+ * Remove a key from an existing hash table.
+ * This operation is not multi-thread safe
+ * and should only be called from one thread by default.
+ * Thread safety can be enabled by setting flag during
+ * table creation.
+ * If RTE_HASH_EXTRA_FLAGS_NO_FREE_ON_DEL or
+ * RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY_LF is enabled,
+ * the key index returned by rte_hash_add_key_xxx APIs will not be
+ * freed by this API. rte_hash_free_key_with_position API must be called
+ * additionally to free the index associated with the key.
+ * rte_hash_free_key_with_position API should be called after all
+ * the readers have stopped referencing the entry corresponding to
+ * this key. RCU mechanisms could be used to determine such a state.
+ *
+ * @param h
+ * Hash table to remove the key from.
+ * @param key
+ * Key to remove from the hash table.
+ * @param sig
+ * Precomputed hash value for 'key'.
+ * @return
+ * - -EINVAL if the parameters are invalid.
+ * - -ENOENT if the key is not found.
+ * - A positive value that can be used by the caller as an offset into an
+ * array of user data. This value is unique for this key, and is the same
+ * value that was returned when the key was added.
+ */
+int32_t
+rte_hash_del_key_with_hash(const struct rte_hash *h, const void *key, hash_sig_t sig);
+
+/**
+ * Find a key in the hash table given the position.
+ * This operation is multi-thread safe with regarding to other lookup threads.
+ * Read-write concurrency can be enabled by setting flag during
+ * table creation.
+ *
+ * @param h
+ * Hash table to get the key from.
+ * @param position
+ * Position returned when the key was inserted.
+ * @param key
+ * Output containing a pointer to the key
+ * @return
+ * - 0 if retrieved successfully
+ * - -EINVAL if the parameters are invalid.
+ * - -ENOENT if no valid key is found in the given position.
+ */
+int
+rte_hash_get_key_with_position(const struct rte_hash *h, const int32_t position,
+ void **key);
+
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Free a hash key in the hash table given the position
+ * of the key. This operation is not multi-thread safe and should
+ * only be called from one thread by default. Thread safety
+ * can be enabled by setting flag during table creation.
+ * If RTE_HASH_EXTRA_FLAGS_NO_FREE_ON_DEL or
+ * RTE_HASH_EXTRA_FLAGS_RW_CONCURRENCY_LF is enabled,
+ * the key index returned by rte_hash_del_key_xxx APIs must be freed
+ * using this API. This API should be called after all the readers
+ * have stopped referencing the entry corresponding to this key.
+ * RCU mechanisms could be used to determine such a state.
+ * This API does not validate if the key is already freed.
+ *
+ * @param h
+ * Hash table to free the key from.
+ * @param position
+ * Position returned when the key was deleted.
+ * @return
+ * - 0 if freed successfully
+ * - -EINVAL if the parameters are invalid.
+ */
+__rte_experimental
+int
+rte_hash_free_key_with_position(const struct rte_hash *h,
+ const int32_t position);
+
+/**
+ * Find a key-value pair in the hash table.
+ * This operation is multi-thread safe with regarding to other lookup threads.
+ * Read-write concurrency can be enabled by setting flag during
+ * table creation.
+ *
+ * @param h
+ * Hash table to look in.
+ * @param key
+ * Key to find.
+ * @param data
+ * Output with pointer to data returned from the hash table.
+ * @return
+ * - A positive value that can be used by the caller as an offset into an
+ * array of user data. This value is unique for this key, and is the same
+ * value that was returned when the key was added.
+ * - -EINVAL if the parameters are invalid.
+ * - -ENOENT if the key is not found.
+ */
+int
+rte_hash_lookup_data(const struct rte_hash *h, const void *key, void **data);
+
+/**
+ * Find a key-value pair with a pre-computed hash value
+ * to an existing hash table.
+ * This operation is multi-thread safe with regarding to other lookup threads.
+ * Read-write concurrency can be enabled by setting flag during
+ * table creation.
+ *
+ * @param h
+ * Hash table to look in.
+ * @param key
+ * Key to find.
+ * @param sig
+ * Precomputed hash value for 'key'
+ * @param data
+ * Output with pointer to data returned from the hash table.
+ * @return
+ * - A positive value that can be used by the caller as an offset into an
+ * array of user data. This value is unique for this key, and is the same
+ * value that was returned when the key was added.
+ * - -EINVAL if the parameters are invalid.
+ * - -ENOENT if the key is not found.
+ */
+int
+rte_hash_lookup_with_hash_data(const struct rte_hash *h, const void *key,
+ hash_sig_t sig, void **data);
+
+/**
+ * Find a key in the hash table.
+ * This operation is multi-thread safe with regarding to other lookup threads.
+ * Read-write concurrency can be enabled by setting flag during
+ * table creation.