linux-kernel - [PATCH] net: usb: r8152: Add MAC passthrough support for more Lenovo Docks

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Date:   Tue, 16 Nov 2021 22:19:17 +0800
From:   Aaron Ma <aaron.ma@...onical.com>
To:     davem@...emloft.net, kuba@...nel.org, hayeswang@...ltek.com,
        tiwai@...e.de, linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, aaron.ma@...onical.com
Subject: [PATCH] net: usb: r8152: Add MAC passthrough support for more Lenovo Docks

Like ThinkaPad Thunderbolt 4 Dock, more Lenovo docks start to use the original
Realtek USB ethernet chip ID 0bda:8153.

Lenovo Docks always use their own IDs for usb hub, even for older Docks.
If parent hub is from Lenovo, then r8152 should try MAC passthrough.
Verified on Lenovo TBT3 dock too.

Signed-off-by: Aaron Ma <aaron.ma@...onical.com>
---
 drivers/net/usb/r8152.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 4a02f33f0643..f9877a3e83ac 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -9603,12 +9603,9 @@ static int rtl8152_probe(struct usb_interface *intf,
 		netdev->hw_features &= ~NETIF_F_RXCSUM;
 	}
 
-	if (le16_to_cpu(udev->descriptor.idVendor) == VENDOR_ID_LENOVO) {
-		switch (le16_to_cpu(udev->descriptor.idProduct)) {
-		case DEVICE_ID_THINKPAD_THUNDERBOLT3_DOCK_GEN2:
-		case DEVICE_ID_THINKPAD_USB_C_DOCK_GEN2:
-			tp->lenovo_macpassthru = 1;
-		}
+	if (udev->parent &&
+			le16_to_cpu(udev->parent->descriptor.idVendor) == VENDOR_ID_LENOVO) {
+		tp->lenovo_macpassthru = 1;
 	}
 
 	if (le16_to_cpu(udev->descriptor.bcdDevice) == 0x3011 && udev->serial &&
-- 
2.25.1