Re: [Qemu-devel] [PATCH 4/8] ipmi: add FRU support

[Cédric Le Goater]

Hello,

On 01/08/2016 08:41 PM, Corey Minyard wrote:
> On 01/05/2016 11:29 AM, Cédric Le Goater wrote:
>> This patch provides a simplistic FRU support for the IPMI BMC
>> simulator.  The FRU area contains 32 entries * 256 bytes which should
>> be enough to start some simulation.
>>
>> Signed-off-by: Cédric Le Goater <address@hidden>
>> ---
>>   hw/ipmi/ipmi_bmc_sim.c | 119 
>> +++++++++++++++++++++++++++++++++++++++++++++++++
>>   1 file changed, 119 insertions(+)
>>
>> diff --git a/hw/ipmi/ipmi_bmc_sim.c b/hw/ipmi/ipmi_bmc_sim.c
>> index 5db94491b130..60586a67104e 100644
>> --- a/hw/ipmi/ipmi_bmc_sim.c
>> +++ b/hw/ipmi/ipmi_bmc_sim.c
>> @@ -81,6 +81,9 @@
>>   #define IPMI_CMD_ENTER_SDR_REP_UPD_MODE   0x2A
>>   #define IPMI_CMD_EXIT_SDR_REP_UPD_MODE    0x2B
>>   #define IPMI_CMD_RUN_INIT_AGENT           0x2C
>> +#define IPMI_CMD_GET_FRU_AREA_INFO        0x10
>> +#define IPMI_CMD_READ_FRU_DATA            0x11
>> +#define IPMI_CMD_WRITE_FRU_DATA           0x12
>>   #define IPMI_CMD_GET_SEL_INFO             0x40
>>   #define IPMI_CMD_GET_SEL_ALLOC_INFO       0x41
>>   #define IPMI_CMD_RESERVE_SEL              0x42
>> @@ -123,6 +126,14 @@ typedef struct IPMISdr {
>>       uint8_t overflow;
>>   } IPMISdr;
>>   +/* theoretically, the offset being 16bits, it should be 65536 */
>> +#define MAX_FRU_SIZE 256
>> +#define MAX_FRU_ID 32
>> +
>> +typedef struct IPMIFru {
>> +    uint8_t data[MAX_FRU_SIZE][MAX_FRU_ID];
>> +} IPMIFru;
> 
> Instead of a static table like this, I think it would be better to make this 
> configurable somehow.  I say this because I've never seen a system with 32 
> FRU 
> devices on a BMC, but I've seen plenty with FRU data larger than 256 bytes.  
> By default, 1 FRU device with 2048 bytes is pretty reasonable, I think.
> 
> I'm not exactly sure the best way to make it configurable. 

I guess we can use an object property to configure the numbers of FRU devices 
and start with a minimum of 1.

> I assume that you 
> need your platform code to be able to provide that information, and it could 
> be passed in as BMC configuration parameters.  The ability to load the FRU 
> data at startup is probably also necessary.

I will see what API we can provide after doing the above.

Thanks,

C. 

> -corey
> 
>> +
>>   typedef struct IPMISensor {
>>       uint8_t status;
>>       uint8_t reading;
>> @@ -206,6 +217,7 @@ struct IPMIBmcSim {
>>         IPMISel sel;
>>       IPMISdr sdr;
>> +    IPMIFru fru;
>>       IPMISensor sensors[MAX_SENSORS];
>>         /* Odd netfns are for responses, so we only need the even ones. */
>> @@ -1305,6 +1317,110 @@ static void get_sel_info(IPMIBmcSim *ibs,
>>       return;
>>   }
>>   +static void get_fru_area_info(IPMIBmcSim *ibs,
>> +                         uint8_t *cmd, unsigned int cmd_len,
>> +                         uint8_t *rsp, unsigned int *rsp_len,
>> +                         unsigned int max_rsp_len)
>> +{
>> +    uint8_t fruid;
>> +    uint16_t fru_entry_size;
>> +
>> +    IPMI_CHECK_CMD_LEN(3);
>> +
>> +    fruid = cmd[2];
>> +
>> +    if (fruid > MAX_FRU_ID) {
>> +        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        goto out;
>> +    }
>> +
>> +    fru_entry_size = MAX_FRU_SIZE;
>> +
>> +    IPMI_ADD_RSP_DATA(fru_entry_size & 0xff);
>> +    IPMI_ADD_RSP_DATA(fru_entry_size >> 8 & 0xff);
>> +    IPMI_ADD_RSP_DATA(0x0);
>> +out:
>> +    return;
>> +}
>> +
>> +#define min(x, y) ((x) < (y) ? (x) : (y))
>> +#define max(x, y) ((x) > (y) ? (x) : (y))
>> +
>> +static void read_fru_data(IPMIBmcSim *ibs,
>> +                         uint8_t *cmd, unsigned int cmd_len,
>> +                         uint8_t *rsp, unsigned int *rsp_len,
>> +                         unsigned int max_rsp_len)
>> +{
>> +    uint8_t fruid;
>> +    uint16_t offset;
>> +    int i;
>> +    uint8_t *fru_entry;
>> +    unsigned int count;
>> +
>> +    IPMI_CHECK_CMD_LEN(5);
>> +
>> +    fruid = cmd[2];
>> +    offset = (cmd[3] | cmd[4] << 8);
>> +
>> +    if (fruid > MAX_FRU_ID) {
>> +        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        goto out;
>> +    }
>> +
>> +    if (offset >= MAX_FRU_SIZE - 1) {
>> +        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        goto out;
>> +    }
>> +
>> +    fru_entry = ibs->fru.data[fruid];
>> +
>> +    count = min(cmd[5], MAX_FRU_SIZE - offset);
>> +
>> +    IPMI_ADD_RSP_DATA(count & 0xff);
>> +    for (i = 0; i < count; i++) {
>> +        IPMI_ADD_RSP_DATA(fru_entry[offset + i]);
>> +    }
>> +
>> + out:
>> +    return;
>> +}
>> +
>> +static void write_fru_data(IPMIBmcSim *ibs,
>> +                         uint8_t *cmd, unsigned int cmd_len,
>> +                         uint8_t *rsp, unsigned int *rsp_len,
>> +                         unsigned int max_rsp_len)
>> +{
>> +    uint8_t fruid;
>> +    uint16_t offset;
>> +    uint8_t *fru_entry;
>> +    unsigned int count;
>> +
>> +    IPMI_CHECK_CMD_LEN(5);
>> +
>> +    fruid = cmd[2];
>> +    offset = (cmd[3] | cmd[4] << 8);
>> +
>> +    if (fruid > MAX_FRU_ID) {
>> +        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        goto out;
>> +    }
>> +
>> +    if (offset >= MAX_FRU_SIZE - 1) {
>> +        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        goto out;
>> +    }
>> +
>> +    fru_entry = ibs->fru.data[fruid];
>> +
>> +    count = min(cmd_len - 5, MAX_FRU_SIZE - offset);
>> +
>> +    memcpy(fru_entry + offset, cmd + 5, count);
>> +
>> +    IPMI_ADD_RSP_DATA(count & 0xff);
>> + out:
>> +    return;
>> +}
>> +
>>   static void reserve_sel(IPMIBmcSim *ibs,
>>                           uint8_t *cmd, unsigned int cmd_len,
>>                           uint8_t *rsp, unsigned int *rsp_len,
>> @@ -1682,6 +1798,9 @@ static const IPMINetfn app_netfn = {
>>   };
>>     static const IPMICmdHandler storage_cmds[IPMI_NETFN_STORAGE_MAXCMD] = {
>> +    [IPMI_CMD_GET_FRU_AREA_INFO] = get_fru_area_info,
>> +    [IPMI_CMD_READ_FRU_DATA] = read_fru_data,
>> +    [IPMI_CMD_WRITE_FRU_DATA] = write_fru_data,
>>       [IPMI_CMD_GET_SDR_REP_INFO] = get_sdr_rep_info,
>>       [IPMI_CMD_RESERVE_SDR_REP] = reserve_sdr_rep,
>>       [IPMI_CMD_GET_SDR] = get_sdr,
>