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