selftests: mptcp: list sysctl data

Listing all the values linked to the MPTCP sysctl knobs was not
exercised in MPTCP test suite.

Let's do that to avoid any regressions, but also to have a kernel with a
debug kconfig verifying more assumptions. For the moment, we are not
interested by the output, only to avoid crashes and warnings.

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20241021-net-mptcp-sched-lock-v1-3-637759cf061c@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.sh b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
index 57325d57e4c6e3653019db2de09620d692143683..b48b4e56826a9cfdb3501242b707ae2ebe29b220 100755 (executable)
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
@@ -259,6 +259,15 @@ check_mptcp_disabled()
        mptcp_lib_ns_init disabled_ns
 
        print_larger_title "New MPTCP socket can be blocked via sysctl"
+
+       # mainly to cover more code
+       if ! ip netns exec ${disabled_ns} sysctl net.mptcp >/dev/null; then
+               mptcp_lib_pr_fail "not able to list net.mptcp sysctl knobs"
+               mptcp_lib_result_fail "not able to list net.mptcp sysctl knobs"
+               ret=${KSFT_FAIL}
+               return 1
+       fi
+
        # net.mptcp.enabled should be enabled by default
        if [ "$(ip netns exec ${disabled_ns} sysctl net.mptcp.enabled | awk '{ print $3 }')" -ne 1 ]; then
                mptcp_lib_pr_fail "net.mptcp.enabled sysctl is not 1 by default"