net/mlx5: fs, add match on ranges API

Range is a new flow destination type which allows matching on
a range of values instead of matching on a specific value.

Range flow destination has the following fields:
 - hit_ft: flow table to forward the traffic in case of hit
 - miss_ft: flow table to forward the traffic in case of miss
 - field: which packet characteristic to match on
 - min: minimal value for the selected field
 - max: maximal value for the selected field

Note:
 - In order to match, the value in the packet should meet
   the following criteria: min <= value < max
 - Currently, the only supported field type is L2 packet length
Signed-off-by: Yevgeny Kliteynik <kliteyn@nvidia.com>
Reviewed-by: Alex Vesker <valex@nvidia.com>
Reviewed-by: Mark Bloch <mbloch@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/diag/fs_tracepoint.c

@@ -228,6 +228,17 @@ const char *parse_fs_hdrs(struct trace_seq *p,
 	return ret;
 }
 
+static const char
+*fs_dest_range_field_to_str(enum mlx5_flow_dest_range_field field)
+{
+	switch (field) {
+	case MLX5_FLOW_DEST_RANGE_FIELD_PKT_LEN:
+		return "packet len";
+	default:
+		return "unknown dest range field";
+	}
+}
+
 const char *parse_fs_dst(struct trace_seq *p,
 			 const struct mlx5_flow_destination *dst,
 			 u32 counter_id)
@@ -259,6 +270,11 @@ const char *parse_fs_dst(struct trace_seq *p,
 	case MLX5_FLOW_DESTINATION_TYPE_PORT:
 		trace_seq_printf(p, "port\n");
 		break;
+	case MLX5_FLOW_DESTINATION_TYPE_RANGE:
+		trace_seq_printf(p, "field=%s min=%d max=%d\n",
+				 fs_dest_range_field_to_str(dst->range.field),
+				 dst->range.min, dst->range.max);
+		break;
 	case MLX5_FLOW_DESTINATION_TYPE_NONE:
 		trace_seq_printf(p, "none\n");
 		break;

drivers/net/ethernet/mellanox/mlx5/core/fs_core.c

@@ -448,7 +448,8 @@ static bool is_fwd_dest_type(enum mlx5_flow_destination_type type)
 		type == MLX5_FLOW_DESTINATION_TYPE_UPLINK ||
 		type == MLX5_FLOW_DESTINATION_TYPE_VPORT ||
 		type == MLX5_FLOW_DESTINATION_TYPE_FLOW_SAMPLER ||
-		type == MLX5_FLOW_DESTINATION_TYPE_TIR;
+		type == MLX5_FLOW_DESTINATION_TYPE_TIR ||
+		type == MLX5_FLOW_DESTINATION_TYPE_RANGE;
 }
 
 static bool check_valid_spec(const struct mlx5_flow_spec *spec)
@@ -1578,7 +1579,13 @@ static bool mlx5_flow_dests_cmp(struct mlx5_flow_destination *d1,
 		    (d1->type == MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE_NUM &&
 		     d1->ft_num == d2->ft_num) ||
 		    (d1->type == MLX5_FLOW_DESTINATION_TYPE_FLOW_SAMPLER &&
-		     d1->sampler_id == d2->sampler_id))
+		     d1->sampler_id == d2->sampler_id) ||
+		    (d1->type == MLX5_FLOW_DESTINATION_TYPE_RANGE &&
+		     d1->range.field == d2->range.field &&
+		     d1->range.hit_ft == d2->range.hit_ft &&
+		     d1->range.miss_ft == d2->range.miss_ft &&
+		     d1->range.min == d2->range.min &&
+		     d1->range.max == d2->range.max))
 			return true;
 	}
 

drivers/net/ethernet/mellanox/mlx5/core/fs_core.h

@@ -123,6 +123,7 @@ enum mlx5_flow_steering_mode {
 enum mlx5_flow_steering_capabilty {
 	MLX5_FLOW_STEERING_CAP_VLAN_PUSH_ON_RX = 1UL << 0,
 	MLX5_FLOW_STEERING_CAP_VLAN_POP_ON_TX = 1UL << 1,
+	MLX5_FLOW_STEERING_CAP_MATCH_RANGES = 1UL << 2,
 };
 
 struct mlx5_flow_steering {

include/linux/mlx5/fs.h

@@ -50,6 +50,7 @@ enum mlx5_flow_destination_type {
 	MLX5_FLOW_DESTINATION_TYPE_PORT,
 	MLX5_FLOW_DESTINATION_TYPE_COUNTER,
 	MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE_NUM,
+	MLX5_FLOW_DESTINATION_TYPE_RANGE,
 };
 
 enum {
@@ -143,6 +144,10 @@ enum {
 	MLX5_FLOW_DEST_VPORT_REFORMAT_ID  = BIT(1),
 };
 
+enum mlx5_flow_dest_range_field {
+	MLX5_FLOW_DEST_RANGE_FIELD_PKT_LEN = 0,
+};
+
 struct mlx5_flow_destination {
 	enum mlx5_flow_destination_type	type;
 	union {
@@ -156,6 +161,13 @@ struct mlx5_flow_destination {
 			struct mlx5_pkt_reformat *pkt_reformat;
 			u8		flags;
 		} vport;
+		struct {
+			struct mlx5_flow_table         *hit_ft;
+			struct mlx5_flow_table         *miss_ft;
+			enum mlx5_flow_dest_range_field field;
+			u32                             min;
+			u32                             max;
+		} range;
 		u32			sampler_id;
 	};
 };