gve: Implement suspend/resume/shutdown

Add support for suspend, resume and shutdown.
Signed-off-by: Catherine Sullivan <csully@google.com>
Signed-off-by: David Awogbemila <awogbemila@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/google/gve/gve.h

@@ -557,6 +557,8 @@ struct gve_priv {
 	u32 page_alloc_fail; /* count of page alloc fails */
 	u32 dma_mapping_error; /* count of dma mapping errors */
 	u32 stats_report_trigger_cnt; /* count of device-requested stats-reports since last reset */
+	u32 suspend_cnt; /* count of times suspended */
+	u32 resume_cnt; /* count of times resumed */
 	struct workqueue_struct *gve_wq;
 	struct work_struct service_task;
 	struct work_struct stats_report_task;
@@ -573,6 +575,7 @@ struct gve_priv {
 
 	/* Gvnic device link speed from hypervisor. */
 	u64 link_speed;
+	bool up_before_suspend; /* True if dev was up before suspend */
 
 	struct gve_options_dqo_rda options_dqo_rda;
 	struct gve_ptype_lut *ptype_lut_dqo;

drivers/net/ethernet/google/gve/gve_main.c

@@ -1676,6 +1676,58 @@ static void gve_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
+static void gve_shutdown(struct pci_dev *pdev)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct gve_priv *priv = netdev_priv(netdev);
+	bool was_up = netif_carrier_ok(priv->dev);
+
+	rtnl_lock();
+	if (was_up && gve_close(priv->dev)) {
+		/* If the dev was up, attempt to close, if close fails, reset */
+		gve_reset_and_teardown(priv, was_up);
+	} else {
+		/* If the dev wasn't up or close worked, finish tearing down */
+		gve_teardown_priv_resources(priv);
+	}
+	rtnl_unlock();
+}
+
+#ifdef CONFIG_PM
+static int gve_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct gve_priv *priv = netdev_priv(netdev);
+	bool was_up = netif_carrier_ok(priv->dev);
+
+	priv->suspend_cnt++;
+	rtnl_lock();
+	if (was_up && gve_close(priv->dev)) {
+		/* If the dev was up, attempt to close, if close fails, reset */
+		gve_reset_and_teardown(priv, was_up);
+	} else {
+		/* If the dev wasn't up or close worked, finish tearing down */
+		gve_teardown_priv_resources(priv);
+	}
+	priv->up_before_suspend = was_up;
+	rtnl_unlock();
+	return 0;
+}
+
+static int gve_resume(struct pci_dev *pdev)
+{
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct gve_priv *priv = netdev_priv(netdev);
+	int err;
+
+	priv->resume_cnt++;
+	rtnl_lock();
+	err = gve_reset_recovery(priv, priv->up_before_suspend);
+	rtnl_unlock();
+	return err;
+}
+#endif /* CONFIG_PM */
+
 static const struct pci_device_id gve_id_table[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_GOOGLE, PCI_DEV_ID_GVNIC) },
 	{ }
@@ -1686,6 +1738,11 @@ static struct pci_driver gvnic_driver = {
 	.id_table	= gve_id_table,
 	.probe		= gve_probe,
 	.remove		= gve_remove,
+	.shutdown	= gve_shutdown,
+#ifdef CONFIG_PM
+	.suspend        = gve_suspend,
+	.resume         = gve_resume,
+#endif
 };
 
 module_pci_driver(gvnic_driver);