netdev - Re: [PATCH 1/25 v2] rdma/cm: define native IB address

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Message-ID: <4FC7940F.5010309@dev.mellanox.co.il>
Date:	Thu, 31 May 2012 11:53:51 -0400
From:	Hal Rosenstock <hal@....mellanox.co.il>
To:	"Hefty, Sean" <sean.hefty@...el.com>
CC:	Roland Dreier <roland@...estorage.com>,
	David Miller <davem@...emloft.net>,
	"linux-rdma (linux-rdma@...r.kernel.org)" 
	<linux-rdma@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/25 v2] rdma/cm: define native IB address

On 3/7/2012 12:45 PM, Hefty, Sean wrote:
>> On Mon, Feb 27, 2012 at 2:22 PM, Hefty, Sean <sean.hefty@...el.com> wrote:
>>>>> --- a/include/linux/socket.h
>>>>> +++ b/include/linux/socket.h
>>>>> @@ -184,6 +184,7 @@ struct ucred {
>>>>>  #define AF_PPPOX       24      /* PPPoX sockets                */
>>>>>  #define AF_WANPIPE     25      /* Wanpipe API Sockets */
>>>>>  #define AF_LLC         26      /* Linux LLC                    */
>>>>> +#define AF_IB          27      /* Native InfiniBand address    */
>>>>>  #define AF_CAN         29      /* Controller Area Network      */
>>>>>  #define AF_TIPC                30      /* TIPC
>> sockets                 */
>>>>>  #define AF_BLUETOOTH   31      /* Bluetooth sockets            */
>>>>> @@ -227,6 +228,7 @@ struct ucred {
>>>>>  #define PF_PPPOX       AF_PPPOX
>>>>>  #define PF_WANPIPE     AF_WANPIPE
>>>>>  #define PF_LLC         AF_LLC
>>>>> +#define PF_IB          AF_IB
>>>>>  #define PF_CAN         AF_CAN
>>>>>  #define PF_TIPC                AF_TIPC
>>>>>  #define PF_BLUETOOTH   AF_BLUETOOTH
>>>>
>>>> Has this been run by the networking community?  Are they OK with this
>>>> assignment?
>>>
>>> I did copy netdev on the original submissions, but I don't remember any
>> explicit ack or nack.
>>
>> David, any feeling yay or nay about adding these?
>>
>> Is the kernel the final arbiter of AF_xxx / PF_xxx assignments, or
>> is there anything else we have to worry about?
> 
> To clarify the intent of this change:
> 
> The RDMA CM allows users to specify addresses using struct sockaddr.  Today, only INET/6 are supported.  
> The intent is to allow a user to specify native InfiniBand addresses through that interface.  
> In the more immediate, this helps to solve InfiniBand scaling issues.

Yes, this is key for InfiniBand scaling.

> Longer term, this can also be used to control path failover.

This AF_IB patch series appears to be stalled unless I missed something
on the list. What needs to be done to revive it/move it along ?

Thanks.

-- Hal

> 
> - Sean
> --
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