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From:   Hayes Wang <hayeswang@realtek.com>
To:     Jakub Kicinski <kuba@kernel.org>
CC:     "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        nic_swsd <nic_swsd@realtek.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
Subject: RE: [PATCH net-next v2] net/usb/r8153_ecm: support ECM mode for RTL8153
Thread-Topic: [PATCH net-next v2] net/usb/r8153_ecm: support ECM mode for
 RTL8153
Thread-Index: AQHWrmwDnKDexsPDxUiMgOTBbfR/C6mx0pMAgAJFC4A=
Date:   Mon, 2 Nov 2020 07:20:15 +0000
Message-ID: <dc7fd1d4d1c544e8898224c7d9b54bda@realtek.com>
References: <1394712342-15778-387-Taiwan-albertk@realtek.com>
        <1394712342-15778-388-Taiwan-albertk@realtek.com>
 <20201031160838.39586608@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
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Jakub Kicinski <kuba@kernel.org>
[...]
> Can you describe the use case in more detail?
> 
> AFAICT r8152 defines a match for the exact same device.
> Does it not mean that which driver is used will be somewhat random
> if both are built?

I export rtl_get_version() from r8152. It would return none zero
value if r8152 could support this device. Both r8152 and r8153_ecm
would check the return value of rtl_get_version() in porbe().
Therefore, if rtl_get_version() return none zero value, the r8152
is used for the device with vendor mode. Otherwise, the r8153_ecm
is used for the device with ECM mode.

> > +/* Define these values to match your device */
> > +#define VENDOR_ID_REALTEK		0x0bda
> > +#define VENDOR_ID_MICROSOFT		0x045e
> > +#define VENDOR_ID_SAMSUNG		0x04e8
> > +#define VENDOR_ID_LENOVO		0x17ef
> > +#define VENDOR_ID_LINKSYS		0x13b1
> > +#define VENDOR_ID_NVIDIA		0x0955
> > +#define VENDOR_ID_TPLINK		0x2357
> 
> $ git grep 0x2357 | grep -i tplink
> drivers/net/usb/cdc_ether.c:#define TPLINK_VENDOR_ID	0x2357
> drivers/net/usb/r8152.c:#define VENDOR_ID_TPLINK		0x2357
> drivers/usb/serial/option.c:#define TPLINK_VENDOR_ID			0x2357
> 
> $ git grep 0x17ef | grep -i lenovo
> drivers/hid/hid-ids.h:#define USB_VENDOR_ID_LENOVO		0x17ef
> drivers/hid/wacom.h:#define USB_VENDOR_ID_LENOVO	0x17ef
> drivers/net/usb/cdc_ether.c:#define LENOVO_VENDOR_ID	0x17ef
> drivers/net/usb/r8152.c:#define VENDOR_ID_LENOVO		0x17ef
> 
> Time to consolidate those vendor id defines perhaps?

It seems that there is no such header file which I could include
or add the new vendor IDs.

Best Regards,
Hayes