1 files changed, 93 insertions, 0 deletions
diff --git a/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsSwapWriter.java b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsSwapWriter.java
new file mode 100644
index 000000000..8d834fe7c
--- /dev/null
+++ b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsSwapWriter.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.hc2vpp.common.translate.util.Ipv4Translator;
+import io.fd.hc2vpp.common.translate.util.NamingContext;
+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.inet.types.rev130715.IpAddress;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Address;
+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.OutSegment;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310._static.lsp_config.out.segment.SimplePath;
+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.ietf.params.xml.ns.yang.ietf.routing.types.rev170227.MplsLabel;
+import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
+
+/**
+ * Translates {@link StaticLspConfig.Operation#SwapAndForward} operation 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 MplsSwapWriter implements LspWriter, Ipv4Translator, MplsInSegmentTranslator {
+
+    private final FutureJVppCore vppApi;
+    private final NamingContext interfaceContext;
+
+    MplsSwapWriter(@Nonnull final FutureJVppCore vppApi, @Nonnull final NamingContext interfaceContext) {
+        this.vppApi = vppApi;
+        this.interfaceContext = interfaceContext;
+    }
+
+    @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);
+        request.mrEos = 1; // only SWAP for the last label in the stack is currently supported
+
+        translate(config.getInSegment(), request);
+        translate(config.getOutSegment(), request, ctx);
+
+        // default values based on inspecting VPP's CLI and make test code
+        request.mrClassifyTableIndex = -1;
+        request.mrNextHopWeight = 1;
+        request.mrNextHopViaLabel = MPLS_LABEL_INVALID;
+
+        getReplyForWrite(vppApi.mplsRouteAddDel(request).toCompletableFuture(), id);
+    }
+
+    private void translate(@Nonnull final OutSegment outSegment, @Nonnull final MplsRouteAddDel request,
+                           @Nonnull final MappingContext ctx) {
+        checkArgument(outSegment instanceof SimplePath, "Unsupported out-segment type: %s", outSegment);
+        final SimplePath path = (SimplePath) outSegment;
+        final IpAddress nextHop = path.getNextHop();
+        checkArgument(nextHop != null, "Configuring swap-and-forward, but next-hop is missing.");
+
+        // TODO(HC2VPP-264): add support for mpls + v6
+        final Ipv4Address address = nextHop.getIpv4Address();
+        checkArgument(address != null, "Only IPv4 next-hop address is supported.");
+        request.mrNextHop = ipv4AddressNoZoneToArray(address.getValue());
+
+        final MplsLabel outgoingLabel = path.getOutgoingLabel();
+        checkArgument(outgoingLabel != null, "Configuring swap-and-forward, but outgoing-label is missing.");
+        request.mrNextHopOutLabelStack = new int[] {outgoingLabel.getValue().intValue()};
+        request.mrNextHopNOutLabels = 1;
+
+        final String outgoingInterface = path.getOutgoingInterface();
+        checkArgument(outgoingInterface != null, "Configuring swap-and-forward, but outgoing-interface is missing.");
+        request.mrNextHopSwIfIndex = interfaceContext.getIndex(outgoingInterface, ctx);
+    }
+}