netdev - Re: [PATCH net-next] ethtool: Added a field fw dump

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Date:	Fri, 16 Mar 2012 14:22:42 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Anirban Chakraborty <anirban.chakraborty@...gic.com>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Dept-NX Linux NIC Driver 
	<Dept_NX_Linux_NIC_Driver@...gic.com>,
	Manish Chopra <manish.chopra@...gic.com>
Subject: Re: [PATCH net-next] ethtool: Added a field fw dump_state

On Fri, 2012-03-16 at 14:10 -0700, Anirban Chakraborty wrote:
> 
> On 3/16/12 11:27 AM, "Ben Hutchings" <bhutchings@...arflare.com> wrote:
> 
> >On Fri, 2012-03-16 at 10:58 -0700, Anirban Chakraborty wrote:
> >> +
> >>  struct ethtool_dump {
> >>  	__u32	cmd;
> >>  	__u32	version;
> >>  	__u32	flag;
> >>  	__u32	len;
> >>  	__u8	data[0];
> >> +	__u8	dump_state;
> >
> >Don't be ridiculous.
> 
> Yeah I know, especially when there is a flag field already present there.
> The only
> reason, we considered for adding it is to keep the backward compatibility
> of scripts.
> Right now, the flag field sets/gets the dump level of fw. If we use it to
> control the
> dump state, then it would break the existing scripts, if there are any.
> 

You missed the point... data[0] must be the last element in the
structure.



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