selftest: netcons: refactor target creation

Extract the netconsole target creation from create_dynamic_target(), by
moving it from create_dynamic_target() into a new helper function. This
enables other tests to use the creation of netconsole targets with
arbitrary parameters and no sleep.

The new helper will be utilized by forthcoming torture-type selftests
that require dynamic target management.

Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20251107-netconsole_torture-v10-2-749227b55f63@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: leitao

tools/testing/selftests/drivers/net/lib/sh/lib_netcons.sh

@@ -113,31 +113,39 @@ function set_network() {
 	configure_ip
 }
 
-function create_dynamic_target() {
-	local FORMAT=${1:-"extended"}
+function _create_dynamic_target() {
+	local FORMAT="${1:?FORMAT parameter required}"
+	local NCPATH="${2:?NCPATH parameter required}"
 
 	DSTMAC=$(ip netns exec "${NAMESPACE}" \
 		 ip link show "${DSTIF}" | awk '/ether/ {print $2}')
 
 	# Create a dynamic target
-	mkdir "${NETCONS_PATH}"
+	mkdir "${NCPATH}"
 
-	echo "${DSTIP}" > "${NETCONS_PATH}"/remote_ip
-	echo "${SRCIP}" > "${NETCONS_PATH}"/local_ip
-	echo "${DSTMAC}" > "${NETCONS_PATH}"/remote_mac
-	echo "${SRCIF}" > "${NETCONS_PATH}"/dev_name
+	echo "${DSTIP}" > "${NCPATH}"/remote_ip
+	echo "${SRCIP}" > "${NCPATH}"/local_ip
+	echo "${DSTMAC}" > "${NCPATH}"/remote_mac
+	echo "${SRCIF}" > "${NCPATH}"/dev_name
 
 	if [ "${FORMAT}" == "basic" ]
 	then
 		# Basic target does not support release
-		echo 0 > "${NETCONS_PATH}"/release
-		echo 0 > "${NETCONS_PATH}"/extended
+		echo 0 > "${NCPATH}"/release
+		echo 0 > "${NCPATH}"/extended
 	elif [ "${FORMAT}" == "extended" ]
 	then
-		echo 1 > "${NETCONS_PATH}"/extended
+		echo 1 > "${NCPATH}"/extended
 	fi
 
-	echo 1 > "${NETCONS_PATH}"/enabled
+	echo 1 > "${NCPATH}"/enabled
+
+}
+
+function create_dynamic_target() {
+	local FORMAT=${1:-"extended"}
+	local NCPATH=${2:-"$NETCONS_PATH"}
+	_create_dynamic_target "${FORMAT}" "${NCPATH}"
 
 	# This will make sure that the kernel was able to
 	# load the netconsole driver configuration. The console message