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diff --git a/extras/vom/vom/interface_span.cpp b/extras/vom/vom/interface_span.cpp
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+/*
+ * 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/interface_span.hpp"
+#include "vom/interface_span_cmds.hpp"
+#include "vom/singular_db_funcs.hpp"
+
+namespace VOM {
+/**
+ * A DB of all interface_span config
+ */
+singular_db<interface_span::key_t, interface_span> interface_span::m_db;
+
+interface_span::event_handler interface_span::m_evh;
+
+interface_span::interface_span(const interface& itf_from,
+ const interface& itf_to,
+ interface_span::state_t state)
+ : m_itf_from(itf_from.singular())
+ , m_itf_to(itf_to.singular())
+ , m_state(state)
+ , m_config(true)
+{
+}
+
+interface_span::interface_span(const interface_span& o)
+ : m_itf_from(o.m_itf_from)
+ , m_itf_to(o.m_itf_to)
+ , m_state(o.m_state)
+ , m_config(o.m_config)
+{
+}
+
+interface_span::~interface_span()
+{
+ sweep();
+
+ // not in the DB anymore.
+ m_db.release(make_pair(m_itf_from->key(), m_itf_to->key()), this);
+}
+
+void
+interface_span::sweep()
+{
+ if (m_config) {
+ HW::enqueue(new interface_span_cmds::unconfig_cmd(
+ m_config, m_itf_from->handle(), m_itf_to->handle()));
+ }
+ HW::write();
+}
+
+void
+interface_span::dump(std::ostream& os)
+{
+ db_dump(m_db, os);
+}
+
+void
+interface_span::replay()
+{
+ if (m_config) {
+ HW::enqueue(new interface_span_cmds::config_cmd(
+ m_config, m_itf_from->handle(), m_itf_to->handle(), m_state));
+ }
+}
+
+std::string
+interface_span::to_string() const
+{
+ std::ostringstream s;
+ s << "Itf Span-config:"
+ << " itf-from:" << m_itf_from->to_string()
+ << " itf-to:" << m_itf_to->to_string() << " state:" << m_state.to_string();
+
+ return (s.str());
+}
+
+void
+interface_span::update(const interface_span& desired)
+{
+ if (!m_config) {
+ HW::enqueue(new interface_span_cmds::config_cmd(
+ m_config, m_itf_from->handle(), m_itf_to->handle(), m_state));
+ }
+}
+
+std::ostream&
+operator<<(std::ostream& os, const interface_span::key_t& key)
+{
+ os << "[" << key.first << ", " << key.second << "]";
+
+ return (os);
+}
+
+std::shared_ptr<interface_span>
+interface_span::find_or_add(const interface_span& temp)
+{
+ return (m_db.find_or_add(
+ make_pair(temp.m_itf_from->key(), temp.m_itf_to->key()), temp));
+}
+
+std::shared_ptr<interface_span>
+interface_span::singular() const
+{
+ return find_or_add(*this);
+}
+
+interface_span::event_handler::event_handler()
+{
+ OM::register_listener(this);
+ inspect::register_handler({ "itf-span" }, "interface span configurations",
+ this);
+}
+
+void
+interface_span::event_handler::handle_replay()
+{
+ m_db.replay();
+}
+
+void
+interface_span::event_handler::handle_populate(const client_db::key_t& key)
+{
+ std::shared_ptr<interface_span_cmds::dump_cmd> cmd =
+ std::make_shared<interface_span_cmds::dump_cmd>();
+
+ HW::enqueue(cmd);
+ HW::write();
+
+ for (auto& record : *cmd) {
+ auto& payload = record.get_payload();
+
+ std::shared_ptr<interface> itf_from =
+ interface::find(payload.sw_if_index_from);
+ std::shared_ptr<interface> itf_to = interface::find(payload.sw_if_index_to);
+
+ interface_span itf_span(*itf_from, *itf_to,
+ state_t::from_int(payload.state));
+
+ VOM_LOG(log_level_t::DEBUG) << "span-dump: " << itf_from->to_string()
+ << itf_to->to_string()
+ << state_t::from_int(payload.state).to_string();
+
+ /*
+ * Write each of the discovered interfaces into the OM,
+ * but disable the HW Command q whilst we do, so that no
+ * commands are sent to VPP
+ */
+ OM::commit(key, itf_span);
+ }
+}
+
+dependency_t
+interface_span::event_handler::order() const
+{
+ return (dependency_t::BINDING);
+}
+
+void
+interface_span::event_handler::show(std::ostream& os)
+{
+ db_dump(m_db, os);
+}
+
+const interface_span::state_t interface_span::state_t::DISABLED(0, "disable");
+const interface_span::state_t interface_span::state_t::RX_ENABLED(1,
+ "rx-enable");
+const interface_span::state_t interface_span::state_t::TX_ENABLED(2,
+ "tx-enable");
+const interface_span::state_t interface_span::state_t::TX_RX_ENABLED(
+ 3,
+ "tx-rx-enable");
+
+interface_span::state_t::state_t(int v, const std::string& s)
+ : enum_base<interface_span::state_t>(v, s)
+{
+}
+
+interface_span::state_t
+interface_span::state_t::from_int(uint8_t i)
+{
+ switch (i) {
+ case 0:
+ return interface_span::state_t::DISABLED;
+ break;
+ case 1:
+ return interface_span::state_t::RX_ENABLED;
+ break;
+ case 2:
+ return interface_span::state_t::TX_ENABLED;
+ break;
+ case 3:
+ default:
+ break;
+ }
+
+ return interface_span::state_t::TX_RX_ENABLED;
+}
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "mozilla")
+ * End:
+ */