Re: First kernel version with uring sockets support

[Dmitry Sychov <dmitry.sychov@gmail.com>]

> You mean the one in liburing?

I'am referring to
https://github.com/frevib/io_uring-echo-server/blob/master/src/include/liburing/io_uring.h
with sockets OPs as the latest interface reference, thinking it will
help the io_uring newcomers if
IORING_OP_* lines will have corresponding comments of the minimum
kernel requirement for now and the future.

For example I was almost totally sure that sockets were the first
uring-supported thing.

> Yeah, you'll need 5.5 for that.

I see, thanks :)

On Wed, Jan 22, 2020 at 9:11 PM Jens Axboe <axboe@kernel.dk> wrote:
>
> On 1/22/20 11:08 AM, Dmitry Sychov wrote:
> > It's unclear starting from what version the kernel and headers
> > were updated with sockets support(IORING_OP_ACCEPT etc).
> >
> > I just checked today 2020/01/22 Focal Rossa Ubuntu and the last OP is
> > only IORING_OP_TIMEOUT (still on kernel 5.4.0-12) ;(
>
> Yeah, you'll need 5.5 for that.
>
> > So maybe it's a good idea to comment-update every io_uring.h OP with
> > minimum kernel version requirement...
>
> You mean the one in liburing?
>
> > p.s. Not every Linux user is a kernel hacker ;)
>
> Definitely! This will be solved with 5.6 that introduces a probe
> command, so you can query the running kernel for what opcodes it
> supports. For now, it's not that easy, unfortunately...
>
> --
> Jens Axboe
>