HC2VPP-259: add support for mpls swap-and-forward

Limitations:
- only IPv4 next hop address
- swap is supported only for the last label in the stack
- only single outgoing label is supported.

Change-Id: I9479e3d322561ed94683bd206e7e7852250d788c
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

6 files changed, 211 insertions, 83 deletions

diff --git a/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/ImposeAndForwardWriter.java b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/ImposeAndForwardWriter.java
index b7ac96735..14053b63d 100644
--- a/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/ImposeAndForwardWriter.java
+++ b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/ImposeAndForwardWriter.java
@@ -27,11 +27,13 @@ import io.fd.vpp.jvpp.core.future.FutureJVppCore;
 import java.util.List;
 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.inet.types.rev130715.Ipv4Prefix;
 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310.StaticLspConfig.Operation;
 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.OutSegment;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310._static.lsp_config.in.segment.Type;
 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310._static.lsp_config.in.segment.type.IpPrefix;
 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310._static.lsp_config.out.segment.PathList;
 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310._static.lsp_config.out.segment.SimplePath;
@@ -60,64 +62,80 @@ final class ImposeAndForwardWriter implements LspWriter, Ipv4Translator {
         final Config config = data.getConfig();
         final IpAddDelRoute request = new IpAddDelRoute();
         request.isAdd = booleanToByte(isAdd);
-        request.nextHopWeight = 1; // default value used in make test
 
-        final InSegment inSegment = config.getInSegment();
-        checkArgument(inSegment != null, "Configuring impose-and-forward, but in-segment is missing.");
+        translate(config.getInSegment(), request);
+        translate(config.getOutSegment(), request, ctx);
+
+        // default values based on inspecting VPP's CLI and make test code
+        request.nextHopWeight = 1;
+        request.nextHopViaLabel = MPLS_LABEL_INVALID;
+
+        getReplyForWrite(vppApi.ipAddDelRoute(request).toCompletableFuture(), id);
+    }
 
-        checkArgument(inSegment.getType() instanceof IpPrefix, "Only ip-prefix type is supported, but %s given.",
-            inSegment.getType());
-        final Ipv4Prefix prefix = ((IpPrefix) inSegment.getType()).getIpPrefix().getIpv4Prefix();
+    private void translate(@Nonnull final InSegment inSegment, @Nonnull final IpAddDelRoute request) {
+        checkArgument(inSegment != null, "Configuring impose-and-forward, but in-segment is missing.");
+        final Type type = inSegment.getType();
+        checkArgument(type instanceof IpPrefix, "Only ip-prefix type is supported, but %s given.", type);
 
         // TODO(HC2VPP-264): add support for mpls + v6
+        final Ipv4Prefix prefix = ((IpPrefix) type).getIpPrefix().getIpv4Prefix();
         request.dstAddressLength = extractPrefix(prefix);
         request.dstAddress = ipv4AddressPrefixToArray(prefix);
+    }
 
-        final OutSegment outSegment = config.getOutSegment();
+    private void translate(@Nonnull final OutSegment outSegment, @Nonnull final IpAddDelRoute request,
+                           @Nonnull final MappingContext ctx) {
         checkArgument(outSegment != null, "Configuring impose-and-forward, but out-segment is missing.");
-        translateOutSegment(outSegment, request, ctx);
-        getReplyForWrite(vppApi.ipAddDelRoute(request).toCompletableFuture(), id);
-    }
 
-    private void translateOutSegment(@Nonnull final OutSegment outSegment, @Nonnull final IpAddDelRoute request,
-                                     @Nonnull final MappingContext ctx) {
         final String outgoingInterface;
         if (outSegment instanceof SimplePath) {
-            final SimplePath path = (SimplePath) outSegment;
-            outgoingInterface = path.getOutgoingInterface();
-            final IpAddress nextHop = path.getNextHop();
-            checkArgument(nextHop != null, "Configuring impose-and-forward, but next-hop is missing.");
-            // TODO(HC2VPP-264): add support for mpls + v6
-            checkArgument(nextHop.getIpv4Address() != null, "Only IPv4 next-hop address is supported.");
-            request.nextHopAddress = ipv4AddressNoZoneToArray(nextHop.getIpv4Address().getValue());
-            request.nextHopNOutLabels = 1;
-            checkArgument(path.getOutgoingLabel() != null,
-                "Configuring impose-and-forward, but outgoing-label is missing.");
-            request.nextHopOutLabelStack = new int[] {path.getOutgoingLabel().getValue().intValue()};
+            outgoingInterface = translate((SimplePath) outSegment, request);
         } else if (outSegment instanceof PathList) {
-            final PathList pathList = (PathList) outSegment;
-            checkArgument(pathList.getPaths() != null && pathList.getPaths().size() == 1,
-                "Only single path is supported");
-            final Paths paths = pathList.getPaths().get(0);
-            outgoingInterface = paths.getOutgoingInterface();
-            // TODO(HC2VPP-264): add support for mpls + v6
-            final IpAddress nextHop = paths.getNextHop();
-            checkArgument(nextHop != null, "Configuring impose-and-forward, but next-hop is missing.");
-            checkArgument(nextHop.getIpv4Address() != null, "Only IPv4 next-hop address is supported.");
-            request.nextHopAddress = ipv4AddressNoZoneToArray(nextHop.getIpv4Address().getValue());
-            final List<MplsLabel> outgoingLabels = paths.getOutgoingLabels();
-            final int numberOfLabels = outgoingLabels.size();
-            checkArgument(numberOfLabels > 0 && numberOfLabels < MAX_LABELS,
-                "Number of labels (%s) not in range (0, %s].", numberOfLabels, MAX_LABELS, numberOfLabels);
-            request.nextHopNOutLabels = (byte) numberOfLabels;
-            request.nextHopOutLabelStack =
-                outgoingLabels.stream().mapToInt(label -> label.getValue().intValue()).toArray();
+            outgoingInterface = translate((PathList) outSegment, request);
         } else {
             throw new IllegalArgumentException("Unsupported out-segment type: " + outSegment);
         }
 
         checkArgument(outgoingInterface != null, "Configuring impose-and-forward, but outgoing-interface is missing.");
         request.nextHopSwIfIndex = interfaceContext.getIndex(outgoingInterface, ctx);
-        request.nextHopViaLabel = MPLS_LABEL_INVALID;
+    }
+
+    private String translate(@Nonnull final SimplePath path, @Nonnull final IpAddDelRoute request) {
+        final IpAddress nextHop = path.getNextHop();
+        checkArgument(nextHop != null, "Configuring impose-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.nextHopAddress = ipv4AddressNoZoneToArray(address.getValue());
+
+        final MplsLabel outgoingLabel = path.getOutgoingLabel();
+        checkArgument(outgoingLabel != null, "Configuring impose-and-forward, but outgoing-label is missing.");
+        request.nextHopOutLabelStack = new int[] {outgoingLabel.getValue().intValue()};
+        request.nextHopNOutLabels = 1;
+
+        return path.getOutgoingInterface();
+    }
+
+    private String translate(@Nonnull final PathList pathList, @Nonnull final IpAddDelRoute request) {
+        checkArgument(pathList.getPaths() != null && pathList.getPaths().size() == 1, "Only single path is supported");
+        final Paths paths = pathList.getPaths().get(0);
+        final IpAddress nextHop = paths.getNextHop();
+        checkArgument(nextHop != null, "Configuring impose-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.nextHopAddress = ipv4AddressNoZoneToArray(address.getValue());
+
+        final List<MplsLabel> labels = paths.getOutgoingLabels();
+        final int numberOfLabels = labels.size();
+        checkArgument(numberOfLabels > 0 && numberOfLabels < MAX_LABELS, "Number of labels (%s) not in range (0, %s].",
+            numberOfLabels, MAX_LABELS, numberOfLabels);
+        request.nextHopNOutLabels = (byte) numberOfLabels;
+        request.nextHopOutLabelStack = labels.stream().mapToInt(label -> label.getValue().intValue()).toArray();
+
+        return paths.getOutgoingInterface();
     }
 }
diff --git a/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/Ipv4LookupWriter.java b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/Ipv4LookupWriter.java
index 7ac164a96..94862c52b 100644
--- a/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/Ipv4LookupWriter.java
+++ b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/Ipv4LookupWriter.java
@@ -25,8 +25,6 @@ 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;
@@ -38,7 +36,7 @@ import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  *
  * @see <a href="https://git.fd.io/vpp/tree/src/vnet/mpls/mpls.api">mpls_route_add_del</a> definition
  */
-final class Ipv4LookupWriter implements LspWriter {
+final class Ipv4LookupWriter implements LspWriter, MplsInSegmentTranslator {
     private static final byte IPV4_PROTOCOL = (byte) LookupType.Ipv4.getIntValue();
 
     private final FutureJVppCore vppApi;
@@ -55,8 +53,8 @@ final class Ipv4LookupWriter implements LspWriter {
 
         request.mrIsAdd = booleanToByte(isAdd);
 
-        translate(request, config);
-        translate(request, config.getAugmentation(StaticLspVppLookupAugmentation.class));
+        translate(config.getInSegment(), request);
+        translate(config.getAugmentation(StaticLspVppLookupAugmentation.class), request);
 
         // default values based on inspecting VPP's CLI and make test code
         request.mrClassifyTableIndex = -1;
@@ -70,23 +68,12 @@ final class Ipv4LookupWriter implements LspWriter {
         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 ipv4 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) {
+    private void translate(@Nonnull final StaticLspVppLookupAugmentation vppLabelLookup,
+                           @Nonnull final MplsRouteAddDel request) {
         // IPv4 lookup should only happen if there is no more labels to process, so setting the EOS bit:
         request.mrEos = 1;
-        final Long lookupInTable = vppLabelLookup.getLabelLookup().getIp4LookupInTable();
-        checkArgument(lookupInTable != null,
-            "Configuring pop and ipv4 lookup, but ipv4 lookup table was not given");
-        request.mrNextHopTableId = lookupInTable.intValue();
+        final Long lookupTable = vppLabelLookup.getLabelLookup().getIp4LookupInTable();
+        checkArgument(lookupTable != null, "Configuring pop and ipv4 lookup, but ipv4 lookup table was not given");
+        request.mrNextHopTableId = lookupTable.intValue();
     }
 }
diff --git a/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsInSegmentTranslator.java b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsInSegmentTranslator.java
new file mode 100644
index 000000000..9f531bba4
--- /dev/null
+++ b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsInSegmentTranslator.java
@@ -0,0 +1,38 @@
+/*
+ * 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.vpp.jvpp.core.dto.MplsRouteAddDel;
+import javax.annotation.Nonnull;
+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;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310._static.lsp_config.in.segment.type.MplsLabel;
+
+/**
+ * Mixin that translates {@link InSegment} of {@link MplsLabel} type to {@link MplsRouteAddDel} message.
+ */
+interface MplsInSegmentTranslator {
+    default void translate(@Nonnull final InSegment inSegment, @Nonnull final MplsRouteAddDel request) {
+        checkArgument(inSegment != null, "Missing in-segment");
+        final Type type = inSegment.getType();
+        checkArgument(type instanceof MplsLabel, "Expecting in-segment of type mpls-label, but %s given.", type);
+        final Long label = ((MplsLabel) type).getIncomingLabel().getValue();
+        request.mrLabel = label.intValue();
+    }
+}
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
index c845c7aeb..d5d4872dc 100644
--- a/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsLookupWriter.java
+++ b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/MplsLookupWriter.java
@@ -25,8 +25,6 @@ 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;
@@ -38,7 +36,7 @@ import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  *
  * @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 {
+final class MplsLookupWriter implements LspWriter, MplsInSegmentTranslator {
     private static final byte MPLS_PROTOCOL = (byte) LookupType.Mpls.getIntValue();
 
     private final FutureJVppCore vppApi;
@@ -55,8 +53,8 @@ final class MplsLookupWriter implements LspWriter {
 
         request.mrIsAdd = booleanToByte(isAdd);
 
-        translate(request, config);
-        translate(request, config.getAugmentation(StaticLspVppLookupAugmentation.class));
+        translate(config.getInSegment(), request);
+        translate(config.getAugmentation(StaticLspVppLookupAugmentation.class), request);
 
         // default values based on inspecting VPP's CLI and make test code
         request.mrClassifyTableIndex = -1;
@@ -70,24 +68,13 @@ final class MplsLookupWriter implements LspWriter {
         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) {
+    private void translate(@Nonnull final StaticLspVppLookupAugmentation vppLabelLookup,
+                           @Nonnull final MplsRouteAddDel request) {
         // 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();
+        final Long lookupTable = vppLabelLookup.getLabelLookup().getMplsLookupInTable();
+        checkArgument(lookupTable != null, "Configuring pop and mpls lookup, but MPLS lookup table was not given");
+        request.mrNextHopTableId = lookupTable.intValue();
     }
 }
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);
+    }
+}
diff --git a/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/StaticLspCustomizer.java b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/StaticLspCustomizer.java
index 54653b9c1..d93e0343c 100644
--- a/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/StaticLspCustomizer.java
+++ b/mpls/impl/src/main/java/io/fd/hc2vpp/mpls/StaticLspCustomizer.java
@@ -20,6 +20,7 @@ import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
 import static org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310.StaticLspConfig.Operation.ImposeAndForward;
 import static org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310.StaticLspConfig.Operation.PopAndLookup;
+import static org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.mpls._static.rev170310.StaticLspConfig.Operation.SwapAndForward;
 
 import io.fd.hc2vpp.common.translate.util.NamingContext;
 import io.fd.honeycomb.translate.MappingContext;
@@ -47,6 +48,7 @@ final class StaticLspCustomizer implements ListWriterCustomizer<StaticLsp, Stati
     private final ImposeAndForwardWriter imposeAndForward;
     private final MplsLookupWriter mplsLookup;
     private final Ipv4LookupWriter ipv4Lookup;
+    private final MplsSwapWriter mplsSwap;
 
     StaticLspCustomizer(@Nonnull final FutureJVppCore vppApi, @Nonnull NamingContext interfaceContext) {
         checkNotNull(vppApi, "vppApi should not be null");
@@ -54,6 +56,7 @@ final class StaticLspCustomizer implements ListWriterCustomizer<StaticLsp, Stati
         this.imposeAndForward = new ImposeAndForwardWriter(vppApi, interfaceContext);
         this.mplsLookup = new MplsLookupWriter(vppApi);
         this.ipv4Lookup = new Ipv4LookupWriter(vppApi);
+        this.mplsSwap = new MplsSwapWriter(vppApi, interfaceContext);
     }
 
     @Override
@@ -94,6 +97,8 @@ final class StaticLspCustomizer implements ListWriterCustomizer<StaticLsp, Stati
             } else {
                 throw new IllegalArgumentException("Unsupported lookup type: " + type);
             }
+        } else if (SwapAndForward.equals(operation)) {
+            mplsSwap.write(id, data, ctx, isAdd);
         } else {
             throw new IllegalArgumentException("Unsupported operation: " + operation);
         }