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