net/mlx5: SF, Rely on hw table for SF devlink port allocation

Supporting SF allocation is currently checked at two places:
(a) SF devlink port allocator and
(b) SF HW table handler.

Both layers are using HCA CAP to identify it using helper routine
mlx5_sf_supported() and mlx5_sf_max_functions().

Instead, rely on the HW table handler to check if SF is supported
or not.
Signed-off-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Vu Pham <vuhuong@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/sf/devlink.c

@@ -437,9 +437,6 @@ static int mlx5_sf_vhca_event(struct notifier_block *nb, unsigned long opcode, v
 
 static void mlx5_sf_table_enable(struct mlx5_sf_table *table)
 {
-	if (!mlx5_sf_max_functions(table->dev))
-		return;
-
 	init_completion(&table->disable_complete);
 	refcount_set(&table->refcount, 1);
 }
@@ -462,9 +459,6 @@ static void mlx5_sf_deactivate_all(struct mlx5_sf_table *table)
 
 static void mlx5_sf_table_disable(struct mlx5_sf_table *table)
 {
-	if (!mlx5_sf_max_functions(table->dev))
-		return;
-
 	if (!refcount_read(&table->refcount))
 		return;
 
@@ -498,7 +492,8 @@ static int mlx5_sf_esw_event(struct notifier_block *nb, unsigned long event, voi
 
 static bool mlx5_sf_table_supported(const struct mlx5_core_dev *dev)
 {
-	return dev->priv.eswitch && MLX5_ESWITCH_MANAGER(dev) && mlx5_sf_supported(dev);
+	return dev->priv.eswitch && MLX5_ESWITCH_MANAGER(dev) &&
+	       mlx5_sf_hw_table_supported(dev);
 }
 
 int mlx5_sf_table_init(struct mlx5_core_dev *dev)

drivers/net/ethernet/mellanox/mlx5/core/sf/hw_table.c

@@ -41,7 +41,7 @@ int mlx5_sf_hw_table_sf_alloc(struct mlx5_core_dev *dev, u32 usr_sfnum)
 	int err;
 	int i;
 
-	if (!table->max_local_functions)
+	if (!table || !table->max_local_functions)
 		return -EOPNOTSUPP;
 
 	mutex_lock(&table->table_lock);
@@ -230,3 +230,8 @@ void mlx5_sf_hw_table_destroy(struct mlx5_core_dev *dev)
 	/* Dealloc SFs whose firmware event has been missed. */
 	mlx5_sf_hw_dealloc_all(table);
 }
+
+bool mlx5_sf_hw_table_supported(const struct mlx5_core_dev *dev)
+{
+	return !!dev->priv.sf_hw_table;
+}

drivers/net/ethernet/mellanox/mlx5/core/sf/priv.h

@@ -17,5 +17,6 @@ u16 mlx5_sf_sw_to_hw_id(const struct mlx5_core_dev *dev, u16 sw_id);
 int mlx5_sf_hw_table_sf_alloc(struct mlx5_core_dev *dev, u32 usr_sfnum);
 void mlx5_sf_hw_table_sf_free(struct mlx5_core_dev *dev, u16 id);
 void mlx5_sf_hw_table_sf_deferred_free(struct mlx5_core_dev *dev, u16 id);
+bool mlx5_sf_hw_table_supported(const struct mlx5_core_dev *dev);
 
 #endif