i40e: add double of VLAN header when computing the max MTU

commit ce45ffb815e8e238f05de1630be3969b6bb15e4e upstream.

Include the second VLAN HLEN into account when computing the maximum
MTU size as other drivers do.

Fixes: 0c8493d90b6b ("i40e: add XDP support for pass and drop actions")
Signed-off-by: Jason Xing <kernelxing@tencent.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Tested-by: Chandan Kumar Rout <chandanx.rout@intel.com> (A Contingent Worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index db1d784d4bd77604fca835c7763cc9b998342862..67b7e3792519137809454db5465eaceee5077be1 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -2480,7 +2480,7 @@ static int i40e_change_mtu(struct net_device *netdev, int new_mtu)
        struct i40e_pf *pf = vsi->back;
 
        if (i40e_enabled_xdp_vsi(vsi)) {
-               int frame_size = new_mtu + ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN;
+               int frame_size = new_mtu + I40E_PACKET_HDR_PAD;
 
                if (frame_size > i40e_max_xdp_frame_size(vsi))
                        return -EINVAL;