Merge branch 'mlxsw-line-card-status-tracking'

Ido Schimmel says:

====================
mlxsw: Line cards status tracking

When a line card is provisioned, netdevs corresponding to the ports
found on the line card are registered. User space can then perform
various logical configurations (e.g., splitting, setting MTU) on these
netdevs.

However, since the line card is not present / powered on (i.e., it is
not in 'active' state), user space cannot access the various components
found on the line card. For example, user space cannot read the
temperature of gearboxes or transceiver modules found on the line card
via hwmon / thermal. Similarly, it cannot dump the EEPROM contents of
these transceiver modules. The above is only possible when the line card
becomes active.

This patchset solves the problem by tracking the status of each line
card and invoking callbacks from interested parties when a line card
becomes active / inactive.

Patchset overview:

Patch #1 adds the infrastructure in the line cards core that allows
users to registers a set of callbacks that are invoked when a line card
becomes active / inactive. To avoid races, if a line card is already
active during registration, the got_active() callback is invoked.

Patches #2-#3 are preparations.

Patch #4 changes the port module core to register a set of callbacks
with the line cards core. See detailed description with examples in the
commit message.

Patches #5-#6 do the same with regards to thermal / hwmon support, so
that user space will be able to monitor the temperature of various
components on the line card when it becomes active.
====================

Signed-off-by: David S. Miller <[email protected]>

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

@@ -2175,7 +2175,7 @@ __mlxsw_core_bus_device_register(const struct mlxsw_bus_info *mlxsw_bus_info,
 	if (err)
 		goto err_thermal_init;
 
-	err = mlxsw_env_init(mlxsw_core, &mlxsw_core->env);
+	err = mlxsw_env_init(mlxsw_core, mlxsw_bus_info, &mlxsw_core->env);
 	if (err)
 		goto err_env_init;
 

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

@@ -590,6 +590,8 @@ struct mlxsw_linecards {
 	const struct mlxsw_bus_info *bus_info;
 	u8 count;
 	struct mlxsw_linecard_types_info *types_info;
+	struct list_head event_ops_list;
+	struct mutex event_ops_list_lock; /* Locks accesses to event ops list */
 	struct mlxsw_linecard linecards[];
 };
 
@@ -603,4 +605,19 @@ int mlxsw_linecards_init(struct mlxsw_core *mlxsw_core,
 			 const struct mlxsw_bus_info *bus_info);
 void mlxsw_linecards_fini(struct mlxsw_core *mlxsw_core);
 
+typedef void mlxsw_linecards_event_op_t(struct mlxsw_core *mlxsw_core,
+					u8 slot_index, void *priv);
+
+struct mlxsw_linecards_event_ops {
+	mlxsw_linecards_event_op_t *got_active;
+	mlxsw_linecards_event_op_t *got_inactive;
+};
+
+int mlxsw_linecards_event_ops_register(struct mlxsw_core *mlxsw_core,
+				       struct mlxsw_linecards_event_ops *ops,
+				       void *priv);
+void mlxsw_linecards_event_ops_unregister(struct mlxsw_core *mlxsw_core,
+					  struct mlxsw_linecards_event_ops *ops,
+					  void *priv);
+
 #endif