Re: [dpdk-dev] [PATCH v2 2/3] eal: add new rte color definition

["Ananyev, Konstantin" <konstantin.ananyev@intel.com>]

> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas@monjalon.net]
> Sent: Tuesday, December 18, 2018 1:39 PM
> To: Dumitrescu, Cristian <cristian.dumitrescu@intel.com>
> Cc: Pattan, Reshma <reshma.pattan@intel.com>; dev@dpdk.org; Ananyev, Konstantin <konstantin.ananyev@intel.com>;
> jerin.jacob@caviumnetworks.com; Singh, Jasvinder <jasvinder.singh@intel.com>; david.marchand@redhat.com; olivier.matz@6wind.com
> Subject: Re: [dpdk-dev] [PATCH v2 2/3] eal: add new rte color definition
> 
> 18/12/2018 14:19, Dumitrescu, Cristian:
> > From: Thomas Monjalon [mailto:thomas@monjalon.net]
> > > 18/12/2018 12:18, Dumitrescu, Cristian:
> > > > > > I replied in v3 that it should stay in rte_meter.h.
> > > > > > You can include rte_meter.h in ethdev.
> > > > >
> > > > > OK, thanks Thomas, makes sense to me as well.
> > > > >
> > > >
> > > > Thomas,
> > > >
> > > > I agree with your input, but just want to make sure we are on the same
> > > page:
> > > >
> > > > Besides including rte_meter.h in ethdev (which you are fine with), we
> > > would also need to include rte_meter.h in mbuf.
> > > >
> > > > Are you OK with this as well?
> > >
> > > Why do we need rte_meter.h in mbuf?
> > >
> >
> > You probably looked at V2 only, but in V3 we have functions to set/get the color within the mbuf->hash.sched field.
> >
> > For space compression reasons, the mbuf->hash.sched stores the color on 8-bit variable, while for the outside world the set/get functions
> work with the 32-bit enum type. We do same thing in other places in DPDK, such as rte_crypto_op, etc.
> 
> So it's a different discussion.
> We need to review this v3 and check how relevant this mbuf API is.
> 
> If the API is accepted, yes the include should not be an issue.

Personally, I don't think it is a good idea to add extra dependency for librte_mbuf.
I'd prefer either to keep rte_color definition inside librte_mbuf,
or move corresponding function definitions out of it.
Konstantin