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 static u32 tcm_loop_get_pr_transport_id( 546 struct se_portal_group *se_tpg, 547 struct se_node_acl *se_nacl, 548 struct t10_pr_registration *pr_reg, 549 int *format_code, 550 unsigned char *buf) 551 { 552 struct tcm_loop_hba *tl_hba = tl_tpg(se_tpg)->tl_hba; 553 554 switch (tl_hba->tl_proto_id) { 555 case SCSI_PROTOCOL_SAS: 556 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 557 format_code, buf); 558 case SCSI_PROTOCOL_FCP: 559 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 560 format_code, buf); 561 case SCSI_PROTOCOL_ISCSI: 562 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 563 format_code, buf); 564 default: 565 pr_err("Unknown tl_proto_id: 0x%02x, using" 566 " SAS emulation\n", tl_hba->tl_proto_id); 567 break; 568 } 569 570 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 571 format_code, buf); 572 } 573 574 static u32 tcm_loop_get_pr_transport_id_len( 575 struct se_portal_group *se_tpg, 576 struct se_node_acl *se_nacl, 577 struct t10_pr_registration *pr_reg, 578 int *format_code) 579 { 580 struct tcm_loop_hba *tl_hba = tl_tpg(se_tpg)->tl_hba; 581 582 switch (tl_hba->tl_proto_id) { 583 case SCSI_PROTOCOL_SAS: 584 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 585 format_code); 586 case SCSI_PROTOCOL_FCP: 587 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 588 format_code); 589 case SCSI_PROTOCOL_ISCSI: 590 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 591 format_code); 592 default: 593 pr_err("Unknown tl_proto_id: 0x%02x, using" 594 " SAS emulation\n", tl_hba->tl_proto_id); 595 break; 596 } 597 598 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 599 format_code); 600 } 601 602 /* 603 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above 604 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. 605 */ 606 static char *tcm_loop_parse_pr_out_transport_id( 607 struct se_portal_group *se_tpg, 608 const char *buf, 609 u32 *out_tid_len, 610 char **port_nexus_ptr) 611 { 612 struct tcm_loop_hba *tl_hba = tl_tpg(se_tpg)->tl_hba; 613 614 switch (tl_hba->tl_proto_id) { 615 case SCSI_PROTOCOL_SAS: 616 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 617 port_nexus_ptr); 618 case SCSI_PROTOCOL_FCP: 619 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 620 port_nexus_ptr); 621 case SCSI_PROTOCOL_ISCSI: 622 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 623 port_nexus_ptr); 624 default: 625 pr_err("Unknown tl_proto_id: 0x%02x, using" 626 " SAS emulation\n", tl_hba->tl_proto_id); 627 break; 628 } 629 630 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 631 port_nexus_ptr); 632 } 633 634 /* 635 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated 636 * based upon the incoming fabric dependent SCSI Initiator Port 637 */ 638 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) 639 { 640 return 1; 641 } 642 643 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) 644 { 645 return 0; 646 } 647 648 /* 649 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for 650 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest 651 */ 652 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) 653 { 654 return 0; 655 } 656 657 /* 658 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will 659 * never be called for TCM_Loop by target_core_fabric_configfs.c code. 660 * It has been added here as a nop for target_fabric_tf_ops_check() 661 */ 662 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) 663 { 664 return 0; 665 } 666 667 static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg) 668 { 669 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 670 tl_se_tpg); 671 return tl_tpg->tl_fabric_prot_type; 672 } 673 674 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) 675 { 676 return 1; 677 } 678 679 static u32 tcm_loop_sess_get_index(struct se_session *se_sess) 680 { 681 return 1; 682 } 683 684 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) 685 { 686 return; 687 } 688 689 static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd) 690 { 691 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 692 struct tcm_loop_cmd, tl_se_cmd); 693 694 return tl_cmd->sc_cmd_tag; 695 } 696 697 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) 698 { 699 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 700 struct tcm_loop_cmd, tl_se_cmd); 701 702 return tl_cmd->sc_cmd_state; 703 } 704 705 static int tcm_loop_shutdown_session(struct se_session *se_sess) 706 { 707 return 0; 708 } 709 710 static void tcm_loop_close_session(struct se_session *se_sess) 711 { 712 return; 713 }; 714 715 static int tcm_loop_write_pending(struct se_cmd *se_cmd) 716 { 717 /* 718 * Since Linux/SCSI has already sent down a struct scsi_cmnd 719 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array 720 * memory, and memory has already been mapped to struct se_cmd->t_mem_list 721 * format with transport_generic_map_mem_to_cmd(). 722 * 723 * We now tell TCM to add this WRITE CDB directly into the TCM storage 724 * object execution queue. 725 */ 726 target_execute_cmd(se_cmd); 727 return 0; 728 } 729 730 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) 731 { 732 return 0; 733 } 734 735 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) 736 { 737 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 738 struct tcm_loop_cmd, tl_se_cmd); 739 struct scsi_cmnd *sc = tl_cmd->sc; 740 741 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" 742 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 743 744 sc->result = SAM_STAT_GOOD; 745 set_host_byte(sc, DID_OK); 746 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 747 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 748 scsi_set_resid(sc, se_cmd->residual_count); 749 sc->scsi_done(sc); 750 return 0; 751 } 752 753 static int tcm_loop_queue_status(struct se_cmd *se_cmd) 754 { 755 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 756 struct tcm_loop_cmd, tl_se_cmd); 757 struct scsi_cmnd *sc = tl_cmd->sc; 758 759 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" 760 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 761 762 if (se_cmd->sense_buffer && 763 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 764 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 765 766 memcpy(sc->sense_buffer, se_cmd->sense_buffer, 767 SCSI_SENSE_BUFFERSIZE); 768 sc->result = SAM_STAT_CHECK_CONDITION; 769 set_driver_byte(sc, DRIVER_SENSE); 770 } else 771 sc->result = se_cmd->scsi_status; 772 773 set_host_byte(sc, DID_OK); 774 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 775 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 776 scsi_set_resid(sc, se_cmd->residual_count); 777 sc->scsi_done(sc); 778 return 0; 779 } 780 781 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) 782 { 783 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; 784 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; 785 /* 786 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead 787 * and wake up the wait_queue_head_t in tcm_loop_device_reset() 788 */ 789 atomic_set(&tl_tmr->tmr_complete, 1); 790 wake_up(&tl_tmr->tl_tmr_wait); 791 } 792 793 static void tcm_loop_aborted_task(struct se_cmd *se_cmd) 794 { 795 return; 796 } 797 798 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) 799 { 800 switch (tl_hba->tl_proto_id) { 801 case SCSI_PROTOCOL_SAS: 802 return "SAS"; 803 case SCSI_PROTOCOL_FCP: 804 return "FCP"; 805 case SCSI_PROTOCOL_ISCSI: 806 return "iSCSI"; 807 default: 808 break; 809 } 810 811 return "Unknown"; 812 } 813 814 /* Start items for tcm_loop_port_cit */ 815 816 static int tcm_loop_port_link( 817 struct se_portal_group *se_tpg, 818 struct se_lun *lun) 819 { 820 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 821 struct tcm_loop_tpg, tl_se_tpg); 822 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 823 824 atomic_inc_mb(&tl_tpg->tl_tpg_port_count); 825 /* 826 * Add Linux/SCSI struct scsi_device by HCTL 827 */ 828 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); 829 830 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); 831 return 0; 832 } 833 834 static void tcm_loop_port_unlink( 835 struct se_portal_group *se_tpg, 836 struct se_lun *se_lun) 837 { 838 struct scsi_device *sd; 839 struct tcm_loop_hba *tl_hba; 840 struct tcm_loop_tpg *tl_tpg; 841 842 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); 843 tl_hba = tl_tpg->tl_hba; 844 845 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, 846 se_lun->unpacked_lun); 847 if (!sd) { 848 pr_err("Unable to locate struct scsi_device for %d:%d:" 849 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); 850 return; 851 } 852 /* 853 * Remove Linux/SCSI struct scsi_device by HCTL 854 */ 855 scsi_remove_device(sd); 856 scsi_device_put(sd); 857 858 atomic_dec_mb(&tl_tpg->tl_tpg_port_count); 859 860 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); 861 } 862 863 /* End items for tcm_loop_port_cit */ 864 865 static ssize_t tcm_loop_tpg_attrib_show_fabric_prot_type( 866 struct se_portal_group *se_tpg, 867 char *page) 868 { 869 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 870 tl_se_tpg); 871 872 return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type); 873 } 874 875 static ssize_t tcm_loop_tpg_attrib_store_fabric_prot_type( 876 struct se_portal_group *se_tpg, 877 const char *page, 878 size_t count) 879 { 880 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 881 tl_se_tpg); 882 unsigned long val; 883 int ret = kstrtoul(page, 0, &val); 884 885 if (ret) { 886 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); 887 return ret; 888 } 889 if (val != 0 && val != 1 && val != 3) { 890 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val); 891 return -EINVAL; 892 } 893 tl_tpg->tl_fabric_prot_type = val; 894 895 return count; 896 } 897 898 TF_TPG_ATTRIB_ATTR(tcm_loop, fabric_prot_type, S_IRUGO | S_IWUSR); 899 900 static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = { 901 &tcm_loop_tpg_attrib_fabric_prot_type.attr, 902 NULL, 903 }; 904 905 /* Start items for tcm_loop_nexus_cit */ 906 907 static int tcm_loop_make_nexus( 908 struct tcm_loop_tpg *tl_tpg, 909 const char *name) 910 { 911 struct se_portal_group *se_tpg; 912 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 913 struct tcm_loop_nexus *tl_nexus; 914 int ret = -ENOMEM; 915 916 if (tl_tpg->tl_nexus) { 917 pr_debug("tl_tpg->tl_nexus already exists\n"); 918 return -EEXIST; 919 } 920 se_tpg = &tl_tpg->tl_se_tpg; 921 922 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); 923 if (!tl_nexus) { 924 pr_err("Unable to allocate struct tcm_loop_nexus\n"); 925 return -ENOMEM; 926 } 927 /* 928 * Initialize the struct se_session pointer 929 */ 930 tl_nexus->se_sess = transport_init_session( 931 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS); 932 if (IS_ERR(tl_nexus->se_sess)) { 933 ret = PTR_ERR(tl_nexus->se_sess); 934 goto out; 935 } 936 /* 937 * Since we are running in 'demo mode' this call with generate a 938 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI 939 * Initiator port name of the passed configfs group 'name'. 940 */ 941 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 942 se_tpg, (unsigned char *)name); 943 if (!tl_nexus->se_sess->se_node_acl) { 944 transport_free_session(tl_nexus->se_sess); 945 goto out; 946 } 947 /* Now, register the SAS I_T Nexus as active. */ 948 transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, 949 tl_nexus->se_sess, tl_nexus); 950 tl_tpg->tl_nexus = tl_nexus; 951 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" 952 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), 953 name); 954 return 0; 955 956 out: 957 kfree(tl_nexus); 958 return ret; 959 } 960 961 static int tcm_loop_drop_nexus( 962 struct tcm_loop_tpg *tpg) 963 { 964 struct se_session *se_sess; 965 struct tcm_loop_nexus *tl_nexus; 966 967 tl_nexus = tpg->tl_nexus; 968 if (!tl_nexus) 969 return -ENODEV; 970 971 se_sess = tl_nexus->se_sess; 972 if (!se_sess) 973 return -ENODEV; 974 975 if (atomic_read(&tpg->tl_tpg_port_count)) { 976 pr_err("Unable to remove TCM_Loop I_T Nexus with" 977 " active TPG port count: %d\n", 978 atomic_read(&tpg->tl_tpg_port_count)); 979 return -EPERM; 980 } 981 982 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" 983 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba), 984 tl_nexus->se_sess->se_node_acl->initiatorname); 985 /* 986 * Release the SCSI I_T Nexus to the emulated SAS Target Port 987 */ 988 transport_deregister_session(tl_nexus->se_sess); 989 tpg->tl_nexus = NULL; 990 kfree(tl_nexus); 991 return 0; 992 } 993 994 /* End items for tcm_loop_nexus_cit */ 995 996 static ssize_t tcm_loop_tpg_show_nexus( 997 struct se_portal_group *se_tpg, 998 char *page) 999 { 1000 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1001 struct tcm_loop_tpg, tl_se_tpg); 1002 struct tcm_loop_nexus *tl_nexus; 1003 ssize_t ret; 1004 1005 tl_nexus = tl_tpg->tl_nexus; 1006 if (!tl_nexus) 1007 return -ENODEV; 1008 1009 ret = snprintf(page, PAGE_SIZE, "%s\n", 1010 tl_nexus->se_sess->se_node_acl->initiatorname); 1011 1012 return ret; 1013 } 1014 1015 static ssize_t tcm_loop_tpg_store_nexus( 1016 struct se_portal_group *se_tpg, 1017 const char *page, 1018 size_t count) 1019 { 1020 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1021 struct tcm_loop_tpg, tl_se_tpg); 1022 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 1023 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; 1024 int ret; 1025 /* 1026 * Shutdown the active I_T nexus if 'NULL' is passed.. 1027 */ 1028 if (!strncmp(page, "NULL", 4)) { 1029 ret = tcm_loop_drop_nexus(tl_tpg); 1030 return (!ret) ? count : ret; 1031 } 1032 /* 1033 * Otherwise make sure the passed virtual Initiator port WWN matches 1034 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call 1035 * tcm_loop_make_nexus() 1036 */ 1037 if (strlen(page) >= TL_WWN_ADDR_LEN) { 1038 pr_err("Emulated NAA Sas Address: %s, exceeds" 1039 " max: %d\n", page, TL_WWN_ADDR_LEN); 1040 return -EINVAL; 1041 } 1042 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); 1043 1044 ptr = strstr(i_port, "naa."); 1045 if (ptr) { 1046 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { 1047 pr_err("Passed SAS Initiator Port %s does not" 1048 " match target port protoid: %s\n", i_port, 1049 tcm_loop_dump_proto_id(tl_hba)); 1050 return -EINVAL; 1051 } 1052 port_ptr = &i_port[0]; 1053 goto check_newline; 1054 } 1055 ptr = strstr(i_port, "fc."); 1056 if (ptr) { 1057 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { 1058 pr_err("Passed FCP Initiator Port %s does not" 1059 " match target port protoid: %s\n", i_port, 1060 tcm_loop_dump_proto_id(tl_hba)); 1061 return -EINVAL; 1062 } 1063 port_ptr = &i_port[3]; /* Skip over "fc." */ 1064 goto check_newline; 1065 } 1066 ptr = strstr(i_port, "iqn."); 1067 if (ptr) { 1068 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { 1069 pr_err("Passed iSCSI Initiator Port %s does not" 1070 " match target port protoid: %s\n", i_port, 1071 tcm_loop_dump_proto_id(tl_hba)); 1072 return -EINVAL; 1073 } 1074 port_ptr = &i_port[0]; 1075 goto check_newline; 1076 } 1077 pr_err("Unable to locate prefix for emulated Initiator Port:" 1078 " %s\n", i_port); 1079 return -EINVAL; 1080 /* 1081 * Clear any trailing newline for the NAA WWN 1082 */ 1083 check_newline: 1084 if (i_port[strlen(i_port)-1] == '\n') 1085 i_port[strlen(i_port)-1] = '\0'; 1086 1087 ret = tcm_loop_make_nexus(tl_tpg, port_ptr); 1088 if (ret < 0) 1089 return ret; 1090 1091 return count; 1092 } 1093 1094 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); 1095 1096 static ssize_t tcm_loop_tpg_show_transport_status( 1097 struct se_portal_group *se_tpg, 1098 char *page) 1099 { 1100 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1101 struct tcm_loop_tpg, tl_se_tpg); 1102 const char *status = NULL; 1103 ssize_t ret = -EINVAL; 1104 1105 switch (tl_tpg->tl_transport_status) { 1106 case TCM_TRANSPORT_ONLINE: 1107 status = "online"; 1108 break; 1109 case TCM_TRANSPORT_OFFLINE: 1110 status = "offline"; 1111 break; 1112 default: 1113 break; 1114 } 1115 1116 if (status) 1117 ret = snprintf(page, PAGE_SIZE, "%s\n", status); 1118 1119 return ret; 1120 } 1121 1122 static ssize_t tcm_loop_tpg_store_transport_status( 1123 struct se_portal_group *se_tpg, 1124 const char *page, 1125 size_t count) 1126 { 1127 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1128 struct tcm_loop_tpg, tl_se_tpg); 1129 1130 if (!strncmp(page, "online", 6)) { 1131 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; 1132 return count; 1133 } 1134 if (!strncmp(page, "offline", 7)) { 1135 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE; 1136 return count; 1137 } 1138 return -EINVAL; 1139 } 1140 1141 TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR); 1142 1143 static struct configfs_attribute *tcm_loop_tpg_attrs[] = { 1144 &tcm_loop_tpg_nexus.attr, 1145 &tcm_loop_tpg_transport_status.attr, 1146 NULL, 1147 }; 1148 1149 /* Start items for tcm_loop_naa_cit */ 1150 1151 static struct se_portal_group *tcm_loop_make_naa_tpg( 1152 struct se_wwn *wwn, 1153 struct config_group *group, 1154 const char *name) 1155 { 1156 struct tcm_loop_hba *tl_hba = container_of(wwn, 1157 struct tcm_loop_hba, tl_hba_wwn); 1158 struct tcm_loop_tpg *tl_tpg; 1159 int ret; 1160 unsigned long tpgt; 1161 1162 if (strstr(name, "tpgt_") != name) { 1163 pr_err("Unable to locate \"tpgt_#\" directory" 1164 " group\n"); 1165 return ERR_PTR(-EINVAL); 1166 } 1167 if (kstrtoul(name+5, 10, &tpgt)) 1168 return ERR_PTR(-EINVAL); 1169 1170 if (tpgt >= TL_TPGS_PER_HBA) { 1171 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA:" 1172 " %u\n", tpgt, TL_TPGS_PER_HBA); 1173 return ERR_PTR(-EINVAL); 1174 } 1175 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; 1176 tl_tpg->tl_hba = tl_hba; 1177 tl_tpg->tl_tpgt = tpgt; 1178 /* 1179 * Register the tl_tpg as a emulated SAS TCM Target Endpoint 1180 */ 1181 ret = core_tpg_register(&loop_ops, wwn, &tl_tpg->tl_se_tpg, 1182 tl_hba->tl_proto_id); 1183 if (ret < 0) 1184 return ERR_PTR(-ENOMEM); 1185 1186 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" 1187 " Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba), 1188 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1189 1190 return &tl_tpg->tl_se_tpg; 1191 } 1192 1193 static void tcm_loop_drop_naa_tpg( 1194 struct se_portal_group *se_tpg) 1195 { 1196 struct se_wwn *wwn = se_tpg->se_tpg_wwn; 1197 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1198 struct tcm_loop_tpg, tl_se_tpg); 1199 struct tcm_loop_hba *tl_hba; 1200 unsigned short tpgt; 1201 1202 tl_hba = tl_tpg->tl_hba; 1203 tpgt = tl_tpg->tl_tpgt; 1204 /* 1205 * Release the I_T Nexus for the Virtual SAS link if present 1206 */ 1207 tcm_loop_drop_nexus(tl_tpg); 1208 /* 1209 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint 1210 */ 1211 core_tpg_deregister(se_tpg); 1212 1213 tl_tpg->tl_hba = NULL; 1214 tl_tpg->tl_tpgt = 0; 1215 1216 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" 1217 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), 1218 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1219 } 1220 1221 /* End items for tcm_loop_naa_cit */ 1222 1223 /* Start items for tcm_loop_cit */ 1224 1225 static struct se_wwn *tcm_loop_make_scsi_hba( 1226 struct target_fabric_configfs *tf, 1227 struct config_group *group, 1228 const char *name) 1229 { 1230 struct tcm_loop_hba *tl_hba; 1231 struct Scsi_Host *sh; 1232 char *ptr; 1233 int ret, off = 0; 1234 1235 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); 1236 if (!tl_hba) { 1237 pr_err("Unable to allocate struct tcm_loop_hba\n"); 1238 return ERR_PTR(-ENOMEM); 1239 } 1240 /* 1241 * Determine the emulated Protocol Identifier and Target Port Name 1242 * based on the incoming configfs directory name. 1243 */ 1244 ptr = strstr(name, "naa."); 1245 if (ptr) { 1246 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; 1247 goto check_len; 1248 } 1249 ptr = strstr(name, "fc."); 1250 if (ptr) { 1251 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; 1252 off = 3; /* Skip over "fc." */ 1253 goto check_len; 1254 } 1255 ptr = strstr(name, "iqn."); 1256 if (!ptr) { 1257 pr_err("Unable to locate prefix for emulated Target " 1258 "Port: %s\n", name); 1259 ret = -EINVAL; 1260 goto out; 1261 } 1262 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; 1263 1264 check_len: 1265 if (strlen(name) >= TL_WWN_ADDR_LEN) { 1266 pr_err("Emulated NAA %s Address: %s, exceeds" 1267 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), 1268 TL_WWN_ADDR_LEN); 1269 ret = -EINVAL; 1270 goto out; 1271 } 1272 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); 1273 1274 /* 1275 * Call device_register(tl_hba->dev) to register the emulated 1276 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after 1277 * device_register() callbacks in tcm_loop_driver_probe() 1278 */ 1279 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); 1280 if (ret) 1281 goto out; 1282 1283 sh = tl_hba->sh; 1284 tcm_loop_hba_no_cnt++; 1285 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" 1286 " %s Address: %s at Linux/SCSI Host ID: %d\n", 1287 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); 1288 1289 return &tl_hba->tl_hba_wwn; 1290 out: 1291 kfree(tl_hba); 1292 return ERR_PTR(ret); 1293 } 1294 1295 static void tcm_loop_drop_scsi_hba( 1296 struct se_wwn *wwn) 1297 { 1298 struct tcm_loop_hba *tl_hba = container_of(wwn, 1299 struct tcm_loop_hba, tl_hba_wwn); 1300 1301 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target" 1302 " SAS Address: %s at Linux/SCSI Host ID: %d\n", 1303 tl_hba->tl_wwn_address, tl_hba->sh->host_no); 1304 /* 1305 * Call device_unregister() on the original tl_hba->dev. 1306 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will 1307 * release *tl_hba; 1308 */ 1309 device_unregister(&tl_hba->dev); 1310 } 1311 1312 /* Start items for tcm_loop_cit */ 1313 static ssize_t tcm_loop_wwn_show_attr_version( 1314 struct target_fabric_configfs *tf, 1315 char *page) 1316 { 1317 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); 1318 } 1319 1320 TF_WWN_ATTR_RO(tcm_loop, version); 1321 1322 static struct configfs_attribute *tcm_loop_wwn_attrs[] = { 1323 &tcm_loop_wwn_version.attr, 1324 NULL, 1325 }; 1326 1327 /* End items for tcm_loop_cit */ 1328 1329 static const struct target_core_fabric_ops loop_ops = { 1330 .module = THIS_MODULE, 1331 .name = "loopback", 1332 .get_fabric_name = tcm_loop_get_fabric_name, 1333 .tpg_get_wwn = tcm_loop_get_endpoint_wwn, 1334 .tpg_get_tag = tcm_loop_get_tag, 1335 .tpg_get_pr_transport_id = tcm_loop_get_pr_transport_id, 1336 .tpg_get_pr_transport_id_len = tcm_loop_get_pr_transport_id_len, 1337 .tpg_parse_pr_out_transport_id = tcm_loop_parse_pr_out_transport_id, 1338 .tpg_check_demo_mode = tcm_loop_check_demo_mode, 1339 .tpg_check_demo_mode_cache = tcm_loop_check_demo_mode_cache, 1340 .tpg_check_demo_mode_write_protect = 1341 tcm_loop_check_demo_mode_write_protect, 1342 .tpg_check_prod_mode_write_protect = 1343 tcm_loop_check_prod_mode_write_protect, 1344 .tpg_check_prot_fabric_only = tcm_loop_check_prot_fabric_only, 1345 .tpg_get_inst_index = tcm_loop_get_inst_index, 1346 .check_stop_free = tcm_loop_check_stop_free, 1347 .release_cmd = tcm_loop_release_cmd, 1348 .shutdown_session = tcm_loop_shutdown_session, 1349 .close_session = tcm_loop_close_session, 1350 .sess_get_index = tcm_loop_sess_get_index, 1351 .write_pending = tcm_loop_write_pending, 1352 .write_pending_status = tcm_loop_write_pending_status, 1353 .set_default_node_attributes = tcm_loop_set_default_node_attributes, 1354 .get_task_tag = tcm_loop_get_task_tag, 1355 .get_cmd_state = tcm_loop_get_cmd_state, 1356 .queue_data_in = tcm_loop_queue_data_in, 1357 .queue_status = tcm_loop_queue_status, 1358 .queue_tm_rsp = tcm_loop_queue_tm_rsp, 1359 .aborted_task = tcm_loop_aborted_task, 1360 .fabric_make_wwn = tcm_loop_make_scsi_hba, 1361 .fabric_drop_wwn = tcm_loop_drop_scsi_hba, 1362 .fabric_make_tpg = tcm_loop_make_naa_tpg, 1363 .fabric_drop_tpg = tcm_loop_drop_naa_tpg, 1364 .fabric_post_link = tcm_loop_port_link, 1365 .fabric_pre_unlink = tcm_loop_port_unlink, 1366 .tfc_wwn_attrs = tcm_loop_wwn_attrs, 1367 .tfc_tpg_base_attrs = tcm_loop_tpg_attrs, 1368 .tfc_tpg_attrib_attrs = tcm_loop_tpg_attrib_attrs, 1369 }; 1370 1371 static int __init tcm_loop_fabric_init(void) 1372 { 1373 int ret = -ENOMEM; 1374 1375 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0); 1376 if (!tcm_loop_workqueue) 1377 goto out; 1378 1379 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", 1380 sizeof(struct tcm_loop_cmd), 1381 __alignof__(struct tcm_loop_cmd), 1382 0, NULL); 1383 if (!tcm_loop_cmd_cache) { 1384 pr_debug("kmem_cache_create() for" 1385 " tcm_loop_cmd_cache failed\n"); 1386 goto out_destroy_workqueue; 1387 } 1388 1389 ret = tcm_loop_alloc_core_bus(); 1390 if (ret) 1391 goto out_destroy_cache; 1392 1393 ret = target_register_template(&loop_ops); 1394 if (ret) 1395 goto out_release_core_bus; 1396 1397 return 0; 1398 1399 out_release_core_bus: 1400 tcm_loop_release_core_bus(); 1401 out_destroy_cache: 1402 kmem_cache_destroy(tcm_loop_cmd_cache); 1403 out_destroy_workqueue: 1404 destroy_workqueue(tcm_loop_workqueue); 1405 out: 1406 return ret; 1407 } 1408 1409 static void __exit tcm_loop_fabric_exit(void) 1410 { 1411 target_unregister_template(&loop_ops); 1412 tcm_loop_release_core_bus(); 1413 kmem_cache_destroy(tcm_loop_cmd_cache); 1414 destroy_workqueue(tcm_loop_workqueue); 1415 } 1416 1417 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); 1418 MODULE_AUTHOR("Nicholas A. Bellinger <[email protected]>"); 1419 MODULE_LICENSE("GPL"); 1420 module_init(tcm_loop_fabric_init); 1421 module_exit(tcm_loop_fabric_exit); 1422