+ /* Chooses an appropriate table for 'cls_rule' within 'ofproto'. On
+ * success, stores the table ID into '*table_idp' and returns 0. On
+ * failure, returns an OpenFlow error code (as returned by ofp_mkerr()).
+ *
+ * The choice of table should be a function of 'cls_rule' and 'ofproto''s
+ * datapath capabilities. It should not depend on the flows already in
+ * 'ofproto''s flow tables. Failure implies that an OpenFlow rule with
+ * 'cls_rule' as its matching condition can never be inserted into
+ * 'ofproto', even starting from an empty flow table.
+ *
+ * If multiple tables are candidates for inserting the flow, the function
+ * should choose one arbitrarily (but deterministically).
+ *
+ * This function will never be called for an ofproto that has only one
+ * table, so it may be NULL in that case. */
+ int (*rule_choose_table)(const struct ofproto *ofproto,
+ const struct cls_rule *cls_rule,
+ uint8_t *table_idp);
+