scsi_target.c revision 49935 
1/*
2 * Sample program to attach to the "targ" processor target, target mode
3 * peripheral driver and push or receive data.
4 *
5 * Copyright (c) 1998 Justin T. Gibbs.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions, and the following disclaimer,
13 *    without modification, immediately at the beginning of the file.
14 * 2. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *      $Id: scsi_target.c,v 1.3 1999/03/05 23:12:02 gibbs Exp $
30 */
31
32#include <sys/types.h>
33
34#include <errno.h>
35#include <fcntl.h>
36#include <poll.h>
37#include <signal.h>
38#include <stddef.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <sysexits.h>
42#include <unistd.h>
43
44#include <cam/scsi/scsi_all.h>
45#include <cam/scsi/scsi_message.h>
46#include <cam/scsi/scsi_targetio.h>
47
48char	*appname;
49int	 ifd;
50char	*ifilename;
51int	 ofd;
52char	*ofilename;
53size_t	 bufsize = 64 * 1024;
54void	*buf;
55char	 targdevname[80];
56int	 targctlfd;
57int	 targfd;
58int	 quit;
59struct	 ioc_alloc_unit alloc_unit = {
60	CAM_BUS_WILDCARD,
61	CAM_TARGET_WILDCARD,
62	CAM_LUN_WILDCARD
63};
64
65static void pump_events();
66static void cleanup();
67static void handle_exception();
68static void quit_handler();
69static void usage();
70
71int
72main(int argc, char *argv[])
73{
74	int  ch;
75
76	appname = *argv;
77	while ((ch = getopt(argc, argv, "i:o:p:t:l:")) != -1) {
78		switch(ch) {
79		case 'i':
80			if ((ifd = open(optarg, O_RDONLY)) == -1) {
81				perror(optarg);
82				exit(EX_NOINPUT);
83			}
84			ifilename = optarg;
85			break;
86		case 'o':
87			if ((ofd = open(optarg,
88					O_WRONLY|O_CREAT), 0600) == -1) {
89				perror(optarg);
90				exit(EX_CANTCREAT);
91			}
92			ofilename = optarg;
93			break;
94		case 'p':
95			alloc_unit.path_id = atoi(optarg);
96			break;
97		case 't':
98			alloc_unit.target_id = atoi(optarg);
99			break;
100		case 'l':
101			alloc_unit.lun_id = atoi(optarg);
102			break;
103		case '?':
104		default:
105			usage();
106			/* NOTREACHED */
107		}
108	}
109	argc -= optind;
110	argv += optind;
111
112	if (alloc_unit.path_id == CAM_BUS_WILDCARD
113	 || alloc_unit.target_id == CAM_TARGET_WILDCARD
114	 || alloc_unit.lun_id == CAM_LUN_WILDCARD) {
115		fprintf(stderr, "%s: Incomplete device path specifiled\n",
116			appname);
117		usage();
118		/* NOTREACHED */
119	}
120
121	if (argc != 0) {
122		fprintf(stderr, "%s: Too many arguments\n", appname);
123		usage();
124		/* NOTREACHED */
125	}
126
127	/* Allocate a new instance */
128	if ((targctlfd = open("/dev/targ.ctl", O_RDWR)) == -1) {
129		perror("/dev/targ.ctl");
130		exit(EX_UNAVAILABLE);
131	}
132
133	if (ioctl(targctlfd, TARGCTLIOALLOCUNIT, &alloc_unit) == -1) {
134		perror("TARGCTLIOALLOCUNIT");
135		exit(EX_SOFTWARE);
136	}
137
138	snprintf(targdevname, sizeof(targdevname), "/dev/targ%d",
139		 alloc_unit.unit);
140
141	if ((targfd = open(targdevname, O_RDWR)) == -1) {
142		perror(targdevname);
143		ioctl(targctlfd, TARGCTLIOFREEUNIT, &alloc_unit);
144		exit(EX_NOINPUT);
145	}
146
147	buf = malloc(bufsize);
148
149	if (buf == NULL) {
150		fprintf(stderr, "%s: Could not malloc I/O buffer", appname);
151		exit(EX_OSERR);
152	}
153
154	signal(SIGHUP, quit_handler);
155	signal(SIGINT, quit_handler);
156	signal(SIGTERM, quit_handler);
157
158	atexit(cleanup);
159
160	pump_events();
161
162	return (0);
163}
164
165static void
166cleanup()
167{
168	close(targfd);
169
170	if (ioctl(targctlfd, TARGCTLIOFREEUNIT, &alloc_unit) == -1) {
171		perror("TARGCTLIOFREEUNIT");
172		exit(EX_SOFTWARE);
173	}
174
175	close(targctlfd);
176}
177
178static void
179pump_events()
180{
181	struct pollfd targpoll;
182
183	targpoll.fd = targfd;
184	targpoll.events = POLLRDNORM|POLLWRNORM;
185
186	while (quit == 0) {
187		int retval;
188
189		retval = poll(&targpoll, 1, INFTIM);
190
191		if (retval == -1) {
192			if (errno == EINTR)
193				continue;
194			perror("Poll Failed");
195			exit(EX_SOFTWARE);
196		}
197
198		if (retval == 0) {
199			perror("Poll returned 0 although timeout infinite???");
200			exit(EX_SOFTWARE);
201		}
202
203		if (retval > 1) {
204			perror("Poll returned more fds ready than allocated");
205			exit(EX_SOFTWARE);
206		}
207
208		/* Process events */
209		if ((targpoll.revents & POLLERR) != 0) {
210			handle_exception();
211		}
212
213		if ((targpoll.revents & POLLRDNORM) != 0) {
214			retval = read(targfd, buf, bufsize);
215
216			if (retval == -1) {
217				perror("Read from targ failed");
218				/* Go look for exceptions */
219				continue;
220			} else {
221				retval = write(ofd, buf, retval);
222				if (retval == -1) {
223					perror("Write to file failed");
224				}
225			}
226		}
227
228		if ((targpoll.revents & POLLWRNORM) != 0) {
229			int amount_read;
230
231			retval = read(ifd, buf, bufsize);
232			if (retval == -1) {
233				perror("Read from file failed");
234				exit(EX_SOFTWARE);
235			}
236
237			amount_read = retval;
238			retval = write(targfd, buf, retval);
239			if (retval == -1) {
240				perror("Write to targ failed");
241				retval = 0;
242			}
243
244			/* Backup in our input stream on short writes */
245			if (retval != amount_read)
246				lseek(ifd, retval - amount_read, SEEK_CUR);
247		}
248	}
249}
250
251static void
252handle_exception()
253{
254	targ_exception exceptions;
255
256	if (ioctl(targfd, TARGIOCFETCHEXCEPTION, &exceptions) == -1) {
257		perror("TARGIOCFETCHEXCEPTION");
258		exit(EX_SOFTWARE);
259	}
260
261	printf("Saw exceptions %x\n", exceptions);
262	if ((exceptions & TARG_EXCEPT_DEVICE_INVALID) != 0) {
263		/* Device went away.  Nothing more to do. */
264		printf("Device went away\n");
265		exit(0);
266	}
267
268	if ((exceptions & TARG_EXCEPT_UNKNOWN_ATIO) != 0) {
269		struct ccb_accept_tio atio;
270		struct ioc_initiator_state ioc_istate;
271		struct scsi_sense_data *sense;
272		union  ccb ccb;
273
274		if (ioctl(targfd, TARGIOCFETCHATIO, &atio) == -1) {
275			perror("TARGIOCFETCHATIO");
276			exit(EX_SOFTWARE);
277		}
278
279		printf("Ignoring unhandled command 0x%x for Id %d\n",
280		       atio.cdb_io.cdb_bytes[0], atio.init_id);
281
282		ioc_istate.initiator_id = atio.init_id;
283		if (ioctl(targfd, TARGIOCGETISTATE, &ioc_istate) == -1) {
284			perror("TARGIOCGETISTATE");
285			exit(EX_SOFTWARE);
286		}
287
288		/* Send back Illegal Command code status */
289		ioc_istate.istate.pending_ca |= CA_CMD_SENSE;
290		sense = &ioc_istate.istate.sense_data;
291		bzero(sense, sizeof(*sense));
292		sense->error_code = SSD_CURRENT_ERROR;
293		sense->flags = SSD_KEY_ILLEGAL_REQUEST;
294		sense->add_sense_code = 0x20;
295		sense->add_sense_code_qual = 0x00;
296		sense->extra_len = offsetof(struct scsi_sense_data, fru)
297				 - offsetof(struct scsi_sense_data, extra_len);
298
299		if (ioctl(targfd, TARGIOCSETISTATE, &ioc_istate) == -1) {
300			perror("TARGIOCSETISTATE");
301			exit(EX_SOFTWARE);
302		}
303
304		bzero(&ccb, sizeof(ccb));
305		cam_fill_ctio(&ccb.csio, /*retries*/2,
306			      /*cbfcnp*/NULL,
307			      /*flags*/CAM_DIR_NONE
308			     | (atio.ccb_h.flags & CAM_TAG_ACTION_VALID)
309			     | CAM_SEND_STATUS,
310                              /*tag_action*/MSG_SIMPLE_Q_TAG,
311			      atio.tag_id,
312			      atio.init_id,
313			      SCSI_STATUS_CHECK_COND,
314			      /*data_ptr*/NULL,
315			      /*dxfer_len*/0,
316			      /*timeout*/5 * 1000);
317		if (ioctl(targfd, TARGIOCCOMMAND, &ccb) == -1) {
318			perror("TARGIOCCOMMAND");
319			exit(EX_SOFTWARE);
320		}
321
322	}
323
324	if (ioctl(targfd, TARGIOCCLEAREXCEPTION, &exceptions) == -1) {
325		perror("TARGIOCCLEAREXCEPTION");
326		exit(EX_SOFTWARE);
327	}
328}
329
330static void
331quit_handler(int signum)
332{
333	quit = 1;
334}
335
336static void
337usage()
338{
339
340	(void)fprintf(stderr,
341"usage: %-16s [-o output_file] [-i input_file] -p path -t target -l lun\n",
342		      appname);
343
344	exit(EX_USAGE);
345}
346
347