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linux_dsm_epyc7002/drivers/net/fddi/skfp/ecm.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/******************************************************************************
*
* (C)Copyright 1998,1999 SysKonnect,
* a business unit of Schneider & Koch & Co. Datensysteme GmbH.
*
* See the file "skfddi.c" for further information.
*
* 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_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 */
/*
* 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"
} ;
/*
* 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 event %s",
smc->mib.fddiSMTECMState & AFLAG ? "ACTIONS " : "",
ecm_states[smc->mib.fddiSMTECMState & ~AFLAG],
ecm_events[event]);
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 */
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");
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 %lu", smc->e.trace_prop);
DB_ECM("ECM : prop_actions - in %d out %d", port_in, port_out);
if (smc->e.trace_prop & ENTITY_BIT(ENTITY_MAC)) {
/* trace initiatior */
DB_ECM("ECM : initiate TRACE on PHY %c", 'A' + port_in - PA);
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");
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");
queue_event(smc,EVENT_PCMA,PC_TRACE) ;
}
else {
/* signal trace termination */
DB_ECM("ECM : TRACE terminated");
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",
smc->e.trace_prop);
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");
}
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");
smc->e.path_test = PT_PENDING ;
}
else {
/* trace propagate upstream */
DB_ECM("ECM : propagate TRACE on PHY %d", upstream);
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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