include/scsi/scsi_bsg_iscsi.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  *  iSCSI Transport BSG Interface
   4  *
   5  *  Copyright (C) 2009   James Smart, Emulex Corporation
   6  */
   7
   8 #ifndef SCSI_BSG_ISCSI_H
   9 #define SCSI_BSG_ISCSI_H
  10
  11 /*
  12  * This file intended to be included by both kernel and user space
  13  */
  14
  15 #include <scsi/scsi.h>
  16
  17 /*
  18  * iSCSI Transport SGIO v4 BSG Message Support
  19  */
  20
  21 /* Default BSG request timeout (in seconds) */
  22 #define ISCSI_DEFAULT_BSG_TIMEOUT      (10 * HZ)
  23
  24
  25 /*
  26  * Request Message Codes supported by the iSCSI Transport
  27  */
  28
  29 /* define the class masks for the message codes */
  30 #define ISCSI_BSG_CLS_MASK     0xF0000000      /* find object class */
  31 #define ISCSI_BSG_HST_MASK     0x80000000      /* iscsi host class */
  32
  33 /* iscsi host Message Codes */
  34 #define ISCSI_BSG_HST_VENDOR           (ISCSI_BSG_HST_MASK | 0x000000FF)
  35
  36
  37 /*
  38  * iSCSI Host Messages
  39  */
  40
  41 /* ISCSI_BSG_HST_VENDOR : */
  42
  43 /* Request:
  44  * Note: When specifying vendor_id, be sure to read the Vendor Type and ID
  45  *   formatting requirements specified in scsi_netlink.h
  46  */
  47 struct iscsi_bsg_host_vendor {
  48         /*
  49          * Identifies the vendor that the message is formatted for. This
  50          * should be the recipient of the message.
  51          */
  52         uint64_t vendor_id;
  53
  54         /* start of vendor command area */
  55         uint32_t vendor_cmd[];
  56 };
  57
  58 /* Response:
  59  */
  60 struct iscsi_bsg_host_vendor_reply {
  61         /* start of vendor response area */
  62         uint32_t vendor_rsp[0];
  63 };
  64
  65
  66 /* request (CDB) structure of the sg_io_v4 */
  67 struct iscsi_bsg_request {
  68         uint32_t msgcode;
  69         union {
  70                 struct iscsi_bsg_host_vendor    h_vendor;
  71         } rqst_data;
  72 } __attribute__((packed));
  73
  74
  75 /* response (request sense data) structure of the sg_io_v4 */
  76 struct iscsi_bsg_reply {
  77         /*
  78          * The completion result. Result exists in two forms:
  79          * if negative, it is an -Exxx system errno value. There will
  80          * be no further reply information supplied.
  81          * else, it's the 4-byte scsi error result, with driver, host,
  82          * msg and status fields. The per-msgcode reply structure
  83          * will contain valid data.
  84          */
  85         uint32_t result;
  86
  87         /* If there was reply_payload, how much was recevied ? */
  88         uint32_t reply_payload_rcv_len;
  89
  90         union {
  91                 struct iscsi_bsg_host_vendor_reply      vendor_reply;
  92         } reply_data;
  93 };
  94
  95
  96 #endif /* SCSI_BSG_ISCSI_H */