Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (102 commits)
  [SCSI] scsi_dh: fix kconfig related build errors
  [SCSI] sym53c8xx: Fix bogus sym_que_entry re-implementation of container_of
  [SCSI] scsi_cmnd.h: remove double inclusion of linux/blkdev.h
  [SCSI] make struct scsi_{host,target}_type static
  [SCSI] fix locking in host use of blk_plug_device()
  [SCSI] zfcp: Cleanup external header file
  [SCSI] zfcp: Cleanup code in zfcp_erp.c
  [SCSI] zfcp: zfcp_fsf cleanup.
  [SCSI] zfcp: consolidate sysfs things into one file.
  [SCSI] zfcp: Cleanup of code in zfcp_aux.c
  [SCSI] zfcp: Cleanup of code in zfcp_scsi.c
  [SCSI] zfcp: Move status accessors from zfcp to SCSI include file.
  [SCSI] zfcp: Small QDIO cleanups
  [SCSI] zfcp: Adapter reopen for large number of unsolicited status
  [SCSI] zfcp: Fix error checking for ELS ADISC requests
  [SCSI] zfcp: wait until adapter is finished with ERP during auto-port
  [SCSI] ibmvfc: IBM Power Virtual Fibre Channel Adapter Client Driver
  [SCSI] sg: Add target reset support
  [SCSI] lib: Add support for the T10 (SCSI) Data Integrity Field CRC
  [SCSI] sd: Move scsi_disk() accessor function to sd.h
  ...

11 files changed, 269 insertions, 201 deletions

diff --git a/include/linux/crc-t10dif.h b/include/linux/crc-t10dif.h
new file mode 100644
index 000000000000..a9c96d865ee7
--- /dev/null
+++ b/include/linux/crc-t10dif.h
@@ -0,0 +1,8 @@
+#ifndef _LINUX_CRC_T10DIF_H
+#define _LINUX_CRC_T10DIF_H
+
+#include <linux/types.h>
+
+__u16 crc_t10dif(unsigned char const *, size_t);
+
+#endif
diff --git a/include/scsi/iscsi_if.h b/include/scsi/iscsi_if.h
index e19e58423166..16be12f1cbe8 100644
--- a/include/scsi/iscsi_if.h
+++ b/include/scsi/iscsi_if.h
@@ -50,6 +50,7 @@ enum iscsi_uevent_e {
 	ISCSI_UEVENT_TGT_DSCVR		= UEVENT_BASE + 15,
 	ISCSI_UEVENT_SET_HOST_PARAM	= UEVENT_BASE + 16,
 	ISCSI_UEVENT_UNBIND_SESSION	= UEVENT_BASE + 17,
+	ISCSI_UEVENT_CREATE_BOUND_SESSION	= UEVENT_BASE + 18,
 
 	/* up events */
 	ISCSI_KEVENT_RECV_PDU		= KEVENT_BASE + 1,
@@ -78,6 +79,12 @@ struct iscsi_uevent {
 			uint16_t	cmds_max;
 			uint16_t	queue_depth;
 		} c_session;
+		struct msg_create_bound_session {
+			uint64_t	ep_handle;
+			uint32_t	initial_cmdsn;
+			uint16_t	cmds_max;
+			uint16_t	queue_depth;
+		} c_bound_session;
 		struct msg_destroy_session {
 			uint32_t	sid;
 		} d_session;
@@ -250,42 +257,49 @@ enum iscsi_param {
 
 	ISCSI_PARAM_PING_TMO,
 	ISCSI_PARAM_RECV_TMO,
+
+	ISCSI_PARAM_IFACE_NAME,
+	ISCSI_PARAM_ISID,
+	ISCSI_PARAM_INITIATOR_NAME,
 	/* must always be last */
 	ISCSI_PARAM_MAX,
 };
 
-#define ISCSI_MAX_RECV_DLENGTH		(1 << ISCSI_PARAM_MAX_RECV_DLENGTH)
-#define ISCSI_MAX_XMIT_DLENGTH		(1 << ISCSI_PARAM_MAX_XMIT_DLENGTH)
-#define ISCSI_HDRDGST_EN		(1 << ISCSI_PARAM_HDRDGST_EN)
-#define ISCSI_DATADGST_EN		(1 << ISCSI_PARAM_DATADGST_EN)
-#define ISCSI_INITIAL_R2T_EN		(1 << ISCSI_PARAM_INITIAL_R2T_EN)
-#define ISCSI_MAX_R2T			(1 << ISCSI_PARAM_MAX_R2T)
-#define ISCSI_IMM_DATA_EN		(1 << ISCSI_PARAM_IMM_DATA_EN)
-#define ISCSI_FIRST_BURST		(1 << ISCSI_PARAM_FIRST_BURST)
-#define ISCSI_MAX_BURST			(1 << ISCSI_PARAM_MAX_BURST)
-#define ISCSI_PDU_INORDER_EN		(1 << ISCSI_PARAM_PDU_INORDER_EN)
-#define ISCSI_DATASEQ_INORDER_EN	(1 << ISCSI_PARAM_DATASEQ_INORDER_EN)
-#define ISCSI_ERL			(1 << ISCSI_PARAM_ERL)
-#define ISCSI_IFMARKER_EN		(1 << ISCSI_PARAM_IFMARKER_EN)
-#define ISCSI_OFMARKER_EN		(1 << ISCSI_PARAM_OFMARKER_EN)
-#define ISCSI_EXP_STATSN		(1 << ISCSI_PARAM_EXP_STATSN)
-#define ISCSI_TARGET_NAME		(1 << ISCSI_PARAM_TARGET_NAME)
-#define ISCSI_TPGT			(1 << ISCSI_PARAM_TPGT)
-#define ISCSI_PERSISTENT_ADDRESS	(1 << ISCSI_PARAM_PERSISTENT_ADDRESS)
-#define ISCSI_PERSISTENT_PORT		(1 << ISCSI_PARAM_PERSISTENT_PORT)
-#define ISCSI_SESS_RECOVERY_TMO		(1 << ISCSI_PARAM_SESS_RECOVERY_TMO)
-#define ISCSI_CONN_PORT			(1 << ISCSI_PARAM_CONN_PORT)
-#define ISCSI_CONN_ADDRESS		(1 << ISCSI_PARAM_CONN_ADDRESS)
-#define ISCSI_USERNAME			(1 << ISCSI_PARAM_USERNAME)
-#define ISCSI_USERNAME_IN		(1 << ISCSI_PARAM_USERNAME_IN)
-#define ISCSI_PASSWORD			(1 << ISCSI_PARAM_PASSWORD)
-#define ISCSI_PASSWORD_IN		(1 << ISCSI_PARAM_PASSWORD_IN)
-#define ISCSI_FAST_ABORT		(1 << ISCSI_PARAM_FAST_ABORT)
-#define ISCSI_ABORT_TMO			(1 << ISCSI_PARAM_ABORT_TMO)
-#define ISCSI_LU_RESET_TMO		(1 << ISCSI_PARAM_LU_RESET_TMO)
-#define ISCSI_HOST_RESET_TMO		(1 << ISCSI_PARAM_HOST_RESET_TMO)
-#define ISCSI_PING_TMO			(1 << ISCSI_PARAM_PING_TMO)
-#define ISCSI_RECV_TMO			(1 << ISCSI_PARAM_RECV_TMO)
+#define ISCSI_MAX_RECV_DLENGTH		(1ULL << ISCSI_PARAM_MAX_RECV_DLENGTH)
+#define ISCSI_MAX_XMIT_DLENGTH		(1ULL << ISCSI_PARAM_MAX_XMIT_DLENGTH)
+#define ISCSI_HDRDGST_EN		(1ULL << ISCSI_PARAM_HDRDGST_EN)
+#define ISCSI_DATADGST_EN		(1ULL << ISCSI_PARAM_DATADGST_EN)
+#define ISCSI_INITIAL_R2T_EN		(1ULL << ISCSI_PARAM_INITIAL_R2T_EN)
+#define ISCSI_MAX_R2T			(1ULL << ISCSI_PARAM_MAX_R2T)
+#define ISCSI_IMM_DATA_EN		(1ULL << ISCSI_PARAM_IMM_DATA_EN)
+#define ISCSI_FIRST_BURST		(1ULL << ISCSI_PARAM_FIRST_BURST)
+#define ISCSI_MAX_BURST			(1ULL << ISCSI_PARAM_MAX_BURST)
+#define ISCSI_PDU_INORDER_EN		(1ULL << ISCSI_PARAM_PDU_INORDER_EN)
+#define ISCSI_DATASEQ_INORDER_EN	(1ULL << ISCSI_PARAM_DATASEQ_INORDER_EN)
+#define ISCSI_ERL			(1ULL << ISCSI_PARAM_ERL)
+#define ISCSI_IFMARKER_EN		(1ULL << ISCSI_PARAM_IFMARKER_EN)
+#define ISCSI_OFMARKER_EN		(1ULL << ISCSI_PARAM_OFMARKER_EN)
+#define ISCSI_EXP_STATSN		(1ULL << ISCSI_PARAM_EXP_STATSN)
+#define ISCSI_TARGET_NAME		(1ULL << ISCSI_PARAM_TARGET_NAME)
+#define ISCSI_TPGT			(1ULL << ISCSI_PARAM_TPGT)
+#define ISCSI_PERSISTENT_ADDRESS	(1ULL << ISCSI_PARAM_PERSISTENT_ADDRESS)
+#define ISCSI_PERSISTENT_PORT		(1ULL << ISCSI_PARAM_PERSISTENT_PORT)
+#define ISCSI_SESS_RECOVERY_TMO		(1ULL << ISCSI_PARAM_SESS_RECOVERY_TMO)
+#define ISCSI_CONN_PORT			(1ULL << ISCSI_PARAM_CONN_PORT)
+#define ISCSI_CONN_ADDRESS		(1ULL << ISCSI_PARAM_CONN_ADDRESS)
+#define ISCSI_USERNAME			(1ULL << ISCSI_PARAM_USERNAME)
+#define ISCSI_USERNAME_IN		(1ULL << ISCSI_PARAM_USERNAME_IN)
+#define ISCSI_PASSWORD			(1ULL << ISCSI_PARAM_PASSWORD)
+#define ISCSI_PASSWORD_IN		(1ULL << ISCSI_PARAM_PASSWORD_IN)
+#define ISCSI_FAST_ABORT		(1ULL << ISCSI_PARAM_FAST_ABORT)
+#define ISCSI_ABORT_TMO			(1ULL << ISCSI_PARAM_ABORT_TMO)
+#define ISCSI_LU_RESET_TMO		(1ULL << ISCSI_PARAM_LU_RESET_TMO)
+#define ISCSI_HOST_RESET_TMO		(1ULL << ISCSI_PARAM_HOST_RESET_TMO)
+#define ISCSI_PING_TMO			(1ULL << ISCSI_PARAM_PING_TMO)
+#define ISCSI_RECV_TMO			(1ULL << ISCSI_PARAM_RECV_TMO)
+#define ISCSI_IFACE_NAME		(1ULL << ISCSI_PARAM_IFACE_NAME)
+#define ISCSI_ISID			(1ULL << ISCSI_PARAM_ISID)
+#define ISCSI_INITIATOR_NAME		(1ULL << ISCSI_PARAM_INITIATOR_NAME)
 
 /* iSCSI HBA params */
 enum iscsi_host_param {
@@ -296,20 +310,13 @@ enum iscsi_host_param {
 	ISCSI_HOST_PARAM_MAX,
 };
 
-#define ISCSI_HOST_HWADDRESS		(1 << ISCSI_HOST_PARAM_HWADDRESS)
-#define ISCSI_HOST_INITIATOR_NAME	(1 << ISCSI_HOST_PARAM_INITIATOR_NAME)
-#define ISCSI_HOST_NETDEV_NAME		(1 << ISCSI_HOST_PARAM_NETDEV_NAME)
-#define ISCSI_HOST_IPADDRESS		(1 << ISCSI_HOST_PARAM_IPADDRESS)
+#define ISCSI_HOST_HWADDRESS		(1ULL << ISCSI_HOST_PARAM_HWADDRESS)
+#define ISCSI_HOST_INITIATOR_NAME	(1ULL << ISCSI_HOST_PARAM_INITIATOR_NAME)
+#define ISCSI_HOST_NETDEV_NAME		(1ULL << ISCSI_HOST_PARAM_NETDEV_NAME)
+#define ISCSI_HOST_IPADDRESS		(1ULL << ISCSI_HOST_PARAM_IPADDRESS)
 
 #define iscsi_ptr(_handle) ((void*)(unsigned long)_handle)
 #define iscsi_handle(_ptr) ((uint64_t)(unsigned long)_ptr)
-#define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
-
-/**
- * iscsi_hostdata - get LLD hostdata from scsi_host
- * @_hostdata: pointer to scsi host's hostdata
- **/
-#define iscsi_hostdata(_hostdata) ((void*)_hostdata + sizeof(unsigned long))
 
 /*
  * These flags presents iSCSI Data-Path capabilities.
diff --git a/include/scsi/iscsi_proto.h b/include/scsi/iscsi_proto.h
index e0593bfae622..f2a2c1169486 100644
--- a/include/scsi/iscsi_proto.h
+++ b/include/scsi/iscsi_proto.h
@@ -22,6 +22,7 @@
 #define ISCSI_PROTO_H
 
 #include <linux/types.h>
+#include <scsi/scsi.h>
 
 #define ISCSI_DRAFT20_VERSION	0x00
 
@@ -156,7 +157,7 @@ struct iscsi_ecdb_ahdr {
 	uint8_t ahstype;
 	uint8_t reserved;
 	/* 4-byte aligned extended CDB spillover */
-	uint8_t ecdb[260 - ISCSI_CDB_SIZE];
+	uint8_t ecdb[SCSI_MAX_VARLEN_CDB_SIZE - ISCSI_CDB_SIZE];
 };
 
 /* SCSI Response Header */
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index cd3ca63d4fb1..5e75bb7f311c 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -24,6 +24,7 @@
 #define LIBISCSI_H
 
 #include <linux/types.h>
+#include <linux/wait.h>
 #include <linux/mutex.h>
 #include <linux/timer.h>
 #include <linux/workqueue.h>
@@ -31,6 +32,7 @@
 #include <scsi/iscsi_if.h>
 
 struct scsi_transport_template;
+struct scsi_host_template;
 struct scsi_device;
 struct Scsi_Host;
 struct scsi_cmnd;
@@ -40,6 +42,7 @@ struct iscsi_cls_session;
 struct iscsi_cls_conn;
 struct iscsi_session;
 struct iscsi_nopin;
+struct device;
 
 /* #define DEBUG_SCSI */
 #ifdef DEBUG_SCSI
@@ -49,9 +52,7 @@ struct iscsi_nopin;
 #endif
 
 #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_ITT_OFFSET	0xa00
+#define ISCSI_MGMT_CMDS_MAX	15
 
 #define ISCSI_DEF_CMD_PER_LUN		32
 #define ISCSI_MAX_CMD_PER_LUN		128
@@ -69,7 +70,10 @@ enum {
 /* Connection suspend "bit" */
 #define ISCSI_SUSPEND_BIT		1
 
-#define ISCSI_ITT_MASK			(0xfff)
+#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)
 
@@ -82,18 +86,6 @@ enum {
 	ISCSI_DIGEST_SIZE = sizeof(__u32),
 };
 
-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 {
 	ISCSI_TASK_COMPLETED,
@@ -101,7 +93,7 @@ enum {
 	ISCSI_TASK_RUNNING,
 };
 
-struct iscsi_cmd_task {
+struct iscsi_task {
 	/*
 	 * Because LLDs allocate their hdr differently, this is a pointer
 	 * and length to that storage. It must be setup at session
@@ -118,6 +110,7 @@ struct iscsi_cmd_task {
 	/* 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*/
 	struct iscsi_conn	*conn;		/* used connection    */
 
@@ -128,9 +121,9 @@ struct iscsi_cmd_task {
 	void			*dd_data;	/* driver/transport data */
 };
 
-static inline void* iscsi_next_hdr(struct iscsi_cmd_task *ctask)
+static inline void* iscsi_next_hdr(struct iscsi_task *task)
 {
-	return (void*)ctask->hdr + ctask->hdr_len;
+	return (void*)task->hdr + task->hdr_len;
 }
 
 /* Connection's states */
@@ -146,11 +139,6 @@ struct iscsi_conn {
 	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;
@@ -159,7 +147,7 @@ struct iscsi_conn {
 	unsigned long		last_ping;
 	int			ping_timeout;
 	int			recv_timeout;
-	struct iscsi_mgmt_task	*ping_mtask;
+	struct iscsi_task 	*ping_task;
 
 	/* iSCSI connection-wide sequencing */
 	uint32_t		exp_statsn;
@@ -175,9 +163,8 @@ struct iscsi_conn {
 	 * 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 list_head	mgmtqueue;	/* mgmt (control) xmit queue */
@@ -208,9 +195,6 @@ struct iscsi_conn {
 	/* 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;
@@ -246,6 +230,7 @@ enum {
 };
 
 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
@@ -281,10 +266,8 @@ struct iscsi_session {
 	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;
@@ -298,12 +281,20 @@ struct iscsi_session {
 	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_task	**cmds;		/* Original Cmds arr */
 	struct iscsi_pool	cmdpool;	/* PDU's pool */
-	int			mgmtpool_max;	/* size of mgmt array */
-	struct iscsi_mgmt_task	**mgmt_cmds;	/* Original mgmt arr */
-	struct iscsi_pool	mgmtpool;	/* Mgmt 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];
 };
 
 /*
@@ -316,42 +307,44 @@ 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 *,
-		    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,		\
-		(struct iscsi_cls_session *)session_to_cls(_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);
@@ -360,25 +353,29 @@ extern int iscsi_conn_bind(struct iscsi_cls_session *, struct iscsi_cls_conn *,
 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, _c->cls_conn, 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 *,
+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_verify_itt(struct iscsi_conn *, struct iscsi_hdr *,
-			    uint32_t *);
-extern void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask);
-extern void iscsi_free_mgmt_task(struct iscsi_conn *conn,
-				 struct iscsi_mgmt_task *mtask);
+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 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
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 32742c4563de..00137a7769ee 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -9,6 +9,7 @@
 #define _SCSI_SCSI_H
 
 #include <linux/types.h>
+#include <scsi/scsi_cmnd.h>
 
 /*
  * The maximum number of SG segments that we will put inside a
@@ -400,6 +401,7 @@ struct scsi_lun {
 #define SOFT_ERROR      0x2005
 #define ADD_TO_MLQUEUE  0x2006
 #define TIMEOUT_ERROR   0x2007
+#define SCSI_RETURN_NOT_HANDLED   0x2008
 
 /*
  * Midlevel queue return values.
@@ -424,6 +426,22 @@ struct scsi_lun {
 #define driver_byte(result) (((result) >> 24) & 0xff)
 #define suggestion(result)  (driver_byte(result) & SUGGEST_MASK)
 
+static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
+{
+	cmd->result |= status << 8;
+}
+
+static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
+{
+	cmd->result |= status << 16;
+}
+
+static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
+{
+	cmd->result |= status << 24;
+}
+
+
 #define sense_class(sense)  (((sense) >> 4) & 0x7)
 #define sense_error(sense)  ((sense) & 0xf)
 #define sense_valid(sense)  ((sense) & 0x80);
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 3e46dfae8194..66c944849d6b 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -7,7 +7,6 @@
 #include <linux/types.h>
 #include <linux/timer.h>
 #include <linux/scatterlist.h>
-#include <linux/blkdev.h>
 
 struct Scsi_Host;
 struct scsi_device;
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 00b78763a1bf..6467f78b191f 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -162,9 +162,29 @@ struct scsi_device {
 
 	struct execute_work	ew; /* used to get process context on put */
 
+	struct scsi_dh_data	*scsi_dh_data;
 	enum scsi_device_state sdev_state;
 	unsigned long		sdev_data[0];
 } __attribute__((aligned(sizeof(unsigned long))));
+
+struct scsi_device_handler {
+	/* Used by the infrastructure */
+	struct list_head list; /* list of scsi_device_handlers */
+	struct notifier_block nb;
+
+	/* Filled by the hardware handler */
+	struct module *module;
+	const char *name;
+	int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
+	int (*activate)(struct scsi_device *);
+	int (*prep_fn)(struct scsi_device *, struct request *);
+};
+
+struct scsi_dh_data {
+	struct scsi_device_handler *scsi_dh;
+	char buf[0];
+};
+
 #define	to_scsi_device(d)	\
 	container_of(d, struct scsi_device, sdev_gendev)
 #define	class_to_sdev(d)	\
@@ -231,7 +251,9 @@ extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
 		uint, uint, uint, void *hostdata);
 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
 			   uint target, uint lun);
+extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 extern void scsi_remove_device(struct scsi_device *);
+extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 
 extern int scsi_device_get(struct scsi_device *);
 extern void scsi_device_put(struct scsi_device *);
diff --git a/include/scsi/scsi_dh.h b/include/scsi/scsi_dh.h
new file mode 100644
index 000000000000..3ad2303d1a16
--- /dev/null
+++ b/include/scsi/scsi_dh.h
@@ -0,0 +1,69 @@
+/*
+ * Header file for SCSI device handler infrastruture.
+ *
+ * Modified version of patches posted by Mike Christie <michaelc@cs.wisc.edu>
+ *
+ * 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.
+ *
+ * Copyright IBM Corporation, 2007
+ *      Authors:
+ *               Chandra Seetharaman <sekharan@us.ibm.com>
+ *               Mike Anderson <andmike@linux.vnet.ibm.com>
+ */
+
+#include <scsi/scsi_device.h>
+
+enum {
+	SCSI_DH_OK = 0,
+	/*
+	 * device errors
+	 */
+	SCSI_DH_DEV_FAILED,	/* generic device error */
+	SCSI_DH_DEV_TEMP_BUSY,
+	SCSI_DH_DEVICE_MAX,	/* max device blkerr definition */
+
+	/*
+	 * transport errors
+	 */
+	SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1,
+	SCSI_DH_CONN_FAILURE,
+	SCSI_DH_TRANSPORT_MAX,	/* max transport blkerr definition */
+
+	/*
+	 * driver and generic errors
+	 */
+	SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1,	/* generic error */
+	SCSI_DH_INVALID_IO,
+	SCSI_DH_RETRY,		/* retry the req, but not immediately */
+	SCSI_DH_IMM_RETRY,	/* immediately retry the req */
+	SCSI_DH_TIMED_OUT,
+	SCSI_DH_RES_TEMP_UNAVAIL,
+	SCSI_DH_DEV_OFFLINED,
+	SCSI_DH_NOSYS,
+	SCSI_DH_DRIVER_MAX,
+};
+#if defined(CONFIG_SCSI_DH) || defined(CONFIG_SCSI_DH_MODULE)
+extern int scsi_dh_activate(struct request_queue *);
+extern int scsi_dh_handler_exist(const char *);
+#else
+static inline int scsi_dh_activate(struct request_queue *req)
+{
+	return 0;
+}
+static inline int scsi_dh_handler_exist(const char *name)
+{
+	return 0;
+}
+#endif
diff --git a/include/scsi/scsi_transport_iscsi.h b/include/scsi/scsi_transport_iscsi.h
index aab1eae2ec4c..f5444e033cc9 100644
--- a/include/scsi/scsi_transport_iscsi.h
+++ b/include/scsi/scsi_transport_iscsi.h
@@ -30,11 +30,11 @@
 
 struct scsi_transport_template;
 struct iscsi_transport;
+struct iscsi_endpoint;
 struct Scsi_Host;
 struct iscsi_cls_conn;
 struct iscsi_conn;
-struct iscsi_cmd_task;
-struct iscsi_mgmt_task;
+struct iscsi_task;
 struct sockaddr;
 
 /**
@@ -58,19 +58,22 @@ struct sockaddr;
  * @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
- * @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
+ * @init_task:		Initialize a iscsi_task and any internal structs.
+ *			When offloading the data path, this is called from
+ *			queuecommand with the session lock, or from the
+ *			iscsi_conn_send_pdu context with the session lock.
+ *			When not offloading the data path, this is called
+ *			from the scsi work queue without the session lock.
+ * @xmit_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
+ *			value on error. When offloading the data path, this
+ *			is called from queuecommand with the session lock, or
+ *			from the iscsi_conn_send_pdu context with the session
+ *			lock. When not offloading the data path, this is called
+ *			from the scsi work queue without the session lock.
+ * @cleanup_task:	requests LLD to fail task. Called with session lock
+ *			and 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
  *
@@ -83,17 +86,9 @@ struct iscsi_transport {
 	/* LLD sets this to indicate what values it can export to sysfs */
 	uint64_t param_mask;
 	uint64_t host_param_mask;
-	struct scsi_host_template *host_template;
-	/* 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 iscsi_transport *it,
-		struct scsi_transport_template *t, uint16_t, uint16_t,
-		uint32_t sn, uint32_t *hn);
+	struct iscsi_cls_session *(*create_session) (struct iscsi_endpoint *ep,
+					uint16_t cmds_max, uint16_t qdepth,
+					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);
@@ -118,20 +113,15 @@ struct iscsi_transport {
 			 char *data, uint32_t data_size);
 	void (*get_stats) (struct iscsi_cls_conn *conn,
 			   struct iscsi_stats *stats);
-	int (*init_cmd_task) (struct iscsi_cmd_task *ctask);
-	void (*init_mgmt_task) (struct iscsi_conn *conn,
-				struct iscsi_mgmt_task *mtask);
-	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);
+	int (*init_task) (struct iscsi_task *task);
+	int (*xmit_task) (struct iscsi_task *task);
+	void (*cleanup_task) (struct iscsi_conn *conn,
+				  struct iscsi_task *task);
 	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);
+	struct iscsi_endpoint *(*ep_connect) (struct sockaddr *dst_addr,
+					      int non_blocking);
+	int (*ep_poll) (struct iscsi_endpoint *ep, int timeout_ms);
+	void (*ep_disconnect) (struct iscsi_endpoint *ep);
 	int (*tgt_dscvr) (struct Scsi_Host *shost, enum iscsi_tgt_dscvr type,
 			  uint32_t enable, struct sockaddr *dst_addr);
 };
@@ -172,9 +162,10 @@ enum {
 	ISCSI_SESSION_FREE,
 };
 
+#define ISCSI_MAX_TARGET -1
+
 struct iscsi_cls_session {
 	struct list_head sess_list;		/* item in session_list */
-	struct list_head host_list;
 	struct iscsi_transport *transport;
 	spinlock_t lock;
 	struct work_struct block_work;
@@ -186,7 +177,7 @@ struct iscsi_cls_session {
 	int recovery_tmo;
 	struct delayed_work recovery_work;
 
-	int target_id;
+	unsigned int target_id;
 
 	int state;
 	int sid;				/* session id */
@@ -203,14 +194,22 @@ struct iscsi_cls_session {
 #define starget_to_session(_stgt) \
 	iscsi_dev_to_session(_stgt->dev.parent)
 
-struct iscsi_host {
-	struct list_head sessions;
+struct iscsi_cls_host {
 	atomic_t nr_scans;
 	struct mutex mutex;
 	struct workqueue_struct *scan_workq;
 	char scan_workq_name[KOBJ_NAME_LEN];
 };
 
+extern void iscsi_host_for_each_session(struct Scsi_Host *shost,
+				void (*fn)(struct iscsi_cls_session *));
+
+struct iscsi_endpoint {
+	void *dd_data;			/* LLD private data */
+	struct device dev;
+	unsigned int id;
+};
+
 /*
  * session and connection functions that can be used by HW iSCSI LLDs
  */
@@ -222,22 +221,26 @@ struct iscsi_host {
 
 extern int iscsi_session_chkready(struct iscsi_cls_session *session);
 extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
-					struct iscsi_transport *transport);
+				struct iscsi_transport *transport, int dd_size);
 extern int iscsi_add_session(struct iscsi_cls_session *session,
 			     unsigned int target_id);
 extern int iscsi_session_event(struct iscsi_cls_session *session,
 			       enum iscsi_uevent_e event);
 extern struct iscsi_cls_session *iscsi_create_session(struct Scsi_Host *shost,
 						struct iscsi_transport *t,
+						int dd_size,
 						unsigned int target_id);
 extern void iscsi_remove_session(struct iscsi_cls_session *session);
 extern void iscsi_free_session(struct iscsi_cls_session *session);
 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);
+						int dd_size, uint32_t cid);
 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);
 extern int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time);
+extern struct iscsi_endpoint *iscsi_create_endpoint(int dd_size);
+extern void iscsi_destroy_endpoint(struct iscsi_endpoint *ep);
+extern struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle);
 
 #endif
diff --git a/include/scsi/sd.h b/include/scsi/sd.h
deleted file mode 100644
index 4f032d48cb6e..000000000000
--- a/include/scsi/sd.h
+++ /dev/null
@@ -1,57 +0,0 @@
-#ifndef _SCSI_DISK_H
-#define _SCSI_DISK_H
-
-/*
- * More than enough for everybody ;)  The huge number of majors
- * is a leftover from 16bit dev_t days, we don't really need that
- * much numberspace.
- */
-#define SD_MAJORS	16
-
-/*
- * This is limited by the naming scheme enforced in sd_probe,
- * add another character to it if you really need more disks.
- */
-#define SD_MAX_DISKS	(((26 * 26) + 26 + 1) * 26)
-
-/*
- * Time out in seconds for disks and Magneto-opticals (which are slower).
- */
-#define SD_TIMEOUT		(30 * HZ)
-#define SD_MOD_TIMEOUT		(75 * HZ)
-
-/*
- * Number of allowed retries
- */
-#define SD_MAX_RETRIES		5
-#define SD_PASSTHROUGH_RETRIES	1
-
-/*
- * Size of the initial data buffer for mode and read capacity data
- */
-#define SD_BUF_SIZE		512
-
-struct scsi_disk {
-	struct scsi_driver *driver;	/* always &sd_template */
-	struct scsi_device *device;
-	struct device	dev;
-	struct gendisk	*disk;
-	unsigned int	openers;	/* protected by BKL for now, yuck */
-	sector_t	capacity;	/* size in 512-byte sectors */
-	u32		index;
-	u8		media_present;
-	u8		write_prot;
-	unsigned	previous_state : 1;
-	unsigned	WCE : 1;	/* state of disk WCE bit */
-	unsigned	RCD : 1;	/* state of disk RCD bit, unused */
-	unsigned	DPOFUA : 1;	/* state of disk DPOFUA bit */
-};
-#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,dev)
-
-#define sd_printk(prefix, sdsk, fmt, a...)				\
-        (sdsk)->disk ?							\
-	sdev_printk(prefix, (sdsk)->device, "[%s] " fmt,		\
-		    (sdsk)->disk->disk_name, ##a) :			\
-	sdev_printk(prefix, (sdsk)->device, fmt, ##a)
-
-#endif /* _SCSI_DISK_H */
diff --git a/include/scsi/sg.h b/include/scsi/sg.h
index 519c49a0fc11..934ae389671d 100644
--- a/include/scsi/sg.h
+++ b/include/scsi/sg.h
@@ -206,6 +206,7 @@ typedef struct sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */
 #define		SG_SCSI_RESET_DEVICE	1
 #define		SG_SCSI_RESET_BUS	2
 #define		SG_SCSI_RESET_HOST	3
+#define		SG_SCSI_RESET_TARGET	4
 
 /* synchronous SCSI command ioctl, (only in version 3 interface) */
 #define SG_IO 0x2285   /* similar effect as write() followed by read() */