netdev - Re: [PATCH net] net: phylink: actually fix ksettings

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Message-ID: <20230605053400.GA273955@raju-project-pc>
Date: Mon, 5 Jun 2023 11:04:00 +0530
From: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
To: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
CC: Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>,
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	<netdev@...r.kernel.org>
Subject: Re: [PATCH net] net: phylink: actually fix ksettings_set() ethtool
 call

The 06/01/2023 10:12, Russell King (Oracle) wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Raju Lakkaraju reported that the below commit caused a regression
> with Lan743x drivers and a 2.5G SFP. Sadly, this is because the commit
> was utterly wrong. Let's fix this properly by not moving the
> linkmode_and(), but instead copying the link ksettings and then
> modifying the advertising mask before passing the modified link
> ksettings to phylib.
> 
> Fixes: df0acdc59b09 ("net: phylink: fix ksettings_set() ethtool call")
> Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> ---
> Raju,
> 
> Given the number of cockups I've made with this so far, it would be a
> really good idea if you can explicitly test this patch and provide a
> tested-by. Also it would be good to have a reported-by as well.

Tested this patch with 1G Speed Cu SFP (Axcen Photonics - AXGT-R1T4-05I1) with
different speeds (1G/100M/10M bps) changes.. Working as expected.

Tested-by: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>
Reported-by: Raju Lakkaraju <Raju.Lakkaraju@...rochip.com>

Thanks,
Raju
> 
> Thanks.
> 
>  drivers/net/phy/phylink.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
> index e237949deee6..b4831110003c 100644
> --- a/drivers/net/phy/phylink.c
> +++ b/drivers/net/phy/phylink.c
> @@ -2225,11 +2225,13 @@ int phylink_ethtool_ksettings_set(struct phylink *pl,
> 
>         ASSERT_RTNL();
> 
> -       /* Mask out unsupported advertisements */
> -       linkmode_and(config.advertising, kset->link_modes.advertising,
> -                    pl->supported);
> -
>         if (pl->phydev) {
> +               struct ethtool_link_ksettings phy_kset = *kset;
> +
> +               linkmode_and(phy_kset.link_modes.advertising,
> +                            phy_kset.link_modes.advertising,
> +                            pl->supported);
> +
>                 /* We can rely on phylib for this update; we also do not need
>                  * to update the pl->link_config settings:
>                  * - the configuration returned via ksettings_get() will come
> @@ -2248,10 +2250,13 @@ int phylink_ethtool_ksettings_set(struct phylink *pl,
>                  *   the presence of a PHY, this should not be changed as that
>                  *   should be determined from the media side advertisement.
>                  */
> -               return phy_ethtool_ksettings_set(pl->phydev, kset);
> +               return phy_ethtool_ksettings_set(pl->phydev, &phy_kset);
>         }
> 
>         config = pl->link_config;
> +       /* Mask out unsupported advertisements */
> +       linkmode_and(config.advertising, kset->link_modes.advertising,
> +                    pl->supported);
> 
>         /* FIXME: should we reject autoneg if phy/mac does not support it? */
>         switch (kset->base.autoneg) {
> --
> 2.30.2
>