1 /*******************************************************************************
3 * This file contains the Linux/SCSI LLD virtual SCSI initiator driver
4 * for emulated SAS initiator ports
6 * © Copyright 2011-2013 Datera, Inc.
8 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
10 * Author: Nicholas A. Bellinger <nab@risingtidesystems.com>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 ****************************************************************************/
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27 #include <linux/types.h>
28 #include <linux/configfs.h>
29 #include <scsi/scsi.h>
30 #include <scsi/scsi_tcq.h>
31 #include <scsi/scsi_host.h>
32 #include <scsi/scsi_device.h>
33 #include <scsi/scsi_cmnd.h>
35 #include <target/target_core_base.h>
36 #include <target/target_core_fabric.h>
37 #include <target/target_core_fabric_configfs.h>
38 #include <target/target_core_configfs.h>
42 #define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev)
44 /* Local pointer to allocated TCM configfs fabric module */
45 static struct target_fabric_configfs
*tcm_loop_fabric_configfs
;
47 static struct workqueue_struct
*tcm_loop_workqueue
;
48 static struct kmem_cache
*tcm_loop_cmd_cache
;
50 static int tcm_loop_hba_no_cnt
;
52 static int tcm_loop_queue_status(struct se_cmd
*se_cmd
);
55 * Called from struct target_core_fabric_ops->check_stop_free()
57 static int tcm_loop_check_stop_free(struct se_cmd
*se_cmd
)
60 * Do not release struct se_cmd's containing a valid TMR
61 * pointer. These will be released directly in tcm_loop_device_reset()
62 * with transport_generic_free_cmd().
64 if (se_cmd
->se_cmd_flags
& SCF_SCSI_TMR_CDB
)
67 * Release the struct se_cmd, which will make a callback to release
68 * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
70 transport_generic_free_cmd(se_cmd
, 0);
74 static void tcm_loop_release_cmd(struct se_cmd
*se_cmd
)
76 struct tcm_loop_cmd
*tl_cmd
= container_of(se_cmd
,
77 struct tcm_loop_cmd
, tl_se_cmd
);
79 kmem_cache_free(tcm_loop_cmd_cache
, tl_cmd
);
82 static int tcm_loop_show_info(struct seq_file
*m
, struct Scsi_Host
*host
)
84 seq_printf(m
, "tcm_loop_proc_info()\n");
88 static int tcm_loop_driver_probe(struct device
*);
89 static int tcm_loop_driver_remove(struct device
*);
91 static int pseudo_lld_bus_match(struct device
*dev
,
92 struct device_driver
*dev_driver
)
97 static struct bus_type tcm_loop_lld_bus
= {
98 .name
= "tcm_loop_bus",
99 .match
= pseudo_lld_bus_match
,
100 .probe
= tcm_loop_driver_probe
,
101 .remove
= tcm_loop_driver_remove
,
104 static struct device_driver tcm_loop_driverfs
= {
106 .bus
= &tcm_loop_lld_bus
,
109 * Used with root_device_register() in tcm_loop_alloc_core_bus() below
111 struct device
*tcm_loop_primary
;
113 static void tcm_loop_submission_work(struct work_struct
*work
)
115 struct tcm_loop_cmd
*tl_cmd
=
116 container_of(work
, struct tcm_loop_cmd
, work
);
117 struct se_cmd
*se_cmd
= &tl_cmd
->tl_se_cmd
;
118 struct scsi_cmnd
*sc
= tl_cmd
->sc
;
119 struct tcm_loop_nexus
*tl_nexus
;
120 struct tcm_loop_hba
*tl_hba
;
121 struct tcm_loop_tpg
*tl_tpg
;
122 struct scatterlist
*sgl_bidi
= NULL
;
123 u32 sgl_bidi_count
= 0, transfer_length
;
126 tl_hba
= *(struct tcm_loop_hba
**)shost_priv(sc
->device
->host
);
127 tl_tpg
= &tl_hba
->tl_hba_tpgs
[sc
->device
->id
];
130 * Ensure that this tl_tpg reference from the incoming sc->device->id
131 * has already been configured via tcm_loop_make_naa_tpg().
133 if (!tl_tpg
->tl_hba
) {
134 set_host_byte(sc
, DID_NO_CONNECT
);
137 if (tl_tpg
->tl_transport_status
== TCM_TRANSPORT_OFFLINE
) {
138 set_host_byte(sc
, DID_TRANSPORT_DISRUPTED
);
141 tl_nexus
= tl_tpg
->tl_nexus
;
143 scmd_printk(KERN_ERR
, sc
, "TCM_Loop I_T Nexus"
144 " does not exist\n");
145 set_host_byte(sc
, DID_ERROR
);
148 if (scsi_bidi_cmnd(sc
)) {
149 struct scsi_data_buffer
*sdb
= scsi_in(sc
);
151 sgl_bidi
= sdb
->table
.sgl
;
152 sgl_bidi_count
= sdb
->table
.nents
;
153 se_cmd
->se_cmd_flags
|= SCF_BIDI
;
157 transfer_length
= scsi_transfer_length(sc
);
158 if (!scsi_prot_sg_count(sc
) &&
159 scsi_get_prot_op(sc
) != SCSI_PROT_NORMAL
) {
160 se_cmd
->prot_pto
= true;
162 * loopback transport doesn't support
163 * WRITE_GENERATE, READ_STRIP protection
164 * information operations, go ahead unprotected.
166 transfer_length
= scsi_bufflen(sc
);
169 rc
= target_submit_cmd_map_sgls(se_cmd
, tl_nexus
->se_sess
, sc
->cmnd
,
170 &tl_cmd
->tl_sense_buf
[0], tl_cmd
->sc
->device
->lun
,
171 transfer_length
, MSG_SIMPLE_TAG
,
172 sc
->sc_data_direction
, 0,
173 scsi_sglist(sc
), scsi_sg_count(sc
),
174 sgl_bidi
, sgl_bidi_count
,
175 scsi_prot_sglist(sc
), scsi_prot_sg_count(sc
));
177 set_host_byte(sc
, DID_NO_CONNECT
);
183 kmem_cache_free(tcm_loop_cmd_cache
, tl_cmd
);
189 * ->queuecommand can be and usually is called from interrupt context, so
190 * defer the actual submission to a workqueue.
192 static int tcm_loop_queuecommand(struct Scsi_Host
*sh
, struct scsi_cmnd
*sc
)
194 struct tcm_loop_cmd
*tl_cmd
;
196 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%llu got CDB: 0x%02x"
197 " scsi_buf_len: %u\n", sc
->device
->host
->host_no
,
198 sc
->device
->id
, sc
->device
->channel
, sc
->device
->lun
,
199 sc
->cmnd
[0], scsi_bufflen(sc
));
201 tl_cmd
= kmem_cache_zalloc(tcm_loop_cmd_cache
, GFP_ATOMIC
);
203 pr_err("Unable to allocate struct tcm_loop_cmd\n");
204 set_host_byte(sc
, DID_ERROR
);
210 tl_cmd
->sc_cmd_tag
= sc
->request
->tag
;
211 INIT_WORK(&tl_cmd
->work
, tcm_loop_submission_work
);
212 queue_work(tcm_loop_workqueue
, &tl_cmd
->work
);
217 * Called from SCSI EH process context to issue a LUN_RESET TMR
218 * to struct scsi_device
220 static int tcm_loop_issue_tmr(struct tcm_loop_tpg
*tl_tpg
,
221 int lun
, int task
, enum tcm_tmreq_table tmr
)
223 struct se_cmd
*se_cmd
= NULL
;
224 struct se_session
*se_sess
;
225 struct se_portal_group
*se_tpg
;
226 struct tcm_loop_nexus
*tl_nexus
;
227 struct tcm_loop_cmd
*tl_cmd
= NULL
;
228 struct tcm_loop_tmr
*tl_tmr
= NULL
;
229 int ret
= TMR_FUNCTION_FAILED
, rc
;
232 * Locate the tl_nexus and se_sess pointers
234 tl_nexus
= tl_tpg
->tl_nexus
;
236 pr_err("Unable to perform device reset without"
237 " active I_T Nexus\n");
241 tl_cmd
= kmem_cache_zalloc(tcm_loop_cmd_cache
, GFP_KERNEL
);
243 pr_err("Unable to allocate memory for tl_cmd\n");
247 tl_tmr
= kzalloc(sizeof(struct tcm_loop_tmr
), GFP_KERNEL
);
249 pr_err("Unable to allocate memory for tl_tmr\n");
252 init_waitqueue_head(&tl_tmr
->tl_tmr_wait
);
254 se_cmd
= &tl_cmd
->tl_se_cmd
;
255 se_tpg
= &tl_tpg
->tl_se_tpg
;
256 se_sess
= tl_tpg
->tl_nexus
->se_sess
;
258 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
260 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
, 0,
261 DMA_NONE
, MSG_SIMPLE_TAG
,
262 &tl_cmd
->tl_sense_buf
[0]);
264 rc
= core_tmr_alloc_req(se_cmd
, tl_tmr
, tmr
, GFP_KERNEL
);
268 if (tmr
== TMR_ABORT_TASK
)
269 se_cmd
->se_tmr_req
->ref_task_tag
= task
;
272 * Locate the underlying TCM struct se_lun
274 if (transport_lookup_tmr_lun(se_cmd
, lun
) < 0) {
275 ret
= TMR_LUN_DOES_NOT_EXIST
;
279 * Queue the TMR to TCM Core and sleep waiting for
280 * tcm_loop_queue_tm_rsp() to wake us up.
282 transport_generic_handle_tmr(se_cmd
);
283 wait_event(tl_tmr
->tl_tmr_wait
, atomic_read(&tl_tmr
->tmr_complete
));
285 * The TMR LUN_RESET has completed, check the response status and
286 * then release allocations.
288 ret
= se_cmd
->se_tmr_req
->response
;
291 transport_generic_free_cmd(se_cmd
, 1);
293 kmem_cache_free(tcm_loop_cmd_cache
, tl_cmd
);
298 static int tcm_loop_abort_task(struct scsi_cmnd
*sc
)
300 struct tcm_loop_hba
*tl_hba
;
301 struct tcm_loop_tpg
*tl_tpg
;
305 * Locate the tcm_loop_hba_t pointer
307 tl_hba
= *(struct tcm_loop_hba
**)shost_priv(sc
->device
->host
);
308 tl_tpg
= &tl_hba
->tl_hba_tpgs
[sc
->device
->id
];
309 ret
= tcm_loop_issue_tmr(tl_tpg
, sc
->device
->lun
,
310 sc
->request
->tag
, TMR_ABORT_TASK
);
311 return (ret
== TMR_FUNCTION_COMPLETE
) ? SUCCESS
: FAILED
;
315 * Called from SCSI EH process context to issue a LUN_RESET TMR
316 * to struct scsi_device
318 static int tcm_loop_device_reset(struct scsi_cmnd
*sc
)
320 struct tcm_loop_hba
*tl_hba
;
321 struct tcm_loop_tpg
*tl_tpg
;
325 * Locate the tcm_loop_hba_t pointer
327 tl_hba
= *(struct tcm_loop_hba
**)shost_priv(sc
->device
->host
);
328 tl_tpg
= &tl_hba
->tl_hba_tpgs
[sc
->device
->id
];
330 ret
= tcm_loop_issue_tmr(tl_tpg
, sc
->device
->lun
,
332 return (ret
== TMR_FUNCTION_COMPLETE
) ? SUCCESS
: FAILED
;
335 static int tcm_loop_target_reset(struct scsi_cmnd
*sc
)
337 struct tcm_loop_hba
*tl_hba
;
338 struct tcm_loop_tpg
*tl_tpg
;
341 * Locate the tcm_loop_hba_t pointer
343 tl_hba
= *(struct tcm_loop_hba
**)shost_priv(sc
->device
->host
);
345 pr_err("Unable to perform device reset without"
346 " active I_T Nexus\n");
350 * Locate the tl_tpg pointer from TargetID in sc->device->id
352 tl_tpg
= &tl_hba
->tl_hba_tpgs
[sc
->device
->id
];
354 tl_tpg
->tl_transport_status
= TCM_TRANSPORT_ONLINE
;
360 static int tcm_loop_slave_alloc(struct scsi_device
*sd
)
362 set_bit(QUEUE_FLAG_BIDI
, &sd
->request_queue
->queue_flags
);
366 static struct scsi_host_template tcm_loop_driver_template
= {
367 .show_info
= tcm_loop_show_info
,
368 .proc_name
= "tcm_loopback",
369 .name
= "TCM_Loopback",
370 .queuecommand
= tcm_loop_queuecommand
,
371 .change_queue_depth
= scsi_change_queue_depth
,
372 .change_queue_type
= scsi_change_queue_type
,
373 .eh_abort_handler
= tcm_loop_abort_task
,
374 .eh_device_reset_handler
= tcm_loop_device_reset
,
375 .eh_target_reset_handler
= tcm_loop_target_reset
,
380 .max_sectors
= 0xFFFF,
381 .use_clustering
= DISABLE_CLUSTERING
,
382 .slave_alloc
= tcm_loop_slave_alloc
,
383 .module
= THIS_MODULE
,
385 .track_queue_depth
= 1,
388 static int tcm_loop_driver_probe(struct device
*dev
)
390 struct tcm_loop_hba
*tl_hba
;
391 struct Scsi_Host
*sh
;
392 int error
, host_prot
;
394 tl_hba
= to_tcm_loop_hba(dev
);
396 sh
= scsi_host_alloc(&tcm_loop_driver_template
,
397 sizeof(struct tcm_loop_hba
));
399 pr_err("Unable to allocate struct scsi_host\n");
405 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
407 *((struct tcm_loop_hba
**)sh
->hostdata
) = tl_hba
;
409 * Setup single ID, Channel and LUN for now..
414 sh
->max_cmd_len
= TL_SCSI_MAX_CMD_LEN
;
416 host_prot
= SHOST_DIF_TYPE1_PROTECTION
| SHOST_DIF_TYPE2_PROTECTION
|
417 SHOST_DIF_TYPE3_PROTECTION
| SHOST_DIX_TYPE1_PROTECTION
|
418 SHOST_DIX_TYPE2_PROTECTION
| SHOST_DIX_TYPE3_PROTECTION
;
420 scsi_host_set_prot(sh
, host_prot
);
421 scsi_host_set_guard(sh
, SHOST_DIX_GUARD_CRC
);
423 error
= scsi_add_host(sh
, &tl_hba
->dev
);
425 pr_err("%s: scsi_add_host failed\n", __func__
);
432 static int tcm_loop_driver_remove(struct device
*dev
)
434 struct tcm_loop_hba
*tl_hba
;
435 struct Scsi_Host
*sh
;
437 tl_hba
= to_tcm_loop_hba(dev
);
440 scsi_remove_host(sh
);
445 static void tcm_loop_release_adapter(struct device
*dev
)
447 struct tcm_loop_hba
*tl_hba
= to_tcm_loop_hba(dev
);
453 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
455 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba
*tl_hba
, int tcm_loop_host_id
)
459 tl_hba
->dev
.bus
= &tcm_loop_lld_bus
;
460 tl_hba
->dev
.parent
= tcm_loop_primary
;
461 tl_hba
->dev
.release
= &tcm_loop_release_adapter
;
462 dev_set_name(&tl_hba
->dev
, "tcm_loop_adapter_%d", tcm_loop_host_id
);
464 ret
= device_register(&tl_hba
->dev
);
466 pr_err("device_register() failed for"
467 " tl_hba->dev: %d\n", ret
);
475 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
478 static int tcm_loop_alloc_core_bus(void)
482 tcm_loop_primary
= root_device_register("tcm_loop_0");
483 if (IS_ERR(tcm_loop_primary
)) {
484 pr_err("Unable to allocate tcm_loop_primary\n");
485 return PTR_ERR(tcm_loop_primary
);
488 ret
= bus_register(&tcm_loop_lld_bus
);
490 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
494 ret
= driver_register(&tcm_loop_driverfs
);
496 pr_err("driver_register() failed for"
497 "tcm_loop_driverfs\n");
501 pr_debug("Initialized TCM Loop Core Bus\n");
505 bus_unregister(&tcm_loop_lld_bus
);
507 root_device_unregister(tcm_loop_primary
);
511 static void tcm_loop_release_core_bus(void)
513 driver_unregister(&tcm_loop_driverfs
);
514 bus_unregister(&tcm_loop_lld_bus
);
515 root_device_unregister(tcm_loop_primary
);
517 pr_debug("Releasing TCM Loop Core BUS\n");
520 static char *tcm_loop_get_fabric_name(void)
525 static u8
tcm_loop_get_fabric_proto_ident(struct se_portal_group
*se_tpg
)
527 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
528 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
530 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
531 * time based on the protocol dependent prefix of the passed configfs group.
533 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric
534 * ProtocolID using target_core_fabric_lib.c symbols.
536 switch (tl_hba
->tl_proto_id
) {
537 case SCSI_PROTOCOL_SAS
:
538 return sas_get_fabric_proto_ident(se_tpg
);
539 case SCSI_PROTOCOL_FCP
:
540 return fc_get_fabric_proto_ident(se_tpg
);
541 case SCSI_PROTOCOL_ISCSI
:
542 return iscsi_get_fabric_proto_ident(se_tpg
);
544 pr_err("Unknown tl_proto_id: 0x%02x, using"
545 " SAS emulation\n", tl_hba
->tl_proto_id
);
549 return sas_get_fabric_proto_ident(se_tpg
);
552 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group
*se_tpg
)
554 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
556 * Return the passed NAA identifier for the SAS Target Port
558 return &tl_tpg
->tl_hba
->tl_wwn_address
[0];
561 static u16
tcm_loop_get_tag(struct se_portal_group
*se_tpg
)
563 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
565 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
566 * to represent the SCSI Target Port.
568 return tl_tpg
->tl_tpgt
;
571 static u32
tcm_loop_get_default_depth(struct se_portal_group
*se_tpg
)
576 static u32
tcm_loop_get_pr_transport_id(
577 struct se_portal_group
*se_tpg
,
578 struct se_node_acl
*se_nacl
,
579 struct t10_pr_registration
*pr_reg
,
583 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
584 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
586 switch (tl_hba
->tl_proto_id
) {
587 case SCSI_PROTOCOL_SAS
:
588 return sas_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
590 case SCSI_PROTOCOL_FCP
:
591 return fc_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
593 case SCSI_PROTOCOL_ISCSI
:
594 return iscsi_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
597 pr_err("Unknown tl_proto_id: 0x%02x, using"
598 " SAS emulation\n", tl_hba
->tl_proto_id
);
602 return sas_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
606 static u32
tcm_loop_get_pr_transport_id_len(
607 struct se_portal_group
*se_tpg
,
608 struct se_node_acl
*se_nacl
,
609 struct t10_pr_registration
*pr_reg
,
612 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
613 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
615 switch (tl_hba
->tl_proto_id
) {
616 case SCSI_PROTOCOL_SAS
:
617 return sas_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
619 case SCSI_PROTOCOL_FCP
:
620 return fc_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
622 case SCSI_PROTOCOL_ISCSI
:
623 return iscsi_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
626 pr_err("Unknown tl_proto_id: 0x%02x, using"
627 " SAS emulation\n", tl_hba
->tl_proto_id
);
631 return sas_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
636 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
637 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
639 static char *tcm_loop_parse_pr_out_transport_id(
640 struct se_portal_group
*se_tpg
,
643 char **port_nexus_ptr
)
645 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
646 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
648 switch (tl_hba
->tl_proto_id
) {
649 case SCSI_PROTOCOL_SAS
:
650 return sas_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
652 case SCSI_PROTOCOL_FCP
:
653 return fc_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
655 case SCSI_PROTOCOL_ISCSI
:
656 return iscsi_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
659 pr_err("Unknown tl_proto_id: 0x%02x, using"
660 " SAS emulation\n", tl_hba
->tl_proto_id
);
664 return sas_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
669 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
670 * based upon the incoming fabric dependent SCSI Initiator Port
672 static int tcm_loop_check_demo_mode(struct se_portal_group
*se_tpg
)
677 static int tcm_loop_check_demo_mode_cache(struct se_portal_group
*se_tpg
)
683 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
684 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
686 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group
*se_tpg
)
692 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
693 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
694 * It has been added here as a nop for target_fabric_tf_ops_check()
696 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group
*se_tpg
)
701 static struct se_node_acl
*tcm_loop_tpg_alloc_fabric_acl(
702 struct se_portal_group
*se_tpg
)
704 struct tcm_loop_nacl
*tl_nacl
;
706 tl_nacl
= kzalloc(sizeof(struct tcm_loop_nacl
), GFP_KERNEL
);
708 pr_err("Unable to allocate struct tcm_loop_nacl\n");
712 return &tl_nacl
->se_node_acl
;
715 static void tcm_loop_tpg_release_fabric_acl(
716 struct se_portal_group
*se_tpg
,
717 struct se_node_acl
*se_nacl
)
719 struct tcm_loop_nacl
*tl_nacl
= container_of(se_nacl
,
720 struct tcm_loop_nacl
, se_node_acl
);
725 static u32
tcm_loop_get_inst_index(struct se_portal_group
*se_tpg
)
730 static u32
tcm_loop_sess_get_index(struct se_session
*se_sess
)
735 static void tcm_loop_set_default_node_attributes(struct se_node_acl
*se_acl
)
740 static u32
tcm_loop_get_task_tag(struct se_cmd
*se_cmd
)
742 struct tcm_loop_cmd
*tl_cmd
= container_of(se_cmd
,
743 struct tcm_loop_cmd
, tl_se_cmd
);
745 return tl_cmd
->sc_cmd_tag
;
748 static int tcm_loop_get_cmd_state(struct se_cmd
*se_cmd
)
750 struct tcm_loop_cmd
*tl_cmd
= container_of(se_cmd
,
751 struct tcm_loop_cmd
, tl_se_cmd
);
753 return tl_cmd
->sc_cmd_state
;
756 static int tcm_loop_shutdown_session(struct se_session
*se_sess
)
761 static void tcm_loop_close_session(struct se_session
*se_sess
)
766 static int tcm_loop_write_pending(struct se_cmd
*se_cmd
)
769 * Since Linux/SCSI has already sent down a struct scsi_cmnd
770 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
771 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
772 * format with transport_generic_map_mem_to_cmd().
774 * We now tell TCM to add this WRITE CDB directly into the TCM storage
775 * object execution queue.
777 target_execute_cmd(se_cmd
);
781 static int tcm_loop_write_pending_status(struct se_cmd
*se_cmd
)
786 static int tcm_loop_queue_data_in(struct se_cmd
*se_cmd
)
788 struct tcm_loop_cmd
*tl_cmd
= container_of(se_cmd
,
789 struct tcm_loop_cmd
, tl_se_cmd
);
790 struct scsi_cmnd
*sc
= tl_cmd
->sc
;
792 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
793 " cdb: 0x%02x\n", sc
, sc
->cmnd
[0]);
795 sc
->result
= SAM_STAT_GOOD
;
796 set_host_byte(sc
, DID_OK
);
797 if ((se_cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) ||
798 (se_cmd
->se_cmd_flags
& SCF_UNDERFLOW_BIT
))
799 scsi_set_resid(sc
, se_cmd
->residual_count
);
804 static int tcm_loop_queue_status(struct se_cmd
*se_cmd
)
806 struct tcm_loop_cmd
*tl_cmd
= container_of(se_cmd
,
807 struct tcm_loop_cmd
, tl_se_cmd
);
808 struct scsi_cmnd
*sc
= tl_cmd
->sc
;
810 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
811 " cdb: 0x%02x\n", sc
, sc
->cmnd
[0]);
813 if (se_cmd
->sense_buffer
&&
814 ((se_cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ||
815 (se_cmd
->se_cmd_flags
& SCF_EMULATED_TASK_SENSE
))) {
817 memcpy(sc
->sense_buffer
, se_cmd
->sense_buffer
,
818 SCSI_SENSE_BUFFERSIZE
);
819 sc
->result
= SAM_STAT_CHECK_CONDITION
;
820 set_driver_byte(sc
, DRIVER_SENSE
);
822 sc
->result
= se_cmd
->scsi_status
;
824 set_host_byte(sc
, DID_OK
);
825 if ((se_cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) ||
826 (se_cmd
->se_cmd_flags
& SCF_UNDERFLOW_BIT
))
827 scsi_set_resid(sc
, se_cmd
->residual_count
);
832 static void tcm_loop_queue_tm_rsp(struct se_cmd
*se_cmd
)
834 struct se_tmr_req
*se_tmr
= se_cmd
->se_tmr_req
;
835 struct tcm_loop_tmr
*tl_tmr
= se_tmr
->fabric_tmr_ptr
;
837 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
838 * and wake up the wait_queue_head_t in tcm_loop_device_reset()
840 atomic_set(&tl_tmr
->tmr_complete
, 1);
841 wake_up(&tl_tmr
->tl_tmr_wait
);
844 static void tcm_loop_aborted_task(struct se_cmd
*se_cmd
)
849 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba
*tl_hba
)
851 switch (tl_hba
->tl_proto_id
) {
852 case SCSI_PROTOCOL_SAS
:
854 case SCSI_PROTOCOL_FCP
:
856 case SCSI_PROTOCOL_ISCSI
:
865 /* Start items for tcm_loop_port_cit */
867 static int tcm_loop_port_link(
868 struct se_portal_group
*se_tpg
,
871 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
872 struct tcm_loop_tpg
, tl_se_tpg
);
873 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
875 atomic_inc_mb(&tl_tpg
->tl_tpg_port_count
);
877 * Add Linux/SCSI struct scsi_device by HCTL
879 scsi_add_device(tl_hba
->sh
, 0, tl_tpg
->tl_tpgt
, lun
->unpacked_lun
);
881 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
885 static void tcm_loop_port_unlink(
886 struct se_portal_group
*se_tpg
,
887 struct se_lun
*se_lun
)
889 struct scsi_device
*sd
;
890 struct tcm_loop_hba
*tl_hba
;
891 struct tcm_loop_tpg
*tl_tpg
;
893 tl_tpg
= container_of(se_tpg
, struct tcm_loop_tpg
, tl_se_tpg
);
894 tl_hba
= tl_tpg
->tl_hba
;
896 sd
= scsi_device_lookup(tl_hba
->sh
, 0, tl_tpg
->tl_tpgt
,
897 se_lun
->unpacked_lun
);
899 pr_err("Unable to locate struct scsi_device for %d:%d:"
900 "%d\n", 0, tl_tpg
->tl_tpgt
, se_lun
->unpacked_lun
);
904 * Remove Linux/SCSI struct scsi_device by HCTL
906 scsi_remove_device(sd
);
909 atomic_dec_mb(&tl_tpg
->tl_tpg_port_count
);
911 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
914 /* End items for tcm_loop_port_cit */
916 /* Start items for tcm_loop_nexus_cit */
918 static int tcm_loop_make_nexus(
919 struct tcm_loop_tpg
*tl_tpg
,
922 struct se_portal_group
*se_tpg
;
923 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
924 struct tcm_loop_nexus
*tl_nexus
;
927 if (tl_tpg
->tl_nexus
) {
928 pr_debug("tl_tpg->tl_nexus already exists\n");
931 se_tpg
= &tl_tpg
->tl_se_tpg
;
933 tl_nexus
= kzalloc(sizeof(struct tcm_loop_nexus
), GFP_KERNEL
);
935 pr_err("Unable to allocate struct tcm_loop_nexus\n");
939 * Initialize the struct se_session pointer
941 tl_nexus
->se_sess
= transport_init_session(TARGET_PROT_ALL
);
942 if (IS_ERR(tl_nexus
->se_sess
)) {
943 ret
= PTR_ERR(tl_nexus
->se_sess
);
947 * Since we are running in 'demo mode' this call with generate a
948 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
949 * Initiator port name of the passed configfs group 'name'.
951 tl_nexus
->se_sess
->se_node_acl
= core_tpg_check_initiator_node_acl(
952 se_tpg
, (unsigned char *)name
);
953 if (!tl_nexus
->se_sess
->se_node_acl
) {
954 transport_free_session(tl_nexus
->se_sess
);
958 * Now, register the SAS I_T Nexus as active with the call to
959 * transport_register_session()
961 __transport_register_session(se_tpg
, tl_nexus
->se_sess
->se_node_acl
,
962 tl_nexus
->se_sess
, tl_nexus
);
963 tl_tpg
->tl_nexus
= tl_nexus
;
964 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
965 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba
),
974 static int tcm_loop_drop_nexus(
975 struct tcm_loop_tpg
*tpg
)
977 struct se_session
*se_sess
;
978 struct tcm_loop_nexus
*tl_nexus
;
980 tl_nexus
= tpg
->tl_nexus
;
984 se_sess
= tl_nexus
->se_sess
;
988 if (atomic_read(&tpg
->tl_tpg_port_count
)) {
989 pr_err("Unable to remove TCM_Loop I_T Nexus with"
990 " active TPG port count: %d\n",
991 atomic_read(&tpg
->tl_tpg_port_count
));
995 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
996 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg
->tl_hba
),
997 tl_nexus
->se_sess
->se_node_acl
->initiatorname
);
999 * Release the SCSI I_T Nexus to the emulated SAS Target Port
1001 transport_deregister_session(tl_nexus
->se_sess
);
1002 tpg
->tl_nexus
= NULL
;
1007 /* End items for tcm_loop_nexus_cit */
1009 static ssize_t
tcm_loop_tpg_show_nexus(
1010 struct se_portal_group
*se_tpg
,
1013 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1014 struct tcm_loop_tpg
, tl_se_tpg
);
1015 struct tcm_loop_nexus
*tl_nexus
;
1018 tl_nexus
= tl_tpg
->tl_nexus
;
1022 ret
= snprintf(page
, PAGE_SIZE
, "%s\n",
1023 tl_nexus
->se_sess
->se_node_acl
->initiatorname
);
1028 static ssize_t
tcm_loop_tpg_store_nexus(
1029 struct se_portal_group
*se_tpg
,
1033 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1034 struct tcm_loop_tpg
, tl_se_tpg
);
1035 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
1036 unsigned char i_port
[TL_WWN_ADDR_LEN
], *ptr
, *port_ptr
;
1039 * Shutdown the active I_T nexus if 'NULL' is passed..
1041 if (!strncmp(page
, "NULL", 4)) {
1042 ret
= tcm_loop_drop_nexus(tl_tpg
);
1043 return (!ret
) ? count
: ret
;
1046 * Otherwise make sure the passed virtual Initiator port WWN matches
1047 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
1048 * tcm_loop_make_nexus()
1050 if (strlen(page
) >= TL_WWN_ADDR_LEN
) {
1051 pr_err("Emulated NAA Sas Address: %s, exceeds"
1052 " max: %d\n", page
, TL_WWN_ADDR_LEN
);
1055 snprintf(&i_port
[0], TL_WWN_ADDR_LEN
, "%s", page
);
1057 ptr
= strstr(i_port
, "naa.");
1059 if (tl_hba
->tl_proto_id
!= SCSI_PROTOCOL_SAS
) {
1060 pr_err("Passed SAS Initiator Port %s does not"
1061 " match target port protoid: %s\n", i_port
,
1062 tcm_loop_dump_proto_id(tl_hba
));
1065 port_ptr
= &i_port
[0];
1068 ptr
= strstr(i_port
, "fc.");
1070 if (tl_hba
->tl_proto_id
!= SCSI_PROTOCOL_FCP
) {
1071 pr_err("Passed FCP Initiator Port %s does not"
1072 " match target port protoid: %s\n", i_port
,
1073 tcm_loop_dump_proto_id(tl_hba
));
1076 port_ptr
= &i_port
[3]; /* Skip over "fc." */
1079 ptr
= strstr(i_port
, "iqn.");
1081 if (tl_hba
->tl_proto_id
!= SCSI_PROTOCOL_ISCSI
) {
1082 pr_err("Passed iSCSI Initiator Port %s does not"
1083 " match target port protoid: %s\n", i_port
,
1084 tcm_loop_dump_proto_id(tl_hba
));
1087 port_ptr
= &i_port
[0];
1090 pr_err("Unable to locate prefix for emulated Initiator Port:"
1094 * Clear any trailing newline for the NAA WWN
1097 if (i_port
[strlen(i_port
)-1] == '\n')
1098 i_port
[strlen(i_port
)-1] = '\0';
1100 ret
= tcm_loop_make_nexus(tl_tpg
, port_ptr
);
1107 TF_TPG_BASE_ATTR(tcm_loop
, nexus
, S_IRUGO
| S_IWUSR
);
1109 static ssize_t
tcm_loop_tpg_show_transport_status(
1110 struct se_portal_group
*se_tpg
,
1113 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1114 struct tcm_loop_tpg
, tl_se_tpg
);
1115 const char *status
= NULL
;
1116 ssize_t ret
= -EINVAL
;
1118 switch (tl_tpg
->tl_transport_status
) {
1119 case TCM_TRANSPORT_ONLINE
:
1122 case TCM_TRANSPORT_OFFLINE
:
1130 ret
= snprintf(page
, PAGE_SIZE
, "%s\n", status
);
1135 static ssize_t
tcm_loop_tpg_store_transport_status(
1136 struct se_portal_group
*se_tpg
,
1140 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1141 struct tcm_loop_tpg
, tl_se_tpg
);
1143 if (!strncmp(page
, "online", 6)) {
1144 tl_tpg
->tl_transport_status
= TCM_TRANSPORT_ONLINE
;
1147 if (!strncmp(page
, "offline", 7)) {
1148 tl_tpg
->tl_transport_status
= TCM_TRANSPORT_OFFLINE
;
1154 TF_TPG_BASE_ATTR(tcm_loop
, transport_status
, S_IRUGO
| S_IWUSR
);
1156 static struct configfs_attribute
*tcm_loop_tpg_attrs
[] = {
1157 &tcm_loop_tpg_nexus
.attr
,
1158 &tcm_loop_tpg_transport_status
.attr
,
1162 /* Start items for tcm_loop_naa_cit */
1164 static struct se_portal_group
*tcm_loop_make_naa_tpg(
1166 struct config_group
*group
,
1169 struct tcm_loop_hba
*tl_hba
= container_of(wwn
,
1170 struct tcm_loop_hba
, tl_hba_wwn
);
1171 struct tcm_loop_tpg
*tl_tpg
;
1172 char *tpgt_str
, *end_ptr
;
1174 unsigned short int tpgt
;
1176 tpgt_str
= strstr(name
, "tpgt_");
1178 pr_err("Unable to locate \"tpgt_#\" directory"
1180 return ERR_PTR(-EINVAL
);
1182 tpgt_str
+= 5; /* Skip ahead of "tpgt_" */
1183 tpgt
= (unsigned short int) simple_strtoul(tpgt_str
, &end_ptr
, 0);
1185 if (tpgt
>= TL_TPGS_PER_HBA
) {
1186 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1187 " %u\n", tpgt
, TL_TPGS_PER_HBA
);
1188 return ERR_PTR(-EINVAL
);
1190 tl_tpg
= &tl_hba
->tl_hba_tpgs
[tpgt
];
1191 tl_tpg
->tl_hba
= tl_hba
;
1192 tl_tpg
->tl_tpgt
= tpgt
;
1194 * Register the tl_tpg as a emulated SAS TCM Target Endpoint
1196 ret
= core_tpg_register(&tcm_loop_fabric_configfs
->tf_ops
,
1197 wwn
, &tl_tpg
->tl_se_tpg
, tl_tpg
,
1198 TRANSPORT_TPG_TYPE_NORMAL
);
1200 return ERR_PTR(-ENOMEM
);
1202 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1203 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba
),
1204 config_item_name(&wwn
->wwn_group
.cg_item
), tpgt
);
1206 return &tl_tpg
->tl_se_tpg
;
1209 static void tcm_loop_drop_naa_tpg(
1210 struct se_portal_group
*se_tpg
)
1212 struct se_wwn
*wwn
= se_tpg
->se_tpg_wwn
;
1213 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1214 struct tcm_loop_tpg
, tl_se_tpg
);
1215 struct tcm_loop_hba
*tl_hba
;
1216 unsigned short tpgt
;
1218 tl_hba
= tl_tpg
->tl_hba
;
1219 tpgt
= tl_tpg
->tl_tpgt
;
1221 * Release the I_T Nexus for the Virtual SAS link if present
1223 tcm_loop_drop_nexus(tl_tpg
);
1225 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1227 core_tpg_deregister(se_tpg
);
1229 tl_tpg
->tl_hba
= NULL
;
1230 tl_tpg
->tl_tpgt
= 0;
1232 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1233 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba
),
1234 config_item_name(&wwn
->wwn_group
.cg_item
), tpgt
);
1237 /* End items for tcm_loop_naa_cit */
1239 /* Start items for tcm_loop_cit */
1241 static struct se_wwn
*tcm_loop_make_scsi_hba(
1242 struct target_fabric_configfs
*tf
,
1243 struct config_group
*group
,
1246 struct tcm_loop_hba
*tl_hba
;
1247 struct Scsi_Host
*sh
;
1251 tl_hba
= kzalloc(sizeof(struct tcm_loop_hba
), GFP_KERNEL
);
1253 pr_err("Unable to allocate struct tcm_loop_hba\n");
1254 return ERR_PTR(-ENOMEM
);
1257 * Determine the emulated Protocol Identifier and Target Port Name
1258 * based on the incoming configfs directory name.
1260 ptr
= strstr(name
, "naa.");
1262 tl_hba
->tl_proto_id
= SCSI_PROTOCOL_SAS
;
1265 ptr
= strstr(name
, "fc.");
1267 tl_hba
->tl_proto_id
= SCSI_PROTOCOL_FCP
;
1268 off
= 3; /* Skip over "fc." */
1271 ptr
= strstr(name
, "iqn.");
1273 pr_err("Unable to locate prefix for emulated Target "
1274 "Port: %s\n", name
);
1278 tl_hba
->tl_proto_id
= SCSI_PROTOCOL_ISCSI
;
1281 if (strlen(name
) >= TL_WWN_ADDR_LEN
) {
1282 pr_err("Emulated NAA %s Address: %s, exceeds"
1283 " max: %d\n", name
, tcm_loop_dump_proto_id(tl_hba
),
1288 snprintf(&tl_hba
->tl_wwn_address
[0], TL_WWN_ADDR_LEN
, "%s", &name
[off
]);
1291 * Call device_register(tl_hba->dev) to register the emulated
1292 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1293 * device_register() callbacks in tcm_loop_driver_probe()
1295 ret
= tcm_loop_setup_hba_bus(tl_hba
, tcm_loop_hba_no_cnt
);
1300 tcm_loop_hba_no_cnt
++;
1301 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1302 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1303 tcm_loop_dump_proto_id(tl_hba
), name
, sh
->host_no
);
1305 return &tl_hba
->tl_hba_wwn
;
1308 return ERR_PTR(ret
);
1311 static void tcm_loop_drop_scsi_hba(
1314 struct tcm_loop_hba
*tl_hba
= container_of(wwn
,
1315 struct tcm_loop_hba
, tl_hba_wwn
);
1317 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1318 " SAS Address: %s at Linux/SCSI Host ID: %d\n",
1319 tl_hba
->tl_wwn_address
, tl_hba
->sh
->host_no
);
1321 * Call device_unregister() on the original tl_hba->dev.
1322 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1325 device_unregister(&tl_hba
->dev
);
1328 /* Start items for tcm_loop_cit */
1329 static ssize_t
tcm_loop_wwn_show_attr_version(
1330 struct target_fabric_configfs
*tf
,
1333 return sprintf(page
, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION
);
1336 TF_WWN_ATTR_RO(tcm_loop
, version
);
1338 static struct configfs_attribute
*tcm_loop_wwn_attrs
[] = {
1339 &tcm_loop_wwn_version
.attr
,
1343 /* End items for tcm_loop_cit */
1345 static int tcm_loop_register_configfs(void)
1347 struct target_fabric_configfs
*fabric
;
1350 * Set the TCM Loop HBA counter to zero
1352 tcm_loop_hba_no_cnt
= 0;
1354 * Register the top level struct config_item_type with TCM core
1356 fabric
= target_fabric_configfs_init(THIS_MODULE
, "loopback");
1357 if (IS_ERR(fabric
)) {
1358 pr_err("tcm_loop_register_configfs() failed!\n");
1359 return PTR_ERR(fabric
);
1362 * Setup the fabric API of function pointers used by target_core_mod
1364 fabric
->tf_ops
.get_fabric_name
= &tcm_loop_get_fabric_name
;
1365 fabric
->tf_ops
.get_fabric_proto_ident
= &tcm_loop_get_fabric_proto_ident
;
1366 fabric
->tf_ops
.tpg_get_wwn
= &tcm_loop_get_endpoint_wwn
;
1367 fabric
->tf_ops
.tpg_get_tag
= &tcm_loop_get_tag
;
1368 fabric
->tf_ops
.tpg_get_default_depth
= &tcm_loop_get_default_depth
;
1369 fabric
->tf_ops
.tpg_get_pr_transport_id
= &tcm_loop_get_pr_transport_id
;
1370 fabric
->tf_ops
.tpg_get_pr_transport_id_len
=
1371 &tcm_loop_get_pr_transport_id_len
;
1372 fabric
->tf_ops
.tpg_parse_pr_out_transport_id
=
1373 &tcm_loop_parse_pr_out_transport_id
;
1374 fabric
->tf_ops
.tpg_check_demo_mode
= &tcm_loop_check_demo_mode
;
1375 fabric
->tf_ops
.tpg_check_demo_mode_cache
=
1376 &tcm_loop_check_demo_mode_cache
;
1377 fabric
->tf_ops
.tpg_check_demo_mode_write_protect
=
1378 &tcm_loop_check_demo_mode_write_protect
;
1379 fabric
->tf_ops
.tpg_check_prod_mode_write_protect
=
1380 &tcm_loop_check_prod_mode_write_protect
;
1382 * The TCM loopback fabric module runs in demo-mode to a local
1383 * virtual SCSI device, so fabric dependent initator ACLs are
1386 fabric
->tf_ops
.tpg_alloc_fabric_acl
= &tcm_loop_tpg_alloc_fabric_acl
;
1387 fabric
->tf_ops
.tpg_release_fabric_acl
=
1388 &tcm_loop_tpg_release_fabric_acl
;
1389 fabric
->tf_ops
.tpg_get_inst_index
= &tcm_loop_get_inst_index
;
1391 * Used for setting up remaining TCM resources in process context
1393 fabric
->tf_ops
.check_stop_free
= &tcm_loop_check_stop_free
;
1394 fabric
->tf_ops
.release_cmd
= &tcm_loop_release_cmd
;
1395 fabric
->tf_ops
.shutdown_session
= &tcm_loop_shutdown_session
;
1396 fabric
->tf_ops
.close_session
= &tcm_loop_close_session
;
1397 fabric
->tf_ops
.sess_get_index
= &tcm_loop_sess_get_index
;
1398 fabric
->tf_ops
.sess_get_initiator_sid
= NULL
;
1399 fabric
->tf_ops
.write_pending
= &tcm_loop_write_pending
;
1400 fabric
->tf_ops
.write_pending_status
= &tcm_loop_write_pending_status
;
1402 * Not used for TCM loopback
1404 fabric
->tf_ops
.set_default_node_attributes
=
1405 &tcm_loop_set_default_node_attributes
;
1406 fabric
->tf_ops
.get_task_tag
= &tcm_loop_get_task_tag
;
1407 fabric
->tf_ops
.get_cmd_state
= &tcm_loop_get_cmd_state
;
1408 fabric
->tf_ops
.queue_data_in
= &tcm_loop_queue_data_in
;
1409 fabric
->tf_ops
.queue_status
= &tcm_loop_queue_status
;
1410 fabric
->tf_ops
.queue_tm_rsp
= &tcm_loop_queue_tm_rsp
;
1411 fabric
->tf_ops
.aborted_task
= &tcm_loop_aborted_task
;
1414 * Setup function pointers for generic logic in target_core_fabric_configfs.c
1416 fabric
->tf_ops
.fabric_make_wwn
= &tcm_loop_make_scsi_hba
;
1417 fabric
->tf_ops
.fabric_drop_wwn
= &tcm_loop_drop_scsi_hba
;
1418 fabric
->tf_ops
.fabric_make_tpg
= &tcm_loop_make_naa_tpg
;
1419 fabric
->tf_ops
.fabric_drop_tpg
= &tcm_loop_drop_naa_tpg
;
1421 * fabric_post_link() and fabric_pre_unlink() are used for
1422 * registration and release of TCM Loop Virtual SCSI LUNs.
1424 fabric
->tf_ops
.fabric_post_link
= &tcm_loop_port_link
;
1425 fabric
->tf_ops
.fabric_pre_unlink
= &tcm_loop_port_unlink
;
1426 fabric
->tf_ops
.fabric_make_np
= NULL
;
1427 fabric
->tf_ops
.fabric_drop_np
= NULL
;
1429 * Setup default attribute lists for various fabric->tf_cit_tmpl
1431 fabric
->tf_cit_tmpl
.tfc_wwn_cit
.ct_attrs
= tcm_loop_wwn_attrs
;
1432 fabric
->tf_cit_tmpl
.tfc_tpg_base_cit
.ct_attrs
= tcm_loop_tpg_attrs
;
1433 fabric
->tf_cit_tmpl
.tfc_tpg_attrib_cit
.ct_attrs
= NULL
;
1434 fabric
->tf_cit_tmpl
.tfc_tpg_param_cit
.ct_attrs
= NULL
;
1435 fabric
->tf_cit_tmpl
.tfc_tpg_np_base_cit
.ct_attrs
= NULL
;
1437 * Once fabric->tf_ops has been setup, now register the fabric for
1440 ret
= target_fabric_configfs_register(fabric
);
1442 pr_err("target_fabric_configfs_register() for"
1443 " TCM_Loop failed!\n");
1444 target_fabric_configfs_free(fabric
);
1448 * Setup our local pointer to *fabric.
1450 tcm_loop_fabric_configfs
= fabric
;
1451 pr_debug("TCM_LOOP[0] - Set fabric ->"
1452 " tcm_loop_fabric_configfs\n");
1456 static void tcm_loop_deregister_configfs(void)
1458 if (!tcm_loop_fabric_configfs
)
1461 target_fabric_configfs_deregister(tcm_loop_fabric_configfs
);
1462 tcm_loop_fabric_configfs
= NULL
;
1463 pr_debug("TCM_LOOP[0] - Cleared"
1464 " tcm_loop_fabric_configfs\n");
1467 static int __init
tcm_loop_fabric_init(void)
1471 tcm_loop_workqueue
= alloc_workqueue("tcm_loop", 0, 0);
1472 if (!tcm_loop_workqueue
)
1475 tcm_loop_cmd_cache
= kmem_cache_create("tcm_loop_cmd_cache",
1476 sizeof(struct tcm_loop_cmd
),
1477 __alignof__(struct tcm_loop_cmd
),
1479 if (!tcm_loop_cmd_cache
) {
1480 pr_debug("kmem_cache_create() for"
1481 " tcm_loop_cmd_cache failed\n");
1482 goto out_destroy_workqueue
;
1485 ret
= tcm_loop_alloc_core_bus();
1487 goto out_destroy_cache
;
1489 ret
= tcm_loop_register_configfs();
1491 goto out_release_core_bus
;
1495 out_release_core_bus
:
1496 tcm_loop_release_core_bus();
1498 kmem_cache_destroy(tcm_loop_cmd_cache
);
1499 out_destroy_workqueue
:
1500 destroy_workqueue(tcm_loop_workqueue
);
1505 static void __exit
tcm_loop_fabric_exit(void)
1507 tcm_loop_deregister_configfs();
1508 tcm_loop_release_core_bus();
1509 kmem_cache_destroy(tcm_loop_cmd_cache
);
1510 destroy_workqueue(tcm_loop_workqueue
);
1513 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1514 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1515 MODULE_LICENSE("GPL");
1516 module_init(tcm_loop_fabric_init
);
1517 module_exit(tcm_loop_fabric_exit
);