| /* |
| * Copyright 2017-present Open Networking Foundation |
| * |
| * 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 org.onosproject.drivers.barefoot; |
| |
| import com.google.common.collect.Lists; |
| import org.apache.commons.io.IOUtils; |
| import org.onosproject.drivers.p4runtime.AbstractP4RuntimePipelineProgrammable; |
| import org.onosproject.net.behaviour.PiPipelineProgrammable; |
| import org.onosproject.net.pi.model.PiPipeconf; |
| import org.onosproject.net.pi.model.PiPipeconf.ExtensionType; |
| |
| import java.io.IOException; |
| import java.nio.Buffer; |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| import java.nio.charset.StandardCharsets; |
| import java.util.List; |
| import java.util.Optional; |
| |
| import static org.onosproject.net.pi.model.PiPipeconf.ExtensionType.TOFINO_BIN; |
| import static org.onosproject.net.pi.model.PiPipeconf.ExtensionType.TOFINO_CONTEXT_JSON; |
| |
| /** |
| * Implementation of the PiPipelineProgrammable behaviour for a Tofino-based switch. |
| */ |
| public class TofinoPipelineProgrammable |
| extends AbstractP4RuntimePipelineProgrammable |
| implements PiPipelineProgrammable { |
| |
| @Override |
| public Optional<PiPipeconf> getDefaultPipeconf() { |
| return Optional.empty(); |
| } |
| |
| @Override |
| public ByteBuffer createDeviceDataBuffer(PiPipeconf pipeconf) { |
| |
| List<ByteBuffer> buffers = Lists.newLinkedList(); |
| try { |
| buffers.add(nameBuffer(pipeconf)); |
| buffers.add(extensionBuffer(pipeconf, TOFINO_BIN)); |
| buffers.add(extensionBuffer(pipeconf, TOFINO_CONTEXT_JSON)); |
| } catch (ExtensionException e) { |
| return null; |
| } |
| |
| // Concatenate buffers (flip so they can be read). |
| int len = buffers.stream().mapToInt(Buffer::limit).sum(); |
| ByteBuffer deviceData = ByteBuffer.allocate(len); |
| buffers.forEach(b -> deviceData.put((ByteBuffer) b.flip())); |
| deviceData.flip(); |
| |
| return deviceData.asReadOnlyBuffer(); |
| } |
| |
| private ByteBuffer nameBuffer(PiPipeconf pipeconf) { |
| // Length of the name + name. |
| String name = pipeconf.id().toString(); |
| return ByteBuffer.allocate(Integer.BYTES + name.length()) |
| .order(ByteOrder.LITTLE_ENDIAN) |
| .putInt(name.length()) |
| .put(name.getBytes(StandardCharsets.UTF_8)); |
| } |
| |
| private ByteBuffer extensionBuffer(PiPipeconf pipeconf, ExtensionType extType) { |
| if (!pipeconf.extension(extType).isPresent()) { |
| log.warn("Missing extension {} in pipeconf {}", extType, pipeconf.id()); |
| throw new ExtensionException(); |
| } |
| try { |
| byte[] bytes = IOUtils.toByteArray(pipeconf.extension(extType).get()); |
| // Length of the extension + bytes. |
| return ByteBuffer.allocate(Integer.BYTES + bytes.length) |
| .order(ByteOrder.LITTLE_ENDIAN) |
| .putInt(bytes.length) |
| .put(bytes); |
| } catch (IOException ex) { |
| log.warn("Unable to read extension {} from pipeconf {}: {}", |
| extType, pipeconf.id(), ex.getMessage()); |
| throw new ExtensionException(); |
| } |
| } |
| |
| private static class ExtensionException extends IllegalArgumentException { |
| } |
| } |