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Message-ID: <ZgUc07Szbx5x-obb@infradead.org>
Date: Thu, 28 Mar 2024 00:31:31 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Mina Almasry <almasrymina@...gle.com>
Cc: Christoph Hellwig <hch@...radead.org>, shakeel.butt@...ux.dev,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-alpha@...r.kernel.org,
	linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
	sparclinux@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org, linux-media@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	Richard Henderson <richard.henderson@...aro.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>,
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	"James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
	Helge Deller <deller@....de>, Andreas Larsson <andreas@...sler.com>,
	Jesper Dangaard Brouer <hawk@...nel.org>,
	Ilias Apalodimas <ilias.apalodimas@...aro.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Arnd Bergmann <arnd@...db.de>, Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>,
	Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	David Ahern <dsahern@...nel.org>,
	Willem de Bruijn <willemdebruijn.kernel@...il.com>,
	Shuah Khan <shuah@...nel.org>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Christian König <christian.koenig@....com>,
	Pavel Begunkov <asml.silence@...il.com>, David Wei <dw@...idwei.uk>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Yunsheng Lin <linyunsheng@...wei.com>,
	Shailend Chand <shailend@...gle.com>,
	Harshitha Ramamurthy <hramamurthy@...gle.com>,
	Jeroen de Borst <jeroendb@...gle.com>,
	Praveen Kaligineedi <pkaligineedi@...gle.com>
Subject: Re: [RFC PATCH net-next v6 02/15] net: page_pool: create hooks for
 custom page providers

On Tue, Mar 26, 2024 at 01:19:20PM -0700, Mina Almasry wrote:
> 
> Are you envisioning that dmabuf support would be added to the block
> layer

Yes.

> (which I understand is part of the VFS and not driver specific),

The block layer isn't really the VFS, it's just another core stack
like the network stack.

> or as part of the specific storage driver (like nvme for example)? If
> we can add dmabuf support to the block layer itself that sounds
> awesome. We may then be able to do devmem TCP on all/most storage
> devices without having to modify each individual driver.

I suspect we'll still need to touch the drivers to understand it,
but hopefully all the main infrastructure can live in the block layer.

> In your estimation, is adding dmabuf support to the block layer
> something technically feasible & acceptable upstream? I notice you
> suggested it so I'm guessing yes to both, but I thought I'd confirm.

I think so, and I know there has been quite some interest to at least
pre-register userspace memory so that the iommu overhead can be
pre-loaded.  It also is a much better interface for Peer to Peer
transfers than what we currently have.


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