netdev - Re: [PATCH net-next] gro: Handle inline VLAN tags

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Date:	Mon, 26 Nov 2012 10:04:44 -0500
From:	Andrew Gallatin <gallatin@...i.com>
To:	David Miller <davem@...emloft.net>
CC:	eric.dumazet@...il.com, bhutchings@...arflare.com,
	netdev@...r.kernel.org, linux-net-drivers@...arflare.com,
	herbert@...dor.hengli.com.au
Subject: Re: [PATCH net-next] gro: Handle inline VLAN tags

On 11/19/12 19:10, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Fri, 16 Nov 2012 17:09:19 -0800
>
>> On Sat, 2012-11-17 at 00:32 +0000, Ben Hutchings wrote:
>>> On Fri, 2012-11-16 at 16:16 -0800, Eric Dumazet wrote:
>>>> On Sat, 2012-11-17 at 00:00 +0000, Ben Hutchings wrote:
>>>>
>>>>> I'm not sure what you mean by this.  Is your point that the
>>>>> copy-on-write is never needed?  It is still possible for pskb_may_pull()
>>>>> to fail.
>>>>>
>>>>
>>>> A packet sniffer should have a copy of bad frames, even if dropped later
>>>> in our stacks.
>>>>
>>>> GRO layer is not allowed to drop a frame, even if not 'correct'.
>>>
>>> What do you think the accelerated hardware does with frames that have a
>>> truncated VLAN tag?
>>
>> The hardware should send us the frame, exactly like when RX checksum is
>> wrong.
>
> I agree with Eric, and therefore will not apply this patch.
>

David,

How do you feel about the patchset I posted on 11/14/2012
([PATCH net-next 0/3] myri10ge: LRO to GRO conversion,
http://marc.info/?l=linux-netdev&m=135289838223920&w=2)
which moves myri10ge from LRO to GRO?

Specifically, if doing vlan decap in GRO is not OK, then how
about doing it in the driver?

BTW, if I have bungled something it the myri10ge patchset submission,
I do apologize. I don't frequently submit patches, and it is likely
I screwed up some convention..

Thanks,

Drew
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