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 <net/ipv6.h> /* ipv6_addr_equal() */ 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/iscsi/iscsi_transport.h> 27 28 #include <target/iscsi/iscsi_target_core.h> 29 #include "iscsi_target_parameters.h" 30 #include "iscsi_target_seq_pdu_list.h" 31 #include "iscsi_target_datain_values.h" 32 #include "iscsi_target_erl0.h" 33 #include "iscsi_target_erl1.h" 34 #include "iscsi_target_erl2.h" 35 #include "iscsi_target_tpg.h" 36 #include "iscsi_target_util.h" 37 #include "iscsi_target.h" 38 39 #define PRINT_BUFF(buff, len) \ 40 { \ 41 int zzz; \ 42 \ 43 pr_debug("%d:\n", __LINE__); \ 44 for (zzz = 0; zzz < len; zzz++) { \ 45 if (zzz % 16 == 0) { \ 46 if (zzz) \ 47 pr_debug("\n"); \ 48 pr_debug("%4i: ", zzz); \ 49 } \ 50 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \ 51 } \ 52 if ((len + 1) % 16) \ 53 pr_debug("\n"); \ 54 } 55 56 extern struct list_head g_tiqn_list; 57 extern spinlock_t tiqn_lock; 58 59 /* 60 * Called with cmd->r2t_lock held. 61 */ 62 int iscsit_add_r2t_to_list( 63 struct iscsi_cmd *cmd, 64 u32 offset, 65 u32 xfer_len, 66 int recovery, 67 u32 r2t_sn) 68 { 69 struct iscsi_r2t *r2t; 70 71 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC); 72 if (!r2t) { 73 pr_err("Unable to allocate memory for struct iscsi_r2t.\n"); 74 return -1; 75 } 76 INIT_LIST_HEAD(&r2t->r2t_list); 77 78 r2t->recovery_r2t = recovery; 79 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn; 80 r2t->offset = offset; 81 r2t->xfer_len = xfer_len; 82 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list); 83 spin_unlock_bh(&cmd->r2t_lock); 84 85 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); 86 87 spin_lock_bh(&cmd->r2t_lock); 88 return 0; 89 } 90 91 struct iscsi_r2t *iscsit_get_r2t_for_eos( 92 struct iscsi_cmd *cmd, 93 u32 offset, 94 u32 length) 95 { 96 struct iscsi_r2t *r2t; 97 98 spin_lock_bh(&cmd->r2t_lock); 99 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 100 if ((r2t->offset <= offset) && 101 (r2t->offset + r2t->xfer_len) >= (offset + length)) { 102 spin_unlock_bh(&cmd->r2t_lock); 103 return r2t; 104 } 105 } 106 spin_unlock_bh(&cmd->r2t_lock); 107 108 pr_err("Unable to locate R2T for Offset: %u, Length:" 109 " %u\n", offset, length); 110 return NULL; 111 } 112 113 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd) 114 { 115 struct iscsi_r2t *r2t; 116 117 spin_lock_bh(&cmd->r2t_lock); 118 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 119 if (!r2t->sent_r2t) { 120 spin_unlock_bh(&cmd->r2t_lock); 121 return r2t; 122 } 123 } 124 spin_unlock_bh(&cmd->r2t_lock); 125 126 pr_err("Unable to locate next R2T to send for ITT:" 127 " 0x%08x.\n", cmd->init_task_tag); 128 return NULL; 129 } 130 131 /* 132 * Called with cmd->r2t_lock held. 133 */ 134 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd) 135 { 136 list_del(&r2t->r2t_list); 137 kmem_cache_free(lio_r2t_cache, r2t); 138 } 139 140 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd) 141 { 142 struct iscsi_r2t *r2t, *r2t_tmp; 143 144 spin_lock_bh(&cmd->r2t_lock); 145 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) 146 iscsit_free_r2t(r2t, cmd); 147 spin_unlock_bh(&cmd->r2t_lock); 148 } 149 150 /* 151 * May be called from software interrupt (timer) context for allocating 152 * iSCSI NopINs. 153 */ 154 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state) 155 { 156 struct iscsi_cmd *cmd; 157 struct se_session *se_sess = conn->sess->se_sess; 158 int size, tag; 159 160 tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state); 161 if (tag < 0) 162 return NULL; 163 164 size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size; 165 cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size)); 166 memset(cmd, 0, size); 167 168 cmd->se_cmd.map_tag = tag; 169 cmd->conn = conn; 170 INIT_LIST_HEAD(&cmd->i_conn_node); 171 INIT_LIST_HEAD(&cmd->datain_list); 172 INIT_LIST_HEAD(&cmd->cmd_r2t_list); 173 spin_lock_init(&cmd->datain_lock); 174 spin_lock_init(&cmd->dataout_timeout_lock); 175 spin_lock_init(&cmd->istate_lock); 176 spin_lock_init(&cmd->error_lock); 177 spin_lock_init(&cmd->r2t_lock); 178 179 return cmd; 180 } 181 EXPORT_SYMBOL(iscsit_allocate_cmd); 182 183 struct iscsi_seq *iscsit_get_seq_holder_for_datain( 184 struct iscsi_cmd *cmd, 185 u32 seq_send_order) 186 { 187 u32 i; 188 189 for (i = 0; i < cmd->seq_count; i++) 190 if (cmd->seq_list[i].seq_send_order == seq_send_order) 191 return &cmd->seq_list[i]; 192 193 return NULL; 194 } 195 196 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd) 197 { 198 u32 i; 199 200 if (!cmd->seq_list) { 201 pr_err("struct iscsi_cmd->seq_list is NULL!\n"); 202 return NULL; 203 } 204 205 for (i = 0; i < cmd->seq_count; i++) { 206 if (cmd->seq_list[i].type != SEQTYPE_NORMAL) 207 continue; 208 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) { 209 cmd->seq_send_order++; 210 return &cmd->seq_list[i]; 211 } 212 } 213 214 return NULL; 215 } 216 217 struct iscsi_r2t *iscsit_get_holder_for_r2tsn( 218 struct iscsi_cmd *cmd, 219 u32 r2t_sn) 220 { 221 struct iscsi_r2t *r2t; 222 223 spin_lock_bh(&cmd->r2t_lock); 224 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 225 if (r2t->r2t_sn == r2t_sn) { 226 spin_unlock_bh(&cmd->r2t_lock); 227 return r2t; 228 } 229 } 230 spin_unlock_bh(&cmd->r2t_lock); 231 232 return NULL; 233 } 234 235 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn) 236 { 237 u32 max_cmdsn; 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 max_cmdsn = atomic_read(&sess->max_cmd_sn); 247 if (iscsi_sna_gt(cmdsn, max_cmdsn)) { 248 pr_err("Received CmdSN: 0x%08x is greater than" 249 " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn); 250 ret = CMDSN_MAXCMDSN_OVERRUN; 251 252 } else if (cmdsn == sess->exp_cmd_sn) { 253 sess->exp_cmd_sn++; 254 pr_debug("Received CmdSN matches ExpCmdSN," 255 " incremented ExpCmdSN to: 0x%08x\n", 256 sess->exp_cmd_sn); 257 ret = CMDSN_NORMAL_OPERATION; 258 259 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) { 260 pr_debug("Received CmdSN: 0x%08x is greater" 261 " than ExpCmdSN: 0x%08x, not acknowledging.\n", 262 cmdsn, sess->exp_cmd_sn); 263 ret = CMDSN_HIGHER_THAN_EXP; 264 265 } else { 266 pr_err("Received CmdSN: 0x%08x is less than" 267 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn, 268 sess->exp_cmd_sn); 269 ret = CMDSN_LOWER_THAN_EXP; 270 } 271 272 return ret; 273 } 274 275 /* 276 * Commands may be received out of order if MC/S is in use. 277 * Ensure they are executed in CmdSN order. 278 */ 279 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, 280 unsigned char *buf, __be32 cmdsn) 281 { 282 int ret, cmdsn_ret; 283 bool reject = false; 284 u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES; 285 286 mutex_lock(&conn->sess->cmdsn_mutex); 287 288 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn)); 289 switch (cmdsn_ret) { 290 case CMDSN_NORMAL_OPERATION: 291 ret = iscsit_execute_cmd(cmd, 0); 292 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list)) 293 iscsit_execute_ooo_cmdsns(conn->sess); 294 else if (ret < 0) { 295 reject = true; 296 ret = CMDSN_ERROR_CANNOT_RECOVER; 297 } 298 break; 299 case CMDSN_HIGHER_THAN_EXP: 300 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn)); 301 if (ret < 0) { 302 reject = true; 303 ret = CMDSN_ERROR_CANNOT_RECOVER; 304 break; 305 } 306 ret = CMDSN_HIGHER_THAN_EXP; 307 break; 308 case CMDSN_LOWER_THAN_EXP: 309 case CMDSN_MAXCMDSN_OVERRUN: 310 default: 311 cmd->i_state = ISTATE_REMOVE; 312 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 313 /* 314 * Existing callers for iscsit_sequence_cmd() will silently 315 * ignore commands with CMDSN_LOWER_THAN_EXP, so force this 316 * return for CMDSN_MAXCMDSN_OVERRUN as well.. 317 */ 318 ret = CMDSN_LOWER_THAN_EXP; 319 break; 320 } 321 mutex_unlock(&conn->sess->cmdsn_mutex); 322 323 if (reject) 324 iscsit_reject_cmd(cmd, reason, buf); 325 326 return ret; 327 } 328 EXPORT_SYMBOL(iscsit_sequence_cmd); 329 330 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf) 331 { 332 struct iscsi_conn *conn = cmd->conn; 333 struct se_cmd *se_cmd = &cmd->se_cmd; 334 struct iscsi_data *hdr = (struct iscsi_data *) buf; 335 u32 payload_length = ntoh24(hdr->dlength); 336 337 if (conn->sess->sess_ops->InitialR2T) { 338 pr_err("Received unexpected unsolicited data" 339 " while InitialR2T=Yes, protocol error.\n"); 340 transport_send_check_condition_and_sense(se_cmd, 341 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 342 return -1; 343 } 344 345 if ((cmd->first_burst_len + payload_length) > 346 conn->sess->sess_ops->FirstBurstLength) { 347 pr_err("Total %u bytes exceeds FirstBurstLength: %u" 348 " for this Unsolicited DataOut Burst.\n", 349 (cmd->first_burst_len + payload_length), 350 conn->sess->sess_ops->FirstBurstLength); 351 transport_send_check_condition_and_sense(se_cmd, 352 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 353 return -1; 354 } 355 356 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) 357 return 0; 358 359 if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) && 360 ((cmd->first_burst_len + payload_length) != 361 conn->sess->sess_ops->FirstBurstLength)) { 362 pr_err("Unsolicited non-immediate data received %u" 363 " does not equal FirstBurstLength: %u, and does" 364 " not equal ExpXferLen %u.\n", 365 (cmd->first_burst_len + payload_length), 366 conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length); 367 transport_send_check_condition_and_sense(se_cmd, 368 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 369 return -1; 370 } 371 return 0; 372 } 373 374 struct iscsi_cmd *iscsit_find_cmd_from_itt( 375 struct iscsi_conn *conn, 376 itt_t init_task_tag) 377 { 378 struct iscsi_cmd *cmd; 379 380 spin_lock_bh(&conn->cmd_lock); 381 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 382 if (cmd->init_task_tag == init_task_tag) { 383 spin_unlock_bh(&conn->cmd_lock); 384 return cmd; 385 } 386 } 387 spin_unlock_bh(&conn->cmd_lock); 388 389 pr_err("Unable to locate ITT: 0x%08x on CID: %hu", 390 init_task_tag, conn->cid); 391 return NULL; 392 } 393 EXPORT_SYMBOL(iscsit_find_cmd_from_itt); 394 395 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump( 396 struct iscsi_conn *conn, 397 itt_t init_task_tag, 398 u32 length) 399 { 400 struct iscsi_cmd *cmd; 401 402 spin_lock_bh(&conn->cmd_lock); 403 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 404 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) 405 continue; 406 if (cmd->init_task_tag == init_task_tag) { 407 spin_unlock_bh(&conn->cmd_lock); 408 return cmd; 409 } 410 } 411 spin_unlock_bh(&conn->cmd_lock); 412 413 pr_err("Unable to locate ITT: 0x%08x on CID: %hu," 414 " dumping payload\n", init_task_tag, conn->cid); 415 if (length) 416 iscsit_dump_data_payload(conn, length, 1); 417 418 return NULL; 419 } 420 421 struct iscsi_cmd *iscsit_find_cmd_from_ttt( 422 struct iscsi_conn *conn, 423 u32 targ_xfer_tag) 424 { 425 struct iscsi_cmd *cmd = NULL; 426 427 spin_lock_bh(&conn->cmd_lock); 428 list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) { 429 if (cmd->targ_xfer_tag == targ_xfer_tag) { 430 spin_unlock_bh(&conn->cmd_lock); 431 return cmd; 432 } 433 } 434 spin_unlock_bh(&conn->cmd_lock); 435 436 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n", 437 targ_xfer_tag, conn->cid); 438 return NULL; 439 } 440 441 int iscsit_find_cmd_for_recovery( 442 struct iscsi_session *sess, 443 struct iscsi_cmd **cmd_ptr, 444 struct iscsi_conn_recovery **cr_ptr, 445 itt_t init_task_tag) 446 { 447 struct iscsi_cmd *cmd = NULL; 448 struct iscsi_conn_recovery *cr; 449 /* 450 * Scan through the inactive connection recovery list's command list. 451 * If init_task_tag matches the command is still alligent. 452 */ 453 spin_lock(&sess->cr_i_lock); 454 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { 455 spin_lock(&cr->conn_recovery_cmd_lock); 456 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 457 if (cmd->init_task_tag == init_task_tag) { 458 spin_unlock(&cr->conn_recovery_cmd_lock); 459 spin_unlock(&sess->cr_i_lock); 460 461 *cr_ptr = cr; 462 *cmd_ptr = cmd; 463 return -2; 464 } 465 } 466 spin_unlock(&cr->conn_recovery_cmd_lock); 467 } 468 spin_unlock(&sess->cr_i_lock); 469 /* 470 * Scan through the active connection recovery list's command list. 471 * If init_task_tag matches the command is ready to be reassigned. 472 */ 473 spin_lock(&sess->cr_a_lock); 474 list_for_each_entry(cr, &sess->cr_active_list, cr_list) { 475 spin_lock(&cr->conn_recovery_cmd_lock); 476 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) { 477 if (cmd->init_task_tag == init_task_tag) { 478 spin_unlock(&cr->conn_recovery_cmd_lock); 479 spin_unlock(&sess->cr_a_lock); 480 481 *cr_ptr = cr; 482 *cmd_ptr = cmd; 483 return 0; 484 } 485 } 486 spin_unlock(&cr->conn_recovery_cmd_lock); 487 } 488 spin_unlock(&sess->cr_a_lock); 489 490 return -1; 491 } 492 493 void iscsit_add_cmd_to_immediate_queue( 494 struct iscsi_cmd *cmd, 495 struct iscsi_conn *conn, 496 u8 state) 497 { 498 struct iscsi_queue_req *qr; 499 500 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 501 if (!qr) { 502 pr_err("Unable to allocate memory for" 503 " struct iscsi_queue_req\n"); 504 return; 505 } 506 INIT_LIST_HEAD(&qr->qr_list); 507 qr->cmd = cmd; 508 qr->state = state; 509 510 spin_lock_bh(&conn->immed_queue_lock); 511 list_add_tail(&qr->qr_list, &conn->immed_queue_list); 512 atomic_inc(&cmd->immed_queue_count); 513 atomic_set(&conn->check_immediate_queue, 1); 514 spin_unlock_bh(&conn->immed_queue_lock); 515 516 wake_up(&conn->queues_wq); 517 } 518 EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue); 519 520 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn) 521 { 522 struct iscsi_queue_req *qr; 523 524 spin_lock_bh(&conn->immed_queue_lock); 525 if (list_empty(&conn->immed_queue_list)) { 526 spin_unlock_bh(&conn->immed_queue_lock); 527 return NULL; 528 } 529 qr = list_first_entry(&conn->immed_queue_list, 530 struct iscsi_queue_req, qr_list); 531 532 list_del(&qr->qr_list); 533 if (qr->cmd) 534 atomic_dec(&qr->cmd->immed_queue_count); 535 spin_unlock_bh(&conn->immed_queue_lock); 536 537 return qr; 538 } 539 540 static void iscsit_remove_cmd_from_immediate_queue( 541 struct iscsi_cmd *cmd, 542 struct iscsi_conn *conn) 543 { 544 struct iscsi_queue_req *qr, *qr_tmp; 545 546 spin_lock_bh(&conn->immed_queue_lock); 547 if (!atomic_read(&cmd->immed_queue_count)) { 548 spin_unlock_bh(&conn->immed_queue_lock); 549 return; 550 } 551 552 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 553 if (qr->cmd != cmd) 554 continue; 555 556 atomic_dec(&qr->cmd->immed_queue_count); 557 list_del(&qr->qr_list); 558 kmem_cache_free(lio_qr_cache, qr); 559 } 560 spin_unlock_bh(&conn->immed_queue_lock); 561 562 if (atomic_read(&cmd->immed_queue_count)) { 563 pr_err("ITT: 0x%08x immed_queue_count: %d\n", 564 cmd->init_task_tag, 565 atomic_read(&cmd->immed_queue_count)); 566 } 567 } 568 569 void iscsit_add_cmd_to_response_queue( 570 struct iscsi_cmd *cmd, 571 struct iscsi_conn *conn, 572 u8 state) 573 { 574 struct iscsi_queue_req *qr; 575 576 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 577 if (!qr) { 578 pr_err("Unable to allocate memory for" 579 " struct iscsi_queue_req\n"); 580 return; 581 } 582 INIT_LIST_HEAD(&qr->qr_list); 583 qr->cmd = cmd; 584 qr->state = state; 585 586 spin_lock_bh(&conn->response_queue_lock); 587 list_add_tail(&qr->qr_list, &conn->response_queue_list); 588 atomic_inc(&cmd->response_queue_count); 589 spin_unlock_bh(&conn->response_queue_lock); 590 591 wake_up(&conn->queues_wq); 592 } 593 594 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn) 595 { 596 struct iscsi_queue_req *qr; 597 598 spin_lock_bh(&conn->response_queue_lock); 599 if (list_empty(&conn->response_queue_list)) { 600 spin_unlock_bh(&conn->response_queue_lock); 601 return NULL; 602 } 603 604 qr = list_first_entry(&conn->response_queue_list, 605 struct iscsi_queue_req, qr_list); 606 607 list_del(&qr->qr_list); 608 if (qr->cmd) 609 atomic_dec(&qr->cmd->response_queue_count); 610 spin_unlock_bh(&conn->response_queue_lock); 611 612 return qr; 613 } 614 615 static void iscsit_remove_cmd_from_response_queue( 616 struct iscsi_cmd *cmd, 617 struct iscsi_conn *conn) 618 { 619 struct iscsi_queue_req *qr, *qr_tmp; 620 621 spin_lock_bh(&conn->response_queue_lock); 622 if (!atomic_read(&cmd->response_queue_count)) { 623 spin_unlock_bh(&conn->response_queue_lock); 624 return; 625 } 626 627 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 628 qr_list) { 629 if (qr->cmd != cmd) 630 continue; 631 632 atomic_dec(&qr->cmd->response_queue_count); 633 list_del(&qr->qr_list); 634 kmem_cache_free(lio_qr_cache, qr); 635 } 636 spin_unlock_bh(&conn->response_queue_lock); 637 638 if (atomic_read(&cmd->response_queue_count)) { 639 pr_err("ITT: 0x%08x response_queue_count: %d\n", 640 cmd->init_task_tag, 641 atomic_read(&cmd->response_queue_count)); 642 } 643 } 644 645 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn) 646 { 647 bool empty; 648 649 spin_lock_bh(&conn->immed_queue_lock); 650 empty = list_empty(&conn->immed_queue_list); 651 spin_unlock_bh(&conn->immed_queue_lock); 652 653 if (!empty) 654 return empty; 655 656 spin_lock_bh(&conn->response_queue_lock); 657 empty = list_empty(&conn->response_queue_list); 658 spin_unlock_bh(&conn->response_queue_lock); 659 660 return empty; 661 } 662 663 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn) 664 { 665 struct iscsi_queue_req *qr, *qr_tmp; 666 667 spin_lock_bh(&conn->immed_queue_lock); 668 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 669 list_del(&qr->qr_list); 670 if (qr->cmd) 671 atomic_dec(&qr->cmd->immed_queue_count); 672 673 kmem_cache_free(lio_qr_cache, qr); 674 } 675 spin_unlock_bh(&conn->immed_queue_lock); 676 677 spin_lock_bh(&conn->response_queue_lock); 678 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 679 qr_list) { 680 list_del(&qr->qr_list); 681 if (qr->cmd) 682 atomic_dec(&qr->cmd->response_queue_count); 683 684 kmem_cache_free(lio_qr_cache, qr); 685 } 686 spin_unlock_bh(&conn->response_queue_lock); 687 } 688 689 void iscsit_release_cmd(struct iscsi_cmd *cmd) 690 { 691 struct iscsi_session *sess; 692 struct se_cmd *se_cmd = &cmd->se_cmd; 693 694 if (cmd->conn) 695 sess = cmd->conn->sess; 696 else 697 sess = cmd->sess; 698 699 BUG_ON(!sess || !sess->se_sess); 700 701 kfree(cmd->buf_ptr); 702 kfree(cmd->pdu_list); 703 kfree(cmd->seq_list); 704 kfree(cmd->tmr_req); 705 kfree(cmd->iov_data); 706 kfree(cmd->text_in_ptr); 707 708 percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag); 709 } 710 EXPORT_SYMBOL(iscsit_release_cmd); 711 712 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd, 713 bool check_queues) 714 { 715 struct iscsi_conn *conn = cmd->conn; 716 717 if (scsi_cmd) { 718 if (cmd->data_direction == DMA_TO_DEVICE) { 719 iscsit_stop_dataout_timer(cmd); 720 iscsit_free_r2ts_from_list(cmd); 721 } 722 if (cmd->data_direction == DMA_FROM_DEVICE) 723 iscsit_free_all_datain_reqs(cmd); 724 } 725 726 if (conn && check_queues) { 727 iscsit_remove_cmd_from_immediate_queue(cmd, conn); 728 iscsit_remove_cmd_from_response_queue(cmd, conn); 729 } 730 731 if (conn && conn->conn_transport->iscsit_release_cmd) 732 conn->conn_transport->iscsit_release_cmd(conn, cmd); 733 } 734 735 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown) 736 { 737 struct se_cmd *se_cmd = NULL; 738 int rc; 739 /* 740 * Determine if a struct se_cmd is associated with 741 * this struct iscsi_cmd. 742 */ 743 switch (cmd->iscsi_opcode) { 744 case ISCSI_OP_SCSI_CMD: 745 se_cmd = &cmd->se_cmd; 746 __iscsit_free_cmd(cmd, true, shutdown); 747 /* 748 * Fallthrough 749 */ 750 case ISCSI_OP_SCSI_TMFUNC: 751 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown); 752 if (!rc && shutdown && se_cmd && se_cmd->se_sess) { 753 __iscsit_free_cmd(cmd, true, shutdown); 754 target_put_sess_cmd(se_cmd); 755 } 756 break; 757 case ISCSI_OP_REJECT: 758 /* 759 * Handle special case for REJECT when iscsi_add_reject*() has 760 * overwritten the original iscsi_opcode assignment, and the 761 * associated cmd->se_cmd needs to be released. 762 */ 763 if (cmd->se_cmd.se_tfo != NULL) { 764 se_cmd = &cmd->se_cmd; 765 __iscsit_free_cmd(cmd, true, shutdown); 766 767 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown); 768 if (!rc && shutdown && se_cmd->se_sess) { 769 __iscsit_free_cmd(cmd, true, shutdown); 770 target_put_sess_cmd(se_cmd); 771 } 772 break; 773 } 774 /* Fall-through */ 775 default: 776 __iscsit_free_cmd(cmd, false, shutdown); 777 iscsit_release_cmd(cmd); 778 break; 779 } 780 } 781 EXPORT_SYMBOL(iscsit_free_cmd); 782 783 int iscsit_check_session_usage_count(struct iscsi_session *sess) 784 { 785 spin_lock_bh(&sess->session_usage_lock); 786 if (sess->session_usage_count != 0) { 787 sess->session_waiting_on_uc = 1; 788 spin_unlock_bh(&sess->session_usage_lock); 789 if (in_interrupt()) 790 return 2; 791 792 wait_for_completion(&sess->session_waiting_on_uc_comp); 793 return 1; 794 } 795 spin_unlock_bh(&sess->session_usage_lock); 796 797 return 0; 798 } 799 800 void iscsit_dec_session_usage_count(struct iscsi_session *sess) 801 { 802 spin_lock_bh(&sess->session_usage_lock); 803 sess->session_usage_count--; 804 805 if (!sess->session_usage_count && sess->session_waiting_on_uc) 806 complete(&sess->session_waiting_on_uc_comp); 807 808 spin_unlock_bh(&sess->session_usage_lock); 809 } 810 811 void iscsit_inc_session_usage_count(struct iscsi_session *sess) 812 { 813 spin_lock_bh(&sess->session_usage_lock); 814 sess->session_usage_count++; 815 spin_unlock_bh(&sess->session_usage_lock); 816 } 817 818 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid) 819 { 820 struct iscsi_conn *conn; 821 822 spin_lock_bh(&sess->conn_lock); 823 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 824 if ((conn->cid == cid) && 825 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) { 826 iscsit_inc_conn_usage_count(conn); 827 spin_unlock_bh(&sess->conn_lock); 828 return conn; 829 } 830 } 831 spin_unlock_bh(&sess->conn_lock); 832 833 return NULL; 834 } 835 836 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid) 837 { 838 struct iscsi_conn *conn; 839 840 spin_lock_bh(&sess->conn_lock); 841 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 842 if (conn->cid == cid) { 843 iscsit_inc_conn_usage_count(conn); 844 spin_lock(&conn->state_lock); 845 atomic_set(&conn->connection_wait_rcfr, 1); 846 spin_unlock(&conn->state_lock); 847 spin_unlock_bh(&sess->conn_lock); 848 return conn; 849 } 850 } 851 spin_unlock_bh(&sess->conn_lock); 852 853 return NULL; 854 } 855 856 void iscsit_check_conn_usage_count(struct iscsi_conn *conn) 857 { 858 spin_lock_bh(&conn->conn_usage_lock); 859 if (conn->conn_usage_count != 0) { 860 conn->conn_waiting_on_uc = 1; 861 spin_unlock_bh(&conn->conn_usage_lock); 862 863 wait_for_completion(&conn->conn_waiting_on_uc_comp); 864 return; 865 } 866 spin_unlock_bh(&conn->conn_usage_lock); 867 } 868 869 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn) 870 { 871 spin_lock_bh(&conn->conn_usage_lock); 872 conn->conn_usage_count--; 873 874 if (!conn->conn_usage_count && conn->conn_waiting_on_uc) 875 complete(&conn->conn_waiting_on_uc_comp); 876 877 spin_unlock_bh(&conn->conn_usage_lock); 878 } 879 880 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn) 881 { 882 spin_lock_bh(&conn->conn_usage_lock); 883 conn->conn_usage_count++; 884 spin_unlock_bh(&conn->conn_usage_lock); 885 } 886 887 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response) 888 { 889 u8 state; 890 struct iscsi_cmd *cmd; 891 892 cmd = iscsit_allocate_cmd(conn, TASK_RUNNING); 893 if (!cmd) 894 return -1; 895 896 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN; 897 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE : 898 ISTATE_SEND_NOPIN_NO_RESPONSE; 899 cmd->init_task_tag = RESERVED_ITT; 900 cmd->targ_xfer_tag = (want_response) ? 901 session_get_next_ttt(conn->sess) : 0xFFFFFFFF; 902 spin_lock_bh(&conn->cmd_lock); 903 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); 904 spin_unlock_bh(&conn->cmd_lock); 905 906 if (want_response) 907 iscsit_start_nopin_response_timer(conn); 908 iscsit_add_cmd_to_immediate_queue(cmd, conn, state); 909 910 return 0; 911 } 912 913 static void iscsit_handle_nopin_response_timeout(unsigned long data) 914 { 915 struct iscsi_conn *conn = (struct iscsi_conn *) data; 916 917 iscsit_inc_conn_usage_count(conn); 918 919 spin_lock_bh(&conn->nopin_timer_lock); 920 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) { 921 spin_unlock_bh(&conn->nopin_timer_lock); 922 iscsit_dec_conn_usage_count(conn); 923 return; 924 } 925 926 pr_debug("Did not receive response to NOPIN on CID: %hu on" 927 " SID: %u, failing connection.\n", conn->cid, 928 conn->sess->sid); 929 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 930 spin_unlock_bh(&conn->nopin_timer_lock); 931 932 { 933 struct iscsi_portal_group *tpg = conn->sess->tpg; 934 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 935 936 if (tiqn) { 937 spin_lock_bh(&tiqn->sess_err_stats.lock); 938 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, 939 conn->sess->sess_ops->InitiatorName); 940 tiqn->sess_err_stats.last_sess_failure_type = 941 ISCSI_SESS_ERR_CXN_TIMEOUT; 942 tiqn->sess_err_stats.cxn_timeout_errors++; 943 atomic_long_inc(&conn->sess->conn_timeout_errors); 944 spin_unlock_bh(&tiqn->sess_err_stats.lock); 945 } 946 } 947 948 iscsit_cause_connection_reinstatement(conn, 0); 949 iscsit_dec_conn_usage_count(conn); 950 } 951 952 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn) 953 { 954 struct iscsi_session *sess = conn->sess; 955 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 956 957 spin_lock_bh(&conn->nopin_timer_lock); 958 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 959 spin_unlock_bh(&conn->nopin_timer_lock); 960 return; 961 } 962 963 mod_timer(&conn->nopin_response_timer, 964 (get_jiffies_64() + na->nopin_response_timeout * HZ)); 965 spin_unlock_bh(&conn->nopin_timer_lock); 966 } 967 968 /* 969 * Called with conn->nopin_timer_lock held. 970 */ 971 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn) 972 { 973 struct iscsi_session *sess = conn->sess; 974 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 975 976 spin_lock_bh(&conn->nopin_timer_lock); 977 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) { 978 spin_unlock_bh(&conn->nopin_timer_lock); 979 return; 980 } 981 982 init_timer(&conn->nopin_response_timer); 983 conn->nopin_response_timer.expires = 984 (get_jiffies_64() + na->nopin_response_timeout * HZ); 985 conn->nopin_response_timer.data = (unsigned long)conn; 986 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout; 987 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; 988 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; 989 add_timer(&conn->nopin_response_timer); 990 991 pr_debug("Started NOPIN Response Timer on CID: %d to %u" 992 " seconds\n", conn->cid, na->nopin_response_timeout); 993 spin_unlock_bh(&conn->nopin_timer_lock); 994 } 995 996 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn) 997 { 998 spin_lock_bh(&conn->nopin_timer_lock); 999 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 1000 spin_unlock_bh(&conn->nopin_timer_lock); 1001 return; 1002 } 1003 conn->nopin_response_timer_flags |= ISCSI_TF_STOP; 1004 spin_unlock_bh(&conn->nopin_timer_lock); 1005 1006 del_timer_sync(&conn->nopin_response_timer); 1007 1008 spin_lock_bh(&conn->nopin_timer_lock); 1009 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 1010 spin_unlock_bh(&conn->nopin_timer_lock); 1011 } 1012 1013 static void iscsit_handle_nopin_timeout(unsigned long data) 1014 { 1015 struct iscsi_conn *conn = (struct iscsi_conn *) data; 1016 1017 iscsit_inc_conn_usage_count(conn); 1018 1019 spin_lock_bh(&conn->nopin_timer_lock); 1020 if (conn->nopin_timer_flags & ISCSI_TF_STOP) { 1021 spin_unlock_bh(&conn->nopin_timer_lock); 1022 iscsit_dec_conn_usage_count(conn); 1023 return; 1024 } 1025 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1026 spin_unlock_bh(&conn->nopin_timer_lock); 1027 1028 iscsit_add_nopin(conn, 1); 1029 iscsit_dec_conn_usage_count(conn); 1030 } 1031 1032 /* 1033 * Called with conn->nopin_timer_lock held. 1034 */ 1035 void __iscsit_start_nopin_timer(struct iscsi_conn *conn) 1036 { 1037 struct iscsi_session *sess = conn->sess; 1038 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1039 /* 1040 * NOPIN timeout is disabled. 1041 */ 1042 if (!na->nopin_timeout) 1043 return; 1044 1045 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) 1046 return; 1047 1048 init_timer(&conn->nopin_timer); 1049 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1050 conn->nopin_timer.data = (unsigned long)conn; 1051 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1052 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1053 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1054 add_timer(&conn->nopin_timer); 1055 1056 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1057 " interval\n", conn->cid, na->nopin_timeout); 1058 } 1059 1060 void iscsit_start_nopin_timer(struct iscsi_conn *conn) 1061 { 1062 struct iscsi_session *sess = conn->sess; 1063 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1064 /* 1065 * NOPIN timeout is disabled.. 1066 */ 1067 if (!na->nopin_timeout) 1068 return; 1069 1070 spin_lock_bh(&conn->nopin_timer_lock); 1071 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) { 1072 spin_unlock_bh(&conn->nopin_timer_lock); 1073 return; 1074 } 1075 1076 init_timer(&conn->nopin_timer); 1077 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1078 conn->nopin_timer.data = (unsigned long)conn; 1079 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1080 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1081 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1082 add_timer(&conn->nopin_timer); 1083 1084 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1085 " interval\n", conn->cid, na->nopin_timeout); 1086 spin_unlock_bh(&conn->nopin_timer_lock); 1087 } 1088 1089 void iscsit_stop_nopin_timer(struct iscsi_conn *conn) 1090 { 1091 spin_lock_bh(&conn->nopin_timer_lock); 1092 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) { 1093 spin_unlock_bh(&conn->nopin_timer_lock); 1094 return; 1095 } 1096 conn->nopin_timer_flags |= ISCSI_TF_STOP; 1097 spin_unlock_bh(&conn->nopin_timer_lock); 1098 1099 del_timer_sync(&conn->nopin_timer); 1100 1101 spin_lock_bh(&conn->nopin_timer_lock); 1102 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1103 spin_unlock_bh(&conn->nopin_timer_lock); 1104 } 1105 1106 int iscsit_send_tx_data( 1107 struct iscsi_cmd *cmd, 1108 struct iscsi_conn *conn, 1109 int use_misc) 1110 { 1111 int tx_sent, tx_size; 1112 u32 iov_count; 1113 struct kvec *iov; 1114 1115 send_data: 1116 tx_size = cmd->tx_size; 1117 1118 if (!use_misc) { 1119 iov = &cmd->iov_data[0]; 1120 iov_count = cmd->iov_data_count; 1121 } else { 1122 iov = &cmd->iov_misc[0]; 1123 iov_count = cmd->iov_misc_count; 1124 } 1125 1126 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size); 1127 if (tx_size != tx_sent) { 1128 if (tx_sent == -EAGAIN) { 1129 pr_err("tx_data() returned -EAGAIN\n"); 1130 goto send_data; 1131 } else 1132 return -1; 1133 } 1134 cmd->tx_size = 0; 1135 1136 return 0; 1137 } 1138 1139 int iscsit_fe_sendpage_sg( 1140 struct iscsi_cmd *cmd, 1141 struct iscsi_conn *conn) 1142 { 1143 struct scatterlist *sg = cmd->first_data_sg; 1144 struct kvec iov; 1145 u32 tx_hdr_size, data_len; 1146 u32 offset = cmd->first_data_sg_off; 1147 int tx_sent, iov_off; 1148 1149 send_hdr: 1150 tx_hdr_size = ISCSI_HDR_LEN; 1151 if (conn->conn_ops->HeaderDigest) 1152 tx_hdr_size += ISCSI_CRC_LEN; 1153 1154 iov.iov_base = cmd->pdu; 1155 iov.iov_len = tx_hdr_size; 1156 1157 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size); 1158 if (tx_hdr_size != tx_sent) { 1159 if (tx_sent == -EAGAIN) { 1160 pr_err("tx_data() returned -EAGAIN\n"); 1161 goto send_hdr; 1162 } 1163 return -1; 1164 } 1165 1166 data_len = cmd->tx_size - tx_hdr_size - cmd->padding; 1167 /* 1168 * Set iov_off used by padding and data digest tx_data() calls below 1169 * in order to determine proper offset into cmd->iov_data[] 1170 */ 1171 if (conn->conn_ops->DataDigest) { 1172 data_len -= ISCSI_CRC_LEN; 1173 if (cmd->padding) 1174 iov_off = (cmd->iov_data_count - 2); 1175 else 1176 iov_off = (cmd->iov_data_count - 1); 1177 } else { 1178 iov_off = (cmd->iov_data_count - 1); 1179 } 1180 /* 1181 * Perform sendpage() for each page in the scatterlist 1182 */ 1183 while (data_len) { 1184 u32 space = (sg->length - offset); 1185 u32 sub_len = min_t(u32, data_len, space); 1186 send_pg: 1187 tx_sent = conn->sock->ops->sendpage(conn->sock, 1188 sg_page(sg), sg->offset + offset, sub_len, 0); 1189 if (tx_sent != sub_len) { 1190 if (tx_sent == -EAGAIN) { 1191 pr_err("tcp_sendpage() returned" 1192 " -EAGAIN\n"); 1193 goto send_pg; 1194 } 1195 1196 pr_err("tcp_sendpage() failure: %d\n", 1197 tx_sent); 1198 return -1; 1199 } 1200 1201 data_len -= sub_len; 1202 offset = 0; 1203 sg = sg_next(sg); 1204 } 1205 1206 send_padding: 1207 if (cmd->padding) { 1208 struct kvec *iov_p = &cmd->iov_data[iov_off++]; 1209 1210 tx_sent = tx_data(conn, iov_p, 1, cmd->padding); 1211 if (cmd->padding != tx_sent) { 1212 if (tx_sent == -EAGAIN) { 1213 pr_err("tx_data() returned -EAGAIN\n"); 1214 goto send_padding; 1215 } 1216 return -1; 1217 } 1218 } 1219 1220 send_datacrc: 1221 if (conn->conn_ops->DataDigest) { 1222 struct kvec *iov_d = &cmd->iov_data[iov_off]; 1223 1224 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN); 1225 if (ISCSI_CRC_LEN != tx_sent) { 1226 if (tx_sent == -EAGAIN) { 1227 pr_err("tx_data() returned -EAGAIN\n"); 1228 goto send_datacrc; 1229 } 1230 return -1; 1231 } 1232 } 1233 1234 return 0; 1235 } 1236 1237 /* 1238 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU 1239 * back to the Initiator when an expection condition occurs with the 1240 * errors set in status_class and status_detail. 1241 * 1242 * Parameters: iSCSI Connection, Status Class, Status Detail. 1243 * Returns: 0 on success, -1 on error. 1244 */ 1245 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail) 1246 { 1247 struct iscsi_login_rsp *hdr; 1248 struct iscsi_login *login = conn->conn_login; 1249 1250 login->login_failed = 1; 1251 iscsit_collect_login_stats(conn, status_class, status_detail); 1252 1253 memset(&login->rsp[0], 0, ISCSI_HDR_LEN); 1254 1255 hdr = (struct iscsi_login_rsp *)&login->rsp[0]; 1256 hdr->opcode = ISCSI_OP_LOGIN_RSP; 1257 hdr->status_class = status_class; 1258 hdr->status_detail = status_detail; 1259 hdr->itt = conn->login_itt; 1260 1261 return conn->conn_transport->iscsit_put_login_tx(conn, login, 0); 1262 } 1263 1264 void iscsit_print_session_params(struct iscsi_session *sess) 1265 { 1266 struct iscsi_conn *conn; 1267 1268 pr_debug("-----------------------------[Session Params for" 1269 " SID: %u]-----------------------------\n", sess->sid); 1270 spin_lock_bh(&sess->conn_lock); 1271 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 1272 iscsi_dump_conn_ops(conn->conn_ops); 1273 spin_unlock_bh(&sess->conn_lock); 1274 1275 iscsi_dump_sess_ops(sess->sess_ops); 1276 } 1277 1278 static int iscsit_do_rx_data( 1279 struct iscsi_conn *conn, 1280 struct iscsi_data_count *count) 1281 { 1282 int data = count->data_length, rx_loop = 0, total_rx = 0; 1283 struct msghdr msg; 1284 1285 if (!conn || !conn->sock || !conn->conn_ops) 1286 return -1; 1287 1288 memset(&msg, 0, sizeof(struct msghdr)); 1289 iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, 1290 count->iov, count->iov_count, data); 1291 1292 while (msg_data_left(&msg)) { 1293 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL); 1294 if (rx_loop <= 0) { 1295 pr_debug("rx_loop: %d total_rx: %d\n", 1296 rx_loop, total_rx); 1297 return rx_loop; 1298 } 1299 total_rx += rx_loop; 1300 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n", 1301 rx_loop, total_rx, data); 1302 } 1303 1304 return total_rx; 1305 } 1306 1307 static int iscsit_do_tx_data( 1308 struct iscsi_conn *conn, 1309 struct iscsi_data_count *count) 1310 { 1311 int ret, iov_len; 1312 struct kvec *iov_p; 1313 struct msghdr msg; 1314 1315 if (!conn || !conn->sock || !conn->conn_ops) 1316 return -1; 1317 1318 if (count->data_length <= 0) { 1319 pr_err("Data length is: %d\n", count->data_length); 1320 return -1; 1321 } 1322 1323 memset(&msg, 0, sizeof(struct msghdr)); 1324 1325 iov_p = count->iov; 1326 iov_len = count->iov_count; 1327 1328 ret = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len, 1329 count->data_length); 1330 if (ret != count->data_length) { 1331 pr_err("Unexpected ret: %d send data %d\n", 1332 ret, count->data_length); 1333 return -EPIPE; 1334 } 1335 pr_debug("ret: %d, sent data: %d\n", ret, count->data_length); 1336 1337 return ret; 1338 } 1339 1340 int rx_data( 1341 struct iscsi_conn *conn, 1342 struct kvec *iov, 1343 int iov_count, 1344 int data) 1345 { 1346 struct iscsi_data_count c; 1347 1348 if (!conn || !conn->sock || !conn->conn_ops) 1349 return -1; 1350 1351 memset(&c, 0, sizeof(struct iscsi_data_count)); 1352 c.iov = iov; 1353 c.iov_count = iov_count; 1354 c.data_length = data; 1355 c.type = ISCSI_RX_DATA; 1356 1357 return iscsit_do_rx_data(conn, &c); 1358 } 1359 1360 int tx_data( 1361 struct iscsi_conn *conn, 1362 struct kvec *iov, 1363 int iov_count, 1364 int data) 1365 { 1366 struct iscsi_data_count c; 1367 1368 if (!conn || !conn->sock || !conn->conn_ops) 1369 return -1; 1370 1371 memset(&c, 0, sizeof(struct iscsi_data_count)); 1372 c.iov = iov; 1373 c.iov_count = iov_count; 1374 c.data_length = data; 1375 c.type = ISCSI_TX_DATA; 1376 1377 return iscsit_do_tx_data(conn, &c); 1378 } 1379 1380 static bool sockaddr_equal(struct sockaddr_storage *x, struct sockaddr_storage *y) 1381 { 1382 switch (x->ss_family) { 1383 case AF_INET: { 1384 struct sockaddr_in *sinx = (struct sockaddr_in *)x; 1385 struct sockaddr_in *siny = (struct sockaddr_in *)y; 1386 if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) 1387 return false; 1388 if (sinx->sin_port != siny->sin_port) 1389 return false; 1390 break; 1391 } 1392 case AF_INET6: { 1393 struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; 1394 struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; 1395 if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) 1396 return false; 1397 if (sinx->sin6_port != siny->sin6_port) 1398 return false; 1399 break; 1400 } 1401 default: 1402 return false; 1403 } 1404 return true; 1405 } 1406 1407 void iscsit_collect_login_stats( 1408 struct iscsi_conn *conn, 1409 u8 status_class, 1410 u8 status_detail) 1411 { 1412 struct iscsi_param *intrname = NULL; 1413 struct iscsi_tiqn *tiqn; 1414 struct iscsi_login_stats *ls; 1415 1416 tiqn = iscsit_snmp_get_tiqn(conn); 1417 if (!tiqn) 1418 return; 1419 1420 ls = &tiqn->login_stats; 1421 1422 spin_lock(&ls->lock); 1423 if (sockaddr_equal(&conn->login_sockaddr, &ls->last_intr_fail_sockaddr) && 1424 ((get_jiffies_64() - ls->last_fail_time) < 10)) { 1425 /* We already have the failure info for this login */ 1426 spin_unlock(&ls->lock); 1427 return; 1428 } 1429 1430 if (status_class == ISCSI_STATUS_CLS_SUCCESS) 1431 ls->accepts++; 1432 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) { 1433 ls->redirects++; 1434 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT; 1435 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1436 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) { 1437 ls->authenticate_fails++; 1438 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE; 1439 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1440 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) { 1441 ls->authorize_fails++; 1442 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE; 1443 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1444 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) { 1445 ls->negotiate_fails++; 1446 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE; 1447 } else { 1448 ls->other_fails++; 1449 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER; 1450 } 1451 1452 /* Save initiator name, ip address and time, if it is a failed login */ 1453 if (status_class != ISCSI_STATUS_CLS_SUCCESS) { 1454 if (conn->param_list) 1455 intrname = iscsi_find_param_from_key(INITIATORNAME, 1456 conn->param_list); 1457 strlcpy(ls->last_intr_fail_name, 1458 (intrname ? intrname->value : "Unknown"), 1459 sizeof(ls->last_intr_fail_name)); 1460 1461 ls->last_intr_fail_ip_family = conn->login_family; 1462 1463 ls->last_intr_fail_sockaddr = conn->login_sockaddr; 1464 ls->last_fail_time = get_jiffies_64(); 1465 } 1466 1467 spin_unlock(&ls->lock); 1468 } 1469 1470 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn) 1471 { 1472 struct iscsi_portal_group *tpg; 1473 1474 if (!conn || !conn->sess) 1475 return NULL; 1476 1477 tpg = conn->sess->tpg; 1478 if (!tpg) 1479 return NULL; 1480 1481 if (!tpg->tpg_tiqn) 1482 return NULL; 1483 1484 return tpg->tpg_tiqn; 1485 } 1486