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, transfer_length
;
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 transfer_length
= scsi_transfer_length(sc
);
217 if (!scsi_prot_sg_count(sc
) &&
218 scsi_get_prot_op(sc
) != SCSI_PROT_NORMAL
) {
219 se_cmd
->prot_pto
= true;
221 * loopback transport doesn't support
222 * WRITE_GENERATE, READ_STRIP protection
223 * information operations, go ahead unprotected.
225 transfer_length
= scsi_bufflen(sc
);
228 rc
= target_submit_cmd_map_sgls(se_cmd
, tl_nexus
->se_sess
, sc
->cmnd
,
229 &tl_cmd
->tl_sense_buf
[0], tl_cmd
->sc
->device
->lun
,
230 transfer_length
, tcm_loop_sam_attr(sc
),
231 sc
->sc_data_direction
, 0,
232 scsi_sglist(sc
), scsi_sg_count(sc
),
233 sgl_bidi
, sgl_bidi_count
,
234 scsi_prot_sglist(sc
), scsi_prot_sg_count(sc
));
236 set_host_byte(sc
, DID_NO_CONNECT
);
242 kmem_cache_free(tcm_loop_cmd_cache
, tl_cmd
);
248 * ->queuecommand can be and usually is called from interrupt context, so
249 * defer the actual submission to a workqueue.
251 static int tcm_loop_queuecommand(struct Scsi_Host
*sh
, struct scsi_cmnd
*sc
)
253 struct tcm_loop_cmd
*tl_cmd
;
255 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%llu got CDB: 0x%02x"
256 " scsi_buf_len: %u\n", sc
->device
->host
->host_no
,
257 sc
->device
->id
, sc
->device
->channel
, sc
->device
->lun
,
258 sc
->cmnd
[0], scsi_bufflen(sc
));
260 tl_cmd
= kmem_cache_zalloc(tcm_loop_cmd_cache
, GFP_ATOMIC
);
262 pr_err("Unable to allocate struct tcm_loop_cmd\n");
263 set_host_byte(sc
, DID_ERROR
);
269 tl_cmd
->sc_cmd_tag
= sc
->tag
;
270 INIT_WORK(&tl_cmd
->work
, tcm_loop_submission_work
);
271 queue_work(tcm_loop_workqueue
, &tl_cmd
->work
);
276 * Called from SCSI EH process context to issue a LUN_RESET TMR
277 * to struct scsi_device
279 static int tcm_loop_issue_tmr(struct tcm_loop_tpg
*tl_tpg
,
280 struct tcm_loop_nexus
*tl_nexus
,
281 int lun
, int task
, enum tcm_tmreq_table tmr
)
283 struct se_cmd
*se_cmd
= NULL
;
284 struct se_session
*se_sess
;
285 struct se_portal_group
*se_tpg
;
286 struct tcm_loop_cmd
*tl_cmd
= NULL
;
287 struct tcm_loop_tmr
*tl_tmr
= NULL
;
288 int ret
= TMR_FUNCTION_FAILED
, rc
;
290 tl_cmd
= kmem_cache_zalloc(tcm_loop_cmd_cache
, GFP_KERNEL
);
292 pr_err("Unable to allocate memory for tl_cmd\n");
296 tl_tmr
= kzalloc(sizeof(struct tcm_loop_tmr
), GFP_KERNEL
);
298 pr_err("Unable to allocate memory for tl_tmr\n");
301 init_waitqueue_head(&tl_tmr
->tl_tmr_wait
);
303 se_cmd
= &tl_cmd
->tl_se_cmd
;
304 se_tpg
= &tl_tpg
->tl_se_tpg
;
305 se_sess
= tl_nexus
->se_sess
;
307 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
309 transport_init_se_cmd(se_cmd
, se_tpg
->se_tpg_tfo
, se_sess
, 0,
310 DMA_NONE
, MSG_SIMPLE_TAG
,
311 &tl_cmd
->tl_sense_buf
[0]);
313 rc
= core_tmr_alloc_req(se_cmd
, tl_tmr
, tmr
, GFP_KERNEL
);
317 if (tmr
== TMR_ABORT_TASK
)
318 se_cmd
->se_tmr_req
->ref_task_tag
= task
;
321 * Locate the underlying TCM struct se_lun
323 if (transport_lookup_tmr_lun(se_cmd
, lun
) < 0) {
324 ret
= TMR_LUN_DOES_NOT_EXIST
;
328 * Queue the TMR to TCM Core and sleep waiting for
329 * tcm_loop_queue_tm_rsp() to wake us up.
331 transport_generic_handle_tmr(se_cmd
);
332 wait_event(tl_tmr
->tl_tmr_wait
, atomic_read(&tl_tmr
->tmr_complete
));
334 * The TMR LUN_RESET has completed, check the response status and
335 * then release allocations.
337 ret
= se_cmd
->se_tmr_req
->response
;
340 transport_generic_free_cmd(se_cmd
, 1);
342 kmem_cache_free(tcm_loop_cmd_cache
, tl_cmd
);
347 static int tcm_loop_abort_task(struct scsi_cmnd
*sc
)
349 struct tcm_loop_hba
*tl_hba
;
350 struct tcm_loop_nexus
*tl_nexus
;
351 struct tcm_loop_tpg
*tl_tpg
;
355 * Locate the tcm_loop_hba_t pointer
357 tl_hba
= *(struct tcm_loop_hba
**)shost_priv(sc
->device
->host
);
359 * Locate the tl_nexus and se_sess pointers
361 tl_nexus
= tl_hba
->tl_nexus
;
363 pr_err("Unable to perform device reset without"
364 " active I_T Nexus\n");
369 * Locate the tl_tpg pointer from TargetID in sc->device->id
371 tl_tpg
= &tl_hba
->tl_hba_tpgs
[sc
->device
->id
];
372 ret
= tcm_loop_issue_tmr(tl_tpg
, tl_nexus
, sc
->device
->lun
,
373 sc
->tag
, TMR_ABORT_TASK
);
374 return (ret
== TMR_FUNCTION_COMPLETE
) ? SUCCESS
: FAILED
;
378 * Called from SCSI EH process context to issue a LUN_RESET TMR
379 * to struct scsi_device
381 static int tcm_loop_device_reset(struct scsi_cmnd
*sc
)
383 struct tcm_loop_hba
*tl_hba
;
384 struct tcm_loop_nexus
*tl_nexus
;
385 struct tcm_loop_tpg
*tl_tpg
;
389 * Locate the tcm_loop_hba_t pointer
391 tl_hba
= *(struct tcm_loop_hba
**)shost_priv(sc
->device
->host
);
393 * Locate the tl_nexus and se_sess pointers
395 tl_nexus
= tl_hba
->tl_nexus
;
397 pr_err("Unable to perform device reset without"
398 " active I_T Nexus\n");
402 * Locate the tl_tpg pointer from TargetID in sc->device->id
404 tl_tpg
= &tl_hba
->tl_hba_tpgs
[sc
->device
->id
];
405 ret
= tcm_loop_issue_tmr(tl_tpg
, tl_nexus
, sc
->device
->lun
,
407 return (ret
== TMR_FUNCTION_COMPLETE
) ? SUCCESS
: FAILED
;
410 static int tcm_loop_target_reset(struct scsi_cmnd
*sc
)
412 struct tcm_loop_hba
*tl_hba
;
413 struct tcm_loop_tpg
*tl_tpg
;
416 * Locate the tcm_loop_hba_t pointer
418 tl_hba
= *(struct tcm_loop_hba
**)shost_priv(sc
->device
->host
);
420 pr_err("Unable to perform device reset without"
421 " active I_T Nexus\n");
425 * Locate the tl_tpg pointer from TargetID in sc->device->id
427 tl_tpg
= &tl_hba
->tl_hba_tpgs
[sc
->device
->id
];
429 tl_tpg
->tl_transport_status
= TCM_TRANSPORT_ONLINE
;
435 static int tcm_loop_slave_alloc(struct scsi_device
*sd
)
437 set_bit(QUEUE_FLAG_BIDI
, &sd
->request_queue
->queue_flags
);
441 static int tcm_loop_slave_configure(struct scsi_device
*sd
)
443 if (sd
->tagged_supported
) {
444 scsi_activate_tcq(sd
, sd
->queue_depth
);
445 scsi_adjust_queue_depth(sd
, MSG_SIMPLE_TAG
,
446 sd
->host
->cmd_per_lun
);
448 scsi_adjust_queue_depth(sd
, 0,
449 sd
->host
->cmd_per_lun
);
455 static struct scsi_host_template tcm_loop_driver_template
= {
456 .show_info
= tcm_loop_show_info
,
457 .proc_name
= "tcm_loopback",
458 .name
= "TCM_Loopback",
459 .queuecommand
= tcm_loop_queuecommand
,
460 .change_queue_depth
= tcm_loop_change_queue_depth
,
461 .change_queue_type
= tcm_loop_change_queue_type
,
462 .eh_abort_handler
= tcm_loop_abort_task
,
463 .eh_device_reset_handler
= tcm_loop_device_reset
,
464 .eh_target_reset_handler
= tcm_loop_target_reset
,
469 .max_sectors
= 0xFFFF,
470 .use_clustering
= DISABLE_CLUSTERING
,
471 .slave_alloc
= tcm_loop_slave_alloc
,
472 .slave_configure
= tcm_loop_slave_configure
,
473 .module
= THIS_MODULE
,
476 static int tcm_loop_driver_probe(struct device
*dev
)
478 struct tcm_loop_hba
*tl_hba
;
479 struct Scsi_Host
*sh
;
480 int error
, host_prot
;
482 tl_hba
= to_tcm_loop_hba(dev
);
484 sh
= scsi_host_alloc(&tcm_loop_driver_template
,
485 sizeof(struct tcm_loop_hba
));
487 pr_err("Unable to allocate struct scsi_host\n");
493 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
495 *((struct tcm_loop_hba
**)sh
->hostdata
) = tl_hba
;
497 * Setup single ID, Channel and LUN for now..
502 sh
->max_cmd_len
= TL_SCSI_MAX_CMD_LEN
;
504 host_prot
= SHOST_DIF_TYPE1_PROTECTION
| SHOST_DIF_TYPE2_PROTECTION
|
505 SHOST_DIF_TYPE3_PROTECTION
| SHOST_DIX_TYPE1_PROTECTION
|
506 SHOST_DIX_TYPE2_PROTECTION
| SHOST_DIX_TYPE3_PROTECTION
;
508 scsi_host_set_prot(sh
, host_prot
);
509 scsi_host_set_guard(sh
, SHOST_DIX_GUARD_CRC
);
511 error
= scsi_add_host(sh
, &tl_hba
->dev
);
513 pr_err("%s: scsi_add_host failed\n", __func__
);
520 static int tcm_loop_driver_remove(struct device
*dev
)
522 struct tcm_loop_hba
*tl_hba
;
523 struct Scsi_Host
*sh
;
525 tl_hba
= to_tcm_loop_hba(dev
);
528 scsi_remove_host(sh
);
533 static void tcm_loop_release_adapter(struct device
*dev
)
535 struct tcm_loop_hba
*tl_hba
= to_tcm_loop_hba(dev
);
541 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
543 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba
*tl_hba
, int tcm_loop_host_id
)
547 tl_hba
->dev
.bus
= &tcm_loop_lld_bus
;
548 tl_hba
->dev
.parent
= tcm_loop_primary
;
549 tl_hba
->dev
.release
= &tcm_loop_release_adapter
;
550 dev_set_name(&tl_hba
->dev
, "tcm_loop_adapter_%d", tcm_loop_host_id
);
552 ret
= device_register(&tl_hba
->dev
);
554 pr_err("device_register() failed for"
555 " tl_hba->dev: %d\n", ret
);
563 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
566 static int tcm_loop_alloc_core_bus(void)
570 tcm_loop_primary
= root_device_register("tcm_loop_0");
571 if (IS_ERR(tcm_loop_primary
)) {
572 pr_err("Unable to allocate tcm_loop_primary\n");
573 return PTR_ERR(tcm_loop_primary
);
576 ret
= bus_register(&tcm_loop_lld_bus
);
578 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
582 ret
= driver_register(&tcm_loop_driverfs
);
584 pr_err("driver_register() failed for"
585 "tcm_loop_driverfs\n");
589 pr_debug("Initialized TCM Loop Core Bus\n");
593 bus_unregister(&tcm_loop_lld_bus
);
595 root_device_unregister(tcm_loop_primary
);
599 static void tcm_loop_release_core_bus(void)
601 driver_unregister(&tcm_loop_driverfs
);
602 bus_unregister(&tcm_loop_lld_bus
);
603 root_device_unregister(tcm_loop_primary
);
605 pr_debug("Releasing TCM Loop Core BUS\n");
608 static char *tcm_loop_get_fabric_name(void)
613 static u8
tcm_loop_get_fabric_proto_ident(struct se_portal_group
*se_tpg
)
615 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
616 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
618 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
619 * time based on the protocol dependent prefix of the passed configfs group.
621 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric
622 * ProtocolID using target_core_fabric_lib.c symbols.
624 switch (tl_hba
->tl_proto_id
) {
625 case SCSI_PROTOCOL_SAS
:
626 return sas_get_fabric_proto_ident(se_tpg
);
627 case SCSI_PROTOCOL_FCP
:
628 return fc_get_fabric_proto_ident(se_tpg
);
629 case SCSI_PROTOCOL_ISCSI
:
630 return iscsi_get_fabric_proto_ident(se_tpg
);
632 pr_err("Unknown tl_proto_id: 0x%02x, using"
633 " SAS emulation\n", tl_hba
->tl_proto_id
);
637 return sas_get_fabric_proto_ident(se_tpg
);
640 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group
*se_tpg
)
642 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
644 * Return the passed NAA identifier for the SAS Target Port
646 return &tl_tpg
->tl_hba
->tl_wwn_address
[0];
649 static u16
tcm_loop_get_tag(struct se_portal_group
*se_tpg
)
651 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
653 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
654 * to represent the SCSI Target Port.
656 return tl_tpg
->tl_tpgt
;
659 static u32
tcm_loop_get_default_depth(struct se_portal_group
*se_tpg
)
664 static u32
tcm_loop_get_pr_transport_id(
665 struct se_portal_group
*se_tpg
,
666 struct se_node_acl
*se_nacl
,
667 struct t10_pr_registration
*pr_reg
,
671 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
672 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
674 switch (tl_hba
->tl_proto_id
) {
675 case SCSI_PROTOCOL_SAS
:
676 return sas_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
678 case SCSI_PROTOCOL_FCP
:
679 return fc_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
681 case SCSI_PROTOCOL_ISCSI
:
682 return iscsi_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
685 pr_err("Unknown tl_proto_id: 0x%02x, using"
686 " SAS emulation\n", tl_hba
->tl_proto_id
);
690 return sas_get_pr_transport_id(se_tpg
, se_nacl
, pr_reg
,
694 static u32
tcm_loop_get_pr_transport_id_len(
695 struct se_portal_group
*se_tpg
,
696 struct se_node_acl
*se_nacl
,
697 struct t10_pr_registration
*pr_reg
,
700 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
701 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
703 switch (tl_hba
->tl_proto_id
) {
704 case SCSI_PROTOCOL_SAS
:
705 return sas_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
707 case SCSI_PROTOCOL_FCP
:
708 return fc_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
710 case SCSI_PROTOCOL_ISCSI
:
711 return iscsi_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
714 pr_err("Unknown tl_proto_id: 0x%02x, using"
715 " SAS emulation\n", tl_hba
->tl_proto_id
);
719 return sas_get_pr_transport_id_len(se_tpg
, se_nacl
, pr_reg
,
724 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
725 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
727 static char *tcm_loop_parse_pr_out_transport_id(
728 struct se_portal_group
*se_tpg
,
731 char **port_nexus_ptr
)
733 struct tcm_loop_tpg
*tl_tpg
= se_tpg
->se_tpg_fabric_ptr
;
734 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
736 switch (tl_hba
->tl_proto_id
) {
737 case SCSI_PROTOCOL_SAS
:
738 return sas_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
740 case SCSI_PROTOCOL_FCP
:
741 return fc_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
743 case SCSI_PROTOCOL_ISCSI
:
744 return iscsi_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
747 pr_err("Unknown tl_proto_id: 0x%02x, using"
748 " SAS emulation\n", tl_hba
->tl_proto_id
);
752 return sas_parse_pr_out_transport_id(se_tpg
, buf
, out_tid_len
,
757 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
758 * based upon the incoming fabric dependent SCSI Initiator Port
760 static int tcm_loop_check_demo_mode(struct se_portal_group
*se_tpg
)
765 static int tcm_loop_check_demo_mode_cache(struct se_portal_group
*se_tpg
)
771 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
772 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
774 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group
*se_tpg
)
780 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
781 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
782 * It has been added here as a nop for target_fabric_tf_ops_check()
784 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group
*se_tpg
)
789 static struct se_node_acl
*tcm_loop_tpg_alloc_fabric_acl(
790 struct se_portal_group
*se_tpg
)
792 struct tcm_loop_nacl
*tl_nacl
;
794 tl_nacl
= kzalloc(sizeof(struct tcm_loop_nacl
), GFP_KERNEL
);
796 pr_err("Unable to allocate struct tcm_loop_nacl\n");
800 return &tl_nacl
->se_node_acl
;
803 static void tcm_loop_tpg_release_fabric_acl(
804 struct se_portal_group
*se_tpg
,
805 struct se_node_acl
*se_nacl
)
807 struct tcm_loop_nacl
*tl_nacl
= container_of(se_nacl
,
808 struct tcm_loop_nacl
, se_node_acl
);
813 static u32
tcm_loop_get_inst_index(struct se_portal_group
*se_tpg
)
818 static u32
tcm_loop_sess_get_index(struct se_session
*se_sess
)
823 static void tcm_loop_set_default_node_attributes(struct se_node_acl
*se_acl
)
828 static u32
tcm_loop_get_task_tag(struct se_cmd
*se_cmd
)
830 struct tcm_loop_cmd
*tl_cmd
= container_of(se_cmd
,
831 struct tcm_loop_cmd
, tl_se_cmd
);
833 return tl_cmd
->sc_cmd_tag
;
836 static int tcm_loop_get_cmd_state(struct se_cmd
*se_cmd
)
838 struct tcm_loop_cmd
*tl_cmd
= container_of(se_cmd
,
839 struct tcm_loop_cmd
, tl_se_cmd
);
841 return tl_cmd
->sc_cmd_state
;
844 static int tcm_loop_shutdown_session(struct se_session
*se_sess
)
849 static void tcm_loop_close_session(struct se_session
*se_sess
)
854 static int tcm_loop_write_pending(struct se_cmd
*se_cmd
)
857 * Since Linux/SCSI has already sent down a struct scsi_cmnd
858 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
859 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
860 * format with transport_generic_map_mem_to_cmd().
862 * We now tell TCM to add this WRITE CDB directly into the TCM storage
863 * object execution queue.
865 target_execute_cmd(se_cmd
);
869 static int tcm_loop_write_pending_status(struct se_cmd
*se_cmd
)
874 static int tcm_loop_queue_data_in(struct se_cmd
*se_cmd
)
876 struct tcm_loop_cmd
*tl_cmd
= container_of(se_cmd
,
877 struct tcm_loop_cmd
, tl_se_cmd
);
878 struct scsi_cmnd
*sc
= tl_cmd
->sc
;
880 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
881 " cdb: 0x%02x\n", sc
, sc
->cmnd
[0]);
883 sc
->result
= SAM_STAT_GOOD
;
884 set_host_byte(sc
, DID_OK
);
885 if ((se_cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) ||
886 (se_cmd
->se_cmd_flags
& SCF_UNDERFLOW_BIT
))
887 scsi_set_resid(sc
, se_cmd
->residual_count
);
892 static int tcm_loop_queue_status(struct se_cmd
*se_cmd
)
894 struct tcm_loop_cmd
*tl_cmd
= container_of(se_cmd
,
895 struct tcm_loop_cmd
, tl_se_cmd
);
896 struct scsi_cmnd
*sc
= tl_cmd
->sc
;
898 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
899 " cdb: 0x%02x\n", sc
, sc
->cmnd
[0]);
901 if (se_cmd
->sense_buffer
&&
902 ((se_cmd
->se_cmd_flags
& SCF_TRANSPORT_TASK_SENSE
) ||
903 (se_cmd
->se_cmd_flags
& SCF_EMULATED_TASK_SENSE
))) {
905 memcpy(sc
->sense_buffer
, se_cmd
->sense_buffer
,
906 SCSI_SENSE_BUFFERSIZE
);
907 sc
->result
= SAM_STAT_CHECK_CONDITION
;
908 set_driver_byte(sc
, DRIVER_SENSE
);
910 sc
->result
= se_cmd
->scsi_status
;
912 set_host_byte(sc
, DID_OK
);
913 if ((se_cmd
->se_cmd_flags
& SCF_OVERFLOW_BIT
) ||
914 (se_cmd
->se_cmd_flags
& SCF_UNDERFLOW_BIT
))
915 scsi_set_resid(sc
, se_cmd
->residual_count
);
920 static void tcm_loop_queue_tm_rsp(struct se_cmd
*se_cmd
)
922 struct se_tmr_req
*se_tmr
= se_cmd
->se_tmr_req
;
923 struct tcm_loop_tmr
*tl_tmr
= se_tmr
->fabric_tmr_ptr
;
925 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
926 * and wake up the wait_queue_head_t in tcm_loop_device_reset()
928 atomic_set(&tl_tmr
->tmr_complete
, 1);
929 wake_up(&tl_tmr
->tl_tmr_wait
);
932 static void tcm_loop_aborted_task(struct se_cmd
*se_cmd
)
937 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba
*tl_hba
)
939 switch (tl_hba
->tl_proto_id
) {
940 case SCSI_PROTOCOL_SAS
:
942 case SCSI_PROTOCOL_FCP
:
944 case SCSI_PROTOCOL_ISCSI
:
953 /* Start items for tcm_loop_port_cit */
955 static int tcm_loop_port_link(
956 struct se_portal_group
*se_tpg
,
959 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
960 struct tcm_loop_tpg
, tl_se_tpg
);
961 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
963 atomic_inc_mb(&tl_tpg
->tl_tpg_port_count
);
965 * Add Linux/SCSI struct scsi_device by HCTL
967 scsi_add_device(tl_hba
->sh
, 0, tl_tpg
->tl_tpgt
, lun
->unpacked_lun
);
969 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
973 static void tcm_loop_port_unlink(
974 struct se_portal_group
*se_tpg
,
975 struct se_lun
*se_lun
)
977 struct scsi_device
*sd
;
978 struct tcm_loop_hba
*tl_hba
;
979 struct tcm_loop_tpg
*tl_tpg
;
981 tl_tpg
= container_of(se_tpg
, struct tcm_loop_tpg
, tl_se_tpg
);
982 tl_hba
= tl_tpg
->tl_hba
;
984 sd
= scsi_device_lookup(tl_hba
->sh
, 0, tl_tpg
->tl_tpgt
,
985 se_lun
->unpacked_lun
);
987 pr_err("Unable to locate struct scsi_device for %d:%d:"
988 "%d\n", 0, tl_tpg
->tl_tpgt
, se_lun
->unpacked_lun
);
992 * Remove Linux/SCSI struct scsi_device by HCTL
994 scsi_remove_device(sd
);
997 atomic_dec_mb(&tl_tpg
->tl_tpg_port_count
);
999 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
1002 /* End items for tcm_loop_port_cit */
1004 /* Start items for tcm_loop_nexus_cit */
1006 static int tcm_loop_make_nexus(
1007 struct tcm_loop_tpg
*tl_tpg
,
1010 struct se_portal_group
*se_tpg
;
1011 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
1012 struct tcm_loop_nexus
*tl_nexus
;
1015 if (tl_tpg
->tl_hba
->tl_nexus
) {
1016 pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n");
1019 se_tpg
= &tl_tpg
->tl_se_tpg
;
1021 tl_nexus
= kzalloc(sizeof(struct tcm_loop_nexus
), GFP_KERNEL
);
1023 pr_err("Unable to allocate struct tcm_loop_nexus\n");
1027 * Initialize the struct se_session pointer
1029 tl_nexus
->se_sess
= transport_init_session(TARGET_PROT_ALL
);
1030 if (IS_ERR(tl_nexus
->se_sess
)) {
1031 ret
= PTR_ERR(tl_nexus
->se_sess
);
1035 * Since we are running in 'demo mode' this call with generate a
1036 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
1037 * Initiator port name of the passed configfs group 'name'.
1039 tl_nexus
->se_sess
->se_node_acl
= core_tpg_check_initiator_node_acl(
1040 se_tpg
, (unsigned char *)name
);
1041 if (!tl_nexus
->se_sess
->se_node_acl
) {
1042 transport_free_session(tl_nexus
->se_sess
);
1046 * Now, register the SAS I_T Nexus as active with the call to
1047 * transport_register_session()
1049 __transport_register_session(se_tpg
, tl_nexus
->se_sess
->se_node_acl
,
1050 tl_nexus
->se_sess
, tl_nexus
);
1051 tl_tpg
->tl_hba
->tl_nexus
= tl_nexus
;
1052 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
1053 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba
),
1062 static int tcm_loop_drop_nexus(
1063 struct tcm_loop_tpg
*tpg
)
1065 struct se_session
*se_sess
;
1066 struct tcm_loop_nexus
*tl_nexus
;
1067 struct tcm_loop_hba
*tl_hba
= tpg
->tl_hba
;
1072 tl_nexus
= tl_hba
->tl_nexus
;
1076 se_sess
= tl_nexus
->se_sess
;
1080 if (atomic_read(&tpg
->tl_tpg_port_count
)) {
1081 pr_err("Unable to remove TCM_Loop I_T Nexus with"
1082 " active TPG port count: %d\n",
1083 atomic_read(&tpg
->tl_tpg_port_count
));
1087 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
1088 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba
),
1089 tl_nexus
->se_sess
->se_node_acl
->initiatorname
);
1091 * Release the SCSI I_T Nexus to the emulated SAS Target Port
1093 transport_deregister_session(tl_nexus
->se_sess
);
1094 tpg
->tl_hba
->tl_nexus
= NULL
;
1099 /* End items for tcm_loop_nexus_cit */
1101 static ssize_t
tcm_loop_tpg_show_nexus(
1102 struct se_portal_group
*se_tpg
,
1105 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1106 struct tcm_loop_tpg
, tl_se_tpg
);
1107 struct tcm_loop_nexus
*tl_nexus
;
1110 tl_nexus
= tl_tpg
->tl_hba
->tl_nexus
;
1114 ret
= snprintf(page
, PAGE_SIZE
, "%s\n",
1115 tl_nexus
->se_sess
->se_node_acl
->initiatorname
);
1120 static ssize_t
tcm_loop_tpg_store_nexus(
1121 struct se_portal_group
*se_tpg
,
1125 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1126 struct tcm_loop_tpg
, tl_se_tpg
);
1127 struct tcm_loop_hba
*tl_hba
= tl_tpg
->tl_hba
;
1128 unsigned char i_port
[TL_WWN_ADDR_LEN
], *ptr
, *port_ptr
;
1131 * Shutdown the active I_T nexus if 'NULL' is passed..
1133 if (!strncmp(page
, "NULL", 4)) {
1134 ret
= tcm_loop_drop_nexus(tl_tpg
);
1135 return (!ret
) ? count
: ret
;
1138 * Otherwise make sure the passed virtual Initiator port WWN matches
1139 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
1140 * tcm_loop_make_nexus()
1142 if (strlen(page
) >= TL_WWN_ADDR_LEN
) {
1143 pr_err("Emulated NAA Sas Address: %s, exceeds"
1144 " max: %d\n", page
, TL_WWN_ADDR_LEN
);
1147 snprintf(&i_port
[0], TL_WWN_ADDR_LEN
, "%s", page
);
1149 ptr
= strstr(i_port
, "naa.");
1151 if (tl_hba
->tl_proto_id
!= SCSI_PROTOCOL_SAS
) {
1152 pr_err("Passed SAS Initiator Port %s does not"
1153 " match target port protoid: %s\n", i_port
,
1154 tcm_loop_dump_proto_id(tl_hba
));
1157 port_ptr
= &i_port
[0];
1160 ptr
= strstr(i_port
, "fc.");
1162 if (tl_hba
->tl_proto_id
!= SCSI_PROTOCOL_FCP
) {
1163 pr_err("Passed FCP Initiator Port %s does not"
1164 " match target port protoid: %s\n", i_port
,
1165 tcm_loop_dump_proto_id(tl_hba
));
1168 port_ptr
= &i_port
[3]; /* Skip over "fc." */
1171 ptr
= strstr(i_port
, "iqn.");
1173 if (tl_hba
->tl_proto_id
!= SCSI_PROTOCOL_ISCSI
) {
1174 pr_err("Passed iSCSI Initiator Port %s does not"
1175 " match target port protoid: %s\n", i_port
,
1176 tcm_loop_dump_proto_id(tl_hba
));
1179 port_ptr
= &i_port
[0];
1182 pr_err("Unable to locate prefix for emulated Initiator Port:"
1186 * Clear any trailing newline for the NAA WWN
1189 if (i_port
[strlen(i_port
)-1] == '\n')
1190 i_port
[strlen(i_port
)-1] = '\0';
1192 ret
= tcm_loop_make_nexus(tl_tpg
, port_ptr
);
1199 TF_TPG_BASE_ATTR(tcm_loop
, nexus
, S_IRUGO
| S_IWUSR
);
1201 static ssize_t
tcm_loop_tpg_show_transport_status(
1202 struct se_portal_group
*se_tpg
,
1205 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1206 struct tcm_loop_tpg
, tl_se_tpg
);
1207 const char *status
= NULL
;
1208 ssize_t ret
= -EINVAL
;
1210 switch (tl_tpg
->tl_transport_status
) {
1211 case TCM_TRANSPORT_ONLINE
:
1214 case TCM_TRANSPORT_OFFLINE
:
1222 ret
= snprintf(page
, PAGE_SIZE
, "%s\n", status
);
1227 static ssize_t
tcm_loop_tpg_store_transport_status(
1228 struct se_portal_group
*se_tpg
,
1232 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1233 struct tcm_loop_tpg
, tl_se_tpg
);
1235 if (!strncmp(page
, "online", 6)) {
1236 tl_tpg
->tl_transport_status
= TCM_TRANSPORT_ONLINE
;
1239 if (!strncmp(page
, "offline", 7)) {
1240 tl_tpg
->tl_transport_status
= TCM_TRANSPORT_OFFLINE
;
1246 TF_TPG_BASE_ATTR(tcm_loop
, transport_status
, S_IRUGO
| S_IWUSR
);
1248 static struct configfs_attribute
*tcm_loop_tpg_attrs
[] = {
1249 &tcm_loop_tpg_nexus
.attr
,
1250 &tcm_loop_tpg_transport_status
.attr
,
1254 /* Start items for tcm_loop_naa_cit */
1256 static struct se_portal_group
*tcm_loop_make_naa_tpg(
1258 struct config_group
*group
,
1261 struct tcm_loop_hba
*tl_hba
= container_of(wwn
,
1262 struct tcm_loop_hba
, tl_hba_wwn
);
1263 struct tcm_loop_tpg
*tl_tpg
;
1264 char *tpgt_str
, *end_ptr
;
1266 unsigned short int tpgt
;
1268 tpgt_str
= strstr(name
, "tpgt_");
1270 pr_err("Unable to locate \"tpgt_#\" directory"
1272 return ERR_PTR(-EINVAL
);
1274 tpgt_str
+= 5; /* Skip ahead of "tpgt_" */
1275 tpgt
= (unsigned short int) simple_strtoul(tpgt_str
, &end_ptr
, 0);
1277 if (tpgt
>= TL_TPGS_PER_HBA
) {
1278 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1279 " %u\n", tpgt
, TL_TPGS_PER_HBA
);
1280 return ERR_PTR(-EINVAL
);
1282 tl_tpg
= &tl_hba
->tl_hba_tpgs
[tpgt
];
1283 tl_tpg
->tl_hba
= tl_hba
;
1284 tl_tpg
->tl_tpgt
= tpgt
;
1286 * Register the tl_tpg as a emulated SAS TCM Target Endpoint
1288 ret
= core_tpg_register(&tcm_loop_fabric_configfs
->tf_ops
,
1289 wwn
, &tl_tpg
->tl_se_tpg
, tl_tpg
,
1290 TRANSPORT_TPG_TYPE_NORMAL
);
1292 return ERR_PTR(-ENOMEM
);
1294 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1295 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba
),
1296 config_item_name(&wwn
->wwn_group
.cg_item
), tpgt
);
1298 return &tl_tpg
->tl_se_tpg
;
1301 static void tcm_loop_drop_naa_tpg(
1302 struct se_portal_group
*se_tpg
)
1304 struct se_wwn
*wwn
= se_tpg
->se_tpg_wwn
;
1305 struct tcm_loop_tpg
*tl_tpg
= container_of(se_tpg
,
1306 struct tcm_loop_tpg
, tl_se_tpg
);
1307 struct tcm_loop_hba
*tl_hba
;
1308 unsigned short tpgt
;
1310 tl_hba
= tl_tpg
->tl_hba
;
1311 tpgt
= tl_tpg
->tl_tpgt
;
1313 * Release the I_T Nexus for the Virtual SAS link if present
1315 tcm_loop_drop_nexus(tl_tpg
);
1317 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1319 core_tpg_deregister(se_tpg
);
1321 tl_tpg
->tl_hba
= NULL
;
1322 tl_tpg
->tl_tpgt
= 0;
1324 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1325 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba
),
1326 config_item_name(&wwn
->wwn_group
.cg_item
), tpgt
);
1329 /* End items for tcm_loop_naa_cit */
1331 /* Start items for tcm_loop_cit */
1333 static struct se_wwn
*tcm_loop_make_scsi_hba(
1334 struct target_fabric_configfs
*tf
,
1335 struct config_group
*group
,
1338 struct tcm_loop_hba
*tl_hba
;
1339 struct Scsi_Host
*sh
;
1343 tl_hba
= kzalloc(sizeof(struct tcm_loop_hba
), GFP_KERNEL
);
1345 pr_err("Unable to allocate struct tcm_loop_hba\n");
1346 return ERR_PTR(-ENOMEM
);
1349 * Determine the emulated Protocol Identifier and Target Port Name
1350 * based on the incoming configfs directory name.
1352 ptr
= strstr(name
, "naa.");
1354 tl_hba
->tl_proto_id
= SCSI_PROTOCOL_SAS
;
1357 ptr
= strstr(name
, "fc.");
1359 tl_hba
->tl_proto_id
= SCSI_PROTOCOL_FCP
;
1360 off
= 3; /* Skip over "fc." */
1363 ptr
= strstr(name
, "iqn.");
1365 pr_err("Unable to locate prefix for emulated Target "
1366 "Port: %s\n", name
);
1370 tl_hba
->tl_proto_id
= SCSI_PROTOCOL_ISCSI
;
1373 if (strlen(name
) >= TL_WWN_ADDR_LEN
) {
1374 pr_err("Emulated NAA %s Address: %s, exceeds"
1375 " max: %d\n", name
, tcm_loop_dump_proto_id(tl_hba
),
1380 snprintf(&tl_hba
->tl_wwn_address
[0], TL_WWN_ADDR_LEN
, "%s", &name
[off
]);
1383 * Call device_register(tl_hba->dev) to register the emulated
1384 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1385 * device_register() callbacks in tcm_loop_driver_probe()
1387 ret
= tcm_loop_setup_hba_bus(tl_hba
, tcm_loop_hba_no_cnt
);
1392 tcm_loop_hba_no_cnt
++;
1393 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1394 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1395 tcm_loop_dump_proto_id(tl_hba
), name
, sh
->host_no
);
1397 return &tl_hba
->tl_hba_wwn
;
1400 return ERR_PTR(ret
);
1403 static void tcm_loop_drop_scsi_hba(
1406 struct tcm_loop_hba
*tl_hba
= container_of(wwn
,
1407 struct tcm_loop_hba
, tl_hba_wwn
);
1409 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1410 " SAS Address: %s at Linux/SCSI Host ID: %d\n",
1411 tl_hba
->tl_wwn_address
, tl_hba
->sh
->host_no
);
1413 * Call device_unregister() on the original tl_hba->dev.
1414 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1417 device_unregister(&tl_hba
->dev
);
1420 /* Start items for tcm_loop_cit */
1421 static ssize_t
tcm_loop_wwn_show_attr_version(
1422 struct target_fabric_configfs
*tf
,
1425 return sprintf(page
, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION
);
1428 TF_WWN_ATTR_RO(tcm_loop
, version
);
1430 static struct configfs_attribute
*tcm_loop_wwn_attrs
[] = {
1431 &tcm_loop_wwn_version
.attr
,
1435 /* End items for tcm_loop_cit */
1437 static int tcm_loop_register_configfs(void)
1439 struct target_fabric_configfs
*fabric
;
1442 * Set the TCM Loop HBA counter to zero
1444 tcm_loop_hba_no_cnt
= 0;
1446 * Register the top level struct config_item_type with TCM core
1448 fabric
= target_fabric_configfs_init(THIS_MODULE
, "loopback");
1449 if (IS_ERR(fabric
)) {
1450 pr_err("tcm_loop_register_configfs() failed!\n");
1451 return PTR_ERR(fabric
);
1454 * Setup the fabric API of function pointers used by target_core_mod
1456 fabric
->tf_ops
.get_fabric_name
= &tcm_loop_get_fabric_name
;
1457 fabric
->tf_ops
.get_fabric_proto_ident
= &tcm_loop_get_fabric_proto_ident
;
1458 fabric
->tf_ops
.tpg_get_wwn
= &tcm_loop_get_endpoint_wwn
;
1459 fabric
->tf_ops
.tpg_get_tag
= &tcm_loop_get_tag
;
1460 fabric
->tf_ops
.tpg_get_default_depth
= &tcm_loop_get_default_depth
;
1461 fabric
->tf_ops
.tpg_get_pr_transport_id
= &tcm_loop_get_pr_transport_id
;
1462 fabric
->tf_ops
.tpg_get_pr_transport_id_len
=
1463 &tcm_loop_get_pr_transport_id_len
;
1464 fabric
->tf_ops
.tpg_parse_pr_out_transport_id
=
1465 &tcm_loop_parse_pr_out_transport_id
;
1466 fabric
->tf_ops
.tpg_check_demo_mode
= &tcm_loop_check_demo_mode
;
1467 fabric
->tf_ops
.tpg_check_demo_mode_cache
=
1468 &tcm_loop_check_demo_mode_cache
;
1469 fabric
->tf_ops
.tpg_check_demo_mode_write_protect
=
1470 &tcm_loop_check_demo_mode_write_protect
;
1471 fabric
->tf_ops
.tpg_check_prod_mode_write_protect
=
1472 &tcm_loop_check_prod_mode_write_protect
;
1474 * The TCM loopback fabric module runs in demo-mode to a local
1475 * virtual SCSI device, so fabric dependent initator ACLs are
1478 fabric
->tf_ops
.tpg_alloc_fabric_acl
= &tcm_loop_tpg_alloc_fabric_acl
;
1479 fabric
->tf_ops
.tpg_release_fabric_acl
=
1480 &tcm_loop_tpg_release_fabric_acl
;
1481 fabric
->tf_ops
.tpg_get_inst_index
= &tcm_loop_get_inst_index
;
1483 * Used for setting up remaining TCM resources in process context
1485 fabric
->tf_ops
.check_stop_free
= &tcm_loop_check_stop_free
;
1486 fabric
->tf_ops
.release_cmd
= &tcm_loop_release_cmd
;
1487 fabric
->tf_ops
.shutdown_session
= &tcm_loop_shutdown_session
;
1488 fabric
->tf_ops
.close_session
= &tcm_loop_close_session
;
1489 fabric
->tf_ops
.sess_get_index
= &tcm_loop_sess_get_index
;
1490 fabric
->tf_ops
.sess_get_initiator_sid
= NULL
;
1491 fabric
->tf_ops
.write_pending
= &tcm_loop_write_pending
;
1492 fabric
->tf_ops
.write_pending_status
= &tcm_loop_write_pending_status
;
1494 * Not used for TCM loopback
1496 fabric
->tf_ops
.set_default_node_attributes
=
1497 &tcm_loop_set_default_node_attributes
;
1498 fabric
->tf_ops
.get_task_tag
= &tcm_loop_get_task_tag
;
1499 fabric
->tf_ops
.get_cmd_state
= &tcm_loop_get_cmd_state
;
1500 fabric
->tf_ops
.queue_data_in
= &tcm_loop_queue_data_in
;
1501 fabric
->tf_ops
.queue_status
= &tcm_loop_queue_status
;
1502 fabric
->tf_ops
.queue_tm_rsp
= &tcm_loop_queue_tm_rsp
;
1503 fabric
->tf_ops
.aborted_task
= &tcm_loop_aborted_task
;
1506 * Setup function pointers for generic logic in target_core_fabric_configfs.c
1508 fabric
->tf_ops
.fabric_make_wwn
= &tcm_loop_make_scsi_hba
;
1509 fabric
->tf_ops
.fabric_drop_wwn
= &tcm_loop_drop_scsi_hba
;
1510 fabric
->tf_ops
.fabric_make_tpg
= &tcm_loop_make_naa_tpg
;
1511 fabric
->tf_ops
.fabric_drop_tpg
= &tcm_loop_drop_naa_tpg
;
1513 * fabric_post_link() and fabric_pre_unlink() are used for
1514 * registration and release of TCM Loop Virtual SCSI LUNs.
1516 fabric
->tf_ops
.fabric_post_link
= &tcm_loop_port_link
;
1517 fabric
->tf_ops
.fabric_pre_unlink
= &tcm_loop_port_unlink
;
1518 fabric
->tf_ops
.fabric_make_np
= NULL
;
1519 fabric
->tf_ops
.fabric_drop_np
= NULL
;
1521 * Setup default attribute lists for various fabric->tf_cit_tmpl
1523 fabric
->tf_cit_tmpl
.tfc_wwn_cit
.ct_attrs
= tcm_loop_wwn_attrs
;
1524 fabric
->tf_cit_tmpl
.tfc_tpg_base_cit
.ct_attrs
= tcm_loop_tpg_attrs
;
1525 fabric
->tf_cit_tmpl
.tfc_tpg_attrib_cit
.ct_attrs
= NULL
;
1526 fabric
->tf_cit_tmpl
.tfc_tpg_param_cit
.ct_attrs
= NULL
;
1527 fabric
->tf_cit_tmpl
.tfc_tpg_np_base_cit
.ct_attrs
= NULL
;
1529 * Once fabric->tf_ops has been setup, now register the fabric for
1532 ret
= target_fabric_configfs_register(fabric
);
1534 pr_err("target_fabric_configfs_register() for"
1535 " TCM_Loop failed!\n");
1536 target_fabric_configfs_free(fabric
);
1540 * Setup our local pointer to *fabric.
1542 tcm_loop_fabric_configfs
= fabric
;
1543 pr_debug("TCM_LOOP[0] - Set fabric ->"
1544 " tcm_loop_fabric_configfs\n");
1548 static void tcm_loop_deregister_configfs(void)
1550 if (!tcm_loop_fabric_configfs
)
1553 target_fabric_configfs_deregister(tcm_loop_fabric_configfs
);
1554 tcm_loop_fabric_configfs
= NULL
;
1555 pr_debug("TCM_LOOP[0] - Cleared"
1556 " tcm_loop_fabric_configfs\n");
1559 static int __init
tcm_loop_fabric_init(void)
1563 tcm_loop_workqueue
= alloc_workqueue("tcm_loop", 0, 0);
1564 if (!tcm_loop_workqueue
)
1567 tcm_loop_cmd_cache
= kmem_cache_create("tcm_loop_cmd_cache",
1568 sizeof(struct tcm_loop_cmd
),
1569 __alignof__(struct tcm_loop_cmd
),
1571 if (!tcm_loop_cmd_cache
) {
1572 pr_debug("kmem_cache_create() for"
1573 " tcm_loop_cmd_cache failed\n");
1574 goto out_destroy_workqueue
;
1577 ret
= tcm_loop_alloc_core_bus();
1579 goto out_destroy_cache
;
1581 ret
= tcm_loop_register_configfs();
1583 goto out_release_core_bus
;
1587 out_release_core_bus
:
1588 tcm_loop_release_core_bus();
1590 kmem_cache_destroy(tcm_loop_cmd_cache
);
1591 out_destroy_workqueue
:
1592 destroy_workqueue(tcm_loop_workqueue
);
1597 static void __exit
tcm_loop_fabric_exit(void)
1599 tcm_loop_deregister_configfs();
1600 tcm_loop_release_core_bus();
1601 kmem_cache_destroy(tcm_loop_cmd_cache
);
1602 destroy_workqueue(tcm_loop_workqueue
);
1605 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1606 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1607 MODULE_LICENSE("GPL");
1608 module_init(tcm_loop_fabric_init
);
1609 module_exit(tcm_loop_fabric_exit
);