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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 | |
214 | * SCF_SCSI_CONTROL_SG_IO_CDB. Also note that this is currently | |
215 | * guaranteed to be a single SGL for SCF_SCSI_CONTROL_SG_IO_CDB | |
216 | * by target core in transport_generic_allocate_tasks() -> | |
217 | * transport_generic_cmd_sequencer(). | |
218 | */ | |
219 | if (se_cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB && | |
220 | se_cmd->data_direction == DMA_FROM_DEVICE) { | |
221 | struct scatterlist *sg = scsi_sglist(sc); | |
222 | unsigned char *buf = kmap(sg_page(sg)) + sg->offset; | |
223 | ||
224 | if (buf != NULL) { | |
225 | memset(buf, 0, sg->length); | |
226 | kunmap(sg_page(sg)); | |
227 | } | |
228 | } | |
229 | ||
230 | ret = transport_generic_allocate_tasks(se_cmd, sc->cmnd); | |
231 | if (ret == -ENOMEM) { | |
232 | transport_send_check_condition_and_sense(se_cmd, | |
233 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); | |
234 | transport_generic_free_cmd(se_cmd, 0); | |
235 | return; | |
ee9b866a | 236 | } else if (ret < 0) { |
16786454 CH |
237 | if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT) |
238 | tcm_loop_queue_status(se_cmd); | |
239 | else | |
240 | transport_send_check_condition_and_sense(se_cmd, | |
241 | se_cmd->scsi_sense_reason, 0); | |
242 | transport_generic_free_cmd(se_cmd, 0); | |
243 | return; | |
244 | } | |
245 | ||
246 | ret = transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc), | |
247 | scsi_sg_count(sc), sgl_bidi, sgl_bidi_count); | |
248 | if (ret) { | |
249 | transport_send_check_condition_and_sense(se_cmd, | |
250 | se_cmd->scsi_sense_reason, 0); | |
251 | transport_generic_free_cmd(se_cmd, 0); | |
252 | return; | |
253 | } | |
254 | transport_handle_cdb_direct(se_cmd); | |
afe2cb7f | 255 | return; |
f872c9f4 CH |
256 | |
257 | out_done: | |
258 | sc->scsi_done(sc); | |
afe2cb7f CH |
259 | return; |
260 | } | |
261 | ||
262 | /* | |
263 | * ->queuecommand can be and usually is called from interrupt context, so | |
264 | * defer the actual submission to a workqueue. | |
265 | */ | |
266 | static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc) | |
267 | { | |
268 | struct tcm_loop_cmd *tl_cmd; | |
269 | ||
270 | pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x" | |
271 | " scsi_buf_len: %u\n", sc->device->host->host_no, | |
272 | sc->device->id, sc->device->channel, sc->device->lun, | |
273 | sc->cmnd[0], scsi_bufflen(sc)); | |
274 | ||
275 | tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC); | |
276 | if (!tl_cmd) { | |
277 | pr_err("Unable to allocate struct tcm_loop_cmd\n"); | |
278 | set_host_byte(sc, DID_ERROR); | |
279 | sc->scsi_done(sc); | |
280 | return 0; | |
281 | } | |
282 | ||
283 | tl_cmd->sc = sc; | |
284 | INIT_WORK(&tl_cmd->work, tcm_loop_submission_work); | |
285 | queue_work(tcm_loop_workqueue, &tl_cmd->work); | |
f872c9f4 | 286 | return 0; |
3703b2c5 NB |
287 | } |
288 | ||
289 | /* | |
290 | * Called from SCSI EH process context to issue a LUN_RESET TMR | |
291 | * to struct scsi_device | |
292 | */ | |
293 | static int tcm_loop_device_reset(struct scsi_cmnd *sc) | |
294 | { | |
295 | struct se_cmd *se_cmd = NULL; | |
296 | struct se_portal_group *se_tpg; | |
297 | struct se_session *se_sess; | |
298 | struct tcm_loop_cmd *tl_cmd = NULL; | |
299 | struct tcm_loop_hba *tl_hba; | |
300 | struct tcm_loop_nexus *tl_nexus; | |
301 | struct tcm_loop_tmr *tl_tmr = NULL; | |
302 | struct tcm_loop_tpg *tl_tpg; | |
c8e31f26 | 303 | int ret = FAILED, rc; |
3703b2c5 NB |
304 | /* |
305 | * Locate the tcm_loop_hba_t pointer | |
306 | */ | |
307 | tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); | |
308 | /* | |
309 | * Locate the tl_nexus and se_sess pointers | |
310 | */ | |
311 | tl_nexus = tl_hba->tl_nexus; | |
312 | if (!tl_nexus) { | |
6708bb27 | 313 | pr_err("Unable to perform device reset without" |
3703b2c5 NB |
314 | " active I_T Nexus\n"); |
315 | return FAILED; | |
316 | } | |
317 | se_sess = tl_nexus->se_sess; | |
318 | /* | |
319 | * Locate the tl_tpg and se_tpg pointers from TargetID in sc->device->id | |
320 | */ | |
321 | tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; | |
322 | se_tpg = &tl_tpg->tl_se_tpg; | |
323 | ||
324 | tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); | |
325 | if (!tl_cmd) { | |
6708bb27 | 326 | pr_err("Unable to allocate memory for tl_cmd\n"); |
3703b2c5 NB |
327 | return FAILED; |
328 | } | |
329 | ||
330 | tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL); | |
331 | if (!tl_tmr) { | |
6708bb27 | 332 | pr_err("Unable to allocate memory for tl_tmr\n"); |
3703b2c5 NB |
333 | goto release; |
334 | } | |
335 | init_waitqueue_head(&tl_tmr->tl_tmr_wait); | |
336 | ||
337 | se_cmd = &tl_cmd->tl_se_cmd; | |
338 | /* | |
339 | * Initialize struct se_cmd descriptor from target_core_mod infrastructure | |
340 | */ | |
341 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0, | |
61db1802 | 342 | DMA_NONE, MSG_SIMPLE_TAG, |
3703b2c5 | 343 | &tl_cmd->tl_sense_buf[0]); |
c8e31f26 AG |
344 | |
345 | rc = core_tmr_alloc_req(se_cmd, tl_tmr, TMR_LUN_RESET, GFP_KERNEL); | |
346 | if (rc < 0) | |
3703b2c5 NB |
347 | goto release; |
348 | /* | |
349 | * Locate the underlying TCM struct se_lun from sc->device->lun | |
350 | */ | |
5951146d | 351 | if (transport_lookup_tmr_lun(se_cmd, sc->device->lun) < 0) |
3703b2c5 NB |
352 | goto release; |
353 | /* | |
354 | * Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp() | |
355 | * to wake us up. | |
356 | */ | |
357 | transport_generic_handle_tmr(se_cmd); | |
358 | wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete)); | |
359 | /* | |
360 | * The TMR LUN_RESET has completed, check the response status and | |
361 | * then release allocations. | |
362 | */ | |
363 | ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? | |
364 | SUCCESS : FAILED; | |
365 | release: | |
366 | if (se_cmd) | |
82f1c8a4 | 367 | transport_generic_free_cmd(se_cmd, 1); |
3703b2c5 NB |
368 | else |
369 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); | |
370 | kfree(tl_tmr); | |
371 | return ret; | |
372 | } | |
373 | ||
374 | static int tcm_loop_slave_alloc(struct scsi_device *sd) | |
375 | { | |
376 | set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags); | |
377 | return 0; | |
378 | } | |
379 | ||
380 | static int tcm_loop_slave_configure(struct scsi_device *sd) | |
381 | { | |
382 | return 0; | |
383 | } | |
384 | ||
385 | static struct scsi_host_template tcm_loop_driver_template = { | |
386 | .proc_info = tcm_loop_proc_info, | |
387 | .proc_name = "tcm_loopback", | |
388 | .name = "TCM_Loopback", | |
389 | .queuecommand = tcm_loop_queuecommand, | |
390 | .change_queue_depth = tcm_loop_change_queue_depth, | |
391 | .eh_device_reset_handler = tcm_loop_device_reset, | |
2e88efd3 | 392 | .can_queue = 1024, |
3703b2c5 | 393 | .this_id = -1, |
2e88efd3 CH |
394 | .sg_tablesize = 256, |
395 | .cmd_per_lun = 1024, | |
396 | .max_sectors = 0xFFFF, | |
3703b2c5 NB |
397 | .use_clustering = DISABLE_CLUSTERING, |
398 | .slave_alloc = tcm_loop_slave_alloc, | |
399 | .slave_configure = tcm_loop_slave_configure, | |
400 | .module = THIS_MODULE, | |
401 | }; | |
402 | ||
403 | static int tcm_loop_driver_probe(struct device *dev) | |
404 | { | |
405 | struct tcm_loop_hba *tl_hba; | |
406 | struct Scsi_Host *sh; | |
407 | int error; | |
408 | ||
409 | tl_hba = to_tcm_loop_hba(dev); | |
410 | ||
411 | sh = scsi_host_alloc(&tcm_loop_driver_template, | |
412 | sizeof(struct tcm_loop_hba)); | |
413 | if (!sh) { | |
6708bb27 | 414 | pr_err("Unable to allocate struct scsi_host\n"); |
3703b2c5 NB |
415 | return -ENODEV; |
416 | } | |
417 | tl_hba->sh = sh; | |
418 | ||
419 | /* | |
420 | * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata | |
421 | */ | |
422 | *((struct tcm_loop_hba **)sh->hostdata) = tl_hba; | |
423 | /* | |
424 | * Setup single ID, Channel and LUN for now.. | |
425 | */ | |
426 | sh->max_id = 2; | |
427 | sh->max_lun = 0; | |
428 | sh->max_channel = 0; | |
429 | sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN; | |
430 | ||
431 | error = scsi_add_host(sh, &tl_hba->dev); | |
432 | if (error) { | |
6708bb27 | 433 | pr_err("%s: scsi_add_host failed\n", __func__); |
3703b2c5 NB |
434 | scsi_host_put(sh); |
435 | return -ENODEV; | |
436 | } | |
437 | return 0; | |
438 | } | |
439 | ||
440 | static int tcm_loop_driver_remove(struct device *dev) | |
441 | { | |
442 | struct tcm_loop_hba *tl_hba; | |
443 | struct Scsi_Host *sh; | |
444 | ||
445 | tl_hba = to_tcm_loop_hba(dev); | |
446 | sh = tl_hba->sh; | |
447 | ||
448 | scsi_remove_host(sh); | |
449 | scsi_host_put(sh); | |
450 | return 0; | |
451 | } | |
452 | ||
453 | static void tcm_loop_release_adapter(struct device *dev) | |
454 | { | |
455 | struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev); | |
456 | ||
457 | kfree(tl_hba); | |
458 | } | |
459 | ||
460 | /* | |
461 | * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c | |
462 | */ | |
463 | static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id) | |
464 | { | |
465 | int ret; | |
466 | ||
467 | tl_hba->dev.bus = &tcm_loop_lld_bus; | |
468 | tl_hba->dev.parent = tcm_loop_primary; | |
469 | tl_hba->dev.release = &tcm_loop_release_adapter; | |
470 | dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id); | |
471 | ||
472 | ret = device_register(&tl_hba->dev); | |
473 | if (ret) { | |
6708bb27 | 474 | pr_err("device_register() failed for" |
3703b2c5 NB |
475 | " tl_hba->dev: %d\n", ret); |
476 | return -ENODEV; | |
477 | } | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
482 | /* | |
483 | * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated | |
484 | * tcm_loop SCSI bus. | |
485 | */ | |
486 | static int tcm_loop_alloc_core_bus(void) | |
487 | { | |
488 | int ret; | |
489 | ||
490 | tcm_loop_primary = root_device_register("tcm_loop_0"); | |
491 | if (IS_ERR(tcm_loop_primary)) { | |
6708bb27 | 492 | pr_err("Unable to allocate tcm_loop_primary\n"); |
3703b2c5 NB |
493 | return PTR_ERR(tcm_loop_primary); |
494 | } | |
495 | ||
496 | ret = bus_register(&tcm_loop_lld_bus); | |
497 | if (ret) { | |
6708bb27 | 498 | pr_err("bus_register() failed for tcm_loop_lld_bus\n"); |
3703b2c5 NB |
499 | goto dev_unreg; |
500 | } | |
501 | ||
502 | ret = driver_register(&tcm_loop_driverfs); | |
503 | if (ret) { | |
6708bb27 | 504 | pr_err("driver_register() failed for" |
3703b2c5 NB |
505 | "tcm_loop_driverfs\n"); |
506 | goto bus_unreg; | |
507 | } | |
508 | ||
6708bb27 | 509 | pr_debug("Initialized TCM Loop Core Bus\n"); |
3703b2c5 NB |
510 | return ret; |
511 | ||
512 | bus_unreg: | |
513 | bus_unregister(&tcm_loop_lld_bus); | |
514 | dev_unreg: | |
515 | root_device_unregister(tcm_loop_primary); | |
516 | return ret; | |
517 | } | |
518 | ||
519 | static void tcm_loop_release_core_bus(void) | |
520 | { | |
521 | driver_unregister(&tcm_loop_driverfs); | |
522 | bus_unregister(&tcm_loop_lld_bus); | |
523 | root_device_unregister(tcm_loop_primary); | |
524 | ||
6708bb27 | 525 | pr_debug("Releasing TCM Loop Core BUS\n"); |
3703b2c5 NB |
526 | } |
527 | ||
528 | static char *tcm_loop_get_fabric_name(void) | |
529 | { | |
530 | return "loopback"; | |
531 | } | |
532 | ||
533 | static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg) | |
534 | { | |
8359cf43 | 535 | struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; |
3703b2c5 NB |
536 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; |
537 | /* | |
538 | * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba() | |
539 | * time based on the protocol dependent prefix of the passed configfs group. | |
540 | * | |
541 | * Based upon tl_proto_id, TCM_Loop emulates the requested fabric | |
542 | * ProtocolID using target_core_fabric_lib.c symbols. | |
543 | */ | |
544 | switch (tl_hba->tl_proto_id) { | |
545 | case SCSI_PROTOCOL_SAS: | |
546 | return sas_get_fabric_proto_ident(se_tpg); | |
547 | case SCSI_PROTOCOL_FCP: | |
548 | return fc_get_fabric_proto_ident(se_tpg); | |
549 | case SCSI_PROTOCOL_ISCSI: | |
550 | return iscsi_get_fabric_proto_ident(se_tpg); | |
551 | default: | |
6708bb27 | 552 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
553 | " SAS emulation\n", tl_hba->tl_proto_id); |
554 | break; | |
555 | } | |
556 | ||
557 | return sas_get_fabric_proto_ident(se_tpg); | |
558 | } | |
559 | ||
560 | static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg) | |
561 | { | |
8359cf43 | 562 | struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; |
3703b2c5 NB |
563 | /* |
564 | * Return the passed NAA identifier for the SAS Target Port | |
565 | */ | |
566 | return &tl_tpg->tl_hba->tl_wwn_address[0]; | |
567 | } | |
568 | ||
569 | static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg) | |
570 | { | |
8359cf43 | 571 | struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; |
3703b2c5 NB |
572 | /* |
573 | * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 | |
574 | * to represent the SCSI Target Port. | |
575 | */ | |
576 | return tl_tpg->tl_tpgt; | |
577 | } | |
578 | ||
579 | static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg) | |
580 | { | |
581 | return 1; | |
582 | } | |
583 | ||
584 | static u32 tcm_loop_get_pr_transport_id( | |
585 | struct se_portal_group *se_tpg, | |
586 | struct se_node_acl *se_nacl, | |
587 | struct t10_pr_registration *pr_reg, | |
588 | int *format_code, | |
589 | unsigned char *buf) | |
590 | { | |
8359cf43 | 591 | struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; |
3703b2c5 NB |
592 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; |
593 | ||
594 | switch (tl_hba->tl_proto_id) { | |
595 | case SCSI_PROTOCOL_SAS: | |
596 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
597 | format_code, buf); | |
598 | case SCSI_PROTOCOL_FCP: | |
599 | return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
600 | format_code, buf); | |
601 | case SCSI_PROTOCOL_ISCSI: | |
602 | return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
603 | format_code, buf); | |
604 | default: | |
6708bb27 | 605 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
606 | " SAS emulation\n", tl_hba->tl_proto_id); |
607 | break; | |
608 | } | |
609 | ||
610 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
611 | format_code, buf); | |
612 | } | |
613 | ||
614 | static u32 tcm_loop_get_pr_transport_id_len( | |
615 | struct se_portal_group *se_tpg, | |
616 | struct se_node_acl *se_nacl, | |
617 | struct t10_pr_registration *pr_reg, | |
618 | int *format_code) | |
619 | { | |
8359cf43 | 620 | struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; |
3703b2c5 NB |
621 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; |
622 | ||
623 | switch (tl_hba->tl_proto_id) { | |
624 | case SCSI_PROTOCOL_SAS: | |
625 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
626 | format_code); | |
627 | case SCSI_PROTOCOL_FCP: | |
628 | return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
629 | format_code); | |
630 | case SCSI_PROTOCOL_ISCSI: | |
631 | return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
632 | format_code); | |
633 | default: | |
6708bb27 | 634 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
635 | " SAS emulation\n", tl_hba->tl_proto_id); |
636 | break; | |
637 | } | |
638 | ||
639 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
640 | format_code); | |
641 | } | |
642 | ||
643 | /* | |
644 | * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above | |
645 | * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. | |
646 | */ | |
647 | static char *tcm_loop_parse_pr_out_transport_id( | |
648 | struct se_portal_group *se_tpg, | |
649 | const char *buf, | |
650 | u32 *out_tid_len, | |
651 | char **port_nexus_ptr) | |
652 | { | |
8359cf43 | 653 | struct tcm_loop_tpg *tl_tpg = se_tpg->se_tpg_fabric_ptr; |
3703b2c5 NB |
654 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; |
655 | ||
656 | switch (tl_hba->tl_proto_id) { | |
657 | case SCSI_PROTOCOL_SAS: | |
658 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
659 | port_nexus_ptr); | |
660 | case SCSI_PROTOCOL_FCP: | |
661 | return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
662 | port_nexus_ptr); | |
663 | case SCSI_PROTOCOL_ISCSI: | |
664 | return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
665 | port_nexus_ptr); | |
666 | default: | |
6708bb27 | 667 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
668 | " SAS emulation\n", tl_hba->tl_proto_id); |
669 | break; | |
670 | } | |
671 | ||
672 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
673 | port_nexus_ptr); | |
674 | } | |
675 | ||
676 | /* | |
677 | * Returning (1) here allows for target_core_mod struct se_node_acl to be generated | |
678 | * based upon the incoming fabric dependent SCSI Initiator Port | |
679 | */ | |
680 | static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) | |
681 | { | |
682 | return 1; | |
683 | } | |
684 | ||
685 | static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) | |
686 | { | |
687 | return 0; | |
688 | } | |
689 | ||
690 | /* | |
691 | * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for | |
692 | * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest | |
693 | */ | |
694 | static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) | |
695 | { | |
696 | return 0; | |
697 | } | |
698 | ||
699 | /* | |
700 | * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will | |
701 | * never be called for TCM_Loop by target_core_fabric_configfs.c code. | |
702 | * It has been added here as a nop for target_fabric_tf_ops_check() | |
703 | */ | |
704 | static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) | |
705 | { | |
706 | return 0; | |
707 | } | |
708 | ||
709 | static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl( | |
710 | struct se_portal_group *se_tpg) | |
711 | { | |
712 | struct tcm_loop_nacl *tl_nacl; | |
713 | ||
714 | tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL); | |
715 | if (!tl_nacl) { | |
6708bb27 | 716 | pr_err("Unable to allocate struct tcm_loop_nacl\n"); |
3703b2c5 NB |
717 | return NULL; |
718 | } | |
719 | ||
720 | return &tl_nacl->se_node_acl; | |
721 | } | |
722 | ||
723 | static void tcm_loop_tpg_release_fabric_acl( | |
724 | struct se_portal_group *se_tpg, | |
725 | struct se_node_acl *se_nacl) | |
726 | { | |
727 | struct tcm_loop_nacl *tl_nacl = container_of(se_nacl, | |
728 | struct tcm_loop_nacl, se_node_acl); | |
729 | ||
730 | kfree(tl_nacl); | |
731 | } | |
732 | ||
733 | static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) | |
734 | { | |
735 | return 1; | |
736 | } | |
737 | ||
3703b2c5 NB |
738 | static u32 tcm_loop_sess_get_index(struct se_session *se_sess) |
739 | { | |
740 | return 1; | |
741 | } | |
742 | ||
743 | static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) | |
744 | { | |
745 | return; | |
746 | } | |
747 | ||
748 | static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd) | |
749 | { | |
750 | return 1; | |
751 | } | |
752 | ||
753 | static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) | |
754 | { | |
755 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
756 | struct tcm_loop_cmd, tl_se_cmd); | |
757 | ||
758 | return tl_cmd->sc_cmd_state; | |
759 | } | |
760 | ||
761 | static int tcm_loop_shutdown_session(struct se_session *se_sess) | |
762 | { | |
763 | return 0; | |
764 | } | |
765 | ||
766 | static void tcm_loop_close_session(struct se_session *se_sess) | |
767 | { | |
768 | return; | |
769 | }; | |
770 | ||
3703b2c5 NB |
771 | static int tcm_loop_write_pending(struct se_cmd *se_cmd) |
772 | { | |
773 | /* | |
774 | * Since Linux/SCSI has already sent down a struct scsi_cmnd | |
775 | * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array | |
776 | * memory, and memory has already been mapped to struct se_cmd->t_mem_list | |
777 | * format with transport_generic_map_mem_to_cmd(). | |
778 | * | |
779 | * We now tell TCM to add this WRITE CDB directly into the TCM storage | |
780 | * object execution queue. | |
781 | */ | |
782 | transport_generic_process_write(se_cmd); | |
783 | return 0; | |
784 | } | |
785 | ||
786 | static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) | |
787 | { | |
788 | return 0; | |
789 | } | |
790 | ||
791 | static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) | |
792 | { | |
793 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
794 | struct tcm_loop_cmd, tl_se_cmd); | |
795 | struct scsi_cmnd *sc = tl_cmd->sc; | |
796 | ||
6708bb27 | 797 | pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" |
3703b2c5 NB |
798 | " cdb: 0x%02x\n", sc, sc->cmnd[0]); |
799 | ||
800 | sc->result = SAM_STAT_GOOD; | |
801 | set_host_byte(sc, DID_OK); | |
6cf3fa69 RD |
802 | if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || |
803 | (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) | |
804 | scsi_set_resid(sc, se_cmd->residual_count); | |
3703b2c5 NB |
805 | sc->scsi_done(sc); |
806 | return 0; | |
807 | } | |
808 | ||
809 | static int tcm_loop_queue_status(struct se_cmd *se_cmd) | |
810 | { | |
811 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
812 | struct tcm_loop_cmd, tl_se_cmd); | |
813 | struct scsi_cmnd *sc = tl_cmd->sc; | |
814 | ||
6708bb27 | 815 | pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" |
3703b2c5 NB |
816 | " cdb: 0x%02x\n", sc, sc->cmnd[0]); |
817 | ||
818 | if (se_cmd->sense_buffer && | |
819 | ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || | |
820 | (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { | |
821 | ||
5951146d | 822 | memcpy(sc->sense_buffer, se_cmd->sense_buffer, |
3703b2c5 NB |
823 | SCSI_SENSE_BUFFERSIZE); |
824 | sc->result = SAM_STAT_CHECK_CONDITION; | |
825 | set_driver_byte(sc, DRIVER_SENSE); | |
826 | } else | |
827 | sc->result = se_cmd->scsi_status; | |
828 | ||
829 | set_host_byte(sc, DID_OK); | |
6cf3fa69 RD |
830 | if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || |
831 | (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) | |
832 | scsi_set_resid(sc, se_cmd->residual_count); | |
3703b2c5 NB |
833 | sc->scsi_done(sc); |
834 | return 0; | |
835 | } | |
836 | ||
837 | static int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) | |
838 | { | |
839 | struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; | |
840 | struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; | |
841 | /* | |
842 | * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead | |
843 | * and wake up the wait_queue_head_t in tcm_loop_device_reset() | |
844 | */ | |
845 | atomic_set(&tl_tmr->tmr_complete, 1); | |
846 | wake_up(&tl_tmr->tl_tmr_wait); | |
847 | return 0; | |
848 | } | |
849 | ||
850 | static u16 tcm_loop_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length) | |
851 | { | |
852 | return 0; | |
853 | } | |
854 | ||
855 | static u16 tcm_loop_get_fabric_sense_len(void) | |
856 | { | |
857 | return 0; | |
858 | } | |
859 | ||
3703b2c5 NB |
860 | static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) |
861 | { | |
862 | switch (tl_hba->tl_proto_id) { | |
863 | case SCSI_PROTOCOL_SAS: | |
864 | return "SAS"; | |
865 | case SCSI_PROTOCOL_FCP: | |
866 | return "FCP"; | |
867 | case SCSI_PROTOCOL_ISCSI: | |
868 | return "iSCSI"; | |
869 | default: | |
870 | break; | |
871 | } | |
872 | ||
873 | return "Unknown"; | |
874 | } | |
875 | ||
876 | /* Start items for tcm_loop_port_cit */ | |
877 | ||
878 | static int tcm_loop_port_link( | |
879 | struct se_portal_group *se_tpg, | |
880 | struct se_lun *lun) | |
881 | { | |
882 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
883 | struct tcm_loop_tpg, tl_se_tpg); | |
884 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
885 | ||
886 | atomic_inc(&tl_tpg->tl_tpg_port_count); | |
887 | smp_mb__after_atomic_inc(); | |
888 | /* | |
889 | * Add Linux/SCSI struct scsi_device by HCTL | |
890 | */ | |
891 | scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); | |
892 | ||
6708bb27 | 893 | pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); |
3703b2c5 NB |
894 | return 0; |
895 | } | |
896 | ||
897 | static void tcm_loop_port_unlink( | |
898 | struct se_portal_group *se_tpg, | |
899 | struct se_lun *se_lun) | |
900 | { | |
901 | struct scsi_device *sd; | |
902 | struct tcm_loop_hba *tl_hba; | |
903 | struct tcm_loop_tpg *tl_tpg; | |
904 | ||
905 | tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); | |
906 | tl_hba = tl_tpg->tl_hba; | |
907 | ||
908 | sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, | |
909 | se_lun->unpacked_lun); | |
910 | if (!sd) { | |
6708bb27 | 911 | pr_err("Unable to locate struct scsi_device for %d:%d:" |
3703b2c5 NB |
912 | "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); |
913 | return; | |
914 | } | |
915 | /* | |
916 | * Remove Linux/SCSI struct scsi_device by HCTL | |
917 | */ | |
918 | scsi_remove_device(sd); | |
919 | scsi_device_put(sd); | |
920 | ||
921 | atomic_dec(&tl_tpg->tl_tpg_port_count); | |
922 | smp_mb__after_atomic_dec(); | |
923 | ||
6708bb27 | 924 | pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); |
3703b2c5 NB |
925 | } |
926 | ||
927 | /* End items for tcm_loop_port_cit */ | |
928 | ||
929 | /* Start items for tcm_loop_nexus_cit */ | |
930 | ||
931 | static int tcm_loop_make_nexus( | |
932 | struct tcm_loop_tpg *tl_tpg, | |
933 | const char *name) | |
934 | { | |
935 | struct se_portal_group *se_tpg; | |
936 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
937 | struct tcm_loop_nexus *tl_nexus; | |
552523dc | 938 | int ret = -ENOMEM; |
3703b2c5 NB |
939 | |
940 | if (tl_tpg->tl_hba->tl_nexus) { | |
6708bb27 | 941 | pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n"); |
3703b2c5 NB |
942 | return -EEXIST; |
943 | } | |
944 | se_tpg = &tl_tpg->tl_se_tpg; | |
945 | ||
946 | tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); | |
947 | if (!tl_nexus) { | |
6708bb27 | 948 | pr_err("Unable to allocate struct tcm_loop_nexus\n"); |
3703b2c5 NB |
949 | return -ENOMEM; |
950 | } | |
951 | /* | |
952 | * Initialize the struct se_session pointer | |
953 | */ | |
954 | tl_nexus->se_sess = transport_init_session(); | |
552523dc DC |
955 | if (IS_ERR(tl_nexus->se_sess)) { |
956 | ret = PTR_ERR(tl_nexus->se_sess); | |
3703b2c5 | 957 | goto out; |
552523dc | 958 | } |
3703b2c5 NB |
959 | /* |
960 | * Since we are running in 'demo mode' this call with generate a | |
961 | * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI | |
962 | * Initiator port name of the passed configfs group 'name'. | |
963 | */ | |
964 | tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
965 | se_tpg, (unsigned char *)name); | |
966 | if (!tl_nexus->se_sess->se_node_acl) { | |
967 | transport_free_session(tl_nexus->se_sess); | |
968 | goto out; | |
969 | } | |
970 | /* | |
971 | * Now, register the SAS I_T Nexus as active with the call to | |
972 | * transport_register_session() | |
973 | */ | |
974 | __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, | |
5951146d | 975 | tl_nexus->se_sess, tl_nexus); |
3703b2c5 | 976 | tl_tpg->tl_hba->tl_nexus = tl_nexus; |
6708bb27 | 977 | pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" |
3703b2c5 NB |
978 | " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), |
979 | name); | |
980 | return 0; | |
981 | ||
982 | out: | |
983 | kfree(tl_nexus); | |
552523dc | 984 | return ret; |
3703b2c5 NB |
985 | } |
986 | ||
987 | static int tcm_loop_drop_nexus( | |
988 | struct tcm_loop_tpg *tpg) | |
989 | { | |
990 | struct se_session *se_sess; | |
991 | struct tcm_loop_nexus *tl_nexus; | |
992 | struct tcm_loop_hba *tl_hba = tpg->tl_hba; | |
993 | ||
994 | tl_nexus = tpg->tl_hba->tl_nexus; | |
995 | if (!tl_nexus) | |
996 | return -ENODEV; | |
997 | ||
998 | se_sess = tl_nexus->se_sess; | |
999 | if (!se_sess) | |
1000 | return -ENODEV; | |
1001 | ||
1002 | if (atomic_read(&tpg->tl_tpg_port_count)) { | |
6708bb27 | 1003 | pr_err("Unable to remove TCM_Loop I_T Nexus with" |
3703b2c5 NB |
1004 | " active TPG port count: %d\n", |
1005 | atomic_read(&tpg->tl_tpg_port_count)); | |
1006 | return -EPERM; | |
1007 | } | |
1008 | ||
6708bb27 | 1009 | pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" |
3703b2c5 NB |
1010 | " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), |
1011 | tl_nexus->se_sess->se_node_acl->initiatorname); | |
1012 | /* | |
1013 | * Release the SCSI I_T Nexus to the emulated SAS Target Port | |
1014 | */ | |
1015 | transport_deregister_session(tl_nexus->se_sess); | |
1016 | tpg->tl_hba->tl_nexus = NULL; | |
1017 | kfree(tl_nexus); | |
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | /* End items for tcm_loop_nexus_cit */ | |
1022 | ||
1023 | static ssize_t tcm_loop_tpg_show_nexus( | |
1024 | struct se_portal_group *se_tpg, | |
1025 | char *page) | |
1026 | { | |
1027 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1028 | struct tcm_loop_tpg, tl_se_tpg); | |
1029 | struct tcm_loop_nexus *tl_nexus; | |
1030 | ssize_t ret; | |
1031 | ||
1032 | tl_nexus = tl_tpg->tl_hba->tl_nexus; | |
1033 | if (!tl_nexus) | |
1034 | return -ENODEV; | |
1035 | ||
1036 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1037 | tl_nexus->se_sess->se_node_acl->initiatorname); | |
1038 | ||
1039 | return ret; | |
1040 | } | |
1041 | ||
1042 | static ssize_t tcm_loop_tpg_store_nexus( | |
1043 | struct se_portal_group *se_tpg, | |
1044 | const char *page, | |
1045 | size_t count) | |
1046 | { | |
1047 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1048 | struct tcm_loop_tpg, tl_se_tpg); | |
1049 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
1050 | unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; | |
1051 | int ret; | |
1052 | /* | |
1053 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
1054 | */ | |
1055 | if (!strncmp(page, "NULL", 4)) { | |
1056 | ret = tcm_loop_drop_nexus(tl_tpg); | |
1057 | return (!ret) ? count : ret; | |
1058 | } | |
1059 | /* | |
1060 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1061 | * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call | |
1062 | * tcm_loop_make_nexus() | |
1063 | */ | |
60d645a4 | 1064 | if (strlen(page) >= TL_WWN_ADDR_LEN) { |
6708bb27 | 1065 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
3703b2c5 NB |
1066 | " max: %d\n", page, TL_WWN_ADDR_LEN); |
1067 | return -EINVAL; | |
1068 | } | |
1069 | snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); | |
1070 | ||
1071 | ptr = strstr(i_port, "naa."); | |
1072 | if (ptr) { | |
1073 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { | |
6708bb27 | 1074 | pr_err("Passed SAS Initiator Port %s does not" |
3703b2c5 NB |
1075 | " match target port protoid: %s\n", i_port, |
1076 | tcm_loop_dump_proto_id(tl_hba)); | |
1077 | return -EINVAL; | |
1078 | } | |
1079 | port_ptr = &i_port[0]; | |
1080 | goto check_newline; | |
1081 | } | |
1082 | ptr = strstr(i_port, "fc."); | |
1083 | if (ptr) { | |
1084 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { | |
6708bb27 | 1085 | pr_err("Passed FCP Initiator Port %s does not" |
3703b2c5 NB |
1086 | " match target port protoid: %s\n", i_port, |
1087 | tcm_loop_dump_proto_id(tl_hba)); | |
1088 | return -EINVAL; | |
1089 | } | |
1090 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1091 | goto check_newline; | |
1092 | } | |
1093 | ptr = strstr(i_port, "iqn."); | |
1094 | if (ptr) { | |
1095 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { | |
6708bb27 | 1096 | pr_err("Passed iSCSI Initiator Port %s does not" |
3703b2c5 NB |
1097 | " match target port protoid: %s\n", i_port, |
1098 | tcm_loop_dump_proto_id(tl_hba)); | |
1099 | return -EINVAL; | |
1100 | } | |
1101 | port_ptr = &i_port[0]; | |
1102 | goto check_newline; | |
1103 | } | |
6708bb27 | 1104 | pr_err("Unable to locate prefix for emulated Initiator Port:" |
3703b2c5 NB |
1105 | " %s\n", i_port); |
1106 | return -EINVAL; | |
1107 | /* | |
1108 | * Clear any trailing newline for the NAA WWN | |
1109 | */ | |
1110 | check_newline: | |
1111 | if (i_port[strlen(i_port)-1] == '\n') | |
1112 | i_port[strlen(i_port)-1] = '\0'; | |
1113 | ||
1114 | ret = tcm_loop_make_nexus(tl_tpg, port_ptr); | |
1115 | if (ret < 0) | |
1116 | return ret; | |
1117 | ||
1118 | return count; | |
1119 | } | |
1120 | ||
1121 | TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); | |
1122 | ||
1123 | static struct configfs_attribute *tcm_loop_tpg_attrs[] = { | |
1124 | &tcm_loop_tpg_nexus.attr, | |
1125 | NULL, | |
1126 | }; | |
1127 | ||
1128 | /* Start items for tcm_loop_naa_cit */ | |
1129 | ||
1130 | struct se_portal_group *tcm_loop_make_naa_tpg( | |
1131 | struct se_wwn *wwn, | |
1132 | struct config_group *group, | |
1133 | const char *name) | |
1134 | { | |
1135 | struct tcm_loop_hba *tl_hba = container_of(wwn, | |
1136 | struct tcm_loop_hba, tl_hba_wwn); | |
1137 | struct tcm_loop_tpg *tl_tpg; | |
1138 | char *tpgt_str, *end_ptr; | |
1139 | int ret; | |
1140 | unsigned short int tpgt; | |
1141 | ||
1142 | tpgt_str = strstr(name, "tpgt_"); | |
1143 | if (!tpgt_str) { | |
6708bb27 | 1144 | pr_err("Unable to locate \"tpgt_#\" directory" |
3703b2c5 NB |
1145 | " group\n"); |
1146 | return ERR_PTR(-EINVAL); | |
1147 | } | |
1148 | tpgt_str += 5; /* Skip ahead of "tpgt_" */ | |
1149 | tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0); | |
1150 | ||
12f09ccb | 1151 | if (tpgt >= TL_TPGS_PER_HBA) { |
6708bb27 | 1152 | pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:" |
3703b2c5 NB |
1153 | " %u\n", tpgt, TL_TPGS_PER_HBA); |
1154 | return ERR_PTR(-EINVAL); | |
1155 | } | |
1156 | tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; | |
1157 | tl_tpg->tl_hba = tl_hba; | |
1158 | tl_tpg->tl_tpgt = tpgt; | |
1159 | /* | |
1160 | * Register the tl_tpg as a emulated SAS TCM Target Endpoint | |
1161 | */ | |
1162 | ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops, | |
5951146d | 1163 | wwn, &tl_tpg->tl_se_tpg, tl_tpg, |
3703b2c5 NB |
1164 | TRANSPORT_TPG_TYPE_NORMAL); |
1165 | if (ret < 0) | |
1166 | return ERR_PTR(-ENOMEM); | |
1167 | ||
6708bb27 | 1168 | pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" |
3703b2c5 NB |
1169 | " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), |
1170 | config_item_name(&wwn->wwn_group.cg_item), tpgt); | |
1171 | ||
1172 | return &tl_tpg->tl_se_tpg; | |
1173 | } | |
1174 | ||
1175 | void tcm_loop_drop_naa_tpg( | |
1176 | struct se_portal_group *se_tpg) | |
1177 | { | |
1178 | struct se_wwn *wwn = se_tpg->se_tpg_wwn; | |
1179 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1180 | struct tcm_loop_tpg, tl_se_tpg); | |
1181 | struct tcm_loop_hba *tl_hba; | |
1182 | unsigned short tpgt; | |
1183 | ||
1184 | tl_hba = tl_tpg->tl_hba; | |
1185 | tpgt = tl_tpg->tl_tpgt; | |
1186 | /* | |
1187 | * Release the I_T Nexus for the Virtual SAS link if present | |
1188 | */ | |
1189 | tcm_loop_drop_nexus(tl_tpg); | |
1190 | /* | |
1191 | * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint | |
1192 | */ | |
1193 | core_tpg_deregister(se_tpg); | |
1194 | ||
0a020436 NB |
1195 | tl_tpg->tl_hba = NULL; |
1196 | tl_tpg->tl_tpgt = 0; | |
1197 | ||
6708bb27 | 1198 | pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" |
3703b2c5 NB |
1199 | " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), |
1200 | config_item_name(&wwn->wwn_group.cg_item), tpgt); | |
1201 | } | |
1202 | ||
1203 | /* End items for tcm_loop_naa_cit */ | |
1204 | ||
1205 | /* Start items for tcm_loop_cit */ | |
1206 | ||
1207 | struct se_wwn *tcm_loop_make_scsi_hba( | |
1208 | struct target_fabric_configfs *tf, | |
1209 | struct config_group *group, | |
1210 | const char *name) | |
1211 | { | |
1212 | struct tcm_loop_hba *tl_hba; | |
1213 | struct Scsi_Host *sh; | |
1214 | char *ptr; | |
1215 | int ret, off = 0; | |
1216 | ||
1217 | tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); | |
1218 | if (!tl_hba) { | |
6708bb27 | 1219 | pr_err("Unable to allocate struct tcm_loop_hba\n"); |
3703b2c5 NB |
1220 | return ERR_PTR(-ENOMEM); |
1221 | } | |
1222 | /* | |
1223 | * Determine the emulated Protocol Identifier and Target Port Name | |
1224 | * based on the incoming configfs directory name. | |
1225 | */ | |
1226 | ptr = strstr(name, "naa."); | |
1227 | if (ptr) { | |
1228 | tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; | |
1229 | goto check_len; | |
1230 | } | |
1231 | ptr = strstr(name, "fc."); | |
1232 | if (ptr) { | |
1233 | tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; | |
1234 | off = 3; /* Skip over "fc." */ | |
1235 | goto check_len; | |
1236 | } | |
1237 | ptr = strstr(name, "iqn."); | |
a57b5d36 | 1238 | if (!ptr) { |
6708bb27 | 1239 | pr_err("Unable to locate prefix for emulated Target " |
a57b5d36 JJ |
1240 | "Port: %s\n", name); |
1241 | ret = -EINVAL; | |
1242 | goto out; | |
3703b2c5 | 1243 | } |
a57b5d36 | 1244 | tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; |
3703b2c5 NB |
1245 | |
1246 | check_len: | |
60d645a4 | 1247 | if (strlen(name) >= TL_WWN_ADDR_LEN) { |
6708bb27 | 1248 | pr_err("Emulated NAA %s Address: %s, exceeds" |
3703b2c5 NB |
1249 | " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), |
1250 | TL_WWN_ADDR_LEN); | |
a57b5d36 JJ |
1251 | ret = -EINVAL; |
1252 | goto out; | |
3703b2c5 NB |
1253 | } |
1254 | snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); | |
1255 | ||
1256 | /* | |
1257 | * Call device_register(tl_hba->dev) to register the emulated | |
1258 | * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after | |
1259 | * device_register() callbacks in tcm_loop_driver_probe() | |
1260 | */ | |
1261 | ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); | |
1262 | if (ret) | |
1263 | goto out; | |
1264 | ||
1265 | sh = tl_hba->sh; | |
1266 | tcm_loop_hba_no_cnt++; | |
6708bb27 | 1267 | pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" |
3703b2c5 NB |
1268 | " %s Address: %s at Linux/SCSI Host ID: %d\n", |
1269 | tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); | |
1270 | ||
1271 | return &tl_hba->tl_hba_wwn; | |
1272 | out: | |
1273 | kfree(tl_hba); | |
1274 | return ERR_PTR(ret); | |
1275 | } | |
1276 | ||
1277 | void tcm_loop_drop_scsi_hba( | |
1278 | struct se_wwn *wwn) | |
1279 | { | |
1280 | struct tcm_loop_hba *tl_hba = container_of(wwn, | |
1281 | struct tcm_loop_hba, tl_hba_wwn); | |
6297b07c NB |
1282 | |
1283 | pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target" | |
1284 | " SAS Address: %s at Linux/SCSI Host ID: %d\n", | |
1285 | tl_hba->tl_wwn_address, tl_hba->sh->host_no); | |
3703b2c5 NB |
1286 | /* |
1287 | * Call device_unregister() on the original tl_hba->dev. | |
1288 | * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will | |
1289 | * release *tl_hba; | |
1290 | */ | |
1291 | device_unregister(&tl_hba->dev); | |
3703b2c5 NB |
1292 | } |
1293 | ||
1294 | /* Start items for tcm_loop_cit */ | |
1295 | static ssize_t tcm_loop_wwn_show_attr_version( | |
1296 | struct target_fabric_configfs *tf, | |
1297 | char *page) | |
1298 | { | |
1299 | return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); | |
1300 | } | |
1301 | ||
1302 | TF_WWN_ATTR_RO(tcm_loop, version); | |
1303 | ||
1304 | static struct configfs_attribute *tcm_loop_wwn_attrs[] = { | |
1305 | &tcm_loop_wwn_version.attr, | |
1306 | NULL, | |
1307 | }; | |
1308 | ||
1309 | /* End items for tcm_loop_cit */ | |
1310 | ||
1311 | static int tcm_loop_register_configfs(void) | |
1312 | { | |
1313 | struct target_fabric_configfs *fabric; | |
3703b2c5 NB |
1314 | int ret; |
1315 | /* | |
1316 | * Set the TCM Loop HBA counter to zero | |
1317 | */ | |
1318 | tcm_loop_hba_no_cnt = 0; | |
1319 | /* | |
1320 | * Register the top level struct config_item_type with TCM core | |
1321 | */ | |
1322 | fabric = target_fabric_configfs_init(THIS_MODULE, "loopback"); | |
e3d6f909 | 1323 | if (IS_ERR(fabric)) { |
6708bb27 | 1324 | pr_err("tcm_loop_register_configfs() failed!\n"); |
e3d6f909 | 1325 | return PTR_ERR(fabric); |
3703b2c5 NB |
1326 | } |
1327 | /* | |
1328 | * Setup the fabric API of function pointers used by target_core_mod | |
1329 | */ | |
1330 | fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name; | |
1331 | fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident; | |
1332 | fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn; | |
1333 | fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag; | |
1334 | fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth; | |
1335 | fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id; | |
1336 | fabric->tf_ops.tpg_get_pr_transport_id_len = | |
1337 | &tcm_loop_get_pr_transport_id_len; | |
1338 | fabric->tf_ops.tpg_parse_pr_out_transport_id = | |
1339 | &tcm_loop_parse_pr_out_transport_id; | |
1340 | fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode; | |
1341 | fabric->tf_ops.tpg_check_demo_mode_cache = | |
1342 | &tcm_loop_check_demo_mode_cache; | |
1343 | fabric->tf_ops.tpg_check_demo_mode_write_protect = | |
1344 | &tcm_loop_check_demo_mode_write_protect; | |
1345 | fabric->tf_ops.tpg_check_prod_mode_write_protect = | |
1346 | &tcm_loop_check_prod_mode_write_protect; | |
1347 | /* | |
1348 | * The TCM loopback fabric module runs in demo-mode to a local | |
1349 | * virtual SCSI device, so fabric dependent initator ACLs are | |
1350 | * not required. | |
1351 | */ | |
1352 | fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl; | |
1353 | fabric->tf_ops.tpg_release_fabric_acl = | |
1354 | &tcm_loop_tpg_release_fabric_acl; | |
1355 | fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index; | |
3703b2c5 NB |
1356 | /* |
1357 | * Used for setting up remaining TCM resources in process context | |
1358 | */ | |
3703b2c5 | 1359 | fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free; |
35462975 | 1360 | fabric->tf_ops.release_cmd = &tcm_loop_release_cmd; |
3703b2c5 NB |
1361 | fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session; |
1362 | fabric->tf_ops.close_session = &tcm_loop_close_session; | |
3703b2c5 NB |
1363 | fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index; |
1364 | fabric->tf_ops.sess_get_initiator_sid = NULL; | |
1365 | fabric->tf_ops.write_pending = &tcm_loop_write_pending; | |
1366 | fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status; | |
1367 | /* | |
1368 | * Not used for TCM loopback | |
1369 | */ | |
1370 | fabric->tf_ops.set_default_node_attributes = | |
1371 | &tcm_loop_set_default_node_attributes; | |
1372 | fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag; | |
1373 | fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state; | |
3703b2c5 NB |
1374 | fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in; |
1375 | fabric->tf_ops.queue_status = &tcm_loop_queue_status; | |
1376 | fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp; | |
1377 | fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len; | |
1378 | fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len; | |
3703b2c5 | 1379 | |
3703b2c5 NB |
1380 | /* |
1381 | * Setup function pointers for generic logic in target_core_fabric_configfs.c | |
1382 | */ | |
1383 | fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba; | |
1384 | fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba; | |
1385 | fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg; | |
1386 | fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg; | |
1387 | /* | |
1388 | * fabric_post_link() and fabric_pre_unlink() are used for | |
1389 | * registration and release of TCM Loop Virtual SCSI LUNs. | |
1390 | */ | |
1391 | fabric->tf_ops.fabric_post_link = &tcm_loop_port_link; | |
1392 | fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink; | |
1393 | fabric->tf_ops.fabric_make_np = NULL; | |
1394 | fabric->tf_ops.fabric_drop_np = NULL; | |
1395 | /* | |
1396 | * Setup default attribute lists for various fabric->tf_cit_tmpl | |
1397 | */ | |
1398 | TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs; | |
1399 | TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs; | |
1400 | TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL; | |
1401 | TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL; | |
1402 | TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL; | |
1403 | /* | |
1404 | * Once fabric->tf_ops has been setup, now register the fabric for | |
1405 | * use within TCM | |
1406 | */ | |
1407 | ret = target_fabric_configfs_register(fabric); | |
1408 | if (ret < 0) { | |
6708bb27 | 1409 | pr_err("target_fabric_configfs_register() for" |
3703b2c5 NB |
1410 | " TCM_Loop failed!\n"); |
1411 | target_fabric_configfs_free(fabric); | |
1412 | return -1; | |
1413 | } | |
1414 | /* | |
1415 | * Setup our local pointer to *fabric. | |
1416 | */ | |
1417 | tcm_loop_fabric_configfs = fabric; | |
6708bb27 | 1418 | pr_debug("TCM_LOOP[0] - Set fabric ->" |
3703b2c5 NB |
1419 | " tcm_loop_fabric_configfs\n"); |
1420 | return 0; | |
1421 | } | |
1422 | ||
1423 | static void tcm_loop_deregister_configfs(void) | |
1424 | { | |
1425 | if (!tcm_loop_fabric_configfs) | |
1426 | return; | |
1427 | ||
1428 | target_fabric_configfs_deregister(tcm_loop_fabric_configfs); | |
1429 | tcm_loop_fabric_configfs = NULL; | |
6708bb27 | 1430 | pr_debug("TCM_LOOP[0] - Cleared" |
3703b2c5 NB |
1431 | " tcm_loop_fabric_configfs\n"); |
1432 | } | |
1433 | ||
1434 | static int __init tcm_loop_fabric_init(void) | |
1435 | { | |
afe2cb7f CH |
1436 | int ret = -ENOMEM; |
1437 | ||
1438 | tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0); | |
1439 | if (!tcm_loop_workqueue) | |
1440 | goto out; | |
3703b2c5 NB |
1441 | |
1442 | tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", | |
1443 | sizeof(struct tcm_loop_cmd), | |
1444 | __alignof__(struct tcm_loop_cmd), | |
1445 | 0, NULL); | |
1446 | if (!tcm_loop_cmd_cache) { | |
6708bb27 | 1447 | pr_debug("kmem_cache_create() for" |
3703b2c5 | 1448 | " tcm_loop_cmd_cache failed\n"); |
afe2cb7f | 1449 | goto out_destroy_workqueue; |
3703b2c5 NB |
1450 | } |
1451 | ||
1452 | ret = tcm_loop_alloc_core_bus(); | |
1453 | if (ret) | |
afe2cb7f | 1454 | goto out_destroy_cache; |
3703b2c5 NB |
1455 | |
1456 | ret = tcm_loop_register_configfs(); | |
afe2cb7f CH |
1457 | if (ret) |
1458 | goto out_release_core_bus; | |
3703b2c5 NB |
1459 | |
1460 | return 0; | |
afe2cb7f CH |
1461 | |
1462 | out_release_core_bus: | |
1463 | tcm_loop_release_core_bus(); | |
1464 | out_destroy_cache: | |
1465 | kmem_cache_destroy(tcm_loop_cmd_cache); | |
1466 | out_destroy_workqueue: | |
1467 | destroy_workqueue(tcm_loop_workqueue); | |
1468 | out: | |
1469 | return ret; | |
3703b2c5 NB |
1470 | } |
1471 | ||
1472 | static void __exit tcm_loop_fabric_exit(void) | |
1473 | { | |
1474 | tcm_loop_deregister_configfs(); | |
1475 | tcm_loop_release_core_bus(); | |
1476 | kmem_cache_destroy(tcm_loop_cmd_cache); | |
afe2cb7f | 1477 | destroy_workqueue(tcm_loop_workqueue); |
3703b2c5 NB |
1478 | } |
1479 | ||
1480 | MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); | |
1481 | MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>"); | |
1482 | MODULE_LICENSE("GPL"); | |
1483 | module_init(tcm_loop_fabric_init); | |
1484 | module_exit(tcm_loop_fabric_exit); |