netdev - Re: [PATCH] netdev: generate kobject uevent on network events.

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Message-ID: <20081124120645.417ea6e7@extreme>
Date:	Mon, 24 Nov 2008 12:06:45 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	"Kay Sievers" <kay.sievers@...y.org>
Cc:	"David Miller" <davem@...emloft.net>,
	"Marcel Holtmann" <marcel@...tmann.org>,
	linux-hotplug@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] netdev: generate kobject uevent on network events.

On Mon, 24 Nov 2008 20:55:02 +0100
"Kay Sievers" <kay.sievers@...y.org> wrote:

> On Mon, Nov 24, 2008 at 20:45, Stephen Hemminger <shemminger@...tta.com> wrote:
> > 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 08:40:10.000000000 -0800
> > +++ b/net/core/Makefile 2008-11-24 08:51:01.000000000 -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 09:06:50.000000000 -0800
> > @@ -0,0 +1,60 @@
> > +/*
> > + * 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 nework device changes.
> > + * NB: KOBJ_MOVE is already genereated by kobject_rename
> > + */
> > +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;
> 
> Did you do anything else to prevent the duplicated add/remove events?
> The core does send these already. I replied with a "udevadm monitor"
> output to your earlier mail. Don't you see the duplicates on your box?
> 
> Thanks,
> Kay

okay, then i'll just take it out of here.
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