linux-kernel - Re: [RFC PATCH v7 03/19] Export 2 func for device to assign/deassign new strucure

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Date:	Sat, 05 Jun 2010 16:51:36 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	xiaohui.xin@...el.com
Cc:	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, mst@...hat.com, mingo@...e.hu,
	davem@...emloft.net, herbert@...dor.apana.org.au,
	jdike@...ux.intel.com
Subject: Re: [RFC PATCH v7 03/19] Export 2 func for device to
 assign/deassign new strucure

Le samedi 05 juin 2010 à 18:14 +0800, xiaohui.xin@...el.com a écrit :
> From: Xin Xiaohui <xiaohui.xin@...el.com>
> 
> Signed-off-by: Xin Xiaohui <xiaohui.xin@...el.com>
> Signed-off-by: Zhao Yu <yzhao81new@...il.com>
> Reviewed-by: Jeff Dike <jdike@...ux.intel.com>
> ---
>  include/linux/netdevice.h |    3 +++
>  net/core/dev.c            |   28 ++++++++++++++++++++++++++++
>  2 files changed, 31 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index bae725c..efb575a 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -1592,6 +1592,9 @@ extern gro_result_t	napi_frags_finish(struct napi_struct *napi,
>  					  gro_result_t ret);
>  extern struct sk_buff *	napi_frags_skb(struct napi_struct *napi);
>  extern gro_result_t	napi_gro_frags(struct napi_struct *napi);
> +extern int netdev_mp_port_attach(struct net_device *dev,
> +				 struct mpassthru_port *port);
> +extern void netdev_mp_port_detach(struct net_device *dev);
>  
>  static inline void napi_free_frags(struct napi_struct *napi)
>  {
> diff --git a/net/core/dev.c b/net/core/dev.c
> index f769098..ecbb6b1 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -2469,6 +2469,34 @@ void netif_nit_deliver(struct sk_buff *skb)
>  	rcu_read_unlock();
>  }
>  
> +/* Export two functions to assign/de-assign mp_port pointer
> + * to a net device.
> + */
> +
> +int netdev_mp_port_attach(struct net_device *dev,
> +			struct mpassthru_port *port)
> +{
> +	/* locked by mp_mutex */
> +	if (rcu_dereference(dev->mp_port))
> +		return -EBUSY;
> +

Please... this is bogus...

Try with following config settings :

CONFIG_PROVE_LOCKING=y
CONFIG_PROVE_RCU=y
CONFIG_PROVE_RCU_REPEATEDLY=y




> +	rcu_assign_pointer(dev->mp_port, port);
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(netdev_mp_port_attach);
> +
> +void netdev_mp_port_detach(struct net_device *dev)
> +{
> +	/* locked by mp_mutex */
> +	if (!rcu_dereference(dev->mp_port))
> +		return;

same problem here

> +
> +	rcu_assign_pointer(dev->mp_port, NULL);
> +	synchronize_rcu();
> +}
> +EXPORT_SYMBOL(netdev_mp_port_detach);
> +
>  /**
>   *	netif_receive_skb - process receive buffer from network
>   *	@skb: buffer to process


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