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

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Date: Thu, 30 May 2024 18:14:58 +0800
From: "D. Wythe" <alibuda@...ux.alibaba.com>
To: kgraul@...ux.ibm.com, wenjia@...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 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