Function rte_mbuf_refcnt_update

dpdk/lib/mbuf/rte_mbuf.h:397–414

* Adds given value to an mbuf's refcnt and returns its new value. * @param m * Mbuf to update * @param value * Value to add/subtract * @return * Updated value */

 *   Updated value
 */
static inline uint16_t
rte_mbuf_refcnt_update(struct rte_mbuf *m, int16_t value)
{
	/*
	 * The atomic_add is an expensive operation, so we don't want to
	 * call it in the case where we know we are the unique holder of
	 * this mbuf (i.e. ref_cnt == 1). Otherwise, an atomic
	 * operation has to be used because concurrent accesses on the
	 * reference counter can occur.
	 */
	if (likely(rte_mbuf_refcnt_read(m) == 1)) {
		++value;
		rte_mbuf_refcnt_set(m, (uint16_t)value);
		return (uint16_t)value;
	}

	return __rte_mbuf_refcnt_update(m, value);
}

#else /* ! RTE_MBUF_REFCNT_ATOMIC */