netdev - Re: [PATCH net-next v2 5/9] nfp: extend flower matching capabilities

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Date:   Thu, 29 Jun 2017 17:00:06 +0200
From:   Simon Horman <simon.horman@...ronome.com>
To:     Or Gerlitz <gerlitz.or@...il.com>
Cc:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Linux Netdev List <netdev@...r.kernel.org>,
        oss-drivers@...ronome.com,
        Pieter Jansen van Vuuren 
        <pieter.jansenvanvuuren@...ronome.com>
Subject: Re: [PATCH net-next v2 5/9] nfp: extend flower matching capabilities

On Thu, Jun 29, 2017 at 05:33:32PM +0300, Or Gerlitz wrote:
> On Wed, Jun 28, 2017 at 11:29 PM, Simon Horman
> <simon.horman@...ronome.com> wrote:
> > +nfp_flower_compile_meta_tci(struct nfp_flower_meta_two *frame,
> > +                           struct tc_cls_flower_offload *flow, u8 key_type,
> > +                           bool mask_version)
> 
> what's the role of the mask_version flag here and elsewhere in the
> sister functions?

Hi Or,

I chatted with Pieter about this and my understanding is that metadata
comes in pairs; masked and umasked. The mask_version parameter controls
which of the pair is compiled.

> 
> > +{
> > +       struct flow_dissector_key_vlan *flow_vlan;
> > +       u16 tmp_tci;
> > +
> > +       /* Populate the metadata frame. */
> > +       frame->nfp_flow_key_layer = key_type;
> > +       frame->mask_id = ~0;
> > +
> > +       if (mask_version) {
> > +               frame->tci = cpu_to_be16(~0);
> > +               return;
> > +       }
> > +