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 received ? */
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 */
97