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3703b2c5 NB |
1 | /******************************************************************************* |
2 | * | |
3 | * This file contains the Linux/SCSI LLD virtual SCSI initiator driver | |
4 | * for emulated SAS initiator ports | |
5 | * | |
6 | * © Copyright 2011 RisingTide Systems LLC. | |
7 | * | |
8 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
9 | * | |
10 | * Author: Nicholas A. Bellinger <nab@risingtidesystems.com> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | ****************************************************************************/ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/moduleparam.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/configfs.h> | |
29 | #include <scsi/scsi.h> | |
30 | #include <scsi/scsi_tcq.h> | |
31 | #include <scsi/scsi_host.h> | |
32 | #include <scsi/scsi_device.h> | |
33 | #include <scsi/scsi_cmnd.h> | |
61db1802 | 34 | #include <scsi/scsi_tcq.h> |
3703b2c5 NB |
35 | |
36 | #include <target/target_core_base.h> | |
37 | #include <target/target_core_transport.h> | |
38 | #include <target/target_core_fabric_ops.h> | |
39 | #include <target/target_core_fabric_configfs.h> | |
40 | #include <target/target_core_fabric_lib.h> | |
41 | #include <target/target_core_configfs.h> | |
42 | #include <target/target_core_device.h> | |
43 | #include <target/target_core_tpg.h> | |
44 | #include <target/target_core_tmr.h> | |
45 | ||
46 | #include "tcm_loop.h" | |
47 | ||
48 | #define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev) | |
49 | ||
50 | /* Local pointer to allocated TCM configfs fabric module */ | |
51 | static struct target_fabric_configfs *tcm_loop_fabric_configfs; | |
52 | ||
53 | static struct kmem_cache *tcm_loop_cmd_cache; | |
54 | ||
55 | static int tcm_loop_hba_no_cnt; | |
56 | ||
57 | /* | |
58 | * Allocate a tcm_loop cmd descriptor from target_core_mod code | |
59 | * | |
60 | * Can be called from interrupt context in tcm_loop_queuecommand() below | |
61 | */ | |
62 | static struct se_cmd *tcm_loop_allocate_core_cmd( | |
63 | struct tcm_loop_hba *tl_hba, | |
64 | struct se_portal_group *se_tpg, | |
65 | struct scsi_cmnd *sc) | |
66 | { | |
67 | struct se_cmd *se_cmd; | |
68 | struct se_session *se_sess; | |
69 | struct tcm_loop_nexus *tl_nexus = tl_hba->tl_nexus; | |
70 | struct tcm_loop_cmd *tl_cmd; | |
71 | int sam_task_attr; | |
72 | ||
73 | if (!tl_nexus) { | |
74 | scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus" | |
75 | " does not exist\n"); | |
76 | set_host_byte(sc, DID_ERROR); | |
77 | return NULL; | |
78 | } | |
79 | se_sess = tl_nexus->se_sess; | |
80 | ||
81 | tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC); | |
82 | if (!tl_cmd) { | |
83 | printk(KERN_ERR "Unable to allocate struct tcm_loop_cmd\n"); | |
84 | set_host_byte(sc, DID_ERROR); | |
85 | return NULL; | |
86 | } | |
87 | se_cmd = &tl_cmd->tl_se_cmd; | |
88 | /* | |
89 | * Save the pointer to struct scsi_cmnd *sc | |
90 | */ | |
91 | tl_cmd->sc = sc; | |
92 | /* | |
93 | * Locate the SAM Task Attr from struct scsi_cmnd * | |
94 | */ | |
95 | if (sc->device->tagged_supported) { | |
96 | switch (sc->tag) { | |
97 | case HEAD_OF_QUEUE_TAG: | |
61db1802 | 98 | sam_task_attr = MSG_HEAD_TAG; |
3703b2c5 NB |
99 | break; |
100 | case ORDERED_QUEUE_TAG: | |
61db1802 | 101 | sam_task_attr = MSG_ORDERED_TAG; |
3703b2c5 NB |
102 | break; |
103 | default: | |
61db1802 | 104 | sam_task_attr = MSG_SIMPLE_TAG; |
3703b2c5 NB |
105 | break; |
106 | } | |
107 | } else | |
61db1802 | 108 | sam_task_attr = MSG_SIMPLE_TAG; |
3703b2c5 NB |
109 | |
110 | /* | |
111 | * Initialize struct se_cmd descriptor from target_core_mod infrastructure | |
112 | */ | |
113 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
114 | scsi_bufflen(sc), sc->sc_data_direction, sam_task_attr, | |
115 | &tl_cmd->tl_sense_buf[0]); | |
116 | ||
117 | /* | |
118 | * Signal BIDI usage with T_TASK(cmd)->t_tasks_bidi | |
119 | */ | |
120 | if (scsi_bidi_cmnd(sc)) | |
a1d8b49a | 121 | se_cmd->t_tasks_bidi = 1; |
3703b2c5 NB |
122 | /* |
123 | * Locate the struct se_lun pointer and attach it to struct se_cmd | |
124 | */ | |
5951146d | 125 | if (transport_lookup_cmd_lun(se_cmd, tl_cmd->sc->device->lun) < 0) { |
3703b2c5 NB |
126 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); |
127 | set_host_byte(sc, DID_NO_CONNECT); | |
128 | return NULL; | |
129 | } | |
130 | ||
3703b2c5 NB |
131 | return se_cmd; |
132 | } | |
133 | ||
134 | /* | |
135 | * Called by struct target_core_fabric_ops->new_cmd_map() | |
136 | * | |
137 | * Always called in process context. A non zero return value | |
138 | * here will signal to handle an exception based on the return code. | |
139 | */ | |
140 | static int tcm_loop_new_cmd_map(struct se_cmd *se_cmd) | |
141 | { | |
142 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
143 | struct tcm_loop_cmd, tl_se_cmd); | |
144 | struct scsi_cmnd *sc = tl_cmd->sc; | |
5951146d AG |
145 | struct scatterlist *sgl_bidi = NULL; |
146 | u32 sgl_bidi_count = 0; | |
3703b2c5 NB |
147 | int ret; |
148 | /* | |
149 | * Allocate the necessary tasks to complete the received CDB+data | |
150 | */ | |
5951146d AG |
151 | ret = transport_generic_allocate_tasks(se_cmd, sc->cmnd); |
152 | if (ret == -ENOMEM) { | |
3703b2c5 NB |
153 | /* Out of Resources */ |
154 | return PYX_TRANSPORT_LU_COMM_FAILURE; | |
5951146d | 155 | } else if (ret == -EINVAL) { |
3703b2c5 NB |
156 | /* |
157 | * Handle case for SAM_STAT_RESERVATION_CONFLICT | |
158 | */ | |
159 | if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT) | |
160 | return PYX_TRANSPORT_RESERVATION_CONFLICT; | |
161 | /* | |
162 | * Otherwise, return SAM_STAT_CHECK_CONDITION and return | |
163 | * sense data. | |
164 | */ | |
165 | return PYX_TRANSPORT_USE_SENSE_REASON; | |
166 | } | |
5951146d | 167 | |
3703b2c5 | 168 | /* |
5951146d AG |
169 | * For BIDI commands, pass in the extra READ buffer |
170 | * to transport_generic_map_mem_to_cmd() below.. | |
3703b2c5 | 171 | */ |
a1d8b49a | 172 | if (se_cmd->t_tasks_bidi) { |
5951146d | 173 | struct scsi_data_buffer *sdb = scsi_in(sc); |
3703b2c5 | 174 | |
5951146d AG |
175 | sgl_bidi = sdb->table.sgl; |
176 | sgl_bidi_count = sdb->table.nents; | |
3703b2c5 | 177 | } |
5951146d | 178 | |
3703b2c5 NB |
179 | /* |
180 | * Map the SG memory into struct se_mem->page linked list using the same | |
181 | * physical memory at sg->page_link. | |
182 | */ | |
5951146d AG |
183 | ret = transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc), |
184 | scsi_sg_count(sc), sgl_bidi, sgl_bidi_count); | |
3703b2c5 NB |
185 | if (ret < 0) |
186 | return PYX_TRANSPORT_LU_COMM_FAILURE; | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | /* | |
192 | * Called from struct target_core_fabric_ops->check_stop_free() | |
193 | */ | |
194 | static void tcm_loop_check_stop_free(struct se_cmd *se_cmd) | |
195 | { | |
196 | /* | |
197 | * Do not release struct se_cmd's containing a valid TMR | |
198 | * pointer. These will be released directly in tcm_loop_device_reset() | |
199 | * with transport_generic_free_cmd(). | |
200 | */ | |
201 | if (se_cmd->se_tmr_req) | |
202 | return; | |
203 | /* | |
204 | * Release the struct se_cmd, which will make a callback to release | |
205 | * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd() | |
206 | */ | |
207 | transport_generic_free_cmd(se_cmd, 0, 1, 0); | |
208 | } | |
209 | ||
210 | /* | |
211 | * Called from struct target_core_fabric_ops->release_cmd_to_pool() | |
212 | */ | |
213 | static void tcm_loop_deallocate_core_cmd(struct se_cmd *se_cmd) | |
214 | { | |
215 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
216 | struct tcm_loop_cmd, tl_se_cmd); | |
217 | ||
218 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); | |
219 | } | |
220 | ||
221 | static int tcm_loop_proc_info(struct Scsi_Host *host, char *buffer, | |
222 | char **start, off_t offset, | |
223 | int length, int inout) | |
224 | { | |
225 | return sprintf(buffer, "tcm_loop_proc_info()\n"); | |
226 | } | |
227 | ||
228 | static int tcm_loop_driver_probe(struct device *); | |
229 | static int tcm_loop_driver_remove(struct device *); | |
230 | ||
231 | static int pseudo_lld_bus_match(struct device *dev, | |
232 | struct device_driver *dev_driver) | |
233 | { | |
234 | return 1; | |
235 | } | |
236 | ||
237 | static struct bus_type tcm_loop_lld_bus = { | |
238 | .name = "tcm_loop_bus", | |
239 | .match = pseudo_lld_bus_match, | |
240 | .probe = tcm_loop_driver_probe, | |
241 | .remove = tcm_loop_driver_remove, | |
242 | }; | |
243 | ||
244 | static struct device_driver tcm_loop_driverfs = { | |
245 | .name = "tcm_loop", | |
246 | .bus = &tcm_loop_lld_bus, | |
247 | }; | |
248 | /* | |
249 | * Used with root_device_register() in tcm_loop_alloc_core_bus() below | |
250 | */ | |
251 | struct device *tcm_loop_primary; | |
252 | ||
253 | /* | |
254 | * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and | |
255 | * drivers/scsi/libiscsi.c:iscsi_change_queue_depth() | |
256 | */ | |
257 | static int tcm_loop_change_queue_depth( | |
258 | struct scsi_device *sdev, | |
259 | int depth, | |
260 | int reason) | |
261 | { | |
262 | switch (reason) { | |
263 | case SCSI_QDEPTH_DEFAULT: | |
264 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
265 | break; | |
266 | case SCSI_QDEPTH_QFULL: | |
267 | scsi_track_queue_full(sdev, depth); | |
268 | break; | |
269 | case SCSI_QDEPTH_RAMP_UP: | |
270 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
271 | break; | |
272 | default: | |
273 | return -EOPNOTSUPP; | |
274 | } | |
275 | return sdev->queue_depth; | |
276 | } | |
277 | ||
278 | /* | |
279 | * Main entry point from struct scsi_host_template for incoming SCSI CDB+Data | |
280 | * from Linux/SCSI subsystem for SCSI low level device drivers (LLDs) | |
281 | */ | |
282 | static int tcm_loop_queuecommand( | |
283 | struct Scsi_Host *sh, | |
284 | struct scsi_cmnd *sc) | |
285 | { | |
286 | struct se_cmd *se_cmd; | |
287 | struct se_portal_group *se_tpg; | |
288 | struct tcm_loop_hba *tl_hba; | |
289 | struct tcm_loop_tpg *tl_tpg; | |
290 | ||
291 | TL_CDB_DEBUG("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x" | |
292 | " scsi_buf_len: %u\n", sc->device->host->host_no, | |
293 | sc->device->id, sc->device->channel, sc->device->lun, | |
294 | sc->cmnd[0], scsi_bufflen(sc)); | |
295 | /* | |
296 | * Locate the tcm_loop_hba_t pointer | |
297 | */ | |
298 | tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); | |
299 | tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; | |
300 | se_tpg = &tl_tpg->tl_se_tpg; | |
301 | /* | |
302 | * Determine the SAM Task Attribute and allocate tl_cmd and | |
303 | * tl_cmd->tl_se_cmd from TCM infrastructure | |
304 | */ | |
305 | se_cmd = tcm_loop_allocate_core_cmd(tl_hba, se_tpg, sc); | |
306 | if (!se_cmd) { | |
307 | sc->scsi_done(sc); | |
308 | return 0; | |
309 | } | |
310 | /* | |
311 | * Queue up the newly allocated to be processed in TCM thread context. | |
312 | */ | |
313 | transport_generic_handle_cdb_map(se_cmd); | |
314 | return 0; | |
315 | } | |
316 | ||
317 | /* | |
318 | * Called from SCSI EH process context to issue a LUN_RESET TMR | |
319 | * to struct scsi_device | |
320 | */ | |
321 | static int tcm_loop_device_reset(struct scsi_cmnd *sc) | |
322 | { | |
323 | struct se_cmd *se_cmd = NULL; | |
324 | struct se_portal_group *se_tpg; | |
325 | struct se_session *se_sess; | |
326 | struct tcm_loop_cmd *tl_cmd = NULL; | |
327 | struct tcm_loop_hba *tl_hba; | |
328 | struct tcm_loop_nexus *tl_nexus; | |
329 | struct tcm_loop_tmr *tl_tmr = NULL; | |
330 | struct tcm_loop_tpg *tl_tpg; | |
331 | int ret = FAILED; | |
332 | /* | |
333 | * Locate the tcm_loop_hba_t pointer | |
334 | */ | |
335 | tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); | |
336 | /* | |
337 | * Locate the tl_nexus and se_sess pointers | |
338 | */ | |
339 | tl_nexus = tl_hba->tl_nexus; | |
340 | if (!tl_nexus) { | |
341 | printk(KERN_ERR "Unable to perform device reset without" | |
342 | " active I_T Nexus\n"); | |
343 | return FAILED; | |
344 | } | |
345 | se_sess = tl_nexus->se_sess; | |
346 | /* | |
347 | * Locate the tl_tpg and se_tpg pointers from TargetID in sc->device->id | |
348 | */ | |
349 | tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; | |
350 | se_tpg = &tl_tpg->tl_se_tpg; | |
351 | ||
352 | tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); | |
353 | if (!tl_cmd) { | |
354 | printk(KERN_ERR "Unable to allocate memory for tl_cmd\n"); | |
355 | return FAILED; | |
356 | } | |
357 | ||
358 | tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL); | |
359 | if (!tl_tmr) { | |
360 | printk(KERN_ERR "Unable to allocate memory for tl_tmr\n"); | |
361 | goto release; | |
362 | } | |
363 | init_waitqueue_head(&tl_tmr->tl_tmr_wait); | |
364 | ||
365 | se_cmd = &tl_cmd->tl_se_cmd; | |
366 | /* | |
367 | * Initialize struct se_cmd descriptor from target_core_mod infrastructure | |
368 | */ | |
369 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0, | |
61db1802 | 370 | DMA_NONE, MSG_SIMPLE_TAG, |
3703b2c5 NB |
371 | &tl_cmd->tl_sense_buf[0]); |
372 | /* | |
373 | * Allocate the LUN_RESET TMR | |
374 | */ | |
5951146d | 375 | se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd, tl_tmr, |
3703b2c5 | 376 | TMR_LUN_RESET); |
552523dc | 377 | if (IS_ERR(se_cmd->se_tmr_req)) |
3703b2c5 NB |
378 | goto release; |
379 | /* | |
380 | * Locate the underlying TCM struct se_lun from sc->device->lun | |
381 | */ | |
5951146d | 382 | if (transport_lookup_tmr_lun(se_cmd, sc->device->lun) < 0) |
3703b2c5 NB |
383 | goto release; |
384 | /* | |
385 | * Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp() | |
386 | * to wake us up. | |
387 | */ | |
388 | transport_generic_handle_tmr(se_cmd); | |
389 | wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete)); | |
390 | /* | |
391 | * The TMR LUN_RESET has completed, check the response status and | |
392 | * then release allocations. | |
393 | */ | |
394 | ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? | |
395 | SUCCESS : FAILED; | |
396 | release: | |
397 | if (se_cmd) | |
398 | transport_generic_free_cmd(se_cmd, 1, 1, 0); | |
399 | else | |
400 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); | |
401 | kfree(tl_tmr); | |
402 | return ret; | |
403 | } | |
404 | ||
405 | static int tcm_loop_slave_alloc(struct scsi_device *sd) | |
406 | { | |
407 | set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags); | |
408 | return 0; | |
409 | } | |
410 | ||
411 | static int tcm_loop_slave_configure(struct scsi_device *sd) | |
412 | { | |
413 | return 0; | |
414 | } | |
415 | ||
416 | static struct scsi_host_template tcm_loop_driver_template = { | |
417 | .proc_info = tcm_loop_proc_info, | |
418 | .proc_name = "tcm_loopback", | |
419 | .name = "TCM_Loopback", | |
420 | .queuecommand = tcm_loop_queuecommand, | |
421 | .change_queue_depth = tcm_loop_change_queue_depth, | |
422 | .eh_device_reset_handler = tcm_loop_device_reset, | |
423 | .can_queue = TL_SCSI_CAN_QUEUE, | |
424 | .this_id = -1, | |
425 | .sg_tablesize = TL_SCSI_SG_TABLESIZE, | |
426 | .cmd_per_lun = TL_SCSI_CMD_PER_LUN, | |
427 | .max_sectors = TL_SCSI_MAX_SECTORS, | |
428 | .use_clustering = DISABLE_CLUSTERING, | |
429 | .slave_alloc = tcm_loop_slave_alloc, | |
430 | .slave_configure = tcm_loop_slave_configure, | |
431 | .module = THIS_MODULE, | |
432 | }; | |
433 | ||
434 | static int tcm_loop_driver_probe(struct device *dev) | |
435 | { | |
436 | struct tcm_loop_hba *tl_hba; | |
437 | struct Scsi_Host *sh; | |
438 | int error; | |
439 | ||
440 | tl_hba = to_tcm_loop_hba(dev); | |
441 | ||
442 | sh = scsi_host_alloc(&tcm_loop_driver_template, | |
443 | sizeof(struct tcm_loop_hba)); | |
444 | if (!sh) { | |
445 | printk(KERN_ERR "Unable to allocate struct scsi_host\n"); | |
446 | return -ENODEV; | |
447 | } | |
448 | tl_hba->sh = sh; | |
449 | ||
450 | /* | |
451 | * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata | |
452 | */ | |
453 | *((struct tcm_loop_hba **)sh->hostdata) = tl_hba; | |
454 | /* | |
455 | * Setup single ID, Channel and LUN for now.. | |
456 | */ | |
457 | sh->max_id = 2; | |
458 | sh->max_lun = 0; | |
459 | sh->max_channel = 0; | |
460 | sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN; | |
461 | ||
462 | error = scsi_add_host(sh, &tl_hba->dev); | |
463 | if (error) { | |
464 | printk(KERN_ERR "%s: scsi_add_host failed\n", __func__); | |
465 | scsi_host_put(sh); | |
466 | return -ENODEV; | |
467 | } | |
468 | return 0; | |
469 | } | |
470 | ||
471 | static int tcm_loop_driver_remove(struct device *dev) | |
472 | { | |
473 | struct tcm_loop_hba *tl_hba; | |
474 | struct Scsi_Host *sh; | |
475 | ||
476 | tl_hba = to_tcm_loop_hba(dev); | |
477 | sh = tl_hba->sh; | |
478 | ||
479 | scsi_remove_host(sh); | |
480 | scsi_host_put(sh); | |
481 | return 0; | |
482 | } | |
483 | ||
484 | static void tcm_loop_release_adapter(struct device *dev) | |
485 | { | |
486 | struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev); | |
487 | ||
488 | kfree(tl_hba); | |
489 | } | |
490 | ||
491 | /* | |
492 | * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c | |
493 | */ | |
494 | static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id) | |
495 | { | |
496 | int ret; | |
497 | ||
498 | tl_hba->dev.bus = &tcm_loop_lld_bus; | |
499 | tl_hba->dev.parent = tcm_loop_primary; | |
500 | tl_hba->dev.release = &tcm_loop_release_adapter; | |
501 | dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id); | |
502 | ||
503 | ret = device_register(&tl_hba->dev); | |
504 | if (ret) { | |
505 | printk(KERN_ERR "device_register() failed for" | |
506 | " tl_hba->dev: %d\n", ret); | |
507 | return -ENODEV; | |
508 | } | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | /* | |
514 | * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated | |
515 | * tcm_loop SCSI bus. | |
516 | */ | |
517 | static int tcm_loop_alloc_core_bus(void) | |
518 | { | |
519 | int ret; | |
520 | ||
521 | tcm_loop_primary = root_device_register("tcm_loop_0"); | |
522 | if (IS_ERR(tcm_loop_primary)) { | |
523 | printk(KERN_ERR "Unable to allocate tcm_loop_primary\n"); | |
524 | return PTR_ERR(tcm_loop_primary); | |
525 | } | |
526 | ||
527 | ret = bus_register(&tcm_loop_lld_bus); | |
528 | if (ret) { | |
529 | printk(KERN_ERR "bus_register() failed for tcm_loop_lld_bus\n"); | |
530 | goto dev_unreg; | |
531 | } | |
532 | ||
533 | ret = driver_register(&tcm_loop_driverfs); | |
534 | if (ret) { | |
535 | printk(KERN_ERR "driver_register() failed for" | |
536 | "tcm_loop_driverfs\n"); | |
537 | goto bus_unreg; | |
538 | } | |
539 | ||
540 | printk(KERN_INFO "Initialized TCM Loop Core Bus\n"); | |
541 | return ret; | |
542 | ||
543 | bus_unreg: | |
544 | bus_unregister(&tcm_loop_lld_bus); | |
545 | dev_unreg: | |
546 | root_device_unregister(tcm_loop_primary); | |
547 | return ret; | |
548 | } | |
549 | ||
550 | static void tcm_loop_release_core_bus(void) | |
551 | { | |
552 | driver_unregister(&tcm_loop_driverfs); | |
553 | bus_unregister(&tcm_loop_lld_bus); | |
554 | root_device_unregister(tcm_loop_primary); | |
555 | ||
556 | printk(KERN_INFO "Releasing TCM Loop Core BUS\n"); | |
557 | } | |
558 | ||
559 | static char *tcm_loop_get_fabric_name(void) | |
560 | { | |
561 | return "loopback"; | |
562 | } | |
563 | ||
564 | static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg) | |
565 | { | |
566 | struct tcm_loop_tpg *tl_tpg = | |
567 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
568 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
569 | /* | |
570 | * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba() | |
571 | * time based on the protocol dependent prefix of the passed configfs group. | |
572 | * | |
573 | * Based upon tl_proto_id, TCM_Loop emulates the requested fabric | |
574 | * ProtocolID using target_core_fabric_lib.c symbols. | |
575 | */ | |
576 | switch (tl_hba->tl_proto_id) { | |
577 | case SCSI_PROTOCOL_SAS: | |
578 | return sas_get_fabric_proto_ident(se_tpg); | |
579 | case SCSI_PROTOCOL_FCP: | |
580 | return fc_get_fabric_proto_ident(se_tpg); | |
581 | case SCSI_PROTOCOL_ISCSI: | |
582 | return iscsi_get_fabric_proto_ident(se_tpg); | |
583 | default: | |
584 | printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using" | |
585 | " SAS emulation\n", tl_hba->tl_proto_id); | |
586 | break; | |
587 | } | |
588 | ||
589 | return sas_get_fabric_proto_ident(se_tpg); | |
590 | } | |
591 | ||
592 | static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg) | |
593 | { | |
594 | struct tcm_loop_tpg *tl_tpg = | |
595 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
596 | /* | |
597 | * Return the passed NAA identifier for the SAS Target Port | |
598 | */ | |
599 | return &tl_tpg->tl_hba->tl_wwn_address[0]; | |
600 | } | |
601 | ||
602 | static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg) | |
603 | { | |
604 | struct tcm_loop_tpg *tl_tpg = | |
605 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
606 | /* | |
607 | * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 | |
608 | * to represent the SCSI Target Port. | |
609 | */ | |
610 | return tl_tpg->tl_tpgt; | |
611 | } | |
612 | ||
613 | static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg) | |
614 | { | |
615 | return 1; | |
616 | } | |
617 | ||
618 | static u32 tcm_loop_get_pr_transport_id( | |
619 | struct se_portal_group *se_tpg, | |
620 | struct se_node_acl *se_nacl, | |
621 | struct t10_pr_registration *pr_reg, | |
622 | int *format_code, | |
623 | unsigned char *buf) | |
624 | { | |
625 | struct tcm_loop_tpg *tl_tpg = | |
626 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
627 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
628 | ||
629 | switch (tl_hba->tl_proto_id) { | |
630 | case SCSI_PROTOCOL_SAS: | |
631 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
632 | format_code, buf); | |
633 | case SCSI_PROTOCOL_FCP: | |
634 | return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
635 | format_code, buf); | |
636 | case SCSI_PROTOCOL_ISCSI: | |
637 | return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
638 | format_code, buf); | |
639 | default: | |
640 | printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using" | |
641 | " SAS emulation\n", tl_hba->tl_proto_id); | |
642 | break; | |
643 | } | |
644 | ||
645 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
646 | format_code, buf); | |
647 | } | |
648 | ||
649 | static u32 tcm_loop_get_pr_transport_id_len( | |
650 | struct se_portal_group *se_tpg, | |
651 | struct se_node_acl *se_nacl, | |
652 | struct t10_pr_registration *pr_reg, | |
653 | int *format_code) | |
654 | { | |
655 | struct tcm_loop_tpg *tl_tpg = | |
656 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
657 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
658 | ||
659 | switch (tl_hba->tl_proto_id) { | |
660 | case SCSI_PROTOCOL_SAS: | |
661 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
662 | format_code); | |
663 | case SCSI_PROTOCOL_FCP: | |
664 | return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
665 | format_code); | |
666 | case SCSI_PROTOCOL_ISCSI: | |
667 | return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
668 | format_code); | |
669 | default: | |
670 | printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using" | |
671 | " SAS emulation\n", tl_hba->tl_proto_id); | |
672 | break; | |
673 | } | |
674 | ||
675 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
676 | format_code); | |
677 | } | |
678 | ||
679 | /* | |
680 | * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above | |
681 | * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. | |
682 | */ | |
683 | static char *tcm_loop_parse_pr_out_transport_id( | |
684 | struct se_portal_group *se_tpg, | |
685 | const char *buf, | |
686 | u32 *out_tid_len, | |
687 | char **port_nexus_ptr) | |
688 | { | |
689 | struct tcm_loop_tpg *tl_tpg = | |
690 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
691 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
692 | ||
693 | switch (tl_hba->tl_proto_id) { | |
694 | case SCSI_PROTOCOL_SAS: | |
695 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
696 | port_nexus_ptr); | |
697 | case SCSI_PROTOCOL_FCP: | |
698 | return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
699 | port_nexus_ptr); | |
700 | case SCSI_PROTOCOL_ISCSI: | |
701 | return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
702 | port_nexus_ptr); | |
703 | default: | |
704 | printk(KERN_ERR "Unknown tl_proto_id: 0x%02x, using" | |
705 | " SAS emulation\n", tl_hba->tl_proto_id); | |
706 | break; | |
707 | } | |
708 | ||
709 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
710 | port_nexus_ptr); | |
711 | } | |
712 | ||
713 | /* | |
714 | * Returning (1) here allows for target_core_mod struct se_node_acl to be generated | |
715 | * based upon the incoming fabric dependent SCSI Initiator Port | |
716 | */ | |
717 | static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) | |
718 | { | |
719 | return 1; | |
720 | } | |
721 | ||
722 | static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) | |
723 | { | |
724 | return 0; | |
725 | } | |
726 | ||
727 | /* | |
728 | * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for | |
729 | * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest | |
730 | */ | |
731 | static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) | |
732 | { | |
733 | return 0; | |
734 | } | |
735 | ||
736 | /* | |
737 | * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will | |
738 | * never be called for TCM_Loop by target_core_fabric_configfs.c code. | |
739 | * It has been added here as a nop for target_fabric_tf_ops_check() | |
740 | */ | |
741 | static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) | |
742 | { | |
743 | return 0; | |
744 | } | |
745 | ||
746 | static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl( | |
747 | struct se_portal_group *se_tpg) | |
748 | { | |
749 | struct tcm_loop_nacl *tl_nacl; | |
750 | ||
751 | tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL); | |
752 | if (!tl_nacl) { | |
753 | printk(KERN_ERR "Unable to allocate struct tcm_loop_nacl\n"); | |
754 | return NULL; | |
755 | } | |
756 | ||
757 | return &tl_nacl->se_node_acl; | |
758 | } | |
759 | ||
760 | static void tcm_loop_tpg_release_fabric_acl( | |
761 | struct se_portal_group *se_tpg, | |
762 | struct se_node_acl *se_nacl) | |
763 | { | |
764 | struct tcm_loop_nacl *tl_nacl = container_of(se_nacl, | |
765 | struct tcm_loop_nacl, se_node_acl); | |
766 | ||
767 | kfree(tl_nacl); | |
768 | } | |
769 | ||
770 | static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) | |
771 | { | |
772 | return 1; | |
773 | } | |
774 | ||
3703b2c5 NB |
775 | static int tcm_loop_is_state_remove(struct se_cmd *se_cmd) |
776 | { | |
777 | /* | |
778 | * Assume struct scsi_cmnd is not in remove state.. | |
779 | */ | |
780 | return 0; | |
781 | } | |
782 | ||
783 | static int tcm_loop_sess_logged_in(struct se_session *se_sess) | |
784 | { | |
785 | /* | |
786 | * Assume that TL Nexus is always active | |
787 | */ | |
788 | return 1; | |
789 | } | |
790 | ||
791 | static u32 tcm_loop_sess_get_index(struct se_session *se_sess) | |
792 | { | |
793 | return 1; | |
794 | } | |
795 | ||
796 | static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) | |
797 | { | |
798 | return; | |
799 | } | |
800 | ||
801 | static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd) | |
802 | { | |
803 | return 1; | |
804 | } | |
805 | ||
806 | static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) | |
807 | { | |
808 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
809 | struct tcm_loop_cmd, tl_se_cmd); | |
810 | ||
811 | return tl_cmd->sc_cmd_state; | |
812 | } | |
813 | ||
814 | static int tcm_loop_shutdown_session(struct se_session *se_sess) | |
815 | { | |
816 | return 0; | |
817 | } | |
818 | ||
819 | static void tcm_loop_close_session(struct se_session *se_sess) | |
820 | { | |
821 | return; | |
822 | }; | |
823 | ||
824 | static void tcm_loop_stop_session( | |
825 | struct se_session *se_sess, | |
826 | int sess_sleep, | |
827 | int conn_sleep) | |
828 | { | |
829 | return; | |
830 | } | |
831 | ||
832 | static void tcm_loop_fall_back_to_erl0(struct se_session *se_sess) | |
833 | { | |
834 | return; | |
835 | } | |
836 | ||
837 | static int tcm_loop_write_pending(struct se_cmd *se_cmd) | |
838 | { | |
839 | /* | |
840 | * Since Linux/SCSI has already sent down a struct scsi_cmnd | |
841 | * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array | |
842 | * memory, and memory has already been mapped to struct se_cmd->t_mem_list | |
843 | * format with transport_generic_map_mem_to_cmd(). | |
844 | * | |
845 | * We now tell TCM to add this WRITE CDB directly into the TCM storage | |
846 | * object execution queue. | |
847 | */ | |
848 | transport_generic_process_write(se_cmd); | |
849 | return 0; | |
850 | } | |
851 | ||
852 | static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) | |
853 | { | |
854 | return 0; | |
855 | } | |
856 | ||
857 | static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) | |
858 | { | |
859 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
860 | struct tcm_loop_cmd, tl_se_cmd); | |
861 | struct scsi_cmnd *sc = tl_cmd->sc; | |
862 | ||
863 | TL_CDB_DEBUG("tcm_loop_queue_data_in() called for scsi_cmnd: %p" | |
864 | " cdb: 0x%02x\n", sc, sc->cmnd[0]); | |
865 | ||
866 | sc->result = SAM_STAT_GOOD; | |
867 | set_host_byte(sc, DID_OK); | |
868 | sc->scsi_done(sc); | |
869 | return 0; | |
870 | } | |
871 | ||
872 | static int tcm_loop_queue_status(struct se_cmd *se_cmd) | |
873 | { | |
874 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
875 | struct tcm_loop_cmd, tl_se_cmd); | |
876 | struct scsi_cmnd *sc = tl_cmd->sc; | |
877 | ||
878 | TL_CDB_DEBUG("tcm_loop_queue_status() called for scsi_cmnd: %p" | |
879 | " cdb: 0x%02x\n", sc, sc->cmnd[0]); | |
880 | ||
881 | if (se_cmd->sense_buffer && | |
882 | ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || | |
883 | (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { | |
884 | ||
5951146d | 885 | memcpy(sc->sense_buffer, se_cmd->sense_buffer, |
3703b2c5 NB |
886 | SCSI_SENSE_BUFFERSIZE); |
887 | sc->result = SAM_STAT_CHECK_CONDITION; | |
888 | set_driver_byte(sc, DRIVER_SENSE); | |
889 | } else | |
890 | sc->result = se_cmd->scsi_status; | |
891 | ||
892 | set_host_byte(sc, DID_OK); | |
893 | sc->scsi_done(sc); | |
894 | return 0; | |
895 | } | |
896 | ||
897 | static int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) | |
898 | { | |
899 | struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; | |
900 | struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; | |
901 | /* | |
902 | * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead | |
903 | * and wake up the wait_queue_head_t in tcm_loop_device_reset() | |
904 | */ | |
905 | atomic_set(&tl_tmr->tmr_complete, 1); | |
906 | wake_up(&tl_tmr->tl_tmr_wait); | |
907 | return 0; | |
908 | } | |
909 | ||
910 | static u16 tcm_loop_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length) | |
911 | { | |
912 | return 0; | |
913 | } | |
914 | ||
915 | static u16 tcm_loop_get_fabric_sense_len(void) | |
916 | { | |
917 | return 0; | |
918 | } | |
919 | ||
3703b2c5 NB |
920 | static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) |
921 | { | |
922 | switch (tl_hba->tl_proto_id) { | |
923 | case SCSI_PROTOCOL_SAS: | |
924 | return "SAS"; | |
925 | case SCSI_PROTOCOL_FCP: | |
926 | return "FCP"; | |
927 | case SCSI_PROTOCOL_ISCSI: | |
928 | return "iSCSI"; | |
929 | default: | |
930 | break; | |
931 | } | |
932 | ||
933 | return "Unknown"; | |
934 | } | |
935 | ||
936 | /* Start items for tcm_loop_port_cit */ | |
937 | ||
938 | static int tcm_loop_port_link( | |
939 | struct se_portal_group *se_tpg, | |
940 | struct se_lun *lun) | |
941 | { | |
942 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
943 | struct tcm_loop_tpg, tl_se_tpg); | |
944 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
945 | ||
946 | atomic_inc(&tl_tpg->tl_tpg_port_count); | |
947 | smp_mb__after_atomic_inc(); | |
948 | /* | |
949 | * Add Linux/SCSI struct scsi_device by HCTL | |
950 | */ | |
951 | scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); | |
952 | ||
953 | printk(KERN_INFO "TCM_Loop_ConfigFS: Port Link Successful\n"); | |
954 | return 0; | |
955 | } | |
956 | ||
957 | static void tcm_loop_port_unlink( | |
958 | struct se_portal_group *se_tpg, | |
959 | struct se_lun *se_lun) | |
960 | { | |
961 | struct scsi_device *sd; | |
962 | struct tcm_loop_hba *tl_hba; | |
963 | struct tcm_loop_tpg *tl_tpg; | |
964 | ||
965 | tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); | |
966 | tl_hba = tl_tpg->tl_hba; | |
967 | ||
968 | sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, | |
969 | se_lun->unpacked_lun); | |
970 | if (!sd) { | |
971 | printk(KERN_ERR "Unable to locate struct scsi_device for %d:%d:" | |
972 | "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); | |
973 | return; | |
974 | } | |
975 | /* | |
976 | * Remove Linux/SCSI struct scsi_device by HCTL | |
977 | */ | |
978 | scsi_remove_device(sd); | |
979 | scsi_device_put(sd); | |
980 | ||
981 | atomic_dec(&tl_tpg->tl_tpg_port_count); | |
982 | smp_mb__after_atomic_dec(); | |
983 | ||
984 | printk(KERN_INFO "TCM_Loop_ConfigFS: Port Unlink Successful\n"); | |
985 | } | |
986 | ||
987 | /* End items for tcm_loop_port_cit */ | |
988 | ||
989 | /* Start items for tcm_loop_nexus_cit */ | |
990 | ||
991 | static int tcm_loop_make_nexus( | |
992 | struct tcm_loop_tpg *tl_tpg, | |
993 | const char *name) | |
994 | { | |
995 | struct se_portal_group *se_tpg; | |
996 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
997 | struct tcm_loop_nexus *tl_nexus; | |
552523dc | 998 | int ret = -ENOMEM; |
3703b2c5 NB |
999 | |
1000 | if (tl_tpg->tl_hba->tl_nexus) { | |
1001 | printk(KERN_INFO "tl_tpg->tl_hba->tl_nexus already exists\n"); | |
1002 | return -EEXIST; | |
1003 | } | |
1004 | se_tpg = &tl_tpg->tl_se_tpg; | |
1005 | ||
1006 | tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); | |
1007 | if (!tl_nexus) { | |
1008 | printk(KERN_ERR "Unable to allocate struct tcm_loop_nexus\n"); | |
1009 | return -ENOMEM; | |
1010 | } | |
1011 | /* | |
1012 | * Initialize the struct se_session pointer | |
1013 | */ | |
1014 | tl_nexus->se_sess = transport_init_session(); | |
552523dc DC |
1015 | if (IS_ERR(tl_nexus->se_sess)) { |
1016 | ret = PTR_ERR(tl_nexus->se_sess); | |
3703b2c5 | 1017 | goto out; |
552523dc | 1018 | } |
3703b2c5 NB |
1019 | /* |
1020 | * Since we are running in 'demo mode' this call with generate a | |
1021 | * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI | |
1022 | * Initiator port name of the passed configfs group 'name'. | |
1023 | */ | |
1024 | tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1025 | se_tpg, (unsigned char *)name); | |
1026 | if (!tl_nexus->se_sess->se_node_acl) { | |
1027 | transport_free_session(tl_nexus->se_sess); | |
1028 | goto out; | |
1029 | } | |
1030 | /* | |
1031 | * Now, register the SAS I_T Nexus as active with the call to | |
1032 | * transport_register_session() | |
1033 | */ | |
1034 | __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, | |
5951146d | 1035 | tl_nexus->se_sess, tl_nexus); |
3703b2c5 NB |
1036 | tl_tpg->tl_hba->tl_nexus = tl_nexus; |
1037 | printk(KERN_INFO "TCM_Loop_ConfigFS: Established I_T Nexus to emulated" | |
1038 | " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), | |
1039 | name); | |
1040 | return 0; | |
1041 | ||
1042 | out: | |
1043 | kfree(tl_nexus); | |
552523dc | 1044 | return ret; |
3703b2c5 NB |
1045 | } |
1046 | ||
1047 | static int tcm_loop_drop_nexus( | |
1048 | struct tcm_loop_tpg *tpg) | |
1049 | { | |
1050 | struct se_session *se_sess; | |
1051 | struct tcm_loop_nexus *tl_nexus; | |
1052 | struct tcm_loop_hba *tl_hba = tpg->tl_hba; | |
1053 | ||
1054 | tl_nexus = tpg->tl_hba->tl_nexus; | |
1055 | if (!tl_nexus) | |
1056 | return -ENODEV; | |
1057 | ||
1058 | se_sess = tl_nexus->se_sess; | |
1059 | if (!se_sess) | |
1060 | return -ENODEV; | |
1061 | ||
1062 | if (atomic_read(&tpg->tl_tpg_port_count)) { | |
1063 | printk(KERN_ERR "Unable to remove TCM_Loop I_T Nexus with" | |
1064 | " active TPG port count: %d\n", | |
1065 | atomic_read(&tpg->tl_tpg_port_count)); | |
1066 | return -EPERM; | |
1067 | } | |
1068 | ||
1069 | printk(KERN_INFO "TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" | |
1070 | " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), | |
1071 | tl_nexus->se_sess->se_node_acl->initiatorname); | |
1072 | /* | |
1073 | * Release the SCSI I_T Nexus to the emulated SAS Target Port | |
1074 | */ | |
1075 | transport_deregister_session(tl_nexus->se_sess); | |
1076 | tpg->tl_hba->tl_nexus = NULL; | |
1077 | kfree(tl_nexus); | |
1078 | return 0; | |
1079 | } | |
1080 | ||
1081 | /* End items for tcm_loop_nexus_cit */ | |
1082 | ||
1083 | static ssize_t tcm_loop_tpg_show_nexus( | |
1084 | struct se_portal_group *se_tpg, | |
1085 | char *page) | |
1086 | { | |
1087 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1088 | struct tcm_loop_tpg, tl_se_tpg); | |
1089 | struct tcm_loop_nexus *tl_nexus; | |
1090 | ssize_t ret; | |
1091 | ||
1092 | tl_nexus = tl_tpg->tl_hba->tl_nexus; | |
1093 | if (!tl_nexus) | |
1094 | return -ENODEV; | |
1095 | ||
1096 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1097 | tl_nexus->se_sess->se_node_acl->initiatorname); | |
1098 | ||
1099 | return ret; | |
1100 | } | |
1101 | ||
1102 | static ssize_t tcm_loop_tpg_store_nexus( | |
1103 | struct se_portal_group *se_tpg, | |
1104 | const char *page, | |
1105 | size_t count) | |
1106 | { | |
1107 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1108 | struct tcm_loop_tpg, tl_se_tpg); | |
1109 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
1110 | unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; | |
1111 | int ret; | |
1112 | /* | |
1113 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
1114 | */ | |
1115 | if (!strncmp(page, "NULL", 4)) { | |
1116 | ret = tcm_loop_drop_nexus(tl_tpg); | |
1117 | return (!ret) ? count : ret; | |
1118 | } | |
1119 | /* | |
1120 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1121 | * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call | |
1122 | * tcm_loop_make_nexus() | |
1123 | */ | |
60d645a4 | 1124 | if (strlen(page) >= TL_WWN_ADDR_LEN) { |
3703b2c5 NB |
1125 | printk(KERN_ERR "Emulated NAA Sas Address: %s, exceeds" |
1126 | " max: %d\n", page, TL_WWN_ADDR_LEN); | |
1127 | return -EINVAL; | |
1128 | } | |
1129 | snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); | |
1130 | ||
1131 | ptr = strstr(i_port, "naa."); | |
1132 | if (ptr) { | |
1133 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { | |
1134 | printk(KERN_ERR "Passed SAS Initiator Port %s does not" | |
1135 | " match target port protoid: %s\n", i_port, | |
1136 | tcm_loop_dump_proto_id(tl_hba)); | |
1137 | return -EINVAL; | |
1138 | } | |
1139 | port_ptr = &i_port[0]; | |
1140 | goto check_newline; | |
1141 | } | |
1142 | ptr = strstr(i_port, "fc."); | |
1143 | if (ptr) { | |
1144 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { | |
1145 | printk(KERN_ERR "Passed FCP Initiator Port %s does not" | |
1146 | " match target port protoid: %s\n", i_port, | |
1147 | tcm_loop_dump_proto_id(tl_hba)); | |
1148 | return -EINVAL; | |
1149 | } | |
1150 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1151 | goto check_newline; | |
1152 | } | |
1153 | ptr = strstr(i_port, "iqn."); | |
1154 | if (ptr) { | |
1155 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { | |
1156 | printk(KERN_ERR "Passed iSCSI Initiator Port %s does not" | |
1157 | " match target port protoid: %s\n", i_port, | |
1158 | tcm_loop_dump_proto_id(tl_hba)); | |
1159 | return -EINVAL; | |
1160 | } | |
1161 | port_ptr = &i_port[0]; | |
1162 | goto check_newline; | |
1163 | } | |
1164 | printk(KERN_ERR "Unable to locate prefix for emulated Initiator Port:" | |
1165 | " %s\n", i_port); | |
1166 | return -EINVAL; | |
1167 | /* | |
1168 | * Clear any trailing newline for the NAA WWN | |
1169 | */ | |
1170 | check_newline: | |
1171 | if (i_port[strlen(i_port)-1] == '\n') | |
1172 | i_port[strlen(i_port)-1] = '\0'; | |
1173 | ||
1174 | ret = tcm_loop_make_nexus(tl_tpg, port_ptr); | |
1175 | if (ret < 0) | |
1176 | return ret; | |
1177 | ||
1178 | return count; | |
1179 | } | |
1180 | ||
1181 | TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); | |
1182 | ||
1183 | static struct configfs_attribute *tcm_loop_tpg_attrs[] = { | |
1184 | &tcm_loop_tpg_nexus.attr, | |
1185 | NULL, | |
1186 | }; | |
1187 | ||
1188 | /* Start items for tcm_loop_naa_cit */ | |
1189 | ||
1190 | struct se_portal_group *tcm_loop_make_naa_tpg( | |
1191 | struct se_wwn *wwn, | |
1192 | struct config_group *group, | |
1193 | const char *name) | |
1194 | { | |
1195 | struct tcm_loop_hba *tl_hba = container_of(wwn, | |
1196 | struct tcm_loop_hba, tl_hba_wwn); | |
1197 | struct tcm_loop_tpg *tl_tpg; | |
1198 | char *tpgt_str, *end_ptr; | |
1199 | int ret; | |
1200 | unsigned short int tpgt; | |
1201 | ||
1202 | tpgt_str = strstr(name, "tpgt_"); | |
1203 | if (!tpgt_str) { | |
1204 | printk(KERN_ERR "Unable to locate \"tpgt_#\" directory" | |
1205 | " group\n"); | |
1206 | return ERR_PTR(-EINVAL); | |
1207 | } | |
1208 | tpgt_str += 5; /* Skip ahead of "tpgt_" */ | |
1209 | tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0); | |
1210 | ||
1211 | if (tpgt > TL_TPGS_PER_HBA) { | |
1212 | printk(KERN_ERR "Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:" | |
1213 | " %u\n", tpgt, TL_TPGS_PER_HBA); | |
1214 | return ERR_PTR(-EINVAL); | |
1215 | } | |
1216 | tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; | |
1217 | tl_tpg->tl_hba = tl_hba; | |
1218 | tl_tpg->tl_tpgt = tpgt; | |
1219 | /* | |
1220 | * Register the tl_tpg as a emulated SAS TCM Target Endpoint | |
1221 | */ | |
1222 | ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops, | |
5951146d | 1223 | wwn, &tl_tpg->tl_se_tpg, tl_tpg, |
3703b2c5 NB |
1224 | TRANSPORT_TPG_TYPE_NORMAL); |
1225 | if (ret < 0) | |
1226 | return ERR_PTR(-ENOMEM); | |
1227 | ||
1228 | printk(KERN_INFO "TCM_Loop_ConfigFS: Allocated Emulated %s" | |
1229 | " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), | |
1230 | config_item_name(&wwn->wwn_group.cg_item), tpgt); | |
1231 | ||
1232 | return &tl_tpg->tl_se_tpg; | |
1233 | } | |
1234 | ||
1235 | void tcm_loop_drop_naa_tpg( | |
1236 | struct se_portal_group *se_tpg) | |
1237 | { | |
1238 | struct se_wwn *wwn = se_tpg->se_tpg_wwn; | |
1239 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1240 | struct tcm_loop_tpg, tl_se_tpg); | |
1241 | struct tcm_loop_hba *tl_hba; | |
1242 | unsigned short tpgt; | |
1243 | ||
1244 | tl_hba = tl_tpg->tl_hba; | |
1245 | tpgt = tl_tpg->tl_tpgt; | |
1246 | /* | |
1247 | * Release the I_T Nexus for the Virtual SAS link if present | |
1248 | */ | |
1249 | tcm_loop_drop_nexus(tl_tpg); | |
1250 | /* | |
1251 | * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint | |
1252 | */ | |
1253 | core_tpg_deregister(se_tpg); | |
1254 | ||
1255 | printk(KERN_INFO "TCM_Loop_ConfigFS: Deallocated Emulated %s" | |
1256 | " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), | |
1257 | config_item_name(&wwn->wwn_group.cg_item), tpgt); | |
1258 | } | |
1259 | ||
1260 | /* End items for tcm_loop_naa_cit */ | |
1261 | ||
1262 | /* Start items for tcm_loop_cit */ | |
1263 | ||
1264 | struct se_wwn *tcm_loop_make_scsi_hba( | |
1265 | struct target_fabric_configfs *tf, | |
1266 | struct config_group *group, | |
1267 | const char *name) | |
1268 | { | |
1269 | struct tcm_loop_hba *tl_hba; | |
1270 | struct Scsi_Host *sh; | |
1271 | char *ptr; | |
1272 | int ret, off = 0; | |
1273 | ||
1274 | tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); | |
1275 | if (!tl_hba) { | |
1276 | printk(KERN_ERR "Unable to allocate struct tcm_loop_hba\n"); | |
1277 | return ERR_PTR(-ENOMEM); | |
1278 | } | |
1279 | /* | |
1280 | * Determine the emulated Protocol Identifier and Target Port Name | |
1281 | * based on the incoming configfs directory name. | |
1282 | */ | |
1283 | ptr = strstr(name, "naa."); | |
1284 | if (ptr) { | |
1285 | tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; | |
1286 | goto check_len; | |
1287 | } | |
1288 | ptr = strstr(name, "fc."); | |
1289 | if (ptr) { | |
1290 | tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; | |
1291 | off = 3; /* Skip over "fc." */ | |
1292 | goto check_len; | |
1293 | } | |
1294 | ptr = strstr(name, "iqn."); | |
1295 | if (ptr) { | |
1296 | tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; | |
1297 | goto check_len; | |
1298 | } | |
1299 | ||
1300 | printk(KERN_ERR "Unable to locate prefix for emulated Target Port:" | |
1301 | " %s\n", name); | |
1302 | return ERR_PTR(-EINVAL); | |
1303 | ||
1304 | check_len: | |
60d645a4 | 1305 | if (strlen(name) >= TL_WWN_ADDR_LEN) { |
3703b2c5 NB |
1306 | printk(KERN_ERR "Emulated NAA %s Address: %s, exceeds" |
1307 | " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), | |
1308 | TL_WWN_ADDR_LEN); | |
1309 | kfree(tl_hba); | |
1310 | return ERR_PTR(-EINVAL); | |
1311 | } | |
1312 | snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); | |
1313 | ||
1314 | /* | |
1315 | * Call device_register(tl_hba->dev) to register the emulated | |
1316 | * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after | |
1317 | * device_register() callbacks in tcm_loop_driver_probe() | |
1318 | */ | |
1319 | ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); | |
1320 | if (ret) | |
1321 | goto out; | |
1322 | ||
1323 | sh = tl_hba->sh; | |
1324 | tcm_loop_hba_no_cnt++; | |
1325 | printk(KERN_INFO "TCM_Loop_ConfigFS: Allocated emulated Target" | |
1326 | " %s Address: %s at Linux/SCSI Host ID: %d\n", | |
1327 | tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); | |
1328 | ||
1329 | return &tl_hba->tl_hba_wwn; | |
1330 | out: | |
1331 | kfree(tl_hba); | |
1332 | return ERR_PTR(ret); | |
1333 | } | |
1334 | ||
1335 | void tcm_loop_drop_scsi_hba( | |
1336 | struct se_wwn *wwn) | |
1337 | { | |
1338 | struct tcm_loop_hba *tl_hba = container_of(wwn, | |
1339 | struct tcm_loop_hba, tl_hba_wwn); | |
1340 | int host_no = tl_hba->sh->host_no; | |
1341 | /* | |
1342 | * Call device_unregister() on the original tl_hba->dev. | |
1343 | * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will | |
1344 | * release *tl_hba; | |
1345 | */ | |
1346 | device_unregister(&tl_hba->dev); | |
1347 | ||
1348 | printk(KERN_INFO "TCM_Loop_ConfigFS: Deallocated emulated Target" | |
1349 | " SAS Address: %s at Linux/SCSI Host ID: %d\n", | |
1350 | config_item_name(&wwn->wwn_group.cg_item), host_no); | |
1351 | } | |
1352 | ||
1353 | /* Start items for tcm_loop_cit */ | |
1354 | static ssize_t tcm_loop_wwn_show_attr_version( | |
1355 | struct target_fabric_configfs *tf, | |
1356 | char *page) | |
1357 | { | |
1358 | return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); | |
1359 | } | |
1360 | ||
1361 | TF_WWN_ATTR_RO(tcm_loop, version); | |
1362 | ||
1363 | static struct configfs_attribute *tcm_loop_wwn_attrs[] = { | |
1364 | &tcm_loop_wwn_version.attr, | |
1365 | NULL, | |
1366 | }; | |
1367 | ||
1368 | /* End items for tcm_loop_cit */ | |
1369 | ||
1370 | static int tcm_loop_register_configfs(void) | |
1371 | { | |
1372 | struct target_fabric_configfs *fabric; | |
1373 | struct config_group *tf_cg; | |
1374 | int ret; | |
1375 | /* | |
1376 | * Set the TCM Loop HBA counter to zero | |
1377 | */ | |
1378 | tcm_loop_hba_no_cnt = 0; | |
1379 | /* | |
1380 | * Register the top level struct config_item_type with TCM core | |
1381 | */ | |
1382 | fabric = target_fabric_configfs_init(THIS_MODULE, "loopback"); | |
e3d6f909 | 1383 | if (IS_ERR(fabric)) { |
3703b2c5 | 1384 | printk(KERN_ERR "tcm_loop_register_configfs() failed!\n"); |
e3d6f909 | 1385 | return PTR_ERR(fabric); |
3703b2c5 NB |
1386 | } |
1387 | /* | |
1388 | * Setup the fabric API of function pointers used by target_core_mod | |
1389 | */ | |
1390 | fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name; | |
1391 | fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident; | |
1392 | fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn; | |
1393 | fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag; | |
1394 | fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth; | |
1395 | fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id; | |
1396 | fabric->tf_ops.tpg_get_pr_transport_id_len = | |
1397 | &tcm_loop_get_pr_transport_id_len; | |
1398 | fabric->tf_ops.tpg_parse_pr_out_transport_id = | |
1399 | &tcm_loop_parse_pr_out_transport_id; | |
1400 | fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode; | |
1401 | fabric->tf_ops.tpg_check_demo_mode_cache = | |
1402 | &tcm_loop_check_demo_mode_cache; | |
1403 | fabric->tf_ops.tpg_check_demo_mode_write_protect = | |
1404 | &tcm_loop_check_demo_mode_write_protect; | |
1405 | fabric->tf_ops.tpg_check_prod_mode_write_protect = | |
1406 | &tcm_loop_check_prod_mode_write_protect; | |
1407 | /* | |
1408 | * The TCM loopback fabric module runs in demo-mode to a local | |
1409 | * virtual SCSI device, so fabric dependent initator ACLs are | |
1410 | * not required. | |
1411 | */ | |
1412 | fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl; | |
1413 | fabric->tf_ops.tpg_release_fabric_acl = | |
1414 | &tcm_loop_tpg_release_fabric_acl; | |
1415 | fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index; | |
3703b2c5 NB |
1416 | /* |
1417 | * Used for setting up remaining TCM resources in process context | |
1418 | */ | |
1419 | fabric->tf_ops.new_cmd_map = &tcm_loop_new_cmd_map; | |
1420 | fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free; | |
1421 | fabric->tf_ops.release_cmd_to_pool = &tcm_loop_deallocate_core_cmd; | |
1422 | fabric->tf_ops.release_cmd_direct = &tcm_loop_deallocate_core_cmd; | |
1423 | fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session; | |
1424 | fabric->tf_ops.close_session = &tcm_loop_close_session; | |
1425 | fabric->tf_ops.stop_session = &tcm_loop_stop_session; | |
1426 | fabric->tf_ops.fall_back_to_erl0 = &tcm_loop_fall_back_to_erl0; | |
1427 | fabric->tf_ops.sess_logged_in = &tcm_loop_sess_logged_in; | |
1428 | fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index; | |
1429 | fabric->tf_ops.sess_get_initiator_sid = NULL; | |
1430 | fabric->tf_ops.write_pending = &tcm_loop_write_pending; | |
1431 | fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status; | |
1432 | /* | |
1433 | * Not used for TCM loopback | |
1434 | */ | |
1435 | fabric->tf_ops.set_default_node_attributes = | |
1436 | &tcm_loop_set_default_node_attributes; | |
1437 | fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag; | |
1438 | fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state; | |
3703b2c5 NB |
1439 | fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in; |
1440 | fabric->tf_ops.queue_status = &tcm_loop_queue_status; | |
1441 | fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp; | |
1442 | fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len; | |
1443 | fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len; | |
1444 | fabric->tf_ops.is_state_remove = &tcm_loop_is_state_remove; | |
3703b2c5 NB |
1445 | |
1446 | tf_cg = &fabric->tf_group; | |
1447 | /* | |
1448 | * Setup function pointers for generic logic in target_core_fabric_configfs.c | |
1449 | */ | |
1450 | fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba; | |
1451 | fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba; | |
1452 | fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg; | |
1453 | fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg; | |
1454 | /* | |
1455 | * fabric_post_link() and fabric_pre_unlink() are used for | |
1456 | * registration and release of TCM Loop Virtual SCSI LUNs. | |
1457 | */ | |
1458 | fabric->tf_ops.fabric_post_link = &tcm_loop_port_link; | |
1459 | fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink; | |
1460 | fabric->tf_ops.fabric_make_np = NULL; | |
1461 | fabric->tf_ops.fabric_drop_np = NULL; | |
1462 | /* | |
1463 | * Setup default attribute lists for various fabric->tf_cit_tmpl | |
1464 | */ | |
1465 | TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs; | |
1466 | TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs; | |
1467 | TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL; | |
1468 | TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL; | |
1469 | TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL; | |
1470 | /* | |
1471 | * Once fabric->tf_ops has been setup, now register the fabric for | |
1472 | * use within TCM | |
1473 | */ | |
1474 | ret = target_fabric_configfs_register(fabric); | |
1475 | if (ret < 0) { | |
1476 | printk(KERN_ERR "target_fabric_configfs_register() for" | |
1477 | " TCM_Loop failed!\n"); | |
1478 | target_fabric_configfs_free(fabric); | |
1479 | return -1; | |
1480 | } | |
1481 | /* | |
1482 | * Setup our local pointer to *fabric. | |
1483 | */ | |
1484 | tcm_loop_fabric_configfs = fabric; | |
1485 | printk(KERN_INFO "TCM_LOOP[0] - Set fabric ->" | |
1486 | " tcm_loop_fabric_configfs\n"); | |
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | static void tcm_loop_deregister_configfs(void) | |
1491 | { | |
1492 | if (!tcm_loop_fabric_configfs) | |
1493 | return; | |
1494 | ||
1495 | target_fabric_configfs_deregister(tcm_loop_fabric_configfs); | |
1496 | tcm_loop_fabric_configfs = NULL; | |
1497 | printk(KERN_INFO "TCM_LOOP[0] - Cleared" | |
1498 | " tcm_loop_fabric_configfs\n"); | |
1499 | } | |
1500 | ||
1501 | static int __init tcm_loop_fabric_init(void) | |
1502 | { | |
1503 | int ret; | |
1504 | ||
1505 | tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", | |
1506 | sizeof(struct tcm_loop_cmd), | |
1507 | __alignof__(struct tcm_loop_cmd), | |
1508 | 0, NULL); | |
1509 | if (!tcm_loop_cmd_cache) { | |
1510 | printk(KERN_ERR "kmem_cache_create() for" | |
1511 | " tcm_loop_cmd_cache failed\n"); | |
1512 | return -ENOMEM; | |
1513 | } | |
1514 | ||
1515 | ret = tcm_loop_alloc_core_bus(); | |
1516 | if (ret) | |
1517 | return ret; | |
1518 | ||
1519 | ret = tcm_loop_register_configfs(); | |
1520 | if (ret) { | |
1521 | tcm_loop_release_core_bus(); | |
1522 | return ret; | |
1523 | } | |
1524 | ||
1525 | return 0; | |
1526 | } | |
1527 | ||
1528 | static void __exit tcm_loop_fabric_exit(void) | |
1529 | { | |
1530 | tcm_loop_deregister_configfs(); | |
1531 | tcm_loop_release_core_bus(); | |
1532 | kmem_cache_destroy(tcm_loop_cmd_cache); | |
1533 | } | |
1534 | ||
1535 | MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); | |
1536 | MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>"); | |
1537 | MODULE_LICENSE("GPL"); | |
1538 | module_init(tcm_loop_fabric_init); | |
1539 | module_exit(tcm_loop_fabric_exit); |