[ANNOUNCE 2/7] Open-iSCSI/Linux-iSCSI-5 High-Performance Initiator: iscsi-tcp.h.patch

[Alex Aizman <itn780@yahoo.com>]

	iscsi-tcp.h.patch - drivers/scsi/iscsi_tcp.h, header file.

	Signed-off-by: Alex Aizman <itn780@yahoo.com>
	Signed-off-by: Dmitry Yusupov <dmitry_yus@yahoo.com>
	Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>

Index: drivers/scsi/iscsi_tcp.h
===================================================================
--- /dev/null  (tree:7570fde464d579ce455c865f07a613e967e9396c)
+++ uncommitted/drivers/scsi/iscsi_tcp.h  (mode:100644 sha1:82dcf8dada8e223e55acec92f54eb2473460d086)
@@ -0,0 +1,291 @@
+/*
+ * iSCSI Initiator TCP Transport
+ * Copyright (C) 2004 Dmitry Yusupov, Alex Aizman
+ * maintained by open-iscsi@googlegroups.com
+ *
+ * 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.
+ *
+ * See the file COPYING included with this distribution for more details.
+ */
+
+#ifndef ISCSI_TCP_H
+#define ISCSI_TCP_H
+
+#include <scsi/scsi_transport_iscsi.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_CNX_INITIAL_STAGE		0
+#define ISCSI_CNX_STARTED		1
+#define ISCSI_CNX_STOPPED		2
+#define ISCSI_CNX_CLEANUP_WAIT		3
+
+/* Socket's Receive state machine */
+#define IN_PROGRESS_WAIT_HEADER		0x0
+#define IN_PROGRESS_HEADER_GATHER	0x1
+#define IN_PROGRESS_DATA_RECV		0x2
+
+/* Task Mgmt states */
+#define	TMABORT_INITIAL			0x0
+#define	TMABORT_SUCCESS			0x1
+#define	TMABORT_FAILED			0x2
+#define	TMABORT_TIMEDOUT		0x3
+
+/* iSCSI Task Command's state machine */
+#define IN_PROGRESS_IDLE		0x0
+#define IN_PROGRESS_READ		0x1
+#define IN_PROGRESS_WRITE		0x2
+
+/* xmit state machine */
+#define	XMSTATE_IDLE			0x0
+#define	XMSTATE_R_HDR			0x1
+#define	XMSTATE_W_HDR			0x2
+#define	XMSTATE_IMM_HDR			0x4
+#define	XMSTATE_IMM_DATA		0x8
+#define	XMSTATE_UNS_INIT		0x10
+#define	XMSTATE_UNS_HDR			0x20
+#define	XMSTATE_UNS_DATA		0x40
+#define	XMSTATE_SOL_HDR			0x80
+#define	XMSTATE_SOL_DATA		0x100
+#define	XMSTATE_W_PAD			0x200
+
+#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	0x1000
+#define ISCSI_SG_TABLESIZE	SG_ALL
+#define ISCSI_CMD_PER_LUN	128
+#define ISCSI_TCP_MAX_LUN	256
+#define ISCSI_TCP_MAX_CMD_LEN	16
+
+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;
+
+/* Socket connection recieve helper */
+struct iscsi_tcp_recv {
+	struct iscsi_hdr	*hdr;
+	struct sk_buff		*skb;
+	int			offset;
+	int			len;
+	int			hdr_offset;
+	int			copy;
+	int			copied;
+	int			padding;
+	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;
+};
+
+struct iscsi_conn {
+	struct iscsi_hdr	hdr;		/* Header placeholder */
+	char			hdrext[4*sizeof(__u16) +
+				    sizeof(__u32)];
+	char			*data;		/* Data placeholder */
+	int			data_copied;
+
+	/* iSCSI connection-wide sequencing */
+	uint32_t		exp_statsn;
+	int			hdr_size;	/* PDU Header size pre-calc. */
+
+	/* control data */
+	int			senselen;	/* is data has sense? */
+	int			cpu;		/* binded CPU */
+	int			busy;
+	int			id;		/* iSCSI CID */
+	struct iscsi_tcp_recv	in;		/* TCP receive context */
+	int			in_progress;	/* Connection state machine */
+	struct socket           *sock;          /* BSD socket layer */
+	struct iscsi_session	*session;	/* Parent session */
+	struct list_head	item;		/* item's list of connections */
+	struct kfifo		*writequeue;	/* Write response xmit queue */
+	struct kfifo		*immqueue;	/* Immediate xmit queue */
+	struct kfifo		*mgmtqueue;	/* Mgmt xmit queue */
+	struct kfifo		*xmitqueue;	/* Data-path queue */
+	struct work_struct	xmitwork;	/* per-conn. xmit workqueue */
+	volatile int		c_stage;	/* Connection state */
+	struct iscsi_mgmt_task	*login_mtask;	/* mtask used for login/text */
+	spinlock_t		lock;		/* general connection lock */
+	volatile int		suspend;	/* connection suspended */
+	struct crypto_tfm	*tx_tfm;
+	struct crypto_tfm	*rx_tfm;
+	struct iscsi_mgmt_task	*mtask;		/* xmit mtask in progress */
+	struct iscsi_cmd_task	*ctask;		/* xmit ctask in progress */
+	struct semaphore	xmitsema;
+	wait_queue_head_t	ehwait;
+	struct iscsi_tm		tmhdr;
+	volatile int		tmabort_state;
+	struct timer_list	tmabort_timer;
+	volatile int		stop_stage;	/* cnx_stop() state machine */
+	int			data_size;	/* actual recv_dlength size */
+
+	/* configuration */
+	int			max_recv_dlength;
+	int			max_xmit_dlength;
+	int			hdrdgst_en;
+	int			datadgst_en;
+
+	/* old values for socket callbacks */
+	void			(*old_data_ready)(struct sock *, int);
+	void			(*old_state_change)(struct sock *);
+	void			(*old_write_space)(struct sock *);
+
+	/* 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		sendpage_failures_cnt;
+	uint32_t		discontiguous_hdr_cnt;
+};
+
+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 Conn. */
+	spinlock_t		conn_lock;
+	spinlock_t		lock;
+	volatile int		state;
+	struct list_head	item;
+	void			*auth_client;
+	int			conn_cnt;
+	volatile int		generation;
+
+	struct list_head	connections;	/* list of connects. */
+	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;
+};
+
+struct iscsi_data_task {
+	struct iscsi_data	hdr;			/* PDU */
+	char			hdrext[sizeof(__u32)];	/* Header-Digest */
+	struct list_head	item;			/* data queue item */
+};
+#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 */
+	volatile 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 {
+	__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 */
+	struct iscsi_buf	headbuf;	/* Data-Out Header Buffer */
+	struct iscsi_buf	sendbuf;	/* Data-Out in progress buffer*/
+	int			sent;		/* R2T sequence progress */
+	int			data_count;	/* DATA-Out payload progress */
+	struct scatterlist	*sg;		/* per-R2T SG list */
+	int			solicit_datasn;
+};
+
+struct iscsi_cmd_task {
+	struct iscsi_cmd	hdr;			/* orig. SCSI PDU */
+	char			hdrext[4*sizeof(__u16)+	/* one AHS */
+				    sizeof(__u32)];	/* Header-Digest */
+	char			pad[ISCSI_PAD_LEN];
+	int			itt;			/* this ITT */
+	int			datasn;			/* DataSN numbering */
+	struct iscsi_buf	headbuf;		/* Header Buffer */
+	struct iscsi_buf	sendbuf;		/* in progress buffer */
+	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;
+	volatile int		in_progress;		/* State machine */
+	volatile int		xmstate;		/* Xmit State machine */
+	int			imm_count;		/* Imm-Data bytes */
+	int			unsol_count;		/* Imm-Data-Out bytes */
+	int			r2t_data_count;		/* R2T Data-Out bytes */
+	int			data_count;		/* Remaining Data-Out */
+	int			pad_count;		/* Padded bytes */
+	struct scsi_cmnd	*sc;			/* Assoc. SCSI cmnd */
+	int			total_length;
+	int			data_offset;
+	struct iscsi_conn	*conn;			/* used connection */
+
+	struct iscsi_r2t_info	*r2t;			/* in progress R2T */
+	struct iscsi_queue	r2tpool;
+	struct kfifo		*r2tqueue;
+	struct iscsi_r2t_info	**r2ts;
+	struct list_head	dataqueue;		/* Data-Out dataqueue */
+	mempool_t		*datapool;
+};
+
+#endif /* ISCSI_H */