summaryrefslogtreecommitdiffstats
path: root/sys/dev/iscsi_initiator/iscsi.c
blob: 4a1cb967ffa02f373e6dad6edc230c746e3f9799 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
/*-
 * Copyright (c) 2005-2011 Daniel Braniss <danny@cs.huji.ac.il>
 * 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.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 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: iscsi.c 752 2009-08-20 11:23:28Z danny $
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_iscsi_initiator.h"

#include <sys/param.h>
#include <sys/capability.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/ctype.h>
#include <sys/errno.h>
#include <sys/sysctl.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/socketvar.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/proc.h>
#include <sys/ioccom.h>
#include <sys/queue.h>
#include <sys/kthread.h>
#include <sys/mbuf.h>
#include <sys/syslog.h>
#include <vm/uma.h>
#include <sys/sx.h>

#include <dev/iscsi_initiator/iscsi.h>
#include <dev/iscsi_initiator/iscsivar.h>
static char *iscsi_driver_version = "2.3.1";

static struct isc_softc *isc;

MALLOC_DEFINE(M_ISCSI, "iSCSI", "iSCSI driver");
MALLOC_DEFINE(M_ISCSIBUF, "iSCbuf", "iSCSI buffers");
static MALLOC_DEFINE(M_TMP, "iSCtmp", "iSCSI tmp");

#ifdef ISCSI_INITIATOR_DEBUG
int iscsi_debug = ISCSI_INITIATOR_DEBUG;
SYSCTL_INT(_debug, OID_AUTO, iscsi_initiator, CTLFLAG_RW, &iscsi_debug, 0,
	"iSCSI driver debug flag");

struct mtx iscsi_dbg_mtx;
#endif

static int max_sessions = MAX_SESSIONS;
SYSCTL_INT(_net, OID_AUTO, iscsi_initiator_max_sessions, CTLFLAG_RDTUN, &max_sessions, MAX_SESSIONS,
	   "Max sessions allowed");
static int max_pdus = MAX_PDUS;
SYSCTL_INT(_net, OID_AUTO, iscsi_initiator_max_pdus, CTLFLAG_RDTUN, &max_pdus, MAX_PDUS,
	   "Max pdu pool");

static char isid[6+1] = {
     0x80,
     'D',
     'I',
     'B',
     '0',
     '0',
     0
};

static int	i_create_session(struct cdev *dev, int *ndev);

static int	i_ping(struct cdev *dev);
static int	i_send(struct cdev *dev, caddr_t arg, struct thread *td);
static int	i_recv(struct cdev *dev, caddr_t arg, struct thread *td);
static int	i_setsoc(isc_session_t *sp, int fd, struct thread *td);
static int	i_fullfeature(struct cdev *dev, int flag);

static d_open_t iscsi_open;
static d_close_t iscsi_close;
static d_ioctl_t iscsi_ioctl;
#ifdef ISCSI_INITIATOR_DEBUG
static d_read_t iscsi_read;
#endif

static struct cdevsw iscsi_cdevsw = {
     .d_version = D_VERSION,
     .d_open	= iscsi_open,
     .d_close	= iscsi_close,
     .d_ioctl	= iscsi_ioctl,
#ifdef ISCSI_INITIATOR_DEBUG
     .d_read	= iscsi_read,
#endif
     .d_name	= "iSCSI",
};

static int
iscsi_open(struct cdev *dev, int flags, int otype, struct thread *td)
{
     debug_called(8);

     debug(7, "dev=%d", dev2unit(dev));

     if(dev2unit(dev) > max_sessions) {
	  // should not happen
          return ENODEV;
     }
     return 0;
}

static int
iscsi_close(struct cdev *dev, int flag, int otyp, struct thread *td)
{
     isc_session_t	*sp;

     debug_called(8);

     debug(3, "session=%d flag=%x", dev2unit(dev), flag);

     if(dev2unit(dev) == max_sessions) {
	  return 0;
     }
     sp = dev->si_drv2;
     if(sp != NULL) {
	  sdebug(3, "sp->flags=%x", sp->flags );
	  /*
	   | if still in full phase, this probably means
	   | that something went realy bad.
	   | it could be a result from 'shutdown', in which case
	   | we will ignore it (so buffers can be flushed).
	   | the problem is that there is no way of differentiating
	   | between a shutdown procedure and 'iscontrol' dying.
	   */
	  if(sp->flags & ISC_FFPHASE)
	       // delay in case this is a shutdown.
	       tsleep(sp, PRIBIO, "isc-cls", 60*hz);
	  ism_stop(sp);
     }
     debug(2, "done");
     return 0;
}

static int
iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode, struct thread *td)
{
     struct isc_softc	*sc;
     isc_session_t	*sp;
     isc_opt_t		*opt;
     int		error;

     debug_called(8);

     error = 0;
     if(dev2unit(dev) == max_sessions) {
	  /*
	   | non Session commands
	   */
	  sc = dev->si_drv1;
	  if(sc == NULL)
	       return ENXIO;

	  switch(cmd) {
	  case ISCSISETSES:
	       error = i_create_session(dev, (int *)arg);
	       if(error == 0)
		    break;

	  default:
	       error = ENXIO;
	  }
	  return error;
     }
     /*
      | session commands
      */
     sp = dev->si_drv2;
     if(sp == NULL)
	  return ENXIO;

     sdebug(6, "dev=%d cmd=%d", dev2unit(dev), (int)(cmd & 0xff));

     switch(cmd) {
     case ISCSISETSOC:
	  error = i_setsoc(sp, *(u_int *)arg, td);
	  break;

     case ISCSISETOPT:
	  opt = (isc_opt_t *)arg;
	  error = i_setopt(sp, opt);
	  break;

     case ISCSISEND:
	  error = i_send(dev, arg, td);
	  break;

     case ISCSIRECV:
	  error = i_recv(dev, arg, td);
	  break;

     case ISCSIPING:
	  error = i_ping(dev);
	  break;

     case ISCSISTART:
	  error = sp->soc == NULL? ENOTCONN: i_fullfeature(dev, 1);
	  if(error == 0) {
	       sp->proc = td->td_proc;
	       SYSCTL_ADD_INT(&sp->clist, SYSCTL_CHILDREN(sp->oid),
			       OID_AUTO, "pid", CTLFLAG_RD,
			       &sp->proc->p_pid, sizeof(pid_t), "control process id");
	  }
	  break;

     case ISCSIRESTART:
	  error = sp->soc == NULL? ENOTCONN: i_fullfeature(dev, 2);
	  break;

     case ISCSISTOP:
	  error = i_fullfeature(dev, 0);
	  break;
	  
     case ISCSISIGNAL: {
	  int sig = *(int *)arg;

	  if(sig < 0 || sig > _SIG_MAXSIG)
	       error = EINVAL;
	  else
		sp->signal = sig;
	  break;
     }

     case ISCSIGETCAM: {
	  iscsi_cam_t *cp = (iscsi_cam_t *)arg;

	  error = ic_getCamVals(sp, cp);
	  break;
     }

     default:
	  error = ENOIOCTL;
     }

     return error;
}

static int
iscsi_read(struct cdev *dev, struct uio *uio, int ioflag)
{
#ifdef  ISCSI_INITIATOR_DEBUG
     struct isc_softc	*sc;
     isc_session_t	*sp;
     pduq_t 		*pq;
     char		buf[1024];

     sc = dev->si_drv1;
     sp = dev->si_drv2;
     if(dev2unit(dev) == max_sessions) {
	  sprintf(buf, "/----- Session ------/\n");
	  uiomove(buf, strlen(buf), uio);
	  int	i = 0;

	  TAILQ_FOREACH(sp, &sc->isc_sess, sp_link) {
	       if(uio->uio_resid == 0)
		    return 0;
	       sprintf(buf, "%03d] '%s' '%s'\n", i++, sp->opt.targetAddress, sp->opt.targetName);
	       uiomove(buf, strlen(buf), uio);
	  }
	  sprintf(buf, "free npdu_alloc=%d, npdu_max=%d\n", sc->npdu_alloc, sc->npdu_max);
	  uiomove(buf, strlen(buf), uio);
     }
     else {
	  int	i = 0;
	  struct socket	*so = sp->soc;
#define pukeit(i, pq) do {\
	       sprintf(buf, "%03d] %06x %02x %06x %06x %jd\n",\
		       i, ntohl(pq->pdu.ipdu.bhs.CmdSN),\
		       pq->pdu.ipdu.bhs.opcode, ntohl(pq->pdu.ipdu.bhs.itt),\
		       ntohl(pq->pdu.ipdu.bhs.ExpStSN),\
		       (intmax_t)pq->ts.sec);\
	       } while(0)

	  sprintf(buf, "%d/%d /---- hld -----/\n", sp->stats.nhld, sp->stats.max_hld);
	  uiomove(buf, strlen(buf), uio);
	  TAILQ_FOREACH(pq, &sp->hld, pq_link) {
	       if(uio->uio_resid == 0)
		    return 0;
	       pukeit(i, pq); i++;
	       uiomove(buf, strlen(buf), uio);
	  }
	  sprintf(buf, "%d/%d /---- rsp -----/\n", sp->stats.nrsp, sp->stats.max_rsp);
	  uiomove(buf, strlen(buf), uio);
	  i = 0;
	  TAILQ_FOREACH(pq, &sp->rsp, pq_link) {
	       if(uio->uio_resid == 0)
		    return 0;
	       pukeit(i, pq); i++;
	       uiomove(buf, strlen(buf), uio);
	  }
	  sprintf(buf, "%d/%d /---- csnd -----/\n", sp->stats.ncsnd, sp->stats.max_csnd);
	  i = 0;
	  uiomove(buf, strlen(buf), uio);
	  TAILQ_FOREACH(pq, &sp->csnd, pq_link) {
	       if(uio->uio_resid == 0)
		    return 0;
	       pukeit(i, pq); i++;
	       uiomove(buf, strlen(buf), uio);
	  }
	  sprintf(buf, "%d/%d /---- wsnd -----/\n", sp->stats.nwsnd, sp->stats.max_wsnd);
	  i = 0;
	  uiomove(buf, strlen(buf), uio);
	  TAILQ_FOREACH(pq, &sp->wsnd, pq_link) {
	       if(uio->uio_resid == 0)
		    return 0;
	       pukeit(i, pq); i++;
	       uiomove(buf, strlen(buf), uio);
	  }
	  sprintf(buf, "%d/%d /---- isnd -----/\n", sp->stats.nisnd, sp->stats.max_isnd);
	  i = 0;
	  uiomove(buf, strlen(buf), uio);
	  TAILQ_FOREACH(pq, &sp->isnd, pq_link) {
	       if(uio->uio_resid == 0)
		    return 0;
	       pukeit(i, pq); i++;
	       uiomove(buf, strlen(buf), uio);
	  }

	  sprintf(buf, "/---- Stats ---/\n");
	  uiomove(buf, strlen(buf), uio);

	  sprintf(buf, "recv=%d sent=%d\n", sp->stats.nrecv, sp->stats.nsent);
	  uiomove(buf, strlen(buf), uio);

	  sprintf(buf, "flags=%x pdus: alloc=%d max=%d\n", 
		  sp->flags, sc->npdu_alloc, sc->npdu_max);
	  uiomove(buf, strlen(buf), uio);

	  sprintf(buf, "cws=%d last cmd=%x exp=%x max=%x stat=%x itt=%x\n",
		  sp->cws, sp->sn.cmd, sp->sn.expCmd, sp->sn.maxCmd, sp->sn.stat, sp->sn.itt);
	  uiomove(buf, strlen(buf), uio);

	  sprintf(buf, "/---- socket -----/\nso_count=%d so_state=%x\n", so->so_count, so->so_state);
	  uiomove(buf, strlen(buf), uio);

     }
#endif
     return 0;
}

static int
i_ping(struct cdev *dev)
{
     return 0;
}
/*
 | low level I/O
 */
static int
i_setsoc(isc_session_t *sp, int fd, struct thread *td)
{
     cap_rights_t rights;
     int error = 0;

     if(sp->soc != NULL)
	  isc_stop_receiver(sp);

     error = fget(td, fd, cap_rights_init(&rights, CAP_SOCK_CLIENT), &sp->fp);
     if(error)
	  return error;

     error = fgetsock(td, fd, cap_rights_init(&rights, CAP_SOCK_CLIENT),
        &sp->soc, 0);
     if(error == 0) {
	  sp->td = td;
	  isc_start_receiver(sp);
     }
     else {
	  fdrop(sp->fp, td);
	  sp->fp = NULL;
     }

     return error;
}

static int
i_send(struct cdev *dev, caddr_t arg, struct thread *td)
{
     isc_session_t	*sp = dev->si_drv2;
     caddr_t		bp;
     pduq_t		*pq;
     pdu_t		*pp;
     int		n, error;

     debug_called(8);

     if(sp->soc == NULL)
	  return ENOTCONN;

     if((pq = pdu_alloc(sp->isc, M_NOWAIT)) == NULL)
	  return EAGAIN;
     pp = &pq->pdu;
     pq->pdu = *(pdu_t *)arg;
     if((error = i_prepPDU(sp, pq)) != 0)
	  goto out;

     bp = NULL;
     if((pq->len - sizeof(union ipdu_u)) > 0) {
	  pq->buf = bp = malloc(pq->len - sizeof(union ipdu_u), M_ISCSIBUF, M_NOWAIT);
	  if(pq->buf == NULL) {
	       error = EAGAIN;
	       goto out;
	  }
     }
     else
	  pq->buf = NULL; // just in case?

     sdebug(2, "len=%d ahs_len=%d ds_len=%d buf=%zu@%p",
	    pq->len, pp->ahs_len, pp->ds_len, pq->len - sizeof(union ipdu_u), bp);

     if(pp->ahs_len) {
	  // XXX: never tested, looks suspicious
	  n = pp->ahs_len;
	  error = copyin(pp->ahs_addr, bp, n);
	  if(error != 0) {
	       sdebug(3, "copyin ahs: error=%d", error);
	       goto out;
	  }
	  pp->ahs_addr = (ahs_t *)bp;
	  bp += n;
     }
     if(pp->ds_len) {
	  n = pp->ds_len;
	  error = copyin(pp->ds_addr, bp, n);
	  if(error != 0) {
	       sdebug(3, "copyin ds: error=%d", error);
	       goto out;
	  }
	  pp->ds_addr = bp;
	  bp += n;
	  while(n & 03) {
	       n++;
	       *bp++ = 0;
	  }
     }

     error = isc_qout(sp, pq);
     if(error == 0)
	  wakeup(&sp->flags); // XXX: to 'push' proc_out ...
out:
     if(error)
	  pdu_free(sp->isc, pq);

     return error;
}

static int
i_recv(struct cdev *dev, caddr_t arg, struct thread *td)
{
     isc_session_t	*sp = dev->si_drv2;
     pduq_t		*pq;
     pdu_t		*pp, *up;
     caddr_t		bp;
     int		error, mustfree, cnt;
     size_t		need, have, n;

     debug_called(8);

     if(sp == NULL)
	  return EIO;

     if(sp->soc == NULL)
	  return ENOTCONN;
     cnt = 6;     // XXX: maybe the user can request a time out?
     mtx_lock(&sp->rsp_mtx);
     while((pq = TAILQ_FIRST(&sp->rsp)) == NULL) {
	  msleep(&sp->rsp, &sp->rsp_mtx, PRIBIO, "isc_rsp", hz*10);
	  if(cnt-- == 0) break; // XXX: for now, needs work
     }
     if(pq != NULL) {
	  sp->stats.nrsp--;
	  TAILQ_REMOVE(&sp->rsp, pq, pq_link);
     }
     mtx_unlock(&sp->rsp_mtx);

     sdebug(6, "cnt=%d", cnt);

     if(pq == NULL) {
	  error = ENOTCONN;
	  sdebug(3, "error=%d sp->flags=%x ", error, sp->flags);
	  return error;
     }
     up = (pdu_t *)arg;
     pp = &pq->pdu;
     up->ipdu = pp->ipdu;
     n = 0;
     up->ds_len = 0;
     up->ahs_len = 0;
     error = 0;

     if(pq->mp) {
	  u_int	len;

	  // Grr...
	  len = 0;
	  if(pp->ahs_len) {
	       len += pp->ahs_len;
	  }
	  if(pp->ds_len) {
	       len += pp->ds_len;
	  }

	  mustfree = 0;
	  if(len > pq->mp->m_len) {
	       mustfree++;
	       bp = malloc(len, M_TMP, M_WAITOK);
	       sdebug(4, "need mbufcopy: %d", len);
	       i_mbufcopy(pq->mp, bp, len);
	  } 
	  else
	       bp = mtod(pq->mp, caddr_t);

	  if(pp->ahs_len) {
	       need = pp->ahs_len;
	       n = MIN(up->ahs_size, need);
	       error = copyout(bp, (caddr_t)up->ahs_addr, n);
	       up->ahs_len = n;
	       bp += need;
	  }
	  if(!error && pp->ds_len) {
	       need = pp->ds_len;
	       if((have = up->ds_size) == 0) {
		    have = up->ahs_size - n;
		    up->ds_addr = (caddr_t)up->ahs_addr + n;
	       }
	       n = MIN(have, need);
	       error = copyout(bp, (caddr_t)up->ds_addr, n);
	       up->ds_len = n;
	  }

	  if(mustfree)
	       free(bp, M_TMP);
     }

     sdebug(6, "len=%d ahs_len=%d ds_len=%d", pq->len, pp->ahs_len, pp->ds_len);

     pdu_free(sp->isc, pq);

     return error;
}

static int
i_fullfeature(struct cdev *dev, int flag)
{
     isc_session_t	*sp = dev->si_drv2;
     int		error;

     sdebug(2, "flag=%d", flag);

     error = 0;
     switch(flag) {
     case 0: // stop
         sp->flags &= ~ISC_FFPHASE;
         break;
     case 1: // start
         sp->flags |= ISC_FFPHASE;
         error = ic_init(sp);
         break;
     case 2: // restart
         sp->flags |= ISC_FFPHASE;
         ism_restart(sp);
         break;
     }
     return error;
}

static int
i_create_session(struct cdev *dev, int *ndev)
{ 
     struct isc_softc	*sc = dev->si_drv1;
     isc_session_t	*sp;
     int		error, n;

     debug_called(8);

     sp = malloc(sizeof(isc_session_t), M_ISCSI, M_WAITOK | M_ZERO);
     if(sp == NULL)
	  return ENOMEM;

     sx_xlock(&sc->unit_sx);
     if((n = alloc_unr(sc->unit)) < 0) {
	  sx_unlock(&sc->unit_sx);
	  free(sp, M_ISCSI);
	  xdebug("too many sessions!");
	  return EPERM;
     }
     sx_unlock(&sc->unit_sx);

     mtx_lock(&sc->isc_mtx);
     TAILQ_INSERT_TAIL(&sc->isc_sess, sp, sp_link);
     isc->nsess++;
     mtx_unlock(&sc->isc_mtx);

     sp->dev = make_dev(&iscsi_cdevsw, n, UID_ROOT, GID_WHEEL, 0600, "iscsi%d", n);
     *ndev = sp->sid = n;
     sp->isc = sc;
     sp->dev->si_drv1 = sc;
     sp->dev->si_drv2 = sp;

     sp->opt.maxRecvDataSegmentLength = 8192;
     sp->opt.maxXmitDataSegmentLength = 8192;
     sp->opt.maxBurstLength = 65536;	// 64k
     sp->opt.maxluns = ISCSI_MAX_LUNS;

     error = ism_start(sp);

     return error;
}

#ifdef notused
static void
iscsi_counters(isc_session_t *sp)
{
     int	h, r, s;
     pduq_t	*pq;

#define _puke(i, pq) do {\
	       debug(2, "%03d] %06x %02x %x %ld %jd %x\n",\
		       i, ntohl( pq->pdu.ipdu.bhs.CmdSN), \
		       pq->pdu.ipdu.bhs.opcode, ntohl(pq->pdu.ipdu.bhs.itt),\
		       (long)pq->ts.sec, pq->ts.frac, pq->flags);\
	       } while(0)

     h = r = s = 0; 
     TAILQ_FOREACH(pq, &sp->hld, pq_link) {
	  _puke(h, pq);
	  h++;
     }
     TAILQ_FOREACH(pq, &sp->rsp, pq_link) r++;
     TAILQ_FOREACH(pq, &sp->csnd, pq_link) s++;
     TAILQ_FOREACH(pq, &sp->wsnd, pq_link) s++;
     TAILQ_FOREACH(pq, &sp->isnd, pq_link) s++;
     debug(2, "hld=%d rsp=%d snd=%d", h, r, s);
}
#endif

static void
iscsi_shutdown(void *v)
{
     struct isc_softc	*sc = v;
     isc_session_t	*sp;
     int	n;

     debug_called(8);
     if(sc == NULL) {
	  xdebug("sc is NULL!");
	  return;
     }
#ifdef DO_EVENTHANDLER
     if(sc->eh == NULL)
	  debug(2, "sc->eh is NULL");
     else {
	  EVENTHANDLER_DEREGISTER(shutdown_pre_sync, sc->eh);
	  debug(2, "done n=%d", sc->nsess);
     }
#endif
     n = 0;
     TAILQ_FOREACH(sp, &sc->isc_sess, sp_link) {
	  debug(2, "%2d] sp->flags=0x%08x", n, sp->flags);
	  n++;
     }
     debug(2, "done");
}

static void
free_pdus(struct isc_softc *sc)
{
     debug_called(8);

     if(sc->pdu_zone != NULL) {
	  uma_zdestroy(sc->pdu_zone);
	  sc->pdu_zone = NULL;
     }
}

static void
iscsi_start(void)
{
     debug_called(8);

     TUNABLE_INT_FETCH("net.iscsi_initiator.max_sessions", &max_sessions);
     TUNABLE_INT_FETCH("net.iscsi_initiator.max_pdus", &max_pdus);

     isc =  malloc(sizeof(struct isc_softc), M_ISCSI, M_ZERO|M_WAITOK);
     isc->dev = make_dev(&iscsi_cdevsw, max_sessions, UID_ROOT, GID_WHEEL, 0600, "iscsi");
     isc->dev->si_drv1 = isc;
     mtx_init(&isc->isc_mtx, "iscsi", NULL, MTX_DEF);

     TAILQ_INIT(&isc->isc_sess);
     /*
      | now init the free pdu list
      */
     isc->pdu_zone = uma_zcreate("pdu", sizeof(pduq_t),
				 NULL, NULL, NULL, NULL,
				 0, 0);
     if(isc->pdu_zone == NULL) {
	  xdebug("iscsi_initiator: uma_zcreate failed");
	  // XXX: should fail...
     }
     uma_zone_set_max(isc->pdu_zone, max_pdus);
     isc->unit = new_unrhdr(0, max_sessions-1, NULL);
     sx_init(&isc->unit_sx, "iscsi sx");

#ifdef DO_EVENTHANDLER
     if((isc->eh = EVENTHANDLER_REGISTER(shutdown_pre_sync, iscsi_shutdown,
					sc, SHUTDOWN_PRI_DEFAULT-1)) == NULL)
	  xdebug("shutdown event registration failed\n");
#endif
     /*
      | sysctl stuff
      */
     sysctl_ctx_init(&isc->clist);
     isc->oid = SYSCTL_ADD_NODE(&isc->clist,
			       SYSCTL_STATIC_CHILDREN(_net),
			       OID_AUTO,
			       "iscsi_initiator",
			       CTLFLAG_RD,
			       0,
			       "iSCSI Subsystem");

     SYSCTL_ADD_STRING(&isc->clist,
		       SYSCTL_CHILDREN(isc->oid),
		       OID_AUTO,
		       "driver_version",
		       CTLFLAG_RD,
		       iscsi_driver_version,
		       0,
		       "iscsi driver version");
 
     SYSCTL_ADD_STRING(&isc->clist,
		       SYSCTL_CHILDREN(isc->oid),
		       OID_AUTO,
		       "isid",
		       CTLFLAG_RW,
		       isid,
		       6+1,
		       "initiator part of the Session Identifier");

     SYSCTL_ADD_INT(&isc->clist,
		    SYSCTL_CHILDREN(isc->oid),
		    OID_AUTO,
		    "sessions",
		    CTLFLAG_RD,
		    &isc->nsess,
		    sizeof(isc->nsess),
		    "number of active session");

#ifdef ISCSI_INITIATOR_DEBUG
     mtx_init(&iscsi_dbg_mtx, "iscsi_dbg", NULL, MTX_DEF);
#endif

     printf("iscsi: version %s\n", iscsi_driver_version);
}

/*
 | Notes:
 |	unload SHOULD fail if there is activity
 |	activity: there is/are active session/s
 */
static void
iscsi_stop(void)
{
     isc_session_t	*sp, *sp_tmp;

     debug_called(8);

     /*
      | go through all the sessions
      | Note: close should have done this ...
      */
     TAILQ_FOREACH_SAFE(sp, &isc->isc_sess, sp_link, sp_tmp) {
	  //XXX: check for activity ...
	  ism_stop(sp);
	  if(sp->cam_sim != NULL)
	       ic_destroy(sp);
     }
     mtx_destroy(&isc->isc_mtx);
     sx_destroy(&isc->unit_sx);

     free_pdus(isc);

     if(isc->dev)
	  destroy_dev(isc->dev);

     if(sysctl_ctx_free(&isc->clist))
	  xdebug("sysctl_ctx_free failed");

     iscsi_shutdown(isc); // XXX: check EVENTHANDLER_ ...

#ifdef ISCSI_INITIATOR_DEBUG
     mtx_destroy(&iscsi_dbg_mtx);
#endif

     free(isc, M_ISCSI);
}

static int
iscsi_modevent(module_t mod, int what, void *arg)
{
     debug_called(8);

     switch(what) {
     case MOD_LOAD:
	  iscsi_start();
	  break;

     case MOD_QUIESCE:
	  if(isc->nsess) {
	       xdebug("iscsi module busy(nsess=%d), cannot unload", isc->nsess);
	       log(LOG_ERR, "iscsi module busy, cannot unload");
	  }
	  return isc->nsess;

     case MOD_SHUTDOWN:
	  break;

     case MOD_UNLOAD:
	  iscsi_stop();
	  break;

     default:
	  break;
     }
     return 0;
}

moduledata_t iscsi_mod = {
         "iscsi",
         (modeventhand_t) iscsi_modevent,
         0
};

#ifdef ISCSI_ROOT
static void
iscsi_rootconf(void)
{
#if 0
	nfs_setup_diskless();
	if (nfs_diskless_valid)
		rootdevnames[0] = "nfs:";
#endif
	printf("** iscsi_rootconf **\n");
}

SYSINIT(cpu_rootconf1, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, iscsi_rootconf, NULL)
#endif

DECLARE_MODULE(iscsi, iscsi_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
MODULE_DEPEND(iscsi, cam, 1, 1, 1);
OpenPOWER on IntegriCloud