<div dir="ltr">Reviewed-by: Andrew Bailey <<a href="mailto:abailey@iol.unh.edu">abailey@iol.unh.edu</a>></div> <div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, Dec 17, 2025 at 2:52 PM Dean Marx <<a href="mailto:dmarx@iol.unh.edu">dmarx@iol.unh.edu</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Add an additional test case to the virtio_fwd suite which tests packet forwarding across a physical-virtual-virtual-physical topology. Signed-off-by: Dean Marx <<a href="mailto:dmarx@iol.unh.edu" target="_blank">dmarx@iol.unh.edu</a>> --- dts/tests/TestSuite_virtio_fwd.py | 99 +++++++++++++++++++++++++++++++ 1 file changed, 99 insertions(+) diff --git a/dts/tests/TestSuite_virtio_fwd.py b/dts/tests/TestSuite_virtio_fwd.py index bdecdb76fd..e78da7da05 100644 --- a/dts/tests/TestSuite_virtio_fwd.py +++ b/dts/tests/TestSuite_virtio_fwd.py @@ -6,6 +6,8 @@ Verify vhost/virtio pvp and fully virtual functionalities. """ +from pathlib import PurePath + from scapy.layers.inet import IP from scapy.layers.l2 import Ether @@ -195,3 +197,100 @@ def pvp_loop(self) -> None: f"PVP loop forwarding verification failed: vhost interface RX={rx_packets}," f" TX={tx_packets} (expected ≥100 each).", ) + + @requires(topology_type=LinkTopology.ONE_LINK) + @func_test + def pvvp_loop(self) -> None: + """Test vhost/virtio physical-virtual-virtual-physical topology. + + Steps: + * Create directory for vhost-user socket files. + * Launch primary testpmd session with physical NICs and two virtio-user + vdevs connected to vhost-user sockets in server mode. + * Launch first vhost testpmd session with vhost vdev connected to the + first vhost-user socket as client. + * Launch second vhost testpmd session with vhost vdev connected to the + second vhost-user socket as client. + * Configure port forwarding order in primary session to chain physical + port through both virtual devices. + * Start packet forwarding on all three testpmd sessions. + * Send 100 packets to the physical interface from external tester. + + Verify: + * Both vhost sessions receive/forward 100+ packets each. + """ + self.sut_node = self._ctx.sut_node + if not isinstance(self.sut_node.main_session, LinuxSession): + verify(False, "Must be running on a Linux environment.") + self.sut_node.main_session.remove_remote_dir("/tmp/vhost-sockets") + self.sut_node.main_session.create_directory(PurePath("/tmp/vhost-sockets")) + with ( + TestPmd( + prefix="vhost1", + vdevs=[ + VirtualDevice("net_vhost0,iface=/tmp/vhost-sockets/vhost0,queues=1,client=1") + ], + no_pci=True, + ) as vhost1, + TestPmd( + prefix="vhost2", + vdevs=[ + VirtualDevice("net_vhost1,iface=/tmp/vhost-sockets/vhost1,queues=1,client=1") + ], + no_pci=True, + ) as vhost2, + TestPmd( + prefix="virtio", + vdevs=[ + VirtualDevice( + "net_virtio_user0,mac=00:00:00:00:00:01,path=/tmp/vhost-sockets/vhost0,queues=1,queue_size=1024,server=1" + ), + VirtualDevice( + "net_virtio_user1,mac=00:00:00:00:00:02,path=/tmp/vhost-sockets/vhost1,queues=1,queue_size=1024,server=1" + ), + ], + port_topology=PortTopology.chained, + ) as virtio, + ): + virtio.set_forward_mode(SimpleForwardingModes.mac) + vhost1.set_forward_mode(SimpleForwardingModes.mac) + vhost2.set_forward_mode(SimpleForwardingModes.mac) + + portlist_order = [0, 2, 3, 1] if len(virtio.ports) == 4 else [0, 2, 1] + virtio.set_portlist(order=portlist_order) + + virtio.start() + vhost1.start() + vhost2.start() + + packet = Ether() / IP() + packets = [packet] * 100 + send_packets_and_capture(packets) + + vhost1.stop() + vhost2.stop() + virtio.stop() + + vhost1_forwarding_stats, vhost1_raw_output = vhost1.show_port_stats_all() + vhost2_forwarding_stats, vhost2_raw_output = vhost2.show_port_stats_all() + + rx_packets_vhost1 = vhost1_forwarding_stats[0].rx_packets + tx_packets_vhost1 = vhost1_forwarding_stats[0].tx_packets + + rx_packets_vhost2 = vhost2_forwarding_stats[0].rx_packets + tx_packets_vhost2 = vhost2_forwarding_stats[0].tx_packets + + log(f"Vhost1 forwarding statistics:\n{vhost1_raw_output}") + log(f"Vhost2 forwarding statistics:\n{vhost2_raw_output}") + + verify( + rx_packets_vhost1 >= 100 and tx_packets_vhost1 >= 100, + f"PVP loop forwarding verification failed: vhost1 interface RX={rx_packets_vhost1}," + f" TX={tx_packets_vhost1} (expected ≥100 each).", + ) + + verify( + rx_packets_vhost2 >= 100 and tx_packets_vhost2 >= 100, + f"PVP loop forwarding verification failed: vhost2 interface RX={rx_packets_vhost2}," + f" TX={tx_packets_vhost2} (expected ≥100 each).", + ) -- 2.51.0 </blockquote></div>