[dpdk-dev] [PATCH] net/octeontx2: fix CQE ring prefetch on wrap around case

Jerin Jacob jerinjacobk at gmail.com
Fri Oct 4 14:24:43 CEST 2019


On Fri, Sep 13, 2019 at 9:01 PM <jerinj at marvell.com> wrote:
>
> From: Kommula Shiva Shankar <kshankar at marvell.com>
>
> When computing the head of CQE ring of prefetch, use qmask to point to
> the correct head index on wrap around case.
>
> Fixes: cc4d7693f2d9 ("net/octeontx2: support Rx")
> Cc: stable at dpdk.org
>
> Signed-off-by: Kommula Shiva Shankar <kshankar at marvell.com>
> Acked-by: Jerin Jacob <jerinj at marvell.com>

Applied to dpdk-next-net-mrvl/master. Thanks



> ---
>  drivers/net/octeontx2/otx2_rx.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/octeontx2/otx2_rx.c b/drivers/net/octeontx2/otx2_rx.c
> index 701efc858..48565db03 100644
> --- a/drivers/net/octeontx2/otx2_rx.c
> +++ b/drivers/net/octeontx2/otx2_rx.c
> @@ -61,7 +61,8 @@ nix_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
>
>         while (packets < nb_pkts) {
>                 /* Prefetch N desc ahead */
> -               rte_prefetch_non_temporal((void *)(desc + (CQE_SZ(head + 2))));
> +               rte_prefetch_non_temporal((void *)(desc +
> +                                       (CQE_SZ((head + 2) & qmask))));
>                 cq = (struct nix_cqe_hdr_s *)(desc + CQE_SZ(head));
>
>                 mbuf = nix_get_mbuf_from_cqe(cq, data_off);
> --
> 2.23.0
>


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