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Commit d53f706d authored by Bruce Allan's avatar Bruce Allan Committed by Jeff Garzik
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e1000e: increase minimum frame size allowed 



Setting an MTU value below 68 was disabling the network connection and
would not reconnect until the driver was reloaded.  Prevent changing the
MTU to anything below 68.

Signed-off-by: default avatarBruce Allan <bruce.w.allan@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent 10f1b492

drivers/net/e1000e/netdev.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -3724,7 +3724,7 @@ static int e1000_change_mtu(struct net_device *netdev, int new_mtu) 
	struct e1000_adapter *adapter = netdev_priv(netdev);

	struct e1000_adapter *adapter = netdev_priv(netdev);

	int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;

	int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;





	if ((max_frame < ETH_ZLEN + ETH_FCS_LEN) ||

	if ((new_mtu < ETH_ZLEN + ETH_FCS_LEN + VLAN_HLEN) ||

	    (max_frame > MAX_JUMBO_FRAME_SIZE)) {

	    (max_frame > MAX_JUMBO_FRAME_SIZE)) {

		e_err("Invalid MTU setting\n");

		e_err("Invalid MTU setting\n");

		return -EINVAL;

		return -EINVAL;