418 lines
12 KiB
C
418 lines
12 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/wait.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/workqueue.h>
|
|
#include <scsi/iscsi_proto.h>
|
|
#include <scsi/iscsi_if.h>
|
|
|
|
struct scsi_transport_template;
|
|
struct scsi_host_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;
|
|
struct device;
|
|
|
|
/* #define DEBUG_SCSI */
|
|
#ifdef DEBUG_SCSI
|
|
#define debug_scsi(fmt...) printk(KERN_INFO "iscsi: " fmt)
|
|
#else
|
|
#define debug_scsi(fmt...)
|
|
#endif
|
|
|
|
#define ISCSI_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */
|
|
#define ISCSI_MGMT_CMDS_MAX 15
|
|
|
|
#define ISCSI_DEF_CMD_PER_LUN 32
|
|
#define ISCSI_MAX_CMD_PER_LUN 128
|
|
|
|
/* Task Mgmt states */
|
|
enum {
|
|
TMF_INITIAL,
|
|
TMF_QUEUED,
|
|
TMF_SUCCESS,
|
|
TMF_FAILED,
|
|
TMF_TIMEDOUT,
|
|
TMF_NOT_FOUND,
|
|
};
|
|
|
|
/* Connection suspend "bit" */
|
|
#define ISCSI_SUSPEND_BIT 1
|
|
|
|
#define ISCSI_ITT_MASK (0x1fff)
|
|
#define ISCSI_TOTAL_CMDS_MAX 4096
|
|
/* this must be a power of two greater than ISCSI_MGMT_CMDS_MAX */
|
|
#define ISCSI_TOTAL_CMDS_MIN 16
|
|
#define ISCSI_AGE_SHIFT 28
|
|
#define ISCSI_AGE_MASK (0xf << ISCSI_AGE_SHIFT)
|
|
|
|
#define ISCSI_ADDRESS_BUF_LEN 64
|
|
|
|
enum {
|
|
/* this is the maximum possible storage for AHSs */
|
|
ISCSI_MAX_AHS_SIZE = sizeof(struct iscsi_ecdb_ahdr) +
|
|
sizeof(struct iscsi_rlength_ahdr),
|
|
ISCSI_DIGEST_SIZE = sizeof(__u32),
|
|
};
|
|
|
|
|
|
enum {
|
|
ISCSI_TASK_COMPLETED,
|
|
ISCSI_TASK_PENDING,
|
|
ISCSI_TASK_RUNNING,
|
|
};
|
|
|
|
struct iscsi_task {
|
|
/*
|
|
* Because LLDs allocate their hdr differently, this is a pointer
|
|
* and length to that storage. It must be setup at session
|
|
* creation time.
|
|
*/
|
|
struct iscsi_cmd *hdr;
|
|
unsigned short hdr_max;
|
|
unsigned short hdr_len; /* accumulated size of hdr used */
|
|
int itt; /* this ITT */
|
|
|
|
uint32_t unsol_datasn;
|
|
unsigned imm_count; /* imm-data (bytes) */
|
|
unsigned unsol_count; /* unsolicited (bytes)*/
|
|
/* offset in unsolicited stream (bytes); */
|
|
unsigned unsol_offset;
|
|
unsigned data_count; /* remaining Data-Out */
|
|
char *data; /* mgmt payload */
|
|
struct scsi_cmnd *sc; /* associated SCSI cmd*/
|
|
struct iscsi_conn *conn; /* used connection */
|
|
|
|
/* state set/tested under session->lock */
|
|
int state;
|
|
atomic_t refcount;
|
|
struct list_head running; /* running cmd list */
|
|
void *dd_data; /* driver/transport data */
|
|
};
|
|
|
|
static inline void* iscsi_next_hdr(struct iscsi_task *task)
|
|
{
|
|
return (void*)task->hdr + task->hdr_len;
|
|
}
|
|
|
|
/* Connection's states */
|
|
enum {
|
|
ISCSI_CONN_INITIAL_STAGE,
|
|
ISCSI_CONN_STARTED,
|
|
ISCSI_CONN_STOPPED,
|
|
ISCSI_CONN_CLEANUP_WAIT,
|
|
};
|
|
|
|
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 */
|
|
/*
|
|
* conn_stop() flag: stop to recover, stop to terminate
|
|
*/
|
|
int stop_stage;
|
|
struct timer_list transport_timer;
|
|
unsigned long last_recv;
|
|
unsigned long last_ping;
|
|
int ping_timeout;
|
|
int recv_timeout;
|
|
struct iscsi_task *ping_task;
|
|
|
|
/* iSCSI connection-wide sequencing */
|
|
uint32_t exp_statsn;
|
|
|
|
/* control data */
|
|
int id; /* CID */
|
|
int c_stage; /* connection state */
|
|
/*
|
|
* Preallocated buffer for pdus that have data but do not
|
|
* originate from scsi-ml. We never have two pdus using the
|
|
* buffer at the same time. It is only allocated to
|
|
* the default max recv size because the pdus we support
|
|
* should always fit in this buffer
|
|
*/
|
|
char *data;
|
|
struct iscsi_task *login_task; /* mtask used for login/text */
|
|
struct iscsi_task *task; /* xmit task in progress */
|
|
|
|
/* xmit */
|
|
struct list_head mgmtqueue; /* mgmt (control) xmit queue */
|
|
struct list_head mgmt_run_list; /* list of control tasks */
|
|
struct list_head xmitqueue; /* data-path cmd queue */
|
|
struct list_head run_list; /* list of cmds in progress */
|
|
struct list_head requeue; /* tasks needing another run */
|
|
struct work_struct xmitwork; /* per-conn. xmit workqueue */
|
|
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 tmf_timer;
|
|
int tmf_state; /* see TMF_INITIAL, etc.*/
|
|
|
|
/* negotiated params */
|
|
unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
|
|
unsigned max_xmit_dlength; /* target_max_recv_dsl */
|
|
int hdrdgst_en;
|
|
int datadgst_en;
|
|
int ifmarker_en;
|
|
int ofmarker_en;
|
|
/* values userspace uses to id a conn */
|
|
int persistent_port;
|
|
char *persistent_address;
|
|
/* remote portal currently connected to */
|
|
int portal_port;
|
|
char portal_address[ISCSI_ADDRESS_BUF_LEN];
|
|
|
|
/* 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;
|
|
uint32_t fmr_unalign_cnt;
|
|
};
|
|
|
|
struct iscsi_pool {
|
|
struct kfifo *queue; /* FIFO Queue */
|
|
void **pool; /* Pool of elements */
|
|
int max; /* Max number of elements */
|
|
};
|
|
|
|
/* Session's states */
|
|
enum {
|
|
ISCSI_STATE_FREE = 1,
|
|
ISCSI_STATE_LOGGED_IN,
|
|
ISCSI_STATE_FAILED,
|
|
ISCSI_STATE_TERMINATE,
|
|
ISCSI_STATE_IN_RECOVERY,
|
|
ISCSI_STATE_RECOVERY_FAILED,
|
|
ISCSI_STATE_LOGGING_OUT,
|
|
};
|
|
|
|
struct iscsi_session {
|
|
struct iscsi_cls_session *cls_session;
|
|
/*
|
|
* Syncs up the scsi eh thread with the iscsi eh thread when sending
|
|
* task management functions. This must be taken before the session
|
|
* and recv lock.
|
|
*/
|
|
struct mutex eh_mutex;
|
|
|
|
/* iSCSI session-wide sequencing */
|
|
uint32_t cmdsn;
|
|
uint32_t exp_cmdsn;
|
|
uint32_t max_cmdsn;
|
|
|
|
/* This tracks the reqs queued into the initiator */
|
|
uint32_t queued_cmdsn;
|
|
|
|
/* configuration */
|
|
int abort_timeout;
|
|
int lu_reset_timeout;
|
|
int initial_r2t_en;
|
|
unsigned max_r2t;
|
|
int imm_data_en;
|
|
unsigned first_burst;
|
|
unsigned max_burst;
|
|
int time2wait;
|
|
int time2retain;
|
|
int pdu_inorder_en;
|
|
int dataseq_inorder_en;
|
|
int erl;
|
|
int fast_abort;
|
|
int tpgt;
|
|
char *username;
|
|
char *username_in;
|
|
char *password;
|
|
char *password_in;
|
|
char *targetname;
|
|
char *ifacename;
|
|
char *initiatorname;
|
|
/* 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 age; /* counts session re-opens */
|
|
|
|
int scsi_cmds_max; /* max scsi commands */
|
|
int cmds_max; /* size of cmds array */
|
|
struct iscsi_task **cmds; /* Original Cmds arr */
|
|
struct iscsi_pool cmdpool; /* PDU's pool */
|
|
};
|
|
|
|
enum {
|
|
ISCSI_HOST_SETUP,
|
|
ISCSI_HOST_REMOVED,
|
|
};
|
|
|
|
struct iscsi_host {
|
|
char *initiatorname;
|
|
/* hw address or netdev iscsi connection is bound to */
|
|
char *hwaddress;
|
|
char *netdev;
|
|
/* local address */
|
|
int local_port;
|
|
char local_address[ISCSI_ADDRESS_BUF_LEN];
|
|
|
|
wait_queue_head_t session_removal_wq;
|
|
/* protects sessions and state */
|
|
spinlock_t lock;
|
|
int num_sessions;
|
|
int state;
|
|
};
|
|
|
|
/*
|
|
* 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_target_reset(struct scsi_cmnd *sc);
|
|
extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
|
|
extern int iscsi_queuecommand(struct scsi_cmnd *sc,
|
|
void (*done)(struct scsi_cmnd *));
|
|
|
|
/*
|
|
* iSCSI host helpers.
|
|
*/
|
|
#define iscsi_host_priv(_shost) \
|
|
(shost_priv(_shost) + sizeof(struct iscsi_host))
|
|
|
|
extern int iscsi_host_set_param(struct Scsi_Host *shost,
|
|
enum iscsi_host_param param, char *buf,
|
|
int buflen);
|
|
extern int iscsi_host_get_param(struct Scsi_Host *shost,
|
|
enum iscsi_host_param param, char *buf);
|
|
extern int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev);
|
|
extern struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
|
|
int dd_data_size, uint16_t qdepth);
|
|
extern void iscsi_host_remove(struct Scsi_Host *shost);
|
|
extern void iscsi_host_free(struct Scsi_Host *shost);
|
|
|
|
/*
|
|
* session management
|
|
*/
|
|
extern struct iscsi_cls_session *
|
|
iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost,
|
|
uint16_t, int, uint32_t, unsigned int);
|
|
extern void iscsi_session_teardown(struct iscsi_cls_session *);
|
|
extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
|
|
extern int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
|
|
enum iscsi_param param, char *buf, int buflen);
|
|
extern int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
|
|
enum iscsi_param param, char *buf);
|
|
|
|
#define iscsi_session_printk(prefix, _sess, fmt, a...) \
|
|
iscsi_cls_session_printk(prefix, _sess->cls_session, fmt, ##a)
|
|
|
|
/*
|
|
* connection management
|
|
*/
|
|
extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
|
|
int, 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);
|
|
extern void iscsi_session_failure(struct iscsi_cls_session *cls_session,
|
|
enum iscsi_err err);
|
|
extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
|
|
enum iscsi_param param, char *buf);
|
|
extern void iscsi_suspend_tx(struct iscsi_conn *conn);
|
|
|
|
#define iscsi_conn_printk(prefix, _c, fmt, a...) \
|
|
iscsi_cls_conn_printk(prefix, ((struct iscsi_conn *)_c)->cls_conn, \
|
|
fmt, ##a)
|
|
|
|
/*
|
|
* pdu and task processing
|
|
*/
|
|
extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
|
|
extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_task *,
|
|
struct iscsi_data *hdr);
|
|
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 *, itt_t);
|
|
extern struct iscsi_task *iscsi_itt_to_ctask(struct iscsi_conn *, itt_t);
|
|
extern void iscsi_requeue_task(struct iscsi_task *task);
|
|
extern void iscsi_put_task(struct iscsi_task *task);
|
|
extern void __iscsi_get_task(struct iscsi_task *task);
|
|
|
|
/*
|
|
* generic helpers
|
|
*/
|
|
extern void iscsi_pool_free(struct iscsi_pool *);
|
|
extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int);
|
|
|
|
/*
|
|
* inline functions to deal with padding.
|
|
*/
|
|
static inline unsigned int
|
|
iscsi_padded(unsigned int len)
|
|
{
|
|
return (len + ISCSI_PAD_LEN - 1) & ~(ISCSI_PAD_LEN - 1);
|
|
}
|
|
|
|
static inline unsigned int
|
|
iscsi_padding(unsigned int len)
|
|
{
|
|
len &= (ISCSI_PAD_LEN - 1);
|
|
if (len)
|
|
len = ISCSI_PAD_LEN - len;
|
|
return len;
|
|
}
|
|
|
|
#endif
|