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

[Łukasz Stelmach]

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 <and...@lunn.ch>
Signed-off-by: Łukasz Stelmach <l.stelm...@samsung.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.stelm...@samsung.com/ 
[2] https://lore.kernel.org/lkml/20201015084435.24368-1-l.stelm...@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