Loading...
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_transport.h>
37#include <target/target_core_fabric_ops.h>
38#include <target/target_core_fabric_configfs.h>
39#include <target/target_core_fabric_lib.h>
40#include <target/target_core_configfs.h>
41#include <target/target_core_device.h>
42#include <target/target_core_tpg.h>
43#include <target/target_core_tmr.h>
44
45#include "tcm_loop.h"
46
47#define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev)
48
49/* Local pointer to allocated TCM configfs fabric module */
50static struct target_fabric_configfs *tcm_loop_fabric_configfs;
51
52static struct kmem_cache *tcm_loop_cmd_cache;
53
54static int tcm_loop_hba_no_cnt;
55
56/*
57 * Allocate a tcm_loop cmd descriptor from target_core_mod code
58 *
59 * Can be called from interrupt context in tcm_loop_queuecommand() below
60 */
61static struct se_cmd *tcm_loop_allocate_core_cmd(
62 struct tcm_loop_hba *tl_hba,
63 struct se_portal_group *se_tpg,
64 struct scsi_cmnd *sc)
65{
66 struct se_cmd *se_cmd;
67 struct se_session *se_sess;
68 struct tcm_loop_nexus *tl_nexus = tl_hba->tl_nexus;
69 struct tcm_loop_cmd *tl_cmd;
70 int sam_task_attr;
71
72 if (!tl_nexus) {
73 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
74 " does not exist\n");
75 set_host_byte(sc, DID_ERROR);
76 return NULL;
77 }
78 se_sess = tl_nexus->se_sess;
79
80 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
81 if (!tl_cmd) {
82 pr_err("Unable to allocate struct tcm_loop_cmd\n");
83 set_host_byte(sc, DID_ERROR);
84 return NULL;
85 }
86 se_cmd = &tl_cmd->tl_se_cmd;
87 /*
88 * Save the pointer to struct scsi_cmnd *sc
89 */
90 tl_cmd->sc = sc;
91 /*
92 * Locate the SAM Task Attr from struct scsi_cmnd *
93 */
94 if (sc->device->tagged_supported) {
95 switch (sc->tag) {
96 case HEAD_OF_QUEUE_TAG:
97 sam_task_attr = MSG_HEAD_TAG;
98 break;
99 case ORDERED_QUEUE_TAG:
100 sam_task_attr = MSG_ORDERED_TAG;
101 break;
102 default:
103 sam_task_attr = MSG_SIMPLE_TAG;
104 break;
105 }
106 } else
107 sam_task_attr = MSG_SIMPLE_TAG;
108
109 /*
110 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
111 */
112 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
113 scsi_bufflen(sc), sc->sc_data_direction, sam_task_attr,
114 &tl_cmd->tl_sense_buf[0]);
115
116 /*
117 * Signal BIDI usage with T_TASK(cmd)->t_tasks_bidi
118 */
119 if (scsi_bidi_cmnd(sc))
120 se_cmd->t_tasks_bidi = 1;
121 /*
122 * Locate the struct se_lun pointer and attach it to struct se_cmd
123 */
124 if (transport_lookup_cmd_lun(se_cmd, tl_cmd->sc->device->lun) < 0) {
125 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
126 set_host_byte(sc, DID_NO_CONNECT);
127 return NULL;
128 }
129
130 return se_cmd;
131}
132
133/*
134 * Called by struct target_core_fabric_ops->new_cmd_map()
135 *
136 * Always called in process context. A non zero return value
137 * here will signal to handle an exception based on the return code.
138 */
139static int tcm_loop_new_cmd_map(struct se_cmd *se_cmd)
140{
141 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
142 struct tcm_loop_cmd, tl_se_cmd);
143 struct scsi_cmnd *sc = tl_cmd->sc;
144 struct scatterlist *sgl_bidi = NULL;
145 u32 sgl_bidi_count = 0;
146 int ret;
147 /*
148 * Allocate the necessary tasks to complete the received CDB+data
149 */
150 ret = transport_generic_allocate_tasks(se_cmd, sc->cmnd);
151 if (ret == -ENOMEM) {
152 /* Out of Resources */
153 return PYX_TRANSPORT_LU_COMM_FAILURE;
154 } else if (ret == -EINVAL) {
155 /*
156 * Handle case for SAM_STAT_RESERVATION_CONFLICT
157 */
158 if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
159 return PYX_TRANSPORT_RESERVATION_CONFLICT;
160 /*
161 * Otherwise, return SAM_STAT_CHECK_CONDITION and return
162 * sense data.
163 */
164 return PYX_TRANSPORT_USE_SENSE_REASON;
165 }
166
167 /*
168 * For BIDI commands, pass in the extra READ buffer
169 * to transport_generic_map_mem_to_cmd() below..
170 */
171 if (se_cmd->t_tasks_bidi) {
172 struct scsi_data_buffer *sdb = scsi_in(sc);
173
174 sgl_bidi = sdb->table.sgl;
175 sgl_bidi_count = sdb->table.nents;
176 }
177
178 /* Tell the core about our preallocated memory */
179 ret = transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc),
180 scsi_sg_count(sc), sgl_bidi, sgl_bidi_count);
181 if (ret < 0)
182 return PYX_TRANSPORT_LU_COMM_FAILURE;
183
184 return 0;
185}
186
187/*
188 * Called from struct target_core_fabric_ops->check_stop_free()
189 */
190static void tcm_loop_check_stop_free(struct se_cmd *se_cmd)
191{
192 /*
193 * Do not release struct se_cmd's containing a valid TMR
194 * pointer. These will be released directly in tcm_loop_device_reset()
195 * with transport_generic_free_cmd().
196 */
197 if (se_cmd->se_tmr_req)
198 return;
199 /*
200 * Release the struct se_cmd, which will make a callback to release
201 * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
202 */
203 transport_generic_free_cmd(se_cmd, 0, 0);
204}
205
206static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
207{
208 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
209 struct tcm_loop_cmd, tl_se_cmd);
210
211 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
212}
213
214static int tcm_loop_proc_info(struct Scsi_Host *host, char *buffer,
215 char **start, off_t offset,
216 int length, int inout)
217{
218 return sprintf(buffer, "tcm_loop_proc_info()\n");
219}
220
221static int tcm_loop_driver_probe(struct device *);
222static int tcm_loop_driver_remove(struct device *);
223
224static int pseudo_lld_bus_match(struct device *dev,
225 struct device_driver *dev_driver)
226{
227 return 1;
228}
229
230static struct bus_type tcm_loop_lld_bus = {
231 .name = "tcm_loop_bus",
232 .match = pseudo_lld_bus_match,
233 .probe = tcm_loop_driver_probe,
234 .remove = tcm_loop_driver_remove,
235};
236
237static struct device_driver tcm_loop_driverfs = {
238 .name = "tcm_loop",
239 .bus = &tcm_loop_lld_bus,
240};
241/*
242 * Used with root_device_register() in tcm_loop_alloc_core_bus() below
243 */
244struct device *tcm_loop_primary;
245
246/*
247 * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and
248 * drivers/scsi/libiscsi.c:iscsi_change_queue_depth()
249 */
250static int tcm_loop_change_queue_depth(
251 struct scsi_device *sdev,
252 int depth,
253 int reason)
254{
255 switch (reason) {
256 case SCSI_QDEPTH_DEFAULT:
257 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
258 break;
259 case SCSI_QDEPTH_QFULL:
260 scsi_track_queue_full(sdev, depth);
261 break;
262 case SCSI_QDEPTH_RAMP_UP:
263 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
264 break;
265 default:
266 return -EOPNOTSUPP;
267 }
268 return sdev->queue_depth;
269}
270
271/*
272 * Main entry point from struct scsi_host_template for incoming SCSI CDB+Data
273 * from Linux/SCSI subsystem for SCSI low level device drivers (LLDs)
274 */
275static int tcm_loop_queuecommand(
276 struct Scsi_Host *sh,
277 struct scsi_cmnd *sc)
278{
279 struct se_cmd *se_cmd;
280 struct se_portal_group *se_tpg;
281 struct tcm_loop_hba *tl_hba;
282 struct tcm_loop_tpg *tl_tpg;
283
284 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x"
285 " scsi_buf_len: %u\n", sc->device->host->host_no,
286 sc->device->id, sc->device->channel, sc->device->lun,
287 sc->cmnd[0], scsi_bufflen(sc));
288 /*
289 * Locate the tcm_loop_hba_t pointer
290 */
291 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
292 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
293 se_tpg = &tl_tpg->tl_se_tpg;
294 /*
295 * Determine the SAM Task Attribute and allocate tl_cmd and
296 * tl_cmd->tl_se_cmd from TCM infrastructure
297 */
298 se_cmd = tcm_loop_allocate_core_cmd(tl_hba, se_tpg, sc);
299 if (!se_cmd) {
300 sc->scsi_done(sc);
301 return 0;
302 }
303 /*
304 * Queue up the newly allocated to be processed in TCM thread context.
305 */
306 transport_generic_handle_cdb_map(se_cmd);
307 return 0;
308}
309
310/*
311 * Called from SCSI EH process context to issue a LUN_RESET TMR
312 * to struct scsi_device
313 */
314static int tcm_loop_device_reset(struct scsi_cmnd *sc)
315{
316 struct se_cmd *se_cmd = NULL;
317 struct se_portal_group *se_tpg;
318 struct se_session *se_sess;
319 struct tcm_loop_cmd *tl_cmd = NULL;
320 struct tcm_loop_hba *tl_hba;
321 struct tcm_loop_nexus *tl_nexus;
322 struct tcm_loop_tmr *tl_tmr = NULL;
323 struct tcm_loop_tpg *tl_tpg;
324 int ret = FAILED;
325 /*
326 * Locate the tcm_loop_hba_t pointer
327 */
328 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
329 /*
330 * Locate the tl_nexus and se_sess pointers
331 */
332 tl_nexus = tl_hba->tl_nexus;
333 if (!tl_nexus) {
334 pr_err("Unable to perform device reset without"
335 " active I_T Nexus\n");
336 return FAILED;
337 }
338 se_sess = tl_nexus->se_sess;
339 /*
340 * Locate the tl_tpg and se_tpg pointers from TargetID in sc->device->id
341 */
342 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
343 se_tpg = &tl_tpg->tl_se_tpg;
344
345 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
346 if (!tl_cmd) {
347 pr_err("Unable to allocate memory for tl_cmd\n");
348 return FAILED;
349 }
350
351 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
352 if (!tl_tmr) {
353 pr_err("Unable to allocate memory for tl_tmr\n");
354 goto release;
355 }
356 init_waitqueue_head(&tl_tmr->tl_tmr_wait);
357
358 se_cmd = &tl_cmd->tl_se_cmd;
359 /*
360 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
361 */
362 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
363 DMA_NONE, MSG_SIMPLE_TAG,
364 &tl_cmd->tl_sense_buf[0]);
365 /*
366 * Allocate the LUN_RESET TMR
367 */
368 se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd, tl_tmr,
369 TMR_LUN_RESET);
370 if (IS_ERR(se_cmd->se_tmr_req))
371 goto release;
372 /*
373 * Locate the underlying TCM struct se_lun from sc->device->lun
374 */
375 if (transport_lookup_tmr_lun(se_cmd, sc->device->lun) < 0)
376 goto release;
377 /*
378 * Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp()
379 * to wake us up.
380 */
381 transport_generic_handle_tmr(se_cmd);
382 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
383 /*
384 * The TMR LUN_RESET has completed, check the response status and
385 * then release allocations.
386 */
387 ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
388 SUCCESS : FAILED;
389release:
390 if (se_cmd)
391 transport_generic_free_cmd(se_cmd, 1, 0);
392 else
393 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
394 kfree(tl_tmr);
395 return ret;
396}
397
398static int tcm_loop_slave_alloc(struct scsi_device *sd)
399{
400 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
401 return 0;
402}
403
404static int tcm_loop_slave_configure(struct scsi_device *sd)
405{
406 return 0;
407}
408
409static struct scsi_host_template tcm_loop_driver_template = {
410 .proc_info = tcm_loop_proc_info,
411 .proc_name = "tcm_loopback",
412 .name = "TCM_Loopback",
413 .queuecommand = tcm_loop_queuecommand,
414 .change_queue_depth = tcm_loop_change_queue_depth,
415 .eh_device_reset_handler = tcm_loop_device_reset,
416 .can_queue = TL_SCSI_CAN_QUEUE,
417 .this_id = -1,
418 .sg_tablesize = TL_SCSI_SG_TABLESIZE,
419 .cmd_per_lun = TL_SCSI_CMD_PER_LUN,
420 .max_sectors = TL_SCSI_MAX_SECTORS,
421 .use_clustering = DISABLE_CLUSTERING,
422 .slave_alloc = tcm_loop_slave_alloc,
423 .slave_configure = tcm_loop_slave_configure,
424 .module = THIS_MODULE,
425};
426
427static int tcm_loop_driver_probe(struct device *dev)
428{
429 struct tcm_loop_hba *tl_hba;
430 struct Scsi_Host *sh;
431 int error;
432
433 tl_hba = to_tcm_loop_hba(dev);
434
435 sh = scsi_host_alloc(&tcm_loop_driver_template,
436 sizeof(struct tcm_loop_hba));
437 if (!sh) {
438 pr_err("Unable to allocate struct scsi_host\n");
439 return -ENODEV;
440 }
441 tl_hba->sh = sh;
442
443 /*
444 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
445 */
446 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
447 /*
448 * Setup single ID, Channel and LUN for now..
449 */
450 sh->max_id = 2;
451 sh->max_lun = 0;
452 sh->max_channel = 0;
453 sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN;
454
455 error = scsi_add_host(sh, &tl_hba->dev);
456 if (error) {
457 pr_err("%s: scsi_add_host failed\n", __func__);
458 scsi_host_put(sh);
459 return -ENODEV;
460 }
461 return 0;
462}
463
464static int tcm_loop_driver_remove(struct device *dev)
465{
466 struct tcm_loop_hba *tl_hba;
467 struct Scsi_Host *sh;
468
469 tl_hba = to_tcm_loop_hba(dev);
470 sh = tl_hba->sh;
471
472 scsi_remove_host(sh);
473 scsi_host_put(sh);
474 return 0;
475}
476
477static void tcm_loop_release_adapter(struct device *dev)
478{
479 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
480
481 kfree(tl_hba);
482}
483
484/*
485 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
486 */
487static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
488{
489 int ret;
490
491 tl_hba->dev.bus = &tcm_loop_lld_bus;
492 tl_hba->dev.parent = tcm_loop_primary;
493 tl_hba->dev.release = &tcm_loop_release_adapter;
494 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
495
496 ret = device_register(&tl_hba->dev);
497 if (ret) {
498 pr_err("device_register() failed for"
499 " tl_hba->dev: %d\n", ret);
500 return -ENODEV;
501 }
502
503 return 0;
504}
505
506/*
507 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
508 * tcm_loop SCSI bus.
509 */
510static int tcm_loop_alloc_core_bus(void)
511{
512 int ret;
513
514 tcm_loop_primary = root_device_register("tcm_loop_0");
515 if (IS_ERR(tcm_loop_primary)) {
516 pr_err("Unable to allocate tcm_loop_primary\n");
517 return PTR_ERR(tcm_loop_primary);
518 }
519
520 ret = bus_register(&tcm_loop_lld_bus);
521 if (ret) {
522 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
523 goto dev_unreg;
524 }
525
526 ret = driver_register(&tcm_loop_driverfs);
527 if (ret) {
528 pr_err("driver_register() failed for"
529 "tcm_loop_driverfs\n");
530 goto bus_unreg;
531 }
532
533 pr_debug("Initialized TCM Loop Core Bus\n");
534 return ret;
535
536bus_unreg:
537 bus_unregister(&tcm_loop_lld_bus);
538dev_unreg:
539 root_device_unregister(tcm_loop_primary);
540 return ret;
541}
542
543static void tcm_loop_release_core_bus(void)
544{
545 driver_unregister(&tcm_loop_driverfs);
546 bus_unregister(&tcm_loop_lld_bus);
547 root_device_unregister(tcm_loop_primary);
548
549 pr_debug("Releasing TCM Loop Core BUS\n");
550}
551
552static char *tcm_loop_get_fabric_name(void)
553{
554 return "loopback";
555}
556
557static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg)
558{
559 struct tcm_loop_tpg *tl_tpg =
560 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
561 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
562 /*
563 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
564 * time based on the protocol dependent prefix of the passed configfs group.
565 *
566 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric
567 * ProtocolID using target_core_fabric_lib.c symbols.
568 */
569 switch (tl_hba->tl_proto_id) {
570 case SCSI_PROTOCOL_SAS:
571 return sas_get_fabric_proto_ident(se_tpg);
572 case SCSI_PROTOCOL_FCP:
573 return fc_get_fabric_proto_ident(se_tpg);
574 case SCSI_PROTOCOL_ISCSI:
575 return iscsi_get_fabric_proto_ident(se_tpg);
576 default:
577 pr_err("Unknown tl_proto_id: 0x%02x, using"
578 " SAS emulation\n", tl_hba->tl_proto_id);
579 break;
580 }
581
582 return sas_get_fabric_proto_ident(se_tpg);
583}
584
585static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
586{
587 struct tcm_loop_tpg *tl_tpg =
588 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
589 /*
590 * Return the passed NAA identifier for the SAS Target Port
591 */
592 return &tl_tpg->tl_hba->tl_wwn_address[0];
593}
594
595static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
596{
597 struct tcm_loop_tpg *tl_tpg =
598 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
599 /*
600 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
601 * to represent the SCSI Target Port.
602 */
603 return tl_tpg->tl_tpgt;
604}
605
606static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg)
607{
608 return 1;
609}
610
611static u32 tcm_loop_get_pr_transport_id(
612 struct se_portal_group *se_tpg,
613 struct se_node_acl *se_nacl,
614 struct t10_pr_registration *pr_reg,
615 int *format_code,
616 unsigned char *buf)
617{
618 struct tcm_loop_tpg *tl_tpg =
619 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
620 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
621
622 switch (tl_hba->tl_proto_id) {
623 case SCSI_PROTOCOL_SAS:
624 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
625 format_code, buf);
626 case SCSI_PROTOCOL_FCP:
627 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
628 format_code, buf);
629 case SCSI_PROTOCOL_ISCSI:
630 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
631 format_code, buf);
632 default:
633 pr_err("Unknown tl_proto_id: 0x%02x, using"
634 " SAS emulation\n", tl_hba->tl_proto_id);
635 break;
636 }
637
638 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
639 format_code, buf);
640}
641
642static u32 tcm_loop_get_pr_transport_id_len(
643 struct se_portal_group *se_tpg,
644 struct se_node_acl *se_nacl,
645 struct t10_pr_registration *pr_reg,
646 int *format_code)
647{
648 struct tcm_loop_tpg *tl_tpg =
649 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
650 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
651
652 switch (tl_hba->tl_proto_id) {
653 case SCSI_PROTOCOL_SAS:
654 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
655 format_code);
656 case SCSI_PROTOCOL_FCP:
657 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
658 format_code);
659 case SCSI_PROTOCOL_ISCSI:
660 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
661 format_code);
662 default:
663 pr_err("Unknown tl_proto_id: 0x%02x, using"
664 " SAS emulation\n", tl_hba->tl_proto_id);
665 break;
666 }
667
668 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
669 format_code);
670}
671
672/*
673 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
674 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
675 */
676static char *tcm_loop_parse_pr_out_transport_id(
677 struct se_portal_group *se_tpg,
678 const char *buf,
679 u32 *out_tid_len,
680 char **port_nexus_ptr)
681{
682 struct tcm_loop_tpg *tl_tpg =
683 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
684 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
685
686 switch (tl_hba->tl_proto_id) {
687 case SCSI_PROTOCOL_SAS:
688 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
689 port_nexus_ptr);
690 case SCSI_PROTOCOL_FCP:
691 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
692 port_nexus_ptr);
693 case SCSI_PROTOCOL_ISCSI:
694 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
695 port_nexus_ptr);
696 default:
697 pr_err("Unknown tl_proto_id: 0x%02x, using"
698 " SAS emulation\n", tl_hba->tl_proto_id);
699 break;
700 }
701
702 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
703 port_nexus_ptr);
704}
705
706/*
707 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
708 * based upon the incoming fabric dependent SCSI Initiator Port
709 */
710static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
711{
712 return 1;
713}
714
715static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
716{
717 return 0;
718}
719
720/*
721 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
722 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
723 */
724static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
725{
726 return 0;
727}
728
729/*
730 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
731 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
732 * It has been added here as a nop for target_fabric_tf_ops_check()
733 */
734static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
735{
736 return 0;
737}
738
739static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl(
740 struct se_portal_group *se_tpg)
741{
742 struct tcm_loop_nacl *tl_nacl;
743
744 tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL);
745 if (!tl_nacl) {
746 pr_err("Unable to allocate struct tcm_loop_nacl\n");
747 return NULL;
748 }
749
750 return &tl_nacl->se_node_acl;
751}
752
753static void tcm_loop_tpg_release_fabric_acl(
754 struct se_portal_group *se_tpg,
755 struct se_node_acl *se_nacl)
756{
757 struct tcm_loop_nacl *tl_nacl = container_of(se_nacl,
758 struct tcm_loop_nacl, se_node_acl);
759
760 kfree(tl_nacl);
761}
762
763static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
764{
765 return 1;
766}
767
768static int tcm_loop_is_state_remove(struct se_cmd *se_cmd)
769{
770 /*
771 * Assume struct scsi_cmnd is not in remove state..
772 */
773 return 0;
774}
775
776static int tcm_loop_sess_logged_in(struct se_session *se_sess)
777{
778 /*
779 * Assume that TL Nexus is always active
780 */
781 return 1;
782}
783
784static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
785{
786 return 1;
787}
788
789static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
790{
791 return;
792}
793
794static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
795{
796 return 1;
797}
798
799static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
800{
801 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
802 struct tcm_loop_cmd, tl_se_cmd);
803
804 return tl_cmd->sc_cmd_state;
805}
806
807static int tcm_loop_shutdown_session(struct se_session *se_sess)
808{
809 return 0;
810}
811
812static void tcm_loop_close_session(struct se_session *se_sess)
813{
814 return;
815};
816
817static void tcm_loop_stop_session(
818 struct se_session *se_sess,
819 int sess_sleep,
820 int conn_sleep)
821{
822 return;
823}
824
825static void tcm_loop_fall_back_to_erl0(struct se_session *se_sess)
826{
827 return;
828}
829
830static int tcm_loop_write_pending(struct se_cmd *se_cmd)
831{
832 /*
833 * Since Linux/SCSI has already sent down a struct scsi_cmnd
834 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
835 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
836 * format with transport_generic_map_mem_to_cmd().
837 *
838 * We now tell TCM to add this WRITE CDB directly into the TCM storage
839 * object execution queue.
840 */
841 transport_generic_process_write(se_cmd);
842 return 0;
843}
844
845static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
846{
847 return 0;
848}
849
850static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
851{
852 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
853 struct tcm_loop_cmd, tl_se_cmd);
854 struct scsi_cmnd *sc = tl_cmd->sc;
855
856 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
857 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
858
859 sc->result = SAM_STAT_GOOD;
860 set_host_byte(sc, DID_OK);
861 sc->scsi_done(sc);
862 return 0;
863}
864
865static int tcm_loop_queue_status(struct se_cmd *se_cmd)
866{
867 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
868 struct tcm_loop_cmd, tl_se_cmd);
869 struct scsi_cmnd *sc = tl_cmd->sc;
870
871 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
872 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
873
874 if (se_cmd->sense_buffer &&
875 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
876 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
877
878 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
879 SCSI_SENSE_BUFFERSIZE);
880 sc->result = SAM_STAT_CHECK_CONDITION;
881 set_driver_byte(sc, DRIVER_SENSE);
882 } else
883 sc->result = se_cmd->scsi_status;
884
885 set_host_byte(sc, DID_OK);
886 sc->scsi_done(sc);
887 return 0;
888}
889
890static int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
891{
892 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
893 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
894 /*
895 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
896 * and wake up the wait_queue_head_t in tcm_loop_device_reset()
897 */
898 atomic_set(&tl_tmr->tmr_complete, 1);
899 wake_up(&tl_tmr->tl_tmr_wait);
900 return 0;
901}
902
903static u16 tcm_loop_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length)
904{
905 return 0;
906}
907
908static u16 tcm_loop_get_fabric_sense_len(void)
909{
910 return 0;
911}
912
913static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
914{
915 switch (tl_hba->tl_proto_id) {
916 case SCSI_PROTOCOL_SAS:
917 return "SAS";
918 case SCSI_PROTOCOL_FCP:
919 return "FCP";
920 case SCSI_PROTOCOL_ISCSI:
921 return "iSCSI";
922 default:
923 break;
924 }
925
926 return "Unknown";
927}
928
929/* Start items for tcm_loop_port_cit */
930
931static int tcm_loop_port_link(
932 struct se_portal_group *se_tpg,
933 struct se_lun *lun)
934{
935 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
936 struct tcm_loop_tpg, tl_se_tpg);
937 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
938
939 atomic_inc(&tl_tpg->tl_tpg_port_count);
940 smp_mb__after_atomic_inc();
941 /*
942 * Add Linux/SCSI struct scsi_device by HCTL
943 */
944 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
945
946 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
947 return 0;
948}
949
950static void tcm_loop_port_unlink(
951 struct se_portal_group *se_tpg,
952 struct se_lun *se_lun)
953{
954 struct scsi_device *sd;
955 struct tcm_loop_hba *tl_hba;
956 struct tcm_loop_tpg *tl_tpg;
957
958 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
959 tl_hba = tl_tpg->tl_hba;
960
961 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
962 se_lun->unpacked_lun);
963 if (!sd) {
964 pr_err("Unable to locate struct scsi_device for %d:%d:"
965 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
966 return;
967 }
968 /*
969 * Remove Linux/SCSI struct scsi_device by HCTL
970 */
971 scsi_remove_device(sd);
972 scsi_device_put(sd);
973
974 atomic_dec(&tl_tpg->tl_tpg_port_count);
975 smp_mb__after_atomic_dec();
976
977 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
978}
979
980/* End items for tcm_loop_port_cit */
981
982/* Start items for tcm_loop_nexus_cit */
983
984static int tcm_loop_make_nexus(
985 struct tcm_loop_tpg *tl_tpg,
986 const char *name)
987{
988 struct se_portal_group *se_tpg;
989 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
990 struct tcm_loop_nexus *tl_nexus;
991 int ret = -ENOMEM;
992
993 if (tl_tpg->tl_hba->tl_nexus) {
994 pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n");
995 return -EEXIST;
996 }
997 se_tpg = &tl_tpg->tl_se_tpg;
998
999 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
1000 if (!tl_nexus) {
1001 pr_err("Unable to allocate struct tcm_loop_nexus\n");
1002 return -ENOMEM;
1003 }
1004 /*
1005 * Initialize the struct se_session pointer
1006 */
1007 tl_nexus->se_sess = transport_init_session();
1008 if (IS_ERR(tl_nexus->se_sess)) {
1009 ret = PTR_ERR(tl_nexus->se_sess);
1010 goto out;
1011 }
1012 /*
1013 * Since we are running in 'demo mode' this call with generate a
1014 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
1015 * Initiator port name of the passed configfs group 'name'.
1016 */
1017 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1018 se_tpg, (unsigned char *)name);
1019 if (!tl_nexus->se_sess->se_node_acl) {
1020 transport_free_session(tl_nexus->se_sess);
1021 goto out;
1022 }
1023 /*
1024 * Now, register the SAS I_T Nexus as active with the call to
1025 * transport_register_session()
1026 */
1027 __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
1028 tl_nexus->se_sess, tl_nexus);
1029 tl_tpg->tl_hba->tl_nexus = tl_nexus;
1030 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
1031 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1032 name);
1033 return 0;
1034
1035out:
1036 kfree(tl_nexus);
1037 return ret;
1038}
1039
1040static int tcm_loop_drop_nexus(
1041 struct tcm_loop_tpg *tpg)
1042{
1043 struct se_session *se_sess;
1044 struct tcm_loop_nexus *tl_nexus;
1045 struct tcm_loop_hba *tl_hba = tpg->tl_hba;
1046
1047 tl_nexus = tpg->tl_hba->tl_nexus;
1048 if (!tl_nexus)
1049 return -ENODEV;
1050
1051 se_sess = tl_nexus->se_sess;
1052 if (!se_sess)
1053 return -ENODEV;
1054
1055 if (atomic_read(&tpg->tl_tpg_port_count)) {
1056 pr_err("Unable to remove TCM_Loop I_T Nexus with"
1057 " active TPG port count: %d\n",
1058 atomic_read(&tpg->tl_tpg_port_count));
1059 return -EPERM;
1060 }
1061
1062 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
1063 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1064 tl_nexus->se_sess->se_node_acl->initiatorname);
1065 /*
1066 * Release the SCSI I_T Nexus to the emulated SAS Target Port
1067 */
1068 transport_deregister_session(tl_nexus->se_sess);
1069 tpg->tl_hba->tl_nexus = NULL;
1070 kfree(tl_nexus);
1071 return 0;
1072}
1073
1074/* End items for tcm_loop_nexus_cit */
1075
1076static ssize_t tcm_loop_tpg_show_nexus(
1077 struct se_portal_group *se_tpg,
1078 char *page)
1079{
1080 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1081 struct tcm_loop_tpg, tl_se_tpg);
1082 struct tcm_loop_nexus *tl_nexus;
1083 ssize_t ret;
1084
1085 tl_nexus = tl_tpg->tl_hba->tl_nexus;
1086 if (!tl_nexus)
1087 return -ENODEV;
1088
1089 ret = snprintf(page, PAGE_SIZE, "%s\n",
1090 tl_nexus->se_sess->se_node_acl->initiatorname);
1091
1092 return ret;
1093}
1094
1095static ssize_t tcm_loop_tpg_store_nexus(
1096 struct se_portal_group *se_tpg,
1097 const char *page,
1098 size_t count)
1099{
1100 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1101 struct tcm_loop_tpg, tl_se_tpg);
1102 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1103 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
1104 int ret;
1105 /*
1106 * Shutdown the active I_T nexus if 'NULL' is passed..
1107 */
1108 if (!strncmp(page, "NULL", 4)) {
1109 ret = tcm_loop_drop_nexus(tl_tpg);
1110 return (!ret) ? count : ret;
1111 }
1112 /*
1113 * Otherwise make sure the passed virtual Initiator port WWN matches
1114 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
1115 * tcm_loop_make_nexus()
1116 */
1117 if (strlen(page) >= TL_WWN_ADDR_LEN) {
1118 pr_err("Emulated NAA Sas Address: %s, exceeds"
1119 " max: %d\n", page, TL_WWN_ADDR_LEN);
1120 return -EINVAL;
1121 }
1122 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
1123
1124 ptr = strstr(i_port, "naa.");
1125 if (ptr) {
1126 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
1127 pr_err("Passed SAS Initiator Port %s does not"
1128 " match target port protoid: %s\n", i_port,
1129 tcm_loop_dump_proto_id(tl_hba));
1130 return -EINVAL;
1131 }
1132 port_ptr = &i_port[0];
1133 goto check_newline;
1134 }
1135 ptr = strstr(i_port, "fc.");
1136 if (ptr) {
1137 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
1138 pr_err("Passed FCP Initiator Port %s does not"
1139 " match target port protoid: %s\n", i_port,
1140 tcm_loop_dump_proto_id(tl_hba));
1141 return -EINVAL;
1142 }
1143 port_ptr = &i_port[3]; /* Skip over "fc." */
1144 goto check_newline;
1145 }
1146 ptr = strstr(i_port, "iqn.");
1147 if (ptr) {
1148 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
1149 pr_err("Passed iSCSI Initiator Port %s does not"
1150 " match target port protoid: %s\n", i_port,
1151 tcm_loop_dump_proto_id(tl_hba));
1152 return -EINVAL;
1153 }
1154 port_ptr = &i_port[0];
1155 goto check_newline;
1156 }
1157 pr_err("Unable to locate prefix for emulated Initiator Port:"
1158 " %s\n", i_port);
1159 return -EINVAL;
1160 /*
1161 * Clear any trailing newline for the NAA WWN
1162 */
1163check_newline:
1164 if (i_port[strlen(i_port)-1] == '\n')
1165 i_port[strlen(i_port)-1] = '\0';
1166
1167 ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
1168 if (ret < 0)
1169 return ret;
1170
1171 return count;
1172}
1173
1174TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR);
1175
1176static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1177 &tcm_loop_tpg_nexus.attr,
1178 NULL,
1179};
1180
1181/* Start items for tcm_loop_naa_cit */
1182
1183struct se_portal_group *tcm_loop_make_naa_tpg(
1184 struct se_wwn *wwn,
1185 struct config_group *group,
1186 const char *name)
1187{
1188 struct tcm_loop_hba *tl_hba = container_of(wwn,
1189 struct tcm_loop_hba, tl_hba_wwn);
1190 struct tcm_loop_tpg *tl_tpg;
1191 char *tpgt_str, *end_ptr;
1192 int ret;
1193 unsigned short int tpgt;
1194
1195 tpgt_str = strstr(name, "tpgt_");
1196 if (!tpgt_str) {
1197 pr_err("Unable to locate \"tpgt_#\" directory"
1198 " group\n");
1199 return ERR_PTR(-EINVAL);
1200 }
1201 tpgt_str += 5; /* Skip ahead of "tpgt_" */
1202 tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0);
1203
1204 if (tpgt >= TL_TPGS_PER_HBA) {
1205 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1206 " %u\n", tpgt, TL_TPGS_PER_HBA);
1207 return ERR_PTR(-EINVAL);
1208 }
1209 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1210 tl_tpg->tl_hba = tl_hba;
1211 tl_tpg->tl_tpgt = tpgt;
1212 /*
1213 * Register the tl_tpg as a emulated SAS TCM Target Endpoint
1214 */
1215 ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops,
1216 wwn, &tl_tpg->tl_se_tpg, tl_tpg,
1217 TRANSPORT_TPG_TYPE_NORMAL);
1218 if (ret < 0)
1219 return ERR_PTR(-ENOMEM);
1220
1221 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1222 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1223 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1224
1225 return &tl_tpg->tl_se_tpg;
1226}
1227
1228void tcm_loop_drop_naa_tpg(
1229 struct se_portal_group *se_tpg)
1230{
1231 struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1232 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1233 struct tcm_loop_tpg, tl_se_tpg);
1234 struct tcm_loop_hba *tl_hba;
1235 unsigned short tpgt;
1236
1237 tl_hba = tl_tpg->tl_hba;
1238 tpgt = tl_tpg->tl_tpgt;
1239 /*
1240 * Release the I_T Nexus for the Virtual SAS link if present
1241 */
1242 tcm_loop_drop_nexus(tl_tpg);
1243 /*
1244 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1245 */
1246 core_tpg_deregister(se_tpg);
1247
1248 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1249 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1250 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1251}
1252
1253/* End items for tcm_loop_naa_cit */
1254
1255/* Start items for tcm_loop_cit */
1256
1257struct se_wwn *tcm_loop_make_scsi_hba(
1258 struct target_fabric_configfs *tf,
1259 struct config_group *group,
1260 const char *name)
1261{
1262 struct tcm_loop_hba *tl_hba;
1263 struct Scsi_Host *sh;
1264 char *ptr;
1265 int ret, off = 0;
1266
1267 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1268 if (!tl_hba) {
1269 pr_err("Unable to allocate struct tcm_loop_hba\n");
1270 return ERR_PTR(-ENOMEM);
1271 }
1272 /*
1273 * Determine the emulated Protocol Identifier and Target Port Name
1274 * based on the incoming configfs directory name.
1275 */
1276 ptr = strstr(name, "naa.");
1277 if (ptr) {
1278 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1279 goto check_len;
1280 }
1281 ptr = strstr(name, "fc.");
1282 if (ptr) {
1283 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1284 off = 3; /* Skip over "fc." */
1285 goto check_len;
1286 }
1287 ptr = strstr(name, "iqn.");
1288 if (!ptr) {
1289 pr_err("Unable to locate prefix for emulated Target "
1290 "Port: %s\n", name);
1291 ret = -EINVAL;
1292 goto out;
1293 }
1294 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1295
1296check_len:
1297 if (strlen(name) >= TL_WWN_ADDR_LEN) {
1298 pr_err("Emulated NAA %s Address: %s, exceeds"
1299 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1300 TL_WWN_ADDR_LEN);
1301 ret = -EINVAL;
1302 goto out;
1303 }
1304 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1305
1306 /*
1307 * Call device_register(tl_hba->dev) to register the emulated
1308 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1309 * device_register() callbacks in tcm_loop_driver_probe()
1310 */
1311 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1312 if (ret)
1313 goto out;
1314
1315 sh = tl_hba->sh;
1316 tcm_loop_hba_no_cnt++;
1317 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1318 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1319 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1320
1321 return &tl_hba->tl_hba_wwn;
1322out:
1323 kfree(tl_hba);
1324 return ERR_PTR(ret);
1325}
1326
1327void tcm_loop_drop_scsi_hba(
1328 struct se_wwn *wwn)
1329{
1330 struct tcm_loop_hba *tl_hba = container_of(wwn,
1331 struct tcm_loop_hba, tl_hba_wwn);
1332 int host_no = tl_hba->sh->host_no;
1333 /*
1334 * Call device_unregister() on the original tl_hba->dev.
1335 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1336 * release *tl_hba;
1337 */
1338 device_unregister(&tl_hba->dev);
1339
1340 pr_debug("TCM_Loop_ConfigFS: Deallocated emulated Target"
1341 " SAS Address: %s at Linux/SCSI Host ID: %d\n",
1342 config_item_name(&wwn->wwn_group.cg_item), host_no);
1343}
1344
1345/* Start items for tcm_loop_cit */
1346static ssize_t tcm_loop_wwn_show_attr_version(
1347 struct target_fabric_configfs *tf,
1348 char *page)
1349{
1350 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1351}
1352
1353TF_WWN_ATTR_RO(tcm_loop, version);
1354
1355static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1356 &tcm_loop_wwn_version.attr,
1357 NULL,
1358};
1359
1360/* End items for tcm_loop_cit */
1361
1362static int tcm_loop_register_configfs(void)
1363{
1364 struct target_fabric_configfs *fabric;
1365 struct config_group *tf_cg;
1366 int ret;
1367 /*
1368 * Set the TCM Loop HBA counter to zero
1369 */
1370 tcm_loop_hba_no_cnt = 0;
1371 /*
1372 * Register the top level struct config_item_type with TCM core
1373 */
1374 fabric = target_fabric_configfs_init(THIS_MODULE, "loopback");
1375 if (IS_ERR(fabric)) {
1376 pr_err("tcm_loop_register_configfs() failed!\n");
1377 return PTR_ERR(fabric);
1378 }
1379 /*
1380 * Setup the fabric API of function pointers used by target_core_mod
1381 */
1382 fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name;
1383 fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident;
1384 fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn;
1385 fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag;
1386 fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth;
1387 fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id;
1388 fabric->tf_ops.tpg_get_pr_transport_id_len =
1389 &tcm_loop_get_pr_transport_id_len;
1390 fabric->tf_ops.tpg_parse_pr_out_transport_id =
1391 &tcm_loop_parse_pr_out_transport_id;
1392 fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode;
1393 fabric->tf_ops.tpg_check_demo_mode_cache =
1394 &tcm_loop_check_demo_mode_cache;
1395 fabric->tf_ops.tpg_check_demo_mode_write_protect =
1396 &tcm_loop_check_demo_mode_write_protect;
1397 fabric->tf_ops.tpg_check_prod_mode_write_protect =
1398 &tcm_loop_check_prod_mode_write_protect;
1399 /*
1400 * The TCM loopback fabric module runs in demo-mode to a local
1401 * virtual SCSI device, so fabric dependent initator ACLs are
1402 * not required.
1403 */
1404 fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl;
1405 fabric->tf_ops.tpg_release_fabric_acl =
1406 &tcm_loop_tpg_release_fabric_acl;
1407 fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index;
1408 /*
1409 * Used for setting up remaining TCM resources in process context
1410 */
1411 fabric->tf_ops.new_cmd_map = &tcm_loop_new_cmd_map;
1412 fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free;
1413 fabric->tf_ops.release_cmd = &tcm_loop_release_cmd;
1414 fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session;
1415 fabric->tf_ops.close_session = &tcm_loop_close_session;
1416 fabric->tf_ops.stop_session = &tcm_loop_stop_session;
1417 fabric->tf_ops.fall_back_to_erl0 = &tcm_loop_fall_back_to_erl0;
1418 fabric->tf_ops.sess_logged_in = &tcm_loop_sess_logged_in;
1419 fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index;
1420 fabric->tf_ops.sess_get_initiator_sid = NULL;
1421 fabric->tf_ops.write_pending = &tcm_loop_write_pending;
1422 fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status;
1423 /*
1424 * Not used for TCM loopback
1425 */
1426 fabric->tf_ops.set_default_node_attributes =
1427 &tcm_loop_set_default_node_attributes;
1428 fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag;
1429 fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state;
1430 fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in;
1431 fabric->tf_ops.queue_status = &tcm_loop_queue_status;
1432 fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp;
1433 fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len;
1434 fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len;
1435 fabric->tf_ops.is_state_remove = &tcm_loop_is_state_remove;
1436
1437 tf_cg = &fabric->tf_group;
1438 /*
1439 * Setup function pointers for generic logic in target_core_fabric_configfs.c
1440 */
1441 fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba;
1442 fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba;
1443 fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg;
1444 fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg;
1445 /*
1446 * fabric_post_link() and fabric_pre_unlink() are used for
1447 * registration and release of TCM Loop Virtual SCSI LUNs.
1448 */
1449 fabric->tf_ops.fabric_post_link = &tcm_loop_port_link;
1450 fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink;
1451 fabric->tf_ops.fabric_make_np = NULL;
1452 fabric->tf_ops.fabric_drop_np = NULL;
1453 /*
1454 * Setup default attribute lists for various fabric->tf_cit_tmpl
1455 */
1456 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs;
1457 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs;
1458 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1459 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1460 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1461 /*
1462 * Once fabric->tf_ops has been setup, now register the fabric for
1463 * use within TCM
1464 */
1465 ret = target_fabric_configfs_register(fabric);
1466 if (ret < 0) {
1467 pr_err("target_fabric_configfs_register() for"
1468 " TCM_Loop failed!\n");
1469 target_fabric_configfs_free(fabric);
1470 return -1;
1471 }
1472 /*
1473 * Setup our local pointer to *fabric.
1474 */
1475 tcm_loop_fabric_configfs = fabric;
1476 pr_debug("TCM_LOOP[0] - Set fabric ->"
1477 " tcm_loop_fabric_configfs\n");
1478 return 0;
1479}
1480
1481static void tcm_loop_deregister_configfs(void)
1482{
1483 if (!tcm_loop_fabric_configfs)
1484 return;
1485
1486 target_fabric_configfs_deregister(tcm_loop_fabric_configfs);
1487 tcm_loop_fabric_configfs = NULL;
1488 pr_debug("TCM_LOOP[0] - Cleared"
1489 " tcm_loop_fabric_configfs\n");
1490}
1491
1492static int __init tcm_loop_fabric_init(void)
1493{
1494 int ret;
1495
1496 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1497 sizeof(struct tcm_loop_cmd),
1498 __alignof__(struct tcm_loop_cmd),
1499 0, NULL);
1500 if (!tcm_loop_cmd_cache) {
1501 pr_debug("kmem_cache_create() for"
1502 " tcm_loop_cmd_cache failed\n");
1503 return -ENOMEM;
1504 }
1505
1506 ret = tcm_loop_alloc_core_bus();
1507 if (ret)
1508 return ret;
1509
1510 ret = tcm_loop_register_configfs();
1511 if (ret) {
1512 tcm_loop_release_core_bus();
1513 return ret;
1514 }
1515
1516 return 0;
1517}
1518
1519static void __exit tcm_loop_fabric_exit(void)
1520{
1521 tcm_loop_deregister_configfs();
1522 tcm_loop_release_core_bus();
1523 kmem_cache_destroy(tcm_loop_cmd_cache);
1524}
1525
1526MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1527MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1528MODULE_LICENSE("GPL");
1529module_init(tcm_loop_fabric_init);
1530module_exit(tcm_loop_fabric_exit);
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#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 */
45static struct target_fabric_configfs *tcm_loop_fabric_configfs;
46
47static struct workqueue_struct *tcm_loop_workqueue;
48static struct kmem_cache *tcm_loop_cmd_cache;
49
50static int tcm_loop_hba_no_cnt;
51
52static int tcm_loop_queue_status(struct se_cmd *se_cmd);
53
54/*
55 * Called from struct target_core_fabric_ops->check_stop_free()
56 */
57static 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
74static 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
82static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
83{
84 seq_printf(m, "tcm_loop_proc_info()\n");
85 return 0;
86}
87
88static int tcm_loop_driver_probe(struct device *);
89static int tcm_loop_driver_remove(struct device *);
90
91static int pseudo_lld_bus_match(struct device *dev,
92 struct device_driver *dev_driver)
93{
94 return 1;
95}
96
97static struct bus_type tcm_loop_lld_bus = {
98 .name = "tcm_loop_bus",
99 .match = pseudo_lld_bus_match,
100 .probe = tcm_loop_driver_probe,
101 .remove = tcm_loop_driver_remove,
102};
103
104static struct device_driver tcm_loop_driverfs = {
105 .name = "tcm_loop",
106 .bus = &tcm_loop_lld_bus,
107};
108/*
109 * Used with root_device_register() in tcm_loop_alloc_core_bus() below
110 */
111struct device *tcm_loop_primary;
112
113/*
114 * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and
115 * drivers/scsi/libiscsi.c:iscsi_change_queue_depth()
116 */
117static int tcm_loop_change_queue_depth(
118 struct scsi_device *sdev,
119 int depth,
120 int reason)
121{
122 switch (reason) {
123 case SCSI_QDEPTH_DEFAULT:
124 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
125 break;
126 case SCSI_QDEPTH_QFULL:
127 scsi_track_queue_full(sdev, depth);
128 break;
129 case SCSI_QDEPTH_RAMP_UP:
130 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
131 break;
132 default:
133 return -EOPNOTSUPP;
134 }
135 return sdev->queue_depth;
136}
137
138static int tcm_loop_change_queue_type(struct scsi_device *sdev, int tag)
139{
140 if (sdev->tagged_supported) {
141 scsi_set_tag_type(sdev, tag);
142
143 if (tag)
144 scsi_activate_tcq(sdev, sdev->queue_depth);
145 else
146 scsi_deactivate_tcq(sdev, sdev->queue_depth);
147 } else
148 tag = 0;
149
150 return tag;
151}
152
153/*
154 * Locate the SAM Task Attr from struct scsi_cmnd *
155 */
156static int tcm_loop_sam_attr(struct scsi_cmnd *sc)
157{
158 if (sc->device->tagged_supported) {
159 switch (sc->tag) {
160 case HEAD_OF_QUEUE_TAG:
161 return MSG_HEAD_TAG;
162 case ORDERED_QUEUE_TAG:
163 return MSG_ORDERED_TAG;
164 default:
165 break;
166 }
167 }
168
169 return MSG_SIMPLE_TAG;
170}
171
172static void tcm_loop_submission_work(struct work_struct *work)
173{
174 struct tcm_loop_cmd *tl_cmd =
175 container_of(work, struct tcm_loop_cmd, work);
176 struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
177 struct scsi_cmnd *sc = tl_cmd->sc;
178 struct tcm_loop_nexus *tl_nexus;
179 struct tcm_loop_hba *tl_hba;
180 struct tcm_loop_tpg *tl_tpg;
181 struct scatterlist *sgl_bidi = NULL;
182 u32 sgl_bidi_count = 0;
183 int rc;
184
185 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
186 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
187
188 /*
189 * Ensure that this tl_tpg reference from the incoming sc->device->id
190 * has already been configured via tcm_loop_make_naa_tpg().
191 */
192 if (!tl_tpg->tl_hba) {
193 set_host_byte(sc, DID_NO_CONNECT);
194 goto out_done;
195 }
196 if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
197 set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
198 goto out_done;
199 }
200 tl_nexus = tl_hba->tl_nexus;
201 if (!tl_nexus) {
202 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
203 " does not exist\n");
204 set_host_byte(sc, DID_ERROR);
205 goto out_done;
206 }
207 if (scsi_bidi_cmnd(sc)) {
208 struct scsi_data_buffer *sdb = scsi_in(sc);
209
210 sgl_bidi = sdb->table.sgl;
211 sgl_bidi_count = sdb->table.nents;
212 se_cmd->se_cmd_flags |= SCF_BIDI;
213
214 }
215
216 if (!scsi_prot_sg_count(sc) && scsi_get_prot_op(sc) != SCSI_PROT_NORMAL)
217 se_cmd->prot_pto = true;
218
219 rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
220 &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
221 scsi_bufflen(sc), tcm_loop_sam_attr(sc),
222 sc->sc_data_direction, 0,
223 scsi_sglist(sc), scsi_sg_count(sc),
224 sgl_bidi, sgl_bidi_count,
225 scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
226 if (rc < 0) {
227 set_host_byte(sc, DID_NO_CONNECT);
228 goto out_done;
229 }
230 return;
231
232out_done:
233 sc->scsi_done(sc);
234 return;
235}
236
237/*
238 * ->queuecommand can be and usually is called from interrupt context, so
239 * defer the actual submission to a workqueue.
240 */
241static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
242{
243 struct tcm_loop_cmd *tl_cmd;
244
245 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x"
246 " scsi_buf_len: %u\n", sc->device->host->host_no,
247 sc->device->id, sc->device->channel, sc->device->lun,
248 sc->cmnd[0], scsi_bufflen(sc));
249
250 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
251 if (!tl_cmd) {
252 pr_err("Unable to allocate struct tcm_loop_cmd\n");
253 set_host_byte(sc, DID_ERROR);
254 sc->scsi_done(sc);
255 return 0;
256 }
257
258 tl_cmd->sc = sc;
259 tl_cmd->sc_cmd_tag = sc->tag;
260 INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
261 queue_work(tcm_loop_workqueue, &tl_cmd->work);
262 return 0;
263}
264
265/*
266 * Called from SCSI EH process context to issue a LUN_RESET TMR
267 * to struct scsi_device
268 */
269static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
270 struct tcm_loop_nexus *tl_nexus,
271 int lun, int task, enum tcm_tmreq_table tmr)
272{
273 struct se_cmd *se_cmd = NULL;
274 struct se_session *se_sess;
275 struct se_portal_group *se_tpg;
276 struct tcm_loop_cmd *tl_cmd = NULL;
277 struct tcm_loop_tmr *tl_tmr = NULL;
278 int ret = TMR_FUNCTION_FAILED, rc;
279
280 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
281 if (!tl_cmd) {
282 pr_err("Unable to allocate memory for tl_cmd\n");
283 return ret;
284 }
285
286 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
287 if (!tl_tmr) {
288 pr_err("Unable to allocate memory for tl_tmr\n");
289 goto release;
290 }
291 init_waitqueue_head(&tl_tmr->tl_tmr_wait);
292
293 se_cmd = &tl_cmd->tl_se_cmd;
294 se_tpg = &tl_tpg->tl_se_tpg;
295 se_sess = tl_nexus->se_sess;
296 /*
297 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
298 */
299 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
300 DMA_NONE, MSG_SIMPLE_TAG,
301 &tl_cmd->tl_sense_buf[0]);
302
303 rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL);
304 if (rc < 0)
305 goto release;
306
307 if (tmr == TMR_ABORT_TASK)
308 se_cmd->se_tmr_req->ref_task_tag = task;
309
310 /*
311 * Locate the underlying TCM struct se_lun
312 */
313 if (transport_lookup_tmr_lun(se_cmd, lun) < 0) {
314 ret = TMR_LUN_DOES_NOT_EXIST;
315 goto release;
316 }
317 /*
318 * Queue the TMR to TCM Core and sleep waiting for
319 * tcm_loop_queue_tm_rsp() to wake us up.
320 */
321 transport_generic_handle_tmr(se_cmd);
322 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
323 /*
324 * The TMR LUN_RESET has completed, check the response status and
325 * then release allocations.
326 */
327 ret = se_cmd->se_tmr_req->response;
328release:
329 if (se_cmd)
330 transport_generic_free_cmd(se_cmd, 1);
331 else
332 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
333 kfree(tl_tmr);
334 return ret;
335}
336
337static int tcm_loop_abort_task(struct scsi_cmnd *sc)
338{
339 struct tcm_loop_hba *tl_hba;
340 struct tcm_loop_nexus *tl_nexus;
341 struct tcm_loop_tpg *tl_tpg;
342 int ret = FAILED;
343
344 /*
345 * Locate the tcm_loop_hba_t pointer
346 */
347 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
348 /*
349 * Locate the tl_nexus and se_sess pointers
350 */
351 tl_nexus = tl_hba->tl_nexus;
352 if (!tl_nexus) {
353 pr_err("Unable to perform device reset without"
354 " active I_T Nexus\n");
355 return FAILED;
356 }
357
358 /*
359 * Locate the tl_tpg pointer from TargetID in sc->device->id
360 */
361 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
362 ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun,
363 sc->tag, TMR_ABORT_TASK);
364 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
365}
366
367/*
368 * Called from SCSI EH process context to issue a LUN_RESET TMR
369 * to struct scsi_device
370 */
371static int tcm_loop_device_reset(struct scsi_cmnd *sc)
372{
373 struct tcm_loop_hba *tl_hba;
374 struct tcm_loop_nexus *tl_nexus;
375 struct tcm_loop_tpg *tl_tpg;
376 int ret = FAILED;
377
378 /*
379 * Locate the tcm_loop_hba_t pointer
380 */
381 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
382 /*
383 * Locate the tl_nexus and se_sess pointers
384 */
385 tl_nexus = tl_hba->tl_nexus;
386 if (!tl_nexus) {
387 pr_err("Unable to perform device reset without"
388 " active I_T Nexus\n");
389 return FAILED;
390 }
391 /*
392 * Locate the tl_tpg pointer from TargetID in sc->device->id
393 */
394 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
395 ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun,
396 0, TMR_LUN_RESET);
397 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
398}
399
400static int tcm_loop_target_reset(struct scsi_cmnd *sc)
401{
402 struct tcm_loop_hba *tl_hba;
403 struct tcm_loop_tpg *tl_tpg;
404
405 /*
406 * Locate the tcm_loop_hba_t pointer
407 */
408 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
409 if (!tl_hba) {
410 pr_err("Unable to perform device reset without"
411 " active I_T Nexus\n");
412 return FAILED;
413 }
414 /*
415 * Locate the tl_tpg pointer from TargetID in sc->device->id
416 */
417 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
418 if (tl_tpg) {
419 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
420 return SUCCESS;
421 }
422 return FAILED;
423}
424
425static int tcm_loop_slave_alloc(struct scsi_device *sd)
426{
427 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
428 return 0;
429}
430
431static int tcm_loop_slave_configure(struct scsi_device *sd)
432{
433 if (sd->tagged_supported) {
434 scsi_activate_tcq(sd, sd->queue_depth);
435 scsi_adjust_queue_depth(sd, MSG_SIMPLE_TAG,
436 sd->host->cmd_per_lun);
437 } else {
438 scsi_adjust_queue_depth(sd, 0,
439 sd->host->cmd_per_lun);
440 }
441
442 return 0;
443}
444
445static struct scsi_host_template tcm_loop_driver_template = {
446 .show_info = tcm_loop_show_info,
447 .proc_name = "tcm_loopback",
448 .name = "TCM_Loopback",
449 .queuecommand = tcm_loop_queuecommand,
450 .change_queue_depth = tcm_loop_change_queue_depth,
451 .change_queue_type = tcm_loop_change_queue_type,
452 .eh_abort_handler = tcm_loop_abort_task,
453 .eh_device_reset_handler = tcm_loop_device_reset,
454 .eh_target_reset_handler = tcm_loop_target_reset,
455 .can_queue = 1024,
456 .this_id = -1,
457 .sg_tablesize = 256,
458 .cmd_per_lun = 1024,
459 .max_sectors = 0xFFFF,
460 .use_clustering = DISABLE_CLUSTERING,
461 .slave_alloc = tcm_loop_slave_alloc,
462 .slave_configure = tcm_loop_slave_configure,
463 .module = THIS_MODULE,
464};
465
466static int tcm_loop_driver_probe(struct device *dev)
467{
468 struct tcm_loop_hba *tl_hba;
469 struct Scsi_Host *sh;
470 int error, host_prot;
471
472 tl_hba = to_tcm_loop_hba(dev);
473
474 sh = scsi_host_alloc(&tcm_loop_driver_template,
475 sizeof(struct tcm_loop_hba));
476 if (!sh) {
477 pr_err("Unable to allocate struct scsi_host\n");
478 return -ENODEV;
479 }
480 tl_hba->sh = sh;
481
482 /*
483 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
484 */
485 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
486 /*
487 * Setup single ID, Channel and LUN for now..
488 */
489 sh->max_id = 2;
490 sh->max_lun = 0;
491 sh->max_channel = 0;
492 sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN;
493
494 host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
495 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
496 SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
497
498 scsi_host_set_prot(sh, host_prot);
499 scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
500
501 error = scsi_add_host(sh, &tl_hba->dev);
502 if (error) {
503 pr_err("%s: scsi_add_host failed\n", __func__);
504 scsi_host_put(sh);
505 return -ENODEV;
506 }
507 return 0;
508}
509
510static int tcm_loop_driver_remove(struct device *dev)
511{
512 struct tcm_loop_hba *tl_hba;
513 struct Scsi_Host *sh;
514
515 tl_hba = to_tcm_loop_hba(dev);
516 sh = tl_hba->sh;
517
518 scsi_remove_host(sh);
519 scsi_host_put(sh);
520 return 0;
521}
522
523static void tcm_loop_release_adapter(struct device *dev)
524{
525 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
526
527 kfree(tl_hba);
528}
529
530/*
531 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
532 */
533static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
534{
535 int ret;
536
537 tl_hba->dev.bus = &tcm_loop_lld_bus;
538 tl_hba->dev.parent = tcm_loop_primary;
539 tl_hba->dev.release = &tcm_loop_release_adapter;
540 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
541
542 ret = device_register(&tl_hba->dev);
543 if (ret) {
544 pr_err("device_register() failed for"
545 " tl_hba->dev: %d\n", ret);
546 return -ENODEV;
547 }
548
549 return 0;
550}
551
552/*
553 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
554 * tcm_loop SCSI bus.
555 */
556static int tcm_loop_alloc_core_bus(void)
557{
558 int ret;
559
560 tcm_loop_primary = root_device_register("tcm_loop_0");
561 if (IS_ERR(tcm_loop_primary)) {
562 pr_err("Unable to allocate tcm_loop_primary\n");
563 return PTR_ERR(tcm_loop_primary);
564 }
565
566 ret = bus_register(&tcm_loop_lld_bus);
567 if (ret) {
568 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
569 goto dev_unreg;
570 }
571
572 ret = driver_register(&tcm_loop_driverfs);
573 if (ret) {
574 pr_err("driver_register() failed for"
575 "tcm_loop_driverfs\n");
576 goto bus_unreg;
577 }
578
579 pr_debug("Initialized TCM Loop Core Bus\n");
580 return ret;
581
582bus_unreg:
583 bus_unregister(&tcm_loop_lld_bus);
584dev_unreg:
585 root_device_unregister(tcm_loop_primary);
586 return ret;
587}
588
589static void tcm_loop_release_core_bus(void)
590{
591 driver_unregister(&tcm_loop_driverfs);
592 bus_unregister(&tcm_loop_lld_bus);
593 root_device_unregister(tcm_loop_primary);
594
595 pr_debug("Releasing TCM Loop Core BUS\n");
596}
597
598static char *tcm_loop_get_fabric_name(void)
599{
600 return "loopback";
601}
602
603static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg)
604{
605 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
606 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
607 /*
608 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
609 * time based on the protocol dependent prefix of the passed configfs group.
610 *
611 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric
612 * ProtocolID using target_core_fabric_lib.c symbols.
613 */
614 switch (tl_hba->tl_proto_id) {
615 case SCSI_PROTOCOL_SAS:
616 return sas_get_fabric_proto_ident(se_tpg);
617 case SCSI_PROTOCOL_FCP:
618 return fc_get_fabric_proto_ident(se_tpg);
619 case SCSI_PROTOCOL_ISCSI:
620 return iscsi_get_fabric_proto_ident(se_tpg);
621 default:
622 pr_err("Unknown tl_proto_id: 0x%02x, using"
623 " SAS emulation\n", tl_hba->tl_proto_id);
624 break;
625 }
626
627 return sas_get_fabric_proto_ident(se_tpg);
628}
629
630static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
631{
632 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
633 /*
634 * Return the passed NAA identifier for the SAS Target Port
635 */
636 return &tl_tpg->tl_hba->tl_wwn_address[0];
637}
638
639static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
640{
641 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
642 /*
643 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
644 * to represent the SCSI Target Port.
645 */
646 return tl_tpg->tl_tpgt;
647}
648
649static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg)
650{
651 return 1;
652}
653
654static u32 tcm_loop_get_pr_transport_id(
655 struct se_portal_group *se_tpg,
656 struct se_node_acl *se_nacl,
657 struct t10_pr_registration *pr_reg,
658 int *format_code,
659 unsigned char *buf)
660{
661 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
662 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
663
664 switch (tl_hba->tl_proto_id) {
665 case SCSI_PROTOCOL_SAS:
666 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
667 format_code, buf);
668 case SCSI_PROTOCOL_FCP:
669 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
670 format_code, buf);
671 case SCSI_PROTOCOL_ISCSI:
672 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
673 format_code, buf);
674 default:
675 pr_err("Unknown tl_proto_id: 0x%02x, using"
676 " SAS emulation\n", tl_hba->tl_proto_id);
677 break;
678 }
679
680 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
681 format_code, buf);
682}
683
684static u32 tcm_loop_get_pr_transport_id_len(
685 struct se_portal_group *se_tpg,
686 struct se_node_acl *se_nacl,
687 struct t10_pr_registration *pr_reg,
688 int *format_code)
689{
690 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
691 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
692
693 switch (tl_hba->tl_proto_id) {
694 case SCSI_PROTOCOL_SAS:
695 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
696 format_code);
697 case SCSI_PROTOCOL_FCP:
698 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
699 format_code);
700 case SCSI_PROTOCOL_ISCSI:
701 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
702 format_code);
703 default:
704 pr_err("Unknown tl_proto_id: 0x%02x, using"
705 " SAS emulation\n", tl_hba->tl_proto_id);
706 break;
707 }
708
709 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
710 format_code);
711}
712
713/*
714 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
715 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
716 */
717static char *tcm_loop_parse_pr_out_transport_id(
718 struct se_portal_group *se_tpg,
719 const char *buf,
720 u32 *out_tid_len,
721 char **port_nexus_ptr)
722{
723 struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr;
724 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
725
726 switch (tl_hba->tl_proto_id) {
727 case SCSI_PROTOCOL_SAS:
728 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
729 port_nexus_ptr);
730 case SCSI_PROTOCOL_FCP:
731 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
732 port_nexus_ptr);
733 case SCSI_PROTOCOL_ISCSI:
734 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
735 port_nexus_ptr);
736 default:
737 pr_err("Unknown tl_proto_id: 0x%02x, using"
738 " SAS emulation\n", tl_hba->tl_proto_id);
739 break;
740 }
741
742 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
743 port_nexus_ptr);
744}
745
746/*
747 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
748 * based upon the incoming fabric dependent SCSI Initiator Port
749 */
750static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
751{
752 return 1;
753}
754
755static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
756{
757 return 0;
758}
759
760/*
761 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
762 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
763 */
764static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
765{
766 return 0;
767}
768
769/*
770 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
771 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
772 * It has been added here as a nop for target_fabric_tf_ops_check()
773 */
774static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
775{
776 return 0;
777}
778
779static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl(
780 struct se_portal_group *se_tpg)
781{
782 struct tcm_loop_nacl *tl_nacl;
783
784 tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL);
785 if (!tl_nacl) {
786 pr_err("Unable to allocate struct tcm_loop_nacl\n");
787 return NULL;
788 }
789
790 return &tl_nacl->se_node_acl;
791}
792
793static void tcm_loop_tpg_release_fabric_acl(
794 struct se_portal_group *se_tpg,
795 struct se_node_acl *se_nacl)
796{
797 struct tcm_loop_nacl *tl_nacl = container_of(se_nacl,
798 struct tcm_loop_nacl, se_node_acl);
799
800 kfree(tl_nacl);
801}
802
803static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
804{
805 return 1;
806}
807
808static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
809{
810 return 1;
811}
812
813static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
814{
815 return;
816}
817
818static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
819{
820 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
821 struct tcm_loop_cmd, tl_se_cmd);
822
823 return tl_cmd->sc_cmd_tag;
824}
825
826static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
827{
828 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
829 struct tcm_loop_cmd, tl_se_cmd);
830
831 return tl_cmd->sc_cmd_state;
832}
833
834static int tcm_loop_shutdown_session(struct se_session *se_sess)
835{
836 return 0;
837}
838
839static void tcm_loop_close_session(struct se_session *se_sess)
840{
841 return;
842};
843
844static int tcm_loop_write_pending(struct se_cmd *se_cmd)
845{
846 /*
847 * Since Linux/SCSI has already sent down a struct scsi_cmnd
848 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
849 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
850 * format with transport_generic_map_mem_to_cmd().
851 *
852 * We now tell TCM to add this WRITE CDB directly into the TCM storage
853 * object execution queue.
854 */
855 target_execute_cmd(se_cmd);
856 return 0;
857}
858
859static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
860{
861 return 0;
862}
863
864static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
865{
866 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
867 struct tcm_loop_cmd, tl_se_cmd);
868 struct scsi_cmnd *sc = tl_cmd->sc;
869
870 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
871 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
872
873 sc->result = SAM_STAT_GOOD;
874 set_host_byte(sc, DID_OK);
875 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
876 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
877 scsi_set_resid(sc, se_cmd->residual_count);
878 sc->scsi_done(sc);
879 return 0;
880}
881
882static int tcm_loop_queue_status(struct se_cmd *se_cmd)
883{
884 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
885 struct tcm_loop_cmd, tl_se_cmd);
886 struct scsi_cmnd *sc = tl_cmd->sc;
887
888 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
889 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
890
891 if (se_cmd->sense_buffer &&
892 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
893 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
894
895 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
896 SCSI_SENSE_BUFFERSIZE);
897 sc->result = SAM_STAT_CHECK_CONDITION;
898 set_driver_byte(sc, DRIVER_SENSE);
899 } else
900 sc->result = se_cmd->scsi_status;
901
902 set_host_byte(sc, DID_OK);
903 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
904 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
905 scsi_set_resid(sc, se_cmd->residual_count);
906 sc->scsi_done(sc);
907 return 0;
908}
909
910static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
911{
912 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
913 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
914 /*
915 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
916 * and wake up the wait_queue_head_t in tcm_loop_device_reset()
917 */
918 atomic_set(&tl_tmr->tmr_complete, 1);
919 wake_up(&tl_tmr->tl_tmr_wait);
920}
921
922static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
923{
924 return;
925}
926
927static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
928{
929 switch (tl_hba->tl_proto_id) {
930 case SCSI_PROTOCOL_SAS:
931 return "SAS";
932 case SCSI_PROTOCOL_FCP:
933 return "FCP";
934 case SCSI_PROTOCOL_ISCSI:
935 return "iSCSI";
936 default:
937 break;
938 }
939
940 return "Unknown";
941}
942
943/* Start items for tcm_loop_port_cit */
944
945static int tcm_loop_port_link(
946 struct se_portal_group *se_tpg,
947 struct se_lun *lun)
948{
949 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
950 struct tcm_loop_tpg, tl_se_tpg);
951 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
952
953 atomic_inc(&tl_tpg->tl_tpg_port_count);
954 smp_mb__after_atomic_inc();
955 /*
956 * Add Linux/SCSI struct scsi_device by HCTL
957 */
958 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
959
960 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
961 return 0;
962}
963
964static void tcm_loop_port_unlink(
965 struct se_portal_group *se_tpg,
966 struct se_lun *se_lun)
967{
968 struct scsi_device *sd;
969 struct tcm_loop_hba *tl_hba;
970 struct tcm_loop_tpg *tl_tpg;
971
972 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
973 tl_hba = tl_tpg->tl_hba;
974
975 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
976 se_lun->unpacked_lun);
977 if (!sd) {
978 pr_err("Unable to locate struct scsi_device for %d:%d:"
979 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
980 return;
981 }
982 /*
983 * Remove Linux/SCSI struct scsi_device by HCTL
984 */
985 scsi_remove_device(sd);
986 scsi_device_put(sd);
987
988 atomic_dec(&tl_tpg->tl_tpg_port_count);
989 smp_mb__after_atomic_dec();
990
991 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
992}
993
994/* End items for tcm_loop_port_cit */
995
996/* Start items for tcm_loop_nexus_cit */
997
998static int tcm_loop_make_nexus(
999 struct tcm_loop_tpg *tl_tpg,
1000 const char *name)
1001{
1002 struct se_portal_group *se_tpg;
1003 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1004 struct tcm_loop_nexus *tl_nexus;
1005 int ret = -ENOMEM;
1006
1007 if (tl_tpg->tl_hba->tl_nexus) {
1008 pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n");
1009 return -EEXIST;
1010 }
1011 se_tpg = &tl_tpg->tl_se_tpg;
1012
1013 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
1014 if (!tl_nexus) {
1015 pr_err("Unable to allocate struct tcm_loop_nexus\n");
1016 return -ENOMEM;
1017 }
1018 /*
1019 * Initialize the struct se_session pointer
1020 */
1021 tl_nexus->se_sess = transport_init_session(TARGET_PROT_ALL);
1022 if (IS_ERR(tl_nexus->se_sess)) {
1023 ret = PTR_ERR(tl_nexus->se_sess);
1024 goto out;
1025 }
1026 /*
1027 * Since we are running in 'demo mode' this call with generate a
1028 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
1029 * Initiator port name of the passed configfs group 'name'.
1030 */
1031 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1032 se_tpg, (unsigned char *)name);
1033 if (!tl_nexus->se_sess->se_node_acl) {
1034 transport_free_session(tl_nexus->se_sess);
1035 goto out;
1036 }
1037 /*
1038 * Now, register the SAS I_T Nexus as active with the call to
1039 * transport_register_session()
1040 */
1041 __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
1042 tl_nexus->se_sess, tl_nexus);
1043 tl_tpg->tl_hba->tl_nexus = tl_nexus;
1044 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
1045 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1046 name);
1047 return 0;
1048
1049out:
1050 kfree(tl_nexus);
1051 return ret;
1052}
1053
1054static int tcm_loop_drop_nexus(
1055 struct tcm_loop_tpg *tpg)
1056{
1057 struct se_session *se_sess;
1058 struct tcm_loop_nexus *tl_nexus;
1059 struct tcm_loop_hba *tl_hba = tpg->tl_hba;
1060
1061 if (!tl_hba)
1062 return -ENODEV;
1063
1064 tl_nexus = tl_hba->tl_nexus;
1065 if (!tl_nexus)
1066 return -ENODEV;
1067
1068 se_sess = tl_nexus->se_sess;
1069 if (!se_sess)
1070 return -ENODEV;
1071
1072 if (atomic_read(&tpg->tl_tpg_port_count)) {
1073 pr_err("Unable to remove TCM_Loop I_T Nexus with"
1074 " active TPG port count: %d\n",
1075 atomic_read(&tpg->tl_tpg_port_count));
1076 return -EPERM;
1077 }
1078
1079 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
1080 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1081 tl_nexus->se_sess->se_node_acl->initiatorname);
1082 /*
1083 * Release the SCSI I_T Nexus to the emulated SAS Target Port
1084 */
1085 transport_deregister_session(tl_nexus->se_sess);
1086 tpg->tl_hba->tl_nexus = NULL;
1087 kfree(tl_nexus);
1088 return 0;
1089}
1090
1091/* End items for tcm_loop_nexus_cit */
1092
1093static ssize_t tcm_loop_tpg_show_nexus(
1094 struct se_portal_group *se_tpg,
1095 char *page)
1096{
1097 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1098 struct tcm_loop_tpg, tl_se_tpg);
1099 struct tcm_loop_nexus *tl_nexus;
1100 ssize_t ret;
1101
1102 tl_nexus = tl_tpg->tl_hba->tl_nexus;
1103 if (!tl_nexus)
1104 return -ENODEV;
1105
1106 ret = snprintf(page, PAGE_SIZE, "%s\n",
1107 tl_nexus->se_sess->se_node_acl->initiatorname);
1108
1109 return ret;
1110}
1111
1112static ssize_t tcm_loop_tpg_store_nexus(
1113 struct se_portal_group *se_tpg,
1114 const char *page,
1115 size_t count)
1116{
1117 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1118 struct tcm_loop_tpg, tl_se_tpg);
1119 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1120 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
1121 int ret;
1122 /*
1123 * Shutdown the active I_T nexus if 'NULL' is passed..
1124 */
1125 if (!strncmp(page, "NULL", 4)) {
1126 ret = tcm_loop_drop_nexus(tl_tpg);
1127 return (!ret) ? count : ret;
1128 }
1129 /*
1130 * Otherwise make sure the passed virtual Initiator port WWN matches
1131 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
1132 * tcm_loop_make_nexus()
1133 */
1134 if (strlen(page) >= TL_WWN_ADDR_LEN) {
1135 pr_err("Emulated NAA Sas Address: %s, exceeds"
1136 " max: %d\n", page, TL_WWN_ADDR_LEN);
1137 return -EINVAL;
1138 }
1139 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
1140
1141 ptr = strstr(i_port, "naa.");
1142 if (ptr) {
1143 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
1144 pr_err("Passed SAS Initiator Port %s does not"
1145 " match target port protoid: %s\n", i_port,
1146 tcm_loop_dump_proto_id(tl_hba));
1147 return -EINVAL;
1148 }
1149 port_ptr = &i_port[0];
1150 goto check_newline;
1151 }
1152 ptr = strstr(i_port, "fc.");
1153 if (ptr) {
1154 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
1155 pr_err("Passed FCP Initiator Port %s does not"
1156 " match target port protoid: %s\n", i_port,
1157 tcm_loop_dump_proto_id(tl_hba));
1158 return -EINVAL;
1159 }
1160 port_ptr = &i_port[3]; /* Skip over "fc." */
1161 goto check_newline;
1162 }
1163 ptr = strstr(i_port, "iqn.");
1164 if (ptr) {
1165 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
1166 pr_err("Passed iSCSI Initiator Port %s does not"
1167 " match target port protoid: %s\n", i_port,
1168 tcm_loop_dump_proto_id(tl_hba));
1169 return -EINVAL;
1170 }
1171 port_ptr = &i_port[0];
1172 goto check_newline;
1173 }
1174 pr_err("Unable to locate prefix for emulated Initiator Port:"
1175 " %s\n", i_port);
1176 return -EINVAL;
1177 /*
1178 * Clear any trailing newline for the NAA WWN
1179 */
1180check_newline:
1181 if (i_port[strlen(i_port)-1] == '\n')
1182 i_port[strlen(i_port)-1] = '\0';
1183
1184 ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
1185 if (ret < 0)
1186 return ret;
1187
1188 return count;
1189}
1190
1191TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR);
1192
1193static ssize_t tcm_loop_tpg_show_transport_status(
1194 struct se_portal_group *se_tpg,
1195 char *page)
1196{
1197 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1198 struct tcm_loop_tpg, tl_se_tpg);
1199 const char *status = NULL;
1200 ssize_t ret = -EINVAL;
1201
1202 switch (tl_tpg->tl_transport_status) {
1203 case TCM_TRANSPORT_ONLINE:
1204 status = "online";
1205 break;
1206 case TCM_TRANSPORT_OFFLINE:
1207 status = "offline";
1208 break;
1209 default:
1210 break;
1211 }
1212
1213 if (status)
1214 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
1215
1216 return ret;
1217}
1218
1219static ssize_t tcm_loop_tpg_store_transport_status(
1220 struct se_portal_group *se_tpg,
1221 const char *page,
1222 size_t count)
1223{
1224 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1225 struct tcm_loop_tpg, tl_se_tpg);
1226
1227 if (!strncmp(page, "online", 6)) {
1228 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
1229 return count;
1230 }
1231 if (!strncmp(page, "offline", 7)) {
1232 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
1233 return count;
1234 }
1235 return -EINVAL;
1236}
1237
1238TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR);
1239
1240static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1241 &tcm_loop_tpg_nexus.attr,
1242 &tcm_loop_tpg_transport_status.attr,
1243 NULL,
1244};
1245
1246/* Start items for tcm_loop_naa_cit */
1247
1248static struct se_portal_group *tcm_loop_make_naa_tpg(
1249 struct se_wwn *wwn,
1250 struct config_group *group,
1251 const char *name)
1252{
1253 struct tcm_loop_hba *tl_hba = container_of(wwn,
1254 struct tcm_loop_hba, tl_hba_wwn);
1255 struct tcm_loop_tpg *tl_tpg;
1256 char *tpgt_str, *end_ptr;
1257 int ret;
1258 unsigned short int tpgt;
1259
1260 tpgt_str = strstr(name, "tpgt_");
1261 if (!tpgt_str) {
1262 pr_err("Unable to locate \"tpgt_#\" directory"
1263 " group\n");
1264 return ERR_PTR(-EINVAL);
1265 }
1266 tpgt_str += 5; /* Skip ahead of "tpgt_" */
1267 tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0);
1268
1269 if (tpgt >= TL_TPGS_PER_HBA) {
1270 pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1271 " %u\n", tpgt, TL_TPGS_PER_HBA);
1272 return ERR_PTR(-EINVAL);
1273 }
1274 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1275 tl_tpg->tl_hba = tl_hba;
1276 tl_tpg->tl_tpgt = tpgt;
1277 /*
1278 * Register the tl_tpg as a emulated SAS TCM Target Endpoint
1279 */
1280 ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops,
1281 wwn, &tl_tpg->tl_se_tpg, tl_tpg,
1282 TRANSPORT_TPG_TYPE_NORMAL);
1283 if (ret < 0)
1284 return ERR_PTR(-ENOMEM);
1285
1286 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1287 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1288 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1289
1290 return &tl_tpg->tl_se_tpg;
1291}
1292
1293static void tcm_loop_drop_naa_tpg(
1294 struct se_portal_group *se_tpg)
1295{
1296 struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1297 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1298 struct tcm_loop_tpg, tl_se_tpg);
1299 struct tcm_loop_hba *tl_hba;
1300 unsigned short tpgt;
1301
1302 tl_hba = tl_tpg->tl_hba;
1303 tpgt = tl_tpg->tl_tpgt;
1304 /*
1305 * Release the I_T Nexus for the Virtual SAS link if present
1306 */
1307 tcm_loop_drop_nexus(tl_tpg);
1308 /*
1309 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1310 */
1311 core_tpg_deregister(se_tpg);
1312
1313 tl_tpg->tl_hba = NULL;
1314 tl_tpg->tl_tpgt = 0;
1315
1316 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1317 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1318 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1319}
1320
1321/* End items for tcm_loop_naa_cit */
1322
1323/* Start items for tcm_loop_cit */
1324
1325static struct se_wwn *tcm_loop_make_scsi_hba(
1326 struct target_fabric_configfs *tf,
1327 struct config_group *group,
1328 const char *name)
1329{
1330 struct tcm_loop_hba *tl_hba;
1331 struct Scsi_Host *sh;
1332 char *ptr;
1333 int ret, off = 0;
1334
1335 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1336 if (!tl_hba) {
1337 pr_err("Unable to allocate struct tcm_loop_hba\n");
1338 return ERR_PTR(-ENOMEM);
1339 }
1340 /*
1341 * Determine the emulated Protocol Identifier and Target Port Name
1342 * based on the incoming configfs directory name.
1343 */
1344 ptr = strstr(name, "naa.");
1345 if (ptr) {
1346 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1347 goto check_len;
1348 }
1349 ptr = strstr(name, "fc.");
1350 if (ptr) {
1351 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1352 off = 3; /* Skip over "fc." */
1353 goto check_len;
1354 }
1355 ptr = strstr(name, "iqn.");
1356 if (!ptr) {
1357 pr_err("Unable to locate prefix for emulated Target "
1358 "Port: %s\n", name);
1359 ret = -EINVAL;
1360 goto out;
1361 }
1362 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1363
1364check_len:
1365 if (strlen(name) >= TL_WWN_ADDR_LEN) {
1366 pr_err("Emulated NAA %s Address: %s, exceeds"
1367 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1368 TL_WWN_ADDR_LEN);
1369 ret = -EINVAL;
1370 goto out;
1371 }
1372 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1373
1374 /*
1375 * Call device_register(tl_hba->dev) to register the emulated
1376 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1377 * device_register() callbacks in tcm_loop_driver_probe()
1378 */
1379 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1380 if (ret)
1381 goto out;
1382
1383 sh = tl_hba->sh;
1384 tcm_loop_hba_no_cnt++;
1385 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1386 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1387 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1388
1389 return &tl_hba->tl_hba_wwn;
1390out:
1391 kfree(tl_hba);
1392 return ERR_PTR(ret);
1393}
1394
1395static void tcm_loop_drop_scsi_hba(
1396 struct se_wwn *wwn)
1397{
1398 struct tcm_loop_hba *tl_hba = container_of(wwn,
1399 struct tcm_loop_hba, tl_hba_wwn);
1400
1401 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1402 " SAS Address: %s at Linux/SCSI Host ID: %d\n",
1403 tl_hba->tl_wwn_address, tl_hba->sh->host_no);
1404 /*
1405 * Call device_unregister() on the original tl_hba->dev.
1406 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1407 * release *tl_hba;
1408 */
1409 device_unregister(&tl_hba->dev);
1410}
1411
1412/* Start items for tcm_loop_cit */
1413static ssize_t tcm_loop_wwn_show_attr_version(
1414 struct target_fabric_configfs *tf,
1415 char *page)
1416{
1417 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1418}
1419
1420TF_WWN_ATTR_RO(tcm_loop, version);
1421
1422static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1423 &tcm_loop_wwn_version.attr,
1424 NULL,
1425};
1426
1427/* End items for tcm_loop_cit */
1428
1429static int tcm_loop_register_configfs(void)
1430{
1431 struct target_fabric_configfs *fabric;
1432 int ret;
1433 /*
1434 * Set the TCM Loop HBA counter to zero
1435 */
1436 tcm_loop_hba_no_cnt = 0;
1437 /*
1438 * Register the top level struct config_item_type with TCM core
1439 */
1440 fabric = target_fabric_configfs_init(THIS_MODULE, "loopback");
1441 if (IS_ERR(fabric)) {
1442 pr_err("tcm_loop_register_configfs() failed!\n");
1443 return PTR_ERR(fabric);
1444 }
1445 /*
1446 * Setup the fabric API of function pointers used by target_core_mod
1447 */
1448 fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name;
1449 fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident;
1450 fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn;
1451 fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag;
1452 fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth;
1453 fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id;
1454 fabric->tf_ops.tpg_get_pr_transport_id_len =
1455 &tcm_loop_get_pr_transport_id_len;
1456 fabric->tf_ops.tpg_parse_pr_out_transport_id =
1457 &tcm_loop_parse_pr_out_transport_id;
1458 fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode;
1459 fabric->tf_ops.tpg_check_demo_mode_cache =
1460 &tcm_loop_check_demo_mode_cache;
1461 fabric->tf_ops.tpg_check_demo_mode_write_protect =
1462 &tcm_loop_check_demo_mode_write_protect;
1463 fabric->tf_ops.tpg_check_prod_mode_write_protect =
1464 &tcm_loop_check_prod_mode_write_protect;
1465 /*
1466 * The TCM loopback fabric module runs in demo-mode to a local
1467 * virtual SCSI device, so fabric dependent initator ACLs are
1468 * not required.
1469 */
1470 fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl;
1471 fabric->tf_ops.tpg_release_fabric_acl =
1472 &tcm_loop_tpg_release_fabric_acl;
1473 fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index;
1474 /*
1475 * Used for setting up remaining TCM resources in process context
1476 */
1477 fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free;
1478 fabric->tf_ops.release_cmd = &tcm_loop_release_cmd;
1479 fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session;
1480 fabric->tf_ops.close_session = &tcm_loop_close_session;
1481 fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index;
1482 fabric->tf_ops.sess_get_initiator_sid = NULL;
1483 fabric->tf_ops.write_pending = &tcm_loop_write_pending;
1484 fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status;
1485 /*
1486 * Not used for TCM loopback
1487 */
1488 fabric->tf_ops.set_default_node_attributes =
1489 &tcm_loop_set_default_node_attributes;
1490 fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag;
1491 fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state;
1492 fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in;
1493 fabric->tf_ops.queue_status = &tcm_loop_queue_status;
1494 fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp;
1495 fabric->tf_ops.aborted_task = &tcm_loop_aborted_task;
1496
1497 /*
1498 * Setup function pointers for generic logic in target_core_fabric_configfs.c
1499 */
1500 fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba;
1501 fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba;
1502 fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg;
1503 fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg;
1504 /*
1505 * fabric_post_link() and fabric_pre_unlink() are used for
1506 * registration and release of TCM Loop Virtual SCSI LUNs.
1507 */
1508 fabric->tf_ops.fabric_post_link = &tcm_loop_port_link;
1509 fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink;
1510 fabric->tf_ops.fabric_make_np = NULL;
1511 fabric->tf_ops.fabric_drop_np = NULL;
1512 /*
1513 * Setup default attribute lists for various fabric->tf_cit_tmpl
1514 */
1515 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs;
1516 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs;
1517 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
1518 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = NULL;
1519 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
1520 /*
1521 * Once fabric->tf_ops has been setup, now register the fabric for
1522 * use within TCM
1523 */
1524 ret = target_fabric_configfs_register(fabric);
1525 if (ret < 0) {
1526 pr_err("target_fabric_configfs_register() for"
1527 " TCM_Loop failed!\n");
1528 target_fabric_configfs_free(fabric);
1529 return -1;
1530 }
1531 /*
1532 * Setup our local pointer to *fabric.
1533 */
1534 tcm_loop_fabric_configfs = fabric;
1535 pr_debug("TCM_LOOP[0] - Set fabric ->"
1536 " tcm_loop_fabric_configfs\n");
1537 return 0;
1538}
1539
1540static void tcm_loop_deregister_configfs(void)
1541{
1542 if (!tcm_loop_fabric_configfs)
1543 return;
1544
1545 target_fabric_configfs_deregister(tcm_loop_fabric_configfs);
1546 tcm_loop_fabric_configfs = NULL;
1547 pr_debug("TCM_LOOP[0] - Cleared"
1548 " tcm_loop_fabric_configfs\n");
1549}
1550
1551static int __init tcm_loop_fabric_init(void)
1552{
1553 int ret = -ENOMEM;
1554
1555 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1556 if (!tcm_loop_workqueue)
1557 goto out;
1558
1559 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1560 sizeof(struct tcm_loop_cmd),
1561 __alignof__(struct tcm_loop_cmd),
1562 0, NULL);
1563 if (!tcm_loop_cmd_cache) {
1564 pr_debug("kmem_cache_create() for"
1565 " tcm_loop_cmd_cache failed\n");
1566 goto out_destroy_workqueue;
1567 }
1568
1569 ret = tcm_loop_alloc_core_bus();
1570 if (ret)
1571 goto out_destroy_cache;
1572
1573 ret = tcm_loop_register_configfs();
1574 if (ret)
1575 goto out_release_core_bus;
1576
1577 return 0;
1578
1579out_release_core_bus:
1580 tcm_loop_release_core_bus();
1581out_destroy_cache:
1582 kmem_cache_destroy(tcm_loop_cmd_cache);
1583out_destroy_workqueue:
1584 destroy_workqueue(tcm_loop_workqueue);
1585out:
1586 return ret;
1587}
1588
1589static void __exit tcm_loop_fabric_exit(void)
1590{
1591 tcm_loop_deregister_configfs();
1592 tcm_loop_release_core_bus();
1593 kmem_cache_destroy(tcm_loop_cmd_cache);
1594 destroy_workqueue(tcm_loop_workqueue);
1595}
1596
1597MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1598MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1599MODULE_LICENSE("GPL");
1600module_init(tcm_loop_fabric_init);
1601module_exit(tcm_loop_fabric_exit);