/* * 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 #include #include #include 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 "iscsi: " 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 */ 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_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