From e7e834aa71ea9b0d54a862d773a6d7730f1d8293 Mon Sep 17 00:00:00 2001 From: David Ertman Date: Mon, 13 Jan 2014 23:19:27 +0000 Subject: [PATCH] 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 Signed-off-by: Dave Ertman Acked-by: Bruce W. Allan Tested-by: Jeff Pieper Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/e1000e/netdev.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c index d57772327306..6bd1832e3f3e 100644 --- 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); } -- 2.20.1