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->cmd_flags & ICF_GOT_LAST_DATAOUT) 404 continue; 405 if (cmd->init_task_tag == init_task_tag) { 406 spin_unlock_bh(&conn->cmd_lock); 407 return cmd; 408 } 409 } 410 spin_unlock_bh(&conn->cmd_lock); 411 412 pr_err("Unable to locate ITT: 0x%08x on CID: %hu," 413 " dumping payload\n", init_task_tag, conn->cid); 414 if (length) 415 iscsit_dump_data_payload(conn, length, 1); 416 417 return NULL; 418 } 419 420 struct iscsi_cmd *iscsit_find_cmd_from_ttt( 421 struct iscsi_conn *conn, 422 u32 targ_xfer_tag) 423 { 424 struct iscsi_cmd *cmd = NULL; 425 426 spin_lock_bh(&conn->cmd_lock); 427 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 428 if (cmd->targ_xfer_tag == targ_xfer_tag) { 429 spin_unlock_bh(&conn->cmd_lock); 430 return cmd; 431 } 432 } 433 spin_unlock_bh(&conn->cmd_lock); 434 435 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n", 436 targ_xfer_tag, conn->cid); 437 return NULL; 438 } 439 440 int iscsit_find_cmd_for_recovery( 441 struct iscsi_session *sess, 442 struct iscsi_cmd **cmd_ptr, 443 struct iscsi_conn_recovery **cr_ptr, 444 itt_t init_task_tag) 445 { 446 struct iscsi_cmd *cmd = NULL; 447 struct iscsi_conn_recovery *cr; 448 /* 449 * Scan through the inactive connection recovery list's command list. 450 * If init_task_tag matches the command is still alligent. 451 */ 452 spin_lock(&sess->cr_i_lock); 453 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { 454 spin_lock(&cr->conn_recovery_cmd_lock); 455 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 456 if (cmd->init_task_tag == init_task_tag) { 457 spin_unlock(&cr->conn_recovery_cmd_lock); 458 spin_unlock(&sess->cr_i_lock); 459 460 *cr_ptr = cr; 461 *cmd_ptr = cmd; 462 return -2; 463 } 464 } 465 spin_unlock(&cr->conn_recovery_cmd_lock); 466 } 467 spin_unlock(&sess->cr_i_lock); 468 /* 469 * Scan through the active connection recovery list's command list. 470 * If init_task_tag matches the command is ready to be reassigned. 471 */ 472 spin_lock(&sess->cr_a_lock); 473 list_for_each_entry(cr, &sess->cr_active_list, cr_list) { 474 spin_lock(&cr->conn_recovery_cmd_lock); 475 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 476 if (cmd->init_task_tag == init_task_tag) { 477 spin_unlock(&cr->conn_recovery_cmd_lock); 478 spin_unlock(&sess->cr_a_lock); 479 480 *cr_ptr = cr; 481 *cmd_ptr = cmd; 482 return 0; 483 } 484 } 485 spin_unlock(&cr->conn_recovery_cmd_lock); 486 } 487 spin_unlock(&sess->cr_a_lock); 488 489 return -1; 490 } 491 492 void iscsit_add_cmd_to_immediate_queue( 493 struct iscsi_cmd *cmd, 494 struct iscsi_conn *conn, 495 u8 state) 496 { 497 struct iscsi_queue_req *qr; 498 499 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 500 if (!qr) { 501 pr_err("Unable to allocate memory for" 502 " struct iscsi_queue_req\n"); 503 return; 504 } 505 INIT_LIST_HEAD(&qr->qr_list); 506 qr->cmd = cmd; 507 qr->state = state; 508 509 spin_lock_bh(&conn->immed_queue_lock); 510 list_add_tail(&qr->qr_list, &conn->immed_queue_list); 511 atomic_inc(&cmd->immed_queue_count); 512 atomic_set(&conn->check_immediate_queue, 1); 513 spin_unlock_bh(&conn->immed_queue_lock); 514 515 wake_up(&conn->queues_wq); 516 } 517 518 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn) 519 { 520 struct iscsi_queue_req *qr; 521 522 spin_lock_bh(&conn->immed_queue_lock); 523 if (list_empty(&conn->immed_queue_list)) { 524 spin_unlock_bh(&conn->immed_queue_lock); 525 return NULL; 526 } 527 qr = list_first_entry(&conn->immed_queue_list, 528 struct iscsi_queue_req, qr_list); 529 530 list_del(&qr->qr_list); 531 if (qr->cmd) 532 atomic_dec(&qr->cmd->immed_queue_count); 533 spin_unlock_bh(&conn->immed_queue_lock); 534 535 return qr; 536 } 537 538 static void iscsit_remove_cmd_from_immediate_queue( 539 struct iscsi_cmd *cmd, 540 struct iscsi_conn *conn) 541 { 542 struct iscsi_queue_req *qr, *qr_tmp; 543 544 spin_lock_bh(&conn->immed_queue_lock); 545 if (!atomic_read(&cmd->immed_queue_count)) { 546 spin_unlock_bh(&conn->immed_queue_lock); 547 return; 548 } 549 550 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 551 if (qr->cmd != cmd) 552 continue; 553 554 atomic_dec(&qr->cmd->immed_queue_count); 555 list_del(&qr->qr_list); 556 kmem_cache_free(lio_qr_cache, qr); 557 } 558 spin_unlock_bh(&conn->immed_queue_lock); 559 560 if (atomic_read(&cmd->immed_queue_count)) { 561 pr_err("ITT: 0x%08x immed_queue_count: %d\n", 562 cmd->init_task_tag, 563 atomic_read(&cmd->immed_queue_count)); 564 } 565 } 566 567 void iscsit_add_cmd_to_response_queue( 568 struct iscsi_cmd *cmd, 569 struct iscsi_conn *conn, 570 u8 state) 571 { 572 struct iscsi_queue_req *qr; 573 574 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 575 if (!qr) { 576 pr_err("Unable to allocate memory for" 577 " struct iscsi_queue_req\n"); 578 return; 579 } 580 INIT_LIST_HEAD(&qr->qr_list); 581 qr->cmd = cmd; 582 qr->state = state; 583 584 spin_lock_bh(&conn->response_queue_lock); 585 list_add_tail(&qr->qr_list, &conn->response_queue_list); 586 atomic_inc(&cmd->response_queue_count); 587 spin_unlock_bh(&conn->response_queue_lock); 588 589 wake_up(&conn->queues_wq); 590 } 591 592 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn) 593 { 594 struct iscsi_queue_req *qr; 595 596 spin_lock_bh(&conn->response_queue_lock); 597 if (list_empty(&conn->response_queue_list)) { 598 spin_unlock_bh(&conn->response_queue_lock); 599 return NULL; 600 } 601 602 qr = list_first_entry(&conn->response_queue_list, 603 struct iscsi_queue_req, qr_list); 604 605 list_del(&qr->qr_list); 606 if (qr->cmd) 607 atomic_dec(&qr->cmd->response_queue_count); 608 spin_unlock_bh(&conn->response_queue_lock); 609 610 return qr; 611 } 612 613 static void iscsit_remove_cmd_from_response_queue( 614 struct iscsi_cmd *cmd, 615 struct iscsi_conn *conn) 616 { 617 struct iscsi_queue_req *qr, *qr_tmp; 618 619 spin_lock_bh(&conn->response_queue_lock); 620 if (!atomic_read(&cmd->response_queue_count)) { 621 spin_unlock_bh(&conn->response_queue_lock); 622 return; 623 } 624 625 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 626 qr_list) { 627 if (qr->cmd != cmd) 628 continue; 629 630 atomic_dec(&qr->cmd->response_queue_count); 631 list_del(&qr->qr_list); 632 kmem_cache_free(lio_qr_cache, qr); 633 } 634 spin_unlock_bh(&conn->response_queue_lock); 635 636 if (atomic_read(&cmd->response_queue_count)) { 637 pr_err("ITT: 0x%08x response_queue_count: %d\n", 638 cmd->init_task_tag, 639 atomic_read(&cmd->response_queue_count)); 640 } 641 } 642 643 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn) 644 { 645 bool empty; 646 647 spin_lock_bh(&conn->immed_queue_lock); 648 empty = list_empty(&conn->immed_queue_list); 649 spin_unlock_bh(&conn->immed_queue_lock); 650 651 if (!empty) 652 return empty; 653 654 spin_lock_bh(&conn->response_queue_lock); 655 empty = list_empty(&conn->response_queue_list); 656 spin_unlock_bh(&conn->response_queue_lock); 657 658 return empty; 659 } 660 661 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn) 662 { 663 struct iscsi_queue_req *qr, *qr_tmp; 664 665 spin_lock_bh(&conn->immed_queue_lock); 666 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 667 list_del(&qr->qr_list); 668 if (qr->cmd) 669 atomic_dec(&qr->cmd->immed_queue_count); 670 671 kmem_cache_free(lio_qr_cache, qr); 672 } 673 spin_unlock_bh(&conn->immed_queue_lock); 674 675 spin_lock_bh(&conn->response_queue_lock); 676 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 677 qr_list) { 678 list_del(&qr->qr_list); 679 if (qr->cmd) 680 atomic_dec(&qr->cmd->response_queue_count); 681 682 kmem_cache_free(lio_qr_cache, qr); 683 } 684 spin_unlock_bh(&conn->response_queue_lock); 685 } 686 687 void iscsit_release_cmd(struct iscsi_cmd *cmd) 688 { 689 struct iscsi_session *sess; 690 struct se_cmd *se_cmd = &cmd->se_cmd; 691 692 if (cmd->conn) 693 sess = cmd->conn->sess; 694 else 695 sess = cmd->sess; 696 697 BUG_ON(!sess || !sess->se_sess); 698 699 kfree(cmd->buf_ptr); 700 kfree(cmd->pdu_list); 701 kfree(cmd->seq_list); 702 kfree(cmd->tmr_req); 703 kfree(cmd->iov_data); 704 kfree(cmd->text_in_ptr); 705 706 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag); 707 } 708 EXPORT_SYMBOL(iscsit_release_cmd); 709 710 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd, 711 bool check_queues) 712 { 713 struct iscsi_conn *conn = cmd->conn; 714 715 if (scsi_cmd) { 716 if (cmd->data_direction == DMA_TO_DEVICE) { 717 iscsit_stop_dataout_timer(cmd); 718 iscsit_free_r2ts_from_list(cmd); 719 } 720 if (cmd->data_direction == DMA_FROM_DEVICE) 721 iscsit_free_all_datain_reqs(cmd); 722 } 723 724 if (conn && check_queues) { 725 iscsit_remove_cmd_from_immediate_queue(cmd, conn); 726 iscsit_remove_cmd_from_response_queue(cmd, conn); 727 } 728 } 729 730 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) 731 { 732 struct se_cmd *se_cmd = NULL; 733 int rc; 734 /* 735 * Determine if a struct se_cmd is associated with 736 * this struct iscsi_cmd. 737 */ 738 switch (cmd->iscsi_opcode) { 739 case ISCSI_OP_SCSI_CMD: 740 se_cmd = &cmd->se_cmd; 741 __iscsit_free_cmd(cmd, true, shutdown); 742 /* 743 * Fallthrough 744 */ 745 case ISCSI_OP_SCSI_TMFUNC: 746 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown); 747 if (!rc && shutdown && se_cmd && se_cmd->se_sess) { 748 __iscsit_free_cmd(cmd, true, shutdown); 749 target_put_sess_cmd(se_cmd->se_sess, se_cmd); 750 } 751 break; 752 case ISCSI_OP_REJECT: 753 /* 754 * Handle special case for REJECT when iscsi_add_reject*() has 755 * overwritten the original iscsi_opcode assignment, and the 756 * associated cmd->se_cmd needs to be released. 757 */ 758 if (cmd->se_cmd.se_tfo != NULL) { 759 se_cmd = &cmd->se_cmd; 760 __iscsit_free_cmd(cmd, true, shutdown); 761 762 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown); 763 if (!rc && shutdown && se_cmd->se_sess) { 764 __iscsit_free_cmd(cmd, true, shutdown); 765 target_put_sess_cmd(se_cmd->se_sess, se_cmd); 766 } 767 break; 768 } 769 /* Fall-through */ 770 default: 771 __iscsit_free_cmd(cmd, false, shutdown); 772 iscsit_release_cmd(cmd); 773 break; 774 } 775 } 776 777 int iscsit_check_session_usage_count(struct iscsi_session *sess) 778 { 779 spin_lock_bh(&sess->session_usage_lock); 780 if (sess->session_usage_count != 0) { 781 sess->session_waiting_on_uc = 1; 782 spin_unlock_bh(&sess->session_usage_lock); 783 if (in_interrupt()) 784 return 2; 785 786 wait_for_completion(&sess->session_waiting_on_uc_comp); 787 return 1; 788 } 789 spin_unlock_bh(&sess->session_usage_lock); 790 791 return 0; 792 } 793 794 void iscsit_dec_session_usage_count(struct iscsi_session *sess) 795 { 796 spin_lock_bh(&sess->session_usage_lock); 797 sess->session_usage_count--; 798 799 if (!sess->session_usage_count && sess->session_waiting_on_uc) 800 complete(&sess->session_waiting_on_uc_comp); 801 802 spin_unlock_bh(&sess->session_usage_lock); 803 } 804 805 void iscsit_inc_session_usage_count(struct iscsi_session *sess) 806 { 807 spin_lock_bh(&sess->session_usage_lock); 808 sess->session_usage_count++; 809 spin_unlock_bh(&sess->session_usage_lock); 810 } 811 812 /* 813 * Setup conn->if_marker and conn->of_marker values based upon 814 * the initial marker-less interval. (see iSCSI v19 A.2) 815 */ 816 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn) 817 { 818 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0; 819 /* 820 * IFMarkInt and OFMarkInt are negotiated as 32-bit words. 821 */ 822 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4); 823 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4); 824 825 if (conn->conn_ops->OFMarker) { 826 /* 827 * Account for the first Login Command received not 828 * via iscsi_recv_msg(). 829 */ 830 conn->of_marker += ISCSI_HDR_LEN; 831 if (conn->of_marker <= OFMarkInt) { 832 conn->of_marker = (OFMarkInt - conn->of_marker); 833 } else { 834 login_ofmarker_count = (conn->of_marker / OFMarkInt); 835 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) + 836 (login_ofmarker_count * MARKER_SIZE); 837 conn->of_marker = (next_marker - conn->of_marker); 838 } 839 conn->of_marker_offset = 0; 840 pr_debug("Setting OFMarker value to %u based on Initial" 841 " Markerless Interval.\n", conn->of_marker); 842 } 843 844 if (conn->conn_ops->IFMarker) { 845 if (conn->if_marker <= IFMarkInt) { 846 conn->if_marker = (IFMarkInt - conn->if_marker); 847 } else { 848 login_ifmarker_count = (conn->if_marker / IFMarkInt); 849 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) + 850 (login_ifmarker_count * MARKER_SIZE); 851 conn->if_marker = (next_marker - conn->if_marker); 852 } 853 pr_debug("Setting IFMarker value to %u based on Initial" 854 " Markerless Interval.\n", conn->if_marker); 855 } 856 857 return 0; 858 } 859 860 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid) 861 { 862 struct iscsi_conn *conn; 863 864 spin_lock_bh(&sess->conn_lock); 865 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 866 if ((conn->cid == cid) && 867 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) { 868 iscsit_inc_conn_usage_count(conn); 869 spin_unlock_bh(&sess->conn_lock); 870 return conn; 871 } 872 } 873 spin_unlock_bh(&sess->conn_lock); 874 875 return NULL; 876 } 877 878 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid) 879 { 880 struct iscsi_conn *conn; 881 882 spin_lock_bh(&sess->conn_lock); 883 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 884 if (conn->cid == cid) { 885 iscsit_inc_conn_usage_count(conn); 886 spin_lock(&conn->state_lock); 887 atomic_set(&conn->connection_wait_rcfr, 1); 888 spin_unlock(&conn->state_lock); 889 spin_unlock_bh(&sess->conn_lock); 890 return conn; 891 } 892 } 893 spin_unlock_bh(&sess->conn_lock); 894 895 return NULL; 896 } 897 898 void iscsit_check_conn_usage_count(struct iscsi_conn *conn) 899 { 900 spin_lock_bh(&conn->conn_usage_lock); 901 if (conn->conn_usage_count != 0) { 902 conn->conn_waiting_on_uc = 1; 903 spin_unlock_bh(&conn->conn_usage_lock); 904 905 wait_for_completion(&conn->conn_waiting_on_uc_comp); 906 return; 907 } 908 spin_unlock_bh(&conn->conn_usage_lock); 909 } 910 911 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn) 912 { 913 spin_lock_bh(&conn->conn_usage_lock); 914 conn->conn_usage_count--; 915 916 if (!conn->conn_usage_count && conn->conn_waiting_on_uc) 917 complete(&conn->conn_waiting_on_uc_comp); 918 919 spin_unlock_bh(&conn->conn_usage_lock); 920 } 921 922 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn) 923 { 924 spin_lock_bh(&conn->conn_usage_lock); 925 conn->conn_usage_count++; 926 spin_unlock_bh(&conn->conn_usage_lock); 927 } 928 929 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response) 930 { 931 u8 state; 932 struct iscsi_cmd *cmd; 933 934 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING); 935 if (!cmd) 936 return -1; 937 938 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN; 939 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE : 940 ISTATE_SEND_NOPIN_NO_RESPONSE; 941 cmd->init_task_tag = RESERVED_ITT; 942 spin_lock_bh(&conn->sess->ttt_lock); 943 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ : 944 0xFFFFFFFF; 945 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF)) 946 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 947 spin_unlock_bh(&conn->sess->ttt_lock); 948 949 spin_lock_bh(&conn->cmd_lock); 950 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 951 spin_unlock_bh(&conn->cmd_lock); 952 953 if (want_response) 954 iscsit_start_nopin_response_timer(conn); 955 iscsit_add_cmd_to_immediate_queue(cmd, conn, state); 956 957 return 0; 958 } 959 960 static void iscsit_handle_nopin_response_timeout(unsigned long data) 961 { 962 struct iscsi_conn *conn = (struct iscsi_conn *) data; 963 964 iscsit_inc_conn_usage_count(conn); 965 966 spin_lock_bh(&conn->nopin_timer_lock); 967 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) { 968 spin_unlock_bh(&conn->nopin_timer_lock); 969 iscsit_dec_conn_usage_count(conn); 970 return; 971 } 972 973 pr_debug("Did not receive response to NOPIN on CID: %hu on" 974 " SID: %u, failing connection.\n", conn->cid, 975 conn->sess->sid); 976 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 977 spin_unlock_bh(&conn->nopin_timer_lock); 978 979 { 980 struct iscsi_portal_group *tpg = conn->sess->tpg; 981 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 982 983 if (tiqn) { 984 spin_lock_bh(&tiqn->sess_err_stats.lock); 985 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, 986 conn->sess->sess_ops->InitiatorName); 987 tiqn->sess_err_stats.last_sess_failure_type = 988 ISCSI_SESS_ERR_CXN_TIMEOUT; 989 tiqn->sess_err_stats.cxn_timeout_errors++; 990 atomic_long_inc(&conn->sess->conn_timeout_errors); 991 spin_unlock_bh(&tiqn->sess_err_stats.lock); 992 } 993 } 994 995 iscsit_cause_connection_reinstatement(conn, 0); 996 iscsit_dec_conn_usage_count(conn); 997 } 998 999 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn) 1000 { 1001 struct iscsi_session *sess = conn->sess; 1002 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1003 1004 spin_lock_bh(&conn->nopin_timer_lock); 1005 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 1006 spin_unlock_bh(&conn->nopin_timer_lock); 1007 return; 1008 } 1009 1010 mod_timer(&conn->nopin_response_timer, 1011 (get_jiffies_64() + na->nopin_response_timeout * HZ)); 1012 spin_unlock_bh(&conn->nopin_timer_lock); 1013 } 1014 1015 /* 1016 * Called with conn->nopin_timer_lock held. 1017 */ 1018 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn) 1019 { 1020 struct iscsi_session *sess = conn->sess; 1021 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1022 1023 spin_lock_bh(&conn->nopin_timer_lock); 1024 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) { 1025 spin_unlock_bh(&conn->nopin_timer_lock); 1026 return; 1027 } 1028 1029 init_timer(&conn->nopin_response_timer); 1030 conn->nopin_response_timer.expires = 1031 (get_jiffies_64() + na->nopin_response_timeout * HZ); 1032 conn->nopin_response_timer.data = (unsigned long)conn; 1033 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout; 1034 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; 1035 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; 1036 add_timer(&conn->nopin_response_timer); 1037 1038 pr_debug("Started NOPIN Response Timer on CID: %d to %u" 1039 " seconds\n", conn->cid, na->nopin_response_timeout); 1040 spin_unlock_bh(&conn->nopin_timer_lock); 1041 } 1042 1043 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn) 1044 { 1045 spin_lock_bh(&conn->nopin_timer_lock); 1046 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 1047 spin_unlock_bh(&conn->nopin_timer_lock); 1048 return; 1049 } 1050 conn->nopin_response_timer_flags |= ISCSI_TF_STOP; 1051 spin_unlock_bh(&conn->nopin_timer_lock); 1052 1053 del_timer_sync(&conn->nopin_response_timer); 1054 1055 spin_lock_bh(&conn->nopin_timer_lock); 1056 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 1057 spin_unlock_bh(&conn->nopin_timer_lock); 1058 } 1059 1060 static void iscsit_handle_nopin_timeout(unsigned long data) 1061 { 1062 struct iscsi_conn *conn = (struct iscsi_conn *) data; 1063 1064 iscsit_inc_conn_usage_count(conn); 1065 1066 spin_lock_bh(&conn->nopin_timer_lock); 1067 if (conn->nopin_timer_flags & ISCSI_TF_STOP) { 1068 spin_unlock_bh(&conn->nopin_timer_lock); 1069 iscsit_dec_conn_usage_count(conn); 1070 return; 1071 } 1072 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1073 spin_unlock_bh(&conn->nopin_timer_lock); 1074 1075 iscsit_add_nopin(conn, 1); 1076 iscsit_dec_conn_usage_count(conn); 1077 } 1078 1079 /* 1080 * Called with conn->nopin_timer_lock held. 1081 */ 1082 void __iscsit_start_nopin_timer(struct iscsi_conn *conn) 1083 { 1084 struct iscsi_session *sess = conn->sess; 1085 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1086 /* 1087 * NOPIN timeout is disabled. 1088 */ 1089 if (!na->nopin_timeout) 1090 return; 1091 1092 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) 1093 return; 1094 1095 init_timer(&conn->nopin_timer); 1096 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1097 conn->nopin_timer.data = (unsigned long)conn; 1098 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1099 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1100 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1101 add_timer(&conn->nopin_timer); 1102 1103 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1104 " interval\n", conn->cid, na->nopin_timeout); 1105 } 1106 1107 void iscsit_start_nopin_timer(struct iscsi_conn *conn) 1108 { 1109 struct iscsi_session *sess = conn->sess; 1110 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1111 /* 1112 * NOPIN timeout is disabled.. 1113 */ 1114 if (!na->nopin_timeout) 1115 return; 1116 1117 spin_lock_bh(&conn->nopin_timer_lock); 1118 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) { 1119 spin_unlock_bh(&conn->nopin_timer_lock); 1120 return; 1121 } 1122 1123 init_timer(&conn->nopin_timer); 1124 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1125 conn->nopin_timer.data = (unsigned long)conn; 1126 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1127 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1128 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1129 add_timer(&conn->nopin_timer); 1130 1131 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1132 " interval\n", conn->cid, na->nopin_timeout); 1133 spin_unlock_bh(&conn->nopin_timer_lock); 1134 } 1135 1136 void iscsit_stop_nopin_timer(struct iscsi_conn *conn) 1137 { 1138 spin_lock_bh(&conn->nopin_timer_lock); 1139 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) { 1140 spin_unlock_bh(&conn->nopin_timer_lock); 1141 return; 1142 } 1143 conn->nopin_timer_flags |= ISCSI_TF_STOP; 1144 spin_unlock_bh(&conn->nopin_timer_lock); 1145 1146 del_timer_sync(&conn->nopin_timer); 1147 1148 spin_lock_bh(&conn->nopin_timer_lock); 1149 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1150 spin_unlock_bh(&conn->nopin_timer_lock); 1151 } 1152 1153 int iscsit_send_tx_data( 1154 struct iscsi_cmd *cmd, 1155 struct iscsi_conn *conn, 1156 int use_misc) 1157 { 1158 int tx_sent, tx_size; 1159 u32 iov_count; 1160 struct kvec *iov; 1161 1162 send_data: 1163 tx_size = cmd->tx_size; 1164 1165 if (!use_misc) { 1166 iov = &cmd->iov_data[0]; 1167 iov_count = cmd->iov_data_count; 1168 } else { 1169 iov = &cmd->iov_misc[0]; 1170 iov_count = cmd->iov_misc_count; 1171 } 1172 1173 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size); 1174 if (tx_size != tx_sent) { 1175 if (tx_sent == -EAGAIN) { 1176 pr_err("tx_data() returned -EAGAIN\n"); 1177 goto send_data; 1178 } else 1179 return -1; 1180 } 1181 cmd->tx_size = 0; 1182 1183 return 0; 1184 } 1185 1186 int iscsit_fe_sendpage_sg( 1187 struct iscsi_cmd *cmd, 1188 struct iscsi_conn *conn) 1189 { 1190 struct scatterlist *sg = cmd->first_data_sg; 1191 struct kvec iov; 1192 u32 tx_hdr_size, data_len; 1193 u32 offset = cmd->first_data_sg_off; 1194 int tx_sent, iov_off; 1195 1196 send_hdr: 1197 tx_hdr_size = ISCSI_HDR_LEN; 1198 if (conn->conn_ops->HeaderDigest) 1199 tx_hdr_size += ISCSI_CRC_LEN; 1200 1201 iov.iov_base = cmd->pdu; 1202 iov.iov_len = tx_hdr_size; 1203 1204 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size); 1205 if (tx_hdr_size != tx_sent) { 1206 if (tx_sent == -EAGAIN) { 1207 pr_err("tx_data() returned -EAGAIN\n"); 1208 goto send_hdr; 1209 } 1210 return -1; 1211 } 1212 1213 data_len = cmd->tx_size - tx_hdr_size - cmd->padding; 1214 /* 1215 * Set iov_off used by padding and data digest tx_data() calls below 1216 * in order to determine proper offset into cmd->iov_data[] 1217 */ 1218 if (conn->conn_ops->DataDigest) { 1219 data_len -= ISCSI_CRC_LEN; 1220 if (cmd->padding) 1221 iov_off = (cmd->iov_data_count - 2); 1222 else 1223 iov_off = (cmd->iov_data_count - 1); 1224 } else { 1225 iov_off = (cmd->iov_data_count - 1); 1226 } 1227 /* 1228 * Perform sendpage() for each page in the scatterlist 1229 */ 1230 while (data_len) { 1231 u32 space = (sg->length - offset); 1232 u32 sub_len = min_t(u32, data_len, space); 1233 send_pg: 1234 tx_sent = conn->sock->ops->sendpage(conn->sock, 1235 sg_page(sg), sg->offset + offset, sub_len, 0); 1236 if (tx_sent != sub_len) { 1237 if (tx_sent == -EAGAIN) { 1238 pr_err("tcp_sendpage() returned" 1239 " -EAGAIN\n"); 1240 goto send_pg; 1241 } 1242 1243 pr_err("tcp_sendpage() failure: %d\n", 1244 tx_sent); 1245 return -1; 1246 } 1247 1248 data_len -= sub_len; 1249 offset = 0; 1250 sg = sg_next(sg); 1251 } 1252 1253 send_padding: 1254 if (cmd->padding) { 1255 struct kvec *iov_p = &cmd->iov_data[iov_off++]; 1256 1257 tx_sent = tx_data(conn, iov_p, 1, cmd->padding); 1258 if (cmd->padding != tx_sent) { 1259 if (tx_sent == -EAGAIN) { 1260 pr_err("tx_data() returned -EAGAIN\n"); 1261 goto send_padding; 1262 } 1263 return -1; 1264 } 1265 } 1266 1267 send_datacrc: 1268 if (conn->conn_ops->DataDigest) { 1269 struct kvec *iov_d = &cmd->iov_data[iov_off]; 1270 1271 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN); 1272 if (ISCSI_CRC_LEN != tx_sent) { 1273 if (tx_sent == -EAGAIN) { 1274 pr_err("tx_data() returned -EAGAIN\n"); 1275 goto send_datacrc; 1276 } 1277 return -1; 1278 } 1279 } 1280 1281 return 0; 1282 } 1283 1284 /* 1285 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU 1286 * back to the Initiator when an expection condition occurs with the 1287 * errors set in status_class and status_detail. 1288 * 1289 * Parameters: iSCSI Connection, Status Class, Status Detail. 1290 * Returns: 0 on success, -1 on error. 1291 */ 1292 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail) 1293 { 1294 struct iscsi_login_rsp *hdr; 1295 struct iscsi_login *login = conn->conn_login; 1296 1297 login->login_failed = 1; 1298 iscsit_collect_login_stats(conn, status_class, status_detail); 1299 1300 memset(&login->rsp[0], 0, ISCSI_HDR_LEN); 1301 1302 hdr = (struct iscsi_login_rsp *)&login->rsp[0]; 1303 hdr->opcode = ISCSI_OP_LOGIN_RSP; 1304 hdr->status_class = status_class; 1305 hdr->status_detail = status_detail; 1306 hdr->itt = conn->login_itt; 1307 1308 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0); 1309 } 1310 1311 void iscsit_print_session_params(struct iscsi_session *sess) 1312 { 1313 struct iscsi_conn *conn; 1314 1315 pr_debug("-----------------------------[Session Params for" 1316 " SID: %u]-----------------------------\n", sess->sid); 1317 spin_lock_bh(&sess->conn_lock); 1318 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 1319 iscsi_dump_conn_ops(conn->conn_ops); 1320 spin_unlock_bh(&sess->conn_lock); 1321 1322 iscsi_dump_sess_ops(sess->sess_ops); 1323 } 1324 1325 static int iscsit_do_rx_data( 1326 struct iscsi_conn *conn, 1327 struct iscsi_data_count *count) 1328 { 1329 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len; 1330 struct kvec *iov_p; 1331 struct msghdr msg; 1332 1333 if (!conn || !conn->sock || !conn->conn_ops) 1334 return -1; 1335 1336 memset(&msg, 0, sizeof(struct msghdr)); 1337 1338 iov_p = count->iov; 1339 iov_len = count->iov_count; 1340 1341 while (total_rx < data) { 1342 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len, 1343 (data - total_rx), MSG_WAITALL); 1344 if (rx_loop <= 0) { 1345 pr_debug("rx_loop: %d total_rx: %d\n", 1346 rx_loop, total_rx); 1347 return rx_loop; 1348 } 1349 total_rx += rx_loop; 1350 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n", 1351 rx_loop, total_rx, data); 1352 } 1353 1354 return total_rx; 1355 } 1356 1357 static int iscsit_do_tx_data( 1358 struct iscsi_conn *conn, 1359 struct iscsi_data_count *count) 1360 { 1361 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len; 1362 struct kvec *iov_p; 1363 struct msghdr msg; 1364 1365 if (!conn || !conn->sock || !conn->conn_ops) 1366 return -1; 1367 1368 if (data <= 0) { 1369 pr_err("Data length is: %d\n", data); 1370 return -1; 1371 } 1372 1373 memset(&msg, 0, sizeof(struct msghdr)); 1374 1375 iov_p = count->iov; 1376 iov_len = count->iov_count; 1377 1378 while (total_tx < data) { 1379 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len, 1380 (data - total_tx)); 1381 if (tx_loop <= 0) { 1382 pr_debug("tx_loop: %d total_tx %d\n", 1383 tx_loop, total_tx); 1384 return tx_loop; 1385 } 1386 total_tx += tx_loop; 1387 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n", 1388 tx_loop, total_tx, data); 1389 } 1390 1391 return total_tx; 1392 } 1393 1394 int rx_data( 1395 struct iscsi_conn *conn, 1396 struct kvec *iov, 1397 int iov_count, 1398 int data) 1399 { 1400 struct iscsi_data_count c; 1401 1402 if (!conn || !conn->sock || !conn->conn_ops) 1403 return -1; 1404 1405 memset(&c, 0, sizeof(struct iscsi_data_count)); 1406 c.iov = iov; 1407 c.iov_count = iov_count; 1408 c.data_length = data; 1409 c.type = ISCSI_RX_DATA; 1410 1411 return iscsit_do_rx_data(conn, &c); 1412 } 1413 1414 int tx_data( 1415 struct iscsi_conn *conn, 1416 struct kvec *iov, 1417 int iov_count, 1418 int data) 1419 { 1420 struct iscsi_data_count c; 1421 1422 if (!conn || !conn->sock || !conn->conn_ops) 1423 return -1; 1424 1425 memset(&c, 0, sizeof(struct iscsi_data_count)); 1426 c.iov = iov; 1427 c.iov_count = iov_count; 1428 c.data_length = data; 1429 c.type = ISCSI_TX_DATA; 1430 1431 return iscsit_do_tx_data(conn, &c); 1432 } 1433 1434 void iscsit_collect_login_stats( 1435 struct iscsi_conn *conn, 1436 u8 status_class, 1437 u8 status_detail) 1438 { 1439 struct iscsi_param *intrname = NULL; 1440 struct iscsi_tiqn *tiqn; 1441 struct iscsi_login_stats *ls; 1442 1443 tiqn = iscsit_snmp_get_tiqn(conn); 1444 if (!tiqn) 1445 return; 1446 1447 ls = &tiqn->login_stats; 1448 1449 spin_lock(&ls->lock); 1450 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) && 1451 ((get_jiffies_64() - ls->last_fail_time) < 10)) { 1452 /* We already have the failure info for this login */ 1453 spin_unlock(&ls->lock); 1454 return; 1455 } 1456 1457 if (status_class == ISCSI_STATUS_CLS_SUCCESS) 1458 ls->accepts++; 1459 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) { 1460 ls->redirects++; 1461 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT; 1462 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1463 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) { 1464 ls->authenticate_fails++; 1465 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE; 1466 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1467 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) { 1468 ls->authorize_fails++; 1469 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE; 1470 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1471 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) { 1472 ls->negotiate_fails++; 1473 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE; 1474 } else { 1475 ls->other_fails++; 1476 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER; 1477 } 1478 1479 /* Save initiator name, ip address and time, if it is a failed login */ 1480 if (status_class != ISCSI_STATUS_CLS_SUCCESS) { 1481 if (conn->param_list) 1482 intrname = iscsi_find_param_from_key(INITIATORNAME, 1483 conn->param_list); 1484 strcpy(ls->last_intr_fail_name, 1485 (intrname ? intrname->value : "Unknown")); 1486 1487 ls->last_intr_fail_ip_family = conn->login_family; 1488 1489 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE, 1490 "%s", conn->login_ip); 1491 ls->last_fail_time = get_jiffies_64(); 1492 } 1493 1494 spin_unlock(&ls->lock); 1495 } 1496 1497 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn) 1498 { 1499 struct iscsi_portal_group *tpg; 1500 1501 if (!conn || !conn->sess) 1502 return NULL; 1503 1504 tpg = conn->sess->tpg; 1505 if (!tpg) 1506 return NULL; 1507 1508 if (!tpg->tpg_tiqn) 1509 return NULL; 1510 1511 return tpg->tpg_tiqn; 1512 } 1513