[ovs-discuss] Is a new field in flow.h necessary for matching on a custom v6 extension header?

Ben Pfaff blp at ovn.org
Fri Feb 23 18:22:29 UTC 2018

Ultimately, I expect a P4-based solution, in which the controller
supplies a P4 program that extracts the fields that it is interested in.
This is my big project for OVS 2.10.  (I don't know how successful I'll
be yet.)

On Fri, Feb 23, 2018 at 12:37:40AM +0100, Alan Kayahan wrote:
> I understand that there must be a construct in the struct flow, and
> introducing a new be32 will save the day for me. However looking at this
> from a broader perspective, say matching on the fields of any v6 extension
> header made into the OF specification, neither adding individual fields nor
> adding every v6 extension header into the struct flow looks elegant to me.
> What do you think?
> 2018-02-21 17:10 GMT+01:00 Ben Pfaff <blp at ovn.org>:
> > On Mon, Feb 19, 2018 at 06:15:30PM +0100, Alan Kayahan wrote:
> > > I have a custom v6 extension header, in which I would like to perform an
> > > LPM match on only one 32bit field.
> > >
> > > Since an extension header is technically not a new field, do I still need
> > > to introduce anything in the struct flow?
> >
> > Without anything in struct flow, how do you propose to match on it?
> >

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