selftests: mptcp: join: skip PM listener 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 support of PM listener events introduced by commit
f8c9dfbd875b ("mptcp: add pm listener events").

It is possible to look for "mptcp_event_pm_listener" in kallsyms to know
in advance if the kernel supports this feature.

Link: https://github.com/multipath-tcp/mptcp_net-next/issues/368
Fixes: 178d023208eb ("selftests: mptcp: listener test for in-kernel PM")
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/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 554fcafd6e8a0b3bf9f1b201dfdfeeff1da0a493..0c22efeba675f2fb1c99e1a670652ef68d29e129 100755 (executable)
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -2774,6 +2774,11 @@ verify_listener_events()
                        $e_saddr $e_sport
        fi
 
+       if ! mptcp_lib_kallsyms_has "mptcp_event_pm_listener$"; then
+               printf "[skip]: event not supported\n"
+               return
+       fi
+
        type=$(grep "type:$e_type," $evt |
               sed --unbuffered -n 's/.*\(type:\)\([[:digit:]]*\).*$/\2/p;q')
        family=$(grep "type:$e_type," $evt |