opt: only allow specifies default subnet

(cherry picked from commit 9eb96dd)

pkg/controller/pod.go

@@ -615,8 +615,8 @@ func (c *Controller) getPodDefaultSubnet(pod *v1.Pod) (*kubeovnv1.Subnet, error)
 
 	lsName, lsExist := pod.Annotations[util.LogicalSwitchAnnotation]
 	for _, s := range subnets {
-		if lsExist && lsName != s.Name {
-			continue
+		if lsExist && lsName == s.Name {
+			return s, nil
 		}
 		for _, ns := range s.Spec.Namespaces {
 			if ns == pod.Namespace {
@@ -638,15 +638,10 @@ func (c *Controller) getPodAttachmentSubnet(pod *v1.Pod) ([]*kubeovnv1.Subnet, e
 		return nil, err
 	}
 
-	lsName, lsExist := pod.Annotations[util.LogicalSwitchAnnotation]
 	result := make([]*kubeovnv1.Subnet, 0, len(attachments))
 	for _, attach := range attachments {
 		provider := fmt.Sprintf("%s.%s", attach.Name, attach.Namespace)
-
 		for _, subnet := range subnets {
-			if lsExist && lsName != subnet.Name {
-				continue
-			}
 			if subnet.Spec.Provider == provider {
 				result = append(result, subnet)
 				break