GNU Linux-libre 4.19.263-gnu1
[releases.git] / drivers / target / loopback / tcm_loop.c
1 /*******************************************************************************
2  *
3  * This file contains the Linux/SCSI LLD virtual SCSI initiator driver
4  * for emulated SAS initiator ports
5  *
6  * © Copyright 2011-2013 Datera, Inc.
7  *
8  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
9  *
10  * Author: Nicholas A. Bellinger <nab@risingtidesystems.com>
11  *
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.
16  *
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  ****************************************************************************/
22
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>
34
35 #include <target/target_core_base.h>
36 #include <target/target_core_fabric.h>
37
38 #include "tcm_loop.h"
39
40 #define to_tcm_loop_hba(hba)    container_of(hba, struct tcm_loop_hba, dev)
41
42 static struct workqueue_struct *tcm_loop_workqueue;
43 static struct kmem_cache *tcm_loop_cmd_cache;
44
45 static int tcm_loop_hba_no_cnt;
46
47 static int tcm_loop_queue_status(struct se_cmd *se_cmd);
48
49 /*
50  * Called from struct target_core_fabric_ops->check_stop_free()
51  */
52 static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
53 {
54         return transport_generic_free_cmd(se_cmd, 0);
55 }
56
57 static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
58 {
59         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
60                                 struct tcm_loop_cmd, tl_se_cmd);
61
62         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
63 }
64
65 static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
66 {
67         seq_puts(m, "tcm_loop_proc_info()\n");
68         return 0;
69 }
70
71 static int tcm_loop_driver_probe(struct device *);
72 static int tcm_loop_driver_remove(struct device *);
73
74 static int pseudo_lld_bus_match(struct device *dev,
75                                 struct device_driver *dev_driver)
76 {
77         return 1;
78 }
79
80 static struct bus_type tcm_loop_lld_bus = {
81         .name                   = "tcm_loop_bus",
82         .match                  = pseudo_lld_bus_match,
83         .probe                  = tcm_loop_driver_probe,
84         .remove                 = tcm_loop_driver_remove,
85 };
86
87 static struct device_driver tcm_loop_driverfs = {
88         .name                   = "tcm_loop",
89         .bus                    = &tcm_loop_lld_bus,
90 };
91 /*
92  * Used with root_device_register() in tcm_loop_alloc_core_bus() below
93  */
94 static struct device *tcm_loop_primary;
95
96 static void tcm_loop_submission_work(struct work_struct *work)
97 {
98         struct tcm_loop_cmd *tl_cmd =
99                 container_of(work, struct tcm_loop_cmd, work);
100         struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
101         struct scsi_cmnd *sc = tl_cmd->sc;
102         struct tcm_loop_nexus *tl_nexus;
103         struct tcm_loop_hba *tl_hba;
104         struct tcm_loop_tpg *tl_tpg;
105         struct scatterlist *sgl_bidi = NULL;
106         u32 sgl_bidi_count = 0, transfer_length;
107         int rc;
108
109         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
110         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
111
112         /*
113          * Ensure that this tl_tpg reference from the incoming sc->device->id
114          * has already been configured via tcm_loop_make_naa_tpg().
115          */
116         if (!tl_tpg->tl_hba) {
117                 set_host_byte(sc, DID_NO_CONNECT);
118                 goto out_done;
119         }
120         if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
121                 set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
122                 goto out_done;
123         }
124         tl_nexus = tl_tpg->tl_nexus;
125         if (!tl_nexus) {
126                 scmd_printk(KERN_ERR, sc,
127                             "TCM_Loop I_T Nexus does not exist\n");
128                 set_host_byte(sc, DID_ERROR);
129                 goto out_done;
130         }
131         if (scsi_bidi_cmnd(sc)) {
132                 struct scsi_data_buffer *sdb = scsi_in(sc);
133
134                 sgl_bidi = sdb->table.sgl;
135                 sgl_bidi_count = sdb->table.nents;
136                 se_cmd->se_cmd_flags |= SCF_BIDI;
137
138         }
139
140         transfer_length = scsi_transfer_length(sc);
141         if (!scsi_prot_sg_count(sc) &&
142             scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
143                 se_cmd->prot_pto = true;
144                 /*
145                  * loopback transport doesn't support
146                  * WRITE_GENERATE, READ_STRIP protection
147                  * information operations, go ahead unprotected.
148                  */
149                 transfer_length = scsi_bufflen(sc);
150         }
151
152         se_cmd->tag = tl_cmd->sc_cmd_tag;
153         rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
154                         &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
155                         transfer_length, TCM_SIMPLE_TAG,
156                         sc->sc_data_direction, 0,
157                         scsi_sglist(sc), scsi_sg_count(sc),
158                         sgl_bidi, sgl_bidi_count,
159                         scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
160         if (rc < 0) {
161                 set_host_byte(sc, DID_NO_CONNECT);
162                 goto out_done;
163         }
164         return;
165
166 out_done:
167         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
168         sc->scsi_done(sc);
169 }
170
171 /*
172  * ->queuecommand can be and usually is called from interrupt context, so
173  * defer the actual submission to a workqueue.
174  */
175 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
176 {
177         struct tcm_loop_cmd *tl_cmd;
178
179         pr_debug("%s() %d:%d:%d:%llu got CDB: 0x%02x scsi_buf_len: %u\n",
180                  __func__, sc->device->host->host_no, sc->device->id,
181                  sc->device->channel, sc->device->lun, sc->cmnd[0],
182                  scsi_bufflen(sc));
183
184         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
185         if (!tl_cmd) {
186                 set_host_byte(sc, DID_ERROR);
187                 sc->scsi_done(sc);
188                 return 0;
189         }
190
191         tl_cmd->sc = sc;
192         tl_cmd->sc_cmd_tag = sc->request->tag;
193         INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
194         queue_work(tcm_loop_workqueue, &tl_cmd->work);
195         return 0;
196 }
197
198 /*
199  * Called from SCSI EH process context to issue a LUN_RESET TMR
200  * to struct scsi_device
201  */
202 static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
203                               u64 lun, int task, enum tcm_tmreq_table tmr)
204 {
205         struct se_cmd *se_cmd;
206         struct se_session *se_sess;
207         struct tcm_loop_nexus *tl_nexus;
208         struct tcm_loop_cmd *tl_cmd;
209         int ret = TMR_FUNCTION_FAILED, rc;
210
211         /*
212          * Locate the tl_nexus and se_sess pointers
213          */
214         tl_nexus = tl_tpg->tl_nexus;
215         if (!tl_nexus) {
216                 pr_err("Unable to perform device reset without active I_T Nexus\n");
217                 return ret;
218         }
219
220         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
221         if (!tl_cmd)
222                 return ret;
223
224         init_completion(&tl_cmd->tmr_done);
225
226         se_cmd = &tl_cmd->tl_se_cmd;
227         se_sess = tl_tpg->tl_nexus->se_sess;
228
229         rc = target_submit_tmr(se_cmd, se_sess, tl_cmd->tl_sense_buf, lun,
230                                NULL, tmr, GFP_KERNEL, task,
231                                TARGET_SCF_ACK_KREF);
232         if (rc < 0)
233                 goto release;
234         wait_for_completion(&tl_cmd->tmr_done);
235         ret = se_cmd->se_tmr_req->response;
236         target_put_sess_cmd(se_cmd);
237
238 out:
239         return ret;
240
241 release:
242         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
243         goto out;
244 }
245
246 static int tcm_loop_abort_task(struct scsi_cmnd *sc)
247 {
248         struct tcm_loop_hba *tl_hba;
249         struct tcm_loop_tpg *tl_tpg;
250         int ret = FAILED;
251
252         /*
253          * Locate the tcm_loop_hba_t pointer
254          */
255         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
256         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
257         ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
258                                  sc->request->tag, TMR_ABORT_TASK);
259         return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
260 }
261
262 /*
263  * Called from SCSI EH process context to issue a LUN_RESET TMR
264  * to struct scsi_device
265  */
266 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
267 {
268         struct tcm_loop_hba *tl_hba;
269         struct tcm_loop_tpg *tl_tpg;
270         int ret = FAILED;
271
272         /*
273          * Locate the tcm_loop_hba_t pointer
274          */
275         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
276         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
277
278         ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
279                                  0, TMR_LUN_RESET);
280         return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
281 }
282
283 static int tcm_loop_target_reset(struct scsi_cmnd *sc)
284 {
285         struct tcm_loop_hba *tl_hba;
286         struct tcm_loop_tpg *tl_tpg;
287
288         /*
289          * Locate the tcm_loop_hba_t pointer
290          */
291         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
292         if (!tl_hba) {
293                 pr_err("Unable to perform device reset without active I_T Nexus\n");
294                 return FAILED;
295         }
296         /*
297          * Locate the tl_tpg pointer from TargetID in sc->device->id
298          */
299         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
300         if (tl_tpg) {
301                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
302                 return SUCCESS;
303         }
304         return FAILED;
305 }
306
307 static int tcm_loop_slave_alloc(struct scsi_device *sd)
308 {
309         blk_queue_flag_set(QUEUE_FLAG_BIDI, sd->request_queue);
310         return 0;
311 }
312
313 static struct scsi_host_template tcm_loop_driver_template = {
314         .show_info              = tcm_loop_show_info,
315         .proc_name              = "tcm_loopback",
316         .name                   = "TCM_Loopback",
317         .queuecommand           = tcm_loop_queuecommand,
318         .change_queue_depth     = scsi_change_queue_depth,
319         .eh_abort_handler = tcm_loop_abort_task,
320         .eh_device_reset_handler = tcm_loop_device_reset,
321         .eh_target_reset_handler = tcm_loop_target_reset,
322         .can_queue              = 1024,
323         .this_id                = -1,
324         .sg_tablesize           = 256,
325         .cmd_per_lun            = 1024,
326         .max_sectors            = 0xFFFF,
327         .use_clustering         = DISABLE_CLUSTERING,
328         .slave_alloc            = tcm_loop_slave_alloc,
329         .module                 = THIS_MODULE,
330         .track_queue_depth      = 1,
331 };
332
333 static int tcm_loop_driver_probe(struct device *dev)
334 {
335         struct tcm_loop_hba *tl_hba;
336         struct Scsi_Host *sh;
337         int error, host_prot;
338
339         tl_hba = to_tcm_loop_hba(dev);
340
341         sh = scsi_host_alloc(&tcm_loop_driver_template,
342                         sizeof(struct tcm_loop_hba));
343         if (!sh) {
344                 pr_err("Unable to allocate struct scsi_host\n");
345                 return -ENODEV;
346         }
347         tl_hba->sh = sh;
348
349         /*
350          * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
351          */
352         *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
353         /*
354          * Setup single ID, Channel and LUN for now..
355          */
356         sh->max_id = 2;
357         sh->max_lun = 0;
358         sh->max_channel = 0;
359         sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
360
361         host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
362                     SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
363                     SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
364
365         scsi_host_set_prot(sh, host_prot);
366         scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
367
368         error = scsi_add_host(sh, &tl_hba->dev);
369         if (error) {
370                 pr_err("%s: scsi_add_host failed\n", __func__);
371                 scsi_host_put(sh);
372                 return -ENODEV;
373         }
374         return 0;
375 }
376
377 static int tcm_loop_driver_remove(struct device *dev)
378 {
379         struct tcm_loop_hba *tl_hba;
380         struct Scsi_Host *sh;
381
382         tl_hba = to_tcm_loop_hba(dev);
383         sh = tl_hba->sh;
384
385         scsi_remove_host(sh);
386         scsi_host_put(sh);
387         return 0;
388 }
389
390 static void tcm_loop_release_adapter(struct device *dev)
391 {
392         struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
393
394         kfree(tl_hba);
395 }
396
397 /*
398  * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
399  */
400 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
401 {
402         int ret;
403
404         tl_hba->dev.bus = &tcm_loop_lld_bus;
405         tl_hba->dev.parent = tcm_loop_primary;
406         tl_hba->dev.release = &tcm_loop_release_adapter;
407         dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
408
409         ret = device_register(&tl_hba->dev);
410         if (ret) {
411                 pr_err("device_register() failed for tl_hba->dev: %d\n", ret);
412                 return -ENODEV;
413         }
414
415         return 0;
416 }
417
418 /*
419  * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
420  * tcm_loop SCSI bus.
421  */
422 static int tcm_loop_alloc_core_bus(void)
423 {
424         int ret;
425
426         tcm_loop_primary = root_device_register("tcm_loop_0");
427         if (IS_ERR(tcm_loop_primary)) {
428                 pr_err("Unable to allocate tcm_loop_primary\n");
429                 return PTR_ERR(tcm_loop_primary);
430         }
431
432         ret = bus_register(&tcm_loop_lld_bus);
433         if (ret) {
434                 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
435                 goto dev_unreg;
436         }
437
438         ret = driver_register(&tcm_loop_driverfs);
439         if (ret) {
440                 pr_err("driver_register() failed for tcm_loop_driverfs\n");
441                 goto bus_unreg;
442         }
443
444         pr_debug("Initialized TCM Loop Core Bus\n");
445         return ret;
446
447 bus_unreg:
448         bus_unregister(&tcm_loop_lld_bus);
449 dev_unreg:
450         root_device_unregister(tcm_loop_primary);
451         return ret;
452 }
453
454 static void tcm_loop_release_core_bus(void)
455 {
456         driver_unregister(&tcm_loop_driverfs);
457         bus_unregister(&tcm_loop_lld_bus);
458         root_device_unregister(tcm_loop_primary);
459
460         pr_debug("Releasing TCM Loop Core BUS\n");
461 }
462
463 static char *tcm_loop_get_fabric_name(void)
464 {
465         return "loopback";
466 }
467
468 static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
469 {
470         return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
471 }
472
473 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
474 {
475         /*
476          * Return the passed NAA identifier for the Target Port
477          */
478         return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
479 }
480
481 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
482 {
483         /*
484          * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
485          * to represent the SCSI Target Port.
486          */
487         return tl_tpg(se_tpg)->tl_tpgt;
488 }
489
490 /*
491  * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
492  * based upon the incoming fabric dependent SCSI Initiator Port
493  */
494 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
495 {
496         return 1;
497 }
498
499 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
500 {
501         return 0;
502 }
503
504 /*
505  * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
506  * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
507  */
508 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
509 {
510         return 0;
511 }
512
513 /*
514  * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
515  * never be called for TCM_Loop by target_core_fabric_configfs.c code.
516  * It has been added here as a nop for target_fabric_tf_ops_check()
517  */
518 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
519 {
520         return 0;
521 }
522
523 static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
524 {
525         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
526                                                    tl_se_tpg);
527         return tl_tpg->tl_fabric_prot_type;
528 }
529
530 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
531 {
532         return 1;
533 }
534
535 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
536 {
537         return 1;
538 }
539
540 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
541 {
542         return;
543 }
544
545 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
546 {
547         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
548                         struct tcm_loop_cmd, tl_se_cmd);
549
550         return tl_cmd->sc_cmd_state;
551 }
552
553 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
554 {
555         /*
556          * Since Linux/SCSI has already sent down a struct scsi_cmnd
557          * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
558          * memory, and memory has already been mapped to struct se_cmd->t_mem_list
559          * format with transport_generic_map_mem_to_cmd().
560          *
561          * We now tell TCM to add this WRITE CDB directly into the TCM storage
562          * object execution queue.
563          */
564         target_execute_cmd(se_cmd);
565         return 0;
566 }
567
568 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
569 {
570         return 0;
571 }
572
573 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
574 {
575         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
576                                 struct tcm_loop_cmd, tl_se_cmd);
577         struct scsi_cmnd *sc = tl_cmd->sc;
578
579         pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
580                  __func__, sc, sc->cmnd[0]);
581
582         sc->result = SAM_STAT_GOOD;
583         set_host_byte(sc, DID_OK);
584         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
585             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
586                 scsi_set_resid(sc, se_cmd->residual_count);
587         sc->scsi_done(sc);
588         return 0;
589 }
590
591 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
592 {
593         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
594                                 struct tcm_loop_cmd, tl_se_cmd);
595         struct scsi_cmnd *sc = tl_cmd->sc;
596
597         pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
598                  __func__, sc, sc->cmnd[0]);
599
600         if (se_cmd->sense_buffer &&
601            ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
602             (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
603
604                 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
605                                 SCSI_SENSE_BUFFERSIZE);
606                 sc->result = SAM_STAT_CHECK_CONDITION;
607                 set_driver_byte(sc, DRIVER_SENSE);
608         } else
609                 sc->result = se_cmd->scsi_status;
610
611         set_host_byte(sc, DID_OK);
612         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
613             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
614                 scsi_set_resid(sc, se_cmd->residual_count);
615         sc->scsi_done(sc);
616         return 0;
617 }
618
619 static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
620 {
621         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
622                                 struct tcm_loop_cmd, tl_se_cmd);
623
624         /* Wake up tcm_loop_issue_tmr(). */
625         complete(&tl_cmd->tmr_done);
626 }
627
628 static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
629 {
630         return;
631 }
632
633 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
634 {
635         switch (tl_hba->tl_proto_id) {
636         case SCSI_PROTOCOL_SAS:
637                 return "SAS";
638         case SCSI_PROTOCOL_FCP:
639                 return "FCP";
640         case SCSI_PROTOCOL_ISCSI:
641                 return "iSCSI";
642         default:
643                 break;
644         }
645
646         return "Unknown";
647 }
648
649 /* Start items for tcm_loop_port_cit */
650
651 static int tcm_loop_port_link(
652         struct se_portal_group *se_tpg,
653         struct se_lun *lun)
654 {
655         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
656                                 struct tcm_loop_tpg, tl_se_tpg);
657         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
658
659         atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
660         /*
661          * Add Linux/SCSI struct scsi_device by HCTL
662          */
663         scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
664
665         pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
666         return 0;
667 }
668
669 static void tcm_loop_port_unlink(
670         struct se_portal_group *se_tpg,
671         struct se_lun *se_lun)
672 {
673         struct scsi_device *sd;
674         struct tcm_loop_hba *tl_hba;
675         struct tcm_loop_tpg *tl_tpg;
676
677         tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
678         tl_hba = tl_tpg->tl_hba;
679
680         sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
681                                 se_lun->unpacked_lun);
682         if (!sd) {
683                 pr_err("Unable to locate struct scsi_device for %d:%d:%llu\n",
684                        0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
685                 return;
686         }
687         /*
688          * Remove Linux/SCSI struct scsi_device by HCTL
689          */
690         scsi_remove_device(sd);
691         scsi_device_put(sd);
692
693         atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
694
695         pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
696 }
697
698 /* End items for tcm_loop_port_cit */
699
700 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
701                 struct config_item *item, char *page)
702 {
703         struct se_portal_group *se_tpg = attrib_to_tpg(item);
704         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
705                                                    tl_se_tpg);
706
707         return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
708 }
709
710 static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
711                 struct config_item *item, const char *page, size_t count)
712 {
713         struct se_portal_group *se_tpg = attrib_to_tpg(item);
714         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
715                                                    tl_se_tpg);
716         unsigned long val;
717         int ret = kstrtoul(page, 0, &val);
718
719         if (ret) {
720                 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
721                 return ret;
722         }
723         if (val != 0 && val != 1 && val != 3) {
724                 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
725                 return -EINVAL;
726         }
727         tl_tpg->tl_fabric_prot_type = val;
728
729         return count;
730 }
731
732 CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
733
734 static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
735         &tcm_loop_tpg_attrib_attr_fabric_prot_type,
736         NULL,
737 };
738
739 /* Start items for tcm_loop_nexus_cit */
740
741 static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg,
742                                   struct se_session *se_sess, void *p)
743 {
744         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
745                                         struct tcm_loop_tpg, tl_se_tpg);
746
747         tl_tpg->tl_nexus = p;
748         return 0;
749 }
750
751 static int tcm_loop_make_nexus(
752         struct tcm_loop_tpg *tl_tpg,
753         const char *name)
754 {
755         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
756         struct tcm_loop_nexus *tl_nexus;
757         int ret;
758
759         if (tl_tpg->tl_nexus) {
760                 pr_debug("tl_tpg->tl_nexus already exists\n");
761                 return -EEXIST;
762         }
763
764         tl_nexus = kzalloc(sizeof(*tl_nexus), GFP_KERNEL);
765         if (!tl_nexus)
766                 return -ENOMEM;
767
768         tl_nexus->se_sess = target_setup_session(&tl_tpg->tl_se_tpg, 0, 0,
769                                         TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
770                                         name, tl_nexus, tcm_loop_alloc_sess_cb);
771         if (IS_ERR(tl_nexus->se_sess)) {
772                 ret = PTR_ERR(tl_nexus->se_sess);
773                 kfree(tl_nexus);
774                 return ret;
775         }
776
777         pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated %s Initiator Port: %s\n",
778                  tcm_loop_dump_proto_id(tl_hba), name);
779         return 0;
780 }
781
782 static int tcm_loop_drop_nexus(
783         struct tcm_loop_tpg *tpg)
784 {
785         struct se_session *se_sess;
786         struct tcm_loop_nexus *tl_nexus;
787
788         tl_nexus = tpg->tl_nexus;
789         if (!tl_nexus)
790                 return -ENODEV;
791
792         se_sess = tl_nexus->se_sess;
793         if (!se_sess)
794                 return -ENODEV;
795
796         if (atomic_read(&tpg->tl_tpg_port_count)) {
797                 pr_err("Unable to remove TCM_Loop I_T Nexus with active TPG port count: %d\n",
798                        atomic_read(&tpg->tl_tpg_port_count));
799                 return -EPERM;
800         }
801
802         pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
803                  tcm_loop_dump_proto_id(tpg->tl_hba),
804                  tl_nexus->se_sess->se_node_acl->initiatorname);
805         /*
806          * Release the SCSI I_T Nexus to the emulated Target Port
807          */
808         target_remove_session(se_sess);
809         tpg->tl_nexus = NULL;
810         kfree(tl_nexus);
811         return 0;
812 }
813
814 /* End items for tcm_loop_nexus_cit */
815
816 static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
817 {
818         struct se_portal_group *se_tpg = to_tpg(item);
819         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
820                         struct tcm_loop_tpg, tl_se_tpg);
821         struct tcm_loop_nexus *tl_nexus;
822         ssize_t ret;
823
824         tl_nexus = tl_tpg->tl_nexus;
825         if (!tl_nexus)
826                 return -ENODEV;
827
828         ret = snprintf(page, PAGE_SIZE, "%s\n",
829                 tl_nexus->se_sess->se_node_acl->initiatorname);
830
831         return ret;
832 }
833
834 static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
835                 const char *page, size_t count)
836 {
837         struct se_portal_group *se_tpg = to_tpg(item);
838         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
839                         struct tcm_loop_tpg, tl_se_tpg);
840         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
841         unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
842         int ret;
843         /*
844          * Shutdown the active I_T nexus if 'NULL' is passed..
845          */
846         if (!strncmp(page, "NULL", 4)) {
847                 ret = tcm_loop_drop_nexus(tl_tpg);
848                 return (!ret) ? count : ret;
849         }
850         /*
851          * Otherwise make sure the passed virtual Initiator port WWN matches
852          * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
853          * tcm_loop_make_nexus()
854          */
855         if (strlen(page) >= TL_WWN_ADDR_LEN) {
856                 pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
857                        page, TL_WWN_ADDR_LEN);
858                 return -EINVAL;
859         }
860         snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
861
862         ptr = strstr(i_port, "naa.");
863         if (ptr) {
864                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
865                         pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
866                                i_port, tcm_loop_dump_proto_id(tl_hba));
867                         return -EINVAL;
868                 }
869                 port_ptr = &i_port[0];
870                 goto check_newline;
871         }
872         ptr = strstr(i_port, "fc.");
873         if (ptr) {
874                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
875                         pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
876                                i_port, tcm_loop_dump_proto_id(tl_hba));
877                         return -EINVAL;
878                 }
879                 port_ptr = &i_port[3]; /* Skip over "fc." */
880                 goto check_newline;
881         }
882         ptr = strstr(i_port, "iqn.");
883         if (ptr) {
884                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
885                         pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
886                                i_port, tcm_loop_dump_proto_id(tl_hba));
887                         return -EINVAL;
888                 }
889                 port_ptr = &i_port[0];
890                 goto check_newline;
891         }
892         pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
893                i_port);
894         return -EINVAL;
895         /*
896          * Clear any trailing newline for the NAA WWN
897          */
898 check_newline:
899         if (i_port[strlen(i_port)-1] == '\n')
900                 i_port[strlen(i_port)-1] = '\0';
901
902         ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
903         if (ret < 0)
904                 return ret;
905
906         return count;
907 }
908
909 static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
910                 char *page)
911 {
912         struct se_portal_group *se_tpg = to_tpg(item);
913         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
914                         struct tcm_loop_tpg, tl_se_tpg);
915         const char *status = NULL;
916         ssize_t ret = -EINVAL;
917
918         switch (tl_tpg->tl_transport_status) {
919         case TCM_TRANSPORT_ONLINE:
920                 status = "online";
921                 break;
922         case TCM_TRANSPORT_OFFLINE:
923                 status = "offline";
924                 break;
925         default:
926                 break;
927         }
928
929         if (status)
930                 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
931
932         return ret;
933 }
934
935 static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
936                 const char *page, size_t count)
937 {
938         struct se_portal_group *se_tpg = to_tpg(item);
939         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
940                         struct tcm_loop_tpg, tl_se_tpg);
941
942         if (!strncmp(page, "online", 6)) {
943                 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
944                 return count;
945         }
946         if (!strncmp(page, "offline", 7)) {
947                 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
948                 if (tl_tpg->tl_nexus) {
949                         struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
950
951                         core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
952                 }
953                 return count;
954         }
955         return -EINVAL;
956 }
957
958 static ssize_t tcm_loop_tpg_address_show(struct config_item *item,
959                                          char *page)
960 {
961         struct se_portal_group *se_tpg = to_tpg(item);
962         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
963                         struct tcm_loop_tpg, tl_se_tpg);
964         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
965
966         return snprintf(page, PAGE_SIZE, "%d:0:%d\n",
967                         tl_hba->sh->host_no, tl_tpg->tl_tpgt);
968 }
969
970 CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
971 CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
972 CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
973
974 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
975         &tcm_loop_tpg_attr_nexus,
976         &tcm_loop_tpg_attr_transport_status,
977         &tcm_loop_tpg_attr_address,
978         NULL,
979 };
980
981 /* Start items for tcm_loop_naa_cit */
982
983 static struct se_portal_group *tcm_loop_make_naa_tpg(struct se_wwn *wwn,
984                                                      const char *name)
985 {
986         struct tcm_loop_hba *tl_hba = container_of(wwn,
987                         struct tcm_loop_hba, tl_hba_wwn);
988         struct tcm_loop_tpg *tl_tpg;
989         int ret;
990         unsigned long tpgt;
991
992         if (strstr(name, "tpgt_") != name) {
993                 pr_err("Unable to locate \"tpgt_#\" directory group\n");
994                 return ERR_PTR(-EINVAL);
995         }
996         if (kstrtoul(name+5, 10, &tpgt))
997                 return ERR_PTR(-EINVAL);
998
999         if (tpgt >= TL_TPGS_PER_HBA) {
1000                 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA: %u\n",
1001                        tpgt, TL_TPGS_PER_HBA);
1002                 return ERR_PTR(-EINVAL);
1003         }
1004         tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1005         tl_tpg->tl_hba = tl_hba;
1006         tl_tpg->tl_tpgt = tpgt;
1007         /*
1008          * Register the tl_tpg as a emulated TCM Target Endpoint
1009          */
1010         ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
1011         if (ret < 0)
1012                 return ERR_PTR(-ENOMEM);
1013
1014         pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s Target Port %s,t,0x%04lx\n",
1015                  tcm_loop_dump_proto_id(tl_hba),
1016                  config_item_name(&wwn->wwn_group.cg_item), tpgt);
1017         return &tl_tpg->tl_se_tpg;
1018 }
1019
1020 static void tcm_loop_drop_naa_tpg(
1021         struct se_portal_group *se_tpg)
1022 {
1023         struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1024         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1025                                 struct tcm_loop_tpg, tl_se_tpg);
1026         struct tcm_loop_hba *tl_hba;
1027         unsigned short tpgt;
1028
1029         tl_hba = tl_tpg->tl_hba;
1030         tpgt = tl_tpg->tl_tpgt;
1031         /*
1032          * Release the I_T Nexus for the Virtual target link if present
1033          */
1034         tcm_loop_drop_nexus(tl_tpg);
1035         /*
1036          * Deregister the tl_tpg as a emulated TCM Target Endpoint
1037          */
1038         core_tpg_deregister(se_tpg);
1039
1040         tl_tpg->tl_hba = NULL;
1041         tl_tpg->tl_tpgt = 0;
1042
1043         pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s Target Port %s,t,0x%04x\n",
1044                  tcm_loop_dump_proto_id(tl_hba),
1045                  config_item_name(&wwn->wwn_group.cg_item), tpgt);
1046 }
1047
1048 /* End items for tcm_loop_naa_cit */
1049
1050 /* Start items for tcm_loop_cit */
1051
1052 static struct se_wwn *tcm_loop_make_scsi_hba(
1053         struct target_fabric_configfs *tf,
1054         struct config_group *group,
1055         const char *name)
1056 {
1057         struct tcm_loop_hba *tl_hba;
1058         struct Scsi_Host *sh;
1059         char *ptr;
1060         int ret, off = 0;
1061
1062         tl_hba = kzalloc(sizeof(*tl_hba), GFP_KERNEL);
1063         if (!tl_hba)
1064                 return ERR_PTR(-ENOMEM);
1065
1066         /*
1067          * Determine the emulated Protocol Identifier and Target Port Name
1068          * based on the incoming configfs directory name.
1069          */
1070         ptr = strstr(name, "naa.");
1071         if (ptr) {
1072                 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1073                 goto check_len;
1074         }
1075         ptr = strstr(name, "fc.");
1076         if (ptr) {
1077                 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1078                 off = 3; /* Skip over "fc." */
1079                 goto check_len;
1080         }
1081         ptr = strstr(name, "iqn.");
1082         if (!ptr) {
1083                 pr_err("Unable to locate prefix for emulated Target Port: %s\n",
1084                        name);
1085                 ret = -EINVAL;
1086                 goto out;
1087         }
1088         tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1089
1090 check_len:
1091         if (strlen(name) >= TL_WWN_ADDR_LEN) {
1092                 pr_err("Emulated NAA %s Address: %s, exceeds max: %d\n",
1093                        name, tcm_loop_dump_proto_id(tl_hba), TL_WWN_ADDR_LEN);
1094                 ret = -EINVAL;
1095                 goto out;
1096         }
1097         snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1098
1099         /*
1100          * Call device_register(tl_hba->dev) to register the emulated
1101          * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1102          * device_register() callbacks in tcm_loop_driver_probe()
1103          */
1104         ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1105         if (ret)
1106                 goto out;
1107
1108         sh = tl_hba->sh;
1109         tcm_loop_hba_no_cnt++;
1110         pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1111                  tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1112         return &tl_hba->tl_hba_wwn;
1113 out:
1114         kfree(tl_hba);
1115         return ERR_PTR(ret);
1116 }
1117
1118 static void tcm_loop_drop_scsi_hba(
1119         struct se_wwn *wwn)
1120 {
1121         struct tcm_loop_hba *tl_hba = container_of(wwn,
1122                                 struct tcm_loop_hba, tl_hba_wwn);
1123
1124         pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1125                  tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
1126                  tl_hba->sh->host_no);
1127         /*
1128          * Call device_unregister() on the original tl_hba->dev.
1129          * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1130          * release *tl_hba;
1131          */
1132         device_unregister(&tl_hba->dev);
1133 }
1134
1135 /* Start items for tcm_loop_cit */
1136 static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
1137 {
1138         return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1139 }
1140
1141 CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
1142
1143 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1144         &tcm_loop_wwn_attr_version,
1145         NULL,
1146 };
1147
1148 /* End items for tcm_loop_cit */
1149
1150 static const struct target_core_fabric_ops loop_ops = {
1151         .module                         = THIS_MODULE,
1152         .name                           = "loopback",
1153         .get_fabric_name                = tcm_loop_get_fabric_name,
1154         .tpg_get_wwn                    = tcm_loop_get_endpoint_wwn,
1155         .tpg_get_tag                    = tcm_loop_get_tag,
1156         .tpg_check_demo_mode            = tcm_loop_check_demo_mode,
1157         .tpg_check_demo_mode_cache      = tcm_loop_check_demo_mode_cache,
1158         .tpg_check_demo_mode_write_protect =
1159                                 tcm_loop_check_demo_mode_write_protect,
1160         .tpg_check_prod_mode_write_protect =
1161                                 tcm_loop_check_prod_mode_write_protect,
1162         .tpg_check_prot_fabric_only     = tcm_loop_check_prot_fabric_only,
1163         .tpg_get_inst_index             = tcm_loop_get_inst_index,
1164         .check_stop_free                = tcm_loop_check_stop_free,
1165         .release_cmd                    = tcm_loop_release_cmd,
1166         .sess_get_index                 = tcm_loop_sess_get_index,
1167         .write_pending                  = tcm_loop_write_pending,
1168         .write_pending_status           = tcm_loop_write_pending_status,
1169         .set_default_node_attributes    = tcm_loop_set_default_node_attributes,
1170         .get_cmd_state                  = tcm_loop_get_cmd_state,
1171         .queue_data_in                  = tcm_loop_queue_data_in,
1172         .queue_status                   = tcm_loop_queue_status,
1173         .queue_tm_rsp                   = tcm_loop_queue_tm_rsp,
1174         .aborted_task                   = tcm_loop_aborted_task,
1175         .fabric_make_wwn                = tcm_loop_make_scsi_hba,
1176         .fabric_drop_wwn                = tcm_loop_drop_scsi_hba,
1177         .fabric_make_tpg                = tcm_loop_make_naa_tpg,
1178         .fabric_drop_tpg                = tcm_loop_drop_naa_tpg,
1179         .fabric_post_link               = tcm_loop_port_link,
1180         .fabric_pre_unlink              = tcm_loop_port_unlink,
1181         .tfc_wwn_attrs                  = tcm_loop_wwn_attrs,
1182         .tfc_tpg_base_attrs             = tcm_loop_tpg_attrs,
1183         .tfc_tpg_attrib_attrs           = tcm_loop_tpg_attrib_attrs,
1184 };
1185
1186 static int __init tcm_loop_fabric_init(void)
1187 {
1188         int ret = -ENOMEM;
1189
1190         tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1191         if (!tcm_loop_workqueue)
1192                 goto out;
1193
1194         tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1195                                 sizeof(struct tcm_loop_cmd),
1196                                 __alignof__(struct tcm_loop_cmd),
1197                                 0, NULL);
1198         if (!tcm_loop_cmd_cache) {
1199                 pr_debug("kmem_cache_create() for tcm_loop_cmd_cache failed\n");
1200                 goto out_destroy_workqueue;
1201         }
1202
1203         ret = tcm_loop_alloc_core_bus();
1204         if (ret)
1205                 goto out_destroy_cache;
1206
1207         ret = target_register_template(&loop_ops);
1208         if (ret)
1209                 goto out_release_core_bus;
1210
1211         return 0;
1212
1213 out_release_core_bus:
1214         tcm_loop_release_core_bus();
1215 out_destroy_cache:
1216         kmem_cache_destroy(tcm_loop_cmd_cache);
1217 out_destroy_workqueue:
1218         destroy_workqueue(tcm_loop_workqueue);
1219 out:
1220         return ret;
1221 }
1222
1223 static void __exit tcm_loop_fabric_exit(void)
1224 {
1225         target_unregister_template(&loop_ops);
1226         tcm_loop_release_core_bus();
1227         kmem_cache_destroy(tcm_loop_cmd_cache);
1228         destroy_workqueue(tcm_loop_workqueue);
1229 }
1230
1231 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1232 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1233 MODULE_LICENSE("GPL");
1234 module_init(tcm_loop_fabric_init);
1235 module_exit(tcm_loop_fabric_exit);