mlxsw: spectrum_buffers: Introduce shared buffer ops

The size of the internal buffer is currently calculated in the SPAN module.
Logically it belongs to the spectrum_buffers module, where it should be
moved. However, that being a chip-specific operation, it needs dynamic
dispatch. There currently is a chip-specific structure for description of
shared buffer values, struct mlxsw_sp_sb_vals. However placing ops into
this structure would be confusing. Therefore introduce a new per-chip
structure, currently empty, and initialize the ops pointer as appropriate.

Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlxsw/spectrum.c

@@ -2697,6 +2697,7 @@ static int mlxsw_sp1_init(struct mlxsw_core *mlxsw_core,
 	mlxsw_sp->mac_mask = mlxsw_sp1_mac_mask;
 	mlxsw_sp->rif_ops_arr = mlxsw_sp1_rif_ops_arr;
 	mlxsw_sp->sb_vals = &mlxsw_sp1_sb_vals;
+	mlxsw_sp->sb_ops = &mlxsw_sp1_sb_ops;
 	mlxsw_sp->port_type_speed_ops = &mlxsw_sp1_port_type_speed_ops;
 	mlxsw_sp->ptp_ops = &mlxsw_sp1_ptp_ops;
 	mlxsw_sp->span_ops = &mlxsw_sp1_span_ops;
@@ -2725,6 +2726,7 @@ static int mlxsw_sp2_init(struct mlxsw_core *mlxsw_core,
 	mlxsw_sp->mac_mask = mlxsw_sp2_mac_mask;
 	mlxsw_sp->rif_ops_arr = mlxsw_sp2_rif_ops_arr;
 	mlxsw_sp->sb_vals = &mlxsw_sp2_sb_vals;
+	mlxsw_sp->sb_ops = &mlxsw_sp2_sb_ops;
 	mlxsw_sp->port_type_speed_ops = &mlxsw_sp2_port_type_speed_ops;
 	mlxsw_sp->ptp_ops = &mlxsw_sp2_ptp_ops;
 	mlxsw_sp->span_ops = &mlxsw_sp2_span_ops;
@@ -2751,6 +2753,7 @@ static int mlxsw_sp3_init(struct mlxsw_core *mlxsw_core,
 	mlxsw_sp->mac_mask = mlxsw_sp2_mac_mask;
 	mlxsw_sp->rif_ops_arr = mlxsw_sp2_rif_ops_arr;
 	mlxsw_sp->sb_vals = &mlxsw_sp2_sb_vals;
+	mlxsw_sp->sb_ops = &mlxsw_sp3_sb_ops;
 	mlxsw_sp->port_type_speed_ops = &mlxsw_sp2_port_type_speed_ops;
 	mlxsw_sp->ptp_ops = &mlxsw_sp2_ptp_ops;
 	mlxsw_sp->span_ops = &mlxsw_sp3_span_ops;

drivers/net/ethernet/mellanox/mlxsw/spectrum.h

@@ -125,6 +125,7 @@ struct mlxsw_sp_mr_tcam_ops;
 struct mlxsw_sp_acl_rulei_ops;
 struct mlxsw_sp_acl_tcam_ops;
 struct mlxsw_sp_nve_ops;
+struct mlxsw_sp_sb_ops;
 struct mlxsw_sp_sb_vals;
 struct mlxsw_sp_port_type_speed_ops;
 struct mlxsw_sp_ptp_state;
@@ -171,6 +172,7 @@ struct mlxsw_sp {
 	const struct mlxsw_sp_nve_ops **nve_ops_arr;
 	const struct mlxsw_sp_rif_ops **rif_ops_arr;
 	const struct mlxsw_sp_sb_vals *sb_vals;
+	const struct mlxsw_sp_sb_ops *sb_ops;
 	const struct mlxsw_sp_port_type_speed_ops *port_type_speed_ops;
 	const struct mlxsw_sp_ptp_ops *ptp_ops;
 	const struct mlxsw_sp_span_ops *span_ops;
@@ -514,6 +516,10 @@ int mlxsw_sp_hdroom_configure(struct mlxsw_sp_port *mlxsw_sp_port,
 extern const struct mlxsw_sp_sb_vals mlxsw_sp1_sb_vals;
 extern const struct mlxsw_sp_sb_vals mlxsw_sp2_sb_vals;
 
+extern const struct mlxsw_sp_sb_ops mlxsw_sp1_sb_ops;
+extern const struct mlxsw_sp_sb_ops mlxsw_sp2_sb_ops;
+extern const struct mlxsw_sp_sb_ops mlxsw_sp3_sb_ops;
+
 /* spectrum_switchdev.c */
 int mlxsw_sp_switchdev_init(struct mlxsw_sp *mlxsw_sp);
 void mlxsw_sp_switchdev_fini(struct mlxsw_sp *mlxsw_sp);

drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c

@@ -121,6 +121,9 @@ struct mlxsw_sp_sb_vals {
 	unsigned int cms_cpu_count;
 };
 
+struct mlxsw_sp_sb_ops {
+};
+
 u32 mlxsw_sp_cells_bytes(const struct mlxsw_sp *mlxsw_sp, u32 cells)
 {
 	return mlxsw_sp->sb->cell_size * cells;
@@ -1101,6 +1104,15 @@ const struct mlxsw_sp_sb_vals mlxsw_sp2_sb_vals = {
 	.cms_cpu_count = ARRAY_SIZE(mlxsw_sp_cpu_port_sb_cms),
 };
 
+const struct mlxsw_sp_sb_ops mlxsw_sp1_sb_ops = {
+};
+
+const struct mlxsw_sp_sb_ops mlxsw_sp2_sb_ops = {
+};
+
+const struct mlxsw_sp_sb_ops mlxsw_sp3_sb_ops = {
+};
+
 int mlxsw_sp_buffers_init(struct mlxsw_sp *mlxsw_sp)
 {
 	u32 max_headroom_size;