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linux/drivers/net/skfp/ecm.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

536 lines
13 KiB
C
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/******************************************************************************
*
* (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 ECM
Entity Coordination Management
Hardware independent state machine
*/
/*
* Hardware independent state machine implemantation
* The following external SMT functions are referenced :
*
* queue_event()
* smt_timer_start()
* smt_timer_stop()
*
* The following external HW dependent functions are referenced :
* sm_pm_bypass_req()
* sm_pm_ls_latch()
* sm_pm_get_ls()
*
* 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[] = "@(#)ecm.c 2.7 99/08/05 (C) SK " ;
#endif
/*
* FSM Macros
*/
#define AFLAG 0x10
#define GO_STATE(x) (smc->mib.fddiSMTECMState = (x)|AFLAG)
#define ACTIONS_DONE() (smc->mib.fddiSMTECMState &= ~AFLAG)
#define ACTIONS(x) (x|AFLAG)
#define EC0_OUT 0 /* not inserted */
#define EC1_IN 1 /* inserted */
#define EC2_TRACE 2 /* tracing */
#define EC3_LEAVE 3 /* leaving the ring */
#define EC4_PATH_TEST 4 /* performing path test */
#define EC5_INSERT 5 /* bypass being turned on */
#define EC6_CHECK 6 /* checking bypass */
#define EC7_DEINSERT 7 /* bypass being turnde off */
#ifdef DEBUG
/*
* symbolic state names
*/
static const char * const ecm_states[] = {
"EC0_OUT","EC1_IN","EC2_TRACE","EC3_LEAVE","EC4_PATH_TEST",
"EC5_INSERT","EC6_CHECK","EC7_DEINSERT"
} ;
/*
* symbolic event names
*/
static const char * const ecm_events[] = {
"NONE","EC_CONNECT","EC_DISCONNECT","EC_TRACE_PROP","EC_PATH_TEST",
"EC_TIMEOUT_TD","EC_TIMEOUT_TMAX",
"EC_TIMEOUT_IMAX","EC_TIMEOUT_INMAX","EC_TEST_DONE"
} ;
#endif
/*
* all Globals are defined in smc.h
* struct s_ecm
*/
/*
* function declarations
*/
static void ecm_fsm(struct s_smc *smc, int cmd);
static void start_ecm_timer(struct s_smc *smc, u_long value, int event);
static void stop_ecm_timer(struct s_smc *smc);
static void prop_actions(struct s_smc *smc);
/*
init ECM state machine
clear all ECM vars and flags
*/
void ecm_init(struct s_smc *smc)
{
smc->e.path_test = PT_PASSED ;
smc->e.trace_prop = 0 ;
smc->e.sb_flag = 0 ;
smc->mib.fddiSMTECMState = ACTIONS(EC0_OUT) ;
smc->e.ecm_line_state = FALSE ;
}
/*
ECM state machine
called by dispatcher
do
display state change
process event
until SM is stable
*/
void ecm(struct s_smc *smc, int event)
{
int state ;
do {
DB_ECM("ECM : state %s%s",
(smc->mib.fddiSMTECMState & AFLAG) ? "ACTIONS " : "",
ecm_states[smc->mib.fddiSMTECMState & ~AFLAG]) ;
DB_ECM(" event %s\n",ecm_events[event],0) ;
state = smc->mib.fddiSMTECMState ;
ecm_fsm(smc,event) ;
event = 0 ;
} while (state != smc->mib.fddiSMTECMState) ;
ecm_state_change(smc,(int)smc->mib.fddiSMTECMState) ;
}
/*
process ECM event
*/
static void ecm_fsm(struct s_smc *smc, int cmd)
{
int ls_a ; /* current line state PHY A */
int ls_b ; /* current line state PHY B */
int p ; /* ports */
smc->mib.fddiSMTBypassPresent = sm_pm_bypass_present(smc) ;
if (cmd == EC_CONNECT)
smc->mib.fddiSMTRemoteDisconnectFlag = FALSE ;
/* For AIX event notification: */
/* Is a disconnect command remotely issued ? */
if (cmd == EC_DISCONNECT &&
smc->mib.fddiSMTRemoteDisconnectFlag == TRUE)
AIX_EVENT (smc, (u_long) CIO_HARD_FAIL, (u_long)
FDDI_REMOTE_DISCONNECT, smt_get_event_word(smc),
smt_get_error_word(smc) );
/*jd 05-Aug-1999 Bug #10419 "Port Disconnect fails at Dup MAc Cond."*/
if (cmd == EC_CONNECT) {
smc->e.DisconnectFlag = FALSE ;
}
else if (cmd == EC_DISCONNECT) {
smc->e.DisconnectFlag = TRUE ;
}
switch(smc->mib.fddiSMTECMState) {
case ACTIONS(EC0_OUT) :
/*
* We do not perform a path test
*/
smc->e.path_test = PT_PASSED ;
smc->e.ecm_line_state = FALSE ;
stop_ecm_timer(smc) ;
ACTIONS_DONE() ;
break ;
case EC0_OUT:
/*EC01*/
if (cmd == EC_CONNECT && !smc->mib.fddiSMTBypassPresent
&& smc->e.path_test==PT_PASSED) {
GO_STATE(EC1_IN) ;
break ;
}
/*EC05*/
else if (cmd == EC_CONNECT && (smc->e.path_test==PT_PASSED) &&
smc->mib.fddiSMTBypassPresent &&
(smc->s.sas == SMT_DAS)) {
GO_STATE(EC5_INSERT) ;
break ;
}
break;
case ACTIONS(EC1_IN) :
stop_ecm_timer(smc) ;
smc->e.trace_prop = 0 ;
sm_ma_control(smc,MA_TREQ) ;
for (p = 0 ; p < NUMPHYS ; p++)
if (smc->mib.p[p].fddiPORTHardwarePresent)
queue_event(smc,EVENT_PCMA+p,PC_START) ;
ACTIONS_DONE() ;
break ;
case EC1_IN:
/*EC12*/
if (cmd == EC_TRACE_PROP) {
prop_actions(smc) ;
GO_STATE(EC2_TRACE) ;
break ;
}
/*EC13*/
else if (cmd == EC_DISCONNECT) {
GO_STATE(EC3_LEAVE) ;
break ;
}
break;
case ACTIONS(EC2_TRACE) :
start_ecm_timer(smc,MIB2US(smc->mib.fddiSMTTrace_MaxExpiration),
EC_TIMEOUT_TMAX) ;
ACTIONS_DONE() ;
break ;
case EC2_TRACE :
/*EC22*/
if (cmd == EC_TRACE_PROP) {
prop_actions(smc) ;
GO_STATE(EC2_TRACE) ;
break ;
}
/*EC23a*/
else if (cmd == EC_DISCONNECT) {
smc->e.path_test = PT_EXITING ;
GO_STATE(EC3_LEAVE) ;
break ;
}
/*EC23b*/
else if (smc->e.path_test == PT_PENDING) {
GO_STATE(EC3_LEAVE) ;
break ;
}
/*EC23c*/
else if (cmd == EC_TIMEOUT_TMAX) {
/* Trace_Max is expired */
/* -> send AIX_EVENT */
AIX_EVENT(smc, (u_long) FDDI_RING_STATUS,
(u_long) FDDI_SMT_ERROR, (u_long)
FDDI_TRACE_MAX, smt_get_error_word(smc));
smc->e.path_test = PT_PENDING ;
GO_STATE(EC3_LEAVE) ;
break ;
}
break ;
case ACTIONS(EC3_LEAVE) :
start_ecm_timer(smc,smc->s.ecm_td_min,EC_TIMEOUT_TD) ;
for (p = 0 ; p < NUMPHYS ; p++)
queue_event(smc,EVENT_PCMA+p,PC_STOP) ;
ACTIONS_DONE() ;
break ;
case EC3_LEAVE:
/*EC30*/
if (cmd == EC_TIMEOUT_TD && !smc->mib.fddiSMTBypassPresent &&
(smc->e.path_test != PT_PENDING)) {
GO_STATE(EC0_OUT) ;
break ;
}
/*EC34*/
else if (cmd == EC_TIMEOUT_TD &&
(smc->e.path_test == PT_PENDING)) {
GO_STATE(EC4_PATH_TEST) ;
break ;
}
/*EC31*/
else if (cmd == EC_CONNECT && smc->e.path_test == PT_PASSED) {
GO_STATE(EC1_IN) ;
break ;
}
/*EC33*/
else if (cmd == EC_DISCONNECT &&
smc->e.path_test == PT_PENDING) {
smc->e.path_test = PT_EXITING ;
/*
* stay in state - state will be left via timeout
*/
}
/*EC37*/
else if (cmd == EC_TIMEOUT_TD &&
smc->mib.fddiSMTBypassPresent &&
smc->e.path_test != PT_PENDING) {
GO_STATE(EC7_DEINSERT) ;
break ;
}
break ;
case ACTIONS(EC4_PATH_TEST) :
stop_ecm_timer(smc) ;
smc->e.path_test = PT_TESTING ;
start_ecm_timer(smc,smc->s.ecm_test_done,EC_TEST_DONE) ;
/* now perform path test ... just a simulation */
ACTIONS_DONE() ;
break ;
case EC4_PATH_TEST :
/* path test done delay */
if (cmd == EC_TEST_DONE)
smc->e.path_test = PT_PASSED ;
if (smc->e.path_test == PT_FAILED)
RS_SET(smc,RS_PATHTEST) ;
/*EC40a*/
if (smc->e.path_test == PT_FAILED &&
!smc->mib.fddiSMTBypassPresent) {
GO_STATE(EC0_OUT) ;
break ;
}
/*EC40b*/
else if (cmd == EC_DISCONNECT &&
!smc->mib.fddiSMTBypassPresent) {
GO_STATE(EC0_OUT) ;
break ;
}
/*EC41*/
else if (smc->e.path_test == PT_PASSED) {
GO_STATE(EC1_IN) ;
break ;
}
/*EC47a*/
else if (smc->e.path_test == PT_FAILED &&
smc->mib.fddiSMTBypassPresent) {
GO_STATE(EC7_DEINSERT) ;
break ;
}
/*EC47b*/
else if (cmd == EC_DISCONNECT &&
smc->mib.fddiSMTBypassPresent) {
GO_STATE(EC7_DEINSERT) ;
break ;
}
break ;
case ACTIONS(EC5_INSERT) :
sm_pm_bypass_req(smc,BP_INSERT);
start_ecm_timer(smc,smc->s.ecm_in_max,EC_TIMEOUT_INMAX) ;
ACTIONS_DONE() ;
break ;
case EC5_INSERT :
/*EC56*/
if (cmd == EC_TIMEOUT_INMAX) {
GO_STATE(EC6_CHECK) ;
break ;
}
/*EC57*/
else if (cmd == EC_DISCONNECT) {
GO_STATE(EC7_DEINSERT) ;
break ;
}
break ;
case ACTIONS(EC6_CHECK) :
/*
* in EC6_CHECK, we *POLL* the line state !
* check whether both bypass switches have switched.
*/
start_ecm_timer(smc,smc->s.ecm_check_poll,0) ;
smc->e.ecm_line_state = TRUE ; /* flag to pcm: report Q/HLS */
(void) sm_pm_ls_latch(smc,PA,1) ; /* enable line state latch */
(void) sm_pm_ls_latch(smc,PB,1) ; /* enable line state latch */
ACTIONS_DONE() ;
break ;
case EC6_CHECK :
ls_a = sm_pm_get_ls(smc,PA) ;
ls_b = sm_pm_get_ls(smc,PB) ;
/*EC61*/
if (((ls_a == PC_QLS) || (ls_a == PC_HLS)) &&
((ls_b == PC_QLS) || (ls_b == PC_HLS)) ) {
smc->e.sb_flag = FALSE ;
smc->e.ecm_line_state = FALSE ;
GO_STATE(EC1_IN) ;
break ;
}
/*EC66*/
else if (!smc->e.sb_flag &&
(((ls_a == PC_ILS) && (ls_b == PC_QLS)) ||
((ls_a == PC_QLS) && (ls_b == PC_ILS)))){
smc->e.sb_flag = TRUE ;
DB_ECMN(1,"ECM : EC6_CHECK - stuck bypass\n",0,0) ;
AIX_EVENT(smc, (u_long) FDDI_RING_STATUS, (u_long)
FDDI_SMT_ERROR, (u_long) FDDI_BYPASS_STUCK,
smt_get_error_word(smc));
}
/*EC67*/
else if (cmd == EC_DISCONNECT) {
smc->e.ecm_line_state = FALSE ;
GO_STATE(EC7_DEINSERT) ;
break ;
}
else {
/*
* restart poll
*/
start_ecm_timer(smc,smc->s.ecm_check_poll,0) ;
}
break ;
case ACTIONS(EC7_DEINSERT) :
sm_pm_bypass_req(smc,BP_DEINSERT);
start_ecm_timer(smc,smc->s.ecm_i_max,EC_TIMEOUT_IMAX) ;
ACTIONS_DONE() ;
break ;
case EC7_DEINSERT:
/*EC70*/
if (cmd == EC_TIMEOUT_IMAX) {
GO_STATE(EC0_OUT) ;
break ;
}
/*EC75*/
else if (cmd == EC_CONNECT && smc->e.path_test == PT_PASSED) {
GO_STATE(EC5_INSERT) ;
break ;
}
break;
default:
SMT_PANIC(smc,SMT_E0107, SMT_E0107_MSG) ;
break;
}
}
#ifndef CONCENTRATOR
/*
* trace propagation actions for SAS & DAS
*/
static void prop_actions(struct s_smc *smc)
{
int port_in = 0 ;
int port_out = 0 ;
RS_SET(smc,RS_EVENT) ;
switch (smc->s.sas) {
case SMT_SAS :
port_in = port_out = pcm_get_s_port(smc) ;
break ;
case SMT_DAS :
port_in = cfm_get_mac_input(smc) ; /* PA or PB */
port_out = cfm_get_mac_output(smc) ; /* PA or PB */
break ;
case SMT_NAC :
SMT_PANIC(smc,SMT_E0108, SMT_E0108_MSG) ;
return ;
}
DB_ECM("ECM : prop_actions - trace_prop %d\n", smc->e.trace_prop,0) ;
DB_ECM("ECM : prop_actions - in %d out %d\n", port_in,port_out) ;
if (smc->e.trace_prop & ENTITY_BIT(ENTITY_MAC)) {
/* trace initiatior */
DB_ECM("ECM : initiate TRACE on PHY %c\n",'A'+port_in-PA,0) ;
queue_event(smc,EVENT_PCM+port_in,PC_TRACE) ;
}
else if ((smc->e.trace_prop & ENTITY_BIT(ENTITY_PHY(PA))) &&
port_out != PA) {
/* trace propagate upstream */
DB_ECM("ECM : propagate TRACE on PHY B\n",0,0) ;
queue_event(smc,EVENT_PCMB,PC_TRACE) ;
}
else if ((smc->e.trace_prop & ENTITY_BIT(ENTITY_PHY(PB))) &&
port_out != PB) {
/* trace propagate upstream */
DB_ECM("ECM : propagate TRACE on PHY A\n",0,0) ;
queue_event(smc,EVENT_PCMA,PC_TRACE) ;
}
else {
/* signal trace termination */
DB_ECM("ECM : TRACE terminated\n",0,0) ;
smc->e.path_test = PT_PENDING ;
}
smc->e.trace_prop = 0 ;
}
#else
/*
* trace propagation actions for Concentrator
*/
static void prop_actions(struct s_smc *smc)
{
int initiator ;
int upstream ;
int p ;
RS_SET(smc,RS_EVENT) ;
while (smc->e.trace_prop) {
DB_ECM("ECM : prop_actions - trace_prop %d\n",
smc->e.trace_prop,0) ;
if (smc->e.trace_prop & ENTITY_BIT(ENTITY_MAC)) {
initiator = ENTITY_MAC ;
smc->e.trace_prop &= ~ENTITY_BIT(ENTITY_MAC) ;
DB_ECM("ECM: MAC initiates trace\n",0,0) ;
}
else {
for (p = NUMPHYS-1 ; p >= 0 ; p--) {
if (smc->e.trace_prop &
ENTITY_BIT(ENTITY_PHY(p)))
break ;
}
initiator = ENTITY_PHY(p) ;
smc->e.trace_prop &= ~ENTITY_BIT(ENTITY_PHY(p)) ;
}
upstream = cem_get_upstream(smc,initiator) ;
if (upstream == ENTITY_MAC) {
/* signal trace termination */
DB_ECM("ECM : TRACE terminated\n",0,0) ;
smc->e.path_test = PT_PENDING ;
}
else {
/* trace propagate upstream */
DB_ECM("ECM : propagate TRACE on PHY %d\n",upstream,0) ;
queue_event(smc,EVENT_PCM+upstream,PC_TRACE) ;
}
}
}
#endif
/*
* SMT timer interface
* start ECM timer
*/
static void start_ecm_timer(struct s_smc *smc, u_long value, int event)
{
smt_timer_start(smc,&smc->e.ecm_timer,value,EV_TOKEN(EVENT_ECM,event));
}
/*
* SMT timer interface
* stop ECM timer
*/
static void stop_ecm_timer(struct s_smc *smc)
{
if (smc->e.ecm_timer.tm_active)
smt_timer_stop(smc,&smc->e.ecm_timer) ;
}
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