Re: [netmod] "uint24" in rfc6991-bis?

tom petch <ietfc@btconnect.com> Mon, 27 April 2020 11:08 UTC

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From: tom petch <ietfc@btconnect.com>
To: Martin Björklund <mbj+ietf@4668.se>, "rwilton=40cisco.com@dmarc.ietf.org" <rwilton=40cisco.com@dmarc.ietf.org>
CC: "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: [netmod] "uint24" in rfc6991-bis?
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Date: Mon, 27 Apr 2020 11:07:56 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/yKgZpXp6Hzsgj0ZbWuUDmSEEcls>
Subject: Re: [netmod] "uint24" in rfc6991-bis?
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From: netmod <netmod-bounces@ietf.org> on behalf of Martin Björklund <mbj+ietf@4668.se>
Sent: 23 April 2020 10:57

"Rob Wilton \(rwilton\)" <rwilton=40cisco.com@dmarc.ietf.org> wrote:
> [As an individual contributor]
>
> > -----Original Message-----
> > From: netmod <netmod-bounces@ietf.org> On Behalf Of Juergen
> > Schoenwaelder
> > Sent: 22 April 2020 23:09
> > To: Robert Varga <nite@hq.sk>
> > Cc: netmod@ietf.org
> > Subject: Re: [netmod] "uint24" in rfc6991-bis?
> >
> > On Wed, Apr 22, 2020 at 11:17:26PM +0200, Robert Varga wrote:
> > > Hello,
> > >
> > > a number of IETF protocols-and-whatnots are operating on unsigned
> > > 24bit (or 3-octet) entities. For example:
> > >
> > > https://tools.ietf.org/html/rfc7471#section-4.1.5
> > > https://tools.ietf.org/html/rfc7471#section-4.4.5
> > > SRGB range start/length in https://tools.ietf.org/html/rfc8669
> >
> > For these use cases, it might be also a good idea to define types that
> > capture the additional semantics. SRGB seems to consist of two 24-bit
> > values - I can't tell whether it makes sense to model this 6-octet
> > value
> > as two 3-octet values in YANG.
> >
> > > I wonder whether it would make sense to provide something like:
> > >
> > > type uint24 {
> > >    type uint32;
> > >    range 0..16777215;
> > > }
> > >
> > > in ietf-inet-types as a common base type for such definitions.
> >
> > If we add such a definition, it likely should go into ietf-yang-types.
> [RW]
>
> I would find this type somewhat confusing in the sense that it mixing
> the underlying YANG datatype with the range of the value space,

I agree.

> e.g., I don't think of uint8 as
> type uint8 {
>    type uint32;
>    range 0..255;
> }
>
> because the encoding is allowed to be different.  Perhaps having a
> slightly different name would help avoid possible confusion with the
> built in types?

Then the question is if it really is so common so that we need a type
in ietf-yang-types for this.

<tp>

I think not.  As Juergen said, where there is a 24 bit quantity, there are probably other semantics e.g. meaning of the maximum and minimum values comes to mind - and so a more specific type for that application seems a better idea.

Tom Petch
 
/martin


>
> Regards,
> Rob
>
>
> >
> > /js
> >
> > --
> > Juergen Schoenwaelder           Jacobs University Bremen gGmbH
> > Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
> > Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>
> >
> > _______________________________________________
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> > netmod@ietf.org
> > https://www.ietf.org/mailman/listinfo/netmod
>
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