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

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Date:	Fri, 16 Mar 2012 15:37:42 -0700
From:	Anirban Chakraborty <anirban.chakraborty@...gic.com>
To:	Ben Hutchings <bhutchings@...arflare.com>,
	Eric Dumazet <eric.dumazet@...il.com>
CC:	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 3/16/12 2:37 PM, "Ben Hutchings" <bhutchings@...arflare.com> wrote:

>On Fri, 2012-03-16 at 14:22 -0700, Eric Dumazet wrote:
>> 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.
>
>Right.  And len is documented as not used by the ETHTOOL_SET_DUMP
>command so we cannot say that when len == 1 then data[0] is this new
>flag.
>
>Just reserve some value of the flag to mean 'disable', say 0 or
>0xffffffff.  If you want this 'disable' value to be understood by all
>drivers and have ethtool support a keyword for it then also define a
>macro for the value in ethtool.h.

Thanks for your comments. We'll take care of it next submittal.

-Anirban


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