ixgbe: Fix Tx Hang issue with lldpad on 82598EB

commit 1eb9ac14c34a948bf1538bfb9034e8ab29099a64 upstream.

This patch fixes an issue with the 82598EB device, where lldpad is causing Tx
Hangs on the card as soon as it attempts to configure DCB for the device. The
adapter will continually Tx hang and reset in a loop.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Tested-by: Jack Morgan <jack.morgan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82598.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82598.c
index d3695edfcb8b7ce6f10bfd5fcf722d55235714cd..a061e37b132bb1efb5b888af714f9c04c387c5d6 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82598.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82598.c
@@ -108,9 +108,8 @@ s32 ixgbe_dcb_config_tx_desc_arbiter_82598(struct ixgbe_hw *hw,
 
        /* Enable arbiter */
        reg &= ~IXGBE_DPMCS_ARBDIS;
-       /* Enable DFP and Recycle mode */
-       reg |= (IXGBE_DPMCS_TDPAC | IXGBE_DPMCS_TRM);
        reg |= IXGBE_DPMCS_TSOEF;
+
        /* Configure Max TSO packet size 34KB including payload and headers */
        reg |= (0x4 << IXGBE_DPMCS_MTSOS_SHIFT);