+ /* Retrieves 'dpif''s sFlow sampling probability into '*probability'.
+ * Return value is 0 or a positive errno value. EOPNOTSUPP indicates that
+ * the datapath does not support sFlow, as does a null pointer.
+ *
+ * A probability of 0 means sample no packets, UINT32_MAX means sample
+ * every packet, and other values are intermediate probabilities. */
+ int (*get_sflow_probability)(const struct dpif *dpif,
+ uint32_t *probability);
+
+ /* Sets 'dpif''s sFlow sampling probability to 'probability'. Return value
+ * is 0 or a positive errno value. EOPNOTSUPP indicates that the datapath
+ * does not support sFlow, as does a null pointer.
+ *
+ * A probability of 0 means sample no packets, UINT32_MAX means sample
+ * every packet, and other values are intermediate probabilities. */
+ int (*set_sflow_probability)(struct dpif *dpif, uint32_t probability);
+