/* * iSCSI transport class definitions * * Copyright (C) IBM Corporation, 2004 * Copyright (C) Mike Christie, 2004 - 2006 * Copyright (C) Dmitry Yusupov, 2004 - 2005 * Copyright (C) Alex Aizman, 2004 - 2005 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef SCSI_TRANSPORT_ISCSI_H #define SCSI_TRANSPORT_ISCSI_H #include <linux/device.h> #include <linux/list.h> #include <linux/mutex.h> #include <scsi/iscsi_if.h> struct scsi_transport_template; struct iscsi_transport; struct Scsi_Host; struct iscsi_cls_conn; struct iscsi_conn; struct iscsi_cmd_task; struct iscsi_mgmt_task; struct sockaddr; /** * struct iscsi_transport - iSCSI Transport template * * @name: transport name * @caps: iSCSI Data-Path capabilities * @create_session: create new iSCSI session object * @destroy_session: destroy existing iSCSI session object * @create_conn: create new iSCSI connection * @bind_conn: associate this connection with existing iSCSI session * and specified transport descriptor * @destroy_conn: destroy inactive iSCSI connection * @set_param: set iSCSI parameter. Return 0 on success, -ENODATA * when param is not supported, and a -Exx value on other * error. * @get_param get iSCSI parameter. Must return number of bytes * copied to buffer on success, -ENODATA when param * is not supported, and a -Exx value on other error * @start_conn: set connection to be operational * @stop_conn: suspend/recover/terminate connection * @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text. * @session_recovery_timedout: notify LLD a block during recovery timed out * @init_cmd_task: Initialize a iscsi_cmd_task and any internal structs. * Called from queuecommand with session lock held. * @init_mgmt_task: Initialize a iscsi_mgmt_task and any internal structs. * Called from iscsi_conn_send_generic with xmitmutex. * @xmit_cmd_task: Requests LLD to transfer cmd task. Returns 0 or the * the number of bytes transferred on success, and -Exyz * value on error. * @xmit_mgmt_task: Requests LLD to transfer mgmt task. Returns 0 or the * the number of bytes transferred on success, and -Exyz * value on error. * @cleanup_cmd_task: requests LLD to fail cmd task. Called with xmitmutex * and session->lock after the connection has been * suspended and terminated during recovery. If called * from abort task then connection is not suspended * or terminated but sk_callback_lock is held * * Template API provided by iSCSI Transport */ struct iscsi_transport { struct module *owner; char *name; unsigned int caps; /* LLD sets this to indicate what values it can export to sysfs */ uint64_t param_mask; uint64_t host_param_mask; struct scsi_host_template *host_template; /* LLD connection data size */ int conndata_size; /* LLD session data size */ int sessiondata_size; int max_lun; unsigned int max_conn; unsigned int max_cmd_len; struct iscsi_cls_session *(*create_session) (struct iscsi_transport *it, struct scsi_transport_template *t, uint16_t, uint16_t, uint32_t sn, uint32_t *hn); void (*destroy_session) (struct iscsi_cls_session *session); struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess, uint32_t cid); int (*bind_conn) (struct iscsi_cls_session *session, struct iscsi_cls_conn *cls_conn, uint64_t transport_eph, int is_leading); int (*start_conn) (struct iscsi_cls_conn *conn); void (*stop_conn) (struct iscsi_cls_conn *conn, int flag); void (*destroy_conn) (struct iscsi_cls_conn *conn); int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param, char *buf, int buflen); int (*get_conn_param) (struct iscsi_cls_conn *conn, enum iscsi_param param, char *buf); int (*get_session_param) (struct iscsi_cls_session *session, enum iscsi_param param, char *buf); int (*get_host_param) (struct Scsi_Host *shost, enum iscsi_host_param param, char *buf); int (*set_host_param) (struct Scsi_Host *shost, enum iscsi_host_param param, char *buf, int buflen); int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, char *data, uint32_t data_size); void (*get_stats) (struct iscsi_cls_conn *conn, struct iscsi_stats *stats); int (*init_cmd_task) (struct iscsi_cmd_task *ctask); void (*init_mgmt_task) (struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask); int (*xmit_cmd_task) (struct iscsi_conn *conn, struct iscsi_cmd_task *ctask); void (*cleanup_cmd_task) (struct iscsi_conn *conn, struct iscsi_cmd_task *ctask); int (*xmit_mgmt_task) (struct iscsi_conn *conn, struct iscsi_mgmt_task *mtask); void (*session_recovery_timedout) (struct iscsi_cls_session *session); int (*ep_connect) (struct sockaddr *dst_addr, int non_blocking, uint64_t *ep_handle); int (*ep_poll) (uint64_t ep_handle, int timeout_ms); void (*ep_disconnect) (uint64_t ep_handle); int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type, uint32_t enable, struct sockaddr *dst_addr); }; /* * transport registration upcalls */ extern struct scsi_transport_template *iscsi_register_transport(struct iscsi_transport *tt); extern int iscsi_unregister_transport(struct iscsi_transport *tt); /* * control plane upcalls */ extern void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error); extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, char *data, uint32_t data_size); struct iscsi_cls_conn { struct list_head conn_list; /* item in connlist */ void *dd_data; /* LLD private data */ struct iscsi_transport *transport; uint32_t cid; /* connection id */ int active; /* must be accessed with the connlock */ struct device dev; /* sysfs transport/container device */ }; #define iscsi_dev_to_conn(_dev) \ container_of(_dev, struct iscsi_cls_conn, dev) #define iscsi_conn_to_session(_conn) \ iscsi_dev_to_session(_conn->dev.parent) /* iscsi class session state */ enum { ISCSI_SESSION_LOGGED_IN, ISCSI_SESSION_FAILED, ISCSI_SESSION_FREE, }; struct iscsi_cls_session { struct list_head sess_list; /* item in session_list */ struct list_head host_list; struct iscsi_transport *transport; spinlock_t lock; struct work_struct scan_work; struct work_struct unbind_work; /* recovery fields */ int recovery_tmo; struct delayed_work recovery_work; int target_id; int state; int sid; /* session id */ void *dd_data; /* LLD private data */ struct device dev; /* sysfs transport/container device */ }; #define iscsi_dev_to_session(_dev) \ container_of(_dev, struct iscsi_cls_session, dev) #define iscsi_session_to_shost(_session) \ dev_to_shost(_session->dev.parent) #define starget_to_session(_stgt) \ iscsi_dev_to_session(_stgt->dev.parent) struct iscsi_host { struct list_head sessions; atomic_t nr_scans; struct mutex mutex; struct workqueue_struct *scan_workq; char scan_workq_name[KOBJ_NAME_LEN]; }; /* * session and connection functions that can be used by HW iSCSI LLDs */ extern int iscsi_session_chkready(struct iscsi_cls_session *session); extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport); extern int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id); extern int iscsi_session_event(struct iscsi_cls_session *session, enum iscsi_uevent_e event); extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *t, unsigned int target_id); extern void iscsi_remove_session(struct iscsi_cls_session *session); extern void iscsi_free_session(struct iscsi_cls_session *session); extern int iscsi_destroy_session(struct iscsi_cls_session *session); extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess, uint32_t cid); extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn); extern void iscsi_unblock_session(struct iscsi_cls_session *session); extern void iscsi_block_session(struct iscsi_cls_session *session); extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time); #endif