netdev - Re: [PATCH net-next v6 5/6] flow_offload: support get multi-subsystem block

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Date:   Tue, 6 Aug 2019 18:10:00 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     wenxu@...oud.cn
Cc:     jakub.kicinski@...ronome.com, jiri@...nulli.us,
        netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v6 5/6] flow_offload: support get
 multi-subsystem block

On Sun, Aug 04, 2019 at 09:24:00PM +0800, wenxu@...oud.cn wrote:
> diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
> index 8f1a7b8..6022dd0 100644
> --- a/include/net/flow_offload.h
> +++ b/include/net/flow_offload.h
[...]
> @@ -282,6 +282,8 @@ int flow_block_cb_setup_simple(struct flow_block_offload *f,
>  }
>  EXPORT_SYMBOL(flow_block_cb_setup_simple);
>  
> +static LIST_HEAD(block_ing_cb_list);
> +
>  static struct rhashtable indr_setup_block_ht;
>  
>  struct flow_indr_block_cb {
> @@ -295,7 +297,6 @@ struct flow_indr_block_dev {
>  	struct rhash_head ht_node;
>  	struct net_device *dev;
>  	unsigned int refcnt;
> -	flow_indr_block_ing_cmd_t  *block_ing_cmd_cb;
>  	struct list_head cb_list;
>  };
>  
> @@ -389,6 +390,22 @@ static void flow_indr_block_cb_del(struct flow_indr_block_cb *indr_block_cb)
>  	kfree(indr_block_cb);
>  }
>  
> +static void flow_block_ing_cmd(struct net_device *dev,
> +			       flow_indr_block_bind_cb_t *cb,
> +			       void *cb_priv,
> +			       enum flow_block_command command)
> +{
> +	struct flow_indr_block_ing_entry *entry;
> +
> +	rcu_read_lock();
> +

unnecessary empty line.

> +	list_for_each_entry_rcu(entry, &block_ing_cb_list, list) {
> +		entry->cb(dev, cb, cb_priv, command);
> +	}
> +
> +	rcu_read_unlock();

OK, there's rcu_read_lock here...

> +}
> +
>  int __flow_indr_block_cb_register(struct net_device *dev, void *cb_priv,
>  				  flow_indr_block_bind_cb_t *cb,
>  				  void *cb_ident)
> @@ -406,10 +423,8 @@ int __flow_indr_block_cb_register(struct net_device *dev, void *cb_priv,
>  	if (err)
>  		goto err_dev_put;
>  
> -	if (indr_dev->block_ing_cmd_cb)
> -		indr_dev->block_ing_cmd_cb(dev, indr_block_cb->cb,
> -					   indr_block_cb->cb_priv,
> -					   FLOW_BLOCK_BIND);
> +	flow_block_ing_cmd(dev, indr_block_cb->cb, indr_block_cb->cb_priv,
> +			   FLOW_BLOCK_BIND);
>  
>  	return 0;
>  
> @@ -448,10 +463,8 @@ void __flow_indr_block_cb_unregister(struct net_device *dev,
>  	if (!indr_block_cb)
>  		return;
>  
> -	if (indr_dev->block_ing_cmd_cb)
> -		indr_dev->block_ing_cmd_cb(dev, indr_block_cb->cb,
> -					   indr_block_cb->cb_priv,
> -					   FLOW_BLOCK_UNBIND);
> +	flow_block_ing_cmd(dev, indr_block_cb->cb, indr_block_cb->cb_priv,
> +			   FLOW_BLOCK_UNBIND);
>  
>  	flow_indr_block_cb_del(indr_block_cb);
>  	flow_indr_block_dev_put(indr_dev);
> @@ -469,7 +482,6 @@ void flow_indr_block_cb_unregister(struct net_device *dev,
>  EXPORT_SYMBOL_GPL(flow_indr_block_cb_unregister);
>  
>  void flow_indr_block_call(struct net_device *dev,
> -			  flow_indr_block_ing_cmd_t cb,
>  			  struct flow_block_offload *bo,
>  			  enum flow_block_command command)
>  {
> @@ -480,15 +492,24 @@ void flow_indr_block_call(struct net_device *dev,
>  	if (!indr_dev)
>  		return;
>  
> -	indr_dev->block_ing_cmd_cb = command == FLOW_BLOCK_BIND
> -				     ? cb : NULL;
> -
>  	list_for_each_entry(indr_block_cb, &indr_dev->cb_list, list)
>  		indr_block_cb->cb(dev, indr_block_cb->cb_priv, TC_SETUP_BLOCK,
>  				  bo);
>  }
>  EXPORT_SYMBOL_GPL(flow_indr_block_call);
>  
> +void flow_indr_add_block_ing_cb(struct flow_indr_block_ing_entry *entry)
> +{

... but registration does not protect the list with a mutex.

> +	list_add_tail_rcu(&entry->list, &block_ing_cb_list);
> +}
> +EXPORT_SYMBOL_GPL(flow_indr_add_block_ing_cb);