[zeromq-dev] Setting 802.1p VLAN Priority

Luca Boccassi luca.boccassi at gmail.com
Mon Nov 9 23:59:45 CET 2020


As with all socket options, it's possible to set it, just nobody has
needed it before. Just send a PR.

On Mon, 9 Nov 2020 at 19:34, Arnaud Loonstra <arnaud at sphaero.org> wrote:
>
> I guess you didn't get a reply just yet. I don't go very deep into the
> core of libzmq. It seems you already had look yourself. I'm not aware of
> a socket option you are looking for but we welcome a patch that
> implements it?
>
> Perhaps some of the other maintainers can shred a light on whether this
> is already possible in libzmq or why not.
>
> Rg,
>
> Arnaud
>
> On 06-11-2020 15:46, Andy Heroff via zeromq-dev wrote:
> > Hi,
> >
> >     We use 0MQ for messaging between applications across various VLANs
> > within our system. Recently, we have added a requirement in which we
> > would like to set the 802.1p priority field to something other than 0
> > for a subset of these connections (most, but not all). There doesn't
> > appear to be any method exposed to directly change the priority of the
> > 0MQ socket (e.g. setsockopt for SOL_SOCKET/SO_PRIORITY which would set
> > the sk_priority field, and then get translated by egress-qos-map on the
> > outbound link) within 0MQ.
> >
> >     ZMQ_TOS is close, but by my understanding, that relies on (for us on
> > top of Linux at least) a pre-determined mapping in the kernel and
> > calculations based on DSCP values. Also, it doesn't appear to offer a
> > mapping to the value of 3 which we're trying to set, even if we tried
> > that route.
> >
> >     As a temporary solution, we created a quick patch on top of ZMQ to
> > allow directly setting the SO_PRIORITY via a new option in
> > zmq::options_t::setsockopt, but it would be easier, of course, if we
> > didn't have to patch 0MQ to accompish this end. Is there another method
> > to set sk_priority directly via already existing 0MQ methods that I'm
> > unaware of?
> >
> >     Thanks in advance!
> >
> > --- Andy
> >
> > _______________________________________________
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> > zeromq-dev at lists.zeromq.org
> > https://lists.zeromq.org/mailman/listinfo/zeromq-dev
> >
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