/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _ISER_XFER_H
#define _ISER_XFER_H

#ifdef  __cplusplus
extern "C" {
#endif

#include <sys/types.h>
#include <sys/ib/ibtl/ibti.h>
#include <sys/ib/ibtl/ibtl_types.h>
#include <sys/iscsi_protocol.h>

/*
 * iser_xfer.h
 *      Definitions and functions related to data transfer across the RC channel
 * This includes the posting of the Hello Message, the HelloReply Message, the
 * RC Send Message for the iSCSI Control PDU.
 */

/*
 * iser_private_data_s contains parameters relating to the iSER connection and
 * IB options support status. This data conforms to the 'iSER CM REQ Message
 * Private Data Format' from the Annex A12 - Support for iSCSI Extensions for
 * RDMA.
 */
#pragma pack(1)
typedef struct iser_private_data_s {
        uint8_t         ip_pvt[IBT_IP_HDR_PRIV_DATA_SZ];
#if defined(_BIT_FIELDS_LTOH)
        uint32_t        rsvd1   :30,
                        sie     :1,
                        zbvae   :1;
#elif defined(_BIT_FIELDS_HTOL)
        uint32_t        zbvae   :1,
                        sie     :1,
                        rsvd1   :30;
#else
#error  One of _BIT_FIELDS_LTOH or _BIT_FIELDS_HTOL must be defined
#endif /* _BIT_FIELDS_LTOH */
        uint8_t         rsvd2[52];
} iser_private_data_t;

/* iSER Message Opcodes */
#define ISER_OPCODE_CTRL_TYPE_PDU       1
#define ISER_OPCODE_HELLO_MSG           2
#define ISER_OPCODE_HELLOREPLY_MSG      3

/*
 * When ZBVA is not supported, both the initiator and the target shall use the
 * expanded iSER header as defined in the IB Spec Table 540 for iSCSI control-
 * type PDUs in the connection
 */
typedef struct iser_ctrl_hdr_s {
#if defined(_BIT_FIELDS_LTOH)
        uint8_t         rsvd1:    2,
                        rsv_flag: 1, /* RStag valid bit */
                        wsv_flag: 1, /* WStag valid bit */
                        opcode:   4; /* iSER opcode */
        uint8_t         rsvd[3];
#elif defined(_BIT_FIELDS_HTOL)
        uint8_t         opcode:   4,
                        wsv_flag: 1,
                        rsv_flag: 1,
                        rsvd1:    2;
        uint8_t         rsvd[3];
#else
#error  One of _BIT_FIELDS_LTOH or _BIT_FIELDS_HTOL must be defined
#endif /* _BIT_FIELDS_LTOH */
        uint32_t        wstag;          /* IB R-key for SCSI Write */
        uint64_t        wva;            /* IB VA for SCSI Write */
        uint32_t        rstag;          /* IB R-key for SCSI Read */
        uint64_t        rva;            /* IB VA for SCSI Read */
} iser_ctrl_hdr_t;

/* iSER Header Format for the iSER Hello Message */
typedef struct iser_hello_hdr_s {
#if defined(_BIT_FIELDS_LTOH)
        uint8_t         rsvd1   : 4,
                        opcode  : 4;
        uint8_t         minver  : 4,
                        maxver  : 4;
#elif defined(_BIT_FIELDS_HTOL)
        uint8_t         opcode  : 4,
                        rsvd1   : 4;
        uint8_t         maxver  : 4,
                        minver  : 4;
#else
#error  One of _BIT_FIELDS_LTOH or _BIT_FIELDS_HTOL must be defined
#endif /* _BIT_FIELDS_LTOH */
        uint16_t        iser_ird;
        uint32_t        rsvd2[2];
} iser_hello_hdr_t;

/* iSER Header Format for the iSER HelloReply Message */
typedef struct iser_helloreply_hdr_s {
#if defined(_BIT_FIELDS_LTOH)
        uint8_t         flag    : 1,
                        rsvd1   : 3,
                        opcode  : 4;
        uint8_t         curver  : 4,
                        maxver  : 4;
#elif defined(_BIT_FIELDS_HTOL)
        uint8_t         opcode  : 4,
                        rsvd1   : 3,
                        flag    : 1;
        uint8_t         maxver  : 4,
                        curver  : 4;
#else
#error  One of _BIT_FIELDS_LTOH or _BIT_FIELDS_HTOL must be defined
#endif /* _BIT_FIELDS_LTOH */
        uint16_t        iser_ord;
        uint32_t        rsvd2[2];
} iser_helloreply_hdr_t;
#pragma pack()

struct iser_state_s;

int iser_xfer_hello_msg(iser_chan_t *chan);

int iser_xfer_helloreply_msg(iser_chan_t *chan);

int iser_xfer_ctrlpdu(iser_chan_t *chan, idm_pdu_t *pdu);

int iser_xfer_buf_to_ini(idm_task_t *idt, idm_buf_t *buf);

int iser_xfer_buf_from_ini(idm_task_t *idt, idm_buf_t *buf);

#ifdef  __cplusplus
}
#endif

#endif /* _ISER_XFER_H */