[EXT] Re: [PATCH v5 2/2] app/testpmd: add command to process Rx metadata negotiation

[Thomas Monjalon]

27/01/2023 11:42, Nithin Kumar Dabilpuram:
> From: Thomas Monjalon <thomas at monjalon.net>
> > 27/01/2023 06:02, Nithin Kumar Dabilpuram:
> > > From: Thomas Monjalon <thomas at monjalon.net>
> > > > Ferruh is proposing to have a command "port config <port_id> ..."
> > > > to configure the flags to negotiate.
> > > > Are you OK with this approach?
> > >
> > > Yes, we are fine to have such command to enable and disable the feature
> > > with default being it disabled if supported by PMD.
> > > Is default being disabled fine if the feature is supported by a PMD ?
> > 
> > I think the default should be enabled for ease of use.
> 
> Since testpmd is used extensively for benchmarking purposes, we thought it should have minimum features
> enabled by default. The default testpmd doesn't have any Rx/Tx offloads enabled(except for FAST FREE),  default
> fwd mode being "iofwd" and the Rx metadata is only referenced when dumping packets.
> 
> 
> > Do we have similar features disables by default?
> > I mean do we know features in testpmd which require a "double enablement"
> > like one configuration command + one rte_flow rule?
> 
> Spec itself is that way i.e "RTE_FLOW_RULE + RX_METADATA_NEGOTIATE(once)"
> 
> Isn't it enough if 
> 
> #1 We have enough print when rte_flow is being create without negotiation done and ask user to enable rx metadata using
> "port config <port_id>..."
> #2 Provide testpmd app arg to enable Rx metadata(for example " --rx-metadata") like other features to avoid calling another
> command before rte flow create.

I'm not sure what is best.
I will let others discuss this part.