Re: [PATCH v5 0/5] io_uring/uring_cmd: allow non-iopoll cmds with IORING_SETUP_IOPOLL

[Jens Axboe]

On 3/16/26 4:14 PM, Jens Axboe wrote:
> 
> On Mon, 02 Mar 2026 10:29:09 -0700, Caleb Sander Mateos wrote:
>> Currently, creating an io_uring with IORING_SETUP_IOPOLL requires all
>> requests issued to it to support iopoll. This prevents, for example,
>> using ublk zero-copy together with IORING_SETUP_IOPOLL, as ublk
>> zero-copy buffer registrations are performed using a uring_cmd. There's
>> no technical reason why these non-iopoll uring_cmds can't be supported.
>> They will either complete synchronously or via an external mechanism
>> that calls io_uring_cmd_done(), io_uring_cmd_post_mshot_cqe32(), or
>> io_uring_mshot_cmd_post_cqe(), so they don't need to be polled.
>>
>> [...]
> 
> Applied, thanks!
> 
> [1/5] io_uring: add REQ_F_IOPOLL
>       commit: 9165dc4fa969b64c2d4396ee4e1546a719978dd1
> [2/5] io_uring: remove iopoll_queue from struct io_issue_def
>       commit: 7995be40deb3ab8b5df7bdf0621f33aa546aefa7
> [3/5] io_uring: count CQEs in io_iopoll_check()
>       commit: 3a5e96d47f7ea37fb6adf37882eec1521f8ca75e
> [4/5] io_uring/uring_cmd: allow non-iopoll cmds with IORING_SETUP_IOPOLL
>       commit: 23475637b0c47e5028817c9fd4dabe8f7409ca6c
> [5/5] nvme: remove nvme_dev_uring_cmd() IO_URING_F_IOPOLL check
>       commit: f144dbac4b177cfd026e417ab98da518ff3372cb

Caleb, want to send the liburing tests and documentation updates too?

-- 
Jens Axboe