| /* |
| * iSCSI lib definitions |
| * |
| * Copyright (C) 2006 Red Hat, Inc. All rights reserved. |
| * Copyright (C) 2004 - 2006 Mike Christie |
| * Copyright (C) 2004 - 2005 Dmitry Yusupov |
| * Copyright (C) 2004 - 2005 Alex Aizman |
| * |
| * 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 LIBISCSI_H |
| #define LIBISCSI_H |
| |
| #include <linux/types.h> |
| #include <linux/mutex.h> |
| #include <scsi/iscsi_proto.h> |
| #include <scsi/iscsi_if.h> |
| |
| struct scsi_transport_template; |
| struct scsi_device; |
| struct Scsi_Host; |
| struct scsi_cmnd; |
| struct socket; |
| struct iscsi_transport; |
| struct iscsi_cls_session; |
| struct iscsi_cls_conn; |
| struct iscsi_session; |
| struct iscsi_nopin; |
| |
| /* #define DEBUG_SCSI */ |
| #ifdef DEBUG_SCSI |
| #define debug_scsi(fmt...) printk(KERN_INFO "scsi: " fmt) |
| #else |
| #define debug_scsi(fmt...) |
| #endif |
| |
| #define ISCSI_XMIT_CMDS_MAX 128 /* must be power of 2 */ |
| #define ISCSI_MGMT_CMDS_MAX 32 /* must be power of 2 */ |
| #define ISCSI_CONN_MAX 1 |
| |
| #define ISCSI_MGMT_ITT_OFFSET 0xa00 |
| |
| #define ISCSI_DEF_CMD_PER_LUN 32 |
| #define ISCSI_MAX_CMD_PER_LUN 128 |
| |
| /* Task Mgmt states */ |
| #define TMABORT_INITIAL 0x0 |
| #define TMABORT_SUCCESS 0x1 |
| #define TMABORT_FAILED 0x2 |
| #define TMABORT_TIMEDOUT 0x3 |
| |
| /* Connection suspend "bit" */ |
| #define ISCSI_SUSPEND_BIT 1 |
| |
| #define ISCSI_ITT_MASK (0xfff) |
| #define ISCSI_CID_SHIFT 12 |
| #define ISCSI_CID_MASK (0xffff << ISCSI_CID_SHIFT) |
| #define ISCSI_AGE_SHIFT 28 |
| #define ISCSI_AGE_MASK (0xf << ISCSI_AGE_SHIFT) |
| |
| struct iscsi_mgmt_task { |
| /* |
| * Becuae LLDs allocate their hdr differently, this is a pointer to |
| * that storage. It must be setup at session creation time. |
| */ |
| struct iscsi_hdr *hdr; |
| char *data; /* mgmt payload */ |
| int data_count; /* counts data to be sent */ |
| uint32_t itt; /* this ITT */ |
| void *dd_data; /* driver/transport data */ |
| struct list_head running; |
| }; |
| |
| struct iscsi_cmd_task { |
| /* |
| * Becuae LLDs allocate their hdr differently, this is a pointer to |
| * that storage. It must be setup at session creation time. |
| */ |
| struct iscsi_cmd *hdr; |
| int itt; /* this ITT */ |
| int datasn; /* DataSN */ |
| |
| uint32_t unsol_datasn; |
| int imm_count; /* imm-data (bytes) */ |
| int unsol_count; /* unsolicited (bytes)*/ |
| int data_count; /* remaining Data-Out */ |
| struct scsi_cmnd *sc; /* associated SCSI cmd*/ |
| int total_length; |
| struct iscsi_conn *conn; /* used connection */ |
| struct iscsi_mgmt_task *mtask; /* tmf mtask in progr */ |
| |
| struct list_head running; /* running cmd list */ |
| void *dd_data; /* driver/transport data */ |
| }; |
| |
| struct iscsi_conn { |
| struct iscsi_cls_conn *cls_conn; /* ptr to class connection */ |
| void *dd_data; /* iscsi_transport data */ |
| struct iscsi_session *session; /* parent session */ |
| /* |
| * LLDs should set this lock. It protects the transport recv |
| * code |
| */ |
| rwlock_t *recv_lock; |
| /* |
| * conn_stop() flag: stop to recover, stop to terminate |
| */ |
| int stop_stage; |
| |
| /* iSCSI connection-wide sequencing */ |
| uint32_t exp_statsn; |
| |
| /* control data */ |
| int id; /* CID */ |
| struct list_head item; /* maintains list of conns */ |
| int c_stage; /* connection state */ |
| struct iscsi_mgmt_task *login_mtask; /* mtask used for login/text */ |
| struct iscsi_mgmt_task *mtask; /* xmit mtask in progress */ |
| struct iscsi_cmd_task *ctask; /* xmit ctask in progress */ |
| |
| /* xmit */ |
| struct kfifo *immqueue; /* immediate xmit queue */ |
| struct kfifo *mgmtqueue; /* mgmt (control) xmit queue */ |
| struct list_head mgmt_run_list; /* list of control tasks */ |
| struct kfifo *xmitqueue; /* data-path cmd queue */ |
| struct list_head run_list; /* list of cmds in progress */ |
| struct work_struct xmitwork; /* per-conn. xmit workqueue */ |
| /* |
| * serializes connection xmit, access to kfifos: |
| * xmitqueue, immqueue, mgmtqueue |
| */ |
| struct mutex xmitmutex; |
| |
| unsigned long suspend_tx; /* suspend Tx */ |
| unsigned long suspend_rx; /* suspend Rx */ |
| |
| /* abort */ |
| wait_queue_head_t ehwait; /* used in eh_abort() */ |
| struct iscsi_tm tmhdr; |
| struct timer_list tmabort_timer; |
| int tmabort_state; /* see TMABORT_INITIAL, etc.*/ |
| |
| /* negotiated params */ |
| int max_recv_dlength; /* initiator_max_recv_dsl*/ |
| int max_xmit_dlength; /* target_max_recv_dsl */ |
| int hdrdgst_en; |
| int datadgst_en; |
| |
| /* MIB-statistics */ |
| uint64_t txdata_octets; |
| uint64_t rxdata_octets; |
| uint32_t scsicmd_pdus_cnt; |
| uint32_t dataout_pdus_cnt; |
| uint32_t scsirsp_pdus_cnt; |
| uint32_t datain_pdus_cnt; |
| uint32_t r2t_pdus_cnt; |
| uint32_t tmfcmd_pdus_cnt; |
| int32_t tmfrsp_pdus_cnt; |
| |
| /* custom statistics */ |
| uint32_t eh_abort_cnt; |
| }; |
| |
| struct iscsi_queue { |
| struct kfifo *queue; /* FIFO Queue */ |
| void **pool; /* Pool of elements */ |
| int max; /* Max number of elements */ |
| }; |
| |
| struct iscsi_session { |
| /* iSCSI session-wide sequencing */ |
| uint32_t cmdsn; |
| uint32_t exp_cmdsn; |
| uint32_t max_cmdsn; |
| |
| /* configuration */ |
| int initial_r2t_en; |
| int max_r2t; |
| int imm_data_en; |
| int first_burst; |
| int max_burst; |
| int time2wait; |
| int time2retain; |
| int pdu_inorder_en; |
| int dataseq_inorder_en; |
| int erl; |
| int ifmarker_en; |
| int ofmarker_en; |
| |
| /* control data */ |
| struct iscsi_transport *tt; |
| struct Scsi_Host *host; |
| struct iscsi_conn *leadconn; /* leading connection */ |
| spinlock_t lock; /* protects session state, * |
| * sequence numbers, * |
| * session resources: * |
| * - cmdpool, * |
| * - mgmtpool, * |
| * - r2tpool */ |
| int state; /* session state */ |
| int recovery_failed; |
| struct list_head item; |
| int conn_cnt; |
| int age; /* counts session re-opens */ |
| |
| struct list_head connections; /* list of connections */ |
| int cmds_max; /* size of cmds array */ |
| struct iscsi_cmd_task **cmds; /* Original Cmds arr */ |
| struct iscsi_queue cmdpool; /* PDU's pool */ |
| int mgmtpool_max; /* size of mgmt array */ |
| struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */ |
| struct iscsi_queue mgmtpool; /* Mgmt PDU's pool */ |
| }; |
| |
| /* |
| * scsi host template |
| */ |
| extern int iscsi_change_queue_depth(struct scsi_device *sdev, int depth); |
| extern int iscsi_eh_abort(struct scsi_cmnd *sc); |
| extern int iscsi_eh_host_reset(struct scsi_cmnd *sc); |
| extern int iscsi_queuecommand(struct scsi_cmnd *sc, |
| void (*done)(struct scsi_cmnd *)); |
| |
| /* |
| * session management |
| */ |
| extern struct iscsi_cls_session * |
| iscsi_session_setup(struct iscsi_transport *, struct scsi_transport_template *, |
| int, int, uint32_t, uint32_t *); |
| extern void iscsi_session_teardown(struct iscsi_cls_session *); |
| extern struct iscsi_session *class_to_transport_session(struct iscsi_cls_session *); |
| extern void iscsi_start_session_recovery(struct iscsi_session *, |
| struct iscsi_conn *, int); |
| extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *); |
| |
| #define session_to_cls(_sess) \ |
| hostdata_session(_sess->host->hostdata) |
| |
| /* |
| * connection management |
| */ |
| extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *, |
| uint32_t); |
| extern void iscsi_conn_teardown(struct iscsi_cls_conn *); |
| extern int iscsi_conn_start(struct iscsi_cls_conn *); |
| extern void iscsi_conn_stop(struct iscsi_cls_conn *, int); |
| extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *, |
| int); |
| extern void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err); |
| |
| /* |
| * pdu and task processing |
| */ |
| extern int iscsi_check_assign_cmdsn(struct iscsi_session *, |
| struct iscsi_nopin *); |
| extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *, |
| struct iscsi_data *hdr, |
| int transport_data_cnt); |
| extern int iscsi_conn_send_pdu(struct iscsi_cls_conn *, struct iscsi_hdr *, |
| char *, uint32_t); |
| extern int iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, |
| char *, int); |
| extern int __iscsi_complete_pdu(struct iscsi_conn *, struct iscsi_hdr *, |
| char *, int); |
| extern int iscsi_verify_itt(struct iscsi_conn *, struct iscsi_hdr *, |
| uint32_t *); |
| |
| /* |
| * generic helpers |
| */ |
| extern void iscsi_pool_free(struct iscsi_queue *, void **); |
| extern int iscsi_pool_init(struct iscsi_queue *, int, void ***, int); |
| |
| #endif |