netdev - Re: [PATCH] netdev: generate kobject uevent on network state transitions

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Date:	Mon, 24 Nov 2008 20:14:40 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Marcel Holtmann <marcel@...tmann.org>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	Kay Sievers <kay.sievers@...y.org>,
	David Miller <davem@...emloft.net>,
	linux-hotplug@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] netdev: generate kobject uevent on network state
 transitions

On Tue, 25 Nov 2008 04:51:53 +0100
Marcel Holtmann <marcel@...tmann.org> wrote:

> Hi Stephen,
> 
> > It is easier for some applications to deal with text based interfaces
> > like uevent, rather than using netlink to listen for events.
> >
> > Note, this does not deal with network namespaces but that is a generic
> > problem that already exists with kobjects (see rename events).
> >
> > Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
> >
> > ---
> > net/core/Makefile |    1
> > net/core/uevent.c |   61 ++++++++++++++++++++++++++++++++++++++++++++ 
> > ++++++++++
> > 2 files changed, 62 insertions(+)
> >
> > --- a/net/core/Makefile	2008-11-24 12:07:18.000000000 -0800
> > +++ b/net/core/Makefile	2008-11-24 12:07:22.000000000 -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	2008-11-24 12:11:46.000000000 -0800
> > @@ -0,0 +1,55 @@
> > +/*
> > + * 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>
> > +
> > +/*
> > + * Generate uevent in response to network device state changes.
> > + * Other events are already handled by device subsystem.
> > + */
> > +static int netdev_event(struct notifier_block *this, unsigned long  
> > event, void *ptr)
> > +{
> > +	struct net_device *netdev = ptr;
> > +
> > +	switch (event) {
> > +	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: {
> > +		char str[64] = "DEVSTATE=UP";
> > +		char *envp[2] = { str, NULL };
> > +
> > +		if (netif_oper_up(netdev))
> > +			strcat(str, ",RUNNING");
> > +		if (netif_carrier_ok(netdev))
> > +			strcat(str, ",LOWER_UP");
> > +		if (netif_dormant(netdev))
> > +			strcat(str, ",DORMANT");
> > +		kobject_uevent_env(&netdev->dev.kobj, KOBJ_CHANGE, envp);
> > +		break;
> 
> do we wanna copy just what ifconfig shows or do we might be a more  
> intelligent and have separate variables like RUNNING=1 etc.?
> 
> Regards
> 
> Marcel

Was arbitrary choice to just use same flags as existing ifconfig.
What ever feels best I guess...

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