[dpdk-dev] [PATCH] net/mlx5: match on TCP flags via DV/DR engine

[Shahaf Shuler <shahafs@mellanox.com>]

From: Jack Min <jackmin@mellanox.com>

>Add support to match all TCP control bits (flags)
>except "NS (ECN-nonce)" via Direct Verbs (DV) or Direct Rule (DR)
>engine.
>
>Signed-off-by: Xiaoyu Min <jackmin@mellanox.com>
>Acked-by: Ori Kam <orika@mellanox.com>

Applied to next-net-mlx, with few points to address:
1. Your author name is not the same as your signed-of name. please take
care.
2. fixed some identation issues
3. modifed the title. please have a look.

thanks. 


>---
> drivers/net/mlx5/mlx5_flow_dv.c | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
>index cf255ca95c..44b4f40404 100644
>--- a/drivers/net/mlx5/mlx5_flow_dv.c
>+++ b/drivers/net/mlx5/mlx5_flow_dv.c
>@@ -2066,6 +2066,12 @@ flow_dv_validate(struct rte_eth_dev *dev, const struct rte_flow_attr *attr,
> 	uint64_t last_item = 0;
> 	uint8_t next_protocol = 0xff;
> 	int actions_n = 0;
>+	struct rte_flow_item_tcp nic_tcp_mask = {
>+		.hdr = { .tcp_flags = 0xFF,
>+			 .src_port = RTE_BE16(UINT16_MAX),
>+			 .dst_port = RTE_BE16(UINT16_MAX),
>+		}
>+	};
> 
> 	if (items == NULL)
> 		return -1;
>@@ -2146,7 +2152,7 @@ flow_dv_validate(struct rte_eth_dev *dev, const struct rte_flow_attr *attr,
> 			ret = mlx5_flow_validate_item_tcp
> 						(items, item_flags,
> 						 next_protocol,
>-						 &rte_flow_item_tcp_mask,
>+						 &nic_tcp_mask,
> 						 error);
> 			if (ret < 0)
> 				return ret;
>@@ -2862,6 +2868,10 @@ flow_dv_translate_item_tcp(void *matcher, void *key,
> 		 rte_be_to_cpu_16(tcp_m->hdr.dst_port));
> 	MLX5_SET(fte_match_set_lyr_2_4, headers_v, tcp_dport,
> 		 rte_be_to_cpu_16(tcp_v->hdr.dst_port & tcp_m->hdr.dst_port));
>+	MLX5_SET(fte_match_set_lyr_2_4, headers_m, tcp_flags,
>+		 tcp_m->hdr.tcp_flags);
>+	MLX5_SET(fte_match_set_lyr_2_4, headers_v, tcp_flags,
>+		 (tcp_v->hdr.tcp_flags & tcp_m->hdr.tcp_flags));
> }
> 
> /**