net/mlx5: Add new miss flow table action

Flow table supports three types of miss action:
1. Default miss action - go to default miss table according to table.
2. Go to specific table.
3. Switch domain - go to the root table of an alternative steering
   table domain.

New table miss action was added - switch_domain.
The next domain for RDMA_RX namespace is the NIC RX domain.
Signed-off-by: Maor Gottlieb <maorg@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

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

@@ -172,9 +172,14 @@ static int mlx5_cmd_create_flow_table(struct mlx5_flow_root_namespace *ns,
 	case FS_FT_OP_MOD_NORMAL:
 		if (next_ft) {
 			MLX5_SET(create_flow_table_in, in,
-				 flow_table_context.table_miss_action, 1);
+				 flow_table_context.table_miss_action,
+				 MLX5_FLOW_TABLE_MISS_ACTION_FWD);
 			MLX5_SET(create_flow_table_in, in,
 				 flow_table_context.table_miss_id, next_ft->id);
+		} else {
+			MLX5_SET(create_flow_table_in, in,
+				 flow_table_context.table_miss_action,
+				 ns->def_miss_action);
 		}
 		break;
 
@@ -246,13 +251,15 @@ static int mlx5_cmd_modify_flow_table(struct mlx5_flow_root_namespace *ns,
 			 MLX5_MODIFY_FLOW_TABLE_MISS_TABLE_ID);
 		if (next_ft) {
 			MLX5_SET(modify_flow_table_in, in,
-				 flow_table_context.table_miss_action, 1);
+				 flow_table_context.table_miss_action,
+				 MLX5_FLOW_TABLE_MISS_ACTION_FWD);
 			MLX5_SET(modify_flow_table_in, in,
 				 flow_table_context.table_miss_id,
 				 next_ft->id);
 		} else {
 			MLX5_SET(modify_flow_table_in, in,
-				 flow_table_context.table_miss_action, 0);
+				 flow_table_context.table_miss_action,
+				 ns->def_miss_action);
 		}
 	}
 

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

@@ -2504,6 +2504,9 @@ static int init_rdma_rx_root_ns(struct mlx5_flow_steering *steering)
 	if (!steering->rdma_rx_root_ns)
 		return -ENOMEM;
 
+	steering->rdma_rx_root_ns->def_miss_action =
+		MLX5_FLOW_TABLE_MISS_ACTION_SWITCH_DOMAIN;
+
 	/* Create single prio */
 	prio = fs_create_prio(&steering->rdma_rx_root_ns->ns, 0, 1);
 	if (IS_ERR(prio)) {
@@ -2748,7 +2751,8 @@ int mlx5_init_fs(struct mlx5_core_dev *dev)
 			goto err;
 	}
 
-	if (MLX5_CAP_FLOWTABLE_RDMA_RX(dev, ft_support)) {
+	if (MLX5_CAP_FLOWTABLE_RDMA_RX(dev, ft_support) &&
+	    MLX5_CAP_FLOWTABLE_RDMA_RX(dev, table_miss_action_domain)) {
 		err = init_rdma_rx_root_ns(steering);
 		if (err)
 			goto err;

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

@@ -218,6 +218,7 @@ struct mlx5_flow_root_namespace {
 	struct mutex			chain_lock;
 	struct list_head		underlay_qpns;
 	const struct mlx5_flow_cmds	*cmds;
+	enum mlx5_flow_table_miss_action def_miss_action;
 };
 
 int mlx5_init_fc_stats(struct mlx5_core_dev *dev);

include/linux/mlx5/mlx5_ifc.h

@@ -370,7 +370,9 @@ struct mlx5_ifc_flow_table_prop_layout_bits {
 	u8	   reformat_l3_tunnel_to_l2[0x1];
 	u8	   reformat_l2_to_l3_tunnel[0x1];
 	u8	   reformat_and_modify_action[0x1];
-	u8         reserved_at_15[0xb];
+	u8         reserved_at_15[0x2];
+	u8	   table_miss_action_domain[0x1];
+	u8         reserved_at_18[0x8];
 	u8         reserved_at_20[0x2];
 	u8         log_max_ft_size[0x6];
 	u8         log_max_modify_header_context[0x8];
@@ -1284,6 +1286,12 @@ enum mlx5_flow_destination_type {
 	MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE_NUM = 0x101,
 };
 
+enum mlx5_flow_table_miss_action {
+	MLX5_FLOW_TABLE_MISS_ACTION_DEF,
+	MLX5_FLOW_TABLE_MISS_ACTION_FWD,
+	MLX5_FLOW_TABLE_MISS_ACTION_SWITCH_DOMAIN,
+};
+
 struct mlx5_ifc_dest_format_struct_bits {
 	u8         destination_type[0x8];
 	u8         destination_id[0x18];