[PATCH RFC 16/16] net: make vhost-net aware of GSO over UDP tunnel hdr layout

[Paolo Abeni]

When the GSO over UDP tunnel offload is enabled, the virtio net
header includes additional fields to support such offload.

The vhost backend must be aware of the exact header layout, to
copy it correctly. The tunnel-related field are present if either
the guest or the host negotiated any UDP tunnel related feature:
add them to host kernel supported features list, to allow qemu
transder to such backend the needed information.

Signed-off-by: Paolo Abeni <pab...@redhat.com>
---
 hw/net/vhost_net.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index 58d7619fc8..c8e02d1732 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -52,6 +52,10 @@ static const int kernel_feature_bits[] = {
     VIRTIO_F_NOTIFICATION_DATA,
     VIRTIO_NET_F_RSC_EXT,
     VIRTIO_NET_F_HASH_REPORT,
+#ifdef CONFIG_INT128
+    VIRTIO_NET_F_GUEST_UDP_TUNNEL_GSO,
+    VIRTIO_NET_F_HOST_UDP_TUNNEL_GSO,
+#endif
     VHOST_INVALID_FEATURE_BIT
 };
 
-- 
2.49.0