netdev - Re: [PATCH net-next v10 1/4] net netlink: Add new type NLA_FLAG

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Date:   Mon, 12 Jun 2017 09:51:19 -0400
From:   Jamal Hadi Salim <jhs@...atatu.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        xiyou.wangcong@...il.com, eric.dumazet@...il.com,
        simon.horman@...ronome.com, mrv@...atatu.com
Subject: Re: [PATCH net-next v10 1/4] net netlink: Add new type NLA_FLAG_BITS

On 17-06-12 07:43 AM, Jiri Pirko wrote:
> Mon, Jun 12, 2017 at 01:10:56PM CEST, jhs@...atatu.com wrote:
>> On 17-06-12 06:34 AM, Jiri Pirko wrote:
>>> Sun, Jun 11, 2017 at 08:37:25PM CEST, jhs@...atatu.com wrote:
>>>> On 17-06-11 01:38 PM, Jamal Hadi Salim wrote:
>>>>> On 17-06-11 09:49 AM, Jiri Pirko wrote:
>>>>>> Sun, Jun 11, 2017 at 01:53:43PM CEST, jhs@...atatu.com wrote:
>>>>>>> From: Jamal Hadi Salim <jhs@...atatu.com>
>>>>>
>>>>>
>>>>>>> This patch also provides an extra feature: a validation callback
>>>>>>> that could be speaciliazed for other types.
>>>>>>
>>>>>> s/speaciliazed/speciliazed/
>>>>>>
>>>>>
>>>>> Will fix.
>>>>>
>>>>>
>>>>>>>
>>>>>>> [ATTR_GOO] = { .type = MYTYPE,
>>>>>>>              .validation_data = &myvalidation_data,
>>>>>>>                  .validate_content = mycontent_validator },
>>>>>>
>>>>>> Indent is wrong. (Does not matter really in desc, but anyway)
>>>>>>
>>>>>
>>>>> I cant find out how it got indented that way; my source
>>>>> or email dont show it as such (but really doesnt matter).
>>>>>
>>>>>
>>>>>> Suggested-by: Jiri Pirko <jiri@...lanox.com>
>>>>>>
>>>>>
>>>>> Will add.
>>>>>
>>>>>>

>>> I believe that this struct should go into:
>>> include/uapi/linux/netlink.h
>>>
>>> struct nla_flag_bits {
>>> 	__u32 nla_flag_bits_values;
>>> 	__u32 nla_flag_bits_selector;
>>> };
>>>
>>> Then you can use it from userspace and everywhere in kernel.
>>>
>> That file seems to be very out of place for this stuff.
> 
> Howcome? It is a common netlink api.
> 

Take a look at that file's content. It talks about what goes in
the netlink header. Adding types in it seems out of place.


>> NLA_XXX are kernel side types.  They are part of net/netlink.h which is
>> not uapi accessible.
>> David Ahern has submitted a patch to move all those defines to iproute2.
>> Will make sense to move these to a uapi/linux/netlink-types.h but that
>> is waay beyond the scope of this patch set.
> 
> Well, I don't think so :)
> 
> The thing is, struct nla_flag_bits is tightly coupled with NLA_FLAG_BITS
> enum value. They should be in the same uapi file. That makes sense to me.
> 

Sure - they should be in the same file. But is it uapi/linux/netlink.h?

cheers,
jamal