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

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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



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