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

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Message-ID: <CAJ3xEMiVUqTw-0cykq1x+kv3xKeD463TgmqOHypvy+ybPOVndg@mail.gmail.com>
Date:	Tue, 8 Dec 2015 23:23:31 +0200
From:	Or Gerlitz <gerlitz.or@...il.com>
To:	Joe Stringer <joe@....org>
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>,
	Jarno Rajahalme <jarno@....org>
Subject: Re: OVS VXLAN decap rule has full match on TTL for the outer headers?

On Tue, Dec 8, 2015 at 9:20 PM, Joe Stringer <joe@....org> wrote:
> 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().

to make sure I follow, will that have the consequence that we (user +
kernel) will practically not be testing the ttl for these flows?

> 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).

OK, for the sake of double checking, I will do over-all cleanup and
re-check, but will be able to do that only next week.
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