L2 Flood: use the buffer clone API rather than buffer recycle

Change-Id: I40e4efd8061369efc535f0d49b2f63668b6d1d15
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>

test/test_l2_flood.py

@@ -0,0 +1,148 @@
+#!/usr/bin/env python
+
+import unittest
+import socket
+
+from framework import VppTestCase, VppTestRunner
+from vpp_ip_route import VppIpRoute, VppRoutePath
+
+from scapy.packet import Raw
+from scapy.layers.l2 import Ether
+from scapy.layers.inet import IP, UDP
+
+
+class TestL2Flood(VppTestCase):
+    """ L2-flood """
+
+    def setUp(self):
+        super(TestL2Flood, self).setUp()
+
+        # 12 l2 interface and one l3
+        self.create_pg_interfaces(range(13))
+        self.create_loopback_interfaces(1)
+
+        for i in self.pg_interfaces:
+            i.admin_up()
+        for i in self.lo_interfaces:
+            i.admin_up()
+
+        self.pg12.config_ip4()
+        self.pg12.resolve_arp()
+        self.loop0.config_ip4()
+
+    def tearDown(self):
+        self.pg12.unconfig_ip4()
+        self.loop0.unconfig_ip4()
+
+        for i in self.pg_interfaces:
+            i.admin_down()
+        for i in self.lo_interfaces:
+            i.admin_down()
+        super(TestL2Flood, self).tearDown()
+
+    def test_flood(self):
+        """ L2 Flood Tests """
+
+        #
+        # Create a single bridge Domain
+        #
+        self.vapi.bridge_domain_add_del(1)
+
+        #
+        # add each interface to the BD. 3 interfaces per split horizon group
+        #
+        for i in self.pg_interfaces[0:4]:
+            self.vapi.sw_interface_set_l2_bridge(i.sw_if_index, 1, 0)
+        for i in self.pg_interfaces[4:8]:
+            self.vapi.sw_interface_set_l2_bridge(i.sw_if_index, 1, 1)
+        for i in self.pg_interfaces[8:12]:
+            self.vapi.sw_interface_set_l2_bridge(i.sw_if_index, 1, 2)
+        for i in self.lo_interfaces:
+            self.vapi.sw_interface_set_l2_bridge(i.sw_if_index, 1, 2, bvi=1)
+
+        p = (Ether(dst="ff:ff:ff:ff:ff:ff",
+                   src="00:00:de:ad:be:ef") /
+             IP(src="10.10.10.10", dst="1.1.1.1") /
+             UDP(sport=1234, dport=1234) /
+             Raw('\xa5' * 100))
+
+        #
+        # input on pg0 expect copies on pg1->11
+        # this is in SHG=0 so its flooded to all, expect the pg0 since that's
+        # the ingress link
+        #
+        self.pg0.add_stream(p*65)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        for i in self.pg_interfaces[1:12]:
+            rx0 = i.get_capture(65, timeout=1)
+
+        self.logger.error(self.vapi.cli("sh trace"))
+
+        #
+        # input on pg4 (SHG=1) expect copies on pg0->3 (SHG=0)
+        # and pg8->11 (SHG=2)
+        #
+        self.pg4.add_stream(p*65)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        for i in self.pg_interfaces[:4]:
+            rx0 = i.get_capture(65, timeout=1)
+        for i in self.pg_interfaces[8:12]:
+            rx0 = i.get_capture(65, timeout=1)
+        for i in self.pg_interfaces[4:8]:
+            i.assert_nothing_captured(remark="Different SH group")
+
+        #
+        # An IP route so the packet that hits the BVI is sent out of pg12
+        #
+        ip_route = VppIpRoute(self, "1.1.1.1", 32,
+                              [VppRoutePath(self.pg12.remote_ip4,
+                                            self.pg12.sw_if_index)])
+        ip_route.add_vpp_config()
+
+        self.logger.info(self.vapi.cli("sh bridge 1 detail"))
+
+        #
+        # input on pg0 expect copies on pg1->12
+        # this is in SHG=0 so its flooded to all, expect the pg0 since that's
+        # the ingress link
+        #
+        self.pg0.add_stream(p*65)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        for i in self.pg_interfaces[1:]:
+            rx0 = i.get_capture(65, timeout=1)
+
+        #
+        # input on pg4 (SHG=1) expect copies on pg0->3 (SHG=0)
+        # and pg8->12 (SHG=2)
+        #
+        self.pg4.add_stream(p*65)
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        for i in self.pg_interfaces[:4]:
+            rx0 = i.get_capture(65, timeout=1)
+        for i in self.pg_interfaces[8:13]:
+            rx0 = i.get_capture(65, timeout=1)
+        for i in self.pg_interfaces[4:8]:
+            i.assert_nothing_captured(remark="Different SH group")
+
+        #
+        # cleanup
+        #
+        for i in self.pg_interfaces[:12]:
+            self.vapi.sw_interface_set_l2_bridge(i.sw_if_index, 1, enable=0)
+        for i in self.lo_interfaces:
+            self.vapi.sw_interface_set_l2_bridge(i.sw_if_index, 1, 2,
+                                                 bvi=1, enable=0)
+
+        self.vapi.bridge_domain_add_del(1, is_add=0)
+
+
+if __name__ == '__main__':
+    unittest.main(testRunner=VppTestRunner)