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: 6eba959e0484 ("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 d612b23c2e3f94e4e727085794c4dc237dad5805..1226b4fdbeac05bdf8e61b926be457db535cdf62 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -2702,7 +2702,7 @@ 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;