OvS 2.7 support - dpdk-devargs needs to provided for DPDK devices

The pci address of the DPDK NIC needs to be specified as dpdk-devargs
when adding the DPDK port. This is required for using DPDK with
OvS 2.7

Change-Id: I4975130961199ee04dd002ec987081299e3ddd4a
Closes-Bug: #1702457
Signed-off-by: Karthik S <ksundara@redhat.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/os_net_config/utils.py b/os_net_config/utils.py
index b7a54bf..27e888d 100644
--- a/os_net_config/utils.py
+++ b/os_net_config/utils.py
@@ -238,6 +238,14 @@ def bind_dpdk_interfaces(ifname, driver, noop):
             except processutils.ProcessExecutionError:
                 msg = "Failed to bind interface %s with dpdk" % ifname
                 raise OvsDpdkBindException(msg)
+        else:
+            # Check if the pci address is already fetched and stored.
+            # If the pci address could not be fetched from dpdk_mapping.yaml
+            # raise OvsDpdkBindException, since the interface is neither
+            # available nor bound with dpdk.
+            if not get_stored_pci_address(ifname, noop):
+                msg = "Interface %s cannot be found" % ifname
+                raise OvsDpdkBindException(msg)
     else:
         logger.info('Interface %(name)s bound to DPDK driver %(driver)s '
                     'using driverctl command' %
@@ -264,6 +272,17 @@ def get_pci_address(ifname, noop):
                     'ethtool' % ifname)
 
 
+def get_stored_pci_address(ifname, noop):
+    if not noop:
+        dpdk_map = _get_dpdk_map()
+        for dpdk_nic in dpdk_map:
+            if dpdk_nic['name'] == ifname:
+                return dpdk_nic['pci_address']
+    else:
+        logger.info('Fetch the PCI address of the interface %s using '
+                    'ethtool' % ifname)
+
+
 # Once the interface is bound to a DPDK driver, all the references to the
 # interface including '/sys' and '/proc', will be removed. And there is no
 # way to identify the nic name after it is bound. So, the DPDK bound nic info