[PATCH 22.11] net/mlx5/hws: fix IPv4 fragment matching

[Xueming(Steven) Li]

Thanks, patch applied

> -----Original Message-----
> From: Hamdan Igbaria <hamdani at nvidia.com>
> Sent: 4/10/2023 20:56
> To: Hamdan Igbaria <hamdani at nvidia.com>; Alex Vesker
> <valex at nvidia.com>; NBU-Contact-Thomas Monjalon (EXTERNAL)
> <thomas at monjalon.net>; Suanming Mou <suanmingm at nvidia.com>
> Cc: stable at dpdk.org; Ori Kam <orika at nvidia.com>
> Subject: [PATCH 22.11] net/mlx5/hws: fix IPv4 fragment matching
> 
> [ upstream commit f3291366c95096fbe99ab8dd2248d033b191522d ]
> 
> Fix IPv4 frag matching in case fragment_offset field is set to non zero value in
> the mask.
> fragment_offset value is converted using the following logic:
> -In case fragment_offset value was set to 0x3fff, then we will  match only on
> ip_fragmented bit.
> -Otherwise we will match fragment_offset based on spec and last  same as
> any other field.
> 
> Fixes: c55c2bf35333 ("net/mlx5/hws: add definer layer")
> 
> Signed-off-by: Hamdan Igbaria <hamdani at nvidia.com>
> ---
>  drivers/net/mlx5/hws/mlx5dr_definer.c | 11 +++++++++--
> drivers/net/mlx5/hws/mlx5dr_definer.h |  9 +++++++--
>  2 files changed, 16 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/mlx5/hws/mlx5dr_definer.c
> b/drivers/net/mlx5/hws/mlx5dr_definer.c
> index 6b98eb8c96..768bed580d 100644
> --- a/drivers/net/mlx5/hws/mlx5dr_definer.c
> +++ b/drivers/net/mlx5/hws/mlx5dr_definer.c
> @@ -123,6 +123,7 @@ struct mlx5dr_definer_conv_data {
>  	X(SET,		ipv4_next_proto,	v->next_proto_id,
> 	rte_ipv4_hdr) \
>  	X(SET,		ipv4_version,		STE_IPV4,
> 	rte_ipv4_hdr) \
>  	X(SET_BE16,	ipv4_frag,		v->fragment_offset,
> 	rte_ipv4_hdr) \
> +	X(SET,          ip_fragmented,          !!v->fragment_offset,   rte_ipv4_hdr) \
>  	X(SET_BE16,	ipv6_payload_len,	v->hdr.payload_len,
> 	rte_flow_item_ipv6) \
>  	X(SET,		ipv6_proto,		v->hdr.proto,
> 	rte_flow_item_ipv6) \
>  	X(SET,		ipv6_hop_limits,	v->hdr.hop_limits,
> 	rte_flow_item_ipv6) \
> @@ -542,8 +543,14 @@ mlx5dr_definer_conv_item_ipv4(struct
> mlx5dr_definer_conv_data *cd,
>  	if (m->fragment_offset) {
>  		fc = &cd->fc[DR_CALC_FNAME(IP_FRAG, inner)];
>  		fc->item_idx = item_idx;
> -		fc->tag_set = &mlx5dr_definer_ipv4_frag_set;
> -		DR_CALC_SET(fc, eth_l3, fragment_offset, inner);
> +		if (rte_be_to_cpu_16(m->fragment_offset) == 0x3fff) {
> +			fc->tag_set = &mlx5dr_definer_ip_fragmented_set;
> +			DR_CALC_SET(fc, eth_l2, ip_fragmented, inner);
> +		} else {
> +			fc->is_range = l && l->fragment_offset;
> +			fc->tag_set = &mlx5dr_definer_ipv4_frag_set;
> +			DR_CALC_SET(fc, eth_l3, ipv4_frag, inner);
> +		}
>  	}
> 
>  	if (m->next_proto_id) {
> diff --git a/drivers/net/mlx5/hws/mlx5dr_definer.h
> b/drivers/net/mlx5/hws/mlx5dr_definer.h
> index d52c6b0627..5b38a54e6b 100644
> --- a/drivers/net/mlx5/hws/mlx5dr_definer.h
> +++ b/drivers/net/mlx5/hws/mlx5dr_definer.h
> @@ -196,8 +196,13 @@ struct mlx5_ifc_definer_hl_eth_l3_bits {
>  	u8 time_to_live_hop_limit[0x8];
>  	u8 protocol_next_header[0x8];
>  	u8 identification[0x10];
> -	u8 flags[0x3];
> -	u8 fragment_offset[0xd];
> +	union {
> +		u8 ipv4_frag[0x10];
> +		struct {
> +			u8 flags[0x3];
> +			u8 fragment_offset[0xd];
> +		};
> +	};
>  	u8 ipv4_total_length[0x10];
>  	u8 checksum[0x10];
>  	u8 reserved_at_60[0xc];
> --
> 2.31.1