These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / drivers / net / ethernet / intel / ixgbe / ixgbe_dcb_82599.c

diff --git a/kernel/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c b/kernel/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c
index 3b932fe..23277ab 100644 (file)
--- a/kernel/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c
+++ b/kernel/drivers/net/ethernet/intel/ixgbe/ixgbe_dcb_82599.c
@@ -259,7 +259,13 @@ s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw *hw, u8 pfc_en, u8 *prio_tc)
                        fcrtl = (hw->fc.low_water[i] << 10) | IXGBE_FCRTL_XONE;
                        IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), fcrtl);
                } else {
-                       reg = IXGBE_READ_REG(hw, IXGBE_RXPBSIZE(i)) - 32;
+                       /* In order to prevent Tx hangs when the internal Tx
+                        * switch is enabled we must set the high water mark
+                        * to the Rx packet buffer size - 24KB.  This allows
+                        * the Tx switch to function even under heavy Rx
+                        * workloads.
+                        */
+                       reg = IXGBE_READ_REG(hw, IXGBE_RXPBSIZE(i)) - 24576;
                        IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), 0);
                }