Re: [dpdk-dev] [PATCH 2/2] net/bnxt: cap max Rx rings for Thor

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

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On Mon, Apr 19, 2021 at 12:28 PM Ajit Khaparde
<ajit.khaparde@broadcom.com> wrote:
>
> For Thor devices, RSS table can only accommodate 512 Rx queues.
> When RSS is enabled, Cap the max Rx rings to 512.
> For non-RSS case, the number will be limited by number of VNICs.
>
> Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
> Reviewed-by: Lance Richardson <lance.richardson@broadcom.com>
Patch applied to dpdk-next-net-brcm.
Fixed the checkpatch error during merge.

> ---
>  drivers/net/bnxt/bnxt.h        | 13 +++++++++++++
>  drivers/net/bnxt/bnxt_ethdev.c |  7 ++++---
>  2 files changed, 17 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/bnxt/bnxt.h b/drivers/net/bnxt/bnxt.h
> index 05f8804274..263ea86590 100644
> --- a/drivers/net/bnxt/bnxt.h
> +++ b/drivers/net/bnxt/bnxt.h
> @@ -844,6 +844,7 @@ struct bnxt {
>  static
>  inline uint16_t bnxt_max_rings(struct bnxt *bp)
>  {
> +       struct rte_eth_conf *dev_conf = &bp->eth_dev->data->dev_conf;
>         uint16_t max_tx_rings = bp->max_tx_rings;
>         uint16_t max_rx_rings = bp->max_rx_rings;
>         uint16_t max_cp_rings = bp->max_cp_rings;
> @@ -861,6 +862,18 @@ inline uint16_t bnxt_max_rings(struct bnxt *bp)
>                                        bp->max_stat_ctx / 2U);
>         }
>
> +       if (BNXT_CHIP_P5(bp)) {
> +               /* RSS table size in Thor is 512.
> +                * Cap max Rx rings to the same value for RSS.
> +                * For non-RSS case cap it to the max VNIC count.
> +                */
> +               if(dev_conf->rxmode.mq_mode & ETH_MQ_RX_RSS_FLAG)
> +                       max_rx_rings = RTE_MIN(max_rx_rings,
> +                                              BNXT_RSS_TBL_SIZE_P5);
> +               else
> +                       max_rx_rings = RTE_MIN(max_rx_rings, bp->max_vnics);
> +       }
> +
>         max_tx_rings = RTE_MIN(max_tx_rings, max_rx_rings);
>         if (max_cp_rings > BNXT_NUM_ASYNC_CPR(bp))
>                 max_cp_rings -= BNXT_NUM_ASYNC_CPR(bp);
> diff --git a/drivers/net/bnxt/bnxt_ethdev.c b/drivers/net/bnxt/bnxt_ethdev.c
> index dc3b04110f..9da817f487 100644
> --- a/drivers/net/bnxt/bnxt_ethdev.c
> +++ b/drivers/net/bnxt/bnxt_ethdev.c
> @@ -422,12 +422,13 @@ static int bnxt_setup_one_vnic(struct bnxt *bp, uint16_t vnic_id)
>         if (dev_conf->rxmode.mq_mode & ETH_MQ_RX_RSS) {
>                 int j, nr_ctxs = bnxt_rss_ctxts(bp);
>
> +               /* RSS table size in Thor is 512.
> +                * Cap max Rx rings to same value
> +                */
>                 if (bp->rx_nr_rings > BNXT_RSS_TBL_SIZE_P5) {
>                         PMD_DRV_LOG(ERR, "RxQ cnt %d > reta_size %d\n",
>                                     bp->rx_nr_rings, BNXT_RSS_TBL_SIZE_P5);
> -                       PMD_DRV_LOG(ERR,
> -                                   "Only queues 0-%d will be in RSS table\n",
> -                                   BNXT_RSS_TBL_SIZE_P5 - 1);
> +                       goto err_out;
>                 }
>
>                 rc = 0;
> --
> 2.21.1 (Apple Git-122.3)
>