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


From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [PATCH v2 02/10] ipmi: replace IPMI_ADD_RSP_DATA() macro with inline helpers
Date: Wed, 2 Mar 2016 12:25:03 +0200

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;

  
>  #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 { };

>  
>  /* 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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