netdev - Re: [net-next PATCH v1 01/11] net: flow_table: create interface for hw match/action tables

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Date:	Mon, 05 Jan 2015 16:45:50 -0800
From:	John Fastabend <john.fastabend@...il.com>
To:	Thomas Graf <tgraf@...g.ch>
CC:	sfeldma@...il.com, jiri@...nulli.us, jhs@...atatu.com,
	simon.horman@...ronome.com, netdev@...r.kernel.org,
	davem@...emloft.net, andy@...yhouse.net
Subject: Re: [net-next PATCH v1 01/11] net: flow_table: create interface for
 hw match/action tables

[...]

>>> +/**
>>> + * @struct net_flow_field_ref
>>> + * @brief uniquely identify field as header:field tuple
>>> + */
>>> +struct net_flow_field_ref {
>>> +    int instance;
>>> +    int header;
>>> +    int field;
>>> +    int mask_type;
>>> +    int type;
>>> +    union {    /* Are these all the required data types */
>>> +        __u8 value_u8;
>>> +        __u16 value_u16;
>>> +        __u32 value_u32;
>>> +        __u64 value_u64;
>>> +    };
>>> +    union {    /* Are these all the required data types */
>>> +        __u8 mask_u8;
>>> +        __u16 mask_u16;
>>> +        __u32 mask_u32;
>>> +        __u64 mask_u64;
>>> +    };
>>> +};
>>
>> Does it make sense to write this as follows?
>
> Yes. I'll make this update it helps make it clear value/mask pairs are
> needed.
>
>>
>> union {
>>          struct {
>>                  __u8 value_u8;
>>                  __u8 mask_u8;
>>          };
>>          struct {
>>                  __u16 value_u16;
>>                  __u16 mask_u16;
>>          };
>>          ...
>> };

Another thought is to pull this entirely out of the structure and hide
it from the UAPI so we can add more value/mask types as needed without
having to spin versions of net_flow_field_ref. On the other hand I've
been able to fit all my fields in these types so far and I can't think
of any additions we need at the moment.

>>
>>> +#define NET_FLOW_TABLE_EGRESS_ROOT 1
>>> +#define    NET_FLOW_TABLE_INGRESS_ROOT 2
>>
>> Tab/space mix.
>>
>

[...]


-- 
John Fastabend         Intel Corporation
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