linux-kernel - Re: [PATCH net 1/2] net/smc: bugfix for smcr v2 server connect success statistic

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Message-ID: <be086da3-061d-8f39-6e79-0e5d21771453@linux.ibm.com>
Date:   Fri, 8 Sep 2023 11:42:36 +0200
From:   Wenjia Zhang <wenjia@...ux.ibm.com>
To:     Guangguan Wang <guangguan.wang@...ux.alibaba.com>,
        jaka@...ux.ibm.com, kgraul@...ux.ibm.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc:     tonylu@...ux.alibaba.com, alibuda@...ux.alibaba.com,
        guwen@...ux.alibaba.com, linux-s390@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net 1/2] net/smc: bugfix for smcr v2 server connect
 success statistic



On 08.09.23 05:31, Guangguan Wang wrote:
> In the macro SMC_STAT_SERV_SUCC_INC, the smcd_version is used
> to determin whether to increase the v1 statistic or the v2
> statistic. It is correct for SMCD. But for SMCR, smcr_version
> should be used.
> 
> Signed-off-by: Guangguan Wang <guangguan.wang@...ux.alibaba.com>
> ---
>   net/smc/smc_stats.h | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/smc/smc_stats.h b/net/smc/smc_stats.h
> index b60fe1eb37ab..aa8928975cc6 100644
> --- a/net/smc/smc_stats.h
> +++ b/net/smc/smc_stats.h
> @@ -243,8 +243,9 @@ while (0)
>   #define SMC_STAT_SERV_SUCC_INC(net, _ini) \
>   do { \
>   	typeof(_ini) i = (_ini); \
> -	bool is_v2 = (i->smcd_version & SMC_V2); \
>   	bool is_smcd = (i->is_smcd); \
> +	u8 version = is_smcd ? i->smcd_version : i->smcr_version; \
> +	bool is_v2 = (version & SMC_V2); \
>   	typeof(net->smc.smc_stats) smc_stats = (net)->smc.smc_stats; \
>   	if (is_v2 && is_smcd) \
>   		this_cpu_inc(smc_stats->smc[SMC_TYPE_D].srv_v2_succ_cnt); \

ohje, that is because the statistic was implemented first, then SMCR_v2. 
Good catch! Thank you!