netdev - Re: [RFC] ethtool: Expand ethtool

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Message-ID: <20080716064709.GA2424@potty.ifup.org>
Date:	Tue, 15 Jul 2008 23:47:09 -0700
From:	Brandon Philips <brandon@...p.org>
To:	David Miller <davem@...emloft.net>
Cc:	rick.jones2@...com, jgarzik@...ox.com, netdev@...r.kernel.org
Subject: Re: [RFC] ethtool: Expand ethtool_cmd.speed to 32 bits

On 15:27 Tue 15 Jul 2008, David Miller wrote:
> From: Rick Jones <rick.jones2@...com>
> Date: Tue, 15 Jul 2008 14:53:16 -0700
> 
> > Brandon Philips wrote:
> > > Introduce the speed_hi field to ethtool_cmd, using the reserved space,
> > > to expand the speed field to 2^32 Megabits/second.
> > > 
> > > Making this field expansion now gives us plenty of time to fix up the
> > > user-space pieces that use SIOCETHTOOL before hardware faster than 64
> > > Gb/s is available.
> > > 
> > > Signed-off-by: Brandon Philips <bphilips@...e.de>
> > > 
> > > ---
> > >  include/linux/ethtool.h |   17 ++++++++++++++++-
> > >  1 file changed, 16 insertions(+), 1 deletion(-)
> > > 
> > > Index: linux-2.6/include/linux/ethtool.h
> > > ===================================================================
> > > --- linux-2.6.orig/include/linux/ethtool.h
> > > +++ linux-2.6/include/linux/ethtool.h
> > > @@ -27,9 +27,24 @@ struct ethtool_cmd {
> > >  	__u8	autoneg;	/* Enable or disable autonegotiation */
> > >  	__u32	maxtxpkt;	/* Tx pkts before generating tx int */
> > >  	__u32	maxrxpkt;	/* Rx pkts before generating rx int */
> > > -	__u32	reserved[4];
> > > +	__u16	speed_hi;
> > > +	__u16	reserved2;
> > > +	__u32	reserved[3];
> > >  };
> > 
> > I certainly agree with the concept of preparing for faster NICs.  Are 
> > bits in that structure sufficiently precious to go the split route, or 
> > would it be cleaner to just grab a contiguous 32 bits from the structure?
> 
> That's less space we can use to make similar expansions.
> 
> And we have to keep the existing u16 chunk there anyways, because existing
> applications are only going to provide that part.

Agreed.  Can this be queued for 2.6.27 then?

Thanks,

	Brandon
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