tap: add APIs for vnet header length

Add APIs to control host header length. First user
will be vhost-net.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/net/tap.c b/net/tap.c
index 2866ff4..4afb314 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -232,6 +232,27 @@ int tap_has_vnet_hdr(VLANClientState *nc)
     return !!s->host_vnet_hdr_len;
 }
 
+int tap_has_vnet_hdr_len(VLANClientState *nc, int len)
+{
+    TAPState *s = DO_UPCAST(TAPState, nc, nc);
+
+    assert(nc->info->type == NET_CLIENT_TYPE_TAP);
+
+    return tap_probe_vnet_hdr_len(s->fd, len);
+}
+
+void tap_set_vnet_hdr_len(VLANClientState *nc, int len)
+{
+    TAPState *s = DO_UPCAST(TAPState, nc, nc);
+
+    assert(nc->info->type == NET_CLIENT_TYPE_TAP);
+    assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) ||
+           len == sizeof(struct virtio_net_hdr));
+
+    tap_fd_set_vnet_hdr_len(s->fd, len);
+    s->host_vnet_hdr_len = len;
+}
+
 void tap_using_vnet_hdr(VLANClientState *nc, int using_vnet_hdr)
 {
     TAPState *s = DO_UPCAST(TAPState, nc, nc);