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libiscsi.h
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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/wait.h> #include <linux/mutex.h> #include <linux/timer.h> #include <linux/workqueue.h> #include <linux/kfifo.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; atomic_t refcount; struct list_head running; /* running cmd list */ void *dd_data; /* driver/transport data */ }; /* invalid scsi_task pointer */ #define INVALID_SCSI_TASK (struct iscsi_task *)-1l 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 */ 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 */ 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); /* * 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