Ignore duplicate macs from mscc_felix and fsl_enetc

mscc_felix and fsl_enetc are drivers representing a switch that is
expected to have duplicate macs. If we encounter either of these
drivers, we should not raise the duplicate mac exception.

LP: #1997922

1 files changed, 16 insertions, 0 deletions

diff --git a/cloudinit/net/__init__.py b/cloudinit/net/__init__.py
index 0a41a2d4..50e445ec 100644
--- a/cloudinit/net/__init__.py
+++ b/cloudinit/net/__init__.py
@@ -1034,6 +1034,22 @@ def get_interfaces_by_mac_on_linux(blacklist_drivers=None) -> dict:
                         % (ret[mac], driver_map[mac], name)
                     )
 
+            # This is intended to be a short-term fix of LP: #1997922
+            # Long term, we should better handle configuration of virtual
+            # devices where duplicate MACs are expected early in boot if
+            # cloud-init happens to enumerate network interfaces before drivers
+            # have fully initialized the leader/subordinate relationships for
+            # those devices or switches.
+            if driver == "mscc_felix" or driver == "fsl_enetc":
+                LOG.debug(
+                    "Ignoring duplicate macs from '%s' and '%s' due to "
+                    "driver '%s'.",
+                    name,
+                    ret[mac],
+                    driver,
+                )
+                continue
+
             if raise_duplicate_mac_error:
                 raise RuntimeError(msg)