netdev - Re: [PATCH RFC 0/3] kcm: Kernel Connection Multiplexor (KCM)

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Message-ID: <56011C08.4070109@rockbox.org>
Date:	Tue, 22 Sep 2015 11:14:48 +0200
From:	Thomas Martitz <kugel@...kbox.org>
To:	Tom Herbert <tom@...bertland.com>, davem@...emloft.net,
	netdev@...r.kernel.org
Cc:	kernel-team@...com
Subject: Re: [PATCH RFC 0/3] kcm: Kernel Connection Multiplexor (KCM)

Am 21.09.2015 um 00:29 schrieb Tom Herbert:
> Kernel Connection Multiplexor (KCM) is a facility that provides a
> message based interface over TCP for generic application protocols.
> The motivation for this is based on the observation that although
> TCP is byte stream transport protocol with no concept of message
> boundaries, a common use case is to implement a framed application
> layer protocol running over TCP. To date, most TCP stacks offer
> byte stream API for applications, which places the burden of message
> delineation, message I/O operation atomicity, and load balancing
> in the application. With KCM an application can efficiently send
> and receive application protocol messages over TCP using a
> datagram interface.
>


Hello Tom,

on a general note I'm wondering what this offers over the existing SCTP 
support. SCTP offers reliable message exchange and multihoming already.

On a specific note, I'm wondering if the dup(2) familiy of system calls 
isn't a lot more suitable/natural instead of overloading accept.

Best regards.
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