+/**
+ * Find lowest start index of chunk of ``n`` free elements, down from specified
+ * index.
+ *
+ * @param arr
+ * Valid pointer to allocated and correctly set up ``rte_fbarray`` structure.
+ *
+ * @param start
+ * Element index to start search from.
+ *
+ * @param n
+ * Number of free elements to look for.
+ *
+ * @return
+ * - non-negative integer on success.
+ * - -1 on failure, with ``rte_errno`` indicating reason for failure.
+ */
+__rte_experimental
+int
+rte_fbarray_find_prev_n_free(struct rte_fbarray *arr, unsigned int start,
+ unsigned int n);
+
+
+/**
+ * Find lowest start index of chunk of ``n`` used elements, down from specified
+ * index.
+ *
+ * @param arr
+ * Valid pointer to allocated and correctly set up ``rte_fbarray`` structure.
+ *
+ * @param start
+ * Element index to start search from.
+ *
+ * @param n
+ * Number of used elements to look for.
+ *
+ * @return
+ * - non-negative integer on success.
+ * - -1 on failure, with ``rte_errno`` indicating reason for failure.
+ */
+__rte_experimental
+int
+rte_fbarray_find_prev_n_used(struct rte_fbarray *arr, unsigned int start,
+ unsigned int n);
+
+
+/**
+ * Find how many more free entries there are before specified index (like
+ * ``rte_fbarray_find_contig_free`` but going in reverse).
+ *
+ * @param arr
+ * Valid pointer to allocated and correctly set up ``rte_fbarray`` structure.
+ *
+ * @param start
+ * Element index to start search from.
+ *
+ * @return
+ * - non-negative integer on success.
+ * - -1 on failure, with ``rte_errno`` indicating reason for failure.
+ */
+__rte_experimental
+int
+rte_fbarray_find_rev_contig_free(struct rte_fbarray *arr,
+ unsigned int start);
+
+
+/**
+ * Find how many more used entries there are before specified index (like
+ * ``rte_fbarray_find_contig_used`` but going in reverse).
+ *
+ * @param arr
+ * Valid pointer to allocated and correctly set up ``rte_fbarray`` structure.
+ *
+ * @param start
+ * Element index to start search from.
+ *
+ * @return
+ * - non-negative integer on success.
+ * - -1 on failure, with ``rte_errno`` indicating reason for failure.
+ */
+__rte_experimental
+int
+rte_fbarray_find_rev_contig_used(struct rte_fbarray *arr, unsigned int start);
+
+
+/**
+ * Find index of biggest chunk of free elements, starting at specified index.
+ *
+ * @param arr
+ * Valid pointer to allocated and correctly set up ``rte_fbarray`` structure.
+ *
+ * @param start
+ * Element index to start search from.
+ *
+ * @return
+ * - non-negative integer on success.
+ * - -1 on failure, with ``rte_errno`` indicating reason for failure.
+ */
+__rte_experimental
+int
+rte_fbarray_find_biggest_free(struct rte_fbarray *arr, unsigned int start);
+
+
+/**
+ * Find index of biggest chunk of used elements, starting at specified index.
+ *
+ * @param arr
+ * Valid pointer to allocated and correctly set up ``rte_fbarray`` structure.
+ *
+ * @param start
+ * Element index to start search from.
+ *
+ * @return
+ * - non-negative integer on success.
+ * - -1 on failure, with ``rte_errno`` indicating reason for failure.
+ */
+__rte_experimental
+int
+rte_fbarray_find_biggest_used(struct rte_fbarray *arr, unsigned int start);
+
+
+/**
+ * Find index of biggest chunk of free elements before a specified index (like
+ * ``rte_fbarray_find_biggest_free``, but going in reverse).
+ *
+ * @param arr
+ * Valid pointer to allocated and correctly set up ``rte_fbarray`` structure.
+ *
+ * @param start
+ * Element index to start search from.
+ *
+ * @return
+ * - non-negative integer on success.
+ * - -1 on failure, with ``rte_errno`` indicating reason for failure.
+ */
+__rte_experimental
+int
+rte_fbarray_find_rev_biggest_free(struct rte_fbarray *arr, unsigned int start);
+
+
+/**
+ * Find index of biggest chunk of used elements before a specified index (like
+ * ``rte_fbarray_find_biggest_used``, but going in reverse).
+ *
+ * @param arr
+ * Valid pointer to allocated and correctly set up ``rte_fbarray`` structure.
+ *
+ * @param start
+ * Element index to start search from.
+ *
+ * @return
+ * - non-negative integer on success.
+ * - -1 on failure, with ``rte_errno`` indicating reason for failure.
+ */
+__rte_experimental
+int
+rte_fbarray_find_rev_biggest_used(struct rte_fbarray *arr, unsigned int start);
+