netdev - Re: Deadlock, L2TP over IP are not working, 3.4.1

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Date:	Sun, 10 Jun 2012 15:38:17 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hong zhi guo <honkiko@...il.com>
Cc:	davem@...emloft.net, Denys Fedoryshchenko <denys@...p.net.lb>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Francois Romieu <romieu@...zoreil.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Deadlock, L2TP over IP are not working, 3.4.1

On Sun, 2012-06-10 at 15:31 +0200, Eric Dumazet wrote:

>  include/linux/netdevice.h |   40 ++++++++++++++++++++++++++++--------
>  net/l2tp/l2tp_eth.c       |   29 +++++++++++++-------------
>  2 files changed, 47 insertions(+), 22 deletions(-)
> 
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index d94cb14..1dee75a 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -171,14 +171,38 @@ static inline bool dev_xmit_complete(int rc)
>   */
>  
>  struct net_device_stats {
> -	unsigned long	rx_packets;
> -	unsigned long	tx_packets;
> -	unsigned long	rx_bytes;
> -	unsigned long	tx_bytes;
> -	unsigned long	rx_errors;
> -	unsigned long	tx_errors;
> -	unsigned long	rx_dropped;
> -	unsigned long	tx_dropped;
> +	union {
> +		unsigned long	rx_packets;
> +		atomic_long_t   rx_packets_atomic;
> +	};
> +	union {
> +		unsigned long	tx_packets;
> +		atomic_long_t	tx_packets_atomic;
> +	};
> +	union {
> +		unsigned long	rx_bytes;
> +		atomic_long_t	rx_bytes_atomic;
> +	};
> +	union {
> +		unsigned long	tx_bytes;
> +		atomic_long_t	tx_bytes_atomic;
> +	};
> +	union {
> +		unsigned long	rx_errors;
> +		atomic_long_t	rx_errors_atomic;
> +	};
> +	union {
> +		unsigned long	tx_errors;
> +		atomic_long_t	tx_errors_atomic;
> +	};
> +	union {
> +		unsigned long	rx_dropped;
> +		atomic_long_t	rx_dropped_atomic;
> +	};
> +	union {
> +		unsigned long	tx_dropped;
> +		atomic_long_t	tx_dropped_atomic;
> +	};

Other choice would be to have a new structure

struct net_device_atomic_stats {
	atomic_long_t rx_packets;
	atomic_long_t tx_packets;
	atomic_long_t rx_bytes;
	atomic_long_t tx_bytes;
	atomic_long_t rx_errors;
	atomic_long_t tx_errors;
	atomic_long_t rx_dropped;
	atomic_long_t tx_dropped;
...
};

and to union it in :

struct net_device {
	...
	union {
		struct net_device_stats	       stats;
		struct net_device_atomic_stats atom_stats;
	};
	...
};


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