net-forcedeth: Add internal loopback support for forcedeth NICs.

Support enabling/disabling/querying internal loopback mode for
forcedeth NICs using ethtool.

Signed-off-by: Sanjay Hortikar <horti@google.com>
Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/nvidia/forcedeth.c b/drivers/net/ethernet/nvidia/forcedeth.c
index d24c45b..e8a5ae3 100644 (file)
--- a/drivers/net/ethernet/nvidia/forcedeth.c
+++ b/drivers/net/ethernet/nvidia/forcedeth.c
@@ -3003,6 +3003,73 @@ static void nv_update_pause(struct net_device *dev, u32 pause_flags)
        }
 }
 
+static void nv_force_linkspeed(struct net_device *dev, int speed, int duplex)
+{
+       struct fe_priv *np = netdev_priv(dev);
+       u8 __iomem *base = get_hwbase(dev);
+       u32 phyreg, txreg;
+       int mii_status;
+
+       np->linkspeed = NVREG_LINKSPEED_FORCE|speed;
+       np->duplex = duplex;
+
+       /* see if gigabit phy */
+       mii_status = mii_rw(dev, np->phyaddr, MII_BMSR, MII_READ);
+       if (mii_status & PHY_GIGABIT) {
+               np->gigabit = PHY_GIGABIT;
+               phyreg = readl(base + NvRegSlotTime);
+               phyreg &= ~(0x3FF00);
+               if ((np->linkspeed & 0xFFF) == NVREG_LINKSPEED_10)
+                       phyreg |= NVREG_SLOTTIME_10_100_FULL;
+               else if ((np->linkspeed & 0xFFF) == NVREG_LINKSPEED_100)
+                       phyreg |= NVREG_SLOTTIME_10_100_FULL;
+               else if ((np->linkspeed & 0xFFF) == NVREG_LINKSPEED_1000)
+                       phyreg |= NVREG_SLOTTIME_1000_FULL;
+               writel(phyreg, base + NvRegSlotTime);
+       }
+
+       phyreg = readl(base + NvRegPhyInterface);
+       phyreg &= ~(PHY_HALF|PHY_100|PHY_1000);
+       if (np->duplex == 0)
+               phyreg |= PHY_HALF;
+       if ((np->linkspeed & NVREG_LINKSPEED_MASK) == NVREG_LINKSPEED_100)
+               phyreg |= PHY_100;
+       else if ((np->linkspeed & NVREG_LINKSPEED_MASK) ==
+                                                       NVREG_LINKSPEED_1000)
+               phyreg |= PHY_1000;
+       writel(phyreg, base + NvRegPhyInterface);
+
+       if (phyreg & PHY_RGMII) {
+               if ((np->linkspeed & NVREG_LINKSPEED_MASK) ==
+                                                       NVREG_LINKSPEED_1000)
+                       txreg = NVREG_TX_DEFERRAL_RGMII_1000;
+               else
+                       txreg = NVREG_TX_DEFERRAL_RGMII_10_100;
+       } else {
+               txreg = NVREG_TX_DEFERRAL_DEFAULT;
+       }
+       writel(txreg, base + NvRegTxDeferral);
+
+       if (np->desc_ver == DESC_VER_1) {
+               txreg = NVREG_TX_WM_DESC1_DEFAULT;
+       } else {
+               if ((np->linkspeed & NVREG_LINKSPEED_MASK) ==
+                                        NVREG_LINKSPEED_1000)
+                       txreg = NVREG_TX_WM_DESC2_3_1000;
+               else
+                       txreg = NVREG_TX_WM_DESC2_3_DEFAULT;
+       }
+       writel(txreg, base + NvRegTxWatermark);
+
+       writel(NVREG_MISC1_FORCE | (np->duplex ? 0 : NVREG_MISC1_HD),
+                       base + NvRegMisc1);
+       pci_push(base);
+       writel(np->linkspeed, base + NvRegLinkSpeed);
+       pci_push(base);
+
+       return;
+}
+
 /**
  * nv_update_linkspeed: Setup the MAC according to the link partner
  * @dev: Network device to be configured
@@ -3024,11 +3091,25 @@ static int nv_update_linkspeed(struct net_device *dev)
        int newls = np->linkspeed;
        int newdup = np->duplex;
        int mii_status;
+       u32 bmcr;
        int retval = 0;
        u32 control_1000, status_1000, phyreg, pause_flags, txreg;
        u32 txrxFlags = 0;
        u32 phy_exp;
 
+       /* If device loopback is enabled, set carrier on and enable max link
+        * speed.
+        */
+       bmcr = mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ);
+       if (bmcr & BMCR_LOOPBACK) {
+               if (netif_running(dev)) {
+                       nv_force_linkspeed(dev, NVREG_LINKSPEED_1000, 1);
+                       if (!netif_carrier_ok(dev))
+                               netif_carrier_on(dev);
+               }
+               return 1;
+       }
+
        /* BMSR_LSTATUS is latched, read it twice:
         * we want the current value.
         */
@@ -4455,6 +4536,61 @@ static int nv_set_pauseparam(struct net_device *dev, struct ethtool_pauseparam*
        return 0;
 }
 
+static int nv_set_loopback(struct net_device *dev, u32 features)
+{
+       struct fe_priv *np = netdev_priv(dev);
+       unsigned long flags;
+       u32 miicontrol;
+       int err, retval = 0;
+
+       spin_lock_irqsave(&np->lock, flags);
+       miicontrol = mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ);
+       if (features & NETIF_F_LOOPBACK) {
+               if (miicontrol & BMCR_LOOPBACK) {
+                       spin_unlock_irqrestore(&np->lock, flags);
+                       netdev_info(dev, "Loopback already enabled\n");
+                       return 0;
+               }
+               nv_disable_irq(dev);
+               /* Turn on loopback mode */
+               miicontrol |= BMCR_LOOPBACK | BMCR_FULLDPLX | BMCR_SPEED1000;
+               err = mii_rw(dev, np->phyaddr, MII_BMCR, miicontrol);
+               if (err) {
+                       retval = PHY_ERROR;
+                       spin_unlock_irqrestore(&np->lock, flags);
+                       phy_init(dev);
+               } else {
+                       if (netif_running(dev)) {
+                               /* Force 1000 Mbps full-duplex */
+                               nv_force_linkspeed(dev, NVREG_LINKSPEED_1000,
+                                                                        1);
+                               /* Force link up */
+                               netif_carrier_on(dev);
+                       }
+                       spin_unlock_irqrestore(&np->lock, flags);
+                       netdev_info(dev,
+                               "Internal PHY loopback mode enabled.\n");
+               }
+       } else {
+               if (!(miicontrol & BMCR_LOOPBACK)) {
+                       spin_unlock_irqrestore(&np->lock, flags);
+                       netdev_info(dev, "Loopback already disabled\n");
+                       return 0;
+               }
+               nv_disable_irq(dev);
+               /* Turn off loopback */
+               spin_unlock_irqrestore(&np->lock, flags);
+               netdev_info(dev, "Internal PHY loopback mode disabled.\n");
+               phy_init(dev);
+       }
+       msleep(500);
+       spin_lock_irqsave(&np->lock, flags);
+       nv_enable_irq(dev);
+       spin_unlock_irqrestore(&np->lock, flags);
+
+       return retval;
+}
+
 static u32 nv_fix_features(struct net_device *dev, u32 features)
 {
        /* vlan is dependent on rx checksum offload */
@@ -4490,6 +4626,13 @@ static int nv_set_features(struct net_device *dev, u32 features)
        struct fe_priv *np = netdev_priv(dev);
        u8 __iomem *base = get_hwbase(dev);
        u32 changed = dev->features ^ features;
+       int retval;
+
+       if ((changed & NETIF_F_LOOPBACK) && netif_running(dev)) {
+               retval = nv_set_loopback(dev, features);
+               if (retval != 0)
+                       return retval;
+       }
 
        if (changed & NETIF_F_RXCSUM) {
                spin_lock_irq(&np->lock);
@@ -5124,6 +5267,12 @@ static int nv_open(struct net_device *dev)
 
        spin_unlock_irq(&np->lock);
 
+       /* If the loopback feature was set while the device was down, make sure
+        * that it's set correctly now.
+        */
+       if (dev->features & NETIF_F_LOOPBACK)
+               nv_set_loopback(dev, dev->features);
+
        return 0;
 out_drain:
        nv_drain_rxtx(dev);
@@ -5328,6 +5477,9 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i
 
        dev->features |= dev->hw_features;
 
+       /* Add loopback capability to the device. */
+       dev->hw_features |= NETIF_F_LOOPBACK;
+
        np->pause_flags = NV_PAUSEFRAME_RX_CAPABLE | NV_PAUSEFRAME_RX_REQ | NV_PAUSEFRAME_AUTONEG;
        if ((id->driver_data & DEV_HAS_PAUSEFRAME_TX_V1) ||
            (id->driver_data & DEV_HAS_PAUSEFRAME_TX_V2) ||
@@ -5603,12 +5755,14 @@ static int __devinit nv_probe(struct pci_dev *pci_dev, const struct pci_device_i
        dev_info(&pci_dev->dev, "ifname %s, PHY OUI 0x%x @ %d, addr %pM\n",
                 dev->name, np->phy_oui, np->phyaddr, dev->dev_addr);
 
-       dev_info(&pci_dev->dev, "%s%s%s%s%s%s%s%s%s%sdesc-v%u\n",
+       dev_info(&pci_dev->dev, "%s%s%s%s%s%s%s%s%s%s%sdesc-v%u\n",
                 dev->features & NETIF_F_HIGHDMA ? "highdma " : "",
                 dev->features & (NETIF_F_IP_CSUM | NETIF_F_SG) ?
                        "csum " : "",
                 dev->features & (NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_TX) ?
                        "vlan " : "",
+                dev->features & (NETIF_F_LOOPBACK) ?
+                       "loopback " : "",
                 id->driver_data & DEV_HAS_POWER_CNTRL ? "pwrctl " : "",
                 id->driver_data & DEV_HAS_MGMT_UNIT ? "mgmt " : "",
                 id->driver_data & DEV_NEED_TIMERIRQ ? "timirq " : "",