/* Add/remove callback to insert valid metadata in every Tx packet. */
if (ports[res->port_id].tx_metadata)
add_tx_md_callback(res->port_id);
else
remove_tx_md_callback(res->port_id);
/* Add/remove callback to insert valid metadata in every Tx packet. */
if (ports[res->port_id].tx_metadata)
add_tx_md_callback(res->port_id);
else
remove_tx_md_callback(res->port_id);