netdev - Re: [PATCH net-next v5 0/3] Introduce IPPROTO

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Date: Fri, 31 May 2024 10:06:43 +0200
From: Wenjia Zhang <wenjia@...ux.ibm.com>
To: "D. Wythe" <alibuda@...ux.alibaba.com>, kgraul@...ux.ibm.com,
        jaka@...ux.ibm.com, wintera@...ux.ibm.com, guwen@...ux.alibaba.com
Cc: kuba@...nel.org, davem@...emloft.net, netdev@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org,
        tonylu@...ux.alibaba.com, pabeni@...hat.com, edumazet@...gle.com
Subject: Re: [PATCH net-next v5 0/3] Introduce IPPROTO_SMC



On 30.05.24 12:14, D. Wythe wrote:
> 
> 
> On 5/30/24 5:30 PM, D. Wythe wrote:
>> From: "D. Wythe" <alibuda@...ux.alibaba.com>
>>
>> This patch allows to create smc socket via AF_INET,
>> similar to the following code,
>>
>> /* create v4 smc sock */
>> v4 = socket(AF_INET, SOCK_STREAM, IPPROTO_SMC);
>>
>> /* create v6 smc sock */
>> v6 = socket(AF_INET6, SOCK_STREAM, IPPROTO_SMC);
> 
> Welcome everyone to try out the eBPF based version of smc_run during 
> testing, I have added a separate command called smc_run.bpf,
> it was equivalent to normal smc_run but with IPPROTO_SMC via eBPF.
> 
> You can obtain the code and more info from: 
> https://github.com/D-Wythe/smc-tools
> 
> Usage:
> 
> smc_run.bpf
> An eBPF implemented smc_run based on IPPROTO_SMC:
> 
> 1. Support to transparent replacement based on command (Just like smc_run).
> 2. Supprot to transparent replacement based on pid configuration. And 
> supports the inheritance of this capability between parent and child 
> processes.
> 3. Support to transparent replacement based on per netns configuration.
> 
> smc_run.bpf COMMAND
> 
> 1. Equivalent to smc_run but with IPPROTO_SMC via eBPF
> 
> smc_run.bpf -p pid
> 
>   1. Add the process with target pid to the map. Afterward, all socket() 
> calls of the process and its descendant processes will be replaced from 
> IPPROTO_TCP to IPPROTO_SMC.
>   2. Mapping will be automatically deleted when process exits.
>   3. Specifically, COMMAND mode is actually works like following:
> 
>      smc_run.bpf -p $$
>      COMMAND
>      exit
> 
> smc_run.bpf -n 1
> 
>   1. Make all socket() calls of the current netns to be replaced from 
> IPPROTO_TCP to IPPROTO_SMC.
>   2. Turn off it by smc_run.bpf -n 0
> 
> 
Hi D. Wythe,

Thank you for the info and description! The code generally looks good to 
me, just still some details I need to check again. And I'd like to give 
smc_run.bpf a try, and maybe let you know if it works for me next week.

Thanks,
Wenjia