netdev - Re: [PATCH] bridge: make brctl showstp display port id

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Date:	Tue, 1 May 2012 10:39:55 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] bridge: make brctl showstp display port id

On Tue, 1 May 2012 16:38:34 +0200
Joakim Tjernlund <joakim.tjernlund@...nsmode.se> wrote:

> Stephen Hemminger <shemminger@...tta.com> wrote on 2012/04/30 18:07:47:
> >
> > On Mon, 30 Apr 2012 10:39:08 +0200
> > Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se> wrote:
> >
> > > My brctl showstp br0 always shows a 0 port id:
> > > eth2 (1)
> > >  port id      0         state             disabled
> > >  designated root   8000.00069c00b2fb   path cost       100
> > >
> > > because port id is printed as a hex number in sys fs. Change the
> > > two hex occurrences(port no and port id) to decimal, just like all
> > > the other numbers in this area.
> > >
> > > Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>
> > > ---
> > >  net/bridge/br_sysfs_if.c |    4 ++--
> > >  1 files changed, 2 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
> > > index fd5799c..9c4c2eb 100644
> > > --- a/net/bridge/br_sysfs_if.c
> > > +++ b/net/bridge/br_sysfs_if.c
> > > @@ -86,13 +86,13 @@ static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
> > >
> > >  static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
> > >  {
> > > -   return sprintf(buf, "0x%x\n", p->port_id);
> > > +   return sprintf(buf, "%d\n", p->port_id);
> > >  }
> > >  static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
> > >
> > >  static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
> > >  {
> > > -   return sprintf(buf, "0x%x\n", p->port_no);
> > > +   return sprintf(buf, "%d\n", p->port_no);
> > >  }
> > >
> > >  static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
> >
> > No. This would be a visible change to applications.
> > The bridge utilities should be fixed instead.
> 
> Well, my reasoning was that if not the native tools got this right, what are the
> chances that other apps got it right? I don't know any other apps than
> brctl using this info, do you? We could check one or two apps to see what they do.
> 
>  Jocke
> 

Current bridge-utils does not have the issue. It has been fixed
for 5 years. The problem was fixed by:

commit 0397c6aa48769505e6aa4481f0786c8f4eaaf890
Author: Jeremy Jackson <jerj@...lanar.net>
Date:   Tue May 8 11:10:34 2007 -0700

    I've noticed for a while that
    
    output is showing 0 for port_no and  port_id
    
    It seems that somewhere in 2.6 sysfs land the following items got
    printed in hexadecimal, and brctl code was parsing for decimal only
    
    doug:/sys/class/net/eth0/brport# cat port_id
    0x8001
    doug:/sys/class/net/eth0/brport# cat port_no
    0x1

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