1 /*- 2 * Copyright (c) 2012 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Edward Tomasz Napierala under sponsorship 6 * from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #include <sys/param.h> 33 #include <sys/condvar.h> 34 #include <sys/conf.h> 35 #include <sys/eventhandler.h> 36 #include <sys/file.h> 37 #include <sys/kernel.h> 38 #include <sys/kthread.h> 39 #include <sys/lock.h> 40 #include <sys/malloc.h> 41 #include <sys/mutex.h> 42 #include <sys/module.h> 43 #include <sys/sysctl.h> 44 #include <sys/systm.h> 45 #include <sys/sx.h> 46 #include <vm/uma.h> 47 48 #include <cam/cam.h> 49 #include <cam/cam_ccb.h> 50 #include <cam/cam_xpt.h> 51 #include <cam/cam_debug.h> 52 #include <cam/cam_sim.h> 53 #include <cam/cam_xpt_sim.h> 54 #include <cam/cam_xpt_periph.h> 55 #include <cam/cam_periph.h> 56 #include <cam/scsi/scsi_all.h> 57 #include <cam/scsi/scsi_message.h> 58 59 #include "iscsi_ioctl.h" 60 #include "iscsi.h" 61 #include "icl.h" 62 #include "iscsi_proto.h" 63 64 #ifdef ICL_KERNEL_PROXY 65 #include <sys/socketvar.h> 66 #endif 67 68 /* 69 * XXX: This is global so the iscsi_unload() can access it. 70 * Think about how to do this properly. 71 */ 72 static struct iscsi_softc *sc; 73 74 SYSCTL_NODE(_kern, OID_AUTO, iscsi, CTLFLAG_RD, 0, "iSCSI initiator"); 75 static int debug = 1; 76 TUNABLE_INT("kern.iscsi.debug", &debug); 77 SYSCTL_INT(_kern_iscsi, OID_AUTO, debug, CTLFLAG_RW, 78 &debug, 2, "Enable debug messages"); 79 static int ping_timeout = 5; 80 TUNABLE_INT("kern.iscsi.ping_timeout", &ping_timeout); 81 SYSCTL_INT(_kern_iscsi, OID_AUTO, ping_timeout, CTLFLAG_RW, &ping_timeout, 82 5, "Timeout for ping (NOP-Out) requests, in seconds"); 83 static int iscsid_timeout = 60; 84 TUNABLE_INT("kern.iscsi.iscsid_timeout", &iscsid_timeout); 85 SYSCTL_INT(_kern_iscsi, OID_AUTO, iscsid_timeout, CTLFLAG_RW, &iscsid_timeout, 86 60, "Time to wait for iscsid(8) to handle reconnection, in seconds"); 87 static int login_timeout = 60; 88 TUNABLE_INT("kern.iscsi.login_timeout", &login_timeout); 89 SYSCTL_INT(_kern_iscsi, OID_AUTO, login_timeout, CTLFLAG_RW, &login_timeout, 90 60, "Time to wait for iscsid(8) to finish Login Phase, in seconds"); 91 static int maxtags = 255; 92 TUNABLE_INT("kern.iscsi.maxtags", &maxtags); 93 SYSCTL_INT(_kern_iscsi, OID_AUTO, maxtags, CTLFLAG_RW, &maxtags, 94 255, "Max number of IO requests queued"); 95 96 static MALLOC_DEFINE(M_ISCSI, "iSCSI", "iSCSI initiator"); 97 static uma_zone_t iscsi_outstanding_zone; 98 99 #define CONN_SESSION(X) ((struct iscsi_session *)X->ic_prv0) 100 #define PDU_SESSION(X) (CONN_SESSION(X->ip_conn)) 101 102 #define ISCSI_DEBUG(X, ...) \ 103 if (debug > 1) { \ 104 printf("%s: " X "\n", __func__, ## __VA_ARGS__);\ 105 } while (0) 106 107 #define ISCSI_WARN(X, ...) \ 108 if (debug > 0) { \ 109 printf("WARNING: %s: " X "\n", \ 110 __func__, ## __VA_ARGS__); \ 111 } while (0) 112 113 #define ISCSI_SESSION_DEBUG(S, X, ...) \ 114 if (debug > 1) { \ 115 printf("%s: %s (%s): " X "\n", \ 116 __func__, S->is_conf.isc_target_addr, \ 117 S->is_conf.isc_target, ## __VA_ARGS__); \ 118 } while (0) 119 120 #define ISCSI_SESSION_WARN(S, X, ...) \ 121 if (debug > 0) { \ 122 printf("WARNING: %s (%s): " X "\n", \ 123 S->is_conf.isc_target_addr, \ 124 S->is_conf.isc_target, ## __VA_ARGS__); \ 125 } while (0) 126 127 #define ISCSI_SESSION_LOCK(X) mtx_lock(&X->is_lock) 128 #define ISCSI_SESSION_UNLOCK(X) mtx_unlock(&X->is_lock) 129 #define ISCSI_SESSION_LOCK_ASSERT(X) mtx_assert(&X->is_lock, MA_OWNED) 130 131 static int iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, 132 int mode, struct thread *td); 133 134 static struct cdevsw iscsi_cdevsw = { 135 .d_version = D_VERSION, 136 .d_ioctl = iscsi_ioctl, 137 .d_name = "iscsi", 138 }; 139 140 static void iscsi_pdu_queue_locked(struct icl_pdu *request); 141 static void iscsi_pdu_queue(struct icl_pdu *request); 142 static void iscsi_pdu_update_statsn(const struct icl_pdu *response); 143 static void iscsi_pdu_handle_nop_in(struct icl_pdu *response); 144 static void iscsi_pdu_handle_scsi_response(struct icl_pdu *response); 145 static void iscsi_pdu_handle_data_in(struct icl_pdu *response); 146 static void iscsi_pdu_handle_logout_response(struct icl_pdu *response); 147 static void iscsi_pdu_handle_r2t(struct icl_pdu *response); 148 static void iscsi_pdu_handle_async_message(struct icl_pdu *response); 149 static void iscsi_pdu_handle_reject(struct icl_pdu *response); 150 static void iscsi_session_reconnect(struct iscsi_session *is); 151 static void iscsi_session_terminate(struct iscsi_session *is); 152 static void iscsi_action(struct cam_sim *sim, union ccb *ccb); 153 static void iscsi_poll(struct cam_sim *sim); 154 static struct iscsi_outstanding *iscsi_outstanding_find(struct iscsi_session *is, 155 uint32_t initiator_task_tag); 156 static int iscsi_outstanding_add(struct iscsi_session *is, 157 uint32_t initiator_task_tag, union ccb *ccb); 158 static void iscsi_outstanding_remove(struct iscsi_session *is, 159 struct iscsi_outstanding *io); 160 161 static bool 162 iscsi_pdu_prepare(struct icl_pdu *request) 163 { 164 struct iscsi_session *is; 165 struct iscsi_bhs_scsi_command *bhssc; 166 167 is = PDU_SESSION(request); 168 169 ISCSI_SESSION_LOCK_ASSERT(is); 170 171 /* 172 * We're only using fields common for all the request 173 * (initiator -> target) PDUs. 174 */ 175 bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs; 176 177 /* 178 * Data-Out PDU does not contain CmdSN. 179 */ 180 if (bhssc->bhssc_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_OUT) { 181 if (is->is_cmdsn > is->is_maxcmdsn && 182 (bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) { 183 /* 184 * Current MaxCmdSN prevents us from sending any more 185 * SCSI Command PDUs to the target; postpone the PDU. 186 * It will get resent by either iscsi_pdu_queue(), 187 * or by maintenance thread. 188 */ 189 #if 0 190 ISCSI_SESSION_DEBUG(is, "postponing send, CmdSN %d, ExpCmdSN %d, MaxCmdSN %d, opcode 0x%x", 191 is->is_cmdsn, is->is_expcmdsn, is->is_maxcmdsn, bhssc->bhssc_opcode); 192 #endif 193 return (true); 194 } 195 bhssc->bhssc_cmdsn = htonl(is->is_cmdsn); 196 if ((bhssc->bhssc_opcode & ISCSI_BHS_OPCODE_IMMEDIATE) == 0) 197 is->is_cmdsn++; 198 } 199 bhssc->bhssc_expstatsn = htonl(is->is_statsn + 1); 200 201 return (false); 202 } 203 204 static void 205 iscsi_session_send_postponed(struct iscsi_session *is) 206 { 207 struct icl_pdu *request; 208 bool postpone; 209 210 ISCSI_SESSION_LOCK_ASSERT(is); 211 212 while (!TAILQ_EMPTY(&is->is_postponed)) { 213 request = TAILQ_FIRST(&is->is_postponed); 214 postpone = iscsi_pdu_prepare(request); 215 if (postpone) 216 break; 217 TAILQ_REMOVE(&is->is_postponed, request, ip_next); 218 icl_pdu_queue(request); 219 } 220 } 221 222 static void 223 iscsi_pdu_queue_locked(struct icl_pdu *request) 224 { 225 struct iscsi_session *is; 226 bool postpone; 227 228 is = PDU_SESSION(request); 229 ISCSI_SESSION_LOCK_ASSERT(is); 230 iscsi_session_send_postponed(is); 231 postpone = iscsi_pdu_prepare(request); 232 if (postpone) { 233 TAILQ_INSERT_TAIL(&is->is_postponed, request, ip_next); 234 return; 235 } 236 icl_pdu_queue(request); 237 } 238 239 static void 240 iscsi_pdu_queue(struct icl_pdu *request) 241 { 242 struct iscsi_session *is; 243 244 is = PDU_SESSION(request); 245 ISCSI_SESSION_LOCK(is); 246 iscsi_pdu_queue_locked(request); 247 ISCSI_SESSION_UNLOCK(is); 248 } 249 250 static void 251 iscsi_session_logout(struct iscsi_session *is) 252 { 253 struct icl_pdu *request; 254 struct iscsi_bhs_logout_request *bhslr; 255 256 request = icl_pdu_new_bhs(is->is_conn, M_NOWAIT); 257 if (request == NULL) 258 return; 259 260 bhslr = (struct iscsi_bhs_logout_request *)request->ip_bhs; 261 bhslr->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_REQUEST; 262 bhslr->bhslr_reason = BHSLR_REASON_CLOSE_SESSION; 263 iscsi_pdu_queue_locked(request); 264 } 265 266 static void 267 iscsi_session_terminate_tasks(struct iscsi_session *is, bool requeue) 268 { 269 struct iscsi_outstanding *io, *tmp; 270 271 ISCSI_SESSION_LOCK_ASSERT(is); 272 273 TAILQ_FOREACH_SAFE(io, &is->is_outstanding, io_next, tmp) { 274 if (requeue) { 275 io->io_ccb->ccb_h.status &= ~CAM_SIM_QUEUED; 276 io->io_ccb->ccb_h.status |= CAM_REQUEUE_REQ; 277 } else { 278 io->io_ccb->ccb_h.status = CAM_REQ_ABORTED; 279 } 280 281 if ((io->io_ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 282 xpt_freeze_devq(io->io_ccb->ccb_h.path, 1); 283 ISCSI_SESSION_DEBUG(is, "freezing devq"); 284 } 285 io->io_ccb->ccb_h.status |= CAM_DEV_QFRZN; 286 xpt_done(io->io_ccb); 287 iscsi_outstanding_remove(is, io); 288 } 289 } 290 291 static void 292 iscsi_maintenance_thread_reconnect(struct iscsi_session *is) 293 { 294 struct icl_pdu *pdu; 295 296 icl_conn_shutdown(is->is_conn); 297 icl_conn_close(is->is_conn); 298 299 ISCSI_SESSION_LOCK(is); 300 301 #ifdef ICL_KERNEL_PROXY 302 if (is->is_login_pdu != NULL) { 303 icl_pdu_free(is->is_login_pdu); 304 is->is_login_pdu = NULL; 305 } 306 cv_signal(&is->is_login_cv); 307 #endif 308 309 /* 310 * Don't queue any new PDUs. 311 */ 312 if (is->is_sim != NULL && is->is_simq_frozen == false) { 313 ISCSI_SESSION_DEBUG(is, "freezing"); 314 xpt_freeze_simq(is->is_sim, 1); 315 is->is_simq_frozen = true; 316 } 317 318 /* 319 * Remove postponed PDUs. 320 */ 321 while (!TAILQ_EMPTY(&is->is_postponed)) { 322 pdu = TAILQ_FIRST(&is->is_postponed); 323 TAILQ_REMOVE(&is->is_postponed, pdu, ip_next); 324 icl_pdu_free(pdu); 325 } 326 327 /* 328 * Terminate SCSI tasks, asking CAM to requeue them. 329 */ 330 //ISCSI_SESSION_DEBUG(is, "terminating tasks"); 331 iscsi_session_terminate_tasks(is, true); 332 333 KASSERT(TAILQ_EMPTY(&is->is_outstanding), 334 ("destroying session with active tasks")); 335 KASSERT(TAILQ_EMPTY(&is->is_postponed), 336 ("destroying session with postponed PDUs")); 337 338 /* 339 * Request immediate reconnection from iscsid(8). 340 */ 341 //ISCSI_SESSION_DEBUG(is, "waking up iscsid(8)"); 342 is->is_connected = false; 343 is->is_reconnecting = false; 344 is->is_login_phase = false; 345 is->is_waiting_for_iscsid = true; 346 strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason)); 347 is->is_timeout = 0; 348 ISCSI_SESSION_UNLOCK(is); 349 cv_signal(&is->is_softc->sc_cv); 350 } 351 352 static void 353 iscsi_maintenance_thread_terminate(struct iscsi_session *is) 354 { 355 struct iscsi_softc *sc; 356 struct icl_pdu *pdu; 357 358 sc = is->is_softc; 359 sx_xlock(&sc->sc_lock); 360 TAILQ_REMOVE(&sc->sc_sessions, is, is_next); 361 sx_xunlock(&sc->sc_lock); 362 363 icl_conn_close(is->is_conn); 364 365 ISCSI_SESSION_LOCK(is); 366 367 KASSERT(is->is_terminating, ("is_terminating == false")); 368 369 #ifdef ICL_KERNEL_PROXY 370 if (is->is_login_pdu != NULL) { 371 icl_pdu_free(is->is_login_pdu); 372 is->is_login_pdu = NULL; 373 } 374 cv_signal(&is->is_login_cv); 375 #endif 376 377 /* 378 * Don't queue any new PDUs. 379 */ 380 callout_drain(&is->is_callout); 381 if (is->is_sim != NULL && is->is_simq_frozen == false) { 382 ISCSI_SESSION_DEBUG(is, "freezing"); 383 xpt_freeze_simq(is->is_sim, 1); 384 is->is_simq_frozen = true; 385 } 386 387 /* 388 * Remove postponed PDUs. 389 */ 390 while (!TAILQ_EMPTY(&is->is_postponed)) { 391 pdu = TAILQ_FIRST(&is->is_postponed); 392 TAILQ_REMOVE(&is->is_postponed, pdu, ip_next); 393 icl_pdu_free(pdu); 394 } 395 396 /* 397 * Forcibly terminate SCSI tasks. 398 */ 399 ISCSI_SESSION_DEBUG(is, "terminating tasks"); 400 iscsi_session_terminate_tasks(is, false); 401 402 /* 403 * Deregister CAM. 404 */ 405 if (is->is_sim != NULL) { 406 ISCSI_SESSION_DEBUG(is, "deregistering SIM"); 407 xpt_async(AC_LOST_DEVICE, is->is_path, NULL); 408 409 if (is->is_simq_frozen) { 410 xpt_release_simq(is->is_sim, 1); 411 is->is_simq_frozen = false; 412 } 413 414 xpt_free_path(is->is_path); 415 xpt_bus_deregister(cam_sim_path(is->is_sim)); 416 cam_sim_free(is->is_sim, TRUE /*free_devq*/); 417 is->is_sim = NULL; 418 } 419 420 KASSERT(TAILQ_EMPTY(&is->is_outstanding), 421 ("destroying session with active tasks")); 422 KASSERT(TAILQ_EMPTY(&is->is_postponed), 423 ("destroying session with postponed PDUs")); 424 425 ISCSI_SESSION_UNLOCK(is); 426 427 icl_conn_free(is->is_conn); 428 mtx_destroy(&is->is_lock); 429 cv_destroy(&is->is_maintenance_cv); 430 #ifdef ICL_KERNEL_PROXY 431 cv_destroy(&is->is_login_cv); 432 #endif 433 ISCSI_SESSION_DEBUG(is, "terminated"); 434 free(is, M_ISCSI); 435 436 /* 437 * The iscsi_unload() routine might be waiting. 438 */ 439 cv_signal(&sc->sc_cv); 440 } 441 442 static void 443 iscsi_maintenance_thread(void *arg) 444 { 445 struct iscsi_session *is; 446 447 is = arg; 448 449 for (;;) { 450 ISCSI_SESSION_LOCK(is); 451 if (is->is_reconnecting == false && 452 is->is_terminating == false && 453 TAILQ_EMPTY(&is->is_postponed)) 454 cv_wait(&is->is_maintenance_cv, &is->is_lock); 455 456 if (is->is_reconnecting) { 457 ISCSI_SESSION_UNLOCK(is); 458 iscsi_maintenance_thread_reconnect(is); 459 continue; 460 } 461 462 if (is->is_terminating) { 463 ISCSI_SESSION_UNLOCK(is); 464 iscsi_maintenance_thread_terminate(is); 465 kthread_exit(); 466 return; 467 } 468 469 iscsi_session_send_postponed(is); 470 ISCSI_SESSION_UNLOCK(is); 471 } 472 } 473 474 static void 475 iscsi_session_reconnect(struct iscsi_session *is) 476 { 477 478 /* 479 * XXX: We can't use locking here, because 480 * it's being called from various contexts. 481 * Hope it doesn't break anything. 482 */ 483 if (is->is_reconnecting) 484 return; 485 486 is->is_reconnecting = true; 487 cv_signal(&is->is_maintenance_cv); 488 } 489 490 static void 491 iscsi_session_terminate(struct iscsi_session *is) 492 { 493 if (is->is_terminating) 494 return; 495 496 is->is_terminating = true; 497 498 #if 0 499 iscsi_session_logout(is); 500 #endif 501 cv_signal(&is->is_maintenance_cv); 502 } 503 504 static void 505 iscsi_callout(void *context) 506 { 507 struct icl_pdu *request; 508 struct iscsi_bhs_nop_out *bhsno; 509 struct iscsi_session *is; 510 bool reconnect_needed = false; 511 512 is = context; 513 514 if (is->is_terminating) 515 return; 516 517 callout_schedule(&is->is_callout, 1 * hz); 518 519 ISCSI_SESSION_LOCK(is); 520 is->is_timeout++; 521 522 if (is->is_waiting_for_iscsid) { 523 if (is->is_timeout > iscsid_timeout) { 524 ISCSI_SESSION_WARN(is, "timed out waiting for iscsid(8) " 525 "for %d seconds; reconnecting", 526 is->is_timeout); 527 reconnect_needed = true; 528 } 529 goto out; 530 } 531 532 if (is->is_login_phase) { 533 if (is->is_timeout > login_timeout) { 534 ISCSI_SESSION_WARN(is, "login timed out after %d seconds; " 535 "reconnecting", is->is_timeout); 536 reconnect_needed = true; 537 } 538 goto out; 539 } 540 541 if (is->is_timeout >= ping_timeout) { 542 ISCSI_SESSION_WARN(is, "no ping reply (NOP-In) after %d seconds; " 543 "reconnecting", ping_timeout); 544 reconnect_needed = true; 545 goto out; 546 } 547 548 ISCSI_SESSION_UNLOCK(is); 549 550 /* 551 * If the ping was reset less than one second ago - which means 552 * that we've received some PDU during the last second - assume 553 * the traffic flows correctly and don't bother sending a NOP-Out. 554 * 555 * (It's 2 - one for one second, and one for incrementing is_timeout 556 * earlier in this routine.) 557 */ 558 if (is->is_timeout < 2) 559 return; 560 561 request = icl_pdu_new_bhs(is->is_conn, M_NOWAIT); 562 if (request == NULL) { 563 ISCSI_SESSION_WARN(is, "failed to allocate PDU"); 564 return; 565 } 566 bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs; 567 bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT | 568 ISCSI_BHS_OPCODE_IMMEDIATE; 569 bhsno->bhsno_flags = 0x80; 570 bhsno->bhsno_target_transfer_tag = 0xffffffff; 571 iscsi_pdu_queue(request); 572 return; 573 574 out: 575 ISCSI_SESSION_UNLOCK(is); 576 577 if (reconnect_needed) 578 iscsi_session_reconnect(is); 579 } 580 581 static void 582 iscsi_pdu_update_statsn(const struct icl_pdu *response) 583 { 584 const struct iscsi_bhs_data_in *bhsdi; 585 struct iscsi_session *is; 586 uint32_t expcmdsn, maxcmdsn; 587 588 is = PDU_SESSION(response); 589 590 ISCSI_SESSION_LOCK_ASSERT(is); 591 592 /* 593 * We're only using fields common for all the response 594 * (target -> initiator) PDUs. 595 */ 596 bhsdi = (const struct iscsi_bhs_data_in *)response->ip_bhs; 597 /* 598 * Ok, I lied. In case of Data-In, "The fields StatSN, Status, 599 * and Residual Count only have meaningful content if the S bit 600 * is set to 1", so we also need to check the bit specific for 601 * Data-In PDU. 602 */ 603 if (bhsdi->bhsdi_opcode != ISCSI_BHS_OPCODE_SCSI_DATA_IN || 604 (bhsdi->bhsdi_flags & BHSDI_FLAGS_S) != 0) { 605 if (ntohl(bhsdi->bhsdi_statsn) < is->is_statsn) { 606 ISCSI_SESSION_WARN(is, 607 "PDU StatSN %d >= session StatSN %d, opcode 0x%x", 608 is->is_statsn, ntohl(bhsdi->bhsdi_statsn), 609 bhsdi->bhsdi_opcode); 610 } 611 is->is_statsn = ntohl(bhsdi->bhsdi_statsn); 612 } 613 614 expcmdsn = ntohl(bhsdi->bhsdi_expcmdsn); 615 maxcmdsn = ntohl(bhsdi->bhsdi_maxcmdsn); 616 617 /* 618 * XXX: Compare using Serial Arithmetic Sense. 619 */ 620 if (maxcmdsn + 1 < expcmdsn) { 621 ISCSI_SESSION_DEBUG(is, "PDU MaxCmdSN %d + 1 < PDU ExpCmdSN %d; ignoring", 622 maxcmdsn, expcmdsn); 623 } else { 624 if (maxcmdsn > is->is_maxcmdsn) { 625 is->is_maxcmdsn = maxcmdsn; 626 627 /* 628 * Command window increased; kick the maintanance thread 629 * to send out postponed commands. 630 */ 631 if (!TAILQ_EMPTY(&is->is_postponed)) 632 cv_signal(&is->is_maintenance_cv); 633 } else if (maxcmdsn < is->is_maxcmdsn) { 634 ISCSI_SESSION_DEBUG(is, "PDU MaxCmdSN %d < session MaxCmdSN %d; ignoring", 635 maxcmdsn, is->is_maxcmdsn); 636 } 637 638 if (expcmdsn > is->is_expcmdsn) { 639 is->is_expcmdsn = expcmdsn; 640 } else if (expcmdsn < is->is_expcmdsn) { 641 ISCSI_SESSION_DEBUG(is, "PDU ExpCmdSN %d < session ExpCmdSN %d; ignoring", 642 expcmdsn, is->is_expcmdsn); 643 } 644 } 645 646 /* 647 * Every incoming PDU - not just NOP-In - resets the ping timer. 648 * The purpose of the timeout is to reset the connection when it stalls; 649 * we don't want this to happen when NOP-In or NOP-Out ends up delayed 650 * in some queue. 651 */ 652 is->is_timeout = 0; 653 } 654 655 static void 656 iscsi_receive_callback(struct icl_pdu *response) 657 { 658 struct iscsi_session *is; 659 660 is = PDU_SESSION(response); 661 662 ISCSI_SESSION_LOCK(is); 663 664 #ifdef ICL_KERNEL_PROXY 665 if (is->is_login_phase) { 666 if (is->is_login_pdu == NULL) 667 is->is_login_pdu = response; 668 else 669 icl_pdu_free(response); 670 ISCSI_SESSION_UNLOCK(is); 671 cv_signal(&is->is_login_cv); 672 return; 673 } 674 #endif 675 676 iscsi_pdu_update_statsn(response); 677 678 /* 679 * The handling routine is responsible for freeing the PDU 680 * when it's no longer needed. 681 */ 682 switch (response->ip_bhs->bhs_opcode) { 683 case ISCSI_BHS_OPCODE_NOP_IN: 684 iscsi_pdu_handle_nop_in(response); 685 break; 686 case ISCSI_BHS_OPCODE_SCSI_RESPONSE: 687 iscsi_pdu_handle_scsi_response(response); 688 break; 689 case ISCSI_BHS_OPCODE_SCSI_DATA_IN: 690 iscsi_pdu_handle_data_in(response); 691 break; 692 case ISCSI_BHS_OPCODE_LOGOUT_RESPONSE: 693 iscsi_pdu_handle_logout_response(response); 694 break; 695 case ISCSI_BHS_OPCODE_R2T: 696 iscsi_pdu_handle_r2t(response); 697 break; 698 case ISCSI_BHS_OPCODE_ASYNC_MESSAGE: 699 iscsi_pdu_handle_async_message(response); 700 break; 701 case ISCSI_BHS_OPCODE_REJECT: 702 iscsi_pdu_handle_reject(response); 703 break; 704 default: 705 ISCSI_SESSION_WARN(is, "received PDU with unsupported " 706 "opcode 0x%x; reconnecting", 707 response->ip_bhs->bhs_opcode); 708 iscsi_session_reconnect(is); 709 icl_pdu_free(response); 710 } 711 712 ISCSI_SESSION_UNLOCK(is); 713 } 714 715 static void 716 iscsi_error_callback(struct icl_conn *ic) 717 { 718 struct iscsi_session *is; 719 720 is = CONN_SESSION(ic); 721 722 ISCSI_SESSION_WARN(is, "connection error; reconnecting"); 723 iscsi_session_reconnect(is); 724 } 725 726 static void 727 iscsi_pdu_handle_nop_in(struct icl_pdu *response) 728 { 729 struct iscsi_bhs_nop_out *bhsno; 730 struct iscsi_bhs_nop_in *bhsni; 731 struct icl_pdu *request; 732 733 bhsni = (struct iscsi_bhs_nop_in *)response->ip_bhs; 734 735 if (bhsni->bhsni_target_transfer_tag == 0xffffffff) { 736 /* 737 * Nothing to do; iscsi_pdu_update_statsn() already 738 * zeroed the timeout. 739 */ 740 icl_pdu_free(response); 741 return; 742 } 743 744 request = icl_pdu_new_bhs(response->ip_conn, M_NOWAIT); 745 if (request == NULL) { 746 icl_pdu_free(response); 747 return; 748 } 749 bhsno = (struct iscsi_bhs_nop_out *)request->ip_bhs; 750 bhsno->bhsno_opcode = ISCSI_BHS_OPCODE_NOP_OUT | 751 ISCSI_BHS_OPCODE_IMMEDIATE; 752 bhsno->bhsno_flags = 0x80; 753 bhsno->bhsno_initiator_task_tag = 0xffffffff; /* XXX */ 754 bhsno->bhsno_target_transfer_tag = bhsni->bhsni_target_transfer_tag; 755 756 request->ip_data_len = response->ip_data_len; 757 request->ip_data_mbuf = response->ip_data_mbuf; 758 response->ip_data_len = 0; 759 response->ip_data_mbuf = NULL; 760 761 icl_pdu_free(response); 762 iscsi_pdu_queue_locked(request); 763 } 764 765 static void 766 iscsi_pdu_handle_scsi_response(struct icl_pdu *response) 767 { 768 struct iscsi_bhs_scsi_response *bhssr; 769 struct iscsi_outstanding *io; 770 struct iscsi_session *is; 771 struct ccb_scsiio *csio; 772 size_t data_segment_len; 773 uint16_t sense_len; 774 775 is = PDU_SESSION(response); 776 777 bhssr = (struct iscsi_bhs_scsi_response *)response->ip_bhs; 778 io = iscsi_outstanding_find(is, bhssr->bhssr_initiator_task_tag); 779 if (io == NULL) { 780 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhssr->bhssr_initiator_task_tag); 781 icl_pdu_free(response); 782 iscsi_session_reconnect(is); 783 return; 784 } 785 786 if (bhssr->bhssr_response != BHSSR_RESPONSE_COMMAND_COMPLETED) { 787 ISCSI_SESSION_WARN(is, "service response 0x%x", bhssr->bhssr_response); 788 if ((io->io_ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 789 xpt_freeze_devq(io->io_ccb->ccb_h.path, 1); 790 ISCSI_SESSION_DEBUG(is, "freezing devq"); 791 } 792 io->io_ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 793 } else if (bhssr->bhssr_status == 0) { 794 io->io_ccb->ccb_h.status = CAM_REQ_CMP; 795 } else { 796 if ((io->io_ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 797 xpt_freeze_devq(io->io_ccb->ccb_h.path, 1); 798 ISCSI_SESSION_DEBUG(is, "freezing devq"); 799 } 800 io->io_ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN; 801 io->io_ccb->csio.scsi_status = bhssr->bhssr_status; 802 } 803 804 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_OVERFLOW) { 805 ISCSI_SESSION_WARN(is, "target indicated residual overflow"); 806 icl_pdu_free(response); 807 iscsi_session_reconnect(is); 808 return; 809 } 810 811 csio = &io->io_ccb->csio; 812 813 data_segment_len = icl_pdu_data_segment_length(response); 814 if (data_segment_len > 0) { 815 if (data_segment_len < sizeof(sense_len)) { 816 ISCSI_SESSION_WARN(is, "truncated data segment (%zd bytes)", 817 data_segment_len); 818 if ((io->io_ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 819 xpt_freeze_devq(io->io_ccb->ccb_h.path, 1); 820 ISCSI_SESSION_DEBUG(is, "freezing devq"); 821 } 822 io->io_ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 823 goto out; 824 } 825 icl_pdu_get_data(response, 0, &sense_len, sizeof(sense_len)); 826 sense_len = ntohs(sense_len); 827 #if 0 828 ISCSI_SESSION_DEBUG(is, "sense_len %d, data len %zd", 829 sense_len, data_segment_len); 830 #endif 831 if (sizeof(sense_len) + sense_len > data_segment_len) { 832 ISCSI_SESSION_WARN(is, "truncated data segment " 833 "(%zd bytes, should be %zd)", 834 data_segment_len, sizeof(sense_len) + sense_len); 835 if ((io->io_ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 836 xpt_freeze_devq(io->io_ccb->ccb_h.path, 1); 837 ISCSI_SESSION_DEBUG(is, "freezing devq"); 838 } 839 io->io_ccb->ccb_h.status = CAM_REQ_CMP_ERR | CAM_DEV_QFRZN; 840 goto out; 841 } else if (sizeof(sense_len) + sense_len < data_segment_len) 842 ISCSI_SESSION_WARN(is, "oversize data segment " 843 "(%zd bytes, should be %zd)", 844 data_segment_len, sizeof(sense_len) + sense_len); 845 if (sense_len > csio->sense_len) { 846 ISCSI_SESSION_DEBUG(is, "truncating sense from %d to %d", 847 sense_len, csio->sense_len); 848 sense_len = csio->sense_len; 849 } 850 icl_pdu_get_data(response, sizeof(sense_len), &csio->sense_data, sense_len); 851 csio->sense_resid = csio->sense_len - sense_len; 852 io->io_ccb->ccb_h.status |= CAM_AUTOSNS_VALID; 853 } 854 855 out: 856 if (bhssr->bhssr_flags & BHSSR_FLAGS_RESIDUAL_UNDERFLOW) 857 csio->resid = ntohl(bhssr->bhssr_residual_count); 858 859 if ((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) { 860 KASSERT(io->io_received <= csio->dxfer_len, 861 ("io->io_received > csio->dxfer_len")); 862 if (io->io_received < csio->dxfer_len) { 863 if (csio->resid != csio->dxfer_len - io->io_received) { 864 ISCSI_SESSION_WARN(is, "underflow mismatch: " 865 "target indicates %d, we calculated %zd", 866 csio->resid, 867 csio->dxfer_len - io->io_received); 868 } 869 csio->resid = csio->dxfer_len - io->io_received; 870 } 871 } 872 873 xpt_done(io->io_ccb); 874 iscsi_outstanding_remove(is, io); 875 icl_pdu_free(response); 876 } 877 878 static void 879 iscsi_pdu_handle_data_in(struct icl_pdu *response) 880 { 881 struct iscsi_bhs_data_in *bhsdi; 882 struct iscsi_outstanding *io; 883 struct iscsi_session *is; 884 struct ccb_scsiio *csio; 885 size_t data_segment_len; 886 887 is = PDU_SESSION(response); 888 bhsdi = (struct iscsi_bhs_data_in *)response->ip_bhs; 889 io = iscsi_outstanding_find(is, bhsdi->bhsdi_initiator_task_tag); 890 if (io == NULL) { 891 ISCSI_SESSION_WARN(is, "bad itt 0x%x", bhsdi->bhsdi_initiator_task_tag); 892 icl_pdu_free(response); 893 iscsi_session_reconnect(is); 894 return; 895 } 896 897 data_segment_len = icl_pdu_data_segment_length(response); 898 if (data_segment_len == 0) { 899 /* 900 * "The sending of 0 length data segments should be avoided, 901 * but initiators and targets MUST be able to properly receive 902 * 0 length data segments." 903 */ 904 icl_pdu_free(response); 905 return; 906 } 907 908 /* 909 * We need to track this for security reasons - without it, malicious target 910 * could respond to SCSI READ without sending Data-In PDUs, which would result 911 * in read operation on the initiator side returning random kernel data. 912 */ 913 if (ntohl(bhsdi->bhsdi_buffer_offset) != io->io_received) { 914 ISCSI_SESSION_WARN(is, "data out of order; expected offset %zd, got %zd", 915 io->io_received, (size_t)ntohl(bhsdi->bhsdi_buffer_offset)); 916 icl_pdu_free(response); 917 iscsi_session_reconnect(is); 918 return; 919 } 920 921 csio = &io->io_ccb->csio; 922 923 if (ntohl(bhsdi->bhsdi_buffer_offset) + data_segment_len > 924 csio->dxfer_len) { 925 ISCSI_SESSION_WARN(is, "oversize data segment (%zd bytes " 926 "at offset %d, buffer is %d)", 927 data_segment_len, ntohl(bhsdi->bhsdi_buffer_offset), 928 csio->dxfer_len); 929 icl_pdu_free(response); 930 iscsi_session_reconnect(is); 931 return; 932 } 933 934 icl_pdu_get_data(response, 0, csio->data_ptr + ntohl(bhsdi->bhsdi_buffer_offset), data_segment_len); 935 io->io_received += data_segment_len; 936 937 /* 938 * XXX: Check DataSN. 939 * XXX: Check F. 940 */ 941 if (bhsdi->bhsdi_flags & BHSDI_FLAGS_S) { 942 //ISCSI_SESSION_DEBUG(is, "got S flag; status 0x%x", bhsdi->bhsdi_status); 943 if (bhsdi->bhsdi_status == 0) { 944 io->io_ccb->ccb_h.status = CAM_REQ_CMP; 945 } else { 946 if ((io->io_ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 947 xpt_freeze_devq(io->io_ccb->ccb_h.path, 1); 948 ISCSI_SESSION_DEBUG(is, "freezing devq"); 949 } 950 io->io_ccb->ccb_h.status = CAM_SCSI_STATUS_ERROR | CAM_DEV_QFRZN; 951 csio->scsi_status = bhsdi->bhsdi_status; 952 } 953 xpt_done(io->io_ccb); 954 iscsi_outstanding_remove(is, io); 955 } 956 957 icl_pdu_free(response); 958 } 959 960 static void 961 iscsi_pdu_handle_logout_response(struct icl_pdu *response) 962 { 963 964 ISCSI_SESSION_DEBUG(PDU_SESSION(response), "logout response"); 965 icl_pdu_free(response); 966 } 967 968 static void 969 iscsi_pdu_handle_r2t(struct icl_pdu *response) 970 { 971 struct icl_pdu *request; 972 struct iscsi_session *is; 973 struct iscsi_bhs_r2t *bhsr2t; 974 struct iscsi_bhs_data_out *bhsdo; 975 struct iscsi_outstanding *io; 976 struct ccb_scsiio *csio; 977 size_t off, len, total_len; 978 int error; 979 980 is = PDU_SESSION(response); 981 982 bhsr2t = (struct iscsi_bhs_r2t *)response->ip_bhs; 983 io = iscsi_outstanding_find(is, bhsr2t->bhsr2t_initiator_task_tag); 984 if (io == NULL) { 985 ISCSI_SESSION_WARN(is, "bad itt 0x%x; reconnecting", 986 bhsr2t->bhsr2t_initiator_task_tag); 987 icl_pdu_free(response); 988 iscsi_session_reconnect(is); 989 return; 990 } 991 992 csio = &io->io_ccb->csio; 993 994 if ((csio->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_OUT) { 995 ISCSI_SESSION_WARN(is, "received R2T for read command; reconnecting"); 996 icl_pdu_free(response); 997 iscsi_session_reconnect(is); 998 return; 999 } 1000 1001 /* 1002 * XXX: Verify R2TSN. 1003 */ 1004 1005 io->io_datasn = 0; 1006 off = ntohl(bhsr2t->bhsr2t_buffer_offset); 1007 total_len = ntohl(bhsr2t->bhsr2t_desired_data_transfer_length); 1008 1009 //ISCSI_SESSION_DEBUG(is, "r2t; off %zd, len %zd", off, total_len); 1010 1011 for (;;) { 1012 len = total_len; 1013 1014 if (len > is->is_max_data_segment_length) 1015 len = is->is_max_data_segment_length; 1016 1017 if (off + len > csio->dxfer_len) { 1018 ISCSI_SESSION_WARN(is, "bad off %zd, len %d", 1019 off + len, csio->dxfer_len); 1020 icl_pdu_free(response); 1021 iscsi_session_reconnect(is); 1022 return; 1023 } 1024 1025 request = icl_pdu_new_bhs(response->ip_conn, M_NOWAIT); 1026 if (request == NULL) { 1027 icl_pdu_free(response); 1028 iscsi_session_reconnect(is); 1029 return; 1030 } 1031 1032 bhsdo = (struct iscsi_bhs_data_out *)request->ip_bhs; 1033 bhsdo->bhsdo_opcode = ISCSI_BHS_OPCODE_SCSI_DATA_OUT; 1034 bhsdo->bhsdo_lun = bhsr2t->bhsr2t_lun; 1035 bhsdo->bhsdo_initiator_task_tag = 1036 bhsr2t->bhsr2t_initiator_task_tag; 1037 bhsdo->bhsdo_target_transfer_tag = 1038 bhsr2t->bhsr2t_target_transfer_tag; 1039 bhsdo->bhsdo_datasn = htonl(io->io_datasn++); 1040 bhsdo->bhsdo_buffer_offset = htonl(off); 1041 error = icl_pdu_append_data(request, csio->data_ptr + off, len, M_NOWAIT); 1042 if (error != 0) { 1043 icl_pdu_free(request); 1044 icl_pdu_free(response); 1045 iscsi_session_reconnect(is); 1046 return; 1047 } 1048 1049 off += len; 1050 total_len -= len; 1051 1052 if (total_len == 0) { 1053 bhsdo->bhsdo_flags |= BHSDO_FLAGS_F; 1054 //ISCSI_SESSION_DEBUG(is, "setting F, off %zd", off); 1055 } else { 1056 //ISCSI_SESSION_DEBUG(is, "not finished, off %zd", off); 1057 } 1058 1059 iscsi_pdu_queue_locked(request); 1060 1061 if (total_len == 0) 1062 break; 1063 } 1064 1065 icl_pdu_free(response); 1066 } 1067 1068 static void 1069 iscsi_pdu_handle_async_message(struct icl_pdu *response) 1070 { 1071 struct iscsi_bhs_asynchronous_message *bhsam; 1072 struct iscsi_session *is; 1073 1074 is = PDU_SESSION(response); 1075 bhsam = (struct iscsi_bhs_asynchronous_message *)response->ip_bhs; 1076 switch (bhsam->bhsam_async_event) { 1077 case BHSAM_EVENT_TARGET_REQUESTS_LOGOUT: 1078 ISCSI_SESSION_WARN(is, "target requests logout; removing session"); 1079 iscsi_session_logout(is); 1080 iscsi_session_terminate(is); 1081 break; 1082 case BHSAM_EVENT_TARGET_TERMINATES_CONNECTION: 1083 ISCSI_SESSION_WARN(is, "target indicates it will drop drop the connection"); 1084 break; 1085 case BHSAM_EVENT_TARGET_TERMINATES_SESSION: 1086 ISCSI_SESSION_WARN(is, "target indicates it will drop drop the session"); 1087 break; 1088 default: 1089 /* 1090 * XXX: Technically, we're obligated to also handle 1091 * parameter renegotiation. 1092 */ 1093 ISCSI_SESSION_WARN(is, "ignoring AsyncEvent %d", bhsam->bhsam_async_event); 1094 break; 1095 } 1096 1097 icl_pdu_free(response); 1098 } 1099 1100 static void 1101 iscsi_pdu_handle_reject(struct icl_pdu *response) 1102 { 1103 struct iscsi_bhs_reject *bhsr; 1104 struct iscsi_session *is; 1105 1106 is = PDU_SESSION(response); 1107 bhsr = (struct iscsi_bhs_reject *)response->ip_bhs; 1108 ISCSI_SESSION_WARN(is, "received Reject PDU, reason 0x%x; protocol error?", 1109 bhsr->bhsr_reason); 1110 1111 icl_pdu_free(response); 1112 } 1113 1114 static int 1115 iscsi_ioctl_daemon_wait(struct iscsi_softc *sc, 1116 struct iscsi_daemon_request *request) 1117 { 1118 struct iscsi_session *is; 1119 int error; 1120 1121 sx_slock(&sc->sc_lock); 1122 for (;;) { 1123 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1124 if (is->is_waiting_for_iscsid) 1125 break; 1126 } 1127 1128 if (is == NULL) { 1129 /* 1130 * No session requires attention from iscsid(8); wait. 1131 */ 1132 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 1133 if (error != 0) { 1134 sx_sunlock(&sc->sc_lock); 1135 return (error); 1136 } 1137 continue; 1138 } 1139 1140 ISCSI_SESSION_LOCK(is); 1141 is->is_waiting_for_iscsid = false; 1142 is->is_login_phase = true; 1143 is->is_reason[0] = '\0'; 1144 ISCSI_SESSION_UNLOCK(is); 1145 1146 request->idr_session_id = is->is_id; 1147 memcpy(&request->idr_conf, &is->is_conf, 1148 sizeof(request->idr_conf)); 1149 1150 sx_sunlock(&sc->sc_lock); 1151 return (0); 1152 } 1153 } 1154 1155 static int 1156 iscsi_ioctl_daemon_handoff(struct iscsi_softc *sc, 1157 struct iscsi_daemon_handoff *handoff) 1158 { 1159 struct iscsi_session *is; 1160 int error; 1161 1162 sx_slock(&sc->sc_lock); 1163 1164 /* 1165 * Find the session to hand off socket to. 1166 */ 1167 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1168 if (is->is_id == handoff->idh_session_id) 1169 break; 1170 } 1171 if (is == NULL) { 1172 sx_sunlock(&sc->sc_lock); 1173 return (ESRCH); 1174 } 1175 ISCSI_SESSION_LOCK(is); 1176 if (is->is_conf.isc_discovery || is->is_terminating) { 1177 ISCSI_SESSION_UNLOCK(is); 1178 sx_sunlock(&sc->sc_lock); 1179 return (EINVAL); 1180 } 1181 1182 strlcpy(is->is_target_alias, handoff->idh_target_alias, 1183 sizeof(is->is_target_alias)); 1184 memcpy(is->is_isid, handoff->idh_isid, sizeof(is->is_isid)); 1185 is->is_statsn = handoff->idh_statsn; 1186 is->is_initial_r2t = handoff->idh_initial_r2t; 1187 is->is_immediate_data = handoff->idh_immediate_data; 1188 is->is_max_data_segment_length = handoff->idh_max_data_segment_length; 1189 is->is_max_burst_length = handoff->idh_max_burst_length; 1190 is->is_first_burst_length = handoff->idh_first_burst_length; 1191 1192 if (handoff->idh_header_digest == ISCSI_DIGEST_CRC32C) 1193 is->is_conn->ic_header_crc32c = true; 1194 else 1195 is->is_conn->ic_header_crc32c = false; 1196 if (handoff->idh_data_digest == ISCSI_DIGEST_CRC32C) 1197 is->is_conn->ic_data_crc32c = true; 1198 else 1199 is->is_conn->ic_data_crc32c = false; 1200 1201 is->is_cmdsn = 0; 1202 is->is_expcmdsn = 1; 1203 is->is_maxcmdsn = 1; 1204 is->is_waiting_for_iscsid = false; 1205 is->is_login_phase = false; 1206 is->is_timeout = 0; 1207 is->is_connected = true; 1208 is->is_reason[0] = '\0'; 1209 1210 ISCSI_SESSION_UNLOCK(is); 1211 1212 #ifndef ICL_KERNEL_PROXY 1213 error = icl_conn_handoff(is->is_conn, handoff->idh_socket); 1214 if (error != 0) { 1215 sx_sunlock(&sc->sc_lock); 1216 iscsi_session_terminate(is); 1217 return (error); 1218 } 1219 #endif 1220 1221 sx_sunlock(&sc->sc_lock); 1222 1223 if (is->is_sim != NULL) { 1224 /* 1225 * When reconnecting, there already is SIM allocated for the session. 1226 */ 1227 KASSERT(is->is_simq_frozen, ("reconnect without frozen simq")); 1228 ISCSI_SESSION_LOCK(is); 1229 ISCSI_SESSION_DEBUG(is, "releasing"); 1230 xpt_release_simq(is->is_sim, 1); 1231 is->is_simq_frozen = false; 1232 ISCSI_SESSION_UNLOCK(is); 1233 1234 } else { 1235 ISCSI_SESSION_LOCK(is); 1236 is->is_devq = cam_simq_alloc(maxtags); 1237 if (is->is_devq == NULL) { 1238 ISCSI_SESSION_WARN(is, "failed to allocate simq"); 1239 iscsi_session_terminate(is); 1240 return (ENOMEM); 1241 } 1242 1243 is->is_sim = cam_sim_alloc(iscsi_action, iscsi_poll, "iscsi", 1244 is, is->is_id /* unit */, &is->is_lock, 1245 maxtags, maxtags, is->is_devq); 1246 if (is->is_sim == NULL) { 1247 ISCSI_SESSION_UNLOCK(is); 1248 ISCSI_SESSION_WARN(is, "failed to allocate SIM"); 1249 cam_simq_free(is->is_devq); 1250 iscsi_session_terminate(is); 1251 return (ENOMEM); 1252 } 1253 1254 error = xpt_bus_register(is->is_sim, NULL, 0); 1255 if (error != 0) { 1256 ISCSI_SESSION_UNLOCK(is); 1257 ISCSI_SESSION_WARN(is, "failed to register bus"); 1258 iscsi_session_terminate(is); 1259 return (ENOMEM); 1260 } 1261 1262 error = xpt_create_path(&is->is_path, /*periph*/NULL, 1263 cam_sim_path(is->is_sim), CAM_TARGET_WILDCARD, 1264 CAM_LUN_WILDCARD); 1265 if (error != CAM_REQ_CMP) { 1266 ISCSI_SESSION_UNLOCK(is); 1267 ISCSI_SESSION_WARN(is, "failed to create path"); 1268 iscsi_session_terminate(is); 1269 return (ENOMEM); 1270 } 1271 ISCSI_SESSION_UNLOCK(is); 1272 } 1273 1274 return (0); 1275 } 1276 1277 static int 1278 iscsi_ioctl_daemon_fail(struct iscsi_softc *sc, 1279 struct iscsi_daemon_fail *fail) 1280 { 1281 struct iscsi_session *is; 1282 1283 sx_slock(&sc->sc_lock); 1284 1285 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1286 if (is->is_id == fail->idf_session_id) 1287 break; 1288 } 1289 if (is == NULL) { 1290 sx_sunlock(&sc->sc_lock); 1291 return (ESRCH); 1292 } 1293 ISCSI_SESSION_LOCK(is); 1294 ISCSI_SESSION_DEBUG(is, "iscsid(8) failed: %s", 1295 fail->idf_reason); 1296 strlcpy(is->is_reason, fail->idf_reason, sizeof(is->is_reason)); 1297 //is->is_waiting_for_iscsid = false; 1298 //is->is_login_phase = true; 1299 //iscsi_session_reconnect(is); 1300 ISCSI_SESSION_UNLOCK(is); 1301 sx_sunlock(&sc->sc_lock); 1302 1303 return (0); 1304 } 1305 1306 #ifdef ICL_KERNEL_PROXY 1307 static int 1308 iscsi_ioctl_daemon_connect(struct iscsi_softc *sc, 1309 struct iscsi_daemon_connect *idc) 1310 { 1311 struct iscsi_session *is; 1312 struct sockaddr *from_sa, *to_sa; 1313 int error; 1314 1315 sx_slock(&sc->sc_lock); 1316 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1317 if (is->is_id == idc->idc_session_id) 1318 break; 1319 } 1320 if (is == NULL) { 1321 sx_sunlock(&sc->sc_lock); 1322 return (ESRCH); 1323 } 1324 sx_sunlock(&sc->sc_lock); 1325 1326 if (idc->idc_from_addrlen > 0) { 1327 error = getsockaddr(&from_sa, (void *)idc->idc_from_addr, idc->idc_from_addrlen); 1328 if (error != 0) 1329 return (error); 1330 } else { 1331 from_sa = NULL; 1332 } 1333 error = getsockaddr(&to_sa, (void *)idc->idc_to_addr, idc->idc_to_addrlen); 1334 if (error != 0) { 1335 free(from_sa, M_SONAME); 1336 return (error); 1337 } 1338 1339 ISCSI_SESSION_LOCK(is); 1340 is->is_waiting_for_iscsid = false; 1341 is->is_login_phase = true; 1342 is->is_timeout = 0; 1343 ISCSI_SESSION_UNLOCK(is); 1344 1345 error = icl_conn_connect(is->is_conn, idc->idc_iser, idc->idc_domain, 1346 idc->idc_socktype, idc->idc_protocol, from_sa, to_sa); 1347 free(from_sa, M_SONAME); 1348 free(to_sa, M_SONAME); 1349 1350 /* 1351 * Digests are always disabled during login phase. 1352 */ 1353 is->is_conn->ic_header_crc32c = false; 1354 is->is_conn->ic_data_crc32c = false; 1355 1356 return (error); 1357 } 1358 1359 static int 1360 iscsi_ioctl_daemon_send(struct iscsi_softc *sc, 1361 struct iscsi_daemon_send *ids) 1362 { 1363 struct iscsi_session *is; 1364 struct icl_pdu *ip; 1365 size_t datalen; 1366 void *data; 1367 int error; 1368 1369 sx_slock(&sc->sc_lock); 1370 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1371 if (is->is_id == ids->ids_session_id) 1372 break; 1373 } 1374 if (is == NULL) { 1375 sx_sunlock(&sc->sc_lock); 1376 return (ESRCH); 1377 } 1378 sx_sunlock(&sc->sc_lock); 1379 1380 if (is->is_login_phase == false) 1381 return (EBUSY); 1382 1383 if (is->is_terminating || is->is_reconnecting) 1384 return (EIO); 1385 1386 datalen = ids->ids_data_segment_len; 1387 if (datalen > ISCSI_MAX_DATA_SEGMENT_LENGTH) 1388 return (EINVAL); 1389 if (datalen > 0) { 1390 data = malloc(datalen, M_ISCSI, M_WAITOK); 1391 error = copyin(ids->ids_data_segment, data, datalen); 1392 if (error != 0) { 1393 free(data, M_ISCSI); 1394 return (error); 1395 } 1396 } 1397 1398 ip = icl_pdu_new_bhs(is->is_conn, M_WAITOK); 1399 memcpy(ip->ip_bhs, ids->ids_bhs, sizeof(*ip->ip_bhs)); 1400 if (datalen > 0) { 1401 error = icl_pdu_append_data(ip, data, datalen, M_WAITOK); 1402 KASSERT(error == 0, ("icl_pdu_append_data(..., M_WAITOK) failed")); 1403 free(data, M_ISCSI); 1404 } 1405 icl_pdu_queue(ip); 1406 1407 return (0); 1408 } 1409 1410 static int 1411 iscsi_ioctl_daemon_receive(struct iscsi_softc *sc, 1412 struct iscsi_daemon_receive *idr) 1413 { 1414 struct iscsi_session *is; 1415 struct icl_pdu *ip; 1416 void *data; 1417 1418 sx_slock(&sc->sc_lock); 1419 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1420 if (is->is_id == idr->idr_session_id) 1421 break; 1422 } 1423 if (is == NULL) { 1424 sx_sunlock(&sc->sc_lock); 1425 return (ESRCH); 1426 } 1427 sx_sunlock(&sc->sc_lock); 1428 1429 if (is->is_login_phase == false) 1430 return (EBUSY); 1431 1432 ISCSI_SESSION_LOCK(is); 1433 while (is->is_login_pdu == NULL && 1434 is->is_terminating == false && 1435 is->is_reconnecting == false) 1436 cv_wait(&is->is_login_cv, &is->is_lock); 1437 if (is->is_terminating || is->is_reconnecting) { 1438 ISCSI_SESSION_UNLOCK(is); 1439 return (EIO); 1440 } 1441 ip = is->is_login_pdu; 1442 is->is_login_pdu = NULL; 1443 ISCSI_SESSION_UNLOCK(is); 1444 1445 if (ip->ip_data_len > idr->idr_data_segment_len) { 1446 icl_pdu_free(ip); 1447 return (EMSGSIZE); 1448 } 1449 1450 copyout(ip->ip_bhs, idr->idr_bhs, sizeof(*ip->ip_bhs)); 1451 if (ip->ip_data_len > 0) { 1452 data = malloc(ip->ip_data_len, M_ISCSI, M_WAITOK); 1453 icl_pdu_get_data(ip, 0, data, ip->ip_data_len); 1454 copyout(data, idr->idr_data_segment, ip->ip_data_len); 1455 free(data, M_ISCSI); 1456 } 1457 1458 icl_pdu_free(ip); 1459 1460 return (0); 1461 } 1462 1463 static int 1464 iscsi_ioctl_daemon_close(struct iscsi_softc *sc, 1465 struct iscsi_daemon_close *idc) 1466 { 1467 struct iscsi_session *is; 1468 1469 sx_slock(&sc->sc_lock); 1470 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1471 if (is->is_id == idc->idc_session_id) 1472 break; 1473 } 1474 if (is == NULL) { 1475 sx_sunlock(&sc->sc_lock); 1476 return (ESRCH); 1477 } 1478 sx_sunlock(&sc->sc_lock); 1479 1480 iscsi_session_reconnect(is); 1481 1482 return (0); 1483 } 1484 #endif /* ICL_KERNEL_PROXY */ 1485 1486 static void 1487 iscsi_sanitize_session_conf(struct iscsi_session_conf *isc) 1488 { 1489 /* 1490 * Just make sure all the fields are null-terminated. 1491 * 1492 * XXX: This is not particularly secure. We should 1493 * create our own conf and then copy in relevant 1494 * fields. 1495 */ 1496 isc->isc_initiator[ISCSI_NAME_LEN - 1] = '\0'; 1497 isc->isc_initiator_addr[ISCSI_ADDR_LEN - 1] = '\0'; 1498 isc->isc_initiator_alias[ISCSI_ALIAS_LEN - 1] = '\0'; 1499 isc->isc_target[ISCSI_NAME_LEN - 1] = '\0'; 1500 isc->isc_target_addr[ISCSI_ADDR_LEN - 1] = '\0'; 1501 isc->isc_user[ISCSI_NAME_LEN - 1] = '\0'; 1502 isc->isc_secret[ISCSI_SECRET_LEN - 1] = '\0'; 1503 isc->isc_mutual_user[ISCSI_NAME_LEN - 1] = '\0'; 1504 isc->isc_mutual_secret[ISCSI_SECRET_LEN - 1] = '\0'; 1505 } 1506 1507 static int 1508 iscsi_ioctl_session_add(struct iscsi_softc *sc, struct iscsi_session_add *isa) 1509 { 1510 struct iscsi_session *is; 1511 const struct iscsi_session *is2; 1512 int error; 1513 1514 iscsi_sanitize_session_conf(&isa->isa_conf); 1515 1516 is = malloc(sizeof(*is), M_ISCSI, M_ZERO | M_WAITOK); 1517 memcpy(&is->is_conf, &isa->isa_conf, sizeof(is->is_conf)); 1518 1519 if (is->is_conf.isc_initiator[0] == '\0' || 1520 is->is_conf.isc_target_addr[0] == '\0') { 1521 free(is, M_ISCSI); 1522 return (EINVAL); 1523 } 1524 1525 if ((is->is_conf.isc_discovery != 0 && is->is_conf.isc_target[0] != 0) || 1526 (is->is_conf.isc_discovery == 0 && is->is_conf.isc_target[0] == 0)) { 1527 free(is, M_ISCSI); 1528 return (EINVAL); 1529 } 1530 1531 sx_xlock(&sc->sc_lock); 1532 1533 /* 1534 * Prevent duplicates. 1535 */ 1536 TAILQ_FOREACH(is2, &sc->sc_sessions, is_next) { 1537 if (!!is->is_conf.isc_discovery != 1538 !!is2->is_conf.isc_discovery) 1539 continue; 1540 1541 if (strcmp(is->is_conf.isc_target_addr, 1542 is2->is_conf.isc_target_addr) != 0) 1543 continue; 1544 1545 if (is->is_conf.isc_discovery == 0 && 1546 strcmp(is->is_conf.isc_target, 1547 is2->is_conf.isc_target) != 0) 1548 continue; 1549 1550 sx_xunlock(&sc->sc_lock); 1551 free(is, M_ISCSI); 1552 return (EBUSY); 1553 } 1554 1555 is->is_conn = icl_conn_new(); 1556 is->is_conn->ic_receive = iscsi_receive_callback; 1557 is->is_conn->ic_error = iscsi_error_callback; 1558 is->is_conn->ic_prv0 = is; 1559 TAILQ_INIT(&is->is_outstanding); 1560 TAILQ_INIT(&is->is_postponed); 1561 mtx_init(&is->is_lock, "iscsi_lock", NULL, MTX_DEF); 1562 cv_init(&is->is_maintenance_cv, "iscsi_mt"); 1563 #ifdef ICL_KERNEL_PROXY 1564 cv_init(&is->is_login_cv, "iscsi_login"); 1565 #endif 1566 1567 is->is_softc = sc; 1568 sc->sc_last_session_id++; 1569 is->is_id = sc->sc_last_session_id; 1570 callout_init(&is->is_callout, 1); 1571 callout_reset(&is->is_callout, 1 * hz, iscsi_callout, is); 1572 TAILQ_INSERT_TAIL(&sc->sc_sessions, is, is_next); 1573 1574 error = kthread_add(iscsi_maintenance_thread, is, NULL, NULL, 0, 0, "iscsimt"); 1575 if (error != 0) { 1576 ISCSI_SESSION_WARN(is, "kthread_add(9) failed with error %d", error); 1577 return (error); 1578 } 1579 1580 /* 1581 * Trigger immediate reconnection. 1582 */ 1583 is->is_waiting_for_iscsid = true; 1584 strlcpy(is->is_reason, "Waiting for iscsid(8)", sizeof(is->is_reason)); 1585 cv_signal(&sc->sc_cv); 1586 1587 sx_xunlock(&sc->sc_lock); 1588 1589 return (0); 1590 } 1591 1592 static bool 1593 iscsi_session_conf_matches(unsigned int id1, const struct iscsi_session_conf *c1, 1594 unsigned int id2, const struct iscsi_session_conf *c2) 1595 { 1596 if (id2 == 0 && c2->isc_target[0] == '\0' && 1597 c2->isc_target_addr[0] == '\0') 1598 return (true); 1599 if (id2 != 0 && id2 == id1) 1600 return (true); 1601 if (c2->isc_target[0] != '\0' && 1602 strcmp(c1->isc_target, c2->isc_target) == 0) 1603 return (true); 1604 if (c2->isc_target_addr[0] != '\0' && 1605 strcmp(c1->isc_target_addr, c2->isc_target_addr) == 0) 1606 return (true); 1607 return (false); 1608 } 1609 1610 static int 1611 iscsi_ioctl_session_remove(struct iscsi_softc *sc, 1612 struct iscsi_session_remove *isr) 1613 { 1614 struct iscsi_session *is, *tmp; 1615 bool found = false; 1616 1617 iscsi_sanitize_session_conf(&isr->isr_conf); 1618 1619 sx_xlock(&sc->sc_lock); 1620 TAILQ_FOREACH_SAFE(is, &sc->sc_sessions, is_next, tmp) { 1621 ISCSI_SESSION_LOCK(is); 1622 if (iscsi_session_conf_matches(is->is_id, &is->is_conf, 1623 isr->isr_session_id, &isr->isr_conf)) { 1624 found = true; 1625 iscsi_session_logout(is); 1626 iscsi_session_terminate(is); 1627 } 1628 ISCSI_SESSION_UNLOCK(is); 1629 } 1630 sx_xunlock(&sc->sc_lock); 1631 1632 if (!found) 1633 return (ESRCH); 1634 1635 return (0); 1636 } 1637 1638 static int 1639 iscsi_ioctl_session_list(struct iscsi_softc *sc, struct iscsi_session_list *isl) 1640 { 1641 int error; 1642 unsigned int i = 0; 1643 struct iscsi_session *is; 1644 struct iscsi_session_state iss; 1645 1646 sx_slock(&sc->sc_lock); 1647 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) { 1648 if (i >= isl->isl_nentries) { 1649 sx_sunlock(&sc->sc_lock); 1650 return (EMSGSIZE); 1651 } 1652 memset(&iss, 0, sizeof(iss)); 1653 memcpy(&iss.iss_conf, &is->is_conf, sizeof(iss.iss_conf)); 1654 iss.iss_id = is->is_id; 1655 strlcpy(iss.iss_target_alias, is->is_target_alias, sizeof(iss.iss_target_alias)); 1656 strlcpy(iss.iss_reason, is->is_reason, sizeof(iss.iss_reason)); 1657 1658 if (is->is_conn->ic_header_crc32c) 1659 iss.iss_header_digest = ISCSI_DIGEST_CRC32C; 1660 else 1661 iss.iss_header_digest = ISCSI_DIGEST_NONE; 1662 1663 if (is->is_conn->ic_data_crc32c) 1664 iss.iss_data_digest = ISCSI_DIGEST_CRC32C; 1665 else 1666 iss.iss_data_digest = ISCSI_DIGEST_NONE; 1667 1668 iss.iss_max_data_segment_length = is->is_max_data_segment_length; 1669 iss.iss_immediate_data = is->is_immediate_data; 1670 iss.iss_connected = is->is_connected; 1671 1672 error = copyout(&iss, isl->isl_pstates + i, sizeof(iss)); 1673 if (error != 0) { 1674 sx_sunlock(&sc->sc_lock); 1675 return (error); 1676 } 1677 i++; 1678 } 1679 sx_sunlock(&sc->sc_lock); 1680 1681 isl->isl_nentries = i; 1682 1683 return (0); 1684 } 1685 1686 static int 1687 iscsi_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode, 1688 struct thread *td) 1689 { 1690 struct iscsi_softc *sc; 1691 1692 sc = dev->si_drv1; 1693 1694 switch (cmd) { 1695 case ISCSIDWAIT: 1696 return (iscsi_ioctl_daemon_wait(sc, 1697 (struct iscsi_daemon_request *)arg)); 1698 case ISCSIDHANDOFF: 1699 return (iscsi_ioctl_daemon_handoff(sc, 1700 (struct iscsi_daemon_handoff *)arg)); 1701 case ISCSIDFAIL: 1702 return (iscsi_ioctl_daemon_fail(sc, 1703 (struct iscsi_daemon_fail *)arg)); 1704 #ifdef ICL_KERNEL_PROXY 1705 case ISCSIDCONNECT: 1706 return (iscsi_ioctl_daemon_connect(sc, 1707 (struct iscsi_daemon_connect *)arg)); 1708 case ISCSIDSEND: 1709 return (iscsi_ioctl_daemon_send(sc, 1710 (struct iscsi_daemon_send *)arg)); 1711 case ISCSIDRECEIVE: 1712 return (iscsi_ioctl_daemon_receive(sc, 1713 (struct iscsi_daemon_receive *)arg)); 1714 case ISCSIDCLOSE: 1715 return (iscsi_ioctl_daemon_close(sc, 1716 (struct iscsi_daemon_close *)arg)); 1717 #endif /* ICL_KERNEL_PROXY */ 1718 case ISCSISADD: 1719 return (iscsi_ioctl_session_add(sc, 1720 (struct iscsi_session_add *)arg)); 1721 case ISCSISREMOVE: 1722 return (iscsi_ioctl_session_remove(sc, 1723 (struct iscsi_session_remove *)arg)); 1724 case ISCSISLIST: 1725 return (iscsi_ioctl_session_list(sc, 1726 (struct iscsi_session_list *)arg)); 1727 default: 1728 return (EINVAL); 1729 } 1730 } 1731 1732 static uint64_t 1733 iscsi_encode_lun(uint32_t lun) 1734 { 1735 uint8_t encoded[8]; 1736 uint64_t result; 1737 1738 memset(encoded, 0, sizeof(encoded)); 1739 1740 if (lun < 256) { 1741 /* 1742 * Peripheral device addressing. 1743 */ 1744 encoded[1] = lun; 1745 } else if (lun < 16384) { 1746 /* 1747 * Flat space addressing. 1748 */ 1749 encoded[0] = 0x40; 1750 encoded[0] |= (lun >> 8) & 0x3f; 1751 encoded[1] = lun & 0xff; 1752 } else { 1753 /* 1754 * Extended flat space addressing. 1755 */ 1756 encoded[0] = 0xd2; 1757 encoded[1] = lun >> 16; 1758 encoded[2] = lun >> 8; 1759 encoded[3] = lun; 1760 } 1761 1762 memcpy(&result, encoded, sizeof(result)); 1763 return (result); 1764 } 1765 1766 static struct iscsi_outstanding * 1767 iscsi_outstanding_find(struct iscsi_session *is, uint32_t initiator_task_tag) 1768 { 1769 struct iscsi_outstanding *io; 1770 1771 ISCSI_SESSION_LOCK_ASSERT(is); 1772 1773 TAILQ_FOREACH(io, &is->is_outstanding, io_next) { 1774 if (io->io_initiator_task_tag == initiator_task_tag) 1775 return (io); 1776 } 1777 return (NULL); 1778 } 1779 1780 static int 1781 iscsi_outstanding_add(struct iscsi_session *is, 1782 uint32_t initiator_task_tag, union ccb *ccb) 1783 { 1784 struct iscsi_outstanding *io; 1785 1786 ISCSI_SESSION_LOCK_ASSERT(is); 1787 1788 KASSERT(iscsi_outstanding_find(is, initiator_task_tag) == NULL, 1789 ("initiator_task_tag 0x%x already added", initiator_task_tag)); 1790 1791 io = uma_zalloc(iscsi_outstanding_zone, M_NOWAIT | M_ZERO); 1792 if (io == NULL) { 1793 ISCSI_SESSION_WARN(is, "failed to allocate %zd bytes", sizeof(*io)); 1794 return (ENOMEM); 1795 } 1796 io->io_initiator_task_tag = initiator_task_tag; 1797 io->io_ccb = ccb; 1798 TAILQ_INSERT_TAIL(&is->is_outstanding, io, io_next); 1799 return (0); 1800 } 1801 1802 static void 1803 iscsi_outstanding_remove(struct iscsi_session *is, struct iscsi_outstanding *io) 1804 { 1805 1806 ISCSI_SESSION_LOCK_ASSERT(is); 1807 1808 TAILQ_REMOVE(&is->is_outstanding, io, io_next); 1809 uma_zfree(iscsi_outstanding_zone, io); 1810 } 1811 1812 static void 1813 iscsi_action_scsiio(struct iscsi_session *is, union ccb *ccb) 1814 { 1815 struct icl_pdu *request; 1816 struct iscsi_bhs_scsi_command *bhssc; 1817 struct ccb_scsiio *csio; 1818 size_t len; 1819 int error; 1820 1821 ISCSI_SESSION_LOCK_ASSERT(is); 1822 1823 #if 0 1824 KASSERT(is->is_login_phase == false, ("%s called during Login Phase", __func__)); 1825 #else 1826 if (is->is_login_phase) { 1827 ISCSI_SESSION_DEBUG(is, "called during login phase"); 1828 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 1829 xpt_freeze_devq(ccb->ccb_h.path, 1); 1830 ISCSI_SESSION_DEBUG(is, "freezing devq"); 1831 } 1832 ccb->ccb_h.status = CAM_REQ_ABORTED | CAM_DEV_QFRZN; 1833 xpt_done(ccb); 1834 return; 1835 } 1836 #endif 1837 1838 request = icl_pdu_new_bhs(is->is_conn, M_NOWAIT); 1839 if (request == NULL) { 1840 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 1841 xpt_freeze_devq(ccb->ccb_h.path, 1); 1842 ISCSI_SESSION_DEBUG(is, "freezing devq"); 1843 } 1844 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 1845 xpt_done(ccb); 1846 return; 1847 } 1848 1849 csio = &ccb->csio; 1850 bhssc = (struct iscsi_bhs_scsi_command *)request->ip_bhs; 1851 bhssc->bhssc_opcode = ISCSI_BHS_OPCODE_SCSI_COMMAND; 1852 bhssc->bhssc_flags |= BHSSC_FLAGS_F; 1853 switch (csio->ccb_h.flags & CAM_DIR_MASK) { 1854 case CAM_DIR_IN: 1855 bhssc->bhssc_flags |= BHSSC_FLAGS_R; 1856 break; 1857 case CAM_DIR_OUT: 1858 bhssc->bhssc_flags |= BHSSC_FLAGS_W; 1859 break; 1860 } 1861 1862 switch (csio->tag_action) { 1863 case MSG_HEAD_OF_Q_TAG: 1864 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_HOQ; 1865 break; 1866 break; 1867 case MSG_ORDERED_Q_TAG: 1868 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ORDERED; 1869 break; 1870 case MSG_ACA_TASK: 1871 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_ACA; 1872 break; 1873 case CAM_TAG_ACTION_NONE: 1874 case MSG_SIMPLE_Q_TAG: 1875 default: 1876 bhssc->bhssc_flags |= BHSSC_FLAGS_ATTR_SIMPLE; 1877 break; 1878 } 1879 1880 bhssc->bhssc_lun = iscsi_encode_lun(csio->ccb_h.target_lun); 1881 bhssc->bhssc_initiator_task_tag = is->is_initiator_task_tag; 1882 is->is_initiator_task_tag++; 1883 bhssc->bhssc_expected_data_transfer_length = htonl(csio->dxfer_len); 1884 KASSERT(csio->cdb_len <= sizeof(bhssc->bhssc_cdb), 1885 ("unsupported CDB size %zd", (size_t)csio->cdb_len)); 1886 1887 if (csio->ccb_h.flags & CAM_CDB_POINTER) 1888 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_ptr, csio->cdb_len); 1889 else 1890 memcpy(&bhssc->bhssc_cdb, csio->cdb_io.cdb_bytes, csio->cdb_len); 1891 1892 error = iscsi_outstanding_add(is, bhssc->bhssc_initiator_task_tag, ccb); 1893 if (error != 0) { 1894 icl_pdu_free(request); 1895 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 1896 xpt_freeze_devq(ccb->ccb_h.path, 1); 1897 ISCSI_SESSION_DEBUG(is, "freezing devq"); 1898 } 1899 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 1900 xpt_done(ccb); 1901 return; 1902 } 1903 1904 if (is->is_immediate_data && 1905 (csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) { 1906 len = csio->dxfer_len; 1907 //ISCSI_SESSION_DEBUG(is, "adding %zd of immediate data", len); 1908 if (len > is->is_first_burst_length) { 1909 ISCSI_SESSION_DEBUG(is, "len %zd -> %zd", len, is->is_first_burst_length); 1910 len = is->is_first_burst_length; 1911 } 1912 1913 error = icl_pdu_append_data(request, csio->data_ptr, len, M_NOWAIT); 1914 if (error != 0) { 1915 icl_pdu_free(request); 1916 if ((ccb->ccb_h.status & CAM_DEV_QFRZN) == 0) { 1917 xpt_freeze_devq(ccb->ccb_h.path, 1); 1918 ISCSI_SESSION_DEBUG(is, "freezing devq"); 1919 } 1920 ccb->ccb_h.status = CAM_RESRC_UNAVAIL | CAM_DEV_QFRZN; 1921 xpt_done(ccb); 1922 return; 1923 } 1924 } 1925 iscsi_pdu_queue_locked(request); 1926 } 1927 1928 static void 1929 iscsi_action(struct cam_sim *sim, union ccb *ccb) 1930 { 1931 struct iscsi_session *is; 1932 1933 is = cam_sim_softc(sim); 1934 1935 ISCSI_SESSION_LOCK_ASSERT(is); 1936 1937 if (is->is_terminating) { 1938 ISCSI_SESSION_DEBUG(is, "called during termination"); 1939 ccb->ccb_h.status = CAM_DEV_NOT_THERE; 1940 xpt_done(ccb); 1941 return; 1942 } 1943 1944 switch (ccb->ccb_h.func_code) { 1945 case XPT_PATH_INQ: 1946 { 1947 struct ccb_pathinq *cpi = &ccb->cpi; 1948 1949 cpi->version_num = 1; 1950 cpi->hba_inquiry = PI_TAG_ABLE; 1951 cpi->target_sprt = 0; 1952 //cpi->hba_misc = PIM_NOBUSRESET; 1953 cpi->hba_misc = 0; 1954 cpi->hba_eng_cnt = 0; 1955 cpi->max_target = 0; 1956 cpi->max_lun = 255; 1957 //cpi->initiator_id = 0; /* XXX */ 1958 cpi->initiator_id = 64; /* XXX */ 1959 strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN); 1960 strlcpy(cpi->hba_vid, "iSCSI", HBA_IDLEN); 1961 strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN); 1962 cpi->unit_number = cam_sim_unit(sim); 1963 cpi->bus_id = cam_sim_bus(sim); 1964 cpi->base_transfer_speed = 150000; /* XXX */ 1965 cpi->transport = XPORT_ISCSI; 1966 cpi->transport_version = 0; 1967 cpi->protocol = PROTO_SCSI; 1968 cpi->protocol_version = SCSI_REV_SPC3; 1969 cpi->maxio = MAXPHYS; 1970 cpi->ccb_h.status = CAM_REQ_CMP; 1971 break; 1972 } 1973 case XPT_CALC_GEOMETRY: 1974 cam_calc_geometry(&ccb->ccg, /*extended*/1); 1975 ccb->ccb_h.status = CAM_REQ_CMP; 1976 break; 1977 #if 0 1978 /* 1979 * XXX: What's the point? 1980 */ 1981 case XPT_RESET_BUS: 1982 case XPT_ABORT: 1983 case XPT_TERM_IO: 1984 ISCSI_SESSION_DEBUG(is, "faking success for reset, abort, or term_io"); 1985 ccb->ccb_h.status = CAM_REQ_CMP; 1986 break; 1987 #endif 1988 case XPT_SCSI_IO: 1989 iscsi_action_scsiio(is, ccb); 1990 return; 1991 default: 1992 #if 0 1993 ISCSI_SESSION_DEBUG(is, "got unsupported code 0x%x", ccb->ccb_h.func_code); 1994 #endif 1995 ccb->ccb_h.status = CAM_FUNC_NOTAVAIL; 1996 break; 1997 } 1998 xpt_done(ccb); 1999 } 2000 2001 static void 2002 iscsi_poll(struct cam_sim *sim) 2003 { 2004 2005 KASSERT(0, ("%s: you're not supposed to be here", __func__)); 2006 } 2007 2008 static void 2009 iscsi_shutdown(struct iscsi_softc *sc) 2010 { 2011 struct iscsi_session *is; 2012 2013 ISCSI_DEBUG("removing all sessions due to shutdown"); 2014 2015 sx_slock(&sc->sc_lock); 2016 TAILQ_FOREACH(is, &sc->sc_sessions, is_next) 2017 iscsi_session_terminate(is); 2018 sx_sunlock(&sc->sc_lock); 2019 } 2020 2021 static int 2022 iscsi_load(void) 2023 { 2024 int error; 2025 2026 sc = malloc(sizeof(*sc), M_ISCSI, M_ZERO | M_WAITOK); 2027 sx_init(&sc->sc_lock, "iscsi"); 2028 TAILQ_INIT(&sc->sc_sessions); 2029 cv_init(&sc->sc_cv, "iscsi_cv"); 2030 2031 iscsi_outstanding_zone = uma_zcreate("iscsi_outstanding", 2032 sizeof(struct iscsi_outstanding), NULL, NULL, NULL, NULL, 2033 UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 2034 2035 error = make_dev_p(MAKEDEV_CHECKNAME, &sc->sc_cdev, &iscsi_cdevsw, 2036 NULL, UID_ROOT, GID_WHEEL, 0600, "iscsi"); 2037 if (error != 0) { 2038 ISCSI_WARN("failed to create device node, error %d", error); 2039 return (error); 2040 } 2041 sc->sc_cdev->si_drv1 = sc; 2042 2043 /* 2044 * XXX: For some reason this doesn't do its job; active sessions still hang out there 2045 * after final sync, making the reboot effectively hang. 2046 */ 2047 sc->sc_shutdown_eh = EVENTHANDLER_REGISTER(shutdown_post_sync, iscsi_shutdown, sc, SHUTDOWN_PRI_DEFAULT); 2048 2049 return (0); 2050 } 2051 2052 static int 2053 iscsi_unload(void) 2054 { 2055 struct iscsi_session *is, *tmp; 2056 2057 if (sc->sc_cdev != NULL) { 2058 ISCSI_DEBUG("removing device node"); 2059 destroy_dev(sc->sc_cdev); 2060 ISCSI_DEBUG("device node removed"); 2061 } 2062 2063 if (sc->sc_shutdown_eh != NULL) 2064 EVENTHANDLER_DEREGISTER(shutdown_post_sync, sc->sc_shutdown_eh); 2065 2066 sx_slock(&sc->sc_lock); 2067 TAILQ_FOREACH_SAFE(is, &sc->sc_sessions, is_next, tmp) 2068 iscsi_session_terminate(is); 2069 while(!TAILQ_EMPTY(&sc->sc_sessions)) { 2070 ISCSI_DEBUG("waiting for sessions to terminate"); 2071 cv_wait(&sc->sc_cv, &sc->sc_lock); 2072 } 2073 ISCSI_DEBUG("all sessions terminated"); 2074 sx_sunlock(&sc->sc_lock); 2075 2076 uma_zdestroy(iscsi_outstanding_zone); 2077 sx_destroy(&sc->sc_lock); 2078 cv_destroy(&sc->sc_cv); 2079 free(sc, M_ISCSI); 2080 return (0); 2081 } 2082 2083 static int 2084 iscsi_quiesce(void) 2085 { 2086 sx_slock(&sc->sc_lock); 2087 if (!TAILQ_EMPTY(&sc->sc_sessions)) { 2088 sx_sunlock(&sc->sc_lock); 2089 return (EBUSY); 2090 } 2091 sx_sunlock(&sc->sc_lock); 2092 return (0); 2093 } 2094 2095 static int 2096 iscsi_modevent(module_t mod, int what, void *arg) 2097 { 2098 int error; 2099 2100 switch (what) { 2101 case MOD_LOAD: 2102 error = iscsi_load(); 2103 break; 2104 case MOD_UNLOAD: 2105 error = iscsi_unload(); 2106 break; 2107 case MOD_QUIESCE: 2108 error = iscsi_quiesce(); 2109 break; 2110 default: 2111 error = EINVAL; 2112 break; 2113 } 2114 return (error); 2115 } 2116 2117 moduledata_t iscsi_data = { 2118 "iscsi", 2119 iscsi_modevent, 2120 0 2121 }; 2122 2123 DECLARE_MODULE(iscsi, iscsi_data, SI_SUB_DRIVERS, SI_ORDER_MIDDLE); 2124 MODULE_DEPEND(iscsi, cam, 1, 1, 1); 2125 MODULE_DEPEND(iscsi, icl, 1, 1, 1); 2126