Add VFIO client stub

Signed-off-by: Vladimir Popov <vladimir.popov@xored.com>

pkg/networkservice/mechanisms/vfio/client.go

@@ -14,6 +14,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// +build !windows
+
 // Package vfio provides VFIO client chain element
 package vfio
 

pkg/networkservice/mechanisms/vfio/client_test.go

@@ -14,6 +14,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+// +build !windows
+
 package vfio_test
 
 import (

pkg/networkservice/mechanisms/vfio/client_windows.go

@@ -0,0 +1,42 @@
+// Copyright (c) 2020 Doc.ai and/or its affiliates.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// 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 vfio provides VFIO client chain element
+package vfio
+
+import (
+	"github.com/golang/protobuf/ptypes/empty"
+	"github.com/pkg/errors"
+	"google.golang.org/grpc"
+
+	"github.com/networkservicemesh/api/pkg/api/networkservice"
+	"github.com/networkservicemesh/sdk/pkg/networkservice/core/next"
+)
+
+type vfioClient struct{}
+
+// NewClient - returns a new VFIO client chain element
+func NewClient(_ context.Context, _ string) networkservice.NetworkServiceClient {
+	return &vfioClient{}
+}
+
+func (c *vfioClient) Request(_ context.Context, _ *networkservice.NetworkServiceRequest, _ ...grpc.CallOption) (*networkservice.Connection, error) {
+	return nil, errors.New("VFIO is not supported for Windows")
+}
+
+func (c *vfioClient) Close(ctx context.Context, conn *networkservice.Connection, opts ...grpc.CallOption) (*empty.Empty, error) {
+	return next.Client(ctx).Close(ctx, conn, opts...)
+}