[linux-block.git] / drivers / infiniband / ulp / iser / iscsi_iser.h

/*
 * iSER transport for the Open iSCSI Initiator & iSER transport internals
 *
 * Copyright (C) 2004 Dmitry Yusupov
 * Copyright (C) 2004 Alex Aizman
 * Copyright (C) 2005 Mike Christie
 * based on code maintained by open-iscsi@googlegroups.com
 *
 * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
 * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *	- Redistributions of source code must retain the above
 *	  copyright notice, this list of conditions and the following
 *	  disclaimer.
 *
 *	- Redistributions in binary form must reproduce the above
 *	  copyright notice, this list of conditions and the following
 *	  disclaimer in the documentation and/or other materials
 *	  provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: iscsi_iser.h 7051 2006-05-10 12:29:11Z ogerlitz $
 */
#ifndef __ISCSI_ISER_H__
#define __ISCSI_ISER_H__

#include <linux/types.h>
#include <linux/net.h>
#include <scsi/libiscsi.h>
#include <scsi/scsi_transport_iscsi.h>

#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/mutex.h>
#include <linux/mempool.h>
#include <linux/uio.h>

#include <linux/socket.h>
#include <linux/in.h>
#include <linux/in6.h>

#include <rdma/ib_verbs.h>
#include <rdma/ib_fmr_pool.h>
#include <rdma/rdma_cm.h>

#define DRV_NAME	"iser"
#define PFX		DRV_NAME ": "
#define DRV_VER		"0.1"
#define DRV_DATE	"May 7th, 2006"

#define iser_dbg(fmt, arg...)				\
	do {						\
		if (iser_debug_level > 1)		\
			printk(KERN_DEBUG PFX "%s:" fmt,\
				__func__ , ## arg);	\
	} while (0)

#define iser_warn(fmt, arg...)				\
	do {						\
		if (iser_debug_level > 0)		\
			printk(KERN_DEBUG PFX "%s:" fmt,\
				__func__ , ## arg);	\
	} while (0)

#define iser_err(fmt, arg...)				\
	do {						\
		printk(KERN_ERR PFX "%s:" fmt,          \
		       __func__ , ## arg);		\
	} while (0)

#define SHIFT_4K	12
#define SIZE_4K	(1UL << SHIFT_4K)
#define MASK_4K	(~(SIZE_4K-1))

					/* support upto 512KB in one RDMA */
#define ISCSI_ISER_SG_TABLESIZE         (0x80000 >> SHIFT_4K)
#define ISCSI_ISER_MAX_LUN		256

/* QP settings */
/* Maximal bounds on received asynchronous PDUs */
#define ISER_MAX_RX_MISC_PDUS		4 /* NOOP_IN(2) , ASYNC_EVENT(2)   */

#define ISER_MAX_TX_MISC_PDUS		6 /* NOOP_OUT(2), TEXT(1),         *
					   * SCSI_TMFUNC(2), LOGOUT(1) */

#define ISER_QP_MAX_RECV_DTOS		(ISCSI_DEF_XMIT_CMDS_MAX + \
					ISER_MAX_RX_MISC_PDUS    +  \
					ISER_MAX_TX_MISC_PDUS)

/* the max TX (send) WR supported by the iSER QP is defined by                 *
 * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect   *
 * to have at max for SCSI command. The tx posting & completion handling code  *
 * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
 * send WR. D=8 comes from 64K/8K                                              */

#define ISER_INFLIGHT_DATAOUTS		8

#define ISER_QP_MAX_REQ_DTOS		(ISCSI_DEF_XMIT_CMDS_MAX *    \
					(1 + ISER_INFLIGHT_DATAOUTS) + \
					ISER_MAX_TX_MISC_PDUS        + \
					ISER_MAX_RX_MISC_PDUS)

#define ISER_VER			0x10
#define ISER_WSV			0x08
#define ISER_RSV			0x04

struct iser_hdr {
	u8      flags;
	u8      rsvd[3];
	__be32  write_stag; /* write rkey */
	__be64  write_va;
	__be32  read_stag;  /* read rkey */
	__be64  read_va;
} __attribute__((packed));


/* Length of an object name string */
#define ISER_OBJECT_NAME_SIZE		    64

enum iser_ib_conn_state {
	ISER_CONN_INIT,		   /* descriptor allocd, no conn          */
	ISER_CONN_PENDING,	   /* in the process of being established */
	ISER_CONN_UP,		   /* up and running                      */
	ISER_CONN_TERMINATING,	   /* in the process of being terminated  */
	ISER_CONN_DOWN,		   /* shut down                           */
	ISER_CONN_STATES_NUM
};

enum iser_task_status {
	ISER_TASK_STATUS_INIT = 0,
	ISER_TASK_STATUS_STARTED,
	ISER_TASK_STATUS_COMPLETED
};

enum iser_data_dir {
	ISER_DIR_IN = 0,	   /* to initiator */
	ISER_DIR_OUT,		   /* from initiator */
	ISER_DIRS_NUM
};

struct iser_data_buf {
	void               *buf;      /* pointer to the sg list               */
	unsigned int       size;      /* num entries of this sg               */
	unsigned long      data_len;  /* total data len                       */
	unsigned int       dma_nents; /* returned by dma_map_sg               */
	char       	   *copy_buf; /* allocated copy buf for SGs unaligned *
	                               * for rdma which are copied            */
	struct scatterlist sg_single; /* SG-ified clone of a non SG SC or     *
				       * unaligned SG                         */
  };

/* fwd declarations */
struct iser_device;
struct iscsi_iser_conn;
struct iscsi_iser_cmd_task;

struct iser_mem_reg {
	u32  lkey;
	u32  rkey;
	u64  va;
	u64  len;
	void *mem_h;
	int  is_fmr;
};

struct iser_regd_buf {
	struct iser_mem_reg     reg;        /* memory registration info        */
	void                    *virt_addr;
	struct iser_device      *device;    /* device->device for dma_unmap    */
	u64                     dma_addr;   /* if non zero, addr for dma_unmap */
	enum dma_data_direction direction;  /* direction for dma_unmap	       */
	unsigned int            data_size;
	atomic_t                ref_count;  /* refcount, freed when dec to 0   */
};

#define MAX_REGD_BUF_VECTOR_LEN	2

struct iser_dto {
	struct iscsi_iser_cmd_task *ctask;
	struct iser_conn *ib_conn;
	int                        notify_enable;

	/* vector of registered buffers */
	unsigned int               regd_vector_len;
	struct iser_regd_buf       *regd[MAX_REGD_BUF_VECTOR_LEN];

	/* offset into the registered buffer may be specified */
	unsigned int               offset[MAX_REGD_BUF_VECTOR_LEN];

	/* a smaller size may be specified, if 0, then full size is used */
	unsigned int               used_sz[MAX_REGD_BUF_VECTOR_LEN];
};

enum iser_desc_type {
	ISCSI_RX,
	ISCSI_TX_CONTROL ,
	ISCSI_TX_SCSI_COMMAND,
	ISCSI_TX_DATAOUT
};

struct iser_desc {
	struct iser_hdr              iser_header;
	struct iscsi_hdr             iscsi_header;
	struct iser_regd_buf         hdr_regd_buf;
	void                         *data;         /* used by RX & TX_CONTROL */
	struct iser_regd_buf         data_regd_buf; /* used by RX & TX_CONTROL */
	enum   iser_desc_type        type;
	struct iser_dto              dto;
};

struct iser_device {
	struct ib_device             *ib_device;
	struct ib_pd	             *pd;
	struct ib_cq	             *cq;
	struct ib_mr	             *mr;
	struct tasklet_struct	     cq_tasklet;
	struct list_head             ig_list; /* entry in ig devices list */
	int                          refcount;
};

struct iser_conn {
	struct iscsi_iser_conn       *iser_conn; /* iser conn for upcalls  */
	enum iser_ib_conn_state	     state;	    /* rdma connection state   */
	atomic_t		     refcount;
	spinlock_t		     lock;	    /* used for state changes  */
	struct iser_device           *device;       /* device context          */
	struct rdma_cm_id            *cma_id;       /* CMA ID		       */
	struct ib_qp	             *qp;           /* QP 		       */
	struct ib_fmr_pool           *fmr_pool;     /* pool of IB FMRs         */
	int                          disc_evt_flag; /* disconn event delivered */
	wait_queue_head_t	     wait;          /* waitq for conn/disconn  */
	atomic_t                     post_recv_buf_count; /* posted rx count   */
	atomic_t                     post_send_buf_count; /* posted tx count   */
	char 			     name[ISER_OBJECT_NAME_SIZE];
	struct iser_page_vec         *page_vec;     /* represents SG to fmr maps*
						     * maps serialized as tx is*/
	struct list_head	     conn_list;       /* entry in ig conn list */
};

struct iscsi_iser_conn {
	struct iscsi_conn            *iscsi_conn;/* ptr to iscsi conn */
	struct iser_conn             *ib_conn;   /* iSER IB conn      */

	rwlock_t		     lock;
};

struct iscsi_iser_cmd_task {
	struct iser_desc             desc;
	struct iscsi_iser_conn	     *iser_conn;
	enum iser_task_status 	     status;
	int                          command_sent;  /* set if command  sent  */
	int                          dir[ISER_DIRS_NUM];      /* set if dir use*/
	struct iser_regd_buf         rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
	struct iser_data_buf         data[ISER_DIRS_NUM];     /* orig. data des*/
	struct iser_data_buf         data_copy[ISER_DIRS_NUM];/* contig. copy  */
};

struct iser_page_vec {
	u64 *pages;
	int length;
	int offset;
	int data_size;
};

struct iser_global {
	struct mutex      device_list_mutex;/*                   */
	struct list_head  device_list;	     /* all iSER devices */
	struct mutex      connlist_mutex;
	struct list_head  connlist;		/* all iSER IB connections */

	struct kmem_cache *desc_cache;
};

extern struct iser_global ig;
extern int iser_debug_level;

/* allocate connection resources needed for rdma functionality */
int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);

int iser_send_control(struct iscsi_conn *conn,
		      struct iscsi_cmd_task *ctask);

int iser_send_command(struct iscsi_conn *conn,
		      struct iscsi_cmd_task *ctask);

int iser_send_data_out(struct iscsi_conn *conn,
		       struct iscsi_cmd_task *ctask,
		       struct iscsi_data *hdr);

void iscsi_iser_recv(struct iscsi_conn *conn,
		     struct iscsi_hdr       *hdr,
		     char                   *rx_data,
		     int                    rx_data_len);

int  iser_conn_init(struct iser_conn **ib_conn);

void iser_conn_get(struct iser_conn *ib_conn);

void iser_conn_put(struct iser_conn *ib_conn);

void iser_conn_terminate(struct iser_conn *ib_conn);

void iser_rcv_completion(struct iser_desc *desc,
			 unsigned long    dto_xfer_len);

void iser_snd_completion(struct iser_desc *desc);

void iser_ctask_rdma_init(struct iscsi_iser_cmd_task *ctask);

void iser_ctask_rdma_finalize(struct iscsi_iser_cmd_task *ctask);

void iser_dto_buffs_release(struct iser_dto *dto);

int  iser_regd_buff_release(struct iser_regd_buf *regd_buf);

void iser_reg_single(struct iser_device      *device,
		     struct iser_regd_buf    *regd_buf,
		     enum dma_data_direction direction);

void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *ctask,
				     enum iser_data_dir         cmd_dir);

int  iser_reg_rdma_mem(struct iscsi_iser_cmd_task *ctask,
		       enum   iser_data_dir        cmd_dir);

int  iser_connect(struct iser_conn   *ib_conn,
		  struct sockaddr_in *src_addr,
		  struct sockaddr_in *dst_addr,
		  int                non_blocking);

int  iser_reg_page_vec(struct iser_conn     *ib_conn,
		       struct iser_page_vec *page_vec,
		       struct iser_mem_reg  *mem_reg);

void iser_unreg_mem(struct iser_mem_reg *mem_reg);

int  iser_post_recv(struct iser_desc *rx_desc);
int  iser_post_send(struct iser_desc *tx_desc);

int iser_conn_state_comp(struct iser_conn *ib_conn,
			 enum iser_ib_conn_state comp);

int iser_dma_map_task_data(struct iscsi_iser_cmd_task *iser_ctask,
			    struct iser_data_buf       *data,
			    enum   iser_data_dir       iser_dir,
			    enum   dma_data_direction  dma_dir);

void iser_dma_unmap_task_data(struct iscsi_iser_cmd_task *iser_ctask);
#endif
Commit	Line	Data
49cd5382 OG	1	/*
	2	* iSER transport for the Open iSCSI Initiator & iSER transport internals
	3	*
	4	* Copyright (C) 2004 Dmitry Yusupov
	5	* Copyright (C) 2004 Alex Aizman
	6	* Copyright (C) 2005 Mike Christie
	7	* based on code maintained by open-iscsi@googlegroups.com
	8	*
	9	* Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
	10	* Copyright (c) 2005, 2006 Cisco Systems. All rights reserved.
	11	*
	12	* This software is available to you under a choice of one of two
	13	* licenses. You may choose to be licensed under the terms of the GNU
	14	* General Public License (GPL) Version 2, available from the file
	15	* COPYING in the main directory of this source tree, or the
	16	* OpenIB.org BSD license below:
	17	*
	18	* Redistribution and use in source and binary forms, with or
	19	* without modification, are permitted provided that the following
	20	* conditions are met:
	21	*
	22	* - Redistributions of source code must retain the above
	23	* copyright notice, this list of conditions and the following
	24	* disclaimer.
	25	*
	26	* - Redistributions in binary form must reproduce the above
	27	* copyright notice, this list of conditions and the following
	28	* disclaimer in the documentation and/or other materials
	29	* provided with the distribution.
	30	*
	31	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	32	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	33	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
	34	* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
	35	* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	36	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	37	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
	38	* SOFTWARE.
	39	*
	40	* $Id: iscsi_iser.h 7051 2006-05-10 12:29:11Z ogerlitz $
	41	*/
	42	#ifndef __ISCSI_ISER_H__
	43	#define __ISCSI_ISER_H__
	44
	45	#include <linux/types.h>
	46	#include <linux/net.h>
	47	#include <scsi/libiscsi.h>
	48	#include <scsi/scsi_transport_iscsi.h>
	49
	50	#include <linux/wait.h>
	51	#include <linux/sched.h>
	52	#include <linux/list.h>
	53	#include <linux/slab.h>
	54	#include <linux/dma-mapping.h>
	55	#include <linux/mutex.h>
	56	#include <linux/mempool.h>
	57	#include <linux/uio.h>
	58
	59	#include <linux/socket.h>
	60	#include <linux/in.h>
	61	#include <linux/in6.h>
	62
	63	#include <rdma/ib_verbs.h>
	64	#include <rdma/ib_fmr_pool.h>
65	#include <rdma/rdma_cm.h>
66
67	#define DRV_NAME "iser"
68	#define PFX DRV_NAME ": "
69	#define DRV_VER "0.1"
70	#define DRV_DATE "May 7th, 2006"
71
72	#define iser_dbg(fmt, arg...) \
6f735e36 ED	73	do { \
	74	if (iser_debug_level > 1) \
	75	printk(KERN_DEBUG PFX "%s:" fmt,\
	76	__func__ , ## arg); \
	77	} while (0)
	78
	79	#define iser_warn(fmt, arg...) \
49cd5382 OG	80	do { \
	81	if (iser_debug_level > 0) \
	82	printk(KERN_DEBUG PFX "%s:" fmt,\
	83	__func__ , ## arg); \
	84	} while (0)
	85
	86	#define iser_err(fmt, arg...) \
	87	do { \
	88	printk(KERN_ERR PFX "%s:" fmt, \
	89	__func__ , ## arg); \
	90	} while (0)
	91
8dfa0876 EZ	92	#define SHIFT_4K 12
	93	#define SIZE_4K (1UL << SHIFT_4K)
	94	#define MASK_4K (~(SIZE_4K-1))
	95
49cd5382	96	/* support upto 512KB in one RDMA */
8dfa0876	97	#define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K)
49cd5382	98	#define ISCSI_ISER_MAX_LUN 256
49cd5382 OG	99
	100	/* QP settings */
	101	/* Maximal bounds on received asynchronous PDUs */
	102	#define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
	103
	104	#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
	105	* SCSI_TMFUNC(2), LOGOUT(1) */
	106
1548271e	107	#define ISER_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX + \
49cd5382 OG	108	ISER_MAX_RX_MISC_PDUS + \
	109	ISER_MAX_TX_MISC_PDUS)
	110
	111	/* the max TX (send) WR supported by the iSER QP is defined by *
	112	* max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
	113	* to have at max for SCSI command. The tx posting & completion handling code *
	114	* supports -EAGAIN scheme where tx is suspended till the QP has room for more *
	115	* send WR. D=8 comes from 64K/8K */
	116
	117	#define ISER_INFLIGHT_DATAOUTS 8
	118
1548271e	119	#define ISER_QP_MAX_REQ_DTOS (ISCSI_DEF_XMIT_CMDS_MAX * \
49cd5382 OG	120	(1 + ISER_INFLIGHT_DATAOUTS) + \
	121	ISER_MAX_TX_MISC_PDUS + \
	122	ISER_MAX_RX_MISC_PDUS)
	123
	124	#define ISER_VER 0x10
	125	#define ISER_WSV 0x08
	126	#define ISER_RSV 0x04
	127
	128	struct iser_hdr {
	129	u8 flags;
	130	u8 rsvd[3];
	131	__be32 write_stag; /* write rkey */
	132	__be64 write_va;
	133	__be32 read_stag; /* read rkey */
	134	__be64 read_va;
	135	} __attribute__((packed));
	136
	137
	138	/* Length of an object name string */
	139	#define ISER_OBJECT_NAME_SIZE 64
	140
	141	enum iser_ib_conn_state {
	142	ISER_CONN_INIT, /* descriptor allocd, no conn */
	143	ISER_CONN_PENDING, /* in the process of being established */
	144	ISER_CONN_UP, /* up and running */
	145	ISER_CONN_TERMINATING, /* in the process of being terminated */
	146	ISER_CONN_DOWN, /* shut down */
	147	ISER_CONN_STATES_NUM
	148	};
	149
	150	enum iser_task_status {
	151	ISER_TASK_STATUS_INIT = 0,
	152	ISER_TASK_STATUS_STARTED,
	153	ISER_TASK_STATUS_COMPLETED
	154	};
	155
	156	enum iser_data_dir {
	157	ISER_DIR_IN = 0, /* to initiator */
	158	ISER_DIR_OUT, /* from initiator */
	159	ISER_DIRS_NUM
	160	};
	161
	162	struct iser_data_buf {
	163	void buf; / pointer to the sg list */
	164	unsigned int size; /* num entries of this sg */
	165	unsigned long data_len; /* total data len */
	166	unsigned int dma_nents; /* returned by dma_map_sg */
	167	char copy_buf; / allocated copy buf for SGs unaligned *
	168	* for rdma which are copied */
	169	struct scatterlist sg_single; /* SG-ified clone of a non SG SC or *
	170	* unaligned SG */
	171	};
	172
	173	/* fwd declarations */
	174	struct iser_device;
	175	struct iscsi_iser_conn;
	176	struct iscsi_iser_cmd_task;
	177
	178	struct iser_mem_reg {
	179	u32 lkey;
	180	u32 rkey;
	181	u64 va;
	182	u64 len;
	183	void *mem_h;
d8111028	184	int is_fmr;
49cd5382 OG	185	};
	186
	187	struct iser_regd_buf {
	188	struct iser_mem_reg reg; /* memory registration info */
	189	void *virt_addr;
	190	struct iser_device device; / device->device for dma_unmap */
5180311f	191	u64 dma_addr; /* if non zero, addr for dma_unmap */
49cd5382 OG	192	enum dma_data_direction direction; /* direction for dma_unmap */
	193	unsigned int data_size;
	194	atomic_t ref_count; /* refcount, freed when dec to 0 */
	195	};
	196
	197	#define MAX_REGD_BUF_VECTOR_LEN 2
	198
	199	struct iser_dto {
	200	struct iscsi_iser_cmd_task *ctask;
87e8df7a	201	struct iser_conn *ib_conn;
49cd5382 OG	202	int notify_enable;
	203
	204	/* vector of registered buffers */
	205	unsigned int regd_vector_len;
	206	struct iser_regd_buf *regd[MAX_REGD_BUF_VECTOR_LEN];
	207
	208	/* offset into the registered buffer may be specified */
	209	unsigned int offset[MAX_REGD_BUF_VECTOR_LEN];
	210
	211	/* a smaller size may be specified, if 0, then full size is used */
	212	unsigned int used_sz[MAX_REGD_BUF_VECTOR_LEN];
	213	};
	214
	215	enum iser_desc_type {
	216	ISCSI_RX,
	217	ISCSI_TX_CONTROL ,
	218	ISCSI_TX_SCSI_COMMAND,
	219	ISCSI_TX_DATAOUT
	220	};
	221
	222	struct iser_desc {
	223	struct iser_hdr iser_header;
	224	struct iscsi_hdr iscsi_header;
	225	struct iser_regd_buf hdr_regd_buf;
	226	void data; / used by RX & TX_CONTROL */
	227	struct iser_regd_buf data_regd_buf; /* used by RX & TX_CONTROL */
	228	enum iser_desc_type type;
	229	struct iser_dto dto;
	230	};
	231
	232	struct iser_device {
	233	struct ib_device *ib_device;
	234	struct ib_pd *pd;
	235	struct ib_cq *cq;
	236	struct ib_mr *mr;
	237	struct tasklet_struct cq_tasklet;
	238	struct list_head ig_list; /* entry in ig devices list */
	239	int refcount;
	240	};
	241
	242	struct iser_conn {
	243	struct iscsi_iser_conn iser_conn; / iser conn for upcalls */
	244	enum iser_ib_conn_state state; /* rdma connection state */
b40977d9	245	atomic_t refcount;
49cd5382 OG	246	spinlock_t lock; /* used for state changes */
	247	struct iser_device device; / device context */
	248	struct rdma_cm_id cma_id; / CMA ID */
	249	struct ib_qp qp; / QP */
	250	struct ib_fmr_pool fmr_pool; / pool of IB FMRs */
	251	int disc_evt_flag; /* disconn event delivered */
	252	wait_queue_head_t wait; /* waitq for conn/disconn */
	253	atomic_t post_recv_buf_count; /* posted rx count */
	254	atomic_t post_send_buf_count; /* posted tx count */
49cd5382 OG	255	char name[ISER_OBJECT_NAME_SIZE];
	256	struct iser_page_vec page_vec; / represents SG to fmr maps*
	257	* maps serialized as tx is*/
	258	struct list_head conn_list; /* entry in ig conn list */
	259	};
	260
	261	struct iscsi_iser_conn {
	262	struct iscsi_conn iscsi_conn;/ ptr to iscsi conn */
	263	struct iser_conn ib_conn; / iSER IB conn */
	264
	265	rwlock_t lock;
	266	};
	267
	268	struct iscsi_iser_cmd_task {
	269	struct iser_desc desc;
	270	struct iscsi_iser_conn *iser_conn;
49cd5382 OG	271	enum iser_task_status status;
	272	int command_sent; /* set if command sent */
	273	int dir[ISER_DIRS_NUM]; /* set if dir use*/
	274	struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
	275	struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/
	276	struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */
	277	};
	278
	279	struct iser_page_vec {
	280	u64 *pages;
	281	int length;
	282	int offset;
	283	int data_size;
	284	};
	285
	286	struct iser_global {
	287	struct mutex device_list_mutex;/* */
	288	struct list_head device_list; /* all iSER devices */
	289	struct mutex connlist_mutex;
	290	struct list_head connlist; /* all iSER IB connections */
	291
e54f8188	292	struct kmem_cache *desc_cache;
49cd5382 OG	293	};
	294
	295	extern struct iser_global ig;
	296	extern int iser_debug_level;
	297
	298	/* allocate connection resources needed for rdma functionality */
	299	int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);
	300
2747fdb2 MC	301	int iser_send_control(struct iscsi_conn *conn,
2747fdb2 MC	302	struct iscsi_cmd_task *ctask);
49cd5382	303
2747fdb2 MC	304	int iser_send_command(struct iscsi_conn *conn,
2747fdb2 MC	305	struct iscsi_cmd_task *ctask);
49cd5382	306
2747fdb2	307	int iser_send_data_out(struct iscsi_conn *conn,
49cd5382	308	struct iscsi_cmd_task *ctask,
2747fdb2	309	struct iscsi_data *hdr);
49cd5382 OG	310
	311	void iscsi_iser_recv(struct iscsi_conn *conn,
	312	struct iscsi_hdr *hdr,
	313	char *rx_data,
	314	int rx_data_len);
	315
	316	int iser_conn_init(struct iser_conn **ib_conn);
	317
b40977d9 MC	318	void iser_conn_get(struct iser_conn *ib_conn);
	319
	320	void iser_conn_put(struct iser_conn *ib_conn);
	321
49cd5382 OG	322	void iser_conn_terminate(struct iser_conn *ib_conn);
49cd5382 OG	323
49cd5382 OG	324	void iser_rcv_completion(struct iser_desc *desc,
	325	unsigned long dto_xfer_len);
	326
	327	void iser_snd_completion(struct iser_desc *desc);
	328
2747fdb2	329	void iser_ctask_rdma_init(struct iscsi_iser_cmd_task *ctask);
49cd5382 OG	330
	331	void iser_ctask_rdma_finalize(struct iscsi_iser_cmd_task *ctask);
	332
	333	void iser_dto_buffs_release(struct iser_dto *dto);
	334
	335	int iser_regd_buff_release(struct iser_regd_buf *regd_buf);
	336
	337	void iser_reg_single(struct iser_device *device,
	338	struct iser_regd_buf *regd_buf,
	339	enum dma_data_direction direction);
	340
49cd5382 OG	341	void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *ctask,
	342	enum iser_data_dir cmd_dir);
	343
	344	int iser_reg_rdma_mem(struct iscsi_iser_cmd_task *ctask,
	345	enum iser_data_dir cmd_dir);
	346
	347	int iser_connect(struct iser_conn *ib_conn,
	348	struct sockaddr_in *src_addr,
	349	struct sockaddr_in *dst_addr,
	350	int non_blocking);
	351
	352	int iser_reg_page_vec(struct iser_conn *ib_conn,
	353	struct iser_page_vec *page_vec,
	354	struct iser_mem_reg *mem_reg);
	355
	356	void iser_unreg_mem(struct iser_mem_reg *mem_reg);
	357
	358	int iser_post_recv(struct iser_desc *rx_desc);
	359	int iser_post_send(struct iser_desc *tx_desc);
	360
	361	int iser_conn_state_comp(struct iser_conn *ib_conn,
	362	enum iser_ib_conn_state comp);
74a20780 EZ	363
	364	int iser_dma_map_task_data(struct iscsi_iser_cmd_task *iser_ctask,
	365	struct iser_data_buf *data,
	366	enum iser_data_dir iser_dir,
	367	enum dma_data_direction dma_dir);
	368
	369	void iser_dma_unmap_task_data(struct iscsi_iser_cmd_task *iser_ctask);
49cd5382	370	#endif