Tue, Feb 07, 2023 at 06:24:05PM CET, alejandro.lucero-palau@xxxxxxx wrote:
>
>On 2/7/23 15:10, Lucero Palau, Alejandro wrote:
>> On 2/7/23 14:58, Jiri Pirko wrote:
>>> Tue, Feb 07, 2023 at 03:42:45PM CET, alejandro.lucero-palau@xxxxxxx wrote:
>>>> On 2/2/23 11:58, Jiri Pirko wrote:
>>>>> Thu, Feb 02, 2023 at 12:14:17PM CET, alejandro.lucero-palau@xxxxxxx wrote:
>>>>>> From: Alejandro Lucero <alejandro.lucero-palau@xxxxxxx>
>>>>>>
>>>>>> 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.
>>> No, I'm wondering why you just don't put error message into exack and
>>> return -ESOMEERROR right away.
>> Well, I thought the idea was to give more information to user space
>> about the problem.
>>
>> Previous patchsets were not reporting any error nor error information
>> through extack. Now we have both.
>
>
>Just trying to make more sense of this.
>
>Because that limit with NETLINK_MAX_FMTMSG_LEN, what I think is big
>enough, some control needs to be taken about what to report. It could be
>just to write the buffer with the last error and report that last one
Wait. My point is: fail on the first error returning the error to
info_get() caller. Just that. No accumulation of anything.
>only, with no need of keeping total errors count. But I felt once we
>handle any error, reporting that extra info about the total errors
>detected should not be a problem at all, even if it is an unlikely
>situation.
>
>BTW, I said we were reporting both, the error and the extack error
>message, but I've realized the function was not returning any error but
>always 0, so I'll fix that.
>
>
>>>>>> + }
>>>>>> +
>>>>>> + 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,
>>>>>> };
>>>>> [...]
