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; 407b8631b5SMike Christie 4139e84790SAlex Aizman /** 4239e84790SAlex Aizman * struct iscsi_transport - iSCSI Transport template 4339e84790SAlex Aizman * 4439e84790SAlex Aizman * @name: transport name 4539e84790SAlex Aizman * @caps: iSCSI Data-Path capabilities 4639e84790SAlex Aizman * @create_session: create new iSCSI session object 4739e84790SAlex Aizman * @destroy_session: destroy existing iSCSI session object 4839e84790SAlex Aizman * @create_conn: create new iSCSI connection 4939e84790SAlex Aizman * @bind_conn: associate this connection with existing iSCSI session 5039e84790SAlex Aizman * and specified transport descriptor 5139e84790SAlex Aizman * @destroy_conn: destroy inactive iSCSI connection 52a54a52caSMike Christie * @set_param: set iSCSI parameter. Return 0 on success, -ENODATA 53a54a52caSMike Christie * when param is not supported, and a -Exx value on other 54a54a52caSMike Christie * error. 55a54a52caSMike Christie * @get_param get iSCSI parameter. Must return number of bytes 56a54a52caSMike Christie * copied to buffer on success, -ENODATA when param 57a54a52caSMike Christie * is not supported, and a -Exx value on other error 5839e84790SAlex Aizman * @start_conn: set connection to be operational 5939e84790SAlex Aizman * @stop_conn: suspend/recover/terminate connection 6039e84790SAlex Aizman * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text. 617996a778SMike Christie * @session_recovery_timedout: notify LLD a block during recovery timed out 623e5c28adSMike Christie * @init_task: Initialize a iscsi_task and any internal structs. 633e5c28adSMike Christie * When offloading the data path, this is called from 643e5c28adSMike Christie * queuecommand with the session lock, or from the 653e5c28adSMike Christie * iscsi_conn_send_pdu context with the session lock. 663e5c28adSMike Christie * When not offloading the data path, this is called 673e5c28adSMike Christie * from the scsi work queue without the session lock. 683e5c28adSMike Christie * @xmit_task Requests LLD to transfer cmd task. Returns 0 or the 693219e529SMike Christie * the number of bytes transferred on success, and -Exyz 703e5c28adSMike Christie * value on error. When offloading the data path, this 713e5c28adSMike Christie * is called from queuecommand with the session lock, or 723e5c28adSMike Christie * from the iscsi_conn_send_pdu context with the session 733e5c28adSMike Christie * lock. When not offloading the data path, this is called 743e5c28adSMike Christie * from the scsi work queue without the session lock. 753e5c28adSMike Christie * @cleanup_task: requests LLD to fail task. Called with session lock 763e5c28adSMike Christie * and after the connection has been suspended and 773e5c28adSMike Christie * terminated during recovery. If called 787996a778SMike Christie * from abort task then connection is not suspended 797996a778SMike Christie * or terminated but sk_callback_lock is held 8039e84790SAlex Aizman * 8139e84790SAlex Aizman * Template API provided by iSCSI Transport 8239e84790SAlex Aizman */ 8339e84790SAlex Aizman struct iscsi_transport { 8439e84790SAlex Aizman struct module *owner; 8539e84790SAlex Aizman char *name; 8639e84790SAlex Aizman unsigned int caps; 87fd7255f5SMike Christie /* LLD sets this to indicate what values it can export to sysfs */ 881819dc81SMike Christie uint64_t param_mask; 891819dc81SMike Christie uint64_t host_param_mask; 90d82ff9beSMike Christie struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep, 9175613521SMike Christie uint16_t cmds_max, uint16_t qdepth, 925e7facb7SMike Christie uint32_t sn); 937b7232f3SMike Christie void (*destroy_session) (struct iscsi_cls_session *session); 947b7232f3SMike Christie struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess, 957b8631b5SMike Christie uint32_t cid); 967b7232f3SMike Christie int (*bind_conn) (struct iscsi_cls_session *session, 977b7232f3SMike Christie struct iscsi_cls_conn *cls_conn, 98264faaaaSOr Gerlitz uint64_t transport_eph, int is_leading); 997b7232f3SMike Christie int (*start_conn) (struct iscsi_cls_conn *conn); 1007b7232f3SMike Christie void (*stop_conn) (struct iscsi_cls_conn *conn, int flag); 1017b8631b5SMike Christie void (*destroy_conn) (struct iscsi_cls_conn *conn); 1027b7232f3SMike Christie int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param, 103a54a52caSMike Christie char *buf, int buflen); 1047b7232f3SMike Christie int (*get_conn_param) (struct iscsi_cls_conn *conn, 105fd7255f5SMike Christie enum iscsi_param param, char *buf); 106a54a52caSMike Christie int (*get_session_param) (struct iscsi_cls_session *session, 107fd7255f5SMike Christie enum iscsi_param param, char *buf); 1081819dc81SMike Christie int (*get_host_param) (struct Scsi_Host *shost, 1091819dc81SMike Christie enum iscsi_host_param param, char *buf); 1101d9bf13aSMike Christie int (*set_host_param) (struct Scsi_Host *shost, 1111d9bf13aSMike Christie enum iscsi_host_param param, char *buf, 1121d9bf13aSMike Christie int buflen); 1137b7232f3SMike Christie int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, 11439e84790SAlex Aizman char *data, uint32_t data_size); 1157b7232f3SMike Christie void (*get_stats) (struct iscsi_cls_conn *conn, 1167b7232f3SMike Christie struct iscsi_stats *stats); 117577577daSMike Christie 1189c19a7d0SMike Christie int (*init_task) (struct iscsi_task *task); 1199c19a7d0SMike Christie int (*xmit_task) (struct iscsi_task *task); 120577577daSMike Christie void (*cleanup_task) (struct iscsi_task *task); 121577577daSMike Christie 1222ff79d52SMike Christie int (*alloc_pdu) (struct iscsi_task *task, uint8_t opcode); 123577577daSMike Christie int (*xmit_pdu) (struct iscsi_task *task); 124577577daSMike Christie int (*init_pdu) (struct iscsi_task *task, unsigned int offset, 125577577daSMike Christie unsigned int count); 126262ef636SMike Christie void (*parse_pdu_itt) (struct iscsi_conn *conn, itt_t itt, 127262ef636SMike Christie int *index, int *age); 128262ef636SMike Christie 12930a6c652SMike Christie void (*session_recovery_timedout) (struct iscsi_cls_session *session); 13010eb0f01SMike Christie struct iscsi_endpoint *(*ep_connect) (struct Scsi_Host *shost, 13110eb0f01SMike Christie struct sockaddr *dst_addr, 132d82ff9beSMike Christie int non_blocking); 133d82ff9beSMike Christie int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms); 134d82ff9beSMike Christie void (*ep_disconnect) (struct iscsi_endpoint *ep); 1352174a04eSMike Christie int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type, 13601cb225dSMike Christie uint32_t enable, struct sockaddr *dst_addr); 13743514774SMichael Chan int (*set_path) (struct Scsi_Host *shost, struct iscsi_path *params); 1381da177e4SLinus Torvalds }; 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds /* 14139e84790SAlex Aizman * transport registration upcalls 1421da177e4SLinus Torvalds */ 1437b8631b5SMike Christie extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt); 14439e84790SAlex Aizman extern int iscsi_unregister_transport(struct iscsi_transport *tt); 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds /* 14739e84790SAlex Aizman * control plane upcalls 1481da177e4SLinus Torvalds */ 149e5bd7b54SMike Christie extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn, 150e5bd7b54SMike Christie enum iscsi_err error); 1517b7232f3SMike Christie extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, 15239e84790SAlex Aizman char *data, uint32_t data_size); 1531da177e4SLinus Torvalds 15443514774SMichael Chan extern int iscsi_offload_mesg(struct Scsi_Host *shost, 15543514774SMichael Chan struct iscsi_transport *transport, uint32_t type, 15643514774SMichael Chan char *data, uint16_t data_size); 15743514774SMichael Chan 1587b8631b5SMike Christie struct iscsi_cls_conn { 1597b8631b5SMike Christie struct list_head conn_list; /* item in connlist */ 1607b8631b5SMike Christie void *dd_data; /* LLD private data */ 1617b8631b5SMike Christie struct iscsi_transport *transport; 162b5c7a12dSMike Christie uint32_t cid; /* connection id */ 163fd7255f5SMike Christie 1647b8631b5SMike Christie int active; /* must be accessed with the connlock */ 1657b8631b5SMike Christie struct device dev; /* sysfs transport/container device */ 1667b8631b5SMike Christie }; 1677b8631b5SMike Christie 1687b8631b5SMike Christie #define iscsi_dev_to_conn(_dev) \ 1697b8631b5SMike Christie container_of(_dev, struct iscsi_cls_conn, dev) 1707b8631b5SMike Christie 1716eabafbeSMike Christie #define iscsi_conn_to_session(_conn) \ 1726eabafbeSMike Christie iscsi_dev_to_session(_conn->dev.parent) 1736eabafbeSMike Christie 1746eabafbeSMike Christie /* iscsi class session state */ 1756eabafbeSMike Christie enum { 1766eabafbeSMike Christie ISCSI_SESSION_LOGGED_IN, 1776eabafbeSMike Christie ISCSI_SESSION_FAILED, 1786eabafbeSMike Christie ISCSI_SESSION_FREE, 1796eabafbeSMike Christie }; 1807996a778SMike Christie 1817970634bSMike Christie #define ISCSI_MAX_TARGET -1 1827970634bSMike Christie 1837b8631b5SMike Christie struct iscsi_cls_session { 1847b7232f3SMike Christie struct list_head sess_list; /* item in session_list */ 1857b8631b5SMike Christie struct iscsi_transport *transport; 1866eabafbeSMike Christie spinlock_t lock; 18745ab33b6SMike Christie struct work_struct block_work; 18845ab33b6SMike Christie struct work_struct unblock_work; 189bd976f62SMike Christie struct work_struct scan_work; 190bd976f62SMike Christie struct work_struct unbind_work; 191fd7255f5SMike Christie 19230a6c652SMike Christie /* recovery fields */ 19330a6c652SMike Christie int recovery_tmo; 194c4028958SDavid Howells struct delayed_work recovery_work; 19530a6c652SMike Christie 1967970634bSMike Christie unsigned int target_id; 19730a6c652SMike Christie 1986eabafbeSMike Christie int state; 199b5c7a12dSMike Christie int sid; /* session id */ 200b5c7a12dSMike Christie void *dd_data; /* LLD private data */ 2017b8631b5SMike Christie struct device dev; /* sysfs transport/container device */ 2027b8631b5SMike Christie }; 2037b8631b5SMike Christie 2047b8631b5SMike Christie #define iscsi_dev_to_session(_dev) \ 2057b8631b5SMike Christie container_of(_dev, struct iscsi_cls_session, dev) 2067b8631b5SMike Christie 2077b8631b5SMike Christie #define iscsi_session_to_shost(_session) \ 2087b8631b5SMike Christie dev_to_shost(_session->dev.parent) 2097b8631b5SMike Christie 2108434aa8bSMike Christie #define starget_to_session(_stgt) \ 2118434aa8bSMike Christie iscsi_dev_to_session(_stgt->dev.parent) 2128434aa8bSMike Christie 21332c6e1b9SMike Christie struct iscsi_cls_host { 2148aae18adSMike Christie atomic_t nr_scans; 21530a6c652SMike Christie struct mutex mutex; 21630a6c652SMike Christie }; 21730a6c652SMike Christie 218a4804cd6SMike Christie extern void iscsi_host_for_each_session(struct Scsi_Host *shost, 219a4804cd6SMike Christie void (*fn)(struct iscsi_cls_session *)); 220a4804cd6SMike Christie 221d82ff9beSMike Christie struct iscsi_endpoint { 222d82ff9beSMike Christie void *dd_data; /* LLD private data */ 223d82ff9beSMike Christie struct device dev; 22421536062SMike Christie uint64_t id; 225d82ff9beSMike Christie }; 226a4804cd6SMike Christie 2277b8631b5SMike Christie /* 2287b8631b5SMike Christie * session and connection functions that can be used by HW iSCSI LLDs 2297b8631b5SMike Christie */ 230322d739dSMike Christie #define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \ 231322d739dSMike Christie dev_printk(prefix, &(_cls_session)->dev, fmt, ##a) 232322d739dSMike Christie 233322d739dSMike Christie #define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \ 234322d739dSMike Christie dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a) 235322d739dSMike Christie 2366eabafbeSMike Christie extern int iscsi_session_chkready(struct iscsi_cls_session *session); 2378434aa8bSMike Christie extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost, 2385d91e209SMike Christie struct iscsi_transport *transport, int dd_size); 2396a8a0d36SMike Christie extern int iscsi_add_session(struct iscsi_cls_session *session, 2406a8a0d36SMike Christie unsigned int target_id); 24126974789SMike Christie extern int iscsi_session_event(struct iscsi_cls_session *session, 24226974789SMike Christie enum iscsi_uevent_e event); 2437b8631b5SMike Christie extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, 2446a8a0d36SMike Christie struct iscsi_transport *t, 2455d91e209SMike Christie int dd_size, 2466a8a0d36SMike Christie unsigned int target_id); 2478434aa8bSMike Christie extern void iscsi_remove_session(struct iscsi_cls_session *session); 2488434aa8bSMike Christie extern void iscsi_free_session(struct iscsi_cls_session *session); 2497b8631b5SMike Christie extern int iscsi_destroy_session(struct iscsi_cls_session *session); 2507b8631b5SMike Christie extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, 2515d91e209SMike Christie int dd_size, uint32_t cid); 2527b8631b5SMike Christie extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); 25330a6c652SMike Christie extern void iscsi_unblock_session(struct iscsi_cls_session *session); 25430a6c652SMike Christie extern void iscsi_block_session(struct iscsi_cls_session *session); 2558aae18adSMike Christie extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time); 256d82ff9beSMike Christie extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size); 257d82ff9beSMike Christie extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep); 258d82ff9beSMike Christie extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle); 259c01be6dcSMike Christie extern int iscsi_block_scsi_eh(struct scsi_cmnd *cmd); 26053cb8a1fSMike Christie 2611da177e4SLinus Torvalds #endif 262