# Network configuration
TARGET_INTERFACE="spdk_tgt_int"
INITIATOR_INTERFACE="spdk_init_int"
TARGET_NAMESPACE="spdk_iscsi_ns"
TARGET_NS_CMD=(ip netns exec "$TARGET_NAMESPACE")

# iSCSI target configuration
TARGET_IP=10.0.0.1
INITIATOR_IP=10.0.0.2
ISCSI_PORT=3260
NETMASK=$INITIATOR_IP/32
INITIATOR_TAG=2
INITIATOR_NAME=ANY
PORTAL_TAG=1
ISCSI_APP=("${TARGET_NS_CMD[@]}" "${ISCSI_APP[@]}")
if [ $SPDK_TEST_VPP -eq 1 ]; then
	ISCSI_APP+=(-L sock_vpp)
fi
ISCSI_TEST_CORE_MASK=0xFF

function create_veth_interfaces() {
	# $1 = test type (posix/vpp)
	ip netns del $TARGET_NAMESPACE || true
	ip link delete $INITIATOR_INTERFACE || true

	trap 'cleanup_veth_interfaces $1; exit 1' SIGINT SIGTERM EXIT

	# Create veth (Virtual ethernet) interface pair
	ip link add $INITIATOR_INTERFACE type veth peer name $TARGET_INTERFACE
	ip addr add $INITIATOR_IP/24 dev $INITIATOR_INTERFACE
	ip link set $INITIATOR_INTERFACE up

	# Create and add interface for target to network namespace
	ip netns add $TARGET_NAMESPACE
	ip link set $TARGET_INTERFACE netns $TARGET_NAMESPACE

	# Accept connections from veth interface
	iptables -I INPUT 1 -i $INITIATOR_INTERFACE -p tcp --dport $ISCSI_PORT -j ACCEPT

	"${TARGET_NS_CMD[@]}" ip link set $TARGET_INTERFACE up

	if [ "$1" == "posix" ]; then
		"${TARGET_NS_CMD[@]}" ip link set lo up
		"${TARGET_NS_CMD[@]}" ip addr add $TARGET_IP/24 dev $TARGET_INTERFACE

		# Verify connectivity
		ping -c 1 $TARGET_IP
		ip netns exec $TARGET_NAMESPACE ping -c 1 $INITIATOR_IP
	else
		start_vpp
	fi
}

function cleanup_veth_interfaces() {
	# $1 = test type (posix/vpp)
	if [ "$1" == "vpp" ]; then
		kill_vpp
	fi

	# Cleanup veth interfaces and network namespace
	# Note: removing one veth, removes the pair
	ip link delete $INITIATOR_INTERFACE
	ip netns del $TARGET_NAMESPACE
}

function iscsitestinit() {
	if [ "$1" == "iso" ]; then
		$rootdir/scripts/setup.sh
		if [ -n "$2" ]; then
			create_veth_interfaces $2
		else
			# default to posix
			create_veth_interfaces "posix"
		fi
	fi
}

function waitforiscsidevices() {
	local num=$1

	for ((i = 1; i <= 20; i++)); do
		n=$(iscsiadm -m session -P 3 | grep -c "Attached scsi disk sd[a-z]*" || true)
		if [ $n -ne $num ]; then
			sleep 0.1
		else
			return 0
		fi
	done

	return 1
}

function iscsitestfini() {
	if [ "$1" == "iso" ]; then
		if [ -n "$2" ]; then
			cleanup_veth_interfaces $2
		else
			# default to posix
			cleanup_veth_interfaces "posix"
		fi
		$rootdir/scripts/setup.sh reset
	fi
}

function start_vpp() {
	# We need to make sure that posix side doesn't send jumbo packets while
	# for VPP side maximal size of MTU for TCP is 1460 and tests doesn't work
	# stable with larger packets
	MTU=1460
	MTU_W_HEADER=$((MTU + 20))
	ip link set dev $INITIATOR_INTERFACE mtu $MTU
	ethtool -K $INITIATOR_INTERFACE tso off
	ethtool -k $INITIATOR_INTERFACE

	# Start VPP process in SPDK target network namespace
	"${TARGET_NS_CMD[@]}" vpp \
		unix { nodaemon cli-listen /run/vpp/cli.sock } \
		dpdk { no-pci } \
		session { evt_qs_memfd_seg } \
		socksvr { socket-name /run/vpp-api.sock } \
		plugins { \
		plugin default { disable } \
		plugin dpdk_plugin.so { enable } \
		} &

	vpp_pid=$!
	echo "VPP Process pid: $vpp_pid"

	gdb_attach $vpp_pid &

	# Wait until VPP starts responding
	xtrace_disable
	counter=40
	while [ $counter -gt 0 ]; do
		vppctl show version | grep -E "vpp v[0-9]+\.[0-9]+" && break
		counter=$((counter - 1))
		sleep 0.5
	done
	xtrace_restore
	if [ $counter -eq 0 ]; then
		return 1
	fi

	# Below VPP commands are masked with "|| true" for the sake of
	# running the test in the CI system. For reasons unknown when
	# run via CI these commands result in 141 return code (pipefail)
	# even despite producing valid output.
	# Using "|| true" does not impact the "-e" flag used in test scripts
	# because vppctl cli commands always return with 0, even if
	# there was an error.
	# As a result - grep checks on command outputs must be used to
	# verify vpp configuration and connectivity.

	# Setup host interface
	vppctl create host-interface name $TARGET_INTERFACE || true
	VPP_TGT_INT="host-$TARGET_INTERFACE"
	vppctl set interface state $VPP_TGT_INT up || true
	vppctl set interface ip address $VPP_TGT_INT $TARGET_IP/24 || true
	vppctl set interface mtu $MTU $VPP_TGT_INT || true

	vppctl show interface | tr -s " " | grep -E "host-$TARGET_INTERFACE [0-9]+ up $MTU/0/0/0"

	# Disable session layer
	# NOTE: VPP net framework should enable it itself.
	vppctl session disable || true

	# Verify connectivity
	vppctl show int addr | grep -E "$TARGET_IP/24"
	ip addr show $INITIATOR_INTERFACE
	ip netns exec $TARGET_NAMESPACE ip addr show $TARGET_INTERFACE
	sleep 3
	# SC1010: ping -M do - in this case do is an option not bash special word
	# shellcheck disable=SC1010
	ping -c 1 $TARGET_IP -s $((MTU - 28)) -M do
	vppctl ping $INITIATOR_IP repeat 1 size $((MTU - (28 + 8))) verbose | grep -E "$MTU_W_HEADER bytes from $INITIATOR_IP"
}

function kill_vpp() {
	vppctl delete host-interface name $TARGET_INTERFACE || true

	# Dump VPP configuration before kill
	vppctl show api clients || true
	vppctl show session || true
	vppctl show errors || true

	killprocess $vpp_pid
}
function initiator_json_config() {
	# Prepare config file for iSCSI initiator
	jq . <<- JSON
		{
		  "subsystems": [
		    {
		      "subsystem": "bdev",
		      "config": [
		        {
		          "method": "bdev_iscsi_create",
		          "params": {
		            "name": "iSCSI0",
		            "url": "iscsi://$TARGET_IP/iqn.2016-06.io.spdk:disk1/0",
		            "initiator_iqn": "iqn.2016-06.io.spdk:disk1/0"
		          }
		        }${*:+,$*}
		      ]
		    }
		  ]
		}
	JSON
}