718 lines
18 KiB
C
718 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/******************************************************************************
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*
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* (C)Copyright 1998,1999 SysKonnect,
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* a business unit of Schneider & Koch & Co. Datensysteme GmbH.
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*
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* See the file "skfddi.c" for further information.
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*
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* The information in this file is provided "AS IS" without warranty.
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*
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******************************************************************************/
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/*
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* *******************************************************************
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* This SBA code implements the Synchronous Bandwidth Allocation
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* functions described in the "FDDI Synchronous Forum Implementer's
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* Agreement" dated December 1th, 1993.
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* *******************************************************************
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*
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* PURPOSE: The purpose of this function is to control
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* synchronous allocations on a single FDDI segment.
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* Allocations are limited to the primary FDDI ring.
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* The SBM provides recovery mechanisms to recover
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* unused bandwidth also resolves T_Neg and
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* reconfiguration changes. Many of the SBM state
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* machine inputs are sourced by the underlying
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* FDDI sub-system supporting the SBA application.
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*
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* *******************************************************************
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*/
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#include "h/types.h"
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#include "h/fddi.h"
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#include "h/smc.h"
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#include "h/smt_p.h"
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#ifndef SLIM_SMT
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#ifdef ESS
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#ifndef lint
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#define LINT_USE(x)
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#else
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#define LINT_USE(x) (x)=(x)
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#endif
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#define MS2BCLK(x) ((x)*12500L)
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/*
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-------------------------------------------------------------
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LOCAL VARIABLES:
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-------------------------------------------------------------
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*/
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static const u_short plist_raf_alc_res[] = { SMT_P0012, SMT_P320B, SMT_P320F,
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SMT_P3210, SMT_P0019, SMT_P001A,
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SMT_P001D, 0 } ;
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static const u_short plist_raf_chg_req[] = { SMT_P320B, SMT_P320F, SMT_P3210,
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SMT_P001A, 0 } ;
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static const struct fddi_addr smt_sba_da = {{0x80,0x01,0x43,0x00,0x80,0x0C}} ;
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static const struct fddi_addr null_addr = {{0,0,0,0,0,0}} ;
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/*
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-------------------------------------------------------------
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GLOBAL VARIABLES:
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-------------------------------------------------------------
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*/
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/*
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-------------------------------------------------------------
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LOCAL FUNCTIONS:
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-------------------------------------------------------------
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*/
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static void ess_send_response(struct s_smc *smc, struct smt_header *sm,
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int sba_cmd);
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static void ess_config_fifo(struct s_smc *smc);
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static void ess_send_alc_req(struct s_smc *smc);
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static void ess_send_frame(struct s_smc *smc, SMbuf *mb);
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/*
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-------------------------------------------------------------
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EXTERNAL FUNCTIONS:
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-------------------------------------------------------------
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*/
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/*
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-------------------------------------------------------------
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PUBLIC FUNCTIONS:
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-------------------------------------------------------------
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*/
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void ess_timer_poll(struct s_smc *smc);
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void ess_para_change(struct s_smc *smc);
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int ess_raf_received_pack(struct s_smc *smc, SMbuf *mb, struct smt_header *sm,
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int fs);
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static int process_bw_alloc(struct s_smc *smc, long int payload, long int overhead);
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/*
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* --------------------------------------------------------------------------
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* End Station Support (ESS)
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* --------------------------------------------------------------------------
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*/
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/*
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* evaluate the RAF frame
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*/
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int ess_raf_received_pack(struct s_smc *smc, SMbuf *mb, struct smt_header *sm,
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int fs)
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{
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void *p ; /* universal pointer */
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struct smt_p_0016 *cmd ; /* para: command for the ESS */
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SMbuf *db ;
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u_long msg_res_type ; /* recource type */
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u_long payload, overhead ;
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int local ;
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int i ;
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/*
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* Message Processing Code
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*/
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local = ((fs & L_INDICATOR) != 0) ;
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/*
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* get the resource type
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*/
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if (!(p = (void *) sm_to_para(smc,sm,SMT_P0015))) {
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DB_ESS("ESS: RAF frame error, parameter type not found");
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return fs;
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}
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msg_res_type = ((struct smt_p_0015 *)p)->res_type ;
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/*
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* get the pointer to the ESS command
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*/
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if (!(cmd = (struct smt_p_0016 *) sm_to_para(smc,sm,SMT_P0016))) {
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/*
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* error in frame: para ESS command was not found
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*/
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DB_ESS("ESS: RAF frame error, parameter command not found");
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return fs;
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}
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DB_ESSN(2, "fc %x ft %x", sm->smt_class, sm->smt_type);
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DB_ESSN(2, "ver %x tran %x", sm->smt_version, sm->smt_tid);
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DB_ESSN(2, "stn_id %pM", &sm->smt_source);
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DB_ESSN(2, "infolen %x res %lx", sm->smt_len, msg_res_type);
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DB_ESSN(2, "sbacmd %x", cmd->sba_cmd);
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/*
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* evaluate the ESS command
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*/
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switch (cmd->sba_cmd) {
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/*
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* Process an ESS Allocation Request
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*/
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case REQUEST_ALLOCATION :
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/*
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* check for an RAF Request (Allocation Request)
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*/
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if (sm->smt_type == SMT_REQUEST) {
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/*
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* process the Allocation request only if the frame is
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* local and no static allocation is used
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*/
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if (!local || smc->mib.fddiESSPayload)
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return fs;
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p = (void *) sm_to_para(smc,sm,SMT_P0019) ;
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for (i = 0; i < 5; i++) {
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if (((struct smt_p_0019 *)p)->alloc_addr.a[i]) {
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return fs;
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}
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}
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/*
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* Note: The Application should send a LAN_LOC_FRAME.
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* The ESS do not send the Frame to the network!
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*/
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smc->ess.alloc_trans_id = sm->smt_tid ;
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DB_ESS("ESS: save Alloc Req Trans ID %x", sm->smt_tid);
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p = (void *) sm_to_para(smc,sm,SMT_P320F) ;
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((struct smt_p_320f *)p)->mib_payload =
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smc->mib.a[PATH0].fddiPATHSbaPayload ;
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p = (void *) sm_to_para(smc,sm,SMT_P3210) ;
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((struct smt_p_3210 *)p)->mib_overhead =
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smc->mib.a[PATH0].fddiPATHSbaOverhead ;
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sm->smt_dest = smt_sba_da ;
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if (smc->ess.local_sba_active)
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return fs | I_INDICATOR;
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if (!(db = smt_get_mbuf(smc)))
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return fs;
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db->sm_len = mb->sm_len ;
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db->sm_off = mb->sm_off ;
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memcpy(((char *)(db->sm_data+db->sm_off)),(char *)sm,
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(int)db->sm_len) ;
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dump_smt(smc,
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(struct smt_header *)(db->sm_data+db->sm_off),
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"RAF") ;
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smt_send_frame(smc,db,FC_SMT_INFO,0) ;
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return fs;
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}
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/*
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* The RAF frame is an Allocation Response !
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* check the parameters
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*/
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if (smt_check_para(smc,sm,plist_raf_alc_res)) {
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DB_ESS("ESS: RAF with para problem, ignoring");
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return fs;
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}
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/*
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* VERIFY THE FRAME IS WELL BUILT:
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*
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* 1. path index = primary ring only
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* 2. resource type = sync bw only
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* 3. trans action id = alloc_trans_id
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* 4. reason code = success
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*
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* If any are violated, discard the RAF frame
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*/
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if ((((struct smt_p_320b *)sm_to_para(smc,sm,SMT_P320B))->path_index
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!= PRIMARY_RING) ||
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(msg_res_type != SYNC_BW) ||
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(((struct smt_p_reason *)sm_to_para(smc,sm,SMT_P0012))->rdf_reason
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!= SMT_RDF_SUCCESS) ||
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(sm->smt_tid != smc->ess.alloc_trans_id)) {
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DB_ESS("ESS: Allocation Response not accepted");
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return fs;
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}
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/*
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* Extract message parameters
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*/
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p = (void *) sm_to_para(smc,sm,SMT_P320F) ;
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if (!p) {
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printk(KERN_ERR "ESS: sm_to_para failed");
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return fs;
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}
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payload = ((struct smt_p_320f *)p)->mib_payload ;
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p = (void *) sm_to_para(smc,sm,SMT_P3210) ;
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if (!p) {
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printk(KERN_ERR "ESS: sm_to_para failed");
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return fs;
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}
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overhead = ((struct smt_p_3210 *)p)->mib_overhead ;
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DB_ESSN(2, "payload= %lx overhead= %lx",
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payload, overhead);
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/*
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* process the bandwidth allocation
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*/
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(void)process_bw_alloc(smc,(long)payload,(long)overhead) ;
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return fs;
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/* end of Process Allocation Request */
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/*
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* Process an ESS Change Request
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*/
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case CHANGE_ALLOCATION :
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/*
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* except only replies
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*/
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if (sm->smt_type != SMT_REQUEST) {
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DB_ESS("ESS: Do not process Change Responses");
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return fs;
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}
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/*
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* check the para for the Change Request
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*/
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if (smt_check_para(smc,sm,plist_raf_chg_req)) {
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DB_ESS("ESS: RAF with para problem, ignoring");
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return fs;
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}
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/*
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* Verify the path index and resource
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* type are correct. If any of
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* these are false, don't process this
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* change request frame.
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*/
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if ((((struct smt_p_320b *)sm_to_para(smc,sm,SMT_P320B))->path_index
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!= PRIMARY_RING) || (msg_res_type != SYNC_BW)) {
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DB_ESS("ESS: RAF frame with para problem, ignoring");
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return fs;
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}
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/*
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* Extract message queue parameters
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*/
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p = (void *) sm_to_para(smc,sm,SMT_P320F) ;
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payload = ((struct smt_p_320f *)p)->mib_payload ;
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p = (void *) sm_to_para(smc,sm,SMT_P3210) ;
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overhead = ((struct smt_p_3210 *)p)->mib_overhead ;
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DB_ESSN(2, "ESS: Change Request from %pM",
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&sm->smt_source);
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DB_ESSN(2, "payload= %lx overhead= %lx",
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payload, overhead);
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/*
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* process the bandwidth allocation
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*/
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if(!process_bw_alloc(smc,(long)payload,(long)overhead))
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return fs;
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/*
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* send an RAF Change Reply
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*/
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ess_send_response(smc,sm,CHANGE_ALLOCATION) ;
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return fs;
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/* end of Process Change Request */
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/*
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* Process Report Response
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*/
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case REPORT_ALLOCATION :
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/*
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* except only requests
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*/
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if (sm->smt_type != SMT_REQUEST) {
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DB_ESS("ESS: Do not process a Report Reply");
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return fs;
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}
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DB_ESSN(2, "ESS: Report Request from %pM",
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&sm->smt_source);
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/*
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* verify that the resource type is sync bw only
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*/
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if (msg_res_type != SYNC_BW) {
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DB_ESS("ESS: ignoring RAF with para problem");
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return fs;
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}
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/*
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* send an RAF Change Reply
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*/
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ess_send_response(smc,sm,REPORT_ALLOCATION) ;
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return fs;
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/* end of Process Report Request */
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default:
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/*
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* error in frame
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*/
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DB_ESS("ESS: ignoring RAF with bad sba_cmd");
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break ;
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}
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return fs;
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}
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/*
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* determines the synchronous bandwidth, set the TSYNC register and the
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* mib variables SBAPayload, SBAOverhead and fddiMACT-NEG.
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*/
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static int process_bw_alloc(struct s_smc *smc, long int payload, long int overhead)
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{
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/*
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* determine the synchronous bandwidth (sync_bw) in bytes per T-NEG,
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* if the payload is greater than zero.
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* For the SBAPayload and the SBAOverhead we have the following
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* unite quations
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* _ _
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* | bytes |
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* SBAPayload = | 8000 ------ |
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* | s |
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* - -
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* _ _
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* | bytes |
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* SBAOverhead = | ------ |
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* | T-NEG |
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* - -
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*
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* T-NEG is described by the equation:
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*
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* (-) fddiMACT-NEG
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* T-NEG = -------------------
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* 12500000 1/s
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*
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* The number of bytes we are able to send is the payload
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* plus the overhead.
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*
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* bytes T-NEG SBAPayload 8000 bytes/s
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* sync_bw = SBAOverhead ------ + -----------------------------
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* T-NEG T-NEG
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*
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*
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* 1
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* sync_bw = SBAOverhead + ---- (-)fddiMACT-NEG * SBAPayload
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* 1562
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*
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*/
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/*
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* set the mib attributes fddiPATHSbaOverhead, fddiPATHSbaPayload
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*/
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/* if (smt_set_obj(smc,SMT_P320F,payload,S_SET)) {
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DB_ESS("ESS: SMT does not accept the payload value");
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return FALSE;
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}
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if (smt_set_obj(smc,SMT_P3210,overhead,S_SET)) {
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DB_ESS("ESS: SMT does not accept the overhead value");
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return FALSE;
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} */
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/* premliminary */
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if (payload > MAX_PAYLOAD || overhead > 5000) {
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DB_ESS("ESS: payload / overhead not accepted");
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return FALSE;
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}
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/*
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* start the iterative allocation process if the payload or the overhead
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* are smaller than the parsed values
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*/
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if (smc->mib.fddiESSPayload &&
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((u_long)payload != smc->mib.fddiESSPayload ||
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(u_long)overhead != smc->mib.fddiESSOverhead)) {
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smc->ess.raf_act_timer_poll = TRUE ;
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smc->ess.timer_count = 0 ;
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}
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/*
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* evulate the Payload
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*/
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if (payload) {
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DB_ESSN(2, "ESS: turn SMT_ST_SYNC_SERVICE bit on");
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smc->ess.sync_bw_available = TRUE ;
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smc->ess.sync_bw = overhead -
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(long)smc->mib.m[MAC0].fddiMACT_Neg *
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payload / 1562 ;
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}
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else {
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DB_ESSN(2, "ESS: turn SMT_ST_SYNC_SERVICE bit off");
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smc->ess.sync_bw_available = FALSE ;
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smc->ess.sync_bw = 0 ;
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overhead = 0 ;
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}
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smc->mib.a[PATH0].fddiPATHSbaPayload = payload ;
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smc->mib.a[PATH0].fddiPATHSbaOverhead = overhead ;
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DB_ESSN(2, "tsync = %lx", smc->ess.sync_bw);
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ess_config_fifo(smc) ;
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set_formac_tsync(smc,smc->ess.sync_bw) ;
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return TRUE;
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}
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static void ess_send_response(struct s_smc *smc, struct smt_header *sm,
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int sba_cmd)
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{
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struct smt_sba_chg *chg ;
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SMbuf *mb ;
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void *p ;
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/*
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* get and initialize the response frame
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*/
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if (sba_cmd == CHANGE_ALLOCATION) {
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if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REPLY,
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sizeof(struct smt_sba_chg))))
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return ;
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}
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else {
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if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REPLY,
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sizeof(struct smt_sba_rep_res))))
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return ;
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}
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chg = smtod(mb,struct smt_sba_chg *) ;
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chg->smt.smt_tid = sm->smt_tid ;
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chg->smt.smt_dest = sm->smt_source ;
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/* set P15 */
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chg->s_type.para.p_type = SMT_P0015 ;
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chg->s_type.para.p_len = sizeof(struct smt_p_0015) - PARA_LEN ;
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chg->s_type.res_type = SYNC_BW ;
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/* set P16 */
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chg->cmd.para.p_type = SMT_P0016 ;
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chg->cmd.para.p_len = sizeof(struct smt_p_0016) - PARA_LEN ;
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chg->cmd.sba_cmd = sba_cmd ;
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/* set P320B */
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chg->path.para.p_type = SMT_P320B ;
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chg->path.para.p_len = sizeof(struct smt_p_320b) - PARA_LEN ;
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chg->path.mib_index = SBAPATHINDEX ;
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chg->path.path_pad = 0;
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chg->path.path_index = PRIMARY_RING ;
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/* set P320F */
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chg->payload.para.p_type = SMT_P320F ;
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chg->payload.para.p_len = sizeof(struct smt_p_320f) - PARA_LEN ;
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chg->payload.mib_index = SBAPATHINDEX ;
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chg->payload.mib_payload = smc->mib.a[PATH0].fddiPATHSbaPayload ;
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/* set P3210 */
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chg->overhead.para.p_type = SMT_P3210 ;
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chg->overhead.para.p_len = sizeof(struct smt_p_3210) - PARA_LEN ;
|
|
chg->overhead.mib_index = SBAPATHINDEX ;
|
|
chg->overhead.mib_overhead = smc->mib.a[PATH0].fddiPATHSbaOverhead ;
|
|
|
|
if (sba_cmd == CHANGE_ALLOCATION) {
|
|
/* set P1A */
|
|
chg->cat.para.p_type = SMT_P001A ;
|
|
chg->cat.para.p_len = sizeof(struct smt_p_001a) - PARA_LEN ;
|
|
p = (void *) sm_to_para(smc,sm,SMT_P001A) ;
|
|
chg->cat.category = ((struct smt_p_001a *)p)->category ;
|
|
}
|
|
dump_smt(smc,(struct smt_header *)chg,"RAF") ;
|
|
ess_send_frame(smc,mb) ;
|
|
}
|
|
|
|
void ess_timer_poll(struct s_smc *smc)
|
|
{
|
|
if (!smc->ess.raf_act_timer_poll)
|
|
return ;
|
|
|
|
DB_ESSN(2, "ESS: timer_poll");
|
|
|
|
smc->ess.timer_count++ ;
|
|
if (smc->ess.timer_count == 10) {
|
|
smc->ess.timer_count = 0 ;
|
|
ess_send_alc_req(smc) ;
|
|
}
|
|
}
|
|
|
|
static void ess_send_alc_req(struct s_smc *smc)
|
|
{
|
|
struct smt_sba_alc_req *req ;
|
|
SMbuf *mb ;
|
|
|
|
/*
|
|
* send never allocation request where the requested payload and
|
|
* overhead is zero or deallocate bandwidth when no bandwidth is
|
|
* parsed
|
|
*/
|
|
if (!smc->mib.fddiESSPayload) {
|
|
smc->mib.fddiESSOverhead = 0 ;
|
|
}
|
|
else {
|
|
if (!smc->mib.fddiESSOverhead)
|
|
smc->mib.fddiESSOverhead = DEFAULT_OV ;
|
|
}
|
|
|
|
if (smc->mib.fddiESSOverhead ==
|
|
smc->mib.a[PATH0].fddiPATHSbaOverhead &&
|
|
smc->mib.fddiESSPayload ==
|
|
smc->mib.a[PATH0].fddiPATHSbaPayload){
|
|
smc->ess.raf_act_timer_poll = FALSE ;
|
|
smc->ess.timer_count = 7 ; /* next RAF alc req after 3 s */
|
|
return ;
|
|
}
|
|
|
|
/*
|
|
* get and initialize the response frame
|
|
*/
|
|
if (!(mb=smt_build_frame(smc,SMT_RAF,SMT_REQUEST,
|
|
sizeof(struct smt_sba_alc_req))))
|
|
return ;
|
|
req = smtod(mb,struct smt_sba_alc_req *) ;
|
|
req->smt.smt_tid = smc->ess.alloc_trans_id = smt_get_tid(smc) ;
|
|
req->smt.smt_dest = smt_sba_da ;
|
|
|
|
/* set P15 */
|
|
req->s_type.para.p_type = SMT_P0015 ;
|
|
req->s_type.para.p_len = sizeof(struct smt_p_0015) - PARA_LEN ;
|
|
req->s_type.res_type = SYNC_BW ;
|
|
|
|
/* set P16 */
|
|
req->cmd.para.p_type = SMT_P0016 ;
|
|
req->cmd.para.p_len = sizeof(struct smt_p_0016) - PARA_LEN ;
|
|
req->cmd.sba_cmd = REQUEST_ALLOCATION ;
|
|
|
|
/*
|
|
* set the parameter type and parameter length of all used
|
|
* parameters
|
|
*/
|
|
|
|
/* set P320B */
|
|
req->path.para.p_type = SMT_P320B ;
|
|
req->path.para.p_len = sizeof(struct smt_p_320b) - PARA_LEN ;
|
|
req->path.mib_index = SBAPATHINDEX ;
|
|
req->path.path_pad = 0;
|
|
req->path.path_index = PRIMARY_RING ;
|
|
|
|
/* set P0017 */
|
|
req->pl_req.para.p_type = SMT_P0017 ;
|
|
req->pl_req.para.p_len = sizeof(struct smt_p_0017) - PARA_LEN ;
|
|
req->pl_req.sba_pl_req = smc->mib.fddiESSPayload -
|
|
smc->mib.a[PATH0].fddiPATHSbaPayload ;
|
|
|
|
/* set P0018 */
|
|
req->ov_req.para.p_type = SMT_P0018 ;
|
|
req->ov_req.para.p_len = sizeof(struct smt_p_0018) - PARA_LEN ;
|
|
req->ov_req.sba_ov_req = smc->mib.fddiESSOverhead -
|
|
smc->mib.a[PATH0].fddiPATHSbaOverhead ;
|
|
|
|
/* set P320F */
|
|
req->payload.para.p_type = SMT_P320F ;
|
|
req->payload.para.p_len = sizeof(struct smt_p_320f) - PARA_LEN ;
|
|
req->payload.mib_index = SBAPATHINDEX ;
|
|
req->payload.mib_payload = smc->mib.a[PATH0].fddiPATHSbaPayload ;
|
|
|
|
/* set P3210 */
|
|
req->overhead.para.p_type = SMT_P3210 ;
|
|
req->overhead.para.p_len = sizeof(struct smt_p_3210) - PARA_LEN ;
|
|
req->overhead.mib_index = SBAPATHINDEX ;
|
|
req->overhead.mib_overhead = smc->mib.a[PATH0].fddiPATHSbaOverhead ;
|
|
|
|
/* set P19 */
|
|
req->a_addr.para.p_type = SMT_P0019 ;
|
|
req->a_addr.para.p_len = sizeof(struct smt_p_0019) - PARA_LEN ;
|
|
req->a_addr.sba_pad = 0;
|
|
req->a_addr.alloc_addr = null_addr ;
|
|
|
|
/* set P1A */
|
|
req->cat.para.p_type = SMT_P001A ;
|
|
req->cat.para.p_len = sizeof(struct smt_p_001a) - PARA_LEN ;
|
|
req->cat.category = smc->mib.fddiESSCategory ;
|
|
|
|
/* set P1B */
|
|
req->tneg.para.p_type = SMT_P001B ;
|
|
req->tneg.para.p_len = sizeof(struct smt_p_001b) - PARA_LEN ;
|
|
req->tneg.max_t_neg = smc->mib.fddiESSMaxTNeg ;
|
|
|
|
/* set P1C */
|
|
req->segm.para.p_type = SMT_P001C ;
|
|
req->segm.para.p_len = sizeof(struct smt_p_001c) - PARA_LEN ;
|
|
req->segm.min_seg_siz = smc->mib.fddiESSMinSegmentSize ;
|
|
|
|
dump_smt(smc,(struct smt_header *)req,"RAF") ;
|
|
ess_send_frame(smc,mb) ;
|
|
}
|
|
|
|
static void ess_send_frame(struct s_smc *smc, SMbuf *mb)
|
|
{
|
|
/*
|
|
* check if the frame must be send to the own ESS
|
|
*/
|
|
if (smc->ess.local_sba_active) {
|
|
/*
|
|
* Send the Change Reply to the local SBA
|
|
*/
|
|
DB_ESS("ESS:Send to the local SBA");
|
|
if (!smc->ess.sba_reply_pend)
|
|
smc->ess.sba_reply_pend = mb ;
|
|
else {
|
|
DB_ESS("Frame is lost - another frame was pending");
|
|
smt_free_mbuf(smc,mb) ;
|
|
}
|
|
}
|
|
else {
|
|
/*
|
|
* Send the SBA RAF Change Reply to the network
|
|
*/
|
|
DB_ESS("ESS:Send to the network");
|
|
smt_send_frame(smc,mb,FC_SMT_INFO,0) ;
|
|
}
|
|
}
|
|
|
|
void ess_para_change(struct s_smc *smc)
|
|
{
|
|
(void)process_bw_alloc(smc,(long)smc->mib.a[PATH0].fddiPATHSbaPayload,
|
|
(long)smc->mib.a[PATH0].fddiPATHSbaOverhead) ;
|
|
}
|
|
|
|
static void ess_config_fifo(struct s_smc *smc)
|
|
{
|
|
/*
|
|
* if nothing to do exit
|
|
*/
|
|
if (smc->mib.a[PATH0].fddiPATHSbaPayload) {
|
|
if (smc->hw.fp.fifo.fifo_config_mode & SYNC_TRAFFIC_ON &&
|
|
(smc->hw.fp.fifo.fifo_config_mode&SEND_ASYNC_AS_SYNC) ==
|
|
smc->mib.fddiESSSynchTxMode) {
|
|
return ;
|
|
}
|
|
}
|
|
else {
|
|
if (!(smc->hw.fp.fifo.fifo_config_mode & SYNC_TRAFFIC_ON)) {
|
|
return ;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* split up the FIFO and reinitialize the queues
|
|
*/
|
|
formac_reinit_tx(smc) ;
|
|
}
|
|
|
|
#endif /* ESS */
|
|
|
|
#endif /* no SLIM_SMT */
|
|
|