+/**
+ * Utility macro to make reserving a tailqueue for a particular struct easier.
+ *
+ * @param idx
+ * The tailq idx defined in rte_tail_t to be given to the tail queue.
+ * - used by lookup to find it later
+ *
+ * @param struct_name
+ * The name of the list type we are using. (Generally this is the same as the
+ * first parameter passed to TAILQ_HEAD macro)
+ *
+ * @return
+ * The return value from rte_eal_tailq_reserve, typecast to the appropriate
+ * structure pointer type.
+ * NULL on error, since the tailq_head is the first
+ * element in the rte_tailq_head structure.
+ */
+#define RTE_TAILQ_RESERVE_BY_IDX(idx, struct_name) \
+ (struct struct_name *)(&rte_eal_tailq_reserve_by_idx(idx)->tailq_head)
+