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