net: Add vnet_hdr_len arguments in NetClientState

Add vnet_hdr_len arguments in NetClientState
that make other module get real vnet_hdr_len easily.

Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

include/net/net.h

@@ -100,6 +100,7 @@ struct NetClientState {
     unsigned int queue_index;
     unsigned rxfilter_notify_enabled:1;
     int vring_enable;
+    int vnet_hdr_len;
     QTAILQ_HEAD(NetFilterHead, NetFilterState) filters;
 };
 

net/net.c

@@ -492,6 +492,7 @@ void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
         return;
     }
 
+    nc->vnet_hdr_len = len;
     nc->info->set_vnet_hdr_len(nc, len);
 }