1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * NVMe over Fabrics common host code.
4 * Copyright (c) 2015-2016 HGST, a Western Digital Company.
5 */
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7 #include <linux/init.h>
8 #include <linux/miscdevice.h>
9 #include <linux/module.h>
10 #include <linux/mutex.h>
11 #include <linux/parser.h>
12 #include <linux/seq_file.h>
13 #include "nvme.h"
14 #include "fabrics.h"
15
16 static LIST_HEAD(nvmf_transports);
17 static DECLARE_RWSEM(nvmf_transports_rwsem);
18
19 static LIST_HEAD(nvmf_hosts);
20 static DEFINE_MUTEX(nvmf_hosts_mutex);
21
22 static struct nvmf_host *nvmf_default_host;
23
__nvmf_host_find(const char * hostnqn)24 static struct nvmf_host *__nvmf_host_find(const char *hostnqn)
25 {
26 struct nvmf_host *host;
27
28 list_for_each_entry(host, &nvmf_hosts, list) {
29 if (!strcmp(host->nqn, hostnqn))
30 return host;
31 }
32
33 return NULL;
34 }
35
nvmf_host_add(const char * hostnqn)36 static struct nvmf_host *nvmf_host_add(const char *hostnqn)
37 {
38 struct nvmf_host *host;
39
40 mutex_lock(&nvmf_hosts_mutex);
41 host = __nvmf_host_find(hostnqn);
42 if (host) {
43 kref_get(&host->ref);
44 goto out_unlock;
45 }
46
47 host = kmalloc(sizeof(*host), GFP_KERNEL);
48 if (!host)
49 goto out_unlock;
50
51 kref_init(&host->ref);
52 strscpy(host->nqn, hostnqn, NVMF_NQN_SIZE);
53
54 list_add_tail(&host->list, &nvmf_hosts);
55 out_unlock:
56 mutex_unlock(&nvmf_hosts_mutex);
57 return host;
58 }
59
nvmf_host_default(void)60 static struct nvmf_host *nvmf_host_default(void)
61 {
62 struct nvmf_host *host;
63
64 host = kmalloc(sizeof(*host), GFP_KERNEL);
65 if (!host)
66 return NULL;
67
68 kref_init(&host->ref);
69 uuid_gen(&host->id);
70 snprintf(host->nqn, NVMF_NQN_SIZE,
71 "nqn.2014-08.org.nvmexpress:uuid:%pUb", &host->id);
72
73 mutex_lock(&nvmf_hosts_mutex);
74 list_add_tail(&host->list, &nvmf_hosts);
75 mutex_unlock(&nvmf_hosts_mutex);
76
77 return host;
78 }
79
nvmf_host_destroy(struct kref * ref)80 static void nvmf_host_destroy(struct kref *ref)
81 {
82 struct nvmf_host *host = container_of(ref, struct nvmf_host, ref);
83
84 mutex_lock(&nvmf_hosts_mutex);
85 list_del(&host->list);
86 mutex_unlock(&nvmf_hosts_mutex);
87
88 kfree(host);
89 }
90
nvmf_host_put(struct nvmf_host * host)91 static void nvmf_host_put(struct nvmf_host *host)
92 {
93 if (host)
94 kref_put(&host->ref, nvmf_host_destroy);
95 }
96
97 /**
98 * nvmf_get_address() - Get address/port
99 * @ctrl: Host NVMe controller instance which we got the address
100 * @buf: OUTPUT parameter that will contain the address/port
101 * @size: buffer size
102 */
nvmf_get_address(struct nvme_ctrl * ctrl,char * buf,int size)103 int nvmf_get_address(struct nvme_ctrl *ctrl, char *buf, int size)
104 {
105 int len = 0;
106
107 if (ctrl->opts->mask & NVMF_OPT_TRADDR)
108 len += scnprintf(buf, size, "traddr=%s", ctrl->opts->traddr);
109 if (ctrl->opts->mask & NVMF_OPT_TRSVCID)
110 len += scnprintf(buf + len, size - len, "%strsvcid=%s",
111 (len) ? "," : "", ctrl->opts->trsvcid);
112 if (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)
113 len += scnprintf(buf + len, size - len, "%shost_traddr=%s",
114 (len) ? "," : "", ctrl->opts->host_traddr);
115 if (ctrl->opts->mask & NVMF_OPT_HOST_IFACE)
116 len += scnprintf(buf + len, size - len, "%shost_iface=%s",
117 (len) ? "," : "", ctrl->opts->host_iface);
118 len += scnprintf(buf + len, size - len, "\n");
119
120 return len;
121 }
122 EXPORT_SYMBOL_GPL(nvmf_get_address);
123
124 /**
125 * nvmf_reg_read32() - NVMe Fabrics "Property Get" API function.
126 * @ctrl: Host NVMe controller instance maintaining the admin
127 * queue used to submit the property read command to
128 * the allocated NVMe controller resource on the target system.
129 * @off: Starting offset value of the targeted property
130 * register (see the fabrics section of the NVMe standard).
131 * @val: OUTPUT parameter that will contain the value of
132 * the property after a successful read.
133 *
134 * Used by the host system to retrieve a 32-bit capsule property value
135 * from an NVMe controller on the target system.
136 *
137 * ("Capsule property" is an "PCIe register concept" applied to the
138 * NVMe fabrics space.)
139 *
140 * Return:
141 * 0: successful read
142 * > 0: NVMe error status code
143 * < 0: Linux errno error code
144 */
nvmf_reg_read32(struct nvme_ctrl * ctrl,u32 off,u32 * val)145 int nvmf_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val)
146 {
147 struct nvme_command cmd = { };
148 union nvme_result res;
149 int ret;
150
151 cmd.prop_get.opcode = nvme_fabrics_command;
152 cmd.prop_get.fctype = nvme_fabrics_type_property_get;
153 cmd.prop_get.offset = cpu_to_le32(off);
154
155 ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, &res, NULL, 0,
156 NVME_QID_ANY, 0, 0);
157
158 if (ret >= 0)
159 *val = le64_to_cpu(res.u64);
160 if (unlikely(ret != 0))
161 dev_err(ctrl->device,
162 "Property Get error: %d, offset %#x\n",
163 ret > 0 ? ret & ~NVME_SC_DNR : ret, off);
164
165 return ret;
166 }
167 EXPORT_SYMBOL_GPL(nvmf_reg_read32);
168
169 /**
170 * nvmf_reg_read64() - NVMe Fabrics "Property Get" API function.
171 * @ctrl: Host NVMe controller instance maintaining the admin
172 * queue used to submit the property read command to
173 * the allocated controller resource on the target system.
174 * @off: Starting offset value of the targeted property
175 * register (see the fabrics section of the NVMe standard).
176 * @val: OUTPUT parameter that will contain the value of
177 * the property after a successful read.
178 *
179 * Used by the host system to retrieve a 64-bit capsule property value
180 * from an NVMe controller on the target system.
181 *
182 * ("Capsule property" is an "PCIe register concept" applied to the
183 * NVMe fabrics space.)
184 *
185 * Return:
186 * 0: successful read
187 * > 0: NVMe error status code
188 * < 0: Linux errno error code
189 */
nvmf_reg_read64(struct nvme_ctrl * ctrl,u32 off,u64 * val)190 int nvmf_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val)
191 {
192 struct nvme_command cmd = { };
193 union nvme_result res;
194 int ret;
195
196 cmd.prop_get.opcode = nvme_fabrics_command;
197 cmd.prop_get.fctype = nvme_fabrics_type_property_get;
198 cmd.prop_get.attrib = 1;
199 cmd.prop_get.offset = cpu_to_le32(off);
200
201 ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, &res, NULL, 0,
202 NVME_QID_ANY, 0, 0);
203
204 if (ret >= 0)
205 *val = le64_to_cpu(res.u64);
206 if (unlikely(ret != 0))
207 dev_err(ctrl->device,
208 "Property Get error: %d, offset %#x\n",
209 ret > 0 ? ret & ~NVME_SC_DNR : ret, off);
210 return ret;
211 }
212 EXPORT_SYMBOL_GPL(nvmf_reg_read64);
213
214 /**
215 * nvmf_reg_write32() - NVMe Fabrics "Property Write" API function.
216 * @ctrl: Host NVMe controller instance maintaining the admin
217 * queue used to submit the property read command to
218 * the allocated NVMe controller resource on the target system.
219 * @off: Starting offset value of the targeted property
220 * register (see the fabrics section of the NVMe standard).
221 * @val: Input parameter that contains the value to be
222 * written to the property.
223 *
224 * Used by the NVMe host system to write a 32-bit capsule property value
225 * to an NVMe controller on the target system.
226 *
227 * ("Capsule property" is an "PCIe register concept" applied to the
228 * NVMe fabrics space.)
229 *
230 * Return:
231 * 0: successful write
232 * > 0: NVMe error status code
233 * < 0: Linux errno error code
234 */
nvmf_reg_write32(struct nvme_ctrl * ctrl,u32 off,u32 val)235 int nvmf_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val)
236 {
237 struct nvme_command cmd = { };
238 int ret;
239
240 cmd.prop_set.opcode = nvme_fabrics_command;
241 cmd.prop_set.fctype = nvme_fabrics_type_property_set;
242 cmd.prop_set.attrib = 0;
243 cmd.prop_set.offset = cpu_to_le32(off);
244 cmd.prop_set.value = cpu_to_le64(val);
245
246 ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, NULL, NULL, 0,
247 NVME_QID_ANY, 0, 0);
248 if (unlikely(ret))
249 dev_err(ctrl->device,
250 "Property Set error: %d, offset %#x\n",
251 ret > 0 ? ret & ~NVME_SC_DNR : ret, off);
252 return ret;
253 }
254 EXPORT_SYMBOL_GPL(nvmf_reg_write32);
255
256 /**
257 * nvmf_log_connect_error() - Error-parsing-diagnostic print out function for
258 * connect() errors.
259 * @ctrl: The specific /dev/nvmeX device that had the error.
260 * @errval: Error code to be decoded in a more human-friendly
261 * printout.
262 * @offset: For use with the NVMe error code
263 * NVME_SC_CONNECT_INVALID_PARAM.
264 * @cmd: This is the SQE portion of a submission capsule.
265 * @data: This is the "Data" portion of a submission capsule.
266 */
nvmf_log_connect_error(struct nvme_ctrl * ctrl,int errval,int offset,struct nvme_command * cmd,struct nvmf_connect_data * data)267 static void nvmf_log_connect_error(struct nvme_ctrl *ctrl,
268 int errval, int offset, struct nvme_command *cmd,
269 struct nvmf_connect_data *data)
270 {
271 int err_sctype = errval & ~NVME_SC_DNR;
272
273 if (errval < 0) {
274 dev_err(ctrl->device,
275 "Connect command failed, errno: %d\n", errval);
276 return;
277 }
278
279 switch (err_sctype) {
280 case NVME_SC_CONNECT_INVALID_PARAM:
281 if (offset >> 16) {
282 char *inv_data = "Connect Invalid Data Parameter";
283
284 switch (offset & 0xffff) {
285 case (offsetof(struct nvmf_connect_data, cntlid)):
286 dev_err(ctrl->device,
287 "%s, cntlid: %d\n",
288 inv_data, data->cntlid);
289 break;
290 case (offsetof(struct nvmf_connect_data, hostnqn)):
291 dev_err(ctrl->device,
292 "%s, hostnqn \"%s\"\n",
293 inv_data, data->hostnqn);
294 break;
295 case (offsetof(struct nvmf_connect_data, subsysnqn)):
296 dev_err(ctrl->device,
297 "%s, subsysnqn \"%s\"\n",
298 inv_data, data->subsysnqn);
299 break;
300 default:
301 dev_err(ctrl->device,
302 "%s, starting byte offset: %d\n",
303 inv_data, offset & 0xffff);
304 break;
305 }
306 } else {
307 char *inv_sqe = "Connect Invalid SQE Parameter";
308
309 switch (offset) {
310 case (offsetof(struct nvmf_connect_command, qid)):
311 dev_err(ctrl->device,
312 "%s, qid %d\n",
313 inv_sqe, cmd->connect.qid);
314 break;
315 default:
316 dev_err(ctrl->device,
317 "%s, starting byte offset: %d\n",
318 inv_sqe, offset);
319 }
320 }
321 break;
322 case NVME_SC_CONNECT_INVALID_HOST:
323 dev_err(ctrl->device,
324 "Connect for subsystem %s is not allowed, hostnqn: %s\n",
325 data->subsysnqn, data->hostnqn);
326 break;
327 case NVME_SC_CONNECT_CTRL_BUSY:
328 dev_err(ctrl->device,
329 "Connect command failed: controller is busy or not available\n");
330 break;
331 case NVME_SC_CONNECT_FORMAT:
332 dev_err(ctrl->device,
333 "Connect incompatible format: %d",
334 cmd->connect.recfmt);
335 break;
336 case NVME_SC_HOST_PATH_ERROR:
337 dev_err(ctrl->device,
338 "Connect command failed: host path error\n");
339 break;
340 case NVME_SC_AUTH_REQUIRED:
341 dev_err(ctrl->device,
342 "Connect command failed: authentication required\n");
343 break;
344 default:
345 dev_err(ctrl->device,
346 "Connect command failed, error wo/DNR bit: %d\n",
347 err_sctype);
348 break;
349 }
350 }
351
352 /**
353 * nvmf_connect_admin_queue() - NVMe Fabrics Admin Queue "Connect"
354 * API function.
355 * @ctrl: Host nvme controller instance used to request
356 * a new NVMe controller allocation on the target
357 * system and establish an NVMe Admin connection to
358 * that controller.
359 *
360 * This function enables an NVMe host device to request a new allocation of
361 * an NVMe controller resource on a target system as well establish a
362 * fabrics-protocol connection of the NVMe Admin queue between the
363 * host system device and the allocated NVMe controller on the
364 * target system via a NVMe Fabrics "Connect" command.
365 *
366 * Return:
367 * 0: success
368 * > 0: NVMe error status code
369 * < 0: Linux errno error code
370 *
371 */
nvmf_connect_admin_queue(struct nvme_ctrl * ctrl)372 int nvmf_connect_admin_queue(struct nvme_ctrl *ctrl)
373 {
374 struct nvme_command cmd = { };
375 union nvme_result res;
376 struct nvmf_connect_data *data;
377 int ret;
378 u32 result;
379
380 cmd.connect.opcode = nvme_fabrics_command;
381 cmd.connect.fctype = nvme_fabrics_type_connect;
382 cmd.connect.qid = 0;
383 cmd.connect.sqsize = cpu_to_le16(NVME_AQ_DEPTH - 1);
384
385 /*
386 * Set keep-alive timeout in seconds granularity (ms * 1000)
387 */
388 cmd.connect.kato = cpu_to_le32(ctrl->kato * 1000);
389
390 if (ctrl->opts->disable_sqflow)
391 cmd.connect.cattr |= NVME_CONNECT_DISABLE_SQFLOW;
392
393 data = kzalloc(sizeof(*data), GFP_KERNEL);
394 if (!data)
395 return -ENOMEM;
396
397 uuid_copy(&data->hostid, &ctrl->opts->host->id);
398 data->cntlid = cpu_to_le16(0xffff);
399 strncpy(data->subsysnqn, ctrl->opts->subsysnqn, NVMF_NQN_SIZE);
400 strncpy(data->hostnqn, ctrl->opts->host->nqn, NVMF_NQN_SIZE);
401
402 ret = __nvme_submit_sync_cmd(ctrl->fabrics_q, &cmd, &res,
403 data, sizeof(*data), NVME_QID_ANY, 1,
404 BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT);
405 if (ret) {
406 nvmf_log_connect_error(ctrl, ret, le32_to_cpu(res.u32),
407 &cmd, data);
408 goto out_free_data;
409 }
410
411 result = le32_to_cpu(res.u32);
412 ctrl->cntlid = result & 0xFFFF;
413 if (result & (NVME_CONNECT_AUTHREQ_ATR | NVME_CONNECT_AUTHREQ_ASCR)) {
414 /* Secure concatenation is not implemented */
415 if (result & NVME_CONNECT_AUTHREQ_ASCR) {
416 dev_warn(ctrl->device,
417 "qid 0: secure concatenation is not supported\n");
418 ret = NVME_SC_AUTH_REQUIRED;
419 goto out_free_data;
420 }
421 /* Authentication required */
422 ret = nvme_auth_negotiate(ctrl, 0);
423 if (ret) {
424 dev_warn(ctrl->device,
425 "qid 0: authentication setup failed\n");
426 ret = NVME_SC_AUTH_REQUIRED;
427 goto out_free_data;
428 }
429 ret = nvme_auth_wait(ctrl, 0);
430 if (ret)
431 dev_warn(ctrl->device,
432 "qid 0: authentication failed\n");
433 else
434 dev_info(ctrl->device,
435 "qid 0: authenticated\n");
436 }
437 out_free_data:
438 kfree(data);
439 return ret;
440 }
441 EXPORT_SYMBOL_GPL(nvmf_connect_admin_queue);
442
443 /**
444 * nvmf_connect_io_queue() - NVMe Fabrics I/O Queue "Connect"
445 * API function.
446 * @ctrl: Host nvme controller instance used to establish an
447 * NVMe I/O queue connection to the already allocated NVMe
448 * controller on the target system.
449 * @qid: NVMe I/O queue number for the new I/O connection between
450 * host and target (note qid == 0 is illegal as this is
451 * the Admin queue, per NVMe standard).
452 *
453 * This function issues a fabrics-protocol connection
454 * of a NVMe I/O queue (via NVMe Fabrics "Connect" command)
455 * between the host system device and the allocated NVMe controller
456 * on the target system.
457 *
458 * Return:
459 * 0: success
460 * > 0: NVMe error status code
461 * < 0: Linux errno error code
462 */
nvmf_connect_io_queue(struct nvme_ctrl * ctrl,u16 qid)463 int nvmf_connect_io_queue(struct nvme_ctrl *ctrl, u16 qid)
464 {
465 struct nvme_command cmd = { };
466 struct nvmf_connect_data *data;
467 union nvme_result res;
468 int ret;
469 u32 result;
470
471 cmd.connect.opcode = nvme_fabrics_command;
472 cmd.connect.fctype = nvme_fabrics_type_connect;
473 cmd.connect.qid = cpu_to_le16(qid);
474 cmd.connect.sqsize = cpu_to_le16(ctrl->sqsize);
475
476 if (ctrl->opts->disable_sqflow)
477 cmd.connect.cattr |= NVME_CONNECT_DISABLE_SQFLOW;
478
479 data = kzalloc(sizeof(*data), GFP_KERNEL);
480 if (!data)
481 return -ENOMEM;
482
483 uuid_copy(&data->hostid, &ctrl->opts->host->id);
484 data->cntlid = cpu_to_le16(ctrl->cntlid);
485 strncpy(data->subsysnqn, ctrl->opts->subsysnqn, NVMF_NQN_SIZE);
486 strncpy(data->hostnqn, ctrl->opts->host->nqn, NVMF_NQN_SIZE);
487
488 ret = __nvme_submit_sync_cmd(ctrl->connect_q, &cmd, &res,
489 data, sizeof(*data), qid, 1,
490 BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT);
491 if (ret) {
492 nvmf_log_connect_error(ctrl, ret, le32_to_cpu(res.u32),
493 &cmd, data);
494 }
495 result = le32_to_cpu(res.u32);
496 if (result & (NVME_CONNECT_AUTHREQ_ATR | NVME_CONNECT_AUTHREQ_ASCR)) {
497 /* Secure concatenation is not implemented */
498 if (result & NVME_CONNECT_AUTHREQ_ASCR) {
499 dev_warn(ctrl->device,
500 "qid 0: secure concatenation is not supported\n");
501 ret = NVME_SC_AUTH_REQUIRED;
502 goto out_free_data;
503 }
504 /* Authentication required */
505 ret = nvme_auth_negotiate(ctrl, qid);
506 if (ret) {
507 dev_warn(ctrl->device,
508 "qid %d: authentication setup failed\n", qid);
509 ret = NVME_SC_AUTH_REQUIRED;
510 } else {
511 ret = nvme_auth_wait(ctrl, qid);
512 if (ret)
513 dev_warn(ctrl->device,
514 "qid %u: authentication failed\n", qid);
515 }
516 }
517 out_free_data:
518 kfree(data);
519 return ret;
520 }
521 EXPORT_SYMBOL_GPL(nvmf_connect_io_queue);
522
nvmf_should_reconnect(struct nvme_ctrl * ctrl)523 bool nvmf_should_reconnect(struct nvme_ctrl *ctrl)
524 {
525 if (ctrl->opts->max_reconnects == -1 ||
526 ctrl->nr_reconnects < ctrl->opts->max_reconnects)
527 return true;
528
529 return false;
530 }
531 EXPORT_SYMBOL_GPL(nvmf_should_reconnect);
532
533 /**
534 * nvmf_register_transport() - NVMe Fabrics Library registration function.
535 * @ops: Transport ops instance to be registered to the
536 * common fabrics library.
537 *
538 * API function that registers the type of specific transport fabric
539 * being implemented to the common NVMe fabrics library. Part of
540 * the overall init sequence of starting up a fabrics driver.
541 */
nvmf_register_transport(struct nvmf_transport_ops * ops)542 int nvmf_register_transport(struct nvmf_transport_ops *ops)
543 {
544 if (!ops->create_ctrl)
545 return -EINVAL;
546
547 down_write(&nvmf_transports_rwsem);
548 list_add_tail(&ops->entry, &nvmf_transports);
549 up_write(&nvmf_transports_rwsem);
550
551 return 0;
552 }
553 EXPORT_SYMBOL_GPL(nvmf_register_transport);
554
555 /**
556 * nvmf_unregister_transport() - NVMe Fabrics Library unregistration function.
557 * @ops: Transport ops instance to be unregistered from the
558 * common fabrics library.
559 *
560 * Fabrics API function that unregisters the type of specific transport
561 * fabric being implemented from the common NVMe fabrics library.
562 * Part of the overall exit sequence of unloading the implemented driver.
563 */
nvmf_unregister_transport(struct nvmf_transport_ops * ops)564 void nvmf_unregister_transport(struct nvmf_transport_ops *ops)
565 {
566 down_write(&nvmf_transports_rwsem);
567 list_del(&ops->entry);
568 up_write(&nvmf_transports_rwsem);
569 }
570 EXPORT_SYMBOL_GPL(nvmf_unregister_transport);
571
nvmf_lookup_transport(struct nvmf_ctrl_options * opts)572 static struct nvmf_transport_ops *nvmf_lookup_transport(
573 struct nvmf_ctrl_options *opts)
574 {
575 struct nvmf_transport_ops *ops;
576
577 lockdep_assert_held(&nvmf_transports_rwsem);
578
579 list_for_each_entry(ops, &nvmf_transports, entry) {
580 if (strcmp(ops->name, opts->transport) == 0)
581 return ops;
582 }
583
584 return NULL;
585 }
586
587 static const match_table_t opt_tokens = {
588 { NVMF_OPT_TRANSPORT, "transport=%s" },
589 { NVMF_OPT_TRADDR, "traddr=%s" },
590 { NVMF_OPT_TRSVCID, "trsvcid=%s" },
591 { NVMF_OPT_NQN, "nqn=%s" },
592 { NVMF_OPT_QUEUE_SIZE, "queue_size=%d" },
593 { NVMF_OPT_NR_IO_QUEUES, "nr_io_queues=%d" },
594 { NVMF_OPT_RECONNECT_DELAY, "reconnect_delay=%d" },
595 { NVMF_OPT_CTRL_LOSS_TMO, "ctrl_loss_tmo=%d" },
596 { NVMF_OPT_KATO, "keep_alive_tmo=%d" },
597 { NVMF_OPT_HOSTNQN, "hostnqn=%s" },
598 { NVMF_OPT_HOST_TRADDR, "host_traddr=%s" },
599 { NVMF_OPT_HOST_IFACE, "host_iface=%s" },
600 { NVMF_OPT_HOST_ID, "hostid=%s" },
601 { NVMF_OPT_DUP_CONNECT, "duplicate_connect" },
602 { NVMF_OPT_DISABLE_SQFLOW, "disable_sqflow" },
603 { NVMF_OPT_HDR_DIGEST, "hdr_digest" },
604 { NVMF_OPT_DATA_DIGEST, "data_digest" },
605 { NVMF_OPT_NR_WRITE_QUEUES, "nr_write_queues=%d" },
606 { NVMF_OPT_NR_POLL_QUEUES, "nr_poll_queues=%d" },
607 { NVMF_OPT_TOS, "tos=%d" },
608 { NVMF_OPT_FAIL_FAST_TMO, "fast_io_fail_tmo=%d" },
609 { NVMF_OPT_DISCOVERY, "discovery" },
610 { NVMF_OPT_DHCHAP_SECRET, "dhchap_secret=%s" },
611 { NVMF_OPT_DHCHAP_CTRL_SECRET, "dhchap_ctrl_secret=%s" },
612 { NVMF_OPT_ERR, NULL }
613 };
614
nvmf_parse_options(struct nvmf_ctrl_options * opts,const char * buf)615 static int nvmf_parse_options(struct nvmf_ctrl_options *opts,
616 const char *buf)
617 {
618 substring_t args[MAX_OPT_ARGS];
619 char *options, *o, *p;
620 int token, ret = 0;
621 size_t nqnlen = 0;
622 int ctrl_loss_tmo = NVMF_DEF_CTRL_LOSS_TMO;
623 uuid_t hostid;
624
625 /* Set defaults */
626 opts->queue_size = NVMF_DEF_QUEUE_SIZE;
627 opts->nr_io_queues = num_online_cpus();
628 opts->reconnect_delay = NVMF_DEF_RECONNECT_DELAY;
629 opts->kato = 0;
630 opts->duplicate_connect = false;
631 opts->fast_io_fail_tmo = NVMF_DEF_FAIL_FAST_TMO;
632 opts->hdr_digest = false;
633 opts->data_digest = false;
634 opts->tos = -1; /* < 0 == use transport default */
635
636 options = o = kstrdup(buf, GFP_KERNEL);
637 if (!options)
638 return -ENOMEM;
639
640 uuid_gen(&hostid);
641
642 while ((p = strsep(&o, ",\n")) != NULL) {
643 if (!*p)
644 continue;
645
646 token = match_token(p, opt_tokens, args);
647 opts->mask |= token;
648 switch (token) {
649 case NVMF_OPT_TRANSPORT:
650 p = match_strdup(args);
651 if (!p) {
652 ret = -ENOMEM;
653 goto out;
654 }
655 kfree(opts->transport);
656 opts->transport = p;
657 break;
658 case NVMF_OPT_NQN:
659 p = match_strdup(args);
660 if (!p) {
661 ret = -ENOMEM;
662 goto out;
663 }
664 kfree(opts->subsysnqn);
665 opts->subsysnqn = p;
666 nqnlen = strlen(opts->subsysnqn);
667 if (nqnlen >= NVMF_NQN_SIZE) {
668 pr_err("%s needs to be < %d bytes\n",
669 opts->subsysnqn, NVMF_NQN_SIZE);
670 ret = -EINVAL;
671 goto out;
672 }
673 opts->discovery_nqn =
674 !(strcmp(opts->subsysnqn,
675 NVME_DISC_SUBSYS_NAME));
676 break;
677 case NVMF_OPT_TRADDR:
678 p = match_strdup(args);
679 if (!p) {
680 ret = -ENOMEM;
681 goto out;
682 }
683 kfree(opts->traddr);
684 opts->traddr = p;
685 break;
686 case NVMF_OPT_TRSVCID:
687 p = match_strdup(args);
688 if (!p) {
689 ret = -ENOMEM;
690 goto out;
691 }
692 kfree(opts->trsvcid);
693 opts->trsvcid = p;
694 break;
695 case NVMF_OPT_QUEUE_SIZE:
696 if (match_int(args, &token)) {
697 ret = -EINVAL;
698 goto out;
699 }
700 if (token < NVMF_MIN_QUEUE_SIZE ||
701 token > NVMF_MAX_QUEUE_SIZE) {
702 pr_err("Invalid queue_size %d\n", token);
703 ret = -EINVAL;
704 goto out;
705 }
706 opts->queue_size = token;
707 break;
708 case NVMF_OPT_NR_IO_QUEUES:
709 if (match_int(args, &token)) {
710 ret = -EINVAL;
711 goto out;
712 }
713 if (token <= 0) {
714 pr_err("Invalid number of IOQs %d\n", token);
715 ret = -EINVAL;
716 goto out;
717 }
718 if (opts->discovery_nqn) {
719 pr_debug("Ignoring nr_io_queues value for discovery controller\n");
720 break;
721 }
722
723 opts->nr_io_queues = min_t(unsigned int,
724 num_online_cpus(), token);
725 break;
726 case NVMF_OPT_KATO:
727 if (match_int(args, &token)) {
728 ret = -EINVAL;
729 goto out;
730 }
731
732 if (token < 0) {
733 pr_err("Invalid keep_alive_tmo %d\n", token);
734 ret = -EINVAL;
735 goto out;
736 } else if (token == 0 && !opts->discovery_nqn) {
737 /* Allowed for debug */
738 pr_warn("keep_alive_tmo 0 won't execute keep alives!!!\n");
739 }
740 opts->kato = token;
741 break;
742 case NVMF_OPT_CTRL_LOSS_TMO:
743 if (match_int(args, &token)) {
744 ret = -EINVAL;
745 goto out;
746 }
747
748 if (token < 0)
749 pr_warn("ctrl_loss_tmo < 0 will reconnect forever\n");
750 ctrl_loss_tmo = token;
751 break;
752 case NVMF_OPT_FAIL_FAST_TMO:
753 if (match_int(args, &token)) {
754 ret = -EINVAL;
755 goto out;
756 }
757
758 if (token >= 0)
759 pr_warn("I/O fail on reconnect controller after %d sec\n",
760 token);
761 else
762 token = -1;
763
764 opts->fast_io_fail_tmo = token;
765 break;
766 case NVMF_OPT_HOSTNQN:
767 if (opts->host) {
768 pr_err("hostnqn already user-assigned: %s\n",
769 opts->host->nqn);
770 ret = -EADDRINUSE;
771 goto out;
772 }
773 p = match_strdup(args);
774 if (!p) {
775 ret = -ENOMEM;
776 goto out;
777 }
778 nqnlen = strlen(p);
779 if (nqnlen >= NVMF_NQN_SIZE) {
780 pr_err("%s needs to be < %d bytes\n",
781 p, NVMF_NQN_SIZE);
782 kfree(p);
783 ret = -EINVAL;
784 goto out;
785 }
786 opts->host = nvmf_host_add(p);
787 kfree(p);
788 if (!opts->host) {
789 ret = -ENOMEM;
790 goto out;
791 }
792 break;
793 case NVMF_OPT_RECONNECT_DELAY:
794 if (match_int(args, &token)) {
795 ret = -EINVAL;
796 goto out;
797 }
798 if (token <= 0) {
799 pr_err("Invalid reconnect_delay %d\n", token);
800 ret = -EINVAL;
801 goto out;
802 }
803 opts->reconnect_delay = token;
804 break;
805 case NVMF_OPT_HOST_TRADDR:
806 p = match_strdup(args);
807 if (!p) {
808 ret = -ENOMEM;
809 goto out;
810 }
811 kfree(opts->host_traddr);
812 opts->host_traddr = p;
813 break;
814 case NVMF_OPT_HOST_IFACE:
815 p = match_strdup(args);
816 if (!p) {
817 ret = -ENOMEM;
818 goto out;
819 }
820 kfree(opts->host_iface);
821 opts->host_iface = p;
822 break;
823 case NVMF_OPT_HOST_ID:
824 p = match_strdup(args);
825 if (!p) {
826 ret = -ENOMEM;
827 goto out;
828 }
829 ret = uuid_parse(p, &hostid);
830 if (ret) {
831 pr_err("Invalid hostid %s\n", p);
832 ret = -EINVAL;
833 kfree(p);
834 goto out;
835 }
836 kfree(p);
837 break;
838 case NVMF_OPT_DUP_CONNECT:
839 opts->duplicate_connect = true;
840 break;
841 case NVMF_OPT_DISABLE_SQFLOW:
842 opts->disable_sqflow = true;
843 break;
844 case NVMF_OPT_HDR_DIGEST:
845 opts->hdr_digest = true;
846 break;
847 case NVMF_OPT_DATA_DIGEST:
848 opts->data_digest = true;
849 break;
850 case NVMF_OPT_NR_WRITE_QUEUES:
851 if (match_int(args, &token)) {
852 ret = -EINVAL;
853 goto out;
854 }
855 if (token <= 0) {
856 pr_err("Invalid nr_write_queues %d\n", token);
857 ret = -EINVAL;
858 goto out;
859 }
860 opts->nr_write_queues = token;
861 break;
862 case NVMF_OPT_NR_POLL_QUEUES:
863 if (match_int(args, &token)) {
864 ret = -EINVAL;
865 goto out;
866 }
867 if (token <= 0) {
868 pr_err("Invalid nr_poll_queues %d\n", token);
869 ret = -EINVAL;
870 goto out;
871 }
872 opts->nr_poll_queues = token;
873 break;
874 case NVMF_OPT_TOS:
875 if (match_int(args, &token)) {
876 ret = -EINVAL;
877 goto out;
878 }
879 if (token < 0) {
880 pr_err("Invalid type of service %d\n", token);
881 ret = -EINVAL;
882 goto out;
883 }
884 if (token > 255) {
885 pr_warn("Clamping type of service to 255\n");
886 token = 255;
887 }
888 opts->tos = token;
889 break;
890 case NVMF_OPT_DISCOVERY:
891 opts->discovery_nqn = true;
892 break;
893 case NVMF_OPT_DHCHAP_SECRET:
894 p = match_strdup(args);
895 if (!p) {
896 ret = -ENOMEM;
897 goto out;
898 }
899 if (strlen(p) < 11 || strncmp(p, "DHHC-1:", 7)) {
900 pr_err("Invalid DH-CHAP secret %s\n", p);
901 ret = -EINVAL;
902 goto out;
903 }
904 kfree(opts->dhchap_secret);
905 opts->dhchap_secret = p;
906 break;
907 case NVMF_OPT_DHCHAP_CTRL_SECRET:
908 p = match_strdup(args);
909 if (!p) {
910 ret = -ENOMEM;
911 goto out;
912 }
913 if (strlen(p) < 11 || strncmp(p, "DHHC-1:", 7)) {
914 pr_err("Invalid DH-CHAP secret %s\n", p);
915 ret = -EINVAL;
916 goto out;
917 }
918 kfree(opts->dhchap_ctrl_secret);
919 opts->dhchap_ctrl_secret = p;
920 break;
921 default:
922 pr_warn("unknown parameter or missing value '%s' in ctrl creation request\n",
923 p);
924 ret = -EINVAL;
925 goto out;
926 }
927 }
928
929 if (opts->discovery_nqn) {
930 opts->nr_io_queues = 0;
931 opts->nr_write_queues = 0;
932 opts->nr_poll_queues = 0;
933 opts->duplicate_connect = true;
934 } else {
935 if (!opts->kato)
936 opts->kato = NVME_DEFAULT_KATO;
937 }
938 if (ctrl_loss_tmo < 0) {
939 opts->max_reconnects = -1;
940 } else {
941 opts->max_reconnects = DIV_ROUND_UP(ctrl_loss_tmo,
942 opts->reconnect_delay);
943 if (ctrl_loss_tmo < opts->fast_io_fail_tmo)
944 pr_warn("failfast tmo (%d) larger than controller loss tmo (%d)\n",
945 opts->fast_io_fail_tmo, ctrl_loss_tmo);
946 }
947
948 if (!opts->host) {
949 kref_get(&nvmf_default_host->ref);
950 opts->host = nvmf_default_host;
951 }
952
953 uuid_copy(&opts->host->id, &hostid);
954
955 out:
956 kfree(options);
957 return ret;
958 }
959
nvmf_check_required_opts(struct nvmf_ctrl_options * opts,unsigned int required_opts)960 static int nvmf_check_required_opts(struct nvmf_ctrl_options *opts,
961 unsigned int required_opts)
962 {
963 if ((opts->mask & required_opts) != required_opts) {
964 unsigned int i;
965
966 for (i = 0; i < ARRAY_SIZE(opt_tokens); i++) {
967 if ((opt_tokens[i].token & required_opts) &&
968 !(opt_tokens[i].token & opts->mask)) {
969 pr_warn("missing parameter '%s'\n",
970 opt_tokens[i].pattern);
971 }
972 }
973
974 return -EINVAL;
975 }
976
977 return 0;
978 }
979
nvmf_ip_options_match(struct nvme_ctrl * ctrl,struct nvmf_ctrl_options * opts)980 bool nvmf_ip_options_match(struct nvme_ctrl *ctrl,
981 struct nvmf_ctrl_options *opts)
982 {
983 if (!nvmf_ctlr_matches_baseopts(ctrl, opts) ||
984 strcmp(opts->traddr, ctrl->opts->traddr) ||
985 strcmp(opts->trsvcid, ctrl->opts->trsvcid))
986 return false;
987
988 /*
989 * Checking the local address or host interfaces is rough.
990 *
991 * In most cases, none is specified and the host port or
992 * host interface is selected by the stack.
993 *
994 * Assume no match if:
995 * - local address or host interface is specified and address
996 * or host interface is not the same
997 * - local address or host interface is not specified but
998 * remote is, or vice versa (admin using specific
999 * host_traddr/host_iface when it matters).
1000 */
1001 if ((opts->mask & NVMF_OPT_HOST_TRADDR) &&
1002 (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)) {
1003 if (strcmp(opts->host_traddr, ctrl->opts->host_traddr))
1004 return false;
1005 } else if ((opts->mask & NVMF_OPT_HOST_TRADDR) ||
1006 (ctrl->opts->mask & NVMF_OPT_HOST_TRADDR)) {
1007 return false;
1008 }
1009
1010 if ((opts->mask & NVMF_OPT_HOST_IFACE) &&
1011 (ctrl->opts->mask & NVMF_OPT_HOST_IFACE)) {
1012 if (strcmp(opts->host_iface, ctrl->opts->host_iface))
1013 return false;
1014 } else if ((opts->mask & NVMF_OPT_HOST_IFACE) ||
1015 (ctrl->opts->mask & NVMF_OPT_HOST_IFACE)) {
1016 return false;
1017 }
1018
1019 return true;
1020 }
1021 EXPORT_SYMBOL_GPL(nvmf_ip_options_match);
1022
nvmf_check_allowed_opts(struct nvmf_ctrl_options * opts,unsigned int allowed_opts)1023 static int nvmf_check_allowed_opts(struct nvmf_ctrl_options *opts,
1024 unsigned int allowed_opts)
1025 {
1026 if (opts->mask & ~allowed_opts) {
1027 unsigned int i;
1028
1029 for (i = 0; i < ARRAY_SIZE(opt_tokens); i++) {
1030 if ((opt_tokens[i].token & opts->mask) &&
1031 (opt_tokens[i].token & ~allowed_opts)) {
1032 pr_warn("invalid parameter '%s'\n",
1033 opt_tokens[i].pattern);
1034 }
1035 }
1036
1037 return -EINVAL;
1038 }
1039
1040 return 0;
1041 }
1042
nvmf_free_options(struct nvmf_ctrl_options * opts)1043 void nvmf_free_options(struct nvmf_ctrl_options *opts)
1044 {
1045 nvmf_host_put(opts->host);
1046 kfree(opts->transport);
1047 kfree(opts->traddr);
1048 kfree(opts->trsvcid);
1049 kfree(opts->subsysnqn);
1050 kfree(opts->host_traddr);
1051 kfree(opts->host_iface);
1052 kfree(opts->dhchap_secret);
1053 kfree(opts->dhchap_ctrl_secret);
1054 kfree(opts);
1055 }
1056 EXPORT_SYMBOL_GPL(nvmf_free_options);
1057
1058 #define NVMF_REQUIRED_OPTS (NVMF_OPT_TRANSPORT | NVMF_OPT_NQN)
1059 #define NVMF_ALLOWED_OPTS (NVMF_OPT_QUEUE_SIZE | NVMF_OPT_NR_IO_QUEUES | \
1060 NVMF_OPT_KATO | NVMF_OPT_HOSTNQN | \
1061 NVMF_OPT_HOST_ID | NVMF_OPT_DUP_CONNECT |\
1062 NVMF_OPT_DISABLE_SQFLOW | NVMF_OPT_DISCOVERY |\
1063 NVMF_OPT_FAIL_FAST_TMO | NVMF_OPT_DHCHAP_SECRET |\
1064 NVMF_OPT_DHCHAP_CTRL_SECRET)
1065
1066 static struct nvme_ctrl *
nvmf_create_ctrl(struct device * dev,const char * buf)1067 nvmf_create_ctrl(struct device *dev, const char *buf)
1068 {
1069 struct nvmf_ctrl_options *opts;
1070 struct nvmf_transport_ops *ops;
1071 struct nvme_ctrl *ctrl;
1072 int ret;
1073
1074 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1075 if (!opts)
1076 return ERR_PTR(-ENOMEM);
1077
1078 ret = nvmf_parse_options(opts, buf);
1079 if (ret)
1080 goto out_free_opts;
1081
1082
1083 request_module("nvme-%s", opts->transport);
1084
1085 /*
1086 * Check the generic options first as we need a valid transport for
1087 * the lookup below. Then clear the generic flags so that transport
1088 * drivers don't have to care about them.
1089 */
1090 ret = nvmf_check_required_opts(opts, NVMF_REQUIRED_OPTS);
1091 if (ret)
1092 goto out_free_opts;
1093 opts->mask &= ~NVMF_REQUIRED_OPTS;
1094
1095 down_read(&nvmf_transports_rwsem);
1096 ops = nvmf_lookup_transport(opts);
1097 if (!ops) {
1098 pr_info("no handler found for transport %s.\n",
1099 opts->transport);
1100 ret = -EINVAL;
1101 goto out_unlock;
1102 }
1103
1104 if (!try_module_get(ops->module)) {
1105 ret = -EBUSY;
1106 goto out_unlock;
1107 }
1108 up_read(&nvmf_transports_rwsem);
1109
1110 ret = nvmf_check_required_opts(opts, ops->required_opts);
1111 if (ret)
1112 goto out_module_put;
1113 ret = nvmf_check_allowed_opts(opts, NVMF_ALLOWED_OPTS |
1114 ops->allowed_opts | ops->required_opts);
1115 if (ret)
1116 goto out_module_put;
1117
1118 ctrl = ops->create_ctrl(dev, opts);
1119 if (IS_ERR(ctrl)) {
1120 ret = PTR_ERR(ctrl);
1121 goto out_module_put;
1122 }
1123
1124 module_put(ops->module);
1125 return ctrl;
1126
1127 out_module_put:
1128 module_put(ops->module);
1129 goto out_free_opts;
1130 out_unlock:
1131 up_read(&nvmf_transports_rwsem);
1132 out_free_opts:
1133 nvmf_free_options(opts);
1134 return ERR_PTR(ret);
1135 }
1136
1137 static struct class *nvmf_class;
1138 static struct device *nvmf_device;
1139 static DEFINE_MUTEX(nvmf_dev_mutex);
1140
nvmf_dev_write(struct file * file,const char __user * ubuf,size_t count,loff_t * pos)1141 static ssize_t nvmf_dev_write(struct file *file, const char __user *ubuf,
1142 size_t count, loff_t *pos)
1143 {
1144 struct seq_file *seq_file = file->private_data;
1145 struct nvme_ctrl *ctrl;
1146 const char *buf;
1147 int ret = 0;
1148
1149 if (count > PAGE_SIZE)
1150 return -ENOMEM;
1151
1152 buf = memdup_user_nul(ubuf, count);
1153 if (IS_ERR(buf))
1154 return PTR_ERR(buf);
1155
1156 mutex_lock(&nvmf_dev_mutex);
1157 if (seq_file->private) {
1158 ret = -EINVAL;
1159 goto out_unlock;
1160 }
1161
1162 ctrl = nvmf_create_ctrl(nvmf_device, buf);
1163 if (IS_ERR(ctrl)) {
1164 ret = PTR_ERR(ctrl);
1165 goto out_unlock;
1166 }
1167
1168 seq_file->private = ctrl;
1169
1170 out_unlock:
1171 mutex_unlock(&nvmf_dev_mutex);
1172 kfree(buf);
1173 return ret ? ret : count;
1174 }
1175
__nvmf_concat_opt_tokens(struct seq_file * seq_file)1176 static void __nvmf_concat_opt_tokens(struct seq_file *seq_file)
1177 {
1178 const struct match_token *tok;
1179 int idx;
1180
1181 /*
1182 * Add dummy entries for instance and cntlid to
1183 * signal an invalid/non-existing controller
1184 */
1185 seq_puts(seq_file, "instance=-1,cntlid=-1");
1186 for (idx = 0; idx < ARRAY_SIZE(opt_tokens); idx++) {
1187 tok = &opt_tokens[idx];
1188 if (tok->token == NVMF_OPT_ERR)
1189 continue;
1190 seq_puts(seq_file, ",");
1191 seq_puts(seq_file, tok->pattern);
1192 }
1193 seq_puts(seq_file, "\n");
1194 }
1195
nvmf_dev_show(struct seq_file * seq_file,void * private)1196 static int nvmf_dev_show(struct seq_file *seq_file, void *private)
1197 {
1198 struct nvme_ctrl *ctrl;
1199
1200 mutex_lock(&nvmf_dev_mutex);
1201 ctrl = seq_file->private;
1202 if (!ctrl) {
1203 __nvmf_concat_opt_tokens(seq_file);
1204 goto out_unlock;
1205 }
1206
1207 seq_printf(seq_file, "instance=%d,cntlid=%d\n",
1208 ctrl->instance, ctrl->cntlid);
1209
1210 out_unlock:
1211 mutex_unlock(&nvmf_dev_mutex);
1212 return 0;
1213 }
1214
nvmf_dev_open(struct inode * inode,struct file * file)1215 static int nvmf_dev_open(struct inode *inode, struct file *file)
1216 {
1217 /*
1218 * The miscdevice code initializes file->private_data, but doesn't
1219 * make use of it later.
1220 */
1221 file->private_data = NULL;
1222 return single_open(file, nvmf_dev_show, NULL);
1223 }
1224
nvmf_dev_release(struct inode * inode,struct file * file)1225 static int nvmf_dev_release(struct inode *inode, struct file *file)
1226 {
1227 struct seq_file *seq_file = file->private_data;
1228 struct nvme_ctrl *ctrl = seq_file->private;
1229
1230 if (ctrl)
1231 nvme_put_ctrl(ctrl);
1232 return single_release(inode, file);
1233 }
1234
1235 static const struct file_operations nvmf_dev_fops = {
1236 .owner = THIS_MODULE,
1237 .write = nvmf_dev_write,
1238 .read = seq_read,
1239 .open = nvmf_dev_open,
1240 .release = nvmf_dev_release,
1241 };
1242
1243 static struct miscdevice nvmf_misc = {
1244 .minor = MISC_DYNAMIC_MINOR,
1245 .name = "nvme-fabrics",
1246 .fops = &nvmf_dev_fops,
1247 };
1248
nvmf_init(void)1249 static int __init nvmf_init(void)
1250 {
1251 int ret;
1252
1253 nvmf_default_host = nvmf_host_default();
1254 if (!nvmf_default_host)
1255 return -ENOMEM;
1256
1257 nvmf_class = class_create(THIS_MODULE, "nvme-fabrics");
1258 if (IS_ERR(nvmf_class)) {
1259 pr_err("couldn't register class nvme-fabrics\n");
1260 ret = PTR_ERR(nvmf_class);
1261 goto out_free_host;
1262 }
1263
1264 nvmf_device =
1265 device_create(nvmf_class, NULL, MKDEV(0, 0), NULL, "ctl");
1266 if (IS_ERR(nvmf_device)) {
1267 pr_err("couldn't create nvme-fabrics device!\n");
1268 ret = PTR_ERR(nvmf_device);
1269 goto out_destroy_class;
1270 }
1271
1272 ret = misc_register(&nvmf_misc);
1273 if (ret) {
1274 pr_err("couldn't register misc device: %d\n", ret);
1275 goto out_destroy_device;
1276 }
1277
1278 return 0;
1279
1280 out_destroy_device:
1281 device_destroy(nvmf_class, MKDEV(0, 0));
1282 out_destroy_class:
1283 class_destroy(nvmf_class);
1284 out_free_host:
1285 nvmf_host_put(nvmf_default_host);
1286 return ret;
1287 }
1288
nvmf_exit(void)1289 static void __exit nvmf_exit(void)
1290 {
1291 misc_deregister(&nvmf_misc);
1292 device_destroy(nvmf_class, MKDEV(0, 0));
1293 class_destroy(nvmf_class);
1294 nvmf_host_put(nvmf_default_host);
1295
1296 BUILD_BUG_ON(sizeof(struct nvmf_common_command) != 64);
1297 BUILD_BUG_ON(sizeof(struct nvmf_connect_command) != 64);
1298 BUILD_BUG_ON(sizeof(struct nvmf_property_get_command) != 64);
1299 BUILD_BUG_ON(sizeof(struct nvmf_property_set_command) != 64);
1300 BUILD_BUG_ON(sizeof(struct nvmf_auth_send_command) != 64);
1301 BUILD_BUG_ON(sizeof(struct nvmf_auth_receive_command) != 64);
1302 BUILD_BUG_ON(sizeof(struct nvmf_connect_data) != 1024);
1303 BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_negotiate_data) != 8);
1304 BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_challenge_data) != 16);
1305 BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_reply_data) != 16);
1306 BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_success1_data) != 16);
1307 BUILD_BUG_ON(sizeof(struct nvmf_auth_dhchap_success2_data) != 16);
1308 }
1309
1310 MODULE_LICENSE("GPL v2");
1311
1312 module_init(nvmf_init);
1313 module_exit(nvmf_exit);
1314