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Date:   Wed, 17 Jun 2020 21:29:44 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     wenxu@...oud.cn
Cc:     netdev@...r.kernel.org, davem@...emloft.net, vladbu@...lanox.com,
        simon.horman@...ronome.com
Subject: Re: [PATCH net v4 1/4] flow_offload: add
 flow_indr_block_cb_alloc/remove function

On Thu, Jun 18, 2020 at 12:55:04AM +0800, wenxu@...oud.cn wrote:
> From: wenxu <wenxu@...oud.cn>
> 
> Add flow_indr_block_cb_alloc/remove function prepare for the bug fix
> in the third patch.
> 
> Signed-off-by: wenxu <wenxu@...oud.cn>
> ---
>  include/net/flow_offload.h | 13 +++++++++++++
>  net/core/flow_offload.c    | 43 ++++++++++++++++++++++++++++++++-----------
>  2 files changed, 45 insertions(+), 11 deletions(-)
> 
> diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
> index f2c8311..bf43430 100644
> --- a/include/net/flow_offload.h
> +++ b/include/net/flow_offload.h
> @@ -467,6 +467,12 @@ struct flow_block_cb {
>  struct flow_block_cb *flow_block_cb_alloc(flow_setup_cb_t *cb,
>  					  void *cb_ident, void *cb_priv,
>  					  void (*release)(void *cb_priv));
> +struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb,
> +					       void *cb_ident, void *cb_priv,
> +					       void (*release)(void *cb_priv),
> +					       struct flow_block_offload *bo,
> +					       struct net_device *dev, void *data,
> +					       void (*cleanup)(struct flow_block_cb *block_cb));
>  void flow_block_cb_free(struct flow_block_cb *block_cb);
>  
>  struct flow_block_cb *flow_block_cb_lookup(struct flow_block *block,
> @@ -488,6 +494,13 @@ static inline void flow_block_cb_remove(struct flow_block_cb *block_cb,
>  	list_move(&block_cb->list, &offload->cb_list);
>  }
>  
> +static inline void flow_indr_block_cb_remove(struct flow_block_cb *block_cb,
> +					     struct flow_block_offload *offload)
> +{
> +	list_del(&block_cb->indr.list);
> +	list_move(&block_cb->list, &offload->cb_list);
> +}
> +
>  bool flow_block_cb_is_busy(flow_setup_cb_t *cb, void *cb_ident,
>  			   struct list_head *driver_block_list);
>  
> diff --git a/net/core/flow_offload.c b/net/core/flow_offload.c
> index 0cfc35e..9fe4b58 100644
> --- a/net/core/flow_offload.c
> +++ b/net/core/flow_offload.c
> @@ -329,6 +329,38 @@ struct flow_indr_dev {
>  	struct rcu_head			rcu;
>  };
>  
> +static void flow_block_indr_init(struct flow_block_cb *flow_block,
> +				 struct flow_block_offload *bo,
> +				 struct net_device *dev, void *data,
> +				 void (*cleanup)(struct flow_block_cb *block_cb))
> +{
> +	flow_block->indr.binder_type = bo->binder_type;
> +	flow_block->indr.data = data;
> +	flow_block->indr.dev = dev;
> +	flow_block->indr.cleanup = cleanup;
> +}
> +
> +struct flow_block_cb *flow_indr_block_cb_alloc(flow_setup_cb_t *cb,
> +					       void *cb_ident, void *cb_priv,
> +					       void (*release)(void *cb_priv),
> +					       struct flow_block_offload *bo,
> +					       struct net_device *dev, void *data,
> +					       void (*cleanup)(struct flow_block_cb *block_cb))
> +{
> +	struct flow_block_cb *block_cb;
> +
> +	block_cb = flow_block_cb_alloc(cb, cb_ident, cb_priv, release);
> +	if (IS_ERR(block_cb))
> +		goto out;
> +
> +	flow_block_indr_init(block_cb, bo, dev, data, cleanup);
> +	list_add(&block_cb->indr.list, &flow_block_indr_list);
> +
> +out:
> +	return block_cb;
> +}
> +EXPORT_SYMBOL(flow_indr_block_cb_alloc);

You can probably place flow_indr_block_cb_alloc() right before
flow_indr_dev_setup_offload(), so you don't have to move
flow_block_indr_init() ?

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