linux-kernel - Re: [PATCH net-next v2 3/3] net: dp83869: Add speed optimization feature

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Date:   Thu, 3 Sep 2020 06:05:06 -0500
From:   Dan Murphy <dmurphy@...com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     <davem@...emloft.net>, <andrew@...n.ch>, <f.fainelli@...il.com>,
        <hkallweit1@...il.com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v2 3/3] net: dp83869: Add speed optimization
 feature

Jakub

On 9/2/20 9:06 PM, Jakub Kicinski wrote:
> On Wed, 2 Sep 2020 15:34:44 -0500 Dan Murphy wrote:
>> Set the speed optimization bit on the DP83869 PHY.
>>
>> Speed optimization, also known as link downshift, enables fallback to 100M
>> operation after multiple consecutive failed attempts at Gigabit link
>> establishment. Such a case could occur if cabling with only four wires
>> (two twisted pairs) were connected instead of the standard cabling with
>> eight wires (four twisted pairs).
>>
>> The number of failed link attempts before falling back to 100M operation is
>> configurable. By default, four failed link attempts are required before
>> falling back to 100M.
>>
>> Signed-off-by: Dan Murphy <dmurphy@...com>
> there seems to be lots of checkpatch warnings here:
>
> ERROR: switch and case should be at the same indent
> #111: FILE: drivers/net/phy/dp83869.c:342:
> +	switch (cnt) {
> +		case DP83869_DOWNSHIFT_1_COUNT:
> [...]
> +		case DP83869_DOWNSHIFT_2_COUNT:
> [...]
> +		case DP83869_DOWNSHIFT_4_COUNT:
> [...]
> +		case DP83869_DOWNSHIFT_8_COUNT:
> [...]
> +		default:
>
> CHECK: Alignment should match open parenthesis
> #139: FILE: drivers/net/phy/dp83869.c:370:
> +static int dp83869_get_tunable(struct phy_device *phydev,
> +				struct ethtool_tunable *tuna, void *data)
>
> CHECK: Alignment should match open parenthesis
> #150: FILE: drivers/net/phy/dp83869.c:381:
> +static int dp83869_set_tunable(struct phy_device *phydev,
> +				struct ethtool_tunable *tuna, const void *data)
>
> WARNING: please, no spaces at the start of a line
> #168: FILE: drivers/net/phy/dp83869.c:669:
> +       ret = phy_modify(phydev, DP83869_CFG2, DP83869_DOWNSHIFT_EN,$
>
> ERROR: code indent should use tabs where possible
> #169: FILE: drivers/net/phy/dp83869.c:670:
> +                        DP83869_DOWNSHIFT_EN);$
>
> WARNING: please, no spaces at the start of a line
> #169: FILE: drivers/net/phy/dp83869.c:670:
> +                        DP83869_DOWNSHIFT_EN);$
>
> WARNING: please, no spaces at the start of a line
> #170: FILE: drivers/net/phy/dp83869.c:671:
> +       if (ret)$
>
> WARNING: suspect code indent for conditional statements (7, 15)
> #170: FILE: drivers/net/phy/dp83869.c:671:
> +       if (ret)
> +               return ret;
>
> ERROR: code indent should use tabs where possible
> #171: FILE: drivers/net/phy/dp83869.c:672:
> +               return ret;$
>
> WARNING: please, no spaces at the start of a line
> #171: FILE: drivers/net/phy/dp83869.c:672:
> +               return ret;$
>
> total: 3 errors, 5 warnings, 2 checks, 152 lines checked

I will fix these.

Dan