netdev - Re: [net-next 04/17] ixgbevf: provide 64 bit statistics

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Date:	Mon, 20 Jun 2011 05:29:50 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"davem@...emloft.net" <davem@...emloft.net>,
	Stephen Hemminger <shemminger@...tta.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"gospo@...hat.com" <gospo@...hat.com>
Subject: Re: [net-next 04/17] ixgbevf: provide 64 bit statistics

On Sun, 2011-06-19 at 21:59 -0700, Eric Dumazet wrote:
> Le dimanche 19 juin 2011 à 17:58 -0700, Jeff Kirsher a écrit :
> > From: Stephen Hemminger <shemminger@...tta.com>
> > 
> > Compute statistics per ring using 64 bits, and provide
> > network device stats in 64 bits.
> > 
> > Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
> > Acked-by: Greg Rose <Gregory.v.rose@...el.com>
> > Tested-by: Evan Swanson <evan.swanson@...el.com>
> > Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> > ---
> 
> >  
> > +static struct rtnl_link_stats64 *ixgbevf_get_stats(struct net_device *netdev,
> > +						   struct rtnl_link_stats64 *stats)
> > +{
> > +	struct ixgbevf_adapter *adapter = netdev_priv(netdev);
> > +	int i;
> > +
> > +	ixgbevf_update_stats(adapter);
> > +
> > +	stats->multicast = adapter->stats.vfmprc - adapter->stats.base_vfmprc;
> > +
> > +	for (i = 0; i < adapter->num_rx_queues; i++) {
> > +		stats->rx_bytes += adapter->rx_ring[i].total_bytes;
> > +		stats->rx_packets += adapter->rx_ring[i].total_packets;
> > +	}
> > +
> > +	for (i = 0; i < adapter->num_tx_queues; i++) {
> > +		stats->tx_bytes += adapter->tx_ring[i].total_bytes;
> > +		stats->tx_packets += adapter->tx_ring[i].total_packets;
> > +	}
> > +
> > +	return stats;
> > +}
> > +
> 
> Unfortunately this patch is racy on 32bit arches.
> 
> Jeff, maybe you missed all the discussion we had lately on these
> conversions, needing appropriate synchronization ?

I apologize I did not see the discussion regarding Stephen's patches.

> 
> It seems a lot of bugs were added lately with Stephen patches, this is
> rather unfortunate...
> 
> I guess I'll have to review them and send fixes.

I will drop Stephen's patch from this series and look forward to your
fixes.  Thanks Eric.



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