ess.c

h内核

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

/*
 * *******************************************************************
 * This SBA code implements the Synchronous Bandwidth Allocation
 * functions described in the "FDDI Synchronous Forum Implementer's
 * Agreement" dated December 1th, 1993.
 * *******************************************************************
 *
 *	PURPOSE: The purpose of this function is to control
 *		 synchronous allocations on a single FDDI segment.
 *		 Allocations are limited to the primary FDDI ring.
 *		 The SBM provides recovery mechanisms to recover
 *		 unused bandwidth also resolves T_Neg and
 *		 reconfiguration changes. Many of the SBM state
 *		 machine inputs are sourced by the underlying
 *		 FDDI sub-system supporting the SBA application.
 *
 * *******************************************************************
 */

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


#ifndef	SLIM_SMT

#ifdef ESS

#ifndef lint
static const char ID_sccs[] = "@(#)ess.c	1.10 96/02/23 (C) SK" ;
#define LINT_USE(x)
#else
#define LINT_USE(x)	(x)=(x)
#endif
#define MS2BCLK(x)	((x)*12500L)

/*
	-------------------------------------------------------------
	LOCAL VARIABLES:
	-------------------------------------------------------------
*/

static const u_short plist_raf_alc_res[] = { SMT_P0012, SMT_P320B, SMT_P320F,
					SMT_P3210, SMT_P0019, SMT_P001A,
					SMT_P001D, 0 } ;

static const u_short plist_raf_chg_req[] = { SMT_P320B, SMT_P320F, SMT_P3210,
					SMT_P001A, 0 } ;

static const struct fddi_addr smt_sba_da = {{0x80,0x01,0x43,0x00,0x80,0x0C}} ;
static const struct fddi_addr null_addr = {{0,0,0,0,0,0}} ;

/*
	-------------------------------------------------------------
	GLOBAL VARIABLES:
	-------------------------------------------------------------
*/


/*
	-------------------------------------------------------------
	LOCAL FUNCTIONS:
	-------------------------------------------------------------
*/

static void ess_send_response(struct s_smc *smc, struct smt_header *sm,
			      int sba_cmd);
static void ess_config_fifo(struct s_smc *smc);
static void ess_send_alc_req(struct s_smc *smc);
static void ess_send_frame(struct s_smc *smc, SMbuf *mb);

/*
	-------------------------------------------------------------
	EXTERNAL FUNCTIONS:
	-------------------------------------------------------------
*/

/*
	-------------------------------------------------------------
	PUBLIC FUNCTIONS:
	-------------------------------------------------------------
*/

void ess_timer_poll(struct s_smc *smc);
void ess_para_change(struct s_smc *smc);
int ess_raf_received_pack(struct s_smc *smc, SMbuf *mb, struct smt_header *sm,
			  int fs);
int process_bw_alloc(struct s_smc *smc, long int payload, long int overhead);


/*
 * --------------------------------------------------------------------------
 *	End Station Support	(ESS)
 * --------------------------------------------------------------------------
 */

/*
 * evaluate the RAF frame
 */
int ess_raf_received_pack(struct s_smc *smc, SMbuf *mb, struct smt_header *sm,
			  int fs)
{
	void			*p ;		/* universal pointer */
	struct smt_p_0016	*cmd ;		/* para: command for the ESS */
	SMbuf			*db ;
	u_long			msg_res_type ;	/* recource type */
	u_long			payload, overhead ;
	int			local ;
	int			i ;

	/*
	 * Message Processing Code
	 */
	 local = ((fs & L_INDICATOR) != 0) ;

	/*
	 * get the resource type
	 */
	if (!(p = (void *) sm_to_para(smc,sm,SMT_P0015))) {
		DB_ESS("ESS: RAF frame error, parameter type not found\n",0,0) ;
		return(fs) ;
	}
	msg_res_type = ((struct smt_p_0015 *)p)->res_type ;

	/*
	 * get the pointer to the ESS command
	 */
	if (!(cmd = (struct smt_p_0016 *) sm_to_para(smc,sm,SMT_P0016))) {
		/*
		 * error in frame: para ESS command was not found
		 */
		 DB_ESS("ESS: RAF frame error, parameter command not found\n",0,0);
		 return(fs) ;
	}

	DB_ESSN(2,"fc %x	ft %x\n",sm->smt_class,sm->smt_type) ;
	DB_ESSN(2,"ver %x	tran %lx\n",sm->smt_version,sm->smt_tid) ;
	DB_ESSN(2,"stn_id %s\n",addr_to_string(&sm->smt_source),0) ;

	DB_ESSN(2,"infolen %x	res %x\n",sm->smt_len, msg_res_type) ;
	DB_ESSN(2,"sbacmd %x\n",cmd->sba_cmd,0) ;

	/*
	 * evaluate the ESS command
	 */
	switch (cmd->sba_cmd) {

	/*
	 * Process an ESS Allocation Request
	 */
	case REQUEST_ALLOCATION :
		/*
		 * check for an RAF Request (Allocation Request)
		 */
		if (sm->smt_type == SMT_REQUEST) {
			/*
			 * process the Allocation request only if the frame is
			 * local and no static allocation is used
			 */
			if (!local || smc->mib.fddiESSPayload)
				return(fs) ;
			
			p = (void *) sm_to_para(smc,sm,SMT_P0019)  ;
			for (i = 0; i < 5; i++) {
				if (((struct smt_p_0019 *)p)->alloc_addr.a[i]) {
					return(fs) ;
				}
			}

			/*
			 * Note: The Application should send a LAN_LOC_FRAME.
			 *	 The ESS do not send the Frame to the network!
			 */
			smc->ess.alloc_trans_id = sm->smt_tid ;
			DB_ESS("ESS: save Alloc Req Trans ID %lx\n",sm->smt_tid,0);
			p = (void *) sm_to_para(smc,sm,SMT_P320F) ;
			((struct smt_p_320f *)p)->mib_payload =
				smc->mib.a[PATH0].fddiPATHSbaPayload ;
			p = (void *) sm_to_para(smc,sm,SMT_P3210) ;
			((struct smt_p_3210 *)p)->mib_overhead =
				smc->mib.a[PATH0].fddiPATHSbaOverhead ;
			sm->smt_dest = smt_sba_da ;

			if (smc->ess.local_sba_active)
				return(fs | I_INDICATOR) ;

			if (!(db = smt_get_mbuf(smc)))
				return(fs) ;

			db->sm_len = mb->sm_len ;
			db->sm_off = mb->sm_off ;
			memcpy(((char *)(db->sm_data+db->sm_off)),(char *)sm,
				(int)db->sm_len) ;
			dump_smt(smc,
				(struct smt_header *)(db->sm_data+db->sm_off),
				"RAF") ;
			smt_send_frame(smc,db,FC_SMT_INFO,0) ;
			return(fs) ;
		}

		/*
		 * The RAF frame is an Allocation Response !
		 * check the parameters
		 */
		if (smt_check_para(smc,sm,plist_raf_alc_res)) {
			DB_ESS("ESS: RAF with para problem, ignoring\n",0,0) ;
			return(fs) ;
		}

		/*
		 * VERIFY THE FRAME IS WELL BUILT:
		 *
		 *	1. path index = primary ring only
		 *	2. resource type = sync bw only
		 *	3. trans action id = alloc_trans_id
		 *	4. reason code = success
		 *
		 * If any are violated, discard the RAF frame
		 */
		if ((((struct smt_p_320b *)sm_to_para(smc,sm,SMT_P320B))->path_index
			!= PRIMARY_RING) ||
			(msg_res_type != SYNC_BW) ||
		(((struct smt_p_reason *)sm_to_para(smc,sm,SMT_P0012))->rdf_reason
			!= SMT_RDF_SUCCESS) ||
			(sm->smt_tid != smc->ess.alloc_trans_id)) {

			DB_ESS("ESS: Allocation Responce not accepted\n",0,0) ;
			return(fs) ;
		}

		/*
		 * Extract message parameters
		 */
		p = (void *) sm_to_para(smc,sm,SMT_P320F) ;
                if (!p) {
                        printk(KERN_ERR "ESS: sm_to_para failed");
                        return fs;
                }       
		payload = ((struct smt_p_320f *)p)->mib_payload ;
		p = (void *) sm_to_para(smc,sm,SMT_P3210) ;
                if (!p) {
                        printk(KERN_ERR "ESS: sm_to_para failed");
                        return fs;
                }       
		overhead = ((struct smt_p_3210 *)p)->mib_overhead ;

		DB_ESSN(2,"payload= %lx	overhead= %lx\n",payload,overhead) ;

		/*
		 * process the bandwidth allocation
		 */
		(void)process_bw_alloc(smc,(long)payload,(long)overhead) ;

		return(fs) ;
		/* end of Process Allocation Request */

	/*
	 * Process an ESS Change Request
	 */
	case CHANGE_ALLOCATION :
		/*
		 * except only replies
		 */
		if (sm->smt_type != SMT_REQUEST) {
			DB_ESS("ESS: Do not process Change Responses\n",0,0) ;
			return(fs) ;
		}

		/*
		 * check the para for the Change Request
		 */
		if (smt_check_para(smc,sm,plist_raf_chg_req)) {
			DB_ESS("ESS: RAF with para problem, ignoring\n",0,0) ;
			return(fs) ;
		}

		/*
		 * Verify the path index and resource
		 * type are correct. If any of
		 * these are false, don't process this
		 * change request frame.
		 */
		if ((((struct smt_p_320b *)sm_to_para(smc,sm,SMT_P320B))->path_index
			!= PRIMARY_RING) || (msg_res_type != SYNC_BW)) {
			DB_ESS("ESS: RAF frame with para problem, ignoring\n",0,0) ;
			return(fs) ;
		}

		/*
		 * Extract message queue parameters
		 */
		p = (void *) sm_to_para(smc,sm,SMT_P320F) ;
		payload = ((struct smt_p_320f *)p)->mib_payload ;
		p = (void *) sm_to_para(smc,sm,SMT_P3210) ;
		overhead = ((struct smt_p_3210 *)p)->mib_overhead ;

		DB_ESSN(2,"ESS: Change Request from %s\n",
			addr_to_string(&sm->smt_source),0) ;
		DB_ESSN(2,"payload= %lx	overhead= %lx\n",payload,overhead) ;

		/*
		 * process the bandwidth allocation
		 */
		if(!process_bw_alloc(smc,(long)payload,(long)overhead))
			return(fs) ;

		/*
		 * send an RAF Change Reply
		 */
		ess_send_response(smc,sm,CHANGE_ALLOCATION) ;

		return(fs) ;
		/* end of Process Change Request */

	/*
	 * Process Report Response
	 */
	case REPORT_ALLOCATION :
		/*
		 * except only requests
		 */
		if (sm->smt_type != SMT_REQUEST) {
			DB_ESS("ESS: Do not process a Report Reply\n",0,0) ;
			return(fs) ;
		}

		DB_ESSN(2,"ESS: Report Request from %s\n",
			addr_to_string(&(sm->smt_source)),0) ;

		/*
		 * verify that the resource type is sync bw only
		 */
		if (msg_res_type != SYNC_BW) {
			DB_ESS("ESS: ignoring RAF with para problem\n",0,0) ;
			return(fs) ;
		}

		/*
		 * send an RAF Change Reply
		 */
		ess_send_response(smc,sm,REPORT_ALLOCATION) ;

		return(fs) ;
		/* end of Process Report Request */