Re: NIC: Queue assignment to guest OS

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Tue, Apr 19, 2011 at 11:50:35AM -0700, Kallol Biswas wrote:
> Unfortunately other frameworks are not open source, and we can not use the design and expose to all.

Please don't top post.
> 
> On Apr 19, 2011, at 11:47 AM, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> wrote:
> 
> > On Thu, Apr 14, 2011 at 06:17:17PM -0700, Kallol Biswas wrote:
> >> Hi,
> >> 
> >>    I have a requirement to assign the transmit and receive queues of a NIC
> >> card to different guest operating systems so that the guests can directly
> >> submit transmit requests to controller and receive packets from NIC
> >> controller without going through a middle layer.  The NIC controller is not
> >> SRIOV capable and there are a few MSI-X vectors available.
> > 
> > OK. So you want to "export" the rx and tx queue (where each queue is associated
> > with an MSI-X) in the guest.
> > 
> >> 
> >> 
> >> 
> >> What would be the best way to implement the requirement in Xen? I am new to
> >> Xen but have experience in a similar virtualization framework.
> > 
> > How did you do this in other virtualization frameworks?

I am still at loss here how you guys managed this without ripping the network
driver of a NIC card and passed the MSI-X to a guest and the full PCI device
to _all_ of them and managed to negotiate some form of locking.