tap: add support for persistance

[vpp.git] / src / vnet / devices / virtio / vhost_user_output.c

diff --git a/src/vnet/devices/virtio/vhost_user_output.c b/src/vnet/devices/virtio/vhost_user_output.c
index a47583d..c1b8fe1 100644 (file)
--- a/src/vnet/devices/virtio/vhost_user_output.c
+++ b/src/vnet/devices/virtio/vhost_user_output.c
@@ -307,6 +307,7 @@ VNET_DEVICE_CLASS_TX_FN (vhost_user_device_class) (vlib_main_t * vm,
   u8 retry = 8;
   u16 copy_len;
   u16 tx_headers_len;
+  u32 or_flags;
 
   if (PREDICT_FALSE (!vui->admin_up))
     {
@@ -400,8 +401,13 @@ retry:
        hdr->hdr.gso_type = VIRTIO_NET_HDR_GSO_NONE;
        hdr->num_buffers = 1;   //This is local, no need to check
 
-       /* Guest supports csum offload? */
-       if (vui->features & (1ULL << FEAT_VIRTIO_NET_F_GUEST_CSUM))
+       or_flags = (b0->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM) ||
+         (b0->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM) ||
+         (b0->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM);
+
+       /* Guest supports csum offload and buffer requires checksum offload? */
+       if (or_flags
+           && (vui->features & (1ULL << FEAT_VIRTIO_NET_F_GUEST_CSUM)))
          vhost_user_handle_tx_offload (vui, b0, &hdr->hdr);
 
        // Prepare a copy order executed later for the header