netdev - Re: [PATCH net-next v3 1/3] flow_offload: move tc indirect block to flow offload

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Date:   Fri, 26 Jul 2019 17:56:27 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     wenxu@...oud.cn
Cc:     pablo@...filter.org, fw@...len.de, netfilter-devel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next v3 1/3] flow_offload: move tc indirect block to
 flow offload

On Fri, 26 Jul 2019 21:34:05 +0800, wenxu@...oud.cn wrote:
> From: wenxu <wenxu@...oud.cn>
> 
> move tc indirect block to flow_offload and rename
> it to flow indirect block.The nf_tables can use the
> indr block architecture.
> 
> Signed-off-by: wenxu <wenxu@...oud.cn>

> diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
> index 00b9aab..66f89bc 100644
> --- a/include/net/flow_offload.h
> +++ b/include/net/flow_offload.h
> @@ -4,6 +4,7 @@
>  #include <linux/kernel.h>
>  #include <linux/list.h>
>  #include <net/flow_dissector.h>
> +#include <linux/rhashtable.h>
>  
>  struct flow_match {
>  	struct flow_dissector	*dissector;
> @@ -366,4 +367,42 @@ static inline void flow_block_init(struct flow_block *flow_block)
>  	INIT_LIST_HEAD(&flow_block->cb_list);
>  }
>  
> +typedef int flow_indr_block_bind_cb_t(struct net_device *dev, void *cb_priv,
> +				      enum tc_setup_type type, void *type_data);
> +
> +struct flow_indr_block_cb {
> +	struct list_head list;
> +	void *cb_priv;
> +	flow_indr_block_bind_cb_t *cb;
> +	void *cb_ident;
> +};
> +
> +typedef void flow_indr_block_ing_cmd_t(struct net_device *dev,
> +				       struct flow_block *flow_block,
> +				       struct flow_indr_block_cb *indr_block_cb,
> +				       enum flow_block_command command);
> +
> +struct flow_indr_block_dev {
> +	struct rhash_head ht_node;
> +	struct net_device *dev;
> +	unsigned int refcnt;
> +	struct list_head cb_list;
> +	flow_indr_block_ing_cmd_t *ing_cmd_cb;
> +	struct flow_block *flow_block;

TC can only have one block per device. Now with nftables offload we can
have multiple blocks. Could you elaborate how this is solved?

> +};