#!/bin/sh
#
# script for loading/unloading RTnet, RTmac/TMDA, and RTcap
#

prefix="@prefix@"
RTNETCFG="@sysconfdir@/rtnet.conf"


debug_func() {
    echo "$*"
    eval $*
}

usage() {
    cat << EOF
Usage:
    $0 [-cf <config-file>] [-v] [-c] {start|stop}
	Start or stop station according to configuration file

    $0 [-cf <config-file>] [-v] [-c] master <slave_ip1> [<slave_ip2> ...]
	Start station as master for given list of slaves

    $0 [-cf <config-file>] [-v] capture
	Start only passive realtime capturing

    The additional switch -v enables verbose output.
    The additional switch -c enables capturing mode to allow use of a network
	analyzer such as Wireshark (if rtnet was built with --enable-rtcap).
EOF
}

init_rtnet() {
    modprobe rtnet >/dev/null || exit 1
    modprobe rtipv4 >/dev/null || exit 1
    modprobe $RT_DRIVER $RT_DRIVER_OPTIONS >/dev/null || exit 1

    for dev in $REBIND_RT_NICS; do
	if [ -d /sys/bus/pci/devices/$dev/driver ]; then
	    echo $dev > /sys/bus/pci/devices/$dev/driver/unbind
	fi
	echo $dev > /sys/bus/pci/drivers/$RT_DRIVER/bind
    done

    for PROTOCOL in $RT_PROTOCOLS; do
	modprobe rt$PROTOCOL >/dev/null || exit 1
    done

    if [ $RT_LOOPBACK = "yes" ]; then
	modprobe rt_loopback >/dev/null || exit 1
    fi

    if [ $RTCAP = "yes" ]; then
	modprobe rtcap >/dev/null || exit 1
    fi

    if [ $RT_LOOPBACK = "yes" ]; then
	$RTIFCONFIG rtlo up 127.0.0.1
    fi

    if [ $RTCAP = "yes" ]; then
	ifconfig rteth0 up
	ifconfig rteth0-mac up
	if [ $RT_LOOPBACK = "yes" ]; then
	    ifconfig rtlo up
	fi
    fi

    modprobe rtcfg >/dev/null
    modprobe rtmac >/dev/null
    modprobe tdma >/dev/null
}

submit_cfg() {
    case "$STATION_TYPE" in
	master)
	    $RTIFCONFIG rteth0 up $STATION_IP

	    $TDMACFG rteth0 master $TDMA_CYCLE
	    eval "$TDMA_SLOTS"

	    IPADDR=$STATION_IP
	    NETMASK_OPT=
	    ;;
	slave)
	    if [ ! "$STATION_IP" = "" ]; then
		if [ ! "$STATION_MAC" = "" ]; then
		    RTCFG_CLIENT="$STATION_IP -hw $STATION_MAC"
		else
		    RTCFG_CLIENT="$STATION_IP"
		fi
	    else
		RTCFG_CLIENT="$STATION_MAC"
	    fi

	    ADD_STAGE1_CMDS="ifconfig vnic0 up $STATION_IP"

	    echo "$TDMA_SLOTS$ADD_STAGE1_CMDS" | \
		$RTCFG rteth0 add $RTCFG_CLIENT -stage1 -
	    ;;
	backup-master)
	    if [ ! "$STATION_IP" = "" ]; then
		if [ ! "$STATION_MAC" = "" ]; then
		    RTCFG_CLIENT="$STATION_IP -hw $STATION_MAC"
		else
		    RTCFG_CLIENT="$STATION_IP"
		fi
	    else
		RTCFG_CLIENT="$STATION_MAC"
	    fi

	    ADD_STAGE1_CMDS="ifconfig vnic0 up $STATION_IP"

	    STAGE_2_OPT=
	    if [ ! "$STATION_STAGE_2_SRC" = "" ]; then
		STAGE_2_OPT="-stage2 $STATION_STAGE_2_SRC"
	    fi

	    echo "\$TDMACFG rteth0 detach;\$TDMACFG rteth0 master $TDMA_CYCLE -b $TDMA_BACKUP_OFFS;$TDMA_SLOTS$ADD_STAGE1_CMDS" | \
		$RTCFG rteth0 add $RTCFG_CLIENT -stage1 - $STAGE_2_OPT
	    ;;
    esac

    STATION_TYPE=
    STATION_IP=
    STATION_MAC=
    STATION_STAGE_2_SRC=
    TDMA_SLOTS=
    TDMA_BACKUP_OFFS=
}

start_master() {
    $RTCFG rteth0 server

    STAGE_2_OPT=
    if [ ! "$STAGE_2_SRC" = "" ]; then
	STAGE_2_OPT="-stage2 $STAGE_2_SRC"
    fi

    if [ ! "$TDMA_SLAVES" = "" ]; then
	# Simple setup:
	#   Sync / Master Slot / + TDMA_OFFSET us / Slave 1 /
	#   + TDMA_OFFSET us / Slave 2 / + TDMA_OFFSET us / ... / Slave n

	$RTIFCONFIG rteth0 up $IPADDR $NETMASK_OPT

	$TDMACFG rteth0 master $TDMA_CYCLE
	$TDMACFG rteth0 slot 0 0

	OFFSET=$TDMA_OFFSET
	for SLAVE in $TDMA_SLAVES; do
	    echo "\$TDMACFG rteth0 slot 0 $OFFSET;ifconfig vnic0 up \$IPADDR \$NETMASK_OPT" | \
		$RTCFG rteth0 add $SLAVE -stage1 - $STAGE_2_OPT
	    OFFSET=$(($OFFSET+$TDMA_OFFSET))
	done
    else
	# Get setup from TDMA_CONFIG file:
	#
	# master:
	# [ip 1.2.3.4]
	# cycle <cycle_in_us>
	# slot <id> <offset_in_us> [<phasing>/<period> [<size> [<joint_slot_id>]]]
	# slot ...
	#
	# slave:
	# ip 1.2.3.4
	# mac AA:BB:CC:DD:EE:FF
	# [stage2 <file>]
	# slot ...
	#
	# slave:
	# ip 1.2.3.4
	# [stage2 <file>]
	# slot ...
	#
	# slave:
	# mac AA:BB:CC:DD:EE:FF
	# [stage2 <file>]
	# slot ...
	#
	# backup-master:
	# ip 1.2.3.4    (or ip+mac or mac only, just like slaves)
	# backup-slot <offset_in_us>
	# [stage2 <file>]
	# slot ...
	#

	if [ ! -r $TDMA_CONFIG ]; then
	    echo "Could not read $TDMA_CONFIG"
	    exit 1
	fi

	while read ARG1 ARG2 ARG3 ARG4 ARG5 ARG6; do
	    case "$ARG1" in
		"master:")
		    submit_cfg
		    STATION_TYPE=master
		    ;;
		"cycle")
		    TDMA_CYCLE="$ARG2"
		    ;;
		"backup-master:")
		    submit_cfg
		    STATION_TYPE=backup-master
		    ;;
		"backup-offset")
		    TDMA_BACKUP_OFFS="$ARG2"
		    ;;
		"slave:")
		    submit_cfg
		    STATION_TYPE=slave
		    ;;
		"ip")
		    STATION_IP="$ARG2"
		    ;;
		"mac")
		    STATION_MAC="$ARG2"
		    ;;
		"stage2")
		    STATION_STAGE_2="$ARG2"
		    ;;
		"slot")
		    TDMA_SLOTS="$TDMA_SLOTS\$TDMACFG rteth0 slot $ARG2 $ARG3"
		    if [ ! "$ARG4" = "" ]; then
			TDMA_SLOTS="$TDMA_SLOTS -p $ARG4"
		    fi
		    if [ ! "$ARG5" = "" ]; then
			TDMA_SLOTS="$TDMA_SLOTS -s $ARG5"
		    fi
		    if [ ! "$ARG6" = "" ]; then
			TDMA_SLOTS="$TDMA_SLOTS -j $ARG6"
		    fi
		    TDMA_SLOTS="$TDMA_SLOTS;"
		    ;;
	    esac
	done < $TDMA_CONFIG
	submit_cfg
    fi

    ifconfig vnic0 up $IPADDR $NETMASK_OPT

    echo -n "Waiting for all slaves..."
    $RTCFG rteth0 wait
    $RTCFG rteth0 ready
    echo
}


if [ "$1" = "-cf" ]; then
    RTNETCFG="$2"
    shift 2
fi

if [ -r $RTNETCFG ]; then
    . $RTNETCFG
else
    echo "Could not read $RTNETCFG"
    exit 1
fi

if [ "$1" = "-v" ]; then
    echo "Turning on verbose mode"
    RTIFCONFIG="debug_func $RTIFCONFIG"
    RTCFG="debug_func $RTCFG"
    TDMACFG="debug_func $TDMACFG"
    shift 1
fi

if [ "$1" = "-c" ]; then
    RTCAP="yes"
    shift 1
fi

NETMASK_OPT=
if [ ! "$NETMASK" = "" ]; then
    NETMASK_OPT="netmask $NETMASK"
fi


case "$1" in
    start)
	init_rtnet

	if [ $TDMA_MODE = "master" ]; then
	    start_master
	else
	    $TDMACFG rteth0 slave

	    $RTIFCONFIG rteth0 up $IPADDR $NETMASK_OPT

	    echo -n "Stage 1: searching for master..."
	    eval "`$RTCFG rteth0 client -c`"
	    echo

	    echo -n "Stage 2: waiting for other slaves..."
	    if [ ! "$STAGE_2_DST" = "" ]; then
		$RTCFG rteth0 announce -f $STAGE_2_DST
		echo
		eval "$STAGE_2_CMDS"
	    else
		$RTCFG rteth0 announce
		echo
	    fi

	    echo -n "Stage 3: waiting for common setup completion..."
	    $RTCFG rteth0 ready
	    echo
	fi
	;;

    stop)
	ifconfig vnic0 down 2>/dev/null
	ifconfig rteth0 down 2>/dev/null
	ifconfig rteth0-mac down 2>/dev/null
	ifconfig rtlo down 2>/dev/null

	$RTIFCONFIG rteth0 down 2>/dev/null
	$RTIFCONFIG rtlo down 2>/dev/null

	rmmod tdma rtmac rtcfg rtcap rt_loopback $RT_DRIVER rtpacket rtudp rttcp rtipv4 rtnet 2>/dev/null

	for dev in $REBIND_RT_NICS; do
	    echo 1 > /sys/bus/pci/devices/$dev/remove
	done
	if [ ! "$REBIND_RT_NICS" = "" ]; then
	    sleep 1
	    echo 1 > /sys/bus/pci/rescan
	fi
	;;

    master)
	shift
	init_rtnet
	TDMA_SLAVES=$*
	start_master
	;;

    capture)
	modprobe rtnet >/dev/null || exit 1
	modprobe $RT_DRIVER $RT_DRIVER_OPTIONS >/dev/null || exit 1
	modprobe rtcap >/dev/null || exit 1
	$RTIFCONFIG rteth0 up promisc
	ifconfig rteth0 up
	ifconfig rteth0-mac up
	;;

    loopback)
	modprobe rtnet >/dev/null || exit 1
	modprobe rtipv4 >/dev/null || exit 1

	for PROTOCOL in $RT_PROTOCOLS; do
	    modprobe rt$PROTOCOL >/dev/null || exit 1
	done

	modprobe rt_loopback >/dev/null || exit 1

	if [ $RTCAP = "yes" ]; then
	    modprobe rtcap >/dev/null || exit 1
	fi

	$RTIFCONFIG rtlo up 127.0.0.1

	if [ $RTCAP = "yes" ]; then
	    ifconfig rtlo up
	fi
	;;

    *)
	usage
	exit 1
esac