netdev - Re: [PATCH net-next 4/5] net: phylink: pcs: add 802.3 clause 22 helpers

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Date:   Wed, 11 Mar 2020 20:32:45 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 4/5] net: phylink: pcs: add 802.3 clause 22
 helpers

On Wed, Mar 11, 2020 at 09:59:18PM +0200, Vladimir Oltean wrote:
> On Wed, 11 Mar 2020 at 21:32, Russell King - ARM Linux admin
> <linux@...linux.org.uk> wrote:
> > So, why abuse some other subsystem's datastructure for something that
> > is entirely separate, potentially making the maintanence of that
> > subsystem more difficult for the maintainers?  I don't get why one
> > would think this is an acceptable approach.
> >
> > What you've said is that you want to use struct phy_device, but you
> > don't want to publish it into the device model, you don't want to
> > use mdio accesses, you don't want to use phylib helpers.  So, what's
> > the point of using struct phy_device?  I don't see _any_ reason to
> > do that and make things unnecessarily more difficult for the phylib
> > maintainers.
> >
> 
> So if it's such a big mistake...
> 
> > > > Sorry, but you need to explain better what you would like to see here.
> > > > The additions I'm adding are to the SGMII specification; I find your
> > > > existing definitions to be obscure because they conflate two different
> > > > bit fields together to produce something for the ethtool linkmodes
> > > > (which I think is a big mistake.)
> > >
> > > I'm saying that there were already LPA_SGMII definitions in there.
> > > There are 2 "generic" solutions proposed now and yet they cannot agree
> > > on config_reg definitions. Omitting the fact that you did have a
> > > chance to point out that big mistake before it got merged, I'm
> > > wondering why you didn't remove them and add your new ones instead.
> > > The code rework is minimal. Is it because the definitions are in UAPI?
> > > If so, isn't it an even bigger mistake to put more stuff in UAPI? Why
> > > would user space care about the SGMII config_reg? There's no user even
> > > of the previous SGMII definitions as far as I can tell.
> >
> > I don't see it as a big deal - certainly not the kind of fuss you're
> > making over it.
> >
> 
> ...why keep it?
> I'm all for creating a common interface for configuring this. It just
> makes me wonder how common it is going to be, if there's already a
> driver in-tree, from the same PCS hardware vendor, which after the
> patchset you're proposing is still going to use a different
> infrastructure.

Do you see any reason why felix_vsc9959 couldn't make use of the code
I'm proposing?

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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