Yes, I think a DDI interface to this is preferred.
I've started looking at this. It looks like DDI_INTROP functions are
needed. Unfortunately, this portion of the code is really quite
platform specific, and it will take some time to figure out how best to
handle this. Separate implementations for i86pc, sun4v, and probably
also sun4u, will be required... at minimum.
-- Garrett
On Mon, 2007-07-30 at 19:37 -0700, Nitin Hande wrote:
> Sunay
>
> For static assignment, currently there is an ioctl interface
> "PCITOOL_DEVICE_SET_INTR" to open a nexus driver and change interrupt
> assignment. This is a userland interface used by pcitool. One can use
> "pcitool -i <i-no> -w <cpu-id>" to statically change interrupt
> assignment. This is the only supported interface. A kernel interface was
> requested by Ethan Solomita (intrd team), but is not present yet.
> Besides from what Govinda (cc'ed on this thread) has described, opening
> a nexus driver and changing the interrupt assignment from within the
> kernel (i.e calling pcitool_set_intr) is not recommended/supported
> .Rather they would like to create a ddi_xxx alike interface for such
> task ....
>
> Nitin
>
>
>
> Sunay Tripathi wrote:
> > Garrett/Roamer,
> >
> > Have you made any progress with interrupt retargetting code. Basically,
> > when a cpu list is specified via '-C' option for a NIC/VNIC or flow,
> > we need to do two things:
> > 1) Make i_ddi_intr_get_cpuid() work so in case of NIC having a single
> > interrupt, we can assign it to one of the specified CPUs if the
> > CPU list is specified for a NIC.
> > 2) In case the NIC supports MSI-X interrupt, we should be able to assign
> > the interrupt for the Rx ring to one of the specified CPUs.
> >
> > Which also means that the MAC to driver APIs need to be strong enough to
> > be able to associate a MSI-X interrupt with a Rx ring (Kais??).
> >
> > Cheers,
> > Sunay
> >
> >
>
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