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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 2011-2013 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 kmem_cache *tcm_loop_cmd_cache;
43
44static int tcm_loop_hba_no_cnt;
45
46static int tcm_loop_queue_status(struct se_cmd *se_cmd);
47
48static unsigned int tcm_loop_nr_hw_queues = 1;
49module_param_named(nr_hw_queues, tcm_loop_nr_hw_queues, uint, 0644);
50
51static unsigned int tcm_loop_can_queue = 1024;
52module_param_named(can_queue, tcm_loop_can_queue, uint, 0644);
53
54static unsigned int tcm_loop_cmd_per_lun = 1024;
55module_param_named(cmd_per_lun, tcm_loop_cmd_per_lun, uint, 0644);
56
57/*
58 * Called from struct target_core_fabric_ops->check_stop_free()
59 */
60static int tcm_loop_check_stop_free(struct se_cmd *se_cmd)
61{
62 return transport_generic_free_cmd(se_cmd, 0);
63}
64
65static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
66{
67 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
68 struct tcm_loop_cmd, tl_se_cmd);
69 struct scsi_cmnd *sc = tl_cmd->sc;
70
71 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
72 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
73 else
74 scsi_done(sc);
75}
76
77static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
78{
79 seq_puts(m, "tcm_loop_proc_info()\n");
80 return 0;
81}
82
83static int tcm_loop_driver_probe(struct device *);
84static void 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_target_queue_cmd(struct tcm_loop_cmd *tl_cmd)
109{
110 struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
111 struct scsi_cmnd *sc = tl_cmd->sc;
112 struct tcm_loop_nexus *tl_nexus;
113 struct tcm_loop_hba *tl_hba;
114 struct tcm_loop_tpg *tl_tpg;
115 struct scatterlist *sgl_bidi = NULL;
116 u32 sgl_bidi_count = 0, transfer_length;
117
118 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
119 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
120
121 /*
122 * Ensure that this tl_tpg reference from the incoming sc->device->id
123 * has already been configured via tcm_loop_make_naa_tpg().
124 */
125 if (!tl_tpg->tl_hba) {
126 set_host_byte(sc, DID_NO_CONNECT);
127 goto out_done;
128 }
129 if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
130 set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
131 goto out_done;
132 }
133 tl_nexus = tl_tpg->tl_nexus;
134 if (!tl_nexus) {
135 scmd_printk(KERN_ERR, sc,
136 "TCM_Loop I_T Nexus does not exist\n");
137 set_host_byte(sc, DID_ERROR);
138 goto out_done;
139 }
140
141 transfer_length = scsi_transfer_length(sc);
142 if (!scsi_prot_sg_count(sc) &&
143 scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
144 se_cmd->prot_pto = true;
145 /*
146 * loopback transport doesn't support
147 * WRITE_GENERATE, READ_STRIP protection
148 * information operations, go ahead unprotected.
149 */
150 transfer_length = scsi_bufflen(sc);
151 }
152
153 se_cmd->tag = tl_cmd->sc_cmd_tag;
154 target_init_cmd(se_cmd, tl_nexus->se_sess, &tl_cmd->tl_sense_buf[0],
155 tl_cmd->sc->device->lun, transfer_length,
156 TCM_SIMPLE_TAG, sc->sc_data_direction, 0);
157
158 if (target_submit_prep(se_cmd, sc->cmnd, scsi_sglist(sc),
159 scsi_sg_count(sc), sgl_bidi, sgl_bidi_count,
160 scsi_prot_sglist(sc), scsi_prot_sg_count(sc),
161 GFP_ATOMIC))
162 return;
163
164 target_queue_submission(se_cmd);
165 return;
166
167out_done:
168 scsi_done(sc);
169}
170
171/*
172 * ->queuecommand can be and usually is called from interrupt context, so
173 * defer the actual submission to a workqueue.
174 */
175static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
176{
177 struct tcm_loop_cmd *tl_cmd = scsi_cmd_priv(sc);
178
179 pr_debug("%s() %d:%d:%d:%llu got CDB: 0x%02x scsi_buf_len: %u\n",
180 __func__, sc->device->host->host_no, sc->device->id,
181 sc->device->channel, sc->device->lun, sc->cmnd[0],
182 scsi_bufflen(sc));
183
184 memset(tl_cmd, 0, sizeof(*tl_cmd));
185 tl_cmd->sc = sc;
186 tl_cmd->sc_cmd_tag = scsi_cmd_to_rq(sc)->tag;
187
188 tcm_loop_target_queue_cmd(tl_cmd);
189 return 0;
190}
191
192/*
193 * Called from SCSI EH process context to issue a LUN_RESET TMR
194 * to struct scsi_device
195 */
196static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
197 u64 lun, int task, enum tcm_tmreq_table tmr)
198{
199 struct se_cmd *se_cmd;
200 struct se_session *se_sess;
201 struct tcm_loop_nexus *tl_nexus;
202 struct tcm_loop_cmd *tl_cmd;
203 int ret = TMR_FUNCTION_FAILED, rc;
204
205 /*
206 * Locate the tl_nexus and se_sess pointers
207 */
208 tl_nexus = tl_tpg->tl_nexus;
209 if (!tl_nexus) {
210 pr_err("Unable to perform device reset without active I_T Nexus\n");
211 return ret;
212 }
213
214 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
215 if (!tl_cmd)
216 return ret;
217
218 init_completion(&tl_cmd->tmr_done);
219
220 se_cmd = &tl_cmd->tl_se_cmd;
221 se_sess = tl_tpg->tl_nexus->se_sess;
222
223 rc = target_submit_tmr(se_cmd, se_sess, tl_cmd->tl_sense_buf, lun,
224 NULL, tmr, GFP_KERNEL, task,
225 TARGET_SCF_ACK_KREF);
226 if (rc < 0)
227 goto release;
228 wait_for_completion(&tl_cmd->tmr_done);
229 ret = se_cmd->se_tmr_req->response;
230 target_put_sess_cmd(se_cmd);
231
232out:
233 return ret;
234
235release:
236 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
237 goto out;
238}
239
240static int tcm_loop_abort_task(struct scsi_cmnd *sc)
241{
242 struct tcm_loop_hba *tl_hba;
243 struct tcm_loop_tpg *tl_tpg;
244 int ret;
245
246 /*
247 * Locate the tcm_loop_hba_t pointer
248 */
249 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
250 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
251 ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
252 scsi_cmd_to_rq(sc)->tag, TMR_ABORT_TASK);
253 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
254}
255
256/*
257 * Called from SCSI EH process context to issue a LUN_RESET TMR
258 * to struct scsi_device
259 */
260static int tcm_loop_device_reset(struct scsi_cmnd *sc)
261{
262 struct tcm_loop_hba *tl_hba;
263 struct tcm_loop_tpg *tl_tpg;
264 int ret;
265
266 /*
267 * Locate the tcm_loop_hba_t pointer
268 */
269 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
270 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
271
272 ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
273 0, TMR_LUN_RESET);
274 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
275}
276
277static int tcm_loop_target_reset(struct scsi_cmnd *sc)
278{
279 struct tcm_loop_hba *tl_hba;
280 struct tcm_loop_tpg *tl_tpg;
281
282 /*
283 * Locate the tcm_loop_hba_t pointer
284 */
285 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
286 if (!tl_hba) {
287 pr_err("Unable to perform device reset without active I_T Nexus\n");
288 return FAILED;
289 }
290 /*
291 * Locate the tl_tpg pointer from TargetID in sc->device->id
292 */
293 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
294 if (tl_tpg) {
295 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
296 return SUCCESS;
297 }
298 return FAILED;
299}
300
301static struct scsi_host_template tcm_loop_driver_template = {
302 .show_info = tcm_loop_show_info,
303 .proc_name = "tcm_loopback",
304 .name = "TCM_Loopback",
305 .queuecommand = tcm_loop_queuecommand,
306 .change_queue_depth = scsi_change_queue_depth,
307 .eh_abort_handler = tcm_loop_abort_task,
308 .eh_device_reset_handler = tcm_loop_device_reset,
309 .eh_target_reset_handler = tcm_loop_target_reset,
310 .this_id = -1,
311 .sg_tablesize = 256,
312 .max_sectors = 0xFFFF,
313 .dma_boundary = PAGE_SIZE - 1,
314 .module = THIS_MODULE,
315 .track_queue_depth = 1,
316 .cmd_size = sizeof(struct tcm_loop_cmd),
317};
318
319static int tcm_loop_driver_probe(struct device *dev)
320{
321 struct tcm_loop_hba *tl_hba;
322 struct Scsi_Host *sh;
323 int error, host_prot;
324
325 tl_hba = to_tcm_loop_hba(dev);
326
327 sh = scsi_host_alloc(&tcm_loop_driver_template,
328 sizeof(struct tcm_loop_hba));
329 if (!sh) {
330 pr_err("Unable to allocate struct scsi_host\n");
331 return -ENODEV;
332 }
333 tl_hba->sh = sh;
334
335 /*
336 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
337 */
338 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
339 /*
340 * Setup single ID, Channel and LUN for now..
341 */
342 sh->max_id = 2;
343 sh->max_lun = 0;
344 sh->max_channel = 0;
345 sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
346 sh->nr_hw_queues = tcm_loop_nr_hw_queues;
347 sh->can_queue = tcm_loop_can_queue;
348 sh->cmd_per_lun = tcm_loop_cmd_per_lun;
349
350 host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
351 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
352 SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
353
354 scsi_host_set_prot(sh, host_prot);
355 scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
356
357 error = scsi_add_host(sh, &tl_hba->dev);
358 if (error) {
359 pr_err("%s: scsi_add_host failed\n", __func__);
360 scsi_host_put(sh);
361 return -ENODEV;
362 }
363 return 0;
364}
365
366static void tcm_loop_driver_remove(struct device *dev)
367{
368 struct tcm_loop_hba *tl_hba;
369 struct Scsi_Host *sh;
370
371 tl_hba = to_tcm_loop_hba(dev);
372 sh = tl_hba->sh;
373
374 scsi_remove_host(sh);
375 scsi_host_put(sh);
376}
377
378static void tcm_loop_release_adapter(struct device *dev)
379{
380 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
381
382 kfree(tl_hba);
383}
384
385/*
386 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
387 */
388static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
389{
390 int ret;
391
392 tl_hba->dev.bus = &tcm_loop_lld_bus;
393 tl_hba->dev.parent = tcm_loop_primary;
394 tl_hba->dev.release = &tcm_loop_release_adapter;
395 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
396
397 ret = device_register(&tl_hba->dev);
398 if (ret) {
399 pr_err("device_register() failed for tl_hba->dev: %d\n", ret);
400 put_device(&tl_hba->dev);
401 return -ENODEV;
402 }
403
404 return 0;
405}
406
407/*
408 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
409 * tcm_loop SCSI bus.
410 */
411static int tcm_loop_alloc_core_bus(void)
412{
413 int ret;
414
415 tcm_loop_primary = root_device_register("tcm_loop_0");
416 if (IS_ERR(tcm_loop_primary)) {
417 pr_err("Unable to allocate tcm_loop_primary\n");
418 return PTR_ERR(tcm_loop_primary);
419 }
420
421 ret = bus_register(&tcm_loop_lld_bus);
422 if (ret) {
423 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
424 goto dev_unreg;
425 }
426
427 ret = driver_register(&tcm_loop_driverfs);
428 if (ret) {
429 pr_err("driver_register() failed for tcm_loop_driverfs\n");
430 goto bus_unreg;
431 }
432
433 pr_debug("Initialized TCM Loop Core Bus\n");
434 return ret;
435
436bus_unreg:
437 bus_unregister(&tcm_loop_lld_bus);
438dev_unreg:
439 root_device_unregister(tcm_loop_primary);
440 return ret;
441}
442
443static void tcm_loop_release_core_bus(void)
444{
445 driver_unregister(&tcm_loop_driverfs);
446 bus_unregister(&tcm_loop_lld_bus);
447 root_device_unregister(tcm_loop_primary);
448
449 pr_debug("Releasing TCM Loop Core BUS\n");
450}
451
452static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
453{
454 return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
455}
456
457static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
458{
459 /*
460 * Return the passed NAA identifier for the Target Port
461 */
462 return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
463}
464
465static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
466{
467 /*
468 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
469 * to represent the SCSI Target Port.
470 */
471 return tl_tpg(se_tpg)->tl_tpgt;
472}
473
474/*
475 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
476 * based upon the incoming fabric dependent SCSI Initiator Port
477 */
478static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
479{
480 return 1;
481}
482
483static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
484{
485 return 0;
486}
487
488/*
489 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
490 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
491 */
492static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
493{
494 return 0;
495}
496
497/*
498 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
499 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
500 * It has been added here as a nop for target_fabric_tf_ops_check()
501 */
502static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
503{
504 return 0;
505}
506
507static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
508{
509 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
510 tl_se_tpg);
511 return tl_tpg->tl_fabric_prot_type;
512}
513
514static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
515{
516 return 1;
517}
518
519static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
520{
521 return 1;
522}
523
524static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
525{
526 return;
527}
528
529static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
530{
531 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
532 struct tcm_loop_cmd, tl_se_cmd);
533
534 return tl_cmd->sc_cmd_state;
535}
536
537static int tcm_loop_write_pending(struct se_cmd *se_cmd)
538{
539 /*
540 * Since Linux/SCSI has already sent down a struct scsi_cmnd
541 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
542 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
543 * format with transport_generic_map_mem_to_cmd().
544 *
545 * We now tell TCM to add this WRITE CDB directly into the TCM storage
546 * object execution queue.
547 */
548 target_execute_cmd(se_cmd);
549 return 0;
550}
551
552static int tcm_loop_queue_data_or_status(const char *func,
553 struct se_cmd *se_cmd, u8 scsi_status)
554{
555 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
556 struct tcm_loop_cmd, tl_se_cmd);
557 struct scsi_cmnd *sc = tl_cmd->sc;
558
559 pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
560 func, sc, sc->cmnd[0]);
561
562 if (se_cmd->sense_buffer &&
563 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
564 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
565
566 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
567 SCSI_SENSE_BUFFERSIZE);
568 sc->result = SAM_STAT_CHECK_CONDITION;
569 } else
570 sc->result = scsi_status;
571
572 set_host_byte(sc, DID_OK);
573 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
574 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
575 scsi_set_resid(sc, se_cmd->residual_count);
576 return 0;
577}
578
579static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
580{
581 return tcm_loop_queue_data_or_status(__func__, se_cmd, SAM_STAT_GOOD);
582}
583
584static int tcm_loop_queue_status(struct se_cmd *se_cmd)
585{
586 return tcm_loop_queue_data_or_status(__func__,
587 se_cmd, se_cmd->scsi_status);
588}
589
590static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
591{
592 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
593 struct tcm_loop_cmd, tl_se_cmd);
594
595 /* Wake up tcm_loop_issue_tmr(). */
596 complete(&tl_cmd->tmr_done);
597}
598
599static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
600{
601 return;
602}
603
604static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
605{
606 switch (tl_hba->tl_proto_id) {
607 case SCSI_PROTOCOL_SAS:
608 return "SAS";
609 case SCSI_PROTOCOL_FCP:
610 return "FCP";
611 case SCSI_PROTOCOL_ISCSI:
612 return "iSCSI";
613 default:
614 break;
615 }
616
617 return "Unknown";
618}
619
620/* Start items for tcm_loop_port_cit */
621
622static int tcm_loop_port_link(
623 struct se_portal_group *se_tpg,
624 struct se_lun *lun)
625{
626 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
627 struct tcm_loop_tpg, tl_se_tpg);
628 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
629
630 atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
631 /*
632 * Add Linux/SCSI struct scsi_device by HCTL
633 */
634 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
635
636 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
637 return 0;
638}
639
640static void tcm_loop_port_unlink(
641 struct se_portal_group *se_tpg,
642 struct se_lun *se_lun)
643{
644 struct scsi_device *sd;
645 struct tcm_loop_hba *tl_hba;
646 struct tcm_loop_tpg *tl_tpg;
647
648 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
649 tl_hba = tl_tpg->tl_hba;
650
651 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
652 se_lun->unpacked_lun);
653 if (!sd) {
654 pr_err("Unable to locate struct scsi_device for %d:%d:%llu\n",
655 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
656 return;
657 }
658 /*
659 * Remove Linux/SCSI struct scsi_device by HCTL
660 */
661 scsi_remove_device(sd);
662 scsi_device_put(sd);
663
664 atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
665
666 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
667}
668
669/* End items for tcm_loop_port_cit */
670
671static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
672 struct config_item *item, char *page)
673{
674 struct se_portal_group *se_tpg = attrib_to_tpg(item);
675 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
676 tl_se_tpg);
677
678 return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
679}
680
681static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
682 struct config_item *item, const char *page, size_t count)
683{
684 struct se_portal_group *se_tpg = attrib_to_tpg(item);
685 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
686 tl_se_tpg);
687 unsigned long val;
688 int ret = kstrtoul(page, 0, &val);
689
690 if (ret) {
691 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
692 return ret;
693 }
694 if (val != 0 && val != 1 && val != 3) {
695 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
696 return -EINVAL;
697 }
698 tl_tpg->tl_fabric_prot_type = val;
699
700 return count;
701}
702
703CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
704
705static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
706 &tcm_loop_tpg_attrib_attr_fabric_prot_type,
707 NULL,
708};
709
710/* Start items for tcm_loop_nexus_cit */
711
712static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg,
713 struct se_session *se_sess, void *p)
714{
715 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
716 struct tcm_loop_tpg, tl_se_tpg);
717
718 tl_tpg->tl_nexus = p;
719 return 0;
720}
721
722static int tcm_loop_make_nexus(
723 struct tcm_loop_tpg *tl_tpg,
724 const char *name)
725{
726 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
727 struct tcm_loop_nexus *tl_nexus;
728 int ret;
729
730 if (tl_tpg->tl_nexus) {
731 pr_debug("tl_tpg->tl_nexus already exists\n");
732 return -EEXIST;
733 }
734
735 tl_nexus = kzalloc(sizeof(*tl_nexus), GFP_KERNEL);
736 if (!tl_nexus)
737 return -ENOMEM;
738
739 tl_nexus->se_sess = target_setup_session(&tl_tpg->tl_se_tpg, 0, 0,
740 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
741 name, tl_nexus, tcm_loop_alloc_sess_cb);
742 if (IS_ERR(tl_nexus->se_sess)) {
743 ret = PTR_ERR(tl_nexus->se_sess);
744 kfree(tl_nexus);
745 return ret;
746 }
747
748 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated %s Initiator Port: %s\n",
749 tcm_loop_dump_proto_id(tl_hba), name);
750 return 0;
751}
752
753static int tcm_loop_drop_nexus(
754 struct tcm_loop_tpg *tpg)
755{
756 struct se_session *se_sess;
757 struct tcm_loop_nexus *tl_nexus;
758
759 tl_nexus = tpg->tl_nexus;
760 if (!tl_nexus)
761 return -ENODEV;
762
763 se_sess = tl_nexus->se_sess;
764 if (!se_sess)
765 return -ENODEV;
766
767 if (atomic_read(&tpg->tl_tpg_port_count)) {
768 pr_err("Unable to remove TCM_Loop I_T Nexus with active TPG port count: %d\n",
769 atomic_read(&tpg->tl_tpg_port_count));
770 return -EPERM;
771 }
772
773 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
774 tcm_loop_dump_proto_id(tpg->tl_hba),
775 tl_nexus->se_sess->se_node_acl->initiatorname);
776 /*
777 * Release the SCSI I_T Nexus to the emulated Target Port
778 */
779 target_remove_session(se_sess);
780 tpg->tl_nexus = NULL;
781 kfree(tl_nexus);
782 return 0;
783}
784
785/* End items for tcm_loop_nexus_cit */
786
787static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
788{
789 struct se_portal_group *se_tpg = to_tpg(item);
790 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
791 struct tcm_loop_tpg, tl_se_tpg);
792 struct tcm_loop_nexus *tl_nexus;
793 ssize_t ret;
794
795 tl_nexus = tl_tpg->tl_nexus;
796 if (!tl_nexus)
797 return -ENODEV;
798
799 ret = snprintf(page, PAGE_SIZE, "%s\n",
800 tl_nexus->se_sess->se_node_acl->initiatorname);
801
802 return ret;
803}
804
805static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
806 const char *page, size_t count)
807{
808 struct se_portal_group *se_tpg = to_tpg(item);
809 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
810 struct tcm_loop_tpg, tl_se_tpg);
811 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
812 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
813 int ret;
814 /*
815 * Shutdown the active I_T nexus if 'NULL' is passed..
816 */
817 if (!strncmp(page, "NULL", 4)) {
818 ret = tcm_loop_drop_nexus(tl_tpg);
819 return (!ret) ? count : ret;
820 }
821 /*
822 * Otherwise make sure the passed virtual Initiator port WWN matches
823 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
824 * tcm_loop_make_nexus()
825 */
826 if (strlen(page) >= TL_WWN_ADDR_LEN) {
827 pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
828 page, TL_WWN_ADDR_LEN);
829 return -EINVAL;
830 }
831 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
832
833 ptr = strstr(i_port, "naa.");
834 if (ptr) {
835 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
836 pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
837 i_port, tcm_loop_dump_proto_id(tl_hba));
838 return -EINVAL;
839 }
840 port_ptr = &i_port[0];
841 goto check_newline;
842 }
843 ptr = strstr(i_port, "fc.");
844 if (ptr) {
845 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
846 pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
847 i_port, tcm_loop_dump_proto_id(tl_hba));
848 return -EINVAL;
849 }
850 port_ptr = &i_port[3]; /* Skip over "fc." */
851 goto check_newline;
852 }
853 ptr = strstr(i_port, "iqn.");
854 if (ptr) {
855 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
856 pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
857 i_port, tcm_loop_dump_proto_id(tl_hba));
858 return -EINVAL;
859 }
860 port_ptr = &i_port[0];
861 goto check_newline;
862 }
863 pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
864 i_port);
865 return -EINVAL;
866 /*
867 * Clear any trailing newline for the NAA WWN
868 */
869check_newline:
870 if (i_port[strlen(i_port)-1] == '\n')
871 i_port[strlen(i_port)-1] = '\0';
872
873 ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
874 if (ret < 0)
875 return ret;
876
877 return count;
878}
879
880static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
881 char *page)
882{
883 struct se_portal_group *se_tpg = to_tpg(item);
884 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
885 struct tcm_loop_tpg, tl_se_tpg);
886 const char *status = NULL;
887 ssize_t ret = -EINVAL;
888
889 switch (tl_tpg->tl_transport_status) {
890 case TCM_TRANSPORT_ONLINE:
891 status = "online";
892 break;
893 case TCM_TRANSPORT_OFFLINE:
894 status = "offline";
895 break;
896 default:
897 break;
898 }
899
900 if (status)
901 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
902
903 return ret;
904}
905
906static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
907 const char *page, size_t count)
908{
909 struct se_portal_group *se_tpg = to_tpg(item);
910 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
911 struct tcm_loop_tpg, tl_se_tpg);
912
913 if (!strncmp(page, "online", 6)) {
914 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
915 return count;
916 }
917 if (!strncmp(page, "offline", 7)) {
918 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
919 if (tl_tpg->tl_nexus) {
920 struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
921
922 core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
923 }
924 return count;
925 }
926 return -EINVAL;
927}
928
929static ssize_t tcm_loop_tpg_address_show(struct config_item *item,
930 char *page)
931{
932 struct se_portal_group *se_tpg = to_tpg(item);
933 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
934 struct tcm_loop_tpg, tl_se_tpg);
935 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
936
937 return snprintf(page, PAGE_SIZE, "%d:0:%d\n",
938 tl_hba->sh->host_no, tl_tpg->tl_tpgt);
939}
940
941CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
942CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
943CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
944
945static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
946 &tcm_loop_tpg_attr_nexus,
947 &tcm_loop_tpg_attr_transport_status,
948 &tcm_loop_tpg_attr_address,
949 NULL,
950};
951
952/* Start items for tcm_loop_naa_cit */
953
954static struct se_portal_group *tcm_loop_make_naa_tpg(struct se_wwn *wwn,
955 const char *name)
956{
957 struct tcm_loop_hba *tl_hba = container_of(wwn,
958 struct tcm_loop_hba, tl_hba_wwn);
959 struct tcm_loop_tpg *tl_tpg;
960 int ret;
961 unsigned long tpgt;
962
963 if (strstr(name, "tpgt_") != name) {
964 pr_err("Unable to locate \"tpgt_#\" directory group\n");
965 return ERR_PTR(-EINVAL);
966 }
967 if (kstrtoul(name+5, 10, &tpgt))
968 return ERR_PTR(-EINVAL);
969
970 if (tpgt >= TL_TPGS_PER_HBA) {
971 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA: %u\n",
972 tpgt, TL_TPGS_PER_HBA);
973 return ERR_PTR(-EINVAL);
974 }
975 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
976 tl_tpg->tl_hba = tl_hba;
977 tl_tpg->tl_tpgt = tpgt;
978 /*
979 * Register the tl_tpg as a emulated TCM Target Endpoint
980 */
981 ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
982 if (ret < 0)
983 return ERR_PTR(-ENOMEM);
984
985 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s Target Port %s,t,0x%04lx\n",
986 tcm_loop_dump_proto_id(tl_hba),
987 config_item_name(&wwn->wwn_group.cg_item), tpgt);
988 return &tl_tpg->tl_se_tpg;
989}
990
991static void tcm_loop_drop_naa_tpg(
992 struct se_portal_group *se_tpg)
993{
994 struct se_wwn *wwn = se_tpg->se_tpg_wwn;
995 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
996 struct tcm_loop_tpg, tl_se_tpg);
997 struct tcm_loop_hba *tl_hba;
998 unsigned short tpgt;
999
1000 tl_hba = tl_tpg->tl_hba;
1001 tpgt = tl_tpg->tl_tpgt;
1002 /*
1003 * Release the I_T Nexus for the Virtual target link if present
1004 */
1005 tcm_loop_drop_nexus(tl_tpg);
1006 /*
1007 * Deregister the tl_tpg as a emulated TCM Target Endpoint
1008 */
1009 core_tpg_deregister(se_tpg);
1010
1011 tl_tpg->tl_hba = NULL;
1012 tl_tpg->tl_tpgt = 0;
1013
1014 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s Target Port %s,t,0x%04x\n",
1015 tcm_loop_dump_proto_id(tl_hba),
1016 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1017}
1018
1019/* End items for tcm_loop_naa_cit */
1020
1021/* Start items for tcm_loop_cit */
1022
1023static struct se_wwn *tcm_loop_make_scsi_hba(
1024 struct target_fabric_configfs *tf,
1025 struct config_group *group,
1026 const char *name)
1027{
1028 struct tcm_loop_hba *tl_hba;
1029 struct Scsi_Host *sh;
1030 char *ptr;
1031 int ret, off = 0;
1032
1033 tl_hba = kzalloc(sizeof(*tl_hba), GFP_KERNEL);
1034 if (!tl_hba)
1035 return ERR_PTR(-ENOMEM);
1036
1037 /*
1038 * Determine the emulated Protocol Identifier and Target Port Name
1039 * based on the incoming configfs directory name.
1040 */
1041 ptr = strstr(name, "naa.");
1042 if (ptr) {
1043 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1044 goto check_len;
1045 }
1046 ptr = strstr(name, "fc.");
1047 if (ptr) {
1048 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1049 off = 3; /* Skip over "fc." */
1050 goto check_len;
1051 }
1052 ptr = strstr(name, "iqn.");
1053 if (!ptr) {
1054 pr_err("Unable to locate prefix for emulated Target Port: %s\n",
1055 name);
1056 ret = -EINVAL;
1057 goto out;
1058 }
1059 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1060
1061check_len:
1062 if (strlen(name) >= TL_WWN_ADDR_LEN) {
1063 pr_err("Emulated NAA %s Address: %s, exceeds max: %d\n",
1064 name, tcm_loop_dump_proto_id(tl_hba), TL_WWN_ADDR_LEN);
1065 ret = -EINVAL;
1066 goto out;
1067 }
1068 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1069
1070 /*
1071 * Call device_register(tl_hba->dev) to register the emulated
1072 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1073 * device_register() callbacks in tcm_loop_driver_probe()
1074 */
1075 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1076 if (ret)
1077 return ERR_PTR(ret);
1078
1079 sh = tl_hba->sh;
1080 tcm_loop_hba_no_cnt++;
1081 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1082 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1083 return &tl_hba->tl_hba_wwn;
1084out:
1085 kfree(tl_hba);
1086 return ERR_PTR(ret);
1087}
1088
1089static void tcm_loop_drop_scsi_hba(
1090 struct se_wwn *wwn)
1091{
1092 struct tcm_loop_hba *tl_hba = container_of(wwn,
1093 struct tcm_loop_hba, tl_hba_wwn);
1094
1095 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1096 tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
1097 tl_hba->sh->host_no);
1098 /*
1099 * Call device_unregister() on the original tl_hba->dev.
1100 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1101 * release *tl_hba;
1102 */
1103 device_unregister(&tl_hba->dev);
1104}
1105
1106/* Start items for tcm_loop_cit */
1107static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
1108{
1109 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1110}
1111
1112CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
1113
1114static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1115 &tcm_loop_wwn_attr_version,
1116 NULL,
1117};
1118
1119/* End items for tcm_loop_cit */
1120
1121static const struct target_core_fabric_ops loop_ops = {
1122 .module = THIS_MODULE,
1123 .fabric_name = "loopback",
1124 .tpg_get_wwn = tcm_loop_get_endpoint_wwn,
1125 .tpg_get_tag = tcm_loop_get_tag,
1126 .tpg_check_demo_mode = tcm_loop_check_demo_mode,
1127 .tpg_check_demo_mode_cache = tcm_loop_check_demo_mode_cache,
1128 .tpg_check_demo_mode_write_protect =
1129 tcm_loop_check_demo_mode_write_protect,
1130 .tpg_check_prod_mode_write_protect =
1131 tcm_loop_check_prod_mode_write_protect,
1132 .tpg_check_prot_fabric_only = tcm_loop_check_prot_fabric_only,
1133 .tpg_get_inst_index = tcm_loop_get_inst_index,
1134 .check_stop_free = tcm_loop_check_stop_free,
1135 .release_cmd = tcm_loop_release_cmd,
1136 .sess_get_index = tcm_loop_sess_get_index,
1137 .write_pending = tcm_loop_write_pending,
1138 .set_default_node_attributes = tcm_loop_set_default_node_attributes,
1139 .get_cmd_state = tcm_loop_get_cmd_state,
1140 .queue_data_in = tcm_loop_queue_data_in,
1141 .queue_status = tcm_loop_queue_status,
1142 .queue_tm_rsp = tcm_loop_queue_tm_rsp,
1143 .aborted_task = tcm_loop_aborted_task,
1144 .fabric_make_wwn = tcm_loop_make_scsi_hba,
1145 .fabric_drop_wwn = tcm_loop_drop_scsi_hba,
1146 .fabric_make_tpg = tcm_loop_make_naa_tpg,
1147 .fabric_drop_tpg = tcm_loop_drop_naa_tpg,
1148 .fabric_post_link = tcm_loop_port_link,
1149 .fabric_pre_unlink = tcm_loop_port_unlink,
1150 .tfc_wwn_attrs = tcm_loop_wwn_attrs,
1151 .tfc_tpg_base_attrs = tcm_loop_tpg_attrs,
1152 .tfc_tpg_attrib_attrs = tcm_loop_tpg_attrib_attrs,
1153};
1154
1155static int __init tcm_loop_fabric_init(void)
1156{
1157 int ret = -ENOMEM;
1158
1159 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1160 sizeof(struct tcm_loop_cmd),
1161 __alignof__(struct tcm_loop_cmd),
1162 0, NULL);
1163 if (!tcm_loop_cmd_cache) {
1164 pr_debug("kmem_cache_create() for tcm_loop_cmd_cache failed\n");
1165 goto out;
1166 }
1167
1168 ret = tcm_loop_alloc_core_bus();
1169 if (ret)
1170 goto out_destroy_cache;
1171
1172 ret = target_register_template(&loop_ops);
1173 if (ret)
1174 goto out_release_core_bus;
1175
1176 return 0;
1177
1178out_release_core_bus:
1179 tcm_loop_release_core_bus();
1180out_destroy_cache:
1181 kmem_cache_destroy(tcm_loop_cmd_cache);
1182out:
1183 return ret;
1184}
1185
1186static void __exit tcm_loop_fabric_exit(void)
1187{
1188 target_unregister_template(&loop_ops);
1189 tcm_loop_release_core_bus();
1190 kmem_cache_destroy(tcm_loop_cmd_cache);
1191}
1192
1193MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1194MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1195MODULE_LICENSE("GPL");
1196module_init(tcm_loop_fabric_init);
1197module_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 return transport_generic_free_cmd(se_cmd, 0);
55}
56
57static void tcm_loop_release_cmd(struct se_cmd *se_cmd)
58{
59 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
60 struct tcm_loop_cmd, tl_se_cmd);
61
62 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
63}
64
65static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host)
66{
67 seq_puts(m, "tcm_loop_proc_info()\n");
68 return 0;
69}
70
71static int tcm_loop_driver_probe(struct device *);
72static int tcm_loop_driver_remove(struct device *);
73
74static int pseudo_lld_bus_match(struct device *dev,
75 struct device_driver *dev_driver)
76{
77 return 1;
78}
79
80static struct bus_type tcm_loop_lld_bus = {
81 .name = "tcm_loop_bus",
82 .match = pseudo_lld_bus_match,
83 .probe = tcm_loop_driver_probe,
84 .remove = tcm_loop_driver_remove,
85};
86
87static struct device_driver tcm_loop_driverfs = {
88 .name = "tcm_loop",
89 .bus = &tcm_loop_lld_bus,
90};
91/*
92 * Used with root_device_register() in tcm_loop_alloc_core_bus() below
93 */
94static struct device *tcm_loop_primary;
95
96static void tcm_loop_submission_work(struct work_struct *work)
97{
98 struct tcm_loop_cmd *tl_cmd =
99 container_of(work, struct tcm_loop_cmd, work);
100 struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
101 struct scsi_cmnd *sc = tl_cmd->sc;
102 struct tcm_loop_nexus *tl_nexus;
103 struct tcm_loop_hba *tl_hba;
104 struct tcm_loop_tpg *tl_tpg;
105 struct scatterlist *sgl_bidi = NULL;
106 u32 sgl_bidi_count = 0, transfer_length;
107 int rc;
108
109 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
110 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
111
112 /*
113 * Ensure that this tl_tpg reference from the incoming sc->device->id
114 * has already been configured via tcm_loop_make_naa_tpg().
115 */
116 if (!tl_tpg->tl_hba) {
117 set_host_byte(sc, DID_NO_CONNECT);
118 goto out_done;
119 }
120 if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
121 set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
122 goto out_done;
123 }
124 tl_nexus = tl_tpg->tl_nexus;
125 if (!tl_nexus) {
126 scmd_printk(KERN_ERR, sc,
127 "TCM_Loop I_T Nexus does not exist\n");
128 set_host_byte(sc, DID_ERROR);
129 goto out_done;
130 }
131 if (scsi_bidi_cmnd(sc)) {
132 struct scsi_data_buffer *sdb = scsi_in(sc);
133
134 sgl_bidi = sdb->table.sgl;
135 sgl_bidi_count = sdb->table.nents;
136 se_cmd->se_cmd_flags |= SCF_BIDI;
137
138 }
139
140 transfer_length = scsi_transfer_length(sc);
141 if (!scsi_prot_sg_count(sc) &&
142 scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) {
143 se_cmd->prot_pto = true;
144 /*
145 * loopback transport doesn't support
146 * WRITE_GENERATE, READ_STRIP protection
147 * information operations, go ahead unprotected.
148 */
149 transfer_length = scsi_bufflen(sc);
150 }
151
152 se_cmd->tag = tl_cmd->sc_cmd_tag;
153 rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
154 &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
155 transfer_length, TCM_SIMPLE_TAG,
156 sc->sc_data_direction, 0,
157 scsi_sglist(sc), scsi_sg_count(sc),
158 sgl_bidi, sgl_bidi_count,
159 scsi_prot_sglist(sc), scsi_prot_sg_count(sc));
160 if (rc < 0) {
161 set_host_byte(sc, DID_NO_CONNECT);
162 goto out_done;
163 }
164 return;
165
166out_done:
167 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
168 sc->scsi_done(sc);
169}
170
171/*
172 * ->queuecommand can be and usually is called from interrupt context, so
173 * defer the actual submission to a workqueue.
174 */
175static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
176{
177 struct tcm_loop_cmd *tl_cmd;
178
179 pr_debug("%s() %d:%d:%d:%llu got CDB: 0x%02x scsi_buf_len: %u\n",
180 __func__, sc->device->host->host_no, sc->device->id,
181 sc->device->channel, sc->device->lun, sc->cmnd[0],
182 scsi_bufflen(sc));
183
184 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC);
185 if (!tl_cmd) {
186 set_host_byte(sc, DID_ERROR);
187 sc->scsi_done(sc);
188 return 0;
189 }
190
191 tl_cmd->sc = sc;
192 tl_cmd->sc_cmd_tag = sc->request->tag;
193 INIT_WORK(&tl_cmd->work, tcm_loop_submission_work);
194 queue_work(tcm_loop_workqueue, &tl_cmd->work);
195 return 0;
196}
197
198/*
199 * Called from SCSI EH process context to issue a LUN_RESET TMR
200 * to struct scsi_device
201 */
202static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg,
203 u64 lun, int task, enum tcm_tmreq_table tmr)
204{
205 struct se_cmd *se_cmd;
206 struct se_session *se_sess;
207 struct tcm_loop_nexus *tl_nexus;
208 struct tcm_loop_cmd *tl_cmd;
209 int ret = TMR_FUNCTION_FAILED, rc;
210
211 /*
212 * Locate the tl_nexus and se_sess pointers
213 */
214 tl_nexus = tl_tpg->tl_nexus;
215 if (!tl_nexus) {
216 pr_err("Unable to perform device reset without active I_T Nexus\n");
217 return ret;
218 }
219
220 tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL);
221 if (!tl_cmd)
222 return ret;
223
224 init_completion(&tl_cmd->tmr_done);
225
226 se_cmd = &tl_cmd->tl_se_cmd;
227 se_sess = tl_tpg->tl_nexus->se_sess;
228
229 rc = target_submit_tmr(se_cmd, se_sess, tl_cmd->tl_sense_buf, lun,
230 NULL, tmr, GFP_KERNEL, task,
231 TARGET_SCF_ACK_KREF);
232 if (rc < 0)
233 goto release;
234 wait_for_completion(&tl_cmd->tmr_done);
235 ret = se_cmd->se_tmr_req->response;
236 target_put_sess_cmd(se_cmd);
237
238out:
239 return ret;
240
241release:
242 if (se_cmd)
243 transport_generic_free_cmd(se_cmd, 0);
244 else
245 kmem_cache_free(tcm_loop_cmd_cache, tl_cmd);
246 goto out;
247}
248
249static int tcm_loop_abort_task(struct scsi_cmnd *sc)
250{
251 struct tcm_loop_hba *tl_hba;
252 struct tcm_loop_tpg *tl_tpg;
253 int ret = FAILED;
254
255 /*
256 * Locate the tcm_loop_hba_t pointer
257 */
258 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
259 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
260 ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
261 sc->request->tag, TMR_ABORT_TASK);
262 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
263}
264
265/*
266 * Called from SCSI EH process context to issue a LUN_RESET TMR
267 * to struct scsi_device
268 */
269static int tcm_loop_device_reset(struct scsi_cmnd *sc)
270{
271 struct tcm_loop_hba *tl_hba;
272 struct tcm_loop_tpg *tl_tpg;
273 int ret = FAILED;
274
275 /*
276 * Locate the tcm_loop_hba_t pointer
277 */
278 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
279 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
280
281 ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun,
282 0, TMR_LUN_RESET);
283 return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
284}
285
286static int tcm_loop_target_reset(struct scsi_cmnd *sc)
287{
288 struct tcm_loop_hba *tl_hba;
289 struct tcm_loop_tpg *tl_tpg;
290
291 /*
292 * Locate the tcm_loop_hba_t pointer
293 */
294 tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
295 if (!tl_hba) {
296 pr_err("Unable to perform device reset without active I_T Nexus\n");
297 return FAILED;
298 }
299 /*
300 * Locate the tl_tpg pointer from TargetID in sc->device->id
301 */
302 tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
303 if (tl_tpg) {
304 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
305 return SUCCESS;
306 }
307 return FAILED;
308}
309
310static int tcm_loop_slave_alloc(struct scsi_device *sd)
311{
312 blk_queue_flag_set(QUEUE_FLAG_BIDI, sd->request_queue);
313 return 0;
314}
315
316static struct scsi_host_template tcm_loop_driver_template = {
317 .show_info = tcm_loop_show_info,
318 .proc_name = "tcm_loopback",
319 .name = "TCM_Loopback",
320 .queuecommand = tcm_loop_queuecommand,
321 .change_queue_depth = scsi_change_queue_depth,
322 .eh_abort_handler = tcm_loop_abort_task,
323 .eh_device_reset_handler = tcm_loop_device_reset,
324 .eh_target_reset_handler = tcm_loop_target_reset,
325 .can_queue = 1024,
326 .this_id = -1,
327 .sg_tablesize = 256,
328 .cmd_per_lun = 1024,
329 .max_sectors = 0xFFFF,
330 .use_clustering = DISABLE_CLUSTERING,
331 .slave_alloc = tcm_loop_slave_alloc,
332 .module = THIS_MODULE,
333 .track_queue_depth = 1,
334};
335
336static int tcm_loop_driver_probe(struct device *dev)
337{
338 struct tcm_loop_hba *tl_hba;
339 struct Scsi_Host *sh;
340 int error, host_prot;
341
342 tl_hba = to_tcm_loop_hba(dev);
343
344 sh = scsi_host_alloc(&tcm_loop_driver_template,
345 sizeof(struct tcm_loop_hba));
346 if (!sh) {
347 pr_err("Unable to allocate struct scsi_host\n");
348 return -ENODEV;
349 }
350 tl_hba->sh = sh;
351
352 /*
353 * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata
354 */
355 *((struct tcm_loop_hba **)sh->hostdata) = tl_hba;
356 /*
357 * Setup single ID, Channel and LUN for now..
358 */
359 sh->max_id = 2;
360 sh->max_lun = 0;
361 sh->max_channel = 0;
362 sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
363
364 host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION |
365 SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION |
366 SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION;
367
368 scsi_host_set_prot(sh, host_prot);
369 scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC);
370
371 error = scsi_add_host(sh, &tl_hba->dev);
372 if (error) {
373 pr_err("%s: scsi_add_host failed\n", __func__);
374 scsi_host_put(sh);
375 return -ENODEV;
376 }
377 return 0;
378}
379
380static int tcm_loop_driver_remove(struct device *dev)
381{
382 struct tcm_loop_hba *tl_hba;
383 struct Scsi_Host *sh;
384
385 tl_hba = to_tcm_loop_hba(dev);
386 sh = tl_hba->sh;
387
388 scsi_remove_host(sh);
389 scsi_host_put(sh);
390 return 0;
391}
392
393static void tcm_loop_release_adapter(struct device *dev)
394{
395 struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev);
396
397 kfree(tl_hba);
398}
399
400/*
401 * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c
402 */
403static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id)
404{
405 int ret;
406
407 tl_hba->dev.bus = &tcm_loop_lld_bus;
408 tl_hba->dev.parent = tcm_loop_primary;
409 tl_hba->dev.release = &tcm_loop_release_adapter;
410 dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id);
411
412 ret = device_register(&tl_hba->dev);
413 if (ret) {
414 pr_err("device_register() failed for tl_hba->dev: %d\n", ret);
415 return -ENODEV;
416 }
417
418 return 0;
419}
420
421/*
422 * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated
423 * tcm_loop SCSI bus.
424 */
425static int tcm_loop_alloc_core_bus(void)
426{
427 int ret;
428
429 tcm_loop_primary = root_device_register("tcm_loop_0");
430 if (IS_ERR(tcm_loop_primary)) {
431 pr_err("Unable to allocate tcm_loop_primary\n");
432 return PTR_ERR(tcm_loop_primary);
433 }
434
435 ret = bus_register(&tcm_loop_lld_bus);
436 if (ret) {
437 pr_err("bus_register() failed for tcm_loop_lld_bus\n");
438 goto dev_unreg;
439 }
440
441 ret = driver_register(&tcm_loop_driverfs);
442 if (ret) {
443 pr_err("driver_register() failed for tcm_loop_driverfs\n");
444 goto bus_unreg;
445 }
446
447 pr_debug("Initialized TCM Loop Core Bus\n");
448 return ret;
449
450bus_unreg:
451 bus_unregister(&tcm_loop_lld_bus);
452dev_unreg:
453 root_device_unregister(tcm_loop_primary);
454 return ret;
455}
456
457static void tcm_loop_release_core_bus(void)
458{
459 driver_unregister(&tcm_loop_driverfs);
460 bus_unregister(&tcm_loop_lld_bus);
461 root_device_unregister(tcm_loop_primary);
462
463 pr_debug("Releasing TCM Loop Core BUS\n");
464}
465
466static char *tcm_loop_get_fabric_name(void)
467{
468 return "loopback";
469}
470
471static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg)
472{
473 return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
474}
475
476static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg)
477{
478 /*
479 * Return the passed NAA identifier for the Target Port
480 */
481 return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0];
482}
483
484static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg)
485{
486 /*
487 * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83
488 * to represent the SCSI Target Port.
489 */
490 return tl_tpg(se_tpg)->tl_tpgt;
491}
492
493/*
494 * Returning (1) here allows for target_core_mod struct se_node_acl to be generated
495 * based upon the incoming fabric dependent SCSI Initiator Port
496 */
497static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg)
498{
499 return 1;
500}
501
502static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg)
503{
504 return 0;
505}
506
507/*
508 * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for
509 * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest
510 */
511static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg)
512{
513 return 0;
514}
515
516/*
517 * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will
518 * never be called for TCM_Loop by target_core_fabric_configfs.c code.
519 * It has been added here as a nop for target_fabric_tf_ops_check()
520 */
521static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg)
522{
523 return 0;
524}
525
526static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg)
527{
528 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
529 tl_se_tpg);
530 return tl_tpg->tl_fabric_prot_type;
531}
532
533static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg)
534{
535 return 1;
536}
537
538static u32 tcm_loop_sess_get_index(struct se_session *se_sess)
539{
540 return 1;
541}
542
543static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl)
544{
545 return;
546}
547
548static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd)
549{
550 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
551 struct tcm_loop_cmd, tl_se_cmd);
552
553 return tl_cmd->sc_cmd_state;
554}
555
556static int tcm_loop_write_pending(struct se_cmd *se_cmd)
557{
558 /*
559 * Since Linux/SCSI has already sent down a struct scsi_cmnd
560 * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array
561 * memory, and memory has already been mapped to struct se_cmd->t_mem_list
562 * format with transport_generic_map_mem_to_cmd().
563 *
564 * We now tell TCM to add this WRITE CDB directly into the TCM storage
565 * object execution queue.
566 */
567 target_execute_cmd(se_cmd);
568 return 0;
569}
570
571static int tcm_loop_write_pending_status(struct se_cmd *se_cmd)
572{
573 return 0;
574}
575
576static int tcm_loop_queue_data_in(struct se_cmd *se_cmd)
577{
578 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
579 struct tcm_loop_cmd, tl_se_cmd);
580 struct scsi_cmnd *sc = tl_cmd->sc;
581
582 pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
583 __func__, sc, sc->cmnd[0]);
584
585 sc->result = SAM_STAT_GOOD;
586 set_host_byte(sc, DID_OK);
587 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
588 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
589 scsi_set_resid(sc, se_cmd->residual_count);
590 sc->scsi_done(sc);
591 return 0;
592}
593
594static int tcm_loop_queue_status(struct se_cmd *se_cmd)
595{
596 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
597 struct tcm_loop_cmd, tl_se_cmd);
598 struct scsi_cmnd *sc = tl_cmd->sc;
599
600 pr_debug("%s() called for scsi_cmnd: %p cdb: 0x%02x\n",
601 __func__, sc, sc->cmnd[0]);
602
603 if (se_cmd->sense_buffer &&
604 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
605 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
606
607 memcpy(sc->sense_buffer, se_cmd->sense_buffer,
608 SCSI_SENSE_BUFFERSIZE);
609 sc->result = SAM_STAT_CHECK_CONDITION;
610 set_driver_byte(sc, DRIVER_SENSE);
611 } else
612 sc->result = se_cmd->scsi_status;
613
614 set_host_byte(sc, DID_OK);
615 if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) ||
616 (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT))
617 scsi_set_resid(sc, se_cmd->residual_count);
618 sc->scsi_done(sc);
619 return 0;
620}
621
622static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd)
623{
624 struct tcm_loop_cmd *tl_cmd = container_of(se_cmd,
625 struct tcm_loop_cmd, tl_se_cmd);
626
627 /* Wake up tcm_loop_issue_tmr(). */
628 complete(&tl_cmd->tmr_done);
629}
630
631static void tcm_loop_aborted_task(struct se_cmd *se_cmd)
632{
633 return;
634}
635
636static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba)
637{
638 switch (tl_hba->tl_proto_id) {
639 case SCSI_PROTOCOL_SAS:
640 return "SAS";
641 case SCSI_PROTOCOL_FCP:
642 return "FCP";
643 case SCSI_PROTOCOL_ISCSI:
644 return "iSCSI";
645 default:
646 break;
647 }
648
649 return "Unknown";
650}
651
652/* Start items for tcm_loop_port_cit */
653
654static int tcm_loop_port_link(
655 struct se_portal_group *se_tpg,
656 struct se_lun *lun)
657{
658 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
659 struct tcm_loop_tpg, tl_se_tpg);
660 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
661
662 atomic_inc_mb(&tl_tpg->tl_tpg_port_count);
663 /*
664 * Add Linux/SCSI struct scsi_device by HCTL
665 */
666 scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun);
667
668 pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n");
669 return 0;
670}
671
672static void tcm_loop_port_unlink(
673 struct se_portal_group *se_tpg,
674 struct se_lun *se_lun)
675{
676 struct scsi_device *sd;
677 struct tcm_loop_hba *tl_hba;
678 struct tcm_loop_tpg *tl_tpg;
679
680 tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg);
681 tl_hba = tl_tpg->tl_hba;
682
683 sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt,
684 se_lun->unpacked_lun);
685 if (!sd) {
686 pr_err("Unable to locate struct scsi_device for %d:%d:%llu\n",
687 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun);
688 return;
689 }
690 /*
691 * Remove Linux/SCSI struct scsi_device by HCTL
692 */
693 scsi_remove_device(sd);
694 scsi_device_put(sd);
695
696 atomic_dec_mb(&tl_tpg->tl_tpg_port_count);
697
698 pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n");
699}
700
701/* End items for tcm_loop_port_cit */
702
703static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_show(
704 struct config_item *item, char *page)
705{
706 struct se_portal_group *se_tpg = attrib_to_tpg(item);
707 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
708 tl_se_tpg);
709
710 return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type);
711}
712
713static ssize_t tcm_loop_tpg_attrib_fabric_prot_type_store(
714 struct config_item *item, const char *page, size_t count)
715{
716 struct se_portal_group *se_tpg = attrib_to_tpg(item);
717 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg,
718 tl_se_tpg);
719 unsigned long val;
720 int ret = kstrtoul(page, 0, &val);
721
722 if (ret) {
723 pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret);
724 return ret;
725 }
726 if (val != 0 && val != 1 && val != 3) {
727 pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val);
728 return -EINVAL;
729 }
730 tl_tpg->tl_fabric_prot_type = val;
731
732 return count;
733}
734
735CONFIGFS_ATTR(tcm_loop_tpg_attrib_, fabric_prot_type);
736
737static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = {
738 &tcm_loop_tpg_attrib_attr_fabric_prot_type,
739 NULL,
740};
741
742/* Start items for tcm_loop_nexus_cit */
743
744static int tcm_loop_alloc_sess_cb(struct se_portal_group *se_tpg,
745 struct se_session *se_sess, void *p)
746{
747 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
748 struct tcm_loop_tpg, tl_se_tpg);
749
750 tl_tpg->tl_nexus = p;
751 return 0;
752}
753
754static int tcm_loop_make_nexus(
755 struct tcm_loop_tpg *tl_tpg,
756 const char *name)
757{
758 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
759 struct tcm_loop_nexus *tl_nexus;
760 int ret;
761
762 if (tl_tpg->tl_nexus) {
763 pr_debug("tl_tpg->tl_nexus already exists\n");
764 return -EEXIST;
765 }
766
767 tl_nexus = kzalloc(sizeof(*tl_nexus), GFP_KERNEL);
768 if (!tl_nexus)
769 return -ENOMEM;
770
771 tl_nexus->se_sess = target_alloc_session(&tl_tpg->tl_se_tpg, 0, 0,
772 TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS,
773 name, tl_nexus, tcm_loop_alloc_sess_cb);
774 if (IS_ERR(tl_nexus->se_sess)) {
775 ret = PTR_ERR(tl_nexus->se_sess);
776 kfree(tl_nexus);
777 return ret;
778 }
779
780 pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated %s Initiator Port: %s\n",
781 tcm_loop_dump_proto_id(tl_hba), name);
782 return 0;
783}
784
785static int tcm_loop_drop_nexus(
786 struct tcm_loop_tpg *tpg)
787{
788 struct se_session *se_sess;
789 struct tcm_loop_nexus *tl_nexus;
790
791 tl_nexus = tpg->tl_nexus;
792 if (!tl_nexus)
793 return -ENODEV;
794
795 se_sess = tl_nexus->se_sess;
796 if (!se_sess)
797 return -ENODEV;
798
799 if (atomic_read(&tpg->tl_tpg_port_count)) {
800 pr_err("Unable to remove TCM_Loop I_T Nexus with active TPG port count: %d\n",
801 atomic_read(&tpg->tl_tpg_port_count));
802 return -EPERM;
803 }
804
805 pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
806 tcm_loop_dump_proto_id(tpg->tl_hba),
807 tl_nexus->se_sess->se_node_acl->initiatorname);
808 /*
809 * Release the SCSI I_T Nexus to the emulated Target Port
810 */
811 transport_deregister_session(tl_nexus->se_sess);
812 tpg->tl_nexus = NULL;
813 kfree(tl_nexus);
814 return 0;
815}
816
817/* End items for tcm_loop_nexus_cit */
818
819static ssize_t tcm_loop_tpg_nexus_show(struct config_item *item, char *page)
820{
821 struct se_portal_group *se_tpg = to_tpg(item);
822 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
823 struct tcm_loop_tpg, tl_se_tpg);
824 struct tcm_loop_nexus *tl_nexus;
825 ssize_t ret;
826
827 tl_nexus = tl_tpg->tl_nexus;
828 if (!tl_nexus)
829 return -ENODEV;
830
831 ret = snprintf(page, PAGE_SIZE, "%s\n",
832 tl_nexus->se_sess->se_node_acl->initiatorname);
833
834 return ret;
835}
836
837static ssize_t tcm_loop_tpg_nexus_store(struct config_item *item,
838 const char *page, size_t count)
839{
840 struct se_portal_group *se_tpg = to_tpg(item);
841 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
842 struct tcm_loop_tpg, tl_se_tpg);
843 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
844 unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr;
845 int ret;
846 /*
847 * Shutdown the active I_T nexus if 'NULL' is passed..
848 */
849 if (!strncmp(page, "NULL", 4)) {
850 ret = tcm_loop_drop_nexus(tl_tpg);
851 return (!ret) ? count : ret;
852 }
853 /*
854 * Otherwise make sure the passed virtual Initiator port WWN matches
855 * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call
856 * tcm_loop_make_nexus()
857 */
858 if (strlen(page) >= TL_WWN_ADDR_LEN) {
859 pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
860 page, TL_WWN_ADDR_LEN);
861 return -EINVAL;
862 }
863 snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page);
864
865 ptr = strstr(i_port, "naa.");
866 if (ptr) {
867 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) {
868 pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
869 i_port, tcm_loop_dump_proto_id(tl_hba));
870 return -EINVAL;
871 }
872 port_ptr = &i_port[0];
873 goto check_newline;
874 }
875 ptr = strstr(i_port, "fc.");
876 if (ptr) {
877 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) {
878 pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
879 i_port, tcm_loop_dump_proto_id(tl_hba));
880 return -EINVAL;
881 }
882 port_ptr = &i_port[3]; /* Skip over "fc." */
883 goto check_newline;
884 }
885 ptr = strstr(i_port, "iqn.");
886 if (ptr) {
887 if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) {
888 pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
889 i_port, tcm_loop_dump_proto_id(tl_hba));
890 return -EINVAL;
891 }
892 port_ptr = &i_port[0];
893 goto check_newline;
894 }
895 pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
896 i_port);
897 return -EINVAL;
898 /*
899 * Clear any trailing newline for the NAA WWN
900 */
901check_newline:
902 if (i_port[strlen(i_port)-1] == '\n')
903 i_port[strlen(i_port)-1] = '\0';
904
905 ret = tcm_loop_make_nexus(tl_tpg, port_ptr);
906 if (ret < 0)
907 return ret;
908
909 return count;
910}
911
912static ssize_t tcm_loop_tpg_transport_status_show(struct config_item *item,
913 char *page)
914{
915 struct se_portal_group *se_tpg = to_tpg(item);
916 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
917 struct tcm_loop_tpg, tl_se_tpg);
918 const char *status = NULL;
919 ssize_t ret = -EINVAL;
920
921 switch (tl_tpg->tl_transport_status) {
922 case TCM_TRANSPORT_ONLINE:
923 status = "online";
924 break;
925 case TCM_TRANSPORT_OFFLINE:
926 status = "offline";
927 break;
928 default:
929 break;
930 }
931
932 if (status)
933 ret = snprintf(page, PAGE_SIZE, "%s\n", status);
934
935 return ret;
936}
937
938static ssize_t tcm_loop_tpg_transport_status_store(struct config_item *item,
939 const char *page, size_t count)
940{
941 struct se_portal_group *se_tpg = to_tpg(item);
942 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
943 struct tcm_loop_tpg, tl_se_tpg);
944
945 if (!strncmp(page, "online", 6)) {
946 tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE;
947 return count;
948 }
949 if (!strncmp(page, "offline", 7)) {
950 tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE;
951 if (tl_tpg->tl_nexus) {
952 struct se_session *tl_sess = tl_tpg->tl_nexus->se_sess;
953
954 core_allocate_nexus_loss_ua(tl_sess->se_node_acl);
955 }
956 return count;
957 }
958 return -EINVAL;
959}
960
961static ssize_t tcm_loop_tpg_address_show(struct config_item *item,
962 char *page)
963{
964 struct se_portal_group *se_tpg = to_tpg(item);
965 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
966 struct tcm_loop_tpg, tl_se_tpg);
967 struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba;
968
969 return snprintf(page, PAGE_SIZE, "%d:0:%d\n",
970 tl_hba->sh->host_no, tl_tpg->tl_tpgt);
971}
972
973CONFIGFS_ATTR(tcm_loop_tpg_, nexus);
974CONFIGFS_ATTR(tcm_loop_tpg_, transport_status);
975CONFIGFS_ATTR_RO(tcm_loop_tpg_, address);
976
977static struct configfs_attribute *tcm_loop_tpg_attrs[] = {
978 &tcm_loop_tpg_attr_nexus,
979 &tcm_loop_tpg_attr_transport_status,
980 &tcm_loop_tpg_attr_address,
981 NULL,
982};
983
984/* Start items for tcm_loop_naa_cit */
985
986static struct se_portal_group *tcm_loop_make_naa_tpg(
987 struct se_wwn *wwn,
988 struct config_group *group,
989 const char *name)
990{
991 struct tcm_loop_hba *tl_hba = container_of(wwn,
992 struct tcm_loop_hba, tl_hba_wwn);
993 struct tcm_loop_tpg *tl_tpg;
994 int ret;
995 unsigned long tpgt;
996
997 if (strstr(name, "tpgt_") != name) {
998 pr_err("Unable to locate \"tpgt_#\" directory group\n");
999 return ERR_PTR(-EINVAL);
1000 }
1001 if (kstrtoul(name+5, 10, &tpgt))
1002 return ERR_PTR(-EINVAL);
1003
1004 if (tpgt >= TL_TPGS_PER_HBA) {
1005 pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA: %u\n",
1006 tpgt, TL_TPGS_PER_HBA);
1007 return ERR_PTR(-EINVAL);
1008 }
1009 tl_tpg = &tl_hba->tl_hba_tpgs[tpgt];
1010 tl_tpg->tl_hba = tl_hba;
1011 tl_tpg->tl_tpgt = tpgt;
1012 /*
1013 * Register the tl_tpg as a emulated TCM Target Endpoint
1014 */
1015 ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id);
1016 if (ret < 0)
1017 return ERR_PTR(-ENOMEM);
1018
1019 pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s Target Port %s,t,0x%04lx\n",
1020 tcm_loop_dump_proto_id(tl_hba),
1021 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1022 return &tl_tpg->tl_se_tpg;
1023}
1024
1025static void tcm_loop_drop_naa_tpg(
1026 struct se_portal_group *se_tpg)
1027{
1028 struct se_wwn *wwn = se_tpg->se_tpg_wwn;
1029 struct tcm_loop_tpg *tl_tpg = container_of(se_tpg,
1030 struct tcm_loop_tpg, tl_se_tpg);
1031 struct tcm_loop_hba *tl_hba;
1032 unsigned short tpgt;
1033
1034 tl_hba = tl_tpg->tl_hba;
1035 tpgt = tl_tpg->tl_tpgt;
1036 /*
1037 * Release the I_T Nexus for the Virtual target link if present
1038 */
1039 tcm_loop_drop_nexus(tl_tpg);
1040 /*
1041 * Deregister the tl_tpg as a emulated TCM Target Endpoint
1042 */
1043 core_tpg_deregister(se_tpg);
1044
1045 tl_tpg->tl_hba = NULL;
1046 tl_tpg->tl_tpgt = 0;
1047
1048 pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s Target Port %s,t,0x%04x\n",
1049 tcm_loop_dump_proto_id(tl_hba),
1050 config_item_name(&wwn->wwn_group.cg_item), tpgt);
1051}
1052
1053/* End items for tcm_loop_naa_cit */
1054
1055/* Start items for tcm_loop_cit */
1056
1057static struct se_wwn *tcm_loop_make_scsi_hba(
1058 struct target_fabric_configfs *tf,
1059 struct config_group *group,
1060 const char *name)
1061{
1062 struct tcm_loop_hba *tl_hba;
1063 struct Scsi_Host *sh;
1064 char *ptr;
1065 int ret, off = 0;
1066
1067 tl_hba = kzalloc(sizeof(*tl_hba), GFP_KERNEL);
1068 if (!tl_hba)
1069 return ERR_PTR(-ENOMEM);
1070
1071 /*
1072 * Determine the emulated Protocol Identifier and Target Port Name
1073 * based on the incoming configfs directory name.
1074 */
1075 ptr = strstr(name, "naa.");
1076 if (ptr) {
1077 tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS;
1078 goto check_len;
1079 }
1080 ptr = strstr(name, "fc.");
1081 if (ptr) {
1082 tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP;
1083 off = 3; /* Skip over "fc." */
1084 goto check_len;
1085 }
1086 ptr = strstr(name, "iqn.");
1087 if (!ptr) {
1088 pr_err("Unable to locate prefix for emulated Target Port: %s\n",
1089 name);
1090 ret = -EINVAL;
1091 goto out;
1092 }
1093 tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI;
1094
1095check_len:
1096 if (strlen(name) >= TL_WWN_ADDR_LEN) {
1097 pr_err("Emulated NAA %s Address: %s, exceeds max: %d\n",
1098 name, tcm_loop_dump_proto_id(tl_hba), TL_WWN_ADDR_LEN);
1099 ret = -EINVAL;
1100 goto out;
1101 }
1102 snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]);
1103
1104 /*
1105 * Call device_register(tl_hba->dev) to register the emulated
1106 * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after
1107 * device_register() callbacks in tcm_loop_driver_probe()
1108 */
1109 ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt);
1110 if (ret)
1111 goto out;
1112
1113 sh = tl_hba->sh;
1114 tcm_loop_hba_no_cnt++;
1115 pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1116 tcm_loop_dump_proto_id(tl_hba), name, sh->host_no);
1117 return &tl_hba->tl_hba_wwn;
1118out:
1119 kfree(tl_hba);
1120 return ERR_PTR(ret);
1121}
1122
1123static void tcm_loop_drop_scsi_hba(
1124 struct se_wwn *wwn)
1125{
1126 struct tcm_loop_hba *tl_hba = container_of(wwn,
1127 struct tcm_loop_hba, tl_hba_wwn);
1128
1129 pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target %s Address: %s at Linux/SCSI Host ID: %d\n",
1130 tcm_loop_dump_proto_id(tl_hba), tl_hba->tl_wwn_address,
1131 tl_hba->sh->host_no);
1132 /*
1133 * Call device_unregister() on the original tl_hba->dev.
1134 * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will
1135 * release *tl_hba;
1136 */
1137 device_unregister(&tl_hba->dev);
1138}
1139
1140/* Start items for tcm_loop_cit */
1141static ssize_t tcm_loop_wwn_version_show(struct config_item *item, char *page)
1142{
1143 return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION);
1144}
1145
1146CONFIGFS_ATTR_RO(tcm_loop_wwn_, version);
1147
1148static struct configfs_attribute *tcm_loop_wwn_attrs[] = {
1149 &tcm_loop_wwn_attr_version,
1150 NULL,
1151};
1152
1153/* End items for tcm_loop_cit */
1154
1155static const struct target_core_fabric_ops loop_ops = {
1156 .module = THIS_MODULE,
1157 .name = "loopback",
1158 .get_fabric_name = tcm_loop_get_fabric_name,
1159 .tpg_get_wwn = tcm_loop_get_endpoint_wwn,
1160 .tpg_get_tag = tcm_loop_get_tag,
1161 .tpg_check_demo_mode = tcm_loop_check_demo_mode,
1162 .tpg_check_demo_mode_cache = tcm_loop_check_demo_mode_cache,
1163 .tpg_check_demo_mode_write_protect =
1164 tcm_loop_check_demo_mode_write_protect,
1165 .tpg_check_prod_mode_write_protect =
1166 tcm_loop_check_prod_mode_write_protect,
1167 .tpg_check_prot_fabric_only = tcm_loop_check_prot_fabric_only,
1168 .tpg_get_inst_index = tcm_loop_get_inst_index,
1169 .check_stop_free = tcm_loop_check_stop_free,
1170 .release_cmd = tcm_loop_release_cmd,
1171 .sess_get_index = tcm_loop_sess_get_index,
1172 .write_pending = tcm_loop_write_pending,
1173 .write_pending_status = tcm_loop_write_pending_status,
1174 .set_default_node_attributes = tcm_loop_set_default_node_attributes,
1175 .get_cmd_state = tcm_loop_get_cmd_state,
1176 .queue_data_in = tcm_loop_queue_data_in,
1177 .queue_status = tcm_loop_queue_status,
1178 .queue_tm_rsp = tcm_loop_queue_tm_rsp,
1179 .aborted_task = tcm_loop_aborted_task,
1180 .fabric_make_wwn = tcm_loop_make_scsi_hba,
1181 .fabric_drop_wwn = tcm_loop_drop_scsi_hba,
1182 .fabric_make_tpg = tcm_loop_make_naa_tpg,
1183 .fabric_drop_tpg = tcm_loop_drop_naa_tpg,
1184 .fabric_post_link = tcm_loop_port_link,
1185 .fabric_pre_unlink = tcm_loop_port_unlink,
1186 .tfc_wwn_attrs = tcm_loop_wwn_attrs,
1187 .tfc_tpg_base_attrs = tcm_loop_tpg_attrs,
1188 .tfc_tpg_attrib_attrs = tcm_loop_tpg_attrib_attrs,
1189};
1190
1191static int __init tcm_loop_fabric_init(void)
1192{
1193 int ret = -ENOMEM;
1194
1195 tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0);
1196 if (!tcm_loop_workqueue)
1197 goto out;
1198
1199 tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache",
1200 sizeof(struct tcm_loop_cmd),
1201 __alignof__(struct tcm_loop_cmd),
1202 0, NULL);
1203 if (!tcm_loop_cmd_cache) {
1204 pr_debug("kmem_cache_create() for tcm_loop_cmd_cache failed\n");
1205 goto out_destroy_workqueue;
1206 }
1207
1208 ret = tcm_loop_alloc_core_bus();
1209 if (ret)
1210 goto out_destroy_cache;
1211
1212 ret = target_register_template(&loop_ops);
1213 if (ret)
1214 goto out_release_core_bus;
1215
1216 return 0;
1217
1218out_release_core_bus:
1219 tcm_loop_release_core_bus();
1220out_destroy_cache:
1221 kmem_cache_destroy(tcm_loop_cmd_cache);
1222out_destroy_workqueue:
1223 destroy_workqueue(tcm_loop_workqueue);
1224out:
1225 return ret;
1226}
1227
1228static void __exit tcm_loop_fabric_exit(void)
1229{
1230 target_unregister_template(&loop_ops);
1231 tcm_loop_release_core_bus();
1232 kmem_cache_destroy(tcm_loop_cmd_cache);
1233 destroy_workqueue(tcm_loop_workqueue);
1234}
1235
1236MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module");
1237MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>");
1238MODULE_LICENSE("GPL");
1239module_init(tcm_loop_fabric_init);
1240module_exit(tcm_loop_fabric_exit);