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