Re: [dpdk-dev] [PATCH] net/bnxt: fix to reset Rx next consumer index

[Somnath Kotur <somnath.kotur@broadcom.com>]

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Thank you Ferruh, have sent V2 with updated commit log, please see if it
sounds good now?

-Som

On Fri, Aug 20, 2021 at 6:17 PM Ferruh Yigit <ferruh.yigit@intel.com> wrote:

> On 8/10/2021 7:07 AM, Somnath Kotur wrote:
> > In bnxt_init_one_rx_ring(), reset this variable internal to the driver
> > ring to 0, so that there is no mismatch with actual value in HW on
> > traffic resumption.
> >
>
> Hi Somnath,
>
> What is the impact of the patch, what are you fixing?
>
> If the 'rx_next_cons' (next consumer index) is not matching with HW value,
> what
> happens, does the Rx fails completely and unrecoverable? Or does miss one
> or
> more packet?
>
> And when/how this happens, since driver is not new I assume this doesn't
> happen
> in first ring init. Does this happen after uninit and init again?
> Providing this
> information helps clarifying scope of the fix.
>
> Can you please send a new version with updated commit log?
>
> Thanks,
> ferruh
>
> > Fixes: 03c8f2fe111c ("net/bnxt: detect bad opaque in Rx completion")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
> > Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
> > Reviewed-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
> > ---
> >  drivers/net/bnxt/bnxt_rxr.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/net/bnxt/bnxt_rxr.c b/drivers/net/bnxt/bnxt_rxr.c
> > index aea71703d1..73fbdd17d1 100644
> > --- a/drivers/net/bnxt/bnxt_rxr.c
> > +++ b/drivers/net/bnxt/bnxt_rxr.c
> > @@ -1379,6 +1379,9 @@ int bnxt_init_one_rx_ring(struct bnxt_rx_queue
> *rxq)
> >       }
> >       PMD_DRV_LOG(DEBUG, "TPA alloc Done!\n");
> >
> > +     /* Explicitly reset this driver internal tracker on a ring init */
> > +     rxr->rx_next_cons = 0;
> > +
> >       return 0;
> >  }
> >
> >
>
>