/*
   * SCSI target kernel/user interface
   *
   * Copyright (C) 2005 FUJITA Tomonori <tomof@acm.org>
   * Copyright (C) 2005 Mike Christie <michaelc@cs.wisc.edu>
   *
   * 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.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
   * 02110-1301 USA
   */
  #ifndef __SCSI_TARGET_IF_H
  #define __SCSI_TARGET_IF_H
  
  /* user -> kernel */

  #define	TGT_UEVENT_CMD_RSP		0x0001
  #define	TGT_UEVENT_IT_NEXUS_RSP		0x0002
  #define	TGT_UEVENT_TSK_MGMT_RSP		0x0003

  
  /* kernel -> user */

  #define	TGT_KEVENT_CMD_REQ		0x1001
  #define	TGT_KEVENT_CMD_DONE		0x1002
  #define	TGT_KEVENT_IT_NEXUS_REQ		0x1003
  #define	TGT_KEVENT_TSK_MGMT_REQ		0x1004

  
  struct tgt_event_hdr {
  	uint16_t version;
  	uint16_t status;
  	uint16_t type;
  	uint16_t len;
  } __attribute__ ((aligned (sizeof(uint64_t))));
  
  struct tgt_event {
  	struct tgt_event_hdr hdr;
  
  	union {
  		/* user-> kernel */
  		struct {
  			int host_no;

  			int result;

  			aligned_u64 itn_id;

  			aligned_u64 tag;

  			aligned_u64 uaddr;

  			aligned_u64 sense_uaddr;
  			uint32_t len;
  			uint32_t sense_len;

  			uint8_t rw;

  		} cmd_rsp;
  		struct {
  			int host_no;

  			int result;

  			aligned_u64 itn_id;
  			aligned_u64 mid;

  		} tsk_mgmt_rsp;

  		struct {
  			__s32 host_no;
  			__s32 result;
  			aligned_u64 itn_id;
  			__u32 function;
  		} it_nexus_rsp;

  
  		/* kernel -> user */
  		struct {
  			int host_no;
  			uint32_t data_len;

  			aligned_u64 itn_id;

  			uint8_t scb[16];
  			uint8_t lun[8];
  			int attribute;
  			aligned_u64 tag;
  		} cmd_req;
  		struct {
  			int host_no;

  			int result;

  			aligned_u64 itn_id;
  			aligned_u64 tag;

  		} cmd_done;
  		struct {
  			int host_no;
  			int function;

  			aligned_u64 itn_id;

  			aligned_u64 tag;
  			uint8_t lun[8];
  			aligned_u64 mid;
  		} tsk_mgmt_req;

  		struct {
  			__s32 host_no;
  			__u32 function;
  			aligned_u64 itn_id;
  			__u32 max_cmds;
  			__u8 initiator_id[16];
  		} it_nexus_req;

  	} p;
  } __attribute__ ((aligned (sizeof(uint64_t))));
  
  #define TGT_RING_SIZE (1UL << 16)

  
  #endif