Re: [PATCH] event/cnxk: wait for CPT fc on wqe path

[Jerin Jacob <jerinjacobk@gmail.com>]

On Fri, Dec 9, 2022 at 7:11 PM Rahul Bhansali <rbhansali@marvell.com> wrote:
>
> Wait for CPT flow control on WQE path.

Please add Why? If it is bug add Fixes:

Also change the subject as event/cnxk: wait for CPT flow control on WQE path

>
> Signed-off-by: Rahul Bhansali <rbhansali@marvell.com>
> ---
>  drivers/event/cnxk/cn9k_worker.h |  1 +
>  drivers/net/cnxk/cn9k_tx.h       | 10 ++++++++++
>  2 files changed, 11 insertions(+)
>
> diff --git a/drivers/event/cnxk/cn9k_worker.h b/drivers/event/cnxk/cn9k_worker.h
> index 4c3932da47..d3c5180fbc 100644
> --- a/drivers/event/cnxk/cn9k_worker.h
> +++ b/drivers/event/cnxk/cn9k_worker.h
> @@ -730,6 +730,7 @@ cn9k_sso_hws_xmit_sec_one(const struct cn9k_eth_txq *txq, uint64_t base,
>
>         rte_io_wmb();
>         cn9k_sso_txq_fc_wait(txq);
> +       cn9k_nix_sec_fc_wait_one(txq);
>
>         /* Write CPT instruction to lmt line */
>         vst1q_u64(lmt_addr, cmd01);
> diff --git a/drivers/net/cnxk/cn9k_tx.h b/drivers/net/cnxk/cn9k_tx.h
> index 404edd6aed..7362025a34 100644
> --- a/drivers/net/cnxk/cn9k_tx.h
> +++ b/drivers/net/cnxk/cn9k_tx.h
> @@ -388,6 +388,16 @@ cn9k_nix_xmit_prep_lmt(uint64_t *cmd, void *lmt_addr, const uint32_t flags)
>         roc_lmt_mov(lmt_addr, cmd, cn9k_nix_tx_ext_subs(flags));
>  }
>
> +static __rte_always_inline void
> +cn9k_nix_sec_fc_wait_one(const struct cn9k_eth_txq *txq)
> +{
> +       uint64_t nb_desc = txq->cpt_desc;
> +       uint64_t *fc = txq->cpt_fc;
> +
> +       while (nb_desc <= __atomic_load_n(fc, __ATOMIC_RELAXED))
> +               ;
> +}
> +
>  static __rte_always_inline uint64_t
>  cn9k_nix_xmit_submit_lmt(const rte_iova_t io_addr)
>  {
> --
> 2.25.1
>