1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * SCSI Disk Emulator
5 *
6 * Copyright (c) 2002 Nate Lawson.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions, and the following disclaimer,
14 * without modification, immediately at the beginning of the file.
15 * 2. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * $FreeBSD$
31 */
32
33 #include <sys/types.h>
34 #include <ctype.h>
35 #include <errno.h>
36 #include <err.h>
37 #include <fcntl.h>
38 #include <signal.h>
39 #include <stddef.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <sysexits.h>
44 #include <unistd.h>
45 #include <aio.h>
46 #include <assert.h>
47 #include <sys/stat.h>
48 #include <sys/queue.h>
49 #include <sys/event.h>
50 #include <sys/param.h>
51 #include <sys/disk.h>
52 #include <cam/cam_queue.h>
53 #include <cam/scsi/scsi_all.h>
54 #include <cam/scsi/scsi_targetio.h>
55 #include <cam/scsi/scsi_message.h>
56 #include "scsi_target.h"
57
58 /* Maximum amount to transfer per CTIO */
59 #define MAX_XFER MAXPHYS
60 /* Maximum number of allocated CTIOs */
61 #define MAX_CTIOS 64
62 /* Maximum sector size for emulated volume */
63 #define MAX_SECTOR 32768
64
65 /* Global variables */
66 int debug;
67 int notaio = 0;
68 off_t volume_size;
69 u_int sector_size;
70 size_t buf_size;
71
72 /* Local variables */
73 static int targ_fd;
74 static int kq_fd;
75 static int file_fd;
76 static int num_ctios;
77 static struct ccb_queue pending_queue;
78 static struct ccb_queue work_queue;
79 static struct ioc_enable_lun ioc_enlun = {
80 CAM_BUS_WILDCARD,
81 CAM_TARGET_WILDCARD,
82 CAM_LUN_WILDCARD
83 };
84
85 /* Local functions */
86 static void cleanup(void);
87 static int init_ccbs(void);
88 static void request_loop(void);
89 static void handle_read(void);
90 /* static int work_atio(struct ccb_accept_tio *); */
91 static void queue_io(struct ccb_scsiio *);
92 static int run_queue(struct ccb_accept_tio *);
93 static int work_inot(struct ccb_immediate_notify *);
94 static struct ccb_scsiio *
95 get_ctio(void);
96 /* static void free_ccb(union ccb *); */
97 static cam_status get_sim_flags(u_int16_t *);
98 static void rel_simq(void);
99 static void abort_all_pending(void);
100 static void usage(void);
101
102 int
main(int argc,char * argv[])103 main(int argc, char *argv[])
104 {
105 int ch;
106 char *file_name;
107 u_int16_t req_flags, sim_flags;
108 off_t user_size;
109
110 /* Initialize */
111 debug = 0;
112 req_flags = sim_flags = 0;
113 user_size = 0;
114 targ_fd = file_fd = kq_fd = -1;
115 num_ctios = 0;
116 sector_size = SECTOR_SIZE;
117 buf_size = DFLTPHYS;
118
119 /* Prepare resource pools */
120 TAILQ_INIT(&pending_queue);
121 TAILQ_INIT(&work_queue);
122
123 while ((ch = getopt(argc, argv, "AdSTYb:c:s:W:")) != -1) {
124 switch(ch) {
125 case 'A':
126 req_flags |= SID_Addr16;
127 break;
128 case 'd':
129 debug = 1;
130 break;
131 case 'S':
132 req_flags |= SID_Sync;
133 break;
134 case 'T':
135 req_flags |= SID_CmdQue;
136 break;
137 case 'b':
138 buf_size = atoi(optarg);
139 if (buf_size < 256 || buf_size > MAX_XFER)
140 errx(1, "Unreasonable buf size: %s", optarg);
141 break;
142 case 'c':
143 sector_size = atoi(optarg);
144 if (sector_size < 512 || sector_size > MAX_SECTOR)
145 errx(1, "Unreasonable sector size: %s", optarg);
146 break;
147 case 's':
148 {
149 int last, shift = 0;
150
151 last = strlen(optarg) - 1;
152 if (last > 0) {
153 switch (tolower(optarg[last])) {
154 case 'e':
155 shift += 10;
156 /* FALLTHROUGH */
157 case 'p':
158 shift += 10;
159 /* FALLTHROUGH */
160 case 't':
161 shift += 10;
162 /* FALLTHROUGH */
163 case 'g':
164 shift += 10;
165 /* FALLTHROUGH */
166 case 'm':
167 shift += 10;
168 /* FALLTHROUGH */
169 case 'k':
170 shift += 10;
171 optarg[last] = 0;
172 break;
173 }
174 }
175 user_size = strtoll(optarg, (char **)NULL, /*base*/10);
176 user_size <<= shift;
177 if (user_size < 0)
178 errx(1, "Unreasonable volume size: %s", optarg);
179 break;
180 }
181 case 'W':
182 req_flags &= ~(SID_WBus16 | SID_WBus32);
183 switch (atoi(optarg)) {
184 case 8:
185 /* Leave req_flags zeroed */
186 break;
187 case 16:
188 req_flags |= SID_WBus16;
189 break;
190 case 32:
191 req_flags |= SID_WBus32;
192 break;
193 default:
194 warnx("Width %s not supported", optarg);
195 usage();
196 /* NOTREACHED */
197 }
198 break;
199 case 'Y':
200 notaio = 1;
201 break;
202 default:
203 usage();
204 /* NOTREACHED */
205 }
206 }
207 argc -= optind;
208 argv += optind;
209
210 if (argc != 2)
211 usage();
212
213 sscanf(argv[0], "%u:%u:%u", &ioc_enlun.path_id, &ioc_enlun.target_id,
214 &ioc_enlun.lun_id);
215 file_name = argv[1];
216
217 if (ioc_enlun.path_id == CAM_BUS_WILDCARD ||
218 ioc_enlun.target_id == CAM_TARGET_WILDCARD ||
219 ioc_enlun.lun_id == CAM_LUN_WILDCARD) {
220 warnx("Incomplete target path specified");
221 usage();
222 /* NOTREACHED */
223 }
224 /* We don't support any vendor-specific commands */
225 ioc_enlun.grp6_len = 0;
226 ioc_enlun.grp7_len = 0;
227
228 /* Open backing store for IO */
229 file_fd = open(file_name, O_RDWR);
230 if (file_fd < 0)
231 errx(EX_NOINPUT, "open backing store file");
232
233 /* Check backing store size or use the size user gave us */
234 if (user_size == 0) {
235 struct stat st;
236
237 if (fstat(file_fd, &st) < 0)
238 err(1, "fstat file");
239 #if __FreeBSD_version >= 500000
240 if ((st.st_mode & S_IFCHR) != 0) {
241 /* raw device */
242 off_t mediasize;
243 if (ioctl(file_fd, DIOCGMEDIASIZE, &mediasize) < 0)
244 err(1, "DIOCGMEDIASIZE");
245
246 /* XXX get sector size by ioctl()?? */
247 volume_size = mediasize / sector_size;
248 } else
249 #endif
250 volume_size = st.st_size / sector_size;
251 } else {
252 volume_size = user_size / sector_size;
253 }
254 if (debug)
255 warnx("volume_size: %d bytes x " OFF_FMT " sectors",
256 sector_size, volume_size);
257
258 if (volume_size <= 0)
259 errx(1, "volume must be larger than %d", sector_size);
260
261 if (notaio == 0) {
262 struct aiocb aio, *aiop;
263
264 /* See if we have we have working AIO support */
265 memset(&aio, 0, sizeof(aio));
266 aio.aio_buf = malloc(sector_size);
267 if (aio.aio_buf == NULL)
268 err(1, "malloc");
269 aio.aio_fildes = file_fd;
270 aio.aio_offset = 0;
271 aio.aio_nbytes = sector_size;
272 signal(SIGSYS, SIG_IGN);
273 if (aio_read(&aio) != 0) {
274 printf("AIO support is not available- switchin to"
275 " single-threaded mode.\n");
276 notaio = 1;
277 } else {
278 if (aio_waitcomplete(&aiop, NULL) != sector_size)
279 err(1, "aio_waitcomplete");
280 assert(aiop == &aio);
281 signal(SIGSYS, SIG_DFL);
282 }
283 free((void *)aio.aio_buf);
284 if (debug && notaio == 0)
285 warnx("aio support tested ok");
286 }
287
288 targ_fd = open("/dev/targ", O_RDWR);
289 if (targ_fd < 0)
290 err(1, "/dev/targ");
291 else
292 warnx("opened /dev/targ");
293
294 /* The first three are handled by kevent() later */
295 signal(SIGHUP, SIG_IGN);
296 signal(SIGINT, SIG_IGN);
297 signal(SIGTERM, SIG_IGN);
298 signal(SIGPROF, SIG_IGN);
299 signal(SIGALRM, SIG_IGN);
300 signal(SIGSTOP, SIG_IGN);
301 signal(SIGTSTP, SIG_IGN);
302
303 /* Register a cleanup handler to run when exiting */
304 atexit(cleanup);
305
306 /* Enable listening on the specified LUN */
307 if (ioctl(targ_fd, TARGIOCENABLE, &ioc_enlun) != 0)
308 err(1, "TARGIOCENABLE");
309
310 /* Enable debugging if requested */
311 if (debug) {
312 if (ioctl(targ_fd, TARGIOCDEBUG, &debug) != 0)
313 warnx("TARGIOCDEBUG");
314 }
315
316 /* Set up inquiry data according to what SIM supports */
317 if (get_sim_flags(&sim_flags) != CAM_REQ_CMP)
318 errx(1, "get_sim_flags");
319
320 if (tcmd_init(req_flags, sim_flags) != 0)
321 errx(1, "Initializing tcmd subsystem failed");
322
323 /* Queue ATIOs and INOTs on descriptor */
324 if (init_ccbs() != 0)
325 errx(1, "init_ccbs failed");
326
327 if (debug)
328 warnx("main loop beginning");
329
330 request_loop();
331
332 exit(0);
333 }
334
335 static void
cleanup()336 cleanup()
337 {
338 struct ccb_hdr *ccb_h;
339
340 if (debug) {
341 warnx("cleanup called");
342 debug = 0;
343 ioctl(targ_fd, TARGIOCDEBUG, &debug);
344 }
345 ioctl(targ_fd, TARGIOCDISABLE, NULL);
346 close(targ_fd);
347
348 while ((ccb_h = TAILQ_FIRST(&pending_queue)) != NULL) {
349 TAILQ_REMOVE(&pending_queue, ccb_h, periph_links.tqe);
350 free_ccb((union ccb *)ccb_h);
351 }
352 while ((ccb_h = TAILQ_FIRST(&work_queue)) != NULL) {
353 TAILQ_REMOVE(&work_queue, ccb_h, periph_links.tqe);
354 free_ccb((union ccb *)ccb_h);
355 }
356
357 if (kq_fd != -1)
358 close(kq_fd);
359 }
360
361 /* Allocate ATIOs/INOTs and queue on HBA */
362 static int
init_ccbs()363 init_ccbs()
364 {
365 int i;
366
367 for (i = 0; i < MAX_INITIATORS; i++) {
368 struct ccb_accept_tio *atio;
369 struct atio_descr *a_descr;
370 struct ccb_immediate_notify *inot;
371
372 atio = (struct ccb_accept_tio *)malloc(sizeof(*atio));
373 if (atio == NULL) {
374 warn("malloc ATIO");
375 return (-1);
376 }
377 a_descr = (struct atio_descr *)malloc(sizeof(*a_descr));
378 if (a_descr == NULL) {
379 free(atio);
380 warn("malloc atio_descr");
381 return (-1);
382 }
383 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO;
384 atio->ccb_h.targ_descr = a_descr;
385 send_ccb((union ccb *)atio, /*priority*/1);
386
387 inot = (struct ccb_immediate_notify *)malloc(sizeof(*inot));
388 if (inot == NULL) {
389 warn("malloc INOT");
390 return (-1);
391 }
392 inot->ccb_h.func_code = XPT_IMMEDIATE_NOTIFY;
393 send_ccb((union ccb *)inot, /*priority*/1);
394 }
395
396 return (0);
397 }
398
399 static void
request_loop()400 request_loop()
401 {
402 struct kevent events[MAX_EVENTS];
403 struct timespec ts, *tptr;
404 int quit;
405
406 /* Register kqueue for event notification */
407 if ((kq_fd = kqueue()) < 0)
408 err(1, "init kqueue");
409
410 /* Set up some default events */
411 EV_SET(&events[0], SIGHUP, EVFILT_SIGNAL, EV_ADD|EV_ENABLE, 0, 0, 0);
412 EV_SET(&events[1], SIGINT, EVFILT_SIGNAL, EV_ADD|EV_ENABLE, 0, 0, 0);
413 EV_SET(&events[2], SIGTERM, EVFILT_SIGNAL, EV_ADD|EV_ENABLE, 0, 0, 0);
414 EV_SET(&events[3], targ_fd, EVFILT_READ, EV_ADD|EV_ENABLE, 0, 0, 0);
415 if (kevent(kq_fd, events, 4, NULL, 0, NULL) < 0)
416 err(1, "kevent signal registration");
417
418 ts.tv_sec = 0;
419 ts.tv_nsec = 0;
420 tptr = NULL;
421 quit = 0;
422
423 /* Loop until user signal */
424 while (quit == 0) {
425 int retval, i, oo;
426 struct ccb_hdr *ccb_h;
427
428 /* Check for the next signal, read ready, or AIO completion */
429 retval = kevent(kq_fd, NULL, 0, events, MAX_EVENTS, tptr);
430 if (retval < 0) {
431 if (errno == EINTR) {
432 if (debug)
433 warnx("EINTR, looping");
434 continue;
435 }
436 else {
437 err(1, "kevent failed");
438 }
439 } else if (retval > MAX_EVENTS) {
440 errx(1, "kevent returned more events than allocated?");
441 }
442
443 /* Process all received events. */
444 for (oo = i = 0; i < retval; i++) {
445 if ((events[i].flags & EV_ERROR) != 0)
446 errx(1, "kevent registration failed");
447
448 switch (events[i].filter) {
449 case EVFILT_READ:
450 if (debug)
451 warnx("read ready");
452 handle_read();
453 break;
454 case EVFILT_AIO:
455 {
456 struct ccb_scsiio *ctio;
457 struct ctio_descr *c_descr;
458 if (debug)
459 warnx("aio ready");
460
461 ctio = (struct ccb_scsiio *)events[i].udata;
462 c_descr = (struct ctio_descr *)
463 ctio->ccb_h.targ_descr;
464 c_descr->event = AIO_DONE;
465 /* Queue on the appropriate ATIO */
466 queue_io(ctio);
467 /* Process any queued completions. */
468 oo += run_queue(c_descr->atio);
469 break;
470 }
471 case EVFILT_SIGNAL:
472 if (debug)
473 warnx("signal ready, setting quit");
474 quit = 1;
475 break;
476 default:
477 warnx("unknown event %d", events[i].filter);
478 break;
479 }
480
481 if (debug)
482 warnx("event %d done", events[i].filter);
483 }
484
485 if (oo) {
486 tptr = &ts;
487 continue;
488 }
489
490 /* Grab the first CCB and perform one work unit. */
491 if ((ccb_h = TAILQ_FIRST(&work_queue)) != NULL) {
492 union ccb *ccb;
493
494 ccb = (union ccb *)ccb_h;
495 switch (ccb_h->func_code) {
496 case XPT_ACCEPT_TARGET_IO:
497 /* Start one more transfer. */
498 retval = work_atio(&ccb->atio);
499 break;
500 case XPT_IMMEDIATE_NOTIFY:
501 retval = work_inot(&ccb->cin1);
502 break;
503 default:
504 warnx("Unhandled ccb type %#x on workq",
505 ccb_h->func_code);
506 abort();
507 /* NOTREACHED */
508 }
509
510 /* Assume work function handled the exception */
511 if ((ccb_h->status & CAM_DEV_QFRZN) != 0) {
512 if (debug) {
513 warnx("Queue frozen receiving CCB, "
514 "releasing");
515 }
516 rel_simq();
517 }
518
519 /* No more work needed for this command. */
520 if (retval == 0) {
521 TAILQ_REMOVE(&work_queue, ccb_h,
522 periph_links.tqe);
523 }
524 }
525
526 /*
527 * Poll for new events (i.e. completions) while we
528 * are processing CCBs on the work_queue. Once it's
529 * empty, use an infinite wait.
530 */
531 if (!TAILQ_EMPTY(&work_queue))
532 tptr = &ts;
533 else
534 tptr = NULL;
535 }
536 }
537
538 /* CCBs are ready from the kernel */
539 static void
handle_read()540 handle_read()
541 {
542 union ccb *ccb_array[MAX_INITIATORS], *ccb;
543 int ccb_count, i, oo;
544
545 ccb_count = read(targ_fd, ccb_array, sizeof(ccb_array));
546 if (ccb_count <= 0) {
547 warn("read ccb ptrs");
548 return;
549 }
550 ccb_count /= sizeof(union ccb *);
551 if (ccb_count < 1) {
552 warnx("truncated read ccb ptr?");
553 return;
554 }
555
556 for (i = 0; i < ccb_count; i++) {
557 ccb = ccb_array[i];
558 TAILQ_REMOVE(&pending_queue, &ccb->ccb_h, periph_links.tqe);
559
560 switch (ccb->ccb_h.func_code) {
561 case XPT_ACCEPT_TARGET_IO:
562 {
563 struct ccb_accept_tio *atio;
564 struct atio_descr *a_descr;
565
566 /* Initialize ATIO descr for this transaction */
567 atio = &ccb->atio;
568 a_descr = (struct atio_descr *)atio->ccb_h.targ_descr;
569 bzero(a_descr, sizeof(*a_descr));
570 TAILQ_INIT(&a_descr->cmplt_io);
571 a_descr->flags = atio->ccb_h.flags &
572 (CAM_DIS_DISCONNECT | CAM_TAG_ACTION_VALID);
573 /* XXX add a_descr->priority */
574 if ((atio->ccb_h.flags & CAM_CDB_POINTER) == 0)
575 a_descr->cdb = atio->cdb_io.cdb_bytes;
576 else
577 a_descr->cdb = atio->cdb_io.cdb_ptr;
578
579 /* ATIOs are processed in FIFO order */
580 TAILQ_INSERT_TAIL(&work_queue, &ccb->ccb_h,
581 periph_links.tqe);
582 break;
583 }
584 case XPT_CONT_TARGET_IO:
585 {
586 struct ccb_scsiio *ctio;
587 struct ctio_descr *c_descr;
588
589 ctio = &ccb->ctio;
590 c_descr = (struct ctio_descr *)ctio->ccb_h.targ_descr;
591 c_descr->event = CTIO_DONE;
592 /* Queue on the appropriate ATIO */
593 queue_io(ctio);
594 /* Process any queued completions. */
595 oo += run_queue(c_descr->atio);
596 break;
597 }
598 case XPT_IMMEDIATE_NOTIFY:
599 /* INOTs are handled with priority */
600 TAILQ_INSERT_HEAD(&work_queue, &ccb->ccb_h,
601 periph_links.tqe);
602 break;
603 default:
604 warnx("Unhandled ccb type %#x in handle_read",
605 ccb->ccb_h.func_code);
606 break;
607 }
608 }
609 }
610
611 /* Process an ATIO CCB from the kernel */
612 int
work_atio(struct ccb_accept_tio * atio)613 work_atio(struct ccb_accept_tio *atio)
614 {
615 struct ccb_scsiio *ctio;
616 struct atio_descr *a_descr;
617 struct ctio_descr *c_descr;
618 cam_status status;
619 int ret;
620
621 if (debug)
622 warnx("Working on ATIO %p", atio);
623
624 a_descr = (struct atio_descr *)atio->ccb_h.targ_descr;
625
626 /* Get a CTIO and initialize it according to our known parameters */
627 ctio = get_ctio();
628 if (ctio == NULL) {
629 return (1);
630 }
631 ret = 0;
632 ctio->ccb_h.flags = a_descr->flags;
633 ctio->tag_id = atio->tag_id;
634 ctio->init_id = atio->init_id;
635 /* XXX priority needs to be added to a_descr */
636 c_descr = (struct ctio_descr *)ctio->ccb_h.targ_descr;
637 c_descr->atio = atio;
638 if ((a_descr->flags & CAM_DIR_IN) != 0)
639 c_descr->offset = a_descr->base_off + a_descr->targ_req;
640 else if ((a_descr->flags & CAM_DIR_MASK) == CAM_DIR_OUT)
641 c_descr->offset = a_descr->base_off + a_descr->init_req;
642 else
643 c_descr->offset = a_descr->base_off;
644
645 /*
646 * Return a check condition if there was an error while
647 * receiving this ATIO.
648 */
649 if (atio->sense_len != 0) {
650 struct scsi_sense_data_fixed *sense;
651
652 if (debug) {
653 warnx("ATIO with %u bytes sense received",
654 atio->sense_len);
655 }
656 sense = (struct scsi_sense_data_fixed *)&atio->sense_data;
657 tcmd_sense(ctio->init_id, ctio, sense->flags,
658 sense->add_sense_code, sense->add_sense_code_qual);
659 send_ccb((union ccb *)ctio, /*priority*/1);
660 return (0);
661 }
662
663 status = atio->ccb_h.status & CAM_STATUS_MASK;
664 switch (status) {
665 case CAM_CDB_RECVD:
666 ret = tcmd_handle(atio, ctio, ATIO_WORK);
667 break;
668 case CAM_REQ_ABORTED:
669 warn("ATIO %p aborted", a_descr);
670 /* Requeue on HBA */
671 TAILQ_REMOVE(&work_queue, &atio->ccb_h, periph_links.tqe);
672 send_ccb((union ccb *)atio, /*priority*/1);
673 ret = 1;
674 break;
675 default:
676 warnx("ATIO completed with unhandled status %#x", status);
677 abort();
678 /* NOTREACHED */
679 break;
680 }
681
682 return (ret);
683 }
684
685 static void
queue_io(struct ccb_scsiio * ctio)686 queue_io(struct ccb_scsiio *ctio)
687 {
688 struct ccb_hdr *ccb_h;
689 struct io_queue *ioq;
690 struct ctio_descr *c_descr;
691
692 c_descr = (struct ctio_descr *)ctio->ccb_h.targ_descr;
693 if (c_descr->atio == NULL) {
694 errx(1, "CTIO %p has NULL ATIO", ctio);
695 }
696 ioq = &((struct atio_descr *)c_descr->atio->ccb_h.targ_descr)->cmplt_io;
697
698 if (TAILQ_EMPTY(ioq)) {
699 TAILQ_INSERT_HEAD(ioq, &ctio->ccb_h, periph_links.tqe);
700 return;
701 }
702
703 TAILQ_FOREACH_REVERSE(ccb_h, ioq, io_queue, periph_links.tqe) {
704 struct ctio_descr *curr_descr =
705 (struct ctio_descr *)ccb_h->targ_descr;
706 if (curr_descr->offset <= c_descr->offset) {
707 break;
708 }
709 }
710
711 if (ccb_h) {
712 TAILQ_INSERT_AFTER(ioq, ccb_h, &ctio->ccb_h, periph_links.tqe);
713 } else {
714 TAILQ_INSERT_HEAD(ioq, &ctio->ccb_h, periph_links.tqe);
715 }
716 }
717
718 /*
719 * Go through all completed AIO/CTIOs for a given ATIO and advance data
720 * counts, start continuation IO, etc.
721 */
722 static int
run_queue(struct ccb_accept_tio * atio)723 run_queue(struct ccb_accept_tio *atio)
724 {
725 struct atio_descr *a_descr;
726 struct ccb_hdr *ccb_h;
727 int sent_status, event;
728
729 if (atio == NULL)
730 return (0);
731
732 a_descr = (struct atio_descr *)atio->ccb_h.targ_descr;
733
734 while ((ccb_h = TAILQ_FIRST(&a_descr->cmplt_io)) != NULL) {
735 struct ccb_scsiio *ctio;
736 struct ctio_descr *c_descr;
737
738 ctio = (struct ccb_scsiio *)ccb_h;
739 c_descr = (struct ctio_descr *)ctio->ccb_h.targ_descr;
740
741 if (ctio->ccb_h.status == CAM_REQ_ABORTED) {
742 TAILQ_REMOVE(&a_descr->cmplt_io, ccb_h,
743 periph_links.tqe);
744 free_ccb((union ccb *)ctio);
745 send_ccb((union ccb *)atio, /*priority*/1);
746 continue;
747 }
748
749 /* If completed item is in range, call handler */
750 if ((c_descr->event == AIO_DONE &&
751 c_descr->offset == a_descr->base_off + a_descr->targ_ack)
752 || (c_descr->event == CTIO_DONE &&
753 c_descr->offset == a_descr->base_off + a_descr->init_ack)) {
754 sent_status = (ccb_h->flags & CAM_SEND_STATUS) != 0;
755 event = c_descr->event;
756
757 TAILQ_REMOVE(&a_descr->cmplt_io, ccb_h,
758 periph_links.tqe);
759 tcmd_handle(atio, ctio, c_descr->event);
760
761 /* If entire transfer complete, send back ATIO */
762 if (sent_status != 0 && event == CTIO_DONE)
763 send_ccb((union ccb *)atio, /*priority*/1);
764 } else {
765 /* Gap in offsets so wait until later callback */
766 if (/* debug */ 1)
767 warnx("IO %p:%p out of order %s", ccb_h,
768 a_descr, c_descr->event == AIO_DONE?
769 "aio" : "ctio");
770 return (1);
771 }
772 }
773 return (0);
774 }
775
776 static int
work_inot(struct ccb_immediate_notify * inot)777 work_inot(struct ccb_immediate_notify *inot)
778 {
779 cam_status status;
780
781 if (debug)
782 warnx("Working on INOT %p", inot);
783
784 status = inot->ccb_h.status;
785 status &= CAM_STATUS_MASK;
786
787 switch (status) {
788 case CAM_SCSI_BUS_RESET:
789 tcmd_ua(CAM_TARGET_WILDCARD, UA_BUS_RESET);
790 abort_all_pending();
791 break;
792 case CAM_BDR_SENT:
793 tcmd_ua(CAM_TARGET_WILDCARD, UA_BDR);
794 abort_all_pending();
795 break;
796 case CAM_MESSAGE_RECV:
797 switch (inot->arg) {
798 case MSG_TASK_COMPLETE:
799 case MSG_INITIATOR_DET_ERR:
800 case MSG_ABORT_TASK_SET:
801 case MSG_MESSAGE_REJECT:
802 case MSG_NOOP:
803 case MSG_PARITY_ERROR:
804 case MSG_TARGET_RESET:
805 case MSG_ABORT_TASK:
806 case MSG_CLEAR_TASK_SET:
807 default:
808 warnx("INOT message %#x", inot->arg);
809 break;
810 }
811 break;
812 case CAM_REQ_ABORTED:
813 warnx("INOT %p aborted", inot);
814 break;
815 default:
816 warnx("Unhandled INOT status %#x", status);
817 break;
818 }
819
820 /* Requeue on SIM */
821 TAILQ_REMOVE(&work_queue, &inot->ccb_h, periph_links.tqe);
822 send_ccb((union ccb *)inot, /*priority*/1);
823
824 return (1);
825 }
826
827 void
send_ccb(union ccb * ccb,int priority)828 send_ccb(union ccb *ccb, int priority)
829 {
830 if (debug)
831 warnx("sending ccb (%#x)", ccb->ccb_h.func_code);
832 ccb->ccb_h.pinfo.priority = priority;
833 if (XPT_FC_IS_QUEUED(ccb)) {
834 TAILQ_INSERT_TAIL(&pending_queue, &ccb->ccb_h,
835 periph_links.tqe);
836 }
837 if (write(targ_fd, &ccb, sizeof(ccb)) != sizeof(ccb)) {
838 warn("write ccb");
839 ccb->ccb_h.status = CAM_PROVIDE_FAIL;
840 }
841 }
842
843 /* Return a CTIO/descr/buf combo from the freelist or malloc one */
844 static struct ccb_scsiio *
get_ctio()845 get_ctio()
846 {
847 struct ccb_scsiio *ctio;
848 struct ctio_descr *c_descr;
849 struct sigevent *se;
850
851 if (num_ctios == MAX_CTIOS) {
852 warnx("at CTIO max");
853 return (NULL);
854 }
855
856 ctio = (struct ccb_scsiio *)malloc(sizeof(*ctio));
857 if (ctio == NULL) {
858 warn("malloc CTIO");
859 return (NULL);
860 }
861 c_descr = (struct ctio_descr *)malloc(sizeof(*c_descr));
862 if (c_descr == NULL) {
863 free(ctio);
864 warn("malloc ctio_descr");
865 return (NULL);
866 }
867 c_descr->buf = malloc(buf_size);
868 if (c_descr->buf == NULL) {
869 free(c_descr);
870 free(ctio);
871 warn("malloc backing store");
872 return (NULL);
873 }
874 num_ctios++;
875
876 /* Initialize CTIO, CTIO descr, and AIO */
877 ctio->ccb_h.func_code = XPT_CONT_TARGET_IO;
878 ctio->ccb_h.retry_count = 2;
879 ctio->ccb_h.timeout = CAM_TIME_INFINITY;
880 ctio->data_ptr = c_descr->buf;
881 ctio->ccb_h.targ_descr = c_descr;
882 c_descr->aiocb.aio_buf = c_descr->buf;
883 c_descr->aiocb.aio_fildes = file_fd;
884 se = &c_descr->aiocb.aio_sigevent;
885 se->sigev_notify = SIGEV_KEVENT;
886 se->sigev_notify_kqueue = kq_fd;
887 se->sigev_value.sival_ptr = ctio;
888
889 return (ctio);
890 }
891
892 void
free_ccb(union ccb * ccb)893 free_ccb(union ccb *ccb)
894 {
895 switch (ccb->ccb_h.func_code) {
896 case XPT_CONT_TARGET_IO:
897 {
898 struct ctio_descr *c_descr;
899
900 c_descr = (struct ctio_descr *)ccb->ccb_h.targ_descr;
901 free(c_descr->buf);
902 num_ctios--;
903 /* FALLTHROUGH */
904 }
905 case XPT_ACCEPT_TARGET_IO:
906 free(ccb->ccb_h.targ_descr);
907 /* FALLTHROUGH */
908 case XPT_IMMEDIATE_NOTIFY:
909 default:
910 free(ccb);
911 break;
912 }
913 }
914
915 static cam_status
get_sim_flags(u_int16_t * flags)916 get_sim_flags(u_int16_t *flags)
917 {
918 struct ccb_pathinq cpi;
919 cam_status status;
920
921 /* Find SIM capabilities */
922 bzero(&cpi, sizeof(cpi));
923 cpi.ccb_h.func_code = XPT_PATH_INQ;
924 send_ccb((union ccb *)&cpi, /*priority*/1);
925 status = cpi.ccb_h.status & CAM_STATUS_MASK;
926 if (status != CAM_REQ_CMP) {
927 fprintf(stderr, "CPI failed, status %#x\n", status);
928 return (status);
929 }
930
931 /* Can only enable on controllers that support target mode */
932 if ((cpi.target_sprt & PIT_PROCESSOR) == 0) {
933 fprintf(stderr, "HBA does not support target mode\n");
934 status = CAM_PATH_INVALID;
935 return (status);
936 }
937
938 *flags = cpi.hba_inquiry;
939 return (status);
940 }
941
942 static void
rel_simq()943 rel_simq()
944 {
945 struct ccb_relsim crs;
946
947 bzero(&crs, sizeof(crs));
948 crs.ccb_h.func_code = XPT_REL_SIMQ;
949 crs.release_flags = RELSIM_RELEASE_AFTER_QEMPTY;
950 crs.openings = 0;
951 crs.release_timeout = 0;
952 crs.qfrozen_cnt = 0;
953 send_ccb((union ccb *)&crs, /*priority*/0);
954 }
955
956 /* Cancel all pending CCBs. */
957 static void
abort_all_pending()958 abort_all_pending()
959 {
960 struct ccb_abort cab;
961 struct ccb_hdr *ccb_h;
962
963 if (debug)
964 warnx("abort_all_pending");
965
966 bzero(&cab, sizeof(cab));
967 cab.ccb_h.func_code = XPT_ABORT;
968 TAILQ_FOREACH(ccb_h, &pending_queue, periph_links.tqe) {
969 if (debug)
970 warnx("Aborting pending CCB %p\n", ccb_h);
971 cab.abort_ccb = (union ccb *)ccb_h;
972 send_ccb((union ccb *)&cab, /*priority*/1);
973 if (cab.ccb_h.status != CAM_REQ_CMP) {
974 warnx("Unable to abort CCB, status %#x\n",
975 cab.ccb_h.status);
976 }
977 }
978 }
979
980 static void
usage()981 usage()
982 {
983 fprintf(stderr,
984 "Usage: scsi_target [-AdSTY] [-b bufsize] [-c sectorsize]\n"
985 "\t\t[-r numbufs] [-s volsize] [-W 8,16,32]\n"
986 "\t\tbus:target:lun filename\n");
987 exit(1);
988 }
989