generic.tests: Add global variable _netserver_started in netperf

Add _netserver_started to judge if need setup netserver during test.
Signed-off-by: NYiqiao Pu <ypu@redhat.com>

generic/tests/netperf.py

@@ -9,6 +9,9 @@ from autotest.client.shared import error
 from virttest import utils_test, utils_misc, utils_net, remote, data_dir
 
 
+_netserver_started = False
+
+
 def format_result(result, base="12", fbase="5"):
     """
     Format the result to a fixed length string.
@@ -39,7 +42,7 @@ def netperf_record(results, filter_list, header=False, base="12", fbase="2"):
     """
     key_list = []
     for key in filter_list:
-        if results.has_key(key):
+        if key in results:
             key_list.append(key)
 
     record = ""
@@ -112,7 +115,8 @@ def run(test, params, env):
     queues = int(params.get("queues", 1))
     if queues > 1:
         if params.get("os_type") == "linux":
-            ethname = utils_net.get_linux_ifname(session, vm.get_mac_address(0))
+            ethname = utils_net.get_linux_ifname(session,
+                                                 vm.get_mac_address(0))
             session.cmd_status_output("ethtool -L %s combined %s" %
                                       (ethname, queues))
         else:
@@ -401,7 +405,11 @@ def launch_client(sessions, server, server_ctl, host, clients, l, nf_args,
     client_path = "/tmp/netperf-%s/src/netperf" % netperf_version
     server_path = "/tmp/netperf-%s/src/netserver" % netperf_version
     get_status_flag = params.get("get_status_in_guest", "no") == "yes"
+    global _netserver_started
     # Start netserver
+    if _netserver_started:
+        logging.debug("Netserver already started.")
+    else:
         error.context("Start Netserver on guest", logging.info)
         if params.get("os_type") == "windows":
             timeout = float(params.get("timeout", "240"))
@@ -430,7 +438,6 @@ def launch_client(sessions, server, server_ctl, host, clients, l, nf_args,
                             err_msg = "Install netserver cygwin failed"
                             raise error.TestNAError(err_msg)
                         logging.info("Install netserver in cygwin successfully")
-
             else:
                 start_session = server_ctl
                 netserv_start_cmd = params.get("netserv_start_cmd") % cdrom_drv