1 /*-
2 * Copyright (c) 2005-2011 Daniel Braniss <danny@cs.huji.ac.il>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27 /*
28 | $Id: iscsi.c 752 2009-08-20 11:23:28Z danny $
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include "opt_iscsi_initiator.h"
35
36 #include <sys/param.h>
37 #include <sys/capsicum.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
40 #include <sys/conf.h>
41 #include <sys/bus.h>
42 #include <sys/systm.h>
43 #include <sys/malloc.h>
44 #include <sys/ctype.h>
45 #include <sys/errno.h>
46 #include <sys/sysctl.h>
47 #include <sys/file.h>
48 #include <sys/uio.h>
49 #include <sys/socketvar.h>
50 #include <sys/socket.h>
51 #include <sys/protosw.h>
52 #include <sys/proc.h>
53 #include <sys/ioccom.h>
54 #include <sys/queue.h>
55 #include <sys/kthread.h>
56 #include <sys/mbuf.h>
57 #include <sys/syslog.h>
58 #include <vm/uma.h>
59 #include <sys/sx.h>
60
61 #include <dev/iscsi_initiator/iscsi.h>
62 #include <dev/iscsi_initiator/iscsivar.h>
63 static char *iscsi_driver_version = "2.3.1";
64
65 static struct isc_softc *isc;
66
67 MALLOC_DEFINE(M_ISCSI, "iSCSI", "iSCSI driver");
68 MALLOC_DEFINE(M_ISCSIBUF, "iSCbuf", "iSCSI buffers");
69 static MALLOC_DEFINE(M_TMP, "iSCtmp", "iSCSI tmp");
70
71 #ifdef ISCSI_INITIATOR_DEBUG
72 int iscsi_debug = ISCSI_INITIATOR_DEBUG;
73 SYSCTL_INT(_debug, OID_AUTO, iscsi_initiator, CTLFLAG_RW, &iscsi_debug, 0,
74 "iSCSI driver debug flag");
75
76 struct mtx iscsi_dbg_mtx;
77 #endif
78
79 static int max_sessions = MAX_SESSIONS;
80 SYSCTL_INT(_net, OID_AUTO, iscsi_initiator_max_sessions, CTLFLAG_RDTUN,
81 &max_sessions, 0, "Max sessions allowed");
82 static int max_pdus = MAX_PDUS;
83 SYSCTL_INT(_net, OID_AUTO, iscsi_initiator_max_pdus, CTLFLAG_RDTUN,
84 &max_pdus, 0, "Max PDU pool");
85
86 static char isid[6+1] = {
87 0x80,
88 'D',
89 'I',
90 'B',
91 '0',
92 '0',
93 0
94 };
95
96 static int i_create_session(struct cdev *dev, int *ndev);
97
98 static int i_ping(struct cdev *dev);
99 static int i_send(struct cdev *dev, caddr_t arg, struct thread *td);
100 static int i_recv(struct cdev *dev, caddr_t arg, struct thread *td);
101 static int i_setsoc(isc_session_t *sp, int fd, struct thread *td);
102 static int i_fullfeature(struct cdev *dev, int flag);
103
104 static d_open_t iscsi_open;
105 static d_close_t iscsi_close;
106 static d_ioctl_t iscsi_ioctl;
107 #ifdef ISCSI_INITIATOR_DEBUG
108 static d_read_t iscsi_read;
109 #endif
110
111 static struct cdevsw iscsi_cdevsw = {
112 .d_version = D_VERSION,
113 .d_open = iscsi_open,
114 .d_close = iscsi_close,
115 .d_ioctl = iscsi_ioctl,
116 #ifdef ISCSI_INITIATOR_DEBUG
117 .d_read = iscsi_read,
118 #endif
119 .d_name = "iSCSI",
120 };
121
122 static int
iscsi_open(struct cdev * dev,int flags,int otype,struct thread * td)123 iscsi_open(struct cdev *dev, int flags, int otype, struct thread *td)
124 {
125 debug_called(8);
126
127 debug(7, "dev=%d", dev2unit(dev));
128
129 if(dev2unit(dev) > max_sessions) {
130 // should not happen
131 return ENODEV;
132 }
133 return 0;
134 }
135
136 static int
iscsi_close(struct cdev * dev,int flag,int otyp,struct thread * td)137 iscsi_close(struct cdev *dev, int flag, int otyp, struct thread *td)
138 {
139 isc_session_t *sp;
140
141 debug_called(8);
142
143 debug(3, "session=%d flag=%x", dev2unit(dev), flag);
144
145 if(dev2unit(dev) == max_sessions) {
146 return 0;
147 }
148 sp = dev->si_drv2;
149 if(sp != NULL) {
150 sdebug(3, "sp->flags=%x", sp->flags );
151 /*
152 | if still in full phase, this probably means
153 | that something went really bad.
154 | it could be a result from 'shutdown', in which case
155 | we will ignore it (so buffers can be flushed).
156 | the problem is that there is no way of differentiating
157 | between a shutdown procedure and 'iscontrol' dying.
158 */
159 if(sp->flags & ISC_FFPHASE)
160 // delay in case this is a shutdown.
161 tsleep(sp, PRIBIO, "isc-cls", 60*hz);
162 ism_stop(sp);
163 }
164 debug(2, "done");
165 return 0;
166 }
167
168 static int
iscsi_ioctl(struct cdev * dev,u_long cmd,caddr_t arg,int mode,struct thread * td)169 iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode, struct thread *td)
170 {
171 struct isc_softc *sc;
172 isc_session_t *sp;
173 isc_opt_t *opt;
174 int error;
175
176 debug_called(8);
177
178 error = 0;
179 if(dev2unit(dev) == max_sessions) {
180 /*
181 | non Session commands
182 */
183 sc = dev->si_drv1;
184 if(sc == NULL)
185 return ENXIO;
186
187 switch(cmd) {
188 case ISCSISETSES:
189 error = i_create_session(dev, (int *)arg);
190 if(error == 0)
191 break;
192
193 default:
194 error = ENXIO;
195 }
196 return error;
197 }
198 /*
199 | session commands
200 */
201 sp = dev->si_drv2;
202 if(sp == NULL)
203 return ENXIO;
204
205 sdebug(6, "dev=%d cmd=%d", dev2unit(dev), (int)(cmd & 0xff));
206
207 switch(cmd) {
208 case ISCSISETSOC:
209 error = i_setsoc(sp, *(u_int *)arg, td);
210 break;
211
212 case ISCSISETOPT:
213 opt = (isc_opt_t *)arg;
214 error = i_setopt(sp, opt);
215 break;
216
217 case ISCSISEND:
218 error = i_send(dev, arg, td);
219 break;
220
221 case ISCSIRECV:
222 error = i_recv(dev, arg, td);
223 break;
224
225 case ISCSIPING:
226 error = i_ping(dev);
227 break;
228
229 case ISCSISTART:
230 error = sp->soc == NULL? ENOTCONN: i_fullfeature(dev, 1);
231 if(error == 0) {
232 sp->proc = td->td_proc;
233 SYSCTL_ADD_INT(&sp->clist, SYSCTL_CHILDREN(sp->oid),
234 OID_AUTO, "pid", CTLFLAG_RD,
235 &sp->proc->p_pid, sizeof(pid_t), "control process id");
236 }
237 break;
238
239 case ISCSIRESTART:
240 error = sp->soc == NULL? ENOTCONN: i_fullfeature(dev, 2);
241 break;
242
243 case ISCSISTOP:
244 error = i_fullfeature(dev, 0);
245 break;
246
247 case ISCSISIGNAL: {
248 int sig = *(int *)arg;
249
250 if(sig < 0 || sig > _SIG_MAXSIG)
251 error = EINVAL;
252 else
253 sp->signal = sig;
254 break;
255 }
256
257 case ISCSIGETCAM: {
258 iscsi_cam_t *cp = (iscsi_cam_t *)arg;
259
260 error = ic_getCamVals(sp, cp);
261 break;
262 }
263
264 default:
265 error = ENOIOCTL;
266 }
267
268 return error;
269 }
270
271 static int
iscsi_read(struct cdev * dev,struct uio * uio,int ioflag)272 iscsi_read(struct cdev *dev, struct uio *uio, int ioflag)
273 {
274 #ifdef ISCSI_INITIATOR_DEBUG
275 struct isc_softc *sc;
276 isc_session_t *sp;
277 pduq_t *pq;
278 char buf[1024];
279
280 sc = dev->si_drv1;
281 sp = dev->si_drv2;
282 if(dev2unit(dev) == max_sessions) {
283 sprintf(buf, "/----- Session ------/\n");
284 uiomove(buf, strlen(buf), uio);
285 int i = 0;
286
287 TAILQ_FOREACH(sp, &sc->isc_sess, sp_link) {
288 if(uio->uio_resid == 0)
289 return 0;
290 sprintf(buf, "%03d] '%s' '%s'\n", i++, sp->opt.targetAddress, sp->opt.targetName);
291 uiomove(buf, strlen(buf), uio);
292 }
293 sprintf(buf, "free npdu_alloc=%d, npdu_max=%d\n", sc->npdu_alloc, sc->npdu_max);
294 uiomove(buf, strlen(buf), uio);
295 }
296 else {
297 int i = 0;
298 struct socket *so = sp->soc;
299 #define pukeit(i, pq) do {\
300 sprintf(buf, "%03d] %06x %02x %06x %06x %jd\n",\
301 i, ntohl(pq->pdu.ipdu.bhs.CmdSN),\
302 pq->pdu.ipdu.bhs.opcode, ntohl(pq->pdu.ipdu.bhs.itt),\
303 ntohl(pq->pdu.ipdu.bhs.ExpStSN),\
304 (intmax_t)pq->ts.sec);\
305 } while(0)
306
307 sprintf(buf, "%d/%d /---- hld -----/\n", sp->stats.nhld, sp->stats.max_hld);
308 uiomove(buf, strlen(buf), uio);
309 TAILQ_FOREACH(pq, &sp->hld, pq_link) {
310 if(uio->uio_resid == 0)
311 return 0;
312 pukeit(i, pq); i++;
313 uiomove(buf, strlen(buf), uio);
314 }
315 sprintf(buf, "%d/%d /---- rsp -----/\n", sp->stats.nrsp, sp->stats.max_rsp);
316 uiomove(buf, strlen(buf), uio);
317 i = 0;
318 TAILQ_FOREACH(pq, &sp->rsp, pq_link) {
319 if(uio->uio_resid == 0)
320 return 0;
321 pukeit(i, pq); i++;
322 uiomove(buf, strlen(buf), uio);
323 }
324 sprintf(buf, "%d/%d /---- csnd -----/\n", sp->stats.ncsnd, sp->stats.max_csnd);
325 i = 0;
326 uiomove(buf, strlen(buf), uio);
327 TAILQ_FOREACH(pq, &sp->csnd, pq_link) {
328 if(uio->uio_resid == 0)
329 return 0;
330 pukeit(i, pq); i++;
331 uiomove(buf, strlen(buf), uio);
332 }
333 sprintf(buf, "%d/%d /---- wsnd -----/\n", sp->stats.nwsnd, sp->stats.max_wsnd);
334 i = 0;
335 uiomove(buf, strlen(buf), uio);
336 TAILQ_FOREACH(pq, &sp->wsnd, pq_link) {
337 if(uio->uio_resid == 0)
338 return 0;
339 pukeit(i, pq); i++;
340 uiomove(buf, strlen(buf), uio);
341 }
342 sprintf(buf, "%d/%d /---- isnd -----/\n", sp->stats.nisnd, sp->stats.max_isnd);
343 i = 0;
344 uiomove(buf, strlen(buf), uio);
345 TAILQ_FOREACH(pq, &sp->isnd, pq_link) {
346 if(uio->uio_resid == 0)
347 return 0;
348 pukeit(i, pq); i++;
349 uiomove(buf, strlen(buf), uio);
350 }
351
352 sprintf(buf, "/---- Stats ---/\n");
353 uiomove(buf, strlen(buf), uio);
354
355 sprintf(buf, "recv=%d sent=%d\n", sp->stats.nrecv, sp->stats.nsent);
356 uiomove(buf, strlen(buf), uio);
357
358 sprintf(buf, "flags=%x pdus: alloc=%d max=%d\n",
359 sp->flags, sc->npdu_alloc, sc->npdu_max);
360 uiomove(buf, strlen(buf), uio);
361
362 sprintf(buf, "cws=%d last cmd=%x exp=%x max=%x stat=%x itt=%x\n",
363 sp->cws, sp->sn.cmd, sp->sn.expCmd, sp->sn.maxCmd, sp->sn.stat, sp->sn.itt);
364 uiomove(buf, strlen(buf), uio);
365
366 sprintf(buf, "/---- socket -----/\nso_count=%d so_state=%x\n", so->so_count, so->so_state);
367 uiomove(buf, strlen(buf), uio);
368
369 }
370 #endif
371 return 0;
372 }
373
374 static int
i_ping(struct cdev * dev)375 i_ping(struct cdev *dev)
376 {
377 return 0;
378 }
379 /*
380 | low level I/O
381 */
382 static int
i_setsoc(isc_session_t * sp,int fd,struct thread * td)383 i_setsoc(isc_session_t *sp, int fd, struct thread *td)
384 {
385 cap_rights_t rights;
386 int error = 0;
387
388 if(sp->soc != NULL)
389 isc_stop_receiver(sp);
390
391 error = getsock_cap(td, fd, cap_rights_init(&rights, CAP_SOCK_CLIENT),
392 &sp->fp, NULL, NULL);
393 if(error)
394 return error;
395
396 sp->soc = sp->fp->f_data;
397 sp->td = td;
398 isc_start_receiver(sp);
399
400 return error;
401 }
402
403 static int
i_send(struct cdev * dev,caddr_t arg,struct thread * td)404 i_send(struct cdev *dev, caddr_t arg, struct thread *td)
405 {
406 isc_session_t *sp = dev->si_drv2;
407 caddr_t bp;
408 pduq_t *pq;
409 pdu_t *pp;
410 int n, error;
411
412 debug_called(8);
413
414 if(sp->soc == NULL)
415 return ENOTCONN;
416
417 if((pq = pdu_alloc(sp->isc, M_NOWAIT)) == NULL)
418 return EAGAIN;
419 pp = &pq->pdu;
420 pq->pdu = *(pdu_t *)arg;
421 if((error = i_prepPDU(sp, pq)) != 0)
422 goto out;
423
424 bp = NULL;
425 if((pq->len - sizeof(union ipdu_u)) > 0) {
426 pq->buf = bp = malloc(pq->len - sizeof(union ipdu_u), M_ISCSIBUF, M_NOWAIT);
427 if(pq->buf == NULL) {
428 error = EAGAIN;
429 goto out;
430 }
431 }
432 else
433 pq->buf = NULL; // just in case?
434
435 sdebug(2, "len=%d ahs_len=%d ds_len=%d buf=%zu@%p",
436 pq->len, pp->ahs_len, pp->ds_len, pq->len - sizeof(union ipdu_u), bp);
437
438 if(pp->ahs_len) {
439 // XXX: never tested, looks suspicious
440 n = pp->ahs_len;
441 error = copyin(pp->ahs_addr, bp, n);
442 if(error != 0) {
443 sdebug(3, "copyin ahs: error=%d", error);
444 goto out;
445 }
446 pp->ahs_addr = (ahs_t *)bp;
447 bp += n;
448 }
449 if(pp->ds_len) {
450 n = pp->ds_len;
451 error = copyin(pp->ds_addr, bp, n);
452 if(error != 0) {
453 sdebug(3, "copyin ds: error=%d", error);
454 goto out;
455 }
456 pp->ds_addr = bp;
457 bp += n;
458 while(n & 03) {
459 n++;
460 *bp++ = 0;
461 }
462 }
463
464 error = isc_qout(sp, pq);
465 if(error == 0)
466 wakeup(&sp->flags); // XXX: to 'push' proc_out ...
467 out:
468 if(error)
469 pdu_free(sp->isc, pq);
470
471 return error;
472 }
473
474 static int
i_recv(struct cdev * dev,caddr_t arg,struct thread * td)475 i_recv(struct cdev *dev, caddr_t arg, struct thread *td)
476 {
477 isc_session_t *sp = dev->si_drv2;
478 pduq_t *pq;
479 pdu_t *pp, *up;
480 caddr_t bp;
481 int error, mustfree, cnt;
482 size_t need, have, n;
483
484 debug_called(8);
485
486 if(sp == NULL)
487 return EIO;
488
489 if(sp->soc == NULL)
490 return ENOTCONN;
491 cnt = 6; // XXX: maybe the user can request a time out?
492 mtx_lock(&sp->rsp_mtx);
493 while((pq = TAILQ_FIRST(&sp->rsp)) == NULL) {
494 msleep(&sp->rsp, &sp->rsp_mtx, PRIBIO, "isc_rsp", hz*10);
495 if(cnt-- == 0) break; // XXX: for now, needs work
496 }
497 if(pq != NULL) {
498 sp->stats.nrsp--;
499 TAILQ_REMOVE(&sp->rsp, pq, pq_link);
500 }
501 mtx_unlock(&sp->rsp_mtx);
502
503 sdebug(6, "cnt=%d", cnt);
504
505 if(pq == NULL) {
506 error = ENOTCONN;
507 sdebug(3, "error=%d sp->flags=%x ", error, sp->flags);
508 return error;
509 }
510 up = (pdu_t *)arg;
511 pp = &pq->pdu;
512 up->ipdu = pp->ipdu;
513 n = 0;
514 up->ds_len = 0;
515 up->ahs_len = 0;
516 error = 0;
517
518 if(pq->mp) {
519 u_int len;
520
521 // Grr...
522 len = 0;
523 if(pp->ahs_len) {
524 len += pp->ahs_len;
525 }
526 if(pp->ds_len) {
527 len += pp->ds_len;
528 }
529
530 mustfree = 0;
531 if(len > pq->mp->m_len) {
532 mustfree++;
533 bp = malloc(len, M_TMP, M_WAITOK);
534 sdebug(4, "need mbufcopy: %d", len);
535 i_mbufcopy(pq->mp, bp, len);
536 }
537 else
538 bp = mtod(pq->mp, caddr_t);
539
540 if(pp->ahs_len) {
541 need = pp->ahs_len;
542 n = MIN(up->ahs_size, need);
543 error = copyout(bp, (caddr_t)up->ahs_addr, n);
544 up->ahs_len = n;
545 bp += need;
546 }
547 if(!error && pp->ds_len) {
548 need = pp->ds_len;
549 if((have = up->ds_size) == 0) {
550 have = up->ahs_size - n;
551 up->ds_addr = (caddr_t)up->ahs_addr + n;
552 }
553 n = MIN(have, need);
554 error = copyout(bp, (caddr_t)up->ds_addr, n);
555 up->ds_len = n;
556 }
557
558 if(mustfree)
559 free(bp, M_TMP);
560 }
561
562 sdebug(6, "len=%d ahs_len=%d ds_len=%d", pq->len, pp->ahs_len, pp->ds_len);
563
564 pdu_free(sp->isc, pq);
565
566 return error;
567 }
568
569 static int
i_fullfeature(struct cdev * dev,int flag)570 i_fullfeature(struct cdev *dev, int flag)
571 {
572 isc_session_t *sp = dev->si_drv2;
573 int error;
574
575 sdebug(2, "flag=%d", flag);
576
577 error = 0;
578 switch(flag) {
579 case 0: // stop
580 sp->flags &= ~ISC_FFPHASE;
581 break;
582 case 1: // start
583 sp->flags |= ISC_FFPHASE;
584 error = ic_init(sp);
585 break;
586 case 2: // restart
587 sp->flags |= ISC_FFPHASE;
588 ism_restart(sp);
589 break;
590 }
591 return error;
592 }
593
594 static int
i_create_session(struct cdev * dev,int * ndev)595 i_create_session(struct cdev *dev, int *ndev)
596 {
597 struct isc_softc *sc = dev->si_drv1;
598 isc_session_t *sp;
599 int error, n;
600
601 debug_called(8);
602
603 sp = malloc(sizeof(isc_session_t), M_ISCSI, M_WAITOK | M_ZERO);
604 if(sp == NULL)
605 return ENOMEM;
606
607 sx_xlock(&sc->unit_sx);
608 if((n = alloc_unr(sc->unit)) < 0) {
609 sx_unlock(&sc->unit_sx);
610 free(sp, M_ISCSI);
611 xdebug("too many sessions!");
612 return EPERM;
613 }
614 sx_unlock(&sc->unit_sx);
615
616 mtx_lock(&sc->isc_mtx);
617 TAILQ_INSERT_TAIL(&sc->isc_sess, sp, sp_link);
618 isc->nsess++;
619 mtx_unlock(&sc->isc_mtx);
620
621 sp->dev = make_dev(&iscsi_cdevsw, n, UID_ROOT, GID_WHEEL, 0600, "iscsi%d", n);
622 *ndev = sp->sid = n;
623 sp->isc = sc;
624 sp->dev->si_drv1 = sc;
625 sp->dev->si_drv2 = sp;
626
627 sp->opt.maxRecvDataSegmentLength = 8192;
628 sp->opt.maxXmitDataSegmentLength = 8192;
629 sp->opt.maxBurstLength = 65536; // 64k
630 sp->opt.maxluns = ISCSI_MAX_LUNS;
631
632 error = ism_start(sp);
633
634 return error;
635 }
636
637 #ifdef notused
638 static void
iscsi_counters(isc_session_t * sp)639 iscsi_counters(isc_session_t *sp)
640 {
641 int h, r, s;
642 pduq_t *pq;
643
644 #define _puke(i, pq) do {\
645 debug(2, "%03d] %06x %02x %x %ld %jd %x\n",\
646 i, ntohl( pq->pdu.ipdu.bhs.CmdSN), \
647 pq->pdu.ipdu.bhs.opcode, ntohl(pq->pdu.ipdu.bhs.itt),\
648 (long)pq->ts.sec, pq->ts.frac, pq->flags);\
649 } while(0)
650
651 h = r = s = 0;
652 TAILQ_FOREACH(pq, &sp->hld, pq_link) {
653 _puke(h, pq);
654 h++;
655 }
656 TAILQ_FOREACH(pq, &sp->rsp, pq_link) r++;
657 TAILQ_FOREACH(pq, &sp->csnd, pq_link) s++;
658 TAILQ_FOREACH(pq, &sp->wsnd, pq_link) s++;
659 TAILQ_FOREACH(pq, &sp->isnd, pq_link) s++;
660 debug(2, "hld=%d rsp=%d snd=%d", h, r, s);
661 }
662 #endif
663
664 static void
iscsi_shutdown(void * v)665 iscsi_shutdown(void *v)
666 {
667 struct isc_softc *sc = v;
668 isc_session_t *sp;
669 int n;
670
671 debug_called(8);
672 if(sc == NULL) {
673 xdebug("sc is NULL!");
674 return;
675 }
676 #ifdef DO_EVENTHANDLER
677 if(sc->eh == NULL)
678 debug(2, "sc->eh is NULL");
679 else {
680 EVENTHANDLER_DEREGISTER(shutdown_pre_sync, sc->eh);
681 debug(2, "done n=%d", sc->nsess);
682 }
683 #endif
684 n = 0;
685 TAILQ_FOREACH(sp, &sc->isc_sess, sp_link) {
686 debug(2, "%2d] sp->flags=0x%08x", n, sp->flags);
687 n++;
688 }
689 debug(2, "done");
690 }
691
692 static void
free_pdus(struct isc_softc * sc)693 free_pdus(struct isc_softc *sc)
694 {
695 debug_called(8);
696
697 if(sc->pdu_zone != NULL) {
698 uma_zdestroy(sc->pdu_zone);
699 sc->pdu_zone = NULL;
700 }
701 }
702
703 static int
iscsi_start(void)704 iscsi_start(void)
705 {
706 debug_called(8);
707
708 isc = malloc(sizeof(struct isc_softc), M_ISCSI, M_ZERO|M_WAITOK);
709 mtx_init(&isc->isc_mtx, "iscsi-isc", NULL, MTX_DEF);
710
711 TAILQ_INIT(&isc->isc_sess);
712 /*
713 | now init the free pdu list
714 */
715 isc->pdu_zone = uma_zcreate("pdu", sizeof(pduq_t),
716 NULL, NULL, NULL, NULL,
717 0, 0);
718 uma_zone_set_max(isc->pdu_zone, max_pdus);
719 isc->unit = new_unrhdr(0, max_sessions-1, NULL);
720 sx_init(&isc->unit_sx, "iscsi sx");
721
722 #ifdef DO_EVENTHANDLER
723 if((isc->eh = EVENTHANDLER_REGISTER(shutdown_pre_sync, iscsi_shutdown,
724 sc, SHUTDOWN_PRI_DEFAULT-1)) == NULL)
725 xdebug("shutdown event registration failed\n");
726 #endif
727 /*
728 | sysctl stuff
729 */
730 sysctl_ctx_init(&isc->clist);
731 isc->oid = SYSCTL_ADD_NODE(&isc->clist,
732 SYSCTL_STATIC_CHILDREN(_net),
733 OID_AUTO,
734 "iscsi_initiator",
735 CTLFLAG_RD,
736 0,
737 "iSCSI Subsystem");
738
739 SYSCTL_ADD_STRING(&isc->clist,
740 SYSCTL_CHILDREN(isc->oid),
741 OID_AUTO,
742 "driver_version",
743 CTLFLAG_RD,
744 iscsi_driver_version,
745 0,
746 "iscsi driver version");
747
748 SYSCTL_ADD_STRING(&isc->clist,
749 SYSCTL_CHILDREN(isc->oid),
750 OID_AUTO,
751 "isid",
752 CTLFLAG_RW,
753 isid,
754 6+1,
755 "initiator part of the Session Identifier");
756
757 SYSCTL_ADD_INT(&isc->clist,
758 SYSCTL_CHILDREN(isc->oid),
759 OID_AUTO,
760 "sessions",
761 CTLFLAG_RD,
762 &isc->nsess,
763 sizeof(isc->nsess),
764 "number of active session");
765
766 #ifdef ISCSI_INITIATOR_DEBUG
767 mtx_init(&iscsi_dbg_mtx, "iscsi_dbg", NULL, MTX_DEF);
768 #endif
769
770 isc->dev = make_dev_credf(MAKEDEV_CHECKNAME, &iscsi_cdevsw, max_sessions,
771 NULL, UID_ROOT, GID_WHEEL, 0600, "iscsi");
772 if (isc->dev == NULL) {
773 xdebug("iscsi_initiator: make_dev_credf failed");
774 return (EEXIST);
775 }
776 isc->dev->si_drv1 = isc;
777
778 printf("iscsi: version %s\n", iscsi_driver_version);
779 return (0);
780 }
781
782 /*
783 | Notes:
784 | unload SHOULD fail if there is activity
785 | activity: there is/are active session/s
786 */
787 static void
iscsi_stop(void)788 iscsi_stop(void)
789 {
790 isc_session_t *sp, *sp_tmp;
791
792 debug_called(8);
793
794 /*
795 | go through all the sessions
796 | Note: close should have done this ...
797 */
798 TAILQ_FOREACH_SAFE(sp, &isc->isc_sess, sp_link, sp_tmp) {
799 //XXX: check for activity ...
800 ism_stop(sp);
801 }
802 mtx_destroy(&isc->isc_mtx);
803 sx_destroy(&isc->unit_sx);
804
805 free_pdus(isc);
806
807 if(isc->dev)
808 destroy_dev(isc->dev);
809
810 if(sysctl_ctx_free(&isc->clist))
811 xdebug("sysctl_ctx_free failed");
812
813 iscsi_shutdown(isc); // XXX: check EVENTHANDLER_ ...
814
815 #ifdef ISCSI_INITIATOR_DEBUG
816 mtx_destroy(&iscsi_dbg_mtx);
817 #endif
818
819 free(isc, M_ISCSI);
820 }
821
822 static int
iscsi_modevent(module_t mod,int what,void * arg)823 iscsi_modevent(module_t mod, int what, void *arg)
824 {
825 int error = 0;
826
827 debug_called(8);
828
829 switch(what) {
830 case MOD_LOAD:
831 error = iscsi_start();
832 break;
833
834 case MOD_QUIESCE:
835 if(isc->nsess) {
836 xdebug("iscsi module busy(nsess=%d), cannot unload", isc->nsess);
837 log(LOG_ERR, "iscsi module busy, cannot unload");
838 }
839 return isc->nsess;
840
841 case MOD_SHUTDOWN:
842 break;
843
844 case MOD_UNLOAD:
845 iscsi_stop();
846 break;
847
848 default:
849 break;
850 }
851 return (error);
852 }
853
854 moduledata_t iscsi_mod = {
855 "iscsi_initiator",
856 (modeventhand_t) iscsi_modevent,
857 0
858 };
859
860 #ifdef ISCSI_ROOT
861 static void
iscsi_rootconf(void)862 iscsi_rootconf(void)
863 {
864 #if 0
865 nfs_setup_diskless();
866 if (nfs_diskless_valid)
867 rootdevnames[0] = "nfs:";
868 #endif
869 printf("** iscsi_rootconf **\n");
870 }
871
872 SYSINIT(cpu_rootconf1, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, iscsi_rootconf, NULL)
873 #endif
874
875 DECLARE_MODULE(iscsi_initiator, iscsi_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
876 MODULE_DEPEND(iscsi_initiator, cam, 1, 1, 1);
877