igc: Add initial EEE support

IEEE802.3az-2010 Energy Efficient Ethernet has been
approved as standard (September 2010) and the driver
can enable and disable it via ethtool.
Disable the feature by default on parts which support it.
Add enable/disable eee options.
tx-lpi, tx-timer and advertise not supported yet.

Signed-off-by: Sasha Neftin <sasha.neftin@intel.com>
Reviewed-by: Andre Guedes <andre.guedes@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 95 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/igc/igc_ethtool.c b/drivers/net/ethernet/intel/igc/igc_ethtool.c
index 735f3fb47dca..ac331116ea08 100644
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -4,6 +4,7 @@
 /* ethtool support for igc */
 #include <linux/if_vlan.h>
 #include <linux/pm_runtime.h>
+#include <linux/mdio.h>
 
 #include "igc.h"
 #include "igc_diag.h"
@@ -1548,6 +1549,98 @@ static int igc_ethtool_set_priv_flags(struct net_device *netdev, u32 priv_flags)
 	return 0;
 }
 
+static int igc_ethtool_get_eee(struct net_device *netdev,
+			       struct ethtool_eee *edata)
+{
+	struct igc_adapter *adapter = netdev_priv(netdev);
+	struct igc_hw *hw = &adapter->hw;
+	u32 eeer;
+
+	if (hw->dev_spec._base.eee_enable)
+		edata->advertised =
+			mmd_eee_adv_to_ethtool_adv_t(adapter->eee_advert);
+
+	*edata = adapter->eee;
+	edata->supported = SUPPORTED_Autoneg;
+
+	eeer = rd32(IGC_EEER);
+
+	/* EEE status on negotiated link */
+	if (eeer & IGC_EEER_EEE_NEG)
+		edata->eee_active = true;
+
+	if (eeer & IGC_EEER_TX_LPI_EN)
+		edata->tx_lpi_enabled = true;
+
+	edata->eee_enabled = hw->dev_spec._base.eee_enable;
+
+	edata->advertised = SUPPORTED_Autoneg;
+	edata->lp_advertised = SUPPORTED_Autoneg;
+
+	/* Report correct negotiated EEE status for devices that
+	 * wrongly report EEE at half-duplex
+	 */
+	if (adapter->link_duplex == HALF_DUPLEX) {
+		edata->eee_enabled = false;
+		edata->eee_active = false;
+		edata->tx_lpi_enabled = false;
+		edata->advertised &= ~edata->advertised;
+	}
+
+	return 0;
+}
+
+static int igc_ethtool_set_eee(struct net_device *netdev,
+			       struct ethtool_eee *edata)
+{
+	struct igc_adapter *adapter = netdev_priv(netdev);
+	struct igc_hw *hw = &adapter->hw;
+	struct ethtool_eee eee_curr;
+	s32 ret_val;
+
+	memset(&eee_curr, 0, sizeof(struct ethtool_eee));
+
+	ret_val = igc_ethtool_get_eee(netdev, &eee_curr);
+	if (ret_val) {
+		netdev_err(netdev,
+			   "Problem setting EEE advertisement options\n");
+		return -EINVAL;
+	}
+
+	if (eee_curr.eee_enabled) {
+		if (eee_curr.tx_lpi_enabled != edata->tx_lpi_enabled) {
+			netdev_err(netdev,
+				   "Setting EEE tx-lpi is not supported\n");
+			return -EINVAL;
+		}
+
+		/* Tx LPI timer is not implemented currently */
+		if (edata->tx_lpi_timer) {
+			netdev_err(netdev,
+				   "Setting EEE Tx LPI timer is not supported\n");
+			return -EINVAL;
+		}
+	} else if (!edata->eee_enabled) {
+		netdev_err(netdev,
+			   "Setting EEE options are not supported with EEE disabled\n");
+		return -EINVAL;
+	}
+
+	adapter->eee_advert = ethtool_adv_to_mmd_eee_adv_t(edata->advertised);
+	if (hw->dev_spec._base.eee_enable != edata->eee_enabled) {
+		hw->dev_spec._base.eee_enable = edata->eee_enabled;
+		adapter->flags |= IGC_FLAG_EEE;
+
+		/* reset link */
+		if (netif_running(netdev))
+			igc_reinit_locked(adapter);
+		else
+			igc_reset(adapter);
+	}
+
+	return 0;
+}
+
 static int igc_ethtool_begin(struct net_device *netdev)
 {
 	struct igc_adapter *adapter = netdev_priv(netdev);
@@ -1829,6 +1922,8 @@ static const struct ethtool_ops igc_ethtool_ops = {
 	.set_channels		= igc_ethtool_set_channels,
 	.get_priv_flags		= igc_ethtool_get_priv_flags,
 	.set_priv_flags		= igc_ethtool_set_priv_flags,
+	.get_eee		= igc_ethtool_get_eee,
+	.set_eee		= igc_ethtool_set_eee,
 	.begin			= igc_ethtool_begin,
 	.complete		= igc_ethtool_complete,
 	.get_link_ksettings	= igc_ethtool_get_link_ksettings,