1 /******************************************************************************* 2 * This file contains the iSCSI Target specific utility functions. 3 * 4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. 5 * 6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2. 7 * 8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 ******************************************************************************/ 20 21 #include <linux/list.h> 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/target_core_configfs.h> 27 #include <target/iscsi/iscsi_transport.h> 28 29 #include "iscsi_target_core.h" 30 #include "iscsi_target_parameters.h" 31 #include "iscsi_target_seq_pdu_list.h" 32 #include "iscsi_target_datain_values.h" 33 #include "iscsi_target_erl0.h" 34 #include "iscsi_target_erl1.h" 35 #include "iscsi_target_erl2.h" 36 #include "iscsi_target_tpg.h" 37 #include "iscsi_target_tq.h" 38 #include "iscsi_target_util.h" 39 #include "iscsi_target.h" 40 41 #define PRINT_BUFF(buff, len) \ 42 { \ 43 int zzz; \ 44 \ 45 pr_debug("%d:\n", __LINE__); \ 46 for (zzz = 0; zzz < len; zzz++) { \ 47 if (zzz % 16 == 0) { \ 48 if (zzz) \ 49 pr_debug("\n"); \ 50 pr_debug("%4i: ", zzz); \ 51 } \ 52 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \ 53 } \ 54 if ((len + 1) % 16) \ 55 pr_debug("\n"); \ 56 } 57 58 extern struct list_head g_tiqn_list; 59 extern spinlock_t tiqn_lock; 60 61 /* 62 * Called with cmd->r2t_lock held. 63 */ 64 int iscsit_add_r2t_to_list( 65 struct iscsi_cmd *cmd, 66 u32 offset, 67 u32 xfer_len, 68 int recovery, 69 u32 r2t_sn) 70 { 71 struct iscsi_r2t *r2t; 72 73 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC); 74 if (!r2t) { 75 pr_err("Unable to allocate memory for struct iscsi_r2t.\n"); 76 return -1; 77 } 78 INIT_LIST_HEAD(&r2t->r2t_list); 79 80 r2t->recovery_r2t = recovery; 81 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn; 82 r2t->offset = offset; 83 r2t->xfer_len = xfer_len; 84 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list); 85 spin_unlock_bh(&cmd->r2t_lock); 86 87 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); 88 89 spin_lock_bh(&cmd->r2t_lock); 90 return 0; 91 } 92 93 struct iscsi_r2t *iscsit_get_r2t_for_eos( 94 struct iscsi_cmd *cmd, 95 u32 offset, 96 u32 length) 97 { 98 struct iscsi_r2t *r2t; 99 100 spin_lock_bh(&cmd->r2t_lock); 101 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 102 if ((r2t->offset <= offset) && 103 (r2t->offset + r2t->xfer_len) >= (offset + length)) { 104 spin_unlock_bh(&cmd->r2t_lock); 105 return r2t; 106 } 107 } 108 spin_unlock_bh(&cmd->r2t_lock); 109 110 pr_err("Unable to locate R2T for Offset: %u, Length:" 111 " %u\n", offset, length); 112 return NULL; 113 } 114 115 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd) 116 { 117 struct iscsi_r2t *r2t; 118 119 spin_lock_bh(&cmd->r2t_lock); 120 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 121 if (!r2t->sent_r2t) { 122 spin_unlock_bh(&cmd->r2t_lock); 123 return r2t; 124 } 125 } 126 spin_unlock_bh(&cmd->r2t_lock); 127 128 pr_err("Unable to locate next R2T to send for ITT:" 129 " 0x%08x.\n", cmd->init_task_tag); 130 return NULL; 131 } 132 133 /* 134 * Called with cmd->r2t_lock held. 135 */ 136 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd) 137 { 138 list_del(&r2t->r2t_list); 139 kmem_cache_free(lio_r2t_cache, r2t); 140 } 141 142 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd) 143 { 144 struct iscsi_r2t *r2t, *r2t_tmp; 145 146 spin_lock_bh(&cmd->r2t_lock); 147 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) 148 iscsit_free_r2t(r2t, cmd); 149 spin_unlock_bh(&cmd->r2t_lock); 150 } 151 152 struct iscsi_cmd *iscsit_alloc_cmd(struct iscsi_conn *conn, gfp_t gfp_mask) 153 { 154 struct iscsi_cmd *cmd; 155 156 cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask); 157 if (!cmd) 158 return NULL; 159 160 cmd->release_cmd = &iscsit_release_cmd; 161 return cmd; 162 } 163 164 /* 165 * May be called from software interrupt (timer) context for allocating 166 * iSCSI NopINs. 167 */ 168 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask) 169 { 170 struct iscsi_cmd *cmd; 171 172 cmd = conn->conn_transport->iscsit_alloc_cmd(conn, gfp_mask); 173 if (!cmd) { 174 pr_err("Unable to allocate memory for struct iscsi_cmd.\n"); 175 return NULL; 176 } 177 cmd->conn = conn; 178 INIT_LIST_HEAD(&cmd->i_conn_node); 179 INIT_LIST_HEAD(&cmd->datain_list); 180 INIT_LIST_HEAD(&cmd->cmd_r2t_list); 181 spin_lock_init(&cmd->datain_lock); 182 spin_lock_init(&cmd->dataout_timeout_lock); 183 spin_lock_init(&cmd->istate_lock); 184 spin_lock_init(&cmd->error_lock); 185 spin_lock_init(&cmd->r2t_lock); 186 187 return cmd; 188 } 189 EXPORT_SYMBOL(iscsit_allocate_cmd); 190 191 struct iscsi_seq *iscsit_get_seq_holder_for_datain( 192 struct iscsi_cmd *cmd, 193 u32 seq_send_order) 194 { 195 u32 i; 196 197 for (i = 0; i < cmd->seq_count; i++) 198 if (cmd->seq_list[i].seq_send_order == seq_send_order) 199 return &cmd->seq_list[i]; 200 201 return NULL; 202 } 203 204 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd) 205 { 206 u32 i; 207 208 if (!cmd->seq_list) { 209 pr_err("struct iscsi_cmd->seq_list is NULL!\n"); 210 return NULL; 211 } 212 213 for (i = 0; i < cmd->seq_count; i++) { 214 if (cmd->seq_list[i].type != SEQTYPE_NORMAL) 215 continue; 216 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) { 217 cmd->seq_send_order++; 218 return &cmd->seq_list[i]; 219 } 220 } 221 222 return NULL; 223 } 224 225 struct iscsi_r2t *iscsit_get_holder_for_r2tsn( 226 struct iscsi_cmd *cmd, 227 u32 r2t_sn) 228 { 229 struct iscsi_r2t *r2t; 230 231 spin_lock_bh(&cmd->r2t_lock); 232 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 233 if (r2t->r2t_sn == r2t_sn) { 234 spin_unlock_bh(&cmd->r2t_lock); 235 return r2t; 236 } 237 } 238 spin_unlock_bh(&cmd->r2t_lock); 239 240 return NULL; 241 } 242 243 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn) 244 { 245 int ret; 246 247 /* 248 * This is the proper method of checking received CmdSN against 249 * ExpCmdSN and MaxCmdSN values, as well as accounting for out 250 * or order CmdSNs due to multiple connection sessions and/or 251 * CRC failures. 252 */ 253 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) { 254 pr_err("Received CmdSN: 0x%08x is greater than" 255 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn, 256 sess->max_cmd_sn); 257 ret = CMDSN_ERROR_CANNOT_RECOVER; 258 259 } else if (cmdsn == sess->exp_cmd_sn) { 260 sess->exp_cmd_sn++; 261 pr_debug("Received CmdSN matches ExpCmdSN," 262 " incremented ExpCmdSN to: 0x%08x\n", 263 sess->exp_cmd_sn); 264 ret = CMDSN_NORMAL_OPERATION; 265 266 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) { 267 pr_debug("Received CmdSN: 0x%08x is greater" 268 " than ExpCmdSN: 0x%08x, not acknowledging.\n", 269 cmdsn, sess->exp_cmd_sn); 270 ret = CMDSN_HIGHER_THAN_EXP; 271 272 } else { 273 pr_err("Received CmdSN: 0x%08x is less than" 274 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn, 275 sess->exp_cmd_sn); 276 ret = CMDSN_LOWER_THAN_EXP; 277 } 278 279 return ret; 280 } 281 282 /* 283 * Commands may be received out of order if MC/S is in use. 284 * Ensure they are executed in CmdSN order. 285 */ 286 int iscsit_sequence_cmd( 287 struct iscsi_conn *conn, 288 struct iscsi_cmd *cmd, 289 __be32 cmdsn) 290 { 291 int ret; 292 int cmdsn_ret; 293 294 mutex_lock(&conn->sess->cmdsn_mutex); 295 296 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn)); 297 switch (cmdsn_ret) { 298 case CMDSN_NORMAL_OPERATION: 299 ret = iscsit_execute_cmd(cmd, 0); 300 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list)) 301 iscsit_execute_ooo_cmdsns(conn->sess); 302 break; 303 case CMDSN_HIGHER_THAN_EXP: 304 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn)); 305 break; 306 case CMDSN_LOWER_THAN_EXP: 307 cmd->i_state = ISTATE_REMOVE; 308 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 309 ret = cmdsn_ret; 310 break; 311 default: 312 ret = cmdsn_ret; 313 break; 314 } 315 mutex_unlock(&conn->sess->cmdsn_mutex); 316 317 return ret; 318 } 319 EXPORT_SYMBOL(iscsit_sequence_cmd); 320 321 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf) 322 { 323 struct iscsi_conn *conn = cmd->conn; 324 struct se_cmd *se_cmd = &cmd->se_cmd; 325 struct iscsi_data *hdr = (struct iscsi_data *) buf; 326 u32 payload_length = ntoh24(hdr->dlength); 327 328 if (conn->sess->sess_ops->InitialR2T) { 329 pr_err("Received unexpected unsolicited data" 330 " while InitialR2T=Yes, protocol error.\n"); 331 transport_send_check_condition_and_sense(se_cmd, 332 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 333 return -1; 334 } 335 336 if ((cmd->first_burst_len + payload_length) > 337 conn->sess->sess_ops->FirstBurstLength) { 338 pr_err("Total %u bytes exceeds FirstBurstLength: %u" 339 " for this Unsolicited DataOut Burst.\n", 340 (cmd->first_burst_len + payload_length), 341 conn->sess->sess_ops->FirstBurstLength); 342 transport_send_check_condition_and_sense(se_cmd, 343 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 344 return -1; 345 } 346 347 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) 348 return 0; 349 350 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) && 351 ((cmd->first_burst_len + payload_length) != 352 conn->sess->sess_ops->FirstBurstLength)) { 353 pr_err("Unsolicited non-immediate data received %u" 354 " does not equal FirstBurstLength: %u, and does" 355 " not equal ExpXferLen %u.\n", 356 (cmd->first_burst_len + payload_length), 357 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length); 358 transport_send_check_condition_and_sense(se_cmd, 359 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 360 return -1; 361 } 362 return 0; 363 } 364 365 struct iscsi_cmd *iscsit_find_cmd_from_itt( 366 struct iscsi_conn *conn, 367 itt_t init_task_tag) 368 { 369 struct iscsi_cmd *cmd; 370 371 spin_lock_bh(&conn->cmd_lock); 372 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 373 if (cmd->init_task_tag == init_task_tag) { 374 spin_unlock_bh(&conn->cmd_lock); 375 return cmd; 376 } 377 } 378 spin_unlock_bh(&conn->cmd_lock); 379 380 pr_err("Unable to locate ITT: 0x%08x on CID: %hu", 381 init_task_tag, conn->cid); 382 return NULL; 383 } 384 385 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump( 386 struct iscsi_conn *conn, 387 itt_t init_task_tag, 388 u32 length) 389 { 390 struct iscsi_cmd *cmd; 391 392 spin_lock_bh(&conn->cmd_lock); 393 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 394 if (cmd->init_task_tag == init_task_tag) { 395 spin_unlock_bh(&conn->cmd_lock); 396 return cmd; 397 } 398 } 399 spin_unlock_bh(&conn->cmd_lock); 400 401 pr_err("Unable to locate ITT: 0x%08x on CID: %hu," 402 " dumping payload\n", init_task_tag, conn->cid); 403 if (length) 404 iscsit_dump_data_payload(conn, length, 1); 405 406 return NULL; 407 } 408 409 struct iscsi_cmd *iscsit_find_cmd_from_ttt( 410 struct iscsi_conn *conn, 411 u32 targ_xfer_tag) 412 { 413 struct iscsi_cmd *cmd = NULL; 414 415 spin_lock_bh(&conn->cmd_lock); 416 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 417 if (cmd->targ_xfer_tag == targ_xfer_tag) { 418 spin_unlock_bh(&conn->cmd_lock); 419 return cmd; 420 } 421 } 422 spin_unlock_bh(&conn->cmd_lock); 423 424 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n", 425 targ_xfer_tag, conn->cid); 426 return NULL; 427 } 428 429 int iscsit_find_cmd_for_recovery( 430 struct iscsi_session *sess, 431 struct iscsi_cmd **cmd_ptr, 432 struct iscsi_conn_recovery **cr_ptr, 433 itt_t init_task_tag) 434 { 435 struct iscsi_cmd *cmd = NULL; 436 struct iscsi_conn_recovery *cr; 437 /* 438 * Scan through the inactive connection recovery list's command list. 439 * If init_task_tag matches the command is still alligent. 440 */ 441 spin_lock(&sess->cr_i_lock); 442 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { 443 spin_lock(&cr->conn_recovery_cmd_lock); 444 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 445 if (cmd->init_task_tag == init_task_tag) { 446 spin_unlock(&cr->conn_recovery_cmd_lock); 447 spin_unlock(&sess->cr_i_lock); 448 449 *cr_ptr = cr; 450 *cmd_ptr = cmd; 451 return -2; 452 } 453 } 454 spin_unlock(&cr->conn_recovery_cmd_lock); 455 } 456 spin_unlock(&sess->cr_i_lock); 457 /* 458 * Scan through the active connection recovery list's command list. 459 * If init_task_tag matches the command is ready to be reassigned. 460 */ 461 spin_lock(&sess->cr_a_lock); 462 list_for_each_entry(cr, &sess->cr_active_list, cr_list) { 463 spin_lock(&cr->conn_recovery_cmd_lock); 464 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 465 if (cmd->init_task_tag == init_task_tag) { 466 spin_unlock(&cr->conn_recovery_cmd_lock); 467 spin_unlock(&sess->cr_a_lock); 468 469 *cr_ptr = cr; 470 *cmd_ptr = cmd; 471 return 0; 472 } 473 } 474 spin_unlock(&cr->conn_recovery_cmd_lock); 475 } 476 spin_unlock(&sess->cr_a_lock); 477 478 return -1; 479 } 480 481 void iscsit_add_cmd_to_immediate_queue( 482 struct iscsi_cmd *cmd, 483 struct iscsi_conn *conn, 484 u8 state) 485 { 486 struct iscsi_queue_req *qr; 487 488 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 489 if (!qr) { 490 pr_err("Unable to allocate memory for" 491 " struct iscsi_queue_req\n"); 492 return; 493 } 494 INIT_LIST_HEAD(&qr->qr_list); 495 qr->cmd = cmd; 496 qr->state = state; 497 498 spin_lock_bh(&conn->immed_queue_lock); 499 list_add_tail(&qr->qr_list, &conn->immed_queue_list); 500 atomic_inc(&cmd->immed_queue_count); 501 atomic_set(&conn->check_immediate_queue, 1); 502 spin_unlock_bh(&conn->immed_queue_lock); 503 504 wake_up(&conn->queues_wq); 505 } 506 507 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn) 508 { 509 struct iscsi_queue_req *qr; 510 511 spin_lock_bh(&conn->immed_queue_lock); 512 if (list_empty(&conn->immed_queue_list)) { 513 spin_unlock_bh(&conn->immed_queue_lock); 514 return NULL; 515 } 516 qr = list_first_entry(&conn->immed_queue_list, 517 struct iscsi_queue_req, qr_list); 518 519 list_del(&qr->qr_list); 520 if (qr->cmd) 521 atomic_dec(&qr->cmd->immed_queue_count); 522 spin_unlock_bh(&conn->immed_queue_lock); 523 524 return qr; 525 } 526 527 static void iscsit_remove_cmd_from_immediate_queue( 528 struct iscsi_cmd *cmd, 529 struct iscsi_conn *conn) 530 { 531 struct iscsi_queue_req *qr, *qr_tmp; 532 533 spin_lock_bh(&conn->immed_queue_lock); 534 if (!atomic_read(&cmd->immed_queue_count)) { 535 spin_unlock_bh(&conn->immed_queue_lock); 536 return; 537 } 538 539 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 540 if (qr->cmd != cmd) 541 continue; 542 543 atomic_dec(&qr->cmd->immed_queue_count); 544 list_del(&qr->qr_list); 545 kmem_cache_free(lio_qr_cache, qr); 546 } 547 spin_unlock_bh(&conn->immed_queue_lock); 548 549 if (atomic_read(&cmd->immed_queue_count)) { 550 pr_err("ITT: 0x%08x immed_queue_count: %d\n", 551 cmd->init_task_tag, 552 atomic_read(&cmd->immed_queue_count)); 553 } 554 } 555 556 void iscsit_add_cmd_to_response_queue( 557 struct iscsi_cmd *cmd, 558 struct iscsi_conn *conn, 559 u8 state) 560 { 561 struct iscsi_queue_req *qr; 562 563 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 564 if (!qr) { 565 pr_err("Unable to allocate memory for" 566 " struct iscsi_queue_req\n"); 567 return; 568 } 569 INIT_LIST_HEAD(&qr->qr_list); 570 qr->cmd = cmd; 571 qr->state = state; 572 573 spin_lock_bh(&conn->response_queue_lock); 574 list_add_tail(&qr->qr_list, &conn->response_queue_list); 575 atomic_inc(&cmd->response_queue_count); 576 spin_unlock_bh(&conn->response_queue_lock); 577 578 wake_up(&conn->queues_wq); 579 } 580 581 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn) 582 { 583 struct iscsi_queue_req *qr; 584 585 spin_lock_bh(&conn->response_queue_lock); 586 if (list_empty(&conn->response_queue_list)) { 587 spin_unlock_bh(&conn->response_queue_lock); 588 return NULL; 589 } 590 591 qr = list_first_entry(&conn->response_queue_list, 592 struct iscsi_queue_req, qr_list); 593 594 list_del(&qr->qr_list); 595 if (qr->cmd) 596 atomic_dec(&qr->cmd->response_queue_count); 597 spin_unlock_bh(&conn->response_queue_lock); 598 599 return qr; 600 } 601 602 static void iscsit_remove_cmd_from_response_queue( 603 struct iscsi_cmd *cmd, 604 struct iscsi_conn *conn) 605 { 606 struct iscsi_queue_req *qr, *qr_tmp; 607 608 spin_lock_bh(&conn->response_queue_lock); 609 if (!atomic_read(&cmd->response_queue_count)) { 610 spin_unlock_bh(&conn->response_queue_lock); 611 return; 612 } 613 614 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 615 qr_list) { 616 if (qr->cmd != cmd) 617 continue; 618 619 atomic_dec(&qr->cmd->response_queue_count); 620 list_del(&qr->qr_list); 621 kmem_cache_free(lio_qr_cache, qr); 622 } 623 spin_unlock_bh(&conn->response_queue_lock); 624 625 if (atomic_read(&cmd->response_queue_count)) { 626 pr_err("ITT: 0x%08x response_queue_count: %d\n", 627 cmd->init_task_tag, 628 atomic_read(&cmd->response_queue_count)); 629 } 630 } 631 632 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn) 633 { 634 bool empty; 635 636 spin_lock_bh(&conn->immed_queue_lock); 637 empty = list_empty(&conn->immed_queue_list); 638 spin_unlock_bh(&conn->immed_queue_lock); 639 640 if (!empty) 641 return empty; 642 643 spin_lock_bh(&conn->response_queue_lock); 644 empty = list_empty(&conn->response_queue_list); 645 spin_unlock_bh(&conn->response_queue_lock); 646 647 return empty; 648 } 649 650 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn) 651 { 652 struct iscsi_queue_req *qr, *qr_tmp; 653 654 spin_lock_bh(&conn->immed_queue_lock); 655 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 656 list_del(&qr->qr_list); 657 if (qr->cmd) 658 atomic_dec(&qr->cmd->immed_queue_count); 659 660 kmem_cache_free(lio_qr_cache, qr); 661 } 662 spin_unlock_bh(&conn->immed_queue_lock); 663 664 spin_lock_bh(&conn->response_queue_lock); 665 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 666 qr_list) { 667 list_del(&qr->qr_list); 668 if (qr->cmd) 669 atomic_dec(&qr->cmd->response_queue_count); 670 671 kmem_cache_free(lio_qr_cache, qr); 672 } 673 spin_unlock_bh(&conn->response_queue_lock); 674 } 675 676 void iscsit_release_cmd(struct iscsi_cmd *cmd) 677 { 678 kfree(cmd->buf_ptr); 679 kfree(cmd->pdu_list); 680 kfree(cmd->seq_list); 681 kfree(cmd->tmr_req); 682 kfree(cmd->iov_data); 683 kfree(cmd->text_in_ptr); 684 685 kmem_cache_free(lio_cmd_cache, cmd); 686 } 687 688 static void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd, 689 bool check_queues) 690 { 691 struct iscsi_conn *conn = cmd->conn; 692 693 if (scsi_cmd) { 694 if (cmd->data_direction == DMA_TO_DEVICE) { 695 iscsit_stop_dataout_timer(cmd); 696 iscsit_free_r2ts_from_list(cmd); 697 } 698 if (cmd->data_direction == DMA_FROM_DEVICE) 699 iscsit_free_all_datain_reqs(cmd); 700 } 701 702 if (conn && check_queues) { 703 iscsit_remove_cmd_from_immediate_queue(cmd, conn); 704 iscsit_remove_cmd_from_response_queue(cmd, conn); 705 } 706 } 707 708 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) 709 { 710 struct se_cmd *se_cmd = NULL; 711 int rc; 712 /* 713 * Determine if a struct se_cmd is associated with 714 * this struct iscsi_cmd. 715 */ 716 switch (cmd->iscsi_opcode) { 717 case ISCSI_OP_SCSI_CMD: 718 se_cmd = &cmd->se_cmd; 719 __iscsit_free_cmd(cmd, true, shutdown); 720 /* 721 * Fallthrough 722 */ 723 case ISCSI_OP_SCSI_TMFUNC: 724 rc = transport_generic_free_cmd(&cmd->se_cmd, 1); 725 if (!rc && shutdown && se_cmd && se_cmd->se_sess) { 726 __iscsit_free_cmd(cmd, true, shutdown); 727 target_put_sess_cmd(se_cmd->se_sess, se_cmd); 728 } 729 break; 730 case ISCSI_OP_REJECT: 731 /* 732 * Handle special case for REJECT when iscsi_add_reject*() has 733 * overwritten the original iscsi_opcode assignment, and the 734 * associated cmd->se_cmd needs to be released. 735 */ 736 if (cmd->se_cmd.se_tfo != NULL) { 737 se_cmd = &cmd->se_cmd; 738 __iscsit_free_cmd(cmd, true, shutdown); 739 740 rc = transport_generic_free_cmd(&cmd->se_cmd, 1); 741 if (!rc && shutdown && se_cmd->se_sess) { 742 __iscsit_free_cmd(cmd, true, shutdown); 743 target_put_sess_cmd(se_cmd->se_sess, se_cmd); 744 } 745 break; 746 } 747 /* Fall-through */ 748 default: 749 __iscsit_free_cmd(cmd, false, shutdown); 750 cmd->release_cmd(cmd); 751 break; 752 } 753 } 754 755 int iscsit_check_session_usage_count(struct iscsi_session *sess) 756 { 757 spin_lock_bh(&sess->session_usage_lock); 758 if (sess->session_usage_count != 0) { 759 sess->session_waiting_on_uc = 1; 760 spin_unlock_bh(&sess->session_usage_lock); 761 if (in_interrupt()) 762 return 2; 763 764 wait_for_completion(&sess->session_waiting_on_uc_comp); 765 return 1; 766 } 767 spin_unlock_bh(&sess->session_usage_lock); 768 769 return 0; 770 } 771 772 void iscsit_dec_session_usage_count(struct iscsi_session *sess) 773 { 774 spin_lock_bh(&sess->session_usage_lock); 775 sess->session_usage_count--; 776 777 if (!sess->session_usage_count && sess->session_waiting_on_uc) 778 complete(&sess->session_waiting_on_uc_comp); 779 780 spin_unlock_bh(&sess->session_usage_lock); 781 } 782 783 void iscsit_inc_session_usage_count(struct iscsi_session *sess) 784 { 785 spin_lock_bh(&sess->session_usage_lock); 786 sess->session_usage_count++; 787 spin_unlock_bh(&sess->session_usage_lock); 788 } 789 790 /* 791 * Setup conn->if_marker and conn->of_marker values based upon 792 * the initial marker-less interval. (see iSCSI v19 A.2) 793 */ 794 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn) 795 { 796 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0; 797 /* 798 * IFMarkInt and OFMarkInt are negotiated as 32-bit words. 799 */ 800 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4); 801 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4); 802 803 if (conn->conn_ops->OFMarker) { 804 /* 805 * Account for the first Login Command received not 806 * via iscsi_recv_msg(). 807 */ 808 conn->of_marker += ISCSI_HDR_LEN; 809 if (conn->of_marker <= OFMarkInt) { 810 conn->of_marker = (OFMarkInt - conn->of_marker); 811 } else { 812 login_ofmarker_count = (conn->of_marker / OFMarkInt); 813 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) + 814 (login_ofmarker_count * MARKER_SIZE); 815 conn->of_marker = (next_marker - conn->of_marker); 816 } 817 conn->of_marker_offset = 0; 818 pr_debug("Setting OFMarker value to %u based on Initial" 819 " Markerless Interval.\n", conn->of_marker); 820 } 821 822 if (conn->conn_ops->IFMarker) { 823 if (conn->if_marker <= IFMarkInt) { 824 conn->if_marker = (IFMarkInt - conn->if_marker); 825 } else { 826 login_ifmarker_count = (conn->if_marker / IFMarkInt); 827 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) + 828 (login_ifmarker_count * MARKER_SIZE); 829 conn->if_marker = (next_marker - conn->if_marker); 830 } 831 pr_debug("Setting IFMarker value to %u based on Initial" 832 " Markerless Interval.\n", conn->if_marker); 833 } 834 835 return 0; 836 } 837 838 struct iscsi_conn *iscsit_get_conn_from_cid(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 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) { 846 iscsit_inc_conn_usage_count(conn); 847 spin_unlock_bh(&sess->conn_lock); 848 return conn; 849 } 850 } 851 spin_unlock_bh(&sess->conn_lock); 852 853 return NULL; 854 } 855 856 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid) 857 { 858 struct iscsi_conn *conn; 859 860 spin_lock_bh(&sess->conn_lock); 861 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 862 if (conn->cid == cid) { 863 iscsit_inc_conn_usage_count(conn); 864 spin_lock(&conn->state_lock); 865 atomic_set(&conn->connection_wait_rcfr, 1); 866 spin_unlock(&conn->state_lock); 867 spin_unlock_bh(&sess->conn_lock); 868 return conn; 869 } 870 } 871 spin_unlock_bh(&sess->conn_lock); 872 873 return NULL; 874 } 875 876 void iscsit_check_conn_usage_count(struct iscsi_conn *conn) 877 { 878 spin_lock_bh(&conn->conn_usage_lock); 879 if (conn->conn_usage_count != 0) { 880 conn->conn_waiting_on_uc = 1; 881 spin_unlock_bh(&conn->conn_usage_lock); 882 883 wait_for_completion(&conn->conn_waiting_on_uc_comp); 884 return; 885 } 886 spin_unlock_bh(&conn->conn_usage_lock); 887 } 888 889 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn) 890 { 891 spin_lock_bh(&conn->conn_usage_lock); 892 conn->conn_usage_count--; 893 894 if (!conn->conn_usage_count && conn->conn_waiting_on_uc) 895 complete(&conn->conn_waiting_on_uc_comp); 896 897 spin_unlock_bh(&conn->conn_usage_lock); 898 } 899 900 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn) 901 { 902 spin_lock_bh(&conn->conn_usage_lock); 903 conn->conn_usage_count++; 904 spin_unlock_bh(&conn->conn_usage_lock); 905 } 906 907 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response) 908 { 909 u8 state; 910 struct iscsi_cmd *cmd; 911 912 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC); 913 if (!cmd) 914 return -1; 915 916 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN; 917 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE : 918 ISTATE_SEND_NOPIN_NO_RESPONSE; 919 cmd->init_task_tag = RESERVED_ITT; 920 spin_lock_bh(&conn->sess->ttt_lock); 921 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ : 922 0xFFFFFFFF; 923 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF)) 924 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 925 spin_unlock_bh(&conn->sess->ttt_lock); 926 927 spin_lock_bh(&conn->cmd_lock); 928 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 929 spin_unlock_bh(&conn->cmd_lock); 930 931 if (want_response) 932 iscsit_start_nopin_response_timer(conn); 933 iscsit_add_cmd_to_immediate_queue(cmd, conn, state); 934 935 return 0; 936 } 937 938 static void iscsit_handle_nopin_response_timeout(unsigned long data) 939 { 940 struct iscsi_conn *conn = (struct iscsi_conn *) data; 941 942 iscsit_inc_conn_usage_count(conn); 943 944 spin_lock_bh(&conn->nopin_timer_lock); 945 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) { 946 spin_unlock_bh(&conn->nopin_timer_lock); 947 iscsit_dec_conn_usage_count(conn); 948 return; 949 } 950 951 pr_debug("Did not receive response to NOPIN on CID: %hu on" 952 " SID: %u, failing connection.\n", conn->cid, 953 conn->sess->sid); 954 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 955 spin_unlock_bh(&conn->nopin_timer_lock); 956 957 { 958 struct iscsi_portal_group *tpg = conn->sess->tpg; 959 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 960 961 if (tiqn) { 962 spin_lock_bh(&tiqn->sess_err_stats.lock); 963 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, 964 conn->sess->sess_ops->InitiatorName); 965 tiqn->sess_err_stats.last_sess_failure_type = 966 ISCSI_SESS_ERR_CXN_TIMEOUT; 967 tiqn->sess_err_stats.cxn_timeout_errors++; 968 conn->sess->conn_timeout_errors++; 969 spin_unlock_bh(&tiqn->sess_err_stats.lock); 970 } 971 } 972 973 iscsit_cause_connection_reinstatement(conn, 0); 974 iscsit_dec_conn_usage_count(conn); 975 } 976 977 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn) 978 { 979 struct iscsi_session *sess = conn->sess; 980 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 981 982 spin_lock_bh(&conn->nopin_timer_lock); 983 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 984 spin_unlock_bh(&conn->nopin_timer_lock); 985 return; 986 } 987 988 mod_timer(&conn->nopin_response_timer, 989 (get_jiffies_64() + na->nopin_response_timeout * HZ)); 990 spin_unlock_bh(&conn->nopin_timer_lock); 991 } 992 993 /* 994 * Called with conn->nopin_timer_lock held. 995 */ 996 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn) 997 { 998 struct iscsi_session *sess = conn->sess; 999 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1000 1001 spin_lock_bh(&conn->nopin_timer_lock); 1002 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) { 1003 spin_unlock_bh(&conn->nopin_timer_lock); 1004 return; 1005 } 1006 1007 init_timer(&conn->nopin_response_timer); 1008 conn->nopin_response_timer.expires = 1009 (get_jiffies_64() + na->nopin_response_timeout * HZ); 1010 conn->nopin_response_timer.data = (unsigned long)conn; 1011 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout; 1012 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; 1013 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; 1014 add_timer(&conn->nopin_response_timer); 1015 1016 pr_debug("Started NOPIN Response Timer on CID: %d to %u" 1017 " seconds\n", conn->cid, na->nopin_response_timeout); 1018 spin_unlock_bh(&conn->nopin_timer_lock); 1019 } 1020 1021 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn) 1022 { 1023 spin_lock_bh(&conn->nopin_timer_lock); 1024 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 1025 spin_unlock_bh(&conn->nopin_timer_lock); 1026 return; 1027 } 1028 conn->nopin_response_timer_flags |= ISCSI_TF_STOP; 1029 spin_unlock_bh(&conn->nopin_timer_lock); 1030 1031 del_timer_sync(&conn->nopin_response_timer); 1032 1033 spin_lock_bh(&conn->nopin_timer_lock); 1034 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 1035 spin_unlock_bh(&conn->nopin_timer_lock); 1036 } 1037 1038 static void iscsit_handle_nopin_timeout(unsigned long data) 1039 { 1040 struct iscsi_conn *conn = (struct iscsi_conn *) data; 1041 1042 iscsit_inc_conn_usage_count(conn); 1043 1044 spin_lock_bh(&conn->nopin_timer_lock); 1045 if (conn->nopin_timer_flags & ISCSI_TF_STOP) { 1046 spin_unlock_bh(&conn->nopin_timer_lock); 1047 iscsit_dec_conn_usage_count(conn); 1048 return; 1049 } 1050 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1051 spin_unlock_bh(&conn->nopin_timer_lock); 1052 1053 iscsit_add_nopin(conn, 1); 1054 iscsit_dec_conn_usage_count(conn); 1055 } 1056 1057 /* 1058 * Called with conn->nopin_timer_lock held. 1059 */ 1060 void __iscsit_start_nopin_timer(struct iscsi_conn *conn) 1061 { 1062 struct iscsi_session *sess = conn->sess; 1063 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1064 /* 1065 * NOPIN timeout is disabled. 1066 */ 1067 if (!na->nopin_timeout) 1068 return; 1069 1070 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) 1071 return; 1072 1073 init_timer(&conn->nopin_timer); 1074 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1075 conn->nopin_timer.data = (unsigned long)conn; 1076 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1077 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1078 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1079 add_timer(&conn->nopin_timer); 1080 1081 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1082 " interval\n", conn->cid, na->nopin_timeout); 1083 } 1084 1085 void iscsit_start_nopin_timer(struct iscsi_conn *conn) 1086 { 1087 struct iscsi_session *sess = conn->sess; 1088 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1089 /* 1090 * NOPIN timeout is disabled.. 1091 */ 1092 if (!na->nopin_timeout) 1093 return; 1094 1095 spin_lock_bh(&conn->nopin_timer_lock); 1096 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) { 1097 spin_unlock_bh(&conn->nopin_timer_lock); 1098 return; 1099 } 1100 1101 init_timer(&conn->nopin_timer); 1102 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1103 conn->nopin_timer.data = (unsigned long)conn; 1104 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1105 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1106 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1107 add_timer(&conn->nopin_timer); 1108 1109 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1110 " interval\n", conn->cid, na->nopin_timeout); 1111 spin_unlock_bh(&conn->nopin_timer_lock); 1112 } 1113 1114 void iscsit_stop_nopin_timer(struct iscsi_conn *conn) 1115 { 1116 spin_lock_bh(&conn->nopin_timer_lock); 1117 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) { 1118 spin_unlock_bh(&conn->nopin_timer_lock); 1119 return; 1120 } 1121 conn->nopin_timer_flags |= ISCSI_TF_STOP; 1122 spin_unlock_bh(&conn->nopin_timer_lock); 1123 1124 del_timer_sync(&conn->nopin_timer); 1125 1126 spin_lock_bh(&conn->nopin_timer_lock); 1127 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1128 spin_unlock_bh(&conn->nopin_timer_lock); 1129 } 1130 1131 int iscsit_send_tx_data( 1132 struct iscsi_cmd *cmd, 1133 struct iscsi_conn *conn, 1134 int use_misc) 1135 { 1136 int tx_sent, tx_size; 1137 u32 iov_count; 1138 struct kvec *iov; 1139 1140 send_data: 1141 tx_size = cmd->tx_size; 1142 1143 if (!use_misc) { 1144 iov = &cmd->iov_data[0]; 1145 iov_count = cmd->iov_data_count; 1146 } else { 1147 iov = &cmd->iov_misc[0]; 1148 iov_count = cmd->iov_misc_count; 1149 } 1150 1151 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size); 1152 if (tx_size != tx_sent) { 1153 if (tx_sent == -EAGAIN) { 1154 pr_err("tx_data() returned -EAGAIN\n"); 1155 goto send_data; 1156 } else 1157 return -1; 1158 } 1159 cmd->tx_size = 0; 1160 1161 return 0; 1162 } 1163 1164 int iscsit_fe_sendpage_sg( 1165 struct iscsi_cmd *cmd, 1166 struct iscsi_conn *conn) 1167 { 1168 struct scatterlist *sg = cmd->first_data_sg; 1169 struct kvec iov; 1170 u32 tx_hdr_size, data_len; 1171 u32 offset = cmd->first_data_sg_off; 1172 int tx_sent, iov_off; 1173 1174 send_hdr: 1175 tx_hdr_size = ISCSI_HDR_LEN; 1176 if (conn->conn_ops->HeaderDigest) 1177 tx_hdr_size += ISCSI_CRC_LEN; 1178 1179 iov.iov_base = cmd->pdu; 1180 iov.iov_len = tx_hdr_size; 1181 1182 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size); 1183 if (tx_hdr_size != tx_sent) { 1184 if (tx_sent == -EAGAIN) { 1185 pr_err("tx_data() returned -EAGAIN\n"); 1186 goto send_hdr; 1187 } 1188 return -1; 1189 } 1190 1191 data_len = cmd->tx_size - tx_hdr_size - cmd->padding; 1192 /* 1193 * Set iov_off used by padding and data digest tx_data() calls below 1194 * in order to determine proper offset into cmd->iov_data[] 1195 */ 1196 if (conn->conn_ops->DataDigest) { 1197 data_len -= ISCSI_CRC_LEN; 1198 if (cmd->padding) 1199 iov_off = (cmd->iov_data_count - 2); 1200 else 1201 iov_off = (cmd->iov_data_count - 1); 1202 } else { 1203 iov_off = (cmd->iov_data_count - 1); 1204 } 1205 /* 1206 * Perform sendpage() for each page in the scatterlist 1207 */ 1208 while (data_len) { 1209 u32 space = (sg->length - offset); 1210 u32 sub_len = min_t(u32, data_len, space); 1211 send_pg: 1212 tx_sent = conn->sock->ops->sendpage(conn->sock, 1213 sg_page(sg), sg->offset + offset, sub_len, 0); 1214 if (tx_sent != sub_len) { 1215 if (tx_sent == -EAGAIN) { 1216 pr_err("tcp_sendpage() returned" 1217 " -EAGAIN\n"); 1218 goto send_pg; 1219 } 1220 1221 pr_err("tcp_sendpage() failure: %d\n", 1222 tx_sent); 1223 return -1; 1224 } 1225 1226 data_len -= sub_len; 1227 offset = 0; 1228 sg = sg_next(sg); 1229 } 1230 1231 send_padding: 1232 if (cmd->padding) { 1233 struct kvec *iov_p = &cmd->iov_data[iov_off++]; 1234 1235 tx_sent = tx_data(conn, iov_p, 1, cmd->padding); 1236 if (cmd->padding != tx_sent) { 1237 if (tx_sent == -EAGAIN) { 1238 pr_err("tx_data() returned -EAGAIN\n"); 1239 goto send_padding; 1240 } 1241 return -1; 1242 } 1243 } 1244 1245 send_datacrc: 1246 if (conn->conn_ops->DataDigest) { 1247 struct kvec *iov_d = &cmd->iov_data[iov_off]; 1248 1249 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN); 1250 if (ISCSI_CRC_LEN != tx_sent) { 1251 if (tx_sent == -EAGAIN) { 1252 pr_err("tx_data() returned -EAGAIN\n"); 1253 goto send_datacrc; 1254 } 1255 return -1; 1256 } 1257 } 1258 1259 return 0; 1260 } 1261 1262 /* 1263 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU 1264 * back to the Initiator when an expection condition occurs with the 1265 * errors set in status_class and status_detail. 1266 * 1267 * Parameters: iSCSI Connection, Status Class, Status Detail. 1268 * Returns: 0 on success, -1 on error. 1269 */ 1270 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail) 1271 { 1272 struct iscsi_login_rsp *hdr; 1273 struct iscsi_login *login = conn->conn_login; 1274 1275 login->login_failed = 1; 1276 iscsit_collect_login_stats(conn, status_class, status_detail); 1277 1278 hdr = (struct iscsi_login_rsp *)&login->rsp[0]; 1279 hdr->opcode = ISCSI_OP_LOGIN_RSP; 1280 hdr->status_class = status_class; 1281 hdr->status_detail = status_detail; 1282 hdr->itt = conn->login_itt; 1283 1284 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0); 1285 } 1286 1287 void iscsit_print_session_params(struct iscsi_session *sess) 1288 { 1289 struct iscsi_conn *conn; 1290 1291 pr_debug("-----------------------------[Session Params for" 1292 " SID: %u]-----------------------------\n", sess->sid); 1293 spin_lock_bh(&sess->conn_lock); 1294 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 1295 iscsi_dump_conn_ops(conn->conn_ops); 1296 spin_unlock_bh(&sess->conn_lock); 1297 1298 iscsi_dump_sess_ops(sess->sess_ops); 1299 } 1300 1301 static int iscsit_do_rx_data( 1302 struct iscsi_conn *conn, 1303 struct iscsi_data_count *count) 1304 { 1305 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len; 1306 struct kvec *iov_p; 1307 struct msghdr msg; 1308 1309 if (!conn || !conn->sock || !conn->conn_ops) 1310 return -1; 1311 1312 memset(&msg, 0, sizeof(struct msghdr)); 1313 1314 iov_p = count->iov; 1315 iov_len = count->iov_count; 1316 1317 while (total_rx < data) { 1318 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len, 1319 (data - total_rx), MSG_WAITALL); 1320 if (rx_loop <= 0) { 1321 pr_debug("rx_loop: %d total_rx: %d\n", 1322 rx_loop, total_rx); 1323 return rx_loop; 1324 } 1325 total_rx += rx_loop; 1326 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n", 1327 rx_loop, total_rx, data); 1328 } 1329 1330 return total_rx; 1331 } 1332 1333 static int iscsit_do_tx_data( 1334 struct iscsi_conn *conn, 1335 struct iscsi_data_count *count) 1336 { 1337 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len; 1338 struct kvec *iov_p; 1339 struct msghdr msg; 1340 1341 if (!conn || !conn->sock || !conn->conn_ops) 1342 return -1; 1343 1344 if (data <= 0) { 1345 pr_err("Data length is: %d\n", data); 1346 return -1; 1347 } 1348 1349 memset(&msg, 0, sizeof(struct msghdr)); 1350 1351 iov_p = count->iov; 1352 iov_len = count->iov_count; 1353 1354 while (total_tx < data) { 1355 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len, 1356 (data - total_tx)); 1357 if (tx_loop <= 0) { 1358 pr_debug("tx_loop: %d total_tx %d\n", 1359 tx_loop, total_tx); 1360 return tx_loop; 1361 } 1362 total_tx += tx_loop; 1363 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n", 1364 tx_loop, total_tx, data); 1365 } 1366 1367 return total_tx; 1368 } 1369 1370 int rx_data( 1371 struct iscsi_conn *conn, 1372 struct kvec *iov, 1373 int iov_count, 1374 int data) 1375 { 1376 struct iscsi_data_count c; 1377 1378 if (!conn || !conn->sock || !conn->conn_ops) 1379 return -1; 1380 1381 memset(&c, 0, sizeof(struct iscsi_data_count)); 1382 c.iov = iov; 1383 c.iov_count = iov_count; 1384 c.data_length = data; 1385 c.type = ISCSI_RX_DATA; 1386 1387 return iscsit_do_rx_data(conn, &c); 1388 } 1389 1390 int tx_data( 1391 struct iscsi_conn *conn, 1392 struct kvec *iov, 1393 int iov_count, 1394 int data) 1395 { 1396 struct iscsi_data_count c; 1397 1398 if (!conn || !conn->sock || !conn->conn_ops) 1399 return -1; 1400 1401 memset(&c, 0, sizeof(struct iscsi_data_count)); 1402 c.iov = iov; 1403 c.iov_count = iov_count; 1404 c.data_length = data; 1405 c.type = ISCSI_TX_DATA; 1406 1407 return iscsit_do_tx_data(conn, &c); 1408 } 1409 1410 void iscsit_collect_login_stats( 1411 struct iscsi_conn *conn, 1412 u8 status_class, 1413 u8 status_detail) 1414 { 1415 struct iscsi_param *intrname = NULL; 1416 struct iscsi_tiqn *tiqn; 1417 struct iscsi_login_stats *ls; 1418 1419 tiqn = iscsit_snmp_get_tiqn(conn); 1420 if (!tiqn) 1421 return; 1422 1423 ls = &tiqn->login_stats; 1424 1425 spin_lock(&ls->lock); 1426 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) && 1427 ((get_jiffies_64() - ls->last_fail_time) < 10)) { 1428 /* We already have the failure info for this login */ 1429 spin_unlock(&ls->lock); 1430 return; 1431 } 1432 1433 if (status_class == ISCSI_STATUS_CLS_SUCCESS) 1434 ls->accepts++; 1435 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) { 1436 ls->redirects++; 1437 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT; 1438 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1439 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) { 1440 ls->authenticate_fails++; 1441 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE; 1442 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1443 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) { 1444 ls->authorize_fails++; 1445 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE; 1446 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1447 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) { 1448 ls->negotiate_fails++; 1449 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE; 1450 } else { 1451 ls->other_fails++; 1452 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER; 1453 } 1454 1455 /* Save initiator name, ip address and time, if it is a failed login */ 1456 if (status_class != ISCSI_STATUS_CLS_SUCCESS) { 1457 if (conn->param_list) 1458 intrname = iscsi_find_param_from_key(INITIATORNAME, 1459 conn->param_list); 1460 strcpy(ls->last_intr_fail_name, 1461 (intrname ? intrname->value : "Unknown")); 1462 1463 ls->last_intr_fail_ip_family = conn->login_family; 1464 1465 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE, 1466 "%s", conn->login_ip); 1467 ls->last_fail_time = get_jiffies_64(); 1468 } 1469 1470 spin_unlock(&ls->lock); 1471 } 1472 1473 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn) 1474 { 1475 struct iscsi_portal_group *tpg; 1476 1477 if (!conn || !conn->sess) 1478 return NULL; 1479 1480 tpg = conn->sess->tpg; 1481 if (!tpg) 1482 return NULL; 1483 1484 if (!tpg->tpg_tiqn) 1485 return NULL; 1486 1487 return tpg->tpg_tiqn; 1488 } 1489