I just had a user report to me that the sensor output in FreeIPMI's
ipmi-sensors vs. ipmitool was conflicting. The core cause of the
discrepancy is it appears ipmitool judges an analog vs. discrete sensor
by keying off of a sensor's "analog data format" flag. Such as this
code in sensors.c
int
ipmi_sensor_print_full(struct ipmi_intf *intf,
struct sdr_record_full_sensor *sensor)
{
if (sensor->unit.analog != 3)
return ipmi_sensor_print_full_analog(intf, sensor);
else
return ipmi_sensor_print_full_discrete(intf, sensor);
}
In contrast, FreeIPMI's keys off the event/reading type code to
determine an analog vs. discrete sensor (e.g. event-reading-type-code
01h = "threshold" and 02h-0Ch/6Fh = "discrete").
As I'm going through the IPMI spec, I *think* (and I can be debated)
that the IPMItool approach is wrong. In table 43-1, it says, "If
neither thresholds nor analog reading are provided, this field should be
written 00h", and 00h = "unsigned", 03h = "does not return analog
(numeric) reading".
If the event/reading type code != 01h/threshold, but analog-data-format
= 00h/unsigned, IPMItool will output an invalid/illegal analog reading.
Also, it appears that if analog-data-format == 3h, IPMItool assumes that
event-reading-type-code is == 1h. (from ipmi_sensor_print_full_analog(),
ipmi_sdr_print_sensor_event_status() is called with the numeric_fmt of
ANALOG_SENSOR).
In all fairness, I am now debating if there is a bug in FreeIPMI too.
FreeIPMI does not allow a "discrete only" reading of a threshold sensor.
If the event/reading type code == 01h/threshold, but analog data format
= 03h/"no analog reading", I return an error and say I can't read the
sensor. It appears IPMItool doesn't suffer this.
Needless to say, this is just one motherboard that appears to be doing
something odd/abnormal from the majority of IPMI motherboards out there.
But it's perhaps worth bringing up for discussion on the right
approach/legal approach.
Al
--
Albert Chu
ch...@llnl.gov
Computer Scientist
High Performance Systems Division
Lawrence Livermore National Laboratory
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