Re: [PATCH v2 3/7] net/bnxt: fix race-condition when report error recovery

[Ajit Khaparde <ajit.khaparde@broadcom.com>]

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On Fri, Oct 20, 2023 at 3:11 AM Chengwen Feng <fengchengwen@huawei.com> wrote:
>
> If set data path functions to dummy functions before reports error
> recovering event, there maybe a race-condition with data path threads,
> this patch fixes it by setting data path functions to dummy functions
> only after reports such event.
>
> Fixes: e11052f3a46f ("net/bnxt: support proactive error handling mode")
> Cc: stable@dpdk.org
>
> Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
> Acked-by: Konstantin Ananyev <konstantin.ananyev@huawei.com>
Acked-by: Ajit Khaparde <ajit.khaparde@broadcom.com>

> ---
>  drivers/net/bnxt/bnxt_cpr.c    | 13 +++++++------
>  drivers/net/bnxt/bnxt_ethdev.c |  4 ++--
>  2 files changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/bnxt/bnxt_cpr.c b/drivers/net/bnxt/bnxt_cpr.c
> index 0733cf4df2..d8947d5b5f 100644
> --- a/drivers/net/bnxt/bnxt_cpr.c
> +++ b/drivers/net/bnxt/bnxt_cpr.c
> @@ -168,14 +168,9 @@ void bnxt_handle_async_event(struct bnxt *bp,
>                 PMD_DRV_LOG(INFO, "Port conn async event\n");
>                 break;
>         case HWRM_ASYNC_EVENT_CMPL_EVENT_ID_RESET_NOTIFY:
> -               /*
> -                * Avoid any rx/tx packet processing during firmware reset
> -                * operation.
> -                */
> -               bnxt_stop_rxtx(bp->eth_dev);
> -
>                 /* Ignore reset notify async events when stopping the port */
>                 if (!bp->eth_dev->data->dev_started) {
> +                       bnxt_stop_rxtx(bp->eth_dev);
>                         bp->flags |= BNXT_FLAG_FATAL_ERROR;
>                         return;
>                 }
> @@ -184,6 +179,12 @@ void bnxt_handle_async_event(struct bnxt *bp,
>                                              RTE_ETH_EVENT_ERR_RECOVERING,
>                                              NULL);
>
> +               /*
> +                * Avoid any rx/tx packet processing during firmware reset
> +                * operation.
> +                */
> +               bnxt_stop_rxtx(bp->eth_dev);
> +
>                 pthread_mutex_lock(&bp->err_recovery_lock);
>                 event_data = data1;
>                 /* timestamp_lo/hi values are in units of 100ms */
> diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
> index 5c4d96d4b1..003a6eec11 100644
> --- a/drivers/net/bnxt/bnxt_ethdev.c
> +++ b/drivers/net/bnxt/bnxt_ethdev.c
> @@ -4616,14 +4616,14 @@ static void bnxt_check_fw_health(void *arg)
>         bp->flags |= BNXT_FLAG_FATAL_ERROR;
>         bp->flags |= BNXT_FLAG_FW_RESET;
>
> -       bnxt_stop_rxtx(bp->eth_dev);
> -
>         PMD_DRV_LOG(ERR, "Detected FW dead condition\n");
>
>         rte_eth_dev_callback_process(bp->eth_dev,
>                                      RTE_ETH_EVENT_ERR_RECOVERING,
>                                      NULL);
>
> +       bnxt_stop_rxtx(bp->eth_dev);
> +
>         if (bnxt_is_primary_func(bp))
>                 wait_msec = info->primary_func_wait_period;
>         else
> --
> 2.17.1
>

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