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
The SR-IOV numvfs configuration shall be persisted in /sbin/ifup-local
so that, during the bootup of the compute nodes, the numvfs
configuration will be restored.

Change-Id: I7450b904475bdf46498d9af633416b3eba12f761
Implements: blueprint tripleo-sriov
Signed-off-by: karthik s <ksundara@redhat.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/lib/puppet/provider/sriov_vf_config/numvfs.rb b/lib/puppet/provider/sriov_vf_config/numvfs.rb
new file mode 100644
index 0000000..cfa663c
--- /dev/null
+++ b/lib/puppet/provider/sriov_vf_config/numvfs.rb
@@ -0,0 +1,57 @@
+Puppet::Type.type(:sriov_vf_config).provide(: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