Fix datapath acceleration mode

Author: santhoshmprabhu

src/aks-preview/HISTORY.rst

@@ -14,6 +14,10 @@ Pending
 * 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.
 
+18.0.0b41
++++++++
+* Fix an issue in disabling ACNS performance (--acns-datapath-acceleration-mode None).
+
 18.0.0b40
 +++++++
 * Add option `Windows2025` to `--os-sku` for `az aks nodepool add`.

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

src/aks-preview/azext_aks_preview/tests/latest/test_aks_commands.py

@@ -14682,6 +14682,21 @@ def test_aks_create_with_acns_performance(
             ],
         )
 
+        # Update transit encryption type to WireGuard and advanced network policies to L7
+        update_cmd = (
+            "aks update --resource-group={resource_group} --name={name} "
+            "--aks-custom-headers AKSHTTPCustomFeatures=Microsoft.ContainerService/AdvancedNetworkingPerformancePreview "
+            "--enable-acns --acns-datapath-acceleration-mode None"
+        )
+
+        self.cmd(
+            update_cmd,
+            checks=[
+                self.check("provisioningState", "Succeeded"),
+                self.check("networkProfile.advancedNetworking.performance.accelerationMode", "BpfVeth"),
+            ],
+        )
+
         # delete
         self.cmd(
             "aks delete -g {resource_group} -n {name} --yes --no-wait",

src/aks-preview/setup.py

@@ -9,7 +9,7 @@
 
 from setuptools import find_packages, setup
 
-VERSION = "18.0.0b40"
+VERSION = "18.0.0b41"
 
 CLASSIFIERS = [
     "Development Status :: 4 - Beta",