// SPDX-License-Identifier: GPL-2.0-or-later
/******************************************************************************
*
* ( C ) Copyright 1998 , 1999 SysKonnect ,
* a business unit of Schneider & Koch & Co . Datensysteme GmbH .
*
* See the file " skfddi . c " for further information .
*
* The information in this file is provided " AS IS " without warranty .
*
******************************************************************************/
/*
SMT RMT
Ring Management
*/
/*
* Hardware independent state machine implemantation
* The following external SMT functions are referenced :
*
* queue_event ( )
* smt_timer_start ( )
* smt_timer_stop ( )
*
* The following external HW dependent functions are referenced :
* sm_ma_control ( )
* sm_mac_check_beacon_claim ( )
*
* The following HW dependent events are required :
* RM_RING_OP
* RM_RING_NON_OP
* RM_MY_BEACON
* RM_OTHER_BEACON
* RM_MY_CLAIM
* RM_TRT_EXP
* RM_VALID_CLAIM
*
*/
#include "h/types.h"
#include "h/fddi.h"
#include "h/smc.h"
#define KERNEL
#include "h/smtstate.h"
/*
* FSM Macros
*/
#define AFLAG 0 x10
#define GO_STATE(x) (smc->mib.m[MAC0].fddiMACRMTState = (x)|AFLAG)
#define ACTIONS_DONE() (smc->mib.m[MAC0].fddiMACRMTState &= ~AFLAG)
#define ACTIONS(x) (x|AFLAG)
#define RM0_ISOLATED 0
#define RM1_NON_OP 1 /* not operational */
#define RM2_RING_OP 2 /* ring operational */
#define RM3_DETECT 3 /* detect dupl addresses */
#define RM4_NON_OP_DUP 4 /* dupl. addr detected */
#define RM5_RING_OP_DUP 5 /* ring oper. with dupl. addr */
#define RM6_DIRECTED 6 /* sending directed beacons */
#define RM7_TRACE 7 /* trace initiated */
/*
* symbolic state names
*/
static const char * const rmt_states[] = {
"RM0_ISOLATED" ,"RM1_NON_OP" ,"RM2_RING_OP" ,"RM3_DETECT" ,
"RM4_NON_OP_DUP" ,"RM5_RING_OP_DUP" ,"RM6_DIRECTED" ,
"RM7_TRACE"
} ;
/*
* symbolic event names
*/
static const char * const rmt_events[] = {
"NONE" ,"RM_RING_OP" ,"RM_RING_NON_OP" ,"RM_MY_BEACON" ,
"RM_OTHER_BEACON" ,"RM_MY_CLAIM" ,"RM_TRT_EXP" ,"RM_VALID_CLAIM" ,
"RM_JOIN" ,"RM_LOOP" ,"RM_DUP_ADDR" ,"RM_ENABLE_FLAG" ,
"RM_TIMEOUT_NON_OP" ,"RM_TIMEOUT_T_STUCK" ,
"RM_TIMEOUT_ANNOUNCE" ,"RM_TIMEOUT_T_DIRECT" ,
"RM_TIMEOUT_D_MAX" ,"RM_TIMEOUT_POLL" ,"RM_TX_STATE_CHANGE"
} ;
/*
* Globals
* in struct s_rmt
*/
/*
* function declarations
*/
static void rmt_fsm(struct s_smc *smc, int cmd);
static void start_rmt_timer0(struct s_smc *smc, u_long value, int event);
static void start_rmt_timer1(struct s_smc *smc, u_long value, int event);
static void start_rmt_timer2(struct s_smc *smc, u_long value, int event);
static void stop_rmt_timer0(struct s_smc *smc);
static void stop_rmt_timer1(struct s_smc *smc);
static void stop_rmt_timer2(struct s_smc *smc);
static void rmt_dup_actions(struct s_smc *smc);
static void rmt_reinsert_actions(struct s_smc *smc);
static void rmt_leave_actions(struct s_smc *smc);
static void rmt_new_dup_actions(struct s_smc *smc);
#ifndef SUPERNET_3
extern void restart_trt_for_dbcn() ;
#endif /*SUPERNET_3*/
/*
init RMT state machine
clear all RMT vars and flags
*/
void rmt_init(struct s_smc *smc)
{
smc->mib.m[MAC0].fddiMACRMTState = ACTIONS(RM0_ISOLATED) ;
smc->r.dup_addr_test = DA_NONE ;
smc->r.da_flag = 0 ;
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = FALSE ;
smc->r.sm_ma_avail = FALSE ;
smc->r.loop_avail = 0 ;
smc->r.bn_flag = 0 ;
smc->r.jm_flag = 0 ;
smc->r.no_flag = TRUE ;
}
/*
RMT state machine
called by dispatcher
do
display state change
process event
until SM is stable
*/
void rmt(struct s_smc *smc, int event)
{
int state ;
do {
DB_RMT("RMT : state %s%s event %s" ,
smc->mib.m[MAC0].fddiMACRMTState & AFLAG ? "ACTIONS " : "" ,
rmt_states[smc->mib.m[MAC0].fddiMACRMTState & ~AFLAG],
rmt_events[event]);
state = smc->mib.m[MAC0].fddiMACRMTState ;
rmt_fsm(smc,event) ;
event = 0 ;
} while (state != smc->mib.m[MAC0].fddiMACRMTState) ;
rmt_state_change(smc,(int )smc->mib.m[MAC0].fddiMACRMTState) ;
}
/*
process RMT event
*/
static void rmt_fsm(struct s_smc *smc, int cmd)
{
/*
* RM00 - RM70 : from all states
*/
if (!smc->r.rm_join && !smc->r.rm_loop &&
smc->mib.m[MAC0].fddiMACRMTState != ACTIONS(RM0_ISOLATED) &&
smc->mib.m[MAC0].fddiMACRMTState != RM0_ISOLATED) {
RS_SET(smc,RS_NORINGOP) ;
rmt_indication(smc,0 ) ;
GO_STATE(RM0_ISOLATED) ;
return ;
}
switch (smc->mib.m[MAC0].fddiMACRMTState) {
case ACTIONS(RM0_ISOLATED) :
stop_rmt_timer0(smc) ;
stop_rmt_timer1(smc) ;
stop_rmt_timer2(smc) ;
/*
* Disable MAC .
*/
sm_ma_control(smc,MA_OFFLINE) ;
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = FALSE ;
smc->r.loop_avail = FALSE ;
smc->r.sm_ma_avail = FALSE ;
smc->r.no_flag = TRUE ;
DB_RMTN(1 , "RMT : ISOLATED" );
ACTIONS_DONE() ;
break ;
case RM0_ISOLATED :
/*RM01*/
if (smc->r.rm_join || smc->r.rm_loop) {
/*
* According to the standard the MAC must be reset
* here . The FORMAC will be initialized and Claim
* and Beacon Frames will be uploaded to the MAC .
* So any change of Treq will take effect NOW .
*/
sm_ma_control(smc,MA_RESET) ;
GO_STATE(RM1_NON_OP) ;
break ;
}
break ;
case ACTIONS(RM1_NON_OP) :
start_rmt_timer0(smc,smc->s.rmt_t_non_op,RM_TIMEOUT_NON_OP) ;
stop_rmt_timer1(smc) ;
stop_rmt_timer2(smc) ;
sm_ma_control(smc,MA_BEACON) ;
DB_RMTN(1 , "RMT : RING DOWN" );
RS_SET(smc,RS_NORINGOP) ;
smc->r.sm_ma_avail = FALSE ;
rmt_indication(smc,0 ) ;
ACTIONS_DONE() ;
break ;
case RM1_NON_OP :
/*RM12*/
if (cmd == RM_RING_OP) {
RS_SET(smc,RS_RINGOPCHANGE) ;
GO_STATE(RM2_RING_OP) ;
break ;
}
/*RM13*/
else if (cmd == RM_TIMEOUT_NON_OP) {
smc->r.bn_flag = FALSE ;
smc->r.no_flag = TRUE ;
GO_STATE(RM3_DETECT) ;
break ;
}
break ;
case ACTIONS(RM2_RING_OP) :
stop_rmt_timer0(smc) ;
stop_rmt_timer1(smc) ;
stop_rmt_timer2(smc) ;
smc->r.no_flag = FALSE ;
if (smc->r.rm_loop)
smc->r.loop_avail = TRUE ;
if (smc->r.rm_join) {
smc->r.sm_ma_avail = TRUE ;
if (smc->mib.m[MAC0].fddiMACMA_UnitdataEnable)
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = TRUE ;
else
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = FALSE ;
}
DB_RMTN(1 , "RMT : RING UP" );
RS_CLEAR(smc,RS_NORINGOP) ;
RS_SET(smc,RS_RINGOPCHANGE) ;
rmt_indication(smc,1 ) ;
smt_stat_counter(smc,0 ) ;
ACTIONS_DONE() ;
break ;
case RM2_RING_OP :
/*RM21*/
if (cmd == RM_RING_NON_OP) {
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = FALSE ;
smc->r.loop_avail = FALSE ;
RS_SET(smc,RS_RINGOPCHANGE) ;
GO_STATE(RM1_NON_OP) ;
break ;
}
/*RM22a*/
else if (cmd == RM_ENABLE_FLAG) {
if (smc->mib.m[MAC0].fddiMACMA_UnitdataEnable)
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = TRUE ;
else
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = FALSE ;
}
/*RM25*/
else if (smc->r.dup_addr_test == DA_FAILED) {
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = FALSE ;
smc->r.loop_avail = FALSE ;
smc->r.da_flag = TRUE ;
GO_STATE(RM5_RING_OP_DUP) ;
break ;
}
break ;
case ACTIONS(RM3_DETECT) :
start_rmt_timer0(smc,smc->s.mac_d_max*2 ,RM_TIMEOUT_D_MAX) ;
start_rmt_timer1(smc,smc->s.rmt_t_stuck,RM_TIMEOUT_T_STUCK) ;
start_rmt_timer2(smc,smc->s.rmt_t_poll,RM_TIMEOUT_POLL) ;
sm_mac_check_beacon_claim(smc) ;
DB_RMTN(1 , "RMT : RM3_DETECT" );
ACTIONS_DONE() ;
break ;
case RM3_DETECT :
if (cmd == RM_TIMEOUT_POLL) {
start_rmt_timer2(smc,smc->s.rmt_t_poll,RM_TIMEOUT_POLL);
sm_mac_check_beacon_claim(smc) ;
break ;
}
if (cmd == RM_TIMEOUT_D_MAX) {
smc->r.timer0_exp = TRUE ;
}
/*
* jd ( 22 - Feb - 1999 )
* We need a time " > = 2 * mac_d_max " since we had finished
* Claim or Beacon state . So we will restart timer0 at
* every state change .
*/
if (cmd == RM_TX_STATE_CHANGE) {
start_rmt_timer0(smc,
smc->s.mac_d_max*2 ,
RM_TIMEOUT_D_MAX) ;
}
/*RM32*/
if (cmd == RM_RING_OP) {
GO_STATE(RM2_RING_OP) ;
break ;
}
/*RM33a*/
else if ((cmd == RM_MY_BEACON || cmd == RM_OTHER_BEACON)
&& smc->r.bn_flag) {
smc->r.bn_flag = FALSE ;
}
/*RM33b*/
else if (cmd == RM_TRT_EXP && !smc->r.bn_flag) {
int tx ;
/*
* set bn_flag only if in state T4 or T5 :
* only if we ' re the beaconer should we start the
* trace !
*/
if ((tx = sm_mac_get_tx_state(smc)) == 4 || tx == 5 ) {
DB_RMTN(2 , "RMT : DETECT && TRT_EXPIRED && T4/T5" );
smc->r.bn_flag = TRUE ;
/*
* If one of the upstream stations beaconed
* and the link to the upstream neighbor is
* lost we need to restart the stuck timer to
* check the " stuck beacon " condition .
*/
start_rmt_timer1(smc,smc->s.rmt_t_stuck,
RM_TIMEOUT_T_STUCK) ;
}
/*
* We do NOT need to clear smc - > r . bn_flag in case of
* not being in state T4 or T5 , because the flag
* must be cleared in order to get in this condition .
*/
DB_RMTN(2 , "RMT : sm_mac_get_tx_state() = %d (bn_flag = %d)" ,
tx, smc->r.bn_flag);
}
/*RM34a*/
else if (cmd == RM_MY_CLAIM && smc->r.timer0_exp) {
rmt_new_dup_actions(smc) ;
GO_STATE(RM4_NON_OP_DUP) ;
break ;
}
/*RM34b*/
else if (cmd == RM_MY_BEACON && smc->r.timer0_exp) {
rmt_new_dup_actions(smc) ;
GO_STATE(RM4_NON_OP_DUP) ;
break ;
}
/*RM34c*/
else if (cmd == RM_VALID_CLAIM) {
rmt_new_dup_actions(smc) ;
GO_STATE(RM4_NON_OP_DUP) ;
break ;
}
/*RM36*/
else if (cmd == RM_TIMEOUT_T_STUCK &&
smc->r.rm_join && smc->r.bn_flag) {
GO_STATE(RM6_DIRECTED) ;
break ;
}
break ;
case ACTIONS(RM4_NON_OP_DUP) :
start_rmt_timer0(smc,smc->s.rmt_t_announce,RM_TIMEOUT_ANNOUNCE);
start_rmt_timer1(smc,smc->s.rmt_t_stuck,RM_TIMEOUT_T_STUCK) ;
start_rmt_timer2(smc,smc->s.rmt_t_poll,RM_TIMEOUT_POLL) ;
sm_mac_check_beacon_claim(smc) ;
DB_RMTN(1 , "RMT : RM4_NON_OP_DUP" );
ACTIONS_DONE() ;
break ;
case RM4_NON_OP_DUP :
if (cmd == RM_TIMEOUT_POLL) {
start_rmt_timer2(smc,smc->s.rmt_t_poll,RM_TIMEOUT_POLL);
sm_mac_check_beacon_claim(smc) ;
break ;
}
/*RM41*/
if (!smc->r.da_flag) {
GO_STATE(RM1_NON_OP) ;
break ;
}
/*RM44a*/
else if ((cmd == RM_MY_BEACON || cmd == RM_OTHER_BEACON) &&
smc->r.bn_flag) {
smc->r.bn_flag = FALSE ;
}
/*RM44b*/
else if (cmd == RM_TRT_EXP && !smc->r.bn_flag) {
int tx ;
/*
* set bn_flag only if in state T4 or T5 :
* only if we ' re the beaconer should we start the
* trace !
*/
if ((tx = sm_mac_get_tx_state(smc)) == 4 || tx == 5 ) {
DB_RMTN(2 , "RMT : NOPDUP && TRT_EXPIRED && T4/T5" );
smc->r.bn_flag = TRUE ;
/*
* If one of the upstream stations beaconed
* and the link to the upstream neighbor is
* lost we need to restart the stuck timer to
* check the " stuck beacon " condition .
*/
start_rmt_timer1(smc,smc->s.rmt_t_stuck,
RM_TIMEOUT_T_STUCK) ;
}
/*
* We do NOT need to clear smc - > r . bn_flag in case of
* not being in state T4 or T5 , because the flag
* must be cleared in order to get in this condition .
*/
DB_RMTN(2 , "RMT : sm_mac_get_tx_state() = %d (bn_flag = %d)" ,
tx, smc->r.bn_flag);
}
/*RM44c*/
else if (cmd == RM_TIMEOUT_ANNOUNCE && !smc->r.bn_flag) {
rmt_dup_actions(smc) ;
}
/*RM45*/
else if (cmd == RM_RING_OP) {
smc->r.no_flag = FALSE ;
GO_STATE(RM5_RING_OP_DUP) ;
break ;
}
/*RM46*/
else if (cmd == RM_TIMEOUT_T_STUCK &&
smc->r.rm_join && smc->r.bn_flag) {
GO_STATE(RM6_DIRECTED) ;
break ;
}
break ;
case ACTIONS(RM5_RING_OP_DUP) :
stop_rmt_timer0(smc) ;
stop_rmt_timer1(smc) ;
stop_rmt_timer2(smc) ;
DB_RMTN(1 , "RMT : RM5_RING_OP_DUP" );
ACTIONS_DONE() ;
break ;
case RM5_RING_OP_DUP :
/*RM52*/
if (smc->r.dup_addr_test == DA_PASSED) {
smc->r.da_flag = FALSE ;
GO_STATE(RM2_RING_OP) ;
break ;
}
/*RM54*/
else if (cmd == RM_RING_NON_OP) {
smc->r.jm_flag = FALSE ;
smc->r.bn_flag = FALSE ;
GO_STATE(RM4_NON_OP_DUP) ;
break ;
}
break ;
case ACTIONS(RM6_DIRECTED) :
start_rmt_timer0(smc,smc->s.rmt_t_direct,RM_TIMEOUT_T_DIRECT) ;
stop_rmt_timer1(smc) ;
start_rmt_timer2(smc,smc->s.rmt_t_poll,RM_TIMEOUT_POLL) ;
sm_ma_control(smc,MA_DIRECTED) ;
RS_SET(smc,RS_BEACON) ;
DB_RMTN(1 , "RMT : RM6_DIRECTED" );
ACTIONS_DONE() ;
break ;
case RM6_DIRECTED :
/*RM63*/
if (cmd == RM_TIMEOUT_POLL) {
start_rmt_timer2(smc,smc->s.rmt_t_poll,RM_TIMEOUT_POLL);
sm_mac_check_beacon_claim(smc) ;
#ifndef SUPERNET_3
/* Because of problems with the Supernet II chip set
* sending of Directed Beacon will stop after 165 ms
* therefore restart_trt_for_dbcn ( smc ) will be called
* to prevent this .
*/
restart_trt_for_dbcn(smc) ;
#endif /*SUPERNET_3*/
break ;
}
if ((cmd == RM_MY_BEACON || cmd == RM_OTHER_BEACON) &&
!smc->r.da_flag) {
smc->r.bn_flag = FALSE ;
GO_STATE(RM3_DETECT) ;
break ;
}
/*RM64*/
else if ((cmd == RM_MY_BEACON || cmd == RM_OTHER_BEACON) &&
smc->r.da_flag) {
smc->r.bn_flag = FALSE ;
GO_STATE(RM4_NON_OP_DUP) ;
break ;
}
/*RM67*/
else if (cmd == RM_TIMEOUT_T_DIRECT) {
GO_STATE(RM7_TRACE) ;
break ;
}
break ;
case ACTIONS(RM7_TRACE) :
stop_rmt_timer0(smc) ;
stop_rmt_timer1(smc) ;
stop_rmt_timer2(smc) ;
smc->e.trace_prop |= ENTITY_BIT(ENTITY_MAC) ;
queue_event(smc,EVENT_ECM,EC_TRACE_PROP) ;
DB_RMTN(1 , "RMT : RM7_TRACE" );
ACTIONS_DONE() ;
break ;
case RM7_TRACE :
break ;
default :
SMT_PANIC(smc,SMT_E0122, SMT_E0122_MSG) ;
break ;
}
}
/*
* ( jd ) RMT duplicate address actions
* leave the ring or reinsert just as configured
*/
static void rmt_dup_actions(struct s_smc *smc)
{
if (smc->r.jm_flag) {
}
else {
if (smc->s.rmt_dup_mac_behavior) {
SMT_ERR_LOG(smc,SMT_E0138, SMT_E0138_MSG) ;
rmt_reinsert_actions(smc) ;
}
else {
SMT_ERR_LOG(smc,SMT_E0135, SMT_E0135_MSG) ;
rmt_leave_actions(smc) ;
}
}
}
/*
* Reconnect to the Ring
*/
static void rmt_reinsert_actions(struct s_smc *smc)
{
queue_event(smc,EVENT_ECM,EC_DISCONNECT) ;
queue_event(smc,EVENT_ECM,EC_CONNECT) ;
}
/*
* duplicate address detected
*/
static void rmt_new_dup_actions(struct s_smc *smc)
{
smc->r.da_flag = TRUE ;
smc->r.bn_flag = FALSE ;
smc->r.jm_flag = FALSE ;
/*
* we have three options : change address , jam or leave
* we leave the ring as default
* Optionally it ' s possible to reinsert after leaving the Ring
* but this will not conform with SMT Spec .
*/
if (smc->s.rmt_dup_mac_behavior) {
SMT_ERR_LOG(smc,SMT_E0138, SMT_E0138_MSG) ;
rmt_reinsert_actions(smc) ;
}
else {
SMT_ERR_LOG(smc,SMT_E0135, SMT_E0135_MSG) ;
rmt_leave_actions(smc) ;
}
}
/*
* leave the ring
*/
static void rmt_leave_actions(struct s_smc *smc)
{
queue_event(smc,EVENT_ECM,EC_DISCONNECT) ;
/*
* Note : Do NOT try again later . ( with please reconnect )
* The station must be left from the ring !
*/
}
/*
* SMT timer interface
* start RMT timer 0
*/
static void start_rmt_timer0(struct s_smc *smc, u_long value, int event)
{
smc->r.timer0_exp = FALSE ; /* clear timer event flag */
smt_timer_start(smc,&smc->r.rmt_timer0,value,EV_TOKEN(EVENT_RMT,event));
}
/*
* SMT timer interface
* start RMT timer 1
*/
static void start_rmt_timer1(struct s_smc *smc, u_long value, int event)
{
smc->r.timer1_exp = FALSE ; /* clear timer event flag */
smt_timer_start(smc,&smc->r.rmt_timer1,value,EV_TOKEN(EVENT_RMT,event));
}
/*
* SMT timer interface
* start RMT timer 2
*/
static void start_rmt_timer2(struct s_smc *smc, u_long value, int event)
{
smc->r.timer2_exp = FALSE ; /* clear timer event flag */
smt_timer_start(smc,&smc->r.rmt_timer2,value,EV_TOKEN(EVENT_RMT,event));
}
/*
* SMT timer interface
* stop RMT timer 0
*/
static void stop_rmt_timer0(struct s_smc *smc)
{
if (smc->r.rmt_timer0.tm_active)
smt_timer_stop(smc,&smc->r.rmt_timer0) ;
}
/*
* SMT timer interface
* stop RMT timer 1
*/
static void stop_rmt_timer1(struct s_smc *smc)
{
if (smc->r.rmt_timer1.tm_active)
smt_timer_stop(smc,&smc->r.rmt_timer1) ;
}
/*
* SMT timer interface
* stop RMT timer 2
*/
static void stop_rmt_timer2(struct s_smc *smc)
{
if (smc->r.rmt_timer2.tm_active)
smt_timer_stop(smc,&smc->r.rmt_timer2) ;
}
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