netdev - Re: [RFC 0/4] open/accept directly into io

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Message-ID: <48bd91bc-ba1a-1e69-03a1-3d6f913f96c3@kernel.dk>
Date:   Wed, 7 Jul 2021 07:07:52 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Pavel Begunkov <asml.silence@...il.com>, io-uring@...r.kernel.org
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, Josh Triplett <josh@...htriplett.org>
Subject: Re: [RFC 0/4] open/accept directly into io_uring fixed file table

On 7/7/21 5:39 AM, Pavel Begunkov wrote:
> Implement an old idea allowing open/accept io_uring requests to register
> a newly created file as a io_uring's fixed file instead of placing it
> into a task's file table. The switching is encoded in io_uring's SQEs
> by setting sqe->buf_index/file_index, so restricted to 2^16-1. Don't
> think we need more, but may be a good idea to scrap u32 somewhere
> instead.
> 
> From the net side only needs a function doing __sys_accept4_file()
> but not installing fd, see 2/4.
> 
> Only RFC for now, the new functionality is tested only for open yet.
> I hope we can remember the author of the idea to add attribution.

Pretty sure the original suggester of this as Josh, CC'ed.

-- 
Jens Axboe