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 "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 } 393 394 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump( 395 struct iscsi_conn *conn, 396 itt_t init_task_tag, 397 u32 length) 398 { 399 struct iscsi_cmd *cmd; 400 401 spin_lock_bh(&conn->cmd_lock); 402 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 403 if (cmd->init_task_tag == init_task_tag) { 404 spin_unlock_bh(&conn->cmd_lock); 405 return cmd; 406 } 407 } 408 spin_unlock_bh(&conn->cmd_lock); 409 410 pr_err("Unable to locate ITT: 0x%08x on CID: %hu," 411 " dumping payload\n", init_task_tag, conn->cid); 412 if (length) 413 iscsit_dump_data_payload(conn, length, 1); 414 415 return NULL; 416 } 417 418 struct iscsi_cmd *iscsit_find_cmd_from_ttt( 419 struct iscsi_conn *conn, 420 u32 targ_xfer_tag) 421 { 422 struct iscsi_cmd *cmd = NULL; 423 424 spin_lock_bh(&conn->cmd_lock); 425 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 426 if (cmd->targ_xfer_tag == targ_xfer_tag) { 427 spin_unlock_bh(&conn->cmd_lock); 428 return cmd; 429 } 430 } 431 spin_unlock_bh(&conn->cmd_lock); 432 433 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n", 434 targ_xfer_tag, conn->cid); 435 return NULL; 436 } 437 438 int iscsit_find_cmd_for_recovery( 439 struct iscsi_session *sess, 440 struct iscsi_cmd **cmd_ptr, 441 struct iscsi_conn_recovery **cr_ptr, 442 itt_t init_task_tag) 443 { 444 struct iscsi_cmd *cmd = NULL; 445 struct iscsi_conn_recovery *cr; 446 /* 447 * Scan through the inactive connection recovery list's command list. 448 * If init_task_tag matches the command is still alligent. 449 */ 450 spin_lock(&sess->cr_i_lock); 451 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { 452 spin_lock(&cr->conn_recovery_cmd_lock); 453 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 454 if (cmd->init_task_tag == init_task_tag) { 455 spin_unlock(&cr->conn_recovery_cmd_lock); 456 spin_unlock(&sess->cr_i_lock); 457 458 *cr_ptr = cr; 459 *cmd_ptr = cmd; 460 return -2; 461 } 462 } 463 spin_unlock(&cr->conn_recovery_cmd_lock); 464 } 465 spin_unlock(&sess->cr_i_lock); 466 /* 467 * Scan through the active connection recovery list's command list. 468 * If init_task_tag matches the command is ready to be reassigned. 469 */ 470 spin_lock(&sess->cr_a_lock); 471 list_for_each_entry(cr, &sess->cr_active_list, cr_list) { 472 spin_lock(&cr->conn_recovery_cmd_lock); 473 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 474 if (cmd->init_task_tag == init_task_tag) { 475 spin_unlock(&cr->conn_recovery_cmd_lock); 476 spin_unlock(&sess->cr_a_lock); 477 478 *cr_ptr = cr; 479 *cmd_ptr = cmd; 480 return 0; 481 } 482 } 483 spin_unlock(&cr->conn_recovery_cmd_lock); 484 } 485 spin_unlock(&sess->cr_a_lock); 486 487 return -1; 488 } 489 490 void iscsit_add_cmd_to_immediate_queue( 491 struct iscsi_cmd *cmd, 492 struct iscsi_conn *conn, 493 u8 state) 494 { 495 struct iscsi_queue_req *qr; 496 497 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 498 if (!qr) { 499 pr_err("Unable to allocate memory for" 500 " struct iscsi_queue_req\n"); 501 return; 502 } 503 INIT_LIST_HEAD(&qr->qr_list); 504 qr->cmd = cmd; 505 qr->state = state; 506 507 spin_lock_bh(&conn->immed_queue_lock); 508 list_add_tail(&qr->qr_list, &conn->immed_queue_list); 509 atomic_inc(&cmd->immed_queue_count); 510 atomic_set(&conn->check_immediate_queue, 1); 511 spin_unlock_bh(&conn->immed_queue_lock); 512 513 wake_up(&conn->queues_wq); 514 } 515 516 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn) 517 { 518 struct iscsi_queue_req *qr; 519 520 spin_lock_bh(&conn->immed_queue_lock); 521 if (list_empty(&conn->immed_queue_list)) { 522 spin_unlock_bh(&conn->immed_queue_lock); 523 return NULL; 524 } 525 qr = list_first_entry(&conn->immed_queue_list, 526 struct iscsi_queue_req, qr_list); 527 528 list_del(&qr->qr_list); 529 if (qr->cmd) 530 atomic_dec(&qr->cmd->immed_queue_count); 531 spin_unlock_bh(&conn->immed_queue_lock); 532 533 return qr; 534 } 535 536 static void iscsit_remove_cmd_from_immediate_queue( 537 struct iscsi_cmd *cmd, 538 struct iscsi_conn *conn) 539 { 540 struct iscsi_queue_req *qr, *qr_tmp; 541 542 spin_lock_bh(&conn->immed_queue_lock); 543 if (!atomic_read(&cmd->immed_queue_count)) { 544 spin_unlock_bh(&conn->immed_queue_lock); 545 return; 546 } 547 548 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 549 if (qr->cmd != cmd) 550 continue; 551 552 atomic_dec(&qr->cmd->immed_queue_count); 553 list_del(&qr->qr_list); 554 kmem_cache_free(lio_qr_cache, qr); 555 } 556 spin_unlock_bh(&conn->immed_queue_lock); 557 558 if (atomic_read(&cmd->immed_queue_count)) { 559 pr_err("ITT: 0x%08x immed_queue_count: %d\n", 560 cmd->init_task_tag, 561 atomic_read(&cmd->immed_queue_count)); 562 } 563 } 564 565 void iscsit_add_cmd_to_response_queue( 566 struct iscsi_cmd *cmd, 567 struct iscsi_conn *conn, 568 u8 state) 569 { 570 struct iscsi_queue_req *qr; 571 572 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 573 if (!qr) { 574 pr_err("Unable to allocate memory for" 575 " struct iscsi_queue_req\n"); 576 return; 577 } 578 INIT_LIST_HEAD(&qr->qr_list); 579 qr->cmd = cmd; 580 qr->state = state; 581 582 spin_lock_bh(&conn->response_queue_lock); 583 list_add_tail(&qr->qr_list, &conn->response_queue_list); 584 atomic_inc(&cmd->response_queue_count); 585 spin_unlock_bh(&conn->response_queue_lock); 586 587 wake_up(&conn->queues_wq); 588 } 589 590 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn) 591 { 592 struct iscsi_queue_req *qr; 593 594 spin_lock_bh(&conn->response_queue_lock); 595 if (list_empty(&conn->response_queue_list)) { 596 spin_unlock_bh(&conn->response_queue_lock); 597 return NULL; 598 } 599 600 qr = list_first_entry(&conn->response_queue_list, 601 struct iscsi_queue_req, qr_list); 602 603 list_del(&qr->qr_list); 604 if (qr->cmd) 605 atomic_dec(&qr->cmd->response_queue_count); 606 spin_unlock_bh(&conn->response_queue_lock); 607 608 return qr; 609 } 610 611 static void iscsit_remove_cmd_from_response_queue( 612 struct iscsi_cmd *cmd, 613 struct iscsi_conn *conn) 614 { 615 struct iscsi_queue_req *qr, *qr_tmp; 616 617 spin_lock_bh(&conn->response_queue_lock); 618 if (!atomic_read(&cmd->response_queue_count)) { 619 spin_unlock_bh(&conn->response_queue_lock); 620 return; 621 } 622 623 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 624 qr_list) { 625 if (qr->cmd != cmd) 626 continue; 627 628 atomic_dec(&qr->cmd->response_queue_count); 629 list_del(&qr->qr_list); 630 kmem_cache_free(lio_qr_cache, qr); 631 } 632 spin_unlock_bh(&conn->response_queue_lock); 633 634 if (atomic_read(&cmd->response_queue_count)) { 635 pr_err("ITT: 0x%08x response_queue_count: %d\n", 636 cmd->init_task_tag, 637 atomic_read(&cmd->response_queue_count)); 638 } 639 } 640 641 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn) 642 { 643 bool empty; 644 645 spin_lock_bh(&conn->immed_queue_lock); 646 empty = list_empty(&conn->immed_queue_list); 647 spin_unlock_bh(&conn->immed_queue_lock); 648 649 if (!empty) 650 return empty; 651 652 spin_lock_bh(&conn->response_queue_lock); 653 empty = list_empty(&conn->response_queue_list); 654 spin_unlock_bh(&conn->response_queue_lock); 655 656 return empty; 657 } 658 659 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn) 660 { 661 struct iscsi_queue_req *qr, *qr_tmp; 662 663 spin_lock_bh(&conn->immed_queue_lock); 664 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 665 list_del(&qr->qr_list); 666 if (qr->cmd) 667 atomic_dec(&qr->cmd->immed_queue_count); 668 669 kmem_cache_free(lio_qr_cache, qr); 670 } 671 spin_unlock_bh(&conn->immed_queue_lock); 672 673 spin_lock_bh(&conn->response_queue_lock); 674 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 675 qr_list) { 676 list_del(&qr->qr_list); 677 if (qr->cmd) 678 atomic_dec(&qr->cmd->response_queue_count); 679 680 kmem_cache_free(lio_qr_cache, qr); 681 } 682 spin_unlock_bh(&conn->response_queue_lock); 683 } 684 685 void iscsit_release_cmd(struct iscsi_cmd *cmd) 686 { 687 struct iscsi_session *sess; 688 struct se_cmd *se_cmd = &cmd->se_cmd; 689 690 if (cmd->conn) 691 sess = cmd->conn->sess; 692 else 693 sess = cmd->sess; 694 695 BUG_ON(!sess || !sess->se_sess); 696 697 kfree(cmd->buf_ptr); 698 kfree(cmd->pdu_list); 699 kfree(cmd->seq_list); 700 kfree(cmd->tmr_req); 701 kfree(cmd->iov_data); 702 kfree(cmd->text_in_ptr); 703 704 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag); 705 } 706 EXPORT_SYMBOL(iscsit_release_cmd); 707 708 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd, 709 bool check_queues) 710 { 711 struct iscsi_conn *conn = cmd->conn; 712 713 if (scsi_cmd) { 714 if (cmd->data_direction == DMA_TO_DEVICE) { 715 iscsit_stop_dataout_timer(cmd); 716 iscsit_free_r2ts_from_list(cmd); 717 } 718 if (cmd->data_direction == DMA_FROM_DEVICE) 719 iscsit_free_all_datain_reqs(cmd); 720 } 721 722 if (conn && check_queues) { 723 iscsit_remove_cmd_from_immediate_queue(cmd, conn); 724 iscsit_remove_cmd_from_response_queue(cmd, conn); 725 } 726 } 727 728 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) 729 { 730 struct se_cmd *se_cmd = NULL; 731 int rc; 732 /* 733 * Determine if a struct se_cmd is associated with 734 * this struct iscsi_cmd. 735 */ 736 switch (cmd->iscsi_opcode) { 737 case ISCSI_OP_SCSI_CMD: 738 se_cmd = &cmd->se_cmd; 739 __iscsit_free_cmd(cmd, true, shutdown); 740 /* 741 * Fallthrough 742 */ 743 case ISCSI_OP_SCSI_TMFUNC: 744 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown); 745 if (!rc && shutdown && se_cmd && se_cmd->se_sess) { 746 __iscsit_free_cmd(cmd, true, shutdown); 747 target_put_sess_cmd(se_cmd->se_sess, se_cmd); 748 } 749 break; 750 case ISCSI_OP_REJECT: 751 /* 752 * Handle special case for REJECT when iscsi_add_reject*() has 753 * overwritten the original iscsi_opcode assignment, and the 754 * associated cmd->se_cmd needs to be released. 755 */ 756 if (cmd->se_cmd.se_tfo != NULL) { 757 se_cmd = &cmd->se_cmd; 758 __iscsit_free_cmd(cmd, true, shutdown); 759 760 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown); 761 if (!rc && shutdown && se_cmd->se_sess) { 762 __iscsit_free_cmd(cmd, true, shutdown); 763 target_put_sess_cmd(se_cmd->se_sess, se_cmd); 764 } 765 break; 766 } 767 /* Fall-through */ 768 default: 769 __iscsit_free_cmd(cmd, false, shutdown); 770 iscsit_release_cmd(cmd); 771 break; 772 } 773 } 774 775 int iscsit_check_session_usage_count(struct iscsi_session *sess) 776 { 777 spin_lock_bh(&sess->session_usage_lock); 778 if (sess->session_usage_count != 0) { 779 sess->session_waiting_on_uc = 1; 780 spin_unlock_bh(&sess->session_usage_lock); 781 if (in_interrupt()) 782 return 2; 783 784 wait_for_completion(&sess->session_waiting_on_uc_comp); 785 return 1; 786 } 787 spin_unlock_bh(&sess->session_usage_lock); 788 789 return 0; 790 } 791 792 void iscsit_dec_session_usage_count(struct iscsi_session *sess) 793 { 794 spin_lock_bh(&sess->session_usage_lock); 795 sess->session_usage_count--; 796 797 if (!sess->session_usage_count && sess->session_waiting_on_uc) 798 complete(&sess->session_waiting_on_uc_comp); 799 800 spin_unlock_bh(&sess->session_usage_lock); 801 } 802 803 void iscsit_inc_session_usage_count(struct iscsi_session *sess) 804 { 805 spin_lock_bh(&sess->session_usage_lock); 806 sess->session_usage_count++; 807 spin_unlock_bh(&sess->session_usage_lock); 808 } 809 810 /* 811 * Setup conn->if_marker and conn->of_marker values based upon 812 * the initial marker-less interval. (see iSCSI v19 A.2) 813 */ 814 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn) 815 { 816 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0; 817 /* 818 * IFMarkInt and OFMarkInt are negotiated as 32-bit words. 819 */ 820 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4); 821 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4); 822 823 if (conn->conn_ops->OFMarker) { 824 /* 825 * Account for the first Login Command received not 826 * via iscsi_recv_msg(). 827 */ 828 conn->of_marker += ISCSI_HDR_LEN; 829 if (conn->of_marker <= OFMarkInt) { 830 conn->of_marker = (OFMarkInt - conn->of_marker); 831 } else { 832 login_ofmarker_count = (conn->of_marker / OFMarkInt); 833 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) + 834 (login_ofmarker_count * MARKER_SIZE); 835 conn->of_marker = (next_marker - conn->of_marker); 836 } 837 conn->of_marker_offset = 0; 838 pr_debug("Setting OFMarker value to %u based on Initial" 839 " Markerless Interval.\n", conn->of_marker); 840 } 841 842 if (conn->conn_ops->IFMarker) { 843 if (conn->if_marker <= IFMarkInt) { 844 conn->if_marker = (IFMarkInt - conn->if_marker); 845 } else { 846 login_ifmarker_count = (conn->if_marker / IFMarkInt); 847 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) + 848 (login_ifmarker_count * MARKER_SIZE); 849 conn->if_marker = (next_marker - conn->if_marker); 850 } 851 pr_debug("Setting IFMarker value to %u based on Initial" 852 " Markerless Interval.\n", conn->if_marker); 853 } 854 855 return 0; 856 } 857 858 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid) 859 { 860 struct iscsi_conn *conn; 861 862 spin_lock_bh(&sess->conn_lock); 863 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 864 if ((conn->cid == cid) && 865 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) { 866 iscsit_inc_conn_usage_count(conn); 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 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid) 877 { 878 struct iscsi_conn *conn; 879 880 spin_lock_bh(&sess->conn_lock); 881 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 882 if (conn->cid == cid) { 883 iscsit_inc_conn_usage_count(conn); 884 spin_lock(&conn->state_lock); 885 atomic_set(&conn->connection_wait_rcfr, 1); 886 spin_unlock(&conn->state_lock); 887 spin_unlock_bh(&sess->conn_lock); 888 return conn; 889 } 890 } 891 spin_unlock_bh(&sess->conn_lock); 892 893 return NULL; 894 } 895 896 void iscsit_check_conn_usage_count(struct iscsi_conn *conn) 897 { 898 spin_lock_bh(&conn->conn_usage_lock); 899 if (conn->conn_usage_count != 0) { 900 conn->conn_waiting_on_uc = 1; 901 spin_unlock_bh(&conn->conn_usage_lock); 902 903 wait_for_completion(&conn->conn_waiting_on_uc_comp); 904 return; 905 } 906 spin_unlock_bh(&conn->conn_usage_lock); 907 } 908 909 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn) 910 { 911 spin_lock_bh(&conn->conn_usage_lock); 912 conn->conn_usage_count--; 913 914 if (!conn->conn_usage_count && conn->conn_waiting_on_uc) 915 complete(&conn->conn_waiting_on_uc_comp); 916 917 spin_unlock_bh(&conn->conn_usage_lock); 918 } 919 920 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn) 921 { 922 spin_lock_bh(&conn->conn_usage_lock); 923 conn->conn_usage_count++; 924 spin_unlock_bh(&conn->conn_usage_lock); 925 } 926 927 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response) 928 { 929 u8 state; 930 struct iscsi_cmd *cmd; 931 932 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING); 933 if (!cmd) 934 return -1; 935 936 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN; 937 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE : 938 ISTATE_SEND_NOPIN_NO_RESPONSE; 939 cmd->init_task_tag = RESERVED_ITT; 940 spin_lock_bh(&conn->sess->ttt_lock); 941 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ : 942 0xFFFFFFFF; 943 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF)) 944 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 945 spin_unlock_bh(&conn->sess->ttt_lock); 946 947 spin_lock_bh(&conn->cmd_lock); 948 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 949 spin_unlock_bh(&conn->cmd_lock); 950 951 if (want_response) 952 iscsit_start_nopin_response_timer(conn); 953 iscsit_add_cmd_to_immediate_queue(cmd, conn, state); 954 955 return 0; 956 } 957 958 static void iscsit_handle_nopin_response_timeout(unsigned long data) 959 { 960 struct iscsi_conn *conn = (struct iscsi_conn *) data; 961 962 iscsit_inc_conn_usage_count(conn); 963 964 spin_lock_bh(&conn->nopin_timer_lock); 965 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) { 966 spin_unlock_bh(&conn->nopin_timer_lock); 967 iscsit_dec_conn_usage_count(conn); 968 return; 969 } 970 971 pr_debug("Did not receive response to NOPIN on CID: %hu on" 972 " SID: %u, failing connection.\n", conn->cid, 973 conn->sess->sid); 974 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 975 spin_unlock_bh(&conn->nopin_timer_lock); 976 977 { 978 struct iscsi_portal_group *tpg = conn->sess->tpg; 979 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 980 981 if (tiqn) { 982 spin_lock_bh(&tiqn->sess_err_stats.lock); 983 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, 984 conn->sess->sess_ops->InitiatorName); 985 tiqn->sess_err_stats.last_sess_failure_type = 986 ISCSI_SESS_ERR_CXN_TIMEOUT; 987 tiqn->sess_err_stats.cxn_timeout_errors++; 988 atomic_long_inc(&conn->sess->conn_timeout_errors); 989 spin_unlock_bh(&tiqn->sess_err_stats.lock); 990 } 991 } 992 993 iscsit_cause_connection_reinstatement(conn, 0); 994 iscsit_dec_conn_usage_count(conn); 995 } 996 997 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn) 998 { 999 struct iscsi_session *sess = conn->sess; 1000 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1001 1002 spin_lock_bh(&conn->nopin_timer_lock); 1003 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 1004 spin_unlock_bh(&conn->nopin_timer_lock); 1005 return; 1006 } 1007 1008 mod_timer(&conn->nopin_response_timer, 1009 (get_jiffies_64() + na->nopin_response_timeout * HZ)); 1010 spin_unlock_bh(&conn->nopin_timer_lock); 1011 } 1012 1013 /* 1014 * Called with conn->nopin_timer_lock held. 1015 */ 1016 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn) 1017 { 1018 struct iscsi_session *sess = conn->sess; 1019 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1020 1021 spin_lock_bh(&conn->nopin_timer_lock); 1022 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) { 1023 spin_unlock_bh(&conn->nopin_timer_lock); 1024 return; 1025 } 1026 1027 init_timer(&conn->nopin_response_timer); 1028 conn->nopin_response_timer.expires = 1029 (get_jiffies_64() + na->nopin_response_timeout * HZ); 1030 conn->nopin_response_timer.data = (unsigned long)conn; 1031 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout; 1032 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; 1033 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; 1034 add_timer(&conn->nopin_response_timer); 1035 1036 pr_debug("Started NOPIN Response Timer on CID: %d to %u" 1037 " seconds\n", conn->cid, na->nopin_response_timeout); 1038 spin_unlock_bh(&conn->nopin_timer_lock); 1039 } 1040 1041 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn) 1042 { 1043 spin_lock_bh(&conn->nopin_timer_lock); 1044 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 1045 spin_unlock_bh(&conn->nopin_timer_lock); 1046 return; 1047 } 1048 conn->nopin_response_timer_flags |= ISCSI_TF_STOP; 1049 spin_unlock_bh(&conn->nopin_timer_lock); 1050 1051 del_timer_sync(&conn->nopin_response_timer); 1052 1053 spin_lock_bh(&conn->nopin_timer_lock); 1054 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 1055 spin_unlock_bh(&conn->nopin_timer_lock); 1056 } 1057 1058 static void iscsit_handle_nopin_timeout(unsigned long data) 1059 { 1060 struct iscsi_conn *conn = (struct iscsi_conn *) data; 1061 1062 iscsit_inc_conn_usage_count(conn); 1063 1064 spin_lock_bh(&conn->nopin_timer_lock); 1065 if (conn->nopin_timer_flags & ISCSI_TF_STOP) { 1066 spin_unlock_bh(&conn->nopin_timer_lock); 1067 iscsit_dec_conn_usage_count(conn); 1068 return; 1069 } 1070 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1071 spin_unlock_bh(&conn->nopin_timer_lock); 1072 1073 iscsit_add_nopin(conn, 1); 1074 iscsit_dec_conn_usage_count(conn); 1075 } 1076 1077 /* 1078 * Called with conn->nopin_timer_lock held. 1079 */ 1080 void __iscsit_start_nopin_timer(struct iscsi_conn *conn) 1081 { 1082 struct iscsi_session *sess = conn->sess; 1083 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1084 /* 1085 * NOPIN timeout is disabled. 1086 */ 1087 if (!na->nopin_timeout) 1088 return; 1089 1090 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) 1091 return; 1092 1093 init_timer(&conn->nopin_timer); 1094 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1095 conn->nopin_timer.data = (unsigned long)conn; 1096 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1097 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1098 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1099 add_timer(&conn->nopin_timer); 1100 1101 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1102 " interval\n", conn->cid, na->nopin_timeout); 1103 } 1104 1105 void iscsit_start_nopin_timer(struct iscsi_conn *conn) 1106 { 1107 struct iscsi_session *sess = conn->sess; 1108 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1109 /* 1110 * NOPIN timeout is disabled.. 1111 */ 1112 if (!na->nopin_timeout) 1113 return; 1114 1115 spin_lock_bh(&conn->nopin_timer_lock); 1116 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) { 1117 spin_unlock_bh(&conn->nopin_timer_lock); 1118 return; 1119 } 1120 1121 init_timer(&conn->nopin_timer); 1122 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1123 conn->nopin_timer.data = (unsigned long)conn; 1124 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1125 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1126 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1127 add_timer(&conn->nopin_timer); 1128 1129 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1130 " interval\n", conn->cid, na->nopin_timeout); 1131 spin_unlock_bh(&conn->nopin_timer_lock); 1132 } 1133 1134 void iscsit_stop_nopin_timer(struct iscsi_conn *conn) 1135 { 1136 spin_lock_bh(&conn->nopin_timer_lock); 1137 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) { 1138 spin_unlock_bh(&conn->nopin_timer_lock); 1139 return; 1140 } 1141 conn->nopin_timer_flags |= ISCSI_TF_STOP; 1142 spin_unlock_bh(&conn->nopin_timer_lock); 1143 1144 del_timer_sync(&conn->nopin_timer); 1145 1146 spin_lock_bh(&conn->nopin_timer_lock); 1147 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1148 spin_unlock_bh(&conn->nopin_timer_lock); 1149 } 1150 1151 int iscsit_send_tx_data( 1152 struct iscsi_cmd *cmd, 1153 struct iscsi_conn *conn, 1154 int use_misc) 1155 { 1156 int tx_sent, tx_size; 1157 u32 iov_count; 1158 struct kvec *iov; 1159 1160 send_data: 1161 tx_size = cmd->tx_size; 1162 1163 if (!use_misc) { 1164 iov = &cmd->iov_data[0]; 1165 iov_count = cmd->iov_data_count; 1166 } else { 1167 iov = &cmd->iov_misc[0]; 1168 iov_count = cmd->iov_misc_count; 1169 } 1170 1171 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size); 1172 if (tx_size != tx_sent) { 1173 if (tx_sent == -EAGAIN) { 1174 pr_err("tx_data() returned -EAGAIN\n"); 1175 goto send_data; 1176 } else 1177 return -1; 1178 } 1179 cmd->tx_size = 0; 1180 1181 return 0; 1182 } 1183 1184 int iscsit_fe_sendpage_sg( 1185 struct iscsi_cmd *cmd, 1186 struct iscsi_conn *conn) 1187 { 1188 struct scatterlist *sg = cmd->first_data_sg; 1189 struct kvec iov; 1190 u32 tx_hdr_size, data_len; 1191 u32 offset = cmd->first_data_sg_off; 1192 int tx_sent, iov_off; 1193 1194 send_hdr: 1195 tx_hdr_size = ISCSI_HDR_LEN; 1196 if (conn->conn_ops->HeaderDigest) 1197 tx_hdr_size += ISCSI_CRC_LEN; 1198 1199 iov.iov_base = cmd->pdu; 1200 iov.iov_len = tx_hdr_size; 1201 1202 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size); 1203 if (tx_hdr_size != tx_sent) { 1204 if (tx_sent == -EAGAIN) { 1205 pr_err("tx_data() returned -EAGAIN\n"); 1206 goto send_hdr; 1207 } 1208 return -1; 1209 } 1210 1211 data_len = cmd->tx_size - tx_hdr_size - cmd->padding; 1212 /* 1213 * Set iov_off used by padding and data digest tx_data() calls below 1214 * in order to determine proper offset into cmd->iov_data[] 1215 */ 1216 if (conn->conn_ops->DataDigest) { 1217 data_len -= ISCSI_CRC_LEN; 1218 if (cmd->padding) 1219 iov_off = (cmd->iov_data_count - 2); 1220 else 1221 iov_off = (cmd->iov_data_count - 1); 1222 } else { 1223 iov_off = (cmd->iov_data_count - 1); 1224 } 1225 /* 1226 * Perform sendpage() for each page in the scatterlist 1227 */ 1228 while (data_len) { 1229 u32 space = (sg->length - offset); 1230 u32 sub_len = min_t(u32, data_len, space); 1231 send_pg: 1232 tx_sent = conn->sock->ops->sendpage(conn->sock, 1233 sg_page(sg), sg->offset + offset, sub_len, 0); 1234 if (tx_sent != sub_len) { 1235 if (tx_sent == -EAGAIN) { 1236 pr_err("tcp_sendpage() returned" 1237 " -EAGAIN\n"); 1238 goto send_pg; 1239 } 1240 1241 pr_err("tcp_sendpage() failure: %d\n", 1242 tx_sent); 1243 return -1; 1244 } 1245 1246 data_len -= sub_len; 1247 offset = 0; 1248 sg = sg_next(sg); 1249 } 1250 1251 send_padding: 1252 if (cmd->padding) { 1253 struct kvec *iov_p = &cmd->iov_data[iov_off++]; 1254 1255 tx_sent = tx_data(conn, iov_p, 1, cmd->padding); 1256 if (cmd->padding != tx_sent) { 1257 if (tx_sent == -EAGAIN) { 1258 pr_err("tx_data() returned -EAGAIN\n"); 1259 goto send_padding; 1260 } 1261 return -1; 1262 } 1263 } 1264 1265 send_datacrc: 1266 if (conn->conn_ops->DataDigest) { 1267 struct kvec *iov_d = &cmd->iov_data[iov_off]; 1268 1269 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN); 1270 if (ISCSI_CRC_LEN != tx_sent) { 1271 if (tx_sent == -EAGAIN) { 1272 pr_err("tx_data() returned -EAGAIN\n"); 1273 goto send_datacrc; 1274 } 1275 return -1; 1276 } 1277 } 1278 1279 return 0; 1280 } 1281 1282 /* 1283 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU 1284 * back to the Initiator when an expection condition occurs with the 1285 * errors set in status_class and status_detail. 1286 * 1287 * Parameters: iSCSI Connection, Status Class, Status Detail. 1288 * Returns: 0 on success, -1 on error. 1289 */ 1290 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail) 1291 { 1292 struct iscsi_login_rsp *hdr; 1293 struct iscsi_login *login = conn->conn_login; 1294 1295 login->login_failed = 1; 1296 iscsit_collect_login_stats(conn, status_class, status_detail); 1297 1298 memset(&login->rsp[0], 0, ISCSI_HDR_LEN); 1299 1300 hdr = (struct iscsi_login_rsp *)&login->rsp[0]; 1301 hdr->opcode = ISCSI_OP_LOGIN_RSP; 1302 hdr->status_class = status_class; 1303 hdr->status_detail = status_detail; 1304 hdr->itt = conn->login_itt; 1305 1306 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0); 1307 } 1308 1309 void iscsit_print_session_params(struct iscsi_session *sess) 1310 { 1311 struct iscsi_conn *conn; 1312 1313 pr_debug("-----------------------------[Session Params for" 1314 " SID: %u]-----------------------------\n", sess->sid); 1315 spin_lock_bh(&sess->conn_lock); 1316 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 1317 iscsi_dump_conn_ops(conn->conn_ops); 1318 spin_unlock_bh(&sess->conn_lock); 1319 1320 iscsi_dump_sess_ops(sess->sess_ops); 1321 } 1322 1323 static int iscsit_do_rx_data( 1324 struct iscsi_conn *conn, 1325 struct iscsi_data_count *count) 1326 { 1327 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len; 1328 struct kvec *iov_p; 1329 struct msghdr msg; 1330 1331 if (!conn || !conn->sock || !conn->conn_ops) 1332 return -1; 1333 1334 memset(&msg, 0, sizeof(struct msghdr)); 1335 1336 iov_p = count->iov; 1337 iov_len = count->iov_count; 1338 1339 while (total_rx < data) { 1340 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len, 1341 (data - total_rx), MSG_WAITALL); 1342 if (rx_loop <= 0) { 1343 pr_debug("rx_loop: %d total_rx: %d\n", 1344 rx_loop, total_rx); 1345 return rx_loop; 1346 } 1347 total_rx += rx_loop; 1348 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n", 1349 rx_loop, total_rx, data); 1350 } 1351 1352 return total_rx; 1353 } 1354 1355 static int iscsit_do_tx_data( 1356 struct iscsi_conn *conn, 1357 struct iscsi_data_count *count) 1358 { 1359 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len; 1360 struct kvec *iov_p; 1361 struct msghdr msg; 1362 1363 if (!conn || !conn->sock || !conn->conn_ops) 1364 return -1; 1365 1366 if (data <= 0) { 1367 pr_err("Data length is: %d\n", data); 1368 return -1; 1369 } 1370 1371 memset(&msg, 0, sizeof(struct msghdr)); 1372 1373 iov_p = count->iov; 1374 iov_len = count->iov_count; 1375 1376 while (total_tx < data) { 1377 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len, 1378 (data - total_tx)); 1379 if (tx_loop <= 0) { 1380 pr_debug("tx_loop: %d total_tx %d\n", 1381 tx_loop, total_tx); 1382 return tx_loop; 1383 } 1384 total_tx += tx_loop; 1385 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n", 1386 tx_loop, total_tx, data); 1387 } 1388 1389 return total_tx; 1390 } 1391 1392 int rx_data( 1393 struct iscsi_conn *conn, 1394 struct kvec *iov, 1395 int iov_count, 1396 int data) 1397 { 1398 struct iscsi_data_count c; 1399 1400 if (!conn || !conn->sock || !conn->conn_ops) 1401 return -1; 1402 1403 memset(&c, 0, sizeof(struct iscsi_data_count)); 1404 c.iov = iov; 1405 c.iov_count = iov_count; 1406 c.data_length = data; 1407 c.type = ISCSI_RX_DATA; 1408 1409 return iscsit_do_rx_data(conn, &c); 1410 } 1411 1412 int tx_data( 1413 struct iscsi_conn *conn, 1414 struct kvec *iov, 1415 int iov_count, 1416 int data) 1417 { 1418 struct iscsi_data_count c; 1419 1420 if (!conn || !conn->sock || !conn->conn_ops) 1421 return -1; 1422 1423 memset(&c, 0, sizeof(struct iscsi_data_count)); 1424 c.iov = iov; 1425 c.iov_count = iov_count; 1426 c.data_length = data; 1427 c.type = ISCSI_TX_DATA; 1428 1429 return iscsit_do_tx_data(conn, &c); 1430 } 1431 1432 void iscsit_collect_login_stats( 1433 struct iscsi_conn *conn, 1434 u8 status_class, 1435 u8 status_detail) 1436 { 1437 struct iscsi_param *intrname = NULL; 1438 struct iscsi_tiqn *tiqn; 1439 struct iscsi_login_stats *ls; 1440 1441 tiqn = iscsit_snmp_get_tiqn(conn); 1442 if (!tiqn) 1443 return; 1444 1445 ls = &tiqn->login_stats; 1446 1447 spin_lock(&ls->lock); 1448 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) && 1449 ((get_jiffies_64() - ls->last_fail_time) < 10)) { 1450 /* We already have the failure info for this login */ 1451 spin_unlock(&ls->lock); 1452 return; 1453 } 1454 1455 if (status_class == ISCSI_STATUS_CLS_SUCCESS) 1456 ls->accepts++; 1457 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) { 1458 ls->redirects++; 1459 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT; 1460 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1461 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) { 1462 ls->authenticate_fails++; 1463 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE; 1464 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1465 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) { 1466 ls->authorize_fails++; 1467 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE; 1468 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1469 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) { 1470 ls->negotiate_fails++; 1471 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE; 1472 } else { 1473 ls->other_fails++; 1474 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER; 1475 } 1476 1477 /* Save initiator name, ip address and time, if it is a failed login */ 1478 if (status_class != ISCSI_STATUS_CLS_SUCCESS) { 1479 if (conn->param_list) 1480 intrname = iscsi_find_param_from_key(INITIATORNAME, 1481 conn->param_list); 1482 strcpy(ls->last_intr_fail_name, 1483 (intrname ? intrname->value : "Unknown")); 1484 1485 ls->last_intr_fail_ip_family = conn->login_family; 1486 1487 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE, 1488 "%s", conn->login_ip); 1489 ls->last_fail_time = get_jiffies_64(); 1490 } 1491 1492 spin_unlock(&ls->lock); 1493 } 1494 1495 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn) 1496 { 1497 struct iscsi_portal_group *tpg; 1498 1499 if (!conn || !conn->sess) 1500 return NULL; 1501 1502 tpg = conn->sess->tpg; 1503 if (!tpg) 1504 return NULL; 1505 1506 if (!tpg->tpg_tiqn) 1507 return NULL; 1508 1509 return tpg->tpg_tiqn; 1510 } 1511