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: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
index 156dfcbc71248bf627382b50ba1288e0cd57fd15..f76f4f5cae59e1052b5d037613c5a870982db537 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_main.c
+++ b/drivers/net/ixgbe/ixgbe_main.c
@@ -2250,9 +2250,16 @@ static void ixgbe_configure_rx(struct ixgbe_adapter *adapter)
        int rx_buf_len;
 
        /* Decide whether to use packet split mode or not */
+       /* On by default */
+       adapter->flags |= IXGBE_FLAG_RX_PS_ENABLED;
+
        /* Do not use packet split if we're in SR-IOV Mode */
-       if (!adapter->num_vfs)
-               adapter->flags |= IXGBE_FLAG_RX_PS_ENABLED;
+       if (adapter->num_vfs)
+               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) {