netdev - RE: [PATCH v2 2/2] dpaa_eth: support all modes with rate adapting PHYs

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Date:   Mon, 27 Jan 2020 15:49:42 +0000
From:   "Madalin Bucur (OSS)" <madalin.bucur@....nxp.com>
To:     Vladimir Oltean <olteanv@...il.com>,
        "Madalin Bucur (OSS)" <madalin.bucur@....nxp.com>
CC:     "David S. Miller" <davem@...emloft.net>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        netdev <netdev@...r.kernel.org>,
        "ykaukab@...e.de" <ykaukab@...e.de>
Subject: RE: [PATCH v2 2/2] dpaa_eth: support all modes with rate adapting
 PHYs

> -----Original Message-----
> From: Vladimir Oltean <olteanv@...il.com>
> Sent: Monday, January 27, 2020 5:31 PM
> To: Madalin Bucur (OSS) <madalin.bucur@....nxp.com>
> Cc: David S. Miller <davem@...emloft.net>; Andrew Lunn <andrew@...n.ch>;
> Florian Fainelli <f.fainelli@...il.com>; Heiner Kallweit
> <hkallweit1@...il.com>; netdev <netdev@...r.kernel.org>; ykaukab@...e.de
> Subject: Re: [PATCH v2 2/2] dpaa_eth: support all modes with rate adapting
> PHYs
> 
> Hi Madalin,
> 
> On Mon, 27 Jan 2020 at 17:08, Madalin Bucur <madalin.bucur@....nxp.com>
> wrote:
> >
> > Stop removing modes that are not supported on the system interface
> > when the connected PHY is capable of rate adaptation. This addresses
> > an issue with the LS1046ARDB board 10G interface no longer working
> > with an 1G link partner after autonegotiation support was added
> > for the Aquantia PHY on board in
> >
> > commit 09c4c57f7bc4 ("net: phy: aquantia: add support for auto-
> negotiation configuration")
> >
> > Before this commit the values advertised by the PHY were not
> > influenced by the dpaa_eth driver removal of system-side unsupported
> > modes as the aqr_config_aneg() was basically a no-op. After this
> > commit, the modes removed by the dpaa_eth driver were no longer
> > advertised thus autonegotiation with 1G link partners failed.
> >
> > Reported-by: Mian Yousaf Kaukab <ykaukab@...e.de>
> > Signed-off-by: Madalin Bucur <madalin.bucur@....nxp.com>
> > ---
> >  drivers/net/ethernet/freescale/dpaa/dpaa_eth.c | 10 +++++++---
> >  1 file changed, 7 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> > index a301f0095223..d3eb235450e5 100644
> > --- a/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> > +++ b/drivers/net/ethernet/freescale/dpaa/dpaa_eth.c
> > @@ -2471,9 +2471,13 @@ static int dpaa_phy_init(struct net_device
> *net_dev)
> >                 return -ENODEV;
> >         }
> >
> > -       /* Remove any features not supported by the controller */
> > -       ethtool_convert_legacy_u32_to_link_mode(mask, mac_dev-
> >if_support);
> > -       linkmode_and(phy_dev->supported, phy_dev->supported, mask);
> > +       if (mac_dev->phy_if != PHY_INTERFACE_MODE_XGMII ||
> > +           !phy_dev->rate_adaptation) {
> > +               /* Remove any features not supported by the controller
> */
> > +               ethtool_convert_legacy_u32_to_link_mode(mask,
> > +                                                       mac_dev-
> >if_support);
> > +               linkmode_and(phy_dev->supported, phy_dev->supported,
> mask);
> > +       }
> 
> Is this sufficient?
> I suppose this works because you have flow control enabled by default?
> What would happen if the user would disable flow control with ethtool?

User misconfiguration is not something I'd try to prevent from driver code...

> >
> >         phy_support_asym_pause(phy_dev);
> >
> > --
> > 2.1.0
> >
> 
> Regards,
> -Vladimir