diff mbox

[RFC,NET-NEXT,5/6] e1000e: implement MDI/MDI-X control

Message ID 20120725180025.9995.5613.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 
some users report issues with link failing when connected to certain
switches.  This gives the user the ability to control the MDI state
from the driver, allowing users to work around some improperly
behaving switches.

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

This is in regards to the related ethtool app patch and
bugzilla.kernel.org bug 11998

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
CC: bruce.w.allan@intel.com
CC: n.poppelier@xs4all.nl
CC: bastien@durel.org
CC: jsveiga@it.eng.br
---

 drivers/net/ethernet/intel/e1000e/ethtool.c |   41 ++++++++++++++++++++++++++-
 1 files changed, 39 insertions(+), 2 deletions(-)


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Comments

Ben Hutchings July 25, 2012, 10:43 p.m. UTC | #1 
On Wed, 2012-07-25 at 11:00 -0700, Jesse Brandeburg wrote:
> some users report issues with link failing when connected to certain
> switches.  This gives the user the ability to control the MDI state
> from the driver, allowing users to work around some improperly
> behaving switches.
> 
> forcing in this driver is for now only allowed when auto-neg is
> enabled.
[...]
> --- a/drivers/net/ethernet/intel/e1000e/ethtool.c
> +++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
[...] 
> @@ -241,6 +246,10 @@ static 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 */
> +	adapter->hw.phy.mdix = AUTO_ALL_MODES;
> +
[...]

I have the same question about this assignment as in e1000.

Ben.
diff mbox

Patch

diff --git a/drivers/net/ethernet/intel/e1000e/ethtool.c b/drivers/net/ethernet/intel/e1000e/ethtool.c
index 0349e24..2e76f06 100644
--- a/drivers/net/ethernet/intel/e1000e/ethtool.c
+++ b/drivers/net/ethernet/intel/e1000e/ethtool.c
@@ -199,6 +199,11 @@  static int e1000_get_settings(struct net_device *netdev,
 	else
 		ecmd->eth_tp_mdix = ETH_TP_MDI_INVALID;
 
+	if (hw->phy.mdix == AUTO_ALL_MODES)
+		ecmd->eth_tp_mdix_ctrl = ETH_TP_MDI_AUTO;
+	else
+		ecmd->eth_tp_mdix_ctrl = hw->phy.mdix;
+
 	return 0;
 }
 
@@ -241,6 +246,10 @@  static 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 */
+	adapter->hw.phy.mdix = AUTO_ALL_MODES;
+
 	return 0;
 
 err_inval:
@@ -264,6 +273,22 @@  static int e1000_set_settings(struct net_device *netdev,
 		return -EINVAL;
 	}
 
+	/*
+	 * 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->phy.media_type != e1000_media_type_copper)
+			return -EOPNOTSUPP;
+
+		if ((ecmd->eth_tp_mdix_ctrl != ETH_TP_MDI_AUTO) &&
+		    (ecmd->autoneg != AUTONEG_ENABLE)) {
+			e_err("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->state))
 		usleep_range(1000, 2000);
 
@@ -282,20 +307,32 @@  static int e1000_set_settings(struct net_device *netdev,
 			hw->fc.requested_mode = e1000_fc_default;
 	} 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->state);
 			return -EINVAL;
 		}
 	}
 
+	/* MDI-X => 2; MDI => 1; Auto => 3 */
+	if (ecmd->eth_tp_mdix_ctrl) {
+		/*
+		 * fix up the value for auto (3 => 0) as zero is mapped
+		 * internally to auto
+		 */
+		if (ecmd->eth_tp_mdix_ctrl == ETH_TP_MDI_AUTO)
+			hw->phy.mdix = AUTO_ALL_MODES;
+		else
+			hw->phy.mdix = ecmd->eth_tp_mdix_ctrl;
+	}
+
 	/* reset the link */
 
 	if (netif_running(adapter->netdev)) {
 		e1000e_down(adapter);
 		e1000e_up(adapter);
-	} else {
+	} else
 		e1000e_reset(adapter);
-	}
 
 	clear_bit(__E1000_RESETTING, &adapter->state);
 	return 0;