linux-kernel - Re: [PATCH 1/2] net: phy: add ethtool_phy_{get|set}_link

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Date:	Sun, 08 May 2016 11:19:25 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Philippe Reynes <tremyfr@...il.com>,
	Ben Hutchings <ben@...adent.org.uk>
CC:	fugang.duan@....com, davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] net: phy: add ethtool_phy_{get|set}_link_ksettings

On May 7, 2016 3:56:34 PM PDT, Philippe Reynes <tremyfr@...il.com> wrote:
>On 07/05/16 13:59, Ben Hutchings wrote:
>> On Sat, 2016-05-07 at 01:18 +0200, Philippe Reynes wrote:
>>> The callback {get|set}_link_ksettings are often defined
>>> in a very close way. There are mainly two differences in
>>> those callback:
>>> - the name of the netdev private structure
>>> - the name of the struct phydev in the private structure
>>>
>>> We add two defines ethtool_phy_{get|set}_link_ksettings
>>> to avoid writing severals times almost the same function.
>> [...]
>>
>> I don't think there's no need to access a private structure, as
>there's
>> a phydev pointer in struct net_device.  If some drivers don't
>maintain
>> that pointer, they should be changed to do so.  Then they can
>> use generic implementations of {get,set}_link_ksettings provided by
>> phylib.
>
>If we could use the phydev in the struct net_device, we could write a
>generic function for {get|set}_link_ksettings. It's a good idea.
>
>But I've quickly looked and a lot of ethernet driver use the private
>structure to store the phydev. If the ethernet driver may use the
>struct net_device for phydev, do you know why so many drivers use
>the private structure ?

The introduction of a phy_device pointer in net_device came much later than the introduction and use of PHYLIB by most drivers so it is probably just an oversight.

>
>If everybody agree, I can send a new version with a generic
>{get|set}_link_ksettings
>and a update of fec to use the phydev store in the structure
>net_device.

Yes, that sounds very reasonable. It might be possible to cook a coccinelle patch which replaces the use of a private phy_device pointer and utilize the one from net_device.

-- 
Florian