Skip representator port(s) while discovering active NICs

When switchdev is enabled (in mellanox nics), there will
be additional representator interfaces created. They have
to be ignored when checking if NIC is real or virtual

Change-Id: I16457778542243d6046fc145f369756e3424a503

os_net_config/tests/test_utils.py

@@ -838,6 +838,11 @@ class TestUtils(base.TestCase):
         tmpdir = tempfile.mkdtemp()
         self.stub_out('os_net_config.common.SYS_CLASS_NET', tmpdir)
 
+        def test_get_pci_addr(interface_name, noop):
+            return "0000:18:00.2"
+        self.stub_out('os_net_config.utils.get_pci_address',
+                      test_get_pci_addr)
+
         # SR-IOV PF = ens802f0
         # SR-IOV VF = enp129s2
         for nic in ['ens802f0', 'enp129s2']:

os_net_config/utils.py

@@ -105,6 +105,19 @@ def is_real_nic(interface_name):
         return False
 
 
+def is_representor_port_by_name(interface_name):
+
+    is_representor_port = False
+
+    bus_info = get_pci_address(interface_name, noop=False)
+    if not bus_info:
+        is_representor_port = True
+    logger.debug("nics %s pci_addr is: %s" %
+                 (interface_name, bus_info))
+
+    return is_representor_port
+
+
 def _is_available_nic(interface_name, check_active=True):
     try:
         if interface_name == 'lo':
@@ -128,6 +141,12 @@ def _is_available_nic(interface_name, check_active=True):
         if common.is_vf_by_name(interface_name):
             return False
 
+        # If switchdev(offload) is enabled in a PF interface, there
+        # will be additional representator ports. It has to be ignored.
+        # Representator INTF will not have any pci_addr set
+        if is_representor_port_by_name(interface_name):
+            return False
+
         # nic is available
         return True