1 /******************************************************************************* 2 * 3 * This file contains the Linux/SCSI LLD virtual SCSI initiator driver 4 * for emulated SAS initiator ports 5 * 6 * © Copyright 2011 RisingTide Systems LLC. 7 * 8 * Licensed to the Linux Foundation under the General Public License (GPL) version 2. 9 * 10 * Author: Nicholas A. Bellinger <nab@risingtidesystems.com> 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 ****************************************************************************/ 22 23 #include <linux/module.h> 24 #include <linux/moduleparam.h> 25 #include <linux/init.h> 26 #include <linux/slab.h> 27 #include <linux/types.h> 28 #include <linux/configfs.h> 29 #include <scsi/scsi.h> 30 #include <scsi/scsi_tcq.h> 31 #include <scsi/scsi_host.h> 32 #include <scsi/scsi_device.h> 33 #include <scsi/scsi_cmnd.h> 34 35 #include <target/target_core_base.h> 36 #include <target/target_core_fabric.h> 37 #include <target/target_core_fabric_configfs.h> 38 #include <target/target_core_configfs.h> 39 40 #include "tcm_loop.h" 41 42 #define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev) 43 44 /* Local pointer to allocated TCM configfs fabric module */ 45 static struct target_fabric_configfs *tcm_loop_fabric_configfs; 46 47 static struct kmem_cache *tcm_loop_cmd_cache; 48 49 static int tcm_loop_hba_no_cnt; 50 51 /* 52 * Allocate a tcm_loop cmd descriptor from target_core_mod code 53 * 54 * Can be called from interrupt context in tcm_loop_queuecommand() below 55 */ 56 static struct se_cmd *tcm_loop_allocate_core_cmd( 57 struct tcm_loop_hba *tl_hba, 58 struct se_portal_group *se_tpg, 59 struct scsi_cmnd *sc) 60 { 61 struct se_cmd *se_cmd; 62 struct se_session *se_sess; 63 struct tcm_loop_nexus *tl_nexus = tl_hba->tl_nexus; 64 struct tcm_loop_cmd *tl_cmd; 65 int sam_task_attr; 66 67 if (!tl_nexus) { 68 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus" 69 " does not exist\n"); 70 set_host_byte(sc, DID_ERROR); 71 return NULL; 72 } 73 se_sess = tl_nexus->se_sess; 74 75 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC); 76 if (!tl_cmd) { 77 pr_err("Unable to allocate struct tcm_loop_cmd\n"); 78 set_host_byte(sc, DID_ERROR); 79 return NULL; 80 } 81 se_cmd = &tl_cmd->tl_se_cmd; 82 /* 83 * Save the pointer to struct scsi_cmnd *sc 84 */ 85 tl_cmd->sc = sc; 86 /* 87 * Locate the SAM Task Attr from struct scsi_cmnd * 88 */ 89 if (sc->device->tagged_supported) { 90 switch (sc->tag) { 91 case HEAD_OF_QUEUE_TAG: 92 sam_task_attr = MSG_HEAD_TAG; 93 break; 94 case ORDERED_QUEUE_TAG: 95 sam_task_attr = MSG_ORDERED_TAG; 96 break; 97 default: 98 sam_task_attr = MSG_SIMPLE_TAG; 99 break; 100 } 101 } else 102 sam_task_attr = MSG_SIMPLE_TAG; 103 104 /* 105 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 106 */ 107 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 108 scsi_bufflen(sc), sc->sc_data_direction, sam_task_attr, 109 &tl_cmd->tl_sense_buf[0]); 110 111 if (scsi_bidi_cmnd(sc)) 112 se_cmd->se_cmd_flags |= SCF_BIDI; 113 114 /* 115 * Locate the struct se_lun pointer and attach it to struct se_cmd 116 */ 117 if (transport_lookup_cmd_lun(se_cmd, tl_cmd->sc->device->lun) < 0) { 118 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); 119 set_host_byte(sc, DID_NO_CONNECT); 120 return NULL; 121 } 122 123 return se_cmd; 124 } 125 126 /* 127 * Called by struct target_core_fabric_ops->new_cmd_map() 128 * 129 * Always called in process context. A non zero return value 130 * here will signal to handle an exception based on the return code. 131 */ 132 static int tcm_loop_new_cmd_map(struct se_cmd *se_cmd) 133 { 134 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 135 struct tcm_loop_cmd, tl_se_cmd); 136 struct scsi_cmnd *sc = tl_cmd->sc; 137 struct scatterlist *sgl_bidi = NULL; 138 u32 sgl_bidi_count = 0; 139 int ret; 140 /* 141 * Allocate the necessary tasks to complete the received CDB+data 142 */ 143 ret = transport_generic_allocate_tasks(se_cmd, sc->cmnd); 144 if (ret != 0) 145 return ret; 146 /* 147 * For BIDI commands, pass in the extra READ buffer 148 * to transport_generic_map_mem_to_cmd() below.. 149 */ 150 if (se_cmd->se_cmd_flags & SCF_BIDI) { 151 struct scsi_data_buffer *sdb = scsi_in(sc); 152 153 sgl_bidi = sdb->table.sgl; 154 sgl_bidi_count = sdb->table.nents; 155 } 156 /* 157 * Because some userspace code via scsi-generic do not memset their 158 * associated read buffers, go ahead and do that here for type 159 * SCF_SCSI_CONTROL_SG_IO_CDB. Also note that this is currently 160 * guaranteed to be a single SGL for SCF_SCSI_CONTROL_SG_IO_CDB 161 * by target core in transport_generic_allocate_tasks() -> 162 * transport_generic_cmd_sequencer(). 163 */ 164 if (se_cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB && 165 se_cmd->data_direction == DMA_FROM_DEVICE) { 166 struct scatterlist *sg = scsi_sglist(sc); 167 unsigned char *buf = kmap(sg_page(sg)) + sg->offset; 168 169 if (buf != NULL) { 170 memset(buf, 0, sg->length); 171 kunmap(sg_page(sg)); 172 } 173 } 174 175 /* Tell the core about our preallocated memory */ 176 return transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc), 177 scsi_sg_count(sc), sgl_bidi, sgl_bidi_count); 178 } 179 180 /* 181 * Called from struct target_core_fabric_ops->check_stop_free() 182 */ 183 static int tcm_loop_check_stop_free(struct se_cmd *se_cmd) 184 { 185 /* 186 * Do not release struct se_cmd's containing a valid TMR 187 * pointer. These will be released directly in tcm_loop_device_reset() 188 * with transport_generic_free_cmd(). 189 */ 190 if (se_cmd->se_tmr_req) 191 return 0; 192 /* 193 * Release the struct se_cmd, which will make a callback to release 194 * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd() 195 */ 196 transport_generic_free_cmd(se_cmd, 0); 197 return 1; 198 } 199 200 static void tcm_loop_release_cmd(struct se_cmd *se_cmd) 201 { 202 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 203 struct tcm_loop_cmd, tl_se_cmd); 204 205 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); 206 } 207 208 static int tcm_loop_proc_info(struct Scsi_Host *host, char *buffer, 209 char **start, off_t offset, 210 int length, int inout) 211 { 212 return sprintf(buffer, "tcm_loop_proc_info()\n"); 213 } 214 215 static int tcm_loop_driver_probe(struct device *); 216 static int tcm_loop_driver_remove(struct device *); 217 218 static int pseudo_lld_bus_match(struct device *dev, 219 struct device_driver *dev_driver) 220 { 221 return 1; 222 } 223 224 static struct bus_type tcm_loop_lld_bus = { 225 .name = "tcm_loop_bus", 226 .match = pseudo_lld_bus_match, 227 .probe = tcm_loop_driver_probe, 228 .remove = tcm_loop_driver_remove, 229 }; 230 231 static struct device_driver tcm_loop_driverfs = { 232 .name = "tcm_loop", 233 .bus = &tcm_loop_lld_bus, 234 }; 235 /* 236 * Used with root_device_register() in tcm_loop_alloc_core_bus() below 237 */ 238 struct device *tcm_loop_primary; 239 240 /* 241 * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and 242 * drivers/scsi/libiscsi.c:iscsi_change_queue_depth() 243 */ 244 static int tcm_loop_change_queue_depth( 245 struct scsi_device *sdev, 246 int depth, 247 int reason) 248 { 249 switch (reason) { 250 case SCSI_QDEPTH_DEFAULT: 251 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 252 break; 253 case SCSI_QDEPTH_QFULL: 254 scsi_track_queue_full(sdev, depth); 255 break; 256 case SCSI_QDEPTH_RAMP_UP: 257 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); 258 break; 259 default: 260 return -EOPNOTSUPP; 261 } 262 return sdev->queue_depth; 263 } 264 265 /* 266 * Main entry point from struct scsi_host_template for incoming SCSI CDB+Data 267 * from Linux/SCSI subsystem for SCSI low level device drivers (LLDs) 268 */ 269 static int tcm_loop_queuecommand( 270 struct Scsi_Host *sh, 271 struct scsi_cmnd *sc) 272 { 273 struct se_cmd *se_cmd; 274 struct se_portal_group *se_tpg; 275 struct tcm_loop_hba *tl_hba; 276 struct tcm_loop_tpg *tl_tpg; 277 278 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x" 279 " scsi_buf_len: %u\n", sc->device->host->host_no, 280 sc->device->id, sc->device->channel, sc->device->lun, 281 sc->cmnd[0], scsi_bufflen(sc)); 282 /* 283 * Locate the tcm_loop_hba_t pointer 284 */ 285 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 286 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 287 /* 288 * Ensure that this tl_tpg reference from the incoming sc->device->id 289 * has already been configured via tcm_loop_make_naa_tpg(). 290 */ 291 if (!tl_tpg->tl_hba) { 292 set_host_byte(sc, DID_NO_CONNECT); 293 sc->scsi_done(sc); 294 return 0; 295 } 296 se_tpg = &tl_tpg->tl_se_tpg; 297 /* 298 * Determine the SAM Task Attribute and allocate tl_cmd and 299 * tl_cmd->tl_se_cmd from TCM infrastructure 300 */ 301 se_cmd = tcm_loop_allocate_core_cmd(tl_hba, se_tpg, sc); 302 if (!se_cmd) { 303 sc->scsi_done(sc); 304 return 0; 305 } 306 /* 307 * Queue up the newly allocated to be processed in TCM thread context. 308 */ 309 transport_generic_handle_cdb_map(se_cmd); 310 return 0; 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 se_cmd *se_cmd = NULL; 320 struct se_portal_group *se_tpg; 321 struct se_session *se_sess; 322 struct tcm_loop_cmd *tl_cmd = NULL; 323 struct tcm_loop_hba *tl_hba; 324 struct tcm_loop_nexus *tl_nexus; 325 struct tcm_loop_tmr *tl_tmr = NULL; 326 struct tcm_loop_tpg *tl_tpg; 327 int ret = FAILED; 328 /* 329 * Locate the tcm_loop_hba_t pointer 330 */ 331 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); 332 /* 333 * Locate the tl_nexus and se_sess pointers 334 */ 335 tl_nexus = tl_hba->tl_nexus; 336 if (!tl_nexus) { 337 pr_err("Unable to perform device reset without" 338 " active I_T Nexus\n"); 339 return FAILED; 340 } 341 se_sess = tl_nexus->se_sess; 342 /* 343 * Locate the tl_tpg and se_tpg pointers from TargetID in sc->device->id 344 */ 345 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; 346 se_tpg = &tl_tpg->tl_se_tpg; 347 348 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); 349 if (!tl_cmd) { 350 pr_err("Unable to allocate memory for tl_cmd\n"); 351 return FAILED; 352 } 353 354 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL); 355 if (!tl_tmr) { 356 pr_err("Unable to allocate memory for tl_tmr\n"); 357 goto release; 358 } 359 init_waitqueue_head(&tl_tmr->tl_tmr_wait); 360 361 se_cmd = &tl_cmd->tl_se_cmd; 362 /* 363 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 364 */ 365 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0, 366 DMA_NONE, MSG_SIMPLE_TAG, 367 &tl_cmd->tl_sense_buf[0]); 368 /* 369 * Allocate the LUN_RESET TMR 370 */ 371 se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd, tl_tmr, 372 TMR_LUN_RESET, GFP_KERNEL); 373 if (IS_ERR(se_cmd->se_tmr_req)) 374 goto release; 375 /* 376 * Locate the underlying TCM struct se_lun from sc->device->lun 377 */ 378 if (transport_lookup_tmr_lun(se_cmd, sc->device->lun) < 0) 379 goto release; 380 /* 381 * Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp() 382 * to wake us up. 383 */ 384 transport_generic_handle_tmr(se_cmd); 385 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete)); 386 /* 387 * The TMR LUN_RESET has completed, check the response status and 388 * then release allocations. 389 */ 390 ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? 391 SUCCESS : FAILED; 392 release: 393 if (se_cmd) 394 transport_generic_free_cmd(se_cmd, 1); 395 else 396 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); 397 kfree(tl_tmr); 398 return ret; 399 } 400 401 static int tcm_loop_slave_alloc(struct scsi_device *sd) 402 { 403 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags); 404 return 0; 405 } 406 407 static int tcm_loop_slave_configure(struct scsi_device *sd) 408 { 409 return 0; 410 } 411 412 static struct scsi_host_template tcm_loop_driver_template = { 413 .proc_info = tcm_loop_proc_info, 414 .proc_name = "tcm_loopback", 415 .name = "TCM_Loopback", 416 .queuecommand = tcm_loop_queuecommand, 417 .change_queue_depth = tcm_loop_change_queue_depth, 418 .eh_device_reset_handler = tcm_loop_device_reset, 419 .can_queue = 1024, 420 .this_id = -1, 421 .sg_tablesize = 256, 422 .cmd_per_lun = 1024, 423 .max_sectors = 0xFFFF, 424 .use_clustering = DISABLE_CLUSTERING, 425 .slave_alloc = tcm_loop_slave_alloc, 426 .slave_configure = tcm_loop_slave_configure, 427 .module = THIS_MODULE, 428 }; 429 430 static int tcm_loop_driver_probe(struct device *dev) 431 { 432 struct tcm_loop_hba *tl_hba; 433 struct Scsi_Host *sh; 434 int error; 435 436 tl_hba = to_tcm_loop_hba(dev); 437 438 sh = scsi_host_alloc(&tcm_loop_driver_template, 439 sizeof(struct tcm_loop_hba)); 440 if (!sh) { 441 pr_err("Unable to allocate struct scsi_host\n"); 442 return -ENODEV; 443 } 444 tl_hba->sh = sh; 445 446 /* 447 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata 448 */ 449 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba; 450 /* 451 * Setup single ID, Channel and LUN for now.. 452 */ 453 sh->max_id = 2; 454 sh->max_lun = 0; 455 sh->max_channel = 0; 456 sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN; 457 458 error = scsi_add_host(sh, &tl_hba->dev); 459 if (error) { 460 pr_err("%s: scsi_add_host failed\n", __func__); 461 scsi_host_put(sh); 462 return -ENODEV; 463 } 464 return 0; 465 } 466 467 static int tcm_loop_driver_remove(struct device *dev) 468 { 469 struct tcm_loop_hba *tl_hba; 470 struct Scsi_Host *sh; 471 472 tl_hba = to_tcm_loop_hba(dev); 473 sh = tl_hba->sh; 474 475 scsi_remove_host(sh); 476 scsi_host_put(sh); 477 return 0; 478 } 479 480 static void tcm_loop_release_adapter(struct device *dev) 481 { 482 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev); 483 484 kfree(tl_hba); 485 } 486 487 /* 488 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c 489 */ 490 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id) 491 { 492 int ret; 493 494 tl_hba->dev.bus = &tcm_loop_lld_bus; 495 tl_hba->dev.parent = tcm_loop_primary; 496 tl_hba->dev.release = &tcm_loop_release_adapter; 497 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id); 498 499 ret = device_register(&tl_hba->dev); 500 if (ret) { 501 pr_err("device_register() failed for" 502 " tl_hba->dev: %d\n", ret); 503 return -ENODEV; 504 } 505 506 return 0; 507 } 508 509 /* 510 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated 511 * tcm_loop SCSI bus. 512 */ 513 static int tcm_loop_alloc_core_bus(void) 514 { 515 int ret; 516 517 tcm_loop_primary = root_device_register("tcm_loop_0"); 518 if (IS_ERR(tcm_loop_primary)) { 519 pr_err("Unable to allocate tcm_loop_primary\n"); 520 return PTR_ERR(tcm_loop_primary); 521 } 522 523 ret = bus_register(&tcm_loop_lld_bus); 524 if (ret) { 525 pr_err("bus_register() failed for tcm_loop_lld_bus\n"); 526 goto dev_unreg; 527 } 528 529 ret = driver_register(&tcm_loop_driverfs); 530 if (ret) { 531 pr_err("driver_register() failed for" 532 "tcm_loop_driverfs\n"); 533 goto bus_unreg; 534 } 535 536 pr_debug("Initialized TCM Loop Core Bus\n"); 537 return ret; 538 539 bus_unreg: 540 bus_unregister(&tcm_loop_lld_bus); 541 dev_unreg: 542 root_device_unregister(tcm_loop_primary); 543 return ret; 544 } 545 546 static void tcm_loop_release_core_bus(void) 547 { 548 driver_unregister(&tcm_loop_driverfs); 549 bus_unregister(&tcm_loop_lld_bus); 550 root_device_unregister(tcm_loop_primary); 551 552 pr_debug("Releasing TCM Loop Core BUS\n"); 553 } 554 555 static char *tcm_loop_get_fabric_name(void) 556 { 557 return "loopback"; 558 } 559 560 static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg) 561 { 562 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 563 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 564 /* 565 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba() 566 * time based on the protocol dependent prefix of the passed configfs group. 567 * 568 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric 569 * ProtocolID using target_core_fabric_lib.c symbols. 570 */ 571 switch (tl_hba->tl_proto_id) { 572 case SCSI_PROTOCOL_SAS: 573 return sas_get_fabric_proto_ident(se_tpg); 574 case SCSI_PROTOCOL_FCP: 575 return fc_get_fabric_proto_ident(se_tpg); 576 case SCSI_PROTOCOL_ISCSI: 577 return iscsi_get_fabric_proto_ident(se_tpg); 578 default: 579 pr_err("Unknown tl_proto_id: 0x%02x, using" 580 " SAS emulation\n", tl_hba->tl_proto_id); 581 break; 582 } 583 584 return sas_get_fabric_proto_ident(se_tpg); 585 } 586 587 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg) 588 { 589 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 590 /* 591 * Return the passed NAA identifier for the SAS Target Port 592 */ 593 return &tl_tpg->tl_hba->tl_wwn_address[0]; 594 } 595 596 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg) 597 { 598 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 599 /* 600 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 601 * to represent the SCSI Target Port. 602 */ 603 return tl_tpg->tl_tpgt; 604 } 605 606 static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg) 607 { 608 return 1; 609 } 610 611 static u32 tcm_loop_get_pr_transport_id( 612 struct se_portal_group *se_tpg, 613 struct se_node_acl *se_nacl, 614 struct t10_pr_registration *pr_reg, 615 int *format_code, 616 unsigned char *buf) 617 { 618 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 619 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 620 621 switch (tl_hba->tl_proto_id) { 622 case SCSI_PROTOCOL_SAS: 623 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 624 format_code, buf); 625 case SCSI_PROTOCOL_FCP: 626 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 627 format_code, buf); 628 case SCSI_PROTOCOL_ISCSI: 629 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 630 format_code, buf); 631 default: 632 pr_err("Unknown tl_proto_id: 0x%02x, using" 633 " SAS emulation\n", tl_hba->tl_proto_id); 634 break; 635 } 636 637 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 638 format_code, buf); 639 } 640 641 static u32 tcm_loop_get_pr_transport_id_len( 642 struct se_portal_group *se_tpg, 643 struct se_node_acl *se_nacl, 644 struct t10_pr_registration *pr_reg, 645 int *format_code) 646 { 647 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 648 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 649 650 switch (tl_hba->tl_proto_id) { 651 case SCSI_PROTOCOL_SAS: 652 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 653 format_code); 654 case SCSI_PROTOCOL_FCP: 655 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 656 format_code); 657 case SCSI_PROTOCOL_ISCSI: 658 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 659 format_code); 660 default: 661 pr_err("Unknown tl_proto_id: 0x%02x, using" 662 " SAS emulation\n", tl_hba->tl_proto_id); 663 break; 664 } 665 666 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 667 format_code); 668 } 669 670 /* 671 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above 672 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. 673 */ 674 static char *tcm_loop_parse_pr_out_transport_id( 675 struct se_portal_group *se_tpg, 676 const char *buf, 677 u32 *out_tid_len, 678 char **port_nexus_ptr) 679 { 680 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; 681 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 682 683 switch (tl_hba->tl_proto_id) { 684 case SCSI_PROTOCOL_SAS: 685 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 686 port_nexus_ptr); 687 case SCSI_PROTOCOL_FCP: 688 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 689 port_nexus_ptr); 690 case SCSI_PROTOCOL_ISCSI: 691 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 692 port_nexus_ptr); 693 default: 694 pr_err("Unknown tl_proto_id: 0x%02x, using" 695 " SAS emulation\n", tl_hba->tl_proto_id); 696 break; 697 } 698 699 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 700 port_nexus_ptr); 701 } 702 703 /* 704 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated 705 * based upon the incoming fabric dependent SCSI Initiator Port 706 */ 707 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) 708 { 709 return 1; 710 } 711 712 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) 713 { 714 return 0; 715 } 716 717 /* 718 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for 719 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest 720 */ 721 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) 722 { 723 return 0; 724 } 725 726 /* 727 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will 728 * never be called for TCM_Loop by target_core_fabric_configfs.c code. 729 * It has been added here as a nop for target_fabric_tf_ops_check() 730 */ 731 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) 732 { 733 return 0; 734 } 735 736 static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl( 737 struct se_portal_group *se_tpg) 738 { 739 struct tcm_loop_nacl *tl_nacl; 740 741 tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL); 742 if (!tl_nacl) { 743 pr_err("Unable to allocate struct tcm_loop_nacl\n"); 744 return NULL; 745 } 746 747 return &tl_nacl->se_node_acl; 748 } 749 750 static void tcm_loop_tpg_release_fabric_acl( 751 struct se_portal_group *se_tpg, 752 struct se_node_acl *se_nacl) 753 { 754 struct tcm_loop_nacl *tl_nacl = container_of(se_nacl, 755 struct tcm_loop_nacl, se_node_acl); 756 757 kfree(tl_nacl); 758 } 759 760 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) 761 { 762 return 1; 763 } 764 765 static int tcm_loop_is_state_remove(struct se_cmd *se_cmd) 766 { 767 /* 768 * Assume struct scsi_cmnd is not in remove state.. 769 */ 770 return 0; 771 } 772 773 static int tcm_loop_sess_logged_in(struct se_session *se_sess) 774 { 775 /* 776 * Assume that TL Nexus is always active 777 */ 778 return 1; 779 } 780 781 static u32 tcm_loop_sess_get_index(struct se_session *se_sess) 782 { 783 return 1; 784 } 785 786 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) 787 { 788 return; 789 } 790 791 static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd) 792 { 793 return 1; 794 } 795 796 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) 797 { 798 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 799 struct tcm_loop_cmd, tl_se_cmd); 800 801 return tl_cmd->sc_cmd_state; 802 } 803 804 static int tcm_loop_shutdown_session(struct se_session *se_sess) 805 { 806 return 0; 807 } 808 809 static void tcm_loop_close_session(struct se_session *se_sess) 810 { 811 return; 812 }; 813 814 static void tcm_loop_stop_session( 815 struct se_session *se_sess, 816 int sess_sleep, 817 int conn_sleep) 818 { 819 return; 820 } 821 822 static void tcm_loop_fall_back_to_erl0(struct se_session *se_sess) 823 { 824 return; 825 } 826 827 static int tcm_loop_write_pending(struct se_cmd *se_cmd) 828 { 829 /* 830 * Since Linux/SCSI has already sent down a struct scsi_cmnd 831 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array 832 * memory, and memory has already been mapped to struct se_cmd->t_mem_list 833 * format with transport_generic_map_mem_to_cmd(). 834 * 835 * We now tell TCM to add this WRITE CDB directly into the TCM storage 836 * object execution queue. 837 */ 838 transport_generic_process_write(se_cmd); 839 return 0; 840 } 841 842 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) 843 { 844 return 0; 845 } 846 847 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) 848 { 849 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 850 struct tcm_loop_cmd, tl_se_cmd); 851 struct scsi_cmnd *sc = tl_cmd->sc; 852 853 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" 854 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 855 856 sc->result = SAM_STAT_GOOD; 857 set_host_byte(sc, DID_OK); 858 sc->scsi_done(sc); 859 return 0; 860 } 861 862 static int tcm_loop_queue_status(struct se_cmd *se_cmd) 863 { 864 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, 865 struct tcm_loop_cmd, tl_se_cmd); 866 struct scsi_cmnd *sc = tl_cmd->sc; 867 868 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" 869 " cdb: 0x%02x\n", sc, sc->cmnd[0]); 870 871 if (se_cmd->sense_buffer && 872 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 873 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { 874 875 memcpy(sc->sense_buffer, se_cmd->sense_buffer, 876 SCSI_SENSE_BUFFERSIZE); 877 sc->result = SAM_STAT_CHECK_CONDITION; 878 set_driver_byte(sc, DRIVER_SENSE); 879 } else 880 sc->result = se_cmd->scsi_status; 881 882 set_host_byte(sc, DID_OK); 883 sc->scsi_done(sc); 884 return 0; 885 } 886 887 static int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) 888 { 889 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; 890 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; 891 /* 892 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead 893 * and wake up the wait_queue_head_t in tcm_loop_device_reset() 894 */ 895 atomic_set(&tl_tmr->tmr_complete, 1); 896 wake_up(&tl_tmr->tl_tmr_wait); 897 return 0; 898 } 899 900 static u16 tcm_loop_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length) 901 { 902 return 0; 903 } 904 905 static u16 tcm_loop_get_fabric_sense_len(void) 906 { 907 return 0; 908 } 909 910 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) 911 { 912 switch (tl_hba->tl_proto_id) { 913 case SCSI_PROTOCOL_SAS: 914 return "SAS"; 915 case SCSI_PROTOCOL_FCP: 916 return "FCP"; 917 case SCSI_PROTOCOL_ISCSI: 918 return "iSCSI"; 919 default: 920 break; 921 } 922 923 return "Unknown"; 924 } 925 926 /* Start items for tcm_loop_port_cit */ 927 928 static int tcm_loop_port_link( 929 struct se_portal_group *se_tpg, 930 struct se_lun *lun) 931 { 932 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 933 struct tcm_loop_tpg, tl_se_tpg); 934 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 935 936 atomic_inc(&tl_tpg->tl_tpg_port_count); 937 smp_mb__after_atomic_inc(); 938 /* 939 * Add Linux/SCSI struct scsi_device by HCTL 940 */ 941 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); 942 943 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); 944 return 0; 945 } 946 947 static void tcm_loop_port_unlink( 948 struct se_portal_group *se_tpg, 949 struct se_lun *se_lun) 950 { 951 struct scsi_device *sd; 952 struct tcm_loop_hba *tl_hba; 953 struct tcm_loop_tpg *tl_tpg; 954 955 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); 956 tl_hba = tl_tpg->tl_hba; 957 958 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, 959 se_lun->unpacked_lun); 960 if (!sd) { 961 pr_err("Unable to locate struct scsi_device for %d:%d:" 962 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); 963 return; 964 } 965 /* 966 * Remove Linux/SCSI struct scsi_device by HCTL 967 */ 968 scsi_remove_device(sd); 969 scsi_device_put(sd); 970 971 atomic_dec(&tl_tpg->tl_tpg_port_count); 972 smp_mb__after_atomic_dec(); 973 974 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); 975 } 976 977 /* End items for tcm_loop_port_cit */ 978 979 /* Start items for tcm_loop_nexus_cit */ 980 981 static int tcm_loop_make_nexus( 982 struct tcm_loop_tpg *tl_tpg, 983 const char *name) 984 { 985 struct se_portal_group *se_tpg; 986 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 987 struct tcm_loop_nexus *tl_nexus; 988 int ret = -ENOMEM; 989 990 if (tl_tpg->tl_hba->tl_nexus) { 991 pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n"); 992 return -EEXIST; 993 } 994 se_tpg = &tl_tpg->tl_se_tpg; 995 996 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); 997 if (!tl_nexus) { 998 pr_err("Unable to allocate struct tcm_loop_nexus\n"); 999 return -ENOMEM; 1000 } 1001 /* 1002 * Initialize the struct se_session pointer 1003 */ 1004 tl_nexus->se_sess = transport_init_session(); 1005 if (IS_ERR(tl_nexus->se_sess)) { 1006 ret = PTR_ERR(tl_nexus->se_sess); 1007 goto out; 1008 } 1009 /* 1010 * Since we are running in 'demo mode' this call with generate a 1011 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI 1012 * Initiator port name of the passed configfs group 'name'. 1013 */ 1014 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1015 se_tpg, (unsigned char *)name); 1016 if (!tl_nexus->se_sess->se_node_acl) { 1017 transport_free_session(tl_nexus->se_sess); 1018 goto out; 1019 } 1020 /* 1021 * Now, register the SAS I_T Nexus as active with the call to 1022 * transport_register_session() 1023 */ 1024 __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, 1025 tl_nexus->se_sess, tl_nexus); 1026 tl_tpg->tl_hba->tl_nexus = tl_nexus; 1027 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" 1028 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), 1029 name); 1030 return 0; 1031 1032 out: 1033 kfree(tl_nexus); 1034 return ret; 1035 } 1036 1037 static int tcm_loop_drop_nexus( 1038 struct tcm_loop_tpg *tpg) 1039 { 1040 struct se_session *se_sess; 1041 struct tcm_loop_nexus *tl_nexus; 1042 struct tcm_loop_hba *tl_hba = tpg->tl_hba; 1043 1044 tl_nexus = tpg->tl_hba->tl_nexus; 1045 if (!tl_nexus) 1046 return -ENODEV; 1047 1048 se_sess = tl_nexus->se_sess; 1049 if (!se_sess) 1050 return -ENODEV; 1051 1052 if (atomic_read(&tpg->tl_tpg_port_count)) { 1053 pr_err("Unable to remove TCM_Loop I_T Nexus with" 1054 " active TPG port count: %d\n", 1055 atomic_read(&tpg->tl_tpg_port_count)); 1056 return -EPERM; 1057 } 1058 1059 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" 1060 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), 1061 tl_nexus->se_sess->se_node_acl->initiatorname); 1062 /* 1063 * Release the SCSI I_T Nexus to the emulated SAS Target Port 1064 */ 1065 transport_deregister_session(tl_nexus->se_sess); 1066 tpg->tl_hba->tl_nexus = NULL; 1067 kfree(tl_nexus); 1068 return 0; 1069 } 1070 1071 /* End items for tcm_loop_nexus_cit */ 1072 1073 static ssize_t tcm_loop_tpg_show_nexus( 1074 struct se_portal_group *se_tpg, 1075 char *page) 1076 { 1077 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1078 struct tcm_loop_tpg, tl_se_tpg); 1079 struct tcm_loop_nexus *tl_nexus; 1080 ssize_t ret; 1081 1082 tl_nexus = tl_tpg->tl_hba->tl_nexus; 1083 if (!tl_nexus) 1084 return -ENODEV; 1085 1086 ret = snprintf(page, PAGE_SIZE, "%s\n", 1087 tl_nexus->se_sess->se_node_acl->initiatorname); 1088 1089 return ret; 1090 } 1091 1092 static ssize_t tcm_loop_tpg_store_nexus( 1093 struct se_portal_group *se_tpg, 1094 const char *page, 1095 size_t count) 1096 { 1097 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1098 struct tcm_loop_tpg, tl_se_tpg); 1099 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; 1100 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; 1101 int ret; 1102 /* 1103 * Shutdown the active I_T nexus if 'NULL' is passed.. 1104 */ 1105 if (!strncmp(page, "NULL", 4)) { 1106 ret = tcm_loop_drop_nexus(tl_tpg); 1107 return (!ret) ? count : ret; 1108 } 1109 /* 1110 * Otherwise make sure the passed virtual Initiator port WWN matches 1111 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call 1112 * tcm_loop_make_nexus() 1113 */ 1114 if (strlen(page) >= TL_WWN_ADDR_LEN) { 1115 pr_err("Emulated NAA Sas Address: %s, exceeds" 1116 " max: %d\n", page, TL_WWN_ADDR_LEN); 1117 return -EINVAL; 1118 } 1119 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); 1120 1121 ptr = strstr(i_port, "naa."); 1122 if (ptr) { 1123 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { 1124 pr_err("Passed SAS Initiator Port %s does not" 1125 " match target port protoid: %s\n", i_port, 1126 tcm_loop_dump_proto_id(tl_hba)); 1127 return -EINVAL; 1128 } 1129 port_ptr = &i_port[0]; 1130 goto check_newline; 1131 } 1132 ptr = strstr(i_port, "fc."); 1133 if (ptr) { 1134 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { 1135 pr_err("Passed FCP Initiator Port %s does not" 1136 " match target port protoid: %s\n", i_port, 1137 tcm_loop_dump_proto_id(tl_hba)); 1138 return -EINVAL; 1139 } 1140 port_ptr = &i_port[3]; /* Skip over "fc." */ 1141 goto check_newline; 1142 } 1143 ptr = strstr(i_port, "iqn."); 1144 if (ptr) { 1145 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { 1146 pr_err("Passed iSCSI Initiator Port %s does not" 1147 " match target port protoid: %s\n", i_port, 1148 tcm_loop_dump_proto_id(tl_hba)); 1149 return -EINVAL; 1150 } 1151 port_ptr = &i_port[0]; 1152 goto check_newline; 1153 } 1154 pr_err("Unable to locate prefix for emulated Initiator Port:" 1155 " %s\n", i_port); 1156 return -EINVAL; 1157 /* 1158 * Clear any trailing newline for the NAA WWN 1159 */ 1160 check_newline: 1161 if (i_port[strlen(i_port)-1] == '\n') 1162 i_port[strlen(i_port)-1] = '\0'; 1163 1164 ret = tcm_loop_make_nexus(tl_tpg, port_ptr); 1165 if (ret < 0) 1166 return ret; 1167 1168 return count; 1169 } 1170 1171 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); 1172 1173 static struct configfs_attribute *tcm_loop_tpg_attrs[] = { 1174 &tcm_loop_tpg_nexus.attr, 1175 NULL, 1176 }; 1177 1178 /* Start items for tcm_loop_naa_cit */ 1179 1180 struct se_portal_group *tcm_loop_make_naa_tpg( 1181 struct se_wwn *wwn, 1182 struct config_group *group, 1183 const char *name) 1184 { 1185 struct tcm_loop_hba *tl_hba = container_of(wwn, 1186 struct tcm_loop_hba, tl_hba_wwn); 1187 struct tcm_loop_tpg *tl_tpg; 1188 char *tpgt_str, *end_ptr; 1189 int ret; 1190 unsigned short int tpgt; 1191 1192 tpgt_str = strstr(name, "tpgt_"); 1193 if (!tpgt_str) { 1194 pr_err("Unable to locate \"tpgt_#\" directory" 1195 " group\n"); 1196 return ERR_PTR(-EINVAL); 1197 } 1198 tpgt_str += 5; /* Skip ahead of "tpgt_" */ 1199 tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0); 1200 1201 if (tpgt >= TL_TPGS_PER_HBA) { 1202 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:" 1203 " %u\n", tpgt, TL_TPGS_PER_HBA); 1204 return ERR_PTR(-EINVAL); 1205 } 1206 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; 1207 tl_tpg->tl_hba = tl_hba; 1208 tl_tpg->tl_tpgt = tpgt; 1209 /* 1210 * Register the tl_tpg as a emulated SAS TCM Target Endpoint 1211 */ 1212 ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops, 1213 wwn, &tl_tpg->tl_se_tpg, tl_tpg, 1214 TRANSPORT_TPG_TYPE_NORMAL); 1215 if (ret < 0) 1216 return ERR_PTR(-ENOMEM); 1217 1218 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" 1219 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), 1220 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1221 1222 return &tl_tpg->tl_se_tpg; 1223 } 1224 1225 void tcm_loop_drop_naa_tpg( 1226 struct se_portal_group *se_tpg) 1227 { 1228 struct se_wwn *wwn = se_tpg->se_tpg_wwn; 1229 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, 1230 struct tcm_loop_tpg, tl_se_tpg); 1231 struct tcm_loop_hba *tl_hba; 1232 unsigned short tpgt; 1233 1234 tl_hba = tl_tpg->tl_hba; 1235 tpgt = tl_tpg->tl_tpgt; 1236 /* 1237 * Release the I_T Nexus for the Virtual SAS link if present 1238 */ 1239 tcm_loop_drop_nexus(tl_tpg); 1240 /* 1241 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint 1242 */ 1243 core_tpg_deregister(se_tpg); 1244 1245 tl_tpg->tl_hba = NULL; 1246 tl_tpg->tl_tpgt = 0; 1247 1248 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" 1249 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), 1250 config_item_name(&wwn->wwn_group.cg_item), tpgt); 1251 } 1252 1253 /* End items for tcm_loop_naa_cit */ 1254 1255 /* Start items for tcm_loop_cit */ 1256 1257 struct se_wwn *tcm_loop_make_scsi_hba( 1258 struct target_fabric_configfs *tf, 1259 struct config_group *group, 1260 const char *name) 1261 { 1262 struct tcm_loop_hba *tl_hba; 1263 struct Scsi_Host *sh; 1264 char *ptr; 1265 int ret, off = 0; 1266 1267 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); 1268 if (!tl_hba) { 1269 pr_err("Unable to allocate struct tcm_loop_hba\n"); 1270 return ERR_PTR(-ENOMEM); 1271 } 1272 /* 1273 * Determine the emulated Protocol Identifier and Target Port Name 1274 * based on the incoming configfs directory name. 1275 */ 1276 ptr = strstr(name, "naa."); 1277 if (ptr) { 1278 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; 1279 goto check_len; 1280 } 1281 ptr = strstr(name, "fc."); 1282 if (ptr) { 1283 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; 1284 off = 3; /* Skip over "fc." */ 1285 goto check_len; 1286 } 1287 ptr = strstr(name, "iqn."); 1288 if (!ptr) { 1289 pr_err("Unable to locate prefix for emulated Target " 1290 "Port: %s\n", name); 1291 ret = -EINVAL; 1292 goto out; 1293 } 1294 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; 1295 1296 check_len: 1297 if (strlen(name) >= TL_WWN_ADDR_LEN) { 1298 pr_err("Emulated NAA %s Address: %s, exceeds" 1299 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), 1300 TL_WWN_ADDR_LEN); 1301 ret = -EINVAL; 1302 goto out; 1303 } 1304 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); 1305 1306 /* 1307 * Call device_register(tl_hba->dev) to register the emulated 1308 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after 1309 * device_register() callbacks in tcm_loop_driver_probe() 1310 */ 1311 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); 1312 if (ret) 1313 goto out; 1314 1315 sh = tl_hba->sh; 1316 tcm_loop_hba_no_cnt++; 1317 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" 1318 " %s Address: %s at Linux/SCSI Host ID: %d\n", 1319 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); 1320 1321 return &tl_hba->tl_hba_wwn; 1322 out: 1323 kfree(tl_hba); 1324 return ERR_PTR(ret); 1325 } 1326 1327 void tcm_loop_drop_scsi_hba( 1328 struct se_wwn *wwn) 1329 { 1330 struct tcm_loop_hba *tl_hba = container_of(wwn, 1331 struct tcm_loop_hba, tl_hba_wwn); 1332 1333 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target" 1334 " SAS Address: %s at Linux/SCSI Host ID: %d\n", 1335 tl_hba->tl_wwn_address, tl_hba->sh->host_no); 1336 /* 1337 * Call device_unregister() on the original tl_hba->dev. 1338 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will 1339 * release *tl_hba; 1340 */ 1341 device_unregister(&tl_hba->dev); 1342 } 1343 1344 /* Start items for tcm_loop_cit */ 1345 static ssize_t tcm_loop_wwn_show_attr_version( 1346 struct target_fabric_configfs *tf, 1347 char *page) 1348 { 1349 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); 1350 } 1351 1352 TF_WWN_ATTR_RO(tcm_loop, version); 1353 1354 static struct configfs_attribute *tcm_loop_wwn_attrs[] = { 1355 &tcm_loop_wwn_version.attr, 1356 NULL, 1357 }; 1358 1359 /* End items for tcm_loop_cit */ 1360 1361 static int tcm_loop_register_configfs(void) 1362 { 1363 struct target_fabric_configfs *fabric; 1364 struct config_group *tf_cg; 1365 int ret; 1366 /* 1367 * Set the TCM Loop HBA counter to zero 1368 */ 1369 tcm_loop_hba_no_cnt = 0; 1370 /* 1371 * Register the top level struct config_item_type with TCM core 1372 */ 1373 fabric = target_fabric_configfs_init(THIS_MODULE, "loopback"); 1374 if (IS_ERR(fabric)) { 1375 pr_err("tcm_loop_register_configfs() failed!\n"); 1376 return PTR_ERR(fabric); 1377 } 1378 /* 1379 * Setup the fabric API of function pointers used by target_core_mod 1380 */ 1381 fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name; 1382 fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident; 1383 fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn; 1384 fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag; 1385 fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth; 1386 fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id; 1387 fabric->tf_ops.tpg_get_pr_transport_id_len = 1388 &tcm_loop_get_pr_transport_id_len; 1389 fabric->tf_ops.tpg_parse_pr_out_transport_id = 1390 &tcm_loop_parse_pr_out_transport_id; 1391 fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode; 1392 fabric->tf_ops.tpg_check_demo_mode_cache = 1393 &tcm_loop_check_demo_mode_cache; 1394 fabric->tf_ops.tpg_check_demo_mode_write_protect = 1395 &tcm_loop_check_demo_mode_write_protect; 1396 fabric->tf_ops.tpg_check_prod_mode_write_protect = 1397 &tcm_loop_check_prod_mode_write_protect; 1398 /* 1399 * The TCM loopback fabric module runs in demo-mode to a local 1400 * virtual SCSI device, so fabric dependent initator ACLs are 1401 * not required. 1402 */ 1403 fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl; 1404 fabric->tf_ops.tpg_release_fabric_acl = 1405 &tcm_loop_tpg_release_fabric_acl; 1406 fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index; 1407 /* 1408 * Used for setting up remaining TCM resources in process context 1409 */ 1410 fabric->tf_ops.new_cmd_map = &tcm_loop_new_cmd_map; 1411 fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free; 1412 fabric->tf_ops.release_cmd = &tcm_loop_release_cmd; 1413 fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session; 1414 fabric->tf_ops.close_session = &tcm_loop_close_session; 1415 fabric->tf_ops.stop_session = &tcm_loop_stop_session; 1416 fabric->tf_ops.fall_back_to_erl0 = &tcm_loop_fall_back_to_erl0; 1417 fabric->tf_ops.sess_logged_in = &tcm_loop_sess_logged_in; 1418 fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index; 1419 fabric->tf_ops.sess_get_initiator_sid = NULL; 1420 fabric->tf_ops.write_pending = &tcm_loop_write_pending; 1421 fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status; 1422 /* 1423 * Not used for TCM loopback 1424 */ 1425 fabric->tf_ops.set_default_node_attributes = 1426 &tcm_loop_set_default_node_attributes; 1427 fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag; 1428 fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state; 1429 fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in; 1430 fabric->tf_ops.queue_status = &tcm_loop_queue_status; 1431 fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp; 1432 fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len; 1433 fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len; 1434 fabric->tf_ops.is_state_remove = &tcm_loop_is_state_remove; 1435 1436 tf_cg = &fabric->tf_group; 1437 /* 1438 * Setup function pointers for generic logic in target_core_fabric_configfs.c 1439 */ 1440 fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba; 1441 fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba; 1442 fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg; 1443 fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg; 1444 /* 1445 * fabric_post_link() and fabric_pre_unlink() are used for 1446 * registration and release of TCM Loop Virtual SCSI LUNs. 1447 */ 1448 fabric->tf_ops.fabric_post_link = &tcm_loop_port_link; 1449 fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink; 1450 fabric->tf_ops.fabric_make_np = NULL; 1451 fabric->tf_ops.fabric_drop_np = NULL; 1452 /* 1453 * Setup default attribute lists for various fabric->tf_cit_tmpl 1454 */ 1455 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs; 1456 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs; 1457 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL; 1458 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL; 1459 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL; 1460 /* 1461 * Once fabric->tf_ops has been setup, now register the fabric for 1462 * use within TCM 1463 */ 1464 ret = target_fabric_configfs_register(fabric); 1465 if (ret < 0) { 1466 pr_err("target_fabric_configfs_register() for" 1467 " TCM_Loop failed!\n"); 1468 target_fabric_configfs_free(fabric); 1469 return -1; 1470 } 1471 /* 1472 * Setup our local pointer to *fabric. 1473 */ 1474 tcm_loop_fabric_configfs = fabric; 1475 pr_debug("TCM_LOOP[0] - Set fabric ->" 1476 " tcm_loop_fabric_configfs\n"); 1477 return 0; 1478 } 1479 1480 static void tcm_loop_deregister_configfs(void) 1481 { 1482 if (!tcm_loop_fabric_configfs) 1483 return; 1484 1485 target_fabric_configfs_deregister(tcm_loop_fabric_configfs); 1486 tcm_loop_fabric_configfs = NULL; 1487 pr_debug("TCM_LOOP[0] - Cleared" 1488 " tcm_loop_fabric_configfs\n"); 1489 } 1490 1491 static int __init tcm_loop_fabric_init(void) 1492 { 1493 int ret; 1494 1495 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", 1496 sizeof(struct tcm_loop_cmd), 1497 __alignof__(struct tcm_loop_cmd), 1498 0, NULL); 1499 if (!tcm_loop_cmd_cache) { 1500 pr_debug("kmem_cache_create() for" 1501 " tcm_loop_cmd_cache failed\n"); 1502 return -ENOMEM; 1503 } 1504 1505 ret = tcm_loop_alloc_core_bus(); 1506 if (ret) 1507 return ret; 1508 1509 ret = tcm_loop_register_configfs(); 1510 if (ret) { 1511 tcm_loop_release_core_bus(); 1512 return ret; 1513 } 1514 1515 return 0; 1516 } 1517 1518 static void __exit tcm_loop_fabric_exit(void) 1519 { 1520 tcm_loop_deregister_configfs(); 1521 tcm_loop_release_core_bus(); 1522 kmem_cache_destroy(tcm_loop_cmd_cache); 1523 } 1524 1525 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); 1526 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>"); 1527 MODULE_LICENSE("GPL"); 1528 module_init(tcm_loop_fabric_init); 1529 module_exit(tcm_loop_fabric_exit); 1530