[ovs-discuss] How to buffer on OVS

[Hiroshi Miyata]

Hi Ben,

(13/05/03 2:35), Ben Pfaff wrote:
> Let me rephrase.
>
> Do these packet_in messages result from an OFPAT_OUTPUT action that
> use OFPP_CONTROLLER as the output port?
Yes,
However, the reason code in the packet_in  was OFPR_ACTION (0x01) rather 
than OFPR_NO_MATCH (0x00).

I have investigated if some unexpected flow entries exists.
With my investigation, only the flow_mod of table-miss is accepted.

Other flow_mods for (NS, NA, ICMPv6 echo_req, ICMPv6 echo_rep) causesed 
error with
the reason of "unsupported field type in the match". (I used only ping6 
application for this investigation)
Therefore, I believe the switch has only one flow_entry of table-miss.

Thanks,

...hiroshi miyata

> On Thu, May 02, 2013 at 06:49:16PM +0900, Hiroshi Miyata wrote:
>> HI Ben,
>>
>> Indeed, I could not answer you directly, since I had been a bit confused.
>> Sorry about that.
>> Here is my answer, I apologize if I have not understood your point
>> correctly.
>>
>>> Are these packets from flow misses or as a result of output to
>> OFPP_CONTROLLER?
>>
>> (I guess, you mean "table-miss" with "flow miss").
>> Yes, it is the result of table-miss entry, since the controller put
>> only one entry, which has priority 0.
>> And it is output to OFPP_CONTROLLER (0xfffffffd).
>> (Is there any possibility to output packet_in other than OFPP_CONTROLLER?
>>   I am understanding that all packet_in messages are output to
>> OFPP_CONTROLLER.
>>   Am I correct? I was confused here.....)
>>
>> I hope this answers to you correctly.
>>
>> Best Regards,
>>
>> ...hiroshi miyata
>>
>>
>>
>> (13/05/02 0:32), Ben Pfaff wrote:
>>> You did not answer my question.  Are these packets from flow misses or
>>> as a result of output toOFPP_CONTROLLER?  OVS only buffers packets that
>>> result from flow misses.
>>>
>>> On Wed, May 01, 2013 at 09:30:58PM +0900, Hiroshi Miyata wrote:
>>>> Hi Ben,
>>>>
>>>> First, I need to say I am using OpenFlow 1.3.
>>>>
>>>> I am relieved to hear OVS should buffer.
>>>> I guess there are some misunderstanding in my side.
>>>>
>>>> But at least what I am facing is difference between
>>>> switch at trema-edge and ovs.
>>>> With same controller, the switch from trema-edge specifies buffer_id
>>>> while ovs does not.
>>>>
>>>> I will send you the captured packets personally, I appreciate very
>>>> much for your investigataion.
>>>>
>>>> Best Regards,
>>>>
>>>> ...hiroshi miyata
>>>>
>>>>
>>>>
>>>> (13/05/01 1:57), Ben Pfaff wrote:
>>>>> On Tue, Apr 30, 2013 at 03:02:46PM +0900, Hiroshi Miyata wrote:
>>>>>> I am now trying to run OVS of Kernel module with
>>>>>> Trema-edge(learning_switch code).
>>>>>> Both are in a box. (Ubuntu 12.10)
>>>>>>
>>>>>> When I see the of13 packets, the buffer_id in packet_in messages are
>>>>>> 0xffffffff(OPF_NO_BUFFER)
>>>>>> for both IPv4 packets and IPv6 packets.
>>>>>> Is it possible to make OVS buffer the packets?
>>>>> OVS should be buffering packets.  I am surprised to hear that it is
>>>>> not.
>>>>>
>>>>> Are these packets from flow misses or as a result of output to
>>>>> OFPP_CONTROLLER?  OVS only buffers packets that result from flow misses.