man: add man for tap vnet_hdr

diff --git a/man/systemd.netdev.xml b/man/systemd.netdev.xml
index 01c31c5ef52764082aefc48fc7d1f76e2a7181b9..ff7b85453f7972e89a76790c65a39fc166b8579a 100644 (file)
--- a/man/systemd.netdev.xml
+++ b/man/systemd.netdev.xml
@@ -562,6 +562,16 @@
         <literal>no</literal>.</para>
         </listitem>
       </varlistentry>
+      <varlistentry>
+        <term><varname>VnetHeader=</varname></term>
+        <listitem><para>Takes a boolean argument. Configures
+        IFF_VNET_HDR flag for a tap device. It allows sending
+        and receiving larger Generic Segmentation Offload (GSO)
+        packets. This may increase throughput significantly.
+        Defaults to
+        <literal>no</literal>.</para>
+        </listitem>
+      </varlistentry>
       <varlistentry>
         <term><varname>User=</varname></term>
         <listitem><para>User to grant access to the