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_hba->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, MSG_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 struct tcm_loop_nexus *tl_nexus,
222 int lun, int task, enum tcm_tmreq_table tmr)
224 struct se_cmd *se_cmd = NULL;
225 struct se_session *se_sess;
226 struct se_portal_group *se_tpg;
227 struct tcm_loop_cmd *tl_cmd = NULL;
228 struct tcm_loop_tmr *tl_tmr = NULL;
229 int ret = TMR_FUNCTION_FAILED, rc;
231 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
233 pr_err("Unable to allocate memory for tl_cmd\n");
237 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
239 pr_err("Unable to allocate memory for tl_tmr\n");
242 init_waitqueue_head(&tl_tmr->tl_tmr_wait);
244 se_cmd = &tl_cmd->tl_se_cmd;
245 se_tpg = &tl_tpg->tl_se_tpg;
246 se_sess = tl_nexus->se_sess;
248 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
250 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
251 DMA_NONE, MSG_SIMPLE_TAG,
252 &tl_cmd->tl_sense_buf[0]);
254 rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL);
258 if (tmr == TMR_ABORT_TASK)
259 se_cmd->se_tmr_req->ref_task_tag = task;
262 * Locate the underlying TCM struct se_lun
264 if (transport_lookup_tmr_lun(se_cmd, lun) < 0) {
265 ret = TMR_LUN_DOES_NOT_EXIST;
269 * Queue the TMR to TCM Core and sleep waiting for
270 * tcm_loop_queue_tm_rsp() to wake us up.
272 transport_generic_handle_tmr(se_cmd);
273 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
275 * The TMR LUN_RESET has completed, check the response status and
276 * then release allocations.
278 ret = se_cmd->se_tmr_req->response;
281 transport_generic_free_cmd(se_cmd, 1);
283 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
288 static int tcm_loop_abort_task(struct scsi_cmnd *sc)
290 struct tcm_loop_hba *tl_hba;
291 struct tcm_loop_nexus *tl_nexus;
292 struct tcm_loop_tpg *tl_tpg;
296 * Locate the tcm_loop_hba_t pointer
298 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
300 * Locate the tl_nexus and se_sess pointers
302 tl_nexus = tl_hba->tl_nexus;
304 pr_err("Unable to perform device reset without"
305 " active I_T Nexus\n");
310 * Locate the tl_tpg pointer from TargetID in sc->device->id
312 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
313 ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun,
314 sc->request->tag, TMR_ABORT_TASK);
315 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
319 * Called from SCSI EH process context to issue a LUN_RESET TMR
320 * to struct scsi_device
322 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
324 struct tcm_loop_hba *tl_hba;
325 struct tcm_loop_nexus *tl_nexus;
326 struct tcm_loop_tpg *tl_tpg;
330 * Locate the tcm_loop_hba_t pointer
332 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
334 * Locate the tl_nexus and se_sess pointers
336 tl_nexus = tl_hba->tl_nexus;
338 pr_err("Unable to perform device reset without"
339 " active I_T Nexus\n");
343 * Locate the tl_tpg pointer from TargetID in sc->device->id
345 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
346 ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun,
348 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
351 static int tcm_loop_target_reset(struct scsi_cmnd *sc)
353 struct tcm_loop_hba *tl_hba;
354 struct tcm_loop_tpg *tl_tpg;
357 * Locate the tcm_loop_hba_t pointer
359 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
361 pr_err("Unable to perform device reset without"
362 " active I_T Nexus\n");
366 * Locate the tl_tpg pointer from TargetID in sc->device->id
368 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
370 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
376 static int tcm_loop_slave_alloc(struct scsi_device *sd)
378 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
382 static struct scsi_host_template tcm_loop_driver_template = {
383 .show_info = tcm_loop_show_info,
384 .proc_name = "tcm_loopback",
385 .name = "TCM_Loopback",
386 .queuecommand = tcm_loop_queuecommand,
387 .change_queue_depth = scsi_change_queue_depth,
388 .change_queue_type = scsi_change_queue_type,
389 .eh_abort_handler = tcm_loop_abort_task,
390 .eh_device_reset_handler = tcm_loop_device_reset,
391 .eh_target_reset_handler = tcm_loop_target_reset,
396 .max_sectors = 0xFFFF,
397 .use_clustering = DISABLE_CLUSTERING,
398 .slave_alloc = tcm_loop_slave_alloc,
399 .module = THIS_MODULE,
401 .track_queue_depth = 1,
404 static int tcm_loop_driver_probe(struct device *dev)
406 struct tcm_loop_hba *tl_hba;
407 struct Scsi_Host *sh;
408 int error, host_prot;
410 tl_hba = to_tcm_loop_hba(dev);
412 sh = scsi_host_alloc(&tcm_loop_driver_template,
413 sizeof(struct tcm_loop_hba));
415 pr_err("Unable to allocate struct scsi_host\n");
421 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
423 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
425 * Setup single ID, Channel and LUN for now..
430 sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN;
432 host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
433 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
434 SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
436 scsi_host_set_prot(sh, host_prot);
437 scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
439 error = scsi_add_host(sh, &tl_hba->dev);
441 pr_err("%s: scsi_add_host failed\n", __func__);
448 static int tcm_loop_driver_remove(struct device *dev)
450 struct tcm_loop_hba *tl_hba;
451 struct Scsi_Host *sh;
453 tl_hba = to_tcm_loop_hba(dev);
456 scsi_remove_host(sh);
461 static void tcm_loop_release_adapter(struct device *dev)
463 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
469 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
471 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
475 tl_hba->dev.bus = &tcm_loop_lld_bus;
476 tl_hba->dev.parent = tcm_loop_primary;
477 tl_hba->dev.release = &tcm_loop_release_adapter;
478 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
480 ret = device_register(&tl_hba->dev);
482 pr_err("device_register() failed for"
483 " tl_hba->dev: %d\n", ret);
491 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
494 static int tcm_loop_alloc_core_bus(void)
498 tcm_loop_primary = root_device_register("tcm_loop_0");
499 if (IS_ERR(tcm_loop_primary)) {
500 pr_err("Unable to allocate tcm_loop_primary\n");
501 return PTR_ERR(tcm_loop_primary);
504 ret = bus_register(&tcm_loop_lld_bus);
506 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
510 ret = driver_register(&tcm_loop_driverfs);
512 pr_err("driver_register() failed for"
513 "tcm_loop_driverfs\n");
517 pr_debug("Initialized TCM Loop Core Bus\n");
521 bus_unregister(&tcm_loop_lld_bus);
523 root_device_unregister(tcm_loop_primary);
527 static void tcm_loop_release_core_bus(void)
529 driver_unregister(&tcm_loop_driverfs);
530 bus_unregister(&tcm_loop_lld_bus);
531 root_device_unregister(tcm_loop_primary);
533 pr_debug("Releasing TCM Loop Core BUS\n");
536 static char *tcm_loop_get_fabric_name(void)
541 static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg)
543 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
544 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
546 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
547 * time based on the protocol dependent prefix of the passed configfs group.
549 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric
550 * ProtocolID using target_core_fabric_lib.c symbols.
552 switch (tl_hba->tl_proto_id) {
553 case SCSI_PROTOCOL_SAS:
554 return sas_get_fabric_proto_ident(se_tpg);
555 case SCSI_PROTOCOL_FCP:
556 return fc_get_fabric_proto_ident(se_tpg);
557 case SCSI_PROTOCOL_ISCSI:
558 return iscsi_get_fabric_proto_ident(se_tpg);
560 pr_err("Unknown tl_proto_id: 0x%02x, using"
561 " SAS emulation\n", tl_hba->tl_proto_id);
565 return sas_get_fabric_proto_ident(se_tpg);
568 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
570 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
572 * Return the passed NAA identifier for the SAS Target Port
574 return &tl_tpg->tl_hba->tl_wwn_address[0];
577 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
579 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
581 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
582 * to represent the SCSI Target Port.
584 return tl_tpg->tl_tpgt;
587 static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg)
592 static u32 tcm_loop_get_pr_transport_id(
593 struct se_portal_group *se_tpg,
594 struct se_node_acl *se_nacl,
595 struct t10_pr_registration *pr_reg,
599 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
600 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
602 switch (tl_hba->tl_proto_id) {
603 case SCSI_PROTOCOL_SAS:
604 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
606 case SCSI_PROTOCOL_FCP:
607 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
609 case SCSI_PROTOCOL_ISCSI:
610 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
613 pr_err("Unknown tl_proto_id: 0x%02x, using"
614 " SAS emulation\n", tl_hba->tl_proto_id);
618 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
622 static u32 tcm_loop_get_pr_transport_id_len(
623 struct se_portal_group *se_tpg,
624 struct se_node_acl *se_nacl,
625 struct t10_pr_registration *pr_reg,
628 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
629 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
631 switch (tl_hba->tl_proto_id) {
632 case SCSI_PROTOCOL_SAS:
633 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
635 case SCSI_PROTOCOL_FCP:
636 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
638 case SCSI_PROTOCOL_ISCSI:
639 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
642 pr_err("Unknown tl_proto_id: 0x%02x, using"
643 " SAS emulation\n", tl_hba->tl_proto_id);
647 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
652 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
653 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
655 static char *tcm_loop_parse_pr_out_transport_id(
656 struct se_portal_group *se_tpg,
659 char **port_nexus_ptr)
661 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
662 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
664 switch (tl_hba->tl_proto_id) {
665 case SCSI_PROTOCOL_SAS:
666 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
668 case SCSI_PROTOCOL_FCP:
669 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
671 case SCSI_PROTOCOL_ISCSI:
672 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
675 pr_err("Unknown tl_proto_id: 0x%02x, using"
676 " SAS emulation\n", tl_hba->tl_proto_id);
680 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
685 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
686 * based upon the incoming fabric dependent SCSI Initiator Port
688 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
693 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
699 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
700 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
702 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
708 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
709 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
710 * It has been added here as a nop for target_fabric_tf_ops_check()
712 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
717 static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl(
718 struct se_portal_group *se_tpg)
720 struct tcm_loop_nacl *tl_nacl;
722 tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL);
724 pr_err("Unable to allocate struct tcm_loop_nacl\n");
728 return &tl_nacl->se_node_acl;
731 static void tcm_loop_tpg_release_fabric_acl(
732 struct se_portal_group *se_tpg,
733 struct se_node_acl *se_nacl)
735 struct tcm_loop_nacl *tl_nacl = container_of(se_nacl,
736 struct tcm_loop_nacl, se_node_acl);
741 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
746 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
751 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
756 static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
758 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
759 struct tcm_loop_cmd, tl_se_cmd);
761 return tl_cmd->sc_cmd_tag;
764 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
766 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
767 struct tcm_loop_cmd, tl_se_cmd);
769 return tl_cmd->sc_cmd_state;
772 static int tcm_loop_shutdown_session(struct se_session *se_sess)
777 static void tcm_loop_close_session(struct se_session *se_sess)
782 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
785 * Since Linux/SCSI has already sent down a struct scsi_cmnd
786 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
787 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
788 * format with transport_generic_map_mem_to_cmd().
790 * We now tell TCM to add this WRITE CDB directly into the TCM storage
791 * object execution queue.
793 target_execute_cmd(se_cmd);
797 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
802 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
804 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
805 struct tcm_loop_cmd, tl_se_cmd);
806 struct scsi_cmnd *sc = tl_cmd->sc;
808 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
809 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
811 sc->result = SAM_STAT_GOOD;
812 set_host_byte(sc, DID_OK);
813 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
814 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
815 scsi_set_resid(sc, se_cmd->residual_count);
820 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
822 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
823 struct tcm_loop_cmd, tl_se_cmd);
824 struct scsi_cmnd *sc = tl_cmd->sc;
826 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
827 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
829 if (se_cmd->sense_buffer &&
830 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
831 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
833 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
834 SCSI_SENSE_BUFFERSIZE);
835 sc->result = SAM_STAT_CHECK_CONDITION;
836 set_driver_byte(sc, DRIVER_SENSE);
838 sc->result = se_cmd->scsi_status;
840 set_host_byte(sc, DID_OK);
841 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
842 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
843 scsi_set_resid(sc, se_cmd->residual_count);
848 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
850 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
851 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
853 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
854 * and wake up the wait_queue_head_t in tcm_loop_device_reset()
856 atomic_set(&tl_tmr->tmr_complete, 1);
857 wake_up(&tl_tmr->tl_tmr_wait);
860 static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
865 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
867 switch (tl_hba->tl_proto_id) {
868 case SCSI_PROTOCOL_SAS:
870 case SCSI_PROTOCOL_FCP:
872 case SCSI_PROTOCOL_ISCSI:
881 /* Start items for tcm_loop_port_cit */
883 static int tcm_loop_port_link(
884 struct se_portal_group *se_tpg,
887 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
888 struct tcm_loop_tpg, tl_se_tpg);
889 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
891 atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
893 * Add Linux/SCSI struct scsi_device by HCTL
895 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
897 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
901 static void tcm_loop_port_unlink(
902 struct se_portal_group *se_tpg,
903 struct se_lun *se_lun)
905 struct scsi_device *sd;
906 struct tcm_loop_hba *tl_hba;
907 struct tcm_loop_tpg *tl_tpg;
909 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
910 tl_hba = tl_tpg->tl_hba;
912 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
913 se_lun->unpacked_lun);
915 pr_err("Unable to locate struct scsi_device for %d:%d:"
916 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
920 * Remove Linux/SCSI struct scsi_device by HCTL
922 scsi_remove_device(sd);
925 atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
927 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
930 /* End items for tcm_loop_port_cit */
932 /* Start items for tcm_loop_nexus_cit */
934 static int tcm_loop_make_nexus(
935 struct tcm_loop_tpg *tl_tpg,
938 struct se_portal_group *se_tpg;
939 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
940 struct tcm_loop_nexus *tl_nexus;
943 if (tl_tpg->tl_hba->tl_nexus) {
944 pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n");
947 se_tpg = &tl_tpg->tl_se_tpg;
949 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
951 pr_err("Unable to allocate struct tcm_loop_nexus\n");
955 * Initialize the struct se_session pointer
957 tl_nexus->se_sess = transport_init_session(TARGET_PROT_ALL);
958 if (IS_ERR(tl_nexus->se_sess)) {
959 ret = PTR_ERR(tl_nexus->se_sess);
963 * Since we are running in 'demo mode' this call with generate a
964 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
965 * Initiator port name of the passed configfs group 'name'.
967 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
968 se_tpg, (unsigned char *)name);
969 if (!tl_nexus->se_sess->se_node_acl) {
970 transport_free_session(tl_nexus->se_sess);
974 * Now, register the SAS I_T Nexus as active with the call to
975 * transport_register_session()
977 __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
978 tl_nexus->se_sess, tl_nexus);
979 tl_tpg->tl_hba->tl_nexus = tl_nexus;
980 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
981 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
990 static int tcm_loop_drop_nexus(
991 struct tcm_loop_tpg *tpg)
993 struct se_session *se_sess;
994 struct tcm_loop_nexus *tl_nexus;
995 struct tcm_loop_hba *tl_hba = tpg->tl_hba;
1000 tl_nexus = tl_hba->tl_nexus;
1004 se_sess = tl_nexus->se_sess;
1008 if (atomic_read(&tpg->tl_tpg_port_count)) {
1009 pr_err("Unable to remove TCM_Loop I_T Nexus with"
1010 " active TPG port count: %d\n",
1011 atomic_read(&tpg->tl_tpg_port_count));
1015 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
1016 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1017 tl_nexus->se_sess->se_node_acl->initiatorname);
1019 * Release the SCSI I_T Nexus to the emulated SAS Target Port
1021 transport_deregister_session(tl_nexus->se_sess);
1022 tpg->tl_hba->tl_nexus = NULL;
1027 /* End items for tcm_loop_nexus_cit */
1029 static ssize_t tcm_loop_tpg_show_nexus(
1030 struct se_portal_group *se_tpg,
1033 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1034 struct tcm_loop_tpg, tl_se_tpg);
1035 struct tcm_loop_nexus *tl_nexus;
1038 tl_nexus = tl_tpg->tl_hba->tl_nexus;
1042 ret = snprintf(page, PAGE_SIZE, "%s\n",
1043 tl_nexus->se_sess->se_node_acl->initiatorname);
1048 static ssize_t tcm_loop_tpg_store_nexus(
1049 struct se_portal_group *se_tpg,
1053 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1054 struct tcm_loop_tpg, tl_se_tpg);
1055 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1056 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
1059 * Shutdown the active I_T nexus if 'NULL' is passed..
1061 if (!strncmp(page, "NULL", 4)) {
1062 ret = tcm_loop_drop_nexus(tl_tpg);
1063 return (!ret) ? count : ret;
1066 * Otherwise make sure the passed virtual Initiator port WWN matches
1067 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
1068 * tcm_loop_make_nexus()
1070 if (strlen(page) >= TL_WWN_ADDR_LEN) {
1071 pr_err("Emulated NAA Sas Address: %s, exceeds"
1072 " max: %d\n", page, TL_WWN_ADDR_LEN);
1075 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
1077 ptr = strstr(i_port, "naa.");
1079 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
1080 pr_err("Passed SAS Initiator Port %s does not"
1081 " match target port protoid: %s\n", i_port,
1082 tcm_loop_dump_proto_id(tl_hba));
1085 port_ptr = &i_port[0];
1088 ptr = strstr(i_port, "fc.");
1090 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
1091 pr_err("Passed FCP Initiator Port %s does not"
1092 " match target port protoid: %s\n", i_port,
1093 tcm_loop_dump_proto_id(tl_hba));
1096 port_ptr = &i_port[3]; /* Skip over "fc." */
1099 ptr = strstr(i_port, "iqn.");
1101 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
1102 pr_err("Passed iSCSI Initiator Port %s does not"
1103 " match target port protoid: %s\n", i_port,
1104 tcm_loop_dump_proto_id(tl_hba));
1107 port_ptr = &i_port[0];
1110 pr_err("Unable to locate prefix for emulated Initiator Port:"
1114 * Clear any trailing newline for the NAA WWN
1117 if (i_port[strlen(i_port)-1] == '\n')
1118 i_port[strlen(i_port)-1] = '\0';
1120 ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
1127 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR);
1129 static ssize_t tcm_loop_tpg_show_transport_status(
1130 struct se_portal_group *se_tpg,
1133 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1134 struct tcm_loop_tpg, tl_se_tpg);
1135 const char *status = NULL;
1136 ssize_t ret = -EINVAL;
1138 switch (tl_tpg->tl_transport_status) {
1139 case TCM_TRANSPORT_ONLINE:
1142 case TCM_TRANSPORT_OFFLINE:
1150 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
1155 static ssize_t tcm_loop_tpg_store_transport_status(
1156 struct se_portal_group *se_tpg,
1160 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1161 struct tcm_loop_tpg, tl_se_tpg);
1163 if (!strncmp(page, "online", 6)) {
1164 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
1167 if (!strncmp(page, "offline", 7)) {
1168 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
1174 TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR);
1176 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1177 &tcm_loop_tpg_nexus.attr,
1178 &tcm_loop_tpg_transport_status.attr,
1182 /* Start items for tcm_loop_naa_cit */
1184 static struct se_portal_group *tcm_loop_make_naa_tpg(
1186 struct config_group *group,
1189 struct tcm_loop_hba *tl_hba = container_of(wwn,
1190 struct tcm_loop_hba, tl_hba_wwn);
1191 struct tcm_loop_tpg *tl_tpg;
1192 char *tpgt_str, *end_ptr;
1194 unsigned short int tpgt;
1196 tpgt_str = strstr(name, "tpgt_");
1198 pr_err("Unable to locate \"tpgt_#\" directory"
1200 return ERR_PTR(-EINVAL);
1202 tpgt_str += 5; /* Skip ahead of "tpgt_" */
1203 tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0);
1205 if (tpgt >= TL_TPGS_PER_HBA) {
1206 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1207 " %u\n", tpgt, TL_TPGS_PER_HBA);
1208 return ERR_PTR(-EINVAL);
1210 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1211 tl_tpg->tl_hba = tl_hba;
1212 tl_tpg->tl_tpgt = tpgt;
1214 * Register the tl_tpg as a emulated SAS TCM Target Endpoint
1216 ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops,
1217 wwn, &tl_tpg->tl_se_tpg, tl_tpg,
1218 TRANSPORT_TPG_TYPE_NORMAL);
1220 return ERR_PTR(-ENOMEM);
1222 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1223 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1224 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1226 return &tl_tpg->tl_se_tpg;
1229 static void tcm_loop_drop_naa_tpg(
1230 struct se_portal_group *se_tpg)
1232 struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1233 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1234 struct tcm_loop_tpg, tl_se_tpg);
1235 struct tcm_loop_hba *tl_hba;
1236 unsigned short tpgt;
1238 tl_hba = tl_tpg->tl_hba;
1239 tpgt = tl_tpg->tl_tpgt;
1241 * Release the I_T Nexus for the Virtual SAS link if present
1243 tcm_loop_drop_nexus(tl_tpg);
1245 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1247 core_tpg_deregister(se_tpg);
1249 tl_tpg->tl_hba = NULL;
1250 tl_tpg->tl_tpgt = 0;
1252 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1253 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1254 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1257 /* End items for tcm_loop_naa_cit */
1259 /* Start items for tcm_loop_cit */
1261 static struct se_wwn *tcm_loop_make_scsi_hba(
1262 struct target_fabric_configfs *tf,
1263 struct config_group *group,
1266 struct tcm_loop_hba *tl_hba;
1267 struct Scsi_Host *sh;
1271 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1273 pr_err("Unable to allocate struct tcm_loop_hba\n");
1274 return ERR_PTR(-ENOMEM);
1277 * Determine the emulated Protocol Identifier and Target Port Name
1278 * based on the incoming configfs directory name.
1280 ptr = strstr(name, "naa.");
1282 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1285 ptr = strstr(name, "fc.");
1287 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1288 off = 3; /* Skip over "fc." */
1291 ptr = strstr(name, "iqn.");
1293 pr_err("Unable to locate prefix for emulated Target "
1294 "Port: %s\n", name);
1298 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1301 if (strlen(name) >= TL_WWN_ADDR_LEN) {
1302 pr_err("Emulated NAA %s Address: %s, exceeds"
1303 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1308 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1311 * Call device_register(tl_hba->dev) to register the emulated
1312 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1313 * device_register() callbacks in tcm_loop_driver_probe()
1315 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1320 tcm_loop_hba_no_cnt++;
1321 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1322 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1323 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1325 return &tl_hba->tl_hba_wwn;
1328 return ERR_PTR(ret);
1331 static void tcm_loop_drop_scsi_hba(
1334 struct tcm_loop_hba *tl_hba = container_of(wwn,
1335 struct tcm_loop_hba, tl_hba_wwn);
1337 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1338 " SAS Address: %s at Linux/SCSI Host ID: %d\n",
1339 tl_hba->tl_wwn_address, tl_hba->sh->host_no);
1341 * Call device_unregister() on the original tl_hba->dev.
1342 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1345 device_unregister(&tl_hba->dev);
1348 /* Start items for tcm_loop_cit */
1349 static ssize_t tcm_loop_wwn_show_attr_version(
1350 struct target_fabric_configfs *tf,
1353 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1356 TF_WWN_ATTR_RO(tcm_loop, version);
1358 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1359 &tcm_loop_wwn_version.attr,
1363 /* End items for tcm_loop_cit */
1365 static int tcm_loop_register_configfs(void)
1367 struct target_fabric_configfs *fabric;
1370 * Set the TCM Loop HBA counter to zero
1372 tcm_loop_hba_no_cnt = 0;
1374 * Register the top level struct config_item_type with TCM core
1376 fabric = target_fabric_configfs_init(THIS_MODULE, "loopback");
1377 if (IS_ERR(fabric)) {
1378 pr_err("tcm_loop_register_configfs() failed!\n");
1379 return PTR_ERR(fabric);
1382 * Setup the fabric API of function pointers used by target_core_mod
1384 fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name;
1385 fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident;
1386 fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn;
1387 fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag;
1388 fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth;
1389 fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id;
1390 fabric->tf_ops.tpg_get_pr_transport_id_len =
1391 &tcm_loop_get_pr_transport_id_len;
1392 fabric->tf_ops.tpg_parse_pr_out_transport_id =
1393 &tcm_loop_parse_pr_out_transport_id;
1394 fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode;
1395 fabric->tf_ops.tpg_check_demo_mode_cache =
1396 &tcm_loop_check_demo_mode_cache;
1397 fabric->tf_ops.tpg_check_demo_mode_write_protect =
1398 &tcm_loop_check_demo_mode_write_protect;
1399 fabric->tf_ops.tpg_check_prod_mode_write_protect =
1400 &tcm_loop_check_prod_mode_write_protect;
1402 * The TCM loopback fabric module runs in demo-mode to a local
1403 * virtual SCSI device, so fabric dependent initator ACLs are
1406 fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl;
1407 fabric->tf_ops.tpg_release_fabric_acl =
1408 &tcm_loop_tpg_release_fabric_acl;
1409 fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index;
1411 * Used for setting up remaining TCM resources in process context
1413 fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free;
1414 fabric->tf_ops.release_cmd = &tcm_loop_release_cmd;
1415 fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session;
1416 fabric->tf_ops.close_session = &tcm_loop_close_session;
1417 fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index;
1418 fabric->tf_ops.sess_get_initiator_sid = NULL;
1419 fabric->tf_ops.write_pending = &tcm_loop_write_pending;
1420 fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status;
1422 * Not used for TCM loopback
1424 fabric->tf_ops.set_default_node_attributes =
1425 &tcm_loop_set_default_node_attributes;
1426 fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag;
1427 fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state;
1428 fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in;
1429 fabric->tf_ops.queue_status = &tcm_loop_queue_status;
1430 fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp;
1431 fabric->tf_ops.aborted_task = &tcm_loop_aborted_task;
1434 * Setup function pointers for generic logic in target_core_fabric_configfs.c
1436 fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba;
1437 fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba;
1438 fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg;
1439 fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg;
1441 * fabric_post_link() and fabric_pre_unlink() are used for
1442 * registration and release of TCM Loop Virtual SCSI LUNs.
1444 fabric->tf_ops.fabric_post_link = &tcm_loop_port_link;
1445 fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink;
1446 fabric->tf_ops.fabric_make_np = NULL;
1447 fabric->tf_ops.fabric_drop_np = NULL;
1449 * Setup default attribute lists for various fabric->tf_cit_tmpl
1451 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs;
1452 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs;
1453 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
1454 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
1455 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
1457 * Once fabric->tf_ops has been setup, now register the fabric for
1460 ret = target_fabric_configfs_register(fabric);
1462 pr_err("target_fabric_configfs_register() for"
1463 " TCM_Loop failed!\n");
1464 target_fabric_configfs_free(fabric);
1468 * Setup our local pointer to *fabric.
1470 tcm_loop_fabric_configfs = fabric;
1471 pr_debug("TCM_LOOP[0] - Set fabric ->"
1472 " tcm_loop_fabric_configfs\n");
1476 static void tcm_loop_deregister_configfs(void)
1478 if (!tcm_loop_fabric_configfs)
1481 target_fabric_configfs_deregister(tcm_loop_fabric_configfs);
1482 tcm_loop_fabric_configfs = NULL;
1483 pr_debug("TCM_LOOP[0] - Cleared"
1484 " tcm_loop_fabric_configfs\n");
1487 static int __init tcm_loop_fabric_init(void)
1491 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1492 if (!tcm_loop_workqueue)
1495 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1496 sizeof(struct tcm_loop_cmd),
1497 __alignof__(struct tcm_loop_cmd),
1499 if (!tcm_loop_cmd_cache) {
1500 pr_debug("kmem_cache_create() for"
1501 " tcm_loop_cmd_cache failed\n");
1502 goto out_destroy_workqueue;
1505 ret = tcm_loop_alloc_core_bus();
1507 goto out_destroy_cache;
1509 ret = tcm_loop_register_configfs();
1511 goto out_release_core_bus;
1515 out_release_core_bus:
1516 tcm_loop_release_core_bus();
1518 kmem_cache_destroy(tcm_loop_cmd_cache);
1519 out_destroy_workqueue:
1520 destroy_workqueue(tcm_loop_workqueue);
1525 static void __exit tcm_loop_fabric_exit(void)
1527 tcm_loop_deregister_configfs();
1528 tcm_loop_release_core_bus();
1529 kmem_cache_destroy(tcm_loop_cmd_cache);
1530 destroy_workqueue(tcm_loop_workqueue);
1533 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1534 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1535 MODULE_LICENSE("GPL");
1536 module_init(tcm_loop_fabric_init);
1537 module_exit(tcm_loop_fabric_exit);