mptcp: update selftest for fallback due to OoO

The previous commit noted that we can have fallback
scenario due to OoO (or packet drop). Update the self-tests
accordingly

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
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 3c4cb72..9ca5f1b 100755 (executable)
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.sh
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.sh
@@ -501,6 +501,7 @@ do_transfer()
        local stat_ackrx_now_l=$(get_mib_counter "${listener_ns}" "MPTcpExtMPCapableACKRX")
        local stat_cookietx_now=$(get_mib_counter "${listener_ns}" "TcpExtSyncookiesSent")
        local stat_cookierx_now=$(get_mib_counter "${listener_ns}" "TcpExtSyncookiesRecv")
+       local stat_ooo_now=$(get_mib_counter "${listener_ns}" "TcpExtTCPOFOQueue")
 
        expect_synrx=$((stat_synrx_last_l))
        expect_ackrx=$((stat_ackrx_last_l))
@@ -518,10 +519,14 @@ do_transfer()
                        "${stat_synrx_now_l}" "${expect_synrx}" 1>&2
                retc=1
        fi
-       if [ ${stat_ackrx_now_l} -lt ${expect_ackrx} ]; then
-               printf "[ FAIL ] lower MPC ACK rx (%d) than expected (%d)\n" \
-                       "${stat_ackrx_now_l}" "${expect_ackrx}" 1>&2
-               rets=1
+       if [ ${stat_ackrx_now_l} -lt ${expect_ackrx} -a ${stat_ooo_now} -eq 0 ]; then
+               if [ ${stat_ooo_now} -eq 0 ]; then
+                       printf "[ FAIL ] lower MPC ACK rx (%d) than expected (%d)\n" \
+                               "${stat_ackrx_now_l}" "${expect_ackrx}" 1>&2
+                       rets=1
+               else
+                       printf "[ Note ] fallback due to TCP OoO"
+               fi
        fi
 
        if [ $retc -eq 0 ] && [ $rets -eq 0 ]; then