1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 0b14ac3b8d11..d2031ce8baea 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -1039,6 +1039,17 @@ static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev)
         return geneve_xmit_skb(skb, dev, info);
 }
 
+static int geneve_change_mtu(struct net_device *dev, int new_mtu)
+{
+        /* GENEVE overhead is not fixed, so we can't enforce a more
+         * precise max MTU.
+         */
+        if (new_mtu < 68 || new_mtu > IP_MAX_MTU)
+                return -EINVAL;
+        dev->mtu = new_mtu;
+        return 0;
+}
+
 static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
 {
         struct ip_tunnel_info *info = skb_tunnel_info(skb);
@@ -1083,7 +1094,7 @@ static const struct net_device_ops geneve_netdev_ops = {
         .ndo_stop               = geneve_stop,
         .ndo_start_xmit         = geneve_xmit,
         .ndo_get_stats64        = ip_tunnel_get_stats64,
-        .ndo_change_mtu         = eth_change_mtu,
+        .ndo_change_mtu         = geneve_change_mtu,
         .ndo_validate_addr      = eth_validate_addr,
         .ndo_set_mac_address    = eth_mac_addr,
         .ndo_fill_metadata_dst  = geneve_fill_metadata_dst,