[SCSI] iscsi: convert iscsi tcp to libiscsi

This just converts iscsi_tcp to the lib
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/iscsi_tcp.h

@@ -2,7 +2,8 @@
  * iSCSI Initiator TCP Transport
  * Copyright (C) 2004 Dmitry Yusupov
  * Copyright (C) 2004 Alex Aizman
- * Copyright (C) 2005 Mike Christie
+ * Copyright (C) 2005 - 2006 Mike Christie
+ * Copyright (C) 2006 Red Hat, Inc.  All rights reserved.
  * maintained by open-iscsi@googlegroups.com
  *
  * This program is free software; you can redistribute it and/or modify
@@ -21,20 +22,7 @@
 #ifndef ISCSI_TCP_H
 #define ISCSI_TCP_H
 
-/* Session's states */
-#define ISCSI_STATE_FREE		1
-#define ISCSI_STATE_LOGGED_IN		2
-#define ISCSI_STATE_FAILED		3
-#define ISCSI_STATE_TERMINATE		4
-
-/* 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
-
-/* Connection suspend "bit" */
-#define SUSPEND_BIT			1
+#include <scsi/libiscsi.h>
 
 /* Socket's Receive state machine */
 #define IN_PROGRESS_WAIT_HEADER		0x0
@@ -42,12 +30,6 @@
 #define IN_PROGRESS_DATA_RECV		0x2
 #define IN_PROGRESS_DDIGEST_RECV	0x3
 
-/* Task Mgmt states */
-#define	TMABORT_INITIAL			0x0
-#define	TMABORT_SUCCESS			0x1
-#define	TMABORT_FAILED			0x2
-#define	TMABORT_TIMEDOUT		0x3
-
 /* xmit state machine */
 #define	XMSTATE_IDLE			0x0
 #define	XMSTATE_R_HDR			0x1
@@ -62,34 +44,14 @@
 #define	XMSTATE_W_PAD			0x200
 #define XMSTATE_DATA_DIGEST		0x400
 
-#define ISCSI_CONN_MAX			1
 #define ISCSI_CONN_RCVBUF_MIN		262144
 #define ISCSI_CONN_SNDBUF_MIN		262144
 #define ISCSI_PAD_LEN			4
 #define ISCSI_R2T_MAX			16
-#define ISCSI_XMIT_CMDS_MAX		128	/* must be power of 2 */
-#define ISCSI_MGMT_CMDS_MAX		32	/* must be power of 2 */
-#define ISCSI_MGMT_ITT_OFFSET		0xa00
 #define ISCSI_SG_TABLESIZE		SG_ALL
-#define ISCSI_DEF_CMD_PER_LUN		32
-#define ISCSI_MAX_CMD_PER_LUN		128
 #define ISCSI_TCP_MAX_CMD_LEN		16
 
-#define ITT_MASK			(0xfff)
-#define CID_SHIFT			12
-#define CID_MASK			(0xffff<<CID_SHIFT)
-#define AGE_SHIFT			28
-#define AGE_MASK			(0xf<<AGE_SHIFT)
-
-struct iscsi_queue {
-	struct kfifo		*queue;		/* FIFO Queue */
-	void			**pool;		/* Pool of elements */
-	int			max;		/* Max number of elements */
-};
-
-struct iscsi_session;
-struct iscsi_cmd_task;
-struct iscsi_mgmt_task;
+struct socket;
 
 /* Socket connection recieve helper */
 struct iscsi_tcp_recv {
@@ -104,48 +66,32 @@ struct iscsi_tcp_recv {
 	struct iscsi_cmd_task	*ctask;		/* current cmd in progress */
 
 	/* copied and flipped values */
-	int			opcode;
-	int			flags;
-	int			cmd_status;
-	int			ahslen;
 	int			datalen;
-	uint32_t		itt;
 	int			datadgst;
+	char			zero_copy_hdr;
 };
 
-struct iscsi_cls_conn;
-
-struct iscsi_conn {
-	struct iscsi_cls_conn	*cls_conn;	/* ptr to class connection */
+struct iscsi_tcp_conn {
+	struct iscsi_conn	*iscsi_conn;
+	struct socket		*sock;
 	struct iscsi_hdr	hdr;		/* header placeholder */
 	char			hdrext[4*sizeof(__u16) +
 				    sizeof(__u32)];
 	int			data_copied;
 	char			*data;		/* data placeholder */
-	struct socket           *sock;          /* TCP socket */
 	int			data_size;	/* actual recv_dlength */
 	int			stop_stage;	/* conn_stop() flag: *
 						 * stop to recover,  *
 						 * stop to terminate */
 	/* iSCSI connection-wide sequencing */
-	uint32_t		exp_statsn;
 	int			hdr_size;	/* PDU header size */
-	unsigned long		suspend_rx;	/* suspend Rx */
 
 	struct crypto_tfm	*rx_tfm;	/* CRC32C (Rx) */
 	struct crypto_tfm	*data_rx_tfm;	/* CRC32C (Rx) for data */
 
 	/* control data */
-	int			senselen;	/* scsi sense length */
-	int			id;		/* CID */
 	struct iscsi_tcp_recv	in;		/* TCP receive context */
-	struct iscsi_session	*session;	/* parent session */
-	struct list_head	item;		/* maintains list of conns */
 	int			in_progress;	/* connection state machine */
-	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 */
 
 	/* old values for socket callbacks */
 	void			(*old_data_ready)(struct sock *, int);
@@ -155,95 +101,14 @@ struct iscsi_conn {
 	/* xmit */
 	struct crypto_tfm	*tx_tfm;	/* CRC32C (Tx) */
 	struct crypto_tfm	*data_tx_tfm;	/* CRC32C (Tx) for data */
-	struct kfifo		*writequeue;	/* write cmds for Data-Outs */
-	struct kfifo		*immqueue;	/* immediate xmit queue */
-	struct kfifo		*mgmtqueue;	/* mgmt (control) xmit queue */
-	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 */
-	struct mutex		xmitmutex;	/* serializes connection xmit,
-						 * access to kfifos:	  *
-						 * xmitqueue, writequeue, *
-						 * immqueue, mgmtqueue    */
-	unsigned long		suspend_tx;	/* suspend Tx */
-
-	/* abort */
-	wait_queue_head_t	ehwait;		/* used in eh_abort()     */
-	struct iscsi_tm		tmhdr;
-	struct timer_list	tmabort_timer;  /* abort timer */
-	int			tmabort_state;  /* see TMABORT_INITIAL, etc.*/
-
-	/* negotiated params */
-	int			max_recv_dlength;
-	int			max_xmit_dlength;
-	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 */
+	/* MIB custom statistics */
 	uint32_t		sendpage_failures_cnt;
 	uint32_t		discontiguous_hdr_cnt;
-	uint32_t		eh_abort_cnt;
 
 	ssize_t (*sendpage)(struct socket *, struct page *, int, size_t, int);
 };
 
-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 Scsi_Host	*host;
-	int			id;
-	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;
-	void			*auth_client;
-	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 */
-};
-
 struct iscsi_buf {
 	struct scatterlist	sg;
 	unsigned int		sent;
@@ -259,16 +124,13 @@ struct iscsi_data_task {
 };
 #define ISCSI_DTASK_DEFAULT_MAX	ISCSI_SG_TABLESIZE * PAGE_SIZE / 512
 
-struct iscsi_mgmt_task {
-	struct iscsi_hdr	hdr;		/* mgmt. PDU */
-	char			hdrext[sizeof(__u32)];	/* Header-Digest */
-	char			*data;		/* mgmt payload */
+struct iscsi_tcp_mgmt_task {
+	struct iscsi_hdr	hdr;
+	char			hdrext[sizeof(__u32)]; /* Header-Digest */
 	int			xmstate;	/* mgmt xmit progress */
-	int			data_count;	/* counts data to be sent */
 	struct iscsi_buf	headbuf;	/* header buffer */
 	struct iscsi_buf	sendbuf;	/* in progress buffer */
 	int			sent;
-	uint32_t		itt;		/* this ITT */
 };
 
 struct iscsi_r2t_info {
@@ -285,34 +147,22 @@ struct iscsi_r2t_info {
 	struct iscsi_data_task   *dtask;        /* which data task */
 };
 
-struct iscsi_cmd_task {
-	struct iscsi_cmd	hdr;			/* iSCSI PDU header */
+struct iscsi_tcp_cmd_task {
+	struct iscsi_cmd	hdr;
 	char			hdrext[4*sizeof(__u16)+	/* AHS */
 				    sizeof(__u32)];	/* HeaderDigest */
 	char			pad[ISCSI_PAD_LEN];
-	int			itt;			/* this ITT */
-	int			datasn;			/* DataSN */
+	int			pad_count;		/* padded bytes */
 	struct iscsi_buf	headbuf;		/* header buf (xmit) */
 	struct iscsi_buf	sendbuf;		/* in progress buffer*/
+	int			xmstate;		/* xmit xtate machine */
 	int			sent;
 	struct scatterlist	*sg;			/* per-cmd SG list  */
 	struct scatterlist	*bad_sg;		/* assert statement */
 	int			sg_count;		/* SG's to process  */
-	uint32_t		unsol_datasn;
 	uint32_t		exp_r2tsn;
-	int			xmstate;		/* xmit xtate machine */
-	int			imm_count;		/* imm-data (bytes)   */
-	int			unsol_count;		/* unsolicited (bytes)*/
 	int			r2t_data_count;		/* R2T Data-Out bytes */
-	int			data_count;		/* remaining Data-Out */
-	int			pad_count;		/* padded bytes */
-	struct scsi_cmnd	*sc;			/* associated SCSI cmd*/
-	int			total_length;
 	int			data_offset;
-	struct iscsi_conn	*conn;			/* used connection    */
-	struct iscsi_mgmt_task	*mtask;			/* tmf mtask in progr */
-
-	struct list_head	running;		/* running cmd list */
 	struct iscsi_r2t_info	*r2t;			/* in progress R2T    */
 	struct iscsi_queue	r2tpool;
 	struct kfifo		*r2tqueue;