selftests: net: move wait_local_port_listen to lib.sh

The function wait_local_port_listen() is the only function defined in
net_helper.sh. Since some tests source both lib.sh and net_helper.sh,
we can simplify the setup by moving wait_local_port_listen() to lib.sh.

With this change, net_helper.sh becomes redundant and can be removed.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20250526014600.9128-1-liuhangbin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: liuhangbin

tools/testing/selftests/drivers/net/Makefile

@@ -3,7 +3,6 @@ CFLAGS += $(KHDR_INCLUDES)
 
 TEST_INCLUDES := $(wildcard lib/py/*.py) \
 		 $(wildcard lib/sh/*.sh) \
-		 ../../net/net_helper.sh \
 		 ../../net/lib.sh \
 
 TEST_GEN_FILES := \

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

@@ -33,7 +33,6 @@ NSIM_DEV_SYS_NEW="/sys/bus/netdevsim/new_device"
 
 # Used to create and delete namespaces
 source "${LIBDIR}"/../../../../net/lib.sh
-source "${LIBDIR}"/../../../../net/net_helper.sh
 
 # Create netdevsim interfaces
 create_ifaces() {

tools/testing/selftests/drivers/net/netdevsim/peer.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0-only
 
-source ../../../net/net_helper.sh
+source ../../../net/lib.sh
 
 NSIM_DEV_1_ID=$((256 + RANDOM % 256))
 NSIM_DEV_1_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_DEV_1_ID

tools/testing/selftests/net/Makefile

@@ -115,7 +115,7 @@ YNL_GEN_FILES := busy_poller netlink-dumps
 TEST_GEN_FILES += $(YNL_GEN_FILES)
 
 TEST_FILES := settings
-TEST_FILES += in_netns.sh lib.sh net_helper.sh setup_loopback.sh setup_veth.sh
+TEST_FILES += in_netns.sh lib.sh setup_loopback.sh setup_veth.sh
 
 TEST_GEN_FILES += $(patsubst %.c,%.o,$(wildcard *.bpf.c))
 

tools/testing/selftests/net/busy_poll_test.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 # SPDX-License-Identifier: GPL-2.0
-source net_helper.sh
+source lib.sh
 
 NSIM_SV_ID=$((256 + RANDOM % 256))
 NSIM_SV_SYS=/sys/bus/netdevsim/devices/netdevsim$NSIM_SV_ID

tools/testing/selftests/net/ipv6_route_update_soft_lockup.sh

@@ -69,7 +69,6 @@
 # which can affect the conditions needed to trigger a soft lockup.
 
 source lib.sh
-source net_helper.sh
 
 TEST_DURATION=300
 ROUTING_TABLE_REFRESH_PERIOD=0.01

tools/testing/selftests/net/lib.sh

@@ -595,3 +595,24 @@ bridge_vlan_add()
 	bridge vlan add "$@"
 	defer bridge vlan del "$@"
 }
+
+wait_local_port_listen()
+{
+	local listener_ns="${1}"
+	local port="${2}"
+	local protocol="${3}"
+	local pattern
+	local i
+
+	pattern=":$(printf "%04X" "${port}") "
+
+	# for tcp protocol additionally check the socket state
+	[ ${protocol} = "tcp" ] && pattern="${pattern}0A"
+	for i in $(seq 10); do
+		if ip netns exec "${listener_ns}" awk '{print $2" "$4}' \
+		   /proc/net/"${protocol}"* | grep -q "${pattern}"; then
+			break
+		fi
+		sleep 0.1
+	done
+}

tools/testing/selftests/net/mptcp/Makefile

@@ -11,7 +11,7 @@ TEST_GEN_FILES = mptcp_connect pm_nl_ctl mptcp_sockopt mptcp_inq mptcp_diag
 
 TEST_FILES := mptcp_lib.sh settings
 
-TEST_INCLUDES := ../lib.sh $(wildcard ../lib/sh/*.sh) ../net_helper.sh
+TEST_INCLUDES := ../lib.sh $(wildcard ../lib/sh/*.sh)
 
 EXTRA_CLEAN := *.pcap
 

tools/testing/selftests/net/mptcp/mptcp_lib.sh

@@ -2,7 +2,6 @@
 # SPDX-License-Identifier: GPL-2.0
 
 . "$(dirname "${0}")/../lib.sh"
-. "$(dirname "${0}")/../net_helper.sh"
 
 readonly KSFT_PASS=0
 readonly KSFT_FAIL=1