netdev - Re: [PATCH net-next 01/12] ethtool: add infrastructure for centralized checking of coalescing parameters

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Date:   Wed, 4 Mar 2020 16:19:58 +0100
From:   Michal Kubecek <mkubecek@...e.cz>
To:     netdev@...r.kernel.org
Cc:     Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
        davem@...emloft.net, thomas.lendacky@....com, benve@...co.com,
        _govind@....com, pkaustub@...co.com, peppe.cavallaro@...com,
        alexandre.torgue@...com, joabreu@...opsys.com, snelson@...sando.io,
        yisen.zhuang@...wei.com, salil.mehta@...wei.com,
        jeffrey.t.kirsher@...el.com, jacob.e.keller@...el.com,
        alexander.h.duyck@...ux.intel.com, michael.chan@...adcom.com,
        saeedm@...lanox.com, leon@...nel.org
Subject: Re: [PATCH net-next 01/12] ethtool: add infrastructure for
 centralized checking of coalescing parameters

On Wed, Mar 04, 2020 at 03:54:39PM +0100, Andrew Lunn wrote:
> On Tue, Mar 03, 2020 at 07:54:50PM -0800, Jakub Kicinski wrote:
> > @@ -2336,6 +2394,11 @@ ethtool_set_per_queue_coalesce(struct net_device *dev,
> >  			goto roll_back;
> >  		}
> >  
> > +		if (!ethtool_set_coalesce_supported(dev, &coalesce)) {
> > +			ret = -EINVAL;
> > +			goto roll_back;
> > +		}
> 
> Hi Jakub
> 
> EOPNOTSUPP? 

Out of the 11 drivers patched in the rest of the series, 4 used
EOPNOTSUPP, 3 EINVAL and 4 just ignored unsupported parameters so there
doesn't seem to be a clear consensus. Personally I find EOPNOTSUPP more
appropriate but it's quite common that drivers return EINVAL for
parameters they don't understand or support.

BtW, there is a v2 later.

Michal