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, transfer_length; 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 } 215 216 transfer_length = scsi_transfer_length(sc); 217 if (!scsi_prot_sg_count(sc) && 218 scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) { 219 se_cmd->prot_pto = true; 220 /* 221 * loopback transport doesn't support 222 * WRITE_GENERATE, READ_STRIP protection 223 * information operations, go ahead unprotected. 224 */ 225 transfer_length = scsi_bufflen(sc); 226 } 227 228 rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd, 229 &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun, 230 transfer_length, tcm_loop_sam_attr(sc), 231 sc->sc_data_direction, 0, 232 scsi_sglist(sc), scsi_sg_count(sc), 233 sgl_bidi, sgl_bidi_count, 234 scsi_prot_sglist(sc), scsi_prot_sg_count(sc)); 235 if (rc < 0) { 236 set_host_byte(sc, DID_NO_CONNECT); 237 goto out_done; 238 } 239 return; 240 241 out_done: 242 sc->scsi_done(sc); 243 return; 244 } 245 246 /* 247 * ->queuecommand can be and usually is called from interrupt context, so 248 * defer the actual submission to a workqueue. 249 */ 250 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc) 251 { 252 struct tcm_loop_cmd *tl_cmd; 253 254 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x" 255 " scsi_buf_len: %u\n", sc->device->host->host_no, 256 sc->device->id, sc->device->channel, sc->device->lun, 257 sc->cmnd[0], scsi_bufflen(sc)); 258 259 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC); 260 if (!tl_cmd) { 261 pr_err("Unable to allocate struct tcm_loop_cmd\n"); 262 set_host_byte(sc, DID_ERROR); 263 sc->scsi_done(sc); 264 return 0; 265 } 266 267 tl_cmd->sc = sc; 268 tl_cmd->sc_cmd_tag = sc->tag; 269 INIT_WORK(&tl_cmd->work, tcm_loop_submission_work); 270 queue_work(tcm_loop_workqueue, &tl_cmd->work); 271 return 0; 272 } 273 274 /* 275 * Called from SCSI EH process context to issue a LUN_RESET TMR 276 * to struct scsi_device 277 */ 278 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg, 279 struct tcm_loop_nexus *tl_nexus, 280 int lun, int task, enum tcm_tmreq_table tmr) 281 { 282 struct se_cmd *se_cmd = NULL; 283 struct se_session *se_sess; 284 struct se_portal_group *se_tpg; 285 struct tcm_loop_cmd *tl_cmd = NULL; 286 struct tcm_loop_tmr *tl_tmr = NULL; 287 int ret = TMR_FUNCTION_FAILED, rc; 288 289 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); 290 if (!tl_cmd) { 291 pr_err("Unable to allocate memory for tl_cmd\n"); 292 return ret; 293 } 294 295 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL); 296 if (!tl_tmr) { 297 pr_err("Unable to allocate memory for tl_tmr\n"); 298 goto release; 299 } 300 init_waitqueue_head(&tl_tmr->tl_tmr_wait); 301 302 se_cmd = &tl_cmd->tl_se_cmd; 303 se_tpg = &tl_tpg->tl_se_tpg; 304 se_sess = tl_nexus->se_sess; 305 /* 306 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 307 */ 308 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0, 309 DMA_NONE, MSG_SIMPLE_TAG, 310 &tl_cmd->tl_sense_buf[0]); 311 312 rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL); 313 if (rc < 0) 314 goto release; 315 316 if (tmr == TMR_ABORT_TASK) 317 se_cmd->se_tmr_req->ref_task_tag = task; 318 319 /* 320 * Locate the underlying TCM struct se_lun 321 */ 322 if (transport_lookup_tmr_lun(se_cmd, lun) < 0) { 323 ret = TMR_LUN_DOES_NOT_EXIST; 324 goto release; 325 } 326 /* 327 * Queue the TMR to TCM Core and sleep waiting for 328 * tcm_loop_queue_tm_rsp() to wake us up. 329 */ 330 transport_generic_handle_tmr(se_cmd); 331 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete)); 332 /* 333 * The TMR LUN_RESET has completed, check the response status and 334 * then release allocations. 335 */ 336 ret = se_cmd->se_tmr_req->response; 337 release: 338 if (se_cmd) 339 transport_generic_free_cmd(se_cmd, 1); 340 else 341 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); 342 kfree(tl_tmr); 343 return ret; 344 } 345 346 static int tcm_loop_abort_task(struct scsi_cmnd *sc) 347 { 348 struct tcm_loop_hba *tl_hba; 349 struct tcm_loop_nexus *tl_nexus; 350 struct tcm_loop_tpg *tl_tpg; 351 int ret = FAILED; 352 353 /* 354 * Locate the tcm_loop_hba_t pointer 355 */ 356 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 357 /* 358 * Locate the tl_nexus and se_sess pointers 359 */ 360 tl_nexus = tl_hba->tl_nexus; 361 if (!tl_nexus) { 362 pr_err("Unable to perform device reset without" 363 " active I_T Nexus\n"); 364 return FAILED; 365 } 366 367 /* 368 * Locate the tl_tpg pointer from TargetID in sc->device->id 369 */ 370 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 371 ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun, 372 sc->tag, TMR_ABORT_TASK); 373 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; 374 } 375 376 /* 377 * Called from SCSI EH process context to issue a LUN_RESET TMR 378 * to struct scsi_device 379 */ 380 static int tcm_loop_device_reset(struct scsi_cmnd *sc) 381 { 382 struct tcm_loop_hba *tl_hba; 383 struct tcm_loop_nexus *tl_nexus; 384 struct tcm_loop_tpg *tl_tpg; 385 int ret = FAILED; 386 387 /* 388 * Locate the tcm_loop_hba_t pointer 389 */ 390 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 391 /* 392 * Locate the tl_nexus and se_sess pointers 393 */ 394 tl_nexus = tl_hba->tl_nexus; 395 if (!tl_nexus) { 396 pr_err("Unable to perform device reset without" 397 " active I_T Nexus\n"); 398 return FAILED; 399 } 400 /* 401 * Locate the tl_tpg pointer from TargetID in sc->device->id 402 */ 403 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 404 ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun, 405 0, TMR_LUN_RESET); 406 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; 407 } 408 409 static int tcm_loop_target_reset(struct scsi_cmnd *sc) 410 { 411 struct tcm_loop_hba *tl_hba; 412 struct tcm_loop_tpg *tl_tpg; 413 414 /* 415 * Locate the tcm_loop_hba_t pointer 416 */ 417 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 418 if (!tl_hba) { 419 pr_err("Unable to perform device reset without" 420 " active I_T Nexus\n"); 421 return FAILED; 422 } 423 /* 424 * Locate the tl_tpg pointer from TargetID in sc->device->id 425 */ 426 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 427 if (tl_tpg) { 428 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; 429 return SUCCESS; 430 } 431 return FAILED; 432 } 433 434 static int tcm_loop_slave_alloc(struct scsi_device *sd) 435 { 436 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags); 437 return 0; 438 } 439 440 static int tcm_loop_slave_configure(struct scsi_device *sd) 441 { 442 if (sd->tagged_supported) { 443 scsi_activate_tcq(sd, sd->queue_depth); 444 scsi_adjust_queue_depth(sd, MSG_SIMPLE_TAG, 445 sd->host->cmd_per_lun); 446 } else { 447 scsi_adjust_queue_depth(sd, 0, 448 sd->host->cmd_per_lun); 449 } 450 451 return 0; 452 } 453 454 static struct scsi_host_template tcm_loop_driver_template = { 455 .show_info = tcm_loop_show_info, 456 .proc_name = "tcm_loopback", 457 .name = "TCM_Loopback", 458 .queuecommand = tcm_loop_queuecommand, 459 .change_queue_depth = tcm_loop_change_queue_depth, 460 .change_queue_type = tcm_loop_change_queue_type, 461 .eh_abort_handler = tcm_loop_abort_task, 462 .eh_device_reset_handler = tcm_loop_device_reset, 463 .eh_target_reset_handler = tcm_loop_target_reset, 464 .can_queue = 1024, 465 .this_id = -1, 466 .sg_tablesize = 256, 467 .cmd_per_lun = 1024, 468 .max_sectors = 0xFFFF, 469 .use_clustering = DISABLE_CLUSTERING, 470 .slave_alloc = tcm_loop_slave_alloc, 471 .slave_configure = tcm_loop_slave_configure, 472 .module = THIS_MODULE, 473 }; 474 475 static int tcm_loop_driver_probe(struct device *dev) 476 { 477 struct tcm_loop_hba *tl_hba; 478 struct Scsi_Host *sh; 479 int error, host_prot; 480 481 tl_hba = to_tcm_loop_hba(dev); 482 483 sh = scsi_host_alloc(&tcm_loop_driver_template, 484 sizeof(struct tcm_loop_hba)); 485 if (!sh) { 486 pr_err("Unable to allocate struct scsi_host\n"); 487 return -ENODEV; 488 } 489 tl_hba->sh = sh; 490 491 /* 492 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata 493 */ 494 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba; 495 /* 496 * Setup single ID, Channel and LUN for now.. 497 */ 498 sh->max_id = 2; 499 sh->max_lun = 0; 500 sh->max_channel = 0; 501 sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN; 502 503 host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | 504 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | 505 SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; 506 507 scsi_host_set_prot(sh, host_prot); 508 scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC); 509 510 error = scsi_add_host(sh, &tl_hba->dev); 511 if (error) { 512 pr_err("%s: scsi_add_host failed\n", __func__); 513 scsi_host_put(sh); 514 return -ENODEV; 515 } 516 return 0; 517 } 518 519 static int tcm_loop_driver_remove(struct device *dev) 520 { 521 struct tcm_loop_hba *tl_hba; 522 struct Scsi_Host *sh; 523 524 tl_hba = to_tcm_loop_hba(dev); 525 sh = tl_hba->sh; 526 527 scsi_remove_host(sh); 528 scsi_host_put(sh); 529 return 0; 530 } 531 532 static void tcm_loop_release_adapter(struct device *dev) 533 { 534 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev); 535 536 kfree(tl_hba); 537 } 538 539 /* 540 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c 541 */ 542 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id) 543 { 544 int ret; 545 546 tl_hba->dev.bus = &tcm_loop_lld_bus; 547 tl_hba->dev.parent = tcm_loop_primary; 548 tl_hba->dev.release = &tcm_loop_release_adapter; 549 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id); 550 551 ret = device_register(&tl_hba->dev); 552 if (ret) { 553 pr_err("device_register() failed for" 554 " tl_hba->dev: %d\n", ret); 555 return -ENODEV; 556 } 557 558 return 0; 559 } 560 561 /* 562 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated 563 * tcm_loop SCSI bus. 564 */ 565 static int tcm_loop_alloc_core_bus(void) 566 { 567 int ret; 568 569 tcm_loop_primary = root_device_register("tcm_loop_0"); 570 if (IS_ERR(tcm_loop_primary)) { 571 pr_err("Unable to allocate tcm_loop_primary\n"); 572 return PTR_ERR(tcm_loop_primary); 573 } 574 575 ret = bus_register(&tcm_loop_lld_bus); 576 if (ret) { 577 pr_err("bus_register() failed for tcm_loop_lld_bus\n"); 578 goto dev_unreg; 579 } 580 581 ret = driver_register(&tcm_loop_driverfs); 582 if (ret) { 583 pr_err("driver_register() failed for" 584 "tcm_loop_driverfs\n"); 585 goto bus_unreg; 586 } 587 588 pr_debug("Initialized TCM Loop Core Bus\n"); 589 return ret; 590 591 bus_unreg: 592 bus_unregister(&tcm_loop_lld_bus); 593 dev_unreg: 594 root_device_unregister(tcm_loop_primary); 595 return ret; 596 } 597 598 static void tcm_loop_release_core_bus(void) 599 { 600 driver_unregister(&tcm_loop_driverfs); 601 bus_unregister(&tcm_loop_lld_bus); 602 root_device_unregister(tcm_loop_primary); 603 604 pr_debug("Releasing TCM Loop Core BUS\n"); 605 } 606 607 static char *tcm_loop_get_fabric_name(void) 608 { 609 return "loopback"; 610 } 611 612 static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg) 613 { 614 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 615 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 616 /* 617 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba() 618 * time based on the protocol dependent prefix of the passed configfs group. 619 * 620 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric 621 * ProtocolID using target_core_fabric_lib.c symbols. 622 */ 623 switch (tl_hba->tl_proto_id) { 624 case SCSI_PROTOCOL_SAS: 625 return sas_get_fabric_proto_ident(se_tpg); 626 case SCSI_PROTOCOL_FCP: 627 return fc_get_fabric_proto_ident(se_tpg); 628 case SCSI_PROTOCOL_ISCSI: 629 return iscsi_get_fabric_proto_ident(se_tpg); 630 default: 631 pr_err("Unknown tl_proto_id: 0x%02x, using" 632 " SAS emulation\n", tl_hba->tl_proto_id); 633 break; 634 } 635 636 return sas_get_fabric_proto_ident(se_tpg); 637 } 638 639 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg) 640 { 641 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 642 /* 643 * Return the passed NAA identifier for the SAS Target Port 644 */ 645 return &tl_tpg->tl_hba->tl_wwn_address[0]; 646 } 647 648 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg) 649 { 650 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 651 /* 652 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 653 * to represent the SCSI Target Port. 654 */ 655 return tl_tpg->tl_tpgt; 656 } 657 658 static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg) 659 { 660 return 1; 661 } 662 663 static u32 tcm_loop_get_pr_transport_id( 664 struct se_portal_group *se_tpg, 665 struct se_node_acl *se_nacl, 666 struct t10_pr_registration *pr_reg, 667 int *format_code, 668 unsigned char *buf) 669 { 670 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 671 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 672 673 switch (tl_hba->tl_proto_id) { 674 case SCSI_PROTOCOL_SAS: 675 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 676 format_code, buf); 677 case SCSI_PROTOCOL_FCP: 678 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 679 format_code, buf); 680 case SCSI_PROTOCOL_ISCSI: 681 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 682 format_code, buf); 683 default: 684 pr_err("Unknown tl_proto_id: 0x%02x, using" 685 " SAS emulation\n", tl_hba->tl_proto_id); 686 break; 687 } 688 689 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 690 format_code, buf); 691 } 692 693 static u32 tcm_loop_get_pr_transport_id_len( 694 struct se_portal_group *se_tpg, 695 struct se_node_acl *se_nacl, 696 struct t10_pr_registration *pr_reg, 697 int *format_code) 698 { 699 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 700 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 701 702 switch (tl_hba->tl_proto_id) { 703 case SCSI_PROTOCOL_SAS: 704 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 705 format_code); 706 case SCSI_PROTOCOL_FCP: 707 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 708 format_code); 709 case SCSI_PROTOCOL_ISCSI: 710 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 711 format_code); 712 default: 713 pr_err("Unknown tl_proto_id: 0x%02x, using" 714 " SAS emulation\n", tl_hba->tl_proto_id); 715 break; 716 } 717 718 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 719 format_code); 720 } 721 722 /* 723 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above 724 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. 725 */ 726 static char *tcm_loop_parse_pr_out_transport_id( 727 struct se_portal_group *se_tpg, 728 const char *buf, 729 u32 *out_tid_len, 730 char **port_nexus_ptr) 731 { 732 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 733 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 734 735 switch (tl_hba->tl_proto_id) { 736 case SCSI_PROTOCOL_SAS: 737 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 738 port_nexus_ptr); 739 case SCSI_PROTOCOL_FCP: 740 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 741 port_nexus_ptr); 742 case SCSI_PROTOCOL_ISCSI: 743 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 744 port_nexus_ptr); 745 default: 746 pr_err("Unknown tl_proto_id: 0x%02x, using" 747 " SAS emulation\n", tl_hba->tl_proto_id); 748 break; 749 } 750 751 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 752 port_nexus_ptr); 753 } 754 755 /* 756 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated 757 * based upon the incoming fabric dependent SCSI Initiator Port 758 */ 759 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) 760 { 761 return 1; 762 } 763 764 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) 765 { 766 return 0; 767 } 768 769 /* 770 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for 771 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest 772 */ 773 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) 774 { 775 return 0; 776 } 777 778 /* 779 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will 780 * never be called for TCM_Loop by target_core_fabric_configfs.c code. 781 * It has been added here as a nop for target_fabric_tf_ops_check() 782 */ 783 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) 784 { 785 return 0; 786 } 787 788 static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl( 789 struct se_portal_group *se_tpg) 790 { 791 struct tcm_loop_nacl *tl_nacl; 792 793 tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL); 794 if (!tl_nacl) { 795 pr_err("Unable to allocate struct tcm_loop_nacl\n"); 796 return NULL; 797 } 798 799 return &tl_nacl->se_node_acl; 800 } 801 802 static void tcm_loop_tpg_release_fabric_acl( 803 struct se_portal_group *se_tpg, 804 struct se_node_acl *se_nacl) 805 { 806 struct tcm_loop_nacl *tl_nacl = container_of(se_nacl, 807 struct tcm_loop_nacl, se_node_acl); 808 809 kfree(tl_nacl); 810 } 811 812 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) 813 { 814 return 1; 815 } 816 817 static u32 tcm_loop_sess_get_index(struct se_session *se_sess) 818 { 819 return 1; 820 } 821 822 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) 823 { 824 return; 825 } 826 827 static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd) 828 { 829 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 830 struct tcm_loop_cmd, tl_se_cmd); 831 832 return tl_cmd->sc_cmd_tag; 833 } 834 835 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) 836 { 837 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 838 struct tcm_loop_cmd, tl_se_cmd); 839 840 return tl_cmd->sc_cmd_state; 841 } 842 843 static int tcm_loop_shutdown_session(struct se_session *se_sess) 844 { 845 return 0; 846 } 847 848 static void tcm_loop_close_session(struct se_session *se_sess) 849 { 850 return; 851 }; 852 853 static int tcm_loop_write_pending(struct se_cmd *se_cmd) 854 { 855 /* 856 * Since Linux/SCSI has already sent down a struct scsi_cmnd 857 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array 858 * memory, and memory has already been mapped to struct se_cmd->t_mem_list 859 * format with transport_generic_map_mem_to_cmd(). 860 * 861 * We now tell TCM to add this WRITE CDB directly into the TCM storage 862 * object execution queue. 863 */ 864 target_execute_cmd(se_cmd); 865 return 0; 866 } 867 868 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) 869 { 870 return 0; 871 } 872 873 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) 874 { 875 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 876 struct tcm_loop_cmd, tl_se_cmd); 877 struct scsi_cmnd *sc = tl_cmd->sc; 878 879 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" 880 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 881 882 sc->result = SAM_STAT_GOOD; 883 set_host_byte(sc, DID_OK); 884 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 885 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 886 scsi_set_resid(sc, se_cmd->residual_count); 887 sc->scsi_done(sc); 888 return 0; 889 } 890 891 static int tcm_loop_queue_status(struct se_cmd *se_cmd) 892 { 893 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 894 struct tcm_loop_cmd, tl_se_cmd); 895 struct scsi_cmnd *sc = tl_cmd->sc; 896 897 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" 898 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 899 900 if (se_cmd->sense_buffer && 901 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 902 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 903 904 memcpy(sc->sense_buffer, se_cmd->sense_buffer, 905 SCSI_SENSE_BUFFERSIZE); 906 sc->result = SAM_STAT_CHECK_CONDITION; 907 set_driver_byte(sc, DRIVER_SENSE); 908 } else 909 sc->result = se_cmd->scsi_status; 910 911 set_host_byte(sc, DID_OK); 912 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 913 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 914 scsi_set_resid(sc, se_cmd->residual_count); 915 sc->scsi_done(sc); 916 return 0; 917 } 918 919 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) 920 { 921 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; 922 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; 923 /* 924 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead 925 * and wake up the wait_queue_head_t in tcm_loop_device_reset() 926 */ 927 atomic_set(&tl_tmr->tmr_complete, 1); 928 wake_up(&tl_tmr->tl_tmr_wait); 929 } 930 931 static void tcm_loop_aborted_task(struct se_cmd *se_cmd) 932 { 933 return; 934 } 935 936 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) 937 { 938 switch (tl_hba->tl_proto_id) { 939 case SCSI_PROTOCOL_SAS: 940 return "SAS"; 941 case SCSI_PROTOCOL_FCP: 942 return "FCP"; 943 case SCSI_PROTOCOL_ISCSI: 944 return "iSCSI"; 945 default: 946 break; 947 } 948 949 return "Unknown"; 950 } 951 952 /* Start items for tcm_loop_port_cit */ 953 954 static int tcm_loop_port_link( 955 struct se_portal_group *se_tpg, 956 struct se_lun *lun) 957 { 958 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 959 struct tcm_loop_tpg, tl_se_tpg); 960 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 961 962 atomic_inc(&tl_tpg->tl_tpg_port_count); 963 smp_mb__after_atomic(); 964 /* 965 * Add Linux/SCSI struct scsi_device by HCTL 966 */ 967 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); 968 969 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); 970 return 0; 971 } 972 973 static void tcm_loop_port_unlink( 974 struct se_portal_group *se_tpg, 975 struct se_lun *se_lun) 976 { 977 struct scsi_device *sd; 978 struct tcm_loop_hba *tl_hba; 979 struct tcm_loop_tpg *tl_tpg; 980 981 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); 982 tl_hba = tl_tpg->tl_hba; 983 984 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, 985 se_lun->unpacked_lun); 986 if (!sd) { 987 pr_err("Unable to locate struct scsi_device for %d:%d:" 988 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); 989 return; 990 } 991 /* 992 * Remove Linux/SCSI struct scsi_device by HCTL 993 */ 994 scsi_remove_device(sd); 995 scsi_device_put(sd); 996 997 atomic_dec(&tl_tpg->tl_tpg_port_count); 998 smp_mb__after_atomic(); 999 1000 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); 1001 } 1002 1003 /* End items for tcm_loop_port_cit */ 1004 1005 /* Start items for tcm_loop_nexus_cit */ 1006 1007 static int tcm_loop_make_nexus( 1008 struct tcm_loop_tpg *tl_tpg, 1009 const char *name) 1010 { 1011 struct se_portal_group *se_tpg; 1012 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 1013 struct tcm_loop_nexus *tl_nexus; 1014 int ret = -ENOMEM; 1015 1016 if (tl_tpg->tl_hba->tl_nexus) { 1017 pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n"); 1018 return -EEXIST; 1019 } 1020 se_tpg = &tl_tpg->tl_se_tpg; 1021 1022 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); 1023 if (!tl_nexus) { 1024 pr_err("Unable to allocate struct tcm_loop_nexus\n"); 1025 return -ENOMEM; 1026 } 1027 /* 1028 * Initialize the struct se_session pointer 1029 */ 1030 tl_nexus->se_sess = transport_init_session(TARGET_PROT_ALL); 1031 if (IS_ERR(tl_nexus->se_sess)) { 1032 ret = PTR_ERR(tl_nexus->se_sess); 1033 goto out; 1034 } 1035 /* 1036 * Since we are running in 'demo mode' this call with generate a 1037 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI 1038 * Initiator port name of the passed configfs group 'name'. 1039 */ 1040 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1041 se_tpg, (unsigned char *)name); 1042 if (!tl_nexus->se_sess->se_node_acl) { 1043 transport_free_session(tl_nexus->se_sess); 1044 goto out; 1045 } 1046 /* 1047 * Now, register the SAS I_T Nexus as active with the call to 1048 * transport_register_session() 1049 */ 1050 __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, 1051 tl_nexus->se_sess, tl_nexus); 1052 tl_tpg->tl_hba->tl_nexus = tl_nexus; 1053 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" 1054 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), 1055 name); 1056 return 0; 1057 1058 out: 1059 kfree(tl_nexus); 1060 return ret; 1061 } 1062 1063 static int tcm_loop_drop_nexus( 1064 struct tcm_loop_tpg *tpg) 1065 { 1066 struct se_session *se_sess; 1067 struct tcm_loop_nexus *tl_nexus; 1068 struct tcm_loop_hba *tl_hba = tpg->tl_hba; 1069 1070 if (!tl_hba) 1071 return -ENODEV; 1072 1073 tl_nexus = tl_hba->tl_nexus; 1074 if (!tl_nexus) 1075 return -ENODEV; 1076 1077 se_sess = tl_nexus->se_sess; 1078 if (!se_sess) 1079 return -ENODEV; 1080 1081 if (atomic_read(&tpg->tl_tpg_port_count)) { 1082 pr_err("Unable to remove TCM_Loop I_T Nexus with" 1083 " active TPG port count: %d\n", 1084 atomic_read(&tpg->tl_tpg_port_count)); 1085 return -EPERM; 1086 } 1087 1088 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" 1089 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), 1090 tl_nexus->se_sess->se_node_acl->initiatorname); 1091 /* 1092 * Release the SCSI I_T Nexus to the emulated SAS Target Port 1093 */ 1094 transport_deregister_session(tl_nexus->se_sess); 1095 tpg->tl_hba->tl_nexus = NULL; 1096 kfree(tl_nexus); 1097 return 0; 1098 } 1099 1100 /* End items for tcm_loop_nexus_cit */ 1101 1102 static ssize_t tcm_loop_tpg_show_nexus( 1103 struct se_portal_group *se_tpg, 1104 char *page) 1105 { 1106 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1107 struct tcm_loop_tpg, tl_se_tpg); 1108 struct tcm_loop_nexus *tl_nexus; 1109 ssize_t ret; 1110 1111 tl_nexus = tl_tpg->tl_hba->tl_nexus; 1112 if (!tl_nexus) 1113 return -ENODEV; 1114 1115 ret = snprintf(page, PAGE_SIZE, "%s\n", 1116 tl_nexus->se_sess->se_node_acl->initiatorname); 1117 1118 return ret; 1119 } 1120 1121 static ssize_t tcm_loop_tpg_store_nexus( 1122 struct se_portal_group *se_tpg, 1123 const char *page, 1124 size_t count) 1125 { 1126 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1127 struct tcm_loop_tpg, tl_se_tpg); 1128 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 1129 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; 1130 int ret; 1131 /* 1132 * Shutdown the active I_T nexus if 'NULL' is passed.. 1133 */ 1134 if (!strncmp(page, "NULL", 4)) { 1135 ret = tcm_loop_drop_nexus(tl_tpg); 1136 return (!ret) ? count : ret; 1137 } 1138 /* 1139 * Otherwise make sure the passed virtual Initiator port WWN matches 1140 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call 1141 * tcm_loop_make_nexus() 1142 */ 1143 if (strlen(page) >= TL_WWN_ADDR_LEN) { 1144 pr_err("Emulated NAA Sas Address: %s, exceeds" 1145 " max: %d\n", page, TL_WWN_ADDR_LEN); 1146 return -EINVAL; 1147 } 1148 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); 1149 1150 ptr = strstr(i_port, "naa."); 1151 if (ptr) { 1152 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { 1153 pr_err("Passed SAS Initiator Port %s does not" 1154 " match target port protoid: %s\n", i_port, 1155 tcm_loop_dump_proto_id(tl_hba)); 1156 return -EINVAL; 1157 } 1158 port_ptr = &i_port[0]; 1159 goto check_newline; 1160 } 1161 ptr = strstr(i_port, "fc."); 1162 if (ptr) { 1163 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { 1164 pr_err("Passed FCP Initiator Port %s does not" 1165 " match target port protoid: %s\n", i_port, 1166 tcm_loop_dump_proto_id(tl_hba)); 1167 return -EINVAL; 1168 } 1169 port_ptr = &i_port[3]; /* Skip over "fc." */ 1170 goto check_newline; 1171 } 1172 ptr = strstr(i_port, "iqn."); 1173 if (ptr) { 1174 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { 1175 pr_err("Passed iSCSI Initiator Port %s does not" 1176 " match target port protoid: %s\n", i_port, 1177 tcm_loop_dump_proto_id(tl_hba)); 1178 return -EINVAL; 1179 } 1180 port_ptr = &i_port[0]; 1181 goto check_newline; 1182 } 1183 pr_err("Unable to locate prefix for emulated Initiator Port:" 1184 " %s\n", i_port); 1185 return -EINVAL; 1186 /* 1187 * Clear any trailing newline for the NAA WWN 1188 */ 1189 check_newline: 1190 if (i_port[strlen(i_port)-1] == '\n') 1191 i_port[strlen(i_port)-1] = '\0'; 1192 1193 ret = tcm_loop_make_nexus(tl_tpg, port_ptr); 1194 if (ret < 0) 1195 return ret; 1196 1197 return count; 1198 } 1199 1200 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); 1201 1202 static ssize_t tcm_loop_tpg_show_transport_status( 1203 struct se_portal_group *se_tpg, 1204 char *page) 1205 { 1206 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1207 struct tcm_loop_tpg, tl_se_tpg); 1208 const char *status = NULL; 1209 ssize_t ret = -EINVAL; 1210 1211 switch (tl_tpg->tl_transport_status) { 1212 case TCM_TRANSPORT_ONLINE: 1213 status = "online"; 1214 break; 1215 case TCM_TRANSPORT_OFFLINE: 1216 status = "offline"; 1217 break; 1218 default: 1219 break; 1220 } 1221 1222 if (status) 1223 ret = snprintf(page, PAGE_SIZE, "%s\n", status); 1224 1225 return ret; 1226 } 1227 1228 static ssize_t tcm_loop_tpg_store_transport_status( 1229 struct se_portal_group *se_tpg, 1230 const char *page, 1231 size_t count) 1232 { 1233 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1234 struct tcm_loop_tpg, tl_se_tpg); 1235 1236 if (!strncmp(page, "online", 6)) { 1237 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; 1238 return count; 1239 } 1240 if (!strncmp(page, "offline", 7)) { 1241 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE; 1242 return count; 1243 } 1244 return -EINVAL; 1245 } 1246 1247 TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR); 1248 1249 static struct configfs_attribute *tcm_loop_tpg_attrs[] = { 1250 &tcm_loop_tpg_nexus.attr, 1251 &tcm_loop_tpg_transport_status.attr, 1252 NULL, 1253 }; 1254 1255 /* Start items for tcm_loop_naa_cit */ 1256 1257 static struct se_portal_group *tcm_loop_make_naa_tpg( 1258 struct se_wwn *wwn, 1259 struct config_group *group, 1260 const char *name) 1261 { 1262 struct tcm_loop_hba *tl_hba = container_of(wwn, 1263 struct tcm_loop_hba, tl_hba_wwn); 1264 struct tcm_loop_tpg *tl_tpg; 1265 char *tpgt_str, *end_ptr; 1266 int ret; 1267 unsigned short int tpgt; 1268 1269 tpgt_str = strstr(name, "tpgt_"); 1270 if (!tpgt_str) { 1271 pr_err("Unable to locate \"tpgt_#\" directory" 1272 " group\n"); 1273 return ERR_PTR(-EINVAL); 1274 } 1275 tpgt_str += 5; /* Skip ahead of "tpgt_" */ 1276 tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0); 1277 1278 if (tpgt >= TL_TPGS_PER_HBA) { 1279 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:" 1280 " %u\n", tpgt, TL_TPGS_PER_HBA); 1281 return ERR_PTR(-EINVAL); 1282 } 1283 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; 1284 tl_tpg->tl_hba = tl_hba; 1285 tl_tpg->tl_tpgt = tpgt; 1286 /* 1287 * Register the tl_tpg as a emulated SAS TCM Target Endpoint 1288 */ 1289 ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops, 1290 wwn, &tl_tpg->tl_se_tpg, tl_tpg, 1291 TRANSPORT_TPG_TYPE_NORMAL); 1292 if (ret < 0) 1293 return ERR_PTR(-ENOMEM); 1294 1295 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" 1296 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), 1297 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1298 1299 return &tl_tpg->tl_se_tpg; 1300 } 1301 1302 static void tcm_loop_drop_naa_tpg( 1303 struct se_portal_group *se_tpg) 1304 { 1305 struct se_wwn *wwn = se_tpg->se_tpg_wwn; 1306 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1307 struct tcm_loop_tpg, tl_se_tpg); 1308 struct tcm_loop_hba *tl_hba; 1309 unsigned short tpgt; 1310 1311 tl_hba = tl_tpg->tl_hba; 1312 tpgt = tl_tpg->tl_tpgt; 1313 /* 1314 * Release the I_T Nexus for the Virtual SAS link if present 1315 */ 1316 tcm_loop_drop_nexus(tl_tpg); 1317 /* 1318 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint 1319 */ 1320 core_tpg_deregister(se_tpg); 1321 1322 tl_tpg->tl_hba = NULL; 1323 tl_tpg->tl_tpgt = 0; 1324 1325 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" 1326 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), 1327 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1328 } 1329 1330 /* End items for tcm_loop_naa_cit */ 1331 1332 /* Start items for tcm_loop_cit */ 1333 1334 static struct se_wwn *tcm_loop_make_scsi_hba( 1335 struct target_fabric_configfs *tf, 1336 struct config_group *group, 1337 const char *name) 1338 { 1339 struct tcm_loop_hba *tl_hba; 1340 struct Scsi_Host *sh; 1341 char *ptr; 1342 int ret, off = 0; 1343 1344 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); 1345 if (!tl_hba) { 1346 pr_err("Unable to allocate struct tcm_loop_hba\n"); 1347 return ERR_PTR(-ENOMEM); 1348 } 1349 /* 1350 * Determine the emulated Protocol Identifier and Target Port Name 1351 * based on the incoming configfs directory name. 1352 */ 1353 ptr = strstr(name, "naa."); 1354 if (ptr) { 1355 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; 1356 goto check_len; 1357 } 1358 ptr = strstr(name, "fc."); 1359 if (ptr) { 1360 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; 1361 off = 3; /* Skip over "fc." */ 1362 goto check_len; 1363 } 1364 ptr = strstr(name, "iqn."); 1365 if (!ptr) { 1366 pr_err("Unable to locate prefix for emulated Target " 1367 "Port: %s\n", name); 1368 ret = -EINVAL; 1369 goto out; 1370 } 1371 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; 1372 1373 check_len: 1374 if (strlen(name) >= TL_WWN_ADDR_LEN) { 1375 pr_err("Emulated NAA %s Address: %s, exceeds" 1376 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), 1377 TL_WWN_ADDR_LEN); 1378 ret = -EINVAL; 1379 goto out; 1380 } 1381 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); 1382 1383 /* 1384 * Call device_register(tl_hba->dev) to register the emulated 1385 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after 1386 * device_register() callbacks in tcm_loop_driver_probe() 1387 */ 1388 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); 1389 if (ret) 1390 goto out; 1391 1392 sh = tl_hba->sh; 1393 tcm_loop_hba_no_cnt++; 1394 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" 1395 " %s Address: %s at Linux/SCSI Host ID: %d\n", 1396 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); 1397 1398 return &tl_hba->tl_hba_wwn; 1399 out: 1400 kfree(tl_hba); 1401 return ERR_PTR(ret); 1402 } 1403 1404 static void tcm_loop_drop_scsi_hba( 1405 struct se_wwn *wwn) 1406 { 1407 struct tcm_loop_hba *tl_hba = container_of(wwn, 1408 struct tcm_loop_hba, tl_hba_wwn); 1409 1410 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target" 1411 " SAS Address: %s at Linux/SCSI Host ID: %d\n", 1412 tl_hba->tl_wwn_address, tl_hba->sh->host_no); 1413 /* 1414 * Call device_unregister() on the original tl_hba->dev. 1415 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will 1416 * release *tl_hba; 1417 */ 1418 device_unregister(&tl_hba->dev); 1419 } 1420 1421 /* Start items for tcm_loop_cit */ 1422 static ssize_t tcm_loop_wwn_show_attr_version( 1423 struct target_fabric_configfs *tf, 1424 char *page) 1425 { 1426 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); 1427 } 1428 1429 TF_WWN_ATTR_RO(tcm_loop, version); 1430 1431 static struct configfs_attribute *tcm_loop_wwn_attrs[] = { 1432 &tcm_loop_wwn_version.attr, 1433 NULL, 1434 }; 1435 1436 /* End items for tcm_loop_cit */ 1437 1438 static int tcm_loop_register_configfs(void) 1439 { 1440 struct target_fabric_configfs *fabric; 1441 int ret; 1442 /* 1443 * Set the TCM Loop HBA counter to zero 1444 */ 1445 tcm_loop_hba_no_cnt = 0; 1446 /* 1447 * Register the top level struct config_item_type with TCM core 1448 */ 1449 fabric = target_fabric_configfs_init(THIS_MODULE, "loopback"); 1450 if (IS_ERR(fabric)) { 1451 pr_err("tcm_loop_register_configfs() failed!\n"); 1452 return PTR_ERR(fabric); 1453 } 1454 /* 1455 * Setup the fabric API of function pointers used by target_core_mod 1456 */ 1457 fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name; 1458 fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident; 1459 fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn; 1460 fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag; 1461 fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth; 1462 fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id; 1463 fabric->tf_ops.tpg_get_pr_transport_id_len = 1464 &tcm_loop_get_pr_transport_id_len; 1465 fabric->tf_ops.tpg_parse_pr_out_transport_id = 1466 &tcm_loop_parse_pr_out_transport_id; 1467 fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode; 1468 fabric->tf_ops.tpg_check_demo_mode_cache = 1469 &tcm_loop_check_demo_mode_cache; 1470 fabric->tf_ops.tpg_check_demo_mode_write_protect = 1471 &tcm_loop_check_demo_mode_write_protect; 1472 fabric->tf_ops.tpg_check_prod_mode_write_protect = 1473 &tcm_loop_check_prod_mode_write_protect; 1474 /* 1475 * The TCM loopback fabric module runs in demo-mode to a local 1476 * virtual SCSI device, so fabric dependent initator ACLs are 1477 * not required. 1478 */ 1479 fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl; 1480 fabric->tf_ops.tpg_release_fabric_acl = 1481 &tcm_loop_tpg_release_fabric_acl; 1482 fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index; 1483 /* 1484 * Used for setting up remaining TCM resources in process context 1485 */ 1486 fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free; 1487 fabric->tf_ops.release_cmd = &tcm_loop_release_cmd; 1488 fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session; 1489 fabric->tf_ops.close_session = &tcm_loop_close_session; 1490 fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index; 1491 fabric->tf_ops.sess_get_initiator_sid = NULL; 1492 fabric->tf_ops.write_pending = &tcm_loop_write_pending; 1493 fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status; 1494 /* 1495 * Not used for TCM loopback 1496 */ 1497 fabric->tf_ops.set_default_node_attributes = 1498 &tcm_loop_set_default_node_attributes; 1499 fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag; 1500 fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state; 1501 fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in; 1502 fabric->tf_ops.queue_status = &tcm_loop_queue_status; 1503 fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp; 1504 fabric->tf_ops.aborted_task = &tcm_loop_aborted_task; 1505 1506 /* 1507 * Setup function pointers for generic logic in target_core_fabric_configfs.c 1508 */ 1509 fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba; 1510 fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba; 1511 fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg; 1512 fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg; 1513 /* 1514 * fabric_post_link() and fabric_pre_unlink() are used for 1515 * registration and release of TCM Loop Virtual SCSI LUNs. 1516 */ 1517 fabric->tf_ops.fabric_post_link = &tcm_loop_port_link; 1518 fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink; 1519 fabric->tf_ops.fabric_make_np = NULL; 1520 fabric->tf_ops.fabric_drop_np = NULL; 1521 /* 1522 * Setup default attribute lists for various fabric->tf_cit_tmpl 1523 */ 1524 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs; 1525 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs; 1526 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL; 1527 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL; 1528 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL; 1529 /* 1530 * Once fabric->tf_ops has been setup, now register the fabric for 1531 * use within TCM 1532 */ 1533 ret = target_fabric_configfs_register(fabric); 1534 if (ret < 0) { 1535 pr_err("target_fabric_configfs_register() for" 1536 " TCM_Loop failed!\n"); 1537 target_fabric_configfs_free(fabric); 1538 return -1; 1539 } 1540 /* 1541 * Setup our local pointer to *fabric. 1542 */ 1543 tcm_loop_fabric_configfs = fabric; 1544 pr_debug("TCM_LOOP[0] - Set fabric ->" 1545 " tcm_loop_fabric_configfs\n"); 1546 return 0; 1547 } 1548 1549 static void tcm_loop_deregister_configfs(void) 1550 { 1551 if (!tcm_loop_fabric_configfs) 1552 return; 1553 1554 target_fabric_configfs_deregister(tcm_loop_fabric_configfs); 1555 tcm_loop_fabric_configfs = NULL; 1556 pr_debug("TCM_LOOP[0] - Cleared" 1557 " tcm_loop_fabric_configfs\n"); 1558 } 1559 1560 static int __init tcm_loop_fabric_init(void) 1561 { 1562 int ret = -ENOMEM; 1563 1564 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0); 1565 if (!tcm_loop_workqueue) 1566 goto out; 1567 1568 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", 1569 sizeof(struct tcm_loop_cmd), 1570 __alignof__(struct tcm_loop_cmd), 1571 0, NULL); 1572 if (!tcm_loop_cmd_cache) { 1573 pr_debug("kmem_cache_create() for" 1574 " tcm_loop_cmd_cache failed\n"); 1575 goto out_destroy_workqueue; 1576 } 1577 1578 ret = tcm_loop_alloc_core_bus(); 1579 if (ret) 1580 goto out_destroy_cache; 1581 1582 ret = tcm_loop_register_configfs(); 1583 if (ret) 1584 goto out_release_core_bus; 1585 1586 return 0; 1587 1588 out_release_core_bus: 1589 tcm_loop_release_core_bus(); 1590 out_destroy_cache: 1591 kmem_cache_destroy(tcm_loop_cmd_cache); 1592 out_destroy_workqueue: 1593 destroy_workqueue(tcm_loop_workqueue); 1594 out: 1595 return ret; 1596 } 1597 1598 static void __exit tcm_loop_fabric_exit(void) 1599 { 1600 tcm_loop_deregister_configfs(); 1601 tcm_loop_release_core_bus(); 1602 kmem_cache_destroy(tcm_loop_cmd_cache); 1603 destroy_workqueue(tcm_loop_workqueue); 1604 } 1605 1606 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); 1607 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>"); 1608 MODULE_LICENSE("GPL"); 1609 module_init(tcm_loop_fabric_init); 1610 module_exit(tcm_loop_fabric_exit); 1611