e1000e: Fix Explicitly set Transmit Control Register

This patch causes the TCTL to be explicitly set to fix a problem with
poor network performance (throughput) on certain silicon when configured
for 100M HDX performance.

Cc: Todd Fujinaka <todd.fujinaka@intel.com>
Signed-off-by: Dave Ertman <davidx.m.ertman@intel.com>
Acked-by: Bruce W. Allan <bruce.w.allan@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index d577723..6bd1832 100644 (file)
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -2898,7 +2898,7 @@ static void e1000_configure_tx(struct e1000_adapter *adapter)
        struct e1000_hw *hw = &adapter->hw;
        struct e1000_ring *tx_ring = adapter->tx_ring;
        u64 tdba;
-       u32 tdlen, tarc;
+       u32 tdlen, tctl, tarc;
 
        /* Setup the HW Tx Head and Tail descriptor pointers */
        tdba = tx_ring->dma;
@@ -2935,6 +2935,12 @@ static void e1000_configure_tx(struct e1000_adapter *adapter)
        /* erratum work around: set txdctl the same for both queues */
        ew32(TXDCTL(1), er32(TXDCTL(0)));
 
+       /* Program the Transmit Control Register */
+       tctl = er32(TCTL);
+       tctl &= ~E1000_TCTL_CT;
+       tctl |= E1000_TCTL_PSP | E1000_TCTL_RTLC |
+               (E1000_COLLISION_THRESHOLD << E1000_CT_SHIFT);
+
        if (adapter->flags & FLAG_TARC_SPEED_MODE_BIT) {
                tarc = er32(TARC(0));
                /* set the speed mode bit, we'll clear it if we're not at
@@ -2965,6 +2971,8 @@ static void e1000_configure_tx(struct e1000_adapter *adapter)
        /* enable Report Status bit */
        adapter->txd_cmd |= E1000_TXD_CMD_RS;
 
+       ew32(TCTL, tctl);
+
        hw->mac.ops.config_collision_dist(hw);
 }