netdev - Re: [bisected] ICMP fragmentation needed ignored / PMTU discovery broken since 3.19-rc7

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Date:	Wed, 29 Apr 2015 14:43:52 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	gerd.von.egidy@...ra2net.com, netdev@...r.kernel.org,
	lw@...fujitsu.com
Subject: Re: [bisected] ICMP fragmentation needed ignored / PMTU discovery
 broken since 3.19-rc7

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Tue, 28 Apr 2015 11:43:15 +0800

> Subject: route: Use ipv4_mtu instead of raw rt_pmtu
> 
> The commit 3cdaa5be9e81a914e633a6be7b7d2ef75b528562 ("ipv4: Don't
> increase PMTU with Datagram Too Big message") broke PMTU in cases
> where the rt_pmtu value has expired but is smaller than the new
> PMTU value.
> 
> This obsolete rt_pmtu then prevents the new PMTU value from being
> installed.
> 
> Fixes: 3cdaa5be9e81 ("ipv4: Don't increase PMTU with Datagram Too Big message")
> Reported-by: Gerd v. Egidy <gerd.von.egidy@...ra2net.com>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Applied and queued up for -stable, thanks!
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