share/examples/scsi_target/scsi_target.c

   1 /*
   2  * SCSI Disk Emulator
   3  *
   4  * Copyright (c) 2002 Nate Lawson.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification, immediately at the beginning of the file.
  13  * 2. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD$
  29  */
  30
  31 #include <sys/types.h>
  32 #include <ctype.h>
  33 #include <errno.h>
  34 #include <err.h>
  35 #include <fcntl.h>
  36 #include <signal.h>
  37 #include <stddef.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <sysexits.h>
  42 #include <unistd.h>
  43 #include <aio.h>
  44 #include <assert.h>
  45 #include <sys/stat.h>
  46 #include <sys/queue.h>
  47 #include <sys/event.h>
  48 #include <sys/param.h>
  49 #include <sys/disk.h>
  50 #include <cam/cam_queue.h>
  51 #include <cam/scsi/scsi_all.h>
  52 #include <cam/scsi/scsi_targetio.h>
  53 #include <cam/scsi/scsi_message.h>
  54 #include "scsi_target.h"
  55
  56 /* Maximum amount to transfer per CTIO */
  57 #define MAX_XFER        MAXPHYS
  58 /* Maximum number of allocated CTIOs */
  59 #define MAX_CTIOS       64
  60 /* Maximum sector size for emulated volume */
  61 #define MAX_SECTOR      32768
  62
  63 /* Global variables */
  64 int             debug;
  65 int             notaio = 0;
  66 off_t           volume_size;
  67 u_int           sector_size;
  68 size_t          buf_size;
  69
  70 /* Local variables */
  71 static int    targ_fd;
  72 static int    kq_fd;
  73 static int    file_fd;
  74 static int    num_ctios;
  75 static struct ccb_queue         pending_queue;
  76 static struct ccb_queue         work_queue;
  77 static struct ioc_enable_lun    ioc_enlun = {
  78         CAM_BUS_WILDCARD,
  79         CAM_TARGET_WILDCARD,
  80         CAM_LUN_WILDCARD
  81 };
  82
  83 /* Local functions */
  84 static void             cleanup(void);
  85 static int              init_ccbs(void);
  86 static void             request_loop(void);
  87 static void             handle_read(void);
  88 /* static int           work_atio(struct ccb_accept_tio *); */
  89 static void             queue_io(struct ccb_scsiio *);
  90 static int              run_queue(struct ccb_accept_tio *);
  91 static int              work_inot(struct ccb_immed_notify *);
  92 static struct ccb_scsiio *
  93                         get_ctio(void);
  94 /* static void          free_ccb(union ccb *); */
  95 static cam_status       get_sim_flags(u_int16_t *);
  96 static void             rel_simq(void);
  97 static void             abort_all_pending(void);
  98 static void             usage(void);
  99
 100 int
 101 main(int argc, char *argv[])
 102 {
 103         int ch, unit;
 104         char *file_name, targname[16];
 105         u_int16_t req_flags, sim_flags;
 106         off_t user_size;
 107
 108         /* Initialize */
 109         debug = 0;
 110         req_flags = sim_flags = 0;
 111         user_size = 0;
 112         targ_fd = file_fd = kq_fd = -1;
 113         num_ctios = 0;
 114         sector_size = SECTOR_SIZE;
 115         buf_size = DFLTPHYS;
 116
 117         /* Prepare resource pools */
 118         TAILQ_INIT(&pending_queue);
 119         TAILQ_INIT(&work_queue);
 120
 121         while ((ch = getopt(argc, argv, "AdSTYb:c:s:W:")) != -1) {
 122                 switch(ch) {
 123                 case 'A':
 124                         req_flags |= SID_Addr16;
 125                         break;
 126                 case 'd':
 127                         debug = 1;
 128                         break;
 129                 case 'S':
 130                         req_flags |= SID_Sync;
 131                         break;
 132                 case 'T':
 133                         req_flags |= SID_CmdQue;
 134                         break;
 135                 case 'b':
 136                         buf_size = atoi(optarg);
 137                         if (buf_size < 256 || buf_size > MAX_XFER)
 138                                 errx(1, "Unreasonable buf size: %s", optarg);
 139                         break;
 140                 case 'c':
 141                         sector_size = atoi(optarg);
 142                         if (sector_size < 512 || sector_size > MAX_SECTOR)
 143                                 errx(1, "Unreasonable sector size: %s", optarg);
 144                         break;
 145                 case 's':
 146                 {
 147                         int last, shift = 0;
 148
 149                         last = strlen(optarg) - 1;
 150                         if (last > 0) {
 151                                 switch (tolower(optarg[last])) {
 152                                 case 'e':
 153                                         shift += 10;
 154                                         /* FALLTHROUGH */
 155                                 case 'p':
 156                                         shift += 10;
 157                                         /* FALLTHROUGH */
 158                                 case 't':
 159                                         shift += 10;
 160                                         /* FALLTHROUGH */
 161                                 case 'g':
 162                                         shift += 10;
 163                                         /* FALLTHROUGH */
 164                                 case 'm':
 165                                         shift += 10;
 166                                         /* FALLTHROUGH */
 167                                 case 'k':
 168                                         shift += 10;
 169                                         optarg[last] = 0;
 170                                         break;
 171                                 }
 172                         }
 173                         user_size = strtoll(optarg, (char **)NULL, /*base*/10);
 174                         user_size <<= shift;
 175                         if (user_size < 0)
 176                                 errx(1, "Unreasonable volume size: %s", optarg);
 177                         break;
 178                 }
 179                 case 'W':
 180                         req_flags &= ~(SID_WBus16 | SID_WBus32);
 181                         switch (atoi(optarg)) {
 182                         case 8:
 183                                 /* Leave req_flags zeroed */
 184                                 break;
 185                         case 16:
 186                                 req_flags |= SID_WBus16;
 187                                 break;
 188                         case 32:
 189                                 req_flags |= SID_WBus32;
 190                                 break;
 191                         default:
 192                                 warnx("Width %s not supported", optarg);
 193                                 usage();
 194                                 /* NOTREACHED */
 195                         }
 196                         break;
 197                 case 'Y':
 198                         notaio = 1;
 199                         break;
 200                 default:
 201                         usage();
 202                         /* NOTREACHED */
 203                 }
 204         }
 205         argc -= optind;
 206         argv += optind;
 207
 208         if (argc != 2)
 209                 usage();
 210
 211         sscanf(argv[0], "%u:%u:%u", &ioc_enlun.path_id, &ioc_enlun.target_id,
 212                &ioc_enlun.lun_id);
 213         file_name = argv[1];
 214
 215         if (ioc_enlun.path_id == CAM_BUS_WILDCARD ||
 216             ioc_enlun.target_id == CAM_TARGET_WILDCARD ||
 217             ioc_enlun.lun_id == CAM_LUN_WILDCARD) {
 218                 warnx("Incomplete target path specified");
 219                 usage();
 220                 /* NOTREACHED */
 221         }
 222         /* We don't support any vendor-specific commands */
 223         ioc_enlun.grp6_len = 0;
 224         ioc_enlun.grp7_len = 0;
 225
 226         /* Open backing store for IO */
 227         file_fd = open(file_name, O_RDWR);
 228         if (file_fd < 0)
 229                 err(1, "open backing store file");
 230
 231         /* Check backing store size or use the size user gave us */
 232         if (user_size == 0) {
 233                 struct stat st;
 234
 235                 if (fstat(file_fd, &st) < 0)
 236                         err(1, "fstat file");
 237 #if __FreeBSD_version >= 500000
 238                 if ((st.st_mode & S_IFCHR) != 0) {
 239                         /* raw device */
 240                         off_t mediasize;
 241                         if (ioctl(file_fd, DIOCGMEDIASIZE, &mediasize) < 0)
 242                                 err(1, "DIOCGMEDIASIZE");
 243
 244                         /* XXX get sector size by ioctl()?? */
 245                         volume_size = mediasize / sector_size;
 246                 } else
 247 #endif
 248                         volume_size = st.st_size / sector_size;
 249         } else {
 250                 volume_size = user_size / sector_size;
 251         }
 252         if (debug)
 253                 warnx("volume_size: %d bytes x " OFF_FMT " sectors",
 254                     sector_size, volume_size);
 255
 256         if (volume_size <= 0)
 257                 errx(1, "volume must be larger than %d", sector_size);
 258
 259         if (notaio == 0) {
 260                 struct aiocb aio, *aiop;
 261
 262                 /* See if we have we have working AIO support */
 263                 memset(&aio, 0, sizeof(aio));
 264                 aio.aio_buf = malloc(sector_size);
 265                 if (aio.aio_buf == NULL)
 266                         err(1, "malloc");
 267                 aio.aio_fildes = file_fd;
 268                 aio.aio_offset = 0;
 269                 aio.aio_nbytes = sector_size;
 270                 signal(SIGSYS, SIG_IGN);
 271                 if (aio_read(&aio) != 0) {
 272                         printf("AIO support is not available- switchin to"
 273                                " single-threaded mode.\n");
 274                         notaio = 1;
 275                 } else {
 276                         if (aio_waitcomplete(&aiop, NULL) != sector_size)
 277                                 err(1, "aio_waitcomplete");
 278                         assert(aiop == &aio);
 279                         signal(SIGSYS, SIG_DFL);
 280                 }
 281                 free((void *)aio.aio_buf);
 282                 if (debug && notaio == 0)
 283                         warnx("aio support tested ok");
 284         }
 285
 286         /* Go through all the control devices and find one that isn't busy. */
 287         unit = 0;
 288         do {
 289                 snprintf(targname, sizeof(targname), "/dev/targ%d", unit++);
 290                 targ_fd = open(targname, O_RDWR);
 291         } while (targ_fd < 0 && errno == EBUSY);
 292
 293         if (targ_fd < 0)
 294             err(1, "Tried to open %d devices, none available", unit);
 295
 296         /* The first three are handled by kevent() later */
 297         signal(SIGHUP, SIG_IGN);
 298         signal(SIGINT, SIG_IGN);
 299         signal(SIGTERM, SIG_IGN);
 300         signal(SIGPROF, SIG_IGN);
 301         signal(SIGALRM, SIG_IGN);
 302         signal(SIGSTOP, SIG_IGN);
 303         signal(SIGTSTP, SIG_IGN);
 304
 305         /* Register a cleanup handler to run when exiting */
 306         atexit(cleanup);
 307
 308         /* Enable listening on the specified LUN */
 309         if (ioctl(targ_fd, TARGIOCENABLE, &ioc_enlun) != 0)
 310                 err(1, "TARGIOCENABLE");
 311
 312         /* Enable debugging if requested */
 313         if (debug) {
 314                 if (ioctl(targ_fd, TARGIOCDEBUG, &debug) != 0)
 315                         warnx("TARGIOCDEBUG");
 316         }
 317
 318         /* Set up inquiry data according to what SIM supports */
 319         if (get_sim_flags(&sim_flags) != CAM_REQ_CMP)
 320                 errx(1, "get_sim_flags");
 321         if (tcmd_init(req_flags, sim_flags) != 0)
 322                 errx(1, "Initializing tcmd subsystem failed");
 323
 324         /* Queue ATIOs and INOTs on descriptor */
 325         if (init_ccbs() != 0)
 326                 errx(1, "init_ccbs failed");
 327
 328         if (debug)
 329                 warnx("main loop beginning");
 330         request_loop();
 331
 332         exit(0);
 333 }
 334
 335 static void
 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
 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_immed_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_immed_notify *)malloc(sizeof(*inot));
 388                 if (inot == NULL) {
 389                         warn("malloc INOT");
 390                         return (-1);
 391                 }
 392                 inot->ccb_h.func_code = XPT_IMMED_NOTIFY;
 393                 send_ccb((union ccb *)inot, /*priority*/1);
 394         }
 395
 396         return (0);
 397 }
 398
 399 static void
 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_IMMED_NOTIFY:
 501                                 retval = work_inot(&ccb->cin);
 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
 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_IMMED_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
 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 *sense;
 651
 652                 if (debug) {
 653                         warnx("ATIO with %u bytes sense received",
 654                               atio->sense_len);
 655                 }
 656                 sense = &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
 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
 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
 777 work_inot(struct ccb_immed_notify *inot)
 778 {
 779         cam_status status;
 780         int sense;
 781
 782         if (debug)
 783                 warnx("Working on INOT %p", inot);
 784
 785         status = inot->ccb_h.status;
 786         sense = (status & CAM_AUTOSNS_VALID) != 0;
 787         status &= CAM_STATUS_MASK;
 788
 789         switch (status) {
 790         case CAM_SCSI_BUS_RESET:
 791                 tcmd_ua(CAM_TARGET_WILDCARD, UA_BUS_RESET);
 792                 abort_all_pending();
 793                 break;
 794         case CAM_BDR_SENT:
 795                 tcmd_ua(CAM_TARGET_WILDCARD, UA_BDR);
 796                 abort_all_pending();
 797                 break;
 798         case CAM_MESSAGE_RECV:
 799                 switch (inot->message_args[0]) {
 800                 case MSG_TASK_COMPLETE:
 801                 case MSG_INITIATOR_DET_ERR:
 802                 case MSG_ABORT_TASK_SET:
 803                 case MSG_MESSAGE_REJECT:
 804                 case MSG_NOOP:
 805                 case MSG_PARITY_ERROR:
 806                 case MSG_TARGET_RESET:
 807                 case MSG_ABORT_TASK:
 808                 case MSG_CLEAR_TASK_SET:
 809                 default:
 810                         warnx("INOT message %#x", inot->message_args[0]);
 811                         break;
 812                 }
 813                 break;
 814         case CAM_REQ_ABORTED:
 815                 warnx("INOT %p aborted", inot);
 816                 break;
 817         default:
 818                 warnx("Unhandled INOT status %#x", status);
 819                 break;
 820         }
 821
 822         /* If there is sense data, use it */
 823         if (sense != 0) {
 824                 struct scsi_sense_data *sense;
 825
 826                 sense = &inot->sense_data;
 827                 tcmd_sense(inot->initiator_id, NULL, sense->flags,
 828                            sense->add_sense_code, sense->add_sense_code_qual);
 829                 if (debug)
 830                         warnx("INOT has sense: %#x", sense->flags);
 831         }
 832
 833         /* Requeue on SIM */
 834         TAILQ_REMOVE(&work_queue, &inot->ccb_h, periph_links.tqe);
 835         send_ccb((union ccb *)inot, /*priority*/1);
 836
 837         return (1);
 838 }
 839
 840 void
 841 send_ccb(union ccb *ccb, int priority)
 842 {
 843         if (debug)
 844                 warnx("sending ccb (%#x)", ccb->ccb_h.func_code);
 845         ccb->ccb_h.pinfo.priority = priority;
 846         if (XPT_FC_IS_QUEUED(ccb)) {
 847                 TAILQ_INSERT_TAIL(&pending_queue, &ccb->ccb_h,
 848                                   periph_links.tqe);
 849         }
 850         if (write(targ_fd, &ccb, sizeof(ccb)) != sizeof(ccb)) {
 851                 warn("write ccb");
 852                 ccb->ccb_h.status = CAM_PROVIDE_FAIL;
 853         }
 854 }
 855
 856 /* Return a CTIO/descr/buf combo from the freelist or malloc one */
 857 static struct ccb_scsiio *
 858 get_ctio()
 859 {
 860         struct ccb_scsiio *ctio;
 861         struct ctio_descr *c_descr;
 862         struct sigevent *se;
 863
 864         if (num_ctios == MAX_CTIOS) {
 865                 warnx("at CTIO max");
 866                 return (NULL);
 867         }
 868
 869         ctio = (struct ccb_scsiio *)malloc(sizeof(*ctio));
 870         if (ctio == NULL) {
 871                 warn("malloc CTIO");
 872                 return (NULL);
 873         }
 874         c_descr = (struct ctio_descr *)malloc(sizeof(*c_descr));
 875         if (c_descr == NULL) {
 876                 free(ctio);
 877                 warn("malloc ctio_descr");
 878                 return (NULL);
 879         }
 880         c_descr->buf = malloc(buf_size);
 881         if (c_descr->buf == NULL) {
 882                 free(c_descr);
 883                 free(ctio);
 884                 warn("malloc backing store");
 885                 return (NULL);
 886         }
 887         num_ctios++;
 888
 889         /* Initialize CTIO, CTIO descr, and AIO */
 890         ctio->ccb_h.func_code = XPT_CONT_TARGET_IO;
 891         ctio->ccb_h.retry_count = 2;
 892         ctio->ccb_h.timeout = CAM_TIME_INFINITY;
 893         ctio->data_ptr = c_descr->buf;
 894         ctio->ccb_h.targ_descr = c_descr;
 895         c_descr->aiocb.aio_buf = c_descr->buf;
 896         c_descr->aiocb.aio_fildes = file_fd;
 897         se = &c_descr->aiocb.aio_sigevent;
 898         se->sigev_notify = SIGEV_KEVENT;
 899         se->sigev_notify_kqueue = kq_fd;
 900         se->sigev_value.sival_ptr = ctio;
 901
 902         return (ctio);
 903 }
 904
 905 void
 906 free_ccb(union ccb *ccb)
 907 {
 908         switch (ccb->ccb_h.func_code) {
 909         case XPT_CONT_TARGET_IO:
 910         {
 911                 struct ctio_descr *c_descr;
 912
 913                 c_descr = (struct ctio_descr *)ccb->ccb_h.targ_descr;
 914                 free(c_descr->buf);
 915                 num_ctios--;
 916                 /* FALLTHROUGH */
 917         }
 918         case XPT_ACCEPT_TARGET_IO:
 919                 free(ccb->ccb_h.targ_descr);
 920                 /* FALLTHROUGH */
 921         case XPT_IMMED_NOTIFY:
 922         default:
 923                 free(ccb);
 924                 break;
 925         }
 926 }
 927
 928 static cam_status
 929 get_sim_flags(u_int16_t *flags)
 930 {
 931         struct ccb_pathinq cpi;
 932         cam_status status;
 933
 934         /* Find SIM capabilities */
 935         bzero(&cpi, sizeof(cpi));
 936         cpi.ccb_h.func_code = XPT_PATH_INQ;
 937         send_ccb((union ccb *)&cpi, /*priority*/1);
 938         status = cpi.ccb_h.status & CAM_STATUS_MASK;
 939         if (status != CAM_REQ_CMP) {
 940                 fprintf(stderr, "CPI failed, status %#x\n", status);
 941                 return (status);
 942         }
 943
 944         /* Can only enable on controllers that support target mode */
 945         if ((cpi.target_sprt & PIT_PROCESSOR) == 0) {
 946                 fprintf(stderr, "HBA does not support target mode\n");
 947                 status = CAM_PATH_INVALID;
 948                 return (status);
 949         }
 950
 951         *flags = cpi.hba_inquiry;
 952         return (status);
 953 }
 954
 955 static void
 956 rel_simq()
 957 {
 958         struct ccb_relsim crs;
 959
 960         bzero(&crs, sizeof(crs));
 961         crs.ccb_h.func_code = XPT_REL_SIMQ;
 962         crs.release_flags = RELSIM_RELEASE_AFTER_QEMPTY;
 963         crs.openings = 0;
 964         crs.release_timeout = 0;
 965         crs.qfrozen_cnt = 0;
 966         send_ccb((union ccb *)&crs, /*priority*/0);
 967 }
 968
 969 /* Cancel all pending CCBs. */
 970 static void
 971 abort_all_pending()
 972 {
 973         struct ccb_abort         cab;
 974         struct ccb_hdr          *ccb_h;
 975
 976         if (debug)
 977                   warnx("abort_all_pending");
 978
 979         bzero(&cab, sizeof(cab));
 980         cab.ccb_h.func_code = XPT_ABORT;
 981         TAILQ_FOREACH(ccb_h, &pending_queue, periph_links.tqe) {
 982                 if (debug)
 983                           warnx("Aborting pending CCB %p\n", ccb_h);
 984                 cab.abort_ccb = (union ccb *)ccb_h;
 985                 send_ccb((union ccb *)&cab, /*priority*/1);
 986                 if (cab.ccb_h.status != CAM_REQ_CMP) {
 987                         warnx("Unable to abort CCB, status %#x\n",
 988                                cab.ccb_h.status);
 989                 }
 990         }
 991 }
 992
 993 static void
 994 usage()
 995 {
 996         fprintf(stderr,
 997                 "Usage: scsi_target [-AdSTY] [-b bufsize] [-c sectorsize]\n"
 998                 "\t\t[-r numbufs] [-s volsize] [-W 8,16,32]\n"
 999                 "\t\tbus:target:lun filename\n");
1000         exit(1);
1001 }