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