netdev - RE: Question: how to detect if a qdisc is root or not?

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Message-ID: <D5C1322C3E673F459512FB59E0DDC3290340F87C@orsmsx414.amr.corp.intel.com>
Date:	Wed, 18 Jul 2007 16:29:19 -0700
From:	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>
To:	"Patrick McHardy" <kaber@...sh.net>
Cc:	<netdev@...r.kernel.org>
Subject: RE: Question: how to detect if a qdisc is root or not?

> You're right, thats a bug. TC_H_ROOT is the parent ID, which 
> is stored in sch->parent. IIRC its also passed to the 
> ->init() function.

Unfortunately it's not passed.  It is passed into the ->change()
function:

static int prio_init(struct Qdisc *sch, struct rtattr *opt)

static int prio_change(struct Qdisc *sch, u32 handle, u32 parent, struct
rtattr **tca, unsigned long *arg)

I did mess around with sch->parent a bit, with no success (it appears to
be zero / unitialized).  I'll keep investigating.

Thanks,

-PJ Waskiewicz
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