target: Drop unused legacy target_core_fabric_ops API callers
[linux-2.6.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 RisingTide Systems LLC.
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 #include <target/target_core_fabric_configfs.h>
38 #include <target/target_core_configfs.h>
39
40 #include "tcm_loop.h"
41
42 #define to_tcm_loop_hba(hba)    container_of(hba, struct tcm_loop_hba, dev)
43
44 /* Local pointer to allocated TCM configfs fabric module */
45 static struct target_fabric_configfs *tcm_loop_fabric_configfs;
46
47 static struct workqueue_struct *tcm_loop_workqueue;
48 static struct kmem_cache *tcm_loop_cmd_cache;
49
50 static int tcm_loop_hba_no_cnt;
51
52 static int tcm_loop_queue_status(struct se_cmd *se_cmd);
53
54 /*
55  * Called from struct target_core_fabric_ops->check_stop_free()
56  */
57 static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
58 {
59         /*
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().
63          */
64         if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
65                 return 0;
66         /*
67          * Release the struct se_cmd, which will make a callback to release
68          * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
69          */
70         transport_generic_free_cmd(se_cmd, 0);
71         return 1;
72 }
73
74 static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
75 {
76         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
77                                 struct tcm_loop_cmd, tl_se_cmd);
78
79         kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
80 }
81
82 static int tcm_loop_proc_info(struct Scsi_Host *host, char *buffer,
83                                 char **start, off_t offset,
84                                 int length, int inout)
85 {
86         return sprintf(buffer, "tcm_loop_proc_info()\n");
87 }
88
89 static int tcm_loop_driver_probe(struct device *);
90 static int tcm_loop_driver_remove(struct device *);
91
92 static int pseudo_lld_bus_match(struct device *dev,
93                                 struct device_driver *dev_driver)
94 {
95         return 1;
96 }
97
98 static struct bus_type tcm_loop_lld_bus = {
99         .name                   = "tcm_loop_bus",
100         .match                  = pseudo_lld_bus_match,
101         .probe                  = tcm_loop_driver_probe,
102         .remove                 = tcm_loop_driver_remove,
103 };
104
105 static struct device_driver tcm_loop_driverfs = {
106         .name                   = "tcm_loop",
107         .bus                    = &tcm_loop_lld_bus,
108 };
109 /*
110  * Used with root_device_register() in tcm_loop_alloc_core_bus() below
111  */
112 struct device *tcm_loop_primary;
113
114 /*
115  * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and
116  * drivers/scsi/libiscsi.c:iscsi_change_queue_depth()
117  */
118 static int tcm_loop_change_queue_depth(
119         struct scsi_device *sdev,
120         int depth,
121         int reason)
122 {
123         switch (reason) {
124         case SCSI_QDEPTH_DEFAULT:
125                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
126                 break;
127         case SCSI_QDEPTH_QFULL:
128                 scsi_track_queue_full(sdev, depth);
129                 break;
130         case SCSI_QDEPTH_RAMP_UP:
131                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
132                 break;
133         default:
134                 return -EOPNOTSUPP;
135         }
136         return sdev->queue_depth;
137 }
138
139 /*
140  * Locate the SAM Task Attr from struct scsi_cmnd *
141  */
142 static int tcm_loop_sam_attr(struct scsi_cmnd *sc)
143 {
144         if (sc->device->tagged_supported) {
145                 switch (sc->tag) {
146                 case HEAD_OF_QUEUE_TAG:
147                         return MSG_HEAD_TAG;
148                 case ORDERED_QUEUE_TAG:
149                         return MSG_ORDERED_TAG;
150                 default:
151                         break;
152                 }
153         }
154
155         return MSG_SIMPLE_TAG;
156 }
157
158 static void tcm_loop_submission_work(struct work_struct *work)
159 {
160         struct tcm_loop_cmd *tl_cmd =
161                 container_of(work, struct tcm_loop_cmd, work);
162         struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
163         struct scsi_cmnd *sc = tl_cmd->sc;
164         struct tcm_loop_nexus *tl_nexus;
165         struct tcm_loop_hba *tl_hba;
166         struct tcm_loop_tpg *tl_tpg;
167         struct scatterlist *sgl_bidi = NULL;
168         u32 sgl_bidi_count = 0;
169         int ret;
170
171         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
172         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
173
174         /*
175          * Ensure that this tl_tpg reference from the incoming sc->device->id
176          * has already been configured via tcm_loop_make_naa_tpg().
177          */
178         if (!tl_tpg->tl_hba) {
179                 set_host_byte(sc, DID_NO_CONNECT);
180                 goto out_done;
181         }
182
183         tl_nexus = tl_hba->tl_nexus;
184         if (!tl_nexus) {
185                 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
186                                 " does not exist\n");
187                 set_host_byte(sc, DID_ERROR);
188                 goto out_done;
189         }
190
191         transport_init_se_cmd(se_cmd, tl_tpg->tl_se_tpg.se_tpg_tfo,
192                         tl_nexus->se_sess,
193                         scsi_bufflen(sc), sc->sc_data_direction,
194                         tcm_loop_sam_attr(sc), &tl_cmd->tl_sense_buf[0]);
195
196         if (scsi_bidi_cmnd(sc)) {
197                 struct scsi_data_buffer *sdb = scsi_in(sc);
198
199                 sgl_bidi = sdb->table.sgl;
200                 sgl_bidi_count = sdb->table.nents;
201                 se_cmd->se_cmd_flags |= SCF_BIDI;
202
203         }
204
205         if (transport_lookup_cmd_lun(se_cmd, tl_cmd->sc->device->lun) < 0) {
206                 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
207                 set_host_byte(sc, DID_NO_CONNECT);
208                 goto out_done;
209         }
210
211         /*
212          * Because some userspace code via scsi-generic do not memset their
213          * associated read buffers, go ahead and do that here for type
214          * SCF_SCSI_CONTROL_SG_IO_CDB.  Also note that this is currently
215          * guaranteed to be a single SGL for SCF_SCSI_CONTROL_SG_IO_CDB
216          * by target core in transport_generic_allocate_tasks() ->
217          * transport_generic_cmd_sequencer().
218          */
219         if (se_cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB &&
220             se_cmd->data_direction == DMA_FROM_DEVICE) {
221                 struct scatterlist *sg = scsi_sglist(sc);
222                 unsigned char *buf = kmap(sg_page(sg)) + sg->offset;
223
224                 if (buf != NULL) {
225                         memset(buf, 0, sg->length);
226                         kunmap(sg_page(sg));
227                 }
228         }
229
230         ret = transport_generic_allocate_tasks(se_cmd, sc->cmnd);
231         if (ret == -ENOMEM) {
232                 transport_send_check_condition_and_sense(se_cmd,
233                                 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
234                 transport_generic_free_cmd(se_cmd, 0);
235                 return;
236         }
237         if (ret == -EINVAL) {
238                 if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
239                         tcm_loop_queue_status(se_cmd);
240                 else
241                         transport_send_check_condition_and_sense(se_cmd,
242                                         se_cmd->scsi_sense_reason, 0);
243                 transport_generic_free_cmd(se_cmd, 0);
244                 return;
245         }
246
247         ret = transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc),
248                         scsi_sg_count(sc), sgl_bidi, sgl_bidi_count);
249         if (ret) {
250                 transport_send_check_condition_and_sense(se_cmd,
251                                         se_cmd->scsi_sense_reason, 0);
252                 transport_generic_free_cmd(se_cmd, 0);
253                 return;
254         }
255         transport_handle_cdb_direct(se_cmd);
256         return;
257
258 out_done:
259         sc->scsi_done(sc);
260         return;
261 }
262
263 /*
264  * ->queuecommand can be and usually is called from interrupt context, so
265  * defer the actual submission to a workqueue.
266  */
267 static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
268 {
269         struct tcm_loop_cmd *tl_cmd;
270
271         pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x"
272                 " scsi_buf_len: %u\n", sc->device->host->host_no,
273                 sc->device->id, sc->device->channel, sc->device->lun,
274                 sc->cmnd[0], scsi_bufflen(sc));
275
276         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
277         if (!tl_cmd) {
278                 pr_err("Unable to allocate struct tcm_loop_cmd\n");
279                 set_host_byte(sc, DID_ERROR);
280                 sc->scsi_done(sc);
281                 return 0;
282         }
283
284         tl_cmd->sc = sc;
285         INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
286         queue_work(tcm_loop_workqueue, &tl_cmd->work);
287         return 0;
288 }
289
290 /*
291  * Called from SCSI EH process context to issue a LUN_RESET TMR
292  * to struct scsi_device
293  */
294 static int tcm_loop_device_reset(struct scsi_cmnd *sc)
295 {
296         struct se_cmd *se_cmd = NULL;
297         struct se_portal_group *se_tpg;
298         struct se_session *se_sess;
299         struct tcm_loop_cmd *tl_cmd = NULL;
300         struct tcm_loop_hba *tl_hba;
301         struct tcm_loop_nexus *tl_nexus;
302         struct tcm_loop_tmr *tl_tmr = NULL;
303         struct tcm_loop_tpg *tl_tpg;
304         int ret = FAILED, rc;
305         /*
306          * Locate the tcm_loop_hba_t pointer
307          */
308         tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
309         /*
310          * Locate the tl_nexus and se_sess pointers
311          */
312         tl_nexus = tl_hba->tl_nexus;
313         if (!tl_nexus) {
314                 pr_err("Unable to perform device reset without"
315                                 " active I_T Nexus\n");
316                 return FAILED;
317         }
318         se_sess = tl_nexus->se_sess;
319         /*
320          * Locate the tl_tpg and se_tpg pointers from TargetID in sc->device->id
321          */
322         tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
323         se_tpg = &tl_tpg->tl_se_tpg;
324
325         tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
326         if (!tl_cmd) {
327                 pr_err("Unable to allocate memory for tl_cmd\n");
328                 return FAILED;
329         }
330
331         tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
332         if (!tl_tmr) {
333                 pr_err("Unable to allocate memory for tl_tmr\n");
334                 goto release;
335         }
336         init_waitqueue_head(&tl_tmr->tl_tmr_wait);
337
338         se_cmd = &tl_cmd->tl_se_cmd;
339         /*
340          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
341          */
342         transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
343                                 DMA_NONE, MSG_SIMPLE_TAG,
344                                 &tl_cmd->tl_sense_buf[0]);
345
346         rc = core_tmr_alloc_req(se_cmd, tl_tmr, TMR_LUN_RESET, GFP_KERNEL);
347         if (rc < 0)
348                 goto release;
349         /*
350          * Locate the underlying TCM struct se_lun from sc->device->lun
351          */
352         if (transport_lookup_tmr_lun(se_cmd, sc->device->lun) < 0)
353                 goto release;
354         /*
355          * Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp()
356          * to wake us up.
357          */
358         transport_generic_handle_tmr(se_cmd);
359         wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
360         /*
361          * The TMR LUN_RESET has completed, check the response status and
362          * then release allocations.
363          */
364         ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
365                 SUCCESS : FAILED;
366 release:
367         if (se_cmd)
368                 transport_generic_free_cmd(se_cmd, 1);
369         else
370                 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
371         kfree(tl_tmr);
372         return ret;
373 }
374
375 static int tcm_loop_slave_alloc(struct scsi_device *sd)
376 {
377         set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
378         return 0;
379 }
380
381 static int tcm_loop_slave_configure(struct scsi_device *sd)
382 {
383         return 0;
384 }
385
386 static struct scsi_host_template tcm_loop_driver_template = {
387         .proc_info              = tcm_loop_proc_info,
388         .proc_name              = "tcm_loopback",
389         .name                   = "TCM_Loopback",
390         .queuecommand           = tcm_loop_queuecommand,
391         .change_queue_depth     = tcm_loop_change_queue_depth,
392         .eh_device_reset_handler = tcm_loop_device_reset,
393         .can_queue              = 1024,
394         .this_id                = -1,
395         .sg_tablesize           = 256,
396         .cmd_per_lun            = 1024,
397         .max_sectors            = 0xFFFF,
398         .use_clustering         = DISABLE_CLUSTERING,
399         .slave_alloc            = tcm_loop_slave_alloc,
400         .slave_configure        = tcm_loop_slave_configure,
401         .module                 = THIS_MODULE,
402 };
403
404 static int tcm_loop_driver_probe(struct device *dev)
405 {
406         struct tcm_loop_hba *tl_hba;
407         struct Scsi_Host *sh;
408         int error;
409
410         tl_hba = to_tcm_loop_hba(dev);
411
412         sh = scsi_host_alloc(&tcm_loop_driver_template,
413                         sizeof(struct tcm_loop_hba));
414         if (!sh) {
415                 pr_err("Unable to allocate struct scsi_host\n");
416                 return -ENODEV;
417         }
418         tl_hba->sh = sh;
419
420         /*
421          * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
422          */
423         *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
424         /*
425          * Setup single ID, Channel and LUN for now..
426          */
427         sh->max_id = 2;
428         sh->max_lun = 0;
429         sh->max_channel = 0;
430         sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN;
431
432         error = scsi_add_host(sh, &tl_hba->dev);
433         if (error) {
434                 pr_err("%s: scsi_add_host failed\n", __func__);
435                 scsi_host_put(sh);
436                 return -ENODEV;
437         }
438         return 0;
439 }
440
441 static int tcm_loop_driver_remove(struct device *dev)
442 {
443         struct tcm_loop_hba *tl_hba;
444         struct Scsi_Host *sh;
445
446         tl_hba = to_tcm_loop_hba(dev);
447         sh = tl_hba->sh;
448
449         scsi_remove_host(sh);
450         scsi_host_put(sh);
451         return 0;
452 }
453
454 static void tcm_loop_release_adapter(struct device *dev)
455 {
456         struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
457
458         kfree(tl_hba);
459 }
460
461 /*
462  * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
463  */
464 static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
465 {
466         int ret;
467
468         tl_hba->dev.bus = &tcm_loop_lld_bus;
469         tl_hba->dev.parent = tcm_loop_primary;
470         tl_hba->dev.release = &tcm_loop_release_adapter;
471         dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
472
473         ret = device_register(&tl_hba->dev);
474         if (ret) {
475                 pr_err("device_register() failed for"
476                                 " tl_hba->dev: %d\n", ret);
477                 return -ENODEV;
478         }
479
480         return 0;
481 }
482
483 /*
484  * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
485  * tcm_loop SCSI bus.
486  */
487 static int tcm_loop_alloc_core_bus(void)
488 {
489         int ret;
490
491         tcm_loop_primary = root_device_register("tcm_loop_0");
492         if (IS_ERR(tcm_loop_primary)) {
493                 pr_err("Unable to allocate tcm_loop_primary\n");
494                 return PTR_ERR(tcm_loop_primary);
495         }
496
497         ret = bus_register(&tcm_loop_lld_bus);
498         if (ret) {
499                 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
500                 goto dev_unreg;
501         }
502
503         ret = driver_register(&tcm_loop_driverfs);
504         if (ret) {
505                 pr_err("driver_register() failed for"
506                                 "tcm_loop_driverfs\n");
507                 goto bus_unreg;
508         }
509
510         pr_debug("Initialized TCM Loop Core Bus\n");
511         return ret;
512
513 bus_unreg:
514         bus_unregister(&tcm_loop_lld_bus);
515 dev_unreg:
516         root_device_unregister(tcm_loop_primary);
517         return ret;
518 }
519
520 static void tcm_loop_release_core_bus(void)
521 {
522         driver_unregister(&tcm_loop_driverfs);
523         bus_unregister(&tcm_loop_lld_bus);
524         root_device_unregister(tcm_loop_primary);
525
526         pr_debug("Releasing TCM Loop Core BUS\n");
527 }
528
529 static char *tcm_loop_get_fabric_name(void)
530 {
531         return "loopback";
532 }
533
534 static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg)
535 {
536         struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
537         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
538         /*
539          * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
540          * time based on the protocol dependent prefix of the passed configfs group.
541          *
542          * Based upon tl_proto_id, TCM_Loop emulates the requested fabric
543          * ProtocolID using target_core_fabric_lib.c symbols.
544          */
545         switch (tl_hba->tl_proto_id) {
546         case SCSI_PROTOCOL_SAS:
547                 return sas_get_fabric_proto_ident(se_tpg);
548         case SCSI_PROTOCOL_FCP:
549                 return fc_get_fabric_proto_ident(se_tpg);
550         case SCSI_PROTOCOL_ISCSI:
551                 return iscsi_get_fabric_proto_ident(se_tpg);
552         default:
553                 pr_err("Unknown tl_proto_id: 0x%02x, using"
554                         " SAS emulation\n", tl_hba->tl_proto_id);
555                 break;
556         }
557
558         return sas_get_fabric_proto_ident(se_tpg);
559 }
560
561 static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
562 {
563         struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
564         /*
565          * Return the passed NAA identifier for the SAS Target Port
566          */
567         return &tl_tpg->tl_hba->tl_wwn_address[0];
568 }
569
570 static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
571 {
572         struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
573         /*
574          * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
575          * to represent the SCSI Target Port.
576          */
577         return tl_tpg->tl_tpgt;
578 }
579
580 static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg)
581 {
582         return 1;
583 }
584
585 static u32 tcm_loop_get_pr_transport_id(
586         struct se_portal_group *se_tpg,
587         struct se_node_acl *se_nacl,
588         struct t10_pr_registration *pr_reg,
589         int *format_code,
590         unsigned char *buf)
591 {
592         struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
593         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
594
595         switch (tl_hba->tl_proto_id) {
596         case SCSI_PROTOCOL_SAS:
597                 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
598                                         format_code, buf);
599         case SCSI_PROTOCOL_FCP:
600                 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
601                                         format_code, buf);
602         case SCSI_PROTOCOL_ISCSI:
603                 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
604                                         format_code, buf);
605         default:
606                 pr_err("Unknown tl_proto_id: 0x%02x, using"
607                         " SAS emulation\n", tl_hba->tl_proto_id);
608                 break;
609         }
610
611         return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
612                         format_code, buf);
613 }
614
615 static u32 tcm_loop_get_pr_transport_id_len(
616         struct se_portal_group *se_tpg,
617         struct se_node_acl *se_nacl,
618         struct t10_pr_registration *pr_reg,
619         int *format_code)
620 {
621         struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
622         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
623
624         switch (tl_hba->tl_proto_id) {
625         case SCSI_PROTOCOL_SAS:
626                 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
627                                         format_code);
628         case SCSI_PROTOCOL_FCP:
629                 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
630                                         format_code);
631         case SCSI_PROTOCOL_ISCSI:
632                 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
633                                         format_code);
634         default:
635                 pr_err("Unknown tl_proto_id: 0x%02x, using"
636                         " SAS emulation\n", tl_hba->tl_proto_id);
637                 break;
638         }
639
640         return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
641                         format_code);
642 }
643
644 /*
645  * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
646  * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
647  */
648 static char *tcm_loop_parse_pr_out_transport_id(
649         struct se_portal_group *se_tpg,
650         const char *buf,
651         u32 *out_tid_len,
652         char **port_nexus_ptr)
653 {
654         struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
655         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
656
657         switch (tl_hba->tl_proto_id) {
658         case SCSI_PROTOCOL_SAS:
659                 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
660                                         port_nexus_ptr);
661         case SCSI_PROTOCOL_FCP:
662                 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
663                                         port_nexus_ptr);
664         case SCSI_PROTOCOL_ISCSI:
665                 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
666                                         port_nexus_ptr);
667         default:
668                 pr_err("Unknown tl_proto_id: 0x%02x, using"
669                         " SAS emulation\n", tl_hba->tl_proto_id);
670                 break;
671         }
672
673         return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
674                         port_nexus_ptr);
675 }
676
677 /*
678  * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
679  * based upon the incoming fabric dependent SCSI Initiator Port
680  */
681 static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
682 {
683         return 1;
684 }
685
686 static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
687 {
688         return 0;
689 }
690
691 /*
692  * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
693  * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
694  */
695 static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
696 {
697         return 0;
698 }
699
700 /*
701  * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
702  * never be called for TCM_Loop by target_core_fabric_configfs.c code.
703  * It has been added here as a nop for target_fabric_tf_ops_check()
704  */
705 static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
706 {
707         return 0;
708 }
709
710 static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl(
711         struct se_portal_group *se_tpg)
712 {
713         struct tcm_loop_nacl *tl_nacl;
714
715         tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL);
716         if (!tl_nacl) {
717                 pr_err("Unable to allocate struct tcm_loop_nacl\n");
718                 return NULL;
719         }
720
721         return &tl_nacl->se_node_acl;
722 }
723
724 static void tcm_loop_tpg_release_fabric_acl(
725         struct se_portal_group *se_tpg,
726         struct se_node_acl *se_nacl)
727 {
728         struct tcm_loop_nacl *tl_nacl = container_of(se_nacl,
729                                 struct tcm_loop_nacl, se_node_acl);
730
731         kfree(tl_nacl);
732 }
733
734 static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
735 {
736         return 1;
737 }
738
739 static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
740 {
741         return 1;
742 }
743
744 static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
745 {
746         return;
747 }
748
749 static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
750 {
751         return 1;
752 }
753
754 static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
755 {
756         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
757                         struct tcm_loop_cmd, tl_se_cmd);
758
759         return tl_cmd->sc_cmd_state;
760 }
761
762 static int tcm_loop_shutdown_session(struct se_session *se_sess)
763 {
764         return 0;
765 }
766
767 static void tcm_loop_close_session(struct se_session *se_sess)
768 {
769         return;
770 };
771
772 static int tcm_loop_write_pending(struct se_cmd *se_cmd)
773 {
774         /*
775          * Since Linux/SCSI has already sent down a struct scsi_cmnd
776          * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
777          * memory, and memory has already been mapped to struct se_cmd->t_mem_list
778          * format with transport_generic_map_mem_to_cmd().
779          *
780          * We now tell TCM to add this WRITE CDB directly into the TCM storage
781          * object execution queue.
782          */
783         transport_generic_process_write(se_cmd);
784         return 0;
785 }
786
787 static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
788 {
789         return 0;
790 }
791
792 static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
793 {
794         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
795                                 struct tcm_loop_cmd, tl_se_cmd);
796         struct scsi_cmnd *sc = tl_cmd->sc;
797
798         pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
799                      " cdb: 0x%02x\n", sc, sc->cmnd[0]);
800
801         sc->result = SAM_STAT_GOOD;
802         set_host_byte(sc, DID_OK);
803         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
804             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
805                 scsi_set_resid(sc, se_cmd->residual_count);
806         sc->scsi_done(sc);
807         return 0;
808 }
809
810 static int tcm_loop_queue_status(struct se_cmd *se_cmd)
811 {
812         struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
813                                 struct tcm_loop_cmd, tl_se_cmd);
814         struct scsi_cmnd *sc = tl_cmd->sc;
815
816         pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
817                         " cdb: 0x%02x\n", sc, sc->cmnd[0]);
818
819         if (se_cmd->sense_buffer &&
820            ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
821             (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
822
823                 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
824                                 SCSI_SENSE_BUFFERSIZE);
825                 sc->result = SAM_STAT_CHECK_CONDITION;
826                 set_driver_byte(sc, DRIVER_SENSE);
827         } else
828                 sc->result = se_cmd->scsi_status;
829
830         set_host_byte(sc, DID_OK);
831         if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
832             (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
833                 scsi_set_resid(sc, se_cmd->residual_count);
834         sc->scsi_done(sc);
835         return 0;
836 }
837
838 static int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
839 {
840         struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
841         struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
842         /*
843          * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
844          * and wake up the wait_queue_head_t in tcm_loop_device_reset()
845          */
846         atomic_set(&tl_tmr->tmr_complete, 1);
847         wake_up(&tl_tmr->tl_tmr_wait);
848         return 0;
849 }
850
851 static u16 tcm_loop_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length)
852 {
853         return 0;
854 }
855
856 static u16 tcm_loop_get_fabric_sense_len(void)
857 {
858         return 0;
859 }
860
861 static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
862 {
863         switch (tl_hba->tl_proto_id) {
864         case SCSI_PROTOCOL_SAS:
865                 return "SAS";
866         case SCSI_PROTOCOL_FCP:
867                 return "FCP";
868         case SCSI_PROTOCOL_ISCSI:
869                 return "iSCSI";
870         default:
871                 break;
872         }
873
874         return "Unknown";
875 }
876
877 /* Start items for tcm_loop_port_cit */
878
879 static int tcm_loop_port_link(
880         struct se_portal_group *se_tpg,
881         struct se_lun *lun)
882 {
883         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
884                                 struct tcm_loop_tpg, tl_se_tpg);
885         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
886
887         atomic_inc(&tl_tpg->tl_tpg_port_count);
888         smp_mb__after_atomic_inc();
889         /*
890          * Add Linux/SCSI struct scsi_device by HCTL
891          */
892         scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
893
894         pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
895         return 0;
896 }
897
898 static void tcm_loop_port_unlink(
899         struct se_portal_group *se_tpg,
900         struct se_lun *se_lun)
901 {
902         struct scsi_device *sd;
903         struct tcm_loop_hba *tl_hba;
904         struct tcm_loop_tpg *tl_tpg;
905
906         tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
907         tl_hba = tl_tpg->tl_hba;
908
909         sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
910                                 se_lun->unpacked_lun);
911         if (!sd) {
912                 pr_err("Unable to locate struct scsi_device for %d:%d:"
913                         "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
914                 return;
915         }
916         /*
917          * Remove Linux/SCSI struct scsi_device by HCTL
918          */
919         scsi_remove_device(sd);
920         scsi_device_put(sd);
921
922         atomic_dec(&tl_tpg->tl_tpg_port_count);
923         smp_mb__after_atomic_dec();
924
925         pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
926 }
927
928 /* End items for tcm_loop_port_cit */
929
930 /* Start items for tcm_loop_nexus_cit */
931
932 static int tcm_loop_make_nexus(
933         struct tcm_loop_tpg *tl_tpg,
934         const char *name)
935 {
936         struct se_portal_group *se_tpg;
937         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
938         struct tcm_loop_nexus *tl_nexus;
939         int ret = -ENOMEM;
940
941         if (tl_tpg->tl_hba->tl_nexus) {
942                 pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n");
943                 return -EEXIST;
944         }
945         se_tpg = &tl_tpg->tl_se_tpg;
946
947         tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
948         if (!tl_nexus) {
949                 pr_err("Unable to allocate struct tcm_loop_nexus\n");
950                 return -ENOMEM;
951         }
952         /*
953          * Initialize the struct se_session pointer
954          */
955         tl_nexus->se_sess = transport_init_session();
956         if (IS_ERR(tl_nexus->se_sess)) {
957                 ret = PTR_ERR(tl_nexus->se_sess);
958                 goto out;
959         }
960         /*
961          * Since we are running in 'demo mode' this call with generate a
962          * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
963          * Initiator port name of the passed configfs group 'name'.
964          */
965         tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
966                                 se_tpg, (unsigned char *)name);
967         if (!tl_nexus->se_sess->se_node_acl) {
968                 transport_free_session(tl_nexus->se_sess);
969                 goto out;
970         }
971         /*
972          * Now, register the SAS I_T Nexus as active with the call to
973          * transport_register_session()
974          */
975         __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
976                         tl_nexus->se_sess, tl_nexus);
977         tl_tpg->tl_hba->tl_nexus = tl_nexus;
978         pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
979                 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
980                 name);
981         return 0;
982
983 out:
984         kfree(tl_nexus);
985         return ret;
986 }
987
988 static int tcm_loop_drop_nexus(
989         struct tcm_loop_tpg *tpg)
990 {
991         struct se_session *se_sess;
992         struct tcm_loop_nexus *tl_nexus;
993         struct tcm_loop_hba *tl_hba = tpg->tl_hba;
994
995         tl_nexus = tpg->tl_hba->tl_nexus;
996         if (!tl_nexus)
997                 return -ENODEV;
998
999         se_sess = tl_nexus->se_sess;
1000         if (!se_sess)
1001                 return -ENODEV;
1002
1003         if (atomic_read(&tpg->tl_tpg_port_count)) {
1004                 pr_err("Unable to remove TCM_Loop I_T Nexus with"
1005                         " active TPG port count: %d\n",
1006                         atomic_read(&tpg->tl_tpg_port_count));
1007                 return -EPERM;
1008         }
1009
1010         pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
1011                 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1012                 tl_nexus->se_sess->se_node_acl->initiatorname);
1013         /*
1014          * Release the SCSI I_T Nexus to the emulated SAS Target Port
1015          */
1016         transport_deregister_session(tl_nexus->se_sess);
1017         tpg->tl_hba->tl_nexus = NULL;
1018         kfree(tl_nexus);
1019         return 0;
1020 }
1021
1022 /* End items for tcm_loop_nexus_cit */
1023
1024 static ssize_t tcm_loop_tpg_show_nexus(
1025         struct se_portal_group *se_tpg,
1026         char *page)
1027 {
1028         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1029                         struct tcm_loop_tpg, tl_se_tpg);
1030         struct tcm_loop_nexus *tl_nexus;
1031         ssize_t ret;
1032
1033         tl_nexus = tl_tpg->tl_hba->tl_nexus;
1034         if (!tl_nexus)
1035                 return -ENODEV;
1036
1037         ret = snprintf(page, PAGE_SIZE, "%s\n",
1038                 tl_nexus->se_sess->se_node_acl->initiatorname);
1039
1040         return ret;
1041 }
1042
1043 static ssize_t tcm_loop_tpg_store_nexus(
1044         struct se_portal_group *se_tpg,
1045         const char *page,
1046         size_t count)
1047 {
1048         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1049                         struct tcm_loop_tpg, tl_se_tpg);
1050         struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1051         unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
1052         int ret;
1053         /*
1054          * Shutdown the active I_T nexus if 'NULL' is passed..
1055          */
1056         if (!strncmp(page, "NULL", 4)) {
1057                 ret = tcm_loop_drop_nexus(tl_tpg);
1058                 return (!ret) ? count : ret;
1059         }
1060         /*
1061          * Otherwise make sure the passed virtual Initiator port WWN matches
1062          * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
1063          * tcm_loop_make_nexus()
1064          */
1065         if (strlen(page) >= TL_WWN_ADDR_LEN) {
1066                 pr_err("Emulated NAA Sas Address: %s, exceeds"
1067                                 " max: %d\n", page, TL_WWN_ADDR_LEN);
1068                 return -EINVAL;
1069         }
1070         snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
1071
1072         ptr = strstr(i_port, "naa.");
1073         if (ptr) {
1074                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
1075                         pr_err("Passed SAS Initiator Port %s does not"
1076                                 " match target port protoid: %s\n", i_port,
1077                                 tcm_loop_dump_proto_id(tl_hba));
1078                         return -EINVAL;
1079                 }
1080                 port_ptr = &i_port[0];
1081                 goto check_newline;
1082         }
1083         ptr = strstr(i_port, "fc.");
1084         if (ptr) {
1085                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
1086                         pr_err("Passed FCP Initiator Port %s does not"
1087                                 " match target port protoid: %s\n", i_port,
1088                                 tcm_loop_dump_proto_id(tl_hba));
1089                         return -EINVAL;
1090                 }
1091                 port_ptr = &i_port[3]; /* Skip over "fc." */
1092                 goto check_newline;
1093         }
1094         ptr = strstr(i_port, "iqn.");
1095         if (ptr) {
1096                 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
1097                         pr_err("Passed iSCSI Initiator Port %s does not"
1098                                 " match target port protoid: %s\n", i_port,
1099                                 tcm_loop_dump_proto_id(tl_hba));
1100                         return -EINVAL;
1101                 }
1102                 port_ptr = &i_port[0];
1103                 goto check_newline;
1104         }
1105         pr_err("Unable to locate prefix for emulated Initiator Port:"
1106                         " %s\n", i_port);
1107         return -EINVAL;
1108         /*
1109          * Clear any trailing newline for the NAA WWN
1110          */
1111 check_newline:
1112         if (i_port[strlen(i_port)-1] == '\n')
1113                 i_port[strlen(i_port)-1] = '\0';
1114
1115         ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
1116         if (ret < 0)
1117                 return ret;
1118
1119         return count;
1120 }
1121
1122 TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR);
1123
1124 static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1125         &tcm_loop_tpg_nexus.attr,
1126         NULL,
1127 };
1128
1129 /* Start items for tcm_loop_naa_cit */
1130
1131 struct se_portal_group *tcm_loop_make_naa_tpg(
1132         struct se_wwn *wwn,
1133         struct config_group *group,
1134         const char *name)
1135 {
1136         struct tcm_loop_hba *tl_hba = container_of(wwn,
1137                         struct tcm_loop_hba, tl_hba_wwn);
1138         struct tcm_loop_tpg *tl_tpg;
1139         char *tpgt_str, *end_ptr;
1140         int ret;
1141         unsigned short int tpgt;
1142
1143         tpgt_str = strstr(name, "tpgt_");
1144         if (!tpgt_str) {
1145                 pr_err("Unable to locate \"tpgt_#\" directory"
1146                                 " group\n");
1147                 return ERR_PTR(-EINVAL);
1148         }
1149         tpgt_str += 5; /* Skip ahead of "tpgt_" */
1150         tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0);
1151
1152         if (tpgt >= TL_TPGS_PER_HBA) {
1153                 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1154                                 " %u\n", tpgt, TL_TPGS_PER_HBA);
1155                 return ERR_PTR(-EINVAL);
1156         }
1157         tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1158         tl_tpg->tl_hba = tl_hba;
1159         tl_tpg->tl_tpgt = tpgt;
1160         /*
1161          * Register the tl_tpg as a emulated SAS TCM Target Endpoint
1162          */
1163         ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops,
1164                         wwn, &tl_tpg->tl_se_tpg, tl_tpg,
1165                         TRANSPORT_TPG_TYPE_NORMAL);
1166         if (ret < 0)
1167                 return ERR_PTR(-ENOMEM);
1168
1169         pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1170                 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1171                 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1172
1173         return &tl_tpg->tl_se_tpg;
1174 }
1175
1176 void tcm_loop_drop_naa_tpg(
1177         struct se_portal_group *se_tpg)
1178 {
1179         struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1180         struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1181                                 struct tcm_loop_tpg, tl_se_tpg);
1182         struct tcm_loop_hba *tl_hba;
1183         unsigned short tpgt;
1184
1185         tl_hba = tl_tpg->tl_hba;
1186         tpgt = tl_tpg->tl_tpgt;
1187         /*
1188          * Release the I_T Nexus for the Virtual SAS link if present
1189          */
1190         tcm_loop_drop_nexus(tl_tpg);
1191         /*
1192          * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1193          */
1194         core_tpg_deregister(se_tpg);
1195
1196         tl_tpg->tl_hba = NULL;
1197         tl_tpg->tl_tpgt = 0;
1198
1199         pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1200                 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1201                 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1202 }
1203
1204 /* End items for tcm_loop_naa_cit */
1205
1206 /* Start items for tcm_loop_cit */
1207
1208 struct se_wwn *tcm_loop_make_scsi_hba(
1209         struct target_fabric_configfs *tf,
1210         struct config_group *group,
1211         const char *name)
1212 {
1213         struct tcm_loop_hba *tl_hba;
1214         struct Scsi_Host *sh;
1215         char *ptr;
1216         int ret, off = 0;
1217
1218         tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1219         if (!tl_hba) {
1220                 pr_err("Unable to allocate struct tcm_loop_hba\n");
1221                 return ERR_PTR(-ENOMEM);
1222         }
1223         /*
1224          * Determine the emulated Protocol Identifier and Target Port Name
1225          * based on the incoming configfs directory name.
1226          */
1227         ptr = strstr(name, "naa.");
1228         if (ptr) {
1229                 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1230                 goto check_len;
1231         }
1232         ptr = strstr(name, "fc.");
1233         if (ptr) {
1234                 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1235                 off = 3; /* Skip over "fc." */
1236                 goto check_len;
1237         }
1238         ptr = strstr(name, "iqn.");
1239         if (!ptr) {
1240                 pr_err("Unable to locate prefix for emulated Target "
1241                                 "Port: %s\n", name);
1242                 ret = -EINVAL;
1243                 goto out;
1244         }
1245         tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1246
1247 check_len:
1248         if (strlen(name) >= TL_WWN_ADDR_LEN) {
1249                 pr_err("Emulated NAA %s Address: %s, exceeds"
1250                         " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1251                         TL_WWN_ADDR_LEN);
1252                 ret = -EINVAL;
1253                 goto out;
1254         }
1255         snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1256
1257         /*
1258          * Call device_register(tl_hba->dev) to register the emulated
1259          * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1260          * device_register() callbacks in tcm_loop_driver_probe()
1261          */
1262         ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1263         if (ret)
1264                 goto out;
1265
1266         sh = tl_hba->sh;
1267         tcm_loop_hba_no_cnt++;
1268         pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1269                 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1270                 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1271
1272         return &tl_hba->tl_hba_wwn;
1273 out:
1274         kfree(tl_hba);
1275         return ERR_PTR(ret);
1276 }
1277
1278 void tcm_loop_drop_scsi_hba(
1279         struct se_wwn *wwn)
1280 {
1281         struct tcm_loop_hba *tl_hba = container_of(wwn,
1282                                 struct tcm_loop_hba, tl_hba_wwn);
1283
1284         pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1285                 " SAS Address: %s at Linux/SCSI Host ID: %d\n",
1286                 tl_hba->tl_wwn_address, tl_hba->sh->host_no);
1287         /*
1288          * Call device_unregister() on the original tl_hba->dev.
1289          * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1290          * release *tl_hba;
1291          */
1292         device_unregister(&tl_hba->dev);
1293 }
1294
1295 /* Start items for tcm_loop_cit */
1296 static ssize_t tcm_loop_wwn_show_attr_version(
1297         struct target_fabric_configfs *tf,
1298         char *page)
1299 {
1300         return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1301 }
1302
1303 TF_WWN_ATTR_RO(tcm_loop, version);
1304
1305 static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1306         &tcm_loop_wwn_version.attr,
1307         NULL,
1308 };
1309
1310 /* End items for tcm_loop_cit */
1311
1312 static int tcm_loop_register_configfs(void)
1313 {
1314         struct target_fabric_configfs *fabric;
1315         struct config_group *tf_cg;
1316         int ret;
1317         /*
1318          * Set the TCM Loop HBA counter to zero
1319          */
1320         tcm_loop_hba_no_cnt = 0;
1321         /*
1322          * Register the top level struct config_item_type with TCM core
1323          */
1324         fabric = target_fabric_configfs_init(THIS_MODULE, "loopback");
1325         if (IS_ERR(fabric)) {
1326                 pr_err("tcm_loop_register_configfs() failed!\n");
1327                 return PTR_ERR(fabric);
1328         }
1329         /*
1330          * Setup the fabric API of function pointers used by target_core_mod
1331          */
1332         fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name;
1333         fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident;
1334         fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn;
1335         fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag;
1336         fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth;
1337         fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id;
1338         fabric->tf_ops.tpg_get_pr_transport_id_len =
1339                                         &tcm_loop_get_pr_transport_id_len;
1340         fabric->tf_ops.tpg_parse_pr_out_transport_id =
1341                                         &tcm_loop_parse_pr_out_transport_id;
1342         fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode;
1343         fabric->tf_ops.tpg_check_demo_mode_cache =
1344                                         &tcm_loop_check_demo_mode_cache;
1345         fabric->tf_ops.tpg_check_demo_mode_write_protect =
1346                                         &tcm_loop_check_demo_mode_write_protect;
1347         fabric->tf_ops.tpg_check_prod_mode_write_protect =
1348                                         &tcm_loop_check_prod_mode_write_protect;
1349         /*
1350          * The TCM loopback fabric module runs in demo-mode to a local
1351          * virtual SCSI device, so fabric dependent initator ACLs are
1352          * not required.
1353          */
1354         fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl;
1355         fabric->tf_ops.tpg_release_fabric_acl =
1356                                         &tcm_loop_tpg_release_fabric_acl;
1357         fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index;
1358         /*
1359          * Used for setting up remaining TCM resources in process context
1360          */
1361         fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free;
1362         fabric->tf_ops.release_cmd = &tcm_loop_release_cmd;
1363         fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session;
1364         fabric->tf_ops.close_session = &tcm_loop_close_session;
1365         fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index;
1366         fabric->tf_ops.sess_get_initiator_sid = NULL;
1367         fabric->tf_ops.write_pending = &tcm_loop_write_pending;
1368         fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status;
1369         /*
1370          * Not used for TCM loopback
1371          */
1372         fabric->tf_ops.set_default_node_attributes =
1373                                         &tcm_loop_set_default_node_attributes;
1374         fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag;
1375         fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state;
1376         fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in;
1377         fabric->tf_ops.queue_status = &tcm_loop_queue_status;
1378         fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp;
1379         fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len;
1380         fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len;
1381
1382         tf_cg = &fabric->tf_group;
1383         /*
1384          * Setup function pointers for generic logic in target_core_fabric_configfs.c
1385          */
1386         fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba;
1387         fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba;
1388         fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg;
1389         fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg;
1390         /*
1391          * fabric_post_link() and fabric_pre_unlink() are used for
1392          * registration and release of TCM Loop Virtual SCSI LUNs.
1393          */
1394         fabric->tf_ops.fabric_post_link = &tcm_loop_port_link;
1395         fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink;
1396         fabric->tf_ops.fabric_make_np = NULL;
1397         fabric->tf_ops.fabric_drop_np = NULL;
1398         /*
1399          * Setup default attribute lists for various fabric->tf_cit_tmpl
1400          */
1401         TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs;
1402         TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs;
1403         TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1404         TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1405         TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1406         /*
1407          * Once fabric->tf_ops has been setup, now register the fabric for
1408          * use within TCM
1409          */
1410         ret = target_fabric_configfs_register(fabric);
1411         if (ret < 0) {
1412                 pr_err("target_fabric_configfs_register() for"
1413                                 " TCM_Loop failed!\n");
1414                 target_fabric_configfs_free(fabric);
1415                 return -1;
1416         }
1417         /*
1418          * Setup our local pointer to *fabric.
1419          */
1420         tcm_loop_fabric_configfs = fabric;
1421         pr_debug("TCM_LOOP[0] - Set fabric ->"
1422                         " tcm_loop_fabric_configfs\n");
1423         return 0;
1424 }
1425
1426 static void tcm_loop_deregister_configfs(void)
1427 {
1428         if (!tcm_loop_fabric_configfs)
1429                 return;
1430
1431         target_fabric_configfs_deregister(tcm_loop_fabric_configfs);
1432         tcm_loop_fabric_configfs = NULL;
1433         pr_debug("TCM_LOOP[0] - Cleared"
1434                                 " tcm_loop_fabric_configfs\n");
1435 }
1436
1437 static int __init tcm_loop_fabric_init(void)
1438 {
1439         int ret = -ENOMEM;
1440
1441         tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1442         if (!tcm_loop_workqueue)
1443                 goto out;
1444
1445         tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1446                                 sizeof(struct tcm_loop_cmd),
1447                                 __alignof__(struct tcm_loop_cmd),
1448                                 0, NULL);
1449         if (!tcm_loop_cmd_cache) {
1450                 pr_debug("kmem_cache_create() for"
1451                         " tcm_loop_cmd_cache failed\n");
1452                 goto out_destroy_workqueue;
1453         }
1454
1455         ret = tcm_loop_alloc_core_bus();
1456         if (ret)
1457                 goto out_destroy_cache;
1458
1459         ret = tcm_loop_register_configfs();
1460         if (ret)
1461                 goto out_release_core_bus;
1462
1463         return 0;
1464
1465 out_release_core_bus:
1466         tcm_loop_release_core_bus();
1467 out_destroy_cache:
1468         kmem_cache_destroy(tcm_loop_cmd_cache);
1469 out_destroy_workqueue:
1470         destroy_workqueue(tcm_loop_workqueue);
1471 out:
1472         return ret;
1473 }
1474
1475 static void __exit tcm_loop_fabric_exit(void)
1476 {
1477         tcm_loop_deregister_configfs();
1478         tcm_loop_release_core_bus();
1479         kmem_cache_destroy(tcm_loop_cmd_cache);
1480         destroy_workqueue(tcm_loop_workqueue);
1481 }
1482
1483 MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1484 MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1485 MODULE_LICENSE("GPL");
1486 module_init(tcm_loop_fabric_init);
1487 module_exit(tcm_loop_fabric_exit);