T8030: VPP: Check support for changed driver too

Author: natali-rs1985

python/vyos/vpp/config_verify.py

@@ -22,7 +22,6 @@
 from vyos.base import Warning
 from vyos.utils.cpu import get_core_count as total_core_count, get_cpus
 
-from vyos.vpp.control_host import get_eth_driver
 from vyos.vpp.config_resource_checks import cpu as cpu_checks, memory as mem_checks
 from vyos.vpp.config_resource_checks.resource_defaults import default_resource_map
 from vyos.vpp.utils import human_memory_to_bytes, bytes_to_human_memory
@@ -122,7 +121,7 @@ def verify_vpp_tunnel_source_address(config: dict):
     )
 
 
-def verify_dev_driver(iface_name: str, driver_type: str) -> bool:
+def verify_dev_driver(driver_type: str, driver: str) -> bool:
     # Lists of drivers compatible with DPDK and XDP
     drivers_dpdk: list[str] = [
         'atlantic',
@@ -167,8 +166,6 @@ def verify_dev_driver(iface_name: str, driver_type: str) -> bool:
         'vmxnet3',
     ]
 
-    driver: str = get_eth_driver(iface_name)
-
     if driver_type == 'dpdk':
         if driver in drivers_dpdk:
             return True

src/conf_mode/vpp.py

@@ -346,6 +346,9 @@ def get_config(config=None):
                     conf, base_settings + ['interface', iface, 'driver']
                 )
 
+                if old_driver:
+                    config['settings']['interface'][iface]['driver_changed'] = {}
+
                 # Get current kernel module, required for extra verification and
                 # logic for VMBus interfaces
                 config['settings']['interface'][iface]['kernel_module'] = (
@@ -542,10 +545,14 @@ def verify(config):
     # ensure DPDK/XDP settings are properly configured
     for iface, iface_config in config['settings']['interface'].items():
         # check if selected driver is supported, but only for new interfaces
-        if iface not in config.get('effective', {}).get('settings', {}).get(
-            'interface', {}
+        # or if driver was changed
+        original_driver = config['persist_config'][iface]['original_driver']
+        if (
+            iface
+            not in config.get('effective', {}).get('settings', {}).get('interface', {})
+            or 'driver_changed' in iface_config
         ):
-            if not verify_dev_driver(iface, iface_config['driver']):
+            if not verify_dev_driver(iface_config['driver'], original_driver):
                 raise ConfigError(
                     f'Driver {iface_config["driver"]} is not compatible with interface {iface}!'
                 )