commit eb284a1f8f10d752285a0a59e75bc54acae50779
author Ole Troan <ot@cisco.com> Wed Oct 09 13:33:19 2019 +0200
committer Neale Ranns <nranns@cisco.com> Mon Nov 11 12:33:36 2019 +0000
tree 4ce777b223a51fa70f9e0dc18e7842b488b81cd6
parent d318a996b7bdcf0246b2d9927a918a3773a88fa6

ip: functional interface to ip fragmentation

This provides a functional interface to IP fragmentation.
Allowing external features to fragment. Supports
arbitrary encap size, for e.g. MPLS or inner fragmentation
of tunnels.

This also removed dual loop in MAP that was fundamentally broken.

Type: fix
Signed-off-by: Ole Troan <ot@cisco.com>
Change-Id: Ia89ecec8ee3cbe2416edbe87630fdb714898c2a8
Signed-off-by: Ole Troan <ot@cisco.com>

test/test_mpls.py

diff --git a/test/test_mpls.py b/test/test_mpls.py
index ebeea5f..8ed047d 100644
--- a/test/test_mpls.py
+++ b/test/test_mpls.py
@@ -154,7 +154,8 @@
             pkts.append(p)
         return pkts
 
-    def create_stream_ip4(self, src_if, dst_ip, ip_ttl=64, ip_dscp=0):
+    def create_stream_ip4(self, src_if, dst_ip, ip_ttl=64,
+                          ip_dscp=0, payload_size=None):
         self.reset_packet_infos()
         pkts = []
         for i in range(0, 257):
@@ -166,6 +167,8 @@
                  UDP(sport=1234, dport=1234) /
                  Raw(payload))
             info.data = p.copy()
+            if payload_size:
+                self.extend_packet(p, payload_size)
             pkts.append(p)
         return pkts
 
@@ -911,7 +914,7 @@
         """ MPLS Tunnel Tests - Pipe """
 
         #
-        # Create a tunnel with a single out label
+        # Create a tunnel with two out labels
         #
         mpls_tun = VppMPLSTunnelInterface(
             self,
@@ -964,6 +967,38 @@
                                           VppMplsLabel(46),
                                           VppMplsLabel(33, ttl=255)])
 
+        #
+        # change tunnel's MTU to a low value
+        #
+        mpls_tun.set_l3_mtu(1200)
+
+        # send IP into the tunnel to be fragmented
+        tx = self.create_stream_ip4(self.pg0, "10.0.0.3",
+                                    payload_size=1500)
+        rx = self.send_and_expect(self.pg0, tx, self.pg0, len(tx)*2)
+
+        fake_tx = []
+        for p in tx:
+            fake_tx.append(p)
+            fake_tx.append(p)
+        self.verify_capture_tunneled_ip4(self.pg0, rx, fake_tx,
+                                         [VppMplsLabel(44),
+                                          VppMplsLabel(46)])
+
+        # send MPLS into the tunnel to be fragmented
+        tx = self.create_stream_ip4(self.pg0, "10.0.0.4",
+                                    payload_size=1500)
+        rx = self.send_and_expect(self.pg0, tx, self.pg0, len(tx)*2)
+
+        fake_tx = []
+        for p in tx:
+            fake_tx.append(p)
+            fake_tx.append(p)
+        self.verify_capture_tunneled_ip4(self.pg0, rx, fake_tx,
+                                         [VppMplsLabel(44),
+                                          VppMplsLabel(46),
+                                          VppMplsLabel(33, ttl=255)])
+
     def test_tunnel_uniform(self):
         """ MPLS Tunnel Tests - Uniform """