netdev - Re: [PATCH v5 net-next 2/8] sfc: add devlink info support for ef100

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Message-ID: <DM6PR12MB4202DC0B50437D82E28EAAC2C1DB9@DM6PR12MB4202.namprd12.prod.outlook.com>
Date:   Tue, 7 Feb 2023 14:42:45 +0000
From:   "Lucero Palau, Alejandro" <alejandro.lucero-palau@....com>
To:     Jiri Pirko <jiri@...nulli.us>,
        "Lucero Palau, Alejandro" <alejandro.lucero-palau@....com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-net-drivers (AMD-Xilinx)" <linux-net-drivers@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "habetsm.xilinx@...il.com" <habetsm.xilinx@...il.com>,
        "ecree.xilinx@...il.com" <ecree.xilinx@...il.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "corbet@....net" <corbet@....net>,
        "jiri@...dia.com" <jiri@...dia.com>
Subject: Re: [PATCH v5 net-next 2/8] sfc: add devlink info support for ef100


On 2/2/23 11:58, Jiri Pirko wrote:
> Thu, Feb 02, 2023 at 12:14:17PM CET, alejandro.lucero-palau@....com wrote:
>> From: Alejandro Lucero <alejandro.lucero-palau@....com>
>>
>> Support for devlink info command.
> You are quite brief for couple hundred line patch. Care to shed some
> more details for the reader? Also, use imperative mood (applies to the
> rest of the pathes)
>
> [...]
>

OK. I'll be more talkative and imperative here.

>> +static int efx_devlink_info_get(struct devlink *devlink,
>> +				struct devlink_info_req *req,
>> +				struct netlink_ext_ack *extack)
>> +{
>> +	struct efx_devlink *devlink_private = devlink_priv(devlink);
>> +	struct efx_nic *efx = devlink_private->efx;
>> +	char msg[NETLINK_MAX_FMTMSG_LEN];
>> +	int errors_reported = 0;
>> +	int rc;
>> +
>> +	/* Several different MCDI commands are used. We report first error
>> +	 * through extack along with total number of errors. Specific error
>> +	 * information via system messages.
>> +	 */
>> +	rc = efx_devlink_info_board_cfg(efx, req);
>> +	if (rc) {
>> +		sprintf(msg, "Getting board info failed");
>> +		errors_reported++;
>> +	}
>> +	rc = efx_devlink_info_stored_versions(efx, req);
>> +	if (rc) {
>> +		if (!errors_reported)
>> +			sprintf(msg, "Getting stored versions failed");
>> +		errors_reported += rc;
>> +	}
>> +	rc = efx_devlink_info_running_versions(efx, req);
>> +	if (rc) {
>> +		if (!errors_reported)
>> +			sprintf(msg, "Getting board info failed");
>> +		errors_reported++;
>
> Under which circumstances any of the errors above happen? Is it a common
> thing? Or is it result of some fatal event?

They are not common at all. If any of those happen, it is a bad sign, 
and it is more than likely there are more than one because something is 
not working properly. That is the reason I only report first error found 
plus the total number of errors detected.


>
> You treat it like it is quite common, which seems very odd to me.
> If they are rare, just return error right away to the caller.

Well, that is done now. And as I say, I'm not reporting all but just the 
first one, mainly because the buffer limitation with NETLINK_MAX_FMTMSG_LEN.

If errors trigger, a more complete information will appear in system 
messages, so that is the reason with:

+               NL_SET_ERR_MSG_FMT(extack,
+                                  "%s. %d total errors. Check system messages",
+                                  msg, errors_reported);

I guess you are concerned with the extack report being overwhelmed, but 
I do not think that is the case.

>
>
>> +	}
>> +
>> +	if (errors_reported)
>> +		NL_SET_ERR_MSG_FMT(extack,
>> +				   "%s. %d total errors. Check system messages",
>> +				   msg, errors_reported);
>> +	return 0;
>> +}
>> +
>> static const struct devlink_ops sfc_devlink_ops = {
>> +	.info_get			= efx_devlink_info_get,
>> };
> [...]