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 44static const struct target_core_fabric_ops loop_ops; 45 46static struct workqueue_struct *tcm_loop_workqueue; 47static struct kmem_cache *tcm_loop_cmd_cache; 48 49static int tcm_loop_hba_no_cnt; 50 51static int tcm_loop_queue_status(struct se_cmd *se_cmd); 52 53/* 54 * Called from struct target_core_fabric_ops->check_stop_free() 55 */ 56static 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 73static 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 81static 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 87static int tcm_loop_driver_probe(struct device *); 88static int tcm_loop_driver_remove(struct device *); 89 90static int pseudo_lld_bus_match(struct device *dev, 91 struct device_driver *dev_driver) 92{ 93 return 1; 94} 95 96static 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 103static 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 */ 110static struct device *tcm_loop_primary; 111 112static 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 181out_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 */ 191static 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 */ 219static 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; 288release: 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 297static 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 */ 317static 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 334static 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 359static 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 365static 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 386static 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 = TL_SCSI_MAX_CMD_LEN; 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 430static 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 443static 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 */ 453static 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 */ 476static 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 502bus_unreg: 503 bus_unregister(&tcm_loop_lld_bus); 504dev_unreg: 505 root_device_unregister(tcm_loop_primary); 506 return ret; 507} 508 509static 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 518static char *tcm_loop_get_fabric_name(void) 519{ 520 return "loopback"; 521} 522 523static 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 550static 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 559static 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 569static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg) 570{ 571 return 1; 572} 573 574static u32 tcm_loop_get_pr_transport_id( 575 struct se_portal_group *se_tpg, 576 struct se_node_acl *se_nacl, 577 struct t10_pr_registration *pr_reg, 578 int *format_code, 579 unsigned char *buf) 580{ 581 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 582 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 583 584 switch (tl_hba->tl_proto_id) { 585 case SCSI_PROTOCOL_SAS: 586 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 587 format_code, buf); 588 case SCSI_PROTOCOL_FCP: 589 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 590 format_code, buf); 591 case SCSI_PROTOCOL_ISCSI: 592 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 593 format_code, buf); 594 default: 595 pr_err("Unknown tl_proto_id: 0x%02x, using" 596 " SAS emulation\n", tl_hba->tl_proto_id); 597 break; 598 } 599 600 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 601 format_code, buf); 602} 603 604static u32 tcm_loop_get_pr_transport_id_len( 605 struct se_portal_group *se_tpg, 606 struct se_node_acl *se_nacl, 607 struct t10_pr_registration *pr_reg, 608 int *format_code) 609{ 610 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 611 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 612 613 switch (tl_hba->tl_proto_id) { 614 case SCSI_PROTOCOL_SAS: 615 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 616 format_code); 617 case SCSI_PROTOCOL_FCP: 618 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 619 format_code); 620 case SCSI_PROTOCOL_ISCSI: 621 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 622 format_code); 623 default: 624 pr_err("Unknown tl_proto_id: 0x%02x, using" 625 " SAS emulation\n", tl_hba->tl_proto_id); 626 break; 627 } 628 629 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 630 format_code); 631} 632 633/* 634 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above 635 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. 636 */ 637static char *tcm_loop_parse_pr_out_transport_id( 638 struct se_portal_group *se_tpg, 639 const char *buf, 640 u32 *out_tid_len, 641 char **port_nexus_ptr) 642{ 643 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 644 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 645 646 switch (tl_hba->tl_proto_id) { 647 case SCSI_PROTOCOL_SAS: 648 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 649 port_nexus_ptr); 650 case SCSI_PROTOCOL_FCP: 651 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 652 port_nexus_ptr); 653 case SCSI_PROTOCOL_ISCSI: 654 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 655 port_nexus_ptr); 656 default: 657 pr_err("Unknown tl_proto_id: 0x%02x, using" 658 " SAS emulation\n", tl_hba->tl_proto_id); 659 break; 660 } 661 662 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 663 port_nexus_ptr); 664} 665 666/* 667 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated 668 * based upon the incoming fabric dependent SCSI Initiator Port 669 */ 670static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) 671{ 672 return 1; 673} 674 675static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) 676{ 677 return 0; 678} 679 680/* 681 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for 682 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest 683 */ 684static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) 685{ 686 return 0; 687} 688 689/* 690 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will 691 * never be called for TCM_Loop by target_core_fabric_configfs.c code. 692 * It has been added here as a nop for target_fabric_tf_ops_check() 693 */ 694static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) 695{ 696 return 0; 697} 698 699static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg) 700{ 701 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 702 tl_se_tpg); 703 return tl_tpg->tl_fabric_prot_type; 704} 705 706static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl( 707 struct se_portal_group *se_tpg) 708{ 709 struct tcm_loop_nacl *tl_nacl; 710 711 tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL); 712 if (!tl_nacl) { 713 pr_err("Unable to allocate struct tcm_loop_nacl\n"); 714 return NULL; 715 } 716 717 return &tl_nacl->se_node_acl; 718} 719 720static void tcm_loop_tpg_release_fabric_acl( 721 struct se_portal_group *se_tpg, 722 struct se_node_acl *se_nacl) 723{ 724 struct tcm_loop_nacl *tl_nacl = container_of(se_nacl, 725 struct tcm_loop_nacl, se_node_acl); 726 727 kfree(tl_nacl); 728} 729 730static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) 731{ 732 return 1; 733} 734 735static u32 tcm_loop_sess_get_index(struct se_session *se_sess) 736{ 737 return 1; 738} 739 740static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) 741{ 742 return; 743} 744 745static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd) 746{ 747 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 748 struct tcm_loop_cmd, tl_se_cmd); 749 750 return tl_cmd->sc_cmd_tag; 751} 752 753static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) 754{ 755 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 756 struct tcm_loop_cmd, tl_se_cmd); 757 758 return tl_cmd->sc_cmd_state; 759} 760 761static int tcm_loop_shutdown_session(struct se_session *se_sess) 762{ 763 return 0; 764} 765 766static void tcm_loop_close_session(struct se_session *se_sess) 767{ 768 return; 769}; 770 771static int tcm_loop_write_pending(struct se_cmd *se_cmd) 772{ 773 /* 774 * Since Linux/SCSI has already sent down a struct scsi_cmnd 775 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array 776 * memory, and memory has already been mapped to struct se_cmd->t_mem_list 777 * format with transport_generic_map_mem_to_cmd(). 778 * 779 * We now tell TCM to add this WRITE CDB directly into the TCM storage 780 * object execution queue. 781 */ 782 target_execute_cmd(se_cmd); 783 return 0; 784} 785 786static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) 787{ 788 return 0; 789} 790 791static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) 792{ 793 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 794 struct tcm_loop_cmd, tl_se_cmd); 795 struct scsi_cmnd *sc = tl_cmd->sc; 796 797 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" 798 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 799 800 sc->result = SAM_STAT_GOOD; 801 set_host_byte(sc, DID_OK); 802 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 803 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 804 scsi_set_resid(sc, se_cmd->residual_count); 805 sc->scsi_done(sc); 806 return 0; 807} 808 809static int tcm_loop_queue_status(struct se_cmd *se_cmd) 810{ 811 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 812 struct tcm_loop_cmd, tl_se_cmd); 813 struct scsi_cmnd *sc = tl_cmd->sc; 814 815 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" 816 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 817 818 if (se_cmd->sense_buffer && 819 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 820 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 821 822 memcpy(sc->sense_buffer, se_cmd->sense_buffer, 823 SCSI_SENSE_BUFFERSIZE); 824 sc->result = SAM_STAT_CHECK_CONDITION; 825 set_driver_byte(sc, DRIVER_SENSE); 826 } else 827 sc->result = se_cmd->scsi_status; 828 829 set_host_byte(sc, DID_OK); 830 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || 831 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) 832 scsi_set_resid(sc, se_cmd->residual_count); 833 sc->scsi_done(sc); 834 return 0; 835} 836 837static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) 838{ 839 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; 840 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; 841 /* 842 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead 843 * and wake up the wait_queue_head_t in tcm_loop_device_reset() 844 */ 845 atomic_set(&tl_tmr->tmr_complete, 1); 846 wake_up(&tl_tmr->tl_tmr_wait); 847} 848 849static void tcm_loop_aborted_task(struct se_cmd *se_cmd) 850{ 851 return; 852} 853 854static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) 855{ 856 switch (tl_hba->tl_proto_id) { 857 case SCSI_PROTOCOL_SAS: 858 return "SAS"; 859 case SCSI_PROTOCOL_FCP: 860 return "FCP"; 861 case SCSI_PROTOCOL_ISCSI: 862 return "iSCSI"; 863 default: 864 break; 865 } 866 867 return "Unknown"; 868} 869 870/* Start items for tcm_loop_port_cit */ 871 872static int tcm_loop_port_link( 873 struct se_portal_group *se_tpg, 874 struct se_lun *lun) 875{ 876 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 877 struct tcm_loop_tpg, tl_se_tpg); 878 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 879 880 atomic_inc_mb(&tl_tpg->tl_tpg_port_count); 881 /* 882 * Add Linux/SCSI struct scsi_device by HCTL 883 */ 884 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); 885 886 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); 887 return 0; 888} 889 890static void tcm_loop_port_unlink( 891 struct se_portal_group *se_tpg, 892 struct se_lun *se_lun) 893{ 894 struct scsi_device *sd; 895 struct tcm_loop_hba *tl_hba; 896 struct tcm_loop_tpg *tl_tpg; 897 898 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); 899 tl_hba = tl_tpg->tl_hba; 900 901 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, 902 se_lun->unpacked_lun); 903 if (!sd) { 904 pr_err("Unable to locate struct scsi_device for %d:%d:" 905 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); 906 return; 907 } 908 /* 909 * Remove Linux/SCSI struct scsi_device by HCTL 910 */ 911 scsi_remove_device(sd); 912 scsi_device_put(sd); 913 914 atomic_dec_mb(&tl_tpg->tl_tpg_port_count); 915 916 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); 917} 918 919/* End items for tcm_loop_port_cit */ 920 921static ssize_t tcm_loop_tpg_attrib_show_fabric_prot_type( 922 struct se_portal_group *se_tpg, 923 char *page) 924{ 925 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 926 tl_se_tpg); 927 928 return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type); 929} 930 931static ssize_t tcm_loop_tpg_attrib_store_fabric_prot_type( 932 struct se_portal_group *se_tpg, 933 const char *page, 934 size_t count) 935{ 936 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, 937 tl_se_tpg); 938 unsigned long val; 939 int ret = kstrtoul(page, 0, &val); 940 941 if (ret) { 942 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); 943 return ret; 944 } 945 if (val != 0 && val != 1 && val != 3) { 946 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val); 947 return -EINVAL; 948 } 949 tl_tpg->tl_fabric_prot_type = val; 950 951 return count; 952} 953 954TF_TPG_ATTRIB_ATTR(tcm_loop, fabric_prot_type, S_IRUGO | S_IWUSR); 955 956static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = { 957 &tcm_loop_tpg_attrib_fabric_prot_type.attr, 958 NULL, 959}; 960 961/* Start items for tcm_loop_nexus_cit */ 962 963static int tcm_loop_make_nexus( 964 struct tcm_loop_tpg *tl_tpg, 965 const char *name) 966{ 967 struct se_portal_group *se_tpg; 968 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 969 struct tcm_loop_nexus *tl_nexus; 970 int ret = -ENOMEM; 971 972 if (tl_tpg->tl_nexus) { 973 pr_debug("tl_tpg->tl_nexus already exists\n"); 974 return -EEXIST; 975 } 976 se_tpg = &tl_tpg->tl_se_tpg; 977 978 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); 979 if (!tl_nexus) { 980 pr_err("Unable to allocate struct tcm_loop_nexus\n"); 981 return -ENOMEM; 982 } 983 /* 984 * Initialize the struct se_session pointer 985 */ 986 tl_nexus->se_sess = transport_init_session( 987 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS); 988 if (IS_ERR(tl_nexus->se_sess)) { 989 ret = PTR_ERR(tl_nexus->se_sess); 990 goto out; 991 } 992 /* 993 * Since we are running in 'demo mode' this call with generate a 994 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI 995 * Initiator port name of the passed configfs group 'name'. 996 */ 997 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 998 se_tpg, (unsigned char *)name); 999 if (!tl_nexus->se_sess->se_node_acl) { 1000 transport_free_session(tl_nexus->se_sess); 1001 goto out; 1002 } 1003 /* Now, register the SAS I_T Nexus as active. */ 1004 transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, 1005 tl_nexus->se_sess, tl_nexus); 1006 tl_tpg->tl_nexus = tl_nexus; 1007 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" 1008 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), 1009 name); 1010 return 0; 1011 1012out: 1013 kfree(tl_nexus); 1014 return ret; 1015} 1016 1017static int tcm_loop_drop_nexus( 1018 struct tcm_loop_tpg *tpg) 1019{ 1020 struct se_session *se_sess; 1021 struct tcm_loop_nexus *tl_nexus; 1022 1023 tl_nexus = tpg->tl_nexus; 1024 if (!tl_nexus) 1025 return -ENODEV; 1026 1027 se_sess = tl_nexus->se_sess; 1028 if (!se_sess) 1029 return -ENODEV; 1030 1031 if (atomic_read(&tpg->tl_tpg_port_count)) { 1032 pr_err("Unable to remove TCM_Loop I_T Nexus with" 1033 " active TPG port count: %d\n", 1034 atomic_read(&tpg->tl_tpg_port_count)); 1035 return -EPERM; 1036 } 1037 1038 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" 1039 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba), 1040 tl_nexus->se_sess->se_node_acl->initiatorname); 1041 /* 1042 * Release the SCSI I_T Nexus to the emulated SAS Target Port 1043 */ 1044 transport_deregister_session(tl_nexus->se_sess); 1045 tpg->tl_nexus = NULL; 1046 kfree(tl_nexus); 1047 return 0; 1048} 1049 1050/* End items for tcm_loop_nexus_cit */ 1051 1052static ssize_t tcm_loop_tpg_show_nexus( 1053 struct se_portal_group *se_tpg, 1054 char *page) 1055{ 1056 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1057 struct tcm_loop_tpg, tl_se_tpg); 1058 struct tcm_loop_nexus *tl_nexus; 1059 ssize_t ret; 1060 1061 tl_nexus = tl_tpg->tl_nexus; 1062 if (!tl_nexus) 1063 return -ENODEV; 1064 1065 ret = snprintf(page, PAGE_SIZE, "%s\n", 1066 tl_nexus->se_sess->se_node_acl->initiatorname); 1067 1068 return ret; 1069} 1070 1071static ssize_t tcm_loop_tpg_store_nexus( 1072 struct se_portal_group *se_tpg, 1073 const char *page, 1074 size_t count) 1075{ 1076 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1077 struct tcm_loop_tpg, tl_se_tpg); 1078 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 1079 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; 1080 int ret; 1081 /* 1082 * Shutdown the active I_T nexus if 'NULL' is passed.. 1083 */ 1084 if (!strncmp(page, "NULL", 4)) { 1085 ret = tcm_loop_drop_nexus(tl_tpg); 1086 return (!ret) ? count : ret; 1087 } 1088 /* 1089 * Otherwise make sure the passed virtual Initiator port WWN matches 1090 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call 1091 * tcm_loop_make_nexus() 1092 */ 1093 if (strlen(page) >= TL_WWN_ADDR_LEN) { 1094 pr_err("Emulated NAA Sas Address: %s, exceeds" 1095 " max: %d\n", page, TL_WWN_ADDR_LEN); 1096 return -EINVAL; 1097 } 1098 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); 1099 1100 ptr = strstr(i_port, "naa."); 1101 if (ptr) { 1102 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { 1103 pr_err("Passed SAS Initiator Port %s does not" 1104 " match target port protoid: %s\n", i_port, 1105 tcm_loop_dump_proto_id(tl_hba)); 1106 return -EINVAL; 1107 } 1108 port_ptr = &i_port[0]; 1109 goto check_newline; 1110 } 1111 ptr = strstr(i_port, "fc."); 1112 if (ptr) { 1113 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { 1114 pr_err("Passed FCP Initiator Port %s does not" 1115 " match target port protoid: %s\n", i_port, 1116 tcm_loop_dump_proto_id(tl_hba)); 1117 return -EINVAL; 1118 } 1119 port_ptr = &i_port[3]; /* Skip over "fc." */ 1120 goto check_newline; 1121 } 1122 ptr = strstr(i_port, "iqn."); 1123 if (ptr) { 1124 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { 1125 pr_err("Passed iSCSI Initiator Port %s does not" 1126 " match target port protoid: %s\n", i_port, 1127 tcm_loop_dump_proto_id(tl_hba)); 1128 return -EINVAL; 1129 } 1130 port_ptr = &i_port[0]; 1131 goto check_newline; 1132 } 1133 pr_err("Unable to locate prefix for emulated Initiator Port:" 1134 " %s\n", i_port); 1135 return -EINVAL; 1136 /* 1137 * Clear any trailing newline for the NAA WWN 1138 */ 1139check_newline: 1140 if (i_port[strlen(i_port)-1] == '\n') 1141 i_port[strlen(i_port)-1] = '\0'; 1142 1143 ret = tcm_loop_make_nexus(tl_tpg, port_ptr); 1144 if (ret < 0) 1145 return ret; 1146 1147 return count; 1148} 1149 1150TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); 1151 1152static ssize_t tcm_loop_tpg_show_transport_status( 1153 struct se_portal_group *se_tpg, 1154 char *page) 1155{ 1156 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1157 struct tcm_loop_tpg, tl_se_tpg); 1158 const char *status = NULL; 1159 ssize_t ret = -EINVAL; 1160 1161 switch (tl_tpg->tl_transport_status) { 1162 case TCM_TRANSPORT_ONLINE: 1163 status = "online"; 1164 break; 1165 case TCM_TRANSPORT_OFFLINE: 1166 status = "offline"; 1167 break; 1168 default: 1169 break; 1170 } 1171 1172 if (status) 1173 ret = snprintf(page, PAGE_SIZE, "%s\n", status); 1174 1175 return ret; 1176} 1177 1178static ssize_t tcm_loop_tpg_store_transport_status( 1179 struct se_portal_group *se_tpg, 1180 const char *page, 1181 size_t count) 1182{ 1183 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1184 struct tcm_loop_tpg, tl_se_tpg); 1185 1186 if (!strncmp(page, "online", 6)) { 1187 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; 1188 return count; 1189 } 1190 if (!strncmp(page, "offline", 7)) { 1191 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE; 1192 return count; 1193 } 1194 return -EINVAL; 1195} 1196 1197TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR); 1198 1199static struct configfs_attribute *tcm_loop_tpg_attrs[] = { 1200 &tcm_loop_tpg_nexus.attr, 1201 &tcm_loop_tpg_transport_status.attr, 1202 NULL, 1203}; 1204 1205/* Start items for tcm_loop_naa_cit */ 1206 1207static struct se_portal_group *tcm_loop_make_naa_tpg( 1208 struct se_wwn *wwn, 1209 struct config_group *group, 1210 const char *name) 1211{ 1212 struct tcm_loop_hba *tl_hba = container_of(wwn, 1213 struct tcm_loop_hba, tl_hba_wwn); 1214 struct tcm_loop_tpg *tl_tpg; 1215 int ret; 1216 unsigned long tpgt; 1217 1218 if (strstr(name, "tpgt_") != name) { 1219 pr_err("Unable to locate \"tpgt_#\" directory" 1220 " group\n"); 1221 return ERR_PTR(-EINVAL); 1222 } 1223 if (kstrtoul(name+5, 10, &tpgt)) 1224 return ERR_PTR(-EINVAL); 1225 1226 if (tpgt >= TL_TPGS_PER_HBA) { 1227 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA:" 1228 " %u\n", tpgt, TL_TPGS_PER_HBA); 1229 return ERR_PTR(-EINVAL); 1230 } 1231 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; 1232 tl_tpg->tl_hba = tl_hba; 1233 tl_tpg->tl_tpgt = tpgt; 1234 /* 1235 * Register the tl_tpg as a emulated SAS TCM Target Endpoint 1236 */ 1237 ret = core_tpg_register(&loop_ops, wwn, &tl_tpg->tl_se_tpg, tl_tpg, 1238 TRANSPORT_TPG_TYPE_NORMAL); 1239 if (ret < 0) 1240 return ERR_PTR(-ENOMEM); 1241 1242 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" 1243 " Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba), 1244 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1245 1246 return &tl_tpg->tl_se_tpg; 1247} 1248 1249static void tcm_loop_drop_naa_tpg( 1250 struct se_portal_group *se_tpg) 1251{ 1252 struct se_wwn *wwn = se_tpg->se_tpg_wwn; 1253 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1254 struct tcm_loop_tpg, tl_se_tpg); 1255 struct tcm_loop_hba *tl_hba; 1256 unsigned short tpgt; 1257 1258 tl_hba = tl_tpg->tl_hba; 1259 tpgt = tl_tpg->tl_tpgt; 1260 /* 1261 * Release the I_T Nexus for the Virtual SAS link if present 1262 */ 1263 tcm_loop_drop_nexus(tl_tpg); 1264 /* 1265 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint 1266 */ 1267 core_tpg_deregister(se_tpg); 1268 1269 tl_tpg->tl_hba = NULL; 1270 tl_tpg->tl_tpgt = 0; 1271 1272 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" 1273 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), 1274 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1275} 1276 1277/* End items for tcm_loop_naa_cit */ 1278 1279/* Start items for tcm_loop_cit */ 1280 1281static struct se_wwn *tcm_loop_make_scsi_hba( 1282 struct target_fabric_configfs *tf, 1283 struct config_group *group, 1284 const char *name) 1285{ 1286 struct tcm_loop_hba *tl_hba; 1287 struct Scsi_Host *sh; 1288 char *ptr; 1289 int ret, off = 0; 1290 1291 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); 1292 if (!tl_hba) { 1293 pr_err("Unable to allocate struct tcm_loop_hba\n"); 1294 return ERR_PTR(-ENOMEM); 1295 } 1296 /* 1297 * Determine the emulated Protocol Identifier and Target Port Name 1298 * based on the incoming configfs directory name. 1299 */ 1300 ptr = strstr(name, "naa."); 1301 if (ptr) { 1302 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; 1303 goto check_len; 1304 } 1305 ptr = strstr(name, "fc."); 1306 if (ptr) { 1307 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; 1308 off = 3; /* Skip over "fc." */ 1309 goto check_len; 1310 } 1311 ptr = strstr(name, "iqn."); 1312 if (!ptr) { 1313 pr_err("Unable to locate prefix for emulated Target " 1314 "Port: %s\n", name); 1315 ret = -EINVAL; 1316 goto out; 1317 } 1318 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; 1319 1320check_len: 1321 if (strlen(name) >= TL_WWN_ADDR_LEN) { 1322 pr_err("Emulated NAA %s Address: %s, exceeds" 1323 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), 1324 TL_WWN_ADDR_LEN); 1325 ret = -EINVAL; 1326 goto out; 1327 } 1328 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); 1329 1330 /* 1331 * Call device_register(tl_hba->dev) to register the emulated 1332 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after 1333 * device_register() callbacks in tcm_loop_driver_probe() 1334 */ 1335 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); 1336 if (ret) 1337 goto out; 1338 1339 sh = tl_hba->sh; 1340 tcm_loop_hba_no_cnt++; 1341 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" 1342 " %s Address: %s at Linux/SCSI Host ID: %d\n", 1343 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); 1344 1345 return &tl_hba->tl_hba_wwn; 1346out: 1347 kfree(tl_hba); 1348 return ERR_PTR(ret); 1349} 1350 1351static void tcm_loop_drop_scsi_hba( 1352 struct se_wwn *wwn) 1353{ 1354 struct tcm_loop_hba *tl_hba = container_of(wwn, 1355 struct tcm_loop_hba, tl_hba_wwn); 1356 1357 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target" 1358 " SAS Address: %s at Linux/SCSI Host ID: %d\n", 1359 tl_hba->tl_wwn_address, tl_hba->sh->host_no); 1360 /* 1361 * Call device_unregister() on the original tl_hba->dev. 1362 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will 1363 * release *tl_hba; 1364 */ 1365 device_unregister(&tl_hba->dev); 1366} 1367 1368/* Start items for tcm_loop_cit */ 1369static ssize_t tcm_loop_wwn_show_attr_version( 1370 struct target_fabric_configfs *tf, 1371 char *page) 1372{ 1373 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); 1374} 1375 1376TF_WWN_ATTR_RO(tcm_loop, version); 1377 1378static struct configfs_attribute *tcm_loop_wwn_attrs[] = { 1379 &tcm_loop_wwn_version.attr, 1380 NULL, 1381}; 1382 1383/* End items for tcm_loop_cit */ 1384 1385static const struct target_core_fabric_ops loop_ops = { 1386 .module = THIS_MODULE, 1387 .name = "loopback", 1388 .get_fabric_name = tcm_loop_get_fabric_name, 1389 .get_fabric_proto_ident = tcm_loop_get_fabric_proto_ident, 1390 .tpg_get_wwn = tcm_loop_get_endpoint_wwn, 1391 .tpg_get_tag = tcm_loop_get_tag, 1392 .tpg_get_default_depth = tcm_loop_get_default_depth, 1393 .tpg_get_pr_transport_id = tcm_loop_get_pr_transport_id, 1394 .tpg_get_pr_transport_id_len = tcm_loop_get_pr_transport_id_len, 1395 .tpg_parse_pr_out_transport_id = tcm_loop_parse_pr_out_transport_id, 1396 .tpg_check_demo_mode = tcm_loop_check_demo_mode, 1397 .tpg_check_demo_mode_cache = tcm_loop_check_demo_mode_cache, 1398 .tpg_check_demo_mode_write_protect = 1399 tcm_loop_check_demo_mode_write_protect, 1400 .tpg_check_prod_mode_write_protect = 1401 tcm_loop_check_prod_mode_write_protect, 1402 .tpg_check_prot_fabric_only = tcm_loop_check_prot_fabric_only, 1403 .tpg_alloc_fabric_acl = tcm_loop_tpg_alloc_fabric_acl, 1404 .tpg_release_fabric_acl = tcm_loop_tpg_release_fabric_acl, 1405 .tpg_get_inst_index = tcm_loop_get_inst_index, 1406 .check_stop_free = tcm_loop_check_stop_free, 1407 .release_cmd = tcm_loop_release_cmd, 1408 .shutdown_session = tcm_loop_shutdown_session, 1409 .close_session = tcm_loop_close_session, 1410 .sess_get_index = tcm_loop_sess_get_index, 1411 .write_pending = tcm_loop_write_pending, 1412 .write_pending_status = tcm_loop_write_pending_status, 1413 .set_default_node_attributes = tcm_loop_set_default_node_attributes, 1414 .get_task_tag = tcm_loop_get_task_tag, 1415 .get_cmd_state = tcm_loop_get_cmd_state, 1416 .queue_data_in = tcm_loop_queue_data_in, 1417 .queue_status = tcm_loop_queue_status, 1418 .queue_tm_rsp = tcm_loop_queue_tm_rsp, 1419 .aborted_task = tcm_loop_aborted_task, 1420 .fabric_make_wwn = tcm_loop_make_scsi_hba, 1421 .fabric_drop_wwn = tcm_loop_drop_scsi_hba, 1422 .fabric_make_tpg = tcm_loop_make_naa_tpg, 1423 .fabric_drop_tpg = tcm_loop_drop_naa_tpg, 1424 .fabric_post_link = tcm_loop_port_link, 1425 .fabric_pre_unlink = tcm_loop_port_unlink, 1426 .tfc_wwn_attrs = tcm_loop_wwn_attrs, 1427 .tfc_tpg_base_attrs = tcm_loop_tpg_attrs, 1428 .tfc_tpg_attrib_attrs = tcm_loop_tpg_attrib_attrs, 1429}; 1430 1431static int __init tcm_loop_fabric_init(void) 1432{ 1433 int ret = -ENOMEM; 1434 1435 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0); 1436 if (!tcm_loop_workqueue) 1437 goto out; 1438 1439 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", 1440 sizeof(struct tcm_loop_cmd), 1441 __alignof__(struct tcm_loop_cmd), 1442 0, NULL); 1443 if (!tcm_loop_cmd_cache) { 1444 pr_debug("kmem_cache_create() for" 1445 " tcm_loop_cmd_cache failed\n"); 1446 goto out_destroy_workqueue; 1447 } 1448 1449 ret = tcm_loop_alloc_core_bus(); 1450 if (ret) 1451 goto out_destroy_cache; 1452 1453 ret = target_register_template(&loop_ops); 1454 if (ret) 1455 goto out_release_core_bus; 1456 1457 return 0; 1458 1459out_release_core_bus: 1460 tcm_loop_release_core_bus(); 1461out_destroy_cache: 1462 kmem_cache_destroy(tcm_loop_cmd_cache); 1463out_destroy_workqueue: 1464 destroy_workqueue(tcm_loop_workqueue); 1465out: 1466 return ret; 1467} 1468 1469static void __exit tcm_loop_fabric_exit(void) 1470{ 1471 target_unregister_template(&loop_ops); 1472 tcm_loop_release_core_bus(); 1473 kmem_cache_destroy(tcm_loop_cmd_cache); 1474 destroy_workqueue(tcm_loop_workqueue); 1475} 1476 1477MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); 1478MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>"); 1479MODULE_LICENSE("GPL"); 1480module_init(tcm_loop_fabric_init); 1481module_exit(tcm_loop_fabric_exit); 1482