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Date:   Mon, 17 Oct 2022 17:46:57 +0100
From:   Pavel Begunkov <>
To:     Stefan Metzmacher <>,
        io-uring <>, Jens Axboe <>
Cc:     Jakub Kicinski <>, netdev <>,
        Dylan Yudaken <>

Hey Stefan,

On 10/14/22 12:06, Stefan Metzmacher wrote:
> Hi Pavel,
> In the tests I made I used this version of IORING_CQE_F_COPIED:
> (also inlined at the end)
> Would that something we want for 6.1? (Should I post that with a useful commit message, after doing some more tests)

I was thinking, can it be delivered separately but not in the same cqe?
The intention is to keep it off the IO path. For example, it can emit a
zc status CQE or maybe keep a "zc failed" counter inside the ring. Other
options? And we can add a separate callback for that, will make a couple
of things better.

What do you think? Especially from the userspace usability perspective.

Pavel Begunkov

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