netdev - Re: [RFC, 1/2] ethtool: Implement private flags interface for ethtool application.

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Message-ID: <CAHXqBFKU2m6s1fQzZpJRvvR2HatJpXjWXv84=ZYD5E6OPFfUmQ@mail.gmail.com>
Date:	Fri, 2 Sep 2011 23:17:17 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>
Cc:	David Miller <davem@...emloft.net>,
	"bhutchings@...arflare.com" <bhutchings@...arflare.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [RFC, 1/2] ethtool: Implement private flags interface for ethtool application.

2011/9/2 Wyborny, Carolyn <carolyn.wyborny@...el.com>:
>>-----Original Message-----
>>From: David Miller [mailto:davem@...emloft.net]
>>Sent: Friday, September 02, 2011 1:55 PM
>>To: Wyborny, Carolyn
>>Cc: bhutchings@...arflare.com; netdev@...r.kernel.org
>>Subject: Re: [RFC, 1/2] ethtool: Implement private flags interface for
>>ethtool application.
>>
>>From: Carolyn Wyborny <carolyn.wyborny@...el.com>
>>Date: Fri,  2 Sep 2011 13:50:30 -0700
>>
>>> This patch completes the user space implementation of the private
>>> flags inteface in ethtool. Using -b/-B options.
>>>
>>> Signed-off-by: Carolyn Wyborny <carolyn.wyborny@...el.com>
>>
>>The only use case you show here is something generic which other
>>chips have, Energy Efficient Ethernet.
>>
>>Making an attribute private which is present widely amonst various
>>networking chips makes no sense at all.
>>
>>It deserved a generic ethtool flag.
>
> Fair enough on this particular feature, but does that negate the implementation suggestion altogether?  I can send an updated feature implementation for the use case using DMA Coalescing if that will help.

I would rather see this as an extension to ETHTOOL_[GS]FEATURES. Its
semantics allow easy expanding to handle device-private flags without
changing anything on userspace side.

Best Regards,
Michał Mirosław
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