netdev - [RFC] network devices generating uevents?

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Message-ID: <20081121134659.5b305b5c@extreme>
Date:	Fri, 21 Nov 2008 13:46:59 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	netdev@...r.kernel.org
Subject: [RFC] network devices generating uevents?

Perhaps the following would make it easier for applications to
track network device events without having to use netlink.
Compile tested only so far. The implementation is almost trivial...

--- a/net/core/Makefile	2008-11-21 12:25:31.000000000 -0800
+++ b/net/core/Makefile	2008-11-21 13:32:30.000000000 -0800
@@ -17,3 +17,4 @@ obj-$(CONFIG_NET_PKTGEN) += pktgen.o
 obj-$(CONFIG_NETPOLL) += netpoll.o
 obj-$(CONFIG_NET_DMA) += user_dma.o
 obj-$(CONFIG_FIB_RULES) += fib_rules.o
+obj-$(CONFIG_HOTPLUG) += uevent.o
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ b/net/core/uevent.c	2008-11-21 13:42:13.000000000 -0800
@@ -0,0 +1,45 @@
+/*
+ * Linux network device event notification
+ *
+ * Author:
+ *	Stephen Hemminger <shemminger@...tta.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/kobject.h>
+#include <linux/notifier.h>
+
+static int netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
+{
+	struct net_device *netdev = ptr;
+
+	switch (event) {
+	case NETDEV_UNREGISTER:
+		kobject_uevent(&netdev->dev.kobj, KOBJ_REMOVE);
+		break;
+	case NETDEV_REGISTER:
+		kobject_uevent(&netdev->dev.kobj, KOBJ_ADD);
+		break;
+	case NETDEV_UP:
+		kobject_uevent(&netdev->dev.kobj, KOBJ_ONLINE);
+		break;
+	case NETDEV_DOWN:
+		kobject_uevent(&netdev->dev.kobj, KOBJ_OFFLINE);
+		break;
+	case NETDEV_CHANGE:
+		kobject_uevent(&netdev->dev.kobj, KOBJ_CHANGE);
+		break;
+	}
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block netdev_uevent_notifier = {
+	.notifier_call	= netdev_event,
+};
+
+static int __init netdev_uevent_init(void)
+{
+	return register_netdevice_notifier(&netdev_uevent_notifier);
+}
+device_initcall(netdev_uevent_init);
--
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