netdev - Re: [PATCH net] ipv6: update skb->csum when CE mark is propagated

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Date:	Fri, 15 Jan 2016 21:45:15 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Tom Herbert <tom@...bertland.com>
Subject: Re: [PATCH net] ipv6: update skb->csum when CE mark is propagated

On Fri, Jan 15, 2016 at 04:56:56AM -0800, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> When a tunnel decapsulates the outer header, it has to comply
> with RFC 6080 and eventually propagate CE mark into inner header.
> 
> It turns out IP6_ECN_set_ce() does not correctly update skb->csum
> for CHECKSUM_COMPLETE packets, triggering infamous "hw csum failure"
> messages and stack traces.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Good catch!

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt