#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 iscsi_cls_conn;
struct iscsi_session;
struct iscsi_nopin;
+struct device;
/* #define DEBUG_SCSI */
#ifdef DEBUG_SCSI
#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_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 */
-#define TMABORT_INITIAL 0x0
-#define TMABORT_SUCCESS 0x1
-#define TMABORT_FAILED 0x2
-#define TMABORT_TIMEDOUT 0x3
-#define TMABORT_NOT_FOUND 0x4
+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_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)
-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;
+#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_cmd_task {
+struct iscsi_task {
/*
- * Becuae LLDs allocate their hdr differently, this is a pointer to
- * that storage. It must be setup at session creation time.
+ * 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 */
- int datasn; /* DataSN */
uint32_t unsol_datasn;
- int imm_count; /* imm-data (bytes) */
- int unsol_count; /* unsolicited (bytes)*/
- int data_count; /* remaining Data-Out */
+ 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*/
- int total_length;
struct iscsi_conn *conn; /* used connection */
- struct iscsi_mgmt_task *mtask; /* tmf mtask in progr */
/* 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 */
/*
- * 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_task *ping_task;
/* 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 */
/*
* Preallocated buffer for pdus that have data but do not
* 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 */
+ struct iscsi_task *login_task; /* mtask used for login/text */
+ struct iscsi_task *task; /* xmit task in progress */
/* xmit */
- struct kfifo *immqueue; /* immediate xmit queue */
- struct kfifo *mgmtqueue; /* mgmt (control) xmit queue */
+ 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 */
- /*
- * 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.*/
+ struct timer_list tmf_timer;
+ int tmf_state; /* see TMF_INITIAL, etc.*/
/* negotiated params */
- int max_recv_dlength; /* initiator_max_recv_dsl*/
- int max_xmit_dlength; /* target_max_recv_dsl */
+ 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;
/* 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;
/* custom statistics */
uint32_t eh_abort_cnt;
+ uint32_t fmr_unalign_cnt;
};
-struct iscsi_queue {
+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;
- int max_r2t;
+ unsigned max_r2t;
int imm_data_en;
- int first_burst;
- int max_burst;
+ 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;
* - mgmtpool, *
* - r2tpool */
int state; /* session state */
- struct list_head item;
int age; /* counts session re-opens */
- struct list_head connections; /* list of connections */
+ int scsi_cmds_max; /* max scsi commands */
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 */
+ struct iscsi_task **cmds; /* Original Cmds arr */
+ struct iscsi_pool cmdpool; /* PDU's pool */
+};
+
+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];
};
/*
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.
+ */
+#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_transport_template *,
- int, int, uint32_t, uint32_t *);
+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 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)
+#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 *,
- uint32_t);
+ 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 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);
+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 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 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 *, struct iscsi_hdr *,
- uint32_t *);
+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_queue *, void **);
-extern int iscsi_pool_init(struct iscsi_queue *, int, void ***, int);
+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