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 <scsi/iscsi_proto.h> 29 #include <scsi/iscsi_if.h> 30 31 struct scsi_transport_template; 32 struct scsi_device; 33 struct Scsi_Host; 34 struct scsi_cmnd; 35 struct socket; 36 struct iscsi_transport; 37 struct iscsi_cls_session; 38 struct iscsi_cls_conn; 39 struct iscsi_session; 40 struct iscsi_nopin; 41 42 /* #define DEBUG_SCSI */ 43 #ifdef DEBUG_SCSI 44 #define debug_scsi(fmt...) printk(KERN_INFO "iscsi: " fmt) 45 #else 46 #define debug_scsi(fmt...) 47 #endif 48 49 #define ISCSI_XMIT_CMDS_MAX 128 /* must be power of 2 */ 50 #define ISCSI_MGMT_CMDS_MAX 32 /* must be power of 2 */ 51 #define ISCSI_CONN_MAX 1 52 53 #define ISCSI_MGMT_ITT_OFFSET 0xa00 54 55 #define ISCSI_DEF_CMD_PER_LUN 32 56 #define ISCSI_MAX_CMD_PER_LUN 128 57 58 /* Task Mgmt states */ 59 #define TMABORT_INITIAL 0x0 60 #define TMABORT_SUCCESS 0x1 61 #define TMABORT_FAILED 0x2 62 #define TMABORT_TIMEDOUT 0x3 63 64 /* Connection suspend "bit" */ 65 #define ISCSI_SUSPEND_BIT 1 66 67 #define ISCSI_ITT_MASK (0xfff) 68 #define ISCSI_CID_SHIFT 12 69 #define ISCSI_CID_MASK (0xffff << ISCSI_CID_SHIFT) 70 #define ISCSI_AGE_SHIFT 28 71 #define ISCSI_AGE_MASK (0xf << ISCSI_AGE_SHIFT) 72 73 struct iscsi_mgmt_task { 74 /* 75 * Becuae LLDs allocate their hdr differently, this is a pointer to 76 * that storage. It must be setup at session creation time. 77 */ 78 struct iscsi_hdr *hdr; 79 char *data; /* mgmt payload */ 80 int data_count; /* counts data to be sent */ 81 uint32_t itt; /* this ITT */ 82 void *dd_data; /* driver/transport data */ 83 struct list_head running; 84 }; 85 86 struct iscsi_cmd_task { 87 /* 88 * Becuae LLDs allocate their hdr differently, this is a pointer to 89 * that storage. It must be setup at session creation time. 90 */ 91 struct iscsi_cmd *hdr; 92 int itt; /* this ITT */ 93 int datasn; /* DataSN */ 94 95 uint32_t unsol_datasn; 96 int imm_count; /* imm-data (bytes) */ 97 int unsol_count; /* unsolicited (bytes)*/ 98 int data_count; /* remaining Data-Out */ 99 struct scsi_cmnd *sc; /* associated SCSI cmd*/ 100 int total_length; 101 struct iscsi_conn *conn; /* used connection */ 102 struct iscsi_mgmt_task *mtask; /* tmf mtask in progr */ 103 104 struct list_head running; /* running cmd list */ 105 void *dd_data; /* driver/transport data */ 106 }; 107 108 struct iscsi_conn { 109 struct iscsi_cls_conn *cls_conn; /* ptr to class connection */ 110 void *dd_data; /* iscsi_transport data */ 111 struct iscsi_session *session; /* parent session */ 112 /* 113 * LLDs should set this lock. It protects the transport recv 114 * code 115 */ 116 rwlock_t *recv_lock; 117 /* 118 * conn_stop() flag: stop to recover, stop to terminate 119 */ 120 int stop_stage; 121 122 /* iSCSI connection-wide sequencing */ 123 uint32_t exp_statsn; 124 125 /* control data */ 126 int id; /* CID */ 127 struct list_head item; /* maintains list of conns */ 128 int c_stage; /* connection state */ 129 struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */ 130 struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */ 131 struct iscsi_cmd_task *ctask; /* xmit ctask in progress */ 132 133 /* xmit */ 134 struct kfifo *immqueue; /* immediate xmit queue */ 135 struct kfifo *mgmtqueue; /* mgmt (control) xmit queue */ 136 struct list_head mgmt_run_list; /* list of control tasks */ 137 struct kfifo *xmitqueue; /* data-path cmd queue */ 138 struct list_head run_list; /* list of cmds in progress */ 139 struct work_struct xmitwork; /* per-conn. xmit workqueue */ 140 /* 141 * serializes connection xmit, access to kfifos: 142 * xmitqueue, immqueue, mgmtqueue 143 */ 144 struct mutex xmitmutex; 145 146 unsigned long suspend_tx; /* suspend Tx */ 147 unsigned long suspend_rx; /* suspend Rx */ 148 149 /* abort */ 150 wait_queue_head_t ehwait; /* used in eh_abort() */ 151 struct iscsi_tm tmhdr; 152 struct timer_list tmabort_timer; 153 int tmabort_state; /* see TMABORT_INITIAL, etc.*/ 154 155 /* negotiated params */ 156 int max_recv_dlength; /* initiator_max_recv_dsl*/ 157 int max_xmit_dlength; /* target_max_recv_dsl */ 158 int hdrdgst_en; 159 int datadgst_en; 160 161 /* MIB-statistics */ 162 uint64_t txdata_octets; 163 uint64_t rxdata_octets; 164 uint32_t scsicmd_pdus_cnt; 165 uint32_t dataout_pdus_cnt; 166 uint32_t scsirsp_pdus_cnt; 167 uint32_t datain_pdus_cnt; 168 uint32_t r2t_pdus_cnt; 169 uint32_t tmfcmd_pdus_cnt; 170 int32_t tmfrsp_pdus_cnt; 171 172 /* custom statistics */ 173 uint32_t eh_abort_cnt; 174 }; 175 176 struct iscsi_queue { 177 struct kfifo *queue; /* FIFO Queue */ 178 void **pool; /* Pool of elements */ 179 int max; /* Max number of elements */ 180 }; 181 182 struct iscsi_session { 183 /* iSCSI session-wide sequencing */ 184 uint32_t cmdsn; 185 uint32_t exp_cmdsn; 186 uint32_t max_cmdsn; 187 188 /* configuration */ 189 int initial_r2t_en; 190 int max_r2t; 191 int imm_data_en; 192 int first_burst; 193 int max_burst; 194 int time2wait; 195 int time2retain; 196 int pdu_inorder_en; 197 int dataseq_inorder_en; 198 int erl; 199 int ifmarker_en; 200 int ofmarker_en; 201 202 /* control data */ 203 struct iscsi_transport *tt; 204 struct Scsi_Host *host; 205 struct iscsi_conn *leadconn; /* leading connection */ 206 spinlock_t lock; /* protects session state, * 207 * sequence numbers, * 208 * session resources: * 209 * - cmdpool, * 210 * - mgmtpool, * 211 * - r2tpool */ 212 int state; /* session state */ 213 struct list_head item; 214 int age; /* counts session re-opens */ 215 216 struct list_head connections; /* list of connections */ 217 int cmds_max; /* size of cmds array */ 218 struct iscsi_cmd_task **cmds; /* Original Cmds arr */ 219 struct iscsi_queue cmdpool; /* PDU's pool */ 220 int mgmtpool_max; /* size of mgmt array */ 221 struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */ 222 struct iscsi_queue mgmtpool; /* Mgmt PDU's pool */ 223 }; 224 225 /* 226 * scsi host template 227 */ 228 extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth); 229 extern int iscsi_eh_abort(struct scsi_cmnd *sc); 230 extern int iscsi_eh_host_reset(struct scsi_cmnd *sc); 231 extern int iscsi_queuecommand(struct scsi_cmnd *sc, 232 void (*done)(struct scsi_cmnd *)); 233 234 /* 235 * session management 236 */ 237 extern struct iscsi_cls_session * 238 iscsi_session_setup(struct iscsi_transport *, struct scsi_transport_template *, 239 int, int, uint32_t, uint32_t *); 240 extern void iscsi_session_teardown(struct iscsi_cls_session *); 241 extern struct iscsi_session *class_to_transport_session(struct iscsi_cls_session *); 242 extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *); 243 244 #define session_to_cls(_sess) \ 245 hostdata_session(_sess->host->hostdata) 246 247 /* 248 * connection management 249 */ 250 extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *, 251 uint32_t); 252 extern void iscsi_conn_teardown(struct iscsi_cls_conn *); 253 extern int iscsi_conn_start(struct iscsi_cls_conn *); 254 extern void iscsi_conn_stop(struct iscsi_cls_conn *, int); 255 extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *, 256 int); 257 extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err); 258 259 /* 260 * pdu and task processing 261 */ 262 extern int iscsi_check_assign_cmdsn(struct iscsi_session *, 263 struct iscsi_nopin *); 264 extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *, 265 struct iscsi_data *hdr, 266 int transport_data_cnt); 267 extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *, 268 char *, uint32_t); 269 extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, 270 char *, int); 271 extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, 272 char *, int); 273 extern int iscsi_verify_itt(struct iscsi_conn *, struct iscsi_hdr *, 274 uint32_t *); 275 276 /* 277 * generic helpers 278 */ 279 extern void iscsi_pool_free(struct iscsi_queue *, void **); 280 extern int iscsi_pool_init(struct iscsi_queue *, int, void ***, int); 281 282 #endif 283