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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> | |
36 | #include <target/target_core_transport.h> | |
37 | #include <target/target_core_fabric_ops.h> | |
38 | #include <target/target_core_fabric_configfs.h> | |
39 | #include <target/target_core_fabric_lib.h> | |
40 | #include <target/target_core_configfs.h> | |
41 | #include <target/target_core_device.h> | |
42 | #include <target/target_core_tpg.h> | |
43 | #include <target/target_core_tmr.h> | |
44 | ||
45 | #include "tcm_loop.h" | |
46 | ||
47 | #define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev) | |
48 | ||
49 | /* Local pointer to allocated TCM configfs fabric module */ | |
50 | static struct target_fabric_configfs *tcm_loop_fabric_configfs; | |
51 | ||
52 | static struct kmem_cache *tcm_loop_cmd_cache; | |
53 | ||
54 | static int tcm_loop_hba_no_cnt; | |
55 | ||
56 | /* | |
57 | * Allocate a tcm_loop cmd descriptor from target_core_mod code | |
58 | * | |
59 | * Can be called from interrupt context in tcm_loop_queuecommand() below | |
60 | */ | |
61 | static struct se_cmd *tcm_loop_allocate_core_cmd( | |
62 | struct tcm_loop_hba *tl_hba, | |
63 | struct se_portal_group *se_tpg, | |
64 | struct scsi_cmnd *sc) | |
65 | { | |
66 | struct se_cmd *se_cmd; | |
67 | struct se_session *se_sess; | |
68 | struct tcm_loop_nexus *tl_nexus = tl_hba->tl_nexus; | |
69 | struct tcm_loop_cmd *tl_cmd; | |
70 | int sam_task_attr; | |
71 | ||
72 | if (!tl_nexus) { | |
73 | scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus" | |
74 | " does not exist\n"); | |
75 | set_host_byte(sc, DID_ERROR); | |
76 | return NULL; | |
77 | } | |
78 | se_sess = tl_nexus->se_sess; | |
79 | ||
80 | tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC); | |
81 | if (!tl_cmd) { | |
6708bb27 | 82 | pr_err("Unable to allocate struct tcm_loop_cmd\n"); |
3703b2c5 NB |
83 | set_host_byte(sc, DID_ERROR); |
84 | return NULL; | |
85 | } | |
86 | se_cmd = &tl_cmd->tl_se_cmd; | |
87 | /* | |
88 | * Save the pointer to struct scsi_cmnd *sc | |
89 | */ | |
90 | tl_cmd->sc = sc; | |
91 | /* | |
92 | * Locate the SAM Task Attr from struct scsi_cmnd * | |
93 | */ | |
94 | if (sc->device->tagged_supported) { | |
95 | switch (sc->tag) { | |
96 | case HEAD_OF_QUEUE_TAG: | |
61db1802 | 97 | sam_task_attr = MSG_HEAD_TAG; |
3703b2c5 NB |
98 | break; |
99 | case ORDERED_QUEUE_TAG: | |
61db1802 | 100 | sam_task_attr = MSG_ORDERED_TAG; |
3703b2c5 NB |
101 | break; |
102 | default: | |
61db1802 | 103 | sam_task_attr = MSG_SIMPLE_TAG; |
3703b2c5 NB |
104 | break; |
105 | } | |
106 | } else | |
61db1802 | 107 | sam_task_attr = MSG_SIMPLE_TAG; |
3703b2c5 NB |
108 | |
109 | /* | |
110 | * Initialize struct se_cmd descriptor from target_core_mod infrastructure | |
111 | */ | |
112 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, | |
113 | scsi_bufflen(sc), sc->sc_data_direction, sam_task_attr, | |
114 | &tl_cmd->tl_sense_buf[0]); | |
115 | ||
116 | /* | |
117 | * Signal BIDI usage with T_TASK(cmd)->t_tasks_bidi | |
118 | */ | |
119 | if (scsi_bidi_cmnd(sc)) | |
a1d8b49a | 120 | se_cmd->t_tasks_bidi = 1; |
3703b2c5 NB |
121 | /* |
122 | * Locate the struct se_lun pointer and attach it to struct se_cmd | |
123 | */ | |
5951146d | 124 | if (transport_lookup_cmd_lun(se_cmd, tl_cmd->sc->device->lun) < 0) { |
3703b2c5 NB |
125 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); |
126 | set_host_byte(sc, DID_NO_CONNECT); | |
127 | return NULL; | |
128 | } | |
129 | ||
3703b2c5 NB |
130 | return se_cmd; |
131 | } | |
132 | ||
133 | /* | |
134 | * Called by struct target_core_fabric_ops->new_cmd_map() | |
135 | * | |
136 | * Always called in process context. A non zero return value | |
137 | * here will signal to handle an exception based on the return code. | |
138 | */ | |
139 | static int tcm_loop_new_cmd_map(struct se_cmd *se_cmd) | |
140 | { | |
141 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
142 | struct tcm_loop_cmd, tl_se_cmd); | |
143 | struct scsi_cmnd *sc = tl_cmd->sc; | |
5951146d AG |
144 | struct scatterlist *sgl_bidi = NULL; |
145 | u32 sgl_bidi_count = 0; | |
3703b2c5 NB |
146 | int ret; |
147 | /* | |
148 | * Allocate the necessary tasks to complete the received CDB+data | |
149 | */ | |
5951146d AG |
150 | ret = transport_generic_allocate_tasks(se_cmd, sc->cmnd); |
151 | if (ret == -ENOMEM) { | |
3703b2c5 NB |
152 | /* Out of Resources */ |
153 | return PYX_TRANSPORT_LU_COMM_FAILURE; | |
5951146d | 154 | } else if (ret == -EINVAL) { |
3703b2c5 NB |
155 | /* |
156 | * Handle case for SAM_STAT_RESERVATION_CONFLICT | |
157 | */ | |
158 | if (se_cmd->se_cmd_flags & SCF_SCSI_RESERVATION_CONFLICT) | |
159 | return PYX_TRANSPORT_RESERVATION_CONFLICT; | |
160 | /* | |
161 | * Otherwise, return SAM_STAT_CHECK_CONDITION and return | |
162 | * sense data. | |
163 | */ | |
164 | return PYX_TRANSPORT_USE_SENSE_REASON; | |
165 | } | |
5951146d | 166 | |
3703b2c5 | 167 | /* |
5951146d AG |
168 | * For BIDI commands, pass in the extra READ buffer |
169 | * to transport_generic_map_mem_to_cmd() below.. | |
3703b2c5 | 170 | */ |
a1d8b49a | 171 | if (se_cmd->t_tasks_bidi) { |
5951146d | 172 | struct scsi_data_buffer *sdb = scsi_in(sc); |
3703b2c5 | 173 | |
5951146d AG |
174 | sgl_bidi = sdb->table.sgl; |
175 | sgl_bidi_count = sdb->table.nents; | |
3703b2c5 | 176 | } |
5951146d | 177 | |
ec98f782 | 178 | /* Tell the core about our preallocated memory */ |
5951146d AG |
179 | ret = transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc), |
180 | scsi_sg_count(sc), sgl_bidi, sgl_bidi_count); | |
3703b2c5 NB |
181 | if (ret < 0) |
182 | return PYX_TRANSPORT_LU_COMM_FAILURE; | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Called from struct target_core_fabric_ops->check_stop_free() | |
189 | */ | |
190 | static void tcm_loop_check_stop_free(struct se_cmd *se_cmd) | |
191 | { | |
192 | /* | |
193 | * Do not release struct se_cmd's containing a valid TMR | |
194 | * pointer. These will be released directly in tcm_loop_device_reset() | |
195 | * with transport_generic_free_cmd(). | |
196 | */ | |
197 | if (se_cmd->se_tmr_req) | |
198 | return; | |
199 | /* | |
200 | * Release the struct se_cmd, which will make a callback to release | |
201 | * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd() | |
202 | */ | |
82f1c8a4 | 203 | transport_generic_free_cmd(se_cmd, 0); |
3703b2c5 NB |
204 | } |
205 | ||
35462975 | 206 | static void tcm_loop_release_cmd(struct se_cmd *se_cmd) |
3703b2c5 NB |
207 | { |
208 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
209 | struct tcm_loop_cmd, tl_se_cmd); | |
210 | ||
211 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); | |
212 | } | |
213 | ||
214 | static int tcm_loop_proc_info(struct Scsi_Host *host, char *buffer, | |
215 | char **start, off_t offset, | |
216 | int length, int inout) | |
217 | { | |
218 | return sprintf(buffer, "tcm_loop_proc_info()\n"); | |
219 | } | |
220 | ||
221 | static int tcm_loop_driver_probe(struct device *); | |
222 | static int tcm_loop_driver_remove(struct device *); | |
223 | ||
224 | static int pseudo_lld_bus_match(struct device *dev, | |
225 | struct device_driver *dev_driver) | |
226 | { | |
227 | return 1; | |
228 | } | |
229 | ||
230 | static struct bus_type tcm_loop_lld_bus = { | |
231 | .name = "tcm_loop_bus", | |
232 | .match = pseudo_lld_bus_match, | |
233 | .probe = tcm_loop_driver_probe, | |
234 | .remove = tcm_loop_driver_remove, | |
235 | }; | |
236 | ||
237 | static struct device_driver tcm_loop_driverfs = { | |
238 | .name = "tcm_loop", | |
239 | .bus = &tcm_loop_lld_bus, | |
240 | }; | |
241 | /* | |
242 | * Used with root_device_register() in tcm_loop_alloc_core_bus() below | |
243 | */ | |
244 | struct device *tcm_loop_primary; | |
245 | ||
246 | /* | |
247 | * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and | |
248 | * drivers/scsi/libiscsi.c:iscsi_change_queue_depth() | |
249 | */ | |
250 | static int tcm_loop_change_queue_depth( | |
251 | struct scsi_device *sdev, | |
252 | int depth, | |
253 | int reason) | |
254 | { | |
255 | switch (reason) { | |
256 | case SCSI_QDEPTH_DEFAULT: | |
257 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
258 | break; | |
259 | case SCSI_QDEPTH_QFULL: | |
260 | scsi_track_queue_full(sdev, depth); | |
261 | break; | |
262 | case SCSI_QDEPTH_RAMP_UP: | |
263 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
264 | break; | |
265 | default: | |
266 | return -EOPNOTSUPP; | |
267 | } | |
268 | return sdev->queue_depth; | |
269 | } | |
270 | ||
271 | /* | |
272 | * Main entry point from struct scsi_host_template for incoming SCSI CDB+Data | |
273 | * from Linux/SCSI subsystem for SCSI low level device drivers (LLDs) | |
274 | */ | |
275 | static int tcm_loop_queuecommand( | |
276 | struct Scsi_Host *sh, | |
277 | struct scsi_cmnd *sc) | |
278 | { | |
279 | struct se_cmd *se_cmd; | |
280 | struct se_portal_group *se_tpg; | |
281 | struct tcm_loop_hba *tl_hba; | |
282 | struct tcm_loop_tpg *tl_tpg; | |
283 | ||
6708bb27 | 284 | pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x" |
3703b2c5 NB |
285 | " scsi_buf_len: %u\n", sc->device->host->host_no, |
286 | sc->device->id, sc->device->channel, sc->device->lun, | |
287 | sc->cmnd[0], scsi_bufflen(sc)); | |
288 | /* | |
289 | * Locate the tcm_loop_hba_t pointer | |
290 | */ | |
291 | tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); | |
292 | tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; | |
293 | se_tpg = &tl_tpg->tl_se_tpg; | |
294 | /* | |
295 | * Determine the SAM Task Attribute and allocate tl_cmd and | |
296 | * tl_cmd->tl_se_cmd from TCM infrastructure | |
297 | */ | |
298 | se_cmd = tcm_loop_allocate_core_cmd(tl_hba, se_tpg, sc); | |
299 | if (!se_cmd) { | |
300 | sc->scsi_done(sc); | |
301 | return 0; | |
302 | } | |
303 | /* | |
304 | * Queue up the newly allocated to be processed in TCM thread context. | |
305 | */ | |
306 | transport_generic_handle_cdb_map(se_cmd); | |
307 | return 0; | |
308 | } | |
309 | ||
310 | /* | |
311 | * Called from SCSI EH process context to issue a LUN_RESET TMR | |
312 | * to struct scsi_device | |
313 | */ | |
314 | static int tcm_loop_device_reset(struct scsi_cmnd *sc) | |
315 | { | |
316 | struct se_cmd *se_cmd = NULL; | |
317 | struct se_portal_group *se_tpg; | |
318 | struct se_session *se_sess; | |
319 | struct tcm_loop_cmd *tl_cmd = NULL; | |
320 | struct tcm_loop_hba *tl_hba; | |
321 | struct tcm_loop_nexus *tl_nexus; | |
322 | struct tcm_loop_tmr *tl_tmr = NULL; | |
323 | struct tcm_loop_tpg *tl_tpg; | |
324 | int ret = FAILED; | |
325 | /* | |
326 | * Locate the tcm_loop_hba_t pointer | |
327 | */ | |
328 | tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); | |
329 | /* | |
330 | * Locate the tl_nexus and se_sess pointers | |
331 | */ | |
332 | tl_nexus = tl_hba->tl_nexus; | |
333 | if (!tl_nexus) { | |
6708bb27 | 334 | pr_err("Unable to perform device reset without" |
3703b2c5 NB |
335 | " active I_T Nexus\n"); |
336 | return FAILED; | |
337 | } | |
338 | se_sess = tl_nexus->se_sess; | |
339 | /* | |
340 | * Locate the tl_tpg and se_tpg pointers from TargetID in sc->device->id | |
341 | */ | |
342 | tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; | |
343 | se_tpg = &tl_tpg->tl_se_tpg; | |
344 | ||
345 | tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); | |
346 | if (!tl_cmd) { | |
6708bb27 | 347 | pr_err("Unable to allocate memory for tl_cmd\n"); |
3703b2c5 NB |
348 | return FAILED; |
349 | } | |
350 | ||
351 | tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL); | |
352 | if (!tl_tmr) { | |
6708bb27 | 353 | pr_err("Unable to allocate memory for tl_tmr\n"); |
3703b2c5 NB |
354 | goto release; |
355 | } | |
356 | init_waitqueue_head(&tl_tmr->tl_tmr_wait); | |
357 | ||
358 | se_cmd = &tl_cmd->tl_se_cmd; | |
359 | /* | |
360 | * Initialize struct se_cmd descriptor from target_core_mod infrastructure | |
361 | */ | |
362 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0, | |
61db1802 | 363 | DMA_NONE, MSG_SIMPLE_TAG, |
3703b2c5 NB |
364 | &tl_cmd->tl_sense_buf[0]); |
365 | /* | |
366 | * Allocate the LUN_RESET TMR | |
367 | */ | |
5951146d | 368 | se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd, tl_tmr, |
3703b2c5 | 369 | TMR_LUN_RESET); |
552523dc | 370 | if (IS_ERR(se_cmd->se_tmr_req)) |
3703b2c5 NB |
371 | goto release; |
372 | /* | |
373 | * Locate the underlying TCM struct se_lun from sc->device->lun | |
374 | */ | |
5951146d | 375 | if (transport_lookup_tmr_lun(se_cmd, sc->device->lun) < 0) |
3703b2c5 NB |
376 | goto release; |
377 | /* | |
378 | * Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp() | |
379 | * to wake us up. | |
380 | */ | |
381 | transport_generic_handle_tmr(se_cmd); | |
382 | wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete)); | |
383 | /* | |
384 | * The TMR LUN_RESET has completed, check the response status and | |
385 | * then release allocations. | |
386 | */ | |
387 | ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? | |
388 | SUCCESS : FAILED; | |
389 | release: | |
390 | if (se_cmd) | |
82f1c8a4 | 391 | transport_generic_free_cmd(se_cmd, 1); |
3703b2c5 NB |
392 | else |
393 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); | |
394 | kfree(tl_tmr); | |
395 | return ret; | |
396 | } | |
397 | ||
398 | static int tcm_loop_slave_alloc(struct scsi_device *sd) | |
399 | { | |
400 | set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags); | |
401 | return 0; | |
402 | } | |
403 | ||
404 | static int tcm_loop_slave_configure(struct scsi_device *sd) | |
405 | { | |
406 | return 0; | |
407 | } | |
408 | ||
409 | static struct scsi_host_template tcm_loop_driver_template = { | |
410 | .proc_info = tcm_loop_proc_info, | |
411 | .proc_name = "tcm_loopback", | |
412 | .name = "TCM_Loopback", | |
413 | .queuecommand = tcm_loop_queuecommand, | |
414 | .change_queue_depth = tcm_loop_change_queue_depth, | |
415 | .eh_device_reset_handler = tcm_loop_device_reset, | |
416 | .can_queue = TL_SCSI_CAN_QUEUE, | |
417 | .this_id = -1, | |
418 | .sg_tablesize = TL_SCSI_SG_TABLESIZE, | |
419 | .cmd_per_lun = TL_SCSI_CMD_PER_LUN, | |
420 | .max_sectors = TL_SCSI_MAX_SECTORS, | |
421 | .use_clustering = DISABLE_CLUSTERING, | |
422 | .slave_alloc = tcm_loop_slave_alloc, | |
423 | .slave_configure = tcm_loop_slave_configure, | |
424 | .module = THIS_MODULE, | |
425 | }; | |
426 | ||
427 | static int tcm_loop_driver_probe(struct device *dev) | |
428 | { | |
429 | struct tcm_loop_hba *tl_hba; | |
430 | struct Scsi_Host *sh; | |
431 | int error; | |
432 | ||
433 | tl_hba = to_tcm_loop_hba(dev); | |
434 | ||
435 | sh = scsi_host_alloc(&tcm_loop_driver_template, | |
436 | sizeof(struct tcm_loop_hba)); | |
437 | if (!sh) { | |
6708bb27 | 438 | pr_err("Unable to allocate struct scsi_host\n"); |
3703b2c5 NB |
439 | return -ENODEV; |
440 | } | |
441 | tl_hba->sh = sh; | |
442 | ||
443 | /* | |
444 | * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata | |
445 | */ | |
446 | *((struct tcm_loop_hba **)sh->hostdata) = tl_hba; | |
447 | /* | |
448 | * Setup single ID, Channel and LUN for now.. | |
449 | */ | |
450 | sh->max_id = 2; | |
451 | sh->max_lun = 0; | |
452 | sh->max_channel = 0; | |
453 | sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN; | |
454 | ||
455 | error = scsi_add_host(sh, &tl_hba->dev); | |
456 | if (error) { | |
6708bb27 | 457 | pr_err("%s: scsi_add_host failed\n", __func__); |
3703b2c5 NB |
458 | scsi_host_put(sh); |
459 | return -ENODEV; | |
460 | } | |
461 | return 0; | |
462 | } | |
463 | ||
464 | static int tcm_loop_driver_remove(struct device *dev) | |
465 | { | |
466 | struct tcm_loop_hba *tl_hba; | |
467 | struct Scsi_Host *sh; | |
468 | ||
469 | tl_hba = to_tcm_loop_hba(dev); | |
470 | sh = tl_hba->sh; | |
471 | ||
472 | scsi_remove_host(sh); | |
473 | scsi_host_put(sh); | |
474 | return 0; | |
475 | } | |
476 | ||
477 | static void tcm_loop_release_adapter(struct device *dev) | |
478 | { | |
479 | struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev); | |
480 | ||
481 | kfree(tl_hba); | |
482 | } | |
483 | ||
484 | /* | |
485 | * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c | |
486 | */ | |
487 | static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id) | |
488 | { | |
489 | int ret; | |
490 | ||
491 | tl_hba->dev.bus = &tcm_loop_lld_bus; | |
492 | tl_hba->dev.parent = tcm_loop_primary; | |
493 | tl_hba->dev.release = &tcm_loop_release_adapter; | |
494 | dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id); | |
495 | ||
496 | ret = device_register(&tl_hba->dev); | |
497 | if (ret) { | |
6708bb27 | 498 | pr_err("device_register() failed for" |
3703b2c5 NB |
499 | " tl_hba->dev: %d\n", ret); |
500 | return -ENODEV; | |
501 | } | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
506 | /* | |
507 | * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated | |
508 | * tcm_loop SCSI bus. | |
509 | */ | |
510 | static int tcm_loop_alloc_core_bus(void) | |
511 | { | |
512 | int ret; | |
513 | ||
514 | tcm_loop_primary = root_device_register("tcm_loop_0"); | |
515 | if (IS_ERR(tcm_loop_primary)) { | |
6708bb27 | 516 | pr_err("Unable to allocate tcm_loop_primary\n"); |
3703b2c5 NB |
517 | return PTR_ERR(tcm_loop_primary); |
518 | } | |
519 | ||
520 | ret = bus_register(&tcm_loop_lld_bus); | |
521 | if (ret) { | |
6708bb27 | 522 | pr_err("bus_register() failed for tcm_loop_lld_bus\n"); |
3703b2c5 NB |
523 | goto dev_unreg; |
524 | } | |
525 | ||
526 | ret = driver_register(&tcm_loop_driverfs); | |
527 | if (ret) { | |
6708bb27 | 528 | pr_err("driver_register() failed for" |
3703b2c5 NB |
529 | "tcm_loop_driverfs\n"); |
530 | goto bus_unreg; | |
531 | } | |
532 | ||
6708bb27 | 533 | pr_debug("Initialized TCM Loop Core Bus\n"); |
3703b2c5 NB |
534 | return ret; |
535 | ||
536 | bus_unreg: | |
537 | bus_unregister(&tcm_loop_lld_bus); | |
538 | dev_unreg: | |
539 | root_device_unregister(tcm_loop_primary); | |
540 | return ret; | |
541 | } | |
542 | ||
543 | static void tcm_loop_release_core_bus(void) | |
544 | { | |
545 | driver_unregister(&tcm_loop_driverfs); | |
546 | bus_unregister(&tcm_loop_lld_bus); | |
547 | root_device_unregister(tcm_loop_primary); | |
548 | ||
6708bb27 | 549 | pr_debug("Releasing TCM Loop Core BUS\n"); |
3703b2c5 NB |
550 | } |
551 | ||
552 | static char *tcm_loop_get_fabric_name(void) | |
553 | { | |
554 | return "loopback"; | |
555 | } | |
556 | ||
557 | static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg) | |
558 | { | |
559 | struct tcm_loop_tpg *tl_tpg = | |
560 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
561 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
562 | /* | |
563 | * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba() | |
564 | * time based on the protocol dependent prefix of the passed configfs group. | |
565 | * | |
566 | * Based upon tl_proto_id, TCM_Loop emulates the requested fabric | |
567 | * ProtocolID using target_core_fabric_lib.c symbols. | |
568 | */ | |
569 | switch (tl_hba->tl_proto_id) { | |
570 | case SCSI_PROTOCOL_SAS: | |
571 | return sas_get_fabric_proto_ident(se_tpg); | |
572 | case SCSI_PROTOCOL_FCP: | |
573 | return fc_get_fabric_proto_ident(se_tpg); | |
574 | case SCSI_PROTOCOL_ISCSI: | |
575 | return iscsi_get_fabric_proto_ident(se_tpg); | |
576 | default: | |
6708bb27 | 577 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
578 | " SAS emulation\n", tl_hba->tl_proto_id); |
579 | break; | |
580 | } | |
581 | ||
582 | return sas_get_fabric_proto_ident(se_tpg); | |
583 | } | |
584 | ||
585 | static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg) | |
586 | { | |
587 | struct tcm_loop_tpg *tl_tpg = | |
588 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
589 | /* | |
590 | * Return the passed NAA identifier for the SAS Target Port | |
591 | */ | |
592 | return &tl_tpg->tl_hba->tl_wwn_address[0]; | |
593 | } | |
594 | ||
595 | static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg) | |
596 | { | |
597 | struct tcm_loop_tpg *tl_tpg = | |
598 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
599 | /* | |
600 | * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 | |
601 | * to represent the SCSI Target Port. | |
602 | */ | |
603 | return tl_tpg->tl_tpgt; | |
604 | } | |
605 | ||
606 | static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg) | |
607 | { | |
608 | return 1; | |
609 | } | |
610 | ||
611 | static u32 tcm_loop_get_pr_transport_id( | |
612 | struct se_portal_group *se_tpg, | |
613 | struct se_node_acl *se_nacl, | |
614 | struct t10_pr_registration *pr_reg, | |
615 | int *format_code, | |
616 | unsigned char *buf) | |
617 | { | |
618 | struct tcm_loop_tpg *tl_tpg = | |
619 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
620 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
621 | ||
622 | switch (tl_hba->tl_proto_id) { | |
623 | case SCSI_PROTOCOL_SAS: | |
624 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
625 | format_code, buf); | |
626 | case SCSI_PROTOCOL_FCP: | |
627 | return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
628 | format_code, buf); | |
629 | case SCSI_PROTOCOL_ISCSI: | |
630 | return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
631 | format_code, buf); | |
632 | default: | |
6708bb27 | 633 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
634 | " SAS emulation\n", tl_hba->tl_proto_id); |
635 | break; | |
636 | } | |
637 | ||
638 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
639 | format_code, buf); | |
640 | } | |
641 | ||
642 | static u32 tcm_loop_get_pr_transport_id_len( | |
643 | struct se_portal_group *se_tpg, | |
644 | struct se_node_acl *se_nacl, | |
645 | struct t10_pr_registration *pr_reg, | |
646 | int *format_code) | |
647 | { | |
648 | struct tcm_loop_tpg *tl_tpg = | |
649 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
650 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
651 | ||
652 | switch (tl_hba->tl_proto_id) { | |
653 | case SCSI_PROTOCOL_SAS: | |
654 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
655 | format_code); | |
656 | case SCSI_PROTOCOL_FCP: | |
657 | return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
658 | format_code); | |
659 | case SCSI_PROTOCOL_ISCSI: | |
660 | return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
661 | format_code); | |
662 | default: | |
6708bb27 | 663 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
664 | " SAS emulation\n", tl_hba->tl_proto_id); |
665 | break; | |
666 | } | |
667 | ||
668 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
669 | format_code); | |
670 | } | |
671 | ||
672 | /* | |
673 | * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above | |
674 | * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. | |
675 | */ | |
676 | static char *tcm_loop_parse_pr_out_transport_id( | |
677 | struct se_portal_group *se_tpg, | |
678 | const char *buf, | |
679 | u32 *out_tid_len, | |
680 | char **port_nexus_ptr) | |
681 | { | |
682 | struct tcm_loop_tpg *tl_tpg = | |
683 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
684 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
685 | ||
686 | switch (tl_hba->tl_proto_id) { | |
687 | case SCSI_PROTOCOL_SAS: | |
688 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
689 | port_nexus_ptr); | |
690 | case SCSI_PROTOCOL_FCP: | |
691 | return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
692 | port_nexus_ptr); | |
693 | case SCSI_PROTOCOL_ISCSI: | |
694 | return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
695 | port_nexus_ptr); | |
696 | default: | |
6708bb27 | 697 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
698 | " SAS emulation\n", tl_hba->tl_proto_id); |
699 | break; | |
700 | } | |
701 | ||
702 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
703 | port_nexus_ptr); | |
704 | } | |
705 | ||
706 | /* | |
707 | * Returning (1) here allows for target_core_mod struct se_node_acl to be generated | |
708 | * based upon the incoming fabric dependent SCSI Initiator Port | |
709 | */ | |
710 | static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) | |
711 | { | |
712 | return 1; | |
713 | } | |
714 | ||
715 | static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) | |
716 | { | |
717 | return 0; | |
718 | } | |
719 | ||
720 | /* | |
721 | * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for | |
722 | * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest | |
723 | */ | |
724 | static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) | |
725 | { | |
726 | return 0; | |
727 | } | |
728 | ||
729 | /* | |
730 | * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will | |
731 | * never be called for TCM_Loop by target_core_fabric_configfs.c code. | |
732 | * It has been added here as a nop for target_fabric_tf_ops_check() | |
733 | */ | |
734 | static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) | |
735 | { | |
736 | return 0; | |
737 | } | |
738 | ||
739 | static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl( | |
740 | struct se_portal_group *se_tpg) | |
741 | { | |
742 | struct tcm_loop_nacl *tl_nacl; | |
743 | ||
744 | tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL); | |
745 | if (!tl_nacl) { | |
6708bb27 | 746 | pr_err("Unable to allocate struct tcm_loop_nacl\n"); |
3703b2c5 NB |
747 | return NULL; |
748 | } | |
749 | ||
750 | return &tl_nacl->se_node_acl; | |
751 | } | |
752 | ||
753 | static void tcm_loop_tpg_release_fabric_acl( | |
754 | struct se_portal_group *se_tpg, | |
755 | struct se_node_acl *se_nacl) | |
756 | { | |
757 | struct tcm_loop_nacl *tl_nacl = container_of(se_nacl, | |
758 | struct tcm_loop_nacl, se_node_acl); | |
759 | ||
760 | kfree(tl_nacl); | |
761 | } | |
762 | ||
763 | static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) | |
764 | { | |
765 | return 1; | |
766 | } | |
767 | ||
3703b2c5 NB |
768 | static int tcm_loop_is_state_remove(struct se_cmd *se_cmd) |
769 | { | |
770 | /* | |
771 | * Assume struct scsi_cmnd is not in remove state.. | |
772 | */ | |
773 | return 0; | |
774 | } | |
775 | ||
776 | static int tcm_loop_sess_logged_in(struct se_session *se_sess) | |
777 | { | |
778 | /* | |
779 | * Assume that TL Nexus is always active | |
780 | */ | |
781 | return 1; | |
782 | } | |
783 | ||
784 | static u32 tcm_loop_sess_get_index(struct se_session *se_sess) | |
785 | { | |
786 | return 1; | |
787 | } | |
788 | ||
789 | static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) | |
790 | { | |
791 | return; | |
792 | } | |
793 | ||
794 | static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd) | |
795 | { | |
796 | return 1; | |
797 | } | |
798 | ||
799 | static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) | |
800 | { | |
801 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
802 | struct tcm_loop_cmd, tl_se_cmd); | |
803 | ||
804 | return tl_cmd->sc_cmd_state; | |
805 | } | |
806 | ||
807 | static int tcm_loop_shutdown_session(struct se_session *se_sess) | |
808 | { | |
809 | return 0; | |
810 | } | |
811 | ||
812 | static void tcm_loop_close_session(struct se_session *se_sess) | |
813 | { | |
814 | return; | |
815 | }; | |
816 | ||
817 | static void tcm_loop_stop_session( | |
818 | struct se_session *se_sess, | |
819 | int sess_sleep, | |
820 | int conn_sleep) | |
821 | { | |
822 | return; | |
823 | } | |
824 | ||
825 | static void tcm_loop_fall_back_to_erl0(struct se_session *se_sess) | |
826 | { | |
827 | return; | |
828 | } | |
829 | ||
830 | static int tcm_loop_write_pending(struct se_cmd *se_cmd) | |
831 | { | |
832 | /* | |
833 | * Since Linux/SCSI has already sent down a struct scsi_cmnd | |
834 | * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array | |
835 | * memory, and memory has already been mapped to struct se_cmd->t_mem_list | |
836 | * format with transport_generic_map_mem_to_cmd(). | |
837 | * | |
838 | * We now tell TCM to add this WRITE CDB directly into the TCM storage | |
839 | * object execution queue. | |
840 | */ | |
841 | transport_generic_process_write(se_cmd); | |
842 | return 0; | |
843 | } | |
844 | ||
845 | static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) | |
846 | { | |
847 | return 0; | |
848 | } | |
849 | ||
850 | static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) | |
851 | { | |
852 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
853 | struct tcm_loop_cmd, tl_se_cmd); | |
854 | struct scsi_cmnd *sc = tl_cmd->sc; | |
855 | ||
6708bb27 | 856 | pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" |
3703b2c5 NB |
857 | " cdb: 0x%02x\n", sc, sc->cmnd[0]); |
858 | ||
859 | sc->result = SAM_STAT_GOOD; | |
860 | set_host_byte(sc, DID_OK); | |
861 | sc->scsi_done(sc); | |
862 | return 0; | |
863 | } | |
864 | ||
865 | static int tcm_loop_queue_status(struct se_cmd *se_cmd) | |
866 | { | |
867 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
868 | struct tcm_loop_cmd, tl_se_cmd); | |
869 | struct scsi_cmnd *sc = tl_cmd->sc; | |
870 | ||
6708bb27 | 871 | pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" |
3703b2c5 NB |
872 | " cdb: 0x%02x\n", sc, sc->cmnd[0]); |
873 | ||
874 | if (se_cmd->sense_buffer && | |
875 | ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || | |
876 | (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { | |
877 | ||
5951146d | 878 | memcpy(sc->sense_buffer, se_cmd->sense_buffer, |
3703b2c5 NB |
879 | SCSI_SENSE_BUFFERSIZE); |
880 | sc->result = SAM_STAT_CHECK_CONDITION; | |
881 | set_driver_byte(sc, DRIVER_SENSE); | |
882 | } else | |
883 | sc->result = se_cmd->scsi_status; | |
884 | ||
885 | set_host_byte(sc, DID_OK); | |
886 | sc->scsi_done(sc); | |
887 | return 0; | |
888 | } | |
889 | ||
890 | static int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) | |
891 | { | |
892 | struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; | |
893 | struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; | |
894 | /* | |
895 | * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead | |
896 | * and wake up the wait_queue_head_t in tcm_loop_device_reset() | |
897 | */ | |
898 | atomic_set(&tl_tmr->tmr_complete, 1); | |
899 | wake_up(&tl_tmr->tl_tmr_wait); | |
900 | return 0; | |
901 | } | |
902 | ||
903 | static u16 tcm_loop_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length) | |
904 | { | |
905 | return 0; | |
906 | } | |
907 | ||
908 | static u16 tcm_loop_get_fabric_sense_len(void) | |
909 | { | |
910 | return 0; | |
911 | } | |
912 | ||
3703b2c5 NB |
913 | static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) |
914 | { | |
915 | switch (tl_hba->tl_proto_id) { | |
916 | case SCSI_PROTOCOL_SAS: | |
917 | return "SAS"; | |
918 | case SCSI_PROTOCOL_FCP: | |
919 | return "FCP"; | |
920 | case SCSI_PROTOCOL_ISCSI: | |
921 | return "iSCSI"; | |
922 | default: | |
923 | break; | |
924 | } | |
925 | ||
926 | return "Unknown"; | |
927 | } | |
928 | ||
929 | /* Start items for tcm_loop_port_cit */ | |
930 | ||
931 | static int tcm_loop_port_link( | |
932 | struct se_portal_group *se_tpg, | |
933 | struct se_lun *lun) | |
934 | { | |
935 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
936 | struct tcm_loop_tpg, tl_se_tpg); | |
937 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
938 | ||
939 | atomic_inc(&tl_tpg->tl_tpg_port_count); | |
940 | smp_mb__after_atomic_inc(); | |
941 | /* | |
942 | * Add Linux/SCSI struct scsi_device by HCTL | |
943 | */ | |
944 | scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); | |
945 | ||
6708bb27 | 946 | pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); |
3703b2c5 NB |
947 | return 0; |
948 | } | |
949 | ||
950 | static void tcm_loop_port_unlink( | |
951 | struct se_portal_group *se_tpg, | |
952 | struct se_lun *se_lun) | |
953 | { | |
954 | struct scsi_device *sd; | |
955 | struct tcm_loop_hba *tl_hba; | |
956 | struct tcm_loop_tpg *tl_tpg; | |
957 | ||
958 | tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); | |
959 | tl_hba = tl_tpg->tl_hba; | |
960 | ||
961 | sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, | |
962 | se_lun->unpacked_lun); | |
963 | if (!sd) { | |
6708bb27 | 964 | pr_err("Unable to locate struct scsi_device for %d:%d:" |
3703b2c5 NB |
965 | "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); |
966 | return; | |
967 | } | |
968 | /* | |
969 | * Remove Linux/SCSI struct scsi_device by HCTL | |
970 | */ | |
971 | scsi_remove_device(sd); | |
972 | scsi_device_put(sd); | |
973 | ||
974 | atomic_dec(&tl_tpg->tl_tpg_port_count); | |
975 | smp_mb__after_atomic_dec(); | |
976 | ||
6708bb27 | 977 | pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); |
3703b2c5 NB |
978 | } |
979 | ||
980 | /* End items for tcm_loop_port_cit */ | |
981 | ||
982 | /* Start items for tcm_loop_nexus_cit */ | |
983 | ||
984 | static int tcm_loop_make_nexus( | |
985 | struct tcm_loop_tpg *tl_tpg, | |
986 | const char *name) | |
987 | { | |
988 | struct se_portal_group *se_tpg; | |
989 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
990 | struct tcm_loop_nexus *tl_nexus; | |
552523dc | 991 | int ret = -ENOMEM; |
3703b2c5 NB |
992 | |
993 | if (tl_tpg->tl_hba->tl_nexus) { | |
6708bb27 | 994 | pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n"); |
3703b2c5 NB |
995 | return -EEXIST; |
996 | } | |
997 | se_tpg = &tl_tpg->tl_se_tpg; | |
998 | ||
999 | tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); | |
1000 | if (!tl_nexus) { | |
6708bb27 | 1001 | pr_err("Unable to allocate struct tcm_loop_nexus\n"); |
3703b2c5 NB |
1002 | return -ENOMEM; |
1003 | } | |
1004 | /* | |
1005 | * Initialize the struct se_session pointer | |
1006 | */ | |
1007 | tl_nexus->se_sess = transport_init_session(); | |
552523dc DC |
1008 | if (IS_ERR(tl_nexus->se_sess)) { |
1009 | ret = PTR_ERR(tl_nexus->se_sess); | |
3703b2c5 | 1010 | goto out; |
552523dc | 1011 | } |
3703b2c5 NB |
1012 | /* |
1013 | * Since we are running in 'demo mode' this call with generate a | |
1014 | * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI | |
1015 | * Initiator port name of the passed configfs group 'name'. | |
1016 | */ | |
1017 | tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1018 | se_tpg, (unsigned char *)name); | |
1019 | if (!tl_nexus->se_sess->se_node_acl) { | |
1020 | transport_free_session(tl_nexus->se_sess); | |
1021 | goto out; | |
1022 | } | |
1023 | /* | |
1024 | * Now, register the SAS I_T Nexus as active with the call to | |
1025 | * transport_register_session() | |
1026 | */ | |
1027 | __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, | |
5951146d | 1028 | tl_nexus->se_sess, tl_nexus); |
3703b2c5 | 1029 | tl_tpg->tl_hba->tl_nexus = tl_nexus; |
6708bb27 | 1030 | pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" |
3703b2c5 NB |
1031 | " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), |
1032 | name); | |
1033 | return 0; | |
1034 | ||
1035 | out: | |
1036 | kfree(tl_nexus); | |
552523dc | 1037 | return ret; |
3703b2c5 NB |
1038 | } |
1039 | ||
1040 | static int tcm_loop_drop_nexus( | |
1041 | struct tcm_loop_tpg *tpg) | |
1042 | { | |
1043 | struct se_session *se_sess; | |
1044 | struct tcm_loop_nexus *tl_nexus; | |
1045 | struct tcm_loop_hba *tl_hba = tpg->tl_hba; | |
1046 | ||
1047 | tl_nexus = tpg->tl_hba->tl_nexus; | |
1048 | if (!tl_nexus) | |
1049 | return -ENODEV; | |
1050 | ||
1051 | se_sess = tl_nexus->se_sess; | |
1052 | if (!se_sess) | |
1053 | return -ENODEV; | |
1054 | ||
1055 | if (atomic_read(&tpg->tl_tpg_port_count)) { | |
6708bb27 | 1056 | pr_err("Unable to remove TCM_Loop I_T Nexus with" |
3703b2c5 NB |
1057 | " active TPG port count: %d\n", |
1058 | atomic_read(&tpg->tl_tpg_port_count)); | |
1059 | return -EPERM; | |
1060 | } | |
1061 | ||
6708bb27 | 1062 | pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" |
3703b2c5 NB |
1063 | " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), |
1064 | tl_nexus->se_sess->se_node_acl->initiatorname); | |
1065 | /* | |
1066 | * Release the SCSI I_T Nexus to the emulated SAS Target Port | |
1067 | */ | |
1068 | transport_deregister_session(tl_nexus->se_sess); | |
1069 | tpg->tl_hba->tl_nexus = NULL; | |
1070 | kfree(tl_nexus); | |
1071 | return 0; | |
1072 | } | |
1073 | ||
1074 | /* End items for tcm_loop_nexus_cit */ | |
1075 | ||
1076 | static ssize_t tcm_loop_tpg_show_nexus( | |
1077 | struct se_portal_group *se_tpg, | |
1078 | char *page) | |
1079 | { | |
1080 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1081 | struct tcm_loop_tpg, tl_se_tpg); | |
1082 | struct tcm_loop_nexus *tl_nexus; | |
1083 | ssize_t ret; | |
1084 | ||
1085 | tl_nexus = tl_tpg->tl_hba->tl_nexus; | |
1086 | if (!tl_nexus) | |
1087 | return -ENODEV; | |
1088 | ||
1089 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1090 | tl_nexus->se_sess->se_node_acl->initiatorname); | |
1091 | ||
1092 | return ret; | |
1093 | } | |
1094 | ||
1095 | static ssize_t tcm_loop_tpg_store_nexus( | |
1096 | struct se_portal_group *se_tpg, | |
1097 | const char *page, | |
1098 | size_t count) | |
1099 | { | |
1100 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1101 | struct tcm_loop_tpg, tl_se_tpg); | |
1102 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
1103 | unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; | |
1104 | int ret; | |
1105 | /* | |
1106 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
1107 | */ | |
1108 | if (!strncmp(page, "NULL", 4)) { | |
1109 | ret = tcm_loop_drop_nexus(tl_tpg); | |
1110 | return (!ret) ? count : ret; | |
1111 | } | |
1112 | /* | |
1113 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1114 | * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call | |
1115 | * tcm_loop_make_nexus() | |
1116 | */ | |
60d645a4 | 1117 | if (strlen(page) >= TL_WWN_ADDR_LEN) { |
6708bb27 | 1118 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
3703b2c5 NB |
1119 | " max: %d\n", page, TL_WWN_ADDR_LEN); |
1120 | return -EINVAL; | |
1121 | } | |
1122 | snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); | |
1123 | ||
1124 | ptr = strstr(i_port, "naa."); | |
1125 | if (ptr) { | |
1126 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { | |
6708bb27 | 1127 | pr_err("Passed SAS Initiator Port %s does not" |
3703b2c5 NB |
1128 | " match target port protoid: %s\n", i_port, |
1129 | tcm_loop_dump_proto_id(tl_hba)); | |
1130 | return -EINVAL; | |
1131 | } | |
1132 | port_ptr = &i_port[0]; | |
1133 | goto check_newline; | |
1134 | } | |
1135 | ptr = strstr(i_port, "fc."); | |
1136 | if (ptr) { | |
1137 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { | |
6708bb27 | 1138 | pr_err("Passed FCP Initiator Port %s does not" |
3703b2c5 NB |
1139 | " match target port protoid: %s\n", i_port, |
1140 | tcm_loop_dump_proto_id(tl_hba)); | |
1141 | return -EINVAL; | |
1142 | } | |
1143 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1144 | goto check_newline; | |
1145 | } | |
1146 | ptr = strstr(i_port, "iqn."); | |
1147 | if (ptr) { | |
1148 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { | |
6708bb27 | 1149 | pr_err("Passed iSCSI Initiator Port %s does not" |
3703b2c5 NB |
1150 | " match target port protoid: %s\n", i_port, |
1151 | tcm_loop_dump_proto_id(tl_hba)); | |
1152 | return -EINVAL; | |
1153 | } | |
1154 | port_ptr = &i_port[0]; | |
1155 | goto check_newline; | |
1156 | } | |
6708bb27 | 1157 | pr_err("Unable to locate prefix for emulated Initiator Port:" |
3703b2c5 NB |
1158 | " %s\n", i_port); |
1159 | return -EINVAL; | |
1160 | /* | |
1161 | * Clear any trailing newline for the NAA WWN | |
1162 | */ | |
1163 | check_newline: | |
1164 | if (i_port[strlen(i_port)-1] == '\n') | |
1165 | i_port[strlen(i_port)-1] = '\0'; | |
1166 | ||
1167 | ret = tcm_loop_make_nexus(tl_tpg, port_ptr); | |
1168 | if (ret < 0) | |
1169 | return ret; | |
1170 | ||
1171 | return count; | |
1172 | } | |
1173 | ||
1174 | TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); | |
1175 | ||
1176 | static struct configfs_attribute *tcm_loop_tpg_attrs[] = { | |
1177 | &tcm_loop_tpg_nexus.attr, | |
1178 | NULL, | |
1179 | }; | |
1180 | ||
1181 | /* Start items for tcm_loop_naa_cit */ | |
1182 | ||
1183 | struct se_portal_group *tcm_loop_make_naa_tpg( | |
1184 | struct se_wwn *wwn, | |
1185 | struct config_group *group, | |
1186 | const char *name) | |
1187 | { | |
1188 | struct tcm_loop_hba *tl_hba = container_of(wwn, | |
1189 | struct tcm_loop_hba, tl_hba_wwn); | |
1190 | struct tcm_loop_tpg *tl_tpg; | |
1191 | char *tpgt_str, *end_ptr; | |
1192 | int ret; | |
1193 | unsigned short int tpgt; | |
1194 | ||
1195 | tpgt_str = strstr(name, "tpgt_"); | |
1196 | if (!tpgt_str) { | |
6708bb27 | 1197 | pr_err("Unable to locate \"tpgt_#\" directory" |
3703b2c5 NB |
1198 | " group\n"); |
1199 | return ERR_PTR(-EINVAL); | |
1200 | } | |
1201 | tpgt_str += 5; /* Skip ahead of "tpgt_" */ | |
1202 | tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0); | |
1203 | ||
12f09ccb | 1204 | if (tpgt >= TL_TPGS_PER_HBA) { |
6708bb27 | 1205 | pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:" |
3703b2c5 NB |
1206 | " %u\n", tpgt, TL_TPGS_PER_HBA); |
1207 | return ERR_PTR(-EINVAL); | |
1208 | } | |
1209 | tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; | |
1210 | tl_tpg->tl_hba = tl_hba; | |
1211 | tl_tpg->tl_tpgt = tpgt; | |
1212 | /* | |
1213 | * Register the tl_tpg as a emulated SAS TCM Target Endpoint | |
1214 | */ | |
1215 | ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops, | |
5951146d | 1216 | wwn, &tl_tpg->tl_se_tpg, tl_tpg, |
3703b2c5 NB |
1217 | TRANSPORT_TPG_TYPE_NORMAL); |
1218 | if (ret < 0) | |
1219 | return ERR_PTR(-ENOMEM); | |
1220 | ||
6708bb27 | 1221 | pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" |
3703b2c5 NB |
1222 | " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), |
1223 | config_item_name(&wwn->wwn_group.cg_item), tpgt); | |
1224 | ||
1225 | return &tl_tpg->tl_se_tpg; | |
1226 | } | |
1227 | ||
1228 | void tcm_loop_drop_naa_tpg( | |
1229 | struct se_portal_group *se_tpg) | |
1230 | { | |
1231 | struct se_wwn *wwn = se_tpg->se_tpg_wwn; | |
1232 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1233 | struct tcm_loop_tpg, tl_se_tpg); | |
1234 | struct tcm_loop_hba *tl_hba; | |
1235 | unsigned short tpgt; | |
1236 | ||
1237 | tl_hba = tl_tpg->tl_hba; | |
1238 | tpgt = tl_tpg->tl_tpgt; | |
1239 | /* | |
1240 | * Release the I_T Nexus for the Virtual SAS link if present | |
1241 | */ | |
1242 | tcm_loop_drop_nexus(tl_tpg); | |
1243 | /* | |
1244 | * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint | |
1245 | */ | |
1246 | core_tpg_deregister(se_tpg); | |
1247 | ||
6708bb27 | 1248 | pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" |
3703b2c5 NB |
1249 | " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), |
1250 | config_item_name(&wwn->wwn_group.cg_item), tpgt); | |
1251 | } | |
1252 | ||
1253 | /* End items for tcm_loop_naa_cit */ | |
1254 | ||
1255 | /* Start items for tcm_loop_cit */ | |
1256 | ||
1257 | struct se_wwn *tcm_loop_make_scsi_hba( | |
1258 | struct target_fabric_configfs *tf, | |
1259 | struct config_group *group, | |
1260 | const char *name) | |
1261 | { | |
1262 | struct tcm_loop_hba *tl_hba; | |
1263 | struct Scsi_Host *sh; | |
1264 | char *ptr; | |
1265 | int ret, off = 0; | |
1266 | ||
1267 | tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); | |
1268 | if (!tl_hba) { | |
6708bb27 | 1269 | pr_err("Unable to allocate struct tcm_loop_hba\n"); |
3703b2c5 NB |
1270 | return ERR_PTR(-ENOMEM); |
1271 | } | |
1272 | /* | |
1273 | * Determine the emulated Protocol Identifier and Target Port Name | |
1274 | * based on the incoming configfs directory name. | |
1275 | */ | |
1276 | ptr = strstr(name, "naa."); | |
1277 | if (ptr) { | |
1278 | tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; | |
1279 | goto check_len; | |
1280 | } | |
1281 | ptr = strstr(name, "fc."); | |
1282 | if (ptr) { | |
1283 | tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; | |
1284 | off = 3; /* Skip over "fc." */ | |
1285 | goto check_len; | |
1286 | } | |
1287 | ptr = strstr(name, "iqn."); | |
a57b5d36 | 1288 | if (!ptr) { |
6708bb27 | 1289 | pr_err("Unable to locate prefix for emulated Target " |
a57b5d36 JJ |
1290 | "Port: %s\n", name); |
1291 | ret = -EINVAL; | |
1292 | goto out; | |
3703b2c5 | 1293 | } |
a57b5d36 | 1294 | tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; |
3703b2c5 NB |
1295 | |
1296 | check_len: | |
60d645a4 | 1297 | if (strlen(name) >= TL_WWN_ADDR_LEN) { |
6708bb27 | 1298 | pr_err("Emulated NAA %s Address: %s, exceeds" |
3703b2c5 NB |
1299 | " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), |
1300 | TL_WWN_ADDR_LEN); | |
a57b5d36 JJ |
1301 | ret = -EINVAL; |
1302 | goto out; | |
3703b2c5 NB |
1303 | } |
1304 | snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); | |
1305 | ||
1306 | /* | |
1307 | * Call device_register(tl_hba->dev) to register the emulated | |
1308 | * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after | |
1309 | * device_register() callbacks in tcm_loop_driver_probe() | |
1310 | */ | |
1311 | ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); | |
1312 | if (ret) | |
1313 | goto out; | |
1314 | ||
1315 | sh = tl_hba->sh; | |
1316 | tcm_loop_hba_no_cnt++; | |
6708bb27 | 1317 | pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" |
3703b2c5 NB |
1318 | " %s Address: %s at Linux/SCSI Host ID: %d\n", |
1319 | tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); | |
1320 | ||
1321 | return &tl_hba->tl_hba_wwn; | |
1322 | out: | |
1323 | kfree(tl_hba); | |
1324 | return ERR_PTR(ret); | |
1325 | } | |
1326 | ||
1327 | void tcm_loop_drop_scsi_hba( | |
1328 | struct se_wwn *wwn) | |
1329 | { | |
1330 | struct tcm_loop_hba *tl_hba = container_of(wwn, | |
1331 | struct tcm_loop_hba, tl_hba_wwn); | |
1332 | int host_no = tl_hba->sh->host_no; | |
1333 | /* | |
1334 | * Call device_unregister() on the original tl_hba->dev. | |
1335 | * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will | |
1336 | * release *tl_hba; | |
1337 | */ | |
1338 | device_unregister(&tl_hba->dev); | |
1339 | ||
6708bb27 | 1340 | pr_debug("TCM_Loop_ConfigFS: Deallocated emulated Target" |
3703b2c5 NB |
1341 | " SAS Address: %s at Linux/SCSI Host ID: %d\n", |
1342 | config_item_name(&wwn->wwn_group.cg_item), host_no); | |
1343 | } | |
1344 | ||
1345 | /* Start items for tcm_loop_cit */ | |
1346 | static ssize_t tcm_loop_wwn_show_attr_version( | |
1347 | struct target_fabric_configfs *tf, | |
1348 | char *page) | |
1349 | { | |
1350 | return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); | |
1351 | } | |
1352 | ||
1353 | TF_WWN_ATTR_RO(tcm_loop, version); | |
1354 | ||
1355 | static struct configfs_attribute *tcm_loop_wwn_attrs[] = { | |
1356 | &tcm_loop_wwn_version.attr, | |
1357 | NULL, | |
1358 | }; | |
1359 | ||
1360 | /* End items for tcm_loop_cit */ | |
1361 | ||
1362 | static int tcm_loop_register_configfs(void) | |
1363 | { | |
1364 | struct target_fabric_configfs *fabric; | |
1365 | struct config_group *tf_cg; | |
1366 | int ret; | |
1367 | /* | |
1368 | * Set the TCM Loop HBA counter to zero | |
1369 | */ | |
1370 | tcm_loop_hba_no_cnt = 0; | |
1371 | /* | |
1372 | * Register the top level struct config_item_type with TCM core | |
1373 | */ | |
1374 | fabric = target_fabric_configfs_init(THIS_MODULE, "loopback"); | |
e3d6f909 | 1375 | if (IS_ERR(fabric)) { |
6708bb27 | 1376 | pr_err("tcm_loop_register_configfs() failed!\n"); |
e3d6f909 | 1377 | return PTR_ERR(fabric); |
3703b2c5 NB |
1378 | } |
1379 | /* | |
1380 | * Setup the fabric API of function pointers used by target_core_mod | |
1381 | */ | |
1382 | fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name; | |
1383 | fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident; | |
1384 | fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn; | |
1385 | fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag; | |
1386 | fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth; | |
1387 | fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id; | |
1388 | fabric->tf_ops.tpg_get_pr_transport_id_len = | |
1389 | &tcm_loop_get_pr_transport_id_len; | |
1390 | fabric->tf_ops.tpg_parse_pr_out_transport_id = | |
1391 | &tcm_loop_parse_pr_out_transport_id; | |
1392 | fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode; | |
1393 | fabric->tf_ops.tpg_check_demo_mode_cache = | |
1394 | &tcm_loop_check_demo_mode_cache; | |
1395 | fabric->tf_ops.tpg_check_demo_mode_write_protect = | |
1396 | &tcm_loop_check_demo_mode_write_protect; | |
1397 | fabric->tf_ops.tpg_check_prod_mode_write_protect = | |
1398 | &tcm_loop_check_prod_mode_write_protect; | |
1399 | /* | |
1400 | * The TCM loopback fabric module runs in demo-mode to a local | |
1401 | * virtual SCSI device, so fabric dependent initator ACLs are | |
1402 | * not required. | |
1403 | */ | |
1404 | fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl; | |
1405 | fabric->tf_ops.tpg_release_fabric_acl = | |
1406 | &tcm_loop_tpg_release_fabric_acl; | |
1407 | fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index; | |
3703b2c5 NB |
1408 | /* |
1409 | * Used for setting up remaining TCM resources in process context | |
1410 | */ | |
1411 | fabric->tf_ops.new_cmd_map = &tcm_loop_new_cmd_map; | |
1412 | fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free; | |
35462975 | 1413 | fabric->tf_ops.release_cmd = &tcm_loop_release_cmd; |
3703b2c5 NB |
1414 | fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session; |
1415 | fabric->tf_ops.close_session = &tcm_loop_close_session; | |
1416 | fabric->tf_ops.stop_session = &tcm_loop_stop_session; | |
1417 | fabric->tf_ops.fall_back_to_erl0 = &tcm_loop_fall_back_to_erl0; | |
1418 | fabric->tf_ops.sess_logged_in = &tcm_loop_sess_logged_in; | |
1419 | fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index; | |
1420 | fabric->tf_ops.sess_get_initiator_sid = NULL; | |
1421 | fabric->tf_ops.write_pending = &tcm_loop_write_pending; | |
1422 | fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status; | |
1423 | /* | |
1424 | * Not used for TCM loopback | |
1425 | */ | |
1426 | fabric->tf_ops.set_default_node_attributes = | |
1427 | &tcm_loop_set_default_node_attributes; | |
1428 | fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag; | |
1429 | fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state; | |
3703b2c5 NB |
1430 | fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in; |
1431 | fabric->tf_ops.queue_status = &tcm_loop_queue_status; | |
1432 | fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp; | |
1433 | fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len; | |
1434 | fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len; | |
1435 | fabric->tf_ops.is_state_remove = &tcm_loop_is_state_remove; | |
3703b2c5 NB |
1436 | |
1437 | tf_cg = &fabric->tf_group; | |
1438 | /* | |
1439 | * Setup function pointers for generic logic in target_core_fabric_configfs.c | |
1440 | */ | |
1441 | fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba; | |
1442 | fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba; | |
1443 | fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg; | |
1444 | fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg; | |
1445 | /* | |
1446 | * fabric_post_link() and fabric_pre_unlink() are used for | |
1447 | * registration and release of TCM Loop Virtual SCSI LUNs. | |
1448 | */ | |
1449 | fabric->tf_ops.fabric_post_link = &tcm_loop_port_link; | |
1450 | fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink; | |
1451 | fabric->tf_ops.fabric_make_np = NULL; | |
1452 | fabric->tf_ops.fabric_drop_np = NULL; | |
1453 | /* | |
1454 | * Setup default attribute lists for various fabric->tf_cit_tmpl | |
1455 | */ | |
1456 | TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs; | |
1457 | TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs; | |
1458 | TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL; | |
1459 | TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL; | |
1460 | TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL; | |
1461 | /* | |
1462 | * Once fabric->tf_ops has been setup, now register the fabric for | |
1463 | * use within TCM | |
1464 | */ | |
1465 | ret = target_fabric_configfs_register(fabric); | |
1466 | if (ret < 0) { | |
6708bb27 | 1467 | pr_err("target_fabric_configfs_register() for" |
3703b2c5 NB |
1468 | " TCM_Loop failed!\n"); |
1469 | target_fabric_configfs_free(fabric); | |
1470 | return -1; | |
1471 | } | |
1472 | /* | |
1473 | * Setup our local pointer to *fabric. | |
1474 | */ | |
1475 | tcm_loop_fabric_configfs = fabric; | |
6708bb27 | 1476 | pr_debug("TCM_LOOP[0] - Set fabric ->" |
3703b2c5 NB |
1477 | " tcm_loop_fabric_configfs\n"); |
1478 | return 0; | |
1479 | } | |
1480 | ||
1481 | static void tcm_loop_deregister_configfs(void) | |
1482 | { | |
1483 | if (!tcm_loop_fabric_configfs) | |
1484 | return; | |
1485 | ||
1486 | target_fabric_configfs_deregister(tcm_loop_fabric_configfs); | |
1487 | tcm_loop_fabric_configfs = NULL; | |
6708bb27 | 1488 | pr_debug("TCM_LOOP[0] - Cleared" |
3703b2c5 NB |
1489 | " tcm_loop_fabric_configfs\n"); |
1490 | } | |
1491 | ||
1492 | static int __init tcm_loop_fabric_init(void) | |
1493 | { | |
1494 | int ret; | |
1495 | ||
1496 | tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", | |
1497 | sizeof(struct tcm_loop_cmd), | |
1498 | __alignof__(struct tcm_loop_cmd), | |
1499 | 0, NULL); | |
1500 | if (!tcm_loop_cmd_cache) { | |
6708bb27 | 1501 | pr_debug("kmem_cache_create() for" |
3703b2c5 NB |
1502 | " tcm_loop_cmd_cache failed\n"); |
1503 | return -ENOMEM; | |
1504 | } | |
1505 | ||
1506 | ret = tcm_loop_alloc_core_bus(); | |
1507 | if (ret) | |
1508 | return ret; | |
1509 | ||
1510 | ret = tcm_loop_register_configfs(); | |
1511 | if (ret) { | |
1512 | tcm_loop_release_core_bus(); | |
1513 | return ret; | |
1514 | } | |
1515 | ||
1516 | return 0; | |
1517 | } | |
1518 | ||
1519 | static void __exit tcm_loop_fabric_exit(void) | |
1520 | { | |
1521 | tcm_loop_deregister_configfs(); | |
1522 | tcm_loop_release_core_bus(); | |
1523 | kmem_cache_destroy(tcm_loop_cmd_cache); | |
1524 | } | |
1525 | ||
1526 | MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); | |
1527 | MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>"); | |
1528 | MODULE_LICENSE("GPL"); | |
1529 | module_init(tcm_loop_fabric_init); | |
1530 | module_exit(tcm_loop_fabric_exit); |