linux-kernel - Re: [PATCH 0/5] add initial io_uring

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Message-ID: <ZC72UKx/sA4syPfK@kbusch-mbp.dhcp.thefacebook.com>
Date:   Thu, 6 Apr 2023 10:41:52 -0600
From:   Keith Busch <kbusch@...nel.org>
To:     Breno Leitao <leitao@...ian.org>
Cc:     io-uring@...r.kernel.org, netdev@...r.kernel.org, kuba@...nel.org,
        asml.silence@...il.com, axboe@...nel.dk, leit@...com,
        edumazet@...gle.com, pabeni@...hat.com, davem@...emloft.net,
        dccp@...r.kernel.org, mptcp@...ts.linux.dev,
        linux-kernel@...r.kernel.org, dsahern@...nel.org,
        willemdebruijn.kernel@...il.com, matthieu.baerts@...sares.net,
        marcelo.leitner@...il.com
Subject: Re: [PATCH 0/5] add initial io_uring_cmd support for sockets

On Thu, Apr 06, 2023 at 07:43:26AM -0700, Breno Leitao wrote:
> This patchset creates the initial plumbing for a io_uring command for
> sockets.
> 
> For now, create two uring commands for sockets, SOCKET_URING_OP_SIOCOUTQ
> and SOCKET_URING_OP_SIOCINQ. They are similar to ioctl operations
> SIOCOUTQ and SIOCINQ. In fact, the code on the protocol side itself is
> heavily based on the ioctl operations.

Do you have asynchronous operations in mind for a future patch? The io_uring
command infrastructure makes more sense for operations that return EIOCBQUEUED,
otherwise it doesn't have much benefit over ioctl.
 
> In order to test this code, I created a liburing test, which is
> currently located at [1], and I will create a pull request once we are
> good with this patch.
> 
> I've also run test/io_uring_passthrough to make sure the first patch
> didn't regressed the NVME passthrough path.
> 
> This patchset is a RFC for two different reasons:
>   * It changes slighlty on how IO uring command operates. I.e, we are
>     now passing the whole SQE to the io_uring_cmd callback (instead of
>     an opaque buffer). This seems to be more palatable instead of
>     creating some custom structure just to fit small parameters, as in
>     SOCKET_URING_OP_SIOC{IN,OUT}Q. Is this OK?

I think I'm missing something from this series. Where is the io_uring_cmd
change to point to the sqe?