[Intel-wired-lan] [iwl-next v3 4/4] ixgbe: turn off MDD while modifying SRRCTL

[Michal Swiatkowski]

From: Radoslaw Tyl <radoslawx....@intel.com>

Modifying SRRCTL register can generate MDD event.

Turn MDD off during SRRCTL register write to prevent generating MDD.

Fix RCT in ixgbe_set_rx_drop_en().

Reviewed-by: Marcin Szycik <marcin.szy...@linux.intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kits...@intel.com>
Signed-off-by: Radoslaw Tyl <radoslawx....@intel.com>
Signed-off-by: Michal Swiatkowski <michal.swiatkow...@linux.intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c 
b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 22148e65e596..873b46d21042 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -4099,8 +4099,12 @@ void ixgbe_set_rx_drop_en(struct ixgbe_adapter *adapter)
 static void ixgbe_set_rx_drop_en(struct ixgbe_adapter *adapter)
 #endif
 {
-       int i;
        bool pfc_en = adapter->dcb_cfg.pfc_mode_enable;
+       struct ixgbe_hw *hw = &adapter->hw;
+       int i;
+
+       if (hw->mac.ops.disable_mdd)
+               hw->mac.ops.disable_mdd(hw);
 
        if (adapter->ixgbe_ieee_pfc)
                pfc_en |= !!(adapter->ixgbe_ieee_pfc->pfc_en);
@@ -4122,6 +4126,9 @@ static void ixgbe_set_rx_drop_en(struct ixgbe_adapter 
*adapter)
                for (i = 0; i < adapter->num_rx_queues; i++)
                        ixgbe_disable_rx_drop(adapter, adapter->rx_ring[i]);
        }
+
+       if (hw->mac.ops.enable_mdd)
+               hw->mac.ops.enable_mdd(hw);
 }
 
 #define IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT 2
-- 
2.42.0