Re: [dpdk-dev] [PATCH] net/bnxt: allow the mark to use a cfa code of zero

[Ajit Khaparde <ajit.khaparde@broadcom.com>]

On Wed, May 27, 2020 at 8:47 AM Ferruh Yigit <ferruh.yigit@intel.com> wrote:

> On 5/23/2020 12:55 AM, Mike Baucom wrote:
> > The mark code was too restrictive by disallowing a cfa_code of zero.
> > This code loosens the requirement and allows zero.
>
> I can see "if (cfa_code)" check removed, but can you please give some
> details
> that what it the impact of having that check and why change has been done.
>
> Also it is not clear what "cfa code" is, if it has a significance can you
> please
> describe it as well.
>
In the ingress path, the cfa_code field in Rx completion identifies the
CFA action rule that was used for the incoming packet. It is possible
that the packet could hit the rule at index 0 in the table.

The mark action code was too restrictive by disallowing a cfa_code of zero.
This code in the patch loosens the requirement and allows zero.

I will update the commit log with the same verbiage.

Thanks
Ajit


>
> >
> > Fixes: b87abb2e55cb ("net/bnxt: support marking packet")
> >
> > Signed-off-by: Mike Baucom <michael.baucom@broadcom.com>
> > Reviewed-by: Kishore Padmanabha <kishore.padmanabha@broadcom.com>
> > ---
> >  drivers/net/bnxt/bnxt_rxr.c | 20 +++++++++-----------
> >  1 file changed, 9 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/net/bnxt/bnxt_rxr.c b/drivers/net/bnxt/bnxt_rxr.c
> > index ee1acb1..91ff729 100644
> > --- a/drivers/net/bnxt/bnxt_rxr.c
> > +++ b/drivers/net/bnxt/bnxt_rxr.c
> > @@ -465,17 +465,15 @@ static inline struct rte_mbuf *bnxt_tpa_end(
> >               break;
> >       }
> >
> > -     if (cfa_code) {
> > -             rc = ulp_mark_db_mark_get(bp->ulp_ctx, gfid,
> > -                                       cfa_code, &mark_id);
> > -             if (!rc) {
> > -                     /* Got the mark, write it to the mbuf and return */
> > -                     mbuf->hash.fdir.hi = mark_id;
> > -                     mbuf->udata64 = (cfa_code & 0xffffffffull) << 32;
> > -                     mbuf->hash.fdir.id = rxcmp1->cfa_code;
> > -                     mbuf->ol_flags |= PKT_RX_FDIR | PKT_RX_FDIR_ID;
> > -                     return;
> > -             }
> > +     rc = ulp_mark_db_mark_get(bp->ulp_ctx, gfid,
> > +                               cfa_code, &mark_id);
> > +     if (!rc) {
> > +             /* Got the mark, write it to the mbuf and return */
> > +             mbuf->hash.fdir.hi = mark_id;
> > +             mbuf->udata64 = (cfa_code & 0xffffffffull) << 32;
> > +             mbuf->hash.fdir.id = rxcmp1->cfa_code;
> > +             mbuf->ol_flags |= PKT_RX_FDIR | PKT_RX_FDIR_ID;
> > +             return;
> >       }
> >
> >  skip_mark:
> >
>
>