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Date:   Tue, 11 Jul 2023 09:05:02 -0300
From:   Jason Gunthorpe <jgg@ziepe.ca>
To:     Christoph Hellwig <hch@lst.de>
Cc:     Jakub Kicinski <kuba@kernel.org>,
        Mina Almasry <almasrymina@google.com>,
        John Hubbard <jhubbard@nvidia.com>,
        Dan Williams <dan.j.williams@intel.com>,
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        Jonathan Lemon <jonathan.lemon@gmail.com>
Subject: Re: Memory providers multiplexing (Was: [PATCH net-next v4 4/5]
 page_pool: remove PP_FLAG_PAGE_FRAG flag)
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On Tue, Jul 11, 2023 at 07:04:45AM +0200, Christoph Hellwig wrote:
> On Mon, Jul 10, 2023 at 09:59:06PM -0700, Jakub Kicinski wrote:
> > On Tue, 11 Jul 2023 06:27:08 +0200 Christoph Hellwig wrote:
> > > Not going to comment on the rest of this as it seems bat shit crazy
> > > hacks for out of tree junk.  Why is anyone even wasting time on this?
> > 
> > Noob question - how does RDMA integrate with the out of tree junk?
> > AFAIU it's possible to run the "in-tree" RDMA stack and get "GPU
> > direct".
> 
> I don't care and it has absolutel no business being discussed here.
> 
> FYI at leat iWarp is a totally open standard.

So is Infiniband, Jakub has a unique definition of "proprietary".

RDMA works with the AMD and Intel intree drivers using DMABUF without
requiring struct pages using the DRM hacky scatterlist approach.

Jason