+ * 'cb' will not modify or free the 'details' argument passed in. It may
+ * delete or modify the queue passed in as its 'queue_id' argument. It may
+ * modify but will not delete any other queue within 'netdev'. If 'cb'
+ * adds new queues, then ->dump_queues is allowed to visit some queues
+ * twice or not at all.
+ */