1 /******************************************************************************* 2 * This file contains the iSCSI Target specific utility functions. 3 * 4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. 5 * 6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2. 7 * 8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 ******************************************************************************/ 20 21 #include <linux/list.h> 22 #include <scsi/scsi_tcq.h> 23 #include <scsi/iscsi_proto.h> 24 #include <target/target_core_base.h> 25 #include <target/target_core_fabric.h> 26 #include <target/target_core_configfs.h> 27 28 #include "iscsi_target_core.h" 29 #include "iscsi_target_parameters.h" 30 #include "iscsi_target_seq_pdu_list.h" 31 #include "iscsi_target_datain_values.h" 32 #include "iscsi_target_erl0.h" 33 #include "iscsi_target_erl1.h" 34 #include "iscsi_target_erl2.h" 35 #include "iscsi_target_tpg.h" 36 #include "iscsi_target_tq.h" 37 #include "iscsi_target_util.h" 38 #include "iscsi_target.h" 39 40 #define PRINT_BUFF(buff, len) \ 41 { \ 42 int zzz; \ 43 \ 44 pr_debug("%d:\n", __LINE__); \ 45 for (zzz = 0; zzz < len; zzz++) { \ 46 if (zzz % 16 == 0) { \ 47 if (zzz) \ 48 pr_debug("\n"); \ 49 pr_debug("%4i: ", zzz); \ 50 } \ 51 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \ 52 } \ 53 if ((len + 1) % 16) \ 54 pr_debug("\n"); \ 55 } 56 57 extern struct list_head g_tiqn_list; 58 extern spinlock_t tiqn_lock; 59 60 /* 61 * Called with cmd->r2t_lock held. 62 */ 63 int iscsit_add_r2t_to_list( 64 struct iscsi_cmd *cmd, 65 u32 offset, 66 u32 xfer_len, 67 int recovery, 68 u32 r2t_sn) 69 { 70 struct iscsi_r2t *r2t; 71 72 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC); 73 if (!r2t) { 74 pr_err("Unable to allocate memory for struct iscsi_r2t.\n"); 75 return -1; 76 } 77 INIT_LIST_HEAD(&r2t->r2t_list); 78 79 r2t->recovery_r2t = recovery; 80 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn; 81 r2t->offset = offset; 82 r2t->xfer_len = xfer_len; 83 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list); 84 spin_unlock_bh(&cmd->r2t_lock); 85 86 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); 87 88 spin_lock_bh(&cmd->r2t_lock); 89 return 0; 90 } 91 92 struct iscsi_r2t *iscsit_get_r2t_for_eos( 93 struct iscsi_cmd *cmd, 94 u32 offset, 95 u32 length) 96 { 97 struct iscsi_r2t *r2t; 98 99 spin_lock_bh(&cmd->r2t_lock); 100 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 101 if ((r2t->offset <= offset) && 102 (r2t->offset + r2t->xfer_len) >= (offset + length)) { 103 spin_unlock_bh(&cmd->r2t_lock); 104 return r2t; 105 } 106 } 107 spin_unlock_bh(&cmd->r2t_lock); 108 109 pr_err("Unable to locate R2T for Offset: %u, Length:" 110 " %u\n", offset, length); 111 return NULL; 112 } 113 114 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd) 115 { 116 struct iscsi_r2t *r2t; 117 118 spin_lock_bh(&cmd->r2t_lock); 119 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 120 if (!r2t->sent_r2t) { 121 spin_unlock_bh(&cmd->r2t_lock); 122 return r2t; 123 } 124 } 125 spin_unlock_bh(&cmd->r2t_lock); 126 127 pr_err("Unable to locate next R2T to send for ITT:" 128 " 0x%08x.\n", cmd->init_task_tag); 129 return NULL; 130 } 131 132 /* 133 * Called with cmd->r2t_lock held. 134 */ 135 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd) 136 { 137 list_del(&r2t->r2t_list); 138 kmem_cache_free(lio_r2t_cache, r2t); 139 } 140 141 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd) 142 { 143 struct iscsi_r2t *r2t, *r2t_tmp; 144 145 spin_lock_bh(&cmd->r2t_lock); 146 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) 147 iscsit_free_r2t(r2t, cmd); 148 spin_unlock_bh(&cmd->r2t_lock); 149 } 150 151 /* 152 * May be called from software interrupt (timer) context for allocating 153 * iSCSI NopINs. 154 */ 155 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask) 156 { 157 struct iscsi_cmd *cmd; 158 159 cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask); 160 if (!cmd) { 161 pr_err("Unable to allocate memory for struct iscsi_cmd.\n"); 162 return NULL; 163 } 164 165 cmd->conn = conn; 166 INIT_LIST_HEAD(&cmd->i_conn_node); 167 INIT_LIST_HEAD(&cmd->datain_list); 168 INIT_LIST_HEAD(&cmd->cmd_r2t_list); 169 init_completion(&cmd->reject_comp); 170 spin_lock_init(&cmd->datain_lock); 171 spin_lock_init(&cmd->dataout_timeout_lock); 172 spin_lock_init(&cmd->istate_lock); 173 spin_lock_init(&cmd->error_lock); 174 spin_lock_init(&cmd->r2t_lock); 175 176 return cmd; 177 } 178 179 struct iscsi_seq *iscsit_get_seq_holder_for_datain( 180 struct iscsi_cmd *cmd, 181 u32 seq_send_order) 182 { 183 u32 i; 184 185 for (i = 0; i < cmd->seq_count; i++) 186 if (cmd->seq_list[i].seq_send_order == seq_send_order) 187 return &cmd->seq_list[i]; 188 189 return NULL; 190 } 191 192 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd) 193 { 194 u32 i; 195 196 if (!cmd->seq_list) { 197 pr_err("struct iscsi_cmd->seq_list is NULL!\n"); 198 return NULL; 199 } 200 201 for (i = 0; i < cmd->seq_count; i++) { 202 if (cmd->seq_list[i].type != SEQTYPE_NORMAL) 203 continue; 204 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) { 205 cmd->seq_send_order++; 206 return &cmd->seq_list[i]; 207 } 208 } 209 210 return NULL; 211 } 212 213 struct iscsi_r2t *iscsit_get_holder_for_r2tsn( 214 struct iscsi_cmd *cmd, 215 u32 r2t_sn) 216 { 217 struct iscsi_r2t *r2t; 218 219 spin_lock_bh(&cmd->r2t_lock); 220 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 221 if (r2t->r2t_sn == r2t_sn) { 222 spin_unlock_bh(&cmd->r2t_lock); 223 return r2t; 224 } 225 } 226 spin_unlock_bh(&cmd->r2t_lock); 227 228 return NULL; 229 } 230 231 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn) 232 { 233 int ret; 234 235 /* 236 * This is the proper method of checking received CmdSN against 237 * ExpCmdSN and MaxCmdSN values, as well as accounting for out 238 * or order CmdSNs due to multiple connection sessions and/or 239 * CRC failures. 240 */ 241 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) { 242 pr_err("Received CmdSN: 0x%08x is greater than" 243 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn, 244 sess->max_cmd_sn); 245 ret = CMDSN_ERROR_CANNOT_RECOVER; 246 247 } else if (cmdsn == sess->exp_cmd_sn) { 248 sess->exp_cmd_sn++; 249 pr_debug("Received CmdSN matches ExpCmdSN," 250 " incremented ExpCmdSN to: 0x%08x\n", 251 sess->exp_cmd_sn); 252 ret = CMDSN_NORMAL_OPERATION; 253 254 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) { 255 pr_debug("Received CmdSN: 0x%08x is greater" 256 " than ExpCmdSN: 0x%08x, not acknowledging.\n", 257 cmdsn, sess->exp_cmd_sn); 258 ret = CMDSN_HIGHER_THAN_EXP; 259 260 } else { 261 pr_err("Received CmdSN: 0x%08x is less than" 262 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn, 263 sess->exp_cmd_sn); 264 ret = CMDSN_LOWER_THAN_EXP; 265 } 266 267 return ret; 268 } 269 270 /* 271 * Commands may be received out of order if MC/S is in use. 272 * Ensure they are executed in CmdSN order. 273 */ 274 int iscsit_sequence_cmd( 275 struct iscsi_conn *conn, 276 struct iscsi_cmd *cmd, 277 u32 cmdsn) 278 { 279 int ret; 280 int cmdsn_ret; 281 282 mutex_lock(&conn->sess->cmdsn_mutex); 283 284 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, cmdsn); 285 switch (cmdsn_ret) { 286 case CMDSN_NORMAL_OPERATION: 287 ret = iscsit_execute_cmd(cmd, 0); 288 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list)) 289 iscsit_execute_ooo_cmdsns(conn->sess); 290 break; 291 case CMDSN_HIGHER_THAN_EXP: 292 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn); 293 break; 294 case CMDSN_LOWER_THAN_EXP: 295 cmd->i_state = ISTATE_REMOVE; 296 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 297 ret = cmdsn_ret; 298 break; 299 default: 300 ret = cmdsn_ret; 301 break; 302 } 303 mutex_unlock(&conn->sess->cmdsn_mutex); 304 305 return ret; 306 } 307 308 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf) 309 { 310 struct iscsi_conn *conn = cmd->conn; 311 struct se_cmd *se_cmd = &cmd->se_cmd; 312 struct iscsi_data *hdr = (struct iscsi_data *) buf; 313 u32 payload_length = ntoh24(hdr->dlength); 314 315 if (conn->sess->sess_ops->InitialR2T) { 316 pr_err("Received unexpected unsolicited data" 317 " while InitialR2T=Yes, protocol error.\n"); 318 transport_send_check_condition_and_sense(se_cmd, 319 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 320 return -1; 321 } 322 323 if ((cmd->first_burst_len + payload_length) > 324 conn->sess->sess_ops->FirstBurstLength) { 325 pr_err("Total %u bytes exceeds FirstBurstLength: %u" 326 " for this Unsolicited DataOut Burst.\n", 327 (cmd->first_burst_len + payload_length), 328 conn->sess->sess_ops->FirstBurstLength); 329 transport_send_check_condition_and_sense(se_cmd, 330 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 331 return -1; 332 } 333 334 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) 335 return 0; 336 337 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) && 338 ((cmd->first_burst_len + payload_length) != 339 conn->sess->sess_ops->FirstBurstLength)) { 340 pr_err("Unsolicited non-immediate data received %u" 341 " does not equal FirstBurstLength: %u, and does" 342 " not equal ExpXferLen %u.\n", 343 (cmd->first_burst_len + payload_length), 344 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length); 345 transport_send_check_condition_and_sense(se_cmd, 346 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 347 return -1; 348 } 349 return 0; 350 } 351 352 struct iscsi_cmd *iscsit_find_cmd_from_itt( 353 struct iscsi_conn *conn, 354 u32 init_task_tag) 355 { 356 struct iscsi_cmd *cmd; 357 358 spin_lock_bh(&conn->cmd_lock); 359 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 360 if (cmd->init_task_tag == init_task_tag) { 361 spin_unlock_bh(&conn->cmd_lock); 362 return cmd; 363 } 364 } 365 spin_unlock_bh(&conn->cmd_lock); 366 367 pr_err("Unable to locate ITT: 0x%08x on CID: %hu", 368 init_task_tag, conn->cid); 369 return NULL; 370 } 371 372 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump( 373 struct iscsi_conn *conn, 374 u32 init_task_tag, 375 u32 length) 376 { 377 struct iscsi_cmd *cmd; 378 379 spin_lock_bh(&conn->cmd_lock); 380 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 381 if (cmd->init_task_tag == init_task_tag) { 382 spin_unlock_bh(&conn->cmd_lock); 383 return cmd; 384 } 385 } 386 spin_unlock_bh(&conn->cmd_lock); 387 388 pr_err("Unable to locate ITT: 0x%08x on CID: %hu," 389 " dumping payload\n", init_task_tag, conn->cid); 390 if (length) 391 iscsit_dump_data_payload(conn, length, 1); 392 393 return NULL; 394 } 395 396 struct iscsi_cmd *iscsit_find_cmd_from_ttt( 397 struct iscsi_conn *conn, 398 u32 targ_xfer_tag) 399 { 400 struct iscsi_cmd *cmd = NULL; 401 402 spin_lock_bh(&conn->cmd_lock); 403 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 404 if (cmd->targ_xfer_tag == targ_xfer_tag) { 405 spin_unlock_bh(&conn->cmd_lock); 406 return cmd; 407 } 408 } 409 spin_unlock_bh(&conn->cmd_lock); 410 411 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n", 412 targ_xfer_tag, conn->cid); 413 return NULL; 414 } 415 416 int iscsit_find_cmd_for_recovery( 417 struct iscsi_session *sess, 418 struct iscsi_cmd **cmd_ptr, 419 struct iscsi_conn_recovery **cr_ptr, 420 u32 init_task_tag) 421 { 422 struct iscsi_cmd *cmd = NULL; 423 struct iscsi_conn_recovery *cr; 424 /* 425 * Scan through the inactive connection recovery list's command list. 426 * If init_task_tag matches the command is still alligent. 427 */ 428 spin_lock(&sess->cr_i_lock); 429 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { 430 spin_lock(&cr->conn_recovery_cmd_lock); 431 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 432 if (cmd->init_task_tag == init_task_tag) { 433 spin_unlock(&cr->conn_recovery_cmd_lock); 434 spin_unlock(&sess->cr_i_lock); 435 436 *cr_ptr = cr; 437 *cmd_ptr = cmd; 438 return -2; 439 } 440 } 441 spin_unlock(&cr->conn_recovery_cmd_lock); 442 } 443 spin_unlock(&sess->cr_i_lock); 444 /* 445 * Scan through the active connection recovery list's command list. 446 * If init_task_tag matches the command is ready to be reassigned. 447 */ 448 spin_lock(&sess->cr_a_lock); 449 list_for_each_entry(cr, &sess->cr_active_list, cr_list) { 450 spin_lock(&cr->conn_recovery_cmd_lock); 451 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 452 if (cmd->init_task_tag == init_task_tag) { 453 spin_unlock(&cr->conn_recovery_cmd_lock); 454 spin_unlock(&sess->cr_a_lock); 455 456 *cr_ptr = cr; 457 *cmd_ptr = cmd; 458 return 0; 459 } 460 } 461 spin_unlock(&cr->conn_recovery_cmd_lock); 462 } 463 spin_unlock(&sess->cr_a_lock); 464 465 return -1; 466 } 467 468 void iscsit_add_cmd_to_immediate_queue( 469 struct iscsi_cmd *cmd, 470 struct iscsi_conn *conn, 471 u8 state) 472 { 473 struct iscsi_queue_req *qr; 474 475 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 476 if (!qr) { 477 pr_err("Unable to allocate memory for" 478 " struct iscsi_queue_req\n"); 479 return; 480 } 481 INIT_LIST_HEAD(&qr->qr_list); 482 qr->cmd = cmd; 483 qr->state = state; 484 485 spin_lock_bh(&conn->immed_queue_lock); 486 list_add_tail(&qr->qr_list, &conn->immed_queue_list); 487 atomic_inc(&cmd->immed_queue_count); 488 atomic_set(&conn->check_immediate_queue, 1); 489 spin_unlock_bh(&conn->immed_queue_lock); 490 491 wake_up_process(conn->thread_set->tx_thread); 492 } 493 494 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn) 495 { 496 struct iscsi_queue_req *qr; 497 498 spin_lock_bh(&conn->immed_queue_lock); 499 if (list_empty(&conn->immed_queue_list)) { 500 spin_unlock_bh(&conn->immed_queue_lock); 501 return NULL; 502 } 503 list_for_each_entry(qr, &conn->immed_queue_list, qr_list) 504 break; 505 506 list_del(&qr->qr_list); 507 if (qr->cmd) 508 atomic_dec(&qr->cmd->immed_queue_count); 509 spin_unlock_bh(&conn->immed_queue_lock); 510 511 return qr; 512 } 513 514 static void iscsit_remove_cmd_from_immediate_queue( 515 struct iscsi_cmd *cmd, 516 struct iscsi_conn *conn) 517 { 518 struct iscsi_queue_req *qr, *qr_tmp; 519 520 spin_lock_bh(&conn->immed_queue_lock); 521 if (!atomic_read(&cmd->immed_queue_count)) { 522 spin_unlock_bh(&conn->immed_queue_lock); 523 return; 524 } 525 526 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 527 if (qr->cmd != cmd) 528 continue; 529 530 atomic_dec(&qr->cmd->immed_queue_count); 531 list_del(&qr->qr_list); 532 kmem_cache_free(lio_qr_cache, qr); 533 } 534 spin_unlock_bh(&conn->immed_queue_lock); 535 536 if (atomic_read(&cmd->immed_queue_count)) { 537 pr_err("ITT: 0x%08x immed_queue_count: %d\n", 538 cmd->init_task_tag, 539 atomic_read(&cmd->immed_queue_count)); 540 } 541 } 542 543 void iscsit_add_cmd_to_response_queue( 544 struct iscsi_cmd *cmd, 545 struct iscsi_conn *conn, 546 u8 state) 547 { 548 struct iscsi_queue_req *qr; 549 550 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 551 if (!qr) { 552 pr_err("Unable to allocate memory for" 553 " struct iscsi_queue_req\n"); 554 return; 555 } 556 INIT_LIST_HEAD(&qr->qr_list); 557 qr->cmd = cmd; 558 qr->state = state; 559 560 spin_lock_bh(&conn->response_queue_lock); 561 list_add_tail(&qr->qr_list, &conn->response_queue_list); 562 atomic_inc(&cmd->response_queue_count); 563 spin_unlock_bh(&conn->response_queue_lock); 564 565 wake_up_process(conn->thread_set->tx_thread); 566 } 567 568 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn) 569 { 570 struct iscsi_queue_req *qr; 571 572 spin_lock_bh(&conn->response_queue_lock); 573 if (list_empty(&conn->response_queue_list)) { 574 spin_unlock_bh(&conn->response_queue_lock); 575 return NULL; 576 } 577 578 list_for_each_entry(qr, &conn->response_queue_list, qr_list) 579 break; 580 581 list_del(&qr->qr_list); 582 if (qr->cmd) 583 atomic_dec(&qr->cmd->response_queue_count); 584 spin_unlock_bh(&conn->response_queue_lock); 585 586 return qr; 587 } 588 589 static void iscsit_remove_cmd_from_response_queue( 590 struct iscsi_cmd *cmd, 591 struct iscsi_conn *conn) 592 { 593 struct iscsi_queue_req *qr, *qr_tmp; 594 595 spin_lock_bh(&conn->response_queue_lock); 596 if (!atomic_read(&cmd->response_queue_count)) { 597 spin_unlock_bh(&conn->response_queue_lock); 598 return; 599 } 600 601 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 602 qr_list) { 603 if (qr->cmd != cmd) 604 continue; 605 606 atomic_dec(&qr->cmd->response_queue_count); 607 list_del(&qr->qr_list); 608 kmem_cache_free(lio_qr_cache, qr); 609 } 610 spin_unlock_bh(&conn->response_queue_lock); 611 612 if (atomic_read(&cmd->response_queue_count)) { 613 pr_err("ITT: 0x%08x response_queue_count: %d\n", 614 cmd->init_task_tag, 615 atomic_read(&cmd->response_queue_count)); 616 } 617 } 618 619 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn) 620 { 621 struct iscsi_queue_req *qr, *qr_tmp; 622 623 spin_lock_bh(&conn->immed_queue_lock); 624 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 625 list_del(&qr->qr_list); 626 if (qr->cmd) 627 atomic_dec(&qr->cmd->immed_queue_count); 628 629 kmem_cache_free(lio_qr_cache, qr); 630 } 631 spin_unlock_bh(&conn->immed_queue_lock); 632 633 spin_lock_bh(&conn->response_queue_lock); 634 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 635 qr_list) { 636 list_del(&qr->qr_list); 637 if (qr->cmd) 638 atomic_dec(&qr->cmd->response_queue_count); 639 640 kmem_cache_free(lio_qr_cache, qr); 641 } 642 spin_unlock_bh(&conn->response_queue_lock); 643 } 644 645 void iscsit_release_cmd(struct iscsi_cmd *cmd) 646 { 647 struct iscsi_conn *conn = cmd->conn; 648 649 iscsit_free_r2ts_from_list(cmd); 650 iscsit_free_all_datain_reqs(cmd); 651 652 kfree(cmd->buf_ptr); 653 kfree(cmd->pdu_list); 654 kfree(cmd->seq_list); 655 kfree(cmd->tmr_req); 656 kfree(cmd->iov_data); 657 658 if (conn) { 659 iscsit_remove_cmd_from_immediate_queue(cmd, conn); 660 iscsit_remove_cmd_from_response_queue(cmd, conn); 661 } 662 663 kmem_cache_free(lio_cmd_cache, cmd); 664 } 665 666 void iscsit_free_cmd(struct iscsi_cmd *cmd) 667 { 668 /* 669 * Determine if a struct se_cmd is assoicated with 670 * this struct iscsi_cmd. 671 */ 672 switch (cmd->iscsi_opcode) { 673 case ISCSI_OP_SCSI_CMD: 674 case ISCSI_OP_SCSI_TMFUNC: 675 transport_generic_free_cmd(&cmd->se_cmd, 1); 676 break; 677 case ISCSI_OP_REJECT: 678 /* 679 * Handle special case for REJECT when iscsi_add_reject*() has 680 * overwritten the original iscsi_opcode assignment, and the 681 * associated cmd->se_cmd needs to be released. 682 */ 683 if (cmd->se_cmd.se_tfo != NULL) { 684 transport_generic_free_cmd(&cmd->se_cmd, 1); 685 break; 686 } 687 /* Fall-through */ 688 default: 689 iscsit_release_cmd(cmd); 690 break; 691 } 692 } 693 694 int iscsit_check_session_usage_count(struct iscsi_session *sess) 695 { 696 spin_lock_bh(&sess->session_usage_lock); 697 if (sess->session_usage_count != 0) { 698 sess->session_waiting_on_uc = 1; 699 spin_unlock_bh(&sess->session_usage_lock); 700 if (in_interrupt()) 701 return 2; 702 703 wait_for_completion(&sess->session_waiting_on_uc_comp); 704 return 1; 705 } 706 spin_unlock_bh(&sess->session_usage_lock); 707 708 return 0; 709 } 710 711 void iscsit_dec_session_usage_count(struct iscsi_session *sess) 712 { 713 spin_lock_bh(&sess->session_usage_lock); 714 sess->session_usage_count--; 715 716 if (!sess->session_usage_count && sess->session_waiting_on_uc) 717 complete(&sess->session_waiting_on_uc_comp); 718 719 spin_unlock_bh(&sess->session_usage_lock); 720 } 721 722 void iscsit_inc_session_usage_count(struct iscsi_session *sess) 723 { 724 spin_lock_bh(&sess->session_usage_lock); 725 sess->session_usage_count++; 726 spin_unlock_bh(&sess->session_usage_lock); 727 } 728 729 /* 730 * Setup conn->if_marker and conn->of_marker values based upon 731 * the initial marker-less interval. (see iSCSI v19 A.2) 732 */ 733 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn) 734 { 735 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0; 736 /* 737 * IFMarkInt and OFMarkInt are negotiated as 32-bit words. 738 */ 739 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4); 740 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4); 741 742 if (conn->conn_ops->OFMarker) { 743 /* 744 * Account for the first Login Command received not 745 * via iscsi_recv_msg(). 746 */ 747 conn->of_marker += ISCSI_HDR_LEN; 748 if (conn->of_marker <= OFMarkInt) { 749 conn->of_marker = (OFMarkInt - conn->of_marker); 750 } else { 751 login_ofmarker_count = (conn->of_marker / OFMarkInt); 752 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) + 753 (login_ofmarker_count * MARKER_SIZE); 754 conn->of_marker = (next_marker - conn->of_marker); 755 } 756 conn->of_marker_offset = 0; 757 pr_debug("Setting OFMarker value to %u based on Initial" 758 " Markerless Interval.\n", conn->of_marker); 759 } 760 761 if (conn->conn_ops->IFMarker) { 762 if (conn->if_marker <= IFMarkInt) { 763 conn->if_marker = (IFMarkInt - conn->if_marker); 764 } else { 765 login_ifmarker_count = (conn->if_marker / IFMarkInt); 766 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) + 767 (login_ifmarker_count * MARKER_SIZE); 768 conn->if_marker = (next_marker - conn->if_marker); 769 } 770 pr_debug("Setting IFMarker value to %u based on Initial" 771 " Markerless Interval.\n", conn->if_marker); 772 } 773 774 return 0; 775 } 776 777 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid) 778 { 779 struct iscsi_conn *conn; 780 781 spin_lock_bh(&sess->conn_lock); 782 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 783 if ((conn->cid == cid) && 784 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) { 785 iscsit_inc_conn_usage_count(conn); 786 spin_unlock_bh(&sess->conn_lock); 787 return conn; 788 } 789 } 790 spin_unlock_bh(&sess->conn_lock); 791 792 return NULL; 793 } 794 795 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid) 796 { 797 struct iscsi_conn *conn; 798 799 spin_lock_bh(&sess->conn_lock); 800 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 801 if (conn->cid == cid) { 802 iscsit_inc_conn_usage_count(conn); 803 spin_lock(&conn->state_lock); 804 atomic_set(&conn->connection_wait_rcfr, 1); 805 spin_unlock(&conn->state_lock); 806 spin_unlock_bh(&sess->conn_lock); 807 return conn; 808 } 809 } 810 spin_unlock_bh(&sess->conn_lock); 811 812 return NULL; 813 } 814 815 void iscsit_check_conn_usage_count(struct iscsi_conn *conn) 816 { 817 spin_lock_bh(&conn->conn_usage_lock); 818 if (conn->conn_usage_count != 0) { 819 conn->conn_waiting_on_uc = 1; 820 spin_unlock_bh(&conn->conn_usage_lock); 821 822 wait_for_completion(&conn->conn_waiting_on_uc_comp); 823 return; 824 } 825 spin_unlock_bh(&conn->conn_usage_lock); 826 } 827 828 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn) 829 { 830 spin_lock_bh(&conn->conn_usage_lock); 831 conn->conn_usage_count--; 832 833 if (!conn->conn_usage_count && conn->conn_waiting_on_uc) 834 complete(&conn->conn_waiting_on_uc_comp); 835 836 spin_unlock_bh(&conn->conn_usage_lock); 837 } 838 839 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn) 840 { 841 spin_lock_bh(&conn->conn_usage_lock); 842 conn->conn_usage_count++; 843 spin_unlock_bh(&conn->conn_usage_lock); 844 } 845 846 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response) 847 { 848 u8 state; 849 struct iscsi_cmd *cmd; 850 851 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC); 852 if (!cmd) 853 return -1; 854 855 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN; 856 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE : 857 ISTATE_SEND_NOPIN_NO_RESPONSE; 858 cmd->init_task_tag = 0xFFFFFFFF; 859 spin_lock_bh(&conn->sess->ttt_lock); 860 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ : 861 0xFFFFFFFF; 862 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF)) 863 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 864 spin_unlock_bh(&conn->sess->ttt_lock); 865 866 spin_lock_bh(&conn->cmd_lock); 867 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 868 spin_unlock_bh(&conn->cmd_lock); 869 870 if (want_response) 871 iscsit_start_nopin_response_timer(conn); 872 iscsit_add_cmd_to_immediate_queue(cmd, conn, state); 873 874 return 0; 875 } 876 877 static void iscsit_handle_nopin_response_timeout(unsigned long data) 878 { 879 struct iscsi_conn *conn = (struct iscsi_conn *) data; 880 881 iscsit_inc_conn_usage_count(conn); 882 883 spin_lock_bh(&conn->nopin_timer_lock); 884 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) { 885 spin_unlock_bh(&conn->nopin_timer_lock); 886 iscsit_dec_conn_usage_count(conn); 887 return; 888 } 889 890 pr_debug("Did not receive response to NOPIN on CID: %hu on" 891 " SID: %u, failing connection.\n", conn->cid, 892 conn->sess->sid); 893 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 894 spin_unlock_bh(&conn->nopin_timer_lock); 895 896 { 897 struct iscsi_portal_group *tpg = conn->sess->tpg; 898 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 899 900 if (tiqn) { 901 spin_lock_bh(&tiqn->sess_err_stats.lock); 902 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, 903 conn->sess->sess_ops->InitiatorName); 904 tiqn->sess_err_stats.last_sess_failure_type = 905 ISCSI_SESS_ERR_CXN_TIMEOUT; 906 tiqn->sess_err_stats.cxn_timeout_errors++; 907 conn->sess->conn_timeout_errors++; 908 spin_unlock_bh(&tiqn->sess_err_stats.lock); 909 } 910 } 911 912 iscsit_cause_connection_reinstatement(conn, 0); 913 iscsit_dec_conn_usage_count(conn); 914 } 915 916 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn) 917 { 918 struct iscsi_session *sess = conn->sess; 919 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 920 921 spin_lock_bh(&conn->nopin_timer_lock); 922 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 923 spin_unlock_bh(&conn->nopin_timer_lock); 924 return; 925 } 926 927 mod_timer(&conn->nopin_response_timer, 928 (get_jiffies_64() + na->nopin_response_timeout * HZ)); 929 spin_unlock_bh(&conn->nopin_timer_lock); 930 } 931 932 /* 933 * Called with conn->nopin_timer_lock held. 934 */ 935 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn) 936 { 937 struct iscsi_session *sess = conn->sess; 938 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 939 940 spin_lock_bh(&conn->nopin_timer_lock); 941 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) { 942 spin_unlock_bh(&conn->nopin_timer_lock); 943 return; 944 } 945 946 init_timer(&conn->nopin_response_timer); 947 conn->nopin_response_timer.expires = 948 (get_jiffies_64() + na->nopin_response_timeout * HZ); 949 conn->nopin_response_timer.data = (unsigned long)conn; 950 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout; 951 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; 952 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; 953 add_timer(&conn->nopin_response_timer); 954 955 pr_debug("Started NOPIN Response Timer on CID: %d to %u" 956 " seconds\n", conn->cid, na->nopin_response_timeout); 957 spin_unlock_bh(&conn->nopin_timer_lock); 958 } 959 960 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn) 961 { 962 spin_lock_bh(&conn->nopin_timer_lock); 963 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 964 spin_unlock_bh(&conn->nopin_timer_lock); 965 return; 966 } 967 conn->nopin_response_timer_flags |= ISCSI_TF_STOP; 968 spin_unlock_bh(&conn->nopin_timer_lock); 969 970 del_timer_sync(&conn->nopin_response_timer); 971 972 spin_lock_bh(&conn->nopin_timer_lock); 973 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 974 spin_unlock_bh(&conn->nopin_timer_lock); 975 } 976 977 static void iscsit_handle_nopin_timeout(unsigned long data) 978 { 979 struct iscsi_conn *conn = (struct iscsi_conn *) data; 980 981 iscsit_inc_conn_usage_count(conn); 982 983 spin_lock_bh(&conn->nopin_timer_lock); 984 if (conn->nopin_timer_flags & ISCSI_TF_STOP) { 985 spin_unlock_bh(&conn->nopin_timer_lock); 986 iscsit_dec_conn_usage_count(conn); 987 return; 988 } 989 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 990 spin_unlock_bh(&conn->nopin_timer_lock); 991 992 iscsit_add_nopin(conn, 1); 993 iscsit_dec_conn_usage_count(conn); 994 } 995 996 /* 997 * Called with conn->nopin_timer_lock held. 998 */ 999 void __iscsit_start_nopin_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 * NOPIN timeout is disabled. 1005 */ 1006 if (!na->nopin_timeout) 1007 return; 1008 1009 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) 1010 return; 1011 1012 init_timer(&conn->nopin_timer); 1013 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1014 conn->nopin_timer.data = (unsigned long)conn; 1015 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1016 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1017 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1018 add_timer(&conn->nopin_timer); 1019 1020 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1021 " interval\n", conn->cid, na->nopin_timeout); 1022 } 1023 1024 void iscsit_start_nopin_timer(struct iscsi_conn *conn) 1025 { 1026 struct iscsi_session *sess = conn->sess; 1027 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1028 /* 1029 * NOPIN timeout is disabled.. 1030 */ 1031 if (!na->nopin_timeout) 1032 return; 1033 1034 spin_lock_bh(&conn->nopin_timer_lock); 1035 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) { 1036 spin_unlock_bh(&conn->nopin_timer_lock); 1037 return; 1038 } 1039 1040 init_timer(&conn->nopin_timer); 1041 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1042 conn->nopin_timer.data = (unsigned long)conn; 1043 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1044 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1045 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1046 add_timer(&conn->nopin_timer); 1047 1048 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1049 " interval\n", conn->cid, na->nopin_timeout); 1050 spin_unlock_bh(&conn->nopin_timer_lock); 1051 } 1052 1053 void iscsit_stop_nopin_timer(struct iscsi_conn *conn) 1054 { 1055 spin_lock_bh(&conn->nopin_timer_lock); 1056 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) { 1057 spin_unlock_bh(&conn->nopin_timer_lock); 1058 return; 1059 } 1060 conn->nopin_timer_flags |= ISCSI_TF_STOP; 1061 spin_unlock_bh(&conn->nopin_timer_lock); 1062 1063 del_timer_sync(&conn->nopin_timer); 1064 1065 spin_lock_bh(&conn->nopin_timer_lock); 1066 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1067 spin_unlock_bh(&conn->nopin_timer_lock); 1068 } 1069 1070 int iscsit_send_tx_data( 1071 struct iscsi_cmd *cmd, 1072 struct iscsi_conn *conn, 1073 int use_misc) 1074 { 1075 int tx_sent, tx_size; 1076 u32 iov_count; 1077 struct kvec *iov; 1078 1079 send_data: 1080 tx_size = cmd->tx_size; 1081 1082 if (!use_misc) { 1083 iov = &cmd->iov_data[0]; 1084 iov_count = cmd->iov_data_count; 1085 } else { 1086 iov = &cmd->iov_misc[0]; 1087 iov_count = cmd->iov_misc_count; 1088 } 1089 1090 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size); 1091 if (tx_size != tx_sent) { 1092 if (tx_sent == -EAGAIN) { 1093 pr_err("tx_data() returned -EAGAIN\n"); 1094 goto send_data; 1095 } else 1096 return -1; 1097 } 1098 cmd->tx_size = 0; 1099 1100 return 0; 1101 } 1102 1103 int iscsit_fe_sendpage_sg( 1104 struct iscsi_cmd *cmd, 1105 struct iscsi_conn *conn) 1106 { 1107 struct scatterlist *sg = cmd->first_data_sg; 1108 struct kvec iov; 1109 u32 tx_hdr_size, data_len; 1110 u32 offset = cmd->first_data_sg_off; 1111 int tx_sent, iov_off; 1112 1113 send_hdr: 1114 tx_hdr_size = ISCSI_HDR_LEN; 1115 if (conn->conn_ops->HeaderDigest) 1116 tx_hdr_size += ISCSI_CRC_LEN; 1117 1118 iov.iov_base = cmd->pdu; 1119 iov.iov_len = tx_hdr_size; 1120 1121 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size); 1122 if (tx_hdr_size != tx_sent) { 1123 if (tx_sent == -EAGAIN) { 1124 pr_err("tx_data() returned -EAGAIN\n"); 1125 goto send_hdr; 1126 } 1127 return -1; 1128 } 1129 1130 data_len = cmd->tx_size - tx_hdr_size - cmd->padding; 1131 /* 1132 * Set iov_off used by padding and data digest tx_data() calls below 1133 * in order to determine proper offset into cmd->iov_data[] 1134 */ 1135 if (conn->conn_ops->DataDigest) { 1136 data_len -= ISCSI_CRC_LEN; 1137 if (cmd->padding) 1138 iov_off = (cmd->iov_data_count - 2); 1139 else 1140 iov_off = (cmd->iov_data_count - 1); 1141 } else { 1142 iov_off = (cmd->iov_data_count - 1); 1143 } 1144 /* 1145 * Perform sendpage() for each page in the scatterlist 1146 */ 1147 while (data_len) { 1148 u32 space = (sg->length - offset); 1149 u32 sub_len = min_t(u32, data_len, space); 1150 send_pg: 1151 tx_sent = conn->sock->ops->sendpage(conn->sock, 1152 sg_page(sg), sg->offset + offset, sub_len, 0); 1153 if (tx_sent != sub_len) { 1154 if (tx_sent == -EAGAIN) { 1155 pr_err("tcp_sendpage() returned" 1156 " -EAGAIN\n"); 1157 goto send_pg; 1158 } 1159 1160 pr_err("tcp_sendpage() failure: %d\n", 1161 tx_sent); 1162 return -1; 1163 } 1164 1165 data_len -= sub_len; 1166 offset = 0; 1167 sg = sg_next(sg); 1168 } 1169 1170 send_padding: 1171 if (cmd->padding) { 1172 struct kvec *iov_p = &cmd->iov_data[iov_off++]; 1173 1174 tx_sent = tx_data(conn, iov_p, 1, cmd->padding); 1175 if (cmd->padding != tx_sent) { 1176 if (tx_sent == -EAGAIN) { 1177 pr_err("tx_data() returned -EAGAIN\n"); 1178 goto send_padding; 1179 } 1180 return -1; 1181 } 1182 } 1183 1184 send_datacrc: 1185 if (conn->conn_ops->DataDigest) { 1186 struct kvec *iov_d = &cmd->iov_data[iov_off]; 1187 1188 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN); 1189 if (ISCSI_CRC_LEN != tx_sent) { 1190 if (tx_sent == -EAGAIN) { 1191 pr_err("tx_data() returned -EAGAIN\n"); 1192 goto send_datacrc; 1193 } 1194 return -1; 1195 } 1196 } 1197 1198 return 0; 1199 } 1200 1201 /* 1202 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU 1203 * back to the Initiator when an expection condition occurs with the 1204 * errors set in status_class and status_detail. 1205 * 1206 * Parameters: iSCSI Connection, Status Class, Status Detail. 1207 * Returns: 0 on success, -1 on error. 1208 */ 1209 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail) 1210 { 1211 u8 iscsi_hdr[ISCSI_HDR_LEN]; 1212 int err; 1213 struct kvec iov; 1214 struct iscsi_login_rsp *hdr; 1215 1216 iscsit_collect_login_stats(conn, status_class, status_detail); 1217 1218 memset(&iov, 0, sizeof(struct kvec)); 1219 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN); 1220 1221 hdr = (struct iscsi_login_rsp *)&iscsi_hdr; 1222 hdr->opcode = ISCSI_OP_LOGIN_RSP; 1223 hdr->status_class = status_class; 1224 hdr->status_detail = status_detail; 1225 hdr->itt = cpu_to_be32(conn->login_itt); 1226 1227 iov.iov_base = &iscsi_hdr; 1228 iov.iov_len = ISCSI_HDR_LEN; 1229 1230 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN); 1231 1232 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN); 1233 if (err != ISCSI_HDR_LEN) { 1234 pr_err("tx_data returned less than expected\n"); 1235 return -1; 1236 } 1237 1238 return 0; 1239 } 1240 1241 void iscsit_print_session_params(struct iscsi_session *sess) 1242 { 1243 struct iscsi_conn *conn; 1244 1245 pr_debug("-----------------------------[Session Params for" 1246 " SID: %u]-----------------------------\n", sess->sid); 1247 spin_lock_bh(&sess->conn_lock); 1248 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 1249 iscsi_dump_conn_ops(conn->conn_ops); 1250 spin_unlock_bh(&sess->conn_lock); 1251 1252 iscsi_dump_sess_ops(sess->sess_ops); 1253 } 1254 1255 static int iscsit_do_rx_data( 1256 struct iscsi_conn *conn, 1257 struct iscsi_data_count *count) 1258 { 1259 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len; 1260 struct kvec *iov_p; 1261 struct msghdr msg; 1262 1263 if (!conn || !conn->sock || !conn->conn_ops) 1264 return -1; 1265 1266 memset(&msg, 0, sizeof(struct msghdr)); 1267 1268 iov_p = count->iov; 1269 iov_len = count->iov_count; 1270 1271 while (total_rx < data) { 1272 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len, 1273 (data - total_rx), MSG_WAITALL); 1274 if (rx_loop <= 0) { 1275 pr_debug("rx_loop: %d total_rx: %d\n", 1276 rx_loop, total_rx); 1277 return rx_loop; 1278 } 1279 total_rx += rx_loop; 1280 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n", 1281 rx_loop, total_rx, data); 1282 } 1283 1284 return total_rx; 1285 } 1286 1287 static int iscsit_do_tx_data( 1288 struct iscsi_conn *conn, 1289 struct iscsi_data_count *count) 1290 { 1291 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len; 1292 struct kvec *iov_p; 1293 struct msghdr msg; 1294 1295 if (!conn || !conn->sock || !conn->conn_ops) 1296 return -1; 1297 1298 if (data <= 0) { 1299 pr_err("Data length is: %d\n", data); 1300 return -1; 1301 } 1302 1303 memset(&msg, 0, sizeof(struct msghdr)); 1304 1305 iov_p = count->iov; 1306 iov_len = count->iov_count; 1307 1308 while (total_tx < data) { 1309 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len, 1310 (data - total_tx)); 1311 if (tx_loop <= 0) { 1312 pr_debug("tx_loop: %d total_tx %d\n", 1313 tx_loop, total_tx); 1314 return tx_loop; 1315 } 1316 total_tx += tx_loop; 1317 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n", 1318 tx_loop, total_tx, data); 1319 } 1320 1321 return total_tx; 1322 } 1323 1324 int rx_data( 1325 struct iscsi_conn *conn, 1326 struct kvec *iov, 1327 int iov_count, 1328 int data) 1329 { 1330 struct iscsi_data_count c; 1331 1332 if (!conn || !conn->sock || !conn->conn_ops) 1333 return -1; 1334 1335 memset(&c, 0, sizeof(struct iscsi_data_count)); 1336 c.iov = iov; 1337 c.iov_count = iov_count; 1338 c.data_length = data; 1339 c.type = ISCSI_RX_DATA; 1340 1341 return iscsit_do_rx_data(conn, &c); 1342 } 1343 1344 int tx_data( 1345 struct iscsi_conn *conn, 1346 struct kvec *iov, 1347 int iov_count, 1348 int data) 1349 { 1350 struct iscsi_data_count c; 1351 1352 if (!conn || !conn->sock || !conn->conn_ops) 1353 return -1; 1354 1355 memset(&c, 0, sizeof(struct iscsi_data_count)); 1356 c.iov = iov; 1357 c.iov_count = iov_count; 1358 c.data_length = data; 1359 c.type = ISCSI_TX_DATA; 1360 1361 return iscsit_do_tx_data(conn, &c); 1362 } 1363 1364 void iscsit_collect_login_stats( 1365 struct iscsi_conn *conn, 1366 u8 status_class, 1367 u8 status_detail) 1368 { 1369 struct iscsi_param *intrname = NULL; 1370 struct iscsi_tiqn *tiqn; 1371 struct iscsi_login_stats *ls; 1372 1373 tiqn = iscsit_snmp_get_tiqn(conn); 1374 if (!tiqn) 1375 return; 1376 1377 ls = &tiqn->login_stats; 1378 1379 spin_lock(&ls->lock); 1380 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) && 1381 ((get_jiffies_64() - ls->last_fail_time) < 10)) { 1382 /* We already have the failure info for this login */ 1383 spin_unlock(&ls->lock); 1384 return; 1385 } 1386 1387 if (status_class == ISCSI_STATUS_CLS_SUCCESS) 1388 ls->accepts++; 1389 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) { 1390 ls->redirects++; 1391 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT; 1392 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1393 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) { 1394 ls->authenticate_fails++; 1395 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE; 1396 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1397 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) { 1398 ls->authorize_fails++; 1399 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE; 1400 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1401 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) { 1402 ls->negotiate_fails++; 1403 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE; 1404 } else { 1405 ls->other_fails++; 1406 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER; 1407 } 1408 1409 /* Save initiator name, ip address and time, if it is a failed login */ 1410 if (status_class != ISCSI_STATUS_CLS_SUCCESS) { 1411 if (conn->param_list) 1412 intrname = iscsi_find_param_from_key(INITIATORNAME, 1413 conn->param_list); 1414 strcpy(ls->last_intr_fail_name, 1415 (intrname ? intrname->value : "Unknown")); 1416 1417 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family; 1418 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE, 1419 "%s", conn->login_ip); 1420 ls->last_fail_time = get_jiffies_64(); 1421 } 1422 1423 spin_unlock(&ls->lock); 1424 } 1425 1426 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn) 1427 { 1428 struct iscsi_portal_group *tpg; 1429 1430 if (!conn || !conn->sess) 1431 return NULL; 1432 1433 tpg = conn->sess->tpg; 1434 if (!tpg) 1435 return NULL; 1436 1437 if (!tpg->tpg_tiqn) 1438 return NULL; 1439 1440 return tpg->tpg_tiqn; 1441 } 1442