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

From: Greg Rose <gregory.v.rose@intel.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@intel.com>
Tested-by: Robert Garrett <robertx.e.garrett@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

On Fri, Oct 26, 2012 at 6:08 PM, Jeff Kirsher
<jeffrey.t.kirsher@intel.com> wrote:
> From: Greg Rose <gregory.v.rose@intel.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@intel.com>
> Tested-by: Robert Garrett <robertx.e.garrett@intel.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.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 '<'.

Thanks,
Konstantin
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> -----Original Message-----

> From: Konstantin Stepanyuk [mailto:konstantin.stepanyuk@gmail.com]

> Sent: Saturday, October 27, 2012 11:37 AM

> To: Kirsher, Jeffrey T

> Cc: davem@davemloft.net; Rose, Gregory V; netdev@vger.kernel.org;

> gospo@redhat.com; sassmann@redhat.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@intel.com> wrote:

> > From: Greg Rose <gregory.v.rose@intel.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@intel.com>

> > Tested-by: Robert Garrett <robertx.e.garrett@intel.com>

> > Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.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