net: mii: add generic function to support ksetting support

The old ethtool api (get_setting and set_setting) has generic mii
functions mii_ethtool_sset and mii_ethtool_gset.

To support the new ethtool api ({get|set}_link_ksettings), we add
two generics mii function mii_ethtool_{get|set}_link_ksettings_get.
Signed-off-by: Philippe Reynes <tremyfr@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/mii.c

@@ -134,6 +134,101 @@ int mii_ethtool_gset(struct mii_if_info *mii, struct ethtool_cmd *ecmd)
 	return 0;
 }
 
+/**
+ * mii_ethtool_get_link_ksettings - get settings that are specified in @cmd
+ * @mii: MII interface
+ * @cmd: requested ethtool_link_ksettings
+ *
+ * The @cmd parameter is expected to have been cleared before calling
+ * mii_ethtool_get_link_ksettings().
+ *
+ * Returns 0 for success, negative on error.
+ */
+int mii_ethtool_get_link_ksettings(struct mii_if_info *mii,
+				   struct ethtool_link_ksettings *cmd)
+{
+	struct net_device *dev = mii->dev;
+	u16 bmcr, bmsr, ctrl1000 = 0, stat1000 = 0;
+	u32 nego, supported, advertising, lp_advertising;
+
+	supported = (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full |
+		     SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full |
+		     SUPPORTED_Autoneg | SUPPORTED_TP | SUPPORTED_MII);
+	if (mii->supports_gmii)
+		supported |= SUPPORTED_1000baseT_Half |
+			SUPPORTED_1000baseT_Full;
+
+	/* only supports twisted-pair */
+	cmd->base.port = PORT_MII;
+
+	/* this isn't fully supported at higher layers */
+	cmd->base.phy_address = mii->phy_id;
+	cmd->base.mdio_support = ETH_MDIO_SUPPORTS_C22;
+
+	advertising = ADVERTISED_TP | ADVERTISED_MII;
+
+	bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR);
+	bmsr = mii->mdio_read(dev, mii->phy_id, MII_BMSR);
+	if (mii->supports_gmii) {
+		ctrl1000 = mii->mdio_read(dev, mii->phy_id, MII_CTRL1000);
+		stat1000 = mii->mdio_read(dev, mii->phy_id, MII_STAT1000);
+	}
+	if (bmcr & BMCR_ANENABLE) {
+		advertising |= ADVERTISED_Autoneg;
+		cmd->base.autoneg = AUTONEG_ENABLE;
+
+		advertising |= mii_get_an(mii, MII_ADVERTISE);
+		if (mii->supports_gmii)
+			advertising |= mii_ctrl1000_to_ethtool_adv_t(ctrl1000);
+
+		if (bmsr & BMSR_ANEGCOMPLETE) {
+			lp_advertising = mii_get_an(mii, MII_LPA);
+			lp_advertising |=
+					mii_stat1000_to_ethtool_lpa_t(stat1000);
+		} else {
+			lp_advertising = 0;
+		}
+
+		nego = advertising & lp_advertising;
+
+		if (nego & (ADVERTISED_1000baseT_Full |
+			    ADVERTISED_1000baseT_Half)) {
+			cmd->base.speed = SPEED_1000;
+			cmd->base.duplex = !!(nego & ADVERTISED_1000baseT_Full);
+		} else if (nego & (ADVERTISED_100baseT_Full |
+				   ADVERTISED_100baseT_Half)) {
+			cmd->base.speed = SPEED_100;
+			cmd->base.duplex = !!(nego & ADVERTISED_100baseT_Full);
+		} else {
+			cmd->base.speed = SPEED_10;
+			cmd->base.duplex = !!(nego & ADVERTISED_10baseT_Full);
+		}
+	} else {
+		cmd->base.autoneg = AUTONEG_DISABLE;
+
+		cmd->base.speed = ((bmcr & BMCR_SPEED1000 &&
+				    (bmcr & BMCR_SPEED100) == 0) ?
+				   SPEED_1000 :
+				   ((bmcr & BMCR_SPEED100) ?
+				    SPEED_100 : SPEED_10));
+		cmd->base.duplex = (bmcr & BMCR_FULLDPLX) ?
+			DUPLEX_FULL : DUPLEX_HALF;
+	}
+
+	mii->full_duplex = cmd->base.duplex;
+
+	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
+						supported);
+	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
+						advertising);
+	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.lp_advertising,
+						lp_advertising);
+
+	/* ignore maxtxpkt, maxrxpkt for now */
+
+	return 0;
+}
+
 /**
  * mii_ethtool_sset - set settings that are specified in @ecmd
  * @mii: MII interface
@@ -226,6 +321,104 @@ int mii_ethtool_sset(struct mii_if_info *mii, struct ethtool_cmd *ecmd)
 	return 0;
 }
 
+/**
+ * mii_ethtool_set_link_ksettings - set settings that are specified in @cmd
+ * @mii: MII interfaces
+ * @cmd: requested ethtool_link_ksettings
+ *
+ * Returns 0 for success, negative on error.
+ */
+int mii_ethtool_set_link_ksettings(struct mii_if_info *mii,
+				   const struct ethtool_link_ksettings *cmd)
+{
+	struct net_device *dev = mii->dev;
+	u32 speed = cmd->base.speed;
+
+	if (speed != SPEED_10 &&
+	    speed != SPEED_100 &&
+	    speed != SPEED_1000)
+		return -EINVAL;
+	if (cmd->base.duplex != DUPLEX_HALF && cmd->base.duplex != DUPLEX_FULL)
+		return -EINVAL;
+	if (cmd->base.port != PORT_MII)
+		return -EINVAL;
+	if (cmd->base.phy_address != mii->phy_id)
+		return -EINVAL;
+	if (cmd->base.autoneg != AUTONEG_DISABLE &&
+	    cmd->base.autoneg != AUTONEG_ENABLE)
+		return -EINVAL;
+	if ((speed == SPEED_1000) && (!mii->supports_gmii))
+		return -EINVAL;
+
+	/* ignore supported, maxtxpkt, maxrxpkt */
+
+	if (cmd->base.autoneg == AUTONEG_ENABLE) {
+		u32 bmcr, advert, tmp;
+		u32 advert2 = 0, tmp2 = 0;
+		u32 advertising;
+
+		ethtool_convert_link_mode_to_legacy_u32(
+			&advertising, cmd->link_modes.advertising);
+
+		if ((advertising & (ADVERTISED_10baseT_Half |
+				    ADVERTISED_10baseT_Full |
+				    ADVERTISED_100baseT_Half |
+				    ADVERTISED_100baseT_Full |
+				    ADVERTISED_1000baseT_Half |
+				    ADVERTISED_1000baseT_Full)) == 0)
+			return -EINVAL;
+
+		/* advertise only what has been requested */
+		advert = mii->mdio_read(dev, mii->phy_id, MII_ADVERTISE);
+		tmp = advert & ~(ADVERTISE_ALL | ADVERTISE_100BASE4);
+		if (mii->supports_gmii) {
+			advert2 = mii->mdio_read(dev, mii->phy_id,
+						 MII_CTRL1000);
+			tmp2 = advert2 &
+				~(ADVERTISE_1000HALF | ADVERTISE_1000FULL);
+		}
+		tmp |= ethtool_adv_to_mii_adv_t(advertising);
+
+		if (mii->supports_gmii)
+			tmp2 |= ethtool_adv_to_mii_ctrl1000_t(advertising);
+		if (advert != tmp) {
+			mii->mdio_write(dev, mii->phy_id, MII_ADVERTISE, tmp);
+			mii->advertising = tmp;
+		}
+		if ((mii->supports_gmii) && (advert2 != tmp2))
+			mii->mdio_write(dev, mii->phy_id, MII_CTRL1000, tmp2);
+
+		/* turn on autonegotiation, and force a renegotiate */
+		bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR);
+		bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART);
+		mii->mdio_write(dev, mii->phy_id, MII_BMCR, bmcr);
+
+		mii->force_media = 0;
+	} else {
+		u32 bmcr, tmp;
+
+		/* turn off auto negotiation, set speed and duplexity */
+		bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR);
+		tmp = bmcr & ~(BMCR_ANENABLE | BMCR_SPEED100 |
+			       BMCR_SPEED1000 | BMCR_FULLDPLX);
+		if (speed == SPEED_1000)
+			tmp |= BMCR_SPEED1000;
+		else if (speed == SPEED_100)
+			tmp |= BMCR_SPEED100;
+		if (cmd->base.duplex == DUPLEX_FULL) {
+			tmp |= BMCR_FULLDPLX;
+			mii->full_duplex = 1;
+		} else {
+			mii->full_duplex = 0;
+		}
+		if (bmcr != tmp)
+			mii->mdio_write(dev, mii->phy_id, MII_BMCR, tmp);
+
+		mii->force_media = 1;
+	}
+	return 0;
+}
+
 /**
  * mii_check_gmii_support - check if the MII supports Gb interfaces
  * @mii: the MII interface
@@ -466,7 +659,9 @@ MODULE_LICENSE("GPL");
 EXPORT_SYMBOL(mii_link_ok);
 EXPORT_SYMBOL(mii_nway_restart);
 EXPORT_SYMBOL(mii_ethtool_gset);
+EXPORT_SYMBOL(mii_ethtool_get_link_ksettings);
 EXPORT_SYMBOL(mii_ethtool_sset);
+EXPORT_SYMBOL(mii_ethtool_set_link_ksettings);
 EXPORT_SYMBOL(mii_check_link);
 EXPORT_SYMBOL(mii_check_media);
 EXPORT_SYMBOL(mii_check_gmii_support);

include/linux/mii.h

@@ -31,7 +31,11 @@ struct mii_if_info {
 extern int mii_link_ok (struct mii_if_info *mii);
 extern int mii_nway_restart (struct mii_if_info *mii);
 extern int mii_ethtool_gset(struct mii_if_info *mii, struct ethtool_cmd *ecmd);
+extern int mii_ethtool_get_link_ksettings(
+	struct mii_if_info *mii, struct ethtool_link_ksettings *cmd);
 extern int mii_ethtool_sset(struct mii_if_info *mii, struct ethtool_cmd *ecmd);
+extern int mii_ethtool_set_link_ksettings(
+	struct mii_if_info *mii, const struct ethtool_link_ksettings *cmd);
 extern int mii_check_gmii_support(struct mii_if_info *mii);
 extern void mii_check_link (struct mii_if_info *mii);
 extern unsigned int mii_check_media (struct mii_if_info *mii,