fix: acns-datapath-acceleration-mode None should set the API field correctly (#9255)

Author: santhoshmprabhu

src/aks-preview/HISTORY.rst

@@ -11,8 +11,12 @@ To release a new version, please select a new version number (usually plus 1 to
 
 Pending
 +++++++
+
+18.0.0b41
++++++++
 * Fix `--localdns-config` parameter to handle null values in JSON configuration files gracefully, preventing crashes when DNS override sections are null.
 * Add jwtauthenticator commands `az aks jwtauthenticator add/update/show/list/delete` to manage JWT authenticators for a managed cluster.
+* Fix an issue in disabling ACNS performance (--acns-datapath-acceleration-mode None).
 
 18.0.0b40
 +++++++

src/aks-preview/azext_aks_preview/managed_cluster_decorator.py

@@ -3180,7 +3180,7 @@ def set_up_network_profile(self, mc: ManagedCluster) -> ManagedCluster:
                 if acns.security.transit_encryption is None:
                     acns.security.transit_encryption = self.models.AdvancedNetworkingSecurityTransitEncryption()
                 acns.security.transit_encryption.type = acns_transit_encryption_type
-            if acns_datapath_acceleration_mode == CONST_ACNS_DATAPATH_ACCELERATION_MODE_BPFVETH:
+            if acns_datapath_acceleration_mode is not None:
                 if acns.performance is None:
                     acns.performance = self.models.AdvancedNetworkingPerformance()
                 acns.performance.acceleration_mode = acns_datapath_acceleration_mode
@@ -4434,7 +4434,7 @@ def update_acns_in_network_profile(self, mc: ManagedCluster) -> ManagedCluster:
                 if acns.security.transit_encryption is None:
                     acns.security.transit_encryption = self.models.AdvancedNetworkingSecurityTransitEncryption()
                 acns.security.transit_encryption.type = acns_transit_encryption_type
-            if acns_datapath_acceleration_mode == CONST_ACNS_DATAPATH_ACCELERATION_MODE_BPFVETH:
+            if acns_datapath_acceleration_mode is not None:
                 if acns.performance is None:
                     acns.performance = self.models.AdvancedNetworkingPerformance()
                 acns.performance.acceleration_mode = acns_datapath_acceleration_mode