netdev - [PATCH v3] net: mii: Report advertised link capabilities when autonegotiation is off

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Message-Id: <20201019120415.1416-1-l.stelmach@samsung.com>
Date:   Mon, 19 Oct 2020 14:04:15 +0200
From:   Łukasz Stelmach <l.stelmach@...sung.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Bartłomiej Żolnierkiewicz 
        <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Łukasz Stelmach <l.stelmach@...sung.com>
Subject: [PATCH v3] net: mii: Report advertised link capabilities when
 autonegotiation is off

Unify the set of information returned by mii_ethtool_get_link_ksettings(),
mii_ethtool_gset() and phy_ethtool_ksettings_get(). Make the mii_*()
functions report advertised settings when autonegotiation if disabled.

Suggested-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Łukasz Stelmach <l.stelmach@...sung.com>
---
This is the third version of ("net: phy: Prevent reporting advertised
modes when autoneg is off")  patch[1] that started as change for phy.c
to make phy_ethtool_ksettings_get() work like mii_*() below. After
suggestions from Russell King came v2[2].

Following Andrew Lunn's suggestions[2] to report advertised parameters even
when autonegotiation is off I decided to drop changes to phy.c and make
appropriate to mii.c

Changes in v3:
  - drop changes to phy.c
  - introduce changes to mii.c

Changes in v2:
  - clear lp_advertising
  - set ETHTOOL_LINK_MODE_TP_BIT and ETHTOOL_LINK_MODE_MII_BIT in advertising

[1] https://lore.kernel.org/lkml/20201014125650.12137-1-l.stelmach@samsung.com/ 
[2] https://lore.kernel.org/lkml/20201015084435.24368-1-l.stelmach@samsung.com/

 drivers/net/mii.c | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/net/mii.c b/drivers/net/mii.c
index f6a97c859f3a..e71ebb933266 100644
--- a/drivers/net/mii.c
+++ b/drivers/net/mii.c
@@ -84,15 +84,16 @@ int mii_ethtool_gset(struct mii_if_info *mii, struct ethtool_cmd *ecmd)
  		ctrl1000 = mii->mdio_read(dev, mii->phy_id, MII_CTRL1000);
 		stat1000 = mii->mdio_read(dev, mii->phy_id, MII_STAT1000);
 	}
+
+	ecmd->advertising |= mii_get_an(mii, MII_ADVERTISE);
+	if (mii->supports_gmii)
+		ecmd->advertising |=
+			mii_ctrl1000_to_ethtool_adv_t(ctrl1000);
+
 	if (bmcr & BMCR_ANENABLE) {
 		ecmd->advertising |= ADVERTISED_Autoneg;
 		ecmd->autoneg = AUTONEG_ENABLE;
 
-		ecmd->advertising |= mii_get_an(mii, MII_ADVERTISE);
-		if (mii->supports_gmii)
-			ecmd->advertising |=
-					mii_ctrl1000_to_ethtool_adv_t(ctrl1000);
-
 		if (bmsr & BMSR_ANEGCOMPLETE) {
 			ecmd->lp_advertising = mii_get_an(mii, MII_LPA);
 			ecmd->lp_advertising |=
@@ -171,14 +172,15 @@ void mii_ethtool_get_link_ksettings(struct mii_if_info *mii,
 		ctrl1000 = mii->mdio_read(dev, mii->phy_id, MII_CTRL1000);
 		stat1000 = mii->mdio_read(dev, mii->phy_id, MII_STAT1000);
 	}
+
+	advertising |= mii_get_an(mii, MII_ADVERTISE);
+	if (mii->supports_gmii)
+		advertising |= mii_ctrl1000_to_ethtool_adv_t(ctrl1000);
+
 	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 |=
-- 
2.26.2