Commit | Line | Data |
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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 | * | |
4c76251e | 6 | * © Copyright 2011-2013 Datera, Inc. |
3703b2c5 NB |
7 | * |
8 | * Licensed to the Linux Foundation under the General Public License (GPL) version 2. | |
9 | * | |
10 | * Author: Nicholas A. Bellinger <nab@risingtidesystems.com> | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or | |
15 | * (at your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, | |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20 | * GNU General Public License for more details. | |
21 | ****************************************************************************/ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/moduleparam.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/configfs.h> | |
29 | #include <scsi/scsi.h> | |
30 | #include <scsi/scsi_tcq.h> | |
31 | #include <scsi/scsi_host.h> | |
32 | #include <scsi/scsi_device.h> | |
33 | #include <scsi/scsi_cmnd.h> | |
3703b2c5 NB |
34 | |
35 | #include <target/target_core_base.h> | |
c4795fb2 | 36 | #include <target/target_core_fabric.h> |
3703b2c5 | 37 | #include <target/target_core_fabric_configfs.h> |
3703b2c5 NB |
38 | |
39 | #include "tcm_loop.h" | |
40 | ||
41 | #define to_tcm_loop_hba(hba) container_of(hba, struct tcm_loop_hba, dev) | |
42 | ||
afe2cb7f | 43 | static struct workqueue_struct *tcm_loop_workqueue; |
3703b2c5 NB |
44 | static struct kmem_cache *tcm_loop_cmd_cache; |
45 | ||
46 | static int tcm_loop_hba_no_cnt; | |
47 | ||
16786454 | 48 | static int tcm_loop_queue_status(struct se_cmd *se_cmd); |
3703b2c5 NB |
49 | |
50 | /* | |
51 | * Called from struct target_core_fabric_ops->check_stop_free() | |
52 | */ | |
88dd9e26 | 53 | static int tcm_loop_check_stop_free(struct se_cmd *se_cmd) |
3703b2c5 NB |
54 | { |
55 | /* | |
56 | * Do not release struct se_cmd's containing a valid TMR | |
57 | * pointer. These will be released directly in tcm_loop_device_reset() | |
58 | * with transport_generic_free_cmd(). | |
59 | */ | |
c8e31f26 | 60 | if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) |
88dd9e26 | 61 | return 0; |
3703b2c5 NB |
62 | /* |
63 | * Release the struct se_cmd, which will make a callback to release | |
64 | * struct tcm_loop_cmd * in tcm_loop_deallocate_core_cmd() | |
65 | */ | |
82f1c8a4 | 66 | transport_generic_free_cmd(se_cmd, 0); |
88dd9e26 | 67 | return 1; |
3703b2c5 NB |
68 | } |
69 | ||
35462975 | 70 | static void tcm_loop_release_cmd(struct se_cmd *se_cmd) |
3703b2c5 NB |
71 | { |
72 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
73 | struct tcm_loop_cmd, tl_se_cmd); | |
74 | ||
75 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); | |
76 | } | |
77 | ||
8946b077 | 78 | static int tcm_loop_show_info(struct seq_file *m, struct Scsi_Host *host) |
3703b2c5 | 79 | { |
8946b077 AV |
80 | seq_printf(m, "tcm_loop_proc_info()\n"); |
81 | return 0; | |
3703b2c5 NB |
82 | } |
83 | ||
84 | static int tcm_loop_driver_probe(struct device *); | |
85 | static int tcm_loop_driver_remove(struct device *); | |
86 | ||
87 | static int pseudo_lld_bus_match(struct device *dev, | |
88 | struct device_driver *dev_driver) | |
89 | { | |
90 | return 1; | |
91 | } | |
92 | ||
93 | static struct bus_type tcm_loop_lld_bus = { | |
94 | .name = "tcm_loop_bus", | |
95 | .match = pseudo_lld_bus_match, | |
96 | .probe = tcm_loop_driver_probe, | |
97 | .remove = tcm_loop_driver_remove, | |
98 | }; | |
99 | ||
100 | static struct device_driver tcm_loop_driverfs = { | |
101 | .name = "tcm_loop", | |
102 | .bus = &tcm_loop_lld_bus, | |
103 | }; | |
104 | /* | |
105 | * Used with root_device_register() in tcm_loop_alloc_core_bus() below | |
106 | */ | |
6e1a27b9 | 107 | static struct device *tcm_loop_primary; |
3703b2c5 | 108 | |
afe2cb7f | 109 | static void tcm_loop_submission_work(struct work_struct *work) |
3703b2c5 | 110 | { |
afe2cb7f CH |
111 | struct tcm_loop_cmd *tl_cmd = |
112 | container_of(work, struct tcm_loop_cmd, work); | |
113 | struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd; | |
114 | struct scsi_cmnd *sc = tl_cmd->sc; | |
115 | struct tcm_loop_nexus *tl_nexus; | |
3703b2c5 NB |
116 | struct tcm_loop_hba *tl_hba; |
117 | struct tcm_loop_tpg *tl_tpg; | |
16786454 | 118 | struct scatterlist *sgl_bidi = NULL; |
e2a4f55c | 119 | u32 sgl_bidi_count = 0, transfer_length; |
8f9f44f8 | 120 | int rc; |
3703b2c5 | 121 | |
3703b2c5 NB |
122 | tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); |
123 | tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; | |
afe2cb7f | 124 | |
0a020436 NB |
125 | /* |
126 | * Ensure that this tl_tpg reference from the incoming sc->device->id | |
127 | * has already been configured via tcm_loop_make_naa_tpg(). | |
128 | */ | |
129 | if (!tl_tpg->tl_hba) { | |
130 | set_host_byte(sc, DID_NO_CONNECT); | |
f872c9f4 | 131 | goto out_done; |
0a020436 | 132 | } |
fb2b2844 HR |
133 | if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) { |
134 | set_host_byte(sc, DID_TRANSPORT_DISRUPTED); | |
135 | goto out_done; | |
136 | } | |
506787a2 | 137 | tl_nexus = tl_tpg->tl_nexus; |
f872c9f4 CH |
138 | if (!tl_nexus) { |
139 | scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus" | |
140 | " does not exist\n"); | |
141 | set_host_byte(sc, DID_ERROR); | |
142 | goto out_done; | |
3703b2c5 | 143 | } |
16786454 CH |
144 | if (scsi_bidi_cmnd(sc)) { |
145 | struct scsi_data_buffer *sdb = scsi_in(sc); | |
146 | ||
147 | sgl_bidi = sdb->table.sgl; | |
148 | sgl_bidi_count = sdb->table.nents; | |
f872c9f4 CH |
149 | se_cmd->se_cmd_flags |= SCF_BIDI; |
150 | ||
16786454 | 151 | } |
b5b8e298 | 152 | |
e2a4f55c SG |
153 | transfer_length = scsi_transfer_length(sc); |
154 | if (!scsi_prot_sg_count(sc) && | |
155 | scsi_get_prot_op(sc) != SCSI_PROT_NORMAL) { | |
b5b8e298 | 156 | se_cmd->prot_pto = true; |
e2a4f55c SG |
157 | /* |
158 | * loopback transport doesn't support | |
159 | * WRITE_GENERATE, READ_STRIP protection | |
160 | * information operations, go ahead unprotected. | |
161 | */ | |
162 | transfer_length = scsi_bufflen(sc); | |
163 | } | |
b5b8e298 | 164 | |
649ee054 | 165 | se_cmd->tag = tl_cmd->sc_cmd_tag; |
8f9f44f8 NB |
166 | rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd, |
167 | &tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun, | |
68d81f40 | 168 | transfer_length, TCM_SIMPLE_TAG, |
8f9f44f8 NB |
169 | sc->sc_data_direction, 0, |
170 | scsi_sglist(sc), scsi_sg_count(sc), | |
59dedde2 NB |
171 | sgl_bidi, sgl_bidi_count, |
172 | scsi_prot_sglist(sc), scsi_prot_sg_count(sc)); | |
8f9f44f8 | 173 | if (rc < 0) { |
f872c9f4 CH |
174 | set_host_byte(sc, DID_NO_CONNECT); |
175 | goto out_done; | |
176 | } | |
afe2cb7f | 177 | return; |
f872c9f4 CH |
178 | |
179 | out_done: | |
b43f1886 | 180 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); |
f872c9f4 | 181 | sc->scsi_done(sc); |
afe2cb7f CH |
182 | return; |
183 | } | |
184 | ||
185 | /* | |
186 | * ->queuecommand can be and usually is called from interrupt context, so | |
187 | * defer the actual submission to a workqueue. | |
188 | */ | |
189 | static int tcm_loop_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc) | |
190 | { | |
191 | struct tcm_loop_cmd *tl_cmd; | |
192 | ||
9cb78c16 | 193 | pr_debug("tcm_loop_queuecommand() %d:%d:%d:%llu got CDB: 0x%02x" |
afe2cb7f CH |
194 | " scsi_buf_len: %u\n", sc->device->host->host_no, |
195 | sc->device->id, sc->device->channel, sc->device->lun, | |
196 | sc->cmnd[0], scsi_bufflen(sc)); | |
197 | ||
198 | tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_ATOMIC); | |
199 | if (!tl_cmd) { | |
200 | pr_err("Unable to allocate struct tcm_loop_cmd\n"); | |
201 | set_host_byte(sc, DID_ERROR); | |
202 | sc->scsi_done(sc); | |
203 | return 0; | |
204 | } | |
205 | ||
206 | tl_cmd->sc = sc; | |
6375f890 | 207 | tl_cmd->sc_cmd_tag = sc->request->tag; |
afe2cb7f CH |
208 | INIT_WORK(&tl_cmd->work, tcm_loop_submission_work); |
209 | queue_work(tcm_loop_workqueue, &tl_cmd->work); | |
f872c9f4 | 210 | return 0; |
3703b2c5 NB |
211 | } |
212 | ||
213 | /* | |
214 | * Called from SCSI EH process context to issue a LUN_RESET TMR | |
215 | * to struct scsi_device | |
216 | */ | |
a314d700 | 217 | static int tcm_loop_issue_tmr(struct tcm_loop_tpg *tl_tpg, |
f2d30680 | 218 | u64 lun, int task, enum tcm_tmreq_table tmr) |
3703b2c5 NB |
219 | { |
220 | struct se_cmd *se_cmd = NULL; | |
3703b2c5 | 221 | struct se_session *se_sess; |
a314d700 | 222 | struct se_portal_group *se_tpg; |
506787a2 | 223 | struct tcm_loop_nexus *tl_nexus; |
3703b2c5 | 224 | struct tcm_loop_cmd *tl_cmd = NULL; |
3703b2c5 | 225 | struct tcm_loop_tmr *tl_tmr = NULL; |
a314d700 | 226 | int ret = TMR_FUNCTION_FAILED, rc; |
3703b2c5 | 227 | |
506787a2 HR |
228 | /* |
229 | * Locate the tl_nexus and se_sess pointers | |
230 | */ | |
231 | tl_nexus = tl_tpg->tl_nexus; | |
232 | if (!tl_nexus) { | |
233 | pr_err("Unable to perform device reset without" | |
234 | " active I_T Nexus\n"); | |
235 | return ret; | |
236 | } | |
237 | ||
3703b2c5 NB |
238 | tl_cmd = kmem_cache_zalloc(tcm_loop_cmd_cache, GFP_KERNEL); |
239 | if (!tl_cmd) { | |
6708bb27 | 240 | pr_err("Unable to allocate memory for tl_cmd\n"); |
a314d700 | 241 | return ret; |
3703b2c5 NB |
242 | } |
243 | ||
244 | tl_tmr = kzalloc(sizeof(struct tcm_loop_tmr), GFP_KERNEL); | |
245 | if (!tl_tmr) { | |
6708bb27 | 246 | pr_err("Unable to allocate memory for tl_tmr\n"); |
3703b2c5 NB |
247 | goto release; |
248 | } | |
249 | init_waitqueue_head(&tl_tmr->tl_tmr_wait); | |
250 | ||
251 | se_cmd = &tl_cmd->tl_se_cmd; | |
a314d700 | 252 | se_tpg = &tl_tpg->tl_se_tpg; |
506787a2 | 253 | se_sess = tl_tpg->tl_nexus->se_sess; |
3703b2c5 NB |
254 | /* |
255 | * Initialize struct se_cmd descriptor from target_core_mod infrastructure | |
256 | */ | |
257 | transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess, 0, | |
68d81f40 | 258 | DMA_NONE, TCM_SIMPLE_TAG, |
3703b2c5 | 259 | &tl_cmd->tl_sense_buf[0]); |
c8e31f26 | 260 | |
a314d700 | 261 | rc = core_tmr_alloc_req(se_cmd, tl_tmr, tmr, GFP_KERNEL); |
c8e31f26 | 262 | if (rc < 0) |
3703b2c5 | 263 | goto release; |
a314d700 | 264 | |
969871cd HR |
265 | if (tmr == TMR_ABORT_TASK) |
266 | se_cmd->se_tmr_req->ref_task_tag = task; | |
267 | ||
3703b2c5 | 268 | /* |
a314d700 | 269 | * Locate the underlying TCM struct se_lun |
3703b2c5 | 270 | */ |
a314d700 HR |
271 | if (transport_lookup_tmr_lun(se_cmd, lun) < 0) { |
272 | ret = TMR_LUN_DOES_NOT_EXIST; | |
3703b2c5 | 273 | goto release; |
a314d700 | 274 | } |
3703b2c5 | 275 | /* |
a314d700 HR |
276 | * Queue the TMR to TCM Core and sleep waiting for |
277 | * tcm_loop_queue_tm_rsp() to wake us up. | |
3703b2c5 NB |
278 | */ |
279 | transport_generic_handle_tmr(se_cmd); | |
280 | wait_event(tl_tmr->tl_tmr_wait, atomic_read(&tl_tmr->tmr_complete)); | |
281 | /* | |
282 | * The TMR LUN_RESET has completed, check the response status and | |
283 | * then release allocations. | |
284 | */ | |
a314d700 | 285 | ret = se_cmd->se_tmr_req->response; |
3703b2c5 NB |
286 | release: |
287 | if (se_cmd) | |
82f1c8a4 | 288 | transport_generic_free_cmd(se_cmd, 1); |
3703b2c5 NB |
289 | else |
290 | kmem_cache_free(tcm_loop_cmd_cache, tl_cmd); | |
291 | kfree(tl_tmr); | |
292 | return ret; | |
293 | } | |
294 | ||
969871cd HR |
295 | static int tcm_loop_abort_task(struct scsi_cmnd *sc) |
296 | { | |
297 | struct tcm_loop_hba *tl_hba; | |
969871cd HR |
298 | struct tcm_loop_tpg *tl_tpg; |
299 | int ret = FAILED; | |
300 | ||
301 | /* | |
302 | * Locate the tcm_loop_hba_t pointer | |
303 | */ | |
304 | tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); | |
969871cd | 305 | tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; |
506787a2 | 306 | ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun, |
6375f890 | 307 | sc->request->tag, TMR_ABORT_TASK); |
969871cd HR |
308 | return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; |
309 | } | |
310 | ||
a314d700 HR |
311 | /* |
312 | * Called from SCSI EH process context to issue a LUN_RESET TMR | |
313 | * to struct scsi_device | |
314 | */ | |
315 | static int tcm_loop_device_reset(struct scsi_cmnd *sc) | |
316 | { | |
317 | struct tcm_loop_hba *tl_hba; | |
a314d700 HR |
318 | struct tcm_loop_tpg *tl_tpg; |
319 | int ret = FAILED; | |
320 | ||
321 | /* | |
322 | * Locate the tcm_loop_hba_t pointer | |
323 | */ | |
324 | tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); | |
a314d700 | 325 | tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; |
506787a2 HR |
326 | |
327 | ret = tcm_loop_issue_tmr(tl_tpg, sc->device->lun, | |
969871cd | 328 | 0, TMR_LUN_RESET); |
a314d700 HR |
329 | return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED; |
330 | } | |
331 | ||
8f4a1fb0 HR |
332 | static int tcm_loop_target_reset(struct scsi_cmnd *sc) |
333 | { | |
334 | struct tcm_loop_hba *tl_hba; | |
335 | struct tcm_loop_tpg *tl_tpg; | |
336 | ||
337 | /* | |
338 | * Locate the tcm_loop_hba_t pointer | |
339 | */ | |
340 | tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host); | |
341 | if (!tl_hba) { | |
342 | pr_err("Unable to perform device reset without" | |
343 | " active I_T Nexus\n"); | |
344 | return FAILED; | |
345 | } | |
346 | /* | |
347 | * Locate the tl_tpg pointer from TargetID in sc->device->id | |
348 | */ | |
349 | tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id]; | |
350 | if (tl_tpg) { | |
351 | tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; | |
352 | return SUCCESS; | |
353 | } | |
354 | return FAILED; | |
355 | } | |
356 | ||
3703b2c5 NB |
357 | static int tcm_loop_slave_alloc(struct scsi_device *sd) |
358 | { | |
359 | set_bit(QUEUE_FLAG_BIDI, &sd->request_queue->queue_flags); | |
360 | return 0; | |
361 | } | |
362 | ||
3703b2c5 | 363 | static struct scsi_host_template tcm_loop_driver_template = { |
8946b077 | 364 | .show_info = tcm_loop_show_info, |
3703b2c5 NB |
365 | .proc_name = "tcm_loopback", |
366 | .name = "TCM_Loopback", | |
367 | .queuecommand = tcm_loop_queuecommand, | |
db5ed4df | 368 | .change_queue_depth = scsi_change_queue_depth, |
969871cd | 369 | .eh_abort_handler = tcm_loop_abort_task, |
3703b2c5 | 370 | .eh_device_reset_handler = tcm_loop_device_reset, |
8f4a1fb0 | 371 | .eh_target_reset_handler = tcm_loop_target_reset, |
2e88efd3 | 372 | .can_queue = 1024, |
3703b2c5 | 373 | .this_id = -1, |
2e88efd3 CH |
374 | .sg_tablesize = 256, |
375 | .cmd_per_lun = 1024, | |
376 | .max_sectors = 0xFFFF, | |
3703b2c5 NB |
377 | .use_clustering = DISABLE_CLUSTERING, |
378 | .slave_alloc = tcm_loop_slave_alloc, | |
3703b2c5 | 379 | .module = THIS_MODULE, |
2ecb204d | 380 | .use_blk_tags = 1, |
c40ecc12 | 381 | .track_queue_depth = 1, |
3703b2c5 NB |
382 | }; |
383 | ||
384 | static int tcm_loop_driver_probe(struct device *dev) | |
385 | { | |
386 | struct tcm_loop_hba *tl_hba; | |
387 | struct Scsi_Host *sh; | |
59dedde2 | 388 | int error, host_prot; |
3703b2c5 NB |
389 | |
390 | tl_hba = to_tcm_loop_hba(dev); | |
391 | ||
392 | sh = scsi_host_alloc(&tcm_loop_driver_template, | |
393 | sizeof(struct tcm_loop_hba)); | |
394 | if (!sh) { | |
6708bb27 | 395 | pr_err("Unable to allocate struct scsi_host\n"); |
3703b2c5 NB |
396 | return -ENODEV; |
397 | } | |
398 | tl_hba->sh = sh; | |
399 | ||
400 | /* | |
401 | * Assign the struct tcm_loop_hba pointer to struct Scsi_Host->hostdata | |
402 | */ | |
403 | *((struct tcm_loop_hba **)sh->hostdata) = tl_hba; | |
404 | /* | |
405 | * Setup single ID, Channel and LUN for now.. | |
406 | */ | |
407 | sh->max_id = 2; | |
408 | sh->max_lun = 0; | |
409 | sh->max_channel = 0; | |
9736f4ad | 410 | sh->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE; |
3703b2c5 | 411 | |
59dedde2 NB |
412 | host_prot = SHOST_DIF_TYPE1_PROTECTION | SHOST_DIF_TYPE2_PROTECTION | |
413 | SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE1_PROTECTION | | |
414 | SHOST_DIX_TYPE2_PROTECTION | SHOST_DIX_TYPE3_PROTECTION; | |
415 | ||
416 | scsi_host_set_prot(sh, host_prot); | |
417 | scsi_host_set_guard(sh, SHOST_DIX_GUARD_CRC); | |
418 | ||
3703b2c5 NB |
419 | error = scsi_add_host(sh, &tl_hba->dev); |
420 | if (error) { | |
6708bb27 | 421 | pr_err("%s: scsi_add_host failed\n", __func__); |
3703b2c5 NB |
422 | scsi_host_put(sh); |
423 | return -ENODEV; | |
424 | } | |
425 | return 0; | |
426 | } | |
427 | ||
428 | static int tcm_loop_driver_remove(struct device *dev) | |
429 | { | |
430 | struct tcm_loop_hba *tl_hba; | |
431 | struct Scsi_Host *sh; | |
432 | ||
433 | tl_hba = to_tcm_loop_hba(dev); | |
434 | sh = tl_hba->sh; | |
435 | ||
436 | scsi_remove_host(sh); | |
437 | scsi_host_put(sh); | |
438 | return 0; | |
439 | } | |
440 | ||
441 | static void tcm_loop_release_adapter(struct device *dev) | |
442 | { | |
443 | struct tcm_loop_hba *tl_hba = to_tcm_loop_hba(dev); | |
444 | ||
445 | kfree(tl_hba); | |
446 | } | |
447 | ||
448 | /* | |
449 | * Called from tcm_loop_make_scsi_hba() in tcm_loop_configfs.c | |
450 | */ | |
451 | static int tcm_loop_setup_hba_bus(struct tcm_loop_hba *tl_hba, int tcm_loop_host_id) | |
452 | { | |
453 | int ret; | |
454 | ||
455 | tl_hba->dev.bus = &tcm_loop_lld_bus; | |
456 | tl_hba->dev.parent = tcm_loop_primary; | |
457 | tl_hba->dev.release = &tcm_loop_release_adapter; | |
458 | dev_set_name(&tl_hba->dev, "tcm_loop_adapter_%d", tcm_loop_host_id); | |
459 | ||
460 | ret = device_register(&tl_hba->dev); | |
461 | if (ret) { | |
6708bb27 | 462 | pr_err("device_register() failed for" |
3703b2c5 NB |
463 | " tl_hba->dev: %d\n", ret); |
464 | return -ENODEV; | |
465 | } | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | /* | |
471 | * Called from tcm_loop_fabric_init() in tcl_loop_fabric.c to load the emulated | |
472 | * tcm_loop SCSI bus. | |
473 | */ | |
474 | static int tcm_loop_alloc_core_bus(void) | |
475 | { | |
476 | int ret; | |
477 | ||
478 | tcm_loop_primary = root_device_register("tcm_loop_0"); | |
479 | if (IS_ERR(tcm_loop_primary)) { | |
6708bb27 | 480 | pr_err("Unable to allocate tcm_loop_primary\n"); |
3703b2c5 NB |
481 | return PTR_ERR(tcm_loop_primary); |
482 | } | |
483 | ||
484 | ret = bus_register(&tcm_loop_lld_bus); | |
485 | if (ret) { | |
6708bb27 | 486 | pr_err("bus_register() failed for tcm_loop_lld_bus\n"); |
3703b2c5 NB |
487 | goto dev_unreg; |
488 | } | |
489 | ||
490 | ret = driver_register(&tcm_loop_driverfs); | |
491 | if (ret) { | |
6708bb27 | 492 | pr_err("driver_register() failed for" |
3703b2c5 NB |
493 | "tcm_loop_driverfs\n"); |
494 | goto bus_unreg; | |
495 | } | |
496 | ||
6708bb27 | 497 | pr_debug("Initialized TCM Loop Core Bus\n"); |
3703b2c5 NB |
498 | return ret; |
499 | ||
500 | bus_unreg: | |
501 | bus_unregister(&tcm_loop_lld_bus); | |
502 | dev_unreg: | |
503 | root_device_unregister(tcm_loop_primary); | |
504 | return ret; | |
505 | } | |
506 | ||
507 | static void tcm_loop_release_core_bus(void) | |
508 | { | |
509 | driver_unregister(&tcm_loop_driverfs); | |
510 | bus_unregister(&tcm_loop_lld_bus); | |
511 | root_device_unregister(tcm_loop_primary); | |
512 | ||
6708bb27 | 513 | pr_debug("Releasing TCM Loop Core BUS\n"); |
3703b2c5 NB |
514 | } |
515 | ||
516 | static char *tcm_loop_get_fabric_name(void) | |
517 | { | |
518 | return "loopback"; | |
519 | } | |
520 | ||
1667a459 CH |
521 | static inline struct tcm_loop_tpg *tl_tpg(struct se_portal_group *se_tpg) |
522 | { | |
523 | return container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); | |
524 | } | |
525 | ||
3703b2c5 NB |
526 | static char *tcm_loop_get_endpoint_wwn(struct se_portal_group *se_tpg) |
527 | { | |
3703b2c5 NB |
528 | /* |
529 | * Return the passed NAA identifier for the SAS Target Port | |
530 | */ | |
1667a459 | 531 | return &tl_tpg(se_tpg)->tl_hba->tl_wwn_address[0]; |
3703b2c5 NB |
532 | } |
533 | ||
534 | static u16 tcm_loop_get_tag(struct se_portal_group *se_tpg) | |
535 | { | |
3703b2c5 NB |
536 | /* |
537 | * This Tag is used when forming SCSI Name identifier in EVPD=1 0x83 | |
538 | * to represent the SCSI Target Port. | |
539 | */ | |
1667a459 | 540 | return tl_tpg(se_tpg)->tl_tpgt; |
3703b2c5 NB |
541 | } |
542 | ||
3703b2c5 NB |
543 | /* |
544 | * Returning (1) here allows for target_core_mod struct se_node_acl to be generated | |
545 | * based upon the incoming fabric dependent SCSI Initiator Port | |
546 | */ | |
547 | static int tcm_loop_check_demo_mode(struct se_portal_group *se_tpg) | |
548 | { | |
549 | return 1; | |
550 | } | |
551 | ||
552 | static int tcm_loop_check_demo_mode_cache(struct se_portal_group *se_tpg) | |
553 | { | |
554 | return 0; | |
555 | } | |
556 | ||
557 | /* | |
558 | * Allow I_T Nexus full READ-WRITE access without explict Initiator Node ACLs for | |
559 | * local virtual Linux/SCSI LLD passthrough into VM hypervisor guest | |
560 | */ | |
561 | static int tcm_loop_check_demo_mode_write_protect(struct se_portal_group *se_tpg) | |
562 | { | |
563 | return 0; | |
564 | } | |
565 | ||
566 | /* | |
567 | * Because TCM_Loop does not use explict ACLs and MappedLUNs, this will | |
568 | * never be called for TCM_Loop by target_core_fabric_configfs.c code. | |
569 | * It has been added here as a nop for target_fabric_tf_ops_check() | |
570 | */ | |
571 | static int tcm_loop_check_prod_mode_write_protect(struct se_portal_group *se_tpg) | |
572 | { | |
573 | return 0; | |
574 | } | |
575 | ||
436f4a0a NB |
576 | static int tcm_loop_check_prot_fabric_only(struct se_portal_group *se_tpg) |
577 | { | |
578 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, | |
579 | tl_se_tpg); | |
580 | return tl_tpg->tl_fabric_prot_type; | |
581 | } | |
582 | ||
3703b2c5 NB |
583 | static u32 tcm_loop_get_inst_index(struct se_portal_group *se_tpg) |
584 | { | |
585 | return 1; | |
586 | } | |
587 | ||
3703b2c5 NB |
588 | static u32 tcm_loop_sess_get_index(struct se_session *se_sess) |
589 | { | |
590 | return 1; | |
591 | } | |
592 | ||
593 | static void tcm_loop_set_default_node_attributes(struct se_node_acl *se_acl) | |
594 | { | |
595 | return; | |
596 | } | |
597 | ||
3703b2c5 NB |
598 | static int tcm_loop_get_cmd_state(struct se_cmd *se_cmd) |
599 | { | |
600 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
601 | struct tcm_loop_cmd, tl_se_cmd); | |
602 | ||
603 | return tl_cmd->sc_cmd_state; | |
604 | } | |
605 | ||
606 | static int tcm_loop_shutdown_session(struct se_session *se_sess) | |
607 | { | |
608 | return 0; | |
609 | } | |
610 | ||
611 | static void tcm_loop_close_session(struct se_session *se_sess) | |
612 | { | |
613 | return; | |
614 | }; | |
615 | ||
3703b2c5 NB |
616 | static int tcm_loop_write_pending(struct se_cmd *se_cmd) |
617 | { | |
618 | /* | |
619 | * Since Linux/SCSI has already sent down a struct scsi_cmnd | |
620 | * sc->sc_data_direction of DMA_TO_DEVICE with struct scatterlist array | |
621 | * memory, and memory has already been mapped to struct se_cmd->t_mem_list | |
622 | * format with transport_generic_map_mem_to_cmd(). | |
623 | * | |
624 | * We now tell TCM to add this WRITE CDB directly into the TCM storage | |
625 | * object execution queue. | |
626 | */ | |
70baf0ab | 627 | target_execute_cmd(se_cmd); |
3703b2c5 NB |
628 | return 0; |
629 | } | |
630 | ||
631 | static int tcm_loop_write_pending_status(struct se_cmd *se_cmd) | |
632 | { | |
633 | return 0; | |
634 | } | |
635 | ||
636 | static int tcm_loop_queue_data_in(struct se_cmd *se_cmd) | |
637 | { | |
638 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
639 | struct tcm_loop_cmd, tl_se_cmd); | |
640 | struct scsi_cmnd *sc = tl_cmd->sc; | |
641 | ||
6708bb27 | 642 | pr_debug("tcm_loop_queue_data_in() called for scsi_cmnd: %p" |
3703b2c5 NB |
643 | " cdb: 0x%02x\n", sc, sc->cmnd[0]); |
644 | ||
645 | sc->result = SAM_STAT_GOOD; | |
646 | set_host_byte(sc, DID_OK); | |
6cf3fa69 RD |
647 | if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || |
648 | (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) | |
649 | scsi_set_resid(sc, se_cmd->residual_count); | |
3703b2c5 NB |
650 | sc->scsi_done(sc); |
651 | return 0; | |
652 | } | |
653 | ||
654 | static int tcm_loop_queue_status(struct se_cmd *se_cmd) | |
655 | { | |
656 | struct tcm_loop_cmd *tl_cmd = container_of(se_cmd, | |
657 | struct tcm_loop_cmd, tl_se_cmd); | |
658 | struct scsi_cmnd *sc = tl_cmd->sc; | |
659 | ||
6708bb27 | 660 | pr_debug("tcm_loop_queue_status() called for scsi_cmnd: %p" |
3703b2c5 NB |
661 | " cdb: 0x%02x\n", sc, sc->cmnd[0]); |
662 | ||
663 | if (se_cmd->sense_buffer && | |
664 | ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || | |
665 | (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { | |
666 | ||
5951146d | 667 | memcpy(sc->sense_buffer, se_cmd->sense_buffer, |
3703b2c5 NB |
668 | SCSI_SENSE_BUFFERSIZE); |
669 | sc->result = SAM_STAT_CHECK_CONDITION; | |
670 | set_driver_byte(sc, DRIVER_SENSE); | |
671 | } else | |
672 | sc->result = se_cmd->scsi_status; | |
673 | ||
674 | set_host_byte(sc, DID_OK); | |
6cf3fa69 RD |
675 | if ((se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) || |
676 | (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT)) | |
677 | scsi_set_resid(sc, se_cmd->residual_count); | |
3703b2c5 NB |
678 | sc->scsi_done(sc); |
679 | return 0; | |
680 | } | |
681 | ||
b79fafac | 682 | static void tcm_loop_queue_tm_rsp(struct se_cmd *se_cmd) |
3703b2c5 NB |
683 | { |
684 | struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; | |
685 | struct tcm_loop_tmr *tl_tmr = se_tmr->fabric_tmr_ptr; | |
686 | /* | |
687 | * The SCSI EH thread will be sleeping on se_tmr->tl_tmr_wait, go ahead | |
688 | * and wake up the wait_queue_head_t in tcm_loop_device_reset() | |
689 | */ | |
690 | atomic_set(&tl_tmr->tmr_complete, 1); | |
691 | wake_up(&tl_tmr->tl_tmr_wait); | |
3703b2c5 NB |
692 | } |
693 | ||
131e6abc NB |
694 | static void tcm_loop_aborted_task(struct se_cmd *se_cmd) |
695 | { | |
696 | return; | |
697 | } | |
698 | ||
3703b2c5 NB |
699 | static char *tcm_loop_dump_proto_id(struct tcm_loop_hba *tl_hba) |
700 | { | |
701 | switch (tl_hba->tl_proto_id) { | |
702 | case SCSI_PROTOCOL_SAS: | |
703 | return "SAS"; | |
704 | case SCSI_PROTOCOL_FCP: | |
705 | return "FCP"; | |
706 | case SCSI_PROTOCOL_ISCSI: | |
707 | return "iSCSI"; | |
708 | default: | |
709 | break; | |
710 | } | |
711 | ||
712 | return "Unknown"; | |
713 | } | |
714 | ||
715 | /* Start items for tcm_loop_port_cit */ | |
716 | ||
717 | static int tcm_loop_port_link( | |
718 | struct se_portal_group *se_tpg, | |
719 | struct se_lun *lun) | |
720 | { | |
721 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
722 | struct tcm_loop_tpg, tl_se_tpg); | |
723 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
724 | ||
33940d09 | 725 | atomic_inc_mb(&tl_tpg->tl_tpg_port_count); |
3703b2c5 NB |
726 | /* |
727 | * Add Linux/SCSI struct scsi_device by HCTL | |
728 | */ | |
729 | scsi_add_device(tl_hba->sh, 0, tl_tpg->tl_tpgt, lun->unpacked_lun); | |
730 | ||
6708bb27 | 731 | pr_debug("TCM_Loop_ConfigFS: Port Link Successful\n"); |
3703b2c5 NB |
732 | return 0; |
733 | } | |
734 | ||
735 | static void tcm_loop_port_unlink( | |
736 | struct se_portal_group *se_tpg, | |
737 | struct se_lun *se_lun) | |
738 | { | |
739 | struct scsi_device *sd; | |
740 | struct tcm_loop_hba *tl_hba; | |
741 | struct tcm_loop_tpg *tl_tpg; | |
742 | ||
743 | tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, tl_se_tpg); | |
744 | tl_hba = tl_tpg->tl_hba; | |
745 | ||
746 | sd = scsi_device_lookup(tl_hba->sh, 0, tl_tpg->tl_tpgt, | |
747 | se_lun->unpacked_lun); | |
748 | if (!sd) { | |
6708bb27 | 749 | pr_err("Unable to locate struct scsi_device for %d:%d:" |
f2d30680 | 750 | "%llu\n", 0, tl_tpg->tl_tpgt, se_lun->unpacked_lun); |
3703b2c5 NB |
751 | return; |
752 | } | |
753 | /* | |
754 | * Remove Linux/SCSI struct scsi_device by HCTL | |
755 | */ | |
756 | scsi_remove_device(sd); | |
757 | scsi_device_put(sd); | |
758 | ||
33940d09 | 759 | atomic_dec_mb(&tl_tpg->tl_tpg_port_count); |
3703b2c5 | 760 | |
6708bb27 | 761 | pr_debug("TCM_Loop_ConfigFS: Port Unlink Successful\n"); |
3703b2c5 NB |
762 | } |
763 | ||
764 | /* End items for tcm_loop_port_cit */ | |
765 | ||
436f4a0a NB |
766 | static ssize_t tcm_loop_tpg_attrib_show_fabric_prot_type( |
767 | struct se_portal_group *se_tpg, | |
768 | char *page) | |
769 | { | |
770 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, | |
771 | tl_se_tpg); | |
772 | ||
773 | return sprintf(page, "%d\n", tl_tpg->tl_fabric_prot_type); | |
774 | } | |
775 | ||
776 | static ssize_t tcm_loop_tpg_attrib_store_fabric_prot_type( | |
777 | struct se_portal_group *se_tpg, | |
778 | const char *page, | |
779 | size_t count) | |
780 | { | |
781 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, struct tcm_loop_tpg, | |
782 | tl_se_tpg); | |
783 | unsigned long val; | |
784 | int ret = kstrtoul(page, 0, &val); | |
785 | ||
786 | if (ret) { | |
787 | pr_err("kstrtoul() returned %d for fabric_prot_type\n", ret); | |
788 | return ret; | |
789 | } | |
790 | if (val != 0 && val != 1 && val != 3) { | |
791 | pr_err("Invalid qla2xxx fabric_prot_type: %lu\n", val); | |
792 | return -EINVAL; | |
793 | } | |
794 | tl_tpg->tl_fabric_prot_type = val; | |
795 | ||
796 | return count; | |
797 | } | |
798 | ||
799 | TF_TPG_ATTRIB_ATTR(tcm_loop, fabric_prot_type, S_IRUGO | S_IWUSR); | |
800 | ||
801 | static struct configfs_attribute *tcm_loop_tpg_attrib_attrs[] = { | |
802 | &tcm_loop_tpg_attrib_fabric_prot_type.attr, | |
803 | NULL, | |
804 | }; | |
805 | ||
3703b2c5 NB |
806 | /* Start items for tcm_loop_nexus_cit */ |
807 | ||
808 | static int tcm_loop_make_nexus( | |
809 | struct tcm_loop_tpg *tl_tpg, | |
810 | const char *name) | |
811 | { | |
812 | struct se_portal_group *se_tpg; | |
813 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
814 | struct tcm_loop_nexus *tl_nexus; | |
552523dc | 815 | int ret = -ENOMEM; |
3703b2c5 | 816 | |
506787a2 HR |
817 | if (tl_tpg->tl_nexus) { |
818 | pr_debug("tl_tpg->tl_nexus already exists\n"); | |
3703b2c5 NB |
819 | return -EEXIST; |
820 | } | |
821 | se_tpg = &tl_tpg->tl_se_tpg; | |
822 | ||
823 | tl_nexus = kzalloc(sizeof(struct tcm_loop_nexus), GFP_KERNEL); | |
824 | if (!tl_nexus) { | |
6708bb27 | 825 | pr_err("Unable to allocate struct tcm_loop_nexus\n"); |
3703b2c5 NB |
826 | return -ENOMEM; |
827 | } | |
828 | /* | |
829 | * Initialize the struct se_session pointer | |
830 | */ | |
436f4a0a NB |
831 | tl_nexus->se_sess = transport_init_session( |
832 | TARGET_PROT_DIN_PASS | TARGET_PROT_DOUT_PASS); | |
552523dc DC |
833 | if (IS_ERR(tl_nexus->se_sess)) { |
834 | ret = PTR_ERR(tl_nexus->se_sess); | |
3703b2c5 | 835 | goto out; |
552523dc | 836 | } |
3703b2c5 NB |
837 | /* |
838 | * Since we are running in 'demo mode' this call with generate a | |
839 | * struct se_node_acl for the tcm_loop struct se_portal_group with the SCSI | |
840 | * Initiator port name of the passed configfs group 'name'. | |
841 | */ | |
842 | tl_nexus->se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
843 | se_tpg, (unsigned char *)name); | |
844 | if (!tl_nexus->se_sess->se_node_acl) { | |
845 | transport_free_session(tl_nexus->se_sess); | |
846 | goto out; | |
847 | } | |
2f450cc1 BVA |
848 | /* Now, register the SAS I_T Nexus as active. */ |
849 | transport_register_session(se_tpg, tl_nexus->se_sess->se_node_acl, | |
5951146d | 850 | tl_nexus->se_sess, tl_nexus); |
506787a2 | 851 | tl_tpg->tl_nexus = tl_nexus; |
6708bb27 | 852 | pr_debug("TCM_Loop_ConfigFS: Established I_T Nexus to emulated" |
3703b2c5 NB |
853 | " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tl_hba), |
854 | name); | |
855 | return 0; | |
856 | ||
857 | out: | |
858 | kfree(tl_nexus); | |
552523dc | 859 | return ret; |
3703b2c5 NB |
860 | } |
861 | ||
862 | static int tcm_loop_drop_nexus( | |
863 | struct tcm_loop_tpg *tpg) | |
864 | { | |
865 | struct se_session *se_sess; | |
866 | struct tcm_loop_nexus *tl_nexus; | |
3703b2c5 | 867 | |
506787a2 | 868 | tl_nexus = tpg->tl_nexus; |
3703b2c5 NB |
869 | if (!tl_nexus) |
870 | return -ENODEV; | |
871 | ||
872 | se_sess = tl_nexus->se_sess; | |
873 | if (!se_sess) | |
874 | return -ENODEV; | |
875 | ||
876 | if (atomic_read(&tpg->tl_tpg_port_count)) { | |
6708bb27 | 877 | pr_err("Unable to remove TCM_Loop I_T Nexus with" |
3703b2c5 NB |
878 | " active TPG port count: %d\n", |
879 | atomic_read(&tpg->tl_tpg_port_count)); | |
880 | return -EPERM; | |
881 | } | |
882 | ||
6708bb27 | 883 | pr_debug("TCM_Loop_ConfigFS: Removing I_T Nexus to emulated" |
506787a2 | 884 | " %s Initiator Port: %s\n", tcm_loop_dump_proto_id(tpg->tl_hba), |
3703b2c5 NB |
885 | tl_nexus->se_sess->se_node_acl->initiatorname); |
886 | /* | |
887 | * Release the SCSI I_T Nexus to the emulated SAS Target Port | |
888 | */ | |
889 | transport_deregister_session(tl_nexus->se_sess); | |
506787a2 | 890 | tpg->tl_nexus = NULL; |
3703b2c5 NB |
891 | kfree(tl_nexus); |
892 | return 0; | |
893 | } | |
894 | ||
895 | /* End items for tcm_loop_nexus_cit */ | |
896 | ||
897 | static ssize_t tcm_loop_tpg_show_nexus( | |
898 | struct se_portal_group *se_tpg, | |
899 | char *page) | |
900 | { | |
901 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
902 | struct tcm_loop_tpg, tl_se_tpg); | |
903 | struct tcm_loop_nexus *tl_nexus; | |
904 | ssize_t ret; | |
905 | ||
506787a2 | 906 | tl_nexus = tl_tpg->tl_nexus; |
3703b2c5 NB |
907 | if (!tl_nexus) |
908 | return -ENODEV; | |
909 | ||
910 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
911 | tl_nexus->se_sess->se_node_acl->initiatorname); | |
912 | ||
913 | return ret; | |
914 | } | |
915 | ||
916 | static ssize_t tcm_loop_tpg_store_nexus( | |
917 | struct se_portal_group *se_tpg, | |
918 | const char *page, | |
919 | size_t count) | |
920 | { | |
921 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
922 | struct tcm_loop_tpg, tl_se_tpg); | |
923 | struct tcm_loop_hba *tl_hba = tl_tpg->tl_hba; | |
924 | unsigned char i_port[TL_WWN_ADDR_LEN], *ptr, *port_ptr; | |
925 | int ret; | |
926 | /* | |
927 | * Shutdown the active I_T nexus if 'NULL' is passed.. | |
928 | */ | |
929 | if (!strncmp(page, "NULL", 4)) { | |
930 | ret = tcm_loop_drop_nexus(tl_tpg); | |
931 | return (!ret) ? count : ret; | |
932 | } | |
933 | /* | |
934 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
935 | * the fabric protocol_id set in tcm_loop_make_scsi_hba(), and call | |
936 | * tcm_loop_make_nexus() | |
937 | */ | |
60d645a4 | 938 | if (strlen(page) >= TL_WWN_ADDR_LEN) { |
6708bb27 | 939 | pr_err("Emulated NAA Sas Address: %s, exceeds" |
3703b2c5 NB |
940 | " max: %d\n", page, TL_WWN_ADDR_LEN); |
941 | return -EINVAL; | |
942 | } | |
943 | snprintf(&i_port[0], TL_WWN_ADDR_LEN, "%s", page); | |
944 | ||
945 | ptr = strstr(i_port, "naa."); | |
946 | if (ptr) { | |
947 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_SAS) { | |
6708bb27 | 948 | pr_err("Passed SAS Initiator Port %s does not" |
3703b2c5 NB |
949 | " match target port protoid: %s\n", i_port, |
950 | tcm_loop_dump_proto_id(tl_hba)); | |
951 | return -EINVAL; | |
952 | } | |
953 | port_ptr = &i_port[0]; | |
954 | goto check_newline; | |
955 | } | |
956 | ptr = strstr(i_port, "fc."); | |
957 | if (ptr) { | |
958 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_FCP) { | |
6708bb27 | 959 | pr_err("Passed FCP Initiator Port %s does not" |
3703b2c5 NB |
960 | " match target port protoid: %s\n", i_port, |
961 | tcm_loop_dump_proto_id(tl_hba)); | |
962 | return -EINVAL; | |
963 | } | |
964 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
965 | goto check_newline; | |
966 | } | |
967 | ptr = strstr(i_port, "iqn."); | |
968 | if (ptr) { | |
969 | if (tl_hba->tl_proto_id != SCSI_PROTOCOL_ISCSI) { | |
6708bb27 | 970 | pr_err("Passed iSCSI Initiator Port %s does not" |
3703b2c5 NB |
971 | " match target port protoid: %s\n", i_port, |
972 | tcm_loop_dump_proto_id(tl_hba)); | |
973 | return -EINVAL; | |
974 | } | |
975 | port_ptr = &i_port[0]; | |
976 | goto check_newline; | |
977 | } | |
6708bb27 | 978 | pr_err("Unable to locate prefix for emulated Initiator Port:" |
3703b2c5 NB |
979 | " %s\n", i_port); |
980 | return -EINVAL; | |
981 | /* | |
982 | * Clear any trailing newline for the NAA WWN | |
983 | */ | |
984 | check_newline: | |
985 | if (i_port[strlen(i_port)-1] == '\n') | |
986 | i_port[strlen(i_port)-1] = '\0'; | |
987 | ||
988 | ret = tcm_loop_make_nexus(tl_tpg, port_ptr); | |
989 | if (ret < 0) | |
990 | return ret; | |
991 | ||
992 | return count; | |
993 | } | |
994 | ||
995 | TF_TPG_BASE_ATTR(tcm_loop, nexus, S_IRUGO | S_IWUSR); | |
996 | ||
fb2b2844 HR |
997 | static ssize_t tcm_loop_tpg_show_transport_status( |
998 | struct se_portal_group *se_tpg, | |
999 | char *page) | |
1000 | { | |
1001 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1002 | struct tcm_loop_tpg, tl_se_tpg); | |
1003 | const char *status = NULL; | |
1004 | ssize_t ret = -EINVAL; | |
1005 | ||
1006 | switch (tl_tpg->tl_transport_status) { | |
1007 | case TCM_TRANSPORT_ONLINE: | |
1008 | status = "online"; | |
1009 | break; | |
1010 | case TCM_TRANSPORT_OFFLINE: | |
1011 | status = "offline"; | |
1012 | break; | |
1013 | default: | |
1014 | break; | |
1015 | } | |
1016 | ||
1017 | if (status) | |
1018 | ret = snprintf(page, PAGE_SIZE, "%s\n", status); | |
1019 | ||
1020 | return ret; | |
1021 | } | |
1022 | ||
1023 | static ssize_t tcm_loop_tpg_store_transport_status( | |
1024 | struct se_portal_group *se_tpg, | |
1025 | const char *page, | |
1026 | size_t count) | |
1027 | { | |
1028 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1029 | struct tcm_loop_tpg, tl_se_tpg); | |
1030 | ||
1031 | if (!strncmp(page, "online", 6)) { | |
1032 | tl_tpg->tl_transport_status = TCM_TRANSPORT_ONLINE; | |
1033 | return count; | |
1034 | } | |
1035 | if (!strncmp(page, "offline", 7)) { | |
1036 | tl_tpg->tl_transport_status = TCM_TRANSPORT_OFFLINE; | |
1037 | return count; | |
1038 | } | |
1039 | return -EINVAL; | |
1040 | } | |
1041 | ||
1042 | TF_TPG_BASE_ATTR(tcm_loop, transport_status, S_IRUGO | S_IWUSR); | |
1043 | ||
3703b2c5 NB |
1044 | static struct configfs_attribute *tcm_loop_tpg_attrs[] = { |
1045 | &tcm_loop_tpg_nexus.attr, | |
fb2b2844 | 1046 | &tcm_loop_tpg_transport_status.attr, |
3703b2c5 NB |
1047 | NULL, |
1048 | }; | |
1049 | ||
1050 | /* Start items for tcm_loop_naa_cit */ | |
1051 | ||
f0a6c693 | 1052 | static struct se_portal_group *tcm_loop_make_naa_tpg( |
3703b2c5 NB |
1053 | struct se_wwn *wwn, |
1054 | struct config_group *group, | |
1055 | const char *name) | |
1056 | { | |
1057 | struct tcm_loop_hba *tl_hba = container_of(wwn, | |
1058 | struct tcm_loop_hba, tl_hba_wwn); | |
1059 | struct tcm_loop_tpg *tl_tpg; | |
3703b2c5 | 1060 | int ret; |
2e1cd90d | 1061 | unsigned long tpgt; |
3703b2c5 | 1062 | |
2e1cd90d | 1063 | if (strstr(name, "tpgt_") != name) { |
6708bb27 | 1064 | pr_err("Unable to locate \"tpgt_#\" directory" |
3703b2c5 NB |
1065 | " group\n"); |
1066 | return ERR_PTR(-EINVAL); | |
1067 | } | |
2e1cd90d ML |
1068 | if (kstrtoul(name+5, 10, &tpgt)) |
1069 | return ERR_PTR(-EINVAL); | |
3703b2c5 | 1070 | |
12f09ccb | 1071 | if (tpgt >= TL_TPGS_PER_HBA) { |
2e1cd90d | 1072 | pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA:" |
3703b2c5 NB |
1073 | " %u\n", tpgt, TL_TPGS_PER_HBA); |
1074 | return ERR_PTR(-EINVAL); | |
1075 | } | |
1076 | tl_tpg = &tl_hba->tl_hba_tpgs[tpgt]; | |
1077 | tl_tpg->tl_hba = tl_hba; | |
1078 | tl_tpg->tl_tpgt = tpgt; | |
1079 | /* | |
1080 | * Register the tl_tpg as a emulated SAS TCM Target Endpoint | |
1081 | */ | |
bc0c94b1 | 1082 | ret = core_tpg_register(wwn, &tl_tpg->tl_se_tpg, tl_hba->tl_proto_id); |
3703b2c5 NB |
1083 | if (ret < 0) |
1084 | return ERR_PTR(-ENOMEM); | |
1085 | ||
6708bb27 | 1086 | pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s" |
2e1cd90d | 1087 | " Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba), |
3703b2c5 NB |
1088 | config_item_name(&wwn->wwn_group.cg_item), tpgt); |
1089 | ||
1090 | return &tl_tpg->tl_se_tpg; | |
1091 | } | |
1092 | ||
f0a6c693 | 1093 | static void tcm_loop_drop_naa_tpg( |
3703b2c5 NB |
1094 | struct se_portal_group *se_tpg) |
1095 | { | |
1096 | struct se_wwn *wwn = se_tpg->se_tpg_wwn; | |
1097 | struct tcm_loop_tpg *tl_tpg = container_of(se_tpg, | |
1098 | struct tcm_loop_tpg, tl_se_tpg); | |
1099 | struct tcm_loop_hba *tl_hba; | |
1100 | unsigned short tpgt; | |
1101 | ||
1102 | tl_hba = tl_tpg->tl_hba; | |
1103 | tpgt = tl_tpg->tl_tpgt; | |
1104 | /* | |
1105 | * Release the I_T Nexus for the Virtual SAS link if present | |
1106 | */ | |
1107 | tcm_loop_drop_nexus(tl_tpg); | |
1108 | /* | |
1109 | * Deregister the tl_tpg as a emulated SAS TCM Target Endpoint | |
1110 | */ | |
1111 | core_tpg_deregister(se_tpg); | |
1112 | ||
0a020436 NB |
1113 | tl_tpg->tl_hba = NULL; |
1114 | tl_tpg->tl_tpgt = 0; | |
1115 | ||
6708bb27 | 1116 | pr_debug("TCM_Loop_ConfigFS: Deallocated Emulated %s" |
3703b2c5 NB |
1117 | " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba), |
1118 | config_item_name(&wwn->wwn_group.cg_item), tpgt); | |
1119 | } | |
1120 | ||
1121 | /* End items for tcm_loop_naa_cit */ | |
1122 | ||
1123 | /* Start items for tcm_loop_cit */ | |
1124 | ||
f0a6c693 | 1125 | static struct se_wwn *tcm_loop_make_scsi_hba( |
3703b2c5 NB |
1126 | struct target_fabric_configfs *tf, |
1127 | struct config_group *group, | |
1128 | const char *name) | |
1129 | { | |
1130 | struct tcm_loop_hba *tl_hba; | |
1131 | struct Scsi_Host *sh; | |
1132 | char *ptr; | |
1133 | int ret, off = 0; | |
1134 | ||
1135 | tl_hba = kzalloc(sizeof(struct tcm_loop_hba), GFP_KERNEL); | |
1136 | if (!tl_hba) { | |
6708bb27 | 1137 | pr_err("Unable to allocate struct tcm_loop_hba\n"); |
3703b2c5 NB |
1138 | return ERR_PTR(-ENOMEM); |
1139 | } | |
1140 | /* | |
1141 | * Determine the emulated Protocol Identifier and Target Port Name | |
1142 | * based on the incoming configfs directory name. | |
1143 | */ | |
1144 | ptr = strstr(name, "naa."); | |
1145 | if (ptr) { | |
1146 | tl_hba->tl_proto_id = SCSI_PROTOCOL_SAS; | |
1147 | goto check_len; | |
1148 | } | |
1149 | ptr = strstr(name, "fc."); | |
1150 | if (ptr) { | |
1151 | tl_hba->tl_proto_id = SCSI_PROTOCOL_FCP; | |
1152 | off = 3; /* Skip over "fc." */ | |
1153 | goto check_len; | |
1154 | } | |
1155 | ptr = strstr(name, "iqn."); | |
a57b5d36 | 1156 | if (!ptr) { |
6708bb27 | 1157 | pr_err("Unable to locate prefix for emulated Target " |
a57b5d36 JJ |
1158 | "Port: %s\n", name); |
1159 | ret = -EINVAL; | |
1160 | goto out; | |
3703b2c5 | 1161 | } |
a57b5d36 | 1162 | tl_hba->tl_proto_id = SCSI_PROTOCOL_ISCSI; |
3703b2c5 NB |
1163 | |
1164 | check_len: | |
60d645a4 | 1165 | if (strlen(name) >= TL_WWN_ADDR_LEN) { |
6708bb27 | 1166 | pr_err("Emulated NAA %s Address: %s, exceeds" |
3703b2c5 NB |
1167 | " max: %d\n", name, tcm_loop_dump_proto_id(tl_hba), |
1168 | TL_WWN_ADDR_LEN); | |
a57b5d36 JJ |
1169 | ret = -EINVAL; |
1170 | goto out; | |
3703b2c5 NB |
1171 | } |
1172 | snprintf(&tl_hba->tl_wwn_address[0], TL_WWN_ADDR_LEN, "%s", &name[off]); | |
1173 | ||
1174 | /* | |
1175 | * Call device_register(tl_hba->dev) to register the emulated | |
1176 | * Linux/SCSI LLD of type struct Scsi_Host at tl_hba->sh after | |
1177 | * device_register() callbacks in tcm_loop_driver_probe() | |
1178 | */ | |
1179 | ret = tcm_loop_setup_hba_bus(tl_hba, tcm_loop_hba_no_cnt); | |
1180 | if (ret) | |
1181 | goto out; | |
1182 | ||
1183 | sh = tl_hba->sh; | |
1184 | tcm_loop_hba_no_cnt++; | |
6708bb27 | 1185 | pr_debug("TCM_Loop_ConfigFS: Allocated emulated Target" |
3703b2c5 NB |
1186 | " %s Address: %s at Linux/SCSI Host ID: %d\n", |
1187 | tcm_loop_dump_proto_id(tl_hba), name, sh->host_no); | |
1188 | ||
1189 | return &tl_hba->tl_hba_wwn; | |
1190 | out: | |
1191 | kfree(tl_hba); | |
1192 | return ERR_PTR(ret); | |
1193 | } | |
1194 | ||
f0a6c693 | 1195 | static void tcm_loop_drop_scsi_hba( |
3703b2c5 NB |
1196 | struct se_wwn *wwn) |
1197 | { | |
1198 | struct tcm_loop_hba *tl_hba = container_of(wwn, | |
1199 | struct tcm_loop_hba, tl_hba_wwn); | |
6297b07c NB |
1200 | |
1201 | pr_debug("TCM_Loop_ConfigFS: Deallocating emulated Target" | |
1202 | " SAS Address: %s at Linux/SCSI Host ID: %d\n", | |
1203 | tl_hba->tl_wwn_address, tl_hba->sh->host_no); | |
3703b2c5 NB |
1204 | /* |
1205 | * Call device_unregister() on the original tl_hba->dev. | |
1206 | * tcm_loop_fabric_scsi.c:tcm_loop_release_adapter() will | |
1207 | * release *tl_hba; | |
1208 | */ | |
1209 | device_unregister(&tl_hba->dev); | |
3703b2c5 NB |
1210 | } |
1211 | ||
1212 | /* Start items for tcm_loop_cit */ | |
1213 | static ssize_t tcm_loop_wwn_show_attr_version( | |
1214 | struct target_fabric_configfs *tf, | |
1215 | char *page) | |
1216 | { | |
1217 | return sprintf(page, "TCM Loopback Fabric module %s\n", TCM_LOOP_VERSION); | |
1218 | } | |
1219 | ||
1220 | TF_WWN_ATTR_RO(tcm_loop, version); | |
1221 | ||
1222 | static struct configfs_attribute *tcm_loop_wwn_attrs[] = { | |
1223 | &tcm_loop_wwn_version.attr, | |
1224 | NULL, | |
1225 | }; | |
1226 | ||
1227 | /* End items for tcm_loop_cit */ | |
1228 | ||
9ac8928e CH |
1229 | static const struct target_core_fabric_ops loop_ops = { |
1230 | .module = THIS_MODULE, | |
1231 | .name = "loopback", | |
1232 | .get_fabric_name = tcm_loop_get_fabric_name, | |
9ac8928e CH |
1233 | .tpg_get_wwn = tcm_loop_get_endpoint_wwn, |
1234 | .tpg_get_tag = tcm_loop_get_tag, | |
9ac8928e CH |
1235 | .tpg_check_demo_mode = tcm_loop_check_demo_mode, |
1236 | .tpg_check_demo_mode_cache = tcm_loop_check_demo_mode_cache, | |
1237 | .tpg_check_demo_mode_write_protect = | |
1238 | tcm_loop_check_demo_mode_write_protect, | |
1239 | .tpg_check_prod_mode_write_protect = | |
1240 | tcm_loop_check_prod_mode_write_protect, | |
1241 | .tpg_check_prot_fabric_only = tcm_loop_check_prot_fabric_only, | |
9ac8928e CH |
1242 | .tpg_get_inst_index = tcm_loop_get_inst_index, |
1243 | .check_stop_free = tcm_loop_check_stop_free, | |
1244 | .release_cmd = tcm_loop_release_cmd, | |
1245 | .shutdown_session = tcm_loop_shutdown_session, | |
1246 | .close_session = tcm_loop_close_session, | |
1247 | .sess_get_index = tcm_loop_sess_get_index, | |
1248 | .write_pending = tcm_loop_write_pending, | |
1249 | .write_pending_status = tcm_loop_write_pending_status, | |
1250 | .set_default_node_attributes = tcm_loop_set_default_node_attributes, | |
9ac8928e CH |
1251 | .get_cmd_state = tcm_loop_get_cmd_state, |
1252 | .queue_data_in = tcm_loop_queue_data_in, | |
1253 | .queue_status = tcm_loop_queue_status, | |
1254 | .queue_tm_rsp = tcm_loop_queue_tm_rsp, | |
1255 | .aborted_task = tcm_loop_aborted_task, | |
1256 | .fabric_make_wwn = tcm_loop_make_scsi_hba, | |
1257 | .fabric_drop_wwn = tcm_loop_drop_scsi_hba, | |
1258 | .fabric_make_tpg = tcm_loop_make_naa_tpg, | |
1259 | .fabric_drop_tpg = tcm_loop_drop_naa_tpg, | |
1260 | .fabric_post_link = tcm_loop_port_link, | |
1261 | .fabric_pre_unlink = tcm_loop_port_unlink, | |
1262 | .tfc_wwn_attrs = tcm_loop_wwn_attrs, | |
1263 | .tfc_tpg_base_attrs = tcm_loop_tpg_attrs, | |
1264 | .tfc_tpg_attrib_attrs = tcm_loop_tpg_attrib_attrs, | |
1265 | }; | |
3703b2c5 NB |
1266 | |
1267 | static int __init tcm_loop_fabric_init(void) | |
1268 | { | |
afe2cb7f CH |
1269 | int ret = -ENOMEM; |
1270 | ||
1271 | tcm_loop_workqueue = alloc_workqueue("tcm_loop", 0, 0); | |
1272 | if (!tcm_loop_workqueue) | |
1273 | goto out; | |
3703b2c5 NB |
1274 | |
1275 | tcm_loop_cmd_cache = kmem_cache_create("tcm_loop_cmd_cache", | |
1276 | sizeof(struct tcm_loop_cmd), | |
1277 | __alignof__(struct tcm_loop_cmd), | |
1278 | 0, NULL); | |
1279 | if (!tcm_loop_cmd_cache) { | |
6708bb27 | 1280 | pr_debug("kmem_cache_create() for" |
3703b2c5 | 1281 | " tcm_loop_cmd_cache failed\n"); |
afe2cb7f | 1282 | goto out_destroy_workqueue; |
3703b2c5 NB |
1283 | } |
1284 | ||
1285 | ret = tcm_loop_alloc_core_bus(); | |
1286 | if (ret) | |
afe2cb7f | 1287 | goto out_destroy_cache; |
3703b2c5 | 1288 | |
9ac8928e | 1289 | ret = target_register_template(&loop_ops); |
afe2cb7f CH |
1290 | if (ret) |
1291 | goto out_release_core_bus; | |
3703b2c5 NB |
1292 | |
1293 | return 0; | |
afe2cb7f CH |
1294 | |
1295 | out_release_core_bus: | |
1296 | tcm_loop_release_core_bus(); | |
1297 | out_destroy_cache: | |
1298 | kmem_cache_destroy(tcm_loop_cmd_cache); | |
1299 | out_destroy_workqueue: | |
1300 | destroy_workqueue(tcm_loop_workqueue); | |
1301 | out: | |
1302 | return ret; | |
3703b2c5 NB |
1303 | } |
1304 | ||
1305 | static void __exit tcm_loop_fabric_exit(void) | |
1306 | { | |
9ac8928e | 1307 | target_unregister_template(&loop_ops); |
3703b2c5 NB |
1308 | tcm_loop_release_core_bus(); |
1309 | kmem_cache_destroy(tcm_loop_cmd_cache); | |
afe2cb7f | 1310 | destroy_workqueue(tcm_loop_workqueue); |
3703b2c5 NB |
1311 | } |
1312 | ||
1313 | MODULE_DESCRIPTION("TCM loopback virtual Linux/SCSI fabric module"); | |
1314 | MODULE_AUTHOR("Nicholas A. Bellinger <nab@risingtidesystems.com>"); | |
1315 | MODULE_LICENSE("GPL"); | |
1316 | module_init(tcm_loop_fabric_init); | |
1317 | module_exit(tcm_loop_fabric_exit); |