xref: /freebsd-10.2-release/sys/dev/isci/scil/scic_sds_smp_request.c

/*-
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 * The full GNU General Public License is included in this distribution
 * in the file called LICENSE.GPL.
 *
 * BSD LICENSE
 *
 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <dev/isci/scil/scic_sds_smp_request.h>
#include <dev/isci/scil/scic_sds_logger.h>
#include <dev/isci/scil/scic_sds_controller.h>
#include <dev/isci/scil/scic_sds_remote_device.h>
#include <dev/isci/scil/scic_remote_device.h>
#include <dev/isci/scil/sci_util.h>
#include <dev/isci/sci_environment.h>
#include <dev/isci/scil/intel_sas.h>
#include <dev/isci/scil/scic_sds_request.h>
#include <dev/isci/scil/scic_controller.h>
#include <dev/isci/scil/scu_completion_codes.h>
#include <dev/isci/scil/scu_task_context.h>
#include <dev/isci/scil/sci_base_state_machine.h>

/**
 * This method return the memory space required for STP PIO requests.
 *
 * @return U32
 */
U32 scic_sds_smp_request_get_object_size(void)
{
   return   sizeof(SCIC_SDS_REQUEST_T)
          + sizeof(SMP_REQUEST_T)
          + sizeof(U32)
          + sizeof(SMP_RESPONSE_T)
          + sizeof(U32)
          + sizeof(SCU_TASK_CONTEXT_T)
          + CACHE_LINE_SIZE;
}

/**
 * This macro returns the address of the smp command buffer in the smp request
 * memory. No need to cast to SMP request type.
 */
#define scic_sds_smp_request_get_command_buffer_unaligned(memory) \
   ( ((char *)(memory)) + sizeof(SCIC_SDS_REQUEST_T) )

/**
 * This macro aligns the smp command buffer in DWORD alignment
*/
#define scic_sds_smp_request_align_command_buffer(address) \
   ((char *)( \
      (((POINTER_UINT)(address)) + (sizeof(U32) - 1)) \
         & ~(sizeof(U32)- 1) \
   ))

/**
 * This macro returns the DWORD-aligned smp command buffer
*/
#define scic_sds_smp_request_get_command_buffer(memory) \
   ((char *)  \
      ((char *)scic_sds_smp_request_align_command_buffer( \
         (char *) scic_sds_smp_request_get_command_buffer_unaligned(memory) \
   )))

/**
 * This macro returns the address of the smp response buffer in the smp request
 * memory.
 */
#define scic_sds_smp_request_get_response_buffer_unaligned(memory) \
   ( ((char *)(scic_sds_smp_request_get_command_buffer(memory))) \
      + sizeof(SMP_REQUEST_T) )

/**
 * This macro aligns the smp command buffer in DWORD alignment
*/
#define scic_sds_smp_request_align_response_buffer(address) \
   ((char *)( \
      (((POINTER_UINT)(address)) + (sizeof(U32) - 1)) \
         & ~(sizeof(U32)- 1) \
   ))

/**
 * This macro returns the DWORD-aligned smp resposne buffer
*/
#define scic_sds_smp_request_get_response_buffer(memory) \
   ((char *)  \
      ((char *)scic_sds_smp_request_align_response_buffer( \
         (char *) scic_sds_smp_request_get_response_buffer_unaligned(memory) \
   )))

/**
 * This macro returs the task context buffer for the SMP request.
 */
#define scic_sds_smp_request_get_task_context_buffer_unaligned(memory) \
   ((SCU_TASK_CONTEXT_T *)( \
        ((char *)(scic_sds_smp_request_get_response_buffer(memory))) \
      + sizeof(SMP_RESPONSE_T) \
   ))

/**
 * This macro returns the dword-aligned smp task context buffer
 */
#define scic_sds_smp_request_get_task_context_buffer(memory) \
   ((SCU_TASK_CONTEXT_T *)( \
      ((char *)scic_sds_request_align_task_context_buffer( \
         (char *)scic_sds_smp_request_get_task_context_buffer_unaligned(memory)) \
   )))

/**
 * @brief This method build the remainder of the IO request object.
 *
 * @pre The scic_sds_general_request_construct() must be called before this
 *      call is valid.
 *
 * @param[in] this_request This parameter specifies the request object being
 *            constructed.
 *
 * @return none
 */

void scic_sds_smp_request_assign_buffers(
   SCIC_SDS_REQUEST_T *this_request
)
{
   // Assign all of the buffer pointers
   this_request->command_buffer =
      scic_sds_smp_request_get_command_buffer(this_request);
   this_request->response_buffer =
      scic_sds_smp_request_get_response_buffer(this_request);
   this_request->sgl_element_pair_buffer = NULL;

   if (this_request->was_tag_assigned_by_user == FALSE)
   {
      this_request->task_context_buffer =
         scic_sds_smp_request_get_task_context_buffer(this_request);
   }

}
/**
 * @brief This method is called by the SCI user to build an SMP
 *        IO request.
 *
 * @pre
 *        - The user must have previously called scic_io_request_construct()
 *          on the supplied IO request.
 *
 * @param[in]  scic_io_request This parameter specifies the handle to the
 *             io request object to be built.
 *
 * @return Indicate if the controller successfully built the IO request.
 * @retval SCI_SUCCESS This value is returned if the IO request was
 *         successfully built.
 * @retval SCI_FAILURE_UNSUPPORTED_PROTOCOL This value is returned if the
 *         remote_device does not support the SMP protocol.
 * @retval SCI_FAILURE_INVALID_ASSOCIATION This value is returned if the
 *         user did not properly set the association between the SCIC IO
 *         request and the user's IO request.  Please refer to the
 *         sci_object_set_association() routine for more
 *         information.
 */
SCI_STATUS scic_io_request_construct_smp(
   SCI_IO_REQUEST_HANDLE_T  scic_smp_request
)
{
   SMP_REQUEST_T smp_request;

   SCIC_SDS_REQUEST_T *this_request = (SCIC_SDS_REQUEST_T *) scic_smp_request;
   SCIC_LOG_TRACE((
      sci_base_object_get_logger(this_request),
      SCIC_LOG_OBJECT_SMP_IO_REQUEST,
      "scic_io_request_construct_smp(0x%x) enter\n",
      this_request
   ));

   this_request->protocol                     = SCIC_SMP_PROTOCOL;
   this_request->has_started_substate_machine = TRUE;

   // Construct the started sub-state machine.
   sci_base_state_machine_construct(
      &this_request->started_substate_machine,
      &this_request->parent.parent,
      scic_sds_smp_request_started_substate_table,
      SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE
   );

   // Construct the SMP SCU Task Context
   memcpy((char *)&smp_request,
        this_request->command_buffer,
        sizeof(SMP_REQUEST_T));

   // Look at the SMP requests' header fields; for certain SAS 1.x SMP
   // functions under SAS 2.0, a zero request length really indicates
   // a non-zero default length.
   if( smp_request.header.request_length == 0 )
   {
       switch( smp_request.header.function )
       {
       case SMP_FUNCTION_DISCOVER:
       case SMP_FUNCTION_REPORT_PHY_ERROR_LOG:
       case SMP_FUNCTION_REPORT_PHY_SATA:
       case SMP_FUNCTION_REPORT_ROUTE_INFORMATION:
           smp_request.header.request_length = 2;
           break;
       case SMP_FUNCTION_CONFIGURE_ROUTE_INFORMATION:
       case SMP_FUNCTION_PHY_CONTROL:
       case SMP_FUNCTION_PHY_TEST:
           smp_request.header.request_length = 9;
           break;
       // Default - zero is a valid default for 2.0.
       }
   }

   scu_smp_request_construct_task_context(
      this_request,
      &smp_request
   );

   sci_base_state_machine_change_state(
      &this_request->parent.state_machine,
      SCI_BASE_REQUEST_STATE_CONSTRUCTED
   );

   return SCI_SUCCESS;
}

/**
 * @brief This method is called by the SCI user to build an SMP pass-through
 *        IO request.
 *
 * @pre
 *        - The user must have previously called scic_io_request_construct()
 *          on the supplied IO request.
 *
 * @param[in]  scic_smp_request This parameter specifies the handle to the
 *             io request object to be built.
 *
 * @param[in]  passthru_cb This parameter specifies the pointer to the callback
 *             structure that contains the function pointers
 *
 * @return Indicate if the controller successfully built the IO request.
 */
SCI_STATUS scic_io_request_construct_smp_pass_through(
   SCI_IO_REQUEST_HANDLE_T  scic_smp_request,
   SCIC_SMP_PASSTHRU_REQUEST_CALLBACKS_T *passthru_cb
)
{
   SMP_REQUEST_T smp_request;
   U8 * request_buffer;
   U32 request_buffer_length_in_bytes;

   SCIC_SDS_REQUEST_T *this_request = (SCIC_SDS_REQUEST_T *) scic_smp_request;
   SCIC_LOG_TRACE((
      sci_base_object_get_logger(this_request),
      SCIC_LOG_OBJECT_SMP_IO_REQUEST,
      "scic_io_request_construct_smp_pass_through(0x%x) enter\n",
      this_request
   ));

   this_request->protocol                     = SCIC_SMP_PROTOCOL;
   this_request->has_started_substate_machine = TRUE;

   // Call the callback function to retrieve the SMP passthrough request
   request_buffer_length_in_bytes = passthru_cb->scic_cb_smp_passthru_get_request (
                                       (void *)this_request,
                                       &request_buffer
                                    );

   //copy the request to smp request
   memcpy((char *)&smp_request.request.vendor_specific_request,
        request_buffer,
        request_buffer_length_in_bytes);

   //the header length in smp_request is in dwords - the sas spec has similar way,
   //but the csmi header contains the number of bytes, so we need to convert the
   //number of bytes to number of dwords
   smp_request.header.request_length = (U8) (request_buffer_length_in_bytes / sizeof (U32));

   //Grab the other needed fields from the smp request using callbacks
   smp_request.header.smp_frame_type = passthru_cb->scic_cb_smp_passthru_get_frame_type ((void *)this_request);
   smp_request.header.function = passthru_cb->scic_cb_smp_passthru_get_function ((void *)this_request);
   smp_request.header.allocated_response_length = passthru_cb->scic_cb_smp_passthru_get_allocated_response_length((void *)this_request);

   // Construct the started sub-state machine.
   sci_base_state_machine_construct(
      &this_request->started_substate_machine,
      &this_request->parent.parent,
      scic_sds_smp_request_started_substate_table,
      SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE
   );

   // Construct the SMP SCU Task Context
   scu_smp_request_construct_task_context (this_request, &smp_request);

   sci_base_state_machine_change_state(
      &this_request->parent.state_machine,
      SCI_BASE_REQUEST_STATE_CONSTRUCTED
   );

   return SCI_SUCCESS;
}

/**
 * @brief This method will fill in the SCU Task Context for a SMP request. The
 *        following important settings are utilized:
 *
 *          -# task_type == SCU_TASK_TYPE_SMP.  This simply indicates
 *             that a normal request type (i.e. non-raw frame) is being
 *             utilized to perform task management.
 *          -# control_frame == 1.  This ensures that the proper endianess
 *             is set so that the bytes are transmitted in the right order
 *             for a smp request frame.
 *
 * @param[in] this_request This parameter specifies the smp request object
 *            being constructed.
 *
 * @return none
 */
void scu_smp_request_construct_task_context(
   SCIC_SDS_REQUEST_T *this_request,
   SMP_REQUEST_T      *smp_request
)
{
   SCI_PHYSICAL_ADDRESS      physical_address;
   SCIC_SDS_CONTROLLER_T    *owning_controller;
   SCIC_SDS_REMOTE_DEVICE_T *target_device;
   SCIC_SDS_PORT_T          *target_port;
   SCU_TASK_CONTEXT_T *task_context;

   //byte swap the smp request.
   scic_word_copy_with_swap(
      this_request->command_buffer,
      (U32*) smp_request,
      sizeof(SMP_REQUEST_T)/sizeof(U32)
   );

   task_context = scic_sds_request_get_task_context(this_request);

   owning_controller = scic_sds_request_get_controller(this_request);
   target_device = scic_sds_request_get_device(this_request);
   target_port = scic_sds_request_get_port(this_request);

   SCIC_LOG_TRACE((
      sci_base_object_get_logger(this_request),
      SCIC_LOG_OBJECT_SMP_IO_REQUEST,
      "scu_smp_request_construct_task_context(0x%x) contents\n"
      "   reqlen=%x; function=%x;\n",
      this_request,
      smp_request->header.request_length,
      smp_request->header.function
   ));

   // Fill in the TC with the its required data
   // 00h
   task_context->priority = 0;
   task_context->initiator_request = 1;
   task_context->connection_rate =
      scic_remote_device_get_connection_rate(target_device);
   task_context->protocol_engine_index =
      scic_sds_controller_get_protocol_engine_group(owning_controller);
   task_context->logical_port_index =
      scic_sds_port_get_index(target_port);
   task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SMP;
   task_context->abort = 0;
   task_context->valid = SCU_TASK_CONTEXT_VALID;
   task_context->context_type = SCU_TASK_CONTEXT_TYPE;

   //04h
   task_context->remote_node_index = this_request->target_device->rnc->remote_node_index;
   task_context->command_code = 0;
   task_context->task_type = SCU_TASK_TYPE_SMP_REQUEST;

   //08h
   task_context->link_layer_control = 0;
   task_context->do_not_dma_ssp_good_response = 1;
   task_context->strict_ordering = 0;
   task_context->control_frame = 1;
   task_context->timeout_enable = 0;
   task_context->block_guard_enable = 0;

   //0ch
   task_context->address_modifier = 0;

   //10h
   task_context->ssp_command_iu_length = smp_request->header.request_length;

   //14h
   task_context->transfer_length_bytes = 0;

   //18h ~ 30h, protocol specific
   // since commandIU has been build by framework at this point, we just
   // copy the frist DWord from command IU to this location.
   memcpy((void *)(&task_context->type.smp), this_request->command_buffer, sizeof(U32) );

   //40h
   // "For SMP you could program it to zero. We would prefer that way so that
   // done code will be consistent." - Venki
   task_context->task_phase = 0;

   if (this_request->was_tag_assigned_by_user)
   {
      // Build the task context now since we have already read the data
      this_request->post_context = (
           SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC
         | (
                scic_sds_controller_get_protocol_engine_group(owning_controller)
             << SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT
           )
         | (
                 scic_sds_port_get_index(target_port)
              << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT
           )
         | scic_sds_io_tag_get_index(this_request->io_tag)
      );
   }
   else
   {
      // Build the task context now since we have already read the data
      this_request->post_context = (
           SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC
         | (
               scic_sds_controller_get_protocol_engine_group(owning_controller)
            << SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT
           )
         | (
                scic_sds_port_get_index(target_port)
             << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT
           )
         // This is not assigned because we have to wait until we get a TCi
      );
   }

   // Copy the physical address for the command buffer to the SCU Task Context
   // command buffer should not contain command header.
   scic_cb_io_request_get_physical_address(
         scic_sds_request_get_controller(this_request),
         this_request,
         ((char *)(this_request->command_buffer) + sizeof(U32)),
         &physical_address
      );

   task_context->command_iu_upper =
      sci_cb_physical_address_upper(physical_address);
   task_context->command_iu_lower =
      sci_cb_physical_address_lower(physical_address);


   //SMP response comes as UF, so no need to set response IU address.
   task_context->response_iu_upper = 0;
   task_context->response_iu_lower = 0;
}

//******************************************************************************
//* SMP REQUEST STATE MACHINE
//******************************************************************************

/**
 * @brief This method processes an unsolicited frame while the SMP request is
 *        waiting for a response frame.  It will copy the response data, release
 *        the unsolicited frame, and transition the request to the
 *        SCI_BASE_REQUEST_STATE_COMPLETED state.
 *
 * @param[in] this_request This parameter specifies the request for which
 *            the unsolicited frame was received.
 * @param[in] frame_index This parameter indicates the unsolicited frame
 *            index that should contain the response.
 *
 * @return This method returns an indication of whether the response
 *         frame was handled successfully or not.
 * @retval SCI_SUCCESS Currently this value is always returned and indicates
 *         successful processing of the TC response.
 */
static
SCI_STATUS scic_sds_smp_request_await_response_frame_handler(
   SCIC_SDS_REQUEST_T * this_request,
   U32                  frame_index
)
{
   SCI_STATUS              status;
   void                  * frame_header;
   SMP_RESPONSE_HEADER_T * this_frame_header;
   U8                    * user_smp_buffer = this_request->response_buffer;

   // Save off the controller, so that we do not touch the request after it
   //  is completed.
   SCIC_SDS_CONTROLLER_T * controller = scic_sds_request_get_controller(this_request);

   SCIC_LOG_TRACE((
      sci_base_object_get_logger(this_request),
      SCIC_LOG_OBJECT_SMP_IO_REQUEST,
      "scic_sds_smp_request_await_response_frame_handler(0x%x, 0x%x) enter\n",
      this_request, frame_index
   ));

   status = scic_sds_unsolicited_frame_control_get_header(
      &(controller->uf_control),
      frame_index,
      &frame_header
   );

   //byte swap the header.
   scic_word_copy_with_swap(
      (U32*) user_smp_buffer,
      frame_header,
      sizeof(SMP_RESPONSE_HEADER_T)/sizeof(U32)
   );
   this_frame_header = (SMP_RESPONSE_HEADER_T*) user_smp_buffer;

   if (this_frame_header->smp_frame_type == SMP_FRAME_TYPE_RESPONSE)
   {
      void * smp_response_buffer;

      status = scic_sds_unsolicited_frame_control_get_buffer(
         &(controller->uf_control),
         frame_index,
         &smp_response_buffer
      );

      scic_word_copy_with_swap(
         (U32*) (user_smp_buffer + sizeof(SMP_RESPONSE_HEADER_T)),
         smp_response_buffer,
         sizeof(SMP_RESPONSE_BODY_T)/sizeof(U32)
      );
      if (this_frame_header->function == SMP_FUNCTION_DISCOVER)
      {
          SMP_RESPONSE_T * this_smp_response;

          this_smp_response = (SMP_RESPONSE_T *)user_smp_buffer;

          // Some expanders only report an attached SATA device, and
          // not an STP target.  Since the core depends on the STP
          // target attribute to correctly build I/O, set the bit now
          // if necessary.
          if (this_smp_response->response.discover.protocols.u.bits.attached_sata_device
           && !this_smp_response->response.discover.protocols.u.bits.attached_stp_target)
          {
              this_smp_response->response.discover.protocols.u.bits.attached_stp_target = 1;

              SCIC_LOG_TRACE((
                  sci_base_object_get_logger(this_request),
                 SCIC_LOG_OBJECT_SMP_IO_REQUEST,
                 "scic_sds_smp_request_await_response_frame_handler(0x%x) Found SATA dev, setting STP bit.\n",
                 this_request
              ));
          }
      }

     //Don't need to copy to user space. User instead will refer to
     //core request's response buffer.

     //copy the smp response to framework smp request's response buffer.
     //scic_sds_smp_request_copy_response(this_request);

      scic_sds_request_set_status(
         this_request, SCU_TASK_DONE_GOOD, SCI_SUCCESS
      );

      sci_base_state_machine_change_state(
         &this_request->started_substate_machine,
         SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION
      );
   }
   else
   {
      // This was not a response frame why did it get forwarded?
      SCIC_LOG_ERROR((
         sci_base_object_get_logger(this_request),
         SCIC_LOG_OBJECT_SMP_IO_REQUEST,
         "SCIC SMP Request 0x%08x received unexpected frame %d type 0x%02x\n",
         this_request, frame_index, this_frame_header->smp_frame_type
      ));

     scic_sds_request_set_status(
        this_request,
        SCU_TASK_DONE_SMP_FRM_TYPE_ERR,
        SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR
     );

     sci_base_state_machine_change_state(
         &this_request->parent.state_machine,
         SCI_BASE_REQUEST_STATE_COMPLETED
      );
   }

   scic_sds_controller_release_frame(
      controller, frame_index
   );

   return SCI_SUCCESS;
}


/**
 * @brief This method processes an abnormal TC completion while the SMP
 *        request is waiting for a response frame.  It decides what
 *        happened to the IO based on TC completion status.
 *
 * @param[in] this_request This parameter specifies the request for which
 *            the TC completion was received.
 * @param[in] completion_code This parameter indicates the completion status
 *            information for the TC.
 *
 * @return Indicate if the tc completion handler was successful.
 * @retval SCI_SUCCESS currently this method always returns success.
 */
static
SCI_STATUS scic_sds_smp_request_await_response_tc_completion_handler(
   SCIC_SDS_REQUEST_T * this_request,
   U32                  completion_code
)
{
   SCIC_LOG_TRACE((
      sci_base_object_get_logger(this_request),
      SCIC_LOG_OBJECT_SMP_IO_REQUEST,
      "scic_sds_smp_request_await_response_tc_completion_handler(0x%x, 0x%x) enter\n",
      this_request, completion_code
   ));

   switch (SCU_GET_COMPLETION_TL_STATUS(completion_code))
   {
   case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
      //In the AWAIT RESPONSE state, any TC completion is unexpected.
      //but if the TC has success status, we complete the IO anyway.
      scic_sds_request_set_status(
         this_request, SCU_TASK_DONE_GOOD, SCI_SUCCESS
      );

      sci_base_state_machine_change_state(
         &this_request->parent.state_machine,
         SCI_BASE_REQUEST_STATE_COMPLETED
      );
   break;

   case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_RESP_TO_ERR):
   case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_UFI_ERR):
   case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_FRM_TYPE_ERR):
   case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_LL_RX_ERR):
      //These status has been seen in a specific LSI expander, which sometimes
      //is not able to send smp response within 2 ms. This causes our hardware
      //break the connection and set TC completion with one of these SMP_XXX_XX_ERR
      //status. For these type of error, we ask scic user to retry the request.
      scic_sds_request_set_status(
         this_request, SCU_TASK_DONE_SMP_RESP_TO_ERR, SCI_FAILURE_RETRY_REQUIRED
      );

      sci_base_state_machine_change_state(
         &this_request->parent.state_machine,
         SCI_BASE_REQUEST_STATE_COMPLETED
      );
   break;

   default:
      // All other completion status cause the IO to be complete.  If a NAK
      // was received, then it is up to the user to retry the request.
      scic_sds_request_set_status(
         this_request,
         SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
         SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR
      );

      sci_base_state_machine_change_state(
         &this_request->parent.state_machine,
         SCI_BASE_REQUEST_STATE_COMPLETED
      );
   break;
   }

   return SCI_SUCCESS;
}


/**
 * @brief This method processes the completions transport layer (TL) status
 *        to determine if the SMP request was sent successfully. If the SMP
 *        request was sent successfully, then the state for the SMP request
 *        transits to waiting for a response frame.
 *
 * @param[in] this_request This parameter specifies the request for which
 *            the TC completion was received.
 * @param[in] completion_code This parameter indicates the completion status
 *            information for the TC.
 *
 * @return Indicate if the tc completion handler was successful.
 * @retval SCI_SUCCESS currently this method always returns success.
 */
static
SCI_STATUS scic_sds_smp_request_await_tc_completion_tc_completion_handler(
   SCIC_SDS_REQUEST_T * this_request,
   U32                  completion_code
)
{
   SCIC_LOG_TRACE((
      sci_base_object_get_logger(this_request),
      SCIC_LOG_OBJECT_SMP_IO_REQUEST,
      "scic_sds_smp_request_await_tc_completion_tc_completion_handler(0x%x, 0x%x) enter\n",
      this_request, completion_code
   ));

   switch (SCU_GET_COMPLETION_TL_STATUS(completion_code))
   {
   case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
      scic_sds_request_set_status(
         this_request, SCU_TASK_DONE_GOOD, SCI_SUCCESS
      );

      sci_base_state_machine_change_state(
         &this_request->parent.state_machine,
         SCI_BASE_REQUEST_STATE_COMPLETED
      );
   break;

   default:
      // All other completion status cause the IO to be complete.  If a NAK
      // was received, then it is up to the user to retry the request.
      scic_sds_request_set_status(
         this_request,
         SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
         SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR
      );

      sci_base_state_machine_change_state(
         &this_request->parent.state_machine,
         SCI_BASE_REQUEST_STATE_COMPLETED
      );
   break;
   }

   return SCI_SUCCESS;
}


SCIC_SDS_IO_REQUEST_STATE_HANDLER_T
scic_sds_smp_request_started_substate_handler_table
[SCIC_SDS_SMP_REQUEST_STARTED_MAX_SUBSTATES] =
{
   // SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE
   {
      {
         scic_sds_request_default_start_handler,
         scic_sds_request_started_state_abort_handler,
         scic_sds_request_default_complete_handler,
         scic_sds_request_default_destruct_handler
      },
      scic_sds_smp_request_await_response_tc_completion_handler,
      scic_sds_request_default_event_handler,
      scic_sds_smp_request_await_response_frame_handler
   },
   // SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION
   {
      {
         scic_sds_request_default_start_handler,
         scic_sds_request_started_state_abort_handler,
         scic_sds_request_default_complete_handler,
         scic_sds_request_default_destruct_handler
      },
      scic_sds_smp_request_await_tc_completion_tc_completion_handler,
      scic_sds_request_default_event_handler,
      scic_sds_request_default_frame_handler
   }
};

/**
 * @brief This method performs the actions required when entering the
 *        SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_RESPONSE sub-state.
 *        This includes setting the IO request state handlers for this
 *        sub-state.
 *
 * @param[in]  object This parameter specifies the request object for which
 *             the sub-state change is occuring.
 *
 * @return none.
 */
static
void scic_sds_smp_request_started_await_response_substate_enter(
   SCI_BASE_OBJECT_T *object
)
{
   SCIC_SDS_REQUEST_T *this_request = (SCIC_SDS_REQUEST_T *)object;

   SET_STATE_HANDLER(
      this_request,
      scic_sds_smp_request_started_substate_handler_table,
      SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE
   );
}

/**
 * @brief This method performs the actions required when entering the
 *        SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION
 *        sub-state.  This includes setting the SMP request state handlers for
 *        this sub-state.
 *
 * @param[in]  object This parameter specifies the request object for which
 *             the sub-state change is occuring.
 *
 * @return none.
 */
static
void scic_sds_smp_request_started_await_tc_completion_substate_enter(
   SCI_BASE_OBJECT_T *object
)
{
   SCIC_SDS_REQUEST_T *this_request = (SCIC_SDS_REQUEST_T *)object;

   SET_STATE_HANDLER(
      this_request,
      scic_sds_smp_request_started_substate_handler_table,
      SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION
   );
}

SCI_BASE_STATE_T scic_sds_smp_request_started_substate_table
[SCIC_SDS_SMP_REQUEST_STARTED_MAX_SUBSTATES] =
{
   {
      SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE,
      scic_sds_smp_request_started_await_response_substate_enter,
      NULL
   },
   {
      SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION,
      scic_sds_smp_request_started_await_tc_completion_substate_enter,
      NULL
   }
};