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
, int tag
)
158 if (sc
->device
->tagged_supported
&&
159 sc
->device
->ordered_tags
&& tag
>= 0)
160 return MSG_ORDERED_TAG
;
162 return MSG_SIMPLE_TAG
;
165 static void tcm_loop_submission_work(struct work_struct
*work
)
167 struct tcm_loop_cmd
*tl_cmd
=
168 container_of(work
, struct tcm_loop_cmd
, work
);
169 struct se_cmd
*se_cmd
= &tl_cmd
->tl_se_cmd
;
170 struct scsi_cmnd
*sc
= tl_cmd
->sc
;
171 struct tcm_loop_nexus
*tl_nexus
;
172 struct tcm_loop_hba
*tl_hba
;
173 struct tcm_loop_tpg
*tl_tpg
;
174 struct scatterlist
*sgl_bidi
= NULL
;
175 u32 sgl_bidi_count
= 0;
178 tl_hba
= *(struct tcm_loop_hba
**)shost_priv(sc
->device
->host
);
179 tl_tpg
= &tl_hba
->tl_hba_tpgs
[sc
->device
->id
];
182 * Ensure that this tl_tpg reference from the incoming sc->device->id
183 * has already been configured via tcm_loop_make_naa_tpg().
185 if (!tl_tpg
->tl_hba
) {
186 set_host_byte(sc
, DID_NO_CONNECT
);
189 if (tl_tpg
->tl_transport_status
== TCM_TRANSPORT_OFFLINE
) {
190 set_host_byte(sc
, DID_TRANSPORT_DISRUPTED
);
193 tl_nexus
= tl_tpg
->tl_nexus
;
195 scmd_printk(KERN_ERR
, sc
, "TCM_Loop I_T Nexus"
196 " does not exist\n");
197 set_host_byte(sc
, DID_ERROR
);
200 if (scsi_bidi_cmnd(sc
)) {
201 struct scsi_data_buffer
*sdb
= scsi_in(sc
);
203 sgl_bidi
= sdb
->table
.sgl
;
204 sgl_bidi_count
= sdb
->table
.nents
;
205 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
208 rc
= target_submit_cmd_map_sgls(se_cmd
, tl_nexus
->se_sess
, sc
->cmnd
,
209 &tl_cmd
->tl_sense_buf
[0], tl_cmd
->sc
->device
->lun
,
210 scsi_bufflen(sc
), tcm_loop_sam_attr(sc
, tl_cmd
->sc_cmd_tag
),
211 sc
->sc_data_direction
, 0,
212 scsi_sglist(sc
), scsi_sg_count(sc
),
213 sgl_bidi
, sgl_bidi_count
,
214 scsi_prot_sglist(sc
), scsi_prot_sg_count(sc
));
216 set_host_byte(sc
, DID_NO_CONNECT
);
227 * ->queuecommand can be and usually is called from interrupt context, so
228 * defer the actual submission to a workqueue.
230 static int tcm_loop_queuecommand(struct Scsi_Host
*sh
, struct scsi_cmnd
*sc
)
232 struct tcm_loop_cmd
*tl_cmd
;
234 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x"
235 " scsi_buf_len: %u\n", sc
->device
->host
->host_no
,
236 sc
->device
->id
, sc
->device
->channel
, sc
->device
->lun
,
237 sc
->cmnd
[0], scsi_bufflen(sc
));
239 tl_cmd
= kmem_cache_zalloc(tcm_loop_cmd_cache
, GFP_ATOMIC
);
241 pr_err("Unable to allocate struct tcm_loop_cmd\n");
242 set_host_byte(sc
, DID_ERROR
);
248 tl_cmd
->sc_cmd_tag
= sc
->request
->tag
;
249 INIT_WORK(&tl_cmd
->work
, tcm_loop_submission_work
);
250 queue_work(tcm_loop_workqueue
, &tl_cmd
->work
);
255 * Called from SCSI EH process context to issue a LUN_RESET TMR
256 * to struct scsi_device
258 static int tcm_loop_issue_tmr(struct tcm_loop_tpg
*tl_tpg
,
259 int lun
, int task
, enum tcm_tmreq_table tmr
)
261 struct se_cmd
*se_cmd
= NULL
;
262 struct se_session
*se_sess
;
263 struct se_portal_group
*se_tpg
;
264 struct tcm_loop_nexus
*tl_nexus
;
265 struct tcm_loop_cmd
*tl_cmd
= NULL
;
266 struct tcm_loop_tmr
*tl_tmr
= NULL
;
267 int ret
= TMR_FUNCTION_FAILED
, rc
;
270 * Locate the tl_nexus and se_sess pointers
272 tl_nexus
= tl_tpg
->tl_nexus
;
274 pr_err("Unable to perform device reset without"
275 " active I_T Nexus\n");
279 tl_cmd
= kmem_cache_zalloc(tcm_loop_cmd_cache
, GFP_KERNEL
);
281 pr_err("Unable to allocate memory for tl_cmd\n");
285 tl_tmr
= kzalloc(sizeof(struct tcm_loop_tmr
), GFP_KERNEL
);
287 pr_err("Unable to allocate memory for tl_tmr\n");
290 init_waitqueue_head(&tl_tmr
->tl_tmr_wait
);
292 se_cmd
= &tl_cmd
->tl_se_cmd
;
293 se_tpg
= &tl_tpg
->tl_se_tpg
;
294 se_sess
= tl_tpg
->tl_nexus
->se_sess
;
296 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
298 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
, 0,
299 DMA_NONE
, MSG_SIMPLE_TAG
,
300 &tl_cmd
->tl_sense_buf
[0]);
302 rc
= core_tmr_alloc_req(se_cmd
, tl_tmr
, tmr
, GFP_KERNEL
);
306 if (tmr
== TMR_ABORT_TASK
)
307 se_cmd
->se_tmr_req
->ref_task_tag
= task
;
310 * Locate the underlying TCM struct se_lun
312 if (transport_lookup_tmr_lun(se_cmd
, lun
) < 0) {
313 ret
= TMR_LUN_DOES_NOT_EXIST
;
317 * Queue the TMR to TCM Core and sleep waiting for
318 * tcm_loop_queue_tm_rsp() to wake us up.
320 transport_generic_handle_tmr(se_cmd
);
321 wait_event(tl_tmr
->tl_tmr_wait
, atomic_read(&tl_tmr
->tmr_complete
));
323 * The TMR LUN_RESET has completed, check the response status and
324 * then release allocations.
326 ret
= se_cmd
->se_tmr_req
->response
;
329 transport_generic_free_cmd(se_cmd
, 1);
331 kmem_cache_free(tcm_loop_cmd_cache
, tl_cmd
);
336 static int tcm_loop_abort_task(struct scsi_cmnd
*sc
)
338 struct tcm_loop_hba
*tl_hba
;
339 struct tcm_loop_tpg
*tl_tpg
;
343 * Locate the tcm_loop_hba_t pointer
345 tl_hba
= *(struct tcm_loop_hba
**)shost_priv(sc
->device
->host
);
346 tl_tpg
= &tl_hba
->tl_hba_tpgs
[sc
->device
->id
];
347 ret
= tcm_loop_issue_tmr(tl_tpg
, sc
->device
->lun
,
348 sc
->request
->tag
, TMR_ABORT_TASK
);
349 return (ret
== TMR_FUNCTION_COMPLETE
) ? SUCCESS
: FAILED
;
353 * Called from SCSI EH process context to issue a LUN_RESET TMR
354 * to struct scsi_device
356 static int tcm_loop_device_reset(struct scsi_cmnd
*sc
)
358 struct tcm_loop_hba
*tl_hba
;
359 struct tcm_loop_tpg
*tl_tpg
;
363 * Locate the tcm_loop_hba_t pointer
365 tl_hba
= *(struct tcm_loop_hba
**)shost_priv(sc
->device
->host
);
366 tl_tpg
= &tl_hba
->tl_hba_tpgs
[sc
->device
->id
];
368 ret
= tcm_loop_issue_tmr(tl_tpg
, sc
->device
->lun
,
370 return (ret
== TMR_FUNCTION_COMPLETE
) ? SUCCESS
: FAILED
;
373 static int tcm_loop_target_reset(struct scsi_cmnd
*sc
)
375 struct tcm_loop_hba
*tl_hba
;
376 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 pr_err("Unable to perform device reset without"
384 " active I_T Nexus\n");
388 * Locate the tl_tpg pointer from TargetID in sc->device->id
390 tl_tpg
= &tl_hba
->tl_hba_tpgs
[sc
->device
->id
];
392 tl_tpg
->tl_transport_status
= TCM_TRANSPORT_ONLINE
;
398 static int tcm_loop_slave_alloc(struct scsi_device
*sd
)
400 set_bit(QUEUE_FLAG_BIDI
, &sd
->request_queue
->queue_flags
);
404 static int tcm_loop_slave_configure(struct scsi_device
*sd
)
406 if (sd
->tagged_supported
) {
407 scsi_activate_tcq(sd
, sd
->queue_depth
);
408 scsi_adjust_queue_depth(sd
, MSG_SIMPLE_TAG
,
409 sd
->host
->cmd_per_lun
);
411 scsi_adjust_queue_depth(sd
, 0,
412 sd
->host
->cmd_per_lun
);
418 static struct scsi_host_template tcm_loop_driver_template
= {
419 .show_info
= tcm_loop_show_info
,
420 .proc_name
= "tcm_loopback",
421 .name
= "TCM_Loopback",
422 .queuecommand
= tcm_loop_queuecommand
,
423 .change_queue_depth
= tcm_loop_change_queue_depth
,
424 .change_queue_type
= tcm_loop_change_queue_type
,
425 .eh_abort_handler
= tcm_loop_abort_task
,
426 .eh_device_reset_handler
= tcm_loop_device_reset
,
427 .eh_target_reset_handler
= tcm_loop_target_reset
,
432 .max_sectors
= 0xFFFF,
433 .use_clustering
= DISABLE_CLUSTERING
,
434 .slave_alloc
= tcm_loop_slave_alloc
,
435 .slave_configure
= tcm_loop_slave_configure
,
436 .module
= THIS_MODULE
,
439 static int tcm_loop_driver_probe(struct device
*dev
)
441 struct tcm_loop_hba
*tl_hba
;
442 struct Scsi_Host
*sh
;
443 int error
, host_prot
;
445 tl_hba
= to_tcm_loop_hba(dev
);
447 sh
= scsi_host_alloc(&tcm_loop_driver_template
,
448 sizeof(struct tcm_loop_hba
));
450 pr_err("Unable to allocate struct scsi_host\n");
456 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
458 *((struct tcm_loop_hba
**)sh
->hostdata
) = tl_hba
;
460 * Setup single ID, Channel and LUN for now..
465 sh
->max_cmd_len
= TL_SCSI_MAX_CMD_LEN
;
467 host_prot
= SHOST_DIF_TYPE1_PROTECTION
| SHOST_DIF_TYPE2_PROTECTION
|
468 SHOST_DIF_TYPE3_PROTECTION
| SHOST_DIX_TYPE1_PROTECTION
|
469 SHOST_DIX_TYPE2_PROTECTION
| SHOST_DIX_TYPE3_PROTECTION
;
471 scsi_host_set_prot(sh
, host_prot
);
472 scsi_host_set_guard(sh
, SHOST_DIX_GUARD_CRC
);
474 error
= scsi_add_host(sh
, &tl_hba
->dev
);
476 pr_err("%s: scsi_add_host failed\n", __func__
);
483 static int tcm_loop_driver_remove(struct device
*dev
)
485 struct tcm_loop_hba
*tl_hba
;
486 struct Scsi_Host
*sh
;
488 tl_hba
= to_tcm_loop_hba(dev
);
491 scsi_remove_host(sh
);
496 static void tcm_loop_release_adapter(struct device
*dev
)
498 struct tcm_loop_hba
*tl_hba
= to_tcm_loop_hba(dev
);
504 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
506 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba
*tl_hba
, int tcm_loop_host_id
)
510 tl_hba
->dev
.bus
= &tcm_loop_lld_bus
;
511 tl_hba
->dev
.parent
= tcm_loop_primary
;
512 tl_hba
->dev
.release
= &tcm_loop_release_adapter
;
513 dev_set_name(&tl_hba
->dev
, "tcm_loop_adapter_%d", tcm_loop_host_id
);
515 ret
= device_register(&tl_hba
->dev
);
517 pr_err("device_register() failed for"
518 " tl_hba->dev: %d\n", ret
);
526 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
529 static int tcm_loop_alloc_core_bus(void)
533 tcm_loop_primary
= root_device_register("tcm_loop_0");
534 if (IS_ERR(tcm_loop_primary
)) {
535 pr_err("Unable to allocate tcm_loop_primary\n");
536 return PTR_ERR(tcm_loop_primary
);
539 ret
= bus_register(&tcm_loop_lld_bus
);
541 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
545 ret
= driver_register(&tcm_loop_driverfs
);
547 pr_err("driver_register() failed for"
548 "tcm_loop_driverfs\n");
552 pr_debug("Initialized TCM Loop Core Bus\n");
556 bus_unregister(&tcm_loop_lld_bus
);
558 root_device_unregister(tcm_loop_primary
);
562 static void tcm_loop_release_core_bus(void)
564 driver_unregister(&tcm_loop_driverfs
);
565 bus_unregister(&tcm_loop_lld_bus
);
566 root_device_unregister(tcm_loop_primary
);
568 pr_debug("Releasing TCM Loop Core BUS\n");
571 static char *tcm_loop_get_fabric_name(void)
576 static u8
tcm_loop_get_fabric_proto_ident(struct se_portal_group
*se_tpg
)
578 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
579 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
581 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
582 * time based on the protocol dependent prefix of the passed configfs group.
584 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric
585 * ProtocolID using target_core_fabric_lib.c symbols.
587 switch (tl_hba
->tl_proto_id
) {
588 case SCSI_PROTOCOL_SAS
:
589 return sas_get_fabric_proto_ident(se_tpg
);
590 case SCSI_PROTOCOL_FCP
:
591 return fc_get_fabric_proto_ident(se_tpg
);
592 case SCSI_PROTOCOL_ISCSI
:
593 return iscsi_get_fabric_proto_ident(se_tpg
);
595 pr_err("Unknown tl_proto_id: 0x%02x, using"
596 " SAS emulation\n", tl_hba
->tl_proto_id
);
600 return sas_get_fabric_proto_ident(se_tpg
);
603 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group
*se_tpg
)
605 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
607 * Return the passed NAA identifier for the SAS Target Port
609 return &tl_tpg
->tl_hba
->tl_wwn_address
[0];
612 static u16
tcm_loop_get_tag(struct se_portal_group
*se_tpg
)
614 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
616 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
617 * to represent the SCSI Target Port.
619 return tl_tpg
->tl_tpgt
;
622 static u32
tcm_loop_get_default_depth(struct se_portal_group
*se_tpg
)
627 static u32
tcm_loop_get_pr_transport_id(
628 struct se_portal_group
*se_tpg
,
629 struct se_node_acl
*se_nacl
,
630 struct t10_pr_registration
*pr_reg
,
634 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
635 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
637 switch (tl_hba
->tl_proto_id
) {
638 case SCSI_PROTOCOL_SAS
:
639 return sas_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
641 case SCSI_PROTOCOL_FCP
:
642 return fc_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
644 case SCSI_PROTOCOL_ISCSI
:
645 return iscsi_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
648 pr_err("Unknown tl_proto_id: 0x%02x, using"
649 " SAS emulation\n", tl_hba
->tl_proto_id
);
653 return sas_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
657 static u32
tcm_loop_get_pr_transport_id_len(
658 struct se_portal_group
*se_tpg
,
659 struct se_node_acl
*se_nacl
,
660 struct t10_pr_registration
*pr_reg
,
663 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
664 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
666 switch (tl_hba
->tl_proto_id
) {
667 case SCSI_PROTOCOL_SAS
:
668 return sas_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
670 case SCSI_PROTOCOL_FCP
:
671 return fc_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
673 case SCSI_PROTOCOL_ISCSI
:
674 return iscsi_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
677 pr_err("Unknown tl_proto_id: 0x%02x, using"
678 " SAS emulation\n", tl_hba
->tl_proto_id
);
682 return sas_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
687 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
688 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
690 static char *tcm_loop_parse_pr_out_transport_id(
691 struct se_portal_group
*se_tpg
,
694 char **port_nexus_ptr
)
696 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
697 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
699 switch (tl_hba
->tl_proto_id
) {
700 case SCSI_PROTOCOL_SAS
:
701 return sas_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
703 case SCSI_PROTOCOL_FCP
:
704 return fc_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
706 case SCSI_PROTOCOL_ISCSI
:
707 return iscsi_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
710 pr_err("Unknown tl_proto_id: 0x%02x, using"
711 " SAS emulation\n", tl_hba
->tl_proto_id
);
715 return sas_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
720 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
721 * based upon the incoming fabric dependent SCSI Initiator Port
723 static int tcm_loop_check_demo_mode(struct se_portal_group
*se_tpg
)
728 static int tcm_loop_check_demo_mode_cache(struct se_portal_group
*se_tpg
)
734 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
735 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
737 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group
*se_tpg
)
743 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
744 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
745 * It has been added here as a nop for target_fabric_tf_ops_check()
747 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group
*se_tpg
)
752 static struct se_node_acl
*tcm_loop_tpg_alloc_fabric_acl(
753 struct se_portal_group
*se_tpg
)
755 struct tcm_loop_nacl
*tl_nacl
;
757 tl_nacl
= kzalloc(sizeof(struct tcm_loop_nacl
), GFP_KERNEL
);
759 pr_err("Unable to allocate struct tcm_loop_nacl\n");
763 return &tl_nacl
->se_node_acl
;
766 static void tcm_loop_tpg_release_fabric_acl(
767 struct se_portal_group
*se_tpg
,
768 struct se_node_acl
*se_nacl
)
770 struct tcm_loop_nacl
*tl_nacl
= container_of(se_nacl
,
771 struct tcm_loop_nacl
, se_node_acl
);
776 static u32
tcm_loop_get_inst_index(struct se_portal_group
*se_tpg
)
781 static u32
tcm_loop_sess_get_index(struct se_session
*se_sess
)
786 static void tcm_loop_set_default_node_attributes(struct se_node_acl
*se_acl
)
791 static u32
tcm_loop_get_task_tag(struct se_cmd
*se_cmd
)
793 struct tcm_loop_cmd
*tl_cmd
= container_of(se_cmd
,
794 struct tcm_loop_cmd
, tl_se_cmd
);
796 return tl_cmd
->sc_cmd_tag
;
799 static int tcm_loop_get_cmd_state(struct se_cmd
*se_cmd
)
801 struct tcm_loop_cmd
*tl_cmd
= container_of(se_cmd
,
802 struct tcm_loop_cmd
, tl_se_cmd
);
804 return tl_cmd
->sc_cmd_state
;
807 static int tcm_loop_shutdown_session(struct se_session
*se_sess
)
812 static void tcm_loop_close_session(struct se_session
*se_sess
)
817 static int tcm_loop_write_pending(struct se_cmd
*se_cmd
)
820 * Since Linux/SCSI has already sent down a struct scsi_cmnd
821 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
822 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
823 * format with transport_generic_map_mem_to_cmd().
825 * We now tell TCM to add this WRITE CDB directly into the TCM storage
826 * object execution queue.
828 target_execute_cmd(se_cmd
);
832 static int tcm_loop_write_pending_status(struct se_cmd
*se_cmd
)
837 static int tcm_loop_queue_data_in(struct se_cmd
*se_cmd
)
839 struct tcm_loop_cmd
*tl_cmd
= container_of(se_cmd
,
840 struct tcm_loop_cmd
, tl_se_cmd
);
841 struct scsi_cmnd
*sc
= tl_cmd
->sc
;
843 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
844 " cdb: 0x%02x\n", sc
, sc
->cmnd
[0]);
846 sc
->result
= SAM_STAT_GOOD
;
847 set_host_byte(sc
, DID_OK
);
848 if ((se_cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) ||
849 (se_cmd
->se_cmd_flags
& SCF_UNDERFLOW_BIT
))
850 scsi_set_resid(sc
, se_cmd
->residual_count
);
855 static int tcm_loop_queue_status(struct se_cmd
*se_cmd
)
857 struct tcm_loop_cmd
*tl_cmd
= container_of(se_cmd
,
858 struct tcm_loop_cmd
, tl_se_cmd
);
859 struct scsi_cmnd
*sc
= tl_cmd
->sc
;
861 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
862 " cdb: 0x%02x\n", sc
, sc
->cmnd
[0]);
864 if (se_cmd
->sense_buffer
&&
865 ((se_cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ||
866 (se_cmd
->se_cmd_flags
& SCF_EMULATED_TASK_SENSE
))) {
868 memcpy(sc
->sense_buffer
, se_cmd
->sense_buffer
,
869 SCSI_SENSE_BUFFERSIZE
);
870 sc
->result
= SAM_STAT_CHECK_CONDITION
;
871 set_driver_byte(sc
, DRIVER_SENSE
);
873 sc
->result
= se_cmd
->scsi_status
;
875 set_host_byte(sc
, DID_OK
);
876 if ((se_cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) ||
877 (se_cmd
->se_cmd_flags
& SCF_UNDERFLOW_BIT
))
878 scsi_set_resid(sc
, se_cmd
->residual_count
);
883 static void tcm_loop_queue_tm_rsp(struct se_cmd
*se_cmd
)
885 struct se_tmr_req
*se_tmr
= se_cmd
->se_tmr_req
;
886 struct tcm_loop_tmr
*tl_tmr
= se_tmr
->fabric_tmr_ptr
;
888 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
889 * and wake up the wait_queue_head_t in tcm_loop_device_reset()
891 atomic_set(&tl_tmr
->tmr_complete
, 1);
892 wake_up(&tl_tmr
->tl_tmr_wait
);
895 static void tcm_loop_aborted_task(struct se_cmd
*se_cmd
)
900 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba
*tl_hba
)
902 switch (tl_hba
->tl_proto_id
) {
903 case SCSI_PROTOCOL_SAS
:
905 case SCSI_PROTOCOL_FCP
:
907 case SCSI_PROTOCOL_ISCSI
:
916 /* Start items for tcm_loop_port_cit */
918 static int tcm_loop_port_link(
919 struct se_portal_group
*se_tpg
,
922 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
923 struct tcm_loop_tpg
, tl_se_tpg
);
924 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
926 atomic_inc(&tl_tpg
->tl_tpg_port_count
);
927 smp_mb__after_atomic_inc();
929 * Add Linux/SCSI struct scsi_device by HCTL
931 scsi_add_device(tl_hba
->sh
, 0, tl_tpg
->tl_tpgt
, lun
->unpacked_lun
);
933 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
937 static void tcm_loop_port_unlink(
938 struct se_portal_group
*se_tpg
,
939 struct se_lun
*se_lun
)
941 struct scsi_device
*sd
;
942 struct tcm_loop_hba
*tl_hba
;
943 struct tcm_loop_tpg
*tl_tpg
;
945 tl_tpg
= container_of(se_tpg
, struct tcm_loop_tpg
, tl_se_tpg
);
946 tl_hba
= tl_tpg
->tl_hba
;
948 sd
= scsi_device_lookup(tl_hba
->sh
, 0, tl_tpg
->tl_tpgt
,
949 se_lun
->unpacked_lun
);
951 pr_err("Unable to locate struct scsi_device for %d:%d:"
952 "%d\n", 0, tl_tpg
->tl_tpgt
, se_lun
->unpacked_lun
);
956 * Remove Linux/SCSI struct scsi_device by HCTL
958 scsi_remove_device(sd
);
961 atomic_dec(&tl_tpg
->tl_tpg_port_count
);
962 smp_mb__after_atomic_dec();
964 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
967 /* End items for tcm_loop_port_cit */
969 /* Start items for tcm_loop_nexus_cit */
971 static int tcm_loop_make_nexus(
972 struct tcm_loop_tpg
*tl_tpg
,
975 struct se_portal_group
*se_tpg
;
976 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
977 struct tcm_loop_nexus
*tl_nexus
;
980 if (tl_tpg
->tl_nexus
) {
981 pr_debug("tl_tpg->tl_nexus already exists\n");
984 se_tpg
= &tl_tpg
->tl_se_tpg
;
986 tl_nexus
= kzalloc(sizeof(struct tcm_loop_nexus
), GFP_KERNEL
);
988 pr_err("Unable to allocate struct tcm_loop_nexus\n");
992 * Initialize the struct se_session pointer
994 tl_nexus
->se_sess
= transport_init_session();
995 if (IS_ERR(tl_nexus
->se_sess
)) {
996 ret
= PTR_ERR(tl_nexus
->se_sess
);
1000 * Since we are running in 'demo mode' this call with generate a
1001 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
1002 * Initiator port name of the passed configfs group 'name'.
1004 tl_nexus
->se_sess
->se_node_acl
= core_tpg_check_initiator_node_acl(
1005 se_tpg
, (unsigned char *)name
);
1006 if (!tl_nexus
->se_sess
->se_node_acl
) {
1007 transport_free_session(tl_nexus
->se_sess
);
1011 * Now, register the SAS I_T Nexus as active with the call to
1012 * transport_register_session()
1014 __transport_register_session(se_tpg
, tl_nexus
->se_sess
->se_node_acl
,
1015 tl_nexus
->se_sess
, tl_nexus
);
1016 tl_tpg
->tl_nexus
= tl_nexus
;
1017 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
1018 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba
),
1027 static int tcm_loop_drop_nexus(
1028 struct tcm_loop_tpg
*tpg
)
1030 struct se_session
*se_sess
;
1031 struct tcm_loop_nexus
*tl_nexus
;
1033 tl_nexus
= tpg
->tl_nexus
;
1037 se_sess
= tl_nexus
->se_sess
;
1041 if (atomic_read(&tpg
->tl_tpg_port_count
)) {
1042 pr_err("Unable to remove TCM_Loop I_T Nexus with"
1043 " active TPG port count: %d\n",
1044 atomic_read(&tpg
->tl_tpg_port_count
));
1048 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
1049 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg
->tl_hba
),
1050 tl_nexus
->se_sess
->se_node_acl
->initiatorname
);
1052 * Release the SCSI I_T Nexus to the emulated SAS Target Port
1054 transport_deregister_session(tl_nexus
->se_sess
);
1055 tpg
->tl_nexus
= NULL
;
1060 /* End items for tcm_loop_nexus_cit */
1062 static ssize_t
tcm_loop_tpg_show_nexus(
1063 struct se_portal_group
*se_tpg
,
1066 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1067 struct tcm_loop_tpg
, tl_se_tpg
);
1068 struct tcm_loop_nexus
*tl_nexus
;
1071 tl_nexus
= tl_tpg
->tl_nexus
;
1075 ret
= snprintf(page
, PAGE_SIZE
, "%s\n",
1076 tl_nexus
->se_sess
->se_node_acl
->initiatorname
);
1081 static ssize_t
tcm_loop_tpg_store_nexus(
1082 struct se_portal_group
*se_tpg
,
1086 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1087 struct tcm_loop_tpg
, tl_se_tpg
);
1088 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
1089 unsigned char i_port
[TL_WWN_ADDR_LEN
], *ptr
, *port_ptr
;
1092 * Shutdown the active I_T nexus if 'NULL' is passed..
1094 if (!strncmp(page
, "NULL", 4)) {
1095 ret
= tcm_loop_drop_nexus(tl_tpg
);
1096 return (!ret
) ? count
: ret
;
1099 * Otherwise make sure the passed virtual Initiator port WWN matches
1100 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
1101 * tcm_loop_make_nexus()
1103 if (strlen(page
) >= TL_WWN_ADDR_LEN
) {
1104 pr_err("Emulated NAA Sas Address: %s, exceeds"
1105 " max: %d\n", page
, TL_WWN_ADDR_LEN
);
1108 snprintf(&i_port
[0], TL_WWN_ADDR_LEN
, "%s", page
);
1110 ptr
= strstr(i_port
, "naa.");
1112 if (tl_hba
->tl_proto_id
!= SCSI_PROTOCOL_SAS
) {
1113 pr_err("Passed SAS Initiator Port %s does not"
1114 " match target port protoid: %s\n", i_port
,
1115 tcm_loop_dump_proto_id(tl_hba
));
1118 port_ptr
= &i_port
[0];
1121 ptr
= strstr(i_port
, "fc.");
1123 if (tl_hba
->tl_proto_id
!= SCSI_PROTOCOL_FCP
) {
1124 pr_err("Passed FCP Initiator Port %s does not"
1125 " match target port protoid: %s\n", i_port
,
1126 tcm_loop_dump_proto_id(tl_hba
));
1129 port_ptr
= &i_port
[3]; /* Skip over "fc." */
1132 ptr
= strstr(i_port
, "iqn.");
1134 if (tl_hba
->tl_proto_id
!= SCSI_PROTOCOL_ISCSI
) {
1135 pr_err("Passed iSCSI Initiator Port %s does not"
1136 " match target port protoid: %s\n", i_port
,
1137 tcm_loop_dump_proto_id(tl_hba
));
1140 port_ptr
= &i_port
[0];
1143 pr_err("Unable to locate prefix for emulated Initiator Port:"
1147 * Clear any trailing newline for the NAA WWN
1150 if (i_port
[strlen(i_port
)-1] == '\n')
1151 i_port
[strlen(i_port
)-1] = '\0';
1153 ret
= tcm_loop_make_nexus(tl_tpg
, port_ptr
);
1160 TF_TPG_BASE_ATTR(tcm_loop
, nexus
, S_IRUGO
| S_IWUSR
);
1162 static ssize_t
tcm_loop_tpg_show_transport_status(
1163 struct se_portal_group
*se_tpg
,
1166 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1167 struct tcm_loop_tpg
, tl_se_tpg
);
1168 const char *status
= NULL
;
1169 ssize_t ret
= -EINVAL
;
1171 switch (tl_tpg
->tl_transport_status
) {
1172 case TCM_TRANSPORT_ONLINE
:
1175 case TCM_TRANSPORT_OFFLINE
:
1183 ret
= snprintf(page
, PAGE_SIZE
, "%s\n", status
);
1188 static ssize_t
tcm_loop_tpg_store_transport_status(
1189 struct se_portal_group
*se_tpg
,
1193 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1194 struct tcm_loop_tpg
, tl_se_tpg
);
1196 if (!strncmp(page
, "online", 6)) {
1197 tl_tpg
->tl_transport_status
= TCM_TRANSPORT_ONLINE
;
1200 if (!strncmp(page
, "offline", 7)) {
1201 tl_tpg
->tl_transport_status
= TCM_TRANSPORT_OFFLINE
;
1207 TF_TPG_BASE_ATTR(tcm_loop
, transport_status
, S_IRUGO
| S_IWUSR
);
1209 static struct configfs_attribute
*tcm_loop_tpg_attrs
[] = {
1210 &tcm_loop_tpg_nexus
.attr
,
1211 &tcm_loop_tpg_transport_status
.attr
,
1215 /* Start items for tcm_loop_naa_cit */
1217 static struct se_portal_group
*tcm_loop_make_naa_tpg(
1219 struct config_group
*group
,
1222 struct tcm_loop_hba
*tl_hba
= container_of(wwn
,
1223 struct tcm_loop_hba
, tl_hba_wwn
);
1224 struct tcm_loop_tpg
*tl_tpg
;
1225 char *tpgt_str
, *end_ptr
;
1227 unsigned short int tpgt
;
1229 tpgt_str
= strstr(name
, "tpgt_");
1231 pr_err("Unable to locate \"tpgt_#\" directory"
1233 return ERR_PTR(-EINVAL
);
1235 tpgt_str
+= 5; /* Skip ahead of "tpgt_" */
1236 tpgt
= (unsigned short int) simple_strtoul(tpgt_str
, &end_ptr
, 0);
1238 if (tpgt
>= TL_TPGS_PER_HBA
) {
1239 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1240 " %u\n", tpgt
, TL_TPGS_PER_HBA
);
1241 return ERR_PTR(-EINVAL
);
1243 tl_tpg
= &tl_hba
->tl_hba_tpgs
[tpgt
];
1244 tl_tpg
->tl_hba
= tl_hba
;
1245 tl_tpg
->tl_tpgt
= tpgt
;
1247 * Register the tl_tpg as a emulated SAS TCM Target Endpoint
1249 ret
= core_tpg_register(&tcm_loop_fabric_configfs
->tf_ops
,
1250 wwn
, &tl_tpg
->tl_se_tpg
, tl_tpg
,
1251 TRANSPORT_TPG_TYPE_NORMAL
);
1253 return ERR_PTR(-ENOMEM
);
1255 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1256 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba
),
1257 config_item_name(&wwn
->wwn_group
.cg_item
), tpgt
);
1259 return &tl_tpg
->tl_se_tpg
;
1262 static void tcm_loop_drop_naa_tpg(
1263 struct se_portal_group
*se_tpg
)
1265 struct se_wwn
*wwn
= se_tpg
->se_tpg_wwn
;
1266 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1267 struct tcm_loop_tpg
, tl_se_tpg
);
1268 struct tcm_loop_hba
*tl_hba
;
1269 unsigned short tpgt
;
1271 tl_hba
= tl_tpg
->tl_hba
;
1272 tpgt
= tl_tpg
->tl_tpgt
;
1274 * Release the I_T Nexus for the Virtual SAS link if present
1276 tcm_loop_drop_nexus(tl_tpg
);
1278 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1280 core_tpg_deregister(se_tpg
);
1282 tl_tpg
->tl_hba
= NULL
;
1283 tl_tpg
->tl_tpgt
= 0;
1285 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1286 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba
),
1287 config_item_name(&wwn
->wwn_group
.cg_item
), tpgt
);
1290 /* End items for tcm_loop_naa_cit */
1292 /* Start items for tcm_loop_cit */
1294 static struct se_wwn
*tcm_loop_make_scsi_hba(
1295 struct target_fabric_configfs
*tf
,
1296 struct config_group
*group
,
1299 struct tcm_loop_hba
*tl_hba
;
1300 struct Scsi_Host
*sh
;
1304 tl_hba
= kzalloc(sizeof(struct tcm_loop_hba
), GFP_KERNEL
);
1306 pr_err("Unable to allocate struct tcm_loop_hba\n");
1307 return ERR_PTR(-ENOMEM
);
1310 * Determine the emulated Protocol Identifier and Target Port Name
1311 * based on the incoming configfs directory name.
1313 ptr
= strstr(name
, "naa.");
1315 tl_hba
->tl_proto_id
= SCSI_PROTOCOL_SAS
;
1318 ptr
= strstr(name
, "fc.");
1320 tl_hba
->tl_proto_id
= SCSI_PROTOCOL_FCP
;
1321 off
= 3; /* Skip over "fc." */
1324 ptr
= strstr(name
, "iqn.");
1326 pr_err("Unable to locate prefix for emulated Target "
1327 "Port: %s\n", name
);
1331 tl_hba
->tl_proto_id
= SCSI_PROTOCOL_ISCSI
;
1334 if (strlen(name
) >= TL_WWN_ADDR_LEN
) {
1335 pr_err("Emulated NAA %s Address: %s, exceeds"
1336 " max: %d\n", name
, tcm_loop_dump_proto_id(tl_hba
),
1341 snprintf(&tl_hba
->tl_wwn_address
[0], TL_WWN_ADDR_LEN
, "%s", &name
[off
]);
1344 * Call device_register(tl_hba->dev) to register the emulated
1345 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1346 * device_register() callbacks in tcm_loop_driver_probe()
1348 ret
= tcm_loop_setup_hba_bus(tl_hba
, tcm_loop_hba_no_cnt
);
1353 tcm_loop_hba_no_cnt
++;
1354 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1355 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1356 tcm_loop_dump_proto_id(tl_hba
), name
, sh
->host_no
);
1358 return &tl_hba
->tl_hba_wwn
;
1361 return ERR_PTR(ret
);
1364 static void tcm_loop_drop_scsi_hba(
1367 struct tcm_loop_hba
*tl_hba
= container_of(wwn
,
1368 struct tcm_loop_hba
, tl_hba_wwn
);
1370 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1371 " SAS Address: %s at Linux/SCSI Host ID: %d\n",
1372 tl_hba
->tl_wwn_address
, tl_hba
->sh
->host_no
);
1374 * Call device_unregister() on the original tl_hba->dev.
1375 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1378 device_unregister(&tl_hba
->dev
);
1381 /* Start items for tcm_loop_cit */
1382 static ssize_t
tcm_loop_wwn_show_attr_version(
1383 struct target_fabric_configfs
*tf
,
1386 return sprintf(page
, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION
);
1389 TF_WWN_ATTR_RO(tcm_loop
, version
);
1391 static struct configfs_attribute
*tcm_loop_wwn_attrs
[] = {
1392 &tcm_loop_wwn_version
.attr
,
1396 /* End items for tcm_loop_cit */
1398 static int tcm_loop_register_configfs(void)
1400 struct target_fabric_configfs
*fabric
;
1403 * Set the TCM Loop HBA counter to zero
1405 tcm_loop_hba_no_cnt
= 0;
1407 * Register the top level struct config_item_type with TCM core
1409 fabric
= target_fabric_configfs_init(THIS_MODULE
, "loopback");
1410 if (IS_ERR(fabric
)) {
1411 pr_err("tcm_loop_register_configfs() failed!\n");
1412 return PTR_ERR(fabric
);
1415 * Setup the fabric API of function pointers used by target_core_mod
1417 fabric
->tf_ops
.get_fabric_name
= &tcm_loop_get_fabric_name
;
1418 fabric
->tf_ops
.get_fabric_proto_ident
= &tcm_loop_get_fabric_proto_ident
;
1419 fabric
->tf_ops
.tpg_get_wwn
= &tcm_loop_get_endpoint_wwn
;
1420 fabric
->tf_ops
.tpg_get_tag
= &tcm_loop_get_tag
;
1421 fabric
->tf_ops
.tpg_get_default_depth
= &tcm_loop_get_default_depth
;
1422 fabric
->tf_ops
.tpg_get_pr_transport_id
= &tcm_loop_get_pr_transport_id
;
1423 fabric
->tf_ops
.tpg_get_pr_transport_id_len
=
1424 &tcm_loop_get_pr_transport_id_len
;
1425 fabric
->tf_ops
.tpg_parse_pr_out_transport_id
=
1426 &tcm_loop_parse_pr_out_transport_id
;
1427 fabric
->tf_ops
.tpg_check_demo_mode
= &tcm_loop_check_demo_mode
;
1428 fabric
->tf_ops
.tpg_check_demo_mode_cache
=
1429 &tcm_loop_check_demo_mode_cache
;
1430 fabric
->tf_ops
.tpg_check_demo_mode_write_protect
=
1431 &tcm_loop_check_demo_mode_write_protect
;
1432 fabric
->tf_ops
.tpg_check_prod_mode_write_protect
=
1433 &tcm_loop_check_prod_mode_write_protect
;
1435 * The TCM loopback fabric module runs in demo-mode to a local
1436 * virtual SCSI device, so fabric dependent initator ACLs are
1439 fabric
->tf_ops
.tpg_alloc_fabric_acl
= &tcm_loop_tpg_alloc_fabric_acl
;
1440 fabric
->tf_ops
.tpg_release_fabric_acl
=
1441 &tcm_loop_tpg_release_fabric_acl
;
1442 fabric
->tf_ops
.tpg_get_inst_index
= &tcm_loop_get_inst_index
;
1444 * Used for setting up remaining TCM resources in process context
1446 fabric
->tf_ops
.check_stop_free
= &tcm_loop_check_stop_free
;
1447 fabric
->tf_ops
.release_cmd
= &tcm_loop_release_cmd
;
1448 fabric
->tf_ops
.shutdown_session
= &tcm_loop_shutdown_session
;
1449 fabric
->tf_ops
.close_session
= &tcm_loop_close_session
;
1450 fabric
->tf_ops
.sess_get_index
= &tcm_loop_sess_get_index
;
1451 fabric
->tf_ops
.sess_get_initiator_sid
= NULL
;
1452 fabric
->tf_ops
.write_pending
= &tcm_loop_write_pending
;
1453 fabric
->tf_ops
.write_pending_status
= &tcm_loop_write_pending_status
;
1455 * Not used for TCM loopback
1457 fabric
->tf_ops
.set_default_node_attributes
=
1458 &tcm_loop_set_default_node_attributes
;
1459 fabric
->tf_ops
.get_task_tag
= &tcm_loop_get_task_tag
;
1460 fabric
->tf_ops
.get_cmd_state
= &tcm_loop_get_cmd_state
;
1461 fabric
->tf_ops
.queue_data_in
= &tcm_loop_queue_data_in
;
1462 fabric
->tf_ops
.queue_status
= &tcm_loop_queue_status
;
1463 fabric
->tf_ops
.queue_tm_rsp
= &tcm_loop_queue_tm_rsp
;
1464 fabric
->tf_ops
.aborted_task
= &tcm_loop_aborted_task
;
1467 * Setup function pointers for generic logic in target_core_fabric_configfs.c
1469 fabric
->tf_ops
.fabric_make_wwn
= &tcm_loop_make_scsi_hba
;
1470 fabric
->tf_ops
.fabric_drop_wwn
= &tcm_loop_drop_scsi_hba
;
1471 fabric
->tf_ops
.fabric_make_tpg
= &tcm_loop_make_naa_tpg
;
1472 fabric
->tf_ops
.fabric_drop_tpg
= &tcm_loop_drop_naa_tpg
;
1474 * fabric_post_link() and fabric_pre_unlink() are used for
1475 * registration and release of TCM Loop Virtual SCSI LUNs.
1477 fabric
->tf_ops
.fabric_post_link
= &tcm_loop_port_link
;
1478 fabric
->tf_ops
.fabric_pre_unlink
= &tcm_loop_port_unlink
;
1479 fabric
->tf_ops
.fabric_make_np
= NULL
;
1480 fabric
->tf_ops
.fabric_drop_np
= NULL
;
1482 * Setup default attribute lists for various fabric->tf_cit_tmpl
1484 fabric
->tf_cit_tmpl
.tfc_wwn_cit
.ct_attrs
= tcm_loop_wwn_attrs
;
1485 fabric
->tf_cit_tmpl
.tfc_tpg_base_cit
.ct_attrs
= tcm_loop_tpg_attrs
;
1486 fabric
->tf_cit_tmpl
.tfc_tpg_attrib_cit
.ct_attrs
= NULL
;
1487 fabric
->tf_cit_tmpl
.tfc_tpg_param_cit
.ct_attrs
= NULL
;
1488 fabric
->tf_cit_tmpl
.tfc_tpg_np_base_cit
.ct_attrs
= NULL
;
1490 * Once fabric->tf_ops has been setup, now register the fabric for
1493 ret
= target_fabric_configfs_register(fabric
);
1495 pr_err("target_fabric_configfs_register() for"
1496 " TCM_Loop failed!\n");
1497 target_fabric_configfs_free(fabric
);
1501 * Setup our local pointer to *fabric.
1503 tcm_loop_fabric_configfs
= fabric
;
1504 pr_debug("TCM_LOOP[0] - Set fabric ->"
1505 " tcm_loop_fabric_configfs\n");
1509 static void tcm_loop_deregister_configfs(void)
1511 if (!tcm_loop_fabric_configfs
)
1514 target_fabric_configfs_deregister(tcm_loop_fabric_configfs
);
1515 tcm_loop_fabric_configfs
= NULL
;
1516 pr_debug("TCM_LOOP[0] - Cleared"
1517 " tcm_loop_fabric_configfs\n");
1520 static int __init
tcm_loop_fabric_init(void)
1524 tcm_loop_workqueue
= alloc_workqueue("tcm_loop", 0, 0);
1525 if (!tcm_loop_workqueue
)
1528 tcm_loop_cmd_cache
= kmem_cache_create("tcm_loop_cmd_cache",
1529 sizeof(struct tcm_loop_cmd
),
1530 __alignof__(struct tcm_loop_cmd
),
1532 if (!tcm_loop_cmd_cache
) {
1533 pr_debug("kmem_cache_create() for"
1534 " tcm_loop_cmd_cache failed\n");
1535 goto out_destroy_workqueue
;
1538 ret
= tcm_loop_alloc_core_bus();
1540 goto out_destroy_cache
;
1542 ret
= tcm_loop_register_configfs();
1544 goto out_release_core_bus
;
1548 out_release_core_bus
:
1549 tcm_loop_release_core_bus();
1551 kmem_cache_destroy(tcm_loop_cmd_cache
);
1552 out_destroy_workqueue
:
1553 destroy_workqueue(tcm_loop_workqueue
);
1558 static void __exit
tcm_loop_fabric_exit(void)
1560 tcm_loop_deregister_configfs();
1561 tcm_loop_release_core_bus();
1562 kmem_cache_destroy(tcm_loop_cmd_cache
);
1563 destroy_workqueue(tcm_loop_workqueue
);
1566 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1567 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1568 MODULE_LICENSE("GPL");
1569 module_init(tcm_loop_fabric_init
);
1570 module_exit(tcm_loop_fabric_exit
);