linux-kernel - Re: [PATCH v1 1/2] modpost: file2alias: fixup mdio alias garbled code in modules.alias

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Date:   Tue, 23 Nov 2021 12:58:29 +0800
From:   zhuyinbo <zhuyinbo@...ngson.cn>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Heiner Kallweit <hkallweit1@...il.com>, linux@...linux.org.uk,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org, zhuyinbo@...ngson.cn,
        davem@...emloft.net, kuba@...nel.org, masahiroy@...nel.org,
        michal.lkml@...kovi.net, ndesaulniers@...gle.com,
        netdev@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] modpost: file2alias: fixup mdio alias garbled code
 in modules.alias


在 2021/11/23 下午12:12, Andrew Lunn 写道:
> On Tue, Nov 23, 2021 at 09:33:03AM +0800, zhuyinbo wrote:
>> 在 2021/11/22 下午10:07, Andrew Lunn 写道:
>>
>>      On Mon, Nov 22, 2021 at 08:14:57PM +0800, Yinbo Zhu wrote:
>>
>>          After module compilation, module alias mechanism will generate a ugly
>>          mdio modules alias configure if ethernet phy was selected, this patch
>>          is to fixup mdio alias garbled code.
>>
>>          In addition, that ugly alias configure will cause ethernet phy module
>>          doens't match udev, phy module auto-load is fail, but add this patch
>>          that it is well mdio driver alias configure match phy device uevent.
>>
>>      What PHY do you have problems with? What is the PHY id and which
>>      driver should be loaded.
>>
>>      This code has existed a long time, so suddenly saying it is wrong and
>>      changing it needs a good explanation why it is wrong. Being ugly is
>>      not a good reason.
>>
>>          Andrew
>>
>> Hi Andrew,
>>
>>      Use default mdio configure, After module compilation, mdio alias configure
>> is following and it doesn't match
>>
>>      the match phy dev(mdio dev)  uevent, because the mdio alias configure
>> "0000000101000001000011111001????"  include "?" and
> A PHY ID generally break up into 3 parts.
>
> The OUI of the manufacture.
> The device.
> The revision
>
> The ? means these bits don't matter. Those correspond to the
> revision. Generally, a driver can driver any revision of the PHY,
> which is why those bits don't matter.
>
> So when a driver probes with the id 00000001010000010000111110010110
> we expect user space to find the best match, performing wildcard
> expansion. So the ? will match anything.
>
> Since this is worked for a long time, do you have an example where it
> is broken? If so, which PHY driver? If it is broken, no driver is
> loaded, or the wrong driver is loaded, i expect it is a bug in a
> specific driver. And we should fix that bug in the specific driver.
>
>       Andrew

Hi Andrew,

The string like "0000000101000001000011111001????" dont't match any mdio driver, and i said it include "? that "?" doesn't match any driver, in addition that include Binary digit
like "0000000101000001000011111001", that binary digit doesn't match any driver, that should use Hexadecimal for phy id, and I test on some platform, not only a platform, it isn't some
specifi driver issue, it is gerneral issue. please you note.  that phy driver match phy device must use whole string "MODALIAS=xxxyyzz", not partial match.