netdev - Re: [PATCH 1/1] ethtool: Expose MDI-X status

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Date:	Tue, 26 May 2009 17:02:48 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Chaitanya Lala <clala@...erbed.com>
Cc:	"jgarzik@...ox.com" <jgarzik@...ox.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/1] ethtool: Expose MDI-X status

On Tue, 2009-05-26 at 08:34 -0700, Chaitanya Lala wrote:
> Ben Hutchings wrote:
> > On Fri, 2009-05-22 at 10:18 -0700, Chaitanya Lala wrote:
> >   
> >> The MDI-X status is a useful tool for diagnosing network
> >> connectivity issues. We expose MDI-X status as a tri-state value
> >> status which drivers can optionally implement.
> >>
> >> Signed-off-by: Chaitanya Lala <clala@...erbed.com>
> >> Signed-off-by: Arthur Jones <ajones@...erbed.com>
> >> ---
> >>  ethtool-copy.h |    6 ++++++
> >>  ethtool.c      |   13 +++++++++++++
> >>  2 files changed, 19 insertions(+), 0 deletions(-)
> >>
> >> diff --git a/ethtool-copy.h b/ethtool-copy.h
> >> index 3ca4e2c..d3e1524 100644
> >> --- a/ethtool-copy.h
> >> +++ b/ethtool-copy.h
> >> @@ -28,6 +28,7 @@ struct ethtool_cmd {
> >>  	__u16	speed_hi;
> >>  	__u16	reserved2;
> >>  	__u32	reserved[3];
> >> +	__u8	is_mdix;	/* Tri-state value to expose MDI-X */
> >>  };
> >>     
> > [...]
> >
> > No, you cannot change the size of this structure either.
> >   
> Hi,
> 
> In that case please suggest a way to do this.

There are 14 bytes at the end of the structure reserved for future
expansion.  You could take one of them.

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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