make test: improve handling of packet captures

Perform accounting of expected packets based on created packet infos.
Use this accounting info to automatically expect (and verify) the
correct number of packets to be captured. Automatically retry the read
of the capture file if scapy raises an exception while doing so to
handle rare cases when capture file is read while only partially
written during busy wait. Don't fail assert_nothing_captured if only
junk packets arrived.

Change-Id: I16ec2e9410ef510d313ec16b7e13c57d0b2a63f5
Signed-off-by: Klement Sekera <ksekera@cisco.com>

1 files changed, 8 insertions, 11 deletions

diff --git a/test/test_ip4.py b/test/test_ip4.py
index f67c3b9ce32..df93533d7f2 100644
--- a/test/test_ip4.py
+++ b/test/test_ip4.py
@@ -108,8 +108,7 @@ class TestIPv4(VppTestCase):
         pkts = []
         for i in range(0, 257):
             dst_if = self.flows[src_if][i % 2]
-            info = self.create_packet_info(
-                src_if.sw_if_index, dst_if.sw_if_index)
+            info = self.create_packet_info(src_if, dst_if)
             payload = self.info_to_payload(info)
             p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
                  IP(src=src_if.remote_ip4, dst=dst_if.remote_ip4) /
@@ -254,15 +253,13 @@ class TestIPv4FibCrud(VppTestCase):
 
         for _ in range(count):
             dst_addr = random.choice(dst_ips)
-            info = self.create_packet_info(
-                src_if.sw_if_index, dst_if.sw_if_index)
+            info = self.create_packet_info(src_if, dst_if)
             payload = self.info_to_payload(info)
             p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
                  IP(src=src_if.remote_ip4, dst=dst_addr) /
                  UDP(sport=1234, dport=1234) /
                  Raw(payload))
             info.data = p.copy()
-            size = random.choice(self.pg_if_packet_sizes)
             self.extend_packet(p, random.choice(self.pg_if_packet_sizes))
             pkts.append(p)
 
@@ -270,7 +267,8 @@ class TestIPv4FibCrud(VppTestCase):
 
     def _find_ip_match(self, find_in, pkt):
         for p in find_in:
-            if self.payload_to_info(str(p[Raw])) == self.payload_to_info(str(pkt[Raw])):
+            if self.payload_to_info(str(p[Raw])) == \
+                    self.payload_to_info(str(pkt[Raw])):
                 if p[IP].src != pkt[IP].src:
                     break
                 if p[IP].dst != pkt[IP].dst:
@@ -357,7 +355,7 @@ class TestIPv4FibCrud(VppTestCase):
 
     def setUp(self):
         super(TestIPv4FibCrud, self).setUp()
-        self.packet_infos = {}
+        self.reset_packet_infos()
 
     def test_1_add_routes(self):
         """ Add 1k routes
@@ -381,10 +379,9 @@ class TestIPv4FibCrud(VppTestCase):
         self.pg_enable_capture(self.pg_interfaces)
         self.pg_start()
 
-        pkts = self.pg0.get_capture()
+        pkts = self.pg0.get_capture(len(self.stream_1) + len(self.stream_2))
         self.verify_capture(self.pg0, pkts, self.stream_1 + self.stream_2)
 
-
     def test_2_del_routes(self):
         """ Delete 100 routes
 
@@ -411,7 +408,7 @@ class TestIPv4FibCrud(VppTestCase):
         self.pg_enable_capture(self.pg_interfaces)
         self.pg_start()
 
-        pkts = self.pg0.get_capture()
+        pkts = self.pg0.get_capture(len(self.stream_1) + len(self.stream_2))
         self.verify_capture(self.pg0, pkts, self.stream_1 + self.stream_2)
 
     def test_3_add_new_routes(self):
@@ -446,7 +443,7 @@ class TestIPv4FibCrud(VppTestCase):
         self.pg_enable_capture(self.pg_interfaces)
         self.pg_start()
 
-        pkts = self.pg0.get_capture()
+        pkts = self.pg0.get_capture(len(self.stream_1) + len(self.stream_2))
         self.verify_capture(self.pg0, pkts, self.stream_1 + self.stream_2)
 
     def test_4_del_routes(self):