netdev - Re: [PATCH v1 1/6] net: Generalize udp based tunnel offload

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Message-ID: <CALx6S37AVnVxbcW=N451qH1VKiNJ1HZYEj8eqob-4hXWcHbD3g@mail.gmail.com>
Date:	Tue, 24 Nov 2015 09:52:49 -0800
From:	Tom Herbert <tom@...bertland.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	"Singhai, Anjali" <anjali.singhai@...el.com>,
	Jesse Gross <jesse@...nel.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	"Patil, Kiran" <kiran.patil@...el.com>
Subject: Re: [PATCH v1 1/6] net: Generalize udp based tunnel offload

On Tue, Nov 24, 2015 at 9:43 AM, Hannes Frederic Sowa
<hannes@...essinduktion.org> wrote:
> On Tue, Nov 24, 2015, at 18:32, Tom Herbert wrote:
>> As you said this in only feedback and nobody is forcing anyone to do
>> anything. But encouraging HW vendors to provide generic mechanisms so
>> that your users can use whatever protocol they want is the exact
>> _opposite_ of punishing users, this is very much a pro-user direction.
>
> Some users will suffer worse performance in case we don't correctly set
> ip_summed for a specific protocol before we do the copy operations from
> user space into skbs but if they are always done in the driver.
>
Please be specific. Who are the users, what is exact performance
regression, what are specific protocols in question?

> Bye,
> Hannes
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