[ovs-dev] Openflow 1.4: Eviction mechanism implementation

[Ben Pfaff]

On Thu, Sep 11, 2014 at 05:34:34PM +0530, Saloni Jain wrote:
> 1. As per current implementation, "ovs-vsctl create table ... overflow-policy=evict" command, configures openvswitch database(conf.db) and sets table structure eviction fields and eviction groups.
> ?
> 2. As per our understanding, the implementation of eviction for importance as per openflow specification 1.4, should be in parallel with existing functionality, i.e. if eviction for importance is set through mod-table command and importance parameter is given by the user,then we must create the eviction groups(eviction_group_add_rule) and at the time of eviction, obtain the value on basis of importance from this group. 
> 
> 3. This approach requires table->eviction_field which is set only when create table command with overflow-policy=evict is given. 
> 
> 4. mod-table command for setting the eviction parameter as importance will only set the table config parameter as "importance" and will not set the table->eviction fields.
> 
> 5. So as per our understanding this should be mandatory to first enable eviction on the complete table using create table ... overflow-policy=evict and then change the mode of eviction as importance using mod-table command.

I would enable eviction if it is configured through the database or
through the OpenFlow connection.