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Date:   Mon, 2 Nov 2020 11:47:18 -0800
From:   Jakub Kicinski <kuba@kernel.org>
To:     Hayes Wang <hayeswang@realtek.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.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>,
        Oliver Neukum <oliver@neukum.org>
Subject: Re: [PATCH net-next v2] net/usb/r8153_ecm: support ECM mode for
 RTL8153
Message-ID: <20201102114718.0118cc12@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
In-Reply-To: <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>
        <dc7fd1d4d1c544e8898224c7d9b54bda@realtek.com>
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On Mon, 2 Nov 2020 07:20:15 +0000 Hayes Wang wrote:
> 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.

Oh, I see, I missed that the rtl_get_version() checking is the inverse
of r8152.

> > > +/* 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.

Please create one. (Adding Greg KH to the recipients, in case there is
a reason that USB subsystem doesn't have a common vendor id header.)

Also please make sure to add Oliver to the CC for v3, to make sure the
reuse of CDC_ETHER is okay.