r8152: Add macpassthru support for ThinkPad Thunderbolt 3 Dock Gen 2

ThinkPad Thunderbolt 3 Dock Gen 2 is another docking station that uses
RTL8153 based USB ethernet.

The device supports macpassthru, but it failed to pass the test of -AD,
-BND and -BD. Simply bypass these tests since the device supports this
feature just fine.

Also the ACPI objects have some differences between Dell's and Lenovo's,
so make those ACPI infos no longer hardcoded.

BugLink: https://bugs.launchpad.net/bugs/1827961
Signed-off-by: Kai-Heng Feng <[e-mail]>
Acked-by: Hayes Wang <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/usb/cdc_ether.c

···
 	.driver_info = 0,
 },
 
+/* ThinkPad Thunderbolt 3 Dock Gen 2 (based on Realtek RTL8153) */
+{
+	USB_DEVICE_AND_INTERFACE_INFO(LENOVO_VENDOR_ID, 0x3082, USB_CLASS_COMM,
+			USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
+	.driver_info = 0,
+},
+
 /* Lenovo Thinkpad USB 3.0 Ethernet Adapters (based on Realtek RTL8153) */
 {
 	USB_DEVICE_AND_INTERFACE_INFO(LENOVO_VENDOR_ID, 0x7205, USB_CLASS_COMM,

drivers/net/usb/r8152.c

···
 	SCHEDULE_TASKLET,
 	GREEN_ETHERNET,
 	DELL_TB_RX_AGG_BUG,
+	LENOVO_MACPASSTHRU,
 };
 
 /* Define these values to match your device */
···
 	int ret = -EINVAL;
 	u32 ocp_data;
 	unsigned char buf[6];
+	char *mac_obj_name;
+	acpi_object_type mac_obj_type;
+	int mac_strlen;
 
-	/* test for -AD variant of RTL8153 */
-	ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_MISC_0);
-	if ((ocp_data & AD_MASK) == 0x1000) {
-		/* test for MAC address pass-through bit */
-		ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, EFUSE);
-		if ((ocp_data & PASS_THRU_MASK) != 1) {
-			netif_dbg(tp, probe, tp->netdev,
-				  "No efuse for RTL8153-AD MAC pass through\n");
-			return -ENODEV;
-		}
+	if (test_bit(LENOVO_MACPASSTHRU, &tp->flags)) {
+		mac_obj_name = "\\MACA";
+		mac_obj_type = ACPI_TYPE_STRING;
+		mac_strlen = 0x16;
 	} else {
-		/* test for RTL8153-BND and RTL8153-BD */
-		ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, USB_MISC_1);
-		if ((ocp_data & BND_MASK) == 0 && (ocp_data & BD_MASK) == 0) {
-			netif_dbg(tp, probe, tp->netdev,
-				  "Invalid variant for MAC pass through\n");
-			return -ENODEV;
+		/* test for -AD variant of RTL8153 */
+		ocp_data = ocp_read_word(tp, MCU_TYPE_USB, USB_MISC_0);
+		if ((ocp_data & AD_MASK) == 0x1000) {
+			/* test for MAC address pass-through bit */
+			ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, EFUSE);
+			if ((ocp_data & PASS_THRU_MASK) != 1) {
+				netif_dbg(tp, probe, tp->netdev,
+						"No efuse for RTL8153-AD MAC pass through\n");
+				return -ENODEV;
+			}
+		} else {
+			/* test for RTL8153-BND and RTL8153-BD */
+			ocp_data = ocp_read_byte(tp, MCU_TYPE_USB, USB_MISC_1);
+			if ((ocp_data & BND_MASK) == 0 && (ocp_data & BD_MASK) == 0) {
+				netif_dbg(tp, probe, tp->netdev,
+						"Invalid variant for MAC pass through\n");
+				return -ENODEV;
+			}
 		}
+
+		mac_obj_name = "\\_SB.AMAC";
+		mac_obj_type = ACPI_TYPE_BUFFER;
+		mac_strlen = 0x17;
 	}
 
 	/* returns _AUXMAC_#AABBCCDDEEFF# */
-	status = acpi_evaluate_object(NULL, "\\_SB.AMAC", NULL, &buffer);
+	status = acpi_evaluate_object(NULL, mac_obj_name, NULL, &buffer);
 	obj = (union acpi_object *)buffer.pointer;
 	if (!ACPI_SUCCESS(status))
 		return -ENODEV;
-	if (obj->type != ACPI_TYPE_BUFFER || obj->string.length != 0x17) {
+	if (obj->type != mac_obj_type || obj->string.length != mac_strlen) {
 		netif_warn(tp, probe, tp->netdev,
 			   "Invalid buffer for pass-thru MAC addr: (%d, %d)\n",
 			   obj->type, obj->string.length);
 		goto amacout;
 	}
+
 	if (strncmp(obj->string.pointer, "_AUXMAC_#", 9) != 0 ||
 	    strncmp(obj->string.pointer + 0x15, "#", 1) != 0) {
 		netif_warn(tp, probe, tp->netdev,
···
 		netdev->hw_features &= ~NETIF_F_RXCSUM;
 	}
 
+	if (le16_to_cpu(udev->descriptor.idVendor) == VENDOR_ID_LENOVO &&
+	    le16_to_cpu(udev->descriptor.idProduct) == 0x3082)
+		set_bit(LENOVO_MACPASSTHRU, &tp->flags);
+
 	if (le16_to_cpu(udev->descriptor.bcdDevice) == 0x3011 && udev->serial &&
 	    (!strcmp(udev->serial, "000001000000") ||
 	     !strcmp(udev->serial, "000002000000"))) {
···
 	{REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x304f)},
 	{REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x3062)},
 	{REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x3069)},
+	{REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x3082)},
 	{REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x7205)},
 	{REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x720c)},
 	{REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x7214)},