netdev - Re: [PATCH] sky2: fix receive length error in mixed non-VLAN/VLAN traffic

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Date:	Fri, 27 Apr 2012 20:05:36 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Niccolò Belli <darkbasic@...uxsystems.it>,
	netdev@...r.kernel.org
Subject: Re: [PATCH] sky2:  fix receive length error in mixed non-VLAN/VLAN
 traffic

On Fri, 27 Apr 2012 20:03:10 -0700
Stephen Hemminger <shemminger@...tta.com> wrote:

> Bug: The VLAN bit of the MAC RX Status Word is unreliable in several older
> supported chips. Sometimes the VLAN bit is not set for valid VLAN packets
> and also sometimes the VLAN bit is set for non-VLAN packets that came after
> a VLAN packet. This results in a receive length error when VLAN hardware
> tagging is enabled.
> 
> Fix: The driver uses only VLAN information included in VLAN status list elements,
> that signals that the VLAN tag field is valid. It must ignore the VLAN bit in the
> MAC RX Status Word. An additional variable set when evaluating the VLAN opcodes
> is used to indicate that the received packet is a VLAN packet and a packet length
> correction (subtraction of VLAN header length) must be done.
> 
> This is an alternative to Mirko's patch that relies on the new method of
> encoding VLAN tag, and therefore means extra code can be removed.
> 
> Testing: Tested with regular and VLAN traffic on 88E8056, but this chip
> does not have the bug, just proves that the alternative method of handling
> VLAN tag will work.
> 
> Reported-by: Mirko Lindner <mlindner@...vell.com>
> Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
> 

This doesn't work. Furthur testing just crapped out with lots
of rx length errors in mixed vlan/non-vlan traffic case.
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