@@ -368,6 +368,7 @@ Kernel response contents:
   ``ETHTOOL_A_LINKMODES_PEER``          bitset  partner link modes
   ``ETHTOOL_A_LINKMODES_SPEED``         u32     link speed (Mb/s)
   ``ETHTOOL_A_LINKMODES_DUPLEX``        u8      duplex mode
+  ``ETHTOOL_A_LINKMODES_MASTER_SLAVE``  u8      Master/slave port mode
   ====================================  ======  ==========================
 
 For ``ETHTOOL_A_LINKMODES_OURS``, value represents advertised modes and mask

@@ -390,6 +391,7 @@ Request contents:
   ``ETHTOOL_A_LINKMODES_PEER``          bitset  partner link modes
   ``ETHTOOL_A_LINKMODES_SPEED``         u32     link speed (Mb/s)
   ``ETHTOOL_A_LINKMODES_DUPLEX``        u8      duplex mode
+  ``ETHTOOL_A_LINKMODES_MASTER_SLAVE``  u8      Master/slave port mode
   ====================================  ======  ==========================
 
 ``ETHTOOL_A_LINKMODES_OURS`` bit set allows setting advertised link modes. If

@@ -294,7 +294,7 @@ int phy_ethtool_ksettings_set(struct phy_device *phydev,
 			 phydev->advertising, autoneg == AUTONEG_ENABLE);
 
 	phydev->duplex = duplex;
-
+	phydev->master_slave_set = cmd->base.master_slave;
 	phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl;
 
 	/* Restart the PHY */

@@ -313,6 +313,7 @@ void phy_ethtool_ksettings_get(struct phy_device *phydev,
 
 	cmd->base.speed = phydev->speed;
 	cmd->base.duplex = phydev->duplex;
+	cmd->base.master_slave = phydev->master_slave_get;
 	if (phydev->interface == PHY_INTERFACE_MODE_MOCA)
 		cmd->base.port = PORT_BNC;
 	else

@@ -9,6 +9,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/bitfield.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/errno.h>

@@ -1772,6 +1773,83 @@ int genphy_setup_forced(struct phy_device *phydev)
 }
 EXPORT_SYMBOL(genphy_setup_forced);
 
+static int genphy_setup_master_slave(struct phy_device *phydev)
+{
+	u16 ctl = 0;
+
+	if (!phydev->is_gigabit_capable)
+		return 0;
+
+	switch (FIELD_GET(PORT_MODE_CFG_MASK, phydev->master_slave_set)) {
+	case PORT_MODE_CFG_MASTER_PREFERRED:
+		ctl |= CTL1000_PREFER_MASTER;
+		break;
+	case PORT_MODE_CFG_SLAVE_PREFERRED:
+		break;
+	case PORT_MODE_CFG_MASTER_FORCE:
+		ctl |= CTL1000_AS_MASTER;
+		/* fallthrough */
+	case PORT_MODE_CFG_SLAVE_FORCE:
+		ctl |= CTL1000_ENABLE_MASTER;
+		break;
+	case PORT_MODE_CFG_UNKNOWN:
+		return 0;
+	default:
+		phydev_warn(phydev, "Unsupported Master/Slave mode\n");
+		return 0;
+	}
+
+	return phy_modify_changed(phydev, MII_CTRL1000,
+				  (CTL1000_ENABLE_MASTER | CTL1000_AS_MASTER |
+				   CTL1000_PREFER_MASTER), ctl);
+}
+
+static int genphy_read_master_slave(struct phy_device *phydev)
+{
+	int cfg, state = 0;
+	u16 val;
+
+	phydev->master_slave_get = 0;
+
+	if (!phydev->is_gigabit_capable)
+		return 0;
+
+	val = phy_read(phydev, MII_CTRL1000);
+	if (val < 0)
+		return val;
+
+	if (val & CTL1000_ENABLE_MASTER) {
+		if (val & CTL1000_AS_MASTER)
+			cfg = PORT_MODE_CFG_MASTER_FORCE;
+		else
+			cfg = PORT_MODE_CFG_SLAVE_FORCE;
+	} else {
+		if (val & CTL1000_PREFER_MASTER)
+			cfg = PORT_MODE_CFG_MASTER_PREFERRED;
+		else
+			cfg = PORT_MODE_CFG_SLAVE_PREFERRED;
+	}
+
+	val = phy_read(phydev, MII_STAT1000);
+	if (val < 0)
+		return val;
+
+	if (val & LPA_1000MSFAIL) {
+		state = PORT_MODE_STATE_ERR;
+	} else if (phydev->link) {
+		/* this bits are valid only for active link */
+		if (val & LPA_1000MSRES)
+			state = PORT_MODE_STATE_MASTER;
+		else
+			state = PORT_MODE_STATE_SLAVE;
+	}
+
+	phydev->master_slave_get = FIELD_PREP(PORT_MODE_CFG_MASK, cfg) |
+		FIELD_PREP(PORT_MODE_STATE_MASK, state);
+
+	return 0;
+}
+
 /**
  * genphy_restart_aneg - Enable and Restart Autonegotiation
  * @phydev: target phy_device struct

@@ -1830,6 +1908,12 @@ int __genphy_config_aneg(struct phy_device *phydev, bool changed)
 	if (genphy_config_eee_advert(phydev))
 		changed = true;
 
+	err = genphy_setup_master_slave(phydev);
+	if (err < 0)
+		return err;
+	else if (err)
+		changed = true;
+
 	if (AUTONEG_ENABLE != phydev->autoneg)
 		return genphy_setup_forced(phydev);
 

@@ -2063,6 +2147,10 @@ int genphy_read_status(struct phy_device *phydev)
 	phydev->pause = 0;
 	phydev->asym_pause = 0;
 
+	err = genphy_read_master_slave(phydev);
+	if (err < 0)
+		return err;
+
 	err = genphy_read_lpa(phydev);
 	if (err < 0)
 		return err;

@@ -421,6 +421,8 @@ struct phy_device {
 	int duplex;
 	int pause;
 	int asym_pause;
+	u8 master_slave_get;
+	u8 master_slave_set;
 
 	/* Union of PHY and Attached devices' supported link modes */
 	/* See ethtool.h for more info */

@@ -1659,6 +1659,19 @@ static inline int ethtool_validate_duplex(__u8 duplex)
 	return 0;
 }
 
+/* Port mode */
+#define PORT_MODE_CFG_MASK		0x07
+#define PORT_MODE_CFG_UNKNOWN		0
+#define PORT_MODE_CFG_MASTER_PREFERRED	1
+#define PORT_MODE_CFG_SLAVE_PREFERRED	2
+#define PORT_MODE_CFG_MASTER_FORCE	3
+#define PORT_MODE_CFG_SLAVE_FORCE	4
+#define PORT_MODE_STATE_MASK		0x38
+#define PORT_MODE_STATE_UNKNOWN		0
+#define PORT_MODE_STATE_MASTER		1
+#define PORT_MODE_STATE_SLAVE		2
+#define PORT_MODE_STATE_ERR		3
+
 /* Which connector port. */
 #define PORT_TP			0x00
 #define PORT_AUI		0x01

@@ -1850,6 +1863,7 @@ enum ethtool_reset_flags {
  *	autonegotiation; 0 if unknown or not applicable.  Read-only.
  * @transceiver: Used to distinguish different possible PHY types,
  *	reported consistently by PHYLIB.  Read-only.
+ * @master_slave: Master or slave port mode.
  *
  * If autonegotiation is disabled, the speed and @duplex represent the
  * fixed link mode and are writable if the driver supports multiple

@@ -1897,7 +1911,8 @@ struct ethtool_link_settings {
 	__u8	eth_tp_mdix_ctrl;
 	__s8	link_mode_masks_nwords;
 	__u8	transceiver;
-	__u8	reserved1[3];
+	__u8	master_slave;
+	__u8	reserved1[2];
 	__u32	reserved[7];
 	__u32	link_mode_masks[0];
 	/* layout of link_mode_masks fields:

@@ -185,6 +185,7 @@ enum {
 	ETHTOOL_A_LINKMODES_PEER,		/* bitset */
 	ETHTOOL_A_LINKMODES_SPEED,		/* u32 */
 	ETHTOOL_A_LINKMODES_DUPLEX,		/* u8 */
+	ETHTOOL_A_LINKMODES_MASTER_SLAVE,	/* u8 */
 
 	/* add new constants above here */
 	__ETHTOOL_A_LINKMODES_CNT,

@@ -146,11 +146,13 @@
 /* 1000BASE-T Control register */
 #define ADVERTISE_1000FULL	0x0200  /* Advertise 1000BASE-T full duplex */
 #define ADVERTISE_1000HALF	0x0100  /* Advertise 1000BASE-T half duplex */
+#define CTL1000_PREFER_MASTER	0x0400  /* prefer to operate as master */
 #define CTL1000_AS_MASTER	0x0800
 #define CTL1000_ENABLE_MASTER	0x1000
 
 /* 1000BASE-T Status register */
 #define LPA_1000MSFAIL		0x8000	/* Master/Slave resolution failure */
+#define LPA_1000MSRES		0x4000	/* Master/Slave resolution status */
 #define LPA_1000LOCALRXOK	0x2000	/* Link partner local receiver status */
 #define LPA_1000REMRXOK		0x1000	/* Link partner remote receiver status */
 #define LPA_1000FULL		0x0800	/* Link partner 1000BASE-T full duplex */

@@ -27,6 +27,7 @@ linkmodes_get_policy[ETHTOOL_A_LINKMODES_MAX + 1] = {
 	[ETHTOOL_A_LINKMODES_PEER]		= { .type = NLA_REJECT },
 	[ETHTOOL_A_LINKMODES_SPEED]		= { .type = NLA_REJECT },
 	[ETHTOOL_A_LINKMODES_DUPLEX]		= { .type = NLA_REJECT },
+	[ETHTOOL_A_LINKMODES_MASTER_SLAVE]	= { .type = NLA_REJECT },
 };
 
 static int linkmodes_prepare_data(const struct ethnl_req_info *req_base,

@@ -69,6 +70,7 @@ static int linkmodes_reply_size(const struct ethnl_req_info *req_base,
 	len = nla_total_size(sizeof(u8)) /* LINKMODES_AUTONEG */
 		+ nla_total_size(sizeof(u32)) /* LINKMODES_SPEED */
 		+ nla_total_size(sizeof(u8)) /* LINKMODES_DUPLEX */
+		+ nla_total_size(sizeof(u8)) /* LINKMODES_MASTER_SLAVE */
 		+ 0;
 	ret = ethnl_bitset_size(ksettings->link_modes.advertising,
 				ksettings->link_modes.supported,

@@ -119,7 +121,9 @@ static int linkmodes_fill_reply(struct sk_buff *skb,
 	}
 
 	if (nla_put_u32(skb, ETHTOOL_A_LINKMODES_SPEED, lsettings->speed) ||
-	    nla_put_u8(skb, ETHTOOL_A_LINKMODES_DUPLEX, lsettings->duplex))
+	    nla_put_u8(skb, ETHTOOL_A_LINKMODES_DUPLEX, lsettings->duplex) ||
+	    nla_put_u8(skb, ETHTOOL_A_LINKMODES_MASTER_SLAVE,
+		       lsettings->master_slave))
 		return -EMSGSIZE;
 
 	return 0;

@@ -248,6 +252,7 @@ linkmodes_set_policy[ETHTOOL_A_LINKMODES_MAX + 1] = {
 	[ETHTOOL_A_LINKMODES_PEER]		= { .type = NLA_REJECT },
 	[ETHTOOL_A_LINKMODES_SPEED]		= { .type = NLA_U32 },
 	[ETHTOOL_A_LINKMODES_DUPLEX]		= { .type = NLA_U8 },
+	[ETHTOOL_A_LINKMODES_MASTER_SLAVE]	= { .type = NLA_U8 },
 };
 
 /* Set advertised link modes to all supported modes matching requested speed

@@ -310,6 +315,8 @@ static int ethnl_update_linkmodes(struct genl_info *info, struct nlattr **tb,
 			 mod);
 	ethnl_update_u8(&lsettings->duplex, tb[ETHTOOL_A_LINKMODES_DUPLEX],
 			mod);
+	ethnl_update_u8(&lsettings->master_slave,
+			tb[ETHTOOL_A_LINKMODES_MASTER_SLAVE], mod);
 
 	if (!tb[ETHTOOL_A_LINKMODES_OURS] && lsettings->autoneg &&
 	    (req_speed || req_duplex) &&