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

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Date:   Sat, 27 Jul 2019 16:05:35 +0800
From:   wenxu <wenxu@...oud.cn>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
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


在 2019/7/27 8:56, Jakub Kicinski 写道:
> 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?
>
>> +};

the nftable offload only work on netdev base chain. Each device can limit to one netdev base chain.