netdev - Re: invalid requirement from ethtool?

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Message-ID: <1311848553.2619.1.camel@deadeye>
Date:	Thu, 28 Jul 2011 12:22:33 +0200
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	David Miller <davem@...emloft.net>
Cc:	eli@....mellanox.co.il, netdev@...r.kernel.org
Subject: Re: invalid requirement from ethtool?

On Thu, 2011-07-28 at 00:37 -0700, David Miller wrote:
> From: Eli Cohen <eli@....mellanox.co.il>
> Date: Thu, 28 Jul 2011 10:23:26 +0300
> 
> > On Wed, Jul 27, 2011 at 10:43:09PM -0700, David Miller wrote:
> >> From: Eli Cohen <eli@....mellanox.co.il>
> >> Date: Tue, 26 Jul 2011 15:42:22 +0300
> >> 
> >> > I think both params zero should be allowed and mean coalescing is not
> >> > operational, thus we can remove these comments from ethtool.h
> >> 
> >> The existing precendence has existed for more than 10 years.  You can't
> >> just change it like this.
> >> 
> >> You'll need to find a new way to encode "disabled" coalescing.
> > 
> > I can't see the text explicitly specifies how to "disable" coalescing.
> > If I ignore the specific comment that disallows both params 0, I could
> > interpret the text such that when they're both zero, the feature is
> > disabled.
> 
> The documentation does not determine what the rules are, the cpu
> does not execute the documentation it executes the code, and that's
> what determines the rules.

The ethtool core doesn't check the values in struct ethtool_coalesce, so
the rules are really driver-specific.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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