netdev - Re: [net-next PATCH] ip_tunnel: Report Rx dropped in ip_tunnel_get

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Date:	Thu, 14 May 2015 14:21:07 -0700
From:	Alexander Duyck <alexander.duyck@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	Alexander Duyck <alexander.h.duyck@...hat.com>
CC:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [net-next PATCH] ip_tunnel: Report Rx dropped in ip_tunnel_get_stats64

On 05/14/2015 02:01 PM, Eric Dumazet wrote:
> On Thu, 2015-05-14 at 13:56 -0700, Eric Dumazet wrote:
>
>> Or use netdev_stats_to_stats64() to remove all these copies, as we
>> obviously can miss some of them.
> Something like following untested patch :
>
> diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
> index 3998b1822d8521ad391ac26db1e694a3cd7ad011..3f298193d19ffc3a9e57fac4654c59bbe65545e1 100644
> --- a/net/ipv4/ip_tunnel_core.c
> +++ b/net/ipv4/ip_tunnel_core.c
> @@ -165,6 +165,7 @@ struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
>   {
>   	int i;
>   
> +	netdev_stats_to_stats64(tot, &dev->stats);
>   	for_each_possible_cpu(i) {
>   		const struct pcpu_sw_netstats *tstats =
>   						   per_cpu_ptr(dev->tstats, i);
> @@ -184,23 +185,6 @@ struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
>   		tot->rx_bytes   += rx_bytes;
>   		tot->tx_bytes   += tx_bytes;
>   	}
> -
> -	tot->multicast = dev->stats.multicast;
> -
> -	tot->rx_crc_errors = dev->stats.rx_crc_errors;
> -	tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
> -	tot->rx_length_errors = dev->stats.rx_length_errors;
> -	tot->rx_frame_errors = dev->stats.rx_frame_errors;
> -	tot->rx_errors = dev->stats.rx_errors;
> -
> -	tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
> -	tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
> -	tot->tx_dropped = dev->stats.tx_dropped;
> -	tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
> -	tot->tx_errors = dev->stats.tx_errors;
> -
> -	tot->collisions  = dev->stats.collisions;
> -
>   	return tot;
>   }
>   EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
>

Yeah, I just submitted v2 and realized I needed to have the call before 
looping through the percpu stats.  I will have v3 ready shortly based on 
your suggestion.

- Alex
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