4780 comstar iSCSI target shouldn't abuse ddi_get_time(9f)
Reviewed by: Eric Diven <eric.diven@delphix.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>

*** 19,29 ****
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
   *
!  * Copyright 2013 Nexenta Systems, Inc. All rights reserved.
   */
  
  #include <sys/cpuvar.h>
  #include <sys/types.h>
  #include <sys/conf.h>
--- 19,29 ----
   * CDDL HEADER END
   */
  /*
   * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
   *
!  * Copyright 2014 Nexenta Systems, Inc. All rights reserved.
   */
  
  #include <sys/cpuvar.h>
  #include <sys/types.h>
  #include <sys/conf.h>
*** 3123,3133 ****
                   * the missing command is delivered to the SCSI layer.
                   * Irrespective of the order of insertion into the
                   * staging queue, the commands are processed out of the
                   * queue in cmdSN order only.
                   */
!                 rx_pdu->isp_queue_time = ddi_get_time();
                  iscsit_add_pdu_to_queue(ist, rx_pdu);
                  mutex_exit(&ist->ist_sn_mutex);
                  return (ISCSIT_CMDSN_GT_EXPCMDSN);
          } else if (iscsit_sna_lt(ntohl(hdr->cmdsn), ist->ist_expcmdsn)) {
                  DTRACE_PROBE3(cmdsn__lt__expcmdsn, iscsit_sess_t *, ist,
--- 3123,3133 ----
                   * the missing command is delivered to the SCSI layer.
                   * Irrespective of the order of insertion into the
                   * staging queue, the commands are processed out of the
                   * queue in cmdSN order only.
                   */
!                 rx_pdu->isp_queue_time = gethrtime();
                  iscsit_add_pdu_to_queue(ist, rx_pdu);
                  mutex_exit(&ist->ist_sn_mutex);
                  return (ISCSIT_CMDSN_GT_EXPCMDSN);
          } else if (iscsit_sna_lt(ntohl(hdr->cmdsn), ist->ist_expcmdsn)) {
                  DTRACE_PROBE3(cmdsn__lt__expcmdsn, iscsit_sess_t *, ist,
*** 3393,3404 ****
                          /*
                           * If the PDU wait time has not exceeded threshold
                           * stop scanning the staging queue until the timer
                           * fires again
                           */
!                         if ((ddi_get_time() - next_pdu->isp_queue_time)
!                             < rxpdu_queue_threshold) {
                                  mutex_exit(&ist->ist_sn_mutex);
                                  return;
                          }
                          /*
                           * Remove the next PDU from the queue and post it
--- 3393,3404 ----
                          /*
                           * If the PDU wait time has not exceeded threshold
                           * stop scanning the staging queue until the timer
                           * fires again
                           */
!                         if ((gethrtime() - next_pdu->isp_queue_time)
!                             < (rxpdu_queue_threshold * NANOSEC)) {
                                  mutex_exit(&ist->ist_sn_mutex);
                                  return;
                          }
                          /*
                           * Remove the next PDU from the queue and post it