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

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Date:	Tue, 1 May 2012 09:53:48 -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.

Unfortunately, that isn't really possible. API's get very hard to change
safely. It isn't worth the effort.

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