zfcp_host_configure

#!/bin/sh
#
# zfcp_host_configure
#
# Configures a zfcp host adapter
#
# Usage:
#   zfcp_host_configure <ccwid> <online>
#
#	ccwid = x.y.ssss where
#		x is always 0 until IBM creates something that uses that number
#		y is the logical channel subsystem (lcss) number. Most often this is 0, but it could be non-zero
#		ssss is the four digit subchannel address of the device, in hexidecimal, with leading zeros.
#	online = 0 to take the device offline
#		 1 to bring the device online
#
# Return codes
#   1  sysfs not mounted
#   2  invalid value for <online>
#   3  device <ccwid> does not exist
#   4  module zfcp could not be loaded
#   5  adapter status could not be changed
#   6  wwpn ports still active
#  10  adapter active but allow_lun_scan active
#

if [ "${DEBUG}" != "yes" ]; then
  DEBUG="no"
fi

DATUM=$(date)

add_channel_for_cio() {
	echo "$* # $DATUM" >> /boot/zipl/active_devices.txt
}

remove_channel_for_cio() {
	[ -w /boot/zipl/active_devices.txt ] && sed -i -e "/^$1/d" /boot/zipl/active_devices.txt
}

mesg () {
    echo "$@"
}

exit_on_err() {
	if [ "$2" == "online" ] || [ "$2" == "offline" ]; then
	    _state="5"
	fi
	case "$1" in
      0) return 0 ;;
	    *) exit $_state ;;
	esac
}

debug_mesg () {
    case "$DEBUG" in
        yes) mesg "$@" ;;
        *) ;;
    esac
}

if [ $# -ne 2 ] ; then
    echo "Usage: $0  <ccwid> <online>"
    echo "	ccwid = x.y.ssss where"
    echo "		x is always 0 until IBM creates something that uses that number"
    echo "		y is the logical channel subsystem (lcss) number. Most often this is 0, but it could be non-zero"
    echo "		ssss is the four digit subchannel address of the device, in hexidecimal, with leading zeros."
    echo "	online = 0 to take the device offline"
    echo "		 1 to bring the device online"
    exit 1
fi

#Throw error if SYSFS is not present
grep -qe ^'sysfs /sys' < /proc/mounts
if [ $? -ne 0 ]; then
    mesg "/sysfs not present"
    exit 1
fi

#initial variables
CCW_CHAN_ID=$1
ONLINE=$2
MODULE=zfcp
ALREADY_ONLINE=0

if [ -z "$CCW_CHAN_ID" ] ; then
    mesg "No CCW device specified"
    exit 1
fi

if [ -z "$ONLINE" ] || [ "$ONLINE" != "1" -a "$ONLINE" != "0" ]; then
    mesg "Invalid device status $ONLINE"
    exit 2
fi

_ccw_dir=/sys/bus/ccw/devices
_zfcp_dir="$_ccw_dir/$CCW_CHAN_ID"

if test ! -d "$_zfcp_dir" ; then #to be replaced
    mesg "No device ${CCW_CHAN_ID}"
    exit 3
fi

# Check whether we need to do something
_zfcp_dev_status=$(lszdev ${CCW_CHAN_ID} -i | grep online | grep -o '[0-9]*' | head -1)
if [ "$_zfcp_dev_status" -eq "$ONLINE" ]; then
    debug_mesg "zFCP adapter ${CCW_CHAN_ID} already in status ${ONLINE}"
    ALREADY_ONLINE=1
fi

debug_mesg "Configuring device ${CCW_CHAN_ID}"

if [ "$ONLINE" -eq "1" ]; then
    if [ "${ALREADY_ONLINE}" -eq "0" ]; then
	# Activate the device
	chzdev --enable zfcp-host ${CCW_CHAN_ID}

	# Now wait for the adapter to initialize
	/sbin/udevadm settle
    fi

    for loop in 1 2 3 4 5 ; do
	read status < /sys/bus/ccw/devices/$CCW_CHAN_ID/status #to be replaced
	(( $status & 0x10000000 )) && break;
    done
    read wwpn_status < /sys/bus/ccw/devices/$CCW_CHAN_ID/status #to be replaced
    if !(( $wwpn_status & 0x10000000 )) ; then
	chzdev --disable zfcp-host ${CCW_CHAN_ID}
	mesg "Could not activate adapter, status $wwpn_status"
	exit 5
    fi

    add_channel_for_cio "${CCW_CHAN_ID}"
    # Check whether we need to do something
    read allow_lun_scan < /sys/module/zfcp/parameters/allow_lun_scan #to be replaced
    if [ "$allow_lun_scan" = "Y" ] ; then
	for host in ${_zfcp_dir}/host* ; do
	    [ -d $host ] || continue
	    hba_num=${host##*host}
	done
	# Automatic LUN scan is only possible on NPIV ports
	read port_type < /sys/class/fc_host/host${hba_num}/port_type #to be replaced
	if [ "$port_type" = "NPIV VPORT" ] ; then
	    exit 10;
	fi
    fi
else
    chzdev --disable zfcp-host ${CCW_CHAN_ID}
    # Re-read to check whether we have succeeded
    _zfcp_dev_status=$(lszdev ${CCW_CHAN_ID} -i | grep online | grep -o '[0-9]*' | head -1)
    if [ "$_ccw_dev_status" -ne "$ONLINE" ]; then
	mesg "Could not change status of device ${CCW_CHAN_ID} to $ONLINE"
	exit 5
    fi
    echo "${CCW_CHAN_ID}" > /sys/bus/ccw/drivers/zfcp/unbind #to be replaced
    echo "${CCW_CHAN_ID}" > /sys/bus/ccw/drivers/zfcp/bind #to be replaced
    remove_channel_for_cio "${CCW_CHAN_ID}"

    debug_mesg "zFCP adapter at ${CCW_CHAN_ID} deactivated"
fi

exit 0