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
118 lines
3.9 KiB
C
118 lines
3.9 KiB
C
/*
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* SCSI Target Emulator
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*
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* Copyright (c) 2002 Nate Lawson.
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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 _SCSI_TARGET_H
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#define _SCSI_TARGET_H
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/*
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* Maximum number of parallel commands to accept
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* Set to 256 for Fibre Channel (SPI is 16)
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*/
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#define MAX_INITIATORS 16
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#define SECTOR_SIZE 512
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#define MAX_EVENTS (MAX_INITIATORS + 5)
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/* kqueue for AIO, signals */
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/* Additional SCSI 3 defines for inquiry response */
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#define SID_Addr16 0x0100
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TAILQ_HEAD(io_queue, ccb_hdr);
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/* Offset into the private CCB area for storing our descriptor */
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#define targ_descr periph_priv.entries[1].ptr
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/* Descriptor attached to each ATIO */
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struct atio_descr {
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off_t base_off; /* Base offset for ATIO */
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size_t total_len; /* Total xfer len for this ATIO */
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size_t init_req; /* Transfer count requested to/from init */
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size_t init_ack; /* Data transferred ok to/from init */
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size_t targ_req; /* Transfer count requested to/from target */
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size_t targ_ack; /* Data transferred ok to/from target */
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int flags; /* Flags for CTIOs */
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u_int8_t *cdb; /* Pointer to received CDB */
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/* List of completed AIO/CTIOs */
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struct io_queue cmplt_io;
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};
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typedef enum {
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ATIO_WORK,
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AIO_DONE,
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CTIO_DONE
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} io_ops;
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/* Descriptor attached to each CTIO */
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struct ctio_descr {
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void *buf; /* Backing store */
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off_t offset; /* Position in transfer (for file, */
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/* doesn't start at 0) */
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struct aiocb aiocb; /* AIO descriptor for this CTIO */
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struct ccb_accept_tio *atio;
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/* ATIO we are satisfying */
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io_ops event; /* Event that queued this CTIO */
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};
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typedef enum {
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UA_NONE = 0x00,
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UA_POWER_ON = 0x01,
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UA_BUS_RESET = 0x02,
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UA_BDR = 0x04
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} ua_types;
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typedef enum {
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CA_NONE = 0x00,
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CA_UNIT_ATTN = 0x01,
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CA_CMD_SENSE = 0x02
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} ca_types;
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struct initiator_state {
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ua_types orig_ua;
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ca_types orig_ca;
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ua_types pending_ua;
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ca_types pending_ca;
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struct scsi_sense_data sense_data;
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};
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/* Global functions */
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extern cam_status tcmd_init(u_int16_t req_inq_flags,
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u_int16_t sim_inq_flags);
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extern int tcmd_handle(struct ccb_accept_tio *atio,
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struct ccb_scsiio *ctio, io_ops event);
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extern void tcmd_sense(u_int init_id, struct ccb_scsiio *ctio,
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u_int8_t flags,
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u_int8_t asc, u_int8_t ascq);
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extern void tcmd_ua(u_int init_id, ua_types new_ua);
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extern int work_atio(struct ccb_accept_tio *atio);
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extern void send_ccb(union ccb *ccb, int priority);
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extern void free_ccb(union ccb *ccb);
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static __inline u_int min(u_int a, u_int b) { return (a < b ? a : b); }
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#endif /* _SCSI_TARGET_H */
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