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 08:31:52 +0900
From:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
To:	hannes@...essinduktion.org
CC:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>,
	netdev@...r.kernel.org, brian.haley@...com
Subject: Re: [PATCH net-next v2 1/4] ipv6: introduce new type ipv6_addr_props
 to hold ipv6 address type and scope

YOSHIFUJI Hideaki wrote:
> Hannes Frederic Sowa wrote:
>> This simplifies ipv6 address type handling. The old implementation had
>> the problem that scope and type where both squeezed into one int. Because
>> of this it was dangerous to do comparisons on it or check for scope while
>> it is actually being stripped out. This patch mainly improves type safety.
>>
>> v2:
>> a) Incorportated feedback from Brian Haley
>> b) fix style in addrconf_core.c:__ipv6_addr_props
>>
>> Cc: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
>> Cc: Brian Haley <brian.haley@...com>
>> Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
>> ---
>>  include/net/ipv6.h       | 20 ++++++----
>>  net/ipv6/addrconf.c      | 28 +++++++-------
>>  net/ipv6/addrconf_core.c | 99 +++++++++++++++++++++++++++++++-----------------
>>  net/ipv6/datagram.c      | 12 +++---
>>  4 files changed, 99 insertions(+), 60 deletions(-)
>>
>> diff --git a/include/net/ipv6.h b/include/net/ipv6.h
>> index 851d541..a14700c 100644
>> --- a/include/net/ipv6.h
>> +++ b/include/net/ipv6.h
>> @@ -298,25 +298,31 @@ static inline int ip6_frag_mem(struct net *net)
>>  #define IPV6_FRAG_LOW_THRESH	(3 * 1024*1024)	/* 3145728 */
>>  #define IPV6_FRAG_TIMEOUT	(60 * HZ)	/* 60 seconds */
>>  
>> -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).

--yohsfuji
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