-static inline struct rte_mbuf* __attribute__((always_inline))
-__rte_pktmbuf_prefree_seg(struct rte_mbuf *m)
+/**
+ * Decrease reference counter and unlink a mbuf segment
+ *
+ * This function does the same than a free, except that it does not
+ * return the segment to its pool.
+ * It decreases the reference counter, and if it reaches 0, it is
+ * detached from its parent for an indirect mbuf.
+ *
+ * @param m
+ * The mbuf to be unlinked
+ * @return
+ * - (m) if it is the last reference. It can be recycled or freed.
+ * - (NULL) if the mbuf still has remaining references on it.
+ */
+__attribute__((always_inline))
+static inline struct rte_mbuf *
+rte_pktmbuf_prefree_seg(struct rte_mbuf *m)