fix comments

cns/middlewares/k8sSwiftV2.go

@@ -237,6 +237,8 @@ func (k *K8sSWIFTv2Middleware) getIPConfig(ctx context.Context, podInfo cns.PodI
 					return nil, errors.Wrap(err, "failed to parse mtpnc subnetAddressSpace prefix")
 				}
 				podIPInfos = append(podIPInfos, podIPInfo)
+				// for windows scenario, it is required to add default route with gatewayIP from CNS
+				k.addDefaultRoute(&podIPInfo, interfaceInfo.GatewayIP)
 			}
 		}
 	}

cns/middlewares/k8sSwiftV2_linux.go

@@ -101,3 +101,5 @@ func addRoutes(cidrs []string, gatewayIP string) []cns.Route {
 func (k *K8sSWIFTv2Middleware) assignSubnetPrefixLengthFields(_ *cns.PodIpInfo, _ v1alpha1.InterfaceInfo, _ string) error {
 	return nil
 }
+
+func (k *K8sSWIFTv2Middleware) addDefaultRoute(_ *cns.PodIpInfo, _ string) {}

cns/middlewares/k8sSwiftV2_windows.go

@@ -46,12 +46,15 @@ func (k *K8sSWIFTv2Middleware) assignSubnetPrefixLengthFields(podIPInfo *cns.Pod
 		},
 		GatewayIPAddress: interfaceInfo.GatewayIP,
 	}
-	// assign the default route with gateway IP
+
+	return nil
+}
+
+// add default route with gateway IP to podIPInfo
+func (k *K8sSWIFTv2Middleware) addDefaultRoute(podIPInfo *cns.PodIpInfo, gwIP string) {
 	route := cns.Route{
 		IPAddress:        "0.0.0.0/0",
-		GatewayIPAddress: interfaceInfo.GatewayIP,
+		GatewayIPAddress: gwIP,
 	}
 	podIPInfo.Routes = append(podIPInfo.Routes, route)
-
-	return nil
 }

cns/middlewares/k8sSwiftV2_windows_test.go

@@ -60,23 +60,44 @@ func TestAssignSubnetPrefixSuccess(t *testing.T) {
 		SubnetAddressSpace: "20.240.1.0/16",
 	}
 
-	routes := []cns.Route{
-		{
-			IPAddress:        "0.0.0.0/0",
-			GatewayIPAddress: gatewayIP,
-		},
-	}
-
 	ipInfo := podIPInfo
 	err := middleware.assignSubnetPrefixLengthFields(&ipInfo, intInfo, ipInfo.PodIPConfig.IPAddress)
 	assert.Equal(t, err, nil)
 	// assert that the function for windows modifies all the expected fields with prefix-length
 	assert.Equal(t, ipInfo.PodIPConfig.PrefixLength, uint8(16))
 	assert.Equal(t, ipInfo.HostPrimaryIPInfo.Gateway, intInfo.GatewayIP)
 	assert.Equal(t, ipInfo.HostPrimaryIPInfo.Subnet, intInfo.SubnetAddressSpace)
+}
+
+func TestAddDefaultRoute(t *testing.T) {
+	middleware := K8sSWIFTv2Middleware{Cli: mock.NewClient()}
+
+	podIPInfo := cns.PodIpInfo{
+		PodIPConfig: cns.IPSubnet{
+			IPAddress:    "20.240.1.242",
+			PrefixLength: 32,
+		},
+		NICType:    cns.DelegatedVMNIC,
+		MacAddress: "12:34:56:78:9a:bc",
+	}
+
+	gatewayIP := "20.240.1.1"
+	intInfo := v1alpha1.InterfaceInfo{
+		GatewayIP:          gatewayIP,
+		SubnetAddressSpace: "20.240.1.0/16",
+	}
+
+	ipInfo := podIPInfo
+	middleware.addDefaultRoute(&ipInfo, intInfo.GatewayIP)
+
+	expectedRoutes := []cns.Route{
+		{
+			IPAddress: "0.0.0.0/0",
+			GatewayIPAddress: gatewayIP,
+		},
+	}
 
-	// compare two slices of routes
-	if !reflect.DeepEqual(ipInfo.Routes, routes) {
-		t.Errorf("got '%+v', expected '%+v'", ipInfo.Routes, routes)
+	if !reflect.DeepEqual(ipInfo.Routes, expectedRoutes) {
+		t.Errorf("got '%+v', expected '%+v'", ipInfo.Routes, expectedRoutes)
 	}
 }