Re: [dpdk-stable] [PATCH] net/mlx5: fix updating total length of multi-packet send

["Nélio Laranjeiro" <nelio.laranjeiro@6wind.com>]

On Thu, Feb 02, 2017 at 10:43:32AM -0800, Yongseok Koh wrote:
> The total length field in descriptor of inlined multi-packet send must be
> updated before closing a seesion. There's possibility of updating it
> afterward. This bug might cause one packet out of MLX5_MPW_DSEG_MAX gets
> silently dropped by HW and impact performance, escpecially lossless test.
> 
> Fixes: 230189d9ff22 ("net/mlx5: support multi-packet send")
> CC: stable@dpdk.org
> 
> Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
> ---
>  drivers/net/mlx5/mlx5_rxtx.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
> index 94fe74763..1043ebbc0 100644
> --- a/drivers/net/mlx5/mlx5_rxtx.c
> +++ b/drivers/net/mlx5/mlx5_rxtx.c
> @@ -1046,6 +1046,7 @@ mlx5_tx_burst_mpw_inline(void *dpdk_txq, struct rte_mbuf **pkts,
>  					mpw.data.raw += length;
>  			}
>  			++mpw.pkts_n;
> +			mpw.total_len += length;
>  			++j;
>  			if (mpw.pkts_n == MLX5_MPW_DSEG_MAX) {
>  				mlx5_mpw_inline_close(txq, &mpw);
> @@ -1055,7 +1056,6 @@ mlx5_tx_burst_mpw_inline(void *dpdk_txq, struct rte_mbuf **pkts,
>  				inline_room -= length;
>  			}
>  		}
> -		mpw.total_len += length;
>  		elts_head = elts_head_next;
>  #ifdef MLX5_PMD_SOFT_COUNTERS
>  		/* Increment sent bytes counter. */
> -- 
> 2.11.0


Acked-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>

-- 
Nélio Laranjeiro
6WIND