linux-kernel - Re: [PATCH RFC v5] net: add PCINet driver

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Message-Id: <200901121856.12814.arnd@arndb.de>
Date:	Mon, 12 Jan 2009 18:56:12 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linuxppc-dev@...abs.org
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ira Snyder <iws@...o.caltech.edu>, netdev@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, shemminger@...tta.com,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH RFC v5] net: add PCINet driver

On Sunday 11 January 2009, Benjamin Herrenschmidt wrote:
> On Thu, 2009-01-08 at 13:51 -0800, Ira Snyder wrote:
> > The guests (PowerPC computers running Linux) are PCI cards in the host
> > system (an Intel Pentium3-M system). The guest computers can access all
> > of the host's memory. The guests provide a 1MB (movable) window into
> > their memory.
> > 
> > The PowerPC computers also have a DMA controller, which I've used to get
> > better throughput from my driver. I have a way to create interrupts to
> > both the host and guest systems.
> 
> That looks -very- similar to the PCI driver for CAB and Cell triblades
> that was, I think, submitted a while ago. Arnd what's the status with
> that driver ?

Complicated ;-)

There were two device drivers for the Axon PCIe endpoint (from Mercury
and IBM), but both were abandoned due to being too complex to get into
a mergeable stage, and all the original developers are doing other work
now.

I'm maintaining the IBM driver now, but have no plans to submit that
for inclusion. I hope that I can soon find more time to work on a
replacement driver that will provide the right abstraction through
virtio for kernel drivers, plus a ibverbs user interface for direct
application programming. It should also have pluggable backends to
support not only Cell hardware but anything with a similar hardware
implementation.

I did make a presentation about this at the Plumbers Conference, see
http://userweb.kernel.org/%7Earnd/papers/plumbers08/plumbers-slides.pdf.
Since then, I have come to a much clearer idea of what needs to be
done, but not more actual code.

	Arnd <><
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