Re: [Ipmitool-devel] Can't read sensors on HP DL160

[Hank B. <ha...@jb...>]

Jan,
Most likely HPs fault. There are a lot of poorly designed SDRs.
While not specific to IPMITool, we have attempted to document some of 
the inconsistent practices in reading sensors.
http://www.jblade.com:8080/products/retuli/ipmiClient/doc/programmers/SensorReading.html

As far as bridging. You have just one level and it can go deeper. Each 
bridge looses bytes in the IPMI message until the message can't contain 
number of bytes necessary.
Hank

On 02/22/2011 06:02 AM, Jan Safranek wrote:
> Hi,
>
> current ipmitool cannot read sensors on the aforementioned HW (and also
> DL165 and DL180; DL120 works well). The bug was introduced in version
> 1.8.11, which enables bridging of sensor readings by default:
>
> struct ipmi_rs *
> ipmi_sdr_get_sensor_reading_ipmb(struct ipmi_intf *intf, uint8_t sensor,
> 				 uint8_t target, uint8_t lun)
> {
> /* SNIP */
> 	uint8_t save_addr;
>
> 	save_addr = intf->target_addr;
> 	intf->target_addr = target;
>
> /* request composition snipped out */
> 	rsp = intf->sendrecv(intf,&req);
> 	intf->target_addr = save_addr;
> }
>
> where 'target' and 'lun' are taken directly from SDR (e.g. Owner ID and
> Owner LUN in table 43-1 of IPMI 2.0 spec.)
>
> The HP HW returns some sensors as owned by system software with ID '0'
> (=BIOS, according to IPMI 2.0 spec, table 5-4), i.e. 'target' = 1, and
> the code above tries to bridge the sensor reading from BMC (0x20) to
> address 0x1, which fails. Direct reading of the sensor value from the
> BMC succeeds. Question is, who is to blame? HP for reporting wrong owner
> or ipmitool for trying to bridge the request? The IPMI specification
> does not give me any answer (or I am not able to find it there).
>
> What is the correct behavior? It seems the bridging was added there for
> a reason, I am just not able to see it.
>
> Jan
>
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