Subject: [PATCH 1/3] sky2: tx pause bug fix

From: Stephen Hemminger <[email-masked]>
Date: Wed, 6 Sep 2006 12:44:47 -0700

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: Stephen Hemminger <[email-masked]>

---

 drivers/net/sky2.c |  123 ++++++++++++++++++----------------------------------
 drivers/net/sky2.h |    2 -
 2 files changed, 43 insertions(+), 82 deletions(-)

1419c8ab49f8fd56bad1ac0d3dcbaf830cd5a5d6
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 7ce0663..a3a4ab2 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -289,7 +289,7 @@ static void sky2_gmac_reset(struct sky2_
 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
 	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
 		/* 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
 			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
 			 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_por
 	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_p
 	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_p
 
 	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
 	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
 		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 ne
 			       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 ne
 
 	sky2_phy_reinit(sky2);
 
-	return err;
+	return 0;
 }
 
 static int sky2_get_coalesce(struct net_device *dev,
diff --git a/drivers/net/sky2.h b/drivers/net/sky2.h
index fa8af9f..a27194c 100644
--- a/drivers/net/sky2.h
+++ b/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,
 };
 
-- 
1.2.4