linux-kernel - Re: USBIP protocol

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Message-Id: <1220049103.7145.23.camel@californication>
Date:	Sat, 30 Aug 2008 00:31:43 +0200
From:	Marcel Holtmann <holtmann@...ux.intel.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Matthew Wilcox <matthew@....cx>, Greg KH <greg@...ah.com>,
	bgmerrell@...ell.com, hirofuchi@...rs.sourceforge.net,
	linux-kernel@...r.kernel.org, usbip-devel@...ts.sourceforge.net
Subject: Re: USBIP protocol

Hi Matthew,

> > I'm in the middle of implementing a userspace client for usbip and I
> > strongly feel that the protocol needs to be changed before it is merged.
> >
> >  - I'm unconvinced that TCP is the correct protocol to be running this over.
> >    I understand the reluctance to use UDP, but the protocol is fundamentally
> >    packet-based.  If TCP is used, the delimitation of packets within the
> >    stream needs to be much more robust. 
> 
> If you want reliable transport with record boundaries an alternative
> would be also SCTP. Main drawback is that firewalls often don't support it
> though (but presumably that wouldn't be a big issue for this)

I would also have proposed SCTP. The telco carries seems be very happy
with it.

Regards

Marcel


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