diff mbox

[RFC,NET-NEXT,4/6] e1000: configure and read MDI settings

Message ID 20120725180020.9995.32923.stgit@jbrandeb-snb.jf.intel.com
State RFC, archived
Delegated to: David Miller
Headers show

Commit Message

Jesse Brandeburg July 25, 2012, 6 p.m. UTC 
this is the implementation in e1000 to allow ethtool to force
MDI state, allowing users to work around some improperly
behaving switches.

forcing in this driver is for now only allowed when auto-neg is enabled.

to use must have the matching version of ethtool app that supports
this functionality.

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
CC: Tushar Dave <tushar.n.dave@intel.com>
---

 drivers/net/ethernet/intel/e1000/e1000_ethtool.c |   39 ++++++++++++++++++++++
 drivers/net/ethernet/intel/e1000/e1000_main.c    |    4 ++
 2 files changed, 43 insertions(+), 0 deletions(-)


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Comments

Ben Hutchings July 25, 2012, 10:41 p.m. UTC | #1 
On Wed, 2012-07-25 at 11:00 -0700, Jesse Brandeburg wrote:
> this is the implementation in e1000 to allow ethtool to force
> MDI state, allowing users to work around some improperly
> behaving switches.
> 
> forcing in this driver is for now only allowed when auto-neg is enabled.
> 
> to use must have the matching version of ethtool app that supports
> this functionality.
[...]
> --- a/drivers/net/ethernet/intel/e1000/e1000_main.c
> +++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
> @@ -4939,6 +4939,10 @@ int e1000_set_spd_dplx(struct e1000_adapter *adapter, u32 spd, u8 dplx)
>  	default:
>  		goto err_inval;
>  	}
> +
> +	/* clear MDI, MDI(-X) override is only allowed when autoneg enabled */
> +	hw->mdix = AUTO_ALL_MODES;

You will translate AUTO_ALL_MODES to ETH_TP_MDI_AUTO in
e1000_get_settings, and then treat that as an error in
e1000_set_settings if hw->media_type != e1000_media_type_copper.  So,
does this assignment need to be conditional on hw->media_type ==
e1000_media_type_copper?

Ben.

>  	return 0;
>  
>  err_inval:
>
diff mbox

Patch

diff --git a/drivers/net/ethernet/intel/e1000/e1000_ethtool.c b/drivers/net/ethernet/intel/e1000/e1000_ethtool.c
index 736a7d9..9089d00 100644
--- a/drivers/net/ethernet/intel/e1000/e1000_ethtool.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_ethtool.c
@@ -174,6 +174,20 @@  static int e1000_get_settings(struct net_device *netdev,
 
 	ecmd->autoneg = ((hw->media_type == e1000_media_type_fiber) ||
 			 hw->autoneg) ? AUTONEG_ENABLE : AUTONEG_DISABLE;
+
+	/* MDI-X => 1; MDI => 0 */
+	if ((hw->media_type == e1000_media_type_copper) &&
+	    netif_carrier_ok(netdev))
+		ecmd->eth_tp_mdix = (!!adapter->phy_info.mdix_mode ?
+							ETH_TP_MDI_X :
+							ETH_TP_MDI);
+	else
+		ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID;
+
+	if (hw->mdix == AUTO_ALL_MODES)
+		ecmd->eth_tp_mdix_ctrl = ETH_TP_MDI_AUTO;
+	else
+		ecmd->eth_tp_mdix_ctrl = hw->mdix;
 	return 0;
 }
 
@@ -183,6 +197,22 @@  static int e1000_set_settings(struct net_device *netdev,
 	struct e1000_adapter *adapter = netdev_priv(netdev);
 	struct e1000_hw *hw = &adapter->hw;
 
+	/*
+	 * MDI setting is only allowed when autoneg enabled because
+	 * some hardware doesn't allow MDI setting when speed or
+	 * duplex is forced.
+	 */
+	if (ecmd->eth_tp_mdix_ctrl) {
+		if (hw->media_type != e1000_media_type_copper)
+			return -EOPNOTSUPP;
+
+		if ((ecmd->eth_tp_mdix_ctrl != ETH_TP_MDI_AUTO) &&
+		    (ecmd->autoneg != AUTONEG_ENABLE)) {
+			e_err(drv, "forcing MDI/MDI-X state is not supported when link speed and/or duplex are forced\n");
+			return -EINVAL;
+		}
+	}
+
 	while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
 		msleep(1);
 
@@ -199,12 +229,21 @@  static int e1000_set_settings(struct net_device *netdev,
 		ecmd->advertising = hw->autoneg_advertised;
 	} else {
 		u32 speed = ethtool_cmd_speed(ecmd);
+		/* calling this overrides forced MDI setting */
 		if (e1000_set_spd_dplx(adapter, speed, ecmd->duplex)) {
 			clear_bit(__E1000_RESETTING, &adapter->flags);
 			return -EINVAL;
 		}
 	}
 
+	/* MDI-X => 2; MDI => 1; Auto => 3 */
+	if (ecmd->eth_tp_mdix_ctrl) {
+		if (ecmd->eth_tp_mdix_ctrl == ETH_TP_MDI_AUTO)
+			hw->mdix = AUTO_ALL_MODES;
+		else
+			hw->mdix = ecmd->eth_tp_mdix_ctrl;
+	}
+
 	/* reset the link */
 
 	if (netif_running(adapter->netdev)) {
diff --git a/drivers/net/ethernet/intel/e1000/e1000_main.c b/drivers/net/ethernet/intel/e1000/e1000_main.c
index 3bfbb8d..0ae2fcf 100644
--- a/drivers/net/ethernet/intel/e1000/e1000_main.c
+++ b/drivers/net/ethernet/intel/e1000/e1000_main.c
@@ -4939,6 +4939,10 @@  int e1000_set_spd_dplx(struct e1000_adapter *adapter, u32 spd, u8 dplx)
 	default:
 		goto err_inval;
 	}
+
+	/* clear MDI, MDI(-X) override is only allowed when autoneg enabled */
+	hw->mdix = AUTO_ALL_MODES;
+
 	return 0;
 
 err_inval: