netdev - Re: [PATCH net v2] net/smc: Reset conn->lgr when link group registration fails

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Message-ID: <8242aa42-4356-0333-4e59-3d6a6f20d737@linux.alibaba.com>
Date:   Wed, 5 Jan 2022 14:18:33 +0800
From:   Wen Gu <guwen@...ux.alibaba.com>
To:     Karsten Graul <kgraul@...ux.ibm.com>, davem@...emloft.net,
        kuba@...nel.org
Cc:     linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, dust.li@...ux.alibaba.com,
        tonylu@...ux.alibaba.com
Subject: Re: [PATCH net v2] net/smc: Reset conn->lgr when link group
 registration fails

Thanks for your reply.

On 2022/1/4 5:58 pm, Karsten Graul wrote:
> On 04/01/2022 03:59, Wen Gu wrote:
>> SMC connections might fail to be registered to a link group due to
>> things like unable to find a link to assign to in its creation. As
>> a result, connection creation will return a failure and most
>> resources related to the connection won't be applied or initialized,
>> such as conn->abort_work or conn->lnk.
> 
> Patch looks good to me, but one more thing to think about:
> 
> Would it be better to invoke __smc_lgr_terminate() instead of smc_lgr_schedule_free_work()
> when a link group was created but cannot be used now? This would immediately free up all
> allocated resources for this unusable link group instead of starting the default 10-minute
> timer until the link group is freed.
> __smc_lgr_terminate() takes care of completely removing the link group in the context of
> its caller. It is also used from within smc_lgr_cleanup_early() that is used when the very
> first connection of a link group is aborted.

Thanks for your suggestion.

I also agree with using link group termination function for a immediate free.

I will improve it and send a v3 patch.

Thanks,
Wen Gu