selftests: mptcp: join: skip PM listener tests if not supported

commit 0471bb479af03874b09350fcfe51d3743a5608de upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 352ffbc1010feda2075391d6a538663b2753b176..e5d479cc6283e7cfa80cba7f502ee4e7b309acd1 100755 (executable)
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -2734,6 +2734,11 @@ 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 |