tests, net, sanity: Add IPv6 family stack validation

Tests which are marked with the `ipv6` marker are expecting the cluster
to support IPv6. If it does not support IPv6, the infra is considered
incorrect and therefore no tests should execute.

This change refactors the IPv4 sanity check and extends it to cover IPv6
as well.

Follow up changes should convert usages of
`fail_if_not_ipv6_supported_cluster` to a test marker.

Signed-off-by: Edward Haas <[email protected]>

Author: EdDev

tests/network/conftest.py

@@ -224,6 +224,7 @@ def network_sanity(
     network_overhead,
     sriov_workers,
     ipv4_supported_cluster,
+    ipv6_supported_cluster,
     conformance_tests,
 ):
     """
@@ -310,13 +311,13 @@ def _verify_sriov():
                     f"has {len(sriov_workers)} SRIOV-capable worker nodes"
                 )
 
-    def _verify_ipv4():
-        if any(test.get_closest_marker("ipv4") for test in collected_tests):
+    def _verify_ip_family(family, is_supported):
+        if any(test.get_closest_marker(family) for test in collected_tests):
             LOGGER.info("Verifying if the cluster supports running IPV4 tests...")
-            if not ipv4_supported_cluster:
-                failure_msgs.append("IPv4 is not supported in this cluster")
+            if not is_supported:
+                failure_msgs.append(f"{family} is not supported in this cluster")
             else:
-                LOGGER.info("Validated network lane is running against an IPV4 supported cluster")
+                LOGGER.info(f"Validated network lane is running against an {family} supported cluster")
 
     def _verify_bgp_env_vars():
         """Verify if the cluster supports running BGP tests.
@@ -343,7 +344,8 @@ def _verify_bgp_env_vars():
     _verify_service_mesh()
     _verify_jumbo_frame()
     _verify_sriov()
-    _verify_ipv4()
+    _verify_ip_family(family="ipv4", is_supported=ipv4_supported_cluster)
+    _verify_ip_family(family="ipv6", is_supported=ipv6_supported_cluster)
     _verify_bgp_env_vars()
 
     if failure_msgs: