include/scsi/scsi_bsg_iscsi.h

   1 /*
   2  *  iSCSI Transport BSG Interface
   3  *
   4  *  Copyright (C) 2009   James Smart, Emulex Corporation
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #ifndef SCSI_BSG_ISCSI_H
  23 #define SCSI_BSG_ISCSI_H
  24
  25 /*
  26  * This file intended to be included by both kernel and user space
  27  */
  28
  29 #include <scsi/scsi.h>
  30
  31 /*
  32  * iSCSI Transport SGIO v4 BSG Message Support
  33  */
  34
  35 /* Default BSG request timeout (in seconds) */
  36 #define ISCSI_DEFAULT_BSG_TIMEOUT      (10 * HZ)
  37
  38
  39 /*
  40  * Request Message Codes supported by the iSCSI Transport
  41  */
  42
  43 /* define the class masks for the message codes */
  44 #define ISCSI_BSG_CLS_MASK     0xF0000000      /* find object class */
  45 #define ISCSI_BSG_HST_MASK     0x80000000      /* iscsi host class */
  46
  47 /* iscsi host Message Codes */
  48 #define ISCSI_BSG_HST_VENDOR           (ISCSI_BSG_HST_MASK | 0x000000FF)
  49
  50
  51 /*
  52  * iSCSI Host Messages
  53  */
  54
  55 /* ISCSI_BSG_HST_VENDOR : */
  56
  57 /* Request:
  58  * Note: When specifying vendor_id, be sure to read the Vendor Type and ID
  59  *   formatting requirements specified in scsi_netlink.h
  60  */
  61 struct iscsi_bsg_host_vendor {
  62         /*
  63          * Identifies the vendor that the message is formatted for. This
  64          * should be the recipient of the message.
  65          */
  66         uint64_t vendor_id;
  67
  68         /* start of vendor command area */
  69         uint32_t vendor_cmd[0];
  70 };
  71
  72 /* Response:
  73  */
  74 struct iscsi_bsg_host_vendor_reply {
  75         /* start of vendor response area */
  76         uint32_t vendor_rsp[0];
  77 };
  78
  79
  80 /* request (CDB) structure of the sg_io_v4 */
  81 struct iscsi_bsg_request {
  82         uint32_t msgcode;
  83         union {
  84                 struct iscsi_bsg_host_vendor    h_vendor;
  85         } rqst_data;
  86 } __attribute__((packed));
  87
  88
  89 /* response (request sense data) structure of the sg_io_v4 */
  90 struct iscsi_bsg_reply {
  91         /*
  92          * The completion result. Result exists in two forms:
  93          * if negative, it is an -Exxx system errno value. There will
  94          * be no further reply information supplied.
  95          * else, it's the 4-byte scsi error result, with driver, host,
  96          * msg and status fields. The per-msgcode reply structure
  97          * will contain valid data.
  98          */
  99         uint32_t result;
 100
 101         /* If there was reply_payload, how much was recevied ? */
 102         uint32_t reply_payload_rcv_len;
 103
 104         union {
 105                 struct iscsi_bsg_host_vendor_reply      vendor_reply;
 106         } reply_data;
 107 };
 108
 109
 110 #endif /* SCSI_BSG_ISCSI_H */