netdev - Re: [PATCH net 0/4] net: add rx

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Date:	Thu, 28 Jan 2016 01:18:09 -0500
From:	Jarod Wilson <jarod@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jiri Pirko <jiri@...lanox.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	Tom Herbert <tom@...bertland.com>,
	Jay Vosburgh <j.vosburgh@...il.com>,
	Veaceslav Falico <vfalico@...il.com>,
	Andy Gospodarek <gospo@...ulusnetworks.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH net 0/4] net: add rx_unhandled stat counter

On Thu, Jan 28, 2016 at 01:02:15AM -0500, Jarod Wilson wrote:
> On Wed, Jan 27, 2016 at 01:09:47PM -0800, Eric Dumazet wrote:
> > On Wed, 2016-01-27 at 15:21 -0500, Jarod Wilson wrote:
> > 
> > > diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> > > index 289c231..7973ab5 100644
> > > --- a/include/linux/netdevice.h
> > > +++ b/include/linux/netdevice.h
> > > @@ -180,6 +180,7 @@ struct net_device_stats {
> > >  	unsigned long	tx_window_errors;
> > >  	unsigned long	rx_compressed;
> > >  	unsigned long	tx_compressed;
> > > +	unsigned long	rx_unhandled;
> > >  };
> > >  
> > 
> > This structure is deprecated, please do not add new fields in it,
> > as it will increase netlink answers for no good reason.
> > 
> > rtnl_link_stats64 is what really matters these days.
> 
> I'll respin the set without that

Or not. Now I remember why I added that in the first place:

In file included from ./arch/x86/include/asm/uaccess.h:7:0,
                 from net/core/dev.c:75:
net/core/dev.c: In function 'netdev_stats_to_stats64':
include/linux/compiler.h:484:20: error: call to '__compiletime_assert_7263' declared with attribute error: BUILD_BUG_ON failed: sizeof(*stats64) != sizeof(*netdev_stats)
    prefix ## suffix();    \
                    ^

Things are actually hard-wired to require that addition at the moment, or
you get the above build failure. Not sure if it's safe to remove that
BUILD_BUG_ON() yet, haven't looked closely, it's past my bed time. :)

-- 
Jarod Wilson
jarod@...hat.com