[mirror_ubuntu-eoan-kernel.git] / drivers / net / fddi / skfp / cfm.c

// 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 CFM
	Configuration Management
	DAS with single MAC
*/

/*
 *	Hardware independent state machine implemantation
 *	The following external SMT functions are referenced :
 *
 *		queue_event()
 *
 *	The following external HW dependent functions are referenced :
 *		config_mux()
 *
 *	The following HW dependent events are required :
 *		NONE 
 */

#include "h/types.h"
#include "h/fddi.h"
#include "h/smc.h"

#define KERNEL
#include "h/smtstate.h"

#ifndef	lint
static const char ID_sccs[] = "@(#)cfm.c	2.18 98/10/06 (C) SK " ;
#endif

/*
 * FSM Macros
 */
#define AFLAG	0x10
#define GO_STATE(x)	(smc->mib.fddiSMTCF_State = (x)|AFLAG)
#define ACTIONS_DONE()	(smc->mib.fddiSMTCF_State &= ~AFLAG)
#define ACTIONS(x)	(x|AFLAG)

/*
 * symbolic state names
 */
static const char * const cfm_states[] = {
	"SC0_ISOLATED","CF1","CF2","CF3","CF4",
	"SC1_WRAP_A","SC2_WRAP_B","SC5_TRHU_B","SC7_WRAP_S",
	"SC9_C_WRAP_A","SC10_C_WRAP_B","SC11_C_WRAP_S","SC4_THRU_A"
} ;

/*
 * symbolic event names
 */
static const char * const cfm_events[] = {
	"NONE","CF_LOOP_A","CF_LOOP_B","CF_JOIN_A","CF_JOIN_B"
} ;

/*
 * map from state to downstream port type
 */
static const unsigned char cf_to_ptype[] = {
	TNONE,TNONE,TNONE,TNONE,TNONE,
	TNONE,TB,TB,TS,
	TA,TB,TS,TB
} ;

/*
 * CEM port states
 */
#define	CEM_PST_DOWN	0
#define	CEM_PST_UP	1
#define	CEM_PST_HOLD	2
/* define portstate array only for A and B port */
/* Do this within the smc structure (use in multiple cards) */

/*
 * all Globals  are defined in smc.h
 * struct s_cfm
 */

/*
 * function declarations
 */
static void cfm_fsm(struct s_smc *smc, int cmd);

/*
	init CFM state machine
	clear all CFM vars and flags
*/
void cfm_init(struct s_smc *smc)
{
	smc->mib.fddiSMTCF_State = ACTIONS(SC0_ISOLATED) ;
	smc->r.rm_join = 0 ;
	smc->r.rm_loop = 0 ;
	smc->y[PA].scrub = 0 ;
	smc->y[PB].scrub = 0 ;
	smc->y[PA].cem_pst = CEM_PST_DOWN ;
	smc->y[PB].cem_pst = CEM_PST_DOWN ;
}

/* Some terms conditions used by the selection criteria */
#define THRU_ENABLED(smc)	(smc->y[PA].pc_mode != PM_TREE && \
				 smc->y[PB].pc_mode != PM_TREE)
/* Selection criteria for the ports */
static void selection_criteria (struct s_smc *smc, struct s_phy *phy)
{

	switch (phy->mib->fddiPORTMy_Type) {
	case TA:
		if ( !THRU_ENABLED(smc) && smc->y[PB].cf_join ) {
			phy->wc_flag = TRUE ;
		} else {
			phy->wc_flag = FALSE ;
		}

		break;
	case TB:
		/* take precedence over PA */
		phy->wc_flag = FALSE ;
		break;
	case TS:
		phy->wc_flag = FALSE ;
		break;
	case TM:
		phy->wc_flag = FALSE ;
		break;
	}

}

void all_selection_criteria(struct s_smc *smc)
{
	struct s_phy	*phy ;
	int		p ;

	for ( p = 0,phy = smc->y ; p < NUMPHYS; p++, phy++ ) {
		/* Do the selection criteria */
		selection_criteria (smc,phy);
	}
}

static void cem_priv_state(struct s_smc *smc, int event)
/* State machine for private PORT states: used to optimize dual homing */
{
	int	np;	/* Number of the port */
	int	i;

	/* Do this only in a DAS */
	if (smc->s.sas != SMT_DAS )
		return ;

	np = event - CF_JOIN;

	if (np != PA && np != PB) {
		return ;
	}
	/* Change the port state according to the event (portnumber) */
	if (smc->y[np].cf_join) {
		smc->y[np].cem_pst = CEM_PST_UP ;
	} else if (!smc->y[np].wc_flag) {
		/* set the port to done only if it is not withheld */
		smc->y[np].cem_pst = CEM_PST_DOWN ;
	}

	/* Don't set an hold port to down */

	/* Check all ports of restart conditions */
	for (i = 0 ; i < 2 ; i ++ ) {
		/* Check all port for PORT is on hold and no withhold is done */
		if ( smc->y[i].cem_pst == CEM_PST_HOLD && !smc->y[i].wc_flag ) {
			smc->y[i].cem_pst = CEM_PST_DOWN;
			queue_event(smc,(int)(EVENT_PCM+i),PC_START) ;
		}
		if ( smc->y[i].cem_pst == CEM_PST_UP && smc->y[i].wc_flag ) {
			smc->y[i].cem_pst = CEM_PST_HOLD;
			queue_event(smc,(int)(EVENT_PCM+i),PC_START) ;
		}
		if ( smc->y[i].cem_pst == CEM_PST_DOWN && smc->y[i].wc_flag ) {
			/*
			 * The port must be restarted when the wc_flag
			 * will be reset. So set the port on hold.
			 */
			smc->y[i].cem_pst = CEM_PST_HOLD;
		}
	}
	return ;
}

/*
	CFM state machine
	called by dispatcher

	do
		display state change
		process event
	until SM is stable
*/
void cfm(struct s_smc *smc, int event)
{
	int	state ;		/* remember last state */
	int	cond ;
	int	oldstate ;

	/* We will do the following: */
	/*  - compute the variable WC_Flag for every port (This is where */
	/*    we can extend the requested path checking !!) */
	/*  - do the old (SMT 6.2 like) state machine */
	/*  - do the resulting station states */

	all_selection_criteria (smc);

	/* We will check now whether a state transition is allowed or not */
	/*  - change the portstates */
	cem_priv_state (smc, event);

	oldstate = smc->mib.fddiSMTCF_State ;
	do {
		DB_CFM("CFM : state %s%s event %s",
		       smc->mib.fddiSMTCF_State & AFLAG ? "ACTIONS " : "",
		       cfm_states[smc->mib.fddiSMTCF_State & ~AFLAG],
		       cfm_events[event]);
		state = smc->mib.fddiSMTCF_State ;
		cfm_fsm(smc,event) ;
		event = 0 ;
	} while (state != smc->mib.fddiSMTCF_State) ;

#ifndef	SLIM_SMT
	/*
	 * check peer wrap condition
	 */
	cond = FALSE ;
	if (	(smc->mib.fddiSMTCF_State == SC9_C_WRAP_A &&
		smc->y[PA].pc_mode == PM_PEER) 	||
		(smc->mib.fddiSMTCF_State == SC10_C_WRAP_B &&
		smc->y[PB].pc_mode == PM_PEER) 	||
		(smc->mib.fddiSMTCF_State == SC11_C_WRAP_S &&
		smc->y[PS].pc_mode == PM_PEER &&
		smc->y[PS].mib->fddiPORTNeighborType != TS ) ) {
			cond = TRUE ;
	}
	if (cond != smc->mib.fddiSMTPeerWrapFlag)
		smt_srf_event(smc,SMT_COND_SMT_PEER_WRAP,0,cond) ;

#if	0
	/*
	 * Don't send ever MAC_PATH_CHANGE events. Our MAC is hard-wired
	 * to the primary path.
	 */
	/*
	 * path change
	 */
	if (smc->mib.fddiSMTCF_State != oldstate) {
		smt_srf_event(smc,SMT_EVENT_MAC_PATH_CHANGE,INDEX_MAC,0) ;
	}
#endif
#endif	/* no SLIM_SMT */

	/*
	 * set MAC port type
	 */
	smc->mib.m[MAC0].fddiMACDownstreamPORTType =
		cf_to_ptype[smc->mib.fddiSMTCF_State] ;
	cfm_state_change(smc,(int)smc->mib.fddiSMTCF_State) ;
}

/*
	process CFM event
*/
/*ARGSUSED1*/
static void cfm_fsm(struct s_smc *smc, int cmd)
{
	switch(smc->mib.fddiSMTCF_State) {
	case ACTIONS(SC0_ISOLATED) :
		smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
		smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
		smc->mib.p[PA].fddiPORTMACPlacement = 0 ;
		smc->mib.p[PB].fddiPORTMACPlacement = 0 ;
		smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_SEPA ;
		config_mux(smc,MUX_ISOLATE) ;	/* configure PHY Mux */
		smc->r.rm_loop = FALSE ;
		smc->r.rm_join = FALSE ;
		queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
		/* Don't do the WC-Flag changing here */
		ACTIONS_DONE() ;
		DB_CFMN(1, "CFM : %s", cfm_states[smc->mib.fddiSMTCF_State]);
		break;
	case SC0_ISOLATED :
		/*SC07*/
		/*SAS port can be PA or PB ! */
		if (smc->s.sas && (smc->y[PA].cf_join || smc->y[PA].cf_loop ||
				smc->y[PB].cf_join || smc->y[PB].cf_loop)) {
			GO_STATE(SC11_C_WRAP_S) ;
			break ;
		}
		/*SC01*/
		if ((smc->y[PA].cem_pst == CEM_PST_UP && smc->y[PA].cf_join &&
		     !smc->y[PA].wc_flag) || smc->y[PA].cf_loop) {
			GO_STATE(SC9_C_WRAP_A) ;
			break ;
		}
		/*SC02*/
		if ((smc->y[PB].cem_pst == CEM_PST_UP && smc->y[PB].cf_join &&
		     !smc->y[PB].wc_flag) || smc->y[PB].cf_loop) {
			GO_STATE(SC10_C_WRAP_B) ;
			break ;
		}
		break ;
	case ACTIONS(SC9_C_WRAP_A) :
		smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_CONCATENATED ;
		smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
		smc->mib.p[PA].fddiPORTMACPlacement = INDEX_MAC ;
		smc->mib.p[PB].fddiPORTMACPlacement = 0 ;
		smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_CON ;
		config_mux(smc,MUX_WRAPA) ;		/* configure PHY mux */
		if (smc->y[PA].cf_loop) {
			smc->r.rm_join = FALSE ;
			smc->r.rm_loop = TRUE ;
			queue_event(smc,EVENT_RMT,RM_LOOP) ;/* signal RMT */
		}
		if (smc->y[PA].cf_join) {
			smc->r.rm_loop = FALSE ;
			smc->r.rm_join = TRUE ;
			queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
		}
		ACTIONS_DONE() ;
		DB_CFMN(1, "CFM : %s", cfm_states[smc->mib.fddiSMTCF_State]);
		break ;
	case SC9_C_WRAP_A :
		/*SC10*/
		if ( (smc->y[PA].wc_flag || !smc->y[PA].cf_join) &&
		      !smc->y[PA].cf_loop ) {
			GO_STATE(SC0_ISOLATED) ;
			break ;
		}
		/*SC12*/
		else if ( (smc->y[PB].cf_loop && smc->y[PA].cf_join &&
			   smc->y[PA].cem_pst == CEM_PST_UP) ||
			  ((smc->y[PB].cf_loop ||
			   (smc->y[PB].cf_join &&
			    smc->y[PB].cem_pst == CEM_PST_UP)) &&
			    (smc->y[PA].pc_mode == PM_TREE ||
			     smc->y[PB].pc_mode == PM_TREE))) {
			smc->y[PA].scrub = TRUE ;
			GO_STATE(SC10_C_WRAP_B) ;
			break ;
		}
		/*SC14*/
		else if (!smc->s.attach_s &&
			  smc->y[PA].cf_join &&
			  smc->y[PA].cem_pst == CEM_PST_UP &&
			  smc->y[PA].pc_mode == PM_PEER && smc->y[PB].cf_join &&
			  smc->y[PB].cem_pst == CEM_PST_UP &&
			  smc->y[PB].pc_mode == PM_PEER) {
			smc->y[PA].scrub = TRUE ;
			smc->y[PB].scrub = TRUE ;
			GO_STATE(SC4_THRU_A) ;
			break ;
		}
		/*SC15*/
		else if ( smc->s.attach_s &&
			  smc->y[PA].cf_join &&
			  smc->y[PA].cem_pst == CEM_PST_UP &&
			  smc->y[PA].pc_mode == PM_PEER &&
			  smc->y[PB].cf_join &&
			  smc->y[PB].cem_pst == CEM_PST_UP &&
			  smc->y[PB].pc_mode == PM_PEER) {
			smc->y[PA].scrub = TRUE ;
			smc->y[PB].scrub = TRUE ;
			GO_STATE(SC5_THRU_B) ;
			break ;
		}
		break ;
	case ACTIONS(SC10_C_WRAP_B) :
		smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
		smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_CONCATENATED ;
		smc->mib.p[PA].fddiPORTMACPlacement = 0 ;
		smc->mib.p[PB].fddiPORTMACPlacement = INDEX_MAC ;
		smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_CON ;
		config_mux(smc,MUX_WRAPB) ;		/* configure PHY mux */
		if (smc->y[PB].cf_loop) {
			smc->r.rm_join = FALSE ;
			smc->r.rm_loop = TRUE ;
			queue_event(smc,EVENT_RMT,RM_LOOP) ;/* signal RMT */
		}
		if (smc->y[PB].cf_join) {
			smc->r.rm_loop = FALSE ;
			smc->r.rm_join = TRUE ;
			queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
		}
		ACTIONS_DONE() ;
		DB_CFMN(1, "CFM : %s", cfm_states[smc->mib.fddiSMTCF_State]);
		break ;
	case SC10_C_WRAP_B :
		/*SC20*/
		if ( !smc->y[PB].cf_join && !smc->y[PB].cf_loop ) {
			GO_STATE(SC0_ISOLATED) ;
			break ;
		}
		/*SC21*/
		else if ( smc->y[PA].cf_loop && smc->y[PA].pc_mode == PM_PEER &&
			  smc->y[PB].cf_join && smc->y[PB].pc_mode == PM_PEER) {
			smc->y[PB].scrub = TRUE ;
			GO_STATE(SC9_C_WRAP_A) ;
			break ;
		}
		/*SC24*/
		else if (!smc->s.attach_s &&
			 smc->y[PA].cf_join && smc->y[PA].pc_mode == PM_PEER &&
			 smc->y[PB].cf_join && smc->y[PB].pc_mode == PM_PEER) {
			smc->y[PA].scrub = TRUE ;
			smc->y[PB].scrub = TRUE ;
			GO_STATE(SC4_THRU_A) ;
			break ;
		}
		/*SC25*/
		else if ( smc->s.attach_s &&
			 smc->y[PA].cf_join && smc->y[PA].pc_mode == PM_PEER &&
			 smc->y[PB].cf_join && smc->y[PB].pc_mode == PM_PEER) {
			smc->y[PA].scrub = TRUE ;
			smc->y[PB].scrub = TRUE ;
			GO_STATE(SC5_THRU_B) ;
			break ;
		}
		break ;
	case ACTIONS(SC4_THRU_A) :
		smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_THRU ;
		smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_THRU ;
		smc->mib.p[PA].fddiPORTMACPlacement = 0 ;
		smc->mib.p[PB].fddiPORTMACPlacement = INDEX_MAC ;
		smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_THRU ;
		config_mux(smc,MUX_THRUA) ;		/* configure PHY mux */
		smc->r.rm_loop = FALSE ;
		smc->r.rm_join = TRUE ;
		queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
		ACTIONS_DONE() ;
		DB_CFMN(1, "CFM : %s", cfm_states[smc->mib.fddiSMTCF_State]);
		break ;
	case SC4_THRU_A :
		/*SC41*/
		if (smc->y[PB].wc_flag || !smc->y[PB].cf_join) {
			smc->y[PA].scrub = TRUE ;
			GO_STATE(SC9_C_WRAP_A) ;
			break ;
		}
		/*SC42*/
		else if (!smc->y[PA].cf_join || smc->y[PA].wc_flag) {
			smc->y[PB].scrub = TRUE ;
			GO_STATE(SC10_C_WRAP_B) ;
			break ;
		}
		/*SC45*/
		else if (smc->s.attach_s) {
			smc->y[PB].scrub = TRUE ;
			GO_STATE(SC5_THRU_B) ;
			break ;
		}
		break ;
	case ACTIONS(SC5_THRU_B) :
		smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_THRU ;
		smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_THRU ;
		smc->mib.p[PA].fddiPORTMACPlacement = INDEX_MAC ;
		smc->mib.p[PB].fddiPORTMACPlacement = 0 ;
		smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_THRU ;
		config_mux(smc,MUX_THRUB) ;		/* configure PHY mux */
		smc->r.rm_loop = FALSE ;
		smc->r.rm_join = TRUE ;
		queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
		ACTIONS_DONE() ;
		DB_CFMN(1, "CFM : %s", cfm_states[smc->mib.fddiSMTCF_State]);
		break ;
	case SC5_THRU_B :
		/*SC51*/
		if (!smc->y[PB].cf_join || smc->y[PB].wc_flag) {
			smc->y[PA].scrub = TRUE ;
			GO_STATE(SC9_C_WRAP_A) ;
			break ;
		}
		/*SC52*/
		else if (!smc->y[PA].cf_join || smc->y[PA].wc_flag) {
			smc->y[PB].scrub = TRUE ;
			GO_STATE(SC10_C_WRAP_B) ;
			break ;
		}
		/*SC54*/
		else if (!smc->s.attach_s) {
			smc->y[PA].scrub = TRUE ;
			GO_STATE(SC4_THRU_A) ;
			break ;
		}
		break ;
	case ACTIONS(SC11_C_WRAP_S) :
		smc->mib.p[PS].fddiPORTCurrentPath = MIB_PATH_CONCATENATED ;
		smc->mib.p[PS].fddiPORTMACPlacement = INDEX_MAC ;
		smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_CON ;
		config_mux(smc,MUX_WRAPS) ;		/* configure PHY mux */
		if (smc->y[PA].cf_loop || smc->y[PB].cf_loop) {
			smc->r.rm_join = FALSE ;
			smc->r.rm_loop = TRUE ;
			queue_event(smc,EVENT_RMT,RM_LOOP) ;/* signal RMT */
		}
		if (smc->y[PA].cf_join || smc->y[PB].cf_join) {
			smc->r.rm_loop = FALSE ;
			smc->r.rm_join = TRUE ;
			queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
		}
		ACTIONS_DONE() ;
		DB_CFMN(1, "CFM : %s", cfm_states[smc->mib.fddiSMTCF_State]);
		break ;
	case SC11_C_WRAP_S :
		/*SC70*/
		if ( !smc->y[PA].cf_join && !smc->y[PA].cf_loop &&
		     !smc->y[PB].cf_join && !smc->y[PB].cf_loop) {
			GO_STATE(SC0_ISOLATED) ;
			break ;
		}
		break ;
	default:
		SMT_PANIC(smc,SMT_E0106, SMT_E0106_MSG) ;
		break;
	}
}

/*
 * get MAC's input Port
 *	return :
 *		PA or PB
 */
int cfm_get_mac_input(struct s_smc *smc)
{
	return (smc->mib.fddiSMTCF_State == SC10_C_WRAP_B ||
		smc->mib.fddiSMTCF_State == SC5_THRU_B) ? PB : PA;
}

/*
 * get MAC's output Port
 *	return :
 *		PA or PB
 */
int cfm_get_mac_output(struct s_smc *smc)
{
	return (smc->mib.fddiSMTCF_State == SC10_C_WRAP_B ||
		smc->mib.fddiSMTCF_State == SC4_THRU_A) ? PB : PA;
}

static char path_iso[] = {
	0,0,	0,RES_PORT,	0,PA + INDEX_PORT,	0,PATH_ISO,
	0,0,	0,RES_MAC,	0,INDEX_MAC,		0,PATH_ISO,
	0,0,	0,RES_PORT,	0,PB + INDEX_PORT,	0,PATH_ISO
} ;

static char path_wrap_a[] = {
	0,0,	0,RES_PORT,	0,PA + INDEX_PORT,	0,PATH_PRIM,
	0,0,	0,RES_MAC,	0,INDEX_MAC,		0,PATH_PRIM,
	0,0,	0,RES_PORT,	0,PB + INDEX_PORT,	0,PATH_ISO
} ;

static char path_wrap_b[] = {
	0,0,	0,RES_PORT,	0,PB + INDEX_PORT,	0,PATH_PRIM,
	0,0,	0,RES_MAC,	0,INDEX_MAC,		0,PATH_PRIM,
	0,0,	0,RES_PORT,	0,PA + INDEX_PORT,	0,PATH_ISO
} ;

static char path_thru[] = {
	0,0,	0,RES_PORT,	0,PA + INDEX_PORT,	0,PATH_PRIM,
	0,0,	0,RES_MAC,	0,INDEX_MAC,		0,PATH_PRIM,
	0,0,	0,RES_PORT,	0,PB + INDEX_PORT,	0,PATH_PRIM
} ;

static char path_wrap_s[] = {
	0,0,	0,RES_PORT,	0,PS + INDEX_PORT,	0,PATH_PRIM,
	0,0,	0,RES_MAC,	0,INDEX_MAC,		0,PATH_PRIM,
} ;

static char path_iso_s[] = {
	0,0,	0,RES_PORT,	0,PS + INDEX_PORT,	0,PATH_ISO,
	0,0,	0,RES_MAC,	0,INDEX_MAC,		0,PATH_ISO,
} ;

int cem_build_path(struct s_smc *smc, char *to, int path_index)
{
	char	*path ;
	int	len ;

	switch (smc->mib.fddiSMTCF_State) {
	default :
	case SC0_ISOLATED :
		path = smc->s.sas ? path_iso_s : path_iso ;
		len = smc->s.sas ? sizeof(path_iso_s) :  sizeof(path_iso) ;
		break ;
	case SC9_C_WRAP_A :
		path = path_wrap_a ;
		len = sizeof(path_wrap_a) ;
		break ;
	case SC10_C_WRAP_B :
		path = path_wrap_b ;
		len = sizeof(path_wrap_b) ;
		break ;
	case SC4_THRU_A :
		path = path_thru ;
		len = sizeof(path_thru) ;
		break ;
	case SC11_C_WRAP_S :
		path = path_wrap_s ;
		len = sizeof(path_wrap_s) ;
		break ;
	}
	memcpy(to,path,len) ;

	LINT_USE(path_index);

	return len;
}
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	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	*
1da177e4 LT	9	* The information in this file is provided "AS IS" without warranty.
	10	*
	11	******************************************************************************/
	12
	13	/*
	14	SMT CFM
	15	Configuration Management
	16	DAS with single MAC
	17	*/
	18
	19	/*
	20	* Hardware independent state machine implemantation
	21	* The following external SMT functions are referenced :
	22	*
	23	* queue_event()
	24	*
	25	* The following external HW dependent functions are referenced :
	26	* config_mux()
	27	*
	28	* The following HW dependent events are required :
	29	* NONE
	30	*/
	31
	32	#include "h/types.h"
	33	#include "h/fddi.h"
	34	#include "h/smc.h"
	35
	36	#define KERNEL
	37	#include "h/smtstate.h"
	38
	39	#ifndef lint
	40	static const char ID_sccs[] = "@(#)cfm.c 2.18 98/10/06 (C) SK " ;
	41	#endif
	42
	43	/*
	44	* FSM Macros
	45	*/
	46	#define AFLAG 0x10
	47	#define GO_STATE(x) (smc->mib.fddiSMTCF_State = (x)\|AFLAG)
	48	#define ACTIONS_DONE() (smc->mib.fddiSMTCF_State &= ~AFLAG)
	49	#define ACTIONS(x) (x\|AFLAG)
	50
1da177e4 LT	51	/*
	52	* symbolic state names
	53	*/
	54	static const char * const cfm_states[] = {
	55	"SC0_ISOLATED","CF1","CF2","CF3","CF4",
	56	"SC1_WRAP_A","SC2_WRAP_B","SC5_TRHU_B","SC7_WRAP_S",
	57	"SC9_C_WRAP_A","SC10_C_WRAP_B","SC11_C_WRAP_S","SC4_THRU_A"
	58	} ;
	59
	60	/*
	61	* symbolic event names
	62	*/
	63	static const char * const cfm_events[] = {
	64	"NONE","CF_LOOP_A","CF_LOOP_B","CF_JOIN_A","CF_JOIN_B"
	65	} ;
1da177e4 LT	66
	67	/*
	68	* map from state to downstream port type
	69	*/
b882addd	70	static const unsigned char cf_to_ptype[] = {
1da177e4 LT	71	TNONE,TNONE,TNONE,TNONE,TNONE,
	72	TNONE,TB,TB,TS,
	73	TA,TB,TS,TB
	74	} ;
	75
	76	/*
	77	* CEM port states
	78	*/
	79	#define CEM_PST_DOWN 0
	80	#define CEM_PST_UP 1
	81	#define CEM_PST_HOLD 2
	82	/* define portstate array only for A and B port */
	83	/* Do this within the smc structure (use in multiple cards) */
	84
	85	/*
	86	* all Globals are defined in smc.h
	87	* struct s_cfm
	88	*/
	89
	90	/*
	91	* function declarations
	92	*/
	93	static void cfm_fsm(struct s_smc *smc, int cmd);
	94
	95	/*
	96	init CFM state machine
	97	clear all CFM vars and flags
	98	*/
	99	void cfm_init(struct s_smc *smc)
	100	{
	101	smc->mib.fddiSMTCF_State = ACTIONS(SC0_ISOLATED) ;
	102	smc->r.rm_join = 0 ;
	103	smc->r.rm_loop = 0 ;
	104	smc->y[PA].scrub = 0 ;
	105	smc->y[PB].scrub = 0 ;
	106	smc->y[PA].cem_pst = CEM_PST_DOWN ;
	107	smc->y[PB].cem_pst = CEM_PST_DOWN ;
	108	}
	109
	110	/* Some terms conditions used by the selection criteria */
	111	#define THRU_ENABLED(smc) (smc->y[PA].pc_mode != PM_TREE && \
	112	smc->y[PB].pc_mode != PM_TREE)
	113	/* Selection criteria for the ports */
	114	static void selection_criteria (struct s_smc smc, struct s_phy phy)
	115	{
	116
	117	switch (phy->mib->fddiPORTMy_Type) {
	118	case TA:
	119	if ( !THRU_ENABLED(smc) && smc->y[PB].cf_join ) {
	120	phy->wc_flag = TRUE ;
	121	} else {
	122	phy->wc_flag = FALSE ;
	123	}
	124
	125	break;
	126	case TB:
	127	/* take precedence over PA */
	128	phy->wc_flag = FALSE ;
	129	break;
	130	case TS:
	131	phy->wc_flag = FALSE ;
	132	break;
	133	case TM:
	134	phy->wc_flag = FALSE ;
135	break;
136	}
137
138	}
139
140	void all_selection_criteria(struct s_smc *smc)
141	{
142	struct s_phy *phy ;
143	int p ;
144
145	for ( p = 0,phy = smc->y ; p < NUMPHYS; p++, phy++ ) {
146	/* Do the selection criteria */
147	selection_criteria (smc,phy);
148	}
149	}
150
151	static void cem_priv_state(struct s_smc *smc, int event)
152	/* State machine for private PORT states: used to optimize dual homing */
153	{
154	int np; /* Number of the port */
155	int i;
156
157	/* Do this only in a DAS */
158	if (smc->s.sas != SMT_DAS )
159	return ;
160
161	np = event - CF_JOIN;
162
163	if (np != PA && np != PB) {
164	return ;
165	}
166	/* Change the port state according to the event (portnumber) */
167	if (smc->y[np].cf_join) {
168	smc->y[np].cem_pst = CEM_PST_UP ;
169	} else if (!smc->y[np].wc_flag) {
170	/* set the port to done only if it is not withheld */
171	smc->y[np].cem_pst = CEM_PST_DOWN ;
172	}
173
174	/* Don't set an hold port to down */
175
176	/* Check all ports of restart conditions */
177	for (i = 0 ; i < 2 ; i ++ ) {
178	/* Check all port for PORT is on hold and no withhold is done */
179	if ( smc->y[i].cem_pst == CEM_PST_HOLD && !smc->y[i].wc_flag ) {
180	smc->y[i].cem_pst = CEM_PST_DOWN;
181	queue_event(smc,(int)(EVENT_PCM+i),PC_START) ;
182	}
183	if ( smc->y[i].cem_pst == CEM_PST_UP && smc->y[i].wc_flag ) {
184	smc->y[i].cem_pst = CEM_PST_HOLD;
185	queue_event(smc,(int)(EVENT_PCM+i),PC_START) ;
186	}
187	if ( smc->y[i].cem_pst == CEM_PST_DOWN && smc->y[i].wc_flag ) {
188	/*
189	* The port must be restarted when the wc_flag
190	* will be reset. So set the port on hold.
191	*/
192	smc->y[i].cem_pst = CEM_PST_HOLD;
193	}
194	}
195	return ;
196	}
197
198	/*
199	CFM state machine
200	called by dispatcher
201
202	do
203	display state change
204	process event
205	until SM is stable
206	*/
207	void cfm(struct s_smc *smc, int event)
208	{
209	int state ; /* remember last state */
210	int cond ;
211	int oldstate ;
212
213	/* We will do the following: */
214	/* - compute the variable WC_Flag for every port (This is where */
215	/* we can extend the requested path checking !!) */
216	/* - do the old (SMT 6.2 like) state machine */
217	/* - do the resulting station states */
218
219	all_selection_criteria (smc);
220
221	/* We will check now whether a state transition is allowed or not */
222	/* - change the portstates */
223	cem_priv_state (smc, event);
224
225	oldstate = smc->mib.fddiSMTCF_State ;
226	do {
5671e8c1 JP	227	DB_CFM("CFM : state %s%s event %s",
	228	smc->mib.fddiSMTCF_State & AFLAG ? "ACTIONS " : "",
	229	cfm_states[smc->mib.fddiSMTCF_State & ~AFLAG],
	230	cfm_events[event]);
1da177e4 LT	231	state = smc->mib.fddiSMTCF_State ;
	232	cfm_fsm(smc,event) ;
	233	event = 0 ;
	234	} while (state != smc->mib.fddiSMTCF_State) ;
	235
	236	#ifndef SLIM_SMT
	237	/*
	238	* check peer wrap condition
	239	*/
	240	cond = FALSE ;
	241	if ( (smc->mib.fddiSMTCF_State == SC9_C_WRAP_A &&
	242	smc->y[PA].pc_mode == PM_PEER) \|\|
	243	(smc->mib.fddiSMTCF_State == SC10_C_WRAP_B &&
	244	smc->y[PB].pc_mode == PM_PEER) \|\|
	245	(smc->mib.fddiSMTCF_State == SC11_C_WRAP_S &&
	246	smc->y[PS].pc_mode == PM_PEER &&
	247	smc->y[PS].mib->fddiPORTNeighborType != TS ) ) {
	248	cond = TRUE ;
	249	}
	250	if (cond != smc->mib.fddiSMTPeerWrapFlag)
	251	smt_srf_event(smc,SMT_COND_SMT_PEER_WRAP,0,cond) ;
	252
	253	#if 0
	254	/*
	255	* Don't send ever MAC_PATH_CHANGE events. Our MAC is hard-wired
	256	* to the primary path.
	257	*/
	258	/*
	259	* path change
	260	*/
	261	if (smc->mib.fddiSMTCF_State != oldstate) {
	262	smt_srf_event(smc,SMT_EVENT_MAC_PATH_CHANGE,INDEX_MAC,0) ;
	263	}
	264	#endif
	265	#endif /* no SLIM_SMT */
	266
	267	/*
	268	* set MAC port type
	269	*/
	270	smc->mib.m[MAC0].fddiMACDownstreamPORTType =
	271	cf_to_ptype[smc->mib.fddiSMTCF_State] ;
	272	cfm_state_change(smc,(int)smc->mib.fddiSMTCF_State) ;
	273	}
	274
	275	/*
	276	process CFM event
	277	*/
	278	/ARGSUSED1/
	279	static void cfm_fsm(struct s_smc *smc, int cmd)
	280	{
	281	switch(smc->mib.fddiSMTCF_State) {
	282	case ACTIONS(SC0_ISOLATED) :
	283	smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
	284	smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
	285	smc->mib.p[PA].fddiPORTMACPlacement = 0 ;
	286	smc->mib.p[PB].fddiPORTMACPlacement = 0 ;
	287	smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_SEPA ;
	288	config_mux(smc,MUX_ISOLATE) ; /* configure PHY Mux */
	289	smc->r.rm_loop = FALSE ;
	290	smc->r.rm_join = FALSE ;
	291	queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
	292	/* Don't do the WC-Flag changing here */
	293	ACTIONS_DONE() ;
5671e8c1	294	DB_CFMN(1, "CFM : %s", cfm_states[smc->mib.fddiSMTCF_State]);
1da177e4 LT	295	break;
	296	case SC0_ISOLATED :
	297	/SC07/
	298	/SAS port can be PA or PB ! /
	299	if (smc->s.sas && (smc->y[PA].cf_join \|\| smc->y[PA].cf_loop \|\|
	300	smc->y[PB].cf_join \|\| smc->y[PB].cf_loop)) {
	301	GO_STATE(SC11_C_WRAP_S) ;
	302	break ;
	303	}
	304	/SC01/
	305	if ((smc->y[PA].cem_pst == CEM_PST_UP && smc->y[PA].cf_join &&
	306	!smc->y[PA].wc_flag) \|\| smc->y[PA].cf_loop) {
	307	GO_STATE(SC9_C_WRAP_A) ;
	308	break ;
	309	}
	310	/SC02/
	311	if ((smc->y[PB].cem_pst == CEM_PST_UP && smc->y[PB].cf_join &&
	312	!smc->y[PB].wc_flag) \|\| smc->y[PB].cf_loop) {
	313	GO_STATE(SC10_C_WRAP_B) ;
	314	break ;
	315	}
	316	break ;
	317	case ACTIONS(SC9_C_WRAP_A) :
	318	smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_CONCATENATED ;
	319	smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
	320	smc->mib.p[PA].fddiPORTMACPlacement = INDEX_MAC ;
	321	smc->mib.p[PB].fddiPORTMACPlacement = 0 ;
	322	smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_CON ;
	323	config_mux(smc,MUX_WRAPA) ; /* configure PHY mux */
	324	if (smc->y[PA].cf_loop) {
	325	smc->r.rm_join = FALSE ;
	326	smc->r.rm_loop = TRUE ;
	327	queue_event(smc,EVENT_RMT,RM_LOOP) ;/* signal RMT */
	328	}
	329	if (smc->y[PA].cf_join) {
	330	smc->r.rm_loop = FALSE ;
	331	smc->r.rm_join = TRUE ;
	332	queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
	333	}
	334	ACTIONS_DONE() ;
5671e8c1	335	DB_CFMN(1, "CFM : %s", cfm_states[smc->mib.fddiSMTCF_State]);
1da177e4 LT	336	break ;
	337	case SC9_C_WRAP_A :
	338	/SC10/
	339	if ( (smc->y[PA].wc_flag \|\| !smc->y[PA].cf_join) &&
	340	!smc->y[PA].cf_loop ) {
	341	GO_STATE(SC0_ISOLATED) ;
	342	break ;
	343	}
	344	/SC12/
	345	else if ( (smc->y[PB].cf_loop && smc->y[PA].cf_join &&
	346	smc->y[PA].cem_pst == CEM_PST_UP) \|\|
	347	((smc->y[PB].cf_loop \|\|
	348	(smc->y[PB].cf_join &&
	349	smc->y[PB].cem_pst == CEM_PST_UP)) &&
	350	(smc->y[PA].pc_mode == PM_TREE \|\|
	351	smc->y[PB].pc_mode == PM_TREE))) {
	352	smc->y[PA].scrub = TRUE ;
	353	GO_STATE(SC10_C_WRAP_B) ;
	354	break ;
	355	}
	356	/SC14/
	357	else if (!smc->s.attach_s &&
	358	smc->y[PA].cf_join &&
	359	smc->y[PA].cem_pst == CEM_PST_UP &&
	360	smc->y[PA].pc_mode == PM_PEER && smc->y[PB].cf_join &&
	361	smc->y[PB].cem_pst == CEM_PST_UP &&
	362	smc->y[PB].pc_mode == PM_PEER) {
	363	smc->y[PA].scrub = TRUE ;
	364	smc->y[PB].scrub = TRUE ;
	365	GO_STATE(SC4_THRU_A) ;
	366	break ;
	367	}
	368	/SC15/
	369	else if ( smc->s.attach_s &&
	370	smc->y[PA].cf_join &&
	371	smc->y[PA].cem_pst == CEM_PST_UP &&
	372	smc->y[PA].pc_mode == PM_PEER &&
	373	smc->y[PB].cf_join &&
	374	smc->y[PB].cem_pst == CEM_PST_UP &&
	375	smc->y[PB].pc_mode == PM_PEER) {
	376	smc->y[PA].scrub = TRUE ;
	377	smc->y[PB].scrub = TRUE ;
	378	GO_STATE(SC5_THRU_B) ;
	379	break ;
	380	}
	381	break ;
	382	case ACTIONS(SC10_C_WRAP_B) :
	383	smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_ISOLATED ;
	384	smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_CONCATENATED ;
	385	smc->mib.p[PA].fddiPORTMACPlacement = 0 ;
	386	smc->mib.p[PB].fddiPORTMACPlacement = INDEX_MAC ;
	387	smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_CON ;
	388	config_mux(smc,MUX_WRAPB) ; /* configure PHY mux */
	389	if (smc->y[PB].cf_loop) {
	390	smc->r.rm_join = FALSE ;
	391	smc->r.rm_loop = TRUE ;
	392	queue_event(smc,EVENT_RMT,RM_LOOP) ;/* signal RMT */
	393	}
	394	if (smc->y[PB].cf_join) {
	395	smc->r.rm_loop = FALSE ;
	396	smc->r.rm_join = TRUE ;
	397	queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
	398	}
	399	ACTIONS_DONE() ;
5671e8c1	400	DB_CFMN(1, "CFM : %s", cfm_states[smc->mib.fddiSMTCF_State]);
1da177e4 LT	401	break ;
	402	case SC10_C_WRAP_B :
	403	/SC20/
	404	if ( !smc->y[PB].cf_join && !smc->y[PB].cf_loop ) {
	405	GO_STATE(SC0_ISOLATED) ;
	406	break ;
	407	}
	408	/SC21/
	409	else if ( smc->y[PA].cf_loop && smc->y[PA].pc_mode == PM_PEER &&
	410	smc->y[PB].cf_join && smc->y[PB].pc_mode == PM_PEER) {
	411	smc->y[PB].scrub = TRUE ;
	412	GO_STATE(SC9_C_WRAP_A) ;
	413	break ;
	414	}
	415	/SC24/
	416	else if (!smc->s.attach_s &&
	417	smc->y[PA].cf_join && smc->y[PA].pc_mode == PM_PEER &&
	418	smc->y[PB].cf_join && smc->y[PB].pc_mode == PM_PEER) {
	419	smc->y[PA].scrub = TRUE ;
	420	smc->y[PB].scrub = TRUE ;
	421	GO_STATE(SC4_THRU_A) ;
	422	break ;
	423	}
	424	/SC25/
	425	else if ( smc->s.attach_s &&
	426	smc->y[PA].cf_join && smc->y[PA].pc_mode == PM_PEER &&
	427	smc->y[PB].cf_join && smc->y[PB].pc_mode == PM_PEER) {
	428	smc->y[PA].scrub = TRUE ;
	429	smc->y[PB].scrub = TRUE ;
	430	GO_STATE(SC5_THRU_B) ;
	431	break ;
	432	}
	433	break ;
	434	case ACTIONS(SC4_THRU_A) :
	435	smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_THRU ;
	436	smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_THRU ;
	437	smc->mib.p[PA].fddiPORTMACPlacement = 0 ;
	438	smc->mib.p[PB].fddiPORTMACPlacement = INDEX_MAC ;
	439	smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_THRU ;
	440	config_mux(smc,MUX_THRUA) ; /* configure PHY mux */
	441	smc->r.rm_loop = FALSE ;
	442	smc->r.rm_join = TRUE ;
	443	queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
	444	ACTIONS_DONE() ;
5671e8c1	445	DB_CFMN(1, "CFM : %s", cfm_states[smc->mib.fddiSMTCF_State]);
1da177e4 LT	446	break ;
	447	case SC4_THRU_A :
	448	/SC41/
	449	if (smc->y[PB].wc_flag \|\| !smc->y[PB].cf_join) {
	450	smc->y[PA].scrub = TRUE ;
	451	GO_STATE(SC9_C_WRAP_A) ;
	452	break ;
	453	}
	454	/SC42/
	455	else if (!smc->y[PA].cf_join \|\| smc->y[PA].wc_flag) {
	456	smc->y[PB].scrub = TRUE ;
	457	GO_STATE(SC10_C_WRAP_B) ;
	458	break ;
	459	}
	460	/SC45/
	461	else if (smc->s.attach_s) {
	462	smc->y[PB].scrub = TRUE ;
	463	GO_STATE(SC5_THRU_B) ;
	464	break ;
	465	}
	466	break ;
	467	case ACTIONS(SC5_THRU_B) :
	468	smc->mib.p[PA].fddiPORTCurrentPath = MIB_PATH_THRU ;
	469	smc->mib.p[PB].fddiPORTCurrentPath = MIB_PATH_THRU ;
	470	smc->mib.p[PA].fddiPORTMACPlacement = INDEX_MAC ;
	471	smc->mib.p[PB].fddiPORTMACPlacement = 0 ;
	472	smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_THRU ;
	473	config_mux(smc,MUX_THRUB) ; /* configure PHY mux */
	474	smc->r.rm_loop = FALSE ;
	475	smc->r.rm_join = TRUE ;
	476	queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
	477	ACTIONS_DONE() ;
5671e8c1	478	DB_CFMN(1, "CFM : %s", cfm_states[smc->mib.fddiSMTCF_State]);
1da177e4 LT	479	break ;
	480	case SC5_THRU_B :
	481	/SC51/
	482	if (!smc->y[PB].cf_join \|\| smc->y[PB].wc_flag) {
	483	smc->y[PA].scrub = TRUE ;
	484	GO_STATE(SC9_C_WRAP_A) ;
	485	break ;
	486	}
	487	/SC52/
	488	else if (!smc->y[PA].cf_join \|\| smc->y[PA].wc_flag) {
	489	smc->y[PB].scrub = TRUE ;
	490	GO_STATE(SC10_C_WRAP_B) ;
	491	break ;
	492	}
	493	/SC54/
	494	else if (!smc->s.attach_s) {
	495	smc->y[PA].scrub = TRUE ;
	496	GO_STATE(SC4_THRU_A) ;
	497	break ;
	498	}
	499	break ;
	500	case ACTIONS(SC11_C_WRAP_S) :
	501	smc->mib.p[PS].fddiPORTCurrentPath = MIB_PATH_CONCATENATED ;
	502	smc->mib.p[PS].fddiPORTMACPlacement = INDEX_MAC ;
	503	smc->mib.fddiSMTStationStatus = MIB_SMT_STASTA_CON ;
	504	config_mux(smc,MUX_WRAPS) ; /* configure PHY mux */
	505	if (smc->y[PA].cf_loop \|\| smc->y[PB].cf_loop) {
	506	smc->r.rm_join = FALSE ;
	507	smc->r.rm_loop = TRUE ;
	508	queue_event(smc,EVENT_RMT,RM_LOOP) ;/* signal RMT */
	509	}
	510	if (smc->y[PA].cf_join \|\| smc->y[PB].cf_join) {
	511	smc->r.rm_loop = FALSE ;
	512	smc->r.rm_join = TRUE ;
	513	queue_event(smc,EVENT_RMT,RM_JOIN) ;/* signal RMT */
	514	}
	515	ACTIONS_DONE() ;
5671e8c1	516	DB_CFMN(1, "CFM : %s", cfm_states[smc->mib.fddiSMTCF_State]);
1da177e4 LT	517	break ;
	518	case SC11_C_WRAP_S :
	519	/SC70/
	520	if ( !smc->y[PA].cf_join && !smc->y[PA].cf_loop &&
	521	!smc->y[PB].cf_join && !smc->y[PB].cf_loop) {
	522	GO_STATE(SC0_ISOLATED) ;
	523	break ;
	524	}
	525	break ;
	526	default:
	527	SMT_PANIC(smc,SMT_E0106, SMT_E0106_MSG) ;
	528	break;
	529	}
	530	}
	531
	532	/*
	533	* get MAC's input Port
	534	* return :
	535	* PA or PB
	536	*/
	537	int cfm_get_mac_input(struct s_smc *smc)
	538	{
807540ba ED	539	return (smc->mib.fddiSMTCF_State == SC10_C_WRAP_B \|\|
807540ba ED	540	smc->mib.fddiSMTCF_State == SC5_THRU_B) ? PB : PA;
1da177e4 LT	541	}
	542
	543	/*
	544	* get MAC's output Port
	545	* return :
	546	* PA or PB
	547	*/
	548	int cfm_get_mac_output(struct s_smc *smc)
	549	{
807540ba ED	550	return (smc->mib.fddiSMTCF_State == SC10_C_WRAP_B \|\|
807540ba ED	551	smc->mib.fddiSMTCF_State == SC4_THRU_A) ? PB : PA;
1da177e4 LT	552	}
	553
	554	static char path_iso[] = {
	555	0,0, 0,RES_PORT, 0,PA + INDEX_PORT, 0,PATH_ISO,
	556	0,0, 0,RES_MAC, 0,INDEX_MAC, 0,PATH_ISO,
	557	0,0, 0,RES_PORT, 0,PB + INDEX_PORT, 0,PATH_ISO
	558	} ;
	559
	560	static char path_wrap_a[] = {
	561	0,0, 0,RES_PORT, 0,PA + INDEX_PORT, 0,PATH_PRIM,
	562	0,0, 0,RES_MAC, 0,INDEX_MAC, 0,PATH_PRIM,
	563	0,0, 0,RES_PORT, 0,PB + INDEX_PORT, 0,PATH_ISO
	564	} ;
	565
	566	static char path_wrap_b[] = {
	567	0,0, 0,RES_PORT, 0,PB + INDEX_PORT, 0,PATH_PRIM,
	568	0,0, 0,RES_MAC, 0,INDEX_MAC, 0,PATH_PRIM,
	569	0,0, 0,RES_PORT, 0,PA + INDEX_PORT, 0,PATH_ISO
	570	} ;
	571
	572	static char path_thru[] = {
	573	0,0, 0,RES_PORT, 0,PA + INDEX_PORT, 0,PATH_PRIM,
	574	0,0, 0,RES_MAC, 0,INDEX_MAC, 0,PATH_PRIM,
	575	0,0, 0,RES_PORT, 0,PB + INDEX_PORT, 0,PATH_PRIM
	576	} ;
	577
	578	static char path_wrap_s[] = {
	579	0,0, 0,RES_PORT, 0,PS + INDEX_PORT, 0,PATH_PRIM,
	580	0,0, 0,RES_MAC, 0,INDEX_MAC, 0,PATH_PRIM,
	581	} ;
	582
	583	static char path_iso_s[] = {
	584	0,0, 0,RES_PORT, 0,PS + INDEX_PORT, 0,PATH_ISO,
	585	0,0, 0,RES_MAC, 0,INDEX_MAC, 0,PATH_ISO,
	586	} ;
	587
	588	int cem_build_path(struct s_smc smc, char to, int path_index)
	589	{
	590	char *path ;
	591	int len ;
	592
	593	switch (smc->mib.fddiSMTCF_State) {
	594	default :
	595	case SC0_ISOLATED :
	596	path = smc->s.sas ? path_iso_s : path_iso ;
	597	len = smc->s.sas ? sizeof(path_iso_s) : sizeof(path_iso) ;
	598	break ;
	599	case SC9_C_WRAP_A :
	600	path = path_wrap_a ;
	601	len = sizeof(path_wrap_a) ;
	602	break ;
	603	case SC10_C_WRAP_B :
	604	path = path_wrap_b ;
	605	len = sizeof(path_wrap_b) ;
	606	break ;
	607	case SC4_THRU_A :
	608	path = path_thru ;
	609	len = sizeof(path_thru) ;
	610	break ;
	611	case SC11_C_WRAP_S :
	612	path = path_wrap_s ;
	613	len = sizeof(path_wrap_s) ;
	614	break ;
	615	}
616	memcpy(to,path,len) ;
617
618	LINT_USE(path_index);
619
807540ba	620	return len;
1da177e4	621	}