From: Pavel Begunkov <asml.silence@gmail.com>
To: Keith Busch <kbusch@meta.com>,
ming.lei@redhat.com, axboe@kernel.dk,
linux-block@vger.kernel.org, io-uring@vger.kernel.org
Cc: bernd@bsbernd.com, csander@purestorage.com,
linux-nvme@lists.infradead.org, Keith Busch <kbusch@kernel.org>
Subject: Re: [PATCHv7 2/6] io_uring: add support for kernel registered bvecs
Date: Thu, 27 Feb 2025 15:54:31 +0000 [thread overview]
Message-ID: <844f45ac-e36e-4784-9f8d-528b022dff9c@gmail.com> (raw)
In-Reply-To: <20250226182102.2631321-3-kbusch@meta.com>
On 2/26/25 18:20, Keith Busch wrote:
> From: Keith Busch <kbusch@kernel.org>
>
> Provide an interface for the kernel to leverage the existing
> pre-registered buffers that io_uring provides. User space can reference
> these later to achieve zero-copy IO.
>
> User space must register an empty fixed buffer table with io_uring in
> order for the kernel to make use of it.
Can you also fail rw.c:loop_rw_iter()? Something like:
loop_rw_iter() {
if ((req->flags & REQ_F_BUF_NODE) &&
req->buf_node->buf->release)
return -EFAULT;
}
--
Pavel Begunkov
next prev parent reply other threads:[~2025-02-27 15:53 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-26 18:20 [PATCHv7 0/6] ublk zero copy support Keith Busch
2025-02-26 18:20 ` [PATCHv7 1/6] io_uring/rw: move fixed buffer import to issue path Keith Busch
2025-02-26 19:04 ` Jens Axboe
2025-02-26 20:20 ` Jens Axboe
2025-02-27 21:46 ` Keith Busch
2025-02-26 18:20 ` [PATCHv7 2/6] io_uring: add support for kernel registered bvecs Keith Busch
2025-02-26 20:36 ` Jens Axboe
2025-02-27 15:54 ` Pavel Begunkov [this message]
2025-02-27 16:04 ` Jens Axboe
2025-02-27 22:45 ` Keith Busch
2025-02-28 12:19 ` Pavel Begunkov
2025-02-26 18:20 ` [PATCHv7 3/6] nvme: map uring_cmd data even if address is 0 Keith Busch
2025-02-26 18:20 ` [PATCHv7 4/6] ublk: zc register/unregister bvec Keith Busch
2025-02-26 18:40 ` Jens Axboe
2025-02-27 15:08 ` kernel test robot
2025-02-27 15:42 ` kernel test robot
2025-02-26 18:21 ` [PATCHv7 5/6] io_uring: add abstraction for buf_table rsrc data Keith Busch
2025-02-26 18:21 ` [PATCHv7 6/6] io_uring: cache nodes and mapped buffers Keith Busch
2025-02-26 18:48 ` Jens Axboe
2025-02-26 19:36 ` Jens Axboe
2025-02-26 19:43 ` Jens Axboe
2025-02-26 19:58 ` Jens Axboe
2025-02-26 20:00 ` Keith Busch
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