* iSCSI transport class definitions
*
* Copyright (C) IBM Corporation, 2004
- * Copyright (C) Mike Christie, 2004 - 2005
+ * Copyright (C) Mike Christie, 2004 - 2006
* Copyright (C) Dmitry Yusupov, 2004 - 2005
* Copyright (C) Alex Aizman, 2004 - 2005
*
#include <scsi/iscsi_if.h>
struct scsi_transport_template;
+struct iscsi_transport;
struct Scsi_Host;
struct mempool_zone;
struct iscsi_cls_conn;
+struct iscsi_conn;
+struct iscsi_cmd_task;
+struct iscsi_mgmt_task;
/**
* struct iscsi_transport - iSCSI Transport template
* @start_conn: set connection to be operational
* @stop_conn: suspend/recover/terminate connection
* @send_pdu: send iSCSI PDU, Login, Logout, NOP-Out, Reject, Text.
+ * @session_recovery_timedout: notify LLD a block during recovery timed out
+ * @suspend_conn_recv: susepend the recv side of the connection
+ * @termincate_conn: destroy socket connection. Called with mutex lock.
+ * @init_cmd_task: Initialize a iscsi_cmd_task and any internal structs.
+ * Called from queuecommand with session lock held.
+ * @init_mgmt_task: Initialize a iscsi_mgmt_task and any internal structs.
+ * Called from iscsi_conn_send_generic with xmitmutex.
+ * @xmit_cmd_task: Requests LLD to transfer cmd task. Returns 0 or the
+ * the number of bytes transferred on success, and -Exyz
+ * value on error.
+ * @xmit_mgmt_task: Requests LLD to transfer mgmt task. Returns 0 or the
+ * the number of bytes transferred on success, and -Exyz
+ * value on error.
+ * @cleanup_cmd_task: requests LLD to fail cmd task. Called with xmitmutex
+ * and session->lock after the connection has been
+ * suspended and terminated during recovery. If called
+ * from abort task then connection is not suspended
+ * or terminated but sk_callback_lock is held
*
* Template API provided by iSCSI Transport
*/
struct module *owner;
char *name;
unsigned int caps;
+ /* LLD sets this to indicate what values it can export to sysfs */
+ unsigned int param_mask;
struct scsi_host_template *host_template;
- /* LLD session/scsi_host data size */
- int hostdata_size;
- /* LLD iscsi_host data size */
- int ihostdata_size;
/* LLD connection data size */
int conndata_size;
+ /* LLD session data size */
+ int sessiondata_size;
int max_lun;
unsigned int max_conn;
unsigned int max_cmd_len;
- struct iscsi_cls_session *(*create_session)
- (struct scsi_transport_template *t, uint32_t sn, uint32_t *sid);
+ struct iscsi_cls_session *(*create_session) (struct iscsi_transport *it,
+ struct scsi_transport_template *t, uint32_t sn, uint32_t *hn);
void (*destroy_session) (struct iscsi_cls_session *session);
struct iscsi_cls_conn *(*create_conn) (struct iscsi_cls_session *sess,
uint32_t cid);
int (*bind_conn) (struct iscsi_cls_session *session,
struct iscsi_cls_conn *cls_conn,
- uint32_t transport_fd, int is_leading);
+ uint64_t transport_eph, int is_leading);
int (*start_conn) (struct iscsi_cls_conn *conn);
void (*stop_conn) (struct iscsi_cls_conn *conn, int flag);
void (*destroy_conn) (struct iscsi_cls_conn *conn);
int (*set_param) (struct iscsi_cls_conn *conn, enum iscsi_param param,
uint32_t value);
int (*get_conn_param) (struct iscsi_cls_conn *conn,
- enum iscsi_param param,
- uint32_t *value);
+ enum iscsi_param param, uint32_t *value);
int (*get_session_param) (struct iscsi_cls_session *session,
enum iscsi_param param, uint32_t *value);
+ int (*get_conn_str_param) (struct iscsi_cls_conn *conn,
+ enum iscsi_param param, char *buf);
+ int (*get_session_str_param) (struct iscsi_cls_session *session,
+ enum iscsi_param param, char *buf);
int (*send_pdu) (struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
char *data, uint32_t data_size);
void (*get_stats) (struct iscsi_cls_conn *conn,
struct iscsi_stats *stats);
+ void (*suspend_conn_recv) (struct iscsi_conn *conn);
+ void (*terminate_conn) (struct iscsi_conn *conn);
+ void (*init_cmd_task) (struct iscsi_cmd_task *ctask);
+ void (*init_mgmt_task) (struct iscsi_conn *conn,
+ struct iscsi_mgmt_task *mtask,
+ char *data, uint32_t data_size);
+ int (*xmit_cmd_task) (struct iscsi_conn *conn,
+ struct iscsi_cmd_task *ctask);
+ void (*cleanup_cmd_task) (struct iscsi_conn *conn,
+ struct iscsi_cmd_task *ctask);
+ int (*xmit_mgmt_task) (struct iscsi_conn *conn,
+ struct iscsi_mgmt_task *mtask);
+ void (*session_recovery_timedout) (struct iscsi_cls_session *session);
+ int (*ep_connect) (struct sockaddr *dst_addr, int non_blocking,
+ uint64_t *ep_handle);
+ int (*ep_poll) (uint64_t ep_handle, int timeout_ms);
+ void (*ep_disconnect) (uint64_t ep_handle);
};
/*
extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
char *data, uint32_t data_size);
+
+/* Connection's states */
+#define ISCSI_CONN_INITIAL_STAGE 0
+#define ISCSI_CONN_STARTED 1
+#define ISCSI_CONN_STOPPED 2
+#define ISCSI_CONN_CLEANUP_WAIT 3
+
struct iscsi_cls_conn {
struct list_head conn_list; /* item in connlist */
void *dd_data; /* LLD private data */
struct iscsi_transport *transport;
+ uint32_t cid; /* connection id */
+
+ /* portal/group values we got during discovery */
+ char *persistent_address;
+ int persistent_port;
+ /* portal/group values we are currently using */
+ char *address;
+ int port;
+
int active; /* must be accessed with the connlock */
struct device dev; /* sysfs transport/container device */
struct mempool_zone *z_error;
#define iscsi_dev_to_conn(_dev) \
container_of(_dev, struct iscsi_cls_conn, dev)
+/* Session's states */
+#define ISCSI_STATE_FREE 1
+#define ISCSI_STATE_LOGGED_IN 2
+#define ISCSI_STATE_FAILED 3
+#define ISCSI_STATE_TERMINATE 4
+#define ISCSI_STATE_IN_RECOVERY 5
+#define ISCSI_STATE_RECOVERY_FAILED 6
+
struct iscsi_cls_session {
struct list_head sess_list; /* item in session_list */
+ struct list_head host_list;
struct iscsi_transport *transport;
+
+ /* iSCSI values used as unique id by userspace. */
+ char *targetname;
+ int tpgt;
+
+ /* recovery fields */
+ int recovery_tmo;
+ struct work_struct recovery_work;
+
+ int target_id;
+ int channel;
+
+ int sid; /* session id */
+ void *dd_data; /* LLD private data */
struct device dev; /* sysfs transport/container device */
};
#define iscsi_session_to_shost(_session) \
dev_to_shost(_session->dev.parent)
+struct iscsi_host {
+ int next_target_id;
+ struct list_head sessions;
+ struct mutex mutex;
+};
+
/*
* session and connection functions that can be used by HW iSCSI LLDs
*/
extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
- struct iscsi_transport *t);
+ struct iscsi_transport *t, int channel);
extern int iscsi_destroy_session(struct iscsi_cls_session *session);
extern struct iscsi_cls_conn *iscsi_create_conn(struct iscsi_cls_session *sess,
uint32_t cid);
extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
-
-/*
- * session functions used by software iscsi
- */
-extern struct Scsi_Host *
-iscsi_transport_create_session(struct scsi_transport_template *scsit,
- struct iscsi_transport *transport);
-extern int iscsi_transport_destroy_session(struct Scsi_Host *shost);
+extern void iscsi_unblock_session(struct iscsi_cls_session *session);
+extern void iscsi_block_session(struct iscsi_cls_session *session);
#endif
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