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;
113 static void tcm_loop_submission_work(struct work_struct *work)
115 struct tcm_loop_cmd *tl_cmd =
116 container_of(work, struct tcm_loop_cmd, work);
117 struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
118 struct scsi_cmnd *sc = tl_cmd->sc;
119 struct tcm_loop_nexus *tl_nexus;
120 struct tcm_loop_hba *tl_hba;
121 struct tcm_loop_tpg *tl_tpg;
122 struct scatterlist *sgl_bidi = NULL;
123 u32 sgl_bidi_count = 0, transfer_length;
126 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
127 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
130 * Ensure that this tl_tpg reference from the incoming sc->device->id
131 * has already been configured via tcm_loop_make_naa_tpg().
133 if (!tl_tpg->tl_hba) {
134 set_host_byte(sc, DID_NO_CONNECT);
137 if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
138 set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
141 tl_nexus = tl_tpg->tl_nexus;
143 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
144 " does not exist\n");
145 set_host_byte(sc, DID_ERROR);
148 if (scsi_bidi_cmnd(sc)) {
149 struct scsi_data_buffer *sdb = scsi_in(sc);
151 sgl_bidi = sdb->table.sgl;
152 sgl_bidi_count = sdb->table.nents;
153 se_cmd->se_cmd_flags |= SCF_BIDI;
157 transfer_length = scsi_transfer_length(sc);
158 if (!scsi_prot_sg_count(sc) &&
159 scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
160 se_cmd->prot_pto = true;
162 * loopback transport doesn't support
163 * WRITE_GENERATE, READ_STRIP protection
164 * information operations, go ahead unprotected.
166 transfer_length = scsi_bufflen(sc);
169 rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
170 &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
171 transfer_length, TCM_SIMPLE_TAG,
172 sc->sc_data_direction, 0,
173 scsi_sglist(sc), scsi_sg_count(sc),
174 sgl_bidi, sgl_bidi_count,
175 scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
177 set_host_byte(sc, DID_NO_CONNECT);
183 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
189 * ->queuecommand can be and usually is called from interrupt context, so
190 * defer the actual submission to a workqueue.
192 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
194 struct tcm_loop_cmd *tl_cmd;
196 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%llu got CDB: 0x%02x"
197 " scsi_buf_len: %u\n", sc->device->host->host_no,
198 sc->device->id, sc->device->channel, sc->device->lun,
199 sc->cmnd[0], scsi_bufflen(sc));
201 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
203 pr_err("Unable to allocate struct tcm_loop_cmd\n");
204 set_host_byte(sc, DID_ERROR);
210 tl_cmd->sc_cmd_tag = sc->request->tag;
211 INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
212 queue_work(tcm_loop_workqueue, &tl_cmd->work);
217 * Called from SCSI EH process context to issue a LUN_RESET TMR
218 * to struct scsi_device
220 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
221 int lun, int task, enum tcm_tmreq_table tmr)
223 struct se_cmd *se_cmd = NULL;
224 struct se_session *se_sess;
225 struct se_portal_group *se_tpg;
226 struct tcm_loop_nexus *tl_nexus;
227 struct tcm_loop_cmd *tl_cmd = NULL;
228 struct tcm_loop_tmr *tl_tmr = NULL;
229 int ret = TMR_FUNCTION_FAILED, rc;
232 * Locate the tl_nexus and se_sess pointers
234 tl_nexus = tl_tpg->tl_nexus;
236 pr_err("Unable to perform device reset without"
237 " active I_T Nexus\n");
241 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
243 pr_err("Unable to allocate memory for tl_cmd\n");
247 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
249 pr_err("Unable to allocate memory for tl_tmr\n");
252 init_waitqueue_head(&tl_tmr->tl_tmr_wait);
254 se_cmd = &tl_cmd->tl_se_cmd;
255 se_tpg = &tl_tpg->tl_se_tpg;
256 se_sess = tl_tpg->tl_nexus->se_sess;
258 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
260 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
261 DMA_NONE, TCM_SIMPLE_TAG,
262 &tl_cmd->tl_sense_buf[0]);
264 rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL);
268 if (tmr == TMR_ABORT_TASK)
269 se_cmd->se_tmr_req->ref_task_tag = task;
272 * Locate the underlying TCM struct se_lun
274 if (transport_lookup_tmr_lun(se_cmd, lun) < 0) {
275 ret = TMR_LUN_DOES_NOT_EXIST;
279 * Queue the TMR to TCM Core and sleep waiting for
280 * tcm_loop_queue_tm_rsp() to wake us up.
282 transport_generic_handle_tmr(se_cmd);
283 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
285 * The TMR LUN_RESET has completed, check the response status and
286 * then release allocations.
288 ret = se_cmd->se_tmr_req->response;
291 transport_generic_free_cmd(se_cmd, 1);
293 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
298 static int tcm_loop_abort_task(struct scsi_cmnd *sc)
300 struct tcm_loop_hba *tl_hba;
301 struct tcm_loop_tpg *tl_tpg;
305 * Locate the tcm_loop_hba_t pointer
307 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
308 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
309 ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
310 sc->request->tag, TMR_ABORT_TASK);
311 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
315 * Called from SCSI EH process context to issue a LUN_RESET TMR
316 * to struct scsi_device
318 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
320 struct tcm_loop_hba *tl_hba;
321 struct tcm_loop_tpg *tl_tpg;
325 * Locate the tcm_loop_hba_t pointer
327 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
328 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
330 ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
332 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
335 static int tcm_loop_target_reset(struct scsi_cmnd *sc)
337 struct tcm_loop_hba *tl_hba;
338 struct tcm_loop_tpg *tl_tpg;
341 * Locate the tcm_loop_hba_t pointer
343 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
345 pr_err("Unable to perform device reset without"
346 " active I_T Nexus\n");
350 * Locate the tl_tpg pointer from TargetID in sc->device->id
352 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
354 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
360 static int tcm_loop_slave_alloc(struct scsi_device *sd)
362 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
366 static struct scsi_host_template tcm_loop_driver_template = {
367 .show_info = tcm_loop_show_info,
368 .proc_name = "tcm_loopback",
369 .name = "TCM_Loopback",
370 .queuecommand = tcm_loop_queuecommand,
371 .change_queue_depth = scsi_change_queue_depth,
372 .eh_abort_handler = tcm_loop_abort_task,
373 .eh_device_reset_handler = tcm_loop_device_reset,
374 .eh_target_reset_handler = tcm_loop_target_reset,
379 .max_sectors = 0xFFFF,
380 .use_clustering = DISABLE_CLUSTERING,
381 .slave_alloc = tcm_loop_slave_alloc,
382 .module = THIS_MODULE,
384 .track_queue_depth = 1,
387 static int tcm_loop_driver_probe(struct device *dev)
389 struct tcm_loop_hba *tl_hba;
390 struct Scsi_Host *sh;
391 int error, host_prot;
393 tl_hba = to_tcm_loop_hba(dev);
395 sh = scsi_host_alloc(&tcm_loop_driver_template,
396 sizeof(struct tcm_loop_hba));
398 pr_err("Unable to allocate struct scsi_host\n");
404 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
406 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
408 * Setup single ID, Channel and LUN for now..
413 sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN;
415 host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
416 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
417 SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
419 scsi_host_set_prot(sh, host_prot);
420 scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
422 error = scsi_add_host(sh, &tl_hba->dev);
424 pr_err("%s: scsi_add_host failed\n", __func__);
431 static int tcm_loop_driver_remove(struct device *dev)
433 struct tcm_loop_hba *tl_hba;
434 struct Scsi_Host *sh;
436 tl_hba = to_tcm_loop_hba(dev);
439 scsi_remove_host(sh);
444 static void tcm_loop_release_adapter(struct device *dev)
446 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
452 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
454 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
458 tl_hba->dev.bus = &tcm_loop_lld_bus;
459 tl_hba->dev.parent = tcm_loop_primary;
460 tl_hba->dev.release = &tcm_loop_release_adapter;
461 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
463 ret = device_register(&tl_hba->dev);
465 pr_err("device_register() failed for"
466 " tl_hba->dev: %d\n", ret);
474 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
477 static int tcm_loop_alloc_core_bus(void)
481 tcm_loop_primary = root_device_register("tcm_loop_0");
482 if (IS_ERR(tcm_loop_primary)) {
483 pr_err("Unable to allocate tcm_loop_primary\n");
484 return PTR_ERR(tcm_loop_primary);
487 ret = bus_register(&tcm_loop_lld_bus);
489 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
493 ret = driver_register(&tcm_loop_driverfs);
495 pr_err("driver_register() failed for"
496 "tcm_loop_driverfs\n");
500 pr_debug("Initialized TCM Loop Core Bus\n");
504 bus_unregister(&tcm_loop_lld_bus);
506 root_device_unregister(tcm_loop_primary);
510 static void tcm_loop_release_core_bus(void)
512 driver_unregister(&tcm_loop_driverfs);
513 bus_unregister(&tcm_loop_lld_bus);
514 root_device_unregister(tcm_loop_primary);
516 pr_debug("Releasing TCM Loop Core BUS\n");
519 static char *tcm_loop_get_fabric_name(void)
524 static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg)
526 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
527 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
529 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
530 * time based on the protocol dependent prefix of the passed configfs group.
532 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric
533 * ProtocolID using target_core_fabric_lib.c symbols.
535 switch (tl_hba->tl_proto_id) {
536 case SCSI_PROTOCOL_SAS:
537 return sas_get_fabric_proto_ident(se_tpg);
538 case SCSI_PROTOCOL_FCP:
539 return fc_get_fabric_proto_ident(se_tpg);
540 case SCSI_PROTOCOL_ISCSI:
541 return iscsi_get_fabric_proto_ident(se_tpg);
543 pr_err("Unknown tl_proto_id: 0x%02x, using"
544 " SAS emulation\n", tl_hba->tl_proto_id);
548 return sas_get_fabric_proto_ident(se_tpg);
551 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
553 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
555 * Return the passed NAA identifier for the SAS Target Port
557 return &tl_tpg->tl_hba->tl_wwn_address[0];
560 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
562 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
564 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
565 * to represent the SCSI Target Port.
567 return tl_tpg->tl_tpgt;
570 static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg)
575 static u32 tcm_loop_get_pr_transport_id(
576 struct se_portal_group *se_tpg,
577 struct se_node_acl *se_nacl,
578 struct t10_pr_registration *pr_reg,
582 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
583 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
585 switch (tl_hba->tl_proto_id) {
586 case SCSI_PROTOCOL_SAS:
587 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
589 case SCSI_PROTOCOL_FCP:
590 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
592 case SCSI_PROTOCOL_ISCSI:
593 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
596 pr_err("Unknown tl_proto_id: 0x%02x, using"
597 " SAS emulation\n", tl_hba->tl_proto_id);
601 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
605 static u32 tcm_loop_get_pr_transport_id_len(
606 struct se_portal_group *se_tpg,
607 struct se_node_acl *se_nacl,
608 struct t10_pr_registration *pr_reg,
611 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
612 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
614 switch (tl_hba->tl_proto_id) {
615 case SCSI_PROTOCOL_SAS:
616 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
618 case SCSI_PROTOCOL_FCP:
619 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
621 case SCSI_PROTOCOL_ISCSI:
622 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
625 pr_err("Unknown tl_proto_id: 0x%02x, using"
626 " SAS emulation\n", tl_hba->tl_proto_id);
630 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
635 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
636 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
638 static char *tcm_loop_parse_pr_out_transport_id(
639 struct se_portal_group *se_tpg,
642 char **port_nexus_ptr)
644 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
645 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
647 switch (tl_hba->tl_proto_id) {
648 case SCSI_PROTOCOL_SAS:
649 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
651 case SCSI_PROTOCOL_FCP:
652 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
654 case SCSI_PROTOCOL_ISCSI:
655 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
658 pr_err("Unknown tl_proto_id: 0x%02x, using"
659 " SAS emulation\n", tl_hba->tl_proto_id);
663 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
668 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
669 * based upon the incoming fabric dependent SCSI Initiator Port
671 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
676 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
682 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
683 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
685 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
691 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
692 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
693 * It has been added here as a nop for target_fabric_tf_ops_check()
695 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
700 static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl(
701 struct se_portal_group *se_tpg)
703 struct tcm_loop_nacl *tl_nacl;
705 tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL);
707 pr_err("Unable to allocate struct tcm_loop_nacl\n");
711 return &tl_nacl->se_node_acl;
714 static void tcm_loop_tpg_release_fabric_acl(
715 struct se_portal_group *se_tpg,
716 struct se_node_acl *se_nacl)
718 struct tcm_loop_nacl *tl_nacl = container_of(se_nacl,
719 struct tcm_loop_nacl, se_node_acl);
724 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
729 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
734 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
739 static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
741 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
742 struct tcm_loop_cmd, tl_se_cmd);
744 return tl_cmd->sc_cmd_tag;
747 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
749 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
750 struct tcm_loop_cmd, tl_se_cmd);
752 return tl_cmd->sc_cmd_state;
755 static int tcm_loop_shutdown_session(struct se_session *se_sess)
760 static void tcm_loop_close_session(struct se_session *se_sess)
765 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
768 * Since Linux/SCSI has already sent down a struct scsi_cmnd
769 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
770 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
771 * format with transport_generic_map_mem_to_cmd().
773 * We now tell TCM to add this WRITE CDB directly into the TCM storage
774 * object execution queue.
776 target_execute_cmd(se_cmd);
780 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
785 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
787 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
788 struct tcm_loop_cmd, tl_se_cmd);
789 struct scsi_cmnd *sc = tl_cmd->sc;
791 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
792 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
794 sc->result = SAM_STAT_GOOD;
795 set_host_byte(sc, DID_OK);
796 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
797 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
798 scsi_set_resid(sc, se_cmd->residual_count);
803 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
805 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
806 struct tcm_loop_cmd, tl_se_cmd);
807 struct scsi_cmnd *sc = tl_cmd->sc;
809 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
810 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
812 if (se_cmd->sense_buffer &&
813 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
814 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
816 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
817 SCSI_SENSE_BUFFERSIZE);
818 sc->result = SAM_STAT_CHECK_CONDITION;
819 set_driver_byte(sc, DRIVER_SENSE);
821 sc->result = se_cmd->scsi_status;
823 set_host_byte(sc, DID_OK);
824 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
825 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
826 scsi_set_resid(sc, se_cmd->residual_count);
831 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
833 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
834 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
836 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
837 * and wake up the wait_queue_head_t in tcm_loop_device_reset()
839 atomic_set(&tl_tmr->tmr_complete, 1);
840 wake_up(&tl_tmr->tl_tmr_wait);
843 static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
848 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
850 switch (tl_hba->tl_proto_id) {
851 case SCSI_PROTOCOL_SAS:
853 case SCSI_PROTOCOL_FCP:
855 case SCSI_PROTOCOL_ISCSI:
864 /* Start items for tcm_loop_port_cit */
866 static int tcm_loop_port_link(
867 struct se_portal_group *se_tpg,
870 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
871 struct tcm_loop_tpg, tl_se_tpg);
872 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
874 atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
876 * Add Linux/SCSI struct scsi_device by HCTL
878 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
880 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
884 static void tcm_loop_port_unlink(
885 struct se_portal_group *se_tpg,
886 struct se_lun *se_lun)
888 struct scsi_device *sd;
889 struct tcm_loop_hba *tl_hba;
890 struct tcm_loop_tpg *tl_tpg;
892 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
893 tl_hba = tl_tpg->tl_hba;
895 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
896 se_lun->unpacked_lun);
898 pr_err("Unable to locate struct scsi_device for %d:%d:"
899 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
903 * Remove Linux/SCSI struct scsi_device by HCTL
905 scsi_remove_device(sd);
908 atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
910 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
913 /* End items for tcm_loop_port_cit */
915 /* Start items for tcm_loop_nexus_cit */
917 static int tcm_loop_make_nexus(
918 struct tcm_loop_tpg *tl_tpg,
921 struct se_portal_group *se_tpg;
922 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
923 struct tcm_loop_nexus *tl_nexus;
926 if (tl_tpg->tl_nexus) {
927 pr_debug("tl_tpg->tl_nexus already exists\n");
930 se_tpg = &tl_tpg->tl_se_tpg;
932 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
934 pr_err("Unable to allocate struct tcm_loop_nexus\n");
938 * Initialize the struct se_session pointer
940 tl_nexus->se_sess = transport_init_session(TARGET_PROT_ALL);
941 if (IS_ERR(tl_nexus->se_sess)) {
942 ret = PTR_ERR(tl_nexus->se_sess);
946 * Since we are running in 'demo mode' this call with generate a
947 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
948 * Initiator port name of the passed configfs group 'name'.
950 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
951 se_tpg, (unsigned char *)name);
952 if (!tl_nexus->se_sess->se_node_acl) {
953 transport_free_session(tl_nexus->se_sess);
957 * Now, register the SAS I_T Nexus as active with the call to
958 * transport_register_session()
960 __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
961 tl_nexus->se_sess, tl_nexus);
962 tl_tpg->tl_nexus = tl_nexus;
963 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
964 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
973 static int tcm_loop_drop_nexus(
974 struct tcm_loop_tpg *tpg)
976 struct se_session *se_sess;
977 struct tcm_loop_nexus *tl_nexus;
979 tl_nexus = tpg->tl_nexus;
983 se_sess = tl_nexus->se_sess;
987 if (atomic_read(&tpg->tl_tpg_port_count)) {
988 pr_err("Unable to remove TCM_Loop I_T Nexus with"
989 " active TPG port count: %d\n",
990 atomic_read(&tpg->tl_tpg_port_count));
994 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
995 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba),
996 tl_nexus->se_sess->se_node_acl->initiatorname);
998 * Release the SCSI I_T Nexus to the emulated SAS Target Port
1000 transport_deregister_session(tl_nexus->se_sess);
1001 tpg->tl_nexus = NULL;
1006 /* End items for tcm_loop_nexus_cit */
1008 static ssize_t tcm_loop_tpg_show_nexus(
1009 struct se_portal_group *se_tpg,
1012 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1013 struct tcm_loop_tpg, tl_se_tpg);
1014 struct tcm_loop_nexus *tl_nexus;
1017 tl_nexus = tl_tpg->tl_nexus;
1021 ret = snprintf(page, PAGE_SIZE, "%s\n",
1022 tl_nexus->se_sess->se_node_acl->initiatorname);
1027 static ssize_t tcm_loop_tpg_store_nexus(
1028 struct se_portal_group *se_tpg,
1032 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1033 struct tcm_loop_tpg, tl_se_tpg);
1034 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1035 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
1038 * Shutdown the active I_T nexus if 'NULL' is passed..
1040 if (!strncmp(page, "NULL", 4)) {
1041 ret = tcm_loop_drop_nexus(tl_tpg);
1042 return (!ret) ? count : ret;
1045 * Otherwise make sure the passed virtual Initiator port WWN matches
1046 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
1047 * tcm_loop_make_nexus()
1049 if (strlen(page) >= TL_WWN_ADDR_LEN) {
1050 pr_err("Emulated NAA Sas Address: %s, exceeds"
1051 " max: %d\n", page, TL_WWN_ADDR_LEN);
1054 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
1056 ptr = strstr(i_port, "naa.");
1058 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
1059 pr_err("Passed SAS Initiator Port %s does not"
1060 " match target port protoid: %s\n", i_port,
1061 tcm_loop_dump_proto_id(tl_hba));
1064 port_ptr = &i_port[0];
1067 ptr = strstr(i_port, "fc.");
1069 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
1070 pr_err("Passed FCP Initiator Port %s does not"
1071 " match target port protoid: %s\n", i_port,
1072 tcm_loop_dump_proto_id(tl_hba));
1075 port_ptr = &i_port[3]; /* Skip over "fc." */
1078 ptr = strstr(i_port, "iqn.");
1080 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
1081 pr_err("Passed iSCSI Initiator Port %s does not"
1082 " match target port protoid: %s\n", i_port,
1083 tcm_loop_dump_proto_id(tl_hba));
1086 port_ptr = &i_port[0];
1089 pr_err("Unable to locate prefix for emulated Initiator Port:"
1093 * Clear any trailing newline for the NAA WWN
1096 if (i_port[strlen(i_port)-1] == '\n')
1097 i_port[strlen(i_port)-1] = '\0';
1099 ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
1106 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR);
1108 static ssize_t tcm_loop_tpg_show_transport_status(
1109 struct se_portal_group *se_tpg,
1112 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1113 struct tcm_loop_tpg, tl_se_tpg);
1114 const char *status = NULL;
1115 ssize_t ret = -EINVAL;
1117 switch (tl_tpg->tl_transport_status) {
1118 case TCM_TRANSPORT_ONLINE:
1121 case TCM_TRANSPORT_OFFLINE:
1129 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
1134 static ssize_t tcm_loop_tpg_store_transport_status(
1135 struct se_portal_group *se_tpg,
1139 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1140 struct tcm_loop_tpg, tl_se_tpg);
1142 if (!strncmp(page, "online", 6)) {
1143 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
1146 if (!strncmp(page, "offline", 7)) {
1147 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
1153 TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR);
1155 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1156 &tcm_loop_tpg_nexus.attr,
1157 &tcm_loop_tpg_transport_status.attr,
1161 /* Start items for tcm_loop_naa_cit */
1163 static struct se_portal_group *tcm_loop_make_naa_tpg(
1165 struct config_group *group,
1168 struct tcm_loop_hba *tl_hba = container_of(wwn,
1169 struct tcm_loop_hba, tl_hba_wwn);
1170 struct tcm_loop_tpg *tl_tpg;
1171 char *tpgt_str, *end_ptr;
1173 unsigned short int tpgt;
1175 tpgt_str = strstr(name, "tpgt_");
1177 pr_err("Unable to locate \"tpgt_#\" directory"
1179 return ERR_PTR(-EINVAL);
1181 tpgt_str += 5; /* Skip ahead of "tpgt_" */
1182 tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0);
1184 if (tpgt >= TL_TPGS_PER_HBA) {
1185 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1186 " %u\n", tpgt, TL_TPGS_PER_HBA);
1187 return ERR_PTR(-EINVAL);
1189 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1190 tl_tpg->tl_hba = tl_hba;
1191 tl_tpg->tl_tpgt = tpgt;
1193 * Register the tl_tpg as a emulated SAS TCM Target Endpoint
1195 ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops,
1196 wwn, &tl_tpg->tl_se_tpg, tl_tpg,
1197 TRANSPORT_TPG_TYPE_NORMAL);
1199 return ERR_PTR(-ENOMEM);
1201 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1202 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1203 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1205 return &tl_tpg->tl_se_tpg;
1208 static void tcm_loop_drop_naa_tpg(
1209 struct se_portal_group *se_tpg)
1211 struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1212 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1213 struct tcm_loop_tpg, tl_se_tpg);
1214 struct tcm_loop_hba *tl_hba;
1215 unsigned short tpgt;
1217 tl_hba = tl_tpg->tl_hba;
1218 tpgt = tl_tpg->tl_tpgt;
1220 * Release the I_T Nexus for the Virtual SAS link if present
1222 tcm_loop_drop_nexus(tl_tpg);
1224 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1226 core_tpg_deregister(se_tpg);
1228 tl_tpg->tl_hba = NULL;
1229 tl_tpg->tl_tpgt = 0;
1231 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1232 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1233 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1236 /* End items for tcm_loop_naa_cit */
1238 /* Start items for tcm_loop_cit */
1240 static struct se_wwn *tcm_loop_make_scsi_hba(
1241 struct target_fabric_configfs *tf,
1242 struct config_group *group,
1245 struct tcm_loop_hba *tl_hba;
1246 struct Scsi_Host *sh;
1250 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1252 pr_err("Unable to allocate struct tcm_loop_hba\n");
1253 return ERR_PTR(-ENOMEM);
1256 * Determine the emulated Protocol Identifier and Target Port Name
1257 * based on the incoming configfs directory name.
1259 ptr = strstr(name, "naa.");
1261 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1264 ptr = strstr(name, "fc.");
1266 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1267 off = 3; /* Skip over "fc." */
1270 ptr = strstr(name, "iqn.");
1272 pr_err("Unable to locate prefix for emulated Target "
1273 "Port: %s\n", name);
1277 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1280 if (strlen(name) >= TL_WWN_ADDR_LEN) {
1281 pr_err("Emulated NAA %s Address: %s, exceeds"
1282 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1287 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1290 * Call device_register(tl_hba->dev) to register the emulated
1291 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1292 * device_register() callbacks in tcm_loop_driver_probe()
1294 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1299 tcm_loop_hba_no_cnt++;
1300 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1301 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1302 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1304 return &tl_hba->tl_hba_wwn;
1307 return ERR_PTR(ret);
1310 static void tcm_loop_drop_scsi_hba(
1313 struct tcm_loop_hba *tl_hba = container_of(wwn,
1314 struct tcm_loop_hba, tl_hba_wwn);
1316 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1317 " SAS Address: %s at Linux/SCSI Host ID: %d\n",
1318 tl_hba->tl_wwn_address, tl_hba->sh->host_no);
1320 * Call device_unregister() on the original tl_hba->dev.
1321 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1324 device_unregister(&tl_hba->dev);
1327 /* Start items for tcm_loop_cit */
1328 static ssize_t tcm_loop_wwn_show_attr_version(
1329 struct target_fabric_configfs *tf,
1332 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1335 TF_WWN_ATTR_RO(tcm_loop, version);
1337 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1338 &tcm_loop_wwn_version.attr,
1342 /* End items for tcm_loop_cit */
1344 static int tcm_loop_register_configfs(void)
1346 struct target_fabric_configfs *fabric;
1349 * Set the TCM Loop HBA counter to zero
1351 tcm_loop_hba_no_cnt = 0;
1353 * Register the top level struct config_item_type with TCM core
1355 fabric = target_fabric_configfs_init(THIS_MODULE, "loopback");
1356 if (IS_ERR(fabric)) {
1357 pr_err("tcm_loop_register_configfs() failed!\n");
1358 return PTR_ERR(fabric);
1361 * Setup the fabric API of function pointers used by target_core_mod
1363 fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name;
1364 fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident;
1365 fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn;
1366 fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag;
1367 fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth;
1368 fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id;
1369 fabric->tf_ops.tpg_get_pr_transport_id_len =
1370 &tcm_loop_get_pr_transport_id_len;
1371 fabric->tf_ops.tpg_parse_pr_out_transport_id =
1372 &tcm_loop_parse_pr_out_transport_id;
1373 fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode;
1374 fabric->tf_ops.tpg_check_demo_mode_cache =
1375 &tcm_loop_check_demo_mode_cache;
1376 fabric->tf_ops.tpg_check_demo_mode_write_protect =
1377 &tcm_loop_check_demo_mode_write_protect;
1378 fabric->tf_ops.tpg_check_prod_mode_write_protect =
1379 &tcm_loop_check_prod_mode_write_protect;
1381 * The TCM loopback fabric module runs in demo-mode to a local
1382 * virtual SCSI device, so fabric dependent initator ACLs are
1385 fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl;
1386 fabric->tf_ops.tpg_release_fabric_acl =
1387 &tcm_loop_tpg_release_fabric_acl;
1388 fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index;
1390 * Used for setting up remaining TCM resources in process context
1392 fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free;
1393 fabric->tf_ops.release_cmd = &tcm_loop_release_cmd;
1394 fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session;
1395 fabric->tf_ops.close_session = &tcm_loop_close_session;
1396 fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index;
1397 fabric->tf_ops.sess_get_initiator_sid = NULL;
1398 fabric->tf_ops.write_pending = &tcm_loop_write_pending;
1399 fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status;
1401 * Not used for TCM loopback
1403 fabric->tf_ops.set_default_node_attributes =
1404 &tcm_loop_set_default_node_attributes;
1405 fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag;
1406 fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state;
1407 fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in;
1408 fabric->tf_ops.queue_status = &tcm_loop_queue_status;
1409 fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp;
1410 fabric->tf_ops.aborted_task = &tcm_loop_aborted_task;
1413 * Setup function pointers for generic logic in target_core_fabric_configfs.c
1415 fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba;
1416 fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba;
1417 fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg;
1418 fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg;
1420 * fabric_post_link() and fabric_pre_unlink() are used for
1421 * registration and release of TCM Loop Virtual SCSI LUNs.
1423 fabric->tf_ops.fabric_post_link = &tcm_loop_port_link;
1424 fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink;
1425 fabric->tf_ops.fabric_make_np = NULL;
1426 fabric->tf_ops.fabric_drop_np = NULL;
1428 * Setup default attribute lists for various fabric->tf_cit_tmpl
1430 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs;
1431 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs;
1432 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
1433 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
1434 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
1436 * Once fabric->tf_ops has been setup, now register the fabric for
1439 ret = target_fabric_configfs_register(fabric);
1441 pr_err("target_fabric_configfs_register() for"
1442 " TCM_Loop failed!\n");
1443 target_fabric_configfs_free(fabric);
1447 * Setup our local pointer to *fabric.
1449 tcm_loop_fabric_configfs = fabric;
1450 pr_debug("TCM_LOOP[0] - Set fabric ->"
1451 " tcm_loop_fabric_configfs\n");
1455 static void tcm_loop_deregister_configfs(void)
1457 if (!tcm_loop_fabric_configfs)
1460 target_fabric_configfs_deregister(tcm_loop_fabric_configfs);
1461 tcm_loop_fabric_configfs = NULL;
1462 pr_debug("TCM_LOOP[0] - Cleared"
1463 " tcm_loop_fabric_configfs\n");
1466 static int __init tcm_loop_fabric_init(void)
1470 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1471 if (!tcm_loop_workqueue)
1474 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1475 sizeof(struct tcm_loop_cmd),
1476 __alignof__(struct tcm_loop_cmd),
1478 if (!tcm_loop_cmd_cache) {
1479 pr_debug("kmem_cache_create() for"
1480 " tcm_loop_cmd_cache failed\n");
1481 goto out_destroy_workqueue;
1484 ret = tcm_loop_alloc_core_bus();
1486 goto out_destroy_cache;
1488 ret = tcm_loop_register_configfs();
1490 goto out_release_core_bus;
1494 out_release_core_bus:
1495 tcm_loop_release_core_bus();
1497 kmem_cache_destroy(tcm_loop_cmd_cache);
1498 out_destroy_workqueue:
1499 destroy_workqueue(tcm_loop_workqueue);
1504 static void __exit tcm_loop_fabric_exit(void)
1506 tcm_loop_deregister_configfs();
1507 tcm_loop_release_core_bus();
1508 kmem_cache_destroy(tcm_loop_cmd_cache);
1509 destroy_workqueue(tcm_loop_workqueue);
1512 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1513 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1514 MODULE_LICENSE("GPL");
1515 module_init(tcm_loop_fabric_init);
1516 module_exit(tcm_loop_fabric_exit);