Re: [PATCH v2 4/5] RDMA/mlx5: Enable P2P DMA with fallback mechanism

[Jason Gunthorpe]

On Mon, Jul 21, 2025 at 12:03:41AM -0700, Christoph Hellwig wrote:
> On Fri, Jul 18, 2025 at 02:51:11PM +0300, Yonatan Maman wrote:
> > From: Yonatan Maman <Ymaman@xxxxxxxxxx>
> > 
> > Add support for P2P for MLX5 NIC devices with automatic fallback to
> > standard DMA when P2P mapping fails.
> 
> That's now how the P2P API works.  You need to check the P2P availability
> higher up.

How do you mean?

This looks OKish to me, for ODP and HMM it has to check the P2P
availability on a page by page basis because every single page can be
a different origin device.

There isn't really a higher up here...

Jason