[PATCH] event/cnxk: arm early to account for software delays

[Jerin Jacob]

On Tue, Dec 13, 2022 at 8:41 PM Shijith Thotton <sthotton at marvell.com> wrote:
>
> Arm a bucket early to account for software delays in timer arm routine.
>
> Signed-off-by: Shijith Thotton <sthotton at marvell.com>

Updated the git commit title as follows and applied to
dpdk-next-net-mrvl/for-next-net. Thanks


event/cnxk: arm timer early to account for software delays
> ---
>  drivers/event/cnxk/cnxk_tim_worker.h | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/event/cnxk/cnxk_tim_worker.h b/drivers/event/cnxk/cnxk_tim_worker.h
> index eda84c6f31..16909ef06d 100644
> --- a/drivers/event/cnxk/cnxk_tim_worker.h
> +++ b/drivers/event/cnxk/cnxk_tim_worker.h
> @@ -133,11 +133,13 @@ cnxk_tim_get_target_bucket(struct cnxk_tim_ring *const tim_ring,
>  {
>         const uint64_t bkt_cyc =
>                 tim_ring->tick_fn(tim_ring->tbase) - tim_ring->ring_start_cyc;
> -       uint64_t bucket =
> -               rte_reciprocal_divide_u64(bkt_cyc, &tim_ring->fast_div) +
> -               rel_bkt;
> +       uint64_t bucket = rte_reciprocal_divide_u64(bkt_cyc, &tim_ring->fast_div);
>         uint64_t mirr_bucket = 0;
>
> +       if ((bkt_cyc - bucket * tim_ring->tck_int) < tim_ring->tck_int / 2)
> +               bucket--;
> +
> +       bucket += rel_bkt;
>         bucket = cnxk_tim_bkt_fast_mod(bucket, tim_ring->nb_bkts,
>                                        tim_ring->fast_bkt);
>         mirr_bucket =
> --
> 2.25.1
>