1 /* 2 * iSCSI transport class definitions 3 * 4 * Copyright (C) IBM Corporation, 2004 5 * Copyright (C) Mike Christie, 2004 - 2006 6 * Copyright (C) Dmitry Yusupov, 2004 - 2005 7 * Copyright (C) Alex Aizman, 2004 - 2005 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 SCSI_TRANSPORT_ISCSI_H 24 #define SCSI_TRANSPORT_ISCSI_H 25 26 #include <linux/device.h> 27 #include <linux/list.h> 28 #include <linux/mutex.h> 29 #include <scsi/iscsi_if.h> 30 31 struct scsi_transport_template; 32 struct iscsi_transport; 33 struct iscsi_endpoint; 34 struct Scsi_Host; 35 struct scsi_cmnd; 36 struct iscsi_cls_conn; 37 struct iscsi_conn; 38 struct iscsi_task; 39 struct sockaddr; 40 struct iscsi_iface; 41 struct bsg_job; 42 43 /** 44 * struct iscsi_transport - iSCSI Transport template 45 * 46 * @name: transport name 47 * @caps: iSCSI Data-Path capabilities 48 * @create_session: create new iSCSI session object 49 * @destroy_session: destroy existing iSCSI session object 50 * @create_conn: create new iSCSI connection 51 * @bind_conn: associate this connection with existing iSCSI session 52 * and specified transport descriptor 53 * @destroy_conn: destroy inactive iSCSI connection 54 * @set_param: set iSCSI parameter. Return 0 on success, -ENODATA 55 * when param is not supported, and a -Exx value on other 56 * error. 57 * @get_param get iSCSI parameter. Must return number of bytes 58 * copied to buffer on success, -ENODATA when param 59 * is not supported, and a -Exx value on other error 60 * @start_conn: set connection to be operational 61 * @stop_conn: suspend/recover/terminate connection 62 * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text. 63 * @session_recovery_timedout: notify LLD a block during recovery timed out 64 * @init_task: Initialize a iscsi_task and any internal structs. 65 * When offloading the data path, this is called from 66 * queuecommand with the session lock, or from the 67 * iscsi_conn_send_pdu context with the session lock. 68 * When not offloading the data path, this is called 69 * from the scsi work queue without the session lock. 70 * @xmit_task Requests LLD to transfer cmd task. Returns 0 or the 71 * the number of bytes transferred on success, and -Exyz 72 * value on error. When offloading the data path, this 73 * is called from queuecommand with the session lock, or 74 * from the iscsi_conn_send_pdu context with the session 75 * lock. When not offloading the data path, this is called 76 * from the scsi work queue without the session lock. 77 * @cleanup_task: requests LLD to fail task. Called with session lock 78 * and after the connection has been suspended and 79 * terminated during recovery. If called 80 * from abort task then connection is not suspended 81 * or terminated but sk_callback_lock is held 82 * 83 * Template API provided by iSCSI Transport 84 */ 85 struct iscsi_transport { 86 struct module *owner; 87 char *name; 88 unsigned int caps; 89 90 struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep, 91 uint16_t cmds_max, uint16_t qdepth, 92 uint32_t sn); 93 void (*destroy_session) (struct iscsi_cls_session *session); 94 struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess, 95 uint32_t cid); 96 int (*bind_conn) (struct iscsi_cls_session *session, 97 struct iscsi_cls_conn *cls_conn, 98 uint64_t transport_eph, int is_leading); 99 int (*start_conn) (struct iscsi_cls_conn *conn); 100 void (*stop_conn) (struct iscsi_cls_conn *conn, int flag); 101 void (*destroy_conn) (struct iscsi_cls_conn *conn); 102 int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param, 103 char *buf, int buflen); 104 int (*get_ep_param) (struct iscsi_endpoint *ep, enum iscsi_param param, 105 char *buf); 106 int (*get_conn_param) (struct iscsi_cls_conn *conn, 107 enum iscsi_param param, char *buf); 108 int (*get_session_param) (struct iscsi_cls_session *session, 109 enum iscsi_param param, char *buf); 110 int (*get_host_param) (struct Scsi_Host *shost, 111 enum iscsi_host_param param, char *buf); 112 int (*set_host_param) (struct Scsi_Host *shost, 113 enum iscsi_host_param param, char *buf, 114 int buflen); 115 int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, 116 char *data, uint32_t data_size); 117 void (*get_stats) (struct iscsi_cls_conn *conn, 118 struct iscsi_stats *stats); 119 120 int (*init_task) (struct iscsi_task *task); 121 int (*xmit_task) (struct iscsi_task *task); 122 void (*cleanup_task) (struct iscsi_task *task); 123 124 int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode); 125 int (*xmit_pdu) (struct iscsi_task *task); 126 int (*init_pdu) (struct iscsi_task *task, unsigned int offset, 127 unsigned int count); 128 void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt, 129 int *index, int *age); 130 131 void (*session_recovery_timedout) (struct iscsi_cls_session *session); 132 struct iscsi_endpoint *(*ep_connect) (struct Scsi_Host *shost, 133 struct sockaddr *dst_addr, 134 int non_blocking); 135 int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms); 136 void (*ep_disconnect) (struct iscsi_endpoint *ep); 137 int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type, 138 uint32_t enable, struct sockaddr *dst_addr); 139 int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params); 140 int (*set_iface_param) (struct Scsi_Host *shost, char *data, int count); 141 int (*get_iface_param) (struct iscsi_iface *iface, 142 enum iscsi_param_type param_type, 143 int param, char *buf); 144 mode_t (*attr_is_visible)(int param_type, int param); 145 int (*bsg_request)(struct bsg_job *job); 146 }; 147 148 /* 149 * transport registration upcalls 150 */ 151 extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt); 152 extern int iscsi_unregister_transport(struct iscsi_transport *tt); 153 154 /* 155 * control plane upcalls 156 */ 157 extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn, 158 enum iscsi_err error); 159 extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn, 160 enum iscsi_conn_state state); 161 extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, 162 char *data, uint32_t data_size); 163 164 extern int iscsi_offload_mesg(struct Scsi_Host *shost, 165 struct iscsi_transport *transport, uint32_t type, 166 char *data, uint16_t data_size); 167 168 struct iscsi_cls_conn { 169 struct list_head conn_list; /* item in connlist */ 170 void *dd_data; /* LLD private data */ 171 struct iscsi_transport *transport; 172 uint32_t cid; /* connection id */ 173 struct mutex ep_mutex; 174 struct iscsi_endpoint *ep; 175 176 struct device dev; /* sysfs transport/container device */ 177 }; 178 179 #define iscsi_dev_to_conn(_dev) \ 180 container_of(_dev, struct iscsi_cls_conn, dev) 181 182 #define transport_class_to_conn(_cdev) \ 183 iscsi_dev_to_conn(_cdev->parent) 184 185 #define iscsi_conn_to_session(_conn) \ 186 iscsi_dev_to_session(_conn->dev.parent) 187 188 /* iscsi class session state */ 189 enum { 190 ISCSI_SESSION_LOGGED_IN, 191 ISCSI_SESSION_FAILED, 192 ISCSI_SESSION_FREE, 193 }; 194 195 #define ISCSI_MAX_TARGET -1 196 197 struct iscsi_cls_session { 198 struct list_head sess_list; /* item in session_list */ 199 struct iscsi_transport *transport; 200 spinlock_t lock; 201 struct work_struct block_work; 202 struct work_struct unblock_work; 203 struct work_struct scan_work; 204 struct work_struct unbind_work; 205 206 /* recovery fields */ 207 int recovery_tmo; 208 struct delayed_work recovery_work; 209 210 unsigned int target_id; 211 bool ida_used; 212 213 int state; 214 int sid; /* session id */ 215 void *dd_data; /* LLD private data */ 216 struct device dev; /* sysfs transport/container device */ 217 }; 218 219 #define iscsi_dev_to_session(_dev) \ 220 container_of(_dev, struct iscsi_cls_session, dev) 221 222 #define transport_class_to_session(_cdev) \ 223 iscsi_dev_to_session(_cdev->parent) 224 225 #define iscsi_session_to_shost(_session) \ 226 dev_to_shost(_session->dev.parent) 227 228 #define starget_to_session(_stgt) \ 229 iscsi_dev_to_session(_stgt->dev.parent) 230 231 struct iscsi_cls_host { 232 atomic_t nr_scans; 233 struct mutex mutex; 234 struct request_queue *bsg_q; 235 }; 236 237 #define iscsi_job_to_shost(_job) \ 238 dev_to_shost(_job->dev) 239 240 extern void iscsi_host_for_each_session(struct Scsi_Host *shost, 241 void (*fn)(struct iscsi_cls_session *)); 242 243 struct iscsi_endpoint { 244 void *dd_data; /* LLD private data */ 245 struct device dev; 246 uint64_t id; 247 struct iscsi_cls_conn *conn; 248 }; 249 250 struct iscsi_iface { 251 struct device dev; 252 struct iscsi_transport *transport; 253 uint32_t iface_type; /* IPv4 or IPv6 */ 254 uint32_t iface_num; /* iface number, 0 - n */ 255 void *dd_data; /* LLD private data */ 256 }; 257 258 #define iscsi_dev_to_iface(_dev) \ 259 container_of(_dev, struct iscsi_iface, dev) 260 261 #define iscsi_iface_to_shost(_iface) \ 262 dev_to_shost(_iface->dev.parent) 263 264 /* 265 * session and connection functions that can be used by HW iSCSI LLDs 266 */ 267 #define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \ 268 dev_printk(prefix, &(_cls_session)->dev, fmt, ##a) 269 270 #define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \ 271 dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a) 272 273 extern int iscsi_session_chkready(struct iscsi_cls_session *session); 274 extern int iscsi_is_session_online(struct iscsi_cls_session *session); 275 extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost, 276 struct iscsi_transport *transport, int dd_size); 277 extern int iscsi_add_session(struct iscsi_cls_session *session, 278 unsigned int target_id); 279 extern int iscsi_session_event(struct iscsi_cls_session *session, 280 enum iscsi_uevent_e event); 281 extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, 282 struct iscsi_transport *t, 283 int dd_size, 284 unsigned int target_id); 285 extern void iscsi_remove_session(struct iscsi_cls_session *session); 286 extern void iscsi_free_session(struct iscsi_cls_session *session); 287 extern int iscsi_destroy_session(struct iscsi_cls_session *session); 288 extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, 289 int dd_size, uint32_t cid); 290 extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); 291 extern void iscsi_unblock_session(struct iscsi_cls_session *session); 292 extern void iscsi_block_session(struct iscsi_cls_session *session); 293 extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time); 294 extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size); 295 extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep); 296 extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle); 297 extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd); 298 extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost, 299 struct iscsi_transport *t, 300 uint32_t iface_type, 301 uint32_t iface_num, int dd_size); 302 extern void iscsi_destroy_iface(struct iscsi_iface *iface); 303 extern struct iscsi_iface *iscsi_lookup_iface(int handle); 304 305 #endif 306