iscsi_main.c revision 1.1.6.1
1 /* $netBSD: iscsi_main.c,v 1.1.1.1 2011/05/02 07:01:11 agc Exp $ */ 2 3 /*- 4 * Copyright (c) 2004,2005,2006,2011 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Wasabi Systems, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 #include "iscsi_globals.h" 32 33 #include <sys/systm.h> 34 #include <sys/buf.h> 35 #include <sys/kmem.h> 36 #include <sys/socketvar.h> 37 38 39 /*------------------------- Global Variables ------------------------*/ 40 41 extern struct cfdriver iscsi_cd; 42 43 #if defined(ISCSI_DEBUG) 44 int debug_level = ISCSI_DEBUG; 45 #endif 46 47 #if defined(ISCSI_PERFTEST) 48 int perf_level = 0; 49 #endif 50 51 /* Device Structure */ 52 iscsi_softc_t *sc = NULL; 53 54 /* the list of sessions */ 55 session_list_t sessions = TAILQ_HEAD_INITIALIZER(sessions); 56 57 /* connections to clean up */ 58 connection_list_t cleanup_list = TAILQ_HEAD_INITIALIZER(cleanup_list); 59 bool detaching = FALSE; 60 struct lwp *cleanproc = NULL; 61 62 /* the number of active send threads (for cleanup thread) */ 63 uint32_t num_send_threads = 0; 64 65 /* Our node name, alias, and ISID */ 66 uint8_t InitiatorName[ISCSI_STRING_LENGTH] = ""; 67 uint8_t InitiatorAlias[ISCSI_STRING_LENGTH] = ""; 68 login_isid_t InitiatorISID; 69 70 /******************************************************************************/ 71 72 /* 73 System interface: autoconf and device structures 74 */ 75 76 void iscsiattach(int); 77 void iscsi_attach(device_t parent, device_t self, void *aux); 78 int iscsi_match(device_t, cfdata_t, void *); 79 int iscsi_detach(device_t, int); 80 81 82 CFATTACH_DECL_NEW(iscsi, sizeof(struct iscsi_softc), iscsi_match, iscsi_attach, 83 iscsi_detach, NULL); 84 85 86 int iscsiopen(dev_t, int, int, PTHREADOBJ); 87 int iscsiclose(dev_t, int, int, PTHREADOBJ); 88 89 struct cdevsw iscsi_cdevsw = { 90 iscsiopen, iscsiclose, 91 noread, nowrite, 92 iscsiioctl, nostop, notty, nopoll, nommap, nokqfilter, D_OTHER 93 }; 94 95 /******************************************************************************/ 96 97 STATIC void iscsi_scsipi_request(struct scsipi_channel *, 98 scsipi_adapter_req_t, void *); 99 STATIC void iscsi_minphys(struct buf *); 100 101 /******************************************************************************/ 102 103 /******************************************************************************* 104 * Open and Close device interfaces. We don't really need them, because we don't 105 * have to keep track of device opens and closes from userland. But apps can't 106 * call ioctl without a handle to the device, and the kernel doesn't hand out 107 * handles without an open routine in the driver. So here they are in all their 108 * glory... 109 *******************************************************************************/ 110 111 int 112 iscsiopen(dev_t dev, int flag, int mode, PTHREADOBJ p) 113 { 114 115 DEB(99, ("ISCSI Open\n")); 116 return 0; 117 } 118 119 int 120 iscsiclose(dev_t dev, int flag, int mode, PTHREADOBJ p) 121 { 122 123 DEB(99, ("ISCSI Close\n")); 124 return 0; 125 } 126 127 /******************************************************************************/ 128 129 /* 130 * The config Match routine. 131 * Not much to do here, either - this is a pseudo-device. 132 */ 133 134 int 135 iscsi_match(device_t self, cfdata_t cfdata, void *arg) 136 { 137 return 1; 138 } 139 140 /* 141 * iscsiattach: 142 * Only called when statically configured into a kernel 143 */ 144 void 145 iscsiattach(int n) 146 { 147 int err; 148 cfdata_t cf; 149 150 err = config_cfattach_attach(iscsi_cd.cd_name, &iscsi_ca); 151 if (err) { 152 aprint_error("%s: couldn't register cfattach: %d\n", 153 iscsi_cd.cd_name, err); 154 config_cfdriver_detach(&iscsi_cd); 155 return; 156 } 157 158 if (n > 1) 159 aprint_error("%s: only one device supported\n", 160 iscsi_cd.cd_name); 161 162 cf = kmem_alloc(sizeof(struct cfdata), KM_NOSLEEP); 163 if (cf == NULL) { 164 aprint_error("%s: couldn't allocate cfdata\n", 165 iscsi_cd.cd_name); 166 return; 167 } 168 cf->cf_name = iscsi_cd.cd_name; 169 cf->cf_atname = iscsi_cd.cd_name; 170 cf->cf_unit = 0; 171 cf->cf_fstate = FSTATE_NOTFOUND; 172 173 (void)config_attach_pseudo(cf); 174 return; 175 } 176 177 /* 178 * iscsi_attach: 179 * One-time inits go here. Not much for now, probably even less later. 180 */ 181 void 182 iscsi_attach(device_t parent, device_t self, void *aux) 183 { 184 185 DEBOUT(("ISCSI: iscsi_attach, parent=%p, self=%p, aux=%p\n", parent, 186 self, aux)); 187 sc = (iscsi_softc_t *) device_private(self); 188 sc->sc_dev = self; 189 if (kthread_create(PRI_NONE, 0, NULL, iscsi_cleanup_thread, 190 NULL, &cleanproc, "Cleanup") != 0) { 191 panic("Can't create cleanup thread!"); 192 } 193 aprint_normal("%s: attached. major = %d\n", iscsi_cd.cd_name, 194 cdevsw_lookup_major(&iscsi_cdevsw)); 195 } 196 197 /* 198 * iscsi_detach: 199 * Cleanup. 200 */ 201 int 202 iscsi_detach(device_t self, int flags) 203 { 204 205 DEBOUT(("ISCSI: detach\n")); 206 kill_all_sessions(); 207 detaching = TRUE; 208 while (cleanproc != NULL) { 209 wakeup(&cleanup_list); 210 tsleep(&cleanup_list, PWAIT, "detach_wait", 20); 211 } 212 return 0; 213 } 214 215 /******************************************************************************/ 216 217 typedef struct quirktab_t { 218 const char *tgt; 219 size_t tgtlen; 220 const char *iqn; 221 size_t iqnlen; 222 uint32_t quirks; 223 } quirktab_t; 224 225 static const quirktab_t quirktab[] = { 226 { "StarWind", 8, 227 "iqn.2008-08.com.starwindsoftware", 32, 228 PQUIRK_ONLYBIG }, 229 { "UNH", 3, 230 "iqn.2002-10.edu.unh.", 20, 231 PQUIRK_NOBIGMODESENSE | 232 PQUIRK_NOMODESENSE | 233 PQUIRK_NOSYNCCACHE }, 234 { "NetBSD", 6, 235 "iqn.1994-04.org.netbsd.", 23, 236 0 }, 237 { "Unknown", 7, 238 "unknown", 7, 239 0 }, 240 { NULL, 0, NULL, 0, 0 } 241 }; 242 243 /* loop through the quirktab looking for a match on target name */ 244 static const quirktab_t * 245 getquirks(const char *iqn) 246 { 247 const quirktab_t *qp; 248 249 if (iqn == NULL) { 250 iqn = "unknown"; 251 } 252 for (qp = quirktab ; qp->iqn ; qp++) { 253 if (strncmp(qp->iqn, iqn, qp->iqnlen) == 0) { 254 break; 255 } 256 } 257 return qp; 258 } 259 260 /******************************************************************************/ 261 262 /* 263 * map_session 264 * This (indirectly) maps the existing LUNs for a target to SCSI devices 265 * by going through config_found to tell any child drivers that there's 266 * a new adapter. 267 * Note that each session is equivalent to a SCSI adapter. 268 * 269 * Parameter: the session pointer 270 * 271 * Returns: 1 on success, 0 on failure 272 * 273 * ToDo: Figuring out how to handle more than one LUN. It appears that 274 * the NetBSD SCSI LUN discovery doesn't use "report LUNs", and instead 275 * goes through the LUNs sequentially, stopping somewhere on the way if it 276 * gets an error. We may have to do some LUN mapping in here if this is 277 * really how things work. 278 */ 279 280 int 281 map_session(session_t *session) 282 { 283 struct scsipi_adapter *adapt = &session->sc_adapter; 284 struct scsipi_channel *chan = &session->sc_channel; 285 const quirktab_t *tgt; 286 287 if (sc == NULL) { 288 /* we haven't gone through the config process */ 289 /* (shouldn't happen) */ 290 DEBOUT(("Map: No device pointer!\n")); 291 return 0; 292 } 293 /* 294 * Fill in the scsipi_adapter. 295 */ 296 adapt->adapt_dev = sc->sc_dev; 297 adapt->adapt_nchannels = 1; 298 adapt->adapt_request = iscsi_scsipi_request; 299 adapt->adapt_minphys = iscsi_minphys; 300 adapt->adapt_openings = CCBS_PER_SESSION; 301 adapt->adapt_max_periph = CCBS_PER_SESSION; 302 303 /* 304 * Fill in the scsipi_channel. 305 */ 306 if ((tgt = getquirks(chan->chan_name)) == NULL) { 307 tgt = getquirks("unknown"); 308 } 309 chan->chan_name = tgt->tgt; 310 chan->chan_defquirks = tgt->quirks; 311 chan->chan_adapter = adapt; 312 chan->chan_bustype = &scsi_bustype; 313 chan->chan_channel = 0; 314 chan->chan_flags = SCSIPI_CHAN_NOSETTLE; 315 chan->chan_ntargets = 1; 316 chan->chan_nluns = 16; /* ToDo: ??? */ 317 chan->chan_id = session->id; 318 319 session->child_dev = config_found(sc->sc_dev, chan, scsiprint); 320 321 return session->child_dev != NULL; 322 } 323 324 325 /* 326 * unmap_session 327 * This (indirectly) unmaps the existing all LUNs for a target by 328 * telling the config system that the adapter has detached. 329 * 330 * Parameter: the session pointer 331 */ 332 333 void 334 unmap_session(session_t *session) 335 { 336 device_t dev; 337 338 if ((dev = session->child_dev) != NULL) { 339 session->child_dev = NULL; 340 config_detach(dev, DETACH_FORCE); 341 } 342 } 343 344 /******************************************************************************/ 345 346 /***************************************************************************** 347 * SCSI interface routines 348 *****************************************************************************/ 349 350 /* 351 * iscsi_scsipi_request: 352 * Perform a request for the SCSIPI layer. 353 */ 354 355 void 356 iscsi_scsipi_request(struct scsipi_channel *chan, scsipi_adapter_req_t req, 357 void *arg) 358 { 359 struct scsipi_adapter *adapt = chan->chan_adapter; 360 struct scsipi_xfer *xs; 361 session_t *session; 362 int flags; 363 364 session = (session_t *) adapt; /* adapter is first field in session */ 365 366 switch (req) { 367 case ADAPTER_REQ_RUN_XFER: 368 DEB(9, ("ISCSI: scsipi_request RUN_XFER\n")); 369 xs = arg; 370 flags = xs->xs_control; 371 372 if ((flags & XS_CTL_POLL) != 0) { 373 xs->error = XS_DRIVER_STUFFUP; 374 DEBOUT(("Run Xfer request with polling\n")); 375 scsipi_done(xs); 376 return; 377 } 378 /* 379 * NOTE: It appears that XS_CTL_DATA_UIO is not actually used anywhere. 380 * Since it really would complicate matters to handle offsets 381 * into scatter-gather lists, and a number of other drivers don't 382 * handle uio-based data as well, XS_CTL_DATA_UIO isn't 383 * implemented in this driver (at least for now). 384 */ 385 if (flags & XS_CTL_DATA_UIO) { 386 xs->error = XS_DRIVER_STUFFUP; 387 DEBOUT(("Run Xfer with data in UIO\n")); 388 scsipi_done(xs); 389 return; 390 } 391 392 send_run_xfer(session, xs); 393 DEB(9, ("scsipi_req returns\n")); 394 return; 395 396 case ADAPTER_REQ_GROW_RESOURCES: 397 DEBOUT(("ISCSI: scsipi_request GROW_RESOURCES\n")); 398 return; 399 400 case ADAPTER_REQ_SET_XFER_MODE: 401 DEB(5, ("ISCSI: scsipi_request SET_XFER_MODE\n")); 402 return; 403 404 default: 405 break; 406 } 407 DEBOUT(("ISCSI: scsipi_request with invalid REQ code %d\n", req)); 408 } 409 410 /* cap the transfer at 64K */ 411 #define ISCSI_MAX_XFER 65536 412 413 /* 414 * iscsi_minphys: 415 * Limit a transfer to our maximum transfer size. 416 */ 417 418 void 419 iscsi_minphys(struct buf *bp) 420 { 421 if (bp->b_bcount > ISCSI_MAX_XFER) { 422 bp->b_bcount = ISCSI_MAX_XFER; 423 } 424 } 425 426 /***************************************************************************** 427 * SCSI job execution helper routines 428 *****************************************************************************/ 429 430 /* 431 * iscsi_done: 432 * 433 * A CCB has completed execution. Pass the status back to the 434 * upper layer. 435 */ 436 void 437 iscsi_done(ccb_t *ccb) 438 { 439 struct scsipi_xfer *xs = ccb->xs; 440 /*DEBOUT (("iscsi_done\n")); */ 441 442 if (xs != NULL) { 443 xs->resid = ccb->residual; 444 445 switch (ccb->status) { 446 case ISCSI_STATUS_SUCCESS: 447 xs->error = 0; 448 break; 449 450 case ISCSI_STATUS_CHECK_CONDITION: 451 xs->error = XS_SENSE; 452 xs->error = XS_SENSE; 453 #ifdef ISCSI_DEBUG 454 { 455 uint8_t *s = (uint8_t *) (&xs->sense); 456 DEB(5, ("Scsipi_done, error=XS_SENSE, sense data=%02x " 457 "%02x %02x %02x...\n", 458 s[0], s[1], s[2], s[3])); 459 } 460 #endif 461 break; 462 463 case ISCSI_STATUS_TARGET_BUSY: 464 xs->error = XS_BUSY; 465 break; 466 467 case ISCSI_STATUS_SOCKET_ERROR: 468 case ISCSI_STATUS_TIMEOUT: 469 xs->error = XS_SELTIMEOUT; 470 break; 471 472 default: 473 xs->error = XS_DRIVER_STUFFUP; 474 break; 475 } 476 477 DEB(99, ("Calling scsipi_done (%p), err = %d\n", xs, xs->error)); 478 scsipi_done(xs); 479 DEB(99, ("scsipi_done returned\n")); 480 } 481 482 free_ccb(ccb); 483 } 484 485 /* Kernel Module support */ 486 487 #include <sys/module.h> 488 489 MODULE(MODULE_CLASS_DRIVER, iscsi, NULL); 490 static const struct cfiattrdata ibescsi_info = { "scsi", 1, 491 {{"channel", "-1", -1},} 492 }; 493 static const struct cfiattrdata *const iscsi_attrs[] = { &ibescsi_info, NULL }; 494 495 #ifdef _MODULE 496 CFDRIVER_DECL(iscsi, DV_DULL, iscsi_attrs); 497 498 static struct cfdata iscsi_cfdata[] = { 499 { 500 .cf_name = "iscsi", 501 .cf_atname = "iscsi", 502 .cf_unit = 0, /* Only unit 0 is ever used */ 503 .cf_fstate = FSTATE_NOTFOUND, 504 .cf_loc = NULL, 505 .cf_flags = 0, 506 .cf_pspec = NULL, 507 }, 508 { NULL, NULL, 0, 0, NULL, 0, NULL } 509 }; 510 #endif 511 512 static int 513 iscsi_modcmd(modcmd_t cmd, void *arg) 514 { 515 #ifdef _MODULE 516 devmajor_t cmajor = NODEVMAJOR, bmajor = NODEVMAJOR; 517 int error; 518 #endif 519 520 switch (cmd) { 521 case MODULE_CMD_INIT: 522 #ifdef _MODULE 523 error = config_cfdriver_attach(&iscsi_cd); 524 if (error) { 525 return error; 526 } 527 528 error = config_cfattach_attach(iscsi_cd.cd_name, &iscsi_ca); 529 if (error) { 530 config_cfdriver_detach(&iscsi_cd); 531 aprint_error("%s: unable to register cfattach\n", 532 iscsi_cd.cd_name); 533 return error; 534 } 535 536 error = config_cfdata_attach(iscsi_cfdata, 1); 537 if (error) { 538 aprint_error("%s: unable to attach cfdata\n", 539 iscsi_cd.cd_name); 540 config_cfattach_detach(iscsi_cd.cd_name, &iscsi_ca); 541 config_cfdriver_detach(&iscsi_cd); 542 return error; 543 } 544 545 error = devsw_attach(iscsi_cd.cd_name, NULL, &bmajor, 546 &iscsi_cdevsw, &cmajor); 547 if (error) { 548 aprint_error("%s: unable to register devsw\n", 549 iscsi_cd.cd_name); 550 config_cfdata_detach(iscsi_cfdata); 551 config_cfattach_detach(iscsi_cd.cd_name, &iscsi_ca); 552 config_cfdriver_detach(&iscsi_cd); 553 return error; 554 } 555 556 if (config_attach_pseudo(iscsi_cfdata) == NULL) { 557 aprint_error("%s: config_attach_pseudo failed\n", 558 iscsi_cd.cd_name); 559 config_cfattach_detach(iscsi_cd.cd_name, &iscsi_ca); 560 config_cfdriver_detach(&iscsi_cd); 561 return ENXIO; 562 } 563 #endif 564 return 0; 565 break; 566 567 case MODULE_CMD_FINI: 568 #ifdef _MODULE 569 error = config_cfdata_detach(iscsi_cfdata); 570 if (error) 571 return error; 572 573 config_cfattach_detach(iscsi_cd.cd_name, &iscsi_ca); 574 config_cfdriver_detach(&iscsi_cd); 575 devsw_detach(NULL, &iscsi_cdevsw); 576 #endif 577 return 0; 578 break; 579 580 case MODULE_CMD_AUTOUNLOAD: 581 return EBUSY; 582 break; 583 584 default: 585 return ENOTTY; 586 break; 587 } 588 } 589
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