| /* |
| * 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, struct Scsi_Host *shost, |
| uint16_t cmds_max, uint16_t qdepth, 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 block_work; |
| struct work_struct unblock_work; |
| 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 |
| */ |
| #define iscsi_cls_session_printk(prefix, _cls_session, fmt, a...) \ |
| dev_printk(prefix, &(_cls_session)->dev, fmt, ##a) |
| |
| #define iscsi_cls_conn_printk(prefix, _cls_conn, fmt, a...) \ |
| dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a) |
| |
| 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 |