Line data Source code
1 : /* SPDX-License-Identifier: BSD-3-Clause
2 : * Copyright (C) 2018 Intel Corporation.
3 : * All rights reserved.
4 : * Copyright (c) 2022, 2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
5 : */
6 :
7 : #include "spdk/stdinc.h"
8 :
9 : #include "spdk/init.h"
10 : #include "spdk/util.h"
11 : #include "spdk/file.h"
12 : #include "spdk/log.h"
13 : #include "spdk/env.h"
14 : #include "spdk/thread.h"
15 : #include "spdk/jsonrpc.h"
16 : #include "spdk/rpc.h"
17 : #include "spdk/string.h"
18 :
19 : #include "spdk_internal/event.h"
20 :
21 : #define SPDK_DEBUG_APP_CFG(...) SPDK_DEBUGLOG(app_config, __VA_ARGS__)
22 :
23 : /* JSON configuration format is as follows
24 : *
25 : * {
26 : * "subsystems" : [ <<== *subsystems JSON array
27 : * { <<== *subsystems_it array entry pointer (iterator)
28 : * "subsystem": "<< SUBSYSTEM NAME >>",
29 : * "config": [ <<== *config JSON array
30 : * { <<== *config_it array entry pointer (iterator)
31 : * "method": "<< METHOD NAME >>", <<== *method
32 : * "params": { << PARAMS >> } <<== *params
33 : * },
34 : * << MORE "config" ARRAY ENTRIES >>
35 : * ]
36 : * },
37 : * << MORE "subsystems" ARRAY ENTRIES >>
38 : * ]
39 : *
40 : * << ANYTHING ELSE IS IGNORED IN ROOT OBJECT>>
41 : * }
42 : *
43 : */
44 :
45 : struct load_json_config_ctx;
46 : typedef void (*client_resp_handler)(struct load_json_config_ctx *,
47 : struct spdk_jsonrpc_client_response *);
48 :
49 : #define RPC_SOCKET_PATH_MAX SPDK_SIZEOF_MEMBER(struct sockaddr_un, sun_path)
50 :
51 : /* 1s connections timeout */
52 : #define RPC_CLIENT_CONNECT_TIMEOUT_US (1U * 1000U * 1000U)
53 :
54 : /*
55 : * Currently there is no timeout in SPDK for any RPC command. This result that
56 : * we can't put a hard limit during configuration load as it most likely randomly fail.
57 : * So just print WARNLOG every 10s. */
58 : #define RPC_CLIENT_REQUEST_TIMEOUT_US (10U * 1000 * 1000)
59 :
60 : struct load_json_config_ctx {
61 : /* Thread used during configuration. */
62 : struct spdk_thread *thread;
63 : spdk_subsystem_init_fn cb_fn;
64 : void *cb_arg;
65 : bool stop_on_error;
66 :
67 : /* Current subsystem */
68 : struct spdk_json_val *subsystems; /* "subsystems" array */
69 : struct spdk_json_val *subsystems_it; /* current subsystem array position in "subsystems" array */
70 :
71 : struct spdk_json_val *subsystem_name; /* current subsystem name */
72 : char subsystem_name_str[128];
73 :
74 : /* Current "config" entry we are processing */
75 : struct spdk_json_val *config; /* "config" array */
76 : struct spdk_json_val *config_it; /* current config position in "config" array */
77 :
78 : /* Current request id we are sending. */
79 : uint32_t rpc_request_id;
80 :
81 : /* Whole configuration file read and parsed. */
82 : size_t json_data_size;
83 : char *json_data;
84 :
85 : size_t values_cnt;
86 : struct spdk_json_val *values;
87 :
88 : char rpc_socket_path_temp[RPC_SOCKET_PATH_MAX + 1];
89 :
90 : struct spdk_jsonrpc_client *client_conn;
91 : struct spdk_poller *client_conn_poller;
92 :
93 : client_resp_handler client_resp_cb;
94 :
95 : /* Timeout for current RPC client action. */
96 : uint64_t timeout;
97 :
98 : /* Signals that the code should follow deprecated path of execution. */
99 : bool initalize_subsystems;
100 : };
101 :
102 : static void app_json_config_load_subsystem(void *_ctx);
103 :
104 : static void
105 0 : app_json_config_load_done(struct load_json_config_ctx *ctx, int rc)
106 : {
107 0 : spdk_poller_unregister(&ctx->client_conn_poller);
108 0 : if (ctx->client_conn != NULL) {
109 0 : spdk_jsonrpc_client_close(ctx->client_conn);
110 0 : }
111 :
112 0 : spdk_rpc_server_finish(ctx->rpc_socket_path_temp);
113 :
114 0 : SPDK_DEBUG_APP_CFG("Config load finished with rc %d\n", rc);
115 0 : ctx->cb_fn(rc, ctx->cb_arg);
116 :
117 0 : free(ctx->json_data);
118 0 : free(ctx->values);
119 0 : free(ctx);
120 0 : }
121 :
122 : static void
123 0 : rpc_client_set_timeout(struct load_json_config_ctx *ctx, uint64_t timeout_us)
124 : {
125 0 : ctx->timeout = spdk_get_ticks() + timeout_us * spdk_get_ticks_hz() / (1000 * 1000);
126 0 : }
127 :
128 : static int
129 0 : rpc_client_check_timeout(struct load_json_config_ctx *ctx)
130 : {
131 0 : if (ctx->timeout < spdk_get_ticks()) {
132 0 : SPDK_WARNLOG("RPC client command timeout.\n");
133 0 : return -ETIMEDOUT;
134 : }
135 :
136 0 : return 0;
137 0 : }
138 :
139 : struct json_write_buf {
140 : char data[1024];
141 : unsigned cur_off;
142 : };
143 :
144 : static int
145 0 : json_write_stdout(void *cb_ctx, const void *data, size_t size)
146 : {
147 0 : struct json_write_buf *buf = cb_ctx;
148 0 : size_t rc;
149 :
150 0 : rc = snprintf(buf->data + buf->cur_off, sizeof(buf->data) - buf->cur_off,
151 0 : "%s", (const char *)data);
152 0 : if (rc > 0) {
153 0 : buf->cur_off += rc;
154 0 : }
155 0 : return rc == size ? 0 : -1;
156 0 : }
157 :
158 : static int
159 0 : rpc_client_poller(void *arg)
160 : {
161 0 : struct load_json_config_ctx *ctx = arg;
162 0 : struct spdk_jsonrpc_client_response *resp;
163 0 : client_resp_handler cb;
164 0 : int rc;
165 :
166 0 : assert(spdk_get_thread() == ctx->thread);
167 :
168 0 : rc = spdk_jsonrpc_client_poll(ctx->client_conn, 0);
169 0 : if (rc == 0) {
170 0 : rc = rpc_client_check_timeout(ctx);
171 0 : if (rc == -ETIMEDOUT) {
172 0 : rpc_client_set_timeout(ctx, RPC_CLIENT_REQUEST_TIMEOUT_US);
173 0 : rc = 0;
174 0 : }
175 0 : }
176 :
177 0 : if (rc == 0) {
178 : /* No response yet */
179 0 : return SPDK_POLLER_BUSY;
180 0 : } else if (rc < 0) {
181 0 : app_json_config_load_done(ctx, rc);
182 0 : return SPDK_POLLER_BUSY;
183 : }
184 :
185 0 : resp = spdk_jsonrpc_client_get_response(ctx->client_conn);
186 0 : assert(resp);
187 :
188 0 : if (resp->error) {
189 0 : struct json_write_buf buf = {};
190 0 : struct spdk_json_write_ctx *w = spdk_json_write_begin(json_write_stdout,
191 : &buf, SPDK_JSON_PARSE_FLAG_DECODE_IN_PLACE);
192 :
193 0 : if (w == NULL) {
194 0 : SPDK_ERRLOG("error response: (?)\n");
195 0 : } else {
196 0 : spdk_json_write_val(w, resp->error);
197 0 : spdk_json_write_end(w);
198 0 : SPDK_ERRLOG("error response: \n%s\n", buf.data);
199 : }
200 0 : }
201 :
202 0 : if (resp->error && ctx->stop_on_error) {
203 0 : spdk_jsonrpc_client_free_response(resp);
204 0 : app_json_config_load_done(ctx, -EINVAL);
205 0 : } else {
206 : /* We have response so we must have callback for it. */
207 0 : cb = ctx->client_resp_cb;
208 0 : assert(cb != NULL);
209 :
210 : /* Mark we are done with this handler. */
211 0 : ctx->client_resp_cb = NULL;
212 0 : cb(ctx, resp);
213 : }
214 :
215 :
216 0 : return SPDK_POLLER_BUSY;
217 0 : }
218 :
219 : static int
220 0 : rpc_client_connect_poller(void *_ctx)
221 : {
222 0 : struct load_json_config_ctx *ctx = _ctx;
223 0 : int rc;
224 :
225 0 : rc = spdk_jsonrpc_client_poll(ctx->client_conn, 0);
226 0 : if (rc != -ENOTCONN) {
227 : /* We are connected. Start regular poller and issue first request */
228 0 : spdk_poller_unregister(&ctx->client_conn_poller);
229 0 : ctx->client_conn_poller = SPDK_POLLER_REGISTER(rpc_client_poller, ctx, 100);
230 0 : app_json_config_load_subsystem(ctx);
231 0 : } else {
232 0 : rc = rpc_client_check_timeout(ctx);
233 0 : if (rc) {
234 0 : app_json_config_load_done(ctx, rc);
235 0 : }
236 :
237 0 : return SPDK_POLLER_IDLE;
238 : }
239 :
240 0 : return SPDK_POLLER_BUSY;
241 0 : }
242 :
243 : static int
244 0 : client_send_request(struct load_json_config_ctx *ctx, struct spdk_jsonrpc_client_request *request,
245 : client_resp_handler client_resp_cb)
246 : {
247 0 : int rc;
248 :
249 0 : assert(spdk_get_thread() == ctx->thread);
250 :
251 0 : ctx->client_resp_cb = client_resp_cb;
252 0 : rpc_client_set_timeout(ctx, RPC_CLIENT_REQUEST_TIMEOUT_US);
253 0 : rc = spdk_jsonrpc_client_send_request(ctx->client_conn, request);
254 :
255 0 : if (rc) {
256 0 : SPDK_DEBUG_APP_CFG("Sending request to client failed (%d)\n", rc);
257 0 : }
258 :
259 0 : return rc;
260 0 : }
261 :
262 : static int
263 0 : cap_string(const struct spdk_json_val *val, void *out)
264 : {
265 0 : const struct spdk_json_val **vptr = out;
266 :
267 0 : if (val->type != SPDK_JSON_VAL_STRING) {
268 0 : return -EINVAL;
269 : }
270 :
271 0 : *vptr = val;
272 0 : return 0;
273 0 : }
274 :
275 : static int
276 0 : cap_object(const struct spdk_json_val *val, void *out)
277 : {
278 0 : const struct spdk_json_val **vptr = out;
279 :
280 0 : if (val->type != SPDK_JSON_VAL_OBJECT_BEGIN) {
281 0 : return -EINVAL;
282 : }
283 :
284 0 : *vptr = val;
285 0 : return 0;
286 0 : }
287 :
288 :
289 : static int
290 0 : cap_array_or_null(const struct spdk_json_val *val, void *out)
291 : {
292 0 : const struct spdk_json_val **vptr = out;
293 :
294 0 : if (val->type != SPDK_JSON_VAL_ARRAY_BEGIN && val->type != SPDK_JSON_VAL_NULL) {
295 0 : return -EINVAL;
296 : }
297 :
298 0 : *vptr = val;
299 0 : return 0;
300 0 : }
301 :
302 : struct config_entry {
303 : char *method;
304 : struct spdk_json_val *params;
305 : };
306 :
307 : static struct spdk_json_object_decoder jsonrpc_cmd_decoders[] = {
308 : {"method", offsetof(struct config_entry, method), spdk_json_decode_string},
309 : {"params", offsetof(struct config_entry, params), cap_object, true}
310 : };
311 :
312 : static void app_json_config_load_subsystem_config_entry(void *_ctx);
313 :
314 : static void
315 0 : app_json_config_load_subsystem_config_entry_next(struct load_json_config_ctx *ctx,
316 : struct spdk_jsonrpc_client_response *resp)
317 : {
318 : /* Don't care about the response */
319 0 : spdk_jsonrpc_client_free_response(resp);
320 :
321 0 : ctx->config_it = spdk_json_next(ctx->config_it);
322 0 : app_json_config_load_subsystem_config_entry(ctx);
323 0 : }
324 :
325 : /* Load "config" entry */
326 : static void
327 0 : app_json_config_load_subsystem_config_entry(void *_ctx)
328 : {
329 0 : struct load_json_config_ctx *ctx = _ctx;
330 0 : struct spdk_jsonrpc_client_request *rpc_request;
331 0 : struct spdk_json_write_ctx *w;
332 0 : struct config_entry cfg = {};
333 0 : struct spdk_json_val *params_end;
334 0 : size_t params_len = 0;
335 0 : uint32_t state_mask = 0, cur_state_mask, startup_runtime = SPDK_RPC_STARTUP | SPDK_RPC_RUNTIME;
336 0 : int rc;
337 :
338 0 : if (ctx->config_it == NULL) {
339 0 : SPDK_DEBUG_APP_CFG("Subsystem '%.*s': configuration done.\n", ctx->subsystem_name->len,
340 : (char *)ctx->subsystem_name->start);
341 0 : ctx->subsystems_it = spdk_json_next(ctx->subsystems_it);
342 : /* Invoke later to avoid recursion */
343 0 : spdk_thread_send_msg(ctx->thread, app_json_config_load_subsystem, ctx);
344 0 : return;
345 : }
346 :
347 0 : if (spdk_json_decode_object(ctx->config_it, jsonrpc_cmd_decoders,
348 : SPDK_COUNTOF(jsonrpc_cmd_decoders), &cfg)) {
349 0 : SPDK_ERRLOG("Failed to decode config entry\n");
350 0 : app_json_config_load_done(ctx, -EINVAL);
351 0 : goto out;
352 : }
353 :
354 0 : rc = spdk_rpc_get_method_state_mask(cfg.method, &state_mask);
355 0 : if (rc == -ENOENT) {
356 0 : if (!ctx->stop_on_error) {
357 : /* Invoke later to avoid recursion */
358 0 : ctx->config_it = spdk_json_next(ctx->config_it);
359 0 : spdk_thread_send_msg(ctx->thread, app_json_config_load_subsystem_config_entry, ctx);
360 0 : } else if (!spdk_subsystem_exists(ctx->subsystem_name_str)) {
361 : /* If the subsystem does not exist, just skip it, even
362 : * if we are supposed to stop_on_error. Users may generate
363 : * a JSON config from one application, and want to use parts
364 : * of it in another application that may not have all of the
365 : * same subsystems linked - for example, nvmf_tgt => bdevperf.
366 : * That's OK, we don't need to throw an error, since any nvmf
367 : * configuration wouldn't be used by bdevperf anyways. That is
368 : * different than if some subsystem does exist in bdevperf and
369 : * one of its RPCs fails.
370 : */
371 0 : SPDK_NOTICELOG("Skipping method '%s' because its subsystem '%s' "
372 : "is not linked into this application.\n",
373 : cfg.method, ctx->subsystem_name_str);
374 : /* Invoke later to avoid recursion */
375 0 : ctx->config_it = spdk_json_next(ctx->config_it);
376 0 : spdk_thread_send_msg(ctx->thread, app_json_config_load_subsystem_config_entry, ctx);
377 0 : } else {
378 0 : SPDK_ERRLOG("Method '%s' was not found\n", cfg.method);
379 0 : app_json_config_load_done(ctx, rc);
380 : }
381 0 : goto out;
382 : }
383 0 : cur_state_mask = spdk_rpc_get_state();
384 0 : if ((state_mask & cur_state_mask) != cur_state_mask) {
385 0 : SPDK_DEBUG_APP_CFG("Method '%s' not allowed -> skipping\n", cfg.method);
386 : /* Invoke later to avoid recursion */
387 0 : ctx->config_it = spdk_json_next(ctx->config_it);
388 0 : spdk_thread_send_msg(ctx->thread, app_json_config_load_subsystem_config_entry, ctx);
389 0 : goto out;
390 : }
391 0 : if ((state_mask & startup_runtime) == startup_runtime && cur_state_mask == SPDK_RPC_RUNTIME) {
392 : /* Some methods are allowed to be run in both STARTUP and RUNTIME states.
393 : * We should not call such methods twice, so ignore the second attempt in RUNTIME state */
394 0 : SPDK_DEBUG_APP_CFG("Method '%s' has already been run in STARTUP state\n", cfg.method);
395 : /* Invoke later to avoid recursion */
396 0 : ctx->config_it = spdk_json_next(ctx->config_it);
397 0 : spdk_thread_send_msg(ctx->thread, app_json_config_load_subsystem_config_entry, ctx);
398 0 : goto out;
399 : }
400 :
401 0 : SPDK_DEBUG_APP_CFG("\tmethod: %s\n", cfg.method);
402 :
403 0 : if (cfg.params) {
404 : /* Get _END by skipping params and going back by one element. */
405 0 : params_end = cfg.params + spdk_json_val_len(cfg.params) - 1;
406 :
407 : /* Need to add one character to include '}' */
408 0 : params_len = params_end->start - cfg.params->start + 1;
409 :
410 0 : SPDK_DEBUG_APP_CFG("\tparams: %.*s\n", (int)params_len, (char *)cfg.params->start);
411 0 : }
412 :
413 0 : rpc_request = spdk_jsonrpc_client_create_request();
414 0 : if (!rpc_request) {
415 0 : app_json_config_load_done(ctx, -errno);
416 0 : goto out;
417 : }
418 :
419 0 : w = spdk_jsonrpc_begin_request(rpc_request, ctx->rpc_request_id, NULL);
420 0 : if (!w) {
421 0 : spdk_jsonrpc_client_free_request(rpc_request);
422 0 : app_json_config_load_done(ctx, -ENOMEM);
423 0 : goto out;
424 : }
425 :
426 0 : spdk_json_write_named_string(w, "method", cfg.method);
427 :
428 0 : if (cfg.params) {
429 : /* No need to parse "params". Just dump the whole content of "params"
430 : * directly into the request and let the remote side verify it. */
431 0 : spdk_json_write_name(w, "params");
432 0 : spdk_json_write_val_raw(w, cfg.params->start, params_len);
433 0 : }
434 :
435 0 : spdk_jsonrpc_end_request(rpc_request, w);
436 :
437 0 : rc = client_send_request(ctx, rpc_request, app_json_config_load_subsystem_config_entry_next);
438 0 : if (rc != 0) {
439 0 : app_json_config_load_done(ctx, -rc);
440 0 : goto out;
441 : }
442 : out:
443 0 : free(cfg.method);
444 0 : }
445 :
446 : static void
447 0 : subsystem_init_done(int rc, void *arg1)
448 : {
449 0 : struct load_json_config_ctx *ctx = arg1;
450 :
451 0 : if (rc) {
452 0 : app_json_config_load_done(ctx, rc);
453 0 : return;
454 : }
455 :
456 0 : spdk_rpc_set_state(SPDK_RPC_RUNTIME);
457 : /* Another round. This time for RUNTIME methods */
458 0 : SPDK_DEBUG_APP_CFG("'framework_start_init' done - continuing configuration\n");
459 :
460 0 : assert(ctx != NULL);
461 0 : if (ctx->subsystems) {
462 0 : ctx->subsystems_it = spdk_json_array_first(ctx->subsystems);
463 0 : }
464 :
465 0 : app_json_config_load_subsystem(ctx);
466 0 : }
467 :
468 : static struct spdk_json_object_decoder subsystem_decoders[] = {
469 : {"subsystem", offsetof(struct load_json_config_ctx, subsystem_name), cap_string},
470 : {"config", offsetof(struct load_json_config_ctx, config), cap_array_or_null}
471 : };
472 :
473 : /*
474 : * Start loading subsystem pointed by ctx->subsystems_it. This must point to the
475 : * beginning of the "subsystem" object in "subsystems" array or be NULL. If it is
476 : * NULL then no more subsystems to load.
477 : *
478 : * If "initalize_subsystems" is unset, then the function performs one iteration
479 : * and does not call subsystem initialization.
480 : *
481 : * There are two iterations, when "initalize_subsystems" context flag is set:
482 : *
483 : * In first iteration only STARTUP RPC methods are used, other methods are ignored. When
484 : * allsubsystems are walked the ctx->subsystems_it became NULL and "framework_start_init"
485 : * is called to let the SPDK move to RUNTIME state (initialize all subsystems) and
486 : * second iteration begins.
487 : *
488 : * In second iteration "subsystems" array is walked through again, this time only
489 : * RUNTIME RPC methods are used. When ctx->subsystems_it became NULL second time it
490 : * indicate that there is no more subsystems to load. The cb_fn is called to finish
491 : * configuration.
492 : */
493 : static void
494 0 : app_json_config_load_subsystem(void *_ctx)
495 : {
496 0 : struct load_json_config_ctx *ctx = _ctx;
497 :
498 0 : if (ctx->subsystems_it == NULL) {
499 0 : if (ctx->initalize_subsystems && spdk_rpc_get_state() == SPDK_RPC_STARTUP) {
500 0 : SPDK_DEBUG_APP_CFG("No more entries for current state, calling 'framework_start_init'\n");
501 0 : spdk_subsystem_init(subsystem_init_done, ctx);
502 0 : } else {
503 0 : SPDK_DEBUG_APP_CFG("No more entries for current state\n");
504 0 : app_json_config_load_done(ctx, 0);
505 : }
506 :
507 0 : return;
508 : }
509 :
510 : /* Capture subsystem name and config array */
511 0 : if (spdk_json_decode_object(ctx->subsystems_it, subsystem_decoders,
512 0 : SPDK_COUNTOF(subsystem_decoders), ctx)) {
513 0 : SPDK_ERRLOG("Failed to parse subsystem configuration\n");
514 0 : app_json_config_load_done(ctx, -EINVAL);
515 0 : return;
516 : }
517 :
518 0 : snprintf(ctx->subsystem_name_str, sizeof(ctx->subsystem_name_str),
519 0 : "%.*s", ctx->subsystem_name->len, (char *)ctx->subsystem_name->start);
520 :
521 0 : SPDK_DEBUG_APP_CFG("Loading subsystem '%s' configuration\n", ctx->subsystem_name_str);
522 :
523 : /* Get 'config' array first configuration entry */
524 0 : ctx->config_it = spdk_json_array_first(ctx->config);
525 0 : app_json_config_load_subsystem_config_entry(ctx);
526 0 : }
527 :
528 : static int
529 0 : parse_json(void *json, ssize_t json_size, struct load_json_config_ctx *ctx)
530 : {
531 0 : void *end;
532 0 : ssize_t rc;
533 :
534 0 : if (!json || json_size <= 0) {
535 0 : SPDK_ERRLOG("JSON data cannot be empty\n");
536 0 : goto err;
537 : }
538 :
539 0 : ctx->json_data = calloc(1, json_size);
540 0 : if (!ctx->json_data) {
541 0 : goto err;
542 : }
543 0 : memcpy(ctx->json_data, json, json_size);
544 0 : ctx->json_data_size = json_size;
545 :
546 0 : rc = spdk_json_parse(ctx->json_data, ctx->json_data_size, NULL, 0, &end,
547 : SPDK_JSON_PARSE_FLAG_ALLOW_COMMENTS);
548 0 : if (rc < 0) {
549 0 : SPDK_ERRLOG("Parsing JSON configuration failed (%zd)\n", rc);
550 0 : goto err;
551 : }
552 :
553 0 : ctx->values_cnt = rc;
554 0 : ctx->values = calloc(ctx->values_cnt, sizeof(struct spdk_json_val));
555 0 : if (ctx->values == NULL) {
556 0 : SPDK_ERRLOG("Out of memory\n");
557 0 : goto err;
558 : }
559 :
560 0 : rc = spdk_json_parse(ctx->json_data, ctx->json_data_size, ctx->values,
561 0 : ctx->values_cnt, &end,
562 : SPDK_JSON_PARSE_FLAG_ALLOW_COMMENTS);
563 0 : if ((size_t)rc != ctx->values_cnt) {
564 0 : SPDK_ERRLOG("Parsing JSON configuration failed (%zd)\n", rc);
565 0 : goto err;
566 : }
567 :
568 0 : return 0;
569 : err:
570 0 : free(ctx->values);
571 0 : return -EINVAL;
572 0 : }
573 :
574 : static void
575 0 : json_config_prepare_ctx(spdk_subsystem_init_fn cb_fn, void *cb_arg, bool stop_on_error, void *json,
576 : ssize_t json_size, bool initalize_subsystems)
577 : {
578 0 : struct load_json_config_ctx *ctx = calloc(1, sizeof(*ctx));
579 0 : int rc;
580 :
581 0 : if (!ctx) {
582 0 : cb_fn(-ENOMEM, cb_arg);
583 0 : return;
584 : }
585 :
586 0 : ctx->cb_fn = cb_fn;
587 0 : ctx->cb_arg = cb_arg;
588 0 : ctx->stop_on_error = stop_on_error;
589 0 : ctx->thread = spdk_get_thread();
590 0 : ctx->initalize_subsystems = initalize_subsystems;
591 :
592 0 : rc = parse_json(json, json_size, ctx);
593 0 : if (rc < 0) {
594 0 : goto fail;
595 : }
596 :
597 : /* Capture subsystems array */
598 0 : rc = spdk_json_find_array(ctx->values, "subsystems", NULL, &ctx->subsystems);
599 0 : switch (rc) {
600 : case 0:
601 : /* Get first subsystem */
602 0 : ctx->subsystems_it = spdk_json_array_first(ctx->subsystems);
603 0 : if (ctx->subsystems_it == NULL) {
604 0 : SPDK_NOTICELOG("'subsystems' configuration is empty\n");
605 0 : }
606 0 : break;
607 : case -EPROTOTYPE:
608 0 : SPDK_ERRLOG("Invalid JSON configuration: not enclosed in {}.\n");
609 0 : goto fail;
610 : case -ENOENT:
611 0 : SPDK_WARNLOG("No 'subsystems' key JSON configuration file.\n");
612 0 : break;
613 : case -EDOM:
614 0 : SPDK_ERRLOG("Invalid JSON configuration: 'subsystems' should be an array.\n");
615 0 : goto fail;
616 : default:
617 0 : SPDK_ERRLOG("Failed to parse JSON configuration.\n");
618 0 : goto fail;
619 : }
620 :
621 : /* FIXME: rpc client should use socketpair() instead of this temporary socket nonsense */
622 0 : rc = snprintf(ctx->rpc_socket_path_temp, sizeof(ctx->rpc_socket_path_temp),
623 0 : "%s.%d_%"PRIu64"_config", SPDK_DEFAULT_RPC_ADDR, getpid(), spdk_get_ticks());
624 0 : if (rc >= (int)sizeof(ctx->rpc_socket_path_temp)) {
625 0 : SPDK_ERRLOG("Socket name create failed\n");
626 0 : goto fail;
627 : }
628 :
629 0 : rc = spdk_rpc_initialize(ctx->rpc_socket_path_temp, NULL);
630 0 : if (rc) {
631 0 : goto fail;
632 : }
633 :
634 0 : ctx->client_conn = spdk_jsonrpc_client_connect(ctx->rpc_socket_path_temp, AF_UNIX);
635 0 : if (ctx->client_conn == NULL) {
636 0 : SPDK_ERRLOG("Failed to connect to '%s'\n", ctx->rpc_socket_path_temp);
637 0 : goto fail;
638 : }
639 :
640 0 : rpc_client_set_timeout(ctx, RPC_CLIENT_CONNECT_TIMEOUT_US);
641 0 : ctx->client_conn_poller = SPDK_POLLER_REGISTER(rpc_client_connect_poller, ctx, 100);
642 0 : return;
643 :
644 : fail:
645 0 : app_json_config_load_done(ctx, -EINVAL);
646 0 : }
647 :
648 : void
649 0 : spdk_subsystem_load_config(void *json, ssize_t json_size, spdk_subsystem_init_fn cb_fn,
650 : void *cb_arg, bool stop_on_error)
651 : {
652 0 : assert(cb_fn);
653 0 : json_config_prepare_ctx(cb_fn, cb_arg, stop_on_error, json, json_size, false);
654 0 : }
655 :
656 0 : SPDK_LOG_REGISTER_COMPONENT(app_config)
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