netdev - RE: [net-next 02/12] ixgbe: Fix return value from macvlan filter function

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Date:	Mon, 29 Oct 2012 16:27:45 +0000
From:	"Rose, Gregory V" <gregory.v.rose@...el.com>
To:	Konstantin Stepanyuk <konstantin.stepanyuk@...il.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
CC:	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>,
	"sassmann@...hat.com" <sassmann@...hat.com>
Subject: RE: [net-next 02/12] ixgbe: Fix return value from macvlan filter
 function

> -----Original Message-----
> From: Konstantin Stepanyuk [mailto:konstantin.stepanyuk@...il.com]
> Sent: Saturday, October 27, 2012 11:37 AM
> To: Kirsher, Jeffrey T
> Cc: davem@...emloft.net; Rose, Gregory V; netdev@...r.kernel.org;
> gospo@...hat.com; sassmann@...hat.com
> Subject: Re: [net-next 02/12] ixgbe: Fix return value from macvlan filter
> function
> 
> On Fri, Oct 26, 2012 at 6:08 PM, Jeff Kirsher
> <jeffrey.t.kirsher@...el.com> wrote:
> > From: Greg Rose <gregory.v.rose@...el.com>
> >
> > The function to set the macvlan filter should return success or
> > failure instead of the index of the filter.  The message processing
> > function was misinterpreting the index as a non-zero return code
> > indicating failure and NACKing MAC filter set messages that actually
> succeeded.
> >
> > Signed-off-by: Greg Rose <gregory.v.rose@...el.com>
> > Tested-by: Robert Garrett <robertx.e.garrett@...el.com>
> > Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> > ---
> >  drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> > b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> > index 96876b7..b68bf0f 100644
> > --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> > +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> > @@ -742,7 +742,8 @@ static int ixgbe_set_vf_macvlan_msg(struct
> ixgbe_adapter *adapter,
> >                 e_warn(drv,
> >                        "VF %d has requested a MACVLAN filter but there
> is no space for it\n",
> >                        vf);
> > -       return err;
> > +
> > +       return !!err < 0;
> This expression always resolves to false, either 0 < 0 or 1 < 0, because
> '!' has higher precedence than '<'.

It's a typo.  I'll fix it.

- Greg

> 
> Thanks,
> Konstantin