1 files changed, 93 insertions, 0 deletions
diff --git a/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsLookupWriter.java b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsLookupWriter.java
new file mode 100644
index 000000000..c845c7aeb
--- /dev/null
+++ b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsLookupWriter.java
@@ -0,0 +1,93 @@
+/*
+ * 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.
+ */
+
+package io.fd.hc2vpp.mpls;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import io.fd.honeycomb.translate.MappingContext;
+import io.fd.honeycomb.translate.write.WriteFailedException;
+import io.fd.vpp.jvpp.core.dto.MplsRouteAddDel;
+import io.fd.vpp.jvpp.core.future.FutureJVppCore;
+import javax.annotation.Nonnull;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310.StaticLspConfig;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310._static.lsp.Config;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310._static.lsp_config.InSegment;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310._static.lsp_config.in.segment.type.MplsLabel;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310.routing.mpls._static.lsps.StaticLsp;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.mpls.rev171120.LookupType;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.mpls.rev171120.StaticLspVppLookupAugmentation;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Translates {@link StaticLspConfig.Operation#PopAndLookup} operation with {@link LookupType#Mpls} to
+ * mpls_route_add_del API.
+ *
+ * @see <a href="https://git.fd.io/vpp/tree/src/vnet/mpls/mpls.api">mpls_route_add_del</a> definition
+ */
+final class MplsLookupWriter implements LspWriter {
+    private static final byte MPLS_PROTOCOL = (byte) LookupType.Mpls.getIntValue();
+
+    private final FutureJVppCore vppApi;
+
+    MplsLookupWriter(@Nonnull final FutureJVppCore vppApi) {
+        this.vppApi = vppApi;
+    }
+
+    @Override
+    public void write(@Nonnull final InstanceIdentifier<StaticLsp> id, @Nonnull final StaticLsp data,
+                      @Nonnull final MappingContext ctx, final boolean isAdd) throws WriteFailedException {
+        final Config config = data.getConfig();
+        final MplsRouteAddDel request = new MplsRouteAddDel();
+
+        request.mrIsAdd = booleanToByte(isAdd);
+
+        translate(request, config);
+        translate(request, config.getAugmentation(StaticLspVppLookupAugmentation.class));
+
+        // default values based on inspecting VPP's CLI and make test code
+        request.mrClassifyTableIndex = -1;
+        request.mrNextHopProto = MPLS_PROTOCOL;
+        request.mrNextHopWeight = 1;
+        request.mrNextHop = new byte[0]; // no next hop since we POP
+        request.mrNextHopOutLabelStack = new int[0]; // no new labels
+        request.mrNextHopSwIfIndex = -1;
+        request.mrNextHopViaLabel = MPLS_LABEL_INVALID;
+
+        getReplyForWrite(vppApi.mplsRouteAddDel(request).toCompletableFuture(), id);
+    }
+
+    private void translate(@Nonnull final MplsRouteAddDel request, @Nonnull final Config config) {
+        final InSegment inSegment = config.getInSegment();
+        checkArgument(inSegment != null, "Configuring mpls pop-and-lookup, but in-segment is missing.");
+
+        checkArgument(inSegment.getType() instanceof MplsLabel, "Expecting mpls-label in-segment type, but %s given.",
+            inSegment.getType());
+        final Long label = ((MplsLabel) inSegment.getType()).getIncomingLabel().getValue();
+        request.mrLabel = label.intValue();
+    }
+
+    private void translate(@Nonnull final MplsRouteAddDel request,
+                           @Nonnull final StaticLspVppLookupAugmentation vppLabelLookup) {
+        // MPLS lookup for the last label is not valid operation (there is no next label to lookup),
+        // so match only labels without EOS bit set:
+        request.mrEos = 0;
+        final Long mplsLookupInTable = vppLabelLookup.getLabelLookup().getMplsLookupInTable();
+        checkArgument(mplsLookupInTable != null,
+            "Configuring pop and mpls lookup, but MPLS lookup table was not given");
+        request.mrNextHopTableId = mplsLookupInTable.intValue();
+    }
+}