vpp: T9018: Auto-enable promiscuous mode for interfaces with VLANs

VPP drops VLAN-tagged frames unless the parent interface has promiscuous
mode enabled, causing VLAN sub-interfaces to lose connectivity.
Automatically enable promiscuous mode on VPP interfaces that have VLAN
sub-interfaces (vif/vif-s) configured.

1 files changed, 36 insertions, 0 deletions

diff --git a/smoketest/scripts/cli/test_vpp.py b/smoketest/scripts/cli/test_vpp.py
index 7813dfdf5..e937aaa3b 100755
--- a/smoketest/scripts/cli/test_vpp.py
+++ b/smoketest/scripts/cli/test_vpp.py
@@ -1474,6 +1474,9 @@ class TestVPP(VyOSUnitTestSHIM.TestCase):
         # Ensure that VPP process is active
         self.assertTrue(process_named_running(PROCESS_NAME))
 
+        # Cleanup
+        self.cli_delete(['interfaces', 'ethernet', interface, 'vif', vlan])
+
     def test_23_1_vpp_acl_subinterface(self):
         base_acl = base_path + ['acl', 'ip']
         vlan = '200'
@@ -1514,6 +1517,9 @@ class TestVPP(VyOSUnitTestSHIM.TestCase):
             list(acl_interfaces[0].acls)[: acl_interfaces[0].count], [acl_index]
         )
 
+        # Cleanup
+        self.cli_delete(['interfaces', 'ethernet', interface, 'vif', vlan])
+
     def test_23_2_vpp_acl_bond_with_vif(self):
         base_acl = base_path + ['acl', 'ip']
         base_bond = interfaces_path + ['bonding']
@@ -1665,6 +1671,36 @@ class TestVPP(VyOSUnitTestSHIM.TestCase):
         self.cli_delete(['vrf', 'name', mgmt_vrf])
         self.cli_commit()
 
+    def test_25_vpp_promisc_vlan(self):
+        # T9018: promiscuous mode must be enabled automatically when VLANs
+        # are configured on a VPP interface and disabled when removed.
+        vlan = '100'
+        address = '192.168.10.1/24'
+
+        self.cli_commit()
+
+        # Verify promisc is off initially
+        _, out = rc_cmd(f'sudo vppctl show hardware-interfaces {interface}')
+        self.assertNotRegex(out, r'flags:.*\bpromisc\b')
+
+        # Add VLAN sub-interface
+        self.cli_set(
+            ['interfaces', 'ethernet', interface, 'vif', vlan, 'address', address]
+        )
+        self.cli_commit()
+
+        # Verify promisc is enabled
+        _, out = rc_cmd(f'sudo vppctl show hardware-interfaces {interface}')
+        self.assertRegex(out, r'flags:.*\bpromisc\b')
+
+        # Remove VLAN sub-interface
+        self.cli_delete(['interfaces', 'ethernet', interface, 'vif'])
+        self.cli_commit()
+
+        # Verify promisc is disabled
+        _, out = rc_cmd(f'sudo vppctl show hardware-interfaces {interface}')
+        self.assertNotRegex(out, r'flags:.*\bpromisc\b')
+
 
 if __name__ == '__main__':
     unittest.main(verbosity=2, failfast=VyOSUnitTestSHIM.TestCase.debug_on())