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 e6e349f0c94575ed9e0c5e6245e01aa5918024e6..18044c2a36faae806fab807a59fb6d79e304debc 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -2921,7 +2921,7 @@ 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;