ixgbe: Fix the DCB PFC thresholds for 82599

The thresholds for the DCB priority flow control are incorrect for 82599.
This fixes the thresholds to be correct.

Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ixgbe/ixgbe_dcb_82599.c b/drivers/net/ixgbe/ixgbe_dcb_82599.c
index 470b676..f4417fc 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_dcb_82599.c
+++ b/drivers/net/ixgbe/ixgbe_dcb_82599.c
@@ -290,7 +290,7 @@ s32 ixgbe_dcb_config_tx_data_arbiter_82599(struct ixgbe_hw *hw,
 s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw *hw,
                                struct ixgbe_dcb_config *dcb_config)
 {
-       u32 i, reg;
+       u32 i, reg, rx_pba_size;
 
        /* If PFC is disabled globally then fall back to LFC. */
        if (!dcb_config->pfc_mode_enable) {
@@ -301,17 +301,23 @@ s32 ixgbe_dcb_config_pfc_82599(struct ixgbe_hw *hw,
 
        /* Configure PFC Tx thresholds per TC */
        for (i = 0; i < MAX_TRAFFIC_CLASS; i++) {
-               /* Config and remember Tx */
+               if (dcb_config->rx_pba_cfg == pba_equal)
+                       rx_pba_size = IXGBE_RXPBSIZE_64KB;
+               else
+                       rx_pba_size = (i < 4) ? IXGBE_RXPBSIZE_80KB
+                                             : IXGBE_RXPBSIZE_48KB;
+
+               reg = ((rx_pba_size >> 5) & 0xFFE0);
                if (dcb_config->tc_config[i].dcb_pfc == pfc_enabled_full ||
-                   dcb_config->tc_config[i].dcb_pfc == pfc_enabled_tx) {
-                       reg = hw->fc.high_water | IXGBE_FCRTH_FCEN;
-                       IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), reg);
-                       reg = hw->fc.low_water | IXGBE_FCRTL_XONE;
-                       IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), reg);
-               } else {
-                       IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), 0);
-                       IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), 0);
-               }
+                   dcb_config->tc_config[i].dcb_pfc == pfc_enabled_tx)
+                       reg |= IXGBE_FCRTL_XONE;
+               IXGBE_WRITE_REG(hw, IXGBE_FCRTL_82599(i), reg);
+
+               reg = ((rx_pba_size >> 2) & 0xFFE0);
+               if (dcb_config->tc_config[i].dcb_pfc == pfc_enabled_full ||
+                   dcb_config->tc_config[i].dcb_pfc == pfc_enabled_tx)
+                       reg |= IXGBE_FCRTH_FCEN;
+               IXGBE_WRITE_REG(hw, IXGBE_FCRTH_82599(i), reg);
        }
 
        /* Configure pause time (2 TCs per register) */