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ixgb: leave room for extra hardware memory usage

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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>
This commit is contained in:
Jesse Brandeburg 2008-07-08 15:51:22 -07:00 committed by Jeff Garzik
parent 4360386f7d
commit a3dc3da02a
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ixgb/ixgb_main.c
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@ -560,7 +560,7 @@ ixgb_sw_init(struct ixgb_adapter *adapter)
hw->subsystem_id = pdev->subsystem_device; hw->subsystem_id = pdev->subsystem_device;
hw->max_frame_size = netdev->mtu + ENET_HEADER_SIZE + ENET_FCS_LENGTH; 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) if((hw->device_id == IXGB_DEVICE_ID_82597EX)
|| (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4) || (hw->device_id == IXGB_DEVICE_ID_82597EX_CX4)
@ -1573,7 +1573,7 @@ ixgb_change_mtu(struct net_device *netdev, int new_mtu)
return -EINVAL; return -EINVAL;
} }
adapter->rx_buffer_len = max_frame; adapter->rx_buffer_len = max_frame + 8; /* + 8 for errata */
netdev->mtu = new_mtu; netdev->mtu = new_mtu;