2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2005-2011 Daniel Braniss <danny@cs.huji.ac.il>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
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
20 * FOR 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
32 | $Id: iscsivar.h 743 2009-08-08 10:54:53Z danny $
35 #include <sys/mutex.h>
37 #define ISCSI_MAX_LUNS 128 // don't touch this
38 #if ISCSI_MAX_LUNS > 8
41 | sysctl kern.cam.cam_srch_hi=1
45 #ifndef ISCSI_INITIATOR_DEBUG
46 #define ISCSI_INITIATOR_DEBUG 1
49 #ifdef ISCSI_INITIATOR_DEBUG
50 extern int iscsi_debug;
51 #define debug(level, fmt, args...) do {if(level <= iscsi_debug)\
52 printf("%s: " fmt "\n", __func__ , ##args);} while(0)
53 #define sdebug(level, fmt, args...) do {if(level <= iscsi_debug)\
54 printf("%d] %s: " fmt "\n", sp->sid, __func__ , ##args);} while(0)
55 #define debug_called(level) do {if(level <= iscsi_debug)\
56 printf("%s: called\n", __func__);} while(0)
58 #define debug(level, fmt, args...)
59 #define debug_called(level)
60 #define sdebug(level, fmt, args...)
61 #endif /* ISCSI_INITIATOR_DEBUG */
63 #define xdebug(fmt, args...) printf(">>> %s: " fmt "\n", __func__ , ##args)
65 #define MAX_SESSIONS ISCSI_MAX_TARGETS
66 #define MAX_PDUS (MAX_SESSIONS*256) // XXX: at the moment this is arbitrary
68 typedef uint32_t digest_t(const void *, int len, uint32_t ocrc);
70 MALLOC_DECLARE(M_ISCSI);
71 MALLOC_DECLARE(M_ISCSIBUF);
73 #define ISOK2DIG(dig, pp) ((dig != NULL) && ((pp->ipdu.bhs.opcode & 0x1f) != ISCSI_LOGIN_CMD))
76 #define BIT(n) (1 <<(n))
79 #define ISC_SM_RUN BIT(0)
80 #define ISC_SM_RUNNING BIT(1)
82 #define ISC_LINK_UP BIT(2)
83 #define ISC_CON_RUN BIT(3)
84 #define ISC_CON_RUNNING BIT(4)
85 #define ISC_KILL BIT(5)
86 #define ISC_OQNOTEMPTY BIT(6)
87 #define ISC_OWAITING BIT(7)
88 #define ISC_FFPHASE BIT(8)
90 #define ISC_CAMDEVS BIT(9)
91 #define ISC_SCANWAIT BIT(10)
93 #define ISC_MEMWAIT BIT(11)
94 #define ISC_SIGNALED BIT(12)
96 #define ISC_HOLD BIT(15)
97 #define ISC_HOLDED BIT(16)
99 #define ISC_SHUTDOWN BIT(31)
105 int npdu; // number of pdus malloc'ed.
106 int nrecv; // unprocessed received pdus
107 int nsent; // sent pdus
116 struct bintime t_sent;
117 struct bintime t_recv;
124 typedef TAILQ_HEAD(, pduq) queue_t;
126 typedef struct isc_session {
127 TAILQ_ENTRY(isc_session) sp_link;
134 struct proc *proc; // the userland process
136 struct proc *soc_proc;
137 struct proc *stp; // the sm thread
139 struct isc_softc *isc;
141 digest_t *hdrDigest; // the digest alg. if any
142 digest_t *dataDigest; // the digest alg. if any
144 int sid; // Session ID
145 sn_t sn; // sequence number stuff;
146 int cws; // current window size
148 int target_nluns; // this and target_lun are
149 // hopefully temporal till I
150 // figure out a better way.
151 int target_lun[ISCSI_MAX_LUNS/(sizeof(int)*8) + 1];
165 isc_opt_t opt; // negotiable values
167 struct i_stats stats;
174 struct cam_sim *cam_sim;
175 struct cam_path *cam_path;
180 struct sysctl_ctx_list clist;
181 struct sysctl_oid *oid;
182 int douio; //XXX: turn on/off uio on read
185 typedef struct pduq {
186 TAILQ_ENTRY(pduq) pq_link;
189 u_int len; // the total length of the pdu
194 struct iovec iov[5]; // XXX: careful ...
203 TAILQ_HEAD(,isc_session) isc_sess;
206 char isid[6]; // Initiator Session ID (48 bits)
210 uma_zone_t pdu_zone; // pool of free pdu's
211 TAILQ_HEAD(,pduq) freepdu;
213 #ifdef ISCSI_INITIATOR_DEBUG
214 int npdu_alloc, npdu_max; // for instrumentation
216 #ifdef DO_EVENTHANDLER
222 struct sysctl_ctx_list clist;
223 struct sysctl_oid *oid;
226 #ifdef ISCSI_INITIATOR_DEBUG
227 extern struct mtx iscsi_dbg_mtx;
230 void isc_start_receiver(isc_session_t *sp);
231 void isc_stop_receiver(isc_session_t *sp);
233 int isc_sendPDU(isc_session_t *sp, pduq_t *pq);
234 int isc_qout(isc_session_t *sp, pduq_t *pq);
235 int i_prepPDU(isc_session_t *sp, pduq_t *pq);
237 int ism_fullfeature(struct cdev *dev, int flag);
239 int i_pdu_flush(isc_session_t *sc);
240 int i_setopt(isc_session_t *sp, isc_opt_t *opt);
241 void i_freeopt(isc_opt_t *opt);
243 int ic_init(isc_session_t *sp);
244 void ic_destroy(isc_session_t *sp);
245 void ic_lost_target(isc_session_t *sp, int target);
246 int ic_getCamVals(isc_session_t *sp, iscsi_cam_t *cp);
248 void ism_recv(isc_session_t *sp, pduq_t *pq);
249 int ism_start(isc_session_t *sp);
250 void ism_restart(isc_session_t *sp);
251 void ism_stop(isc_session_t *sp);
253 int scsi_encap(struct cam_sim *sim, union ccb *ccb);
254 int scsi_decap(isc_session_t *sp, pduq_t *opq, pduq_t *pq);
255 void iscsi_r2t(isc_session_t *sp, pduq_t *opq, pduq_t *pq);
256 void iscsi_done(isc_session_t *sp, pduq_t *opq, pduq_t *pq);
257 void iscsi_reject(isc_session_t *sp, pduq_t *opq, pduq_t *pq);
258 void iscsi_async(isc_session_t *sp, pduq_t *pq);
259 void iscsi_cleanup(isc_session_t *sp);
260 int iscsi_requeue(isc_session_t *sp);
262 // Serial Number Arithmetic
263 #define _MAXINCR 0x7FFFFFFF // 2 ^ 31 - 1
264 #define SNA_GT(i1, i2) ((i1 != i2) && (\
265 (i1 < i2 && i2 - i1 > _MAXINCR) ||\
266 (i1 > i2 && i1 - i2 < _MAXINCR))?1: 0)
271 static __inline pduq_t *
272 pdu_alloc(struct isc_softc *isc, int wait)
276 pq = (pduq_t *)uma_zalloc(isc->pdu_zone, wait /* M_WAITOK or M_NOWAIT*/);
278 debug(7, "out of mem");
281 #ifdef ISCSI_INITIATOR_DEBUG
282 mtx_lock(&iscsi_dbg_mtx);
284 if(isc->npdu_alloc > isc->npdu_max)
285 isc->npdu_max = isc->npdu_alloc;
286 mtx_unlock(&iscsi_dbg_mtx);
288 memset(pq, 0, sizeof(pduq_t));
294 pdu_free(struct isc_softc *isc, pduq_t *pq)
300 free(pq->buf, M_ISCSIBUF);
302 uma_zfree(isc->pdu_zone, pq);
303 #ifdef ISCSI_INITIATOR_DEBUG
304 mtx_lock(&iscsi_dbg_mtx);
306 mtx_unlock(&iscsi_dbg_mtx);
311 i_nqueue_rsp(isc_session_t *sp, pduq_t *pq)
313 mtx_lock(&sp->rsp_mtx);
314 if(++sp->stats.nrsp > sp->stats.max_rsp)
315 sp->stats.max_rsp = sp->stats.nrsp;
316 TAILQ_INSERT_TAIL(&sp->rsp, pq, pq_link);
317 mtx_unlock(&sp->rsp_mtx);
320 static __inline pduq_t *
321 i_dqueue_rsp(isc_session_t *sp)
325 mtx_lock(&sp->rsp_mtx);
326 if((pq = TAILQ_FIRST(&sp->rsp)) != NULL) {
328 TAILQ_REMOVE(&sp->rsp, pq, pq_link);
330 mtx_unlock(&sp->rsp_mtx);
336 i_nqueue_rsv(isc_session_t *sp, pduq_t *pq)
338 mtx_lock(&sp->rsv_mtx);
339 if(++sp->stats.nrsv > sp->stats.max_rsv)
340 sp->stats.max_rsv = sp->stats.nrsv;
341 TAILQ_INSERT_TAIL(&sp->rsv, pq, pq_link);
342 mtx_unlock(&sp->rsv_mtx);
345 static __inline pduq_t *
346 i_dqueue_rsv(isc_session_t *sp)
350 mtx_lock(&sp->rsv_mtx);
351 if((pq = TAILQ_FIRST(&sp->rsv)) != NULL) {
353 TAILQ_REMOVE(&sp->rsv, pq, pq_link);
355 mtx_unlock(&sp->rsv_mtx);
361 i_nqueue_csnd(isc_session_t *sp, pduq_t *pq)
363 mtx_lock(&sp->snd_mtx);
364 if(++sp->stats.ncsnd > sp->stats.max_csnd)
365 sp->stats.max_csnd = sp->stats.ncsnd;
366 TAILQ_INSERT_TAIL(&sp->csnd, pq, pq_link);
367 mtx_unlock(&sp->snd_mtx);
370 static __inline pduq_t *
371 i_dqueue_csnd(isc_session_t *sp)
375 mtx_lock(&sp->snd_mtx);
376 if((pq = TAILQ_FIRST(&sp->csnd)) != NULL) {
378 TAILQ_REMOVE(&sp->csnd, pq, pq_link);
380 mtx_unlock(&sp->snd_mtx);
386 i_nqueue_isnd(isc_session_t *sp, pduq_t *pq)
388 mtx_lock(&sp->snd_mtx);
389 if(++sp->stats.nisnd > sp->stats.max_isnd)
390 sp->stats.max_isnd = sp->stats.nisnd;
391 TAILQ_INSERT_TAIL(&sp->isnd, pq, pq_link);
392 mtx_unlock(&sp->snd_mtx);
395 static __inline pduq_t *
396 i_dqueue_isnd(isc_session_t *sp)
400 mtx_lock(&sp->snd_mtx);
401 if((pq = TAILQ_FIRST(&sp->isnd)) != NULL) {
403 TAILQ_REMOVE(&sp->isnd, pq, pq_link);
405 mtx_unlock(&sp->snd_mtx);
411 i_nqueue_wsnd(isc_session_t *sp, pduq_t *pq)
413 mtx_lock(&sp->snd_mtx);
414 if(++sp->stats.nwsnd > sp->stats.max_wsnd)
415 sp->stats.max_wsnd = sp->stats.nwsnd;
416 TAILQ_INSERT_TAIL(&sp->wsnd, pq, pq_link);
417 mtx_unlock(&sp->snd_mtx);
420 static __inline pduq_t *
421 i_dqueue_wsnd(isc_session_t *sp)
425 mtx_lock(&sp->snd_mtx);
426 if((pq = TAILQ_FIRST(&sp->wsnd)) != NULL) {
428 TAILQ_REMOVE(&sp->wsnd, pq, pq_link);
430 mtx_unlock(&sp->snd_mtx);
435 static __inline pduq_t *
436 i_dqueue_snd(isc_session_t *sp, int which)
441 mtx_lock(&sp->snd_mtx);
442 if((which & BIT(0)) && (pq = TAILQ_FIRST(&sp->isnd)) != NULL) {
444 TAILQ_REMOVE(&sp->isnd, pq, pq_link);
445 pq->pduq = &sp->isnd; // remember where you came from
447 if((which & BIT(1)) && (pq = TAILQ_FIRST(&sp->wsnd)) != NULL) {
449 TAILQ_REMOVE(&sp->wsnd, pq, pq_link);
450 pq->pduq = &sp->wsnd; // remember where you came from
452 if((which & BIT(2)) && (pq = TAILQ_FIRST(&sp->csnd)) != NULL) {
454 TAILQ_REMOVE(&sp->csnd, pq, pq_link);
455 pq->pduq = &sp->csnd; // remember where you came from
457 mtx_unlock(&sp->snd_mtx);
463 i_rqueue_pdu(isc_session_t *sp, pduq_t *pq)
465 mtx_lock(&sp->snd_mtx);
466 KASSERT(pq->pduq != NULL, ("pq->pduq is NULL"));
467 TAILQ_INSERT_TAIL(pq->pduq, pq, pq_link);
468 mtx_unlock(&sp->snd_mtx);
472 | Waiting for ACK (or something :-)
475 i_nqueue_hld(isc_session_t *sp, pduq_t *pq)
478 mtx_lock(&sp->hld_mtx);
479 if(++sp->stats.nhld > sp->stats.max_hld)
480 sp->stats.max_hld = sp->stats.nhld;
481 TAILQ_INSERT_TAIL(&sp->hld, pq, pq_link);
482 mtx_unlock(&sp->hld_mtx);
487 i_remove_hld(isc_session_t *sp, pduq_t *pq)
489 mtx_lock(&sp->hld_mtx);
491 TAILQ_REMOVE(&sp->hld, pq, pq_link);
492 mtx_unlock(&sp->hld_mtx);
495 static __inline pduq_t *
496 i_dqueue_hld(isc_session_t *sp)
500 mtx_lock(&sp->hld_mtx);
501 if((pq = TAILQ_FIRST(&sp->hld)) != NULL) {
503 TAILQ_REMOVE(&sp->hld, pq, pq_link);
505 mtx_unlock(&sp->hld_mtx);
510 static __inline pduq_t *
511 i_search_hld(isc_session_t *sp, int itt, int keep)
517 mtx_lock(&sp->hld_mtx);
518 TAILQ_FOREACH_SAFE(pq, &sp->hld, pq_link, tmp) {
519 if(pq->pdu.ipdu.bhs.itt == itt) {
522 TAILQ_REMOVE(&sp->hld, pq, pq_link);
527 mtx_unlock(&sp->hld_mtx);
533 i_acked_hld(isc_session_t *sp, pdu_t *op)
536 u_int exp = sp->sn.expCmd;
539 mtx_lock(&sp->hld_mtx);
540 TAILQ_FOREACH_SAFE(pq, &sp->hld, pq_link, tmp) {
541 if((op && op->ipdu.bhs.itt == pq->pdu.ipdu.bhs.itt)
543 && (pq->pdu.ipdu.bhs.opcode != ISCSI_WRITE_DATA)
544 && SNA_GT(exp, ntohl(pq->pdu.ipdu.bhs.ExpStSN)))) {
546 TAILQ_REMOVE(&sp->hld, pq, pq_link);
547 pdu_free(sp->isc, pq);
550 mtx_unlock(&sp->hld_mtx);
554 i_mbufcopy(struct mbuf *mp, caddr_t dp, int len)
559 for(m = mp; m != NULL; m = m->m_next) {
560 bp = mtod(m, caddr_t);
562 | the pdu is word (4 octed) aligned
565 memcpy(dp, bp, MIN(len, m->m_len));