netdev - Re: [PATCH] myri10ge: 64bit slice stats

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Date:	Mon, 20 Jun 2011 20:49:18 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jon Mason <jon.mason@...i.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Andrew Gallatin <gallatin@...i.com>
Subject: Re: [PATCH] myri10ge: 64bit slice stats

Le lundi 20 juin 2011 à 13:46 -0500, Jon Mason a écrit :
> There is a potential issue of internal 32bit stats wrapping before
> updating the external 64bit stats, thus leading to incorrect stats.
> Since there is no hardware necessity for these counters to be 32bit,
> change them to be 64bit to avoid this issue.
> 
> Patch suggested by Eric Dumazet.
> 
> Signed-off-by: Jon Mason <mason@...i.com>
> ---
>  drivers/net/myri10ge/myri10ge.c |   12 ++++++------
>  1 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
> index 04e10f4..2a51de1 100644
> --- a/drivers/net/myri10ge/myri10ge.c
> +++ b/drivers/net/myri10ge/myri10ge.c
> @@ -170,12 +170,12 @@ struct myri10ge_rx_done {
>  };
>  
>  struct myri10ge_slice_netstats {
> -	unsigned long rx_packets;
> -	unsigned long tx_packets;
> -	unsigned long rx_bytes;
> -	unsigned long tx_bytes;
> -	unsigned long rx_dropped;
> -	unsigned long tx_dropped;
> +	u64 rx_packets;
> +	u64 tx_packets;
> +	u64 rx_bytes;
> +	u64 tx_bytes;
> +	u64 rx_dropped;
> +	u64 tx_dropped;
>  };
>  
>  struct myri10ge_slice_state {

Hmm, no sorry, this wont work on 32bit arches :(

Please take a look at various patches addressing this problem.



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