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 28 #include "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_tq.h" 37 #include "iscsi_target_util.h" 38 #include "iscsi_target.h" 39 40 #define PRINT_BUFF(buff, len) \ 41 { \ 42 int zzz; \ 43 \ 44 pr_debug("%d:\n", __LINE__); \ 45 for (zzz = 0; zzz < len; zzz++) { \ 46 if (zzz % 16 == 0) { \ 47 if (zzz) \ 48 pr_debug("\n"); \ 49 pr_debug("%4i: ", zzz); \ 50 } \ 51 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \ 52 } \ 53 if ((len + 1) % 16) \ 54 pr_debug("\n"); \ 55 } 56 57 extern struct list_head g_tiqn_list; 58 extern spinlock_t tiqn_lock; 59 60 /* 61 * Called with cmd->r2t_lock held. 62 */ 63 int iscsit_add_r2t_to_list( 64 struct iscsi_cmd *cmd, 65 u32 offset, 66 u32 xfer_len, 67 int recovery, 68 u32 r2t_sn) 69 { 70 struct iscsi_r2t *r2t; 71 72 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC); 73 if (!r2t) { 74 pr_err("Unable to allocate memory for struct iscsi_r2t.\n"); 75 return -1; 76 } 77 INIT_LIST_HEAD(&r2t->r2t_list); 78 79 r2t->recovery_r2t = recovery; 80 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn; 81 r2t->offset = offset; 82 r2t->xfer_len = xfer_len; 83 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list); 84 spin_unlock_bh(&cmd->r2t_lock); 85 86 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); 87 88 spin_lock_bh(&cmd->r2t_lock); 89 return 0; 90 } 91 92 struct iscsi_r2t *iscsit_get_r2t_for_eos( 93 struct iscsi_cmd *cmd, 94 u32 offset, 95 u32 length) 96 { 97 struct iscsi_r2t *r2t; 98 99 spin_lock_bh(&cmd->r2t_lock); 100 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 101 if ((r2t->offset <= offset) && 102 (r2t->offset + r2t->xfer_len) >= (offset + length)) { 103 spin_unlock_bh(&cmd->r2t_lock); 104 return r2t; 105 } 106 } 107 spin_unlock_bh(&cmd->r2t_lock); 108 109 pr_err("Unable to locate R2T for Offset: %u, Length:" 110 " %u\n", offset, length); 111 return NULL; 112 } 113 114 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd) 115 { 116 struct iscsi_r2t *r2t; 117 118 spin_lock_bh(&cmd->r2t_lock); 119 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 120 if (!r2t->sent_r2t) { 121 spin_unlock_bh(&cmd->r2t_lock); 122 return r2t; 123 } 124 } 125 spin_unlock_bh(&cmd->r2t_lock); 126 127 pr_err("Unable to locate next R2T to send for ITT:" 128 " 0x%08x.\n", cmd->init_task_tag); 129 return NULL; 130 } 131 132 /* 133 * Called with cmd->r2t_lock held. 134 */ 135 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd) 136 { 137 list_del(&r2t->r2t_list); 138 kmem_cache_free(lio_r2t_cache, r2t); 139 } 140 141 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd) 142 { 143 struct iscsi_r2t *r2t, *r2t_tmp; 144 145 spin_lock_bh(&cmd->r2t_lock); 146 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) 147 iscsit_free_r2t(r2t, cmd); 148 spin_unlock_bh(&cmd->r2t_lock); 149 } 150 151 /* 152 * May be called from software interrupt (timer) context for allocating 153 * iSCSI NopINs. 154 */ 155 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask) 156 { 157 struct iscsi_cmd *cmd; 158 159 cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask); 160 if (!cmd) { 161 pr_err("Unable to allocate memory for struct iscsi_cmd.\n"); 162 return NULL; 163 } 164 165 cmd->conn = conn; 166 INIT_LIST_HEAD(&cmd->i_conn_node); 167 INIT_LIST_HEAD(&cmd->datain_list); 168 INIT_LIST_HEAD(&cmd->cmd_r2t_list); 169 init_completion(&cmd->reject_comp); 170 spin_lock_init(&cmd->datain_lock); 171 spin_lock_init(&cmd->dataout_timeout_lock); 172 spin_lock_init(&cmd->istate_lock); 173 spin_lock_init(&cmd->error_lock); 174 spin_lock_init(&cmd->r2t_lock); 175 176 return cmd; 177 } 178 179 struct iscsi_seq *iscsit_get_seq_holder_for_datain( 180 struct iscsi_cmd *cmd, 181 u32 seq_send_order) 182 { 183 u32 i; 184 185 for (i = 0; i < cmd->seq_count; i++) 186 if (cmd->seq_list[i].seq_send_order == seq_send_order) 187 return &cmd->seq_list[i]; 188 189 return NULL; 190 } 191 192 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd) 193 { 194 u32 i; 195 196 if (!cmd->seq_list) { 197 pr_err("struct iscsi_cmd->seq_list is NULL!\n"); 198 return NULL; 199 } 200 201 for (i = 0; i < cmd->seq_count; i++) { 202 if (cmd->seq_list[i].type != SEQTYPE_NORMAL) 203 continue; 204 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) { 205 cmd->seq_send_order++; 206 return &cmd->seq_list[i]; 207 } 208 } 209 210 return NULL; 211 } 212 213 struct iscsi_r2t *iscsit_get_holder_for_r2tsn( 214 struct iscsi_cmd *cmd, 215 u32 r2t_sn) 216 { 217 struct iscsi_r2t *r2t; 218 219 spin_lock_bh(&cmd->r2t_lock); 220 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 221 if (r2t->r2t_sn == r2t_sn) { 222 spin_unlock_bh(&cmd->r2t_lock); 223 return r2t; 224 } 225 } 226 spin_unlock_bh(&cmd->r2t_lock); 227 228 return NULL; 229 } 230 231 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn) 232 { 233 int ret; 234 235 /* 236 * This is the proper method of checking received CmdSN against 237 * ExpCmdSN and MaxCmdSN values, as well as accounting for out 238 * or order CmdSNs due to multiple connection sessions and/or 239 * CRC failures. 240 */ 241 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) { 242 pr_err("Received CmdSN: 0x%08x is greater than" 243 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn, 244 sess->max_cmd_sn); 245 ret = CMDSN_ERROR_CANNOT_RECOVER; 246 247 } else if (cmdsn == sess->exp_cmd_sn) { 248 sess->exp_cmd_sn++; 249 pr_debug("Received CmdSN matches ExpCmdSN," 250 " incremented ExpCmdSN to: 0x%08x\n", 251 sess->exp_cmd_sn); 252 ret = CMDSN_NORMAL_OPERATION; 253 254 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) { 255 pr_debug("Received CmdSN: 0x%08x is greater" 256 " than ExpCmdSN: 0x%08x, not acknowledging.\n", 257 cmdsn, sess->exp_cmd_sn); 258 ret = CMDSN_HIGHER_THAN_EXP; 259 260 } else { 261 pr_err("Received CmdSN: 0x%08x is less than" 262 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn, 263 sess->exp_cmd_sn); 264 ret = CMDSN_LOWER_THAN_EXP; 265 } 266 267 return ret; 268 } 269 270 /* 271 * Commands may be received out of order if MC/S is in use. 272 * Ensure they are executed in CmdSN order. 273 */ 274 int iscsit_sequence_cmd( 275 struct iscsi_conn *conn, 276 struct iscsi_cmd *cmd, 277 __be32 cmdsn) 278 { 279 int ret; 280 int cmdsn_ret; 281 282 mutex_lock(&conn->sess->cmdsn_mutex); 283 284 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn)); 285 switch (cmdsn_ret) { 286 case CMDSN_NORMAL_OPERATION: 287 ret = iscsit_execute_cmd(cmd, 0); 288 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list)) 289 iscsit_execute_ooo_cmdsns(conn->sess); 290 break; 291 case CMDSN_HIGHER_THAN_EXP: 292 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn)); 293 break; 294 case CMDSN_LOWER_THAN_EXP: 295 cmd->i_state = ISTATE_REMOVE; 296 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 297 ret = cmdsn_ret; 298 break; 299 default: 300 ret = cmdsn_ret; 301 break; 302 } 303 mutex_unlock(&conn->sess->cmdsn_mutex); 304 305 return ret; 306 } 307 308 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf) 309 { 310 struct iscsi_conn *conn = cmd->conn; 311 struct se_cmd *se_cmd = &cmd->se_cmd; 312 struct iscsi_data *hdr = (struct iscsi_data *) buf; 313 u32 payload_length = ntoh24(hdr->dlength); 314 315 if (conn->sess->sess_ops->InitialR2T) { 316 pr_err("Received unexpected unsolicited data" 317 " while InitialR2T=Yes, protocol error.\n"); 318 transport_send_check_condition_and_sense(se_cmd, 319 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 320 return -1; 321 } 322 323 if ((cmd->first_burst_len + payload_length) > 324 conn->sess->sess_ops->FirstBurstLength) { 325 pr_err("Total %u bytes exceeds FirstBurstLength: %u" 326 " for this Unsolicited DataOut Burst.\n", 327 (cmd->first_burst_len + payload_length), 328 conn->sess->sess_ops->FirstBurstLength); 329 transport_send_check_condition_and_sense(se_cmd, 330 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 331 return -1; 332 } 333 334 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) 335 return 0; 336 337 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) && 338 ((cmd->first_burst_len + payload_length) != 339 conn->sess->sess_ops->FirstBurstLength)) { 340 pr_err("Unsolicited non-immediate data received %u" 341 " does not equal FirstBurstLength: %u, and does" 342 " not equal ExpXferLen %u.\n", 343 (cmd->first_burst_len + payload_length), 344 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length); 345 transport_send_check_condition_and_sense(se_cmd, 346 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 347 return -1; 348 } 349 return 0; 350 } 351 352 struct iscsi_cmd *iscsit_find_cmd_from_itt( 353 struct iscsi_conn *conn, 354 itt_t init_task_tag) 355 { 356 struct iscsi_cmd *cmd; 357 358 spin_lock_bh(&conn->cmd_lock); 359 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 360 if (cmd->init_task_tag == init_task_tag) { 361 spin_unlock_bh(&conn->cmd_lock); 362 return cmd; 363 } 364 } 365 spin_unlock_bh(&conn->cmd_lock); 366 367 pr_err("Unable to locate ITT: 0x%08x on CID: %hu", 368 init_task_tag, conn->cid); 369 return NULL; 370 } 371 372 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump( 373 struct iscsi_conn *conn, 374 itt_t init_task_tag, 375 u32 length) 376 { 377 struct iscsi_cmd *cmd; 378 379 spin_lock_bh(&conn->cmd_lock); 380 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 381 if (cmd->init_task_tag == init_task_tag) { 382 spin_unlock_bh(&conn->cmd_lock); 383 return cmd; 384 } 385 } 386 spin_unlock_bh(&conn->cmd_lock); 387 388 pr_err("Unable to locate ITT: 0x%08x on CID: %hu," 389 " dumping payload\n", init_task_tag, conn->cid); 390 if (length) 391 iscsit_dump_data_payload(conn, length, 1); 392 393 return NULL; 394 } 395 396 struct iscsi_cmd *iscsit_find_cmd_from_ttt( 397 struct iscsi_conn *conn, 398 u32 targ_xfer_tag) 399 { 400 struct iscsi_cmd *cmd = NULL; 401 402 spin_lock_bh(&conn->cmd_lock); 403 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 404 if (cmd->targ_xfer_tag == targ_xfer_tag) { 405 spin_unlock_bh(&conn->cmd_lock); 406 return cmd; 407 } 408 } 409 spin_unlock_bh(&conn->cmd_lock); 410 411 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n", 412 targ_xfer_tag, conn->cid); 413 return NULL; 414 } 415 416 int iscsit_find_cmd_for_recovery( 417 struct iscsi_session *sess, 418 struct iscsi_cmd **cmd_ptr, 419 struct iscsi_conn_recovery **cr_ptr, 420 itt_t init_task_tag) 421 { 422 struct iscsi_cmd *cmd = NULL; 423 struct iscsi_conn_recovery *cr; 424 /* 425 * Scan through the inactive connection recovery list's command list. 426 * If init_task_tag matches the command is still alligent. 427 */ 428 spin_lock(&sess->cr_i_lock); 429 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { 430 spin_lock(&cr->conn_recovery_cmd_lock); 431 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 432 if (cmd->init_task_tag == init_task_tag) { 433 spin_unlock(&cr->conn_recovery_cmd_lock); 434 spin_unlock(&sess->cr_i_lock); 435 436 *cr_ptr = cr; 437 *cmd_ptr = cmd; 438 return -2; 439 } 440 } 441 spin_unlock(&cr->conn_recovery_cmd_lock); 442 } 443 spin_unlock(&sess->cr_i_lock); 444 /* 445 * Scan through the active connection recovery list's command list. 446 * If init_task_tag matches the command is ready to be reassigned. 447 */ 448 spin_lock(&sess->cr_a_lock); 449 list_for_each_entry(cr, &sess->cr_active_list, cr_list) { 450 spin_lock(&cr->conn_recovery_cmd_lock); 451 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 452 if (cmd->init_task_tag == init_task_tag) { 453 spin_unlock(&cr->conn_recovery_cmd_lock); 454 spin_unlock(&sess->cr_a_lock); 455 456 *cr_ptr = cr; 457 *cmd_ptr = cmd; 458 return 0; 459 } 460 } 461 spin_unlock(&cr->conn_recovery_cmd_lock); 462 } 463 spin_unlock(&sess->cr_a_lock); 464 465 return -1; 466 } 467 468 void iscsit_add_cmd_to_immediate_queue( 469 struct iscsi_cmd *cmd, 470 struct iscsi_conn *conn, 471 u8 state) 472 { 473 struct iscsi_queue_req *qr; 474 475 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 476 if (!qr) { 477 pr_err("Unable to allocate memory for" 478 " struct iscsi_queue_req\n"); 479 return; 480 } 481 INIT_LIST_HEAD(&qr->qr_list); 482 qr->cmd = cmd; 483 qr->state = state; 484 485 spin_lock_bh(&conn->immed_queue_lock); 486 list_add_tail(&qr->qr_list, &conn->immed_queue_list); 487 atomic_inc(&cmd->immed_queue_count); 488 atomic_set(&conn->check_immediate_queue, 1); 489 spin_unlock_bh(&conn->immed_queue_lock); 490 491 wake_up(&conn->queues_wq); 492 } 493 494 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn) 495 { 496 struct iscsi_queue_req *qr; 497 498 spin_lock_bh(&conn->immed_queue_lock); 499 if (list_empty(&conn->immed_queue_list)) { 500 spin_unlock_bh(&conn->immed_queue_lock); 501 return NULL; 502 } 503 list_for_each_entry(qr, &conn->immed_queue_list, qr_list) 504 break; 505 506 list_del(&qr->qr_list); 507 if (qr->cmd) 508 atomic_dec(&qr->cmd->immed_queue_count); 509 spin_unlock_bh(&conn->immed_queue_lock); 510 511 return qr; 512 } 513 514 static void iscsit_remove_cmd_from_immediate_queue( 515 struct iscsi_cmd *cmd, 516 struct iscsi_conn *conn) 517 { 518 struct iscsi_queue_req *qr, *qr_tmp; 519 520 spin_lock_bh(&conn->immed_queue_lock); 521 if (!atomic_read(&cmd->immed_queue_count)) { 522 spin_unlock_bh(&conn->immed_queue_lock); 523 return; 524 } 525 526 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 527 if (qr->cmd != cmd) 528 continue; 529 530 atomic_dec(&qr->cmd->immed_queue_count); 531 list_del(&qr->qr_list); 532 kmem_cache_free(lio_qr_cache, qr); 533 } 534 spin_unlock_bh(&conn->immed_queue_lock); 535 536 if (atomic_read(&cmd->immed_queue_count)) { 537 pr_err("ITT: 0x%08x immed_queue_count: %d\n", 538 cmd->init_task_tag, 539 atomic_read(&cmd->immed_queue_count)); 540 } 541 } 542 543 void iscsit_add_cmd_to_response_queue( 544 struct iscsi_cmd *cmd, 545 struct iscsi_conn *conn, 546 u8 state) 547 { 548 struct iscsi_queue_req *qr; 549 550 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 551 if (!qr) { 552 pr_err("Unable to allocate memory for" 553 " struct iscsi_queue_req\n"); 554 return; 555 } 556 INIT_LIST_HEAD(&qr->qr_list); 557 qr->cmd = cmd; 558 qr->state = state; 559 560 spin_lock_bh(&conn->response_queue_lock); 561 list_add_tail(&qr->qr_list, &conn->response_queue_list); 562 atomic_inc(&cmd->response_queue_count); 563 spin_unlock_bh(&conn->response_queue_lock); 564 565 wake_up(&conn->queues_wq); 566 } 567 568 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn) 569 { 570 struct iscsi_queue_req *qr; 571 572 spin_lock_bh(&conn->response_queue_lock); 573 if (list_empty(&conn->response_queue_list)) { 574 spin_unlock_bh(&conn->response_queue_lock); 575 return NULL; 576 } 577 578 list_for_each_entry(qr, &conn->response_queue_list, qr_list) 579 break; 580 581 list_del(&qr->qr_list); 582 if (qr->cmd) 583 atomic_dec(&qr->cmd->response_queue_count); 584 spin_unlock_bh(&conn->response_queue_lock); 585 586 return qr; 587 } 588 589 static void iscsit_remove_cmd_from_response_queue( 590 struct iscsi_cmd *cmd, 591 struct iscsi_conn *conn) 592 { 593 struct iscsi_queue_req *qr, *qr_tmp; 594 595 spin_lock_bh(&conn->response_queue_lock); 596 if (!atomic_read(&cmd->response_queue_count)) { 597 spin_unlock_bh(&conn->response_queue_lock); 598 return; 599 } 600 601 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 602 qr_list) { 603 if (qr->cmd != cmd) 604 continue; 605 606 atomic_dec(&qr->cmd->response_queue_count); 607 list_del(&qr->qr_list); 608 kmem_cache_free(lio_qr_cache, qr); 609 } 610 spin_unlock_bh(&conn->response_queue_lock); 611 612 if (atomic_read(&cmd->response_queue_count)) { 613 pr_err("ITT: 0x%08x response_queue_count: %d\n", 614 cmd->init_task_tag, 615 atomic_read(&cmd->response_queue_count)); 616 } 617 } 618 619 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn) 620 { 621 bool empty; 622 623 spin_lock_bh(&conn->immed_queue_lock); 624 empty = list_empty(&conn->immed_queue_list); 625 spin_unlock_bh(&conn->immed_queue_lock); 626 627 if (!empty) 628 return empty; 629 630 spin_lock_bh(&conn->response_queue_lock); 631 empty = list_empty(&conn->response_queue_list); 632 spin_unlock_bh(&conn->response_queue_lock); 633 634 return empty; 635 } 636 637 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn) 638 { 639 struct iscsi_queue_req *qr, *qr_tmp; 640 641 spin_lock_bh(&conn->immed_queue_lock); 642 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 643 list_del(&qr->qr_list); 644 if (qr->cmd) 645 atomic_dec(&qr->cmd->immed_queue_count); 646 647 kmem_cache_free(lio_qr_cache, qr); 648 } 649 spin_unlock_bh(&conn->immed_queue_lock); 650 651 spin_lock_bh(&conn->response_queue_lock); 652 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 653 qr_list) { 654 list_del(&qr->qr_list); 655 if (qr->cmd) 656 atomic_dec(&qr->cmd->response_queue_count); 657 658 kmem_cache_free(lio_qr_cache, qr); 659 } 660 spin_unlock_bh(&conn->response_queue_lock); 661 } 662 663 void iscsit_release_cmd(struct iscsi_cmd *cmd) 664 { 665 struct iscsi_conn *conn = cmd->conn; 666 667 iscsit_free_r2ts_from_list(cmd); 668 iscsit_free_all_datain_reqs(cmd); 669 670 kfree(cmd->buf_ptr); 671 kfree(cmd->pdu_list); 672 kfree(cmd->seq_list); 673 kfree(cmd->tmr_req); 674 kfree(cmd->iov_data); 675 676 if (conn) { 677 iscsit_remove_cmd_from_immediate_queue(cmd, conn); 678 iscsit_remove_cmd_from_response_queue(cmd, conn); 679 } 680 681 kmem_cache_free(lio_cmd_cache, cmd); 682 } 683 684 void iscsit_free_cmd(struct iscsi_cmd *cmd) 685 { 686 /* 687 * Determine if a struct se_cmd is assoicated with 688 * this struct iscsi_cmd. 689 */ 690 switch (cmd->iscsi_opcode) { 691 case ISCSI_OP_SCSI_CMD: 692 case ISCSI_OP_SCSI_TMFUNC: 693 transport_generic_free_cmd(&cmd->se_cmd, 1); 694 break; 695 case ISCSI_OP_REJECT: 696 /* 697 * Handle special case for REJECT when iscsi_add_reject*() has 698 * overwritten the original iscsi_opcode assignment, and the 699 * associated cmd->se_cmd needs to be released. 700 */ 701 if (cmd->se_cmd.se_tfo != NULL) { 702 transport_generic_free_cmd(&cmd->se_cmd, 1); 703 break; 704 } 705 /* Fall-through */ 706 default: 707 iscsit_release_cmd(cmd); 708 break; 709 } 710 } 711 712 int iscsit_check_session_usage_count(struct iscsi_session *sess) 713 { 714 spin_lock_bh(&sess->session_usage_lock); 715 if (sess->session_usage_count != 0) { 716 sess->session_waiting_on_uc = 1; 717 spin_unlock_bh(&sess->session_usage_lock); 718 if (in_interrupt()) 719 return 2; 720 721 wait_for_completion(&sess->session_waiting_on_uc_comp); 722 return 1; 723 } 724 spin_unlock_bh(&sess->session_usage_lock); 725 726 return 0; 727 } 728 729 void iscsit_dec_session_usage_count(struct iscsi_session *sess) 730 { 731 spin_lock_bh(&sess->session_usage_lock); 732 sess->session_usage_count--; 733 734 if (!sess->session_usage_count && sess->session_waiting_on_uc) 735 complete(&sess->session_waiting_on_uc_comp); 736 737 spin_unlock_bh(&sess->session_usage_lock); 738 } 739 740 void iscsit_inc_session_usage_count(struct iscsi_session *sess) 741 { 742 spin_lock_bh(&sess->session_usage_lock); 743 sess->session_usage_count++; 744 spin_unlock_bh(&sess->session_usage_lock); 745 } 746 747 /* 748 * Setup conn->if_marker and conn->of_marker values based upon 749 * the initial marker-less interval. (see iSCSI v19 A.2) 750 */ 751 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn) 752 { 753 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0; 754 /* 755 * IFMarkInt and OFMarkInt are negotiated as 32-bit words. 756 */ 757 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4); 758 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4); 759 760 if (conn->conn_ops->OFMarker) { 761 /* 762 * Account for the first Login Command received not 763 * via iscsi_recv_msg(). 764 */ 765 conn->of_marker += ISCSI_HDR_LEN; 766 if (conn->of_marker <= OFMarkInt) { 767 conn->of_marker = (OFMarkInt - conn->of_marker); 768 } else { 769 login_ofmarker_count = (conn->of_marker / OFMarkInt); 770 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) + 771 (login_ofmarker_count * MARKER_SIZE); 772 conn->of_marker = (next_marker - conn->of_marker); 773 } 774 conn->of_marker_offset = 0; 775 pr_debug("Setting OFMarker value to %u based on Initial" 776 " Markerless Interval.\n", conn->of_marker); 777 } 778 779 if (conn->conn_ops->IFMarker) { 780 if (conn->if_marker <= IFMarkInt) { 781 conn->if_marker = (IFMarkInt - conn->if_marker); 782 } else { 783 login_ifmarker_count = (conn->if_marker / IFMarkInt); 784 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) + 785 (login_ifmarker_count * MARKER_SIZE); 786 conn->if_marker = (next_marker - conn->if_marker); 787 } 788 pr_debug("Setting IFMarker value to %u based on Initial" 789 " Markerless Interval.\n", conn->if_marker); 790 } 791 792 return 0; 793 } 794 795 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid) 796 { 797 struct iscsi_conn *conn; 798 799 spin_lock_bh(&sess->conn_lock); 800 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 801 if ((conn->cid == cid) && 802 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) { 803 iscsit_inc_conn_usage_count(conn); 804 spin_unlock_bh(&sess->conn_lock); 805 return conn; 806 } 807 } 808 spin_unlock_bh(&sess->conn_lock); 809 810 return NULL; 811 } 812 813 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid) 814 { 815 struct iscsi_conn *conn; 816 817 spin_lock_bh(&sess->conn_lock); 818 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 819 if (conn->cid == cid) { 820 iscsit_inc_conn_usage_count(conn); 821 spin_lock(&conn->state_lock); 822 atomic_set(&conn->connection_wait_rcfr, 1); 823 spin_unlock(&conn->state_lock); 824 spin_unlock_bh(&sess->conn_lock); 825 return conn; 826 } 827 } 828 spin_unlock_bh(&sess->conn_lock); 829 830 return NULL; 831 } 832 833 void iscsit_check_conn_usage_count(struct iscsi_conn *conn) 834 { 835 spin_lock_bh(&conn->conn_usage_lock); 836 if (conn->conn_usage_count != 0) { 837 conn->conn_waiting_on_uc = 1; 838 spin_unlock_bh(&conn->conn_usage_lock); 839 840 wait_for_completion(&conn->conn_waiting_on_uc_comp); 841 return; 842 } 843 spin_unlock_bh(&conn->conn_usage_lock); 844 } 845 846 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn) 847 { 848 spin_lock_bh(&conn->conn_usage_lock); 849 conn->conn_usage_count--; 850 851 if (!conn->conn_usage_count && conn->conn_waiting_on_uc) 852 complete(&conn->conn_waiting_on_uc_comp); 853 854 spin_unlock_bh(&conn->conn_usage_lock); 855 } 856 857 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn) 858 { 859 spin_lock_bh(&conn->conn_usage_lock); 860 conn->conn_usage_count++; 861 spin_unlock_bh(&conn->conn_usage_lock); 862 } 863 864 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response) 865 { 866 u8 state; 867 struct iscsi_cmd *cmd; 868 869 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC); 870 if (!cmd) 871 return -1; 872 873 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN; 874 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE : 875 ISTATE_SEND_NOPIN_NO_RESPONSE; 876 cmd->init_task_tag = RESERVED_ITT; 877 spin_lock_bh(&conn->sess->ttt_lock); 878 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ : 879 0xFFFFFFFF; 880 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF)) 881 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 882 spin_unlock_bh(&conn->sess->ttt_lock); 883 884 spin_lock_bh(&conn->cmd_lock); 885 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 886 spin_unlock_bh(&conn->cmd_lock); 887 888 if (want_response) 889 iscsit_start_nopin_response_timer(conn); 890 iscsit_add_cmd_to_immediate_queue(cmd, conn, state); 891 892 return 0; 893 } 894 895 static void iscsit_handle_nopin_response_timeout(unsigned long data) 896 { 897 struct iscsi_conn *conn = (struct iscsi_conn *) data; 898 899 iscsit_inc_conn_usage_count(conn); 900 901 spin_lock_bh(&conn->nopin_timer_lock); 902 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) { 903 spin_unlock_bh(&conn->nopin_timer_lock); 904 iscsit_dec_conn_usage_count(conn); 905 return; 906 } 907 908 pr_debug("Did not receive response to NOPIN on CID: %hu on" 909 " SID: %u, failing connection.\n", conn->cid, 910 conn->sess->sid); 911 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 912 spin_unlock_bh(&conn->nopin_timer_lock); 913 914 { 915 struct iscsi_portal_group *tpg = conn->sess->tpg; 916 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 917 918 if (tiqn) { 919 spin_lock_bh(&tiqn->sess_err_stats.lock); 920 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, 921 conn->sess->sess_ops->InitiatorName); 922 tiqn->sess_err_stats.last_sess_failure_type = 923 ISCSI_SESS_ERR_CXN_TIMEOUT; 924 tiqn->sess_err_stats.cxn_timeout_errors++; 925 conn->sess->conn_timeout_errors++; 926 spin_unlock_bh(&tiqn->sess_err_stats.lock); 927 } 928 } 929 930 iscsit_cause_connection_reinstatement(conn, 0); 931 iscsit_dec_conn_usage_count(conn); 932 } 933 934 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn) 935 { 936 struct iscsi_session *sess = conn->sess; 937 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 938 939 spin_lock_bh(&conn->nopin_timer_lock); 940 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 941 spin_unlock_bh(&conn->nopin_timer_lock); 942 return; 943 } 944 945 mod_timer(&conn->nopin_response_timer, 946 (get_jiffies_64() + na->nopin_response_timeout * HZ)); 947 spin_unlock_bh(&conn->nopin_timer_lock); 948 } 949 950 /* 951 * Called with conn->nopin_timer_lock held. 952 */ 953 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn) 954 { 955 struct iscsi_session *sess = conn->sess; 956 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 957 958 spin_lock_bh(&conn->nopin_timer_lock); 959 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) { 960 spin_unlock_bh(&conn->nopin_timer_lock); 961 return; 962 } 963 964 init_timer(&conn->nopin_response_timer); 965 conn->nopin_response_timer.expires = 966 (get_jiffies_64() + na->nopin_response_timeout * HZ); 967 conn->nopin_response_timer.data = (unsigned long)conn; 968 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout; 969 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; 970 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; 971 add_timer(&conn->nopin_response_timer); 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 static void iscsit_handle_nopin_timeout(unsigned long data) 996 { 997 struct iscsi_conn *conn = (struct iscsi_conn *) data; 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 /* 1015 * Called with conn->nopin_timer_lock held. 1016 */ 1017 void __iscsit_start_nopin_timer(struct iscsi_conn *conn) 1018 { 1019 struct iscsi_session *sess = conn->sess; 1020 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 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 init_timer(&conn->nopin_timer); 1031 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1032 conn->nopin_timer.data = (unsigned long)conn; 1033 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1034 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1035 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1036 add_timer(&conn->nopin_timer); 1037 1038 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1039 " interval\n", conn->cid, na->nopin_timeout); 1040 } 1041 1042 void iscsit_start_nopin_timer(struct iscsi_conn *conn) 1043 { 1044 struct iscsi_session *sess = conn->sess; 1045 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1046 /* 1047 * NOPIN timeout is disabled.. 1048 */ 1049 if (!na->nopin_timeout) 1050 return; 1051 1052 spin_lock_bh(&conn->nopin_timer_lock); 1053 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) { 1054 spin_unlock_bh(&conn->nopin_timer_lock); 1055 return; 1056 } 1057 1058 init_timer(&conn->nopin_timer); 1059 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1060 conn->nopin_timer.data = (unsigned long)conn; 1061 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1062 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1063 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1064 add_timer(&conn->nopin_timer); 1065 1066 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1067 " interval\n", conn->cid, na->nopin_timeout); 1068 spin_unlock_bh(&conn->nopin_timer_lock); 1069 } 1070 1071 void iscsit_stop_nopin_timer(struct iscsi_conn *conn) 1072 { 1073 spin_lock_bh(&conn->nopin_timer_lock); 1074 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) { 1075 spin_unlock_bh(&conn->nopin_timer_lock); 1076 return; 1077 } 1078 conn->nopin_timer_flags |= ISCSI_TF_STOP; 1079 spin_unlock_bh(&conn->nopin_timer_lock); 1080 1081 del_timer_sync(&conn->nopin_timer); 1082 1083 spin_lock_bh(&conn->nopin_timer_lock); 1084 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1085 spin_unlock_bh(&conn->nopin_timer_lock); 1086 } 1087 1088 int iscsit_send_tx_data( 1089 struct iscsi_cmd *cmd, 1090 struct iscsi_conn *conn, 1091 int use_misc) 1092 { 1093 int tx_sent, tx_size; 1094 u32 iov_count; 1095 struct kvec *iov; 1096 1097 send_data: 1098 tx_size = cmd->tx_size; 1099 1100 if (!use_misc) { 1101 iov = &cmd->iov_data[0]; 1102 iov_count = cmd->iov_data_count; 1103 } else { 1104 iov = &cmd->iov_misc[0]; 1105 iov_count = cmd->iov_misc_count; 1106 } 1107 1108 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size); 1109 if (tx_size != tx_sent) { 1110 if (tx_sent == -EAGAIN) { 1111 pr_err("tx_data() returned -EAGAIN\n"); 1112 goto send_data; 1113 } else 1114 return -1; 1115 } 1116 cmd->tx_size = 0; 1117 1118 return 0; 1119 } 1120 1121 int iscsit_fe_sendpage_sg( 1122 struct iscsi_cmd *cmd, 1123 struct iscsi_conn *conn) 1124 { 1125 struct scatterlist *sg = cmd->first_data_sg; 1126 struct kvec iov; 1127 u32 tx_hdr_size, data_len; 1128 u32 offset = cmd->first_data_sg_off; 1129 int tx_sent, iov_off; 1130 1131 send_hdr: 1132 tx_hdr_size = ISCSI_HDR_LEN; 1133 if (conn->conn_ops->HeaderDigest) 1134 tx_hdr_size += ISCSI_CRC_LEN; 1135 1136 iov.iov_base = cmd->pdu; 1137 iov.iov_len = tx_hdr_size; 1138 1139 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size); 1140 if (tx_hdr_size != tx_sent) { 1141 if (tx_sent == -EAGAIN) { 1142 pr_err("tx_data() returned -EAGAIN\n"); 1143 goto send_hdr; 1144 } 1145 return -1; 1146 } 1147 1148 data_len = cmd->tx_size - tx_hdr_size - cmd->padding; 1149 /* 1150 * Set iov_off used by padding and data digest tx_data() calls below 1151 * in order to determine proper offset into cmd->iov_data[] 1152 */ 1153 if (conn->conn_ops->DataDigest) { 1154 data_len -= ISCSI_CRC_LEN; 1155 if (cmd->padding) 1156 iov_off = (cmd->iov_data_count - 2); 1157 else 1158 iov_off = (cmd->iov_data_count - 1); 1159 } else { 1160 iov_off = (cmd->iov_data_count - 1); 1161 } 1162 /* 1163 * Perform sendpage() for each page in the scatterlist 1164 */ 1165 while (data_len) { 1166 u32 space = (sg->length - offset); 1167 u32 sub_len = min_t(u32, data_len, space); 1168 send_pg: 1169 tx_sent = conn->sock->ops->sendpage(conn->sock, 1170 sg_page(sg), sg->offset + offset, sub_len, 0); 1171 if (tx_sent != sub_len) { 1172 if (tx_sent == -EAGAIN) { 1173 pr_err("tcp_sendpage() returned" 1174 " -EAGAIN\n"); 1175 goto send_pg; 1176 } 1177 1178 pr_err("tcp_sendpage() failure: %d\n", 1179 tx_sent); 1180 return -1; 1181 } 1182 1183 data_len -= sub_len; 1184 offset = 0; 1185 sg = sg_next(sg); 1186 } 1187 1188 send_padding: 1189 if (cmd->padding) { 1190 struct kvec *iov_p = &cmd->iov_data[iov_off++]; 1191 1192 tx_sent = tx_data(conn, iov_p, 1, cmd->padding); 1193 if (cmd->padding != tx_sent) { 1194 if (tx_sent == -EAGAIN) { 1195 pr_err("tx_data() returned -EAGAIN\n"); 1196 goto send_padding; 1197 } 1198 return -1; 1199 } 1200 } 1201 1202 send_datacrc: 1203 if (conn->conn_ops->DataDigest) { 1204 struct kvec *iov_d = &cmd->iov_data[iov_off]; 1205 1206 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN); 1207 if (ISCSI_CRC_LEN != tx_sent) { 1208 if (tx_sent == -EAGAIN) { 1209 pr_err("tx_data() returned -EAGAIN\n"); 1210 goto send_datacrc; 1211 } 1212 return -1; 1213 } 1214 } 1215 1216 return 0; 1217 } 1218 1219 /* 1220 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU 1221 * back to the Initiator when an expection condition occurs with the 1222 * errors set in status_class and status_detail. 1223 * 1224 * Parameters: iSCSI Connection, Status Class, Status Detail. 1225 * Returns: 0 on success, -1 on error. 1226 */ 1227 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail) 1228 { 1229 u8 iscsi_hdr[ISCSI_HDR_LEN]; 1230 int err; 1231 struct kvec iov; 1232 struct iscsi_login_rsp *hdr; 1233 1234 iscsit_collect_login_stats(conn, status_class, status_detail); 1235 1236 memset(&iov, 0, sizeof(struct kvec)); 1237 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN); 1238 1239 hdr = (struct iscsi_login_rsp *)&iscsi_hdr; 1240 hdr->opcode = ISCSI_OP_LOGIN_RSP; 1241 hdr->status_class = status_class; 1242 hdr->status_detail = status_detail; 1243 hdr->itt = conn->login_itt; 1244 1245 iov.iov_base = &iscsi_hdr; 1246 iov.iov_len = ISCSI_HDR_LEN; 1247 1248 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN); 1249 1250 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN); 1251 if (err != ISCSI_HDR_LEN) { 1252 pr_err("tx_data returned less than expected\n"); 1253 return -1; 1254 } 1255 1256 return 0; 1257 } 1258 1259 void iscsit_print_session_params(struct iscsi_session *sess) 1260 { 1261 struct iscsi_conn *conn; 1262 1263 pr_debug("-----------------------------[Session Params for" 1264 " SID: %u]-----------------------------\n", sess->sid); 1265 spin_lock_bh(&sess->conn_lock); 1266 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 1267 iscsi_dump_conn_ops(conn->conn_ops); 1268 spin_unlock_bh(&sess->conn_lock); 1269 1270 iscsi_dump_sess_ops(sess->sess_ops); 1271 } 1272 1273 static int iscsit_do_rx_data( 1274 struct iscsi_conn *conn, 1275 struct iscsi_data_count *count) 1276 { 1277 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len; 1278 struct kvec *iov_p; 1279 struct msghdr msg; 1280 1281 if (!conn || !conn->sock || !conn->conn_ops) 1282 return -1; 1283 1284 memset(&msg, 0, sizeof(struct msghdr)); 1285 1286 iov_p = count->iov; 1287 iov_len = count->iov_count; 1288 1289 while (total_rx < data) { 1290 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len, 1291 (data - total_rx), MSG_WAITALL); 1292 if (rx_loop <= 0) { 1293 pr_debug("rx_loop: %d total_rx: %d\n", 1294 rx_loop, total_rx); 1295 return rx_loop; 1296 } 1297 total_rx += rx_loop; 1298 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n", 1299 rx_loop, total_rx, data); 1300 } 1301 1302 return total_rx; 1303 } 1304 1305 static int iscsit_do_tx_data( 1306 struct iscsi_conn *conn, 1307 struct iscsi_data_count *count) 1308 { 1309 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len; 1310 struct kvec *iov_p; 1311 struct msghdr msg; 1312 1313 if (!conn || !conn->sock || !conn->conn_ops) 1314 return -1; 1315 1316 if (data <= 0) { 1317 pr_err("Data length is: %d\n", data); 1318 return -1; 1319 } 1320 1321 memset(&msg, 0, sizeof(struct msghdr)); 1322 1323 iov_p = count->iov; 1324 iov_len = count->iov_count; 1325 1326 while (total_tx < data) { 1327 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len, 1328 (data - total_tx)); 1329 if (tx_loop <= 0) { 1330 pr_debug("tx_loop: %d total_tx %d\n", 1331 tx_loop, total_tx); 1332 return tx_loop; 1333 } 1334 total_tx += tx_loop; 1335 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n", 1336 tx_loop, total_tx, data); 1337 } 1338 1339 return total_tx; 1340 } 1341 1342 int rx_data( 1343 struct iscsi_conn *conn, 1344 struct kvec *iov, 1345 int iov_count, 1346 int data) 1347 { 1348 struct iscsi_data_count c; 1349 1350 if (!conn || !conn->sock || !conn->conn_ops) 1351 return -1; 1352 1353 memset(&c, 0, sizeof(struct iscsi_data_count)); 1354 c.iov = iov; 1355 c.iov_count = iov_count; 1356 c.data_length = data; 1357 c.type = ISCSI_RX_DATA; 1358 1359 return iscsit_do_rx_data(conn, &c); 1360 } 1361 1362 int tx_data( 1363 struct iscsi_conn *conn, 1364 struct kvec *iov, 1365 int iov_count, 1366 int data) 1367 { 1368 struct iscsi_data_count c; 1369 1370 if (!conn || !conn->sock || !conn->conn_ops) 1371 return -1; 1372 1373 memset(&c, 0, sizeof(struct iscsi_data_count)); 1374 c.iov = iov; 1375 c.iov_count = iov_count; 1376 c.data_length = data; 1377 c.type = ISCSI_TX_DATA; 1378 1379 return iscsit_do_tx_data(conn, &c); 1380 } 1381 1382 void iscsit_collect_login_stats( 1383 struct iscsi_conn *conn, 1384 u8 status_class, 1385 u8 status_detail) 1386 { 1387 struct iscsi_param *intrname = NULL; 1388 struct iscsi_tiqn *tiqn; 1389 struct iscsi_login_stats *ls; 1390 1391 tiqn = iscsit_snmp_get_tiqn(conn); 1392 if (!tiqn) 1393 return; 1394 1395 ls = &tiqn->login_stats; 1396 1397 spin_lock(&ls->lock); 1398 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) && 1399 ((get_jiffies_64() - ls->last_fail_time) < 10)) { 1400 /* We already have the failure info for this login */ 1401 spin_unlock(&ls->lock); 1402 return; 1403 } 1404 1405 if (status_class == ISCSI_STATUS_CLS_SUCCESS) 1406 ls->accepts++; 1407 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) { 1408 ls->redirects++; 1409 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT; 1410 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1411 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) { 1412 ls->authenticate_fails++; 1413 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE; 1414 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1415 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) { 1416 ls->authorize_fails++; 1417 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE; 1418 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1419 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) { 1420 ls->negotiate_fails++; 1421 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE; 1422 } else { 1423 ls->other_fails++; 1424 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER; 1425 } 1426 1427 /* Save initiator name, ip address and time, if it is a failed login */ 1428 if (status_class != ISCSI_STATUS_CLS_SUCCESS) { 1429 if (conn->param_list) 1430 intrname = iscsi_find_param_from_key(INITIATORNAME, 1431 conn->param_list); 1432 strcpy(ls->last_intr_fail_name, 1433 (intrname ? intrname->value : "Unknown")); 1434 1435 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family; 1436 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE, 1437 "%s", conn->login_ip); 1438 ls->last_fail_time = get_jiffies_64(); 1439 } 1440 1441 spin_unlock(&ls->lock); 1442 } 1443 1444 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn) 1445 { 1446 struct iscsi_portal_group *tpg; 1447 1448 if (!conn || !conn->sess) 1449 return NULL; 1450 1451 tpg = conn->sess->tpg; 1452 if (!tpg) 1453 return NULL; 1454 1455 if (!tpg->tpg_tiqn) 1456 return NULL; 1457 1458 return tpg->tpg_tiqn; 1459 } 1460