Re: [PATCH v11 04/13] PCI: Allow PASID only when ACS enforced on upstreaming path

[Baolu Lu]

On 2022/8/18 06:48, Jason Gunthorpe wrote:
> On Wed, Aug 17, 2022 at 04:17:43PM -0500, Bjorn Helgaas wrote:
>
> > Does the PCIe spec really allow TLPs with PASID to be routed anywhere
> > except upstream?
> I think yes:
>
>   2.2.10.2 End-End TLP Prefix Processing:
>
>   The presence of an End-End TLP Prefix does not alter the routing of a
>   TLP. TLPs are routed based on the routing rules covered in Section
>   2.2.4 .
>
> Which I read as saying that routing is done after stripping all the
> prefixes. PASID is a prefix.
>
> Lu, you may want to quote the spec in the commit message to make it
> clear.

Yes. Sure thing. Thank you!

Best regards,
baolu