Re: [PATCH v11 00/19] PCI/P2PDMA: Route peer-to-peer DMA by TLP class

[Bjorn Helgaas]

On Wed, Oct 14, 2026 at 09:53:47AM +0300, Leon Romanovsky wrote:
> On Tue, Oct 13, 2026 at 05:25:08PM +0300, Leon Romanovsky wrote:
> > PCI P2PDMA applies Request and Completion Redirect throughout both paths.
> > This misclassifies asymmetric and nested switches, and reports one answer
> > for every kind of TLP.
> > 
> > Three ACS controls act on TLP attributes the Requester chooses rather
> > than on the topology: Translation Blocking and Direct Translated P2P act on
> > a Request's Address Type, and Completion Redirect skips Completions carrying
> > Relaxed Ordering.
> > 
> > Evaluate each direction at the path divergence, decide every class from the
> > one walk, and treat a client with ATS enabled as translating unless its
> > driver declares per-mapping ATS.
> > 
> > This completes the P2PDMA side; dma-buf and mlx5 follow separately.
> > 
> > Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxx>
> > ---
> > Changes in v11:
> 
> 
> Bjorn,
> 
> Could you please save me from the AI-bot attack? Every rebase seems to
> uncover another bizarre pre-existing issue. It never ends.

Can you elaborate?  I'm not sure what you'd like me to do here.  I
don't control the Sashiko reviews, and I thought Sashiko was recently
changed to put pre-existing issues in a database but not in the email
responses.

Bjorn