netdev - Re: [PATCH net-next v2 1/4] ipv6: introduce new type ipv6_addr_props to hold ipv6 address type and scope

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Date:	Sun, 17 Feb 2013 11:52:26 +0900
From:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
To:	netdev@...r.kernel.org, brian.haley@...com,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Subject: Re: [PATCH net-next v2 1/4] ipv6: introduce new type ipv6_addr_props
 to hold ipv6 address type and scope

Hannes Frederic Sowa wrote:
> On Sun, Feb 17, 2013 at 08:31:52AM +0900, YOSHIFUJI Hideaki wrote:
>>>> -extern int __ipv6_addr_type(const struct in6_addr *addr);
>>>> -static inline int ipv6_addr_type(const struct in6_addr *addr)
>>>> +struct ipv6_addr_props {
>>>> +	u16 type;
>>>> +	s16 scope;
>>>> +};
>>>> +
>>>> +extern struct ipv6_addr_props __ipv6_addr_props(const struct in6_addr *addr);
>>>> +static inline unsigned int ipv6_addr_type(const struct in6_addr *addr)
>>>>  {
>>>> -	return __ipv6_addr_type(addr) & 0xffff;
>>>> +	return __ipv6_addr_props(addr).type;
>>>>  }
>>>>  
>>>>  static inline int ipv6_addr_scope(const struct in6_addr *addr)
>>>>  {
>>>> -	return __ipv6_addr_type(addr) & IPV6_ADDR_SCOPE_MASK;
>>>> +	return __ipv6_addr_props(addr).scope;
>>>>  }
>>>>  
>>>
>>> NAK.  This does not return correct value as before.
>>> If you are going to covert this, please do not try to
>>> change usage of inlines.  
>>
>> I meant
>>
>> struct ipv6_addrtype {
>> 	__u16 type;
>> 	__s16 scope;
>> };
>>
>> struct ipv6_addrtype __ipv6_addr_type(const struct in6_addr *addr);
>> int ipv6_addr_type(const struct in6_addr *addr)
>> {
>> 	return __ipv6_addr_type(addr).type;
>> }
>>
>> And most users should not be touched except for it type name
>> (int => struct addrtype).
> 
> Sorry, I am a bit confused. The missing '& IPV6_ADDR_SCOPE_MASK' is clearly a
> bug. I implied a bitmask for the IPV6_ADDR_SCOPE_* macros. But I don't
> understand to what you do refer in your second mail.
> 

No, return __ipv6_addr_type(addr).type & IPV6_ADDR_SCOPE_MASK, see?

You have changed too many things in a single patch.
Please do not try to change function arguments, and so on
e.g. if original takes int by __ipv6_addr_type() value, please leave
it semantics as is.

I think you can concentrate on your original work for multicast/scoping
issues first.

Thanks.

--yoshfuji
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