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Date:   Tue, 11 Apr 2023 08:36:50 -0600
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Subject: Re: [PATCH 0/5] add initial io_uring_cmd support for sockets
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To:     Breno Leitao <leitao@debian.org>
Cc:     Willem de Bruijn <willemb@google.com>, io-uring@vger.kernel.org,
        netdev@vger.kernel.org, kuba@kernel.org, asml.silence@gmail.com,
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        pabeni@redhat.com, davem@davemloft.net, dccp@vger.kernel.org,
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        willemdebruijn.kernel@gmail.com, matthieu.baerts@tessares.net,
        marcelo.leitner@gmail.com
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From:   David Ahern <dsahern@kernel.org>
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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.