-struct dpif_sflow *dpif_sflow_create(struct dpif *);
+struct dpif_sflow *dpif_sflow_create(void);
+struct dpif_sflow *dpif_sflow_ref(const struct dpif_sflow *);
+void dpif_sflow_unref(struct dpif_sflow *);
+
void dpif_sflow_set_options(struct dpif_sflow *,
const struct ofproto_sflow_options *);
void dpif_sflow_clear(struct dpif_sflow *);
bool dpif_sflow_is_enabled(const struct dpif_sflow *);
void dpif_sflow_add_port(struct dpif_sflow *ds, struct ofport *ofport,
void dpif_sflow_set_options(struct dpif_sflow *,
const struct ofproto_sflow_options *);
void dpif_sflow_clear(struct dpif_sflow *);
bool dpif_sflow_is_enabled(const struct dpif_sflow *);
void dpif_sflow_add_port(struct dpif_sflow *ds, struct ofport *ofport,