diff --git a/tools/testing/selftests/net/mptcp/diag.sh b/tools/testing/selftests/net/mptcp/diag.sh
index 7f89623f1080..f00c97b2a6b5 100755
--- a/tools/testing/selftests/net/mptcp/diag.sh
+++ b/tools/testing/selftests/net/mptcp/diag.sh
@@ -186,23 +186,6 @@ chk_msk_inuse()
 	__chk_nr get_msk_inuse $expected "${msg}" 0
 }
 
-# $1: ns, $2: port
-wait_local_port_listen()
-{
-	local listener_ns="${1}"
-	local port="${2}"
-
-	local port_hex i
-
-	port_hex="$(printf "%04X" "${port}")"
-	for i in $(seq 10); do
-		ip netns exec "${listener_ns}" cat /proc/net/tcp | \
-			awk "BEGIN {rc=1} {if (\$2 ~ /:${port_hex}\$/ && \$4 ~ /0A/) {rc=0; exit}} END {exit rc}" &&
-			break
-		sleep 0.1
-	done
-}
-
 # $1: cestab nr
 chk_msk_cestab()
 {
@@ -240,7 +223,7 @@ echo "a" | \
 		ip netns exec $ns \
 			./mptcp_connect -p 10000 -l -t ${timeout_poll} -w 20 \
 				0.0.0.0 >/dev/null &
-wait_local_port_listen $ns 10000
+mptcp_lib_wait_local_port_listen $ns 10000
 chk_msk_nr 0 "no msk on netns creation"
 chk_msk_listen 10000
 
@@ -265,7 +248,7 @@ echo "a" | \
 		ip netns exec $ns \
 			./mptcp_connect -p 10001 -l -s TCP -t ${timeout_poll} -w 20 \
 				0.0.0.0 >/dev/null &
-wait_local_port_listen $ns 10001
+mptcp_lib_wait_local_port_listen $ns 10001
 echo "b" | \
 	timeout ${timeout_test} \
 		ip netns exec $ns \
@@ -288,7 +271,7 @@ for I in `seq 1 $NR_CLIENTS`; do
 				./mptcp_connect -p $((I+10001)) -l -w 20 \
 					-t ${timeout_poll} 0.0.0.0 >/dev/null &
 done
-wait_local_port_listen $ns $((NR_CLIENTS + 10001))
+mptcp_lib_wait_local_port_listen $ns $((NR_CLIENTS + 10001))
 
 for I in `seq 1 $NR_CLIENTS`; do
 	echo "b" | \
diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.sh b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
index d203d314b7b2..3763ffa214d5 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
@@ -342,23 +342,6 @@ do_ping()
 	return 0
 }
 
-# $1: ns, $2: port
-wait_local_port_listen()
-{
-	local listener_ns="${1}"
-	local port="${2}"
-
-	local port_hex i
-
-	port_hex="$(printf "%04X" "${port}")"
-	for i in $(seq 10); do
-		ip netns exec "${listener_ns}" cat /proc/net/tcp* | \
-			awk "BEGIN {rc=1} {if (\$2 ~ /:${port_hex}\$/ && \$4 ~ /0A/) {rc=0; exit}} END {exit rc}" &&
-			break
-		sleep 0.1
-	done
-}
-
 do_transfer()
 {
 	local listener_ns="$1"
@@ -448,7 +431,7 @@ do_transfer()
 				$extra_args $local_addr < "$sin" > "$sout" &
 	local spid=$!
 
-	wait_local_port_listen "${listener_ns}" "${port}"
+	mptcp_lib_wait_local_port_listen "${listener_ns}" "${port}"
 
 	local start
 	start=$(date +%s%3N)
diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 497dc187387f..442b7220468a 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -598,24 +598,6 @@ link_failure()
 	done
 }
 
-# $1: ns, $2: port
-wait_local_port_listen()
-{
-	local listener_ns="${1}"
-	local port="${2}"
-
-	local port_hex
-	port_hex="$(printf "%04X" "${port}")"
-
-	local i
-	for i in $(seq 10); do
-		ip netns exec "${listener_ns}" cat /proc/net/tcp* | \
-			awk "BEGIN {rc=1} {if (\$2 ~ /:${port_hex}\$/ && \$4 ~ /0A/) {rc=0; exit}} END {exit rc}" &&
-			break
-		sleep 0.1
-	done
-}
-
 rm_addr_count()
 {
 	mptcp_lib_get_counter "${1}" "MPTcpExtRmAddr"
@@ -1117,7 +1099,7 @@ do_transfer()
 	fi
 	local spid=$!
 
-	wait_local_port_listen "${listener_ns}" "${port}"
+	mptcp_lib_wait_local_port_listen "${listener_ns}" "${port}"
 
 	extra_cl_args="$extra_args $extra_cl_args"
 	if [ "$test_linkfail" -eq 0 ];then
diff --git a/tools/testing/selftests/net/mptcp/mptcp_lib.sh b/tools/testing/selftests/net/mptcp/mptcp_lib.sh
index d98c89f31afe..919f4f1018eb 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_lib.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_lib.sh
@@ -274,3 +274,21 @@ mptcp_lib_events() {
 	ip netns exec "${ns}" ./pm_nl_ctl events >> "${evts}" 2>&1 &
 	pid=$!
 }
+
+# $1: ns, $2: port
+mptcp_lib_wait_local_port_listen() {
+	local listener_ns="${1}"
+	local port="${2}"
+
+	local port_hex
+	port_hex="$(printf "%04X" "${port}")"
+
+	local _
+	for _ in $(seq 10); do
+		ip netns exec "${listener_ns}" cat /proc/net/tcp* | \
+			awk "BEGIN {rc=1} {if (\$2 ~ /:${port_hex}\$/ && \$4 ~ /0A/) \
+			     {rc=0; exit}} END {exit rc}" &&
+			break
+		sleep 0.1
+	done
+}
diff --git a/tools/testing/selftests/net/mptcp/simult_flows.sh b/tools/testing/selftests/net/mptcp/simult_flows.sh
index f24bd2bf0831..214a89fce8b8 100755
--- a/tools/testing/selftests/net/mptcp/simult_flows.sh
+++ b/tools/testing/selftests/net/mptcp/simult_flows.sh
@@ -123,23 +123,6 @@ setup()
 	grep -q ' kmemleak_init$\| lockdep_init$\| kasan_init$\| prove_locking$' /proc/kallsyms && slack=$((slack+550))
 }
 
-# $1: ns, $2: port
-wait_local_port_listen()
-{
-	local listener_ns="${1}"
-	local port="${2}"
-
-	local port_hex i
-
-	port_hex="$(printf "%04X" "${port}")"
-	for i in $(seq 10); do
-		ip netns exec "${listener_ns}" cat /proc/net/tcp* | \
-			awk "BEGIN {rc=1} {if (\$2 ~ /:${port_hex}\$/ && \$4 ~ /0A/) {rc=0; exit}} END {exit rc}" &&
-			break
-		sleep 0.1
-	done
-}
-
 do_transfer()
 {
 	local cin=$1
@@ -179,7 +162,7 @@ do_transfer()
 				0.0.0.0 < "$sin" > "$sout" &
 	local spid=$!
 
-	wait_local_port_listen "${ns3}" "${port}"
+	mptcp_lib_wait_local_port_listen "${ns3}" "${port}"
 
 	timeout ${timeout_test} \
 		ip netns exec ${ns1} \