add gVNIC support for compute instance (#4443)

* add gVNIC support for compute instance

* add google_compute_instance_template & fix a panic

* Using a func to replace inline code

* add ga filter

* add beta in documents

mmv1/third_party/terraform/resources/resource_compute_instance.go.erb

@@ -297,7 +297,15 @@ func resourceComputeInstance() *schema.Resource {
 							Computed:    true,
 							Description: `The name of the interface`,
 						},
-
+<% unless version == 'ga' -%>
+						"nic_type": {
+							Type:     schema.TypeString,
+							Optional: true,
+							ForceNew:     true,
+							ValidateFunc: validation.StringInSlice([]string{"GVNIC", "VIRTIO_NET"}, false),
+							Description:  `The type of vNIC to be used on this interface. Possible values:GVNIC, VIRTIO_NET`,
+						},
+<% end -%>
 						"access_config": {
 							Type:        schema.TypeList,
 							Optional:    true,

mmv1/third_party/terraform/resources/resource_compute_instance_template.go.erb

@@ -330,7 +330,15 @@ func resourceComputeInstanceTemplate() *schema.Resource {
 							Computed:    true,
 							Description: `The name of the network_interface.`,
 						},
-
+<% unless version == 'ga' -%>
+						"nic_type": {
+							Type:     schema.TypeString,
+							Optional: true,
+							ForceNew:     true,
+							ValidateFunc: validation.StringInSlice([]string{"GVNIC", "VIRTIO_NET"}, false),
+							Description:  `The type of vNIC to be used on this interface. Possible values:GVNIC, VIRTIO_NET`,
+						},
+<% end -%>
 						"access_config": {
 							Type:        schema.TypeList,
 							Optional:    true,

mmv1/third_party/terraform/tests/resource_compute_instance_test.go.erb

@@ -1052,6 +1052,36 @@ func TestAccComputeInstance_multiNic(t *testing.T) {
 		},
 	})
 }
+<% unless version == 'ga' -%>
+func TestAccComputeInstance_nictype_update(t *testing.T) {
+	t.Parallel()
+
+	var instance compute.Instance
+	var instanceName = fmt.Sprintf("tf-test-%s", randString(t, 10))
+
+	vcrTest(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: testAccCheckComputeInstanceDestroyProducer(t),
+		Steps: []resource.TestStep{
+			{
+				Config: testAccComputeInstance_nictype(instanceName, instanceName, "GVNIC"),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckComputeInstanceExists(
+						t, "google_compute_instance.foobar", &instance),
+				),
+			},
+			{
+				Config: testAccComputeInstance_nictype(instanceName, instanceName, "VIRTIO_NET"),
+				Check: resource.ComposeTestCheckFunc(
+					testAccCheckComputeInstanceExists(
+						t, "google_compute_instance.foobar", &instance),
+				),
+			},
+		},
+	})
+}
+<% end -%>
 
 func TestAccComputeInstance_guestAccelerator(t *testing.T) {
 	t.Parallel()
@@ -4140,6 +4170,63 @@ resource "google_compute_subnetwork" "inst-test-subnetwork" {
 `, instance, network, subnetwork)
 }
 
+<% unless version == 'ga' -%>
+func testAccComputeInstance_nictype(image, instance, nictype string) string {
+	return fmt.Sprintf(`
+resource "google_compute_image" "example" {
+	name = "%s"
+	raw_disk {
+		source = "https://storage.googleapis.com/bosh-gce-raw-stemcells/bosh-stemcell-97.98-google-kvm-ubuntu-xenial-go_agent-raw-1557960142.tar.gz"
+	}
+
+	guest_os_features {
+		type = "SECURE_BOOT"
+	}
+
+	guest_os_features {
+		type = "MULTI_IP_SUBNET"
+	}
+
+	guest_os_features {
+		type = "GVNIC"
+	}
+}
+
+resource "google_compute_instance" "foobar" {
+  name           = "%s"
+  machine_type   = "e2-medium"
+  zone           = "us-central1-a"
+  can_ip_forward = false
+  tags           = ["foo", "bar"]
+
+  //deletion_protection = false is implicit in this config due to default value
+
+  boot_disk {
+    initialize_params {
+	  image = google_compute_image.example.id
+    }
+  }
+
+  network_interface {
+	network = "default"
+	nic_type = "%s"
+  }
+
+  metadata = {
+    foo            = "bar"
+    baz            = "qux"
+    startup-script = "echo Hello"
+  }
+
+  labels = {
+    my_key       = "my_value"
+    my_other_key = "my_other_value"
+  }
+}
+`, image, instance, nictype)
+}
+<% end -%>
+
 func testAccComputeInstance_guestAccelerator(instance string, count uint8) string {
 	return fmt.Sprintf(`
 data "google_compute_image" "my_image" {

mmv1/third_party/terraform/utils/compute_instance_helpers.go.erb

@@ -192,6 +192,9 @@ func flattenNetworkInterfaces(d *schema.ResourceData, config *Config, networkInt
 			"subnetwork_project": subnet.Project,
 			"access_config":      ac,
 			"alias_ip_range":     flattenAliasIpRange(iface.AliasIpRanges),
+<% unless version == 'ga' -%>
+			"nic_type":           iface.NicType,
+<% end -%>
 		}
 		// Instance template interfaces never have names, so they're absent
 		// in the instance template network_interface schema. We want to use the
@@ -254,11 +257,22 @@ func expandNetworkInterfaces(d TerraformResourceData, config *Config) ([]*comput
 			Subnetwork:    sf.RelativeLink(),
 			AccessConfigs: expandAccessConfigs(data["access_config"].([]interface{})),
 			AliasIpRanges: expandAliasIpRanges(data["alias_ip_range"].([]interface{})),
+<% unless version == 'ga' -%>
+			NicType:       expandNicType(data["nic_type"].(interface{})),
+<% end -%>
 		}
 
 	}
 	return ifaces, nil
 }
+<% unless version == 'ga' -%>
+func expandNicType(d interface{}) string {
+	if d == nil {
+		return ""
+	}
+	return d.(string)
+}
+<% end -%>
 
 func flattenServiceAccounts(serviceAccounts []*computeBeta.ServiceAccount) []map[string]interface{} {
 	result := make([]map[string]interface{}, len(serviceAccounts))

mmv1/third_party/terraform/website/docs/r/compute_instance.html.markdown

@@ -276,6 +276,9 @@ The `network_interface` block supports:
     array of alias IP ranges for this network interface. Can only be specified for network
     interfaces on subnet-mode networks. Structure documented below.
 
+* `nic_type` - (Optional, [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html)) The type of vNIC to be used on this interface.
+    Possible values: GVNIC, VIRTIO_NET.
+
 The `access_config` block supports:
 
 * `nat_ip` - (Optional) The IP address that will be 1:1 mapped to the instance's

mmv1/third_party/terraform/website/docs/r/compute_instance_template.html.markdown

@@ -359,6 +359,9 @@ The `network_interface` block supports:
     array of alias IP ranges for this network interface. Can only be specified for network
     interfaces on subnet-mode networks. Structure documented below.
 
+* `nic_type` - (Optional, [Beta](https://terraform.io/docs/providers/google/guides/provider_versions.html)) The type of vNIC to be used on this interface.
+    Possible values: GVNIC, VIRTIO_NET.
+
 The `access_config` block supports:
 
 * `nat_ip` - (Optional) The IP address that will be 1:1 mapped to the instance's