detect VF accelerated gateway interface without explicit configuration

Today, we require that VF accelerated gateway interface must be
explicitly configured. This change allows VF based accelerated gateway
interface without explict configuration.

Signed-off-by: Yun Zhou <[email protected]>

Author: cathy-zhou

go-controller/pkg/node/gateway.go

@@ -627,19 +627,24 @@ func bridgeForInterface(intfName, nodeName,
 		if err != nil {
 			return nil, fmt.Errorf("gateway accelerated interface %s is not valid: %w", config.Gateway.GatewayAcceleratedInterface, err)
 		}
+		gwIntf = config.Gateway.GatewayAcceleratedInterface
 		isGWAcclInterface = true
 		klog.Infof("For gateway accelerated interface %s representor: %s", config.Gateway.GatewayAcceleratedInterface, intfRep)
+	} else {
+		intfRep, err = getRepresentor(gwIntf)
+		if err == nil {
+			isGWAcclInterface = true
+		}
 	}
 
 	if isGWAcclInterface {
-		gatewayAcceleratedInterface := config.Gateway.GatewayAcceleratedInterface
 		bridgeName, _, err := util.RunOVSVsctl("port-to-br", intfRep)
 		if err != nil {
 			return nil, fmt.Errorf("failed to find bridge that has port %s: %w", intfRep, err)
 		}
-		link, err := util.GetNetLinkOps().LinkByName(gatewayAcceleratedInterface)
+		link, err := util.GetNetLinkOps().LinkByName(gwIntf)
 		if err != nil {
-			return nil, fmt.Errorf("failed to get netdevice link for %s: %w", gatewayAcceleratedInterface, err)
+			return nil, fmt.Errorf("failed to get netdevice link for %s: %w", gwIntf, err)
 		}
 		uplinkName, err := util.GetNicName(bridgeName)
 		if err != nil {
@@ -648,7 +653,7 @@ func bridgeForInterface(intfName, nodeName,
 		res.bridgeName = bridgeName
 		res.uplinkName = uplinkName
 		res.gwIfaceRep = intfRep
-		res.gwIface = gatewayAcceleratedInterface
+		res.gwIface = gwIntf
 		res.macAddress = link.Attrs().HardwareAddr
 	} else if bridgeName, _, err := util.RunOVSVsctl("port-to-br", intfName); err == nil {
 		// This is an OVS bridge's internal port