netdev - Re: [PATCH net-next] net/smc: Introduce TCP ULP support

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Message-ID: <d08fabaa-88e8-0980-7ca2-896c7f535b88@linux.ibm.com>
Date:   Mon, 3 Jan 2022 10:09:08 +0100
From:   Karsten Graul <kgraul@...ux.ibm.com>
To:     Tony Lu <tonylu@...ux.alibaba.com>
Cc:     kuba@...nel.org, davem@...emloft.net, netdev@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH net-next] net/smc: Introduce TCP ULP support

On 31/12/2021 10:13, Tony Lu wrote:
> On Thu, Dec 30, 2021 at 04:03:19PM +0100, Karsten Graul wrote:
>> On 28/12/2021 14:44, Tony Lu wrote:
>>> This implements TCP ULP for SMC, helps applications to replace TCP with
>>> SMC protocol in place. And we use it to implement transparent
>>> replacement.
>>>
>>> This replaces original TCP sockets with SMC, reuse TCP as clcsock when
>>> calling setsockopt with TCP_ULP option, and without any overhead.
>>
>> This looks very interesting. Can you provide a simple userspace example about 
>> how to use ULP with smc?
> 
> Here is a userspace C/S application:

Thanks for the example, it was very helpful!