netdev - Re: AIO operation and CMSG

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Date:   Thu, 18 Jan 2018 08:32:16 +0100
From:   Stephan Mueller <smueller@...onox.de>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-aio@...ck.org, netdev@...r.kernel.org
Subject: Re: AIO operation and CMSG

Am Mittwoch, 17. Januar 2018, 20:22:13 CET schrieb Christoph Hellwig:

Hi Christoph,

> On Sun, Jan 14, 2018 at 09:01:00AM +0100, Stephan Müller wrote:
> > The syscall io_submit sends data to the kernel and invokes the respective
> > handler function in the kernel such as the recvmsg handler. What I am
> > wondering is whether there is a way to send CMSG data along with the
> > io_submit syscall? If not, is CMSG handling with the AIO syscalls
> > possible at all?
> Not as-is, but it could be easily added by repurposing unused fields
> in the iocb.  The big question is if it should be done to the existing
> IOCB_CMD_PREADV/IOCB_CMD_PWRITEV types, or if new SENDMSG/RECVMSG ones
> should be added instead.

Thank you for the clarification. I think for the moment we have found another 
solution that we are discussing at linux-crypto. Therefore, I would currently 
not see the need for an additional support of CMSG in AIO.

Ciao
Stephan