netdev - Re: [PATCH v4 08/10] io_uring/cmd: Introduce SOCKET_URING_OP

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Date: Tue, 05 Sep 2023 08:24:25 -0400
From: Gabriel Krisman Bertazi <krisman@...e.de>
To: Breno Leitao <leitao@...ian.org>
Cc: sdf@...gle.com,  axboe@...nel.dk,  asml.silence@...il.com,
  willemdebruijn.kernel@...il.com,  martin.lau@...ux.dev,
  bpf@...r.kernel.org,  linux-kernel@...r.kernel.org,
  netdev@...r.kernel.org,  io-uring@...r.kernel.org,  kuba@...nel.org,
  pabeni@...hat.com
Subject: Re: [PATCH v4 08/10] io_uring/cmd: Introduce
 SOCKET_URING_OP_GETSOCKOPT

Breno Leitao <leitao@...ian.org> writes:

> Add support for getsockopt command (SOCKET_URING_OP_GETSOCKOPT), where
> level is SOL_SOCKET. This is leveraging the sockptr_t infrastructure,
> where a sockptr_t is either userspace or kernel space, and handled as
> such.
>
> Differently from the getsockopt(2), the optlen field is not a userspace
> pointers. In getsockopt(2), userspace provides optlen pointer, which is
> overwritten by the kernel.  In this implementation, userspace passes a
> u32, and the new value is returned in cqe->res. I.e., optlen is not a
> pointer.
>
> Important to say that userspace needs to keep the pointer alive until
> the CQE is completed.
>
> Signed-off-by: Breno Leitao <leitao@...ian.org>

IMO, this looks much cleaner with most of the bpf and socket logic under
net/.

Reviewed-by: Gabriel Krisman Bertazi <krisman@...e.de>

Thanks!


-- 
Gabriel Krisman Bertazi