linux-kernel - Re: [net-next PATCH v2 08/12] net: phy: at803x: move specific at8031 WOL bits to dedicated function

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Message-ID: <656f370f.050a0220.8c4c5.8d3f@mx.google.com>
Date:   Tue, 5 Dec 2023 15:43:24 +0100
From:   Christian Marangi <ansuelsmth@...il.com>
To:     Paolo Abeni <pabeni@...hat.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [net-next PATCH v2 08/12] net: phy: at803x: move specific at8031
 WOL bits to dedicated function

On Tue, Dec 05, 2023 at 10:32:55AM +0100, Paolo Abeni wrote:
> On Fri, 2023-12-01 at 01:14 +0100, Christian Marangi wrote:
> > Move specific at8031 WOL enable/disable to dedicated function to make
> > at803x_set_wol more generic.
> > 
> > This is needed in preparation for PHY driver split as qca8081 share the
> > same function to toggle WOL settings.
> > 
> > In this new implementation WOL module in at8031 is enabled after the
> > generic interrupt is setup. This should not cause any problem as the
> > WOL_INT has a separate implementation and only relay on MAC bits.
> > 
> > Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> > ---
> >  drivers/net/phy/at803x.c | 42 ++++++++++++++++++++++++----------------
> >  1 file changed, 25 insertions(+), 17 deletions(-)
> > 
> > diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
> > index 02ac71f98466..2de7a59c0faa 100644
> > --- a/drivers/net/phy/at803x.c
> > +++ b/drivers/net/phy/at803x.c
> > @@ -466,27 +466,11 @@ static int at803x_set_wol(struct phy_device *phydev,
> >  			phy_write_mmd(phydev, MDIO_MMD_PCS, offsets[i],
> >  				      mac[(i * 2) + 1] | (mac[(i * 2)] << 8));
> >  
> > -		/* Enable WOL function for 1588 */
> > -		if (phydev->drv->phy_id == ATH8031_PHY_ID) {
> > -			ret = phy_modify_mmd(phydev, MDIO_MMD_PCS,
> > -					     AT803X_PHY_MMD3_WOL_CTRL,
> > -					     0, AT803X_WOL_EN);
> > -			if (ret)
> > -				return ret;
> > -		}
> >  		/* Enable WOL interrupt */
> >  		ret = phy_modify(phydev, AT803X_INTR_ENABLE, 0, AT803X_INTR_ENABLE_WOL);
> >  		if (ret)
> >  			return ret;
> >  	} else {
> > -		/* Disable WoL function for 1588 */
> > -		if (phydev->drv->phy_id == ATH8031_PHY_ID) {
> > -			ret = phy_modify_mmd(phydev, MDIO_MMD_PCS,
> > -					     AT803X_PHY_MMD3_WOL_CTRL,
> > -					     AT803X_WOL_EN, 0);
> > -			if (ret)
> > -				return ret;
> > -		}
> >  		/* Disable WOL interrupt */
> >  		ret = phy_modify(phydev, AT803X_INTR_ENABLE, AT803X_INTR_ENABLE_WOL, 0);
> >  		if (ret)
> > @@ -1611,6 +1595,30 @@ static int at8031_config_init(struct phy_device *phydev)
> >  	return at803x_config_init(phydev);
> >  }
> >  
> > +static int at8031_set_wol(struct phy_device *phydev,
> > +			  struct ethtool_wolinfo *wol)
> > +{
> > +	int ret;
> > +
> > +	/* First setup MAC address and enable WOL interrupt */
> > +	ret = at803x_set_wol(phydev, wol);
> > +	if (ret)
> > +		return ret;
> > +
> > +	if (wol->wolopts & WAKE_MAGIC)
> > +		/* Enable WOL function for 1588 */
> > +		ret = phy_modify_mmd(phydev, MDIO_MMD_PCS,
> > +				     AT803X_PHY_MMD3_WOL_CTRL,
> > +				     0, AT803X_WOL_EN);
> > +	else
> > +		/* Disable WoL function for 1588 */
> > +		ret = phy_modify_mmd(phydev, MDIO_MMD_PCS,
> > +				     AT803X_PHY_MMD3_WOL_CTRL,
> > +				     AT803X_WOL_EN, 0);
> > +
> > +	return ret;
> 
> If I read correctly, the above changes the order of some WoL
> initialization steps: now WOL_CTRL is touched after
> AT803X_INTR_ENABLE_WOL. Is that correct?

Correct, as it was pointed out, in the previous revision the WOL was
enabled before setting the MAC leaving some timeframe where we had
interrupt that could be triggered by invalind MAC (and also in case MAC
setup was failing the WOL was laved enabled)

The current change should be safe enough as the WOL module is enabled at
the end of all the required setup preventing any kind of
misconfiguration if something fails before.

-- 
	Ansuel