iscsi_cmd.h revision 36c5fee33fa8b822175d410202aebcf592c8d342
/*
* 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 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef _TARGET_CMD_H
#define _TARGET_CMD_H
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* Block comment which describes the contents of this file.
*/
#ifdef __cplusplus
extern "C" {
#endif
#include <sys/types.h>
#include <sys/avl.h>
#include <aio.h>
#include "local_types.h"
#include "t10.h"
#define CMD_MAXOUTSTANDING 64
typedef enum {
FindTTT,
FindITT
} find_type_t;
typedef enum {
CmdAlloc,
CmdCanceled,
CmdFree
} cmd_state_t;
typedef struct iscsi_delayed {
struct iscsi_delayed *id_prev,
*id_next;
t10_cmd_t *id_t10_cmd;
size_t id_offset;
} iscsi_delayed_t;
typedef struct iscsi_cmd {
struct iscsi_cmd *c_next;
struct iscsi_cmd *c_prev;
/*
* Always kept in network byte order since we only
* store this field
*/
uint32_t c_itt;
uint32_t c_opcode;
uint32_t c_ttt;
uint32_t c_cmdsn;
uint32_t c_datasn;
uint32_t c_statsn;
Boolean_t c_writeop;
uint32_t c_lun;
/*
* Default storage for SCB which is the most common size to day.
*/
uint8_t c_scb_default[16];
/*
* If the CDB is larger than 16 bytes an Alternate Header Segment
* is used and memory allocated which is pointed to by the following
*/
uint8_t *c_scb_extended;
/*
* Points at the appropriate memory area for the SCB
*/
uint8_t *c_scb;
uint32_t c_scb_len;
cmd_state_t c_state;
uint32_t c_status;
/*
* When ImmediateData==Yes it'll be read in to a buffer
* allocated by the connection. This will be free'd when the
* callback is done which means the SAM-3 layer is finished with
* the data.
*/
char *c_data;
size_t c_data_len;
off_t c_offset_out;
/*
* Arrange for the PDUs to always be sent in order. If DataPDUInOrder
* is True this is a *must* according to the specification. There's
* also a need that the final flag bit not be sent unless all other
* packets have been, regardless of order. Without keeping a complicated
* bitmap of which packets have been sent for this second case we
* just order things always.
*/
off_t c_offset_in;
iscsi_delayed_t *c_t10_delayed;
Boolean_t c_data_alloc;
void (*c_dataout_cb)(t10_cmd_t *cmd, char *data,
size_t *xfer);
/*
* Used to hold the interface pointer when we've got an R2T
* for this command. This is needed because memory is allocated
* normally by the emulation layer and we can copy directly to that
* instead of allocating our own buffer.
*/
t10_cmd_t *c_t10_cmd;
/*
* Used by the session layer to send packets out the same
* connection.
*/
struct iscsi_conn *c_allegiance;
hrtime_t c_t_start,
c_t_completion;
} iscsi_cmd_t;
void iscsi_cmd_init();
iscsi_cmd_t *iscsi_cmd_alloc(struct iscsi_conn *c, int opcode);
iscsi_cmd_t *iscsi_cmd_find(struct iscsi_conn *c, uint32_t x,
find_type_t type);
void iscsi_cmd_free(struct iscsi_conn *c, iscsi_cmd_t *cmd);
void iscsi_cmd_cancel(struct iscsi_conn *c, iscsi_cmd_t *cmd);
void iscsi_cmd_remove(struct iscsi_conn *c, uint32_t statsn);
int iscsi_cmd_window(struct iscsi_conn *c);
void iscsi_cmd_delayed_store(iscsi_cmd_t *cmd, t10_cmd_t *t);
void iscsi_cmd_delayed_remove(iscsi_cmd_t *cmd, iscsi_delayed_t *d);
#ifdef __cplusplus
}
#endif
#endif /* _TARGET_CMD_H */