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>
---
v2: 
	- skip entire test suite if iproute2 is too old
v1: https://lore.kernel.org/netdev/20260708152745.2430714-1-alessio.faina@canonical.com/

 .../testing/selftests/net/srv6_end_dt46_l3vpn_test.sh  | 10 ++++++++++
 1 file changed, 10 insertions(+)

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..cd7ac03e3907 100755
--- a/tools/testing/selftests/net/srv6_end_dt46_l3vpn_test.sh
+++ b/tools/testing/selftests/net/srv6_end_dt46_l3vpn_test.sh
@@ -536,6 +536,14 @@ host_vpn_isolation_tests()
 	done
 }
 
+test_iproute2_supp_or_ksft_skip()
+{
+        if ! ip route add help 2>&1 | grep -qo "End.DT46"; then
+                echo "SKIP: Missing SRv6 End.DT46 support in iproute2"
+                exit "${ksft_skip}"
+        fi
+}
+
 if [ "$(id -u)" -ne 0 ];then
 	echo "SKIP: Need root privileges"
 	exit $ksft_skip
@@ -546,6 +554,8 @@ if [ ! -x "$(command -v ip)" ]; then
 	exit $ksft_skip
 fi
 
+test_iproute2_supp_or_ksft_skip
+
 modprobe vrf &>/dev/null
 if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
         echo "SKIP: vrf sysctl does not exist"
-- 
2.43.0