c38b150ae4
This code allows a user program to enable target mode on a SIM and then emulate any number of devices (disks, tape drives, etc.) All decisions about device behavior (UA, CA, inquiry response) are left to the usermode program and the kernel driver is merely a conduit for CCBs. This enables multiple concurrent target emulators, each using its own backing store and IO model. Also included is a user program that emulates a disk (RBC) using a file as a backing store. This provides functionality similar to md(4) at the CAM layer. Code has been tested on ahc(4) and should also work on isp(4) (and other SIMs that gain target mode support). It is a complete rewrite of /sys/cam/scsi_target* and /usr/share/examples/scsi_target. Design, comments from: gibbs Supported by: Cryptography Research Approved by: re
78 lines
2.8 KiB
C
78 lines
2.8 KiB
C
/*
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* Ioctl definitions for the SCSI Target Driver
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*
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* Copyright (c) 2002 Nate Lawson.
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* Copyright (c) 1998 Justin T. Gibbs.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification, immediately at the beginning of the file.
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* 2. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _CAM_SCSI_SCSI_TARGETIO_H_
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#define _CAM_SCSI_SCSI_TARGETIO_H_
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#ifndef _KERNEL
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#include <sys/types.h>
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#endif
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#include <sys/ioccom.h>
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#include <cam/cam.h>
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#include <cam/cam_ccb.h>
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/*
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* CCBs (ATIO, CTIO, INOT, REL_SIMQ) are sent to the kernel driver
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* by writing one or more pointers. The user receives notification
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* of CCB completion through poll/select/kqueue and then calls
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* read(2) which outputs pointers to the completed CCBs.
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*/
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/*
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* Enable and disable a target mode instance. For enabling, the path_id,
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* target_id, and lun_id fields must be set. The grp6/7_len fields
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* specify the length of vendor-specific CDBs the target expects and
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* should normally be set to 0. On successful completion
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* of enable, the specified target instance will answer selection.
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* Disable causes the target instance to abort any outstanding commands
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* and stop accepting new ones. The aborted CCBs will be returned to
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* the user via read(2) or discarded if the user closes the device.
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* The user can then re-enable the device for a new path.
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*/
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struct ioc_enable_lun {
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path_id_t path_id;
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target_id_t target_id;
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lun_id_t lun_id;
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int grp6_len;
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int grp7_len;
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};
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#define TARGIOCENABLE _IOW('C', 5, struct ioc_enable_lun)
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#define TARGIOCDISABLE _IO('C', 6)
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/*
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* Set/clear debugging for this target mode instance
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*/
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#define TARGIOCDEBUG _IOW('C', 7, int)
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TAILQ_HEAD(ccb_queue, ccb_hdr);
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#endif /* _CAM_SCSI_SCSI_TARGETIO_H_ */
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