- /* Stores in 'ports' information about up to 'n' ports attached to 'dpif',
- * in no particular order. Returns the number of ports attached to 'dpif'
- * (not the number stored), if successful, otherwise a negative errno
- * value. */
- int (*port_list)(const struct dpif *dpif, struct odp_port *ports, int n);
+ /* Returns one greater than the largest port number accepted in flow
+ * actions. */
+ int (*get_max_ports)(const struct dpif *dpif);
+
+ /* Attempts to begin dumping the ports in a dpif. On success, returns 0
+ * and initializes '*statep' with any data needed for iteration. On
+ * failure, returns a positive errno value. */
+ int (*port_dump_start)(const struct dpif *dpif, void **statep);
+
+ /* Attempts to retrieve another port from 'dpif' for 'state', which was
+ * initialized by a successful call to the 'port_dump_start' function for
+ * 'dpif'. On success, stores a new dpif_port into 'port' and returns 0.
+ * Returns EOF if the end of the port table has been reached, or a positive
+ * errno value on error. This function will not be called again once it
+ * returns nonzero once for a given iteration (but the 'port_dump_done'
+ * function will be called afterward).
+ *
+ * The dpif provider retains ownership of the data stored in 'port'. It
+ * must remain valid until at least the next call to 'port_dump_next' or
+ * 'port_dump_done' for 'state'. */
+ int (*port_dump_next)(const struct dpif *dpif, void *state,
+ struct dpif_port *port);
+
+ /* Releases resources from 'dpif' for 'state', which was initialized by a
+ * successful call to the 'port_dump_start' function for 'dpif'. */
+ int (*port_dump_done)(const struct dpif *dpif, void *state);