netdev - Re: [PATCH -next] sundance: Add initial ethtool stats support

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Message-ID: <1286951637.2703.141.camel@edumazet-laptop>
Date:	Wed, 13 Oct 2010 08:33:57 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Denis Kirjanov <dkirjanov@...nel.org>
Cc:	netdev@...r.kernel.org, David Miller <davem@...emloft.net>,
	Joe Perches <joe@...ches.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Jeff Garzik <jgarzik@...hat.com>
Subject: Re: [PATCH -next] sundance: Add initial ethtool stats support

Le mercredi 13 octobre 2010 à 10:06 +0400, Denis Kirjanov a écrit :

> @@ -1494,13 +1506,23 @@ static struct net_device_stats *get_stats(struct net_device *dev)
>  	dev->stats.rx_missed_errors	+= ioread8(ioaddr + RxMissed);
>  	dev->stats.tx_packets += ioread16(ioaddr + TxFramesOK);
>  	dev->stats.rx_packets += ioread16(ioaddr + RxFramesOK);
> -	dev->stats.collisions += ioread8(ioaddr + StatsLateColl);
> -	dev->stats.collisions += ioread8(ioaddr + StatsMultiColl);
> -	dev->stats.collisions += ioread8(ioaddr + StatsOneColl);
>  	dev->stats.tx_carrier_errors += ioread8(ioaddr + StatsCarrierError);
> -	ioread8(ioaddr + StatsTxDefer);
> -	for (i = StatsTxDefer; i <= StatsMcastRx; i++)
> -		ioread8(ioaddr + i);
> +
> +	np->xstats.tx_multiple_collisions += ioread8(ioaddr + StatsMultiColl);
> +	np->xstats.tx_single_collisions += ioread8(ioaddr + StatsOneColl);
> +	np->xstats.tx_late_collisions += ioread8(ioaddr + StatsLateColl);
> +	dev->stats.collisions += np->xstats.tx_multiple_collisions
> +		+ np->xstats.tx_single_collisions
> +		+ np->xstats.tx_late_collisions;


Oh well..., really ?

Each time we are calling get_stats(), you do

dev->stats.collisions += (number of accumulated collisions since device
is up)

instead of

dev->stats.collisions += (number of accumulated collisions since last
time we read counters)


Can you see the problem ?



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