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add case for vm transfer packet to remote host by udp
 xxxx-300100:[virtual network][virtual-nic-device]The local VM can transfer length 1473-1480 packets to remote host through UDP Signed-off-by: nanli <[email protected]>
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‎libvirt/tests/cfg/virtual_network/migrate/udp_transfer_during_migration.cfg‎

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- virtual_network.migrate.udp_transfer_during_migration:
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type = udp_transfer_during_migration
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take_regular_screendumps = "no"
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start_vm = "yes"
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status_error = "no"
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# Remote host configuration (required)
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remote_host =
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remote_user = "root"
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remote_passwd =
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# Guest OS configuration
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guest_os_type = "linux"
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# Network configuration
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udp_packet_size = 1473
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netperf_timeout = 120
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# Test variants
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variants:
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- linux_guest:
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guest_os_type = "linux"
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only Linux
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- windows_guest:
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guest_os_type = "windows"
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only Windows
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variants:
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- with_migration:
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# Migration specific parameters would go here
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# For basic UDP transfer test, migration is optional
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do_migration = "yes"
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- without_migration:
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# Test UDP transfer without migration for baseline
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do_migration = "no"

‎libvirt/tests/src/virtual_network/migrate/udp_transfer_during_migration.py‎

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import os
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import re
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import logging as log
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from avocado.utils import process
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from virttest import virsh
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from virttest import utils_misc
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from virttest import utils_net
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from virttest import remote
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from virttest.utils_test import libvirt
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from virttest.libvirt_xml import vm_xml
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from virttest.staging import utils_memory
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from provider.migration import base_steps
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# Using as lower capital is not the best way to do, but this is just a
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# workaround to avoid changing the entire file.
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logging = log.getLogger('avocado.' + __name__)
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def run(test, params, env):
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"""
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Test UDP packet transfer from VM to remote host during migration.
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1. Setup VM and remote host environment
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2. Install and configure netperf on remote host and VM
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3. Start packet capture on remote host
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4. Run UDP transfer test from VM to remote host
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5. Verify packets are captured correctly
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6. Clean up environment
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"""
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def disable_firewall(session, guest_os_type="linux"):
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"""Disable firewall on the target system."""
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if guest_os_type == "linux":
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cmd = "systemctl stop firewalld"
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status = session.cmd_status(cmd)
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if status == 0:
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logging.info("Firewall disabled successfully")
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else:
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logging.warning("Failed to disable firewall or already disabled")
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else:
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# Windows firewall
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cmd = 'netsh firewall set opmode mode=disable'
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output = session.cmd_output(cmd)
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logging.info("Windows firewall disabled: %s", output)
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def install_netperf(session, guest_os_type="linux"):
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"""Install netperf on the target system."""
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if guest_os_type == "linux":
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# Check if netperf is already installed
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status = session.cmd_status("which netperf")
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if status == 0:
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logging.info("netperf already installed")
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return
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# Install netperf
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install_cmd = ("yum install -y netperf || "
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"apt-get update && apt-get install -y netperf")
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session.cmd(install_cmd, timeout=300)
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# Verify installation
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status = session.cmd_status("which netperf")
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if status != 0:
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test.fail("Failed to install netperf")
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else:
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# For Windows, we would need to transfer netperf.exe
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# This is simplified for the basic structure
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logging.info("Windows netperf setup would be handled here")
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def start_netserver(session):
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"""Start netperf server."""
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# Kill any existing netserver
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session.cmd_status("pkill netserver")
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# Start netserver
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output = session.cmd_output("netserver", timeout=30)
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if "Starting netserver" not in output:
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# Check if it's already running
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status = session.cmd_status("pgrep netserver")
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if status != 0:
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test.fail("Failed to start netserver")
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logging.info("netserver started successfully")
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def start_tcpdump(session, vm_ip, log_file):
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"""Start tcpdump to capture UDP packets."""
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# Install tcpdump if not available
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session.cmd_status("yum install -y tcpdump || apt-get install -y tcpdump")
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# Start tcpdump in background
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tcpdump_cmd = f"tcpdump -n udp and src {vm_ip} > {log_file} 2>&1 &"
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session.cmd(tcpdump_cmd)
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logging.info("tcpdump started, capturing packets from %s", vm_ip)
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def run_netperf_udp_test(vm_session, target_ip):
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"""Run netperf UDP test from VM to target."""
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netperf_cmd = f"netperf -H {target_ip} -t UDP_STREAM -- -m 1473"
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# Run netperf test
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try:
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output = vm_session.cmd_output(netperf_cmd, timeout=120)
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logging.info("netperf UDP test completed")
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return output
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except Exception as e:
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test.fail(f"netperf UDP test failed: {e}")
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def verify_packet_capture(session, log_file, vm_ip, target_ip):
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"""Verify that UDP packets were captured."""
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# Wait a bit for packets to be written
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utils_misc.wait_for(lambda: True, 5)
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# Read tcpdump log
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try:
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output = session.cmd_output(f"cat {log_file}")
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logging.info("tcpdump log content: %s", output)
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# Look for UDP packets with expected pattern
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pattern = f"IP {vm_ip}\.\\d+ > {target_ip}\.\\d+: UDP, length 1473"
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if re.search(pattern, output):
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logging.info("UDP packets successfully captured")
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return True
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else:
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test.fail(f"Expected UDP packets not found in capture. Pattern: {pattern}")
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except Exception as e:
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test.fail(f"Failed to read tcpdump log: {e}")
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vm_name = params.get("main_vm")
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vm = env.get_vm(vm_name)
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# Migration parameters
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remote_host = params.get("remote_host")
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remote_user = params.get("remote_user", "root")
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remote_passwd = params.get("remote_passwd")
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guest_os_type = params.get("guest_os_type", "linux")
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if not remote_host:
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test.cancel("remote_host parameter is required")
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tcpdump_log = "/tmp/udp_capture.log"
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try:
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# Setup VM
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if not vm.is_alive():
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vm.start()
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vm.wait_for_login()
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vm_session = vm.wait_for_login()
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vm_ip = vm.get_address()
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logging.info("VM IP: %s", vm_ip)
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logging.info("Remote host: %s", remote_host)
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# Setup remote host session
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remote_session = remote.remote_login("ssh", remote_host, "22",
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remote_user, remote_passwd,
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r"[\#\$]\s*$")
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# Disable firewalls
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disable_firewall(vm_session, guest_os_type)
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disable_firewall(remote_session, "linux")
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# Install netperf on VM and remote host
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install_netperf(vm_session, guest_os_type)
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install_netperf(remote_session, "linux")
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# Start netserver on remote host
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start_netserver(remote_session)
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# Start packet capture on remote host
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start_tcpdump(remote_session, vm_ip, tcpdump_log)
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# Run UDP transfer test
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netperf_output = run_netperf_udp_test(vm_session, remote_host)
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# Verify packet capture
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verify_packet_capture(remote_session, tcpdump_log, vm_ip, remote_host)
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logging.info("UDP transfer test completed successfully")
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finally:
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# Cleanup
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try:
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if 'remote_session' in locals():
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# Stop tcpdump
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remote_session.cmd_status("pkill tcpdump")
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# Stop netserver
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remote_session.cmd_status("pkill netserver")
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# Remove log file
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remote_session.cmd_status(f"rm -f {tcpdump_log}")
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remote_session.close()
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except Exception as e:
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logging.warning("Cleanup failed: %s", e)
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try:
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if 'vm_session' in locals():
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vm_session.close()
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except Exception as e:
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logging.warning("VM session cleanup failed: %s", e)

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