datapath: Set a large MTU on tunnel devices.

[cascardo/ovs.git] / datapath / linux / compat / ip_tunnel.c

diff --git a/datapath/linux/compat/ip_tunnel.c b/datapath/linux/compat/ip_tunnel.c
index 2d4070e..8190937 100644 (file)
--- a/datapath/linux/compat/ip_tunnel.c
+++ b/datapath/linux/compat/ip_tunnel.c
@@ -137,18 +137,31 @@ static int ip_tunnel_bind_dev(struct net_device *dev)
        return mtu;
 }
 
-int rpl_ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
+int rpl___ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict)
 {
        struct ip_tunnel *tunnel = netdev_priv(dev);
        int t_hlen = tunnel->hlen + sizeof(struct iphdr);
+       int max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen;
 
-       if (new_mtu < 68 ||
-           new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen)
+       if (new_mtu < 68)
                return -EINVAL;
+
+       if (new_mtu > max_mtu) {
+               if (strict)
+                       return -EINVAL;
+
+               new_mtu = max_mtu;
+       }
+
        dev->mtu = new_mtu;
        return 0;
 }
 
+int rpl_ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
+{
+       return rpl___ip_tunnel_change_mtu(dev, new_mtu, true);
+}
+
 static void ip_tunnel_dev_free(struct net_device *dev)
 {
 #ifdef HAVE_DEV_TSTATS