF state machine and frame generation
16*/
17
18#include "h/types.h"
19#include "h/fddi.h"
20#include "h/smc.h"
21#include "h/smt_p.h"
22
23#define KERNEL
24#include "h/smtstate.h"
25
26#ifndef	SLIM_SMT
27#ifndef	BOOT
28
29#ifndef	lint
30static const char ID_sccs[] = "@(#)srf.c	1.18 97/08/04 (C) SK " ;
31#endif
32
33
34/*
35 * function declarations
36 */
37static void clear_all_rep(struct s_smc *smc);
38static void clear_reported(struct s_smc *smc);
39static void smt_send_srf(struct s_smc *smc);
40static struct s_srf_evc *smt_get_evc(struct s_smc *smc, int code, int index);
41
42#define MAX_EVCS	ARRAY_SIZE(smc->evcs)
43
44struct evc_init {
45	u_char code ;
46	u_char index ;
47	u_char n ;
48	u_short	para ;
49}  ;
50
51static const struct evc_init evc_inits[] = {
52	{ SMT_COND_SMT_PEER_WRAP,		0,1,SMT_P1048	} ,
53
54	{ SMT_COND_MAC_DUP_ADDR,		INDEX_MAC, NUMMACS,SMT_P208C } ,
55	{ SMT_COND_MAC_FRAME_ERROR,		INDEX_MAC, NUMMACS,SMT_P208D } ,
56	{ SMT_COND_MAC_NOT_COPIED,		INDEX_MAC, NUMMACS,SMT_P208E } ,
57	{ SMT_EVENT_MAC_NEIGHBOR_CHANGE,	INDEX_MAC, NUMMACS,SMT_P208F } ,
58	{ SMT_EVENT_MAC_PATH_CHANGE,		INDEX_MAC, NUMMACS,SMT_P2090 } ,
59
60	{ SMT_COND_PORT_LER,			INDEX_PORT,NUMPHYS,SMT_P4050 } ,
61	{ SMT_COND_PORT_EB_ERROR,		INDEX_PORT,NUMPHYS,SMT_P4052 } ,
62	{ SMT_EVENT_PORT_CONNECTION,		INDEX_PORT,NUMPHYS,SMT_P4051 } ,
63	{ SMT_EVENT_PORT_PATH_CHANGE,		INDEX_PORT,NUMPHYS,SMT_P4053 } ,
64} ;
65
66#define MAX_INIT_EVC	ARRAY_SIZE(evc_inits)
67
68void smt_init_evc(struct s_smc *smc)
69{
70	struct s_srf_evc	*evc ;
71	const struct evc_init 	*init ;
72	unsigned int		i ;
73	int			index ;
74	int			offset ;
75
76	static u_char		fail_safe = FALSE ;
77
78	memset((char *)smc->evcs,0,sizeof(smc->evcs)) ;
79
80	evc = smc->evcs ;
81	init = evc_inits ;
82
83	for (i = 0 ; i < MAX_INIT_EVC ; i++) {
84		for (index = 0 ; index < init->n ; index++) {
85			evc->evc_code = init->code ;
86			evc->evc_para = init->para ;
87			evc->evc_index = init->index + index ;
88#ifndef	DEBUG
89			evc->evc_multiple = &fail_safe ;
90			evc->evc_cond_state = &fail_safe ;
91#endif
92			evc++ ;
93		}
94		init++ ;
95	}
96
97	if ((unsigned int) (evc - smc->evcs) > MAX_EVCS) {
98		SMT_PANIC(smc,SMT_E0127, SMT_E0127_MSG) ;
99	}
100
101	/*
102	 * conditions
103	 */
104	smc->evcs[0].evc_cond_state = &smc->mib.fddiSMTPeerWrapFlag ;
105	smc->evcs[1].evc_cond_state =
106		&smc->mib.m[MAC0].fddiMACDuplicateAddressCond ;
107	smc->evcs[2].evc_cond_state =
108		&smc->mib.m[MAC0].fddiMACFrameErrorFlag ;
109	smc->evcs[3].evc_cond_state =
110		&smc->mib.m[MAC0].fddiMACNotCopiedFlag ;
111
112	/*
113	 * events
114	 */
115	smc->evcs[4].evc_multiple = &smc->mib.m[MAC0].fddiMACMultiple_N ;
116	smc->evcs[5].evc_multiple = &smc->mib.m[MAC0].fddiMACMultiple_P ;
117
118	offset = 6 ;
119	for (i = 0 ; i < NUMPHYS ; i++) {
120		/*
121		 * conditions
122		 */
123		smc->evcs[offset + 0*NUMPHYS].evc_cond_state =
124			&smc->mib.p[i].fddiPORTLerFlag ;
125		smc->evcs[offset + 1*NUMPHYS].evc_cond_state =
126			&smc->mib.p[i].fddiPORTEB_Condition ;
127
128		/*
129		 * events
130		 */
131		smc->evcs[offset + 2*NUMPHYS].evc_multiple =
132			&smc->mib.p[i].fddiPORTMultiple_U ;
133		smc->evcs[offset + 3*NUMPHYS].evc_multiple =
134			&smc->mib.p[i].fddiPORTMultiple_P ;
135		offset++ ;
136	}
137#ifdef	DEBUG
138	for (i = 0, evc = smc->evcs ; i < MAX_EVCS ; i++, evc++) {
139		if (SMT_IS_CONDITION(evc->evc_code)) {
140			if (!evc->evc_cond_state) {
141				SMT_PANIC(smc,SMT_E0128, SMT_E0128_MSG) ;
142			}
143			evc->evc_multiple = &fail_safe ;
144		}
145		else {
146			if (!evc->evc_multiple) {
147				SMT_PANIC(smc,SMT_E0129, SMT_E0129_MSG) ;
148			}
149			evc->evc_cond_state = &fail_safe ;
150		}
151	}
152#endif
153	smc->srf.TSR = smt_get_time() ;
154	smc->srf.sr_state = SR0_WAIT ;
155}
156
157static struct s_srf_evc *smt_get_evc(struct s_smc *smc, int code, int index)
158{
159	unsigned int		i ;
160	struct s_srf_evc	*evc ;
161
162	for (i = 0, evc = smc->evcs ; i < MAX_EVCS ; i++, evc++) {
163		if (evc->evc_code == code && evc->evc_index == index)
164			return evc;
165	}
166	return NULL;
167}
168
169#define THRESHOLD_2	(2*TICKS_PER_SECOND)
170#define THRESHOLD_32	(32*TICKS_PER_SECOND)
171
172static const char * const srf_names[] = {
173	"None","MACPathChangeEvent",	"MACNeighborChangeEvent",
174	"PORTPathChangeEvent",		"PORTUndesiredConnectionAttemptEvent",
175	"SMTPeerWrapCondition",		"SMTHoldCondition",
176	"MACFrameErrorCondition",	"MACDuplicateAddressCondition",
177	"MACNotCopiedCondition",	"PORTEBErrorCondition",
178	"PORTLerCondition"
179} ;
180
181void smt_srf_event(struct s_smc *smc, int code, int index, int cond)
182{
183	struct s_srf_evc	*evc ;
184	int			cond_asserted = 0 ;
185	int			cond_deasserted = 0 ;
186	int			event_occurred = 0 ;
187	int			tsr ;
188	int			T_Limit = 2*TICKS_PER_SECOND ;
189
190	if (code == SMT_COND_MAC_DUP_ADDR && cond) {
191		RS_SET(smc,RS_DUPADDR) ;
192	}
193
194	if (code) {
195		DB_SMT("SRF: %s index %d", srf_names[code], index);
196
197		if (!(evc = smt_get_evc(smc,code,index))) {
198			DB_SMT("SRF : smt_get_evc() failed");
199			return ;
200		}
201		/*
202		 * ignore condition if no change
203		 */
204		if (SMT_IS_CONDITION(code)) {
205			if (*evc->evc_cond_state == cond)
206				return ;
207		}
208
209		/*
210		 * set transition time stamp
211		 */
212		smt_set_timestamp(smc,smc->mib.fddiSMTTransitionTimeStamp) ;
213		if (SMT_IS_CONDITION(code)) {
214			DB_SMT("SRF: condition is %s", cond ? "ON" : "OFF");
215			if (cond) {
216				*evc->evc_cond_state = TRUE ;
217				evc->evc_rep_required = TRUE ;
218				smc->srf.any_report = TRUE ;
219				cond_asserted = TRUE ;
220			}
221			else {
222				*evc->evc_cond_state = FALSE ;
223				cond_deasserted = TRUE ;
224			}
225		}
226		else {
227			if (evc->evc_rep_required) {
228				*evc->evc_multiple  = TRUE ;
229			}
230			else {
231				evc->evc_rep_required = TRUE ;
232				*evc->evc_multiple  = FALSE ;
233			}
234			smc->srf.any_report = TRUE ;
235			event_occurred = TRUE ;
236		}
237#ifdef	FDDI_MIB
238		snmp_srf_event(smc,evc) ;
239#endif	/* FDDI_MIB */
240	}
241	tsr = smt_get_time() - smc->srf.TSR ;
242
243	switch (smc->srf.sr_state) {
244	case SR0_WAIT :
245		/* SR01a */
246		if (cond_asserted && tsr < T_Limit) {
247			smc->srf.SRThreshold = THRESHOLD_2 ;
248			smc->srf.sr_state = SR1_HOLDOFF ;
249			break ;
250		}
251		/* SR01b */
252		if (cond_deasserted && tsr < T_Limit) {
253			smc->srf.sr_state = SR1_HOLDOFF ;
254			break ;
255		}
256		/* SR01c */
257		if (event_occurred && tsr < T_Limit) {
258			smc->srf.sr_state = SR1_HOLDOFF ;
259			break ;
260		}
261		/* SR00b */
262		if (cond_asserted && tsr >= T_Limit) {
263			smc->srf.SRThreshold = THRESHOLD_2 ;
264			smc->srf.TSR = smt_get_time() ;
265			smt_send_srf(smc) ;
266			break ;
267		}
268		/* SR00c */
269		if (cond_deasserted && tsr >= T_Limit) {
270			smc->srf.TSR = smt_get_time() ;
271			smt_send_srf(smc) ;
272			break ;
273		}
274		/* SR00d */
275		if (event_occurred && tsr >= T_Limit) {
276			smc->srf.TSR = smt_get_time() ;
277			smt_send_srf(smc) ;
278			break ;
279		}
280		/* SR00e */
281		if (smc->srf.any_report && (u_long) tsr >=
282			smc->srf.SRThreshold) {
283			smc->srf.SRThreshold *= 2 ;
284			if (smc->srf.SRThreshold > THRESHOLD_32)
285				smc->srf.SRThreshold = THRESHOLD_32 ;
286			smc->srf.TSR = smt_get_time() ;
287			smt_send_srf(smc) ;
288			break ;
289		}
290		/* SR02 */
291		if (!smc->mib.fddiSMTStatRptPolicy) {
292			smc->srf.sr_state = SR2_DISABLED ;
293			break ;
294		}
295		break ;
296	case SR1_HOLDOFF :
297		/* SR10b */
298		if (tsr >= T_Limit) {
299			smc->srf.sr_state = SR0_WAIT ;
300			smc->srf.TSR = smt_get_time() ;
301			smt_send_srf(smc) ;
302			break ;
303		}
304		/* SR11a */
305		if (cond_asserted) {
306			smc->srf.SRThreshold = THRESHOLD_2 ;
307		}
308		/* SR11b */
309		/* SR11c */
310		/* handled above */
311		/* SR12 */
312		if (!smc->mib.fddiSMTStatRptPolicy) {
313			smc->srf.sr_state = SR2_DISABLED ;
314			break ;
315		}
316		break ;
317	case SR2_DISABLED :
318		if (smc->mib.fddiSMTStatRptPolicy) {
319			smc->srf.sr_state = SR0_WAIT ;
320			smc->srf.TSR = smt_get_time() ;
321			smc->srf.SRThreshold = THRESHOLD_2 ;
322			clear_all_rep(smc) ;
323			break ;
324		}
325		break ;
326	}
327}
328
329static void clear_all_rep(struct s_smc *smc)
330{
331	struct s_srf_evc	*evc ;
332	unsigned int		i ;
333
334	for (i = 0, evc = smc->evcs ; i < MAX_EVCS ; i++, evc++) {
335		evc->evc_rep_required = FALSE ;
336		if (SMT_IS_CONDITION(evc->evc_code))
337			*evc->evc_cond_state = FALSE ;
338	}
339	smc->srf.any_report = FALSE ;
340}
341
342static void clear_reported(struct s_smc *smc)
343{
344	struct s_srf_evc	*evc ;
345	unsigned int		i ;
346
347	smc->srf.any_report = FALSE ;
348	for (i = 0, evc = smc->evcs ; i < MAX_EVCS ; i++, evc++) {
349		if (SMT_IS_CONDITION(evc->evc_code)) {
350			if (*evc->evc_cond_state == FALSE)
351				evc->evc_rep_required = FALSE ;
352			else
353				smc->srf.any_report = TRUE ;
354		}
355		else {
356			evc->evc_rep_required = FALSE ;
357			*evc->evc_multiple = FALSE ;
358		}
359	}
360}
361
362/*
363 * build and send SMT SRF frame
364 */
365static void smt_send_srf(struct s_smc *smc)
366{
367
368	struct smt_header	*smt ;
369	struct s_srf_evc	*evc ;
370	SK_LOC_DECL(struct s_pcon,pcon) ;
371	SMbuf			*mb ;
372	unsigned int		i ;
373
374	static const struct fddi_addr SMT_SRF_DA = {
375		{ 0x80, 0x01, 0x43, 0x00, 0x80, 0x08 }
376	} ;
377
378	/*
379	 * build SMT header
380	 */
381	if (!smc->r.sm_ma_avail)
382		return ;
383	if (!(mb = smt_build_frame(smc,SMT_SRF,SMT_ANNOUNCE,0)))
384		return ;
385
386	RS_SET(smc,RS_SOFTERROR) ;
387
388	smt = smtod(mb, struct smt_header *) ;
389	smt->smt_dest = SMT_SRF_DA ;		/* DA == SRF multicast */
390
391	/*
392	 * setup parameter status
393	 */
394	pcon.pc_len = SMT_MAX_INFO_LEN ;	/* max para length */
395	pcon.pc_err = 0 ;			/* no error */
396	pcon.pc_badset = 0 ;			/* no bad set count */
397	pcon.pc_p = (void *) (smt + 1) ;	/* paras start here */
398
399	smt_add_para(smc,&pcon,(u_short) SMT_P1033,0,0) ;
400	smt_add_para(smc,&pcon,(u_short) SMT_P1034,0,0) ;
401
402	for (i = 0, evc = smc->evcs ; i < MAX_EVCS ; i++, evc++) {
403		if (evc->evc_rep_required) {
404			smt_add_para(smc,&pcon,evc->evc_para,
405				(int)evc->evc_index,0) ;
406		}
407	}
408	smt->smt_len = SMT_MAX_INFO_LEN - pcon.pc_len ;
409	mb->sm_len = smt->smt_len + sizeof(struct smt_header) ;
410
411	DB_SMT("SRF: sending SRF at %p, len %d", smt, mb->sm_len);
412	DB_SMT("SRF: state SR%d Threshold %lu",
413	       smc->srf.sr_state, smc->srf.SRThreshold / TICKS_PER_SECOND);
414#ifdef	DEBUG
415	dump_smt(smc,smt,"SRF Send") ;
416#endif
417	smt_send_frame(smc,mb,FC_SMT_INFO,0) ;
418	clear_reported(smc) ;
419}
420
421#endif	/* no BOOT */
422#endif	/* no SLIM_SMT */
423
424