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3703b2c5 NB |
1 | /******************************************************************************* |
2 | * | |
3 | * This file contains the Linux/SCSI LLD virtual SCSI initiator driver | |
4 | * for emulated SAS initiator ports | |
5 | * | |
6 | * © Copyright 2011 RisingTide Systems LLC. | |
7 | * | |
8 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
9 | * | |
10 | * Author: Nicholas A. Bellinger <nab@risingtidesystems.com> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | ****************************************************************************/ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/moduleparam.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/configfs.h> | |
29 | #include <scsi/scsi.h> | |
30 | #include <scsi/scsi_tcq.h> | |
31 | #include <scsi/scsi_host.h> | |
32 | #include <scsi/scsi_device.h> | |
33 | #include <scsi/scsi_cmnd.h> | |
3703b2c5 NB |
34 | |
35 | #include <target/target_core_base.h> | |
c4795fb2 | 36 | #include <target/target_core_fabric.h> |
3703b2c5 | 37 | #include <target/target_core_fabric_configfs.h> |
3703b2c5 | 38 | #include <target/target_core_configfs.h> |
3703b2c5 NB |
39 | |
40 | #include "tcm_loop.h" | |
41 | ||
42 | #define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev) | |
43 | ||
44 | /* Local pointer to allocated TCM configfs fabric module */ | |
45 | static struct target_fabric_configfs *tcm_loop_fabric_configfs; | |
46 | ||
afe2cb7f | 47 | static struct workqueue_struct *tcm_loop_workqueue; |
3703b2c5 NB |
48 | static struct kmem_cache *tcm_loop_cmd_cache; |
49 | ||
50 | static int tcm_loop_hba_no_cnt; | |
51 | ||
16786454 | 52 | static int tcm_loop_queue_status(struct se_cmd *se_cmd); |
3703b2c5 NB |
53 | |
54 | /* | |
55 | * Called from struct target_core_fabric_ops->check_stop_free() | |
56 | */ | |
88dd9e26 | 57 | static int tcm_loop_check_stop_free(struct se_cmd *se_cmd) |
3703b2c5 NB |
58 | { |
59 | /* | |
60 | * Do not release struct se_cmd's containing a valid TMR | |
61 | * pointer. These will be released directly in tcm_loop_device_reset() | |
62 | * with transport_generic_free_cmd(). | |
63 | */ | |
c8e31f26 | 64 | if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) |
88dd9e26 | 65 | return 0; |
3703b2c5 NB |
66 | /* |
67 | * Release the struct se_cmd, which will make a callback to release | |
68 | * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd() | |
69 | */ | |
82f1c8a4 | 70 | transport_generic_free_cmd(se_cmd, 0); |
88dd9e26 | 71 | return 1; |
3703b2c5 NB |
72 | } |
73 | ||
35462975 | 74 | static void tcm_loop_release_cmd(struct se_cmd *se_cmd) |
3703b2c5 NB |
75 | { |
76 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
77 | struct tcm_loop_cmd, tl_se_cmd); | |
78 | ||
79 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); | |
80 | } | |
81 | ||
82 | static int tcm_loop_proc_info(struct Scsi_Host *host, char *buffer, | |
83 | char **start, off_t offset, | |
84 | int length, int inout) | |
85 | { | |
86 | return sprintf(buffer, "tcm_loop_proc_info()\n"); | |
87 | } | |
88 | ||
89 | static int tcm_loop_driver_probe(struct device *); | |
90 | static int tcm_loop_driver_remove(struct device *); | |
91 | ||
92 | static int pseudo_lld_bus_match(struct device *dev, | |
93 | struct device_driver *dev_driver) | |
94 | { | |
95 | return 1; | |
96 | } | |
97 | ||
98 | static struct bus_type tcm_loop_lld_bus = { | |
99 | .name = "tcm_loop_bus", | |
100 | .match = pseudo_lld_bus_match, | |
101 | .probe = tcm_loop_driver_probe, | |
102 | .remove = tcm_loop_driver_remove, | |
103 | }; | |
104 | ||
105 | static struct device_driver tcm_loop_driverfs = { | |
106 | .name = "tcm_loop", | |
107 | .bus = &tcm_loop_lld_bus, | |
108 | }; | |
109 | /* | |
110 | * Used with root_device_register() in tcm_loop_alloc_core_bus() below | |
111 | */ | |
112 | struct device *tcm_loop_primary; | |
113 | ||
114 | /* | |
115 | * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and | |
116 | * drivers/scsi/libiscsi.c:iscsi_change_queue_depth() | |
117 | */ | |
118 | static int tcm_loop_change_queue_depth( | |
119 | struct scsi_device *sdev, | |
120 | int depth, | |
121 | int reason) | |
122 | { | |
123 | switch (reason) { | |
124 | case SCSI_QDEPTH_DEFAULT: | |
125 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
126 | break; | |
127 | case SCSI_QDEPTH_QFULL: | |
128 | scsi_track_queue_full(sdev, depth); | |
129 | break; | |
130 | case SCSI_QDEPTH_RAMP_UP: | |
131 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
132 | break; | |
133 | default: | |
134 | return -EOPNOTSUPP; | |
135 | } | |
136 | return sdev->queue_depth; | |
137 | } | |
138 | ||
f872c9f4 CH |
139 | /* |
140 | * Locate the SAM Task Attr from struct scsi_cmnd * | |
141 | */ | |
142 | static int tcm_loop_sam_attr(struct scsi_cmnd *sc) | |
143 | { | |
144 | if (sc->device->tagged_supported) { | |
145 | switch (sc->tag) { | |
146 | case HEAD_OF_QUEUE_TAG: | |
147 | return MSG_HEAD_TAG; | |
148 | case ORDERED_QUEUE_TAG: | |
149 | return MSG_ORDERED_TAG; | |
150 | default: | |
151 | break; | |
152 | } | |
153 | } | |
154 | ||
155 | return MSG_SIMPLE_TAG; | |
156 | } | |
157 | ||
afe2cb7f | 158 | static void tcm_loop_submission_work(struct work_struct *work) |
3703b2c5 | 159 | { |
afe2cb7f CH |
160 | struct tcm_loop_cmd *tl_cmd = |
161 | container_of(work, struct tcm_loop_cmd, work); | |
162 | struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd; | |
163 | struct scsi_cmnd *sc = tl_cmd->sc; | |
164 | struct tcm_loop_nexus *tl_nexus; | |
3703b2c5 NB |
165 | struct tcm_loop_hba *tl_hba; |
166 | struct tcm_loop_tpg *tl_tpg; | |
16786454 CH |
167 | struct scatterlist *sgl_bidi = NULL; |
168 | u32 sgl_bidi_count = 0; | |
169 | int ret; | |
3703b2c5 | 170 | |
3703b2c5 NB |
171 | tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); |
172 | tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; | |
afe2cb7f | 173 | |
0a020436 NB |
174 | /* |
175 | * Ensure that this tl_tpg reference from the incoming sc->device->id | |
176 | * has already been configured via tcm_loop_make_naa_tpg(). | |
177 | */ | |
178 | if (!tl_tpg->tl_hba) { | |
179 | set_host_byte(sc, DID_NO_CONNECT); | |
f872c9f4 | 180 | goto out_done; |
0a020436 | 181 | } |
f872c9f4 CH |
182 | |
183 | tl_nexus = tl_hba->tl_nexus; | |
184 | if (!tl_nexus) { | |
185 | scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus" | |
186 | " does not exist\n"); | |
187 | set_host_byte(sc, DID_ERROR); | |
188 | goto out_done; | |
3703b2c5 | 189 | } |
f872c9f4 | 190 | |
afe2cb7f CH |
191 | transport_init_se_cmd(se_cmd, tl_tpg->tl_se_tpg.se_tpg_tfo, |
192 | tl_nexus->se_sess, | |
f872c9f4 CH |
193 | scsi_bufflen(sc), sc->sc_data_direction, |
194 | tcm_loop_sam_attr(sc), &tl_cmd->tl_sense_buf[0]); | |
195 | ||
16786454 CH |
196 | if (scsi_bidi_cmnd(sc)) { |
197 | struct scsi_data_buffer *sdb = scsi_in(sc); | |
198 | ||
199 | sgl_bidi = sdb->table.sgl; | |
200 | sgl_bidi_count = sdb->table.nents; | |
f872c9f4 CH |
201 | se_cmd->se_cmd_flags |= SCF_BIDI; |
202 | ||
16786454 CH |
203 | } |
204 | ||
f872c9f4 CH |
205 | if (transport_lookup_cmd_lun(se_cmd, tl_cmd->sc->device->lun) < 0) { |
206 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); | |
207 | set_host_byte(sc, DID_NO_CONNECT); | |
208 | goto out_done; | |
209 | } | |
210 | ||
16786454 CH |
211 | /* |
212 | * Because some userspace code via scsi-generic do not memset their | |
213 | * associated read buffers, go ahead and do that here for type | |
64f1db38 CH |
214 | * non-data CDBs. Also note that this is currently guaranteed to be a |
215 | * single SGL for this case by target core in | |
216 | * target_setup_cmd_from_cdb() -> transport_generic_cmd_sequencer(). | |
16786454 | 217 | */ |
64f1db38 | 218 | if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) && |
16786454 CH |
219 | se_cmd->data_direction == DMA_FROM_DEVICE) { |
220 | struct scatterlist *sg = scsi_sglist(sc); | |
221 | unsigned char *buf = kmap(sg_page(sg)) + sg->offset; | |
222 | ||
223 | if (buf != NULL) { | |
224 | memset(buf, 0, sg->length); | |
225 | kunmap(sg_page(sg)); | |
226 | } | |
227 | } | |
228 | ||
a12f41f8 | 229 | ret = target_setup_cmd_from_cdb(se_cmd, sc->cmnd); |
16786454 CH |
230 | if (ret == -ENOMEM) { |
231 | transport_send_check_condition_and_sense(se_cmd, | |
232 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); | |
233 | transport_generic_free_cmd(se_cmd, 0); | |
234 | return; | |
ee9b866a | 235 | } else if (ret < 0) { |
16786454 CH |
236 | if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT) |
237 | tcm_loop_queue_status(se_cmd); | |
238 | else | |
239 | transport_send_check_condition_and_sense(se_cmd, | |
240 | se_cmd->scsi_sense_reason, 0); | |
241 | transport_generic_free_cmd(se_cmd, 0); | |
242 | return; | |
243 | } | |
244 | ||
245 | ret = transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc), | |
246 | scsi_sg_count(sc), sgl_bidi, sgl_bidi_count); | |
247 | if (ret) { | |
248 | transport_send_check_condition_and_sense(se_cmd, | |
249 | se_cmd->scsi_sense_reason, 0); | |
250 | transport_generic_free_cmd(se_cmd, 0); | |
251 | return; | |
252 | } | |
253 | transport_handle_cdb_direct(se_cmd); | |
afe2cb7f | 254 | return; |
f872c9f4 CH |
255 | |
256 | out_done: | |
257 | sc->scsi_done(sc); | |
afe2cb7f CH |
258 | return; |
259 | } | |
260 | ||
261 | /* | |
262 | * ->queuecommand can be and usually is called from interrupt context, so | |
263 | * defer the actual submission to a workqueue. | |
264 | */ | |
265 | static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc) | |
266 | { | |
267 | struct tcm_loop_cmd *tl_cmd; | |
268 | ||
269 | pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x" | |
270 | " scsi_buf_len: %u\n", sc->device->host->host_no, | |
271 | sc->device->id, sc->device->channel, sc->device->lun, | |
272 | sc->cmnd[0], scsi_bufflen(sc)); | |
273 | ||
274 | tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC); | |
275 | if (!tl_cmd) { | |
276 | pr_err("Unable to allocate struct tcm_loop_cmd\n"); | |
277 | set_host_byte(sc, DID_ERROR); | |
278 | sc->scsi_done(sc); | |
279 | return 0; | |
280 | } | |
281 | ||
282 | tl_cmd->sc = sc; | |
283 | INIT_WORK(&tl_cmd->work, tcm_loop_submission_work); | |
284 | queue_work(tcm_loop_workqueue, &tl_cmd->work); | |
f872c9f4 | 285 | return 0; |
3703b2c5 NB |
286 | } |
287 | ||
288 | /* | |
289 | * Called from SCSI EH process context to issue a LUN_RESET TMR | |
290 | * to struct scsi_device | |
291 | */ | |
292 | static int tcm_loop_device_reset(struct scsi_cmnd *sc) | |
293 | { | |
294 | struct se_cmd *se_cmd = NULL; | |
295 | struct se_portal_group *se_tpg; | |
296 | struct se_session *se_sess; | |
297 | struct tcm_loop_cmd *tl_cmd = NULL; | |
298 | struct tcm_loop_hba *tl_hba; | |
299 | struct tcm_loop_nexus *tl_nexus; | |
300 | struct tcm_loop_tmr *tl_tmr = NULL; | |
301 | struct tcm_loop_tpg *tl_tpg; | |
c8e31f26 | 302 | int ret = FAILED, rc; |
3703b2c5 NB |
303 | /* |
304 | * Locate the tcm_loop_hba_t pointer | |
305 | */ | |
306 | tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); | |
307 | /* | |
308 | * Locate the tl_nexus and se_sess pointers | |
309 | */ | |
310 | tl_nexus = tl_hba->tl_nexus; | |
311 | if (!tl_nexus) { | |
6708bb27 | 312 | pr_err("Unable to perform device reset without" |
3703b2c5 NB |
313 | " active I_T Nexus\n"); |
314 | return FAILED; | |
315 | } | |
316 | se_sess = tl_nexus->se_sess; | |
317 | /* | |
318 | * Locate the tl_tpg and se_tpg pointers from TargetID in sc->device->id | |
319 | */ | |
320 | tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; | |
321 | se_tpg = &tl_tpg->tl_se_tpg; | |
322 | ||
323 | tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); | |
324 | if (!tl_cmd) { | |
6708bb27 | 325 | pr_err("Unable to allocate memory for tl_cmd\n"); |
3703b2c5 NB |
326 | return FAILED; |
327 | } | |
328 | ||
329 | tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL); | |
330 | if (!tl_tmr) { | |
6708bb27 | 331 | pr_err("Unable to allocate memory for tl_tmr\n"); |
3703b2c5 NB |
332 | goto release; |
333 | } | |
334 | init_waitqueue_head(&tl_tmr->tl_tmr_wait); | |
335 | ||
336 | se_cmd = &tl_cmd->tl_se_cmd; | |
337 | /* | |
338 | * Initialize struct se_cmd descriptor from target_core_mod infrastructure | |
339 | */ | |
340 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0, | |
61db1802 | 341 | DMA_NONE, MSG_SIMPLE_TAG, |
3703b2c5 | 342 | &tl_cmd->tl_sense_buf[0]); |
c8e31f26 AG |
343 | |
344 | rc = core_tmr_alloc_req(se_cmd, tl_tmr, TMR_LUN_RESET, GFP_KERNEL); | |
345 | if (rc < 0) | |
3703b2c5 NB |
346 | goto release; |
347 | /* | |
348 | * Locate the underlying TCM struct se_lun from sc->device->lun | |
349 | */ | |
5951146d | 350 | if (transport_lookup_tmr_lun(se_cmd, sc->device->lun) < 0) |
3703b2c5 NB |
351 | goto release; |
352 | /* | |
353 | * Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp() | |
354 | * to wake us up. | |
355 | */ | |
356 | transport_generic_handle_tmr(se_cmd); | |
357 | wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete)); | |
358 | /* | |
359 | * The TMR LUN_RESET has completed, check the response status and | |
360 | * then release allocations. | |
361 | */ | |
362 | ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? | |
363 | SUCCESS : FAILED; | |
364 | release: | |
365 | if (se_cmd) | |
82f1c8a4 | 366 | transport_generic_free_cmd(se_cmd, 1); |
3703b2c5 NB |
367 | else |
368 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); | |
369 | kfree(tl_tmr); | |
370 | return ret; | |
371 | } | |
372 | ||
373 | static int tcm_loop_slave_alloc(struct scsi_device *sd) | |
374 | { | |
375 | set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags); | |
376 | return 0; | |
377 | } | |
378 | ||
379 | static int tcm_loop_slave_configure(struct scsi_device *sd) | |
380 | { | |
381 | return 0; | |
382 | } | |
383 | ||
384 | static struct scsi_host_template tcm_loop_driver_template = { | |
385 | .proc_info = tcm_loop_proc_info, | |
386 | .proc_name = "tcm_loopback", | |
387 | .name = "TCM_Loopback", | |
388 | .queuecommand = tcm_loop_queuecommand, | |
389 | .change_queue_depth = tcm_loop_change_queue_depth, | |
390 | .eh_device_reset_handler = tcm_loop_device_reset, | |
2e88efd3 | 391 | .can_queue = 1024, |
3703b2c5 | 392 | .this_id = -1, |
2e88efd3 CH |
393 | .sg_tablesize = 256, |
394 | .cmd_per_lun = 1024, | |
395 | .max_sectors = 0xFFFF, | |
3703b2c5 NB |
396 | .use_clustering = DISABLE_CLUSTERING, |
397 | .slave_alloc = tcm_loop_slave_alloc, | |
398 | .slave_configure = tcm_loop_slave_configure, | |
399 | .module = THIS_MODULE, | |
400 | }; | |
401 | ||
402 | static int tcm_loop_driver_probe(struct device *dev) | |
403 | { | |
404 | struct tcm_loop_hba *tl_hba; | |
405 | struct Scsi_Host *sh; | |
406 | int error; | |
407 | ||
408 | tl_hba = to_tcm_loop_hba(dev); | |
409 | ||
410 | sh = scsi_host_alloc(&tcm_loop_driver_template, | |
411 | sizeof(struct tcm_loop_hba)); | |
412 | if (!sh) { | |
6708bb27 | 413 | pr_err("Unable to allocate struct scsi_host\n"); |
3703b2c5 NB |
414 | return -ENODEV; |
415 | } | |
416 | tl_hba->sh = sh; | |
417 | ||
418 | /* | |
419 | * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata | |
420 | */ | |
421 | *((struct tcm_loop_hba **)sh->hostdata) = tl_hba; | |
422 | /* | |
423 | * Setup single ID, Channel and LUN for now.. | |
424 | */ | |
425 | sh->max_id = 2; | |
426 | sh->max_lun = 0; | |
427 | sh->max_channel = 0; | |
428 | sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN; | |
429 | ||
430 | error = scsi_add_host(sh, &tl_hba->dev); | |
431 | if (error) { | |
6708bb27 | 432 | pr_err("%s: scsi_add_host failed\n", __func__); |
3703b2c5 NB |
433 | scsi_host_put(sh); |
434 | return -ENODEV; | |
435 | } | |
436 | return 0; | |
437 | } | |
438 | ||
439 | static int tcm_loop_driver_remove(struct device *dev) | |
440 | { | |
441 | struct tcm_loop_hba *tl_hba; | |
442 | struct Scsi_Host *sh; | |
443 | ||
444 | tl_hba = to_tcm_loop_hba(dev); | |
445 | sh = tl_hba->sh; | |
446 | ||
447 | scsi_remove_host(sh); | |
448 | scsi_host_put(sh); | |
449 | return 0; | |
450 | } | |
451 | ||
452 | static void tcm_loop_release_adapter(struct device *dev) | |
453 | { | |
454 | struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev); | |
455 | ||
456 | kfree(tl_hba); | |
457 | } | |
458 | ||
459 | /* | |
460 | * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c | |
461 | */ | |
462 | static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id) | |
463 | { | |
464 | int ret; | |
465 | ||
466 | tl_hba->dev.bus = &tcm_loop_lld_bus; | |
467 | tl_hba->dev.parent = tcm_loop_primary; | |
468 | tl_hba->dev.release = &tcm_loop_release_adapter; | |
469 | dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id); | |
470 | ||
471 | ret = device_register(&tl_hba->dev); | |
472 | if (ret) { | |
6708bb27 | 473 | pr_err("device_register() failed for" |
3703b2c5 NB |
474 | " tl_hba->dev: %d\n", ret); |
475 | return -ENODEV; | |
476 | } | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
481 | /* | |
482 | * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated | |
483 | * tcm_loop SCSI bus. | |
484 | */ | |
485 | static int tcm_loop_alloc_core_bus(void) | |
486 | { | |
487 | int ret; | |
488 | ||
489 | tcm_loop_primary = root_device_register("tcm_loop_0"); | |
490 | if (IS_ERR(tcm_loop_primary)) { | |
6708bb27 | 491 | pr_err("Unable to allocate tcm_loop_primary\n"); |
3703b2c5 NB |
492 | return PTR_ERR(tcm_loop_primary); |
493 | } | |
494 | ||
495 | ret = bus_register(&tcm_loop_lld_bus); | |
496 | if (ret) { | |
6708bb27 | 497 | pr_err("bus_register() failed for tcm_loop_lld_bus\n"); |
3703b2c5 NB |
498 | goto dev_unreg; |
499 | } | |
500 | ||
501 | ret = driver_register(&tcm_loop_driverfs); | |
502 | if (ret) { | |
6708bb27 | 503 | pr_err("driver_register() failed for" |
3703b2c5 NB |
504 | "tcm_loop_driverfs\n"); |
505 | goto bus_unreg; | |
506 | } | |
507 | ||
6708bb27 | 508 | pr_debug("Initialized TCM Loop Core Bus\n"); |
3703b2c5 NB |
509 | return ret; |
510 | ||
511 | bus_unreg: | |
512 | bus_unregister(&tcm_loop_lld_bus); | |
513 | dev_unreg: | |
514 | root_device_unregister(tcm_loop_primary); | |
515 | return ret; | |
516 | } | |
517 | ||
518 | static void tcm_loop_release_core_bus(void) | |
519 | { | |
520 | driver_unregister(&tcm_loop_driverfs); | |
521 | bus_unregister(&tcm_loop_lld_bus); | |
522 | root_device_unregister(tcm_loop_primary); | |
523 | ||
6708bb27 | 524 | pr_debug("Releasing TCM Loop Core BUS\n"); |
3703b2c5 NB |
525 | } |
526 | ||
527 | static char *tcm_loop_get_fabric_name(void) | |
528 | { | |
529 | return "loopback"; | |
530 | } | |
531 | ||
532 | static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg) | |
533 | { | |
8359cf43 | 534 | struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; |
3703b2c5 NB |
535 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; |
536 | /* | |
537 | * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba() | |
538 | * time based on the protocol dependent prefix of the passed configfs group. | |
539 | * | |
540 | * Based upon tl_proto_id, TCM_Loop emulates the requested fabric | |
541 | * ProtocolID using target_core_fabric_lib.c symbols. | |
542 | */ | |
543 | switch (tl_hba->tl_proto_id) { | |
544 | case SCSI_PROTOCOL_SAS: | |
545 | return sas_get_fabric_proto_ident(se_tpg); | |
546 | case SCSI_PROTOCOL_FCP: | |
547 | return fc_get_fabric_proto_ident(se_tpg); | |
548 | case SCSI_PROTOCOL_ISCSI: | |
549 | return iscsi_get_fabric_proto_ident(se_tpg); | |
550 | default: | |
6708bb27 | 551 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
552 | " SAS emulation\n", tl_hba->tl_proto_id); |
553 | break; | |
554 | } | |
555 | ||
556 | return sas_get_fabric_proto_ident(se_tpg); | |
557 | } | |
558 | ||
559 | static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg) | |
560 | { | |
8359cf43 | 561 | struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; |
3703b2c5 NB |
562 | /* |
563 | * Return the passed NAA identifier for the SAS Target Port | |
564 | */ | |
565 | return &tl_tpg->tl_hba->tl_wwn_address[0]; | |
566 | } | |
567 | ||
568 | static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg) | |
569 | { | |
8359cf43 | 570 | struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; |
3703b2c5 NB |
571 | /* |
572 | * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 | |
573 | * to represent the SCSI Target Port. | |
574 | */ | |
575 | return tl_tpg->tl_tpgt; | |
576 | } | |
577 | ||
578 | static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg) | |
579 | { | |
580 | return 1; | |
581 | } | |
582 | ||
583 | static u32 tcm_loop_get_pr_transport_id( | |
584 | struct se_portal_group *se_tpg, | |
585 | struct se_node_acl *se_nacl, | |
586 | struct t10_pr_registration *pr_reg, | |
587 | int *format_code, | |
588 | unsigned char *buf) | |
589 | { | |
8359cf43 | 590 | struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; |
3703b2c5 NB |
591 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; |
592 | ||
593 | switch (tl_hba->tl_proto_id) { | |
594 | case SCSI_PROTOCOL_SAS: | |
595 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
596 | format_code, buf); | |
597 | case SCSI_PROTOCOL_FCP: | |
598 | return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
599 | format_code, buf); | |
600 | case SCSI_PROTOCOL_ISCSI: | |
601 | return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
602 | format_code, buf); | |
603 | default: | |
6708bb27 | 604 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
605 | " SAS emulation\n", tl_hba->tl_proto_id); |
606 | break; | |
607 | } | |
608 | ||
609 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
610 | format_code, buf); | |
611 | } | |
612 | ||
613 | static u32 tcm_loop_get_pr_transport_id_len( | |
614 | struct se_portal_group *se_tpg, | |
615 | struct se_node_acl *se_nacl, | |
616 | struct t10_pr_registration *pr_reg, | |
617 | int *format_code) | |
618 | { | |
8359cf43 | 619 | struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; |
3703b2c5 NB |
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_len(se_tpg, se_nacl, pr_reg, | |
625 | format_code); | |
626 | case SCSI_PROTOCOL_FCP: | |
627 | return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
628 | format_code); | |
629 | case SCSI_PROTOCOL_ISCSI: | |
630 | return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
631 | format_code); | |
632 | default: | |
6708bb27 | 633 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
634 | " SAS emulation\n", tl_hba->tl_proto_id); |
635 | break; | |
636 | } | |
637 | ||
638 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
639 | format_code); | |
640 | } | |
641 | ||
642 | /* | |
643 | * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above | |
644 | * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. | |
645 | */ | |
646 | static char *tcm_loop_parse_pr_out_transport_id( | |
647 | struct se_portal_group *se_tpg, | |
648 | const char *buf, | |
649 | u32 *out_tid_len, | |
650 | char **port_nexus_ptr) | |
651 | { | |
8359cf43 | 652 | struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; |
3703b2c5 NB |
653 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; |
654 | ||
655 | switch (tl_hba->tl_proto_id) { | |
656 | case SCSI_PROTOCOL_SAS: | |
657 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
658 | port_nexus_ptr); | |
659 | case SCSI_PROTOCOL_FCP: | |
660 | return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
661 | port_nexus_ptr); | |
662 | case SCSI_PROTOCOL_ISCSI: | |
663 | return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
664 | port_nexus_ptr); | |
665 | default: | |
6708bb27 | 666 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
667 | " SAS emulation\n", tl_hba->tl_proto_id); |
668 | break; | |
669 | } | |
670 | ||
671 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
672 | port_nexus_ptr); | |
673 | } | |
674 | ||
675 | /* | |
676 | * Returning (1) here allows for target_core_mod struct se_node_acl to be generated | |
677 | * based upon the incoming fabric dependent SCSI Initiator Port | |
678 | */ | |
679 | static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) | |
680 | { | |
681 | return 1; | |
682 | } | |
683 | ||
684 | static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) | |
685 | { | |
686 | return 0; | |
687 | } | |
688 | ||
689 | /* | |
690 | * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for | |
691 | * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest | |
692 | */ | |
693 | static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) | |
694 | { | |
695 | return 0; | |
696 | } | |
697 | ||
698 | /* | |
699 | * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will | |
700 | * never be called for TCM_Loop by target_core_fabric_configfs.c code. | |
701 | * It has been added here as a nop for target_fabric_tf_ops_check() | |
702 | */ | |
703 | static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) | |
704 | { | |
705 | return 0; | |
706 | } | |
707 | ||
708 | static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl( | |
709 | struct se_portal_group *se_tpg) | |
710 | { | |
711 | struct tcm_loop_nacl *tl_nacl; | |
712 | ||
713 | tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL); | |
714 | if (!tl_nacl) { | |
6708bb27 | 715 | pr_err("Unable to allocate struct tcm_loop_nacl\n"); |
3703b2c5 NB |
716 | return NULL; |
717 | } | |
718 | ||
719 | return &tl_nacl->se_node_acl; | |
720 | } | |
721 | ||
722 | static void tcm_loop_tpg_release_fabric_acl( | |
723 | struct se_portal_group *se_tpg, | |
724 | struct se_node_acl *se_nacl) | |
725 | { | |
726 | struct tcm_loop_nacl *tl_nacl = container_of(se_nacl, | |
727 | struct tcm_loop_nacl, se_node_acl); | |
728 | ||
729 | kfree(tl_nacl); | |
730 | } | |
731 | ||
732 | static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) | |
733 | { | |
734 | return 1; | |
735 | } | |
736 | ||
3703b2c5 NB |
737 | static u32 tcm_loop_sess_get_index(struct se_session *se_sess) |
738 | { | |
739 | return 1; | |
740 | } | |
741 | ||
742 | static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) | |
743 | { | |
744 | return; | |
745 | } | |
746 | ||
747 | static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd) | |
748 | { | |
749 | return 1; | |
750 | } | |
751 | ||
752 | static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) | |
753 | { | |
754 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
755 | struct tcm_loop_cmd, tl_se_cmd); | |
756 | ||
757 | return tl_cmd->sc_cmd_state; | |
758 | } | |
759 | ||
760 | static int tcm_loop_shutdown_session(struct se_session *se_sess) | |
761 | { | |
762 | return 0; | |
763 | } | |
764 | ||
765 | static void tcm_loop_close_session(struct se_session *se_sess) | |
766 | { | |
767 | return; | |
768 | }; | |
769 | ||
3703b2c5 NB |
770 | static int tcm_loop_write_pending(struct se_cmd *se_cmd) |
771 | { | |
772 | /* | |
773 | * Since Linux/SCSI has already sent down a struct scsi_cmnd | |
774 | * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array | |
775 | * memory, and memory has already been mapped to struct se_cmd->t_mem_list | |
776 | * format with transport_generic_map_mem_to_cmd(). | |
777 | * | |
778 | * We now tell TCM to add this WRITE CDB directly into the TCM storage | |
779 | * object execution queue. | |
780 | */ | |
70baf0ab | 781 | target_execute_cmd(se_cmd); |
3703b2c5 NB |
782 | return 0; |
783 | } | |
784 | ||
785 | static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) | |
786 | { | |
787 | return 0; | |
788 | } | |
789 | ||
790 | static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) | |
791 | { | |
792 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
793 | struct tcm_loop_cmd, tl_se_cmd); | |
794 | struct scsi_cmnd *sc = tl_cmd->sc; | |
795 | ||
6708bb27 | 796 | pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" |
3703b2c5 NB |
797 | " cdb: 0x%02x\n", sc, sc->cmnd[0]); |
798 | ||
799 | sc->result = SAM_STAT_GOOD; | |
800 | set_host_byte(sc, DID_OK); | |
6cf3fa69 RD |
801 | if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || |
802 | (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) | |
803 | scsi_set_resid(sc, se_cmd->residual_count); | |
3703b2c5 NB |
804 | sc->scsi_done(sc); |
805 | return 0; | |
806 | } | |
807 | ||
808 | static int tcm_loop_queue_status(struct se_cmd *se_cmd) | |
809 | { | |
810 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
811 | struct tcm_loop_cmd, tl_se_cmd); | |
812 | struct scsi_cmnd *sc = tl_cmd->sc; | |
813 | ||
6708bb27 | 814 | pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" |
3703b2c5 NB |
815 | " cdb: 0x%02x\n", sc, sc->cmnd[0]); |
816 | ||
817 | if (se_cmd->sense_buffer && | |
818 | ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || | |
819 | (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { | |
820 | ||
5951146d | 821 | memcpy(sc->sense_buffer, se_cmd->sense_buffer, |
3703b2c5 NB |
822 | SCSI_SENSE_BUFFERSIZE); |
823 | sc->result = SAM_STAT_CHECK_CONDITION; | |
824 | set_driver_byte(sc, DRIVER_SENSE); | |
825 | } else | |
826 | sc->result = se_cmd->scsi_status; | |
827 | ||
828 | set_host_byte(sc, DID_OK); | |
6cf3fa69 RD |
829 | if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || |
830 | (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) | |
831 | scsi_set_resid(sc, se_cmd->residual_count); | |
3703b2c5 NB |
832 | sc->scsi_done(sc); |
833 | return 0; | |
834 | } | |
835 | ||
836 | static int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) | |
837 | { | |
838 | struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; | |
839 | struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; | |
840 | /* | |
841 | * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead | |
842 | * and wake up the wait_queue_head_t in tcm_loop_device_reset() | |
843 | */ | |
844 | atomic_set(&tl_tmr->tmr_complete, 1); | |
845 | wake_up(&tl_tmr->tl_tmr_wait); | |
846 | return 0; | |
847 | } | |
848 | ||
849 | static u16 tcm_loop_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length) | |
850 | { | |
851 | return 0; | |
852 | } | |
853 | ||
854 | static u16 tcm_loop_get_fabric_sense_len(void) | |
855 | { | |
856 | return 0; | |
857 | } | |
858 | ||
3703b2c5 NB |
859 | static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) |
860 | { | |
861 | switch (tl_hba->tl_proto_id) { | |
862 | case SCSI_PROTOCOL_SAS: | |
863 | return "SAS"; | |
864 | case SCSI_PROTOCOL_FCP: | |
865 | return "FCP"; | |
866 | case SCSI_PROTOCOL_ISCSI: | |
867 | return "iSCSI"; | |
868 | default: | |
869 | break; | |
870 | } | |
871 | ||
872 | return "Unknown"; | |
873 | } | |
874 | ||
875 | /* Start items for tcm_loop_port_cit */ | |
876 | ||
877 | static int tcm_loop_port_link( | |
878 | struct se_portal_group *se_tpg, | |
879 | struct se_lun *lun) | |
880 | { | |
881 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
882 | struct tcm_loop_tpg, tl_se_tpg); | |
883 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
884 | ||
885 | atomic_inc(&tl_tpg->tl_tpg_port_count); | |
886 | smp_mb__after_atomic_inc(); | |
887 | /* | |
888 | * Add Linux/SCSI struct scsi_device by HCTL | |
889 | */ | |
890 | scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); | |
891 | ||
6708bb27 | 892 | pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); |
3703b2c5 NB |
893 | return 0; |
894 | } | |
895 | ||
896 | static void tcm_loop_port_unlink( | |
897 | struct se_portal_group *se_tpg, | |
898 | struct se_lun *se_lun) | |
899 | { | |
900 | struct scsi_device *sd; | |
901 | struct tcm_loop_hba *tl_hba; | |
902 | struct tcm_loop_tpg *tl_tpg; | |
903 | ||
904 | tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); | |
905 | tl_hba = tl_tpg->tl_hba; | |
906 | ||
907 | sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, | |
908 | se_lun->unpacked_lun); | |
909 | if (!sd) { | |
6708bb27 | 910 | pr_err("Unable to locate struct scsi_device for %d:%d:" |
3703b2c5 NB |
911 | "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); |
912 | return; | |
913 | } | |
914 | /* | |
915 | * Remove Linux/SCSI struct scsi_device by HCTL | |
916 | */ | |
917 | scsi_remove_device(sd); | |
918 | scsi_device_put(sd); | |
919 | ||
920 | atomic_dec(&tl_tpg->tl_tpg_port_count); | |
921 | smp_mb__after_atomic_dec(); | |
922 | ||
6708bb27 | 923 | pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); |
3703b2c5 NB |
924 | } |
925 | ||
926 | /* End items for tcm_loop_port_cit */ | |
927 | ||
928 | /* Start items for tcm_loop_nexus_cit */ | |
929 | ||
930 | static int tcm_loop_make_nexus( | |
931 | struct tcm_loop_tpg *tl_tpg, | |
932 | const char *name) | |
933 | { | |
934 | struct se_portal_group *se_tpg; | |
935 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
936 | struct tcm_loop_nexus *tl_nexus; | |
552523dc | 937 | int ret = -ENOMEM; |
3703b2c5 NB |
938 | |
939 | if (tl_tpg->tl_hba->tl_nexus) { | |
6708bb27 | 940 | pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n"); |
3703b2c5 NB |
941 | return -EEXIST; |
942 | } | |
943 | se_tpg = &tl_tpg->tl_se_tpg; | |
944 | ||
945 | tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); | |
946 | if (!tl_nexus) { | |
6708bb27 | 947 | pr_err("Unable to allocate struct tcm_loop_nexus\n"); |
3703b2c5 NB |
948 | return -ENOMEM; |
949 | } | |
950 | /* | |
951 | * Initialize the struct se_session pointer | |
952 | */ | |
953 | tl_nexus->se_sess = transport_init_session(); | |
552523dc DC |
954 | if (IS_ERR(tl_nexus->se_sess)) { |
955 | ret = PTR_ERR(tl_nexus->se_sess); | |
3703b2c5 | 956 | goto out; |
552523dc | 957 | } |
3703b2c5 NB |
958 | /* |
959 | * Since we are running in 'demo mode' this call with generate a | |
960 | * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI | |
961 | * Initiator port name of the passed configfs group 'name'. | |
962 | */ | |
963 | tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
964 | se_tpg, (unsigned char *)name); | |
965 | if (!tl_nexus->se_sess->se_node_acl) { | |
966 | transport_free_session(tl_nexus->se_sess); | |
967 | goto out; | |
968 | } | |
969 | /* | |
970 | * Now, register the SAS I_T Nexus as active with the call to | |
971 | * transport_register_session() | |
972 | */ | |
973 | __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, | |
5951146d | 974 | tl_nexus->se_sess, tl_nexus); |
3703b2c5 | 975 | tl_tpg->tl_hba->tl_nexus = tl_nexus; |
6708bb27 | 976 | pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" |
3703b2c5 NB |
977 | " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), |
978 | name); | |
979 | return 0; | |
980 | ||
981 | out: | |
982 | kfree(tl_nexus); | |
552523dc | 983 | return ret; |
3703b2c5 NB |
984 | } |
985 | ||
986 | static int tcm_loop_drop_nexus( | |
987 | struct tcm_loop_tpg *tpg) | |
988 | { | |
989 | struct se_session *se_sess; | |
990 | struct tcm_loop_nexus *tl_nexus; | |
991 | struct tcm_loop_hba *tl_hba = tpg->tl_hba; | |
992 | ||
993 | tl_nexus = tpg->tl_hba->tl_nexus; | |
994 | if (!tl_nexus) | |
995 | return -ENODEV; | |
996 | ||
997 | se_sess = tl_nexus->se_sess; | |
998 | if (!se_sess) | |
999 | return -ENODEV; | |
1000 | ||
1001 | if (atomic_read(&tpg->tl_tpg_port_count)) { | |
6708bb27 | 1002 | pr_err("Unable to remove TCM_Loop I_T Nexus with" |
3703b2c5 NB |
1003 | " active TPG port count: %d\n", |
1004 | atomic_read(&tpg->tl_tpg_port_count)); | |
1005 | return -EPERM; | |
1006 | } | |
1007 | ||
6708bb27 | 1008 | pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" |
3703b2c5 NB |
1009 | " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), |
1010 | tl_nexus->se_sess->se_node_acl->initiatorname); | |
1011 | /* | |
1012 | * Release the SCSI I_T Nexus to the emulated SAS Target Port | |
1013 | */ | |
1014 | transport_deregister_session(tl_nexus->se_sess); | |
1015 | tpg->tl_hba->tl_nexus = NULL; | |
1016 | kfree(tl_nexus); | |
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | /* End items for tcm_loop_nexus_cit */ | |
1021 | ||
1022 | static ssize_t tcm_loop_tpg_show_nexus( | |
1023 | struct se_portal_group *se_tpg, | |
1024 | char *page) | |
1025 | { | |
1026 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1027 | struct tcm_loop_tpg, tl_se_tpg); | |
1028 | struct tcm_loop_nexus *tl_nexus; | |
1029 | ssize_t ret; | |
1030 | ||
1031 | tl_nexus = tl_tpg->tl_hba->tl_nexus; | |
1032 | if (!tl_nexus) | |
1033 | return -ENODEV; | |
1034 | ||
1035 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1036 | tl_nexus->se_sess->se_node_acl->initiatorname); | |
1037 | ||
1038 | return ret; | |
1039 | } | |
1040 | ||
1041 | static ssize_t tcm_loop_tpg_store_nexus( | |
1042 | struct se_portal_group *se_tpg, | |
1043 | const char *page, | |
1044 | size_t count) | |
1045 | { | |
1046 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1047 | struct tcm_loop_tpg, tl_se_tpg); | |
1048 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
1049 | unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; | |
1050 | int ret; | |
1051 | /* | |
1052 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
1053 | */ | |
1054 | if (!strncmp(page, "NULL", 4)) { | |
1055 | ret = tcm_loop_drop_nexus(tl_tpg); | |
1056 | return (!ret) ? count : ret; | |
1057 | } | |
1058 | /* | |
1059 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1060 | * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call | |
1061 | * tcm_loop_make_nexus() | |
1062 | */ | |
60d645a4 | 1063 | if (strlen(page) >= TL_WWN_ADDR_LEN) { |
6708bb27 | 1064 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
3703b2c5 NB |
1065 | " max: %d\n", page, TL_WWN_ADDR_LEN); |
1066 | return -EINVAL; | |
1067 | } | |
1068 | snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); | |
1069 | ||
1070 | ptr = strstr(i_port, "naa."); | |
1071 | if (ptr) { | |
1072 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { | |
6708bb27 | 1073 | pr_err("Passed SAS Initiator Port %s does not" |
3703b2c5 NB |
1074 | " match target port protoid: %s\n", i_port, |
1075 | tcm_loop_dump_proto_id(tl_hba)); | |
1076 | return -EINVAL; | |
1077 | } | |
1078 | port_ptr = &i_port[0]; | |
1079 | goto check_newline; | |
1080 | } | |
1081 | ptr = strstr(i_port, "fc."); | |
1082 | if (ptr) { | |
1083 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { | |
6708bb27 | 1084 | pr_err("Passed FCP Initiator Port %s does not" |
3703b2c5 NB |
1085 | " match target port protoid: %s\n", i_port, |
1086 | tcm_loop_dump_proto_id(tl_hba)); | |
1087 | return -EINVAL; | |
1088 | } | |
1089 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1090 | goto check_newline; | |
1091 | } | |
1092 | ptr = strstr(i_port, "iqn."); | |
1093 | if (ptr) { | |
1094 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { | |
6708bb27 | 1095 | pr_err("Passed iSCSI Initiator Port %s does not" |
3703b2c5 NB |
1096 | " match target port protoid: %s\n", i_port, |
1097 | tcm_loop_dump_proto_id(tl_hba)); | |
1098 | return -EINVAL; | |
1099 | } | |
1100 | port_ptr = &i_port[0]; | |
1101 | goto check_newline; | |
1102 | } | |
6708bb27 | 1103 | pr_err("Unable to locate prefix for emulated Initiator Port:" |
3703b2c5 NB |
1104 | " %s\n", i_port); |
1105 | return -EINVAL; | |
1106 | /* | |
1107 | * Clear any trailing newline for the NAA WWN | |
1108 | */ | |
1109 | check_newline: | |
1110 | if (i_port[strlen(i_port)-1] == '\n') | |
1111 | i_port[strlen(i_port)-1] = '\0'; | |
1112 | ||
1113 | ret = tcm_loop_make_nexus(tl_tpg, port_ptr); | |
1114 | if (ret < 0) | |
1115 | return ret; | |
1116 | ||
1117 | return count; | |
1118 | } | |
1119 | ||
1120 | TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); | |
1121 | ||
1122 | static struct configfs_attribute *tcm_loop_tpg_attrs[] = { | |
1123 | &tcm_loop_tpg_nexus.attr, | |
1124 | NULL, | |
1125 | }; | |
1126 | ||
1127 | /* Start items for tcm_loop_naa_cit */ | |
1128 | ||
1129 | struct se_portal_group *tcm_loop_make_naa_tpg( | |
1130 | struct se_wwn *wwn, | |
1131 | struct config_group *group, | |
1132 | const char *name) | |
1133 | { | |
1134 | struct tcm_loop_hba *tl_hba = container_of(wwn, | |
1135 | struct tcm_loop_hba, tl_hba_wwn); | |
1136 | struct tcm_loop_tpg *tl_tpg; | |
1137 | char *tpgt_str, *end_ptr; | |
1138 | int ret; | |
1139 | unsigned short int tpgt; | |
1140 | ||
1141 | tpgt_str = strstr(name, "tpgt_"); | |
1142 | if (!tpgt_str) { | |
6708bb27 | 1143 | pr_err("Unable to locate \"tpgt_#\" directory" |
3703b2c5 NB |
1144 | " group\n"); |
1145 | return ERR_PTR(-EINVAL); | |
1146 | } | |
1147 | tpgt_str += 5; /* Skip ahead of "tpgt_" */ | |
1148 | tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0); | |
1149 | ||
12f09ccb | 1150 | if (tpgt >= TL_TPGS_PER_HBA) { |
6708bb27 | 1151 | pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:" |
3703b2c5 NB |
1152 | " %u\n", tpgt, TL_TPGS_PER_HBA); |
1153 | return ERR_PTR(-EINVAL); | |
1154 | } | |
1155 | tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; | |
1156 | tl_tpg->tl_hba = tl_hba; | |
1157 | tl_tpg->tl_tpgt = tpgt; | |
1158 | /* | |
1159 | * Register the tl_tpg as a emulated SAS TCM Target Endpoint | |
1160 | */ | |
1161 | ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops, | |
5951146d | 1162 | wwn, &tl_tpg->tl_se_tpg, tl_tpg, |
3703b2c5 NB |
1163 | TRANSPORT_TPG_TYPE_NORMAL); |
1164 | if (ret < 0) | |
1165 | return ERR_PTR(-ENOMEM); | |
1166 | ||
6708bb27 | 1167 | pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" |
3703b2c5 NB |
1168 | " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), |
1169 | config_item_name(&wwn->wwn_group.cg_item), tpgt); | |
1170 | ||
1171 | return &tl_tpg->tl_se_tpg; | |
1172 | } | |
1173 | ||
1174 | void tcm_loop_drop_naa_tpg( | |
1175 | struct se_portal_group *se_tpg) | |
1176 | { | |
1177 | struct se_wwn *wwn = se_tpg->se_tpg_wwn; | |
1178 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1179 | struct tcm_loop_tpg, tl_se_tpg); | |
1180 | struct tcm_loop_hba *tl_hba; | |
1181 | unsigned short tpgt; | |
1182 | ||
1183 | tl_hba = tl_tpg->tl_hba; | |
1184 | tpgt = tl_tpg->tl_tpgt; | |
1185 | /* | |
1186 | * Release the I_T Nexus for the Virtual SAS link if present | |
1187 | */ | |
1188 | tcm_loop_drop_nexus(tl_tpg); | |
1189 | /* | |
1190 | * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint | |
1191 | */ | |
1192 | core_tpg_deregister(se_tpg); | |
1193 | ||
0a020436 NB |
1194 | tl_tpg->tl_hba = NULL; |
1195 | tl_tpg->tl_tpgt = 0; | |
1196 | ||
6708bb27 | 1197 | pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" |
3703b2c5 NB |
1198 | " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), |
1199 | config_item_name(&wwn->wwn_group.cg_item), tpgt); | |
1200 | } | |
1201 | ||
1202 | /* End items for tcm_loop_naa_cit */ | |
1203 | ||
1204 | /* Start items for tcm_loop_cit */ | |
1205 | ||
1206 | struct se_wwn *tcm_loop_make_scsi_hba( | |
1207 | struct target_fabric_configfs *tf, | |
1208 | struct config_group *group, | |
1209 | const char *name) | |
1210 | { | |
1211 | struct tcm_loop_hba *tl_hba; | |
1212 | struct Scsi_Host *sh; | |
1213 | char *ptr; | |
1214 | int ret, off = 0; | |
1215 | ||
1216 | tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); | |
1217 | if (!tl_hba) { | |
6708bb27 | 1218 | pr_err("Unable to allocate struct tcm_loop_hba\n"); |
3703b2c5 NB |
1219 | return ERR_PTR(-ENOMEM); |
1220 | } | |
1221 | /* | |
1222 | * Determine the emulated Protocol Identifier and Target Port Name | |
1223 | * based on the incoming configfs directory name. | |
1224 | */ | |
1225 | ptr = strstr(name, "naa."); | |
1226 | if (ptr) { | |
1227 | tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; | |
1228 | goto check_len; | |
1229 | } | |
1230 | ptr = strstr(name, "fc."); | |
1231 | if (ptr) { | |
1232 | tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; | |
1233 | off = 3; /* Skip over "fc." */ | |
1234 | goto check_len; | |
1235 | } | |
1236 | ptr = strstr(name, "iqn."); | |
a57b5d36 | 1237 | if (!ptr) { |
6708bb27 | 1238 | pr_err("Unable to locate prefix for emulated Target " |
a57b5d36 JJ |
1239 | "Port: %s\n", name); |
1240 | ret = -EINVAL; | |
1241 | goto out; | |
3703b2c5 | 1242 | } |
a57b5d36 | 1243 | tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; |
3703b2c5 NB |
1244 | |
1245 | check_len: | |
60d645a4 | 1246 | if (strlen(name) >= TL_WWN_ADDR_LEN) { |
6708bb27 | 1247 | pr_err("Emulated NAA %s Address: %s, exceeds" |
3703b2c5 NB |
1248 | " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), |
1249 | TL_WWN_ADDR_LEN); | |
a57b5d36 JJ |
1250 | ret = -EINVAL; |
1251 | goto out; | |
3703b2c5 NB |
1252 | } |
1253 | snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); | |
1254 | ||
1255 | /* | |
1256 | * Call device_register(tl_hba->dev) to register the emulated | |
1257 | * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after | |
1258 | * device_register() callbacks in tcm_loop_driver_probe() | |
1259 | */ | |
1260 | ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); | |
1261 | if (ret) | |
1262 | goto out; | |
1263 | ||
1264 | sh = tl_hba->sh; | |
1265 | tcm_loop_hba_no_cnt++; | |
6708bb27 | 1266 | pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" |
3703b2c5 NB |
1267 | " %s Address: %s at Linux/SCSI Host ID: %d\n", |
1268 | tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); | |
1269 | ||
1270 | return &tl_hba->tl_hba_wwn; | |
1271 | out: | |
1272 | kfree(tl_hba); | |
1273 | return ERR_PTR(ret); | |
1274 | } | |
1275 | ||
1276 | void tcm_loop_drop_scsi_hba( | |
1277 | struct se_wwn *wwn) | |
1278 | { | |
1279 | struct tcm_loop_hba *tl_hba = container_of(wwn, | |
1280 | struct tcm_loop_hba, tl_hba_wwn); | |
6297b07c NB |
1281 | |
1282 | pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target" | |
1283 | " SAS Address: %s at Linux/SCSI Host ID: %d\n", | |
1284 | tl_hba->tl_wwn_address, tl_hba->sh->host_no); | |
3703b2c5 NB |
1285 | /* |
1286 | * Call device_unregister() on the original tl_hba->dev. | |
1287 | * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will | |
1288 | * release *tl_hba; | |
1289 | */ | |
1290 | device_unregister(&tl_hba->dev); | |
3703b2c5 NB |
1291 | } |
1292 | ||
1293 | /* Start items for tcm_loop_cit */ | |
1294 | static ssize_t tcm_loop_wwn_show_attr_version( | |
1295 | struct target_fabric_configfs *tf, | |
1296 | char *page) | |
1297 | { | |
1298 | return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); | |
1299 | } | |
1300 | ||
1301 | TF_WWN_ATTR_RO(tcm_loop, version); | |
1302 | ||
1303 | static struct configfs_attribute *tcm_loop_wwn_attrs[] = { | |
1304 | &tcm_loop_wwn_version.attr, | |
1305 | NULL, | |
1306 | }; | |
1307 | ||
1308 | /* End items for tcm_loop_cit */ | |
1309 | ||
1310 | static int tcm_loop_register_configfs(void) | |
1311 | { | |
1312 | struct target_fabric_configfs *fabric; | |
3703b2c5 NB |
1313 | int ret; |
1314 | /* | |
1315 | * Set the TCM Loop HBA counter to zero | |
1316 | */ | |
1317 | tcm_loop_hba_no_cnt = 0; | |
1318 | /* | |
1319 | * Register the top level struct config_item_type with TCM core | |
1320 | */ | |
1321 | fabric = target_fabric_configfs_init(THIS_MODULE, "loopback"); | |
e3d6f909 | 1322 | if (IS_ERR(fabric)) { |
6708bb27 | 1323 | pr_err("tcm_loop_register_configfs() failed!\n"); |
e3d6f909 | 1324 | return PTR_ERR(fabric); |
3703b2c5 NB |
1325 | } |
1326 | /* | |
1327 | * Setup the fabric API of function pointers used by target_core_mod | |
1328 | */ | |
1329 | fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name; | |
1330 | fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident; | |
1331 | fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn; | |
1332 | fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag; | |
1333 | fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth; | |
1334 | fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id; | |
1335 | fabric->tf_ops.tpg_get_pr_transport_id_len = | |
1336 | &tcm_loop_get_pr_transport_id_len; | |
1337 | fabric->tf_ops.tpg_parse_pr_out_transport_id = | |
1338 | &tcm_loop_parse_pr_out_transport_id; | |
1339 | fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode; | |
1340 | fabric->tf_ops.tpg_check_demo_mode_cache = | |
1341 | &tcm_loop_check_demo_mode_cache; | |
1342 | fabric->tf_ops.tpg_check_demo_mode_write_protect = | |
1343 | &tcm_loop_check_demo_mode_write_protect; | |
1344 | fabric->tf_ops.tpg_check_prod_mode_write_protect = | |
1345 | &tcm_loop_check_prod_mode_write_protect; | |
1346 | /* | |
1347 | * The TCM loopback fabric module runs in demo-mode to a local | |
1348 | * virtual SCSI device, so fabric dependent initator ACLs are | |
1349 | * not required. | |
1350 | */ | |
1351 | fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl; | |
1352 | fabric->tf_ops.tpg_release_fabric_acl = | |
1353 | &tcm_loop_tpg_release_fabric_acl; | |
1354 | fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index; | |
3703b2c5 NB |
1355 | /* |
1356 | * Used for setting up remaining TCM resources in process context | |
1357 | */ | |
3703b2c5 | 1358 | fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free; |
35462975 | 1359 | fabric->tf_ops.release_cmd = &tcm_loop_release_cmd; |
3703b2c5 NB |
1360 | fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session; |
1361 | fabric->tf_ops.close_session = &tcm_loop_close_session; | |
3703b2c5 NB |
1362 | fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index; |
1363 | fabric->tf_ops.sess_get_initiator_sid = NULL; | |
1364 | fabric->tf_ops.write_pending = &tcm_loop_write_pending; | |
1365 | fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status; | |
1366 | /* | |
1367 | * Not used for TCM loopback | |
1368 | */ | |
1369 | fabric->tf_ops.set_default_node_attributes = | |
1370 | &tcm_loop_set_default_node_attributes; | |
1371 | fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag; | |
1372 | fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state; | |
3703b2c5 NB |
1373 | fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in; |
1374 | fabric->tf_ops.queue_status = &tcm_loop_queue_status; | |
1375 | fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp; | |
1376 | fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len; | |
1377 | fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len; | |
3703b2c5 | 1378 | |
3703b2c5 NB |
1379 | /* |
1380 | * Setup function pointers for generic logic in target_core_fabric_configfs.c | |
1381 | */ | |
1382 | fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba; | |
1383 | fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba; | |
1384 | fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg; | |
1385 | fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg; | |
1386 | /* | |
1387 | * fabric_post_link() and fabric_pre_unlink() are used for | |
1388 | * registration and release of TCM Loop Virtual SCSI LUNs. | |
1389 | */ | |
1390 | fabric->tf_ops.fabric_post_link = &tcm_loop_port_link; | |
1391 | fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink; | |
1392 | fabric->tf_ops.fabric_make_np = NULL; | |
1393 | fabric->tf_ops.fabric_drop_np = NULL; | |
1394 | /* | |
1395 | * Setup default attribute lists for various fabric->tf_cit_tmpl | |
1396 | */ | |
1397 | TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs; | |
1398 | TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs; | |
1399 | TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL; | |
1400 | TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL; | |
1401 | TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL; | |
1402 | /* | |
1403 | * Once fabric->tf_ops has been setup, now register the fabric for | |
1404 | * use within TCM | |
1405 | */ | |
1406 | ret = target_fabric_configfs_register(fabric); | |
1407 | if (ret < 0) { | |
6708bb27 | 1408 | pr_err("target_fabric_configfs_register() for" |
3703b2c5 NB |
1409 | " TCM_Loop failed!\n"); |
1410 | target_fabric_configfs_free(fabric); | |
1411 | return -1; | |
1412 | } | |
1413 | /* | |
1414 | * Setup our local pointer to *fabric. | |
1415 | */ | |
1416 | tcm_loop_fabric_configfs = fabric; | |
6708bb27 | 1417 | pr_debug("TCM_LOOP[0] - Set fabric ->" |
3703b2c5 NB |
1418 | " tcm_loop_fabric_configfs\n"); |
1419 | return 0; | |
1420 | } | |
1421 | ||
1422 | static void tcm_loop_deregister_configfs(void) | |
1423 | { | |
1424 | if (!tcm_loop_fabric_configfs) | |
1425 | return; | |
1426 | ||
1427 | target_fabric_configfs_deregister(tcm_loop_fabric_configfs); | |
1428 | tcm_loop_fabric_configfs = NULL; | |
6708bb27 | 1429 | pr_debug("TCM_LOOP[0] - Cleared" |
3703b2c5 NB |
1430 | " tcm_loop_fabric_configfs\n"); |
1431 | } | |
1432 | ||
1433 | static int __init tcm_loop_fabric_init(void) | |
1434 | { | |
afe2cb7f CH |
1435 | int ret = -ENOMEM; |
1436 | ||
1437 | tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0); | |
1438 | if (!tcm_loop_workqueue) | |
1439 | goto out; | |
3703b2c5 NB |
1440 | |
1441 | tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", | |
1442 | sizeof(struct tcm_loop_cmd), | |
1443 | __alignof__(struct tcm_loop_cmd), | |
1444 | 0, NULL); | |
1445 | if (!tcm_loop_cmd_cache) { | |
6708bb27 | 1446 | pr_debug("kmem_cache_create() for" |
3703b2c5 | 1447 | " tcm_loop_cmd_cache failed\n"); |
afe2cb7f | 1448 | goto out_destroy_workqueue; |
3703b2c5 NB |
1449 | } |
1450 | ||
1451 | ret = tcm_loop_alloc_core_bus(); | |
1452 | if (ret) | |
afe2cb7f | 1453 | goto out_destroy_cache; |
3703b2c5 NB |
1454 | |
1455 | ret = tcm_loop_register_configfs(); | |
afe2cb7f CH |
1456 | if (ret) |
1457 | goto out_release_core_bus; | |
3703b2c5 NB |
1458 | |
1459 | return 0; | |
afe2cb7f CH |
1460 | |
1461 | out_release_core_bus: | |
1462 | tcm_loop_release_core_bus(); | |
1463 | out_destroy_cache: | |
1464 | kmem_cache_destroy(tcm_loop_cmd_cache); | |
1465 | out_destroy_workqueue: | |
1466 | destroy_workqueue(tcm_loop_workqueue); | |
1467 | out: | |
1468 | return ret; | |
3703b2c5 NB |
1469 | } |
1470 | ||
1471 | static void __exit tcm_loop_fabric_exit(void) | |
1472 | { | |
1473 | tcm_loop_deregister_configfs(); | |
1474 | tcm_loop_release_core_bus(); | |
1475 | kmem_cache_destroy(tcm_loop_cmd_cache); | |
afe2cb7f | 1476 | destroy_workqueue(tcm_loop_workqueue); |
3703b2c5 NB |
1477 | } |
1478 | ||
1479 | MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); | |
1480 | MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>"); | |
1481 | MODULE_LICENSE("GPL"); | |
1482 | module_init(tcm_loop_fabric_init); | |
1483 | module_exit(tcm_loop_fabric_exit); |