selftests: mptcp: diag: skip inuse tests if not supported

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

One of them is the reporting of the MPTCP sockets being used, introduced
by commit c558246ee73e ("mptcp: add statistics for mptcp socket in use").

Similar to the parent commit, it looks like there is no good pre-check
to do here, i.e. dedicated function available in kallsyms. Instead, we
try to get info and if nothing is returned, the test is marked as
skipped.

Link: https://github.com/multipath-tcp/mptcp_net-next/issues/368
Fixes: e04a30f78809 ("selftest: mptcp: add test for mptcp socket in use")
Cc: stable@vger.kernel.org
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/mptcp/diag.sh b/tools/testing/selftests/net/mptcp/diag.sh
index 4a6165389b747ae5d599e3651001144137492231..fa9e09ad97d99ac50ddf08fb56d22d8a57f811b3 100755 (executable)
--- a/tools/testing/selftests/net/mptcp/diag.sh
+++ b/tools/testing/selftests/net/mptcp/diag.sh
@@ -173,7 +173,7 @@ chk_msk_inuse()
                sleep 0.1
        done
 
-       __chk_nr get_msk_inuse $expected "$msg"
+       __chk_nr get_msk_inuse $expected "$msg" 0
 }
 
 # $1: ns, $2: port