Re: [PATCH v2] event/cnxk: wait for CPT flow control on WQE path

[Jerin Jacob <jerinjacobk@gmail.com>]

On Thu, Jan 19, 2023 at 11:23 AM Rahul Bhansali <rbhansali@marvell.com> wrote:
>
> This is to avoid CPT queue overflow and thereby a CPT misc
> interrupt.
>
> Fixes: 1a7da795f64 ("net/cnxk: support Tx security offload on cn9k")
>
> Signed-off-by: Rahul Bhansali <rbhansali@marvell.com>

Acked-by: Jerin Jacob <jerinj@marvell.com>


> ---
> Changes in v2: Updated commit message.
>
>  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 54213db3b4..1ce4b044e8 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 17bbdce3a0..b4ef45d65c 100644
> --- a/drivers/net/cnxk/cn9k_tx.h
> +++ b/drivers/net/cnxk/cn9k_tx.h
> @@ -411,6 +411,16 @@ 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
>