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Date:   Fri, 21 Oct 2022 10:27:29 +0100
From:   Pavel Begunkov <>
To:     Stefan Metzmacher <>,
        io-uring <>, Jens Axboe <>
Cc:     Jakub Kicinski <>, netdev <>,
        Dylan Yudaken <>

On 10/21/22 09:32, Stefan Metzmacher wrote:
> Hi Pavel,
>>>>> Experimenting with this stuff lets me wish to have a way to
>>>>> have a different 'user_data' field for the notif cqe,
>>>>> maybe based on a IORING_RECVSEND_ flag, it may make my life
>>>>> easier and would avoid some complexity in userspace...
>>>>> As I need to handle retry on short writes even with MSG_WAITALL
>>>>> as EINTR and other errors could cause them.
>>>>> What do you think?
>>> Any comment on this?
>>> IORING_SEND_NOTIF_USER_DATA could let us use
>>> notif->cqe.user_data = sqe->addr3;
>> I'd rather not use the last available u64, tbh, that was the
>> reason for not adding a second user_data in the first place.
> As far as I can see io_send_zc_prep has this:
>          if (unlikely(READ_ONCE(sqe->__pad2[0]) || READ_ONCE(sqe->addr3)))
>                  return -EINVAL;
> both are u64...

Hah, true, completely forgot about that one

Pavel Begunkov

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