T7890: VPP fix verify_dev_driver

The verify_dev_driver must return bool value, but it a device
does not have PCI address (for example veth interface)
it returns Traceback

Fix this

2 files changed, 10 insertions, 7 deletions

diff --git a/python/vyos/vpp/control_host.py b/python/vyos/vpp/control_host.py
index 6a6b9d72f..db1a492c9 100644
--- a/python/vyos/vpp/control_host.py
+++ b/python/vyos/vpp/control_host.py
@@ -23,6 +23,7 @@ from time import sleep
 
 from pyroute2 import IPRoute
 
+from vyos.ethtool import Ethtool
 from vyos.vpp.utils import EthtoolGDrvinfo
 
 
@@ -266,14 +267,16 @@ def get_eth_driver(iface: str) -> str:
     Returns:
         str: kernel module name
     """
-    iface_driver: str = ''
     driver_dir = Path(f'/sys/class/net/{iface}/device/driver/module')
-    if not driver_dir.exists():
-        # raise error if device was not found
-        raise FileNotFoundError(f'PCI device {iface} not found in ethernet interfaces')
+    # Try to detect via sysfs (works for PCI devices)
+    if driver_dir.exists():
+        return driver_dir.resolve().name
 
-    iface_driver: str = driver_dir.resolve().name
-    return iface_driver
+    # Fallback: use ethtool (works for veth, tun, etc.)
+    try:
+        return Ethtool(iface).get_driver_name()
+    except Exception as error:
+        raise Exception(f'Could not determine driver for "{iface}": {error}') from error
 
 
 def unsafe_noiommu_mode(status: bool) -> None:
diff --git a/src/conf_mode/vpp.py b/src/conf_mode/vpp.py
index 81502c0b4..d3bf86ada 100755
--- a/src/conf_mode/vpp.py
+++ b/src/conf_mode/vpp.py
@@ -604,7 +604,7 @@ def initialize_interface(iface, driver, iface_config) -> None:
     try:
         if control_host.get_eth_driver(f'defunct_{iface}') == 'mlx5_core':
             control_host.rename_iface(f'defunct_{iface}', iface)
-    except FileNotFoundError:
+    except Exception:
         pass
 
     # Replace a driver with original for VMBus interfaces and rename it