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> 27d773c082SMichael S. Tsirkin #include <linux/list.h> 28d773c082SMichael S. Tsirkin #include <linux/mutex.h> 2939e84790SAlex Aizman #include <scsi/iscsi_if.h> 301da177e4SLinus Torvalds 317b8631b5SMike Christie struct scsi_transport_template; 327996a778SMike Christie struct iscsi_transport; 33d82ff9beSMike Christie struct iscsi_endpoint; 347b8631b5SMike Christie struct Scsi_Host; 35c01be6dcSMike Christie struct scsi_cmnd; 367b8631b5SMike Christie struct iscsi_cls_conn; 377996a778SMike Christie struct iscsi_conn; 389c19a7d0SMike Christie struct iscsi_task; 39a54a52caSMike Christie struct sockaddr; 408d07913dSMike Christie struct iscsi_iface; 417b8631b5SMike Christie 4239e84790SAlex Aizman /** 4339e84790SAlex Aizman * struct iscsi_transport - iSCSI Transport template 4439e84790SAlex Aizman * 4539e84790SAlex Aizman * @name: transport name 4639e84790SAlex Aizman * @caps: iSCSI Data-Path capabilities 4739e84790SAlex Aizman * @create_session: create new iSCSI session object 4839e84790SAlex Aizman * @destroy_session: destroy existing iSCSI session object 4939e84790SAlex Aizman * @create_conn: create new iSCSI connection 5039e84790SAlex Aizman * @bind_conn: associate this connection with existing iSCSI session 5139e84790SAlex Aizman * and specified transport descriptor 5239e84790SAlex Aizman * @destroy_conn: destroy inactive iSCSI connection 53a54a52caSMike Christie * @set_param: set iSCSI parameter. Return 0 on success, -ENODATA 54a54a52caSMike Christie * when param is not supported, and a -Exx value on other 55a54a52caSMike Christie * error. 56a54a52caSMike Christie * @get_param get iSCSI parameter. Must return number of bytes 57a54a52caSMike Christie * copied to buffer on success, -ENODATA when param 58a54a52caSMike Christie * is not supported, and a -Exx value on other error 5939e84790SAlex Aizman * @start_conn: set connection to be operational 6039e84790SAlex Aizman * @stop_conn: suspend/recover/terminate connection 6139e84790SAlex Aizman * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text. 627996a778SMike Christie * @session_recovery_timedout: notify LLD a block during recovery timed out 633e5c28adSMike Christie * @init_task: Initialize a iscsi_task and any internal structs. 643e5c28adSMike Christie * When offloading the data path, this is called from 653e5c28adSMike Christie * queuecommand with the session lock, or from the 663e5c28adSMike Christie * iscsi_conn_send_pdu context with the session lock. 673e5c28adSMike Christie * When not offloading the data path, this is called 683e5c28adSMike Christie * from the scsi work queue without the session lock. 693e5c28adSMike Christie * @xmit_task Requests LLD to transfer cmd task. Returns 0 or the 703219e529SMike Christie * the number of bytes transferred on success, and -Exyz 713e5c28adSMike Christie * value on error. When offloading the data path, this 723e5c28adSMike Christie * is called from queuecommand with the session lock, or 733e5c28adSMike Christie * from the iscsi_conn_send_pdu context with the session 743e5c28adSMike Christie * lock. When not offloading the data path, this is called 753e5c28adSMike Christie * from the scsi work queue without the session lock. 763e5c28adSMike Christie * @cleanup_task: requests LLD to fail task. Called with session lock 773e5c28adSMike Christie * and after the connection has been suspended and 783e5c28adSMike Christie * terminated during recovery. If called 797996a778SMike Christie * from abort task then connection is not suspended 807996a778SMike Christie * or terminated but sk_callback_lock is held 8139e84790SAlex Aizman * 8239e84790SAlex Aizman * Template API provided by iSCSI Transport 8339e84790SAlex Aizman */ 8439e84790SAlex Aizman struct iscsi_transport { 8539e84790SAlex Aizman struct module *owner; 8639e84790SAlex Aizman char *name; 8739e84790SAlex Aizman unsigned int caps; 88fd7255f5SMike Christie /* LLD sets this to indicate what values it can export to sysfs */ 891819dc81SMike Christie uint64_t param_mask; 901819dc81SMike Christie uint64_t host_param_mask; 918d07913dSMike Christie uint64_t iface_param_mask; 928d07913dSMike Christie 93d82ff9beSMike Christie struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep, 9475613521SMike Christie uint16_t cmds_max, uint16_t qdepth, 955e7facb7SMike Christie uint32_t sn); 967b7232f3SMike Christie void (*destroy_session) (struct iscsi_cls_session *session); 977b7232f3SMike Christie struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess, 987b8631b5SMike Christie uint32_t cid); 997b7232f3SMike Christie int (*bind_conn) (struct iscsi_cls_session *session, 1007b7232f3SMike Christie struct iscsi_cls_conn *cls_conn, 101264faaaaSOr Gerlitz uint64_t transport_eph, int is_leading); 1027b7232f3SMike Christie int (*start_conn) (struct iscsi_cls_conn *conn); 1037b7232f3SMike Christie void (*stop_conn) (struct iscsi_cls_conn *conn, int flag); 1047b8631b5SMike Christie void (*destroy_conn) (struct iscsi_cls_conn *conn); 1057b7232f3SMike Christie int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param, 106a54a52caSMike Christie char *buf, int buflen); 107289324b0SMike Christie int (*get_ep_param) (struct iscsi_endpoint *ep, enum iscsi_param param, 108289324b0SMike Christie char *buf); 1097b7232f3SMike Christie int (*get_conn_param) (struct iscsi_cls_conn *conn, 110fd7255f5SMike Christie enum iscsi_param param, char *buf); 111a54a52caSMike Christie int (*get_session_param) (struct iscsi_cls_session *session, 112fd7255f5SMike Christie enum iscsi_param param, char *buf); 1131819dc81SMike Christie int (*get_host_param) (struct Scsi_Host *shost, 1141819dc81SMike Christie enum iscsi_host_param param, char *buf); 1151d9bf13aSMike Christie int (*set_host_param) (struct Scsi_Host *shost, 1161d9bf13aSMike Christie enum iscsi_host_param param, char *buf, 1171d9bf13aSMike Christie int buflen); 1187b7232f3SMike Christie int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, 11939e84790SAlex Aizman char *data, uint32_t data_size); 1207b7232f3SMike Christie void (*get_stats) (struct iscsi_cls_conn *conn, 1217b7232f3SMike Christie struct iscsi_stats *stats); 122577577daSMike Christie 1239c19a7d0SMike Christie int (*init_task) (struct iscsi_task *task); 1249c19a7d0SMike Christie int (*xmit_task) (struct iscsi_task *task); 125577577daSMike Christie void (*cleanup_task) (struct iscsi_task *task); 126577577daSMike Christie 1272ff79d52SMike Christie int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode); 128577577daSMike Christie int (*xmit_pdu) (struct iscsi_task *task); 129577577daSMike Christie int (*init_pdu) (struct iscsi_task *task, unsigned int offset, 130577577daSMike Christie unsigned int count); 131262ef636SMike Christie void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt, 132262ef636SMike Christie int *index, int *age); 133262ef636SMike Christie 13430a6c652SMike Christie void (*session_recovery_timedout) (struct iscsi_cls_session *session); 13510eb0f01SMike Christie struct iscsi_endpoint *(*ep_connect) (struct Scsi_Host *shost, 13610eb0f01SMike Christie struct sockaddr *dst_addr, 137d82ff9beSMike Christie int non_blocking); 138d82ff9beSMike Christie int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms); 139d82ff9beSMike Christie void (*ep_disconnect) (struct iscsi_endpoint *ep); 1402174a04eSMike Christie int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type, 14101cb225dSMike Christie uint32_t enable, struct sockaddr *dst_addr); 14243514774SMichael Chan int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params); 14356c155b5SMike Christie int (*set_iface_param) (struct Scsi_Host *shost, char *data, int count); 1448d07913dSMike Christie int (*get_iface_param) (struct iscsi_iface *iface, 1458d07913dSMike Christie enum iscsi_param_type param_type, 1468d07913dSMike Christie int param, char *buf); 1471da177e4SLinus Torvalds }; 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds /* 15039e84790SAlex Aizman * transport registration upcalls 1511da177e4SLinus Torvalds */ 1527b8631b5SMike Christie extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt); 15339e84790SAlex Aizman extern int iscsi_unregister_transport(struct iscsi_transport *tt); 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds /* 15639e84790SAlex Aizman * control plane upcalls 1571da177e4SLinus Torvalds */ 158e5bd7b54SMike Christie extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn, 159e5bd7b54SMike Christie enum iscsi_err error); 1607b7232f3SMike Christie extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, 16139e84790SAlex Aizman char *data, uint32_t data_size); 1621da177e4SLinus Torvalds 16343514774SMichael Chan extern int iscsi_offload_mesg(struct Scsi_Host *shost, 16443514774SMichael Chan struct iscsi_transport *transport, uint32_t type, 16543514774SMichael Chan char *data, uint16_t data_size); 16643514774SMichael Chan 1677b8631b5SMike Christie struct iscsi_cls_conn { 1687b8631b5SMike Christie struct list_head conn_list; /* item in connlist */ 1697b8631b5SMike Christie void *dd_data; /* LLD private data */ 1707b8631b5SMike Christie struct iscsi_transport *transport; 171b5c7a12dSMike Christie uint32_t cid; /* connection id */ 17222a39fbbSMike Christie struct mutex ep_mutex; 17322a39fbbSMike Christie struct iscsi_endpoint *ep; 174fd7255f5SMike Christie 1757b8631b5SMike Christie struct device dev; /* sysfs transport/container device */ 1767b8631b5SMike Christie }; 1777b8631b5SMike Christie 1787b8631b5SMike Christie #define iscsi_dev_to_conn(_dev) \ 1797b8631b5SMike Christie container_of(_dev, struct iscsi_cls_conn, dev) 1807b8631b5SMike Christie 1816eabafbeSMike Christie #define iscsi_conn_to_session(_conn) \ 1826eabafbeSMike Christie iscsi_dev_to_session(_conn->dev.parent) 1836eabafbeSMike Christie 1846eabafbeSMike Christie /* iscsi class session state */ 1856eabafbeSMike Christie enum { 1866eabafbeSMike Christie ISCSI_SESSION_LOGGED_IN, 1876eabafbeSMike Christie ISCSI_SESSION_FAILED, 1886eabafbeSMike Christie ISCSI_SESSION_FREE, 1896eabafbeSMike Christie }; 1907996a778SMike Christie 1917970634bSMike Christie #define ISCSI_MAX_TARGET -1 1927970634bSMike Christie 1937b8631b5SMike Christie struct iscsi_cls_session { 1947b7232f3SMike Christie struct list_head sess_list; /* item in session_list */ 1957b8631b5SMike Christie struct iscsi_transport *transport; 1966eabafbeSMike Christie spinlock_t lock; 19745ab33b6SMike Christie struct work_struct block_work; 19845ab33b6SMike Christie struct work_struct unblock_work; 199bd976f62SMike Christie struct work_struct scan_work; 200bd976f62SMike Christie struct work_struct unbind_work; 201fd7255f5SMike Christie 20230a6c652SMike Christie /* recovery fields */ 20330a6c652SMike Christie int recovery_tmo; 204c4028958SDavid Howells struct delayed_work recovery_work; 20530a6c652SMike Christie 2067970634bSMike Christie unsigned int target_id; 20730a6c652SMike Christie 2086eabafbeSMike Christie int state; 209b5c7a12dSMike Christie int sid; /* session id */ 210b5c7a12dSMike Christie void *dd_data; /* LLD private data */ 2117b8631b5SMike Christie struct device dev; /* sysfs transport/container device */ 2127b8631b5SMike Christie }; 2137b8631b5SMike Christie 2147b8631b5SMike Christie #define iscsi_dev_to_session(_dev) \ 2157b8631b5SMike Christie container_of(_dev, struct iscsi_cls_session, dev) 2167b8631b5SMike Christie 2177b8631b5SMike Christie #define iscsi_session_to_shost(_session) \ 2187b8631b5SMike Christie dev_to_shost(_session->dev.parent) 2197b8631b5SMike Christie 2208434aa8bSMike Christie #define starget_to_session(_stgt) \ 2218434aa8bSMike Christie iscsi_dev_to_session(_stgt->dev.parent) 2228434aa8bSMike Christie 22332c6e1b9SMike Christie struct iscsi_cls_host { 2248aae18adSMike Christie atomic_t nr_scans; 22530a6c652SMike Christie struct mutex mutex; 22630a6c652SMike Christie }; 22730a6c652SMike Christie 228a4804cd6SMike Christie extern void iscsi_host_for_each_session(struct Scsi_Host *shost, 229a4804cd6SMike Christie void (*fn)(struct iscsi_cls_session *)); 230a4804cd6SMike Christie 231d82ff9beSMike Christie struct iscsi_endpoint { 232d82ff9beSMike Christie void *dd_data; /* LLD private data */ 233d82ff9beSMike Christie struct device dev; 23421536062SMike Christie uint64_t id; 23522a39fbbSMike Christie struct iscsi_cls_conn *conn; 236d82ff9beSMike Christie }; 237a4804cd6SMike Christie 2388d07913dSMike Christie struct iscsi_iface { 2398d07913dSMike Christie struct device dev; 2408d07913dSMike Christie struct iscsi_transport *transport; 2418d07913dSMike Christie uint32_t iface_type; /* IPv4 or IPv6 */ 2428d07913dSMike Christie uint32_t iface_num; /* iface number, 0 - n */ 2438d07913dSMike Christie void *dd_data; /* LLD private data */ 2448d07913dSMike Christie }; 2458d07913dSMike Christie 2468d07913dSMike Christie #define iscsi_dev_to_iface(_dev) \ 2478d07913dSMike Christie container_of(_dev, struct iscsi_iface, dev) 2488d07913dSMike Christie 2498d07913dSMike Christie #define iscsi_iface_to_shost(_iface) \ 2508d07913dSMike Christie dev_to_shost(_iface->dev.parent) 2518d07913dSMike Christie 2527b8631b5SMike Christie /* 2537b8631b5SMike Christie * session and connection functions that can be used by HW iSCSI LLDs 2547b8631b5SMike Christie */ 255322d739dSMike Christie #define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \ 256322d739dSMike Christie dev_printk(prefix, &(_cls_session)->dev, fmt, ##a) 257322d739dSMike Christie 258322d739dSMike Christie #define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \ 259322d739dSMike Christie dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a) 260322d739dSMike Christie 2616eabafbeSMike Christie extern int iscsi_session_chkready(struct iscsi_cls_session *session); 2628434aa8bSMike Christie extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost, 2635d91e209SMike Christie struct iscsi_transport *transport, int dd_size); 2646a8a0d36SMike Christie extern int iscsi_add_session(struct iscsi_cls_session *session, 2656a8a0d36SMike Christie unsigned int target_id); 26626974789SMike Christie extern int iscsi_session_event(struct iscsi_cls_session *session, 26726974789SMike Christie enum iscsi_uevent_e event); 2687b8631b5SMike Christie extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, 2696a8a0d36SMike Christie struct iscsi_transport *t, 2705d91e209SMike Christie int dd_size, 2716a8a0d36SMike Christie unsigned int target_id); 2728434aa8bSMike Christie extern void iscsi_remove_session(struct iscsi_cls_session *session); 2738434aa8bSMike Christie extern void iscsi_free_session(struct iscsi_cls_session *session); 2747b8631b5SMike Christie extern int iscsi_destroy_session(struct iscsi_cls_session *session); 2757b8631b5SMike Christie extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, 2765d91e209SMike Christie int dd_size, uint32_t cid); 2777b8631b5SMike Christie extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); 27830a6c652SMike Christie extern void iscsi_unblock_session(struct iscsi_cls_session *session); 27930a6c652SMike Christie extern void iscsi_block_session(struct iscsi_cls_session *session); 2808aae18adSMike Christie extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time); 281d82ff9beSMike Christie extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size); 282d82ff9beSMike Christie extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep); 283d82ff9beSMike Christie extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle); 284c01be6dcSMike Christie extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd); 2858d07913dSMike Christie extern struct iscsi_iface *iscsi_create_iface(struct Scsi_Host *shost, 2868d07913dSMike Christie struct iscsi_transport *t, 2878d07913dSMike Christie uint32_t iface_type, 2888d07913dSMike Christie uint32_t iface_num, int dd_size); 2898d07913dSMike Christie extern void iscsi_destroy_iface(struct iscsi_iface *iface); 2908d07913dSMike Christie extern struct iscsi_iface *iscsi_lookup_iface(int handle); 29153cb8a1fSMike Christie 2921da177e4SLinus Torvalds #endif 293