netdev - Re: [RFC net-next PATCH 3/4] ethtool: Add new set commands

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Date:	Thu, 28 Jul 2011 09:14:48 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	gregory.v.rose@...el.com
Cc:	netdev@...r.kernel.org, bhutchings@...arflare.com,
	jeffrey.t.kirsher@...el.com
Subject: Re: [RFC net-next PATCH 3/4] ethtool: Add new set commands

From: "Rose, Gregory V" <gregory.v.rose@...el.com>
Date: Thu, 28 Jul 2011 08:51:05 -0700

>> -----Original Message-----
>> From: David Miller [mailto:davem@...emloft.net]
>> Sent: Wednesday, July 27, 2011 10:28 PM
>> To: Rose, Gregory V
>> Cc: netdev@...r.kernel.org; bhutchings@...arflare.com; Kirsher, Jeffrey T
>> Subject: Re: [RFC net-next PATCH 3/4] ethtool: Add new set commands
>> 
>> From: Greg Rose <gregory.v.rose@...el.com>
>> Date: Wed, 27 Jul 2011 15:17:59 -0700
>> 
>> > Add new set commands to configure the number of SR-IOV VFs, the
>> > number of VM queues and spoof checking on/off switch.
>> >
>> > Signed-off-by: Greg Rose <gregory.v.rose@...el.com>
>> > ---
>> >
>> >  include/linux/ethtool.h |   11 ++++++++++-
>> >  1 files changed, 10 insertions(+), 1 deletions(-)
>> >
>> > diff --git a/include/linux/ethtool.h b/include/linux/ethtool.h
>> > index c6e427a..c4972ba 100644
>> > --- a/include/linux/ethtool.h
>> > +++ b/include/linux/ethtool.h
>> > @@ -36,12 +36,14 @@ struct ethtool_cmd {
>> >  	__u8	mdio_support;
>> >  	__u32	maxtxpkt;	/* Tx pkts before generating tx int */
>> >  	__u32	maxrxpkt;	/* Rx pkts before generating rx int */
>> > +	__u32	num_vfs;	/* Enable SR-IOV VFs */
>> > +	__u32	num_vmqs;	/* Set number of queues for VMDq */
>> 
>> You can't change the layout of this datastructure in this way without
>> breaking every ethtool binary out there.
>> 
>> You have to find another place to add these knobs.
> 
> Perhaps at the end of the ethtool_cmd structure?  Something like this:

Either use the two reserved u32's we have there, or create a new
ethtool command and control structure.
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