netdev - Re: [PATCH net-next 1/2] mlxsw: spectrum_router: Return an error for non-default FIB rules

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Date:   Tue, 1 May 2018 18:19:27 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     David Ahern <dsahern@...il.com>
Cc:     Ido Schimmel <idosch@...lanox.com>, netdev@...r.kernel.org,
        davem@...emloft.net, jiri@...lanox.com, mlxsw@...lanox.com
Subject: Re: [PATCH net-next 1/2] mlxsw: spectrum_router: Return an error for
 non-default FIB rules

On Tue, May 01, 2018 at 09:16:23AM -0600, David Ahern wrote:
> On 5/1/18 2:16 AM, Ido Schimmel wrote:
> > Since commit 9776d32537d2 ("net: Move call_fib_rule_notifiers up in
> > fib_nl_newrule") it is possible to forbid the installation of
> > unsupported FIB rules.
> > 
> > Have mlxsw return an error for non-default FIB rules in addition to the
> > existing extack message.
> > 
> > Example:
> > # ip rule add from 198.51.100.1 table 10
> > Error: mlxsw_spectrum: FIB rules not supported.
> > 
> > Note that offload is only aborted when non-default FIB rules are already
> > installed and merely replayed during module initialization.
> > 
> > Signed-off-by: Ido Schimmel <idosch@...lanox.com>
> > ---
> >  drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
> > index 8e4edb634b11..baea97560029 100644
> > --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
> > +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
> > @@ -5899,7 +5899,7 @@ static int mlxsw_sp_router_fib_rule_event(unsigned long event,
> >  	}
> >  
> >  	if (err < 0)
> > -		NL_SET_ERR_MSG_MOD(extack, "FIB rules not supported. Aborting offload");
> > +		NL_SET_ERR_MSG_MOD(extack, "FIB rules not supported");
> >  
> >  	return err;
> 
> shouldn't mlxsw_sp_router_fib_rule_event return -EOPNOTSUPP instead of
> -1 (EPERM)?

The -1 wasn't visible until now so it didn't matter. Will change to
-EOPNOTSUPP in v2. Thanks