[dpdk-dev] [PATCH v2] examples/l3fwd: fix NEON instructions

Jianbo Liu Jianbo.Liu at arm.com
Mon Oct 30 08:36:15 CET 2017


The 10/30/2017 13:01, Guduri Prathyusha wrote:
> To group consecutive packets with same destination port in bursts of 4
> neon intrinsic data types dp1 and dp2 are calculated such that if
> dst_port[]={a,b,c,d,e,f,g,h,i...} dp1 should contain: <a,b,c,d> and
> dp2 should contain: <b,c,d,e> in the first iteration. dp1 should
> be <e,f,g,h> and dp2 should be <f,g,h,i> in the next iteration.
>
> Whereas the existing code incorrectly calculates dp1 as <d,e,f,g> from
> second iteration.
>
> This patch fixes the incorrect ARM NEON instructions on dp1.
>
> Fixes: 569b290cdb36 ("examples/l3fwd: add NEON implementation")
>
> Signed-off-by: Guduri Prathyusha <gprathyusha at caviumnetworks.com>

Acked-by: Jianbo Liu <jianbo.liu at arm.com>

> ---
>
> v2:
>
> * fix as suggested by Jianbo Liu
> ---
>  examples/l3fwd/l3fwd_neon.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/examples/l3fwd/l3fwd_neon.h b/examples/l3fwd/l3fwd_neon.h
> index 42d50d3c2..4bc161394 100644
> --- a/examples/l3fwd/l3fwd_neon.h
> +++ b/examples/l3fwd/l3fwd_neon.h
> @@ -192,7 +192,7 @@ send_packets_multi(struct lcore_conf *qconf, struct rte_mbuf **pkts_burst,
>                        * dp1:
>                        * <d[j], d[j+1], d[j+2], d[j+3], ... >
>                        */
> -                     dp1 = vextq_u16(dp1, dp1, FWDSTEP - 1);
> +                     dp1 = vextq_u16(dp2, dp1, FWDSTEP - 1);
>               }
>
>               /*
> --
> 2.14.1
>

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