linux-kernel - Re: [PATCH net-next 1/1] Add genphy_c45_config

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Date:   Mon, 19 Aug 2019 21:51:40 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Marco Hartmann <marco.hartmann@....com>,
        Christian Herber <christian.herber@....com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 1/1] Add genphy_c45_config_aneg() function to
 phy-c45.c

On 19.08.2019 19:52, Marco Hartmann wrote:
> and call it from phy_config_aneg().
> 
Here something went wrong.

> commit 34786005eca3 ("net: phy: prevent PHYs w/o Clause 22 regs from
> calling genphy_config_aneg") introduced a check that aborts
> phy_config_aneg() if the phy is a C45 phy.
> This causes phy_state_machine() to call phy_error() so that the phy
> ends up in PHY_HALTED state.
> 
> Instead of returning -EOPNOTSUPP, call genphy_c45_config_aneg()
> (analogous to the C22 case) so that the state machine can run
> correctly.
> 
> genphy_c45_config_aneg() closely resembles mv3310_config_aneg()
> in drivers/net/phy/marvell10g.c, excluding vendor specific
> configurations for 1000BaseT.
> 
> Fixes: 34786005eca3 ("net: phy: prevent PHYs w/o Clause 22 regs from
> calling genphy_config_aneg")
> 
This tag seems to be the wrong one. This change was done before
genphy_c45_driver was added. Most likely tag should be:
22b56e827093 ("net: phy: replace genphy_10g_driver with genphy_c45_driver")
And because it's a fix applying to previous kernel versions it should
be annotated "net", not "net-next".

> Signed-off-by: Marco Hartmann <marco.hartmann@....com>
> ---
>  drivers/net/phy/phy-c45.c | 26 ++++++++++++++++++++++++++
>  drivers/net/phy/phy.c     |  2 +-
>  include/linux/phy.h       |  1 +
>  3 files changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/phy-c45.c b/drivers/net/phy/phy-c45.c
> index b9d4145781ca..fa9062fd9122 100644
> --- a/drivers/net/phy/phy-c45.c
> +++ b/drivers/net/phy/phy-c45.c
> @@ -509,6 +509,32 @@ int genphy_c45_read_status(struct phy_device *phydev)
>  }
>  EXPORT_SYMBOL_GPL(genphy_c45_read_status);
>  
> +/**
> + * genphy_c45_config_aneg - restart auto-negotiation or forced setup
> + * @phydev: target phy_device struct
> + *
> + * Description: If auto-negotiation is enabled, we configure the
> + *   advertising, and then restart auto-negotiation.  If it is not
> + *   enabled, then we force a configuration.
> + */
> +int genphy_c45_config_aneg(struct phy_device *phydev)
> +{
> +	int ret;
> +	bool changed = false;

Reverse xmas tree please.

> [...]

Overall looks good to me. For a single patch you don't have to provide
a cover letter.