linux-kernel - Re: [RFC PATCH net-next v4 0/9] net/smc: Introduce SMC-D-based OS internal communication acceleration

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Date:   Mon, 10 Apr 2023 22:31:27 +0800
From:   Wen Gu <guwen@...ux.alibaba.com>
To:     Wenjia Zhang <wenjia@...ux.ibm.com>, kgraul@...ux.ibm.com,
        jaka@...ux.ibm.com, wintera@...ux.ibm.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc:     linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH net-next v4 0/9] net/smc: Introduce SMC-D-based OS
 internal communication acceleration

On 2023/4/5 22:48, Wenjia Zhang wrote:

> 
> Hi Wen,
> 
> Thank you for the new version. The discussion on the open issue is still on-going in our organisation internally. I 
> appreciate your patience!
> 
> One thing I need to mention during testing the loopback device on our platform is that we get crash, because 
> smc_ism-signal_shutdown() is called by smc_1gr_free_work(), which is called indirectly by smc_conn_free(). Please make 
> sure that it would go to the path of the loopback device cleanly. Any question and consideration is welcome!
> 
> Thanks,
> Wenjia

Thank you! Wenjia. Testing on s390 is really helpful.

Since most of the path in smc_ism_signal_shutdown() is inside the preprocessing
macro '#if IS_ENABLED(CONFIG_ISM) ... #endif', so they are not executed in my
test environment, therefore I didn't realized the interface of ops->signal_event
in loopback device and missed the crash.

I will fix this and check for the other parts wrapped by '#if IS_ENABLED(CONFIG_ISM)
... #endif' which I ignored before. Then I will send out a new version.

Thanks,
Wen Gu