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