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Merge tag 'for-linus-20190706' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / net / fddi / skfp / srf.c
blobf98d060b0f5b0c072ec40033da0fdb80fc6096bc
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
30 static const char ID_sccs[] = "@(#)srf.c 1.18 97/08/04 (C) SK " ;
31 #endif
32
33
34 /*
35 * function declarations
36 */
37 static void clear_all_rep(struct s_smc *smc);
38 static void clear_reported(struct s_smc *smc);
39 static void smt_send_srf(struct s_smc *smc);
40 static 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
44 struct evc_init {
45 u_char code ;
46 u_char index ;
47 u_char n ;
48 u_short para ;
49 } ;
50
51 static 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
68 void 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
157 static 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
172 static 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
181 void 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
329 static 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
342 static 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 */
365 static 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
Linux with added FPC-III support