ice: allow 3k MTU for XDP

At this point ice driver is able to work on order 1 pages that are split
onto two 3k buffers. Let's reflect that when user is setting new MTU
size and XDP is present on interface.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 29eea08..363b284 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -4659,6 +4659,18 @@ clear_recovery:
 }
 
 /**
+ * ice_max_xdp_frame_size - returns the maximum allowed frame size for XDP
+ * @vsi: Pointer to VSI structure
+ */
+static int ice_max_xdp_frame_size(struct ice_vsi *vsi)
+{
+       if (PAGE_SIZE >= 8192 || test_bit(ICE_FLAG_LEGACY_RX, vsi->back->flags))
+               return ICE_RXBUF_2048 - XDP_PACKET_HEADROOM;
+       else
+               return ICE_RXBUF_3072;
+}
+
+/**
  * ice_change_mtu - NDO callback to change the MTU
  * @netdev: network interface device structure
  * @new_mtu: new value for maximum frame size
@@ -4678,11 +4690,11 @@ static int ice_change_mtu(struct net_device *netdev, int new_mtu)
        }
 
        if (ice_is_xdp_ena_vsi(vsi)) {
-               int frame_size = ICE_RXBUF_2048 - XDP_PACKET_HEADROOM;
+               int frame_size = ice_max_xdp_frame_size(vsi);
 
                if (new_mtu + ICE_ETH_PKT_HDR_PAD > frame_size) {
                        netdev_err(netdev, "max MTU for XDP usage is %d\n",
-                                  frame_size);
+                                  frame_size - ICE_ETH_PKT_HDR_PAD);
                        return -EINVAL;
                }
        }