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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
38#include "tcm_loop.h"
39
40#define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev)
41
42static struct workqueue_struct *tcm_loop_workqueue;
43static struct kmem_cache *tcm_loop_cmd_cache;
44
45static int tcm_loop_hba_no_cnt;
46
47static int tcm_loop_queue_status(struct se_cmd *se_cmd);
48
49/*
50 * Called from struct target_core_fabric_ops->check_stop_free()
51 */
52static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
53{
54 /*
55 * Do not release struct se_cmd's containing a valid TMR
56 * pointer. These will be released directly in tcm_loop_device_reset()
57 * with transport_generic_free_cmd().
58 */
59 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
60 return 0;
61 /*
62 * Release the struct se_cmd, which will make a callback to release
63 * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd()
64 */
65 transport_generic_free_cmd(se_cmd, 0);
66 return 1;
67}
68
69static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
70{
71 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
72 struct tcm_loop_cmd, tl_se_cmd);
73
74 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
75}
76
77static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
78{
79 seq_printf(m, "tcm_loop_proc_info()\n");
80 return 0;
81}
82
83static int tcm_loop_driver_probe(struct device *);
84static int tcm_loop_driver_remove(struct device *);
85
86static int pseudo_lld_bus_match(struct device *dev,
87 struct device_driver *dev_driver)
88{
89 return 1;
90}
91
92static struct bus_type tcm_loop_lld_bus = {
93 .name = "tcm_loop_bus",
94 .match = pseudo_lld_bus_match,
95 .probe = tcm_loop_driver_probe,
96 .remove = tcm_loop_driver_remove,
97};
98
99static struct device_driver tcm_loop_driverfs = {
100 .name = "tcm_loop",
101 .bus = &tcm_loop_lld_bus,
102};
103/*
104 * Used with root_device_register() in tcm_loop_alloc_core_bus() below
105 */
106static struct device *tcm_loop_primary;
107
108static void tcm_loop_submission_work(struct work_struct *work)
109{
110 struct tcm_loop_cmd *tl_cmd =
111 container_of(work, struct tcm_loop_cmd, work);
112 struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
113 struct scsi_cmnd *sc = tl_cmd->sc;
114 struct tcm_loop_nexus *tl_nexus;
115 struct tcm_loop_hba *tl_hba;
116 struct tcm_loop_tpg *tl_tpg;
117 struct scatterlist *sgl_bidi = NULL;
118 u32 sgl_bidi_count = 0, transfer_length;
119 int rc;
120
121 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
122 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
123
124 /*
125 * Ensure that this tl_tpg reference from the incoming sc->device->id
126 * has already been configured via tcm_loop_make_naa_tpg().
127 */
128 if (!tl_tpg->tl_hba) {
129 set_host_byte(sc, DID_NO_CONNECT);
130 goto out_done;
131 }
132 if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
133 set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
134 goto out_done;
135 }
136 tl_nexus = tl_tpg->tl_nexus;
137 if (!tl_nexus) {
138 scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
139 " does not exist\n");
140 set_host_byte(sc, DID_ERROR);
141 goto out_done;
142 }
143 if (scsi_bidi_cmnd(sc)) {
144 struct scsi_data_buffer *sdb = scsi_in(sc);
145
146 sgl_bidi = sdb->table.sgl;
147 sgl_bidi_count = sdb->table.nents;
148 se_cmd->se_cmd_flags |= SCF_BIDI;
149
150 }
151
152 transfer_length = scsi_transfer_length(sc);
153 if (!scsi_prot_sg_count(sc) &&
154 scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
155 se_cmd->prot_pto = true;
156 /*
157 * loopback transport doesn't support
158 * WRITE_GENERATE, READ_STRIP protection
159 * information operations, go ahead unprotected.
160 */
161 transfer_length = scsi_bufflen(sc);
162 }
163
164 se_cmd->tag = tl_cmd->sc_cmd_tag;
165 rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
166 &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
167 transfer_length, TCM_SIMPLE_TAG,
168 sc->sc_data_direction, 0,
169 scsi_sglist(sc), scsi_sg_count(sc),
170 sgl_bidi, sgl_bidi_count,
171 scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
172 if (rc < 0) {
173 set_host_byte(sc, DID_NO_CONNECT);
174 goto out_done;
175 }
176 return;
177
178out_done:
179 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
180 sc->scsi_done(sc);
181 return;
182}
183
184/*
185 * ->queuecommand can be and usually is called from interrupt context, so
186 * defer the actual submission to a workqueue.
187 */
188static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
189{
190 struct tcm_loop_cmd *tl_cmd;
191
192 pr_debug("tcm_loop_queuecommand() %d:%d:%d:%llu got CDB: 0x%02x"
193 " scsi_buf_len: %u\n", sc->device->host->host_no,
194 sc->device->id, sc->device->channel, sc->device->lun,
195 sc->cmnd[0], scsi_bufflen(sc));
196
197 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
198 if (!tl_cmd) {
199 pr_err("Unable to allocate struct tcm_loop_cmd\n");
200 set_host_byte(sc, DID_ERROR);
201 sc->scsi_done(sc);
202 return 0;
203 }
204
205 tl_cmd->sc = sc;
206 tl_cmd->sc_cmd_tag = sc->request->tag;
207 INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
208 queue_work(tcm_loop_workqueue, &tl_cmd->work);
209 return 0;
210}
211
212/*
213 * Called from SCSI EH process context to issue a LUN_RESET TMR
214 * to struct scsi_device
215 */
216static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
217 u64 lun, int task, enum tcm_tmreq_table tmr)
218{
219 struct se_cmd *se_cmd = NULL;
220 struct se_session *se_sess;
221 struct se_portal_group *se_tpg;
222 struct tcm_loop_nexus *tl_nexus;
223 struct tcm_loop_cmd *tl_cmd = NULL;
224 struct tcm_loop_tmr *tl_tmr = NULL;
225 int ret = TMR_FUNCTION_FAILED, rc;
226
227 /*
228 * Locate the tl_nexus and se_sess pointers
229 */
230 tl_nexus = tl_tpg->tl_nexus;
231 if (!tl_nexus) {
232 pr_err("Unable to perform device reset without"
233 " active I_T Nexus\n");
234 return ret;
235 }
236
237 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
238 if (!tl_cmd) {
239 pr_err("Unable to allocate memory for tl_cmd\n");
240 return ret;
241 }
242
243 tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL);
244 if (!tl_tmr) {
245 pr_err("Unable to allocate memory for tl_tmr\n");
246 goto release;
247 }
248 init_waitqueue_head(&tl_tmr->tl_tmr_wait);
249
250 se_cmd = &tl_cmd->tl_se_cmd;
251 se_tpg = &tl_tpg->tl_se_tpg;
252 se_sess = tl_tpg->tl_nexus->se_sess;
253 /*
254 * Initialize struct se_cmd descriptor from target_core_mod infrastructure
255 */
256 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0,
257 DMA_NONE, TCM_SIMPLE_TAG,
258 &tl_cmd->tl_sense_buf[0]);
259
260 rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL);
261 if (rc < 0)
262 goto release;
263
264 if (tmr == TMR_ABORT_TASK)
265 se_cmd->se_tmr_req->ref_task_tag = task;
266
267 /*
268 * Locate the underlying TCM struct se_lun
269 */
270 if (transport_lookup_tmr_lun(se_cmd, lun) < 0) {
271 ret = TMR_LUN_DOES_NOT_EXIST;
272 goto release;
273 }
274 /*
275 * Queue the TMR to TCM Core and sleep waiting for
276 * tcm_loop_queue_tm_rsp() to wake us up.
277 */
278 transport_generic_handle_tmr(se_cmd);
279 wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete));
280 /*
281 * The TMR LUN_RESET has completed, check the response status and
282 * then release allocations.
283 */
284 ret = se_cmd->se_tmr_req->response;
285release:
286 if (se_cmd)
287 transport_generic_free_cmd(se_cmd, 1);
288 else
289 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
290 kfree(tl_tmr);
291 return ret;
292}
293
294static int tcm_loop_abort_task(struct scsi_cmnd *sc)
295{
296 struct tcm_loop_hba *tl_hba;
297 struct tcm_loop_tpg *tl_tpg;
298 int ret = FAILED;
299
300 /*
301 * Locate the tcm_loop_hba_t pointer
302 */
303 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
304 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
305 ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
306 sc->request->tag, TMR_ABORT_TASK);
307 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
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 tcm_loop_hba *tl_hba;
317 struct tcm_loop_tpg *tl_tpg;
318 int ret = FAILED;
319
320 /*
321 * Locate the tcm_loop_hba_t pointer
322 */
323 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
324 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
325
326 ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
327 0, TMR_LUN_RESET);
328 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
329}
330
331static int tcm_loop_target_reset(struct scsi_cmnd *sc)
332{
333 struct tcm_loop_hba *tl_hba;
334 struct tcm_loop_tpg *tl_tpg;
335
336 /*
337 * Locate the tcm_loop_hba_t pointer
338 */
339 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
340 if (!tl_hba) {
341 pr_err("Unable to perform device reset without"
342 " active I_T Nexus\n");
343 return FAILED;
344 }
345 /*
346 * Locate the tl_tpg pointer from TargetID in sc->device->id
347 */
348 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
349 if (tl_tpg) {
350 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
351 return SUCCESS;
352 }
353 return FAILED;
354}
355
356static int tcm_loop_slave_alloc(struct scsi_device *sd)
357{
358 set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags);
359 return 0;
360}
361
362static struct scsi_host_template tcm_loop_driver_template = {
363 .show_info = tcm_loop_show_info,
364 .proc_name = "tcm_loopback",
365 .name = "TCM_Loopback",
366 .queuecommand = tcm_loop_queuecommand,
367 .change_queue_depth = scsi_change_queue_depth,
368 .eh_abort_handler = tcm_loop_abort_task,
369 .eh_device_reset_handler = tcm_loop_device_reset,
370 .eh_target_reset_handler = tcm_loop_target_reset,
371 .can_queue = 1024,
372 .this_id = -1,
373 .sg_tablesize = 256,
374 .cmd_per_lun = 1024,
375 .max_sectors = 0xFFFF,
376 .use_clustering = DISABLE_CLUSTERING,
377 .slave_alloc = tcm_loop_slave_alloc,
378 .module = THIS_MODULE,
379 .track_queue_depth = 1,
380};
381
382static int tcm_loop_driver_probe(struct device *dev)
383{
384 struct tcm_loop_hba *tl_hba;
385 struct Scsi_Host *sh;
386 int error, host_prot;
387
388 tl_hba = to_tcm_loop_hba(dev);
389
390 sh = scsi_host_alloc(&tcm_loop_driver_template,
391 sizeof(struct tcm_loop_hba));
392 if (!sh) {
393 pr_err("Unable to allocate struct scsi_host\n");
394 return -ENODEV;
395 }
396 tl_hba->sh = sh;
397
398 /*
399 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
400 */
401 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
402 /*
403 * Setup single ID, Channel and LUN for now..
404 */
405 sh->max_id = 2;
406 sh->max_lun = 0;
407 sh->max_channel = 0;
408 sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
409
410 host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
411 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
412 SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
413
414 scsi_host_set_prot(sh, host_prot);
415 scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
416
417 error = scsi_add_host(sh, &tl_hba->dev);
418 if (error) {
419 pr_err("%s: scsi_add_host failed\n", __func__);
420 scsi_host_put(sh);
421 return -ENODEV;
422 }
423 return 0;
424}
425
426static int tcm_loop_driver_remove(struct device *dev)
427{
428 struct tcm_loop_hba *tl_hba;
429 struct Scsi_Host *sh;
430
431 tl_hba = to_tcm_loop_hba(dev);
432 sh = tl_hba->sh;
433
434 scsi_remove_host(sh);
435 scsi_host_put(sh);
436 return 0;
437}
438
439static void tcm_loop_release_adapter(struct device *dev)
440{
441 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
442
443 kfree(tl_hba);
444}
445
446/*
447 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
448 */
449static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
450{
451 int ret;
452
453 tl_hba->dev.bus = &tcm_loop_lld_bus;
454 tl_hba->dev.parent = tcm_loop_primary;
455 tl_hba->dev.release = &tcm_loop_release_adapter;
456 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
457
458 ret = device_register(&tl_hba->dev);
459 if (ret) {
460 pr_err("device_register() failed for"
461 " tl_hba->dev: %d\n", ret);
462 return -ENODEV;
463 }
464
465 return 0;
466}
467
468/*
469 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
470 * tcm_loop SCSI bus.
471 */
472static int tcm_loop_alloc_core_bus(void)
473{
474 int ret;
475
476 tcm_loop_primary = root_device_register("tcm_loop_0");
477 if (IS_ERR(tcm_loop_primary)) {
478 pr_err("Unable to allocate tcm_loop_primary\n");
479 return PTR_ERR(tcm_loop_primary);
480 }
481
482 ret = bus_register(&tcm_loop_lld_bus);
483 if (ret) {
484 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
485 goto dev_unreg;
486 }
487
488 ret = driver_register(&tcm_loop_driverfs);
489 if (ret) {
490 pr_err("driver_register() failed for"
491 "tcm_loop_driverfs\n");
492 goto bus_unreg;
493 }
494
495 pr_debug("Initialized TCM Loop Core Bus\n");
496 return ret;
497
498bus_unreg:
499 bus_unregister(&tcm_loop_lld_bus);
500dev_unreg:
501 root_device_unregister(tcm_loop_primary);
502 return ret;
503}
504
505static void tcm_loop_release_core_bus(void)
506{
507 driver_unregister(&tcm_loop_driverfs);
508 bus_unregister(&tcm_loop_lld_bus);
509 root_device_unregister(tcm_loop_primary);
510
511 pr_debug("Releasing TCM Loop Core BUS\n");
512}
513
514static char *tcm_loop_get_fabric_name(void)
515{
516 return "loopback";
517}
518
519static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
520{
521 return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
522}
523
524static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
525{
526 /*
527 * Return the passed NAA identifier for the Target Port
528 */
529 return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
530}
531
532static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
533{
534 /*
535 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
536 * to represent the SCSI Target Port.
537 */
538 return tl_tpg(se_tpg)->tl_tpgt;
539}
540
541/*
542 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
543 * based upon the incoming fabric dependent SCSI Initiator Port
544 */
545static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
546{
547 return 1;
548}
549
550static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
551{
552 return 0;
553}
554
555/*
556 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
557 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
558 */
559static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
560{
561 return 0;
562}
563
564/*
565 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
566 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
567 * It has been added here as a nop for target_fabric_tf_ops_check()
568 */
569static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
570{
571 return 0;
572}
573
574static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
575{
576 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
577 tl_se_tpg);
578 return tl_tpg->tl_fabric_prot_type;
579}
580
581static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
582{
583 return 1;
584}
585
586static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
587{
588 return 1;
589}
590
591static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
592{
593 return;
594}
595
596static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
597{
598 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
599 struct tcm_loop_cmd, tl_se_cmd);
600
601 return tl_cmd->sc_cmd_state;
602}
603
604static int tcm_loop_shutdown_session(struct se_session *se_sess)
605{
606 return 0;
607}
608
609static void tcm_loop_close_session(struct se_session *se_sess)
610{
611 return;
612};
613
614static int tcm_loop_write_pending(struct se_cmd *se_cmd)
615{
616 /*
617 * Since Linux/SCSI has already sent down a struct scsi_cmnd
618 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
619 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
620 * format with transport_generic_map_mem_to_cmd().
621 *
622 * We now tell TCM to add this WRITE CDB directly into the TCM storage
623 * object execution queue.
624 */
625 target_execute_cmd(se_cmd);
626 return 0;
627}
628
629static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
630{
631 return 0;
632}
633
634static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
635{
636 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
637 struct tcm_loop_cmd, tl_se_cmd);
638 struct scsi_cmnd *sc = tl_cmd->sc;
639
640 pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p"
641 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
642
643 sc->result = SAM_STAT_GOOD;
644 set_host_byte(sc, DID_OK);
645 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
646 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
647 scsi_set_resid(sc, se_cmd->residual_count);
648 sc->scsi_done(sc);
649 return 0;
650}
651
652static int tcm_loop_queue_status(struct se_cmd *se_cmd)
653{
654 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
655 struct tcm_loop_cmd, tl_se_cmd);
656 struct scsi_cmnd *sc = tl_cmd->sc;
657
658 pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p"
659 " cdb: 0x%02x\n", sc, sc->cmnd[0]);
660
661 if (se_cmd->sense_buffer &&
662 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
663 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
664
665 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
666 SCSI_SENSE_BUFFERSIZE);
667 sc->result = SAM_STAT_CHECK_CONDITION;
668 set_driver_byte(sc, DRIVER_SENSE);
669 } else
670 sc->result = se_cmd->scsi_status;
671
672 set_host_byte(sc, DID_OK);
673 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
674 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
675 scsi_set_resid(sc, se_cmd->residual_count);
676 sc->scsi_done(sc);
677 return 0;
678}
679
680static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
681{
682 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
683 struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr;
684 /*
685 * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead
686 * and wake up the wait_queue_head_t in tcm_loop_device_reset()
687 */
688 atomic_set(&tl_tmr->tmr_complete, 1);
689 wake_up(&tl_tmr->tl_tmr_wait);
690}
691
692static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
693{
694 return;
695}
696
697static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
698{
699 switch (tl_hba->tl_proto_id) {
700 case SCSI_PROTOCOL_SAS:
701 return "SAS";
702 case SCSI_PROTOCOL_FCP:
703 return "FCP";
704 case SCSI_PROTOCOL_ISCSI:
705 return "iSCSI";
706 default:
707 break;
708 }
709
710 return "Unknown";
711}
712
713/* Start items for tcm_loop_port_cit */
714
715static int tcm_loop_port_link(
716 struct se_portal_group *se_tpg,
717 struct se_lun *lun)
718{
719 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
720 struct tcm_loop_tpg, tl_se_tpg);
721 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
722
723 atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
724 /*
725 * Add Linux/SCSI struct scsi_device by HCTL
726 */
727 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
728
729 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
730 return 0;
731}
732
733static void tcm_loop_port_unlink(
734 struct se_portal_group *se_tpg,
735 struct se_lun *se_lun)
736{
737 struct scsi_device *sd;
738 struct tcm_loop_hba *tl_hba;
739 struct tcm_loop_tpg *tl_tpg;
740
741 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
742 tl_hba = tl_tpg->tl_hba;
743
744 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
745 se_lun->unpacked_lun);
746 if (!sd) {
747 pr_err("Unable to locate struct scsi_device for %d:%d:"
748 "%llu\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
749 return;
750 }
751 /*
752 * Remove Linux/SCSI struct scsi_device by HCTL
753 */
754 scsi_remove_device(sd);
755 scsi_device_put(sd);
756
757 atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
758
759 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
760}
761
762/* End items for tcm_loop_port_cit */
763
764static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
765 struct config_item *item, char *page)
766{
767 struct se_portal_group *se_tpg = attrib_to_tpg(item);
768 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
769 tl_se_tpg);
770
771 return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
772}
773
774static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
775 struct config_item *item, const char *page, size_t count)
776{
777 struct se_portal_group *se_tpg = attrib_to_tpg(item);
778 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
779 tl_se_tpg);
780 unsigned long val;
781 int ret = kstrtoul(page, 0, &val);
782
783 if (ret) {
784 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
785 return ret;
786 }
787 if (val != 0 && val != 1 && val != 3) {
788 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
789 return -EINVAL;
790 }
791 tl_tpg->tl_fabric_prot_type = val;
792
793 return count;
794}
795
796CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
797
798static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
799 &tcm_loop_tpg_attrib_attr_fabric_prot_type,
800 NULL,
801};
802
803/* Start items for tcm_loop_nexus_cit */
804
805static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg,
806 struct se_session *se_sess, void *p)
807{
808 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
809 struct tcm_loop_tpg, tl_se_tpg);
810
811 tl_tpg->tl_nexus = p;
812 return 0;
813}
814
815static int tcm_loop_make_nexus(
816 struct tcm_loop_tpg *tl_tpg,
817 const char *name)
818{
819 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
820 struct tcm_loop_nexus *tl_nexus;
821 int ret;
822
823 if (tl_tpg->tl_nexus) {
824 pr_debug("tl_tpg->tl_nexus already exists\n");
825 return -EEXIST;
826 }
827
828 tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL);
829 if (!tl_nexus) {
830 pr_err("Unable to allocate struct tcm_loop_nexus\n");
831 return -ENOMEM;
832 }
833
834 tl_nexus->se_sess = target_alloc_session(&tl_tpg->tl_se_tpg, 0, 0,
835 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
836 name, tl_nexus, tcm_loop_alloc_sess_cb);
837 if (IS_ERR(tl_nexus->se_sess)) {
838 ret = PTR_ERR(tl_nexus->se_sess);
839 kfree(tl_nexus);
840 return ret;
841 }
842
843 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated"
844 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba),
845 name);
846 return 0;
847}
848
849static int tcm_loop_drop_nexus(
850 struct tcm_loop_tpg *tpg)
851{
852 struct se_session *se_sess;
853 struct tcm_loop_nexus *tl_nexus;
854
855 tl_nexus = tpg->tl_nexus;
856 if (!tl_nexus)
857 return -ENODEV;
858
859 se_sess = tl_nexus->se_sess;
860 if (!se_sess)
861 return -ENODEV;
862
863 if (atomic_read(&tpg->tl_tpg_port_count)) {
864 pr_err("Unable to remove TCM_Loop I_T Nexus with"
865 " active TPG port count: %d\n",
866 atomic_read(&tpg->tl_tpg_port_count));
867 return -EPERM;
868 }
869
870 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated"
871 " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba),
872 tl_nexus->se_sess->se_node_acl->initiatorname);
873 /*
874 * Release the SCSI I_T Nexus to the emulated Target Port
875 */
876 transport_deregister_session(tl_nexus->se_sess);
877 tpg->tl_nexus = NULL;
878 kfree(tl_nexus);
879 return 0;
880}
881
882/* End items for tcm_loop_nexus_cit */
883
884static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
885{
886 struct se_portal_group *se_tpg = to_tpg(item);
887 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
888 struct tcm_loop_tpg, tl_se_tpg);
889 struct tcm_loop_nexus *tl_nexus;
890 ssize_t ret;
891
892 tl_nexus = tl_tpg->tl_nexus;
893 if (!tl_nexus)
894 return -ENODEV;
895
896 ret = snprintf(page, PAGE_SIZE, "%s\n",
897 tl_nexus->se_sess->se_node_acl->initiatorname);
898
899 return ret;
900}
901
902static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
903 const char *page, size_t count)
904{
905 struct se_portal_group *se_tpg = to_tpg(item);
906 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
907 struct tcm_loop_tpg, tl_se_tpg);
908 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
909 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
910 int ret;
911 /*
912 * Shutdown the active I_T nexus if 'NULL' is passed..
913 */
914 if (!strncmp(page, "NULL", 4)) {
915 ret = tcm_loop_drop_nexus(tl_tpg);
916 return (!ret) ? count : ret;
917 }
918 /*
919 * Otherwise make sure the passed virtual Initiator port WWN matches
920 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
921 * tcm_loop_make_nexus()
922 */
923 if (strlen(page) >= TL_WWN_ADDR_LEN) {
924 pr_err("Emulated NAA Sas Address: %s, exceeds"
925 " max: %d\n", page, TL_WWN_ADDR_LEN);
926 return -EINVAL;
927 }
928 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
929
930 ptr = strstr(i_port, "naa.");
931 if (ptr) {
932 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
933 pr_err("Passed SAS Initiator Port %s does not"
934 " match target port protoid: %s\n", i_port,
935 tcm_loop_dump_proto_id(tl_hba));
936 return -EINVAL;
937 }
938 port_ptr = &i_port[0];
939 goto check_newline;
940 }
941 ptr = strstr(i_port, "fc.");
942 if (ptr) {
943 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
944 pr_err("Passed FCP Initiator Port %s does not"
945 " match target port protoid: %s\n", i_port,
946 tcm_loop_dump_proto_id(tl_hba));
947 return -EINVAL;
948 }
949 port_ptr = &i_port[3]; /* Skip over "fc." */
950 goto check_newline;
951 }
952 ptr = strstr(i_port, "iqn.");
953 if (ptr) {
954 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
955 pr_err("Passed iSCSI Initiator Port %s does not"
956 " match target port protoid: %s\n", i_port,
957 tcm_loop_dump_proto_id(tl_hba));
958 return -EINVAL;
959 }
960 port_ptr = &i_port[0];
961 goto check_newline;
962 }
963 pr_err("Unable to locate prefix for emulated Initiator Port:"
964 " %s\n", i_port);
965 return -EINVAL;
966 /*
967 * Clear any trailing newline for the NAA WWN
968 */
969check_newline:
970 if (i_port[strlen(i_port)-1] == '\n')
971 i_port[strlen(i_port)-1] = '\0';
972
973 ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
974 if (ret < 0)
975 return ret;
976
977 return count;
978}
979
980static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
981 char *page)
982{
983 struct se_portal_group *se_tpg = to_tpg(item);
984 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
985 struct tcm_loop_tpg, tl_se_tpg);
986 const char *status = NULL;
987 ssize_t ret = -EINVAL;
988
989 switch (tl_tpg->tl_transport_status) {
990 case TCM_TRANSPORT_ONLINE:
991 status = "online";
992 break;
993 case TCM_TRANSPORT_OFFLINE:
994 status = "offline";
995 break;
996 default:
997 break;
998 }
999
1000 if (status)
1001 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
1002
1003 return ret;
1004}
1005
1006static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
1007 const char *page, size_t count)
1008{
1009 struct se_portal_group *se_tpg = to_tpg(item);
1010 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1011 struct tcm_loop_tpg, tl_se_tpg);
1012
1013 if (!strncmp(page, "online", 6)) {
1014 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
1015 return count;
1016 }
1017 if (!strncmp(page, "offline", 7)) {
1018 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
1019 if (tl_tpg->tl_nexus) {
1020 struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
1021
1022 core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
1023 }
1024 return count;
1025 }
1026 return -EINVAL;
1027}
1028
1029static ssize_t tcm_loop_tpg_address_show(struct config_item *item,
1030 char *page)
1031{
1032 struct se_portal_group *se_tpg = to_tpg(item);
1033 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1034 struct tcm_loop_tpg, tl_se_tpg);
1035 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
1036
1037 return snprintf(page, PAGE_SIZE, "%d:0:%d\n",
1038 tl_hba->sh->host_no, tl_tpg->tl_tpgt);
1039}
1040
1041CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
1042CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
1043CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
1044
1045static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
1046 &tcm_loop_tpg_attr_nexus,
1047 &tcm_loop_tpg_attr_transport_status,
1048 &tcm_loop_tpg_attr_address,
1049 NULL,
1050};
1051
1052/* Start items for tcm_loop_naa_cit */
1053
1054static struct se_portal_group *tcm_loop_make_naa_tpg(
1055 struct se_wwn *wwn,
1056 struct config_group *group,
1057 const char *name)
1058{
1059 struct tcm_loop_hba *tl_hba = container_of(wwn,
1060 struct tcm_loop_hba, tl_hba_wwn);
1061 struct tcm_loop_tpg *tl_tpg;
1062 int ret;
1063 unsigned long tpgt;
1064
1065 if (strstr(name, "tpgt_") != name) {
1066 pr_err("Unable to locate \"tpgt_#\" directory"
1067 " group\n");
1068 return ERR_PTR(-EINVAL);
1069 }
1070 if (kstrtoul(name+5, 10, &tpgt))
1071 return ERR_PTR(-EINVAL);
1072
1073 if (tpgt >= TL_TPGS_PER_HBA) {
1074 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA:"
1075 " %u\n", tpgt, TL_TPGS_PER_HBA);
1076 return ERR_PTR(-EINVAL);
1077 }
1078 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1079 tl_tpg->tl_hba = tl_hba;
1080 tl_tpg->tl_tpgt = tpgt;
1081 /*
1082 * Register the tl_tpg as a emulated TCM Target Endpoint
1083 */
1084 ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
1085 if (ret < 0)
1086 return ERR_PTR(-ENOMEM);
1087
1088 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
1089 " Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba),
1090 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1091
1092 return &tl_tpg->tl_se_tpg;
1093}
1094
1095static void tcm_loop_drop_naa_tpg(
1096 struct se_portal_group *se_tpg)
1097{
1098 struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1099 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1100 struct tcm_loop_tpg, tl_se_tpg);
1101 struct tcm_loop_hba *tl_hba;
1102 unsigned short tpgt;
1103
1104 tl_hba = tl_tpg->tl_hba;
1105 tpgt = tl_tpg->tl_tpgt;
1106 /*
1107 * Release the I_T Nexus for the Virtual target link if present
1108 */
1109 tcm_loop_drop_nexus(tl_tpg);
1110 /*
1111 * Deregister the tl_tpg as a emulated TCM Target Endpoint
1112 */
1113 core_tpg_deregister(se_tpg);
1114
1115 tl_tpg->tl_hba = NULL;
1116 tl_tpg->tl_tpgt = 0;
1117
1118 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s"
1119 " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
1120 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1121}
1122
1123/* End items for tcm_loop_naa_cit */
1124
1125/* Start items for tcm_loop_cit */
1126
1127static struct se_wwn *tcm_loop_make_scsi_hba(
1128 struct target_fabric_configfs *tf,
1129 struct config_group *group,
1130 const char *name)
1131{
1132 struct tcm_loop_hba *tl_hba;
1133 struct Scsi_Host *sh;
1134 char *ptr;
1135 int ret, off = 0;
1136
1137 tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL);
1138 if (!tl_hba) {
1139 pr_err("Unable to allocate struct tcm_loop_hba\n");
1140 return ERR_PTR(-ENOMEM);
1141 }
1142 /*
1143 * Determine the emulated Protocol Identifier and Target Port Name
1144 * based on the incoming configfs directory name.
1145 */
1146 ptr = strstr(name, "naa.");
1147 if (ptr) {
1148 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1149 goto check_len;
1150 }
1151 ptr = strstr(name, "fc.");
1152 if (ptr) {
1153 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1154 off = 3; /* Skip over "fc." */
1155 goto check_len;
1156 }
1157 ptr = strstr(name, "iqn.");
1158 if (!ptr) {
1159 pr_err("Unable to locate prefix for emulated Target "
1160 "Port: %s\n", name);
1161 ret = -EINVAL;
1162 goto out;
1163 }
1164 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1165
1166check_len:
1167 if (strlen(name) >= TL_WWN_ADDR_LEN) {
1168 pr_err("Emulated NAA %s Address: %s, exceeds"
1169 " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba),
1170 TL_WWN_ADDR_LEN);
1171 ret = -EINVAL;
1172 goto out;
1173 }
1174 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1175
1176 /*
1177 * Call device_register(tl_hba->dev) to register the emulated
1178 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1179 * device_register() callbacks in tcm_loop_driver_probe()
1180 */
1181 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1182 if (ret)
1183 goto out;
1184
1185 sh = tl_hba->sh;
1186 tcm_loop_hba_no_cnt++;
1187 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target"
1188 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1189 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1190
1191 return &tl_hba->tl_hba_wwn;
1192out:
1193 kfree(tl_hba);
1194 return ERR_PTR(ret);
1195}
1196
1197static void tcm_loop_drop_scsi_hba(
1198 struct se_wwn *wwn)
1199{
1200 struct tcm_loop_hba *tl_hba = container_of(wwn,
1201 struct tcm_loop_hba, tl_hba_wwn);
1202
1203 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target"
1204 " %s Address: %s at Linux/SCSI Host ID: %d\n",
1205 tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
1206 tl_hba->sh->host_no);
1207 /*
1208 * Call device_unregister() on the original tl_hba->dev.
1209 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1210 * release *tl_hba;
1211 */
1212 device_unregister(&tl_hba->dev);
1213}
1214
1215/* Start items for tcm_loop_cit */
1216static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
1217{
1218 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1219}
1220
1221CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
1222
1223static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1224 &tcm_loop_wwn_attr_version,
1225 NULL,
1226};
1227
1228/* End items for tcm_loop_cit */
1229
1230static const struct target_core_fabric_ops loop_ops = {
1231 .module = THIS_MODULE,
1232 .name = "loopback",
1233 .get_fabric_name = tcm_loop_get_fabric_name,
1234 .tpg_get_wwn = tcm_loop_get_endpoint_wwn,
1235 .tpg_get_tag = tcm_loop_get_tag,
1236 .tpg_check_demo_mode = tcm_loop_check_demo_mode,
1237 .tpg_check_demo_mode_cache = tcm_loop_check_demo_mode_cache,
1238 .tpg_check_demo_mode_write_protect =
1239 tcm_loop_check_demo_mode_write_protect,
1240 .tpg_check_prod_mode_write_protect =
1241 tcm_loop_check_prod_mode_write_protect,
1242 .tpg_check_prot_fabric_only = tcm_loop_check_prot_fabric_only,
1243 .tpg_get_inst_index = tcm_loop_get_inst_index,
1244 .check_stop_free = tcm_loop_check_stop_free,
1245 .release_cmd = tcm_loop_release_cmd,
1246 .shutdown_session = tcm_loop_shutdown_session,
1247 .close_session = tcm_loop_close_session,
1248 .sess_get_index = tcm_loop_sess_get_index,
1249 .write_pending = tcm_loop_write_pending,
1250 .write_pending_status = tcm_loop_write_pending_status,
1251 .set_default_node_attributes = tcm_loop_set_default_node_attributes,
1252 .get_cmd_state = tcm_loop_get_cmd_state,
1253 .queue_data_in = tcm_loop_queue_data_in,
1254 .queue_status = tcm_loop_queue_status,
1255 .queue_tm_rsp = tcm_loop_queue_tm_rsp,
1256 .aborted_task = tcm_loop_aborted_task,
1257 .fabric_make_wwn = tcm_loop_make_scsi_hba,
1258 .fabric_drop_wwn = tcm_loop_drop_scsi_hba,
1259 .fabric_make_tpg = tcm_loop_make_naa_tpg,
1260 .fabric_drop_tpg = tcm_loop_drop_naa_tpg,
1261 .fabric_post_link = tcm_loop_port_link,
1262 .fabric_pre_unlink = tcm_loop_port_unlink,
1263 .tfc_wwn_attrs = tcm_loop_wwn_attrs,
1264 .tfc_tpg_base_attrs = tcm_loop_tpg_attrs,
1265 .tfc_tpg_attrib_attrs = tcm_loop_tpg_attrib_attrs,
1266};
1267
1268static int __init tcm_loop_fabric_init(void)
1269{
1270 int ret = -ENOMEM;
1271
1272 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1273 if (!tcm_loop_workqueue)
1274 goto out;
1275
1276 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1277 sizeof(struct tcm_loop_cmd),
1278 __alignof__(struct tcm_loop_cmd),
1279 0, NULL);
1280 if (!tcm_loop_cmd_cache) {
1281 pr_debug("kmem_cache_create() for"
1282 " tcm_loop_cmd_cache failed\n");
1283 goto out_destroy_workqueue;
1284 }
1285
1286 ret = tcm_loop_alloc_core_bus();
1287 if (ret)
1288 goto out_destroy_cache;
1289
1290 ret = target_register_template(&loop_ops);
1291 if (ret)
1292 goto out_release_core_bus;
1293
1294 return 0;
1295
1296out_release_core_bus:
1297 tcm_loop_release_core_bus();
1298out_destroy_cache:
1299 kmem_cache_destroy(tcm_loop_cmd_cache);
1300out_destroy_workqueue:
1301 destroy_workqueue(tcm_loop_workqueue);
1302out:
1303 return ret;
1304}
1305
1306static void __exit tcm_loop_fabric_exit(void)
1307{
1308 target_unregister_template(&loop_ops);
1309 tcm_loop_release_core_bus();
1310 kmem_cache_destroy(tcm_loop_cmd_cache);
1311 destroy_workqueue(tcm_loop_workqueue);
1312}
1313
1314MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1315MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1316MODULE_LICENSE("GPL");
1317module_init(tcm_loop_fabric_init);
1318module_exit(tcm_loop_fabric_exit);