netdev - Re: [bisected] xfrm: TCP connection initiating PMTU discovery stalls on v3.

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Date:	Fri, 12 Dec 2014 09:27:05 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Wolfgang Walter <linux@...m.de>
Cc:	Thomas Jarosch <thomas.jarosch@...ra2net.com>,
	netdev@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Steffen Klassert <steffen.klassert@...unet.com>
Subject: Re: [bisected] xfrm: TCP connection initiating PMTU discovery
 stalls on v3.

On Fri, 2014-12-12 at 17:58 +0100, Wolfgang Walter wrote:

> This fixes hangs of local tcp connections over ipsec tunnels where
> pmtu is lower than the mtu of the interface.

Again this is a work around, the one liner patch is not a clean patch.

Something is wrong, we should fix GSO path instead.

Why ? Because we can queue a GSO packet in a qdisc, then later call
sk_setup_caps() (too late)


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