scripts/gen_nvme.sh: add option for remote bdev JSON configuration

Add "create_remote_json_config" which will create
a bdev JSON configuration for SPDK initiator to
connect to NVMe-oF Target.

Change-Id: I2370c6911df35ffa1f27e93bdfa4ddb7f174ea49
Signed-off-by: Karol Latecki <karol.latecki@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/8776
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Paul Luse <paul.e.luse@intel.com>
Reviewed-by: GangCao <gang.cao@intel.com>
Reviewed-by: Maciej Wawryk <maciejx.wawryk@intel.com>

scripts/gen_nvme.sh

@@ -6,6 +6,9 @@ rootdir=$(readlink -f $(dirname $0))/..
 source "$rootdir/scripts/common.sh"
 
 gen_subsystems=false
+gen_mode="local"
+gen_function="create_local_json_config"
+gen_args=()
 
 function usage() {
 	echo "Script for generating JSON configuration file for attaching"
@@ -13,11 +16,16 @@ function usage() {
 	echo "Usage: ${0##*/} [OPTIONS]"
 	echo
 	echo "-h, --help                     Print help and exit"
+	echo "    --mode                     Generate 'local' or 'remote' NVMe JSON configuration. Default is 'local'."
+	echo "                               Remote needs --trid option to be present."
+	echo "    --trid                     Comma separated list target subsystem information containing transport type,"
+	echo "                               IP addresses, port numbers and NQN names."
+	echo "                               Example: tcp:127.0.0.1:4420:nqn.2016-06.io.spdk:cnode1,tcp:127.0.0.1:4421:nqn.2016-06.io.spdk:cnode2"
 	echo "    --json-with-subsystems     Wrap bdev subsystem JSON configuration with higher level 'subsystems' dictionary."
 	exit 0
 }
 
-function create_json_config() {
+function create_local_json_config() {
 	local bdev_json_cfg=()
 	local bdfs=()
 
@@ -49,11 +57,56 @@ function create_json_config() {
 	JSON
 }
 
+function create_remote_json_config() {
+	local trids
+	local bdev_json_cfg=()
+
+	IFS="," read -r -a trids <<< $1
+	for ((i = 0; i < ${#trids[@]}; i++)); do
+		local transport
+		local ip_addr
+		local svc_port
+		local nqn
+
+		IFS=":" read -r transport ip_addr svc_port nqn <<< ${trids[i]}
+		bdev_json_cfg+=("$(
+			cat <<- JSON
+				{
+					"method": "bdev_nvme_attach_controller",
+					"params": {
+						"trtype": "$transport",
+						"adrfam": "IPv4",
+						"name": "Nvme${i}",
+						"subnqn": "$nqn",
+						"traddr": "$ip_addr",
+						"trsvcid": "$svc_port"
+					}
+				}
+			JSON
+		)")
+	done
+
+	local IFS=","
+	cat <<- JSON
+		{
+			"subsystem": "bdev",
+			"config": [
+				${bdev_json_cfg[*]}
+			]
+		}
+	JSON
+}
+
 while getopts 'h-:' optchar; do
 	case "$optchar" in
 		-)
 			case "$OPTARG" in
 				help) usage ;;
+				mode=*)
+					gen_mode="${OPTARG#*=}"
+					gen_function="create_${OPTARG#*=}_json_config"
+					;;
+				trid=*) remote_trid="${OPTARG#*=}" ;;
 				json-with-subsystems) gen_subsystems=true ;;
 				*) echo "Invalid argument '$OPTARG'" && usage ;;
 			esac
@@ -63,7 +116,16 @@ while getopts 'h-:' optchar; do
 	esac
 done
 
-bdev_json_cfg=$(create_json_config)
+if [[ "$gen_mode" == "remote" ]] && [[ -z "$remote_trid" ]]; then
+	echo "For $gen_mode --trid argument must be provided."
+	exit 1
+fi
+
+if [[ "$gen_mode" == "remote" ]]; then
+	gen_args+=("$remote_trid")
+fi
+
+bdev_json_cfg=$("$gen_function" "${gen_args[@]}")
 if [[ $gen_subsystems == true ]]; then
 	bdev_json_cfg=$(
 		cat <<- JSON