[dpdk-dev] [RFC PATCH 03/13] add vhost packed ring normal dequeue function

[Marvin Liu <yong.liu@intel.com>]

Rewrite vhost dequeue function which without used ring update.

Signed-off-by: Marvin Liu <yong.liu@intel.com>

diff --git a/lib/librte_vhost/virtio_net.c b/lib/librte_vhost/virtio_net.c
index b877510da..410837122 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -1613,6 +1613,62 @@ virtio_dev_tx_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 	return i;
 }
 
+static __rte_always_inline int
+vhost_dequeue_normal_packed(struct virtio_net *dev,
+		struct vhost_virtqueue *vq,
+		struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts,
+		uint16_t *buf_id, uint16_t *desc_count)
+{
+	struct buf_vector buf_vec[BUF_VECTOR_MAX];
+	uint32_t dummy_len;
+	uint16_t nr_vec = 0;
+	int err;
+
+	if (unlikely(fill_vec_buf_packed(dev, vq,
+					vq->last_avail_idx, desc_count,
+					buf_vec, &nr_vec,
+					buf_id, &dummy_len,
+					VHOST_ACCESS_RO) < 0)) {
+		return -1;
+	}
+
+	*pkts = rte_pktmbuf_alloc(mbuf_pool);
+	if (unlikely(*pkts == NULL)) {
+		RTE_LOG(ERR, VHOST_DATA,
+			"Failed to allocate memory for mbuf.\n");
+		return -1;
+	}
+
+	err = copy_desc_to_mbuf(dev, vq, buf_vec, nr_vec, *pkts,
+			mbuf_pool);
+	if (unlikely(err)) {
+		rte_pktmbuf_free(*pkts);
+		return -1;
+	}
+
+	return 0;
+}
+
+static __rte_always_inline int
+virtio_dev_tx_normal_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
+		struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts)
+{
+
+	uint16_t buf_id, desc_count;
+
+	if (vhost_dequeue_normal_packed(dev, vq, mbuf_pool, pkts, &buf_id,
+		&desc_count))
+			return -1;
+
+	vq->last_avail_idx += desc_count;
+	if (vq->last_avail_idx >= vq->size) {
+		vq->last_avail_idx -= vq->size;
+		vq->avail_wrap_counter ^= 1;
+	}
+
+	return 0;
+}
+
 static __rte_noinline uint16_t
 virtio_dev_tx_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
 	struct rte_mempool *mbuf_pool, struct rte_mbuf **pkts, uint16_t count)
-- 
2.17.1