Re: [PATCH net] macvtap: fix tx_dropped counting error

[Vlad Yasevich <vyasevic@redhat.com>]

On 11/25/2013 04:19 AM, Jason Wang wrote:
> After commit 8ffab51b3dfc54876f145f15b351c41f3f703195
> (macvlan: lockless tx path), tx stat counter were converted to percpu stat
> structure. So we need use to this also for tx_dropped in macvtap. Otherwise, the
> management won't notice the dropping packet in macvtap tx path.
> 
> Cc: Michael S. Tsirkin <mst@redhat.com>
> Cc: Vlad Yasevich <vyasevic@redhat.com>

Acked-by: Vlad Yasevich <vyasevic@redhat.com>

-vlad
> Cc: Eric Dumazet <edumazet@google.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
>  drivers/net/macvtap.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
> index dc76670..0605da8 100644
> --- a/drivers/net/macvtap.c
> +++ b/drivers/net/macvtap.c
> @@ -744,7 +744,7 @@ err:
>  	rcu_read_lock();
>  	vlan = rcu_dereference(q->vlan);
>  	if (vlan)
> -		vlan->dev->stats.tx_dropped++;
> +		this_cpu_inc(vlan->pcpu_stats->tx_dropped);
>  	rcu_read_unlock();
>  
>  	return err;
>