patch-2.2.18 linux/drivers/net/skfp/cfm.c

• Lines: 643
• Date: Fri Sep 1 13:48:23 2000
• Orig file: v2.2.17/drivers/net/skfp/cfm.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/net/skfp/cfm.c linux/drivers/net/skfp/cfm.c
@@ -0,0 +1,642 @@
+/******************************************************************************
+ *
+ *	(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 CFM
+	Configuration Management
+	DAS with single MAC
+*/
+
+/*
+ *	Hardware independant state machine implemantation
+ *	The following external SMT functions are referenced :
+ *
+ *		queue_event()
+ *
+ *	The following external HW dependant functions are referenced :
+ *		config_mux()
+ *
+ *	The following HW dependant 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)
+
+#ifdef	DEBUG
+/*
+ * 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"
+} ;
+#endif
+
+/*
+ * map from state to downstream port type
+ */
+static const u_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() ;
+
+/*
+	init CFM state machine
+	clear all CFM vars and flags
+*/
+void cfm_init(smc)
+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 (smc,phy)
+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 (smc)
+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 (smc, event)
+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(smc,event)
+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",
+			(smc->mib.fddiSMTCF_State & AFLAG) ? "ACTIONS " : "",
+			cfm_states[smc->mib.fddiSMTCF_State & ~AFLAG]) ;
+		DB_CFM(" event %s\n",cfm_events[event],0) ;
+		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(smc,cmd)
+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\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
+		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\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
+		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\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
+		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\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
+		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\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
+		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\n",cfm_states[smc->mib.fddiSMTCF_State],0) ;
+		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(smc)
+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(smc)
+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(smc,to,path_index)
+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) ;
+}