11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * iSCSI transport class definitions 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (C) IBM Corporation, 2004 57996a778SMike Christie * Copyright (C) Mike Christie, 2004 - 2006 639e84790SAlex Aizman * Copyright (C) Dmitry Yusupov, 2004 - 2005 739e84790SAlex Aizman * Copyright (C) Alex Aizman, 2004 - 2005 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 101da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 111da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 121da177e4SLinus Torvalds * (at your option) any later version. 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 151da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 161da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 171da177e4SLinus Torvalds * GNU General Public License for more details. 181da177e4SLinus Torvalds * 191da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 201da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 211da177e4SLinus Torvalds * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 221da177e4SLinus Torvalds */ 231da177e4SLinus Torvalds #ifndef SCSI_TRANSPORT_ISCSI_H 241da177e4SLinus Torvalds #define SCSI_TRANSPORT_ISCSI_H 251da177e4SLinus Torvalds 267b8631b5SMike Christie #include <linux/device.h> 2739e84790SAlex Aizman #include <scsi/iscsi_if.h> 281da177e4SLinus Torvalds 297b8631b5SMike Christie struct scsi_transport_template; 307996a778SMike Christie struct iscsi_transport; 317b8631b5SMike Christie struct Scsi_Host; 327b8631b5SMike Christie struct mempool_zone; 337b8631b5SMike Christie struct iscsi_cls_conn; 347996a778SMike Christie struct iscsi_conn; 357996a778SMike Christie struct iscsi_cmd_task; 367996a778SMike Christie struct iscsi_mgmt_task; 377b8631b5SMike Christie 3839e84790SAlex Aizman /** 3939e84790SAlex Aizman * struct iscsi_transport - iSCSI Transport template 4039e84790SAlex Aizman * 4139e84790SAlex Aizman * @name: transport name 4239e84790SAlex Aizman * @caps: iSCSI Data-Path capabilities 4339e84790SAlex Aizman * @create_session: create new iSCSI session object 4439e84790SAlex Aizman * @destroy_session: destroy existing iSCSI session object 4539e84790SAlex Aizman * @create_conn: create new iSCSI connection 4639e84790SAlex Aizman * @bind_conn: associate this connection with existing iSCSI session 4739e84790SAlex Aizman * and specified transport descriptor 4839e84790SAlex Aizman * @destroy_conn: destroy inactive iSCSI connection 4939e84790SAlex Aizman * @set_param: set iSCSI Data-Path operational parameter 5039e84790SAlex Aizman * @start_conn: set connection to be operational 5139e84790SAlex Aizman * @stop_conn: suspend/recover/terminate connection 5239e84790SAlex Aizman * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text. 537996a778SMike Christie * @session_recovery_timedout: notify LLD a block during recovery timed out 547996a778SMike Christie * @suspend_conn_recv: susepend the recv side of the connection 557996a778SMike Christie * @termincate_conn: destroy socket connection. Called with mutex lock. 567996a778SMike Christie * @init_cmd_task: Initialize a iscsi_cmd_task and any internal structs. 577996a778SMike Christie * Called from queuecommand with session lock held. 587996a778SMike Christie * @init_mgmt_task: Initialize a iscsi_mgmt_task and any internal structs. 597996a778SMike Christie * Called from iscsi_conn_send_generic with xmitmutex. 607996a778SMike Christie * @xmit_cmd_task: requests LLD to transfer cmd task 617996a778SMike Christie * @xmit_mgmt_task: requests LLD to transfer mgmt task 627996a778SMike Christie * @cleanup_cmd_task: requests LLD to fail cmd task. Called with xmitmutex 637996a778SMike Christie * and session->lock after the connection has been 647996a778SMike Christie * suspended and terminated during recovery. If called 657996a778SMike Christie * from abort task then connection is not suspended 667996a778SMike Christie * or terminated but sk_callback_lock is held 6739e84790SAlex Aizman * 6839e84790SAlex Aizman * Template API provided by iSCSI Transport 6939e84790SAlex Aizman */ 7039e84790SAlex Aizman struct iscsi_transport { 7139e84790SAlex Aizman struct module *owner; 7239e84790SAlex Aizman char *name; 7339e84790SAlex Aizman unsigned int caps; 74fd7255f5SMike Christie /* LLD sets this to indicate what values it can export to sysfs */ 75fd7255f5SMike Christie unsigned int param_mask; 7639e84790SAlex Aizman struct scsi_host_template *host_template; 777b8631b5SMike Christie /* LLD connection data size */ 787b8631b5SMike Christie int conndata_size; 79b5c7a12dSMike Christie /* LLD session data size */ 80b5c7a12dSMike Christie int sessiondata_size; 8139e84790SAlex Aizman int max_lun; 8239e84790SAlex Aizman unsigned int max_conn; 8339e84790SAlex Aizman unsigned int max_cmd_len; 847996a778SMike Christie struct iscsi_cls_session *(*create_session) (struct iscsi_transport *it, 857996a778SMike Christie struct scsi_transport_template *t, uint32_t sn, uint32_t *hn); 867b7232f3SMike Christie void (*destroy_session) (struct iscsi_cls_session *session); 877b7232f3SMike Christie struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess, 887b8631b5SMike Christie uint32_t cid); 897b7232f3SMike Christie int (*bind_conn) (struct iscsi_cls_session *session, 907b7232f3SMike Christie struct iscsi_cls_conn *cls_conn, 9139e84790SAlex Aizman uint32_t transport_fd, int is_leading); 927b7232f3SMike Christie int (*start_conn) (struct iscsi_cls_conn *conn); 937b7232f3SMike Christie void (*stop_conn) (struct iscsi_cls_conn *conn, int flag); 947b8631b5SMike Christie void (*destroy_conn) (struct iscsi_cls_conn *conn); 957b7232f3SMike Christie int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param, 9639e84790SAlex Aizman uint32_t value); 977b7232f3SMike Christie int (*get_conn_param) (struct iscsi_cls_conn *conn, 98fd7255f5SMike Christie enum iscsi_param param, uint32_t *value); 997b7232f3SMike Christie int (*get_session_param) (struct iscsi_cls_session *session, 1007b8631b5SMike Christie enum iscsi_param param, uint32_t *value); 101fd7255f5SMike Christie int (*get_conn_str_param) (struct iscsi_cls_conn *conn, 102fd7255f5SMike Christie enum iscsi_param param, char *buf); 103fd7255f5SMike Christie int (*get_session_str_param) (struct iscsi_cls_session *session, 104fd7255f5SMike Christie enum iscsi_param param, char *buf); 1057b7232f3SMike Christie int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, 10639e84790SAlex Aizman char *data, uint32_t data_size); 1077b7232f3SMike Christie void (*get_stats) (struct iscsi_cls_conn *conn, 1087b7232f3SMike Christie struct iscsi_stats *stats); 1097996a778SMike Christie void (*suspend_conn_recv) (struct iscsi_conn *conn); 1107996a778SMike Christie void (*terminate_conn) (struct iscsi_conn *conn); 1117996a778SMike Christie void (*init_cmd_task) (struct iscsi_cmd_task *ctask); 1127996a778SMike Christie void (*init_mgmt_task) (struct iscsi_conn *conn, 1137996a778SMike Christie struct iscsi_mgmt_task *mtask, 1147996a778SMike Christie char *data, uint32_t data_size); 1157996a778SMike Christie int (*xmit_cmd_task) (struct iscsi_conn *conn, 1167996a778SMike Christie struct iscsi_cmd_task *ctask); 1177996a778SMike Christie void (*cleanup_cmd_task) (struct iscsi_conn *conn, 1187996a778SMike Christie struct iscsi_cmd_task *ctask); 1197996a778SMike Christie int (*xmit_mgmt_task) (struct iscsi_conn *conn, 1207996a778SMike Christie struct iscsi_mgmt_task *mtask); 12130a6c652SMike Christie void (*session_recovery_timedout) (struct iscsi_cls_session *session); 1221da177e4SLinus Torvalds }; 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds /* 12539e84790SAlex Aizman * transport registration upcalls 1261da177e4SLinus Torvalds */ 1277b8631b5SMike Christie extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt); 12839e84790SAlex Aizman extern int iscsi_unregister_transport(struct iscsi_transport *tt); 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvalds /* 13139e84790SAlex Aizman * control plane upcalls 1321da177e4SLinus Torvalds */ 1337b7232f3SMike Christie extern void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error); 1347b7232f3SMike Christie extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, 13539e84790SAlex Aizman char *data, uint32_t data_size); 1361da177e4SLinus Torvalds 1377996a778SMike Christie 1387996a778SMike Christie /* Connection's states */ 1397996a778SMike Christie #define ISCSI_CONN_INITIAL_STAGE 0 1407996a778SMike Christie #define ISCSI_CONN_STARTED 1 1417996a778SMike Christie #define ISCSI_CONN_STOPPED 2 1427996a778SMike Christie #define ISCSI_CONN_CLEANUP_WAIT 3 1437996a778SMike Christie 1447b8631b5SMike Christie struct iscsi_cls_conn { 1457b8631b5SMike Christie struct list_head conn_list; /* item in connlist */ 1467b8631b5SMike Christie void *dd_data; /* LLD private data */ 1477b8631b5SMike Christie struct iscsi_transport *transport; 148b5c7a12dSMike Christie uint32_t cid; /* connection id */ 149fd7255f5SMike Christie 150fd7255f5SMike Christie /* portal/group values we got during discovery */ 151fd7255f5SMike Christie char *persistent_address; 152fd7255f5SMike Christie int persistent_port; 153fd7255f5SMike Christie /* portal/group values we are currently using */ 154fd7255f5SMike Christie char *address; 155fd7255f5SMike Christie int port; 156fd7255f5SMike Christie 1577b8631b5SMike Christie int active; /* must be accessed with the connlock */ 1587b8631b5SMike Christie struct device dev; /* sysfs transport/container device */ 1597b8631b5SMike Christie struct mempool_zone *z_error; 1607b8631b5SMike Christie struct mempool_zone *z_pdu; 1617b8631b5SMike Christie struct list_head freequeue; 1627b8631b5SMike Christie }; 1637b8631b5SMike Christie 1647b8631b5SMike Christie #define iscsi_dev_to_conn(_dev) \ 1657b8631b5SMike Christie container_of(_dev, struct iscsi_cls_conn, dev) 1667b8631b5SMike Christie 1677996a778SMike Christie /* Session's states */ 1687996a778SMike Christie #define ISCSI_STATE_FREE 1 1697996a778SMike Christie #define ISCSI_STATE_LOGGED_IN 2 1707996a778SMike Christie #define ISCSI_STATE_FAILED 3 1717996a778SMike Christie #define ISCSI_STATE_TERMINATE 4 1727996a778SMike Christie 1737b8631b5SMike Christie struct iscsi_cls_session { 1747b7232f3SMike Christie struct list_head sess_list; /* item in session_list */ 17530a6c652SMike Christie struct list_head host_list; 1767b8631b5SMike Christie struct iscsi_transport *transport; 177fd7255f5SMike Christie 178fd7255f5SMike Christie /* iSCSI values used as unique id by userspace. */ 179fd7255f5SMike Christie char *targetname; 180fd7255f5SMike Christie int tpgt; 181fd7255f5SMike Christie 18230a6c652SMike Christie /* recovery fields */ 18330a6c652SMike Christie int recovery_tmo; 18430a6c652SMike Christie struct work_struct recovery_work; 18530a6c652SMike Christie 18630a6c652SMike Christie int target_id; 18730a6c652SMike Christie int channel; 18830a6c652SMike Christie 189b5c7a12dSMike Christie int sid; /* session id */ 190b5c7a12dSMike Christie void *dd_data; /* LLD private data */ 1917b8631b5SMike Christie struct device dev; /* sysfs transport/container device */ 1927b8631b5SMike Christie }; 1937b8631b5SMike Christie 1947b8631b5SMike Christie #define iscsi_dev_to_session(_dev) \ 1957b8631b5SMike Christie container_of(_dev, struct iscsi_cls_session, dev) 1967b8631b5SMike Christie 1977b8631b5SMike Christie #define iscsi_session_to_shost(_session) \ 1987b8631b5SMike Christie dev_to_shost(_session->dev.parent) 1997b8631b5SMike Christie 20030a6c652SMike Christie struct iscsi_host { 20130a6c652SMike Christie int next_target_id; 20230a6c652SMike Christie struct list_head sessions; 20330a6c652SMike Christie struct mutex mutex; 20430a6c652SMike Christie }; 20530a6c652SMike Christie 2067b8631b5SMike Christie /* 2077b8631b5SMike Christie * session and connection functions that can be used by HW iSCSI LLDs 2087b8631b5SMike Christie */ 2097b8631b5SMike Christie extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, 21030a6c652SMike Christie struct iscsi_transport *t, int channel); 2117b8631b5SMike Christie extern int iscsi_destroy_session(struct iscsi_cls_session *session); 2127b8631b5SMike Christie extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, 2137b8631b5SMike Christie uint32_t cid); 2147b8631b5SMike Christie extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); 21530a6c652SMike Christie extern void iscsi_unblock_session(struct iscsi_cls_session *session); 21630a6c652SMike Christie extern void iscsi_block_session(struct iscsi_cls_session *session); 2177b8631b5SMike Christie 2181da177e4SLinus Torvalds #endif 219