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linux_dsm_epyc7002/drivers/net/fddi/skfp/rmt.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

647 lines
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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 RMT
Ring Management
*/
/*
* 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_ma_control()
* sm_mac_check_beacon_claim()
*
* The following HW dependent events are required :
* RM_RING_OP
* RM_RING_NON_OP
* RM_MY_BEACON
* RM_OTHER_BEACON
* RM_MY_CLAIM
* RM_TRT_EXP
* RM_VALID_CLAIM
*
*/
#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[] = "@(#)rmt.c 2.13 99/07/02 (C) SK " ;
#endif
/*
* FSM Macros
*/
#define AFLAG 0x10
#define GO_STATE(x) (smc->mib.m[MAC0].fddiMACRMTState = (x)|AFLAG)
#define ACTIONS_DONE() (smc->mib.m[MAC0].fddiMACRMTState &= ~AFLAG)
#define ACTIONS(x) (x|AFLAG)
#define RM0_ISOLATED 0
#define RM1_NON_OP 1 /* not operational */
#define RM2_RING_OP 2 /* ring operational */
#define RM3_DETECT 3 /* detect dupl addresses */
#define RM4_NON_OP_DUP 4 /* dupl. addr detected */
#define RM5_RING_OP_DUP 5 /* ring oper. with dupl. addr */
#define RM6_DIRECTED 6 /* sending directed beacons */
#define RM7_TRACE 7 /* trace initiated */
/*
* symbolic state names
*/
static const char * const rmt_states[] = {
"RM0_ISOLATED","RM1_NON_OP","RM2_RING_OP","RM3_DETECT",
"RM4_NON_OP_DUP","RM5_RING_OP_DUP","RM6_DIRECTED",
"RM7_TRACE"
} ;
/*
* symbolic event names
*/
static const char * const rmt_events[] = {
"NONE","RM_RING_OP","RM_RING_NON_OP","RM_MY_BEACON",
"RM_OTHER_BEACON","RM_MY_CLAIM","RM_TRT_EXP","RM_VALID_CLAIM",
"RM_JOIN","RM_LOOP","RM_DUP_ADDR","RM_ENABLE_FLAG",
"RM_TIMEOUT_NON_OP","RM_TIMEOUT_T_STUCK",
"RM_TIMEOUT_ANNOUNCE","RM_TIMEOUT_T_DIRECT",
"RM_TIMEOUT_D_MAX","RM_TIMEOUT_POLL","RM_TX_STATE_CHANGE"
} ;
/*
* Globals
* in struct s_rmt
*/
/*
* function declarations
*/
static void rmt_fsm(struct s_smc *smc, int cmd);
static void start_rmt_timer0(struct s_smc *smc, u_long value, int event);
static void start_rmt_timer1(struct s_smc *smc, u_long value, int event);
static void start_rmt_timer2(struct s_smc *smc, u_long value, int event);
static void stop_rmt_timer0(struct s_smc *smc);
static void stop_rmt_timer1(struct s_smc *smc);
static void stop_rmt_timer2(struct s_smc *smc);
static void rmt_dup_actions(struct s_smc *smc);
static void rmt_reinsert_actions(struct s_smc *smc);
static void rmt_leave_actions(struct s_smc *smc);
static void rmt_new_dup_actions(struct s_smc *smc);
#ifndef SUPERNET_3
extern void restart_trt_for_dbcn() ;
#endif /*SUPERNET_3*/
/*
init RMT state machine
clear all RMT vars and flags
*/
void rmt_init(struct s_smc *smc)
{
smc->mib.m[MAC0].fddiMACRMTState = ACTIONS(RM0_ISOLATED) ;
smc->r.dup_addr_test = DA_NONE ;
smc->r.da_flag = 0 ;
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = FALSE ;
smc->r.sm_ma_avail = FALSE ;
smc->r.loop_avail = 0 ;
smc->r.bn_flag = 0 ;
smc->r.jm_flag = 0 ;
smc->r.no_flag = TRUE ;
}
/*
RMT state machine
called by dispatcher
do
display state change
process event
until SM is stable
*/
void rmt(struct s_smc *smc, int event)
{
int state ;
do {
DB_RMT("RMT : state %s%s event %s",
smc->mib.m[MAC0].fddiMACRMTState & AFLAG ? "ACTIONS " : "",
rmt_states[smc->mib.m[MAC0].fddiMACRMTState & ~AFLAG],
rmt_events[event]);
state = smc->mib.m[MAC0].fddiMACRMTState ;
rmt_fsm(smc,event) ;
event = 0 ;
} while (state != smc->mib.m[MAC0].fddiMACRMTState) ;
rmt_state_change(smc,(int)smc->mib.m[MAC0].fddiMACRMTState) ;
}
/*
process RMT event
*/
static void rmt_fsm(struct s_smc *smc, int cmd)
{
/*
* RM00-RM70 : from all states
*/
if (!smc->r.rm_join && !smc->r.rm_loop &&
smc->mib.m[MAC0].fddiMACRMTState != ACTIONS(RM0_ISOLATED) &&
smc->mib.m[MAC0].fddiMACRMTState != RM0_ISOLATED) {
RS_SET(smc,RS_NORINGOP) ;
rmt_indication(smc,0) ;
GO_STATE(RM0_ISOLATED) ;
return ;
}
switch(smc->mib.m[MAC0].fddiMACRMTState) {
case ACTIONS(RM0_ISOLATED) :
stop_rmt_timer0(smc) ;
stop_rmt_timer1(smc) ;
stop_rmt_timer2(smc) ;
/*
* Disable MAC.
*/
sm_ma_control(smc,MA_OFFLINE) ;
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = FALSE ;
smc->r.loop_avail = FALSE ;
smc->r.sm_ma_avail = FALSE ;
smc->r.no_flag = TRUE ;
DB_RMTN(1, "RMT : ISOLATED");
ACTIONS_DONE() ;
break ;
case RM0_ISOLATED :
/*RM01*/
if (smc->r.rm_join || smc->r.rm_loop) {
/*
* According to the standard the MAC must be reset
* here. The FORMAC will be initialized and Claim
* and Beacon Frames will be uploaded to the MAC.
* So any change of Treq will take effect NOW.
*/
sm_ma_control(smc,MA_RESET) ;
GO_STATE(RM1_NON_OP) ;
break ;
}
break ;
case ACTIONS(RM1_NON_OP) :
start_rmt_timer0(smc,smc->s.rmt_t_non_op,RM_TIMEOUT_NON_OP) ;
stop_rmt_timer1(smc) ;
stop_rmt_timer2(smc) ;
sm_ma_control(smc,MA_BEACON) ;
DB_RMTN(1, "RMT : RING DOWN");
RS_SET(smc,RS_NORINGOP) ;
smc->r.sm_ma_avail = FALSE ;
rmt_indication(smc,0) ;
ACTIONS_DONE() ;
break ;
case RM1_NON_OP :
/*RM12*/
if (cmd == RM_RING_OP) {
RS_SET(smc,RS_RINGOPCHANGE) ;
GO_STATE(RM2_RING_OP) ;
break ;
}
/*RM13*/
else if (cmd == RM_TIMEOUT_NON_OP) {
smc->r.bn_flag = FALSE ;
smc->r.no_flag = TRUE ;
GO_STATE(RM3_DETECT) ;
break ;
}
break ;
case ACTIONS(RM2_RING_OP) :
stop_rmt_timer0(smc) ;
stop_rmt_timer1(smc) ;
stop_rmt_timer2(smc) ;
smc->r.no_flag = FALSE ;
if (smc->r.rm_loop)
smc->r.loop_avail = TRUE ;
if (smc->r.rm_join) {
smc->r.sm_ma_avail = TRUE ;
if (smc->mib.m[MAC0].fddiMACMA_UnitdataEnable)
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = TRUE ;
else
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = FALSE ;
}
DB_RMTN(1, "RMT : RING UP");
RS_CLEAR(smc,RS_NORINGOP) ;
RS_SET(smc,RS_RINGOPCHANGE) ;
rmt_indication(smc,1) ;
smt_stat_counter(smc,0) ;
ACTIONS_DONE() ;
break ;
case RM2_RING_OP :
/*RM21*/
if (cmd == RM_RING_NON_OP) {
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = FALSE ;
smc->r.loop_avail = FALSE ;
RS_SET(smc,RS_RINGOPCHANGE) ;
GO_STATE(RM1_NON_OP) ;
break ;
}
/*RM22a*/
else if (cmd == RM_ENABLE_FLAG) {
if (smc->mib.m[MAC0].fddiMACMA_UnitdataEnable)
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = TRUE ;
else
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = FALSE ;
}
/*RM25*/
else if (smc->r.dup_addr_test == DA_FAILED) {
smc->mib.m[MAC0].fddiMACMA_UnitdataAvailable = FALSE ;
smc->r.loop_avail = FALSE ;
smc->r.da_flag = TRUE ;
GO_STATE(RM5_RING_OP_DUP) ;
break ;
}
break ;
case ACTIONS(RM3_DETECT) :
start_rmt_timer0(smc,smc->s.mac_d_max*2,RM_TIMEOUT_D_MAX) ;
start_rmt_timer1(smc,smc->s.rmt_t_stuck,RM_TIMEOUT_T_STUCK) ;
start_rmt_timer2(smc,smc->s.rmt_t_poll,RM_TIMEOUT_POLL) ;
sm_mac_check_beacon_claim(smc) ;
DB_RMTN(1, "RMT : RM3_DETECT");
ACTIONS_DONE() ;
break ;
case RM3_DETECT :
if (cmd == RM_TIMEOUT_POLL) {
start_rmt_timer2(smc,smc->s.rmt_t_poll,RM_TIMEOUT_POLL);
sm_mac_check_beacon_claim(smc) ;
break ;
}
if (cmd == RM_TIMEOUT_D_MAX) {
smc->r.timer0_exp = TRUE ;
}
/*
*jd(22-Feb-1999)
* We need a time ">= 2*mac_d_max" since we had finished
* Claim or Beacon state. So we will restart timer0 at
* every state change.
*/
if (cmd == RM_TX_STATE_CHANGE) {
start_rmt_timer0(smc,
smc->s.mac_d_max*2,
RM_TIMEOUT_D_MAX) ;
}
/*RM32*/
if (cmd == RM_RING_OP) {
GO_STATE(RM2_RING_OP) ;
break ;
}
/*RM33a*/
else if ((cmd == RM_MY_BEACON || cmd == RM_OTHER_BEACON)
&& smc->r.bn_flag) {
smc->r.bn_flag = FALSE ;
}
/*RM33b*/
else if (cmd == RM_TRT_EXP && !smc->r.bn_flag) {
int tx ;
/*
* set bn_flag only if in state T4 or T5:
* only if we're the beaconer should we start the
* trace !
*/
if ((tx = sm_mac_get_tx_state(smc)) == 4 || tx == 5) {
DB_RMTN(2, "RMT : DETECT && TRT_EXPIRED && T4/T5");
smc->r.bn_flag = TRUE ;
/*
* If one of the upstream stations beaconed
* and the link to the upstream neighbor is
* lost we need to restart the stuck timer to
* check the "stuck beacon" condition.
*/
start_rmt_timer1(smc,smc->s.rmt_t_stuck,
RM_TIMEOUT_T_STUCK) ;
}
/*
* We do NOT need to clear smc->r.bn_flag in case of
* not being in state T4 or T5, because the flag
* must be cleared in order to get in this condition.
*/
DB_RMTN(2, "RMT : sm_mac_get_tx_state() = %d (bn_flag = %d)",
tx, smc->r.bn_flag);
}
/*RM34a*/
else if (cmd == RM_MY_CLAIM && smc->r.timer0_exp) {
rmt_new_dup_actions(smc) ;
GO_STATE(RM4_NON_OP_DUP) ;
break ;
}
/*RM34b*/
else if (cmd == RM_MY_BEACON && smc->r.timer0_exp) {
rmt_new_dup_actions(smc) ;
GO_STATE(RM4_NON_OP_DUP) ;
break ;
}
/*RM34c*/
else if (cmd == RM_VALID_CLAIM) {
rmt_new_dup_actions(smc) ;
GO_STATE(RM4_NON_OP_DUP) ;
break ;
}
/*RM36*/
else if (cmd == RM_TIMEOUT_T_STUCK &&
smc->r.rm_join && smc->r.bn_flag) {
GO_STATE(RM6_DIRECTED) ;
break ;
}
break ;
case ACTIONS(RM4_NON_OP_DUP) :
start_rmt_timer0(smc,smc->s.rmt_t_announce,RM_TIMEOUT_ANNOUNCE);
start_rmt_timer1(smc,smc->s.rmt_t_stuck,RM_TIMEOUT_T_STUCK) ;
start_rmt_timer2(smc,smc->s.rmt_t_poll,RM_TIMEOUT_POLL) ;
sm_mac_check_beacon_claim(smc) ;
DB_RMTN(1, "RMT : RM4_NON_OP_DUP");
ACTIONS_DONE() ;
break ;
case RM4_NON_OP_DUP :
if (cmd == RM_TIMEOUT_POLL) {
start_rmt_timer2(smc,smc->s.rmt_t_poll,RM_TIMEOUT_POLL);
sm_mac_check_beacon_claim(smc) ;
break ;
}
/*RM41*/
if (!smc->r.da_flag) {
GO_STATE(RM1_NON_OP) ;
break ;
}
/*RM44a*/
else if ((cmd == RM_MY_BEACON || cmd == RM_OTHER_BEACON) &&
smc->r.bn_flag) {
smc->r.bn_flag = FALSE ;
}
/*RM44b*/
else if (cmd == RM_TRT_EXP && !smc->r.bn_flag) {
int tx ;
/*
* set bn_flag only if in state T4 or T5:
* only if we're the beaconer should we start the
* trace !
*/
if ((tx = sm_mac_get_tx_state(smc)) == 4 || tx == 5) {
DB_RMTN(2, "RMT : NOPDUP && TRT_EXPIRED && T4/T5");
smc->r.bn_flag = TRUE ;
/*
* If one of the upstream stations beaconed
* and the link to the upstream neighbor is
* lost we need to restart the stuck timer to
* check the "stuck beacon" condition.
*/
start_rmt_timer1(smc,smc->s.rmt_t_stuck,
RM_TIMEOUT_T_STUCK) ;
}
/*
* We do NOT need to clear smc->r.bn_flag in case of
* not being in state T4 or T5, because the flag
* must be cleared in order to get in this condition.
*/
DB_RMTN(2, "RMT : sm_mac_get_tx_state() = %d (bn_flag = %d)",
tx, smc->r.bn_flag);
}
/*RM44c*/
else if (cmd == RM_TIMEOUT_ANNOUNCE && !smc->r.bn_flag) {
rmt_dup_actions(smc) ;
}
/*RM45*/
else if (cmd == RM_RING_OP) {
smc->r.no_flag = FALSE ;
GO_STATE(RM5_RING_OP_DUP) ;
break ;
}
/*RM46*/
else if (cmd == RM_TIMEOUT_T_STUCK &&
smc->r.rm_join && smc->r.bn_flag) {
GO_STATE(RM6_DIRECTED) ;
break ;
}
break ;
case ACTIONS(RM5_RING_OP_DUP) :
stop_rmt_timer0(smc) ;
stop_rmt_timer1(smc) ;
stop_rmt_timer2(smc) ;
DB_RMTN(1, "RMT : RM5_RING_OP_DUP");
ACTIONS_DONE() ;
break;
case RM5_RING_OP_DUP :
/*RM52*/
if (smc->r.dup_addr_test == DA_PASSED) {
smc->r.da_flag = FALSE ;
GO_STATE(RM2_RING_OP) ;
break ;
}
/*RM54*/
else if (cmd == RM_RING_NON_OP) {
smc->r.jm_flag = FALSE ;
smc->r.bn_flag = FALSE ;
GO_STATE(RM4_NON_OP_DUP) ;
break ;
}
break ;
case ACTIONS(RM6_DIRECTED) :
start_rmt_timer0(smc,smc->s.rmt_t_direct,RM_TIMEOUT_T_DIRECT) ;
stop_rmt_timer1(smc) ;
start_rmt_timer2(smc,smc->s.rmt_t_poll,RM_TIMEOUT_POLL) ;
sm_ma_control(smc,MA_DIRECTED) ;
RS_SET(smc,RS_BEACON) ;
DB_RMTN(1, "RMT : RM6_DIRECTED");
ACTIONS_DONE() ;
break ;
case RM6_DIRECTED :
/*RM63*/
if (cmd == RM_TIMEOUT_POLL) {
start_rmt_timer2(smc,smc->s.rmt_t_poll,RM_TIMEOUT_POLL);
sm_mac_check_beacon_claim(smc) ;
#ifndef SUPERNET_3
/* Because of problems with the Supernet II chip set
* sending of Directed Beacon will stop after 165ms
* therefore restart_trt_for_dbcn(smc) will be called
* to prevent this.
*/
restart_trt_for_dbcn(smc) ;
#endif /*SUPERNET_3*/
break ;
}
if ((cmd == RM_MY_BEACON || cmd == RM_OTHER_BEACON) &&
!smc->r.da_flag) {
smc->r.bn_flag = FALSE ;
GO_STATE(RM3_DETECT) ;
break ;
}
/*RM64*/
else if ((cmd == RM_MY_BEACON || cmd == RM_OTHER_BEACON) &&
smc->r.da_flag) {
smc->r.bn_flag = FALSE ;
GO_STATE(RM4_NON_OP_DUP) ;
break ;
}
/*RM67*/
else if (cmd == RM_TIMEOUT_T_DIRECT) {
GO_STATE(RM7_TRACE) ;
break ;
}
break ;
case ACTIONS(RM7_TRACE) :
stop_rmt_timer0(smc) ;
stop_rmt_timer1(smc) ;
stop_rmt_timer2(smc) ;
smc->e.trace_prop |= ENTITY_BIT(ENTITY_MAC) ;
queue_event(smc,EVENT_ECM,EC_TRACE_PROP) ;
DB_RMTN(1, "RMT : RM7_TRACE");
ACTIONS_DONE() ;
break ;
case RM7_TRACE :
break ;
default:
SMT_PANIC(smc,SMT_E0122, SMT_E0122_MSG) ;
break;
}
}
/*
* (jd) RMT duplicate address actions
* leave the ring or reinsert just as configured
*/
static void rmt_dup_actions(struct s_smc *smc)
{
if (smc->r.jm_flag) {
}
else {
if (smc->s.rmt_dup_mac_behavior) {
SMT_ERR_LOG(smc,SMT_E0138, SMT_E0138_MSG) ;
rmt_reinsert_actions(smc) ;
}
else {
SMT_ERR_LOG(smc,SMT_E0135, SMT_E0135_MSG) ;
rmt_leave_actions(smc) ;
}
}
}
/*
* Reconnect to the Ring
*/
static void rmt_reinsert_actions(struct s_smc *smc)
{
queue_event(smc,EVENT_ECM,EC_DISCONNECT) ;
queue_event(smc,EVENT_ECM,EC_CONNECT) ;
}
/*
* duplicate address detected
*/
static void rmt_new_dup_actions(struct s_smc *smc)
{
smc->r.da_flag = TRUE ;
smc->r.bn_flag = FALSE ;
smc->r.jm_flag = FALSE ;
/*
* we have three options : change address, jam or leave
* we leave the ring as default
* Optionally it's possible to reinsert after leaving the Ring
* but this will not conform with SMT Spec.
*/
if (smc->s.rmt_dup_mac_behavior) {
SMT_ERR_LOG(smc,SMT_E0138, SMT_E0138_MSG) ;
rmt_reinsert_actions(smc) ;
}
else {
SMT_ERR_LOG(smc,SMT_E0135, SMT_E0135_MSG) ;
rmt_leave_actions(smc) ;
}
}
/*
* leave the ring
*/
static void rmt_leave_actions(struct s_smc *smc)
{
queue_event(smc,EVENT_ECM,EC_DISCONNECT) ;
/*
* Note: Do NOT try again later. (with please reconnect)
* The station must be left from the ring!
*/
}
/*
* SMT timer interface
* start RMT timer 0
*/
static void start_rmt_timer0(struct s_smc *smc, u_long value, int event)
{
smc->r.timer0_exp = FALSE ; /* clear timer event flag */
smt_timer_start(smc,&smc->r.rmt_timer0,value,EV_TOKEN(EVENT_RMT,event));
}
/*
* SMT timer interface
* start RMT timer 1
*/
static void start_rmt_timer1(struct s_smc *smc, u_long value, int event)
{
smc->r.timer1_exp = FALSE ; /* clear timer event flag */
smt_timer_start(smc,&smc->r.rmt_timer1,value,EV_TOKEN(EVENT_RMT,event));
}
/*
* SMT timer interface
* start RMT timer 2
*/
static void start_rmt_timer2(struct s_smc *smc, u_long value, int event)
{
smc->r.timer2_exp = FALSE ; /* clear timer event flag */
smt_timer_start(smc,&smc->r.rmt_timer2,value,EV_TOKEN(EVENT_RMT,event));
}
/*
* SMT timer interface
* stop RMT timer 0
*/
static void stop_rmt_timer0(struct s_smc *smc)
{
if (smc->r.rmt_timer0.tm_active)
smt_timer_stop(smc,&smc->r.rmt_timer0) ;
}
/*
* SMT timer interface
* stop RMT timer 1
*/
static void stop_rmt_timer1(struct s_smc *smc)
{
if (smc->r.rmt_timer1.tm_active)
smt_timer_stop(smc,&smc->r.rmt_timer1) ;
}
/*
* SMT timer interface
* stop RMT timer 2
*/
static void stop_rmt_timer2(struct s_smc *smc)
{
if (smc->r.rmt_timer2.tm_active)
smt_timer_stop(smc,&smc->r.rmt_timer2) ;
}
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