ethtool: Call ethtool's get/set_settings callbacks with cleaned data

This makes sure that when a driver calls the ethtool's
get/set_settings() callback of another driver, the data passed to it
is clean. This guarantees that speed_hi will be zeroed correctly if
the called callback doesn't explicitely set it: we are sure we don't
get a corrupted speed from the underlying driver. We also take care of
setting the cmd field appropriately (ETHTOOL_GSET/SSET).

This applies to dev_ethtool_get_settings(), which now makes sure it
sets up that ethtool command parameter correctly before passing it to
drivers. This also means that whoever calls dev_ethtool_get_settings()
does not have to clean the ethtool command parameter. This function
also becomes an exported symbol instead of an inline.

All drivers visible to make allyesconfig under x86_64 have been
updated.

Signed-off-by: David Decotigny <decot@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/mips/txx9/generic/setup_tx4939.c

@@ -318,19 +318,15 @@ void __init tx4939_sio_init(unsigned int sclk, unsigned int cts_mask)
 }
 
 #if defined(CONFIG_TC35815) || defined(CONFIG_TC35815_MODULE)
-static int tx4939_get_eth_speed(struct net_device *dev)
+static u32 tx4939_get_eth_speed(struct net_device *dev)
 {
-	struct ethtool_cmd cmd = { ETHTOOL_GSET };
-	int speed = 100;	/* default 100Mbps */
-	int err;
-	if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings)
-		return speed;
-	err = dev->ethtool_ops->get_settings(dev, &cmd);
-	if (err < 0)
-		return speed;
-	speed = cmd.speed == SPEED_100 ? 100 : 10;
-	return speed;
+	struct ethtool_cmd cmd;
+	if (dev_ethtool_get_settings(dev, &cmd))
+		return 100;	/* default 100Mbps */
+
+	return ethtool_cmd_speed(&cmd);
 }
+
 static int tx4939_netdev_event(struct notifier_block *this,
 			       unsigned long event,
 			       void *ptr)
@@ -343,8 +339,7 @@ static int tx4939_netdev_event(struct notifier_block *this,
 		else if (dev->irq == TXX9_IRQ_BASE + TX4939_IR_ETH(1))
 			bit = TX4939_PCFG_SPEED1;
 		if (bit) {
-			int speed = tx4939_get_eth_speed(dev);
-			if (speed == 100)
+			if (tx4939_get_eth_speed(dev) == 100)
 				txx9_set64(&tx4939_ccfgptr->pcfg, bit);
 			else
 				txx9_clear64(&tx4939_ccfgptr->pcfg, bit);

drivers/net/e100.c

@@ -1668,7 +1668,7 @@ static void e100_adjust_adaptive_ifs(struct nic *nic, int speed, int duplex)
 static void e100_watchdog(unsigned long data)
 {
 	struct nic *nic = (struct nic *)data;
-	struct ethtool_cmd cmd;
+	struct ethtool_cmd cmd = { .cmd = ETHTOOL_GSET };
 
 	netif_printk(nic, timer, KERN_DEBUG, nic->netdev,
 		     "right now = %ld\n", jiffies);

drivers/net/mdio.c

@@ -176,6 +176,9 @@ static u32 mdio45_get_an(const struct mdio_if_info *mdio, u16 addr)
  * @npage_adv: Modes currently advertised on next pages
  * @npage_lpa: Modes advertised by link partner on next pages
  *
+ * The @ecmd parameter is expected to have been cleared before calling
+ * mdio45_ethtool_gset_npage().
+ *
  * Since the CSRs for auto-negotiation using next pages are not fully
  * standardised, this function does not attempt to decode them.  The
  * caller must pass them in.

drivers/net/mii.c

@@ -58,6 +58,9 @@ static u32 mii_get_an(struct mii_if_info *mii, u16 addr)
  * @mii: MII interface
  * @ecmd: requested ethtool_cmd
  *
+ * The @ecmd parameter is expected to have been cleared before calling
+ * mii_ethtool_gset().
+ *
  * Returns 0 for success, negative on error.
  */
 int mii_ethtool_gset(struct mii_if_info *mii, struct ethtool_cmd *ecmd)

drivers/net/pch_gbe/pch_gbe_main.c

@@ -888,12 +888,12 @@ static void pch_gbe_watchdog(unsigned long data)
 	struct pch_gbe_adapter *adapter = (struct pch_gbe_adapter *)data;
 	struct net_device *netdev = adapter->netdev;
 	struct pch_gbe_hw *hw = &adapter->hw;
-	struct ethtool_cmd cmd;
 
 	pr_debug("right now = %ld\n", jiffies);
 
 	pch_gbe_update_stats(adapter);
 	if ((mii_link_ok(&adapter->mii)) && (!netif_carrier_ok(netdev))) {
+		struct ethtool_cmd cmd = { .cmd = ETHTOOL_GSET };
 		netdev->tx_queue_len = adapter->tx_queue_len;
 		/* mii library handles link maintenance tasks */
 		if (mii_ethtool_gset(&adapter->mii, &cmd)) {
@@ -903,7 +903,7 @@ static void pch_gbe_watchdog(unsigned long data)
 						PCH_GBE_WATCHDOG_PERIOD));
 			return;
 		}
-		hw->mac.link_speed = cmd.speed;
+		hw->mac.link_speed = ethtool_cmd_speed(&cmd);
 		hw->mac.link_duplex = cmd.duplex;
 		/* Set the RGMII control. */
 		pch_gbe_set_rgmii_ctrl(adapter, hw->mac.link_speed,
@@ -913,7 +913,7 @@ static void pch_gbe_watchdog(unsigned long data)
 				 hw->mac.link_duplex);
 		netdev_dbg(netdev,
 			   "Link is Up %d Mbps %s-Duplex\n",
-			   cmd.speed,
+			   hw->mac.link_speed,
 			   cmd.duplex == DUPLEX_FULL ? "Full" : "Half");
 		netif_carrier_on(netdev);
 		netif_wake_queue(netdev);

drivers/net/pch_gbe/pch_gbe_phy.c

@@ -247,7 +247,7 @@ inline void pch_gbe_phy_set_rgmii(struct pch_gbe_hw *hw)
 void pch_gbe_phy_init_setting(struct pch_gbe_hw *hw)
 {
 	struct pch_gbe_adapter *adapter;
-	struct ethtool_cmd     cmd;
+	struct ethtool_cmd     cmd = { .cmd = ETHTOOL_GSET };
 	int ret;
 	u16 mii_reg;
 

drivers/net/pcnet32.c

@@ -2099,7 +2099,7 @@ static int pcnet32_open(struct net_device *dev)
 		int first_phy = -1;
 		u16 bmcr;
 		u32 bcr9;
-		struct ethtool_cmd ecmd;
+		struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 
 		/*
 		 * There is really no good other way to handle multiple PHYs
@@ -2115,9 +2115,9 @@ static int pcnet32_open(struct net_device *dev)
 			ecmd.port = PORT_MII;
 			ecmd.transceiver = XCVR_INTERNAL;
 			ecmd.autoneg = AUTONEG_DISABLE;
-			ecmd.speed =
-			    lp->
-			    options & PCNET32_PORT_100 ? SPEED_100 : SPEED_10;
+			ethtool_cmd_speed_set(&ecmd,
+					      (lp->options & PCNET32_PORT_100) ?
+					      SPEED_100 : SPEED_10);
 			bcr9 = lp->a.read_bcr(ioaddr, 9);
 
 			if (lp->options & PCNET32_PORT_FD) {
@@ -2763,11 +2763,11 @@ static void pcnet32_check_media(struct net_device *dev, int verbose)
 		netif_carrier_on(dev);
 		if (lp->mii) {
 			if (netif_msg_link(lp)) {
-				struct ethtool_cmd ecmd;
+				struct ethtool_cmd ecmd = {
+					.cmd = ETHTOOL_GSET };
 				mii_ethtool_gset(&lp->mii_if, &ecmd);
-				netdev_info(dev, "link up, %sMbps, %s-duplex\n",
-					    (ecmd.speed == SPEED_100)
-					    ? "100" : "10",
+				netdev_info(dev, "link up, %uMbps, %s-duplex\n",
+					    ethtool_cmd_speed(&ecmd),
 					    (ecmd.duplex == DUPLEX_FULL)
 					    ? "full" : "half");
 			}

drivers/net/sfc/mdio_10g.c

@@ -232,12 +232,12 @@ void efx_mdio_set_mmds_lpower(struct efx_nic *efx,
  */
 int efx_mdio_set_settings(struct efx_nic *efx, struct ethtool_cmd *ecmd)
 {
-	struct ethtool_cmd prev;
+	struct ethtool_cmd prev = { .cmd = ETHTOOL_GSET };
 
 	efx->phy_op->get_settings(efx, &prev);
 
 	if (ecmd->advertising == prev.advertising &&
-	    ecmd->speed == prev.speed &&
+	    ethtool_cmd_speed(ecmd) == ethtool_cmd_speed(&prev) &&
 	    ecmd->duplex == prev.duplex &&
 	    ecmd->port == prev.port &&
 	    ecmd->autoneg == prev.autoneg)

drivers/net/stmmac/stmmac_ethtool.c

@@ -237,13 +237,12 @@ stmmac_set_pauseparam(struct net_device *netdev,
 
 	if (phy->autoneg) {
 		if (netif_running(netdev)) {
-			struct ethtool_cmd cmd;
+			struct ethtool_cmd cmd = { .cmd = ETHTOOL_SSET };
 			/* auto-negotiation automatically restarted */
-			cmd.cmd = ETHTOOL_NWAY_RST;
 			cmd.supported = phy->supported;
 			cmd.advertising = phy->advertising;
 			cmd.autoneg = phy->autoneg;
-			cmd.speed = phy->speed;
+			ethtool_cmd_speed_set(&cmd, phy->speed);
 			cmd.duplex = phy->duplex;
 			cmd.phy_address = phy->addr;
 			ret = phy_ethtool_sset(phy, &cmd);

drivers/net/usb/asix.c

@@ -847,7 +847,7 @@ static void ax88172_set_multicast(struct net_device *net)
 static int ax88172_link_reset(struct usbnet *dev)
 {
 	u8 mode;
-	struct ethtool_cmd ecmd;
+	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 
 	mii_check_media(&dev->mii, 1, 1);
 	mii_ethtool_gset(&dev->mii, &ecmd);
@@ -856,8 +856,8 @@ static int ax88172_link_reset(struct usbnet *dev)
 	if (ecmd.duplex != DUPLEX_FULL)
 		mode |= ~AX88172_MEDIUM_FD;
 
-	netdev_dbg(dev->net, "ax88172_link_reset() speed: %d duplex: %d setting mode to 0x%04x\n",
-		   ecmd.speed, ecmd.duplex, mode);
+	netdev_dbg(dev->net, "ax88172_link_reset() speed: %u duplex: %d setting mode to 0x%04x\n",
+		   ethtool_cmd_speed(&ecmd), ecmd.duplex, mode);
 
 	asix_write_medium_mode(dev, mode);
 
@@ -947,20 +947,20 @@ static const struct ethtool_ops ax88772_ethtool_ops = {
 static int ax88772_link_reset(struct usbnet *dev)
 {
 	u16 mode;
-	struct ethtool_cmd ecmd;
+	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 
 	mii_check_media(&dev->mii, 1, 1);
 	mii_ethtool_gset(&dev->mii, &ecmd);
 	mode = AX88772_MEDIUM_DEFAULT;
 
-	if (ecmd.speed != SPEED_100)
+	if (ethtool_cmd_speed(&ecmd) != SPEED_100)
 		mode &= ~AX_MEDIUM_PS;
 
 	if (ecmd.duplex != DUPLEX_FULL)
 		mode &= ~AX_MEDIUM_FD;
 
-	netdev_dbg(dev->net, "ax88772_link_reset() speed: %d duplex: %d setting mode to 0x%04x\n",
-		   ecmd.speed, ecmd.duplex, mode);
+	netdev_dbg(dev->net, "ax88772_link_reset() speed: %u duplex: %d setting mode to 0x%04x\n",
+		   ethtool_cmd_speed(&ecmd), ecmd.duplex, mode);
 
 	asix_write_medium_mode(dev, mode);
 
@@ -1173,18 +1173,20 @@ static int marvell_led_status(struct usbnet *dev, u16 speed)
 static int ax88178_link_reset(struct usbnet *dev)
 {
 	u16 mode;
-	struct ethtool_cmd ecmd;
+	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 	struct asix_data *data = (struct asix_data *)&dev->data;
+	u32 speed;
 
 	netdev_dbg(dev->net, "ax88178_link_reset()\n");
 
 	mii_check_media(&dev->mii, 1, 1);
 	mii_ethtool_gset(&dev->mii, &ecmd);
 	mode = AX88178_MEDIUM_DEFAULT;
+	speed = ethtool_cmd_speed(&ecmd);
 
-	if (ecmd.speed == SPEED_1000)
+	if (speed == SPEED_1000)
 		mode |= AX_MEDIUM_GM;
-	else if (ecmd.speed == SPEED_100)
+	else if (speed == SPEED_100)
 		mode |= AX_MEDIUM_PS;
 	else
 		mode &= ~(AX_MEDIUM_PS | AX_MEDIUM_GM);
@@ -1196,13 +1198,13 @@ static int ax88178_link_reset(struct usbnet *dev)
 	else
 		mode &= ~AX_MEDIUM_FD;
 
-	netdev_dbg(dev->net, "ax88178_link_reset() speed: %d duplex: %d setting mode to 0x%04x\n",
-		   ecmd.speed, ecmd.duplex, mode);
+	netdev_dbg(dev->net, "ax88178_link_reset() speed: %u duplex: %d setting mode to 0x%04x\n",
+		   speed, ecmd.duplex, mode);
 
 	asix_write_medium_mode(dev, mode);
 
 	if (data->phymode == PHY_MODE_MARVELL && data->ledmode)
-		marvell_led_status(dev, ecmd.speed);
+		marvell_led_status(dev, speed);
 
 	return 0;
 }

drivers/net/usb/dm9601.c

@@ -599,13 +599,13 @@ static void dm9601_status(struct usbnet *dev, struct urb *urb)
 
 static int dm9601_link_reset(struct usbnet *dev)
 {
-	struct ethtool_cmd ecmd;
+	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 
 	mii_check_media(&dev->mii, 1, 1);
 	mii_ethtool_gset(&dev->mii, &ecmd);
 
-	netdev_dbg(dev->net, "link_reset() speed: %d duplex: %d\n",
-		   ecmd.speed, ecmd.duplex);
+	netdev_dbg(dev->net, "link_reset() speed: %u duplex: %d\n",
+		   ethtool_cmd_speed(&ecmd), ecmd.duplex);
 
 	return 0;
 }

drivers/net/usb/smsc75xx.c

@@ -503,7 +503,7 @@ static int smsc75xx_update_flowcontrol(struct usbnet *dev, u8 duplex,
 static int smsc75xx_link_reset(struct usbnet *dev)
 {
 	struct mii_if_info *mii = &dev->mii;
-	struct ethtool_cmd ecmd;
+	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 	u16 lcladv, rmtadv;
 	int ret;
 
@@ -519,8 +519,9 @@ static int smsc75xx_link_reset(struct usbnet *dev)
 	lcladv = smsc75xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
 	rmtadv = smsc75xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
 
-	netif_dbg(dev, link, dev->net, "speed: %d duplex: %d lcladv: %04x"
-		" rmtadv: %04x", ecmd.speed, ecmd.duplex, lcladv, rmtadv);
+	netif_dbg(dev, link, dev->net, "speed: %u duplex: %d lcladv: %04x"
+		  " rmtadv: %04x", ethtool_cmd_speed(&ecmd),
+		  ecmd.duplex, lcladv, rmtadv);
 
 	return smsc75xx_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
 }

drivers/net/usb/smsc95xx.c

@@ -457,7 +457,7 @@ static int smsc95xx_link_reset(struct usbnet *dev)
 {
 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
 	struct mii_if_info *mii = &dev->mii;
-	struct ethtool_cmd ecmd;
+	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
 	unsigned long flags;
 	u16 lcladv, rmtadv;
 	u32 intdata;
@@ -472,8 +472,9 @@ static int smsc95xx_link_reset(struct usbnet *dev)
 	lcladv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
 	rmtadv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
 
-	netif_dbg(dev, link, dev->net, "speed: %d duplex: %d lcladv: %04x rmtadv: %04x\n",
-		  ecmd.speed, ecmd.duplex, lcladv, rmtadv);
+	netif_dbg(dev, link, dev->net,
+		  "speed: %u duplex: %d lcladv: %04x rmtadv: %04x\n",
+		  ethtool_cmd_speed(&ecmd), ecmd.duplex, lcladv, rmtadv);
 
 	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
 	if (ecmd.duplex != DUPLEX_FULL) {

drivers/scsi/bnx2fc/bnx2fc_fcoe.c

@@ -664,7 +664,7 @@ static void bnx2fc_link_speed_update(struct fc_lport *lport)
 	struct fcoe_port *port = lport_priv(lport);
 	struct bnx2fc_hba *hba = port->priv;
 	struct net_device *netdev = hba->netdev;
-	struct ethtool_cmd ecmd = { ETHTOOL_GSET };
+	struct ethtool_cmd ecmd;
 
 	if (!dev_ethtool_get_settings(netdev, &ecmd)) {
 		lport->link_supported_speeds &=
@@ -675,12 +675,15 @@ static void bnx2fc_link_speed_update(struct fc_lport *lport)
 		if (ecmd.supported & SUPPORTED_10000baseT_Full)
 			lport->link_supported_speeds |= FC_PORTSPEED_10GBIT;
 
-		if (ecmd.speed == SPEED_1000)
+		switch (ethtool_cmd_speed(&ecmd)) {
+		case SPEED_1000:
 			lport->link_speed = FC_PORTSPEED_1GBIT;
-		if (ecmd.speed == SPEED_10000)
+			break;
+		case SPEED_10000:
 			lport->link_speed = FC_PORTSPEED_10GBIT;
+			break;
+		}
 	}
-	return;
 }
 static int bnx2fc_link_ok(struct fc_lport *lport)
 {

drivers/scsi/fcoe/fcoe.c

@@ -2026,7 +2026,7 @@ static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode)
 int fcoe_link_speed_update(struct fc_lport *lport)
 {
 	struct net_device *netdev = fcoe_netdev(lport);
-	struct ethtool_cmd ecmd = { ETHTOOL_GSET };
+	struct ethtool_cmd ecmd;
 
 	if (!dev_ethtool_get_settings(netdev, &ecmd)) {
 		lport->link_supported_speeds &=
@@ -2037,11 +2037,14 @@ int fcoe_link_speed_update(struct fc_lport *lport)
 		if (ecmd.supported & SUPPORTED_10000baseT_Full)
 			lport->link_supported_speeds |=
 				FC_PORTSPEED_10GBIT;
-		if (ecmd.speed == SPEED_1000)
+		switch (ethtool_cmd_speed(&ecmd)) {
+		case SPEED_1000:
 			lport->link_speed = FC_PORTSPEED_1GBIT;
-		if (ecmd.speed == SPEED_10000)
+			break;
+		case SPEED_10000:
 			lport->link_speed = FC_PORTSPEED_10GBIT;
-
+			break;
+		}
 		return 0;
 	}
 	return -1;

include/linux/ethtool.h

@@ -744,7 +744,9 @@ bool ethtool_invalid_flags(struct net_device *dev, u32 data, u32 supported);
 /**
  * struct ethtool_ops - optional netdev operations
  * @get_settings: Get various device settings including Ethernet link
- *	settings.  Returns a negative error code or zero.
+ *	settings. The @cmd parameter is expected to have been cleared
+ *	before get_settings is called. Returns a negative error code or
+ *	zero.
  * @set_settings: Set various device settings including Ethernet link
  *	settings.  Returns a negative error code or zero.
  * @get_drvinfo: Report driver/device information.  Should only set the