tests: layer3-tunnels: Skip bareudp tests if not supported by kernel.

The bareudp tests depend on specific kernel configuration to
succeed.  Skip the test if the feature is not enabled in the
running kernel.

Signed-off-by: Frode Nordahl <frode.nordahl@canonical.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>

tests/system-kmod-macros.at

@@ -237,3 +237,13 @@ m4_define([CHECK_L3L4_CONNTRACK_REASM])
 #
 # The kernel module tests do not use TC offload.
 m4_define([CHECK_NO_TC_OFFLOAD])
+
+# OVS_CHECK_BAREUDP()
+#
+# The feature needs to be enabled in the kernel configuration (CONFIG_BAREUDP)
+# to work.
+m4_define([OVS_CHECK_BAREUDP],
+[
+    AT_SKIP_IF([! ip link add dev ovs_bareudp0 type bareudp dstport 6635 ethertype mpls_uc 2>&1 >/dev/null])
+    AT_CHECK([ip link del dev ovs_bareudp0])
+])

tests/system-layer3-tunnels.at

@@ -154,7 +154,7 @@ OVS_VSWITCHD_STOP
 AT_CLEANUP
 
 AT_SETUP([layer3 - ping over MPLS Bareudp])
-OVS_CHECK_MIN_KERNEL(5, 7)
+OVS_CHECK_BAREUDP()
 OVS_TRAFFIC_VSWITCHD_START([_ADD_BR([br1])])
 ADD_NAMESPACES(at_ns0, at_ns1)
 
@@ -202,7 +202,7 @@ OVS_TRAFFIC_VSWITCHD_STOP
 AT_CLEANUP
 
 AT_SETUP([layer3 - ping over Bareudp])
-OVS_CHECK_MIN_KERNEL(5, 7)
+OVS_CHECK_BAREUDP()
 OVS_TRAFFIC_VSWITCHD_START([_ADD_BR([br1])])
 ADD_NAMESPACES(at_ns0, at_ns1)
 

tests/system-userspace-macros.at

@@ -336,3 +336,11 @@ m4_define([CHECK_L3L4_CONNTRACK_REASM],
 #
 # Userspace tests do not use TC offload.
 m4_define([CHECK_NO_TC_OFFLOAD])
+
+# OVS_CHECK_BAREUDP()
+#
+# The userspace datapath does not support bareudp tunnels.
+m4_define([OVS_CHECK_BAREUDP],
+[
+    AT_SKIP_IF([:])
+])