1 /******************************************************************************* 2 * 3 * This file contains the Linux/SCSI LLD virtual SCSI initiator driver 4 * for emulated SAS initiator ports 5 * 6 * © Copyright 2011-2013 Datera, Inc. 7 * 8 * Licensed to the Linux Foundation under the General Public License (GPL) version 2. 9 * 10 * Author: Nicholas A. Bellinger <nab@risingtidesystems.com> 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 ****************************************************************************/ 22 23 #include <linux/module.h> 24 #include <linux/moduleparam.h> 25 #include <linux/init.h> 26 #include <linux/slab.h> 27 #include <linux/types.h> 28 #include <linux/configfs.h> 29 #include <scsi/scsi.h> 30 #include <scsi/scsi_tcq.h> 31 #include <scsi/scsi_host.h> 32 #include <scsi/scsi_device.h> 33 #include <scsi/scsi_cmnd.h> 34 35 #include <target/target_core_base.h> 36 #include <target/target_core_fabric.h> 37 38 #include "tcm_loop.h" 39 40 #define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev) 41 42 static struct workqueue_struct *tcm_loop_workqueue; 43 static struct kmem_cache *tcm_loop_cmd_cache; 44 45 static int tcm_loop_hba_no_cnt; 46 47 static int tcm_loop_queue_status(struct se_cmd *se_cmd); 48 49 /* 50 * Called from struct target_core_fabric_ops->check_stop_free() 51 */ 52 static int tcm_loop_check_stop_free(struct se_cmd *se_cmd) 53 { 54 /* 55 * Do not release struct se_cmd's containing a valid TMR 56 * pointer. These will be released directly in tcm_loop_device_reset() 57 * with transport_generic_free_cmd(). 58 */ 59 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 60 return 0; 61 /* 62 * Release the struct se_cmd, which will make a callback to release 63 * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd() 64 */ 65 transport_generic_free_cmd(se_cmd, 0); 66 return 1; 67 } 68 69 static void tcm_loop_release_cmd(struct se_cmd *se_cmd) 70 { 71 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 72 struct tcm_loop_cmd, tl_se_cmd); 73 74 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); 75 } 76 77 static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host) 78 { 79 seq_printf(m, "tcm_loop_proc_info()\n"); 80 return 0; 81 } 82 83 static int tcm_loop_driver_probe(struct device *); 84 static int tcm_loop_driver_remove(struct device *); 85 86 static int pseudo_lld_bus_match(struct device *dev, 87 struct device_driver *dev_driver) 88 { 89 return 1; 90 } 91 92 static struct bus_type tcm_loop_lld_bus = { 93 .name = "tcm_loop_bus", 94 .match = pseudo_lld_bus_match, 95 .probe = tcm_loop_driver_probe, 96 .remove = tcm_loop_driver_remove, 97 }; 98 99 static struct device_driver tcm_loop_driverfs = { 100 .name = "tcm_loop", 101 .bus = &tcm_loop_lld_bus, 102 }; 103 /* 104 * Used with root_device_register() in tcm_loop_alloc_core_bus() below 105 */ 106 static struct device *tcm_loop_primary; 107 108 static void tcm_loop_submission_work(struct work_struct *work) 109 { 110 struct tcm_loop_cmd *tl_cmd = 111 container_of(work, struct tcm_loop_cmd, work); 112 struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd; 113 struct scsi_cmnd *sc = tl_cmd->sc; 114 struct tcm_loop_nexus *tl_nexus; 115 struct tcm_loop_hba *tl_hba; 116 struct tcm_loop_tpg *tl_tpg; 117 struct scatterlist *sgl_bidi = NULL; 118 u32 sgl_bidi_count = 0, transfer_length; 119 int rc; 120 121 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 122 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 123 124 /* 125 * Ensure that this tl_tpg reference from the incoming sc->device->id 126 * has already been configured via tcm_loop_make_naa_tpg(). 127 */ 128 if (!tl_tpg->tl_hba) { 129 set_host_byte(sc, DID_NO_CONNECT); 130 goto out_done; 131 } 132 if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) { 133 set_host_byte(sc, DID_TRANSPORT_DISRUPTED); 134 goto out_done; 135 } 136 tl_nexus = tl_tpg->tl_nexus; 137 if (!tl_nexus) { 138 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus" 139 " does not exist\n"); 140 set_host_byte(sc, DID_ERROR); 141 goto out_done; 142 } 143 if (scsi_bidi_cmnd(sc)) { 144 struct scsi_data_buffer *sdb = scsi_in(sc); 145 146 sgl_bidi = sdb->table.sgl; 147 sgl_bidi_count = sdb->table.nents; 148 se_cmd->se_cmd_flags |= SCF_BIDI; 149 150 } 151 152 transfer_length = scsi_transfer_length(sc); 153 if (!scsi_prot_sg_count(sc) && 154 scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) { 155 se_cmd->prot_pto = true; 156 /* 157 * loopback transport doesn't support 158 * WRITE_GENERATE, READ_STRIP protection 159 * information operations, go ahead unprotected. 160 */ 161 transfer_length = scsi_bufflen(sc); 162 } 163 164 se_cmd->tag = tl_cmd->sc_cmd_tag; 165 rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd, 166 &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun, 167 transfer_length, TCM_SIMPLE_TAG, 168 sc->sc_data_direction, 0, 169 scsi_sglist(sc), scsi_sg_count(sc), 170 sgl_bidi, sgl_bidi_count, 171 scsi_prot_sglist(sc), scsi_prot_sg_count(sc)); 172 if (rc < 0) { 173 set_host_byte(sc, DID_NO_CONNECT); 174 goto out_done; 175 } 176 return; 177 178 out_done: 179 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); 180 sc->scsi_done(sc); 181 return; 182 } 183 184 /* 185 * ->queuecommand can be and usually is called from interrupt context, so 186 * defer the actual submission to a workqueue. 187 */ 188 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc) 189 { 190 struct tcm_loop_cmd *tl_cmd; 191 192 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%llu got CDB: 0x%02x" 193 " scsi_buf_len: %u\n", sc->device->host->host_no, 194 sc->device->id, sc->device->channel, sc->device->lun, 195 sc->cmnd[0], scsi_bufflen(sc)); 196 197 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC); 198 if (!tl_cmd) { 199 pr_err("Unable to allocate struct tcm_loop_cmd\n"); 200 set_host_byte(sc, DID_ERROR); 201 sc->scsi_done(sc); 202 return 0; 203 } 204 205 tl_cmd->sc = sc; 206 tl_cmd->sc_cmd_tag = sc->request->tag; 207 INIT_WORK(&tl_cmd->work, tcm_loop_submission_work); 208 queue_work(tcm_loop_workqueue, &tl_cmd->work); 209 return 0; 210 } 211 212 /* 213 * Called from SCSI EH process context to issue a LUN_RESET TMR 214 * to struct scsi_device 215 */ 216 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg, 217 u64 lun, int task, enum tcm_tmreq_table tmr) 218 { 219 struct se_cmd *se_cmd = NULL; 220 struct se_session *se_sess; 221 struct se_portal_group *se_tpg; 222 struct tcm_loop_nexus *tl_nexus; 223 struct tcm_loop_cmd *tl_cmd = NULL; 224 struct tcm_loop_tmr *tl_tmr = NULL; 225 int ret = TMR_FUNCTION_FAILED, rc; 226 227 /* 228 * Locate the tl_nexus and se_sess pointers 229 */ 230 tl_nexus = tl_tpg->tl_nexus; 231 if (!tl_nexus) { 232 pr_err("Unable to perform device reset without" 233 " active I_T Nexus\n"); 234 return ret; 235 } 236 237 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); 238 if (!tl_cmd) { 239 pr_err("Unable to allocate memory for tl_cmd\n"); 240 return ret; 241 } 242 243 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL); 244 if (!tl_tmr) { 245 pr_err("Unable to allocate memory for tl_tmr\n"); 246 goto release; 247 } 248 init_waitqueue_head(&tl_tmr->tl_tmr_wait); 249 250 se_cmd = &tl_cmd->tl_se_cmd; 251 se_tpg = &tl_tpg->tl_se_tpg; 252 se_sess = tl_tpg->tl_nexus->se_sess; 253 /* 254 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 255 */ 256 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0, 257 DMA_NONE, TCM_SIMPLE_TAG, 258 &tl_cmd->tl_sense_buf[0]); 259 260 rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL); 261 if (rc < 0) 262 goto release; 263 264 if (tmr == TMR_ABORT_TASK) 265 se_cmd->se_tmr_req->ref_task_tag = task; 266 267 /* 268 * Locate the underlying TCM struct se_lun 269 */ 270 if (transport_lookup_tmr_lun(se_cmd, lun) < 0) { 271 ret = TMR_LUN_DOES_NOT_EXIST; 272 goto release; 273 } 274 /* 275 * Queue the TMR to TCM Core and sleep waiting for 276 * tcm_loop_queue_tm_rsp() to wake us up. 277 */ 278 transport_generic_handle_tmr(se_cmd); 279 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete)); 280 /* 281 * The TMR LUN_RESET has completed, check the response status and 282 * then release allocations. 283 */ 284 ret = se_cmd->se_tmr_req->response; 285 release: 286 if (se_cmd) 287 transport_generic_free_cmd(se_cmd, 1); 288 else 289 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); 290 kfree(tl_tmr); 291 return ret; 292 } 293 294 static int tcm_loop_abort_task(struct scsi_cmnd *sc) 295 { 296 struct tcm_loop_hba *tl_hba; 297 struct tcm_loop_tpg *tl_tpg; 298 int ret = FAILED; 299 300 /* 301 * Locate the tcm_loop_hba_t pointer 302 */ 303 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 304 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 305 ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun, 306 sc->request->tag, TMR_ABORT_TASK); 307 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; 308 } 309 310 /* 311 * Called from SCSI EH process context to issue a LUN_RESET TMR 312 * to struct scsi_device 313 */ 314 static int tcm_loop_device_reset(struct scsi_cmnd *sc) 315 { 316 struct tcm_loop_hba *tl_hba; 317 struct tcm_loop_tpg *tl_tpg; 318 int ret = FAILED; 319 320 /* 321 * Locate the tcm_loop_hba_t pointer 322 */ 323 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 324 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 325 326 ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun, 327 0, TMR_LUN_RESET); 328 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; 329 } 330 331 static int tcm_loop_target_reset(struct scsi_cmnd *sc) 332 { 333 struct tcm_loop_hba *tl_hba; 334 struct tcm_loop_tpg *tl_tpg; 335 336 /* 337 * Locate the tcm_loop_hba_t pointer 338 */ 339 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 340 if (!tl_hba) { 341 pr_err("Unable to perform device reset without" 342 " active I_T Nexus\n"); 343 return FAILED; 344 } 345 /* 346 * Locate the tl_tpg pointer from TargetID in sc->device->id 347 */ 348 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 349 if (tl_tpg) { 350 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; 351 return SUCCESS; 352 } 353 return FAILED; 354 } 355 356 static int tcm_loop_slave_alloc(struct scsi_device *sd) 357 { 358 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags); 359 return 0; 360 } 361 362 static struct scsi_host_template tcm_loop_driver_template = { 363 .show_info = tcm_loop_show_info, 364 .proc_name = "tcm_loopback", 365 .name = "TCM_Loopback", 366 .queuecommand = tcm_loop_queuecommand, 367 .change_queue_depth = scsi_change_queue_depth, 368 .eh_abort_handler = tcm_loop_abort_task, 369 .eh_device_reset_handler = tcm_loop_device_reset, 370 .eh_target_reset_handler = tcm_loop_target_reset, 371 .can_queue = 1024, 372 .this_id = -1, 373 .sg_tablesize = 256, 374 .cmd_per_lun = 1024, 375 .max_sectors = 0xFFFF, 376 .use_clustering = DISABLE_CLUSTERING, 377 .slave_alloc = tcm_loop_slave_alloc, 378 .module = THIS_MODULE, 379 .track_queue_depth = 1, 380 }; 381 382 static int tcm_loop_driver_probe(struct device *dev) 383 { 384 struct tcm_loop_hba *tl_hba; 385 struct Scsi_Host *sh; 386 int error, host_prot; 387 388 tl_hba = to_tcm_loop_hba(dev); 389 390 sh = scsi_host_alloc(&tcm_loop_driver_template, 391 sizeof(struct tcm_loop_hba)); 392 if (!sh) { 393 pr_err("Unable to allocate struct scsi_host\n"); 394 return -ENODEV; 395 } 396 tl_hba->sh = sh; 397 398 /* 399 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata 400 */ 401 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba; 402 /* 403 * Setup single ID, Channel and LUN for now.. 404 */ 405 sh->max_id = 2; 406 sh->max_lun = 0; 407 sh->max_channel = 0; 408 sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; 409 410 host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | 411 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | 412 SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; 413 414 scsi_host_set_prot(sh, host_prot); 415 scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC); 416 417 error = scsi_add_host(sh, &tl_hba->dev); 418 if (error) { 419 pr_err("%s: scsi_add_host failed\n", __func__); 420 scsi_host_put(sh); 421 return -ENODEV; 422 } 423 return 0; 424 } 425 426 static int tcm_loop_driver_remove(struct device *dev) 427 { 428 struct tcm_loop_hba *tl_hba; 429 struct Scsi_Host *sh; 430 431 tl_hba = to_tcm_loop_hba(dev); 432 sh = tl_hba->sh; 433 434 scsi_remove_host(sh); 435 scsi_host_put(sh); 436 return 0; 437 } 438 439 static void tcm_loop_release_adapter(struct device *dev) 440 { 441 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev); 442 443 kfree(tl_hba); 444 } 445 446 /* 447 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c 448 */ 449 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id) 450 { 451 int ret; 452 453 tl_hba->dev.bus = &tcm_loop_lld_bus; 454 tl_hba->dev.parent = tcm_loop_primary; 455 tl_hba->dev.release = &tcm_loop_release_adapter; 456 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id); 457 458 ret = device_register(&tl_hba->dev); 459 if (ret) { 460 pr_err("device_register() failed for" 461 " tl_hba->dev: %d\n", ret); 462 return -ENODEV; 463 } 464 465 return 0; 466 } 467 468 /* 469 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated 470 * tcm_loop SCSI bus. 471 */ 472 static int tcm_loop_alloc_core_bus(void) 473 { 474 int ret; 475 476 tcm_loop_primary = root_device_register("tcm_loop_0"); 477 if (IS_ERR(tcm_loop_primary)) { 478 pr_err("Unable to allocate tcm_loop_primary\n"); 479 return PTR_ERR(tcm_loop_primary); 480 } 481 482 ret = bus_register(&tcm_loop_lld_bus); 483 if (ret) { 484 pr_err("bus_register() failed for tcm_loop_lld_bus\n"); 485 goto dev_unreg; 486 } 487 488 ret = driver_register(&tcm_loop_driverfs); 489 if (ret) { 490 pr_err("driver_register() failed for" 491 "tcm_loop_driverfs\n"); 492 goto bus_unreg; 493 } 494 495 pr_debug("Initialized TCM Loop Core Bus\n"); 496 return ret; 497 498 bus_unreg: 499 bus_unregister(&tcm_loop_lld_bus); 500 dev_unreg: 501 root_device_unregister(tcm_loop_primary); 502 return ret; 503 } 504 505 static void tcm_loop_release_core_bus(void) 506 { 507 driver_unregister(&tcm_loop_driverfs); 508 bus_unregister(&tcm_loop_lld_bus); 509 root_device_unregister(tcm_loop_primary); 510 511 pr_debug("Releasing TCM Loop Core BUS\n"); 512 } 513 514 static char *tcm_loop_get_fabric_name(void) 515 { 516 return "loopback"; 517 } 518 519 static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg) 520 { 521 return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); 522 } 523 524 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg) 525 { 526 /* 527 * Return the passed NAA identifier for the Target Port 528 */ 529 return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0]; 530 } 531 532 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg) 533 { 534 /* 535 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 536 * to represent the SCSI Target Port. 537 */ 538 return tl_tpg(se_tpg)->tl_tpgt; 539 } 540 541 /* 542 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated 543 * based upon the incoming fabric dependent SCSI Initiator Port 544 */ 545 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) 546 { 547 return 1; 548 } 549 550 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) 551 { 552 return 0; 553 } 554 555 /* 556 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for 557 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest 558 */ 559 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) 560 { 561 return 0; 562 } 563 564 /* 565 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will 566 * never be called for TCM_Loop by target_core_fabric_configfs.c code. 567 * It has been added here as a nop for target_fabric_tf_ops_check() 568 */ 569 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) 570 { 571 return 0; 572 } 573 574 static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg) 575 { 576 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 577 tl_se_tpg); 578 return tl_tpg->tl_fabric_prot_type; 579 } 580 581 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) 582 { 583 return 1; 584 } 585 586 static u32 tcm_loop_sess_get_index(struct se_session *se_sess) 587 { 588 return 1; 589 } 590 591 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) 592 { 593 return; 594 } 595 596 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) 597 { 598 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 599 struct tcm_loop_cmd, tl_se_cmd); 600 601 return tl_cmd->sc_cmd_state; 602 } 603 604 static int tcm_loop_shutdown_session(struct se_session *se_sess) 605 { 606 return 0; 607 } 608 609 static void tcm_loop_close_session(struct se_session *se_sess) 610 { 611 return; 612 }; 613 614 static int tcm_loop_write_pending(struct se_cmd *se_cmd) 615 { 616 /* 617 * Since Linux/SCSI has already sent down a struct scsi_cmnd 618 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array 619 * memory, and memory has already been mapped to struct se_cmd->t_mem_list 620 * format with transport_generic_map_mem_to_cmd(). 621 * 622 * We now tell TCM to add this WRITE CDB directly into the TCM storage 623 * object execution queue. 624 */ 625 target_execute_cmd(se_cmd); 626 return 0; 627 } 628 629 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) 630 { 631 return 0; 632 } 633 634 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) 635 { 636 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 637 struct tcm_loop_cmd, tl_se_cmd); 638 struct scsi_cmnd *sc = tl_cmd->sc; 639 640 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" 641 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 642 643 sc->result = SAM_STAT_GOOD; 644 set_host_byte(sc, DID_OK); 645 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 646 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 647 scsi_set_resid(sc, se_cmd->residual_count); 648 sc->scsi_done(sc); 649 return 0; 650 } 651 652 static int tcm_loop_queue_status(struct se_cmd *se_cmd) 653 { 654 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 655 struct tcm_loop_cmd, tl_se_cmd); 656 struct scsi_cmnd *sc = tl_cmd->sc; 657 658 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" 659 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 660 661 if (se_cmd->sense_buffer && 662 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 663 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 664 665 memcpy(sc->sense_buffer, se_cmd->sense_buffer, 666 SCSI_SENSE_BUFFERSIZE); 667 sc->result = SAM_STAT_CHECK_CONDITION; 668 set_driver_byte(sc, DRIVER_SENSE); 669 } else 670 sc->result = se_cmd->scsi_status; 671 672 set_host_byte(sc, DID_OK); 673 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 674 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 675 scsi_set_resid(sc, se_cmd->residual_count); 676 sc->scsi_done(sc); 677 return 0; 678 } 679 680 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) 681 { 682 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; 683 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; 684 /* 685 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead 686 * and wake up the wait_queue_head_t in tcm_loop_device_reset() 687 */ 688 atomic_set(&tl_tmr->tmr_complete, 1); 689 wake_up(&tl_tmr->tl_tmr_wait); 690 } 691 692 static void tcm_loop_aborted_task(struct se_cmd *se_cmd) 693 { 694 return; 695 } 696 697 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) 698 { 699 switch (tl_hba->tl_proto_id) { 700 case SCSI_PROTOCOL_SAS: 701 return "SAS"; 702 case SCSI_PROTOCOL_FCP: 703 return "FCP"; 704 case SCSI_PROTOCOL_ISCSI: 705 return "iSCSI"; 706 default: 707 break; 708 } 709 710 return "Unknown"; 711 } 712 713 /* Start items for tcm_loop_port_cit */ 714 715 static int tcm_loop_port_link( 716 struct se_portal_group *se_tpg, 717 struct se_lun *lun) 718 { 719 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 720 struct tcm_loop_tpg, tl_se_tpg); 721 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 722 723 atomic_inc_mb(&tl_tpg->tl_tpg_port_count); 724 /* 725 * Add Linux/SCSI struct scsi_device by HCTL 726 */ 727 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); 728 729 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); 730 return 0; 731 } 732 733 static void tcm_loop_port_unlink( 734 struct se_portal_group *se_tpg, 735 struct se_lun *se_lun) 736 { 737 struct scsi_device *sd; 738 struct tcm_loop_hba *tl_hba; 739 struct tcm_loop_tpg *tl_tpg; 740 741 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); 742 tl_hba = tl_tpg->tl_hba; 743 744 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, 745 se_lun->unpacked_lun); 746 if (!sd) { 747 pr_err("Unable to locate struct scsi_device for %d:%d:" 748 "%llu\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); 749 return; 750 } 751 /* 752 * Remove Linux/SCSI struct scsi_device by HCTL 753 */ 754 scsi_remove_device(sd); 755 scsi_device_put(sd); 756 757 atomic_dec_mb(&tl_tpg->tl_tpg_port_count); 758 759 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); 760 } 761 762 /* End items for tcm_loop_port_cit */ 763 764 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show( 765 struct config_item *item, char *page) 766 { 767 struct se_portal_group *se_tpg = attrib_to_tpg(item); 768 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 769 tl_se_tpg); 770 771 return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type); 772 } 773 774 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store( 775 struct config_item *item, const char *page, size_t count) 776 { 777 struct se_portal_group *se_tpg = attrib_to_tpg(item); 778 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 779 tl_se_tpg); 780 unsigned long val; 781 int ret = kstrtoul(page, 0, &val); 782 783 if (ret) { 784 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); 785 return ret; 786 } 787 if (val != 0 && val != 1 && val != 3) { 788 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val); 789 return -EINVAL; 790 } 791 tl_tpg->tl_fabric_prot_type = val; 792 793 return count; 794 } 795 796 CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type); 797 798 static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = { 799 &tcm_loop_tpg_attrib_attr_fabric_prot_type, 800 NULL, 801 }; 802 803 /* Start items for tcm_loop_nexus_cit */ 804 805 static int tcm_loop_make_nexus( 806 struct tcm_loop_tpg *tl_tpg, 807 const char *name) 808 { 809 struct se_portal_group *se_tpg; 810 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 811 struct tcm_loop_nexus *tl_nexus; 812 int ret = -ENOMEM; 813 814 if (tl_tpg->tl_nexus) { 815 pr_debug("tl_tpg->tl_nexus already exists\n"); 816 return -EEXIST; 817 } 818 se_tpg = &tl_tpg->tl_se_tpg; 819 820 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); 821 if (!tl_nexus) { 822 pr_err("Unable to allocate struct tcm_loop_nexus\n"); 823 return -ENOMEM; 824 } 825 /* 826 * Initialize the struct se_session pointer 827 */ 828 tl_nexus->se_sess = transport_init_session( 829 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS); 830 if (IS_ERR(tl_nexus->se_sess)) { 831 ret = PTR_ERR(tl_nexus->se_sess); 832 goto out; 833 } 834 /* 835 * Since we are running in 'demo mode' this call with generate a 836 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI 837 * Initiator port name of the passed configfs group 'name'. 838 */ 839 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 840 se_tpg, (unsigned char *)name); 841 if (!tl_nexus->se_sess->se_node_acl) { 842 transport_free_session(tl_nexus->se_sess); 843 goto out; 844 } 845 /* Now, register the I_T Nexus as active. */ 846 transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, 847 tl_nexus->se_sess, tl_nexus); 848 tl_tpg->tl_nexus = tl_nexus; 849 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" 850 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), 851 name); 852 return 0; 853 854 out: 855 kfree(tl_nexus); 856 return ret; 857 } 858 859 static int tcm_loop_drop_nexus( 860 struct tcm_loop_tpg *tpg) 861 { 862 struct se_session *se_sess; 863 struct tcm_loop_nexus *tl_nexus; 864 865 tl_nexus = tpg->tl_nexus; 866 if (!tl_nexus) 867 return -ENODEV; 868 869 se_sess = tl_nexus->se_sess; 870 if (!se_sess) 871 return -ENODEV; 872 873 if (atomic_read(&tpg->tl_tpg_port_count)) { 874 pr_err("Unable to remove TCM_Loop I_T Nexus with" 875 " active TPG port count: %d\n", 876 atomic_read(&tpg->tl_tpg_port_count)); 877 return -EPERM; 878 } 879 880 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" 881 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba), 882 tl_nexus->se_sess->se_node_acl->initiatorname); 883 /* 884 * Release the SCSI I_T Nexus to the emulated Target Port 885 */ 886 transport_deregister_session(tl_nexus->se_sess); 887 tpg->tl_nexus = NULL; 888 kfree(tl_nexus); 889 return 0; 890 } 891 892 /* End items for tcm_loop_nexus_cit */ 893 894 static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page) 895 { 896 struct se_portal_group *se_tpg = to_tpg(item); 897 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 898 struct tcm_loop_tpg, tl_se_tpg); 899 struct tcm_loop_nexus *tl_nexus; 900 ssize_t ret; 901 902 tl_nexus = tl_tpg->tl_nexus; 903 if (!tl_nexus) 904 return -ENODEV; 905 906 ret = snprintf(page, PAGE_SIZE, "%s\n", 907 tl_nexus->se_sess->se_node_acl->initiatorname); 908 909 return ret; 910 } 911 912 static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item, 913 const char *page, size_t count) 914 { 915 struct se_portal_group *se_tpg = to_tpg(item); 916 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 917 struct tcm_loop_tpg, tl_se_tpg); 918 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 919 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; 920 int ret; 921 /* 922 * Shutdown the active I_T nexus if 'NULL' is passed.. 923 */ 924 if (!strncmp(page, "NULL", 4)) { 925 ret = tcm_loop_drop_nexus(tl_tpg); 926 return (!ret) ? count : ret; 927 } 928 /* 929 * Otherwise make sure the passed virtual Initiator port WWN matches 930 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call 931 * tcm_loop_make_nexus() 932 */ 933 if (strlen(page) >= TL_WWN_ADDR_LEN) { 934 pr_err("Emulated NAA Sas Address: %s, exceeds" 935 " max: %d\n", page, TL_WWN_ADDR_LEN); 936 return -EINVAL; 937 } 938 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); 939 940 ptr = strstr(i_port, "naa."); 941 if (ptr) { 942 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { 943 pr_err("Passed SAS Initiator Port %s does not" 944 " match target port protoid: %s\n", i_port, 945 tcm_loop_dump_proto_id(tl_hba)); 946 return -EINVAL; 947 } 948 port_ptr = &i_port[0]; 949 goto check_newline; 950 } 951 ptr = strstr(i_port, "fc."); 952 if (ptr) { 953 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { 954 pr_err("Passed FCP Initiator Port %s does not" 955 " match target port protoid: %s\n", i_port, 956 tcm_loop_dump_proto_id(tl_hba)); 957 return -EINVAL; 958 } 959 port_ptr = &i_port[3]; /* Skip over "fc." */ 960 goto check_newline; 961 } 962 ptr = strstr(i_port, "iqn."); 963 if (ptr) { 964 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { 965 pr_err("Passed iSCSI Initiator Port %s does not" 966 " match target port protoid: %s\n", i_port, 967 tcm_loop_dump_proto_id(tl_hba)); 968 return -EINVAL; 969 } 970 port_ptr = &i_port[0]; 971 goto check_newline; 972 } 973 pr_err("Unable to locate prefix for emulated Initiator Port:" 974 " %s\n", i_port); 975 return -EINVAL; 976 /* 977 * Clear any trailing newline for the NAA WWN 978 */ 979 check_newline: 980 if (i_port[strlen(i_port)-1] == '\n') 981 i_port[strlen(i_port)-1] = '\0'; 982 983 ret = tcm_loop_make_nexus(tl_tpg, port_ptr); 984 if (ret < 0) 985 return ret; 986 987 return count; 988 } 989 990 static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item, 991 char *page) 992 { 993 struct se_portal_group *se_tpg = to_tpg(item); 994 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 995 struct tcm_loop_tpg, tl_se_tpg); 996 const char *status = NULL; 997 ssize_t ret = -EINVAL; 998 999 switch (tl_tpg->tl_transport_status) { 1000 case TCM_TRANSPORT_ONLINE: 1001 status = "online"; 1002 break; 1003 case TCM_TRANSPORT_OFFLINE: 1004 status = "offline"; 1005 break; 1006 default: 1007 break; 1008 } 1009 1010 if (status) 1011 ret = snprintf(page, PAGE_SIZE, "%s\n", status); 1012 1013 return ret; 1014 } 1015 1016 static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item, 1017 const char *page, size_t count) 1018 { 1019 struct se_portal_group *se_tpg = to_tpg(item); 1020 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1021 struct tcm_loop_tpg, tl_se_tpg); 1022 1023 if (!strncmp(page, "online", 6)) { 1024 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; 1025 return count; 1026 } 1027 if (!strncmp(page, "offline", 7)) { 1028 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE; 1029 if (tl_tpg->tl_nexus) { 1030 struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess; 1031 1032 core_allocate_nexus_loss_ua(tl_sess->se_node_acl); 1033 } 1034 return count; 1035 } 1036 return -EINVAL; 1037 } 1038 1039 static ssize_t tcm_loop_tpg_address_show(struct config_item *item, 1040 char *page) 1041 { 1042 struct se_portal_group *se_tpg = to_tpg(item); 1043 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1044 struct tcm_loop_tpg, tl_se_tpg); 1045 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 1046 1047 return snprintf(page, PAGE_SIZE, "%d:0:%d\n", 1048 tl_hba->sh->host_no, tl_tpg->tl_tpgt); 1049 } 1050 1051 CONFIGFS_ATTR(tcm_loop_tpg_, nexus); 1052 CONFIGFS_ATTR(tcm_loop_tpg_, transport_status); 1053 CONFIGFS_ATTR_RO(tcm_loop_tpg_, address); 1054 1055 static struct configfs_attribute *tcm_loop_tpg_attrs[] = { 1056 &tcm_loop_tpg_attr_nexus, 1057 &tcm_loop_tpg_attr_transport_status, 1058 &tcm_loop_tpg_attr_address, 1059 NULL, 1060 }; 1061 1062 /* Start items for tcm_loop_naa_cit */ 1063 1064 static struct se_portal_group *tcm_loop_make_naa_tpg( 1065 struct se_wwn *wwn, 1066 struct config_group *group, 1067 const char *name) 1068 { 1069 struct tcm_loop_hba *tl_hba = container_of(wwn, 1070 struct tcm_loop_hba, tl_hba_wwn); 1071 struct tcm_loop_tpg *tl_tpg; 1072 int ret; 1073 unsigned long tpgt; 1074 1075 if (strstr(name, "tpgt_") != name) { 1076 pr_err("Unable to locate \"tpgt_#\" directory" 1077 " group\n"); 1078 return ERR_PTR(-EINVAL); 1079 } 1080 if (kstrtoul(name+5, 10, &tpgt)) 1081 return ERR_PTR(-EINVAL); 1082 1083 if (tpgt >= TL_TPGS_PER_HBA) { 1084 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA:" 1085 " %u\n", tpgt, TL_TPGS_PER_HBA); 1086 return ERR_PTR(-EINVAL); 1087 } 1088 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; 1089 tl_tpg->tl_hba = tl_hba; 1090 tl_tpg->tl_tpgt = tpgt; 1091 /* 1092 * Register the tl_tpg as a emulated TCM Target Endpoint 1093 */ 1094 ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id); 1095 if (ret < 0) 1096 return ERR_PTR(-ENOMEM); 1097 1098 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" 1099 " Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba), 1100 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1101 1102 return &tl_tpg->tl_se_tpg; 1103 } 1104 1105 static void tcm_loop_drop_naa_tpg( 1106 struct se_portal_group *se_tpg) 1107 { 1108 struct se_wwn *wwn = se_tpg->se_tpg_wwn; 1109 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1110 struct tcm_loop_tpg, tl_se_tpg); 1111 struct tcm_loop_hba *tl_hba; 1112 unsigned short tpgt; 1113 1114 tl_hba = tl_tpg->tl_hba; 1115 tpgt = tl_tpg->tl_tpgt; 1116 /* 1117 * Release the I_T Nexus for the Virtual target link if present 1118 */ 1119 tcm_loop_drop_nexus(tl_tpg); 1120 /* 1121 * Deregister the tl_tpg as a emulated TCM Target Endpoint 1122 */ 1123 core_tpg_deregister(se_tpg); 1124 1125 tl_tpg->tl_hba = NULL; 1126 tl_tpg->tl_tpgt = 0; 1127 1128 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" 1129 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), 1130 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1131 } 1132 1133 /* End items for tcm_loop_naa_cit */ 1134 1135 /* Start items for tcm_loop_cit */ 1136 1137 static struct se_wwn *tcm_loop_make_scsi_hba( 1138 struct target_fabric_configfs *tf, 1139 struct config_group *group, 1140 const char *name) 1141 { 1142 struct tcm_loop_hba *tl_hba; 1143 struct Scsi_Host *sh; 1144 char *ptr; 1145 int ret, off = 0; 1146 1147 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); 1148 if (!tl_hba) { 1149 pr_err("Unable to allocate struct tcm_loop_hba\n"); 1150 return ERR_PTR(-ENOMEM); 1151 } 1152 /* 1153 * Determine the emulated Protocol Identifier and Target Port Name 1154 * based on the incoming configfs directory name. 1155 */ 1156 ptr = strstr(name, "naa."); 1157 if (ptr) { 1158 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; 1159 goto check_len; 1160 } 1161 ptr = strstr(name, "fc."); 1162 if (ptr) { 1163 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; 1164 off = 3; /* Skip over "fc." */ 1165 goto check_len; 1166 } 1167 ptr = strstr(name, "iqn."); 1168 if (!ptr) { 1169 pr_err("Unable to locate prefix for emulated Target " 1170 "Port: %s\n", name); 1171 ret = -EINVAL; 1172 goto out; 1173 } 1174 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; 1175 1176 check_len: 1177 if (strlen(name) >= TL_WWN_ADDR_LEN) { 1178 pr_err("Emulated NAA %s Address: %s, exceeds" 1179 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), 1180 TL_WWN_ADDR_LEN); 1181 ret = -EINVAL; 1182 goto out; 1183 } 1184 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); 1185 1186 /* 1187 * Call device_register(tl_hba->dev) to register the emulated 1188 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after 1189 * device_register() callbacks in tcm_loop_driver_probe() 1190 */ 1191 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); 1192 if (ret) 1193 goto out; 1194 1195 sh = tl_hba->sh; 1196 tcm_loop_hba_no_cnt++; 1197 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" 1198 " %s Address: %s at Linux/SCSI Host ID: %d\n", 1199 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); 1200 1201 return &tl_hba->tl_hba_wwn; 1202 out: 1203 kfree(tl_hba); 1204 return ERR_PTR(ret); 1205 } 1206 1207 static void tcm_loop_drop_scsi_hba( 1208 struct se_wwn *wwn) 1209 { 1210 struct tcm_loop_hba *tl_hba = container_of(wwn, 1211 struct tcm_loop_hba, tl_hba_wwn); 1212 1213 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target" 1214 " %s Address: %s at Linux/SCSI Host ID: %d\n", 1215 tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address, 1216 tl_hba->sh->host_no); 1217 /* 1218 * Call device_unregister() on the original tl_hba->dev. 1219 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will 1220 * release *tl_hba; 1221 */ 1222 device_unregister(&tl_hba->dev); 1223 } 1224 1225 /* Start items for tcm_loop_cit */ 1226 static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page) 1227 { 1228 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); 1229 } 1230 1231 CONFIGFS_ATTR_RO(tcm_loop_wwn_, version); 1232 1233 static struct configfs_attribute *tcm_loop_wwn_attrs[] = { 1234 &tcm_loop_wwn_attr_version, 1235 NULL, 1236 }; 1237 1238 /* End items for tcm_loop_cit */ 1239 1240 static const struct target_core_fabric_ops loop_ops = { 1241 .module = THIS_MODULE, 1242 .name = "loopback", 1243 .get_fabric_name = tcm_loop_get_fabric_name, 1244 .tpg_get_wwn = tcm_loop_get_endpoint_wwn, 1245 .tpg_get_tag = tcm_loop_get_tag, 1246 .tpg_check_demo_mode = tcm_loop_check_demo_mode, 1247 .tpg_check_demo_mode_cache = tcm_loop_check_demo_mode_cache, 1248 .tpg_check_demo_mode_write_protect = 1249 tcm_loop_check_demo_mode_write_protect, 1250 .tpg_check_prod_mode_write_protect = 1251 tcm_loop_check_prod_mode_write_protect, 1252 .tpg_check_prot_fabric_only = tcm_loop_check_prot_fabric_only, 1253 .tpg_get_inst_index = tcm_loop_get_inst_index, 1254 .check_stop_free = tcm_loop_check_stop_free, 1255 .release_cmd = tcm_loop_release_cmd, 1256 .shutdown_session = tcm_loop_shutdown_session, 1257 .close_session = tcm_loop_close_session, 1258 .sess_get_index = tcm_loop_sess_get_index, 1259 .write_pending = tcm_loop_write_pending, 1260 .write_pending_status = tcm_loop_write_pending_status, 1261 .set_default_node_attributes = tcm_loop_set_default_node_attributes, 1262 .get_cmd_state = tcm_loop_get_cmd_state, 1263 .queue_data_in = tcm_loop_queue_data_in, 1264 .queue_status = tcm_loop_queue_status, 1265 .queue_tm_rsp = tcm_loop_queue_tm_rsp, 1266 .aborted_task = tcm_loop_aborted_task, 1267 .fabric_make_wwn = tcm_loop_make_scsi_hba, 1268 .fabric_drop_wwn = tcm_loop_drop_scsi_hba, 1269 .fabric_make_tpg = tcm_loop_make_naa_tpg, 1270 .fabric_drop_tpg = tcm_loop_drop_naa_tpg, 1271 .fabric_post_link = tcm_loop_port_link, 1272 .fabric_pre_unlink = tcm_loop_port_unlink, 1273 .tfc_wwn_attrs = tcm_loop_wwn_attrs, 1274 .tfc_tpg_base_attrs = tcm_loop_tpg_attrs, 1275 .tfc_tpg_attrib_attrs = tcm_loop_tpg_attrib_attrs, 1276 }; 1277 1278 static int __init tcm_loop_fabric_init(void) 1279 { 1280 int ret = -ENOMEM; 1281 1282 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0); 1283 if (!tcm_loop_workqueue) 1284 goto out; 1285 1286 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", 1287 sizeof(struct tcm_loop_cmd), 1288 __alignof__(struct tcm_loop_cmd), 1289 0, NULL); 1290 if (!tcm_loop_cmd_cache) { 1291 pr_debug("kmem_cache_create() for" 1292 " tcm_loop_cmd_cache failed\n"); 1293 goto out_destroy_workqueue; 1294 } 1295 1296 ret = tcm_loop_alloc_core_bus(); 1297 if (ret) 1298 goto out_destroy_cache; 1299 1300 ret = target_register_template(&loop_ops); 1301 if (ret) 1302 goto out_release_core_bus; 1303 1304 return 0; 1305 1306 out_release_core_bus: 1307 tcm_loop_release_core_bus(); 1308 out_destroy_cache: 1309 kmem_cache_destroy(tcm_loop_cmd_cache); 1310 out_destroy_workqueue: 1311 destroy_workqueue(tcm_loop_workqueue); 1312 out: 1313 return ret; 1314 } 1315 1316 static void __exit tcm_loop_fabric_exit(void) 1317 { 1318 target_unregister_template(&loop_ops); 1319 tcm_loop_release_core_bus(); 1320 kmem_cache_destroy(tcm_loop_cmd_cache); 1321 destroy_workqueue(tcm_loop_workqueue); 1322 } 1323 1324 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); 1325 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>"); 1326 MODULE_LICENSE("GPL"); 1327 module_init(tcm_loop_fabric_init); 1328 module_exit(tcm_loop_fabric_exit); 1329