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,
123 case SCSI_QDEPTH_DEFAULT:
124 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
126 case SCSI_QDEPTH_QFULL:
127 scsi_track_queue_full(sdev, depth);
129 case SCSI_QDEPTH_RAMP_UP:
130 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
135 return sdev->queue_depth;
138 static int tcm_loop_change_queue_type(struct scsi_device *sdev, int tag)
140 if (sdev->tagged_supported) {
141 scsi_set_tag_type(sdev, tag);
144 scsi_activate_tcq(sdev, sdev->queue_depth);
146 scsi_deactivate_tcq(sdev, sdev->queue_depth);
154 * Locate the SAM Task Attr from struct scsi_cmnd *
156 static int tcm_loop_sam_attr(struct scsi_cmnd *sc)
158 if (sc->device->tagged_supported) {
160 case HEAD_OF_QUEUE_TAG:
162 case ORDERED_QUEUE_TAG:
163 return MSG_ORDERED_TAG;
169 return MSG_SIMPLE_TAG;
172 static void tcm_loop_submission_work(struct work_struct *work)
174 struct tcm_loop_cmd *tl_cmd =
175 container_of(work, struct tcm_loop_cmd, work);
176 struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
177 struct scsi_cmnd *sc = tl_cmd->sc;
178 struct tcm_loop_nexus *tl_nexus;
179 struct tcm_loop_hba *tl_hba;
180 struct tcm_loop_tpg *tl_tpg;
181 struct scatterlist *sgl_bidi = NULL;
182 u32 sgl_bidi_count = 0;
185 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
186 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
189 * Ensure that this tl_tpg reference from the incoming sc->device->id
190 * has already been configured via tcm_loop_make_naa_tpg().
192 if (!tl_tpg->tl_hba) {
193 set_host_byte(sc, DID_NO_CONNECT);
196 if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
197 set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
200 tl_nexus = tl_hba->tl_nexus;
202 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
203 " does not exist\n");
204 set_host_byte(sc, DID_ERROR);
207 if (scsi_bidi_cmnd(sc)) {
208 struct scsi_data_buffer *sdb = scsi_in(sc);
210 sgl_bidi = sdb->table.sgl;
211 sgl_bidi_count = sdb->table.nents;
212 se_cmd->se_cmd_flags |= SCF_BIDI;
216 if (!scsi_prot_sg_count(sc) && scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
217 se_cmd->prot_pto = true;
219 rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
220 &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
221 scsi_bufflen(sc), tcm_loop_sam_attr(sc),
222 sc->sc_data_direction, 0,
223 scsi_sglist(sc), scsi_sg_count(sc),
224 sgl_bidi, sgl_bidi_count,
225 scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
227 set_host_byte(sc, DID_NO_CONNECT);
238 * ->queuecommand can be and usually is called from interrupt context, so
239 * defer the actual submission to a workqueue.
241 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
243 struct tcm_loop_cmd *tl_cmd;
245 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x"
246 " scsi_buf_len: %u\n", sc->device->host->host_no,
247 sc->device->id, sc->device->channel, sc->device->lun,
248 sc->cmnd[0], scsi_bufflen(sc));
250 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
252 pr_err("Unable to allocate struct tcm_loop_cmd\n");
253 set_host_byte(sc, DID_ERROR);
259 tl_cmd->sc_cmd_tag = sc->tag;
260 INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
261 queue_work(tcm_loop_workqueue, &tl_cmd->work);
266 * Called from SCSI EH process context to issue a LUN_RESET TMR
267 * to struct scsi_device
269 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
270 struct tcm_loop_nexus *tl_nexus,
271 int lun, int task, enum tcm_tmreq_table tmr)
273 struct se_cmd *se_cmd = NULL;
274 struct se_session *se_sess;
275 struct se_portal_group *se_tpg;
276 struct tcm_loop_cmd *tl_cmd = NULL;
277 struct tcm_loop_tmr *tl_tmr = NULL;
278 int ret = TMR_FUNCTION_FAILED, rc;
280 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
282 pr_err("Unable to allocate memory for tl_cmd\n");
286 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
288 pr_err("Unable to allocate memory for tl_tmr\n");
291 init_waitqueue_head(&tl_tmr->tl_tmr_wait);
293 se_cmd = &tl_cmd->tl_se_cmd;
294 se_tpg = &tl_tpg->tl_se_tpg;
295 se_sess = tl_nexus->se_sess;
297 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
299 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
300 DMA_NONE, MSG_SIMPLE_TAG,
301 &tl_cmd->tl_sense_buf[0]);
303 rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL);
307 if (tmr == TMR_ABORT_TASK)
308 se_cmd->se_tmr_req->ref_task_tag = task;
311 * Locate the underlying TCM struct se_lun
313 if (transport_lookup_tmr_lun(se_cmd, lun) < 0) {
314 ret = TMR_LUN_DOES_NOT_EXIST;
318 * Queue the TMR to TCM Core and sleep waiting for
319 * tcm_loop_queue_tm_rsp() to wake us up.
321 transport_generic_handle_tmr(se_cmd);
322 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
324 * The TMR LUN_RESET has completed, check the response status and
325 * then release allocations.
327 ret = se_cmd->se_tmr_req->response;
330 transport_generic_free_cmd(se_cmd, 1);
332 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
337 static int tcm_loop_abort_task(struct scsi_cmnd *sc)
339 struct tcm_loop_hba *tl_hba;
340 struct tcm_loop_nexus *tl_nexus;
341 struct tcm_loop_tpg *tl_tpg;
345 * Locate the tcm_loop_hba_t pointer
347 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
349 * Locate the tl_nexus and se_sess pointers
351 tl_nexus = tl_hba->tl_nexus;
353 pr_err("Unable to perform device reset without"
354 " active I_T Nexus\n");
359 * Locate the tl_tpg pointer from TargetID in sc->device->id
361 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
362 ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun,
363 sc->tag, TMR_ABORT_TASK);
364 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
368 * Called from SCSI EH process context to issue a LUN_RESET TMR
369 * to struct scsi_device
371 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
373 struct tcm_loop_hba *tl_hba;
374 struct tcm_loop_nexus *tl_nexus;
375 struct tcm_loop_tpg *tl_tpg;
379 * Locate the tcm_loop_hba_t pointer
381 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
383 * Locate the tl_nexus and se_sess pointers
385 tl_nexus = tl_hba->tl_nexus;
387 pr_err("Unable to perform device reset without"
388 " active I_T Nexus\n");
392 * Locate the tl_tpg pointer from TargetID in sc->device->id
394 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
395 ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun,
397 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
400 static int tcm_loop_target_reset(struct scsi_cmnd *sc)
402 struct tcm_loop_hba *tl_hba;
403 struct tcm_loop_tpg *tl_tpg;
406 * Locate the tcm_loop_hba_t pointer
408 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
410 pr_err("Unable to perform device reset without"
411 " active I_T Nexus\n");
415 * Locate the tl_tpg pointer from TargetID in sc->device->id
417 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
419 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
425 static int tcm_loop_slave_alloc(struct scsi_device *sd)
427 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
431 static int tcm_loop_slave_configure(struct scsi_device *sd)
433 if (sd->tagged_supported) {
434 scsi_activate_tcq(sd, sd->queue_depth);
435 scsi_adjust_queue_depth(sd, MSG_SIMPLE_TAG,
436 sd->host->cmd_per_lun);
438 scsi_adjust_queue_depth(sd, 0,
439 sd->host->cmd_per_lun);
445 static struct scsi_host_template tcm_loop_driver_template = {
446 .show_info = tcm_loop_show_info,
447 .proc_name = "tcm_loopback",
448 .name = "TCM_Loopback",
449 .queuecommand = tcm_loop_queuecommand,
450 .change_queue_depth = tcm_loop_change_queue_depth,
451 .change_queue_type = tcm_loop_change_queue_type,
452 .eh_abort_handler = tcm_loop_abort_task,
453 .eh_device_reset_handler = tcm_loop_device_reset,
454 .eh_target_reset_handler = tcm_loop_target_reset,
459 .max_sectors = 0xFFFF,
460 .use_clustering = DISABLE_CLUSTERING,
461 .slave_alloc = tcm_loop_slave_alloc,
462 .slave_configure = tcm_loop_slave_configure,
463 .module = THIS_MODULE,
466 static int tcm_loop_driver_probe(struct device *dev)
468 struct tcm_loop_hba *tl_hba;
469 struct Scsi_Host *sh;
470 int error, host_prot;
472 tl_hba = to_tcm_loop_hba(dev);
474 sh = scsi_host_alloc(&tcm_loop_driver_template,
475 sizeof(struct tcm_loop_hba));
477 pr_err("Unable to allocate struct scsi_host\n");
483 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
485 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
487 * Setup single ID, Channel and LUN for now..
492 sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN;
494 host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
495 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
496 SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
498 scsi_host_set_prot(sh, host_prot);
499 scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
501 error = scsi_add_host(sh, &tl_hba->dev);
503 pr_err("%s: scsi_add_host failed\n", __func__);
510 static int tcm_loop_driver_remove(struct device *dev)
512 struct tcm_loop_hba *tl_hba;
513 struct Scsi_Host *sh;
515 tl_hba = to_tcm_loop_hba(dev);
518 scsi_remove_host(sh);
523 static void tcm_loop_release_adapter(struct device *dev)
525 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
531 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
533 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
537 tl_hba->dev.bus = &tcm_loop_lld_bus;
538 tl_hba->dev.parent = tcm_loop_primary;
539 tl_hba->dev.release = &tcm_loop_release_adapter;
540 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
542 ret = device_register(&tl_hba->dev);
544 pr_err("device_register() failed for"
545 " tl_hba->dev: %d\n", ret);
553 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
556 static int tcm_loop_alloc_core_bus(void)
560 tcm_loop_primary = root_device_register("tcm_loop_0");
561 if (IS_ERR(tcm_loop_primary)) {
562 pr_err("Unable to allocate tcm_loop_primary\n");
563 return PTR_ERR(tcm_loop_primary);
566 ret = bus_register(&tcm_loop_lld_bus);
568 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
572 ret = driver_register(&tcm_loop_driverfs);
574 pr_err("driver_register() failed for"
575 "tcm_loop_driverfs\n");
579 pr_debug("Initialized TCM Loop Core Bus\n");
583 bus_unregister(&tcm_loop_lld_bus);
585 root_device_unregister(tcm_loop_primary);
589 static void tcm_loop_release_core_bus(void)
591 driver_unregister(&tcm_loop_driverfs);
592 bus_unregister(&tcm_loop_lld_bus);
593 root_device_unregister(tcm_loop_primary);
595 pr_debug("Releasing TCM Loop Core BUS\n");
598 static char *tcm_loop_get_fabric_name(void)
603 static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg)
605 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
606 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
608 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
609 * time based on the protocol dependent prefix of the passed configfs group.
611 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric
612 * ProtocolID using target_core_fabric_lib.c symbols.
614 switch (tl_hba->tl_proto_id) {
615 case SCSI_PROTOCOL_SAS:
616 return sas_get_fabric_proto_ident(se_tpg);
617 case SCSI_PROTOCOL_FCP:
618 return fc_get_fabric_proto_ident(se_tpg);
619 case SCSI_PROTOCOL_ISCSI:
620 return iscsi_get_fabric_proto_ident(se_tpg);
622 pr_err("Unknown tl_proto_id: 0x%02x, using"
623 " SAS emulation\n", tl_hba->tl_proto_id);
627 return sas_get_fabric_proto_ident(se_tpg);
630 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
632 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
634 * Return the passed NAA identifier for the SAS Target Port
636 return &tl_tpg->tl_hba->tl_wwn_address[0];
639 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
641 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
643 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
644 * to represent the SCSI Target Port.
646 return tl_tpg->tl_tpgt;
649 static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg)
654 static u32 tcm_loop_get_pr_transport_id(
655 struct se_portal_group *se_tpg,
656 struct se_node_acl *se_nacl,
657 struct t10_pr_registration *pr_reg,
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_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
668 case SCSI_PROTOCOL_FCP:
669 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
671 case SCSI_PROTOCOL_ISCSI:
672 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
675 pr_err("Unknown tl_proto_id: 0x%02x, using"
676 " SAS emulation\n", tl_hba->tl_proto_id);
680 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
684 static u32 tcm_loop_get_pr_transport_id_len(
685 struct se_portal_group *se_tpg,
686 struct se_node_acl *se_nacl,
687 struct t10_pr_registration *pr_reg,
690 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
691 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
693 switch (tl_hba->tl_proto_id) {
694 case SCSI_PROTOCOL_SAS:
695 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
697 case SCSI_PROTOCOL_FCP:
698 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
700 case SCSI_PROTOCOL_ISCSI:
701 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
704 pr_err("Unknown tl_proto_id: 0x%02x, using"
705 " SAS emulation\n", tl_hba->tl_proto_id);
709 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
714 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
715 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
717 static char *tcm_loop_parse_pr_out_transport_id(
718 struct se_portal_group *se_tpg,
721 char **port_nexus_ptr)
723 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
724 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
726 switch (tl_hba->tl_proto_id) {
727 case SCSI_PROTOCOL_SAS:
728 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
730 case SCSI_PROTOCOL_FCP:
731 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
733 case SCSI_PROTOCOL_ISCSI:
734 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
737 pr_err("Unknown tl_proto_id: 0x%02x, using"
738 " SAS emulation\n", tl_hba->tl_proto_id);
742 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
747 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
748 * based upon the incoming fabric dependent SCSI Initiator Port
750 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
755 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
761 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
762 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
764 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
770 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
771 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
772 * It has been added here as a nop for target_fabric_tf_ops_check()
774 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
779 static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl(
780 struct se_portal_group *se_tpg)
782 struct tcm_loop_nacl *tl_nacl;
784 tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL);
786 pr_err("Unable to allocate struct tcm_loop_nacl\n");
790 return &tl_nacl->se_node_acl;
793 static void tcm_loop_tpg_release_fabric_acl(
794 struct se_portal_group *se_tpg,
795 struct se_node_acl *se_nacl)
797 struct tcm_loop_nacl *tl_nacl = container_of(se_nacl,
798 struct tcm_loop_nacl, se_node_acl);
803 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
808 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
813 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
818 static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
820 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
821 struct tcm_loop_cmd, tl_se_cmd);
823 return tl_cmd->sc_cmd_tag;
826 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
828 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
829 struct tcm_loop_cmd, tl_se_cmd);
831 return tl_cmd->sc_cmd_state;
834 static int tcm_loop_shutdown_session(struct se_session *se_sess)
839 static void tcm_loop_close_session(struct se_session *se_sess)
844 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
847 * Since Linux/SCSI has already sent down a struct scsi_cmnd
848 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
849 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
850 * format with transport_generic_map_mem_to_cmd().
852 * We now tell TCM to add this WRITE CDB directly into the TCM storage
853 * object execution queue.
855 target_execute_cmd(se_cmd);
859 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
864 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
866 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
867 struct tcm_loop_cmd, tl_se_cmd);
868 struct scsi_cmnd *sc = tl_cmd->sc;
870 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
871 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
873 sc->result = SAM_STAT_GOOD;
874 set_host_byte(sc, DID_OK);
875 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
876 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
877 scsi_set_resid(sc, se_cmd->residual_count);
882 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
884 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
885 struct tcm_loop_cmd, tl_se_cmd);
886 struct scsi_cmnd *sc = tl_cmd->sc;
888 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
889 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
891 if (se_cmd->sense_buffer &&
892 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
893 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
895 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
896 SCSI_SENSE_BUFFERSIZE);
897 sc->result = SAM_STAT_CHECK_CONDITION;
898 set_driver_byte(sc, DRIVER_SENSE);
900 sc->result = se_cmd->scsi_status;
902 set_host_byte(sc, DID_OK);
903 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
904 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
905 scsi_set_resid(sc, se_cmd->residual_count);
910 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
912 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
913 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
915 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
916 * and wake up the wait_queue_head_t in tcm_loop_device_reset()
918 atomic_set(&tl_tmr->tmr_complete, 1);
919 wake_up(&tl_tmr->tl_tmr_wait);
922 static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
927 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
929 switch (tl_hba->tl_proto_id) {
930 case SCSI_PROTOCOL_SAS:
932 case SCSI_PROTOCOL_FCP:
934 case SCSI_PROTOCOL_ISCSI:
943 /* Start items for tcm_loop_port_cit */
945 static int tcm_loop_port_link(
946 struct se_portal_group *se_tpg,
949 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
950 struct tcm_loop_tpg, tl_se_tpg);
951 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
953 atomic_inc(&tl_tpg->tl_tpg_port_count);
954 smp_mb__after_atomic();
956 * Add Linux/SCSI struct scsi_device by HCTL
958 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
960 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
964 static void tcm_loop_port_unlink(
965 struct se_portal_group *se_tpg,
966 struct se_lun *se_lun)
968 struct scsi_device *sd;
969 struct tcm_loop_hba *tl_hba;
970 struct tcm_loop_tpg *tl_tpg;
972 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
973 tl_hba = tl_tpg->tl_hba;
975 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
976 se_lun->unpacked_lun);
978 pr_err("Unable to locate struct scsi_device for %d:%d:"
979 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
983 * Remove Linux/SCSI struct scsi_device by HCTL
985 scsi_remove_device(sd);
988 atomic_dec(&tl_tpg->tl_tpg_port_count);
989 smp_mb__after_atomic();
991 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
994 /* End items for tcm_loop_port_cit */
996 /* Start items for tcm_loop_nexus_cit */
998 static int tcm_loop_make_nexus(
999 struct tcm_loop_tpg *tl_tpg,
1002 struct se_portal_group *se_tpg;
1003 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1004 struct tcm_loop_nexus *tl_nexus;
1007 if (tl_tpg->tl_hba->tl_nexus) {
1008 pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n");
1011 se_tpg = &tl_tpg->tl_se_tpg;
1013 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
1015 pr_err("Unable to allocate struct tcm_loop_nexus\n");
1019 * Initialize the struct se_session pointer
1021 tl_nexus->se_sess = transport_init_session(TARGET_PROT_ALL);
1022 if (IS_ERR(tl_nexus->se_sess)) {
1023 ret = PTR_ERR(tl_nexus->se_sess);
1027 * Since we are running in 'demo mode' this call with generate a
1028 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
1029 * Initiator port name of the passed configfs group 'name'.
1031 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1032 se_tpg, (unsigned char *)name);
1033 if (!tl_nexus->se_sess->se_node_acl) {
1034 transport_free_session(tl_nexus->se_sess);
1038 * Now, register the SAS I_T Nexus as active with the call to
1039 * transport_register_session()
1041 __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
1042 tl_nexus->se_sess, tl_nexus);
1043 tl_tpg->tl_hba->tl_nexus = tl_nexus;
1044 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
1045 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1054 static int tcm_loop_drop_nexus(
1055 struct tcm_loop_tpg *tpg)
1057 struct se_session *se_sess;
1058 struct tcm_loop_nexus *tl_nexus;
1059 struct tcm_loop_hba *tl_hba = tpg->tl_hba;
1064 tl_nexus = tl_hba->tl_nexus;
1068 se_sess = tl_nexus->se_sess;
1072 if (atomic_read(&tpg->tl_tpg_port_count)) {
1073 pr_err("Unable to remove TCM_Loop I_T Nexus with"
1074 " active TPG port count: %d\n",
1075 atomic_read(&tpg->tl_tpg_port_count));
1079 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
1080 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1081 tl_nexus->se_sess->se_node_acl->initiatorname);
1083 * Release the SCSI I_T Nexus to the emulated SAS Target Port
1085 transport_deregister_session(tl_nexus->se_sess);
1086 tpg->tl_hba->tl_nexus = NULL;
1091 /* End items for tcm_loop_nexus_cit */
1093 static ssize_t tcm_loop_tpg_show_nexus(
1094 struct se_portal_group *se_tpg,
1097 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1098 struct tcm_loop_tpg, tl_se_tpg);
1099 struct tcm_loop_nexus *tl_nexus;
1102 tl_nexus = tl_tpg->tl_hba->tl_nexus;
1106 ret = snprintf(page, PAGE_SIZE, "%s\n",
1107 tl_nexus->se_sess->se_node_acl->initiatorname);
1112 static ssize_t tcm_loop_tpg_store_nexus(
1113 struct se_portal_group *se_tpg,
1117 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1118 struct tcm_loop_tpg, tl_se_tpg);
1119 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1120 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
1123 * Shutdown the active I_T nexus if 'NULL' is passed..
1125 if (!strncmp(page, "NULL", 4)) {
1126 ret = tcm_loop_drop_nexus(tl_tpg);
1127 return (!ret) ? count : ret;
1130 * Otherwise make sure the passed virtual Initiator port WWN matches
1131 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
1132 * tcm_loop_make_nexus()
1134 if (strlen(page) >= TL_WWN_ADDR_LEN) {
1135 pr_err("Emulated NAA Sas Address: %s, exceeds"
1136 " max: %d\n", page, TL_WWN_ADDR_LEN);
1139 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
1141 ptr = strstr(i_port, "naa.");
1143 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
1144 pr_err("Passed SAS Initiator Port %s does not"
1145 " match target port protoid: %s\n", i_port,
1146 tcm_loop_dump_proto_id(tl_hba));
1149 port_ptr = &i_port[0];
1152 ptr = strstr(i_port, "fc.");
1154 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
1155 pr_err("Passed FCP Initiator Port %s does not"
1156 " match target port protoid: %s\n", i_port,
1157 tcm_loop_dump_proto_id(tl_hba));
1160 port_ptr = &i_port[3]; /* Skip over "fc." */
1163 ptr = strstr(i_port, "iqn.");
1165 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
1166 pr_err("Passed iSCSI Initiator Port %s does not"
1167 " match target port protoid: %s\n", i_port,
1168 tcm_loop_dump_proto_id(tl_hba));
1171 port_ptr = &i_port[0];
1174 pr_err("Unable to locate prefix for emulated Initiator Port:"
1178 * Clear any trailing newline for the NAA WWN
1181 if (i_port[strlen(i_port)-1] == '\n')
1182 i_port[strlen(i_port)-1] = '\0';
1184 ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
1191 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR);
1193 static ssize_t tcm_loop_tpg_show_transport_status(
1194 struct se_portal_group *se_tpg,
1197 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1198 struct tcm_loop_tpg, tl_se_tpg);
1199 const char *status = NULL;
1200 ssize_t ret = -EINVAL;
1202 switch (tl_tpg->tl_transport_status) {
1203 case TCM_TRANSPORT_ONLINE:
1206 case TCM_TRANSPORT_OFFLINE:
1214 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
1219 static ssize_t tcm_loop_tpg_store_transport_status(
1220 struct se_portal_group *se_tpg,
1224 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1225 struct tcm_loop_tpg, tl_se_tpg);
1227 if (!strncmp(page, "online", 6)) {
1228 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
1231 if (!strncmp(page, "offline", 7)) {
1232 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
1238 TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR);
1240 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1241 &tcm_loop_tpg_nexus.attr,
1242 &tcm_loop_tpg_transport_status.attr,
1246 /* Start items for tcm_loop_naa_cit */
1248 static struct se_portal_group *tcm_loop_make_naa_tpg(
1250 struct config_group *group,
1253 struct tcm_loop_hba *tl_hba = container_of(wwn,
1254 struct tcm_loop_hba, tl_hba_wwn);
1255 struct tcm_loop_tpg *tl_tpg;
1256 char *tpgt_str, *end_ptr;
1258 unsigned short int tpgt;
1260 tpgt_str = strstr(name, "tpgt_");
1262 pr_err("Unable to locate \"tpgt_#\" directory"
1264 return ERR_PTR(-EINVAL);
1266 tpgt_str += 5; /* Skip ahead of "tpgt_" */
1267 tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0);
1269 if (tpgt >= TL_TPGS_PER_HBA) {
1270 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1271 " %u\n", tpgt, TL_TPGS_PER_HBA);
1272 return ERR_PTR(-EINVAL);
1274 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1275 tl_tpg->tl_hba = tl_hba;
1276 tl_tpg->tl_tpgt = tpgt;
1278 * Register the tl_tpg as a emulated SAS TCM Target Endpoint
1280 ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops,
1281 wwn, &tl_tpg->tl_se_tpg, tl_tpg,
1282 TRANSPORT_TPG_TYPE_NORMAL);
1284 return ERR_PTR(-ENOMEM);
1286 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1287 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1288 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1290 return &tl_tpg->tl_se_tpg;
1293 static void tcm_loop_drop_naa_tpg(
1294 struct se_portal_group *se_tpg)
1296 struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1297 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1298 struct tcm_loop_tpg, tl_se_tpg);
1299 struct tcm_loop_hba *tl_hba;
1300 unsigned short tpgt;
1302 tl_hba = tl_tpg->tl_hba;
1303 tpgt = tl_tpg->tl_tpgt;
1305 * Release the I_T Nexus for the Virtual SAS link if present
1307 tcm_loop_drop_nexus(tl_tpg);
1309 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1311 core_tpg_deregister(se_tpg);
1313 tl_tpg->tl_hba = NULL;
1314 tl_tpg->tl_tpgt = 0;
1316 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1317 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1318 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1321 /* End items for tcm_loop_naa_cit */
1323 /* Start items for tcm_loop_cit */
1325 static struct se_wwn *tcm_loop_make_scsi_hba(
1326 struct target_fabric_configfs *tf,
1327 struct config_group *group,
1330 struct tcm_loop_hba *tl_hba;
1331 struct Scsi_Host *sh;
1335 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1337 pr_err("Unable to allocate struct tcm_loop_hba\n");
1338 return ERR_PTR(-ENOMEM);
1341 * Determine the emulated Protocol Identifier and Target Port Name
1342 * based on the incoming configfs directory name.
1344 ptr = strstr(name, "naa.");
1346 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1349 ptr = strstr(name, "fc.");
1351 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1352 off = 3; /* Skip over "fc." */
1355 ptr = strstr(name, "iqn.");
1357 pr_err("Unable to locate prefix for emulated Target "
1358 "Port: %s\n", name);
1362 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1365 if (strlen(name) >= TL_WWN_ADDR_LEN) {
1366 pr_err("Emulated NAA %s Address: %s, exceeds"
1367 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1372 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1375 * Call device_register(tl_hba->dev) to register the emulated
1376 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1377 * device_register() callbacks in tcm_loop_driver_probe()
1379 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1384 tcm_loop_hba_no_cnt++;
1385 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1386 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1387 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1389 return &tl_hba->tl_hba_wwn;
1392 return ERR_PTR(ret);
1395 static void tcm_loop_drop_scsi_hba(
1398 struct tcm_loop_hba *tl_hba = container_of(wwn,
1399 struct tcm_loop_hba, tl_hba_wwn);
1401 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1402 " SAS Address: %s at Linux/SCSI Host ID: %d\n",
1403 tl_hba->tl_wwn_address, tl_hba->sh->host_no);
1405 * Call device_unregister() on the original tl_hba->dev.
1406 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1409 device_unregister(&tl_hba->dev);
1412 /* Start items for tcm_loop_cit */
1413 static ssize_t tcm_loop_wwn_show_attr_version(
1414 struct target_fabric_configfs *tf,
1417 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1420 TF_WWN_ATTR_RO(tcm_loop, version);
1422 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1423 &tcm_loop_wwn_version.attr,
1427 /* End items for tcm_loop_cit */
1429 static int tcm_loop_register_configfs(void)
1431 struct target_fabric_configfs *fabric;
1434 * Set the TCM Loop HBA counter to zero
1436 tcm_loop_hba_no_cnt = 0;
1438 * Register the top level struct config_item_type with TCM core
1440 fabric = target_fabric_configfs_init(THIS_MODULE, "loopback");
1441 if (IS_ERR(fabric)) {
1442 pr_err("tcm_loop_register_configfs() failed!\n");
1443 return PTR_ERR(fabric);
1446 * Setup the fabric API of function pointers used by target_core_mod
1448 fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name;
1449 fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident;
1450 fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn;
1451 fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag;
1452 fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth;
1453 fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id;
1454 fabric->tf_ops.tpg_get_pr_transport_id_len =
1455 &tcm_loop_get_pr_transport_id_len;
1456 fabric->tf_ops.tpg_parse_pr_out_transport_id =
1457 &tcm_loop_parse_pr_out_transport_id;
1458 fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode;
1459 fabric->tf_ops.tpg_check_demo_mode_cache =
1460 &tcm_loop_check_demo_mode_cache;
1461 fabric->tf_ops.tpg_check_demo_mode_write_protect =
1462 &tcm_loop_check_demo_mode_write_protect;
1463 fabric->tf_ops.tpg_check_prod_mode_write_protect =
1464 &tcm_loop_check_prod_mode_write_protect;
1466 * The TCM loopback fabric module runs in demo-mode to a local
1467 * virtual SCSI device, so fabric dependent initator ACLs are
1470 fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl;
1471 fabric->tf_ops.tpg_release_fabric_acl =
1472 &tcm_loop_tpg_release_fabric_acl;
1473 fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index;
1475 * Used for setting up remaining TCM resources in process context
1477 fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free;
1478 fabric->tf_ops.release_cmd = &tcm_loop_release_cmd;
1479 fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session;
1480 fabric->tf_ops.close_session = &tcm_loop_close_session;
1481 fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index;
1482 fabric->tf_ops.sess_get_initiator_sid = NULL;
1483 fabric->tf_ops.write_pending = &tcm_loop_write_pending;
1484 fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status;
1486 * Not used for TCM loopback
1488 fabric->tf_ops.set_default_node_attributes =
1489 &tcm_loop_set_default_node_attributes;
1490 fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag;
1491 fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state;
1492 fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in;
1493 fabric->tf_ops.queue_status = &tcm_loop_queue_status;
1494 fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp;
1495 fabric->tf_ops.aborted_task = &tcm_loop_aborted_task;
1498 * Setup function pointers for generic logic in target_core_fabric_configfs.c
1500 fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba;
1501 fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba;
1502 fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg;
1503 fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg;
1505 * fabric_post_link() and fabric_pre_unlink() are used for
1506 * registration and release of TCM Loop Virtual SCSI LUNs.
1508 fabric->tf_ops.fabric_post_link = &tcm_loop_port_link;
1509 fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink;
1510 fabric->tf_ops.fabric_make_np = NULL;
1511 fabric->tf_ops.fabric_drop_np = NULL;
1513 * Setup default attribute lists for various fabric->tf_cit_tmpl
1515 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs;
1516 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs;
1517 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
1518 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
1519 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
1521 * Once fabric->tf_ops has been setup, now register the fabric for
1524 ret = target_fabric_configfs_register(fabric);
1526 pr_err("target_fabric_configfs_register() for"
1527 " TCM_Loop failed!\n");
1528 target_fabric_configfs_free(fabric);
1532 * Setup our local pointer to *fabric.
1534 tcm_loop_fabric_configfs = fabric;
1535 pr_debug("TCM_LOOP[0] - Set fabric ->"
1536 " tcm_loop_fabric_configfs\n");
1540 static void tcm_loop_deregister_configfs(void)
1542 if (!tcm_loop_fabric_configfs)
1545 target_fabric_configfs_deregister(tcm_loop_fabric_configfs);
1546 tcm_loop_fabric_configfs = NULL;
1547 pr_debug("TCM_LOOP[0] - Cleared"
1548 " tcm_loop_fabric_configfs\n");
1551 static int __init tcm_loop_fabric_init(void)
1555 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1556 if (!tcm_loop_workqueue)
1559 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1560 sizeof(struct tcm_loop_cmd),
1561 __alignof__(struct tcm_loop_cmd),
1563 if (!tcm_loop_cmd_cache) {
1564 pr_debug("kmem_cache_create() for"
1565 " tcm_loop_cmd_cache failed\n");
1566 goto out_destroy_workqueue;
1569 ret = tcm_loop_alloc_core_bus();
1571 goto out_destroy_cache;
1573 ret = tcm_loop_register_configfs();
1575 goto out_release_core_bus;
1579 out_release_core_bus:
1580 tcm_loop_release_core_bus();
1582 kmem_cache_destroy(tcm_loop_cmd_cache);
1583 out_destroy_workqueue:
1584 destroy_workqueue(tcm_loop_workqueue);
1589 static void __exit tcm_loop_fabric_exit(void)
1591 tcm_loop_deregister_configfs();
1592 tcm_loop_release_core_bus();
1593 kmem_cache_destroy(tcm_loop_cmd_cache);
1594 destroy_workqueue(tcm_loop_workqueue);
1597 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1598 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1599 MODULE_LICENSE("GPL");
1600 module_init(tcm_loop_fabric_init);
1601 module_exit(tcm_loop_fabric_exit);