1 /******************************************************************************* 2 * 3 * This file contains the Linux/SCSI LLD virtual SCSI initiator driver 4 * for emulated SAS initiator ports 5 * 6 * © Copyright 2011-2013 Datera, Inc. 7 * 8 * Licensed to the Linux Foundation under the General Public License (GPL) version 2. 9 * 10 * Author: Nicholas A. Bellinger <[email protected]> 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 ****************************************************************************/ 22 23 #include <linux/module.h> 24 #include <linux/moduleparam.h> 25 #include <linux/init.h> 26 #include <linux/slab.h> 27 #include <linux/types.h> 28 #include <linux/configfs.h> 29 #include <scsi/scsi.h> 30 #include <scsi/scsi_tcq.h> 31 #include <scsi/scsi_host.h> 32 #include <scsi/scsi_device.h> 33 #include <scsi/scsi_cmnd.h> 34 35 #include <target/target_core_base.h> 36 #include <target/target_core_fabric.h> 37 #include <target/target_core_fabric_configfs.h> 38 #include <target/target_core_configfs.h> 39 40 #include "tcm_loop.h" 41 42 #define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev) 43 44 static const struct target_core_fabric_ops loop_ops; 45 46 static struct workqueue_struct *tcm_loop_workqueue; 47 static struct kmem_cache *tcm_loop_cmd_cache; 48 49 static int tcm_loop_hba_no_cnt; 50 51 static int tcm_loop_queue_status(struct se_cmd *se_cmd); 52 53 /* 54 * Called from struct target_core_fabric_ops->check_stop_free() 55 */ 56 static int tcm_loop_check_stop_free(struct se_cmd *se_cmd) 57 { 58 /* 59 * Do not release struct se_cmd's containing a valid TMR 60 * pointer. These will be released directly in tcm_loop_device_reset() 61 * with transport_generic_free_cmd(). 62 */ 63 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 64 return 0; 65 /* 66 * Release the struct se_cmd, which will make a callback to release 67 * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd() 68 */ 69 transport_generic_free_cmd(se_cmd, 0); 70 return 1; 71 } 72 73 static void tcm_loop_release_cmd(struct se_cmd *se_cmd) 74 { 75 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 76 struct tcm_loop_cmd, tl_se_cmd); 77 78 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); 79 } 80 81 static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host) 82 { 83 seq_printf(m, "tcm_loop_proc_info()\n"); 84 return 0; 85 } 86 87 static int tcm_loop_driver_probe(struct device *); 88 static int tcm_loop_driver_remove(struct device *); 89 90 static int pseudo_lld_bus_match(struct device *dev, 91 struct device_driver *dev_driver) 92 { 93 return 1; 94 } 95 96 static struct bus_type tcm_loop_lld_bus = { 97 .name = "tcm_loop_bus", 98 .match = pseudo_lld_bus_match, 99 .probe = tcm_loop_driver_probe, 100 .remove = tcm_loop_driver_remove, 101 }; 102 103 static struct device_driver tcm_loop_driverfs = { 104 .name = "tcm_loop", 105 .bus = &tcm_loop_lld_bus, 106 }; 107 /* 108 * Used with root_device_register() in tcm_loop_alloc_core_bus() below 109 */ 110 static struct device *tcm_loop_primary; 111 112 static void tcm_loop_submission_work(struct work_struct *work) 113 { 114 struct tcm_loop_cmd *tl_cmd = 115 container_of(work, struct tcm_loop_cmd, work); 116 struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd; 117 struct scsi_cmnd *sc = tl_cmd->sc; 118 struct tcm_loop_nexus *tl_nexus; 119 struct tcm_loop_hba *tl_hba; 120 struct tcm_loop_tpg *tl_tpg; 121 struct scatterlist *sgl_bidi = NULL; 122 u32 sgl_bidi_count = 0, transfer_length; 123 int rc; 124 125 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 126 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 127 128 /* 129 * Ensure that this tl_tpg reference from the incoming sc->device->id 130 * has already been configured via tcm_loop_make_naa_tpg(). 131 */ 132 if (!tl_tpg->tl_hba) { 133 set_host_byte(sc, DID_NO_CONNECT); 134 goto out_done; 135 } 136 if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) { 137 set_host_byte(sc, DID_TRANSPORT_DISRUPTED); 138 goto out_done; 139 } 140 tl_nexus = tl_tpg->tl_nexus; 141 if (!tl_nexus) { 142 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus" 143 " does not exist\n"); 144 set_host_byte(sc, DID_ERROR); 145 goto out_done; 146 } 147 if (scsi_bidi_cmnd(sc)) { 148 struct scsi_data_buffer *sdb = scsi_in(sc); 149 150 sgl_bidi = sdb->table.sgl; 151 sgl_bidi_count = sdb->table.nents; 152 se_cmd->se_cmd_flags |= SCF_BIDI; 153 154 } 155 156 transfer_length = scsi_transfer_length(sc); 157 if (!scsi_prot_sg_count(sc) && 158 scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) { 159 se_cmd->prot_pto = true; 160 /* 161 * loopback transport doesn't support 162 * WRITE_GENERATE, READ_STRIP protection 163 * information operations, go ahead unprotected. 164 */ 165 transfer_length = scsi_bufflen(sc); 166 } 167 168 rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd, 169 &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun, 170 transfer_length, TCM_SIMPLE_TAG, 171 sc->sc_data_direction, 0, 172 scsi_sglist(sc), scsi_sg_count(sc), 173 sgl_bidi, sgl_bidi_count, 174 scsi_prot_sglist(sc), scsi_prot_sg_count(sc)); 175 if (rc < 0) { 176 set_host_byte(sc, DID_NO_CONNECT); 177 goto out_done; 178 } 179 return; 180 181 out_done: 182 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); 183 sc->scsi_done(sc); 184 return; 185 } 186 187 /* 188 * ->queuecommand can be and usually is called from interrupt context, so 189 * defer the actual submission to a workqueue. 190 */ 191 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc) 192 { 193 struct tcm_loop_cmd *tl_cmd; 194 195 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%llu got CDB: 0x%02x" 196 " scsi_buf_len: %u\n", sc->device->host->host_no, 197 sc->device->id, sc->device->channel, sc->device->lun, 198 sc->cmnd[0], scsi_bufflen(sc)); 199 200 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC); 201 if (!tl_cmd) { 202 pr_err("Unable to allocate struct tcm_loop_cmd\n"); 203 set_host_byte(sc, DID_ERROR); 204 sc->scsi_done(sc); 205 return 0; 206 } 207 208 tl_cmd->sc = sc; 209 tl_cmd->sc_cmd_tag = sc->request->tag; 210 INIT_WORK(&tl_cmd->work, tcm_loop_submission_work); 211 queue_work(tcm_loop_workqueue, &tl_cmd->work); 212 return 0; 213 } 214 215 /* 216 * Called from SCSI EH process context to issue a LUN_RESET TMR 217 * to struct scsi_device 218 */ 219 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg, 220 int lun, int task, enum tcm_tmreq_table tmr) 221 { 222 struct se_cmd *se_cmd = NULL; 223 struct se_session *se_sess; 224 struct se_portal_group *se_tpg; 225 struct tcm_loop_nexus *tl_nexus; 226 struct tcm_loop_cmd *tl_cmd = NULL; 227 struct tcm_loop_tmr *tl_tmr = NULL; 228 int ret = TMR_FUNCTION_FAILED, rc; 229 230 /* 231 * Locate the tl_nexus and se_sess pointers 232 */ 233 tl_nexus = tl_tpg->tl_nexus; 234 if (!tl_nexus) { 235 pr_err("Unable to perform device reset without" 236 " active I_T Nexus\n"); 237 return ret; 238 } 239 240 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); 241 if (!tl_cmd) { 242 pr_err("Unable to allocate memory for tl_cmd\n"); 243 return ret; 244 } 245 246 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL); 247 if (!tl_tmr) { 248 pr_err("Unable to allocate memory for tl_tmr\n"); 249 goto release; 250 } 251 init_waitqueue_head(&tl_tmr->tl_tmr_wait); 252 253 se_cmd = &tl_cmd->tl_se_cmd; 254 se_tpg = &tl_tpg->tl_se_tpg; 255 se_sess = tl_tpg->tl_nexus->se_sess; 256 /* 257 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 258 */ 259 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0, 260 DMA_NONE, TCM_SIMPLE_TAG, 261 &tl_cmd->tl_sense_buf[0]); 262 263 rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL); 264 if (rc < 0) 265 goto release; 266 267 if (tmr == TMR_ABORT_TASK) 268 se_cmd->se_tmr_req->ref_task_tag = task; 269 270 /* 271 * Locate the underlying TCM struct se_lun 272 */ 273 if (transport_lookup_tmr_lun(se_cmd, lun) < 0) { 274 ret = TMR_LUN_DOES_NOT_EXIST; 275 goto release; 276 } 277 /* 278 * Queue the TMR to TCM Core and sleep waiting for 279 * tcm_loop_queue_tm_rsp() to wake us up. 280 */ 281 transport_generic_handle_tmr(se_cmd); 282 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete)); 283 /* 284 * The TMR LUN_RESET has completed, check the response status and 285 * then release allocations. 286 */ 287 ret = se_cmd->se_tmr_req->response; 288 release: 289 if (se_cmd) 290 transport_generic_free_cmd(se_cmd, 1); 291 else 292 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); 293 kfree(tl_tmr); 294 return ret; 295 } 296 297 static int tcm_loop_abort_task(struct scsi_cmnd *sc) 298 { 299 struct tcm_loop_hba *tl_hba; 300 struct tcm_loop_tpg *tl_tpg; 301 int ret = FAILED; 302 303 /* 304 * Locate the tcm_loop_hba_t pointer 305 */ 306 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 307 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 308 ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun, 309 sc->request->tag, TMR_ABORT_TASK); 310 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; 311 } 312 313 /* 314 * Called from SCSI EH process context to issue a LUN_RESET TMR 315 * to struct scsi_device 316 */ 317 static int tcm_loop_device_reset(struct scsi_cmnd *sc) 318 { 319 struct tcm_loop_hba *tl_hba; 320 struct tcm_loop_tpg *tl_tpg; 321 int ret = FAILED; 322 323 /* 324 * Locate the tcm_loop_hba_t pointer 325 */ 326 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 327 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 328 329 ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun, 330 0, TMR_LUN_RESET); 331 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; 332 } 333 334 static int tcm_loop_target_reset(struct scsi_cmnd *sc) 335 { 336 struct tcm_loop_hba *tl_hba; 337 struct tcm_loop_tpg *tl_tpg; 338 339 /* 340 * Locate the tcm_loop_hba_t pointer 341 */ 342 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 343 if (!tl_hba) { 344 pr_err("Unable to perform device reset without" 345 " active I_T Nexus\n"); 346 return FAILED; 347 } 348 /* 349 * Locate the tl_tpg pointer from TargetID in sc->device->id 350 */ 351 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 352 if (tl_tpg) { 353 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; 354 return SUCCESS; 355 } 356 return FAILED; 357 } 358 359 static int tcm_loop_slave_alloc(struct scsi_device *sd) 360 { 361 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags); 362 return 0; 363 } 364 365 static struct scsi_host_template tcm_loop_driver_template = { 366 .show_info = tcm_loop_show_info, 367 .proc_name = "tcm_loopback", 368 .name = "TCM_Loopback", 369 .queuecommand = tcm_loop_queuecommand, 370 .change_queue_depth = scsi_change_queue_depth, 371 .eh_abort_handler = tcm_loop_abort_task, 372 .eh_device_reset_handler = tcm_loop_device_reset, 373 .eh_target_reset_handler = tcm_loop_target_reset, 374 .can_queue = 1024, 375 .this_id = -1, 376 .sg_tablesize = 256, 377 .cmd_per_lun = 1024, 378 .max_sectors = 0xFFFF, 379 .use_clustering = DISABLE_CLUSTERING, 380 .slave_alloc = tcm_loop_slave_alloc, 381 .module = THIS_MODULE, 382 .use_blk_tags = 1, 383 .track_queue_depth = 1, 384 }; 385 386 static int tcm_loop_driver_probe(struct device *dev) 387 { 388 struct tcm_loop_hba *tl_hba; 389 struct Scsi_Host *sh; 390 int error, host_prot; 391 392 tl_hba = to_tcm_loop_hba(dev); 393 394 sh = scsi_host_alloc(&tcm_loop_driver_template, 395 sizeof(struct tcm_loop_hba)); 396 if (!sh) { 397 pr_err("Unable to allocate struct scsi_host\n"); 398 return -ENODEV; 399 } 400 tl_hba->sh = sh; 401 402 /* 403 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata 404 */ 405 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba; 406 /* 407 * Setup single ID, Channel and LUN for now.. 408 */ 409 sh->max_id = 2; 410 sh->max_lun = 0; 411 sh->max_channel = 0; 412 sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; 413 414 host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | 415 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | 416 SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; 417 418 scsi_host_set_prot(sh, host_prot); 419 scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC); 420 421 error = scsi_add_host(sh, &tl_hba->dev); 422 if (error) { 423 pr_err("%s: scsi_add_host failed\n", __func__); 424 scsi_host_put(sh); 425 return -ENODEV; 426 } 427 return 0; 428 } 429 430 static int tcm_loop_driver_remove(struct device *dev) 431 { 432 struct tcm_loop_hba *tl_hba; 433 struct Scsi_Host *sh; 434 435 tl_hba = to_tcm_loop_hba(dev); 436 sh = tl_hba->sh; 437 438 scsi_remove_host(sh); 439 scsi_host_put(sh); 440 return 0; 441 } 442 443 static void tcm_loop_release_adapter(struct device *dev) 444 { 445 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev); 446 447 kfree(tl_hba); 448 } 449 450 /* 451 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c 452 */ 453 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id) 454 { 455 int ret; 456 457 tl_hba->dev.bus = &tcm_loop_lld_bus; 458 tl_hba->dev.parent = tcm_loop_primary; 459 tl_hba->dev.release = &tcm_loop_release_adapter; 460 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id); 461 462 ret = device_register(&tl_hba->dev); 463 if (ret) { 464 pr_err("device_register() failed for" 465 " tl_hba->dev: %d\n", ret); 466 return -ENODEV; 467 } 468 469 return 0; 470 } 471 472 /* 473 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated 474 * tcm_loop SCSI bus. 475 */ 476 static int tcm_loop_alloc_core_bus(void) 477 { 478 int ret; 479 480 tcm_loop_primary = root_device_register("tcm_loop_0"); 481 if (IS_ERR(tcm_loop_primary)) { 482 pr_err("Unable to allocate tcm_loop_primary\n"); 483 return PTR_ERR(tcm_loop_primary); 484 } 485 486 ret = bus_register(&tcm_loop_lld_bus); 487 if (ret) { 488 pr_err("bus_register() failed for tcm_loop_lld_bus\n"); 489 goto dev_unreg; 490 } 491 492 ret = driver_register(&tcm_loop_driverfs); 493 if (ret) { 494 pr_err("driver_register() failed for" 495 "tcm_loop_driverfs\n"); 496 goto bus_unreg; 497 } 498 499 pr_debug("Initialized TCM Loop Core Bus\n"); 500 return ret; 501 502 bus_unreg: 503 bus_unregister(&tcm_loop_lld_bus); 504 dev_unreg: 505 root_device_unregister(tcm_loop_primary); 506 return ret; 507 } 508 509 static void tcm_loop_release_core_bus(void) 510 { 511 driver_unregister(&tcm_loop_driverfs); 512 bus_unregister(&tcm_loop_lld_bus); 513 root_device_unregister(tcm_loop_primary); 514 515 pr_debug("Releasing TCM Loop Core BUS\n"); 516 } 517 518 static char *tcm_loop_get_fabric_name(void) 519 { 520 return "loopback"; 521 } 522 523 static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg) 524 { 525 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 526 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 527 /* 528 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba() 529 * time based on the protocol dependent prefix of the passed configfs group. 530 * 531 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric 532 * ProtocolID using target_core_fabric_lib.c symbols. 533 */ 534 switch (tl_hba->tl_proto_id) { 535 case SCSI_PROTOCOL_SAS: 536 return sas_get_fabric_proto_ident(se_tpg); 537 case SCSI_PROTOCOL_FCP: 538 return fc_get_fabric_proto_ident(se_tpg); 539 case SCSI_PROTOCOL_ISCSI: 540 return iscsi_get_fabric_proto_ident(se_tpg); 541 default: 542 pr_err("Unknown tl_proto_id: 0x%02x, using" 543 " SAS emulation\n", tl_hba->tl_proto_id); 544 break; 545 } 546 547 return sas_get_fabric_proto_ident(se_tpg); 548 } 549 550 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg) 551 { 552 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 553 /* 554 * Return the passed NAA identifier for the SAS Target Port 555 */ 556 return &tl_tpg->tl_hba->tl_wwn_address[0]; 557 } 558 559 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg) 560 { 561 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 562 /* 563 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 564 * to represent the SCSI Target Port. 565 */ 566 return tl_tpg->tl_tpgt; 567 } 568 569 static u32 tcm_loop_get_pr_transport_id( 570 struct se_portal_group *se_tpg, 571 struct se_node_acl *se_nacl, 572 struct t10_pr_registration *pr_reg, 573 int *format_code, 574 unsigned char *buf) 575 { 576 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 577 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 578 579 switch (tl_hba->tl_proto_id) { 580 case SCSI_PROTOCOL_SAS: 581 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 582 format_code, buf); 583 case SCSI_PROTOCOL_FCP: 584 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 585 format_code, buf); 586 case SCSI_PROTOCOL_ISCSI: 587 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 588 format_code, buf); 589 default: 590 pr_err("Unknown tl_proto_id: 0x%02x, using" 591 " SAS emulation\n", tl_hba->tl_proto_id); 592 break; 593 } 594 595 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 596 format_code, buf); 597 } 598 599 static u32 tcm_loop_get_pr_transport_id_len( 600 struct se_portal_group *se_tpg, 601 struct se_node_acl *se_nacl, 602 struct t10_pr_registration *pr_reg, 603 int *format_code) 604 { 605 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 606 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 607 608 switch (tl_hba->tl_proto_id) { 609 case SCSI_PROTOCOL_SAS: 610 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 611 format_code); 612 case SCSI_PROTOCOL_FCP: 613 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 614 format_code); 615 case SCSI_PROTOCOL_ISCSI: 616 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 617 format_code); 618 default: 619 pr_err("Unknown tl_proto_id: 0x%02x, using" 620 " SAS emulation\n", tl_hba->tl_proto_id); 621 break; 622 } 623 624 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 625 format_code); 626 } 627 628 /* 629 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above 630 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. 631 */ 632 static char *tcm_loop_parse_pr_out_transport_id( 633 struct se_portal_group *se_tpg, 634 const char *buf, 635 u32 *out_tid_len, 636 char **port_nexus_ptr) 637 { 638 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 639 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 640 641 switch (tl_hba->tl_proto_id) { 642 case SCSI_PROTOCOL_SAS: 643 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 644 port_nexus_ptr); 645 case SCSI_PROTOCOL_FCP: 646 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 647 port_nexus_ptr); 648 case SCSI_PROTOCOL_ISCSI: 649 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 650 port_nexus_ptr); 651 default: 652 pr_err("Unknown tl_proto_id: 0x%02x, using" 653 " SAS emulation\n", tl_hba->tl_proto_id); 654 break; 655 } 656 657 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 658 port_nexus_ptr); 659 } 660 661 /* 662 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated 663 * based upon the incoming fabric dependent SCSI Initiator Port 664 */ 665 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) 666 { 667 return 1; 668 } 669 670 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) 671 { 672 return 0; 673 } 674 675 /* 676 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for 677 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest 678 */ 679 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) 680 { 681 return 0; 682 } 683 684 /* 685 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will 686 * never be called for TCM_Loop by target_core_fabric_configfs.c code. 687 * It has been added here as a nop for target_fabric_tf_ops_check() 688 */ 689 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) 690 { 691 return 0; 692 } 693 694 static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg) 695 { 696 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 697 tl_se_tpg); 698 return tl_tpg->tl_fabric_prot_type; 699 } 700 701 static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl( 702 struct se_portal_group *se_tpg) 703 { 704 return kzalloc(sizeof(struct se_node_acl), GFP_KERNEL); 705 } 706 707 static void tcm_loop_tpg_release_fabric_acl( 708 struct se_portal_group *se_tpg, 709 struct se_node_acl *se_nacl) 710 { 711 kfree(se_nacl); 712 } 713 714 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) 715 { 716 return 1; 717 } 718 719 static u32 tcm_loop_sess_get_index(struct se_session *se_sess) 720 { 721 return 1; 722 } 723 724 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) 725 { 726 return; 727 } 728 729 static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd) 730 { 731 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 732 struct tcm_loop_cmd, tl_se_cmd); 733 734 return tl_cmd->sc_cmd_tag; 735 } 736 737 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) 738 { 739 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 740 struct tcm_loop_cmd, tl_se_cmd); 741 742 return tl_cmd->sc_cmd_state; 743 } 744 745 static int tcm_loop_shutdown_session(struct se_session *se_sess) 746 { 747 return 0; 748 } 749 750 static void tcm_loop_close_session(struct se_session *se_sess) 751 { 752 return; 753 }; 754 755 static int tcm_loop_write_pending(struct se_cmd *se_cmd) 756 { 757 /* 758 * Since Linux/SCSI has already sent down a struct scsi_cmnd 759 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array 760 * memory, and memory has already been mapped to struct se_cmd->t_mem_list 761 * format with transport_generic_map_mem_to_cmd(). 762 * 763 * We now tell TCM to add this WRITE CDB directly into the TCM storage 764 * object execution queue. 765 */ 766 target_execute_cmd(se_cmd); 767 return 0; 768 } 769 770 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) 771 { 772 return 0; 773 } 774 775 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) 776 { 777 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 778 struct tcm_loop_cmd, tl_se_cmd); 779 struct scsi_cmnd *sc = tl_cmd->sc; 780 781 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" 782 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 783 784 sc->result = SAM_STAT_GOOD; 785 set_host_byte(sc, DID_OK); 786 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 787 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 788 scsi_set_resid(sc, se_cmd->residual_count); 789 sc->scsi_done(sc); 790 return 0; 791 } 792 793 static int tcm_loop_queue_status(struct se_cmd *se_cmd) 794 { 795 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 796 struct tcm_loop_cmd, tl_se_cmd); 797 struct scsi_cmnd *sc = tl_cmd->sc; 798 799 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" 800 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 801 802 if (se_cmd->sense_buffer && 803 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 804 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 805 806 memcpy(sc->sense_buffer, se_cmd->sense_buffer, 807 SCSI_SENSE_BUFFERSIZE); 808 sc->result = SAM_STAT_CHECK_CONDITION; 809 set_driver_byte(sc, DRIVER_SENSE); 810 } else 811 sc->result = se_cmd->scsi_status; 812 813 set_host_byte(sc, DID_OK); 814 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 815 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 816 scsi_set_resid(sc, se_cmd->residual_count); 817 sc->scsi_done(sc); 818 return 0; 819 } 820 821 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) 822 { 823 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; 824 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; 825 /* 826 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead 827 * and wake up the wait_queue_head_t in tcm_loop_device_reset() 828 */ 829 atomic_set(&tl_tmr->tmr_complete, 1); 830 wake_up(&tl_tmr->tl_tmr_wait); 831 } 832 833 static void tcm_loop_aborted_task(struct se_cmd *se_cmd) 834 { 835 return; 836 } 837 838 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) 839 { 840 switch (tl_hba->tl_proto_id) { 841 case SCSI_PROTOCOL_SAS: 842 return "SAS"; 843 case SCSI_PROTOCOL_FCP: 844 return "FCP"; 845 case SCSI_PROTOCOL_ISCSI: 846 return "iSCSI"; 847 default: 848 break; 849 } 850 851 return "Unknown"; 852 } 853 854 /* Start items for tcm_loop_port_cit */ 855 856 static int tcm_loop_port_link( 857 struct se_portal_group *se_tpg, 858 struct se_lun *lun) 859 { 860 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 861 struct tcm_loop_tpg, tl_se_tpg); 862 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 863 864 atomic_inc_mb(&tl_tpg->tl_tpg_port_count); 865 /* 866 * Add Linux/SCSI struct scsi_device by HCTL 867 */ 868 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); 869 870 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); 871 return 0; 872 } 873 874 static void tcm_loop_port_unlink( 875 struct se_portal_group *se_tpg, 876 struct se_lun *se_lun) 877 { 878 struct scsi_device *sd; 879 struct tcm_loop_hba *tl_hba; 880 struct tcm_loop_tpg *tl_tpg; 881 882 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); 883 tl_hba = tl_tpg->tl_hba; 884 885 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, 886 se_lun->unpacked_lun); 887 if (!sd) { 888 pr_err("Unable to locate struct scsi_device for %d:%d:" 889 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); 890 return; 891 } 892 /* 893 * Remove Linux/SCSI struct scsi_device by HCTL 894 */ 895 scsi_remove_device(sd); 896 scsi_device_put(sd); 897 898 atomic_dec_mb(&tl_tpg->tl_tpg_port_count); 899 900 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); 901 } 902 903 /* End items for tcm_loop_port_cit */ 904 905 static ssize_t tcm_loop_tpg_attrib_show_fabric_prot_type( 906 struct se_portal_group *se_tpg, 907 char *page) 908 { 909 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 910 tl_se_tpg); 911 912 return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type); 913 } 914 915 static ssize_t tcm_loop_tpg_attrib_store_fabric_prot_type( 916 struct se_portal_group *se_tpg, 917 const char *page, 918 size_t count) 919 { 920 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 921 tl_se_tpg); 922 unsigned long val; 923 int ret = kstrtoul(page, 0, &val); 924 925 if (ret) { 926 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); 927 return ret; 928 } 929 if (val != 0 && val != 1 && val != 3) { 930 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val); 931 return -EINVAL; 932 } 933 tl_tpg->tl_fabric_prot_type = val; 934 935 return count; 936 } 937 938 TF_TPG_ATTRIB_ATTR(tcm_loop, fabric_prot_type, S_IRUGO | S_IWUSR); 939 940 static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = { 941 &tcm_loop_tpg_attrib_fabric_prot_type.attr, 942 NULL, 943 }; 944 945 /* Start items for tcm_loop_nexus_cit */ 946 947 static int tcm_loop_make_nexus( 948 struct tcm_loop_tpg *tl_tpg, 949 const char *name) 950 { 951 struct se_portal_group *se_tpg; 952 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 953 struct tcm_loop_nexus *tl_nexus; 954 int ret = -ENOMEM; 955 956 if (tl_tpg->tl_nexus) { 957 pr_debug("tl_tpg->tl_nexus already exists\n"); 958 return -EEXIST; 959 } 960 se_tpg = &tl_tpg->tl_se_tpg; 961 962 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); 963 if (!tl_nexus) { 964 pr_err("Unable to allocate struct tcm_loop_nexus\n"); 965 return -ENOMEM; 966 } 967 /* 968 * Initialize the struct se_session pointer 969 */ 970 tl_nexus->se_sess = transport_init_session( 971 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS); 972 if (IS_ERR(tl_nexus->se_sess)) { 973 ret = PTR_ERR(tl_nexus->se_sess); 974 goto out; 975 } 976 /* 977 * Since we are running in 'demo mode' this call with generate a 978 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI 979 * Initiator port name of the passed configfs group 'name'. 980 */ 981 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 982 se_tpg, (unsigned char *)name); 983 if (!tl_nexus->se_sess->se_node_acl) { 984 transport_free_session(tl_nexus->se_sess); 985 goto out; 986 } 987 /* Now, register the SAS I_T Nexus as active. */ 988 transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, 989 tl_nexus->se_sess, tl_nexus); 990 tl_tpg->tl_nexus = tl_nexus; 991 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" 992 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), 993 name); 994 return 0; 995 996 out: 997 kfree(tl_nexus); 998 return ret; 999 } 1000 1001 static int tcm_loop_drop_nexus( 1002 struct tcm_loop_tpg *tpg) 1003 { 1004 struct se_session *se_sess; 1005 struct tcm_loop_nexus *tl_nexus; 1006 1007 tl_nexus = tpg->tl_nexus; 1008 if (!tl_nexus) 1009 return -ENODEV; 1010 1011 se_sess = tl_nexus->se_sess; 1012 if (!se_sess) 1013 return -ENODEV; 1014 1015 if (atomic_read(&tpg->tl_tpg_port_count)) { 1016 pr_err("Unable to remove TCM_Loop I_T Nexus with" 1017 " active TPG port count: %d\n", 1018 atomic_read(&tpg->tl_tpg_port_count)); 1019 return -EPERM; 1020 } 1021 1022 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" 1023 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba), 1024 tl_nexus->se_sess->se_node_acl->initiatorname); 1025 /* 1026 * Release the SCSI I_T Nexus to the emulated SAS Target Port 1027 */ 1028 transport_deregister_session(tl_nexus->se_sess); 1029 tpg->tl_nexus = NULL; 1030 kfree(tl_nexus); 1031 return 0; 1032 } 1033 1034 /* End items for tcm_loop_nexus_cit */ 1035 1036 static ssize_t tcm_loop_tpg_show_nexus( 1037 struct se_portal_group *se_tpg, 1038 char *page) 1039 { 1040 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1041 struct tcm_loop_tpg, tl_se_tpg); 1042 struct tcm_loop_nexus *tl_nexus; 1043 ssize_t ret; 1044 1045 tl_nexus = tl_tpg->tl_nexus; 1046 if (!tl_nexus) 1047 return -ENODEV; 1048 1049 ret = snprintf(page, PAGE_SIZE, "%s\n", 1050 tl_nexus->se_sess->se_node_acl->initiatorname); 1051 1052 return ret; 1053 } 1054 1055 static ssize_t tcm_loop_tpg_store_nexus( 1056 struct se_portal_group *se_tpg, 1057 const char *page, 1058 size_t count) 1059 { 1060 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1061 struct tcm_loop_tpg, tl_se_tpg); 1062 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 1063 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; 1064 int ret; 1065 /* 1066 * Shutdown the active I_T nexus if 'NULL' is passed.. 1067 */ 1068 if (!strncmp(page, "NULL", 4)) { 1069 ret = tcm_loop_drop_nexus(tl_tpg); 1070 return (!ret) ? count : ret; 1071 } 1072 /* 1073 * Otherwise make sure the passed virtual Initiator port WWN matches 1074 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call 1075 * tcm_loop_make_nexus() 1076 */ 1077 if (strlen(page) >= TL_WWN_ADDR_LEN) { 1078 pr_err("Emulated NAA Sas Address: %s, exceeds" 1079 " max: %d\n", page, TL_WWN_ADDR_LEN); 1080 return -EINVAL; 1081 } 1082 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); 1083 1084 ptr = strstr(i_port, "naa."); 1085 if (ptr) { 1086 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { 1087 pr_err("Passed SAS Initiator Port %s does not" 1088 " match target port protoid: %s\n", i_port, 1089 tcm_loop_dump_proto_id(tl_hba)); 1090 return -EINVAL; 1091 } 1092 port_ptr = &i_port[0]; 1093 goto check_newline; 1094 } 1095 ptr = strstr(i_port, "fc."); 1096 if (ptr) { 1097 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { 1098 pr_err("Passed FCP Initiator Port %s does not" 1099 " match target port protoid: %s\n", i_port, 1100 tcm_loop_dump_proto_id(tl_hba)); 1101 return -EINVAL; 1102 } 1103 port_ptr = &i_port[3]; /* Skip over "fc." */ 1104 goto check_newline; 1105 } 1106 ptr = strstr(i_port, "iqn."); 1107 if (ptr) { 1108 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { 1109 pr_err("Passed iSCSI Initiator Port %s does not" 1110 " match target port protoid: %s\n", i_port, 1111 tcm_loop_dump_proto_id(tl_hba)); 1112 return -EINVAL; 1113 } 1114 port_ptr = &i_port[0]; 1115 goto check_newline; 1116 } 1117 pr_err("Unable to locate prefix for emulated Initiator Port:" 1118 " %s\n", i_port); 1119 return -EINVAL; 1120 /* 1121 * Clear any trailing newline for the NAA WWN 1122 */ 1123 check_newline: 1124 if (i_port[strlen(i_port)-1] == '\n') 1125 i_port[strlen(i_port)-1] = '\0'; 1126 1127 ret = tcm_loop_make_nexus(tl_tpg, port_ptr); 1128 if (ret < 0) 1129 return ret; 1130 1131 return count; 1132 } 1133 1134 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); 1135 1136 static ssize_t tcm_loop_tpg_show_transport_status( 1137 struct se_portal_group *se_tpg, 1138 char *page) 1139 { 1140 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1141 struct tcm_loop_tpg, tl_se_tpg); 1142 const char *status = NULL; 1143 ssize_t ret = -EINVAL; 1144 1145 switch (tl_tpg->tl_transport_status) { 1146 case TCM_TRANSPORT_ONLINE: 1147 status = "online"; 1148 break; 1149 case TCM_TRANSPORT_OFFLINE: 1150 status = "offline"; 1151 break; 1152 default: 1153 break; 1154 } 1155 1156 if (status) 1157 ret = snprintf(page, PAGE_SIZE, "%s\n", status); 1158 1159 return ret; 1160 } 1161 1162 static ssize_t tcm_loop_tpg_store_transport_status( 1163 struct se_portal_group *se_tpg, 1164 const char *page, 1165 size_t count) 1166 { 1167 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1168 struct tcm_loop_tpg, tl_se_tpg); 1169 1170 if (!strncmp(page, "online", 6)) { 1171 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; 1172 return count; 1173 } 1174 if (!strncmp(page, "offline", 7)) { 1175 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE; 1176 return count; 1177 } 1178 return -EINVAL; 1179 } 1180 1181 TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR); 1182 1183 static struct configfs_attribute *tcm_loop_tpg_attrs[] = { 1184 &tcm_loop_tpg_nexus.attr, 1185 &tcm_loop_tpg_transport_status.attr, 1186 NULL, 1187 }; 1188 1189 /* Start items for tcm_loop_naa_cit */ 1190 1191 static struct se_portal_group *tcm_loop_make_naa_tpg( 1192 struct se_wwn *wwn, 1193 struct config_group *group, 1194 const char *name) 1195 { 1196 struct tcm_loop_hba *tl_hba = container_of(wwn, 1197 struct tcm_loop_hba, tl_hba_wwn); 1198 struct tcm_loop_tpg *tl_tpg; 1199 int ret; 1200 unsigned long tpgt; 1201 1202 if (strstr(name, "tpgt_") != name) { 1203 pr_err("Unable to locate \"tpgt_#\" directory" 1204 " group\n"); 1205 return ERR_PTR(-EINVAL); 1206 } 1207 if (kstrtoul(name+5, 10, &tpgt)) 1208 return ERR_PTR(-EINVAL); 1209 1210 if (tpgt >= TL_TPGS_PER_HBA) { 1211 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA:" 1212 " %u\n", tpgt, TL_TPGS_PER_HBA); 1213 return ERR_PTR(-EINVAL); 1214 } 1215 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; 1216 tl_tpg->tl_hba = tl_hba; 1217 tl_tpg->tl_tpgt = tpgt; 1218 /* 1219 * Register the tl_tpg as a emulated SAS TCM Target Endpoint 1220 */ 1221 ret = core_tpg_register(&loop_ops, wwn, &tl_tpg->tl_se_tpg, tl_tpg, 1222 TRANSPORT_TPG_TYPE_NORMAL); 1223 if (ret < 0) 1224 return ERR_PTR(-ENOMEM); 1225 1226 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" 1227 " Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba), 1228 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1229 1230 return &tl_tpg->tl_se_tpg; 1231 } 1232 1233 static void tcm_loop_drop_naa_tpg( 1234 struct se_portal_group *se_tpg) 1235 { 1236 struct se_wwn *wwn = se_tpg->se_tpg_wwn; 1237 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1238 struct tcm_loop_tpg, tl_se_tpg); 1239 struct tcm_loop_hba *tl_hba; 1240 unsigned short tpgt; 1241 1242 tl_hba = tl_tpg->tl_hba; 1243 tpgt = tl_tpg->tl_tpgt; 1244 /* 1245 * Release the I_T Nexus for the Virtual SAS link if present 1246 */ 1247 tcm_loop_drop_nexus(tl_tpg); 1248 /* 1249 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint 1250 */ 1251 core_tpg_deregister(se_tpg); 1252 1253 tl_tpg->tl_hba = NULL; 1254 tl_tpg->tl_tpgt = 0; 1255 1256 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" 1257 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), 1258 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1259 } 1260 1261 /* End items for tcm_loop_naa_cit */ 1262 1263 /* Start items for tcm_loop_cit */ 1264 1265 static struct se_wwn *tcm_loop_make_scsi_hba( 1266 struct target_fabric_configfs *tf, 1267 struct config_group *group, 1268 const char *name) 1269 { 1270 struct tcm_loop_hba *tl_hba; 1271 struct Scsi_Host *sh; 1272 char *ptr; 1273 int ret, off = 0; 1274 1275 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); 1276 if (!tl_hba) { 1277 pr_err("Unable to allocate struct tcm_loop_hba\n"); 1278 return ERR_PTR(-ENOMEM); 1279 } 1280 /* 1281 * Determine the emulated Protocol Identifier and Target Port Name 1282 * based on the incoming configfs directory name. 1283 */ 1284 ptr = strstr(name, "naa."); 1285 if (ptr) { 1286 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; 1287 goto check_len; 1288 } 1289 ptr = strstr(name, "fc."); 1290 if (ptr) { 1291 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; 1292 off = 3; /* Skip over "fc." */ 1293 goto check_len; 1294 } 1295 ptr = strstr(name, "iqn."); 1296 if (!ptr) { 1297 pr_err("Unable to locate prefix for emulated Target " 1298 "Port: %s\n", name); 1299 ret = -EINVAL; 1300 goto out; 1301 } 1302 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; 1303 1304 check_len: 1305 if (strlen(name) >= TL_WWN_ADDR_LEN) { 1306 pr_err("Emulated NAA %s Address: %s, exceeds" 1307 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), 1308 TL_WWN_ADDR_LEN); 1309 ret = -EINVAL; 1310 goto out; 1311 } 1312 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); 1313 1314 /* 1315 * Call device_register(tl_hba->dev) to register the emulated 1316 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after 1317 * device_register() callbacks in tcm_loop_driver_probe() 1318 */ 1319 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); 1320 if (ret) 1321 goto out; 1322 1323 sh = tl_hba->sh; 1324 tcm_loop_hba_no_cnt++; 1325 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" 1326 " %s Address: %s at Linux/SCSI Host ID: %d\n", 1327 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); 1328 1329 return &tl_hba->tl_hba_wwn; 1330 out: 1331 kfree(tl_hba); 1332 return ERR_PTR(ret); 1333 } 1334 1335 static void tcm_loop_drop_scsi_hba( 1336 struct se_wwn *wwn) 1337 { 1338 struct tcm_loop_hba *tl_hba = container_of(wwn, 1339 struct tcm_loop_hba, tl_hba_wwn); 1340 1341 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target" 1342 " SAS Address: %s at Linux/SCSI Host ID: %d\n", 1343 tl_hba->tl_wwn_address, tl_hba->sh->host_no); 1344 /* 1345 * Call device_unregister() on the original tl_hba->dev. 1346 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will 1347 * release *tl_hba; 1348 */ 1349 device_unregister(&tl_hba->dev); 1350 } 1351 1352 /* Start items for tcm_loop_cit */ 1353 static ssize_t tcm_loop_wwn_show_attr_version( 1354 struct target_fabric_configfs *tf, 1355 char *page) 1356 { 1357 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); 1358 } 1359 1360 TF_WWN_ATTR_RO(tcm_loop, version); 1361 1362 static struct configfs_attribute *tcm_loop_wwn_attrs[] = { 1363 &tcm_loop_wwn_version.attr, 1364 NULL, 1365 }; 1366 1367 /* End items for tcm_loop_cit */ 1368 1369 static const struct target_core_fabric_ops loop_ops = { 1370 .module = THIS_MODULE, 1371 .name = "loopback", 1372 .get_fabric_name = tcm_loop_get_fabric_name, 1373 .get_fabric_proto_ident = tcm_loop_get_fabric_proto_ident, 1374 .tpg_get_wwn = tcm_loop_get_endpoint_wwn, 1375 .tpg_get_tag = tcm_loop_get_tag, 1376 .tpg_get_pr_transport_id = tcm_loop_get_pr_transport_id, 1377 .tpg_get_pr_transport_id_len = tcm_loop_get_pr_transport_id_len, 1378 .tpg_parse_pr_out_transport_id = tcm_loop_parse_pr_out_transport_id, 1379 .tpg_check_demo_mode = tcm_loop_check_demo_mode, 1380 .tpg_check_demo_mode_cache = tcm_loop_check_demo_mode_cache, 1381 .tpg_check_demo_mode_write_protect = 1382 tcm_loop_check_demo_mode_write_protect, 1383 .tpg_check_prod_mode_write_protect = 1384 tcm_loop_check_prod_mode_write_protect, 1385 .tpg_check_prot_fabric_only = tcm_loop_check_prot_fabric_only, 1386 .tpg_alloc_fabric_acl = tcm_loop_tpg_alloc_fabric_acl, 1387 .tpg_release_fabric_acl = tcm_loop_tpg_release_fabric_acl, 1388 .tpg_get_inst_index = tcm_loop_get_inst_index, 1389 .check_stop_free = tcm_loop_check_stop_free, 1390 .release_cmd = tcm_loop_release_cmd, 1391 .shutdown_session = tcm_loop_shutdown_session, 1392 .close_session = tcm_loop_close_session, 1393 .sess_get_index = tcm_loop_sess_get_index, 1394 .write_pending = tcm_loop_write_pending, 1395 .write_pending_status = tcm_loop_write_pending_status, 1396 .set_default_node_attributes = tcm_loop_set_default_node_attributes, 1397 .get_task_tag = tcm_loop_get_task_tag, 1398 .get_cmd_state = tcm_loop_get_cmd_state, 1399 .queue_data_in = tcm_loop_queue_data_in, 1400 .queue_status = tcm_loop_queue_status, 1401 .queue_tm_rsp = tcm_loop_queue_tm_rsp, 1402 .aborted_task = tcm_loop_aborted_task, 1403 .fabric_make_wwn = tcm_loop_make_scsi_hba, 1404 .fabric_drop_wwn = tcm_loop_drop_scsi_hba, 1405 .fabric_make_tpg = tcm_loop_make_naa_tpg, 1406 .fabric_drop_tpg = tcm_loop_drop_naa_tpg, 1407 .fabric_post_link = tcm_loop_port_link, 1408 .fabric_pre_unlink = tcm_loop_port_unlink, 1409 .tfc_wwn_attrs = tcm_loop_wwn_attrs, 1410 .tfc_tpg_base_attrs = tcm_loop_tpg_attrs, 1411 .tfc_tpg_attrib_attrs = tcm_loop_tpg_attrib_attrs, 1412 }; 1413 1414 static int __init tcm_loop_fabric_init(void) 1415 { 1416 int ret = -ENOMEM; 1417 1418 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0); 1419 if (!tcm_loop_workqueue) 1420 goto out; 1421 1422 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", 1423 sizeof(struct tcm_loop_cmd), 1424 __alignof__(struct tcm_loop_cmd), 1425 0, NULL); 1426 if (!tcm_loop_cmd_cache) { 1427 pr_debug("kmem_cache_create() for" 1428 " tcm_loop_cmd_cache failed\n"); 1429 goto out_destroy_workqueue; 1430 } 1431 1432 ret = tcm_loop_alloc_core_bus(); 1433 if (ret) 1434 goto out_destroy_cache; 1435 1436 ret = target_register_template(&loop_ops); 1437 if (ret) 1438 goto out_release_core_bus; 1439 1440 return 0; 1441 1442 out_release_core_bus: 1443 tcm_loop_release_core_bus(); 1444 out_destroy_cache: 1445 kmem_cache_destroy(tcm_loop_cmd_cache); 1446 out_destroy_workqueue: 1447 destroy_workqueue(tcm_loop_workqueue); 1448 out: 1449 return ret; 1450 } 1451 1452 static void __exit tcm_loop_fabric_exit(void) 1453 { 1454 target_unregister_template(&loop_ops); 1455 tcm_loop_release_core_bus(); 1456 kmem_cache_destroy(tcm_loop_cmd_cache); 1457 destroy_workqueue(tcm_loop_workqueue); 1458 } 1459 1460 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); 1461 MODULE_AUTHOR("Nicholas A. Bellinger <[email protected]>"); 1462 MODULE_LICENSE("GPL"); 1463 module_init(tcm_loop_fabric_init); 1464 module_exit(tcm_loop_fabric_exit); 1465