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