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, 492 insertions, 374 deletions

diff --git a/test/test_ipip.py b/test/test_ipip.py
index b1ea57d7e12..cbaedd51273 100644
--- a/test/test_ipip.py
+++ b/test/test_ipip.py
@@ -7,8 +7,15 @@ from scapy.contrib.mpls import MPLS
 from scapy.all import fragment, fragment6, RandShort, defragment6
 from framework import VppTestCase, VppTestRunner
 from vpp_ip import DpoProto
-from vpp_ip_route import VppIpRoute, VppRoutePath, VppIpTable, FibPathProto, \
-    VppMplsLabel, VppMplsRoute, VppMplsTable
+from vpp_ip_route import (
+    VppIpRoute,
+    VppRoutePath,
+    VppIpTable,
+    FibPathProto,
+    VppMplsLabel,
+    VppMplsRoute,
+    VppMplsTable,
+)
 from vpp_ipip_tun_interface import VppIpIpTunInterface
 from vpp_teib import VppTeib
 from vpp_papi import VppEnum
@@ -22,27 +29,27 @@ IPIP tests.
 """
 
 
-def ipip_add_tunnel(test, src, dst, table_id=0, dscp=0x0,
-                    flags=0):
-    """ Add a IPIP tunnel """
+def ipip_add_tunnel(test, src, dst, table_id=0, dscp=0x0, flags=0):
+    """Add a IPIP tunnel"""
     return test.vapi.ipip_add_tunnel(
         tunnel={
-            'src': src,
-            'dst': dst,
-            'table_id': table_id,
-            'instance': 0xffffffff,
-            'dscp': dscp,
-            'flags': flags
+            "src": src,
+            "dst": dst,
+            "table_id": table_id,
+            "instance": 0xFFFFFFFF,
+            "dscp": dscp,
+            "flags": flags,
         }
     )
 
+
 # the number of packets to send when injecting traffic.
 # a multiple of 8 minus one, so we test all by 8/4/2/1 loops
 N_PACKETS = 64 - 1
 
 
 class TestIPIP(VppTestCase):
-    """ IPIP Test Case """
+    """IPIP Test Case"""
 
     @classmethod
     def setUpClass(cls):
@@ -88,21 +95,24 @@ class TestIPIP(VppTestCase):
         p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
         p_payload = UDP(sport=1234, dport=1234) / self.payload(payload_length)
         p_ip4 = IP(src="1.2.3.4", dst=self.pg0.remote_ip4)
-        outer_ip4 = (p_ether / IP(src=self.pg1.remote_ip4,
-                                  id=RandShort(),
-                                  dst=self.pg0.local_ip4) / p_ip4 / p_payload)
+        outer_ip4 = (
+            p_ether
+            / IP(src=self.pg1.remote_ip4, id=RandShort(), dst=self.pg0.local_ip4)
+            / p_ip4
+            / p_payload
+        )
         frags = fragment(outer_ip4, fragment_size)
-        p4_reply = (p_ip4 / p_payload)
+        p4_reply = p_ip4 / p_payload
         p4_reply.ttl -= 1
         return frags, p4_reply
 
     def verify_ip4ip4_encaps(self, a, p_ip4s, p_ip4_encaps):
         for i, p_ip4 in enumerate(p_ip4s):
             p_ip4.dst = a
-            p4 = (self.p_ether / p_ip4 / self.p_payload)
+            p4 = self.p_ether / p_ip4 / self.p_payload
             p_ip4_inner = p_ip4
             p_ip4_inner.ttl -= 1
-            p4_reply = (p_ip4_encaps[i] / p_ip4_inner / self.p_payload)
+            p4_reply = p_ip4_encaps[i] / p_ip4_inner / self.p_payload
             p4_reply.ttl -= 1
             p4_reply.id = 0
             rx = self.send_and_expect(self.pg0, p4 * N_PACKETS, self.pg1)
@@ -113,10 +123,10 @@ class TestIPIP(VppTestCase):
     def verify_ip6ip4_encaps(self, a, p_ip6s, p_ip4_encaps):
         for i, p_ip6 in enumerate(p_ip6s):
             p_ip6.dst = a
-            p6 = (self.p_ether / p_ip6 / self.p_payload)
+            p6 = self.p_ether / p_ip6 / self.p_payload
             p_inner_ip6 = p_ip6
             p_inner_ip6.hlim -= 1
-            p6_reply = (p_ip4_encaps[i] / p_inner_ip6 / self.p_payload)
+            p6_reply = p_ip4_encaps[i] / p_inner_ip6 / self.p_payload
             p6_reply.ttl -= 1
             rx = self.send_and_expect(self.pg0, p6 * N_PACKETS, self.pg1)
             for p in rx:
@@ -124,14 +134,14 @@ class TestIPIP(VppTestCase):
                 self.assert_packet_checksums_valid(p)
 
     def test_ipip4(self):
-        """ ip{v4,v6} over ip4 test """
+        """ip{v4,v6} over ip4 test"""
 
         self.pg1.generate_remote_hosts(5)
         self.pg1.configure_ipv4_neighbors()
         e = VppEnum.vl_api_tunnel_encap_decap_flags_t
         d = VppEnum.vl_api_ip_dscp_t
         self.p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
-        self.p_payload = UDP(sport=1234, dport=1234) / Raw(b'X' * 100)
+        self.p_payload = UDP(sport=1234, dport=1234) / Raw(b"X" * 100)
 
         # create a TOS byte by shifting a DSCP code point 2 bits. those 2 bits
         # are for the ECN.
@@ -145,7 +155,8 @@ class TestIPIP(VppTestCase):
             self.pg0,
             self.pg0.local_ip4,
             self.pg1.remote_hosts[0].ip4,
-            flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP)
+            flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP,
+        )
         tun_dscp.add_vpp_config()
         # IPv4 transport that copies the DCSP and ECN from the payload
         tun_dscp_ecn = VppIpIpTunInterface(
@@ -153,8 +164,11 @@ class TestIPIP(VppTestCase):
             self.pg0,
             self.pg0.local_ip4,
             self.pg1.remote_hosts[1].ip4,
-            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
+            ),
+        )
         tun_dscp_ecn.add_vpp_config()
         # IPv4 transport that copies the ECN from the payload and sets the
         # DF bit on encap. copies the ECN on decap
@@ -163,9 +177,12 @@ class TestIPIP(VppTestCase):
             self.pg0,
             self.pg0.local_ip4,
             self.pg1.remote_hosts[2].ip4,
-            flags=(e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN |
-                   e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_SET_DF |
-                   e.TUNNEL_API_ENCAP_DECAP_FLAG_DECAP_COPY_ECN))
+            flags=(
+                e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN
+                | e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_SET_DF
+                | e.TUNNEL_API_ENCAP_DECAP_FLAG_DECAP_COPY_ECN
+            ),
+        )
         tun_ecn.add_vpp_config()
         # IPv4 transport that sets a fixed DSCP in the encap and copies
         # the DF bit
@@ -175,7 +192,8 @@ class TestIPIP(VppTestCase):
             self.pg0.local_ip4,
             self.pg1.remote_hosts[3].ip4,
             dscp=d.IP_API_DSCP_AF11,
-            flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DF)
+            flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DF,
+        )
         tun.add_vpp_config()
 
         # array of all the tunnels
@@ -186,22 +204,26 @@ class TestIPIP(VppTestCase):
         a6s = ["" for i in range(len(tuns))]
 
         # IP headers with each combination of DSCp/ECN tested
-        p_ip6s = [IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=dscp),
-                  IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=dscp_ecn),
-                  IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=ecn),
-                  IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=0xff)]
-        p_ip4s = [IP(src="1.2.3.4", dst="130.67.0.1", tos=dscp, flags='DF'),
-                  IP(src="1.2.3.4", dst="130.67.0.1", tos=dscp_ecn),
-                  IP(src="1.2.3.4", dst="130.67.0.1", tos=ecn),
-                  IP(src="1.2.3.4", dst="130.67.0.1", tos=0xff)]
+        p_ip6s = [
+            IPv6(src="1::1", dst="DEAD::1", nh="UDP", tc=dscp),
+            IPv6(src="1::1", dst="DEAD::1", nh="UDP", tc=dscp_ecn),
+            IPv6(src="1::1", dst="DEAD::1", nh="UDP", tc=ecn),
+            IPv6(src="1::1", dst="DEAD::1", nh="UDP", tc=0xFF),
+        ]
+        p_ip4s = [
+            IP(src="1.2.3.4", dst="130.67.0.1", tos=dscp, flags="DF"),
+            IP(src="1.2.3.4", dst="130.67.0.1", tos=dscp_ecn),
+            IP(src="1.2.3.4", dst="130.67.0.1", tos=ecn),
+            IP(src="1.2.3.4", dst="130.67.0.1", tos=0xFF),
+        ]
 
         # Configure each tunnel
         for i, t in enumerate(tuns):
             # Set interface up and enable IP on it
             self.vapi.sw_interface_set_flags(t.sw_if_index, 1)
             self.vapi.sw_interface_set_unnumbered(
-                sw_if_index=self.pg0.sw_if_index,
-                unnumbered_sw_if_index=t.sw_if_index)
+                sw_if_index=self.pg0.sw_if_index, unnumbered_sw_if_index=t.sw_if_index
+            )
 
             # prefix for route / destination address for packets
             a4s[i] = "130.67.%d.0" % i
@@ -209,17 +231,29 @@ class TestIPIP(VppTestCase):
 
             # Add IPv4 and IPv6 routes via tunnel interface
             ip4_via_tunnel = VppIpRoute(
-                self, a4s[i], 24,
-                [VppRoutePath("0.0.0.0",
-                              t.sw_if_index,
-                              proto=FibPathProto.FIB_PATH_NH_PROTO_IP4)])
+                self,
+                a4s[i],
+                24,
+                [
+                    VppRoutePath(
+                        "0.0.0.0",
+                        t.sw_if_index,
+                        proto=FibPathProto.FIB_PATH_NH_PROTO_IP4,
+                    )
+                ],
+            )
             ip4_via_tunnel.add_vpp_config()
 
             ip6_via_tunnel = VppIpRoute(
-                self, a6s[i], 64,
-                [VppRoutePath("::",
-                              t.sw_if_index,
-                              proto=FibPathProto.FIB_PATH_NH_PROTO_IP6)])
+                self,
+                a6s[i],
+                64,
+                [
+                    VppRoutePath(
+                        "::", t.sw_if_index, proto=FibPathProto.FIB_PATH_NH_PROTO_IP6
+                    )
+                ],
+            )
             ip6_via_tunnel.add_vpp_config()
 
         #
@@ -229,13 +263,14 @@ class TestIPIP(VppTestCase):
         # tun_dscp copies only the dscp
         # expected TC values are thus only the DCSP value is present from the
         # inner
-        exp_tcs = [dscp, dscp, 0, 0xfc]
-        p_ip44_encaps = [IP(src=self.pg0.local_ip4,
-                            dst=tun_dscp.dst,
-                            tos=tc) for tc in exp_tcs]
-        p_ip64_encaps = [IP(src=self.pg0.local_ip4,
-                            dst=tun_dscp.dst,
-                            proto='ipv6', id=0, tos=tc) for tc in exp_tcs]
+        exp_tcs = [dscp, dscp, 0, 0xFC]
+        p_ip44_encaps = [
+            IP(src=self.pg0.local_ip4, dst=tun_dscp.dst, tos=tc) for tc in exp_tcs
+        ]
+        p_ip64_encaps = [
+            IP(src=self.pg0.local_ip4, dst=tun_dscp.dst, proto="ipv6", id=0, tos=tc)
+            for tc in exp_tcs
+        ]
 
         # IPv4 in to IPv4 tunnel
         self.verify_ip4ip4_encaps(a4s[0], p_ip4s, p_ip44_encaps)
@@ -243,41 +278,50 @@ class TestIPIP(VppTestCase):
         self.verify_ip6ip4_encaps(a6s[0], p_ip6s, p_ip64_encaps)
 
         # tun_dscp_ecn copies the dscp and the ecn
-        exp_tcs = [dscp, dscp_ecn, ecn, 0xff]
-        p_ip44_encaps = [IP(src=self.pg0.local_ip4,
-                            dst=tun_dscp_ecn.dst,
-                            tos=tc) for tc in exp_tcs]
-        p_ip64_encaps = [IP(src=self.pg0.local_ip4,
-                            dst=tun_dscp_ecn.dst,
-                            proto='ipv6', id=0, tos=tc) for tc in exp_tcs]
+        exp_tcs = [dscp, dscp_ecn, ecn, 0xFF]
+        p_ip44_encaps = [
+            IP(src=self.pg0.local_ip4, dst=tun_dscp_ecn.dst, tos=tc) for tc in exp_tcs
+        ]
+        p_ip64_encaps = [
+            IP(src=self.pg0.local_ip4, dst=tun_dscp_ecn.dst, proto="ipv6", id=0, tos=tc)
+            for tc in exp_tcs
+        ]
 
         self.verify_ip4ip4_encaps(a4s[1], p_ip4s, p_ip44_encaps)
         self.verify_ip6ip4_encaps(a6s[1], p_ip6s, p_ip64_encaps)
 
         # tun_ecn copies only the ecn and always sets DF
         exp_tcs = [0, ecn, ecn, ecn]
-        p_ip44_encaps = [IP(src=self.pg0.local_ip4,
-                            dst=tun_ecn.dst,
-                            flags='DF', tos=tc) for tc in exp_tcs]
-        p_ip64_encaps = [IP(src=self.pg0.local_ip4,
-                            dst=tun_ecn.dst,
-                            flags='DF', proto='ipv6', id=0, tos=tc)
-                         for tc in exp_tcs]
+        p_ip44_encaps = [
+            IP(src=self.pg0.local_ip4, dst=tun_ecn.dst, flags="DF", tos=tc)
+            for tc in exp_tcs
+        ]
+        p_ip64_encaps = [
+            IP(
+                src=self.pg0.local_ip4,
+                dst=tun_ecn.dst,
+                flags="DF",
+                proto="ipv6",
+                id=0,
+                tos=tc,
+            )
+            for tc in exp_tcs
+        ]
 
         self.verify_ip4ip4_encaps(a4s[2], p_ip4s, p_ip44_encaps)
         self.verify_ip6ip4_encaps(a6s[2], p_ip6s, p_ip64_encaps)
 
         # tun sets a fixed dscp and copies DF
         fixed_dscp = tun.dscp << 2
-        flags = ['DF', 0, 0, 0]
-        p_ip44_encaps = [IP(src=self.pg0.local_ip4,
-                            dst=tun.dst,
-                            flags=f,
-                            tos=fixed_dscp) for f in flags]
-        p_ip64_encaps = [IP(src=self.pg0.local_ip4,
-                            dst=tun.dst,
-                            proto='ipv6', id=0,
-                            tos=fixed_dscp) for i in range(len(p_ip4s))]
+        flags = ["DF", 0, 0, 0]
+        p_ip44_encaps = [
+            IP(src=self.pg0.local_ip4, dst=tun.dst, flags=f, tos=fixed_dscp)
+            for f in flags
+        ]
+        p_ip64_encaps = [
+            IP(src=self.pg0.local_ip4, dst=tun.dst, proto="ipv6", id=0, tos=fixed_dscp)
+            for i in range(len(p_ip4s))
+        ]
 
         self.verify_ip4ip4_encaps(a4s[3], p_ip4s, p_ip44_encaps)
         self.verify_ip6ip4_encaps(a6s[3], p_ip6s, p_ip64_encaps)
@@ -293,15 +337,13 @@ class TestIPIP(VppTestCase):
 
         # one overlay packet and all combinations of its encap
         p_ip4 = IP(src="1.2.3.4", dst=self.pg0.remote_ip4)
-        p_ip4_encaps = [IP(src=tun.dst,
-                           dst=self.pg0.local_ip4,
-                           tos=tc) for tc in tcs]
+        p_ip4_encaps = [IP(src=tun.dst, dst=self.pg0.local_ip4, tos=tc) for tc in tcs]
 
         # for each encap tun will produce the same inner packet because it does
         # not copy up fields from the payload
         for p_ip4_encap in p_ip4_encaps:
-            p4 = (self.p_ether / p_ip4_encap / p_ip4 / self.p_payload)
-            p4_reply = (p_ip4 / self.p_payload)
+            p4 = self.p_ether / p_ip4_encap / p_ip4 / self.p_payload
+            p4_reply = p_ip4 / self.p_payload
             p4_reply.ttl -= 1
             rx = self.send_and_expect(self.pg1, p4 * N_PACKETS, self.pg0)
             n_packets_decapped += N_PACKETS
@@ -309,20 +351,19 @@ class TestIPIP(VppTestCase):
                 self.validate(p[1], p4_reply)
                 self.assert_packet_checksums_valid(p)
 
-        err = self.statistics.get_err_counter(
-            '/err/ipip4-input/packets decapsulated')
+        err = self.statistics.get_err_counter("/err/ipip4-input/packets decapsulated")
         self.assertEqual(err, n_packets_decapped)
 
         # tun_ecn copies the ECN bits from the encap to the inner
-        p_ip4_encaps = [IP(src=tun_ecn.dst,
-                           dst=self.pg0.local_ip4,
-                           tos=tc) for tc in tcs]
+        p_ip4_encaps = [
+            IP(src=tun_ecn.dst, dst=self.pg0.local_ip4, tos=tc) for tc in tcs
+        ]
         p_ip4_replys = [p_ip4.copy() for i in range(len(p_ip4_encaps))]
         p_ip4_replys[2].tos = ecn
         p_ip4_replys[3].tos = ecn
         for i, p_ip4_encap in enumerate(p_ip4_encaps):
-            p4 = (self.p_ether / p_ip4_encap / p_ip4 / self.p_payload)
-            p4_reply = (p_ip4_replys[i] / self.p_payload)
+            p4 = self.p_ether / p_ip4_encap / p_ip4 / self.p_payload
+            p4_reply = p_ip4_replys[i] / self.p_payload
             p4_reply.ttl -= 1
             rx = self.send_and_expect(self.pg1, p4 * N_PACKETS, self.pg0)
             n_packets_decapped += N_PACKETS
@@ -330,22 +371,17 @@ class TestIPIP(VppTestCase):
                 self.validate(p[1], p4_reply)
                 self.assert_packet_checksums_valid(p)
 
-        err = self.statistics.get_err_counter(
-            '/err/ipip4-input/packets decapsulated')
+        err = self.statistics.get_err_counter("/err/ipip4-input/packets decapsulated")
         self.assertEqual(err, n_packets_decapped)
 
         # IPv4 tunnel to IPv6
         # for each encap tun will produce the same inner packet because it does
         # not copy up fields from the payload
-        p_ip4_encaps = [IP(src=tun.dst,
-                           dst=self.pg0.local_ip4,
-                           tos=tc) for tc in tcs]
+        p_ip4_encaps = [IP(src=tun.dst, dst=self.pg0.local_ip4, tos=tc) for tc in tcs]
         p_ip6 = IPv6(src="1:2:3::4", dst=self.pg0.remote_ip6)
         for p_ip4_encap in p_ip4_encaps:
-            p6 = (self.p_ether /
-                  p_ip4_encap / p_ip6 /
-                  self.p_payload)
-            p6_reply = (p_ip6 / self.p_payload)
+            p6 = self.p_ether / p_ip4_encap / p_ip6 / self.p_payload
+            p6_reply = p_ip6 / self.p_payload
             p6_reply.hlim = 63
             rx = self.send_and_expect(self.pg1, p6 * N_PACKETS, self.pg0)
             n_packets_decapped += N_PACKETS
@@ -353,22 +389,21 @@ class TestIPIP(VppTestCase):
                 self.validate(p[1], p6_reply)
                 self.assert_packet_checksums_valid(p)
 
-        err = self.statistics.get_err_counter(
-            '/err/ipip4-input/packets decapsulated')
+        err = self.statistics.get_err_counter("/err/ipip4-input/packets decapsulated")
         self.assertEqual(err, n_packets_decapped)
 
         # IPv4 tunnel to IPv6
         # tun_ecn copies the ECN bits from the encap to the inner
-        p_ip4_encaps = [IP(src=tun_ecn.dst,
-                           dst=self.pg0.local_ip4,
-                           tos=tc) for tc in tcs]
+        p_ip4_encaps = [
+            IP(src=tun_ecn.dst, dst=self.pg0.local_ip4, tos=tc) for tc in tcs
+        ]
         p_ip6 = IPv6(src="1:2:3::4", dst=self.pg0.remote_ip6)
         p_ip6_replys = [p_ip6.copy() for i in range(len(p_ip4_encaps))]
         p_ip6_replys[2].tc = ecn
         p_ip6_replys[3].tc = ecn
         for i, p_ip4_encap in enumerate(p_ip4_encaps):
-            p6 = (self.p_ether / p_ip4_encap / p_ip6 / self.p_payload)
-            p6_reply = (p_ip6_replys[i] / self.p_payload)
+            p6 = self.p_ether / p_ip4_encap / p_ip6 / self.p_payload
+            p6_reply = p_ip6_replys[i] / self.p_payload
             p6_reply.hlim = 63
             rx = self.send_and_expect(self.pg1, p6 * N_PACKETS, self.pg0)
             n_packets_decapped += N_PACKETS
@@ -376,21 +411,23 @@ class TestIPIP(VppTestCase):
                 self.validate(p[1], p6_reply)
                 self.assert_packet_checksums_valid(p)
 
-        err = self.statistics.get_err_counter(
-            '/err/ipip4-input/packets decapsulated')
+        err = self.statistics.get_err_counter("/err/ipip4-input/packets decapsulated")
         self.assertEqual(err, n_packets_decapped)
 
         #
         # Fragmentation / Reassembly and Re-fragmentation
         #
         rv = self.vapi.ip_reassembly_enable_disable(
-            sw_if_index=self.pg1.sw_if_index,
-            enable_ip4=1)
+            sw_if_index=self.pg1.sw_if_index, enable_ip4=1
+        )
 
-        self.vapi.ip_reassembly_set(timeout_ms=1000, max_reassemblies=1000,
-                                    max_reassembly_length=1000,
-                                    expire_walk_interval_ms=10000,
-                                    is_ip6=0)
+        self.vapi.ip_reassembly_set(
+            timeout_ms=1000,
+            max_reassemblies=1000,
+            max_reassembly_length=1000,
+            expire_walk_interval_ms=10000,
+            is_ip6=0,
+        )
 
         # Send lots of fragments, verify reassembled packet
         frags, p4_reply = self.generate_ip4_frags(3131, 1400)
@@ -406,8 +443,7 @@ class TestIPIP(VppTestCase):
         for p in rx:
             self.validate(p[1], p4_reply)
 
-        err = self.statistics.get_err_counter(
-            '/err/ipip4-input/packets decapsulated')
+        err = self.statistics.get_err_counter("/err/ipip4-input/packets decapsulated")
         self.assertEqual(err, n_packets_decapped)
 
         f = []
@@ -453,9 +489,12 @@ class TestIPIP(VppTestCase):
         # send large packets through the tunnel, expect them to be fragmented
         self.vapi.sw_interface_set_mtu(tun_dscp.sw_if_index, [600, 0, 0, 0])
 
-        p4 = (Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac) /
-              IP(src="1.2.3.4", dst="130.67.0.1", tos=42) /
-              UDP(sport=1234, dport=1234) / Raw(b'Q' * 1000))
+        p4 = (
+            Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
+            / IP(src="1.2.3.4", dst="130.67.0.1", tos=42)
+            / UDP(sport=1234, dport=1234)
+            / Raw(b"Q" * 1000)
+        )
         rx = self.send_and_expect(self.pg0, p4 * 15, self.pg1, 30)
         inners = []
         for p in rx:
@@ -466,25 +505,25 @@ class TestIPIP(VppTestCase):
             self.assertEqual(p[IP].ttl, 63)
 
     def test_ipip_create(self):
-        """ ipip create / delete interface test """
-        rv = ipip_add_tunnel(self, '1.2.3.4', '2.3.4.5')
+        """ipip create / delete interface test"""
+        rv = ipip_add_tunnel(self, "1.2.3.4", "2.3.4.5")
         sw_if_index = rv.sw_if_index
         self.vapi.ipip_del_tunnel(sw_if_index)
 
     def test_ipip_vrf_create(self):
-        """ ipip create / delete interface VRF test """
+        """ipip create / delete interface VRF test"""
 
         t = VppIpTable(self, 20)
         t.add_vpp_config()
-        rv = ipip_add_tunnel(self, '1.2.3.4', '2.3.4.5', table_id=20)
+        rv = ipip_add_tunnel(self, "1.2.3.4", "2.3.4.5", table_id=20)
         sw_if_index = rv.sw_if_index
         self.vapi.ipip_del_tunnel(sw_if_index)
 
     def payload(self, len):
-        return 'x' * len
+        return "x" * len
 
     def test_mipip4(self):
-        """ p2mp IPv4 tunnel Tests """
+        """p2mp IPv4 tunnel Tests"""
 
         for itf in self.pg_interfaces[:2]:
             #
@@ -499,11 +538,13 @@ class TestIPIP(VppTestCase):
             #  - assign an IP Addres
             #  - Add a route via the tunnel
             #
-            ipip_if = VppIpIpTunInterface(self, itf,
-                                          itf.local_ip4,
-                                          "0.0.0.0",
-                                          mode=(VppEnum.vl_api_tunnel_mode_t.
-                                                TUNNEL_API_MODE_MP))
+            ipip_if = VppIpIpTunInterface(
+                self,
+                itf,
+                itf.local_ip4,
+                "0.0.0.0",
+                mode=(VppEnum.vl_api_tunnel_mode_t.TUNNEL_API_MODE_MP),
+            )
             ipip_if.add_vpp_config()
             ipip_if.admin_up()
             ipip_if.config_ip4()
@@ -533,31 +574,40 @@ class TestIPIP(VppTestCase):
                 # route traffic via the peer
                 #
                 route_via_tun = VppIpRoute(
-                    self, route_addr, 32,
-                    [VppRoutePath(ipip_if._remote_hosts[ii].ip4,
-                                  ipip_if.sw_if_index)])
+                    self,
+                    route_addr,
+                    32,
+                    [VppRoutePath(ipip_if._remote_hosts[ii].ip4, ipip_if.sw_if_index)],
+                )
                 route_via_tun.add_vpp_config()
 
                 #
                 # Add a TEIB entry resolves the peer
                 #
-                teib = VppTeib(self, ipip_if,
-                               ipip_if._remote_hosts[ii].ip4,
-                               itf._remote_hosts[ii].ip4)
+                teib = VppTeib(
+                    self,
+                    ipip_if,
+                    ipip_if._remote_hosts[ii].ip4,
+                    itf._remote_hosts[ii].ip4,
+                )
                 teib.add_vpp_config()
-                self.logger.info(self.vapi.cli("sh adj nbr ipip0 %s" %
-                                               ipip_if._remote_hosts[ii].ip4))
+                self.logger.info(
+                    self.vapi.cli("sh adj nbr ipip0 %s" % ipip_if._remote_hosts[ii].ip4)
+                )
 
                 #
                 # Send a packet stream that is routed into the tunnel
                 #  - packets are IPIP encapped
                 #
-                inner = (IP(dst=route_addr, src="5.5.5.5") /
-                         UDP(sport=1234, dport=1234) /
-                         Raw(b'0x44' * 100))
-                tx_e = [(Ether(dst=self.pg0.local_mac,
-                               src=self.pg0.remote_mac) /
-                         inner) for x in range(63)]
+                inner = (
+                    IP(dst=route_addr, src="5.5.5.5")
+                    / UDP(sport=1234, dport=1234)
+                    / Raw(b"0x44" * 100)
+                )
+                tx_e = [
+                    (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / inner)
+                    for x in range(63)
+                ]
 
                 rxs = self.send_and_expect(self.pg0, tx_e, itf)
 
@@ -565,13 +615,16 @@ class TestIPIP(VppTestCase):
                     self.assertEqual(rx[IP].src, itf.local_ip4)
                     self.assertEqual(rx[IP].dst, itf._remote_hosts[ii].ip4)
 
-                tx_i = [(Ether(dst=self.pg0.local_mac,
-                               src=self.pg0.remote_mac) /
-                         IP(src=itf._remote_hosts[ii].ip4,
-                            dst=itf.local_ip4) /
-                         IP(src=self.pg0.local_ip4, dst=self.pg0.remote_ip4) /
-                         UDP(sport=1234, dport=1234) /
-                         Raw(b'0x44' * 100)) for x in range(63)]
+                tx_i = [
+                    (
+                        Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+                        / IP(src=itf._remote_hosts[ii].ip4, dst=itf.local_ip4)
+                        / IP(src=self.pg0.local_ip4, dst=self.pg0.remote_ip4)
+                        / UDP(sport=1234, dport=1234)
+                        / Raw(b"0x44" * 100)
+                    )
+                    for x in range(63)
+                ]
 
                 self.logger.info(self.vapi.cli("sh ipip tunnel-hash"))
                 rx = self.send_and_expect(self.pg0, tx_i, self.pg0)
@@ -593,12 +646,15 @@ class TestIPIP(VppTestCase):
                 #
                 # we can also send to the peer's address
                 #
-                inner = (IP(dst=teib.peer, src="5.5.5.5") /
-                         UDP(sport=1234, dport=1234) /
-                         Raw(b'0x44' * 100))
-                tx_e = [(Ether(dst=self.pg0.local_mac,
-                               src=self.pg0.remote_mac) /
-                         inner) for x in range(63)]
+                inner = (
+                    IP(dst=teib.peer, src="5.5.5.5")
+                    / UDP(sport=1234, dport=1234)
+                    / Raw(b"0x44" * 100)
+                )
+                tx_e = [
+                    (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / inner)
+                    for x in range(63)
+                ]
 
                 rxs = self.send_and_expect(self.pg0, tx_e, itf)
 
@@ -616,12 +672,15 @@ class TestIPIP(VppTestCase):
             #
             # we should still be able to reach the peers from the new table
             #
-            inner = (IP(dst=teib.peer, src="5.5.5.5") /
-                     UDP(sport=1234, dport=1234) /
-                     Raw(b'0x44' * 100))
-            tx_e = [(Ether(dst=self.pg0.local_mac,
-                           src=self.pg0.remote_mac) /
-                     inner) for x in range(63)]
+            inner = (
+                IP(dst=teib.peer, src="5.5.5.5")
+                / UDP(sport=1234, dport=1234)
+                / Raw(b"0x44" * 100)
+            )
+            tx_e = [
+                (Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac) / inner)
+                for x in range(63)
+            ]
 
             rxs = self.send_and_expect(self.pg2, tx_e, itf)
 
@@ -631,7 +690,7 @@ class TestIPIP(VppTestCase):
 
 
 class TestIPIP6(VppTestCase):
-    """ IPIP6 Test Case """
+    """IPIP6 Test Case"""
 
     @classmethod
     def setUpClass(cls):
@@ -665,30 +724,34 @@ class TestIPIP6(VppTestCase):
 
     def setup_tunnel(self):
         # IPv6 transport
-        rv = ipip_add_tunnel(self,
-                             self.pg0.local_ip6,
-                             self.pg1.remote_ip6)
+        rv = ipip_add_tunnel(self, self.pg0.local_ip6, self.pg1.remote_ip6)
 
         sw_if_index = rv.sw_if_index
         self.tunnel_if_index = sw_if_index
         self.vapi.sw_interface_set_flags(sw_if_index, 1)
         self.vapi.sw_interface_set_unnumbered(
-            sw_if_index=self.pg0.sw_if_index,
-            unnumbered_sw_if_index=sw_if_index)
+            sw_if_index=self.pg0.sw_if_index, unnumbered_sw_if_index=sw_if_index
+        )
 
         # Add IPv4 and IPv6 routes via tunnel interface
         ip4_via_tunnel = VppIpRoute(
-            self, "130.67.0.0", 16,
-            [VppRoutePath("0.0.0.0",
-                          sw_if_index,
-                          proto=FibPathProto.FIB_PATH_NH_PROTO_IP4)])
+            self,
+            "130.67.0.0",
+            16,
+            [
+                VppRoutePath(
+                    "0.0.0.0", sw_if_index, proto=FibPathProto.FIB_PATH_NH_PROTO_IP4
+                )
+            ],
+        )
         ip4_via_tunnel.add_vpp_config()
 
         ip6_via_tunnel = VppIpRoute(
-            self, "dead::", 16,
-            [VppRoutePath("::",
-                          sw_if_index,
-                          proto=FibPathProto.FIB_PATH_NH_PROTO_IP6)])
+            self,
+            "dead::",
+            16,
+            [VppRoutePath("::", sw_if_index, proto=FibPathProto.FIB_PATH_NH_PROTO_IP6)],
+        )
         ip6_via_tunnel.add_vpp_config()
 
         self.tunnel_ip6_via_tunnel = ip6_via_tunnel
@@ -708,11 +771,15 @@ class TestIPIP6(VppTestCase):
         p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
         p_payload = UDP(sport=1234, dport=1234) / self.payload(payload_length)
         p_ip6 = IPv6(src="1::1", dst=self.pg0.remote_ip6)
-        outer_ip6 = (p_ether / IPv6(src=self.pg1.remote_ip6,
-                                    dst=self.pg0.local_ip6) /
-                     IPv6ExtHdrFragment() / p_ip6 / p_payload)
+        outer_ip6 = (
+            p_ether
+            / IPv6(src=self.pg1.remote_ip6, dst=self.pg0.local_ip6)
+            / IPv6ExtHdrFragment()
+            / p_ip6
+            / p_payload
+        )
         frags = fragment6(outer_ip6, fragment_size)
-        p6_reply = (p_ip6 / p_payload)
+        p6_reply = p_ip6 / p_payload
         p6_reply.hlim -= 1
         return frags, p6_reply
 
@@ -720,58 +787,73 @@ class TestIPIP6(VppTestCase):
         p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
         p_payload = UDP(sport=1234, dport=1234) / self.payload(payload_length)
         p_ip6 = IPv6(src="1::1", dst="dead::1")
-        outer_ip6 = (p_ether / IPv6(src=self.pg1.remote_ip6,
-                                    dst=self.pg0.local_ip6) /
-                     IPv6ExtHdrFragment() / p_ip6 / p_payload)
+        outer_ip6 = (
+            p_ether
+            / IPv6(src=self.pg1.remote_ip6, dst=self.pg0.local_ip6)
+            / IPv6ExtHdrFragment()
+            / p_ip6
+            / p_payload
+        )
         frags = fragment6(outer_ip6, fragment_size)
         p_ip6.hlim -= 1
-        p6_reply = (IPv6(src=self.pg0.local_ip6, dst=self.pg1.remote_ip6,
-                         hlim=63) / p_ip6 / p_payload)
+        p6_reply = (
+            IPv6(src=self.pg0.local_ip6, dst=self.pg1.remote_ip6, hlim=63)
+            / p_ip6
+            / p_payload
+        )
 
         return frags, p6_reply
 
     def test_encap(self):
-        """ ip{v4,v6} over ip6 test encap """
+        """ip{v4,v6} over ip6 test encap"""
         p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
-        p_ip6 = IPv6(src="1::1", dst="DEAD::1", tc=42, nh='UDP')
+        p_ip6 = IPv6(src="1::1", dst="DEAD::1", tc=42, nh="UDP")
         p_ip4 = IP(src="1.2.3.4", dst="130.67.0.1", tos=42)
         p_payload = UDP(sport=1234, dport=1234)
 
         # Encapsulation
         # IPv6 in to IPv6 tunnel
-        p6 = (p_ether / p_ip6 / p_payload)
-        p6_reply = (IPv6(src=self.pg0.local_ip6, dst=self.pg1.remote_ip6,
-                         hlim=64) /
-                    p_ip6 / p_payload)
+        p6 = p_ether / p_ip6 / p_payload
+        p6_reply = (
+            IPv6(src=self.pg0.local_ip6, dst=self.pg1.remote_ip6, hlim=64)
+            / p_ip6
+            / p_payload
+        )
         p6_reply[1].hlim -= 1
         rx = self.send_and_expect(self.pg0, p6 * 11, self.pg1)
         for p in rx:
             self.validate(p[1], p6_reply)
 
         # IPv4 in to IPv6 tunnel
-        p4 = (p_ether / p_ip4 / p_payload)
-        p4_reply = (IPv6(src=self.pg0.local_ip6,
-                         dst=self.pg1.remote_ip6, hlim=64) /
-                    p_ip4 / p_payload)
+        p4 = p_ether / p_ip4 / p_payload
+        p4_reply = (
+            IPv6(src=self.pg0.local_ip6, dst=self.pg1.remote_ip6, hlim=64)
+            / p_ip4
+            / p_payload
+        )
         p4_reply[1].ttl -= 1
         rx = self.send_and_expect(self.pg0, p4 * 11, self.pg1)
         for p in rx:
             self.validate(p[1], p4_reply)
 
     def test_decap(self):
-        """ ip{v4,v6} over ip6 test decap """
+        """ip{v4,v6} over ip6 test decap"""
 
         p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
-        p_ip6 = IPv6(src="1::1", dst="DEAD::1", tc=42, nh='UDP')
+        p_ip6 = IPv6(src="1::1", dst="DEAD::1", tc=42, nh="UDP")
         p_ip4 = IP(src="1.2.3.4", dst=self.pg0.remote_ip4)
         p_payload = UDP(sport=1234, dport=1234)
 
         # Decapsulation
         # IPv6 tunnel to IPv4
 
-        p4 = (p_ether / IPv6(src=self.pg1.remote_ip6,
-                             dst=self.pg0.local_ip6) / p_ip4 / p_payload)
-        p4_reply = (p_ip4 / p_payload)
+        p4 = (
+            p_ether
+            / IPv6(src=self.pg1.remote_ip6, dst=self.pg0.local_ip6)
+            / p_ip4
+            / p_payload
+        )
+        p4_reply = p_ip4 / p_payload
         p4_reply.ttl -= 1
         rx = self.send_and_expect(self.pg1, p4 * 11, self.pg0)
         for p in rx:
@@ -779,9 +861,13 @@ class TestIPIP6(VppTestCase):
 
         # IPv6 tunnel to IPv6
         p_ip6 = IPv6(src="1:2:3::4", dst=self.pg0.remote_ip6)
-        p6 = (p_ether / IPv6(src=self.pg1.remote_ip6,
-                             dst=self.pg0.local_ip6) / p_ip6 / p_payload)
-        p6_reply = (p_ip6 / p_payload)
+        p6 = (
+            p_ether
+            / IPv6(src=self.pg1.remote_ip6, dst=self.pg0.local_ip6)
+            / p_ip6
+            / p_payload
+        )
+        p6_reply = p_ip6 / p_payload
         p6_reply.hlim = 63
         rx = self.send_and_expect(self.pg1, p6 * 11, self.pg0)
         for p in rx:
@@ -790,10 +876,10 @@ class TestIPIP6(VppTestCase):
     def verify_ip4ip6_encaps(self, a, p_ip4s, p_ip6_encaps):
         for i, p_ip4 in enumerate(p_ip4s):
             p_ip4.dst = a
-            p4 = (self.p_ether / p_ip4 / self.p_payload)
+            p4 = self.p_ether / p_ip4 / self.p_payload
             p_ip4_inner = p_ip4
             p_ip4_inner.ttl -= 1
-            p6_reply = (p_ip6_encaps[i] / p_ip4_inner / self.p_payload)
+            p6_reply = p_ip6_encaps[i] / p_ip4_inner / self.p_payload
             rx = self.send_and_expect(self.pg0, p4 * N_PACKETS, self.pg1)
             for p in rx:
                 self.validate(p[1], p6_reply)
@@ -802,17 +888,17 @@ class TestIPIP6(VppTestCase):
     def verify_ip6ip6_encaps(self, a, p_ip6s, p_ip6_encaps):
         for i, p_ip6 in enumerate(p_ip6s):
             p_ip6.dst = a
-            p6 = (self.p_ether / p_ip6 / self.p_payload)
+            p6 = self.p_ether / p_ip6 / self.p_payload
             p_inner_ip6 = p_ip6
             p_inner_ip6.hlim -= 1
-            p6_reply = (p_ip6_encaps[i] / p_inner_ip6 / self.p_payload)
+            p6_reply = p_ip6_encaps[i] / p_inner_ip6 / self.p_payload
             rx = self.send_and_expect(self.pg0, p6 * N_PACKETS, self.pg1)
             for p in rx:
                 self.validate(p[1], p6_reply)
                 self.assert_packet_checksums_valid(p)
 
     def test_ipip6(self):
-        """ ip{v4,v6} over ip6 test """
+        """ip{v4,v6} over ip6 test"""
 
         # that's annoying
         self.destroy_tunnel()
@@ -822,7 +908,7 @@ class TestIPIP6(VppTestCase):
         e = VppEnum.vl_api_tunnel_encap_decap_flags_t
         d = VppEnum.vl_api_ip_dscp_t
         self.p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
-        self.p_payload = UDP(sport=1234, dport=1234) / Raw(b'X' * 100)
+        self.p_payload = UDP(sport=1234, dport=1234) / Raw(b"X" * 100)
 
         # create a TOS byte by shifting a DSCP code point 2 bits. those 2 bits
         # are for the ECN.
@@ -836,7 +922,8 @@ class TestIPIP6(VppTestCase):
             self.pg0,
             self.pg0.local_ip6,
             self.pg1.remote_hosts[0].ip6,
-            flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP)
+            flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DSCP,
+        )
         tun_dscp.add_vpp_config()
         # IPv4 transport that copies the DCSP and ECN from the payload
         tun_dscp_ecn = VppIpIpTunInterface(
@@ -844,8 +931,11 @@ class TestIPIP6(VppTestCase):
             self.pg0,
             self.pg0.local_ip6,
             self.pg1.remote_hosts[1].ip6,
-            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
+            ),
+        )
         tun_dscp_ecn.add_vpp_config()
         # IPv4 transport that copies the ECN from the payload and sets the
         # DF bit on encap. copies the ECN on decap
@@ -854,9 +944,12 @@ class TestIPIP6(VppTestCase):
             self.pg0,
             self.pg0.local_ip6,
             self.pg1.remote_hosts[2].ip6,
-            flags=(e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN |
-                   e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_SET_DF |
-                   e.TUNNEL_API_ENCAP_DECAP_FLAG_DECAP_COPY_ECN))
+            flags=(
+                e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_ECN
+                | e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_SET_DF
+                | e.TUNNEL_API_ENCAP_DECAP_FLAG_DECAP_COPY_ECN
+            ),
+        )
         tun_ecn.add_vpp_config()
         # IPv4 transport that sets a fixed DSCP in the encap and copies
         # the DF bit
@@ -866,7 +959,8 @@ class TestIPIP6(VppTestCase):
             self.pg0.local_ip6,
             self.pg1.remote_hosts[3].ip6,
             dscp=d.IP_API_DSCP_AF11,
-            flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DF)
+            flags=e.TUNNEL_API_ENCAP_DECAP_FLAG_ENCAP_COPY_DF,
+        )
         tun.add_vpp_config()
 
         # array of all the tunnels
@@ -877,22 +971,26 @@ class TestIPIP6(VppTestCase):
         a6s = ["" for i in range(len(tuns))]
 
         # IP headers for inner packets with each combination of DSCp/ECN tested
-        p_ip6s = [IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=dscp),
-                  IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=dscp_ecn),
-                  IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=ecn),
-                  IPv6(src="1::1", dst="DEAD::1", nh='UDP', tc=0xff)]
-        p_ip4s = [IP(src="1.2.3.4", dst="130.67.0.1", tos=dscp, flags='DF'),
-                  IP(src="1.2.3.4", dst="130.67.0.1", tos=dscp_ecn),
-                  IP(src="1.2.3.4", dst="130.67.0.1", tos=ecn),
-                  IP(src="1.2.3.4", dst="130.67.0.1", tos=0xff)]
+        p_ip6s = [
+            IPv6(src="1::1", dst="DEAD::1", nh="UDP", tc=dscp),
+            IPv6(src="1::1", dst="DEAD::1", nh="UDP", tc=dscp_ecn),
+            IPv6(src="1::1", dst="DEAD::1", nh="UDP", tc=ecn),
+            IPv6(src="1::1", dst="DEAD::1", nh="UDP", tc=0xFF),
+        ]
+        p_ip4s = [
+            IP(src="1.2.3.4", dst="130.67.0.1", tos=dscp, flags="DF"),
+            IP(src="1.2.3.4", dst="130.67.0.1", tos=dscp_ecn),
+            IP(src="1.2.3.4", dst="130.67.0.1", tos=ecn),
+            IP(src="1.2.3.4", dst="130.67.0.1", tos=0xFF),
+        ]
 
         # Configure each tunnel
         for i, t in enumerate(tuns):
             # Set interface up and enable IP on it
             self.vapi.sw_interface_set_flags(t.sw_if_index, 1)
             self.vapi.sw_interface_set_unnumbered(
-                sw_if_index=self.pg0.sw_if_index,
-                unnumbered_sw_if_index=t.sw_if_index)
+                sw_if_index=self.pg0.sw_if_index, unnumbered_sw_if_index=t.sw_if_index
+            )
 
             # prefix for route / destination address for packets
             a4s[i] = "130.67.%d.0" % i
@@ -900,17 +998,29 @@ class TestIPIP6(VppTestCase):
 
             # Add IPv4 and IPv6 routes via tunnel interface
             ip4_via_tunnel = VppIpRoute(
-                self, a4s[i], 24,
-                [VppRoutePath("0.0.0.0",
-                              t.sw_if_index,
-                              proto=FibPathProto.FIB_PATH_NH_PROTO_IP4)])
+                self,
+                a4s[i],
+                24,
+                [
+                    VppRoutePath(
+                        "0.0.0.0",
+                        t.sw_if_index,
+                        proto=FibPathProto.FIB_PATH_NH_PROTO_IP4,
+                    )
+                ],
+            )
             ip4_via_tunnel.add_vpp_config()
 
             ip6_via_tunnel = VppIpRoute(
-                self, a6s[i], 64,
-                [VppRoutePath("::",
-                              t.sw_if_index,
-                              proto=FibPathProto.FIB_PATH_NH_PROTO_IP6)])
+                self,
+                a6s[i],
+                64,
+                [
+                    VppRoutePath(
+                        "::", t.sw_if_index, proto=FibPathProto.FIB_PATH_NH_PROTO_IP6
+                    )
+                ],
+            )
             ip6_via_tunnel.add_vpp_config()
 
         #
@@ -920,10 +1030,10 @@ class TestIPIP6(VppTestCase):
         # tun_dscp copies only the dscp
         # expected TC values are thus only the DCSP value is present from the
         # inner
-        exp_tcs = [dscp, dscp, 0, 0xfc]
-        p_ip6_encaps = [IPv6(src=self.pg0.local_ip6,
-                             dst=tun_dscp.dst,
-                             tc=tc) for tc in exp_tcs]
+        exp_tcs = [dscp, dscp, 0, 0xFC]
+        p_ip6_encaps = [
+            IPv6(src=self.pg0.local_ip6, dst=tun_dscp.dst, tc=tc) for tc in exp_tcs
+        ]
 
         # IPv4 in to IPv4 tunnel
         self.verify_ip4ip6_encaps(a4s[0], p_ip4s, p_ip6_encaps)
@@ -931,28 +1041,29 @@ class TestIPIP6(VppTestCase):
         self.verify_ip6ip6_encaps(a6s[0], p_ip6s, p_ip6_encaps)
 
         # tun_dscp_ecn copies the dscp and the ecn
-        exp_tcs = [dscp, dscp_ecn, ecn, 0xff]
-        p_ip6_encaps = [IPv6(src=self.pg0.local_ip6,
-                             dst=tun_dscp_ecn.dst,
-                             tc=tc) for tc in exp_tcs]
+        exp_tcs = [dscp, dscp_ecn, ecn, 0xFF]
+        p_ip6_encaps = [
+            IPv6(src=self.pg0.local_ip6, dst=tun_dscp_ecn.dst, tc=tc) for tc in exp_tcs
+        ]
 
         self.verify_ip4ip6_encaps(a4s[1], p_ip4s, p_ip6_encaps)
         self.verify_ip6ip6_encaps(a6s[1], p_ip6s, p_ip6_encaps)
 
         # tun_ecn copies only the ecn and always sets DF
         exp_tcs = [0, ecn, ecn, ecn]
-        p_ip6_encaps = [IPv6(src=self.pg0.local_ip6,
-                             dst=tun_ecn.dst,
-                             tc=tc) for tc in exp_tcs]
+        p_ip6_encaps = [
+            IPv6(src=self.pg0.local_ip6, dst=tun_ecn.dst, tc=tc) for tc in exp_tcs
+        ]
 
         self.verify_ip4ip6_encaps(a4s[2], p_ip4s, p_ip6_encaps)
         self.verify_ip6ip6_encaps(a6s[2], p_ip6s, p_ip6_encaps)
 
         # tun sets a fixed dscp
         fixed_dscp = tun.dscp << 2
-        p_ip6_encaps = [IPv6(src=self.pg0.local_ip6,
-                             dst=tun.dst,
-                             tc=fixed_dscp) for i in range(len(p_ip4s))]
+        p_ip6_encaps = [
+            IPv6(src=self.pg0.local_ip6, dst=tun.dst, tc=fixed_dscp)
+            for i in range(len(p_ip4s))
+        ]
 
         self.verify_ip4ip6_encaps(a4s[3], p_ip4s, p_ip6_encaps)
         self.verify_ip6ip6_encaps(a6s[3], p_ip6s, p_ip6_encaps)
@@ -961,7 +1072,8 @@ class TestIPIP6(VppTestCase):
         # Decapsulation
         #
         n_packets_decapped = self.statistics.get_err_counter(
-            '/err/ipip6-input/packets decapsulated')
+            "/err/ipip6-input/packets decapsulated"
+        )
 
         self.p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
 
@@ -970,15 +1082,13 @@ class TestIPIP6(VppTestCase):
 
         # one overlay packet and all combinations of its encap
         p_ip4 = IP(src="1.2.3.4", dst=self.pg0.remote_ip4)
-        p_ip6_encaps = [IPv6(src=tun.dst,
-                             dst=self.pg0.local_ip6,
-                             tc=tc) for tc in tcs]
+        p_ip6_encaps = [IPv6(src=tun.dst, dst=self.pg0.local_ip6, tc=tc) for tc in tcs]
 
         # for each encap tun will produce the same inner packet because it does
         # not copy up fields from the payload
         for p_ip6_encap in p_ip6_encaps:
-            p6 = (self.p_ether / p_ip6_encap / p_ip4 / self.p_payload)
-            p4_reply = (p_ip4 / self.p_payload)
+            p6 = self.p_ether / p_ip6_encap / p_ip4 / self.p_payload
+            p4_reply = p_ip4 / self.p_payload
             p4_reply.ttl -= 1
             rx = self.send_and_expect(self.pg1, p6 * N_PACKETS, self.pg0)
             n_packets_decapped += N_PACKETS
@@ -986,20 +1096,19 @@ class TestIPIP6(VppTestCase):
                 self.validate(p[1], p4_reply)
                 self.assert_packet_checksums_valid(p)
 
-        err = self.statistics.get_err_counter(
-            '/err/ipip6-input/packets decapsulated')
+        err = self.statistics.get_err_counter("/err/ipip6-input/packets decapsulated")
         self.assertEqual(err, n_packets_decapped)
 
         # tun_ecn copies the ECN bits from the encap to the inner
-        p_ip6_encaps = [IPv6(src=tun_ecn.dst,
-                             dst=self.pg0.local_ip6,
-                             tc=tc) for tc in tcs]
+        p_ip6_encaps = [
+            IPv6(src=tun_ecn.dst, dst=self.pg0.local_ip6, tc=tc) for tc in tcs
+        ]
         p_ip4_replys = [p_ip4.copy() for i in range(len(p_ip6_encaps))]
         p_ip4_replys[2].tos = ecn
         p_ip4_replys[3].tos = ecn
         for i, p_ip6_encap in enumerate(p_ip6_encaps):
-            p6 = (self.p_ether / p_ip6_encap / p_ip4 / self.p_payload)
-            p4_reply = (p_ip4_replys[i] / self.p_payload)
+            p6 = self.p_ether / p_ip6_encap / p_ip4 / self.p_payload
+            p4_reply = p_ip4_replys[i] / self.p_payload
             p4_reply.ttl -= 1
             rx = self.send_and_expect(self.pg1, p6 * N_PACKETS, self.pg0)
             n_packets_decapped += N_PACKETS
@@ -1007,20 +1116,17 @@ class TestIPIP6(VppTestCase):
                 self.validate(p[1], p4_reply)
                 self.assert_packet_checksums_valid(p)
 
-        err = self.statistics.get_err_counter(
-            '/err/ipip6-input/packets decapsulated')
+        err = self.statistics.get_err_counter("/err/ipip6-input/packets decapsulated")
         self.assertEqual(err, n_packets_decapped)
 
         # IPv6 tunnel to IPv6
         # for each encap tun will produce the same inner packet because it does
         # not copy up fields from the payload
-        p_ip6_encaps = [IPv6(src=tun.dst,
-                             dst=self.pg0.local_ip6,
-                             tc=tc) for tc in tcs]
+        p_ip6_encaps = [IPv6(src=tun.dst, dst=self.pg0.local_ip6, tc=tc) for tc in tcs]
         p_ip6 = IPv6(src="1:2:3::4", dst=self.pg0.remote_ip6)
         for p_ip6_encap in p_ip6_encaps:
-            p6 = (self.p_ether / p_ip6_encap / p_ip6 / self.p_payload)
-            p6_reply = (p_ip6 / self.p_payload)
+            p6 = self.p_ether / p_ip6_encap / p_ip6 / self.p_payload
+            p6_reply = p_ip6 / self.p_payload
             p6_reply.hlim = 63
             rx = self.send_and_expect(self.pg1, p6 * N_PACKETS, self.pg0)
             n_packets_decapped += N_PACKETS
@@ -1028,22 +1134,21 @@ class TestIPIP6(VppTestCase):
                 self.validate(p[1], p6_reply)
                 self.assert_packet_checksums_valid(p)
 
-        err = self.statistics.get_err_counter(
-            '/err/ipip6-input/packets decapsulated')
+        err = self.statistics.get_err_counter("/err/ipip6-input/packets decapsulated")
         self.assertEqual(err, n_packets_decapped)
 
         # IPv6 tunnel to IPv6
         # tun_ecn copies the ECN bits from the encap to the inner
-        p_ip6_encaps = [IPv6(src=tun_ecn.dst,
-                             dst=self.pg0.local_ip6,
-                             tc=tc) for tc in tcs]
+        p_ip6_encaps = [
+            IPv6(src=tun_ecn.dst, dst=self.pg0.local_ip6, tc=tc) for tc in tcs
+        ]
         p_ip6 = IPv6(src="1:2:3::4", dst=self.pg0.remote_ip6)
         p_ip6_replys = [p_ip6.copy() for i in range(len(p_ip6_encaps))]
         p_ip6_replys[2].tc = ecn
         p_ip6_replys[3].tc = ecn
         for i, p_ip6_encap in enumerate(p_ip6_encaps):
-            p6 = (self.p_ether / p_ip6_encap / p_ip6 / self.p_payload)
-            p6_reply = (p_ip6_replys[i] / self.p_payload)
+            p6 = self.p_ether / p_ip6_encap / p_ip6 / self.p_payload
+            p6_reply = p_ip6_replys[i] / self.p_payload
             p6_reply.hlim = 63
             rx = self.send_and_expect(self.pg1, p6 * N_PACKETS, self.pg0)
             n_packets_decapped += N_PACKETS
@@ -1051,15 +1156,14 @@ class TestIPIP6(VppTestCase):
                 self.validate(p[1], p6_reply)
                 self.assert_packet_checksums_valid(p)
 
-        err = self.statistics.get_err_counter(
-            '/err/ipip6-input/packets decapsulated')
+        err = self.statistics.get_err_counter("/err/ipip6-input/packets decapsulated")
         self.assertEqual(err, n_packets_decapped)
 
     def test_frag(self):
-        """ ip{v4,v6} over ip6 test frag """
+        """ip{v4,v6} over ip6 test frag"""
 
         p_ether = Ether(src=self.pg1.remote_mac, dst=self.pg1.local_mac)
-        p_ip6 = IPv6(src="1::1", dst="DEAD::1", tc=42, nh='UDP')
+        p_ip6 = IPv6(src="1::1", dst="DEAD::1", tc=42, nh="UDP")
         p_ip4 = IP(src="1.2.3.4", dst=self.pg0.remote_ip4)
         p_payload = UDP(sport=1234, dport=1234)
 
@@ -1067,17 +1171,21 @@ class TestIPIP6(VppTestCase):
         # Fragmentation / Reassembly and Re-fragmentation
         #
         rv = self.vapi.ip_reassembly_enable_disable(
-            sw_if_index=self.pg1.sw_if_index,
-            enable_ip6=1)
+            sw_if_index=self.pg1.sw_if_index, enable_ip6=1
+        )
 
-        self.vapi.ip_reassembly_set(timeout_ms=1000, max_reassemblies=1000,
-                                    max_reassembly_length=1000,
-                                    expire_walk_interval_ms=10000,
-                                    is_ip6=1)
+        self.vapi.ip_reassembly_set(
+            timeout_ms=1000,
+            max_reassemblies=1000,
+            max_reassembly_length=1000,
+            expire_walk_interval_ms=10000,
+            is_ip6=1,
+        )
 
         # Send lots of fragments, verify reassembled packet
         before_cnt = self.statistics.get_err_counter(
-            '/err/ipip6-input/packets decapsulated')
+            "/err/ipip6-input/packets decapsulated"
+        )
         frags, p6_reply = self.generate_ip6_frags(3131, 1400)
         f = []
         for i in range(0, 1000):
@@ -1090,8 +1198,7 @@ class TestIPIP6(VppTestCase):
         for p in rx:
             self.validate(p[1], p6_reply)
 
-        cnt = self.statistics.get_err_counter(
-            '/err/ipip6-input/packets decapsulated')
+        cnt = self.statistics.get_err_counter("/err/ipip6-input/packets decapsulated")
         self.assertEqual(cnt, before_cnt + 1000)
 
         f = []
@@ -1117,10 +1224,12 @@ class TestIPIP6(VppTestCase):
         # IPv6 in to IPv6 tunnel
         p_payload = UDP(sport=1234, dport=1234) / self.payload(1300)
 
-        p6 = (p_ether / p_ip6 / p_payload)
-        p6_reply = (IPv6(src=self.pg0.local_ip6, dst=self.pg1.remote_ip6,
-                         hlim=63) /
-                    p_ip6 / p_payload)
+        p6 = p_ether / p_ip6 / p_payload
+        p6_reply = (
+            IPv6(src=self.pg0.local_ip6, dst=self.pg1.remote_ip6, hlim=63)
+            / p_ip6
+            / p_payload
+        )
         p6_reply[1].hlim -= 1
         self.pg_enable_capture()
         self.pg0.add_stream(p6)
@@ -1151,47 +1260,49 @@ class TestIPIP6(VppTestCase):
         self.validate(reass_pkt, p6_reply)
 
     def test_ip6_mpls_frag(self):
-        """ Test fragmenting IPv6 over MPLS """
+        """Test fragmenting IPv6 over MPLS"""
 
         # IPv6 packets must be locally generated to be fragmented
         # the use of tunnel encaps
         tun_dst = VppIpRoute(
-            self, "1000::1", 128,
-            [VppRoutePath(self.pg1.remote_ip6,
-                          self.pg1.sw_if_index,
-                          labels=[VppMplsLabel(32)])]).add_vpp_config()
+            self,
+            "1000::1",
+            128,
+            [
+                VppRoutePath(
+                    self.pg1.remote_ip6, self.pg1.sw_if_index, labels=[VppMplsLabel(32)]
+                )
+            ],
+        ).add_vpp_config()
 
         tun = VppIpIpTunInterface(
-            self,
-            self.pg0,
-            self.pg0.local_ip6,
-            "1000::1").add_vpp_config()
+            self, self.pg0, self.pg0.local_ip6, "1000::1"
+        ).add_vpp_config()
 
         tun.admin_up()
         tun.config_ip6()
         tun.config_ip4()
 
-        self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index,
-                                       [2000, 0, 0, 0])
-
-        p_6k = (Ether(dst=self.pg0.local_mac,
-                      src=self.pg0.remote_mac) /
-                IPv6(src=self.pg0.remote_ip6,
-                     dst=tun.remote_ip6) /
-                UDP(sport=1234, dport=5678) /
-                Raw(b'0xa' * 2000))
-        p_2k = (Ether(dst=self.pg0.local_mac,
-                      src=self.pg0.remote_mac) /
-                IPv6(src=self.pg0.remote_ip6,
-                     dst=tun.remote_ip6) /
-                UDP(sport=1234, dport=5678) /
-                Raw(b'0xa' * 1000))
-        p_1k = (Ether(dst=self.pg0.local_mac,
-                      src=self.pg0.remote_mac) /
-                IPv6(src=self.pg0.remote_ip6,
-                     dst=tun.remote_ip6) /
-                UDP(sport=1234, dport=5678) /
-                Raw(b'0xa' * 600))
+        self.vapi.sw_interface_set_mtu(self.pg1.sw_if_index, [2000, 0, 0, 0])
+
+        p_6k = (
+            Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+            / IPv6(src=self.pg0.remote_ip6, dst=tun.remote_ip6)
+            / UDP(sport=1234, dport=5678)
+            / Raw(b"0xa" * 2000)
+        )
+        p_2k = (
+            Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+            / IPv6(src=self.pg0.remote_ip6, dst=tun.remote_ip6)
+            / UDP(sport=1234, dport=5678)
+            / Raw(b"0xa" * 1000)
+        )
+        p_1k = (
+            Ether(dst=self.pg0.local_mac, src=self.pg0.remote_mac)
+            / IPv6(src=self.pg0.remote_ip6, dst=tun.remote_ip6)
+            / UDP(sport=1234, dport=5678)
+            / Raw(b"0xa" * 600)
+        )
 
         # this is now the interface MTU frags
         rxs = self.send_and_expect(self.pg0, [p_6k], self.pg1, n_rx=4)
@@ -1204,26 +1315,26 @@ class TestIPIP6(VppTestCase):
         self.send_and_expect(self.pg0, [p_1k], self.pg1)
 
     def test_ipip_create(self):
-        """ ipip create / delete interface test """
-        rv = ipip_add_tunnel(self, '1.2.3.4', '2.3.4.5')
+        """ipip create / delete interface test"""
+        rv = ipip_add_tunnel(self, "1.2.3.4", "2.3.4.5")
         sw_if_index = rv.sw_if_index
         self.vapi.ipip_del_tunnel(sw_if_index)
 
     def test_ipip_vrf_create(self):
-        """ ipip create / delete interface VRF test """
+        """ipip create / delete interface VRF test"""
 
         t = VppIpTable(self, 20)
         t.add_vpp_config()
-        rv = ipip_add_tunnel(self, '1.2.3.4', '2.3.4.5', table_id=20)
+        rv = ipip_add_tunnel(self, "1.2.3.4", "2.3.4.5", table_id=20)
         sw_if_index = rv.sw_if_index
         self.vapi.ipip_del_tunnel(sw_if_index)
 
     def payload(self, len):
-        return 'x' * len
+        return "x" * len
 
 
 class TestIPIPMPLS(VppTestCase):
-    """ MPLS Test Case """
+    """MPLS Test Case"""
 
     @classmethod
     def setUpClass(cls):
@@ -1254,62 +1365,69 @@ class TestIPIPMPLS(VppTestCase):
             i.admin_down()
 
     def test_mpls(self):
-        """ MPLS over ip{6,4} test """
+        """MPLS over ip{6,4} test"""
 
         tbl = VppMplsTable(self, 0)
         tbl.add_vpp_config()
 
         self.p_ether = Ether(src=self.pg0.remote_mac, dst=self.pg0.local_mac)
-        self.p_payload = UDP(sport=1234, dport=1234) / Raw(b'X' * 100)
+        self.p_payload = UDP(sport=1234, dport=1234) / Raw(b"X" * 100)
         f = FibPathProto
 
         # IPv4 transport
         tun4 = VppIpIpTunInterface(
-            self,
-            self.pg1,
-            self.pg1.local_ip4,
-            self.pg1.remote_ip4).add_vpp_config()
+            self, self.pg1, self.pg1.local_ip4, self.pg1.remote_ip4
+        ).add_vpp_config()
         tun4.admin_up()
         tun4.config_ip4()
         tun4.enable_mpls()
 
         # IPv6 transport
         tun6 = VppIpIpTunInterface(
-            self,
-            self.pg1,
-            self.pg1.local_ip6,
-            self.pg1.remote_ip6).add_vpp_config()
+            self, self.pg1, self.pg1.local_ip6, self.pg1.remote_ip6
+        ).add_vpp_config()
         tun6.admin_up()
         tun6.config_ip6()
         tun6.enable_mpls()
 
         # ip routes into the tunnels with output labels
-        r4 = VppIpRoute(self, "1.1.1.1", 32,
-                        [VppRoutePath(
-                            tun4.remote_ip4,
-                            tun4.sw_if_index,
-                            labels=[VppMplsLabel(44)])]).add_vpp_config()
-        r6 = VppIpRoute(self, "1::1", 128,
-                        [VppRoutePath(
-                            tun6.remote_ip6,
-                            tun6.sw_if_index,
-                            labels=[VppMplsLabel(66)])]).add_vpp_config()
+        r4 = VppIpRoute(
+            self,
+            "1.1.1.1",
+            32,
+            [
+                VppRoutePath(
+                    tun4.remote_ip4, tun4.sw_if_index, labels=[VppMplsLabel(44)]
+                )
+            ],
+        ).add_vpp_config()
+        r6 = VppIpRoute(
+            self,
+            "1::1",
+            128,
+            [
+                VppRoutePath(
+                    tun6.remote_ip6, tun6.sw_if_index, labels=[VppMplsLabel(66)]
+                )
+            ],
+        ).add_vpp_config()
 
         # deag MPLS routes from the tunnel
-        r4 = VppMplsRoute(self, 44, 1,
-                          [VppRoutePath(
-                              self.pg0.remote_ip4,
-                              self.pg0.sw_if_index)]).add_vpp_config()
-        r6 = VppMplsRoute(self, 66, 1,
-                          [VppRoutePath(
-                              self.pg0.remote_ip6,
-                              self.pg0.sw_if_index)],
-                          eos_proto=f.FIB_PATH_NH_PROTO_IP6).add_vpp_config()
+        r4 = VppMplsRoute(
+            self, 44, 1, [VppRoutePath(self.pg0.remote_ip4, self.pg0.sw_if_index)]
+        ).add_vpp_config()
+        r6 = VppMplsRoute(
+            self,
+            66,
+            1,
+            [VppRoutePath(self.pg0.remote_ip6, self.pg0.sw_if_index)],
+            eos_proto=f.FIB_PATH_NH_PROTO_IP6,
+        ).add_vpp_config()
 
         #
         # Tunnel Encap
         #
-        p4 = (self.p_ether / IP(src="2.2.2.2", dst="1.1.1.1") / self.p_payload)
+        p4 = self.p_ether / IP(src="2.2.2.2", dst="1.1.1.1") / self.p_payload
 
         rxs = self.send_and_expect(self.pg0, p4 * N_PACKETS, self.pg1)
 
@@ -1321,7 +1439,7 @@ class TestIPIPMPLS(VppTestCase):
             self.assertEqual(inner.src, "2.2.2.2")
             self.assertEqual(inner.dst, "1.1.1.1")
 
-        p6 = (self.p_ether / IPv6(src="2::2", dst="1::1") / self.p_payload)
+        p6 = self.p_ether / IPv6(src="2::2", dst="1::1") / self.p_payload
 
         rxs = self.send_and_expect(self.pg0, p6 * N_PACKETS, self.pg1)
 
@@ -1336,13 +1454,13 @@ class TestIPIPMPLS(VppTestCase):
         #
         # Tunnel Decap
         #
-        p4 = (self.p_ether /
-              IP(src=self.pg1.remote_ip4,
-                 dst=self.pg1.local_ip4) /
-              MPLS(label=44, ttl=4) /
-              IP(src="1.1.1.1",
-                 dst="2.2.2.2") /
-              self.p_payload)
+        p4 = (
+            self.p_ether
+            / IP(src=self.pg1.remote_ip4, dst=self.pg1.local_ip4)
+            / MPLS(label=44, ttl=4)
+            / IP(src="1.1.1.1", dst="2.2.2.2")
+            / self.p_payload
+        )
 
         rxs = self.send_and_expect(self.pg1, p4 * N_PACKETS, self.pg0)
 
@@ -1350,13 +1468,13 @@ class TestIPIPMPLS(VppTestCase):
             self.assertEqual(rx[IP].src, "1.1.1.1")
             self.assertEqual(rx[IP].dst, "2.2.2.2")
 
-        p6 = (self.p_ether /
-              IPv6(src=self.pg1.remote_ip6,
-                   dst=self.pg1.local_ip6) /
-              MPLS(label=66, ttl=4) /
-              IPv6(src="1::1",
-                   dst="2::2") /
-              self.p_payload)
+        p6 = (
+            self.p_ether
+            / IPv6(src=self.pg1.remote_ip6, dst=self.pg1.local_ip6)
+            / MPLS(label=66, ttl=4)
+            / IPv6(src="1::1", dst="2::2")
+            / self.p_payload
+        )
 
         rxs = self.send_and_expect(self.pg1, p6 * N_PACKETS, self.pg0)
 
@@ -1368,5 +1486,5 @@ class TestIPIPMPLS(VppTestCase):
         tun6.disable_mpls()
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     unittest.main(testRunner=VppTestRunner)