1 /* 2 * Copyright (c) 2005 Cisco Systems. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 * 32 * $Id$ 33 */ 34 35 #ifndef SCSI_SRP_H 36 #define SCSI_SRP_H 37 38 /* 39 * Structures and constants for the SCSI RDMA Protocol (SRP) as 40 * defined by the INCITS T10 committee. This file was written using 41 * draft Revision 16a of the SRP standard. 42 */ 43 44 #include <linux/types.h> 45 #include <scsi/scsi.h> 46 47 enum { 48 SRP_LOGIN_REQ = 0x00, 49 SRP_TSK_MGMT = 0x01, 50 SRP_CMD = 0x02, 51 SRP_I_LOGOUT = 0x03, 52 SRP_LOGIN_RSP = 0xc0, 53 SRP_RSP = 0xc1, 54 SRP_LOGIN_REJ = 0xc2, 55 SRP_T_LOGOUT = 0x80, 56 SRP_CRED_REQ = 0x81, 57 SRP_AER_REQ = 0x82, 58 SRP_CRED_RSP = 0x41, 59 SRP_AER_RSP = 0x42 60 }; 61 62 enum { 63 SRP_BUF_FORMAT_DIRECT = 1 << 1, 64 SRP_BUF_FORMAT_INDIRECT = 1 << 2 65 }; 66 67 enum { 68 SRP_NO_DATA_DESC = 0, 69 SRP_DATA_DESC_DIRECT = 1, 70 SRP_DATA_DESC_INDIRECT = 2 71 }; 72 73 enum { 74 SRP_TSK_ABORT_TASK = 0x01, 75 SRP_TSK_ABORT_TASK_SET = 0x02, 76 SRP_TSK_CLEAR_TASK_SET = 0x04, 77 SRP_TSK_LUN_RESET = 0x08, 78 SRP_TSK_CLEAR_ACA = 0x40 79 }; 80 81 enum srp_login_rej_reason { 82 SRP_LOGIN_REJ_UNABLE_ESTABLISH_CHANNEL = 0x00010000, 83 SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES = 0x00010001, 84 SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE = 0x00010002, 85 SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL = 0x00010003, 86 SRP_LOGIN_REJ_UNSUPPORTED_DESCRIPTOR_FMT = 0x00010004, 87 SRP_LOGIN_REJ_MULTI_CHANNEL_UNSUPPORTED = 0x00010005, 88 SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED = 0x00010006 89 }; 90 91 enum { 92 SRP_REV10_IB_IO_CLASS = 0xff00, 93 SRP_REV16A_IB_IO_CLASS = 0x0100 94 }; 95 96 struct srp_direct_buf { 97 __be64 va; 98 __be32 key; 99 __be32 len; 100 }; 101 102 /* 103 * We need the packed attribute because the SRP spec puts the list of 104 * descriptors at an offset of 20, which is not aligned to the size of 105 * struct srp_direct_buf. The whole structure must be packed to avoid 106 * having the 20-byte structure padded to 24 bytes on 64-bit architectures. 107 */ 108 struct srp_indirect_buf { 109 struct srp_direct_buf table_desc; 110 __be32 len; 111 struct srp_direct_buf desc_list[0]; 112 } __attribute__((packed)); 113 114 enum { 115 SRP_MULTICHAN_SINGLE = 0, 116 SRP_MULTICHAN_MULTI = 1 117 }; 118 119 struct srp_login_req { 120 u8 opcode; 121 u8 reserved1[7]; 122 u64 tag; 123 __be32 req_it_iu_len; 124 u8 reserved2[4]; 125 __be16 req_buf_fmt; 126 u8 req_flags; 127 u8 reserved3[5]; 128 u8 initiator_port_id[16]; 129 u8 target_port_id[16]; 130 }; 131 132 /** 133 * struct srp_login_req_rdma - RDMA/CM login parameters. 134 * 135 * RDMA/CM over InfiniBand can only carry 92 - 36 = 56 bytes of private 136 * data. The %srp_login_req_rdma structure contains the same information as 137 * %srp_login_req but with the reserved data removed. 138 */ 139 struct srp_login_req_rdma { 140 u64 tag; 141 __be16 req_buf_fmt; 142 u8 req_flags; 143 u8 opcode; 144 __be32 req_it_iu_len; 145 u8 initiator_port_id[16]; 146 u8 target_port_id[16]; 147 }; 148 149 /* 150 * The SRP spec defines the size of the LOGIN_RSP structure to be 52 151 * bytes, so it needs to be packed to avoid having it padded to 56 152 * bytes on 64-bit architectures. 153 */ 154 struct srp_login_rsp { 155 u8 opcode; 156 u8 reserved1[3]; 157 __be32 req_lim_delta; 158 u64 tag; 159 __be32 max_it_iu_len; 160 __be32 max_ti_iu_len; 161 __be16 buf_fmt; 162 u8 rsp_flags; 163 u8 reserved2[25]; 164 } __attribute__((packed)); 165 166 struct srp_login_rej { 167 u8 opcode; 168 u8 reserved1[3]; 169 __be32 reason; 170 u64 tag; 171 u8 reserved2[8]; 172 __be16 buf_fmt; 173 u8 reserved3[6]; 174 }; 175 176 struct srp_i_logout { 177 u8 opcode; 178 u8 reserved[7]; 179 u64 tag; 180 }; 181 182 struct srp_t_logout { 183 u8 opcode; 184 u8 sol_not; 185 u8 reserved[2]; 186 __be32 reason; 187 u64 tag; 188 }; 189 190 /* 191 * We need the packed attribute because the SRP spec only aligns the 192 * 8-byte LUN field to 4 bytes. 193 */ 194 struct srp_tsk_mgmt { 195 u8 opcode; 196 u8 sol_not; 197 u8 reserved1[6]; 198 u64 tag; 199 u8 reserved2[4]; 200 struct scsi_lun lun; 201 u8 reserved3[2]; 202 u8 tsk_mgmt_func; 203 u8 reserved4; 204 u64 task_tag; 205 u8 reserved5[8]; 206 }; 207 208 /* 209 * We need the packed attribute because the SRP spec only aligns the 210 * 8-byte LUN field to 4 bytes. 211 */ 212 struct srp_cmd { 213 u8 opcode; 214 u8 sol_not; 215 u8 reserved1[3]; 216 u8 buf_fmt; 217 u8 data_out_desc_cnt; 218 u8 data_in_desc_cnt; 219 u64 tag; 220 u8 reserved2[4]; 221 struct scsi_lun lun; 222 u8 reserved3; 223 u8 task_attr; 224 u8 reserved4; 225 u8 add_cdb_len; 226 u8 cdb[16]; 227 u8 add_data[0]; 228 }; 229 230 enum { 231 SRP_RSP_FLAG_RSPVALID = 1 << 0, 232 SRP_RSP_FLAG_SNSVALID = 1 << 1, 233 SRP_RSP_FLAG_DOOVER = 1 << 2, 234 SRP_RSP_FLAG_DOUNDER = 1 << 3, 235 SRP_RSP_FLAG_DIOVER = 1 << 4, 236 SRP_RSP_FLAG_DIUNDER = 1 << 5 237 }; 238 239 /* 240 * The SRP spec defines the size of the RSP structure to be 36 bytes, 241 * so it needs to be packed to avoid having it padded to 40 bytes on 242 * 64-bit architectures. 243 */ 244 struct srp_rsp { 245 u8 opcode; 246 u8 sol_not; 247 u8 reserved1[2]; 248 __be32 req_lim_delta; 249 u64 tag; 250 u8 reserved2[2]; 251 u8 flags; 252 u8 status; 253 __be32 data_out_res_cnt; 254 __be32 data_in_res_cnt; 255 __be32 sense_data_len; 256 __be32 resp_data_len; 257 u8 data[0]; 258 } __attribute__((packed)); 259 260 struct srp_cred_req { 261 u8 opcode; 262 u8 sol_not; 263 u8 reserved[2]; 264 __be32 req_lim_delta; 265 u64 tag; 266 }; 267 268 struct srp_cred_rsp { 269 u8 opcode; 270 u8 reserved[7]; 271 u64 tag; 272 }; 273 274 /* 275 * The SRP spec defines the fixed portion of the AER_REQ structure to be 276 * 36 bytes, so it needs to be packed to avoid having it padded to 40 bytes 277 * on 64-bit architectures. 278 */ 279 struct srp_aer_req { 280 u8 opcode; 281 u8 sol_not; 282 u8 reserved[2]; 283 __be32 req_lim_delta; 284 u64 tag; 285 u32 reserved2; 286 struct scsi_lun lun; 287 __be32 sense_data_len; 288 u32 reserved3; 289 u8 sense_data[0]; 290 } __attribute__((packed)); 291 292 struct srp_aer_rsp { 293 u8 opcode; 294 u8 reserved[7]; 295 u64 tag; 296 }; 297 298 #endif /* SCSI_SRP_H */ 299