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Date:   Wed, 20 Jul 2022 06:46:39 -0600
From:   Jens Axboe <>
Subject: Re: (subset) [PATCH net-next v5 00/27] io_uring zerocopy send

On Tue, 12 Jul 2022 21:52:24 +0100, Pavel Begunkov wrote:
> NOTE: Not to be picked directly. After getting necessary acks, I'll be
>       working out merging with Jakub and Jens.
> The patchset implements io_uring zerocopy send. It works with both registered
> and normal buffers, mixing is allowed but not recommended. Apart from usual
> request completions, just as with MSG_ZEROCOPY, io_uring separately notifies
> the userspace when buffers are freed and can be reused (see API design below),
> which is delivered into io_uring's Completion Queue. Those "buffer-free"
> notifications are not necessarily per request, but the userspace has control
> over it and should explicitly attaching a number of requests to a single
> notification. The series also adds some internal optimisations when used with
> registered buffers like removing page referencing.
> [...]

Applied, thanks!

[12/27] io_uring: initialise msghdr::msg_ubuf
        commit: 06f241e2bf4ba2a3e77269be25d21c0196a57a4f
[13/27] io_uring: export io_put_task()
        commit: ba64c07a6ef9a05ca9eb09e13b70df7500e78cf8
[14/27] io_uring: add zc notification infrastructure
        commit: 6f322c753daee4b9d4ad494d4e8b05da610d804c
[15/27] io_uring: cache struct io_notif
        commit: cf49e2d47c49e547d4bc370efe73785fc82354e5
[16/27] io_uring: complete notifiers in tw
        commit: 9cc16ae447db07d210175d2ad2419784dd20f784
[17/27] io_uring: add rsrc referencing for notifiers
        commit: e133e289093ea35c1f7f940fe4c0ceb62037dc59
[18/27] io_uring: add notification slot registration
        commit: f20b817fd29b64ef6de24b83ef23e1f3fb273967
[19/27] io_uring: wire send zc request type
        commit: 480ec5ff9a5a75d68423c0bd02e57a9ee6325320
[20/27] io_uring: account locked pages for non-fixed zc
        commit: fcb98e61d0232cff7dd14ae85ad1c88d68f98273
[21/27] io_uring: allow to pass addr into sendzc
        commit: 7ab12997edc9aa3e2be4169f929c50a1fcd41004
[22/27] io_uring: sendzc with fixed buffers
        commit: bb4019de9ea11d21137b4a8ff01d9e338071d633
[23/27] io_uring: flush notifiers after sendzc
        commit: 95a70c191696da64a6ae235d52132a5c17866dae
[24/27] io_uring: rename IORING_OP_FILES_UPDATE
        commit: d488e605a45192f9f60c7624d46ba0b8c4d93aab
[25/27] io_uring: add zc notification flush requests
        commit: cb155defb9bf20a647c8825a085695f3f94fdb60
[26/27] io_uring: enable managed frags with register buffers
        commit: 04ae3dbe8a027cf10ab759456ffc4fb119486f74
[27/27] selftests/io_uring: test zerocopy send
        commit: 0c450de20ce7d6bc8a2f97c98387baf910454477

Best regards,
Jens Axboe

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