netdev - Re: Memory providers multiplexing (Was: [PATCH net-next v4 4/5] page_pool: remove PP_FLAG_PAGE

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Message-ID: <ZK1FbjG+VP/zxfO1@ziepe.ca>
Date: Tue, 11 Jul 2023 09:05:02 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Christoph Hellwig <hch@....de>
Cc: Jakub Kicinski <kuba@...nel.org>, Mina Almasry <almasrymina@...gle.com>,
	John Hubbard <jhubbard@...dia.com>,
	Dan Williams <dan.j.williams@...el.com>,
	David Ahern <dsahern@...nel.org>,
	Jesper Dangaard Brouer <jbrouer@...hat.com>, brouer@...hat.com,
	Alexander Duyck <alexander.duyck@...il.com>,
	Yunsheng Lin <linyunsheng@...wei.com>, davem@...emloft.net,
	pabeni@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Lorenzo Bianconi <lorenzo@...nel.org>,
	Yisen Zhuang <yisen.zhuang@...wei.com>,
	Salil Mehta <salil.mehta@...wei.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Sunil Goutham <sgoutham@...vell.com>,
	Geetha sowjanya <gakula@...vell.com>,
	Subbaraya Sundeep <sbhatta@...vell.com>,
	hariprasad <hkelam@...vell.com>, Saeed Mahameed <saeedm@...dia.com>,
	Leon Romanovsky <leon@...nel.org>, Felix Fietkau <nbd@....name>,
	Ryder Lee <ryder.lee@...iatek.com>,
	Shayne Chen <shayne.chen@...iatek.com>,
	Sean Wang <sean.wang@...iatek.com>, Kalle Valo <kvalo@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	Ilias Apalodimas <ilias.apalodimas@...aro.org>,
	linux-rdma@...r.kernel.org, linux-wireless@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Jonathan Lemon <jonathan.lemon@...il.com>
Subject: Re: Memory providers multiplexing (Was: [PATCH net-next v4 4/5]
 page_pool: remove PP_FLAG_PAGE_FRAG flag)

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