#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>
+#include <scsi/scsi_transport_iscsi.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;
-
-/* #define DEBUG_SCSI */
-#ifdef DEBUG_SCSI
-#define debug_scsi(fmt...) printk(KERN_INFO "iscsi: " fmt)
-#else
-#define debug_scsi(fmt...)
-#endif
+struct device;
#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_CMDS_MAX 15
-#define ISCSI_MGMT_ITT_OFFSET 0xa00
-
-#define ISCSI_DEF_CMD_PER_LUN 32
-#define ISCSI_MAX_CMD_PER_LUN 128
+#define ISCSI_DEF_CMD_PER_LUN 32
/* 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)
+#define ISCSI_AGE_MASK 0xf
#define ISCSI_ADDRESS_BUF_LEN 64
-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 {
+ /* 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,
- ISCSI_TASK_ABORTING,
};
-struct iscsi_cmd_task {
+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 {
/*
- * 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;
+ 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;
+ uint8_t lun[8];
+
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 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 */
- struct iscsi_mgmt_task *mtask; /* tmf mtask in progr */
/* state set/tested under session->lock */
int state;
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 */
/*
- * 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;
* 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 *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 */
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 */
unsigned max_recv_dlength; /* initiator_max_recv_dsl*/
/* 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;
/* 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 queued_cmdsn;
/* configuration */
+ int abort_timeout;
+ int lu_reset_timeout;
int initial_r2t_en;
unsigned max_r2t;
int imm_data_en;
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;
- /* hw address or netdev iscsi connection is bound to */
- char *hwaddress;
- char *netdev;
/* control data */
struct iscsi_transport *tt;
struct Scsi_Host *host;
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_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 */
+};
+
+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;
+
+ struct workqueue_struct *workq;
+ char workq_name[20];
};
/*
*/
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_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,
+ bool xmit_can_sleep);
+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 *,
- uint16_t, uint16_t, 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 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 void iscsi_suspend_tx(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_unsolicit_data_pdu(struct iscsi_cmd_task *,
- struct iscsi_data *hdr);
+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 *, 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
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