ds_put_format(string, "n_packets=%"PRIu64", ", fs.packet_count);
ds_put_format(string, "n_bytes=%"PRIu64", ", fs.byte_count);
if (fs.idle_timeout != OFP_FLOW_PERMANENT) {
ds_put_format(string, "n_packets=%"PRIu64", ", fs.packet_count);
ds_put_format(string, "n_bytes=%"PRIu64", ", fs.byte_count);
if (fs.idle_timeout != OFP_FLOW_PERMANENT) {