1// SPDX-License-Identifier: GPL-2.0-or-later 2/******************************************************************************* 3 * This file contains the iSCSI Target specific utility functions. 4 * 5 * (c) Copyright 2007-2013 Datera, Inc. 6 * 7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 8 * 9 ******************************************************************************/ 10 11#include <linux/list.h> 12#include <linux/sched/signal.h> 13#include <net/ipv6.h> /* ipv6_addr_equal() */ 14#include <scsi/scsi_tcq.h> 15#include <scsi/iscsi_proto.h> 16#include <target/target_core_base.h> 17#include <target/target_core_fabric.h> 18#include <target/iscsi/iscsi_transport.h> 19 20#include <target/iscsi/iscsi_target_core.h> 21#include "iscsi_target_parameters.h" 22#include "iscsi_target_seq_pdu_list.h" 23#include "iscsi_target_datain_values.h" 24#include "iscsi_target_erl0.h" 25#include "iscsi_target_erl1.h" 26#include "iscsi_target_erl2.h" 27#include "iscsi_target_tpg.h" 28#include "iscsi_target_util.h" 29#include "iscsi_target.h" 30 31extern struct list_head g_tiqn_list; 32extern spinlock_t tiqn_lock; 33 34int iscsit_add_r2t_to_list( 35 struct iscsit_cmd *cmd, 36 u32 offset, 37 u32 xfer_len, 38 int recovery, 39 u32 r2t_sn) 40{ 41 struct iscsi_r2t *r2t; 42 43 lockdep_assert_held(&cmd->r2t_lock); 44 45 WARN_ON_ONCE((s32)xfer_len < 0); 46 47 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC); 48 if (!r2t) { 49 pr_err("Unable to allocate memory for struct iscsi_r2t.\n"); 50 return -1; 51 } 52 INIT_LIST_HEAD(&r2t->r2t_list); 53 54 r2t->recovery_r2t = recovery; 55 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn; 56 r2t->offset = offset; 57 r2t->xfer_len = xfer_len; 58 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list); 59 spin_unlock_bh(&cmd->r2t_lock); 60 61 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); 62 63 spin_lock_bh(&cmd->r2t_lock); 64 return 0; 65} 66 67struct iscsi_r2t *iscsit_get_r2t_for_eos( 68 struct iscsit_cmd *cmd, 69 u32 offset, 70 u32 length) 71{ 72 struct iscsi_r2t *r2t; 73 74 spin_lock_bh(&cmd->r2t_lock); 75 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 76 if ((r2t->offset <= offset) && 77 (r2t->offset + r2t->xfer_len) >= (offset + length)) { 78 spin_unlock_bh(&cmd->r2t_lock); 79 return r2t; 80 } 81 } 82 spin_unlock_bh(&cmd->r2t_lock); 83 84 pr_err("Unable to locate R2T for Offset: %u, Length:" 85 " %u\n", offset, length); 86 return NULL; 87} 88 89struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsit_cmd *cmd) 90{ 91 struct iscsi_r2t *r2t; 92 93 spin_lock_bh(&cmd->r2t_lock); 94 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 95 if (!r2t->sent_r2t) { 96 spin_unlock_bh(&cmd->r2t_lock); 97 return r2t; 98 } 99 } 100 spin_unlock_bh(&cmd->r2t_lock); 101 102 pr_err("Unable to locate next R2T to send for ITT:" 103 " 0x%08x.\n", cmd->init_task_tag); 104 return NULL; 105} 106 107void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsit_cmd *cmd) 108{ 109 lockdep_assert_held(&cmd->r2t_lock); 110 111 list_del(&r2t->r2t_list); 112 kmem_cache_free(lio_r2t_cache, r2t); 113} 114 115void iscsit_free_r2ts_from_list(struct iscsit_cmd *cmd) 116{ 117 struct iscsi_r2t *r2t, *r2t_tmp; 118 119 spin_lock_bh(&cmd->r2t_lock); 120 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) 121 iscsit_free_r2t(r2t, cmd); 122 spin_unlock_bh(&cmd->r2t_lock); 123} 124 125static int iscsit_wait_for_tag(struct se_session *se_sess, int state, int *cpup) 126{ 127 int tag = -1; 128 DEFINE_SBQ_WAIT(wait); 129 struct sbq_wait_state *ws; 130 struct sbitmap_queue *sbq; 131 132 if (state == TASK_RUNNING) 133 return tag; 134 135 sbq = &se_sess->sess_tag_pool; 136 ws = &sbq->ws[0]; 137 for (;;) { 138 sbitmap_prepare_to_wait(sbq, ws, &wait, state); 139 if (signal_pending_state(state, current)) 140 break; 141 tag = sbitmap_queue_get(sbq, cpup); 142 if (tag >= 0) 143 break; 144 schedule(); 145 } 146 147 sbitmap_finish_wait(sbq, ws, &wait); 148 return tag; 149} 150 151/* 152 * May be called from software interrupt (timer) context for allocating 153 * iSCSI NopINs. 154 */ 155struct iscsit_cmd *iscsit_allocate_cmd(struct iscsit_conn *conn, int state) 156{ 157 struct iscsit_cmd *cmd; 158 struct se_session *se_sess = conn->sess->se_sess; 159 int size, tag, cpu; 160 161 tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); 162 if (tag < 0) 163 tag = iscsit_wait_for_tag(se_sess, state, &cpu); 164 if (tag < 0) 165 return NULL; 166 167 size = sizeof(struct iscsit_cmd) + conn->conn_transport->priv_size; 168 cmd = (struct iscsit_cmd *)(se_sess->sess_cmd_map + (tag * size)); 169 memset(cmd, 0, size); 170 171 cmd->se_cmd.map_tag = tag; 172 cmd->se_cmd.map_cpu = cpu; 173 cmd->conn = conn; 174 cmd->data_direction = DMA_NONE; 175 INIT_LIST_HEAD(&cmd->i_conn_node); 176 INIT_LIST_HEAD(&cmd->datain_list); 177 INIT_LIST_HEAD(&cmd->cmd_r2t_list); 178 spin_lock_init(&cmd->datain_lock); 179 spin_lock_init(&cmd->dataout_timeout_lock); 180 spin_lock_init(&cmd->istate_lock); 181 spin_lock_init(&cmd->error_lock); 182 spin_lock_init(&cmd->r2t_lock); 183 timer_setup(&cmd->dataout_timer, iscsit_handle_dataout_timeout, 0); 184 185 return cmd; 186} 187EXPORT_SYMBOL(iscsit_allocate_cmd); 188 189struct iscsi_seq *iscsit_get_seq_holder_for_datain( 190 struct iscsit_cmd *cmd, 191 u32 seq_send_order) 192{ 193 u32 i; 194 195 for (i = 0; i < cmd->seq_count; i++) 196 if (cmd->seq_list[i].seq_send_order == seq_send_order) 197 return &cmd->seq_list[i]; 198 199 return NULL; 200} 201 202struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsit_cmd *cmd) 203{ 204 u32 i; 205 206 if (!cmd->seq_list) { 207 pr_err("struct iscsit_cmd->seq_list is NULL!\n"); 208 return NULL; 209 } 210 211 for (i = 0; i < cmd->seq_count; i++) { 212 if (cmd->seq_list[i].type != SEQTYPE_NORMAL) 213 continue; 214 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) { 215 cmd->seq_send_order++; 216 return &cmd->seq_list[i]; 217 } 218 } 219 220 return NULL; 221} 222 223struct iscsi_r2t *iscsit_get_holder_for_r2tsn( 224 struct iscsit_cmd *cmd, 225 u32 r2t_sn) 226{ 227 struct iscsi_r2t *r2t; 228 229 spin_lock_bh(&cmd->r2t_lock); 230 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 231 if (r2t->r2t_sn == r2t_sn) { 232 spin_unlock_bh(&cmd->r2t_lock); 233 return r2t; 234 } 235 } 236 spin_unlock_bh(&cmd->r2t_lock); 237 238 return NULL; 239} 240 241static inline int iscsit_check_received_cmdsn(struct iscsit_session *sess, u32 cmdsn) 242{ 243 u32 max_cmdsn; 244 int ret; 245 246 /* 247 * This is the proper method of checking received CmdSN against 248 * ExpCmdSN and MaxCmdSN values, as well as accounting for out 249 * or order CmdSNs due to multiple connection sessions and/or 250 * CRC failures. 251 */ 252 max_cmdsn = atomic_read(&sess->max_cmd_sn); 253 if (iscsi_sna_gt(cmdsn, max_cmdsn)) { 254 pr_err("Received CmdSN: 0x%08x is greater than" 255 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn); 256 ret = CMDSN_MAXCMDSN_OVERRUN; 257 258 } else if (cmdsn == sess->exp_cmd_sn) { 259 sess->exp_cmd_sn++; 260 pr_debug("Received CmdSN matches ExpCmdSN," 261 " incremented ExpCmdSN to: 0x%08x\n", 262 sess->exp_cmd_sn); 263 ret = CMDSN_NORMAL_OPERATION; 264 265 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) { 266 pr_debug("Received CmdSN: 0x%08x is greater" 267 " than ExpCmdSN: 0x%08x, not acknowledging.\n", 268 cmdsn, sess->exp_cmd_sn); 269 ret = CMDSN_HIGHER_THAN_EXP; 270 271 } else { 272 pr_err("Received CmdSN: 0x%08x is less than" 273 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn, 274 sess->exp_cmd_sn); 275 ret = CMDSN_LOWER_THAN_EXP; 276 } 277 278 return ret; 279} 280 281/* 282 * Commands may be received out of order if MC/S is in use. 283 * Ensure they are executed in CmdSN order. 284 */ 285int iscsit_sequence_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd, 286 unsigned char *buf, __be32 cmdsn) 287{ 288 int ret, cmdsn_ret; 289 bool reject = false; 290 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES; 291 292 mutex_lock(&conn->sess->cmdsn_mutex); 293 294 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn)); 295 switch (cmdsn_ret) { 296 case CMDSN_NORMAL_OPERATION: 297 ret = iscsit_execute_cmd(cmd, 0); 298 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list)) 299 iscsit_execute_ooo_cmdsns(conn->sess); 300 else if (ret < 0) { 301 reject = true; 302 ret = CMDSN_ERROR_CANNOT_RECOVER; 303 } 304 break; 305 case CMDSN_HIGHER_THAN_EXP: 306 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn)); 307 if (ret < 0) { 308 reject = true; 309 ret = CMDSN_ERROR_CANNOT_RECOVER; 310 break; 311 } 312 ret = CMDSN_HIGHER_THAN_EXP; 313 break; 314 case CMDSN_LOWER_THAN_EXP: 315 case CMDSN_MAXCMDSN_OVERRUN: 316 default: 317 cmd->i_state = ISTATE_REMOVE; 318 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 319 /* 320 * Existing callers for iscsit_sequence_cmd() will silently 321 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this 322 * return for CMDSN_MAXCMDSN_OVERRUN as well.. 323 */ 324 ret = CMDSN_LOWER_THAN_EXP; 325 break; 326 } 327 mutex_unlock(&conn->sess->cmdsn_mutex); 328 329 if (reject) 330 iscsit_reject_cmd(cmd, reason, buf); 331 332 return ret; 333} 334EXPORT_SYMBOL(iscsit_sequence_cmd); 335 336int iscsit_check_unsolicited_dataout(struct iscsit_cmd *cmd, unsigned char *buf) 337{ 338 struct iscsit_conn *conn = cmd->conn; 339 struct se_cmd *se_cmd = &cmd->se_cmd; 340 struct iscsi_data *hdr = (struct iscsi_data *) buf; 341 u32 payload_length = ntoh24(hdr->dlength); 342 343 if (conn->sess->sess_ops->InitialR2T) { 344 pr_err("Received unexpected unsolicited data" 345 " while InitialR2T=Yes, protocol error.\n"); 346 transport_send_check_condition_and_sense(se_cmd, 347 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 348 return -1; 349 } 350 351 if ((cmd->first_burst_len + payload_length) > 352 conn->sess->sess_ops->FirstBurstLength) { 353 pr_err("Total %u bytes exceeds FirstBurstLength: %u" 354 " for this Unsolicited DataOut Burst.\n", 355 (cmd->first_burst_len + payload_length), 356 conn->sess->sess_ops->FirstBurstLength); 357 transport_send_check_condition_and_sense(se_cmd, 358 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 359 return -1; 360 } 361 362 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) 363 return 0; 364 365 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) && 366 ((cmd->first_burst_len + payload_length) != 367 conn->sess->sess_ops->FirstBurstLength)) { 368 pr_err("Unsolicited non-immediate data received %u" 369 " does not equal FirstBurstLength: %u, and does" 370 " not equal ExpXferLen %u.\n", 371 (cmd->first_burst_len + payload_length), 372 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length); 373 transport_send_check_condition_and_sense(se_cmd, 374 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 375 return -1; 376 } 377 return 0; 378} 379 380struct iscsit_cmd *iscsit_find_cmd_from_itt( 381 struct iscsit_conn *conn, 382 itt_t init_task_tag) 383{ 384 struct iscsit_cmd *cmd; 385 386 spin_lock_bh(&conn->cmd_lock); 387 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 388 if (cmd->init_task_tag == init_task_tag) { 389 spin_unlock_bh(&conn->cmd_lock); 390 return cmd; 391 } 392 } 393 spin_unlock_bh(&conn->cmd_lock); 394 395 pr_err("Unable to locate ITT: 0x%08x on CID: %hu", 396 init_task_tag, conn->cid); 397 return NULL; 398} 399EXPORT_SYMBOL(iscsit_find_cmd_from_itt); 400 401struct iscsit_cmd *iscsit_find_cmd_from_itt_or_dump( 402 struct iscsit_conn *conn, 403 itt_t init_task_tag, 404 u32 length) 405{ 406 struct iscsit_cmd *cmd; 407 408 spin_lock_bh(&conn->cmd_lock); 409 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 410 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) 411 continue; 412 if (cmd->init_task_tag == init_task_tag) { 413 spin_unlock_bh(&conn->cmd_lock); 414 return cmd; 415 } 416 } 417 spin_unlock_bh(&conn->cmd_lock); 418 419 pr_err("Unable to locate ITT: 0x%08x on CID: %hu," 420 " dumping payload\n", init_task_tag, conn->cid); 421 if (length) 422 iscsit_dump_data_payload(conn, length, 1); 423 424 return NULL; 425} 426EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump); 427 428struct iscsit_cmd *iscsit_find_cmd_from_ttt( 429 struct iscsit_conn *conn, 430 u32 targ_xfer_tag) 431{ 432 struct iscsit_cmd *cmd = NULL; 433 434 spin_lock_bh(&conn->cmd_lock); 435 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 436 if (cmd->targ_xfer_tag == targ_xfer_tag) { 437 spin_unlock_bh(&conn->cmd_lock); 438 return cmd; 439 } 440 } 441 spin_unlock_bh(&conn->cmd_lock); 442 443 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n", 444 targ_xfer_tag, conn->cid); 445 return NULL; 446} 447 448int iscsit_find_cmd_for_recovery( 449 struct iscsit_session *sess, 450 struct iscsit_cmd **cmd_ptr, 451 struct iscsi_conn_recovery **cr_ptr, 452 itt_t init_task_tag) 453{ 454 struct iscsit_cmd *cmd = NULL; 455 struct iscsi_conn_recovery *cr; 456 /* 457 * Scan through the inactive connection recovery list's command list. 458 * If init_task_tag matches the command is still alligent. 459 */ 460 spin_lock(&sess->cr_i_lock); 461 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { 462 spin_lock(&cr->conn_recovery_cmd_lock); 463 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 464 if (cmd->init_task_tag == init_task_tag) { 465 spin_unlock(&cr->conn_recovery_cmd_lock); 466 spin_unlock(&sess->cr_i_lock); 467 468 *cr_ptr = cr; 469 *cmd_ptr = cmd; 470 return -2; 471 } 472 } 473 spin_unlock(&cr->conn_recovery_cmd_lock); 474 } 475 spin_unlock(&sess->cr_i_lock); 476 /* 477 * Scan through the active connection recovery list's command list. 478 * If init_task_tag matches the command is ready to be reassigned. 479 */ 480 spin_lock(&sess->cr_a_lock); 481 list_for_each_entry(cr, &sess->cr_active_list, cr_list) { 482 spin_lock(&cr->conn_recovery_cmd_lock); 483 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 484 if (cmd->init_task_tag == init_task_tag) { 485 spin_unlock(&cr->conn_recovery_cmd_lock); 486 spin_unlock(&sess->cr_a_lock); 487 488 *cr_ptr = cr; 489 *cmd_ptr = cmd; 490 return 0; 491 } 492 } 493 spin_unlock(&cr->conn_recovery_cmd_lock); 494 } 495 spin_unlock(&sess->cr_a_lock); 496 497 return -1; 498} 499 500void iscsit_add_cmd_to_immediate_queue( 501 struct iscsit_cmd *cmd, 502 struct iscsit_conn *conn, 503 u8 state) 504{ 505 struct iscsi_queue_req *qr; 506 507 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 508 if (!qr) { 509 pr_err("Unable to allocate memory for" 510 " struct iscsi_queue_req\n"); 511 return; 512 } 513 INIT_LIST_HEAD(&qr->qr_list); 514 qr->cmd = cmd; 515 qr->state = state; 516 517 spin_lock_bh(&conn->immed_queue_lock); 518 list_add_tail(&qr->qr_list, &conn->immed_queue_list); 519 atomic_inc(&cmd->immed_queue_count); 520 atomic_set(&conn->check_immediate_queue, 1); 521 spin_unlock_bh(&conn->immed_queue_lock); 522 523 wake_up(&conn->queues_wq); 524} 525EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue); 526 527struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsit_conn *conn) 528{ 529 struct iscsi_queue_req *qr; 530 531 spin_lock_bh(&conn->immed_queue_lock); 532 if (list_empty(&conn->immed_queue_list)) { 533 spin_unlock_bh(&conn->immed_queue_lock); 534 return NULL; 535 } 536 qr = list_first_entry(&conn->immed_queue_list, 537 struct iscsi_queue_req, qr_list); 538 539 list_del(&qr->qr_list); 540 if (qr->cmd) 541 atomic_dec(&qr->cmd->immed_queue_count); 542 spin_unlock_bh(&conn->immed_queue_lock); 543 544 return qr; 545} 546 547static void iscsit_remove_cmd_from_immediate_queue( 548 struct iscsit_cmd *cmd, 549 struct iscsit_conn *conn) 550{ 551 struct iscsi_queue_req *qr, *qr_tmp; 552 553 spin_lock_bh(&conn->immed_queue_lock); 554 if (!atomic_read(&cmd->immed_queue_count)) { 555 spin_unlock_bh(&conn->immed_queue_lock); 556 return; 557 } 558 559 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 560 if (qr->cmd != cmd) 561 continue; 562 563 atomic_dec(&qr->cmd->immed_queue_count); 564 list_del(&qr->qr_list); 565 kmem_cache_free(lio_qr_cache, qr); 566 } 567 spin_unlock_bh(&conn->immed_queue_lock); 568 569 if (atomic_read(&cmd->immed_queue_count)) { 570 pr_err("ITT: 0x%08x immed_queue_count: %d\n", 571 cmd->init_task_tag, 572 atomic_read(&cmd->immed_queue_count)); 573 } 574} 575 576int iscsit_add_cmd_to_response_queue( 577 struct iscsit_cmd *cmd, 578 struct iscsit_conn *conn, 579 u8 state) 580{ 581 struct iscsi_queue_req *qr; 582 583 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 584 if (!qr) { 585 pr_err("Unable to allocate memory for" 586 " struct iscsi_queue_req\n"); 587 return -ENOMEM; 588 } 589 INIT_LIST_HEAD(&qr->qr_list); 590 qr->cmd = cmd; 591 qr->state = state; 592 593 spin_lock_bh(&conn->response_queue_lock); 594 list_add_tail(&qr->qr_list, &conn->response_queue_list); 595 atomic_inc(&cmd->response_queue_count); 596 spin_unlock_bh(&conn->response_queue_lock); 597 598 wake_up(&conn->queues_wq); 599 return 0; 600} 601 602struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsit_conn *conn) 603{ 604 struct iscsi_queue_req *qr; 605 606 spin_lock_bh(&conn->response_queue_lock); 607 if (list_empty(&conn->response_queue_list)) { 608 spin_unlock_bh(&conn->response_queue_lock); 609 return NULL; 610 } 611 612 qr = list_first_entry(&conn->response_queue_list, 613 struct iscsi_queue_req, qr_list); 614 615 list_del(&qr->qr_list); 616 if (qr->cmd) 617 atomic_dec(&qr->cmd->response_queue_count); 618 spin_unlock_bh(&conn->response_queue_lock); 619 620 return qr; 621} 622 623static void iscsit_remove_cmd_from_response_queue( 624 struct iscsit_cmd *cmd, 625 struct iscsit_conn *conn) 626{ 627 struct iscsi_queue_req *qr, *qr_tmp; 628 629 spin_lock_bh(&conn->response_queue_lock); 630 if (!atomic_read(&cmd->response_queue_count)) { 631 spin_unlock_bh(&conn->response_queue_lock); 632 return; 633 } 634 635 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 636 qr_list) { 637 if (qr->cmd != cmd) 638 continue; 639 640 atomic_dec(&qr->cmd->response_queue_count); 641 list_del(&qr->qr_list); 642 kmem_cache_free(lio_qr_cache, qr); 643 } 644 spin_unlock_bh(&conn->response_queue_lock); 645 646 if (atomic_read(&cmd->response_queue_count)) { 647 pr_err("ITT: 0x%08x response_queue_count: %d\n", 648 cmd->init_task_tag, 649 atomic_read(&cmd->response_queue_count)); 650 } 651} 652 653bool iscsit_conn_all_queues_empty(struct iscsit_conn *conn) 654{ 655 bool empty; 656 657 spin_lock_bh(&conn->immed_queue_lock); 658 empty = list_empty(&conn->immed_queue_list); 659 spin_unlock_bh(&conn->immed_queue_lock); 660 661 if (!empty) 662 return empty; 663 664 spin_lock_bh(&conn->response_queue_lock); 665 empty = list_empty(&conn->response_queue_list); 666 spin_unlock_bh(&conn->response_queue_lock); 667 668 return empty; 669} 670 671void iscsit_free_queue_reqs_for_conn(struct iscsit_conn *conn) 672{ 673 struct iscsi_queue_req *qr, *qr_tmp; 674 675 spin_lock_bh(&conn->immed_queue_lock); 676 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 677 list_del(&qr->qr_list); 678 if (qr->cmd) 679 atomic_dec(&qr->cmd->immed_queue_count); 680 681 kmem_cache_free(lio_qr_cache, qr); 682 } 683 spin_unlock_bh(&conn->immed_queue_lock); 684 685 spin_lock_bh(&conn->response_queue_lock); 686 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 687 qr_list) { 688 list_del(&qr->qr_list); 689 if (qr->cmd) 690 atomic_dec(&qr->cmd->response_queue_count); 691 692 kmem_cache_free(lio_qr_cache, qr); 693 } 694 spin_unlock_bh(&conn->response_queue_lock); 695} 696 697void iscsit_release_cmd(struct iscsit_cmd *cmd) 698{ 699 struct iscsit_session *sess; 700 struct se_cmd *se_cmd = &cmd->se_cmd; 701 702 WARN_ON(!list_empty(&cmd->i_conn_node)); 703 704 if (cmd->conn) 705 sess = cmd->conn->sess; 706 else 707 sess = cmd->sess; 708 709 BUG_ON(!sess || !sess->se_sess); 710 711 kfree(cmd->buf_ptr); 712 kfree(cmd->pdu_list); 713 kfree(cmd->seq_list); 714 kfree(cmd->tmr_req); 715 kfree(cmd->overflow_buf); 716 kfree(cmd->iov_data); 717 kfree(cmd->text_in_ptr); 718 719 target_free_tag(sess->se_sess, se_cmd); 720} 721EXPORT_SYMBOL(iscsit_release_cmd); 722 723void __iscsit_free_cmd(struct iscsit_cmd *cmd, bool check_queues) 724{ 725 struct iscsit_conn *conn = cmd->conn; 726 727 WARN_ON(!list_empty(&cmd->i_conn_node)); 728 729 if (cmd->data_direction == DMA_TO_DEVICE) { 730 iscsit_stop_dataout_timer(cmd); 731 iscsit_free_r2ts_from_list(cmd); 732 } 733 if (cmd->data_direction == DMA_FROM_DEVICE) 734 iscsit_free_all_datain_reqs(cmd); 735 736 if (conn && check_queues) { 737 iscsit_remove_cmd_from_immediate_queue(cmd, conn); 738 iscsit_remove_cmd_from_response_queue(cmd, conn); 739 } 740 741 if (conn && conn->conn_transport->iscsit_unmap_cmd) 742 conn->conn_transport->iscsit_unmap_cmd(conn, cmd); 743} 744 745void iscsit_free_cmd(struct iscsit_cmd *cmd, bool shutdown) 746{ 747 struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL; 748 int rc; 749 750 WARN_ON(!list_empty(&cmd->i_conn_node)); 751 752 __iscsit_free_cmd(cmd, shutdown); 753 if (se_cmd) { 754 rc = transport_generic_free_cmd(se_cmd, shutdown); 755 if (!rc && shutdown && se_cmd->se_sess) { 756 __iscsit_free_cmd(cmd, shutdown); 757 target_put_sess_cmd(se_cmd); 758 } 759 } else { 760 iscsit_release_cmd(cmd); 761 } 762} 763EXPORT_SYMBOL(iscsit_free_cmd); 764 765bool iscsit_check_session_usage_count(struct iscsit_session *sess, 766 bool can_sleep) 767{ 768 spin_lock_bh(&sess->session_usage_lock); 769 if (sess->session_usage_count != 0) { 770 sess->session_waiting_on_uc = 1; 771 spin_unlock_bh(&sess->session_usage_lock); 772 if (!can_sleep) 773 return true; 774 775 wait_for_completion(&sess->session_waiting_on_uc_comp); 776 return false; 777 } 778 spin_unlock_bh(&sess->session_usage_lock); 779 780 return false; 781} 782 783void iscsit_dec_session_usage_count(struct iscsit_session *sess) 784{ 785 spin_lock_bh(&sess->session_usage_lock); 786 sess->session_usage_count--; 787 788 if (!sess->session_usage_count && sess->session_waiting_on_uc) 789 complete(&sess->session_waiting_on_uc_comp); 790 791 spin_unlock_bh(&sess->session_usage_lock); 792} 793 794void iscsit_inc_session_usage_count(struct iscsit_session *sess) 795{ 796 spin_lock_bh(&sess->session_usage_lock); 797 sess->session_usage_count++; 798 spin_unlock_bh(&sess->session_usage_lock); 799} 800 801struct iscsit_conn *iscsit_get_conn_from_cid(struct iscsit_session *sess, u16 cid) 802{ 803 struct iscsit_conn *conn; 804 805 spin_lock_bh(&sess->conn_lock); 806 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 807 if ((conn->cid == cid) && 808 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) { 809 iscsit_inc_conn_usage_count(conn); 810 spin_unlock_bh(&sess->conn_lock); 811 return conn; 812 } 813 } 814 spin_unlock_bh(&sess->conn_lock); 815 816 return NULL; 817} 818 819struct iscsit_conn *iscsit_get_conn_from_cid_rcfr(struct iscsit_session *sess, u16 cid) 820{ 821 struct iscsit_conn *conn; 822 823 spin_lock_bh(&sess->conn_lock); 824 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 825 if (conn->cid == cid) { 826 iscsit_inc_conn_usage_count(conn); 827 spin_lock(&conn->state_lock); 828 atomic_set(&conn->connection_wait_rcfr, 1); 829 spin_unlock(&conn->state_lock); 830 spin_unlock_bh(&sess->conn_lock); 831 return conn; 832 } 833 } 834 spin_unlock_bh(&sess->conn_lock); 835 836 return NULL; 837} 838 839void iscsit_check_conn_usage_count(struct iscsit_conn *conn) 840{ 841 spin_lock_bh(&conn->conn_usage_lock); 842 if (conn->conn_usage_count != 0) { 843 conn->conn_waiting_on_uc = 1; 844 spin_unlock_bh(&conn->conn_usage_lock); 845 846 wait_for_completion(&conn->conn_waiting_on_uc_comp); 847 return; 848 } 849 spin_unlock_bh(&conn->conn_usage_lock); 850} 851 852void iscsit_dec_conn_usage_count(struct iscsit_conn *conn) 853{ 854 spin_lock_bh(&conn->conn_usage_lock); 855 conn->conn_usage_count--; 856 857 if (!conn->conn_usage_count && conn->conn_waiting_on_uc) 858 complete(&conn->conn_waiting_on_uc_comp); 859 860 spin_unlock_bh(&conn->conn_usage_lock); 861} 862 863void iscsit_inc_conn_usage_count(struct iscsit_conn *conn) 864{ 865 spin_lock_bh(&conn->conn_usage_lock); 866 conn->conn_usage_count++; 867 spin_unlock_bh(&conn->conn_usage_lock); 868} 869 870static int iscsit_add_nopin(struct iscsit_conn *conn, int want_response) 871{ 872 u8 state; 873 struct iscsit_cmd *cmd; 874 875 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING); 876 if (!cmd) 877 return -1; 878 879 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN; 880 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE : 881 ISTATE_SEND_NOPIN_NO_RESPONSE; 882 cmd->init_task_tag = RESERVED_ITT; 883 cmd->targ_xfer_tag = (want_response) ? 884 session_get_next_ttt(conn->sess) : 0xFFFFFFFF; 885 spin_lock_bh(&conn->cmd_lock); 886 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 887 spin_unlock_bh(&conn->cmd_lock); 888 889 if (want_response) 890 iscsit_start_nopin_response_timer(conn); 891 iscsit_add_cmd_to_immediate_queue(cmd, conn, state); 892 893 return 0; 894} 895 896void iscsit_handle_nopin_response_timeout(struct timer_list *t) 897{ 898 struct iscsit_conn *conn = from_timer(conn, t, nopin_response_timer); 899 struct iscsit_session *sess = conn->sess; 900 901 iscsit_inc_conn_usage_count(conn); 902 903 spin_lock_bh(&conn->nopin_timer_lock); 904 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) { 905 spin_unlock_bh(&conn->nopin_timer_lock); 906 iscsit_dec_conn_usage_count(conn); 907 return; 908 } 909 910 pr_err("Did not receive response to NOPIN on CID: %hu, failing" 911 " connection for I_T Nexus %s,i,0x%6phN,%s,t,0x%02x\n", 912 conn->cid, sess->sess_ops->InitiatorName, sess->isid, 913 sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt); 914 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 915 spin_unlock_bh(&conn->nopin_timer_lock); 916 917 iscsit_fill_cxn_timeout_err_stats(sess); 918 iscsit_cause_connection_reinstatement(conn, 0); 919 iscsit_dec_conn_usage_count(conn); 920} 921 922void iscsit_mod_nopin_response_timer(struct iscsit_conn *conn) 923{ 924 struct iscsit_session *sess = conn->sess; 925 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 926 927 spin_lock_bh(&conn->nopin_timer_lock); 928 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 929 spin_unlock_bh(&conn->nopin_timer_lock); 930 return; 931 } 932 933 mod_timer(&conn->nopin_response_timer, 934 (get_jiffies_64() + na->nopin_response_timeout * HZ)); 935 spin_unlock_bh(&conn->nopin_timer_lock); 936} 937 938void iscsit_start_nopin_response_timer(struct iscsit_conn *conn) 939{ 940 struct iscsit_session *sess = conn->sess; 941 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 942 943 spin_lock_bh(&conn->nopin_timer_lock); 944 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) { 945 spin_unlock_bh(&conn->nopin_timer_lock); 946 return; 947 } 948 949 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; 950 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; 951 mod_timer(&conn->nopin_response_timer, 952 jiffies + na->nopin_response_timeout * HZ); 953 954 pr_debug("Started NOPIN Response Timer on CID: %d to %u" 955 " seconds\n", conn->cid, na->nopin_response_timeout); 956 spin_unlock_bh(&conn->nopin_timer_lock); 957} 958 959void iscsit_stop_nopin_response_timer(struct iscsit_conn *conn) 960{ 961 spin_lock_bh(&conn->nopin_timer_lock); 962 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 963 spin_unlock_bh(&conn->nopin_timer_lock); 964 return; 965 } 966 conn->nopin_response_timer_flags |= ISCSI_TF_STOP; 967 spin_unlock_bh(&conn->nopin_timer_lock); 968 969 del_timer_sync(&conn->nopin_response_timer); 970 971 spin_lock_bh(&conn->nopin_timer_lock); 972 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 973 spin_unlock_bh(&conn->nopin_timer_lock); 974} 975 976void iscsit_handle_nopin_timeout(struct timer_list *t) 977{ 978 struct iscsit_conn *conn = from_timer(conn, t, nopin_timer); 979 980 iscsit_inc_conn_usage_count(conn); 981 982 spin_lock_bh(&conn->nopin_timer_lock); 983 if (conn->nopin_timer_flags & ISCSI_TF_STOP) { 984 spin_unlock_bh(&conn->nopin_timer_lock); 985 iscsit_dec_conn_usage_count(conn); 986 return; 987 } 988 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 989 spin_unlock_bh(&conn->nopin_timer_lock); 990 991 iscsit_add_nopin(conn, 1); 992 iscsit_dec_conn_usage_count(conn); 993} 994 995void __iscsit_start_nopin_timer(struct iscsit_conn *conn) 996{ 997 struct iscsit_session *sess = conn->sess; 998 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 999 1000 lockdep_assert_held(&conn->nopin_timer_lock); 1001 1002 /* 1003 * NOPIN timeout is disabled. 1004 */ 1005 if (!na->nopin_timeout) 1006 return; 1007 1008 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) 1009 return; 1010 1011 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1012 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1013 mod_timer(&conn->nopin_timer, jiffies + na->nopin_timeout * HZ); 1014 1015 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1016 " interval\n", conn->cid, na->nopin_timeout); 1017} 1018 1019void iscsit_start_nopin_timer(struct iscsit_conn *conn) 1020{ 1021 spin_lock_bh(&conn->nopin_timer_lock); 1022 __iscsit_start_nopin_timer(conn); 1023 spin_unlock_bh(&conn->nopin_timer_lock); 1024} 1025 1026void iscsit_stop_nopin_timer(struct iscsit_conn *conn) 1027{ 1028 spin_lock_bh(&conn->nopin_timer_lock); 1029 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) { 1030 spin_unlock_bh(&conn->nopin_timer_lock); 1031 return; 1032 } 1033 conn->nopin_timer_flags |= ISCSI_TF_STOP; 1034 spin_unlock_bh(&conn->nopin_timer_lock); 1035 1036 del_timer_sync(&conn->nopin_timer); 1037 1038 spin_lock_bh(&conn->nopin_timer_lock); 1039 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1040 spin_unlock_bh(&conn->nopin_timer_lock); 1041} 1042 1043void iscsit_login_timeout(struct timer_list *t) 1044{ 1045 struct iscsit_conn *conn = from_timer(conn, t, login_timer); 1046 struct iscsi_login *login = conn->login; 1047 1048 pr_debug("Entering iscsi_target_login_timeout >>>>>>>>>>>>>>>>>>>\n"); 1049 1050 spin_lock_bh(&conn->login_timer_lock); 1051 login->login_failed = 1; 1052 1053 if (conn->login_kworker) { 1054 pr_debug("Sending SIGINT to conn->login_kworker %s/%d\n", 1055 conn->login_kworker->comm, conn->login_kworker->pid); 1056 send_sig(SIGINT, conn->login_kworker, 1); 1057 } else { 1058 schedule_delayed_work(&conn->login_work, 0); 1059 } 1060 spin_unlock_bh(&conn->login_timer_lock); 1061} 1062 1063void iscsit_start_login_timer(struct iscsit_conn *conn, struct task_struct *kthr) 1064{ 1065 pr_debug("Login timer started\n"); 1066 1067 conn->login_kworker = kthr; 1068 mod_timer(&conn->login_timer, jiffies + TA_LOGIN_TIMEOUT * HZ); 1069} 1070 1071int iscsit_set_login_timer_kworker(struct iscsit_conn *conn, struct task_struct *kthr) 1072{ 1073 struct iscsi_login *login = conn->login; 1074 int ret = 0; 1075 1076 spin_lock_bh(&conn->login_timer_lock); 1077 if (login->login_failed) { 1078 /* The timer has already expired */ 1079 ret = -1; 1080 } else { 1081 conn->login_kworker = kthr; 1082 } 1083 spin_unlock_bh(&conn->login_timer_lock); 1084 1085 return ret; 1086} 1087 1088void iscsit_stop_login_timer(struct iscsit_conn *conn) 1089{ 1090 pr_debug("Login timer stopped\n"); 1091 timer_delete_sync(&conn->login_timer); 1092} 1093 1094int iscsit_send_tx_data( 1095 struct iscsit_cmd *cmd, 1096 struct iscsit_conn *conn, 1097 int use_misc) 1098{ 1099 int tx_sent, tx_size; 1100 u32 iov_count; 1101 struct kvec *iov; 1102 1103send_data: 1104 tx_size = cmd->tx_size; 1105 1106 if (!use_misc) { 1107 iov = &cmd->iov_data[0]; 1108 iov_count = cmd->iov_data_count; 1109 } else { 1110 iov = &cmd->iov_misc[0]; 1111 iov_count = cmd->iov_misc_count; 1112 } 1113 1114 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size); 1115 if (tx_size != tx_sent) { 1116 if (tx_sent == -EAGAIN) { 1117 pr_err("tx_data() returned -EAGAIN\n"); 1118 goto send_data; 1119 } else 1120 return -1; 1121 } 1122 cmd->tx_size = 0; 1123 1124 return 0; 1125} 1126 1127int iscsit_fe_sendpage_sg( 1128 struct iscsit_cmd *cmd, 1129 struct iscsit_conn *conn) 1130{ 1131 struct scatterlist *sg = cmd->first_data_sg; 1132 struct bio_vec bvec; 1133 struct msghdr msghdr = { .msg_flags = MSG_SPLICE_PAGES, }; 1134 struct kvec iov; 1135 u32 tx_hdr_size, data_len; 1136 u32 offset = cmd->first_data_sg_off; 1137 int tx_sent, iov_off; 1138 1139send_hdr: 1140 tx_hdr_size = ISCSI_HDR_LEN; 1141 if (conn->conn_ops->HeaderDigest) 1142 tx_hdr_size += ISCSI_CRC_LEN; 1143 1144 iov.iov_base = cmd->pdu; 1145 iov.iov_len = tx_hdr_size; 1146 1147 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size); 1148 if (tx_hdr_size != tx_sent) { 1149 if (tx_sent == -EAGAIN) { 1150 pr_err("tx_data() returned -EAGAIN\n"); 1151 goto send_hdr; 1152 } 1153 return -1; 1154 } 1155 1156 data_len = cmd->tx_size - tx_hdr_size - cmd->padding; 1157 /* 1158 * Set iov_off used by padding and data digest tx_data() calls below 1159 * in order to determine proper offset into cmd->iov_data[] 1160 */ 1161 if (conn->conn_ops->DataDigest) { 1162 data_len -= ISCSI_CRC_LEN; 1163 if (cmd->padding) 1164 iov_off = (cmd->iov_data_count - 2); 1165 else 1166 iov_off = (cmd->iov_data_count - 1); 1167 } else { 1168 iov_off = (cmd->iov_data_count - 1); 1169 } 1170 /* 1171 * Perform sendpage() for each page in the scatterlist 1172 */ 1173 while (data_len) { 1174 u32 space = (sg->length - offset); 1175 u32 sub_len = min_t(u32, data_len, space); 1176send_pg: 1177 bvec_set_page(&bvec, sg_page(sg), sub_len, sg->offset + offset); 1178 iov_iter_bvec(&msghdr.msg_iter, ITER_SOURCE, &bvec, 1, sub_len); 1179 1180 tx_sent = conn->sock->ops->sendmsg(conn->sock, &msghdr, 1181 sub_len); 1182 if (tx_sent != sub_len) { 1183 if (tx_sent == -EAGAIN) { 1184 pr_err("sendmsg/splice returned -EAGAIN\n"); 1185 goto send_pg; 1186 } 1187 1188 pr_err("sendmsg/splice failure: %d\n", tx_sent); 1189 return -1; 1190 } 1191 1192 data_len -= sub_len; 1193 offset = 0; 1194 sg = sg_next(sg); 1195 } 1196 1197send_padding: 1198 if (cmd->padding) { 1199 struct kvec *iov_p = &cmd->iov_data[iov_off++]; 1200 1201 tx_sent = tx_data(conn, iov_p, 1, cmd->padding); 1202 if (cmd->padding != tx_sent) { 1203 if (tx_sent == -EAGAIN) { 1204 pr_err("tx_data() returned -EAGAIN\n"); 1205 goto send_padding; 1206 } 1207 return -1; 1208 } 1209 } 1210 1211send_datacrc: 1212 if (conn->conn_ops->DataDigest) { 1213 struct kvec *iov_d = &cmd->iov_data[iov_off]; 1214 1215 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN); 1216 if (ISCSI_CRC_LEN != tx_sent) { 1217 if (tx_sent == -EAGAIN) { 1218 pr_err("tx_data() returned -EAGAIN\n"); 1219 goto send_datacrc; 1220 } 1221 return -1; 1222 } 1223 } 1224 1225 return 0; 1226} 1227 1228/* 1229 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU 1230 * back to the Initiator when an expection condition occurs with the 1231 * errors set in status_class and status_detail. 1232 * 1233 * Parameters: iSCSI Connection, Status Class, Status Detail. 1234 * Returns: 0 on success, -1 on error. 1235 */ 1236int iscsit_tx_login_rsp(struct iscsit_conn *conn, u8 status_class, u8 status_detail) 1237{ 1238 struct iscsi_login_rsp *hdr; 1239 struct iscsi_login *login = conn->conn_login; 1240 1241 login->login_failed = 1; 1242 iscsit_collect_login_stats(conn, status_class, status_detail); 1243 1244 memset(&login->rsp[0], 0, ISCSI_HDR_LEN); 1245 1246 hdr = (struct iscsi_login_rsp *)&login->rsp[0]; 1247 hdr->opcode = ISCSI_OP_LOGIN_RSP; 1248 hdr->status_class = status_class; 1249 hdr->status_detail = status_detail; 1250 hdr->itt = conn->login_itt; 1251 1252 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0); 1253} 1254 1255void iscsit_print_session_params(struct iscsit_session *sess) 1256{ 1257 struct iscsit_conn *conn; 1258 1259 pr_debug("-----------------------------[Session Params for" 1260 " SID: %u]-----------------------------\n", sess->sid); 1261 spin_lock_bh(&sess->conn_lock); 1262 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 1263 iscsi_dump_conn_ops(conn->conn_ops); 1264 spin_unlock_bh(&sess->conn_lock); 1265 1266 iscsi_dump_sess_ops(sess->sess_ops); 1267} 1268 1269int rx_data( 1270 struct iscsit_conn *conn, 1271 struct kvec *iov, 1272 int iov_count, 1273 int data) 1274{ 1275 int rx_loop = 0, total_rx = 0; 1276 struct msghdr msg; 1277 1278 if (!conn || !conn->sock || !conn->conn_ops) 1279 return -1; 1280 1281 memset(&msg, 0, sizeof(struct msghdr)); 1282 iov_iter_kvec(&msg.msg_iter, ITER_DEST, iov, iov_count, data); 1283 1284 while (msg_data_left(&msg)) { 1285 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL); 1286 if (rx_loop <= 0) { 1287 pr_debug("rx_loop: %d total_rx: %d\n", 1288 rx_loop, total_rx); 1289 return rx_loop; 1290 } 1291 total_rx += rx_loop; 1292 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n", 1293 rx_loop, total_rx, data); 1294 } 1295 1296 return total_rx; 1297} 1298 1299int tx_data( 1300 struct iscsit_conn *conn, 1301 struct kvec *iov, 1302 int iov_count, 1303 int data) 1304{ 1305 struct msghdr msg; 1306 int total_tx = 0; 1307 1308 if (!conn || !conn->sock || !conn->conn_ops) 1309 return -1; 1310 1311 if (data <= 0) { 1312 pr_err("Data length is: %d\n", data); 1313 return -1; 1314 } 1315 1316 memset(&msg, 0, sizeof(struct msghdr)); 1317 1318 iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, iov_count, data); 1319 1320 while (msg_data_left(&msg)) { 1321 int tx_loop = sock_sendmsg(conn->sock, &msg); 1322 if (tx_loop <= 0) { 1323 pr_debug("tx_loop: %d total_tx %d\n", 1324 tx_loop, total_tx); 1325 return tx_loop; 1326 } 1327 total_tx += tx_loop; 1328 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n", 1329 tx_loop, total_tx, data); 1330 } 1331 1332 return total_tx; 1333} 1334 1335void iscsit_collect_login_stats( 1336 struct iscsit_conn *conn, 1337 u8 status_class, 1338 u8 status_detail) 1339{ 1340 struct iscsi_param *intrname = NULL; 1341 struct iscsi_tiqn *tiqn; 1342 struct iscsi_login_stats *ls; 1343 1344 tiqn = iscsit_snmp_get_tiqn(conn); 1345 if (!tiqn) 1346 return; 1347 1348 ls = &tiqn->login_stats; 1349 1350 spin_lock(&ls->lock); 1351 if (status_class == ISCSI_STATUS_CLS_SUCCESS) 1352 ls->accepts++; 1353 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) { 1354 ls->redirects++; 1355 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT; 1356 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1357 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) { 1358 ls->authenticate_fails++; 1359 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE; 1360 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1361 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) { 1362 ls->authorize_fails++; 1363 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE; 1364 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1365 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) { 1366 ls->negotiate_fails++; 1367 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE; 1368 } else { 1369 ls->other_fails++; 1370 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER; 1371 } 1372 1373 /* Save initiator name, ip address and time, if it is a failed login */ 1374 if (status_class != ISCSI_STATUS_CLS_SUCCESS) { 1375 if (conn->param_list) 1376 intrname = iscsi_find_param_from_key(INITIATORNAME, 1377 conn->param_list); 1378 strscpy(ls->last_intr_fail_name, 1379 (intrname ? intrname->value : "Unknown"), 1380 sizeof(ls->last_intr_fail_name)); 1381 1382 ls->last_intr_fail_ip_family = conn->login_family; 1383 1384 ls->last_intr_fail_sockaddr = conn->login_sockaddr; 1385 ls->last_fail_time = get_jiffies_64(); 1386 } 1387 1388 spin_unlock(&ls->lock); 1389} 1390 1391struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsit_conn *conn) 1392{ 1393 struct iscsi_portal_group *tpg; 1394 1395 if (!conn) 1396 return NULL; 1397 1398 tpg = conn->tpg; 1399 if (!tpg) 1400 return NULL; 1401 1402 if (!tpg->tpg_tiqn) 1403 return NULL; 1404 1405 return tpg->tpg_tiqn; 1406} 1407 1408void iscsit_fill_cxn_timeout_err_stats(struct iscsit_session *sess) 1409{ 1410 struct iscsi_portal_group *tpg = sess->tpg; 1411 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 1412 1413 if (!tiqn) 1414 return; 1415 1416 spin_lock_bh(&tiqn->sess_err_stats.lock); 1417 strscpy(tiqn->sess_err_stats.last_sess_fail_rem_name, 1418 sess->sess_ops->InitiatorName, 1419 sizeof(tiqn->sess_err_stats.last_sess_fail_rem_name)); 1420 tiqn->sess_err_stats.last_sess_failure_type = 1421 ISCSI_SESS_ERR_CXN_TIMEOUT; 1422 tiqn->sess_err_stats.cxn_timeout_errors++; 1423 atomic_long_inc(&sess->conn_timeout_errors); 1424 spin_unlock_bh(&tiqn->sess_err_stats.lock); 1425} 1426