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linux/include/scsi/libiscsi.h
Mike Christie f6d5180c78 [SCSI] libiscsi: fix nop handling 
During root boot and shutdown the target could send us nops.
At this time iscsid cannot be running, so the target will drop
the session and the boot or shutdown will hang.

To handle this and allow us to better control when to check the network
this patch moves the nop handling to the kernel.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2008-01-11 18:28:35 -06:00

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/*
* 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 <linux/timer.h>
#include <linux/workqueue.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_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */
#define ISCSI_MGMT_CMDS_MAX 16 /* must be power of 2 */
#define ISCSI_MGMT_ITT_OFFSET 0xa00
#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 (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)
#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),
};
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 */
unsigned data_count; /* counts data to be sent */
uint32_t itt; /* this ITT */
void *dd_data; /* driver/transport data */
struct list_head running;
};
enum {
ISCSI_TASK_COMPLETED,
ISCSI_TASK_PENDING,
ISCSI_TASK_RUNNING,
};
struct iscsi_cmd_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 */
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_cmd_task *ctask)
{
return (void*)ctask->hdr + ctask->hdr_len;
}
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;
struct timer_list transport_timer;
unsigned long last_recv;
unsigned long last_ping;
int ping_timeout;
int recv_timeout;
struct iscsi_mgmt_task *ping_mtask;
/* 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_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 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];
/* local address */
int local_port;
char local_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;
};
struct iscsi_pool {
struct kfifo *queue; /* FIFO Queue */
void **pool; /* Pool of elements */
int max; /* Max number of elements */
};
struct iscsi_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 *initiatorname;
/* hw address or netdev iscsi connection is bound to */
char *hwaddress;
char *netdev;
/* 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 cmds_max; /* size of cmds array */
struct iscsi_cmd_task **cmds; /* Original Cmds arr */
struct iscsi_pool cmdpool; /* PDU's pool */
int mgmtpool_max; /* size of mgmt array */
struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */
struct iscsi_pool 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_eh_device_reset(struct scsi_cmnd *sc);
extern int iscsi_queuecommand(struct scsi_cmnd *sc,
void (*done)(struct scsi_cmnd *));
/*
* iSCSI host helpers.
*/
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);
/*
* session management
*/
extern struct iscsi_cls_session *
iscsi_session_setup(struct iscsi_transport *, struct scsi_transport_template *,
uint16_t, uint16_t, 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 *);
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 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);
extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
enum iscsi_param param, char *buf);
/*
* pdu and task processing
*/
extern void iscsi_update_cmdsn(struct iscsi_session *, struct iscsi_nopin *);
extern void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_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 *, struct iscsi_hdr *,
uint32_t *);
extern void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask);
extern void iscsi_free_mgmt_task(struct iscsi_conn *conn,
struct iscsi_mgmt_task *mtask);
/*
* 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
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