Re: [PATCH 2/2] nbd/server: Allow users to adjust handshake limit in QMP

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On Thu, Feb 06, 2025 at 10:20:09AM +0300, Vladimir Sementsov-Ogievskiy wrote:
> > ---
> >   qapi/block-export.json         | 10 ++++++++++
> >   include/block/nbd.h            |  6 +++---
> 
> [..]
> 
> > @@ -52,6 +57,10 @@
> >   #
> >   # @addr: Address on which to listen.
> >   #
> > +# @handshake-max-secs: Time limit, in seconds, at which a client that
> > +#     has not completed the negotiation handshake will be disconnected,
> > +#     or 0 for no limit (since 10.0; default: 10).
> > +#
> 
> Hmm. [not about the series], shouldn't we finally deprecate older interface?

By older interface, you are asking about the QMP command
'nbd-server-start' as compared to struct NbdServerOptions.  But the
struct is not directly present in any QMP commands; rather, it only
appears to be used by qemu-storage-daemon as one of its command line
options that needs to set up an NBD server with a JSON-like syntax
that has less nesting than QMP nbd-server-start.  blockdev-nbd.c has
two functions [nbd_server_start_options(NbdServerOPtions *arg...)  and
qmp_nbd_server_start(args...)] that both unpack their slightly
different forms and pass them as parameters to nbd_server_start() that
is then agnostic to whether the older QMP command or newer q-s-d CLI
option was specified.

It looks like libvirt is still using QMP nbd-server-start.  If we were
to start the deprecation process for qemu 10.0, what would the new
command look like?  What would everyone be required to use by qemu
10.2?

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.
Virtualization:  qemu.org | libguestfs.org



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