mlxsw: reg: Extend MGPIR register with new slot fields

Extend MGPIR (Management General Peripheral Information Register) with
new fields specifying the slot number and number of the slots available
on system. The purpose of these fields is:
- to support access to MPGIR register on modular system for getting the
  number of cages, equipped on the line card, inserted at specified
  slot. In case slot number is set zero, MGPIR will provide the
  information for the main board. For Top of the Rack (non-modular)
  system it will provide the same as before.
- to provide the number of slots supported by system. This data is
  relevant only in case slot number is set zero.
Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -1060,12 +1060,12 @@ int mlxsw_env_init(struct mlxsw_core *mlxsw_core, struct mlxsw_env **p_env)
 	u8 module_count;
 	int i, err;
 
-	mlxsw_reg_mgpir_pack(mgpir_pl);
+	mlxsw_reg_mgpir_pack(mgpir_pl, 0);
 	err = mlxsw_reg_query(mlxsw_core, MLXSW_REG(mgpir), mgpir_pl);
 	if (err)
 		return err;
 
-	mlxsw_reg_mgpir_unpack(mgpir_pl, NULL, NULL, NULL, &module_count);
+	mlxsw_reg_mgpir_unpack(mgpir_pl, NULL, NULL, NULL, &module_count, NULL);
 
 	env = kzalloc(struct_size(env, module_info, module_count), GFP_KERNEL);
 	if (!env)

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

@@ -656,13 +656,13 @@ static int mlxsw_hwmon_module_init(struct mlxsw_hwmon *mlxsw_hwmon)
 	u8 module_sensor_max;
 	int i, err;
 
-	mlxsw_reg_mgpir_pack(mgpir_pl);
+	mlxsw_reg_mgpir_pack(mgpir_pl, 0);
 	err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mgpir), mgpir_pl);
 	if (err)
 		return err;
 
 	mlxsw_reg_mgpir_unpack(mgpir_pl, NULL, NULL, NULL,
-			       &module_sensor_max);
+			       &module_sensor_max, NULL);
 
 	/* Add extra attributes for module temperature. Sensor index is
 	 * assigned to sensor_count value, while all indexed before
@@ -707,12 +707,13 @@ static int mlxsw_hwmon_gearbox_init(struct mlxsw_hwmon *mlxsw_hwmon)
 	u8 gbox_num;
 	int err;
 
-	mlxsw_reg_mgpir_pack(mgpir_pl);
+	mlxsw_reg_mgpir_pack(mgpir_pl, 0);
 	err = mlxsw_reg_query(mlxsw_hwmon->core, MLXSW_REG(mgpir), mgpir_pl);
 	if (err)
 		return err;
 
-	mlxsw_reg_mgpir_unpack(mgpir_pl, &gbox_num, &device_type, NULL, NULL);
+	mlxsw_reg_mgpir_unpack(mgpir_pl, &gbox_num, &device_type, NULL, NULL,
+			       NULL);
 	if (device_type != MLXSW_REG_MGPIR_DEVICE_TYPE_GEARBOX_DIE ||
 	    !gbox_num)
 		return 0;

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

@@ -746,13 +746,13 @@ mlxsw_thermal_modules_init(struct device *dev, struct mlxsw_core *core,
 	char mgpir_pl[MLXSW_REG_MGPIR_LEN];
 	int i, err;
 
-	mlxsw_reg_mgpir_pack(mgpir_pl);
+	mlxsw_reg_mgpir_pack(mgpir_pl, 0);
 	err = mlxsw_reg_query(core, MLXSW_REG(mgpir), mgpir_pl);
 	if (err)
 		return err;
 
 	mlxsw_reg_mgpir_unpack(mgpir_pl, NULL, NULL, NULL,
-			       &thermal->tz_module_num);
+			       &thermal->tz_module_num, NULL);
 
 	thermal->tz_module_arr = kcalloc(thermal->tz_module_num,
 					 sizeof(*thermal->tz_module_arr),
@@ -837,13 +837,13 @@ mlxsw_thermal_gearboxes_init(struct device *dev, struct mlxsw_core *core,
 	int i;
 	int err;
 
-	mlxsw_reg_mgpir_pack(mgpir_pl);
+	mlxsw_reg_mgpir_pack(mgpir_pl, 0);
 	err = mlxsw_reg_query(core, MLXSW_REG(mgpir), mgpir_pl);
 	if (err)
 		return err;
 
 	mlxsw_reg_mgpir_unpack(mgpir_pl, &gbox_num, &device_type, NULL,
-			       NULL);
+			       NULL, NULL);
 	if (device_type != MLXSW_REG_MGPIR_DEVICE_TYPE_GEARBOX_DIE ||
 	    !gbox_num)
 		return 0;

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

@@ -11362,6 +11362,12 @@ enum mlxsw_reg_mgpir_device_type {
 	MLXSW_REG_MGPIR_DEVICE_TYPE_GEARBOX_DIE,
 };
 
+/* mgpir_slot_index
+ * Slot index (0: Main board).
+ * Access: Index
+ */
+MLXSW_ITEM32(reg, mgpir, slot_index, 0x00, 28, 4);
+
 /* mgpir_device_type
  * Access: RO
  */
@@ -11379,21 +11385,29 @@ MLXSW_ITEM32(reg, mgpir, devices_per_flash, 0x00, 16, 8);
  */
 MLXSW_ITEM32(reg, mgpir, num_of_devices, 0x00, 0, 8);
 
+/* mgpir_num_of_slots
+ * Number of slots in the system.
+ * Access: RO
+ */
+MLXSW_ITEM32(reg, mgpir, num_of_slots, 0x04, 8, 8);
+
 /* mgpir_num_of_modules
  * Number of modules.
  * Access: RO
  */
 MLXSW_ITEM32(reg, mgpir, num_of_modules, 0x04, 0, 8);
 
-static inline void mlxsw_reg_mgpir_pack(char *payload)
+static inline void mlxsw_reg_mgpir_pack(char *payload, u8 slot_index)
 {
 	MLXSW_REG_ZERO(mgpir, payload);
+	mlxsw_reg_mgpir_slot_index_set(payload, slot_index);
 }
 
 static inline void
 mlxsw_reg_mgpir_unpack(char *payload, u8 *num_of_devices,
 		       enum mlxsw_reg_mgpir_device_type *device_type,
-		       u8 *devices_per_flash, u8 *num_of_modules)
+		       u8 *devices_per_flash, u8 *num_of_modules,
+		       u8 *num_of_slots)
 {
 	if (num_of_devices)
 		*num_of_devices = mlxsw_reg_mgpir_num_of_devices_get(payload);
@@ -11404,6 +11418,8 @@ mlxsw_reg_mgpir_unpack(char *payload, u8 *num_of_devices,
 				mlxsw_reg_mgpir_devices_per_flash_get(payload);
 	if (num_of_modules)
 		*num_of_modules = mlxsw_reg_mgpir_num_of_modules_get(payload);
+	if (num_of_slots)
+		*num_of_slots = mlxsw_reg_mgpir_num_of_slots_get(payload);
 }
 
 /* MFDE - Monitoring FW Debug Register