netdev - [PATCH 1/1] r8152: Add Lenovo Powered USB-C Travel Hub

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Message-Id: <20210108202727.11728-2-leon@is.currently.online>
Date:   Fri,  8 Jan 2021 21:27:27 +0100
From:   Leon Schuermann <leon@...currently.online>
To:     oliver@...kum.org, davem@...emloft.net
Cc:     hayeswang@...ltek.com, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org, Leon Schuermann <leon@...currently.online>
Subject: [PATCH 1/1] r8152: Add Lenovo Powered USB-C Travel Hub

This USB-C Hub (17ef:721e) based on the Realtek RTL8153B chip used to
work with the cdc_ether driver. However, using this driver, with the
system suspended the device sends pause-frames as soon as the receive
buffer fills up. This produced substantial network load, up to the
point where some Ethernet switches stopped processing packets
altogether.

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

Signed-off-by: Leon Schuermann <leon@...currently.online>
Tested-by: Leon Schuermann <leon@...currently.online>
---
 drivers/net/usb/cdc_ether.c | 7 +++++++
 drivers/net/usb/r8152.c     | 1 +
 2 files changed, 8 insertions(+)

diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c
index 8c1d61c2cbac..6aaa0675c28a 100644
--- a/drivers/net/usb/cdc_ether.c
+++ b/drivers/net/usb/cdc_ether.c
@@ -793,6 +793,13 @@ static const struct usb_device_id	products[] = {
 	.driver_info = 0,
 },
 
+/* Lenovo Powered USB-C Travel Hub (4X90S92381, based on Realtek RTL8153) */
+{
+	USB_DEVICE_AND_INTERFACE_INFO(LENOVO_VENDOR_ID, 0x721e, USB_CLASS_COMM,
+			USB_CDC_SUBCLASS_ETHERNET, USB_CDC_PROTO_NONE),
+	.driver_info = 0,
+},
+
 /* ThinkPad USB-C Dock Gen 2 (based on Realtek RTL8153) */
 {
 	USB_DEVICE_AND_INTERFACE_INFO(LENOVO_VENDOR_ID, 0xa387, USB_CLASS_COMM,
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index c448d6089821..67cd6986634f 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -6877,6 +6877,7 @@ static const struct usb_device_id rtl8152_table[] = {
 	{REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x7205)},
 	{REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x720c)},
 	{REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x7214)},
+	{REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0x721e)},
 	{REALTEK_USB_DEVICE(VENDOR_ID_LENOVO,  0xa387)},
 	{REALTEK_USB_DEVICE(VENDOR_ID_LINKSYS, 0x0041)},
 	{REALTEK_USB_DEVICE(VENDOR_ID_NVIDIA,  0x09ff)},
-- 
2.29.2