Line data Source code
1 : /* SPDX-License-Identifier: BSD-3-Clause
2 : * Copyright (C) 2017 Intel Corporation.
3 : * All rights reserved.
4 : */
5 :
6 : #include "spdk/stdinc.h"
7 :
8 : #include "spdk/bdev.h"
9 : #include "spdk/env.h"
10 : #include "spdk/fd.h"
11 : #include "spdk/thread.h"
12 : #include "spdk/json.h"
13 : #include "spdk/util.h"
14 : #include "spdk/rpc.h"
15 : #include "spdk/string.h"
16 : #include "spdk/iscsi_spec.h"
17 :
18 : #include "spdk/log.h"
19 : #include "spdk/bdev_module.h"
20 :
21 : #include "iscsi/iscsi.h"
22 : #include "iscsi/scsi-lowlevel.h"
23 :
24 : #include "bdev_iscsi.h"
25 :
26 : struct bdev_iscsi_lun;
27 :
28 : #define BDEV_ISCSI_CONNECTION_POLL_US 500 /* 0.5 ms */
29 : #define BDEV_ISCSI_NO_MAIN_CH_POLL_US 10000 /* 10ms */
30 :
31 : #define BDEV_ISCSI_TIMEOUT_POLL_PERIOD_DEFAULT 1000000ULL /* 1 s */
32 : #define BDEV_ISCSI_TIMEOUT_DEFAULT 30 /* 30 s */
33 : #define BDEV_ISCSI_TIMEOUT_POLL_PERIOD_DIVISOR 30
34 :
35 : #define DEFAULT_INITIATOR_NAME "iqn.2016-06.io.spdk:init"
36 :
37 : /* MAXIMUM UNMAP LBA COUNT:
38 : * indicates the maximum number of LBAs that may be unmapped
39 : * by an UNMAP command.
40 : */
41 : #define BDEV_ISCSI_DEFAULT_MAX_UNMAP_LBA_COUNT (32768)
42 :
43 : /* MAXIMUM UNMAP BLOCK DESCRIPTOR COUNT:
44 : * indicates the maximum number of UNMAP block descriptors that
45 : * shall be contained in the parameter data transferred to the
46 : * device server for an UNMAP command.
47 : */
48 : #define BDEV_ISCSI_MAX_UNMAP_BLOCK_DESCS_COUNT (1)
49 :
50 : static int bdev_iscsi_initialize(void);
51 : static void bdev_iscsi_readcapacity16(struct iscsi_context *context, struct bdev_iscsi_lun *lun);
52 : static void _bdev_iscsi_submit_request(void *_bdev_io);
53 :
54 : static TAILQ_HEAD(, bdev_iscsi_conn_req) g_iscsi_conn_req = TAILQ_HEAD_INITIALIZER(
55 : g_iscsi_conn_req);
56 : static struct spdk_poller *g_conn_poller = NULL;
57 :
58 : struct bdev_iscsi_io {
59 : struct spdk_thread *submit_td;
60 : struct bdev_iscsi_lun *lun;
61 : enum spdk_bdev_io_status status;
62 : int scsi_status;
63 : enum spdk_scsi_sense sk;
64 : uint8_t asc;
65 : uint8_t ascq;
66 : };
67 :
68 : struct bdev_iscsi_lun {
69 : struct spdk_bdev bdev;
70 : struct iscsi_context *context;
71 : char *initiator_iqn;
72 : int lun_id;
73 : char *url;
74 : pthread_mutex_t mutex;
75 : uint32_t ch_count;
76 : struct spdk_thread *main_td;
77 : struct spdk_poller *no_main_ch_poller;
78 : struct spdk_thread *no_main_ch_poller_td;
79 : bool unmap_supported;
80 : uint32_t max_unmap;
81 : struct spdk_poller *poller;
82 : struct spdk_poller *timeout_poller;
83 : };
84 :
85 : struct bdev_iscsi_io_channel {
86 : struct bdev_iscsi_lun *lun;
87 : };
88 :
89 : struct bdev_iscsi_conn_req {
90 : char *url;
91 : char *bdev_name;
92 : char *initiator_iqn;
93 : struct iscsi_context *context;
94 : spdk_bdev_iscsi_create_cb create_cb;
95 : void *create_cb_arg;
96 : bool unmap_supported;
97 : uint32_t max_unmap;
98 : int lun;
99 : int status;
100 : TAILQ_ENTRY(bdev_iscsi_conn_req) link;
101 : };
102 :
103 : static struct spdk_bdev_iscsi_opts g_opts = {
104 : .timeout_sec = BDEV_ISCSI_TIMEOUT_DEFAULT,
105 : .timeout_poller_period_us = BDEV_ISCSI_TIMEOUT_POLL_PERIOD_DEFAULT,
106 : };
107 :
108 : void
109 0 : bdev_iscsi_get_opts(struct spdk_bdev_iscsi_opts *opts)
110 : {
111 0 : *opts = g_opts;
112 0 : }
113 :
114 : int
115 0 : bdev_iscsi_set_opts(struct spdk_bdev_iscsi_opts *opts)
116 : {
117 : /* make the poller period equal to timeout / 30 */
118 0 : opts->timeout_poller_period_us = (opts->timeout_sec * 1000000ULL) /
119 : BDEV_ISCSI_TIMEOUT_POLL_PERIOD_DIVISOR;
120 :
121 0 : g_opts = *opts;
122 :
123 0 : return 0;
124 : }
125 :
126 : static void
127 0 : complete_conn_req(struct bdev_iscsi_conn_req *req, struct spdk_bdev *bdev,
128 : int status)
129 : {
130 0 : TAILQ_REMOVE(&g_iscsi_conn_req, req, link);
131 0 : req->create_cb(req->create_cb_arg, bdev, status);
132 :
133 : /*
134 : * we are still running in the context of iscsi_service()
135 : * so do not tear down its data structures here
136 : */
137 0 : req->status = status;
138 0 : }
139 :
140 : static int
141 0 : bdev_iscsi_get_ctx_size(void)
142 : {
143 0 : return sizeof(struct bdev_iscsi_io);
144 : }
145 :
146 : static void
147 0 : _iscsi_free_lun(void *arg)
148 : {
149 0 : struct bdev_iscsi_lun *lun = arg;
150 :
151 0 : assert(lun != NULL);
152 0 : iscsi_destroy_context(lun->context);
153 0 : pthread_mutex_destroy(&lun->mutex);
154 0 : free(lun->bdev.name);
155 0 : free(lun->url);
156 0 : free(lun->initiator_iqn);
157 :
158 0 : spdk_bdev_destruct_done(&lun->bdev, 0);
159 0 : free(lun);
160 0 : }
161 :
162 : static void
163 0 : _bdev_iscsi_conn_req_free(struct bdev_iscsi_conn_req *req)
164 : {
165 0 : free(req->initiator_iqn);
166 0 : free(req->bdev_name);
167 0 : free(req->url);
168 : /* destroy will call iscsi_disconnect() implicitly if connected */
169 0 : iscsi_destroy_context(req->context);
170 0 : free(req);
171 0 : }
172 :
173 : static void
174 0 : bdev_iscsi_finish(void)
175 : {
176 0 : struct bdev_iscsi_conn_req *req, *tmp;
177 :
178 : /* clear out pending connection requests here. We cannot
179 : * simply set the state to a non SCSI_STATUS_GOOD state as
180 : * the connection poller won't run anymore
181 : */
182 0 : TAILQ_FOREACH_SAFE(req, &g_iscsi_conn_req, link, tmp) {
183 0 : _bdev_iscsi_conn_req_free(req);
184 0 : }
185 :
186 0 : if (g_conn_poller) {
187 0 : spdk_poller_unregister(&g_conn_poller);
188 0 : }
189 0 : }
190 :
191 : static void
192 0 : bdev_iscsi_opts_config_json(struct spdk_json_write_ctx *w)
193 : {
194 0 : spdk_json_write_object_begin(w);
195 :
196 0 : spdk_json_write_named_string(w, "method", "bdev_iscsi_set_options");
197 :
198 0 : spdk_json_write_named_object_begin(w, "params");
199 0 : spdk_json_write_named_uint64(w, "timeout_sec", g_opts.timeout_sec);
200 0 : spdk_json_write_object_end(w);
201 :
202 0 : spdk_json_write_object_end(w);
203 0 : }
204 :
205 : static int
206 0 : bdev_iscsi_config_json(struct spdk_json_write_ctx *w)
207 : {
208 0 : bdev_iscsi_opts_config_json(w);
209 0 : return 0;
210 : }
211 :
212 : static struct spdk_bdev_module g_iscsi_bdev_module = {
213 : .name = "iscsi",
214 : .module_init = bdev_iscsi_initialize,
215 : .module_fini = bdev_iscsi_finish,
216 : .config_json = bdev_iscsi_config_json,
217 : .get_ctx_size = bdev_iscsi_get_ctx_size,
218 : };
219 :
220 0 : SPDK_BDEV_MODULE_REGISTER(iscsi, &g_iscsi_bdev_module);
221 :
222 : static void
223 0 : _bdev_iscsi_io_complete(void *_iscsi_io)
224 : {
225 0 : struct bdev_iscsi_io *iscsi_io = _iscsi_io;
226 :
227 0 : if (iscsi_io->status == SPDK_BDEV_IO_STATUS_SUCCESS) {
228 0 : spdk_bdev_io_complete_scsi_status(spdk_bdev_io_from_ctx(iscsi_io), iscsi_io->scsi_status,
229 0 : iscsi_io->sk, iscsi_io->asc, iscsi_io->ascq);
230 0 : } else {
231 0 : spdk_bdev_io_complete(spdk_bdev_io_from_ctx(iscsi_io), iscsi_io->status);
232 : }
233 0 : }
234 :
235 : static void
236 0 : bdev_iscsi_io_complete(struct bdev_iscsi_io *iscsi_io, enum spdk_bdev_io_status status)
237 : {
238 0 : iscsi_io->status = status;
239 0 : if (iscsi_io->submit_td != NULL) {
240 0 : spdk_thread_send_msg(iscsi_io->submit_td, _bdev_iscsi_io_complete, iscsi_io);
241 0 : } else {
242 0 : _bdev_iscsi_io_complete(iscsi_io);
243 : }
244 0 : }
245 :
246 : static bool
247 0 : _bdev_iscsi_is_size_change(int status, struct scsi_task *task)
248 : {
249 0 : if (status == SPDK_SCSI_STATUS_CHECK_CONDITION &&
250 0 : (uint8_t)task->sense.key == SPDK_SCSI_SENSE_UNIT_ATTENTION &&
251 0 : task->sense.ascq == 0x2a09) {
252 : /* ASCQ: SCSI_SENSE_ASCQ_CAPACITY_DATA_HAS_CHANGED (0x2a09) */
253 0 : return true;
254 : }
255 :
256 0 : return false;
257 0 : }
258 :
259 : /* Common call back function for read/write/flush command */
260 : static void
261 0 : bdev_iscsi_command_cb(struct iscsi_context *context, int status, void *_task, void *_iscsi_io)
262 : {
263 0 : struct scsi_task *task = _task;
264 0 : struct bdev_iscsi_io *iscsi_io = _iscsi_io;
265 0 : struct spdk_bdev_io *bdev_io;
266 :
267 0 : iscsi_io->scsi_status = status;
268 0 : iscsi_io->sk = (uint8_t)task->sense.key;
269 0 : iscsi_io->asc = (task->sense.ascq >> 8) & 0xFF;
270 0 : iscsi_io->ascq = task->sense.ascq & 0xFF;
271 :
272 0 : if (_bdev_iscsi_is_size_change(status, task)) {
273 0 : bdev_iscsi_readcapacity16(context, iscsi_io->lun);
274 :
275 : /* Retry this failed IO immediately */
276 0 : bdev_io = spdk_bdev_io_from_ctx(iscsi_io);
277 0 : if (iscsi_io->submit_td != NULL) {
278 0 : spdk_thread_send_msg(iscsi_io->lun->main_td,
279 0 : _bdev_iscsi_submit_request, bdev_io);
280 0 : } else {
281 0 : _bdev_iscsi_submit_request(bdev_io);
282 : }
283 0 : } else {
284 0 : bdev_iscsi_io_complete(iscsi_io, SPDK_BDEV_IO_STATUS_SUCCESS);
285 : }
286 :
287 0 : scsi_free_scsi_task(task);
288 0 : }
289 :
290 : static int
291 0 : bdev_iscsi_resize(struct spdk_bdev *bdev, const uint64_t new_size_in_block)
292 : {
293 0 : int rc;
294 :
295 0 : assert(bdev->module == &g_iscsi_bdev_module);
296 :
297 0 : if (new_size_in_block <= bdev->blockcnt) {
298 0 : SPDK_ERRLOG("The new bdev size must be larger than current bdev size.\n");
299 0 : return -EINVAL;
300 : }
301 :
302 0 : rc = spdk_bdev_notify_blockcnt_change(bdev, new_size_in_block);
303 0 : if (rc != 0) {
304 0 : SPDK_ERRLOG("failed to notify block cnt change.\n");
305 0 : return rc;
306 : }
307 :
308 0 : return 0;
309 0 : }
310 :
311 : static void
312 0 : bdev_iscsi_readcapacity16_cb(struct iscsi_context *context, int status, void *_task,
313 : void *private_data)
314 : {
315 0 : struct bdev_iscsi_lun *lun = private_data;
316 0 : struct scsi_readcapacity16 *readcap16;
317 0 : struct scsi_task *task = _task;
318 0 : uint64_t size_in_block = 0;
319 0 : int rc;
320 :
321 0 : if (status != SPDK_SCSI_STATUS_GOOD) {
322 0 : SPDK_ERRLOG("iSCSI error: %s\n", iscsi_get_error(context));
323 0 : goto ret;
324 : }
325 :
326 0 : readcap16 = scsi_datain_unmarshall(task);
327 0 : if (!readcap16) {
328 0 : SPDK_ERRLOG("Read capacity error\n");
329 0 : goto ret;
330 : }
331 :
332 0 : size_in_block = readcap16->returned_lba + 1;
333 :
334 0 : rc = bdev_iscsi_resize(&lun->bdev, size_in_block);
335 0 : if (rc != 0) {
336 0 : SPDK_ERRLOG("Bdev (%s) resize error: %d\n", lun->bdev.name, rc);
337 0 : }
338 :
339 : ret:
340 0 : scsi_free_scsi_task(task);
341 0 : }
342 :
343 : static void
344 0 : bdev_iscsi_readcapacity16(struct iscsi_context *context, struct bdev_iscsi_lun *lun)
345 : {
346 0 : struct scsi_task *task;
347 :
348 0 : task = iscsi_readcapacity16_task(context, lun->lun_id,
349 0 : bdev_iscsi_readcapacity16_cb, lun);
350 0 : if (task == NULL) {
351 0 : SPDK_ERRLOG("failed to get readcapacity16_task\n");
352 0 : }
353 0 : }
354 :
355 : static void
356 0 : bdev_iscsi_readv(struct bdev_iscsi_lun *lun, struct bdev_iscsi_io *iscsi_io,
357 : struct iovec *iov, int iovcnt, uint64_t nbytes, uint64_t lba)
358 : {
359 0 : struct scsi_task *task;
360 :
361 0 : SPDK_DEBUGLOG(iscsi_init, "read %d iovs size %lu to lba: %#lx\n",
362 : iovcnt, nbytes, lba);
363 :
364 0 : task = iscsi_read16_task(lun->context, lun->lun_id, lba, nbytes, lun->bdev.blocklen, 0, 0, 0, 0, 0,
365 0 : bdev_iscsi_command_cb, iscsi_io);
366 0 : if (task == NULL) {
367 0 : SPDK_ERRLOG("failed to get read16_task\n");
368 0 : bdev_iscsi_io_complete(iscsi_io, SPDK_BDEV_IO_STATUS_FAILED);
369 0 : return;
370 : }
371 :
372 : #if defined(LIBISCSI_FEATURE_IOVECTOR)
373 0 : scsi_task_set_iov_in(task, (struct scsi_iovec *)iov, iovcnt);
374 : #else
375 : int i;
376 : for (i = 0; i < iovcnt; i++) {
377 : scsi_task_add_data_in_buffer(task, iov[i].iov_len, iov[i].iov_base);
378 : }
379 : #endif
380 0 : }
381 :
382 : static void
383 0 : bdev_iscsi_writev(struct bdev_iscsi_lun *lun, struct bdev_iscsi_io *iscsi_io,
384 : struct iovec *iov, int iovcnt, uint64_t nbytes, uint64_t lba)
385 : {
386 0 : struct scsi_task *task;
387 :
388 0 : SPDK_DEBUGLOG(iscsi_init, "write %d iovs size %lu to lba: %#lx\n",
389 : iovcnt, nbytes, lba);
390 :
391 0 : task = iscsi_write16_task(lun->context, lun->lun_id, lba, NULL, nbytes, lun->bdev.blocklen, 0, 0, 0,
392 : 0, 0,
393 0 : bdev_iscsi_command_cb, iscsi_io);
394 0 : if (task == NULL) {
395 0 : SPDK_ERRLOG("failed to get write16_task\n");
396 0 : bdev_iscsi_io_complete(iscsi_io, SPDK_BDEV_IO_STATUS_FAILED);
397 0 : return;
398 : }
399 :
400 : #if defined(LIBISCSI_FEATURE_IOVECTOR)
401 0 : scsi_task_set_iov_out(task, (struct scsi_iovec *)iov, iovcnt);
402 : #else
403 : int i;
404 : for (i = 0; i < iovcnt; i++) {
405 : scsi_task_add_data_in_buffer(task, iov[i].iov_len, iov[i].iov_base);
406 : }
407 : #endif
408 0 : }
409 :
410 : static void
411 0 : bdev_iscsi_destruct_cb(void *ctx)
412 : {
413 0 : struct bdev_iscsi_lun *lun = ctx;
414 :
415 0 : spdk_poller_unregister(&lun->no_main_ch_poller);
416 0 : spdk_io_device_unregister(lun, _iscsi_free_lun);
417 0 : }
418 :
419 : static int
420 0 : bdev_iscsi_destruct(void *ctx)
421 : {
422 0 : struct bdev_iscsi_lun *lun = ctx;
423 :
424 0 : assert(lun->no_main_ch_poller_td);
425 0 : spdk_thread_send_msg(lun->no_main_ch_poller_td, bdev_iscsi_destruct_cb, lun);
426 0 : return 1;
427 0 : }
428 :
429 : static void
430 0 : bdev_iscsi_flush(struct bdev_iscsi_lun *lun, struct bdev_iscsi_io *iscsi_io, uint32_t num_blocks,
431 : int immed, uint64_t lba)
432 : {
433 0 : struct scsi_task *task;
434 :
435 0 : task = iscsi_synchronizecache16_task(lun->context, lun->lun_id, lba,
436 0 : num_blocks, 0, immed, bdev_iscsi_command_cb, iscsi_io);
437 0 : if (task == NULL) {
438 0 : SPDK_ERRLOG("failed to get sync16_task\n");
439 0 : bdev_iscsi_io_complete(iscsi_io, SPDK_BDEV_IO_STATUS_FAILED);
440 0 : return;
441 : }
442 0 : }
443 :
444 : static void
445 0 : bdev_iscsi_unmap(struct bdev_iscsi_lun *lun, struct bdev_iscsi_io *iscsi_io,
446 : uint64_t lba, uint64_t num_blocks)
447 : {
448 0 : struct scsi_task *task;
449 0 : struct unmap_list list[BDEV_ISCSI_MAX_UNMAP_BLOCK_DESCS_COUNT] = {};
450 0 : struct unmap_list *entry;
451 0 : uint32_t num_unmap_list;
452 0 : uint64_t offset, remaining, unmap_blocks;
453 :
454 0 : num_unmap_list = spdk_divide_round_up(num_blocks, lun->max_unmap);
455 0 : if (num_unmap_list > BDEV_ISCSI_MAX_UNMAP_BLOCK_DESCS_COUNT) {
456 0 : SPDK_ERRLOG("Too many unmap entries\n");
457 0 : goto failed;
458 : }
459 :
460 0 : remaining = num_blocks;
461 0 : offset = lba;
462 0 : num_unmap_list = 0;
463 0 : entry = &list[0];
464 :
465 0 : do {
466 0 : unmap_blocks = spdk_min(remaining, lun->max_unmap);
467 0 : entry->lba = offset;
468 0 : entry->num = unmap_blocks;
469 0 : num_unmap_list++;
470 0 : remaining -= unmap_blocks;
471 0 : offset += unmap_blocks;
472 0 : entry++;
473 0 : } while (remaining > 0);
474 :
475 0 : task = iscsi_unmap_task(lun->context, lun->lun_id, 0, 0, list, num_unmap_list,
476 0 : bdev_iscsi_command_cb, iscsi_io);
477 0 : if (task != NULL) {
478 0 : return;
479 : }
480 0 : SPDK_ERRLOG("failed to get unmap_task\n");
481 :
482 : failed:
483 0 : bdev_iscsi_io_complete(iscsi_io, SPDK_BDEV_IO_STATUS_FAILED);
484 0 : }
485 :
486 : static void
487 0 : bdev_iscsi_reset_cb(struct iscsi_context *context __attribute__((unused)), int status,
488 : void *command_data, void *private_data)
489 : {
490 0 : uint32_t tmf_response;
491 0 : struct bdev_iscsi_io *iscsi_io = private_data;
492 :
493 0 : tmf_response = *(uint32_t *)command_data;
494 0 : if (tmf_response == ISCSI_TASK_FUNC_RESP_COMPLETE) {
495 0 : bdev_iscsi_io_complete(iscsi_io, SPDK_BDEV_IO_STATUS_SUCCESS);
496 0 : } else {
497 0 : bdev_iscsi_io_complete(iscsi_io, SPDK_BDEV_IO_STATUS_FAILED);
498 : }
499 0 : }
500 :
501 : static void
502 0 : _bdev_iscsi_reset(void *_bdev_io)
503 : {
504 0 : int rc;
505 0 : struct spdk_bdev_io *bdev_io = _bdev_io;
506 0 : struct bdev_iscsi_lun *lun = (struct bdev_iscsi_lun *)bdev_io->bdev->ctxt;
507 0 : struct bdev_iscsi_io *iscsi_io = (struct bdev_iscsi_io *)bdev_io->driver_ctx;
508 0 : struct iscsi_context *context = lun->context;
509 :
510 0 : rc = iscsi_task_mgmt_lun_reset_async(context, lun->lun_id,
511 0 : bdev_iscsi_reset_cb, iscsi_io);
512 0 : if (rc != 0) {
513 0 : SPDK_ERRLOG("failed to do iscsi reset\n");
514 0 : bdev_iscsi_io_complete(iscsi_io, SPDK_BDEV_IO_STATUS_FAILED);
515 0 : return;
516 : }
517 0 : }
518 :
519 : static void
520 0 : bdev_iscsi_reset(struct spdk_bdev_io *bdev_io)
521 : {
522 0 : struct bdev_iscsi_lun *lun = (struct bdev_iscsi_lun *)bdev_io->bdev->ctxt;
523 0 : spdk_thread_send_msg(lun->main_td, _bdev_iscsi_reset, bdev_io);
524 0 : }
525 :
526 : static int
527 0 : bdev_iscsi_poll_lun(void *_lun)
528 : {
529 0 : struct bdev_iscsi_lun *lun = _lun;
530 0 : struct pollfd pfd = {};
531 :
532 0 : pfd.fd = iscsi_get_fd(lun->context);
533 0 : pfd.events = iscsi_which_events(lun->context);
534 :
535 0 : if (poll(&pfd, 1, 0) < 0) {
536 0 : SPDK_ERRLOG("poll failed\n");
537 0 : return SPDK_POLLER_IDLE;
538 : }
539 :
540 0 : if (pfd.revents != 0) {
541 0 : if (iscsi_service(lun->context, pfd.revents) < 0) {
542 0 : SPDK_ERRLOG("iscsi_service failed: %s\n", iscsi_get_error(lun->context));
543 0 : }
544 :
545 0 : return SPDK_POLLER_BUSY;
546 : }
547 :
548 0 : return SPDK_POLLER_IDLE;
549 0 : }
550 :
551 : static int
552 0 : bdev_iscsi_poll_lun_timeout(void *_lun)
553 : {
554 0 : struct bdev_iscsi_lun *lun = _lun;
555 : /* passing 0 here to iscsi_service means do nothing except for timeout checks */
556 0 : iscsi_service(lun->context, 0);
557 0 : return SPDK_POLLER_BUSY;
558 0 : }
559 :
560 : static int
561 0 : bdev_iscsi_no_main_ch_poll(void *arg)
562 : {
563 0 : struct bdev_iscsi_lun *lun = arg;
564 0 : enum spdk_thread_poller_rc rc = SPDK_POLLER_IDLE;
565 :
566 0 : if (pthread_mutex_trylock(&lun->mutex)) {
567 : /* Don't care about the error code here. */
568 0 : return SPDK_POLLER_IDLE;
569 : }
570 :
571 0 : if (lun->ch_count == 0) {
572 0 : rc = bdev_iscsi_poll_lun(arg);
573 0 : }
574 :
575 0 : pthread_mutex_unlock(&lun->mutex);
576 0 : return rc;
577 0 : }
578 :
579 : static void
580 0 : bdev_iscsi_get_buf_cb(struct spdk_io_channel *ch, struct spdk_bdev_io *bdev_io,
581 : bool success)
582 : {
583 0 : if (!success) {
584 0 : spdk_bdev_io_complete(bdev_io, SPDK_BDEV_IO_STATUS_FAILED);
585 0 : return;
586 : }
587 :
588 0 : bdev_iscsi_readv((struct bdev_iscsi_lun *)bdev_io->bdev->ctxt,
589 0 : (struct bdev_iscsi_io *)bdev_io->driver_ctx,
590 0 : bdev_io->u.bdev.iovs,
591 0 : bdev_io->u.bdev.iovcnt,
592 0 : bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen,
593 0 : bdev_io->u.bdev.offset_blocks);
594 0 : }
595 :
596 : static void
597 0 : _bdev_iscsi_submit_request(void *_bdev_io)
598 : {
599 0 : struct spdk_bdev_io *bdev_io = _bdev_io;
600 0 : struct bdev_iscsi_io *iscsi_io = (struct bdev_iscsi_io *)bdev_io->driver_ctx;
601 0 : struct bdev_iscsi_lun *lun = (struct bdev_iscsi_lun *)bdev_io->bdev->ctxt;
602 :
603 0 : switch (bdev_io->type) {
604 : case SPDK_BDEV_IO_TYPE_READ:
605 0 : spdk_bdev_io_get_buf(bdev_io, bdev_iscsi_get_buf_cb,
606 0 : bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen);
607 0 : break;
608 :
609 : case SPDK_BDEV_IO_TYPE_WRITE:
610 0 : bdev_iscsi_writev(lun, iscsi_io,
611 0 : bdev_io->u.bdev.iovs,
612 0 : bdev_io->u.bdev.iovcnt,
613 0 : bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen,
614 0 : bdev_io->u.bdev.offset_blocks);
615 0 : break;
616 : case SPDK_BDEV_IO_TYPE_FLUSH:
617 0 : bdev_iscsi_flush(lun, iscsi_io,
618 0 : bdev_io->u.bdev.num_blocks,
619 : ISCSI_IMMEDIATE_DATA_NO,
620 0 : bdev_io->u.bdev.offset_blocks);
621 0 : break;
622 : case SPDK_BDEV_IO_TYPE_RESET:
623 0 : bdev_iscsi_reset(bdev_io);
624 0 : break;
625 : case SPDK_BDEV_IO_TYPE_UNMAP:
626 0 : bdev_iscsi_unmap(lun, iscsi_io,
627 0 : bdev_io->u.bdev.offset_blocks,
628 0 : bdev_io->u.bdev.num_blocks);
629 0 : break;
630 : default:
631 0 : bdev_iscsi_io_complete(iscsi_io, SPDK_BDEV_IO_STATUS_FAILED);
632 0 : break;
633 : }
634 0 : }
635 :
636 : static void
637 0 : bdev_iscsi_submit_request(struct spdk_io_channel *_ch, struct spdk_bdev_io *bdev_io)
638 : {
639 0 : struct spdk_thread *submit_td = spdk_io_channel_get_thread(_ch);
640 0 : struct bdev_iscsi_io *iscsi_io = (struct bdev_iscsi_io *)bdev_io->driver_ctx;
641 0 : struct bdev_iscsi_lun *lun = (struct bdev_iscsi_lun *)bdev_io->bdev->ctxt;
642 :
643 0 : iscsi_io->lun = lun;
644 :
645 0 : if (lun->main_td != submit_td) {
646 0 : iscsi_io->submit_td = submit_td;
647 0 : spdk_thread_send_msg(lun->main_td, _bdev_iscsi_submit_request, bdev_io);
648 0 : return;
649 : } else {
650 0 : iscsi_io->submit_td = NULL;
651 : }
652 :
653 0 : _bdev_iscsi_submit_request(bdev_io);
654 0 : }
655 :
656 : static bool
657 0 : bdev_iscsi_io_type_supported(void *ctx, enum spdk_bdev_io_type io_type)
658 : {
659 0 : struct bdev_iscsi_lun *lun = ctx;
660 :
661 0 : switch (io_type) {
662 : case SPDK_BDEV_IO_TYPE_READ:
663 : case SPDK_BDEV_IO_TYPE_WRITE:
664 : case SPDK_BDEV_IO_TYPE_FLUSH:
665 : case SPDK_BDEV_IO_TYPE_RESET:
666 0 : return true;
667 :
668 : case SPDK_BDEV_IO_TYPE_UNMAP:
669 0 : return lun->unmap_supported;
670 : default:
671 0 : return false;
672 : }
673 0 : }
674 :
675 : static int
676 0 : bdev_iscsi_create_cb(void *io_device, void *ctx_buf)
677 : {
678 0 : struct bdev_iscsi_io_channel *ch = ctx_buf;
679 0 : struct bdev_iscsi_lun *lun = io_device;
680 :
681 0 : pthread_mutex_lock(&lun->mutex);
682 0 : if (lun->ch_count == 0) {
683 0 : assert(lun->main_td == NULL);
684 0 : lun->main_td = spdk_get_thread();
685 0 : lun->poller = SPDK_POLLER_REGISTER(bdev_iscsi_poll_lun, lun, 0);
686 0 : if (g_opts.timeout_sec > 0) {
687 0 : lun->timeout_poller = SPDK_POLLER_REGISTER(bdev_iscsi_poll_lun_timeout, lun,
688 : g_opts.timeout_poller_period_us);
689 0 : }
690 0 : ch->lun = lun;
691 0 : }
692 0 : lun->ch_count++;
693 0 : pthread_mutex_unlock(&lun->mutex);
694 :
695 0 : return 0;
696 0 : }
697 :
698 : static void
699 0 : _iscsi_destroy_cb(void *ctx)
700 : {
701 0 : struct bdev_iscsi_lun *lun = ctx;
702 :
703 0 : pthread_mutex_lock(&lun->mutex);
704 :
705 0 : assert(lun->main_td == spdk_get_thread());
706 0 : assert(lun->ch_count > 0);
707 :
708 0 : lun->ch_count--;
709 0 : if (lun->ch_count > 0) {
710 0 : pthread_mutex_unlock(&lun->mutex);
711 0 : return;
712 : }
713 :
714 0 : lun->main_td = NULL;
715 0 : spdk_poller_unregister(&lun->poller);
716 0 : spdk_poller_unregister(&lun->timeout_poller);
717 :
718 0 : pthread_mutex_unlock(&lun->mutex);
719 0 : }
720 :
721 : static void
722 0 : bdev_iscsi_destroy_cb(void *io_device, void *ctx_buf)
723 : {
724 0 : struct bdev_iscsi_lun *lun = io_device;
725 0 : struct spdk_thread *thread;
726 :
727 0 : pthread_mutex_lock(&lun->mutex);
728 0 : lun->ch_count--;
729 0 : if (lun->ch_count == 0) {
730 0 : assert(lun->main_td != NULL);
731 :
732 0 : if (lun->main_td != spdk_get_thread()) {
733 : /* The final channel was destroyed on a different thread
734 : * than where the first channel was created. Pass a message
735 : * to the main thread to unregister the poller. */
736 0 : lun->ch_count++;
737 0 : thread = lun->main_td;
738 0 : pthread_mutex_unlock(&lun->mutex);
739 0 : spdk_thread_send_msg(thread, _iscsi_destroy_cb, lun);
740 0 : return;
741 : }
742 :
743 0 : lun->main_td = NULL;
744 0 : spdk_poller_unregister(&lun->poller);
745 0 : spdk_poller_unregister(&lun->timeout_poller);
746 0 : }
747 0 : pthread_mutex_unlock(&lun->mutex);
748 0 : }
749 :
750 : static struct spdk_io_channel *
751 0 : bdev_iscsi_get_io_channel(void *ctx)
752 : {
753 0 : struct bdev_iscsi_lun *lun = ctx;
754 :
755 0 : return spdk_get_io_channel(lun);
756 0 : }
757 :
758 : static int
759 0 : bdev_iscsi_dump_info_json(void *ctx, struct spdk_json_write_ctx *w)
760 : {
761 0 : struct bdev_iscsi_lun *lun = ctx;
762 :
763 0 : spdk_json_write_named_object_begin(w, "iscsi");
764 0 : spdk_json_write_named_string(w, "initiator_name", lun->initiator_iqn);
765 0 : spdk_json_write_named_string(w, "url", lun->url);
766 0 : spdk_json_write_object_end(w);
767 :
768 0 : return 0;
769 0 : }
770 :
771 : static void
772 0 : bdev_iscsi_write_config_json(struct spdk_bdev *bdev, struct spdk_json_write_ctx *w)
773 : {
774 0 : struct bdev_iscsi_lun *lun = bdev->ctxt;
775 :
776 0 : pthread_mutex_lock(&lun->mutex);
777 0 : spdk_json_write_object_begin(w);
778 :
779 0 : spdk_json_write_named_string(w, "method", "bdev_iscsi_create");
780 :
781 0 : spdk_json_write_named_object_begin(w, "params");
782 0 : spdk_json_write_named_string(w, "name", bdev->name);
783 0 : spdk_json_write_named_string(w, "initiator_iqn", lun->initiator_iqn);
784 0 : spdk_json_write_named_string(w, "url", lun->url);
785 0 : spdk_json_write_object_end(w);
786 :
787 0 : spdk_json_write_object_end(w);
788 0 : pthread_mutex_unlock(&lun->mutex);
789 0 : }
790 :
791 : static const struct spdk_bdev_fn_table iscsi_fn_table = {
792 : .destruct = bdev_iscsi_destruct,
793 : .submit_request = bdev_iscsi_submit_request,
794 : .io_type_supported = bdev_iscsi_io_type_supported,
795 : .get_io_channel = bdev_iscsi_get_io_channel,
796 : .dump_info_json = bdev_iscsi_dump_info_json,
797 : .write_config_json = bdev_iscsi_write_config_json,
798 : };
799 :
800 : static int
801 0 : create_iscsi_lun(struct bdev_iscsi_conn_req *req, uint64_t num_blocks,
802 : uint32_t block_size, struct spdk_bdev **bdev, uint8_t lbppbe)
803 : {
804 0 : struct bdev_iscsi_lun *lun;
805 0 : int rc;
806 :
807 0 : lun = calloc(1, sizeof(*lun));
808 0 : if (!lun) {
809 0 : SPDK_ERRLOG("Unable to allocate enough memory for iscsi backend\n");
810 0 : return -ENOMEM;
811 : }
812 :
813 0 : lun->context = req->context;
814 0 : lun->lun_id = req->lun;
815 0 : lun->url = req->url;
816 0 : lun->initiator_iqn = req->initiator_iqn;
817 :
818 0 : pthread_mutex_init(&lun->mutex, NULL);
819 :
820 0 : lun->bdev.name = req->bdev_name;
821 0 : lun->bdev.product_name = "iSCSI LUN";
822 0 : lun->bdev.module = &g_iscsi_bdev_module;
823 0 : lun->bdev.blocklen = block_size;
824 0 : lun->bdev.phys_blocklen = block_size * (1 << lbppbe);
825 0 : lun->bdev.blockcnt = num_blocks;
826 0 : lun->bdev.ctxt = lun;
827 0 : lun->unmap_supported = req->unmap_supported;
828 0 : if (lun->unmap_supported) {
829 0 : lun->max_unmap = req->max_unmap;
830 0 : lun->bdev.max_unmap = req->max_unmap;
831 0 : lun->bdev.max_unmap_segments = BDEV_ISCSI_MAX_UNMAP_BLOCK_DESCS_COUNT;
832 0 : }
833 :
834 0 : lun->bdev.fn_table = &iscsi_fn_table;
835 :
836 0 : spdk_io_device_register(lun, bdev_iscsi_create_cb, bdev_iscsi_destroy_cb,
837 : sizeof(struct bdev_iscsi_io_channel),
838 0 : req->bdev_name);
839 0 : rc = spdk_bdev_register(&lun->bdev);
840 0 : if (rc) {
841 0 : spdk_io_device_unregister(lun, NULL);
842 0 : pthread_mutex_destroy(&lun->mutex);
843 0 : free(lun);
844 0 : return rc;
845 : }
846 :
847 0 : lun->no_main_ch_poller_td = spdk_get_thread();
848 0 : lun->no_main_ch_poller = SPDK_POLLER_REGISTER(bdev_iscsi_no_main_ch_poll, lun,
849 : BDEV_ISCSI_NO_MAIN_CH_POLL_US);
850 :
851 0 : *bdev = &lun->bdev;
852 0 : return 0;
853 0 : }
854 :
855 : static void
856 0 : iscsi_readcapacity16_cb(struct iscsi_context *iscsi, int status,
857 : void *command_data, void *private_data)
858 : {
859 0 : struct bdev_iscsi_conn_req *req = private_data;
860 0 : struct scsi_readcapacity16 *readcap16;
861 0 : struct spdk_bdev *bdev = NULL;
862 0 : struct scsi_task *task = command_data;
863 0 : struct scsi_task *retry_task = NULL;
864 :
865 0 : if (status != SPDK_SCSI_STATUS_GOOD) {
866 0 : SPDK_ERRLOG("iSCSI error: %s\n", iscsi_get_error(iscsi));
867 0 : if (_bdev_iscsi_is_size_change(status, task)) {
868 0 : scsi_free_scsi_task(task);
869 0 : retry_task = iscsi_readcapacity16_task(iscsi, req->lun,
870 0 : iscsi_readcapacity16_cb, req);
871 0 : if (retry_task) {
872 0 : return;
873 : }
874 0 : }
875 0 : goto ret;
876 : }
877 :
878 0 : readcap16 = scsi_datain_unmarshall(task);
879 0 : if (!readcap16) {
880 0 : status = -ENOMEM;
881 0 : goto ret;
882 : }
883 :
884 0 : status = create_iscsi_lun(req, readcap16->returned_lba + 1, readcap16->block_length, &bdev,
885 0 : readcap16->lbppbe);
886 0 : if (status) {
887 0 : SPDK_ERRLOG("Unable to create iscsi bdev: %s (%d)\n", spdk_strerror(-status), status);
888 0 : }
889 :
890 : ret:
891 0 : scsi_free_scsi_task(task);
892 0 : complete_conn_req(req, bdev, status);
893 0 : }
894 :
895 : static void
896 0 : bdev_iscsi_inquiry_bl_cb(struct iscsi_context *context, int status, void *_task, void *private_data)
897 : {
898 0 : struct scsi_task *task = _task;
899 0 : struct scsi_inquiry_block_limits *bl_inq = NULL;
900 0 : struct bdev_iscsi_conn_req *req = private_data;
901 :
902 0 : if (status == SPDK_SCSI_STATUS_GOOD) {
903 0 : bl_inq = scsi_datain_unmarshall(task);
904 0 : if (bl_inq != NULL) {
905 0 : if (!bl_inq->max_unmap) {
906 0 : SPDK_ERRLOG("Invalid max_unmap, use the default\n");
907 0 : req->max_unmap = BDEV_ISCSI_DEFAULT_MAX_UNMAP_LBA_COUNT;
908 0 : } else {
909 0 : req->max_unmap = bl_inq->max_unmap;
910 : }
911 0 : }
912 0 : }
913 :
914 0 : scsi_free_scsi_task(task);
915 0 : task = iscsi_readcapacity16_task(context, req->lun, iscsi_readcapacity16_cb, req);
916 0 : if (task) {
917 0 : return;
918 : }
919 :
920 0 : SPDK_ERRLOG("iSCSI error: %s\n", iscsi_get_error(req->context));
921 0 : complete_conn_req(req, NULL, status);
922 0 : }
923 :
924 : static void
925 0 : bdev_iscsi_inquiry_lbp_cb(struct iscsi_context *context, int status, void *_task,
926 : void *private_data)
927 : {
928 0 : struct scsi_task *task = _task;
929 0 : struct scsi_inquiry_logical_block_provisioning *lbp_inq = NULL;
930 0 : struct bdev_iscsi_conn_req *req = private_data;
931 :
932 0 : if (status == SPDK_SCSI_STATUS_GOOD) {
933 0 : lbp_inq = scsi_datain_unmarshall(task);
934 0 : if (lbp_inq != NULL && lbp_inq->lbpu) {
935 0 : req->unmap_supported = true;
936 0 : scsi_free_scsi_task(task);
937 :
938 0 : task = iscsi_inquiry_task(context, req->lun, 1,
939 : SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
940 0 : 255, bdev_iscsi_inquiry_bl_cb, req);
941 0 : if (task) {
942 0 : return;
943 : }
944 0 : }
945 0 : } else {
946 0 : scsi_free_scsi_task(task);
947 : }
948 :
949 0 : task = iscsi_readcapacity16_task(context, req->lun, iscsi_readcapacity16_cb, req);
950 0 : if (task) {
951 0 : return;
952 : }
953 :
954 0 : SPDK_ERRLOG("iSCSI error: %s\n", iscsi_get_error(req->context));
955 0 : complete_conn_req(req, NULL, status);
956 0 : }
957 :
958 : static void
959 0 : iscsi_connect_cb(struct iscsi_context *iscsi, int status,
960 : void *command_data, void *private_data)
961 : {
962 0 : struct bdev_iscsi_conn_req *req = private_data;
963 0 : struct scsi_task *task;
964 :
965 0 : if (status != SPDK_SCSI_STATUS_GOOD) {
966 0 : goto ret;
967 : }
968 :
969 0 : task = iscsi_inquiry_task(iscsi, req->lun, 1,
970 : SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
971 0 : 255, bdev_iscsi_inquiry_lbp_cb, req);
972 0 : if (task) {
973 0 : return;
974 : }
975 :
976 : ret:
977 0 : SPDK_ERRLOG("iSCSI error: %s\n", iscsi_get_error(req->context));
978 0 : complete_conn_req(req, NULL, status);
979 0 : }
980 :
981 : static int
982 0 : iscsi_bdev_conn_poll(void *arg)
983 : {
984 0 : struct bdev_iscsi_conn_req *req, *tmp;
985 0 : struct pollfd pfd;
986 0 : struct iscsi_context *context;
987 :
988 0 : if (TAILQ_EMPTY(&g_iscsi_conn_req)) {
989 0 : spdk_poller_unregister(&g_conn_poller);
990 0 : return SPDK_POLLER_IDLE;
991 : }
992 :
993 0 : TAILQ_FOREACH_SAFE(req, &g_iscsi_conn_req, link, tmp) {
994 0 : context = req->context;
995 0 : pfd.fd = iscsi_get_fd(context);
996 0 : pfd.events = iscsi_which_events(context);
997 0 : pfd.revents = 0;
998 0 : if (poll(&pfd, 1, 0) < 0) {
999 0 : SPDK_ERRLOG("poll failed\n");
1000 0 : return SPDK_POLLER_BUSY;
1001 : }
1002 :
1003 0 : if (pfd.revents != 0) {
1004 0 : if (iscsi_service(context, pfd.revents) < 0) {
1005 0 : SPDK_ERRLOG("iscsi_service failed: %s\n", iscsi_get_error(context));
1006 0 : }
1007 0 : }
1008 :
1009 0 : if (req->status == 0) {
1010 : /*
1011 : * The request completed successfully.
1012 : */
1013 0 : free(req);
1014 0 : } else if (req->status > 0) {
1015 : /*
1016 : * An error has occurred during connecting. This req has already
1017 : * been removed from the g_iscsi_conn_req list, but we needed to
1018 : * wait until iscsi_service unwound before we could free the req.
1019 : */
1020 0 : _bdev_iscsi_conn_req_free(req);
1021 0 : }
1022 0 : }
1023 0 : return SPDK_POLLER_BUSY;
1024 0 : }
1025 :
1026 : int
1027 0 : create_iscsi_disk(const char *bdev_name, const char *url, const char *initiator_iqn,
1028 : spdk_bdev_iscsi_create_cb cb_fn, void *cb_arg)
1029 : {
1030 0 : struct bdev_iscsi_conn_req *req;
1031 0 : struct iscsi_url *iscsi_url = NULL;
1032 0 : int rc;
1033 :
1034 0 : if (!bdev_name || !url || !initiator_iqn || strlen(initiator_iqn) == 0 || !cb_fn) {
1035 0 : return -EINVAL;
1036 : }
1037 :
1038 0 : req = calloc(1, sizeof(struct bdev_iscsi_conn_req));
1039 0 : if (!req) {
1040 0 : SPDK_ERRLOG("Cannot allocate pointer of struct bdev_iscsi_conn_req\n");
1041 0 : return -ENOMEM;
1042 : }
1043 :
1044 0 : req->status = SCSI_STATUS_GOOD;
1045 0 : req->bdev_name = strdup(bdev_name);
1046 0 : req->url = strdup(url);
1047 0 : req->initiator_iqn = strdup(initiator_iqn);
1048 0 : req->context = iscsi_create_context(initiator_iqn);
1049 0 : if (!req->bdev_name || !req->url || !req->initiator_iqn || !req->context) {
1050 0 : SPDK_ERRLOG("Out of memory\n");
1051 0 : rc = -ENOMEM;
1052 0 : goto err;
1053 : }
1054 :
1055 0 : req->create_cb = cb_fn;
1056 0 : req->create_cb_arg = cb_arg;
1057 :
1058 0 : iscsi_url = iscsi_parse_full_url(req->context, url);
1059 0 : if (iscsi_url == NULL) {
1060 0 : SPDK_ERRLOG("could not parse URL: %s\n", iscsi_get_error(req->context));
1061 0 : rc = -EINVAL;
1062 0 : goto err;
1063 : }
1064 :
1065 0 : req->lun = iscsi_url->lun;
1066 0 : rc = iscsi_set_session_type(req->context, ISCSI_SESSION_NORMAL);
1067 0 : rc = rc ? rc : iscsi_set_header_digest(req->context, ISCSI_HEADER_DIGEST_NONE);
1068 0 : rc = rc ? rc : iscsi_set_targetname(req->context, iscsi_url->target);
1069 0 : rc = rc ? rc : iscsi_set_timeout(req->context, g_opts.timeout_sec);
1070 0 : rc = rc ? rc : iscsi_full_connect_async(req->context, iscsi_url->portal, iscsi_url->lun,
1071 0 : iscsi_connect_cb, req);
1072 0 : if (rc == 0 && iscsi_url->user[0] != '\0') {
1073 0 : rc = iscsi_set_initiator_username_pwd(req->context, iscsi_url->user, iscsi_url->passwd);
1074 0 : }
1075 :
1076 0 : if (rc < 0) {
1077 0 : SPDK_ERRLOG("Failed to connect provided URL=%s: %s\n", url, iscsi_get_error(req->context));
1078 0 : goto err;
1079 : }
1080 :
1081 0 : iscsi_destroy_url(iscsi_url);
1082 0 : req->status = -1;
1083 0 : TAILQ_INSERT_TAIL(&g_iscsi_conn_req, req, link);
1084 0 : if (!g_conn_poller) {
1085 0 : g_conn_poller = SPDK_POLLER_REGISTER(iscsi_bdev_conn_poll, NULL, BDEV_ISCSI_CONNECTION_POLL_US);
1086 0 : }
1087 :
1088 0 : return 0;
1089 :
1090 : err:
1091 : /* iscsi_destroy_url() is not NULL-proof */
1092 0 : if (iscsi_url) {
1093 0 : iscsi_destroy_url(iscsi_url);
1094 0 : }
1095 :
1096 0 : if (req->context) {
1097 0 : iscsi_destroy_context(req->context);
1098 0 : }
1099 :
1100 0 : free(req->initiator_iqn);
1101 0 : free(req->bdev_name);
1102 0 : free(req->url);
1103 0 : free(req);
1104 0 : return rc;
1105 0 : }
1106 :
1107 : void
1108 0 : delete_iscsi_disk(const char *bdev_name, spdk_delete_iscsi_complete cb_fn, void *cb_arg)
1109 : {
1110 0 : int rc;
1111 :
1112 0 : rc = spdk_bdev_unregister_by_name(bdev_name, &g_iscsi_bdev_module, cb_fn, cb_arg);
1113 0 : if (rc != 0) {
1114 0 : cb_fn(cb_arg, rc);
1115 0 : }
1116 0 : }
1117 :
1118 : static int
1119 0 : bdev_iscsi_initialize(void)
1120 : {
1121 0 : return 0;
1122 : }
1123 :
1124 0 : SPDK_LOG_REGISTER_COMPONENT(iscsi_init)
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