mlxsw: core_linecards: Add line card objects and implement provisioning

Introduce objects for line cards and an infrastructure around that.
Use devlink_linecard_create/destroy() to register the line card with
devlink core. Implement provisioning ops with a list of supported
line cards.

Signed-off-by: Jiri Pirko <jiri@nvidia.com>

drivers/net/ethernet/mellanox/mlxsw/Makefile

@@ -1,7 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0
 obj-$(CONFIG_MLXSW_CORE)	+= mlxsw_core.o
 mlxsw_core-objs			:= core.o core_acl_flex_keys.o \
-				   core_acl_flex_actions.o core_env.o
+				   core_acl_flex_actions.o core_env.o \
+				   core_linecards.o
 mlxsw_core-$(CONFIG_MLXSW_CORE_HWMON) += core_hwmon.o
 mlxsw_core-$(CONFIG_MLXSW_CORE_THERMAL) += core_thermal.o
 obj-$(CONFIG_MLXSW_PCI)		+= mlxsw_pci.o

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

@@ -82,6 +82,7 @@ struct mlxsw_core {
 	struct mlxsw_res res;
 	struct mlxsw_hwmon *hwmon;
 	struct mlxsw_thermal *thermal;
+	struct mlxsw_linecards *linecards;
 	struct mlxsw_core_port *ports;
 	unsigned int max_ports;
 	atomic_t active_ports_count;
@@ -94,6 +95,11 @@ struct mlxsw_core {
 	/* driver_priv has to be always the last item */
 };
 
+struct mlxsw_linecards *mlxsw_core_linecards(struct mlxsw_core *mlxsw_core)
+{
+	return mlxsw_core->linecards;
+}
+
 #define MLXSW_PORT_MAX_PORTS_DEFAULT	0x40
 
 static u64 mlxsw_ports_occ_get(void *priv)
@@ -1973,6 +1979,11 @@ __mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 	if (err)
 		goto err_emad_init;
 
+	err = mlxsw_linecards_init(mlxsw_core, mlxsw_bus_info,
+				   &mlxsw_core->linecards);
+	if (err)
+		goto err_linecards_init;
+
 	if (!reload) {
 		err = mlxsw_core_params_register(mlxsw_core);
 		if (err)
@@ -2007,12 +2018,19 @@ __mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 			goto err_driver_init;
 	}
 
+	err = mlxsw_linecards_post_init(mlxsw_core, mlxsw_core->linecards);
+	if (err)
+		goto err_linecards_post_init;
+
 	if (!reload) {
 		devlink_set_features(devlink, DEVLINK_F_RELOAD);
 		devlink_register(devlink);
 	}
 	return 0;
 
+err_linecards_post_init:
+	if (mlxsw_core->driver->fini)
+		mlxsw_core->driver->fini(mlxsw_core);
 err_driver_init:
 	mlxsw_env_fini(mlxsw_core->env);
 err_env_init:
@@ -2026,6 +2044,8 @@ __mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 	if (!reload)
 		mlxsw_core_params_unregister(mlxsw_core);
 err_register_params:
+	mlxsw_linecards_fini(mlxsw_core, mlxsw_core->linecards);
+err_linecards_init:
 	mlxsw_emad_fini(mlxsw_core);
 err_emad_init:
 	kfree(mlxsw_core->lag.mapping);
@@ -2087,6 +2107,7 @@ void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core,
 			return;
 	}
 
+	mlxsw_linecards_pre_fini(mlxsw_core, mlxsw_core->linecards);
 	if (mlxsw_core->driver->fini)
 		mlxsw_core->driver->fini(mlxsw_core);
 	mlxsw_env_fini(mlxsw_core->env);
@@ -2095,6 +2116,7 @@ void mlxsw_core_bus_device_unregister(struct mlxsw_core *mlxsw_core,
 	mlxsw_core_health_fini(mlxsw_core);
 	if (!reload)
 		mlxsw_core_params_unregister(mlxsw_core);
+	mlxsw_linecards_fini(mlxsw_core, mlxsw_core->linecards);
 	mlxsw_emad_fini(mlxsw_core);
 	kfree(mlxsw_core->lag.mapping);
 	mlxsw_ports_fini(mlxsw_core, reload);

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

@@ -35,6 +35,8 @@ unsigned int mlxsw_core_max_ports(const struct mlxsw_core *mlxsw_core);
 
 void *mlxsw_core_driver_priv(struct mlxsw_core *mlxsw_core);
 
+struct mlxsw_linecards *mlxsw_core_linecards(struct mlxsw_core *mlxsw_core);
+
 bool mlxsw_core_res_query_enabled(const struct mlxsw_core *mlxsw_core);
 
 bool mlxsw_core_temp_warn_enabled(const struct mlxsw_core *mlxsw_core);
@@ -542,4 +544,48 @@ static inline struct mlxsw_skb_cb *mlxsw_skb_cb(struct sk_buff *skb)
 	return (struct mlxsw_skb_cb *) skb->cb;
 }
 
+struct mlxsw_linecards;
+
+struct mlxsw_linecard {
+	u8 slot_index;
+	struct mlxsw_linecards *linecards;
+	struct devlink_linecard *devlink_linecard;
+	struct mutex lock; /* Locks accesses to the linecard structure */
+	char read_name[MLXSW_REG_MDDQ_SLOT_ACII_NAME_LEN];
+	char mbct_pl[MLXSW_REG_MBCT_LEN]; /* too big for stack */
+	bool provisioned;
+};
+
+struct mlxsw_linecard_types_info;
+
+struct mlxsw_linecards {
+	struct list_head event_ops_list;
+	struct workqueue_struct *wq;
+	struct mlxsw_core *mlxsw_core;
+	const struct mlxsw_bus_info *bus_info;
+	u8 count;
+	struct mlxsw_linecard_types_info *types_info;
+	struct mlxsw_linecard linecards[0];
+};
+
+static inline struct mlxsw_linecard *
+mlxsw_linecard_get(struct mlxsw_linecards *linecards, u8 slot_index)
+{
+	return &linecards->linecards[slot_index - 1];
+}
+
+int mlxsw_linecards_init(struct mlxsw_core *mlxsw_core,
+			 const struct mlxsw_bus_info *bus_info,
+			 struct mlxsw_linecards **p_linecards);
+int mlxsw_linecards_post_init(struct mlxsw_core *mlxsw_core,
+			      struct mlxsw_linecards *linecards);
+void mlxsw_linecards_pre_fini(struct mlxsw_core *mlxsw_core,
+			      struct mlxsw_linecards *linecards);
+void mlxsw_linecards_fini(struct mlxsw_core *mlxsw_core,
+			  struct mlxsw_linecards *linecards);
+int mlxsw_linecard_status_process(struct mlxsw_core *mlxsw_core,
+				  const char *mddq_pl);
+int mlxsw_linecard_bct_process(struct mlxsw_core *mlxsw_core,
+			       const char *mbct_pl);
+
 #endif