mlxsw: pci: Obtain info about ports used by eXtended mezanine

The output of boardinfo command was extended to contain information
about XM. Indicates if is present and in case it is, tells which
localports are used for the connection. So parse this info and store it
in bus_info passed up to the driver.
Signed-off-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -343,6 +343,23 @@ static inline int mlxsw_cmd_boardinfo(struct mlxsw_core *mlxsw_core,
 				  0, 0, false, out_mbox, MLXSW_CMD_MBOX_SIZE);
 }
 
+/* cmd_mbox_xm_num_local_ports
+ * Number of local_ports connected to the xm.
+ * Each local port is a 4x
+ * Spectrum-2/3: 25G
+ * Spectrum-4: 50G
+ */
+MLXSW_ITEM32(cmd_mbox, boardinfo, xm_num_local_ports, 0x00, 4, 3);
+
+/* cmd_mbox_xm_exists
+ * An XM (eXtanded Mezanine, e.g. used for the XLT) is connected on the board.
+ */
+MLXSW_ITEM32(cmd_mbox, boardinfo, xm_exists, 0x00, 0, 1);
+
+/* cmd_mbox_xm_local_port_entry
+ */
+MLXSW_ITEM_BIT_ARRAY(cmd_mbox, boardinfo, xm_local_port_entry, 0x04, 4, 8);
+
 /* cmd_mbox_boardinfo_intapin
  * When PCIe interrupt messages are being used, this value is used for clearing
  * an interrupt. When using MSI-X, this register is not used.

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

@@ -435,6 +435,8 @@ struct mlxsw_fw_rev {
 	u16 can_reset_minor;
 };
 
+#define MLXSW_BUS_INFO_XM_LOCAL_PORTS_MAX 4
+
 struct mlxsw_bus_info {
 	const char *device_kind;
 	const char *device_name;
@@ -443,7 +445,10 @@ struct mlxsw_bus_info {
 	u8 vsd[MLXSW_CMD_BOARDINFO_VSD_LEN];
 	u8 psid[MLXSW_CMD_BOARDINFO_PSID_LEN];
 	u8 low_frequency:1,
-	   read_frc_capable:1;
+	   read_frc_capable:1,
+	   xm_exists:1;
+	u8 xm_local_ports_count;
+	u8 xm_local_ports[MLXSW_BUS_INFO_XM_LOCAL_PORTS_MAX];
 };
 
 struct mlxsw_hwmon;

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

@@ -1209,6 +1209,30 @@ static int mlxsw_pci_config_profile(struct mlxsw_pci *mlxsw_pci, char *mbox,
 	return mlxsw_cmd_config_profile_set(mlxsw_pci->core, mbox);
 }
 
+static int mlxsw_pci_boardinfo_xm_process(struct mlxsw_pci *mlxsw_pci,
+					  struct mlxsw_bus_info *bus_info,
+					  char *mbox)
+{
+	int count = mlxsw_cmd_mbox_boardinfo_xm_num_local_ports_get(mbox);
+	int i;
+
+	if (!mlxsw_cmd_mbox_boardinfo_xm_exists_get(mbox))
+		return 0;
+
+	bus_info->xm_exists = true;
+
+	if (count > MLXSW_BUS_INFO_XM_LOCAL_PORTS_MAX) {
+		dev_err(&mlxsw_pci->pdev->dev, "Invalid number of XM local ports\n");
+		return -EINVAL;
+	}
+	bus_info->xm_local_ports_count = count;
+	for (i = 0; i < count; i++)
+		bus_info->xm_local_ports[i] =
+			mlxsw_cmd_mbox_boardinfo_xm_local_port_entry_get(mbox,
+									 i);
+	return 0;
+}
+
 static int mlxsw_pci_boardinfo(struct mlxsw_pci *mlxsw_pci, char *mbox)
 {
 	struct mlxsw_bus_info *bus_info = &mlxsw_pci->bus_info;
@@ -1220,7 +1244,8 @@ static int mlxsw_pci_boardinfo(struct mlxsw_pci *mlxsw_pci, char *mbox)
 		return err;
 	mlxsw_cmd_mbox_boardinfo_vsd_memcpy_from(mbox, bus_info->vsd);
 	mlxsw_cmd_mbox_boardinfo_psid_memcpy_from(mbox, bus_info->psid);
-	return 0;
+
+	return mlxsw_pci_boardinfo_xm_process(mlxsw_pci, bus_info, mbox);
 }
 
 static int mlxsw_pci_fw_area_init(struct mlxsw_pci *mlxsw_pci, char *mbox,