Line data Source code
1 : /* SPDX-License-Identifier: BSD-3-Clause
2 : * Copyright (C) 2008-2012 Daisuke Aoyama <aoyama@peach.ne.jp>.
3 : * Copyright (C) 2016 Intel Corporation.
4 : * All rights reserved.
5 : */
6 :
7 : #include "spdk/stdinc.h"
8 :
9 : #include "spdk/endian.h"
10 : #include "spdk/env.h"
11 : #include "spdk/likely.h"
12 : #include "spdk/thread.h"
13 : #include "spdk/queue.h"
14 : #include "spdk/trace.h"
15 : #include "spdk/sock.h"
16 : #include "spdk/string.h"
17 :
18 : #include "spdk/log.h"
19 :
20 : #include "iscsi/task.h"
21 : #include "iscsi/conn.h"
22 : #include "iscsi/tgt_node.h"
23 : #include "iscsi/portal_grp.h"
24 :
25 : #define MAKE_DIGEST_WORD(BUF, CRC32C) \
26 : ( ((*((uint8_t *)(BUF)+0)) = (uint8_t)((uint32_t)(CRC32C) >> 0)), \
27 : ((*((uint8_t *)(BUF)+1)) = (uint8_t)((uint32_t)(CRC32C) >> 8)), \
28 : ((*((uint8_t *)(BUF)+2)) = (uint8_t)((uint32_t)(CRC32C) >> 16)), \
29 : ((*((uint8_t *)(BUF)+3)) = (uint8_t)((uint32_t)(CRC32C) >> 24)))
30 :
31 : #define SPDK_ISCSI_CONNECTION_MEMSET(conn) \
32 : memset(&(conn)->portal, 0, sizeof(*(conn)) - \
33 : offsetof(struct spdk_iscsi_conn, portal));
34 :
35 : #define SPDK_ISCSI_CONNECTION_STATUS(status, rnstr) case(status): return(rnstr)
36 :
37 : static struct spdk_iscsi_conn *g_conns_array = NULL;
38 :
39 : static TAILQ_HEAD(, spdk_iscsi_conn) g_free_conns = TAILQ_HEAD_INITIALIZER(g_free_conns);
40 : static TAILQ_HEAD(, spdk_iscsi_conn) g_active_conns = TAILQ_HEAD_INITIALIZER(g_active_conns);
41 :
42 : static pthread_mutex_t g_conns_mutex = PTHREAD_MUTEX_INITIALIZER;
43 :
44 : static struct spdk_poller *g_shutdown_timer = NULL;
45 :
46 : static void iscsi_conn_sock_cb(void *arg, struct spdk_sock_group *group,
47 : struct spdk_sock *sock);
48 :
49 : static struct spdk_iscsi_conn *
50 0 : allocate_conn(void)
51 : {
52 : struct spdk_iscsi_conn *conn;
53 :
54 0 : pthread_mutex_lock(&g_conns_mutex);
55 0 : conn = TAILQ_FIRST(&g_free_conns);
56 0 : if (conn != NULL) {
57 0 : assert(!conn->is_valid);
58 0 : TAILQ_REMOVE(&g_free_conns, conn, conn_link);
59 0 : SPDK_ISCSI_CONNECTION_MEMSET(conn);
60 0 : conn->is_valid = 1;
61 :
62 0 : TAILQ_INSERT_TAIL(&g_active_conns, conn, conn_link);
63 : }
64 0 : pthread_mutex_unlock(&g_conns_mutex);
65 :
66 0 : return conn;
67 : }
68 :
69 : static void
70 0 : _free_conn(struct spdk_iscsi_conn *conn)
71 : {
72 0 : TAILQ_REMOVE(&g_active_conns, conn, conn_link);
73 :
74 0 : memset(conn->portal_host, 0, sizeof(conn->portal_host));
75 0 : memset(conn->portal_port, 0, sizeof(conn->portal_port));
76 0 : conn->is_valid = 0;
77 :
78 0 : TAILQ_INSERT_TAIL(&g_free_conns, conn, conn_link);
79 0 : }
80 :
81 : static void
82 0 : free_conn(struct spdk_iscsi_conn *conn)
83 : {
84 0 : pthread_mutex_lock(&g_conns_mutex);
85 0 : _free_conn(conn);
86 0 : pthread_mutex_unlock(&g_conns_mutex);
87 0 : }
88 :
89 : static void
90 0 : _iscsi_conns_cleanup(void)
91 : {
92 0 : free(g_conns_array);
93 0 : }
94 :
95 : int
96 0 : initialize_iscsi_conns(void)
97 : {
98 : uint32_t i;
99 :
100 0 : SPDK_DEBUGLOG(iscsi, "spdk_iscsi_init\n");
101 :
102 0 : g_conns_array = calloc(MAX_ISCSI_CONNECTIONS, sizeof(struct spdk_iscsi_conn));
103 0 : if (g_conns_array == NULL) {
104 0 : return -ENOMEM;
105 : }
106 :
107 0 : for (i = 0; i < MAX_ISCSI_CONNECTIONS; i++) {
108 0 : g_conns_array[i].id = i;
109 0 : TAILQ_INSERT_TAIL(&g_free_conns, &g_conns_array[i], conn_link);
110 : }
111 :
112 0 : return 0;
113 : }
114 :
115 : static void
116 0 : iscsi_poll_group_add_conn(struct spdk_iscsi_poll_group *pg, struct spdk_iscsi_conn *conn)
117 : {
118 : int rc;
119 :
120 0 : rc = spdk_sock_group_add_sock(pg->sock_group, conn->sock, iscsi_conn_sock_cb, conn);
121 0 : if (rc < 0) {
122 0 : SPDK_ERRLOG("Failed to add sock=%p of conn=%p\n", conn->sock, conn);
123 0 : return;
124 : }
125 :
126 0 : conn->is_stopped = false;
127 0 : STAILQ_INSERT_TAIL(&pg->connections, conn, pg_link);
128 : }
129 :
130 : static void
131 0 : iscsi_poll_group_remove_conn(struct spdk_iscsi_poll_group *pg, struct spdk_iscsi_conn *conn)
132 : {
133 : int rc;
134 :
135 0 : assert(conn->sock != NULL);
136 0 : rc = spdk_sock_group_remove_sock(pg->sock_group, conn->sock);
137 0 : if (rc < 0) {
138 0 : SPDK_ERRLOG("Failed to remove sock=%p of conn=%p\n", conn->sock, conn);
139 : }
140 :
141 0 : conn->is_stopped = true;
142 0 : STAILQ_REMOVE(&pg->connections, conn, spdk_iscsi_conn, pg_link);
143 0 : }
144 :
145 : static int
146 0 : login_timeout(void *arg)
147 : {
148 0 : struct spdk_iscsi_conn *conn = arg;
149 :
150 0 : if (conn->state < ISCSI_CONN_STATE_EXITING) {
151 0 : conn->state = ISCSI_CONN_STATE_EXITING;
152 : }
153 0 : spdk_poller_unregister(&conn->login_timer);
154 :
155 0 : return SPDK_POLLER_BUSY;
156 : }
157 :
158 : static void
159 0 : iscsi_conn_start(void *ctx)
160 : {
161 0 : struct spdk_iscsi_conn *conn = ctx;
162 :
163 0 : iscsi_poll_group_add_conn(conn->pg, conn);
164 :
165 0 : conn->login_timer = SPDK_POLLER_REGISTER(login_timeout, conn, ISCSI_LOGIN_TIMEOUT * 1000000);
166 0 : }
167 :
168 : int
169 0 : iscsi_conn_construct(struct spdk_iscsi_portal *portal,
170 : struct spdk_sock *sock)
171 : {
172 : struct spdk_iscsi_poll_group *pg;
173 : struct spdk_iscsi_conn *conn;
174 : int i, rc;
175 :
176 0 : conn = allocate_conn();
177 0 : if (conn == NULL) {
178 0 : SPDK_ERRLOG("Could not allocate connection.\n");
179 0 : return -1;
180 : }
181 :
182 0 : pthread_mutex_lock(&g_iscsi.mutex);
183 0 : conn->timeout = g_iscsi.timeout * spdk_get_ticks_hz(); /* seconds to TSC */
184 0 : conn->nopininterval = g_iscsi.nopininterval;
185 0 : conn->nopininterval *= spdk_get_ticks_hz(); /* seconds to TSC */
186 0 : conn->last_nopin = spdk_get_ticks();
187 0 : conn->nop_outstanding = false;
188 0 : conn->data_out_cnt = 0;
189 0 : conn->data_in_cnt = 0;
190 0 : conn->disable_chap = portal->group->disable_chap;
191 0 : conn->require_chap = portal->group->require_chap;
192 0 : conn->mutual_chap = portal->group->mutual_chap;
193 0 : conn->chap_group = portal->group->chap_group;
194 0 : pthread_mutex_unlock(&g_iscsi.mutex);
195 0 : conn->MaxRecvDataSegmentLength = 8192; /* RFC3720(12.12) */
196 :
197 0 : conn->portal = portal;
198 0 : conn->pg_tag = portal->group->tag;
199 0 : memcpy(conn->portal_host, portal->host, strlen(portal->host));
200 0 : memcpy(conn->portal_port, portal->port, strlen(portal->port));
201 0 : conn->sock = sock;
202 :
203 0 : conn->state = ISCSI_CONN_STATE_INVALID;
204 0 : conn->login_phase = ISCSI_SECURITY_NEGOTIATION_PHASE;
205 0 : conn->ttt = 0;
206 :
207 0 : conn->partial_text_parameter = NULL;
208 :
209 0 : for (i = 0; i < MAX_CONNECTION_PARAMS; i++) {
210 0 : conn->conn_param_state_negotiated[i] = false;
211 : }
212 :
213 0 : for (i = 0; i < MAX_SESSION_PARAMS; i++) {
214 0 : conn->sess_param_state_negotiated[i] = false;
215 : }
216 :
217 0 : conn->pdu_recv_state = ISCSI_PDU_RECV_STATE_AWAIT_PDU_READY;
218 :
219 0 : TAILQ_INIT(&conn->write_pdu_list);
220 0 : TAILQ_INIT(&conn->snack_pdu_list);
221 0 : TAILQ_INIT(&conn->queued_r2t_tasks);
222 0 : TAILQ_INIT(&conn->active_r2t_tasks);
223 0 : TAILQ_INIT(&conn->queued_datain_tasks);
224 0 : TAILQ_INIT(&conn->luns);
225 :
226 0 : rc = spdk_sock_getaddr(sock, conn->target_addr, sizeof conn->target_addr, NULL,
227 0 : conn->initiator_addr, sizeof conn->initiator_addr, NULL);
228 0 : if (rc < 0) {
229 0 : SPDK_ERRLOG("spdk_sock_getaddr() failed\n");
230 0 : goto error_return;
231 : }
232 :
233 : /* set low water mark */
234 0 : rc = spdk_sock_set_recvlowat(conn->sock, 1);
235 0 : if (rc != 0) {
236 0 : SPDK_ERRLOG("spdk_sock_set_recvlowat() failed\n");
237 0 : goto error_return;
238 : }
239 :
240 : /* set default params */
241 0 : rc = iscsi_conn_params_init(&conn->params);
242 0 : if (rc < 0) {
243 0 : SPDK_ERRLOG("iscsi_conn_params_init() failed\n");
244 0 : goto error_return;
245 : }
246 0 : conn->logout_request_timer = NULL;
247 0 : conn->logout_timer = NULL;
248 0 : conn->shutdown_timer = NULL;
249 0 : SPDK_DEBUGLOG(iscsi, "Launching connection on acceptor thread\n");
250 0 : conn->pending_task_cnt = 0;
251 :
252 : /* Get the first poll group. */
253 0 : pg = TAILQ_FIRST(&g_iscsi.poll_group_head);
254 0 : if (pg == NULL) {
255 0 : SPDK_ERRLOG("There is no poll group.\n");
256 0 : assert(false);
257 : goto error_return;
258 : }
259 :
260 0 : conn->pg = pg;
261 0 : spdk_thread_send_msg(spdk_io_channel_get_thread(spdk_io_channel_from_ctx(pg)),
262 : iscsi_conn_start, conn);
263 0 : return 0;
264 :
265 0 : error_return:
266 0 : iscsi_param_free(conn->params);
267 0 : free_conn(conn);
268 0 : return -1;
269 : }
270 :
271 : void
272 10 : iscsi_conn_free_pdu(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *pdu)
273 : {
274 : iscsi_conn_xfer_complete_cb cb_fn;
275 : void *cb_arg;
276 :
277 10 : cb_fn = pdu->cb_fn;
278 10 : cb_arg = pdu->cb_arg;
279 :
280 10 : assert(cb_fn != NULL);
281 10 : pdu->cb_fn = NULL;
282 :
283 10 : if (pdu->task) {
284 9 : iscsi_task_put(pdu->task);
285 : }
286 10 : iscsi_put_pdu(pdu);
287 :
288 10 : cb_fn(cb_arg);
289 10 : }
290 :
291 : static int
292 4 : iscsi_conn_free_tasks(struct spdk_iscsi_conn *conn)
293 : {
294 : struct spdk_iscsi_pdu *pdu, *tmp_pdu;
295 : struct spdk_iscsi_task *iscsi_task, *tmp_iscsi_task;
296 :
297 7 : TAILQ_FOREACH_SAFE(pdu, &conn->snack_pdu_list, tailq, tmp_pdu) {
298 3 : TAILQ_REMOVE(&conn->snack_pdu_list, pdu, tailq);
299 3 : iscsi_conn_free_pdu(conn, pdu);
300 : }
301 :
302 10 : TAILQ_FOREACH_SAFE(iscsi_task, &conn->queued_datain_tasks, link, tmp_iscsi_task) {
303 6 : if (!iscsi_task->is_queued) {
304 5 : TAILQ_REMOVE(&conn->queued_datain_tasks, iscsi_task, link);
305 5 : iscsi_task_put(iscsi_task);
306 : }
307 : }
308 :
309 : /* We have to parse conn->write_pdu_list in the end. In iscsi_conn_free_pdu(),
310 : * iscsi_conn_handle_queued_datain_tasks() may be called, and
311 : * iscsi_conn_handle_queued_datain_tasks() will parse conn->queued_datain_tasks
312 : * and may stack some PDUs to conn->write_pdu_list. Hence when we come here, we
313 : * have to ensure there is no associated task in conn->queued_datain_tasks.
314 : */
315 11 : TAILQ_FOREACH_SAFE(pdu, &conn->write_pdu_list, tailq, tmp_pdu) {
316 7 : TAILQ_REMOVE(&conn->write_pdu_list, pdu, tailq);
317 7 : iscsi_conn_free_pdu(conn, pdu);
318 : }
319 :
320 4 : if (conn->pending_task_cnt) {
321 0 : return -1;
322 : }
323 :
324 4 : return 0;
325 : }
326 :
327 : static void
328 0 : iscsi_conn_cleanup_backend(struct spdk_iscsi_conn *conn)
329 : {
330 : int rc;
331 : struct spdk_iscsi_tgt_node *target;
332 :
333 0 : if (conn->sess->connections > 1) {
334 : /* connection specific cleanup */
335 0 : } else if (!g_iscsi.AllowDuplicateIsid) {
336 : /*
337 : * a> a target is connected by a single initiator, cleanup backend cancels inflight
338 : * IOs and the resources (of this initiator) are reclaimed as soon as possible.
339 : * b> a target is connected by multiple initiators, one of these initiators
340 : * disconnects with inflight IOs, resetting backend bdev leads all the inflight
341 : * IOs (of multiple initiators) aborted. In this scenario, drain inflight IOs of
342 : * the disconnected initiator instead.
343 : */
344 0 : target = conn->sess->target;
345 0 : if (target != NULL && iscsi_get_active_conns(target) == 1) {
346 0 : rc = iscsi_tgt_node_cleanup_luns(conn, target);
347 0 : if (rc < 0) {
348 0 : SPDK_ERRLOG("target abort failed\n");
349 : }
350 : }
351 : }
352 0 : }
353 :
354 : static void
355 0 : iscsi_conn_free(struct spdk_iscsi_conn *conn)
356 : {
357 : struct spdk_iscsi_sess *sess;
358 : int idx;
359 : uint32_t i;
360 :
361 0 : pthread_mutex_lock(&g_conns_mutex);
362 :
363 0 : if (conn->sess == NULL) {
364 0 : goto end;
365 : }
366 :
367 0 : idx = -1;
368 0 : sess = conn->sess;
369 0 : conn->sess = NULL;
370 :
371 0 : for (i = 0; i < sess->connections; i++) {
372 0 : if (sess->conns[i] == conn) {
373 0 : idx = i;
374 0 : break;
375 : }
376 : }
377 :
378 0 : if (idx < 0) {
379 0 : SPDK_ERRLOG("remove conn not found\n");
380 : } else {
381 0 : for (i = idx; i < sess->connections - 1; i++) {
382 0 : sess->conns[i] = sess->conns[i + 1];
383 : }
384 0 : sess->conns[sess->connections - 1] = NULL;
385 0 : sess->connections--;
386 :
387 0 : if (sess->connections == 0) {
388 : /* cleanup last connection */
389 0 : SPDK_DEBUGLOG(iscsi,
390 : "cleanup last conn free sess\n");
391 0 : iscsi_free_sess(sess);
392 : }
393 : }
394 :
395 0 : SPDK_DEBUGLOG(iscsi, "Terminating connections(tsih %d): %d\n",
396 : sess->tsih, sess->connections);
397 :
398 0 : end:
399 0 : SPDK_DEBUGLOG(iscsi, "cleanup free conn\n");
400 0 : iscsi_param_free(conn->params);
401 0 : _free_conn(conn);
402 :
403 0 : pthread_mutex_unlock(&g_conns_mutex);
404 0 : }
405 :
406 : static void
407 0 : iscsi_conn_close_lun(struct spdk_iscsi_conn *conn,
408 : struct spdk_iscsi_lun *iscsi_lun)
409 : {
410 0 : if (iscsi_lun == NULL) {
411 0 : return;
412 : }
413 :
414 0 : spdk_scsi_lun_free_io_channel(iscsi_lun->desc);
415 0 : spdk_scsi_lun_close(iscsi_lun->desc);
416 0 : spdk_poller_unregister(&iscsi_lun->remove_poller);
417 :
418 0 : TAILQ_REMOVE(&conn->luns, iscsi_lun, tailq);
419 :
420 0 : free(iscsi_lun);
421 :
422 : }
423 :
424 : static void
425 0 : iscsi_conn_close_luns(struct spdk_iscsi_conn *conn)
426 : {
427 : struct spdk_iscsi_lun *iscsi_lun, *tmp;
428 :
429 0 : TAILQ_FOREACH_SAFE(iscsi_lun, &conn->luns, tailq, tmp) {
430 0 : iscsi_conn_close_lun(conn, iscsi_lun);
431 : }
432 0 : }
433 :
434 : static bool
435 0 : iscsi_conn_check_tasks_for_lun(struct spdk_iscsi_conn *conn,
436 : struct spdk_scsi_lun *lun)
437 : {
438 : struct spdk_iscsi_pdu *pdu, *tmp_pdu;
439 : struct spdk_iscsi_task *task;
440 :
441 0 : assert(lun != NULL);
442 :
443 : /* We can remove deferred PDUs safely because they are already flushed. */
444 0 : TAILQ_FOREACH_SAFE(pdu, &conn->snack_pdu_list, tailq, tmp_pdu) {
445 0 : if (lun == pdu->task->scsi.lun) {
446 0 : TAILQ_REMOVE(&conn->snack_pdu_list, pdu, tailq);
447 0 : iscsi_conn_free_pdu(conn, pdu);
448 : }
449 : }
450 :
451 0 : TAILQ_FOREACH(task, &conn->queued_datain_tasks, link) {
452 0 : if (lun == task->scsi.lun) {
453 0 : return false;
454 : }
455 : }
456 :
457 : /* This check loop works even when connection exits in the middle of LUN hotplug
458 : * because all PDUs in write_pdu_list are removed in iscsi_conn_free_tasks().
459 : */
460 0 : TAILQ_FOREACH(pdu, &conn->write_pdu_list, tailq) {
461 0 : if (pdu->task && lun == pdu->task->scsi.lun) {
462 0 : return false;
463 : }
464 : }
465 :
466 0 : return true;
467 : }
468 :
469 : static int
470 0 : iscsi_conn_remove_lun(void *ctx)
471 : {
472 0 : struct spdk_iscsi_lun *iscsi_lun = ctx;
473 0 : struct spdk_iscsi_conn *conn = iscsi_lun->conn;
474 0 : struct spdk_scsi_lun *lun = iscsi_lun->lun;
475 :
476 0 : if (!iscsi_conn_check_tasks_for_lun(conn, lun)) {
477 0 : return SPDK_POLLER_BUSY;
478 : }
479 0 : iscsi_conn_close_lun(conn, iscsi_lun);
480 0 : return SPDK_POLLER_BUSY;
481 : }
482 :
483 : static void
484 0 : _iscsi_conn_hotremove_lun(void *ctx)
485 : {
486 0 : struct spdk_iscsi_lun *iscsi_lun = ctx;
487 0 : struct spdk_iscsi_conn *conn = iscsi_lun->conn;
488 0 : struct spdk_scsi_lun *lun = iscsi_lun->lun;
489 :
490 0 : assert(spdk_io_channel_get_thread(spdk_io_channel_from_ctx(conn->pg)) ==
491 : spdk_get_thread());
492 :
493 : /* If a connection is already in stating status, just return */
494 0 : if (conn->state >= ISCSI_CONN_STATE_EXITING) {
495 0 : return;
496 : }
497 :
498 0 : iscsi_clear_all_transfer_task(conn, lun, NULL);
499 :
500 0 : iscsi_lun->remove_poller = SPDK_POLLER_REGISTER(iscsi_conn_remove_lun, iscsi_lun,
501 : 1000);
502 : }
503 :
504 : static void
505 0 : iscsi_conn_hotremove_lun(struct spdk_scsi_lun *lun, void *remove_ctx)
506 : {
507 0 : struct spdk_iscsi_lun *iscsi_lun = remove_ctx;
508 0 : struct spdk_iscsi_conn *conn = iscsi_lun->conn;
509 :
510 0 : spdk_thread_send_msg(spdk_io_channel_get_thread(spdk_io_channel_from_ctx(conn->pg)),
511 : _iscsi_conn_hotremove_lun, iscsi_lun);
512 0 : }
513 :
514 : static int
515 0 : iscsi_conn_open_lun(struct spdk_iscsi_conn *conn, struct spdk_scsi_lun *lun)
516 : {
517 : int rc;
518 : struct spdk_iscsi_lun *iscsi_lun;
519 :
520 0 : iscsi_lun = calloc(1, sizeof(*iscsi_lun));
521 0 : if (iscsi_lun == NULL) {
522 0 : return -ENOMEM;
523 : }
524 :
525 0 : iscsi_lun->conn = conn;
526 0 : iscsi_lun->lun = lun;
527 :
528 0 : rc = spdk_scsi_lun_open(lun, iscsi_conn_hotremove_lun, iscsi_lun, &iscsi_lun->desc);
529 0 : if (rc != 0) {
530 0 : free(iscsi_lun);
531 0 : return rc;
532 : }
533 :
534 0 : rc = spdk_scsi_lun_allocate_io_channel(iscsi_lun->desc);
535 0 : if (rc != 0) {
536 0 : spdk_scsi_lun_close(iscsi_lun->desc);
537 0 : free(iscsi_lun);
538 0 : return rc;
539 : }
540 :
541 0 : TAILQ_INSERT_TAIL(&conn->luns, iscsi_lun, tailq);
542 :
543 0 : return 0;
544 : }
545 :
546 : static int
547 0 : iscsi_conn_open_luns(struct spdk_iscsi_conn *conn)
548 : {
549 : int rc;
550 : struct spdk_scsi_lun *lun;
551 :
552 0 : for (lun = spdk_scsi_dev_get_first_lun(conn->dev); lun != NULL;
553 0 : lun = spdk_scsi_dev_get_next_lun(lun)) {
554 0 : rc = iscsi_conn_open_lun(conn, lun);
555 0 : if (rc != 0) {
556 0 : goto error;
557 : }
558 : }
559 :
560 0 : return 0;
561 :
562 0 : error:
563 0 : iscsi_conn_close_luns(conn);
564 0 : return -1;
565 : }
566 :
567 : /**
568 : * This function will stop executing the specified connection.
569 : */
570 : static void
571 0 : iscsi_conn_stop(struct spdk_iscsi_conn *conn)
572 : {
573 : struct spdk_iscsi_tgt_node *target;
574 :
575 0 : assert(conn->state == ISCSI_CONN_STATE_EXITED);
576 0 : assert(conn->data_in_cnt == 0);
577 0 : assert(conn->data_out_cnt == 0);
578 :
579 0 : if (conn->sess != NULL &&
580 0 : conn->sess->session_type == SESSION_TYPE_NORMAL &&
581 0 : conn->full_feature) {
582 0 : target = conn->sess->target;
583 0 : pthread_mutex_lock(&target->mutex);
584 0 : target->num_active_conns--;
585 0 : pthread_mutex_unlock(&target->mutex);
586 :
587 0 : iscsi_conn_close_luns(conn);
588 : }
589 :
590 0 : assert(spdk_io_channel_get_thread(spdk_io_channel_from_ctx(conn->pg)) ==
591 : spdk_get_thread());
592 0 : }
593 :
594 : static int
595 0 : _iscsi_conn_check_shutdown(void *arg)
596 : {
597 0 : struct spdk_iscsi_conn *conn = arg;
598 : int rc;
599 :
600 0 : rc = iscsi_conn_free_tasks(conn);
601 0 : if (rc < 0) {
602 0 : return SPDK_POLLER_BUSY;
603 : }
604 :
605 0 : spdk_poller_unregister(&conn->shutdown_timer);
606 :
607 0 : iscsi_conn_stop(conn);
608 0 : iscsi_conn_free(conn);
609 :
610 0 : return SPDK_POLLER_BUSY;
611 : }
612 :
613 : static void
614 0 : _iscsi_conn_destruct(struct spdk_iscsi_conn *conn)
615 : {
616 : int rc;
617 :
618 0 : iscsi_poll_group_remove_conn(conn->pg, conn);
619 0 : spdk_sock_close(&conn->sock);
620 0 : iscsi_clear_all_transfer_task(conn, NULL, NULL);
621 0 : spdk_poller_unregister(&conn->logout_request_timer);
622 0 : spdk_poller_unregister(&conn->logout_timer);
623 0 : spdk_poller_unregister(&conn->login_timer);
624 :
625 0 : rc = iscsi_conn_free_tasks(conn);
626 0 : if (rc < 0) {
627 : /* The connection cannot be freed yet. Check back later. */
628 0 : conn->shutdown_timer = SPDK_POLLER_REGISTER(_iscsi_conn_check_shutdown, conn, 1000);
629 : } else {
630 0 : iscsi_conn_stop(conn);
631 0 : iscsi_conn_free(conn);
632 : }
633 0 : }
634 :
635 : static int
636 0 : _iscsi_conn_check_pending_tasks(void *arg)
637 : {
638 0 : struct spdk_iscsi_conn *conn = arg;
639 :
640 0 : if (conn->dev != NULL &&
641 0 : spdk_scsi_dev_has_pending_tasks(conn->dev, conn->initiator_port)) {
642 0 : return SPDK_POLLER_BUSY;
643 : }
644 :
645 0 : spdk_poller_unregister(&conn->shutdown_timer);
646 :
647 0 : _iscsi_conn_destruct(conn);
648 :
649 0 : return SPDK_POLLER_BUSY;
650 : }
651 :
652 : void
653 0 : iscsi_conn_destruct(struct spdk_iscsi_conn *conn)
654 : {
655 : struct spdk_iscsi_pdu *pdu;
656 : struct spdk_iscsi_task *task;
657 : int opcode;
658 :
659 : /* If a connection is already in exited status, just return */
660 0 : if (conn->state >= ISCSI_CONN_STATE_EXITED) {
661 0 : return;
662 : }
663 :
664 0 : conn->state = ISCSI_CONN_STATE_EXITED;
665 :
666 : /*
667 : * Each connection pre-allocates its next PDU - make sure these get
668 : * freed here.
669 : */
670 0 : pdu = conn->pdu_in_progress;
671 0 : if (pdu) {
672 : /* remove the task left in the PDU too. */
673 0 : task = pdu->task;
674 0 : if (task) {
675 0 : opcode = pdu->bhs.opcode;
676 0 : switch (opcode) {
677 0 : case ISCSI_OP_SCSI:
678 : case ISCSI_OP_SCSI_DATAOUT:
679 0 : spdk_scsi_task_process_abort(&task->scsi);
680 0 : iscsi_task_cpl(&task->scsi);
681 0 : break;
682 0 : default:
683 0 : SPDK_ERRLOG("unexpected opcode %x\n", opcode);
684 0 : iscsi_task_put(task);
685 0 : break;
686 : }
687 0 : }
688 0 : iscsi_put_pdu(pdu);
689 0 : conn->pdu_in_progress = NULL;
690 : }
691 :
692 0 : if (conn->sess != NULL && conn->pending_task_cnt > 0) {
693 0 : iscsi_conn_cleanup_backend(conn);
694 : }
695 :
696 0 : if (conn->dev != NULL &&
697 0 : spdk_scsi_dev_has_pending_tasks(conn->dev, conn->initiator_port)) {
698 0 : conn->shutdown_timer = SPDK_POLLER_REGISTER(_iscsi_conn_check_pending_tasks, conn, 1000);
699 : } else {
700 0 : _iscsi_conn_destruct(conn);
701 : }
702 : }
703 :
704 : int
705 0 : iscsi_get_active_conns(struct spdk_iscsi_tgt_node *target)
706 : {
707 : struct spdk_iscsi_conn *conn;
708 0 : int num = 0;
709 :
710 0 : if (g_conns_array == MAP_FAILED) {
711 0 : return 0;
712 : }
713 :
714 0 : pthread_mutex_lock(&g_conns_mutex);
715 0 : TAILQ_FOREACH(conn, &g_active_conns, conn_link) {
716 0 : if (target == NULL || conn->target == target) {
717 0 : num++;
718 : }
719 : }
720 0 : pthread_mutex_unlock(&g_conns_mutex);
721 0 : return num;
722 : }
723 :
724 : static void
725 0 : iscsi_conn_check_shutdown_cb(void *arg1)
726 : {
727 0 : _iscsi_conns_cleanup();
728 0 : shutdown_iscsi_conns_done();
729 0 : }
730 :
731 : static int
732 0 : iscsi_conn_check_shutdown(void *arg)
733 : {
734 0 : if (iscsi_get_active_conns(NULL) != 0) {
735 0 : return SPDK_POLLER_BUSY;
736 : }
737 :
738 0 : spdk_poller_unregister(&g_shutdown_timer);
739 :
740 0 : spdk_thread_send_msg(spdk_get_thread(), iscsi_conn_check_shutdown_cb, NULL);
741 :
742 0 : return SPDK_POLLER_BUSY;
743 : }
744 :
745 : static void
746 0 : iscsi_send_logout_request(struct spdk_iscsi_conn *conn)
747 : {
748 : struct spdk_iscsi_pdu *rsp_pdu;
749 : struct iscsi_bhs_async *rsph;
750 :
751 0 : rsp_pdu = iscsi_get_pdu(conn);
752 0 : assert(rsp_pdu != NULL);
753 :
754 0 : rsph = (struct iscsi_bhs_async *)&rsp_pdu->bhs;
755 0 : rsp_pdu->data = NULL;
756 :
757 0 : rsph->opcode = ISCSI_OP_ASYNC;
758 0 : to_be32(&rsph->ffffffff, 0xFFFFFFFF);
759 0 : rsph->async_event = 1;
760 0 : to_be16(&rsph->param3, ISCSI_LOGOUT_REQUEST_TIMEOUT);
761 :
762 0 : to_be32(&rsph->stat_sn, conn->StatSN);
763 0 : conn->StatSN++;
764 0 : to_be32(&rsph->exp_cmd_sn, conn->sess->ExpCmdSN);
765 0 : to_be32(&rsph->max_cmd_sn, conn->sess->MaxCmdSN);
766 :
767 0 : iscsi_conn_write_pdu(conn, rsp_pdu, iscsi_conn_pdu_generic_complete, NULL);
768 0 : }
769 :
770 : static int
771 0 : logout_request_timeout(void *arg)
772 : {
773 0 : struct spdk_iscsi_conn *conn = arg;
774 :
775 0 : if (conn->state < ISCSI_CONN_STATE_EXITING) {
776 0 : conn->state = ISCSI_CONN_STATE_EXITING;
777 : }
778 :
779 0 : return SPDK_POLLER_BUSY;
780 : }
781 :
782 : /* If the connection is running and logout is not requested yet, request logout
783 : * to initiator and wait for the logout process to start.
784 : */
785 : static void
786 0 : _iscsi_conn_request_logout(void *ctx)
787 : {
788 0 : struct spdk_iscsi_conn *conn = ctx;
789 :
790 0 : if (conn->state > ISCSI_CONN_STATE_RUNNING ||
791 0 : conn->logout_request_timer != NULL) {
792 0 : return;
793 : }
794 :
795 0 : iscsi_send_logout_request(conn);
796 :
797 0 : conn->logout_request_timer = SPDK_POLLER_REGISTER(logout_request_timeout,
798 : conn, ISCSI_LOGOUT_REQUEST_TIMEOUT * 1000000);
799 : }
800 :
801 : static void
802 0 : iscsi_conn_request_logout(struct spdk_iscsi_conn *conn)
803 : {
804 : struct spdk_thread *thread;
805 :
806 0 : if (conn->state == ISCSI_CONN_STATE_INVALID) {
807 : /* Move it to EXITING state if the connection is in login. */
808 0 : conn->state = ISCSI_CONN_STATE_EXITING;
809 0 : } else if (conn->state == ISCSI_CONN_STATE_RUNNING &&
810 0 : conn->logout_request_timer == NULL) {
811 0 : thread = spdk_io_channel_get_thread(spdk_io_channel_from_ctx(conn->pg));
812 0 : spdk_thread_send_msg(thread, _iscsi_conn_request_logout, conn);
813 : }
814 0 : }
815 :
816 : void
817 0 : iscsi_conns_request_logout(struct spdk_iscsi_tgt_node *target, int pg_tag)
818 : {
819 : struct spdk_iscsi_conn *conn;
820 :
821 0 : if (g_conns_array == MAP_FAILED) {
822 0 : return;
823 : }
824 :
825 0 : pthread_mutex_lock(&g_conns_mutex);
826 0 : TAILQ_FOREACH(conn, &g_active_conns, conn_link) {
827 0 : if ((target == NULL) ||
828 0 : (conn->target == target && (pg_tag < 0 || conn->pg_tag == pg_tag))) {
829 0 : iscsi_conn_request_logout(conn);
830 : }
831 : }
832 0 : pthread_mutex_unlock(&g_conns_mutex);
833 : }
834 :
835 : void
836 0 : shutdown_iscsi_conns(void)
837 : {
838 0 : iscsi_conns_request_logout(NULL, -1);
839 :
840 0 : g_shutdown_timer = SPDK_POLLER_REGISTER(iscsi_conn_check_shutdown, NULL, 1000);
841 0 : }
842 :
843 : /* Do not set conn->state if the connection has already started exiting.
844 : * This ensures we do not move a connection from EXITED state back to EXITING.
845 : */
846 : static void
847 0 : _iscsi_conn_drop(void *ctx)
848 : {
849 0 : struct spdk_iscsi_conn *conn = ctx;
850 :
851 0 : if (conn->state < ISCSI_CONN_STATE_EXITING) {
852 0 : conn->state = ISCSI_CONN_STATE_EXITING;
853 : }
854 0 : }
855 :
856 : int
857 0 : iscsi_drop_conns(struct spdk_iscsi_conn *conn, const char *conn_match,
858 : int drop_all)
859 : {
860 : struct spdk_iscsi_conn *xconn;
861 : const char *xconn_match;
862 : struct spdk_thread *thread;
863 : int num;
864 :
865 0 : SPDK_DEBUGLOG(iscsi, "iscsi_drop_conns\n");
866 :
867 0 : num = 0;
868 0 : pthread_mutex_lock(&g_conns_mutex);
869 0 : if (g_conns_array == MAP_FAILED) {
870 0 : goto exit;
871 : }
872 :
873 0 : TAILQ_FOREACH(xconn, &g_active_conns, conn_link) {
874 0 : if (xconn == conn) {
875 0 : continue;
876 : }
877 :
878 0 : if (!drop_all && xconn->initiator_port == NULL) {
879 0 : continue;
880 : }
881 :
882 0 : xconn_match =
883 0 : drop_all ? xconn->initiator_name : spdk_scsi_port_get_name(xconn->initiator_port);
884 :
885 0 : if (!strcasecmp(conn_match, xconn_match) &&
886 0 : conn->target == xconn->target) {
887 :
888 0 : if (num == 0) {
889 : /*
890 : * Only print this message before we report the
891 : * first dropped connection.
892 : */
893 0 : SPDK_ERRLOG("drop old connections %s by %s\n",
894 : conn->target->name, conn_match);
895 : }
896 :
897 0 : SPDK_ERRLOG("exiting conn by %s (%s)\n",
898 : xconn_match, xconn->initiator_addr);
899 0 : if (xconn->sess != NULL) {
900 0 : SPDK_DEBUGLOG(iscsi, "TSIH=%u\n", xconn->sess->tsih);
901 : } else {
902 0 : SPDK_DEBUGLOG(iscsi, "TSIH=xx\n");
903 : }
904 :
905 0 : SPDK_DEBUGLOG(iscsi, "CID=%u\n", xconn->cid);
906 :
907 0 : thread = spdk_io_channel_get_thread(spdk_io_channel_from_ctx(xconn->pg));
908 0 : spdk_thread_send_msg(thread, _iscsi_conn_drop, xconn);
909 :
910 0 : num++;
911 : }
912 : }
913 :
914 0 : exit:
915 0 : pthread_mutex_unlock(&g_conns_mutex);
916 :
917 0 : if (num != 0) {
918 0 : SPDK_ERRLOG("exiting %d conns\n", num);
919 : }
920 :
921 0 : return 0;
922 : }
923 :
924 : static int
925 7 : _iscsi_conn_abort_queued_datain_task(struct spdk_iscsi_conn *conn,
926 : struct spdk_iscsi_task *task)
927 : {
928 : struct spdk_iscsi_task *subtask;
929 : uint32_t remaining_size;
930 :
931 7 : if (conn->data_in_cnt >= g_iscsi.MaxLargeDataInPerConnection) {
932 2 : return -1;
933 : }
934 :
935 5 : assert(task->current_data_offset <= task->scsi.transfer_len);
936 : /* Stop split and abort read I/O for remaining data. */
937 5 : if (task->current_data_offset < task->scsi.transfer_len) {
938 5 : remaining_size = task->scsi.transfer_len - task->current_data_offset;
939 5 : subtask = iscsi_task_get(conn, task, iscsi_task_cpl);
940 5 : assert(subtask != NULL);
941 5 : subtask->scsi.offset = task->current_data_offset;
942 5 : subtask->scsi.length = remaining_size;
943 5 : spdk_scsi_task_set_data(&subtask->scsi, NULL, 0);
944 5 : task->current_data_offset += subtask->scsi.length;
945 :
946 5 : subtask->scsi.transfer_len = subtask->scsi.length;
947 5 : spdk_scsi_task_process_abort(&subtask->scsi);
948 5 : iscsi_task_cpl(&subtask->scsi);
949 : }
950 :
951 : /* Remove the primary task from the list because all subtasks are submitted
952 : * or aborted.
953 : */
954 5 : assert(task->current_data_offset == task->scsi.transfer_len);
955 5 : TAILQ_REMOVE(&conn->queued_datain_tasks, task, link);
956 5 : return 0;
957 : }
958 :
959 : int
960 0 : iscsi_conn_abort_queued_datain_task(struct spdk_iscsi_conn *conn,
961 : uint32_t ref_task_tag)
962 : {
963 : struct spdk_iscsi_task *task;
964 :
965 0 : TAILQ_FOREACH(task, &conn->queued_datain_tasks, link) {
966 0 : if (task->tag == ref_task_tag) {
967 0 : return _iscsi_conn_abort_queued_datain_task(conn, task);
968 : }
969 : }
970 :
971 0 : return 0;
972 : }
973 :
974 : int
975 2 : iscsi_conn_abort_queued_datain_tasks(struct spdk_iscsi_conn *conn,
976 : struct spdk_scsi_lun *lun,
977 : struct spdk_iscsi_pdu *pdu)
978 : {
979 : struct spdk_iscsi_task *task, *task_tmp;
980 : struct spdk_iscsi_pdu *pdu_tmp;
981 : int rc;
982 :
983 13 : TAILQ_FOREACH_SAFE(task, &conn->queued_datain_tasks, link, task_tmp) {
984 11 : pdu_tmp = iscsi_task_get_pdu(task);
985 11 : if ((lun == NULL || lun == task->scsi.lun) &&
986 6 : (pdu == NULL || (spdk_sn32_lt(pdu_tmp->cmd_sn, pdu->cmd_sn)))) {
987 3 : rc = _iscsi_conn_abort_queued_datain_task(conn, task);
988 3 : if (rc != 0) {
989 0 : return rc;
990 : }
991 : }
992 : }
993 :
994 2 : return 0;
995 : }
996 :
997 : int
998 0 : iscsi_conn_handle_queued_datain_tasks(struct spdk_iscsi_conn *conn)
999 : {
1000 : struct spdk_iscsi_task *task;
1001 :
1002 0 : while (!TAILQ_EMPTY(&conn->queued_datain_tasks) &&
1003 0 : conn->data_in_cnt < g_iscsi.MaxLargeDataInPerConnection) {
1004 0 : task = TAILQ_FIRST(&conn->queued_datain_tasks);
1005 0 : assert(task->current_data_offset <= task->scsi.transfer_len);
1006 0 : if (task->current_data_offset < task->scsi.transfer_len) {
1007 : struct spdk_iscsi_task *subtask;
1008 0 : uint32_t remaining_size = 0;
1009 :
1010 0 : remaining_size = task->scsi.transfer_len - task->current_data_offset;
1011 0 : subtask = iscsi_task_get(conn, task, iscsi_task_cpl);
1012 0 : assert(subtask != NULL);
1013 0 : subtask->scsi.offset = task->current_data_offset;
1014 0 : spdk_scsi_task_set_data(&subtask->scsi, NULL, 0);
1015 :
1016 0 : if (spdk_scsi_dev_get_lun(conn->dev, task->lun_id) == NULL) {
1017 : /* Stop submitting split read I/Os for remaining data. */
1018 0 : TAILQ_REMOVE(&conn->queued_datain_tasks, task, link);
1019 0 : task->current_data_offset += remaining_size;
1020 0 : assert(task->current_data_offset == task->scsi.transfer_len);
1021 0 : subtask->scsi.transfer_len = remaining_size;
1022 0 : spdk_scsi_task_process_null_lun(&subtask->scsi);
1023 0 : iscsi_task_cpl(&subtask->scsi);
1024 0 : return 0;
1025 : }
1026 :
1027 0 : subtask->scsi.length = spdk_min(SPDK_BDEV_LARGE_BUF_MAX_SIZE, remaining_size);
1028 0 : task->current_data_offset += subtask->scsi.length;
1029 0 : iscsi_queue_task(conn, subtask);
1030 : }
1031 0 : if (task->current_data_offset == task->scsi.transfer_len) {
1032 0 : TAILQ_REMOVE(&conn->queued_datain_tasks, task, link);
1033 : }
1034 : }
1035 0 : return 0;
1036 : }
1037 :
1038 : void
1039 0 : iscsi_task_mgmt_cpl(struct spdk_scsi_task *scsi_task)
1040 : {
1041 0 : struct spdk_iscsi_task *task = iscsi_task_from_scsi_task(scsi_task);
1042 :
1043 0 : iscsi_task_mgmt_response(task->conn, task);
1044 0 : iscsi_task_put(task);
1045 0 : }
1046 :
1047 : static void
1048 16 : process_completed_read_subtask_list_in_order(struct spdk_iscsi_conn *conn,
1049 : struct spdk_iscsi_task *primary)
1050 : {
1051 : struct spdk_iscsi_task *subtask, *tmp;
1052 :
1053 42 : TAILQ_FOREACH_SAFE(subtask, &primary->subtask_list, subtask_link, tmp) {
1054 26 : if (subtask->scsi.offset == primary->bytes_completed) {
1055 26 : TAILQ_REMOVE(&primary->subtask_list, subtask, subtask_link);
1056 26 : primary->bytes_completed += subtask->scsi.length;
1057 26 : if (primary->bytes_completed == primary->scsi.transfer_len) {
1058 7 : iscsi_task_put(primary);
1059 : }
1060 26 : iscsi_task_response(conn, subtask);
1061 26 : iscsi_task_put(subtask);
1062 : } else {
1063 0 : break;
1064 : }
1065 : }
1066 16 : }
1067 :
1068 : static void
1069 27 : process_read_task_completion(struct spdk_iscsi_conn *conn,
1070 : struct spdk_iscsi_task *task,
1071 : struct spdk_iscsi_task *primary)
1072 : {
1073 : struct spdk_iscsi_task *tmp;
1074 :
1075 27 : if (task->scsi.status != SPDK_SCSI_STATUS_GOOD) {
1076 1 : if (primary->scsi.status == SPDK_SCSI_STATUS_GOOD) {
1077 : /* If the status of the completed subtask, task, is the
1078 : * first failure, copy it to out-of-order subtasks, and
1079 : * remember it as the status of the SCSI Read Command.
1080 : */
1081 3 : TAILQ_FOREACH(tmp, &primary->subtask_list, subtask_link) {
1082 2 : spdk_scsi_task_copy_status(&tmp->scsi, &task->scsi);
1083 : }
1084 1 : spdk_scsi_task_copy_status(&primary->scsi, &task->scsi);
1085 : }
1086 26 : } else if (primary->scsi.status != SPDK_SCSI_STATUS_GOOD) {
1087 : /* Even if the status of the completed subtask is success,
1088 : * if there are any failed subtask ever, copy the first failed
1089 : * status to it.
1090 : */
1091 3 : spdk_scsi_task_copy_status(&task->scsi, &primary->scsi);
1092 : }
1093 :
1094 27 : if (task == primary) {
1095 : /* If read I/O size is not larger than SPDK_BDEV_LARGE_BUF_MAX_SIZE,
1096 : * the primary task which processes the SCSI Read Command PDU is
1097 : * submitted directly. Hence send SCSI Response PDU for the primary
1098 : * task simply.
1099 : */
1100 0 : primary->bytes_completed = task->scsi.length;
1101 0 : assert(primary->bytes_completed == task->scsi.transfer_len);
1102 0 : iscsi_task_response(conn, task);
1103 0 : iscsi_task_put(task);
1104 27 : } else if (!conn->sess->DataSequenceInOrder) {
1105 : /* If DataSequenceInOrder is No, send SCSI Response PDU for the completed
1106 : * subtask without any deferral.
1107 : */
1108 0 : primary->bytes_completed += task->scsi.length;
1109 0 : if (primary->bytes_completed == primary->scsi.transfer_len) {
1110 0 : iscsi_task_put(primary);
1111 : }
1112 0 : iscsi_task_response(conn, task);
1113 0 : iscsi_task_put(task);
1114 : } else {
1115 : /* If DataSequenceInOrder is Yes, if the completed subtask is out-of-order,
1116 : * it is deferred until all preceding subtasks send SCSI Response PDU.
1117 : */
1118 27 : if (task->scsi.offset != primary->bytes_completed) {
1119 11 : TAILQ_FOREACH(tmp, &primary->subtask_list, subtask_link) {
1120 8 : if (task->scsi.offset < tmp->scsi.offset) {
1121 8 : TAILQ_INSERT_BEFORE(tmp, task, subtask_link);
1122 8 : return;
1123 : }
1124 : }
1125 :
1126 3 : TAILQ_INSERT_TAIL(&primary->subtask_list, task, subtask_link);
1127 : } else {
1128 16 : TAILQ_INSERT_HEAD(&primary->subtask_list, task, subtask_link);
1129 16 : process_completed_read_subtask_list_in_order(conn, primary);
1130 : }
1131 : }
1132 : }
1133 :
1134 : static void
1135 4 : process_non_read_task_completion(struct spdk_iscsi_conn *conn,
1136 : struct spdk_iscsi_task *task,
1137 : struct spdk_iscsi_task *primary)
1138 : {
1139 4 : primary->bytes_completed += task->scsi.length;
1140 :
1141 4 : if (task == primary) {
1142 : /* This was a small write with no R2T. */
1143 0 : iscsi_task_response(conn, task);
1144 0 : iscsi_task_put(task);
1145 0 : return;
1146 : }
1147 :
1148 4 : if (task->scsi.status == SPDK_SCSI_STATUS_GOOD) {
1149 3 : primary->scsi.data_transferred += task->scsi.data_transferred;
1150 1 : } else if (primary->scsi.status == SPDK_SCSI_STATUS_GOOD) {
1151 : /* If the status of this subtask is the first failure, copy it to
1152 : * the primary task.
1153 : */
1154 1 : spdk_scsi_task_copy_status(&primary->scsi, &task->scsi);
1155 : }
1156 :
1157 4 : if (primary->bytes_completed == primary->scsi.transfer_len) {
1158 : /* If LUN is removed in the middle of the iSCSI write sequence,
1159 : * primary might complete the write to the initiator because it is not
1160 : * ensured that the initiator will send all data requested by R2Ts.
1161 : *
1162 : * We check it and skip the following if primary is completed. (see
1163 : * iscsi_clear_all_transfer_task() in iscsi.c.)
1164 : */
1165 2 : if (primary->is_r2t_active) {
1166 1 : iscsi_task_response(conn, primary);
1167 1 : iscsi_del_transfer_task(conn, primary->tag);
1168 : } else {
1169 1 : iscsi_task_response(conn, task);
1170 : }
1171 : }
1172 4 : iscsi_task_put(task);
1173 : }
1174 :
1175 : void
1176 5 : iscsi_task_cpl(struct spdk_scsi_task *scsi_task)
1177 : {
1178 : struct spdk_iscsi_task *primary;
1179 5 : struct spdk_iscsi_task *task = iscsi_task_from_scsi_task(scsi_task);
1180 5 : struct spdk_iscsi_conn *conn = task->conn;
1181 5 : struct spdk_iscsi_pdu *pdu = task->pdu;
1182 :
1183 5 : spdk_trace_record(TRACE_ISCSI_TASK_DONE, conn->id, 0, (uintptr_t)task);
1184 :
1185 5 : task->is_queued = false;
1186 5 : primary = iscsi_task_get_primary(task);
1187 :
1188 5 : if (iscsi_task_is_read(primary)) {
1189 5 : process_read_task_completion(conn, task, primary);
1190 : } else {
1191 0 : process_non_read_task_completion(conn, task, primary);
1192 : }
1193 5 : if (!task->parent) {
1194 0 : spdk_trace_record(TRACE_ISCSI_PDU_COMPLETED, 0, 0, (uintptr_t)pdu);
1195 : }
1196 5 : }
1197 :
1198 : static void
1199 0 : iscsi_conn_send_nopin(struct spdk_iscsi_conn *conn)
1200 : {
1201 : struct spdk_iscsi_pdu *rsp_pdu;
1202 : struct iscsi_bhs_nop_in *rsp;
1203 : /* Only send nopin if we have logged in and are in a normal session. */
1204 0 : if (conn->sess == NULL ||
1205 0 : !conn->full_feature ||
1206 0 : !iscsi_param_eq_val(conn->sess->params, "SessionType", "Normal")) {
1207 0 : return;
1208 : }
1209 0 : SPDK_DEBUGLOG(iscsi, "send NOPIN isid=%"PRIx64", tsih=%u, cid=%u\n",
1210 : conn->sess->isid, conn->sess->tsih, conn->cid);
1211 0 : SPDK_DEBUGLOG(iscsi, "StatSN=%u, ExpCmdSN=%u, MaxCmdSN=%u\n",
1212 : conn->StatSN, conn->sess->ExpCmdSN,
1213 : conn->sess->MaxCmdSN);
1214 0 : rsp_pdu = iscsi_get_pdu(conn);
1215 0 : rsp = (struct iscsi_bhs_nop_in *) &rsp_pdu->bhs;
1216 0 : rsp_pdu->data = NULL;
1217 : /*
1218 : * iscsi_get_pdu() memset's the PDU for us, so only fill out the needed
1219 : * fields.
1220 : */
1221 0 : rsp->opcode = ISCSI_OP_NOPIN;
1222 0 : rsp->flags = 0x80;
1223 : /*
1224 : * Technically the to_be32() is not needed here, since
1225 : * to_be32(0xFFFFFFFU) returns 0xFFFFFFFFU.
1226 : */
1227 0 : to_be32(&rsp->itt, 0xFFFFFFFFU);
1228 0 : to_be32(&rsp->ttt, conn->id);
1229 0 : to_be32(&rsp->stat_sn, conn->StatSN);
1230 0 : to_be32(&rsp->exp_cmd_sn, conn->sess->ExpCmdSN);
1231 0 : to_be32(&rsp->max_cmd_sn, conn->sess->MaxCmdSN);
1232 0 : iscsi_conn_write_pdu(conn, rsp_pdu, iscsi_conn_pdu_generic_complete, NULL);
1233 0 : conn->last_nopin = spdk_get_ticks();
1234 0 : conn->nop_outstanding = true;
1235 : }
1236 :
1237 : void
1238 0 : iscsi_conn_handle_nop(struct spdk_iscsi_conn *conn)
1239 : {
1240 : uint64_t tsc;
1241 :
1242 : /**
1243 : * This function will be executed by nop_poller of iSCSI polling group, so
1244 : * we need to check the connection state first, then do the nop interval
1245 : * expiration check work.
1246 : */
1247 0 : if ((conn->state == ISCSI_CONN_STATE_EXITED) ||
1248 0 : (conn->state == ISCSI_CONN_STATE_EXITING)) {
1249 0 : return;
1250 : }
1251 :
1252 : /* Check for nop interval expiration */
1253 0 : tsc = spdk_get_ticks();
1254 0 : if (conn->nop_outstanding) {
1255 0 : if ((tsc - conn->last_nopin) > conn->timeout) {
1256 0 : SPDK_ERRLOG("Timed out waiting for NOP-Out response from initiator\n");
1257 0 : SPDK_ERRLOG(" tsc=0x%" PRIx64 ", last_nopin=0x%" PRIx64 "\n", tsc, conn->last_nopin);
1258 0 : SPDK_ERRLOG(" initiator=%s, target=%s\n", conn->initiator_name,
1259 : conn->target_short_name);
1260 0 : conn->state = ISCSI_CONN_STATE_EXITING;
1261 : }
1262 0 : } else if (tsc - conn->last_nopin > conn->nopininterval) {
1263 0 : iscsi_conn_send_nopin(conn);
1264 : }
1265 : }
1266 :
1267 : /**
1268 : * \brief Reads data for the specified iSCSI connection from its TCP socket.
1269 : *
1270 : * The TCP socket is marked as non-blocking, so this function may not read
1271 : * all data requested.
1272 : *
1273 : * Returns SPDK_ISCSI_CONNECTION_FATAL if the recv() operation indicates a fatal
1274 : * error with the TCP connection (including if the TCP connection was closed
1275 : * unexpectedly.
1276 : *
1277 : * Otherwise returns the number of bytes successfully read.
1278 : */
1279 : int
1280 0 : iscsi_conn_read_data(struct spdk_iscsi_conn *conn, int bytes,
1281 : void *buf)
1282 : {
1283 : int ret;
1284 :
1285 0 : if (bytes == 0) {
1286 0 : return 0;
1287 : }
1288 :
1289 0 : ret = spdk_sock_recv(conn->sock, buf, bytes);
1290 :
1291 0 : if (ret > 0) {
1292 0 : spdk_trace_record(TRACE_ISCSI_READ_FROM_SOCKET_DONE, conn->id, ret, 0);
1293 0 : return ret;
1294 : }
1295 :
1296 0 : if (ret < 0) {
1297 0 : if (errno == EAGAIN || errno == EWOULDBLOCK) {
1298 0 : return 0;
1299 : }
1300 :
1301 : /* For connect reset issue, do not output error log */
1302 0 : if (errno == ECONNRESET) {
1303 0 : SPDK_DEBUGLOG(iscsi, "spdk_sock_recv() failed, errno %d: %s\n",
1304 : errno, spdk_strerror(errno));
1305 : } else {
1306 0 : SPDK_ERRLOG("spdk_sock_recv() failed, errno %d: %s\n",
1307 : errno, spdk_strerror(errno));
1308 : }
1309 : }
1310 :
1311 : /* connection closed */
1312 0 : return SPDK_ISCSI_CONNECTION_FATAL;
1313 : }
1314 :
1315 : int
1316 0 : iscsi_conn_readv_data(struct spdk_iscsi_conn *conn,
1317 : struct iovec *iov, int iovcnt)
1318 : {
1319 : int ret;
1320 :
1321 0 : if (iov == NULL || iovcnt == 0) {
1322 0 : return 0;
1323 : }
1324 :
1325 0 : if (iovcnt == 1) {
1326 0 : return iscsi_conn_read_data(conn, iov[0].iov_len,
1327 : iov[0].iov_base);
1328 : }
1329 :
1330 0 : ret = spdk_sock_readv(conn->sock, iov, iovcnt);
1331 :
1332 0 : if (ret > 0) {
1333 0 : spdk_trace_record(TRACE_ISCSI_READ_FROM_SOCKET_DONE, conn->id, ret, 0);
1334 0 : return ret;
1335 : }
1336 :
1337 0 : if (ret < 0) {
1338 0 : if (errno == EAGAIN || errno == EWOULDBLOCK) {
1339 0 : return 0;
1340 : }
1341 :
1342 : /* For connect reset issue, do not output error log */
1343 0 : if (errno == ECONNRESET) {
1344 0 : SPDK_DEBUGLOG(iscsi, "spdk_sock_readv() failed, errno %d: %s\n",
1345 : errno, spdk_strerror(errno));
1346 : } else {
1347 0 : SPDK_ERRLOG("spdk_sock_readv() failed, errno %d: %s\n",
1348 : errno, spdk_strerror(errno));
1349 : }
1350 : }
1351 :
1352 : /* connection closed */
1353 0 : return SPDK_ISCSI_CONNECTION_FATAL;
1354 : }
1355 :
1356 : static bool
1357 0 : iscsi_is_free_pdu_deferred(struct spdk_iscsi_pdu *pdu)
1358 : {
1359 0 : if (pdu == NULL) {
1360 0 : return false;
1361 : }
1362 :
1363 0 : if (pdu->bhs.opcode == ISCSI_OP_R2T ||
1364 0 : pdu->bhs.opcode == ISCSI_OP_SCSI_DATAIN) {
1365 0 : return true;
1366 : }
1367 :
1368 0 : return false;
1369 : }
1370 :
1371 : static int
1372 0 : iscsi_dif_verify(struct spdk_iscsi_pdu *pdu, struct spdk_dif_ctx *dif_ctx)
1373 : {
1374 0 : struct iovec iov;
1375 0 : struct spdk_dif_error err_blk = {};
1376 : uint32_t num_blocks;
1377 : int rc;
1378 :
1379 0 : iov.iov_base = pdu->data;
1380 0 : iov.iov_len = pdu->data_buf_len;
1381 0 : num_blocks = pdu->data_buf_len / dif_ctx->block_size;
1382 :
1383 0 : rc = spdk_dif_verify(&iov, 1, num_blocks, dif_ctx, &err_blk);
1384 0 : if (rc != 0) {
1385 0 : SPDK_ERRLOG("DIF error detected. type=%d, offset=%" PRIu32 "\n",
1386 : err_blk.err_type, err_blk.err_offset);
1387 : }
1388 :
1389 0 : return rc;
1390 : }
1391 :
1392 : static void
1393 0 : _iscsi_conn_pdu_write_done(void *cb_arg, int err)
1394 : {
1395 0 : struct spdk_iscsi_pdu *pdu = cb_arg;
1396 0 : struct spdk_iscsi_conn *conn = pdu->conn;
1397 :
1398 0 : assert(conn != NULL);
1399 :
1400 0 : if (spdk_unlikely(conn->state >= ISCSI_CONN_STATE_EXITING)) {
1401 : /* The other policy will recycle the resource */
1402 0 : return;
1403 : }
1404 :
1405 0 : TAILQ_REMOVE(&conn->write_pdu_list, pdu, tailq);
1406 :
1407 0 : if (err != 0) {
1408 0 : conn->state = ISCSI_CONN_STATE_EXITING;
1409 : } else {
1410 0 : spdk_trace_record(TRACE_ISCSI_FLUSH_WRITEBUF_DONE, conn->id, pdu->mapped_length, (uintptr_t)pdu);
1411 : }
1412 :
1413 0 : if ((conn->full_feature) &&
1414 0 : (conn->sess->ErrorRecoveryLevel >= 1) &&
1415 0 : iscsi_is_free_pdu_deferred(pdu)) {
1416 0 : SPDK_DEBUGLOG(iscsi, "stat_sn=%d\n",
1417 : from_be32(&pdu->bhs.stat_sn));
1418 0 : TAILQ_INSERT_TAIL(&conn->snack_pdu_list, pdu,
1419 : tailq);
1420 : } else {
1421 0 : iscsi_conn_free_pdu(conn, pdu);
1422 : }
1423 : }
1424 :
1425 : void
1426 0 : iscsi_conn_pdu_generic_complete(void *cb_arg)
1427 : {
1428 0 : }
1429 :
1430 : void
1431 0 : iscsi_conn_write_pdu(struct spdk_iscsi_conn *conn, struct spdk_iscsi_pdu *pdu,
1432 : iscsi_conn_xfer_complete_cb cb_fn,
1433 : void *cb_arg)
1434 : {
1435 : uint32_t crc32c;
1436 : ssize_t rc;
1437 :
1438 0 : if (spdk_unlikely(pdu->dif_insert_or_strip)) {
1439 0 : rc = iscsi_dif_verify(pdu, &pdu->dif_ctx);
1440 0 : if (rc != 0) {
1441 0 : iscsi_conn_free_pdu(conn, pdu);
1442 0 : conn->state = ISCSI_CONN_STATE_EXITING;
1443 0 : return;
1444 : }
1445 : }
1446 :
1447 0 : if (pdu->bhs.opcode != ISCSI_OP_LOGIN_RSP) {
1448 : /* Header Digest */
1449 0 : if (conn->header_digest) {
1450 0 : crc32c = iscsi_pdu_calc_header_digest(pdu);
1451 0 : MAKE_DIGEST_WORD(pdu->header_digest, crc32c);
1452 : }
1453 :
1454 : /* Data Digest */
1455 0 : if (conn->data_digest && DGET24(pdu->bhs.data_segment_len) != 0) {
1456 0 : crc32c = iscsi_pdu_calc_data_digest(pdu);
1457 0 : MAKE_DIGEST_WORD(pdu->data_digest, crc32c);
1458 : }
1459 : }
1460 :
1461 0 : pdu->cb_fn = cb_fn;
1462 0 : pdu->cb_arg = cb_arg;
1463 0 : TAILQ_INSERT_TAIL(&conn->write_pdu_list, pdu, tailq);
1464 :
1465 0 : if (spdk_unlikely(conn->state >= ISCSI_CONN_STATE_EXITING)) {
1466 0 : return;
1467 : }
1468 0 : pdu->sock_req.iovcnt = iscsi_build_iovs(conn, pdu->iov, SPDK_COUNTOF(pdu->iov), pdu,
1469 0 : &pdu->mapped_length);
1470 0 : pdu->sock_req.cb_fn = _iscsi_conn_pdu_write_done;
1471 0 : pdu->sock_req.cb_arg = pdu;
1472 :
1473 0 : spdk_trace_record(TRACE_ISCSI_FLUSH_WRITEBUF_START, conn->id, pdu->mapped_length, (uintptr_t)pdu,
1474 : pdu->sock_req.iovcnt);
1475 0 : spdk_sock_writev_async(conn->sock, &pdu->sock_req);
1476 : }
1477 :
1478 : static void
1479 0 : iscsi_conn_sock_cb(void *arg, struct spdk_sock_group *group, struct spdk_sock *sock)
1480 : {
1481 0 : struct spdk_iscsi_conn *conn = arg;
1482 : int rc;
1483 :
1484 0 : assert(conn != NULL);
1485 :
1486 0 : if ((conn->state == ISCSI_CONN_STATE_EXITED) ||
1487 0 : (conn->state == ISCSI_CONN_STATE_EXITING)) {
1488 0 : return;
1489 : }
1490 :
1491 : /* Handle incoming PDUs */
1492 0 : rc = iscsi_handle_incoming_pdus(conn);
1493 0 : if (rc < 0) {
1494 0 : conn->state = ISCSI_CONN_STATE_EXITING;
1495 : }
1496 : }
1497 :
1498 : static void
1499 0 : iscsi_conn_full_feature_migrate(void *arg)
1500 : {
1501 0 : struct spdk_iscsi_conn *conn = arg;
1502 : int rc;
1503 :
1504 0 : assert(conn->state != ISCSI_CONN_STATE_EXITED);
1505 :
1506 : /* Note: it is possible that connection could have moved to EXITING
1507 : * state after this message was sent. We will still add it to the
1508 : * poll group in this case. When the poll group is polled
1509 : * again, it will call iscsi_conn_destruct() on it.
1510 : */
1511 :
1512 0 : if (conn->sess->session_type == SESSION_TYPE_NORMAL) {
1513 0 : rc = iscsi_conn_open_luns(conn);
1514 0 : if (rc != 0) {
1515 : /* If opening LUNs failed, it is a fatal error. At the first poll in the
1516 : * assigned poll group, this connection will be destructed.
1517 : */
1518 0 : conn->state = ISCSI_CONN_STATE_EXITING;
1519 : }
1520 : }
1521 :
1522 : /* Add this connection to the assigned poll group. */
1523 0 : iscsi_poll_group_add_conn(conn->pg, conn);
1524 0 : }
1525 :
1526 : static struct spdk_iscsi_poll_group *g_next_pg = NULL;
1527 :
1528 : void
1529 0 : iscsi_conn_schedule(struct spdk_iscsi_conn *conn)
1530 : {
1531 : struct spdk_iscsi_poll_group *pg;
1532 : struct spdk_iscsi_tgt_node *target;
1533 :
1534 0 : if (conn->sess->session_type != SESSION_TYPE_NORMAL) {
1535 : /* Leave all non-normal sessions on the acceptor
1536 : * thread. */
1537 0 : return;
1538 : }
1539 0 : pthread_mutex_lock(&g_iscsi.mutex);
1540 :
1541 0 : target = conn->sess->target;
1542 0 : pthread_mutex_lock(&target->mutex);
1543 0 : target->num_active_conns++;
1544 0 : if (target->num_active_conns == 1) {
1545 : /**
1546 : * This is the only active connection for this target node.
1547 : * Pick a poll group using round-robin.
1548 : */
1549 0 : if (g_next_pg == NULL) {
1550 0 : g_next_pg = TAILQ_FIRST(&g_iscsi.poll_group_head);
1551 0 : assert(g_next_pg != NULL);
1552 : }
1553 :
1554 0 : pg = g_next_pg;
1555 0 : g_next_pg = TAILQ_NEXT(g_next_pg, link);
1556 :
1557 : /* Save the pg in the target node so it can be used for any other connections to this target node. */
1558 0 : target->pg = pg;
1559 : } else {
1560 : /**
1561 : * There are other active connections for this target node.
1562 : */
1563 0 : pg = target->pg;
1564 : }
1565 :
1566 0 : pthread_mutex_unlock(&target->mutex);
1567 0 : pthread_mutex_unlock(&g_iscsi.mutex);
1568 :
1569 0 : assert(spdk_io_channel_get_thread(spdk_io_channel_from_ctx(conn->pg)) ==
1570 : spdk_get_thread());
1571 :
1572 : /* Remove this connection from the previous poll group */
1573 0 : iscsi_poll_group_remove_conn(conn->pg, conn);
1574 :
1575 0 : conn->pg = pg;
1576 :
1577 0 : spdk_thread_send_msg(spdk_io_channel_get_thread(spdk_io_channel_from_ctx(pg)),
1578 : iscsi_conn_full_feature_migrate, conn);
1579 : }
1580 :
1581 : static int
1582 0 : logout_timeout(void *arg)
1583 : {
1584 0 : struct spdk_iscsi_conn *conn = arg;
1585 :
1586 0 : if (conn->state < ISCSI_CONN_STATE_EXITING) {
1587 0 : conn->state = ISCSI_CONN_STATE_EXITING;
1588 : }
1589 :
1590 0 : return SPDK_POLLER_BUSY;
1591 : }
1592 :
1593 : void
1594 0 : iscsi_conn_logout(struct spdk_iscsi_conn *conn)
1595 : {
1596 0 : conn->is_logged_out = true;
1597 0 : conn->logout_timer = SPDK_POLLER_REGISTER(logout_timeout, conn, ISCSI_LOGOUT_TIMEOUT * 1000000);
1598 0 : }
1599 :
1600 : static const char *
1601 0 : iscsi_conn_get_state(struct spdk_iscsi_conn *conn)
1602 : {
1603 0 : switch (conn->state) {
1604 0 : SPDK_ISCSI_CONNECTION_STATUS(ISCSI_CONN_STATE_INVALID, "invalid");
1605 0 : SPDK_ISCSI_CONNECTION_STATUS(ISCSI_CONN_STATE_RUNNING, "running");
1606 0 : SPDK_ISCSI_CONNECTION_STATUS(ISCSI_CONN_STATE_EXITING, "exiting");
1607 0 : SPDK_ISCSI_CONNECTION_STATUS(ISCSI_CONN_STATE_EXITED, "exited");
1608 : }
1609 0 : return "unknown";
1610 : }
1611 :
1612 : static const char *
1613 0 : iscsi_conn_get_login_phase(struct spdk_iscsi_conn *conn)
1614 : {
1615 0 : switch (conn->login_phase) {
1616 0 : SPDK_ISCSI_CONNECTION_STATUS(ISCSI_SECURITY_NEGOTIATION_PHASE, "security_negotiation_phase");
1617 0 : SPDK_ISCSI_CONNECTION_STATUS(ISCSI_OPERATIONAL_NEGOTIATION_PHASE, "operational_negotiation_phase");
1618 0 : SPDK_ISCSI_CONNECTION_STATUS(ISCSI_FULL_FEATURE_PHASE, "full_feature_phase");
1619 : }
1620 0 : return "not_started";
1621 : }
1622 :
1623 1 : SPDK_TRACE_REGISTER_FN(iscsi_conn_trace, "iscsi_conn", TRACE_GROUP_ISCSI)
1624 : {
1625 0 : spdk_trace_register_owner(OWNER_ISCSI_CONN, 'c');
1626 0 : spdk_trace_register_object(OBJECT_ISCSI_PDU, 'p');
1627 0 : spdk_trace_register_description("ISCSI_READ_DONE", TRACE_ISCSI_READ_FROM_SOCKET_DONE,
1628 : OWNER_ISCSI_CONN, OBJECT_NONE, 0,
1629 : SPDK_TRACE_ARG_TYPE_INT, "");
1630 0 : spdk_trace_register_description("ISCSI_WRITE_START", TRACE_ISCSI_FLUSH_WRITEBUF_START,
1631 : OWNER_ISCSI_CONN, OBJECT_ISCSI_PDU, 1,
1632 : SPDK_TRACE_ARG_TYPE_INT, "iovec");
1633 0 : spdk_trace_register_description("ISCSI_WRITE_DONE", TRACE_ISCSI_FLUSH_WRITEBUF_DONE,
1634 : OWNER_ISCSI_CONN, OBJECT_ISCSI_PDU, 0,
1635 : SPDK_TRACE_ARG_TYPE_INT, "");
1636 0 : spdk_trace_register_description("ISCSI_READ_PDU", TRACE_ISCSI_READ_PDU,
1637 : OWNER_ISCSI_CONN, OBJECT_ISCSI_PDU, 1,
1638 : SPDK_TRACE_ARG_TYPE_INT, "opc");
1639 0 : spdk_trace_register_description("ISCSI_TASK_DONE", TRACE_ISCSI_TASK_DONE,
1640 : OWNER_ISCSI_CONN, OBJECT_SCSI_TASK, 0,
1641 : SPDK_TRACE_ARG_TYPE_INT, "");
1642 0 : spdk_trace_register_description("ISCSI_TASK_QUEUE", TRACE_ISCSI_TASK_QUEUE,
1643 : OWNER_ISCSI_CONN, OBJECT_SCSI_TASK, 1,
1644 : SPDK_TRACE_ARG_TYPE_PTR, "pdu");
1645 0 : spdk_trace_register_description("ISCSI_TASK_EXECUTED", TRACE_ISCSI_TASK_EXECUTED,
1646 : OWNER_ISCSI_CONN, OBJECT_ISCSI_PDU, 0,
1647 : SPDK_TRACE_ARG_TYPE_INT, "");
1648 0 : spdk_trace_register_description("ISCSI_PDU_COMPLETED", TRACE_ISCSI_PDU_COMPLETED,
1649 : OWNER_ISCSI_CONN, OBJECT_ISCSI_PDU, 0,
1650 : SPDK_TRACE_ARG_TYPE_INT, "");
1651 0 : }
1652 :
1653 : void
1654 0 : iscsi_conn_info_json(struct spdk_json_write_ctx *w, struct spdk_iscsi_conn *conn)
1655 : {
1656 : uint16_t tsih;
1657 :
1658 0 : if (!conn->is_valid) {
1659 0 : return;
1660 : }
1661 :
1662 0 : spdk_json_write_object_begin(w);
1663 :
1664 0 : spdk_json_write_named_int32(w, "id", conn->id);
1665 :
1666 0 : spdk_json_write_named_int32(w, "cid", conn->cid);
1667 :
1668 : /*
1669 : * If we try to return data for a connection that has not
1670 : * logged in yet, the session will not be set. So in this
1671 : * case, return -1 for the tsih rather than segfaulting
1672 : * on the null conn->sess.
1673 : */
1674 0 : if (conn->sess == NULL) {
1675 0 : tsih = -1;
1676 : } else {
1677 0 : tsih = conn->sess->tsih;
1678 : }
1679 0 : spdk_json_write_named_int32(w, "tsih", tsih);
1680 :
1681 0 : spdk_json_write_named_string(w, "state", iscsi_conn_get_state(conn));
1682 :
1683 0 : spdk_json_write_named_string(w, "login_phase", iscsi_conn_get_login_phase(conn));
1684 :
1685 0 : spdk_json_write_named_string(w, "initiator_addr", conn->initiator_addr);
1686 :
1687 0 : spdk_json_write_named_string(w, "target_addr", conn->target_addr);
1688 :
1689 0 : spdk_json_write_named_string(w, "target_node_name", conn->target_short_name);
1690 :
1691 0 : spdk_json_write_named_string(w, "thread_name",
1692 0 : spdk_thread_get_name(spdk_get_thread()));
1693 :
1694 0 : spdk_json_write_object_end(w);
1695 : }
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