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

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Date:   Tue, 11 Apr 2023 08:36:50 -0600
From:   David Ahern <dsahern@...nel.org>
To:     Breno Leitao <leitao@...ian.org>
Cc:     Willem de Bruijn <willemb@...gle.com>, 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,
        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 4/11/23 6:00 AM, Breno Leitao wrote:
> I am not sure if avoiding io_uring details in network code is possible.
> 
> The "struct proto"->uring_cmd callback implementation (tcp_uring_cmd()
> in the TCP case) could be somewhere else, such as in the io_uring/
> directory, but, I think it might be cleaner if these implementations are
> closer to function assignment (in the network subsystem).
> 
> And this function (tcp_uring_cmd() for instance) is the one that I am
> planning to map io_uring CMDs to ioctls. Such as SOCKET_URING_OP_SIOCINQ
> -> SIOCINQ.
> 
> Please let me know if you have any other idea in mind.

I am not convinced that this io_uring_cmd is needed. This is one
in-kernel subsystem calling into another, and there are APIs for that.
All of this set is ioctl based and as Willem noted a little refactoring
separates the get_user/put_user out so that in-kernel can call can be
made with existing ops.