ethtool/mdio: Report MDIO mode support and link partner advertising

Add mdio_support and lp_advertising fields to ethtool_cmd.  Set these
in mdio45_ethtool_gset{,_npage}().
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/mdio.c

@@ -173,6 +173,8 @@ void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
 
 	ecmd->transceiver = XCVR_INTERNAL;
 	ecmd->phy_address = mdio->prtad;
+	ecmd->mdio_support =
+		mdio->mode_support & (MDIO_SUPPORTS_C45 | MDIO_SUPPORTS_C22);
 
 	reg = mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_PMAPMD,
 			      MDIO_CTRL2);
@@ -235,16 +237,19 @@ void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
 
 	if (ecmd->autoneg) {
 		u32 modes = 0;
+		int an_stat = mdio->mdio_read(mdio->dev, mdio->prtad,
+					      MDIO_MMD_AN, MDIO_STAT1);
 
 		/* If AN is complete and successful, report best common
 		 * mode, otherwise report best advertised mode. */
-		if (mdio->mdio_read(mdio->dev, mdio->prtad, MDIO_MMD_AN,
-				    MDIO_STAT1) &
-		    MDIO_AN_STAT1_COMPLETE)
-			modes = (ecmd->advertising &
-				 (mdio45_get_an(mdio, MDIO_AN_LPA) |
-				  npage_lpa));
-		if (modes == 0)
+		if (an_stat & MDIO_AN_STAT1_COMPLETE) {
+			ecmd->lp_advertising =
+				mdio45_get_an(mdio, MDIO_AN_LPA) | npage_lpa;
+			if (an_stat & MDIO_AN_STAT1_LPABLE)
+				ecmd->lp_advertising |= ADVERTISED_Autoneg;
+			modes = ecmd->advertising & ecmd->lp_advertising;
+		}
+		if ((modes & ~ADVERTISED_Autoneg) == 0)
 			modes = ecmd->advertising;
 
 		if (modes & ADVERTISED_10000baseT_Full) {

include/linux/ethtool.h

@@ -26,11 +26,13 @@ struct ethtool_cmd {
 	__u8	phy_address;
 	__u8	transceiver;	/* Which transceiver to use */
 	__u8	autoneg;	/* Enable or disable autonegotiation */
+	__u8	mdio_support;
 	__u32	maxtxpkt;	/* Tx pkts before generating tx int */
 	__u32	maxrxpkt;	/* Rx pkts before generating rx int */
 	__u16	speed_hi;
 	__u16	reserved2;
-	__u32	reserved[3];
+	__u32	lp_advertising;	/* Features the link partner advertises */
+	__u32	reserved[2];
 };
 
 static inline void ethtool_cmd_speed_set(struct ethtool_cmd *ep,

include/linux/mdio.h

@@ -234,6 +234,9 @@ static inline __u16 mdio_phy_id_devad(int phy_id)
 	return phy_id & MDIO_PHY_ID_DEVAD;
 }
 
+#define MDIO_SUPPORTS_C22		1
+#define MDIO_SUPPORTS_C45		2
+
 #ifdef __KERNEL__ 
 
 /**
@@ -264,8 +267,6 @@ struct mdio_if_info {
 
 #define MDIO_PRTAD_NONE			(-1)
 #define MDIO_DEVAD_NONE			(-1)
-#define MDIO_SUPPORTS_C22		1
-#define MDIO_SUPPORTS_C45		2
 #define MDIO_EMULATE_C22		4
 
 struct ethtool_cmd;