[PATCH] sky2: tx pause bug fix

Fix problems with transmit pause frames. The driver was telling the
GMAC to flush (not process) pause frames. Manually disabling pause wasn't
working because of problems in the setup.

This maybe the cause of the lockup under load.
	http://bugzilla.kernel.org/show_bug.cgi?id=6839

Patch against netdev-2.6 git tree
Signed-off-by: NStephen Hemminger <shemminger@osdl.org>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

drivers/net/sky2.c

@@ -289,7 +289,7 @@ static void sky2_gmac_reset(struct sky2_hw *hw, unsigned port)
 static void sky2_phy_init(struct sky2_hw *hw, unsigned port)
 {
 	struct sky2_port *sky2 = netdev_priv(hw->dev[port]);
-	u16 ctrl, ct1000, adv, pg, ledctrl, ledover;
+	u16 ctrl, ct1000, adv, pg, ledctrl, ledover, reg;
 
 	if (sky2->autoneg == AUTONEG_ENABLE &&
 	    !(hw->chip_id == CHIP_ID_YUKON_XL || hw->chip_id == CHIP_ID_YUKON_EC_U)) {
@@ -358,6 +358,7 @@ static void sky2_phy_init(struct sky2_hw *hw, unsigned port)
 	ctrl = 0;
 	ct1000 = 0;
 	adv = PHY_AN_CSMA;
+	reg = 0;
 
 	if (sky2->autoneg == AUTONEG_ENABLE) {
 		if (hw->copper) {
@@ -390,21 +391,46 @@ static void sky2_phy_init(struct sky2_hw *hw, unsigned port)
 		/* forced speed/duplex settings */
 		ct1000 = PHY_M_1000C_MSE;
 
-		if (sky2->duplex == DUPLEX_FULL)
-			ctrl |= PHY_CT_DUP_MD;
+		/* Disable auto update for duplex flow control and speed */
+		reg |= GM_GPCR_AU_ALL_DIS;
 
 		switch (sky2->speed) {
 		case SPEED_1000:
 			ctrl |= PHY_CT_SP1000;
+			reg |= GM_GPCR_SPEED_1000;
 			break;
 		case SPEED_100:
 			ctrl |= PHY_CT_SP100;
+			reg |= GM_GPCR_SPEED_100;
 			break;
 		}
 
+		if (sky2->duplex == DUPLEX_FULL) {
+			reg |= GM_GPCR_DUP_FULL;
+			ctrl |= PHY_CT_DUP_MD;
+		} else if (sky2->speed != SPEED_1000 && hw->chip_id != CHIP_ID_YUKON_EC_U) {
+			/* Turn off flow control for 10/100mbps */
+			sky2->rx_pause = 0;
+			sky2->tx_pause = 0;
+		}
+
+		if (!sky2->rx_pause)
+			reg |= GM_GPCR_FC_RX_DIS;
+
+		if (!sky2->tx_pause)
+			reg |= GM_GPCR_FC_TX_DIS;
+
+		/* Forward pause packets to GMAC? */
+		if (sky2->tx_pause || sky2->rx_pause)
+			sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_PAUSE_ON);
+		else
+			sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_PAUSE_OFF);
+
 		ctrl |= PHY_CT_RESET;
 	}
 
+	gma_write16(hw, port, GM_GP_CTRL, reg);
+
 	if (hw->chip_id != CHIP_ID_YUKON_FE)
 		gm_phy_write(hw, port, PHY_MARV_1000T_CTRL, ct1000);
 
@@ -508,6 +534,7 @@ static void sky2_phy_init(struct sky2_hw *hw, unsigned port)
 			gm_phy_write(hw, port, PHY_MARV_LED_OVER, ledover);
 
 	}
+
 	/* Enable phy interrupt on auto-negotiation complete (or link up) */
 	if (sky2->autoneg == AUTONEG_ENABLE)
 		gm_phy_write(hw, port, PHY_MARV_INT_MASK, PHY_M_IS_AN_COMPL);
@@ -570,49 +597,11 @@ static void sky2_mac_init(struct sky2_hw *hw, unsigned port)
 			 gm_phy_read(hw, 1, PHY_MARV_INT_MASK) != 0);
 	}
 
-	if (sky2->autoneg == AUTONEG_DISABLE) {
-		reg = gma_read16(hw, port, GM_GP_CTRL);
-		reg |= GM_GPCR_AU_ALL_DIS;
-		gma_write16(hw, port, GM_GP_CTRL, reg);
-		gma_read16(hw, port, GM_GP_CTRL);
-
-		switch (sky2->speed) {
-		case SPEED_1000:
-			reg &= ~GM_GPCR_SPEED_100;
-			reg |= GM_GPCR_SPEED_1000;
-			break;
-		case SPEED_100:
-			reg &= ~GM_GPCR_SPEED_1000;
-			reg |= GM_GPCR_SPEED_100;
-			break;
-		case SPEED_10:
-			reg &= ~(GM_GPCR_SPEED_1000 | GM_GPCR_SPEED_100);
-			break;
-		}
-
-		if (sky2->duplex == DUPLEX_FULL)
-			reg |= GM_GPCR_DUP_FULL;
-
-		/* turn off pause in 10/100mbps half duplex */
-		else if (sky2->speed != SPEED_1000 &&
-			 hw->chip_id != CHIP_ID_YUKON_EC_U)
-			sky2->tx_pause = sky2->rx_pause = 0;
-	} else
-		reg = GM_GPCR_SPEED_1000 | GM_GPCR_SPEED_100 | GM_GPCR_DUP_FULL;
-
-	if (!sky2->tx_pause && !sky2->rx_pause) {
-		sky2_write32(hw, SK_REG(port, GMAC_CTRL), GMC_PAUSE_OFF);
-		reg |=
-		    GM_GPCR_FC_TX_DIS | GM_GPCR_FC_RX_DIS | GM_GPCR_AU_FCT_DIS;
-	} else if (sky2->tx_pause && !sky2->rx_pause) {
-		/* disable Rx flow-control */
-		reg |= GM_GPCR_FC_RX_DIS | GM_GPCR_AU_FCT_DIS;
-	}
-
-	gma_write16(hw, port, GM_GP_CTRL, reg);
-
 	sky2_read16(hw, SK_REG(port, GMAC_IRQ_SRC));
 
+	/* Enable Transmit FIFO Underrun */
+	sky2_write8(hw, SK_REG(port, GMAC_IRQ_MSK), GMAC_DEF_MSK);
+
 	spin_lock_bh(&sky2->phy_lock);
 	sky2_phy_init(hw, port);
 	spin_unlock_bh(&sky2->phy_lock);
@@ -1529,40 +1518,10 @@ static void sky2_link_up(struct sky2_port *sky2)
 	unsigned port = sky2->port;
 	u16 reg;
 
-	/* Enable Transmit FIFO Underrun */
-	sky2_write8(hw, SK_REG(port, GMAC_IRQ_MSK), GMAC_DEF_MSK);
-
-	reg = gma_read16(hw, port, GM_GP_CTRL);
-	if (sky2->autoneg == AUTONEG_DISABLE) {
-		reg |= GM_GPCR_AU_ALL_DIS;
-
-		/* Is write/read necessary?  Copied from sky2_mac_init */
-		gma_write16(hw, port, GM_GP_CTRL, reg);
-		gma_read16(hw, port, GM_GP_CTRL);
-
-		switch (sky2->speed) {
-		case SPEED_1000:
-			reg &= ~GM_GPCR_SPEED_100;
-			reg |= GM_GPCR_SPEED_1000;
-			break;
-		case SPEED_100:
-			reg &= ~GM_GPCR_SPEED_1000;
-			reg |= GM_GPCR_SPEED_100;
-			break;
-		case SPEED_10:
-			reg &= ~(GM_GPCR_SPEED_1000 | GM_GPCR_SPEED_100);
-			break;
-		}
-	} else
-		reg &= ~GM_GPCR_AU_ALL_DIS;
-
-	if (sky2->duplex == DUPLEX_FULL || sky2->autoneg == AUTONEG_ENABLE)
-		reg |= GM_GPCR_DUP_FULL;
-
 	/* enable Rx/Tx */
+	reg = gma_read16(hw, port, GM_GP_CTRL);
 	reg |= GM_GPCR_RX_ENA | GM_GPCR_TX_ENA;
 	gma_write16(hw, port, GM_GP_CTRL, reg);
-	gma_read16(hw, port, GM_GP_CTRL);
 
 	gm_phy_write(hw, port, PHY_MARV_INT_MASK, PHY_M_DEF_MSK);
 
@@ -1616,7 +1575,6 @@ static void sky2_link_down(struct sky2_port *sky2)
 	reg = gma_read16(hw, port, GM_GP_CTRL);
 	reg &= ~(GM_GPCR_RX_ENA | GM_GPCR_TX_ENA);
 	gma_write16(hw, port, GM_GP_CTRL, reg);
-	gma_read16(hw, port, GM_GP_CTRL);	/* PCI post */
 
 	if (sky2->rx_pause && !sky2->tx_pause) {
 		/* restore Asymmetric Pause bit */
@@ -1633,6 +1591,7 @@ static void sky2_link_down(struct sky2_port *sky2)
 
 	if (netif_msg_link(sky2))
 		printk(KERN_INFO PFX "%s: Link is down.\n", sky2->netdev->name);
+
 	sky2_phy_init(hw, port);
 }
 
@@ -1673,8 +1632,11 @@ static int sky2_autoneg_done(struct sky2_port *sky2, u16 aux)
 	sky2->rx_pause = (aux & PHY_M_PS_RX_P_EN) != 0;
 	sky2->tx_pause = (aux & PHY_M_PS_TX_P_EN) != 0;
 
-	if ((sky2->tx_pause || sky2->rx_pause)
-	    && !(sky2->speed < SPEED_1000 && sky2->duplex == DUPLEX_HALF))
+	if (sky2->duplex == DUPLEX_HALF && sky2->speed != SPEED_1000
+	    && hw->chip_id != CHIP_ID_YUKON_EC_U)
+		sky2->rx_pause = sky2->tx_pause = 0;
+
+	if (sky2->rx_pause || sky2->tx_pause)
 		sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_PAUSE_ON);
 	else
 		sky2_write8(hw, SK_REG(port, GMAC_CTRL), GMC_PAUSE_OFF);
@@ -1700,7 +1662,7 @@ static void sky2_phy_intr(struct sky2_hw *hw, unsigned port)
 		printk(KERN_INFO PFX "%s: phy interrupt status 0x%x 0x%x\n",
 		       sky2->netdev->name, istatus, phystat);
 
-	if (istatus & PHY_M_IS_AN_COMPL) {
+	if (sky2->autoneg == AUTONEG_ENABLE && (istatus & PHY_M_IS_AN_COMPL)) {
 		if (sky2_autoneg_done(sky2, phystat) == 0)
 			sky2_link_up(sky2);
 		goto out;
@@ -2890,7 +2852,6 @@ static int sky2_set_pauseparam(struct net_device *dev,
 			       struct ethtool_pauseparam *ecmd)
 {
 	struct sky2_port *sky2 = netdev_priv(dev);
-	int err = 0;
 
 	sky2->autoneg = ecmd->autoneg;
 	sky2->tx_pause = ecmd->tx_pause != 0;
@@ -2898,7 +2859,7 @@ static int sky2_set_pauseparam(struct net_device *dev,
 
 	sky2_phy_reinit(sky2);
 
-	return err;
+	return 0;
 }
 
 static int sky2_get_coalesce(struct net_device *dev,

drivers/net/sky2.h

@@ -1566,7 +1566,7 @@ enum {
 
 	GMR_FS_ANY_ERR	= GMR_FS_RX_FF_OV | GMR_FS_CRC_ERR |
 			  GMR_FS_FRAGMENT | GMR_FS_LONG_ERR |
-		  	  GMR_FS_MII_ERR | GMR_FS_BAD_FC | GMR_FS_GOOD_FC |
+		  	  GMR_FS_MII_ERR | GMR_FS_BAD_FC |
 			  GMR_FS_UN_SIZE | GMR_FS_JABBER,
 };