linux-kernel - Re: [PATCH] io_uring: Add io_uring command support for sockets

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Message-ID: <ZJRijTDv5lUsVo+j@gmail.com>
Date:   Thu, 22 Jun 2023 08:02:37 -0700
From:   Breno Leitao <leitao@...ian.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Jonathan Corbet <corbet@....net>, Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, leit@...a.com,
        Arnd Bergmann <arnd@...db.de>,
        Steve French <stfrench@...rosoft.com>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Simon Ser <contact@...rsion.fr>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:IO_URING" <io-uring@...r.kernel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>
Subject: Re: [PATCH] io_uring: Add io_uring command support for sockets

On Thu, Jun 22, 2023 at 07:20:48AM +0200, Greg Kroah-Hartman wrote:
> On Wed, Jun 21, 2023 at 04:21:26PM -0700, Breno Leitao wrote:
> > Enable io_uring commands on network sockets. Create two new
> > SOCKET_URING_OP commands that will operate on sockets. Since these
> > commands are similar to ioctl, uses the _IO{R,W} helpers to embedded the
> > argument size and operation direction. Also allocates a unused ioctl
> > chunk for uring command usage.
> > 
> > In order to call ioctl on sockets, use the file_operations->uring_cmd
> > callbacks, and map it to a uring socket function, which handles the
> > SOCKET_URING_OP accordingly, and calls socket ioctls.
> > 
> > This patches was tested by creating a new test case in liburing.
> > Link: https://github.com/leitao/liburing/commit/3340908b742c6a26f662a0679c4ddf9df84ef431
> > 
> > Signed-off-by: Breno Leitao <leitao@...ian.org>
> > ---
> 
> Isn't this a new version of an older patch?

Yes, this should have tagged as V2.

[1] https://lore.kernel.org/lkml/20230406144330.1932798-1-leitao@debian.org/#r

> > --- a/Documentation/userspace-api/ioctl/ioctl-number.rst
> > +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
> > @@ -361,6 +361,7 @@ Code  Seq#    Include File                                           Comments
> >  0xCB  00-1F                                                          CBM serial IEC bus in development:
> >                                                                       <mailto:michael.klein@...fin.lb.shuttle.de>
> >  0xCC  00-0F  drivers/misc/ibmvmc.h                                   pseries VMC driver
> > +0xCC  A0-BF  uapi/linux/io_uring.h                                   io_uring cmd subsystem
> 
> This change is nice, but not totally related to this specific one,
> shouldn't it be separate?

This is related to this patch, since I am using it below, in the
following part:

	+#define SOCKET_URING_OP_SIOCINQ _IOR(0xcc, 0xa0, int)
	+#define SOCKET_URING_OP_SIOCOUTQ _IOR(0xcc, 0xa1, int)

Should I have a different patch, even if they are related?

> > +EXPORT_SYMBOL_GPL(uring_sock_cmd);
> 
> Did you forget the "io_" prefix?

Yes, I will rename the function.

Thanks for the review.