[ovs-dev] ovs-ofctl mod-table commands supporting OF1.4 Eviction and Vacancy-Events

[Saloni Jain]

Hi Ben,

According Open vSwitch Manual:
"ovs-vswitchd can perform all configured bridging and switching locally, or  it can be configured to communicate with one or more external Open‐Flow controllers.  The switch is typically configured to connect  to  a "primary  controller"  that  takes  charge  of the bridge's flow table to implement a network policy.  In addition, the switch can be  configured to listen to connections from "service controllers".  Service controllers are typically used for occasional support and  maintenance,  e.g.  with ovs-ofctl."

So what I think that instead of "ovs-ofctl table-mod" to use an OFPMP_TABLE_DESC request to obtain the current configuration, then modify it according to the user's request, "ovs-vswitchd" should query and store the current table-configuration and modify it with user's request, as in this case both  "primary controller" and "service controller" will be taken into consideration.

If the query for the current configuration is sent from "ovs-ofctl", then only service controller will take the existing configuration into consideration and in that case table-mod message from other primary/open-flow controllers will overwrite/affect other properties that user didn't request. In other words, say for example there are 2 openflow controllers connected to switch, first controller through mod-table set Eviction for a table on switch and second controller sends the table-mod request for vacancy-events for the same table, in that case, the previously configured Eviction mechanism will get off and only vacancy events will be set for that table, which is not the desired action.

So I think it will be good that "ovs-vswitchd" should query and store the current table-configuration and modify it with controllers request
Please correct me if my understanding is wrong.

Thanks and Regards,
Saloni Jain
Tata Consultancy Services
Mailto: saloni.jain at tcs.com
Website: http://www.tcs.com
____________________________________________
Experience certainty.	IT Services
Business Solutions
Consulting
____________________________________________


-----Ben Pfaff <blp at nicira.com> wrote: -----
To: Saloni Jain <saloni.jain at tcs.com>
From: Ben Pfaff <blp at nicira.com>
Date: 07/16/2015 05:50AM
Cc: dev at openvswitch.org, Deepankar Gupta <deepankar.gupta at tcs.com>, Partha Datta <partha.datta at tcs.com>
Subject: Re: [ovs-dev] ovs-ofctl mod-table commands supporting OF1.4 Eviction and Vacancy-Events

On Tue, Jul 14, 2015 at 05:51:50PM +0530, Saloni Jain wrote:
> In addition to my previous response, please suggest if "vswitchd"
> should query and get the current stored table-configurartion
> using query_tables_desc() and then modify table-config properties
> according to user's request.

I don't understand the question.  Do you mean ovs-ofctl instead of
vswitchd?
=====-----=====-----=====
Notice: The information contained in this e-mail
message and/or attachments to it may contain 
confidential or privileged information. If you are 
not the intended recipient, any dissemination, use, 
review, distribution, printing or copying of the 
information contained in this e-mail message 
and/or attachments to it are strictly prohibited. If 
you have received this communication in error, 
please notify us by reply e-mail or telephone and 
immediately and permanently delete the message 
and any attachments. Thank you