- 根目录:
- drivers
- net
- fddi
- skfp
- srf.c
/******************************************************************************
*
* (C)Copyright 1998,1999 SysKonnect,
* a business unit of Schneider & Koch & Co. Datensysteme GmbH.
*
* See the file "skfddi.c" for further information.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* The information in this file is provided "AS IS" without warranty.
*
******************************************************************************/
/*
SMT 7.2 Status Response Frame Implementation
SRF state machine and frame generation
*/
#include "h/types.h"
#include "h/fddi.h"
#include "h/smc.h"
#include "h/smt_p.h"
#define KERNEL
#include "h/smtstate.h"
#ifndef SLIM_SMT
#ifndef BOOT
#ifndef lint
static const char ID_sccs[] = "@(#)srf.c 1.18 97/08/04 (C) SK " ;
#endif
/*
* function declarations
*/
static void clear_all_rep(struct s_smc *smc);
static void clear_reported(struct s_smc *smc);
static void smt_send_srf(struct s_smc *smc);
static struct s_srf_evc *smt_get_evc(struct s_smc *smc, int code, int index);
#define MAX_EVCS ARRAY_SIZE(smc->evcs)
struct evc_init {
u_char code ;
u_char index ;
u_char n ;
u_short para ;
} ;
static const struct evc_init evc_inits[] = {
{ SMT_COND_SMT_PEER_WRAP, 0,1,SMT_P1048 } ,
{ SMT_COND_MAC_DUP_ADDR, INDEX_MAC, NUMMACS,SMT_P208C } ,
{ SMT_COND_MAC_FRAME_ERROR, INDEX_MAC, NUMMACS,SMT_P208D } ,
{ SMT_COND_MAC_NOT_COPIED, INDEX_MAC, NUMMACS,SMT_P208E } ,
{ SMT_EVENT_MAC_NEIGHBOR_CHANGE, INDEX_MAC, NUMMACS,SMT_P208F } ,
{ SMT_EVENT_MAC_PATH_CHANGE, INDEX_MAC, NUMMACS,SMT_P2090 } ,
{ SMT_COND_PORT_LER, INDEX_PORT,NUMPHYS,SMT_P4050 } ,
{ SMT_COND_PORT_EB_ERROR, INDEX_PORT,NUMPHYS,SMT_P4052 } ,
{ SMT_EVENT_PORT_CONNECTION, INDEX_PORT,NUMPHYS,SMT_P4051 } ,
{ SMT_EVENT_PORT_PATH_CHANGE, INDEX_PORT,NUMPHYS,SMT_P4053 } ,
} ;
#define MAX_INIT_EVC ARRAY_SIZE(evc_inits)
void smt_init_evc(struct s_smc *smc)
{
struct s_srf_evc *evc ;
const struct evc_init *init ;
int i ;
int index ;
int offset ;
static u_char fail_safe = FALSE ;
memset((char *)smc->evcs,0,sizeof(smc->evcs)) ;
evc = smc->evcs ;
init = evc_inits ;
for (i = 0 ; (unsigned) i < MAX_INIT_EVC ; i++) {
for (index = 0 ; index < init->n ; index++) {
evc->evc_code = init->code ;
evc->evc_para = init->para ;
evc->evc_index = init->index + index ;
#ifndef DEBUG
evc->evc_multiple = &fail_safe ;
evc->evc_cond_state = &fail_safe ;
#endif
evc++ ;
}
init++ ;
}
if ((unsigned) (evc - smc->evcs) > MAX_EVCS) {
SMT_PANIC(smc,SMT_E0127, SMT_E0127_MSG) ;
}
/*
* conditions
*/
smc->evcs[0].evc_cond_state = &smc->mib.fddiSMTPeerWrapFlag ;
smc->evcs[1].evc_cond_state =
&smc->mib.m[MAC0].fddiMACDuplicateAddressCond ;
smc->evcs[2].evc_cond_state =
&smc->mib.m[MAC0].fddiMACFrameErrorFlag ;
smc->evcs[3].evc_cond_state =
&smc->mib.m[MAC0].fddiMACNotCopiedFlag ;
/*
* events
*/
smc->evcs[4].evc_multiple = &smc->mib.m[MAC0].fddiMACMultiple_N ;
smc->evcs[5].evc_multiple = &smc->mib.m[MAC0].fddiMACMultiple_P ;
offset = 6 ;
for (i = 0 ; i < NUMPHYS ; i++) {
/*
* conditions
*/
smc->evcs[offset + 0*NUMPHYS].evc_cond_state =
&smc->mib.p[i].fddiPORTLerFlag ;
smc->evcs[offset + 1*NUMPHYS].evc_cond_state =
&smc->mib.p[i].fddiPORTEB_Condition ;
/*
* events
*/
smc->evcs[offset + 2*NUMPHYS].evc_multiple =
&smc->mib.p[i].fddiPORTMultiple_U ;
smc->evcs[offset + 3*NUMPHYS].evc_multiple =
&smc->mib.p[i].fddiPORTMultiple_P ;
offset++ ;
}
#ifdef DEBUG
for (i = 0, evc = smc->evcs ; (unsigned) i < MAX_EVCS ; i++, evc++) {
if (SMT_IS_CONDITION(evc->evc_code)) {
if (!evc->evc_cond_state) {
SMT_PANIC(smc,SMT_E0128, SMT_E0128_MSG) ;
}
evc->evc_multiple = &fail_safe ;
}
else {
if (!evc->evc_multiple) {
SMT_PANIC(smc,SMT_E0129, SMT_E0129_MSG) ;
}
evc->evc_cond_state = &fail_safe ;
}
}
#endif
smc->srf.TSR = smt_get_time() ;
smc->srf.sr_state = SR0_WAIT ;
}
static struct s_srf_evc *smt_get_evc(struct s_smc *smc, int code, int index)
{
int i ;
struct s_srf_evc *evc ;
for (i = 0, evc = smc->evcs ; (unsigned) i < MAX_EVCS ; i++, evc++) {
if (evc->evc_code == code && evc->evc_index == index)
return evc;
}
return NULL;
}
#define THRESHOLD_2 (2*TICKS_PER_SECOND)
#define THRESHOLD_32 (32*TICKS_PER_SECOND)
#ifdef DEBUG
static const char * const srf_names[] = {
"None","MACPathChangeEvent", "MACNeighborChangeEvent",
"PORTPathChangeEvent", "PORTUndesiredConnectionAttemptEvent",
"SMTPeerWrapCondition", "SMTHoldCondition",
"MACFrameErrorCondition", "MACDuplicateAddressCondition",
"MACNotCopiedCondition", "PORTEBErrorCondition",
"PORTLerCondition"
} ;
#endif
void smt_srf_event(struct s_smc *smc, int code, int index, int cond)
{
struct s_srf_evc *evc ;
int cond_asserted = 0 ;
int cond_deasserted = 0 ;
int event_occurred = 0 ;
int tsr ;
int T_Limit = 2*TICKS_PER_SECOND ;
if (code == SMT_COND_MAC_DUP_ADDR && cond) {
RS_SET(smc,RS_DUPADDR) ;
}
if (code) {
DB_SMT("SRF: %s index %d\n",srf_names[code],index) ;
if (!(evc = smt_get_evc(smc,code,index))) {
DB_SMT("SRF : smt_get_evc() failed\n",0,0) ;
return ;
}
/*
* ignore condition if no change
*/
if (SMT_IS_CONDITION(code)) {
if (*evc->evc_cond_state == cond)
return ;
}
/*
* set transition time stamp
*/
smt_set_timestamp(smc,smc->mib.fddiSMTTransitionTimeStamp) ;
if (SMT_IS_CONDITION(code)) {
DB_SMT("SRF: condition is %s\n",cond ? "ON":"OFF",0) ;
if (cond) {
*evc->evc_cond_state = TRUE ;
evc->evc_rep_required = TRUE ;
smc->srf.any_report = TRUE ;
cond_asserted = TRUE ;
}
else {
*evc->evc_cond_state = FALSE ;
cond_deasserted = TRUE ;
}
}
else {
if (evc->evc_rep_required) {
*evc->evc_multiple = TRUE ;
}
else {
evc->evc_rep_required = TRUE ;
*evc->evc_multiple = FALSE ;
}
smc->srf.any_report = TRUE ;
event_occurred = TRUE ;
}
#ifdef FDDI_MIB
snmp_srf_event(smc,evc) ;
#endif /* FDDI_MIB */
}
tsr = smt_get_time() - smc->srf.TSR ;
switch (smc->srf.sr_state) {
case SR0_WAIT :
/* SR01a */
if (cond_asserted && tsr < T_Limit) {
smc->srf.SRThreshold = THRESHOLD_2 ;
smc->srf.sr_state = SR1_HOLDOFF ;
break ;
}
/* SR01b */
if (cond_deasserted && tsr < T_Limit) {
smc->srf.sr_state = SR1_HOLDOFF ;
break ;
}
/* SR01c */
if (event_occurred && tsr < T_Limit) {
smc->srf.sr_state = SR1_HOLDOFF ;
break ;
}
/* SR00b */
if (cond_asserted && tsr >= T_Limit) {
smc->srf.SRThreshold = THRESHOLD_2 ;
smc->srf.TSR = smt_get_time() ;
smt_send_srf(smc) ;
break ;
}
/* SR00c */
if (cond_deasserted && tsr >= T_Limit) {
smc->srf.TSR = smt_get_time() ;
smt_send_srf(smc) ;
break ;
}
/* SR00d */
if (event_occurred && tsr >= T_Limit) {
smc->srf.TSR = smt_get_time() ;
smt_send_srf(smc) ;
break ;
}
/* SR00e */
if (smc->srf.any_report && (u_long) tsr >=
smc->srf.SRThreshold) {
smc->srf.SRThreshold *= 2 ;
if (smc->srf.SRThreshold > THRESHOLD_32)
smc->srf.SRThreshold = THRESHOLD_32 ;
smc->srf.TSR = smt_get_time() ;
smt_send_srf(smc) ;
break ;
}
/* SR02 */
if (!smc->mib.fddiSMTStatRptPolicy) {
smc->srf.sr_state = SR2_DISABLED ;
break ;
}
break ;
case SR1_HOLDOFF :
/* SR10b */
if (tsr >= T_Limit) {
smc->srf.sr_state = SR0_WAIT ;
smc->srf.TSR = smt_get_time() ;
smt_send_srf(smc) ;
break ;
}
/* SR11a */
if (cond_asserted) {
smc->srf.SRThreshold = THRESHOLD_2 ;
}
/* SR11b */
/* SR11c */
/* handled above */
/* SR12 */
if (!smc->mib.fddiSMTStatRptPolicy) {
smc->srf.sr_state = SR2_DISABLED ;
break ;
}
break ;
case SR2_DISABLED :
if (smc->mib.fddiSMTStatRptPolicy) {
smc->srf.sr_state = SR0_WAIT ;
smc->srf.TSR = smt_get_time() ;
smc->srf.SRThreshold = THRESHOLD_2 ;
clear_all_rep(smc) ;
break ;
}
break ;
}
}
static void clear_all_rep(struct s_smc *smc)
{
struct s_srf_evc *evc ;
int i ;
for (i = 0, evc = smc->evcs ; (unsigned) i < MAX_EVCS ; i++, evc++) {
evc->evc_rep_required = FALSE ;
if (SMT_IS_CONDITION(evc->evc_code))
*evc->evc_cond_state = FALSE ;
}
smc->srf.any_report = FALSE ;
}
static void clear_reported(struct s_smc *smc)
{
struct s_srf_evc *evc ;
int i ;
smc->srf.any_report = FALSE ;
for (i = 0, evc = smc->evcs ; (unsigned) i < MAX_EVCS ; i++, evc++) {
if (SMT_IS_CONDITION(evc->evc_code)) {
if (*evc->evc_cond_state == FALSE)
evc->evc_rep_required = FALSE ;
else
smc->srf.any_report = TRUE ;
}
else {
evc->evc_rep_required = FALSE ;
*evc->evc_multiple = FALSE ;
}
}
}
/*
* build and send SMT SRF frame
*/
static void smt_send_srf(struct s_smc *smc)
{
struct smt_header *smt ;
struct s_srf_evc *evc ;
SK_LOC_DECL(struct s_pcon,pcon) ;
SMbuf *mb ;
int i ;
static const struct fddi_addr SMT_SRF_DA = {
{ 0x80, 0x01, 0x43, 0x00, 0x80, 0x08 }
} ;
/*
* build SMT header
*/
if (!smc->r.sm_ma_avail)
return ;
if (!(mb = smt_build_frame(smc,SMT_SRF,SMT_ANNOUNCE,0)))
return ;
RS_SET(smc,RS_SOFTERROR) ;
smt = smtod(mb, struct smt_header *) ;
smt->smt_dest = SMT_SRF_DA ; /* DA == SRF multicast */
/*
* setup parameter status
*/
pcon.pc_len = SMT_MAX_INFO_LEN ; /* max para length */
pcon.pc_err = 0 ; /* no error */
pcon.pc_badset = 0 ; /* no bad set count */
pcon.pc_p = (void *) (smt + 1) ; /* paras start here */
smt_add_para(smc,&pcon,(u_short) SMT_P1033,0,0) ;
smt_add_para(smc,&pcon,(u_short) SMT_P1034,0,0) ;
for (i = 0, evc = smc->evcs ; (unsigned) i < MAX_EVCS ; i++, evc++) {
if (evc->evc_rep_required) {
smt_add_para(smc,&pcon,evc->evc_para,
(int)evc->evc_index,0) ;
}
}
smt->smt_len = SMT_MAX_INFO_LEN - pcon.pc_len ;
mb->sm_len = smt->smt_len + sizeof(struct smt_header) ;
DB_SMT("SRF: sending SRF at %x, len %d\n",smt,mb->sm_len) ;
DB_SMT("SRF: state SR%d Threshold %d\n",
smc->srf.sr_state,smc->srf.SRThreshold/TICKS_PER_SECOND) ;
#ifdef DEBUG
dump_smt(smc,smt,"SRF Send") ;
#endif
smt_send_frame(smc,mb,FC_SMT_INFO,0) ;
clear_reported(smc) ;
}
#endif /* no BOOT */
#endif /* no SLIM_SMT */