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

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Message-ID: <1353114559.10798.66.camel@edumazet-glaptop>
Date:	Fri, 16 Nov 2012 17:09:19 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-net-drivers@...arflare.com,
	Andrew Gallatin <gallatin@...i.com>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [PATCH net-next] gro: Handle inline VLAN tags

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.




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