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-rw-r--r--include/scsi/iscsi_if.h3
-rw-r--r--include/scsi/libiscsi.h286
-rw-r--r--include/scsi/scsi_transport_iscsi.h59
3 files changed, 334 insertions, 14 deletions
diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index eebe2b15161b..47524c726ee8 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -148,7 +148,8 @@ enum iscsi_err {
ISCSI_ERR_SESSION_FAILED = ISCSI_ERR_BASE + 13,
ISCSI_ERR_HDR_DGST = ISCSI_ERR_BASE + 14,
ISCSI_ERR_DATA_DGST = ISCSI_ERR_BASE + 15,
- ISCSI_ERR_PARAM_NOT_FOUND = ISCSI_ERR_BASE + 16
+ ISCSI_ERR_PARAM_NOT_FOUND = ISCSI_ERR_BASE + 16,
+ ISCSI_ERR_NO_SCSI_CMD = ISCSI_ERR_BASE + 17,
};
/*
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
new file mode 100644
index 000000000000..830700a4ed69
--- /dev/null
+++ b/include/scsi/libiscsi.h
@@ -0,0 +1,286 @@
+/*
+ * 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/mutex.h>
+#include <scsi/iscsi_proto.h>
+#include <scsi/iscsi_if.h>
+
+struct scsi_transport_template;
+struct scsi_device;
+struct Scsi_Host;
+struct scsi_cmnd;
+struct socket;
+struct iscsi_transport;
+struct iscsi_cls_session;
+struct iscsi_cls_conn;
+struct iscsi_session;
+struct iscsi_nopin;
+
+/* #define DEBUG_SCSI */
+#ifdef DEBUG_SCSI
+#define debug_scsi(fmt...) printk(KERN_INFO "scsi: " fmt)
+#else
+#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_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
+
+/* 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_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;
+};
+
+struct iscsi_cmd_task {
+ /*
+ * Becuae LLDs allocate their hdr differently, this is a pointer to
+ * that storage. It must be setup at session creation time.
+ */
+ struct iscsi_cmd *hdr;
+ 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 */
+ 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 */
+
+ struct list_head running; /* running cmd list */
+ void *dd_data; /* driver/transport data */
+};
+
+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;
+
+ /* 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 */
+ 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 */
+
+ /* xmit */
+ struct kfifo *immqueue; /* immediate xmit queue */
+ struct kfifo *mgmtqueue; /* mgmt (control) xmit queue */
+ struct list_head mgmt_run_list; /* list of control tasks */
+ struct kfifo *xmitqueue; /* data-path cmd queue */
+ struct list_head run_list; /* list of cmds in progress */
+ 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.*/
+
+ /* negotiated params */
+ int max_recv_dlength; /* initiator_max_recv_dsl*/
+ int max_xmit_dlength; /* target_max_recv_dsl */
+ int hdrdgst_en;
+ int datadgst_en;
+
+ /* 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;
+};
+
+struct iscsi_queue {
+ struct kfifo *queue; /* FIFO Queue */
+ void **pool; /* Pool of elements */
+ int max; /* Max number of elements */
+};
+
+struct iscsi_session {
+ /* iSCSI session-wide sequencing */
+ uint32_t cmdsn;
+ uint32_t exp_cmdsn;
+ uint32_t max_cmdsn;
+
+ /* configuration */
+ int initial_r2t_en;
+ int max_r2t;
+ int imm_data_en;
+ int first_burst;
+ int max_burst;
+ int time2wait;
+ int time2retain;
+ int pdu_inorder_en;
+ int dataseq_inorder_en;
+ int erl;
+ int ifmarker_en;
+ int ofmarker_en;
+
+ /* 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 recovery_failed;
+ struct list_head item;
+ int conn_cnt;
+ int age; /* counts session re-opens */
+
+ struct list_head connections; /* list of connections */
+ 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 */
+};
+
+/*
+ * scsi host template
+ */
+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_queuecommand(struct scsi_cmnd *sc,
+ void (*done)(struct scsi_cmnd *));
+
+/*
+ * session management
+ */
+extern struct iscsi_cls_session *
+iscsi_session_setup(struct iscsi_transport *, struct scsi_transport_template *,
+ int, int, uint32_t, uint32_t *);
+extern void iscsi_session_teardown(struct iscsi_cls_session *);
+extern struct iscsi_session *class_to_transport_session(struct iscsi_cls_session *);
+extern void iscsi_start_session_recovery(struct iscsi_session *,
+ struct iscsi_conn *, int);
+extern void iscsi_session_recovery_timedout(struct iscsi_cls_session *);
+
+#define session_to_cls(_sess) \
+ hostdata_session(_sess->host->hostdata)
+
+/*
+ * connection management
+ */
+extern struct iscsi_cls_conn *iscsi_conn_setup(struct iscsi_cls_session *,
+ 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);
+
+/*
+ * 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 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 *);
+
+/*
+ * generic helpers
+ */
+extern void iscsi_pool_free(struct iscsi_queue *, void **);
+extern int iscsi_pool_init(struct iscsi_queue *, int, void ***, int);
+
+#endif
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index 9d2b99159ee7..b332d6e839fe 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -2,7 +2,7 @@
* 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
*
@@ -27,9 +27,13 @@
#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
@@ -46,6 +50,20 @@ struct iscsi_cls_conn;
* @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
+ * @xmit_mgmt_task: requests LLD to transfer mgmt task
+ * @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
*/
@@ -56,8 +74,6 @@ struct iscsi_transport {
/* 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 connection data size */
int conndata_size;
/* LLD session data size */
@@ -65,8 +81,8 @@ struct iscsi_transport {
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 *hn);
+ 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);
@@ -90,6 +106,18 @@ struct iscsi_transport {
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);
};
@@ -106,6 +134,13 @@ extern void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error);
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 */
@@ -129,6 +164,12 @@ struct iscsi_cls_conn {
#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
+
struct iscsi_cls_session {
struct list_head sess_list; /* item in session_list */
struct list_head host_list;
@@ -174,12 +215,4 @@ extern int iscsi_destroy_conn(struct iscsi_cls_conn *conn);
extern void iscsi_unblock_session(struct iscsi_cls_session *session);
extern void iscsi_block_session(struct iscsi_cls_session *session);
-/*
- * 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);
-
#endif
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