[net-next-2.6.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.
 */
#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 ISER_DEF_CMD_PER_LUN		128

/* 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)

#define ISER_MIN_POSTED_RX		(ISCSI_DEF_XMIT_CMDS_MAX >> 2)

/* 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));

/* Constant PDU lengths calculations */
#define ISER_HEADERS_LEN  (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))

#define ISER_RECV_DATA_SEG_LEN	128
#define ISER_RX_PAYLOAD_SIZE	(ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
#define ISER_RX_LOGIN_SIZE	(ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)

/* 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_task;
struct iscsi_endpoint;

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_task *task;
	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_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;
};

#define ISER_RX_PAD_SIZE	(256 - (ISER_RX_PAYLOAD_SIZE + \
					sizeof(u64) + sizeof(struct ib_sge)))
struct iser_rx_desc {
	struct iser_hdr              iser_header;
	struct iscsi_hdr             iscsi_header;
	char		             data[ISER_RECV_DATA_SEG_LEN];
	u64		             dma_addr;
	struct ib_sge		     rx_sg;
	char		             pad[ISER_RX_PAD_SIZE];
} __attribute__((packed));

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  */
	struct iscsi_endpoint	     *ep;
	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 */

	char  			     *login_buf;
	u64 			     login_dma;
	unsigned int 		     rx_desc_head;
	struct iser_rx_desc	     *rx_descs;
	struct ib_recv_wr	     rx_wr[ISER_MIN_POSTED_RX];
};

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

struct iscsi_iser_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_task *task);

int iser_send_command(struct iscsi_conn *conn,
		      struct iscsi_task *task);

int iser_send_data_out(struct iscsi_conn *conn,
		       struct iscsi_task *task,
		       struct iscsi_data *hdr);

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

void 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_rx_desc *desc,
			 unsigned long    dto_xfer_len,
			struct iser_conn *ib_conn);

void iser_snd_completion(struct iser_desc *desc);

void iser_task_rdma_init(struct iscsi_iser_task *task);

void iser_task_rdma_finalize(struct iscsi_iser_task *task);

void iser_dto_buffs_release(struct iser_dto *dto);

int  iser_regd_buff_release(struct iser_regd_buf *regd_buf);

void iser_free_rx_descriptors(struct iser_conn *ib_conn);

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_task *task,
				     enum iser_data_dir         cmd_dir);

int  iser_reg_rdma_mem(struct iscsi_iser_task *task,
		       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_recvl(struct iser_conn *ib_conn);
int  iser_post_recvm(struct iser_conn *ib_conn, int count);
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_task *iser_task,
			    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_task *iser_task);
#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.
49cd5382 OG	39	*/
	40	#ifndef __ISCSI_ISER_H__
	41	#define __ISCSI_ISER_H__
	42
	43	#include <linux/types.h>
	44	#include <linux/net.h>
	45	#include <scsi/libiscsi.h>
	46	#include <scsi/scsi_transport_iscsi.h>
	47
	48	#include <linux/wait.h>
	49	#include <linux/sched.h>
	50	#include <linux/list.h>
	51	#include <linux/slab.h>
	52	#include <linux/dma-mapping.h>
	53	#include <linux/mutex.h>
	54	#include <linux/mempool.h>
	55	#include <linux/uio.h>
	56
	57	#include <linux/socket.h>
	58	#include <linux/in.h>
	59	#include <linux/in6.h>
	60
	61	#include <rdma/ib_verbs.h>
	62	#include <rdma/ib_fmr_pool.h>
	63	#include <rdma/rdma_cm.h>
	64
	65	#define DRV_NAME "iser"
	66	#define PFX DRV_NAME ": "
	67	#define DRV_VER "0.1"
	68	#define DRV_DATE "May 7th, 2006"
	69
	70	#define iser_dbg(fmt, arg...) \
6f735e36 ED	71	do { \
	72	if (iser_debug_level > 1) \
	73	printk(KERN_DEBUG PFX "%s:" fmt,\
	74	__func__ , ## arg); \
	75	} while (0)
	76
	77	#define iser_warn(fmt, arg...) \
49cd5382 OG	78	do { \
	79	if (iser_debug_level > 0) \
	80	printk(KERN_DEBUG PFX "%s:" fmt,\
	81	__func__ , ## arg); \
	82	} while (0)
	83
	84	#define iser_err(fmt, arg...) \
	85	do { \
	86	printk(KERN_ERR PFX "%s:" fmt, \
	87	__func__ , ## arg); \
	88	} while (0)
	89
8dfa0876 EZ	90	#define SHIFT_4K 12
	91	#define SIZE_4K (1UL << SHIFT_4K)
	92	#define MASK_4K (~(SIZE_4K-1))
	93
49cd5382	94	/* support upto 512KB in one RDMA */
8dfa0876	95	#define ISCSI_ISER_SG_TABLESIZE (0x80000 >> SHIFT_4K)
e28f3d5b	96	#define ISER_DEF_CMD_PER_LUN 128
49cd5382 OG	97
	98	/* QP settings */
	99	/* Maximal bounds on received asynchronous PDUs */
	100	#define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
	101
	102	#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
	103	* SCSI_TMFUNC(2), LOGOUT(1) */
	104
bcc60c38 OG	105	#define ISER_QP_MAX_RECV_DTOS (ISCSI_DEF_XMIT_CMDS_MAX)
	106
	107	#define ISER_MIN_POSTED_RX (ISCSI_DEF_XMIT_CMDS_MAX >> 2)
49cd5382 OG	108
	109	/* the max TX (send) WR supported by the iSER QP is defined by *
	110	* max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
	111	* to have at max for SCSI command. The tx posting & completion handling code *
	112	* supports -EAGAIN scheme where tx is suspended till the QP has room for more *
	113	* send WR. D=8 comes from 64K/8K */
	114
	115	#define ISER_INFLIGHT_DATAOUTS 8
	116
1548271e	117	#define ISER_QP_MAX_REQ_DTOS (ISCSI_DEF_XMIT_CMDS_MAX * \
49cd5382 OG	118	(1 + ISER_INFLIGHT_DATAOUTS) + \
	119	ISER_MAX_TX_MISC_PDUS + \
	120	ISER_MAX_RX_MISC_PDUS)
	121
	122	#define ISER_VER 0x10
	123	#define ISER_WSV 0x08
	124	#define ISER_RSV 0x04
	125
	126	struct iser_hdr {
	127	u8 flags;
	128	u8 rsvd[3];
	129	__be32 write_stag; /* write rkey */
	130	__be64 write_va;
	131	__be32 read_stag; /* read rkey */
	132	__be64 read_va;
	133	} __attribute__((packed));
	134
bcc60c38 OG	135	/* Constant PDU lengths calculations */
	136	#define ISER_HEADERS_LEN (sizeof(struct iser_hdr) + sizeof(struct iscsi_hdr))
	137
	138	#define ISER_RECV_DATA_SEG_LEN 128
	139	#define ISER_RX_PAYLOAD_SIZE (ISER_HEADERS_LEN + ISER_RECV_DATA_SEG_LEN)
	140	#define ISER_RX_LOGIN_SIZE (ISER_HEADERS_LEN + ISCSI_DEF_MAX_RECV_SEG_LEN)
49cd5382 OG	141
	142	/* Length of an object name string */
	143	#define ISER_OBJECT_NAME_SIZE 64
	144
	145	enum iser_ib_conn_state {
	146	ISER_CONN_INIT, /* descriptor allocd, no conn */
	147	ISER_CONN_PENDING, /* in the process of being established */
	148	ISER_CONN_UP, /* up and running */
	149	ISER_CONN_TERMINATING, /* in the process of being terminated */
	150	ISER_CONN_DOWN, /* shut down */
	151	ISER_CONN_STATES_NUM
	152	};
	153
	154	enum iser_task_status {
	155	ISER_TASK_STATUS_INIT = 0,
	156	ISER_TASK_STATUS_STARTED,
	157	ISER_TASK_STATUS_COMPLETED
	158	};
	159
	160	enum iser_data_dir {
	161	ISER_DIR_IN = 0, /* to initiator */
	162	ISER_DIR_OUT, /* from initiator */
	163	ISER_DIRS_NUM
	164	};
	165
	166	struct iser_data_buf {
	167	void buf; / pointer to the sg list */
	168	unsigned int size; /* num entries of this sg */
	169	unsigned long data_len; /* total data len */
	170	unsigned int dma_nents; /* returned by dma_map_sg */
	171	char copy_buf; / allocated copy buf for SGs unaligned *
	172	* for rdma which are copied */
	173	struct scatterlist sg_single; /* SG-ified clone of a non SG SC or *
	174	* unaligned SG */
	175	};
	176
	177	/* fwd declarations */
	178	struct iser_device;
	179	struct iscsi_iser_conn;
2261ec3d	180	struct iscsi_iser_task;
412eeafa	181	struct iscsi_endpoint;
49cd5382 OG	182
	183	struct iser_mem_reg {
	184	u32 lkey;
	185	u32 rkey;
	186	u64 va;
	187	u64 len;
	188	void *mem_h;
d8111028	189	int is_fmr;
49cd5382 OG	190	};
	191
	192	struct iser_regd_buf {
	193	struct iser_mem_reg reg; /* memory registration info */
	194	void *virt_addr;
	195	struct iser_device device; / device->device for dma_unmap */
5180311f	196	u64 dma_addr; /* if non zero, addr for dma_unmap */
49cd5382 OG	197	enum dma_data_direction direction; /* direction for dma_unmap */
	198	unsigned int data_size;
	199	atomic_t ref_count; /* refcount, freed when dec to 0 */
	200	};
	201
	202	#define MAX_REGD_BUF_VECTOR_LEN 2
	203
	204	struct iser_dto {
2261ec3d	205	struct iscsi_iser_task *task;
87e8df7a	206	struct iser_conn *ib_conn;
49cd5382 OG	207	int notify_enable;
	208
	209	/* vector of registered buffers */
	210	unsigned int regd_vector_len;
	211	struct iser_regd_buf *regd[MAX_REGD_BUF_VECTOR_LEN];
	212
	213	/* offset into the registered buffer may be specified */
	214	unsigned int offset[MAX_REGD_BUF_VECTOR_LEN];
	215
	216	/* a smaller size may be specified, if 0, then full size is used */
	217	unsigned int used_sz[MAX_REGD_BUF_VECTOR_LEN];
	218	};
	219
	220	enum iser_desc_type {
49cd5382 OG	221	ISCSI_TX_CONTROL ,
	222	ISCSI_TX_SCSI_COMMAND,
	223	ISCSI_TX_DATAOUT
	224	};
	225
	226	struct iser_desc {
	227	struct iser_hdr iser_header;
	228	struct iscsi_hdr iscsi_header;
	229	struct iser_regd_buf hdr_regd_buf;
	230	void data; / used by RX & TX_CONTROL */
	231	struct iser_regd_buf data_regd_buf; /* used by RX & TX_CONTROL */
	232	enum iser_desc_type type;
	233	struct iser_dto dto;
	234	};
	235
bcc60c38 OG	236	#define ISER_RX_PAD_SIZE (256 - (ISER_RX_PAYLOAD_SIZE + \
	237	sizeof(u64) + sizeof(struct ib_sge)))
	238	struct iser_rx_desc {
	239	struct iser_hdr iser_header;
	240	struct iscsi_hdr iscsi_header;
	241	char data[ISER_RECV_DATA_SEG_LEN];
	242	u64 dma_addr;
	243	struct ib_sge rx_sg;
	244	char pad[ISER_RX_PAD_SIZE];
	245	} __attribute__((packed));
	246
49cd5382 OG	247	struct iser_device {
	248	struct ib_device *ib_device;
	249	struct ib_pd *pd;
	250	struct ib_cq *cq;
	251	struct ib_mr *mr;
	252	struct tasklet_struct cq_tasklet;
	253	struct list_head ig_list; /* entry in ig devices list */
	254	int refcount;
	255	};
	256
	257	struct iser_conn {
	258	struct iscsi_iser_conn iser_conn; / iser conn for upcalls */
412eeafa	259	struct iscsi_endpoint *ep;
49cd5382	260	enum iser_ib_conn_state state; /* rdma connection state */
b40977d9	261	atomic_t refcount;
49cd5382 OG	262	spinlock_t lock; /* used for state changes */
	263	struct iser_device device; / device context */
	264	struct rdma_cm_id cma_id; / CMA ID */
	265	struct ib_qp qp; / QP */
	266	struct ib_fmr_pool fmr_pool; / pool of IB FMRs */
	267	int disc_evt_flag; /* disconn event delivered */
	268	wait_queue_head_t wait; /* waitq for conn/disconn */
	269	atomic_t post_recv_buf_count; /* posted rx count */
	270	atomic_t post_send_buf_count; /* posted tx count */
49cd5382 OG	271	char name[ISER_OBJECT_NAME_SIZE];
	272	struct iser_page_vec page_vec; / represents SG to fmr maps*
	273	* maps serialized as tx is*/
	274	struct list_head conn_list; /* entry in ig conn list */
bcc60c38 OG	275
	276	char *login_buf;
	277	u64 login_dma;
	278	unsigned int rx_desc_head;
	279	struct iser_rx_desc *rx_descs;
	280	struct ib_recv_wr rx_wr[ISER_MIN_POSTED_RX];
49cd5382 OG	281	};
	282
	283	struct iscsi_iser_conn {
	284	struct iscsi_conn iscsi_conn;/ ptr to iscsi conn */
	285	struct iser_conn ib_conn; / iSER IB conn */
49cd5382 OG	286	};
49cd5382 OG	287
2261ec3d	288	struct iscsi_iser_task {
49cd5382 OG	289	struct iser_desc desc;
49cd5382 OG	290	struct iscsi_iser_conn *iser_conn;
49cd5382 OG	291	enum iser_task_status status;
	292	int command_sent; /* set if command sent */
	293	int dir[ISER_DIRS_NUM]; /* set if dir use*/
	294	struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
	295	struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/
	296	struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */
	297	};
	298
	299	struct iser_page_vec {
	300	u64 *pages;
	301	int length;
	302	int offset;
	303	int data_size;
	304	};
	305
	306	struct iser_global {
	307	struct mutex device_list_mutex;/* */
	308	struct list_head device_list; /* all iSER devices */
	309	struct mutex connlist_mutex;
	310	struct list_head connlist; /* all iSER IB connections */
	311
e54f8188	312	struct kmem_cache *desc_cache;
49cd5382 OG	313	};
	314
	315	extern struct iser_global ig;
	316	extern int iser_debug_level;
	317
	318	/* allocate connection resources needed for rdma functionality */
	319	int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);
	320
2747fdb2	321	int iser_send_control(struct iscsi_conn *conn,
2261ec3d	322	struct iscsi_task *task);
49cd5382	323
2747fdb2	324	int iser_send_command(struct iscsi_conn *conn,
2261ec3d	325	struct iscsi_task *task);
49cd5382	326
2747fdb2	327	int iser_send_data_out(struct iscsi_conn *conn,
2261ec3d	328	struct iscsi_task *task,
2747fdb2	329	struct iscsi_data *hdr);
49cd5382 OG	330
	331	void iscsi_iser_recv(struct iscsi_conn *conn,
	332	struct iscsi_hdr *hdr,
	333	char *rx_data,
	334	int rx_data_len);
	335
412eeafa	336	void iser_conn_init(struct iser_conn *ib_conn);
49cd5382	337
b40977d9 MC	338	void iser_conn_get(struct iser_conn *ib_conn);
	339
	340	void iser_conn_put(struct iser_conn *ib_conn);
49cd5382 OG	341
	342	void iser_conn_terminate(struct iser_conn *ib_conn);
	343
bcc60c38 OG	344	void iser_rcv_completion(struct iser_rx_desc *desc,
	345	unsigned long dto_xfer_len,
	346	struct iser_conn *ib_conn);
49cd5382 OG	347
	348	void iser_snd_completion(struct iser_desc *desc);
	349
2261ec3d	350	void iser_task_rdma_init(struct iscsi_iser_task *task);
49cd5382	351
2261ec3d	352	void iser_task_rdma_finalize(struct iscsi_iser_task *task);
49cd5382 OG	353
	354	void iser_dto_buffs_release(struct iser_dto *dto);
	355
	356	int iser_regd_buff_release(struct iser_regd_buf *regd_buf);
	357
bcc60c38 OG	358	void iser_free_rx_descriptors(struct iser_conn *ib_conn);
bcc60c38 OG	359
49cd5382 OG	360	void iser_reg_single(struct iser_device *device,
	361	struct iser_regd_buf *regd_buf,
	362	enum dma_data_direction direction);
	363
2261ec3d	364	void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_task *task,
49cd5382 OG	365	enum iser_data_dir cmd_dir);
49cd5382 OG	366
2261ec3d	367	int iser_reg_rdma_mem(struct iscsi_iser_task *task,
49cd5382 OG	368	enum iser_data_dir cmd_dir);
	369
	370	int iser_connect(struct iser_conn *ib_conn,
	371	struct sockaddr_in *src_addr,
	372	struct sockaddr_in *dst_addr,
	373	int non_blocking);
	374
	375	int iser_reg_page_vec(struct iser_conn *ib_conn,
	376	struct iser_page_vec *page_vec,
	377	struct iser_mem_reg *mem_reg);
	378
	379	void iser_unreg_mem(struct iser_mem_reg *mem_reg);
	380
bcc60c38 OG	381	int iser_post_recvl(struct iser_conn *ib_conn);
bcc60c38 OG	382	int iser_post_recvm(struct iser_conn *ib_conn, int count);
49cd5382 OG	383	int iser_post_send(struct iser_desc *tx_desc);
	384
	385	int iser_conn_state_comp(struct iser_conn *ib_conn,
	386	enum iser_ib_conn_state comp);
74a20780	387
2261ec3d	388	int iser_dma_map_task_data(struct iscsi_iser_task *iser_task,
74a20780 EZ	389	struct iser_data_buf *data,
	390	enum iser_data_dir iser_dir,
	391	enum dma_data_direction dma_dir);
	392
2261ec3d	393	void iser_dma_unmap_task_data(struct iscsi_iser_task *iser_task);
49cd5382	394	#endif