[dts] [PATCH V1] tests/veb: fix rx and tx packet error

[Fangfang Wei]

From: Fangfangx Wei <fangfangx.wei at intel.com>

It has some io packets at beginning of starting testpmd, this case is to
verify pf or vf can receive correct packet number from tester.
So calculating rx and tx packet with start packet and end packet is correct.

Signed-off-by: Fangfangx Wei <fangfangx.wei at intel.com>
---
 tests/TestSuite_veb_switch.py | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/tests/TestSuite_veb_switch.py b/tests/TestSuite_veb_switch.py
index 01a5366..4c74e8f 100644
--- a/tests/TestSuite_veb_switch.py
+++ b/tests/TestSuite_veb_switch.py
@@ -394,29 +394,34 @@ class TestVEBSwitching(TestCase):
         self.session_secondary.send_expect("start", "testpmd>")
         time.sleep(2)
 
+        vf0_start_rx_stats = self.veb_get_pmd_stats("second", 0, "rx")
+        pf_start_tx_stats = self.veb_get_pmd_stats("first", 0, "tx")
         self.send_packet(self.vf0_mac, self.tester_itf)
         time.sleep(2)
         self.session_secondary.send_expect("stop", "testpmd>", 2)
         self.dut.send_expect("stop", "testpmd>", 2)
-        vf0_rx_stats = self.veb_get_pmd_stats("second", 0, "rx")
-        pf_tx_stats = self.veb_get_pmd_stats("first", 0, "tx")
-        self.verify(pf_tx_stats[0] == 0, "PF received unexpected packet")
-        self.verify(vf0_rx_stats[0] == 1, "no packet was received by VF0")
+        vf0_end_rx_stats = self.veb_get_pmd_stats("second", 0, "rx")
+        pf_end_tx_stats = self.veb_get_pmd_stats("first", 0, "tx")
+        self.verify(pf_end_tx_stats[0] - pf_start_tx_stats[0] == 0, "PF received unexpected packet")
+        self.verify(vf0_end_rx_stats[0] - vf0_start_rx_stats[0] == 1, "no packet was received by VF0")
  
         self.dut.send_expect("start", "testpmd>")
         time.sleep(2)
         self.session_secondary.send_expect("start", "testpmd>")
         time.sleep(2)
+        vf0_start_rx_stats = self.veb_get_pmd_stats("second", 0, "rx")
+        pf_start_tx_stats = self.veb_get_pmd_stats("first", 0, "tx")
+        pf_start_rx_stats = self.veb_get_pmd_stats("first", 0, "rx")
         self.send_packet(self.pf_mac_address, self.tester_itf)
         time.sleep(2)
         self.session_secondary.send_expect("stop", "testpmd>", 2)
         self.dut.send_expect("stop", "testpmd>", 2)
-        vf0_rx_stats = self.veb_get_pmd_stats("second", 0, "rx")
-        pf_tx_stats = self.veb_get_pmd_stats("first", 0, "tx")
-        pf_rx_stats = self.veb_get_pmd_stats("first", 0, "rx")
-        self.verify(pf_tx_stats[0] == 1, "no packet was sent by VF0")
-        self.verify(pf_rx_stats[0] == 1, "no packet was received by VF0")
-        self.verify(vf0_rx_stats[0] == 1, "no packet was received by VF0")
+        vf0_end_rx_stats = self.veb_get_pmd_stats("second", 0, "rx")
+        pf_end_tx_stats = self.veb_get_pmd_stats("first", 0, "tx")
+        pf_end_rx_stats = self.veb_get_pmd_stats("first", 0, "rx")
+        self.verify(pf_end_tx_stats[0] - pf_start_tx_stats[0] == 1, "no packet was sent by VF0")
+        self.verify(pf_end_rx_stats[0] - pf_start_rx_stats[0] == 1, "no packet was received by VF0")
+        self.verify(vf0_end_rx_stats[0] - vf0_start_rx_stats[0] == 0, "VF0 received unexpected packet")
         self.session_secondary.send_expect("quit", "# ")
         time.sleep(2)
         self.dut.send_expect("quit", "# ")
-- 
2.7.5