commit f3ee8089277b768483417556df629248db33076d
author Eric Newberry <enewberry@cs.ucla.edu> Tue Jan 28 13:44:18 2020 -0800
committer Eric Newberry <enewberry@cs.ucla.edu> Sun Feb 09 14:34:00 2020 -0800
tree 1eefbd3a90b664a75c970cad4659b2938f411efa
parent 97f26a2618df621a8e97a4fef15984d8f4d7ef6a

face: support runtime MTU changes on Ethernet faces

refs #3257

Change-Id: I160fe444b889b8f7be19022a2bd52bbc9f7a21aa

tests/daemon/face/generic-link-service.t.cpp

diff --git a/tests/daemon/face/generic-link-service.t.cpp b/tests/daemon/face/generic-link-service.t.cpp
index 8006fbb..693d393 100644
--- a/tests/daemon/face/generic-link-service.t.cpp
+++ b/tests/daemon/face/generic-link-service.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2019,  Regents of the University of California,
+ * Copyright (c) 2014-2020,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -282,6 +282,24 @@
   BOOST_CHECK_EQUAL(service->getCounters().nOutOverMtu, 1);
 }
 
+// It is possible for some interfaces (e.g., virtual Ethernet) to have their MTU set to zero
+// This test case ensures that packets are dropped if the MTU is zero
+BOOST_AUTO_TEST_CASE(FragmentationDisabledZeroMtuDrop)
+{
+  // Initialize with Options that disable fragmentation
+  GenericLinkService::Options options;
+  options.allowFragmentation = false;
+  initialize(options);
+
+  transport->setMtu(0);
+
+  auto data = makeData("/test/data/123456789/987654321/123456789");
+  face->sendData(*data, 0);
+
+  BOOST_CHECK_EQUAL(transport->sentPackets.size(), 0);
+  BOOST_CHECK_EQUAL(service->getCounters().nOutOverMtu, 1);
+}
+
 BOOST_AUTO_TEST_CASE(FragmentationUnlimitedMtu)
 {
   // Initialize with Options that enable fragmentation
@@ -327,6 +345,24 @@
   BOOST_CHECK_GT(transport->sentPackets.size(), 1);
 }
 
+// It is possible for some interfaces (e.g., virtual Ethernet) to have their MTU set to zero
+// This test case ensures that packets are dropped if the MTU is zero
+BOOST_AUTO_TEST_CASE(FragmentationZeroMtuDrop)
+{
+  // Initialize with Options that enable fragmentation
+  GenericLinkService::Options options;
+  options.allowFragmentation = true;
+  initialize(options);
+
+  transport->setMtu(0);
+
+  auto data = makeData("/test/data/123456789/987654321/123456789");
+  face->sendData(*data, 0);
+
+  BOOST_CHECK_EQUAL(transport->sentPackets.size(), 0);
+  BOOST_CHECK_EQUAL(service->getCounters().nFragmentationErrors, 1);
+}
+
 BOOST_AUTO_TEST_CASE(ReassembleFragments)
 {
   // Initialize with Options that enables reassembly