Open Stack

Dear all,

I'm following the OpenStack guide for
 the implementation of SR-IOV mechanism driver.
I'm planning to incorporate this driver to
 my current OpenStack deployment (Queens).

Config SR-IOV Guide:
https://docs.openstack.org/neutron/queens/admin/config-sriov.html

At point 2, section "Configure neutron-server (Controller)"
 they said that I have to add the 'plugin.ini' file
  as a parameter to the neutron-server service.
To do this they require to
 <<edit the appropriate initialization script to configure the
  neutron-server service to load the plugin configuration file>>:
--config-file /etc/neutron/neutron.conf
--config-file /etc/neutron/plugin.ini

I'd like to know a few things:

(1) Which plugin.ini file are talking about?
(2) How to set up the neutron-server initialization script
 to add the plugin.ini file?
  I understand that this varies between OS distro
   (I'm currently using Ubuntu 16.04 LTS server)

Here are some things I tried...

I got the following results executing this command:

systemctl status neutron-server.service
● neutron-server.service - OpenStack Neutron Server
   Loaded: loaded (/lib/systemd/system/neutron-server.service;
    enabled; vendor preset: enabled)
   Active: active (running) since Tue 2020-12-29 18:13:50 -05
 Main PID: 38590 (neutron-server)
    Tasks: 44
   Memory: 738.8M
      CPU: 29.322s
   CGroup: /system.slice/neutron-server.service
           ├─38590 /usr/bin/python2 /usr/bin/neutron-server
            --config-file=/etc/neutron/neutron.conf
             --config-file=/etc/neutron/plugins/ml2/ml2_conf.ini
              --log-file=/var/log/neutron/neutron-server.log
...

I see 2 things:

(i) When neutron-server is exectured,
 the following parameters are passed:
--config-file=/etc/neutron/neutron.conf
--config-file=/etc/neutron/plugins/ml2/ml2_conf.ini
--log-file=/var/log/neutron/neutron-server.log

(ii) The file '/lib/systemd/system/neutron-server.service'
 is loaded and it has the following content:
...
ExecStart=/etc/init.d/neutron-server systemd-start
...

This indicates me that it's executing
 '/etc/init.d/neutron-server' script.
So I suppose this is the file indicated to add the parameters
 of the SR-IOV OpenStack documentation,
  but I have no idea where to put them.

For Red-Hat distros I found this documentation
 with the following configuration:
https://access.redhat.com/documentation/en-us/
red_hat_enterprise_linux_openstack_platform/7/html/networking_guide
/sr-iov-support-for-virtual-networking

vi /usr/lib/systemd/system/neutron-server.service
...
ExecStart=/usr/bin/neutron-server
 --config-file /usr/share/neutron/neutron-dist.conf
  --config-file /etc/neutron/neutron.conf
   --config-file /etc/neutron/plugin.ini
    --config-file /etc/neutron/plugins/ml2/ml2_conf_sriov.ini
     --log-file /var/log/neutron/server.log

Thanks in advance,
Gabriel Gamero