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

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Date:	Sun, 08 May 2016 00:56:34 +0200
From:	Philippe Reynes <tremyfr@...il.com>
To:	Ben Hutchings <ben@...adent.org.uk>
CC:	f.fainelli@...il.com, 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 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 ?

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.

Philippe