usr/src/lib/sun_fc/common/Sun_fcScsiReadCapacityV2.cc

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26
  27
  28 #include "Trace.h"
  29 #include "HBA.h"
  30 #include "HBAPort.h"
  31 #include "Exceptions.h"
  32 #include "sun_fc.h"
  33 #include <unistd.h>
  34
  35 #define     BUSY_SLEEP          1000 /* 1/100 second */
  36 #define     BUSY_RETRY_TIMER    5000000000ULL /* Retry for 5 seconds */
  37 #ifdef  __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 /**
  42  * @memo            Send a read capacity to a remote WWN
  43  * @return          HBA_STATUS_OK or other error code
  44  *                  scsiStatus should be checked to ensure SCSI command
  45  *                  was a success.
  46  * @param           handle The HBA to operate on
  47  * @param           portWWN Indicates the HBA port to send command through
  48  * @param           targetPortWWN Indicates the target to send command to
  49  * @param           fcLun Indicates the target unit to send command to
  50  * @param           responseBuffer User-allocated response buffer
  51  * @param           responseSize Size of User-allocated response buffer
  52  * @param           scsiStatus User-allocated scsi status byte
  53  *
  54  * @doc             This routine will attempt a limited number of retries
  55  *                  When busy or again errors are encountered.
  56  */
  57 HBA_STATUS
  58 Sun_fcScsiReadCapacityV2(HBA_HANDLE handle, HBA_WWN portWWN,
  59             HBA_WWN targetPortWWN, HBA_UINT64 fcLun,
  60             void *responseBuffer, HBA_UINT32 *responseSize,
  61             HBA_UINT8 *scsiStatus,
  62             void *senseBuffer, HBA_UINT32 *senseSize) {
  63         Trace log("Sun_fcScsiReadCapacityV2");
  64
  65         hrtime_t start = gethrtime();
  66         hrtime_t end = start + BUSY_RETRY_TIMER;
  67         for (hrtime_t cur = start; cur < end; cur = gethrtime()) {
  68             try {
  69                 Handle *myHandle = Handle::findHandle(handle);
  70                 HBA *hba = myHandle->getHBA();
  71                 HBAPort *port = hba->getPort(wwnConversion(portWWN.wwn));
  72                 port->sendReadCapacity(wwnConversion(targetPortWWN.wwn),
  73                         fcLun, responseBuffer, responseSize, scsiStatus,
  74                         senseBuffer, senseSize);
  75                 return (HBA_STATUS_OK);
  76             } catch (BusyException &e) {
  77                 usleep(BUSY_SLEEP);
  78                 continue;
  79             } catch (TryAgainException &e) {
  80                 usleep(BUSY_SLEEP);
  81                 continue;
  82             } catch (HBAException &e) {
  83                 return (e.getErrorCode());
  84             } catch (...) {
  85                 log.internalError(
  86                     "Uncaught exception");
  87                 return (HBA_STATUS_ERROR);
  88             }
  89         }
  90 }
  91 #ifdef  __cplusplus
  92 }
  93 #endif