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, gfp_t gfp_mask) 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, gfp_mask); 162 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size; 163 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size)); 164 memset(cmd, 0, size); 165 166 cmd->se_cmd.map_tag = tag; 167 cmd->conn = conn; 168 INIT_LIST_HEAD(&cmd->i_conn_node); 169 INIT_LIST_HEAD(&cmd->datain_list); 170 INIT_LIST_HEAD(&cmd->cmd_r2t_list); 171 spin_lock_init(&cmd->datain_lock); 172 spin_lock_init(&cmd->dataout_timeout_lock); 173 spin_lock_init(&cmd->istate_lock); 174 spin_lock_init(&cmd->error_lock); 175 spin_lock_init(&cmd->r2t_lock); 176 177 return cmd; 178 } 179 EXPORT_SYMBOL(iscsit_allocate_cmd); 180 181 struct iscsi_seq *iscsit_get_seq_holder_for_datain( 182 struct iscsi_cmd *cmd, 183 u32 seq_send_order) 184 { 185 u32 i; 186 187 for (i = 0; i < cmd->seq_count; i++) 188 if (cmd->seq_list[i].seq_send_order == seq_send_order) 189 return &cmd->seq_list[i]; 190 191 return NULL; 192 } 193 194 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd) 195 { 196 u32 i; 197 198 if (!cmd->seq_list) { 199 pr_err("struct iscsi_cmd->seq_list is NULL!\n"); 200 return NULL; 201 } 202 203 for (i = 0; i < cmd->seq_count; i++) { 204 if (cmd->seq_list[i].type != SEQTYPE_NORMAL) 205 continue; 206 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) { 207 cmd->seq_send_order++; 208 return &cmd->seq_list[i]; 209 } 210 } 211 212 return NULL; 213 } 214 215 struct iscsi_r2t *iscsit_get_holder_for_r2tsn( 216 struct iscsi_cmd *cmd, 217 u32 r2t_sn) 218 { 219 struct iscsi_r2t *r2t; 220 221 spin_lock_bh(&cmd->r2t_lock); 222 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 223 if (r2t->r2t_sn == r2t_sn) { 224 spin_unlock_bh(&cmd->r2t_lock); 225 return r2t; 226 } 227 } 228 spin_unlock_bh(&cmd->r2t_lock); 229 230 return NULL; 231 } 232 233 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn) 234 { 235 int ret; 236 237 /* 238 * This is the proper method of checking received CmdSN against 239 * ExpCmdSN and MaxCmdSN values, as well as accounting for out 240 * or order CmdSNs due to multiple connection sessions and/or 241 * CRC failures. 242 */ 243 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) { 244 pr_err("Received CmdSN: 0x%08x is greater than" 245 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn, 246 sess->max_cmd_sn); 247 ret = CMDSN_ERROR_CANNOT_RECOVER; 248 249 } else if (cmdsn == sess->exp_cmd_sn) { 250 sess->exp_cmd_sn++; 251 pr_debug("Received CmdSN matches ExpCmdSN," 252 " incremented ExpCmdSN to: 0x%08x\n", 253 sess->exp_cmd_sn); 254 ret = CMDSN_NORMAL_OPERATION; 255 256 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) { 257 pr_debug("Received CmdSN: 0x%08x is greater" 258 " than ExpCmdSN: 0x%08x, not acknowledging.\n", 259 cmdsn, sess->exp_cmd_sn); 260 ret = CMDSN_HIGHER_THAN_EXP; 261 262 } else { 263 pr_err("Received CmdSN: 0x%08x is less than" 264 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn, 265 sess->exp_cmd_sn); 266 ret = CMDSN_LOWER_THAN_EXP; 267 } 268 269 return ret; 270 } 271 272 /* 273 * Commands may be received out of order if MC/S is in use. 274 * Ensure they are executed in CmdSN order. 275 */ 276 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 277 unsigned char *buf, __be32 cmdsn) 278 { 279 int ret, cmdsn_ret; 280 bool reject = false; 281 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES; 282 283 mutex_lock(&conn->sess->cmdsn_mutex); 284 285 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn)); 286 switch (cmdsn_ret) { 287 case CMDSN_NORMAL_OPERATION: 288 ret = iscsit_execute_cmd(cmd, 0); 289 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list)) 290 iscsit_execute_ooo_cmdsns(conn->sess); 291 else if (ret < 0) { 292 reject = true; 293 ret = CMDSN_ERROR_CANNOT_RECOVER; 294 } 295 break; 296 case CMDSN_HIGHER_THAN_EXP: 297 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn)); 298 if (ret < 0) { 299 reject = true; 300 ret = CMDSN_ERROR_CANNOT_RECOVER; 301 break; 302 } 303 ret = CMDSN_HIGHER_THAN_EXP; 304 break; 305 case CMDSN_LOWER_THAN_EXP: 306 cmd->i_state = ISTATE_REMOVE; 307 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 308 ret = cmdsn_ret; 309 break; 310 default: 311 reason = ISCSI_REASON_PROTOCOL_ERROR; 312 reject = true; 313 ret = cmdsn_ret; 314 break; 315 } 316 mutex_unlock(&conn->sess->cmdsn_mutex); 317 318 if (reject) 319 iscsit_reject_cmd(cmd, reason, buf); 320 321 return ret; 322 } 323 EXPORT_SYMBOL(iscsit_sequence_cmd); 324 325 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf) 326 { 327 struct iscsi_conn *conn = cmd->conn; 328 struct se_cmd *se_cmd = &cmd->se_cmd; 329 struct iscsi_data *hdr = (struct iscsi_data *) buf; 330 u32 payload_length = ntoh24(hdr->dlength); 331 332 if (conn->sess->sess_ops->InitialR2T) { 333 pr_err("Received unexpected unsolicited data" 334 " while InitialR2T=Yes, protocol error.\n"); 335 transport_send_check_condition_and_sense(se_cmd, 336 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 337 return -1; 338 } 339 340 if ((cmd->first_burst_len + payload_length) > 341 conn->sess->sess_ops->FirstBurstLength) { 342 pr_err("Total %u bytes exceeds FirstBurstLength: %u" 343 " for this Unsolicited DataOut Burst.\n", 344 (cmd->first_burst_len + payload_length), 345 conn->sess->sess_ops->FirstBurstLength); 346 transport_send_check_condition_and_sense(se_cmd, 347 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 348 return -1; 349 } 350 351 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) 352 return 0; 353 354 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) && 355 ((cmd->first_burst_len + payload_length) != 356 conn->sess->sess_ops->FirstBurstLength)) { 357 pr_err("Unsolicited non-immediate data received %u" 358 " does not equal FirstBurstLength: %u, and does" 359 " not equal ExpXferLen %u.\n", 360 (cmd->first_burst_len + payload_length), 361 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length); 362 transport_send_check_condition_and_sense(se_cmd, 363 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 364 return -1; 365 } 366 return 0; 367 } 368 369 struct iscsi_cmd *iscsit_find_cmd_from_itt( 370 struct iscsi_conn *conn, 371 itt_t init_task_tag) 372 { 373 struct iscsi_cmd *cmd; 374 375 spin_lock_bh(&conn->cmd_lock); 376 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 377 if (cmd->init_task_tag == init_task_tag) { 378 spin_unlock_bh(&conn->cmd_lock); 379 return cmd; 380 } 381 } 382 spin_unlock_bh(&conn->cmd_lock); 383 384 pr_err("Unable to locate ITT: 0x%08x on CID: %hu", 385 init_task_tag, conn->cid); 386 return NULL; 387 } 388 389 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump( 390 struct iscsi_conn *conn, 391 itt_t init_task_tag, 392 u32 length) 393 { 394 struct iscsi_cmd *cmd; 395 396 spin_lock_bh(&conn->cmd_lock); 397 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 398 if (cmd->init_task_tag == init_task_tag) { 399 spin_unlock_bh(&conn->cmd_lock); 400 return cmd; 401 } 402 } 403 spin_unlock_bh(&conn->cmd_lock); 404 405 pr_err("Unable to locate ITT: 0x%08x on CID: %hu," 406 " dumping payload\n", init_task_tag, conn->cid); 407 if (length) 408 iscsit_dump_data_payload(conn, length, 1); 409 410 return NULL; 411 } 412 413 struct iscsi_cmd *iscsit_find_cmd_from_ttt( 414 struct iscsi_conn *conn, 415 u32 targ_xfer_tag) 416 { 417 struct iscsi_cmd *cmd = NULL; 418 419 spin_lock_bh(&conn->cmd_lock); 420 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 421 if (cmd->targ_xfer_tag == targ_xfer_tag) { 422 spin_unlock_bh(&conn->cmd_lock); 423 return cmd; 424 } 425 } 426 spin_unlock_bh(&conn->cmd_lock); 427 428 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n", 429 targ_xfer_tag, conn->cid); 430 return NULL; 431 } 432 433 int iscsit_find_cmd_for_recovery( 434 struct iscsi_session *sess, 435 struct iscsi_cmd **cmd_ptr, 436 struct iscsi_conn_recovery **cr_ptr, 437 itt_t init_task_tag) 438 { 439 struct iscsi_cmd *cmd = NULL; 440 struct iscsi_conn_recovery *cr; 441 /* 442 * Scan through the inactive connection recovery list's command list. 443 * If init_task_tag matches the command is still alligent. 444 */ 445 spin_lock(&sess->cr_i_lock); 446 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { 447 spin_lock(&cr->conn_recovery_cmd_lock); 448 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 449 if (cmd->init_task_tag == init_task_tag) { 450 spin_unlock(&cr->conn_recovery_cmd_lock); 451 spin_unlock(&sess->cr_i_lock); 452 453 *cr_ptr = cr; 454 *cmd_ptr = cmd; 455 return -2; 456 } 457 } 458 spin_unlock(&cr->conn_recovery_cmd_lock); 459 } 460 spin_unlock(&sess->cr_i_lock); 461 /* 462 * Scan through the active connection recovery list's command list. 463 * If init_task_tag matches the command is ready to be reassigned. 464 */ 465 spin_lock(&sess->cr_a_lock); 466 list_for_each_entry(cr, &sess->cr_active_list, cr_list) { 467 spin_lock(&cr->conn_recovery_cmd_lock); 468 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 469 if (cmd->init_task_tag == init_task_tag) { 470 spin_unlock(&cr->conn_recovery_cmd_lock); 471 spin_unlock(&sess->cr_a_lock); 472 473 *cr_ptr = cr; 474 *cmd_ptr = cmd; 475 return 0; 476 } 477 } 478 spin_unlock(&cr->conn_recovery_cmd_lock); 479 } 480 spin_unlock(&sess->cr_a_lock); 481 482 return -1; 483 } 484 485 void iscsit_add_cmd_to_immediate_queue( 486 struct iscsi_cmd *cmd, 487 struct iscsi_conn *conn, 488 u8 state) 489 { 490 struct iscsi_queue_req *qr; 491 492 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 493 if (!qr) { 494 pr_err("Unable to allocate memory for" 495 " struct iscsi_queue_req\n"); 496 return; 497 } 498 INIT_LIST_HEAD(&qr->qr_list); 499 qr->cmd = cmd; 500 qr->state = state; 501 502 spin_lock_bh(&conn->immed_queue_lock); 503 list_add_tail(&qr->qr_list, &conn->immed_queue_list); 504 atomic_inc(&cmd->immed_queue_count); 505 atomic_set(&conn->check_immediate_queue, 1); 506 spin_unlock_bh(&conn->immed_queue_lock); 507 508 wake_up(&conn->queues_wq); 509 } 510 511 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn) 512 { 513 struct iscsi_queue_req *qr; 514 515 spin_lock_bh(&conn->immed_queue_lock); 516 if (list_empty(&conn->immed_queue_list)) { 517 spin_unlock_bh(&conn->immed_queue_lock); 518 return NULL; 519 } 520 qr = list_first_entry(&conn->immed_queue_list, 521 struct iscsi_queue_req, qr_list); 522 523 list_del(&qr->qr_list); 524 if (qr->cmd) 525 atomic_dec(&qr->cmd->immed_queue_count); 526 spin_unlock_bh(&conn->immed_queue_lock); 527 528 return qr; 529 } 530 531 static void iscsit_remove_cmd_from_immediate_queue( 532 struct iscsi_cmd *cmd, 533 struct iscsi_conn *conn) 534 { 535 struct iscsi_queue_req *qr, *qr_tmp; 536 537 spin_lock_bh(&conn->immed_queue_lock); 538 if (!atomic_read(&cmd->immed_queue_count)) { 539 spin_unlock_bh(&conn->immed_queue_lock); 540 return; 541 } 542 543 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 544 if (qr->cmd != cmd) 545 continue; 546 547 atomic_dec(&qr->cmd->immed_queue_count); 548 list_del(&qr->qr_list); 549 kmem_cache_free(lio_qr_cache, qr); 550 } 551 spin_unlock_bh(&conn->immed_queue_lock); 552 553 if (atomic_read(&cmd->immed_queue_count)) { 554 pr_err("ITT: 0x%08x immed_queue_count: %d\n", 555 cmd->init_task_tag, 556 atomic_read(&cmd->immed_queue_count)); 557 } 558 } 559 560 void iscsit_add_cmd_to_response_queue( 561 struct iscsi_cmd *cmd, 562 struct iscsi_conn *conn, 563 u8 state) 564 { 565 struct iscsi_queue_req *qr; 566 567 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 568 if (!qr) { 569 pr_err("Unable to allocate memory for" 570 " struct iscsi_queue_req\n"); 571 return; 572 } 573 INIT_LIST_HEAD(&qr->qr_list); 574 qr->cmd = cmd; 575 qr->state = state; 576 577 spin_lock_bh(&conn->response_queue_lock); 578 list_add_tail(&qr->qr_list, &conn->response_queue_list); 579 atomic_inc(&cmd->response_queue_count); 580 spin_unlock_bh(&conn->response_queue_lock); 581 582 wake_up(&conn->queues_wq); 583 } 584 585 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn) 586 { 587 struct iscsi_queue_req *qr; 588 589 spin_lock_bh(&conn->response_queue_lock); 590 if (list_empty(&conn->response_queue_list)) { 591 spin_unlock_bh(&conn->response_queue_lock); 592 return NULL; 593 } 594 595 qr = list_first_entry(&conn->response_queue_list, 596 struct iscsi_queue_req, qr_list); 597 598 list_del(&qr->qr_list); 599 if (qr->cmd) 600 atomic_dec(&qr->cmd->response_queue_count); 601 spin_unlock_bh(&conn->response_queue_lock); 602 603 return qr; 604 } 605 606 static void iscsit_remove_cmd_from_response_queue( 607 struct iscsi_cmd *cmd, 608 struct iscsi_conn *conn) 609 { 610 struct iscsi_queue_req *qr, *qr_tmp; 611 612 spin_lock_bh(&conn->response_queue_lock); 613 if (!atomic_read(&cmd->response_queue_count)) { 614 spin_unlock_bh(&conn->response_queue_lock); 615 return; 616 } 617 618 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 619 qr_list) { 620 if (qr->cmd != cmd) 621 continue; 622 623 atomic_dec(&qr->cmd->response_queue_count); 624 list_del(&qr->qr_list); 625 kmem_cache_free(lio_qr_cache, qr); 626 } 627 spin_unlock_bh(&conn->response_queue_lock); 628 629 if (atomic_read(&cmd->response_queue_count)) { 630 pr_err("ITT: 0x%08x response_queue_count: %d\n", 631 cmd->init_task_tag, 632 atomic_read(&cmd->response_queue_count)); 633 } 634 } 635 636 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn) 637 { 638 bool empty; 639 640 spin_lock_bh(&conn->immed_queue_lock); 641 empty = list_empty(&conn->immed_queue_list); 642 spin_unlock_bh(&conn->immed_queue_lock); 643 644 if (!empty) 645 return empty; 646 647 spin_lock_bh(&conn->response_queue_lock); 648 empty = list_empty(&conn->response_queue_list); 649 spin_unlock_bh(&conn->response_queue_lock); 650 651 return empty; 652 } 653 654 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn) 655 { 656 struct iscsi_queue_req *qr, *qr_tmp; 657 658 spin_lock_bh(&conn->immed_queue_lock); 659 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 660 list_del(&qr->qr_list); 661 if (qr->cmd) 662 atomic_dec(&qr->cmd->immed_queue_count); 663 664 kmem_cache_free(lio_qr_cache, qr); 665 } 666 spin_unlock_bh(&conn->immed_queue_lock); 667 668 spin_lock_bh(&conn->response_queue_lock); 669 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 670 qr_list) { 671 list_del(&qr->qr_list); 672 if (qr->cmd) 673 atomic_dec(&qr->cmd->response_queue_count); 674 675 kmem_cache_free(lio_qr_cache, qr); 676 } 677 spin_unlock_bh(&conn->response_queue_lock); 678 } 679 680 void iscsit_release_cmd(struct iscsi_cmd *cmd) 681 { 682 struct iscsi_session *sess; 683 struct se_cmd *se_cmd = &cmd->se_cmd; 684 685 if (cmd->conn) 686 sess = cmd->conn->sess; 687 else 688 sess = cmd->sess; 689 690 BUG_ON(!sess || !sess->se_sess); 691 692 kfree(cmd->buf_ptr); 693 kfree(cmd->pdu_list); 694 kfree(cmd->seq_list); 695 kfree(cmd->tmr_req); 696 kfree(cmd->iov_data); 697 kfree(cmd->text_in_ptr); 698 699 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag); 700 } 701 EXPORT_SYMBOL(iscsit_release_cmd); 702 703 static void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd, 704 bool check_queues) 705 { 706 struct iscsi_conn *conn = cmd->conn; 707 708 if (scsi_cmd) { 709 if (cmd->data_direction == DMA_TO_DEVICE) { 710 iscsit_stop_dataout_timer(cmd); 711 iscsit_free_r2ts_from_list(cmd); 712 } 713 if (cmd->data_direction == DMA_FROM_DEVICE) 714 iscsit_free_all_datain_reqs(cmd); 715 } 716 717 if (conn && check_queues) { 718 iscsit_remove_cmd_from_immediate_queue(cmd, conn); 719 iscsit_remove_cmd_from_response_queue(cmd, conn); 720 } 721 } 722 723 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) 724 { 725 struct se_cmd *se_cmd = NULL; 726 int rc; 727 /* 728 * Determine if a struct se_cmd is associated with 729 * this struct iscsi_cmd. 730 */ 731 switch (cmd->iscsi_opcode) { 732 case ISCSI_OP_SCSI_CMD: 733 se_cmd = &cmd->se_cmd; 734 __iscsit_free_cmd(cmd, true, shutdown); 735 /* 736 * Fallthrough 737 */ 738 case ISCSI_OP_SCSI_TMFUNC: 739 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown); 740 if (!rc && shutdown && se_cmd && se_cmd->se_sess) { 741 __iscsit_free_cmd(cmd, true, shutdown); 742 target_put_sess_cmd(se_cmd->se_sess, se_cmd); 743 } 744 break; 745 case ISCSI_OP_REJECT: 746 /* 747 * Handle special case for REJECT when iscsi_add_reject*() has 748 * overwritten the original iscsi_opcode assignment, and the 749 * associated cmd->se_cmd needs to be released. 750 */ 751 if (cmd->se_cmd.se_tfo != NULL) { 752 se_cmd = &cmd->se_cmd; 753 __iscsit_free_cmd(cmd, true, shutdown); 754 755 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown); 756 if (!rc && shutdown && se_cmd->se_sess) { 757 __iscsit_free_cmd(cmd, true, shutdown); 758 target_put_sess_cmd(se_cmd->se_sess, se_cmd); 759 } 760 break; 761 } 762 /* Fall-through */ 763 default: 764 __iscsit_free_cmd(cmd, false, shutdown); 765 iscsit_release_cmd(cmd); 766 break; 767 } 768 } 769 770 int iscsit_check_session_usage_count(struct iscsi_session *sess) 771 { 772 spin_lock_bh(&sess->session_usage_lock); 773 if (sess->session_usage_count != 0) { 774 sess->session_waiting_on_uc = 1; 775 spin_unlock_bh(&sess->session_usage_lock); 776 if (in_interrupt()) 777 return 2; 778 779 wait_for_completion(&sess->session_waiting_on_uc_comp); 780 return 1; 781 } 782 spin_unlock_bh(&sess->session_usage_lock); 783 784 return 0; 785 } 786 787 void iscsit_dec_session_usage_count(struct iscsi_session *sess) 788 { 789 spin_lock_bh(&sess->session_usage_lock); 790 sess->session_usage_count--; 791 792 if (!sess->session_usage_count && sess->session_waiting_on_uc) 793 complete(&sess->session_waiting_on_uc_comp); 794 795 spin_unlock_bh(&sess->session_usage_lock); 796 } 797 798 void iscsit_inc_session_usage_count(struct iscsi_session *sess) 799 { 800 spin_lock_bh(&sess->session_usage_lock); 801 sess->session_usage_count++; 802 spin_unlock_bh(&sess->session_usage_lock); 803 } 804 805 /* 806 * Setup conn->if_marker and conn->of_marker values based upon 807 * the initial marker-less interval. (see iSCSI v19 A.2) 808 */ 809 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn) 810 { 811 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0; 812 /* 813 * IFMarkInt and OFMarkInt are negotiated as 32-bit words. 814 */ 815 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4); 816 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4); 817 818 if (conn->conn_ops->OFMarker) { 819 /* 820 * Account for the first Login Command received not 821 * via iscsi_recv_msg(). 822 */ 823 conn->of_marker += ISCSI_HDR_LEN; 824 if (conn->of_marker <= OFMarkInt) { 825 conn->of_marker = (OFMarkInt - conn->of_marker); 826 } else { 827 login_ofmarker_count = (conn->of_marker / OFMarkInt); 828 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) + 829 (login_ofmarker_count * MARKER_SIZE); 830 conn->of_marker = (next_marker - conn->of_marker); 831 } 832 conn->of_marker_offset = 0; 833 pr_debug("Setting OFMarker value to %u based on Initial" 834 " Markerless Interval.\n", conn->of_marker); 835 } 836 837 if (conn->conn_ops->IFMarker) { 838 if (conn->if_marker <= IFMarkInt) { 839 conn->if_marker = (IFMarkInt - conn->if_marker); 840 } else { 841 login_ifmarker_count = (conn->if_marker / IFMarkInt); 842 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) + 843 (login_ifmarker_count * MARKER_SIZE); 844 conn->if_marker = (next_marker - conn->if_marker); 845 } 846 pr_debug("Setting IFMarker value to %u based on Initial" 847 " Markerless Interval.\n", conn->if_marker); 848 } 849 850 return 0; 851 } 852 853 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid) 854 { 855 struct iscsi_conn *conn; 856 857 spin_lock_bh(&sess->conn_lock); 858 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 859 if ((conn->cid == cid) && 860 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) { 861 iscsit_inc_conn_usage_count(conn); 862 spin_unlock_bh(&sess->conn_lock); 863 return conn; 864 } 865 } 866 spin_unlock_bh(&sess->conn_lock); 867 868 return NULL; 869 } 870 871 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid) 872 { 873 struct iscsi_conn *conn; 874 875 spin_lock_bh(&sess->conn_lock); 876 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 877 if (conn->cid == cid) { 878 iscsit_inc_conn_usage_count(conn); 879 spin_lock(&conn->state_lock); 880 atomic_set(&conn->connection_wait_rcfr, 1); 881 spin_unlock(&conn->state_lock); 882 spin_unlock_bh(&sess->conn_lock); 883 return conn; 884 } 885 } 886 spin_unlock_bh(&sess->conn_lock); 887 888 return NULL; 889 } 890 891 void iscsit_check_conn_usage_count(struct iscsi_conn *conn) 892 { 893 spin_lock_bh(&conn->conn_usage_lock); 894 if (conn->conn_usage_count != 0) { 895 conn->conn_waiting_on_uc = 1; 896 spin_unlock_bh(&conn->conn_usage_lock); 897 898 wait_for_completion(&conn->conn_waiting_on_uc_comp); 899 return; 900 } 901 spin_unlock_bh(&conn->conn_usage_lock); 902 } 903 904 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn) 905 { 906 spin_lock_bh(&conn->conn_usage_lock); 907 conn->conn_usage_count--; 908 909 if (!conn->conn_usage_count && conn->conn_waiting_on_uc) 910 complete(&conn->conn_waiting_on_uc_comp); 911 912 spin_unlock_bh(&conn->conn_usage_lock); 913 } 914 915 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn) 916 { 917 spin_lock_bh(&conn->conn_usage_lock); 918 conn->conn_usage_count++; 919 spin_unlock_bh(&conn->conn_usage_lock); 920 } 921 922 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response) 923 { 924 u8 state; 925 struct iscsi_cmd *cmd; 926 927 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC); 928 if (!cmd) 929 return -1; 930 931 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN; 932 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE : 933 ISTATE_SEND_NOPIN_NO_RESPONSE; 934 cmd->init_task_tag = RESERVED_ITT; 935 spin_lock_bh(&conn->sess->ttt_lock); 936 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ : 937 0xFFFFFFFF; 938 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF)) 939 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 940 spin_unlock_bh(&conn->sess->ttt_lock); 941 942 spin_lock_bh(&conn->cmd_lock); 943 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 944 spin_unlock_bh(&conn->cmd_lock); 945 946 if (want_response) 947 iscsit_start_nopin_response_timer(conn); 948 iscsit_add_cmd_to_immediate_queue(cmd, conn, state); 949 950 return 0; 951 } 952 953 static void iscsit_handle_nopin_response_timeout(unsigned long data) 954 { 955 struct iscsi_conn *conn = (struct iscsi_conn *) data; 956 957 iscsit_inc_conn_usage_count(conn); 958 959 spin_lock_bh(&conn->nopin_timer_lock); 960 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) { 961 spin_unlock_bh(&conn->nopin_timer_lock); 962 iscsit_dec_conn_usage_count(conn); 963 return; 964 } 965 966 pr_debug("Did not receive response to NOPIN on CID: %hu on" 967 " SID: %u, failing connection.\n", conn->cid, 968 conn->sess->sid); 969 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 970 spin_unlock_bh(&conn->nopin_timer_lock); 971 972 { 973 struct iscsi_portal_group *tpg = conn->sess->tpg; 974 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 975 976 if (tiqn) { 977 spin_lock_bh(&tiqn->sess_err_stats.lock); 978 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, 979 conn->sess->sess_ops->InitiatorName); 980 tiqn->sess_err_stats.last_sess_failure_type = 981 ISCSI_SESS_ERR_CXN_TIMEOUT; 982 tiqn->sess_err_stats.cxn_timeout_errors++; 983 conn->sess->conn_timeout_errors++; 984 spin_unlock_bh(&tiqn->sess_err_stats.lock); 985 } 986 } 987 988 iscsit_cause_connection_reinstatement(conn, 0); 989 iscsit_dec_conn_usage_count(conn); 990 } 991 992 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn) 993 { 994 struct iscsi_session *sess = conn->sess; 995 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 996 997 spin_lock_bh(&conn->nopin_timer_lock); 998 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 999 spin_unlock_bh(&conn->nopin_timer_lock); 1000 return; 1001 } 1002 1003 mod_timer(&conn->nopin_response_timer, 1004 (get_jiffies_64() + na->nopin_response_timeout * HZ)); 1005 spin_unlock_bh(&conn->nopin_timer_lock); 1006 } 1007 1008 /* 1009 * Called with conn->nopin_timer_lock held. 1010 */ 1011 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn) 1012 { 1013 struct iscsi_session *sess = conn->sess; 1014 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1015 1016 spin_lock_bh(&conn->nopin_timer_lock); 1017 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) { 1018 spin_unlock_bh(&conn->nopin_timer_lock); 1019 return; 1020 } 1021 1022 init_timer(&conn->nopin_response_timer); 1023 conn->nopin_response_timer.expires = 1024 (get_jiffies_64() + na->nopin_response_timeout * HZ); 1025 conn->nopin_response_timer.data = (unsigned long)conn; 1026 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout; 1027 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; 1028 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; 1029 add_timer(&conn->nopin_response_timer); 1030 1031 pr_debug("Started NOPIN Response Timer on CID: %d to %u" 1032 " seconds\n", conn->cid, na->nopin_response_timeout); 1033 spin_unlock_bh(&conn->nopin_timer_lock); 1034 } 1035 1036 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn) 1037 { 1038 spin_lock_bh(&conn->nopin_timer_lock); 1039 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 1040 spin_unlock_bh(&conn->nopin_timer_lock); 1041 return; 1042 } 1043 conn->nopin_response_timer_flags |= ISCSI_TF_STOP; 1044 spin_unlock_bh(&conn->nopin_timer_lock); 1045 1046 del_timer_sync(&conn->nopin_response_timer); 1047 1048 spin_lock_bh(&conn->nopin_timer_lock); 1049 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 1050 spin_unlock_bh(&conn->nopin_timer_lock); 1051 } 1052 1053 static void iscsit_handle_nopin_timeout(unsigned long data) 1054 { 1055 struct iscsi_conn *conn = (struct iscsi_conn *) data; 1056 1057 iscsit_inc_conn_usage_count(conn); 1058 1059 spin_lock_bh(&conn->nopin_timer_lock); 1060 if (conn->nopin_timer_flags & ISCSI_TF_STOP) { 1061 spin_unlock_bh(&conn->nopin_timer_lock); 1062 iscsit_dec_conn_usage_count(conn); 1063 return; 1064 } 1065 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1066 spin_unlock_bh(&conn->nopin_timer_lock); 1067 1068 iscsit_add_nopin(conn, 1); 1069 iscsit_dec_conn_usage_count(conn); 1070 } 1071 1072 /* 1073 * Called with conn->nopin_timer_lock held. 1074 */ 1075 void __iscsit_start_nopin_timer(struct iscsi_conn *conn) 1076 { 1077 struct iscsi_session *sess = conn->sess; 1078 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1079 /* 1080 * NOPIN timeout is disabled. 1081 */ 1082 if (!na->nopin_timeout) 1083 return; 1084 1085 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) 1086 return; 1087 1088 init_timer(&conn->nopin_timer); 1089 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1090 conn->nopin_timer.data = (unsigned long)conn; 1091 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1092 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1093 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1094 add_timer(&conn->nopin_timer); 1095 1096 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1097 " interval\n", conn->cid, na->nopin_timeout); 1098 } 1099 1100 void iscsit_start_nopin_timer(struct iscsi_conn *conn) 1101 { 1102 struct iscsi_session *sess = conn->sess; 1103 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1104 /* 1105 * NOPIN timeout is disabled.. 1106 */ 1107 if (!na->nopin_timeout) 1108 return; 1109 1110 spin_lock_bh(&conn->nopin_timer_lock); 1111 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) { 1112 spin_unlock_bh(&conn->nopin_timer_lock); 1113 return; 1114 } 1115 1116 init_timer(&conn->nopin_timer); 1117 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1118 conn->nopin_timer.data = (unsigned long)conn; 1119 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1120 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1121 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1122 add_timer(&conn->nopin_timer); 1123 1124 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1125 " interval\n", conn->cid, na->nopin_timeout); 1126 spin_unlock_bh(&conn->nopin_timer_lock); 1127 } 1128 1129 void iscsit_stop_nopin_timer(struct iscsi_conn *conn) 1130 { 1131 spin_lock_bh(&conn->nopin_timer_lock); 1132 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) { 1133 spin_unlock_bh(&conn->nopin_timer_lock); 1134 return; 1135 } 1136 conn->nopin_timer_flags |= ISCSI_TF_STOP; 1137 spin_unlock_bh(&conn->nopin_timer_lock); 1138 1139 del_timer_sync(&conn->nopin_timer); 1140 1141 spin_lock_bh(&conn->nopin_timer_lock); 1142 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1143 spin_unlock_bh(&conn->nopin_timer_lock); 1144 } 1145 1146 int iscsit_send_tx_data( 1147 struct iscsi_cmd *cmd, 1148 struct iscsi_conn *conn, 1149 int use_misc) 1150 { 1151 int tx_sent, tx_size; 1152 u32 iov_count; 1153 struct kvec *iov; 1154 1155 send_data: 1156 tx_size = cmd->tx_size; 1157 1158 if (!use_misc) { 1159 iov = &cmd->iov_data[0]; 1160 iov_count = cmd->iov_data_count; 1161 } else { 1162 iov = &cmd->iov_misc[0]; 1163 iov_count = cmd->iov_misc_count; 1164 } 1165 1166 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size); 1167 if (tx_size != tx_sent) { 1168 if (tx_sent == -EAGAIN) { 1169 pr_err("tx_data() returned -EAGAIN\n"); 1170 goto send_data; 1171 } else 1172 return -1; 1173 } 1174 cmd->tx_size = 0; 1175 1176 return 0; 1177 } 1178 1179 int iscsit_fe_sendpage_sg( 1180 struct iscsi_cmd *cmd, 1181 struct iscsi_conn *conn) 1182 { 1183 struct scatterlist *sg = cmd->first_data_sg; 1184 struct kvec iov; 1185 u32 tx_hdr_size, data_len; 1186 u32 offset = cmd->first_data_sg_off; 1187 int tx_sent, iov_off; 1188 1189 send_hdr: 1190 tx_hdr_size = ISCSI_HDR_LEN; 1191 if (conn->conn_ops->HeaderDigest) 1192 tx_hdr_size += ISCSI_CRC_LEN; 1193 1194 iov.iov_base = cmd->pdu; 1195 iov.iov_len = tx_hdr_size; 1196 1197 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size); 1198 if (tx_hdr_size != tx_sent) { 1199 if (tx_sent == -EAGAIN) { 1200 pr_err("tx_data() returned -EAGAIN\n"); 1201 goto send_hdr; 1202 } 1203 return -1; 1204 } 1205 1206 data_len = cmd->tx_size - tx_hdr_size - cmd->padding; 1207 /* 1208 * Set iov_off used by padding and data digest tx_data() calls below 1209 * in order to determine proper offset into cmd->iov_data[] 1210 */ 1211 if (conn->conn_ops->DataDigest) { 1212 data_len -= ISCSI_CRC_LEN; 1213 if (cmd->padding) 1214 iov_off = (cmd->iov_data_count - 2); 1215 else 1216 iov_off = (cmd->iov_data_count - 1); 1217 } else { 1218 iov_off = (cmd->iov_data_count - 1); 1219 } 1220 /* 1221 * Perform sendpage() for each page in the scatterlist 1222 */ 1223 while (data_len) { 1224 u32 space = (sg->length - offset); 1225 u32 sub_len = min_t(u32, data_len, space); 1226 send_pg: 1227 tx_sent = conn->sock->ops->sendpage(conn->sock, 1228 sg_page(sg), sg->offset + offset, sub_len, 0); 1229 if (tx_sent != sub_len) { 1230 if (tx_sent == -EAGAIN) { 1231 pr_err("tcp_sendpage() returned" 1232 " -EAGAIN\n"); 1233 goto send_pg; 1234 } 1235 1236 pr_err("tcp_sendpage() failure: %d\n", 1237 tx_sent); 1238 return -1; 1239 } 1240 1241 data_len -= sub_len; 1242 offset = 0; 1243 sg = sg_next(sg); 1244 } 1245 1246 send_padding: 1247 if (cmd->padding) { 1248 struct kvec *iov_p = &cmd->iov_data[iov_off++]; 1249 1250 tx_sent = tx_data(conn, iov_p, 1, cmd->padding); 1251 if (cmd->padding != tx_sent) { 1252 if (tx_sent == -EAGAIN) { 1253 pr_err("tx_data() returned -EAGAIN\n"); 1254 goto send_padding; 1255 } 1256 return -1; 1257 } 1258 } 1259 1260 send_datacrc: 1261 if (conn->conn_ops->DataDigest) { 1262 struct kvec *iov_d = &cmd->iov_data[iov_off]; 1263 1264 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN); 1265 if (ISCSI_CRC_LEN != tx_sent) { 1266 if (tx_sent == -EAGAIN) { 1267 pr_err("tx_data() returned -EAGAIN\n"); 1268 goto send_datacrc; 1269 } 1270 return -1; 1271 } 1272 } 1273 1274 return 0; 1275 } 1276 1277 /* 1278 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU 1279 * back to the Initiator when an expection condition occurs with the 1280 * errors set in status_class and status_detail. 1281 * 1282 * Parameters: iSCSI Connection, Status Class, Status Detail. 1283 * Returns: 0 on success, -1 on error. 1284 */ 1285 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail) 1286 { 1287 struct iscsi_login_rsp *hdr; 1288 struct iscsi_login *login = conn->conn_login; 1289 1290 login->login_failed = 1; 1291 iscsit_collect_login_stats(conn, status_class, status_detail); 1292 1293 hdr = (struct iscsi_login_rsp *)&login->rsp[0]; 1294 hdr->opcode = ISCSI_OP_LOGIN_RSP; 1295 hdr->status_class = status_class; 1296 hdr->status_detail = status_detail; 1297 hdr->itt = conn->login_itt; 1298 1299 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0); 1300 } 1301 1302 void iscsit_print_session_params(struct iscsi_session *sess) 1303 { 1304 struct iscsi_conn *conn; 1305 1306 pr_debug("-----------------------------[Session Params for" 1307 " SID: %u]-----------------------------\n", sess->sid); 1308 spin_lock_bh(&sess->conn_lock); 1309 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 1310 iscsi_dump_conn_ops(conn->conn_ops); 1311 spin_unlock_bh(&sess->conn_lock); 1312 1313 iscsi_dump_sess_ops(sess->sess_ops); 1314 } 1315 1316 static int iscsit_do_rx_data( 1317 struct iscsi_conn *conn, 1318 struct iscsi_data_count *count) 1319 { 1320 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len; 1321 struct kvec *iov_p; 1322 struct msghdr msg; 1323 1324 if (!conn || !conn->sock || !conn->conn_ops) 1325 return -1; 1326 1327 memset(&msg, 0, sizeof(struct msghdr)); 1328 1329 iov_p = count->iov; 1330 iov_len = count->iov_count; 1331 1332 while (total_rx < data) { 1333 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len, 1334 (data - total_rx), MSG_WAITALL); 1335 if (rx_loop <= 0) { 1336 pr_debug("rx_loop: %d total_rx: %d\n", 1337 rx_loop, total_rx); 1338 return rx_loop; 1339 } 1340 total_rx += rx_loop; 1341 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n", 1342 rx_loop, total_rx, data); 1343 } 1344 1345 return total_rx; 1346 } 1347 1348 static int iscsit_do_tx_data( 1349 struct iscsi_conn *conn, 1350 struct iscsi_data_count *count) 1351 { 1352 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len; 1353 struct kvec *iov_p; 1354 struct msghdr msg; 1355 1356 if (!conn || !conn->sock || !conn->conn_ops) 1357 return -1; 1358 1359 if (data <= 0) { 1360 pr_err("Data length is: %d\n", data); 1361 return -1; 1362 } 1363 1364 memset(&msg, 0, sizeof(struct msghdr)); 1365 1366 iov_p = count->iov; 1367 iov_len = count->iov_count; 1368 1369 while (total_tx < data) { 1370 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len, 1371 (data - total_tx)); 1372 if (tx_loop <= 0) { 1373 pr_debug("tx_loop: %d total_tx %d\n", 1374 tx_loop, total_tx); 1375 return tx_loop; 1376 } 1377 total_tx += tx_loop; 1378 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n", 1379 tx_loop, total_tx, data); 1380 } 1381 1382 return total_tx; 1383 } 1384 1385 int rx_data( 1386 struct iscsi_conn *conn, 1387 struct kvec *iov, 1388 int iov_count, 1389 int data) 1390 { 1391 struct iscsi_data_count c; 1392 1393 if (!conn || !conn->sock || !conn->conn_ops) 1394 return -1; 1395 1396 memset(&c, 0, sizeof(struct iscsi_data_count)); 1397 c.iov = iov; 1398 c.iov_count = iov_count; 1399 c.data_length = data; 1400 c.type = ISCSI_RX_DATA; 1401 1402 return iscsit_do_rx_data(conn, &c); 1403 } 1404 1405 int tx_data( 1406 struct iscsi_conn *conn, 1407 struct kvec *iov, 1408 int iov_count, 1409 int data) 1410 { 1411 struct iscsi_data_count c; 1412 1413 if (!conn || !conn->sock || !conn->conn_ops) 1414 return -1; 1415 1416 memset(&c, 0, sizeof(struct iscsi_data_count)); 1417 c.iov = iov; 1418 c.iov_count = iov_count; 1419 c.data_length = data; 1420 c.type = ISCSI_TX_DATA; 1421 1422 return iscsit_do_tx_data(conn, &c); 1423 } 1424 1425 void iscsit_collect_login_stats( 1426 struct iscsi_conn *conn, 1427 u8 status_class, 1428 u8 status_detail) 1429 { 1430 struct iscsi_param *intrname = NULL; 1431 struct iscsi_tiqn *tiqn; 1432 struct iscsi_login_stats *ls; 1433 1434 tiqn = iscsit_snmp_get_tiqn(conn); 1435 if (!tiqn) 1436 return; 1437 1438 ls = &tiqn->login_stats; 1439 1440 spin_lock(&ls->lock); 1441 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) && 1442 ((get_jiffies_64() - ls->last_fail_time) < 10)) { 1443 /* We already have the failure info for this login */ 1444 spin_unlock(&ls->lock); 1445 return; 1446 } 1447 1448 if (status_class == ISCSI_STATUS_CLS_SUCCESS) 1449 ls->accepts++; 1450 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) { 1451 ls->redirects++; 1452 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT; 1453 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1454 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) { 1455 ls->authenticate_fails++; 1456 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE; 1457 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1458 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) { 1459 ls->authorize_fails++; 1460 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE; 1461 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1462 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) { 1463 ls->negotiate_fails++; 1464 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE; 1465 } else { 1466 ls->other_fails++; 1467 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER; 1468 } 1469 1470 /* Save initiator name, ip address and time, if it is a failed login */ 1471 if (status_class != ISCSI_STATUS_CLS_SUCCESS) { 1472 if (conn->param_list) 1473 intrname = iscsi_find_param_from_key(INITIATORNAME, 1474 conn->param_list); 1475 strcpy(ls->last_intr_fail_name, 1476 (intrname ? intrname->value : "Unknown")); 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