[dts] [PATCH V1]used tcpdump replace scapy get packet

[xu,huilong]

sometime used scapy get packet, the pcaket payload will loss. so used tcpdump get packet.

Signed-off-by: xu,huilong <huilongx.xu at intel.com>
---
 tests/TestSuite_scatter.py | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/tests/TestSuite_scatter.py b/tests/TestSuite_scatter.py
index 7a49b53..7f39d8a 100644
--- a/tests/TestSuite_scatter.py
+++ b/tests/TestSuite_scatter.py
@@ -61,6 +61,14 @@ class TestScatter(TestCase):
         else:
             self.mbsize = 1024
 
+    def start_tcpdump(self, tester_rx_intf):
+        self.tester.send_expect("rm -rf ./scatter.cap", "#")
+        self.tester.send_expect("tcpdump -i %s -x -w ./scatter.cap 2>/dev/null &" % tester_rx_intf, "#")
+
+    def get_tcpdump_packet(self):
+        self.tester.send_expect("killall tcpdump", "#")
+        return self.tester.send_expect("tcpdump -nn -x -r ./scatter.cap", "#")
+
     def scatter_pktgen_send_packet(self, sPortid, rPortid, pktsize, num=1):
         """
         Functional test for scatter packets.
@@ -73,21 +81,17 @@ class TestScatter(TestCase):
         rintf = self.tester.get_interface(rport)
         self.tester.send_expect("ifconfig %s mtu 9000" % sintf, "#")
         self.tester.send_expect("ifconfig %s mtu 9000" % rintf, "#")
-
-        self.tester.scapy_background()
-        self.tester.scapy_append(
-            'p = sniff(filter="ip",iface="%s", count=%d)' % (rintf, num))
-        self.tester.scapy_append('RESULT = str(p)')
+        self.start_tcpdump(rintf)
 
         pktlen = pktsize - 18
         padding = pktlen - 20
 
-        self.tester.scapy_foreground()
         self.tester.scapy_append(
             'sendp([Ether(src="%s",dst="%s")/IP(len=%s)/Raw(load="\x50"*%s)], iface="%s")' % (smac, dmac,pktlen, padding, sintf))
         self.tester.scapy_execute()
-        time.sleep(5)
-        res = self.tester.scapy_get_result()
+        time.sleep(5) #wait for scapy capture subprocess exit
+        res = self.get_tcpdump_packet()
+
         self.tester.send_expect("ifconfig %s mtu 1500" % sintf, "#")
         self.tester.send_expect("ifconfig %s mtu 1500" % sintf, "#")
         return res
@@ -118,7 +122,7 @@ class TestScatter(TestCase):
         for offset in [-1, 0, 1, 4, 5]:
             ret = self.scatter_pktgen_send_packet(
                 dutPorts[0], dutPorts[1], self.mbsize + offset)
-            self.verify("load='P" in ret, "packet receive error")
+            self.verify("5050 5050 5050 5050 5050 5050 5050" in ret, "packet receive error")
 
         self.dut.send_expect("stop", "testpmd> ")
         self.dut.send_expect("quit", "# ", 30)
-- 
1.9.3