Function vq_update_avail_idx

dpdk/drivers/net/virtio/virtqueue.h:453–474

			  uint16_t num);

static inline void
vq_update_avail_idx(struct virtqueue *vq)
{
	if (vq->hw->weak_barriers) {
	/* x86 prefers to using rte_smp_wmb over __atomic_store_n as
	 * it reports a slightly better perf, which comes from the
	 * saved branch by the compiler.
	 * The if and else branches are identical with the smp and
	 * io barriers both defined as compiler barriers on x86.
	 */
#ifdef RTE_ARCH_X86_64
		rte_smp_wmb();
		vq->vq_split.ring.avail->idx = vq->vq_avail_idx;
#else
		__atomic_store_n(&vq->vq_split.ring.avail->idx,
				 vq->vq_avail_idx, __ATOMIC_RELEASE);
#endif
	} else {
		rte_io_wmb();
		vq->vq_split.ring.avail->idx = vq->vq_avail_idx;
	}
}

static inline void
vq_update_avail_ring(struct virtqueue *vq, uint16_t desc_idx)