mlxsw: core, pci: Add plumbing related to LAG mode

lag_mode describes where the responsibility for LAG table placement lies:
SW or FW. The bus module determines whether LAG is supported, can configure
it if it is, and knows what (if any) configuration has been applied.
Therefore add a bus callback to determine the configured LAG mode. Also add
to core an API to query it.

The LAG mode is for now kept at the default value of 0 for FW-managed. The
code to actually toggle it will be added later.
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -204,6 +204,13 @@ int mlxsw_core_max_lag(struct mlxsw_core *mlxsw_core, u16 *p_max_lag)
 }
 EXPORT_SYMBOL(mlxsw_core_max_lag);
 
+enum mlxsw_cmd_mbox_config_profile_lag_mode
+mlxsw_core_lag_mode(struct mlxsw_core *mlxsw_core)
+{
+	return mlxsw_core->bus->lag_mode(mlxsw_core->bus_priv);
+}
+EXPORT_SYMBOL(mlxsw_core_lag_mode);
+
 void *mlxsw_core_driver_priv(struct mlxsw_core *mlxsw_core)
 {
 	return mlxsw_core->driver_priv;

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

@@ -36,6 +36,8 @@ struct mlxsw_fw_rev;
 unsigned int mlxsw_core_max_ports(const struct mlxsw_core *mlxsw_core);
 
 int mlxsw_core_max_lag(struct mlxsw_core *mlxsw_core, u16 *p_max_lag);
+enum mlxsw_cmd_mbox_config_profile_lag_mode
+mlxsw_core_lag_mode(struct mlxsw_core *mlxsw_core);
 
 void *mlxsw_core_driver_priv(struct mlxsw_core *mlxsw_core);
 
@@ -485,6 +487,7 @@ struct mlxsw_bus {
 	u32 (*read_frc_l)(void *bus_priv);
 	u32 (*read_utc_sec)(void *bus_priv);
 	u32 (*read_utc_nsec)(void *bus_priv);
+	enum mlxsw_cmd_mbox_config_profile_lag_mode (*lag_mode)(void *bus_priv);
 	u8 features;
 };
 

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

@@ -105,6 +105,8 @@ struct mlxsw_pci {
 	u64 free_running_clock_offset;
 	u64 utc_sec_offset;
 	u64 utc_nsec_offset;
+	bool lag_mode_support;
+	enum mlxsw_cmd_mbox_config_profile_lag_mode lag_mode;
 	struct mlxsw_pci_queue_type_group queues[MLXSW_PCI_QUEUE_TYPE_COUNT];
 	u32 doorbell_offset;
 	struct mlxsw_core *core;
@@ -1312,6 +1314,7 @@ static int mlxsw_pci_config_profile(struct mlxsw_pci *mlxsw_pci, char *mbox,
 					profile->cqe_time_stamp_type);
 	}
 
+	mlxsw_pci->lag_mode = MLXSW_CMD_MBOX_CONFIG_PROFILE_LAG_MODE_FW;
 	return mlxsw_cmd_config_profile_set(mlxsw_pci->core, mbox);
 }
 
@@ -1587,6 +1590,8 @@ static int mlxsw_pci_init(void *bus_priv, struct mlxsw_core *mlxsw_core,
 	mlxsw_pci->utc_nsec_offset =
 		mlxsw_cmd_mbox_query_fw_utc_nsec_offset_get(mbox);
 
+	mlxsw_pci->lag_mode_support =
+		mlxsw_cmd_mbox_query_fw_lag_mode_support_get(mbox);
 	num_pages = mlxsw_cmd_mbox_query_fw_fw_pages_get(mbox);
 	err = mlxsw_pci_fw_area_init(mlxsw_pci, mbox, num_pages);
 	if (err)
@@ -1896,6 +1901,14 @@ static u32 mlxsw_pci_read_utc_nsec(void *bus_priv)
 	return mlxsw_pci_read32_off(mlxsw_pci, mlxsw_pci->utc_nsec_offset);
 }
 
+static enum mlxsw_cmd_mbox_config_profile_lag_mode
+mlxsw_pci_lag_mode(void *bus_priv)
+{
+	struct mlxsw_pci *mlxsw_pci = bus_priv;
+
+	return mlxsw_pci->lag_mode;
+}
+
 static const struct mlxsw_bus mlxsw_pci_bus = {
 	.kind			= "pci",
 	.init			= mlxsw_pci_init,
@@ -1907,6 +1920,7 @@ static const struct mlxsw_bus mlxsw_pci_bus = {
 	.read_frc_l		= mlxsw_pci_read_frc_l,
 	.read_utc_sec		= mlxsw_pci_read_utc_sec,
 	.read_utc_nsec		= mlxsw_pci_read_utc_nsec,
+	.lag_mode		= mlxsw_pci_lag_mode,
 	.features		= MLXSW_BUS_F_TXRX | MLXSW_BUS_F_RESET,
 };