[PATCH 2/2] net/cnxk: avoid NPC Rx and MCAM entries disable

[Jerin Jacob]

On Thu, Jun 27, 2024 at 2:47 PM Rahul Bhansali <rbhansali at marvell.com> wrote:
>
> For inline IPsec, Rx misses are observed during dev stop process.
> There can be a situation of 2nd pass packets are being dropped and
> can cause a buffer leak.
> To handle such case, will avoid NPC Rx and MCAM entries disable in
> dev stop. These will be handled in dev close routine.
>
> Signed-off-by: Rahul Bhansali <rbhansali at marvell.com>

Since it is a fix, Please send the next version with Fixes: tag and
update git commit to make as fix.


> ---
>  drivers/net/cnxk/cnxk_ethdev.c | 27 ++++++++++++++++++++-------
>  1 file changed, 20 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/cnxk/cnxk_ethdev.c b/drivers/net/cnxk/cnxk_ethdev.c
> index db8feca620..38746c81c5 100644
> --- a/drivers/net/cnxk/cnxk_ethdev.c
> +++ b/drivers/net/cnxk/cnxk_ethdev.c
> @@ -1625,18 +1625,26 @@ cnxk_nix_dev_stop(struct rte_eth_dev *eth_dev)
>         int count, i, j, rc;
>         void *rxq;
>
> -       /* Disable all the NPC entries */
> -       rc = roc_npc_mcam_enable_all_entries(&dev->npc, 0);
> -       if (rc)
> -               return rc;
> +       /* In case of Inline IPSec, will need to avoid disabling the MCAM rules and NPC Rx
> +        * in this routine to continue processing of second pass inflight packets if any.
> +        * Drop of second pass packets will leak first pass buffers on some platforms
> +        * due to hardware limitations.
> +        */
> +       if (roc_feature_nix_has_second_pass_drop() ||
> +           !(dev->rx_offloads & RTE_ETH_RX_OFFLOAD_SECURITY)) {
> +               /* Disable all the NPC entries */
> +               rc = roc_npc_mcam_enable_all_entries(&dev->npc, 0);
> +               if (rc)
> +                       return rc;
> +
> +               /* Disable Rx via NPC */
> +               roc_nix_npc_rx_ena_dis(&dev->nix, false);
> +       }
>
>         /* Stop link change events */
>         if (!roc_nix_is_vf_or_sdp(&dev->nix))
>                 roc_nix_mac_link_event_start_stop(&dev->nix, false);
>
> -       /* Disable Rx via NPC */
> -       roc_nix_npc_rx_ena_dis(&dev->nix, false);
> -
>         roc_nix_inl_outb_soft_exp_poll_switch(&dev->nix, false);
>
>         /* Stop inline device RQ first */
> @@ -2047,6 +2055,11 @@ cnxk_eth_dev_uninit(struct rte_eth_dev *eth_dev, bool reset)
>         /* Clear the flag since we are closing down */
>         dev->configured = 0;
>
> +       /* Disable all the NPC entries */
> +       rc = roc_npc_mcam_enable_all_entries(&dev->npc, 0);
> +       if (rc)
> +               return rc;
> +
>         roc_nix_npc_rx_ena_dis(nix, false);
>
>         /* Restore 802.3 Flow control configuration */
> --
> 2.25.1
>