Re: [dpdk-stable] [dpdk-dev] [PATCH] net/mlx5: fix tunnel flow priority

[Raslan Darawsheh <rasland@mellanox.com>]

Hi,


> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Matan Azrad
> Sent: Thursday, February 13, 2020 3:03 PM
> To: dev@dpdk.org
> Cc: Slava Ovsiienko <viacheslavo@mellanox.com>; stable@dpdk.org
> Subject: [dpdk-dev] [PATCH] net/mlx5: fix tunnel flow priority
> 
> The PMD manages internally the priority of the flows in addition to the
> user configured priority.
> 
> So, 2 flows with the same user priority may get different priority.
> 
> The method:
> As much as the flow is more specific it gets higher priority
> (higher means first to be matched).
> 
> In addition, When the user creates a RSS flow the PMD splits the flows
> according to the flow RSS layers as the HW requests for RSS TIR.
> The internal priority for each flow is decided by the flow last layer.
> L2, L3 and L4 (L2 low and L4 high).
> 
> The tunnel layer was wrongly decided to be L4 all the time, even when
> the flow is configured with inner-RSS.
> 
> Hence, the first RSS split which takes the tunnel layer priority all the
> time will be matched before the more specific splits.
> 
> Change the priority of tunnel layer to be L2 when inner-RSS is
> configured.
> 
> Fixes: d4a405186b73 ("net/mlx5: support tunnel RSS level")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Matan Azrad <matan@mellanox.com>
> Acked-by: Ori Kam <orika@mellanox.com>
> ---
>  drivers/net/mlx5/mlx5_flow_dv.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/net/mlx5/mlx5_flow_dv.c
> b/drivers/net/mlx5/mlx5_flow_dv.c
> index a9bb0b4..a8c8a58 100644
> --- a/drivers/net/mlx5/mlx5_flow_dv.c
> +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> @@ -7620,6 +7620,8 @@ struct field_modify_info modify_tcp[] = {
>  		case RTE_FLOW_ITEM_TYPE_GRE:
>  			flow_dv_translate_item_gre(match_mask,
> match_value,
>  						   items, tunnel);
> +			matcher.priority = flow->rss.level >= 2 ?
> +				    MLX5_PRIORITY_MAP_L2 :
> MLX5_PRIORITY_MAP_L4;
>  			last_item = MLX5_FLOW_LAYER_GRE;
>  			break;
>  		case RTE_FLOW_ITEM_TYPE_GRE_KEY:
> @@ -7630,27 +7632,37 @@ struct field_modify_info modify_tcp[] = {
>  		case RTE_FLOW_ITEM_TYPE_NVGRE:
>  			flow_dv_translate_item_nvgre(match_mask,
> match_value,
>  						     items, tunnel);
> +			matcher.priority = flow->rss.level >= 2 ?
> +				    MLX5_PRIORITY_MAP_L2 :
> MLX5_PRIORITY_MAP_L4;
>  			last_item = MLX5_FLOW_LAYER_GRE;
>  			break;
>  		case RTE_FLOW_ITEM_TYPE_VXLAN:
>  			flow_dv_translate_item_vxlan(match_mask,
> match_value,
>  						     items, tunnel);
> +			matcher.priority = flow->rss.level >= 2 ?
> +				    MLX5_PRIORITY_MAP_L2 :
> MLX5_PRIORITY_MAP_L4;
>  			last_item = MLX5_FLOW_LAYER_VXLAN;
>  			break;
>  		case RTE_FLOW_ITEM_TYPE_VXLAN_GPE:
>  			flow_dv_translate_item_vxlan_gpe(match_mask,
>  							 match_value, items,
>  							 tunnel);
> +			matcher.priority = flow->rss.level >= 2 ?
> +				    MLX5_PRIORITY_MAP_L2 :
> MLX5_PRIORITY_MAP_L4;
>  			last_item = MLX5_FLOW_LAYER_VXLAN_GPE;
>  			break;
>  		case RTE_FLOW_ITEM_TYPE_GENEVE:
>  			flow_dv_translate_item_geneve(match_mask,
> match_value,
>  						      items, tunnel);
> +			matcher.priority = flow->rss.level >= 2 ?
> +				    MLX5_PRIORITY_MAP_L2 :
> MLX5_PRIORITY_MAP_L4;
>  			last_item = MLX5_FLOW_LAYER_GENEVE;
>  			break;
>  		case RTE_FLOW_ITEM_TYPE_MPLS:
>  			flow_dv_translate_item_mpls(match_mask,
> match_value,
>  						    items, last_item, tunnel);
> +			matcher.priority = flow->rss.level >= 2 ?
> +				    MLX5_PRIORITY_MAP_L2 :
> MLX5_PRIORITY_MAP_L4;
>  			last_item = MLX5_FLOW_LAYER_MPLS;
>  			break;
>  		case RTE_FLOW_ITEM_TYPE_MARK:
> @@ -7692,6 +7704,8 @@ struct field_modify_info modify_tcp[] = {
>  		case RTE_FLOW_ITEM_TYPE_GTP:
>  			flow_dv_translate_item_gtp(match_mask,
> match_value,
>  						   items, tunnel);
> +			matcher.priority = flow->rss.level >= 2 ?
> +				    MLX5_PRIORITY_MAP_L2 :
> MLX5_PRIORITY_MAP_L4;
>  			last_item = MLX5_FLOW_LAYER_GTP;
>  			break;
>  		default:
> --
> 1.8.3.1


Patch applied to next-net-mlx,

Kindest regards,
Raslan Darawsheh