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 #include <target/target_core_configfs.h> 39 40 #include "tcm_loop.h" 41 42 #define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev) 43 44 static const struct target_core_fabric_ops loop_ops; 45 46 static struct workqueue_struct *tcm_loop_workqueue; 47 static struct kmem_cache *tcm_loop_cmd_cache; 48 49 static int tcm_loop_hba_no_cnt; 50 51 static int tcm_loop_queue_status(struct se_cmd *se_cmd); 52 53 /* 54 * Called from struct target_core_fabric_ops->check_stop_free() 55 */ 56 static int tcm_loop_check_stop_free(struct se_cmd *se_cmd) 57 { 58 /* 59 * Do not release struct se_cmd's containing a valid TMR 60 * pointer. These will be released directly in tcm_loop_device_reset() 61 * with transport_generic_free_cmd(). 62 */ 63 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 64 return 0; 65 /* 66 * Release the struct se_cmd, which will make a callback to release 67 * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd() 68 */ 69 transport_generic_free_cmd(se_cmd, 0); 70 return 1; 71 } 72 73 static void tcm_loop_release_cmd(struct se_cmd *se_cmd) 74 { 75 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 76 struct tcm_loop_cmd, tl_se_cmd); 77 78 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); 79 } 80 81 static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host) 82 { 83 seq_printf(m, "tcm_loop_proc_info()\n"); 84 return 0; 85 } 86 87 static int tcm_loop_driver_probe(struct device *); 88 static int tcm_loop_driver_remove(struct device *); 89 90 static int pseudo_lld_bus_match(struct device *dev, 91 struct device_driver *dev_driver) 92 { 93 return 1; 94 } 95 96 static struct bus_type tcm_loop_lld_bus = { 97 .name = "tcm_loop_bus", 98 .match = pseudo_lld_bus_match, 99 .probe = tcm_loop_driver_probe, 100 .remove = tcm_loop_driver_remove, 101 }; 102 103 static struct device_driver tcm_loop_driverfs = { 104 .name = "tcm_loop", 105 .bus = &tcm_loop_lld_bus, 106 }; 107 /* 108 * Used with root_device_register() in tcm_loop_alloc_core_bus() below 109 */ 110 static struct device *tcm_loop_primary; 111 112 static void tcm_loop_submission_work(struct work_struct *work) 113 { 114 struct tcm_loop_cmd *tl_cmd = 115 container_of(work, struct tcm_loop_cmd, work); 116 struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd; 117 struct scsi_cmnd *sc = tl_cmd->sc; 118 struct tcm_loop_nexus *tl_nexus; 119 struct tcm_loop_hba *tl_hba; 120 struct tcm_loop_tpg *tl_tpg; 121 struct scatterlist *sgl_bidi = NULL; 122 u32 sgl_bidi_count = 0, transfer_length; 123 int rc; 124 125 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 126 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 127 128 /* 129 * Ensure that this tl_tpg reference from the incoming sc->device->id 130 * has already been configured via tcm_loop_make_naa_tpg(). 131 */ 132 if (!tl_tpg->tl_hba) { 133 set_host_byte(sc, DID_NO_CONNECT); 134 goto out_done; 135 } 136 if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) { 137 set_host_byte(sc, DID_TRANSPORT_DISRUPTED); 138 goto out_done; 139 } 140 tl_nexus = tl_tpg->tl_nexus; 141 if (!tl_nexus) { 142 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus" 143 " does not exist\n"); 144 set_host_byte(sc, DID_ERROR); 145 goto out_done; 146 } 147 if (scsi_bidi_cmnd(sc)) { 148 struct scsi_data_buffer *sdb = scsi_in(sc); 149 150 sgl_bidi = sdb->table.sgl; 151 sgl_bidi_count = sdb->table.nents; 152 se_cmd->se_cmd_flags |= SCF_BIDI; 153 154 } 155 156 transfer_length = scsi_transfer_length(sc); 157 if (!scsi_prot_sg_count(sc) && 158 scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) { 159 se_cmd->prot_pto = true; 160 /* 161 * loopback transport doesn't support 162 * WRITE_GENERATE, READ_STRIP protection 163 * information operations, go ahead unprotected. 164 */ 165 transfer_length = scsi_bufflen(sc); 166 } 167 168 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 u32 tcm_loop_get_task_tag(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_tag; 606 } 607 608 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) 609 { 610 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 611 struct tcm_loop_cmd, tl_se_cmd); 612 613 return tl_cmd->sc_cmd_state; 614 } 615 616 static int tcm_loop_shutdown_session(struct se_session *se_sess) 617 { 618 return 0; 619 } 620 621 static void tcm_loop_close_session(struct se_session *se_sess) 622 { 623 return; 624 }; 625 626 static int tcm_loop_write_pending(struct se_cmd *se_cmd) 627 { 628 /* 629 * Since Linux/SCSI has already sent down a struct scsi_cmnd 630 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array 631 * memory, and memory has already been mapped to struct se_cmd->t_mem_list 632 * format with transport_generic_map_mem_to_cmd(). 633 * 634 * We now tell TCM to add this WRITE CDB directly into the TCM storage 635 * object execution queue. 636 */ 637 target_execute_cmd(se_cmd); 638 return 0; 639 } 640 641 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) 642 { 643 return 0; 644 } 645 646 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) 647 { 648 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 649 struct tcm_loop_cmd, tl_se_cmd); 650 struct scsi_cmnd *sc = tl_cmd->sc; 651 652 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" 653 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 654 655 sc->result = SAM_STAT_GOOD; 656 set_host_byte(sc, DID_OK); 657 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 658 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 659 scsi_set_resid(sc, se_cmd->residual_count); 660 sc->scsi_done(sc); 661 return 0; 662 } 663 664 static int tcm_loop_queue_status(struct se_cmd *se_cmd) 665 { 666 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 667 struct tcm_loop_cmd, tl_se_cmd); 668 struct scsi_cmnd *sc = tl_cmd->sc; 669 670 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" 671 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 672 673 if (se_cmd->sense_buffer && 674 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 675 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 676 677 memcpy(sc->sense_buffer, se_cmd->sense_buffer, 678 SCSI_SENSE_BUFFERSIZE); 679 sc->result = SAM_STAT_CHECK_CONDITION; 680 set_driver_byte(sc, DRIVER_SENSE); 681 } else 682 sc->result = se_cmd->scsi_status; 683 684 set_host_byte(sc, DID_OK); 685 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 686 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 687 scsi_set_resid(sc, se_cmd->residual_count); 688 sc->scsi_done(sc); 689 return 0; 690 } 691 692 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) 693 { 694 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; 695 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; 696 /* 697 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead 698 * and wake up the wait_queue_head_t in tcm_loop_device_reset() 699 */ 700 atomic_set(&tl_tmr->tmr_complete, 1); 701 wake_up(&tl_tmr->tl_tmr_wait); 702 } 703 704 static void tcm_loop_aborted_task(struct se_cmd *se_cmd) 705 { 706 return; 707 } 708 709 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) 710 { 711 switch (tl_hba->tl_proto_id) { 712 case SCSI_PROTOCOL_SAS: 713 return "SAS"; 714 case SCSI_PROTOCOL_FCP: 715 return "FCP"; 716 case SCSI_PROTOCOL_ISCSI: 717 return "iSCSI"; 718 default: 719 break; 720 } 721 722 return "Unknown"; 723 } 724 725 /* Start items for tcm_loop_port_cit */ 726 727 static int tcm_loop_port_link( 728 struct se_portal_group *se_tpg, 729 struct se_lun *lun) 730 { 731 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 732 struct tcm_loop_tpg, tl_se_tpg); 733 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 734 735 atomic_inc_mb(&tl_tpg->tl_tpg_port_count); 736 /* 737 * Add Linux/SCSI struct scsi_device by HCTL 738 */ 739 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); 740 741 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); 742 return 0; 743 } 744 745 static void tcm_loop_port_unlink( 746 struct se_portal_group *se_tpg, 747 struct se_lun *se_lun) 748 { 749 struct scsi_device *sd; 750 struct tcm_loop_hba *tl_hba; 751 struct tcm_loop_tpg *tl_tpg; 752 753 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); 754 tl_hba = tl_tpg->tl_hba; 755 756 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, 757 se_lun->unpacked_lun); 758 if (!sd) { 759 pr_err("Unable to locate struct scsi_device for %d:%d:" 760 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); 761 return; 762 } 763 /* 764 * Remove Linux/SCSI struct scsi_device by HCTL 765 */ 766 scsi_remove_device(sd); 767 scsi_device_put(sd); 768 769 atomic_dec_mb(&tl_tpg->tl_tpg_port_count); 770 771 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); 772 } 773 774 /* End items for tcm_loop_port_cit */ 775 776 static ssize_t tcm_loop_tpg_attrib_show_fabric_prot_type( 777 struct se_portal_group *se_tpg, 778 char *page) 779 { 780 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 781 tl_se_tpg); 782 783 return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type); 784 } 785 786 static ssize_t tcm_loop_tpg_attrib_store_fabric_prot_type( 787 struct se_portal_group *se_tpg, 788 const char *page, 789 size_t count) 790 { 791 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 792 tl_se_tpg); 793 unsigned long val; 794 int ret = kstrtoul(page, 0, &val); 795 796 if (ret) { 797 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); 798 return ret; 799 } 800 if (val != 0 && val != 1 && val != 3) { 801 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val); 802 return -EINVAL; 803 } 804 tl_tpg->tl_fabric_prot_type = val; 805 806 return count; 807 } 808 809 TF_TPG_ATTRIB_ATTR(tcm_loop, fabric_prot_type, S_IRUGO | S_IWUSR); 810 811 static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = { 812 &tcm_loop_tpg_attrib_fabric_prot_type.attr, 813 NULL, 814 }; 815 816 /* Start items for tcm_loop_nexus_cit */ 817 818 static int tcm_loop_make_nexus( 819 struct tcm_loop_tpg *tl_tpg, 820 const char *name) 821 { 822 struct se_portal_group *se_tpg; 823 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 824 struct tcm_loop_nexus *tl_nexus; 825 int ret = -ENOMEM; 826 827 if (tl_tpg->tl_nexus) { 828 pr_debug("tl_tpg->tl_nexus already exists\n"); 829 return -EEXIST; 830 } 831 se_tpg = &tl_tpg->tl_se_tpg; 832 833 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); 834 if (!tl_nexus) { 835 pr_err("Unable to allocate struct tcm_loop_nexus\n"); 836 return -ENOMEM; 837 } 838 /* 839 * Initialize the struct se_session pointer 840 */ 841 tl_nexus->se_sess = transport_init_session( 842 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS); 843 if (IS_ERR(tl_nexus->se_sess)) { 844 ret = PTR_ERR(tl_nexus->se_sess); 845 goto out; 846 } 847 /* 848 * Since we are running in 'demo mode' this call with generate a 849 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI 850 * Initiator port name of the passed configfs group 'name'. 851 */ 852 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 853 se_tpg, (unsigned char *)name); 854 if (!tl_nexus->se_sess->se_node_acl) { 855 transport_free_session(tl_nexus->se_sess); 856 goto out; 857 } 858 /* Now, register the SAS I_T Nexus as active. */ 859 transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, 860 tl_nexus->se_sess, tl_nexus); 861 tl_tpg->tl_nexus = tl_nexus; 862 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" 863 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), 864 name); 865 return 0; 866 867 out: 868 kfree(tl_nexus); 869 return ret; 870 } 871 872 static int tcm_loop_drop_nexus( 873 struct tcm_loop_tpg *tpg) 874 { 875 struct se_session *se_sess; 876 struct tcm_loop_nexus *tl_nexus; 877 878 tl_nexus = tpg->tl_nexus; 879 if (!tl_nexus) 880 return -ENODEV; 881 882 se_sess = tl_nexus->se_sess; 883 if (!se_sess) 884 return -ENODEV; 885 886 if (atomic_read(&tpg->tl_tpg_port_count)) { 887 pr_err("Unable to remove TCM_Loop I_T Nexus with" 888 " active TPG port count: %d\n", 889 atomic_read(&tpg->tl_tpg_port_count)); 890 return -EPERM; 891 } 892 893 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" 894 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba), 895 tl_nexus->se_sess->se_node_acl->initiatorname); 896 /* 897 * Release the SCSI I_T Nexus to the emulated SAS Target Port 898 */ 899 transport_deregister_session(tl_nexus->se_sess); 900 tpg->tl_nexus = NULL; 901 kfree(tl_nexus); 902 return 0; 903 } 904 905 /* End items for tcm_loop_nexus_cit */ 906 907 static ssize_t tcm_loop_tpg_show_nexus( 908 struct se_portal_group *se_tpg, 909 char *page) 910 { 911 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 912 struct tcm_loop_tpg, tl_se_tpg); 913 struct tcm_loop_nexus *tl_nexus; 914 ssize_t ret; 915 916 tl_nexus = tl_tpg->tl_nexus; 917 if (!tl_nexus) 918 return -ENODEV; 919 920 ret = snprintf(page, PAGE_SIZE, "%s\n", 921 tl_nexus->se_sess->se_node_acl->initiatorname); 922 923 return ret; 924 } 925 926 static ssize_t tcm_loop_tpg_store_nexus( 927 struct se_portal_group *se_tpg, 928 const char *page, 929 size_t count) 930 { 931 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 932 struct tcm_loop_tpg, tl_se_tpg); 933 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 934 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; 935 int ret; 936 /* 937 * Shutdown the active I_T nexus if 'NULL' is passed.. 938 */ 939 if (!strncmp(page, "NULL", 4)) { 940 ret = tcm_loop_drop_nexus(tl_tpg); 941 return (!ret) ? count : ret; 942 } 943 /* 944 * Otherwise make sure the passed virtual Initiator port WWN matches 945 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call 946 * tcm_loop_make_nexus() 947 */ 948 if (strlen(page) >= TL_WWN_ADDR_LEN) { 949 pr_err("Emulated NAA Sas Address: %s, exceeds" 950 " max: %d\n", page, TL_WWN_ADDR_LEN); 951 return -EINVAL; 952 } 953 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); 954 955 ptr = strstr(i_port, "naa."); 956 if (ptr) { 957 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { 958 pr_err("Passed SAS Initiator Port %s does not" 959 " match target port protoid: %s\n", i_port, 960 tcm_loop_dump_proto_id(tl_hba)); 961 return -EINVAL; 962 } 963 port_ptr = &i_port[0]; 964 goto check_newline; 965 } 966 ptr = strstr(i_port, "fc."); 967 if (ptr) { 968 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { 969 pr_err("Passed FCP Initiator Port %s does not" 970 " match target port protoid: %s\n", i_port, 971 tcm_loop_dump_proto_id(tl_hba)); 972 return -EINVAL; 973 } 974 port_ptr = &i_port[3]; /* Skip over "fc." */ 975 goto check_newline; 976 } 977 ptr = strstr(i_port, "iqn."); 978 if (ptr) { 979 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { 980 pr_err("Passed iSCSI Initiator Port %s does not" 981 " match target port protoid: %s\n", i_port, 982 tcm_loop_dump_proto_id(tl_hba)); 983 return -EINVAL; 984 } 985 port_ptr = &i_port[0]; 986 goto check_newline; 987 } 988 pr_err("Unable to locate prefix for emulated Initiator Port:" 989 " %s\n", i_port); 990 return -EINVAL; 991 /* 992 * Clear any trailing newline for the NAA WWN 993 */ 994 check_newline: 995 if (i_port[strlen(i_port)-1] == '\n') 996 i_port[strlen(i_port)-1] = '\0'; 997 998 ret = tcm_loop_make_nexus(tl_tpg, port_ptr); 999 if (ret < 0) 1000 return ret; 1001 1002 return count; 1003 } 1004 1005 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); 1006 1007 static ssize_t tcm_loop_tpg_show_transport_status( 1008 struct se_portal_group *se_tpg, 1009 char *page) 1010 { 1011 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1012 struct tcm_loop_tpg, tl_se_tpg); 1013 const char *status = NULL; 1014 ssize_t ret = -EINVAL; 1015 1016 switch (tl_tpg->tl_transport_status) { 1017 case TCM_TRANSPORT_ONLINE: 1018 status = "online"; 1019 break; 1020 case TCM_TRANSPORT_OFFLINE: 1021 status = "offline"; 1022 break; 1023 default: 1024 break; 1025 } 1026 1027 if (status) 1028 ret = snprintf(page, PAGE_SIZE, "%s\n", status); 1029 1030 return ret; 1031 } 1032 1033 static ssize_t tcm_loop_tpg_store_transport_status( 1034 struct se_portal_group *se_tpg, 1035 const char *page, 1036 size_t count) 1037 { 1038 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1039 struct tcm_loop_tpg, tl_se_tpg); 1040 1041 if (!strncmp(page, "online", 6)) { 1042 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; 1043 return count; 1044 } 1045 if (!strncmp(page, "offline", 7)) { 1046 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE; 1047 return count; 1048 } 1049 return -EINVAL; 1050 } 1051 1052 TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR); 1053 1054 static struct configfs_attribute *tcm_loop_tpg_attrs[] = { 1055 &tcm_loop_tpg_nexus.attr, 1056 &tcm_loop_tpg_transport_status.attr, 1057 NULL, 1058 }; 1059 1060 /* Start items for tcm_loop_naa_cit */ 1061 1062 static struct se_portal_group *tcm_loop_make_naa_tpg( 1063 struct se_wwn *wwn, 1064 struct config_group *group, 1065 const char *name) 1066 { 1067 struct tcm_loop_hba *tl_hba = container_of(wwn, 1068 struct tcm_loop_hba, tl_hba_wwn); 1069 struct tcm_loop_tpg *tl_tpg; 1070 int ret; 1071 unsigned long tpgt; 1072 1073 if (strstr(name, "tpgt_") != name) { 1074 pr_err("Unable to locate \"tpgt_#\" directory" 1075 " group\n"); 1076 return ERR_PTR(-EINVAL); 1077 } 1078 if (kstrtoul(name+5, 10, &tpgt)) 1079 return ERR_PTR(-EINVAL); 1080 1081 if (tpgt >= TL_TPGS_PER_HBA) { 1082 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA:" 1083 " %u\n", tpgt, TL_TPGS_PER_HBA); 1084 return ERR_PTR(-EINVAL); 1085 } 1086 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; 1087 tl_tpg->tl_hba = tl_hba; 1088 tl_tpg->tl_tpgt = tpgt; 1089 /* 1090 * Register the tl_tpg as a emulated SAS TCM Target Endpoint 1091 */ 1092 ret = core_tpg_register(&loop_ops, wwn, &tl_tpg->tl_se_tpg, 1093 tl_hba->tl_proto_id); 1094 if (ret < 0) 1095 return ERR_PTR(-ENOMEM); 1096 1097 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" 1098 " Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba), 1099 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1100 1101 return &tl_tpg->tl_se_tpg; 1102 } 1103 1104 static void tcm_loop_drop_naa_tpg( 1105 struct se_portal_group *se_tpg) 1106 { 1107 struct se_wwn *wwn = se_tpg->se_tpg_wwn; 1108 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1109 struct tcm_loop_tpg, tl_se_tpg); 1110 struct tcm_loop_hba *tl_hba; 1111 unsigned short tpgt; 1112 1113 tl_hba = tl_tpg->tl_hba; 1114 tpgt = tl_tpg->tl_tpgt; 1115 /* 1116 * Release the I_T Nexus for the Virtual SAS link if present 1117 */ 1118 tcm_loop_drop_nexus(tl_tpg); 1119 /* 1120 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint 1121 */ 1122 core_tpg_deregister(se_tpg); 1123 1124 tl_tpg->tl_hba = NULL; 1125 tl_tpg->tl_tpgt = 0; 1126 1127 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" 1128 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), 1129 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1130 } 1131 1132 /* End items for tcm_loop_naa_cit */ 1133 1134 /* Start items for tcm_loop_cit */ 1135 1136 static struct se_wwn *tcm_loop_make_scsi_hba( 1137 struct target_fabric_configfs *tf, 1138 struct config_group *group, 1139 const char *name) 1140 { 1141 struct tcm_loop_hba *tl_hba; 1142 struct Scsi_Host *sh; 1143 char *ptr; 1144 int ret, off = 0; 1145 1146 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); 1147 if (!tl_hba) { 1148 pr_err("Unable to allocate struct tcm_loop_hba\n"); 1149 return ERR_PTR(-ENOMEM); 1150 } 1151 /* 1152 * Determine the emulated Protocol Identifier and Target Port Name 1153 * based on the incoming configfs directory name. 1154 */ 1155 ptr = strstr(name, "naa."); 1156 if (ptr) { 1157 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; 1158 goto check_len; 1159 } 1160 ptr = strstr(name, "fc."); 1161 if (ptr) { 1162 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; 1163 off = 3; /* Skip over "fc." */ 1164 goto check_len; 1165 } 1166 ptr = strstr(name, "iqn."); 1167 if (!ptr) { 1168 pr_err("Unable to locate prefix for emulated Target " 1169 "Port: %s\n", name); 1170 ret = -EINVAL; 1171 goto out; 1172 } 1173 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; 1174 1175 check_len: 1176 if (strlen(name) >= TL_WWN_ADDR_LEN) { 1177 pr_err("Emulated NAA %s Address: %s, exceeds" 1178 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), 1179 TL_WWN_ADDR_LEN); 1180 ret = -EINVAL; 1181 goto out; 1182 } 1183 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); 1184 1185 /* 1186 * Call device_register(tl_hba->dev) to register the emulated 1187 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after 1188 * device_register() callbacks in tcm_loop_driver_probe() 1189 */ 1190 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); 1191 if (ret) 1192 goto out; 1193 1194 sh = tl_hba->sh; 1195 tcm_loop_hba_no_cnt++; 1196 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" 1197 " %s Address: %s at Linux/SCSI Host ID: %d\n", 1198 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); 1199 1200 return &tl_hba->tl_hba_wwn; 1201 out: 1202 kfree(tl_hba); 1203 return ERR_PTR(ret); 1204 } 1205 1206 static void tcm_loop_drop_scsi_hba( 1207 struct se_wwn *wwn) 1208 { 1209 struct tcm_loop_hba *tl_hba = container_of(wwn, 1210 struct tcm_loop_hba, tl_hba_wwn); 1211 1212 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target" 1213 " SAS Address: %s at Linux/SCSI Host ID: %d\n", 1214 tl_hba->tl_wwn_address, tl_hba->sh->host_no); 1215 /* 1216 * Call device_unregister() on the original tl_hba->dev. 1217 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will 1218 * release *tl_hba; 1219 */ 1220 device_unregister(&tl_hba->dev); 1221 } 1222 1223 /* Start items for tcm_loop_cit */ 1224 static ssize_t tcm_loop_wwn_show_attr_version( 1225 struct target_fabric_configfs *tf, 1226 char *page) 1227 { 1228 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); 1229 } 1230 1231 TF_WWN_ATTR_RO(tcm_loop, version); 1232 1233 static struct configfs_attribute *tcm_loop_wwn_attrs[] = { 1234 &tcm_loop_wwn_version.attr, 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_task_tag = tcm_loop_get_task_tag, 1263 .get_cmd_state = tcm_loop_get_cmd_state, 1264 .queue_data_in = tcm_loop_queue_data_in, 1265 .queue_status = tcm_loop_queue_status, 1266 .queue_tm_rsp = tcm_loop_queue_tm_rsp, 1267 .aborted_task = tcm_loop_aborted_task, 1268 .fabric_make_wwn = tcm_loop_make_scsi_hba, 1269 .fabric_drop_wwn = tcm_loop_drop_scsi_hba, 1270 .fabric_make_tpg = tcm_loop_make_naa_tpg, 1271 .fabric_drop_tpg = tcm_loop_drop_naa_tpg, 1272 .fabric_post_link = tcm_loop_port_link, 1273 .fabric_pre_unlink = tcm_loop_port_unlink, 1274 .tfc_wwn_attrs = tcm_loop_wwn_attrs, 1275 .tfc_tpg_base_attrs = tcm_loop_tpg_attrs, 1276 .tfc_tpg_attrib_attrs = tcm_loop_tpg_attrib_attrs, 1277 }; 1278 1279 static int __init tcm_loop_fabric_init(void) 1280 { 1281 int ret = -ENOMEM; 1282 1283 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0); 1284 if (!tcm_loop_workqueue) 1285 goto out; 1286 1287 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", 1288 sizeof(struct tcm_loop_cmd), 1289 __alignof__(struct tcm_loop_cmd), 1290 0, NULL); 1291 if (!tcm_loop_cmd_cache) { 1292 pr_debug("kmem_cache_create() for" 1293 " tcm_loop_cmd_cache failed\n"); 1294 goto out_destroy_workqueue; 1295 } 1296 1297 ret = tcm_loop_alloc_core_bus(); 1298 if (ret) 1299 goto out_destroy_cache; 1300 1301 ret = target_register_template(&loop_ops); 1302 if (ret) 1303 goto out_release_core_bus; 1304 1305 return 0; 1306 1307 out_release_core_bus: 1308 tcm_loop_release_core_bus(); 1309 out_destroy_cache: 1310 kmem_cache_destroy(tcm_loop_cmd_cache); 1311 out_destroy_workqueue: 1312 destroy_workqueue(tcm_loop_workqueue); 1313 out: 1314 return ret; 1315 } 1316 1317 static void __exit tcm_loop_fabric_exit(void) 1318 { 1319 target_unregister_template(&loop_ops); 1320 tcm_loop_release_core_bus(); 1321 kmem_cache_destroy(tcm_loop_cmd_cache); 1322 destroy_workqueue(tcm_loop_workqueue); 1323 } 1324 1325 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); 1326 MODULE_AUTHOR("Nicholas A. Bellinger <[email protected]>"); 1327 MODULE_LICENSE("GPL"); 1328 module_init(tcm_loop_fabric_init); 1329 module_exit(tcm_loop_fabric_exit); 1330