linux-kernel - Re: [PATCH AUTOSEL 5.15 23/39] net: usb: r8152: Add MAC passthrough support for more Lenovo Docks

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Message-ID: <c3af6d99-7876-a704-b132-7c0d82b7fe8e@omp.ru>
Date:   Sun, 28 Nov 2021 12:49:04 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Sasha Levin <sashal@...nel.org>, <linux-kernel@...r.kernel.org>,
        <stable@...r.kernel.org>
CC:     Aaron Ma <aaron.ma@...onical.com>,
        "David S . Miller" <davem@...emloft.net>, <kuba@...nel.org>,
        <hayeswang@...ltek.com>, <tiwai@...e.de>,
        <linux-usb@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH AUTOSEL 5.15 23/39] net: usb: r8152: Add MAC passthrough
 support for more Lenovo Docks

Hello!

On 26.11.2021 5:31, Sasha Levin wrote:

> From: Aaron Ma <aaron.ma@...onical.com>
> 
> [ Upstream commit f77b83b5bbab53d2be339184838b19ed2c62c0a5 ]
> 
> 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>
> Signed-off-by: David S. Miller <davem@...emloft.net>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>   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 f329e39100a7d..d3da350777a4d 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;
>   	}

    {} not needed anymore, please remove 'em.

[...]

MBR, Sergey