[dpdk-dev] [PATCH] net/bnxt: disable receive end-of-packet padding

Ajit Khaparde ajit.khaparde at broadcom.com
Tue Dec 8 21:59:15 CET 2020


On Thu, Dec 3, 2020 at 6:16 AM Lance Richardson
<lance.richardson at broadcom.com> wrote:
>
> Testing has shown that the packet forwarding rate for packet sizes
> that are not a multiple of the cache line size is reduced when the
> DMA size is padded to a multiple of the cache line size. Improve
> performance for these packet sizes by disabling EOP padding.
>
> Fixes: f4253e97e7b0 ("net/bnxt: set padding flags in Rx descriptor")
> Signed-off-by: Lance Richardson <lance.richardson at broadcom.com>
> Reviewed-by: Ajit Kumar Khaparde <ajit.khaparde at broadcom.com>
> Reviewed-by: Somnath Kotur <somnath.kotur at broadcom.com>
Patch applied to dpdk-next-net-brcm. Thanks

> ---
>  drivers/net/bnxt/bnxt_rxr.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/bnxt/bnxt_rxr.c b/drivers/net/bnxt/bnxt_rxr.c
> index fdbe6f71e..af1774844 100644
> --- a/drivers/net/bnxt/bnxt_rxr.c
> +++ b/drivers/net/bnxt/bnxt_rxr.c
> @@ -1113,7 +1113,7 @@ int bnxt_init_one_rx_ring(struct bnxt_rx_queue *rxq)
>         size = rte_pktmbuf_data_room_size(rxq->mb_pool) - RTE_PKTMBUF_HEADROOM;
>         size = RTE_MIN(BNXT_MAX_PKT_LEN, size);
>
> -       type = RX_PROD_PKT_BD_TYPE_RX_PROD_PKT | RX_PROD_PKT_BD_FLAGS_EOP_PAD;
> +       type = RX_PROD_PKT_BD_TYPE_RX_PROD_PKT;
>
>         rxr = rxq->rx_ring;
>         ring = rxr->rx_ring_struct;
> --
> 2.25.1
>

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