Commit 83ea067f authored Mar 31, 2017 by Russell King Committed by David S. Miller Apr 01, 2017

net: phy: avoid setting unsupported EEE advertisments



We currently allow userspace to set any EEE advertisments it desires,
whether or not the PHY supports them.  For example:

 # ethtool --set-eee eth1 advertise 0xffffffff
 # ethtool --show-eee eth1
 EEE Settings for eth1:
        EEE status: disabled
        Tx LPI: disabled
        Supported EEE link modes:  100baseT/Full
                                   1000baseT/Full
                                   10000baseT/Full
        Advertised EEE link modes:  100baseT/Full
                                    1000baseT/Full
                                    1000baseKX/Full
                                    10000baseT/Full
                                    10000baseKX4/Full
                                    10000baseKR/Full

Clearly, this is not sane, we should only allow link modes that are
supported to be advertised (as we do elsewhere.)  Ensure that we mask
the MDIO_AN_EEE_ADV value with the capabilities retrieved from the
MDIO_PCS_EEE_ABLE register.

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent eefe06e8

drivers/net/phy/phy.c

+10 −5

Original line number	Diff line number	Diff line
		@@ -1332,17 +1332,22 @@ EXPORT_SYMBOL(phy_ethtool_get_eee);
		*/
		int phy_ethtool_set_eee(struct phy_device phydev, struct ethtool_eee data)
		{
		int val = ethtool_adv_to_mmd_eee_adv_t(data->advertised);
		int cap, adv;

		if (!phydev->drv)
		return -EIO;

		/* Mask prohibited EEE modes */
		val &= ~phydev->eee_broken_modes;
		/* Get Supported EEE */
		cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE);
		if (cap < 0)
		return cap;

		phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, val);
		adv = ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap;

		return 0;
		/* Mask prohibited EEE modes */
		adv &= ~phydev->eee_broken_modes;

		return phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
		}
		EXPORT_SYMBOL(phy_ethtool_set_eee);