netdev - Re: [PATCH 2/2] net: ip, ipv6: handle gso skbs in forwarding path

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Message-ID: <20140210125049.GB28752@gondor.apana.org.au>
Date:	Mon, 10 Feb 2014 20:50:49 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Florian Westphal <fw@...len.de>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Subject: Re: [PATCH 2/2] net: ip, ipv6: handle gso skbs in forwarding path

On Mon, Feb 10, 2014 at 01:43:46PM +0100, Florian Westphal wrote:
>
> Eric suggested to shrink gso_size instead to avoid segmentation+fragments.
> I think its nice idea, but skb_gso_segment makes certain assumptions about
> nr_frags and gso_size (it can't handle frag size > desired mss).

This breaks the most important assumption behind GRO which is
to preserve end-to-end connectivity.  Resegmenting packets as
suggested on a router/bridge is just wrong.

Cheers,
-- 
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
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