// 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 *
*/
/* * 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*/ elseif (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*/ elseif (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*/ elseif (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*/ elseif ((cmd == RM_MY_BEACON || cmd == RM_OTHER_BEACON)
&& smc->r.bn_flag) {
smc->r.bn_flag = FALSE ;
} /*RM33b*/ elseif (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*/ elseif (cmd == RM_MY_CLAIM && smc->r.timer0_exp) {
rmt_new_dup_actions(smc) ;
GO_STATE(RM4_NON_OP_DUP) ; break ;
} /*RM34b*/ elseif (cmd == RM_MY_BEACON && smc->r.timer0_exp) {
rmt_new_dup_actions(smc) ;
GO_STATE(RM4_NON_OP_DUP) ; break ;
} /*RM34c*/ elseif (cmd == RM_VALID_CLAIM) {
rmt_new_dup_actions(smc) ;
GO_STATE(RM4_NON_OP_DUP) ; break ;
} /*RM36*/ elseif (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*/ elseif ((cmd == RM_MY_BEACON || cmd == RM_OTHER_BEACON) &&
smc->r.bn_flag) {
smc->r.bn_flag = FALSE ;
} /*RM44b*/ elseif (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.
*/
/* * (jd) RMT duplicate address actions * leave the ring or reinsert just as configured
*/ staticvoid 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
*/ staticvoid rmt_reinsert_actions(struct s_smc *smc)
{
queue_event(smc,EVENT_ECM,EC_DISCONNECT) ;
queue_event(smc,EVENT_ECM,EC_CONNECT) ;
}
/* * duplicate address detected
*/ staticvoid 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
*/ staticvoid 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!
*/
}
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