netdev - Re: OVS VXLAN decap rule has full match on TTL for the outer headers?

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Date:	Tue, 8 Dec 2015 11:20:42 -0800
From:	Joe Stringer <joe@....org>
To:	Or Gerlitz <gerlitz.or@...il.com>
Cc:	Jesse Gross <jesse@...nel.org>, Or Gerlitz <ogerlitz@...lanox.com>,
	Haggai Eran <haggaie@...lanox.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Ilya Lesokhin <ilyal@...lanox.com>,
	Rony Efraim <ronye@...lanox.com>,
	Hadar Hen Zion <hadarh@...lanox.com>,
	Tal Anker <Ankertal@...lanox.com>, Joe Stringer <joe@....org>,
	Jarno Rajahalme <jarno@....org>
Subject: Re: OVS VXLAN decap rule has full match on TTL for the outer headers?

On 2 December 2015 at 10:01, Joe Stringer <joe@....org> wrote:
> On 29 November 2015 at 05:37, Or Gerlitz <gerlitz.or@...il.com> wrote:
>> On Thu, Nov 19, 2015 at 5:40 PM, Or Gerlitz <gerlitz.or@...il.com> wrote:
>>> On Sat, Nov 14, 2015 at 8:45 AM, Joe Stringer <joestringer@...ira.com> wrote:
>>>> On 13 November 2015 at 06:46, Or Gerlitz <gerlitz.or@...il.com> wrote:
>>>>> On Fri, Nov 13, 2015 at 10:14 AM, Joe Stringer <joestringer@...ira.com> wrote:
>>>
>>>>>> I agree that this UNSPEC issue on v2.3 could do with a bit of a closer
>>>>>> look. I'll see if I can find some time for it. Alternatively if you're
>>>>>> willing and have bandwith, I'd be curious if it's related to the
>>>>>> masked set field feature introduced in Linux-4.0.
>>>
>>>>> so what would you suggest here? run with 3.19 or earlier?
>>>
>>>> On second thought, I think if it were related to that then userspace
>>>> v2.4 would not exhibit the problem. I'd have to dig in to see why it
>>>> occurs.
>>>
>>> Any findings?
>>
>> Hi Joe/Jesse,
>>
>> Apart from Haggai's note on the TTL, I am pinging you here for the 2nd
>> time... can you please let me know how
>> this goes on your end?
>
> Apologies for the delayed response, we haven't found anything
> interesting yet although we've mostly looked at plain set-field
> actions with a combination of kernel/userspace versions. I plan to
> carve out some time later this week to take another look.

(resending due to teething issues with new email and plain-text, sorry
for the spam)

As far as the mask, I briefly discussed this with Jarno and it seems
like it could be something as simple as zeroing the ip_ttl mask in
tnl_wc_init().

As far as the UNSPEC issue, I couldn't reproduce it. Are you sure that
there weren't multiple versions of OVS installed, and while the OVS
running was v2.3, your ovs-dpctl was an older version? I was running
latest OVS branch-2.3 (c2e761f5b152).
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