netdev - Re: [PATCH net-next 0/3] net: atlantic: phy tunables from mac driver

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Message-ID: <20200930001640.GB4012000@lunn.ch>
Date:   Wed, 30 Sep 2020 02:16:40 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Igor Russkikh <irusskikh@...vell.com>, netdev@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next 0/3] net: atlantic: phy tunables from mac driver

On Tue, Sep 29, 2020 at 05:09:48PM -0700, Jakub Kicinski wrote:
> On Tue, 29 Sep 2020 20:47:23 +0200 Andrew Lunn wrote:
> > > Do you mean report supported range via extack?  
> > 
> > Yes.
> > 
> > 811ac400ea33 ("net: phy: dp83869: Add speed optimization feature")
> > 
> > was merged recently. It has:
> > 
> > +       default:
> > +               phydev_err(phydev,
> > +                          "Downshift count must be 1, 2, 4 or 8\n");
> > +               return -EINVAL;
> > 
> > and there are more examples in PHY drivers where it would be good to
> > tell the uses what the valid values are. I guess most won't see this
> > kernel message, but if netlink ethtool printed:
> > 
> > Invalid Argument: Downshift count must be 1, 2, 4 or 8
> > 
> > it would be a lot more user friendly.
> 
> Ah, now I recall, we already discussed this.
> 
> FWIW we could provision for the extack and just pass NULL for now?
> Would that be too ugly?

If Michal does not have any code lying around in a drawer, what might
be a good idea. For the old IOCTL we will need to pass a NULL anyway.

  Andrew