vpp: T8202: Remove XDP driver and options from CLI and config

- Migration script removes 'driver' and 'xdp-options' nodes.
- XDP logic is commented out in config verification and CLI tests, preserving code for future use.
- The rest of XDP-related code remains untouched

3 files changed, 71 insertions, 38 deletions

diff --git a/src/conf_mode/interfaces_ethernet.py b/src/conf_mode/interfaces_ethernet.py
index ffb59c89e..f01de48a1 100755
--- a/src/conf_mode/interfaces_ethernet.py
+++ b/src/conf_mode/interfaces_ethernet.py
@@ -448,7 +448,7 @@ def apply(ethernet):
         call_dependents()
 
     vpp_iface_config = dict_search(f'vpp.settings.interface.{ifname}', ethernet)
-    if vpp_iface_config and is_systemd_service_running('vpp.service'):
+    if vpp_iface_config is not None and is_systemd_service_running('vpp.service'):
         vpp_api = VPPControl()
 
         # Enable ip4-dhcp-client-detect feature for DHCP-configured interfaces.
@@ -460,14 +460,13 @@ def apply(ethernet):
 
         # If the interface is managed by the VPP DPDK driver, synchronize runtime
         # parameters between Linux and the corresponding VPP LCP interface
-        if vpp_iface_config.get('driver') == 'dpdk':
-            # Find LCP pair
-            lcp_pair = vpp_api.lcp_pair_find(vpp_name_hw=ifname)
+        # Find LCP pair
+        lcp_pair = vpp_api.lcp_pair_find(vpp_name_hw=ifname)
+        # Sync MTU to VPP LCP pair interface
+        if lcp_pair:
             lcp_name = lcp_pair.get('vpp_name_kernel')
-            # Sync MTU to VPP LCP pair interface
-            if lcp_name:
-                mtu = e.get_mtu()
-                vpp_api.set_iface_mtu(lcp_name, mtu)
+            mtu = e.get_mtu()
+            vpp_api.set_iface_mtu(lcp_name, mtu)
 
     return None
 
diff --git a/src/conf_mode/vpp.py b/src/conf_mode/vpp.py
index 274cd1da5..79c46bde8 100755
--- a/src/conf_mode/vpp.py
+++ b/src/conf_mode/vpp.py
@@ -30,7 +30,7 @@ from vyos import airbag
 from vyos.base import Warning
 from vyos.config import Config, config_dict_merge
 from vyos.configdep import set_dependents, call_dependents
-from vyos.configdict import node_changed, leaf_node_changed
+from vyos.configdict import node_changed
 from vyos.ifconfig import Section
 from vyos.logger import getLogger
 from vyos.template import render
@@ -256,9 +256,7 @@ def get_config(config=None):
         for removed_iface in tmp:
             to_append = {
                 'iface_name': removed_iface,
-                'driver': effective_config['settings']['interface'][removed_iface][
-                    'driver'
-                ],
+                'driver': 'dpdk',
             }
             removed_ifaces.append(to_append)
             # add an interface to a list of interfaces that need
@@ -296,12 +294,15 @@ def get_config(config=None):
     # dictionary retrieved.
     default_values = conf.get_config_defaults(**config.kwargs, recursive=True)
 
-    # delete driver-incompatible defaults
-    for iface, iface_config in config.get('settings', {}).get('interface', {}).items():
-        if iface_config.get('driver') == 'dpdk':
-            del default_values['settings']['interface'][iface]['xdp_options']
-        elif iface_config.get('driver') == 'xdp':
-            del default_values['settings']['interface'][iface]['dpdk_options']
+    # Since XDP is no longer configurable via the CLI (T8202),
+    # this code is kept commented out to simplify reintroducing XDP in the future.
+    #
+    # # delete driver-incompatible defaults
+    # for iface, iface_config in config.get('settings', {}).get('interface', {}).items():
+    #     if iface_config.get('driver') == 'dpdk':
+    #         del default_values['settings']['interface'][iface]['xdp_options']
+    #     elif iface_config.get('driver') == 'xdp':
+    #         del default_values['settings']['interface'][iface]['dpdk_options']
 
     config = config_dict_merge(default_values, config)
 
@@ -317,6 +318,8 @@ def get_config(config=None):
         effective_config = config_dict_merge(default_values_effective, effective_config)
         # Buffer normalization (auto → computed)
         _normalize_buffers(effective_config)
+        for iface_config in effective_config['settings']['interface'].values():
+            iface_config['driver'] = 'dpdk'
         config['effective'] = effective_config
 
     # Save important info about all interfaces that cannot be retrieved later
@@ -336,18 +339,14 @@ def get_config(config=None):
     if 'settings' in config:
         if 'interface' in config['settings']:
             for iface, iface_config in config['settings']['interface'].items():
-                # Driver must be configured to continue
-                if 'driver' not in iface_config:
-                    raise ConfigError(
-                        f'"driver" must be configured for {iface} interface!'
-                    )
+                iface_config['driver'] = 'dpdk'
 
-                old_driver = leaf_node_changed(
-                    conf, base_settings + ['interface', iface, 'driver']
-                )
-
-                if old_driver:
-                    config['settings']['interface'][iface]['driver_changed'] = {}
+                # old_driver = leaf_node_changed(
+                #     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
@@ -359,13 +358,13 @@ def get_config(config=None):
                 iface_filter_eth(conf, iface)
                 set_dependents('ethernet', conf, iface)
                 # Interfaces with changed driver should be removed/readded
-                if old_driver and old_driver[0] == 'dpdk':
-                    removed_ifaces.append(
-                        {
-                            'iface_name': iface,
-                            'driver': 'dpdk',
-                        }
-                    )
+                # if old_driver and old_driver[0] == 'dpdk':
+                #     removed_ifaces.append(
+                #         {
+                #             'iface_name': iface,
+                #             'driver': 'dpdk',
+                #         }
+                #     )
 
                 # Get PCI address or device ID
                 if iface_config['driver'] == 'dpdk':
@@ -380,8 +379,8 @@ def get_config(config=None):
                     else:
                         try:
                             iface_to_search = iface
-                            if old_driver and old_driver[0] == 'xdp':
-                                iface_to_search = f'defunct_{iface}'
+                            # if old_driver and old_driver[0] == 'xdp':
+                            #     iface_to_search = f'defunct_{iface}'
                             iface_config['dpdk_options']['dev_id'] = (
                                 control_host.get_dev_id(iface_to_search)
                             )
diff --git a/src/migration-scripts/vpp/4-to-5 b/src/migration-scripts/vpp/4-to-5
new file mode 100644
index 000000000..4eaedc9a1
--- /dev/null
+++ b/src/migration-scripts/vpp/4-to-5
@@ -0,0 +1,35 @@
+# Copyright VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+# Delete node 'driver' and 'xdp-options' from CLI (T8202)
+
+
+from vyos.configtree import ConfigTree
+
+base = ['vpp', 'settings', 'interface']
+
+def migrate(config: ConfigTree) -> None:
+    if not config.exists(base):
+        # Nothing to do
+        return
+
+    for iface_name in config.list_nodes(base):
+        base_driver = base + [iface_name, 'driver']
+        base_xdp_options = base + [iface_name, 'xdp-options']
+        if config.exists(base_driver):
+            # Delete 'driver' node
+            config.delete(base_driver)
+        if config.exists(base_xdp_options):
+            config.delete(base_xdp_options)