Fix pktgen tx test netdst conversion, mac address and vm startup issues

1. Fix netdst conversion: convert 'private' to 'atbr0' for host IP lookup
2. Fix vm startup: check if vm is alive before starting
3. Fix mac address: use tap device mac instead of default gateway mac

Signed-off-by: Wenli Quan<wquan@redhat.com>

Author: quanwenli

libvirt/tests/src/virtual_network/qemu/pktgen_burst_mode_test.py

@@ -61,7 +61,9 @@ def run_test():
                 pktgen_utils.install_package(host_ver)
 
         test.log.debug("TEST_STEP 2: Test with guest and host connectivity")
-        vm.start()
+        if not vm.is_alive():
+            vm.start()
+        vm.verify_alive()
         test.log.debug("Test with Guest xml:%s", vm_xml.VMXML.new_from_dumpxml(vm_name))
         session = vm.wait_for_serial_login(restart_network=True)
         network_base.ping_check(params, ips, session, force_ipv4=True)
@@ -96,6 +98,9 @@ def run_test():
     guest_ver_cmd = params.get("guest_ver_cmd")
     test_vm = params.get_boolean("test_vm")
     host_ver = os.uname().release
-    ips = {'host_ip': utils_net.get_host_ip_address(params)}
+    params_for_ip = params.copy()
+    if params.get("netdst") == "private":
+        params_for_ip["netdst"] = params.get("priv_brname", "atbr0")
+    ips = {'host_ip': utils_net.get_host_ip_address(params_for_ip)}
 
     run_test()

provider/virtual_network/pktgen_utils.py

@@ -41,7 +41,7 @@ def configure_pktgen(
             vm.copy_files_to(source_path, self.dest_path)
             guest_mac = vm.get_mac_address(0)
             self.interface = utils_net.get_linux_ifname(session_serial, guest_mac)
-            host_iface = utils_net.get_default_gateway(iface_name=True, force_dhcp=False, json=True)
+            host_iface = libvirt.get_ifname_host(vm.name, guest_mac)
             dsc_dev = utils_net.Interface(host_iface)
             self.dsc = dsc_dev.get_mac()
             self.runner = session_serial.cmd