netdev - Re: change the way e1000 is handling short VLAN frames

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Message-ID: <46F3E695.7010604@candelatech.com>
Date:	Fri, 21 Sep 2007 08:43:17 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	hadi@...erus.ca
CC:	Emil Micek <emil.micek@...jasek.cz>,
	"auke-jan.h.kok@...el.com" <auke-jan.h.kok@...el.com>,
	netdev mailing list <netdev@...r.kernel.org>
Subject: Re: change the way e1000 is handling short VLAN frames

jamal wrote:
> On Fri, 2007-21-09 at 09:37 -0400, jamal wrote:
>   
>> On Fri, 2007-21-09 at 14:50 +0200, Emil Micek wrote:
>>     
>>> On Fri, 2007-09-21 at 07:59 -0400, jamal wrote:
>>>       
>>>> Which would make it a bug. AFAIK, the minimum VLAN tagged packet going
>>>> out is 68 bytes.
>>>>         
>>> Are you sure about this? 
>>>       
>> This is what i have always seen. 
>>     
>
> If the first email caused confusion - so will this ;->
> I have never used e1000 for vlan tagging. My view is that if it emits
> (instead of 68B) 64B packets with tags then it is buggy and needs to be
> fixed. Hope that makes sense.
>   
I just re-read the spec, and a bridge *may* pad up to 68, but it is not 
required.
On page 166, it says equipment must be able to handle 64 byte minimums.

See page 22 (section 7.2) of this document:

http://standards.ieee.org/getieee802/download/802.1Q-1998.pdf

Also, page 63, 165, 166

Thanks,
Ben

>
> cheers,
> jamal
>
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>   


-- 
Ben Greear <greearb@...delatech.com> 
Candela Technologies Inc  http://www.candelatech.com


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