linux-kernel - Re: [PATCH net] net/smc: return the right falback reason when prefix checks fail

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Message-ID: <5b54a227-2e18-46d5-9b15-aea9709cf2a5@linux.ibm.com>
Date:   Thu, 12 Oct 2023 15:05:20 +0200
From:   Alexandra Winter <wintera@...ux.ibm.com>
To:     Dust Li <dust.li@...ux.alibaba.com>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        Wenjia Zhang <wenjia@...ux.ibm.com>,
        Jan Karcher <jaka@...ux.ibm.com>,
        "D. Wythe" <alibuda@...ux.alibaba.com>,
        Tony Lu <tonylu@...ux.alibaba.com>,
        Wen Gu <guwen@...ux.alibaba.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     linux-s390@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] net/smc: return the right falback reason when prefix
 checks fail



On 12.10.23 14:37, Dust Li wrote:
> In the smc_listen_work(), if smc_listen_prfx_check() failed,
> the real reason: SMC_CLC_DECL_DIFFPREFIX was dropped, and
> SMC_CLC_DECL_NOSMCDEV was returned.
> 
> Althrough this is also kind of SMC_CLC_DECL_NOSMCDEV, but return
> the real reason is much friendly for debugging.
> 
> Fixes: e49300a6bf62 ("net/smc: add listen processing for SMC-Rv2")
> Signed-off-by: Dust Li <dust.li@...ux.alibaba.com>

As you point out the current code is not really wrong. So I am not sure,
whether this should be a fix for net, or rather a debug improvement for
net-next.

> ---
>  net/smc/af_smc.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
> index bacdd971615e..21d4476b937b 100644
> --- a/net/smc/af_smc.c
> +++ b/net/smc/af_smc.c
> @@ -2361,7 +2361,7 @@ static int smc_listen_find_device(struct smc_sock *new_smc,
>  		smc_find_ism_store_rc(rc, ini);
>  		return (!rc) ? 0 : ini->rc;
>  	}
> -	return SMC_CLC_DECL_NOSMCDEV;
> +	return prfx_rc;
>  }
>  
>  /* listen worker: finish RDMA setup */

For the code change:
Reviewed-by: Alexandra Winter <wintera@...ux.ibm.com>