Re: [dpdk-dev] [PATCH] net/mlx5: set VLAN tag matcher bit properly

[Slava Ovsiienko <viacheslavo@mellanox.com>]

> -----Original Message-----
> From: Dekel Peled <dekelp@mellanox.com>
> Sent: Sunday, February 9, 2020 14:26
> To: Matan Azrad <matan@mellanox.com>; Slava Ovsiienko
> <viacheslavo@mellanox.com>; Raslan Darawsheh <rasland@mellanox.com>
> Cc: dev@dpdk.org
> Subject: [PATCH] net/mlx5: set VLAN tag matcher bit properly
> 
> Currently MLX5 PMD can't match on untagged packets specifically.
> Tagged traffic still hits the flows intended for untagged packets.
> If the flow has ETH, it will catch all matching packets, tagged and untagged.
> The solution is to use cvlan_tag bit.
> If mask=1 and value=0 it matches on untagged traffic.
> If mask=1 and value=1 it matches on tagged traffic.
> This is the kernel implementation.
> 
> This patch updated MLX5 PMD to set cvlan_tag mask and value according to
> flow rule contents.
> 
> Signed-off-by: Dekel Peled <dekelp@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>

> ---
>  drivers/net/mlx5/mlx5_flow_dv.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/net/mlx5/mlx5_flow_dv.c
> b/drivers/net/mlx5/mlx5_flow_dv.c index 3daabd3..a28af7c 100644
> --- a/drivers/net/mlx5/mlx5_flow_dv.c
> +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> @@ -5214,6 +5214,15 @@ struct field_modify_info modify_tcp[] = {
>  		 rte_be_to_cpu_16(eth_m->type));
>  	l24_v = MLX5_ADDR_OF(fte_match_set_lyr_2_4, headers_v,
> ethertype);
>  	*(uint16_t *)(l24_v) = eth_m->type & eth_v->type;
> +	if (eth_v->type) {
> +		/* When ethertype is present set mask for tagged VLAN. */
> +		MLX5_SET(fte_match_set_lyr_2_4, headers_m, cvlan_tag, 1);
> +		/* Set value for tagged VLAN if ethertype is 802.1Q. */
> +		if (eth_v->type == RTE_BE16(RTE_ETHER_TYPE_VLAN) ||
> +		    eth_v->type == RTE_BE16(RTE_ETHER_TYPE_QINQ))
> +			MLX5_SET(fte_match_set_lyr_2_4, headers_v,
> cvlan_tag,
> +				 1);
> +	}
>  }
> 
>  /**
> @@ -5354,6 +5363,7 @@ struct field_modify_info modify_tcp[] = {
>  		 ipv4_m->hdr.next_proto_id);
>  	MLX5_SET(fte_match_set_lyr_2_4, headers_v, ip_protocol,
>  		 ipv4_v->hdr.next_proto_id & ipv4_m->hdr.next_proto_id);
> +	MLX5_SET(fte_match_set_lyr_2_4, headers_m, cvlan_tag, 1);
>  }
> 
>  /**
> @@ -5458,6 +5468,7 @@ struct field_modify_info modify_tcp[] = {
>  		 ipv6_m->hdr.proto);
>  	MLX5_SET(fte_match_set_lyr_2_4, headers_v, ip_protocol,
>  		 ipv6_v->hdr.proto & ipv6_m->hdr.proto);
> +	MLX5_SET(fte_match_set_lyr_2_4, headers_m, cvlan_tag, 1);
>  }
> 
>  /**
> --
> 1.8.3.1