[PATCH net 14/17] selftests: mptcp: join: skip MPC backups tests 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 support of sending an MP_PRIO signal for the initial
subflow, introduced by commit c157bbe776b7 ("mptcp: allow the in kernel
PM to set MPC subflow priority").

It is possible to look for "mptcp_subflow_send_ack" in kallsyms because
it was needed to introduce the mentioned feature. So we can know in
advance if the feature is supported instead of trying and accepting any
results.

Link: https://github.com/multipath-tcp/mptcp_net-next/issues/368
Fixes: 914f6a59b10f ("selftests: mptcp: add MPC backup tests")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Matthieu Baerts <matthieu.baerts@xxxxxxxxxxxx>
---
 tools/testing/selftests/net/mptcp/mptcp_join.sh | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/mptcp_join.sh b/tools/testing/selftests/net/mptcp/mptcp_join.sh
index 7867bad59253..554fcafd6e8a 100755
--- a/tools/testing/selftests/net/mptcp/mptcp_join.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_join.sh
@@ -2713,14 +2713,16 @@ backup_tests()
 		chk_prio_nr 1 1
 	fi
 
-	if reset "mpc backup"; then
+	if reset "mpc backup" &&
+	   continue_if mptcp_lib_kallsyms_doesnt_have "mptcp_subflow_send_ack$"; then
 		pm_nl_add_endpoint $ns2 10.0.1.2 flags subflow,backup
 		run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow
 		chk_join_nr 0 0 0
 		chk_prio_nr 0 1
 	fi
 
-	if reset "mpc backup both sides"; then
+	if reset "mpc backup both sides" &&
+	   continue_if mptcp_lib_kallsyms_doesnt_have "mptcp_subflow_send_ack$"; then
 		pm_nl_add_endpoint $ns1 10.0.1.1 flags subflow,backup
 		pm_nl_add_endpoint $ns2 10.0.1.2 flags subflow,backup
 		run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow
@@ -2728,14 +2730,16 @@ backup_tests()
 		chk_prio_nr 1 1
 	fi
 
-	if reset "mpc switch to backup"; then
+	if reset "mpc switch to backup" &&
+	   continue_if mptcp_lib_kallsyms_doesnt_have "mptcp_subflow_send_ack$"; then
 		pm_nl_add_endpoint $ns2 10.0.1.2 flags subflow
 		run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow backup
 		chk_join_nr 0 0 0
 		chk_prio_nr 0 1
 	fi
 
-	if reset "mpc switch to backup both sides"; then
+	if reset "mpc switch to backup both sides" &&
+	   continue_if mptcp_lib_kallsyms_doesnt_have "mptcp_subflow_send_ack$"; then
 		pm_nl_add_endpoint $ns1 10.0.1.1 flags subflow
 		pm_nl_add_endpoint $ns2 10.0.1.2 flags subflow
 		run_tests $ns1 $ns2 10.0.1.1 0 0 0 slow backup

-- 
2.40.1