From: Mina Almasry <almasrymina@google.com>
To: Christoph Hellwig <hch@infradead.org>,
Marc Harvey <marcharvey@google.com>,
"Cong Wang ." <cong.wang@bytedance.com>
Cc: shakeel.butt@linux.dev, netdev@vger.kernel.org,
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"Shailend Chand" <shailend@google.com>,
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"Praveen Kaligineedi" <pkaligineedi@google.com>
Subject: Re: [RFC PATCH net-next v6 02/15] net: page_pool: create hooks for custom page providers
Date: Mon, 1 Apr 2024 12:22:24 -0700 [thread overview]
Message-ID: <CAHS8izM8iLC9J1xSHScMrMkVyoY5HZ_nFMRO4V7HYarHhZhk6Q@mail.gmail.com> (raw)
In-Reply-To: <ZgUc07Szbx5x-obb@infradead.org>
On Thu, Mar 28, 2024 at 12:31 AM Christoph Hellwig <hch@infradead.org> wrote:
>
> 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.
>
I think this is positively thrilling news for me. I was worried that
adding devmemTCP support to storage devices would involve using a
non-dmabuf standard of buffer sharing like pci_p2pdma_
(drivers/pci/p2pdma.c) and that would require messy changes to
pci_p2pdma_ that would get nacked. Also it would require adding
pci_p2pdma_ support to devmem TCP, which is a can of worms. If adding
dma-buf support to storage devices is feasible and desirable, that's a
much better approach IMO. (a) it will maybe work with devmem TCP
without any changes needed on the netdev side of things and (b)
dma-buf support may be generically useful and a good contribution even
outside of devmem TCP.
I don't have a concrete user for devmem TCP for storage devices but
the use case is very similar to GPU and I imagine the benefits in perf
can be significant in some setups.
Christoph, if you have any hints or rough specific design in mind for
how dma-buf support can be added to the block layer, please do let us
know and we'll follow your hints to investigate. But I don't want to
use up too much of your time. Marc and I can definitely read enough
code to figure out how to do it ourselves :-)
Marc, please review and consider this thread and work, this could be a
good project for you and I. I imagine the work would be:
1. Investigate how to add dma-buf support to the block layer (maybe
write a prototype code, and maybe even test it with devmem TCP).
2. Share a code or no-code proposal with netdev/fs/block layer mailing
list and try to work through concerns/nacks.
3. Finally share RFC through merging etc.
--
Thanks,
Mina
next prev parent reply other threads:[~2024-04-01 19:22 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-05 2:01 [RFC PATCH net-next v6 00/15] Device Memory TCP Mina Almasry
2024-03-05 2:01 ` [RFC PATCH net-next v6 01/15] queue_api: define queue api Mina Almasry
2024-03-08 1:30 ` Jakub Kicinski
2024-03-08 2:08 ` Mina Almasry
2024-03-08 3:36 ` Jakub Kicinski
2024-03-08 23:47 ` David Wei
2024-03-09 0:27 ` Mina Almasry
2024-03-11 1:12 ` David Ahern
2024-03-05 2:01 ` [RFC PATCH net-next v6 02/15] net: page_pool: create hooks for custom page providers Mina Almasry
2024-03-05 21:54 ` David Wei
2024-03-05 22:36 ` Mina Almasry
2024-03-06 14:29 ` Pavel Begunkov
2024-03-06 17:04 ` Mina Almasry
2024-03-06 19:12 ` Pavel Begunkov
2024-03-06 21:59 ` Mina Almasry
2024-03-07 14:25 ` Pavel Begunkov
2024-03-08 4:57 ` David Wei
2024-03-08 19:53 ` Mina Almasry
2024-03-18 2:02 ` Christoph Hellwig
2024-03-18 2:49 ` David Wei
2024-03-18 23:22 ` Christoph Hellwig
2024-03-22 17:40 ` Mina Almasry
2024-03-22 23:19 ` Jakub Kicinski
2024-03-24 23:35 ` Christoph Hellwig
2024-03-24 23:35 ` Christoph Hellwig
2024-03-22 17:54 ` Mina Almasry
2024-03-24 23:37 ` Christoph Hellwig
2024-03-26 20:19 ` Mina Almasry
2024-03-28 7:31 ` Christoph Hellwig
2024-04-01 19:22 ` Mina Almasry [this message]
2024-04-08 15:34 ` Cong Wang
2024-03-05 2:01 ` [RFC PATCH net-next v6 03/15] net: page_pool: factor out page_pool recycle check Mina Almasry
2024-03-05 12:55 ` Yunsheng Lin
2024-03-05 2:01 ` [RFC PATCH net-next v6 04/15] net: netdev netlink api to bind dma-buf to a net device Mina Almasry
2024-03-05 2:01 ` [RFC PATCH net-next v6 05/15] netdev: support binding dma-buf to netdevice Mina Almasry
2024-03-05 9:04 ` Arnd Bergmann
2024-03-05 20:00 ` Mina Almasry
2024-03-05 21:42 ` Arnd Bergmann
2024-03-05 12:55 ` Yunsheng Lin
2024-03-05 21:17 ` Mina Almasry
2024-03-06 12:38 ` Yunsheng Lin
2024-03-06 22:10 ` Mina Almasry
2024-03-07 12:15 ` Yunsheng Lin
2024-03-08 3:58 ` Jakub Kicinski
2024-03-05 2:01 ` [RFC PATCH net-next v6 06/15] netdev: netdevice devmem allocator Mina Almasry
2024-03-05 2:01 ` [RFC PATCH net-next v6 07/15] page_pool: convert to use netmem Mina Almasry
2024-03-05 21:30 ` Mina Almasry
2024-03-05 2:01 ` [RFC PATCH net-next v6 08/15] page_pool: devmem support Mina Almasry
2024-03-05 21:42 ` Mina Almasry
2024-03-05 2:01 ` [RFC PATCH net-next v6 09/15] memory-provider: dmabuf devmem memory provider Mina Almasry
2024-03-06 2:28 ` David Wei
2024-03-06 2:42 ` Mina Almasry
2024-03-06 2:46 ` David Wei
2024-03-06 2:54 ` Mina Almasry
2024-03-06 14:58 ` Pavel Begunkov
2024-03-06 16:51 ` Mina Almasry
2024-03-05 2:01 ` [RFC PATCH net-next v6 10/15] net: support non paged skb frags Mina Almasry
2024-03-05 2:01 ` [RFC PATCH net-next v6 11/15] net: add support for skbs with unreadable frags Mina Almasry
2024-03-05 2:01 ` [RFC PATCH net-next v6 12/15] tcp: RX path for devmem TCP Mina Almasry
2024-03-05 8:41 ` Arnd Bergmann
2024-03-05 19:22 ` Mina Almasry
2024-03-05 19:39 ` Arnd Bergmann
2024-03-05 2:01 ` [RFC PATCH net-next v6 13/15] net: add SO_DEVMEM_DONTNEED setsockopt to release RX frags Mina Almasry
2024-03-05 2:01 ` [RFC PATCH net-next v6 14/15] net: add devmem TCP documentation Mina Almasry
2024-03-08 1:52 ` Jakub Kicinski
2024-03-05 2:01 ` [RFC PATCH net-next v6 15/15] selftests: add ncdevmem, netcat for devmem TCP Mina Almasry
2024-03-05 7:16 ` [RFC PATCH net-next v6 07/15] page_pool: convert to use netmem David Howells
2024-03-05 12:54 ` [RFC PATCH net-next v6 00/15] Device Memory TCP Yunsheng Lin
2024-03-05 19:38 ` Mina Almasry
2024-03-06 12:37 ` Yunsheng Lin
2024-03-26 0:28 ` Mina Almasry
2024-03-26 12:47 ` Yunsheng Lin
2024-03-26 20:14 ` Mina Almasry
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