linux-kernel - Re: [RFT PATCH net] net: phy: aquantia: only poll GLOBAL

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <172163883154.3798.5139161262655916040@kwain.local>
Date: Mon, 22 Jul 2024 11:00:31 +0200
From: Antoine Tenart <atenart@...nel.org>
To: Andrew Lunn <andrew@...n.ch>, Bartosz Golaszewski <brgl@...ev.pl>, David S . Miller <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Heiner Kallweit <hkallweit1@...il.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Russell King <linux@...linux.org.uk>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, Jon Hunter <jonathanh@...dia.com>
Subject: Re: [RFT PATCH net] net: phy: aquantia: only poll GLOBAL_CFG registers on aqr113c and aqr115c

Quoting Bartosz Golaszewski (2024-07-18 16:57:47)
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> Commit 708405f3e56e ("net: phy: aquantia: wait for the GLOBAL_CFG to
> start returning real values") introduced a workaround for an issue
> observed on aqr115c. However there were never any reports of it
> happening on other models and the workaround has been reported to cause
> and issue on aqr113c (and it may cause the same on any other model not
> supporting 10M mode).
> 
> Let's limit the impact of the workaround to aqr113c and aqr115c and poll
> the 100M GLOBAL_CFG register instead as both models are known to support
> it correctly.
> 
> Reported-by: Jon Hunter <jonathanh@...dia.com>
> Closes: https://lore.kernel.org/lkml/7c0140be-4325-4005-9068-7e0fc5ff344d@nvidia.com/
> Fixes: 708405f3e56e ("net: phy: aquantia: wait for the GLOBAL_CFG to start returning real values")
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
>  drivers/net/phy/aquantia/aquantia_main.c | 29 +++++++++++++++++-------
>  1 file changed, 21 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/phy/aquantia/aquantia_main.c b/drivers/net/phy/aquantia/aquantia_main.c
> index d12e35374231..6e3e0fc6ea27 100644
> --- a/drivers/net/phy/aquantia/aquantia_main.c
> +++ b/drivers/net/phy/aquantia/aquantia_main.c
> @@ -653,13 +653,7 @@ static int aqr107_fill_interface_modes(struct phy_device *phydev)
>         unsigned long *possible = phydev->possible_interfaces;
>         unsigned int serdes_mode, rate_adapt;
>         phy_interface_t interface;
> -       int i, val, ret;
> -
> -       ret = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
> -                                       VEND1_GLOBAL_CFG_10M, val, val != 0,
> -                                       1000, 100000, false);
> -       if (ret)
> -               return ret;
> +       int i, val;
>  
>         /* Walk the media-speed configuration registers to determine which
>          * host-side serdes modes may be used by the PHY depending on the
> @@ -708,6 +702,25 @@ static int aqr107_fill_interface_modes(struct phy_device *phydev)
>         return 0;
>  }
>  
> +static int aqr113c_fill_interface_modes(struct phy_device *phydev)
> +{
> +       int val, ret;
> +
> +       /* It's been observed on some models that - when coming out of suspend
> +        * - the FW signals that the PHY is ready but the GLOBAL_CFG registers
> +        * continue on returning zeroes for some time. Let's poll the 10M

nit: 100M?

> +        * register until it returns a real value as both 113c and 115c support
> +        * this mode.
> +        */
> +       ret = phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
> +                                       VEND1_GLOBAL_CFG_100M, val, val != 0,
> +                                       1000, 100000, false);
> +       if (ret)
> +               return ret;
> +
> +       return aqr107_fill_interface_modes(phydev);
> +}
> +
>  static int aqr113c_config_init(struct phy_device *phydev)
>  {
>         int ret;
> @@ -725,7 +738,7 @@ static int aqr113c_config_init(struct phy_device *phydev)
>         if (ret)
>                 return ret;
>  
> -       return aqr107_fill_interface_modes(phydev);
> +       return aqr113c_fill_interface_modes(phydev);
>  }
>  
>  static int aqr107_probe(struct phy_device *phydev)
> -- 
> 2.43.0
> 
>