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target: Updates from AGrover and HCH (round 3)
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / loopback / tcm_loop.c
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3703b2c5
NB		 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>
61db1802 34#include <scsi/scsi_tcq.h>
3703b2c5
NB		 35
36#include <target/target_core_base.h>
37#include <target/target_core_transport.h>
38#include <target/target_core_fabric_ops.h>
39#include <target/target_core_fabric_configfs.h>
40#include <target/target_core_fabric_lib.h>
41#include <target/target_core_configfs.h>
42#include <target/target_core_device.h>
43#include <target/target_core_tpg.h>
44#include <target/target_core_tmr.h>
45
46#include "tcm_loop.h"
47
48#define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev)
49
50/* Local pointer to allocated TCM configfs fabric module */
51static struct target_fabric_configfs *tcm_loop_fabric_configfs;
52
53static struct kmem_cache *tcm_loop_cmd_cache;
54
55static int tcm_loop_hba_no_cnt;
56
57/*
58 * Allocate a tcm_loop cmd descriptor from target_core_mod code
59 *
60 * Can be called from interrupt context in tcm_loop_queuecommand() below
61 */
62static struct se_cmd *tcm_loop_allocate_core_cmd(
63 struct tcm_loop_hba *tl_hba,
64 struct se_portal_group *se_tpg,
65 struct scsi_cmnd *sc)
66{
67 struct se_cmd *se_cmd;
68 struct se_session *se_sess;
69 struct tcm_loop_nexus *tl_nexus = tl_hba->tl_nexus;
70 struct tcm_loop_cmd *tl_cmd;
71 int sam_task_attr;
72
73 if (!tl_nexus) {
74 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
75 " does not exist\n");
76 set_host_byte(sc, DID_ERROR);
77 return NULL;
78 }
79 se_sess = tl_nexus->se_sess;
80
81 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
82 if (!tl_cmd) {
83 printk(KERN_ERR "Unable to allocate struct tcm_loop_cmd\n");
84 set_host_byte(sc, DID_ERROR);
85 return NULL;
86 }
87 se_cmd = &tl_cmd->tl_se_cmd;
88 /*
89 * Save the pointer to struct scsi_cmnd *sc
90 */
91 tl_cmd->sc = sc;
92 /*
93 * Locate the SAM Task Attr from struct scsi_cmnd *
94 */
95 if (sc->device->tagged_supported) {
96 switch (sc->tag) {
97 case HEAD_OF_QUEUE_TAG:
61db1802 98 sam_task_attr = MSG_HEAD_TAG;
3703b2c5
NB		 99 break;
100 case ORDERED_QUEUE_TAG:
61db1802 101 sam_task_attr = MSG_ORDERED_TAG;
3703b2c5
NB		 102 break;
103 default:
61db1802 104 sam_task_attr = MSG_SIMPLE_TAG;
3703b2c5
NB		 105 break;
106 }
107 } else
61db1802 108 sam_task_attr = MSG_SIMPLE_TAG;
3703b2c5
NB		 109
110 /*
111 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
112 */
113 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
114 scsi_bufflen(sc), sc->sc_data_direction, sam_task_attr,
115 &tl_cmd->tl_sense_buf[0]);
116
117 /*
118 * Signal BIDI usage with T_TASK(cmd)->t_tasks_bidi
119 */
120 if (scsi_bidi_cmnd(sc))
a1d8b49a 121 se_cmd->t_tasks_bidi = 1;
3703b2c5
NB		 122 /*
123 * Locate the struct se_lun pointer and attach it to struct se_cmd
124 */
5951146d 125 if (transport_lookup_cmd_lun(se_cmd, tl_cmd->sc->device->lun) < 0) {
3703b2c5
NB		 126 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
127 set_host_byte(sc, DID_NO_CONNECT);
128 return NULL;
129 }
130
3703b2c5
NB		 131 return se_cmd;
132}
133
134/*
135 * Called by struct target_core_fabric_ops->new_cmd_map()
136 *
137 * Always called in process context. A non zero return value
138 * here will signal to handle an exception based on the return code.
139 */
140static int tcm_loop_new_cmd_map(struct se_cmd *se_cmd)
141{
142 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
143 struct tcm_loop_cmd, tl_se_cmd);
144 struct scsi_cmnd *sc = tl_cmd->sc;
5951146d
AG		 145 struct scatterlist *sgl_bidi = NULL;
146 u32 sgl_bidi_count = 0;
3703b2c5
NB		 147 int ret;
148 /*
149 * Allocate the necessary tasks to complete the received CDB+data
150 */
5951146d
AG		 151 ret = transport_generic_allocate_tasks(se_cmd, sc->cmnd);
152 if (ret == -ENOMEM) {
3703b2c5
NB		 153 /* Out of Resources */
154 return PYX_TRANSPORT_LU_COMM_FAILURE;
5951146d 155 } else if (ret == -EINVAL) {
3703b2c5
NB		 156 /*
157 * Handle case for SAM_STAT_RESERVATION_CONFLICT
158 */
159 if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT)
160 return PYX_TRANSPORT_RESERVATION_CONFLICT;
161 /*
162 * Otherwise, return SAM_STAT_CHECK_CONDITION and return
163 * sense data.
164 */
165 return PYX_TRANSPORT_USE_SENSE_REASON;
166 }
5951146d 167
3703b2c5 168 /*
5951146d
AG		 169 * For BIDI commands, pass in the extra READ buffer
170 * to transport_generic_map_mem_to_cmd() below..
3703b2c5 171 */
a1d8b49a 172 if (se_cmd->t_tasks_bidi) {
5951146d 173 struct scsi_data_buffer *sdb = scsi_in(sc);
3703b2c5 174
5951146d
AG		 175 sgl_bidi = sdb->table.sgl;
176 sgl_bidi_count = sdb->table.nents;
3703b2c5 177 }
5951146d 178
3703b2c5
NB		 179 /*
180 * Map the SG memory into struct se_mem->page linked list using the same
181 * physical memory at sg->page_link.
182 */
5951146d
AG		 183 ret = transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc),
184 scsi_sg_count(sc), sgl_bidi, sgl_bidi_count);
3703b2c5
NB		 185 if (ret < 0)
186 return PYX_TRANSPORT_LU_COMM_FAILURE;
187
188 return 0;
189}
190
191/*
192 * Called from struct target_core_fabric_ops->check_stop_free()
193 */
194static void tcm_loop_check_stop_free(struct se_cmd *se_cmd)
195{
196 /*
197 * Do not release struct se_cmd's containing a valid TMR
198 * pointer. These will be released directly in tcm_loop_device_reset()
199 * with transport_generic_free_cmd().
200 */
201 if (se_cmd->se_tmr_req)
202 return;
203 /*
204 * Release the struct se_cmd, which will make a callback to release
205 * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
206 */
207 transport_generic_free_cmd(se_cmd, 0, 1, 0);
208}
209
210/*
211 * Called from struct target_core_fabric_ops->release_cmd_to_pool()
212 */
213static void tcm_loop_deallocate_core_cmd(struct se_cmd *se_cmd)
214{
215 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
216 struct tcm_loop_cmd, tl_se_cmd);
217
218 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
219}
220
221static int tcm_loop_proc_info(struct Scsi_Host *host, char *buffer,
222 char **start, off_t offset,
223 int length, int inout)
224{
225 return sprintf(buffer, "tcm_loop_proc_info()\n");
226}
227
228static int tcm_loop_driver_probe(struct device *);
229static int tcm_loop_driver_remove(struct device *);
230
231static int pseudo_lld_bus_match(struct device *dev,
232 struct device_driver *dev_driver)
233{
234 return 1;
235}
236
237static struct bus_type tcm_loop_lld_bus = {
238 .name = "tcm_loop_bus",
239 .match = pseudo_lld_bus_match,
240 .probe = tcm_loop_driver_probe,
241 .remove = tcm_loop_driver_remove,
242};
243
244static struct device_driver tcm_loop_driverfs = {
245 .name = "tcm_loop",
246 .bus = &tcm_loop_lld_bus,
247};
248/*
249 * Used with root_device_register() in tcm_loop_alloc_core_bus() below
250 */
251struct device *tcm_loop_primary;
252
253/*
254 * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and
255 * drivers/scsi/libiscsi.c:iscsi_change_queue_depth()
256 */
257static int tcm_loop_change_queue_depth(
258 struct scsi_device *sdev,
259 int depth,
260 int reason)
261{
262 switch (reason) {
263 case SCSI_QDEPTH_DEFAULT:
264 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
265 break;
266 case SCSI_QDEPTH_QFULL:
267 scsi_track_queue_full(sdev, depth);
268 break;
269 case SCSI_QDEPTH_RAMP_UP:
270 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
271 break;
272 default:
273 return -EOPNOTSUPP;
274 }
275 return sdev->queue_depth;
276}
277
278/*
279 * Main entry point from struct scsi_host_template for incoming SCSI CDB+Data
280 * from Linux/SCSI subsystem for SCSI low level device drivers (LLDs)
281 */
282static int tcm_loop_queuecommand(
283 struct Scsi_Host *sh,
284 struct scsi_cmnd *sc)
285{
286 struct se_cmd *se_cmd;
287 struct se_portal_group *se_tpg;
288 struct tcm_loop_hba *tl_hba;
289 struct tcm_loop_tpg *tl_tpg;
290
291 TL_CDB_DEBUG("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x"
292 " scsi_buf_len: %u\n", sc->device->host->host_no,
293 sc->device->id, sc->device->channel, sc->device->lun,
294 sc->cmnd[0], scsi_bufflen(sc));
295 /*
296 * Locate the tcm_loop_hba_t pointer
297 */
298 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
299 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
300 se_tpg = &tl_tpg->tl_se_tpg;
301 /*
302 * Determine the SAM Task Attribute and allocate tl_cmd and
303 * tl_cmd->tl_se_cmd from TCM infrastructure
304 */
305 se_cmd = tcm_loop_allocate_core_cmd(tl_hba, se_tpg, sc);
306 if (!se_cmd) {
307 sc->scsi_done(sc);
308 return 0;
309 }
310 /*
311 * Queue up the newly allocated to be processed in TCM thread context.
312 */
313 transport_generic_handle_cdb_map(se_cmd);
314 return 0;
315}
316
317/*
318 * Called from SCSI EH process context to issue a LUN_RESET TMR
319 * to struct scsi_device
320 */
321static int tcm_loop_device_reset(struct scsi_cmnd *sc)
322{
323 struct se_cmd *se_cmd = NULL;
324 struct se_portal_group *se_tpg;
325 struct se_session *se_sess;
326 struct tcm_loop_cmd *tl_cmd = NULL;
327 struct tcm_loop_hba *tl_hba;
328 struct tcm_loop_nexus *tl_nexus;
329 struct tcm_loop_tmr *tl_tmr = NULL;
330 struct tcm_loop_tpg *tl_tpg;
331 int ret = FAILED;
332 /*
333 * Locate the tcm_loop_hba_t pointer
334 */
335 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
336 /*
337 * Locate the tl_nexus and se_sess pointers
338 */
339 tl_nexus = tl_hba->tl_nexus;
340 if (!tl_nexus) {
341 printk(KERN_ERR "Unable to perform device reset without"
342 " active I_T Nexus\n");
343 return FAILED;
344 }
345 se_sess = tl_nexus->se_sess;
346 /*
347 * Locate the tl_tpg and se_tpg pointers from TargetID in sc->device->id
348 */
349 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
350 se_tpg = &tl_tpg->tl_se_tpg;
351
352 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
353 if (!tl_cmd) {
354 printk(KERN_ERR "Unable to allocate memory for tl_cmd\n");
355 return FAILED;
356 }
357
358 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
359 if (!tl_tmr) {
360 printk(KERN_ERR "Unable to allocate memory for tl_tmr\n");
361 goto release;
362 }
363 init_waitqueue_head(&tl_tmr->tl_tmr_wait);
364
365 se_cmd = &tl_cmd->tl_se_cmd;
366 /*
367 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
368 */
369 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
61db1802 370 DMA_NONE, MSG_SIMPLE_TAG,
3703b2c5
NB		 371 &tl_cmd->tl_sense_buf[0]);
372 /*
373 * Allocate the LUN_RESET TMR
374 */
5951146d 375 se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd, tl_tmr,
3703b2c5 376 TMR_LUN_RESET);
552523dc 377 if (IS_ERR(se_cmd->se_tmr_req))
3703b2c5
NB		 378 goto release;
379 /*
380 * Locate the underlying TCM struct se_lun from sc->device->lun
381 */
5951146d 382 if (transport_lookup_tmr_lun(se_cmd, sc->device->lun) < 0)
3703b2c5
NB		 383 goto release;
384 /*
385 * Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp()
386 * to wake us up.
387 */
388 transport_generic_handle_tmr(se_cmd);
389 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
390 /*
391 * The TMR LUN_RESET has completed, check the response status and
392 * then release allocations.
393 */
394 ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
395 SUCCESS : FAILED;
396release:
397 if (se_cmd)
398 transport_generic_free_cmd(se_cmd, 1, 1, 0);
399 else
400 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
401 kfree(tl_tmr);
402 return ret;
403}
404
405static int tcm_loop_slave_alloc(struct scsi_device *sd)
406{
407 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
408 return 0;
409}
410
411static int tcm_loop_slave_configure(struct scsi_device *sd)
412{
413 return 0;
414}
415
416static struct scsi_host_template tcm_loop_driver_template = {
417 .proc_info = tcm_loop_proc_info,
418 .proc_name = "tcm_loopback",
419 .name = "TCM_Loopback",
420 .queuecommand = tcm_loop_queuecommand,
421 .change_queue_depth = tcm_loop_change_queue_depth,
422 .eh_device_reset_handler = tcm_loop_device_reset,
423 .can_queue = TL_SCSI_CAN_QUEUE,
424 .this_id = -1,
425 .sg_tablesize = TL_SCSI_SG_TABLESIZE,
426 .cmd_per_lun = TL_SCSI_CMD_PER_LUN,
427 .max_sectors = TL_SCSI_MAX_SECTORS,
428 .use_clustering = DISABLE_CLUSTERING,
429 .slave_alloc = tcm_loop_slave_alloc,
430 .slave_configure = tcm_loop_slave_configure,
431 .module = THIS_MODULE,
432};
433
434static int tcm_loop_driver_probe(struct device *dev)
435{
436 struct tcm_loop_hba *tl_hba;
437 struct Scsi_Host *sh;
438 int error;
439
440 tl_hba = to_tcm_loop_hba(dev);
441
442 sh = scsi_host_alloc(&tcm_loop_driver_template,
443 sizeof(struct tcm_loop_hba));
444 if (!sh) {
445 printk(KERN_ERR "Unable to allocate struct scsi_host\n");
446 return -ENODEV;
447 }
448 tl_hba->sh = sh;
449
450 /*
451 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
452 */
453 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
454 /*
455 * Setup single ID, Channel and LUN for now..
456 */
457 sh->max_id = 2;
458 sh->max_lun = 0;
459 sh->max_channel = 0;
460 sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN;
461
462 error = scsi_add_host(sh, &tl_hba->dev);
463 if (error) {
464 printk(KERN_ERR "%s: scsi_add_host failed\n", __func__);
465 scsi_host_put(sh);
466 return -ENODEV;
467 }
468 return 0;
469}
470
471static int tcm_loop_driver_remove(struct device *dev)
472{
473 struct tcm_loop_hba *tl_hba;
474 struct Scsi_Host *sh;
475
476 tl_hba = to_tcm_loop_hba(dev);
477 sh = tl_hba->sh;
478
479 scsi_remove_host(sh);
480 scsi_host_put(sh);
481 return 0;
482}
483
484static void tcm_loop_release_adapter(struct device *dev)
485{
486 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
487
488 kfree(tl_hba);
489}
490
491/*
492 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
493 */
494static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
495{
496 int ret;
497
498 tl_hba->dev.bus = &tcm_loop_lld_bus;
499 tl_hba->dev.parent = tcm_loop_primary;
500 tl_hba->dev.release = &tcm_loop_release_adapter;
501 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
502
503 ret = device_register(&tl_hba->dev);
504 if (ret) {
505 printk(KERN_ERR "device_register() failed for"
506 " tl_hba->dev: %d\n", ret);
507 return -ENODEV;
508 }
509
510 return 0;
511}
512
513/*
514 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
515 * tcm_loop SCSI bus.
516 */
517static int tcm_loop_alloc_core_bus(void)
518{
519 int ret;
520
521 tcm_loop_primary = root_device_register("tcm_loop_0");
522 if (IS_ERR(tcm_loop_primary)) {
523 printk(KERN_ERR "Unable to allocate tcm_loop_primary\n");
524 return PTR_ERR(tcm_loop_primary);
525 }
526
527 ret = bus_register(&tcm_loop_lld_bus);
528 if (ret) {
529 printk(KERN_ERR "bus_register() failed for tcm_loop_lld_bus\n");
530 goto dev_unreg;
531 }
532
533 ret = driver_register(&tcm_loop_driverfs);
534 if (ret) {
535 printk(KERN_ERR "driver_register() failed for"
536 "tcm_loop_driverfs\n");
537 goto bus_unreg;
538 }
539
540 printk(KERN_INFO "Initialized TCM Loop Core Bus\n");
541 return ret;
542
543bus_unreg:
544 bus_unregister(&tcm_loop_lld_bus);
545dev_unreg:
546 root_device_unregister(tcm_loop_primary);
547 return ret;
548}
549
550static void tcm_loop_release_core_bus(void)
551{
552 driver_unregister(&tcm_loop_driverfs);
553 bus_unregister(&tcm_loop_lld_bus);
554 root_device_unregister(tcm_loop_primary);
555
556 printk(KERN_INFO "Releasing TCM Loop Core BUS\n");
557}
558
559static char *tcm_loop_get_fabric_name(void)
560{
561 return "loopback";
562}
563
564static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg)
565{
566 struct tcm_loop_tpg *tl_tpg =
567 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
568 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
569 /*
570 * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba()
571 * time based on the protocol dependent prefix of the passed configfs group.
572 *
573 * Based upon tl_proto_id, TCM_Loop emulates the requested fabric
574 * ProtocolID using target_core_fabric_lib.c symbols.
575 */
576 switch (tl_hba->tl_proto_id) {
577 case SCSI_PROTOCOL_SAS:
578 return sas_get_fabric_proto_ident(se_tpg);
579 case SCSI_PROTOCOL_FCP:
580 return fc_get_fabric_proto_ident(se_tpg);
581 case SCSI_PROTOCOL_ISCSI:
582 return iscsi_get_fabric_proto_ident(se_tpg);
583 default:
584 printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using"
585 " SAS emulation\n", tl_hba->tl_proto_id);
586 break;
587 }
588
589 return sas_get_fabric_proto_ident(se_tpg);
590}
591
592static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
593{
594 struct tcm_loop_tpg *tl_tpg =
595 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
596 /*
597 * Return the passed NAA identifier for the SAS Target Port
598 */
599 return &tl_tpg->tl_hba->tl_wwn_address[0];
600}
601
602static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
603{
604 struct tcm_loop_tpg *tl_tpg =
605 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
606 /*
607 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
608 * to represent the SCSI Target Port.
609 */
610 return tl_tpg->tl_tpgt;
611}
612
613static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg)
614{
615 return 1;
616}
617
618static u32 tcm_loop_get_pr_transport_id(
619 struct se_portal_group *se_tpg,
620 struct se_node_acl *se_nacl,
621 struct t10_pr_registration *pr_reg,
622 int *format_code,
623 unsigned char *buf)
624{
625 struct tcm_loop_tpg *tl_tpg =
626 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
627 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
628
629 switch (tl_hba->tl_proto_id) {
630 case SCSI_PROTOCOL_SAS:
631 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
632 format_code, buf);
633 case SCSI_PROTOCOL_FCP:
634 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
635 format_code, buf);
636 case SCSI_PROTOCOL_ISCSI:
637 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
638 format_code, buf);
639 default:
640 printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using"
641 " SAS emulation\n", tl_hba->tl_proto_id);
642 break;
643 }
644
645 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
646 format_code, buf);
647}
648
649static u32 tcm_loop_get_pr_transport_id_len(
650 struct se_portal_group *se_tpg,
651 struct se_node_acl *se_nacl,
652 struct t10_pr_registration *pr_reg,
653 int *format_code)
654{
655 struct tcm_loop_tpg *tl_tpg =
656 (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr;
657 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
658
659 switch (tl_hba->tl_proto_id) {
660 case SCSI_PROTOCOL_SAS:
661 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
662 format_code);
663 case SCSI_PROTOCOL_FCP:
664 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
665 format_code);
666 case SCSI_PROTOCOL_ISCSI:
667 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
668 format_code);
669 default:
670 printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using"
671 " SAS emulation\n", tl_hba->tl_proto_id);
672 break;
673 }
674
675 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
676 format_code);
677}
678
679/*
680 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
681 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
682 */
683static char *tcm_loop_parse_pr_out_transport_id(
684 struct se_portal_group *se_tpg,
685 const char *buf,
686 u32 *out_tid_len,
687 char **port_nexus_ptr)
688{
689 struct tcm_loop_tpg *tl_tpg =
690 (struct tcm_loop_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_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
696 port_nexus_ptr);
697 case SCSI_PROTOCOL_FCP:
698 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
699 port_nexus_ptr);
700 case SCSI_PROTOCOL_ISCSI:
701 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
702 port_nexus_ptr);
703 default:
704 printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using"
705 " SAS emulation\n", tl_hba->tl_proto_id);
706 break;
707 }
708
709 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
710 port_nexus_ptr);
711}
712
713/*
714 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
715 * based upon the incoming fabric dependent SCSI Initiator Port
716 */
717static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
718{
719 return 1;
720}
721
722static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
723{
724 return 0;
725}
726
727/*
728 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
729 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
730 */
731static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
732{
733 return 0;
734}
735
736/*
737 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
738 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
739 * It has been added here as a nop for target_fabric_tf_ops_check()
740 */
741static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
742{
743 return 0;
744}
745
746static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl(
747 struct se_portal_group *se_tpg)
748{
749 struct tcm_loop_nacl *tl_nacl;
750
751 tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL);
752 if (!tl_nacl) {
753 printk(KERN_ERR "Unable to allocate struct tcm_loop_nacl\n");
754 return NULL;
755 }
756
757 return &tl_nacl->se_node_acl;
758}
759
760static void tcm_loop_tpg_release_fabric_acl(
761 struct se_portal_group *se_tpg,
762 struct se_node_acl *se_nacl)
763{
764 struct tcm_loop_nacl *tl_nacl = container_of(se_nacl,
765 struct tcm_loop_nacl, se_node_acl);
766
767 kfree(tl_nacl);
768}
769
770static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
771{
772 return 1;
773}
774
775static void tcm_loop_new_cmd_failure(struct se_cmd *se_cmd)
776{
777 /*
778 * Since TCM_loop is already passing struct scatterlist data from
779 * struct scsi_cmnd, no more Linux/SCSI failure dependent state need
780 * to be handled here.
781 */
782 return;
783}
784
785static int tcm_loop_is_state_remove(struct se_cmd *se_cmd)
786{
787 /*
788 * Assume struct scsi_cmnd is not in remove state..
789 */
790 return 0;
791}
792
793static int tcm_loop_sess_logged_in(struct se_session *se_sess)
794{
795 /*
796 * Assume that TL Nexus is always active
797 */
798 return 1;
799}
800
801static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
802{
803 return 1;
804}
805
806static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
807{
808 return;
809}
810
811static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd)
812{
813 return 1;
814}
815
816static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
817{
818 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
819 struct tcm_loop_cmd, tl_se_cmd);
820
821 return tl_cmd->sc_cmd_state;
822}
823
824static int tcm_loop_shutdown_session(struct se_session *se_sess)
825{
826 return 0;
827}
828
829static void tcm_loop_close_session(struct se_session *se_sess)
830{
831 return;
832};
833
834static void tcm_loop_stop_session(
835 struct se_session *se_sess,
836 int sess_sleep,
837 int conn_sleep)
838{
839 return;
840}
841
842static void tcm_loop_fall_back_to_erl0(struct se_session *se_sess)
843{
844 return;
845}
846
847static int tcm_loop_write_pending(struct se_cmd *se_cmd)
848{
849 /*
850 * Since Linux/SCSI has already sent down a struct scsi_cmnd
851 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
852 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
853 * format with transport_generic_map_mem_to_cmd().
854 *
855 * We now tell TCM to add this WRITE CDB directly into the TCM storage
856 * object execution queue.
857 */
858 transport_generic_process_write(se_cmd);
859 return 0;
860}
861
862static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
863{
864 return 0;
865}
866
867static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
868{
869 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
870 struct tcm_loop_cmd, tl_se_cmd);
871 struct scsi_cmnd *sc = tl_cmd->sc;
872
873 TL_CDB_DEBUG("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
874 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
875
876 sc->result = SAM_STAT_GOOD;
877 set_host_byte(sc, DID_OK);
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 TL_CDB_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
5951146d 895 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
3703b2c5
NB		 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 sc->scsi_done(sc);
904 return 0;
905}
906
907static int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
908{
909 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
910 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
911 /*
912 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
913 * and wake up the wait_queue_head_t in tcm_loop_device_reset()
914 */
915 atomic_set(&tl_tmr->tmr_complete, 1);
916 wake_up(&tl_tmr->tl_tmr_wait);
917 return 0;
918}
919
920static u16 tcm_loop_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length)
921{
922 return 0;
923}
924
925static u16 tcm_loop_get_fabric_sense_len(void)
926{
927 return 0;
928}
929
3703b2c5
NB		 930static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
931{
932 switch (tl_hba->tl_proto_id) {
933 case SCSI_PROTOCOL_SAS:
934 return "SAS";
935 case SCSI_PROTOCOL_FCP:
936 return "FCP";
937 case SCSI_PROTOCOL_ISCSI:
938 return "iSCSI";
939 default:
940 break;
941 }
942
943 return "Unknown";
944}
945
946/* Start items for tcm_loop_port_cit */
947
948static int tcm_loop_port_link(
949 struct se_portal_group *se_tpg,
950 struct se_lun *lun)
951{
952 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
953 struct tcm_loop_tpg, tl_se_tpg);
954 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
955
956 atomic_inc(&tl_tpg->tl_tpg_port_count);
957 smp_mb__after_atomic_inc();
958 /*
959 * Add Linux/SCSI struct scsi_device by HCTL
960 */
961 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
962
963 printk(KERN_INFO "TCM_Loop_ConfigFS: Port Link Successful\n");
964 return 0;
965}
966
967static void tcm_loop_port_unlink(
968 struct se_portal_group *se_tpg,
969 struct se_lun *se_lun)
970{
971 struct scsi_device *sd;
972 struct tcm_loop_hba *tl_hba;
973 struct tcm_loop_tpg *tl_tpg;
974
975 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
976 tl_hba = tl_tpg->tl_hba;
977
978 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
979 se_lun->unpacked_lun);
980 if (!sd) {
981 printk(KERN_ERR "Unable to locate struct scsi_device for %d:%d:"
982 "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
983 return;
984 }
985 /*
986 * Remove Linux/SCSI struct scsi_device by HCTL
987 */
988 scsi_remove_device(sd);
989 scsi_device_put(sd);
990
991 atomic_dec(&tl_tpg->tl_tpg_port_count);
992 smp_mb__after_atomic_dec();
993
994 printk(KERN_INFO "TCM_Loop_ConfigFS: Port Unlink Successful\n");
995}
996
997/* End items for tcm_loop_port_cit */
998
999/* Start items for tcm_loop_nexus_cit */
1000
1001static int tcm_loop_make_nexus(
1002 struct tcm_loop_tpg *tl_tpg,
1003 const char *name)
1004{
1005 struct se_portal_group *se_tpg;
1006 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1007 struct tcm_loop_nexus *tl_nexus;
552523dc 1008 int ret = -ENOMEM;
3703b2c5
NB		 1009
1010 if (tl_tpg->tl_hba->tl_nexus) {
1011 printk(KERN_INFO "tl_tpg->tl_hba->tl_nexus already exists\n");
1012 return -EEXIST;
1013 }
1014 se_tpg = &tl_tpg->tl_se_tpg;
1015
1016 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
1017 if (!tl_nexus) {
1018 printk(KERN_ERR "Unable to allocate struct tcm_loop_nexus\n");
1019 return -ENOMEM;
1020 }
1021 /*
1022 * Initialize the struct se_session pointer
1023 */
1024 tl_nexus->se_sess = transport_init_session();
552523dc
DC		 1025 if (IS_ERR(tl_nexus->se_sess)) {
1026 ret = PTR_ERR(tl_nexus->se_sess);
3703b2c5 1027 goto out;
552523dc 1028 }
3703b2c5
NB		 1029 /*
1030 * Since we are running in 'demo mode' this call with generate a
1031 * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI
1032 * Initiator port name of the passed configfs group 'name'.
1033 */
1034 tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1035 se_tpg, (unsigned char *)name);
1036 if (!tl_nexus->se_sess->se_node_acl) {
1037 transport_free_session(tl_nexus->se_sess);
1038 goto out;
1039 }
1040 /*
1041 * Now, register the SAS I_T Nexus as active with the call to
1042 * transport_register_session()
1043 */
1044 __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl,
5951146d 1045 tl_nexus->se_sess, tl_nexus);
3703b2c5
NB		 1046 tl_tpg->tl_hba->tl_nexus = tl_nexus;
1047 printk(KERN_INFO "TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
1048 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
1049 name);
1050 return 0;
1051
1052out:
1053 kfree(tl_nexus);
552523dc 1054 return ret;
3703b2c5
NB		 1055}
1056
1057static int tcm_loop_drop_nexus(
1058 struct tcm_loop_tpg *tpg)
1059{
1060 struct se_session *se_sess;
1061 struct tcm_loop_nexus *tl_nexus;
1062 struct tcm_loop_hba *tl_hba = tpg->tl_hba;
1063
1064 tl_nexus = tpg->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 printk(KERN_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 printk(KERN_INFO "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 */
60d645a4 1134 if (strlen(page) >= TL_WWN_ADDR_LEN) {
3703b2c5
NB		 1135 printk(KERN_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 printk(KERN_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 printk(KERN_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 printk(KERN_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 printk(KERN_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 struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1194 &tcm_loop_tpg_nexus.attr,
1195 NULL,
1196};
1197
1198/* Start items for tcm_loop_naa_cit */
1199
1200struct se_portal_group *tcm_loop_make_naa_tpg(
1201 struct se_wwn *wwn,
1202 struct config_group *group,
1203 const char *name)
1204{
1205 struct tcm_loop_hba *tl_hba = container_of(wwn,
1206 struct tcm_loop_hba, tl_hba_wwn);
1207 struct tcm_loop_tpg *tl_tpg;
1208 char *tpgt_str, *end_ptr;
1209 int ret;
1210 unsigned short int tpgt;
1211
1212 tpgt_str = strstr(name, "tpgt_");
1213 if (!tpgt_str) {
1214 printk(KERN_ERR "Unable to locate \"tpgt_#\" directory"
1215 " group\n");
1216 return ERR_PTR(-EINVAL);
1217 }
1218 tpgt_str += 5; /* Skip ahead of "tpgt_" */
1219 tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0);
1220
1221 if (tpgt > TL_TPGS_PER_HBA) {
1222 printk(KERN_ERR "Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
1223 " %u\n", tpgt, TL_TPGS_PER_HBA);
1224 return ERR_PTR(-EINVAL);
1225 }
1226 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1227 tl_tpg->tl_hba = tl_hba;
1228 tl_tpg->tl_tpgt = tpgt;
1229 /*
1230 * Register the tl_tpg as a emulated SAS TCM Target Endpoint
1231 */
1232 ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops,
5951146d 1233 wwn, &tl_tpg->tl_se_tpg, tl_tpg,
3703b2c5
NB		 1234 TRANSPORT_TPG_TYPE_NORMAL);
1235 if (ret < 0)
1236 return ERR_PTR(-ENOMEM);
1237
1238 printk(KERN_INFO "TCM_Loop_ConfigFS: Allocated Emulated %s"
1239 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1240 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1241
1242 return &tl_tpg->tl_se_tpg;
1243}
1244
1245void tcm_loop_drop_naa_tpg(
1246 struct se_portal_group *se_tpg)
1247{
1248 struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1249 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1250 struct tcm_loop_tpg, tl_se_tpg);
1251 struct tcm_loop_hba *tl_hba;
1252 unsigned short tpgt;
1253
1254 tl_hba = tl_tpg->tl_hba;
1255 tpgt = tl_tpg->tl_tpgt;
1256 /*
1257 * Release the I_T Nexus for the Virtual SAS link if present
1258 */
1259 tcm_loop_drop_nexus(tl_tpg);
1260 /*
1261 * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint
1262 */
1263 core_tpg_deregister(se_tpg);
1264
1265 printk(KERN_INFO "TCM_Loop_ConfigFS: Deallocated Emulated %s"
1266 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1267 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1268}
1269
1270/* End items for tcm_loop_naa_cit */
1271
1272/* Start items for tcm_loop_cit */
1273
1274struct se_wwn *tcm_loop_make_scsi_hba(
1275 struct target_fabric_configfs *tf,
1276 struct config_group *group,
1277 const char *name)
1278{
1279 struct tcm_loop_hba *tl_hba;
1280 struct Scsi_Host *sh;
1281 char *ptr;
1282 int ret, off = 0;
1283
1284 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1285 if (!tl_hba) {
1286 printk(KERN_ERR "Unable to allocate struct tcm_loop_hba\n");
1287 return ERR_PTR(-ENOMEM);
1288 }
1289 /*
1290 * Determine the emulated Protocol Identifier and Target Port Name
1291 * based on the incoming configfs directory name.
1292 */
1293 ptr = strstr(name, "naa.");
1294 if (ptr) {
1295 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1296 goto check_len;
1297 }
1298 ptr = strstr(name, "fc.");
1299 if (ptr) {
1300 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1301 off = 3; /* Skip over "fc." */
1302 goto check_len;
1303 }
1304 ptr = strstr(name, "iqn.");
1305 if (ptr) {
1306 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1307 goto check_len;
1308 }
1309
1310 printk(KERN_ERR "Unable to locate prefix for emulated Target Port:"
1311 " %s\n", name);
1312 return ERR_PTR(-EINVAL);
1313
1314check_len:
60d645a4 1315 if (strlen(name) >= TL_WWN_ADDR_LEN) {
3703b2c5
NB		 1316 printk(KERN_ERR "Emulated NAA %s Address: %s, exceeds"
1317 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1318 TL_WWN_ADDR_LEN);
1319 kfree(tl_hba);
1320 return ERR_PTR(-EINVAL);
1321 }
1322 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1323
1324 /*
1325 * Call device_register(tl_hba->dev) to register the emulated
1326 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1327 * device_register() callbacks in tcm_loop_driver_probe()
1328 */
1329 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1330 if (ret)
1331 goto out;
1332
1333 sh = tl_hba->sh;
1334 tcm_loop_hba_no_cnt++;
1335 printk(KERN_INFO "TCM_Loop_ConfigFS: Allocated emulated Target"
1336 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1337 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1338
1339 return &tl_hba->tl_hba_wwn;
1340out:
1341 kfree(tl_hba);
1342 return ERR_PTR(ret);
1343}
1344
1345void tcm_loop_drop_scsi_hba(
1346 struct se_wwn *wwn)
1347{
1348 struct tcm_loop_hba *tl_hba = container_of(wwn,
1349 struct tcm_loop_hba, tl_hba_wwn);
1350 int host_no = tl_hba->sh->host_no;
1351 /*
1352 * Call device_unregister() on the original tl_hba->dev.
1353 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1354 * release *tl_hba;
1355 */
1356 device_unregister(&tl_hba->dev);
1357
1358 printk(KERN_INFO "TCM_Loop_ConfigFS: Deallocated emulated Target"
1359 " SAS Address: %s at Linux/SCSI Host ID: %d\n",
1360 config_item_name(&wwn->wwn_group.cg_item), host_no);
1361}
1362
1363/* Start items for tcm_loop_cit */
1364static ssize_t tcm_loop_wwn_show_attr_version(
1365 struct target_fabric_configfs *tf,
1366 char *page)
1367{
1368 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1369}
1370
1371TF_WWN_ATTR_RO(tcm_loop, version);
1372
1373static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1374 &tcm_loop_wwn_version.attr,
1375 NULL,
1376};
1377
1378/* End items for tcm_loop_cit */
1379
1380static int tcm_loop_register_configfs(void)
1381{
1382 struct target_fabric_configfs *fabric;
1383 struct config_group *tf_cg;
1384 int ret;
1385 /*
1386 * Set the TCM Loop HBA counter to zero
1387 */
1388 tcm_loop_hba_no_cnt = 0;
1389 /*
1390 * Register the top level struct config_item_type with TCM core
1391 */
1392 fabric = target_fabric_configfs_init(THIS_MODULE, "loopback");
e3d6f909 1393 if (IS_ERR(fabric)) {
3703b2c5 1394 printk(KERN_ERR "tcm_loop_register_configfs() failed!\n");
e3d6f909 1395 return PTR_ERR(fabric);
3703b2c5
NB		 1396 }
1397 /*
1398 * Setup the fabric API of function pointers used by target_core_mod
1399 */
1400 fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name;
1401 fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident;
1402 fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn;
1403 fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag;
1404 fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth;
1405 fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id;
1406 fabric->tf_ops.tpg_get_pr_transport_id_len =
1407 &tcm_loop_get_pr_transport_id_len;
1408 fabric->tf_ops.tpg_parse_pr_out_transport_id =
1409 &tcm_loop_parse_pr_out_transport_id;
1410 fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode;
1411 fabric->tf_ops.tpg_check_demo_mode_cache =
1412 &tcm_loop_check_demo_mode_cache;
1413 fabric->tf_ops.tpg_check_demo_mode_write_protect =
1414 &tcm_loop_check_demo_mode_write_protect;
1415 fabric->tf_ops.tpg_check_prod_mode_write_protect =
1416 &tcm_loop_check_prod_mode_write_protect;
1417 /*
1418 * The TCM loopback fabric module runs in demo-mode to a local
1419 * virtual SCSI device, so fabric dependent initator ACLs are
1420 * not required.
1421 */
1422 fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl;
1423 fabric->tf_ops.tpg_release_fabric_acl =
1424 &tcm_loop_tpg_release_fabric_acl;
1425 fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index;
3703b2c5
NB		 1426 /*
1427 * Used for setting up remaining TCM resources in process context
1428 */
1429 fabric->tf_ops.new_cmd_map = &tcm_loop_new_cmd_map;
1430 fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free;
1431 fabric->tf_ops.release_cmd_to_pool = &tcm_loop_deallocate_core_cmd;
1432 fabric->tf_ops.release_cmd_direct = &tcm_loop_deallocate_core_cmd;
1433 fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session;
1434 fabric->tf_ops.close_session = &tcm_loop_close_session;
1435 fabric->tf_ops.stop_session = &tcm_loop_stop_session;
1436 fabric->tf_ops.fall_back_to_erl0 = &tcm_loop_fall_back_to_erl0;
1437 fabric->tf_ops.sess_logged_in = &tcm_loop_sess_logged_in;
1438 fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index;
1439 fabric->tf_ops.sess_get_initiator_sid = NULL;
1440 fabric->tf_ops.write_pending = &tcm_loop_write_pending;
1441 fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status;
1442 /*
1443 * Not used for TCM loopback
1444 */
1445 fabric->tf_ops.set_default_node_attributes =
1446 &tcm_loop_set_default_node_attributes;
1447 fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag;
1448 fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state;
1449 fabric->tf_ops.new_cmd_failure = &tcm_loop_new_cmd_failure;
1450 fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in;
1451 fabric->tf_ops.queue_status = &tcm_loop_queue_status;
1452 fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp;
1453 fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len;
1454 fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len;
1455 fabric->tf_ops.is_state_remove = &tcm_loop_is_state_remove;
3703b2c5
NB		 1456
1457 tf_cg = &fabric->tf_group;
1458 /*
1459 * Setup function pointers for generic logic in target_core_fabric_configfs.c
1460 */
1461 fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba;
1462 fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba;
1463 fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg;
1464 fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg;
1465 /*
1466 * fabric_post_link() and fabric_pre_unlink() are used for
1467 * registration and release of TCM Loop Virtual SCSI LUNs.
1468 */
1469 fabric->tf_ops.fabric_post_link = &tcm_loop_port_link;
1470 fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink;
1471 fabric->tf_ops.fabric_make_np = NULL;
1472 fabric->tf_ops.fabric_drop_np = NULL;
1473 /*
1474 * Setup default attribute lists for various fabric->tf_cit_tmpl
1475 */
1476 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs;
1477 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs;
1478 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
1479 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
1480 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
1481 /*
1482 * Once fabric->tf_ops has been setup, now register the fabric for
1483 * use within TCM
1484 */
1485 ret = target_fabric_configfs_register(fabric);
1486 if (ret < 0) {
1487 printk(KERN_ERR "target_fabric_configfs_register() for"
1488 " TCM_Loop failed!\n");
1489 target_fabric_configfs_free(fabric);
1490 return -1;
1491 }
1492 /*
1493 * Setup our local pointer to *fabric.
1494 */
1495 tcm_loop_fabric_configfs = fabric;
1496 printk(KERN_INFO "TCM_LOOP[0] - Set fabric ->"
1497 " tcm_loop_fabric_configfs\n");
1498 return 0;
1499}
1500
1501static void tcm_loop_deregister_configfs(void)
1502{
1503 if (!tcm_loop_fabric_configfs)
1504 return;
1505
1506 target_fabric_configfs_deregister(tcm_loop_fabric_configfs);
1507 tcm_loop_fabric_configfs = NULL;
1508 printk(KERN_INFO "TCM_LOOP[0] - Cleared"
1509 " tcm_loop_fabric_configfs\n");
1510}
1511
1512static int __init tcm_loop_fabric_init(void)
1513{
1514 int ret;
1515
1516 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1517 sizeof(struct tcm_loop_cmd),
1518 __alignof__(struct tcm_loop_cmd),
1519 0, NULL);
1520 if (!tcm_loop_cmd_cache) {
1521 printk(KERN_ERR "kmem_cache_create() for"
1522 " tcm_loop_cmd_cache failed\n");
1523 return -ENOMEM;
1524 }
1525
1526 ret = tcm_loop_alloc_core_bus();
1527 if (ret)
1528 return ret;
1529
1530 ret = tcm_loop_register_configfs();
1531 if (ret) {
1532 tcm_loop_release_core_bus();
1533 return ret;
1534 }
1535
1536 return 0;
1537}
1538
1539static void __exit tcm_loop_fabric_exit(void)
1540{
1541 tcm_loop_deregister_configfs();
1542 tcm_loop_release_core_bus();
1543 kmem_cache_destroy(tcm_loop_cmd_cache);
1544}
1545
1546MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1547MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1548MODULE_LICENSE("GPL");
1549module_init(tcm_loop_fabric_init);
1550module_exit(tcm_loop_fabric_exit);
kernel source for telekom puls (alcatel/mediatek)