Re: [dpdk-dev] [PATCH] bnxt: skip getting statistics for queues not started

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

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On Wed, Apr 21, 2021 at 4:09 PM Stephen Hemminger
<stephen@networkplumber.org> wrote:
>
> An application using rte_flow may define a large number of queues
> but only use a small subset of them at any one time.
>
> Since querying the status of each queue requires a request/spin/reply
> with the firmware, optimize by skipping the request for queues not running.
> For those queues the statistics will be 0.
>
> This cuts the cost of single xstats query in half and has even
> bigger gain for simple stats query.
>
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Changed the commit headline to
"net/bnxt: skip get statistics for stopped queues"
Patch applied to dpdk-next-net-brcm. Thanks

> ---
>  drivers/net/bnxt/bnxt_stats.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/net/bnxt/bnxt_stats.c b/drivers/net/bnxt/bnxt_stats.c
> index bb4b2eee194e..11767e06d074 100644
> --- a/drivers/net/bnxt/bnxt_stats.c
> +++ b/drivers/net/bnxt/bnxt_stats.c
> @@ -528,6 +528,8 @@ int bnxt_stats_get_op(struct rte_eth_dev *eth_dev,
>                 struct bnxt_rx_queue *rxq = bp->rx_queues[i];
>                 struct bnxt_cp_ring_info *cpr = rxq->cp_ring;
>
> +               if (!rxq->rx_started)
> +                       continue;
>                 rc = bnxt_hwrm_ctx_qstats(bp, cpr->hw_stats_ctx_id, i,
>                                      bnxt_stats, 1);
>                 if (unlikely(rc))
> @@ -543,6 +545,8 @@ int bnxt_stats_get_op(struct rte_eth_dev *eth_dev,
>                 struct bnxt_tx_queue *txq = bp->tx_queues[i];
>                 struct bnxt_cp_ring_info *cpr = txq->cp_ring;
>
> +               if (!txq->tx_started)
> +                       continue;
>                 rc = bnxt_hwrm_ctx_qstats(bp, cpr->hw_stats_ctx_id, i,
>                                      bnxt_stats, 0);
>                 if (unlikely(rc))
> --
> 2.30.2
>