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

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Message-ID: <20090115192129.GB9091@ovro.caltech.edu>
Date:	Thu, 15 Jan 2009 11:21:29 -0800
From:	Ira Snyder <iws@...o.caltech.edu>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	David Miller <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	shemminger@...tta.com, netdev@...r.kernel.org
Subject: Re: [PATCH RFC v5] net: add PCINet driver

On Thu, Jan 15, 2009 at 06:53:51PM +0100, Arnd Bergmann wrote:
> On Thursday 15 January 2009, Ira Snyder wrote:
> > 
> > These are PCI boards, not PCIe. The host computers are all Pentium3-M
> > systems. I tried enabling MSI on the Freescale boards in the driver, by
> > calling pci_enable_msi() during probe(), and it failed. 
> 
> That doesn't really mean anything, just that the PCI endpoint doesn't
> announce its capability to do MSI in the config space, or that it
> does not have an interrupt line. Since you basically implement the
> device on the FSL board, you should also be able to define the interrupt
> capabilities by writing to the config space.
> 
> Do you know what kind of chipset the host uses? It should be fairly
> simple to find out whether or not it can do MSI.
> 

I have another question for you Arnd.

What did you use as the host and guest drivers when you ran virtio over
PCI? Did you use two unmodified instances of virtio_net (one on host,
one on guest) for networking, or did you write new virtio drivers for
those? How about for virtio_console (if you ran it at all).

Thanks again,
Ira
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