freebsd-nq/share/examples/scsi_target/scsi_target.c
Justin T. Gibbs b3fae35ce8 Allocate a target mode instance to handle our target mode session, clean
it up on exit.  The address for attaching the emulator (path, target id,
lun) is now specified on the command line.  Some attempt at cathing
signals and cleaning up target mode instances is now made.
1999-03-05 23:12:02 +00:00

335 lines
7.7 KiB
C

/*
* Sample program to attach to the "targ" processor target, target mode
* peripheral driver and push or receive data.
*
* Copyright (c) 1998 Justin T. Gibbs.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification, immediately at the beginning of the file.
* 2. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: scsi_target.c,v 1.2 1998/12/10 04:00:03 gibbs Exp $
*/
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <poll.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <unistd.h>
#include <cam/scsi/scsi_all.h>
#include <cam/scsi/scsi_message.h>
#include <cam/scsi/scsi_targetio.h>
char *appname;
int ifd;
char *ifilename;
int ofd;
char *ofilename;
size_t bufsize = 64 * 1024;
void *buf;
char targdevname[80];
int targctlfd;
int targfd;
int quit;
struct ioc_alloc_unit alloc_unit = {
CAM_BUS_WILDCARD,
CAM_TARGET_WILDCARD,
CAM_LUN_WILDCARD
};
static void pump_events();
static void handle_exception();
static void quit_handler();
static void usage();
int
main(int argc, char *argv[])
{
int ch;
appname = *argv;
while ((ch = getopt(argc, argv, "i:o:p:t:l:")) != -1) {
switch(ch) {
case 'i':
if ((ifd = open(optarg, O_RDONLY)) == -1) {
perror(optarg);
exit(EX_NOINPUT);
}
ifilename = optarg;
break;
case 'o':
if ((ofd = open(optarg,
O_WRONLY|O_CREAT), 0600) == -1) {
perror(optarg);
exit(EX_CANTCREAT);
}
ofilename = optarg;
break;
case 'p':
alloc_unit.path_id = atoi(optarg);
break;
case 't':
alloc_unit.target_id = atoi(optarg);
break;
case 'l':
alloc_unit.lun_id = atoi(optarg);
break;
case '?':
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (alloc_unit.path_id == CAM_BUS_WILDCARD
|| alloc_unit.target_id == CAM_TARGET_WILDCARD
|| alloc_unit.lun_id == CAM_LUN_WILDCARD) {
fprintf(stderr, "%s: Incomplete device path specifiled\n",
appname);
usage();
/* NOTREACHED */
}
if (argc != 0) {
fprintf(stderr, "%s: Too many arguments\n", appname);
usage();
/* NOTREACHED */
}
/* Allocate a new instance */
if ((targctlfd = open("/dev/targ.ctl", O_RDWR)) == -1) {
perror("/dev/targ.ctl");
exit(EX_UNAVAILABLE);
}
if (ioctl(targctlfd, TARGCTLIOALLOCUNIT, &alloc_unit) == -1) {
perror("TARGCTLIOALLOCUNIT");
exit(EX_SOFTWARE);
}
snprintf(targdevname, sizeof(targdevname), "/dev/targ%d",
alloc_unit.unit);
if ((targfd = open(targdevname, O_RDWR)) == -1) {
perror(targdevname);
ioctl(targctlfd, TARGCTLIOFREEUNIT, &alloc_unit);
exit(EX_NOINPUT);
}
buf = malloc(bufsize);
if (buf == NULL) {
fprintf(stderr, "%s: Could not malloc I/O buffer", appname);
exit(EX_OSERR);
}
signal(SIGHUP, quit_handler);
signal(SIGINT, quit_handler);
signal(SIGTERM, quit_handler);
pump_events();
close(targfd);
if (ioctl(targctlfd, TARGCTLIOFREEUNIT, &alloc_unit) == -1) {
perror("TARGCTLIOFREEUNIT");
exit(EX_SOFTWARE);
}
close(targctlfd);
return (0);
}
static void
pump_events()
{
struct pollfd targpoll;
targpoll.fd = targfd;
targpoll.events = POLLRDNORM|POLLWRNORM;
while (quit == 0) {
int retval;
retval = poll(&targpoll, 1, INFTIM);
if (retval == -1) {
if (errno == EINTR)
continue;
perror("Poll Failed");
exit(EX_SOFTWARE);
}
if (retval == 0) {
perror("Poll returned 0 although timeout infinite???");
exit(EX_SOFTWARE);
}
if (retval > 1) {
perror("Poll returned more fds ready than allocated");
exit(EX_SOFTWARE);
}
/* Process events */
if ((targpoll.revents & POLLERR) != 0) {
handle_exception();
}
if ((targpoll.revents & POLLRDNORM) != 0) {
retval = read(targfd, buf, bufsize);
if (retval == -1) {
perror("Read from targ failed");
} else {
retval = write(ofd, buf, retval);
if (retval == -1) {
perror("Write to file failed");
}
}
}
if ((targpoll.revents & POLLWRNORM) != 0) {
int amount_read;
retval = read(ifd, buf, bufsize);
if (retval == -1) {
perror("Read from file failed");
exit(EX_SOFTWARE);
}
amount_read = retval;
retval = write(targfd, buf, retval);
if (retval == -1) {
perror("Write to targ failed");
retval = 0;
}
/* Backup in our input stream on short writes */
if (retval != amount_read)
lseek(ifd, retval - amount_read, SEEK_CUR);
}
}
}
static void
handle_exception()
{
targ_exception exceptions;
if (ioctl(targfd, TARGIOCFETCHEXCEPTION, &exceptions) == -1) {
perror("TARGIOCFETCHEXCEPTION");
exit(EX_SOFTWARE);
}
if ((exceptions & TARG_EXCEPT_DEVICE_INVALID) != 0) {
/* Device went away. Nothing more to do. */
exit(0);
}
if ((exceptions & TARG_EXCEPT_UNKNOWN_ATIO) != 0) {
struct ccb_accept_tio atio;
struct ioc_initiator_state ioc_istate;
struct scsi_sense_data *sense;
union ccb ccb;
if (ioctl(targfd, TARGIOCFETCHATIO, &atio) == -1) {
perror("TARGIOCFETCHATIO");
exit(EX_SOFTWARE);
}
printf("Ignoring unhandled command 0x%x for Id %d\n",
atio.cdb_io.cdb_bytes[0], atio.init_id);
ioc_istate.initiator_id = atio.init_id;
if (ioctl(targfd, TARGIOCGETISTATE, &ioc_istate) == -1) {
perror("TARGIOCGETISTATE");
exit(EX_SOFTWARE);
}
/* Send back Illegal Command code status */
ioc_istate.istate.pending_ca |= CA_CMD_SENSE;
sense = &ioc_istate.istate.sense_data;
bzero(sense, sizeof(*sense));
sense->error_code = SSD_CURRENT_ERROR;
sense->flags = SSD_KEY_ILLEGAL_REQUEST;
sense->add_sense_code = 0x20;
sense->add_sense_code_qual = 0x00;
sense->extra_len = offsetof(struct scsi_sense_data, fru)
- offsetof(struct scsi_sense_data, extra_len);
if (ioctl(targfd, TARGIOCSETISTATE, &ioc_istate) == -1) {
perror("TARGIOCSETISTATE");
exit(EX_SOFTWARE);
}
bzero(&ccb, sizeof(ccb));
cam_fill_ctio(&ccb.csio, /*retries*/2,
/*cbfcnp*/NULL,
/*flags*/CAM_DIR_NONE
| (atio.ccb_h.flags & CAM_TAG_ACTION_VALID)
| CAM_SEND_STATUS,
/*tag_action*/MSG_SIMPLE_Q_TAG,
atio.tag_id,
atio.init_id,
SCSI_STATUS_CHECK_COND,
/*data_ptr*/NULL,
/*dxfer_len*/0,
/*timeout*/5 * 1000);
if (ioctl(targfd, TARGIOCCOMMAND, &ccb) == -1) {
perror("TARGIOCCOMMAND");
exit(EX_SOFTWARE);
}
}
if (ioctl(targfd, TARGIOCCLEAREXCEPTION, &exceptions) == -1) {
perror("TARGIOCCLEAREXCEPTION");
exit(EX_SOFTWARE);
}
}
static void
quit_handler(int signum)
{
quit = 1;
}
static void
usage()
{
(void)fprintf(stderr,
"usage: %-16s [-o output_file] [-i input_file] -p path -t target -l lun\n",
appname);
exit(EX_USAGE);
}