From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <shemminger@vyatta.com>
Subject: Re: [patch net-next-2.6] bridge: allow hub-like behaviour
Date: Thu, 12 Aug 2010 08:55:20 -0400
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To: Jiri Pirko <jpirko@redhat.com>
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On Thu, 12 Aug 2010 14:48:48 +0200
Jiri Pirko <jpirko@redhat.com> wrote:

> Thu, Aug 12, 2010 at 02:35:41PM CEST, shemminger@vyatta.com wrote:
> >On Thu, 12 Aug 2010 13:15:24 +0200
> >Jiri Pirko <jpirko@redhat.com> wrote:
> >
> >> Wed, Aug 11, 2010 at 06:07:41PM CEST, shemminger@vyatta.com wrote:
> >> >NO. unnecessary
> >> >
> >> >Already possible, without patch. Just set the hold time
> >> >on the bridge to 0!
> >> 
> >> Sorry, but could you please point me a sysfs node where should I do this
> >> setting? Unable to find this.
> >> 
> >> Thanks.
> >> 
> >
> >/sys/class/net/ethX/brport/hold_timer
> 
> That's read-only:
> 
> static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
> 

Guess you have to use ioctl() interface to change it for now.
Looks like a missed opportunity when sysfs support was added.
There are some other values like forward_delay that have same problem.