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Subject: Re: [PATCH] net/rds/Kconfig: RDS should depend on IPV6
To:     Ka-Cheong Poon <ka-cheong.poon@oracle.com>,
        Anders Roxell <anders.roxell@linaro.org>
Cc:     davem@davemloft.net, netdev@vger.kernel.org,
        linux-rdma@vger.kernel.org, rds-devel@oss.oracle.com,
        linux-kernel@vger.kernel.org
References: <20180725222008.32186-1-anders.roxell@linaro.org>
 <cefa5c0b-7935-a6b5-1796-1d5a3da5dd87@oracle.com>
 <3e4b4c29-40f8-211b-62e3-c9411b2c0013@oracle.com>
From:   "santosh.shilimkar@oracle.com" <santosh.shilimkar@oracle.com>
Organization: Oracle Corporation
Message-ID: <62dc735a-19ca-13ca-bd7e-3b591ffc132e@oracle.com>
Date:   Wed, 25 Jul 2018 22:02:16 -0700
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On 7/25/18 9:56 PM, Ka-Cheong Poon wrote:
> On 07/26/2018 06:36 AM, Santosh Shilimkar wrote:
>> On 7/25/2018 3:20 PM, Anders Roxell wrote:
>>> Build error, implicit declaration of function __inet6_ehashfn shows up
>>> When RDS is enabled but not IPV6.
>>> net/rds/connection.c: In function ‘rds_conn_bucket’:
>>> net/rds/connection.c:67:9: error: implicit declaration of function 
>>> ‘__inet6_ehashfn’; did you mean ‘__inet_ehashfn’? 
>>> [-Werror=implicit-function-declaration]
>>>    hash = __inet6_ehashfn(lhash, 0, fhash, 0, rds_hash_secret);
>>>           ^~~~~~~~~~~~~~~
>>>           __inet_ehashfn
>>>
>>> Current code adds IPV6 as a depends on in config RDS.
>>>
>>> Fixes: eee2fa6ab322 ("rds: Changing IP address internal 
>>> representation to struct in6_addr")
>>> Signed-off-by: Anders Roxell <anders.roxell@linaro.org>
>>> --- >>>   net/rds/Kconfig | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/net/rds/Kconfig b/net/rds/Kconfig
>>> index 41f75563b54b..607128f10bcd 100644
>>> --- a/net/rds/Kconfig
>>> +++ b/net/rds/Kconfig
>>> @@ -1,7 +1,7 @@
>>>   config RDS
>>>       tristate "The RDS Protocol"
>>> -    depends on INET
>>> +    depends on INET && CONFIG_IPV6
>> This should build without CONFIG_IPV6 too.
>>
>> Hi Ka-cheong,
>> Can you please loot at it ? I know you modified
>> lookup function to take always in6_addr now, but
>> probably hashing with '__inet_ehashfn' should
>> work too for non IPV6 address(s).
> 
> 
> I guess for now, let's add this dependency first.  I
> will do a follow up patch to remove this dependency.
> 
Sounds good to me.

FWIW,
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>