Re: [Qemu-devel] [PATCH 1/8] ipmi: fix SDR length value

[Cédric Le Goater]

On 01/05/2016 08:59 PM, Eric Blake wrote:
> On 01/05/2016 10:29 AM, Cédric Le Goater wrote:
> 
> [meta-comment] Your messages were not marked in-reply-to: the 0/8 cover
> letter, but came through as separate threads.  This makes it harder to
> follow, especially in mail clients that sort top-level threads by most
> recent activity on the thread.

Yes. My bad. I put 'thread = false' in my .gitconfig for some reason and
didn't check before sending. This is fixed.

>> The IPMI BMC simulator populates the SDR table with a set of initial
>> SDRs. The length of each SDR is taken from the record itself (byte 4)
>> which does not include the size of the header. But, the full length
>> (header + data) is required by the sdr_add_entry() routine.
>>
>> Signed-off-by: Cédric Le Goater <address@hidden>
>> ---
>>
>>  Maybe we could use a sdr struct/typedef to clarify the code. See
>>  patch 7: "ipmi: introduce an ipmi_bmc_init_sensor() API"
>>
>>  hw/ipmi/ipmi_bmc_sim.c | 14 +++++++-------
>>  1 file changed, 7 insertions(+), 7 deletions(-)
>>
>> diff --git a/hw/ipmi/ipmi_bmc_sim.c b/hw/ipmi/ipmi_bmc_sim.c
>> index 0a59e539f549..559e1398d669 100644
>> --- a/hw/ipmi/ipmi_bmc_sim.c
>> +++ b/hw/ipmi/ipmi_bmc_sim.c
>> @@ -362,7 +362,7 @@ static int sdr_find_entry(IPMISdr *sdr, uint16_t recid,
>>  
>>      while (pos < sdr->next_free) {
>>          uint16_t trec = sdr->sdr[pos] | (sdr->sdr[pos + 1] << 8);
>> -        unsigned int nextpos = pos + sdr->sdr[pos + 4];
>> +        unsigned int nextpos = pos + sdr->sdr[pos + 4] + 5;
> 
> 5 feels like a magic number; should you use a #define and name it?

Yes. 5 being the sdr header length. 

The simulator uses a lot of these byte offsets and I think the code 
would gain to use a struct as proposed in patch 7: 
  
  "ipmi: introduce an ipmi_bmc_init_sensor() API". 

Corey, is there a reason for not doing so ? 

>> @@ -1709,20 +1709,20 @@ static void ipmi_sim_init(Object *obj)
>>      for (i = 0;;) {
>>          int len;
>>          if ((i + 5) > sizeof(init_sdrs)) {
>> -            error_report("Problem with recid 0x%4.4x: \n", i);
>> +            error_report("Problem with recid 0x%4.4x\n", i);
> 
> Please drop the trailing \n as long as you are touching this.

Sure.

Thanks,

C.