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Merge branch 'for-linus' of git://git.infradead.org/users/sameo/mfd-2.6
[linux-btrfs-devel.git] / drivers / net / skfp / srf.c
blobf6f7baf9f27a7f6072c046970edb1ef38105bd9b
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 SMT 7.2 Status Response Frame Implementation
19 SRF state machine and frame generation
20 */
21
22 #include "h/types.h"
23 #include "h/fddi.h"
24 #include "h/smc.h"
25 #include "h/smt_p.h"
26
27 #define KERNEL
28 #include "h/smtstate.h"
29
30 #ifndef SLIM_SMT
31 #ifndef BOOT
32
33 #ifndef lint
34 static const char ID_sccs[] = "@(#)srf.c 1.18 97/08/04 (C) SK " ;
35 #endif
36
37
38 /*
39 * function declarations
40 */
41 static void clear_all_rep(struct s_smc *smc);
42 static void clear_reported(struct s_smc *smc);
43 static void smt_send_srf(struct s_smc *smc);
44 static struct s_srf_evc *smt_get_evc(struct s_smc *smc, int code, int index);
45
46 #define MAX_EVCS ARRAY_SIZE(smc->evcs)
47
48 struct evc_init {
49 u_char code ;
50 u_char index ;
51 u_char n ;
52 u_short para ;
53 } ;
54
55 static const struct evc_init evc_inits[] = {
56 { SMT_COND_SMT_PEER_WRAP, 0,1,SMT_P1048 } ,
57
58 { SMT_COND_MAC_DUP_ADDR, INDEX_MAC, NUMMACS,SMT_P208C } ,
59 { SMT_COND_MAC_FRAME_ERROR, INDEX_MAC, NUMMACS,SMT_P208D } ,
60 { SMT_COND_MAC_NOT_COPIED, INDEX_MAC, NUMMACS,SMT_P208E } ,
61 { SMT_EVENT_MAC_NEIGHBOR_CHANGE, INDEX_MAC, NUMMACS,SMT_P208F } ,
62 { SMT_EVENT_MAC_PATH_CHANGE, INDEX_MAC, NUMMACS,SMT_P2090 } ,
63
64 { SMT_COND_PORT_LER, INDEX_PORT,NUMPHYS,SMT_P4050 } ,
65 { SMT_COND_PORT_EB_ERROR, INDEX_PORT,NUMPHYS,SMT_P4052 } ,
66 { SMT_EVENT_PORT_CONNECTION, INDEX_PORT,NUMPHYS,SMT_P4051 } ,
67 { SMT_EVENT_PORT_PATH_CHANGE, INDEX_PORT,NUMPHYS,SMT_P4053 } ,
68 } ;
69
70 #define MAX_INIT_EVC ARRAY_SIZE(evc_inits)
71
72 void smt_init_evc(struct s_smc *smc)
73 {
74 struct s_srf_evc *evc ;
75 const struct evc_init *init ;
76 int i ;
77 int index ;
78 int offset ;
79
80 static u_char fail_safe = FALSE ;
81
82 memset((char *)smc->evcs,0,sizeof(smc->evcs)) ;
83
84 evc = smc->evcs ;
85 init = evc_inits ;
86
87 for (i = 0 ; (unsigned) i < MAX_INIT_EVC ; i++) {
88 for (index = 0 ; index < init->n ; index++) {
89 evc->evc_code = init->code ;
90 evc->evc_para = init->para ;
91 evc->evc_index = init->index + index ;
92 #ifndef DEBUG
93 evc->evc_multiple = &fail_safe ;
94 evc->evc_cond_state = &fail_safe ;
95 #endif
96 evc++ ;
97 }
98 init++ ;
99 }
100
101 if ((unsigned) (evc - smc->evcs) > MAX_EVCS) {
102 SMT_PANIC(smc,SMT_E0127, SMT_E0127_MSG) ;
103 }
104
105 /*
106 * conditions
107 */
108 smc->evcs[0].evc_cond_state = &smc->mib.fddiSMTPeerWrapFlag ;
109 smc->evcs[1].evc_cond_state =
110 &smc->mib.m[MAC0].fddiMACDuplicateAddressCond ;
111 smc->evcs[2].evc_cond_state =
112 &smc->mib.m[MAC0].fddiMACFrameErrorFlag ;
113 smc->evcs[3].evc_cond_state =
114 &smc->mib.m[MAC0].fddiMACNotCopiedFlag ;
115
116 /*
117 * events
118 */
119 smc->evcs[4].evc_multiple = &smc->mib.m[MAC0].fddiMACMultiple_N ;
120 smc->evcs[5].evc_multiple = &smc->mib.m[MAC0].fddiMACMultiple_P ;
121
122 offset = 6 ;
123 for (i = 0 ; i < NUMPHYS ; i++) {
124 /*
125 * conditions
126 */
127 smc->evcs[offset + 0*NUMPHYS].evc_cond_state =
128 &smc->mib.p[i].fddiPORTLerFlag ;
129 smc->evcs[offset + 1*NUMPHYS].evc_cond_state =
130 &smc->mib.p[i].fddiPORTEB_Condition ;
131
132 /*
133 * events
134 */
135 smc->evcs[offset + 2*NUMPHYS].evc_multiple =
136 &smc->mib.p[i].fddiPORTMultiple_U ;
137 smc->evcs[offset + 3*NUMPHYS].evc_multiple =
138 &smc->mib.p[i].fddiPORTMultiple_P ;
139 offset++ ;
140 }
141 #ifdef DEBUG
142 for (i = 0, evc = smc->evcs ; (unsigned) i < MAX_EVCS ; i++, evc++) {
143 if (SMT_IS_CONDITION(evc->evc_code)) {
144 if (!evc->evc_cond_state) {
145 SMT_PANIC(smc,SMT_E0128, SMT_E0128_MSG) ;
146 }
147 evc->evc_multiple = &fail_safe ;
148 }
149 else {
150 if (!evc->evc_multiple) {
151 SMT_PANIC(smc,SMT_E0129, SMT_E0129_MSG) ;
152 }
153 evc->evc_cond_state = &fail_safe ;
154 }
155 }
156 #endif
157 smc->srf.TSR = smt_get_time() ;
158 smc->srf.sr_state = SR0_WAIT ;
159 }
160
161 static struct s_srf_evc *smt_get_evc(struct s_smc *smc, int code, int index)
162 {
163 int i ;
164 struct s_srf_evc *evc ;
165
166 for (i = 0, evc = smc->evcs ; (unsigned) i < MAX_EVCS ; i++, evc++) {
167 if (evc->evc_code == code && evc->evc_index == index)
168 return evc;
169 }
170 return NULL;
171 }
172
173 #define THRESHOLD_2 (2*TICKS_PER_SECOND)
174 #define THRESHOLD_32 (32*TICKS_PER_SECOND)
175
176 #ifdef DEBUG
177 static const char * const srf_names[] = {
178 "None","MACPathChangeEvent", "MACNeighborChangeEvent",
179 "PORTPathChangeEvent", "PORTUndesiredConnectionAttemptEvent",
180 "SMTPeerWrapCondition", "SMTHoldCondition",
181 "MACFrameErrorCondition", "MACDuplicateAddressCondition",
182 "MACNotCopiedCondition", "PORTEBErrorCondition",
183 "PORTLerCondition"
184 } ;
185 #endif
186
187 void smt_srf_event(struct s_smc *smc, int code, int index, int cond)
188 {
189 struct s_srf_evc *evc ;
190 int cond_asserted = 0 ;
191 int cond_deasserted = 0 ;
192 int event_occurred = 0 ;
193 int tsr ;
194 int T_Limit = 2*TICKS_PER_SECOND ;
195
196 if (code == SMT_COND_MAC_DUP_ADDR && cond) {
197 RS_SET(smc,RS_DUPADDR) ;
198 }
199
200 if (code) {
201 DB_SMT("SRF: %s index %d\n",srf_names[code],index) ;
202
203 if (!(evc = smt_get_evc(smc,code,index))) {
204 DB_SMT("SRF : smt_get_evc() failed\n",0,0) ;
205 return ;
206 }
207 /*
208 * ignore condition if no change
209 */
210 if (SMT_IS_CONDITION(code)) {
211 if (*evc->evc_cond_state == cond)
212 return ;
213 }
214
215 /*
216 * set transition time stamp
217 */
218 smt_set_timestamp(smc,smc->mib.fddiSMTTransitionTimeStamp) ;
219 if (SMT_IS_CONDITION(code)) {
220 DB_SMT("SRF: condition is %s\n",cond ? "ON":"OFF",0) ;
221 if (cond) {
222 *evc->evc_cond_state = TRUE ;
223 evc->evc_rep_required = TRUE ;
224 smc->srf.any_report = TRUE ;
225 cond_asserted = TRUE ;
226 }
227 else {
228 *evc->evc_cond_state = FALSE ;
229 cond_deasserted = TRUE ;
230 }
231 }
232 else {
233 if (evc->evc_rep_required) {
234 *evc->evc_multiple = TRUE ;
235 }
236 else {
237 evc->evc_rep_required = TRUE ;
238 *evc->evc_multiple = FALSE ;
239 }
240 smc->srf.any_report = TRUE ;
241 event_occurred = TRUE ;
242 }
243 #ifdef FDDI_MIB
244 snmp_srf_event(smc,evc) ;
245 #endif /* FDDI_MIB */
246 }
247 tsr = smt_get_time() - smc->srf.TSR ;
248
249 switch (smc->srf.sr_state) {
250 case SR0_WAIT :
251 /* SR01a */
252 if (cond_asserted && tsr < T_Limit) {
253 smc->srf.SRThreshold = THRESHOLD_2 ;
254 smc->srf.sr_state = SR1_HOLDOFF ;
255 break ;
256 }
257 /* SR01b */
258 if (cond_deasserted && tsr < T_Limit) {
259 smc->srf.sr_state = SR1_HOLDOFF ;
260 break ;
261 }
262 /* SR01c */
263 if (event_occurred && tsr < T_Limit) {
264 smc->srf.sr_state = SR1_HOLDOFF ;
265 break ;
266 }
267 /* SR00b */
268 if (cond_asserted && tsr >= T_Limit) {
269 smc->srf.SRThreshold = THRESHOLD_2 ;
270 smc->srf.TSR = smt_get_time() ;
271 smt_send_srf(smc) ;
272 break ;
273 }
274 /* SR00c */
275 if (cond_deasserted && tsr >= T_Limit) {
276 smc->srf.TSR = smt_get_time() ;
277 smt_send_srf(smc) ;
278 break ;
279 }
280 /* SR00d */
281 if (event_occurred && tsr >= T_Limit) {
282 smc->srf.TSR = smt_get_time() ;
283 smt_send_srf(smc) ;
284 break ;
285 }
286 /* SR00e */
287 if (smc->srf.any_report && (u_long) tsr >=
288 smc->srf.SRThreshold) {
289 smc->srf.SRThreshold *= 2 ;
290 if (smc->srf.SRThreshold > THRESHOLD_32)
291 smc->srf.SRThreshold = THRESHOLD_32 ;
292 smc->srf.TSR = smt_get_time() ;
293 smt_send_srf(smc) ;
294 break ;
295 }
296 /* SR02 */
297 if (!smc->mib.fddiSMTStatRptPolicy) {
298 smc->srf.sr_state = SR2_DISABLED ;
299 break ;
300 }
301 break ;
302 case SR1_HOLDOFF :
303 /* SR10b */
304 if (tsr >= T_Limit) {
305 smc->srf.sr_state = SR0_WAIT ;
306 smc->srf.TSR = smt_get_time() ;
307 smt_send_srf(smc) ;
308 break ;
309 }
310 /* SR11a */
311 if (cond_asserted) {
312 smc->srf.SRThreshold = THRESHOLD_2 ;
313 }
314 /* SR11b */
315 /* SR11c */
316 /* handled above */
317 /* SR12 */
318 if (!smc->mib.fddiSMTStatRptPolicy) {
319 smc->srf.sr_state = SR2_DISABLED ;
320 break ;
321 }
322 break ;
323 case SR2_DISABLED :
324 if (smc->mib.fddiSMTStatRptPolicy) {
325 smc->srf.sr_state = SR0_WAIT ;
326 smc->srf.TSR = smt_get_time() ;
327 smc->srf.SRThreshold = THRESHOLD_2 ;
328 clear_all_rep(smc) ;
329 break ;
330 }
331 break ;
332 }
333 }
334
335 static void clear_all_rep(struct s_smc *smc)
336 {
337 struct s_srf_evc *evc ;
338 int i ;
339
340 for (i = 0, evc = smc->evcs ; (unsigned) i < MAX_EVCS ; i++, evc++) {
341 evc->evc_rep_required = FALSE ;
342 if (SMT_IS_CONDITION(evc->evc_code))
343 *evc->evc_cond_state = FALSE ;
344 }
345 smc->srf.any_report = FALSE ;
346 }
347
348 static void clear_reported(struct s_smc *smc)
349 {
350 struct s_srf_evc *evc ;
351 int i ;
352
353 smc->srf.any_report = FALSE ;
354 for (i = 0, evc = smc->evcs ; (unsigned) i < MAX_EVCS ; i++, evc++) {
355 if (SMT_IS_CONDITION(evc->evc_code)) {
356 if (*evc->evc_cond_state == FALSE)
357 evc->evc_rep_required = FALSE ;
358 else
359 smc->srf.any_report = TRUE ;
360 }
361 else {
362 evc->evc_rep_required = FALSE ;
363 *evc->evc_multiple = FALSE ;
364 }
365 }
366 }
367
368 /*
369 * build and send SMT SRF frame
370 */
371 static void smt_send_srf(struct s_smc *smc)
372 {
373
374 struct smt_header *smt ;
375 struct s_srf_evc *evc ;
376 SK_LOC_DECL(struct s_pcon,pcon) ;
377 SMbuf *mb ;
378 int i ;
379
380 static const struct fddi_addr SMT_SRF_DA = {
381 { 0x80, 0x01, 0x43, 0x00, 0x80, 0x08 }
382 } ;
383
384 /*
385 * build SMT header
386 */
387 if (!smc->r.sm_ma_avail)
388 return ;
389 if (!(mb = smt_build_frame(smc,SMT_SRF,SMT_ANNOUNCE,0)))
390 return ;
391
392 RS_SET(smc,RS_SOFTERROR) ;
393
394 smt = smtod(mb, struct smt_header *) ;
395 smt->smt_dest = SMT_SRF_DA ; /* DA == SRF multicast */
396
397 /*
398 * setup parameter status
399 */
400 pcon.pc_len = SMT_MAX_INFO_LEN ; /* max para length */
401 pcon.pc_err = 0 ; /* no error */
402 pcon.pc_badset = 0 ; /* no bad set count */
403 pcon.pc_p = (void *) (smt + 1) ; /* paras start here */
404
405 smt_add_para(smc,&pcon,(u_short) SMT_P1033,0,0) ;
406 smt_add_para(smc,&pcon,(u_short) SMT_P1034,0,0) ;
407
408 for (i = 0, evc = smc->evcs ; (unsigned) i < MAX_EVCS ; i++, evc++) {
409 if (evc->evc_rep_required) {
410 smt_add_para(smc,&pcon,evc->evc_para,
411 (int)evc->evc_index,0) ;
412 }
413 }
414 smt->smt_len = SMT_MAX_INFO_LEN - pcon.pc_len ;
415 mb->sm_len = smt->smt_len + sizeof(struct smt_header) ;
416
417 DB_SMT("SRF: sending SRF at %x, len %d\n",smt,mb->sm_len) ;
418 DB_SMT("SRF: state SR%d Threshold %d\n",
419 smc->srf.sr_state,smc->srf.SRThreshold/TICKS_PER_SECOND) ;
420 #ifdef DEBUG
421 dump_smt(smc,smt,"SRF Send") ;
422 #endif
423 smt_send_frame(smc,mb,FC_SMT_INFO,0) ;
424 clear_reported(smc) ;
425 }
426
427 #endif /* no BOOT */
428 #endif /* no SLIM_SMT */
429
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