mirror of
https://github.com/torvalds/linux.git
synced 2024-12-28 13:51:44 +00:00
67a611149b
If recovery failed or we are in recovery only overwrite the state if we are going to terminate the session or if we logged back in. STOP_CONN_SUSPEND and conn_cnt are not used. We only support a single connection session ATM, so cleanup that code while we are working around it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
283 lines
8.3 KiB
C
283 lines
8.3 KiB
C
/*
|
|
* 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 "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 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
|