1 /* 2 * iSCSI lib definitions 3 * 4 * Copyright (C) 2006 Red Hat, Inc. All rights reserved. 5 * Copyright (C) 2004 - 2006 Mike Christie 6 * Copyright (C) 2004 - 2005 Dmitry Yusupov 7 * Copyright (C) 2004 - 2005 Alex Aizman 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 22 */ 23 #ifndef LIBISCSI_H 24 #define LIBISCSI_H 25 26 #include <linux/types.h> 27 #include <linux/mutex.h> 28 #include <linux/timer.h> 29 #include <linux/workqueue.h> 30 #include <scsi/iscsi_proto.h> 31 #include <scsi/iscsi_if.h> 32 33 struct scsi_transport_template; 34 struct scsi_device; 35 struct Scsi_Host; 36 struct scsi_cmnd; 37 struct socket; 38 struct iscsi_transport; 39 struct iscsi_cls_session; 40 struct iscsi_cls_conn; 41 struct iscsi_session; 42 struct iscsi_nopin; 43 44 /* #define DEBUG_SCSI */ 45 #ifdef DEBUG_SCSI 46 #define debug_scsi(fmt...) printk(KERN_INFO "iscsi: " fmt) 47 #else 48 #define debug_scsi(fmt...) 49 #endif 50 51 #define ISCSI_XMIT_CMDS_MAX 128 /* must be power of 2 */ 52 #define ISCSI_MGMT_CMDS_MAX 32 /* must be power of 2 */ 53 #define ISCSI_CONN_MAX 1 54 55 #define ISCSI_MGMT_ITT_OFFSET 0xa00 56 57 #define ISCSI_DEF_CMD_PER_LUN 32 58 #define ISCSI_MAX_CMD_PER_LUN 128 59 60 /* Task Mgmt states */ 61 #define TMABORT_INITIAL 0x0 62 #define TMABORT_SUCCESS 0x1 63 #define TMABORT_FAILED 0x2 64 #define TMABORT_TIMEDOUT 0x3 65 #define TMABORT_NOT_FOUND 0x4 66 67 /* Connection suspend "bit" */ 68 #define ISCSI_SUSPEND_BIT 1 69 70 #define ISCSI_ITT_MASK (0xfff) 71 #define ISCSI_CID_SHIFT 12 72 #define ISCSI_CID_MASK (0xffff << ISCSI_CID_SHIFT) 73 #define ISCSI_AGE_SHIFT 28 74 #define ISCSI_AGE_MASK (0xf << ISCSI_AGE_SHIFT) 75 76 struct iscsi_mgmt_task { 77 /* 78 * Becuae LLDs allocate their hdr differently, this is a pointer to 79 * that storage. It must be setup at session creation time. 80 */ 81 struct iscsi_hdr *hdr; 82 char *data; /* mgmt payload */ 83 int data_count; /* counts data to be sent */ 84 uint32_t itt; /* this ITT */ 85 void *dd_data; /* driver/transport data */ 86 struct list_head running; 87 }; 88 89 enum { 90 ISCSI_TASK_COMPLETED, 91 ISCSI_TASK_PENDING, 92 ISCSI_TASK_RUNNING, 93 }; 94 95 struct iscsi_cmd_task { 96 /* 97 * Becuae LLDs allocate their hdr differently, this is a pointer to 98 * that storage. It must be setup at session creation time. 99 */ 100 struct iscsi_cmd *hdr; 101 int itt; /* this ITT */ 102 int datasn; /* DataSN */ 103 104 uint32_t unsol_datasn; 105 int imm_count; /* imm-data (bytes) */ 106 int unsol_count; /* unsolicited (bytes)*/ 107 /* offset in unsolicited stream (bytes); */ 108 int unsol_offset; 109 int data_count; /* remaining Data-Out */ 110 struct scsi_cmnd *sc; /* associated SCSI cmd*/ 111 int total_length; 112 struct iscsi_conn *conn; /* used connection */ 113 struct iscsi_mgmt_task *mtask; /* tmf mtask in progr */ 114 115 /* state set/tested under session->lock */ 116 int state; 117 atomic_t refcount; 118 struct list_head running; /* running cmd list */ 119 void *dd_data; /* driver/transport data */ 120 }; 121 122 struct iscsi_conn { 123 struct iscsi_cls_conn *cls_conn; /* ptr to class connection */ 124 void *dd_data; /* iscsi_transport data */ 125 struct iscsi_session *session; /* parent session */ 126 /* 127 * LLDs should set this lock. It protects the transport recv 128 * code 129 */ 130 rwlock_t *recv_lock; 131 /* 132 * conn_stop() flag: stop to recover, stop to terminate 133 */ 134 int stop_stage; 135 136 /* iSCSI connection-wide sequencing */ 137 uint32_t exp_statsn; 138 139 /* control data */ 140 int id; /* CID */ 141 int c_stage; /* connection state */ 142 /* 143 * Preallocated buffer for pdus that have data but do not 144 * originate from scsi-ml. We never have two pdus using the 145 * buffer at the same time. It is only allocated to 146 * the default max recv size because the pdus we support 147 * should always fit in this buffer 148 */ 149 char *data; 150 struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */ 151 struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */ 152 struct iscsi_cmd_task *ctask; /* xmit ctask in progress */ 153 154 /* xmit */ 155 struct kfifo *immqueue; /* immediate xmit queue */ 156 struct kfifo *mgmtqueue; /* mgmt (control) xmit queue */ 157 struct list_head mgmt_run_list; /* list of control tasks */ 158 struct list_head xmitqueue; /* data-path cmd queue */ 159 struct list_head run_list; /* list of cmds in progress */ 160 struct work_struct xmitwork; /* per-conn. xmit workqueue */ 161 /* 162 * serializes connection xmit, access to kfifos: 163 * xmitqueue, immqueue, mgmtqueue 164 */ 165 struct mutex xmitmutex; 166 167 unsigned long suspend_tx; /* suspend Tx */ 168 unsigned long suspend_rx; /* suspend Rx */ 169 170 /* abort */ 171 wait_queue_head_t ehwait; /* used in eh_abort() */ 172 struct iscsi_tm tmhdr; 173 struct timer_list tmabort_timer; 174 int tmabort_state; /* see TMABORT_INITIAL, etc.*/ 175 176 /* negotiated params */ 177 int max_recv_dlength; /* initiator_max_recv_dsl*/ 178 int max_xmit_dlength; /* target_max_recv_dsl */ 179 int hdrdgst_en; 180 int datadgst_en; 181 int ifmarker_en; 182 int ofmarker_en; 183 /* values userspace uses to id a conn */ 184 int persistent_port; 185 char *persistent_address; 186 187 /* MIB-statistics */ 188 uint64_t txdata_octets; 189 uint64_t rxdata_octets; 190 uint32_t scsicmd_pdus_cnt; 191 uint32_t dataout_pdus_cnt; 192 uint32_t scsirsp_pdus_cnt; 193 uint32_t datain_pdus_cnt; 194 uint32_t r2t_pdus_cnt; 195 uint32_t tmfcmd_pdus_cnt; 196 int32_t tmfrsp_pdus_cnt; 197 198 /* custom statistics */ 199 uint32_t eh_abort_cnt; 200 }; 201 202 struct iscsi_queue { 203 struct kfifo *queue; /* FIFO Queue */ 204 void **pool; /* Pool of elements */ 205 int max; /* Max number of elements */ 206 }; 207 208 struct iscsi_session { 209 /* iSCSI session-wide sequencing */ 210 uint32_t cmdsn; 211 uint32_t exp_cmdsn; 212 uint32_t max_cmdsn; 213 214 /* configuration */ 215 int initial_r2t_en; 216 int max_r2t; 217 int imm_data_en; 218 int first_burst; 219 int max_burst; 220 int time2wait; 221 int time2retain; 222 int pdu_inorder_en; 223 int dataseq_inorder_en; 224 int erl; 225 int tpgt; 226 char *targetname; 227 228 /* control data */ 229 struct iscsi_transport *tt; 230 struct Scsi_Host *host; 231 struct iscsi_conn *leadconn; /* leading connection */ 232 spinlock_t lock; /* protects session state, * 233 * sequence numbers, * 234 * session resources: * 235 * - cmdpool, * 236 * - mgmtpool, * 237 * - r2tpool */ 238 int state; /* session state */ 239 int age; /* counts session re-opens */ 240 241 int cmds_max; /* size of cmds array */ 242 struct iscsi_cmd_task **cmds; /* Original Cmds arr */ 243 struct iscsi_queue cmdpool; /* PDU's pool */ 244 int mgmtpool_max; /* size of mgmt array */ 245 struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */ 246 struct iscsi_queue mgmtpool; /* Mgmt PDU's pool */ 247 }; 248 249 /* 250 * scsi host template 251 */ 252 extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth); 253 extern int iscsi_eh_abort(struct scsi_cmnd *sc); 254 extern int iscsi_eh_host_reset(struct scsi_cmnd *sc); 255 extern int iscsi_queuecommand(struct scsi_cmnd *sc, 256 void (*done)(struct scsi_cmnd *)); 257 258 /* 259 * session management 260 */ 261 extern struct iscsi_cls_session * 262 iscsi_session_setup(struct iscsi_transport *, struct scsi_transport_template *, 263 int, int, uint32_t, uint32_t *); 264 extern void iscsi_session_teardown(struct iscsi_cls_session *); 265 extern struct iscsi_session *class_to_transport_session(struct iscsi_cls_session *); 266 extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *); 267 extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn, 268 enum iscsi_param param, char *buf, int buflen); 269 extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session, 270 enum iscsi_param param, char *buf); 271 272 #define session_to_cls(_sess) \ 273 hostdata_session(_sess->host->hostdata) 274 275 /* 276 * connection management 277 */ 278 extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *, 279 uint32_t); 280 extern void iscsi_conn_teardown(struct iscsi_cls_conn *); 281 extern int iscsi_conn_start(struct iscsi_cls_conn *); 282 extern void iscsi_conn_stop(struct iscsi_cls_conn *, int); 283 extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *, 284 int); 285 extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err); 286 extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn, 287 enum iscsi_param param, char *buf); 288 289 /* 290 * pdu and task processing 291 */ 292 extern int iscsi_check_assign_cmdsn(struct iscsi_session *, 293 struct iscsi_nopin *); 294 extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *, 295 struct iscsi_data *hdr); 296 extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *, 297 char *, uint32_t); 298 extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, 299 char *, int); 300 extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, 301 char *, int); 302 extern int iscsi_verify_itt(struct iscsi_conn *, struct iscsi_hdr *, 303 uint32_t *); 304 305 /* 306 * generic helpers 307 */ 308 extern void iscsi_pool_free(struct iscsi_queue *, void **); 309 extern int iscsi_pool_init(struct iscsi_queue *, int, void ***, int); 310 311 #endif 312