smt.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

/******************************************************************************
 *
 *	(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.
 *
 ******************************************************************************/

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

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

#ifndef	lint
static const char ID_sccs[] = "@(#)smt.c	2.43 98/11/23 (C) SK " ;
#endif

extern const u_char canonical[256] ;

/*
 * FC in SMbuf
 */
#define m_fc(mb)	((mb)->sm_data[0])

#define SMT_TID_MAGIC	0x1f0a7b3c

#ifdef	DEBUG
static const char *const smt_type_name[] = {
	"SMT_00??", "SMT_INFO", "SMT_02??", "SMT_03??",
	"SMT_04??", "SMT_05??", "SMT_06??", "SMT_07??",
	"SMT_08??", "SMT_09??", "SMT_0A??", "SMT_0B??",
	"SMT_0C??", "SMT_0D??", "SMT_0E??", "SMT_NSA"
} ;

static const char *const smt_class_name[] = {
	"UNKNOWN","NIF","SIF_CONFIG","SIF_OPER","ECF","RAF","RDF",
	"SRF","PMF_GET","PMF_SET","ESF"
} ;
#endif
#define LAST_CLASS	(SMT_PMF_SET)

static const struct fddi_addr SMT_Unknown = {
	{ 0,0,0x1f,0,0,0 }
} ;

/*
 * external variables
 */
extern const struct fddi_addr fddi_broadcast ;

/*
 * external functions
 */
int pcm_status_twisted() ;
void pcm_status_state() ;
int pcm_status_type() ;

extern SMbuf *smt_get_mbuf() ;

#define EXPORT_PMF
/*
 * function prototypes
 */
u_long smt_get_tid() ;
EXPORT_PMF SMbuf *smt_build_frame() ;
EXPORT_PMF void *sm_to_para() ;
#ifdef	LITTLE_ENDIAN
static int smt_swap_short() ;
#endif
static int mac_index() ;
static int phy_index() ;
static int mac_con_resource_index() ;
static int phy_con_resource_index() ;
EXPORT_PMF void smt_send_frame() ;
EXPORT_PMF void smt_set_timestamp() ;
static void smt_send_rdf() ;
static void smt_send_nif() ;
static void smt_send_ecf() ;
static void smt_echo_test() ;
static void smt_send_sif_config() ;
static void smt_send_sif_operation() ;
EXPORT_PMF void smt_swap_para() ;
#ifdef LITTLE_ENDIAN
static void smt_string_swap() ;
#endif
static void smt_add_frame_len() ;
static void smt_fill_una() ;
static void smt_fill_sde() ;
static void smt_fill_state() ;
static void smt_fill_timestamp() ;
static void smt_fill_policy() ;
static void smt_fill_latency() ;
static void smt_fill_neighbor() ;
static int  smt_fill_path() ;
static void smt_fill_mac_status() ;
static void smt_fill_lem() ;
static void smt_fill_version() ;
static void smt_fill_fsc() ;
static void smt_fill_mac_counter() ;
static void smt_fill_mac_fnc() ;
static void smt_fill_manufacturer() ;
static void smt_fill_user() ;
static void smt_fill_setcount() ;
static void smt_fill_echo() ;
int smt_check_para() ;

void smt_clear_una_dna() ;
static void smt_clear_old_una_dna() ;
#ifdef	CONCENTRATOR
static int entity_to_index() ;
#endif
static void update_dac() ;
static int div_ratio() ;
#ifdef  USE_CAN_ADDR
void	hwm_conv_can() ;
#else
#define		hwm_conv_can(smc,data,len)
#endif

/*
 * list of mandatory paras in frames
 */
static const u_short plist_nif[] = { SMT_P_UNA,SMT_P_SDE,SMT_P_STATE,0 } ;

/*
 * init SMT agent
 */
void smt_agent_init(smc)
struct s_smc *smc ;
{
	int		i ;

	/*
	 * get MAC address
	 */
	smc->mib.m[MAC0].fddiMACSMTAddress = smc->hw.fddi_home_addr ;

	/*
	 * get OUI address from driver (bia == built-in-address)
	 */
	smc->mib.fddiSMTStationId.sid_oem[0] = 0 ;
	smc->mib.fddiSMTStationId.sid_oem[1] = 0 ;
	driver_get_bia(smc,&smc->mib.fddiSMTStationId.sid_node) ;
	for (i = 0 ; i < 6 ; i ++) {
		smc->mib.fddiSMTStationId.sid_node.a[i] =
			canonical[smc->mib.fddiSMTStationId.sid_node.a[i]] ;
	}
	smc->mib.fddiSMTManufacturerData[0] =
		smc->mib.fddiSMTStationId.sid_node.a[0] ;
	smc->mib.fddiSMTManufacturerData[1] =
		smc->mib.fddiSMTStationId.sid_node.a[1] ;
	smc->mib.fddiSMTManufacturerData[2] =
		smc->mib.fddiSMTStationId.sid_node.a[2] ;
	smc->sm.smt_tid = 0 ;
	smc->mib.m[MAC0].fddiMACDupAddressTest = DA_NONE ;
	smc->mib.m[MAC0].fddiMACUNDA_Flag = FALSE ;
#ifndef	SLIM_SMT
	smt_clear_una_dna(smc) ;
	smt_clear_old_una_dna(smc) ;
#endif
	for (i = 0 ; i < SMT_MAX_TEST ; i++)
		smc->sm.pend[i] = 0 ;
	smc->sm.please_reconnect = 0 ;
	smc->sm.uniq_ticks = 0 ;
}

/*
 * SMT task
 * forever
 *	delay 30 seconds
 *	send NIF
 *	check tvu & tvd
 * end
 */
void smt_agent_task(smc)
struct s_smc *smc ;
{
	smt_timer_start(smc,&smc->sm.smt_timer, (u_long)1000000L,
		EV_TOKEN(EVENT_SMT,SM_TIMER)) ;
	DB_SMT("SMT agent task\n",0,0) ;
}

void smt_please_reconnect(smc,reconn_time)
struct s_smc	*smc ;		/* Pointer to SMT context */
int		reconn_time ;	/* Wait for reconnect time in seconds */
{
	/*
	 * The please reconnect variable is used as a timer.
	 * It is decremented each time smt_event is called.
	 * This happens every second or when smt_force_irq is called.
	 * Note: smt_force_irq () is called on some packet receives and
	 *       when a multicast address is changed. Since nothing
	 *       is received during the disconnect and the multicast
	 *       address changes can be viewed as not very often and
	 *       the timer runs out close to its given value
	 *       (reconn_time).
	 */
	smc->sm.please_reconnect = reconn_time ;
}

#ifndef SMT_REAL_TOKEN_CT
void smt_emulate_token_ct(smc, mac_index)
struct s_smc	*smc;
int		mac_index;
{
	u_long	count;
	u_long	time;


	time = smt_get_time();
	count =	((time - smc->sm.last_tok_time[mac_index]) *
					100)/TICKS_PER_SECOND;

	/*
	 * Only when ring is up we will have a token count. The
	 * flag is unfortunatly a single instance value. This
	 * doesn't matter now, because we currently have only
	 * one MAC instance.
	 */
	if (smc->hw.mac_ring_is_up){
		smc->mib.m[mac_index].fddiMACToken_Ct += count;
	}

	/* Remember current time */
	smc->sm.last_tok_time[mac_index] = time;

}
#endif

/*ARGSUSED1*/
void smt_event(smc,event)
struct s_smc *smc ;
int event ;
{
	u_long		time ;
#ifndef SMT_REAL_TOKEN_CT
	int		i ;
#endif


	if (smc->sm.please_reconnect) {
		smc->sm.please_reconnect -- ;
		if (smc->sm.please_reconnect == 0) {
			/* Counted down */
			queue_event(smc,EVENT_ECM,EC_CONNECT) ;
		}
	}

	if (event == SM_FAST)
		return ;

	/*
	 * timer for periodic cleanup in driver
	 * reset and start the watchdog (FM2)
	 * ESS timer
	 * SBA timer
	 */
	smt_timer_poll(smc) ;
	smt_start_watchdog(smc) ;
#ifndef	SLIM_SMT
#ifndef BOOT
#ifdef	ESS
	ess_timer_poll(smc) ;
#endif
#endif
#ifdef	SBA
	sba_timer_poll(smc) ;
#endif

	smt_srf_event(smc,0,0,0) ;

#endif	/* no SLIM_SMT */

	time = smt_get_time() ;

	if (time - smc->sm.smt_last_lem >= TICKS_PER_SECOND*8) {
		/*
		 * Use 8 sec. for the time intervall, it simplifies the
		 * LER estimation.
		 */
		struct fddi_mib_m	*mib ;
		u_long			upper ;
		u_long			lower ;
		int			cond ;
		int			port;
		struct s_phy		*phy ;
		/*
		 * calculate LEM bit error rate
		 */
		sm_lem_evaluate(smc) ;
		smc->sm.smt_last_lem = time ;

		/*
		 * check conditions
		 */
#ifndef	SLIM_SMT
		mac_update_counter(smc) ;
		mib = smc->mib.m ;
		upper =
		(mib->fddiMACLost_Ct - mib->fddiMACOld_Lost_Ct) +
		(mib->fddiMACError_Ct - mib->fddiMACOld_Error_Ct) ;
		lower =
		(mib->fddiMACFrame_Ct - mib->fddiMACOld_Frame_Ct) +
		(mib->fddiMACLost_Ct - mib->fddiMACOld_Lost_Ct) ;
		mib->fddiMACFrameErrorRatio = div_ratio(upper,lower) ;

		cond =
			((!mib->fddiMACFrameErrorThreshold &&
			mib->fddiMACError_Ct != mib->fddiMACOld_Error_Ct) ||
			(mib->fddiMACFrameErrorRatio >
			mib->fddiMACFrameErrorThreshold)) ;

		if (cond != mib->fddiMACFrameErrorFlag)
			smt_srf_event(smc,SMT_COND_MAC_FRAME_ERROR,
				INDEX_MAC,cond) ;

		upper =
		(mib->fddiMACNotCopied_Ct - mib->fddiMACOld_NotCopied_Ct) ;
		lower =
		upper +
		(mib->fddiMACCopied_Ct - mib->fddiMACOld_Copied_Ct) ;
		mib->fddiMACNotCopiedRatio = div_ratio(upper,lower) ;

		cond =
			((!mib->fddiMACNotCopiedThreshold &&
			mib->fddiMACNotCopied_Ct !=
				mib->fddiMACOld_NotCopied_Ct)||
			(mib->fddiMACNotCopiedRatio >
			mib->fddiMACNotCopiedThreshold)) ;

		if (cond != mib->fddiMACNotCopiedFlag)
			smt_srf_event(smc,SMT_COND_MAC_NOT_COPIED,
				INDEX_MAC,cond) ;

		/*
		 * set old values
		 */
		mib->fddiMACOld_Frame_Ct = mib->fddiMACFrame_Ct ;
		mib->fddiMACOld_Copied_Ct = mib->fddiMACCopied_Ct ;
		mib->fddiMACOld_Error_Ct = mib->fddiMACError_Ct ;
		mib->fddiMACOld_Lost_Ct = mib->fddiMACLost_Ct ;
		mib->fddiMACOld_NotCopied_Ct = mib->fddiMACNotCopied_Ct ;

		/*
		 * Check port EBError Condition
		 */
		for (port = 0; port < NUMPHYS; port ++) {
			phy = &smc->y[port] ;

			if (!phy->mib->fddiPORTHardwarePresent) {
				continue;
			}

			cond = (phy->mib->fddiPORTEBError_Ct -
				phy->mib->fddiPORTOldEBError_Ct > 5) ;

			/* If ratio is more than 5 in 8 seconds
			 * Set the condition.
			 */
			smt_srf_event(smc,SMT_COND_PORT_EB_ERROR,
				(int) (INDEX_PORT+ phy->np) ,cond) ;

			/*
			 * set old values
			 */
			phy->mib->fddiPORTOldEBError_Ct =
				phy->mib->fddiPORTEBError_Ct ;
		}

#endif	/* no SLIM_SMT */
	}

#ifndef	SLIM_SMT

	if (time - smc->sm.smt_last_notify >= (u_long)
		(smc->mib.fddiSMTTT_Notify * TICKS_PER_SECOND) ) {
		/*
		 * we can either send an announcement or a request
		 * a request will trigger a reply so that we can update
		 * our dna
		 * note: same tid must be used until reply is received
		 */
		if (!smc->sm.pend[SMT_TID_NIF])
			smc->sm.pend[SMT_TID_NIF] = smt_get_tid(smc) ;
		smt_send_nif(smc,&fddi_broadcast,FC_SMT_NSA,
			smc->sm.pend[SMT_TID_NIF], SMT_REQUEST,0) ;
		smc->sm.smt_last_notify = time ;
	}

	/*
	 * check timer
	 */
	if (smc->sm.smt_tvu &&
	    time - smc->sm.smt_tvu > 228*TICKS_PER_SECOND) {
		DB_SMT("SMT : UNA expired\n",0,0) ;
		smc->sm.smt_tvu = 0 ;

		if (!is_equal(&smc->mib.m[MAC0].fddiMACUpstreamNbr,
			&SMT_Unknown)){
			/* Do not update unknown address */
			smc->mib.m[MAC0].fddiMACOldUpstreamNbr=
				smc->mib.m[MAC0].fddiMACUpstreamNbr ;
		}
		smc->mib.m[MAC0].fddiMACUpstreamNbr = SMT_Unknown ;
		smc->mib.m[MAC0].fddiMACUNDA_Flag = FALSE ;
		/*
		 * Make sure the fddiMACUNDA_Flag = FALSE is
		 * included in the SRF so we don't generate
		 * a seperate SRF for the deassertion of this
		 * condition
		 */
		update_dac(smc,0) ;
		smt_srf_event(smc, SMT_EVENT_MAC_NEIGHBOR_CHANGE,
			INDEX_MAC,0) ;
	}
	if (smc->sm.smt_tvd &&
	    time - smc->sm.smt_tvd > 228*TICKS_PER_SECOND) {
		DB_SMT("SMT : DNA expired\n",0,0) ;
		smc->sm.smt_tvd = 0 ;
		if (!is_equal(&smc->mib.m[MAC0].fddiMACDownstreamNbr,
			&SMT_Unknown)){
			/* Do not update unknown address */
			smc->mib.m[MAC0].fddiMACOldDownstreamNbr=
				smc->mib.m[MAC0].fddiMACDownstreamNbr ;
		}
		smc->mib.m[MAC0].fddiMACDownstreamNbr = SMT_Unknown ;
		smt_srf_event(smc, SMT_EVENT_MAC_NEIGHBOR_CHANGE,
			INDEX_MAC,0) ;
	}

#endif	/* no SLIM_SMT */

#ifndef SMT_REAL_TOKEN_CT
	/*
	 * Token counter emulation section. If hardware supports the token
	 * count, the token counter will be updated in mac_update_counter.
	 */
	for (i = MAC0; i < NUMMACS; i++ ){
		if (time - smc->sm.last_tok_time[i] > 2*TICKS_PER_SECOND ){
			smt_emulate_token_ct( smc, i );
		}
	}
#endif

	smt_timer_start(smc,&smc->sm.smt_timer, (u_long)1000000L,
		EV_TOKEN(EVENT_SMT,SM_TIMER)) ;
}

static int div_ratio(upper,lower)
u_long upper ;
u_long lower ;
{
	if ((upper<<16L) < upper)
		upper = 0xffff0000L ;
	else
		upper <<= 16L ;
	if (!lower)
		return(0) ;
	return((int)(upper/lower)) ;
}

#ifndef	SLIM_SMT

/*
 * receive packet handler
 */
void smt_received_pack(smc,mb,fs)
struct s_smc *smc ;
SMbuf *mb ;
int fs ;			/* frame status */
{
	struct smt_header	*sm ;
	int			local ;

	int			illegal = 0 ;

	switch (m_fc(mb)) {
	case FC_SMT_INFO :
	case FC_SMT_LAN_LOC :
	case FC_SMT_LOC :
	case FC_SMT_NSA :
		break ;
	default :
		smt_free_mbuf(smc,mb) ;
		return ;
	}

	smc->mib.m[MAC0].fddiMACSMTCopied_Ct++ ;
	sm = smtod(mb,struct smt_header *) ;
	local = ((fs & L_INDICATOR) != 0) ;
	hwm_conv_can(smc,(char *)sm,12) ;

	/* check destination address */
	if (is_individual(&sm->smt_dest) && !is_my_addr(smc,&sm->smt_dest)) {
		smt_free_mbuf(smc,mb) ;
		return ;
	}
#if	0		/* for DUP recognition, do NOT filter them */
	/* ignore loop back packets */
	if (is_my_addr(smc,&sm->smt_source) && !local) {
		smt_free_mbuf(smc,mb) ;
		return ;
	}
#endif

	smt_swap_para(sm,(int) mb->sm_len,1) ;
	DB_SMT("SMT : received packet [%s] at 0x%x\n",
		smt_type_name[m_fc(mb) & 0xf],sm) ;
	DB_SMT("SMT : version %d, class %s\n",sm->smt_version,
		smt_class_name[(sm->smt_class>LAST_CLASS)?0 : sm->smt_class]) ;

#ifdef	SBA
	/*
	 * check if NSA frame
	 */
	if (m_fc(mb) == FC_SMT_NSA && sm->smt_class == SMT_NIF &&
		(sm->smt_type == SMT_ANNOUNCE || sm->smt_type == SMT_REQUEST)) {
			smc->sba.sm = sm ;
			sba(smc,NIF) ;
	}
#endif

	/*
	 * ignore any packet with NSA and A-indicator set
	 */
	if ( (fs & A_INDICATOR) && m_fc(mb) == FC_SMT_NSA) {
		DB_SMT("SMT : ignoring NSA with A-indicator set from %s\n",
			addr_to_string(&sm->smt_source),0) ;
		smt_free_mbuf(smc,mb) ;
		return ;
	}

	/*
	 * ignore frames with illegal length
	 */
	if (((sm->smt_class == SMT_ECF) && (sm->smt_len > SMT_MAX_ECHO_LEN)) ||
	    ((sm->smt_class != SMT_ECF) && (sm->smt_len > SMT_MAX_INFO_LEN))) {
		smt_free_mbuf(smc,mb) ;
		return ;
	}

	/*
	 * check SMT version
	 */
	switch (sm->smt_class) {
	case SMT_NIF :