On 11/19/12 19:10, David Miller wrote:

From: Eric Dumazet <redacted>
Date: Fri, 16 Nov 2012 17:09:19 -0800

quoted

On Sat, 2012-11-17 at 00:32 +0000, Ben Hutchings wrote:

quoted

On Fri, 2012-11-16 at 16:16 -0800, Eric Dumazet wrote:

quoted

On Sat, 2012-11-17 at 00:00 +0000, Ben Hutchings wrote:

quoted

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