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Date:   Fri, 24 Nov 2017 09:29:28 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Kai Heng Feng <kai.heng.feng@...onical.com>
Cc:     David Miller <davem@...emloft.net>, hayeswang@...ltek.co,
        linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Mario Limonciello <mario.limonciello@...l.com>
Subject: Re: [PATCH] r8152: disable rx checksum offload on Dell TB dock

On Fri, Nov 24, 2017 at 09:28:05AM +0100, Greg KH wrote:
> On Fri, Nov 24, 2017 at 11:44:02AM +0800, Kai Heng Feng wrote:
> > 
> > 
> > > On 23 Nov 2017, at 5:24 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
> > > 
> > > On Thu, Nov 23, 2017 at 04:53:41PM +0800, Kai Heng Feng wrote:
> > >> 
> > >> What I want to do here is to finding this connection:
> > >> Realtek r8153 <-> SMSC hub (USD ID: 0424:5537) <-> 
> > >> ASMedia XHCI controller (PCI ID: 1b21:1142).
> > >> 
> > >> Is there a safer way to do this?
> > > 
> > > Nope!  You can't do that at all from within a USB driver, sorry.  As you
> > > really should not care at all :)
> > 
> > Got it :)
> > 
> > The r8153 in Dell TB dock has version information, RTL_VER_05.
> > We can use it to check for workaround, but many working RTL_VER_05 devices
> > will also be affected.
> > Do you think it’s an acceptable compromise?
> 
> I think all of the users of this device that is working just fine for
> them would not like that to happen :(
> 
> > >> I have a r8153 <-> USB 3.0 dongle which work just fine. I can’t find any 
> > >> information to differentiate them. Hence I want to use the connection to
> > >> identify if r8153 is on a Dell TB dock.
> > > 
> > > Are you sure there is nothing different in the version or release number
> > > of the device?  'lsusb -v' shows the exact same information for both
> > > devices?
> > 
> > Yes. I attached `lsusb -v` for r8153 on Dell TB dock, on a RJ45 <-> USB 3.0 dongle,
> > and on a RJ45 <-> USB Type-C dongle.
> 
> The bcdDevice is different between the dock device and the "real"
> device, why not use that?

Also the MAC address is different, can you just trigger off of Dell's
MAC address space instead of the address space of the dongle device?

thanks,

greg k-h

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