[dpdk-dev] [RFC PATCH 08/13] add vhost fast dequeue flush function

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

Vhost fast dequeue function will flush used ring immediately.
Descriptor's flag is pre-calculated by macro.

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 83ed2d599..cd51ed47a 100644
--- a/lib/librte_vhost/virtio_net.c
+++ b/lib/librte_vhost/virtio_net.c
@@ -265,6 +265,21 @@ flush_used_fast_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
 	}
 }
 
+static __rte_always_inline void
+flush_dequeue_fast_used_packed(struct virtio_net *dev,
+			struct vhost_virtqueue *vq, uint16_t id,
+			uint16_t id1, uint16_t id2, uint16_t id3)
+{
+	uint16_t flags = 0;
+
+	if (vq->used_wrap_counter)
+		flags = VIRTIO_TX_FLAG_PACKED;
+	else
+		flags = VIRTIO_TX_WRAP_FLAG_PACKED;
+
+	flush_used_fast_packed(dev, vq, 0, 0, 0, 0, id, id1, id2, id3, flags);
+}
+
 static __rte_always_inline void
 flush_enqueue_fast_used_packed(struct virtio_net *dev,
 			struct vhost_virtqueue *vq, uint64_t len,
@@ -1946,6 +1961,8 @@ virtio_dev_tx_fast_packed(struct virtio_net *dev, struct vhost_virtqueue *vq,
 		(void *)(uintptr_t)(desc_addr[3] + buf_offset),
 		pkts[3]->pkt_len);
 
+	flush_dequeue_fast_used_packed(dev, vq, ids[0], ids[1], ids[2],
+				ids[3]);
 	if (virtio_net_with_host_offload(dev)) {
 		hdr = (struct virtio_net_hdr *)((uintptr_t)desc_addr[0]);
 		hdr1 = (struct virtio_net_hdr *)((uintptr_t)desc_addr[1]);
-- 
2.17.1