ixgbe: ethtool correctly identify autoneg setting

This patch enables ethtool to correctly identify flow control (pause
frame) auto negotiation, as well as disallow enabling it when it is not
supported. The ixgbe_device_supports_autoneg_fc function is exported and
used for this purpose.

There is also one minor cleanup of the device_supports_autoneg_fc by
removing an unnecessary return statement.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

4 files changed, 9 insertions, 3 deletions

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
index 8f285edb5094..5af1eebc32f1 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.c
@@ -65,13 +65,12 @@ static s32 ixgbe_disable_pcie_master(struct ixgbe_hw *hw);
  *  function check the device id to see if the associated phy supports
  *  autoneg flow control.
  **/
-static s32 ixgbe_device_supports_autoneg_fc(struct ixgbe_hw *hw)
+s32 ixgbe_device_supports_autoneg_fc(struct ixgbe_hw *hw)
 {
 
         switch (hw->device_id) {
         case IXGBE_DEV_ID_X540T:
         case IXGBE_DEV_ID_X540T1:
-                return 0;
         case IXGBE_DEV_ID_82599_T3_LOM:
                 return 0;
         default:
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.h b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.h
index 587db4728072..1b65b6cc07bf 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_common.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_common.h
@@ -78,6 +78,7 @@ s32 ixgbe_disable_rx_buff_generic(struct ixgbe_hw *hw);
 s32 ixgbe_enable_rx_buff_generic(struct ixgbe_hw *hw);
 s32 ixgbe_enable_rx_dma_generic(struct ixgbe_hw *hw, u32 regval);
 s32 ixgbe_fc_enable_generic(struct ixgbe_hw *hw);
+s32 ixgbe_device_supports_autoneg_fc(struct ixgbe_hw *hw);
 void ixgbe_fc_autoneg(struct ixgbe_hw *hw);
 
 s32 ixgbe_validate_mac_addr(u8 *mac_addr);
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
index a545728e100c..326858424345 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_ethtool.c
@@ -383,6 +383,11 @@ static int ixgbe_set_pauseparam(struct net_device *netdev,
             (adapter->flags & IXGBE_FLAG_DCB_ENABLED))
                 return -EINVAL;
 
+        /* some devices do not support autoneg of link flow control */
+        if ((pause->autoneg == AUTONEG_ENABLE) &&
+            (ixgbe_device_supports_autoneg_fc(hw) != 0))
+                return -EINVAL;
+
         fc.disable_fc_autoneg = (pause->autoneg != AUTONEG_ENABLE);
 
         if ((pause->rx_pause && pause->tx_pause) || pause->autoneg)
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
index 004ea6caf45f..4f67fdc0d0d8 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
@@ -4567,7 +4567,8 @@ static int __devinit ixgbe_sw_init(struct ixgbe_adapter *adapter)
         ixgbe_pbthresh_setup(adapter);
         hw->fc.pause_time = IXGBE_DEFAULT_FCPAUSE;
         hw->fc.send_xon = true;
-        hw->fc.disable_fc_autoneg = false;
+        hw->fc.disable_fc_autoneg =
+                (ixgbe_device_supports_autoneg_fc(hw) == 0) ? false : true;
 
 #ifdef CONFIG_PCI_IOV
         /* assign number of SR-IOV VFs */