tests: Added bpf trace filter plugin test

Type: test

Change-Id: I026d9298fe1372d03f61b6ad57c82628bab4c831
Signed-off-by: adrianvillin <avillin@cisco.com>

test/framework.py

@@ -132,14 +132,14 @@ class VppTestCase(VppAsfTestCase):
         cls._pcaps.append((intf, worker))
 
     @classmethod
-    def pg_start(cls, trace=True):
+    def pg_start(cls, trace=True, traceFilter=False):
         """Enable the PG, wait till it is done, then clean up"""
         for intf, worker in cls._old_pcaps:
             intf.remove_old_pcap_file(intf.get_in_path(worker))
         cls._old_pcaps = []
         if trace:
             cls.vapi.cli("clear trace")
-            cls.vapi.cli("trace add pg-input 1000")
+            cls.vapi.cli("trace add pg-input 1000" + (" filter" if traceFilter else ""))
         cls.vapi.cli("packet-generator enable")
         # PG, when starts, runs to completion -
         # so let's avoid a race condition,

test/test_bpf_trace_filter.py

@@ -0,0 +1,105 @@
+from framework import VppTestCase
+from asfframework import VppTestRunner
+import unittest
+from config import config
+from scapy.layers.l2 import Ether
+from scapy.layers.inet import IP, UDP
+from random import randint
+
+
+@unittest.skipIf(
+    "bpf_trace_filter" in config.excluded_plugins,
+    "Exclude BPF Trace Filter plugin tests",
+)
+class TestBpfTraceFilter(VppTestCase):
+    """BPF Trace filter test"""
+
+    @classmethod
+    def setUpClass(cls):
+        super(TestBpfTraceFilter, 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(TestBpfTraceFilter, cls).tearDownClass()
+
+    # reset trace filter before each test
+    def setUp(self):
+        super(TestBpfTraceFilter, self).setUp()
+        self.vapi.cli("set trace filter function vnet_is_packet_traced")
+        self.vapi.cli("clear trace")
+
+    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(49152, 65535), dport=5678)
+            )
+            info.data = p.copy()
+            packets.append(p)
+        return packets
+
+    def test_bpf_trace_filter_cli(self):
+        """BPF Trace filter test [CLI]"""
+        self.vapi.cli("set bpf trace filter {{tcp}}")
+        self.vapi.cli("set trace filter function bpf_trace_filter")
+
+        packets = self.create_stream(self.pg0, self.pg1, 3)
+        self.pg0.add_stream(packets)
+        self.pg_start(traceFilter=True)
+
+        # verify that bpf trace filter has been selected
+        reply = self.vapi.cli("show trace filter function")
+        self.assertIn(
+            "(*) name:bpf_trace_filter", reply, "BPF Trace filter is not selected"
+        )
+
+        # verify that trace is empty
+        reply = self.vapi.cli("show trace")
+        self.assertIn(
+            "No packets in trace buffer",
+            reply,
+            "Unexpected packets in the trace buffer",
+        )
+
+    def test_bpf_trace_filter_vapi(self):
+        """BPF Trace filter test [VAPI]"""
+        self.vapi.bpf_trace_filter_set(filter="tcp")
+        self.vapi.trace_set_filter_function(filter_function_name="bpf_trace_filter")
+
+        packets = self.create_stream(self.pg0, self.pg1, 3)
+        self.pg0.add_stream(packets)
+        self.pg_start(traceFilter=True)
+
+        # verify that bpf trace filter has been selected
+        reply = self.vapi.cli("show trace filter function")
+        self.assertIn(
+            "(*) name:bpf_trace_filter", reply, "BPF Trace filter is not selected"
+        )
+
+        # verify that trace is empty
+        reply = self.vapi.cli("show trace")
+        self.assertIn(
+            "No packets in trace buffer",
+            reply,
+            "Unexpected packets in the trace buffer",
+        )
+
+
+if __name__ == "__main__":
+    unittest.main(testRunner=VppTestRunner)