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

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Message-ID: <1462666385.2634.1.camel@decadent.org.uk>
Date:	Sun, 08 May 2016 01:13:05 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Philippe Reynes <tremyfr@...il.com>
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 Sun, 2016-05-08 at 00:56 +0200, Philippe Reynes 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 ?

Maybe just because no-one bothered to update them after it was added to
net_device.

Ben.

> 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.

-- 
Ben Hutchings
I haven't lost my mind; it's backed up on tape somewhere.
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