linux-kernel - Re: [PATCH] ipmi: rate limit ipmi smi

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Message-ID: <20210729133706.GY3406@minyard.net>
Date:   Thu, 29 Jul 2021 08:37:06 -0500
From:   Corey Minyard <minyard@....org>
To:     Wen Yang <wenyang@...ux.alibaba.com>
Cc:     Baoyou Xie <baoyou.xie@...baba-inc.com>,
        openipmi-developer@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipmi: rate limit ipmi smi_event failure message

On Thu, Jul 29, 2021 at 05:32:28PM +0800, Wen Yang wrote:
> Sometimes we can't get a valid si_sm_data, and we print an error
> message accordingly. But the ipmi module seem to like retrying a lot,
> in which case we flood the kernel log with a lot of messages, eg:

This is reasonable.  I moved the #define into the dev_warn_ratelimited
because that looked a little strange, and having the #define really
didn't add any value.  But that's it, queued for next release.

Thanks,

-corey

> 
> [46318019.164726] ipmi_si IPI0001:00: Could not set the global enables: 0xc1.
> [46318020.109700] ipmi_si IPI0001:00: Could not set the global enables: 0xc1.
> [46318021.158677] ipmi_si IPI0001:00: Could not set the global enables: 0xc1.
> [46318022.212598] ipmi_si IPI0001:00: Could not set the global enables: 0xc1.
> [46318023.258564] ipmi_si IPI0001:00: Could not set the global enables: 0xc1.
> [46318024.210455] ipmi_si IPI0001:00: Could not set the global enables: 0xc1.
> [46318025.260473] ipmi_si IPI0001:00: Could not set the global enables: 0xc1.
> [46318026.308445] ipmi_si IPI0001:00: Could not set the global enables: 0xc1.
> [46318027.356389] ipmi_si IPI0001:00: Could not set the global enables: 0xc1.
> [46318028.298288] ipmi_si IPI0001:00: Could not set the global enables: 0xc1.
> [46318029.363302] ipmi_si IPI0001:00: Could not set the global enables: 0xc1.
> 
> Signed-off-by: Wen Yang <wenyang@...ux.alibaba.com>
> Cc: Baoyou Xie <baoyou.xie@...baba-inc.com>
> Cc: Corey Minyard <minyard@....org>
> Cc: openipmi-developer@...ts.sourceforge.net
> Cc: linux-kernel@...r.kernel.org
> ---
>  drivers/char/ipmi/ipmi_si_intf.c | 15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
> index 62929a3..f64c3ac 100644
> --- a/drivers/char/ipmi/ipmi_si_intf.c
> +++ b/drivers/char/ipmi/ipmi_si_intf.c
> @@ -591,7 +591,7 @@ static void handle_transaction_done(struct smi_info *smi_info)
>  		smi_info->handlers->get_result(smi_info->si_sm, msg, 3);
>  		if (msg[2] != 0) {
>  			/* Error clearing flags */
> -			dev_warn(smi_info->io.dev,
> +			dev_warn_ratelimited(smi_info->io.dev,
>  				 "Error clearing flags: %2.2x\n", msg[2]);
>  		}
>  		smi_info->si_state = SI_NORMAL;
> @@ -683,10 +683,11 @@ static void handle_transaction_done(struct smi_info *smi_info)
>  		/* We got the flags from the SMI, now handle them. */
>  		smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
>  		if (msg[2] != 0) {
> -			dev_warn(smi_info->io.dev,
> -				 "Couldn't get irq info: %x.\n", msg[2]);
> -			dev_warn(smi_info->io.dev,
> -				 "Maybe ok, but ipmi might run very slowly.\n");
> +#define IPMI_WARN_CHECKING_ENABLES "Maybe ok, but ipmi might run very slowly."
> +
> +			dev_warn_ratelimited(smi_info->io.dev,
> +				"Couldn't get irq info: %x, %s\n",
> +				msg[2], IPMI_WARN_CHECKING_ENABLES);
>  			smi_info->si_state = SI_NORMAL;
>  			break;
>  		}
> @@ -721,7 +722,7 @@ static void handle_transaction_done(struct smi_info *smi_info)
>  
>  		smi_info->handlers->get_result(smi_info->si_sm, msg, 4);
>  		if (msg[2] != 0)
> -			dev_warn(smi_info->io.dev,
> +			dev_warn_ratelimited(smi_info->io.dev,
>  				 "Could not set the global enables: 0x%x.\n",
>  				 msg[2]);
>  
> @@ -1343,7 +1344,7 @@ static int try_get_dev_id(struct smi_info *smi_info)
>  
>  		if (cc != IPMI_CC_NO_ERROR &&
>  		    ++retry_count <= GET_DEVICE_ID_MAX_RETRY) {
> -			dev_warn(smi_info->io.dev,
> +			dev_warn_ratelimited(smi_info->io.dev,
>  			    "BMC returned 0x%2.2x, retry get bmc device id\n",
>  			    cc);
>  			goto retry;
> -- 
> 1.8.3.1
>