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 */
111