void ofproto_sflow_add_port(struct ofproto_sflow *, uint16_t odp_port,
const char *netdev_name);
void ofproto_sflow_del_port(struct ofproto_sflow *, uint16_t odp_port);
void ofproto_sflow_add_port(struct ofproto_sflow *, uint16_t odp_port,
const char *netdev_name);
void ofproto_sflow_del_port(struct ofproto_sflow *, uint16_t odp_port);