Configure the numvfs for SRIOV interfaces

This patch shall create VFs via the PCI SYS interface.
Default value : $::os_service_default
Sample Format : ['eth0:4','eth2:128']
For values as in sample format, the sriov_numvfs config files
for eth0 and eth2 will have the values 4 and 128 respectively

Change-Id: I2c1fce461d4602cd9f7de44b34e94920d1a581a6
Implements: blueprint tripleo-sriov
Signed-off-by: karthik s <ksundara@redhat.com>

lib/puppet/provider/neutron_agent_sriov_numvfs/sriov_numvfs.rb

@@ -0,0 +1,58 @@
+Puppet::Type.type(:neutron_agent_sriov_numvfs).provide(:sriov_numvfs) do
+  desc <<-EOT
+    The file /sys/class/net/<sriov_interface_name>/device/sriov_numvfs will be
+    present when a physical PCIe device supports SR-IOV. A number written to
+    this file will enable the specified number of VFs. This provider shall read
+    the file and ensure that the value is zero, before writing the number of
+    VFs that should be enabled. If the VFs needs to be disabled then we shall
+    write a zero to this file.
+  EOT
+
+  def create
+    if File.file?(sriov_numvfs_path)
+      _set_numvfs
+    else
+      fail("#{sriov_numvfs_path} doesn't exist. Check if #{sriov_get_interface} is a valid network interface supporting SR-IOV")
+    end
+  end
+
+  def destroy
+    if File.file?(sriov_numvfs_path)
+      File.write(sriov_numvfs_path,"0")
+    end
+  end
+
+  def exists?
+    if File.file?(sriov_numvfs_path)
+      cur_value = File.read(sriov_numvfs_path)
+      if cur_value.to_i == sriov_numvfs_value
+        return true
+      end
+    end
+    return false
+  end
+
+  def _set_numvfs
+    # During an update, the content of file sriov_numvfs_path has to be set
+    # to 0 (ZERO), before writing the actual value
+    cur_value = File.read(sriov_numvfs_path)
+    if cur_value != 0
+      File.write(sriov_numvfs_path,"0")
+    end
+    File.write(sriov_numvfs_path,sriov_numvfs_value)
+  end
+
+  def sriov_numvfs_path
+    "/sys/class/net/#{sriov_get_interface}/device/sriov_numvfs"
+  end
+
+  def sriov_get_interface
+    resource[:name].split(':', 2).first
+  end
+
+  def sriov_numvfs_value
+    resource[:name].split(':', 2).last.to_i
+  end
+
+end
+

lib/puppet/type/neutron_agent_sriov_numvfs.rb

@@ -0,0 +1,11 @@
+Puppet::Type.newtype(:neutron_agent_sriov_numvfs) do
+
+  ensurable
+
+  newparam(:name) do
+    desc "sriov_numvfs conf as <physical_network>:<number_of_vfs> format"
+    newvalues(/^[a-z0-9-_]+:[0-9]+$/)
+  end
+
+end
+

manifests/agents/ml2/sriov.pp

@@ -62,6 +62,13 @@
 #   in the sriov config.
 #   Defaults to false.
 #
+# [*number_of_vfs*]
+#   (optional) List of <physical_network>:<number_of_vfs> specifying the number
+#   VFs to be exposed per physical interface.
+#   For example, to configure two inteface with number of VFs, specify
+#   it as "eth1:4,eth2:10"
+#   Defaults to $::os_service_default.
+#
 class neutron::agents::ml2::sriov (
   $package_ensure             = 'present',
   $enabled                    = true,
@@ -71,6 +78,7 @@ class neutron::agents::ml2::sriov (
   $exclude_devices            = $::os_service_default,
   $extensions                 = $::os_service_default,
   $purge_config               = false,
+  $number_of_vfs              = $::os_service_default,
 ) {
 
   include ::neutron::deps
@@ -87,6 +95,10 @@ class neutron::agents::ml2::sriov (
     'agent/extensions':                   value => join(any2array($extensions), ',');
   }
 
+  if !is_service_default($number_of_vfs) and !empty($number_of_vfs) {
+    neutron_agent_sriov_numvfs { $number_of_vfs: ensure => present }
+  }
+
   package { 'neutron-sriov-nic-agent':
     ensure => $package_ensure,
     name   => $::neutron::params::sriov_nic_agent_package,

releasenotes/notes/sriov-numvfs-configuration-3ae862cf09a9a813.yaml

@@ -0,0 +1,3 @@
+---
+features:
+  - Added a provider to configure VFs for SR-IOV interface

spec/classes/neutron_agents_ml2_sriov_spec.rb

@@ -46,7 +46,9 @@ describe 'neutron::agents::ml2::sriov' do
       is_expected.to contain_neutron_sriov_agent_config('agent/extensions').with_value(['<SERVICE DEFAULT>'])
     end
 
-
+    it 'does not configure numvfs by default' do
+      is_expected.not_to contain_neutron_agents_ml2_sriov_numvfs('<SERVICE DEFAULT>')
+    end
 
     it 'installs neutron sriov-nic agent package' do
       is_expected.to contain_package('neutron-sriov-nic-agent').with(
@@ -69,6 +71,27 @@ describe 'neutron::agents::ml2::sriov' do
       is_expected.to contain_service('neutron-sriov-nic-agent-service').that_notifies('Anchor[neutron::service::end]')
     end
 
+    context 'when number_of_vfs is empty' do
+      before :each do
+        params.merge!(:number_of_vfs => "")
+      end
+
+      it 'does not configure numvfs ' do
+        is_expected.not_to contain_neutron_agents_ml2_sriov_numvfs('<SERVICE DEFAULT>')
+      end
+    end
+
+    context 'when number_of_vfs is configured' do
+      before :each do
+        params.merge!(:number_of_vfs => ['eth0:4','eth1:5'])
+      end
+
+      it 'configures numvfs' do
+        is_expected.to contain_neutron_agent_sriov_numvfs('eth0:4').with( :ensure => 'present' )
+        is_expected.to contain_neutron_agent_sriov_numvfs('eth1:5').with( :ensure => 'present')
+      end
+    end
+
     context 'with manage_service as false' do
       before :each do
         params.merge!(:manage_service => false)

spec/unit/provider/neutron_agent_sriov_numvfs/sriov_numvfs_spec.rb

@@ -0,0 +1,36 @@
+require 'puppet'
+require 'spec_helper'
+require 'puppet/provider/neutron_agent_sriov_numvfs/sriov_numvfs'
+
+provider_class = Puppet::Type.type(:neutron_agent_sriov_numvfs).
+  provider(:sriov_numvfs)
+
+describe provider_class do
+
+  let :numvfs_conf do
+    {
+      :name            => 'eth0:10',
+      :ensure          => 'present',
+    }
+  end
+
+  describe 'when setting the attributes' do
+    let :resource do
+      Puppet::Type::Neutron_agent_sriov_numvfs.new(numvfs_conf)
+    end
+
+    let :provider do
+      provider_class.new(resource)
+    end
+
+    it 'should return the correct interface name' do
+      expect(provider.sriov_get_interface).to eql('eth0')
+    end
+
+    it 'should return the correct numvfs value' do
+      expect(provider.sriov_numvfs_value).to eql(10)
+    end
+
+  end
+
+end

spec/unit/type/neutron_agent_sriov_numvfs_spec.rb

@@ -0,0 +1,47 @@
+require 'puppet'
+require 'puppet/type/neutron_agent_sriov_numvfs'
+
+describe 'Puppet::Type.type(:neutron_agent_sriov_numvfs)' do
+  it 'should allow name to be passed' do
+    expect{Puppet::Type.type(:neutron_agent_sriov_numvfs).new(
+      :name   => 'eth0:10',
+      :ensure => 'present'
+    )}.not_to raise_error
+  end
+  it 'should allow name to be passed with -' do
+    expect{Puppet::Type.type(:neutron_agent_sriov_numvfs).new(
+      :name   => 'eth-0:10',
+      :ensure => 'present'
+    )}.not_to raise_error
+  end
+  it 'should allow name to be passed with _' do
+    expect{Puppet::Type.type(:neutron_agent_sriov_numvfs).new(
+      :name   => 'eth_0:10',
+      :ensure => 'present'
+    )}.not_to raise_error
+  end
+  it 'should throw error for invalid format' do
+    expect{Puppet::Type.type(:neutron_agent_sriov_numvfs).new(
+      :name   => 'eth0',
+      :ensure => 'present'
+    )}.to raise_error(Puppet::ResourceError)
+  end
+  it 'should throw error for invalid format without interface name' do
+    expect{Puppet::Type.type(:neutron_agent_sriov_numvfs).new(
+      :name   => ':9',
+      :ensure => 'present'
+    )}.to raise_error(Puppet::ResourceError)
+  end
+  it 'should throw error for invalid format for numvfs' do
+    expect{Puppet::Type.type(:neutron_agent_sriov_numvfs).new(
+      :name   => 'eth8:none',
+      :ensure => 'present'
+    )}.to raise_error(Puppet::ResourceError)
+  end
+  it 'should throw error for invalid format without numvfs' do
+    expect{Puppet::Type.type(:neutron_agent_sriov_numvfs).new(
+      :name   => 'eth0:',
+      :ensure => 'present'
+    )}.to raise_error(Puppet::ResourceError)
+  end
+end