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

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Date:	Wed, 27 Jul 2011 22:27:49 -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: 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.
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