linux-kernel - Re: [PATCH] net: usb: r8152: Add MAC passthrough support for RTL8153BL

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Message-ID: <e75d006c-c9ae-9479-28b4-4cdacf1c51db@canonical.com>
Date:   Fri, 28 Jan 2022 12:19:38 +0800
From:   Aaron Ma <aaron.ma@...onical.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Mario.Limonciello@....com, kuba@...nel.org,
        henning.schild@...mens.com, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net, hayeswang@...ltek.com, tiwai@...e.de
Subject: Re: [PATCH] net: usb: r8152: Add MAC passthrough support for
 RTL8153BL


On 1/27/22 22:19, Andrew Lunn wrote:
> On Thu, Jan 27, 2022 at 06:01:09PM +0800, Aaron Ma wrote:
>> RTL8153-BL is used in Lenovo Thunderbolt4 dock.
>> Add the support of MAC passthrough.
>> This is ported from Realtek Outbox driver r8152.53.56-2.15.0.
>>
>> There are 2 kinds of rules for MAC passthrough of Lenovo products,
>> 1st USB vendor ID belongs to Lenovo, 2nd the chip of RTL8153-BL
>> is dedicated for Lenovo. Check the ocp data first then set ACPI object
>> names.
>>
>> Suggested-by: Hayes Wang <hayeswang@...ltek.com>
>> Signed-off-by: Aaron Ma <aaron.ma@...onical.com>
>> ---
>>   drivers/net/usb/r8152.c | 44 ++++++++++++++++++++++-------------------
>>   1 file changed, 24 insertions(+), 20 deletions(-)
>>
>> diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
>> index ee41088c5251..df997b330ee4 100644
>> --- a/drivers/net/usb/r8152.c
>> +++ b/drivers/net/usb/r8152.c
>> @@ -718,6 +718,7 @@ enum spd_duplex {
>>   #define AD_MASK			0xfee0
>>   #define BND_MASK		0x0004
>>   #define BD_MASK			0x0001
>> +#define BL_MASK                 BIT(3)
> 
> Just to be sure, this is defined by Realtek? This is not just Lenovo
> just misusing a reserved bit?
> 

 From what I know, It's defined by Realtek to identify customized product.
It shouldn't be misusing.
Also it's used by Realtek outbox driver.

Aaron

>       Andrew