1 /*******************************************************************************
3 * This file contains the Linux/SCSI LLD virtual SCSI initiator driver
4 * for emulated SAS initiator ports
6 * © Copyright 2011-2013 Datera, Inc.
8 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
10 * Author: Nicholas A. Bellinger <nab@risingtidesystems.com>
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.
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 ****************************************************************************/
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>
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>
42 #define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev)
44 /* Local pointer to allocated TCM configfs fabric module */
45 static struct target_fabric_configfs *tcm_loop_fabric_configfs;
47 static struct workqueue_struct *tcm_loop_workqueue;
48 static struct kmem_cache *tcm_loop_cmd_cache;
50 static int tcm_loop_hba_no_cnt;
52 static int tcm_loop_queue_status(struct se_cmd *se_cmd);
55 * Called from struct target_core_fabric_ops->check_stop_free()
57 static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
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().
64 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
67 * Release the struct se_cmd, which will make a callback to release
68 * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
70 transport_generic_free_cmd(se_cmd, 0);
74 static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
76 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
77 struct tcm_loop_cmd, tl_se_cmd);
79 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
82 static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
84 seq_printf(m, "tcm_loop_proc_info()\n");
88 static int tcm_loop_driver_probe(struct device *);
89 static int tcm_loop_driver_remove(struct device *);
91 static int pseudo_lld_bus_match(struct device *dev,
92 struct device_driver *dev_driver)
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,
104 static struct device_driver tcm_loop_driverfs = {
106 .bus = &tcm_loop_lld_bus,
109 * Used with root_device_register() in tcm_loop_alloc_core_bus() below
111 struct device *tcm_loop_primary;
114 * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and
115 * drivers/scsi/libiscsi.c:iscsi_change_queue_depth()
117 static int tcm_loop_change_queue_depth(
118 struct scsi_device *sdev,
122 scsi_adjust_queue_depth(sdev, depth);
123 return sdev->queue_depth;
126 static void tcm_loop_submission_work(struct work_struct *work)
128 struct tcm_loop_cmd *tl_cmd =
129 container_of(work, struct tcm_loop_cmd, work);
130 struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
131 struct scsi_cmnd *sc = tl_cmd->sc;
132 struct tcm_loop_nexus *tl_nexus;
133 struct tcm_loop_hba *tl_hba;
134 struct tcm_loop_tpg *tl_tpg;
135 struct scatterlist *sgl_bidi = NULL;
136 u32 sgl_bidi_count = 0, transfer_length;
139 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
140 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
143 * Ensure that this tl_tpg reference from the incoming sc->device->id
144 * has already been configured via tcm_loop_make_naa_tpg().
146 if (!tl_tpg->tl_hba) {
147 set_host_byte(sc, DID_NO_CONNECT);
150 if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
151 set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
154 tl_nexus = tl_hba->tl_nexus;
156 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
157 " does not exist\n");
158 set_host_byte(sc, DID_ERROR);
161 if (scsi_bidi_cmnd(sc)) {
162 struct scsi_data_buffer *sdb = scsi_in(sc);
164 sgl_bidi = sdb->table.sgl;
165 sgl_bidi_count = sdb->table.nents;
166 se_cmd->se_cmd_flags |= SCF_BIDI;
170 transfer_length = scsi_transfer_length(sc);
171 if (!scsi_prot_sg_count(sc) &&
172 scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
173 se_cmd->prot_pto = true;
175 * loopback transport doesn't support
176 * WRITE_GENERATE, READ_STRIP protection
177 * information operations, go ahead unprotected.
179 transfer_length = scsi_bufflen(sc);
182 rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
183 &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
184 transfer_length, MSG_SIMPLE_TAG,
185 sc->sc_data_direction, 0,
186 scsi_sglist(sc), scsi_sg_count(sc),
187 sgl_bidi, sgl_bidi_count,
188 scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
190 set_host_byte(sc, DID_NO_CONNECT);
196 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
202 * ->queuecommand can be and usually is called from interrupt context, so
203 * defer the actual submission to a workqueue.
205 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
207 struct tcm_loop_cmd *tl_cmd;
209 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%llu got CDB: 0x%02x"
210 " scsi_buf_len: %u\n", sc->device->host->host_no,
211 sc->device->id, sc->device->channel, sc->device->lun,
212 sc->cmnd[0], scsi_bufflen(sc));
214 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
216 pr_err("Unable to allocate struct tcm_loop_cmd\n");
217 set_host_byte(sc, DID_ERROR);
223 tl_cmd->sc_cmd_tag = sc->request->tag;
224 INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
225 queue_work(tcm_loop_workqueue, &tl_cmd->work);
230 * Called from SCSI EH process context to issue a LUN_RESET TMR
231 * to struct scsi_device
233 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
234 struct tcm_loop_nexus *tl_nexus,
235 int lun, int task, enum tcm_tmreq_table tmr)
237 struct se_cmd *se_cmd = NULL;
238 struct se_session *se_sess;
239 struct se_portal_group *se_tpg;
240 struct tcm_loop_cmd *tl_cmd = NULL;
241 struct tcm_loop_tmr *tl_tmr = NULL;
242 int ret = TMR_FUNCTION_FAILED, rc;
244 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
246 pr_err("Unable to allocate memory for tl_cmd\n");
250 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
252 pr_err("Unable to allocate memory for tl_tmr\n");
255 init_waitqueue_head(&tl_tmr->tl_tmr_wait);
257 se_cmd = &tl_cmd->tl_se_cmd;
258 se_tpg = &tl_tpg->tl_se_tpg;
259 se_sess = tl_nexus->se_sess;
261 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
263 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
264 DMA_NONE, MSG_SIMPLE_TAG,
265 &tl_cmd->tl_sense_buf[0]);
267 rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL);
271 if (tmr == TMR_ABORT_TASK)
272 se_cmd->se_tmr_req->ref_task_tag = task;
275 * Locate the underlying TCM struct se_lun
277 if (transport_lookup_tmr_lun(se_cmd, lun) < 0) {
278 ret = TMR_LUN_DOES_NOT_EXIST;
282 * Queue the TMR to TCM Core and sleep waiting for
283 * tcm_loop_queue_tm_rsp() to wake us up.
285 transport_generic_handle_tmr(se_cmd);
286 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
288 * The TMR LUN_RESET has completed, check the response status and
289 * then release allocations.
291 ret = se_cmd->se_tmr_req->response;
294 transport_generic_free_cmd(se_cmd, 1);
296 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
301 static int tcm_loop_abort_task(struct scsi_cmnd *sc)
303 struct tcm_loop_hba *tl_hba;
304 struct tcm_loop_nexus *tl_nexus;
305 struct tcm_loop_tpg *tl_tpg;
309 * Locate the tcm_loop_hba_t pointer
311 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
313 * Locate the tl_nexus and se_sess pointers
315 tl_nexus = tl_hba->tl_nexus;
317 pr_err("Unable to perform device reset without"
318 " active I_T Nexus\n");
323 * Locate the tl_tpg pointer from TargetID in sc->device->id
325 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
326 ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun,
327 sc->request->tag, TMR_ABORT_TASK);
328 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
332 * Called from SCSI EH process context to issue a LUN_RESET TMR
333 * to struct scsi_device
335 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
337 struct tcm_loop_hba *tl_hba;
338 struct tcm_loop_nexus *tl_nexus;
339 struct tcm_loop_tpg *tl_tpg;
343 * Locate the tcm_loop_hba_t pointer
345 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
347 * Locate the tl_nexus and se_sess pointers
349 tl_nexus = tl_hba->tl_nexus;
351 pr_err("Unable to perform device reset without"
352 " active I_T Nexus\n");
356 * Locate the tl_tpg pointer from TargetID in sc->device->id
358 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
359 ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun,
361 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
364 static int tcm_loop_target_reset(struct scsi_cmnd *sc)
366 struct tcm_loop_hba *tl_hba;
367 struct tcm_loop_tpg *tl_tpg;
370 * Locate the tcm_loop_hba_t pointer
372 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
374 pr_err("Unable to perform device reset without"
375 " active I_T Nexus\n");
379 * Locate the tl_tpg pointer from TargetID in sc->device->id
381 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
383 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
389 static int tcm_loop_slave_alloc(struct scsi_device *sd)
391 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
395 static struct scsi_host_template tcm_loop_driver_template = {
396 .show_info = tcm_loop_show_info,
397 .proc_name = "tcm_loopback",
398 .name = "TCM_Loopback",
399 .queuecommand = tcm_loop_queuecommand,
400 .change_queue_depth = tcm_loop_change_queue_depth,
401 .change_queue_type = scsi_change_queue_type,
402 .eh_abort_handler = tcm_loop_abort_task,
403 .eh_device_reset_handler = tcm_loop_device_reset,
404 .eh_target_reset_handler = tcm_loop_target_reset,
409 .max_sectors = 0xFFFF,
410 .use_clustering = DISABLE_CLUSTERING,
411 .slave_alloc = tcm_loop_slave_alloc,
412 .module = THIS_MODULE,
414 .track_queue_depth = 1,
417 static int tcm_loop_driver_probe(struct device *dev)
419 struct tcm_loop_hba *tl_hba;
420 struct Scsi_Host *sh;
421 int error, host_prot;
423 tl_hba = to_tcm_loop_hba(dev);
425 sh = scsi_host_alloc(&tcm_loop_driver_template,
426 sizeof(struct tcm_loop_hba));
428 pr_err("Unable to allocate struct scsi_host\n");
434 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
436 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
438 * Setup single ID, Channel and LUN for now..
443 sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN;
445 host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
446 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
447 SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
449 scsi_host_set_prot(sh, host_prot);
450 scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
452 error = scsi_add_host(sh, &tl_hba->dev);
454 pr_err("%s: scsi_add_host failed\n", __func__);
461 static int tcm_loop_driver_remove(struct device *dev)
463 struct tcm_loop_hba *tl_hba;
464 struct Scsi_Host *sh;
466 tl_hba = to_tcm_loop_hba(dev);
469 scsi_remove_host(sh);
474 static void tcm_loop_release_adapter(struct device *dev)
476 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
482 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
484 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
488 tl_hba->dev.bus = &tcm_loop_lld_bus;
489 tl_hba->dev.parent = tcm_loop_primary;
490 tl_hba->dev.release = &tcm_loop_release_adapter;
491 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
493 ret = device_register(&tl_hba->dev);
495 pr_err("device_register() failed for"
496 " tl_hba->dev: %d\n", ret);
504 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
507 static int tcm_loop_alloc_core_bus(void)
511 tcm_loop_primary = root_device_register("tcm_loop_0");
512 if (IS_ERR(tcm_loop_primary)) {
513 pr_err("Unable to allocate tcm_loop_primary\n");
514 return PTR_ERR(tcm_loop_primary);
517 ret = bus_register(&tcm_loop_lld_bus);
519 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
523 ret = driver_register(&tcm_loop_driverfs);
525 pr_err("driver_register() failed for"
526 "tcm_loop_driverfs\n");
530 pr_debug("Initialized TCM Loop Core Bus\n");
534 bus_unregister(&tcm_loop_lld_bus);
536 root_device_unregister(tcm_loop_primary);
540 static void tcm_loop_release_core_bus(void)
542 driver_unregister(&tcm_loop_driverfs);
543 bus_unregister(&tcm_loop_lld_bus);
544 root_device_unregister(tcm_loop_primary);
546 pr_debug("Releasing TCM Loop Core BUS\n");
549 static char *tcm_loop_get_fabric_name(void)
554 static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg)
556 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
557 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
559 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
560 * time based on the protocol dependent prefix of the passed configfs group.
562 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric
563 * ProtocolID using target_core_fabric_lib.c symbols.
565 switch (tl_hba->tl_proto_id) {
566 case SCSI_PROTOCOL_SAS:
567 return sas_get_fabric_proto_ident(se_tpg);
568 case SCSI_PROTOCOL_FCP:
569 return fc_get_fabric_proto_ident(se_tpg);
570 case SCSI_PROTOCOL_ISCSI:
571 return iscsi_get_fabric_proto_ident(se_tpg);
573 pr_err("Unknown tl_proto_id: 0x%02x, using"
574 " SAS emulation\n", tl_hba->tl_proto_id);
578 return sas_get_fabric_proto_ident(se_tpg);
581 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
583 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
585 * Return the passed NAA identifier for the SAS Target Port
587 return &tl_tpg->tl_hba->tl_wwn_address[0];
590 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
592 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
594 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
595 * to represent the SCSI Target Port.
597 return tl_tpg->tl_tpgt;
600 static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg)
605 static u32 tcm_loop_get_pr_transport_id(
606 struct se_portal_group *se_tpg,
607 struct se_node_acl *se_nacl,
608 struct t10_pr_registration *pr_reg,
612 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
613 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
615 switch (tl_hba->tl_proto_id) {
616 case SCSI_PROTOCOL_SAS:
617 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
619 case SCSI_PROTOCOL_FCP:
620 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
622 case SCSI_PROTOCOL_ISCSI:
623 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
626 pr_err("Unknown tl_proto_id: 0x%02x, using"
627 " SAS emulation\n", tl_hba->tl_proto_id);
631 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
635 static u32 tcm_loop_get_pr_transport_id_len(
636 struct se_portal_group *se_tpg,
637 struct se_node_acl *se_nacl,
638 struct t10_pr_registration *pr_reg,
641 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
642 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
644 switch (tl_hba->tl_proto_id) {
645 case SCSI_PROTOCOL_SAS:
646 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
648 case SCSI_PROTOCOL_FCP:
649 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
651 case SCSI_PROTOCOL_ISCSI:
652 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
655 pr_err("Unknown tl_proto_id: 0x%02x, using"
656 " SAS emulation\n", tl_hba->tl_proto_id);
660 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
665 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
666 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
668 static char *tcm_loop_parse_pr_out_transport_id(
669 struct se_portal_group *se_tpg,
672 char **port_nexus_ptr)
674 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
675 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
677 switch (tl_hba->tl_proto_id) {
678 case SCSI_PROTOCOL_SAS:
679 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
681 case SCSI_PROTOCOL_FCP:
682 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
684 case SCSI_PROTOCOL_ISCSI:
685 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
688 pr_err("Unknown tl_proto_id: 0x%02x, using"
689 " SAS emulation\n", tl_hba->tl_proto_id);
693 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
698 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
699 * based upon the incoming fabric dependent SCSI Initiator Port
701 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
706 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
712 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
713 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
715 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
721 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
722 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
723 * It has been added here as a nop for target_fabric_tf_ops_check()
725 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
730 static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl(
731 struct se_portal_group *se_tpg)
733 struct tcm_loop_nacl *tl_nacl;
735 tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL);
737 pr_err("Unable to allocate struct tcm_loop_nacl\n");
741 return &tl_nacl->se_node_acl;
744 static void tcm_loop_tpg_release_fabric_acl(
745 struct se_portal_group *se_tpg,
746 struct se_node_acl *se_nacl)
748 struct tcm_loop_nacl *tl_nacl = container_of(se_nacl,
749 struct tcm_loop_nacl, se_node_acl);
754 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
759 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
764 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
769 static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
771 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
772 struct tcm_loop_cmd, tl_se_cmd);
774 return tl_cmd->sc_cmd_tag;
777 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
779 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
780 struct tcm_loop_cmd, tl_se_cmd);
782 return tl_cmd->sc_cmd_state;
785 static int tcm_loop_shutdown_session(struct se_session *se_sess)
790 static void tcm_loop_close_session(struct se_session *se_sess)
795 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
798 * Since Linux/SCSI has already sent down a struct scsi_cmnd
799 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
800 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
801 * format with transport_generic_map_mem_to_cmd().
803 * We now tell TCM to add this WRITE CDB directly into the TCM storage
804 * object execution queue.
806 target_execute_cmd(se_cmd);
810 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
815 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
817 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
818 struct tcm_loop_cmd, tl_se_cmd);
819 struct scsi_cmnd *sc = tl_cmd->sc;
821 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
822 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
824 sc->result = SAM_STAT_GOOD;
825 set_host_byte(sc, DID_OK);
826 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
827 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
828 scsi_set_resid(sc, se_cmd->residual_count);
833 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
835 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
836 struct tcm_loop_cmd, tl_se_cmd);
837 struct scsi_cmnd *sc = tl_cmd->sc;
839 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
840 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
842 if (se_cmd->sense_buffer &&
843 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
844 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
846 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
847 SCSI_SENSE_BUFFERSIZE);
848 sc->result = SAM_STAT_CHECK_CONDITION;
849 set_driver_byte(sc, DRIVER_SENSE);
851 sc->result = se_cmd->scsi_status;
853 set_host_byte(sc, DID_OK);
854 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
855 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
856 scsi_set_resid(sc, se_cmd->residual_count);
861 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
863 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
864 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
866 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
867 * and wake up the wait_queue_head_t in tcm_loop_device_reset()
869 atomic_set(&tl_tmr->tmr_complete, 1);
870 wake_up(&tl_tmr->tl_tmr_wait);
873 static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
878 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
880 switch (tl_hba->tl_proto_id) {
881 case SCSI_PROTOCOL_SAS:
883 case SCSI_PROTOCOL_FCP:
885 case SCSI_PROTOCOL_ISCSI:
894 /* Start items for tcm_loop_port_cit */
896 static int tcm_loop_port_link(
897 struct se_portal_group *se_tpg,
900 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
901 struct tcm_loop_tpg, tl_se_tpg);
902 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
904 atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
906 * Add Linux/SCSI struct scsi_device by HCTL
908 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
910 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
914 static void tcm_loop_port_unlink(
915 struct se_portal_group *se_tpg,
916 struct se_lun *se_lun)
918 struct scsi_device *sd;
919 struct tcm_loop_hba *tl_hba;
920 struct tcm_loop_tpg *tl_tpg;
922 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
923 tl_hba = tl_tpg->tl_hba;
925 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
926 se_lun->unpacked_lun);
928 pr_err("Unable to locate struct scsi_device for %d:%d:"
929 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
933 * Remove Linux/SCSI struct scsi_device by HCTL
935 scsi_remove_device(sd);
938 atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
940 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
943 /* End items for tcm_loop_port_cit */
945 /* Start items for tcm_loop_nexus_cit */
947 static int tcm_loop_make_nexus(
948 struct tcm_loop_tpg *tl_tpg,
951 struct se_portal_group *se_tpg;
952 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
953 struct tcm_loop_nexus *tl_nexus;
956 if (tl_tpg->tl_hba->tl_nexus) {
957 pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n");
960 se_tpg = &tl_tpg->tl_se_tpg;
962 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
964 pr_err("Unable to allocate struct tcm_loop_nexus\n");
968 * Initialize the struct se_session pointer
970 tl_nexus->se_sess = transport_init_session(TARGET_PROT_ALL);
971 if (IS_ERR(tl_nexus->se_sess)) {
972 ret = PTR_ERR(tl_nexus->se_sess);
976 * Since we are running in 'demo mode' this call with generate a
977 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
978 * Initiator port name of the passed configfs group 'name'.
980 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
981 se_tpg, (unsigned char *)name);
982 if (!tl_nexus->se_sess->se_node_acl) {
983 transport_free_session(tl_nexus->se_sess);
987 * Now, register the SAS I_T Nexus as active with the call to
988 * transport_register_session()
990 __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
991 tl_nexus->se_sess, tl_nexus);
992 tl_tpg->tl_hba->tl_nexus = tl_nexus;
993 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
994 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1003 static int tcm_loop_drop_nexus(
1004 struct tcm_loop_tpg *tpg)
1006 struct se_session *se_sess;
1007 struct tcm_loop_nexus *tl_nexus;
1008 struct tcm_loop_hba *tl_hba = tpg->tl_hba;
1013 tl_nexus = tl_hba->tl_nexus;
1017 se_sess = tl_nexus->se_sess;
1021 if (atomic_read(&tpg->tl_tpg_port_count)) {
1022 pr_err("Unable to remove TCM_Loop I_T Nexus with"
1023 " active TPG port count: %d\n",
1024 atomic_read(&tpg->tl_tpg_port_count));
1028 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
1029 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1030 tl_nexus->se_sess->se_node_acl->initiatorname);
1032 * Release the SCSI I_T Nexus to the emulated SAS Target Port
1034 transport_deregister_session(tl_nexus->se_sess);
1035 tpg->tl_hba->tl_nexus = NULL;
1040 /* End items for tcm_loop_nexus_cit */
1042 static ssize_t tcm_loop_tpg_show_nexus(
1043 struct se_portal_group *se_tpg,
1046 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1047 struct tcm_loop_tpg, tl_se_tpg);
1048 struct tcm_loop_nexus *tl_nexus;
1051 tl_nexus = tl_tpg->tl_hba->tl_nexus;
1055 ret = snprintf(page, PAGE_SIZE, "%s\n",
1056 tl_nexus->se_sess->se_node_acl->initiatorname);
1061 static ssize_t tcm_loop_tpg_store_nexus(
1062 struct se_portal_group *se_tpg,
1066 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1067 struct tcm_loop_tpg, tl_se_tpg);
1068 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1069 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
1072 * Shutdown the active I_T nexus if 'NULL' is passed..
1074 if (!strncmp(page, "NULL", 4)) {
1075 ret = tcm_loop_drop_nexus(tl_tpg);
1076 return (!ret) ? count : ret;
1079 * Otherwise make sure the passed virtual Initiator port WWN matches
1080 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
1081 * tcm_loop_make_nexus()
1083 if (strlen(page) >= TL_WWN_ADDR_LEN) {
1084 pr_err("Emulated NAA Sas Address: %s, exceeds"
1085 " max: %d\n", page, TL_WWN_ADDR_LEN);
1088 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
1090 ptr = strstr(i_port, "naa.");
1092 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
1093 pr_err("Passed SAS Initiator Port %s does not"
1094 " match target port protoid: %s\n", i_port,
1095 tcm_loop_dump_proto_id(tl_hba));
1098 port_ptr = &i_port[0];
1101 ptr = strstr(i_port, "fc.");
1103 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
1104 pr_err("Passed FCP Initiator Port %s does not"
1105 " match target port protoid: %s\n", i_port,
1106 tcm_loop_dump_proto_id(tl_hba));
1109 port_ptr = &i_port[3]; /* Skip over "fc." */
1112 ptr = strstr(i_port, "iqn.");
1114 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
1115 pr_err("Passed iSCSI Initiator Port %s does not"
1116 " match target port protoid: %s\n", i_port,
1117 tcm_loop_dump_proto_id(tl_hba));
1120 port_ptr = &i_port[0];
1123 pr_err("Unable to locate prefix for emulated Initiator Port:"
1127 * Clear any trailing newline for the NAA WWN
1130 if (i_port[strlen(i_port)-1] == '\n')
1131 i_port[strlen(i_port)-1] = '\0';
1133 ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
1140 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR);
1142 static ssize_t tcm_loop_tpg_show_transport_status(
1143 struct se_portal_group *se_tpg,
1146 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1147 struct tcm_loop_tpg, tl_se_tpg);
1148 const char *status = NULL;
1149 ssize_t ret = -EINVAL;
1151 switch (tl_tpg->tl_transport_status) {
1152 case TCM_TRANSPORT_ONLINE:
1155 case TCM_TRANSPORT_OFFLINE:
1163 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
1168 static ssize_t tcm_loop_tpg_store_transport_status(
1169 struct se_portal_group *se_tpg,
1173 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1174 struct tcm_loop_tpg, tl_se_tpg);
1176 if (!strncmp(page, "online", 6)) {
1177 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
1180 if (!strncmp(page, "offline", 7)) {
1181 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
1187 TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR);
1189 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1190 &tcm_loop_tpg_nexus.attr,
1191 &tcm_loop_tpg_transport_status.attr,
1195 /* Start items for tcm_loop_naa_cit */
1197 static struct se_portal_group *tcm_loop_make_naa_tpg(
1199 struct config_group *group,
1202 struct tcm_loop_hba *tl_hba = container_of(wwn,
1203 struct tcm_loop_hba, tl_hba_wwn);
1204 struct tcm_loop_tpg *tl_tpg;
1205 char *tpgt_str, *end_ptr;
1207 unsigned short int tpgt;
1209 tpgt_str = strstr(name, "tpgt_");
1211 pr_err("Unable to locate \"tpgt_#\" directory"
1213 return ERR_PTR(-EINVAL);
1215 tpgt_str += 5; /* Skip ahead of "tpgt_" */
1216 tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0);
1218 if (tpgt >= TL_TPGS_PER_HBA) {
1219 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1220 " %u\n", tpgt, TL_TPGS_PER_HBA);
1221 return ERR_PTR(-EINVAL);
1223 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1224 tl_tpg->tl_hba = tl_hba;
1225 tl_tpg->tl_tpgt = tpgt;
1227 * Register the tl_tpg as a emulated SAS TCM Target Endpoint
1229 ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops,
1230 wwn, &tl_tpg->tl_se_tpg, tl_tpg,
1231 TRANSPORT_TPG_TYPE_NORMAL);
1233 return ERR_PTR(-ENOMEM);
1235 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1236 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1237 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1239 return &tl_tpg->tl_se_tpg;
1242 static void tcm_loop_drop_naa_tpg(
1243 struct se_portal_group *se_tpg)
1245 struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1246 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1247 struct tcm_loop_tpg, tl_se_tpg);
1248 struct tcm_loop_hba *tl_hba;
1249 unsigned short tpgt;
1251 tl_hba = tl_tpg->tl_hba;
1252 tpgt = tl_tpg->tl_tpgt;
1254 * Release the I_T Nexus for the Virtual SAS link if present
1256 tcm_loop_drop_nexus(tl_tpg);
1258 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1260 core_tpg_deregister(se_tpg);
1262 tl_tpg->tl_hba = NULL;
1263 tl_tpg->tl_tpgt = 0;
1265 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1266 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1267 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1270 /* End items for tcm_loop_naa_cit */
1272 /* Start items for tcm_loop_cit */
1274 static struct se_wwn *tcm_loop_make_scsi_hba(
1275 struct target_fabric_configfs *tf,
1276 struct config_group *group,
1279 struct tcm_loop_hba *tl_hba;
1280 struct Scsi_Host *sh;
1284 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1286 pr_err("Unable to allocate struct tcm_loop_hba\n");
1287 return ERR_PTR(-ENOMEM);
1290 * Determine the emulated Protocol Identifier and Target Port Name
1291 * based on the incoming configfs directory name.
1293 ptr = strstr(name, "naa.");
1295 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1298 ptr = strstr(name, "fc.");
1300 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1301 off = 3; /* Skip over "fc." */
1304 ptr = strstr(name, "iqn.");
1306 pr_err("Unable to locate prefix for emulated Target "
1307 "Port: %s\n", name);
1311 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1314 if (strlen(name) >= TL_WWN_ADDR_LEN) {
1315 pr_err("Emulated NAA %s Address: %s, exceeds"
1316 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1321 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1324 * Call device_register(tl_hba->dev) to register the emulated
1325 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1326 * device_register() callbacks in tcm_loop_driver_probe()
1328 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1333 tcm_loop_hba_no_cnt++;
1334 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1335 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1336 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1338 return &tl_hba->tl_hba_wwn;
1341 return ERR_PTR(ret);
1344 static void tcm_loop_drop_scsi_hba(
1347 struct tcm_loop_hba *tl_hba = container_of(wwn,
1348 struct tcm_loop_hba, tl_hba_wwn);
1350 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1351 " SAS Address: %s at Linux/SCSI Host ID: %d\n",
1352 tl_hba->tl_wwn_address, tl_hba->sh->host_no);
1354 * Call device_unregister() on the original tl_hba->dev.
1355 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1358 device_unregister(&tl_hba->dev);
1361 /* Start items for tcm_loop_cit */
1362 static ssize_t tcm_loop_wwn_show_attr_version(
1363 struct target_fabric_configfs *tf,
1366 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1369 TF_WWN_ATTR_RO(tcm_loop, version);
1371 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1372 &tcm_loop_wwn_version.attr,
1376 /* End items for tcm_loop_cit */
1378 static int tcm_loop_register_configfs(void)
1380 struct target_fabric_configfs *fabric;
1383 * Set the TCM Loop HBA counter to zero
1385 tcm_loop_hba_no_cnt = 0;
1387 * Register the top level struct config_item_type with TCM core
1389 fabric = target_fabric_configfs_init(THIS_MODULE, "loopback");
1390 if (IS_ERR(fabric)) {
1391 pr_err("tcm_loop_register_configfs() failed!\n");
1392 return PTR_ERR(fabric);
1395 * Setup the fabric API of function pointers used by target_core_mod
1397 fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name;
1398 fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident;
1399 fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn;
1400 fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag;
1401 fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth;
1402 fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id;
1403 fabric->tf_ops.tpg_get_pr_transport_id_len =
1404 &tcm_loop_get_pr_transport_id_len;
1405 fabric->tf_ops.tpg_parse_pr_out_transport_id =
1406 &tcm_loop_parse_pr_out_transport_id;
1407 fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode;
1408 fabric->tf_ops.tpg_check_demo_mode_cache =
1409 &tcm_loop_check_demo_mode_cache;
1410 fabric->tf_ops.tpg_check_demo_mode_write_protect =
1411 &tcm_loop_check_demo_mode_write_protect;
1412 fabric->tf_ops.tpg_check_prod_mode_write_protect =
1413 &tcm_loop_check_prod_mode_write_protect;
1415 * The TCM loopback fabric module runs in demo-mode to a local
1416 * virtual SCSI device, so fabric dependent initator ACLs are
1419 fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl;
1420 fabric->tf_ops.tpg_release_fabric_acl =
1421 &tcm_loop_tpg_release_fabric_acl;
1422 fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index;
1424 * Used for setting up remaining TCM resources in process context
1426 fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free;
1427 fabric->tf_ops.release_cmd = &tcm_loop_release_cmd;
1428 fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session;
1429 fabric->tf_ops.close_session = &tcm_loop_close_session;
1430 fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index;
1431 fabric->tf_ops.sess_get_initiator_sid = NULL;
1432 fabric->tf_ops.write_pending = &tcm_loop_write_pending;
1433 fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status;
1435 * Not used for TCM loopback
1437 fabric->tf_ops.set_default_node_attributes =
1438 &tcm_loop_set_default_node_attributes;
1439 fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag;
1440 fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state;
1441 fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in;
1442 fabric->tf_ops.queue_status = &tcm_loop_queue_status;
1443 fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp;
1444 fabric->tf_ops.aborted_task = &tcm_loop_aborted_task;
1447 * Setup function pointers for generic logic in target_core_fabric_configfs.c
1449 fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba;
1450 fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba;
1451 fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg;
1452 fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg;
1454 * fabric_post_link() and fabric_pre_unlink() are used for
1455 * registration and release of TCM Loop Virtual SCSI LUNs.
1457 fabric->tf_ops.fabric_post_link = &tcm_loop_port_link;
1458 fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink;
1459 fabric->tf_ops.fabric_make_np = NULL;
1460 fabric->tf_ops.fabric_drop_np = NULL;
1462 * Setup default attribute lists for various fabric->tf_cit_tmpl
1464 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs;
1465 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs;
1466 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
1467 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
1468 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
1470 * Once fabric->tf_ops has been setup, now register the fabric for
1473 ret = target_fabric_configfs_register(fabric);
1475 pr_err("target_fabric_configfs_register() for"
1476 " TCM_Loop failed!\n");
1477 target_fabric_configfs_free(fabric);
1481 * Setup our local pointer to *fabric.
1483 tcm_loop_fabric_configfs = fabric;
1484 pr_debug("TCM_LOOP[0] - Set fabric ->"
1485 " tcm_loop_fabric_configfs\n");
1489 static void tcm_loop_deregister_configfs(void)
1491 if (!tcm_loop_fabric_configfs)
1494 target_fabric_configfs_deregister(tcm_loop_fabric_configfs);
1495 tcm_loop_fabric_configfs = NULL;
1496 pr_debug("TCM_LOOP[0] - Cleared"
1497 " tcm_loop_fabric_configfs\n");
1500 static int __init tcm_loop_fabric_init(void)
1504 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1505 if (!tcm_loop_workqueue)
1508 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1509 sizeof(struct tcm_loop_cmd),
1510 __alignof__(struct tcm_loop_cmd),
1512 if (!tcm_loop_cmd_cache) {
1513 pr_debug("kmem_cache_create() for"
1514 " tcm_loop_cmd_cache failed\n");
1515 goto out_destroy_workqueue;
1518 ret = tcm_loop_alloc_core_bus();
1520 goto out_destroy_cache;
1522 ret = tcm_loop_register_configfs();
1524 goto out_release_core_bus;
1528 out_release_core_bus:
1529 tcm_loop_release_core_bus();
1531 kmem_cache_destroy(tcm_loop_cmd_cache);
1532 out_destroy_workqueue:
1533 destroy_workqueue(tcm_loop_workqueue);
1538 static void __exit tcm_loop_fabric_exit(void)
1540 tcm_loop_deregister_configfs();
1541 tcm_loop_release_core_bus();
1542 kmem_cache_destroy(tcm_loop_cmd_cache);
1543 destroy_workqueue(tcm_loop_workqueue);
1546 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1547 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1548 MODULE_LICENSE("GPL");
1549 module_init(tcm_loop_fabric_init);
1550 module_exit(tcm_loop_fabric_exit);