ionic: Add netdev-event handling

When the netdev gets a new name from userland, pass that name
down to the NIC for internal tracking.

Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/pensando/ionic/ionic.h

@@ -44,6 +44,8 @@ struct ionic {
 	DECLARE_BITMAP(lifbits, IONIC_LIFS_MAX);
 	unsigned int nintrs;
 	DECLARE_BITMAP(intrs, IONIC_INTR_CTRL_REGS_MAX);
+	struct work_struct nb_work;
+	struct notifier_block nb;
 };
 
 struct ionic_admin_ctx {

drivers/net/ethernet/pensando/ionic/ionic_lif.c

@@ -1955,10 +1955,66 @@ int ionic_lifs_init(struct ionic *ionic)
 	return 0;
 }
 
+static void ionic_lif_notify_work(struct work_struct *ws)
+{
+}
+
+static void ionic_lif_set_netdev_info(struct ionic_lif *lif)
+{
+	struct ionic_admin_ctx ctx = {
+		.work = COMPLETION_INITIALIZER_ONSTACK(ctx.work),
+		.cmd.lif_setattr = {
+			.opcode = IONIC_CMD_LIF_SETATTR,
+			.index = cpu_to_le16(lif->index),
+			.attr = IONIC_LIF_ATTR_NAME,
+		},
+	};
+
+	strlcpy(ctx.cmd.lif_setattr.name, lif->netdev->name,
+		sizeof(ctx.cmd.lif_setattr.name));
+
+	ionic_adminq_post_wait(lif, &ctx);
+}
+
+static struct ionic_lif *ionic_netdev_lif(struct net_device *netdev)
+{
+	if (!netdev || netdev->netdev_ops->ndo_start_xmit != ionic_start_xmit)
+		return NULL;
+
+	return netdev_priv(netdev);
+}
+
+static int ionic_lif_notify(struct notifier_block *nb,
+			    unsigned long event, void *info)
+{
+	struct net_device *ndev = netdev_notifier_info_to_dev(info);
+	struct ionic *ionic = container_of(nb, struct ionic, nb);
+	struct ionic_lif *lif = ionic_netdev_lif(ndev);
+
+	if (!lif || lif->ionic != ionic)
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case NETDEV_CHANGENAME:
+		ionic_lif_set_netdev_info(lif);
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
 int ionic_lifs_register(struct ionic *ionic)
 {
 	int err;
 
+	INIT_WORK(&ionic->nb_work, ionic_lif_notify_work);
+
+	ionic->nb.notifier_call = ionic_lif_notify;
+
+	err = register_netdevice_notifier(&ionic->nb);
+	if (err)
+		ionic->nb.notifier_call = NULL;
+
 	/* only register LIF0 for now */
 	err = register_netdev(ionic->master_lif->netdev);
 	if (err) {
@@ -1974,6 +2030,12 @@ int ionic_lifs_register(struct ionic *ionic)
 
 void ionic_lifs_unregister(struct ionic *ionic)
 {
+	if (ionic->nb.notifier_call) {
+		unregister_netdevice_notifier(&ionic->nb);
+		cancel_work_sync(&ionic->nb_work);
+		ionic->nb.notifier_call = NULL;
+	}
+
 	/* There is only one lif ever registered in the
 	 * current model, so don't bother searching the
 	 * ionic->lif for candidates to unregister