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

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Date:   Tue, 29 Sep 2020 17:09:48 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
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, 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?