infiniband: remove the partitions on unrealizing

The infiniband drivers don't implement the rtnetlink link deletions.
Therefore we unrealize the NMDevice instance but the backing resources
stay around, preventing us from ever realizing the device again.

src/devices/nm-device-infiniband.c

@@ -42,6 +42,7 @@ G_DEFINE_TYPE (NMDeviceInfiniband, nm_device_infiniband, NM_TYPE_DEVICE)
 
 typedef struct {
 	gboolean is_partition;
+	int parent_ifindex, p_key;
 } NMDeviceInfinibandPrivate;
 
 enum {
@@ -235,16 +236,16 @@ create_and_realize (NMDevice *device,
                     const NMPlatformLink **out_plink,
                     GError **error)
 {
+	NMDeviceInfinibandPrivate *priv = NM_DEVICE_INFINIBAND_GET_PRIVATE (device);
 	NMSettingInfiniband *s_infiniband;
-	int parent_ifindex, p_key;
 	NMPlatformError plerr;
 
 	s_infiniband = nm_connection_get_setting_infiniband (connection);
 	g_assert (s_infiniband);
 
 	/* Can only create partitions at this time */
-	p_key = nm_setting_infiniband_get_p_key (s_infiniband);
-	if (p_key < 0) {
+	priv->p_key = nm_setting_infiniband_get_p_key (s_infiniband);
+	if (priv->p_key < 0) {
 		g_set_error_literal (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
 		                     "only InfiniBand partitions can be created");
 		return FALSE;
@@ -263,15 +264,15 @@ create_and_realize (NMDevice *device,
 		return FALSE;
 	}
 
-	parent_ifindex = nm_device_get_ifindex (parent);
-	if (parent_ifindex <= 0) {
+	priv->parent_ifindex = nm_device_get_ifindex (parent);
+	if (priv->parent_ifindex <= 0) {
 		g_set_error (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
 		             "failed to get InfiniBand parent %s ifindex",
 		             nm_device_get_iface (parent));
 		return FALSE;
 	}
 
-	plerr = nm_platform_link_infiniband_add (NM_PLATFORM_GET, parent_ifindex, p_key, out_plink);
+	plerr = nm_platform_link_infiniband_add (NM_PLATFORM_GET, priv->parent_ifindex, priv->p_key, out_plink);
 	if (plerr != NM_PLATFORM_ERROR_SUCCESS) {
 		g_set_error (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_CREATION_FAILED,
 		             "Failed to create InfiniBand P_Key interface '%s' for '%s': %s",
@@ -281,7 +282,33 @@ create_and_realize (NMDevice *device,
 		return FALSE;
 	}
 
-	NM_DEVICE_INFINIBAND_GET_PRIVATE (device)->is_partition = TRUE;
+	priv->is_partition = TRUE;
+	return TRUE;
+}
+
+static gboolean
+unrealize (NMDevice *device, GError **error)
+{
+	NMDeviceInfinibandPrivate *priv = NM_DEVICE_INFINIBAND_GET_PRIVATE (device);
+	NMPlatformError plerr;
+
+	g_return_val_if_fail (NM_IS_DEVICE_INFINIBAND (device), FALSE);
+
+	if (priv->p_key < 0) {
+		g_set_error (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_FAILED,
+		             "Only InfiniBand partitions can be removed");
+		return FALSE;
+	}
+
+	plerr = nm_platform_link_infiniband_delete (NM_PLATFORM_GET, priv->parent_ifindex, priv->p_key);
+	if (plerr != NM_PLATFORM_ERROR_SUCCESS) {
+		g_set_error (error, NM_DEVICE_ERROR, NM_DEVICE_ERROR_CREATION_FAILED,
+		             "Failed to remove InfiniBand P_Key interface '%s': %s",
+		             nm_device_get_iface (device),
+		             nm_platform_error_to_string (plerr));
+		return FALSE;
+	}
+
 	return TRUE;
 }
 
@@ -335,6 +362,7 @@ nm_device_infiniband_class_init (NMDeviceInfinibandClass *klass)
 	object_class->set_property = set_property;
 
 	parent_class->create_and_realize = create_and_realize;
+	parent_class->unrealize = unrealize;
 	parent_class->get_generic_capabilities = get_generic_capabilities;
 	parent_class->check_connection_compatible = check_connection_compatible;
 	parent_class->complete_connection = complete_connection;

src/devices/nm-device.c

@@ -2138,8 +2138,12 @@ nm_device_unrealize (NMDevice *self, gboolean remove_resources, GError **error)
 	_LOGD (LOGD_DEVICE, "unrealize (ifindex %d)", ifindex > 0 ? ifindex : 0);
 
 	if (remove_resources) {
-		if (ifindex > 0)
+		if (NM_DEVICE_GET_CLASS (self)->unrealize) {
+			if (!NM_DEVICE_GET_CLASS (self)->unrealize (self, error))
+				return FALSE;
+		} else if (ifindex > 0) {
 			nm_platform_link_delete (NM_PLATFORM_GET, ifindex);
+		}
 	}
 
 	NM_DEVICE_GET_CLASS (self)->unrealize_notify (self);

src/devices/nm-device.h

@@ -179,6 +179,14 @@ typedef struct {
 	 */
 	void        (*realize_start_notify) (NMDevice *self, const NMPlatformLink *plink);
 
+	/**
+	 * unrealize():
+	 * @self: the #NMDevice
+	 *
+	 * Remove the device backing resources.
+	 */
+	gboolean               (*unrealize) (NMDevice *self, GError **error);
+
 	/**
 	 * unrealize_notify():
 	 * @self: the #NMDevice