netdev - RE: [net-next 05/10] if_link: Add additional parameter to IFLA_VF

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Date:	Mon, 26 Sep 2011 09:32:35 -0700
From:	"Rose, Gregory V" <gregory.v.rose@...el.com>
To:	Stephen Hemminger <shemminger@...tta.com>,
	Ben Hutchings <bhutchings@...arflare.com>
CC:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>
Subject: RE: [net-next 05/10] if_link: Add additional parameter to
 IFLA_VF_INFO for spoof checking

> -----Original Message-----
> From: Stephen Hemminger [mailto:shemminger@...tta.com]
> Sent: Monday, September 26, 2011 9:14 AM
> To: Ben Hutchings
> Cc: Kirsher, Jeffrey T; davem@...emloft.net; Rose, Gregory V;
> netdev@...r.kernel.org; gospo@...hat.com
> Subject: Re: [net-next 05/10] if_link: Add additional parameter to
> IFLA_VF_INFO for spoof checking
> 
> On Sun, 25 Sep 2011 21:06:49 +0100
> Ben Hutchings <bhutchings@...arflare.com> wrote:
> 
> > On Sun, 2011-09-25 at 10:22 -0700, Stephen Hemminger wrote:
> > > On Sat, 24 Sep 2011 02:17:38 -0700
> > > Jeff Kirsher <jeffrey.t.kirsher@...el.com> wrote:
> > >
> > > > From: Greg Rose <gregory.v.rose@...el.com>
> > > >
> > > > Add configuration setting for drivers to turn spoof checking on or
> off
> > > > for discrete VFs.
> > > >
> > > > Signed-off-by: Greg Rose <gregory.v.rose@...el.com>
> > > > Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> > > > ---
> > > >  include/linux/if_link.h   |    7 +++++++
> > > >  include/linux/netdevice.h |    3 +++
> > > >  net/core/rtnetlink.c      |   25 ++++++++++++++++++++++---
> > > >  3 files changed, 32 insertions(+), 3 deletions(-)
> > > >
> > > > diff --git a/include/linux/if_link.h b/include/linux/if_link.h
> > > > index 0ee969a..8bd6d6d 100644
> > > > --- a/include/linux/if_link.h
> > > > +++ b/include/linux/if_link.h
> > > > @@ -279,6 +279,7 @@ enum {
> > > >  	IFLA_VF_MAC,		/* Hardware queue specific attributes
> */
> > > >  	IFLA_VF_VLAN,
> > > >  	IFLA_VF_TX_RATE,	/* TX Bandwidth Allocation */
> > > > +	IFLA_VF_SPOOFCHK,	/* Spoof Checking on/off switch */
> > > >  	__IFLA_VF_MAX,
> > > >  };
> > > >
> > > > @@ -300,12 +301,18 @@ struct ifla_vf_tx_rate {
> > > >  	__u32 rate; /* Max TX bandwidth in Mbps, 0 disables throttling
> */
> > > >  };
> > > >
> > > > +struct ifla_vf_spoofchk {
> > > > +	__u32 vf;
> > > > +	__u32 setting;
> > > > +};
> > > > +
> > > >  struct ifla_vf_info {
> > > >  	__u32 vf;
> > > >  	__u8 mac[32];
> > > >  	__u32 vlan;
> > > >  	__u32 qos;
> > > >  	__u32 tx_rate;
> > > > +	__u32 spoofchk;
> > > >  };
> > >
> > > This breaks ABI compatibility, unless you add some special case code
> > > to handle the case of tools sending the old ifla_vf_info. Users may
> have older version
> > > of ip utilities that send smaller size structure.
> >
> > Unless I'm missing something, that structure is not sent or received by
> > userland; that's why I thought it should be #ifdef __KERNEL__.
> 
> The struct ifla_vf_info is exposed to userland, it is not inside the
> #ifdef
> and therefore exposed.
> 
> But it is probably okay to change this structure because the ifla_vf_info
> is not used/supported by any released version iproute2.  There may have
> been
> some patches to use this, but they never made it into the git or released
> code.
> 

I will respin the patches with *ifdef __KERNEL__ wrapper.

Thanks,

- Greg

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