[PATCH net-next] selftests/net: Skip srv6_end_dt46_l3vpn_test::host_vpn_tests if iproute2 too old

[Alessio Faina <alessio.faina@canonical.com>]

In case iproute2 is older than version 5.14.0, released ~Sept 1, 2021,
the End.DT46 support is not available and the host_vpn_tests test contained
in the srv6_end_dt46_l3vpn_test.sh file is failing in some kernel backports.
This is the result of those tests:

################################################################################
TEST SECTION: SRv6 VPN connectivity test among hosts in the same tenant
################################################################################

    TEST: IPv6 Hosts connectivity: hs-t100-1 -> hs-t100-2 (tenant 100)  [ FAIL ]

    TEST: IPv4 Hosts connectivity: hs-t100-1 -> hs-t100-2 (tenant 100)  [ FAIL ]

    TEST: IPv6 Hosts connectivity: hs-t100-2 -> hs-t100-1 (tenant 100)  [ FAIL ]

    TEST: IPv4 Hosts connectivity: hs-t100-2 -> hs-t100-1 (tenant 100)  [ FAIL ]

    TEST: IPv6 Hosts connectivity: hs-t200-3 -> hs-t200-4 (tenant 200)  [ FAIL ]

    TEST: IPv4 Hosts connectivity: hs-t200-3 -> hs-t200-4 (tenant 200)  [ FAIL ]

    TEST: IPv6 Hosts connectivity: hs-t200-4 -> hs-t200-3 (tenant 200)  [ FAIL ]

    TEST: IPv4 Hosts connectivity: hs-t200-4 -> hs-t200-3 (tenant 200)  [ FAIL ]

To amend this, check the current running iproute2 supports the required
feature and, if not, just skip the test to avoid a failure.


Signed-off-by: Alessio Faina <alessio.faina@canonical.com>
---
 .../selftests/net/srv6_end_dt46_l3vpn_test.sh       | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/tools/testing/selftests/net/srv6_end_dt46_l3vpn_test.sh b/tools/testing/selftests/net/srv6_end_dt46_l3vpn_test.sh
index a5e959a080bb..406c6a3d253e 100755
--- a/tools/testing/selftests/net/srv6_end_dt46_l3vpn_test.sh
+++ b/tools/testing/selftests/net/srv6_end_dt46_l3vpn_test.sh
@@ -510,12 +510,15 @@ host2gateway_tests()
 host_vpn_tests()
 {
 	log_section "SRv6 VPN connectivity test among hosts in the same tenant"
+	if ip route add help 2>&1 | grep -q -i End.DT46; then
+		check_and_log_hs_connectivity 1 2 100
+		check_and_log_hs_connectivity 2 1 100
 
-	check_and_log_hs_connectivity 1 2 100
-	check_and_log_hs_connectivity 2 1 100
-
-	check_and_log_hs_connectivity 3 4 200
-	check_and_log_hs_connectivity 4 3 200
+		check_and_log_hs_connectivity 3 4 200
+		check_and_log_hs_connectivity 4 3 200
+	else
+		echo "SKIP: SRv6 End.DT46 is unsupported by the installed iproute2 version"
+	fi
 }
 
 host_vpn_isolation_tests()
-- 
2.43.0