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linux_dsm_epyc7002/include/scsi/libiscsi.h
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* 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
*/
#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 <linux/kfifo.h>
#include <linux/refcount.h>
#include <scsi/iscsi_proto.h>
#include <scsi/iscsi_if.h>
#include <scsi/scsi_transport_iscsi.h>
struct scsi_transport_template;
struct scsi_host_template;
struct scsi_device;
struct Scsi_Host;
struct scsi_target;
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 ISCSI_DEF_XMIT_CMDS_MAX 128 /* must be power of 2 */
#define ISCSI_MGMT_CMDS_MAX 15
#define ISCSI_DEF_CMD_PER_LUN 32
/* Task Mgmt states */
enum {
TMF_INITIAL,
TMF_QUEUED,
TMF_SUCCESS,
TMF_FAILED,
TMF_TIMEDOUT,
TMF_NOT_FOUND,
};
#define ISID_SIZE 6
/* 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
#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_FREE,
ISCSI_TASK_COMPLETED,
ISCSI_TASK_PENDING,
ISCSI_TASK_RUNNING,
ISCSI_TASK_ABRT_TMF, /* aborted due to TMF */
ISCSI_TASK_ABRT_SESS_RECOV, /* aborted due to session recovery */
ISCSI_TASK_REQUEUE_SCSIQ, /* qcmd requeueing to scsi-ml */
};
struct iscsi_r2t_info {
__be32 ttt; /* copied from R2T */
__be32 exp_statsn; /* copied from R2T */
uint32_t data_length; /* copied from R2T */
uint32_t data_offset; /* copied from R2T */
int data_count; /* DATA-Out payload progress */
int datasn;
/* LLDs should set/update these values */
int sent; /* R2T sequence progress */
};
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_hdr *hdr;
unsigned short hdr_max;
unsigned short hdr_len; /* accumulated size of hdr used */
/* copied values in case we need to send tmfs */
itt_t hdr_itt;
__be32 cmdsn;
struct scsi_lun lun;
int itt; /* this ITT */
unsigned imm_count; /* imm-data (bytes) */
/* offset in unsolicited stream (bytes); */
struct iscsi_r2t_info unsol_r2t;
char *data; /* mgmt payload */
unsigned data_count;
struct scsi_cmnd *sc; /* associated SCSI cmd*/
struct iscsi_conn *conn; /* used connection */
/* data processing tracking */
unsigned long last_xfer;
unsigned long last_timeout;
bool have_checked_conn;
/* T10 protection information */
bool protected;
/* state set/tested under session->lock */
int state;
refcount_t refcount;
struct list_head running; /* running cmd list */
void *dd_data; /* driver/transport data */
};
static inline int iscsi_task_has_unsol_data(struct iscsi_task *task)
{
return task->unsol_r2t.data_length > task->unsol_r2t.sent;
}
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;
uint32_t 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 */
spinlock_t taskqueuelock; /* protects the next three lists */
struct list_head mgmtqueue; /* mgmt (control) xmit queue */
struct list_head cmdqueue; /* data-path cmd queue */
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;
unsigned max_segment_size;
unsigned tcp_xmit_wsf;
unsigned tcp_recv_wsf;
uint16_t keepalive_tmo;
uint16_t local_port;
uint8_t tcp_timestamp_stat;
uint8_t tcp_nagle_disable;
uint8_t tcp_wsf_disable;
uint8_t tcp_timer_scale;
uint8_t tcp_timestamp_en;
uint8_t fragment_disable;
uint8_t ipv4_tos;
uint8_t ipv6_traffic_class;
uint8_t ipv6_flow_label;
uint8_t is_fw_assigned_ipv6;
char *local_ipaddr;
/* 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 tgt_reset_timeout;
int initial_r2t_en;
unsigned short 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 *targetalias;
char *ifacename;
char *initiatorname;
char *boot_root;
char *boot_nic;
char *boot_target;
char *portal_type;
char *discovery_parent_type;
uint16_t discovery_parent_idx;
uint16_t def_taskmgmt_tmo;
uint16_t tsid;
uint8_t auto_snd_tgt_disable;
uint8_t discovery_sess;
uint8_t chap_auth_en;
uint8_t discovery_logout_en;
uint8_t bidi_chap_en;
uint8_t discovery_auth_optional;
uint8_t isid[ISID_SIZE];
/* control data */
struct iscsi_transport *tt;
struct Scsi_Host *host;
struct iscsi_conn *leadconn; /* leading connection */
/* Between the forward and the backward locks exists a strict locking
* hierarchy. The mutual exclusion zone protected by the forward lock
* can enclose the mutual exclusion zone protected by the backward lock
* but not vice versa.
*/
spinlock_t frwd_lock; /* protects session state, *
* cmdsn, queued_cmdsn *
* session resources: *
* - cmdpool kfifo_out , *
* - mgmtpool, */
spinlock_t back_lock; /* protects cmdsn_exp *
* cmdsn_max, *
* cmdpool kfifo_in */
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 */
void *dd_data; /* LLD private data */
};
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;
wait_queue_head_t session_removal_wq;
/* protects sessions and state */
spinlock_t lock;
int num_sessions;
int state;
struct workqueue_struct *workq;
char workq_name[20];
};
/*
* scsi host template
*/
extern int iscsi_eh_abort(struct scsi_cmnd *sc);
extern int iscsi_eh_recover_target(struct scsi_cmnd *sc);
extern int iscsi_eh_session_reset(struct scsi_cmnd *sc);
extern int iscsi_eh_device_reset(struct scsi_cmnd *sc);
extern int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc);
extern enum blk_eh_timer_return iscsi_eh_cmd_timed_out(struct scsi_cmnd *sc);
/*
* 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,
bool xmit_can_sleep);
extern void iscsi_host_remove(struct Scsi_Host *shost);
extern void iscsi_host_free(struct Scsi_Host *shost);
extern int iscsi_target_alloc(struct scsi_target *starget);
/*
* session management
*/
extern struct iscsi_cls_session *
iscsi_session_setup(struct iscsi_transport *, struct Scsi_Host *shost,
uint16_t, int, 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_session *session,
enum iscsi_err err);
extern int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
enum iscsi_param param, char *buf);
extern int iscsi_conn_get_addr_param(struct sockaddr_storage *addr,
enum iscsi_param param, char *buf);
extern void iscsi_suspend_tx(struct iscsi_conn *conn);
extern void iscsi_suspend_queue(struct iscsi_conn *conn);
extern void iscsi_conn_queue_work(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_data_out_pdu(struct iscsi_task *task,
struct iscsi_r2t_info *r2t,
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 struct iscsi_task *iscsi_itt_to_task(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_put_task(struct iscsi_task *task);
extern void __iscsi_get_task(struct iscsi_task *task);
extern void iscsi_complete_scsi_task(struct iscsi_task *task,
uint32_t exp_cmdsn, uint32_t max_cmdsn);
/*
* generic helpers
*/
extern void iscsi_pool_free(struct iscsi_pool *);
extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int);
extern int iscsi_switch_str_param(char **, char *);
/*
* 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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