netdev - Re: [PATCH net-next] ipv6: gro: support sit protocol

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Message-ID: <1446640851.4184.20.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 04 Nov 2015 04:40:51 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Wolfgang Walter <linux@...m.de>
Cc:	David Miller <davem@...emloft.net>, Jerry Chu <hkchu@...gle.com>,
	JesseGross <jesse@...ira.com>, Tom Herbert <tom@...bertland.com>,
	netdev <netdev@...r.kernel.org>, kernel-team@...com,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [PATCH net-next] ipv6: gro: support sit protocol

On Wed, 2015-11-04 at 13:19 +0100, Wolfgang Walter wrote:

> Today I found a problem: on a router forwarding GRE-packets (ipv4) (it is not 
> the endpount) the interface (intel igb) stops sending packets after some time. 
> I think this happens when an ISATAP packet is inside the GRE-packet.
> 
> 	gre packets arrives on eth0
> 	eth1 stops sending (receiving still works)
> 	ethtool -r eth1
> 	eth1 works again for some time
> 
> Switching GRO off on eth0 "fixes" the problem.
> 
> I didn't test vanilla 4.1.12 yet, though. Until today 4.1.11 has been running 
> on the router. What I tested was your patch
> 	"gre_gso_segment() chokes if SIT frames were aggregated by GRO engine."
> but did not solve the problem.
> 
> So I would not recommend to backport it to longterm 4.1.
> 
> My plans are:
> 
> * test vanilla 4.1.12
> * test 4.3
> 
> I want to test 4.3 on another router first, though.

If the NIC stops sending packets after some time, it might be an igb
issue.


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