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 #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 /* Local pointer to allocated TCM configfs fabric module */ 45 static struct target_fabric_configfs *tcm_loop_fabric_configfs; 46 47 static struct workqueue_struct *tcm_loop_workqueue; 48 static struct kmem_cache *tcm_loop_cmd_cache; 49 50 static int tcm_loop_hba_no_cnt; 51 52 static int tcm_loop_queue_status(struct se_cmd *se_cmd); 53 54 /* 55 * Called from struct target_core_fabric_ops->check_stop_free() 56 */ 57 static int tcm_loop_check_stop_free(struct se_cmd *se_cmd) 58 { 59 /* 60 * Do not release struct se_cmd's containing a valid TMR 61 * pointer. These will be released directly in tcm_loop_device_reset() 62 * with transport_generic_free_cmd(). 63 */ 64 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 65 return 0; 66 /* 67 * Release the struct se_cmd, which will make a callback to release 68 * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd() 69 */ 70 transport_generic_free_cmd(se_cmd, 0); 71 return 1; 72 } 73 74 static void tcm_loop_release_cmd(struct se_cmd *se_cmd) 75 { 76 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 77 struct tcm_loop_cmd, tl_se_cmd); 78 79 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); 80 } 81 82 static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host) 83 { 84 seq_printf(m, "tcm_loop_proc_info()\n"); 85 return 0; 86 } 87 88 static int tcm_loop_driver_probe(struct device *); 89 static int tcm_loop_driver_remove(struct device *); 90 91 static int pseudo_lld_bus_match(struct device *dev, 92 struct device_driver *dev_driver) 93 { 94 return 1; 95 } 96 97 static struct bus_type tcm_loop_lld_bus = { 98 .name = "tcm_loop_bus", 99 .match = pseudo_lld_bus_match, 100 .probe = tcm_loop_driver_probe, 101 .remove = tcm_loop_driver_remove, 102 }; 103 104 static struct device_driver tcm_loop_driverfs = { 105 .name = "tcm_loop", 106 .bus = &tcm_loop_lld_bus, 107 }; 108 /* 109 * Used with root_device_register() in tcm_loop_alloc_core_bus() below 110 */ 111 struct device *tcm_loop_primary; 112 113 /* 114 * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and 115 * drivers/scsi/libiscsi.c:iscsi_change_queue_depth() 116 */ 117 static int tcm_loop_change_queue_depth( 118 struct scsi_device *sdev, 119 int depth, 120 int reason) 121 { 122 switch (reason) { 123 case SCSI_QDEPTH_DEFAULT: 124 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 125 break; 126 case SCSI_QDEPTH_QFULL: 127 scsi_track_queue_full(sdev, depth); 128 break; 129 case SCSI_QDEPTH_RAMP_UP: 130 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 131 break; 132 default: 133 return -EOPNOTSUPP; 134 } 135 return sdev->queue_depth; 136 } 137 138 static int tcm_loop_change_queue_type(struct scsi_device *sdev, int tag) 139 { 140 if (sdev->tagged_supported) { 141 scsi_set_tag_type(sdev, tag); 142 143 if (tag) 144 scsi_activate_tcq(sdev, sdev->queue_depth); 145 else 146 scsi_deactivate_tcq(sdev, sdev->queue_depth); 147 } else 148 tag = 0; 149 150 return tag; 151 } 152 153 /* 154 * Locate the SAM Task Attr from struct scsi_cmnd * 155 */ 156 static int tcm_loop_sam_attr(struct scsi_cmnd *sc) 157 { 158 if (sc->device->tagged_supported) { 159 switch (sc->tag) { 160 case HEAD_OF_QUEUE_TAG: 161 return MSG_HEAD_TAG; 162 case ORDERED_QUEUE_TAG: 163 return MSG_ORDERED_TAG; 164 default: 165 break; 166 } 167 } 168 169 return MSG_SIMPLE_TAG; 170 } 171 172 static void tcm_loop_submission_work(struct work_struct *work) 173 { 174 struct tcm_loop_cmd *tl_cmd = 175 container_of(work, struct tcm_loop_cmd, work); 176 struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd; 177 struct scsi_cmnd *sc = tl_cmd->sc; 178 struct tcm_loop_nexus *tl_nexus; 179 struct tcm_loop_hba *tl_hba; 180 struct tcm_loop_tpg *tl_tpg; 181 struct scatterlist *sgl_bidi = NULL; 182 u32 sgl_bidi_count = 0; 183 int rc; 184 185 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 186 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 187 188 /* 189 * Ensure that this tl_tpg reference from the incoming sc->device->id 190 * has already been configured via tcm_loop_make_naa_tpg(). 191 */ 192 if (!tl_tpg->tl_hba) { 193 set_host_byte(sc, DID_NO_CONNECT); 194 goto out_done; 195 } 196 if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) { 197 set_host_byte(sc, DID_TRANSPORT_DISRUPTED); 198 goto out_done; 199 } 200 tl_nexus = tl_hba->tl_nexus; 201 if (!tl_nexus) { 202 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus" 203 " does not exist\n"); 204 set_host_byte(sc, DID_ERROR); 205 goto out_done; 206 } 207 if (scsi_bidi_cmnd(sc)) { 208 struct scsi_data_buffer *sdb = scsi_in(sc); 209 210 sgl_bidi = sdb->table.sgl; 211 sgl_bidi_count = sdb->table.nents; 212 se_cmd->se_cmd_flags |= SCF_BIDI; 213 214 } 215 rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd, 216 &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun, 217 scsi_bufflen(sc), tcm_loop_sam_attr(sc), 218 sc->sc_data_direction, 0, 219 scsi_sglist(sc), scsi_sg_count(sc), 220 sgl_bidi, sgl_bidi_count, 221 scsi_prot_sglist(sc), scsi_prot_sg_count(sc)); 222 if (rc < 0) { 223 set_host_byte(sc, DID_NO_CONNECT); 224 goto out_done; 225 } 226 return; 227 228 out_done: 229 sc->scsi_done(sc); 230 return; 231 } 232 233 /* 234 * ->queuecommand can be and usually is called from interrupt context, so 235 * defer the actual submission to a workqueue. 236 */ 237 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc) 238 { 239 struct tcm_loop_cmd *tl_cmd; 240 241 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x" 242 " scsi_buf_len: %u\n", sc->device->host->host_no, 243 sc->device->id, sc->device->channel, sc->device->lun, 244 sc->cmnd[0], scsi_bufflen(sc)); 245 246 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC); 247 if (!tl_cmd) { 248 pr_err("Unable to allocate struct tcm_loop_cmd\n"); 249 set_host_byte(sc, DID_ERROR); 250 sc->scsi_done(sc); 251 return 0; 252 } 253 254 tl_cmd->sc = sc; 255 tl_cmd->sc_cmd_tag = sc->tag; 256 INIT_WORK(&tl_cmd->work, tcm_loop_submission_work); 257 queue_work(tcm_loop_workqueue, &tl_cmd->work); 258 return 0; 259 } 260 261 /* 262 * Called from SCSI EH process context to issue a LUN_RESET TMR 263 * to struct scsi_device 264 */ 265 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg, 266 struct tcm_loop_nexus *tl_nexus, 267 int lun, int task, enum tcm_tmreq_table tmr) 268 { 269 struct se_cmd *se_cmd = NULL; 270 struct se_session *se_sess; 271 struct se_portal_group *se_tpg; 272 struct tcm_loop_cmd *tl_cmd = NULL; 273 struct tcm_loop_tmr *tl_tmr = NULL; 274 int ret = TMR_FUNCTION_FAILED, rc; 275 276 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); 277 if (!tl_cmd) { 278 pr_err("Unable to allocate memory for tl_cmd\n"); 279 return ret; 280 } 281 282 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL); 283 if (!tl_tmr) { 284 pr_err("Unable to allocate memory for tl_tmr\n"); 285 goto release; 286 } 287 init_waitqueue_head(&tl_tmr->tl_tmr_wait); 288 289 se_cmd = &tl_cmd->tl_se_cmd; 290 se_tpg = &tl_tpg->tl_se_tpg; 291 se_sess = tl_nexus->se_sess; 292 /* 293 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 294 */ 295 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0, 296 DMA_NONE, MSG_SIMPLE_TAG, 297 &tl_cmd->tl_sense_buf[0]); 298 299 rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL); 300 if (rc < 0) 301 goto release; 302 303 if (tmr == TMR_ABORT_TASK) 304 se_cmd->se_tmr_req->ref_task_tag = task; 305 306 /* 307 * Locate the underlying TCM struct se_lun 308 */ 309 if (transport_lookup_tmr_lun(se_cmd, lun) < 0) { 310 ret = TMR_LUN_DOES_NOT_EXIST; 311 goto release; 312 } 313 /* 314 * Queue the TMR to TCM Core and sleep waiting for 315 * tcm_loop_queue_tm_rsp() to wake us up. 316 */ 317 transport_generic_handle_tmr(se_cmd); 318 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete)); 319 /* 320 * The TMR LUN_RESET has completed, check the response status and 321 * then release allocations. 322 */ 323 ret = se_cmd->se_tmr_req->response; 324 release: 325 if (se_cmd) 326 transport_generic_free_cmd(se_cmd, 1); 327 else 328 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); 329 kfree(tl_tmr); 330 return ret; 331 } 332 333 static int tcm_loop_abort_task(struct scsi_cmnd *sc) 334 { 335 struct tcm_loop_hba *tl_hba; 336 struct tcm_loop_nexus *tl_nexus; 337 struct tcm_loop_tpg *tl_tpg; 338 int ret = FAILED; 339 340 /* 341 * Locate the tcm_loop_hba_t pointer 342 */ 343 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 344 /* 345 * Locate the tl_nexus and se_sess pointers 346 */ 347 tl_nexus = tl_hba->tl_nexus; 348 if (!tl_nexus) { 349 pr_err("Unable to perform device reset without" 350 " active I_T Nexus\n"); 351 return FAILED; 352 } 353 354 /* 355 * Locate the tl_tpg pointer from TargetID in sc->device->id 356 */ 357 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 358 ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun, 359 sc->tag, TMR_ABORT_TASK); 360 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; 361 } 362 363 /* 364 * Called from SCSI EH process context to issue a LUN_RESET TMR 365 * to struct scsi_device 366 */ 367 static int tcm_loop_device_reset(struct scsi_cmnd *sc) 368 { 369 struct tcm_loop_hba *tl_hba; 370 struct tcm_loop_nexus *tl_nexus; 371 struct tcm_loop_tpg *tl_tpg; 372 int ret = FAILED; 373 374 /* 375 * Locate the tcm_loop_hba_t pointer 376 */ 377 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 378 /* 379 * Locate the tl_nexus and se_sess pointers 380 */ 381 tl_nexus = tl_hba->tl_nexus; 382 if (!tl_nexus) { 383 pr_err("Unable to perform device reset without" 384 " active I_T Nexus\n"); 385 return FAILED; 386 } 387 /* 388 * Locate the tl_tpg pointer from TargetID in sc->device->id 389 */ 390 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 391 ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun, 392 0, TMR_LUN_RESET); 393 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; 394 } 395 396 static int tcm_loop_target_reset(struct scsi_cmnd *sc) 397 { 398 struct tcm_loop_hba *tl_hba; 399 struct tcm_loop_tpg *tl_tpg; 400 401 /* 402 * Locate the tcm_loop_hba_t pointer 403 */ 404 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 405 if (!tl_hba) { 406 pr_err("Unable to perform device reset without" 407 " active I_T Nexus\n"); 408 return FAILED; 409 } 410 /* 411 * Locate the tl_tpg pointer from TargetID in sc->device->id 412 */ 413 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 414 if (tl_tpg) { 415 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; 416 return SUCCESS; 417 } 418 return FAILED; 419 } 420 421 static int tcm_loop_slave_alloc(struct scsi_device *sd) 422 { 423 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags); 424 return 0; 425 } 426 427 static int tcm_loop_slave_configure(struct scsi_device *sd) 428 { 429 if (sd->tagged_supported) { 430 scsi_activate_tcq(sd, sd->queue_depth); 431 scsi_adjust_queue_depth(sd, MSG_SIMPLE_TAG, 432 sd->host->cmd_per_lun); 433 } else { 434 scsi_adjust_queue_depth(sd, 0, 435 sd->host->cmd_per_lun); 436 } 437 438 return 0; 439 } 440 441 static struct scsi_host_template tcm_loop_driver_template = { 442 .show_info = tcm_loop_show_info, 443 .proc_name = "tcm_loopback", 444 .name = "TCM_Loopback", 445 .queuecommand = tcm_loop_queuecommand, 446 .change_queue_depth = tcm_loop_change_queue_depth, 447 .change_queue_type = tcm_loop_change_queue_type, 448 .eh_abort_handler = tcm_loop_abort_task, 449 .eh_device_reset_handler = tcm_loop_device_reset, 450 .eh_target_reset_handler = tcm_loop_target_reset, 451 .can_queue = 1024, 452 .this_id = -1, 453 .sg_tablesize = 256, 454 .cmd_per_lun = 1024, 455 .max_sectors = 0xFFFF, 456 .use_clustering = DISABLE_CLUSTERING, 457 .slave_alloc = tcm_loop_slave_alloc, 458 .slave_configure = tcm_loop_slave_configure, 459 .module = THIS_MODULE, 460 }; 461 462 static int tcm_loop_driver_probe(struct device *dev) 463 { 464 struct tcm_loop_hba *tl_hba; 465 struct Scsi_Host *sh; 466 int error, host_prot; 467 468 tl_hba = to_tcm_loop_hba(dev); 469 470 sh = scsi_host_alloc(&tcm_loop_driver_template, 471 sizeof(struct tcm_loop_hba)); 472 if (!sh) { 473 pr_err("Unable to allocate struct scsi_host\n"); 474 return -ENODEV; 475 } 476 tl_hba->sh = sh; 477 478 /* 479 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata 480 */ 481 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba; 482 /* 483 * Setup single ID, Channel and LUN for now.. 484 */ 485 sh->max_id = 2; 486 sh->max_lun = 0; 487 sh->max_channel = 0; 488 sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN; 489 490 host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | 491 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | 492 SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; 493 494 scsi_host_set_prot(sh, host_prot); 495 scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC); 496 497 error = scsi_add_host(sh, &tl_hba->dev); 498 if (error) { 499 pr_err("%s: scsi_add_host failed\n", __func__); 500 scsi_host_put(sh); 501 return -ENODEV; 502 } 503 return 0; 504 } 505 506 static int tcm_loop_driver_remove(struct device *dev) 507 { 508 struct tcm_loop_hba *tl_hba; 509 struct Scsi_Host *sh; 510 511 tl_hba = to_tcm_loop_hba(dev); 512 sh = tl_hba->sh; 513 514 scsi_remove_host(sh); 515 scsi_host_put(sh); 516 return 0; 517 } 518 519 static void tcm_loop_release_adapter(struct device *dev) 520 { 521 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev); 522 523 kfree(tl_hba); 524 } 525 526 /* 527 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c 528 */ 529 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id) 530 { 531 int ret; 532 533 tl_hba->dev.bus = &tcm_loop_lld_bus; 534 tl_hba->dev.parent = tcm_loop_primary; 535 tl_hba->dev.release = &tcm_loop_release_adapter; 536 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id); 537 538 ret = device_register(&tl_hba->dev); 539 if (ret) { 540 pr_err("device_register() failed for" 541 " tl_hba->dev: %d\n", ret); 542 return -ENODEV; 543 } 544 545 return 0; 546 } 547 548 /* 549 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated 550 * tcm_loop SCSI bus. 551 */ 552 static int tcm_loop_alloc_core_bus(void) 553 { 554 int ret; 555 556 tcm_loop_primary = root_device_register("tcm_loop_0"); 557 if (IS_ERR(tcm_loop_primary)) { 558 pr_err("Unable to allocate tcm_loop_primary\n"); 559 return PTR_ERR(tcm_loop_primary); 560 } 561 562 ret = bus_register(&tcm_loop_lld_bus); 563 if (ret) { 564 pr_err("bus_register() failed for tcm_loop_lld_bus\n"); 565 goto dev_unreg; 566 } 567 568 ret = driver_register(&tcm_loop_driverfs); 569 if (ret) { 570 pr_err("driver_register() failed for" 571 "tcm_loop_driverfs\n"); 572 goto bus_unreg; 573 } 574 575 pr_debug("Initialized TCM Loop Core Bus\n"); 576 return ret; 577 578 bus_unreg: 579 bus_unregister(&tcm_loop_lld_bus); 580 dev_unreg: 581 root_device_unregister(tcm_loop_primary); 582 return ret; 583 } 584 585 static void tcm_loop_release_core_bus(void) 586 { 587 driver_unregister(&tcm_loop_driverfs); 588 bus_unregister(&tcm_loop_lld_bus); 589 root_device_unregister(tcm_loop_primary); 590 591 pr_debug("Releasing TCM Loop Core BUS\n"); 592 } 593 594 static char *tcm_loop_get_fabric_name(void) 595 { 596 return "loopback"; 597 } 598 599 static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg) 600 { 601 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 602 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 603 /* 604 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba() 605 * time based on the protocol dependent prefix of the passed configfs group. 606 * 607 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric 608 * ProtocolID using target_core_fabric_lib.c symbols. 609 */ 610 switch (tl_hba->tl_proto_id) { 611 case SCSI_PROTOCOL_SAS: 612 return sas_get_fabric_proto_ident(se_tpg); 613 case SCSI_PROTOCOL_FCP: 614 return fc_get_fabric_proto_ident(se_tpg); 615 case SCSI_PROTOCOL_ISCSI: 616 return iscsi_get_fabric_proto_ident(se_tpg); 617 default: 618 pr_err("Unknown tl_proto_id: 0x%02x, using" 619 " SAS emulation\n", tl_hba->tl_proto_id); 620 break; 621 } 622 623 return sas_get_fabric_proto_ident(se_tpg); 624 } 625 626 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg) 627 { 628 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 629 /* 630 * Return the passed NAA identifier for the SAS Target Port 631 */ 632 return &tl_tpg->tl_hba->tl_wwn_address[0]; 633 } 634 635 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg) 636 { 637 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 638 /* 639 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 640 * to represent the SCSI Target Port. 641 */ 642 return tl_tpg->tl_tpgt; 643 } 644 645 static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg) 646 { 647 return 1; 648 } 649 650 static u32 tcm_loop_get_pr_transport_id( 651 struct se_portal_group *se_tpg, 652 struct se_node_acl *se_nacl, 653 struct t10_pr_registration *pr_reg, 654 int *format_code, 655 unsigned char *buf) 656 { 657 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 658 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 659 660 switch (tl_hba->tl_proto_id) { 661 case SCSI_PROTOCOL_SAS: 662 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 663 format_code, buf); 664 case SCSI_PROTOCOL_FCP: 665 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 666 format_code, buf); 667 case SCSI_PROTOCOL_ISCSI: 668 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 669 format_code, buf); 670 default: 671 pr_err("Unknown tl_proto_id: 0x%02x, using" 672 " SAS emulation\n", tl_hba->tl_proto_id); 673 break; 674 } 675 676 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 677 format_code, buf); 678 } 679 680 static u32 tcm_loop_get_pr_transport_id_len( 681 struct se_portal_group *se_tpg, 682 struct se_node_acl *se_nacl, 683 struct t10_pr_registration *pr_reg, 684 int *format_code) 685 { 686 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 687 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 688 689 switch (tl_hba->tl_proto_id) { 690 case SCSI_PROTOCOL_SAS: 691 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 692 format_code); 693 case SCSI_PROTOCOL_FCP: 694 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 695 format_code); 696 case SCSI_PROTOCOL_ISCSI: 697 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 698 format_code); 699 default: 700 pr_err("Unknown tl_proto_id: 0x%02x, using" 701 " SAS emulation\n", tl_hba->tl_proto_id); 702 break; 703 } 704 705 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 706 format_code); 707 } 708 709 /* 710 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above 711 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. 712 */ 713 static char *tcm_loop_parse_pr_out_transport_id( 714 struct se_portal_group *se_tpg, 715 const char *buf, 716 u32 *out_tid_len, 717 char **port_nexus_ptr) 718 { 719 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 720 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 721 722 switch (tl_hba->tl_proto_id) { 723 case SCSI_PROTOCOL_SAS: 724 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 725 port_nexus_ptr); 726 case SCSI_PROTOCOL_FCP: 727 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 728 port_nexus_ptr); 729 case SCSI_PROTOCOL_ISCSI: 730 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 731 port_nexus_ptr); 732 default: 733 pr_err("Unknown tl_proto_id: 0x%02x, using" 734 " SAS emulation\n", tl_hba->tl_proto_id); 735 break; 736 } 737 738 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 739 port_nexus_ptr); 740 } 741 742 /* 743 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated 744 * based upon the incoming fabric dependent SCSI Initiator Port 745 */ 746 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) 747 { 748 return 1; 749 } 750 751 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) 752 { 753 return 0; 754 } 755 756 /* 757 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for 758 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest 759 */ 760 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) 761 { 762 return 0; 763 } 764 765 /* 766 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will 767 * never be called for TCM_Loop by target_core_fabric_configfs.c code. 768 * It has been added here as a nop for target_fabric_tf_ops_check() 769 */ 770 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) 771 { 772 return 0; 773 } 774 775 static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl( 776 struct se_portal_group *se_tpg) 777 { 778 struct tcm_loop_nacl *tl_nacl; 779 780 tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL); 781 if (!tl_nacl) { 782 pr_err("Unable to allocate struct tcm_loop_nacl\n"); 783 return NULL; 784 } 785 786 return &tl_nacl->se_node_acl; 787 } 788 789 static void tcm_loop_tpg_release_fabric_acl( 790 struct se_portal_group *se_tpg, 791 struct se_node_acl *se_nacl) 792 { 793 struct tcm_loop_nacl *tl_nacl = container_of(se_nacl, 794 struct tcm_loop_nacl, se_node_acl); 795 796 kfree(tl_nacl); 797 } 798 799 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) 800 { 801 return 1; 802 } 803 804 static u32 tcm_loop_sess_get_index(struct se_session *se_sess) 805 { 806 return 1; 807 } 808 809 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) 810 { 811 return; 812 } 813 814 static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd) 815 { 816 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 817 struct tcm_loop_cmd, tl_se_cmd); 818 819 return tl_cmd->sc_cmd_tag; 820 } 821 822 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) 823 { 824 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 825 struct tcm_loop_cmd, tl_se_cmd); 826 827 return tl_cmd->sc_cmd_state; 828 } 829 830 static int tcm_loop_shutdown_session(struct se_session *se_sess) 831 { 832 return 0; 833 } 834 835 static void tcm_loop_close_session(struct se_session *se_sess) 836 { 837 return; 838 }; 839 840 static int tcm_loop_write_pending(struct se_cmd *se_cmd) 841 { 842 /* 843 * Since Linux/SCSI has already sent down a struct scsi_cmnd 844 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array 845 * memory, and memory has already been mapped to struct se_cmd->t_mem_list 846 * format with transport_generic_map_mem_to_cmd(). 847 * 848 * We now tell TCM to add this WRITE CDB directly into the TCM storage 849 * object execution queue. 850 */ 851 target_execute_cmd(se_cmd); 852 return 0; 853 } 854 855 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) 856 { 857 return 0; 858 } 859 860 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) 861 { 862 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 863 struct tcm_loop_cmd, tl_se_cmd); 864 struct scsi_cmnd *sc = tl_cmd->sc; 865 866 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" 867 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 868 869 sc->result = SAM_STAT_GOOD; 870 set_host_byte(sc, DID_OK); 871 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 872 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 873 scsi_set_resid(sc, se_cmd->residual_count); 874 sc->scsi_done(sc); 875 return 0; 876 } 877 878 static int tcm_loop_queue_status(struct se_cmd *se_cmd) 879 { 880 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 881 struct tcm_loop_cmd, tl_se_cmd); 882 struct scsi_cmnd *sc = tl_cmd->sc; 883 884 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" 885 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 886 887 if (se_cmd->sense_buffer && 888 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 889 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 890 891 memcpy(sc->sense_buffer, se_cmd->sense_buffer, 892 SCSI_SENSE_BUFFERSIZE); 893 sc->result = SAM_STAT_CHECK_CONDITION; 894 set_driver_byte(sc, DRIVER_SENSE); 895 } else 896 sc->result = se_cmd->scsi_status; 897 898 set_host_byte(sc, DID_OK); 899 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 900 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 901 scsi_set_resid(sc, se_cmd->residual_count); 902 sc->scsi_done(sc); 903 return 0; 904 } 905 906 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) 907 { 908 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; 909 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; 910 /* 911 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead 912 * and wake up the wait_queue_head_t in tcm_loop_device_reset() 913 */ 914 atomic_set(&tl_tmr->tmr_complete, 1); 915 wake_up(&tl_tmr->tl_tmr_wait); 916 } 917 918 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) 919 { 920 switch (tl_hba->tl_proto_id) { 921 case SCSI_PROTOCOL_SAS: 922 return "SAS"; 923 case SCSI_PROTOCOL_FCP: 924 return "FCP"; 925 case SCSI_PROTOCOL_ISCSI: 926 return "iSCSI"; 927 default: 928 break; 929 } 930 931 return "Unknown"; 932 } 933 934 /* Start items for tcm_loop_port_cit */ 935 936 static int tcm_loop_port_link( 937 struct se_portal_group *se_tpg, 938 struct se_lun *lun) 939 { 940 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 941 struct tcm_loop_tpg, tl_se_tpg); 942 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 943 944 atomic_inc(&tl_tpg->tl_tpg_port_count); 945 smp_mb__after_atomic_inc(); 946 /* 947 * Add Linux/SCSI struct scsi_device by HCTL 948 */ 949 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); 950 951 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); 952 return 0; 953 } 954 955 static void tcm_loop_port_unlink( 956 struct se_portal_group *se_tpg, 957 struct se_lun *se_lun) 958 { 959 struct scsi_device *sd; 960 struct tcm_loop_hba *tl_hba; 961 struct tcm_loop_tpg *tl_tpg; 962 963 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); 964 tl_hba = tl_tpg->tl_hba; 965 966 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, 967 se_lun->unpacked_lun); 968 if (!sd) { 969 pr_err("Unable to locate struct scsi_device for %d:%d:" 970 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); 971 return; 972 } 973 /* 974 * Remove Linux/SCSI struct scsi_device by HCTL 975 */ 976 scsi_remove_device(sd); 977 scsi_device_put(sd); 978 979 atomic_dec(&tl_tpg->tl_tpg_port_count); 980 smp_mb__after_atomic_dec(); 981 982 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); 983 } 984 985 /* End items for tcm_loop_port_cit */ 986 987 /* Start items for tcm_loop_nexus_cit */ 988 989 static int tcm_loop_make_nexus( 990 struct tcm_loop_tpg *tl_tpg, 991 const char *name) 992 { 993 struct se_portal_group *se_tpg; 994 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 995 struct tcm_loop_nexus *tl_nexus; 996 int ret = -ENOMEM; 997 998 if (tl_tpg->tl_hba->tl_nexus) { 999 pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n"); 1000 return -EEXIST; 1001 } 1002 se_tpg = &tl_tpg->tl_se_tpg; 1003 1004 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); 1005 if (!tl_nexus) { 1006 pr_err("Unable to allocate struct tcm_loop_nexus\n"); 1007 return -ENOMEM; 1008 } 1009 /* 1010 * Initialize the struct se_session pointer 1011 */ 1012 tl_nexus->se_sess = transport_init_session(); 1013 if (IS_ERR(tl_nexus->se_sess)) { 1014 ret = PTR_ERR(tl_nexus->se_sess); 1015 goto out; 1016 } 1017 /* 1018 * Since we are running in 'demo mode' this call with generate a 1019 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI 1020 * Initiator port name of the passed configfs group 'name'. 1021 */ 1022 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1023 se_tpg, (unsigned char *)name); 1024 if (!tl_nexus->se_sess->se_node_acl) { 1025 transport_free_session(tl_nexus->se_sess); 1026 goto out; 1027 } 1028 /* 1029 * Now, register the SAS I_T Nexus as active with the call to 1030 * transport_register_session() 1031 */ 1032 __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, 1033 tl_nexus->se_sess, tl_nexus); 1034 tl_tpg->tl_hba->tl_nexus = tl_nexus; 1035 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" 1036 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), 1037 name); 1038 return 0; 1039 1040 out: 1041 kfree(tl_nexus); 1042 return ret; 1043 } 1044 1045 static int tcm_loop_drop_nexus( 1046 struct tcm_loop_tpg *tpg) 1047 { 1048 struct se_session *se_sess; 1049 struct tcm_loop_nexus *tl_nexus; 1050 struct tcm_loop_hba *tl_hba = tpg->tl_hba; 1051 1052 if (!tl_hba) 1053 return -ENODEV; 1054 1055 tl_nexus = tl_hba->tl_nexus; 1056 if (!tl_nexus) 1057 return -ENODEV; 1058 1059 se_sess = tl_nexus->se_sess; 1060 if (!se_sess) 1061 return -ENODEV; 1062 1063 if (atomic_read(&tpg->tl_tpg_port_count)) { 1064 pr_err("Unable to remove TCM_Loop I_T Nexus with" 1065 " active TPG port count: %d\n", 1066 atomic_read(&tpg->tl_tpg_port_count)); 1067 return -EPERM; 1068 } 1069 1070 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" 1071 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), 1072 tl_nexus->se_sess->se_node_acl->initiatorname); 1073 /* 1074 * Release the SCSI I_T Nexus to the emulated SAS Target Port 1075 */ 1076 transport_deregister_session(tl_nexus->se_sess); 1077 tpg->tl_hba->tl_nexus = NULL; 1078 kfree(tl_nexus); 1079 return 0; 1080 } 1081 1082 /* End items for tcm_loop_nexus_cit */ 1083 1084 static ssize_t tcm_loop_tpg_show_nexus( 1085 struct se_portal_group *se_tpg, 1086 char *page) 1087 { 1088 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1089 struct tcm_loop_tpg, tl_se_tpg); 1090 struct tcm_loop_nexus *tl_nexus; 1091 ssize_t ret; 1092 1093 tl_nexus = tl_tpg->tl_hba->tl_nexus; 1094 if (!tl_nexus) 1095 return -ENODEV; 1096 1097 ret = snprintf(page, PAGE_SIZE, "%s\n", 1098 tl_nexus->se_sess->se_node_acl->initiatorname); 1099 1100 return ret; 1101 } 1102 1103 static ssize_t tcm_loop_tpg_store_nexus( 1104 struct se_portal_group *se_tpg, 1105 const char *page, 1106 size_t count) 1107 { 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 = tl_tpg->tl_hba; 1111 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; 1112 int ret; 1113 /* 1114 * Shutdown the active I_T nexus if 'NULL' is passed.. 1115 */ 1116 if (!strncmp(page, "NULL", 4)) { 1117 ret = tcm_loop_drop_nexus(tl_tpg); 1118 return (!ret) ? count : ret; 1119 } 1120 /* 1121 * Otherwise make sure the passed virtual Initiator port WWN matches 1122 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call 1123 * tcm_loop_make_nexus() 1124 */ 1125 if (strlen(page) >= TL_WWN_ADDR_LEN) { 1126 pr_err("Emulated NAA Sas Address: %s, exceeds" 1127 " max: %d\n", page, TL_WWN_ADDR_LEN); 1128 return -EINVAL; 1129 } 1130 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); 1131 1132 ptr = strstr(i_port, "naa."); 1133 if (ptr) { 1134 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { 1135 pr_err("Passed SAS Initiator Port %s does not" 1136 " match target port protoid: %s\n", i_port, 1137 tcm_loop_dump_proto_id(tl_hba)); 1138 return -EINVAL; 1139 } 1140 port_ptr = &i_port[0]; 1141 goto check_newline; 1142 } 1143 ptr = strstr(i_port, "fc."); 1144 if (ptr) { 1145 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { 1146 pr_err("Passed FCP Initiator Port %s does not" 1147 " match target port protoid: %s\n", i_port, 1148 tcm_loop_dump_proto_id(tl_hba)); 1149 return -EINVAL; 1150 } 1151 port_ptr = &i_port[3]; /* Skip over "fc." */ 1152 goto check_newline; 1153 } 1154 ptr = strstr(i_port, "iqn."); 1155 if (ptr) { 1156 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { 1157 pr_err("Passed iSCSI Initiator Port %s does not" 1158 " match target port protoid: %s\n", i_port, 1159 tcm_loop_dump_proto_id(tl_hba)); 1160 return -EINVAL; 1161 } 1162 port_ptr = &i_port[0]; 1163 goto check_newline; 1164 } 1165 pr_err("Unable to locate prefix for emulated Initiator Port:" 1166 " %s\n", i_port); 1167 return -EINVAL; 1168 /* 1169 * Clear any trailing newline for the NAA WWN 1170 */ 1171 check_newline: 1172 if (i_port[strlen(i_port)-1] == '\n') 1173 i_port[strlen(i_port)-1] = '\0'; 1174 1175 ret = tcm_loop_make_nexus(tl_tpg, port_ptr); 1176 if (ret < 0) 1177 return ret; 1178 1179 return count; 1180 } 1181 1182 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); 1183 1184 static ssize_t tcm_loop_tpg_show_transport_status( 1185 struct se_portal_group *se_tpg, 1186 char *page) 1187 { 1188 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1189 struct tcm_loop_tpg, tl_se_tpg); 1190 const char *status = NULL; 1191 ssize_t ret = -EINVAL; 1192 1193 switch (tl_tpg->tl_transport_status) { 1194 case TCM_TRANSPORT_ONLINE: 1195 status = "online"; 1196 break; 1197 case TCM_TRANSPORT_OFFLINE: 1198 status = "offline"; 1199 break; 1200 default: 1201 break; 1202 } 1203 1204 if (status) 1205 ret = snprintf(page, PAGE_SIZE, "%s\n", status); 1206 1207 return ret; 1208 } 1209 1210 static ssize_t tcm_loop_tpg_store_transport_status( 1211 struct se_portal_group *se_tpg, 1212 const char *page, 1213 size_t count) 1214 { 1215 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1216 struct tcm_loop_tpg, tl_se_tpg); 1217 1218 if (!strncmp(page, "online", 6)) { 1219 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; 1220 return count; 1221 } 1222 if (!strncmp(page, "offline", 7)) { 1223 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE; 1224 return count; 1225 } 1226 return -EINVAL; 1227 } 1228 1229 TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR); 1230 1231 static struct configfs_attribute *tcm_loop_tpg_attrs[] = { 1232 &tcm_loop_tpg_nexus.attr, 1233 &tcm_loop_tpg_transport_status.attr, 1234 NULL, 1235 }; 1236 1237 /* Start items for tcm_loop_naa_cit */ 1238 1239 static struct se_portal_group *tcm_loop_make_naa_tpg( 1240 struct se_wwn *wwn, 1241 struct config_group *group, 1242 const char *name) 1243 { 1244 struct tcm_loop_hba *tl_hba = container_of(wwn, 1245 struct tcm_loop_hba, tl_hba_wwn); 1246 struct tcm_loop_tpg *tl_tpg; 1247 char *tpgt_str, *end_ptr; 1248 int ret; 1249 unsigned short int tpgt; 1250 1251 tpgt_str = strstr(name, "tpgt_"); 1252 if (!tpgt_str) { 1253 pr_err("Unable to locate \"tpgt_#\" directory" 1254 " group\n"); 1255 return ERR_PTR(-EINVAL); 1256 } 1257 tpgt_str += 5; /* Skip ahead of "tpgt_" */ 1258 tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0); 1259 1260 if (tpgt >= TL_TPGS_PER_HBA) { 1261 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:" 1262 " %u\n", tpgt, TL_TPGS_PER_HBA); 1263 return ERR_PTR(-EINVAL); 1264 } 1265 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; 1266 tl_tpg->tl_hba = tl_hba; 1267 tl_tpg->tl_tpgt = tpgt; 1268 /* 1269 * Register the tl_tpg as a emulated SAS TCM Target Endpoint 1270 */ 1271 ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops, 1272 wwn, &tl_tpg->tl_se_tpg, tl_tpg, 1273 TRANSPORT_TPG_TYPE_NORMAL); 1274 if (ret < 0) 1275 return ERR_PTR(-ENOMEM); 1276 1277 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" 1278 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), 1279 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1280 1281 return &tl_tpg->tl_se_tpg; 1282 } 1283 1284 static void tcm_loop_drop_naa_tpg( 1285 struct se_portal_group *se_tpg) 1286 { 1287 struct se_wwn *wwn = se_tpg->se_tpg_wwn; 1288 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1289 struct tcm_loop_tpg, tl_se_tpg); 1290 struct tcm_loop_hba *tl_hba; 1291 unsigned short tpgt; 1292 1293 tl_hba = tl_tpg->tl_hba; 1294 tpgt = tl_tpg->tl_tpgt; 1295 /* 1296 * Release the I_T Nexus for the Virtual SAS link if present 1297 */ 1298 tcm_loop_drop_nexus(tl_tpg); 1299 /* 1300 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint 1301 */ 1302 core_tpg_deregister(se_tpg); 1303 1304 tl_tpg->tl_hba = NULL; 1305 tl_tpg->tl_tpgt = 0; 1306 1307 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" 1308 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), 1309 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1310 } 1311 1312 /* End items for tcm_loop_naa_cit */ 1313 1314 /* Start items for tcm_loop_cit */ 1315 1316 static struct se_wwn *tcm_loop_make_scsi_hba( 1317 struct target_fabric_configfs *tf, 1318 struct config_group *group, 1319 const char *name) 1320 { 1321 struct tcm_loop_hba *tl_hba; 1322 struct Scsi_Host *sh; 1323 char *ptr; 1324 int ret, off = 0; 1325 1326 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); 1327 if (!tl_hba) { 1328 pr_err("Unable to allocate struct tcm_loop_hba\n"); 1329 return ERR_PTR(-ENOMEM); 1330 } 1331 /* 1332 * Determine the emulated Protocol Identifier and Target Port Name 1333 * based on the incoming configfs directory name. 1334 */ 1335 ptr = strstr(name, "naa."); 1336 if (ptr) { 1337 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; 1338 goto check_len; 1339 } 1340 ptr = strstr(name, "fc."); 1341 if (ptr) { 1342 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; 1343 off = 3; /* Skip over "fc." */ 1344 goto check_len; 1345 } 1346 ptr = strstr(name, "iqn."); 1347 if (!ptr) { 1348 pr_err("Unable to locate prefix for emulated Target " 1349 "Port: %s\n", name); 1350 ret = -EINVAL; 1351 goto out; 1352 } 1353 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; 1354 1355 check_len: 1356 if (strlen(name) >= TL_WWN_ADDR_LEN) { 1357 pr_err("Emulated NAA %s Address: %s, exceeds" 1358 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), 1359 TL_WWN_ADDR_LEN); 1360 ret = -EINVAL; 1361 goto out; 1362 } 1363 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); 1364 1365 /* 1366 * Call device_register(tl_hba->dev) to register the emulated 1367 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after 1368 * device_register() callbacks in tcm_loop_driver_probe() 1369 */ 1370 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); 1371 if (ret) 1372 goto out; 1373 1374 sh = tl_hba->sh; 1375 tcm_loop_hba_no_cnt++; 1376 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" 1377 " %s Address: %s at Linux/SCSI Host ID: %d\n", 1378 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); 1379 1380 return &tl_hba->tl_hba_wwn; 1381 out: 1382 kfree(tl_hba); 1383 return ERR_PTR(ret); 1384 } 1385 1386 static void tcm_loop_drop_scsi_hba( 1387 struct se_wwn *wwn) 1388 { 1389 struct tcm_loop_hba *tl_hba = container_of(wwn, 1390 struct tcm_loop_hba, tl_hba_wwn); 1391 1392 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target" 1393 " SAS Address: %s at Linux/SCSI Host ID: %d\n", 1394 tl_hba->tl_wwn_address, tl_hba->sh->host_no); 1395 /* 1396 * Call device_unregister() on the original tl_hba->dev. 1397 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will 1398 * release *tl_hba; 1399 */ 1400 device_unregister(&tl_hba->dev); 1401 } 1402 1403 /* Start items for tcm_loop_cit */ 1404 static ssize_t tcm_loop_wwn_show_attr_version( 1405 struct target_fabric_configfs *tf, 1406 char *page) 1407 { 1408 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); 1409 } 1410 1411 TF_WWN_ATTR_RO(tcm_loop, version); 1412 1413 static struct configfs_attribute *tcm_loop_wwn_attrs[] = { 1414 &tcm_loop_wwn_version.attr, 1415 NULL, 1416 }; 1417 1418 /* End items for tcm_loop_cit */ 1419 1420 static int tcm_loop_register_configfs(void) 1421 { 1422 struct target_fabric_configfs *fabric; 1423 int ret; 1424 /* 1425 * Set the TCM Loop HBA counter to zero 1426 */ 1427 tcm_loop_hba_no_cnt = 0; 1428 /* 1429 * Register the top level struct config_item_type with TCM core 1430 */ 1431 fabric = target_fabric_configfs_init(THIS_MODULE, "loopback"); 1432 if (IS_ERR(fabric)) { 1433 pr_err("tcm_loop_register_configfs() failed!\n"); 1434 return PTR_ERR(fabric); 1435 } 1436 /* 1437 * Setup the fabric API of function pointers used by target_core_mod 1438 */ 1439 fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name; 1440 fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident; 1441 fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn; 1442 fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag; 1443 fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth; 1444 fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id; 1445 fabric->tf_ops.tpg_get_pr_transport_id_len = 1446 &tcm_loop_get_pr_transport_id_len; 1447 fabric->tf_ops.tpg_parse_pr_out_transport_id = 1448 &tcm_loop_parse_pr_out_transport_id; 1449 fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode; 1450 fabric->tf_ops.tpg_check_demo_mode_cache = 1451 &tcm_loop_check_demo_mode_cache; 1452 fabric->tf_ops.tpg_check_demo_mode_write_protect = 1453 &tcm_loop_check_demo_mode_write_protect; 1454 fabric->tf_ops.tpg_check_prod_mode_write_protect = 1455 &tcm_loop_check_prod_mode_write_protect; 1456 /* 1457 * The TCM loopback fabric module runs in demo-mode to a local 1458 * virtual SCSI device, so fabric dependent initator ACLs are 1459 * not required. 1460 */ 1461 fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl; 1462 fabric->tf_ops.tpg_release_fabric_acl = 1463 &tcm_loop_tpg_release_fabric_acl; 1464 fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index; 1465 /* 1466 * Used for setting up remaining TCM resources in process context 1467 */ 1468 fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free; 1469 fabric->tf_ops.release_cmd = &tcm_loop_release_cmd; 1470 fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session; 1471 fabric->tf_ops.close_session = &tcm_loop_close_session; 1472 fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index; 1473 fabric->tf_ops.sess_get_initiator_sid = NULL; 1474 fabric->tf_ops.write_pending = &tcm_loop_write_pending; 1475 fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status; 1476 /* 1477 * Not used for TCM loopback 1478 */ 1479 fabric->tf_ops.set_default_node_attributes = 1480 &tcm_loop_set_default_node_attributes; 1481 fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag; 1482 fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state; 1483 fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in; 1484 fabric->tf_ops.queue_status = &tcm_loop_queue_status; 1485 fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp; 1486 1487 /* 1488 * Setup function pointers for generic logic in target_core_fabric_configfs.c 1489 */ 1490 fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba; 1491 fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba; 1492 fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg; 1493 fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg; 1494 /* 1495 * fabric_post_link() and fabric_pre_unlink() are used for 1496 * registration and release of TCM Loop Virtual SCSI LUNs. 1497 */ 1498 fabric->tf_ops.fabric_post_link = &tcm_loop_port_link; 1499 fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink; 1500 fabric->tf_ops.fabric_make_np = NULL; 1501 fabric->tf_ops.fabric_drop_np = NULL; 1502 /* 1503 * Setup default attribute lists for various fabric->tf_cit_tmpl 1504 */ 1505 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs; 1506 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs; 1507 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL; 1508 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL; 1509 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL; 1510 /* 1511 * Once fabric->tf_ops has been setup, now register the fabric for 1512 * use within TCM 1513 */ 1514 ret = target_fabric_configfs_register(fabric); 1515 if (ret < 0) { 1516 pr_err("target_fabric_configfs_register() for" 1517 " TCM_Loop failed!\n"); 1518 target_fabric_configfs_free(fabric); 1519 return -1; 1520 } 1521 /* 1522 * Setup our local pointer to *fabric. 1523 */ 1524 tcm_loop_fabric_configfs = fabric; 1525 pr_debug("TCM_LOOP[0] - Set fabric ->" 1526 " tcm_loop_fabric_configfs\n"); 1527 return 0; 1528 } 1529 1530 static void tcm_loop_deregister_configfs(void) 1531 { 1532 if (!tcm_loop_fabric_configfs) 1533 return; 1534 1535 target_fabric_configfs_deregister(tcm_loop_fabric_configfs); 1536 tcm_loop_fabric_configfs = NULL; 1537 pr_debug("TCM_LOOP[0] - Cleared" 1538 " tcm_loop_fabric_configfs\n"); 1539 } 1540 1541 static int __init tcm_loop_fabric_init(void) 1542 { 1543 int ret = -ENOMEM; 1544 1545 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0); 1546 if (!tcm_loop_workqueue) 1547 goto out; 1548 1549 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", 1550 sizeof(struct tcm_loop_cmd), 1551 __alignof__(struct tcm_loop_cmd), 1552 0, NULL); 1553 if (!tcm_loop_cmd_cache) { 1554 pr_debug("kmem_cache_create() for" 1555 " tcm_loop_cmd_cache failed\n"); 1556 goto out_destroy_workqueue; 1557 } 1558 1559 ret = tcm_loop_alloc_core_bus(); 1560 if (ret) 1561 goto out_destroy_cache; 1562 1563 ret = tcm_loop_register_configfs(); 1564 if (ret) 1565 goto out_release_core_bus; 1566 1567 return 0; 1568 1569 out_release_core_bus: 1570 tcm_loop_release_core_bus(); 1571 out_destroy_cache: 1572 kmem_cache_destroy(tcm_loop_cmd_cache); 1573 out_destroy_workqueue: 1574 destroy_workqueue(tcm_loop_workqueue); 1575 out: 1576 return ret; 1577 } 1578 1579 static void __exit tcm_loop_fabric_exit(void) 1580 { 1581 tcm_loop_deregister_configfs(); 1582 tcm_loop_release_core_bus(); 1583 kmem_cache_destroy(tcm_loop_cmd_cache); 1584 destroy_workqueue(tcm_loop_workqueue); 1585 } 1586 1587 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); 1588 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>"); 1589 MODULE_LICENSE("GPL"); 1590 module_init(tcm_loop_fabric_init); 1591 module_exit(tcm_loop_fabric_exit); 1592