netdev - [PATCH] cdc_ether|r8152: ThinkPad Hybrid USB-C/A Dock quirk

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Message-Id: <484336aad52d14ccf061b535bc19ef6396ef5120.1741601523.git.p.hahn@avm.de>
Date: Mon, 10 Mar 2025 11:17:35 +0100
From: Philipp Hahn <phahn-oss@....de>
To: netdev@...r.kernel.org,
	linux-usb@...r.kernel.org
Cc: Philipp Hahn <phahn-oss@....de>,
	Leon Schuermann <leon@...currently.online>,
	Jakub Kicinski <kuba@...nel.org>,
	Oliver Neukum <oliver@...kum.org>
Subject: [PATCH] cdc_ether|r8152: ThinkPad Hybrid USB-C/A Dock quirk

Lenovo ThinkPad Hybrid USB-C with USB-A Dock (17ef:a359) is affected by
the same problem as the Lenovo Powered USB-C Travel Hub (17ef:721e):
Both are based on the Realtek RTL8153B chip used to use the cdc_ether
driver. However, using this driver, with the system suspended the device
constantly sends pause-frames as soon as the receive buffer fills up.
This causes issues with other devices, where some Ethernet switches stop
forwarding packets altogether.

Using the Realtek driver (r8152) fixes this issue. Pause frames are no
longer sent while the host system is suspended.

Cc: Leon Schuermann <leon@...currently.online>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Oliver Neukum <oliver@...kum.org> (maintainer:USB CDC ETHERNET DRIVER)
Cc: netdev@...r.kernel.org (open list:NETWORKING DRIVERS)
Link: https://git.kernel.org/netdev/net/c/cb82a54904a9
Link: https://git.kernel.org/netdev/net/c/2284bbd0cf39
Link: https://www.lenovo.com/de/de/p/accessories-and-software/docking/docking-usb-docks/40af0135eu
Signed-off-by: Philipp Hahn <phahn-oss@....de>
---
 drivers/net/usb/cdc_ether.c | 7 +++++++
 drivers/net/usb/r8152.c     | 6 ++++++
 drivers/net/usb/r8153_ecm.c | 6 ++++++
 3 files changed, 19 insertions(+)

diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c
index a6469235d904..a032c1ded406 100644
--- a/drivers/net/usb/cdc_ether.c
+++ b/drivers/net/usb/cdc_ether.c
@@ -783,6 +783,13 @@ static const struct usb_device_id	products[] = {
 	.driver_info = 0,
 },
 
+/* Lenovo ThinkPad Hybrid USB-C with USB-A Dock (40af0135eu, based on Realtek RTL8153) */
+{
+	USB_DEVICE_AND_INTERFACE_INFO(LENOVO_VENDOR_ID, 0xa359, USB_CLASS_COMM,
+			USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
+	.driver_info = 0,
+},
+
 /* Aquantia AQtion USB to 5GbE Controller (based on AQC111U) */
 {
 	USB_DEVICE_AND_INTERFACE_INFO(AQUANTIA_VENDOR_ID, 0xc101,
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 468c73974046..96fa3857d8e2 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -785,6 +785,7 @@ enum rtl8152_flags {
 #define DEVICE_ID_THINKPAD_USB_C_DONGLE			0x720c
 #define DEVICE_ID_THINKPAD_USB_C_DOCK_GEN2		0xa387
 #define DEVICE_ID_THINKPAD_USB_C_DOCK_GEN3		0x3062
+#define DEVICE_ID_THINKPAD_HYBRID_USB_C_DOCK		0xa359
 
 struct tally_counter {
 	__le64	tx_packets;
@@ -9787,6 +9788,7 @@ static bool rtl8152_supports_lenovo_macpassthru(struct usb_device *udev)
 		case DEVICE_ID_THINKPAD_USB_C_DOCK_GEN2:
 		case DEVICE_ID_THINKPAD_USB_C_DOCK_GEN3:
 		case DEVICE_ID_THINKPAD_USB_C_DONGLE:
+		case DEVICE_ID_THINKPAD_HYBRID_USB_C_DOCK:
 			return 1;
 		}
 	} else if (vendor_id == VENDOR_ID_REALTEK && parent_vendor_id == VENDOR_ID_LENOVO) {
@@ -10064,6 +10066,8 @@ static const struct usb_device_id rtl8152_table[] = {
 	{ USB_DEVICE(VENDOR_ID_MICROSOFT, 0x0927) },
 	{ USB_DEVICE(VENDOR_ID_MICROSOFT, 0x0c5e) },
 	{ USB_DEVICE(VENDOR_ID_SAMSUNG, 0xa101) },
+
+	/* Lenovo */
 	{ USB_DEVICE(VENDOR_ID_LENOVO,  0x304f) },
 	{ USB_DEVICE(VENDOR_ID_LENOVO,  0x3054) },
 	{ USB_DEVICE(VENDOR_ID_LENOVO,  0x3062) },
@@ -10074,7 +10078,9 @@ static const struct usb_device_id rtl8152_table[] = {
 	{ USB_DEVICE(VENDOR_ID_LENOVO,  0x720c) },
 	{ USB_DEVICE(VENDOR_ID_LENOVO,  0x7214) },
 	{ USB_DEVICE(VENDOR_ID_LENOVO,  0x721e) },
+	{ USB_DEVICE(VENDOR_ID_LENOVO,  0xa359) },
 	{ USB_DEVICE(VENDOR_ID_LENOVO,  0xa387) },
+
 	{ USB_DEVICE(VENDOR_ID_LINKSYS, 0x0041) },
 	{ USB_DEVICE(VENDOR_ID_NVIDIA,  0x09ff) },
 	{ USB_DEVICE(VENDOR_ID_TPLINK,  0x0601) },
diff --git a/drivers/net/usb/r8153_ecm.c b/drivers/net/usb/r8153_ecm.c
index 20b2df8d74ae..8d860dacdf49 100644
--- a/drivers/net/usb/r8153_ecm.c
+++ b/drivers/net/usb/r8153_ecm.c
@@ -135,6 +135,12 @@ static const struct usb_device_id products[] = {
 				      USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
 	.driver_info = (unsigned long)&r8153_info,
 },
+/* Lenovo ThinkPad Hybrid USB-C with USB-A Dock (40af0135eu, based on Realtek RTL8153) */
+{
+	USB_DEVICE_AND_INTERFACE_INFO(VENDOR_ID_LENOVO, 0xa359, USB_CLASS_COMM,
+				      USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
+	.driver_info = (unsigned long)&r8153_info,
+},
 
 	{ },		/* END */
 };
-- 
2.34.1