ixgbe: Fix FCRTH value in VM-to-VM loopback mode

[karo-tx-linux.git] / drivers / net / ethernet / intel / ixgbe / ixgbe_common.c

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
index 98e1ddde310404906c2bf78656bb84d34b903568..ce61b36b94f10102644d3304359a03d208d60e3f 100644 (file)
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
@@ -2164,10 +2164,11 @@ s32 ixgbe_fc_enable_generic(struct ixgbe_hw *hw)
                        /*
                         * In order to prevent Tx hangs when the internal Tx
                         * switch is enabled we must set the high water mark
-                        * to the maximum FCRTH value.  This allows the Tx
-                        * switch to function even under heavy Rx workloads.
+                        * to the Rx packet buffer size - 24KB.  This allows
+                        * the Tx switch to function even under heavy Rx
+                        * workloads.
                         */
-                       fcrth = IXGBE_READ_REG(hw, IXGBE_RXPBSIZE(i)) - 32;
+                       fcrth = IXGBE_READ_REG(hw, IXGBE_RXPBSIZE(i)) - 24576;
                }
 
                IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), fcrth);