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_inc();
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_dec();
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();
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
);