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

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Date:	Mon, 26 Sep 2011 09:14:26 -0700
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>, davem@...emloft.net,
	Greg Rose <gregory.v.rose@...el.com>, 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.


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