ixgbe: fix for 82599 erratum on Header Splitting

commit a124339ad28389093ed15eca990d39c51c5736cc upstream.

We have found a hardware erratum on 82599 hardware that can lead to
unpredictable behavior when Header Splitting mode is enabled.  So
we are no longer enabling this feature on affected hardware.

Please see the 82599 Specification Update for more information.

Signed-off-by: Don Skidmore <donald.c.skidmore@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 20db37e90c6d3cfefc47f54669aa672f844dc3e3..a550d377235ace1c397bcb71dcf6ace1bceaa656 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -2134,6 +2134,10 @@ static void ixgbe_configure_rx(struct ixgbe_adapter *adapter)
        /* Decide whether to use packet split mode or not */
        adapter->flags |= IXGBE_FLAG_RX_PS_ENABLED;
 
+       /* Disable packet split due to 82599 erratum #45 */
+       if (hw->mac.type == ixgbe_mac_82599EB)
+               adapter->flags &= ~IXGBE_FLAG_RX_PS_ENABLED;
+
        /* Set the RX buffer length according to the mode */
        if (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED) {
                rx_buf_len = IXGBE_RX_HDR_SIZE;