1 files changed, 99 insertions, 0 deletions
diff --git a/test/vpp_pg_interface.py b/test/vpp_pg_interface.py
new file mode 100644
index 00000000000..fc4080d2ef6
--- /dev/null
+++ b/test/vpp_pg_interface.py
@@ -0,0 +1,99 @@
+import os
+from logging import error
+from scapy.utils import wrpcap, rdpcap
+from vpp_interface import VppInterface
+
+
+class VppPGInterface(VppInterface):
+    """
+    VPP packet-generator interface
+    """
+
+    @property
+    def pg_index(self):
+        """packet-generator interface index assigned by VPP"""
+        return self._pg_index
+
+    @property
+    def out_path(self):
+        """pcap file path - captured packets"""
+        return self._out_path
+
+    @property
+    def in_path(self):
+        """ pcap file path - injected packets"""
+        return self._in_path
+
+    @property
+    def capture_cli(self):
+        """CLI string to start capture on this interface"""
+        return self._capture_cli
+
+    @property
+    def cap_name(self):
+        """capture name for this interface"""
+        return self._cap_name
+
+    @property
+    def input_cli(self):
+        """CLI string to load the injected packets"""
+        return self._input_cli
+
+    def post_init_setup(self):
+        """ Perform post-init setup for super class and add our own setup """
+        super(VppPGInterface, self).post_init_setup()
+        self._out_path = self.test.tempdir + "/pg%u_out.pcap" % self.sw_if_index
+        self._in_path = self.test.tempdir + "/pg%u_in.pcap" % self.sw_if_index
+        self._capture_cli = "packet-generator capture pg%u pcap %s" % (
+            self.pg_index, self.out_path)
+        self._cap_name = "pcap%u" % self.sw_if_index
+        self._input_cli = "packet-generator new pcap %s source pg%u name %s" % (
+            self.in_path, self.pg_index, self.cap_name)
+
+    def __init__(self, test, pg_index):
+        """ Create VPP packet-generator interface """
+        self._pg_index = pg_index
+        self._test = test
+        r = self.test.vapi.pg_create_interface(self.pg_index)
+        self._sw_if_index = r.sw_if_index
+        self.post_init_setup()
+
+    def enable_capture(self):
+        """ Enable capture on this packet-generator interface"""
+        try:
+            os.unlink(self.out_path)
+        except:
+            pass
+        # FIXME this should be an API, but no such exists atm
+        self.test.vapi.cli(self.capture_cli)
+
+    def add_stream(self, pkts):
+        """
+        Add a stream of packets to this packet-generator
+
+        :param pkts: iterable packets
+
+        """
+        try:
+            os.remove(self.in_path)
+        except:
+            pass
+        wrpcap(self.in_path, pkts)
+        # FIXME this should be an API, but no such exists atm
+        self.test.vapi.cli(self.input_cli)
+        self.test.pg_streams.append(self.cap_name)
+        self.test.vapi.cli("trace add pg-input %d" % len(pkts))
+
+    def get_capture(self):
+        """
+        Get captured packets
+
+        :returns: iterable packets
+        """
+        try:
+            output = rdpcap(self.out_path)
+        except IOError:  # TODO
+            error("File %s does not exist, probably because no"
+                  " packets arrived" % self.out_path)
+            return []
+        return output