ixgb: leave room for extra hardware memory usage

ixgb hardware (not ixgbe) has a problem where it might dma past the
end of a buffer in certain cases.  leave 8 bytes extra room.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index ecd5252c4bf4..ec8bce154364 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -560,7 +560,7 @@ ixgb_sw_init(struct ixgb_adapter *adapter)
         hw->subsystem_id = pdev->subsystem_device;
 
         hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH;
-        adapter->rx_buffer_len = hw->max_frame_size;
+        adapter->rx_buffer_len = hw->max_frame_size + 8; /* + 8 for errata */
 
         if((hw->device_id == IXGB_DEVICE_ID_82597EX)
            || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
@@ -1573,7 +1573,7 @@ ixgb_change_mtu(struct net_device *netdev, int new_mtu)
                 return -EINVAL;
         }
 
-        adapter->rx_buffer_len = max_frame;
+        adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
 
         netdev->mtu = new_mtu;