netdev - Re: [PATCH net-next 0/6] kcm: Kernel Connection Multiplexor (KCM)

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Message-ID: <CALx6S350GV8BKVjwBCATc2G4-BB4K+bh+UBWKOazxm8e8XXb-g@mail.gmail.com>
Date:	Mon, 23 Nov 2015 12:02:21 -0800
From:	Tom Herbert <tom@...bertland.com>
To:	David Miller <davem@...emloft.net>
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Kernel Team <kernel-team@...com>, davewatson@...com,
	Alexei Starovoitov <alexei.starovoitov@...il.com>
Subject: Re: [PATCH net-next 0/6] kcm: Kernel Connection Multiplexor (KCM)

On Mon, Nov 23, 2015 at 11:54 AM, David Miller <davem@...emloft.net> wrote:
> From: Tom Herbert <tom@...bertland.com>
> Date: Mon, 23 Nov 2015 09:33:44 -0800
>
>> The TCP PSH flag is not defined for message delineation (neither is
>> urgent pointer). We can't change that (many people have tried to add
>> message semantics to TCP protocol but have always failed miserably).
>
> Agreed.
>
> My only gripe with kcm right now is a lack of a native sendpage.
> We should be able to zero copy data through KCM streams without
> any problems whatsoever.

Right, there is no reason zero copy won't work here. I was just trying
minimize the initial implementation small for reviewability.
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