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/percpu_ida.h> 21 #include <scsi/scsi_tcq.h> 22 #include <scsi/iscsi_proto.h> 23 #include <target/target_core_base.h> 24 #include <target/target_core_fabric.h> 25 #include <target/target_core_configfs.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_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, int state) 156 { 157 struct iscsi_cmd *cmd; 158 struct se_session *se_sess = conn->sess->se_sess; 159 int size, tag; 160 161 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state); 162 if (tag < 0) 163 return NULL; 164 165 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size; 166 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size)); 167 memset(cmd, 0, size); 168 169 cmd->se_cmd.map_tag = tag; 170 cmd->conn = conn; 171 INIT_LIST_HEAD(&cmd->i_conn_node); 172 INIT_LIST_HEAD(&cmd->datain_list); 173 INIT_LIST_HEAD(&cmd->cmd_r2t_list); 174 spin_lock_init(&cmd->datain_lock); 175 spin_lock_init(&cmd->dataout_timeout_lock); 176 spin_lock_init(&cmd->istate_lock); 177 spin_lock_init(&cmd->error_lock); 178 spin_lock_init(&cmd->r2t_lock); 179 180 return cmd; 181 } 182 EXPORT_SYMBOL(iscsit_allocate_cmd); 183 184 struct iscsi_seq *iscsit_get_seq_holder_for_datain( 185 struct iscsi_cmd *cmd, 186 u32 seq_send_order) 187 { 188 u32 i; 189 190 for (i = 0; i < cmd->seq_count; i++) 191 if (cmd->seq_list[i].seq_send_order == seq_send_order) 192 return &cmd->seq_list[i]; 193 194 return NULL; 195 } 196 197 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd) 198 { 199 u32 i; 200 201 if (!cmd->seq_list) { 202 pr_err("struct iscsi_cmd->seq_list is NULL!\n"); 203 return NULL; 204 } 205 206 for (i = 0; i < cmd->seq_count; i++) { 207 if (cmd->seq_list[i].type != SEQTYPE_NORMAL) 208 continue; 209 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) { 210 cmd->seq_send_order++; 211 return &cmd->seq_list[i]; 212 } 213 } 214 215 return NULL; 216 } 217 218 struct iscsi_r2t *iscsit_get_holder_for_r2tsn( 219 struct iscsi_cmd *cmd, 220 u32 r2t_sn) 221 { 222 struct iscsi_r2t *r2t; 223 224 spin_lock_bh(&cmd->r2t_lock); 225 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 226 if (r2t->r2t_sn == r2t_sn) { 227 spin_unlock_bh(&cmd->r2t_lock); 228 return r2t; 229 } 230 } 231 spin_unlock_bh(&cmd->r2t_lock); 232 233 return NULL; 234 } 235 236 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn) 237 { 238 int ret; 239 240 /* 241 * This is the proper method of checking received CmdSN against 242 * ExpCmdSN and MaxCmdSN values, as well as accounting for out 243 * or order CmdSNs due to multiple connection sessions and/or 244 * CRC failures. 245 */ 246 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) { 247 pr_err("Received CmdSN: 0x%08x is greater than" 248 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, 249 sess->max_cmd_sn); 250 ret = CMDSN_MAXCMDSN_OVERRUN; 251 252 } else if (cmdsn == sess->exp_cmd_sn) { 253 sess->exp_cmd_sn++; 254 pr_debug("Received CmdSN matches ExpCmdSN," 255 " incremented ExpCmdSN to: 0x%08x\n", 256 sess->exp_cmd_sn); 257 ret = CMDSN_NORMAL_OPERATION; 258 259 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) { 260 pr_debug("Received CmdSN: 0x%08x is greater" 261 " than ExpCmdSN: 0x%08x, not acknowledging.\n", 262 cmdsn, sess->exp_cmd_sn); 263 ret = CMDSN_HIGHER_THAN_EXP; 264 265 } else { 266 pr_err("Received CmdSN: 0x%08x is less than" 267 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn, 268 sess->exp_cmd_sn); 269 ret = CMDSN_LOWER_THAN_EXP; 270 } 271 272 return ret; 273 } 274 275 /* 276 * Commands may be received out of order if MC/S is in use. 277 * Ensure they are executed in CmdSN order. 278 */ 279 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 280 unsigned char *buf, __be32 cmdsn) 281 { 282 int ret, cmdsn_ret; 283 bool reject = false; 284 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES; 285 286 mutex_lock(&conn->sess->cmdsn_mutex); 287 288 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn)); 289 switch (cmdsn_ret) { 290 case CMDSN_NORMAL_OPERATION: 291 ret = iscsit_execute_cmd(cmd, 0); 292 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list)) 293 iscsit_execute_ooo_cmdsns(conn->sess); 294 else if (ret < 0) { 295 reject = true; 296 ret = CMDSN_ERROR_CANNOT_RECOVER; 297 } 298 break; 299 case CMDSN_HIGHER_THAN_EXP: 300 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn)); 301 if (ret < 0) { 302 reject = true; 303 ret = CMDSN_ERROR_CANNOT_RECOVER; 304 break; 305 } 306 ret = CMDSN_HIGHER_THAN_EXP; 307 break; 308 case CMDSN_LOWER_THAN_EXP: 309 case CMDSN_MAXCMDSN_OVERRUN: 310 default: 311 cmd->i_state = ISTATE_REMOVE; 312 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 313 /* 314 * Existing callers for iscsit_sequence_cmd() will silently 315 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this 316 * return for CMDSN_MAXCMDSN_OVERRUN as well.. 317 */ 318 ret = CMDSN_LOWER_THAN_EXP; 319 break; 320 } 321 mutex_unlock(&conn->sess->cmdsn_mutex); 322 323 if (reject) 324 iscsit_reject_cmd(cmd, reason, buf); 325 326 return ret; 327 } 328 EXPORT_SYMBOL(iscsit_sequence_cmd); 329 330 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf) 331 { 332 struct iscsi_conn *conn = cmd->conn; 333 struct se_cmd *se_cmd = &cmd->se_cmd; 334 struct iscsi_data *hdr = (struct iscsi_data *) buf; 335 u32 payload_length = ntoh24(hdr->dlength); 336 337 if (conn->sess->sess_ops->InitialR2T) { 338 pr_err("Received unexpected unsolicited data" 339 " while InitialR2T=Yes, protocol error.\n"); 340 transport_send_check_condition_and_sense(se_cmd, 341 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 342 return -1; 343 } 344 345 if ((cmd->first_burst_len + payload_length) > 346 conn->sess->sess_ops->FirstBurstLength) { 347 pr_err("Total %u bytes exceeds FirstBurstLength: %u" 348 " for this Unsolicited DataOut Burst.\n", 349 (cmd->first_burst_len + payload_length), 350 conn->sess->sess_ops->FirstBurstLength); 351 transport_send_check_condition_and_sense(se_cmd, 352 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 353 return -1; 354 } 355 356 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) 357 return 0; 358 359 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) && 360 ((cmd->first_burst_len + payload_length) != 361 conn->sess->sess_ops->FirstBurstLength)) { 362 pr_err("Unsolicited non-immediate data received %u" 363 " does not equal FirstBurstLength: %u, and does" 364 " not equal ExpXferLen %u.\n", 365 (cmd->first_burst_len + payload_length), 366 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length); 367 transport_send_check_condition_and_sense(se_cmd, 368 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 369 return -1; 370 } 371 return 0; 372 } 373 374 struct iscsi_cmd *iscsit_find_cmd_from_itt( 375 struct iscsi_conn *conn, 376 itt_t init_task_tag) 377 { 378 struct iscsi_cmd *cmd; 379 380 spin_lock_bh(&conn->cmd_lock); 381 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 382 if (cmd->init_task_tag == init_task_tag) { 383 spin_unlock_bh(&conn->cmd_lock); 384 return cmd; 385 } 386 } 387 spin_unlock_bh(&conn->cmd_lock); 388 389 pr_err("Unable to locate ITT: 0x%08x on CID: %hu", 390 init_task_tag, conn->cid); 391 return NULL; 392 } 393 EXPORT_SYMBOL(iscsit_find_cmd_from_itt); 394 395 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump( 396 struct iscsi_conn *conn, 397 itt_t init_task_tag, 398 u32 length) 399 { 400 struct iscsi_cmd *cmd; 401 402 spin_lock_bh(&conn->cmd_lock); 403 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 404 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) 405 continue; 406 if (cmd->init_task_tag == init_task_tag) { 407 spin_unlock_bh(&conn->cmd_lock); 408 return cmd; 409 } 410 } 411 spin_unlock_bh(&conn->cmd_lock); 412 413 pr_err("Unable to locate ITT: 0x%08x on CID: %hu," 414 " dumping payload\n", init_task_tag, conn->cid); 415 if (length) 416 iscsit_dump_data_payload(conn, length, 1); 417 418 return NULL; 419 } 420 421 struct iscsi_cmd *iscsit_find_cmd_from_ttt( 422 struct iscsi_conn *conn, 423 u32 targ_xfer_tag) 424 { 425 struct iscsi_cmd *cmd = NULL; 426 427 spin_lock_bh(&conn->cmd_lock); 428 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 429 if (cmd->targ_xfer_tag == targ_xfer_tag) { 430 spin_unlock_bh(&conn->cmd_lock); 431 return cmd; 432 } 433 } 434 spin_unlock_bh(&conn->cmd_lock); 435 436 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n", 437 targ_xfer_tag, conn->cid); 438 return NULL; 439 } 440 441 int iscsit_find_cmd_for_recovery( 442 struct iscsi_session *sess, 443 struct iscsi_cmd **cmd_ptr, 444 struct iscsi_conn_recovery **cr_ptr, 445 itt_t init_task_tag) 446 { 447 struct iscsi_cmd *cmd = NULL; 448 struct iscsi_conn_recovery *cr; 449 /* 450 * Scan through the inactive connection recovery list's command list. 451 * If init_task_tag matches the command is still alligent. 452 */ 453 spin_lock(&sess->cr_i_lock); 454 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { 455 spin_lock(&cr->conn_recovery_cmd_lock); 456 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 457 if (cmd->init_task_tag == init_task_tag) { 458 spin_unlock(&cr->conn_recovery_cmd_lock); 459 spin_unlock(&sess->cr_i_lock); 460 461 *cr_ptr = cr; 462 *cmd_ptr = cmd; 463 return -2; 464 } 465 } 466 spin_unlock(&cr->conn_recovery_cmd_lock); 467 } 468 spin_unlock(&sess->cr_i_lock); 469 /* 470 * Scan through the active connection recovery list's command list. 471 * If init_task_tag matches the command is ready to be reassigned. 472 */ 473 spin_lock(&sess->cr_a_lock); 474 list_for_each_entry(cr, &sess->cr_active_list, cr_list) { 475 spin_lock(&cr->conn_recovery_cmd_lock); 476 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 477 if (cmd->init_task_tag == init_task_tag) { 478 spin_unlock(&cr->conn_recovery_cmd_lock); 479 spin_unlock(&sess->cr_a_lock); 480 481 *cr_ptr = cr; 482 *cmd_ptr = cmd; 483 return 0; 484 } 485 } 486 spin_unlock(&cr->conn_recovery_cmd_lock); 487 } 488 spin_unlock(&sess->cr_a_lock); 489 490 return -1; 491 } 492 493 void iscsit_add_cmd_to_immediate_queue( 494 struct iscsi_cmd *cmd, 495 struct iscsi_conn *conn, 496 u8 state) 497 { 498 struct iscsi_queue_req *qr; 499 500 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 501 if (!qr) { 502 pr_err("Unable to allocate memory for" 503 " struct iscsi_queue_req\n"); 504 return; 505 } 506 INIT_LIST_HEAD(&qr->qr_list); 507 qr->cmd = cmd; 508 qr->state = state; 509 510 spin_lock_bh(&conn->immed_queue_lock); 511 list_add_tail(&qr->qr_list, &conn->immed_queue_list); 512 atomic_inc(&cmd->immed_queue_count); 513 atomic_set(&conn->check_immediate_queue, 1); 514 spin_unlock_bh(&conn->immed_queue_lock); 515 516 wake_up(&conn->queues_wq); 517 } 518 519 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn) 520 { 521 struct iscsi_queue_req *qr; 522 523 spin_lock_bh(&conn->immed_queue_lock); 524 if (list_empty(&conn->immed_queue_list)) { 525 spin_unlock_bh(&conn->immed_queue_lock); 526 return NULL; 527 } 528 qr = list_first_entry(&conn->immed_queue_list, 529 struct iscsi_queue_req, qr_list); 530 531 list_del(&qr->qr_list); 532 if (qr->cmd) 533 atomic_dec(&qr->cmd->immed_queue_count); 534 spin_unlock_bh(&conn->immed_queue_lock); 535 536 return qr; 537 } 538 539 static void iscsit_remove_cmd_from_immediate_queue( 540 struct iscsi_cmd *cmd, 541 struct iscsi_conn *conn) 542 { 543 struct iscsi_queue_req *qr, *qr_tmp; 544 545 spin_lock_bh(&conn->immed_queue_lock); 546 if (!atomic_read(&cmd->immed_queue_count)) { 547 spin_unlock_bh(&conn->immed_queue_lock); 548 return; 549 } 550 551 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 552 if (qr->cmd != cmd) 553 continue; 554 555 atomic_dec(&qr->cmd->immed_queue_count); 556 list_del(&qr->qr_list); 557 kmem_cache_free(lio_qr_cache, qr); 558 } 559 spin_unlock_bh(&conn->immed_queue_lock); 560 561 if (atomic_read(&cmd->immed_queue_count)) { 562 pr_err("ITT: 0x%08x immed_queue_count: %d\n", 563 cmd->init_task_tag, 564 atomic_read(&cmd->immed_queue_count)); 565 } 566 } 567 568 void iscsit_add_cmd_to_response_queue( 569 struct iscsi_cmd *cmd, 570 struct iscsi_conn *conn, 571 u8 state) 572 { 573 struct iscsi_queue_req *qr; 574 575 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 576 if (!qr) { 577 pr_err("Unable to allocate memory for" 578 " struct iscsi_queue_req\n"); 579 return; 580 } 581 INIT_LIST_HEAD(&qr->qr_list); 582 qr->cmd = cmd; 583 qr->state = state; 584 585 spin_lock_bh(&conn->response_queue_lock); 586 list_add_tail(&qr->qr_list, &conn->response_queue_list); 587 atomic_inc(&cmd->response_queue_count); 588 spin_unlock_bh(&conn->response_queue_lock); 589 590 wake_up(&conn->queues_wq); 591 } 592 593 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn) 594 { 595 struct iscsi_queue_req *qr; 596 597 spin_lock_bh(&conn->response_queue_lock); 598 if (list_empty(&conn->response_queue_list)) { 599 spin_unlock_bh(&conn->response_queue_lock); 600 return NULL; 601 } 602 603 qr = list_first_entry(&conn->response_queue_list, 604 struct iscsi_queue_req, qr_list); 605 606 list_del(&qr->qr_list); 607 if (qr->cmd) 608 atomic_dec(&qr->cmd->response_queue_count); 609 spin_unlock_bh(&conn->response_queue_lock); 610 611 return qr; 612 } 613 614 static void iscsit_remove_cmd_from_response_queue( 615 struct iscsi_cmd *cmd, 616 struct iscsi_conn *conn) 617 { 618 struct iscsi_queue_req *qr, *qr_tmp; 619 620 spin_lock_bh(&conn->response_queue_lock); 621 if (!atomic_read(&cmd->response_queue_count)) { 622 spin_unlock_bh(&conn->response_queue_lock); 623 return; 624 } 625 626 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 627 qr_list) { 628 if (qr->cmd != cmd) 629 continue; 630 631 atomic_dec(&qr->cmd->response_queue_count); 632 list_del(&qr->qr_list); 633 kmem_cache_free(lio_qr_cache, qr); 634 } 635 spin_unlock_bh(&conn->response_queue_lock); 636 637 if (atomic_read(&cmd->response_queue_count)) { 638 pr_err("ITT: 0x%08x response_queue_count: %d\n", 639 cmd->init_task_tag, 640 atomic_read(&cmd->response_queue_count)); 641 } 642 } 643 644 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn) 645 { 646 bool empty; 647 648 spin_lock_bh(&conn->immed_queue_lock); 649 empty = list_empty(&conn->immed_queue_list); 650 spin_unlock_bh(&conn->immed_queue_lock); 651 652 if (!empty) 653 return empty; 654 655 spin_lock_bh(&conn->response_queue_lock); 656 empty = list_empty(&conn->response_queue_list); 657 spin_unlock_bh(&conn->response_queue_lock); 658 659 return empty; 660 } 661 662 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn) 663 { 664 struct iscsi_queue_req *qr, *qr_tmp; 665 666 spin_lock_bh(&conn->immed_queue_lock); 667 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 668 list_del(&qr->qr_list); 669 if (qr->cmd) 670 atomic_dec(&qr->cmd->immed_queue_count); 671 672 kmem_cache_free(lio_qr_cache, qr); 673 } 674 spin_unlock_bh(&conn->immed_queue_lock); 675 676 spin_lock_bh(&conn->response_queue_lock); 677 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 678 qr_list) { 679 list_del(&qr->qr_list); 680 if (qr->cmd) 681 atomic_dec(&qr->cmd->response_queue_count); 682 683 kmem_cache_free(lio_qr_cache, qr); 684 } 685 spin_unlock_bh(&conn->response_queue_lock); 686 } 687 688 void iscsit_release_cmd(struct iscsi_cmd *cmd) 689 { 690 struct iscsi_session *sess; 691 struct se_cmd *se_cmd = &cmd->se_cmd; 692 693 if (cmd->conn) 694 sess = cmd->conn->sess; 695 else 696 sess = cmd->sess; 697 698 BUG_ON(!sess || !sess->se_sess); 699 700 kfree(cmd->buf_ptr); 701 kfree(cmd->pdu_list); 702 kfree(cmd->seq_list); 703 kfree(cmd->tmr_req); 704 kfree(cmd->iov_data); 705 kfree(cmd->text_in_ptr); 706 707 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag); 708 } 709 EXPORT_SYMBOL(iscsit_release_cmd); 710 711 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd, 712 bool check_queues) 713 { 714 struct iscsi_conn *conn = cmd->conn; 715 716 if (scsi_cmd) { 717 if (cmd->data_direction == DMA_TO_DEVICE) { 718 iscsit_stop_dataout_timer(cmd); 719 iscsit_free_r2ts_from_list(cmd); 720 } 721 if (cmd->data_direction == DMA_FROM_DEVICE) 722 iscsit_free_all_datain_reqs(cmd); 723 } 724 725 if (conn && check_queues) { 726 iscsit_remove_cmd_from_immediate_queue(cmd, conn); 727 iscsit_remove_cmd_from_response_queue(cmd, conn); 728 } 729 } 730 731 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) 732 { 733 struct se_cmd *se_cmd = NULL; 734 int rc; 735 /* 736 * Determine if a struct se_cmd is associated with 737 * this struct iscsi_cmd. 738 */ 739 switch (cmd->iscsi_opcode) { 740 case ISCSI_OP_SCSI_CMD: 741 se_cmd = &cmd->se_cmd; 742 __iscsit_free_cmd(cmd, true, shutdown); 743 /* 744 * Fallthrough 745 */ 746 case ISCSI_OP_SCSI_TMFUNC: 747 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown); 748 if (!rc && shutdown && se_cmd && se_cmd->se_sess) { 749 __iscsit_free_cmd(cmd, true, shutdown); 750 target_put_sess_cmd(se_cmd->se_sess, se_cmd); 751 } 752 break; 753 case ISCSI_OP_REJECT: 754 /* 755 * Handle special case for REJECT when iscsi_add_reject*() has 756 * overwritten the original iscsi_opcode assignment, and the 757 * associated cmd->se_cmd needs to be released. 758 */ 759 if (cmd->se_cmd.se_tfo != NULL) { 760 se_cmd = &cmd->se_cmd; 761 __iscsit_free_cmd(cmd, true, shutdown); 762 763 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown); 764 if (!rc && shutdown && se_cmd->se_sess) { 765 __iscsit_free_cmd(cmd, true, shutdown); 766 target_put_sess_cmd(se_cmd->se_sess, se_cmd); 767 } 768 break; 769 } 770 /* Fall-through */ 771 default: 772 __iscsit_free_cmd(cmd, false, shutdown); 773 iscsit_release_cmd(cmd); 774 break; 775 } 776 } 777 778 int iscsit_check_session_usage_count(struct iscsi_session *sess) 779 { 780 spin_lock_bh(&sess->session_usage_lock); 781 if (sess->session_usage_count != 0) { 782 sess->session_waiting_on_uc = 1; 783 spin_unlock_bh(&sess->session_usage_lock); 784 if (in_interrupt()) 785 return 2; 786 787 wait_for_completion(&sess->session_waiting_on_uc_comp); 788 return 1; 789 } 790 spin_unlock_bh(&sess->session_usage_lock); 791 792 return 0; 793 } 794 795 void iscsit_dec_session_usage_count(struct iscsi_session *sess) 796 { 797 spin_lock_bh(&sess->session_usage_lock); 798 sess->session_usage_count--; 799 800 if (!sess->session_usage_count && sess->session_waiting_on_uc) 801 complete(&sess->session_waiting_on_uc_comp); 802 803 spin_unlock_bh(&sess->session_usage_lock); 804 } 805 806 void iscsit_inc_session_usage_count(struct iscsi_session *sess) 807 { 808 spin_lock_bh(&sess->session_usage_lock); 809 sess->session_usage_count++; 810 spin_unlock_bh(&sess->session_usage_lock); 811 } 812 813 /* 814 * Setup conn->if_marker and conn->of_marker values based upon 815 * the initial marker-less interval. (see iSCSI v19 A.2) 816 */ 817 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn) 818 { 819 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0; 820 /* 821 * IFMarkInt and OFMarkInt are negotiated as 32-bit words. 822 */ 823 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4); 824 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4); 825 826 if (conn->conn_ops->OFMarker) { 827 /* 828 * Account for the first Login Command received not 829 * via iscsi_recv_msg(). 830 */ 831 conn->of_marker += ISCSI_HDR_LEN; 832 if (conn->of_marker <= OFMarkInt) { 833 conn->of_marker = (OFMarkInt - conn->of_marker); 834 } else { 835 login_ofmarker_count = (conn->of_marker / OFMarkInt); 836 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) + 837 (login_ofmarker_count * MARKER_SIZE); 838 conn->of_marker = (next_marker - conn->of_marker); 839 } 840 conn->of_marker_offset = 0; 841 pr_debug("Setting OFMarker value to %u based on Initial" 842 " Markerless Interval.\n", conn->of_marker); 843 } 844 845 if (conn->conn_ops->IFMarker) { 846 if (conn->if_marker <= IFMarkInt) { 847 conn->if_marker = (IFMarkInt - conn->if_marker); 848 } else { 849 login_ifmarker_count = (conn->if_marker / IFMarkInt); 850 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) + 851 (login_ifmarker_count * MARKER_SIZE); 852 conn->if_marker = (next_marker - conn->if_marker); 853 } 854 pr_debug("Setting IFMarker value to %u based on Initial" 855 " Markerless Interval.\n", conn->if_marker); 856 } 857 858 return 0; 859 } 860 861 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid) 862 { 863 struct iscsi_conn *conn; 864 865 spin_lock_bh(&sess->conn_lock); 866 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 867 if ((conn->cid == cid) && 868 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) { 869 iscsit_inc_conn_usage_count(conn); 870 spin_unlock_bh(&sess->conn_lock); 871 return conn; 872 } 873 } 874 spin_unlock_bh(&sess->conn_lock); 875 876 return NULL; 877 } 878 879 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid) 880 { 881 struct iscsi_conn *conn; 882 883 spin_lock_bh(&sess->conn_lock); 884 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 885 if (conn->cid == cid) { 886 iscsit_inc_conn_usage_count(conn); 887 spin_lock(&conn->state_lock); 888 atomic_set(&conn->connection_wait_rcfr, 1); 889 spin_unlock(&conn->state_lock); 890 spin_unlock_bh(&sess->conn_lock); 891 return conn; 892 } 893 } 894 spin_unlock_bh(&sess->conn_lock); 895 896 return NULL; 897 } 898 899 void iscsit_check_conn_usage_count(struct iscsi_conn *conn) 900 { 901 spin_lock_bh(&conn->conn_usage_lock); 902 if (conn->conn_usage_count != 0) { 903 conn->conn_waiting_on_uc = 1; 904 spin_unlock_bh(&conn->conn_usage_lock); 905 906 wait_for_completion(&conn->conn_waiting_on_uc_comp); 907 return; 908 } 909 spin_unlock_bh(&conn->conn_usage_lock); 910 } 911 912 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn) 913 { 914 spin_lock_bh(&conn->conn_usage_lock); 915 conn->conn_usage_count--; 916 917 if (!conn->conn_usage_count && conn->conn_waiting_on_uc) 918 complete(&conn->conn_waiting_on_uc_comp); 919 920 spin_unlock_bh(&conn->conn_usage_lock); 921 } 922 923 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn) 924 { 925 spin_lock_bh(&conn->conn_usage_lock); 926 conn->conn_usage_count++; 927 spin_unlock_bh(&conn->conn_usage_lock); 928 } 929 930 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response) 931 { 932 u8 state; 933 struct iscsi_cmd *cmd; 934 935 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING); 936 if (!cmd) 937 return -1; 938 939 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN; 940 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE : 941 ISTATE_SEND_NOPIN_NO_RESPONSE; 942 cmd->init_task_tag = RESERVED_ITT; 943 cmd->targ_xfer_tag = (want_response) ? 944 session_get_next_ttt(conn->sess) : 0xFFFFFFFF; 945 spin_lock_bh(&conn->cmd_lock); 946 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 947 spin_unlock_bh(&conn->cmd_lock); 948 949 if (want_response) 950 iscsit_start_nopin_response_timer(conn); 951 iscsit_add_cmd_to_immediate_queue(cmd, conn, state); 952 953 return 0; 954 } 955 956 static void iscsit_handle_nopin_response_timeout(unsigned long data) 957 { 958 struct iscsi_conn *conn = (struct iscsi_conn *) data; 959 960 iscsit_inc_conn_usage_count(conn); 961 962 spin_lock_bh(&conn->nopin_timer_lock); 963 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) { 964 spin_unlock_bh(&conn->nopin_timer_lock); 965 iscsit_dec_conn_usage_count(conn); 966 return; 967 } 968 969 pr_debug("Did not receive response to NOPIN on CID: %hu on" 970 " SID: %u, failing connection.\n", conn->cid, 971 conn->sess->sid); 972 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 973 spin_unlock_bh(&conn->nopin_timer_lock); 974 975 { 976 struct iscsi_portal_group *tpg = conn->sess->tpg; 977 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 978 979 if (tiqn) { 980 spin_lock_bh(&tiqn->sess_err_stats.lock); 981 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, 982 conn->sess->sess_ops->InitiatorName); 983 tiqn->sess_err_stats.last_sess_failure_type = 984 ISCSI_SESS_ERR_CXN_TIMEOUT; 985 tiqn->sess_err_stats.cxn_timeout_errors++; 986 atomic_long_inc(&conn->sess->conn_timeout_errors); 987 spin_unlock_bh(&tiqn->sess_err_stats.lock); 988 } 989 } 990 991 iscsit_cause_connection_reinstatement(conn, 0); 992 iscsit_dec_conn_usage_count(conn); 993 } 994 995 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn) 996 { 997 struct iscsi_session *sess = conn->sess; 998 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 999 1000 spin_lock_bh(&conn->nopin_timer_lock); 1001 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 1002 spin_unlock_bh(&conn->nopin_timer_lock); 1003 return; 1004 } 1005 1006 mod_timer(&conn->nopin_response_timer, 1007 (get_jiffies_64() + na->nopin_response_timeout * HZ)); 1008 spin_unlock_bh(&conn->nopin_timer_lock); 1009 } 1010 1011 /* 1012 * Called with conn->nopin_timer_lock held. 1013 */ 1014 void iscsit_start_nopin_response_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 spin_lock_bh(&conn->nopin_timer_lock); 1020 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) { 1021 spin_unlock_bh(&conn->nopin_timer_lock); 1022 return; 1023 } 1024 1025 init_timer(&conn->nopin_response_timer); 1026 conn->nopin_response_timer.expires = 1027 (get_jiffies_64() + na->nopin_response_timeout * HZ); 1028 conn->nopin_response_timer.data = (unsigned long)conn; 1029 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout; 1030 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; 1031 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; 1032 add_timer(&conn->nopin_response_timer); 1033 1034 pr_debug("Started NOPIN Response Timer on CID: %d to %u" 1035 " seconds\n", conn->cid, na->nopin_response_timeout); 1036 spin_unlock_bh(&conn->nopin_timer_lock); 1037 } 1038 1039 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn) 1040 { 1041 spin_lock_bh(&conn->nopin_timer_lock); 1042 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 1043 spin_unlock_bh(&conn->nopin_timer_lock); 1044 return; 1045 } 1046 conn->nopin_response_timer_flags |= ISCSI_TF_STOP; 1047 spin_unlock_bh(&conn->nopin_timer_lock); 1048 1049 del_timer_sync(&conn->nopin_response_timer); 1050 1051 spin_lock_bh(&conn->nopin_timer_lock); 1052 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 1053 spin_unlock_bh(&conn->nopin_timer_lock); 1054 } 1055 1056 static void iscsit_handle_nopin_timeout(unsigned long data) 1057 { 1058 struct iscsi_conn *conn = (struct iscsi_conn *) data; 1059 1060 iscsit_inc_conn_usage_count(conn); 1061 1062 spin_lock_bh(&conn->nopin_timer_lock); 1063 if (conn->nopin_timer_flags & ISCSI_TF_STOP) { 1064 spin_unlock_bh(&conn->nopin_timer_lock); 1065 iscsit_dec_conn_usage_count(conn); 1066 return; 1067 } 1068 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1069 spin_unlock_bh(&conn->nopin_timer_lock); 1070 1071 iscsit_add_nopin(conn, 1); 1072 iscsit_dec_conn_usage_count(conn); 1073 } 1074 1075 /* 1076 * Called with conn->nopin_timer_lock held. 1077 */ 1078 void __iscsit_start_nopin_timer(struct iscsi_conn *conn) 1079 { 1080 struct iscsi_session *sess = conn->sess; 1081 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1082 /* 1083 * NOPIN timeout is disabled. 1084 */ 1085 if (!na->nopin_timeout) 1086 return; 1087 1088 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) 1089 return; 1090 1091 init_timer(&conn->nopin_timer); 1092 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1093 conn->nopin_timer.data = (unsigned long)conn; 1094 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1095 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1096 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1097 add_timer(&conn->nopin_timer); 1098 1099 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1100 " interval\n", conn->cid, na->nopin_timeout); 1101 } 1102 1103 void iscsit_start_nopin_timer(struct iscsi_conn *conn) 1104 { 1105 struct iscsi_session *sess = conn->sess; 1106 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1107 /* 1108 * NOPIN timeout is disabled.. 1109 */ 1110 if (!na->nopin_timeout) 1111 return; 1112 1113 spin_lock_bh(&conn->nopin_timer_lock); 1114 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) { 1115 spin_unlock_bh(&conn->nopin_timer_lock); 1116 return; 1117 } 1118 1119 init_timer(&conn->nopin_timer); 1120 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1121 conn->nopin_timer.data = (unsigned long)conn; 1122 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1123 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1124 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1125 add_timer(&conn->nopin_timer); 1126 1127 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1128 " interval\n", conn->cid, na->nopin_timeout); 1129 spin_unlock_bh(&conn->nopin_timer_lock); 1130 } 1131 1132 void iscsit_stop_nopin_timer(struct iscsi_conn *conn) 1133 { 1134 spin_lock_bh(&conn->nopin_timer_lock); 1135 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) { 1136 spin_unlock_bh(&conn->nopin_timer_lock); 1137 return; 1138 } 1139 conn->nopin_timer_flags |= ISCSI_TF_STOP; 1140 spin_unlock_bh(&conn->nopin_timer_lock); 1141 1142 del_timer_sync(&conn->nopin_timer); 1143 1144 spin_lock_bh(&conn->nopin_timer_lock); 1145 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1146 spin_unlock_bh(&conn->nopin_timer_lock); 1147 } 1148 1149 int iscsit_send_tx_data( 1150 struct iscsi_cmd *cmd, 1151 struct iscsi_conn *conn, 1152 int use_misc) 1153 { 1154 int tx_sent, tx_size; 1155 u32 iov_count; 1156 struct kvec *iov; 1157 1158 send_data: 1159 tx_size = cmd->tx_size; 1160 1161 if (!use_misc) { 1162 iov = &cmd->iov_data[0]; 1163 iov_count = cmd->iov_data_count; 1164 } else { 1165 iov = &cmd->iov_misc[0]; 1166 iov_count = cmd->iov_misc_count; 1167 } 1168 1169 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size); 1170 if (tx_size != tx_sent) { 1171 if (tx_sent == -EAGAIN) { 1172 pr_err("tx_data() returned -EAGAIN\n"); 1173 goto send_data; 1174 } else 1175 return -1; 1176 } 1177 cmd->tx_size = 0; 1178 1179 return 0; 1180 } 1181 1182 int iscsit_fe_sendpage_sg( 1183 struct iscsi_cmd *cmd, 1184 struct iscsi_conn *conn) 1185 { 1186 struct scatterlist *sg = cmd->first_data_sg; 1187 struct kvec iov; 1188 u32 tx_hdr_size, data_len; 1189 u32 offset = cmd->first_data_sg_off; 1190 int tx_sent, iov_off; 1191 1192 send_hdr: 1193 tx_hdr_size = ISCSI_HDR_LEN; 1194 if (conn->conn_ops->HeaderDigest) 1195 tx_hdr_size += ISCSI_CRC_LEN; 1196 1197 iov.iov_base = cmd->pdu; 1198 iov.iov_len = tx_hdr_size; 1199 1200 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size); 1201 if (tx_hdr_size != tx_sent) { 1202 if (tx_sent == -EAGAIN) { 1203 pr_err("tx_data() returned -EAGAIN\n"); 1204 goto send_hdr; 1205 } 1206 return -1; 1207 } 1208 1209 data_len = cmd->tx_size - tx_hdr_size - cmd->padding; 1210 /* 1211 * Set iov_off used by padding and data digest tx_data() calls below 1212 * in order to determine proper offset into cmd->iov_data[] 1213 */ 1214 if (conn->conn_ops->DataDigest) { 1215 data_len -= ISCSI_CRC_LEN; 1216 if (cmd->padding) 1217 iov_off = (cmd->iov_data_count - 2); 1218 else 1219 iov_off = (cmd->iov_data_count - 1); 1220 } else { 1221 iov_off = (cmd->iov_data_count - 1); 1222 } 1223 /* 1224 * Perform sendpage() for each page in the scatterlist 1225 */ 1226 while (data_len) { 1227 u32 space = (sg->length - offset); 1228 u32 sub_len = min_t(u32, data_len, space); 1229 send_pg: 1230 tx_sent = conn->sock->ops->sendpage(conn->sock, 1231 sg_page(sg), sg->offset + offset, sub_len, 0); 1232 if (tx_sent != sub_len) { 1233 if (tx_sent == -EAGAIN) { 1234 pr_err("tcp_sendpage() returned" 1235 " -EAGAIN\n"); 1236 goto send_pg; 1237 } 1238 1239 pr_err("tcp_sendpage() failure: %d\n", 1240 tx_sent); 1241 return -1; 1242 } 1243 1244 data_len -= sub_len; 1245 offset = 0; 1246 sg = sg_next(sg); 1247 } 1248 1249 send_padding: 1250 if (cmd->padding) { 1251 struct kvec *iov_p = &cmd->iov_data[iov_off++]; 1252 1253 tx_sent = tx_data(conn, iov_p, 1, cmd->padding); 1254 if (cmd->padding != tx_sent) { 1255 if (tx_sent == -EAGAIN) { 1256 pr_err("tx_data() returned -EAGAIN\n"); 1257 goto send_padding; 1258 } 1259 return -1; 1260 } 1261 } 1262 1263 send_datacrc: 1264 if (conn->conn_ops->DataDigest) { 1265 struct kvec *iov_d = &cmd->iov_data[iov_off]; 1266 1267 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN); 1268 if (ISCSI_CRC_LEN != tx_sent) { 1269 if (tx_sent == -EAGAIN) { 1270 pr_err("tx_data() returned -EAGAIN\n"); 1271 goto send_datacrc; 1272 } 1273 return -1; 1274 } 1275 } 1276 1277 return 0; 1278 } 1279 1280 /* 1281 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU 1282 * back to the Initiator when an expection condition occurs with the 1283 * errors set in status_class and status_detail. 1284 * 1285 * Parameters: iSCSI Connection, Status Class, Status Detail. 1286 * Returns: 0 on success, -1 on error. 1287 */ 1288 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail) 1289 { 1290 struct iscsi_login_rsp *hdr; 1291 struct iscsi_login *login = conn->conn_login; 1292 1293 login->login_failed = 1; 1294 iscsit_collect_login_stats(conn, status_class, status_detail); 1295 1296 memset(&login->rsp[0], 0, ISCSI_HDR_LEN); 1297 1298 hdr = (struct iscsi_login_rsp *)&login->rsp[0]; 1299 hdr->opcode = ISCSI_OP_LOGIN_RSP; 1300 hdr->status_class = status_class; 1301 hdr->status_detail = status_detail; 1302 hdr->itt = conn->login_itt; 1303 1304 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0); 1305 } 1306 1307 void iscsit_print_session_params(struct iscsi_session *sess) 1308 { 1309 struct iscsi_conn *conn; 1310 1311 pr_debug("-----------------------------[Session Params for" 1312 " SID: %u]-----------------------------\n", sess->sid); 1313 spin_lock_bh(&sess->conn_lock); 1314 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 1315 iscsi_dump_conn_ops(conn->conn_ops); 1316 spin_unlock_bh(&sess->conn_lock); 1317 1318 iscsi_dump_sess_ops(sess->sess_ops); 1319 } 1320 1321 static int iscsit_do_rx_data( 1322 struct iscsi_conn *conn, 1323 struct iscsi_data_count *count) 1324 { 1325 int data = count->data_length, rx_loop = 0, total_rx = 0; 1326 struct msghdr msg; 1327 1328 if (!conn || !conn->sock || !conn->conn_ops) 1329 return -1; 1330 1331 memset(&msg, 0, sizeof(struct msghdr)); 1332 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, 1333 count->iov, count->iov_count, data); 1334 1335 while (total_rx < data) { 1336 rx_loop = sock_recvmsg(conn->sock, &msg, 1337 (data - total_rx), MSG_WAITALL); 1338 if (rx_loop <= 0) { 1339 pr_debug("rx_loop: %d total_rx: %d\n", 1340 rx_loop, total_rx); 1341 return rx_loop; 1342 } 1343 total_rx += rx_loop; 1344 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n", 1345 rx_loop, total_rx, data); 1346 } 1347 1348 return total_rx; 1349 } 1350 1351 static int iscsit_do_tx_data( 1352 struct iscsi_conn *conn, 1353 struct iscsi_data_count *count) 1354 { 1355 int ret, iov_len; 1356 struct kvec *iov_p; 1357 struct msghdr msg; 1358 1359 if (!conn || !conn->sock || !conn->conn_ops) 1360 return -1; 1361 1362 if (count->data_length <= 0) { 1363 pr_err("Data length is: %d\n", count->data_length); 1364 return -1; 1365 } 1366 1367 memset(&msg, 0, sizeof(struct msghdr)); 1368 1369 iov_p = count->iov; 1370 iov_len = count->iov_count; 1371 1372 ret = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len, 1373 count->data_length); 1374 if (ret != count->data_length) { 1375 pr_err("Unexpected ret: %d send data %d\n", 1376 ret, count->data_length); 1377 return -EPIPE; 1378 } 1379 pr_debug("ret: %d, sent data: %d\n", ret, count->data_length); 1380 1381 return ret; 1382 } 1383 1384 int rx_data( 1385 struct iscsi_conn *conn, 1386 struct kvec *iov, 1387 int iov_count, 1388 int data) 1389 { 1390 struct iscsi_data_count c; 1391 1392 if (!conn || !conn->sock || !conn->conn_ops) 1393 return -1; 1394 1395 memset(&c, 0, sizeof(struct iscsi_data_count)); 1396 c.iov = iov; 1397 c.iov_count = iov_count; 1398 c.data_length = data; 1399 c.type = ISCSI_RX_DATA; 1400 1401 return iscsit_do_rx_data(conn, &c); 1402 } 1403 1404 int tx_data( 1405 struct iscsi_conn *conn, 1406 struct kvec *iov, 1407 int iov_count, 1408 int data) 1409 { 1410 struct iscsi_data_count c; 1411 1412 if (!conn || !conn->sock || !conn->conn_ops) 1413 return -1; 1414 1415 memset(&c, 0, sizeof(struct iscsi_data_count)); 1416 c.iov = iov; 1417 c.iov_count = iov_count; 1418 c.data_length = data; 1419 c.type = ISCSI_TX_DATA; 1420 1421 return iscsit_do_tx_data(conn, &c); 1422 } 1423 1424 void iscsit_collect_login_stats( 1425 struct iscsi_conn *conn, 1426 u8 status_class, 1427 u8 status_detail) 1428 { 1429 struct iscsi_param *intrname = NULL; 1430 struct iscsi_tiqn *tiqn; 1431 struct iscsi_login_stats *ls; 1432 1433 tiqn = iscsit_snmp_get_tiqn(conn); 1434 if (!tiqn) 1435 return; 1436 1437 ls = &tiqn->login_stats; 1438 1439 spin_lock(&ls->lock); 1440 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) && 1441 ((get_jiffies_64() - ls->last_fail_time) < 10)) { 1442 /* We already have the failure info for this login */ 1443 spin_unlock(&ls->lock); 1444 return; 1445 } 1446 1447 if (status_class == ISCSI_STATUS_CLS_SUCCESS) 1448 ls->accepts++; 1449 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) { 1450 ls->redirects++; 1451 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT; 1452 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1453 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) { 1454 ls->authenticate_fails++; 1455 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE; 1456 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1457 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) { 1458 ls->authorize_fails++; 1459 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE; 1460 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1461 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) { 1462 ls->negotiate_fails++; 1463 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE; 1464 } else { 1465 ls->other_fails++; 1466 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER; 1467 } 1468 1469 /* Save initiator name, ip address and time, if it is a failed login */ 1470 if (status_class != ISCSI_STATUS_CLS_SUCCESS) { 1471 if (conn->param_list) 1472 intrname = iscsi_find_param_from_key(INITIATORNAME, 1473 conn->param_list); 1474 strlcpy(ls->last_intr_fail_name, 1475 (intrname ? intrname->value : "Unknown"), 1476 sizeof(ls->last_intr_fail_name)); 1477 1478 ls->last_intr_fail_ip_family = conn->login_family; 1479 1480 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE, 1481 "%s", conn->login_ip); 1482 ls->last_fail_time = get_jiffies_64(); 1483 } 1484 1485 spin_unlock(&ls->lock); 1486 } 1487 1488 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn) 1489 { 1490 struct iscsi_portal_group *tpg; 1491 1492 if (!conn || !conn->sess) 1493 return NULL; 1494 1495 tpg = conn->sess->tpg; 1496 if (!tpg) 1497 return NULL; 1498 1499 if (!tpg->tpg_tiqn) 1500 return NULL; 1501 1502 return tpg->tpg_tiqn; 1503 } 1504