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SubjectRe: [PATCH 1/3] net: ethernet: add support for PCS and 2.5G speed
>  	/* mask with MAC supported features */
> - if (macb_is_gem(bp) && bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE)
> - phy_set_max_speed(phydev, SPEED_1000);
> - else
> - phy_set_max_speed(phydev, SPEED_100);
> + if (macb_is_gem(bp)) {
> + linkmode_copy(phydev->supported, PHY_GBIT_FEATURES);
> + if (bp->caps & MACB_CAPS_TWO_PT_FIVE_GIG_SPEED)
> + linkmode_set_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
> + phydev->supported);
> + } else {
> + linkmode_copy(phydev->supported, PHY_BASIC_FEATURES);
> + }
> +
> + linkmode_copy(phydev->advertising, phydev->supported);

This is not correct. Just because the MAC can do 2.5G does not mean
the PHY can. So you should not be adding links modes. Also, somebody
might be using a PHY that can do 2.5G with a MAC which can only do 1G.

The correct thing to do is call phy_set_max_speed() with the maximum
speed the MAC can do.

Andrew

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