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

[Marvin Liu]

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

Signed-off-by: Marvin Liu <yong....@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