netdev - Re: [RFC PATCH net-next v2 10/17] ethtool: implement GET

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Message-ID: <20180821141022.GD2985@lunn.ch>
Date:   Tue, 21 Aug 2018 16:10:22 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Michal Kubecek <mkubecek@...e.cz>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Pirko <jiri@...nulli.us>,
        David Miller <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        Jakub Kicinski <kubakici@...pl>,
        "John W. Linville" <linville@...driver.com>
Subject: Re: [RFC PATCH net-next v2 10/17] ethtool: implement GET_SETTINGS
 message

On Tue, Aug 21, 2018 at 11:32:46AM +0200, Michal Kubecek wrote:
> On Mon, Jul 30, 2018 at 08:54:55PM +0200, Andrew Lunn wrote:
> > > +/* Internal kernel helper to query a device ethtool_link_settings.
> > > + *
> > > + * Backward compatibility note: for compatibility with legacy drivers
> > > + * that implement only the ethtool_cmd API, this has to work with both
> > > + * drivers implementing get_link_ksettings API and drivers
> > > + * implementing get_settings API. When drivers implement get_settings
> > > + * and report ethtool_cmd deprecated fields
> > > + * (transceiver/maxrxpkt/maxtxpkt), these fields are silently ignored
> > > + * because the resulting struct ethtool_link_settings does not report them.
> > 
> > ~/linux/drivers$ grep -r [.]get_settings *
> > net/ethernet/8390/etherh.c:		 .get_settings	= etherh_get_settings,
> > 
> > I don't think it is worth adding support for .get_settings for just
> > one driver. It is better to just convert that driver to the new API.
> 
> I have prepared a patch converting 8390/etherh driver to use
> {g,s}et_link_ksettings and I'm going to submit it when net-next opens.
> Do you think we can then drop {g,s}et_settings callbacks completely
> (i.e. also from ioctl() code and ethtool_ops)?  Do we care about
> unconverted out of tree drivers?

Hi Michal

We cannot break ethtool, the ABI it uses. But there is already code to
use get_link_ksettings() and only fall back to get_settings if it does
not exist. So we can clean up all the fallback code, remove the
ethtool_ops, etc.

I personally don't care about out of tree drivers. They have had over
2 years to change to the new API.

	     Andrew