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_list); 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 /* 180 * Called from iscsi_handle_scsi_cmd() 181 */ 182 struct iscsi_cmd *iscsit_allocate_se_cmd( 183 struct iscsi_conn *conn, 184 u32 data_length, 185 int data_direction, 186 int iscsi_task_attr) 187 { 188 struct iscsi_cmd *cmd; 189 struct se_cmd *se_cmd; 190 int sam_task_attr; 191 192 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 193 if (!cmd) 194 return NULL; 195 196 cmd->data_direction = data_direction; 197 cmd->data_length = data_length; 198 /* 199 * Figure out the SAM Task Attribute for the incoming SCSI CDB 200 */ 201 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 202 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 203 sam_task_attr = MSG_SIMPLE_TAG; 204 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 205 sam_task_attr = MSG_ORDERED_TAG; 206 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 207 sam_task_attr = MSG_HEAD_TAG; 208 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 209 sam_task_attr = MSG_ACA_TAG; 210 else { 211 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 212 " MSG_SIMPLE_TAG\n", iscsi_task_attr); 213 sam_task_attr = MSG_SIMPLE_TAG; 214 } 215 216 se_cmd = &cmd->se_cmd; 217 /* 218 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 219 */ 220 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops, 221 conn->sess->se_sess, data_length, data_direction, 222 sam_task_attr, &cmd->sense_buffer[0]); 223 return cmd; 224 } 225 226 struct iscsi_cmd *iscsit_allocate_se_cmd_for_tmr( 227 struct iscsi_conn *conn, 228 u8 function) 229 { 230 struct iscsi_cmd *cmd; 231 struct se_cmd *se_cmd; 232 int rc; 233 u8 tcm_function; 234 235 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 236 if (!cmd) 237 return NULL; 238 239 cmd->data_direction = DMA_NONE; 240 241 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); 242 if (!cmd->tmr_req) { 243 pr_err("Unable to allocate memory for" 244 " Task Management command!\n"); 245 goto out; 246 } 247 /* 248 * TASK_REASSIGN for ERL=2 / connection stays inside of 249 * LIO-Target $FABRIC_MOD 250 */ 251 if (function == ISCSI_TM_FUNC_TASK_REASSIGN) 252 return cmd; 253 254 se_cmd = &cmd->se_cmd; 255 /* 256 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 257 */ 258 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops, 259 conn->sess->se_sess, 0, DMA_NONE, 260 MSG_SIMPLE_TAG, &cmd->sense_buffer[0]); 261 262 switch (function) { 263 case ISCSI_TM_FUNC_ABORT_TASK: 264 tcm_function = TMR_ABORT_TASK; 265 break; 266 case ISCSI_TM_FUNC_ABORT_TASK_SET: 267 tcm_function = TMR_ABORT_TASK_SET; 268 break; 269 case ISCSI_TM_FUNC_CLEAR_ACA: 270 tcm_function = TMR_CLEAR_ACA; 271 break; 272 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 273 tcm_function = TMR_CLEAR_TASK_SET; 274 break; 275 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 276 tcm_function = TMR_LUN_RESET; 277 break; 278 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 279 tcm_function = TMR_TARGET_WARM_RESET; 280 break; 281 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 282 tcm_function = TMR_TARGET_COLD_RESET; 283 break; 284 default: 285 pr_err("Unknown iSCSI TMR Function:" 286 " 0x%02x\n", function); 287 goto out; 288 } 289 290 rc = core_tmr_alloc_req(se_cmd, cmd->tmr_req, tcm_function, GFP_KERNEL); 291 if (rc < 0) 292 goto out; 293 294 cmd->tmr_req->se_tmr_req = se_cmd->se_tmr_req; 295 296 return cmd; 297 out: 298 iscsit_release_cmd(cmd); 299 return NULL; 300 } 301 302 int iscsit_decide_list_to_build( 303 struct iscsi_cmd *cmd, 304 u32 immediate_data_length) 305 { 306 struct iscsi_build_list bl; 307 struct iscsi_conn *conn = cmd->conn; 308 struct iscsi_session *sess = conn->sess; 309 struct iscsi_node_attrib *na; 310 311 if (sess->sess_ops->DataSequenceInOrder && 312 sess->sess_ops->DataPDUInOrder) 313 return 0; 314 315 if (cmd->data_direction == DMA_NONE) 316 return 0; 317 318 na = iscsit_tpg_get_node_attrib(sess); 319 memset(&bl, 0, sizeof(struct iscsi_build_list)); 320 321 if (cmd->data_direction == DMA_FROM_DEVICE) { 322 bl.data_direction = ISCSI_PDU_READ; 323 bl.type = PDULIST_NORMAL; 324 if (na->random_datain_pdu_offsets) 325 bl.randomize |= RANDOM_DATAIN_PDU_OFFSETS; 326 if (na->random_datain_seq_offsets) 327 bl.randomize |= RANDOM_DATAIN_SEQ_OFFSETS; 328 } else { 329 bl.data_direction = ISCSI_PDU_WRITE; 330 bl.immediate_data_length = immediate_data_length; 331 if (na->random_r2t_offsets) 332 bl.randomize |= RANDOM_R2T_OFFSETS; 333 334 if (!cmd->immediate_data && !cmd->unsolicited_data) 335 bl.type = PDULIST_NORMAL; 336 else if (cmd->immediate_data && !cmd->unsolicited_data) 337 bl.type = PDULIST_IMMEDIATE; 338 else if (!cmd->immediate_data && cmd->unsolicited_data) 339 bl.type = PDULIST_UNSOLICITED; 340 else if (cmd->immediate_data && cmd->unsolicited_data) 341 bl.type = PDULIST_IMMEDIATE_AND_UNSOLICITED; 342 } 343 344 return iscsit_do_build_list(cmd, &bl); 345 } 346 347 struct iscsi_seq *iscsit_get_seq_holder_for_datain( 348 struct iscsi_cmd *cmd, 349 u32 seq_send_order) 350 { 351 u32 i; 352 353 for (i = 0; i < cmd->seq_count; i++) 354 if (cmd->seq_list[i].seq_send_order == seq_send_order) 355 return &cmd->seq_list[i]; 356 357 return NULL; 358 } 359 360 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd) 361 { 362 u32 i; 363 364 if (!cmd->seq_list) { 365 pr_err("struct iscsi_cmd->seq_list is NULL!\n"); 366 return NULL; 367 } 368 369 for (i = 0; i < cmd->seq_count; i++) { 370 if (cmd->seq_list[i].type != SEQTYPE_NORMAL) 371 continue; 372 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) { 373 cmd->seq_send_order++; 374 return &cmd->seq_list[i]; 375 } 376 } 377 378 return NULL; 379 } 380 381 struct iscsi_r2t *iscsit_get_holder_for_r2tsn( 382 struct iscsi_cmd *cmd, 383 u32 r2t_sn) 384 { 385 struct iscsi_r2t *r2t; 386 387 spin_lock_bh(&cmd->r2t_lock); 388 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 389 if (r2t->r2t_sn == r2t_sn) { 390 spin_unlock_bh(&cmd->r2t_lock); 391 return r2t; 392 } 393 } 394 spin_unlock_bh(&cmd->r2t_lock); 395 396 return NULL; 397 } 398 399 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn) 400 { 401 int ret; 402 403 /* 404 * This is the proper method of checking received CmdSN against 405 * ExpCmdSN and MaxCmdSN values, as well as accounting for out 406 * or order CmdSNs due to multiple connection sessions and/or 407 * CRC failures. 408 */ 409 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) { 410 pr_err("Received CmdSN: 0x%08x is greater than" 411 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn, 412 sess->max_cmd_sn); 413 ret = CMDSN_ERROR_CANNOT_RECOVER; 414 415 } else if (cmdsn == sess->exp_cmd_sn) { 416 sess->exp_cmd_sn++; 417 pr_debug("Received CmdSN matches ExpCmdSN," 418 " incremented ExpCmdSN to: 0x%08x\n", 419 sess->exp_cmd_sn); 420 ret = CMDSN_NORMAL_OPERATION; 421 422 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) { 423 pr_debug("Received CmdSN: 0x%08x is greater" 424 " than ExpCmdSN: 0x%08x, not acknowledging.\n", 425 cmdsn, sess->exp_cmd_sn); 426 ret = CMDSN_HIGHER_THAN_EXP; 427 428 } else { 429 pr_err("Received CmdSN: 0x%08x is less than" 430 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn, 431 sess->exp_cmd_sn); 432 ret = CMDSN_LOWER_THAN_EXP; 433 } 434 435 return ret; 436 } 437 438 /* 439 * Commands may be received out of order if MC/S is in use. 440 * Ensure they are executed in CmdSN order. 441 */ 442 int iscsit_sequence_cmd( 443 struct iscsi_conn *conn, 444 struct iscsi_cmd *cmd, 445 u32 cmdsn) 446 { 447 int ret; 448 int cmdsn_ret; 449 450 mutex_lock(&conn->sess->cmdsn_mutex); 451 452 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, cmdsn); 453 switch (cmdsn_ret) { 454 case CMDSN_NORMAL_OPERATION: 455 ret = iscsit_execute_cmd(cmd, 0); 456 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list)) 457 iscsit_execute_ooo_cmdsns(conn->sess); 458 break; 459 case CMDSN_HIGHER_THAN_EXP: 460 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn); 461 break; 462 case CMDSN_LOWER_THAN_EXP: 463 cmd->i_state = ISTATE_REMOVE; 464 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 465 ret = cmdsn_ret; 466 break; 467 default: 468 ret = cmdsn_ret; 469 break; 470 } 471 mutex_unlock(&conn->sess->cmdsn_mutex); 472 473 return ret; 474 } 475 476 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf) 477 { 478 struct iscsi_conn *conn = cmd->conn; 479 struct se_cmd *se_cmd = &cmd->se_cmd; 480 struct iscsi_data *hdr = (struct iscsi_data *) buf; 481 u32 payload_length = ntoh24(hdr->dlength); 482 483 if (conn->sess->sess_ops->InitialR2T) { 484 pr_err("Received unexpected unsolicited data" 485 " while InitialR2T=Yes, protocol error.\n"); 486 transport_send_check_condition_and_sense(se_cmd, 487 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 488 return -1; 489 } 490 491 if ((cmd->first_burst_len + payload_length) > 492 conn->sess->sess_ops->FirstBurstLength) { 493 pr_err("Total %u bytes exceeds FirstBurstLength: %u" 494 " for this Unsolicited DataOut Burst.\n", 495 (cmd->first_burst_len + payload_length), 496 conn->sess->sess_ops->FirstBurstLength); 497 transport_send_check_condition_and_sense(se_cmd, 498 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 499 return -1; 500 } 501 502 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) 503 return 0; 504 505 if (((cmd->first_burst_len + payload_length) != cmd->data_length) && 506 ((cmd->first_burst_len + payload_length) != 507 conn->sess->sess_ops->FirstBurstLength)) { 508 pr_err("Unsolicited non-immediate data received %u" 509 " does not equal FirstBurstLength: %u, and does" 510 " not equal ExpXferLen %u.\n", 511 (cmd->first_burst_len + payload_length), 512 conn->sess->sess_ops->FirstBurstLength, cmd->data_length); 513 transport_send_check_condition_and_sense(se_cmd, 514 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 515 return -1; 516 } 517 return 0; 518 } 519 520 struct iscsi_cmd *iscsit_find_cmd_from_itt( 521 struct iscsi_conn *conn, 522 u32 init_task_tag) 523 { 524 struct iscsi_cmd *cmd; 525 526 spin_lock_bh(&conn->cmd_lock); 527 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { 528 if (cmd->init_task_tag == init_task_tag) { 529 spin_unlock_bh(&conn->cmd_lock); 530 return cmd; 531 } 532 } 533 spin_unlock_bh(&conn->cmd_lock); 534 535 pr_err("Unable to locate ITT: 0x%08x on CID: %hu", 536 init_task_tag, conn->cid); 537 return NULL; 538 } 539 540 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump( 541 struct iscsi_conn *conn, 542 u32 init_task_tag, 543 u32 length) 544 { 545 struct iscsi_cmd *cmd; 546 547 spin_lock_bh(&conn->cmd_lock); 548 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { 549 if (cmd->init_task_tag == init_task_tag) { 550 spin_unlock_bh(&conn->cmd_lock); 551 return cmd; 552 } 553 } 554 spin_unlock_bh(&conn->cmd_lock); 555 556 pr_err("Unable to locate ITT: 0x%08x on CID: %hu," 557 " dumping payload\n", init_task_tag, conn->cid); 558 if (length) 559 iscsit_dump_data_payload(conn, length, 1); 560 561 return NULL; 562 } 563 564 struct iscsi_cmd *iscsit_find_cmd_from_ttt( 565 struct iscsi_conn *conn, 566 u32 targ_xfer_tag) 567 { 568 struct iscsi_cmd *cmd = NULL; 569 570 spin_lock_bh(&conn->cmd_lock); 571 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { 572 if (cmd->targ_xfer_tag == targ_xfer_tag) { 573 spin_unlock_bh(&conn->cmd_lock); 574 return cmd; 575 } 576 } 577 spin_unlock_bh(&conn->cmd_lock); 578 579 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n", 580 targ_xfer_tag, conn->cid); 581 return NULL; 582 } 583 584 int iscsit_find_cmd_for_recovery( 585 struct iscsi_session *sess, 586 struct iscsi_cmd **cmd_ptr, 587 struct iscsi_conn_recovery **cr_ptr, 588 u32 init_task_tag) 589 { 590 struct iscsi_cmd *cmd = NULL; 591 struct iscsi_conn_recovery *cr; 592 /* 593 * Scan through the inactive connection recovery list's command list. 594 * If init_task_tag matches the command is still alligent. 595 */ 596 spin_lock(&sess->cr_i_lock); 597 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { 598 spin_lock(&cr->conn_recovery_cmd_lock); 599 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) { 600 if (cmd->init_task_tag == init_task_tag) { 601 spin_unlock(&cr->conn_recovery_cmd_lock); 602 spin_unlock(&sess->cr_i_lock); 603 604 *cr_ptr = cr; 605 *cmd_ptr = cmd; 606 return -2; 607 } 608 } 609 spin_unlock(&cr->conn_recovery_cmd_lock); 610 } 611 spin_unlock(&sess->cr_i_lock); 612 /* 613 * Scan through the active connection recovery list's command list. 614 * If init_task_tag matches the command is ready to be reassigned. 615 */ 616 spin_lock(&sess->cr_a_lock); 617 list_for_each_entry(cr, &sess->cr_active_list, cr_list) { 618 spin_lock(&cr->conn_recovery_cmd_lock); 619 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) { 620 if (cmd->init_task_tag == init_task_tag) { 621 spin_unlock(&cr->conn_recovery_cmd_lock); 622 spin_unlock(&sess->cr_a_lock); 623 624 *cr_ptr = cr; 625 *cmd_ptr = cmd; 626 return 0; 627 } 628 } 629 spin_unlock(&cr->conn_recovery_cmd_lock); 630 } 631 spin_unlock(&sess->cr_a_lock); 632 633 return -1; 634 } 635 636 void iscsit_add_cmd_to_immediate_queue( 637 struct iscsi_cmd *cmd, 638 struct iscsi_conn *conn, 639 u8 state) 640 { 641 struct iscsi_queue_req *qr; 642 643 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 644 if (!qr) { 645 pr_err("Unable to allocate memory for" 646 " struct iscsi_queue_req\n"); 647 return; 648 } 649 INIT_LIST_HEAD(&qr->qr_list); 650 qr->cmd = cmd; 651 qr->state = state; 652 653 spin_lock_bh(&conn->immed_queue_lock); 654 list_add_tail(&qr->qr_list, &conn->immed_queue_list); 655 atomic_inc(&cmd->immed_queue_count); 656 atomic_set(&conn->check_immediate_queue, 1); 657 spin_unlock_bh(&conn->immed_queue_lock); 658 659 wake_up_process(conn->thread_set->tx_thread); 660 } 661 662 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn) 663 { 664 struct iscsi_queue_req *qr; 665 666 spin_lock_bh(&conn->immed_queue_lock); 667 if (list_empty(&conn->immed_queue_list)) { 668 spin_unlock_bh(&conn->immed_queue_lock); 669 return NULL; 670 } 671 list_for_each_entry(qr, &conn->immed_queue_list, qr_list) 672 break; 673 674 list_del(&qr->qr_list); 675 if (qr->cmd) 676 atomic_dec(&qr->cmd->immed_queue_count); 677 spin_unlock_bh(&conn->immed_queue_lock); 678 679 return qr; 680 } 681 682 static void iscsit_remove_cmd_from_immediate_queue( 683 struct iscsi_cmd *cmd, 684 struct iscsi_conn *conn) 685 { 686 struct iscsi_queue_req *qr, *qr_tmp; 687 688 spin_lock_bh(&conn->immed_queue_lock); 689 if (!atomic_read(&cmd->immed_queue_count)) { 690 spin_unlock_bh(&conn->immed_queue_lock); 691 return; 692 } 693 694 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 695 if (qr->cmd != cmd) 696 continue; 697 698 atomic_dec(&qr->cmd->immed_queue_count); 699 list_del(&qr->qr_list); 700 kmem_cache_free(lio_qr_cache, qr); 701 } 702 spin_unlock_bh(&conn->immed_queue_lock); 703 704 if (atomic_read(&cmd->immed_queue_count)) { 705 pr_err("ITT: 0x%08x immed_queue_count: %d\n", 706 cmd->init_task_tag, 707 atomic_read(&cmd->immed_queue_count)); 708 } 709 } 710 711 void iscsit_add_cmd_to_response_queue( 712 struct iscsi_cmd *cmd, 713 struct iscsi_conn *conn, 714 u8 state) 715 { 716 struct iscsi_queue_req *qr; 717 718 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 719 if (!qr) { 720 pr_err("Unable to allocate memory for" 721 " struct iscsi_queue_req\n"); 722 return; 723 } 724 INIT_LIST_HEAD(&qr->qr_list); 725 qr->cmd = cmd; 726 qr->state = state; 727 728 spin_lock_bh(&conn->response_queue_lock); 729 list_add_tail(&qr->qr_list, &conn->response_queue_list); 730 atomic_inc(&cmd->response_queue_count); 731 spin_unlock_bh(&conn->response_queue_lock); 732 733 wake_up_process(conn->thread_set->tx_thread); 734 } 735 736 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn) 737 { 738 struct iscsi_queue_req *qr; 739 740 spin_lock_bh(&conn->response_queue_lock); 741 if (list_empty(&conn->response_queue_list)) { 742 spin_unlock_bh(&conn->response_queue_lock); 743 return NULL; 744 } 745 746 list_for_each_entry(qr, &conn->response_queue_list, qr_list) 747 break; 748 749 list_del(&qr->qr_list); 750 if (qr->cmd) 751 atomic_dec(&qr->cmd->response_queue_count); 752 spin_unlock_bh(&conn->response_queue_lock); 753 754 return qr; 755 } 756 757 static void iscsit_remove_cmd_from_response_queue( 758 struct iscsi_cmd *cmd, 759 struct iscsi_conn *conn) 760 { 761 struct iscsi_queue_req *qr, *qr_tmp; 762 763 spin_lock_bh(&conn->response_queue_lock); 764 if (!atomic_read(&cmd->response_queue_count)) { 765 spin_unlock_bh(&conn->response_queue_lock); 766 return; 767 } 768 769 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 770 qr_list) { 771 if (qr->cmd != cmd) 772 continue; 773 774 atomic_dec(&qr->cmd->response_queue_count); 775 list_del(&qr->qr_list); 776 kmem_cache_free(lio_qr_cache, qr); 777 } 778 spin_unlock_bh(&conn->response_queue_lock); 779 780 if (atomic_read(&cmd->response_queue_count)) { 781 pr_err("ITT: 0x%08x response_queue_count: %d\n", 782 cmd->init_task_tag, 783 atomic_read(&cmd->response_queue_count)); 784 } 785 } 786 787 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn) 788 { 789 struct iscsi_queue_req *qr, *qr_tmp; 790 791 spin_lock_bh(&conn->immed_queue_lock); 792 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 793 list_del(&qr->qr_list); 794 if (qr->cmd) 795 atomic_dec(&qr->cmd->immed_queue_count); 796 797 kmem_cache_free(lio_qr_cache, qr); 798 } 799 spin_unlock_bh(&conn->immed_queue_lock); 800 801 spin_lock_bh(&conn->response_queue_lock); 802 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 803 qr_list) { 804 list_del(&qr->qr_list); 805 if (qr->cmd) 806 atomic_dec(&qr->cmd->response_queue_count); 807 808 kmem_cache_free(lio_qr_cache, qr); 809 } 810 spin_unlock_bh(&conn->response_queue_lock); 811 } 812 813 void iscsit_release_cmd(struct iscsi_cmd *cmd) 814 { 815 struct iscsi_conn *conn = cmd->conn; 816 int i; 817 818 iscsit_free_r2ts_from_list(cmd); 819 iscsit_free_all_datain_reqs(cmd); 820 821 kfree(cmd->buf_ptr); 822 kfree(cmd->pdu_list); 823 kfree(cmd->seq_list); 824 kfree(cmd->tmr_req); 825 kfree(cmd->iov_data); 826 827 for (i = 0; i < cmd->t_mem_sg_nents; i++) 828 __free_page(sg_page(&cmd->t_mem_sg[i])); 829 830 kfree(cmd->t_mem_sg); 831 832 if (conn) { 833 iscsit_remove_cmd_from_immediate_queue(cmd, conn); 834 iscsit_remove_cmd_from_response_queue(cmd, conn); 835 } 836 837 kmem_cache_free(lio_cmd_cache, cmd); 838 } 839 840 void iscsit_free_cmd(struct iscsi_cmd *cmd) 841 { 842 /* 843 * Determine if a struct se_cmd is assoicated with 844 * this struct iscsi_cmd. 845 */ 846 switch (cmd->iscsi_opcode) { 847 case ISCSI_OP_SCSI_CMD: 848 case ISCSI_OP_SCSI_TMFUNC: 849 transport_generic_free_cmd(&cmd->se_cmd, 1); 850 break; 851 case ISCSI_OP_REJECT: 852 /* 853 * Handle special case for REJECT when iscsi_add_reject*() has 854 * overwritten the original iscsi_opcode assignment, and the 855 * associated cmd->se_cmd needs to be released. 856 */ 857 if (cmd->se_cmd.se_tfo != NULL) { 858 transport_generic_free_cmd(&cmd->se_cmd, 1); 859 break; 860 } 861 /* Fall-through */ 862 default: 863 iscsit_release_cmd(cmd); 864 break; 865 } 866 } 867 868 int iscsit_check_session_usage_count(struct iscsi_session *sess) 869 { 870 spin_lock_bh(&sess->session_usage_lock); 871 if (sess->session_usage_count != 0) { 872 sess->session_waiting_on_uc = 1; 873 spin_unlock_bh(&sess->session_usage_lock); 874 if (in_interrupt()) 875 return 2; 876 877 wait_for_completion(&sess->session_waiting_on_uc_comp); 878 return 1; 879 } 880 spin_unlock_bh(&sess->session_usage_lock); 881 882 return 0; 883 } 884 885 void iscsit_dec_session_usage_count(struct iscsi_session *sess) 886 { 887 spin_lock_bh(&sess->session_usage_lock); 888 sess->session_usage_count--; 889 890 if (!sess->session_usage_count && sess->session_waiting_on_uc) 891 complete(&sess->session_waiting_on_uc_comp); 892 893 spin_unlock_bh(&sess->session_usage_lock); 894 } 895 896 void iscsit_inc_session_usage_count(struct iscsi_session *sess) 897 { 898 spin_lock_bh(&sess->session_usage_lock); 899 sess->session_usage_count++; 900 spin_unlock_bh(&sess->session_usage_lock); 901 } 902 903 /* 904 * Setup conn->if_marker and conn->of_marker values based upon 905 * the initial marker-less interval. (see iSCSI v19 A.2) 906 */ 907 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn) 908 { 909 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0; 910 /* 911 * IFMarkInt and OFMarkInt are negotiated as 32-bit words. 912 */ 913 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4); 914 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4); 915 916 if (conn->conn_ops->OFMarker) { 917 /* 918 * Account for the first Login Command received not 919 * via iscsi_recv_msg(). 920 */ 921 conn->of_marker += ISCSI_HDR_LEN; 922 if (conn->of_marker <= OFMarkInt) { 923 conn->of_marker = (OFMarkInt - conn->of_marker); 924 } else { 925 login_ofmarker_count = (conn->of_marker / OFMarkInt); 926 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) + 927 (login_ofmarker_count * MARKER_SIZE); 928 conn->of_marker = (next_marker - conn->of_marker); 929 } 930 conn->of_marker_offset = 0; 931 pr_debug("Setting OFMarker value to %u based on Initial" 932 " Markerless Interval.\n", conn->of_marker); 933 } 934 935 if (conn->conn_ops->IFMarker) { 936 if (conn->if_marker <= IFMarkInt) { 937 conn->if_marker = (IFMarkInt - conn->if_marker); 938 } else { 939 login_ifmarker_count = (conn->if_marker / IFMarkInt); 940 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) + 941 (login_ifmarker_count * MARKER_SIZE); 942 conn->if_marker = (next_marker - conn->if_marker); 943 } 944 pr_debug("Setting IFMarker value to %u based on Initial" 945 " Markerless Interval.\n", conn->if_marker); 946 } 947 948 return 0; 949 } 950 951 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid) 952 { 953 struct iscsi_conn *conn; 954 955 spin_lock_bh(&sess->conn_lock); 956 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 957 if ((conn->cid == cid) && 958 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) { 959 iscsit_inc_conn_usage_count(conn); 960 spin_unlock_bh(&sess->conn_lock); 961 return conn; 962 } 963 } 964 spin_unlock_bh(&sess->conn_lock); 965 966 return NULL; 967 } 968 969 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid) 970 { 971 struct iscsi_conn *conn; 972 973 spin_lock_bh(&sess->conn_lock); 974 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 975 if (conn->cid == cid) { 976 iscsit_inc_conn_usage_count(conn); 977 spin_lock(&conn->state_lock); 978 atomic_set(&conn->connection_wait_rcfr, 1); 979 spin_unlock(&conn->state_lock); 980 spin_unlock_bh(&sess->conn_lock); 981 return conn; 982 } 983 } 984 spin_unlock_bh(&sess->conn_lock); 985 986 return NULL; 987 } 988 989 void iscsit_check_conn_usage_count(struct iscsi_conn *conn) 990 { 991 spin_lock_bh(&conn->conn_usage_lock); 992 if (conn->conn_usage_count != 0) { 993 conn->conn_waiting_on_uc = 1; 994 spin_unlock_bh(&conn->conn_usage_lock); 995 996 wait_for_completion(&conn->conn_waiting_on_uc_comp); 997 return; 998 } 999 spin_unlock_bh(&conn->conn_usage_lock); 1000 } 1001 1002 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn) 1003 { 1004 spin_lock_bh(&conn->conn_usage_lock); 1005 conn->conn_usage_count--; 1006 1007 if (!conn->conn_usage_count && conn->conn_waiting_on_uc) 1008 complete(&conn->conn_waiting_on_uc_comp); 1009 1010 spin_unlock_bh(&conn->conn_usage_lock); 1011 } 1012 1013 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn) 1014 { 1015 spin_lock_bh(&conn->conn_usage_lock); 1016 conn->conn_usage_count++; 1017 spin_unlock_bh(&conn->conn_usage_lock); 1018 } 1019 1020 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response) 1021 { 1022 u8 state; 1023 struct iscsi_cmd *cmd; 1024 1025 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC); 1026 if (!cmd) 1027 return -1; 1028 1029 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN; 1030 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE : 1031 ISTATE_SEND_NOPIN_NO_RESPONSE; 1032 cmd->init_task_tag = 0xFFFFFFFF; 1033 spin_lock_bh(&conn->sess->ttt_lock); 1034 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ : 1035 0xFFFFFFFF; 1036 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF)) 1037 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 1038 spin_unlock_bh(&conn->sess->ttt_lock); 1039 1040 spin_lock_bh(&conn->cmd_lock); 1041 list_add_tail(&cmd->i_list, &conn->conn_cmd_list); 1042 spin_unlock_bh(&conn->cmd_lock); 1043 1044 if (want_response) 1045 iscsit_start_nopin_response_timer(conn); 1046 iscsit_add_cmd_to_immediate_queue(cmd, conn, state); 1047 1048 return 0; 1049 } 1050 1051 static void iscsit_handle_nopin_response_timeout(unsigned long data) 1052 { 1053 struct iscsi_conn *conn = (struct iscsi_conn *) data; 1054 1055 iscsit_inc_conn_usage_count(conn); 1056 1057 spin_lock_bh(&conn->nopin_timer_lock); 1058 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) { 1059 spin_unlock_bh(&conn->nopin_timer_lock); 1060 iscsit_dec_conn_usage_count(conn); 1061 return; 1062 } 1063 1064 pr_debug("Did not receive response to NOPIN on CID: %hu on" 1065 " SID: %u, failing connection.\n", conn->cid, 1066 conn->sess->sid); 1067 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 1068 spin_unlock_bh(&conn->nopin_timer_lock); 1069 1070 { 1071 struct iscsi_portal_group *tpg = conn->sess->tpg; 1072 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 1073 1074 if (tiqn) { 1075 spin_lock_bh(&tiqn->sess_err_stats.lock); 1076 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, 1077 conn->sess->sess_ops->InitiatorName); 1078 tiqn->sess_err_stats.last_sess_failure_type = 1079 ISCSI_SESS_ERR_CXN_TIMEOUT; 1080 tiqn->sess_err_stats.cxn_timeout_errors++; 1081 conn->sess->conn_timeout_errors++; 1082 spin_unlock_bh(&tiqn->sess_err_stats.lock); 1083 } 1084 } 1085 1086 iscsit_cause_connection_reinstatement(conn, 0); 1087 iscsit_dec_conn_usage_count(conn); 1088 } 1089 1090 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn) 1091 { 1092 struct iscsi_session *sess = conn->sess; 1093 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1094 1095 spin_lock_bh(&conn->nopin_timer_lock); 1096 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 1097 spin_unlock_bh(&conn->nopin_timer_lock); 1098 return; 1099 } 1100 1101 mod_timer(&conn->nopin_response_timer, 1102 (get_jiffies_64() + na->nopin_response_timeout * HZ)); 1103 spin_unlock_bh(&conn->nopin_timer_lock); 1104 } 1105 1106 /* 1107 * Called with conn->nopin_timer_lock held. 1108 */ 1109 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn) 1110 { 1111 struct iscsi_session *sess = conn->sess; 1112 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1113 1114 spin_lock_bh(&conn->nopin_timer_lock); 1115 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) { 1116 spin_unlock_bh(&conn->nopin_timer_lock); 1117 return; 1118 } 1119 1120 init_timer(&conn->nopin_response_timer); 1121 conn->nopin_response_timer.expires = 1122 (get_jiffies_64() + na->nopin_response_timeout * HZ); 1123 conn->nopin_response_timer.data = (unsigned long)conn; 1124 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout; 1125 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; 1126 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; 1127 add_timer(&conn->nopin_response_timer); 1128 1129 pr_debug("Started NOPIN Response Timer on CID: %d to %u" 1130 " seconds\n", conn->cid, na->nopin_response_timeout); 1131 spin_unlock_bh(&conn->nopin_timer_lock); 1132 } 1133 1134 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn) 1135 { 1136 spin_lock_bh(&conn->nopin_timer_lock); 1137 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 1138 spin_unlock_bh(&conn->nopin_timer_lock); 1139 return; 1140 } 1141 conn->nopin_response_timer_flags |= ISCSI_TF_STOP; 1142 spin_unlock_bh(&conn->nopin_timer_lock); 1143 1144 del_timer_sync(&conn->nopin_response_timer); 1145 1146 spin_lock_bh(&conn->nopin_timer_lock); 1147 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 1148 spin_unlock_bh(&conn->nopin_timer_lock); 1149 } 1150 1151 static void iscsit_handle_nopin_timeout(unsigned long data) 1152 { 1153 struct iscsi_conn *conn = (struct iscsi_conn *) data; 1154 1155 iscsit_inc_conn_usage_count(conn); 1156 1157 spin_lock_bh(&conn->nopin_timer_lock); 1158 if (conn->nopin_timer_flags & ISCSI_TF_STOP) { 1159 spin_unlock_bh(&conn->nopin_timer_lock); 1160 iscsit_dec_conn_usage_count(conn); 1161 return; 1162 } 1163 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1164 spin_unlock_bh(&conn->nopin_timer_lock); 1165 1166 iscsit_add_nopin(conn, 1); 1167 iscsit_dec_conn_usage_count(conn); 1168 } 1169 1170 /* 1171 * Called with conn->nopin_timer_lock held. 1172 */ 1173 void __iscsit_start_nopin_timer(struct iscsi_conn *conn) 1174 { 1175 struct iscsi_session *sess = conn->sess; 1176 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1177 /* 1178 * NOPIN timeout is disabled. 1179 */ 1180 if (!na->nopin_timeout) 1181 return; 1182 1183 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) 1184 return; 1185 1186 init_timer(&conn->nopin_timer); 1187 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1188 conn->nopin_timer.data = (unsigned long)conn; 1189 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1190 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1191 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1192 add_timer(&conn->nopin_timer); 1193 1194 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1195 " interval\n", conn->cid, na->nopin_timeout); 1196 } 1197 1198 void iscsit_start_nopin_timer(struct iscsi_conn *conn) 1199 { 1200 struct iscsi_session *sess = conn->sess; 1201 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1202 /* 1203 * NOPIN timeout is disabled.. 1204 */ 1205 if (!na->nopin_timeout) 1206 return; 1207 1208 spin_lock_bh(&conn->nopin_timer_lock); 1209 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) { 1210 spin_unlock_bh(&conn->nopin_timer_lock); 1211 return; 1212 } 1213 1214 init_timer(&conn->nopin_timer); 1215 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1216 conn->nopin_timer.data = (unsigned long)conn; 1217 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1218 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1219 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1220 add_timer(&conn->nopin_timer); 1221 1222 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1223 " interval\n", conn->cid, na->nopin_timeout); 1224 spin_unlock_bh(&conn->nopin_timer_lock); 1225 } 1226 1227 void iscsit_stop_nopin_timer(struct iscsi_conn *conn) 1228 { 1229 spin_lock_bh(&conn->nopin_timer_lock); 1230 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) { 1231 spin_unlock_bh(&conn->nopin_timer_lock); 1232 return; 1233 } 1234 conn->nopin_timer_flags |= ISCSI_TF_STOP; 1235 spin_unlock_bh(&conn->nopin_timer_lock); 1236 1237 del_timer_sync(&conn->nopin_timer); 1238 1239 spin_lock_bh(&conn->nopin_timer_lock); 1240 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1241 spin_unlock_bh(&conn->nopin_timer_lock); 1242 } 1243 1244 int iscsit_send_tx_data( 1245 struct iscsi_cmd *cmd, 1246 struct iscsi_conn *conn, 1247 int use_misc) 1248 { 1249 int tx_sent, tx_size; 1250 u32 iov_count; 1251 struct kvec *iov; 1252 1253 send_data: 1254 tx_size = cmd->tx_size; 1255 1256 if (!use_misc) { 1257 iov = &cmd->iov_data[0]; 1258 iov_count = cmd->iov_data_count; 1259 } else { 1260 iov = &cmd->iov_misc[0]; 1261 iov_count = cmd->iov_misc_count; 1262 } 1263 1264 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size); 1265 if (tx_size != tx_sent) { 1266 if (tx_sent == -EAGAIN) { 1267 pr_err("tx_data() returned -EAGAIN\n"); 1268 goto send_data; 1269 } else 1270 return -1; 1271 } 1272 cmd->tx_size = 0; 1273 1274 return 0; 1275 } 1276 1277 int iscsit_fe_sendpage_sg( 1278 struct iscsi_cmd *cmd, 1279 struct iscsi_conn *conn) 1280 { 1281 struct scatterlist *sg = cmd->first_data_sg; 1282 struct kvec iov; 1283 u32 tx_hdr_size, data_len; 1284 u32 offset = cmd->first_data_sg_off; 1285 int tx_sent, iov_off; 1286 1287 send_hdr: 1288 tx_hdr_size = ISCSI_HDR_LEN; 1289 if (conn->conn_ops->HeaderDigest) 1290 tx_hdr_size += ISCSI_CRC_LEN; 1291 1292 iov.iov_base = cmd->pdu; 1293 iov.iov_len = tx_hdr_size; 1294 1295 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size); 1296 if (tx_hdr_size != tx_sent) { 1297 if (tx_sent == -EAGAIN) { 1298 pr_err("tx_data() returned -EAGAIN\n"); 1299 goto send_hdr; 1300 } 1301 return -1; 1302 } 1303 1304 data_len = cmd->tx_size - tx_hdr_size - cmd->padding; 1305 /* 1306 * Set iov_off used by padding and data digest tx_data() calls below 1307 * in order to determine proper offset into cmd->iov_data[] 1308 */ 1309 if (conn->conn_ops->DataDigest) { 1310 data_len -= ISCSI_CRC_LEN; 1311 if (cmd->padding) 1312 iov_off = (cmd->iov_data_count - 2); 1313 else 1314 iov_off = (cmd->iov_data_count - 1); 1315 } else { 1316 iov_off = (cmd->iov_data_count - 1); 1317 } 1318 /* 1319 * Perform sendpage() for each page in the scatterlist 1320 */ 1321 while (data_len) { 1322 u32 space = (sg->length - offset); 1323 u32 sub_len = min_t(u32, data_len, space); 1324 send_pg: 1325 tx_sent = conn->sock->ops->sendpage(conn->sock, 1326 sg_page(sg), sg->offset + offset, sub_len, 0); 1327 if (tx_sent != sub_len) { 1328 if (tx_sent == -EAGAIN) { 1329 pr_err("tcp_sendpage() returned" 1330 " -EAGAIN\n"); 1331 goto send_pg; 1332 } 1333 1334 pr_err("tcp_sendpage() failure: %d\n", 1335 tx_sent); 1336 return -1; 1337 } 1338 1339 data_len -= sub_len; 1340 offset = 0; 1341 sg = sg_next(sg); 1342 } 1343 1344 send_padding: 1345 if (cmd->padding) { 1346 struct kvec *iov_p = &cmd->iov_data[iov_off++]; 1347 1348 tx_sent = tx_data(conn, iov_p, 1, cmd->padding); 1349 if (cmd->padding != tx_sent) { 1350 if (tx_sent == -EAGAIN) { 1351 pr_err("tx_data() returned -EAGAIN\n"); 1352 goto send_padding; 1353 } 1354 return -1; 1355 } 1356 } 1357 1358 send_datacrc: 1359 if (conn->conn_ops->DataDigest) { 1360 struct kvec *iov_d = &cmd->iov_data[iov_off]; 1361 1362 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN); 1363 if (ISCSI_CRC_LEN != tx_sent) { 1364 if (tx_sent == -EAGAIN) { 1365 pr_err("tx_data() returned -EAGAIN\n"); 1366 goto send_datacrc; 1367 } 1368 return -1; 1369 } 1370 } 1371 1372 return 0; 1373 } 1374 1375 /* 1376 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU 1377 * back to the Initiator when an expection condition occurs with the 1378 * errors set in status_class and status_detail. 1379 * 1380 * Parameters: iSCSI Connection, Status Class, Status Detail. 1381 * Returns: 0 on success, -1 on error. 1382 */ 1383 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail) 1384 { 1385 u8 iscsi_hdr[ISCSI_HDR_LEN]; 1386 int err; 1387 struct kvec iov; 1388 struct iscsi_login_rsp *hdr; 1389 1390 iscsit_collect_login_stats(conn, status_class, status_detail); 1391 1392 memset(&iov, 0, sizeof(struct kvec)); 1393 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN); 1394 1395 hdr = (struct iscsi_login_rsp *)&iscsi_hdr; 1396 hdr->opcode = ISCSI_OP_LOGIN_RSP; 1397 hdr->status_class = status_class; 1398 hdr->status_detail = status_detail; 1399 hdr->itt = cpu_to_be32(conn->login_itt); 1400 1401 iov.iov_base = &iscsi_hdr; 1402 iov.iov_len = ISCSI_HDR_LEN; 1403 1404 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN); 1405 1406 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN); 1407 if (err != ISCSI_HDR_LEN) { 1408 pr_err("tx_data returned less than expected\n"); 1409 return -1; 1410 } 1411 1412 return 0; 1413 } 1414 1415 void iscsit_print_session_params(struct iscsi_session *sess) 1416 { 1417 struct iscsi_conn *conn; 1418 1419 pr_debug("-----------------------------[Session Params for" 1420 " SID: %u]-----------------------------\n", sess->sid); 1421 spin_lock_bh(&sess->conn_lock); 1422 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 1423 iscsi_dump_conn_ops(conn->conn_ops); 1424 spin_unlock_bh(&sess->conn_lock); 1425 1426 iscsi_dump_sess_ops(sess->sess_ops); 1427 } 1428 1429 static int iscsit_do_rx_data( 1430 struct iscsi_conn *conn, 1431 struct iscsi_data_count *count) 1432 { 1433 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len; 1434 struct kvec *iov_p; 1435 struct msghdr msg; 1436 1437 if (!conn || !conn->sock || !conn->conn_ops) 1438 return -1; 1439 1440 memset(&msg, 0, sizeof(struct msghdr)); 1441 1442 iov_p = count->iov; 1443 iov_len = count->iov_count; 1444 1445 while (total_rx < data) { 1446 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len, 1447 (data - total_rx), MSG_WAITALL); 1448 if (rx_loop <= 0) { 1449 pr_debug("rx_loop: %d total_rx: %d\n", 1450 rx_loop, total_rx); 1451 return rx_loop; 1452 } 1453 total_rx += rx_loop; 1454 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n", 1455 rx_loop, total_rx, data); 1456 } 1457 1458 return total_rx; 1459 } 1460 1461 static int iscsit_do_tx_data( 1462 struct iscsi_conn *conn, 1463 struct iscsi_data_count *count) 1464 { 1465 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len; 1466 struct kvec *iov_p; 1467 struct msghdr msg; 1468 1469 if (!conn || !conn->sock || !conn->conn_ops) 1470 return -1; 1471 1472 if (data <= 0) { 1473 pr_err("Data length is: %d\n", data); 1474 return -1; 1475 } 1476 1477 memset(&msg, 0, sizeof(struct msghdr)); 1478 1479 iov_p = count->iov; 1480 iov_len = count->iov_count; 1481 1482 while (total_tx < data) { 1483 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len, 1484 (data - total_tx)); 1485 if (tx_loop <= 0) { 1486 pr_debug("tx_loop: %d total_tx %d\n", 1487 tx_loop, total_tx); 1488 return tx_loop; 1489 } 1490 total_tx += tx_loop; 1491 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n", 1492 tx_loop, total_tx, data); 1493 } 1494 1495 return total_tx; 1496 } 1497 1498 int rx_data( 1499 struct iscsi_conn *conn, 1500 struct kvec *iov, 1501 int iov_count, 1502 int data) 1503 { 1504 struct iscsi_data_count c; 1505 1506 if (!conn || !conn->sock || !conn->conn_ops) 1507 return -1; 1508 1509 memset(&c, 0, sizeof(struct iscsi_data_count)); 1510 c.iov = iov; 1511 c.iov_count = iov_count; 1512 c.data_length = data; 1513 c.type = ISCSI_RX_DATA; 1514 1515 return iscsit_do_rx_data(conn, &c); 1516 } 1517 1518 int tx_data( 1519 struct iscsi_conn *conn, 1520 struct kvec *iov, 1521 int iov_count, 1522 int data) 1523 { 1524 struct iscsi_data_count c; 1525 1526 if (!conn || !conn->sock || !conn->conn_ops) 1527 return -1; 1528 1529 memset(&c, 0, sizeof(struct iscsi_data_count)); 1530 c.iov = iov; 1531 c.iov_count = iov_count; 1532 c.data_length = data; 1533 c.type = ISCSI_TX_DATA; 1534 1535 return iscsit_do_tx_data(conn, &c); 1536 } 1537 1538 void iscsit_collect_login_stats( 1539 struct iscsi_conn *conn, 1540 u8 status_class, 1541 u8 status_detail) 1542 { 1543 struct iscsi_param *intrname = NULL; 1544 struct iscsi_tiqn *tiqn; 1545 struct iscsi_login_stats *ls; 1546 1547 tiqn = iscsit_snmp_get_tiqn(conn); 1548 if (!tiqn) 1549 return; 1550 1551 ls = &tiqn->login_stats; 1552 1553 spin_lock(&ls->lock); 1554 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) && 1555 ((get_jiffies_64() - ls->last_fail_time) < 10)) { 1556 /* We already have the failure info for this login */ 1557 spin_unlock(&ls->lock); 1558 return; 1559 } 1560 1561 if (status_class == ISCSI_STATUS_CLS_SUCCESS) 1562 ls->accepts++; 1563 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) { 1564 ls->redirects++; 1565 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT; 1566 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1567 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) { 1568 ls->authenticate_fails++; 1569 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE; 1570 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1571 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) { 1572 ls->authorize_fails++; 1573 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE; 1574 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1575 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) { 1576 ls->negotiate_fails++; 1577 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE; 1578 } else { 1579 ls->other_fails++; 1580 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER; 1581 } 1582 1583 /* Save initiator name, ip address and time, if it is a failed login */ 1584 if (status_class != ISCSI_STATUS_CLS_SUCCESS) { 1585 if (conn->param_list) 1586 intrname = iscsi_find_param_from_key(INITIATORNAME, 1587 conn->param_list); 1588 strcpy(ls->last_intr_fail_name, 1589 (intrname ? intrname->value : "Unknown")); 1590 1591 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family; 1592 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE, 1593 "%s", conn->login_ip); 1594 ls->last_fail_time = get_jiffies_64(); 1595 } 1596 1597 spin_unlock(&ls->lock); 1598 } 1599 1600 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn) 1601 { 1602 struct iscsi_portal_group *tpg; 1603 1604 if (!conn || !conn->sess) 1605 return NULL; 1606 1607 tpg = conn->sess->tpg; 1608 if (!tpg) 1609 return NULL; 1610 1611 if (!tpg->tpg_tiqn) 1612 return NULL; 1613 1614 return tpg->tpg_tiqn; 1615 } 1616