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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 | 150 | ret = transport_generic_allocate_tasks(se_cmd, sc->cmnd); |
03e98c9e NB |
151 | if (ret != 0) |
152 | return ret; | |
3703b2c5 | 153 | /* |
5951146d AG |
154 | * For BIDI commands, pass in the extra READ buffer |
155 | * to transport_generic_map_mem_to_cmd() below.. | |
3703b2c5 | 156 | */ |
a1d8b49a | 157 | if (se_cmd->t_tasks_bidi) { |
5951146d | 158 | struct scsi_data_buffer *sdb = scsi_in(sc); |
3703b2c5 | 159 | |
5951146d AG |
160 | sgl_bidi = sdb->table.sgl; |
161 | sgl_bidi_count = sdb->table.nents; | |
3703b2c5 | 162 | } |
8cd79f24 NB |
163 | /* |
164 | * Because some userspace code via scsi-generic do not memset their | |
165 | * associated read buffers, go ahead and do that here for type | |
166 | * SCF_SCSI_CONTROL_SG_IO_CDB. Also note that this is currently | |
167 | * guaranteed to be a single SGL for SCF_SCSI_CONTROL_SG_IO_CDB | |
168 | * by target core in transport_generic_allocate_tasks() -> | |
169 | * transport_generic_cmd_sequencer(). | |
170 | */ | |
171 | if (se_cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB && | |
172 | se_cmd->data_direction == DMA_FROM_DEVICE) { | |
173 | struct scatterlist *sg = scsi_sglist(sc); | |
174 | unsigned char *buf = kmap(sg_page(sg)) + sg->offset; | |
175 | ||
176 | if (buf != NULL) { | |
177 | memset(buf, 0, sg->length); | |
178 | kunmap(sg_page(sg)); | |
179 | } | |
180 | } | |
5951146d | 181 | |
ec98f782 | 182 | /* Tell the core about our preallocated memory */ |
03e98c9e | 183 | return transport_generic_map_mem_to_cmd(se_cmd, scsi_sglist(sc), |
5951146d | 184 | scsi_sg_count(sc), sgl_bidi, sgl_bidi_count); |
3703b2c5 NB |
185 | } |
186 | ||
187 | /* | |
188 | * Called from struct target_core_fabric_ops->check_stop_free() | |
189 | */ | |
88dd9e26 | 190 | static int tcm_loop_check_stop_free(struct se_cmd *se_cmd) |
3703b2c5 NB |
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) | |
88dd9e26 | 198 | return 0; |
3703b2c5 NB |
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); |
88dd9e26 | 204 | return 1; |
3703b2c5 NB |
205 | } |
206 | ||
35462975 | 207 | static void tcm_loop_release_cmd(struct se_cmd *se_cmd) |
3703b2c5 NB |
208 | { |
209 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
210 | struct tcm_loop_cmd, tl_se_cmd); | |
211 | ||
212 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); | |
213 | } | |
214 | ||
215 | static int tcm_loop_proc_info(struct Scsi_Host *host, char *buffer, | |
216 | char **start, off_t offset, | |
217 | int length, int inout) | |
218 | { | |
219 | return sprintf(buffer, "tcm_loop_proc_info()\n"); | |
220 | } | |
221 | ||
222 | static int tcm_loop_driver_probe(struct device *); | |
223 | static int tcm_loop_driver_remove(struct device *); | |
224 | ||
225 | static int pseudo_lld_bus_match(struct device *dev, | |
226 | struct device_driver *dev_driver) | |
227 | { | |
228 | return 1; | |
229 | } | |
230 | ||
231 | static struct bus_type tcm_loop_lld_bus = { | |
232 | .name = "tcm_loop_bus", | |
233 | .match = pseudo_lld_bus_match, | |
234 | .probe = tcm_loop_driver_probe, | |
235 | .remove = tcm_loop_driver_remove, | |
236 | }; | |
237 | ||
238 | static struct device_driver tcm_loop_driverfs = { | |
239 | .name = "tcm_loop", | |
240 | .bus = &tcm_loop_lld_bus, | |
241 | }; | |
242 | /* | |
243 | * Used with root_device_register() in tcm_loop_alloc_core_bus() below | |
244 | */ | |
245 | struct device *tcm_loop_primary; | |
246 | ||
247 | /* | |
248 | * Copied from drivers/scsi/libfc/fc_fcp.c:fc_change_queue_depth() and | |
249 | * drivers/scsi/libiscsi.c:iscsi_change_queue_depth() | |
250 | */ | |
251 | static int tcm_loop_change_queue_depth( | |
252 | struct scsi_device *sdev, | |
253 | int depth, | |
254 | int reason) | |
255 | { | |
256 | switch (reason) { | |
257 | case SCSI_QDEPTH_DEFAULT: | |
258 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
259 | break; | |
260 | case SCSI_QDEPTH_QFULL: | |
261 | scsi_track_queue_full(sdev, depth); | |
262 | break; | |
263 | case SCSI_QDEPTH_RAMP_UP: | |
264 | scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); | |
265 | break; | |
266 | default: | |
267 | return -EOPNOTSUPP; | |
268 | } | |
269 | return sdev->queue_depth; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Main entry point from struct scsi_host_template for incoming SCSI CDB+Data | |
274 | * from Linux/SCSI subsystem for SCSI low level device drivers (LLDs) | |
275 | */ | |
276 | static int tcm_loop_queuecommand( | |
277 | struct Scsi_Host *sh, | |
278 | struct scsi_cmnd *sc) | |
279 | { | |
280 | struct se_cmd *se_cmd; | |
281 | struct se_portal_group *se_tpg; | |
282 | struct tcm_loop_hba *tl_hba; | |
283 | struct tcm_loop_tpg *tl_tpg; | |
284 | ||
6708bb27 | 285 | pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x" |
3703b2c5 NB |
286 | " scsi_buf_len: %u\n", sc->device->host->host_no, |
287 | sc->device->id, sc->device->channel, sc->device->lun, | |
288 | sc->cmnd[0], scsi_bufflen(sc)); | |
289 | /* | |
290 | * Locate the tcm_loop_hba_t pointer | |
291 | */ | |
292 | tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); | |
293 | tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; | |
0a020436 NB |
294 | /* |
295 | * Ensure that this tl_tpg reference from the incoming sc->device->id | |
296 | * has already been configured via tcm_loop_make_naa_tpg(). | |
297 | */ | |
298 | if (!tl_tpg->tl_hba) { | |
299 | set_host_byte(sc, DID_NO_CONNECT); | |
300 | sc->scsi_done(sc); | |
301 | return 0; | |
302 | } | |
3703b2c5 NB |
303 | se_tpg = &tl_tpg->tl_se_tpg; |
304 | /* | |
305 | * Determine the SAM Task Attribute and allocate tl_cmd and | |
306 | * tl_cmd->tl_se_cmd from TCM infrastructure | |
307 | */ | |
308 | se_cmd = tcm_loop_allocate_core_cmd(tl_hba, se_tpg, sc); | |
309 | if (!se_cmd) { | |
310 | sc->scsi_done(sc); | |
311 | return 0; | |
312 | } | |
313 | /* | |
314 | * Queue up the newly allocated to be processed in TCM thread context. | |
315 | */ | |
316 | transport_generic_handle_cdb_map(se_cmd); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | /* | |
321 | * Called from SCSI EH process context to issue a LUN_RESET TMR | |
322 | * to struct scsi_device | |
323 | */ | |
324 | static int tcm_loop_device_reset(struct scsi_cmnd *sc) | |
325 | { | |
326 | struct se_cmd *se_cmd = NULL; | |
327 | struct se_portal_group *se_tpg; | |
328 | struct se_session *se_sess; | |
329 | struct tcm_loop_cmd *tl_cmd = NULL; | |
330 | struct tcm_loop_hba *tl_hba; | |
331 | struct tcm_loop_nexus *tl_nexus; | |
332 | struct tcm_loop_tmr *tl_tmr = NULL; | |
333 | struct tcm_loop_tpg *tl_tpg; | |
334 | int ret = FAILED; | |
335 | /* | |
336 | * Locate the tcm_loop_hba_t pointer | |
337 | */ | |
338 | tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); | |
339 | /* | |
340 | * Locate the tl_nexus and se_sess pointers | |
341 | */ | |
342 | tl_nexus = tl_hba->tl_nexus; | |
343 | if (!tl_nexus) { | |
6708bb27 | 344 | pr_err("Unable to perform device reset without" |
3703b2c5 NB |
345 | " active I_T Nexus\n"); |
346 | return FAILED; | |
347 | } | |
348 | se_sess = tl_nexus->se_sess; | |
349 | /* | |
350 | * Locate the tl_tpg and se_tpg pointers from TargetID in sc->device->id | |
351 | */ | |
352 | tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; | |
353 | se_tpg = &tl_tpg->tl_se_tpg; | |
354 | ||
355 | tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); | |
356 | if (!tl_cmd) { | |
6708bb27 | 357 | pr_err("Unable to allocate memory for tl_cmd\n"); |
3703b2c5 NB |
358 | return FAILED; |
359 | } | |
360 | ||
361 | tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL); | |
362 | if (!tl_tmr) { | |
6708bb27 | 363 | pr_err("Unable to allocate memory for tl_tmr\n"); |
3703b2c5 NB |
364 | goto release; |
365 | } | |
366 | init_waitqueue_head(&tl_tmr->tl_tmr_wait); | |
367 | ||
368 | se_cmd = &tl_cmd->tl_se_cmd; | |
369 | /* | |
370 | * Initialize struct se_cmd descriptor from target_core_mod infrastructure | |
371 | */ | |
372 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0, | |
61db1802 | 373 | DMA_NONE, MSG_SIMPLE_TAG, |
3703b2c5 NB |
374 | &tl_cmd->tl_sense_buf[0]); |
375 | /* | |
376 | * Allocate the LUN_RESET TMR | |
377 | */ | |
5951146d | 378 | se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd, tl_tmr, |
dd503a5f | 379 | TMR_LUN_RESET, GFP_KERNEL); |
552523dc | 380 | if (IS_ERR(se_cmd->se_tmr_req)) |
3703b2c5 NB |
381 | goto release; |
382 | /* | |
383 | * Locate the underlying TCM struct se_lun from sc->device->lun | |
384 | */ | |
5951146d | 385 | if (transport_lookup_tmr_lun(se_cmd, sc->device->lun) < 0) |
3703b2c5 NB |
386 | goto release; |
387 | /* | |
388 | * Queue the TMR to TCM Core and sleep waiting for tcm_loop_queue_tm_rsp() | |
389 | * to wake us up. | |
390 | */ | |
391 | transport_generic_handle_tmr(se_cmd); | |
392 | wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete)); | |
393 | /* | |
394 | * The TMR LUN_RESET has completed, check the response status and | |
395 | * then release allocations. | |
396 | */ | |
397 | ret = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? | |
398 | SUCCESS : FAILED; | |
399 | release: | |
400 | if (se_cmd) | |
82f1c8a4 | 401 | transport_generic_free_cmd(se_cmd, 1); |
3703b2c5 NB |
402 | else |
403 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); | |
404 | kfree(tl_tmr); | |
405 | return ret; | |
406 | } | |
407 | ||
408 | static int tcm_loop_slave_alloc(struct scsi_device *sd) | |
409 | { | |
410 | set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags); | |
411 | return 0; | |
412 | } | |
413 | ||
414 | static int tcm_loop_slave_configure(struct scsi_device *sd) | |
415 | { | |
416 | return 0; | |
417 | } | |
418 | ||
419 | static struct scsi_host_template tcm_loop_driver_template = { | |
420 | .proc_info = tcm_loop_proc_info, | |
421 | .proc_name = "tcm_loopback", | |
422 | .name = "TCM_Loopback", | |
423 | .queuecommand = tcm_loop_queuecommand, | |
424 | .change_queue_depth = tcm_loop_change_queue_depth, | |
425 | .eh_device_reset_handler = tcm_loop_device_reset, | |
426 | .can_queue = TL_SCSI_CAN_QUEUE, | |
427 | .this_id = -1, | |
428 | .sg_tablesize = TL_SCSI_SG_TABLESIZE, | |
429 | .cmd_per_lun = TL_SCSI_CMD_PER_LUN, | |
430 | .max_sectors = TL_SCSI_MAX_SECTORS, | |
431 | .use_clustering = DISABLE_CLUSTERING, | |
432 | .slave_alloc = tcm_loop_slave_alloc, | |
433 | .slave_configure = tcm_loop_slave_configure, | |
434 | .module = THIS_MODULE, | |
435 | }; | |
436 | ||
437 | static int tcm_loop_driver_probe(struct device *dev) | |
438 | { | |
439 | struct tcm_loop_hba *tl_hba; | |
440 | struct Scsi_Host *sh; | |
441 | int error; | |
442 | ||
443 | tl_hba = to_tcm_loop_hba(dev); | |
444 | ||
445 | sh = scsi_host_alloc(&tcm_loop_driver_template, | |
446 | sizeof(struct tcm_loop_hba)); | |
447 | if (!sh) { | |
6708bb27 | 448 | pr_err("Unable to allocate struct scsi_host\n"); |
3703b2c5 NB |
449 | return -ENODEV; |
450 | } | |
451 | tl_hba->sh = sh; | |
452 | ||
453 | /* | |
454 | * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata | |
455 | */ | |
456 | *((struct tcm_loop_hba **)sh->hostdata) = tl_hba; | |
457 | /* | |
458 | * Setup single ID, Channel and LUN for now.. | |
459 | */ | |
460 | sh->max_id = 2; | |
461 | sh->max_lun = 0; | |
462 | sh->max_channel = 0; | |
463 | sh->max_cmd_len = TL_SCSI_MAX_CMD_LEN; | |
464 | ||
465 | error = scsi_add_host(sh, &tl_hba->dev); | |
466 | if (error) { | |
6708bb27 | 467 | pr_err("%s: scsi_add_host failed\n", __func__); |
3703b2c5 NB |
468 | scsi_host_put(sh); |
469 | return -ENODEV; | |
470 | } | |
471 | return 0; | |
472 | } | |
473 | ||
474 | static int tcm_loop_driver_remove(struct device *dev) | |
475 | { | |
476 | struct tcm_loop_hba *tl_hba; | |
477 | struct Scsi_Host *sh; | |
478 | ||
479 | tl_hba = to_tcm_loop_hba(dev); | |
480 | sh = tl_hba->sh; | |
481 | ||
482 | scsi_remove_host(sh); | |
483 | scsi_host_put(sh); | |
484 | return 0; | |
485 | } | |
486 | ||
487 | static void tcm_loop_release_adapter(struct device *dev) | |
488 | { | |
489 | struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev); | |
490 | ||
491 | kfree(tl_hba); | |
492 | } | |
493 | ||
494 | /* | |
495 | * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c | |
496 | */ | |
497 | static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id) | |
498 | { | |
499 | int ret; | |
500 | ||
501 | tl_hba->dev.bus = &tcm_loop_lld_bus; | |
502 | tl_hba->dev.parent = tcm_loop_primary; | |
503 | tl_hba->dev.release = &tcm_loop_release_adapter; | |
504 | dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id); | |
505 | ||
506 | ret = device_register(&tl_hba->dev); | |
507 | if (ret) { | |
6708bb27 | 508 | pr_err("device_register() failed for" |
3703b2c5 NB |
509 | " tl_hba->dev: %d\n", ret); |
510 | return -ENODEV; | |
511 | } | |
512 | ||
513 | return 0; | |
514 | } | |
515 | ||
516 | /* | |
517 | * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated | |
518 | * tcm_loop SCSI bus. | |
519 | */ | |
520 | static int tcm_loop_alloc_core_bus(void) | |
521 | { | |
522 | int ret; | |
523 | ||
524 | tcm_loop_primary = root_device_register("tcm_loop_0"); | |
525 | if (IS_ERR(tcm_loop_primary)) { | |
6708bb27 | 526 | pr_err("Unable to allocate tcm_loop_primary\n"); |
3703b2c5 NB |
527 | return PTR_ERR(tcm_loop_primary); |
528 | } | |
529 | ||
530 | ret = bus_register(&tcm_loop_lld_bus); | |
531 | if (ret) { | |
6708bb27 | 532 | pr_err("bus_register() failed for tcm_loop_lld_bus\n"); |
3703b2c5 NB |
533 | goto dev_unreg; |
534 | } | |
535 | ||
536 | ret = driver_register(&tcm_loop_driverfs); | |
537 | if (ret) { | |
6708bb27 | 538 | pr_err("driver_register() failed for" |
3703b2c5 NB |
539 | "tcm_loop_driverfs\n"); |
540 | goto bus_unreg; | |
541 | } | |
542 | ||
6708bb27 | 543 | pr_debug("Initialized TCM Loop Core Bus\n"); |
3703b2c5 NB |
544 | return ret; |
545 | ||
546 | bus_unreg: | |
547 | bus_unregister(&tcm_loop_lld_bus); | |
548 | dev_unreg: | |
549 | root_device_unregister(tcm_loop_primary); | |
550 | return ret; | |
551 | } | |
552 | ||
553 | static void tcm_loop_release_core_bus(void) | |
554 | { | |
555 | driver_unregister(&tcm_loop_driverfs); | |
556 | bus_unregister(&tcm_loop_lld_bus); | |
557 | root_device_unregister(tcm_loop_primary); | |
558 | ||
6708bb27 | 559 | pr_debug("Releasing TCM Loop Core BUS\n"); |
3703b2c5 NB |
560 | } |
561 | ||
562 | static char *tcm_loop_get_fabric_name(void) | |
563 | { | |
564 | return "loopback"; | |
565 | } | |
566 | ||
567 | static u8 tcm_loop_get_fabric_proto_ident(struct se_portal_group *se_tpg) | |
568 | { | |
569 | struct tcm_loop_tpg *tl_tpg = | |
570 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
571 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
572 | /* | |
573 | * tl_proto_id is set at tcm_loop_configfs.c:tcm_loop_make_scsi_hba() | |
574 | * time based on the protocol dependent prefix of the passed configfs group. | |
575 | * | |
576 | * Based upon tl_proto_id, TCM_Loop emulates the requested fabric | |
577 | * ProtocolID using target_core_fabric_lib.c symbols. | |
578 | */ | |
579 | switch (tl_hba->tl_proto_id) { | |
580 | case SCSI_PROTOCOL_SAS: | |
581 | return sas_get_fabric_proto_ident(se_tpg); | |
582 | case SCSI_PROTOCOL_FCP: | |
583 | return fc_get_fabric_proto_ident(se_tpg); | |
584 | case SCSI_PROTOCOL_ISCSI: | |
585 | return iscsi_get_fabric_proto_ident(se_tpg); | |
586 | default: | |
6708bb27 | 587 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
588 | " SAS emulation\n", tl_hba->tl_proto_id); |
589 | break; | |
590 | } | |
591 | ||
592 | return sas_get_fabric_proto_ident(se_tpg); | |
593 | } | |
594 | ||
595 | static char *tcm_loop_get_endpoint_wwn(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 | * Return the passed NAA identifier for the SAS Target Port | |
601 | */ | |
602 | return &tl_tpg->tl_hba->tl_wwn_address[0]; | |
603 | } | |
604 | ||
605 | static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg) | |
606 | { | |
607 | struct tcm_loop_tpg *tl_tpg = | |
608 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
609 | /* | |
610 | * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 | |
611 | * to represent the SCSI Target Port. | |
612 | */ | |
613 | return tl_tpg->tl_tpgt; | |
614 | } | |
615 | ||
616 | static u32 tcm_loop_get_default_depth(struct se_portal_group *se_tpg) | |
617 | { | |
618 | return 1; | |
619 | } | |
620 | ||
621 | static u32 tcm_loop_get_pr_transport_id( | |
622 | struct se_portal_group *se_tpg, | |
623 | struct se_node_acl *se_nacl, | |
624 | struct t10_pr_registration *pr_reg, | |
625 | int *format_code, | |
626 | unsigned char *buf) | |
627 | { | |
628 | struct tcm_loop_tpg *tl_tpg = | |
629 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
630 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
631 | ||
632 | switch (tl_hba->tl_proto_id) { | |
633 | case SCSI_PROTOCOL_SAS: | |
634 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
635 | format_code, buf); | |
636 | case SCSI_PROTOCOL_FCP: | |
637 | return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
638 | format_code, buf); | |
639 | case SCSI_PROTOCOL_ISCSI: | |
640 | return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
641 | format_code, buf); | |
642 | default: | |
6708bb27 | 643 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
644 | " SAS emulation\n", tl_hba->tl_proto_id); |
645 | break; | |
646 | } | |
647 | ||
648 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
649 | format_code, buf); | |
650 | } | |
651 | ||
652 | static u32 tcm_loop_get_pr_transport_id_len( | |
653 | struct se_portal_group *se_tpg, | |
654 | struct se_node_acl *se_nacl, | |
655 | struct t10_pr_registration *pr_reg, | |
656 | int *format_code) | |
657 | { | |
658 | struct tcm_loop_tpg *tl_tpg = | |
659 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
660 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
661 | ||
662 | switch (tl_hba->tl_proto_id) { | |
663 | case SCSI_PROTOCOL_SAS: | |
664 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
665 | format_code); | |
666 | case SCSI_PROTOCOL_FCP: | |
667 | return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
668 | format_code); | |
669 | case SCSI_PROTOCOL_ISCSI: | |
670 | return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
671 | format_code); | |
672 | default: | |
6708bb27 | 673 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
674 | " SAS emulation\n", tl_hba->tl_proto_id); |
675 | break; | |
676 | } | |
677 | ||
678 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
679 | format_code); | |
680 | } | |
681 | ||
682 | /* | |
683 | * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above | |
684 | * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. | |
685 | */ | |
686 | static char *tcm_loop_parse_pr_out_transport_id( | |
687 | struct se_portal_group *se_tpg, | |
688 | const char *buf, | |
689 | u32 *out_tid_len, | |
690 | char **port_nexus_ptr) | |
691 | { | |
692 | struct tcm_loop_tpg *tl_tpg = | |
693 | (struct tcm_loop_tpg *)se_tpg->se_tpg_fabric_ptr; | |
694 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
695 | ||
696 | switch (tl_hba->tl_proto_id) { | |
697 | case SCSI_PROTOCOL_SAS: | |
698 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
699 | port_nexus_ptr); | |
700 | case SCSI_PROTOCOL_FCP: | |
701 | return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
702 | port_nexus_ptr); | |
703 | case SCSI_PROTOCOL_ISCSI: | |
704 | return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
705 | port_nexus_ptr); | |
706 | default: | |
6708bb27 | 707 | pr_err("Unknown tl_proto_id: 0x%02x, using" |
3703b2c5 NB |
708 | " SAS emulation\n", tl_hba->tl_proto_id); |
709 | break; | |
710 | } | |
711 | ||
712 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
713 | port_nexus_ptr); | |
714 | } | |
715 | ||
716 | /* | |
717 | * Returning (1) here allows for target_core_mod struct se_node_acl to be generated | |
718 | * based upon the incoming fabric dependent SCSI Initiator Port | |
719 | */ | |
720 | static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) | |
721 | { | |
722 | return 1; | |
723 | } | |
724 | ||
725 | static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) | |
726 | { | |
727 | return 0; | |
728 | } | |
729 | ||
730 | /* | |
731 | * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for | |
732 | * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest | |
733 | */ | |
734 | static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) | |
735 | { | |
736 | return 0; | |
737 | } | |
738 | ||
739 | /* | |
740 | * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will | |
741 | * never be called for TCM_Loop by target_core_fabric_configfs.c code. | |
742 | * It has been added here as a nop for target_fabric_tf_ops_check() | |
743 | */ | |
744 | static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) | |
745 | { | |
746 | return 0; | |
747 | } | |
748 | ||
749 | static struct se_node_acl *tcm_loop_tpg_alloc_fabric_acl( | |
750 | struct se_portal_group *se_tpg) | |
751 | { | |
752 | struct tcm_loop_nacl *tl_nacl; | |
753 | ||
754 | tl_nacl = kzalloc(sizeof(struct tcm_loop_nacl), GFP_KERNEL); | |
755 | if (!tl_nacl) { | |
6708bb27 | 756 | pr_err("Unable to allocate struct tcm_loop_nacl\n"); |
3703b2c5 NB |
757 | return NULL; |
758 | } | |
759 | ||
760 | return &tl_nacl->se_node_acl; | |
761 | } | |
762 | ||
763 | static void tcm_loop_tpg_release_fabric_acl( | |
764 | struct se_portal_group *se_tpg, | |
765 | struct se_node_acl *se_nacl) | |
766 | { | |
767 | struct tcm_loop_nacl *tl_nacl = container_of(se_nacl, | |
768 | struct tcm_loop_nacl, se_node_acl); | |
769 | ||
770 | kfree(tl_nacl); | |
771 | } | |
772 | ||
773 | static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) | |
774 | { | |
775 | return 1; | |
776 | } | |
777 | ||
3703b2c5 NB |
778 | static int tcm_loop_is_state_remove(struct se_cmd *se_cmd) |
779 | { | |
780 | /* | |
781 | * Assume struct scsi_cmnd is not in remove state.. | |
782 | */ | |
783 | return 0; | |
784 | } | |
785 | ||
786 | static int tcm_loop_sess_logged_in(struct se_session *se_sess) | |
787 | { | |
788 | /* | |
789 | * Assume that TL Nexus is always active | |
790 | */ | |
791 | return 1; | |
792 | } | |
793 | ||
794 | static u32 tcm_loop_sess_get_index(struct se_session *se_sess) | |
795 | { | |
796 | return 1; | |
797 | } | |
798 | ||
799 | static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) | |
800 | { | |
801 | return; | |
802 | } | |
803 | ||
804 | static u32 tcm_loop_get_task_tag(struct se_cmd *se_cmd) | |
805 | { | |
806 | return 1; | |
807 | } | |
808 | ||
809 | static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) | |
810 | { | |
811 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
812 | struct tcm_loop_cmd, tl_se_cmd); | |
813 | ||
814 | return tl_cmd->sc_cmd_state; | |
815 | } | |
816 | ||
817 | static int tcm_loop_shutdown_session(struct se_session *se_sess) | |
818 | { | |
819 | return 0; | |
820 | } | |
821 | ||
822 | static void tcm_loop_close_session(struct se_session *se_sess) | |
823 | { | |
824 | return; | |
825 | }; | |
826 | ||
827 | static void tcm_loop_stop_session( | |
828 | struct se_session *se_sess, | |
829 | int sess_sleep, | |
830 | int conn_sleep) | |
831 | { | |
832 | return; | |
833 | } | |
834 | ||
835 | static void tcm_loop_fall_back_to_erl0(struct se_session *se_sess) | |
836 | { | |
837 | return; | |
838 | } | |
839 | ||
840 | static int tcm_loop_write_pending(struct se_cmd *se_cmd) | |
841 | { | |
842 | /* | |
843 | * Since Linux/SCSI has already sent down a struct scsi_cmnd | |
844 | * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array | |
845 | * memory, and memory has already been mapped to struct se_cmd->t_mem_list | |
846 | * format with transport_generic_map_mem_to_cmd(). | |
847 | * | |
848 | * We now tell TCM to add this WRITE CDB directly into the TCM storage | |
849 | * object execution queue. | |
850 | */ | |
851 | transport_generic_process_write(se_cmd); | |
852 | return 0; | |
853 | } | |
854 | ||
855 | static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) | |
856 | { | |
857 | return 0; | |
858 | } | |
859 | ||
860 | static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) | |
861 | { | |
862 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
863 | struct tcm_loop_cmd, tl_se_cmd); | |
864 | struct scsi_cmnd *sc = tl_cmd->sc; | |
865 | ||
6708bb27 | 866 | pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" |
3703b2c5 NB |
867 | " cdb: 0x%02x\n", sc, sc->cmnd[0]); |
868 | ||
869 | sc->result = SAM_STAT_GOOD; | |
870 | set_host_byte(sc, DID_OK); | |
871 | sc->scsi_done(sc); | |
872 | return 0; | |
873 | } | |
874 | ||
875 | static int tcm_loop_queue_status(struct se_cmd *se_cmd) | |
876 | { | |
877 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
878 | struct tcm_loop_cmd, tl_se_cmd); | |
879 | struct scsi_cmnd *sc = tl_cmd->sc; | |
880 | ||
6708bb27 | 881 | pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" |
3703b2c5 NB |
882 | " cdb: 0x%02x\n", sc, sc->cmnd[0]); |
883 | ||
884 | if (se_cmd->sense_buffer && | |
885 | ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || | |
886 | (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { | |
887 | ||
5951146d | 888 | memcpy(sc->sense_buffer, se_cmd->sense_buffer, |
3703b2c5 NB |
889 | SCSI_SENSE_BUFFERSIZE); |
890 | sc->result = SAM_STAT_CHECK_CONDITION; | |
891 | set_driver_byte(sc, DRIVER_SENSE); | |
892 | } else | |
893 | sc->result = se_cmd->scsi_status; | |
894 | ||
895 | set_host_byte(sc, DID_OK); | |
896 | sc->scsi_done(sc); | |
897 | return 0; | |
898 | } | |
899 | ||
900 | static int tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) | |
901 | { | |
902 | struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; | |
903 | struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; | |
904 | /* | |
905 | * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead | |
906 | * and wake up the wait_queue_head_t in tcm_loop_device_reset() | |
907 | */ | |
908 | atomic_set(&tl_tmr->tmr_complete, 1); | |
909 | wake_up(&tl_tmr->tl_tmr_wait); | |
910 | return 0; | |
911 | } | |
912 | ||
913 | static u16 tcm_loop_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length) | |
914 | { | |
915 | return 0; | |
916 | } | |
917 | ||
918 | static u16 tcm_loop_get_fabric_sense_len(void) | |
919 | { | |
920 | return 0; | |
921 | } | |
922 | ||
3703b2c5 NB |
923 | static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) |
924 | { | |
925 | switch (tl_hba->tl_proto_id) { | |
926 | case SCSI_PROTOCOL_SAS: | |
927 | return "SAS"; | |
928 | case SCSI_PROTOCOL_FCP: | |
929 | return "FCP"; | |
930 | case SCSI_PROTOCOL_ISCSI: | |
931 | return "iSCSI"; | |
932 | default: | |
933 | break; | |
934 | } | |
935 | ||
936 | return "Unknown"; | |
937 | } | |
938 | ||
939 | /* Start items for tcm_loop_port_cit */ | |
940 | ||
941 | static int tcm_loop_port_link( | |
942 | struct se_portal_group *se_tpg, | |
943 | struct se_lun *lun) | |
944 | { | |
945 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
946 | struct tcm_loop_tpg, tl_se_tpg); | |
947 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
948 | ||
949 | atomic_inc(&tl_tpg->tl_tpg_port_count); | |
950 | smp_mb__after_atomic_inc(); | |
951 | /* | |
952 | * Add Linux/SCSI struct scsi_device by HCTL | |
953 | */ | |
954 | scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); | |
955 | ||
6708bb27 | 956 | pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); |
3703b2c5 NB |
957 | return 0; |
958 | } | |
959 | ||
960 | static void tcm_loop_port_unlink( | |
961 | struct se_portal_group *se_tpg, | |
962 | struct se_lun *se_lun) | |
963 | { | |
964 | struct scsi_device *sd; | |
965 | struct tcm_loop_hba *tl_hba; | |
966 | struct tcm_loop_tpg *tl_tpg; | |
967 | ||
968 | tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); | |
969 | tl_hba = tl_tpg->tl_hba; | |
970 | ||
971 | sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, | |
972 | se_lun->unpacked_lun); | |
973 | if (!sd) { | |
6708bb27 | 974 | pr_err("Unable to locate struct scsi_device for %d:%d:" |
3703b2c5 NB |
975 | "%d\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); |
976 | return; | |
977 | } | |
978 | /* | |
979 | * Remove Linux/SCSI struct scsi_device by HCTL | |
980 | */ | |
981 | scsi_remove_device(sd); | |
982 | scsi_device_put(sd); | |
983 | ||
984 | atomic_dec(&tl_tpg->tl_tpg_port_count); | |
985 | smp_mb__after_atomic_dec(); | |
986 | ||
6708bb27 | 987 | pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); |
3703b2c5 NB |
988 | } |
989 | ||
990 | /* End items for tcm_loop_port_cit */ | |
991 | ||
992 | /* Start items for tcm_loop_nexus_cit */ | |
993 | ||
994 | static int tcm_loop_make_nexus( | |
995 | struct tcm_loop_tpg *tl_tpg, | |
996 | const char *name) | |
997 | { | |
998 | struct se_portal_group *se_tpg; | |
999 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
1000 | struct tcm_loop_nexus *tl_nexus; | |
552523dc | 1001 | int ret = -ENOMEM; |
3703b2c5 NB |
1002 | |
1003 | if (tl_tpg->tl_hba->tl_nexus) { | |
6708bb27 | 1004 | pr_debug("tl_tpg->tl_hba->tl_nexus already exists\n"); |
3703b2c5 NB |
1005 | return -EEXIST; |
1006 | } | |
1007 | se_tpg = &tl_tpg->tl_se_tpg; | |
1008 | ||
1009 | tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); | |
1010 | if (!tl_nexus) { | |
6708bb27 | 1011 | pr_err("Unable to allocate struct tcm_loop_nexus\n"); |
3703b2c5 NB |
1012 | return -ENOMEM; |
1013 | } | |
1014 | /* | |
1015 | * Initialize the struct se_session pointer | |
1016 | */ | |
1017 | tl_nexus->se_sess = transport_init_session(); | |
552523dc DC |
1018 | if (IS_ERR(tl_nexus->se_sess)) { |
1019 | ret = PTR_ERR(tl_nexus->se_sess); | |
3703b2c5 | 1020 | goto out; |
552523dc | 1021 | } |
3703b2c5 NB |
1022 | /* |
1023 | * Since we are running in 'demo mode' this call with generate a | |
1024 | * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI | |
1025 | * Initiator port name of the passed configfs group 'name'. | |
1026 | */ | |
1027 | tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1028 | se_tpg, (unsigned char *)name); | |
1029 | if (!tl_nexus->se_sess->se_node_acl) { | |
1030 | transport_free_session(tl_nexus->se_sess); | |
1031 | goto out; | |
1032 | } | |
1033 | /* | |
1034 | * Now, register the SAS I_T Nexus as active with the call to | |
1035 | * transport_register_session() | |
1036 | */ | |
1037 | __transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, | |
5951146d | 1038 | tl_nexus->se_sess, tl_nexus); |
3703b2c5 | 1039 | tl_tpg->tl_hba->tl_nexus = tl_nexus; |
6708bb27 | 1040 | pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" |
3703b2c5 NB |
1041 | " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), |
1042 | name); | |
1043 | return 0; | |
1044 | ||
1045 | out: | |
1046 | kfree(tl_nexus); | |
552523dc | 1047 | return ret; |
3703b2c5 NB |
1048 | } |
1049 | ||
1050 | static int tcm_loop_drop_nexus( | |
1051 | struct tcm_loop_tpg *tpg) | |
1052 | { | |
1053 | struct se_session *se_sess; | |
1054 | struct tcm_loop_nexus *tl_nexus; | |
1055 | struct tcm_loop_hba *tl_hba = tpg->tl_hba; | |
1056 | ||
1057 | tl_nexus = tpg->tl_hba->tl_nexus; | |
1058 | if (!tl_nexus) | |
1059 | return -ENODEV; | |
1060 | ||
1061 | se_sess = tl_nexus->se_sess; | |
1062 | if (!se_sess) | |
1063 | return -ENODEV; | |
1064 | ||
1065 | if (atomic_read(&tpg->tl_tpg_port_count)) { | |
6708bb27 | 1066 | pr_err("Unable to remove TCM_Loop I_T Nexus with" |
3703b2c5 NB |
1067 | " active TPG port count: %d\n", |
1068 | atomic_read(&tpg->tl_tpg_port_count)); | |
1069 | return -EPERM; | |
1070 | } | |
1071 | ||
6708bb27 | 1072 | pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" |
3703b2c5 NB |
1073 | " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), |
1074 | tl_nexus->se_sess->se_node_acl->initiatorname); | |
1075 | /* | |
1076 | * Release the SCSI I_T Nexus to the emulated SAS Target Port | |
1077 | */ | |
1078 | transport_deregister_session(tl_nexus->se_sess); | |
1079 | tpg->tl_hba->tl_nexus = NULL; | |
1080 | kfree(tl_nexus); | |
1081 | return 0; | |
1082 | } | |
1083 | ||
1084 | /* End items for tcm_loop_nexus_cit */ | |
1085 | ||
1086 | static ssize_t tcm_loop_tpg_show_nexus( | |
1087 | struct se_portal_group *se_tpg, | |
1088 | char *page) | |
1089 | { | |
1090 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1091 | struct tcm_loop_tpg, tl_se_tpg); | |
1092 | struct tcm_loop_nexus *tl_nexus; | |
1093 | ssize_t ret; | |
1094 | ||
1095 | tl_nexus = tl_tpg->tl_hba->tl_nexus; | |
1096 | if (!tl_nexus) | |
1097 | return -ENODEV; | |
1098 | ||
1099 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1100 | tl_nexus->se_sess->se_node_acl->initiatorname); | |
1101 | ||
1102 | return ret; | |
1103 | } | |
1104 | ||
1105 | static ssize_t tcm_loop_tpg_store_nexus( | |
1106 | struct se_portal_group *se_tpg, | |
1107 | const char *page, | |
1108 | size_t count) | |
1109 | { | |
1110 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1111 | struct tcm_loop_tpg, tl_se_tpg); | |
1112 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
1113 | unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; | |
1114 | int ret; | |
1115 | /* | |
1116 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
1117 | */ | |
1118 | if (!strncmp(page, "NULL", 4)) { | |
1119 | ret = tcm_loop_drop_nexus(tl_tpg); | |
1120 | return (!ret) ? count : ret; | |
1121 | } | |
1122 | /* | |
1123 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1124 | * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call | |
1125 | * tcm_loop_make_nexus() | |
1126 | */ | |
60d645a4 | 1127 | if (strlen(page) >= TL_WWN_ADDR_LEN) { |
6708bb27 | 1128 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
3703b2c5 NB |
1129 | " max: %d\n", page, TL_WWN_ADDR_LEN); |
1130 | return -EINVAL; | |
1131 | } | |
1132 | snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); | |
1133 | ||
1134 | ptr = strstr(i_port, "naa."); | |
1135 | if (ptr) { | |
1136 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { | |
6708bb27 | 1137 | pr_err("Passed SAS Initiator Port %s does not" |
3703b2c5 NB |
1138 | " match target port protoid: %s\n", i_port, |
1139 | tcm_loop_dump_proto_id(tl_hba)); | |
1140 | return -EINVAL; | |
1141 | } | |
1142 | port_ptr = &i_port[0]; | |
1143 | goto check_newline; | |
1144 | } | |
1145 | ptr = strstr(i_port, "fc."); | |
1146 | if (ptr) { | |
1147 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { | |
6708bb27 | 1148 | pr_err("Passed FCP Initiator Port %s does not" |
3703b2c5 NB |
1149 | " match target port protoid: %s\n", i_port, |
1150 | tcm_loop_dump_proto_id(tl_hba)); | |
1151 | return -EINVAL; | |
1152 | } | |
1153 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1154 | goto check_newline; | |
1155 | } | |
1156 | ptr = strstr(i_port, "iqn."); | |
1157 | if (ptr) { | |
1158 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { | |
6708bb27 | 1159 | pr_err("Passed iSCSI Initiator Port %s does not" |
3703b2c5 NB |
1160 | " match target port protoid: %s\n", i_port, |
1161 | tcm_loop_dump_proto_id(tl_hba)); | |
1162 | return -EINVAL; | |
1163 | } | |
1164 | port_ptr = &i_port[0]; | |
1165 | goto check_newline; | |
1166 | } | |
6708bb27 | 1167 | pr_err("Unable to locate prefix for emulated Initiator Port:" |
3703b2c5 NB |
1168 | " %s\n", i_port); |
1169 | return -EINVAL; | |
1170 | /* | |
1171 | * Clear any trailing newline for the NAA WWN | |
1172 | */ | |
1173 | check_newline: | |
1174 | if (i_port[strlen(i_port)-1] == '\n') | |
1175 | i_port[strlen(i_port)-1] = '\0'; | |
1176 | ||
1177 | ret = tcm_loop_make_nexus(tl_tpg, port_ptr); | |
1178 | if (ret < 0) | |
1179 | return ret; | |
1180 | ||
1181 | return count; | |
1182 | } | |
1183 | ||
1184 | TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); | |
1185 | ||
1186 | static struct configfs_attribute *tcm_loop_tpg_attrs[] = { | |
1187 | &tcm_loop_tpg_nexus.attr, | |
1188 | NULL, | |
1189 | }; | |
1190 | ||
1191 | /* Start items for tcm_loop_naa_cit */ | |
1192 | ||
1193 | struct se_portal_group *tcm_loop_make_naa_tpg( | |
1194 | struct se_wwn *wwn, | |
1195 | struct config_group *group, | |
1196 | const char *name) | |
1197 | { | |
1198 | struct tcm_loop_hba *tl_hba = container_of(wwn, | |
1199 | struct tcm_loop_hba, tl_hba_wwn); | |
1200 | struct tcm_loop_tpg *tl_tpg; | |
1201 | char *tpgt_str, *end_ptr; | |
1202 | int ret; | |
1203 | unsigned short int tpgt; | |
1204 | ||
1205 | tpgt_str = strstr(name, "tpgt_"); | |
1206 | if (!tpgt_str) { | |
6708bb27 | 1207 | pr_err("Unable to locate \"tpgt_#\" directory" |
3703b2c5 NB |
1208 | " group\n"); |
1209 | return ERR_PTR(-EINVAL); | |
1210 | } | |
1211 | tpgt_str += 5; /* Skip ahead of "tpgt_" */ | |
1212 | tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0); | |
1213 | ||
12f09ccb | 1214 | if (tpgt >= TL_TPGS_PER_HBA) { |
6708bb27 | 1215 | pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:" |
3703b2c5 NB |
1216 | " %u\n", tpgt, TL_TPGS_PER_HBA); |
1217 | return ERR_PTR(-EINVAL); | |
1218 | } | |
1219 | tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; | |
1220 | tl_tpg->tl_hba = tl_hba; | |
1221 | tl_tpg->tl_tpgt = tpgt; | |
1222 | /* | |
1223 | * Register the tl_tpg as a emulated SAS TCM Target Endpoint | |
1224 | */ | |
1225 | ret = core_tpg_register(&tcm_loop_fabric_configfs->tf_ops, | |
5951146d | 1226 | wwn, &tl_tpg->tl_se_tpg, tl_tpg, |
3703b2c5 NB |
1227 | TRANSPORT_TPG_TYPE_NORMAL); |
1228 | if (ret < 0) | |
1229 | return ERR_PTR(-ENOMEM); | |
1230 | ||
6708bb27 | 1231 | pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" |
3703b2c5 NB |
1232 | " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), |
1233 | config_item_name(&wwn->wwn_group.cg_item), tpgt); | |
1234 | ||
1235 | return &tl_tpg->tl_se_tpg; | |
1236 | } | |
1237 | ||
1238 | void tcm_loop_drop_naa_tpg( | |
1239 | struct se_portal_group *se_tpg) | |
1240 | { | |
1241 | struct se_wwn *wwn = se_tpg->se_tpg_wwn; | |
1242 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1243 | struct tcm_loop_tpg, tl_se_tpg); | |
1244 | struct tcm_loop_hba *tl_hba; | |
1245 | unsigned short tpgt; | |
1246 | ||
1247 | tl_hba = tl_tpg->tl_hba; | |
1248 | tpgt = tl_tpg->tl_tpgt; | |
1249 | /* | |
1250 | * Release the I_T Nexus for the Virtual SAS link if present | |
1251 | */ | |
1252 | tcm_loop_drop_nexus(tl_tpg); | |
1253 | /* | |
1254 | * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint | |
1255 | */ | |
1256 | core_tpg_deregister(se_tpg); | |
1257 | ||
0a020436 NB |
1258 | tl_tpg->tl_hba = NULL; |
1259 | tl_tpg->tl_tpgt = 0; | |
1260 | ||
6708bb27 | 1261 | pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" |
3703b2c5 NB |
1262 | " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), |
1263 | config_item_name(&wwn->wwn_group.cg_item), tpgt); | |
1264 | } | |
1265 | ||
1266 | /* End items for tcm_loop_naa_cit */ | |
1267 | ||
1268 | /* Start items for tcm_loop_cit */ | |
1269 | ||
1270 | struct se_wwn *tcm_loop_make_scsi_hba( | |
1271 | struct target_fabric_configfs *tf, | |
1272 | struct config_group *group, | |
1273 | const char *name) | |
1274 | { | |
1275 | struct tcm_loop_hba *tl_hba; | |
1276 | struct Scsi_Host *sh; | |
1277 | char *ptr; | |
1278 | int ret, off = 0; | |
1279 | ||
1280 | tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); | |
1281 | if (!tl_hba) { | |
6708bb27 | 1282 | pr_err("Unable to allocate struct tcm_loop_hba\n"); |
3703b2c5 NB |
1283 | return ERR_PTR(-ENOMEM); |
1284 | } | |
1285 | /* | |
1286 | * Determine the emulated Protocol Identifier and Target Port Name | |
1287 | * based on the incoming configfs directory name. | |
1288 | */ | |
1289 | ptr = strstr(name, "naa."); | |
1290 | if (ptr) { | |
1291 | tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; | |
1292 | goto check_len; | |
1293 | } | |
1294 | ptr = strstr(name, "fc."); | |
1295 | if (ptr) { | |
1296 | tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; | |
1297 | off = 3; /* Skip over "fc." */ | |
1298 | goto check_len; | |
1299 | } | |
1300 | ptr = strstr(name, "iqn."); | |
a57b5d36 | 1301 | if (!ptr) { |
6708bb27 | 1302 | pr_err("Unable to locate prefix for emulated Target " |
a57b5d36 JJ |
1303 | "Port: %s\n", name); |
1304 | ret = -EINVAL; | |
1305 | goto out; | |
3703b2c5 | 1306 | } |
a57b5d36 | 1307 | tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; |
3703b2c5 NB |
1308 | |
1309 | check_len: | |
60d645a4 | 1310 | if (strlen(name) >= TL_WWN_ADDR_LEN) { |
6708bb27 | 1311 | pr_err("Emulated NAA %s Address: %s, exceeds" |
3703b2c5 NB |
1312 | " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), |
1313 | TL_WWN_ADDR_LEN); | |
a57b5d36 JJ |
1314 | ret = -EINVAL; |
1315 | goto out; | |
3703b2c5 NB |
1316 | } |
1317 | snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); | |
1318 | ||
1319 | /* | |
1320 | * Call device_register(tl_hba->dev) to register the emulated | |
1321 | * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after | |
1322 | * device_register() callbacks in tcm_loop_driver_probe() | |
1323 | */ | |
1324 | ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); | |
1325 | if (ret) | |
1326 | goto out; | |
1327 | ||
1328 | sh = tl_hba->sh; | |
1329 | tcm_loop_hba_no_cnt++; | |
6708bb27 | 1330 | pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" |
3703b2c5 NB |
1331 | " %s Address: %s at Linux/SCSI Host ID: %d\n", |
1332 | tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); | |
1333 | ||
1334 | return &tl_hba->tl_hba_wwn; | |
1335 | out: | |
1336 | kfree(tl_hba); | |
1337 | return ERR_PTR(ret); | |
1338 | } | |
1339 | ||
1340 | void tcm_loop_drop_scsi_hba( | |
1341 | struct se_wwn *wwn) | |
1342 | { | |
1343 | struct tcm_loop_hba *tl_hba = container_of(wwn, | |
1344 | struct tcm_loop_hba, tl_hba_wwn); | |
1345 | int host_no = tl_hba->sh->host_no; | |
1346 | /* | |
1347 | * Call device_unregister() on the original tl_hba->dev. | |
1348 | * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will | |
1349 | * release *tl_hba; | |
1350 | */ | |
1351 | device_unregister(&tl_hba->dev); | |
1352 | ||
6708bb27 | 1353 | pr_debug("TCM_Loop_ConfigFS: Deallocated emulated Target" |
3703b2c5 NB |
1354 | " SAS Address: %s at Linux/SCSI Host ID: %d\n", |
1355 | config_item_name(&wwn->wwn_group.cg_item), host_no); | |
1356 | } | |
1357 | ||
1358 | /* Start items for tcm_loop_cit */ | |
1359 | static ssize_t tcm_loop_wwn_show_attr_version( | |
1360 | struct target_fabric_configfs *tf, | |
1361 | char *page) | |
1362 | { | |
1363 | return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); | |
1364 | } | |
1365 | ||
1366 | TF_WWN_ATTR_RO(tcm_loop, version); | |
1367 | ||
1368 | static struct configfs_attribute *tcm_loop_wwn_attrs[] = { | |
1369 | &tcm_loop_wwn_version.attr, | |
1370 | NULL, | |
1371 | }; | |
1372 | ||
1373 | /* End items for tcm_loop_cit */ | |
1374 | ||
1375 | static int tcm_loop_register_configfs(void) | |
1376 | { | |
1377 | struct target_fabric_configfs *fabric; | |
1378 | struct config_group *tf_cg; | |
1379 | int ret; | |
1380 | /* | |
1381 | * Set the TCM Loop HBA counter to zero | |
1382 | */ | |
1383 | tcm_loop_hba_no_cnt = 0; | |
1384 | /* | |
1385 | * Register the top level struct config_item_type with TCM core | |
1386 | */ | |
1387 | fabric = target_fabric_configfs_init(THIS_MODULE, "loopback"); | |
e3d6f909 | 1388 | if (IS_ERR(fabric)) { |
6708bb27 | 1389 | pr_err("tcm_loop_register_configfs() failed!\n"); |
e3d6f909 | 1390 | return PTR_ERR(fabric); |
3703b2c5 NB |
1391 | } |
1392 | /* | |
1393 | * Setup the fabric API of function pointers used by target_core_mod | |
1394 | */ | |
1395 | fabric->tf_ops.get_fabric_name = &tcm_loop_get_fabric_name; | |
1396 | fabric->tf_ops.get_fabric_proto_ident = &tcm_loop_get_fabric_proto_ident; | |
1397 | fabric->tf_ops.tpg_get_wwn = &tcm_loop_get_endpoint_wwn; | |
1398 | fabric->tf_ops.tpg_get_tag = &tcm_loop_get_tag; | |
1399 | fabric->tf_ops.tpg_get_default_depth = &tcm_loop_get_default_depth; | |
1400 | fabric->tf_ops.tpg_get_pr_transport_id = &tcm_loop_get_pr_transport_id; | |
1401 | fabric->tf_ops.tpg_get_pr_transport_id_len = | |
1402 | &tcm_loop_get_pr_transport_id_len; | |
1403 | fabric->tf_ops.tpg_parse_pr_out_transport_id = | |
1404 | &tcm_loop_parse_pr_out_transport_id; | |
1405 | fabric->tf_ops.tpg_check_demo_mode = &tcm_loop_check_demo_mode; | |
1406 | fabric->tf_ops.tpg_check_demo_mode_cache = | |
1407 | &tcm_loop_check_demo_mode_cache; | |
1408 | fabric->tf_ops.tpg_check_demo_mode_write_protect = | |
1409 | &tcm_loop_check_demo_mode_write_protect; | |
1410 | fabric->tf_ops.tpg_check_prod_mode_write_protect = | |
1411 | &tcm_loop_check_prod_mode_write_protect; | |
1412 | /* | |
1413 | * The TCM loopback fabric module runs in demo-mode to a local | |
1414 | * virtual SCSI device, so fabric dependent initator ACLs are | |
1415 | * not required. | |
1416 | */ | |
1417 | fabric->tf_ops.tpg_alloc_fabric_acl = &tcm_loop_tpg_alloc_fabric_acl; | |
1418 | fabric->tf_ops.tpg_release_fabric_acl = | |
1419 | &tcm_loop_tpg_release_fabric_acl; | |
1420 | fabric->tf_ops.tpg_get_inst_index = &tcm_loop_get_inst_index; | |
3703b2c5 NB |
1421 | /* |
1422 | * Used for setting up remaining TCM resources in process context | |
1423 | */ | |
1424 | fabric->tf_ops.new_cmd_map = &tcm_loop_new_cmd_map; | |
1425 | fabric->tf_ops.check_stop_free = &tcm_loop_check_stop_free; | |
35462975 | 1426 | fabric->tf_ops.release_cmd = &tcm_loop_release_cmd; |
3703b2c5 NB |
1427 | fabric->tf_ops.shutdown_session = &tcm_loop_shutdown_session; |
1428 | fabric->tf_ops.close_session = &tcm_loop_close_session; | |
1429 | fabric->tf_ops.stop_session = &tcm_loop_stop_session; | |
1430 | fabric->tf_ops.fall_back_to_erl0 = &tcm_loop_fall_back_to_erl0; | |
1431 | fabric->tf_ops.sess_logged_in = &tcm_loop_sess_logged_in; | |
1432 | fabric->tf_ops.sess_get_index = &tcm_loop_sess_get_index; | |
1433 | fabric->tf_ops.sess_get_initiator_sid = NULL; | |
1434 | fabric->tf_ops.write_pending = &tcm_loop_write_pending; | |
1435 | fabric->tf_ops.write_pending_status = &tcm_loop_write_pending_status; | |
1436 | /* | |
1437 | * Not used for TCM loopback | |
1438 | */ | |
1439 | fabric->tf_ops.set_default_node_attributes = | |
1440 | &tcm_loop_set_default_node_attributes; | |
1441 | fabric->tf_ops.get_task_tag = &tcm_loop_get_task_tag; | |
1442 | fabric->tf_ops.get_cmd_state = &tcm_loop_get_cmd_state; | |
3703b2c5 NB |
1443 | fabric->tf_ops.queue_data_in = &tcm_loop_queue_data_in; |
1444 | fabric->tf_ops.queue_status = &tcm_loop_queue_status; | |
1445 | fabric->tf_ops.queue_tm_rsp = &tcm_loop_queue_tm_rsp; | |
1446 | fabric->tf_ops.set_fabric_sense_len = &tcm_loop_set_fabric_sense_len; | |
1447 | fabric->tf_ops.get_fabric_sense_len = &tcm_loop_get_fabric_sense_len; | |
1448 | fabric->tf_ops.is_state_remove = &tcm_loop_is_state_remove; | |
3703b2c5 NB |
1449 | |
1450 | tf_cg = &fabric->tf_group; | |
1451 | /* | |
1452 | * Setup function pointers for generic logic in target_core_fabric_configfs.c | |
1453 | */ | |
1454 | fabric->tf_ops.fabric_make_wwn = &tcm_loop_make_scsi_hba; | |
1455 | fabric->tf_ops.fabric_drop_wwn = &tcm_loop_drop_scsi_hba; | |
1456 | fabric->tf_ops.fabric_make_tpg = &tcm_loop_make_naa_tpg; | |
1457 | fabric->tf_ops.fabric_drop_tpg = &tcm_loop_drop_naa_tpg; | |
1458 | /* | |
1459 | * fabric_post_link() and fabric_pre_unlink() are used for | |
1460 | * registration and release of TCM Loop Virtual SCSI LUNs. | |
1461 | */ | |
1462 | fabric->tf_ops.fabric_post_link = &tcm_loop_port_link; | |
1463 | fabric->tf_ops.fabric_pre_unlink = &tcm_loop_port_unlink; | |
1464 | fabric->tf_ops.fabric_make_np = NULL; | |
1465 | fabric->tf_ops.fabric_drop_np = NULL; | |
1466 | /* | |
1467 | * Setup default attribute lists for various fabric->tf_cit_tmpl | |
1468 | */ | |
1469 | TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_loop_wwn_attrs; | |
1470 | TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_loop_tpg_attrs; | |
1471 | TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL; | |
1472 | TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL; | |
1473 | TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL; | |
1474 | /* | |
1475 | * Once fabric->tf_ops has been setup, now register the fabric for | |
1476 | * use within TCM | |
1477 | */ | |
1478 | ret = target_fabric_configfs_register(fabric); | |
1479 | if (ret < 0) { | |
6708bb27 | 1480 | pr_err("target_fabric_configfs_register() for" |
3703b2c5 NB |
1481 | " TCM_Loop failed!\n"); |
1482 | target_fabric_configfs_free(fabric); | |
1483 | return -1; | |
1484 | } | |
1485 | /* | |
1486 | * Setup our local pointer to *fabric. | |
1487 | */ | |
1488 | tcm_loop_fabric_configfs = fabric; | |
6708bb27 | 1489 | pr_debug("TCM_LOOP[0] - Set fabric ->" |
3703b2c5 NB |
1490 | " tcm_loop_fabric_configfs\n"); |
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | static void tcm_loop_deregister_configfs(void) | |
1495 | { | |
1496 | if (!tcm_loop_fabric_configfs) | |
1497 | return; | |
1498 | ||
1499 | target_fabric_configfs_deregister(tcm_loop_fabric_configfs); | |
1500 | tcm_loop_fabric_configfs = NULL; | |
6708bb27 | 1501 | pr_debug("TCM_LOOP[0] - Cleared" |
3703b2c5 NB |
1502 | " tcm_loop_fabric_configfs\n"); |
1503 | } | |
1504 | ||
1505 | static int __init tcm_loop_fabric_init(void) | |
1506 | { | |
1507 | int ret; | |
1508 | ||
1509 | tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", | |
1510 | sizeof(struct tcm_loop_cmd), | |
1511 | __alignof__(struct tcm_loop_cmd), | |
1512 | 0, NULL); | |
1513 | if (!tcm_loop_cmd_cache) { | |
6708bb27 | 1514 | pr_debug("kmem_cache_create() for" |
3703b2c5 NB |
1515 | " tcm_loop_cmd_cache failed\n"); |
1516 | return -ENOMEM; | |
1517 | } | |
1518 | ||
1519 | ret = tcm_loop_alloc_core_bus(); | |
1520 | if (ret) | |
1521 | return ret; | |
1522 | ||
1523 | ret = tcm_loop_register_configfs(); | |
1524 | if (ret) { | |
1525 | tcm_loop_release_core_bus(); | |
1526 | return ret; | |
1527 | } | |
1528 | ||
1529 | return 0; | |
1530 | } | |
1531 | ||
1532 | static void __exit tcm_loop_fabric_exit(void) | |
1533 | { | |
1534 | tcm_loop_deregister_configfs(); | |
1535 | tcm_loop_release_core_bus(); | |
1536 | kmem_cache_destroy(tcm_loop_cmd_cache); | |
1537 | } | |
1538 | ||
1539 | MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); | |
1540 | MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>"); | |
1541 | MODULE_LICENSE("GPL"); | |
1542 | module_init(tcm_loop_fabric_init); | |
1543 | module_exit(tcm_loop_fabric_exit); |