net/mlx5: Move table size calculation to steering cmd layer

Currently the table size is calculated by the fs_core layer. However, each
steering cmd instance has a different allocation logic. FW steering uses
a predefined pools of multiple sizes. SW steering doesn't have a pool,
and can allocate any size of tables.

Move the table size calculation to the steering cmd layer as a pre-step
for moving fs_chains pool logic globally to firmware steering, and
increasing table sizes for software steering. In addition, change the
size parameter to absolute size to allow the special zero value to
mean "get next available maximum size".
Signed-off-by: Paul Blakey <paulb@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

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

@@ -49,9 +49,11 @@ static int mlx5_cmd_stub_update_root_ft(struct mlx5_flow_root_namespace *ns,
 
 static int mlx5_cmd_stub_create_flow_table(struct mlx5_flow_root_namespace *ns,
 					   struct mlx5_flow_table *ft,
-					   unsigned int log_size,
+					   unsigned int size,
 					   struct mlx5_flow_table *next_ft)
 {
+	ft->max_fte = size ? roundup_pow_of_two(size) : 1;
+
 	return 0;
 }
 
@@ -181,7 +183,7 @@ static int mlx5_cmd_update_root_ft(struct mlx5_flow_root_namespace *ns,
 
 static int mlx5_cmd_create_flow_table(struct mlx5_flow_root_namespace *ns,
 				      struct mlx5_flow_table *ft,
-				      unsigned int log_size,
+				      unsigned int size,
 				      struct mlx5_flow_table *next_ft)
 {
 	int en_encap = !!(ft->flags & MLX5_FLOW_TABLE_TUNNEL_EN_REFORMAT);
@@ -190,8 +192,12 @@ static int mlx5_cmd_create_flow_table(struct mlx5_flow_root_namespace *ns,
 	u32 out[MLX5_ST_SZ_DW(create_flow_table_out)] = {};
 	u32 in[MLX5_ST_SZ_DW(create_flow_table_in)] = {};
 	struct mlx5_core_dev *dev = ns->dev;
+	unsigned int log_size = 0;
 	int err;
 
+	log_size = size ? ilog2(roundup_pow_of_two(size)) : 0;
+	ft->max_fte = 1 << log_size;
+
 	MLX5_SET(create_flow_table_in, in, opcode,
 		 MLX5_CMD_OP_CREATE_FLOW_TABLE);
 

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

@@ -38,7 +38,7 @@
 struct mlx5_flow_cmds {
 	int (*create_flow_table)(struct mlx5_flow_root_namespace *ns,
 				 struct mlx5_flow_table *ft,
-				 unsigned int log_size,
+				 unsigned int size,
 				 struct mlx5_flow_table *next_ft);
 	int (*destroy_flow_table)(struct mlx5_flow_root_namespace *ns,
 				  struct mlx5_flow_table *ft);

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

@@ -752,7 +752,7 @@ static struct mlx5_flow_group *alloc_insert_flow_group(struct mlx5_flow_table *f
 	return fg;
 }
 
-static struct mlx5_flow_table *alloc_flow_table(int level, u16 vport, int max_fte,
+static struct mlx5_flow_table *alloc_flow_table(int level, u16 vport,
 						enum fs_flow_table_type table_type,
 						enum fs_flow_table_op_mod op_mod,
 						u32 flags)
@@ -775,7 +775,6 @@ static struct mlx5_flow_table *alloc_flow_table(int level, u16 vport, int max_ft
 	ft->op_mod = op_mod;
 	ft->type = table_type;
 	ft->vport = vport;
-	ft->max_fte = max_fte;
 	ft->flags = flags;
 	INIT_LIST_HEAD(&ft->fwd_rules);
 	mutex_init(&ft->lock);
@@ -1070,7 +1069,6 @@ static struct mlx5_flow_table *__mlx5_create_flow_table(struct mlx5_flow_namespa
 	struct mlx5_flow_table *next_ft;
 	struct fs_prio *fs_prio = NULL;
 	struct mlx5_flow_table *ft;
-	int log_table_sz;
 	int err;
 
 	if (!root) {
@@ -1101,7 +1099,6 @@ static struct mlx5_flow_table *__mlx5_create_flow_table(struct mlx5_flow_namespa
 	 */
 	ft = alloc_flow_table(ft_attr->level,
 			      vport,
-			      ft_attr->max_fte ? roundup_pow_of_two(ft_attr->max_fte) : 0,
 			      root->table_type,
 			      op_mod, ft_attr->flags);
 	if (IS_ERR(ft)) {
@@ -1110,12 +1107,11 @@ static struct mlx5_flow_table *__mlx5_create_flow_table(struct mlx5_flow_namespa
 	}
 
 	tree_init_node(&ft->node, del_hw_flow_table, del_sw_flow_table);
-	log_table_sz = ft->max_fte ? ilog2(ft->max_fte) : 0;
 	next_ft = unmanaged ? ft_attr->next_ft :
 			      find_next_chained_ft(fs_prio);
 	ft->def_miss_action = ns->def_miss_action;
 	ft->ns = ns;
-	err = root->cmds->create_flow_table(root, ft, log_table_sz, next_ft);
+	err = root->cmds->create_flow_table(root, ft, ft_attr->max_fte, next_ft);
 	if (err)
 		goto free_ft;
 

drivers/net/ethernet/mellanox/mlx5/core/steering/fs_dr.c

@@ -62,7 +62,7 @@ static int set_miss_action(struct mlx5_flow_root_namespace *ns,
 
 static int mlx5_cmd_dr_create_flow_table(struct mlx5_flow_root_namespace *ns,
 					 struct mlx5_flow_table *ft,
-					 unsigned int log_size,
+					 unsigned int size,
 					 struct mlx5_flow_table *next_ft)
 {
 	struct mlx5dr_table *tbl;
@@ -71,7 +71,7 @@ static int mlx5_cmd_dr_create_flow_table(struct mlx5_flow_root_namespace *ns,
 
 	if (mlx5_dr_is_fw_table(ft->flags))
 		return mlx5_fs_cmd_get_fw_cmds()->create_flow_table(ns, ft,
-								    log_size,
+								    size,
 								    next_ft);
 	flags = ft->flags;
 	/* turn off encap/decap if not supported for sw-str by fw */
@@ -97,6 +97,8 @@ static int mlx5_cmd_dr_create_flow_table(struct mlx5_flow_root_namespace *ns,
 		}
 	}
 
+	ft->max_fte = size ? roundup_pow_of_two(size) : 1;
+
 	return 0;
 }