netdev - Re: [PATCH 3/3] netlink: support setting devgroup parameters

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Message-ID: <20110111121350.GB26417@cormyr>
Date:	Tue, 11 Jan 2011 14:13:50 +0200
From:	Vlad Dogaru <ddvlad@...edu.org>
To:	jamal <hadi@...erus.ca>
Cc:	netdev@...r.kernel.org, Octavian Purdila <opurdila@...acom.com>
Subject: Re: [PATCH 3/3] netlink: support setting devgroup parameters

On Mon, Jan 10, 2011 at 08:14:33AM -0500, jamal wrote:
> 
> Nice - short and sweet.
> 
> IMO: I dont think you need this new attribute, IFLA_GROUP
> should suffice...
> You can use the trick that if a <=0 ifindex is specified,
> and no name is passed but a GROUP is passed, then we
> operate on the group i.e something like:
> 
>         if (ifm->ifi_index > 0)
>                 dev = __dev_get_by_index(net, ifm->ifi_index);
>         else {
>                 if (tb[IFLA_IFNAME])
>                      dev = __dev_get_by_name(net, ifname);
>                 else if (tb[IFLA_GROUP])
>                      new/get/set/del specific stuff..
>                 else
>                    return -EINVAL;
>        }

That sounds like a good idea, but, by using the same attribute,
userspace won't be able to change the group of all the interfaces in a
group, i.e. no more
	ip l set group 1 devgroup 0

However, I'm not sure that the use case above would be very common.

Vlad
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