tests: Added bufmon plugin test

Coverage increased from 35% to 94%

Type: test

Change-Id: I9a54a58bf53b29a771a93ce03998e95fbcd518eb
Signed-off-by: adrianvillin <avillin@cisco.com>

1 files changed, 130 insertions, 0 deletions

diff --git a/test/test_bufmon.py b/test/test_bufmon.py
new file mode 100644
index 00000000000..baa93740ac8
--- /dev/null
+++ b/test/test_bufmon.py
@@ -0,0 +1,130 @@
+from framework import VppTestCase, VppTestRunner
+import unittest
+from config import config
+from scapy.layers.l2 import Ether
+from scapy.packet import Raw
+from scapy.layers.inet import IP, UDP
+from random import randint
+from util import ppp
+
+
+@unittest.skipIf("bufmon" in config.excluded_plugins, "Exclude bufmon plugin tests")
+class TestBufmon(VppTestCase):
+    """bufmon plugin test"""
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestBufmon, cls).setUpClass()
+        try:
+            cls.create_pg_interfaces(range(2))
+            for i in cls.pg_interfaces:
+                i.config_ip4()
+                i.resolve_arp()
+                i.admin_up()
+        except Exception:
+            cls.tearDownClass()
+            raise
+
+    @classmethod
+    def tearDownClass(cls):
+        for i in cls.pg_interfaces:
+            i.unconfig_ip4()
+            i.admin_down()
+        super(TestBufmon, cls).tearDownClass()
+
+    # https://fd.io/docs/vpp/master/developer/tests/overview.html#example-how-to-add-a-new-test
+    def create_stream(self, src_if, dst_if, count):
+        packets = []
+        for i in range(count):
+            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)
+                / UDP(sport=randint(1000, 2000), dport=5678)
+                / Raw(payload)
+            )
+            info.data = p.copy()
+            packets.append(p)
+        return packets
+
+    def verify_capture(self, src_if, dst_if, capture):
+        packet_info = None
+        for packet in capture:
+            try:
+                ip = packet[IP]
+                udp = packet[UDP]
+                # convert the payload to packet info object
+                payload_info = self.payload_to_info(packet[Raw])
+                # make sure the indexes match
+                self.assert_equal(
+                    payload_info.src, src_if.sw_if_index, "source sw_if_index"
+                )
+                self.assert_equal(
+                    payload_info.dst, dst_if.sw_if_index, "destination sw_if_index"
+                )
+                packet_info = self.get_next_packet_info_for_interface2(
+                    src_if.sw_if_index, dst_if.sw_if_index, packet_info
+                )
+                # make sure we didn't run out of saved packets
+                self.assertIsNotNone(packet_info)
+                self.assert_equal(
+                    payload_info.index, packet_info.index, "packet info index"
+                )
+                saved_packet = packet_info.data  # fetch the saved packet
+                # assert the values match
+                self.assert_equal(ip.src, saved_packet[IP].src, "IP source address")
+                # ... more assertions here
+                self.assert_equal(udp.sport, saved_packet[UDP].sport, "UDP source port")
+            except Exception:
+                self.logger.error(ppp("Unexpected or invalid packet:", packet))
+                raise
+        remaining_packet = self.get_next_packet_info_for_interface2(
+            src_if.sw_if_index, dst_if.sw_if_index, packet_info
+        )
+        self.assertIsNone(
+            remaining_packet,
+            "Interface %s: Packet expected from interface "
+            "%s didn't arrive" % (dst_if.name, src_if.name),
+        )
+
+    def test_bufmon(self):
+        self.vapi.cli("set buffer traces on")
+
+        reply = self.vapi.cli("show buffer traces status")
+        self.assertIn("buffers tracing is on", reply)
+
+        packets = self.create_stream(self.pg0, self.pg1, 5)
+        self.pg0.add_stream(packets)
+        self.pg0.enable_capture()
+        self.pg1.enable_capture()
+        self.pg_start()
+
+        capture = self.pg1.get_capture()
+        self.pg0.assert_nothing_captured()
+        self.verify_capture(self.pg0, self.pg1, capture)
+
+        expected = [
+            "pg-input",
+            "ip4-input",
+            "ip4-rewrite",
+            "ip4-lookup",
+            "ethernet-input",
+            "pg1-tx",
+            "pg1-output",
+        ]
+        reply = self.vapi.cli("show buffer traces verbose")
+        for entry in expected:
+            self.assertIn(entry, reply)
+
+        # not verbose, skips nodes w/o buffered buffers
+        reply = self.vapi.cli("show buffer traces")
+        self.assertNotIn("pg-input", reply)
+
+        self.vapi.cli("clear buffer traces")
+        reply = self.vapi.cli("show buffer traces verbose")
+        self.assertNotIn("pg-input", reply)
+
+
+if __name__ == "__main__":
+    unittest.main(testRunner=VppTestRunner)