netdev - RE: [PATCH net-next] net: print a notification on device rename

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Message-ID: <B5657A6538887040AD3A81F1008BEC63B0227D@avmb3.qlogic.org>
Date:	Mon, 21 Jul 2014 05:50:17 +0000
From:	Yuval Mintz <Yuval.Mintz@...gic.com>
To:	Veaceslav Falico <vfalico@...il.com>
CC:	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	"Eric Dumazet" <edumazet@...gle.com>,
	Vlad Yasevich <vyasevic@...hat.com>,
	"stephen hemminger" <stephen@...workplumber.org>,
	Jerry Chu <hkchu@...gle.com>,
	"Ben Hutchings" <bhutchings@...arflare.com>,
	David Laight <David.Laight@...LAB.COM>
Subject: RE: [PATCH net-next] net: print a notification on device rename

> Cc: netdev; David Miller; Eric Dumazet; Vlad Yasevich; stephen hemminger; Jerry
> Chu; Ben Hutchings; David Laight
> Subject: Re: [PATCH net-next] net: print a notification on device rename
>
> On Sun, Jul 20, 2014 at 12:37:52PM +0000, Yuval Mintz wrote:
> >> Currently it's done silently (from the kernel part), and thus it
> >> might be hard to track the renames from logs.
> >>
> >> Add a simple netdev_info() to notify the rename, but only in case the
> >> previous name was valid.
> >
> >Hi,
> >
> >Why you're at it, perhaps we could also consider adding an optional ndo
> >callback in the drivers to notify them of the device name change?
> >[e.g., multi-module dependencies where one would wish to inform the
> >others of the name change]
>
> There's already one, I think:
>
> 1142         ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
>
> It's also possible to block it. Or did you mean something else?
>

I wasn't aware of the notifier, but although usable I've meant an actual .ndo
to the device itself - under current implementation the device is oblivious to
changes to its own name, and it's only method of getting a notification is by
enlisting into the notifier chain and getting all sorts of notifications for all sort
of devices.

[You're right my example was probably covered by the current implementation]

Although it might be debatable whether the device should actually care about its
Name change.

> Thank you!
>
> >
> >Cheers,
> >Yuval
> >
> >>
> >> CC: "David S. Miller" <davem@...emloft.net>
> >> CC: Eric Dumazet <edumazet@...gle.com>
> >> CC: Vlad Yasevich <vyasevic@...hat.com>
> >> CC: stephen hemminger <stephen@...workplumber.org>
> >> CC: Jerry Chu <hkchu@...gle.com>
> >> CC: Ben Hutchings <bhutchings@...arflare.com>
> >> CC: David Laight <David.Laight@...LAB.COM>
> >> Signed-off-by: Veaceslav Falico <vfalico@...il.com>
> >> ---
> >>  net/core/dev.c | 3 +++
> >>  1 file changed, 3 insertions(+)
> >>
> >> diff --git a/net/core/dev.c b/net/core/dev.c index 239722a..d14ebf0
> >> 100644
> >> --- a/net/core/dev.c
> >> +++ b/net/core/dev.c
> >> @@ -1113,6 +1113,9 @@ int dev_change_name(struct net_device *dev,
> >> const char *newname)
> >>               return err;
> >>       }
> >>
> >> +     if (oldname[0] && !strchr(oldname, '%'))
> >> +             netdev_info(dev, "renamed from %s\n", oldname);
> >> +
> >>       old_assign_type = dev->name_assign_type;
> >>       dev->name_assign_type = NET_NAME_RENAMED;
> >>
> >
> >________________________________
> >
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________________________________

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