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Re: [Qemu-devel] [PATCH v2 02/10] ipmi: replace IPMI_ADD_RSP_DATA() macr


From: Cédric Le Goater
Subject: Re: [Qemu-devel] [PATCH v2 02/10] ipmi: replace IPMI_ADD_RSP_DATA() macro with inline helpers
Date: Wed, 2 Mar 2016 18:53:08 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.5.0

On 03/02/2016 11:25 AM, Michael S. Tsirkin wrote:
> On Wed, Mar 02, 2016 at 11:14:50AM +0100, Cédric Le Goater wrote:
>> The IPMI command handlers in the BMC simulator use a macro
>> IPMI_ADD_RSP_DATA() to push bytes in a response buffer. The macro
>> hides the fact that it implicitly uses variables local to the handler,
>> which is misleading.
>>
>> This patch introduces a simple 'struct rsp_buffer' and inlined helper
>> routines to store byte(s) in a response buffer. rsp_buffer_push()
>> replaces the macro IPMI_ADD_RSP_DATA() and rsp_buffer_pushmore() is
>> new helper to push multiple bytes. The latest is used in the command
>> handlers get_msg() and get_sdr() which are manipulating the buffer
>> directly.
>>
>> Signed-off-by: Cédric Le Goater <address@hidden>
> 
> 
> Looks good overall.
> Some stylistic comments.
> 
>> ---
>>  hw/ipmi/ipmi_bmc_sim.c | 482 
>> +++++++++++++++++++++++--------------------------
>>  1 file changed, 229 insertions(+), 253 deletions(-)
>>
>> diff --git a/hw/ipmi/ipmi_bmc_sim.c b/hw/ipmi/ipmi_bmc_sim.c
>> index 30b9fb48ea2d..32efb87c8232 100644
>> --- a/hw/ipmi/ipmi_bmc_sim.c
>> +++ b/hw/ipmi/ipmi_bmc_sim.c
>> @@ -153,14 +153,14 @@ typedef struct IPMISensor {
>>  #define IPMI_WATCHDOG_SENSOR 0
>>  
>>  typedef struct IPMIBmcSim IPMIBmcSim;
>> +struct rsp_buffer;
>>
> 
> typedef struct RspBuffer RspBuffer;

OK. So that's the rule for structs in qemu. It is not that clear
when you look at the code around. I will change. np.

>>  #define MAX_NETFNS 64
>>  
>>  typedef struct IPMICmdHandler {
>>      void (*cmd_handler)(IPMIBmcSim *s,
>>                          uint8_t *cmd, unsigned int cmd_len,
>> -                        uint8_t *rsp, unsigned int *rsp_len,
>> -                        unsigned int max_rsp_len);
>> +                        struct rsp_buffer *rsp);
>>      unsigned int cmd_len_min;
>>  } IPMICmdHandler;
>>  
>> @@ -263,22 +263,41 @@ struct IPMIBmcSim {
>>  #define IPMI_BMC_WATCHDOG_ACTION_POWER_DOWN      2
>>  #define IPMI_BMC_WATCHDOG_ACTION_POWER_CYCLE     3
>>  
>> +struct rsp_buffer {
>> +    uint8_t buffer[MAX_IPMI_MSG_SIZE];
>> +    unsigned int len;
>> +    unsigned int max_len;
>> +};
>> +
>> +#define RSP_BUFFER_INITIALIZER { { 0 }, 0, MAX_IPMI_MSG_SIZE }
> 
> max_len seems to always be a constant. So just use ARRAY_SIZE(buffer)
> and RSP_BUFFER_INITIALIZER can then be replaced with plain { };

Yes. or : 

#define RSP_BUFFER_INITIALIZER \
        { { 0 }, 0, ARRAY_SIZE(((struct rsp_buffer *)NULL)->buffer) }

This is purely stylistic. I agree that specifying MAX_IPMI_MSG_SIZE
twice is ugly. It needs a fix.

>>  
>>  /* Add a byte to the response. */
>> -#define IPMI_ADD_RSP_DATA(b) \
>> -    do {                                                   \
>> -        if (*rsp_len >= max_rsp_len) {                     \
>> -            rsp[2] = IPMI_CC_REQUEST_DATA_TRUNCATED;       \
>> -            return;                                        \
>> -        }                                                  \
>> -        rsp[(*rsp_len)++] = (b);                           \
>> -    } while (0)
>> +static inline void rsp_buffer_push(struct rsp_buffer *rsp, uint8_t byte)
>> +{
>> +    if (rsp->len >= rsp->max_len) {
> 
> Why not simply
>       rsp->len >= ARRAY_SIZE(rsp->buffer)
> ?
> 
> 
> 
>> +        rsp->buffer[2] = IPMI_CC_REQUEST_DATA_TRUNCATED;
>> +        return;
>> +    }
>> +    rsp->buffer[rsp->len++] = byte;
>> +}
>> +
>> +static inline void rsp_buffer_pushmore(struct rsp_buffer *rsp, uint8_t 
>> *bytes,
>> +                                       unsigned int n)
>> +{
>> +    if (rsp->len + n >= rsp->max_len) {
>> +        rsp->buffer[2] = IPMI_CC_REQUEST_DATA_TRUNCATED;
>> +        return;
>> +    }
>> +
>> +    memcpy(&rsp->buffer[rsp->len], bytes, n);
>> +    rsp->len += n;
>> +}
>>  
>>  /* Check that the reservation in the command is valid. */
>>  #define IPMI_CHECK_RESERVATION(off, r) \
>>      do {                                                   \
>>          if ((cmd[off] | (cmd[off + 1] << 8)) != r) {       \
>> -            rsp[2] = IPMI_CC_INVALID_RESERVATION;          \
>> +            rsp->buffer[2] = IPMI_CC_INVALID_RESERVATION;     \
>>              return;                                        \
>>          }                                                  \
>>      } while (0)
>> @@ -585,35 +604,32 @@ static void ipmi_sim_handle_command(IPMIBmc *b,
>>      IPMIInterface *s = ibs->parent.intf;
>>      IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
>>      unsigned int netfn;
>> -    uint8_t rsp[MAX_IPMI_MSG_SIZE];
>> -    unsigned int rsp_len_holder = 0;
>> -    unsigned int *rsp_len = &rsp_len_holder;
>> -    unsigned int max_rsp_len = sizeof(rsp);
>> +    struct rsp_buffer rsp = RSP_BUFFER_INITIALIZER;
>>  
>>      /* Set up the response, set the low bit of NETFN. */
>>      /* Note that max_rsp_len must be at least 3 */
>> -    if (max_rsp_len < 3) {
>> -        rsp[2] = IPMI_CC_REQUEST_DATA_TRUNCATED;
>> +    if (rsp.max_len < 3) {
>> +        rsp.buffer[2] = IPMI_CC_REQUEST_DATA_TRUNCATED;
>>          goto out;
>>      }
>>  
>> -    IPMI_ADD_RSP_DATA(cmd[0] | 0x04);
>> -    IPMI_ADD_RSP_DATA(cmd[1]);
>> -    IPMI_ADD_RSP_DATA(0); /* Assume success */
>> +    rsp_buffer_push(&rsp, cmd[0] | 0x04);
>> +    rsp_buffer_push(&rsp, cmd[1]);
>> +    rsp_buffer_push(&rsp, 0); /* Assume success */
>>  
>>      /* If it's too short or it was truncated, return an error. */
>>      if (cmd_len < 2) {
>> -        rsp[2] = IPMI_CC_REQUEST_DATA_LENGTH_INVALID;
>> +        rsp.buffer[2] = IPMI_CC_REQUEST_DATA_LENGTH_INVALID;
>>          goto out;
>>      }
>>      if (cmd_len > max_cmd_len) {
>> -        rsp[2] = IPMI_CC_REQUEST_DATA_TRUNCATED;
>> +        rsp.buffer[2] = IPMI_CC_REQUEST_DATA_TRUNCATED;
>>          goto out;
>>      }
>>  
>>      if ((cmd[0] & 0x03) != 0) {
>>          /* Only have stuff on LUN 0 */
>> -        rsp[2] = IPMI_CC_COMMAND_INVALID_FOR_LUN;
>> +        rsp.buffer[2] = IPMI_CC_COMMAND_INVALID_FOR_LUN;
>>          goto out;
>>      }
>>  
>> @@ -623,20 +639,20 @@ static void ipmi_sim_handle_command(IPMIBmc *b,
>>      if ((netfn & 1) || !ibs->netfns[netfn / 2] ||
>>          (cmd[1] >= ibs->netfns[netfn / 2]->cmd_nums) ||
>>          (!ibs->netfns[netfn / 2]->cmd_handlers[cmd[1]].cmd_handler)) {
>> -        rsp[2] = IPMI_CC_INVALID_CMD;
>> +        rsp.buffer[2] = IPMI_CC_INVALID_CMD;
>>          goto out;
>>      }
>>  
>>      if (cmd_len < ibs->netfns[netfn / 2]->cmd_handlers[cmd[1]].cmd_len_min) 
>> {
>> -        rsp[2] = IPMI_CC_REQUEST_DATA_LENGTH_INVALID;
>> +        rsp.buffer[2] = IPMI_CC_REQUEST_DATA_LENGTH_INVALID;
>>          goto out;
>>      }
>>  
>>      ibs->netfns[netfn / 2]->cmd_handlers[cmd[1]].cmd_handler(ibs, cmd, 
>> cmd_len,
>> -                                                rsp, rsp_len, max_rsp_len);
>> +                                                &rsp);
>>  
>>   out:
>> -    k->handle_rsp(s, msg_id, rsp, *rsp_len);
>> +    k->handle_rsp(s, msg_id, rsp.buffer, rsp.len);
>>  
>>      next_timeout(ibs);
>>  }
>> @@ -711,86 +727,82 @@ static void ipmi_sim_handle_timeout(IPMIBmcSim *ibs)
>>  
>>  static void chassis_capabilities(IPMIBmcSim *ibs,
>>                                   uint8_t *cmd, unsigned int cmd_len,
>> -                                 uint8_t *rsp, unsigned int *rsp_len,
>> -                                 unsigned int max_rsp_len)
>> +                                 struct rsp_buffer *rsp)
>>  {
>> -    IPMI_ADD_RSP_DATA(0);
>> -    IPMI_ADD_RSP_DATA(ibs->parent.slave_addr);
>> -    IPMI_ADD_RSP_DATA(ibs->parent.slave_addr);
>> -    IPMI_ADD_RSP_DATA(ibs->parent.slave_addr);
>> -    IPMI_ADD_RSP_DATA(ibs->parent.slave_addr);
>> +    rsp_buffer_push(rsp, 0);
>> +    rsp_buffer_push(rsp, ibs->parent.slave_addr);
>> +    rsp_buffer_push(rsp, ibs->parent.slave_addr);
>> +    rsp_buffer_push(rsp, ibs->parent.slave_addr);
>> +    rsp_buffer_push(rsp, ibs->parent.slave_addr);
>>  }
>>  
>>  static void chassis_status(IPMIBmcSim *ibs,
>>                             uint8_t *cmd, unsigned int cmd_len,
>> -                           uint8_t *rsp, unsigned int *rsp_len,
>> -                           unsigned int max_rsp_len)
>> +                           struct rsp_buffer *rsp)
>>  {
>> -    IPMI_ADD_RSP_DATA(0x61); /* Unknown power restore, power is on */
>> -    IPMI_ADD_RSP_DATA(0);
>> -    IPMI_ADD_RSP_DATA(0);
>> -    IPMI_ADD_RSP_DATA(0);
>> +    rsp_buffer_push(rsp, 0x61); /* Unknown power restore, power is on */
>> +    rsp_buffer_push(rsp, 0);
>> +    rsp_buffer_push(rsp, 0);
>> +    rsp_buffer_push(rsp, 0);
>>  }
>>  
>>  static void chassis_control(IPMIBmcSim *ibs,
>>                              uint8_t *cmd, unsigned int cmd_len,
>> -                            uint8_t *rsp, unsigned int *rsp_len,
>> -                            unsigned int max_rsp_len)
>> +                            struct rsp_buffer *rsp)
>>  {
>>      IPMIInterface *s = ibs->parent.intf;
>>      IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
>>  
>>      switch (cmd[2] & 0xf) {
>>      case 0: /* power down */
>> -        rsp[2] = k->do_hw_op(s, IPMI_POWEROFF_CHASSIS, 0);
>> +        rsp->buffer[2] = k->do_hw_op(s, IPMI_POWEROFF_CHASSIS, 0);
>>          break;
>>      case 1: /* power up */
>> -        rsp[2] = k->do_hw_op(s, IPMI_POWERON_CHASSIS, 0);
>> +        rsp->buffer[2] = k->do_hw_op(s, IPMI_POWERON_CHASSIS, 0);
>>          break;
>>      case 2: /* power cycle */
>> -        rsp[2] = k->do_hw_op(s, IPMI_POWERCYCLE_CHASSIS, 0);
>> +        rsp->buffer[2] = k->do_hw_op(s, IPMI_POWERCYCLE_CHASSIS, 0);
>>          break;
>>      case 3: /* hard reset */
>> -        rsp[2] = k->do_hw_op(s, IPMI_RESET_CHASSIS, 0);
>> +        rsp->buffer[2] = k->do_hw_op(s, IPMI_RESET_CHASSIS, 0);
>>          break;
>>      case 4: /* pulse diagnostic interrupt */
>> -        rsp[2] = k->do_hw_op(s, IPMI_PULSE_DIAG_IRQ, 0);
>> +        rsp->buffer[2] = k->do_hw_op(s, IPMI_PULSE_DIAG_IRQ, 0);
>>          break;
>>      case 5: /* soft shutdown via ACPI by overtemp emulation */
>> -        rsp[2] = k->do_hw_op(s,
>> +        rsp->buffer[2] = k->do_hw_op(s,
>>                               IPMI_SHUTDOWN_VIA_ACPI_OVERTEMP, 0);
>>          break;
>>      default:
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>          return;
>>      }
>>  }
>>  
>>  static void chassis_get_sys_restart_cause(IPMIBmcSim *ibs,
>>                             uint8_t *cmd, unsigned int cmd_len,
>> -                           uint8_t *rsp, unsigned int *rsp_len,
>> -                           unsigned int max_rsp_len)
>> +                           struct rsp_buffer *rsp)
>> +
>>  {
>> -    IPMI_ADD_RSP_DATA(ibs->restart_cause & 0xf); /* Restart Cause */
>> -    IPMI_ADD_RSP_DATA(0);  /* Channel 0 */
>> +    rsp_buffer_push(rsp, ibs->restart_cause & 0xf); /* Restart Cause */
>> +    rsp_buffer_push(rsp, 0);  /* Channel 0 */
>>  }
>>  
>>  static void get_device_id(IPMIBmcSim *ibs,
>>                            uint8_t *cmd, unsigned int cmd_len,
>> -                          uint8_t *rsp, unsigned int *rsp_len,
>> -                          unsigned int max_rsp_len)
>> -{
>> -    IPMI_ADD_RSP_DATA(ibs->device_id);
>> -    IPMI_ADD_RSP_DATA(ibs->device_rev & 0xf);
>> -    IPMI_ADD_RSP_DATA(ibs->fwrev1 & 0x7f);
>> -    IPMI_ADD_RSP_DATA(ibs->fwrev2);
>> -    IPMI_ADD_RSP_DATA(ibs->ipmi_version);
>> -    IPMI_ADD_RSP_DATA(0x07); /* sensor, SDR, and SEL. */
>> -    IPMI_ADD_RSP_DATA(ibs->mfg_id[0]);
>> -    IPMI_ADD_RSP_DATA(ibs->mfg_id[1]);
>> -    IPMI_ADD_RSP_DATA(ibs->mfg_id[2]);
>> -    IPMI_ADD_RSP_DATA(ibs->product_id[0]);
>> -    IPMI_ADD_RSP_DATA(ibs->product_id[1]);
>> +                          struct rsp_buffer *rsp)
>> +{
>> +    rsp_buffer_push(rsp, ibs->device_id);
>> +    rsp_buffer_push(rsp, ibs->device_rev & 0xf);
>> +    rsp_buffer_push(rsp, ibs->fwrev1 & 0x7f);
>> +    rsp_buffer_push(rsp, ibs->fwrev2);
>> +    rsp_buffer_push(rsp, ibs->ipmi_version);
>> +    rsp_buffer_push(rsp, 0x07); /* sensor, SDR, and SEL. */
>> +    rsp_buffer_push(rsp, ibs->mfg_id[0]);
>> +    rsp_buffer_push(rsp, ibs->mfg_id[1]);
>> +    rsp_buffer_push(rsp, ibs->mfg_id[2]);
>> +    rsp_buffer_push(rsp, ibs->product_id[0]);
>> +    rsp_buffer_push(rsp, ibs->product_id[1]);
>>  }
>>  
>>  static void set_global_enables(IPMIBmcSim *ibs, uint8_t val)
>> @@ -809,8 +821,7 @@ static void set_global_enables(IPMIBmcSim *ibs, uint8_t 
>> val)
>>  
>>  static void cold_reset(IPMIBmcSim *ibs,
>>                         uint8_t *cmd, unsigned int cmd_len,
>> -                       uint8_t *rsp, unsigned int *rsp_len,
>> -                       unsigned int max_rsp_len)
>> +                       struct rsp_buffer *rsp)
>>  {
>>      IPMIInterface *s = ibs->parent.intf;
>>      IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
>> @@ -825,8 +836,7 @@ static void cold_reset(IPMIBmcSim *ibs,
>>  
>>  static void warm_reset(IPMIBmcSim *ibs,
>>                         uint8_t *cmd, unsigned int cmd_len,
>> -                       uint8_t *rsp, unsigned int *rsp_len,
>> -                       unsigned int max_rsp_len)
>> +                       struct rsp_buffer *rsp)
>>  {
>>      IPMIInterface *s = ibs->parent.intf;
>>      IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
>> @@ -836,55 +846,49 @@ static void warm_reset(IPMIBmcSim *ibs,
>>      }
>>  }
>>  static void set_acpi_power_state(IPMIBmcSim *ibs,
>> -                          uint8_t *cmd, unsigned int cmd_len,
>> -                          uint8_t *rsp, unsigned int *rsp_len,
>> -                          unsigned int max_rsp_len)
>> +                                 uint8_t *cmd, unsigned int cmd_len,
>> +                                 struct rsp_buffer *rsp)
>>  {
>>      ibs->acpi_power_state[0] = cmd[2];
>>      ibs->acpi_power_state[1] = cmd[3];
>>  }
>>  
>>  static void get_acpi_power_state(IPMIBmcSim *ibs,
>> -                          uint8_t *cmd, unsigned int cmd_len,
>> -                          uint8_t *rsp, unsigned int *rsp_len,
>> -                          unsigned int max_rsp_len)
>> +                                 uint8_t *cmd, unsigned int cmd_len,
>> +                                 struct rsp_buffer *rsp)
>>  {
>> -    IPMI_ADD_RSP_DATA(ibs->acpi_power_state[0]);
>> -    IPMI_ADD_RSP_DATA(ibs->acpi_power_state[1]);
>> +    rsp_buffer_push(rsp, ibs->acpi_power_state[0]);
>> +    rsp_buffer_push(rsp, ibs->acpi_power_state[1]);
>>  }
>>  
>>  static void get_device_guid(IPMIBmcSim *ibs,
>> -                          uint8_t *cmd, unsigned int cmd_len,
>> -                          uint8_t *rsp, unsigned int *rsp_len,
>> -                          unsigned int max_rsp_len)
>> +                            uint8_t *cmd, unsigned int cmd_len,
>> +                            struct rsp_buffer *rsp)
>>  {
>>      unsigned int i;
>>  
>>      for (i = 0; i < 16; i++) {
>> -        IPMI_ADD_RSP_DATA(ibs->uuid[i]);
>> +        rsp_buffer_push(rsp, ibs->uuid[i]);
>>      }
>>  }
>>  
>>  static void set_bmc_global_enables(IPMIBmcSim *ibs,
>>                                     uint8_t *cmd, unsigned int cmd_len,
>> -                                   uint8_t *rsp, unsigned int *rsp_len,
>> -                                   unsigned int max_rsp_len)
>> +                                   struct rsp_buffer *rsp)
>>  {
>>      set_global_enables(ibs, cmd[2]);
>>  }
>>  
>>  static void get_bmc_global_enables(IPMIBmcSim *ibs,
>>                                     uint8_t *cmd, unsigned int cmd_len,
>> -                                   uint8_t *rsp, unsigned int *rsp_len,
>> -                                   unsigned int max_rsp_len)
>> +                                   struct rsp_buffer *rsp)
>>  {
>> -    IPMI_ADD_RSP_DATA(ibs->bmc_global_enables);
>> +    rsp_buffer_push(rsp, ibs->bmc_global_enables);
>>  }
>>  
>>  static void clr_msg_flags(IPMIBmcSim *ibs,
>>                            uint8_t *cmd, unsigned int cmd_len,
>> -                          uint8_t *rsp, unsigned int *rsp_len,
>> -                          unsigned int max_rsp_len)
>> +                          struct rsp_buffer *rsp)
>>  {
>>      IPMIInterface *s = ibs->parent.intf;
>>      IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
>> @@ -895,27 +899,25 @@ static void clr_msg_flags(IPMIBmcSim *ibs,
>>  
>>  static void get_msg_flags(IPMIBmcSim *ibs,
>>                            uint8_t *cmd, unsigned int cmd_len,
>> -                          uint8_t *rsp, unsigned int *rsp_len,
>> -                          unsigned int max_rsp_len)
>> +                          struct rsp_buffer *rsp)
>>  {
>> -    IPMI_ADD_RSP_DATA(ibs->msg_flags);
>> +    rsp_buffer_push(rsp, ibs->msg_flags);
>>  }
>>  
>>  static void read_evt_msg_buf(IPMIBmcSim *ibs,
>>                               uint8_t *cmd, unsigned int cmd_len,
>> -                             uint8_t *rsp, unsigned int *rsp_len,
>> -                            unsigned int max_rsp_len)
>> +                             struct rsp_buffer *rsp)
>>  {
>>      IPMIInterface *s = ibs->parent.intf;
>>      IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
>>      unsigned int i;
>>  
>>      if (!(ibs->msg_flags & IPMI_BMC_MSG_FLAG_EVT_BUF_FULL)) {
>> -        rsp[2] = 0x80;
>> +        rsp->buffer[2] = 0x80;
>>          return;
>>      }
>>      for (i = 0; i < 16; i++) {
>> -        IPMI_ADD_RSP_DATA(ibs->evtbuf[i]);
>> +        rsp_buffer_push(rsp, ibs->evtbuf[i]);
>>      }
>>      ibs->msg_flags &= ~IPMI_BMC_MSG_FLAG_EVT_BUF_FULL;
>>      k->set_atn(s, attn_set(ibs), attn_irq_enabled(ibs));
>> @@ -923,21 +925,18 @@ static void read_evt_msg_buf(IPMIBmcSim *ibs,
>>  
>>  static void get_msg(IPMIBmcSim *ibs,
>>                      uint8_t *cmd, unsigned int cmd_len,
>> -                    uint8_t *rsp, unsigned int *rsp_len,
>> -                    unsigned int max_rsp_len)
>> +                    struct rsp_buffer *rsp)
>>  {
>>      IPMIRcvBufEntry *msg;
>>  
>>      qemu_mutex_lock(&ibs->lock);
>>      if (QTAILQ_EMPTY(&ibs->rcvbufs)) {
>> -        rsp[2] = 0x80; /* Queue empty */
>> +        rsp->buffer[2] = 0x80; /* Queue empty */
>>          goto out;
>>      }
>> -    rsp[3] = 0; /* Channel 0 */
>> -    *rsp_len += 1;
>> +    rsp_buffer_push(rsp, 0); /* Channel 0 */
>>      msg = QTAILQ_FIRST(&ibs->rcvbufs);
>> -    memcpy(rsp + 4, msg->buf, msg->len);
>> -    *rsp_len += msg->len;
>> +    rsp_buffer_pushmore(rsp, msg->buf, msg->len);
>>      QTAILQ_REMOVE(&ibs->rcvbufs, msg, entry);
>>      g_free(msg);
>>  
>> @@ -966,8 +965,7 @@ ipmb_checksum(unsigned char *data, int size, unsigned 
>> char csum)
>>  
>>  static void send_msg(IPMIBmcSim *ibs,
>>                       uint8_t *cmd, unsigned int cmd_len,
>> -                     uint8_t *rsp, unsigned int *rsp_len,
>> -                     unsigned int max_rsp_len)
>> +                     struct rsp_buffer *rsp)
>>  {
>>      IPMIInterface *s = ibs->parent.intf;
>>      IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
>> @@ -977,18 +975,18 @@ static void send_msg(IPMIBmcSim *ibs,
>>  
>>      if (cmd[2] != 0) {
>>          /* We only handle channel 0 with no options */
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>          return;
>>      }
>>  
>>      if (cmd_len < 10) {
>> -        rsp[2] = IPMI_CC_REQUEST_DATA_LENGTH_INVALID;
>> +        rsp->buffer[2] = IPMI_CC_REQUEST_DATA_LENGTH_INVALID;
>>          return;
>>      }
>>  
>>      if (cmd[3] != 0x40) {
>>          /* We only emulate a MC at address 0x40. */
>> -        rsp[2] = 0x83; /* NAK on write */
>> +        rsp->buffer[2] = 0x83; /* NAK on write */
>>          return;
>>      }
>>  
>> @@ -1074,11 +1072,10 @@ static void do_watchdog_reset(IPMIBmcSim *ibs)
>>  
>>  static void reset_watchdog_timer(IPMIBmcSim *ibs,
>>                                   uint8_t *cmd, unsigned int cmd_len,
>> -                                 uint8_t *rsp, unsigned int *rsp_len,
>> -                                 unsigned int max_rsp_len)
>> +                                 struct rsp_buffer *rsp)
>>  {
>>      if (!ibs->watchdog_initialized) {
>> -        rsp[2] = 0x80;
>> +        rsp->buffer[2] = 0x80;
>>          return;
>>      }
>>      do_watchdog_reset(ibs);
>> @@ -1086,8 +1083,7 @@ static void reset_watchdog_timer(IPMIBmcSim *ibs,
>>  
>>  static void set_watchdog_timer(IPMIBmcSim *ibs,
>>                                 uint8_t *cmd, unsigned int cmd_len,
>> -                               uint8_t *rsp, unsigned int *rsp_len,
>> -                               unsigned int max_rsp_len)
>> +                               struct rsp_buffer *rsp)
>>  {
>>      IPMIInterface *s = ibs->parent.intf;
>>      IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
>> @@ -1095,7 +1091,7 @@ static void set_watchdog_timer(IPMIBmcSim *ibs,
>>  
>>      val = cmd[2] & 0x7; /* Validate use */
>>      if (val == 0 || val > 5) {
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>          return;
>>      }
>>      val = cmd[3] & 0x7; /* Validate action */
>> @@ -1104,22 +1100,22 @@ static void set_watchdog_timer(IPMIBmcSim *ibs,
>>          break;
>>  
>>      case IPMI_BMC_WATCHDOG_ACTION_RESET:
>> -        rsp[2] = k->do_hw_op(s, IPMI_RESET_CHASSIS, 1);
>> +        rsp->buffer[2] = k->do_hw_op(s, IPMI_RESET_CHASSIS, 1);
>>          break;
>>  
>>      case IPMI_BMC_WATCHDOG_ACTION_POWER_DOWN:
>> -        rsp[2] = k->do_hw_op(s, IPMI_POWEROFF_CHASSIS, 1);
>> +        rsp->buffer[2] = k->do_hw_op(s, IPMI_POWEROFF_CHASSIS, 1);
>>          break;
>>  
>>      case IPMI_BMC_WATCHDOG_ACTION_POWER_CYCLE:
>> -        rsp[2] = k->do_hw_op(s, IPMI_POWERCYCLE_CHASSIS, 1);
>> +        rsp->buffer[2] = k->do_hw_op(s, IPMI_POWERCYCLE_CHASSIS, 1);
>>          break;
>>  
>>      default:
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>      }
>> -    if (rsp[2]) {
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +    if (rsp->buffer[2]) {
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>          return;
>>      }
>>  
>> @@ -1132,14 +1128,14 @@ static void set_watchdog_timer(IPMIBmcSim *ibs,
>>      case IPMI_BMC_WATCHDOG_PRE_NMI:
>>          if (!k->do_hw_op(s, IPMI_SEND_NMI, 1)) {
>>              /* NMI not supported. */
>> -            rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +            rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>              return;
>>          }
>>          break;
>>  
>>      default:
>>          /* We don't support PRE_SMI */
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>          return;
>>      }
>>  
>> @@ -1158,60 +1154,56 @@ static void set_watchdog_timer(IPMIBmcSim *ibs,
>>  
>>  static void get_watchdog_timer(IPMIBmcSim *ibs,
>>                                 uint8_t *cmd, unsigned int cmd_len,
>> -                               uint8_t *rsp, unsigned int *rsp_len,
>> -                               unsigned int max_rsp_len)
>> +                               struct rsp_buffer *rsp)
>>  {
>> -    IPMI_ADD_RSP_DATA(ibs->watchdog_use);
>> -    IPMI_ADD_RSP_DATA(ibs->watchdog_action);
>> -    IPMI_ADD_RSP_DATA(ibs->watchdog_pretimeout);
>> -    IPMI_ADD_RSP_DATA(ibs->watchdog_expired);
>> +    rsp_buffer_push(rsp, ibs->watchdog_use);
>> +    rsp_buffer_push(rsp, ibs->watchdog_action);
>> +    rsp_buffer_push(rsp, ibs->watchdog_pretimeout);
>> +    rsp_buffer_push(rsp, ibs->watchdog_expired);
>>      if (ibs->watchdog_running) {
>>          long timeout;
>>          timeout = ((ibs->watchdog_expiry - ipmi_getmonotime() + 50000000)
>>                     / 100000000);
>> -        IPMI_ADD_RSP_DATA(timeout & 0xff);
>> -        IPMI_ADD_RSP_DATA((timeout >> 8) & 0xff);
>> +        rsp_buffer_push(rsp, timeout & 0xff);
>> +        rsp_buffer_push(rsp, (timeout >> 8) & 0xff);
>>      } else {
>> -        IPMI_ADD_RSP_DATA(0);
>> -        IPMI_ADD_RSP_DATA(0);
>> +        rsp_buffer_push(rsp, 0);
>> +        rsp_buffer_push(rsp, 0);
>>      }
>>  }
>>  
>>  static void get_sdr_rep_info(IPMIBmcSim *ibs,
>>                               uint8_t *cmd, unsigned int cmd_len,
>> -                             uint8_t *rsp, unsigned int *rsp_len,
>> -                             unsigned int max_rsp_len)
>> +                             struct rsp_buffer *rsp)
>>  {
>>      unsigned int i;
>>  
>> -    IPMI_ADD_RSP_DATA(0x51); /* Conform to IPMI 1.5 spec */
>> -    IPMI_ADD_RSP_DATA(ibs->sdr.next_rec_id & 0xff);
>> -    IPMI_ADD_RSP_DATA((ibs->sdr.next_rec_id >> 8) & 0xff);
>> -    IPMI_ADD_RSP_DATA((MAX_SDR_SIZE - ibs->sdr.next_free) & 0xff);
>> -    IPMI_ADD_RSP_DATA(((MAX_SDR_SIZE - ibs->sdr.next_free) >> 8) & 0xff);
>> +    rsp_buffer_push(rsp, 0x51); /* Conform to IPMI 1.5 spec */
>> +    rsp_buffer_push(rsp, ibs->sdr.next_rec_id & 0xff);
>> +    rsp_buffer_push(rsp, (ibs->sdr.next_rec_id >> 8) & 0xff);
>> +    rsp_buffer_push(rsp, (MAX_SDR_SIZE - ibs->sdr.next_free) & 0xff);
>> +    rsp_buffer_push(rsp, ((MAX_SDR_SIZE - ibs->sdr.next_free) >> 8) & 0xff);
>>      for (i = 0; i < 4; i++) {
>> -        IPMI_ADD_RSP_DATA(ibs->sdr.last_addition[i]);
>> +        rsp_buffer_push(rsp, ibs->sdr.last_addition[i]);
>>      }
>>      for (i = 0; i < 4; i++) {
>> -        IPMI_ADD_RSP_DATA(ibs->sdr.last_clear[i]);
>> +        rsp_buffer_push(rsp, ibs->sdr.last_clear[i]);
>>      }
>>      /* Only modal support, reserve supported */
>> -    IPMI_ADD_RSP_DATA((ibs->sdr.overflow << 7) | 0x22);
>> +    rsp_buffer_push(rsp, (ibs->sdr.overflow << 7) | 0x22);
>>  }
>>  
>>  static void reserve_sdr_rep(IPMIBmcSim *ibs,
>>                              uint8_t *cmd, unsigned int cmd_len,
>> -                            uint8_t *rsp, unsigned int *rsp_len,
>> -                            unsigned int max_rsp_len)
>> +                            struct rsp_buffer *rsp)
>>  {
>> -    IPMI_ADD_RSP_DATA(ibs->sdr.reservation & 0xff);
>> -    IPMI_ADD_RSP_DATA((ibs->sdr.reservation >> 8) & 0xff);
>> +    rsp_buffer_push(rsp, ibs->sdr.reservation & 0xff);
>> +    rsp_buffer_push(rsp, (ibs->sdr.reservation >> 8) & 0xff);
>>  }
>>  
>>  static void get_sdr(IPMIBmcSim *ibs,
>>                      uint8_t *cmd, unsigned int cmd_len,
>> -                    uint8_t *rsp, unsigned int *rsp_len,
>> -                    unsigned int max_rsp_len)
>> +                    struct rsp_buffer *rsp)
>>  {
>>      unsigned int pos;
>>      uint16_t nextrec;
>> @@ -1223,108 +1215,103 @@ static void get_sdr(IPMIBmcSim *ibs,
>>      pos = 0;
>>      if (sdr_find_entry(&ibs->sdr, cmd[4] | (cmd[5] << 8),
>>                         &pos, &nextrec)) {
>> -        rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>> +        rsp->buffer[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>>          return;
>>      }
>>  
>>      sdrh = (struct ipmi_sdr_header *) &ibs->sdr.sdr[pos];
>>  
>>      if (cmd[6] > ipmi_sdr_length(sdrh)) {
>> -        rsp[2] = IPMI_CC_PARM_OUT_OF_RANGE;
>> +        rsp->buffer[2] = IPMI_CC_PARM_OUT_OF_RANGE;
>>          return;
>>      }
>>  
>> -    IPMI_ADD_RSP_DATA(nextrec & 0xff);
>> -    IPMI_ADD_RSP_DATA((nextrec >> 8) & 0xff);
>> +    rsp_buffer_push(rsp, nextrec & 0xff);
>> +    rsp_buffer_push(rsp, (nextrec >> 8) & 0xff);
>>  
>>      if (cmd[7] == 0xff) {
>>          cmd[7] = ipmi_sdr_length(sdrh) - cmd[6];
>>      }
>>  
>> -    if ((cmd[7] + *rsp_len) > max_rsp_len) {
>> -        rsp[2] = IPMI_CC_CANNOT_RETURN_REQ_NUM_BYTES;
>> +    if ((cmd[7] + rsp->len) > rsp->max_len) {
>> +        rsp->buffer[2] = IPMI_CC_CANNOT_RETURN_REQ_NUM_BYTES;
>>          return;
>>      }
>> -    memcpy(rsp + *rsp_len, ibs->sdr.sdr + pos + cmd[6], cmd[7]);
>> -    *rsp_len += cmd[7];
>> +
>> +    rsp_buffer_pushmore(rsp, ibs->sdr.sdr + pos + cmd[6], cmd[7]);
>>  }
>>  
>>  static void add_sdr(IPMIBmcSim *ibs,
>>                      uint8_t *cmd, unsigned int cmd_len,
>> -                    uint8_t *rsp, unsigned int *rsp_len,
>> -                    unsigned int max_rsp_len)
>> +                    struct rsp_buffer *rsp)
>>  {
>>      uint16_t recid;
>>      struct ipmi_sdr_header *sdrh = (struct ipmi_sdr_header *) cmd + 2;
>>  
>>      if (sdr_add_entry(ibs, sdrh, cmd_len - 2, &recid)) {
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>          return;
>>      }
>> -    IPMI_ADD_RSP_DATA(recid & 0xff);
>> -    IPMI_ADD_RSP_DATA((recid >> 8) & 0xff);
>> +    rsp_buffer_push(rsp, recid & 0xff);
>> +    rsp_buffer_push(rsp, (recid >> 8) & 0xff);
>>  }
>>  
>>  static void clear_sdr_rep(IPMIBmcSim *ibs,
>>                            uint8_t *cmd, unsigned int cmd_len,
>> -                          uint8_t *rsp, unsigned int *rsp_len,
>> -                          unsigned int max_rsp_len)
>> +                          struct rsp_buffer *rsp)
>>  {
>>      IPMI_CHECK_RESERVATION(2, ibs->sdr.reservation);
>>      if (cmd[4] != 'C' || cmd[5] != 'L' || cmd[6] != 'R') {
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>          return;
>>      }
>>      if (cmd[7] == 0xaa) {
>>          ibs->sdr.next_free = 0;
>>          ibs->sdr.overflow = 0;
>>          set_timestamp(ibs, ibs->sdr.last_clear);
>> -        IPMI_ADD_RSP_DATA(1); /* Erasure complete */
>> +        rsp_buffer_push(rsp, 1); /* Erasure complete */
>>          sdr_inc_reservation(&ibs->sdr);
>>      } else if (cmd[7] == 0) {
>> -        IPMI_ADD_RSP_DATA(1); /* Erasure complete */
>> +        rsp_buffer_push(rsp, 1); /* Erasure complete */
>>      } else {
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>          return;
>>      }
>>  }
>>  
>>  static void get_sel_info(IPMIBmcSim *ibs,
>>                           uint8_t *cmd, unsigned int cmd_len,
>> -                         uint8_t *rsp, unsigned int *rsp_len,
>> -                         unsigned int max_rsp_len)
>> +                         struct rsp_buffer *rsp)
>>  {
>>      unsigned int i, val;
>>  
>> -    IPMI_ADD_RSP_DATA(0x51); /* Conform to IPMI 1.5 */
>> -    IPMI_ADD_RSP_DATA(ibs->sel.next_free & 0xff);
>> -    IPMI_ADD_RSP_DATA((ibs->sel.next_free >> 8) & 0xff);
>> +    rsp_buffer_push(rsp, 0x51); /* Conform to IPMI 1.5 */
>> +    rsp_buffer_push(rsp, ibs->sel.next_free & 0xff);
>> +    rsp_buffer_push(rsp, (ibs->sel.next_free >> 8) & 0xff);
>>      val = (MAX_SEL_SIZE - ibs->sel.next_free) * 16;
>> -    IPMI_ADD_RSP_DATA(val & 0xff);
>> -    IPMI_ADD_RSP_DATA((val >> 8) & 0xff);
>> +    rsp_buffer_push(rsp, val & 0xff);
>> +    rsp_buffer_push(rsp, (val >> 8) & 0xff);
>>      for (i = 0; i < 4; i++) {
>> -        IPMI_ADD_RSP_DATA(ibs->sel.last_addition[i]);
>> +        rsp_buffer_push(rsp, ibs->sel.last_addition[i]);
>>      }
>>      for (i = 0; i < 4; i++) {
>> -        IPMI_ADD_RSP_DATA(ibs->sel.last_clear[i]);
>> +        rsp_buffer_push(rsp, ibs->sel.last_clear[i]);
>>      }
>>      /* Only support Reserve SEL */
>> -    IPMI_ADD_RSP_DATA((ibs->sel.overflow << 7) | 0x02);
>> +    rsp_buffer_push(rsp, (ibs->sel.overflow << 7) | 0x02);
>>  }
>>  
>>  static void reserve_sel(IPMIBmcSim *ibs,
>>                          uint8_t *cmd, unsigned int cmd_len,
>> -                        uint8_t *rsp, unsigned int *rsp_len,
>> -                        unsigned int max_rsp_len)
>> +                        struct rsp_buffer *rsp)
>>  {
>> -    IPMI_ADD_RSP_DATA(ibs->sel.reservation & 0xff);
>> -    IPMI_ADD_RSP_DATA((ibs->sel.reservation >> 8) & 0xff);
>> +    rsp_buffer_push(rsp, ibs->sel.reservation & 0xff);
>> +    rsp_buffer_push(rsp, (ibs->sel.reservation >> 8) & 0xff);
>>  }
>>  
>>  static void get_sel_entry(IPMIBmcSim *ibs,
>>                            uint8_t *cmd, unsigned int cmd_len,
>> -                          uint8_t *rsp, unsigned int *rsp_len,
>> -                          unsigned int max_rsp_len)
>> +                          struct rsp_buffer *rsp)
>>  {
>>      unsigned int val;
>>  
>> @@ -1332,17 +1319,17 @@ static void get_sel_entry(IPMIBmcSim *ibs,
>>          IPMI_CHECK_RESERVATION(2, ibs->sel.reservation);
>>      }
>>      if (ibs->sel.next_free == 0) {
>> -        rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>> +        rsp->buffer[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>>          return;
>>      }
>>      if (cmd[6] > 15) {
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>          return;
>>      }
>>      if (cmd[7] == 0xff) {
>>          cmd[7] = 16;
>>      } else if ((cmd[7] + cmd[6]) > 16) {
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>          return;
>>      } else {
>>          cmd[7] += cmd[6];
>> @@ -1352,79 +1339,75 @@ static void get_sel_entry(IPMIBmcSim *ibs,
>>      if (val == 0xffff) {
>>          val = ibs->sel.next_free - 1;
>>      } else if (val >= ibs->sel.next_free) {
>> -        rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>> +        rsp->buffer[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>>          return;
>>      }
>>      if ((val + 1) == ibs->sel.next_free) {
>> -        IPMI_ADD_RSP_DATA(0xff);
>> -        IPMI_ADD_RSP_DATA(0xff);
>> +        rsp_buffer_push(rsp, 0xff);
>> +        rsp_buffer_push(rsp, 0xff);
>>      } else {
>> -        IPMI_ADD_RSP_DATA((val + 1) & 0xff);
>> -        IPMI_ADD_RSP_DATA(((val + 1) >> 8) & 0xff);
>> +        rsp_buffer_push(rsp, (val + 1) & 0xff);
>> +        rsp_buffer_push(rsp, ((val + 1) >> 8) & 0xff);
>>      }
>>      for (; cmd[6] < cmd[7]; cmd[6]++) {
>> -        IPMI_ADD_RSP_DATA(ibs->sel.sel[val][cmd[6]]);
>> +        rsp_buffer_push(rsp, ibs->sel.sel[val][cmd[6]]);
>>      }
>>  }
>>  
>>  static void add_sel_entry(IPMIBmcSim *ibs,
>>                            uint8_t *cmd, unsigned int cmd_len,
>> -                          uint8_t *rsp, unsigned int *rsp_len,
>> -                          unsigned int max_rsp_len)
>> +                          struct rsp_buffer *rsp)
>>  {
>>      if (sel_add_event(ibs, cmd + 2)) {
>> -        rsp[2] = IPMI_CC_OUT_OF_SPACE;
>> +        rsp->buffer[2] = IPMI_CC_OUT_OF_SPACE;
>>          return;
>>      }
>>      /* sel_add_event fills in the record number. */
>> -    IPMI_ADD_RSP_DATA(cmd[2]);
>> -    IPMI_ADD_RSP_DATA(cmd[3]);
>> +    rsp_buffer_push(rsp, cmd[2]);
>> +    rsp_buffer_push(rsp, cmd[3]);
>>  }
>>  
>>  static void clear_sel(IPMIBmcSim *ibs,
>>                        uint8_t *cmd, unsigned int cmd_len,
>> -                      uint8_t *rsp, unsigned int *rsp_len,
>> -                      unsigned int max_rsp_len)
>> +                      struct rsp_buffer *rsp)
>>  {
>>      IPMI_CHECK_RESERVATION(2, ibs->sel.reservation);
>>      if (cmd[4] != 'C' || cmd[5] != 'L' || cmd[6] != 'R') {
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>          return;
>>      }
>>      if (cmd[7] == 0xaa) {
>>          ibs->sel.next_free = 0;
>>          ibs->sel.overflow = 0;
>>          set_timestamp(ibs, ibs->sdr.last_clear);
>> -        IPMI_ADD_RSP_DATA(1); /* Erasure complete */
>> +        rsp_buffer_push(rsp, 1); /* Erasure complete */
>>          sel_inc_reservation(&ibs->sel);
>>      } else if (cmd[7] == 0) {
>> -        IPMI_ADD_RSP_DATA(1); /* Erasure complete */
>> +        rsp_buffer_push(rsp, 1); /* Erasure complete */
>>      } else {
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>          return;
>>      }
>>  }
>>  
>>  static void get_sel_time(IPMIBmcSim *ibs,
>>                           uint8_t *cmd, unsigned int cmd_len,
>> -                         uint8_t *rsp, unsigned int *rsp_len,
>> -                         unsigned int max_rsp_len)
>> +                         struct rsp_buffer *rsp)
>>  {
>>      uint32_t val;
>>      struct ipmi_time now;
>>  
>>      ipmi_gettime(&now);
>>      val = now.tv_sec + ibs->sel.time_offset;
>> -    IPMI_ADD_RSP_DATA(val & 0xff);
>> -    IPMI_ADD_RSP_DATA((val >> 8) & 0xff);
>> -    IPMI_ADD_RSP_DATA((val >> 16) & 0xff);
>> -    IPMI_ADD_RSP_DATA((val >> 24) & 0xff);
>> +    rsp_buffer_push(rsp, val & 0xff);
>> +    rsp_buffer_push(rsp, (val >> 8) & 0xff);
>> +    rsp_buffer_push(rsp, (val >> 16) & 0xff);
>> +    rsp_buffer_push(rsp, (val >> 24) & 0xff);
>>  }
>>  
>>  static void set_sel_time(IPMIBmcSim *ibs,
>>                           uint8_t *cmd, unsigned int cmd_len,
>> -                         uint8_t *rsp, unsigned int *rsp_len,
>> -                         unsigned int max_rsp_len)
>> +                         struct rsp_buffer *rsp)
>>  {
>>      uint32_t val;
>>      struct ipmi_time now;
>> @@ -1436,14 +1419,13 @@ static void set_sel_time(IPMIBmcSim *ibs,
>>  
>>  static void set_sensor_evt_enable(IPMIBmcSim *ibs,
>>                                    uint8_t *cmd, unsigned int cmd_len,
>> -                                  uint8_t *rsp, unsigned int *rsp_len,
>> -                                  unsigned int max_rsp_len)
>> +                                  struct rsp_buffer *rsp)
>>  {
>>      IPMISensor *sens;
>>  
>>      if ((cmd[2] >= MAX_SENSORS) ||
>>              !IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
>> -        rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>> +        rsp->buffer[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>>          return;
>>      }
>>      sens = ibs->sensors + cmd[2];
>> @@ -1479,7 +1461,7 @@ static void set_sensor_evt_enable(IPMIBmcSim *ibs,
>>          }
>>          break;
>>      case 3:
>> -        rsp[2] = IPMI_CC_INVALID_DATA_FIELD;
>> +        rsp->buffer[2] = IPMI_CC_INVALID_DATA_FIELD;
>>          return;
>>      }
>>      IPMI_SENSOR_SET_RET_STATUS(sens, cmd[3]);
>> @@ -1487,34 +1469,32 @@ static void set_sensor_evt_enable(IPMIBmcSim *ibs,
>>  
>>  static void get_sensor_evt_enable(IPMIBmcSim *ibs,
>>                                    uint8_t *cmd, unsigned int cmd_len,
>> -                                  uint8_t *rsp, unsigned int *rsp_len,
>> -                                  unsigned int max_rsp_len)
>> +                                  struct rsp_buffer *rsp)
>>  {
>>      IPMISensor *sens;
>>  
>>      if ((cmd[2] >= MAX_SENSORS) ||
>>          !IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
>> -        rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>> +        rsp->buffer[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>>          return;
>>      }
>>      sens = ibs->sensors + cmd[2];
>> -    IPMI_ADD_RSP_DATA(IPMI_SENSOR_GET_RET_STATUS(sens));
>> -    IPMI_ADD_RSP_DATA(sens->assert_enable & 0xff);
>> -    IPMI_ADD_RSP_DATA((sens->assert_enable >> 8) & 0xff);
>> -    IPMI_ADD_RSP_DATA(sens->deassert_enable & 0xff);
>> -    IPMI_ADD_RSP_DATA((sens->deassert_enable >> 8) & 0xff);
>> +    rsp_buffer_push(rsp, IPMI_SENSOR_GET_RET_STATUS(sens));
>> +    rsp_buffer_push(rsp, sens->assert_enable & 0xff);
>> +    rsp_buffer_push(rsp, (sens->assert_enable >> 8) & 0xff);
>> +    rsp_buffer_push(rsp, sens->deassert_enable & 0xff);
>> +    rsp_buffer_push(rsp, (sens->deassert_enable >> 8) & 0xff);
>>  }
>>  
>>  static void rearm_sensor_evts(IPMIBmcSim *ibs,
>>                                uint8_t *cmd, unsigned int cmd_len,
>> -                              uint8_t *rsp, unsigned int *rsp_len,
>> -                              unsigned int max_rsp_len)
>> +                              struct rsp_buffer *rsp)
>>  {
>>      IPMISensor *sens;
>>  
>>      if ((cmd[2] >= MAX_SENSORS) ||
>>          !IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
>> -        rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>> +        rsp->buffer[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>>          return;
>>      }
>>      sens = ibs->sensors + cmd[2];
>> @@ -1528,57 +1508,54 @@ static void rearm_sensor_evts(IPMIBmcSim *ibs,
>>  
>>  static void get_sensor_evt_status(IPMIBmcSim *ibs,
>>                                    uint8_t *cmd, unsigned int cmd_len,
>> -                                  uint8_t *rsp, unsigned int *rsp_len,
>> -                                  unsigned int max_rsp_len)
>> +                                  struct rsp_buffer *rsp)
>>  {
>>      IPMISensor *sens;
>>  
>>      if ((cmd[2] >= MAX_SENSORS) ||
>>          !IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
>> -        rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>> +        rsp->buffer[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>>          return;
>>      }
>>      sens = ibs->sensors + cmd[2];
>> -    IPMI_ADD_RSP_DATA(sens->reading);
>> -    IPMI_ADD_RSP_DATA(IPMI_SENSOR_GET_RET_STATUS(sens));
>> -    IPMI_ADD_RSP_DATA(sens->assert_states & 0xff);
>> -    IPMI_ADD_RSP_DATA((sens->assert_states >> 8) & 0xff);
>> -    IPMI_ADD_RSP_DATA(sens->deassert_states & 0xff);
>> -    IPMI_ADD_RSP_DATA((sens->deassert_states >> 8) & 0xff);
>> +    rsp_buffer_push(rsp, sens->reading);
>> +    rsp_buffer_push(rsp, IPMI_SENSOR_GET_RET_STATUS(sens));
>> +    rsp_buffer_push(rsp, sens->assert_states & 0xff);
>> +    rsp_buffer_push(rsp, (sens->assert_states >> 8) & 0xff);
>> +    rsp_buffer_push(rsp, sens->deassert_states & 0xff);
>> +    rsp_buffer_push(rsp, (sens->deassert_states >> 8) & 0xff);
>>  }
>>  
>>  static void get_sensor_reading(IPMIBmcSim *ibs,
>>                                 uint8_t *cmd, unsigned int cmd_len,
>> -                               uint8_t *rsp, unsigned int *rsp_len,
>> -                               unsigned int max_rsp_len)
>> +                               struct rsp_buffer *rsp)
>>  {
>>      IPMISensor *sens;
>>  
>>      if ((cmd[2] >= MAX_SENSORS) ||
>>              !IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
>> -        rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>> +        rsp->buffer[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>>          return;
>>      }
>>      sens = ibs->sensors + cmd[2];
>> -    IPMI_ADD_RSP_DATA(sens->reading);
>> -    IPMI_ADD_RSP_DATA(IPMI_SENSOR_GET_RET_STATUS(sens));
>> -    IPMI_ADD_RSP_DATA(sens->states & 0xff);
>> +    rsp_buffer_push(rsp, sens->reading);
>> +    rsp_buffer_push(rsp, IPMI_SENSOR_GET_RET_STATUS(sens));
>> +    rsp_buffer_push(rsp, sens->states & 0xff);
>>      if (IPMI_SENSOR_IS_DISCRETE(sens)) {
>> -        IPMI_ADD_RSP_DATA((sens->states >> 8) & 0xff);
>> +        rsp_buffer_push(rsp, (sens->states >> 8) & 0xff);
>>      }
>>  }
>>  
>>  static void set_sensor_type(IPMIBmcSim *ibs,
>> -                               uint8_t *cmd, unsigned int cmd_len,
>> -                               uint8_t *rsp, unsigned int *rsp_len,
>> -                               unsigned int max_rsp_len)
>> +                            uint8_t *cmd, unsigned int cmd_len,
>> +                            struct rsp_buffer *rsp)
>>  {
>>      IPMISensor *sens;
>>  
>>  
>>      if ((cmd[2] >= MAX_SENSORS) ||
>>              !IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
>> -        rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>> +        rsp->buffer[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>>          return;
>>      }
>>      sens = ibs->sensors + cmd[2];
>> @@ -1587,21 +1564,20 @@ static void set_sensor_type(IPMIBmcSim *ibs,
>>  }
>>  
>>  static void get_sensor_type(IPMIBmcSim *ibs,
>> -                               uint8_t *cmd, unsigned int cmd_len,
>> -                               uint8_t *rsp, unsigned int *rsp_len,
>> -                               unsigned int max_rsp_len)
>> +                            uint8_t *cmd, unsigned int cmd_len,
>> +                            struct rsp_buffer *rsp)
>>  {
>>      IPMISensor *sens;
>>  
>>  
>>      if ((cmd[2] >= MAX_SENSORS) ||
>>              !IPMI_SENSOR_GET_PRESENT(ibs->sensors + cmd[2])) {
>> -        rsp[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>> +        rsp->buffer[2] = IPMI_CC_REQ_ENTRY_NOT_PRESENT;
>>          return;
>>      }
>>      sens = ibs->sensors + cmd[2];
>> -    IPMI_ADD_RSP_DATA(sens->sensor_type);
>> -    IPMI_ADD_RSP_DATA(sens->evt_reading_type_code);
>> +    rsp_buffer_push(rsp, sens->sensor_type);
>> +    rsp_buffer_push(rsp, sens->evt_reading_type_code);
>>  }
>>  
>>  
>> -- 
>> 2.1.4
> 
> 




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