ixgbe: limit small mtu to minimum for ipv4 support

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index cfaa3ca..2c8895e 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -2839,8 +2839,8 @@ static int ixgbe_change_mtu(struct net_device *netdev, int new_mtu)
        struct ixgbe_adapter *adapter = netdev_priv(netdev);
        int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
 
-       if ((max_frame < (ETH_ZLEN + ETH_FCS_LEN)) ||
-           (max_frame > IXGBE_MAX_JUMBO_FRAME_SIZE))
+       /* MTU < 68 is an error and causes problems on some kernels */
+       if ((new_mtu < 68) || (max_frame > IXGBE_MAX_JUMBO_FRAME_SIZE))
                return -EINVAL;
 
        DPRINTK(PROBE, INFO, "changing MTU from %d to %d\n",