netdev - RE: Realtek r8168C / r8169 driver VLAN TAG stripping

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Message-ID: <BFBA3A0B2A4B4E8B8798977086BFC4C9@realtek.com.tw>
Date:	Mon, 31 Jan 2011 13:45:48 +0800
From:	hayeswang <hayeswang@...ltek.com>
To:	'Francois Romieu' <romieu@...zoreil.com>,
	'Anand Raj Manickam' <anandrm@...il.com>
CC:	<netdev@...r.kernel.org>, 'Ivan Vecera' <ivecera@...hat.com>
Subject: RE: Realtek r8168C / r8169 driver VLAN TAG stripping


> Reading my rev1.0 8168c datasheet from may 2007, when there 
> is no tx offload, no checksumming, the tx descriptor layout 
> should be the same as the perennial 8169 tx descriptor layout.
> 
> Either (1) the VLAN registers and descriptor layout is 
> different for this chipset or (2) something prevents the 
> register / descriptor write (read ?) to be completely 
> effective or (3) there is something beyond the 8168 or
> (4) there is a 8168 hardware bug.
> 
> 1 : Hayes may answer. You can give Realtek's own driver a try btw.
> 2 : Seen before. It could be a software or a (non-8168) hardware one.
>     I have no idea if your hardware setup includes a single card with
>     four ports or four independent cards with their own 8168 or worse.
> 3 : See the hardware setup part of (2).
> 4 : I don't hope so. Hayes may answer as well.
> 

I find nothing wrong for the source code of kernel. I think it should work. Only
the tx descriptor need to be set for the tx. For the receiving, the register
0xe0 (CPlusCmd) bit 6 (RxVlan) should be set. That is all. And I don't get any
information about hardware bug, so I really don't know what's wrong. I will
check it after the vacation of Chinese New Year.
 
Best Regards,
Hayes

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