tests: replace pycodestyle with black

Drop pycodestyle for code style checking in favor of black. Black is
much faster, stable PEP8 compliant code style checker offering also
automatic formatting. It aims to be very stable and produce smallest
diffs. It's used by many small and big projects.

Running checkstyle with black takes a few seconds with a terse output.
Thus, test-checkstyle-diff is no longer necessary.

Expand scope of checkstyle to all python files in the repo, replacing
test-checkstyle with checkstyle-python.

Also, fixstyle-python is now available for automatic style formatting.

Note: python virtualenv has been consolidated in test/Makefile,
test/requirements*.txt which will eventually be moved to a central
location.  This is required to simply the automated generation of
docker executor images in the CI.

Type: improvement
Change-Id: I022a326603485f58585e879ac0f697fceefbc9c8
Signed-off-by: Klement Sekera <klement.sekera@gmail.com>
Signed-off-by: Dave Wallace <dwallacelf@gmail.com>

1 files changed, 376 insertions, 337 deletions

diff --git a/test/test_gre.py b/test/test_gre.py
index ba20ba8dec0..a79819ed73c 100644
--- a/test/test_gre.py
+++ b/test/test_gre.py
@@ -15,8 +15,13 @@ from vpp_sub_interface import L2_VTR_OP, VppDot1QSubint
 from vpp_gre_interface import VppGreInterface
 from vpp_teib import VppTeib
 from vpp_ip import DpoProto
-from vpp_ip_route import VppIpRoute, VppRoutePath, VppIpTable, FibPathProto, \
-    VppMplsLabel
+from vpp_ip_route import (
+    VppIpRoute,
+    VppRoutePath,
+    VppIpTable,
+    FibPathProto,
+    VppMplsLabel,
+)
 from vpp_mpls_tunnel_interface import VppMPLSTunnelInterface
 from util import ppp, ppc
 from vpp_papi import VppEnum
@@ -24,7 +29,7 @@ from vpp_papi import VppEnum
 
 @tag_fixme_vpp_workers
 class TestGREInputNodes(VppTestCase):
-    """ GRE Input Nodes Test Case """
+    """GRE Input Nodes Test Case"""
 
     def setUp(self):
         super(TestGREInputNodes, self).setUp()
@@ -43,16 +48,17 @@ class TestGREInputNodes(VppTestCase):
         super(TestGREInputNodes, self).tearDown()
 
     def test_gre_input_node(self):
-        """ GRE gre input nodes not registerd unless configured """
-        pkt = (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) /
-               IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4) /
-               GRE())
+        """GRE gre input nodes not registerd unless configured"""
+        pkt = (
+            Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+            / IP(src=self.pg0.remote_ip4, dst=self.pg0.local_ip4)
+            / GRE()
+        )
 
         self.pg0.add_stream(pkt)
         self.pg_start()
         # no tunnel created, gre-input not registered
-        err = self.statistics.get_counter(
-            '/err/ip4-local/unknown ip protocol')[0]
+        err = self.statistics.get_counter("/err/ip4-local/unknown ip protocol")[0]
         self.assertEqual(err, 1)
         err_count = err
 
@@ -63,14 +69,13 @@ class TestGREInputNodes(VppTestCase):
         self.pg0.add_stream(pkt)
         self.pg_start()
         # tunnel created, gre-input registered
-        err = self.statistics.get_counter(
-            '/err/ip4-local/unknown ip protocol')[0]
+        err = self.statistics.get_counter("/err/ip4-local/unknown ip protocol")[0]
         # expect no new errors
         self.assertEqual(err, err_count)
 
 
 class TestGRE(VppTestCase):
-    """ GRE Test Case """
+    """GRE Test Case"""
 
     @classmethod
     def setUpClass(cls):
@@ -118,10 +123,12 @@ class TestGRE(VppTestCase):
         for i in range(0, 257):
             info = self.create_packet_info(src_if, src_if)
             payload = self.info_to_payload(info)
-            p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
-                 IP(src=src_ip, dst=dst_ip, tos=tos) /
-                 UDP(sport=1234, dport=1234) /
-                 Raw(payload))
+            p = (
+                Ether(dst=src_if.local_mac, src=src_if.remote_mac)
+                / IP(src=src_ip, dst=dst_ip, tos=tos)
+                / UDP(sport=1234, dport=1234)
+                / Raw(payload)
+            )
             info.data = p.copy()
             pkts.append(p)
         return pkts
@@ -132,107 +139,107 @@ class TestGRE(VppTestCase):
         for i in range(0, 257):
             info = self.create_packet_info(src_if, src_if)
             payload = self.info_to_payload(info)
-            p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
-                 IPv6(src=src_ip, dst=dst_ip, tc=tc) /
-                 UDP(sport=1234, dport=1234) /
-                 Raw(payload))
+            p = (
+                Ether(dst=src_if.local_mac, src=src_if.remote_mac)
+                / IPv6(src=src_ip, dst=dst_ip, tc=tc)
+                / UDP(sport=1234, dport=1234)
+                / Raw(payload)
+            )
             info.data = p.copy()
             pkts.append(p)
         return pkts
 
-    def create_tunnel_stream_4o4(self, src_if,
-                                 tunnel_src, tunnel_dst,
-                                 src_ip, dst_ip):
+    def create_tunnel_stream_4o4(self, src_if, tunnel_src, tunnel_dst, src_ip, dst_ip):
         pkts = []
         for i in range(0, 257):
             info = self.create_packet_info(src_if, src_if)
             payload = self.info_to_payload(info)
-            p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
-                 IP(src=tunnel_src, dst=tunnel_dst) /
-                 GRE() /
-                 IP(src=src_ip, dst=dst_ip) /
-                 UDP(sport=1234, dport=1234) /
-                 Raw(payload))
+            p = (
+                Ether(dst=src_if.local_mac, src=src_if.remote_mac)
+                / IP(src=tunnel_src, dst=tunnel_dst)
+                / GRE()
+                / IP(src=src_ip, dst=dst_ip)
+                / UDP(sport=1234, dport=1234)
+                / Raw(payload)
+            )
             info.data = p.copy()
             pkts.append(p)
         return pkts
 
-    def create_tunnel_stream_6o4(self, src_if,
-                                 tunnel_src, tunnel_dst,
-                                 src_ip, dst_ip):
+    def create_tunnel_stream_6o4(self, src_if, tunnel_src, tunnel_dst, src_ip, dst_ip):
         pkts = []
         for i in range(0, 257):
             info = self.create_packet_info(src_if, src_if)
             payload = self.info_to_payload(info)
-            p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
-                 IP(src=tunnel_src, dst=tunnel_dst) /
-                 GRE() /
-                 IPv6(src=src_ip, dst=dst_ip) /
-                 UDP(sport=1234, dport=1234) /
-                 Raw(payload))
+            p = (
+                Ether(dst=src_if.local_mac, src=src_if.remote_mac)
+                / IP(src=tunnel_src, dst=tunnel_dst)
+                / GRE()
+                / IPv6(src=src_ip, dst=dst_ip)
+                / UDP(sport=1234, dport=1234)
+                / Raw(payload)
+            )
             info.data = p.copy()
             pkts.append(p)
         return pkts
 
-    def create_tunnel_stream_6o6(self, src_if,
-                                 tunnel_src, tunnel_dst,
-                                 src_ip, dst_ip):
+    def create_tunnel_stream_6o6(self, src_if, tunnel_src, tunnel_dst, src_ip, dst_ip):
         pkts = []
         for i in range(0, 257):
             info = self.create_packet_info(src_if, src_if)
             payload = self.info_to_payload(info)
-            p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
-                 IPv6(src=tunnel_src, dst=tunnel_dst) /
-                 GRE() /
-                 IPv6(src=src_ip, dst=dst_ip) /
-                 UDP(sport=1234, dport=1234) /
-                 Raw(payload))
+            p = (
+                Ether(dst=src_if.local_mac, src=src_if.remote_mac)
+                / IPv6(src=tunnel_src, dst=tunnel_dst)
+                / GRE()
+                / IPv6(src=src_ip, dst=dst_ip)
+                / UDP(sport=1234, dport=1234)
+                / Raw(payload)
+            )
             info.data = p.copy()
             pkts.append(p)
         return pkts
 
-    def create_tunnel_stream_l2o4(self, src_if,
-                                  tunnel_src, tunnel_dst):
+    def create_tunnel_stream_l2o4(self, src_if, tunnel_src, tunnel_dst):
         pkts = []
         for i in range(0, 257):
             info = self.create_packet_info(src_if, src_if)
             payload = self.info_to_payload(info)
-            p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
-                 IP(src=tunnel_src, dst=tunnel_dst) /
-                 GRE() /
-                 Ether(dst=RandMAC('*:*:*:*:*:*'),
-                       src=RandMAC('*:*:*:*:*:*')) /
-                 IP(src=scapy.compat.raw(RandIP()),
-                    dst=scapy.compat.raw(RandIP())) /
-                 UDP(sport=1234, dport=1234) /
-                 Raw(payload))
+            p = (
+                Ether(dst=src_if.local_mac, src=src_if.remote_mac)
+                / IP(src=tunnel_src, dst=tunnel_dst)
+                / GRE()
+                / Ether(dst=RandMAC("*:*:*:*:*:*"), src=RandMAC("*:*:*:*:*:*"))
+                / IP(src=scapy.compat.raw(RandIP()), dst=scapy.compat.raw(RandIP()))
+                / UDP(sport=1234, dport=1234)
+                / Raw(payload)
+            )
             info.data = p.copy()
             pkts.append(p)
         return pkts
 
-    def create_tunnel_stream_vlano4(self, src_if,
-                                    tunnel_src, tunnel_dst, vlan):
+    def create_tunnel_stream_vlano4(self, src_if, tunnel_src, tunnel_dst, vlan):
         pkts = []
         for i in range(0, 257):
             info = self.create_packet_info(src_if, src_if)
             payload = self.info_to_payload(info)
-            p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
-                 IP(src=tunnel_src, dst=tunnel_dst) /
-                 GRE() /
-                 Ether(dst=RandMAC('*:*:*:*:*:*'),
-                       src=RandMAC('*:*:*:*:*:*')) /
-                 Dot1Q(vlan=vlan) /
-                 IP(src=scapy.compat.raw(RandIP()),
-                    dst=scapy.compat.raw(RandIP())) /
-                 UDP(sport=1234, dport=1234) /
-                 Raw(payload))
+            p = (
+                Ether(dst=src_if.local_mac, src=src_if.remote_mac)
+                / IP(src=tunnel_src, dst=tunnel_dst)
+                / GRE()
+                / Ether(dst=RandMAC("*:*:*:*:*:*"), src=RandMAC("*:*:*:*:*:*"))
+                / Dot1Q(vlan=vlan)
+                / IP(src=scapy.compat.raw(RandIP()), dst=scapy.compat.raw(RandIP()))
+                / UDP(sport=1234, dport=1234)
+                / Raw(payload)
+            )
             info.data = p.copy()
             pkts.append(p)
         return pkts
 
-    def verify_tunneled_4o4(self, src_if, capture, sent,
-                            tunnel_src, tunnel_dst,
-                            dscp=0, ecn=0):
+    def verify_tunneled_4o4(
+        self, src_if, capture, sent, tunnel_src, tunnel_dst, dscp=0, ecn=0
+    ):
 
         self.assertEqual(len(capture), len(sent))
         tos = (dscp << 2) | ecn
@@ -263,9 +270,9 @@ class TestGRE(VppTestCase):
                 self.logger.error(ppp("Tx:", tx))
                 raise
 
-    def verify_tunneled_6o6(self, src_if, capture, sent,
-                            tunnel_src, tunnel_dst,
-                            dscp=0, ecn=0):
+    def verify_tunneled_6o6(
+        self, src_if, capture, sent, tunnel_src, tunnel_dst, dscp=0, ecn=0
+    ):
 
         self.assertEqual(len(capture), len(sent))
         tc = (dscp << 2) | ecn
@@ -296,8 +303,7 @@ class TestGRE(VppTestCase):
                 self.logger.error(ppp("Tx:", tx))
                 raise
 
-    def verify_tunneled_4o6(self, src_if, capture, sent,
-                            tunnel_src, tunnel_dst):
+    def verify_tunneled_4o6(self, src_if, capture, sent, tunnel_src, tunnel_dst):
 
         self.assertEqual(len(capture), len(sent))
 
@@ -326,8 +332,7 @@ class TestGRE(VppTestCase):
                 self.logger.error(ppp("Tx:", tx))
                 raise
 
-    def verify_tunneled_6o4(self, src_if, capture, sent,
-                            tunnel_src, tunnel_dst):
+    def verify_tunneled_6o4(self, src_if, capture, sent, tunnel_src, tunnel_dst):
 
         self.assertEqual(len(capture), len(sent))
 
@@ -354,8 +359,7 @@ class TestGRE(VppTestCase):
                 self.logger.error(ppp("Tx:", tx))
                 raise
 
-    def verify_tunneled_l2o4(self, src_if, capture, sent,
-                             tunnel_src, tunnel_dst):
+    def verify_tunneled_l2o4(self, src_if, capture, sent, tunnel_src, tunnel_dst):
         self.assertEqual(len(capture), len(sent))
 
         for i in range(len(capture)):
@@ -387,8 +391,9 @@ class TestGRE(VppTestCase):
                 self.logger.error(ppp("Tx:", tx))
                 raise
 
-    def verify_tunneled_vlano4(self, src_if, capture, sent,
-                               tunnel_src, tunnel_dst, vlan):
+    def verify_tunneled_vlano4(
+        self, src_if, capture, sent, tunnel_src, tunnel_dst, vlan
+    ):
         try:
             self.assertEqual(len(capture), len(sent))
         except:
@@ -495,7 +500,7 @@ class TestGRE(VppTestCase):
                 raise
 
     def test_gre(self):
-        """ GRE IPv4 tunnel Tests """
+        """GRE IPv4 tunnel Tests"""
 
         #
         # Create an L3 GRE tunnel.
@@ -503,9 +508,7 @@ class TestGRE(VppTestCase):
         #  - assign an IP Addres
         #  - Add a route via the tunnel
         #
-        gre_if = VppGreInterface(self,
-                                 self.pg0.local_ip4,
-                                 "1.1.1.2")
+        gre_if = VppGreInterface(self, self.pg0.local_ip4, "1.1.1.2")
         gre_if.add_vpp_config()
 
         #
@@ -522,9 +525,9 @@ class TestGRE(VppTestCase):
         gre_if.admin_up()
         gre_if.config_ip4()
 
-        route_via_tun = VppIpRoute(self, "4.4.4.4", 32,
-                                   [VppRoutePath("0.0.0.0",
-                                                 gre_if.sw_if_index)])
+        route_via_tun = VppIpRoute(
+            self, "4.4.4.4", 32, [VppRoutePath("0.0.0.0", gre_if.sw_if_index)]
+        )
 
         route_via_tun.add_vpp_config()
 
@@ -541,9 +544,12 @@ class TestGRE(VppTestCase):
         #
         # Add a route that resolves the tunnel's destination
         #
-        route_tun_dst = VppIpRoute(self, "1.1.1.2", 32,
-                                   [VppRoutePath(self.pg0.remote_ip4,
-                                                 self.pg0.sw_if_index)])
+        route_tun_dst = VppIpRoute(
+            self,
+            "1.1.1.2",
+            32,
+            [VppRoutePath(self.pg0.remote_ip4, self.pg0.sw_if_index)],
+        )
         route_tun_dst.add_vpp_config()
 
         #
@@ -552,18 +558,19 @@ class TestGRE(VppTestCase):
         #
         tx = self.create_stream_ip4(self.pg0, "5.5.5.5", "4.4.4.4")
         rx = self.send_and_expect(self.pg0, tx, self.pg0)
-        self.verify_tunneled_4o4(self.pg0, rx, tx,
-                                 self.pg0.local_ip4, "1.1.1.2")
+        self.verify_tunneled_4o4(self.pg0, rx, tx, self.pg0.local_ip4, "1.1.1.2")
 
         #
         # Send tunneled packets that match the created tunnel and
         # are decapped and forwarded
         #
-        tx = self.create_tunnel_stream_4o4(self.pg0,
-                                           "1.1.1.2",
-                                           self.pg0.local_ip4,
-                                           self.pg0.local_ip4,
-                                           self.pg0.remote_ip4)
+        tx = self.create_tunnel_stream_4o4(
+            self.pg0,
+            "1.1.1.2",
+            self.pg0.local_ip4,
+            self.pg0.local_ip4,
+            self.pg0.remote_ip4,
+        )
         rx = self.send_and_expect(self.pg0, tx, self.pg0)
         self.verify_decapped_4o4(self.pg0, rx, tx)
 
@@ -571,14 +578,16 @@ class TestGRE(VppTestCase):
         # Send tunneled packets that do not match the tunnel's src
         #
         self.vapi.cli("clear trace")
-        tx = self.create_tunnel_stream_4o4(self.pg0,
-                                           "1.1.1.3",
-                                           self.pg0.local_ip4,
-                                           self.pg0.local_ip4,
-                                           self.pg0.remote_ip4)
+        tx = self.create_tunnel_stream_4o4(
+            self.pg0,
+            "1.1.1.3",
+            self.pg0.local_ip4,
+            self.pg0.local_ip4,
+            self.pg0.remote_ip4,
+        )
         self.send_and_assert_no_replies(
-            self.pg0, tx,
-            remark="GRE packets forwarded despite no SRC address match")
+            self.pg0, tx, remark="GRE packets forwarded despite no SRC address match"
+        )
 
         #
         # Configure IPv6 on the PG interface so we can route IPv6
@@ -591,14 +600,18 @@ class TestGRE(VppTestCase):
         # Send IPv6 tunnel encapslated packets
         #  - dropped since IPv6 is not enabled on the tunnel
         #
-        tx = self.create_tunnel_stream_6o4(self.pg0,
-                                           "1.1.1.2",
-                                           self.pg0.local_ip4,
-                                           self.pg0.local_ip6,
-                                           self.pg0.remote_ip6)
-        self.send_and_assert_no_replies(self.pg0, tx,
-                                        "IPv6 GRE packets forwarded "
-                                        "despite IPv6 not enabled on tunnel")
+        tx = self.create_tunnel_stream_6o4(
+            self.pg0,
+            "1.1.1.2",
+            self.pg0.local_ip4,
+            self.pg0.local_ip6,
+            self.pg0.remote_ip6,
+        )
+        self.send_and_assert_no_replies(
+            self.pg0,
+            tx,
+            "IPv6 GRE packets forwarded despite IPv6 not enabled on tunnel",
+        )
 
         #
         # Enable IPv6 on the tunnel
@@ -609,11 +622,13 @@ class TestGRE(VppTestCase):
         # Send IPv6 tunnel encapslated packets
         #  - forwarded since IPv6 is enabled on the tunnel
         #
-        tx = self.create_tunnel_stream_6o4(self.pg0,
-                                           "1.1.1.2",
-                                           self.pg0.local_ip4,
-                                           self.pg0.local_ip6,
-                                           self.pg0.remote_ip6)
+        tx = self.create_tunnel_stream_6o4(
+            self.pg0,
+            "1.1.1.2",
+            self.pg0.local_ip4,
+            self.pg0.local_ip6,
+            self.pg0.remote_ip6,
+        )
         rx = self.send_and_expect(self.pg0, tx, self.pg0)
         self.verify_decapped_6o4(self.pg0, rx, tx)
 
@@ -621,31 +636,32 @@ class TestGRE(VppTestCase):
         # Send v6 packets for v4 encap
         #
         route6_via_tun = VppIpRoute(
-            self, "2001::1", 128,
-            [VppRoutePath("::",
-                          gre_if.sw_if_index,
-                          proto=DpoProto.DPO_PROTO_IP6)])
+            self,
+            "2001::1",
+            128,
+            [VppRoutePath("::", gre_if.sw_if_index, proto=DpoProto.DPO_PROTO_IP6)],
+        )
         route6_via_tun.add_vpp_config()
 
         tx = self.create_stream_ip6(self.pg0, "2001::2", "2001::1")
         rx = self.send_and_expect(self.pg0, tx, self.pg0)
 
-        self.verify_tunneled_6o4(self.pg0, rx, tx,
-                                 self.pg0.local_ip4, "1.1.1.2")
+        self.verify_tunneled_6o4(self.pg0, rx, tx, self.pg0.local_ip4, "1.1.1.2")
 
         #
         # add a labelled route through the tunnel
         #
-        label_via_tun = VppIpRoute(self, "5.4.3.2", 32,
-                                   [VppRoutePath("0.0.0.0",
-                                                 gre_if.sw_if_index,
-                                                 labels=[VppMplsLabel(33)])])
+        label_via_tun = VppIpRoute(
+            self,
+            "5.4.3.2",
+            32,
+            [VppRoutePath("0.0.0.0", gre_if.sw_if_index, labels=[VppMplsLabel(33)])],
+        )
         label_via_tun.add_vpp_config()
 
         tx = self.create_stream_ip4(self.pg0, "5.5.5.5", "5.4.3.2")
         rx = self.send_and_expect(self.pg0, tx, self.pg0)
-        self.verify_tunneled_4o4(self.pg0, rx, tx,
-                                 self.pg0.local_ip4, "1.1.1.2")
+        self.verify_tunneled_4o4(self.pg0, rx, tx, self.pg0.local_ip4, "1.1.1.2")
 
         #
         # an MPLS tunnel over the GRE tunnel add a route through
@@ -653,31 +669,40 @@ class TestGRE(VppTestCase):
         #
         mpls_tun = VppMPLSTunnelInterface(
             self,
-            [VppRoutePath("0.0.0.0",
-                          gre_if.sw_if_index,
-                          labels=[VppMplsLabel(44),
-                                  VppMplsLabel(46)])])
+            [
+                VppRoutePath(
+                    "0.0.0.0",
+                    gre_if.sw_if_index,
+                    labels=[VppMplsLabel(44), VppMplsLabel(46)],
+                )
+            ],
+        )
         mpls_tun.add_vpp_config()
         mpls_tun.admin_up()
 
-        label_via_mpls = VppIpRoute(self, "5.4.3.1", 32,
-                                    [VppRoutePath("0.0.0.0",
-                                                  mpls_tun.sw_if_index,
-                                                  labels=[VppMplsLabel(33)])])
+        label_via_mpls = VppIpRoute(
+            self,
+            "5.4.3.1",
+            32,
+            [VppRoutePath("0.0.0.0", mpls_tun.sw_if_index, labels=[VppMplsLabel(33)])],
+        )
         label_via_mpls.add_vpp_config()
 
         tx = self.create_stream_ip4(self.pg0, "5.5.5.5", "5.4.3.1")
         rx = self.send_and_expect(self.pg0, tx, self.pg0)
-        self.verify_tunneled_4o4(self.pg0, rx, tx,
-                                 self.pg0.local_ip4, "1.1.1.2")
+        self.verify_tunneled_4o4(self.pg0, rx, tx, self.pg0.local_ip4, "1.1.1.2")
 
         mpls_tun_l2 = VppMPLSTunnelInterface(
             self,
-            [VppRoutePath("0.0.0.0",
-                          gre_if.sw_if_index,
-                          labels=[VppMplsLabel(44),
-                                  VppMplsLabel(46)])],
-            is_l2=1)
+            [
+                VppRoutePath(
+                    "0.0.0.0",
+                    gre_if.sw_if_index,
+                    labels=[VppMplsLabel(44), VppMplsLabel(46)],
+                )
+            ],
+            is_l2=1,
+        )
         mpls_tun_l2.add_vpp_config()
         mpls_tun_l2.admin_up()
 
@@ -696,7 +721,7 @@ class TestGRE(VppTestCase):
         self.pg0.unconfig_ip6()
 
     def test_gre6(self):
-        """ GRE IPv6 tunnel Tests """
+        """GRE IPv6 tunnel Tests"""
 
         self.pg1.config_ip6()
         self.pg1.resolve_ndp()
@@ -707,16 +732,14 @@ class TestGRE(VppTestCase):
         #  - assign an IP Address
         #  - Add a route via the tunnel
         #
-        gre_if = VppGreInterface(self,
-                                 self.pg2.local_ip6,
-                                 "1002::1")
+        gre_if = VppGreInterface(self, self.pg2.local_ip6, "1002::1")
         gre_if.add_vpp_config()
         gre_if.admin_up()
         gre_if.config_ip6()
 
-        route_via_tun = VppIpRoute(self, "4004::1", 128,
-                                   [VppRoutePath("0::0",
-                                                 gre_if.sw_if_index)])
+        route_via_tun = VppIpRoute(
+            self, "4004::1", 128, [VppRoutePath("0::0", gre_if.sw_if_index)]
+        )
 
         route_via_tun.add_vpp_config()
 
@@ -728,15 +751,18 @@ class TestGRE(VppTestCase):
         #
         tx = self.create_stream_ip6(self.pg2, "5005::1", "4004::1")
         self.send_and_assert_no_replies(
-            self.pg2, tx,
-            "GRE packets forwarded without DIP resolved")
+            self.pg2, tx, "GRE packets forwarded without DIP resolved"
+        )
 
         #
         # Add a route that resolves the tunnel's destination
         #
-        route_tun_dst = VppIpRoute(self, "1002::1", 128,
-                                   [VppRoutePath(self.pg2.remote_ip6,
-                                                 self.pg2.sw_if_index)])
+        route_tun_dst = VppIpRoute(
+            self,
+            "1002::1",
+            128,
+            [VppRoutePath(self.pg2.remote_ip6, self.pg2.sw_if_index)],
+        )
         route_tun_dst.add_vpp_config()
 
         #
@@ -745,17 +771,14 @@ class TestGRE(VppTestCase):
         #
         tx = self.create_stream_ip6(self.pg2, "5005::1", "4004::1")
         rx = self.send_and_expect(self.pg2, tx, self.pg2)
-        self.verify_tunneled_6o6(self.pg2, rx, tx,
-                                 self.pg2.local_ip6, "1002::1")
+        self.verify_tunneled_6o6(self.pg2, rx, tx, self.pg2.local_ip6, "1002::1")
 
         #
         # Test decap. decapped packets go out pg1
         #
-        tx = self.create_tunnel_stream_6o6(self.pg2,
-                                           "1002::1",
-                                           self.pg2.local_ip6,
-                                           "2001::1",
-                                           self.pg1.remote_ip6)
+        tx = self.create_tunnel_stream_6o6(
+            self.pg2, "1002::1", self.pg2.local_ip6, "2001::1", self.pg1.remote_ip6
+        )
         rx = self.send_and_expect(self.pg2, tx, self.pg1)
 
         #
@@ -767,16 +790,15 @@ class TestGRE(VppTestCase):
         #
         # Send v4 over v6
         #
-        route4_via_tun = VppIpRoute(self, "1.1.1.1", 32,
-                                    [VppRoutePath("0.0.0.0",
-                                                  gre_if.sw_if_index)])
+        route4_via_tun = VppIpRoute(
+            self, "1.1.1.1", 32, [VppRoutePath("0.0.0.0", gre_if.sw_if_index)]
+        )
         route4_via_tun.add_vpp_config()
 
         tx = self.create_stream_ip4(self.pg0, "1.1.1.2", "1.1.1.1")
         rx = self.send_and_expect(self.pg0, tx, self.pg2)
 
-        self.verify_tunneled_4o6(self.pg0, rx, tx,
-                                 self.pg2.local_ip6, "1002::1")
+        self.verify_tunneled_4o6(self.pg0, rx, tx, self.pg2.local_ip6, "1002::1")
 
         #
         # test case cleanup
@@ -790,7 +812,7 @@ class TestGRE(VppTestCase):
         self.pg1.unconfig_ip6()
 
     def test_gre_vrf(self):
-        """ GRE tunnel VRF Tests """
+        """GRE tunnel VRF Tests"""
 
         e = VppEnum.vl_api_tunnel_encap_decap_flags_t
 
@@ -802,11 +824,15 @@ class TestGRE(VppTestCase):
         #  - assign an IP Addres
         #
         gre_if = VppGreInterface(
-            self, self.pg1.local_ip4,
+            self,
+            self.pg1.local_ip4,
             "2.2.2.2",
             outer_table_id=1,
-            flags=(e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP |
-                   e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN))
+            flags=(
+                e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP
+                | e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN
+            ),
+        )
 
         gre_if.add_vpp_config()
         gre_if.admin_up()
@@ -815,18 +841,22 @@ class TestGRE(VppTestCase):
         #
         # Add a route via the tunnel - in the overlay
         #
-        route_via_tun = VppIpRoute(self, "9.9.9.9", 32,
-                                   [VppRoutePath("0.0.0.0",
-                                                 gre_if.sw_if_index)])
+        route_via_tun = VppIpRoute(
+            self, "9.9.9.9", 32, [VppRoutePath("0.0.0.0", gre_if.sw_if_index)]
+        )
         route_via_tun.add_vpp_config()
 
         #
         # Add a route that resolves the tunnel's destination - in the
         # underlay table
         #
-        route_tun_dst = VppIpRoute(self, "2.2.2.2", 32, table_id=1,
-                                   paths=[VppRoutePath(self.pg1.remote_ip4,
-                                                       self.pg1.sw_if_index)])
+        route_tun_dst = VppIpRoute(
+            self,
+            "2.2.2.2",
+            32,
+            table_id=1,
+            paths=[VppRoutePath(self.pg1.remote_ip4, self.pg1.sw_if_index)],
+        )
         route_tun_dst.add_vpp_config()
 
         #
@@ -835,12 +865,11 @@ class TestGRE(VppTestCase):
         #  - packets are GRE encapped
         #
         self.vapi.cli("clear trace")
-        tx = self.create_stream_ip4(self.pg0, "5.5.5.5", "9.9.9.9",
-                                    dscp=5, ecn=3)
+        tx = self.create_stream_ip4(self.pg0, "5.5.5.5", "9.9.9.9", dscp=5, ecn=3)
         rx = self.send_and_expect(self.pg0, tx, self.pg1)
-        self.verify_tunneled_4o4(self.pg1, rx, tx,
-                                 self.pg1.local_ip4, "2.2.2.2",
-                                 dscp=5, ecn=3)
+        self.verify_tunneled_4o4(
+            self.pg1, rx, tx, self.pg1.local_ip4, "2.2.2.2", dscp=5, ecn=3
+        )
 
         #
         # Send tunneled packets that match the created tunnel and
@@ -848,11 +877,13 @@ class TestGRE(VppTestCase):
         # does not happen in the encap table
         #
         self.vapi.cli("clear trace")
-        tx = self.create_tunnel_stream_4o4(self.pg1,
-                                           "2.2.2.2",
-                                           self.pg1.local_ip4,
-                                           self.pg0.local_ip4,
-                                           self.pg0.remote_ip4)
+        tx = self.create_tunnel_stream_4o4(
+            self.pg1,
+            "2.2.2.2",
+            self.pg1.local_ip4,
+            self.pg0.local_ip4,
+            self.pg0.remote_ip4,
+        )
         rx = self.send_and_expect(self.pg1, tx, self.pg0)
         self.verify_decapped_4o4(self.pg0, rx, tx)
 
@@ -865,14 +896,16 @@ class TestGRE(VppTestCase):
         #
         self.pg2.config_ip4()
         self.vapi.cli("clear trace")
-        tx = self.create_tunnel_stream_4o4(self.pg2,
-                                           "2.2.2.2",
-                                           self.pg1.local_ip4,
-                                           self.pg0.local_ip4,
-                                           self.pg0.remote_ip4)
+        tx = self.create_tunnel_stream_4o4(
+            self.pg2,
+            "2.2.2.2",
+            self.pg1.local_ip4,
+            self.pg0.local_ip4,
+            self.pg0.remote_ip4,
+        )
         rx = self.send_and_assert_no_replies(
-            self.pg2, tx,
-            "GRE decap packets in wrong VRF")
+            self.pg2, tx, "GRE decap packets in wrong VRF"
+        )
 
         self.pg2.unconfig_ip4()
 
@@ -884,17 +917,23 @@ class TestGRE(VppTestCase):
         gre_if.remove_vpp_config()
 
     def test_gre_l2(self):
-        """ GRE tunnel L2 Tests """
+        """GRE tunnel L2 Tests"""
 
         #
         # Add routes to resolve the tunnel destinations
         #
-        route_tun1_dst = VppIpRoute(self, "2.2.2.2", 32,
-                                    [VppRoutePath(self.pg0.remote_ip4,
-                                                  self.pg0.sw_if_index)])
-        route_tun2_dst = VppIpRoute(self, "2.2.2.3", 32,
-                                    [VppRoutePath(self.pg0.remote_ip4,
-                                                  self.pg0.sw_if_index)])
+        route_tun1_dst = VppIpRoute(
+            self,
+            "2.2.2.2",
+            32,
+            [VppRoutePath(self.pg0.remote_ip4, self.pg0.sw_if_index)],
+        )
+        route_tun2_dst = VppIpRoute(
+            self,
+            "2.2.2.3",
+            32,
+            [VppRoutePath(self.pg0.remote_ip4, self.pg0.sw_if_index)],
+        )
 
         route_tun1_dst.add_vpp_config()
         route_tun2_dst.add_vpp_config()
@@ -902,53 +941,49 @@ class TestGRE(VppTestCase):
         #
         # Create 2 L2 GRE tunnels and x-connect them
         #
-        gre_if1 = VppGreInterface(self, self.pg0.local_ip4,
-                                  "2.2.2.2",
-                                  type=(VppEnum.vl_api_gre_tunnel_type_t.
-                                        GRE_API_TUNNEL_TYPE_TEB))
-        gre_if2 = VppGreInterface(self, self.pg0.local_ip4,
-                                  "2.2.2.3",
-                                  type=(VppEnum.vl_api_gre_tunnel_type_t.
-                                        GRE_API_TUNNEL_TYPE_TEB))
+        gre_if1 = VppGreInterface(
+            self,
+            self.pg0.local_ip4,
+            "2.2.2.2",
+            type=(VppEnum.vl_api_gre_tunnel_type_t.GRE_API_TUNNEL_TYPE_TEB),
+        )
+        gre_if2 = VppGreInterface(
+            self,
+            self.pg0.local_ip4,
+            "2.2.2.3",
+            type=(VppEnum.vl_api_gre_tunnel_type_t.GRE_API_TUNNEL_TYPE_TEB),
+        )
         gre_if1.add_vpp_config()
         gre_if2.add_vpp_config()
 
         gre_if1.admin_up()
         gre_if2.admin_up()
 
-        self.vapi.sw_interface_set_l2_xconnect(gre_if1.sw_if_index,
-                                               gre_if2.sw_if_index,
-                                               enable=1)
-        self.vapi.sw_interface_set_l2_xconnect(gre_if2.sw_if_index,
-                                               gre_if1.sw_if_index,
-                                               enable=1)
+        self.vapi.sw_interface_set_l2_xconnect(
+            gre_if1.sw_if_index, gre_if2.sw_if_index, enable=1
+        )
+        self.vapi.sw_interface_set_l2_xconnect(
+            gre_if2.sw_if_index, gre_if1.sw_if_index, enable=1
+        )
 
         #
         # Send in tunnel encapped L2. expect out tunnel encapped L2
         # in both directions
         #
-        tx = self.create_tunnel_stream_l2o4(self.pg0,
-                                            "2.2.2.2",
-                                            self.pg0.local_ip4)
+        tx = self.create_tunnel_stream_l2o4(self.pg0, "2.2.2.2", self.pg0.local_ip4)
         rx = self.send_and_expect(self.pg0, tx, self.pg0)
-        self.verify_tunneled_l2o4(self.pg0, rx, tx,
-                                  self.pg0.local_ip4,
-                                  "2.2.2.3")
+        self.verify_tunneled_l2o4(self.pg0, rx, tx, self.pg0.local_ip4, "2.2.2.3")
 
-        tx = self.create_tunnel_stream_l2o4(self.pg0,
-                                            "2.2.2.3",
-                                            self.pg0.local_ip4)
+        tx = self.create_tunnel_stream_l2o4(self.pg0, "2.2.2.3", self.pg0.local_ip4)
         rx = self.send_and_expect(self.pg0, tx, self.pg0)
-        self.verify_tunneled_l2o4(self.pg0, rx, tx,
-                                  self.pg0.local_ip4,
-                                  "2.2.2.2")
+        self.verify_tunneled_l2o4(self.pg0, rx, tx, self.pg0.local_ip4, "2.2.2.2")
 
-        self.vapi.sw_interface_set_l2_xconnect(gre_if1.sw_if_index,
-                                               gre_if2.sw_if_index,
-                                               enable=0)
-        self.vapi.sw_interface_set_l2_xconnect(gre_if2.sw_if_index,
-                                               gre_if1.sw_if_index,
-                                               enable=0)
+        self.vapi.sw_interface_set_l2_xconnect(
+            gre_if1.sw_if_index, gre_if2.sw_if_index, enable=0
+        )
+        self.vapi.sw_interface_set_l2_xconnect(
+            gre_if2.sw_if_index, gre_if1.sw_if_index, enable=0
+        )
 
         #
         # Create a VLAN sub-interfaces on the GRE TEB interfaces
@@ -963,47 +998,39 @@ class TestGRE(VppTestCase):
         gre_if_11.admin_up()
         gre_if_12.admin_up()
 
-        self.vapi.sw_interface_set_l2_xconnect(gre_if_11.sw_if_index,
-                                               gre_if_12.sw_if_index,
-                                               enable=1)
-        self.vapi.sw_interface_set_l2_xconnect(gre_if_12.sw_if_index,
-                                               gre_if_11.sw_if_index,
-                                               enable=1)
+        self.vapi.sw_interface_set_l2_xconnect(
+            gre_if_11.sw_if_index, gre_if_12.sw_if_index, enable=1
+        )
+        self.vapi.sw_interface_set_l2_xconnect(
+            gre_if_12.sw_if_index, gre_if_11.sw_if_index, enable=1
+        )
 
         #
         # Configure both to pop thier respective VLAN tags,
         # so that during the x-coonect they will subsequently push
         #
         self.vapi.l2_interface_vlan_tag_rewrite(
-            sw_if_index=gre_if_12.sw_if_index, vtr_op=L2_VTR_OP.L2_POP_1,
-            push_dot1q=12)
+            sw_if_index=gre_if_12.sw_if_index, vtr_op=L2_VTR_OP.L2_POP_1, push_dot1q=12
+        )
         self.vapi.l2_interface_vlan_tag_rewrite(
-            sw_if_index=gre_if_11.sw_if_index, vtr_op=L2_VTR_OP.L2_POP_1,
-            push_dot1q=11)
+            sw_if_index=gre_if_11.sw_if_index, vtr_op=L2_VTR_OP.L2_POP_1, push_dot1q=11
+        )
 
         #
         # Send traffic in both directiond - expect the VLAN tags to
         # be swapped.
         #
-        tx = self.create_tunnel_stream_vlano4(self.pg0,
-                                              "2.2.2.2",
-                                              self.pg0.local_ip4,
-                                              11)
+        tx = self.create_tunnel_stream_vlano4(
+            self.pg0, "2.2.2.2", self.pg0.local_ip4, 11
+        )
         rx = self.send_and_expect(self.pg0, tx, self.pg0)
-        self.verify_tunneled_vlano4(self.pg0, rx, tx,
-                                    self.pg0.local_ip4,
-                                    "2.2.2.3",
-                                    12)
-
-        tx = self.create_tunnel_stream_vlano4(self.pg0,
-                                              "2.2.2.3",
-                                              self.pg0.local_ip4,
-                                              12)
+        self.verify_tunneled_vlano4(self.pg0, rx, tx, self.pg0.local_ip4, "2.2.2.3", 12)
+
+        tx = self.create_tunnel_stream_vlano4(
+            self.pg0, "2.2.2.3", self.pg0.local_ip4, 12
+        )
         rx = self.send_and_expect(self.pg0, tx, self.pg0)
-        self.verify_tunneled_vlano4(self.pg0, rx, tx,
-                                    self.pg0.local_ip4,
-                                    "2.2.2.2",
-                                    11)
+        self.verify_tunneled_vlano4(self.pg0, rx, tx, self.pg0.local_ip4, "2.2.2.2", 11)
 
         #
         # Cleanup Test resources
@@ -1016,16 +1043,14 @@ class TestGRE(VppTestCase):
         route_tun2_dst.add_vpp_config()
 
     def test_gre_loop(self):
-        """ GRE tunnel loop Tests """
+        """GRE tunnel loop Tests"""
 
         #
         # Create an L3 GRE tunnel.
         #  - set it admin up
         #  - assign an IP Addres
         #
-        gre_if = VppGreInterface(self,
-                                 self.pg0.local_ip4,
-                                 "1.1.1.2")
+        gre_if = VppGreInterface(self, self.pg0.local_ip4, "1.1.1.2")
         gre_if.add_vpp_config()
         gre_if.admin_up()
         gre_if.config_ip4()
@@ -1035,9 +1060,9 @@ class TestGRE(VppTestCase):
         # through the tunnel, hence forming a loop in the forwarding
         # graph
         #
-        route_dst = VppIpRoute(self, "1.1.1.2", 32,
-                               [VppRoutePath("0.0.0.0",
-                                             gre_if.sw_if_index)])
+        route_dst = VppIpRoute(
+            self, "1.1.1.2", 32, [VppRoutePath("0.0.0.0", gre_if.sw_if_index)]
+        )
         route_dst.add_vpp_config()
 
         #
@@ -1051,8 +1076,7 @@ class TestGRE(VppTestCase):
         #
         # break the loop
         #
-        route_dst.modify([VppRoutePath(self.pg1.remote_ip4,
-                                       self.pg1.sw_if_index)])
+        route_dst.modify([VppRoutePath(self.pg1.remote_ip4, self.pg1.sw_if_index)])
         route_dst.add_vpp_config()
 
         rx = self.send_and_expect(self.pg0, tx, self.pg1)
@@ -1060,15 +1084,14 @@ class TestGRE(VppTestCase):
         #
         # a good route throught the tunnel to check it restacked
         #
-        route_via_tun_2 = VppIpRoute(self, "2.2.2.2", 32,
-                                     [VppRoutePath("0.0.0.0",
-                                                   gre_if.sw_if_index)])
+        route_via_tun_2 = VppIpRoute(
+            self, "2.2.2.2", 32, [VppRoutePath("0.0.0.0", gre_if.sw_if_index)]
+        )
         route_via_tun_2.add_vpp_config()
 
         tx = self.create_stream_ip4(self.pg0, "2.2.2.3", "2.2.2.2")
         rx = self.send_and_expect(self.pg0, tx, self.pg1)
-        self.verify_tunneled_4o4(self.pg1, rx, tx,
-                                 self.pg0.local_ip4, "1.1.1.2")
+        self.verify_tunneled_4o4(self.pg1, rx, tx, self.pg0.local_ip4, "1.1.1.2")
 
         #
         # cleanup
@@ -1077,7 +1100,7 @@ class TestGRE(VppTestCase):
         gre_if.remove_vpp_config()
 
     def test_mgre(self):
-        """ mGRE IPv4 tunnel Tests """
+        """mGRE IPv4 tunnel Tests"""
 
         for itf in self.pg_interfaces[3:]:
             #
@@ -1092,11 +1115,12 @@ class TestGRE(VppTestCase):
             #  - assign an IP Addres
             #  - Add a route via the tunnel
             #
-            gre_if = VppGreInterface(self,
-                                     itf.local_ip4,
-                                     "0.0.0.0",
-                                     mode=(VppEnum.vl_api_tunnel_mode_t.
-                                           TUNNEL_API_MODE_MP))
+            gre_if = VppGreInterface(
+                self,
+                itf.local_ip4,
+                "0.0.0.0",
+                mode=(VppEnum.vl_api_tunnel_mode_t.TUNNEL_API_MODE_MP),
+            )
             gre_if.add_vpp_config()
             gre_if.admin_up()
             gre_if.config_ip4()
@@ -1109,11 +1133,13 @@ class TestGRE(VppTestCase):
             # ensure we don't match to the tunnel if the source address
             # is all zeros
             #
-            tx = self.create_tunnel_stream_4o4(self.pg0,
-                                               "0.0.0.0",
-                                               itf.local_ip4,
-                                               self.pg0.local_ip4,
-                                               self.pg0.remote_ip4)
+            tx = self.create_tunnel_stream_4o4(
+                self.pg0,
+                "0.0.0.0",
+                itf.local_ip4,
+                self.pg0.local_ip4,
+                self.pg0.remote_ip4,
+            )
             self.send_and_assert_no_replies(self.pg0, tx)
 
             #
@@ -1127,9 +1153,11 @@ class TestGRE(VppTestCase):
                 # route traffic via the peer
                 #
                 route_via_tun = VppIpRoute(
-                    self, route_addr, 32,
-                    [VppRoutePath(gre_if._remote_hosts[ii].ip4,
-                                  gre_if.sw_if_index)])
+                    self,
+                    route_addr,
+                    32,
+                    [VppRoutePath(gre_if._remote_hosts[ii].ip4, gre_if.sw_if_index)],
+                )
                 route_via_tun.add_vpp_config()
 
                 # all packets dropped at this point
@@ -1142,9 +1170,12 @@ class TestGRE(VppTestCase):
                 #
                 # Add a TEIB entry resolves the peer
                 #
-                teib = VppTeib(self, gre_if,
-                               gre_if._remote_hosts[ii].ip4,
-                               itf._remote_hosts[ii].ip4)
+                teib = VppTeib(
+                    self,
+                    gre_if,
+                    gre_if._remote_hosts[ii].ip4,
+                    itf._remote_hosts[ii].ip4,
+                )
                 teib.add_vpp_config()
 
                 #
@@ -1152,15 +1183,17 @@ class TestGRE(VppTestCase):
                 #  - packets are GRE encapped
                 #
                 rx = self.send_and_expect(self.pg0, tx_e, itf)
-                self.verify_tunneled_4o4(self.pg0, rx, tx_e,
-                                         itf.local_ip4,
-                                         itf._remote_hosts[ii].ip4)
-
-                tx_i = self.create_tunnel_stream_4o4(self.pg0,
-                                                     itf._remote_hosts[ii].ip4,
-                                                     itf.local_ip4,
-                                                     self.pg0.local_ip4,
-                                                     self.pg0.remote_ip4)
+                self.verify_tunneled_4o4(
+                    self.pg0, rx, tx_e, itf.local_ip4, itf._remote_hosts[ii].ip4
+                )
+
+                tx_i = self.create_tunnel_stream_4o4(
+                    self.pg0,
+                    itf._remote_hosts[ii].ip4,
+                    itf.local_ip4,
+                    self.pg0.local_ip4,
+                    self.pg0.remote_ip4,
+                )
                 rx = self.send_and_expect(self.pg0, tx_i, self.pg0)
                 self.verify_decapped_4o4(self.pg0, rx, tx_i)
 
@@ -1173,9 +1206,9 @@ class TestGRE(VppTestCase):
 
                 teib.add_vpp_config()
                 rx = self.send_and_expect(self.pg0, tx_e, itf)
-                self.verify_tunneled_4o4(self.pg0, rx, tx_e,
-                                         itf.local_ip4,
-                                         itf._remote_hosts[ii].ip4)
+                self.verify_tunneled_4o4(
+                    self.pg0, rx, tx_e, itf.local_ip4, itf._remote_hosts[ii].ip4
+                )
                 rx = self.send_and_expect(self.pg0, tx_i, self.pg0)
                 self.verify_decapped_4o4(self.pg0, rx, tx_i)
 
@@ -1185,9 +1218,9 @@ class TestGRE(VppTestCase):
                 gre_if.admin_down()
                 gre_if.admin_up()
                 rx = self.send_and_expect(self.pg0, tx_e, itf)
-                self.verify_tunneled_4o4(self.pg0, rx, tx_e,
-                                         itf.local_ip4,
-                                         itf._remote_hosts[ii].ip4)
+                self.verify_tunneled_4o4(
+                    self.pg0, rx, tx_e, itf.local_ip4, itf._remote_hosts[ii].ip4
+                )
                 rx = self.send_and_expect(self.pg0, tx_i, self.pg0)
                 self.verify_decapped_4o4(self.pg0, rx, tx_i)
 
@@ -1195,7 +1228,7 @@ class TestGRE(VppTestCase):
             gre_if.unconfig_ip4()
 
     def test_mgre6(self):
-        """ mGRE IPv6 tunnel Tests """
+        """mGRE IPv6 tunnel Tests"""
 
         self.pg0.config_ip6()
         self.pg0.resolve_ndp()
@@ -1220,9 +1253,9 @@ class TestGRE(VppTestCase):
                 self,
                 itf.local_ip6,
                 "::",
-                mode=(VppEnum.vl_api_tunnel_mode_t.
-                      TUNNEL_API_MODE_MP),
-                flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP)
+                mode=(VppEnum.vl_api_tunnel_mode_t.TUNNEL_API_MODE_MP),
+                flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP,
+            )
 
             gre_if.add_vpp_config()
             gre_if.admin_up()
@@ -1238,36 +1271,43 @@ class TestGRE(VppTestCase):
                 #
                 # Add a TEIB entry resolves the peer
                 #
-                teib = VppTeib(self, gre_if,
-                               gre_if._remote_hosts[ii].ip6,
-                               itf._remote_hosts[ii].ip6)
+                teib = VppTeib(
+                    self,
+                    gre_if,
+                    gre_if._remote_hosts[ii].ip6,
+                    itf._remote_hosts[ii].ip6,
+                )
                 teib.add_vpp_config()
 
                 #
                 # route traffic via the peer
                 #
                 route_via_tun = VppIpRoute(
-                    self, route_addr, 128,
-                    [VppRoutePath(gre_if._remote_hosts[ii].ip6,
-                                  gre_if.sw_if_index)])
+                    self,
+                    route_addr,
+                    128,
+                    [VppRoutePath(gre_if._remote_hosts[ii].ip6, gre_if.sw_if_index)],
+                )
                 route_via_tun.add_vpp_config()
 
                 #
                 # Send a packet stream that is routed into the tunnel
                 #  - packets are GRE encapped
                 #
-                tx_e = self.create_stream_ip6(self.pg0, "5::5", route_addr,
-                                              dscp=2, ecn=1)
+                tx_e = self.create_stream_ip6(
+                    self.pg0, "5::5", route_addr, dscp=2, ecn=1
+                )
                 rx = self.send_and_expect(self.pg0, tx_e, itf)
-                self.verify_tunneled_6o6(self.pg0, rx, tx_e,
-                                         itf.local_ip6,
-                                         itf._remote_hosts[ii].ip6,
-                                         dscp=2)
-                tx_i = self.create_tunnel_stream_6o6(self.pg0,
-                                                     itf._remote_hosts[ii].ip6,
-                                                     itf.local_ip6,
-                                                     self.pg0.local_ip6,
-                                                     self.pg0.remote_ip6)
+                self.verify_tunneled_6o6(
+                    self.pg0, rx, tx_e, itf.local_ip6, itf._remote_hosts[ii].ip6, dscp=2
+                )
+                tx_i = self.create_tunnel_stream_6o6(
+                    self.pg0,
+                    itf._remote_hosts[ii].ip6,
+                    itf.local_ip6,
+                    self.pg0.local_ip6,
+                    self.pg0.remote_ip6,
+                )
                 rx = self.send_and_expect(self.pg0, tx_i, self.pg0)
                 self.verify_decapped_6o6(self.pg0, rx, tx_i)
 
@@ -1279,10 +1319,9 @@ class TestGRE(VppTestCase):
 
                 teib.add_vpp_config()
                 rx = self.send_and_expect(self.pg0, tx_e, itf)
-                self.verify_tunneled_6o6(self.pg0, rx, tx_e,
-                                         itf.local_ip6,
-                                         itf._remote_hosts[ii].ip6,
-                                         dscp=2)
+                self.verify_tunneled_6o6(
+                    self.pg0, rx, tx_e, itf.local_ip6, itf._remote_hosts[ii].ip6, dscp=2
+                )
                 rx = self.send_and_expect(self.pg0, tx_i, self.pg0)
                 self.verify_decapped_6o6(self.pg0, rx, tx_i)
 
@@ -1292,5 +1331,5 @@ class TestGRE(VppTestCase):
         self.pg0.unconfig_ip6()
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     unittest.main(testRunner=VppTestRunner)