add network update support

ibm/service/power/resource_ibm_pi_network.go

@@ -34,6 +34,7 @@ func ResourceIBMPINetwork() *schema.Resource {
 
 		Timeouts: &schema.ResourceTimeout{
 			Create: schema.DefaultTimeout(60 * time.Minute),
+			Update: schema.DefaultTimeout(60 * time.Minute),
 			Delete: schema.DefaultTimeout(60 * time.Minute),
 		},
 
@@ -181,7 +182,37 @@ func resourceIBMPINetworkRead(ctx context.Context, d *schema.ResourceData, meta
 }
 
 func resourceIBMPINetworkUpdate(ctx context.Context, d *schema.ResourceData, meta interface{}) diag.Diagnostics {
-	return nil
+	sess, err := meta.(conns.ClientSession).IBMPISession()
+	if err != nil {
+		return diag.FromErr(err)
+	}
+
+	cloudInstanceID, networkID, err := splitID(d.Id())
+	if err != nil {
+		return diag.FromErr(err)
+	}
+
+	gateway := d.Get(helpers.PINetworkGateway).(string)
+	networkdns := flex.ExpandStringList((d.Get(helpers.PINetworkDNS).(*schema.Set)).List())
+	networkC := st.NewIBMPINetworkClient(ctx, sess, cloudInstanceID)
+
+	//update body
+	body := &models.NetworkUpdate{}
+	body.Gateway = &gateway
+	body.DNSServers = networkdns
+
+	// check for name change
+	if d.HasChange(helpers.PINetworkName) {
+		name := d.Get(helpers.PINetworkName).(string)
+		body.Name = &name
+	}
+
+	_, err = networkC.Update(networkID, body)
+	if err != nil {
+		return diag.Errorf("failed to update network name: %v", err)
+	}
+
+	return resourceIBMPINetworkRead(ctx, d, meta)
 }
 
 func resourceIBMPINetworkDelete(ctx context.Context, d *schema.ResourceData, meta interface{}) diag.Diagnostics {

website/docs/r/pi_network.html.markdown

@@ -44,6 +44,7 @@ resource "ibm_pi_network" "power_networks" {
 The `ibm_pi_network` provides the following [Timeouts](https://www.terraform.io/docs/language/resources/syntax.html) configuration options:
 
 - **create** - (Default 60 minutes) Used for creating a network.
+- **update** - (Default 60 minutes) Used for updating a network.
 - **delete** - (Default 60 minutes) Used for deleting a network.
 
 ## Argument reference