Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/dev/iscsi_initiator/iscsi_subr.c
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1 /*- 2 * Copyright (c) 2005-2010 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_subr.c 743 2009-08-08 10:54:53Z danny $ 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD: releng/10.0/sys/dev/iscsi_initiator/iscsi_subr.c 254657 2013-08-22 14:02:34Z trasz $"); 33 34 #include "opt_iscsi_initiator.h" 35 36 #include <sys/param.h> 37 #include <sys/kernel.h> 38 #include <sys/callout.h> 39 #include <sys/malloc.h> 40 #include <sys/mbuf.h> 41 #include <sys/kthread.h> 42 #include <sys/lock.h> 43 #include <sys/mutex.h> 44 #include <sys/uio.h> 45 #include <sys/sysctl.h> 46 #include <sys/sx.h> 47 48 #include <cam/cam.h> 49 #include <cam/cam_ccb.h> 50 #include <cam/cam_sim.h> 51 #include <cam/cam_xpt_sim.h> 52 #include <cam/cam_periph.h> 53 #include <cam/scsi/scsi_message.h> 54 #include <sys/eventhandler.h> 55 56 #include <dev/iscsi_initiator/iscsi.h> 57 #include <dev/iscsi_initiator/iscsivar.h> 58 59 /* 60 | Interface to the SCSI layer 61 */ 62 void 63 iscsi_r2t(isc_session_t *sp, pduq_t *opq, pduq_t *pq) 64 { 65 union ccb *ccb = opq->ccb; 66 struct ccb_scsiio *csio = &ccb->csio; 67 pdu_t *opp = &opq->pdu; 68 bhs_t *bhp = &opp->ipdu.bhs; 69 r2t_t *r2t = &pq->pdu.ipdu.r2t; 70 pduq_t *wpq; 71 int error; 72 73 debug_called(8); 74 sdebug(4, "itt=%x r2tSN=%d bo=%x ddtl=%x W=%d", ntohl(r2t->itt), 75 ntohl(r2t->r2tSN), ntohl(r2t->bo), ntohl(r2t->ddtl), opp->ipdu.scsi_req.W); 76 77 switch(bhp->opcode) { 78 case ISCSI_SCSI_CMD: 79 if(opp->ipdu.scsi_req.W) { 80 data_out_t *cmd; 81 u_int ddtl = ntohl(r2t->ddtl); 82 u_int edtl = ntohl(opp->ipdu.scsi_req.edtlen); 83 u_int bleft, bs, dsn, bo; 84 caddr_t bp = csio->data_ptr; 85 86 bo = ntohl(r2t->bo); 87 bp += MIN(bo, edtl - ddtl); 88 bleft = ddtl; 89 90 if(sp->opt.maxXmitDataSegmentLength > 0) // danny's RFC 91 bs = MIN(sp->opt.maxXmitDataSegmentLength, ddtl); 92 else 93 bs = ddtl; 94 dsn = 0; 95 sdebug(4, "edtl=%x ddtl=%x bo=%x dsn=%x bs=%x maxX=%x", 96 edtl, ddtl, bo, dsn, bs, sp->opt.maxXmitDataSegmentLength); 97 while(bleft > 0) { 98 wpq = pdu_alloc(sp->isc, M_NOWAIT); // testing ... 99 if(wpq == NULL) { 100 sdebug(3, "itt=%x r2tSN=%d bo=%x ddtl=%x W=%d", ntohl(r2t->itt), 101 ntohl(r2t->r2tSN), ntohl(r2t->bo), ntohl(r2t->ddtl), opp->ipdu.scsi_req.W); 102 sdebug(1, "npdu_max=%d npdu_alloc=%d", sp->isc->npdu_max, sp->isc->npdu_alloc); 103 104 while((wpq = pdu_alloc(sp->isc, M_NOWAIT)) == NULL) { 105 sdebug(2, "waiting..."); 106 #if __FreeBSD_version >= 700000 107 pause("isc_r2t", 5*hz); 108 #else 109 tsleep(sp->isc, 0, "isc_r2t", 5*hz); 110 #endif 111 } 112 } 113 cmd = &wpq->pdu.ipdu.data_out; 114 cmd->opcode = ISCSI_WRITE_DATA; 115 cmd->lun[0] = r2t->lun[0]; 116 cmd->lun[1] = r2t->lun[1]; 117 cmd->ttt = r2t->ttt; 118 cmd->itt = r2t->itt; 119 120 cmd->dsn = htonl(dsn); 121 cmd->bo = htonl(bo); 122 123 cmd->F = (bs < bleft)? 0: 1; // is this the last one? 124 bs = MIN(bs, bleft); 125 126 wpq->pdu.ds_len = bs; 127 wpq->pdu.ds_addr = bp; 128 129 error = isc_qout(sp, wpq); 130 sdebug(6, "bs=%x bo=%x bp=%p dsn=%x error=%d", bs, bo, bp, dsn, error); 131 if(error) 132 break; 133 bo += bs; 134 bp += bs; 135 bleft -= bs; 136 dsn++; 137 } 138 } 139 break; 140 141 default: 142 // XXX: should not happen ... 143 xdebug("huh? opcode=0x%x", bhp->opcode); 144 } 145 } 146 147 static int 148 getSenseData(u_int status, union ccb *ccb, pduq_t *pq) 149 { 150 pdu_t *pp = &pq->pdu; 151 struct ccb_scsiio *scsi = (struct ccb_scsiio *)ccb; 152 struct scsi_sense_data *sense = &scsi->sense_data; 153 struct mbuf *m = pq->mp; 154 scsi_rsp_t *cmd = &pp->ipdu.scsi_rsp; 155 caddr_t bp; 156 int sense_len, mustfree = 0; 157 int error_code, sense_key, asc, ascq; 158 159 bp = mtod(pq->mp, caddr_t); 160 if((sense_len = scsi_2btoul(bp)) == 0) 161 return 0; 162 debug(4, "sense_len=%d", sense_len); 163 /* 164 | according to the specs, the sense data cannot 165 | be larger than 252 ... 166 */ 167 if(sense_len > m->m_len) { 168 bp = malloc(sense_len, M_ISCSI, M_WAITOK); 169 debug(3, "calling i_mbufcopy(len=%d)", sense_len); 170 i_mbufcopy(pq->mp, bp, sense_len); 171 mustfree++; 172 } 173 scsi->scsi_status = status; 174 175 bcopy(bp+2, sense, min(sense_len, scsi->sense_len)); 176 scsi->sense_resid = 0; 177 if(cmd->flag & (BIT(1)|BIT(2))) 178 scsi->sense_resid = ntohl(pp->ipdu.scsi_rsp.rcnt); 179 scsi_extract_sense_len(sense, scsi->sense_len - scsi->sense_resid, 180 &error_code, &sense_key, &asc, &ascq, /*show_errors*/ 1); 181 182 debug(3, "sense_len=%d rcnt=%d sense_resid=%d dsl=%d error_code=%x flags=%x", 183 sense_len, 184 ntohl(pp->ipdu.scsi_rsp.rcnt), scsi->sense_resid, 185 pp->ds_len, error_code, sense_key); 186 187 if(mustfree) 188 free(bp, M_ISCSI); 189 190 return 1; 191 } 192 193 /* 194 | Some information is from SAM draft. 195 */ 196 static void 197 _scsi_done(isc_session_t *sp, u_int response, u_int status, union ccb *ccb, pduq_t *pq) 198 { 199 struct ccb_hdr *ccb_h = &ccb->ccb_h; 200 201 debug_called(8); 202 203 if(status || response) { 204 sdebug(3, "response=%x status=%x ccb=%p pq=%p", response, status, ccb, pq); 205 if(pq != NULL) 206 sdebug(3, "mp=%p buf=%p len=%d", pq->mp, pq->buf, pq->len); 207 } 208 ccb_h->status = 0; 209 switch(response) { 210 case 0: // Command Completed at Target 211 switch(status) { 212 case 0: // Good, all is ok 213 ccb_h->status = CAM_REQ_CMP; 214 break; 215 216 case 0x02: // Check Condition 217 if((pq != NULL) && (pq->mp != NULL) && getSenseData(status, ccb, pq)) 218 ccb_h->status |= CAM_AUTOSNS_VALID; 219 220 case 0x14: // Intermediate-Condition Met 221 case 0x10: // Intermediate 222 case 0x04: // Condition Met 223 ccb_h->status |= CAM_SCSI_STATUS_ERROR; 224 break; 225 226 case 0x08: 227 ccb_h->status = CAM_BUSY; 228 break; 229 230 case 0x18: // Reservation Conflict 231 case 0x28: // Task Set Full 232 ccb_h->status = CAM_REQUEUE_REQ; 233 break; 234 default: 235 //case 0x22: // Command Terminated 236 //case 0x30: // ACA Active 237 //case 0x40: // Task Aborted 238 ccb_h->status = CAM_REQ_CMP_ERR; //CAM_REQ_ABORTED; 239 } 240 break; 241 242 default: 243 if((response >= 0x80) && (response <= 0xFF)) { 244 // Vendor specific ... 245 } 246 case 1: // target failure 247 ccb_h->status = CAM_REQ_CMP_ERR; //CAM_REQ_ABORTED; 248 break; 249 } 250 sdebug(5, "ccb_h->status=%x", ccb_h->status); 251 252 XPT_DONE(sp, ccb); 253 } 254 255 /* 256 | returns the lowest cmdseq that was not acked 257 */ 258 int 259 iscsi_requeue(isc_session_t *sp) 260 { 261 pduq_t *pq; 262 u_int i, n, last; 263 264 debug_called(8); 265 i = last = 0; 266 sp->flags |= ISC_HOLD; 267 while((pq = i_dqueue_hld(sp)) != NULL) { 268 i++; 269 if(pq->ccb != NULL) { 270 _scsi_done(sp, 0, 0x28, pq->ccb, NULL); 271 n = ntohl(pq->pdu.ipdu.bhs.CmdSN); 272 if(last==0 || (last > n)) 273 last = n; 274 sdebug(2, "last=%x n=%x", last, n); 275 } 276 pdu_free(sp->isc, pq); 277 } 278 sp->flags &= ~ISC_HOLD; 279 return i? last: sp->sn.cmd; 280 } 281 282 int 283 i_pdu_flush(isc_session_t *sp) 284 { 285 int n = 0; 286 pduq_t *pq; 287 288 debug_called(8); 289 while((pq = i_dqueue_rsp(sp)) != NULL) { 290 pdu_free(sp->isc, pq); 291 n++; 292 } 293 while((pq = i_dqueue_rsv(sp)) != NULL) { 294 pdu_free(sp->isc, pq); 295 n++; 296 } 297 while((pq = i_dqueue_snd(sp, -1)) != NULL) { 298 pdu_free(sp->isc, pq); 299 n++; 300 } 301 while((pq = i_dqueue_hld(sp)) != NULL) { 302 pdu_free(sp->isc, pq); 303 n++; 304 } 305 while((pq = i_dqueue_wsnd(sp)) != NULL) { 306 pdu_free(sp->isc, pq); 307 n++; 308 } 309 if(n != 0) 310 xdebug("%d pdus recovered, should have been ZERO!", n); 311 return n; 312 } 313 /* 314 | called from ism_destroy. 315 */ 316 void 317 iscsi_cleanup(isc_session_t *sp) 318 { 319 pduq_t *pq, *pqtmp; 320 321 debug_called(8); 322 323 TAILQ_FOREACH_SAFE(pq, &sp->hld, pq_link, pqtmp) { 324 sdebug(3, "hld pq=%p", pq); 325 if(pq->ccb) 326 _scsi_done(sp, 1, 0x40, pq->ccb, NULL); 327 TAILQ_REMOVE(&sp->hld, pq, pq_link); 328 if(pq->buf) { 329 free(pq->buf, M_ISCSIBUF); 330 pq->buf = NULL; 331 } 332 pdu_free(sp->isc, pq); 333 } 334 while((pq = i_dqueue_snd(sp, BIT(0)|BIT(1)|BIT(2))) != NULL) { 335 sdebug(3, "pq=%p", pq); 336 if(pq->ccb) 337 _scsi_done(sp, 1, 0x40, pq->ccb, NULL); 338 if(pq->buf) { 339 free(pq->buf, M_ISCSIBUF); 340 pq->buf = NULL; 341 } 342 pdu_free(sp->isc, pq); 343 } 344 345 wakeup(&sp->rsp); 346 } 347 348 void 349 iscsi_done(isc_session_t *sp, pduq_t *opq, pduq_t *pq) 350 { 351 pdu_t *pp = &pq->pdu; 352 scsi_rsp_t *cmd = &pp->ipdu.scsi_rsp; 353 354 debug_called(8); 355 356 _scsi_done(sp, cmd->response, cmd->status, opq->ccb, pq); 357 358 pdu_free(sp->isc, opq); 359 } 360 361 // see RFC 3720, 10.9.1 page 146 362 /* 363 | NOTE: 364 | the call to isc_stop_receiver is a kludge, 365 | instead, it should be handled by the userland controller, 366 | but that means that there should be a better way, other than 367 | sending a signal. Somehow, this packet should be supplied to 368 | the userland via read. 369 */ 370 void 371 iscsi_async(isc_session_t *sp, pduq_t *pq) 372 { 373 pdu_t *pp = &pq->pdu; 374 async_t *cmd = &pp->ipdu.async; 375 376 debug_called(8); 377 378 sdebug(3, "asyncevent=0x%x asyncVCode=0x%0x", cmd->asyncEvent, cmd->asyncVCode); 379 switch(cmd->asyncEvent) { 380 case 0: // check status ... 381 break; 382 383 case 1: // target request logout 384 isc_stop_receiver(sp); // XXX: temporary solution 385 break; 386 387 case 2: // target indicates it wants to drop connection 388 isc_stop_receiver(sp); // XXX: temporary solution 389 break; 390 391 case 3: // target indicates it will drop all connections. 392 isc_stop_receiver(sp); // XXX: temporary solution 393 break; 394 395 case 4: // target request parameter negotiation 396 break; 397 398 default: 399 break; 400 } 401 } 402 403 void 404 iscsi_reject(isc_session_t *sp, pduq_t *opq, pduq_t *pq) 405 { 406 union ccb *ccb = opq->ccb; 407 //reject_t *reject = &pq->pdu.ipdu.reject; 408 409 debug_called(8); 410 //XXX: check RFC 10.17.1 (page 176) 411 ccb->ccb_h.status = CAM_REQ_ABORTED; 412 XPT_DONE(sp, ccb); 413 414 pdu_free(sp->isc, opq); 415 } 416 417 /* 418 | deal with lun 419 */ 420 static int 421 dwl(isc_session_t *sp, int lun, u_char *lp) 422 { 423 debug_called(8); 424 sdebug(4, "lun=%d", lun); 425 /* 426 | mapping LUN to iSCSI LUN 427 | check the SAM-2 specs 428 | hint: maxLUNS is a small number, cam's LUN is 32bits 429 | iSCSI is 64bits, scsi is ? 430 */ 431 // XXX: check if this will pass the endian test 432 if(lun < 256) { 433 lp[0] = 0; 434 lp[1] = lun; 435 } else 436 if(lun < 16384) { 437 lp[0] = (1 << 5) | ((lun >> 8) & 0x3f); 438 lp[1] = lun & 0xff; 439 } 440 else { 441 xdebug("lun %d: is unsupported!", lun); 442 return -1; 443 } 444 445 return 0; 446 } 447 448 /* 449 | encapsulate the scsi command and 450 */ 451 int 452 scsi_encap(struct cam_sim *sim, union ccb *ccb) 453 { 454 isc_session_t *sp = cam_sim_softc(sim); 455 struct ccb_scsiio *csio = &ccb->csio; 456 struct ccb_hdr *ccb_h = &ccb->ccb_h; 457 pduq_t *pq; 458 scsi_req_t *cmd; 459 460 debug_called(8); 461 462 debug(4, "ccb->sp=%p", ccb_h->spriv_ptr0); 463 sp = ccb_h->spriv_ptr0; 464 465 if((pq = pdu_alloc(sp->isc, M_NOWAIT)) == NULL) { 466 debug(2, "ccb->sp=%p", ccb_h->spriv_ptr0); 467 sdebug(1, "pdu_alloc failed sc->npdu_max=%d npdu_alloc=%d", 468 sp->isc->npdu_max, sp->isc->npdu_alloc); 469 while((pq = pdu_alloc(sp->isc, M_NOWAIT)) == NULL) { 470 sdebug(2, "waiting..."); 471 #if __FreeBSD_version >= 700000 472 pause("isc_encap", 5*hz); 473 #else 474 tsleep(sp->isc, 0, "isc_encap", 5*hz); 475 #endif 476 } 477 } 478 cmd = &pq->pdu.ipdu.scsi_req; 479 cmd->opcode = ISCSI_SCSI_CMD; 480 cmd->F = 1; 481 #if 0 482 // this breaks at least Isilon's iscsi target. 483 /* 484 | map tag option, default is UNTAGGED 485 */ 486 switch(csio->tag_action) { 487 case MSG_SIMPLE_Q_TAG: cmd->attr = iSCSI_TASK_SIMPLE; break; 488 case MSG_HEAD_OF_Q_TAG: cmd->attr = iSCSI_TASK_HOFQ; break; 489 case MSG_ORDERED_Q_TAG: cmd->attr = iSCSI_TASK_ORDER; break; 490 case MSG_ACA_TASK: cmd->attr = iSCSI_TASK_ACA; break; 491 } 492 #else 493 cmd->attr = iSCSI_TASK_SIMPLE; 494 #endif 495 496 dwl(sp, ccb_h->target_lun, (u_char *)&cmd->lun); 497 498 if((ccb_h->flags & CAM_CDB_POINTER) != 0) { 499 if((ccb_h->flags & CAM_CDB_PHYS) == 0) { 500 if(csio->cdb_len > 16) { 501 sdebug(3, "oversize cdb %d > 16", csio->cdb_len); 502 goto invalid; 503 } 504 } 505 else { 506 sdebug(3, "not phys"); 507 goto invalid; 508 } 509 } 510 511 if(csio->cdb_len > sizeof(cmd->cdb)) 512 xdebug("guevalt! %d > %ld", csio->cdb_len, (long)sizeof(cmd->cdb)); 513 514 memcpy(cmd->cdb, 515 ccb_h->flags & CAM_CDB_POINTER? csio->cdb_io.cdb_ptr: csio->cdb_io.cdb_bytes, 516 csio->cdb_len); 517 518 cmd->W = (ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT; 519 cmd->R = (ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN; 520 cmd->edtlen = htonl(csio->dxfer_len); 521 522 pq->ccb = ccb; 523 /* 524 | place it in the out queue 525 */ 526 if(isc_qout(sp, pq) == 0) 527 return 1; 528 invalid: 529 ccb->ccb_h.status = CAM_REQ_INVALID; 530 pdu_free(sp->isc, pq); 531 532 return 0; 533 } 534 535 int 536 scsi_decap(isc_session_t *sp, pduq_t *opq, pduq_t *pq) 537 { 538 union ccb *ccb = opq->ccb; 539 struct ccb_scsiio *csio = &ccb->csio; 540 pdu_t *opp = &opq->pdu; 541 bhs_t *bhp = &opp->ipdu.bhs; 542 543 debug_called(8); 544 sdebug(6, "pq=%p opq=%p bhp->opcode=0x%x len=%d", 545 pq, opq, bhp->opcode, pq->pdu.ds_len); 546 if(ccb == NULL) { 547 sdebug(1, "itt=0x%x pq=%p opq=%p bhp->opcode=0x%x len=%d", 548 ntohl(pq->pdu.ipdu.bhs.itt), 549 pq, opq, bhp->opcode, pq->pdu.ds_len); 550 xdebug("%d] ccb == NULL!", sp->sid); 551 return 0; 552 } 553 if(pq->pdu.ds_len != 0) { 554 switch(bhp->opcode) { 555 case ISCSI_SCSI_CMD: { 556 scsi_req_t *cmd = &opp->ipdu.scsi_req; 557 sdebug(5, "itt=0x%x opcode=%x R=%d", 558 ntohl(pq->pdu.ipdu.bhs.itt), 559 pq->pdu.ipdu.bhs.opcode, cmd->R); 560 561 switch(pq->pdu.ipdu.bhs.opcode) { 562 case ISCSI_READ_DATA: // SCSI Data in 563 { 564 caddr_t bp = NULL; // = mtod(pq->mp, caddr_t); 565 data_in_t *rcmd = &pq->pdu.ipdu.data_in; 566 567 if(cmd->R) { 568 sdebug(5, "copy to=%p from=%p l1=%d l2=%d mp@%p", 569 csio->data_ptr, bp? mtod(pq->mp, caddr_t): 0, 570 ntohl(cmd->edtlen), pq->pdu.ds_len, pq->mp); 571 if(ntohl(cmd->edtlen) >= pq->pdu.ds_len) { 572 int offset, len = pq->pdu.ds_len; 573 574 if(pq->mp != NULL) { 575 caddr_t dp; 576 577 offset = ntohl(rcmd->bo); 578 dp = csio->data_ptr + offset; 579 i_mbufcopy(pq->mp, dp, len); 580 } 581 } 582 else { 583 xdebug("edtlen=%d < ds_len=%d", 584 ntohl(cmd->edtlen), pq->pdu.ds_len); 585 } 586 } 587 if(rcmd->S) { 588 /* 589 | contains also the SCSI Status 590 */ 591 _scsi_done(sp, 0, rcmd->status, opq->ccb, NULL); 592 return 0; 593 } else 594 return 1; 595 } 596 break; 597 } 598 } 599 default: 600 sdebug(3, "opcode=%02x", bhp->opcode); 601 break; 602 } 603 } 604 /* 605 | XXX: error ... 606 */ 607 return 1; 608 }
Cache object: 88fc6bb3aea4227e615960e434980d4a
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