net/mlx5: fix flex item header length translation

[ upstream commit 7bda5be ]

Flex item API provides support for network header with a fixed and
variable lengths.
When PMD compiles a new flex item object configuration it converts
RTE parameters into matching PMD PARSE_GRAPH parameters and checks
the parameter values against port capabilities.

Current implementation mismatched PARSE_GRAPH configuration fields
for the fixed size header.

Fixes: b293e8e ("net/mlx5: translate flex item configuration")

Signed-off-by: Gregory Etelson <getelson@nvidia.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>

drivers/net/mlx5/mlx5_flow_flex.c

@@ -382,15 +382,11 @@ mlx5_flex_translate_length(struct mlx5_hca_flex_attr *attr,
 			return rte_flow_error_set
 				(error, EINVAL, RTE_FLOW_ERROR_TYPE_ITEM, NULL,
 				 "unsupported header length field mode (FIXED)");
-		if (attr->header_length_mask_width < field->field_size)
-			return rte_flow_error_set
-				(error, EINVAL, RTE_FLOW_ERROR_TYPE_ITEM, NULL,
-				 "header length field width exceeds limit");
-		if (field->offset_shift < 0 ||
-		    field->offset_shift > attr->header_length_mask_width)
+		if (field->field_size ||
+		    field->offset_mask || field->offset_shift)
 			return rte_flow_error_set
 				(error, EINVAL, RTE_FLOW_ERROR_TYPE_ITEM, NULL,
-				 "invalid header length field shift (FIXED");
+				 "invalid fields for fixed mode");
 		if (field->field_base < 0)
 			return rte_flow_error_set
 				(error, EINVAL, RTE_FLOW_ERROR_TYPE_ITEM, NULL,