[dts] [PATCH]tests vf_to_vf_nic_bridge:fix "killall tcpdump" won't get usefull infomation

[Lijuan Tu]

we use "killall tcpdump" to get "x packets captured" infomation before.
but on some os ,it is invalid.

Signed-off-by: Lijuan Tu <lijuanx.a.tu at intel.com>
---
 tests/TestSuite_vf_to_vf_nic_bridge.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/TestSuite_vf_to_vf_nic_bridge.py b/tests/TestSuite_vf_to_vf_nic_bridge.py
index 4137404..9c5548b 100644
--- a/tests/TestSuite_vf_to_vf_nic_bridge.py
+++ b/tests/TestSuite_vf_to_vf_nic_bridge.py
@@ -187,7 +187,7 @@ class TestVF2VFBridge(TestCase):
         self.vm0_dut.restore_interfaces()
         self.vm0_ports = self.vm0_dut.get_ports('any')
         vf0_intf = self.vm0_dut.ports_info[self.vm0_ports[0]]['intf']
-        self.vm0_dut.send_expect('tcpdump -i %s -s 1000 > /dev/null &' % vf0_intf, '#', 30)
+        self.vm0_dut.send_expect('tcpdump -i %s -s 1000 ' % vf0_intf, 'tcpdump', 30)
 
         self.vm1_ports = self.vm1_dut.get_ports('any')
         self.prepare_pktgen(self.vm1_dut)
@@ -204,7 +204,7 @@ class TestVF2VFBridge(TestCase):
         self.send_stream_pktgen(self.vm1_dut)
         self.stop_stream_pktgen(self.vm1_dut)
 
-        recv_tcpdump = self.vm0_dut.send_expect('killall tcpdump', '#', 30)
+        recv_tcpdump = self.vm0_dut.send_expect('^C', '#', 30)
         time.sleep(5)
         recv_pattern = re.compile("(\d+) packets captured")
         recv_info = recv_pattern.search(recv_tcpdump)
-- 
2.5.0