[PATCH net 13/14] selftests: mptcp: userspace pm: skip if not supported

[Matthieu Baerts]

Selftests are supposed to run on any kernels, including the old ones not
supporting all MPTCP features.

One of them is the MPTCP Userspace PM introduced by commit 4638de5aefe5
("mptcp: handle local addrs announced by userspace PMs").

We can skip all these tests if the feature is not supported simply by
looking for the MPTCP pm_type's sysctl knob.

Link: https://github.com/multipath-tcp/mptcp_net-next/issues/368
Fixes: 259a834fadda ("selftests: mptcp: functional tests for the userspace PM type")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Matthieu Baerts <matthieu.baerts@xxxxxxxxxxxx>
---
 tools/testing/selftests/net/mptcp/userspace_pm.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/net/mptcp/userspace_pm.sh b/tools/testing/selftests/net/mptcp/userspace_pm.sh
index 192ab818f292..38a1d34f7b4d 100755
--- a/tools/testing/selftests/net/mptcp/userspace_pm.sh
+++ b/tools/testing/selftests/net/mptcp/userspace_pm.sh
@@ -5,6 +5,11 @@
 
 mptcp_lib_check_mptcp
 
+if ! mptcp_lib_has_file '/proc/sys/net/mptcp/pm_type'; then
+	echo "userspace pm tests are not supported by the kernel: SKIP"
+	exit ${KSFT_SKIP}
+fi
+
 ip -Version > /dev/null 2>&1
 if [ $? -ne 0 ];then
 	echo "SKIP: Cannot not run test without ip tool"

-- 
2.40.1