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Date:   Sat, 31 Oct 2020 16:08:38 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Hayes Wang <hayeswang@...ltek.com>
Cc:     <netdev@...r.kernel.org>, <nic_swsd@...ltek.com>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH net-next v2] net/usb/r8153_ecm: support ECM mode for
 RTL8153

On Fri, 30 Oct 2020 11:23:08 +0800 Hayes Wang wrote:
> Support ECM mode based on cdc_ether with relative mii functions,
> when CONFIG_USB_RTL8152 is not set, or the device is not supported
> by r8152 driver.
> 
> Signed-off-by: Hayes Wang <hayeswang@...ltek.com>

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?

> +/* 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?

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