L2 Emulation

L2 Emulation is a feautre that is applied to L2 ports to 'extract'
IP packets from the L2 path and inject them into the L3 path (i.e.
into the appropriate ip[4|6]_input node).
L3 routes in the table_id for that interface should then be configured
as DVR routes, therefore the forwarded packet has the L2 header
preserved and togehter the L3 routed system behaves like an L2 bridge.

Change-Id: I8effd7e2f4c67ee277b73c7bc79aa3e5a3e34d03
Signed-off-by: Neale Ranns <nranns@cisco.com>

1 files changed, 167 insertions, 0 deletions

diff --git a/src/vpp-api/vom/l2_emulation.cpp b/src/vpp-api/vom/l2_emulation.cpp
new file mode 100644
index 00000000000..2a2757616be
--- /dev/null
+++ b/src/vpp-api/vom/l2_emulation.cpp
@@ -0,0 +1,167 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "vom/l2_emulation.hpp"
+#include "vom/l2_emulation_cmds.hpp"
+
+namespace VOM {
+/**
+ * A DB of all the L2 Configs
+ */
+singular_db<l2_emulation::key_t, l2_emulation> l2_emulation::m_db;
+
+l2_emulation::event_handler l2_emulation::m_evh;
+
+/**
+ * Construct a new object matching the desried state
+ */
+l2_emulation::l2_emulation(const interface& itf)
+  : m_itf(itf.singular())
+  , m_emulation(0)
+{
+}
+
+l2_emulation::l2_emulation(const l2_emulation& o)
+  : m_itf(o.m_itf)
+  , m_emulation(0)
+{
+}
+
+const l2_emulation::key_t&
+l2_emulation::key() const
+{
+  return (m_itf->key());
+}
+
+bool
+l2_emulation::operator==(const l2_emulation& l) const
+{
+  return ((*m_itf == *l.m_itf));
+}
+
+std::shared_ptr<l2_emulation>
+l2_emulation::find(const key_t& key)
+{
+  return (m_db.find(key));
+}
+
+void
+l2_emulation::sweep()
+{
+  if (m_emulation && handle_t::INVALID != m_itf->handle()) {
+    HW::enqueue(
+      new l2_emulation_cmds::enable_cmd(m_emulation, m_itf->handle()));
+  }
+
+  // no need to undo the VTR operation.
+  HW::write();
+}
+
+void
+l2_emulation::replay()
+{
+  if (m_emulation && handle_t::INVALID != m_itf->handle()) {
+    HW::enqueue(
+      new l2_emulation_cmds::disable_cmd(m_emulation, m_itf->handle()));
+  }
+}
+
+l2_emulation::~l2_emulation()
+{
+  sweep();
+
+  // not in the DB anymore.
+  m_db.release(m_itf->key(), this);
+}
+
+std::string
+l2_emulation::to_string() const
+{
+  std::ostringstream s;
+  s << "L2-emulation:[" << m_itf->to_string() << "]";
+
+  return (s.str());
+}
+
+void
+l2_emulation::update(const l2_emulation& desired)
+{
+  /*
+   * the desired state is always that the interface should be created
+   */
+  if (rc_t::OK != m_emulation.rc()) {
+    HW::enqueue(
+      new l2_emulation_cmds::enable_cmd(m_emulation, m_itf->handle()));
+  }
+}
+
+std::shared_ptr<l2_emulation>
+l2_emulation::find_or_add(const l2_emulation& temp)
+{
+  return (m_db.find_or_add(temp.m_itf->key(), temp));
+}
+
+std::shared_ptr<l2_emulation>
+l2_emulation::singular() const
+{
+  return find_or_add(*this);
+}
+
+void
+l2_emulation::dump(std::ostream& os)
+{
+  m_db.dump(os);
+}
+
+l2_emulation::event_handler::event_handler()
+{
+  OM::register_listener(this);
+  inspect::register_handler({ "l2e" }, "L2 Emulation", this);
+}
+
+void
+l2_emulation::event_handler::handle_replay()
+{
+  m_db.replay();
+}
+
+void
+l2_emulation::event_handler::handle_populate(const client_db::key_t& key)
+{
+  /**
+   * This is done while populating the bridge-domain
+   */
+}
+
+dependency_t
+l2_emulation::event_handler::order() const
+{
+  return (dependency_t::BINDING);
+}
+
+void
+l2_emulation::event_handler::show(std::ostream& os)
+{
+  m_db.dump(os);
+}
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "mozilla")
+ * End:
+ */