netdev - IPv6 xfrm GSO fragmentation bug

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Date:	Sun, 30 Aug 2015 16:24:32 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Steffen Klassert <steffen.klassert@...unet.com>,
	netdev@...r.kernel.org
Subject: IPv6 xfrm GSO fragmentation bug

Hi Steffen:

I received a bug report regarding poor IPComp performance over
IPv6:

	https://bugzilla.redhat.com/show_bug.cgi?id=1257952

It appears to have been caused by

commit dd767856a36e00b631d65ebc4bb81b19915532d6
Author: Steffen Klassert <steffen.klassert@...unet.com>
Date:   Tue Oct 11 01:44:30 2011 +0000

    xfrm6: Don't call icmpv6_send on local error

which addded an MTU check without a GSO override.

Fixing it obviously isn't difficult, but I am wondering why I
can't find a corresponding patch for IPv4.  Do we need that check
to be present in xfrm6_output at all? If we do why isn't it needed
for IPv4 as well?

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
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